WO2022105687A1

WO2022105687A1 - Optical system and wearable device

Info

Publication number: WO2022105687A1
Application number: PCT/CN2021/130333
Authority: WO
Inventors: 汤伟平
Original assignee: 维沃移动通信有限公司
Priority date: 2020-11-19
Filing date: 2021-11-12
Publication date: 2022-05-27
Also published as: CN112230435A

Abstract

Disclosed in the present application are an optical system and a wearable device. The optical system comprises: a light source; a compensation lens group, wherein the compensation lens group is arranged on a light transmission path of the light source, an incident surface of the compensation lens group is opposite an emergent surface of the light source, and the compensation lens group performs first light-path adjustment on light emitted from the light source; a waveguide, wherein the waveguide is provided with a target incident surface, a first light guiding part and a target emergent surface, the target incident surface is opposite an emergent surface of the compensation lens group, and the first light guiding part is positioned between the target incident surface and the target emergent surface; and a reflection unit, wherein a reflection surface of the reflection unit is opposite the target emergent surface, and the reflection unit performs second light-path adjustment on light subjected to the first light-path adjustment so as to reflect parallel light.

Description

Optical Systems and Wearables

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Chinese Patent Application No. 202011306668.0, filed on November 19, 2020, entitled "Optical Systems and Wearable Devices", the entire contents of which are incorporated herein by reference.

technical field

The present application belongs to the technical field of augmented reality glasses optics, and in particular relates to an optical system and a wearable device having the optical system.

Background technique

In the related art, after the light is transmitted through the waveguide, a dispersion phenomenon occurs. In the field of Augmented Reality (AR), light is introduced from one end of the waveguide through a collimating lens and exported from the other end of the waveguide. Due to the dispersion of light during the transmission process, it is difficult for the human eye to see the complete part of the light derived from the waveguide. light, resulting in the absence of virtual images. At present, there is a plan to solve this problem by increasing the diameter of the collimating lens, but the increase in the diameter of the collimating lens will affect the overall size and shape design of the product.

In addition, if a corner reflector is used to adjust the light transmission path, since the corner reflector has an angular structure, the angular structure will scatter the light during the light transmission process, resulting in degraded image quality.

SUMMARY OF THE INVENTION

The present application aims to provide an optical system and a wearable device, at least solving one of the problems that it is difficult for the human eye to see the complete virtual image derived from the waveguide and the image quality is difficult to control.

In the first aspect, an embodiment of the present application proposes an optical system, comprising: a light source; a compensation mirror group, the compensation mirror group is arranged on the light transmission path of the light source, the incident surface of the compensation mirror group is opposite to the exit surface of the light source, and the compensation mirror group is arranged on the light transmission path of the light source. The group adjusts the first optical path of the light emitted by the light source; the waveguide, the waveguide is provided with a target incident surface, a first light guide portion and a target exit surface, the target incident surface is opposite to the exit surface of the compensation mirror group, and the first light guide portion is located at the target. between the incident surface and the target exit surface; a reflective unit, the reflective surface of the reflective unit is opposite to the target exit surface, and the reflective unit adjusts the second optical path of the light adjusted by the first optical path to reflect parallel light; wherein, the light emitted by the light source It is transmitted to the compensating mirror group, and after adjusting the optical path of the compensating mirror group, it is emitted from the exit surface of the compensating mirror group, and transmitted from the target incident surface to the waveguide, and exits from the target exit surface. The reflection unit reflects the light emitted from the target exit surface. The parallel light is transmitted to the first light guide part, and the first light guide part guides the light reflected by the reflection unit out of the waveguide.

In a second aspect, an embodiment of the present application provides a wearable device, including the optical system of the foregoing embodiment.

In the embodiments of the present application, a compensating mirror group is arranged on the target incident surface of the waveguide, and a reflection unit is arranged on the target exit surface of the waveguide. The target exit surface of the waveguide is led out. After the light is adjusted by the second optical path through the reflection unit, the reflected light is parallel light. The parallel light is reflected by the first light guide part. You can see the complete high-quality virtual image. The optical system can effectively ensure the integrity of light transmission, reduce light loss, ensure image quality, and improve the viewing experience of human eyes by adjusting the light path twice.

Additional aspects and advantages of the present application will be presented in parts of the following description, in part will be apparent from the following description, or will be learned by practice of the application.

Description of drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily understood from the following description of embodiments in conjunction with the accompanying drawings, wherein:

1 is a schematic diagram of an optical system in the related art;

2 is a schematic diagram of another optical system in the related art;

3 is a schematic diagram of an optical system according to an embodiment of the present application;

Fig. 4 is the schematic diagram of another angle of the optical system shown in Fig. 3;

5 is a schematic diagram of light transmission of an optical system according to an embodiment of the present application;

6 is a schematic diagram of an optical system according to another embodiment of the present application.

Reference number:

Optical system 100; Human eye 200;

light source 10;

Compensating lens group 20; collimating unit 21; lens unit 22;

waveguide 30; target incident surface 31; target exit surface 32;

reflection unit 40;

the first light guide part 50;

the second light guide portion 60;

The third light guide portion 70 .

Detailed ways

The following will describe in detail the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, but should not be construed as a limitation on the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

The features of the terms "first" and "second" in the description and claims of this application may expressly or implicitly include one or more of such features. In the description of this application, unless stated otherwise, "plurality" means two or more.

In the description of this application, it is to be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by vertical, horizontal, top, bottom, inside, and outside are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying It is described, rather than indicated or implied, that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the application.

In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood in specific situations.

The present application is an invention created by the inventor based on the following facts.

At present, the light projected by the projection device can be guided into the human eye after being transmitted through the waveguide, so that the human eye can see the virtual image projected by the projection device. However, as shown in Fig. 1, after passing through the collimating lens a, the light is introduced into the waveguide b from the introduction part of the waveguide b, propagates in the waveguide b, and is derived from the exit part c at the other end. Viewing from the export position, you can see the virtual image. However, if the aperture of the collimating lens a is too small, the light from the marginal viewing angle will be separated at the exit position of the light, and cannot be seen by the human eye at the same time, resulting in an incomplete virtual image seen by the human eye.

In order to overcome this problem, the related one-dimensional pupil dilation scheme usually increases the aperture of the collimating lens a (as shown in Figure 2), so that the light passing through the positions on both sides of the collimating lens is transmitted to the other end of the waveguide b. As the center moves closer to the middle, the light can finally be derived from the middle position of the derivation part c, and the human eye can see the full virtual image at the middle position corresponding to the derivation part c. However, this solution will result in a large collimating lens, making it difficult to control the overall size of the product and affecting the aesthetics of the product.

In addition, in some solutions, a corner reflector is provided at one end of the waveguide, and the corner reflector can reflect the light transmitted by the waveguide, thereby adjusting the light transmission path. However, corner reflectors usually have angular structures. These angular structures are usually non-active areas during the light reflection process. The non-active areas not only cannot perform effective optical path adjustment, but also scatter light during light transmission, resulting in imaging. The image quality is degraded, affecting the viewing effect of the human eye.

Based on this, the inventor of the present application creatively obtained the optical system 100 and the AR device of the present application through long-term research and experiments.

The optical system 100 according to the embodiment of the present application is described below with reference to FIGS. 3-5 .

As shown in FIG. 3 , the optical system 100 according to some embodiments of the present application includes: a light source 10 , a compensation mirror group 20 , a waveguide 30 and a reflection unit 40 .

Specifically, the compensation lens group 20 is arranged on the light transmission path of the light source 10, the incident surface of the compensation lens group 20 is opposite to the exit surface of the light source 10, and the compensation lens group 20 adjusts the first optical path of the light emitted by the light source 10. The waveguide 30 is provided with a target incident surface 31 , a first light guide portion 50 and a target exit surface 32 . The target incident surface 31 is opposite to the exit surface of the compensation mirror group 20 , and the first light guide portion 50 is located on the target incident surface 31 and the target exit surface. between 32. The reflection surface of the reflection unit 40 is opposite to the target exit surface 32 , and the reflection unit 40 performs second optical path adjustment on the light after the first optical path adjustment to reflect parallel light. The light emitted by the light source 10 is transmitted to the compensation lens group 20 , and after the optical path is adjusted by the compensation lens group 20 , it is emitted from the output surface of the compensation lens group 20 , and transmitted from the target incident surface 31 to the waveguide 30 , and from the target output surface 32 After exiting, the reflection unit 40 reflects the light emitted from the target exit surface 32 into parallel light and transmits it to the first light guide part 50 , and the first light guide part 50 guides the light reflected by the reflection unit 40 out of the waveguide 30 .

In other words, the optical system 100 according to the embodiment of the present application is mainly composed of a light source 10 capable of emitting imaging light, a compensation lens group 20 for adjusting the first optical path of the light emitted by the light source 10, and a waveguide for transmitting the light after the first optical path adjustment. 30 , and the reflection unit 40 that can adjust the second optical path for the light derived from the waveguide 30 and reflect the light after the second optical path adjustment back to the waveguide 30 . The light source 10 may be a projection device capable of projection. The light emitted by the light source 10 is guided from the target incident surface 31 of the waveguide 30 to the target exit surface 32 of the waveguide 30 after the first optical path adjustment is performed by the compensation lens group 20 . The reflection unit 40 adjusts the second optical path of the light emitted by the waveguide 30, so that the light reflected from the reflection unit 40 back to the waveguide 30 is parallel light, and the parallel light is in the waveguide 30. It is transmitted to the first light guide portion 50, and finally reflected by the first light guide portion 50 and then exported from the first side of the waveguide 30 (eg, the upper surface in FIG. 3).

The human eye 200 can view the light guided by the first light guide part 50 from the first side of the waveguide 30. Since the light is adjusted by the compensation lens group 20 before entering the waveguide 30, the first light path is adjusted when it passes through the reflection unit 40. The second optical path adjustment is performed by the reflection unit 40, and the mutual compensation of the two optical path adjustments can make the light reflected from the reflection unit 40 to the first light guide part 50 be parallel light, so that the light from the first light guide part 50 The derived light is basically consistent with the image of the light emitted from the light source 10 , and the human eye 200 can see the complete virtual image projected by the light source 10 when viewed at the output position of the first light guide portion 50 .

It should be noted that the first optical path adjustment and the second optical path adjustment referred to in this application refer to adjusting the transmission path of the light, so that the light is transmitted under the set optical path, so that the final imaging meets the viewing requirements. The first optical path adjustment and the second optical path adjustment do not limit the number of adjustments to the light transmission path, that is, whether it is the first optical path adjustment or the second optical path adjustment, the adjustment of the light transmission path can be performed only once, or it can be Make multiple adjustments to the transmission path of the light.

Therefore, according to the optical system 100 of the embodiment of the present application, by arranging the compensating mirror group 20 on the target incident surface 31 of the waveguide 30 and arranging the reflecting unit 40 on the target exit surface 32 of the waveguide 30, the light emitted by the light source 10 passes through the compensating mirror group 20 After the first optical path adjustment is performed, it is transmitted through the waveguide 30 and is derived from the target exit surface 32 of the waveguide 30. After the second optical path adjustment is performed by the reflection unit 40, the reflected light is parallel light, and the parallel light passes through the first light guide. The reflection of the part 50, the human eye can see a complete and high-quality virtual image from the lead-out position of the first light guide part 50. The optical system 100 can effectively ensure the integrity of the light transmission, reduce the light loss, ensure the image quality, and improve the viewing experience effect of the human eye by adjusting the optical path of the light twice.

According to an embodiment of the present application, the first optical path is adjusted to converge light, and the second optical path is adjusted to diverge, or the first optical path is adjusted to diverge, and the second optical path is adjusted to converge.

Optionally, the parameters of the compensation mirror group 20 are matched with the parameters of the reflection unit 40 .

That is to say, as shown in FIG. 4 and FIG. 5 , the compensation lens group 20 may be a lens module for condensing the light transmitted by the light source 10 . In this case, the first optical path adjustment realized by the compensation lens group 20 may be It is to condense the light, that is, the light emitted by the light source 10 converges after passing through the compensation mirror group 20, and the converged light enters the waveguide 30 from the target incident surface 31 of the waveguide 30, transmits in the waveguide 30, and exits from the target exit surface 32. towards the reflection unit 40. Correspondingly, the reflection unit 40 is a lens module that can diverge the converged light. After the converged light is adjusted in the second optical path of the reflecting unit 40 , the originally converged light diverges, so that the reflected light is reflected from the reflecting unit 40 . The light emitted is parallel light.

The compensation lens group 20 can also be a lens module that diverges the light transmitted by the light source 10 . In this case, the first optical path adjustment realized by the compensation lens group 20 is to diverge the light, that is, the light emitted by the light source 10 Divergence occurs after passing through the compensating mirror group 20 . The divergent light enters the waveguide 30 from the target incident surface 31 of the waveguide 30 , travels in the waveguide 30 , and is emitted from the target exit surface 32 to the reflection unit 40 . Correspondingly, the reflection unit 40 is a lens module that can condense the divergent light. After the divergent light is adjusted in the second optical path of the reflection unit 40, the originally diverged light is converged, so that the reflected light is reflected from the reflection unit 40. The light emitted is parallel light.

Therefore, through the cooperation of the first optical path adjustment and the second optical path adjustment, it can be ensured that the light emitted from the light source 10 is reflected from the first light guide portion 50 to the human eye in the form of parallel light after two optical path adjustments, which can effectively Reduce light scattering during transmission, effectively ensuring the integrity of light transmission.

Optionally, in some specific embodiments of the present application, the compensation lens group 20 includes: a collimating unit 21 and a lens unit 22 .

Specifically, as shown in FIG. 3 , the collimating unit 21 collimates the light emitted by the light source 10 , the lens unit 22 is arranged between the collimating unit 21 and the waveguide 30 , and the lens unit 22 performs the first collimation on the collimated light. Optical path adjustment.

That is to say, the compensation lens group 20 is mainly composed of a collimating unit 21 and a lens unit 22 , wherein the collimating unit 21 can collimate the light emitted by the light source 10 , thereby controlling the transmission path of the light entering the lens unit 22 . The lens unit 22 can adjust the optical path of the collimated light, so as to make the light divergent or converge.

In addition, due to the cooperation of the compensating mirror group 20 and the reflecting unit 40, the projection structure composed of the light source 10 and the compensating mirror group 20 does not need to be designed to be large, and the volume of the whole product can be reduced.

In some specific embodiments of the present application, the lens unit 22 is a cylindrical mirror, and the reflection unit 40 is a cylindrical mirror. The cylindrical mirror adopts a smooth and continuous surface type, which can not only realize the adjustment of the optical path, but also reduce the scattering and loss of light. Return to the original direction to further ensure the imaging effect.

Optionally, the lens unit 22 and the cylindrical mirror are spherical mirrors or aspherical mirrors. Therefore, through the design of the spherical mirror or the aspherical mirror, the optical system 100 can be reasonably adjusted according to the actual structural requirements of the product, and the scope of use can be expanded while ensuring the imaging effect.

According to some optional embodiments of the present application, the light exit surface of the lens unit 22 has the same focal length or curvature as the reflection surface of the cylindrical mirror. Therefore, the adjustment range of the first optical path adjustment can be made to correspond to the adjustment range of the second optical path adjustment, and the compensation effect of the two optical path adjustments can be ensured, so that the reflection unit 40 can reflect the parallel light that meets the requirements.

Optionally, the thickness of the cylindrical mirror is greater than the thickness of the waveguide 30 .

Specifically, as shown in FIG. 3 , the thickness of the cylindrical mirror in the up-down direction is greater than the thickness of the waveguide 30 in the up-down direction, thereby ensuring that the light emitted from the target exit surface 32 of the waveguide 30 to the waveguide 30 can be Cylindrical mirror reflection, thereby further reducing the loss of light and improving image quality.

It should be noted that, by setting the optical parameters of the lens module for the first optical path adjustment and the second optical path adjustment, the structure and principle that the light reflected by the reflection unit 40 is parallel light can be understood by those skilled in the art And it is easy to implement, so it will not be described in detail.

In some optional embodiments of the present application, the collimating unit 21 and the lens unit 22 are integrally formed. Therefore, by arranging the compensation lens group 20 as an integral structure, the structural relationship between the collimating unit 21 and the lens unit 22 can be reasonably designed on the basis of ensuring the light adjustment effect, and the forming is convenient and the structure stability is high.

Optionally, according to an embodiment of the present application, the light source 10 is provided on the first side of the waveguide 30, the target incident surface 31 is provided on the first side of the waveguide 30, and the optical system 100 further includes a second light guide portion 60, a second light guide portion 60, and a second light guide portion 60. The light guide portion 60 is arranged in the waveguide 30 , and the light guide surface of the second light guide portion 60 faces the light exit surface of the light source 10 . 60 is reflected to the second end of the waveguide 30 , wherein the side surface of the first side of the waveguide 30 and the end surface of the second end of the waveguide 30 are adjacent surfaces.

Specifically, as shown in FIG. 3 , the light source 10 is arranged above the waveguide 30 , the target incident surface 31 is located on the upper surface of the waveguide 30 , and the compensation mirror group 20 is arranged between the light source 10 and the target incident surface 31 . The left end of the waveguide 30 is provided with a second light guide portion 60 , and the light guide surface of the second light guide portion 60 faces the light exit surface of the light source 10 . The face 31 is incident on the waveguide 30 .

The right end face of the waveguide 30 is the target exit surface 32 , the reflection unit 40 is arranged at the right end of the waveguide 30 , and the reflection surface of the reflection unit 40 is arranged opposite to the target exit surface 32 . The light after the adjustment of the first optical path is transmitted from left to right in the waveguide 30, and is emitted from the target exit surface 32 to the reflection unit 40. The reflection unit 40 adjusts the second optical path of the light, and reflects the light after the adjustment of the second optical path. The first light guide portion 50 in the echo guide 30 is then reflected by the first light guide portion 50 to the position where the human eye 200 is located.

Therefore, by arranging the second light guide portion 60, the arrangement structure of the light source 10 and the compensation lens group 20 is more reasonable.

In some specific embodiments of the present application, the optical system 100 further includes: a third light guide part 70 , the third light guide part 70 is arranged in the waveguide 30 , and the light guide surface of the third light guide part 70 faces the surface of the reflection unit 40 . The reflection surface, the target exit surface 32 is arranged on the first side or the second side of the waveguide 30,

The light emitted by the light source 10 is transmitted from the target incident surface 31 to the waveguide 30 after the first optical path adjustment is performed by the compensation mirror group 20 , and then transmitted through the third light guide portion 70 and emitted from the target exit surface 32 . The reflection unit 40 will The light emitted from the target exit surface 32 is transmitted to the third light guide portion 70 , and then the third light guide portion 70 transmits the light to the first light guide portion 60 , and the first light guide portion 60 reflects the third light guide portion 70 The light leads out of the waveguide 30, the second side is opposite to the first side.

As shown in FIG. 6 , compared with the above-mentioned embodiment, in this embodiment, a third light guide portion 70 is provided between the right end of the waveguide 30 and the first light guide portion 50 , and the third light guide portion 70 may be Single-sided reflection structure, the target exit surface 32 is set on the lower surface of the waveguide 30, and the left surface of the third light guide part 70 can transmit the light transmitted through the second light guide part 60 to the right end of the waveguide 30 from the lower surface of the waveguide 30 Derived, the reflection unit 40 can be correspondingly disposed on the lower surface of the right end of the waveguide 30, the reflection unit 40 reflects the light reflected by the third light guide part 70 back to the third light guide part 70, and then the third light guide part 70 It is reflected to the first light guide portion 50 , and finally is reflected by the right side surface of the first light guide portion 50 , and is derived from the upper surface of the waveguide 30 . The human eye 200 can view the complete projection of the light source 10 from the exit position of the waveguide 30 . Virtual image.

Therefore, by arranging the third light guide portion 70 in the waveguide 30 , the structure of the optical system 100 is more diversified, the transmission path of the light can be reasonably adjusted according to the actual use requirements, and the transmission integrity of the light can be ensured.

According to an embodiment of the present application, the optical system 100 further includes: a polarization unit (not shown in the figure), the polarization unit is disposed between the target exit surface 32 of the waveguide 30 and the reflection unit 40 .

Specifically, the assembling position of the polarizing unit can be changed according to the assembling position of the reflecting unit 40. By adding a polarizing unit, the light reflected from the reflecting unit 40 back to the waveguide 30 can be changed into required polarized light.

The wearable device according to the embodiment of the present application includes the optical system 100 according to the above-mentioned embodiment. Since the optical system 100 according to the above-mentioned embodiment of the present application has the above-mentioned technical effects, the wearable device according to the embodiment of the present application also has corresponding It can reduce the light loss of the projection equipment during the light transmission process and improve the viewing experience effect of the human eye on the basis of reasonable control of the product size.

The wearable device may be AR glasses, the waveguide 30 may be a lens of the AR glasses, the light source 10 may be a projection device arranged on one temple of the AR glasses, and the reflection unit 40 may be arranged in the middle of the glasses near the bridge of the nose, The light emitted by the light source 10 is transmitted from one end of a lens close to the light source 10 to the other end of the lens close to the bridge of the nose. After being reflected by the reflection unit 40, the light returns to the lens, and is exported from the light export position on the lens to the human eye. The virtual image emitted by the light source 10 can be seen by the eyes.

Other components of the wearable device according to the embodiments of the present application, such as the assembly structure of the projection device and the waveguide, and the operations, are known to those of ordinary skill in the art, and will not be described in detail here.

In the description of this specification, reference to the terms "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples", etc., is meant to incorporate the embodiments A particular feature, structure, material, or characteristic described by an example or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the present application, The scope of the application is defined by the claims and their equivalents.

Claims

An optical system (100), comprising:

light source (10);

Compensation mirror group (20), the compensation mirror group (20) is arranged on the light transmission path of the light source (10), the incident surface of the compensation mirror group (20) and the exit surface of the light source (10) Relatively, the compensation lens group (20) performs a first optical path adjustment on the light emitted by the light source (10);

A waveguide (30), the waveguide (30) is provided with a target incident surface (31), a first light guide portion (50) and a target exit surface (32), the target incident surface (31) and the compensation lens group The exit surfaces of (20) are opposite to each other, and the first light guide portion (50) is located between the target incident surface (31) and the target exit surface (32);

A reflection unit (40), the reflection surface of the reflection unit (40) is opposite to the target exit surface (32), and the reflection unit (40) performs second optical path adjustment on the light adjusted by the first optical path to reflect parallel light;

Wherein, the light emitted by the light source (10) is transmitted to the compensation lens group (20), and after the light path is adjusted by the compensation lens group (20), it is emitted from the exit surface of the compensation lens group (20), and is emitted from the compensation lens group (20). The target incident surface (31) is transmitted into the waveguide (30) and emitted from the target exit surface (32), and the reflection unit (40) reflects the light emitted from the target exit surface (32) The parallel light is transmitted to the first light guide part (50), and the first light guide part (50) guides the light reflected by the reflection unit (40) out of the waveguide (30).
The optical system (100) according to claim 1, wherein the first optical path is adjusted to converge light, the second optical path is adjusted to diverge, or the first optical path is adjusted to converge light Diverging is performed, and the second optical path is adjusted to converge the light.
The optical system (100) according to claim 1, wherein the parameters of the compensation lens group (20) are matched with the parameters of the reflection unit (40).
The optical system (100) according to claim 1, wherein the compensation lens group (20) comprises:

a collimating unit (21), which collimates the light emitted by the light source (10);

A lens unit (22), the lens unit (22) is arranged between the collimating unit (21) and the waveguide (30), and the lens unit (22) performs the first step on the collimated light. A light path adjustment.
The optical system (100) according to claim 4, wherein the lens unit (22) is a cylindrical mirror, and the reflection unit (40) is a cylindrical mirror.
The optical system (100) according to claim 5, wherein the thickness of the cylindrical mirror is greater than the thickness of the waveguide (30).
The optical system (100) according to claim 4, wherein the collimating unit (21) and the lens unit (22) are integrally formed.
The optical system (100) according to claim 1, wherein the light source (10) is provided on a first side of the waveguide (30), and the target incident surface (31) is provided on the waveguide (30) The first side of the optical system (100) further includes:

A second light guide part (60), the second light guide part (60) is arranged in the waveguide (30), and the light guide surface of the second light guide part (60) faces the light source (10) The light emitted by the light source (10) passes through the compensation lens group (20) after the first optical path adjustment and the first optical path adjustment, and is reflected to the waveguide through the second light guide portion (60). the second end of (30),

Wherein, the side surface of the first side of the waveguide (30) and the end surface of the second end of the waveguide (30) are adjacent surfaces.
The optical system (100) of claim 1, further comprising:

A third light guide part (70), the third light guide part (70) is arranged in the waveguide (30), and the light guide surface of the third light guide part (70) faces the reflection unit (40) ), the target exit surface (32) is arranged on the first side or the second side of the waveguide (30),

Wherein, the light emitted by the light source (10) is transmitted from the target incident surface (31) to the waveguide (30) after the first optical path adjustment is performed by the compensation lens group (20), and passes through the The third light guide portion (70) transmits and exits from the target exit surface (32), and the reflection unit (40) transmits the light exiting from the target exit surface (32) to the third light guide part (70), and then the third light guide part (70) transmits the light to the first light guide part (60), and the first light guide part (60) connects the third light guide part (70) The reflected light exits the waveguide (30), the second side being opposite the first side.
The optical system (100) of claim 1, further comprising:

A polarizing unit, the polarizing unit is arranged between the target exit surface (32) and the reflection unit (40).
A wearable device, comprising the optical system (100) of any one of claims 1-10.