Image forming device
AssigneeFuji Xerox Co., Ltd.
InventorTakayoshi Suzuki
Life of this patent
Estimating the term…
Abstract
The magnification of an image in the main scanning direction thereof is altered by making the frequency of the image clock variable. At this time, if the pre-SOS lighting signal and the APC signal are output synchronously with the frequency of the image clock, then an SOS signal may not be output from the SOS sensor and control of the amount of light of a light beam may not be accurately executed. Therefore, the timings of the outputs of the pre-SOS lighting signal and the APC signal are controlled so as to normally be output at a uniform timing (i.e. the periods from the input of the SOS signal until the outputs of each signal are made uniform).
Claims8
An image forming device capable of altering a magnification of an image in a main scanning direction by making a frequency of an image clock variable, comprising:
- a first output means which outputs a lighting instructing signal for instructing that a light beam emitted from a light source be turned on, on the basis of main scanning signals output from a scan sensor for each main scanning;
- a second output means for outputting a light amount control instructing signal for instructing that control of an amount of light of the light beam be executed, on the basis of the main scanning signals output for each main scanning;
- and a control means for controlling said first output means and said second output means so that periods from the output of said main scanning signals until the outputs of said lighting instructing signal and said light amount control instructing signal become uniform regardless of changes in the frequency of said image clock.
An image forming device capable of altering a magnification of an image in a main scanning direction by making a frequency of an image clock variable, comprising:
- a first output device which outputs a lighting instructing signal for instructing that a light beam emitted from a light source be turned on, on the basis of main scanning signals output from a scan sensor for each main scanning;
- a second output device for outputting a light amount control instructing signal for instructing that control of the amount of light of the light beam be executed, on the basis of the main scanning signals output for each main scanning;
- and a control device for controlling said first output device and said second output device so that periods from the output of said main scanning signal until the outputs of said lighting instructing signal and said light amount control instructing signal become uniform regardless of changes in the frequency of said image clock.
Dependencies are inferred from the claim text.