Oscillating Mirror Bidirectional Scanning Laser Printer
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Solution Overview
Problem
Conventional laser printers using oscillating mirrors face challenges with increased turnaround time, leading to reduced scanning efficiency and the need for higher power lasers, which are costly, due to unidirectional scanning and variations in oscillation frequency.
Innovation Solution
A scanning system that uses an oscillating mirror for bidirectional scanning across a photoconductive surface, dynamically scaling the intensity of the image beam as a function of its position to compensate for oscillation frequency variations and slanted scanning, allowing for lower power laser diodes and reduced costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If unidirectional scanning is used with oscillating mirrors, then the scanning system is simpler, but the turnaround time increases and scanning efficiency decreases
Solution Approach 1:
The patent implements bidirectional scanning by dynamically reversing the scanning direction halfway through each oscillation cycle of the oscillating mirror. The control circuitry monitors the mirror's position and switches the scanning direction accordingly, allowing the laser beam to scan in both forward and backward directions across the photoconductive surface. This dynamic direction switching eliminates the dead time associated with unidirectional scanning while maintaining the simplicity of the oscillating mirror mechanism.
Solution Approach 2:
The patent utilizes the periodic oscillation of the mirror to create alternating forward and backward scanning cycles. By synchronizing the scanning direction changes with the mirror's oscillation period, the system achieves continuous scanning without interruption. The periodic reversal of scanning direction allows the laser beam to cover the entire surface area more efficiently, doubling the productive scanning time within each oscillation cycle.
2Productivity
If bidirectional scanning is implemented, then scanning efficiency improves, but the need for higher power lasers increases due to frequency variations
Solution Approach 1:
The patent dynamically adjusts the laser beam's power level in response to changes in the oscillating mirror's frequency. The control circuitry monitors the mirror's oscillation characteristics and modulates the laser power accordingly, increasing power when the mirror frequency deviates from the expected value to maintain proper discharge levels on the photoconductive surface. This adaptive power adjustment ensures consistent scanning performance despite frequency variations.
Solution Approach 2:
The system incorporates feedback mechanisms where the control circuitry continuously monitors the oscillating mirror's performance and adjusts laser parameters in real-time. By detecting frequency deviations and responding with appropriate power adjustments, the system maintains stable scanning conditions. The feedback loop ensures that the laser power is optimized for each scanning cycle, compensating for mirror frequency variations without requiring excessively high power levels.
3Power
If higher power laser diodes are used, then scanning capability is sufficient, but the printer cost increases
Solution Approach 1:
The patent employs lower power laser diodes than would traditionally be required for bidirectional scanning, achieving sufficient scanning capability through intelligent control. By using partial action - activating the laser only when needed and adjusting power dynamically - the system avoids the need for excessive power hardware. The control circuitry compensates for the lower laser power by optimizing scan timing and intensity modulation, thereby reducing component costs while maintaining performance.
Solution Approach 2:
The system dynamically modulates the laser diode power output based on real-time scanning conditions and mirror frequency. By changing the power parameter adaptively rather than relying on continuously high power, the patent enables the use of lower-cost laser diodes. The control circuitry adjusts the power level to match the specific requirements of each scanning cycle, eliminating the need to overspecify the laser hardware with high-power components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances scanning efficiency, reduces the need for high-power lasers, and lowers the overall cost of the printer by utilizing lower power laser diodes while maintaining image quality.
Implementation Method 1
reflect the image beam off the oscillating mirror to discharge regions on the surface
Implementation Method 2
discharge regions on the surface
Data Source
AI summary
A scanning system is adapted to scan an image beam across a photoconductive surface. The scanning system includes an oscillating mirror and is operable to generate an image beam and to reflect the image beam off the oscillating mirror to bidirectionally scan the image beam across the photoconductive surface and thereby discharge regions on the surface. The system is further operable to dynamically scale an intensity of the image beam as a function of a position of the image beam on the photoconductive surface.