# US 8,749,720 B2 · Exposing device

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- Number: US 8,749,720 B2
- Document ID: US8749720B2
- Status: Granted
- Kind: B2
- Application number: 12/880,540
- Filed: 2010-09-13
- Published: 2011-07-28
- Granted: 2014-06-10
- Earliest claimed: 2010-01-26
- Assignees: Fuji Xerox Co., Ltd.
- Applicants: Shin Yasuda; Keishi Shimizu
- Inventors: Shin Yasuda; Keishi Shimizu
- Web page: https://patentgrep.com/patent/US8749720B2

## CPC

- G02F 1/29: for the control of the position or the direction of light beams, i.e. deflection
- B41J 2/451: {Special optical means therefor, e.g. lenses, mirrors, focusing means}
- G03G 15/04054: {by LED arrays}
- G03G 15/04063: {by EL-bars}
- G03G 15/0435: {by introducing an optical element in the optical path, e.g. a filter}
- G02F 1/133531: {characterised by the arrangement of polariser or analyser axes}
- G03G 2215/0412: Electroluminescent elements, i.e. EL-array
- G03G 2215/0414: Liquid-crystal display elements, i.e. LCD-shutter array
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

An exposing device includes: a first light-emitting element that emits first light; a second light-emitting element that emits second light; and a liquid crystal panel that is disposed between the first and second light-emitting elements and a photoreceptor body to be exposed to the second light, and focuses the second light on the photoreceptor body by a convex refractive index distribution that is formed in the liquid crystal panel by an orientation variation that is caused by illumination with the first light.

## Claims

### Claim 1

An exposing device comprising:
a first light-emitting diode that emits first light;
a first polarizing plate that polarizes the first light;
a second light-emitting diode that emits second light;
a second polarizing plate that polarizes the second light in a direction that is perpendicular to a polarization direction of the first polarizing plate; and
a liquid crystal panel that is disposed between the first and second light-emitting diodes and a photoreceptor body to be exposed to the second light,
the liquid crystal panel configured to act as a convex refractive lens due to an orientation variation that is caused by illumination with the first light, the liquid crystal panel being configured to focus the second light on the photoreceptor body via the convex refractivelens, and the liquid crystal panel being further configured to transmit polarized light having a polarization direction that is same as the polarization direction of the second polarizing plate.

### Claim 2 (depends on 1)

The exposing device according to claim 1, wherein
the first light has a first wavelength,
the second light has a second wavelength that is different than the first wavelength, and
the liquid crystal panel is light-responsive to light having the first wavelength.

### Claim 3 (depends on 1)

The exposing device according to claim 1, wherein a direction in which the first light is emitted is the same as a direction in which the second light is emitted.