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AssigneeFuji Xerox Co., Ltd.
InventorsMasaki Fujise, Yasuhiro Arai, Kenji Koizumi, Hayato Yoshikawa
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An exposing device includes a plurality of exposing units which forms a latent image, wherein exposing units includes: an exposure light source; a rotating polyhedron that reflects light from the exposure light source; a driving source that rotates the rotating polyhedron; a first detecting unit that detects the number of rotations of the driving source; a second detecting unit that detects the light from the exposure light source at a position; and a control unit that performs a first control of the driving source based on a detection signal of the first detecting unit at a start of the rotation of the rotating polyhedron and thereafter performs a second control of the driving source based on a detection signal of the second detecting unit.
An exposing device comprising;
An image forming apparatus comprising:
A computer readable medium storing a program causing a computer to execute a process for controlling exposure, the process comprising:
Dependencies are inferred from the claim text.
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Using dot sequential main scanning by means of a light deflector, e.g. a rotating polygonal mirror: using multiple light beams, wavelengths or colours
Typewriters
About 4 years of term left · ends 10 Nov 2030 (estimated)
This application is based on and claims priority under 35 USC 119 from Japanese Patent Application No. 2009-051590 filed on Mar. 5, 2009.
The present invention relates to an exposing device, an image forming apparatus and computer readable medium for controlling an exposure.
According to an aspect of the invention, an exposing device includes a plurality of exposing units which forms a latent image, wherein each of the plurality of exposing units includes: an exposure light source; a rotating polyhedron that reflects light from the exposure light source to exposedly scan a photoconductor with the reflected light while rotating; a driving source that rotates the rotating polyhedron; a first detecting unit that detects the number of rotations of the driving source; a second detecting unit that detects the light from the exposure light source at a position, the light being reflected by the rotating polyhedron; a control unit that performs a first control of the driving source based on a detection signal of the first detecting unit at a start of the rotation of the rotating polyhedron and thereafter performs a second control of the driving source based on a detection signal of the second detecting unit; and the exposing device includes a process performing unit that performs a process if a phase difference between the detection signal of the second detecting unit of each of the exposing units and a predetermine signal has no relationship when the first control is switched over to the second control by the control unit of the exposing unit.
Exemplary embodiments of the invention will be described in detail based on the following figures.
FIG. 1 is an explanatory view of an image forming apparatus according to one exemplary embodiment of the present invention.
FIG. 2 is a block diagram showing an electrical connection of an exposing device of the image forming apparatus according to one exemplary embodiment of the present invention.
Hereinafter, one exemplary embodiment of the present invention will be described.
FIG. 1 is an explanatory view of an image forming apparatus according to this exemplary embodiment.
An image forming apparatus 1 includes photoconductors 10 on which toner images are formed on the surface thereof, a transfer belt 11, carrying rollers 12 (12A and 12B) which carry the transfer belt 11 in a predetermined direction, rollers 13 (13A and 13B) which carry the transfer belt 11 and transfer the toner image onto a sheet 15, and image position detecting sensors 14 (14A, 14B and 14C) which detect a position of a final toner image.