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Image forming apparatus

An image and image data technology, applied in the field of image forming devices, can solve the problems of increasing the scale of laser drivers and image processing circuits, etc.

Inactive Publication Date: 2013-03-06
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Therefore, it is necessary to receive from an image processing circuit (image processing IC) etc. which area the laser light is scanning in the main scanning direction, and the laser driver switches the laser drive current accordingly, resulting in an increase in the circuit scale of the laser driver and image processing circuit

Method used

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Embodiment Construction

[0084] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0085] In the following description, a case where the image forming apparatus of the present invention is applied to a copier will be described.

[0086] figure 1 is an overall configuration diagram of a copying machine according to an embodiment of the present invention, figure 2 It is a schematic block diagram showing an electrical configuration of a main part of a copying machine according to an embodiment of the present invention, and mainly shows a connection state of a laser scanning unit and an image processing unit.

[0087] Such as figure 1 As shown, the scanner unit 1 reads the image of the document 12 placed on the document stage 11 made of hard transparent glass through the lamp unit 13, reflectors 14 to 16, and the lens unit 17 through the CCD sensor 18. , and send the read image data to the image processing unit 2 . Original 12 in figure 1 The docume...

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Abstract

An image forming apparatus includes a pulse width modulation unit that changes pulse width of a signal in accordance with image data, and an image forming unit that forms an image by a driving laser beam with a signal whose pulse width has been modulated by the pulse width modulation unit and scanning a photosensitive body, and corrects the pulse width of the signal output by the pulse width modulation unit in accordance with a density unevenness characteristics in the main scanning direction of the image forming unit.

Description

technical field [0001] The present invention relates to an image forming apparatus that performs printing by laser light, and more particularly, to an image forming apparatus capable of correcting unevenness in print density caused by unevenness in the sensitivity of a photoreceptor in the main scanning direction. Background technique [0002] In general, in an image forming apparatus, density unevenness in the main scanning direction occurs due to uneven exposure of a photoreceptor to laser light, uneven transfer from a photoreceptor to a transfer belt, or uneven transfer to paper. [0003] As one of methods for correcting density unevenness, a method for correcting the light amount of laser light is actually used. [0004] In this method, the density unevenness in the main scanning direction is measured in advance, the correction amount is determined based on the measurement result, and the current value for driving the laser is corrected in accordance with the printing ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/00G03G15/00
CPCH04N1/00031H04N1/00015H04N1/0009H04N1/0005H04N1/4015H04N1/00063B41J2/435G03G15/043G03G15/5041H04N1/00082H04N1/00042H04N1/00047H04N1/00045
Inventor 大西一幸
Owner SHARP KK