Coaxial synthesis light source module of off-axis array packaging light source and corresponding optical-mechanical system

Abstract

The invention belongs to the technical field of light source modules, and provides a coaxial synthesis light source module of an off-axis array packaging light source and a corresponding optical-mechanical system. The optical axes of all the light sources are refracted by the collimating optical lens, then obliquely enter the corresponding dichroscopes, and are reflected by the corresponding dichroscopes to be synthesized on the same optical axis, so that the optical paths of the light sources of two colors packaged in an off-axis array can be synthesized into a coaxial optical path; and an optical-mechanical system formed by the coaxial synthesis light source module is efficient and compact.

Description

Technical Field

[0001] The present invention relates to the technical field of light source modules, and in particular to a coaxial synthetic light source module of an off-axis array packaged light source and a corresponding optical-mechanical system. Background Art

[0002] The optical projection engine generally includes a light source, a micro display panel and a projection lens. The R, G, B mixed light lighting system evenly illuminates the digital micro display panel, and then the color image of the digital micro display panel is projected onto the wall or display medium through the projection lens.

[0003] Typically, a high optical efficiency optical projection engine architecture includes three optical channels, each of which contains a color light source and a set of collimating optical devices, which makes the entire device larger and unsuitable for some application systems, such as near-eye projection systems like AR / VR and helmet displays, mobile phone projection, embedded projection display screens like smart appliances and robot projection displays, and small projection lamps.

[0004] In order to meet the compact size requirements of the optical projection engine in some of the above application scenarios, a two-channel or single-channel projection engine architecture is an optional setting. Under the single-channel or dual-channel architecture, multiple color light-emitting chips often need to be packaged on the same substrate, and then the dichroic mirror is used to synthesize the light paths of multiple colors into the coaxial light path to achieve high light efficiency. Usually, the light-emitting chips of multiple colors are arranged in parallel along the optical axis, and the dichroic mirror also has a certain inclination along the direction of the optical axis, so that multiple colors can be synthesized on the same optical axis. However, since the micro-display panel usually has a certain aspect ratio, such as a 16:9 rectangular shape, the light-emitting chip also needs to be arranged in a certain proportion of rectangular light-emitting surface to match the optical extension of the micro-display panel. However, if the chips with rectangular light-emitting surfaces are arranged and packaged with the short sides adjacent to each other along the optical axis, the two chips will be separated by a larger distance, which will affect the efficiency of synthesis, and the aperture of the collimating lens will be larger. Therefore, in order to reduce the aperture of the collimating lens and to improve the efficiency of synthesis to the coaxial light path, the design of off-axis array packaging with two or more light-emitting chips adjacent to each other on the long sides will have higher light efficiency. Therefore, in the application scenarios of micro-projection, there is an urgent need for a projection optical engine architecture that can synthesize the light source of the off-axis array package into a coaxial synthesized illumination light source to improve the synthesis efficiency while reducing the size of the optical system. Summary of the invention

[0005] The object of the present invention is to provide a coaxial synthesis light source module of off-axis array packaged light sources, so as to solve the problems of low synthesis efficiency and large size of existing lighting light sources.

[0006] The present invention provides a coaxial synthetic light source module of an off-axis array packaged light source, comprising at least:

[0007] At least two light sources of two colors are packaged off-axis on the same substrate, and each light source of the two colors has a corresponding optical axis;

[0008] a collimating optical lens; and

[0009] at least two dichroic mirrors with spatial deflection angles;

[0010] Wherein, each of the dichroic mirrors corresponds to one of the light sources, and each of the dichroic mirrors reflects light of one color;

[0011] Wherein, the dichroic mirror has an inclination angle of 45 degrees along the direction of the optical axis of the illumination system and a preset inclination angle along the arrangement direction of the array light source;

[0012] The optical axes of all the light sources are refracted by the collimating optical lens and then obliquely incident on the corresponding dichroic mirrors, and then reflected by the corresponding dichroic mirrors and synthesized onto the same optical axis.

[0013] The coaxial synthetic light source module of the above-mentioned off-axis array packaged light source can synthesize the light paths of the two colors of light sources in the off-axis array package into one coaxial light path by refracting the optical axes of all the light sources through the collimating optical lens and then obliquely incident on the corresponding dichroic mirrors, and synthesizing them onto the same optical axis after reflection by the corresponding dichroic mirrors, so that the optical paths of the two colors of light sources in the off-axis array package can be synthesized into one coaxial light path, so that the optical-mechanical system formed by this coaxial synthetic light source module is efficient and compact.

[0014] Furthermore, the range of the preset inclination angle is.

[0015] Furthermore, the light emitting chips of at least two of the light sources are rectangular in shape, and the at least two light sources are arranged on the off-axis package with the long sides of the light emitting chips adjacent to each other, and the at least two light sources include a red light source and a blue light source.

[0016] Furthermore, at least two of the light sources include a green light source:

[0017] The red light source and the blue light source are packaged on the same copper substrate, wherein the light emitted by the red light source and the blue light source along their respective optical axes is refracted by the same collimating lens, obliquely incident on the corresponding dichroic mirror, and then reflected by the corresponding dichroic mirror to synthesize mixed light on the same optical axis; wherein the dichroic mirror is used to transmit light of one color and reflect light of another color;

[0018] The green light source is packaged on a copper substrate, and the emitted light passes through the corresponding dichroic mirror and overlaps with at least two coaxial color lights, red light and blue light, reflected from the other two dichroic mirrors to form coaxial mixed illumination light.

[0019] Furthermore, at least two of the light sources include a green light color, wherein the green light color light emitting chip is packaged on the central optical axis of the copper substrate, and the light emitting chips of the red light source and the blue light source are packaged off-axis above and below the green light emitting chip; the red light, green light, and blue light sources respectively emit light along their respective optical axes, which are refracted by the same collimating optical lens and incident on the three dichroic mirrors, wherein the green light is incident on the green light dichroic mirror placed in the middle at 45 degrees to the optical axis of the lighting system and then reflected at 90 degrees, the red light or the blue light is obliquely incident on the dichroic mirror with a spatial deflection angle placed in front of the green light dichroic mirror along the arrangement direction of the array light sources, and coincides with the green light optical axis after reflection, and the light of the third color is obliquely incident on the dichroic mirror with a spatial deflection angle placed behind the green light dichroic mirror along the arrangement direction of the array light sources, and coincides with the optical axis of the first two lights after reflection to form a three-color coaxial mixed light.

[0020] Furthermore, an assembly rib is provided at the assembly end of each dichroic mirror for positioning the dichroic mirror.

[0021] Furthermore, it also includes a bracket for assembling at least two of the dichroic mirrors and connected to the coaxial synthesis module structure.

[0022] Furthermore, the coaxial synthetic light source module of the off-axis array packaged light source includes an illumination system, a light homogenization system, a focusing system, a micro-display panel and a projection system, wherein the illumination mixed white light synthesized by the coaxial synthetic light source module of the off-axis array packaged light source passes through the light homogenization system, and then forms a uniform illumination spot on the micro-display panel by the focusing system, and after being read out by the micro-display panel, the image on the micro-display panel is projected onto the screen by the projection system.

[0023] Furthermore, the coaxial synthetic light source module of the off-axis array packaged light source is any one of an LED light source module, a laser light source module, or a hybrid LED / laser light source module.

[0024] The present invention also provides an optomechanical system, comprising a coaxial synthetic light source module of an off-axis array packaged light source as described in any one of the above, wherein the optomechanical system is a 2-channel architecture and is applied to a micro projector and an embedded projection system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of the coaxial synthetic light source module of the off-axis array package in the first embodiment of the present invention;

[0026] Figure 2 FIG. 4 is a schematic diagram of the structure of an optical-mechanical system in a second embodiment of the present invention.

[0027] Description of main component symbols:

[0028] substrate 10 Dichroic Mirrors 40 Concentrating system 70 light source 20 Lighting system 50 Micro display panel 80 Collimating optical lens 30 Light homogenization system 60

[0029] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0030] In order to facilitate understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are provided in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0031] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0033] See also Figure 1 , a coaxial synthetic light source module of an off-axis array packaged light source provided by an embodiment of the present invention at least comprises:

[0034] At least two color light sources 20 are packaged off-axis on the same substrate 10, and each color of the light source 20 has a corresponding optical axis;

[0035] a collimating optical lens 30; and

[0036] at least two dichroic mirrors 40 with spatial deflection angles;

[0037] Each of the dichroic mirrors 40 corresponds to one of the light sources 20, and each of the dichroic mirrors 40 reflects light of one color;

[0038] The dichroic mirror 40 has an inclination angle of 45 degrees along the direction of the optical axis of the illumination system and a preset inclination angle along the arrangement direction of the array light source;

[0039] The optical axes of all the light sources 20 are refracted by the collimating optical lens 30 and then obliquely incident on the corresponding dichroic mirrors 40 , and then reflected by the corresponding dichroic mirrors 40 and synthesized onto the same optical axis.

[0040] The coaxial synthetic light source module of the above-mentioned off-axis array packaged light source can synthesize the optical paths of the two color light sources of the off-axis array package into a coaxial optical path by refracting the optical axes of all the light sources 20 through the collimating optical lens 30 and then obliquely incident on the corresponding dichroic mirrors 40, and synthesizing them onto the same optical axis after reflection by the corresponding dichroic mirrors 40, so that the optical paths of the two color light sources of the off-axis array package can be synthesized into a coaxial optical path, so that the optical-mechanical system formed by this coaxial synthetic light source module is efficient and compact.

[0041] In one embodiment of the present invention, the range of the preset inclination angle is.

[0042] In one embodiment of the present invention, the light emitting chips of at least two of the light sources 20 are rectangular in shape, and at least two of the light sources 20 are arranged on the off-axis package with the long sides of the light emitting chips adjacent to each other. The at least two light sources 20 include a red light source and a blue light source.

[0043] In one embodiment of the present invention, at least two of the light sources 20 further include green light sources:

[0044] The red light source and the blue light source are packaged on the same copper substrate, wherein the light emitted by the red light source and the blue light source along their respective optical axes is refracted by the same collimating lens 30, obliquely incident on the corresponding dichroic mirror 40, and then reflected by the corresponding dichroic mirror 40 to synthesize mixed light on the same optical axis; wherein the dichroic mirror 40 is used to transmit light of one color and reflect light of another color;

[0045] The green light source is packaged on a copper substrate, and the emitted light passes through the corresponding dichroic mirror 4 and overlaps with at least two coaxial color lights, red light and blue light, reflected from the other two dichroic mirrors 40 to form a coaxial mixed illumination light.

[0046] In one embodiment of the present invention, at least two of the light sources 20 include a green light color, wherein the green light color light emitting chip is packaged on the central optical axis of the copper substrate, and the light emitting chips of the red light source and the blue light source are packaged off-axis above and below the green light emitting chip; the red light, green light, and blue light sources emit light along their respective optical axes, and after being refracted by the same collimating optical lens 30, they are incident on the three dichroic mirrors 40, wherein the green light is incident on the green light dichroic mirror placed in the middle at 45 degrees to the optical axis of the lighting system and then reflected at 90 degrees, the red light or the blue light is obliquely incident on the dichroic mirror with a spatial deflection angle placed in front of the green light dichroic mirror along the arrangement direction of the array light sources, and coincides with the green light optical axis after reflection, and the light of the third color is obliquely incident on the dichroic mirror with a spatial deflection angle placed behind the green light dichroic mirror along the arrangement direction of the array light sources, and coincides with the optical axis of the first two lights after reflection to form a three-color coaxial mixed light.

[0047] In one embodiment of the present invention, an assembly rib (not shown) is disposed at the assembly end of each dichroic mirror 40 for positioning the dichroic mirror 40 .

[0048] In one embodiment of the present invention, a bracket (not shown) is further included for assembling at least two of the dichroic mirrors 40 and connecting to the coaxial synthesis module structure. Specifically, the bracket can be connected to the coaxial synthesis module structure by glue dispensing.

[0049] In one embodiment of the present invention, the coaxial synthetic light source module of the off-axis array packaged light source includes an illumination system 50, a light homogenization system 60, a focusing system 70, a micro-display panel 80 and a projection system, wherein the illumination mixed white light synthesized by the coaxial synthetic light source module of the off-axis array packaged light source passes through the light homogenization system 60, and then forms a uniform illumination spot on the micro-display panel 80 by the focusing system 70, and after being read by the micro-display panel 80, the image on the micro-display panel 80 is projected onto the screen by the projection system.

[0050] In one embodiment of the present invention, the coaxial synthetic light source module of the off-axis array packaged light source is any one of an LED light source module, a laser light source module, or a hybrid LED / laser light source module.

[0051] The present invention also provides an optomechanical system, comprising a coaxial synthetic light source module of an off-axis array packaged light source as described in any one of the above, wherein the optomechanical system is a 2-channel architecture and is applied to a micro projector and an embedded projection system.

[0052] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A coaxial synthetic light source module of an off-axis array packaged light source, characterized in that: At least: At least two light sources of two colors are packaged off-axis on the same substrate, and each light source of the two colors has a corresponding optical axis; a collimating optical lens; and at least two dichroic mirrors with spatial deflection angles; Wherein, each of the dichroic mirrors corresponds to one of the light sources, and each of the dichroic mirrors reflects light of one color; Wherein, the dichroic mirror has an inclination angle of 45 degrees along the direction of the optical axis of the illumination system and a preset inclination angle along the arrangement direction of the array light source; The optical axes of all the light sources are refracted by the collimating optical lens and then obliquely incident on the corresponding dichroic mirrors, and then reflected by the corresponding dichroic mirrors and synthesized onto the same optical axis.

2. The coaxial synthetic light source module of the off-axis array packaged light source according to claim 1, characterized in that: The range of the preset inclination angle is.

3. The coaxial synthetic light source module of the off-axis array packaged light source according to claim 1, characterized in that: The light emitting chips of at least two of the light sources are rectangular in shape, and the at least two light sources are arranged on the off-axis package with the long sides of the light emitting chips adjacent to each other. The at least two light sources include a red light source and a blue light source.

4. The coaxial synthetic light source module of the off-axis array packaged light source according to claim 3, characterized in that: At least two of the light sources also include a green light source: The red light source and the blue light source are packaged on the same copper substrate, wherein the light emitted by the red light source and the blue light source along their respective optical axes is refracted by the same collimating lens, obliquely incident on the corresponding dichroic mirror, and then reflected by the corresponding dichroic mirror to synthesize mixed light on the same optical axis; wherein the dichroic mirror is used to transmit light of one color and reflect light of another color; The green light source is packaged on a copper substrate, and the emitted light passes through the corresponding dichroic mirror and overlaps with at least two coaxial color lights, red light and blue light, reflected from the other two dichroic mirrors to form coaxial mixed illumination light.

5. The coaxial synthetic light source module of the off-axis array packaged light source according to claim 3, characterized in that: At least two of the light sources include a green light color, wherein the green light color light emitting chip is packaged on the central optical axis of the copper substrate, and the light emitting chips of the red light source and the blue light source are packaged off-axis above and below the green light emitting chip; the red light, green light and blue light sources respectively emit light along their respective optical axes, and after being refracted by the same collimating optical lens, they are incident on the three dichroic mirrors, wherein the green light is incident on the green light dichroic mirror placed in the middle at 45 degrees to the optical axis of the lighting system and then reflected at 90 degrees, the red light or the blue light is obliquely incident on the dichroic mirror with a spatial deflection angle placed in front of the green light dichroic mirror along the arrangement direction of the array light sources, and coincides with the green light optical axis after reflection, and the light of the third color is obliquely incident on the dichroic mirror with a spatial deflection angle placed behind the green light dichroic mirror along the arrangement direction of the array light sources, and coincides with the optical axis of the first two lights after reflection to form a three-color coaxial mixed light.

6. The coaxial synthetic light source module of the off-axis array packaged light source according to claim 1, characterized in that: The assembly end of each dichroic mirror is provided with an assembly rib for positioning the dichroic mirror.

7. The coaxial synthetic light source module of the off-axis array packaged light source according to claim 1, characterized in that: It also includes a bracket for assembling at least two dichroic mirrors and connected to the coaxial synthesis module structure.

8. The coaxial synthetic light source module of the off-axis array packaged light source according to any one of claims 1 to 6, characterized in that: The coaxial synthetic light source module of the off-axis array packaged light source includes an illumination system, a light homogenization system, a light focusing system, a micro-display panel and a projection system, wherein the illumination mixed white light synthesized by the coaxial synthetic light source module of the off-axis array packaged light source passes through the light homogenization system, and then forms a uniform illumination spot on the micro-display panel by the light focusing system. After being read by the micro-display panel, the image on the micro-display panel is projected onto the screen by the projection system.

9. The coaxial synthetic light source module of the off-axis array packaged light source according to claim 1, characterized in that: The coaxial synthetic light source module of the off-axis array packaged light source is any one of an LED light source module, a laser light source module, or a hybrid LED / laser light source module.

10. An optical-mechanical system, characterized in that: A coaxial synthetic light source module comprising the off-axis array packaged light source as described in any one of claims 1 to 9, wherein the optical-mechanical system is a 2-channel architecture and is applied to micro-projectors and embedded projection systems.

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