WO2023184753A1

WO2023184753A1 - Optical projection system and electronic device

Info

Publication number: WO2023184753A1
Application number: PCT/CN2022/101700
Authority: WO
Inventors: 谢典良; 许雅伶
Original assignee: 歌尔光学科技有限公司
Priority date: 2022-03-31
Filing date: 2022-06-28
Publication date: 2023-10-05
Also published as: CN114594575A

Abstract

An optical projection system and an electronic device. The optical projection system comprises: a light source module (1); at least one scanning reflector (2), the at least one scanning reflector (2) being located on a light exit side of the light source module (1); and an afocal assembly (3). The at least one scanning reflector (2) is located on a light incident side of the afocal assembly (3); the afocal assembly (3) comprises at least two sets of lens groups, the at least two sets of lens groups both have positive focal power, and each set of lens groups comprises at least one lens; a light emitting surface and a light incident surface of the lens are arranged in an axisymmetric fashion with respect to an optical axis.

Description

An optical projection system and electronic device

Technical field

The present application relates to the technical field of optical equipment, and more specifically, the present application relates to an optical projection system and electronic equipment.

Background technique

The head-mounted augmented reality near-eye display system is a display system that allows users to experience the combination of virtual images and the environment. The virtual image is directly introduced into the user's eyes through the optical projection system, or the virtual image is introduced into the user through the optical projection system combined with a waveguide plate. Glasses.

The current optical sensitivity of optical projection systems is relatively high. If some of the lenses in the optical projection system are tilted or rotated, the light beam emitted by the light source will change drastically. The light beam will easily diverge and lose collimation, resulting in poor picture resolution.

Contents of the invention

One purpose of this application is to provide a new technical solution for an optical projection system and electronic equipment.

According to a first aspect of embodiments of the present application, an optical projection system is provided. The optical projection system includes:

Light source module;

At least one scanning mirror, at least one scanning mirror is located on the light exit side of the light source module;

Afocal component, at least one of the scanning mirrors is located on the light incident side of the afocal component, the afocal component includes at least two sets of lens groups, the optical powers of at least two sets of lens groups are positive, and Each lens group includes at least one lens, the light exit surface and the light entrance surface of the lens are both arranged axially symmetrically with respect to the optical axis.

Optionally, the afocal component includes two lens groups, and the two lens groups include a first lens group and a second lens group, wherein the first lens group is closer to the afocal component than the second lens group. The light incident side; the equivalent focal length of the first lens group is smaller than the equivalent focal length of the second lens group.

Optionally, each lens group includes two of the lenses, one lens has a smaller dispersion coefficient than the other lens, and the optical power of the lens with a smaller dispersion coefficient is negative.

Optionally, the two lenses include a first lens and a second lens, and the first lens and the second lens have opposite optical powers.

Optionally, the optical projection system includes two scanning mirrors, one of which is located on the light entrance side of the afocal component, and the other one of which is located on the light exit side of the afocal component; two of them are The scanning directions of the scanning mirrors are orthogonal to each other.

Optionally, the optical projection system includes a scanning mirror, the scanning mirror 2 is located on the light incident side of the afocal component, the scanning mirror has two rotating axes, and the scanning mirror moves along the Two spindles rotate to project a two-dimensional image.

Optionally, the light source module includes: a light source group, a beam adjustment module and at least one third lens. The beam adjustment module is located on the light exit side of the light source group to adjust the light beam emitted by the light source group;

The third lens is located on the light exit side of the beam adjustment module. The third lens is used to transmit the light beam to the scanning mirror. Both the light exit surface and the light entrance surface of the third lens are asymmetrical with respect to the optical axis. set up.

Optionally, the optical projection system further includes an entrance pupil, which is disposed between the afocal component and the scanning mirror, and the scanning mirror is located on the light exit side of the light source module. .

Optionally, the afocal component further includes a plane mirror group, and the plane mirror group is located between two adjacent lens groups.

According to a second aspect of the embodiment of the present application, an electronic device is provided, and the electronic device includes the optical projection system as described in the first aspect.

In an embodiment of the present application, an optical projection system is provided. This application sets an afocal component on the light exit side of the scanning reflection 2. The afocal component includes a lens group with positive refractive power, and the lens group uses a lens whose light exit surface and light entrance surface are both axially symmetrical with respect to the optical axis, reducing the optical The sensitivity of the projection system improves the operability of the optical projection system.

Other features of the present application and their advantages will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings.

Description of drawings

In order to explain the embodiments of the present application or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are part of the drawings of this application. For those of ordinary skill in the art, other drawings can be obtained based on the provided drawings without exerting creative efforts.

Figure 1 shows a schematic structural diagram of the optical projection system of the present application.

Figure 2 shows the second structural schematic diagram of the optical projection system of the present application.

Figure 3 shows the third structural schematic diagram of the optical projection system of the present application.

Explanation of reference symbols:

1. Light source module; 10. Light source group; 101. First light source; 102. Second light source; 103. Third light source; 11. Collimating lens group; 12. Light combining component; 121. First light combining piece; 122. The second light combining piece; 123. The third light combining piece; 13. The third lens; 2. Scanning mirror; 21. The first scanning mirror; 22. The second scanning mirror; 3. Afocal component; 31. First lens group; 32. Second lens group; 311. First lens; 312. Second lens; 4. Entrance pupil; 5. Exit pupil.

Detailed ways

Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions, and numerical values set forth in these examples do not limit the scope of the present application unless otherwise specifically stated.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application or its application or uses.

Techniques and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques and equipment should be considered a part of the specification.

In all examples shown and discussed herein, any specific values are to be construed as illustrative only and not as limiting. Accordingly, other examples of the exemplary embodiments may have different values.

It should be noted that similar reference numerals and letters refer to similar items in the following figures, so that once an item is defined in one figure, it does not need further discussion in subsequent figures.

In the existing technology, laser (LASER) is used as the light source of the optical projection system. It has the advantage of small size. However, the light beam emitted by the laser is prone to diffraction (i.e., diffraction phenomenon). The diffraction phenomenon will affect the imaging quality and the picture quality. The poorer the analytical ability. In order to improve the imaging quality, on the one hand, the focal length of the collimating lens group in the light source module can be adjusted to expand the spot size (that is, to expand the pupil size). However, after using this method, the area of the scanning mirror must also follow When the area of the scanning mirror becomes larger, it increases the difficulty of driving the scanning mirror or limits the scanning frequency of the scanning mirror. On the other hand, afocal components can be installed in the optical projection system to expand the spot size. However, in the prior art, afocal systems use reflective optical components and optical focal points that contain optical power (ie, refractive power). For a highly asymmetric lens, as long as the direction of the lens in the afocal component is slightly rotated, the light beam will change drastically. Therefore, the light beam will easily diverge and lose collimation, and the resolution will become worse, so that the sensitivity of the optical system is high and the assembly accuracy is high. Extremely demanding and difficult to adjust.

Based on the above technical problems, this application provides an optical projection system. As shown in FIGS. 1 and 3 , the optical projection system includes: a light source module 1 , at least one scanning mirror 2 , and an afocal component 3 .

In this embodiment, at least one scanning mirror 2 is located on the light exit side of the light source module 1, and at least one scanning mirror 2 is located on the light entrance side of the afocal component 3; the afocal component 3 It includes at least two groups of lens groups, the optical powers of at least two groups of lens groups are positive, and each group of lens groups includes at least one lens, and the light exit surface and the light entrance surface of the lens are axially symmetrical about the optical axis. set up.

In one example, the optical module emits a light beam. The light beam enters the scanning mirror set 2. After being reflected by the scanning mirror 2 of the scanning mirror set 2, it enters the afocal component 3. The beam passing through the afocal component 3 can be directly projected to The human eye either transmits the light beam through the afocal component 3 to the waveguide plate, and the light beam is projected to the human eye through the waveguide plate; or the light beam passes through the afocal component 3 and is then reflected by the scanning mirror 2 and guided to the human eye.

In this embodiment, a microelectromechanical component (electric or piezoelectric, MEMS) is driven to rotate the scanning mirror 2 to construct a two-dimensional image. The final two-dimensional image is projected to the human eye through the afocal component 3 .

In this embodiment, at least two groups of lenses are included, the refractive powers of at least two groups of lens groups are both positive, and each group of lens groups includes at least one lens, and the light exit surface and the light entrance surface of the lens are both positive. They are arranged axially symmetrically about the optical axis. That is, the surface shape of the lens in the lens group is axially symmetrical with the optical axis as the center within the effective diameter. The light-incident surface and the light-emitting surface of the lens (that is, both sides of the object image of the lens) are both axially symmetrical. Compared with the prior art in which the afocal component 3 uses a reflective optical component containing optical power (refractive power) and a lens with asymmetrical optical power, the afocal component 3 of the present application can be composed of a lens that is symmetrical about the optical axis. By reducing the optical sensitivity and assembly difficulty, the optical projection system of the present application is easy to adjust and improves the imaging effect.

In an optional embodiment, the surface shapes of the lenses in the lens group are axially symmetrical with respect to the optical axis, and the optical powers of the lenses in the lens group are arranged axially symmetrically.

In one embodiment, as shown in FIGS. 1 , 2 and 3 , the afocal component 3 includes a first lens group 31 and a second lens group 32 , wherein the first lens group 31 is relative to the third lens group 31 . The second lens group 32 is closer to the light incident side of the afocal component 3 ; the equivalent focal length of the first lens group 31 is smaller than the equivalent focal length of the second lens group 32 .

In this embodiment, the afocal component 3 includes a first lens group 31 and a second lens group 32 . In one example, as shown in FIGS. 1 and 2 , the first lens group 31 and the second lens group 32 each include two lenses. In another example, referring to FIG. 3 , the first lens group 31 and the second lens group 32 each include one lens. The number of lenses included in the first lens group 31 and the second lens group 32 may be the same or different. For example, the first lens group 31 includes one lens, and the second lens group 32 includes two lenses.

In this embodiment, the purpose of expanding the beam diameter is achieved through the afocal component 3 , that is, the spot size is expanded through the afocal component 3 (that is, the pupil size is expanded through the afocal component 3 ), and the light source module 1 is avoided. After expanding the beam diameter, it is necessary to increase the area of the scanning mirror 2 . The afocal component 3 of this application is arranged on the light exit side of the scanning mirror 2. When the light source module 1 transmits parallel light to the scanning mirror 2, the scanning mirror 2 reflects the parallel beam, so that the reflected parallel beam passes through the afocal component 3 The rear beam diameter becomes larger, and when the imaging screen enters the human eye, the imaging quality is improved. The afocal component 3 refers to an optical system that has no net divergence or net focusing of the light beam, that is, the equivalent focal length of the afocal component 3 is infinite, and the incident light is parallel light, so the outgoing light must also be parallel light.

In this embodiment, whether the first lens group 31 and the second lens group 32 include one lens, two lenses, or more lenses, in this embodiment, the first lens group needs to satisfy The equivalent focal length of the first lens group 31 is smaller than the equivalent focal length of the second lens group 32 . The first lens group 31 is arranged closer to the light incident side of the afocal component 3 relative to the second lens group 32 . In this embodiment, the afocal component 3 is used to enlarge the spot size. Specifically, after the light beam passes through the afocal component 3, the afocal component 3 amplifies the beam diameter and images it to the exit pupil 5 (the position of the exit pupil 5 corresponds to the position of the human eye), where the magnification rate of the beam diameter by the afocal component 3 is Determined by the ratio of the equivalent focal lengths of the two lens groups in the afocal component 3, the length of the afocal component 3 (that is, the distance from the light entrance side to the light exit side of the afocal component) is positively related to the sum of the focal lengths. This embodiment limits the equivalent focal length of the first lens group 31 to be smaller than the equivalent focal length of the second lens group 32, that is, the ratio of the equivalent focal length of the first lens group 31 to the equivalent focal length of the second lens group 32 is less than 1, so that The diameter of the beam incident into the afocal component 3 is made smaller than the diameter of the beam emitted into the afocal component 3 , so that the beam diameter of the incident beam becomes larger after passing through the afocal component 3 provided in this embodiment.

In one embodiment, as shown in FIGS. 1 and 2 , each lens group includes two of the lenses, one lens has a smaller dispersion coefficient than the other lens, and the lens has a smaller dispersion coefficient. The optical power is negative.

In this embodiment, as shown in FIGS. 1 and 2 , each lens group includes two lenses, and the light exit surfaces and light entrance surfaces of the two lenses are arranged axially symmetrically with respect to the optical axis. Each lens group includes two lenses, one of which is close to the light incident side of the afocal component 3 and the other lens is close to the light exit side of the afocal component 3 . In one embodiment, the dispersion coefficient of the lens close to the light incident side of the afocal component 3 may be smaller than the dispersion coefficient of the lens far away from the light incident side of the afocal component 3, where the light of the lens close to the light incident side of the afocal component 3 The power is negative; or in another embodiment, it can be that the dispersion coefficient of the lens far away from the light incident side of the afocal component 3 is smaller than the dispersion coefficient of the lens close to the light incident side of the afocal component 3, where the dispersion coefficient is far away from the afocal component 3 The optical power of the lens on the light incident side is negative.

In this embodiment, in order to solve the problem of refractive chromatic aberration, the lens group of the afocal component 3 includes at least one lens made of a material with a low dispersion coefficient. That is to say, one lens is limited to have a smaller dispersion coefficient than the other lens, and the refractive power of the lens with a smaller dispersion coefficient is negative to eliminate refractive chromatic aberration. In a specific embodiment, referring to FIG. 1 , it can be defined that the dispersion coefficient of the second lens 312 is smaller than the dispersion coefficient of the first lens 311 , that is, the refractive index of the second lens 312 is greater than the refractive index of the first lens 311 . to eliminate the problem of refractive chromatic aberration. Specifically, refractive chromatic aberration can be eliminated by pairing a high-abbe lens with a low-abbe lens. In one example, the dispersion coefficient of the second lens 312 is 15<Vd<35.

In an optional embodiment, as shown in FIG. 3 , each lens group includes a lens, and the light exit surface and the light entrance surface of the lens are arranged symmetrically about the optical axis. When each lens group only includes one lens and the lens group in the afocal component 3 does not have the ability to correct chromatic aberration, the light source module 1 can be limited to emit light sources of different colors and the corresponding collimating lens. distance (distance along the optical axis) to compensate for chromatic aberration. The distance between different light sources and their corresponding collimating lenses is different, and the distance difference is less than 0.3mm.

In one example, the light source module 1 includes a first light source 101, a second light source 102 and a third light source 103, where the first light source 101 emits red light, the second light source 102 emits green light, and the third light source 103 emits blue light.

In one embodiment, the two lenses include a first lens 311 and a second lens 312, and the first lens 311 and the second lens 312 have opposite optical powers.

In this embodiment, the optical powers of the first lens 311 and the second lens 312 are opposite, but the overall optical power of the first lens group 31 and the second lens group 32 formed by the first lens 311 and the second lens 312 is The degrees are all positive. For example, the optical power of the first lens 311 is positive and the optical power of the second lens 312 is negative, or the optical power of the first lens 311 is negative and the optical power of the second lens 312 is positive. The purpose of correcting chromatic aberration is achieved by using lenses with positive power and lenses with negative power and different dispersion coefficients.

In a specific embodiment, each lens group includes two of the lenses, and the two lenses include a first lens 311 and a second lens 312. The dispersion coefficient of the second lens 312 is smaller than that of the first lens. The dispersion coefficient of the lens 311 and the refractive power of the second lens 312 are negative to achieve the purpose of eliminating chromatic aberration.

In one embodiment, as shown in Figures 1 and 3, the optical projection system includes two scanning mirrors 2, one of which is located on the light incident side of the afocal component 3, and the other scanning reflection mirror 2. The mirror 2 is located on the light exit side of the afocal component 3; the scanning directions of the two scanning mirrors 2 are in an orthogonal relationship with each other.

In this embodiment, the optical projection system includes two scanning mirrors 2. Referring to FIGS. 1 and 3 , the two scanning mirrors 2 include a first scanning mirror 21 and a second scanning mirror 22 . The first scanning mirror 21 is located on the light exit side of the light source module 1 , the afocal component 3 is located on the light exit side of the first scanning mirror 21 , and is located on the light incident side of the second scanning mirror 22 .

In one example, the light source module 1 emits a parallel beam. The parallel beam enters the first scanning mirror 21 and is still a parallel beam after being reflected by the mirror surface of the first scanning mirror 21. The reflected parallel beam passes through the afocal The component 3 is then reflected by the second scanning mirror 22 and guided out of the pupil 5 and projected to the human eye or the optical waveguide.

In this embodiment, a microelectromechanical component (MEMS) is driven to rotate the first scanning mirror 21 to allow the beam to scan in the first dimension, and the second scanning mirror 22 is used to scan in a direction orthogonal to the first dimension. to construct a two-dimensional picture. Specifically, the light emission direction of the light beam reflected by the first scanning mirror 21 is the first direction, and the light emission direction of the reflected light beam by the second scanning mirror 22 is the second direction. The first direction and the second direction are perpendicular. For example, both the first scanning mirror 21 and the second scanning mirror 22 perform uniaxial scanning. In one example, the scanning mirror 2 is arranged on a base, and the base and the driving device are both arranged on the base plate. The driving device drives the base to rotate on the base plate. The base is set on the base and can rotate with the rotation of the base. The scanning mirror 2 The structure of 2 includes but is not limited to this, as long as the rotation of the scanning mirror 2 can be realized.

In one embodiment, as shown in Figure 2, the optical projection system includes a scanning mirror 2, which is located on the light incident side of the afocal component 3. The scanning mirror 2 has two The scanning mirror 2 rotates along the two rotating axes to project a two-dimensional image.

In this embodiment, only one scanning mirror 2 is included in the optical projection system. Referring to Figure 2, the scanning mirror 2 is located on the light incident side of the afocal system.

In one example, the light source module 1 emits a parallel beam. The parallel beam enters the first scanning mirror 21 and is still a parallel beam after being reflected by the mirror surface of the first scanning mirror 21. The reflected parallel beam passes through the afocal Component 3 is projected to the human eye or optical waveguide.

In this embodiment, a microelectromechanical component (MEMS) is driven to rotate the scanning mirror 2. The scanning mirror 2 has two rotating axes, and the scanning mirror 2 rotates around the two rotating axes at high speed (that is, the scanning mirror 2 has a two-axis scanning degree of freedom), the scanning mirror 2 can directly scan a two-dimensional image.

In one embodiment, the light source module 1 includes: a light source group 10, a beam adjustment module and at least a third lens 13. The beam adjustment module is located on the light exit side of the light source group to adjust the light beam emitted by the light source group. Adjust; the third lens 13 is located on the light exit side of the beam adjustment module. The third lens 13 is used to transmit the light beam to the scanning mirror 2. The light exit surface and the light entrance surface of the third lens 13 All are arranged asymmetrically about the optical axis.

In one embodiment, the light source group 10 includes three light sources, which are a first light source 101, a second light source 102, and a third light source 103 respectively. The first light source 101 may emit red light, the second light source 102 may emit green light, and the third light source 103 may emit blue light. It should be noted that the first light source 101 is not limited to red light, the second light source 102 is not limited to green light, and the third light source 103 is not limited to green light.

In this embodiment, the first light source 101, the second light source 102 and the third light source 103 respectively emit light beams, and the light beam adjustment module adjusts the light beams respectively emitted by the first light source 101, the second light source 102 and the third light source 103. The final light beam is transmitted to the scanning mirror 2 through the third lens 13 .

In this embodiment, the light exit surface and the light entrance surface of the third lens 13 are both asymmetrically arranged with respect to the optical axis, that is, the third lens 13 is a lens group with asymmetric optical power (refractive power) to adjust the light spot shape. , adjust the oval light spot to a circular light spot. Specifically, because the spot of the laser after passing through the collimating lens is elliptical, it needs to be adjusted into a circle to avoid poor resolution in the short side direction. In this embodiment, the light source module 1 includes a third lens 13 . In order to further adjust the shape of the light spot, the light source module 1 may further include two third lenses 13 or multiple third lenses 13 .

In one example, the third lens 13 with an asymmetric structure may be a cylindrical lens with a single-dimensional optical power (refractive power), where the single-dimensional optical power (refractive power) refers to a refractive power in only one direction, and the refractive power in the other direction. There is no bending force in the direction. Either a freeform surface with power (refractive power) in both dimensions, or a prism in which the power in the two dimensions is not the same.

In an optional embodiment, the beam adjustment module includes a collimating lens group 11 and a light combining component 12, where the collimating lens group 11 includes a first collimating lens, a second collimating lens and a third collimating lens; light combining The component 12 includes a first light combining sheet 121 , a second light combining sheet 122 and a third light combining sheet 123 .

The first collimating lens is arranged corresponding to the first light source 101, and the first light combining sheet 121 is arranged corresponding to the first collimating lens. The second collimating lens is disposed corresponding to the second light source 102, and the second light combining sheet 122 is disposed corresponding to the second collimating lens. The third collimating lens is arranged corresponding to the third light source 103, and the third light combining sheet 123 is arranged corresponding to the third collimating lens. The first light source 101 emits a first beam, and the first beam passes through the first collimating lens and then enters the first light combiner 121; the second light source 102 emits a second beam, and the second beam passes through the second collimator lens and then enters the second combiner. Light sheet 122; the third light source 103 emits a third beam, and the third beam passes through the third collimating lens and then enters the third light combining sheet 123. The first light combining sheet 121, the second light combining sheet 122 and the third light combining sheet 123 guide the first light beam, the second light beam and the third light beam to be coaxial, and the adjusted first light beam, the second light beam and the third light beam pass through The third lens 13 with asymmetric optical power (refractive power) adjusts the spot shape, and then the light beam with the changed spot shape is transmitted to the scanning mirror 2 . In one example, the first light combining sheet 121, the second light combining sheet 122 and the third light combining sheet 123 may respectively be composed of dichroic mirrors.

In one embodiment, the optical projection system further includes an entrance pupil 4. The entrance pupil 4 is provided between the afocal component 3 and the scanning mirror 2. The scanning mirror 2 is located at The light output side of the light source module 1. For example, the entrance pupil 4 can be an aperture stop.

In one embodiment, the afocal component 3 further includes a plane mirror group (not shown in the figure), and the plane mirror group is located between two adjacent lens groups. In this embodiment, the afocal component 3 also includes a planar mirror group, wherein the planar mirror group includes a retroreflector without optical power (refractive power). (refractive power) back reflector to achieve the purpose of shrinking the optical projection system.

According to a second aspect of the embodiment of the present application, an electronic device is provided. The electronic device includes the optical projection system as described in the first aspect. For example, electronic devices are used in near-eye displays, augmented reality or projection systems. For example, the electronic device may be a smart head-mounted device.

The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not inconsistent, they can be combined to form a better embodiment. Considering the simplicity of the writing, they will not be discussed here. Repeat.

Although some specific embodiments of the present application have been described in detail through examples, those skilled in the art will understand that the above examples are for illustration only and are not intended to limit the scope of the present application. Those skilled in the art will understand that the above embodiments can be modified without departing from the scope and spirit of the application. The scope of the application is defined by the appended claims.

Claims

An optical projection system, characterized in that the optical projection system includes:

Light source module(1);

At least one scanning mirror (2), at least one scanning mirror (2) is located on the light exit side of the light source module (1);

Afocal component (3), at least one of the scanning mirrors (2) is located on the light incident side of the afocal component (3), the afocal component (3) includes at least two sets of lens groups, at least two sets of The optical power of the lens groups is all positive, and each lens group includes at least one lens. The light exit surface and the light entrance surface of the lens are both arranged axially symmetrically with respect to the optical axis.
The optical projection system according to claim 1, characterized in that the afocal component (3) includes a first lens group (31) and a second lens group (32), wherein the first lens group (31) Closer to the light incident side of the afocal component (3) than the second lens group (32);

The equivalent focal length of the first lens group (31) is smaller than the equivalent focal length of the second lens group (32).
The optical projection system according to claim 1 or 2, characterized in that each lens group includes two of the lenses, one lens has a smaller dispersion coefficient than the other lens, and has a smaller dispersion coefficient The optical power of the lens is negative.
The optical projection system according to claim 3, characterized in that the two lenses include a first lens (311) and a second lens (312), and the first lens (311) and the second lens (311) 312) has the opposite optical power.
The optical projection system according to claim 1, characterized in that the optical projection system includes two scanning mirrors (2), one of which is located at the incident light side of the afocal component (3). On the other side, another scanning mirror (2) is located on the light exit side of the afocal component (3); the scanning directions of the two scanning mirrors (2) are in an orthogonal relationship with each other.
The optical projection system according to claim 1, characterized in that the optical projection system includes a scanning mirror (2), the scanning mirror (2) is located on the light incident side of the afocal component (3) , the scanning mirror (2) has two rotating axes, and the scanning mirror (2) rotates along the two rotating axes to project a two-dimensional image.
The optical projection system according to claim 1, characterized in that the light source module (1) includes: a light source group (10), a beam adjustment module and at least one third lens (13),

The beam adjustment module is located on the light exit side of the light source group (10) to adjust the beam emitted by the light source group (10);

The third lens (13) is located on the light exit side of the beam adjustment module. The third lens (13) is used to transmit the light beam to the scanning mirror (2). The light exit of the third lens (13) Both the surface and the light-incident surface are arranged asymmetrically about the optical axis.
The optical projection system according to claim 1, characterized in that the optical projection system further includes an entrance pupil (4), which is provided between the afocal component (3) and the scanning mirror (2). There is the entrance pupil (4), and the scanning mirror (2) is located on the light exit side of the light source module (1).
The optical projection system according to claim 1, characterized in that the afocal component (3) further includes a plane reflecting mirror group, and the plane reflecting mirror group is located between two adjacent lens groups.
An electronic device, characterized in that the electronic device includes the optical projection system according to any one of claims 1-9.