# US 9,753,359 B2 · Projection apparatus including a noise reduction mechanism provided between a light source and an image display element

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- Number: US 9,753,359 B2
- Document ID: US9753359B2
- Status: Granted
- Kind: B2
- Application number: 14/867,818
- Filed: 2015-09-28
- Published: 2016-03-31
- Granted: 2017-09-05
- Earliest claimed: 2014-09-29
- Assignees: Casio Computer Co., Ltd.; Toyoda Gosei Co., Ltd.
- Applicants: Casio Computer Co., Ltd.; Toyoda Gosei Co., Ltd.
- Inventors: Naotsugu Ogura; Kazumasa Baba; Hiromitsu Takeuchi
- Web page: https://patentgrep.com/patent/US9753359B2

## CPC

- G03B 21/14: Details
- G02B 27/0927: {Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat}
- G02B 27/48: Laser speckle optics
- H04N 9/3152: {for shaping the light beam (beam shaping per se G02B27/09)}
- H04N 9/3161: {using laser light sources (using laser beams scanning the display screen H04N9/3129)}
- 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)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

A projection apparatus includes a light source to emit a light beam, an image display element to provide image information to the light beam, and a noise reduction mechanism disposed between the light source and the image display element. The noise reduction mechanism includes an optical element to transmit the light beam emitted from the light source, a dielectric elastomer fixed to the optical element, and first and second electrodes provided on first and second surfaces of the dielectric elastomer, respectively. The dielectric elastomer is deformed in accordance with the application of a voltage across the first and second electrodes to moves the optical element.

## Claims

### Claim 1

A projection apparatus comprising:
a light source to emit a light beam;
an image display element to provide image information to the light beam; and
a noise reduction mechanism disposed between the light source and the image display element,
wherein the noise reduction mechanism comprises:
an optical element to transmit the light beam emitted from the light source;
a dielectric elastomer fixed to the optical element; and
first and second electrodes provided on first and second surfaces of the dielectric elastomer, respectively, wherein the dielectric elastomer is deformed in accordance with application of a voltage across the first and second electrodes to move the optical element, and
wherein:
the light source includes a laser light source,
the projection apparatus further comprises a microlens array, disposed between the noise reduction mechanism and the image display element, to convert the light beam into a light beam having a substantially uniform intensity distribution,
the noise reduction mechanism includes the dielectric elastomer fixed to the optical element, and a current-carrying circuit to apply a voltage to the dielectric elastomer, and
the current-carrying circuit repeatedly turns on and off the application of the voltage to the dielectric elastomer so that a beam spot formed on the microlens array is scanned.

### Claim 2

A projection apparatus comprising:
a light source to emit a light beam;
an image display element to provide image information to the light beam; and
a noise reduction mechanism disposed between the light source and the image display element,
wherein the noise reduction mechanism comprises:
an optical element to transmit the light beam emitted from the light source;
two dielectric elastomers fixed to the optical element; and
on each of the dielectric elastomers, first and second electrodes provided on first and second surfaces of the dielectric elastomer, respectively, wherein the dielectric elastomer is deformed in accordance with application of a voltage across the first and second electrodes to move the optical element, and
wherein:
the light source includes a laser light source,
the projection apparatus further comprises a microlens array, disposed between the noise reduction mechanism and the image display element, to convert the light beam into a light beam having a substantially uniform intensity distribution,
the noise reduction mechanism includes the two dielectric elastomers fixed to the optical element, and two current-carrying circuits to apply voltages to the two dielectric elastomers, respectively,
the two dielectric elastomers are arranged symmetrically with respect to the optical element, and
the two current-carrying circuits repeatedly turn on and off the application of the voltages to the two dielectric elastomers at the same time so that the optical element is repeatedly translated along an optical axis and a beam spot formed on the microlens array is enlarged and reduced.

### Claim 3

A projection apparatus comprising:
a light source to emit a light beam;
an image display element to provide image information to the light beam; and
a noise reduction mechanism disposed between the light source and the image display element,
wherein the noise reduction mechanism comprises:
an optical element to transmit the light beam emitted from the light source;
two dielectric elastomers fixed to the optical element; and
on each of the dielectric elastomers, first and second electrodes provided on first and second surfaces of the dielectric elastomer, respectively, wherein the dielectric elastomer is deformed in accordance with application of a voltage across the first and second electrodes to move the optical element, and
wherein:
the light source includes a laser light source,
the projection apparatus further comprises a microlens array, disposed between the noise reduction mechanism and the image display element, to convert the light beam into a light beam having a substantially uniform intensity distribution,
the noise reduction mechanism includes the two dielectric elastomers fixed to the optical element, and two current-carrying circuits to apply voltages to the two dielectric elastomers, respectively, and
the two current-carrying circuits alternately and repeatedly turn on and off the application of the voltages to the two dielectric elastomers so that the optical element is repeatedly inclined relative to an optical axis and a beam spot formed on the microlens array is scanned.

### Claim 4

A projection apparatus comprising:
a light source to emit a light beam;
an image display element to provide image information to the light beam; and
a noise reduction mechanism disposed between the light source and the image display element,
wherein the noise reduction mechanism comprises:
an optical element to transmit the light beam emitted from the light source;
three or more dielectric elastomers fixed to the optical element; and
on each of the dielectric elastomers, first and second electrodes provided on first and second surfaces of the dielectric elastomer, respectively, wherein the dielectric elastomer is deformed in accordance with application of a voltage across the first and second electrodes to move the optical element, and
wherein:
the light source includes a laser light source,
the projection apparatus further comprises a microlens array, disposed between the noise reduction mechanism and the image display element, to convert the light beam into a light beam having a substantially uniform intensity distribution,
the noise reduction mechanism includes the three or more dielectric elastomers fixed to the optical element, and three or more current-carrying circuits to apply voltages to the three or more dielectric elastomers, respectively, and
the three or more current-carrying circuits repeatedly turn on and off the application of the voltages to the three or more dielectric elastomers in order so that the optical element is repeatedly inclined relative to an optical axis and a beam spot formed on the microlens array is scanned along a closed curve.