# US 2020/0401027 A1 · Laser projection apparatus

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- Number: US 2020/0401027 A1
- Document ID: US20200401027A1
- Status: Published application
- Kind: A1
- Application number: 16/820,382
- Filed: 2020-03-16
- Published: 2020-12-24
- Earliest claimed: 2019-06-20
- Assignees: Hisense Laser Display Co., Ltd
- Applicants: Hisense Laser Display Co., Ltd.
- Inventors: Yun ZHAO; Xintuan TIAN
- Web page: https://patentgrep.com/patent/US20200401027A1

## CPC

- G03B 21/2033: {LED or laser light sources}
- G02B 27/48: Laser speckle optics
- G03B 21/145: {Housing details, e.g. position adjustments thereof}
- G03B 21/16: Cooling; Preventing overheating
- G03B 21/20: Lamp housings
- G03B 21/2046: {Positional adjustment of light sources}
- G03B 21/2073: {Polarisers in the lamp house (peculiar to electronic spatial light modulators H04N9/3197)}
- G03B 21/28: Reflectors in projection beam {(in illumination beam G03B21/2066)}
- G03B 33/08: Sequential recording or projection (G03B33/02, G03B33/04, G03B33/06 take precedence)
- 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

## Abstract

The present disclosure describes embodiments of a laser projection apparatus. The laser projection apparatus includes: an apparatus housing, a laser source system disposed in the apparatus housing, and the laser source system including a first laser outlet; an optical engine disposed in the apparatus housing, and the optical engine including a second laser inlet and a third laser outlet, and the second laser inlet being connected to the first laser outlet; a lens system disposed in the apparatus housing, and one end of the lens system extending to the third laser outlet; and at least one circuit board. The lens system and the optical engine are disposed along a first direction of the apparatus housing to divide space in the apparatus housing into a first region and a second region. The first region is at a first side of the lens system and the optical engine, and the laser source system is in the first region. The second region is at a second side of the lens system and the optical engine, and the at least one circuit board is in the second region.

## Claims

### Claim 1

A laser projection apparatus, comprising:
an apparatus housing;
a laser source system disposed in the apparatus housing and comprising a first laser outlet;
an optical engine disposed in the apparatus housing and comprising a second laser inlet and a third laser outlet, wherein the second laser inlet is connected to the first laser outlet;
a lens system disposed in the apparatus housing, wherein one end of the lens system extends into the third laser outlet;
at least one circuit board; wherein,
the lens system and the optical engine are disposed along a first direction of the apparatus housing to divide space in the apparatus housing into a first region and a second region;
the first region is at a first side of the lens system and the optical engine, and the laser source system is in the first region; and
the second region is at a second side of the lens system and the optical engine, and the at least one circuit board is in the second region.

### Claim 2 (depends on 1)

The laser projection apparatus according to claim 1, wherein the laser source system comprises:
a laser source housing, wherein the laser source housing comprises a top cover and a bottom wall, and a plurality of side walls between the top cover and the bottom wall, and the first laser outlet is on one of the side walls;
a red laser assembly installed on a first side wall of the plurality of side walls, wherein a laser-emitting surface of the red laser assembly faces the first laser outlet;
a blue laser assembly installed on a second side wall of the plurality of side walls, wherein the second side wall and the first side wall are perpendicular to each other; and
a green laser assembly, wherein the green laser assembly and the blue laser assembly are installed side by side on the second side wall.

### Claim 3 (depends on 2)

The laser projection apparatus according to claim 2, wherein each laser assembly outputs a rectangular laser spot; and a long side of the rectangular laser spot correspondingly output by each laser assembly is perpendicular to the bottom wall of the laser source housing.

### Claim 4 (depends on 2)

The laser projection apparatus according to claim 2, wherein the laser source housing comprises:
a first opening,
a second opening, and
a third opening;
the laser source system further comprises:
a first fixed support connected to the red laser assembly and the laser source housing, so that the red laser assembly is installed at the first opening;
a second fixed support connected to the blue laser assembly and the laser source housing, so that the blue laser assembly is installed at the second opening; and
a third fixed support connected to the green laser assembly and the laser source housing, so that the green laser assembly is installed at the third opening.

### Claim 5 (depends on 4)

The laser projection apparatus according to claim 4, wherein at least one of the first fixed support, the second fixed support or the third fixed support comprises a first accommodating groove; and
the laser source housing further comprises at least one second accommodating groove, each of which is located at a corresponding one of the first opening, the second opening, or the third opening;
the laser source system further comprises:
at least one first sealing member, each of which is located in a corresponding first accommodating groove;
at least one second sealing member, each of which is located in a corresponding second accommodating groove; and
at least one sealing glass, each of which is located between a corresponding first sealing member and a corresponding second sealing member.

### Claim 6 (depends on 4)

The laser projection apparatus according to claim 4, wherein at least one of the first fixed support, the second fixed support, or the third fixed support comprises:
a support body configured to be able to be installed on the laser source housing, wherein a middle portion of the support body comprises a laser-transmissive opening, and a back side of the support body comprises a laser assembly mounting position;
an opening frame disposed at the laser-transmissive opening; and
a third sealing member disposed in the laser assembly mounting position to seal a connection portion between the support body and a corresponding laser assembly in a case where the corresponding laser assembly is installed on the support body.

### Claim 7 (depends on 2)

The laser projection apparatus according to claim 2, wherein the laser source system further comprises:
a first laser combining lens in the laser source housing, disposed to be inclined toward the laser-emitting surface of the green laser assembly or the laser-emitting surface of the blue laser assembly, and configured to reflect a green laser beam emitted by the green laser assembly or a blue laser beam emitted by the blue laser assembly;
a second laser combining lens in the laser source housing, disposed to be inclined toward the laser-emitting surface of the blue laser assembly or the laser-emitting surface of the green laser assembly, and located at a junction of the green laser beam and the blue laser beam; the second laser combining lens is configured to transmit the blue laser beam and reflect the green laser beam, or is configured to transmit the green laser beam and reflect the blue laser beam; and
a third laser combining lens in the laser source housing, disposed to be inclined toward a laser-emitting surface of the red laser assembly, and located at a junction of a red laser beam emitted by the red laser assembly and both the blue laser beam and the green laser beam propagating from the first laser combining lens and second laser combining lens; the third laser combining lens is configured to transmit the red laser beam, and reflect the blue laser beam and the green laser beam, so that the red laser beam, the blue laser beam and the green laser beam are directed toward the first laser outlet.

### Claim 8 (depends on 7)

The laser projection apparatus according to claim 7, wherein the first laser combining lens, the second laser combining lens and the third laser combining lens are installed on the bottom wall of the laser source housing, and an inclination angle of each laser combining lens is able to be fine-tuned within in a range of plus or minus 3 degrees.

### Claim 9 (depends on 2)

The laser projection apparatus according to claim 2, wherein the laser source system further comprises one of the following:
a first phase retarder and a second phase retarder, the first phase retarder disposed in a laser path of a blue laser beam emitted by the blue laser assembly and configured to change a polarization direction of the blue laser beam, the second phase retarder disposed in a laser path of a green laser beam emitted by the green laser assembly and configured to change a polarization direction of the green laser beam; or
a third phase retarder disposed in a laser path of a red laser beam emitted by the red laser assembly and configured to change a polarization direction of the red laser beam; wherein,
any one of the first phase retarder, the second phase retarder or the third phase retarder is disposed on the laser source housing in one of the following manners:
a phase retarder is disposed in the laser source housing;
a phase retarder is disposed on an inner side of an opening for installing a corresponding laser assembly on the laser source housing; or
a phase retarder is disposed between an outer side of an opening for installing a corresponding laser assembly on the laser source housing and the corresponding laser assembly.

### Claim 10 (depends on 2)

The laser projection apparatus according to claim 2, wherein at least one of the red laser assembly, the blue laser assembly, or the green laser assembly comprises:
a laser body, wherein the laser body comprises pins; and
a circuit board, wherein the circuit board comprises a hollow region, the hollow region accommodates the laser body, and the pins of the laser body are soldered onto the circuit board.

### Claim 11 (depends on 7)

The laser projection apparatus according to claim 7, wherein the laser source system further comprises one of the following:
a homogenizing element disposed in a laser path from the third laser combining lens to the first laser outlet; and a converging lens group disposed in a laser path from the homogenizing element to the first laser outlet; or
a homogenizing element disposed in a laser path from the third laser combining lens to the first laser outlet; a converging lens group disposed in a laser path from the homogenizing element to the first laser outlet; and a diffusion wheel disposed in a laser path from the converging lens group to the first laser outlet.

### Claim 12 (depends on 7)

The laser projection apparatus according to claim 7, wherein the laser source system further comprises a half-wave plate, and the half-wave plate is arranged in any one of the following manners:
the half-wave plate is disposed in the laser source housing, and is located between a laser assembly and a corresponding laser combining lens;
the half-wave plate is disposed on an inner side wall of an opening corresponding to a laser assembly on the laser source housing; or
the half-wave plate is disposed on an outer side wall of an opening corresponding to a laser assembly on the laser source housing.

### Claim 13 (depends on 11)

The laser projection apparatus according to claim 11, wherein the optical engine comprises:
a laser pipe located at a front end of the optical engine, wherein a laser-entry surface of the laser pipe is a focal plane of the converging lens group, and the laser-entry surface of the laser pipe is approximately within a range of 1.5 mm to 3 mm away from a wheel surface of the diffusion wheel;
a laser modulator configured to receive laser beams transmitted by the laser pipe, modulate the laser beams and enable modulated laser beams to be incident to the lens system.

### Claim 14 (depends on 13)

The laser projection apparatus according to claim 13, wherein the optical engine further comprises:
a vibrating lens located between the laser modulator and the lens system; the vibrating lens is configured to be able to perform a one-dimensional vibration at upper and lower positions or at left and right positions, or perform a two-dimensional vibration at upper, lower, left and right positions, so as to enable laser beams transmitted through the vibrating lens to generate angular displacements.

### Claim 15 (depends on 1)

The laser projection apparatus according to claim 1, wherein the lens system comprises an ultra-short-focus projection lens with a projection ratio of less than 0.3.

### Claim 16 (depends on 1)

The laser projection apparatus according to claim 1, wherein the at least one circuit board comprises at least one of: a display circuit board, a signal circuit board, a power circuit board or a control circuit board.

### Claim 17 (depends on 2)

The laser projection apparatus according to claim 2, further comprising: a first heat dissipation device configured to dissipate heat of the red laser assembly, and a second heat dissipation device configured to dissipate heat of the blue laser assembly and the red laser assembly; wherein,
the first heat dissipation device comprises:
a cooling head configured to be in contact with the red laser assembly;
a cooling drain configured to be away from the red laser assembly; and
a pipe connecting the cooling head and the cooling drain, so that a cooling medium in the pipe is circulated between the cooling head and the cooling drain;
the second heat dissipation device comprises:
a heat conduction block configured to be in contact with the blue laser assembly and the green laser assembly;
heat dissipation fins configured to be away from the blue laser assembly and the green laser assembly; and
a heat pipe, wherein a hot end of the heat pipe is in contact with the heat conduction block, a cold end of the heat pipe is in contact with the heat dissipation fins, and the heat pipe is a closed pipe with liquid inside.

### Claim 18 (depends on 17)

The laser projection apparatus according to claim 17, wherein,
the first heat dissipation device is located at a side of the laser source system away from the optical engine and the lens; and
the second heat dissipation device is arranged side by side with the laser source system along the first direction, so that in a direction perpendicular to the first direction, a first side of the heat dissipation fins faces the cooling drain, and a second side of the heat dissipation fins faces the lens system.

### Claim 19 (depends on 18)

The laser projection apparatus according to claim 18, further comprising:
a first fan located between the cooling drain and the heat dissipation fins, or located at a side of the cooling drain away from the heat dissipation fins; and
a second fan located on a side of the at least one circuit board away from the optical engine and the lens; wherein,
the second fan configured to drive air to flow through the optical engine and the at least one circuit board to form one heat dissipation path; and
the first fan and the second fan configured to jointly drive air to sequentially flow through the cooling drain, the heat dissipation fins, the lens and the at least one circuit board to form another heat dissipation path.

### Claim 20 (depends on 19)

The laser projection apparatus according to claim 19, further comprising at least one of the following:
a third fan located between the heat dissipation fins and the lens system; or
a fourth fan located at a position of the optical engine.