| Patent application number | Description | Published |
|---|
| 20090110015 | Current Driver And Power Control For Electrophotographic Devices - A laser driver comprises a plurality of current sources, including at least one bias current source and at least two drive current sources. To control the laser driver, a set of operating states is defined where each operating state corresponds to a desired laser output power level and a ratio is defined that establishes a relationship between a first desired laser output and a second desired laser output. A calibration operation samples laser output power of the laser source for less than all of the operating states, computes adjustments to the current levels of the current sources based at least in part upon the ratio such that sampled laser power levels converge towards their corresponding desired laser output level. The current sources are adjusted to their corresponding computed current levels. | 04-30-2009 |
| 20090138746 | Method For Efficient Software Generation Of Multiple Pulse Width Modulated Signals - Pulse width modulation signals are generated by identifying an event table having a plurality of events, each event including a time to next event parameter. Each desired pulse width modulation signal is characterized by a first event designating a transition from a first state to a second state and a second event designating a transition from the second state back to the first state. An event pointer is set to select a current event and the event table is repeatedly cycled through by updating the output for at least each pulse width modulation signal associated with the current event having a designated state transition, detecting that a time period has lapsed corresponding to the time to next event parameter associated with the current event, incrementing the event pointer to point to a next event in the event table and conveying each pulse width modulation signal to a corresponding circuit. | 05-28-2009 |
| 20090279155 | Multiharmonic Galvonometric Scanning Device - A scanning apparatus for a printer or similar instrument. A multiharmonic oscillator is used to provide a composite motion of a laser beam or other light beam to scan an imaging surface. The multiharmonic oscillator may have multiple sections each having a different resonant frequency. One section includes a reflector that intercepts the light beam, and drive electronics move the reflector so the light beam scans the imaging surface. Linear and complex non-linear motions of the light beam may be achieved. Microelectromechanical systems (MEMS) technology may be used to fabricate the oscillator. | 11-12-2009 |
