US 2013/0155166 A1 · OPTICAL SCANNING APPARATUS AND IMAGE FORMING DEVICE

Abstract

An optical scanning apparatus includes a light source, an optical deflector having a rotary polygon mirror to deflect a light beam from the light source, a scanning optical system configured to focus the light beam deflected by the optical deflector on a target surface, a sync detecting sensor configured to determine a write start timing on the target surface, and a processing unit configured to correct detection data of the sync detecting sensor based on a measured value of a time needed for one revolution of the rotary polygon mirror.

Claims16

Dependent claims

An optical scanning apparatus, comprising:

a light source;
an optical deflector having a rotary polygon mirror to deflect a light beam from the light source;
a scanning optical system configured to focus the light beam deflected by the optical deflector on a target surface to be scanned;
a sync detecting sensor configured to determine a write start timing on the target surface;
and
a processing unit configured to correct detection data of the sync detecting sensor based on a measured value of a time needed for one revolution of the polygon mirror.

3 more elements

An image forming device including a processing unit to control the image forming device, the processing unit comprising:

a first sync signal generating part configured to detect scanning timing of a first photoconductor and generate a first sync signal;
a first counter configured to receive the first sync signal and a first pixel clock and measure a rotational period of a rotary polygon mirror;
a first pixel clock generating part configured to adjust the frequency of the first pixel clock to make the rotational period measured by the first counter equal to a predetermined value;
and
a false sync signal generating part configured to generate a false sync signal for measuring timing of scanning of a second photoconductor, based on the first sync signal and the first pixel clock.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

13/718,514Filed 18 Dec 2012

Priority

JP 2011-27716119 Dec 2011

Published

20 Jun 2013

Term ends

Not estimatedThe source records don’t support an estimate.

Classification10 codes

B41J 2/473
Using dot sequential main scanning by means of a light deflector, e.g. a rotating polygonal mirror: using multiple light beams, wavelengths or colours
B41J 2/471
Using the combination of scanning and modulation of light: using dot sequential main scanning by means of a light deflector, e.g. a rotating…
G02B 26/123
Using multifaceted mirrors: multibeam scanners, e.g. using multiple light sources or beam splitters
G02B 26/127
Using multifaceted mirrors: adaptive control of the scanning light beam, e.g. using the feedback from one or more detectors

Optical scanning apparatus and image forming device

Life of this patent

Optical scanning apparatus and image forming device

Life of this patent

Abstract

Claims16