WO2019242433A1

WO2019242433A1 - Laser projection device

Info

Publication number: WO2019242433A1
Application number: PCT/CN2019/087065
Authority: WO
Inventors: 李建军
Original assignee: 青岛海信激光显示股份有限公司
Priority date: 2018-06-19
Filing date: 2019-05-15
Publication date: 2019-12-26
Also published as: WO2019242433A8

Abstract

A laser projection device, which comprises a light source casing, a laser array and an optical element. A cavity is formed in the light source casing, and the light source casing comprises a first casing and a second casing. A first light exit hole is formed in the end of the first casing facing the second casing, a first chamber is formed in the first casing, a light entrance hole is formed in the end of the second casing facing the first casing, and a second chamber is formed in the second casing. The partition structure is arranged between the first light exit hole and the light entrance hole, and comprises: a support portion, which is arranged on the second casing and is closer to the first light exit hole than the light entrance hole, the support portion being provided with a mounting through hole that is formed at a position corresponding to the light entrance hole; a first lens, which is fixed in the mounting through hole in a sealing manner; The partition structure divides the cavity into the first chamber and the second chamber, which are independent of each other.

Description

Laser projection equipment

This application is required to be submitted to the Chinese Patent Office on June 19, 2018, with the application number 201810631394.9, entitled "A light source module for a laser TV and a laser projection TV" and to the Chinese Patent Office on June 19, 2018, with the application number 201810628587.9 The priority and rights of the Chinese patent application entitled "A Tri-color Laser Light Source and Laser Projection Television", the entire contents of which are incorporated herein by reference.

Technical field

The present disclosure relates to the field of laser projection technology, and in particular, to a laser projection device and a laser projection device.

Background technique

Laser is a light source with high brightness, strong directivity, and emits a monochromatic coherent light beam. Due to the many advantages of laser, it has been gradually used as a light source in the field of projection display technology in recent years, such as the field of laser projection.

At present, laser projection equipment is mainly composed of an optical engine, a heat dissipation system, and a circuit control system; its core component is the optical engine part. The optical engine part is composed of a light source part and a light machine part. The role of the light source part is to provide illumination for the light machine. The role of the light machine part is to modulate the illumination beam provided by the light source. Finally, the projection image is formed through the lens.

The light source portion of a laser projection device typically includes a light source housing, a laser array, and an optical lens assembly. The light beam emitted by the laser array is shaped and combined by the optical lens assembly, thereby providing illumination for the optical machine. The laser array includes a plurality of devices such as a light emitting chip, a collimating lens, and a wire. Generally, the light emitting chip, a collimating lens, and a plurality of devices such as a wire need to be packaged together for use. Optical lens components include a telescope lens group (also known as a beam reducing lens group, usually consisting of a convex lens and a concave lens), a light combining component, a light pipe, a speckle reducing component, and a fluorescence conversion component. The optical lens component is also usually packaged in Used together.

Summary of the Invention

Some embodiments of the present disclosure provide a laser projection device including a light source housing and a partition structure. A cavity is provided in the light source housing; the light source housing includes a first housing and a second housing; wherein an end of the first housing facing the second housing is provided with a first light emitting hole And a first mounting portion surrounding the first light emitting hole, a first cavity is provided in the first housing; an end of the second housing facing the first housing is provided with a light entering hole and surrounds the first housing; A second mounting portion of the light entrance hole, a second chamber is provided in the second housing; the first light exit hole and the light entrance hole are oppositely disposed, and the first mounting portion and the second mounting portion The sealed connection causes the first chamber and the second chamber to form the cavity together. The partition structure is disposed between the first light exit hole and the light entrance hole, and the partition structure includes a support portion and a first lens; wherein the support portion is disposed on the second housing and is larger than The light entrance hole is closer to the first light exit hole, and a support through hole is provided at a position of the support portion corresponding to the light entrance hole, and an inner peripheral wall of the installation through hole and an inner peripheral wall of the light entrance hole are provided. A ring-shaped step is formed at the connection of the first lens; the first lens is fixed on the ring-shaped step, and the first lens is sealedly connected to the ring-shaped step; and the partition structure divides the cavity into mutually independent first sections. A chamber and a second chamber.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without paying creative labor.

1 is a cross-sectional view at a laser light source position of a laser projection device according to some embodiments of the present disclosure;

2 is an exploded view of a first housing and a second housing of a light source housing in a laser light source according to some embodiments of the present disclosure;

3 is an exploded view of a second housing, a first lens, and a fixing member in a laser light source according to some embodiments of the present disclosure;

FIG. 4 is a partially enlarged view of the first lens position in FIG. 1; FIG.

5 is a schematic assembly diagram of a first lens and a fixing member in a laser light source according to some embodiments of the present disclosure;

FIG. 6 is an enlarged view of the position of the light-entry hole in the second casing in FIG. 3; FIG.

7 is an exploded view of a first housing and a laser array according to some embodiments of the present disclosure;

8 is a schematic structural diagram of a laser light source position in a laser projection device according to some embodiments of the present disclosure;

9 is a schematic diagram of an optical path structure of the laser light source shown in FIG. 1;

FIG. 10 is a schematic diagram of a laser projection apparatus according to some embodiments of the present disclosure.

detailed description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, but not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present disclosure.

In the description of this disclosure, it needs to be understood that the terms “center”, “up”, “down”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, The orientations or positional relationships indicated by "top", "bottom", "inside", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply The device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure.

The terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, unless otherwise stated, "a plurality" means two or more.

In the description of this disclosure, it should be noted that the terms "installation", "connected", and "connected" should be understood in a broad sense unless explicitly stated and limited otherwise. For example, they may be fixed connections or removable. Connected or connected integrally; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this disclosure may be understood on a case-by-case basis.

At present, the laser light sources commonly used in laser projection equipment are mostly monochromatic laser light sources or two-color laser light sources. Among the three primary colors forming white light, one or two primary colors are lasers, and the other primary colors are composed of fluorescence. The generation of fluorescence requires a fluorescence conversion member. The fluorescence conversion member is usually a fluorescent wheel assembly. The fluorescence conversion member is excited by laser light to generate fluorescence.

FIG. 1 illustrates a laser light source of a laser projection device according to some embodiments of the present disclosure. The laser light source is configured to provide laser light to an imaging element in the laser projection device. In some embodiments, the imaging element may be a digital micromirror.

In some embodiments, the laser light source is a three-color laser light source, that is, the three primary colors for imaging are provided by the laser, so there is no need to use a fluorescence conversion component. As shown in FIG. 1, the laser light source includes a light source housing 2, a laser array 4, and an optical element 5.

As shown in FIG. 2, the light source housing 2 includes a first housing 2A and a second housing 2B connected to each other. The first casing 2A and the second casing 2B are detachably and sealedly connected by a sealing structure. The first casing 2A is provided with a first mounting portion 2a, and the second casing 2B is provided with a second fitting portion that cooperates with the first mounting portion 2a. The mounting portion 2b, the first mounting portion 2a, and the second mounting 2b are respectively provided with screw holes and are connected by screws; or they can also be snap-connected.

A first light emitting hole 20a is provided at an end of the first housing 2A facing the second housing 2B, and a light incident hole 20b is provided at a position corresponding to the second housing 2B and the first light emitting hole 20a. 20b is configured to receive light emitted from the first light emitting hole 20a. The first mounting portion 2a is disposed around the first light emitting hole 20a, the second mounting portion 2b is disposed around the light incident hole 20b, and a sealing ring is provided between the first mounting portion 2a and the second mounting portion 2b, and the sealing ring is configured as The gas is prevented from entering the first light exit hole 20a or the light entrance hole 20b from the gap between the first mounting portion 2a and the second mounting portion 2b. The first casing 2A and the second casing 2B are hermetically connected together by a first mounting portion 2a, a second mounting portion 2b, and a seal ring. As a result, the structure of the light source housing 2 is simplified, thereby simplifying the processing process of the light source housing 2 and further reducing the cost of the laser light source.

In some embodiments of the present disclosure, as shown in FIG. 3, the cavity 1 of the light source housing 2 of the above-mentioned laser light source is provided with a partition structure 3, and the partition structure 3 divides the cavity 1 into first and second chambers which are not connected to each other. 11 和第二室 12. The first chamber 11 is a chamber corresponding to the laser array on the first housing, and the second chamber 12 is a chamber located in the second housing.

In some embodiments, the partition structure 3 includes a first lens 31 and a support portion 32. The support portion 32 is located at an end of the light incident hole 20 b of the second housing 2B and extends along the radial direction of the light incident hole 20 b. The support portion 32 A first mounting through hole 322 is provided at a position corresponding to the light incident hole 20b. An annular step is formed at the connection between the inner peripheral wall of the first mounting through hole 322 and the inner peripheral wall of the light incident hole 20b, and the first lens 31 is fixed in a ring shape. On the steps, the cavity 1 is isolated into a first cavity 11 and a second cavity 12 which are not connected to each other. In some embodiments, the separation structure 3 may also include only the first lens.

In some embodiments, the second housing 2B is provided with a support portion 32 at an end of the light incident hole 20b near the first housing 2A, and the support portion 32 is provided around the end of the light incident hole 20b and is connected to the second mounting portion. 2b and the inner peripheral wall of the end of the light entrance hole 20b, the second mounting portion 2b is provided around the support portion 32, and the planes where the first mounting portion 2a and the second mounting portion 2b are located and the plane where the support portion 32 is located are stepped To form a space for accommodating the light-emitting surface of the first lens 31.

In some embodiments, the second housing 2B is provided with a support portion 32 at an end of the light incident hole 20b near the first housing 2A, and the support portion 32 is provided around the end of the light incident hole 20b and is connected to the second mounting portion. 2b and the inner peripheral wall of the end of the light incident hole 20b, the second mounting portion 2b is provided around the support portion 32, and the second mounting portion 2b and the support portion 32 are located on the same plane.

Referring to FIG. 4, the supporting portion 32 and the second casing 2B are integrally formed. Of course, the support portion 32 may also be hermetically connected to the second casing 2B. For example, the support portion 32 and the second casing 2B are hermetically connected together by welding or welding. The supporting portion 32 is integrally formed with the second casing 2B, so that the processing of the supporting portion 32 and the light source casing 2 is more convenient.

Referring to FIG. 4, the first lens 31 includes two opposite light-transmitting surfaces and a side surface between the two opposite light-transmitting surfaces. The first mounting through-hole 322 includes an inner peripheral wall. A small glue groove 321 is provided at a position corresponding to one side of the side surface of the first lens 31, and a sealant is fitted in the glue groove 321, and the sealant is adhered to the side surface of the first lens 31 to make the first lens 31 Sealed connection with the first mounting through hole 322.

In some embodiments, referring to FIGS. 3 to 6, an annular step 323 is further provided at the connection between the inner peripheral wall of the first mounting through hole 322 and the inner peripheral wall of the light incident hole 20 b. The annular step 323 may include a first step 323. A step. The first step is composed of a first step surface along a radial direction of the light entrance hole 20b and a first vertical surface along an axial direction of the light entrance hole 20b. The light exit surface of the first lens abuts on the first step surface. At least a part of an inner peripheral wall of the mounting through hole forms the first vertical surface. The first vertical surface is in contact with a side surface of the first lens 31, and the first step surface is in contact with an edge portion of a light transmitting surface (light emitting surface) of the first lens 31.

In some embodiments, as shown in FIG. 4, the annular step 323 includes a first step and a second step. The first step includes a first step surface along the light entrance aperture and a first step along the axial direction of the light entrance aperture. The vertical plane is formed, and the second step is formed by a second step plane along a radial direction of the light incident hole 20b and a second vertical plane along an axial direction of the light incident hole 20b. The diameter of the ring where the first step is located is smaller than the diameter of the ring where the second step is located. The first step is formed by the first step surface and a first vertical surface parallel to the optical axis direction of the first lens 31. The light-emitting surface of the first lens is in contact with the first step surface. The first vertical surface and the side surface of the first lens Phase contact. The second step includes a second vertical plane and a second step plane parallel to the first step plane. The second step plane is located between the second vertical plane and the first vertical plane, that is, the second vertical plane and Between the side surfaces of the first lens, the second vertical surface, the second stepped surface, and a part of the side surface of the first lens surround a dispensing groove 321.

Referring to FIGS. 3 to 5, in some embodiments, the partition structure 3 further includes a fixing member 33 disposed at a light incident surface of the first lens 31. The fixing member 33 includes a fixing portion 331 and a plurality of blocking pieces 332 provided on the fixing portion 331. In some embodiments, the fixing portion 331 is provided with a first through hole 330 at a position corresponding to the first mounting through hole, and the blocking piece 332 extends from the fixing portion 332 toward the center of the first through hole 330.

The fixing portion 331 is provided with a mounting hole, and the screw fixes the fixing portion 331 to the support portion 32 through the mounting hole. The fixing portion 331 has a first through hole 330 to allow the light incident surface of the first lens 31 to pass through. The first through hole is exposed, so that the fixing portion 331 surrounds the periphery of the light incident surface of the first lens 31.

The plurality of blocking pieces 332 are disposed around the first through hole, and all of them are in contact with an edge portion of the light incident surface of the first lens 31. The plurality of blocking pieces 332 apply a force to the first lens 31 toward the first step surface of the annular step 323 to make the first lens 31 abut against the first step surface.

The plurality of blocking pieces 332 of the fixing member 33 and the fixing portion 331 are integrally formed, which improves the structural integrity of the plurality of blocking pieces 332 and facilitates the assembly of the fixing member 33 and the supporting portion 32.

The plurality of blocking pieces 332 can be deformed under the action of force. The plurality of blocking pieces 332 and the fixing portion 331 are integrally formed, and are all made of metal. During installation, the plurality of blocking pieces 332 are crimped to the edge portion of the light incident surface of the first lens 31. When the fixing portion 331 is fixed to the supporting portion 32, the plurality of blocking pieces 332 and the first lens 31 The edge portion of the light incident surface is in elastic contact, and a deformation amount of about 0.2 mm occurs in the plurality of blocking pieces 332. The magnitude of the deformation amount is related to the material of the plurality of blocking pieces 332 and the required fixed pressure.

The plurality of blocking pieces 332 may be in point contact, line contact, or surface contact with the light incident surface of the first lens 31. Because the contact surfaces of the plurality of blocking pieces 332 and the light incident surface of the first lens 31 need to be just right during surface contact. Therefore, the accuracy of the contact surface is high, and the processing is difficult. In order to reduce the processing difficulty, the plurality of blocking pieces 332 are in point or line contact with the light incident surface of the first lens 31. When installing the first lens 31, first place the first lens 31 in the first mounting through-hole 322 on the support portion 32, then inject the liquid glue along the dispensing tank 321, then place it in the oven for drying, and finally fix it by Piece 33 is limited.

In some embodiments, the support portion 32 is provided with a screw hole, the fixing portion 331 is provided with a mounting hole for passing a screw, and the fixing portion 331 is fixed on the support portion 32 by a screw.

The light source housing 2 is divided into a first chamber 11 and a second chamber 12 which are not connected to each other, so that the first chamber 11 and the second chamber 12 can be sealed independently, for example, for installing a second optical The second chamber 12 of the element 5 is hermetically sealed, and the first chamber 11 in which the laser array 4 is installed is sealed with a lower degree of dustproofness. At this time, the first lens 31 and the support portion 32, and the first mounting portion 2a and the second housing 2B must be hermetically sealed with a high sealing level.

In some embodiments, as shown in FIG. 1, the first chamber 11 has two left and right sub-chambers (corresponding to the first and second sub-housings of the first housing 2A). In some embodiments, the first chamber 11 may also be a single chamber.

1, 7 and 8: The first case 2A includes a first sub case and a second sub case, and the first sub case and the second sub case are integrally formed to form a first case. Body 2A, the first sub-shell and the second sub-shell each include a top surface provided with a light outlet (that is, a surface of the first sub-shell and the second sub-shell opposite to the second shell 2B Top surface) and a bottom surface opposite to the top surface, and a plurality of side walls connecting the top surface and the bottom surface. The first and second sub-chambers share a common sidewall.

In some embodiments, referring to FIG. 7, the first housing 2A is further provided with a plurality of second mounting through holes 21 for mounting the laser array 4 and the light combining component, and each second mounting through hole 21 is provided at There is a sealing structure 22 to achieve a dust-proof seal of the first chamber 11 and an air-tight seal of the second chamber 12. The sealing structure 22 is a sealing ring in some embodiments.

Referring to FIG. 8, the light source housing 2 is further provided with a filter 6 capable of communicating the inside of the light source housing 2 with the outside. The filter 6 is an air-tight filter valve, and the temperature inside the second chamber 12 rises. At the same time, the filter valve realizes the gas exchange between the inside of the light source housing and the outside world, and balances the air pressure inside the light source housing 2 with the outside air pressure, thereby ensuring the reliability of the optical element 5. The filter valve 6 can also be used for gas exchange. At the same time, the dust from the outside with extremely small particles is blocked from entering the interior of the chamber, thereby ensuring the airtightness of the second chamber 12.

The laser array 4 includes a red laser array 41, a green laser array 42, and a blue laser array 43. Each color laser array includes one or more lasers.

A green laser array 42 is provided on the bottom surface and the first side wall of the first sub-casing, and a blue laser array 43 is provided on the second side wall of the first sub-case opposite to the first side wall. The third side wall and the bottom surface of the casing are respectively provided with a red laser array 41, and each laser array is fixed to a corresponding position of the first casing 2A by a connecting member such as a screw. The first sub-housing and the second sub-housing are provided with second mounting through holes 21 at positions corresponding to respective laser arrays, so that a laser array is installed and the light beams emitted by each laser array can be incident into the first chamber 11 . Each laser array 4 and the corresponding second mounting through hole 21 are dust-tightly sealed by a sealing ring (which may be made of fluororubber or other sealing materials).

The optical element 5 includes a first lens 31 and a second optical lens assembly. The optical path structure formed by the laser light source by using the optical element 5 is shown in FIG. 9. The laser light emitted from the laser array 4 in the first sub-chamber passes through the first light combining lens 44 and the first light is emitted to the first lens 31 corresponding to the first light, and the first light is emitted from the first lens corresponding to the first light. After 31 exits, it passes through the concave lens 51 corresponding to the first light, and is then reflected by the reflector 52 to the back of the third light combiner. The laser light emitted by the laser array in the second sub-cavity passes through the second light combiner 45 and the red light is combined. The light is emitted to the first lens 31 corresponding to the red light. After the red light is emitted from the first lens 31 corresponding to the red light, the concave lens 51 corresponding to the red light is emitted to the front of the third light combiner, and the third light combiner projects the first The light reflects red light, so the red light emitted from the third beam combiner and the first light are emitted toward the light pipe 54. Since the blue-green laser array emits light in a time-division manner, the first light is blue light at the first time and The second moment is green.

The first lens 31 is disposed between the first chamber 11 and the second chamber 12. The first lens 31 includes at least a convex lens 31. The light-transmitting surface of the convex lens 31 is generally large in size, and is disposed near the light output of the laser array. The first lens 31 can receive a large-area laser beam, and is also convenient for transmitting light as a large window. To reduce light loss.

The second optical lens component is located in an optical path of the first lens 31. The second optical lens assembly includes at least a concave lens 51, a reflecting mirror 52, and a third light combining mirror 53 (dichroic mirror). The light combining component includes a first light combining mirror 44 (a dichroic mirror or a reflecting mirror group disposed at intervals) and a second light combining mirror 45 (X light combining mirror). The first lens constitutes a part of the partition structure, the second optical lens component is located in the second cavity, and the light combining component is located in the first cavity.

The first light combining mirror 44 is provided inside the second sub-housing of the first housing 2A, and the second light combining lens 45 is provided inside the first sub-housing of the first housing 2A. The plurality of laser lights emitted by the red laser array 41 are combined by the first light combining mirror 44 to form a beam of light, and are emitted to the first lens 31 on the right side in FIG. 1; the green laser array 42 and the blue laser array 43 emit The plurality of laser beams are combined by the second light combining lens 45 to form a beam of light, and the light is emitted to the first lens 31 on the left side in FIG. 1. As shown in Figures 1 and 9, the two beams of light are emitted in parallel.

The concave lens 51 is located on the exit light path of the convex lens 31 and forms a beam-reducing lens group (telescope lens group) with the convex lens 31. That is, the first light corresponds to a beam-reducing lens group, and the red light corresponds to a beam-reducing lens group. The beam-reducing lens group can reduce the laser beam of a larger area to form a laser beam of a smaller area. In some embodiments, the concave lens 51 includes a first concave lens corresponding to a first sub-chamber and a second concave lens corresponding to a second sub-chamber.

In some embodiments, the convex lens 31 is close to the light incident surface of the laser array 4, that is, only a light combining element is provided between the convex lens 31 and the laser array 4, and a sealing member such as a sealing glass is not provided. The first cavity is sealed from the light exit side through the contact surface of the first mounting portion and the second mounting portion, and the convex lens in the first mounting portion isolates the first cavity and the second cavity. The convex lens 31 can also be arranged at the combined light output and input surfaces of the multiple groups of laser arrays 4. At this time, the light beam output by the combined light directly enters the convex lens 31, and there is no need to provide other optical components, so the laser array 4 and the convex lens 31 It can be set closer to each other to improve the light collection efficiency of the convex lens 31 and facilitate the compactness and miniaturization of the laser light source architecture.

The reflecting mirror 52 is located on the exit light path of the concave lens 51 corresponding to the first light on the left side in FIG. 1. The reflecting mirror 52 bends the first light by 90 degrees and then exits the third light combining mirror 53.

The third light combining mirror 53 is located on the exit light path of the concave lens 51 corresponding to the red light on the right side in FIG. 1, and forms an angle of 45 ° with the right concave lens 51. The third light combining mirror 53 transmits blue light and green light and reflects red light, and the light emitted from the third light combining mirror is incident into the light pipe 54 in the same direction.

It should be noted that the second mounting through hole 21 for mounting the reflecting mirror 52 and the third light combining mirror 53 can be hermetically sealed by the sealing cover 22 a. In addition, an adjustable screw 7 is provided at a position corresponding to the reflector 52 on the second housing 2B, and a sealing ring and a gland 22b are used to achieve an air-tight seal on the outside of the adjustable screw 7.

The second optical lens assembly further includes a light pipe 54. In order to enter the light pipe 54 to even out the light after the light is combined, the laser beam can be re-converged as needed to ensure that as much light as possible is collected into the light pipe 54 and finally exits from the light pipe 54 to provide the light machine with high quality. Lighting.

In some embodiments, the second optical lens assembly may further include a dispersing spot component, etc., for reshaping and combining the laser beam to meet the requirements of the lighting system. In a single-color or two-color light source system, the second optical lens component may further include a fluorescent wheel, which is used as a fluorescence conversion component, and is generally used to generate primary color light other than the laser color among the three primary colors.

It can be understood that the above description is only based on the three-color laser light source. When the laser light source is a two-color laser light source or a single-color laser light source, the above structure can be adaptively improved. For example, the first cavity is a cavity, and the convex lens is also Just one piece.

In the laser light source provided by some embodiments of the present disclosure, the light source housing 2 is divided into a first chamber 11 and a second chamber 12 which are not connected to each other, so that the first chamber 11 and the second chamber 12 can be independent of each other. For example, the second chamber 12 of the concave lens 51, the reflecting mirror 52, and the third light combining mirror 53 (which requires higher environmental cleanliness) to which the second optical lens assembly is mounted is hermetically sealed, and The first chamber 11 in which the laser array 4 is installed is sealed with a lower dustproof level, thereby reducing the sealing cost compared with the airtight level sealing of the entire cavity 1.

When the first chamber 11 and the second chamber 12 are separated, the first lens 31 is used to form a partition structure to perform the partition function. There is no need to provide a special partition structure, which reduces the number of components and makes the light source structure. Compact and simplified.

In addition, the laser light sources provided by some embodiments of the present disclosure use red, green, and blue laser arrays to make the laser light source a three-color laser light source. Compared to a single-color or two-color laser light source, the fluorescence conversion component is omitted because Therefore, the number of optical components used in the second optical lens assembly of the laser light source is small, thereby making the structure of the laser light source simple and compact.

Referring to FIG. 10, some embodiments of the present disclosure further provide a laser projection device including a laser light source 10, a light machine 20, a lens 30, the laser light source 10 provides illumination for the light machine 20, and the light machine 20 modulates a light source beam, and The image is output to the lens 30 and projected onto the projection medium 40 to form a projection screen. The laser light source 10 is the above-mentioned laser light source.

In the laser projection device provided by some embodiments of the present disclosure, the light source housing 2 is divided into a first chamber 11 and a second chamber 12 and is not connected to each other, so that the first chamber 11 and the second chamber 12 can be separated from each other. Independently sealed, for example, the second chamber 12 equipped with a concave lens 51, a mirror 52 and a third light combining mirror 53 (which requires higher environmental cleanliness) is hermetically sealed, and the laser array 4 is mounted The first chamber 11 is sealed with a lower dust-proof level, thereby reducing the sealing cost compared with the air-tight sealing of the cavity 1 as a whole.

Other structures and the like of the laser projection device according to the embodiment of the present disclosure are well known to those skilled in the art, and will not be described in detail here.

The above are only specific implementations of the present disclosure, but the scope of protection of the present disclosure is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present disclosure. It should be covered by the protection scope of this disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

A laser projection device includes:

A light source housing, a cavity is disposed in the light source housing, and the light source housing includes:

A first casing and a second casing; wherein,

A first light emitting hole and a first mounting portion surrounding the first light emitting hole are provided at an end of the first housing facing the second housing, and a first cavity is provided in the first housing;

A light-entry hole and a second mounting portion surrounding the light-entry hole are provided at an end of the second casing facing the first casing, and a second chamber is provided in the second casing;

The first light emitting hole and the light entering hole are oppositely disposed, and the first mounting portion and the second mounting portion are sealedly connected so that the first chamber and the second chamber together form the cavity. ;

A partition structure provided between the first light exit hole and the light entrance hole, the partition structure includes:

A support portion provided on the second housing and closer to the first light exit hole than the light entrance hole, and a mounting through hole is provided at a position of the support portion corresponding to the light entrance hole An annular step is formed between the inner peripheral wall of the mounting through hole and the inner peripheral wall of the light incident hole;

A first lens, the first lens is fixed on the annular step, and the first lens is hermetically connected to the annular step;

The partition structure divides the cavity into a first cavity and a second cavity which are independent of each other.
The laser projection apparatus according to claim 1, wherein the first lens includes at least a convex lens.
The laser projection apparatus according to any one of claims 1 or 2, wherein the support portion is provided on a plane along a radial direction of the light incident hole.
The laser projection apparatus according to claim 3, wherein the circular step comprises:

A first step surface along the light entrance aperture and a first vertical surface along the axial direction of the light entrance aperture;

The convex lens includes a light entrance surface, a light exit surface, and a side surface located between the light entrance surface and the light exit surface. The light exit surface abuts on the first step surface, and the first vertical surface is disposed around the side surface. .
The laser projection device according to claim 3, wherein the circular step further comprises:

A second step surface along the light entrance aperture and a second vertical surface along the axis of the light entrance hole, the second step surface connecting one end of the first vertical plane and one end of the second vertical plane, The diameter of the ring formed by the first vertical surface is smaller than the diameter of the ring formed by the second vertical surface;

The width of the first vertical surface in the axial direction of the light-entry hole is smaller than the width of the side surface in the axial direction of the light-entry hole, and the second vertical surface, the second stepped surface, and a part of the side surface surround The synthetic dispensing tank is used for receiving glue to fix the first lens.
The laser projection device according to claim 4, wherein the partition structure further comprises a fixing member, the fixing member comprising:

A fixing portion fixed on the supporting portion, the fixing portion having a first through hole to expose a light incident surface of the convex lens from the fixing member;

A plurality of blocking pieces extending axially from the fixing portion beyond the first through hole, and the plurality of blocking pieces are in contact with the edge portion of the light incident surface of the convex lens, so that the first lens is pressed against the first lens. The first step surface.
The laser projection apparatus according to claim 6, wherein the fixing portion is provided with a mounting hole, and the fixing portion is fixed on the support portion by a screw passing through the mounting hole.
The laser projection apparatus according to claim 1, wherein the laser light source further comprises a laser array, the laser array is disposed on the first housing, and the laser array is configured to face the first cavity Emitted light.
The laser projection apparatus according to claim 8, wherein the first chamber includes a first sub-chamber and a second sub-chamber, and the laser array includes a red laser array, a green laser array, and a blue laser array, The green laser array and the blue laser array are disposed on a side wall of a first housing corresponding to a first sub-chamber, and the red laser array is disposed on a side of a first housing corresponding to a second sub-chamber On the wall.
The laser projection apparatus according to claim 9, wherein:

The first sub-chamber and the second sub-chamber are respectively provided with a first lens;

A first light combining element is disposed in the first sub-cavity, and the first light combining element is configured to make the green light emitted by the green laser array and the blue light emitted by the blue laser from the first sub-cavity. The first lens corresponding to the cavity is transmitted;

The red laser array includes two red laser arrays, and a second light combining element is disposed in the second sub-cavity. The second light combining element is configured to make red light emitted by the two red laser arrays from A first lens corresponding to the second sub-chamber emits light.
The laser projection apparatus according to claim 9, wherein:

The second housing is provided with a second light emitting hole, and the laser projection device is provided with a light pipe in a light emitting direction of the second light emitting hole;

A first concave lens is further provided in the second cavity in the light emission direction of the first sub-chamber, and a reflector is also provided in the optical axis direction of the first concave lens, and the reflector is configured as Reflecting blue light or green light emitted by the first concave lens;

A second concave lens is further provided in the second cavity in the light exit direction of the second sub-chamber, and a third light combining element is further provided in the optical axis direction of the second concave lens. The light combining element is configured to reflect red light emitted from the second concave lens toward the second light emitting hole, and transmit blue light or green light reflected by the mirror.
The laser projection apparatus according to claim 1, wherein:

The first chamber is hermetically sealed and the second chamber is hermetically sealed.