A stage circuit including an output unit for supplying first or second power source to an output terminal is disclosed. The stage circuit may comprise a bidirectional driver for respectively supplying signals supplied to first and second input terminals, a first driver, and a second driver. The second driver controls the output unit to output the second power source to the output terminal without any voltage loss, corresponding to a second clock signal.

A bridge output circuit includes an output terminal, a high side transistor, a low side transistor, a high side driver for controlling a gate voltage of the high side transistor, a low side driver for controlling a gate voltage of the low side transistor, and a controller for controlling the high side and low side drivers. The low side driver includes a first current source, a second current source, and a first assist circuit. The controller is configured to control the turning-on and turning-off states of the first current source, the second current source and the first assist circuit.

The present invention relates to a method for downloading a binary configuration file in a programmable circuit implemented in a device. The device comprises at least one central processing unit, a plurality of connectors, and a programmable circuit enabling all or a part of the signals received by said connectors to be processed and transmitted to at least one other circuit of the device. The device analyzes the signals present on the connectors in order to define what other devices are connected and whether the connections are operational. Then, a configuration file is selected from among a set of configuration files according to the operational connections and is downloaded from a memory of the device into the programmable circuit. The invention also relates to a device having a component programmed according to the method previously described.

Embodiments of the invention are generally directed to a single-ended configurable multi-mode driver. An embodiment of an apparatus includes an input to receive an input signal, an output to transmit a driven signal generated from the input signal on a communication channel, a mechanism for independently configuring a termination resistance of the driver apparatus, and a mechanism for independently configuring a voltage swing of the driven signal without modifying a supply voltage for the apparatus.

A circuit for a single differential-inductor oscillator with common-mode resonance may include a tank circuit formed by coupling a first inductor with a pair of first capacitors; a cross-coupled transistor pair coupled to the tank circuit; and one or more second capacitors coupled to the tank circuit and the cross-coupled transistors. The single differential-inductor oscillator may be configured such that a common mode (CM) resonance frequency (FCM) associated with the single differential-inductor oscillator is at twice a differential resonance frequency (FD) associated with the single differential-inductor oscillator.

The invention concerns an oscillator generating a wave composed of a frequency of on the order of terahertz from a beat of two optical waves generated by a dual-frequency optical source. The oscillator includes a modulator the transfer function of which is non-linear for generating harmonics with a frequency of less than one terahertz for each of the optical waves generated by the dual-frequency optical source, an optical detector able to detect at least one harmonic for each of the optical waves generated by the dual-frequency optical source and transforming the harmonics detected into an electrical signal, a phase comparator for comparing the electrical signal with a reference electrical signal, and a module for controlling at least one element of the dual-frequency optical source with a signal obtained from the signal resulting from the comparison.

The present invention proposes a digital system and method of measuring (estimating) non-energy parameters of the signal (phase, frequency and frequency rate) received in additive mixture with Gaussian noise. The first embodiment of the measuring system consists of a PLL system tracking variable signal frequency, a block of NCO full phase computation (OFPC), a block of signal phase primary estimation (SPPE) and a first type adaptive filter filtering the signal from the output of SPPE. The second embodiment of the invention has no block SPPE, and NCO full phase is fed to the input of a second type adaptive filter. The present invention can be used in receivers of various navigation systems, such as GPS, GLONASS and GALILEO, which provide precise measurements of signal phase at different rates of frequency change, as well as systems using digital PLLs for speed measurements.

A method, an apparatus, and a computer program product are provided. The apparatus tunes a frequency provided by a VCO. The apparatus determines a relative capacitance change associated with a first frequency and a desired frequency from a look-up table. The apparatus adjusts a capacitor circuit in the VCO based on the determined relative capacitance change determined from the look-up table in order to tune from the first frequency to the desired frequency. The apparatus determines that the frequency provided by the VCO is a second frequency different than the desired frequency after adjusting the capacitor circuit. The apparatus performs an iterative search to further adjust the capacitor circuit when a difference between the second frequency and the desired frequency is greater than a threshold.

The invention provides a switching valve having a valve element which is movable in a housing, an actuating apparatus acting on the valve element in a first direction and a spring apparatus charging the valve element in a second direction. According to the invention, the first and second directions are in opposition and the spring apparatus has a progressive spring characteristic.

In a processing machine including a processor having a processing blade and a receiver having a reception member and in which a blade edge of the processing blade and a reception portion, of the reception member, engage with each other to process a paper sheet therebetween, the processing blade is one processing blade selected from a blade group and is attached to the processor so as to be changeable to another processing blade of the blade group, reception portions of kinds corresponding to a plurality of kinds of the processing blades of the blade group are formed on the reception member, and the processing blade attached to the processor is positioned so as to be in a position where the blade edge is engageable with the reception portion of the corresponding kind.

A method for operating a processing system, in which product units of different formats are processed. The processing system contains a plurality of processing devices that are arranged one after the other in a processing line. In the event of a format changeover, certain component arrangements arranged in the processing system must be adapted to the new product format. In the event of an upcoming format change, a gap in the conveyed goods is generated while the conveying operation is maintained, wherein the gap in the conveyed goods runs through the processing system along the processing devices. As soon as the gap in the conveyed goods runs through a component arrangement to be adapted to the new format, the format is changed over at the component arrangement while the gap in the conveyed goods runs through the component arrangement.

The invention proposes a method for producing a printed product, in which a printed product, preferably produced in a forme-bound high-capacity printing process, in the form of a main product (2) or a subproduct is provided with an identification means which comprises a piece of individualizable product-specific information. At least two downstream individualization steps are performed, wherein the identification means allow the piece of information which is to be added in the at least two further downstream individualization steps to be associated with the respective product. Preferably, the new addressee-specific digital printed product comprises blog articles, preferably in the form of a blog insert, which is in turn preferably produced using digital printing. Identification means, for example in the form of ID tags (4, 4'), comprise not only the product-specific identification information but preferably also control information (31-36) which can be read by sensors on the handling devices (7-12) and hence directly control the handling of the respective product by this at least one handling device (7-12) and, in cooperation with inspection codes on the subproducts to be supplied, allow the correct supply to be inspected. The present invention also allows uninterrupted compilation of product packages for postal dispatch by virtue of the product sequence in the course of the conveying line comprising, at least in sections, a recurring succession of a respective one or more intermediate products partly individualized on an addressee-specific basis and at least one, preferably a plurality of, non-individualized standard intermediate products.

A sheet processing apparatus which is capable of completing a bound document containing appropriately Z-folded sheets when performing folding together with edge cutting and binding. The sheet processing apparatus controls a Z-folding process, a cutting process, and a binding process for a sheet. A first folding position from a free end of the sheet coincides with a position corresponding to half a width of the sheet excluding a cut width of the sheet a binding margin, when the Z-folding process, the cutting process, and the binding process are executed.

The post-processing device includes: a binding unit that forms a cut in a sheet stack and cuts a part of the sheet stack into a predetermined shape to form a tongue portion in the sheet stack, the tongue portion having a part where one end part of the tongue portion is not separated from the sheet stack, and binds the sheet stack by bending the tongue portion and inserting the other end part of the tongue portion into the cut; and a sheet stack transport unit that transports the sheet stack in an orientation such that the one end part of the tongue portion in the sheet stack bound by the binding unit is on a downstream side of the other end part of the tongue portion in the sheet stack transport direction.

A sheet processing apparatus 3 includes a position aligning section (61A, 61B), a holding section 53, and a processing section (38, 55). The position aligning section (61A, 61B) abuts the inner side or a fold of a sheet bundle (S2), which is formed by collecting a plurality of folded sheets (S1), to align the position of the folds of line plurality of folded sheets (S1). The holding section (53) holds the sheet bundle (S2) in which the position of the folds of the plurality of sheets (S1) has been aligned by the position aligning section (61A, 61B). The processing section (38, 55) performs a predetermined process on the sheet bundle (S2) held by the holding section 53.

According to an embodiment, there is provided a sheet processing apparatus includes a stacking unit that stacks a sheet conveyed thereto; a first alignment unit that aligns the sheet or a bundle of sheets stacked in the stacking unit in a sheet conveying direction; a second alignment unit that aligns the sheet or the bundle of sheets stacked in the stacking unit in a direction orthogonal to the sheet conveying direction; a pressing unit that presses the bundle of sheets at an end portion thereof on a predetermined one side; and a control unit that causes at least one of the first and second alignment units to execute an alignment operation during a press operation of the sheet or the bundle of sheets performed by the pressing unit.

A sheet processing device includes a clamp configured to clamp an edge portion of a sheet, the edge portion being on a side of an edge parallel to a direction in which the sheet has been conveyed; a first processing unit configured to perform a first process on the sheet at the side of the edge, the first processing unit being disposed at a first position; a second processing unit configured to perform a second process on the sheet at the side of the edge, the second processing unit being disposed at a second position that is different from the first position in a vertical direction; and a moving unit configured to move the clamp from the first position to the second position or vice versa so that the clamp moves on a loop passing through the first position and the second position.

A creasing device forms a crease in a to-be-folded portion of a sheet. The creasing device includes a sheet-information reading unit that reads any one of sheet information and binding information; a determining unit that determines a surface, on which the crease is to be formed, of the sheet according to the one of the sheet information and the binding information read by the sheet-information reading unit; and a creasing unit that forms the crease on the surface determined by the determining unit.

According to one embodiment, a sheet post-processing apparatus includes a machine body, a first roller pair, a tray, a second roller pair, a driving unit, an inlet sensor, a receiving unit and a control unit. The inlet sensor is configured to detect presence or absence of the sheet in the first roller pair driven by the driving unit. The receiving unit is configured to receive, from an image forming apparatus, sheet length information in the sheet conveying direction of the sheet as a target to which the print job is applied. The control unit is configured to control the driving unit to rotate, if the sheet length information indicates special length and the inlet sensor detects a trailing end of the sheet, at least rollers of the second roller pair a predetermined number of times and stop the rollers, the second roller pair nipping the sheet.

A sheet binding apparatus which forms concavity and the convexity on a sheet bundle including a plurality of sheets in a thickness direction so as to bind the sheet bundle, the sheet binding apparatus includes: a pair of concave-convex members, each of which has concave-convex portion in the thickness direction of the sheet bundle and which forms the concavity and the convexity on the sheet bundle in the thickness direction while niping the sheet bundle therebetween; wherein in the pair of concave-convex members, one of the concave-convex members has a greater difference in height of the concave-convex portion than that of the other concave-convex member which engages with the above-described concave-convex member.

The present invention is directed to providing a mechanism for allowing a user to easily take out print products discharged onto a plurality of sheet discharge trays in the discharge order. A control method for controlling a sheet processing apparatus for performing control to discharge sheets onto a plurality of sheet discharge trays includes storing, in a storage unit, the discharge order in which sheets have been discharged onto equal to or more than two sheet discharge trays by executing a job, and performing, upon reception of a take-out instruction for taking out in the discharge order the sheets discharged by executing the job, processing for allowing a user to take out the sheets discharged onto the equal to or more than two sheet discharge trays, in the discharge order stored in the storage unit.

A sheet processing apparatus includes a pair of squeezing members having a projection and a recess to engage each other, to squeeze a sheet bundle inserted therebetween in a direction of thickness of the sheet bundle, and a pressure applying unit to apply pressing force to the squeezing members to squeeze and bind the sheet bundle. The pressing force generated between the squeezing members by the pressure applying unit increases in strength as a relative distance between the squeezing members decreases.

A post-processing apparatus includes a processing tray, a conveyance portion, a staple unit, an operation portion, a mode switching portion, a cover, and an open/close detection portion. The staple unit, which has an automatic mode and a manual mode as processing modes for stapling processing, executes stapling processing for a paper sheet conveyed to the processing tray by the conveyance portion in the automatic mode, and executes stapling processing for a paper sheet stacked on the processing tray by a user in the manual mode. The cover is attached in an openable and closable manner so as to cover the operation portion when closed, and expose the operation portion when opened. While the open/close detection portion is detecting that the cover is opened, when the operation portion has received an operation for switching to the manual mode, the mode switching portion switches the automatic mode to the manual mode.

In a provided apparatus, an upper roller to be engaged with a sheet upper face and a lower roller to be engaged with a sheet lower face are arranged at a sheet discharging port in a manner capable of being pressure-contacted and being separated, the upper roller is formed with a large-diameter soft roll face and a small-diameter hard roll face, and a pressurization force of roller lifting-lowering means with which the upper roller is pressure-contacted to and is separated from the lower roller is switched to be high or low.

In a sheet storing apparatus of the present invention, a tailing end supporting member which temporarily supports a tailing end of a dropping sheet bundle is arranged between a discharging port of a processing tray to discharge the sheet bundle and the upmost sheet on a stack tray as being movable between an operating position above a sheet placement face and a waiting position outside the stack tray.

A sheet processing apparatus includes a projection forming unit configured to form a projection on a sheet. The projection is formed in the vicinity of a binding portion of a sheet bundle. When a succeeding sheet bundle is discharged on the sheet bundle in which the projection has been formed on a top surface thereof, the succeeding sheet bundle is stacked by moving on the already stacked sheet bundle without being caught by the binding portion of the already stacked sheet bundle as an end of the succeeding sheet bundle is guided by the projection.

A sheet processing apparatus and a method of controlling the same align sheets stacked on a stacking unit, by causing a first alignment member and a second alignment member to come into contact with edges of a sheet stacked on the stacking unit in a sheet width direction. In a case that a second sheet that is different from a first sheet stacked on the stacking unit is to be stacked on the first sheet and aligned using the first alignment member and the second alignment member, control is performed to discharge a partition sheet onto the first sheet stacked on the stacking unit.

A sheet processing apparatus including a stacking tray that stacks sheets, a conveying member that conveys a sheet to the stacking tray and discharges the sheet bundle from the stacking tray, wherein the conveying member includes a conveying roller and a conveying belt stretched by a plurality of stretch rollers, and a sheet processor that performs predetermined processing to the sheet bundle. When the conveying member conveys the sheet to the stacking tray, a part of the conveying belt that is not wound on the stretch roller contacts the conveying roller by moving the conveying belt as such a nip for conveying the sheet is formed. When the conveying member discharges the sheet bundle from the stacking tray, a part of the conveying belt that is wound on the stretch roller contacts the conveying roller by moving the conveying belt so that a nip for conveying the sheet is formed.

A sheet processing apparatus includes: a folding processing unit that folds a sheet by reversely rotating a second conveying member in a condition in which the sheet is held by a first and the second conveying members; a calculating unit that calculates an amount of deflection of the sheet held by the first and second conveying members from timings at which the sheet is detected by first and second detecting units disposed upstream of the first conveying member and downstream of the second conveying member and a distance between disposed positions of the first and second detecting units; and a control unit that sets, from the calculated amount of deflection of the sheet, an amount of conveyance for the first conveying member in a direction opposite to a sheet conveying direction in a condition in which the sheet is held by the first and second conveying members.

A mechanism capable of changing an upper limit number of sheets for a post-process is provided. To achieve this, a control method for controlling a sheet processing apparatus which performs the post-process for the sheets on which images are formed, comprising: storing, in a storage unit, the upper limit number of sheets to which the post-process can be performed; and changing the upper limit number of sheets stored in the storage unit is provided.

To provide a sheet storage apparatus for enabling sheets that are carried out of an image formation apparatus or the like on the upstream side to be loaded and stored in a predetermined position with a correct posture neatly at high speed, a sheet discharge roller and a reverse roller spaced a distance are disposed in a sheet discharge outlet and a tray, a kick member is provided to be swingable in a vertical direction passing a sheet discharge path of a sheet discharged from the sheet discharge outlet, and a posture of the kick member is controlled by shift means. The shift means controls the kick member among a waiting posture retracted upward from the sheet discharge path, an engagement posture for imposing a load on the sheet to engage, and an actuation posture dropping onto the tray together with the sheet.

A first discharging portion that discharges a sheet received from one of image forming apparatus and a second discharging portion discharges a sheet received from another image forming apparatus are disposed opposite each other to stack the sheets discharged in a common processing tray. A controller controls the first and second discharging portions when the sheets are continuously discharged by the first and second discharging portions, controls a timing when the sheets are discharged by the first discharging portion and the second discharging portion to the common processing tray such that a leading edge of the sheet discharged from one of the discharging portions abuts on a sheet surface in the downstream of a discharging direction below a leading edge of the sheet discharged from the other discharging portion.

An apparatus for processing sheets of different formats, the apparatus including a feeding device that feed sheets of different formats in a feeding direction one behind the other, and at a certain conveying speed, at least two collecting drums disposed downstream of the feeding device, the at least two collecting drums having cylindrical lateral surfaces that rotate about an axis of rotation, securing means for temporarily securing the fed sheets on a circumference of the at least two collecting drums, a drive device that drives the collecting drums in rotation at a circumferential speed that corresponds to the conveying speed of the feeding device, and a sensing device for sensing the sheets of different formats moving past is arranged along the conveying path and senses the leading edge of the sheets of different formats, as seen in the feeding direction, or markings applied to the sheets of different formats.

A land grid array (LGA) package including a substrate having a plurality of lands formed on a first surface of the substrate, a semiconductor chip mounted on a second surface of the substrate, a connection portion connecting the semiconductor chip and the substrate, and a support layer formed on part of a surface of a first land.

Disclosed herein is a single mask package apparatus on a device comprising a first substrate having a land disposed on a first surface, a stud disposed on the land and a protective layer disposed over the first surface of the first substrate and around the stud. The protective layer may optionally have a thickness of at least 3 μm. A PPI may be disposed over the protective layer and in electrical contact with the stud, with a first portion of the PPI extending laterally from the stud. An interconnect may be disposed on and in electrical contact with the first portion of the PPI, and a second substrate mounted on the interconnect. A molding compound may be disposed over the PPI and around the interconnect. The stud may be a substantially solid material having a cylindrical cross section and may optionally be wirebonded to the land.

The purpose of the present invention is to provide a projection image display device in which all of the multiple light sources to be used are positioned optimally, regardless of the mode of installation of the device. This projection image display device has two illumination optical systems (1, 2) that are each provided with a light source (111, 211), a color separator for separating into three colors of light, a liquid crystal panel (150, 250) for forming an optical image, and a color synthesis prism (160, 260) for color-synthesizing. A polarization beam splitter (3) for synthesis synthesizes an optical image formed by the illumination optical system (1, 2), and projects the same from a projection lens (4). The optical axis (101, 201) of each light source (111, 211) is positioned within the same plane as the optical axis (401) of the projection lens (4), and so as to orthogonally intersect the optical axis (401) of the projection lens.

A sensor substrate includes a blocking pattern disposed on a base substrate, a first electrode disposed on the base substrate and overlapping the blocking pattern, the first electrode including a plurality of first unit parts arranged in a first direction, each of the first unit parts including a plurality of lines connected to each other in a mesh-type arrangement, a color filter layer disposed on the base substrate, a plurality of contact holes defined in the color filter layer and exposing the first unit parts, and a bridge line between and connected to first unit parts adjacent to each other in the first direction, through the contact holes.

The present invention provides a backlight module and a liquid crystal display device using the backlight module. The backlight module includes: a backplane (2), a light guide plate (4) arranged in the backplane (2), a backlight source (6) arranged in the backplane (2), an optic film assembly (8) arranged above the light guide plate (4), and a reflection plate (9) arranged between the backplane (2) and the light guide plate (4). The backlight source (6) includes a PCB (62) and a plurality of LED lights (64) mounted on and electrically connected to the PCB (62). The backplane (2) includes a bottom plate (22) and a plurality of side plates (24) perpendicularly connected to the bottom plate (22). The bottom plate (22) of the backplane (2) includes a snap-engagement structure (220) formed thereon. The PCB (62) is snap-fit into and retained by the snap-engagement structure (220). The reflection plate (9) is directly positioned on and supported by the PCB (62).

Methods of washing adherent cells, capable of effectively suppressing cell death due to proteolytic enzyme treatment for detaching the adherent cell from a culture vessel and subsequent cell treatment; cell-washing solutions used for the washing method; methods of producing cell suspensions for transplantation using the cell-washing solution; and kits comprising the cell-washing solution. Trehalose or its derivative or a salt thereof is added to physiological aqueous solutions to prepare cell-washing solutions containing trehalose or its derivative or a salt thereof as an active ingredient. The cell-washing solutions can be used to wash adherent cells before detaching the adherent cells from a culture vessel by proteolytic enzyme treatment to suppress cell death due to the proteolytic enzyme treatment. The concentration of trehalose applied to the cell-washing solution may be a concentration capable of suppressing the cell death due to the proteolytic enzyme treatment, such as 0.1 to 20 (w/v) %.

The present invention comprises methods and systems for manipulation of media and particles, whether inert materials or biomaterials, such as cells in suspension cell culture. The methods and systems comprise use of an apparatus comprising a rotating chamber wherein the actions of the combined forces fluid flow force and centrifugal force form a fluidized bed within the rotating chamber.

The invention provides a variable tuning circuit capable of extending a variable range in a high frequency band, ensuring the value of L of an inductor to increase the value of Q of a circuit in a low frequency band, and preventing a reduction in gain, an increase in noise, and unstable oscillation. A variable tuning circuit includes: a first parallel resonance circuit that includes a varactor diode, a capacitor connected in series to the varactor diode, and a first inductor connected in parallel to the varactor diode and the capacitor; and a second parallel resonance circuit that includes a second inductor connected in parallel to the varactor diode with a direct current cut-off capacitor interposed therebetween. When the varactor diode has a maximum capacitance, a resonant frequency of the second parallel resonance circuit is set about a lowest frequency in a variable frequency range.

There are provided a single package television tuning apparatus and a television receiver including the apparatus. The apparatus includes: a printed circuit board; a switching part installed on the printed circuit board and selecting one of a first radio frequency signal and a second radio frequency signal inputted; a tuner part installed on the printed circuit board and down-converting one of the first radio frequency signal and the second radio frequency signal, the one selected by the switching part; first and second input connectors receiving the first radio frequency signal and the second radio frequency signal; and a chassis supporting the first and second input connectors, covering the printed circuit board, the switching part, and the tuner part, and electrically connected to grounds of the switching part and the tuner part.

The present invention provides a central frequency adjustment device and adjustable inductor layout; wherein, the central frequency adjustment device is applied in an inductor/capacitor tank (LC tank) for adjusting the central frequency of the LC tank. The device comprises a first inductor with a first end and a second end; a second inductor with one end coupled with the second end of the first inductor; and, a first trimmable wire connected to the first inductor in parallel and to the second inductor in series, which adjusts the central frequency by cutting off the first trimmable wire.

A pattern printing system and data processing method thereof are disclosed, which are suitable for printing patterns on printed circuit boards or data format rearrangement printing used in displays. The pattern printing method includes a process for interpreting scription data into matrix data, a procedure for modulating the print head resolution and the printing resolution, a procedure for interpreting and transmitting data commands, a procedure for rearranging memory data, and a procedure for firing data synchronously so as to achieve high-resolution printing and to continuously modulate any print data.

A method and to a device for dispensing data from a tachograph to an endless printing medium. A first division is plotted in the longitudinal direction of the printing medium, and a second division is plotted transversely with respect to the longitudinal direction of the printing medium. The first division represents a predetermined unit of time, in particular a day in generalized time coordinates, and the second division represents at least one variable recorded by the tachograph during the unit of time, the at least one variable is depicted by at least one graph.

A data processing apparatus is monitoring the first port of itself and the second port of itself. If the data processing apparatus receives data via the second port, it conducts a specific process to the data regardless of a data format of the data so as to convert the data into the data format that can be processed regardless of a data format of the data and sends converted data to the first port.

Currency bills are received, transported, and imaged to produce image data from which a visually readable image of each currency bill can be reproduced. Each of the currency bills includes a denomination, a serial number, and a set of secondary identifiers. One of the currency bills is determined to be a suspect bill. The suspect bill serial number is attempted to be extracted from the image data associated with the suspect bill. In response to failing to extract a complete serial number of the suspect bill, a serial number field in a suspect report is populated with a serial number snippet image.

Provided are a backlight unit and a display device having the same. The backlight unit includes a case having an opening, at least one lamp assembly disposed on a side surface of the case and including a light source, an optical transreflective unit on the case, the optical transreflective unit transmitting a portion of first light passing through the opening and reflecting a portion of second light generated from the light source, and an optical sheet including a first diffusion unit on the optical transreflective unit.

An RF test and measurement device, including a front end for receiving a time-varying signal and a real-time engine for generating digital frequency domain spectrums based on the time-varying signal. The device also includes a memory subsystem containing a frequency domain bitmap which is updated through sequential receipt and storage of the digital frequency domain spectrums. The real time engine is further configured to monitor the frequency domain bitmap for occurrence of a signal characteristic, and in response to detection of the signal characteristic, cause a capture of the time-varying signal into a storage location of the RF test and measurement device.

An apparatus includes a head transducer configured to interact with a magnetic recording medium and a heater configured to thermally actuate the head transducer. A thermal sensor at or near the head transducer is configured to produce a sensor signal. Circuitry is coupled to the heater and configured to cause an oscillation in heater power. The heater power oscillation causes an oscillation in the sensor signal. A detector is coupled to the thermal sensor and configured to detect head-medium contact using the oscillating sensor signal and heater power.