CN217846874U - Optical machine illumination system and laser projection equipment - Google Patents

Abstract

The application discloses ray apparatus lighting system and laser projection equipment belongs to the laser projection field. The opto-mechanical lighting system may include: a DMD light valve and a prism assembly. The prism assembly comprises: a first prism, a second prism, and a third prism. And an included angle between the second side surface and the third side surface of the second prism is an obtuse angle. Therefore, when a micro-mirror in the DMD light valve is in a second state, the incident angle of the second laser reflected by the micro-mirror to the second side surface of the second prism is larger, so that the second laser emitted to the second side surface of the second prism can meet the total reflection condition, the probability that part of light in the second laser is refracted out from the second side surface of the second prism is lower, and the probability that part of light in the second laser enters the imaging system is lower. Therefore, the contrast of a projection display picture projected by the laser projection equipment integrated with the optical machine illumination system can be effectively improved.

Description

Optical machine illumination system and laser projection equipment

Technical Field

The application relates to the field of laser projection, in particular to an optical machine illumination system and laser projection equipment.

Background

With the continuous development of science and technology, laser projection equipment is more and more applied to people's work and life. At present, a laser projection apparatus mainly includes a light source system, an optical machine illumination system, and a lens.

The optical-mechanical illumination system is used for receiving the laser beam provided by the light source system, modulating the received laser beam to obtain a modulated beam, emitting the modulated beam to the lens, and the lens is used for receiving the modulated beam of the optical-mechanical illumination system and projecting the modulated beam to obtain a projection picture. Therefore, the laser beam modulated by the optical-mechanical illumination system largely determines the sharpness of the projected picture.

However, after the laser beam is modulated by the existing optical-mechanical illumination system, the obtained modulated beam is easily inconsistent in brightness, so that the contrast of a projection picture projected by the imaging system is low, and the display effect of the projection picture is poor.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides an optical machine illumination system and laser projection equipment. The problem that the contrast of a projection picture projected by laser projection equipment in the prior art is low can be solved, and the technical scheme is as follows:

in one aspect, a light engine lighting system is provided, comprising: a Digital Micromirror Device (DMD) light valve and prism assembly;

the prism assembly includes: the light source system comprises a first prism, a second prism and a third prism, wherein a first side surface of the first prism is glued with a first side surface of the second prism, a second side surface of the second prism is glued with a first side surface of the third prism, an included angle between the second side surface and the third side surface of the second prism is an obtuse angle, the first prism is positioned on a light-emitting side of the light source system, and an imaging system is arranged on the light-emitting side of the third prism;

the DMD light valve is provided with a plurality of micro mirrors arranged in an array mode, and the reflecting surfaces of the micro mirrors face the third side face of the second prism;

the first prism is used for carrying out total reflection on the laser beams provided by the light source system so that the laser beams penetrate through the second prism and then are emitted to the micro mirrors in the DMD light valve;

when the micro reflector is in a first state, the first laser is emitted to the imaging system after being totally reflected on the first side surface of the second prism; when the micro reflector is in a second state, second laser is totally reflected on the second side face of the second prism and then emitted out of the imaging system;

the first laser is the laser reflected by the micro-mirror in the first state in the laser beam, and the second laser is the laser reflected by the micro-mirror in the second state in the laser beam.

In another aspect, there is provided a laser projection apparatus including: the system comprises a light source system, an optical machine illumination system and an imaging system, wherein the optical machine illumination system is the optical machine illumination system;

the light source system is used for providing laser beams for the optical machine illumination system;

the optical machine illumination system is used for modulating the laser beam provided by the light source system into an image beam and then emitting the image beam to the imaging system;

the imaging system is used for imaging the image light beam and then emitting the image light beam to a projection screen.

The beneficial effects that technical scheme that this application embodiment brought include at least:

an opto-mechanical lighting system may include: a DMD light valve and a prism assembly. The prism assembly includes: a first prism, a second prism, and a third prism. And an included angle between the second side surface and the third side surface of the second prism is an obtuse angle. Therefore, when a micro-reflector in the DMD light valve is in a second state, the incident angle of the second laser reflected by the micro-reflector to the second side surface of the second prism is large, so that the second laser emitted to the second side surface of the second prism can meet the total reflection condition, the probability that part of light in the second laser is refracted out of the second side surface of the second prism is low, the second laser can be emitted to the light-absorbing component after being totally reflected by the second side surface of the second prism, and the probability that part of light in the second laser enters the imaging system is low. Therefore, the contrast of a projection display picture projected by the laser projection equipment integrated with the optical machine illumination system can be effectively improved, and the display effect of the projection picture is better.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic diagram of an optical-mechanical lighting system in the related art;

fig. 2 is a schematic structural diagram of an optical-mechanical illumination system according to an embodiment of the present disclosure;

fig. 3 is a schematic optical path diagram of an optical-mechanical illumination system according to an embodiment of the present disclosure;

fig. 4 is a schematic optical path diagram of another optical-mechanical illumination system provided in the embodiment of the present application;

fig. 5 is a schematic optical path diagram of another optical-mechanical illumination system provided in the embodiment of the present application;

fig. 6 is a schematic structural diagram of another optical-mechanical illumination system provided in the embodiment of the present application;

FIG. 7 is a schematic diagram of optical paths of parallel plates in a prism assembly according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of another optical-mechanical lighting system provided in the embodiment of the present application;

fig. 9 is a schematic structural diagram of a laser projection apparatus according to an embodiment of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 is a schematic diagram illustrating an operation of an optical bench lighting system in the related art. The optical-mechanical illumination system 00 includes an illumination lens assembly 10, a prism assembly 20 and a Digital micro-mirror device (DMD) light valve 30.

Here, the DMD light valve 30 has a plurality of micromirrors arranged in an array, and a micro driving mechanism connected to each micromirror. Each driving mechanism is used for driving the corresponding micro-reflector to rotate, and the light emitted to the micro-reflector can be guided to the first position or the light emitted to the micro-reflector is guided to the second position through the rotation of the micro-reflector. The light rays guided to the first position can be normally emitted from the first position, and the light rays guided to the second position can be absorbed so that the light rays cannot be emitted from the second position. For this reason, the DMD light valve 30 may be regarded as a kind of light switch composed of a plurality of micromirrors, the number of which determines the resolution of the DMD light valve 30, one micromirror corresponds to one pixel, and the micromirror is the smallest unit of operation of the DMD light valve 30. After integrating the DMD light valve into the opto-mechanical illumination system 00, the imaging system 40 is placed in the first position and the light absorbing member (not shown) is placed in the second position.

The prism assembly 20 may include a first prism 21 and a second prism 22. After the laser beam provided by the light source system is emitted to the illumination system 00, the illumination mirror group 10 in the illumination system 00 may guide the laser beam to the first prism 21 in the prism assembly 20, and guide the laser beam to the second prism 22 after being totally reflected in the first prism 1, and the laser beam may be incident to the DMD light valve 30 through the second prism 22. The DMD light valve 30 can control a plurality of driving mechanisms according to image information to be displayed, so that each micro-mirror in the DMD light valve 30 can rotate by a corresponding angle, and further a modulated light beam can be obtained, and the modulated light beam can be guided to the imaging system 40 by the second prism 22.

In the modulation process of the laser beam of the DMD light valve 30, if a micromirror in the DMD light valve 30 is in the first state, the first laser L1 reflected by the micromirror may be guided to the imaging system by the second prism 22, so that the subsequently presented projection image presents a bright state at the corresponding position; if a micromirror in the DMD light valve 30 is in the second state, the second laser light L2 reflected by the micromirror may be guided by the second prism 22 to the light-absorbing component outside the imaging system 40, and the second laser light L2 may be absorbed by the light-absorbing component, so that the subsequently presented projection image is in a dark state at the corresponding position.

However, when the micro mirrors in the present DMD light valve 30 are in the second state, the incident angle of the second laser light L2 reflected by the micro mirrors when the second laser light L2 is emitted to the side surface of the second prism 22 adjacent to the imaging system 40 is small, which results in that the second laser light L2 is not totally reflected at the side surface, that is, only a part of the light L2a in the second laser light L2 will be reflected to the light-absorbing component by the side surface, another part of the light L2b will be refracted out from the side surface, and the refracted light L2b may enter the imaging system 40, thereby resulting in that the contrast of the projection image subsequently projected by the imaging system 40 is low.

Referring to fig. 2, fig. 2 is a schematic structural diagram of an optical-mechanical illumination system according to an embodiment of the present disclosure. The opto-mechanical lighting system 000 may include: DMD light valve 100 and prism assembly 200.

The DMD light valve 100 in the optical engine illumination system 000 has a plurality of micromirrors (not shown in the figure) arranged in an array. In the present application, DMD light valve 100 also has: and a micro driving mechanism (not shown) connected to each micro mirror, each driving mechanism being used for driving the corresponding micro mirror to rotate. The driving structure drives the micro-mirror to rotate, so that the micro-mirror can be in the first state or the second state.

The prism assembly 200 in the optical bench illumination system 000 can include: a first prism 201, a second prism 202 and a third prism 203. Here, the first prism 201 has a first side S11, a second side S12, and a third side S13, the second prism 202 has a first side S21, a second side S22, and a third side S23, and the third prism 203 has a first side S31, a second side S32, and a third side S33. The first side S11 of the first prism 201 is glued to the first side S21 of the second prism 202, and the second side S22 of the second prism 202 is glued to the first side S31 of the third prism 203. The included angle β between the second side S22 and the third side S23 of the second prism 302 is an obtuse angle.

When the first side surface S11 of the first prism 201 and the first side surface S21 of the second prism 202 are bonded, a certain gap is formed between the first side surface S11 of the first prism 201 and the first side surface S21 of the second prism 202, and the gap may be filled with air having a low refractive index. In this way, if the incident angle of the light beam incident on the first side surface S11 of the first prism 201 is large, the light beam traveling in the first prism 201 may satisfy the total reflection condition, that is, may be totally reflected by the first side surface S11 of the first prism 201. Similarly, among the light rays transmitted in the second prism 202, if the incident angle of the light ray emitted to the first side S21 of the second prism 202 is large, the light ray may satisfy the total reflection condition, i.e., may be totally reflected by the first side S21 of the second prism 202. Similarly, when the second side surface S22 of the second prism 202 and the first side surface S31 of the third prism 203 are bonded, a gap is also present between the second side surface S22 of the second prism 202 and the first side surface S31 of the third prism 203, and the gap may be filled with air having a low refractive index. In this way, if the incident angle of the light beam emitted to the second side surface S22 of the second prism 202 is large, the light beam transmitted in the second prism 202 can satisfy the total reflection condition, that is, the light beam can be totally reflected by the second side surface S22 of the second prism 202. For example, the gap between the second side surface S22 of the second prism 202 and the first side surface S31 of the third prism 203, and the gap between the second side surface S22 of the second prism 202 and the first side surface S31 of the third prism 203 may be 0.005 mm. Based on these principles of total reflection, the following embodiments will illustrate the principles of the illumination system of the light machine:

referring to fig. 3, fig. 3 is a schematic light path diagram of an optical-mechanical illumination system according to an embodiment of the present disclosure. The reflective surfaces of the plurality of micro-mirrors within DMD light valve 100 may each face a third side S23 toward a second prism 202 in prism assembly 200. The first prism 201 in the prism assembly 200 is located on the light exit side of the light source system 001, and the light exit side of the third prism 203 in the prism assembly 200 is provided with the imaging system 002. Here, the light exit side of the third prism 203 is: the side on which the second side S32 of the third prism 203 is located.

The first prism 201 is configured to perform total reflection on the laser beam provided by the light source system 001, so that the laser beam passes through the second prism 202 and then is emitted to the plurality of micro mirrors in the DMD light valve 100.

For example, when the laser beam provided by the light source system 001 is emitted to the first prism 201 of the prism assembly 200, the laser beam may enter the first prism 201 from the second side S12 of the first prism 201 and be totally reflected for the first time at the first side S11 of the first prism 201, the laser beam after being totally reflected for the first time may be emitted to the third side S13 of the first prism 201 and be totally reflected for the second time at the third side S13 of the first prism 201, and the laser beam after being totally reflected for the second time may be emitted to the plurality of micromirrors in the DMD light valve 100 after sequentially passing through the first side S11 of the first prism 201, the first side S21 of the second prism 202, and the third side S23.

In this application, the DMD light valve 100 may control a plurality of driving mechanisms according to image information to be displayed, so that each micromirror in the DMD light valve 100 may rotate by a corresponding angle, and each micromirror is in a first state or a second state, so as to modulate a laser beam.

When the micro mirror is in the first state, the first laser L10 in the laser beam is totally reflected on the first side S21 of the second prism 202 and then emitted to the imaging system 002; when the micro-mirror is in the second state, the second laser light L20 in the laser beam is totally reflected at the second side S22 of the second prism 202 and then emitted out of the imaging system 002. Here, the first laser light L10 is laser light of the laser beam reflected by the micromirror in the first state, and the second laser light L20 is laser light of the laser beam reflected by the micromirror in the second state.

Illustratively, the micro-mirrors within DMD light valve 100 are used to: when the micro-mirror is in the first state, the first laser L10 emitted to the micro-mirror in the laser beam is reflected to the first side surface S21 of the second prism 202, so that the first side surface S21 of the second prism 202 totally reflects the first laser L10, passes through the third prism 203, and then emits to the imaging system 002; when the micro mirror is in the second state, the second laser L20 emitted to the micro mirror in the laser beam is reflected to the second side S22 of the second prism 202, so that the second side S22 of the second prism 202 totally reflects the second laser L20, and the second side S22 of the second prism 202 totally reflects the second laser L20 and emits the second laser L20 to the outside of the imaging system 002.

For example, the optical bench lighting system 000 may further include: a light-absorbing member (not shown) located outside the imaging system 002. After the second laser light L20 is fully emitted by the second side S22 of the second prism 202, the second laser light L20 may be emitted to a light absorbing member located outside the imaging system 002, so that the second laser light L20 may be absorbed by the light absorbing member to prevent a part of the light in the second laser light L20 from being emitted from the imaging system 002.

In this application, if a certain micro-mirror in the DMD light valve 100 is in the first state, the first laser light L10 emitted to the micro-mirror is reflected on the reflection surface of the micro-mirror, the reflected first laser light L10 may enter the second prism 202 from the third side surface S23 of the second prism 202, and the first laser light L10 entering the second prism 202 may be totally reflected by the first side surface S21 of the second prism 202, and the totally reflected first laser light L10 may sequentially pass through the second side surface S22 of the second prism 202, the first side surface S31 and the second side surface S32 of the third prism 203 and then be emitted to the imaging system 002, so that a subsequently presented projection picture is in a bright state at a corresponding position.

If the micro-mirror in the DMD light valve 100 is in the second state, the second laser light L20 reflected by the micro-mirror is reflected by the reflecting surface of the mirror, the reflected second laser light L20 may enter the second prism 202 from the third side surface S23 of the second prism 202, and the second laser light L20 entering the second prism 202 may be totally reflected by the second side surface S22 of the second prism 202, the totally reflected second laser light L20 may pass through the first side surface S21 of the second prism 202 and then emit to the light-absorbing component outside the imaging system 002, and the second laser light L20 may be absorbed by the light-absorbing component, so that the subsequently presented projection image is in a dark state at the corresponding position.

In the embodiment of the present application, the included angle β between the second side S22 and the third side S23 of the second prism 302 is an obtuse angle. Therefore, when the micro-mirror is in the second state, the incident angle of the second laser light L20 reflected by the micro-mirror to the second side surface S22 of the second prism 302 is relatively large, so that the second laser light L20 emitted to the second side surface S22 of the second prism 302 can satisfy the total reflection condition, so that the probability that part of the light in the second laser light L20 is refracted out from the second side surface S22 of the second prism 302 is relatively low, it is ensured that the second laser light L20 can be emitted to the light-absorbing component after being totally reflected by the second side surface S22 of the second prism 302, and further, the probability that part of the light in the second laser light L20 enters the imaging system 002 is relatively low.

In summary, the optical machine illumination system provided by the embodiment of the present application may include: a DMD light valve and a prism assembly. The prism assembly comprises: a first prism, a second prism, and a third prism. And an included angle between the second side surface and the third side surface of the second prism is an obtuse angle. Therefore, when a micro-reflector in the DMD light valve is in a second state, the incident angle of the second laser reflected by the micro-reflector to the second side surface of the second prism is large, so that the second laser emitted to the second side surface of the second prism can meet the total reflection condition, the probability that part of light in the second laser is refracted out of the second side surface of the second prism is low, the second laser can be emitted to the light-absorbing component after being totally reflected by the second side surface of the second prism, and the probability that part of light in the second laser enters the imaging system is low. Therefore, the contrast of a projection display picture projected by the laser projection equipment integrated with the optical machine illumination system can be effectively improved, and the display effect of the projection picture is better.

In the embodiment of the present application, referring to fig. 3, the second side surface S32 of the third prism 203 in the prism assembly 200 is perpendicular to the third side surface S32, and the third side surface S33 of the third prism 203 is parallel to the third side surface S23 of the second prism 202. That is, the third side surface S23 of the second prism 202 is perpendicular to the second side surface S32 of the third prism 203. Here, the second side S32 of the third prism 203 may face the imaging system 002.

In this case, when a micro mirror in the DMD light valve 30 is in the first state, the reflective surface of the micro mirror may reflect the first laser light L10 that directs the laser beam to the micro mirror, and after the first laser light L10 is reflected by the reflective surface of the micro mirror, the first laser light L10 may be directed to the second prism 202 perpendicular to the third side surface S23 of the second prism 202, and the first laser light L10 that is directed to the second prism 202 may be directed to the first side surface S21 of the second prism 202. The first side surface S21 of the second prism 202 may totally reflect the first laser light L10, and the totally reflected first laser light L10 may be parallel to the third side surface S23 of the second prism 202. In this way, since the third side surface S23 of the second prism 202 is perpendicular to the second side surface S32 of the third prism 203, the first laser light L10 totally reflected by the first side surface S21 of the second prism 202 may sequentially pass through the second side surface S22 of the second prism 202 and the first side surface S31 of the third prism 203 and then vertically irradiate the second side surface S32 of the third prism 203, so that the first laser light L10 emitted from the second side surface S32 of the third prism 203 does not undergo a refraction phenomenon, and it is ensured that all of the emitted first laser light L10 can enter the imaging system 002. Thus, the contrast of the projection display image projected by the laser projection device integrated with the optical machine illumination system 000 can be further improved.

Optionally, the third side S32 of the triangular prism 203 in the prism assembly 200 is coplanar with the third side S23 of the second prism 202. Therefore, the prism assembly 200 can be guaranteed to be capable of reflecting all laser reflected by any micro-reflector in the first state to the imaging system 002, the whole volume of the prism assembly 200 is guaranteed to be small, and the volume of the laser projection equipment integrated with the optical machine illumination system 000 is effectively reduced.

In the embodiment of the present application, please refer to fig. 4, and fig. 4 is a schematic light path diagram of another optical-mechanical illumination system provided in the embodiment of the present application. When the micromirrors in DMD light valve 100 are in the second state,the principal ray L20a of the second laser light L20 reflected by this micromirror has an incident angle θ at the second side S22 of the second prism 202 ₁ The following conditions are satisfied:

wherein alpha is ₁ Is the incident angle, alpha, of the chief ray of the second laser light L20 on the micro-mirror in the DMD light valve ₂ Being deflection angles of micro-mirrors, alpha ₃ Is the angle between the first side surface S31 and the second side surface S32 of the third prism 203, n ₁ Is the refractive index of the second prism 202. Here, the principal ray L20a of the second laser light L20 reflected by the micromirror refers to: a ray of the second laser light L20 that coincides with the central optical axis of the second laser light L20.

Referring to fig. 4, when the micro-mirror in the dmd light valve 100 is in the second state, the edge light L20b of the second laser light L20 reflected by the micro-mirror is at the incident angle θ to the second side S22 of the second prism 202 ₂ The following conditions are satisfied:

wherein, F/# is the F number of the optical machine illumination system 000. Here, the edge light L20b of the second laser light L20 reflected by the micromirror refers to: a ray at an edge position of the second laser light L20 in the second laser light L20.

Note that arcsin1/n ₁ Is the critical angle of total reflection of the second laser light L20, i.e. the incident angle theta of the principal ray L20a of the second laser light L20 on the second side S22 of the second prism 202 ₁ And the incident angle theta 2 of the marginal ray L20b on the second side S22 of the second prism 202 can satisfy the condition that the incident angle is larger than the total reflection critical angle arcsin1/n ₁ In this case, the second laser light L20 may be totally reflected on the second side surface S22 of the second prism 202, so as to ensure that the second laser light L20 is not refracted out of the second side surface S22 of the second prism 202.

In the context of the present application, it is,when the chip type number of DMD light valve 100 is determined, the deflection angle α of the micro-reflection within DMD light valve 100 ₂ Is a fixed value, and the incident angle α of the principal ray L20a of the second laser light L20 on the micro-mirrors in the DMD light valve 100 ₁ Also a fixed value. Illustratively, when the model of the DMD light valve 100 is 0.47 inch DMD, the incident angle α of the chief ray L20a of the second laser light L20 on the micromirror in the DMD light valve 100 ₁ At 34 degrees, the deflection angle of the micro-mirrors in DMD light valve 100 is 17 degrees. Meanwhile, when the material of the second prism 202 is determined, the refractive index n ₁ Also constant. For example, when the second prism 202 is made of glass, the refractive index n ₁ Is 1.5.

In order to make the second laser light L20 totally reflect on the second side surface S22 of the second prism 202 to avoid the second laser light L20 entering the imaging system, the included angle α between the first side surface S31 of the third prism 203 and the second side surface S32 of the third prism 203 can be artificially controlled ₃ So that the incident angle θ of the principal ray L20a of the second laser light L20 on the second side surface S22 of the second prism 202 ₁ And the angle of incidence θ of the marginal ray L20b on the second side S22 of the second prism 202 ₂ All can meet the condition that the angle is larger than the critical angle arcsin1/n of total reflection ₁ The conditions of (1).

For example, as can be seen from the above calculation formula, when the angle α 3 between the first side surface S31 of the third prism 203 and the second side surface S32 of the third prism 203 is larger, the incident angle θ of the principal ray L20a of the second laser light L20 on the second side surface S22 of the second prism 202 is larger ₁ And the incident angle theta of the marginal ray L20b at the second side S22 of the second prism 202 ₂ The larger. That is, α ₃ The larger, theta ₁ And theta ₂ The easier it is to satisfy the condition that the critical angle arcsin1/n is larger than the total reflection ₁ The conditions of (1). However, when the included angle α 3 between the first side surface S31 of the third prism 203 and the second side surface S32 of the third prism 203 is too large, and the micro-mirror in the DMD light valve 100 is in the second state, part of the light beam of the second laser light L20 reflected by this micro-mirror may not be refracted from the third side surface S23 of the second prism 202 into the second prism 202, but directly enter the third prism 203 from the third side surface S33 of the third prism 203 and be directed to the third prism 203Second side S32 of 203 and finally refracts from second side S32 of third prism 203 into imaging system 002.

Therefore, please refer to fig. 5, wherein fig. 5 is a schematic light path diagram of another optical bench illumination system provided in the embodiment of the present application. The vertical distance L between the side of the third side surface S23 of the second prism 202 adjacent to the third prism 203 and the intersection point of the principal ray of the first laser light L10 emitted to the third side surface S23 of the second prism L102 satisfies the following condition:

where h is the distance between DMD light valve 100 and second prism 202.

In this way, it is ensured that the incident point of the second laser light L20 on the second prism 202 is all within the third side surface S23 of the second prism 202, that is, the second laser light L20 is emitted from the DMD light valve 100 and enters the second prism 202, and does not directly enter the third prism 203.

In the embodiment of the present application, in order to obtain a projection picture with higher resolution, a galvanometer 300 is disposed between the prism assembly 200 and the DMD light valve 100. The DMD light valve 100 may obtain an image light beam after adjusting the laser light beam, the vibrating mirror 300 disposed between the prism assembly 200 and the DMD light valve 100 may perform offset processing on the image light beam adjusted by the DMD light valve 100, and the light beam after offset processing may be reflected to the imaging system 002 by the prism assembly 200 again. Here, the image beam may project a first projection screen through the imaging system 002 before being shifted by the galvanometer 300, and the image beam may project a second projection screen through the imaging system 002 after being shifted by the galvanometer 300. Therefore, the first projection picture and the second projection picture can be sequentially presented on the projection screen, the first projection picture and the second projection picture can be equivalent to a frame of target picture by means of visual reaction of human eyes, and the laser projection equipment integrated with the optical machine illumination system 000 can project a projection picture with higher resolution.

Since the volume of the galvanometer 300 in the optical illumination system 000 is generally large, the horizontal distance between the galvanometer 300 and the first prism 201 in the prism assembly 200 is small, and when the illumination optical system 000 is assembled, the galvanometer 300 and the first prism 201 are likely to collide with each other, which may cause the galvanometer 300 and the first prism 201 to be damaged.

To this end, in the embodiment of the present application, please refer to fig. 6, fig. 6 is a schematic structural diagram of another optical-mechanical illumination system provided in the present application, and the prism assembly 200 in the optical-mechanical illumination system 000 may further include: and a parallel plate 204 positioned between the first prism 201 and the second prism 202, one surface S41 of the parallel plate 204 being glued to the first side surface S11 of the first prism 201, and the other surface S42 of the parallel plate 204 being glued to the first side surface S21 of the second prism 102. Here, when the one surface S41 of the parallel plate 204 is bonded to the first side surface S11 of the first prism 201, a gap is formed between the one surface S41 of the parallel plate 204 and the first side surface S11 of the first prism 201, and the gap may be filled with air having a low refractive index. Similarly, when the other surface S42 of the parallel plate 204 is bonded to the first side surface S21 of the second prism 102, a certain gap is also present between the other surface S42 of the parallel plate 204 and the first side surface S21 of the second prism 102, and the gap may be filled with air having a low refractive index. Illustratively, the size of the gap between the one surface S41 of the parallel plate 204 and the first side surface S11 of the first prism 201 and the size of the gap between the other surface S42 of the parallel plate 204 and the first side surface S21 of the second prism 102 are both 0.005 mm. It should be noted that the reason why a certain gap is provided between the parallel flat plate 204 and the first prism 201 and a certain gap is provided between the parallel flat plate 204 and the second prism 202 is that: in order to enable the laser beam to be totally reflected in the prism assembly 200, reference is made to the foregoing description for relevant principles, which are not described herein again.

In the present application, the horizontal distance between the first prism 201 and the galvanometer 300 may be increased by providing a parallel plate 204 between the first prism 201 and the second prism 202.

For example, referring to fig. 6 and 7, fig. 7 is a schematic diagram of optical paths of parallel plates in a prism assembly provided in an embodiment of the present application, wherein one surface S41 of the parallel plate 204 is parallel to the other surface S42 of the parallel plate 204, after a laser beam L30 entering the prism assembly 200 passes through the first prism 201, the laser beam L30 may enter the parallel plate 204 from the one surface S41 of the parallel plate 204, and after the laser beam L30 enters the parallel plate 203, the laser beam L30 may pass through the other surface S42 of the parallel plate 204 and enter the second prism 202. The laser beam L30 is refracted when entering the parallel plate 204 from the one surface S41 of the parallel plate 204, and is refracted again when exiting from the other surface S42 of the parallel plate 204. Here, the incident point of the laser beam L30 on the other surface S42 of the parallel plate 204 when passing through the other surface S42 of the parallel plate 204 is P1. Assuming that the laser beam L30 is not refracted in the parallel plate 204, the incident point of the laser beam L30 at the position of the other surface S42 of the parallel plate 204 is P2. The distance D2 between the point P1 and the point P2 is the offset distance of the parallel plate 204 to the light ray. Wherein, the distance D2 between the point P1 and the point P2 is as follows:

where D1 is the thickness of the parallel plate 204 and n ₂ Is the refractive index, ε, of the parallel plate 204 ₁ Is the incident angle of the laser beam L30 on the one surface S41 of the parallel plate 204.

In this way, when the parallel plate 204 is introduced between the first prism 201 and the second prism 202, since the parallel plate 204 can shift the laser beam transmitted in the parallel plate 204 by a certain distance, the horizontal distance between the first prism 201 and the galvanometer 300 can be increased. In this way, it is possible to ensure that the probability of collision between the galvanometer 300 and the first prism 201 is low when the illumination optical system 000 is assembled. Here, the first prism 201, the second prism 202, the third prism 203 and the parallel plate 204 in the prism assembly 200 may be made of the same material, or may be made of different materials, and if the materials are made of different materials, the ratio of the thermal expansion coefficients of the selected materials cannot exceed 1.5, so as to ensure that the prism assembly 200 is not damaged due to temperature changes.

It should be noted that although the thickness of the parallel plate 204 in the prism assembly 200 is thicker, the distance of the deviation of the laser beam transmitted in the parallel plate 204 is larger, that is, the horizontal distance between the first prism 201 and the galvanometer mirror 300 is larger. However, since an excessive thickness of the parallel plate 204 affects the overall transmittance of the prism assembly 200, the thickness of the parallel plate 204 can range from: 4 mm to 8 mm. Thus, the parallel plate 204 can ensure that the first prism 201 and the galvanometer 300 have a sufficient horizontal distance therebetween, and simultaneously ensure that the light transmittance of the prism assembly 200 is good.

In the embodiment of the present application, please refer to fig. 8, and fig. 8 is a schematic structural diagram of another optical-mechanical illumination system provided in the embodiment of the present application. The opto-mechanical lighting system 000 may further comprise: and a lens group 400 positioned between the first prism 201 and the light source system 001. Here, the lens group 400 can correct the aberration of the laser beam emitted from the light source system 001. For example, a laser beam from the light source system 001 enters the lens assembly 400 of the optical-mechanical illumination system 000, and the lens assembly 400 corrects the aberration of the laser beam entering the lens assembly and then directs the corrected laser beam to the prism assembly 200.

In summary, the optical machine illumination system provided by the embodiment of the present application may include: a DMD light valve and a prism assembly. The prism assembly includes: a first prism, a second prism, and a third prism. And an included angle between the second side surface and the third side surface of the second prism is an obtuse angle. Therefore, when a micro-reflector in the DMD light valve is in a second state, the incident angle of the second laser reflected by the micro-reflector to the second side surface of the second prism is large, so that the second laser emitted to the second side surface of the second prism can meet the total reflection condition, the probability that part of light in the second laser is refracted out of the second side surface of the second prism is low, the second laser can be emitted to the light-absorbing component after being totally reflected by the second side surface of the second prism, and the probability that part of light in the second laser enters the imaging system is low. Therefore, the contrast of a projection display picture projected by the laser projection equipment integrated with the optical machine illumination system can be effectively improved, and the display effect of the projection picture is better.

Referring to fig. 9, fig. 9 is a schematic structural diagram of a laser projection apparatus according to an embodiment of the present disclosure. The laser projection apparatus may include: a light source system 001, an optical machine illumination system 000, and an imaging system 002. The light source system 001 is configured to provide a laser beam to the optical machine illumination system 000, the optical machine illumination system 000 is configured to modulate the laser beam provided by the light source system 001 into an image beam and emit the image beam to the imaging system 002, and the imaging system 002 is configured to image the image beam and emit the image beam to the projection screen. Here, the optical engine illumination system 000 may be the optical engine illumination system in the above embodiment. For example, this opto-mechanical illumination system 000 may be the opto-mechanical system 000 shown in fig. 2, 4, 5, 6, or 8.

In this application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.

The above description is intended to be exemplary only, and not to limit the present application, and any modifications, equivalents, improvements, etc. made within the spirit and scope of the present application are intended to be included therein.

Claims (10)

1. An opto-mechanical lighting system, comprising: a Digital Micromirror Device (DMD) light valve and prism assembly;

the prism assembly includes: the light source system comprises a first prism, a second prism and a third prism, wherein a first side surface of the first prism is glued with a first side surface of the second prism, a second side surface of the second prism is glued with a first side surface of the third prism, an included angle between the second side surface and the third side surface of the second prism is an obtuse angle, the first prism is positioned on a light-emitting side of the light source system, and an imaging system is arranged on the light-emitting side of the third prism;

the DMD light valve is provided with a plurality of micro mirrors arranged in an array mode, and the reflecting surfaces of the micro mirrors face the third side face of the second prism;

the first prism is used for carrying out total reflection on the laser beam provided by the light source system so that the laser beam penetrates through the second prism and then is emitted to the micro mirrors in the DMD light valve;

when the micro reflector is in a first state, the first laser is emitted to the imaging system after being totally reflected on the first side surface of the second prism; when the micro-reflector is in a second state, second laser is totally reflected on the second side surface of the second prism and then emitted out of the imaging system;

the first laser is a laser reflected by the micro-mirror in the first state in the laser beam, and the second laser is a laser reflected by the micro-mirror in the second state in the laser beam.

2. The opto-mechanical illumination system of claim 1, wherein the second side of the third prism is perpendicular to the third side of the third prism, and the third side of the third prism is parallel to the third side of the second prism, the second side of the third prism facing the imaging system.

3. The opto-mechanical illumination system of claim 2, wherein the third side of the second prism is coplanar with the third side of the third prism.

4. The opto-mechanical illumination system of claim 3, wherein a chief ray of the second laser light is at an incident angle θ to the second side of the second prism ₁ The following conditions are satisfied:

wherein alpha is ₁ Is the incident angle, alpha, of the chief ray of the second laser light on the micro-mirror in the DMD light valve ₂ Is a deflection angle of the micromirror, alpha ₃ Between the first and second sides of the third prismAngle of inclusion, n ₁ Is the refractive index of the second prism.

5. The opto-mechanical illumination system of claim 4, wherein the edge ray of the second laser light is at an angle of incidence θ to the second side of the second prism ₂ The following conditions are satisfied:

wherein, the F/# is the F number of the optical machine illumination system.

6. The opto-mechanical illumination system of claim 5, wherein a vertical distance L between a side of the third side surface of the second prism adjacent to the third prism and an intersection point of the principal ray of the first laser light directed to the third side surface of the second prism satisfies the following condition:

wherein h is a distance between the DMD light valve and the second prism.

7. The opto-mechanical illumination system of any of claims 1 to 6, wherein the prism assembly further comprises: and the parallel flat plate is positioned between the first prism and the second prism, one surface of the parallel flat plate is glued with the first side surface of the first prism, and the other surface of the parallel flat plate is glued with the first side surface of the second prism.

8. The opto-mechanical illumination system of claim 7, wherein the parallel plates have a thickness in a range of: 4 mm to 8 mm.

9. The opto-mechanical illumination system of any of claims 1 to 6, further comprising: the lens group is positioned between the first prism and the light source system, and the galvanometer is positioned between the second prism and the DMD light valve.

10. A laser projection device, comprising: a light source system, an opto-mechanical illumination system and an imaging system, the opto-mechanical illumination system being as claimed in any one of claims 1 to 9;

the light source system is used for providing laser beams for the optical machine illumination system;

the optical machine illumination system is used for modulating the laser beam provided by the light source system into an image beam and then emitting the image beam to the imaging system;

the imaging system is used for imaging the image light beam and then emitting the image light beam to a projection screen.

Images