A light-reversing element for a telephoto optical system and its manufacturing process

Abstract

This application discloses an optical reversing element for use in a telephoto optical system and its manufacturing process, comprising: providing at least two prisms, the at least two prisms having a first bonding surface and a second bonding surface for bonding with each other; providing at least one light-shielding film, the at least one light-shielding film being disposed on the first bonding surface or the second bonding surface; calibrating the relative positions of the at least two prisms; disposing an adhesive medium between the first bonding surface and the second bonding surface of the at least two prisms; and curing the adhesive medium to hold the at least two prisms in the calibrated relative positions to form an optical reversing element.

Description

Technical Field

[0001] This application relates to the field of camera module technology, and in particular to a light-converting element used in a telephoto optical system and its manufacturing process. Background Technology

[0002] In recent years, with the widespread use of portable electronic devices such as smartphones and smartwatches, the camera performance of these devices has received increasing market attention. To meet the market demand for telephoto and super-telephoto camera performance, telephoto lenses have emerged. However, the thickness of the prism in a telephoto lens greatly affects the overall thickness of the lens. Therefore, how to meet the performance requirements of a telephoto lens while using a relatively thin prism is a technical problem that urgently needs to be solved. Summary of the Invention

[0003] One objective of this application is to provide an optical conversion element for use in a telephoto optical system and its manufacturing process, which overcomes the shortcomings of the prior art, can reduce the thickness of the prism, and can meet the performance requirements of the telephoto optical system.

[0004] According to one aspect of this application, a manufacturing process for an optical switching element used in a telephoto optical system is provided, comprising:

[0005] At least two prisms are provided, the at least two prisms having a first adhesive surface and a second adhesive surface for bonding with each other;

[0006] At least one light-shielding film is provided, the at least one light-shielding film being disposed on the first adhesive surface or the second adhesive surface;

[0007] Calibrate the relative positions of the at least two prisms;

[0008] An adhesive medium is provided between the first adhesive surface and the second adhesive surface of the at least two prisms; and

[0009] The adhesive medium is cured to hold the at least two prisms in the calibrated relative positions to form the light-deflecting element.

[0010] In some embodiments, the at least two prisms include a first prism and a second prism. The first prism includes a first light-incident surface, a first light-exiting surface, and a first reflective surface. The second prism includes a second light-incident surface, a second reflective surface, and a second light-exiting surface. The first light-exiting surface is the first bonding surface for bonding the first prism and the second prism together, and the second light-incident surface is the second bonding surface for bonding the first prism and the second prism together.

[0011] In some embodiments, the at least one light-shielding film includes a first light-shielding film disposed on the first light-emitting surface of the first prism, the first light-shielding film having a "U"-shaped structure with an opening facing the first light-incident surface.

[0012] In some embodiments, the at least one light-shielding film includes a first light-shielding film disposed on the second light-incident surface of the second prism. The first light-shielding film has a "U"-shaped structure with an opening facing the second light-outcrystal surface.

[0013] In some embodiments, the adhesive medium includes a first adhesive medium, which is disposed together with the first light-shielding film on the first bonding surface of the first prism or the second bonding surface of the second prism, wherein the first adhesive medium covers the first light-shielding film.

[0014] In some embodiments, the center of the first light-emitting surface of the first prism is adjusted to be aligned with the center of the second light-incident surface of the second prism, wherein the accuracy range of the alignment between the centers of the first light-emitting surface and the second light-incident surface is ±25µm.

[0015] In some embodiments, the tilt degree between the first light-emitting surface of the first prism and the second light-incident surface of the second prism is adjusted, wherein the accuracy range of the tilt degree between the first light-emitting surface and the second light-incident surface is less than 5 μm.

[0016] In some embodiments, the degree of rotation between the first light-emitting surface of the first prism and the second light-incident surface of the second prism is adjusted, wherein the accuracy range of the degree of rotation between the first light-emitting surface and the second light-incident surface is ±25µm.

[0017] In some embodiments, the relative positions of the first prism and the second prism are first adjusted, then the first adhesive medium is applied to the first adhesive surface or the second adhesive surface, the first adhesive surface and the second adhesive surface are then bonded together by the first adhesive medium, and finally the first adhesive medium is cured to keep the first prism and the second prism in the relative positions determined by calibration to form an optical deflection element.

[0018] In some embodiments, the first adhesive medium is first applied to the first adhesive surface or the second adhesive surface, then the relative positions of the first prism and the second prism are adjusted, then the first adhesive surface and the second adhesive surface are bonded together by the first adhesive medium, and finally the first adhesive medium is cured to maintain the first prism and the second prism in the relative positions determined by calibration to form an optical deflection element.

[0019] In some embodiments, the first adhesive medium is first placed between the first adhesive surface and the second adhesive surface, and the first prism and the second prism are pre-fixed by the first adhesive medium. Then, the relative positions of the first prism and the second prism are adjusted, and finally the first adhesive medium is cured to keep the first prism and the second prism in the relative positions determined by calibration to form a light-transforming element.

[0020] In some embodiments, a first prism, a second prism, and a third prism are provided, wherein the first prism and the second prism have a first adhesive surface and a second adhesive surface for bonding with each other, and the second prism and the third prism have a third adhesive surface and a fourth adhesive surface for bonding with each other.

[0021] A first light-shielding film and a second light-shielding film are provided, the first light-shielding film is disposed on the first adhesive surface or the second adhesive surface, and the second light-shielding film is disposed on the third adhesive surface or the fourth adhesive surface;

[0022] Using the first prism as a reference, calibrate the relative position of the second prism;

[0023] A first adhesive medium is provided between the first adhesive surface and the second adhesive surface, and the first adhesive medium is cured to hold the first prism and the second prism in the position determined by calibration to form a prism semi-finished product;

[0024] Using the semi-finished prism as a reference, calibrate the relative position of the third prism;

[0025] A second adhesive medium is disposed between the third adhesive surface and the fourth adhesive surface, and the second adhesive medium is cured to hold the prism semi-finished product and the third prism in the calibrated determined position to form the light-converting element.

[0026] In some embodiments, the first prism includes a first light-incident surface, a first light-exiting surface, and a first reflective surface; the second prism includes a second light-incident surface, a second reflective surface, and a second light-exiting surface; and the third prism includes a third light-incident surface, a third reflective surface, and a third light-exiting surface. The first light-exiting surface is the first bonding surface for bonding the first prism and the second prism together; the second light-incident surface is the second bonding surface for bonding the first prism and the second prism together; the second light-exiting surface is the third bonding surface for bonding the second prism and the third prism together; and the third light-incident surface is the fourth bonding surface for bonding the second prism and the third prism together.

[0027] In some embodiments, the first light-shielding film and the second light-shielding film are U-shaped structures with openings, and the opening directions of the first light-shielding film and the second light-shielding film are the same.

[0028] In some embodiments, the first light-shielding film and the second light-shielding film are parallel to each other within the light-transforming element, and the height of the first light-shielding film is different from the height of the second light-shielding film.

[0029] In some embodiments, the first light-shielding film and the second light-shielding film are disposed adjacent to each other within the light-transforming element, and the distance between the first light-shielding film and the second light-shielding film ranges from 1.4 mm to 1.8 mm.

[0030] In some embodiments, the relative position of the second prism is first adjusted with the first prism as a reference; then, the first adhesive medium is applied to the first bonding surface, and the first prism and the second prism are bonded together using the first adhesive medium; next, the first adhesive medium is cured to hold the first prism and the second prism in the calibrated position to form a prism semi-finished product; then, the relative position of the third prism is adjusted with the prism semi-finished product as a reference; next, the second adhesive medium is applied to the third bonding surface, and the prism semi-finished product and the third prism are bonded together using the second adhesive medium; finally, the second adhesive medium is cured to hold the third prism and the prism semi-finished product in the calibrated position to form the light-shifting element.

[0031] In some embodiments, the first adhesive medium is first applied to the first bonding surface; then, the relative position of the second prism is adjusted with the first prism as a reference; next, the first prism and the second prism are bonded together using the first adhesive medium; then, the first adhesive medium is cured to hold the first prism and the second prism in the calibrated position to form a prism semi-finished product; next, the second adhesive medium is applied to the third bonding surface; then, the relative position of the third prism is adjusted with the prism semi-finished product as a reference; next, the prism semi-finished product and the third prism are bonded together using the second adhesive medium; finally, the second adhesive medium is cured to hold the third prism and the prism semi-finished product in the calibrated position to form the light-shifting element.

[0032] In another aspect of this application, a light-shifting element for use in a telephoto optical system is provided, comprising:

[0033] At least two prisms, the at least two prisms having a first adhesive surface and a second adhesive surface for bonding with each other;

[0034] At least one light-shielding film is disposed on the first adhesive surface or the second adhesive surface;

[0035] An adhesive medium is disposed between the first adhesive surface and the second adhesive surface of the at least two prisms, and the adhesive medium covers the at least one light-shielding film.

[0036] Further embodiments and features are set forth in part in the following description, and will be understood by those skilled in the art upon review of the specification or through practice of the disclosed subject matter. Further understanding of the features and advantages of this disclosure may be achieved by referring to the remainder of the specification and drawings, which form part of this application. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of a telephoto camera module according to one embodiment of this application;

[0038] Figure 2 This is a schematic diagram of a telephoto optical system according to one embodiment of this application;

[0039] Figure 3 This is a schematic diagram of the structure of the integrated prism cutout;

[0040] Figure 4 This is a schematic diagram of a split-type optical conversion element according to one embodiment of this application;

[0041] Figure 5A It is along Figure 4 A schematic diagram of the cross-section of the light-transforming element of the A-A' line;

[0042] Figure 5B yes Figure 5A Enlarged view of the central circular region;

[0043] Figure 6 This is a schematic diagram of a split-type optical conversion element according to another embodiment of this application;

[0044] Figure 7A It is along Figure 6 A schematic diagram of the cross-section of the optical deflector element of the B-B' line;

[0045] Figure 7B yes Figure 7A Enlarged view of the central circular region;

[0046] Figure 8 This is a schematic diagram showing the position of the center line O on the lower surface of the light-shielding film and the light-deflecting element according to one embodiment of this application.

[0047] Figure 9 This is a manufacturing process flow diagram of an optical switching element according to one embodiment of this application;

[0048] Figure 10This is a manufacturing process flow diagram of an optical switching element according to another embodiment of this application;

[0049] Figure 11 This is a schematic diagram of steps S23 and S25 in the manufacturing process of an optical switching element according to another embodiment of this application. Detailed Implementation

[0050] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0051] The term "comprising" is open-ended. As used in the appended claims, it does not exclude additional structures or steps.

[0052] In the description of this application, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this application.

[0053] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0054] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0055] It should be noted that, as used in this application, the terms “basically,” “approximately,” and similar terms are used to indicate approximation rather than degree, and are intended to describe inherent deviations in measured or calculated values ​​that would be recognized by a person skilled in the art.

[0056] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection, a contact connection, or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0057] "Configured as" refers to various units, circuits, or other components that can be described or stated as being "configured as" to perform one or more tasks. In such a context, "configured as" is used to imply a structure by indicating that the unit / circuit / component includes a structure (e.g., a circuit) that performs this one or more tasks during operation. Furthermore, "configured as" can include a general structure (e.g., a general-purpose circuit) manipulated by software and / or firmware to operate in a manner capable of performing one or more tasks to be solved. "Configured as" can also include adjusting a manufacturing process (e.g., a semiconductor fabrication facility) to manufacture a device (e.g., an integrated circuit) suitable for implementing or performing one or more tasks.

[0058] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the specification and appended claims, the singular forms “a,” “an,” and “the” are intended to also cover the plural forms unless the context otherwise expressly indicates otherwise. It will also be understood that the term “and / or” as used herein refers to and covers any and all possible combinations of one or more of the items listed in connection with the description. It will also be understood that the terms “comprising” and / or “including” as used in this specification specify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0059] As used herein, depending on the context, the term "if" can be interpreted as meaning "when..." or "in response to determination" or "in response to detection". Similarly, depending on the context, the phrase "if it is determined..." or "if [the stated condition or event] is detected" can be interpreted as meaning "when it is determined..." or "in response to determination..." or "when [the stated condition or event] is detected" or "in response to detection".

[0060] A telephoto camera module refers to a camera module with a long focal length, capable of clearly capturing subjects at a greater distance. However, due to its relatively long focal length, a telephoto camera module requires a longer total optical lens length (TTL).

[0061] Increasing TTL increases the size of the camera module, making it unsuitable for integration into small mobile devices.

[0062] Various embodiments in this application relate to prisms suitable for use within optical systems of telephoto camera modules integrated in small mobile devices. In some embodiments, such as Figure 1 As shown, the optical system may include an optical lens 10 with one or more lenses, a light-reflecting element 30, and a photosensitive chip 20. In some embodiments, the light-reflecting element 30 has multiple reflective surfaces, allowing light entering the light-reflecting element 30 to undergo multiple reflections before reaching the photosensitive chip 20. This effectively increases the optical TTL, making the optical system suitable for capturing objects at a distance and providing high-quality images of those distant objects. In some embodiments, the light-reflecting element 30 may have an elongated shape, with its horizontal length exceeding its vertical height, to reduce the height of the telephoto camera module while maintaining an effective TTL, thereby meeting the need for miniaturization of the telephoto camera module. Here, TTL refers to the distance along the optical axis between the front vertex of the incident side (facing the subject) of the optical lens 10 of the camera module and the imaging surface of the photosensitive chip 20 of the camera module. In some embodiments, the light-reflecting element 30 may be a single, integrated prism. In some embodiments, the light-reflecting element 30 may be a split prism, for example, a prism formed by combining at least two prisms.

[0063] like Figure 2 As shown, in one embodiment of this application, the light-deflecting element 30 includes an upper surface 301, a lower surface 303, and at least two side surfaces 302 connecting the upper surface 301 and the lower surface 303, wherein at least three of the upper surface 301, lower surface 303, and at least two side surfaces 302 are reflective surfaces. For example, a reflective coating or a reflector may be provided on at least three of the upper surface 301, lower surface 303, and at least two side surfaces 302 of the light-deflecting element 30, so that light can be reflected on the reflective surfaces of the light-deflecting element 30.

[0064] In one embodiment of this application, the light-deflecting element 30 is implemented as a trapezoidal prism. The trapezoidal prism includes an upper surface 301, a lower surface 303, and a first side surface 3021 and a second side surface 3022 connecting the upper surface 301 and the lower surface 303. The upper surface 301 and the lower surface 303 are parallel to each other, the length of the upper surface 301 is greater than the length of the lower surface 303, and the plane containing the first side surface 3021 intersects the plane containing the second side surface 3022. It should be understood that the trapezoidal prism can include a prism with a trapezoidal cross-section or a prism with an approximately trapezoidal cross-section. A prism with an approximately trapezoidal cross-section refers to removing the exposed edges of the prism during the manufacturing process. For example, the angle between the upper surface 301 and at least two side surfaces 302 is removed, so that the upper surface 301 and at least two side surfaces 302 are connected by a plane or an arc surface. Without affecting light propagation, this avoids prism breakage upon impact and also reduces the length of the prism. In one embodiment of this application, such as Figure 4 and Figure 5A As shown, the cross-section refers to the cross-section formed along the A-A' line direction. In another embodiment of this application, as... Figure 6 and Figure 7A As shown, the cross section refers to the cross section formed along the direction of line B-B'.

[0065] In telephoto camera modules, such as Figure 1 As shown, it includes an optical lens 10, a light-deflecting element 30, and a photosensitive chip 20. The light-deflecting element 30 is disposed between the optical lens 10 and the photosensitive chip 20. The light-deflecting element 30 folds the light emitted from the optical lens 10 and guides it to the photosensitive chip 20, thereby enabling the photosensitive chip 20 to form an image and obtain image information.

[0066] In a specific example of this application, the photosensitive chip 20 and the optical lens 10 are disposed on the same side of the light-shifting element 30, so that the height dimension of the camera module only needs to be considered as the sum of the height dimension of one of the photosensitive chip 20 and the optical lens 10 and the height dimension of the light-shifting element 30, without having to simultaneously superimpose the heights of the optical lens 10, the light-shifting element 30 and the photosensitive chip 20. In this way, the height dimension of the camera module can be reduced.

[0067] In one embodiment of this application, such as Figure 2As shown, the upper surface 301 of the light-reversing element 30 includes an incident light area 3011, an exit light area 3013, and a reflective area 3012 disposed between the incident light area 3011 and the exit light area 3013. The optical lens 10 faces the incident light area 3011 of the upper surface 301, and the photosensitive chip 20 faces the exit light area 3013 of the upper surface 301, so that light emitted from the optical lens 10 undergoes multiple reflections within the light-reversing element 30 before reaching the photosensitive chip 20. The incident light area 3011 and the exit light area 3013 are not coated with a reflective coating, allowing light to enter the light-reversing element 30 from the incident light area 3011 and exit from the exit light area 3013. The reflective area 3012 is coated with a reflective coating, so that light passing through the reflective area 3012 is reflected by total internal reflection.

[0068] It should be understood that total internal reflection can occur when the angle of incidence of light is close to or greater than a certain limiting angle (called the critical angle). The angle of incidence is the angle between the light incident on the surface and the line perpendicular to the surface at the point of incidence (called the normal). Therefore, when the angle of incidence of light is less than the critical angle, the light-incident area 3011 and the light-exit area 3013 of the upper surface 301 of the light-reversing element 30 allow light to pass through; when the angle of incidence of light is close to or greater than the critical angle, the light-reflecting area 3012 of the upper surface 301 of the light-reversing element 30 reflects the light.

[0069] In one embodiment of this application, such as Figure 2 As shown, the light-reflecting element 30 reflects light within the light-reflecting element 30 an odd number of times to guide light from the optical lens 10 through the light-reflecting element 30 to the photosensitive chip 20. When light undergoes three reflections within the light-reflecting element 30, the light enters the light-reflecting element 30 through the light-incident area 3011 of the upper surface 301; at least some of the light passing through the light-incident area 3011 of the upper surface 301 is reflected at the first side surface 3021; ​​at least some of the light reflected from the first side surface 3021 is reflected at the reflection area 3012 of the upper surface 301; and at least some of the light reflected from the reflection area 3012 of the upper surface 301 is reflected at the second side surface 3022, so that the light passes through the light-out area 3013 of the upper surface 301 to reach the photosensitive chip 20.

[0070] It is understandable that, for optical systems, stray light from the environment can enter the optical system from various directions of the camera module. When stray light enters the optical system, it causes glare and affects the imaging effect. Therefore, to solve the above problem, in this application, the light-transforming element 30 further includes a light-shielding film 31, which is disposed inside the light-transforming element 30 and / or on the surface of the light-transforming element 30 to reduce stray light entering the light-transforming element 30 and reduce glare generation. The light-shielding film 31 can be implemented as a light-shielding coating, a dark-colored paint, such as black ink, etc.

[0071] This should be understandable, such as Figure 3 As shown in this application, when the light-shifting element 30 is implemented as an integral prism, it is usually necessary to set such as... within the integral prism. Figure 3 The cut 33 shown is provided, and a light-shielding film 31 is provided within the cut 33 to block stray light. The cut 33 is formed by using a cutting tool to cut into the interior of the light-reflecting element 30 from the surface of the light-reflecting element 30, and coating the cut 33 and / or one or more inner surfaces of the cut 33 with material to create the light-shielding film 31, so that the light-shielding film 31 can cover the area of ​​stray light, block the light path of stray light, and prevent stray light from reaching the photosensitive chip 20 and affecting the imaging effect.

[0072] However, in this method of forming the cut 33, the size of the cutting tool results in the cut 33 having a certain thickness and depth. Furthermore, as the depth of the cut 33 increases, its thickness also increases. This leads to an increase in the thickness of the coating material disposed within the cut 33, and consequently, an increase in the thickness of the light-shielding film 31 produced by the coating material. This makes the light-shielding film 31 more likely to block some effective light, thus affecting the imaging effect of the photosensitive chip 20. Furthermore, the presence of the cut 33 also compromises the structural strength of the integrated prism, making it more prone to breakage.

[0073] Therefore, in one embodiment of this application, such as Figures 4 to 8 As shown, the light-shifting element 30 is implemented as a split prism. For example, the split prism can be formed by combining at least two prisms together using, for example, an optically transparent adhesive or fastening method. When the light-shifting element 30 is implemented as a split structure, a light-shielding film 31 can be directly placed between the at least two prisms without the need for a cut 33. This simplifies the process of setting the light-shielding film 31 and avoids increasing its thickness, ensuring that the light-shielding film 31 blocks stray light without blocking the effective light path, thus avoiding any impact on the imaging effect of the photosensitive chip 20. Furthermore, during the process of combining at least two prisms to form the light-shifting element 30, the relative positions of the at least two prisms can be adjusted to ensure that the split prism has better optical performance in the optical system.

[0074] Furthermore, during the mass production of prisms, inconsistencies can arise between prisms, making it difficult to guarantee that two prisms are symmetrical. Therefore, in this application, combining at least two asymmetrical prisms to form the optical conversion element 30 not only reduces manufacturing requirements and the defect rate, but also allows for adjustment of the relative positions of the at least two asymmetrical prisms during assembly, ensuring that the assembled optical conversion element 30 exhibits superior optical performance within the optical system.

[0075] In one embodiment of this application, the light-shifting element 30 includes a first prism 34a and a second prism 35a. In this example, the light-shifting element 30 may be trapezoidal in shape, and therefore can be composed of two trapezoidal prisms with non-symmetrical structures; alternatively, it may be formed using a triangular prism and a trapezoidal prism. In another embodiment of this application, the light-shifting element 30 includes a first prism 34b, a second prism 35b, and a third prism 36b. The light-shifting element 30 may be trapezoidal in shape, and therefore can be composed of two trapezoidal prisms with non-symmetrical structures and a rectangular prism; alternatively, it may be composed of a triangular prism, a rectangular prism, and a trapezoidal prism. Of course, in other embodiments of this application, the light-shifting element 30 may also include a fourth prism, a fifth prism, etc., and this application does not impose any limitations on this.

[0076] It is worth mentioning that when the light-shifting element 30 is implemented as a split prism, the assembly accuracy of at least two prisms will affect the performance of the light-shifting element 30. Therefore, in one embodiment of this application, a manufacturing process for the light-shifting element 30 is provided, which can not only simplify the manufacturing process of the light-shielding film 31, but also adjust the relative positions of at least two non-symmetrical prisms during the assembly process of the light-shifting element 30, so that the assembled light-shifting element 30 has better optical performance in the optical system.

[0077] like Figure 9 The manufacturing process of the optical switching element 30 includes the following steps:

[0078] S11: Provide at least two prisms, the at least two prisms having a first adhesive surface 304 and a second adhesive surface 305 for bonding with each other.

[0079] S12: Provide at least one light-shielding film 31, wherein the light-shielding film 31 is disposed on the first adhesive surface 304 or the second adhesive surface 305.

[0080] S13: Calibrate the relative positions of at least two prisms.

[0081] S14: An adhesive medium 32 is provided between the first adhesive surface 304 and the second adhesive surface 305 of at least two prisms.

[0082] S15: Curing the adhesive medium 32 to hold at least two prisms in the relative positions determined by calibration to form the light-transforming element 30.

[0083] It should be understood that steps S11 to S14 in this application do not represent a sequential relationship, but only indicate that the manufacturing process of the optical switching element 30 includes the above steps. For example, step S13 can be before or after step S14.

[0084] In one embodiment of this application, such as Figures 4 to 5B The following description uses an optical deflection element 30 comprising two prisms as an example. In step S11 above, at least two prisms include a first prism 34a and a second prism 35a, wherein the first prism 34a and the second prism 35a are prisms with non-symmetrical structures. For example, as... Figure 4 As shown, the first prism 34a is implemented as a first trapezoidal prism, and the second prism 35a is implemented as a second trapezoidal prism. In the cross-sectional view of the light-converting element 30, the first prism 34a and the second prism 35a are asymmetrical about the center line O of the lower surface 303 of the light-converting element 30.

[0085] Specifically, the first prism 34a includes a first light-incident surface 341a, a first light-exiting surface 344a, a first surface 343a, and a first reflective surface 342a. The first light-incident surface 341a, the first light-exiting surface 344a, the first surface 343a, and the first reflective surface 342a are sequentially connected to form a trapezoidal structure. The first light-incident surface 341a and the first surface 343a are parallel to each other. The first reflective surface 342a connects the first light-incident surface 341a and the first surface 343a. The first light-exiting surface 344a serves as the first bonding surface 304 between the first prism 34a and the second prism 35a for mutual bonding. It should be understood that, as mentioned above, in order to reduce the possibility of the first prism 34a breaking, the angle between the first incident surface 341a and the first reflecting surface 342a can be removed so that the first incident surface 341a and the first reflecting surface 342a are connected by a plane or an arc surface.

[0086] The second prism 35a includes a second incident surface 351a, a second surface 352a, a second reflecting surface 353a, and a second emitting surface 354a. The second incident surface 351a, second surface 352a, second reflecting surface 353a, and second emitting surface 354a are sequentially connected to form a trapezoidal structure. The second emitting surface 354a is parallel to the second surface 352a. The second reflecting surface 353a connects the second emitting surface 354a and the second surface 352a. The second incident surface 351a connects the second emitting surface 354a and the second surface 352a. The second incident surface 351a of the second prism 35a serves as a second bonding surface 305 between the first prism 34a and the second prism 35a for mutual bonding. It should be understood that, as mentioned above, in order to reduce the possibility of the second prism 35a breaking, the angle between the second light-emitting surface 354a and the second reflective surface 353a can be removed so that the second light-emitting surface 354a and the second reflective surface 353a are connected by a plane or an arc surface.

[0087] When the first prism 34a and the second prism 35a are combined to form a light-reflecting element 30, the first light-incident surface 341a of the first prism 34a and the second light-exit surface 354a of the second prism 35a form the upper surface 301 of the light-reflecting element 30, and the first reflecting surface 342a of the first prism 34a and the second reflecting surface 353a of the second prism 35a form the two side surfaces 302 of the light-reflecting element 30. The first surface 343a of the first prism 34a and the second surface 352a of the second prism 35a form the lower surface 303 of the light-reflecting element 30.

[0088] Furthermore, the first light-emitting surface 344a of the first prism 34a and the second light-incident surface 351a of the second prism 35a are of the same size, so as to achieve higher consistency when the first light-emitting surface 344a and the second light-incident surface 351a are bonded. Even further, in situations such as Figure 5A In the cross-sectional view shown, the length of the first surface 343a of the first prism 34a is different from the length of the second surface 352a of the second prism 35a, and the length of the first light-incident surface 341a of the first prism 34a is different from the length of the second light-exit surface 354a of the second prism 35a.

[0089] In step S12: The light-shielding film 31 can be disposed between the first prism 34a and the second prism 35a on either the first adhesive surface 304 or the second adhesive surface 305 for mutual bonding. For example, the light-shielding film 31 can be disposed on the first adhesive surface 304 of the first prism 34a, i.e., the first light-emitting surface 344a, or the light-shielding film 31 can be disposed on the second adhesive surface 305 of the second prism 35a, i.e., the second light-incident surface 351a. In this way, the process of disposing of the light-shielding film 31 is simpler, and the thickness of the light-shielding film 31 is more controllable, which can avoid the situation where the effective light is blocked due to the excessive thickness of the light-shielding film 31.

[0090] Specifically, such as Figure 5A and Figure 5B As shown, the light-shielding film 31 includes a first light-shielding film 311, which is disposed on a first light-emitting surface 344a or a second light-incident surface 351a bonded together. For example, in one specific example of this application, when the first light-shielding film 311 is disposed on the first light-emitting surface 344a of the first prism 34a, the first light-shielding film 311 extends from the side where the first surface 343a is located along the height direction toward the side where the first light-incident surface 341a is located, and the first light-shielding film 311 has a "U"-shaped structure with an opening, the opening direction being toward the side where the first light-incident surface 341a is located. For example, in another specific example of this application, when the first light-shielding film 311 is disposed on the second light-incident surface 351a of the second prism 35a, the first light-shielding film 311 extends from the side where the second surface 352a is located along the height direction toward the side where the second light-emitting surface 354a is located, and the first light-shielding film 311 has a "U"-shaped structure with an opening, the opening direction being toward the side where the second light-emitting surface 354a is located.

[0091] In one embodiment of this application, when the first prism 34a and the second prism 35a are combined to form a light-shifting element 30, a first light-shielding film 311 is disposed inside the light-shifting element 30 and extends from the lower surface 303 of the light-shifting element 30 toward the upper surface 301 of the light-shifting element 30. The first light-shielding film 311 has a certain extension height within the light-shifting element 30, wherein the ratio of the height of the first light-shielding film 311 to the height of the light-shifting element 30 ranges from 0.4726 to 0.6300. It should be understood that 0.4726 to 0.6300 includes the extreme values ​​of 0.4726 and 0.6300. In a specific example of this application, the height of the first light-shielding film is 2.371 mm, the height of the light-shifting element is 4.1 mm, and the ratio of the height of the first light-shielding film 311 to the height of the light-shifting element 30 is 0.5783.

[0092] In this application, when the first light-shielding film 311 has a "U"-shaped structure with an opening, the first light-shielding film 311 has a structure located on the side of the opening and a structure located at the bottom of the opening. The height of the first light-shielding film 311 mentioned in this application refers to the height of the structure located at the bottom of the opening.

[0093] Furthermore, when the camera module performs optical focusing or optical image stabilization, the optical path of the light propagating within the light-transfer element 30 may change. This could cause stray light to be generated in the light-transfer element 30 that cannot be blocked by the first light-shielding film 311. Moreover, tolerances may arise during the manufacturing process of the light-transfer element 30, and these tolerances could also cause stray light to be generated that cannot be blocked by the first light-shielding film 311. Therefore, in this application, a certain height margin is provided for the first light-shielding film 311 so that it can still block the stray light even when the optical path of the stray light reaches its limit. In one specific embodiment of this application, the height range of the first light-shielding film 311 is 1.908 mm to 2.371 mm, wherein the height margin of the first light-shielding film 311 is 0.463 mm. It should be understood that 1.908 mm to 2.371 mm includes the extreme values ​​of 1.908 mm and 2.371 mm.

[0094] In step S13, it is worth mentioning that before bonding and curing the first prism 34a and the second prism 35a using the adhesive medium 32, the relative positions of the first prism 34a and the second prism 35a need to be calibrated to ensure that the assembled light-converting element 30 has good optical performance in the optical system. It should be understood that the relative positions of the first prism 34a and the second prism 35a can be adjusted in multiple degrees of freedom (e.g., six-axis adjustment), including but not limited to translation, rotation, and tilt adjustments between the first prism 34a and the second prism 35a.

[0095] Specifically, calibrating the relative positions of the first prism 34a and the second prism 35a involves aligning the center of the first light-emitting surface 344a of the first prism 34a with the center of the second light-incident surface 351a of the second prism 35a. The alignment accuracy between the centers of the first light-emitting surface 344a and the second light-incident surface 351a is ±25µm.

[0096] Specifically, calibrating the relative positions of the first prism 34a and the second prism 35a involves adjusting the tilt between the first light-emitting surface 344a of the first prism 34a and the second light-incident surface 351a of the second prism 35a, to ensure that the first light-emitting surface 344a and the second light-incident surface 351a are as parallel as possible. The accuracy range of the tilt between the first light-emitting surface 344a and the second light-incident surface 351a is less than 5 μm.

[0097] Specifically, calibrating the relative positions of the first prism 34a and the second prism 35a involves adjusting the degree of rotation between the first light-emitting surface 344a of the first prism 34a and the second light-incident surface 351a of the second prism 35a, so that the edges and corners of the first light-emitting surface 344a are aligned with the edges and corners of the second light-incident surface 351a. The accuracy range of the degree of rotation between the first light-emitting surface 344a and the second light-incident surface 351a is ±25µm.

[0098] It should be understood that the aforementioned accuracy range can also be referred to as the assembly tolerance range of the first prism 34a and the second prism 35a that is acceptable to the optical system.

[0099] In one embodiment of this application, step S14 can be performed before or after step S13. The adhesive medium 32 includes a first adhesive medium 321. In one embodiment of this application, the relative positions of the first prism 34a and the second prism 35a can be adjusted first to align them; then, the first adhesive medium 321 is applied to the first bonding surface 304 or the second bonding surface where the first prism 34a and the second prism 35a are bonded; next, the first bonding surface 304 and the second bonding surface 305 are bonded together using the first adhesive medium 321; finally, the first adhesive medium 321 is cured to maintain the first prism 34a and the second prism 35b in the calibrated relative positions to form the light-transforming element 30.

[0100] In another embodiment of this application, a first adhesive medium 321 can be first applied to the first adhesive surface 304 or the second adhesive surface 305 where the first prism 34a and the second prism 35a are bonded together; then the relative positions of the first prism 34a and the second prism 35a are adjusted; next, the first adhesive surface 304 and the second adhesive surface 305 are bonded together by the first adhesive medium 321; finally, the first adhesive medium 321 is cured to hold the first prism 34a and the second prism 35b in the relative position determined by calibration to form the light-transforming element 30.

[0101] In another embodiment of this application, a first adhesive medium 321 is first provided between the first adhesive surface 304 and the second adhesive surface 305 where the first prism 34a and the second prism 35a are glued together, and the first prism 34a and the second prism 35a are pre-fixed by the first adhesive medium 321; then the relative positions of the first prism 34a and the second prism 35a are adjusted so that the first prism 34a and the second prism 35a are aligned; finally, the first adhesive medium 321 is cured to hold at least two prisms in the relative positions determined by calibration to form the light-transforming element 30.

[0102] In step S14, a first adhesive medium 321 is disposed between the first light-emitting surface 344a of the first prism 34a and the second light-incident surface 351a of the second prism 35a to bond the first prism 34a and the second prism 35a together. The first adhesive medium 321 can be first disposed on the first light-emitting surface 344a of the first prism 34a, and then the second light-incident surface 351a of the second prism 35a is attached to the first adhesive medium 321. Alternatively, the first adhesive medium 321 can be first disposed on the second light-incident surface 351a of the second prism 35a, and then the first light-emitting surface 344a of the first prism 34a is attached to the first adhesive medium 321.

[0103] The first adhesive medium 321 can cover the entire first light-emitting surface 344a and the second light-incident surface 351a. This allows either the first light-emitting surface 344a or the second light-incident surface 351a to maintain a relatively flat plane, preventing air bubbles from forming due to compression when the first light-emitting surface 344a and the second light-emitting surface 354a are bonded together. Air bubbles within the first adhesive medium 321 would affect the optical path of the light and generate new stray light, impacting the imaging effect. Alternatively, in other embodiments of this application, the first adhesive medium 321 may only cover a portion of the first light-emitting surface 344a and the second light-incident surface 351a to prevent overflow and contamination of the prism surface.

[0104] In one embodiment of this application, the thickness of the first adhesive medium 321 is 5-10 μm. The first adhesive medium 321 can be a thermosetting adhesive, a UV adhesive, a UV thermosetting adhesive, or an adhesive made of other materials.

[0105] In one embodiment of this application, reference continues to be made to... Figure 4The first adhesive medium 321 and the first light-shielding film 311 are disposed together on the same bonding surface of the prism, with the first adhesive medium 321 covering the first light-shielding film 311. For example, both the first adhesive medium 321 and the first light-shielding film 311 are disposed on the first bonding surface 304 of the first prism 34a or the second bonding surface 305 of the second prism 35a. Specifically, when the first light-shielding film 311 is disposed on the first light-emitting surface 344a of the first prism 34a, the first adhesive medium 321 is also disposed on the first light-emitting surface 344a of the first prism 34a, and the first adhesive medium 321 covers the first light-shielding film 311. It should be understood that the first light-shielding film 311 protrudes from the plane where the first light-emitting surface 344a is located. The first adhesive medium 321 can not only fill the part of the first light-emitting surface 344a where the first light-shielding film 311 is not provided, but also make the first light-emitting surface 344a with the first adhesive medium 321 still maintain a relatively flat plane. When the first light-emitting surface 344a and the second light-emitting surface 354a are bonded together, the first adhesive medium 321 can be prevented from being squeezed and generating air bubbles.

[0106] Of course, in another embodiment of this application, the first adhesive medium 321 and the first light-shielding film 311 may also be disposed on the bonding surfaces of different prisms. For example, the first adhesive medium 321 may be disposed on the first light-emitting surface 344a of the first prism 34a, and the first light-shielding film 311 may be disposed on the second light-incident surface 351a of the second prism 35a.

[0107] In one embodiment of this application, the light-shifting element 30 is described as comprising three prisms. Figure 10 As shown, the manufacturing process of the optical switching element 30 includes the following steps:

[0108] S21: Provide a first prism 34b, a second prism 35b and a third prism 36b, wherein the first prism 34b and the second prism 35b have a first adhesive surface 304 and a second adhesive surface 305 for bonding with each other, and the second prism 35b and the third prism 36b have a third adhesive surface 306 and a fourth adhesive surface 307 for bonding with each other.

[0109] S22: Provide a first light-shielding film 311 and a second light-shielding film 312, with the first light-shielding film 311 disposed on the first adhesive surface 304 or the second adhesive surface 305, and the second light-shielding film 312 disposed on the third adhesive surface 306 or the fourth adhesive surface 307.

[0110] S23: Using the first prism 34b as a reference, calibrate the relative position of the second prism 35b.

[0111] S24: A first adhesive medium 321 is provided between the first adhesive surface 304 and the second adhesive surface 305 to bond the first prism 34b and the second prism 35b together through the first adhesive medium 321, and the first adhesive medium 321 is cured to keep the first prism 34b and the second prism 35b in the position determined by calibration to form a prism semi-finished product.

[0112] S25: Using the semi-finished prism as a reference, calibrate the relative position of the third prism 36b.

[0113] S26: A second adhesive medium 322 is provided between the third adhesive surface 306 and the fourth adhesive surface 307 to bond the third prism 36b and the prism semi-finished product together through the second adhesive medium 322, and to cure the second adhesive medium 322 to hold the prism semi-finished product and the third prism 36b in the position determined by calibration to form the light-converting element 30.

[0114] It should be understood that steps S21 to S26 in this application do not imply a sequential relationship, but merely indicate that the manufacturing process of the optical switching element 30 includes the above steps. For example, step S23 may be before or after step S24. Step S25 may be before or after step S26.

[0115] In step S21, as Figures 6 to 8 As shown, at least two prisms include a first prism 34b, a second prism 35b, and a third prism 36b. The second prism 35b is located between the first prism 34b and the third prism 36b. The first prism 34b and the third prism 36b have a non-symmetrical structure. The first prism 34b, the second prism 35b, and the third prism 36b are combined to form a light-deflecting element 30. Specifically, the first prism 34b is implemented as a first trapezoidal prism, the second prism 35b is implemented as a rectangular prism, and the third prism 36b is implemented as a second trapezoidal prism. In the cross-section of the light-deflecting element 30, the first prism 34b and the third prism 36b are asymmetrical about the centerline O of the lower surface 303 of the light-deflecting element 30.

[0116] Specifically, the first prism 34b includes a first light-incident surface 341b, a first light-exiting surface 344b, a first surface 343b, and a first reflective surface 342b. The first light-incident surface 341b, the first light-exiting surface 344b, the first surface 343b, and the first reflective surface 342b are sequentially connected to form a trapezoidal structure. The first light-incident surface 341b and the first surface 343b are parallel to each other. The first reflective surface 342b connects the first light-incident surface 341b and the first surface 343b. The first light-exiting surface 344b serves as the first bonding surface 304 between the first prism 34b and the second prism 35b for mutual bonding. It should be understood that, as mentioned above, in order to reduce the possibility of the first prism 34b breaking, the angle between the first incident surface 341b and the first reflecting surface 342b can be removed so that the first incident surface 341b and the first reflecting surface 342b are connected by a plane or an arc surface.

[0117] The second prism 35b includes a second light-incident surface 351b, a second reflective surface 353b, a second light-emitting surface 354b, and a second surface 352b. The second light-incident surface 351b, the second reflective surface 353b, the second light-emitting surface 354b, and the second surface 352b are sequentially connected to form a rectangular structure. The second light-incident surface 351b and the second light-emitting surface 354b are parallel to each other, as are the second reflective surface 353b and the second surface 352b. The second light-incident surface 351b of the second prism 35b serves as a second bonding surface 305 for bonding the first prism 34b and the second prism 35b together. The second light-emitting surface 354b of the second prism 35b serves as a third bonding surface 306 for bonding the second prism 35b and the third prism 36b together.

[0118] The third prism 36b includes a third incident surface 361b, a third surface 362b, a third reflecting surface 363b, and a third emitting surface 364b. The third incident surface 361b, third surface 362b, third reflecting surface 363b, and third emitting surface 364b are sequentially connected to form a trapezoidal structure. The third emitting surface 364b is parallel to the third surface 362b. The third reflecting surface 363b connects the third emitting surface 364b and the third surface 362b. The third incident surface 361b connects the third emitting surface 364b and the third surface 362b. The third incident surface 361b of the third prism 36b serves as the fourth bonding surface 307 for the second prism 35b and the third prism 36b to be bonded together. It should be understood that, as mentioned above, in order to reduce the possibility of the third prism 36b breaking, the angle between the third light-emitting surface 364b and the third reflective surface 363b can be removed so that the third light-emitting surface 364b and the third reflective surface 363b are connected by a plane or an arc surface.

[0119] When the first prism 34b, the second prism 35b, and the third prism 36b are combined to form a light-shifting element 30, the first light-incident surface 341b of the first prism 34b, the second reflective surface 353b of the second prism 35b, and the third light-exiting surface 364b of the third prism 36b constitute the upper surface 301 of the light-shifting element 30. Specifically, the first light-incident surface 341b is the light-incident region 3011 of the upper surface 301 of the light-shifting element 30, the second reflective surface 353b is the reflective region 3012 of the upper surface 301 of the light-shifting element 30, and the third light-exiting surface 364b is the light-exiting region 3013 of the upper surface 301 of the light-shifting element 30. The first reflective surface 342b of the first prism 34b and the third reflective surface 363b of the third prism 36b constitute the two side surfaces 302 of the light-shifting element 30. The first surface 343b of the first prism 34b, the second surface 352b of the second prism 35b, and the third surface 362b of the third prism 36b constitute the lower surface 303 of the light-converting element 30. The first light-emitting surface 344b of the first prism 34b and the second light-incident surface 351b of the second prism 35b correspond to each other and are bonded together by the first adhesive medium 321. The second light-emitting surface 354b of the second prism 35b and the third light-incident surface 361b of the third prism 36b correspond to each other and are bonded together by the second adhesive medium 322.

[0120] Furthermore, the first light-emitting surface 344b of the first prism 34b has the same size as the second light-incident surface 351b of the second prism 35b, and the second light-emitting surface 354b of the second prism 35b has the same size as the third light-incident surface 361b. This ensures higher consistency when the first light-emitting surface 344b and the second light-incident surface 351b are fitted together, and also higher consistency when the second light-emitting surface 354b and the third light-incident surface 361b are fitted together. Of course, when the second prism 35b is implemented as a rectangular prism, the second light-incident surface 351b and the second light-emitting surface 354b have the same size, and therefore the first light-emitting surface 344b and the third light-incident surface 361b have the same size.

[0121] In one embodiment of this application, the length of the first surface 343b of the first prism 34b is different from the length of the third surface 362b of the third prism 36b. Further, the lengths of the first surface 343b of the first prism 34b, the second surface 352b of the second prism 35b, and the third surface 362b of the third prism 36b are all different.

[0122] In step S22, the light-shielding film 31 includes a first light-shielding film 311 and a second light-shielding film 312. The first light-shielding film 311 is disposed on the first adhesive surface 304 or the second adhesive surface 305 between the first prism 34b and the second prism 35b, where they are bonded together. The second light-shielding film 312 is disposed on the third adhesive surface 306 or the fourth adhesive surface 307 between the second prism 35b and the third prism 36b, where they are bonded together. This simplifies the process of setting the light-shielding film 31 and makes its thickness more controllable, preventing the film from blocking effective light due to its excessive thickness.

[0123] In one embodiment of this application, the first light-shielding film 311 and the second light-shielding film 312 have a relatively thin thickness. It should be understood that the light-shielding film 31 protrudes from the surface of the prism. When the thickness of the light-shielding film 31 is relatively thick, it will, on the one hand, block the light in the effective optical path; on the other hand, when the two prisms are bonded together, the adhesive medium will be squeezed near the light-shielding film 31, increasing the possibility of air bubbles being generated. These air bubbles will affect the optical path and generate new stray light, affecting the imaging effect. In this application, the light-shielding film 31 can be formed using a deposition etching process or a screen printing process to achieve a relatively thin thickness.

[0124] In one embodiment of this application, the first light-shielding film 311 and the second light-shielding film 312 are arranged parallel to each other so that the first light-shielding film 311 and the second light-shielding film 312 can absorb stray light from the first reflective surface 342b and the third reflective surface 363b, thereby reducing the generation of glare and thus avoiding affecting the imaging effect.

[0125] In one embodiment of this application, reference is made to Figure 6 The first light-shielding film 311 and the second light-shielding film 312 are disposed on the same prism. For example, the first light-shielding film 311 is disposed on the second light-incident surface 351b of the second prism 35b, and the second light-shielding film 312 is disposed on the second light-exit surface 354b of the second prism 35b. In this way, the prism does not need to be replaced during the manufacturing process of the first light-shielding film 311 and the second light-shielding film 312, which can improve production efficiency.

[0126] In another embodiment of this application, reference is made to Figure 7A and Figure 7B The first light-shielding film 311 and the second light-shielding film 312 can also be disposed on different prisms. For example, the first light-shielding film 311 is disposed on the first light-emitting surface 344b of the first prism 34b, and the second light-shielding film 312 is disposed on the third light-incident surface 361b of the third prism 36b. In this way, the prism flipping can be reduced during the manufacturing process of the first light-shielding film 311 and the second light-shielding film 312, thereby improving production efficiency.

[0127] In one embodiment of this application, the first light-shielding film 311 and the second light-shielding film 312 are U-shaped structures with openings, and the opening directions of the first light-shielding film 311 and the second light-shielding film 312 are the same. For example, the first light-shielding film 311 is disposed on the second light-emitting surface of the second prism 35b, extending from the side where the second surface 352b is located along the height direction toward the side where the second reflective surface 353b is located, and the first light-shielding film 311 is U-shaped with openings, the opening direction of which is toward the side where the second reflective surface 353b is located. The second light-shielding film 312 is disposed on the second light-emitting surface 354b of the second prism 35b, extending from the side where the second surface 352b is located along the height direction toward the side where the second reflective surface 353b is located, and the second light-shielding film 312 is U-shaped with openings, the opening direction of which is toward the side where the second reflective surface 353b is located.

[0128] In another embodiment of this application, a first light-shielding film 311 is disposed on the first light-emitting surface 344b of the first prism 34b. The first light-shielding film 311 extends along the height direction from the side where the first surface 343b is located toward the side where the first light-incident surface 341b is located. The first light-shielding film 311 has a "U"-shaped structure with an opening, and the opening is directed toward the side where the first light-incident surface 341b is located. A second light-shielding film 312 is disposed on the third light-incident surface 361b of the third prism 36b. The second light-shielding film 312 extends along the height direction from the side where the third surface 362b is located toward the side where the third light-emitting surface 364b is located. The second light-shielding film 312 has a "U"-shaped structure with an opening, and the opening is directed toward the side where the third light-emitting surface 364b is located. As mentioned above, the optical lens 10 and the photosensitive chip 20 are positioned on the same side of the light-reversing element 30, meaning that light enters or exits on the same side of the light-reversing element 30. This makes the light path within the light-reversing element 30 asymmetrical, and consequently, the light path of stray light within the light-reversing element 30 is also asymmetrical, such as... Figure 2 As shown. In order to block stray light as much as possible, the first light-blocking film 311 and the second light-blocking film 312 are not symmetrically arranged within the light-transforming element 30 with respect to the center line O of the lower surface 303 of the light-transforming element 30.

[0129] Furthermore, since the position of the first light-shielding film 311 is related to the position of the first bonding surface 304 of the first prism 34b and the second bonding surface 305 of the second prism 35b, and the position of the second light-shielding film 312 is related to the position of the third bonding surface 306 of the second prism 35b and the fourth bonding surface 307 of the third prism 36b, it is more likely that when the first prism 34b and the third prism 36b are asymmetrical structures, the first light-shielding film 311 and the second light-shielding film 312 will be asymmetrical relative to the centerline O of the lower surface 303 of the light-refracting element 30.

[0130] Specifically, please refer to Figure 8 When the first prism 34b, the second prism 35b, and the third prism 36b are combined to form the light-transforming element 30, the first light-shielding film 311 and the second light-shielding film 312 can be arranged adjacently within the light-transforming element 30 to block stray light propagating in an asymmetric optical path within the light-transforming element 30. The distance between the first light-shielding film 311 and the second light-shielding film 312 ranges from 1.4 mm to 1.8 mm. In a specific example of this application, the distance between the first light-shielding film 311 and the second light-shielding film 312 is 1.597 mm.

[0131] In a specific example of this application, the first light-shielding film 311 and the second light-shielding film 312 are located on the same side of the center line O of the lower surface 303 of the light-transforming element 30, and the distance between the first light-shielding film 311 and the center line O of the lower surface 303 is less than the distance between the second light-shielding film 312 and the center line O of the lower surface 303. For example, the distance between the first light-shielding film 311 and the center line O of the lower surface 303 ranges from 0.04 mm to 0.1 mm, and the distance between the second light-shielding film 312 and the center line O of the lower surface 303 ranges from 1.4 mm to 2 mm. In a specific example of this application, the distance between the first light-shielding film 311 and the center line O of the lower surface 303 is 0.056 mm, and the distance between the second light-shielding film 312 and the center line O of the lower surface 303 is 1.65 mm.

[0132] Specifically, when the first prism 34b, the second prism 35b, and the third prism 36b are combined to form the light-shifting element 30, the first light-shielding film 311 and the second light-shielding film 312 extend from one side of the light-shifting element 30 toward the opposite side. That is, both the first light-shielding film 311 and the second light-shielding film 312 extend from the lower surface 303 of the light-shifting element 30 toward the upper surface 301 along the height direction, and the opening directions of the first light-shielding film 311 and the second light-shielding film 312 are the same. The first light-shielding film 311 and the second light-shielding film 312 have different heights to block stray light propagating in an asymmetric optical path within the light-shifting element 30. In one embodiment of this application, the height of the first light-shielding film 311 is greater than the height of the second light-shielding film 312. For example, the height range of the first light-shielding film 311 is 1.908 mm to 2.371 mm, and the height range of the second light-shielding film 312 is 0.98 mm to 1.65 mm. In a specific example of this application, the height of the first light-shielding film 311 is 1.98 mm, and the height of the second light-shielding film 312 is 1.45 mm. This allows the first light-shielding film 311 and the second light-shielding film 312 to cooperate with each other to block stray light from different propagation angles and directions, thereby achieving the blocking and absorption of stray light without affecting the propagation of normal light.

[0133] In one embodiment of this application, the ratio of the height of the first light-shielding film 311 to the height of the light-transforming element 30 ranges from 0.4726 to 0.6300. It should be understood that 0.4726 to 0.6300 includes the extreme values ​​of 0.4726 and 0.6300. In a specific example of this application, the height of the first light-shielding film is 1.98 mm, the height of the light-transforming element is 4.1 mm, and the ratio of the height of the first light-shielding film 311 to the height of the light-transforming element 30 is 0.4829.

[0134] In this application, when the first light-shielding film 311 has a "U"-shaped structure with an opening, the first light-shielding film 311 has a structure located on the side of the opening and a structure located at the bottom of the opening. The height of the first light-shielding film 311 mentioned in this application refers to the height of the structure located at the bottom of the opening.

[0135] Furthermore, in this embodiment, a certain height margin is provided for the first light-shielding film 311 so that the first light-shielding film 311 can still block the light path of stray light when the stray light reaches its limit. In a specific embodiment of this application, the height range of the first light-shielding film 311 is 1.908 mm to 2.371 mm, wherein the height margin of the first light-shielding film 311 is 0.463 mm. It should be understood that 1.908 mm to 2.371 mm includes the extreme values ​​of 1.908 mm and 2.371 mm.

[0136] In step S23, as Figure 11 As shown, a fixture 40 is further provided. The fixture 40 includes a slot with an inclined surface. The first prism 34b is placed in the slot of the fixture 40 at an angle with the first light-emitting surface 344b facing upwards, and the first reflective surface 342b of the first prism 34b rests on the inclined surface of the slot. In this way, the first light-emitting surface 344b of the first prism 34b is exposed outside the slot of the fixture 40, so that the first light-emitting surface 344b serves as the first bonding surface 304 of the first prism 34b.

[0137] The second prism 35b is clamped at an angle with its second light-emitting surface 354b facing upwards and its second light-incident surface 351b facing downwards, and then moved above the first prism 34b. A suction nozzle or gripper can be used to clamp the second prism 35b. During clamping, the nozzle or gripper contacts a portion of the second prism 35b that does not conduct light, thus avoiding affecting the surface shape of the second prism 35b and consequently the light propagation path.

[0138] The gripper or nozzle is controlled to align the center of the second light-incident surface 351b of the second prism 35b with the center of the first light-incident surface 344b of the first prism 34b, using the plane containing the first light-emitting surface 344b of the first prism 34b as a reference. In one embodiment of this application, the alignment accuracy between the centers of the first light-emitting surface 344b and the second light-incident surface 351b is ±25µm.

[0139] The gripper or suction nozzle is controlled to adjust the tilt of the second light-incident surface 351b of the second prism 35b relative to the first light-incident surface 344b, using the plane containing the first light-emitting surface 344b of the first prism 34b as a reference, so that the second light-incident surface 351b and the first light-incident surface 344b are as parallel as possible. In one embodiment of this application, the accuracy range of the tilt of the first light-incident surface 344b and the second light-incident surface 351b is less than 5 μm.

[0140] The gripper or suction nozzle is controlled to adjust the rotation of the second light-incident surface 351b of the second prism 35b relative to the first light-incident surface 344b, using the plane containing the first light-emitting surface 344b of the first prism 34b as a reference, so that the corners and sides of the second light-incident surface 351b are aligned with the corners and sides of the first light-incident surface 344b. In one embodiment of this application, the accuracy range of the rotation of the first light-incident surface 344b and the second light-incident surface 351b is ±25µm.

[0141] It should be understood that the aforementioned accuracy range can also be referred to as the assembly tolerance range of the first prism 34b and the second prism 35b that is acceptable to the optical system.

[0142] In one embodiment of this application, step S24 can be performed before or after step S23. Specifically, the relative position of the second prism 35b can be adjusted first, using the first prism 34b as a reference, to align the first prism 34b and the second prism 35b. Then, a first adhesive medium 321 is applied to the first adhesive surface 304 or the second adhesive surface 305. Next, the first prism 34b and the second prism 35b are bonded together using the first adhesive medium 321. Finally, the first adhesive medium 321 is cured to hold the first prism 34b and the second prism 35b in the calibrated position to form a prism semi-finished product.

[0143] In another embodiment of this application, a first adhesive medium 321 is first provided on the first adhesive surface 304 or the second adhesive surface 305; then the relative position of the second prism 35b is adjusted with the first prism 34b as a reference; next, the first prism 34b and the second prism 35b are bonded together by the first adhesive medium 321; finally, the first adhesive medium 321 is cured to keep the first prism 34b and the second prism 35b in the calibrated position to form a prism semi-finished product.

[0144] In another embodiment of this application, a first adhesive medium 321 is first provided between the first adhesive surface 304 and the second adhesive surface 305 to pre-fix the first prism 34b and the second prism 35b through the first adhesive medium 321; then the position of the second prism 35b is adjusted with the first prism 34b as a reference; finally, the first adhesive medium 321 is cured to keep the first prism 34b and the second prism 35b in the calibrated position to form a prism semi-finished product.

[0145] Step S24 can refer to step S14, wherein the first adhesive medium 321 can be thermosetting adhesive, UV adhesive, UV thermosetting adhesive or other adhesive materials.

[0146] It is worth mentioning that during the process of fixing the first prism 34b and the second prism 35b together through the first adhesive medium 321, air bubbles should be avoided from forming in the first adhesive medium 321, so as to prevent light from generating new stray light when passing through the air bubbles, which would affect the imaging effect.

[0147] In step S25, continue to refer to Figure 11 The third prism 36b is clamped at an angle with its third incident light surface 361b facing downwards, and then moved above the prism semi-finished product. A suction nozzle or gripper can be used to clamp the third prism 36b. During clamping, the suction nozzle or gripper contacts a portion of the third prism 36b that does not conduct light, thus avoiding affecting the surface shape of the third prism 36b and consequently the light propagation path.

[0148] Control the gripper or suction nozzle, using the plane containing the second light-emitting surface 354b as a reference, and adjust the center of the third light-incident surface 361b of the third prism 36b to align with the center of the second light-emitting surface 354b. In one embodiment of this application, the alignment accuracy between the centers of the second light-emitting surface 354b and the third light-incident surface 361b is ±25µm.

[0149] The gripper or suction nozzle is controlled to adjust the tilt of the third incident surface 361b of the third prism 36b relative to the second incident surface 354b, using the plane containing the second light-emitting surface 354b as a reference, so that the third incident surface 361b and the second incident surface 354b are as parallel as possible. In one embodiment of this application, the accuracy range of the tilt of the second incident surface 354b and the third incident surface 361b is less than 5 μm.

[0150] Controlling the gripper or suction nozzle, with the plane containing the second light-emitting surface 354b as a reference, adjust the rotation of the third light-incident surface 361b of the third prism 36b relative to the second light-emitting surface 354b, so that the corners and sides of the third light-incident surface 361b are aligned with the corners and sides of the second light-emitting surface 354b. In one embodiment of this application, the accuracy range of the rotation of the second light-emitting surface 354b and the third light-incident surface 361b is ±25µm.

[0151] In this application, the second prism 35b is assembled with the first prism 34b as a reference, so that the second prism 35b and the first prism 34b are aligned with each other. Then, the third prism 36b is assembled with the second prism 35b as a reference, so that the third prism 36b and the second prism 35b are aligned, thereby achieving alignment of the first prism 34b, the second prism 35b, and the third prism 36b. In this way, the light-shifting element 30 assembled with the first prism 34b, the second prism 35b, and the third prism 36b can have better optical performance in the optical system.

[0152] Of course, if the first prism 34b and the second prism 35b deviate during the alignment process, the third prism 36b can be adjusted so that the light-converting element 30 composed of the first prism 34b, the second prism 35b and the third prism 36b has better optical performance in the optical system.

[0153] In one embodiment of this application, step S26 can be performed before or after step S25. That is, the relative position of the third prism 36b can be adjusted first, using the prism semi-finished product as a reference, so that the third prism 36b is aligned with the prism semi-finished product; then, a second adhesive medium 322 is provided on the third adhesive surface 306 or the fourth adhesive surface 307, and the third prism 36b and the prism semi-finished product are bonded together by the second adhesive medium 322; finally, the second adhesive medium 322 is cured to keep the third prism 36b and the prism semi-finished product in the calibrated position to form the light-transforming element 30.

[0154] In another embodiment of this application, a second adhesive medium 322 is first provided on the third adhesive surface 306 or the fourth adhesive surface 307; then the relative position of the third prism 36b is adjusted with the prism semi-finished product as a reference; next, the third prism 36b and the prism semi-finished product are bonded together by the second adhesive medium 322; finally, the second adhesive medium 322 is cured to keep the third prism 36b and the prism semi-finished product in the calibrated position to form the light-transforming element 30.

[0155] In another embodiment of this application, a second adhesive medium 322 is first provided between the third adhesive surface 306 and the fourth adhesive surface 307 to pre-fix the third prism 36b and the prism semi-finished product through the second adhesive medium 322; then the position of the third prism 36b is adjusted with the prism semi-finished product as a reference; finally, the second adhesive medium 322 is cured to keep the third prism 36b and the prism semi-finished product in the calibrated position to form the light-converting element 30.

[0156] Step S26 can refer to step S14, wherein the second adhesive medium 322 can be thermosetting adhesive, UV adhesive, UV thermosetting adhesive or other adhesive materials.

[0157] It is worth mentioning that during the process of fixing the second prism 35b and the third prism 36b together using the second adhesive medium 322, air bubbles should be avoided from forming in the second adhesive medium 322, so as to prevent new stray light from being generated when light passes through the air bubbles, which would affect the imaging effect.

[0158] In one embodiment of this application, during the process of assembling the first prism 34b, the second prism 35b, and the third prism 36b into a light-shifting element 30, the relative position of the second prism 35b can be adjusted firstly with the first prism 34b as a reference; then, a first adhesive medium 321 is provided on the first bonding surface 304, and the first prism 34b and the second prism 35b are bonded together using the first adhesive medium 321; next, the first adhesive medium 321 is cured to hold the first prism 34b and the second prism 35b in the calibrated position to form a prism semi-finished product; then, the relative position of the third prism 36b is adjusted based on the prism semi-finished product; next, a second adhesive medium 322 is provided on the third bonding surface 306, and the prism semi-finished product is bonded together using the second adhesive medium 322; finally, the second adhesive medium 322 is cured to hold the third prism 36b and the prism semi-finished product in the calibrated position to form the light-shifting element 30.

[0159] In another embodiment of this application, during the process of assembling the first prism 34b, the second prism 35b, and the third prism 36b into the light-converting element 30, a first adhesive medium 321 can be first applied to the first bonding surface 304; then, the relative position of the second prism 35b can be adjusted with the first prism 34b as a reference; next, the first prism 34b and the second prism 35b can be bonded together using the first adhesive medium 321; then, the first adhesive medium 321 can be cured to hold the first prism 34b and the second prism 35b in the calibrated position to form a prism semi-finished product; next, a second adhesive medium 322 can be applied to the third bonding surface 306; then, the relative position of the third prism 36b can be adjusted with the prism semi-finished product as a reference; next, the prism semi-finished product and the third prism 36b can be bonded together using the second adhesive medium 322; finally, the second adhesive medium 322 can be cured to hold the third prism 36b and the prism semi-finished product in the calibrated position to form the light-converting element 30.

[0160] In one embodiment of this application, a manufacturing process for a split-type optical switching element 30 is also provided, which includes the following steps:

[0161] S31: A plate-shaped prism blank is provided, and the upper and lower surfaces of the prism blank are ground to reduce the roughness of the upper and lower surfaces of the prism blank. The upper surface of the prism blank corresponds to the upper surface 301 of the optical deflection element 30, and the lower surface 303 of the prism blank corresponds to the lower surface 303 of the optical deflection element 30.

[0162] S32: Use a laser cutting machine to cut the prism blank along its length to form a semi-finished product of three long strip prisms.

[0163] S33: The surfaces of the three elongated prisms are processed by single-sided grinding to form a first elongated prism strip, a second elongated prism, and a third elongated prism. The cross-section of the first elongated prism is a first trapezoidal shape, the cross-section of the second elongated prism is a rectangular shape, and the cross-section of the third elongated prism is a second trapezoidal shape. The first and third elongated prisms have an asymmetrical structure. The upper surfaces of the first, second, and third elongated prisms correspond to the upper surface 301 of the light-converting element 30, and the lower surfaces correspond to the lower surface 303 of the light-converting element 30. The inclined side surfaces of the first and third elongated prisms correspond to the two side surfaces 302 of the light-converting element 30. The cut surfaces of the first, second, and third elongated prisms are used as the bonding surfaces for bonding the three prisms together.

[0164] Furthermore, in step S33, the edges of the first and third elongated prisms are ground to remove the edges and corners between the upper surface and the inclined side surface of the first and third elongated prisms, so that the upper surface and the inclined side surface are connected by a plane or arc surface, thus avoiding the prism from being easily broken due to the presence of edges and corners.

[0165] S34: Coating the surfaces of the first, second, and third elongated prisms that require light reflection. Specifically, coating is applied to the upper surface, the inclined side surface, the upper surface of the second, and the upper and inclined side surfaces of the third elongated prisms, so that light can undergo multiple reflections on multiple surfaces when passing through the light-reflecting element 30.

[0166] S35: A light-shielding film 31 is provided on the adhesive surface between the first and second elongated prisms, and on the adhesive surface between the second and third elongated prisms. In one embodiment of this application, a deposition etching process is used to set the light-shielding film 31 to precisely control its thickness to within 1 μm. In another embodiment of this application, an ink screen printing method is used to set the light-shielding film 31; however, ink screen printing can cause significant fluctuations in the thickness of the light-shielding film 31, which may lead to air bubbles at the adhesive bonding sites.

[0167] S36: Cut the first elongated prism, the second elongated prism, and the third elongated prism along a direction perpendicular to their length to form multiple block-shaped first prism 34b, second prism 35b, and third prism 36b.

[0168] S37: Silkscreen printing is applied to the upper surfaces of the first prism 34b and the third prism 36b to allow effective light to enter the prism while stray light is intercepted. It should be understood that the upper surface of the first prism 34b corresponds to the light-incident area 3011 of the upper surface of the light-deflecting element 30, and the upper surface of the third prism 36b corresponds to the light-outceasing area 3013 of the upper surface of the light-deflecting element 30. Therefore, applying silkscreen printing to the upper surfaces of the first prism 34b and the third prism 36b can better intercept stray light.

[0169] S38: Assemble the first prism 34b, the second prism 35b and the third prism 36b according to the steps of S11 to S14 or S21 to S26 above to form the light-converting element 30.

[0170] In another embodiment of this application, after step S35, the first, second, and third elongated prisms are bonded and fixed according to steps S11 to S14 or S21 to S26 to form a semi-finished product of an elongated light-converting element.

[0171] Then, the long strip-shaped light-converting element semi-finished product is cut along a direction perpendicular to its length to form multiple block-shaped light-converting elements 30.

[0172] Finally, a silkscreen is provided on the upper surface 301 of the light-converting element 30 so that effective light can enter the interior of the prism while stray light can be blocked.

[0173] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A manufacturing process for an optical switching element used in a telephoto optical system, characterized in that, include: At least two prisms are provided, the at least two prisms having a first adhesive surface and a second adhesive surface for bonding with each other, the at least two prisms including a first prism, a second prism and a third prism, wherein the first prism and the second prism have a first adhesive surface and a second adhesive surface for bonding with each other, and the second prism and the third prism have a third adhesive surface and a fourth adhesive surface for bonding with each other. At least one light-shielding film is provided, the at least one light-shielding film being disposed on the first adhesive surface or the second adhesive surface, the at least one light-shielding film including a first light-shielding film and a second light-shielding film, the first light-shielding film being disposed on the first adhesive surface or the second adhesive surface, and the second light-shielding film being disposed on the third adhesive surface or the fourth adhesive surface, both the first light-shielding film and the second light-shielding film extending from the lower surface of the light-transforming element along the height direction toward the upper surface of the light-transforming element, the first light-shielding film and the second light-shielding film being located on the same side of the centerline of the lower surface of the light-transforming element; Calibrate the relative positions of the at least two prisms; An adhesive medium is provided between the first adhesive surface and the second adhesive surface of the at least two prisms; and The adhesive medium is cured to hold the at least two prisms in the calibrated relative positions to form the light-deflecting element.

2. The manufacturing process according to claim 1, characterized in that, The first prism includes a first light-incident surface, a first light-exiting surface, and a first reflective surface. The second prism includes a second light-incident surface, a second reflective surface, and a second light-exiting surface. The first light-exiting surface is the first bonding surface for bonding the first prism and the second prism together, and the second light-incident surface is the second bonding surface for bonding the first prism and the second prism together.

3. The manufacturing process according to claim 2, characterized in that, The first light-shielding film is disposed on the first light-emitting surface of the first prism. The first light-shielding film has a "U"-shaped structure with an opening facing the first light-incident surface.

4. The manufacturing process according to claim 2, characterized in that, The at least one light-shielding film includes a first light-shielding film disposed on the second light-incident surface of the second prism. The first light-shielding film has a "U"-shaped structure with an opening facing the second light-outcrystal surface.

5. The manufacturing process according to any one of claims 3 or 4, characterized in that, The adhesive medium includes a first adhesive medium, which is disposed together with the first light-shielding film on the first bonding surface of the first prism or the second bonding surface of the second prism, wherein the first adhesive medium covers the first light-shielding film.

6. The manufacturing process according to claim 5, characterized in that, Adjust the center of the first light-emitting surface of the first prism to align with the center of the second light-incident surface of the second prism, wherein the accuracy range of the alignment between the centers of the first light-emitting surface and the second light-incident surface is ±25µm.

7. The manufacturing process according to claim 5, characterized in that, Adjust the tilt between the first light-emitting surface of the first prism and the second light-incident surface of the second prism, wherein the precision range of the tilt between the first light-emitting surface and the second light-incident surface is less than 5 μm.

8. The manufacturing process according to claim 5, characterized in that, Adjust the degree of rotation between the first light-emitting surface of the first prism and the second light-incident surface of the second prism, wherein the accuracy range of the degree of rotation between the first light-emitting surface and the second light-incident surface is ±25µm.

9. The manufacturing process according to any one of claims 6 to 8, characterized in that, First, adjust the relative positions of the first prism and the second prism. Then, place the first adhesive medium on the first adhesive surface or the second adhesive surface. Next, bond the first adhesive surface and the second adhesive surface together using the first adhesive medium. Finally, cure the first adhesive medium to keep the first prism and the second prism in the relative positions determined by calibration to form an optical deflection element.

10. The manufacturing process according to any one of claims 6 to 8, characterized in that, First, the first adhesive medium is placed on the first adhesive surface or the second adhesive surface. Then, the relative positions of the first prism and the second prism are adjusted. Next, the first adhesive surface and the second adhesive surface are bonded together through the first adhesive medium. Finally, the first adhesive medium is cured to keep the first prism and the second prism in the relative positions determined by calibration to form an optical deflection element.

11. The manufacturing process according to any one of claims 6 to 8, characterized in that, First, the first adhesive medium is placed between the first adhesive surface and the second adhesive surface. The first prism and the second prism are pre-fixed by the first adhesive medium. Then, the relative positions of the first prism and the second prism are adjusted. Finally, the first adhesive medium is cured to keep the first prism and the second prism in the relative positions determined by calibration to form a light-transforming element.

12. The manufacturing process according to claim 1, characterized in that, It also includes the following steps: Using the first prism as a reference, calibrate the relative position of the second prism; A first adhesive medium is provided between the first adhesive surface and the second adhesive surface, and the first adhesive medium is cured to hold the first prism and the second prism in the position determined by calibration to form a prism semi-finished product; Using the semi-finished prism as a reference, calibrate the relative position of the third prism; A second adhesive medium is disposed between the third adhesive surface and the fourth adhesive surface, and the second adhesive medium is cured to hold the prism semi-finished product and the third prism in the calibrated determined position to form the light-converting element.

13. The manufacturing process according to claim 12, characterized in that, The first prism includes a first light-incident surface, a first light-exiting surface, and a first reflective surface; the second prism includes a second light-incident surface, a second reflective surface, and a second light-exiting surface; and the third prism includes a third light-incident surface, a third reflective surface, and a third light-exiting surface. The first light-exiting surface is the first bonding surface used to bond the first prism and the second prism together; the second light-incident surface is the second bonding surface used to bond the first prism and the second prism together; the second light-exiting surface is the third bonding surface used to bond the second prism and the third prism together; and the third light-incident surface is the fourth bonding surface used to bond the second prism and the third prism together.

14. The manufacturing process according to claim 13, characterized in that, The first light-shielding film and the second light-shielding film have a "U"-shaped structure with openings, and the openings of the first light-shielding film and the second light-shielding film have the same direction.

15. The manufacturing process according to claim 14, characterized in that, The first light-shielding film and the second light-shielding film are parallel to each other within the light-transforming element, and the height of the first light-shielding film is different from the height of the second light-shielding film.

16. The manufacturing process according to claim 15, characterized in that, The first light-shielding film and the second light-shielding film are disposed adjacent to each other within the light-transforming element, and the distance between the first light-shielding film and the second light-shielding film ranges from 1.4 mm to 1.8 mm.

17. The manufacturing process according to any one of claims 12 to 16, characterized in that, First, the relative position of the second prism is adjusted using the first prism as a reference. Then, the first adhesive medium is applied to the first bonding surface, and the first prism and the second prism are bonded together using the first adhesive medium. Next, the first adhesive medium is cured, and the first prism and the second prism are held in the calibrated position to form a prism semi-finished product. Then, the relative position of the third prism is adjusted using the prism semi-finished product as a reference. Next, the second adhesive medium is applied to the third bonding surface, and the prism semi-finished product and the third prism are bonded together using the second adhesive medium. Finally, the second adhesive medium is cured, and the third prism and the prism semi-finished product are held in the calibrated position to form the light-shifting element.

18. The manufacturing process according to any one of claims 12 to 16, characterized in that, First, the first adhesive medium is applied to the first bonding surface; then, the relative position of the second prism is adjusted with the first prism as a reference; next, the first prism and the second prism are bonded together using the first adhesive medium; then, the first adhesive medium is cured to hold the first prism and the second prism in the calibrated position to form a prism semi-finished product; next, the second adhesive medium is applied to the third bonding surface; then, the relative position of the third prism is adjusted with the prism semi-finished product as a reference; next, the prism semi-finished product and the third prism are bonded together using the second adhesive medium; finally, the second adhesive medium is cured to hold the third prism and the prism semi-finished product in the calibrated position to form the light-shifting element.

19. A light-shifting element used in a telephoto optical system, characterized in that, include: At least two prisms, the at least two prisms having a first adhesive surface and a second adhesive surface for bonding with each other, the at least two prisms including a first prism, a second prism and a third prism, wherein the first prism and the second prism have a first adhesive surface and a second adhesive surface for bonding with each other, and the second prism and the third prism have a third adhesive surface and a fourth adhesive surface for bonding with each other. At least one light-shielding film is disposed on the first adhesive surface or the second adhesive surface. The at least one light-shielding film includes a first light-shielding film and a second light-shielding film. The first light-shielding film is disposed on the first adhesive surface or the second adhesive surface, and the second light-shielding film is disposed on the third adhesive surface or the fourth adhesive surface. Both the first light-shielding film and the second light-shielding film extend from the lower surface of the light-transforming element toward the upper surface of the light-transforming element along the height direction. The first light-shielding film and the second light-shielding film are located on the same side of the centerline of the lower surface of the light-transforming element. An adhesive medium is disposed between the first adhesive surface and the second adhesive surface of the at least two prisms, and the adhesive medium covers the at least one light-shielding film.

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