Clock control apparatus and method and image forming apparatus using clock control apparatus
First Claim
1. A control apparatus for controlling a clock for drawing drive in an image forming apparatus, comprising:
- a first synchronizing clock generation unit that generates a first synchronizing clock synchronized with a main-scanning synchronizing signal based on said main-scanning synchronizing signal and an original clock;
a delay unit that generates a delayed clock by delaying said first synchronizing clock in accordance with a designated correction amount;
a pseudo synchronizing signal generation unit that generates a pseudo synchronizing signal based on said delayed clock generated by said delay unit; and
a second synchronizing clock generation unit that generates a second synchronizing clock synchronized with said pseudo synchronizing signal based on said pseudo synchronizing signal and said original clock.
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Abstract
A clock control apparatus which generates a clock for laser drive in latent image formation in an image forming apparatus. A main-scanning synchronizing clock generation unit 603 generates a synchronizing clock synchronized with a main-scanning synchronizing signal based on the main-scanning synchronizing signal and an original clock. A delay unit 604 delays the synchronizing clock so as to correct a mechanical shift upon latent image drawing by laser drive. A pseudo main-scanning synchronizing signal generation unit 103 generates a pseudo main-scanning synchronizing signal based on the synchronizing clock delayed by the delay unit 604, and supplies the pseudo main-scanning synchronizing signal to the main-scanning synchronizing clock generation unit 603. The main-scanning synchronizing clock generation unit 603 generates a clock synchronized with the pseudo main-scanning synchronizing signal. The clock is supplied via a clock selection unit 102 to a PWM generation unit 605, and is used for the laser drive.
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Citations
18 Claims
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1. A control apparatus for controlling a clock for drawing drive in an image forming apparatus, comprising:
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a first synchronizing clock generation unit that generates a first synchronizing clock synchronized with a main-scanning synchronizing signal based on said main-scanning synchronizing signal and an original clock;
a delay unit that generates a delayed clock by delaying said first synchronizing clock in accordance with a designated correction amount;
a pseudo synchronizing signal generation unit that generates a pseudo synchronizing signal based on said delayed clock generated by said delay unit; and
a second synchronizing clock generation unit that generates a second synchronizing clock synchronized with said pseudo synchronizing signal based on said pseudo synchronizing signal and said original clock. - View Dependent Claims (2, 3, 4, 5)
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6. A control method for controlling a clock for drawing drive in an image forming apparatus, comprising the steps of:
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generating a first synchronizing clock synchronized with a main-scanning synchronizing signal based on said main-scanning synchronizing signal and an original clock;
generating a delayed clock by delaying said first synchronizing clock in accordance with a designated correction amount;
generating a pseudo synchronizing signal based on said delayed clock; and
generating a second synchronizing clock synchronized with said pseudo synchronizing signal based on said pseudo synchronizing signal and said original clock. - View Dependent Claims (7, 8, 9, 10)
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11. An image forming apparatus comprising:
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a first synchronizing clock generation unit that generates a first synchronizing clock synchronized with a main-scanning synchronizing signal based on said main-scanning synchronizing signal and an original clock;
a delay unit that generates a delayed clock by delaying said first synchronizing clock in accordance with a designated correction amount;
a pseudo synchronizing signal generation unit that generates a pseudo synchronizing signal based on said delayed clock generated by said delay unit;
a second synchronizing clock generation unit that generates a second synchronizing clock synchronized with said pseudo synchronizing signal based on said pseudo synchronizing signal and said original clock; and
drawing means for performing a drawing operation based on said second synchronizing clock and image data to be used in image formation. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification