# US 2013/0155336 A1 · Projector

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- Number: US 2013/0155336 A1
- Document ID: US20130155336A1
- Status: Published application
- Kind: A1
- Application number: 13/809,717
- Filed: 2011-07-07
- Published: 2013-06-20
- Earliest claimed: 2010-07-12
- Assignees: Funai Electric Co., Ltd.
- Inventors: Kenji Nagashima
- Web page: https://patentgrep.com/patent/US20130155336A1

## CPC

- H04N 9/3129: {scanning a light beam on the display screen (scanning a light beam on a screen in displays other than projection devices G09G3/02; scanning systems in general G02B26/10; projectors using laser light sources in general H04N9/3161)}
- G02B 26/101: {with both horizontal and vertical deflecting means, e.g. raster or XY scanners (colour television using laser beams scanning a display screen H04N9/3129)}
- G02B 30/24: involving temporal multiplexing, e.g. using sequentially activated left and right shutters
- G02B 30/25: using polarisation techniques
- G02F 1/1313: {specially adapted for a particular application}
- G03B 21/14: Details
- G03B 21/2013: {Plural light sources}
- G03B 21/2033: {LED or laser light sources}
- G03B 21/2053: {Intensity control of illuminating light (controlled by video signal processing H04N5/74 or H04N9/31)}
- G03B 21/28: Reflectors in projection beam {(in illumination beam G03B21/2066)}
- H04N 13/324: Colour aspects
- H04N 13/334: using spectral multiplexing
- H04N 13/337: using polarisation multiplexing
- H04N 13/363: using image projection screens (volumetric display H04N13/388)
- H04N 13/365: using digital micromirror devices [DMD]
- G02B 27/48: Laser speckle optics
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- 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
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)

## Abstract

Provided is a projector capable of suppressing deterioration of a portion of a projection portion irradiated with a laser beam while improving brightness. This projector is formed to deviate optical axes of laser beams emitted from a plurality of laser beam generation portions respectively from each other so that the laser beams emitted from the plurality of laser beam generation portions respectively do not concentrate on one point of a projection portion.

## Claims

### Claim 1

A projector comprising:
a plurality of laser beam generation portions emitting laser beams having substantially identical lasing wavelengths; and
a projection portion projecting an image onto an arbitrary projection area by scanning the laser beams emitted from the plurality of laser beam generation portions respectively, and
formed to deviate optical axes of the laser beams emitted from the plurality of laser beam generation portions respectively from each other so that the laser beams emitted from the plurality of laser beam generation portions respectively do not concentrate on one point of the projection portion.

### Claim 2 (depends on 1)

The projector according to claim 1, further comprising a control portion controlling generation timings of the laser beams emitted from the plurality of laser beam generation portions respectively, wherein
the control portion is formed to deviate the timings when the plurality of laser beam generation portions emit the laser beams from each other in response to the quantities of deviation of the optical axes of the laser beams emitted from the plurality of laser beam generation portions respectively so that the image projected onto the arbitrary projection area substantially coincides when the image is projected by scanning the laser beams emitted from the plurality of laser beam generation portions whose optical axes have been deviated from each other.

### Claim 3 (depends on 2)

The projector according to claim 2, wherein
the control portion is formed to deviate the timings when the plurality of laser generation portions emit the laser beams from each other in response to the quantities of deviation of the optical axes of the laser beams emitted from the plurality of laser beam generation portions respectively so that the image projected onto the arbitrary projection area substantially coincides.

### Claim 4 (depends on 1)

The projector according to claim 1, wherein
the plurality of laser beam generation portions emitting the laser beams having substantially identical lasing wavelengths include a first laser beam generation portion for emitting a first laser beam and a second laser beam generation portion for emitting a second laser beam, and
the projector is formed to synthesize the first laser beam and the second laser beam with each other while deviating the optical axes of the first laser beam and the second laser beam from each other so that the first laser beam and the second laser beam do not concentrate on one point of the projection portion.

### Claim 5 (depends on 4)

The projector according to claim 4, wherein
the first laser beam generation portion is formed to emit the first laser beam having a first polarization direction,
the second laser beam generation portion is formed to emit the second laser beam having a second polarization direction orthogonal to the first polarization direction, and
the projector is formed to synthesize the first laser beam and the second laser beam with each other while deviating the optical axes of the first laser beam having the first polarization direction and the second laser beam having the second polarization direction from each other so that the first laser beam and the second laser beam do not concentrate on one point of the projection portion.

### Claim 6 (depends on 4)

The projector according to claim 4, further comprising a plurality of optical members reflecting the first laser beam emitted from the first laser beam generation portion and the second laser beam emitted from the second laser beam generation portion or transmitting the first and second laser beams therethrough, and
formed to synthesize the first laser beam and the second laser beam with each other while deviating the optical axes of the first laser beam and the second laser beam from each other so that the first laser beam and the second laser beam do not concentrate on one point not only with respect to the projection portion but also with respect to the plurality of optical members.

### Claim 7 (depends on 4)

The projector according to claim 4, so formed that the first laser beam and the second laser beam are applied through substantially identical paths in a state where the optical axes deviate from each other after being synthesized, not to concentrate on one point of the projection portion.

### Claim 8 (depends on 4)

The projector according to claim 4, so formed that the first laser beam and the second laser beam are emitted not to concentrate on one point of the projection portion in a state where the optical axes substantially parallelly deviate from each other.

### Claim 9 (depends on 4)

The projector according to claim 4, wherein
the first laser beam generation portion includes a first red laser beam generation portion, a first green laser beam generation portion (62a) and a first blue laser beam generation portion.
the second laser beam generation portion includes a second red laser beam generation portion, a second green laser beam generation portion and a second blue laser beam generation portion,
the projector is so formed that optical axes of the first laser beams emitted from the first red laser beam generation portion, the first green laser beam generation portion and the first blue laser beam generation portion respectively overlap on the same axis,
so formed that optical axes of the second laser beams emitted from the second red laser beam generation portion, the second green laser beam generation portion and the second blue laser beam generation portion respectively overlap on the same axis, and
formed to deviate the optical axes of the first laser beams emitted from the first red laser beam generation portion, the first green laser beam generation portion and the first blue laser beam generation portion respectively to overlap on the same axis and the optical axes of the second laser beams emitted from the second red laser beam generation portion, the second green laser beam generation portion and the second blue laser beam generation portion respectively to overlap on the same axis from each other.

### Claim 10 (depends on 5)

The projector according to claim 5, further comprising a spatial modulator for rotating at least one of the first polarization direction of the first laser beam and the second polarization direction of the second laser beam by a prescribed angle.

### Claim 11 (depends on 10)

The projector according to claim 10, wherein
the spatial modulator is formed to rotate at least one of the first polarization direction of the first laser beam and the second polarization direction of the second laser beam by 90 degrees.

### Claim 12 (depends on 11)

The projector according to claim 11, wherein
the spatial modulator is formed to alternately repeat an operation of rotating both of the first polarization direction of the first laser beam and the second polarization direction of the second laser beam by 90 degrees and an operation of transmitting the first laser beam and the second laser beam therethrough as such without rotating both of the first polarization direction of the first laser beam and the second polarization direction of the second laser beam.

### Claim 13 (depends on 12)

The projector according to claim 12, wherein
the spatial modulator includes a liquid crystal device, and
the liquid crystal device is formed to alternately repeat the operation of rotating both of the first polarization direction of the first laser beam and the second polarization direction of the second laser beam by 90 degrees and the operation of transmitting the first laser beam and the second laser beam therethrough as such without rotating both of the first polarization direction of the first laser beam and the second polarization direction of the second laser beam by being switched to an ON-state and to an OFF-state.

### Claim 14 (depends on 5)

The projector according to claim 5, wherein
the first laser beam having the first polarization direction includes one of a laser beam of an S wave and a laser beam of a P wave orthogonal to the laser beam of the S wave,
the second laser beam having the second polarization direction includes the other one of the laser beam of the S wave and the laser beam of the P wave orthogonal to the laser beam of the S wave, and
the projector is formed to synthesize the laser beam of the S wave and the laser beam of the P wave with each other while deviating optical axes of the laser beam of the S wave and the laser beam of the P wave from each other so that the laser beam of the S wave and the laser beam of the P wave do not concentrate on one point of the projection portion.

### Claim 15 (depends on 5)

The projector according to claim 5, wherein
the projection portion is formed to be capable of projecting a stereoscopic image onto the arbitrary projection area by scanning the first laser beam and the second laser beam, and
formed to project a stereoscopic image for a right eye by scanning one of the first laser beam and the second laser beam and to project a stereoscopic image for a left eye by scanning the other one of the first laser beam and the second laser beam.

### Claim 16 (depends on 15)

The projector according to claim 15, so formed that a laser beam projecting the stereoscopic image for the right eye by scanning one of the first laser beam and the second laser beam and a laser beam projecting the stereoscopic image for the left eye by scanning the other one of the first laser beam and the second laser beam project the stereoscopic images in a state where optical axes deviate from each other.

### Claim 17 (depends on 16)

The projector according to claim 16, so formed that the laser beam projecting the stereoscopic image for the right eye and the laser beam projecting the stereoscopic image for the left eye project the stereoscopic images by being simultaneously emitted in the state where the optical axes deviate from each other.

### Claim 18 (depends on 1)

The projector according to claim 1, wherein
the projection portion includes a vibrating mirror projecting the image by scanning the arbitrary projection area in a vertical direction and a transverse direction, and
the projector is formed to deviate optical axes of the laser beams emitted from the plurality of laser beam generation portions respectively from each other so that the laser beams emitted from the plurality of laser beam generation portions respectively do not concentrate on one point of the vibrating mirror.

### Claim 19 (depends on 1)

The projector according to claim 1, further comprising a sensing portion sensing that a projection screen projected by the projection portion in the state where the optical axes of the laser beams emitted from the plurality of laser beam generation portions respectively deviate from each other has been operated by the user.

### Claim 20 (depends on 1)

The projector according to claim 1, further comprising a splitter member projecting a projection screen projected by the projection portion in the state where the optical axes of the laser beams emitted from the plurality of laser beam generation portions respectively deviate from each other on a plurality of projection areas.