Lens and augmented reality device

Abstract

The present application provides a lens and an augmented reality device, wherein the lens includes: a lens barrel, a lens, and a matte sawtooth; the lens is fixed in the lens barrel; the matte sawtooth is arranged on the light-emitting side of each lens, and at least two matte sawtooths are arranged on the light-emitting side of each lens; at least two matte sawtooths are arranged along the optical axis of the lens, and each matte sawtooth is arranged around the inner wall of the lens barrel; any two adjacent matte sawtooths satisfy: after stray light outside the field of view of the lens is irradiated between two adjacent matte sawtooths, the stray light is repeatedly reflected between the two adjacent matte sawtooths. The above scheme, by setting the matte sawtooth and optimizing the shape of the matte sawtooth, makes the stray light repeatedly reflect between the two adjacent matte sawtooths after being irradiated between the two adjacent matte sawtooths, thereby achieving the purpose of absorbing the stray light, thereby reducing the influence of the stray light on the imaging quality of the lens.

Description

Technical Field

[0001] The present application relates to the field of augmented reality technology, and in particular to a lens and an augmented display device. Background Art

[0002] Extended Reality (XR) technology refers to the use of computer technology and sensor devices to integrate virtual content into the user's real environment, thereby creating a new perceptual space. This includes different technologies such as virtual reality (VR), augmented reality (AR) and mixed reality (MR). In the process of implementation, these technologies are closely related to various lenses and sensors.

[0003] The main function of the lens is to focus and adjust the light so that the imaging device can obtain clear, high-quality images. However, during actual imaging, some light outside the lens field of view may enter the lens, which will be reflected multiple times on the inner wall of the lens barrel and eventually enter the photosensitive element to cause overflow light, resulting in a decrease in image quality and even causing halos in the picture. Summary of the invention

[0004] The present application provides a lens and an augmented reality device to reduce the influence of stray light on the lens effect.

[0005] In a first aspect, the present application provides a lens, comprising: a lens barrel, a lens, and a matte sawtooth; wherein:

[0006] The lens is fixed in the lens barrel, the number of the lens is at least one, and when the number of the lens is greater than one, at least two of the lenses are arranged at intervals along the optical axis of the lens;

[0007] The extinction serrations are arranged on the light-emitting side of each lens, and at least two extinction serrations are arranged on the light-emitting side of each lens; the at least two extinction serrations are arranged along the optical axis of the lens, and each of the extinction serrations is arranged around the inner wall of the lens barrel;

[0008] Any two adjacent extinction teeth satisfy the following requirement: after stray light outside the field of view of the lens is irradiated between the two adjacent extinction teeth, the stray light is repeatedly reflected between the two adjacent extinction teeth.

[0009] In the above technical solution, by setting extinction teeth on the light-emitting side of each lens element of the lens and optimizing the shape of the extinction teeth, stray light is irradiated between two adjacent extinction teeth and then repeatedly reflected between the two extinction teeth, thereby achieving the purpose of absorbing stray light, thereby reducing the influence of stray light on the imaging quality of the lens.

[0010] In a possible implementation manner, when the stray light passes through any lens of the lens, the minimum angle at which the stray light deviates from the optical axis of the lens is the minimum stray light deviation angle of the lens;

[0011] The sawtooth surface of any extinction sawtooth facing the light input side of the lens is a first reflection surface, and the sawtooth surface of any extinction sawtooth facing the light output side of the lens is a second reflection surface;

[0012] The minimum stray light deviation angle of any of the lenses is αt; for any extinction sawtooth corresponding to the lens, the angle between the first reflection surface of the extinction sawtooth and the inner wall of the lens barrel close to the imaging end is θ1t, and the angle between the second reflection surface of the extinction sawtooth and the inner wall of the lens barrel close to the object end is θ2t;

[0013] θ1t, θ2t and αt satisfy:

[0014] θ1t≥90°-αt / 2, θ2t≥90°+αt / 4.

[0015] In a possible implementation manner, the smallest minimum stray light deviation angle among all lenses of the lens is αmin, and the largest minimum stray light deviation angle among all lenses of the lens is αmax;

[0016] The first reflection surface of all extinction saw teeth and the second reflection surface of all extinction saw teeth satisfy:

[0017] θ1t≥90°-αmin / 2, θ2t≥90°+αmax / 4.

[0018] In a possible implementation manner, all of the matte saw teeth have the same shape and size.

[0019] In a possible implementation manner, the lens further includes a light shield, and the light shield is fixed to the object end of the lens;

[0020] The light shield is used to block at least part of stray light outside the field of view of the lens from entering the lens.

[0021] In a possible implementation manner, the matte sawtooth is a sharp-angle sawtooth.

[0022] In a possible implementation manner, the matte serrations are integrally formed with the lens barrel.

[0023] In a possible implementation, the lens further includes a matte sleeve, and the matte serrations are located on an inner wall of the matte sleeve;

[0024] The matting sleeve is sleeved and fixed on the inner wall of the lens barrel.

[0025] In a possible implementation, the matting sleeve has an external thread, and the lens barrel has an internal thread;

[0026] The external thread cooperates with the internal thread to fix the matting sleeve on the inner wall of the lens barrel.

[0027] In a second aspect, the present application provides an augmented reality device, including an augmented reality device body, and a lens such as any one of the above-mentioned ones arranged on the augmented reality device body.

[0028] The augmented reality device in the above technical solution sets extinction teeth on the light-emitting side of each lens of the lens, and optimizes the shape of the extinction teeth so that stray light is repeatedly reflected between two adjacent extinction teeth after being irradiated between the two extinction teeth, thereby achieving the purpose of absorbing stray light, thereby reducing the influence of stray light on the imaging quality of the lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is one of the schematic cross-sectional views of the lens in the embodiment of the present application;

[0030] Figure 2 This is one of the principle diagrams of the extinction sawtooth effect in the embodiment of the present application;

[0031] Figure 3 This is the second diagram of the principle of the extinction sawtooth effect in the embodiment of the present application;

[0032] Figure 4 This is the second schematic cross-sectional diagram of the lens in the embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0034] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in one or more embodiments of this specification should be understood by people with ordinary skills in the field to which this disclosure belongs. The "first", "second" and similar words used in one or more embodiments of this specification do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0035] To facilitate understanding of the lens and augmented reality device provided in the embodiments of the present application, the application scenarios thereof are first described. The lens provided in the embodiments of the present application can be applied to an augmented reality device, and in particular, can be applied to the image acquisition part of the augmented reality device.

[0036] The image acquisition part of the augmented reality device is mainly composed of lenses and photosensitive elements. These lenses and photosensitive elements are responsible for capturing images and data of the real world. Among them, the main function of the lens is to focus and adjust the light so that the imaging device can obtain clear and high-quality images.

[0037] The focal length of the lens and the area of ​​the photosensitive element determine the size of the field of view of a lens. Light within the field of view of the lens can pass through the lens to the photosensitive element, and the photosensitive element collects the light information and performs the next step of processing. However, during actual imaging, some light outside the field of view of the lens may also enter the lens. These lights outside the field of view of the lens are stray light. Since this part of the light is not within the field of view of the lens, the stray light cannot be directly transmitted to the photosensitive element and imaged. However, after the stray light enters the lens barrel, it may be reflected multiple times by the inner wall of the lens barrel, and the stray light after reflection may eventually reach the photosensitive element. Once the stray light reaches the photosensitive element, it may cause the light overflow effect of the photosensitive element. In most cases, the light overflow effect is regarded as a defect, which will reduce the image quality of the image and even cause halos to appear in the image.

[0038] To this end, the present application provides a lens, which aims to reduce the influence of stray light on the lens effect by optimizing the lens structure. The lens provided by the present application is specifically introduced below in conjunction with the accompanying drawings.

[0039] To facilitate understanding of the lens provided in the embodiments of the present application, some common descriptions of the lens are first introduced.

[0040] Along the length of the lens, the two opposite ends of the lens are generally the object end and the imaging end. The object end of the lens refers to the front end of the lens, that is, the port where the light enters the lens; while the imaging end of the lens usually refers to the end of the lens, that is, the port where the light finally converges and forms an image after passing through the lens.

[0041] The optical axis of a lens refers to an imaginary line that passes through the center of the lens and extends into the lens. In an optical lens, the optical axis is the central path along which light propagates.

[0042] The field of view of a lens refers to the range of scenes that the lens can capture. During the imaging process, light within the field of view of the lens can be clearly imaged at the object end of the lens after entering the lens, while light outside the field of view of the lens may become stray light after entering the lens and affect the imaging quality of the lens.

[0043] refer to Figure 1 , Figure 1 It is one of the cross-sectional schematic diagrams of the lens in the embodiment of the present application. The lens provided in the embodiment of the present application includes a lens barrel 1, a lens 2 and a matte serration 3. Among them, the lens barrel 1 has a cylindrical accommodation space, and the lens 2 and the matte serration 3 are both arranged in the accommodation space in the lens barrel 1. Specifically, the number of lenses 2 is at least one or two, and when the number of lenses 2 is greater than one, two or more lenses 2 are arranged at intervals along the optical axis L of the lens. After the light enters the lens from the object end of the lens, it is refracted by the lens 2, reaches the imaging end and forms an image on the photosensitive element.

[0044] As for the stray light outside the lens field of view, after entering the lens, it may reach the photosensitive element and affect the imaging effect after being refracted by the lens 2. Therefore, the extinction sawtooth 3 is provided to absorb at least part of the stray light. Figure 2 , Figure 2 This is one of the principle diagrams of the extinction sawtooth effect in the embodiment of this application. Figure 1 and Figure 2 As shown, the extinction serrations 3 are arranged on the light-exiting side of each lens 2, and at least two extinction serrations 3 are arranged on the light-exiting side of each lens 2, and each extinction serration 3 is arranged around the inner wall of the lens barrel 1. Specifically, at least two extinction serrations 3 arranged on the light-exiting side of each lens 2 are arranged at intervals along the optical axis L of the lens. When the extinction serrations 3 are arranged, any two adjacent extinction serrations 3 meet the following conditions: after stray light outside the field of view of the lens is irradiated between two adjacent extinction serrations 3, the stray light is repeatedly reflected between the two adjacent extinction serrations 3 to eliminate at least part of the stray light.

[0045] As a specific example, for the first lens 2 at the object end of the lens, stray light outside the field of view of the lens enters the lens barrel 1 and enters the interior of the lens barrel 1 after being refracted by the first lens 2 at the object end. At this time, some stray light may shine on the inner wall of the lens barrel 1. If not processed, these stray lights may reach the photosensitive element after repeated reflection on the inner wall of the lens barrel 1, thereby affecting the imaging effect. When stray light shines between the two extinction serrations 3, due to the special shape of the extinction serrations 3, the light will be repeatedly reflected between the two extinction serrations 3. Each time the light shines on the surface of the extinction serrations 3, the extinction serrations 3 can absorb a part of the stray light. After multiple reflections, the extinction serrations 3 can be approximately considered to be completely absorbed by the extinction serrations 3, thereby reducing the risk of these stray lights reaching the photosensitive element and causing a decrease in the imaging effect.

[0046] When two or more lenses are arranged in the lens barrel, after the light enters the lens, it is refracted by two or more lenses 2 before reaching the imaging end of the lens. After passing through the lens 2, the stray light may be refracted by several lenses 2 before irradiating the inner wall of the lens barrel 1. Therefore, a matte serration 3 is arranged on the light emitting side of each lens 2. The purpose is to use the matte serration 3 to absorb as much stray light as possible to reduce the influence of the stray light on the imaging effect of the lens.

[0047] It is also worth noting that for the first lens 2 at the object end of the lens, a light extinction sawtooth 3 can also be provided on the light-incoming side of the lens 2 to absorb stray light before it enters the lens. Of course, a light shield can also be installed at the object end of the lens to reduce stray light from entering the lens.

[0048] In the above scheme, by setting the extinction serrations 3 on the light-emitting side of each lens element 2 of the lens, and by optimizing the shape of the extinction serrations 3, stray light is irradiated between two adjacent extinction serrations 3 and then repeatedly reflected between the two extinction serrations 3, thereby achieving the purpose of absorbing stray light, thereby reducing the influence of stray light on the imaging quality of the lens.

[0049] Optionally, when the matt sawtooth 3 is specifically provided, the matt sawtooth 3 may be provided as a sharp-angle sawtooth. Figure 1 The matte sawtooth 3 in the example is a sharp-angle sawtooth. Here, the sharp-angle sawtooth refers to the matte sawtooth 3 whose first reflection surface S1 and second reflection surface S2 meet at the tip of the sawtooth to form a sharp-angle shape.

[0050] By setting the matt sawtooth 3 to a sharp-angle shape, the surface of the matt sawtooth 3 can be fully occupied, and as much of the surface of the matt sawtooth 3 as possible can be set as the first reflection surface S1 or the second reflection surface S2 for absorbing and reflecting the matt sawtooth 3; and by setting the matt sawtooth 3 to a sharp-angle sawtooth, it means that the first reflection surface S1 and the second reflection surface S2 are both set to be planes. This setting can reduce the processing difficulty of the matt sawtooth 3, thereby improving the processing efficiency of the matt sawtooth 3 and saving processing costs.

[0051] When the extinction teeth 3 are specifically arranged, the shape of the extinction teeth 3 can be made to meet certain conditions, thereby achieving repeated reflection of stray light between the extinction teeth 3 .

[0052] For reference Figure 2 and Figure 3 , Figure 3 This is the second diagram of the working principle of the extinction sawtooth in the embodiment of the present application. For the convenience of description, some expressions related to the shape of the extinction sawtooth 3 are defined.

[0053] For the matt serration 3, the matt serration 3 has two serration surfaces, one of which faces the object end of the lens, and the other faces the imaging end of the lens. Here, the serration surface of any matt serration 3 facing the object end of the lens is referred to as the first reflection surface S1, and the serration surface of any matt serration 3 facing the imaging end of the lens is referred to as the second reflection surface S2. For any matt serration 3 located on the side of any lens 2 facing the imaging end of the lens, the angle between the first reflection surface S1 of the matt serration 3 and the side of the inner wall of the lens barrel 1 close to the imaging end is θ1t, and the angle between the second reflection surface S2 of the matt serration 3 and the side of the inner wall of the lens barrel 1 close to the object end is θ2t.

[0054] After stray light passes through lens 2, it always deviates from the optical axis L of the lens. Here, the angle at which stray light deviates from the optical axis L of the lens is called the stray light deviation angle. For a lens, stray light must be multi-angled, and the stray light deviation angles of stray light at different angles after passing through lens 2 are also different. When stray light passes through any lens 2 of the lens, the minimum angle at which stray light deviates from the optical axis L of the lens is the minimum stray light deviation angle of the lens 2. That is, for a lens 2, the stray light deviation angles of all stray light passing through the lens 2 are greater than or equal to the minimum stray light deviation angle of the lens 2. For any lens 2 of the lens, the minimum stray light deviation angle of the lens 2 is indicated by αt.

[0055] As an optional implementation, when the extinction serrations 3 are specifically provided, the relationship between θ1t and θ2t of the extinction serrations 3 corresponding to any lens 2 and the minimum stray light deviation angle αt of the lens 2 satisfies:

[0056] θ1t≥90°-αt / 2, θ2t≥90°+αt / 4.

[0057] Here, the matte sawtooth corresponding to any lens 2 refers to the matte sawtooth 3 located on the side of the lens 2 facing the lens imaging end and located between the lenses 2 adjacent to the lens 2. Figure 1 In the case where multiple lenses 2 are arranged in the lens barrel 1, the extinction serration 3 between two adjacent lenses 2 is the extinction serration corresponding to the lens 2 of the two lenses 2 that is relatively close to the object end of the lens. Figure 1 As shown in , for the lens 2 closest to the imaging end of the lens in the lens barrel 1, the matte serrations 3 corresponding to the lens 2 are the matte serrations 3 between the lens 2 and the photosensitive element. Similarly, if only one lens 2 is provided in the lens barrel 1, the matte serrations 3 corresponding to the lens 2 also refer to the matte serrations 3 between the lens 2 and the photosensitive element. Figure 3 , the derivation process of the above relationship among θ1t, θ2t and αt is introduced in detail.

[0058] First, it should be explained that, since the refractive indices of different lenses 2 in the lens are different, the minimum stray light deviation angles of different lenses 2 are different, so the shapes of the extinction teeth 3 corresponding to different lenses 2 may be different. However, the extinction teeth 3 corresponding to the same lens 2 can be set to the same size and shape to better absorb the stray light on the light-emitting side of the lens 2.

[0059] Figure 3 The figure shows an extreme case between stray light irradiation and extinction sawtooth 3. Figure 3 The deflection angle of the stray light relative to the optical axis L in the illustrated case is the minimum stray light deviation angle αt. When the stray light irradiates the extinction sawtooth 3, the light beam just irradiates the edge of the first reflection surface S1, and then after being reflected by the first reflection surface S1, the light beam propagates parallel to the optical axis L and irradiates the edge of the second reflection surface S2 opposite to the first reflection surface S1, and after being reflected by the second reflection surface S2, the stray light beam is vertically incident on the first reflection surface S1. During the above reflection process, each time the stray light beam irradiates the first reflection surface S1 or the second reflection surface S2, the first reflection surface S1 or the second reflection surface S2 will absorb part of the stray light. If there is still residual stray light after the stray light beam is vertically incident on the first reflection surface S1, it will return along the incident path instead of going deep into the imaging end of the lens.

[0060] Figure 3 The angle at which the stray light deviates from the optical axis L is the minimum stray light deviation angle αt, the angle between the first reflection surface S1 and the wall of the lens barrel 1 is θ1t, and the angle between the second reflection surface S2 and the wall of the lens barrel 1 is θ2t. Since the propagation direction of the light after the first reflection from the first reflection surface S1 is parallel to the optical axis L, and the incident angle is equal to the reflection angle in the reflection of the light, it can be inferred that the incident angle of the stray light when it first enters the first reflection surface S1 is αt / 2, and further it can be inferred that θ1t=90°-αt / 2. Since the stray light is perpendicular to the second reflection surface S2 when the stray light enters the first reflection surface S1 for the second time, it can be inferred that the incident angle of the stray light when it first enters the second reflection surface S2 is αt / 4, and further it can be inferred that θ2t=90°+αt / 4.

[0061] Figure 3 The stray light deviation angle of the stray light shown in FIG. 1 is the minimum stray light deviation angle αt, that is, Figure 3At the position shown in , the stray light deviation angles of all stray lights are greater than or equal to αt. For stray lights with a stray light deviation angle greater than αt, these stray lights will irradiate within the edge of the second reflecting surface S2 after being reflected by the first reflecting surface S1 for the first time, and will still irradiate within the edge of the second reflecting surface S2 after being reflected by the first reflecting surface S1 for the second time. That is, if the extinction sawtooth 3 can satisfy the stray light with a stray light deviation angle of αt that can be repeatedly reflected between the first reflecting surface S1 and the second reflecting surface S2, then for stray light that deviates from the optical axis L by an angle greater than αt, the stray light can also be repeatedly reflected between the first reflecting surface S1 and the second reflecting surface S2. And for Figure 3 For the position shown, the deviation angle of the stray light is greater than or equal to αt, so Figure 3 All stray light at the position shown can be repeatedly refracted between the first reflecting surface S1 and the second reflecting surface S2, thereby achieving the purpose of absorbing the stray light.

[0062] Continue to refer Figure 3 For the first reflection surface S1, if the angle between the first reflection surface S1 and the inner wall of the lens barrel 1 is less than θ1t, the incident angle of the stray light when it first hits the first reflection surface S1 will decrease, and the propagation path of the light after reflection will deflect toward the optical axis L, so that it cannot hit the second reflection surface S2, causing the stray light to escape from the extinction sawtooth 3. On the contrary, if the angle between the first reflection surface S1 and the wall of the lens barrel 1 is greater than θ1t, the incident angle of the stray light when it first hits the first reflection surface S1 will increase, and the propagation path of the light after reflection will deflect toward the inner wall of the lens barrel 1, and the stray light will irradiate the inside of the edge of the second reflection surface S2, thereby achieving the stray light repeatedly reflected between the first reflection surface S1 and the second reflection surface S2, thereby achieving the purpose of absorbing the stray light. Therefore, in order to satisfy the requirement of limiting the stray light from being repeatedly reflected on the first reflection surface S1 and the second reflection surface S2, the angle between the first reflection surface S1 and the inner wall of the lens barrel 1 needs to satisfy θ1t≥90°-αt / 2.

[0063] Continue to refer Figure 3For the second reflection surface S2, if the angle between the second reflection surface S2 and the inner wall of the lens barrel 1 is less than θ2t, the incident angle of the stray light when it first enters the second reflection surface S2 will decrease, thereby causing the propagation path of the stray light after being reflected by the second reflection surface S2 to deflect toward the optical axis L, so that the stray light will be reflected and escape from between the first reflection surface S1 and the second reflection surface S2 after entering the first reflection surface S1 for the second time. On the contrary, if the angle between the second reflection surface S2 and the wall of the lens barrel 1 is greater than θ2t, the incident angle of the stray light when it first enters the second emission surface will increase, and the propagation path of the stray light after being reflected by the second reflection surface S2 will deflect toward the inner wall of the lens barrel 1. The reflected light of the stray light after the second incident on the first reflection surface S1 can still irradiate within the edge of the second reflection surface S2, thereby achieving the stray light light can be repeatedly reflected between the first reflection surface S1 and the second reflection surface S2, thereby achieving the purpose of absorbing stray light. Therefore, in order to limit stray light from being repeatedly reflected on the first reflection surface S1 and the second reflection surface S2 , the angle between the second reflection surface S2 and the inner wall of the lens barrel 1 needs to satisfy θ2t≥90°+αt / 4.

[0064] For all the lenses 2 in the lens, these lenses 2 have their own minimum stray light deviation angles, the smallest of these minimum stray light deviation angles is recorded as αmin, and the largest of these minimum stray light deviation angles is recorded as αmax.

[0065] As an optional implementation, when the matt sawtooth 3 is specifically arranged, the first reflection surfaces S1 of all the matt sawtooth 3 and the second reflection surfaces S2 of all the matt sawtooth 3 may satisfy:

[0066] θ1t≥90°-αmin / 2, θ2t≥90°+αmax / 4.

[0067] The extinction serrations 3 that meet the above conditions, when arranged on the light-emitting side of any lens 2, can limit the stray light from being repeatedly reflected between the first reflection surface S1 and the second reflection surface S2, thereby achieving the purpose of absorbing the stray light. By arranging the extinction serrations 3, the stray light elimination requirements under lenses 2 with different refractive indices can be met, the design process of the extinction serrations 3 can be simplified, and the production efficiency of the lens can be improved.

[0068] As described above, when the extinction serrations 3 are specifically set, the shapes of the extinction serrations 3 corresponding to the same lens 2 are the same; however, since the refractive indices of different lenses 2 are different, the minimum stray light deviation angles of different lenses 2 are also different, so the ranges of θ1t and θ2t that can be calculated may also be different, so the shapes of the extinction serrations 3 corresponding to different lenses 2 may also be different. Figure 1As shown in , the shapes of the matte serrations 3 corresponding to different lenses 2 are different. However, the angles between the first reflection surface S1 and the second reflection surface of the matte serrations 3 corresponding to each lens 2 and the inner wall of the lens barrel 1 satisfy θ1t≥90°-αmin / 2, θ2t≥90°+αmax / 4.

[0069] like Figure 3 The arrangement of the extinction sawtooth 3 shown in the figure can ensure that after the light enters between two adjacent extinction sawtooths 3, it can escape from between the two extinction sawtooths 3 after at least five reflections. Now assume that for the surface material of the extinction sawtooth 3, each time the light irradiates the first reflection surface S1 or the second reflection surface S2 of the extinction sawtooth 3, N% of the light will be reflected, and the remaining (100-N)% of the light will be absorbed by the first reflection surface S1 or the second reflection surface S2. Then, when the light escapes after at least five reflections, the light incident between the two extinction sawtooths 3 can at most retain N% of the initial incident light. 5 .

[0070] As a specific example, the matte sawtooth 3 in the embodiment of the present application is made of optical plastic. Each time the light is irradiated to the optical plastic, about 4% of the light is reflected. Then for the matte sawtooth 3 made of this material, when the stray light irradiated to the space between two adjacent matte sawtooths 3 escapes from the space between the two matte sawtooths 3 after at least 5 reflections, the remaining light intensity is at most 1.024×10 -7 times, at this time the stray light has been completely absorbed and is unlikely to have a significant impact on the lens imaging.

[0071] Of course, in other possible implementations, all the matte saw teeth 3 may be arranged to have the same shape and size. Figure 4 , Figure 4 This is the second schematic diagram of the lens cross section in the embodiment of the present application. Figure 4 As shown, all the extinction teeth 3 have the same size and shape, and as mentioned above, these extinction teeth 3 can make the stray light repeatedly reflected between two adjacent extinction teeth 3. Figure 4 The matte teeth 3 shown are all identical, which facilitates the mass production of the matte teeth 3 , can improve the processing efficiency of the matte teeth 3 , and reduce the processing difficulty of the matte teeth 3 .

[0072] When the matt serrations 3 are specifically arranged on the inner wall of the lens barrel 1 , there may be a variety of arrangement methods.

[0073] As an optional implementation, the matte serrations 3 can be manufactured integrally with the lens barrel 1. Specifically, when manufacturing the lens barrel 1, the mold of the matte serrations 3 can be directly integrated on the mold of the lens barrel 1, and then the lens barrel 1 and the matte serrations 3 can be produced together during subsequent injection molding. Of course, other processing methods can also be used, for example, after the lens barrel 1 is produced, the matte serrations 3 are processed by turning or other processing methods.

[0074] The matt serrations 3 are arranged on the inner wall of the lens barrel 1 by an integrated molding manufacturing method. On the one hand, the lens barrel 1 and the matt serrations 3 have good connection stability, and the integrated molding manufacturing method makes it possible to have no installation gap at the connection between the lens barrel 1 and the matt serrations 3, thereby reducing the risk of light leakage in the lens. On the other hand, the integrated molding manufacturing method can reduce the influence of the installation error between the matt serrations 3 and the lens barrel 1 on the effect of the matt serrations 3 in absorbing stray light.

[0075] As another optional implementation, the matte serrations 3 and the lens barrel 1 can also be manufactured separately and assembled separately to set the matte serrations 3 on the inner wall of the lens barrel 1. Specifically, the lens further includes a matte sleeve, and the matte serrations 3 are set on the inner wall of the matte sleeve. The matte sleeve is fixedly mounted on the inner wall of the lens barrel 1, thereby achieving the setting of the matte serrations 3 inside the lens barrel 1.

[0076] Specifically, when the matte serrations 3 are processed on the inner wall of the matte sleeve, integral injection molding or turning can still be used. When the matte sleeve is fixed to the inner wall of the lens barrel 1, interference fit can be used for assembly, or some connection structures can be used to assist in fixing the matte sleeve.

[0077] By separately providing a matte sleeve to carry the matte serrations 3, the matte serrations 3 and the lens barrel 1 can be produced separately, thereby reducing the difficulty of processing the lens barrel 1 and the matte serrations 3. Furthermore, the lens barrel 1 and the matte serrations 3 are processed separately, which can reduce the loss of defective products in the production process even if the processing yield rate remains unchanged, thereby reducing waste.

[0078] Further optionally, when the matt sleeve is fixedly mounted to the lens barrel 1, a threaded connection method may be adopted. Specifically, the matt sleeve has an external thread, and the lens barrel 1 has an internal thread, and the external thread of the matt sleeve can cooperate with the internal thread of the lens barrel 1 to fix the matt sleeve to the inner wall of the lens barrel 1. Specifically, after the matt sleeve and the lens barrel 1 are manufactured separately, the matt sleeve can be screwed into the lens barrel 1, and at this time, under the action of the thread, the matt sleeve can be placed in the lens barrel 1 and fixed.

[0079] The matting sleeve is inserted and fixed to the inner wall of the lens barrel 1 by means of threaded connection, and the threaded fit can provide good connection stability. The assembly accuracy is easy to control by means of threaded connection, and the operation is relatively simple and convenient during installation.

[0080] The extinction teeth 3 in the above lens are arranged on the light-emitting side of any lens 2. These extinction teeth 3 can absorb stray light on the light-emitting side of the lens 2, thereby reducing the stray light from entering the next lens 2 or reducing the stray light from reaching the photosensitive element. For the first lens 2 located at the object end of the lens, some stray light elimination devices can also be arranged to reduce the stray light from entering the first lens 2.

[0081] Specifically, as an optional implementation, the lens further includes a hood, which is fixed to the object end of the lens, and is used to block at least part of stray light outside the field of view of the lens from entering the lens.

[0082] The embodiment of the present application also provides an augmented reality device, which includes an augmented reality device body, and any of the above-mentioned lenses arranged on the augmented reality device body. Specifically, the augmented reality device can be a head-mounted display, some virtual reality controllers, etc. Any of the above-mentioned lenses can be arranged in the image acquisition module of these augmented reality devices. Specifically, the lens in this embodiment is used to cooperate with the photosensitive element to capture the picture of the real world or the behavior of the user.

[0083] The lenses of these augmented reality devices are designed with extinction teeth on the light-emitting side of each lens element and the shape of the extinction teeth is optimized so that stray light is repeatedly reflected between two adjacent extinction teeth after being irradiated, thereby absorbing the stray light and reducing the impact of the stray light on the imaging quality of the lens.

[0084] One or more embodiments of this specification are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this specification should be included in the scope of protection of this disclosure.

[0085] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A lens, characterized in that: include: Lens barrel, lens and matte saw teeth; wherein: The lens is fixed in the lens barrel, the number of the lens is at least one, and when the number of the lens is greater than one, at least two of the lenses are arranged at intervals along the optical axis of the lens; The extinction serrations are arranged on the light-emitting side of each lens, and at least two extinction serrations are arranged on the light-emitting side of each lens; the at least two extinction serrations are arranged along the optical axis of the lens, and each of the extinction serrations is arranged around the inner wall of the lens barrel; Any two adjacent extinction teeth satisfy the following conditions: after stray light outside the field of view of the lens is irradiated between the two adjacent extinction teeth, the stray light is repeatedly reflected between the two adjacent extinction teeth; When the stray light passes through any lens of the lens, the minimum angle at which the stray light deviates from the optical axis of the lens is the minimum stray light deviation angle of the lens; The sawtooth surface of any extinction sawtooth facing the light input side of the lens is a first reflection surface, and the sawtooth surface of any extinction sawtooth facing the light output side of the lens is a second reflection surface; The minimum stray light deviation angle of any of the lenses is αt; for any of the extinction sawtooths corresponding to the lens, the angle between the first reflection surface of the extinction sawtooth and the inner wall of the lens barrel close to the imaging end is θ1t, and the angle between the second reflection surface of the extinction sawtooth and the inner wall of the lens barrel close to the object end is θ2t; θ1t, θ2t and αt satisfy: θ1t≥90°-αt / 2, θ2t≥90°+αt / 4.

2. The lens according to claim 1, characterized in that: The smallest minimum stray light deviation angle among all lenses of the lens is αmin, and the largest minimum stray light deviation angle among all lenses of the lens is αmax; The first reflection surface of all extinction saw teeth and the second reflection surface of all extinction saw teeth satisfy: θ1t≥90°-αmin / 2, θ2t≥90°+αmax / 4.

3. The lens according to claim 2, characterized in that: The matte saw teeth have the same shape and size.

4. The lens according to claim 1, characterized in that: The lens also includes a light shield, which is fixed to the object end of the lens; The light shield is used to block at least part of stray light outside the field of view of the lens from entering the lens.

5. The lens according to claim 1, characterized in that: The matte sawtooth is a sharp-angle sawtooth.

6. The lens according to any one of claims 1 to 5, characterized in that: The matte sawtooth is integrally formed with the lens barrel.

7. The lens according to any one of claims 1 to 5, characterized in that: The lens further comprises a matte sleeve, and the matte serrations are located on the inner wall of the matte sleeve; The matting sleeve is sleeved and fixed on the inner wall of the lens barrel.

8. The lens according to claim 7, characterized in that: The matting sleeve has an external thread, and the lens barrel has an internal thread; The external thread cooperates with the internal thread to fix the matting sleeve on the inner wall of the lens barrel.

9. An augmented reality device, characterized in that: It comprises an augmented reality device body, and a lens as claimed in any one of claims 1 to 8 arranged on the augmented reality device body.

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