Turn-back prism assembly and optical lens

Abstract

The utility model provides a turn-back prism assembly and an optical lens. The turn-back prism assembly comprises a first prism, the first prism is provided with a first mirror surface, a second mirror surface, a first binding surface and a first side surface, the first binding surface is connected between the first mirror surface and the second mirror surface and is perpendicular to the first mirror surface, and the joint of the first side surface and the second mirror surface is a first connecting edge; the second prism is provided with a third mirror surface, a fourth mirror surface, a second binding surface and a second side surface, the second binding surface is connected between the third mirror surface and the fourth mirror surface and is perpendicular to the third mirror surface, and a second connecting edge is arranged at the joint of the second side surface and the fourth mirror surface; wherein the first prism and the second prism are connected through the first binding face and the second binding face, the first connecting edge and the second connecting edge are located in the auxiliary face, an included angle alpha is formed between the second mirror face and the auxiliary face, and an included angle beta is formed between the fourth mirror face and the auxiliary face. According to the utility model, the problem of serious stray light existing in the turn-back prism assembly in the prior art is solved.

Description

Technical Field

[0001] This utility model relates to the field of optical imaging equipment technology, and more specifically, to a folding prism assembly and an optical lens. Background Technology

[0002] With the increasing demand for camera functions in mobile devices such as smartphones and tablets, especially the pursuit of high-definition and telephoto capabilities, telephoto lenses have become an indispensable component. However, due to their long effective focal length, telephoto lenses often struggle to meet the miniaturization requirements of portable devices. Therefore, introducing a retroreflective prism has become a common solution. Through multiple refractions and reflections in the light path, the overall size of the lens can be significantly reduced while maintaining a long focal length, making it more suitable for integration into space-constrained mobile devices.

[0003] The basic principle of a retroreflective prism is to utilize the refraction and reflection properties of light to compress the light path by changing the direction of light multiple times. While this design can effectively reduce the size of telephoto lenses, in practical applications, light needs to undergo multiple reflections before finally reaching the lens's receiving end. Each reflection may produce stray light rays that deviate from the optical axis due to minute unevenness or contamination on the prism surface.

[0004] In other words, existing folding prism components suffer from severe stray light problems. Utility Model Content

[0005] The main objective of this invention is to provide a folding prism assembly and an optical lens to solve the problem of severe stray light in existing folding prism assemblies.

[0006] To achieve the above objectives, according to one aspect of the present invention, a folding prism assembly is provided, comprising: a first prism having a first mirror surface, a second mirror surface, a first bonding surface, and a first side surface; the first bonding surface being connected between the first mirror surface and the second mirror surface and perpendicular to the first mirror surface; and the connection point between the first side surface and the second mirror surface being a first connecting edge; and a second prism having a third mirror surface, a fourth mirror surface, a second bonding surface, and a second side surface; the second bonding surface being connected between the third mirror surface and the fourth mirror surface and perpendicular to the third mirror surface; and the connection point between the second side surface and the fourth mirror surface being a second connecting edge; wherein the first prism and the second prism are connected through the first bonding surface and the second bonding surface; the first mirror surface and the third mirror surface are coplanar; the first connecting edge and the second connecting edge are located within an auxiliary surface; the auxiliary surface is parallel to the first mirror surface and the third mirror surface; there is an angle α between the second mirror surface and the auxiliary surface; and there is an angle β between the fourth mirror surface and the auxiliary surface.

[0007] Further, the folding prism assembly satisfies at least one of the following: the included angle α between the second mirror surface and the auxiliary surface is greater than 1° and less than 5°; the included angle β between the fourth mirror surface and the auxiliary surface is greater than 1° and less than 5°.

[0008] Further, the first prism further includes a first connecting surface connected between the first mirror surface and the first side surface; the second prism further includes a second connecting surface connected between the third mirror surface and the second side surface.

[0009] Further, the included angle γ between the plane where the first side surface is located and the plane where the first mirror surface is located, and the included angle α between the second mirror surface and the auxiliary surface satisfy: 0 < α / γ < 0.333; the included angle δ between the plane where the second side surface is located and the plane where the third mirror surface is located, and the included angle β between the fourth mirror surface and the auxiliary surface satisfy: 0 < β / δ < 0.333.

[0010] Further, the first bonding surface includes a first light-transmitting area and a first silk-screen printing area, the first light-transmitting area is connected to the first mirror surface, and the first silk-screen printing area surrounds the first light-transmitting area; the second bonding surface includes a second light-transmitting area and a second silk-screen printing area, the second light-transmitting area is connected to the third mirror surface, and the second silk-screen printing area surrounds the second light-transmitting area.

[0011] Further, the first light-transmitting area is rectangular, one side of the first light-transmitting area is connected to the first mirror surface, and the first silk-screen printing area surrounds the remaining three sides of the first light-transmitting area; the second light-transmitting area is rectangular, one side of the second light-transmitting area is connected to the third mirror surface, and the second silk-screen printing area surrounds the remaining three sides of the second light-transmitting area.

[0012] Further, the folding prism assembly satisfies at least one of the following: the length d1 of the first light-transmitting area and the length c1 of the first silk-screen printing area satisfy: 0.4 < d1 / c1 < 0.6; the width b1 of the first light-transmitting area and the width a1 of the first silk-screen printing area satisfy: 0.5 < b1 / a1 < 0.67.

[0013] Further, the folding prism assembly satisfies at least one of the following: the length d2 of the second light-transmitting area and the length c2 of the second silk-screen printing area satisfy: 0.4 < d2 / c2 < 0.6; the width b2 of the second light-transmitting area and the width a2 of the second silk-screen printing area satisfy: 0.5 < b2 / a2 < 0.67.

[0014] Further, the first connecting surface is parallel to the first bonding surface; the second connecting surface is parallel to the second bonding surface.

[0015] According to another aspect of the present invention, an optical lens is provided, including the above-mentioned folding prism assembly.

[0016] Applying the technical solution of this utility model, the folding prism assembly includes a first prism and a second prism. The first prism has a first mirror surface, a second mirror surface, a first bonding surface, and a first side surface. The first bonding surface is connected between the first mirror surface and the second mirror surface and is perpendicular to the first mirror surface. The connection between the first side surface and the second mirror surface is a first connecting edge. The second prism has a third mirror surface, a fourth mirror surface, a second bonding surface, and a second side surface. The second bonding surface is connected between the third mirror surface and the fourth mirror surface and is perpendicular to the third mirror surface. The connection between the second side surface and the fourth mirror surface is a second connecting edge. The first prism and the second prism are connected through the first bonding surface and the second bonding surface. The first mirror surface and the third mirror surface are coplanar. The first connecting edge and the second connecting edge are located in an auxiliary surface. The auxiliary surface is parallel to the first mirror surface and the third mirror surface. There is an angle α between the second mirror surface and the auxiliary surface, and there is an angle β between the fourth mirror surface and the auxiliary surface.

[0017] The first and second prisms are connected by a first and second mating surface. The imaging light rays from the lens group of the optical lens enter the first prism through the first mirror and are reflected back within it. The imaging light rays sequentially pass through the first and second mating surfaces, enter the second prism, are reflected back within it, and exit through the third mirror to the imaging plane. During the reflection process within the prism assembly, the imaging light rays do not pass through the second and fourth mirrors. An angle α exists between the second mirror and the auxiliary surface, causing the distance between the first and second mirrors to gradually increase away from the first mating surface. This tilts the second mirror relative to the plane containing the first mirror, which facilitates the transmission of stray light to areas outside the imaging plane. Similarly, an angle β exists between the fourth mirror and the auxiliary surface, causing the distance between the third and fourth mirrors to gradually increase away from the second mating surface. This tilts the fourth mirror relative to the plane containing the third mirror, which also facilitates the transmission of stray light to areas outside the imaging plane and reduces stray light on the imaging plane. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0019] Figure 1 A schematic diagram of the structure of an optical lens according to an optional embodiment of the present invention is shown;

[0020] Figure 2A and Figure 2B They are shown respectively Figure 1 A planar structural diagram of a central prism assembly at one angle and a three-dimensional structural diagram of a central prism assembly at one angle;

[0021] Figure 3A and Figure 3BThey are shown respectively Figure 1 A schematic diagram of the structure of the first bonding surface and a schematic diagram of the structure of the second bonding surface;

[0022] Figure 4 A schematic diagram of the folding prism assembly of Embodiment 1 of this utility model at one angle is shown;

[0023] Figure 5 A schematic diagram of the folding prism assembly of Embodiment 2 of this utility model at one angle is shown;

[0024] Figure 6 A schematic diagram of the folding prism assembly of Embodiment 3 of this utility model at one angle is shown;

[0025] Figure 7 The diagram shows the light spot pattern in the H direction of a folding prism assembly according to an optional embodiment of the present invention;

[0026] Figure 8 The diagram shows the light spot pattern in the V direction of a folding prism assembly according to an optional embodiment of the present invention;

[0027] Figure 9 The following is a light spot pattern in the H direction of an example of the folding prism assembly of this invention;

[0028] Figure 10 The image shows a spot pattern in the V direction of an example of the reflective prism assembly of this invention.

[0029] The above figures include the following reference numerals:

[0030] 60. Auxiliary surface; 70. First prism; 71. First mirror; 72. Second mirror; 73. First bonding surface; 731. First light-transmitting area; 732. First silkscreen area; 74. First side surface; 75. First connecting surface; 76. First connecting edge; 80. Second prism; 81. Third mirror; 82. Fourth mirror; 83. Second bonding surface; 831. Second light-transmitting area; 832. Second silkscreen area; 84. Second side surface; 85. Second connecting surface; 86. Second connecting edge. Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0033] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0034] To address the problem of severe stray light in existing folding prism assemblies, this invention provides a folding prism assembly and an optical lens.

[0035] like Figures 1 to 10 As shown, the reflecting prism assembly includes a first prism 70 and a second prism 80. The first prism has a first mirror surface 71, a second mirror surface 72, a first mating surface 73, and a first side surface 74. The first mating surface 73 is connected between the first mirror surface 71 and the second mirror surface 72 and is perpendicular to the first mirror surface 71. The connection point between the first side surface 74 and the second mirror surface 72 is a first connecting ridge 76. The second prism 80 has a third mirror surface 81, a fourth mirror surface 82, a second mating surface 83, and a second side surface 84. The second mating surface 83 is connected between the third mirror surface 81 and the fourth mirror surface 72. The second side surface 84 is between the surfaces 82 and perpendicular to the third mirror surface 81. The connection point between the second side surface 84 and the fourth mirror surface 82 is the second connecting edge 86. The first prism 70 and the second prism 80 are connected by the first mating surface 73 and the second mating surface 83. The first mirror surface 71 and the third mirror surface 81 are coplanar. The first connecting edge 76 and the second connecting edge 86 are located in the auxiliary surface 60. The auxiliary surface 60 is parallel to the first mirror surface 71 and the third mirror surface 81. There is an angle α between the second mirror surface 72 and the auxiliary surface 60, and there is an angle β between the fourth mirror surface 82 and the auxiliary surface 60.

[0036] The first prism 70 and the second prism 80 are bonded together via the first mating surface 73 and the second mating surface 83. The imaging light rays from the lens group of the optical lens enter the first prism 70 through the first mirror surface 71 and are reflected within it. The imaging light rays sequentially pass through the first mating surface 73 and the second mating surface 83 into the second prism 80, are reflected within it, and exit through the third mirror surface 81 onto the imaging surface. During the reflection process within the reflecting prism group, the imaging light rays do not pass through the second mirror surface 72 and the fourth mirror surface 82. The second mirror surface 72 and the auxiliary surface 60 have an angle α, causing the distance between the first mirror surface 71 and the second mirror surface 72 to gradually increase away from the first mating surface 73. This makes the second mirror surface 72 tilted relative to the plane containing the first mirror surface 71, which is beneficial for stray light transmission to areas outside the imaging surface. Similarly, the angle β between the fourth mirror 82 and the auxiliary surface 60 causes the distance between the third mirror 81 and the fourth mirror 82 to gradually increase in the direction away from the second mating surface 83, making the fourth mirror 82 tilted relative to the plane where the third mirror 81 is located. This is beneficial for stray light to be transmitted to areas outside the imaging surface and reduces stray light on the imaging surface.

[0037] Furthermore, when the second mirror 72 is tilted relative to the first mirror 71, some stray light, upon incident on the second mirror 72, can be transmitted through the second mirror 72 and leave the first prism 70. This prevents the stray light from being repeatedly reflected within the prism assembly and from incident on the imaging surface, effectively reducing the amount of stray light entering the imaging surface. Similarly, when the fourth mirror 82 is tilted relative to the third mirror 81, some stray light, upon incident on the fourth mirror 82, can be transmitted through the fourth mirror 82 and leave the second prism 80. This prevents the stray light from being repeatedly reflected within the prism assembly and from incident on the imaging surface, effectively reducing the amount of stray light entering the imaging surface.

[0038] It should be noted that if the second mirror 72 and the first mirror 71 are set as parallel structures, stray light will be repeatedly reflected and incident on the imaging surface within the prism assembly, forming stray light. However, in this application, the second mirror 72 is tilted relative to the plane containing the first mirror 71, which changes the exit angle of the stray light passing through the second mirror 72, thereby altering the subsequent transmission path of the stray light and allowing it to be transmitted to an area outside the imaging surface. Similarly, if the fourth mirror 82 and the third mirror 81 are set as parallel structures, stray light will be repeatedly reflected and incident on the imaging surface within the prism assembly, forming stray light. However, in this application, the fourth mirror 82 is tilted relative to the plane containing the third mirror 81, which changes the exit angle of the stray light passing through the second mirror 72, thereby altering the subsequent transmission path of the stray light and allowing it to be transmitted to an area outside the imaging surface.

[0039] like Figure 1 , Figure 2A , Figure 2B , Figures 4 to 6 As shown, the first mirror 71 and the third mirror 81 are coplanar, which is beneficial for controlling the size of the reflecting prism assembly and for miniaturizing the reflecting prism assembly. At the same time, it is also beneficial for controlling the tilt angle of the second mirror 72 and the fourth mirror 82, so that the tilt angles of the second mirror 72 and the fourth mirror 82 are the same or similar. That is to say, the first mirror 71 and the third mirror 81 are located on the same plane.

[0040] like Figure 1 , Figures 4 to 6 As shown, the first side surface 74 is connected to the side of the second mirror surface 72 opposite to the first bonding surface 73 and extends in the direction opposite to the first bonding surface 73. The distance from the first side surface 74 to the first mirror surface 71 gradually decreases in the direction opposite to the first bonding surface 73. This arrangement is beneficial for the first side surface 74 to reflect the imaging light to the first mirror surface 71 and the third mirror surface 81. The first side surface 74 and the first mirror surface 71 can be connected or spaced apart.

[0041] like Figure 1 , Figures 4 to 6 As shown, the second side surface 84 is connected to the side of the fourth mirror surface 82 opposite to the second mating surface 83 and extends in the direction opposite to the second mating surface 83. The distance from the second side surface 84 to the third mirror surface 81 gradually decreases in the direction opposite to the second mating surface 83. This arrangement is beneficial for the second side surface 84 to reflect the imaging light to the third mirror surface 81 for emission. The second side surface 84 and the third mirror surface 81 can be connected or spaced apart.

[0042] In a specific embodiment not shown, the side of the first side 74 away from the second mirror 72 is connected to the first mirror 71.

[0043] In another specific embodiment not shown, the side of the second side 84 away from the fourth mirror 82 is connected to the third mirror 81.

[0044] like Figure 1 , Figures 4 to 6 As shown, when the first side surface 74, away from the second mirror surface 72, is spaced apart from the first mirror surface 71, the first prism 70 also includes a first connecting surface 75, which connects to the first side surface 74 and the first mirror surface 71. The first side surface 74 can be understood as the surface formed by cutting off the corner after the first mirror surface 71 and the second mirror surface 72 are connected. This arrangement can reduce the size of the folding prism assembly, which is beneficial for the miniaturization of optical lenses.

[0045] Optionally, the first connecting surface 75 is parallel to the first mating surface 73. Setting the first connecting surface 75 and the first mating surface 73 to be parallel facilitates the fabrication of the first prism 70.

[0046] like Figure 1 , Figures 4 to 6 As shown, when the second side surface 84, away from the fourth mirror surface 82, is spaced apart from the third mirror surface 81, the second prism 80 also includes a second connecting surface 85, which connects to the second side surface 84 and the third mirror surface 81. The second side surface 84 can be understood as the surface formed by cutting off the corner after the third mirror surface 81 and the fourth mirror surface 82 are connected. This arrangement can reduce the size of the folding prism assembly, which is beneficial for the miniaturization of optical lenses.

[0047] Optionally, the second connecting surface 85 is parallel to the second mating surface 83. Setting the second connecting surface 85 and the second mating surface 83 to be parallel facilitates the fabrication of the second prism 80.

[0048] like Figures 4 to 6 As shown, the angle α between the second mirror 72 and the auxiliary surface 60 is greater than 1° and less than 5°. Depending on the actual application, the angle between the second mirror 72 and the auxiliary surface 60 can be set within the range of 1° to 5°. Of course, the size of the angle between the second mirror 72 and the auxiliary surface 60 can also be changed according to the actual needs of the optical lens, as long as the purpose is to reduce stray light falling onto the imaging surface. Naturally, the size of the angle between the second mirror 72 and the auxiliary surface 60 is also related to the lens group and can be designed according to the specific needs of the optical lens.

[0049] Furthermore, by setting the angle α between the second mirror 72 and the auxiliary surface 60 within the range of 1° to 5°, the stray light path after reflection can be absorbed in the first silkscreen area 732 and the second silkscreen area 832 behind, thereby improving the stray light effect of the folding prism assembly.

[0050] like Figures 4 to 6 As shown, the angle β between the fourth mirror surface 82 and the auxiliary surface 60 is greater than 1° and less than 5°. The angle between the fourth mirror surface 82 and the auxiliary surface 60 can be set within the range of 1° to 5° depending on the actual application. Of course, the size of the angle between the fourth mirror surface 82 and the auxiliary surface 60 can also be changed according to the actual needs of the optical lens, as long as the purpose is to reduce stray light falling onto the imaging plane. Naturally, the size of the angle between the fourth mirror surface 82 and the auxiliary surface 60 is also related to the lens group and can be designed according to the specific needs of the optical lens.

[0051] like Figures 4 to 6As shown, the angle γ between the plane containing the first side surface 74 and the plane containing the first mirror 71, and the angle α between the second mirror 72 and the auxiliary surface 60, satisfy the condition: 0 < α / γ < 0.333. By controlling the relationship between the angle γ between the plane containing the first side surface 74 and the plane containing the first mirror 71, and the angle α between the second mirror 72 and the auxiliary surface 60, the exit angle of stray light when passing through the second mirror 72 can be changed, thereby changing the transmission path of the stray light. This results in the stray light having a different transmission angle from the imaging light during its reflection within the prism assembly, thus reducing stray light falling onto the imaging surface and reducing the generation of stray light spots.

[0052] It should be noted that the exit angle of stray light when it passes through the second mirror 72 specifically refers to the angle at which it exits from the second mirror 72, which may include the transmission angle of the stray light by the second mirror 72 and the reflection angle of the stray light by the second mirror 72.

[0053] It should be noted that the imaging light rays enter the first prism 70 through the first mirror 71 and then onto the first side surface 74, whereby the first side surface 74 reflects the imaging light rays back onto the first mirror 71. Therefore, when the angle between the first side surface 74 and the first mirror 71 changes, the angle between the second mirror 72 and the auxiliary surface 60 needs to be adjusted accordingly to control the exit angle of stray light from the second mirror 72, ensuring that the stray light and the imaging light rays have different transmission angles, thereby reducing the amount of stray light falling onto the imaging surface.

[0054] like Figures 4 to 6 As shown, the angle δ between the plane containing the second side surface 84 and the plane containing the third mirror 81, and the angle β between the fourth mirror 82 and the auxiliary surface 60, satisfy the condition: 0 < β / δ < 0.333. By controlling the relationship between the angle δ between the plane containing the second side surface 84 and the plane containing the third mirror 81, and the angle β between the fourth mirror 82 and the auxiliary surface 60, the exit angle of stray light when passing through the fourth mirror 82 can be changed, thereby changing the transmission path of the stray light and causing it to fall outside the image plane, thus avoiding the generation of stray light spots.

[0055] It should be noted that the imaging light is reflected to the second side surface 84, which then reflects the imaging light to the third mirror surface 81, from which the imaging light exits. Therefore, when the angle between the second side surface 84 and the third mirror surface 81 changes, the angle β between the fourth mirror surface 82 and the auxiliary surface 60 needs to be adjusted accordingly to ensure that stray light falls outside the imaging surface.

[0056] like Figure 3A and Figure 3BAs shown, the first bonding surface 73 includes a first light-transmitting area 731 and a first silkscreen area 732. The first light-transmitting area 731 is connected to the first mirror surface 71, and the first silkscreen area 732 surrounds the first light-transmitting area 731. The second bonding surface 83 includes a second light-transmitting area 831 and a second silkscreen area 832. The second light-transmitting area 831 is connected to the third mirror surface 81, and the second silkscreen area 832 surrounds the second light-transmitting area 831. Through the reasonable arrangement of the first silkscreen area 732 and the second silkscreen area 832, stray light generated within the prism assembly is effectively absorbed and reduced, while maintaining the optical transparency of the first light-transmitting area 731 and the second light-transmitting area 831, ensuring that the imaging light can be transmitted without loss. This arrangement can significantly improve the clarity and purity of the image and reduce image blurring and noise caused by stray light. The design of the first silkscreen area 732 surrounding the first light-transmitting area 731 and the second silkscreen area 832 surrounding the second light-transmitting area 831 effectively absorbs and reduces light rays on non-light-transmitting paths, i.e., stray light. When imaging light undergoes multiple reflections through the folding prism assembly, some light inevitably deviates from the main optical path, forming stray light. If this stray light is not processed, it will form spots or halos in the image, reducing image sharpness and contrast. By coating the first silkscreen area 732 and the second silkscreen area 832 with light-absorbing material, this stray light is effectively eliminated before reaching the image sensor, thereby significantly improving image quality.

[0057] Furthermore, dividing the first bonding surface 73 and the second bonding surface 83 into a light-transmitting area and a screen-printing area increases design flexibility. The size and shape of the light-transmitting area, as well as the density and coverage of the screen-printing area, can be adjusted according to different needs to optimize optical performance while also considering mechanical strength and heat dissipation requirements. The screen-printing area, compared to complex processing on the optically effective surface, such as grooving or engraving, can significantly reduce manufacturing costs and process complexity. The screen-printing process is relatively simple, easy to mass-produce, and has relatively low material requirements, helping to control production costs and improve manufacturing efficiency.

[0058] However, optical materials may undergo slight deformation when the temperature changes, affecting the accuracy of the optical path. The presence of the screen-printed area can reduce stress concentration caused by temperature changes and help to uniformly distribute the thermal expansion effect. As a result, the folding prism assembly can maintain good thermal stability under different ambient temperatures, ensuring consistent optical performance.

[0059] The light-transmitting area includes the first light-transmitting area 731 and the second light-transmitting area 831 mentioned above, and the screen-printing area includes the first screen-printing area 732 and the second screen-printing area 832 mentioned above.

[0060] like Figure 3AAs shown, the first light-transmitting area 731 is rectangular, one side of the first light-transmitting area 731 is connected to the first mirror surface 71, and the first silk-screening area 732 surrounds the remaining three sides of the first light-transmitting area 731. The first silk-screening area 732 is arranged to surround the other three sides of the first light-transmitting area 731, so that the first silk-screening area 732 can absorb stray light from multiple directions, and at the same time ensure that the imaging light passes through the first light-transmitting area 731 smoothly, so as to ensure the image brightness of the optical lens while reducing stray light.

[0061] As Figure 3B shown, the second light-transmitting area 831 is rectangular, one side of the second light-transmitting area 831 is connected to the third mirror surface 81, and the second silk-screening area 832 surrounds the remaining three sides of the second light-transmitting area 831. The second silk-screening area 832 is arranged to surround the other three sides of the second light-transmitting area 831, so that the second silk-screening area 832 can absorb stray light from multiple directions, and at the same time ensure that the imaging light passes through the second light-transmitting area 831 smoothly, so as to ensure the image brightness of the optical lens while reducing stray light.

[0062] As Figure 3A and Figure 3B shown, the length d1 of the first light-transmitting area 731 and the length c1 of the first silk-screening area 732 satisfy: 0.4 < d1 / c1 < 0.6; the length d2 of the second light-transmitting area 831 and the length c2 of the second silk-screening area 832 satisfy: 0.4 < d2 / c2 < 0.6. By constraining d1 / c1 and d2 / c2 within the above range, the stray light optical path generated in the H direction can be intercepted, thereby improving the stray light effect in the H direction. At the same time, the settings of the first silk-screening area 732 and the second silk-screening area 832 can also improve the structural strength of the first prism 70 and the second prism 80.

[0063] Please refer to Figure 7 and Figure 9 , where Figure 7 is the stray light spot diagram in the H direction of the folding prism assembly of an optional embodiment of the present application, Figure 9 is the stray light spot diagram in the H direction of the folding prism assembly when d1 / c1 and d2 / c2 are not within the above range, Figure 7 there is no stray light, and the ratio of the stray light energy to the total energy of the light source is 0. Figure 9 there are obvious stray light spots, and the ratio of the stray light energy to the total energy of the light source is 2.424*E-5. Comparing Figure 7 and Figure 9It can be seen that in this application, by limiting the ratio of the length d1 of the first light-transmitting region 731 to the length c1 of the first screen-printing region 732 within the range of 0.4 to 0.6 and limiting the ratio of the length d2 of the second light-transmitting region 831 to the length c2 of the second screen-printing region 832 within the range of 0.4 to 0.6, the stray light spot in the H direction can be improved.

[0064] It should be noted that the length d1 of the first light-transmitting region 731, the length c1 of the first screen-printing region 732, the length d2 of the second light-transmitting region 831, and the length c2 of the second screen-printing region 832 can be adjusted according to the specific optical system.

[0065] As Figure 3A and Figure 3B shown, the following relationship is satisfied between the width b1 of the first light-transmitting region 731 and the width a1 of the first screen-printing region 732: 0.5 < b1 / a1 < 0.67; the following relationship is satisfied between the width b2 of the second light-transmitting region 831 and the width a2 of the second screen-printing region 832: 0.5 < b2 / a2 < 0.67. By restricting b1 / a1 and b2 / a2 within the above ranges, the stray light optical path generated in the V direction can be intercepted, thereby improving the stray light effect in the V direction. At the same time, the settings of the first screen-printing region 732 and the second screen-printing region 832 can also improve the structural strength of the first prism 70 and the second prism 80.

[0066] Please refer to Figure 8 and Figure 10 , where Figure 8 is the stray light spot diagram in the V direction of the folding prism assembly of an optional embodiment of this application, Figure 10 is the stray light spot diagram in the V direction of the folding prism assembly when b1 / a1 and b2 / a2 are not within the above ranges, Figure 8 has no stray light, and the ratio of the stray light energy to the total energy of the light source is 0. Figure 10 has obvious stray light spots, and the ratio of the stray light energy to the total energy of the light source is 3.562*E-4. Comparing Figure 8 and Figure 10 it can be seen that in this application, by limiting the ratios of both b1 / a1 and b2 / a2 within the range of 0.5 to 0.67, the stray light spot in the V direction can be improved.

[0067] It should be noted that the width b1 of the first light-transmitting region 731, the width a1 of the first screen-printing region 732, the width b2 of the second light-transmitting region 831, and the width a2 of the second screen-printing region 832 can be adjusted according to the specific optical system.

[0068] The optical lens includes the above-mentioned folding prism assembly. The optical lens with the above-mentioned folding prism assembly has the advantages of miniaturization, long focal length, and clear imaging.

[0069] This application also provides three specific embodiments, please refer to them. Figures 4 to 6 Since the structures in Embodiments 1 to 3 are similar to those described above, they will not be repeated here. The main difference lies in the parameters of the folding prism assembly. For the parameters of Embodiments 1 to 3, please refer to Table 1.

[0070] Table 1

[0071] Example / Parameters a1 b1 c1 d1 a2 b2 c2 d2 α° β° γ° δ° Example 1 4.23 2.45 10 5.78 4.26 2.45 10 5.78 3 3 34 34 Example 2 4.16 2.35 11 5.18 4.33 2.35 11 5.18 4 2 34 34 Example 3 4.32 2.25 9 4.18 4.26 2.25 9 4.18 2 3 34 34

[0072] In Embodiment 1, the width a1 of the first silkscreen area 732 is slightly smaller than the width a2 of the second silkscreen area 832. The joint between the second mirror 72 and the fourth mirror 82 has a height difference. The included angle α between the second mirror 72 and the auxiliary surface and the included angle β between the fourth mirror 82 and the auxiliary surface are the same.

[0073] In the second embodiment, the width a1 of the first silkscreen area 732 is slightly smaller than the width a2 of the second silkscreen area 832. There is a height difference at the splicing point of the second mirror 72 and the fourth mirror 82. The included angle α between the second mirror 72 and the auxiliary surface and the included angle β between the fourth mirror 82 and the auxiliary surface are different, with included angle α being greater than included angle β.

[0074] In Embodiment 3, the width a1 of the first silkscreen area 732 is slightly larger than the width a2 of the second silkscreen area 832. There is a height difference at the splicing point of the second mirror 72 and the fourth mirror 82. The included angle α between the second mirror 72 and the auxiliary surface and the included angle β between the fourth mirror 82 and the auxiliary surface are different, with included angle β being greater than included angle α.

[0075] In other words, the width a1 of the first silkscreen area 732 can be greater than or less than the width a2 of the second silkscreen area 832, or the width a1 of the first silkscreen area 732 can be equal to the width a2 of the second silkscreen area 832. The included angle α and included angle β can be the same, or included angle α can be greater than included angle β, or included angle α can be less than included angle β.

[0076] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0077] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0078] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0079] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A folding prism assembly, characterized in that, The folding prism assembly includes: A first prism (70) has a first mirror surface (71), a second mirror surface (72), a first mating surface (73), and a first side surface (74). The first mating surface (73) is connected between the first mirror surface (71) and the second mirror surface (72) and is perpendicular to the first mirror surface (71). The connection point between the first side surface (74) and the second mirror surface (72) is a first connecting ridge (76). The second prism (80) has a third mirror surface (81), a fourth mirror surface (82), a second mating surface (83), and a second side surface (84). The second mating surface (83) is connected between the third mirror surface (81) and the fourth mirror surface (82) and is perpendicular to the third mirror surface (81). The connection between the second side surface (84) and the fourth mirror surface (82) is a second connecting ridge (86). The first prism (70) and the second prism (80) are connected by the first mating surface (73) and the second mating surface (83). The first mirror surface (71) and the third mirror surface (81) are coplanar. The first connecting edge (76) and the second connecting edge (86) are located in the auxiliary surface (60). The auxiliary surface (60) is parallel to the first mirror surface (71) and the third mirror surface (81). The second mirror surface (72) and the auxiliary surface (60) have an angle α between them. The fourth mirror surface (82) and the auxiliary surface (60) have an angle β between them.

2. The folding prism assembly according to claim 1, characterized in that, The folding prism assembly satisfies at least one of the following: The angle α between the second mirror (72) and the auxiliary surface (60) is greater than 1° and less than 5°; The angle β between the fourth mirror (82) and the auxiliary surface (60) is greater than 1° and less than 5°.

3. The folding prism assembly according to claim 1, characterized in that, The first prism (70) further includes a first connecting surface (75), which is connected between the first mirror surface (71) and the first side surface (74); The second prism (80) also includes a second connecting surface (85), which is connected between the third mirror (81) and the second side surface (84).

4. The folding prism assembly according to claim 1 or 3, characterized in that, The angle γ between the plane containing the first side surface (74) and the plane containing the first mirror (71), and the angle α between the second mirror (72) and the auxiliary surface (60) satisfy the following: 0 < α / γ < 0.333; The angle δ between the plane containing the second side surface (84) and the plane containing the third mirror surface (81), and the angle β between the fourth mirror surface (82) and the auxiliary surface (60) satisfy the following condition: 0 < β / δ < 0.

333.

5. The folding prism assembly according to claim 1, characterized in that, The first bonding surface (73) includes a first light-transmitting area (731) and a first screen-printed area (732). The first light-transmitting area (731) is connected to the first mirror surface (71), and the first screen-printed area (732) surrounds the first light-transmitting area (731). The second bonding surface (83) includes a second light-transmitting area (831) and a second screen-printed area (832). The second light-transmitting area (831) is connected to the third mirror surface (81), and the second screen-printed area (832) surrounds the second light-transmitting area (831).

6. The folding prism assembly according to claim 5, characterized in that, The first light-transmitting area (731) is rectangular, one side of the first light-transmitting area (731) is connected to the first mirror (71), and the first silkscreen area (732) surrounds the remaining three sides of the first light-transmitting area (731). The second light-transmitting area (831) is rectangular, one side of the second light-transmitting area (831) is connected to the third mirror (81), and the second silkscreen area (832) surrounds the remaining three sides of the second light-transmitting area (831).

7. The folding prism assembly according to claim 6, characterized in that, The folding prism assembly satisfies at least one of the following: The length d1 of the first light-transmitting area (731) and the length c1 of the first silkscreen area (732) satisfy the following relationship: 0.4 <d1 / c1<0.6; The width b1 of the first light-transmitting area (731) and the width a1 of the first silkscreen area (732) satisfy the following relationship: 0.5 <b1 / a1<0.67。 8. The folding prism assembly according to claim 6, characterized in that, The folding prism assembly satisfies at least one of the following: The length d2 of the second light-transmitting area (831) and the length c2 of the second silkscreen area (832) satisfy the following relationship: 0.4 <d2 / c2<0.6; The width b2 of the second light-transmitting area (831) and the width a2 of the second silkscreen area (832) satisfy the following relationship: 0.5 <b2 / a2<0.67。 9. The folding prism assembly according to claim 3, characterized in that, The first connecting surface (75) is parallel to the first mating surface (73), and the second connecting surface (85) is parallel to the second mating surface (83).

10. An optical lens, characterized in that, Includes the folding prism assembly as described in any one of claims 1 to 9.

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