Xerox Corporation

Scott L Tewinkle

Paul Allen Hosier

Jagdish C Tandon

Paul W Browne

David Jon Metcalfe

Thomas R Beikirch

Pravin N Kothari

Yungran Choi

Roger Lee Triplett

Richard B Eaton

Fred O Hayes

Paul A Hosier, Iii

A light emitting diode (LED) print head arranged to receive a set of raw print data. The print head includes a plurality of LED array chips each having a plurality of LEDs, wherein each LED of the plurality of LEDs includes a process direction position. The print head further includes at least one matrix drive circuit arranged to control activation of the plurality of LEDs in response to the set of raw print data and at least one real-time print data compensation circuit, wherein the at least one real-time print data compensation circuit receives the set of raw print data and delays transmitting the set of raw print data to the at least one matrix drive circuit based on a relative relationship between the process direction position of each LED.

LED print-head driver with integrated process direction compensation

A photosensor chip, such as used in a hard-copy scanner, reads out image data in repeated cycles. With each cycle an on-board counter counts to a predetermined number and resets to zero. When the clock count reaches certain numbers, integration events are initiated with regard to different subsets of photosensors on the chip. The start and stop times of the integrations within each cycle can thus be adjusted via software instructions.

System for controlling integration times of photosensors in an imaging device

A print head, including: a plurality of chips disposed in a linear array; respective pluralities of first and second matrix drivers on each the chip connected to first and second channels, respectively; and for each chip, first groups of light-emitting diodes (LEDs). Each first group of LEDs includes: a second group of LEDs, with a first number of LEDs, connected to a respective first matrix driver; and a third group of LEDs, with the first number of LEDs, connected to a respective second matrix driver. LEDs in each first group of LEDs are disposed in a staggered arrangement; and the respective pluralities of first and second matrix drivers are for activating in sequence the LEDs in the second and third groups of LEDs, respectively.

Alternate matrix drive method for a 1200dpi LED print-head

A photosensitive chip, including first and second sets of photosensors aligned in a Y direction and separated in a perpendicular X direction and third and fourth sets of photosensors aligned in the Y direction and separated in the X direction. The first and third sets are aligned in the X direction. The second and fourth sets are aligned in the X direction. The first and third sets are offset in the Y direction from the second and fourth sets by a distance about equal to a length of a photosensor divided by the number of sets. A time interval between activation of two sequential photosensors from the first through fourth sets of photosensors is substantially equal to the time period of a scan line for the first through fourth sets of photosensors divided by the number of photosensors in the first through fourth sets of photosensors.

Photosensitive chip with shifted rows of photosensors and methods thereof

A photosensitive apparatus including a plurality of photosensor chips and a first common line for applying a first external integration signal to each of the plurality of photosensor chips. Each photosensor chip includes a first set of photosensors having an edge pixel and an interior pixel and a control portion for accepting the first external integration signal, the first external integration signal causing an edge pixel integration signal and an interior pixel integration signal for the first set of photosensors. The control portion includes a first signal adjuster effectively altering the first external integration signal to cause the edge pixel integration signal and the interior pixel integration signal for the first set of photosensors.

Image sensor with integration time compensation

A sensor array, including: a plurality of pixels; first and second video lines; and a plurality of intermediate circuits. Each intermediate circuit is electrically connected to a respective pixel from the plurality of pixels and electrically connected to both the first and second video lines. A method for modifying resolution of a sensor array, the array including first and second video lines, a plurality of pixels, and a plurality of intermediate circuits; and, including: electrically connecting each intermediate circuit to a respective pixel and to the first and second video lines; for a first mode, transmitting a signal from a pixel in the plurality of pixels to the first video line via a respective intermediate circuit from the plurality of intermediate circuits; and for a second mode, transmitting a signal from the pixel to the second video line via the respective intermediate circuit from the plurality of intermediate circuits.

Sensor array with selectable resolution and method thereof

An imaging system, such as having pixel-sized photosensors for recording images, or light emitters or ink-jet ejectors for creating images, comprises a plurality of chips. Each chip includes a shift register with a shift-register-in line; a set of imaging elements associated with the shift register; and a program line, for accepting a program enable signal enabling acceptance of control data relating to a desired operating parameter of the chip. A control system is operable in a first mode wherein each chip in the plurality of chips receives the program enable signal directly through the program line, and a second mode wherein each chip receives the program enable signal through the shift-register-in line.

System for programming a plurality of chips, such as photosensor chips or ink-jet chips, with operating parameters

An imaging system, such as for recording images as digital data, comprises a plurality of imaging chips. Each chip includes a plurality of imaging elements; a data-in input, the data-in input accepting control data of a first type and control data of a second type, the control data of each type having an effect on at least one operational aspect of the imaging elements; and a selection input, the selection input selectably causing the imaging chip to ignore control data in the data-in input. A data-in line is common to the data-in input of all imaging chips. By controlling the selection input to all chips, the chips can be loaded with control signals in parallel, or in serial, with control data specifically intended for each chip.

A photosensitive apparatus, such as a scanner used in a digital copier, includes a plurality of photosensor chips. Each photosensor chip comprises a first set of photosensors, and a control portion for accepting an external integration signal, the signal causing an integration time for the set of photosensors. A signal adjustor is associated with the control portion, and effectively alters the external integration signal to cause the control portion to cause a modified integration time for the first set of photosensors. The system enables adjustments of integration times among chips within an apparatus sharing a common control line.

Multi-chip photosensor with independently adjustable integration times for each chip

An imaging apparatus includes two subsets of photosensors, the two subsets being interleaved along a linear array. Each photosensor is connectable, by the operation of a shift register, to a reference line and a signal line, to permit double-sampling of signals therefrom. Each subset of photosensors is associated with its own reference line and signal line, and signals from the two subsets of photosensors can be read out largely simultaneously.

Multiplexing and offset correction system for an image sensor array

An imaging apparatus, such as used in a digital camera or scanner, includes at least one photosensor chip. Each chip includes one line for conveying a signal causing an integration event of a selected subset of photosensors on the chip, the integration event being one of a starting or ending an integration period for the subset of photosensors. Each chip also includes at least two selection lines, for conveying a multi-bit code identifying the selected subset of photosensors for the integration event.

System for controlling image data readout from an imaging device

A method of operating an imaging system, the imaging system including a plurality of subsets of imaging elements, such as photosensors, light emitters, or ink-jet ejectors. The imaging elements use a regular clock signal for operation. A provisional clock signal, such as an analog sinusoidal signal, is generated. A subset of imaging elements is selected for operation at a particular time. The provisional clock signal is converted to a regular clock signal for use by the selected subset of imaging elements, incidental to an operational period of the selected subset of imaging elements.

Digital imaging chip using an analog clock signal as a provisional clock signal

An imaging apparatus, such as used in a digital camera or scanner, includes at least one photosensor chip. The chip includes subsystems thereon that control the integration periods of the photosensors according to different control data formats. A selector is used to adapt the chip to accept control data of a selected format consistent with a larger apparatus or system.

System for selecting a format for control data in an imaging device

A system for controlling a slew rate of a signal, such as used in an imaging device, comprises a counter for measuring a duration that the signal drops from a maximum voltage to a predetermined reference voltage; a register for retaining a desired duration that the signal drops from the maximum voltage to the predetermined reference voltage; and a comparator for comparing the measured duration to the desired duration, the comparator being operative of a current source for the signal. An anti-oscillation circuit prevents the system from oscillating between two discrete durations.

System for controlling a signal slew rate in a digital device

In an image sensor having a plurality of photodiodes, subsets of photodiodes share a common node for signals to be sent to an amplifier. Within each subset, each individual photodiode is selected for sending signals to the amplifier by an associated selection device. The selection device is a MOS device operating in a linear region. The subset of photodiodes share a common 'fill and spill' or 'bucket brigade' transfer circuit to the amplifier, the transfer circuit including at least one MOS device which operates in a subthreshold region.

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Ontario, NY, United States of America

Scott L Tewinkle