Periscopic zoom motor with low stray light

Abstract

The invention relates to a periscopic zoom motor with low stray light. The periscopic zoom motor comprises a shell, a hollow cavity is formed in the shell; a reflection assembly and a lens assembly are movably arranged in the hollow cavity; the shell is provided with a light inlet opposite to the incident plane of the prism; a first anti-reflection layer is arranged in the circumferential direction of one end surface, deviating from the incident surface, of the light inlet; a diaphragm is arranged in the circumferential direction of the emergent surface of the prism; the inner edge of the diaphragm is wave-shaped; a second anti-reflection layer is arranged on the inner side of the bottom surface of the hollow cavity; the lens assembly comprises a lens bracket and at least one lens arranged in the lens bracket; a hollow area is arranged on the lens support and located on the light emitting side of the lens. The first anti-reflection layer can effectively reduce stray light formed by reflection of light entering from the light inlet on the inner wall of the cavity, the second anti-reflection layer can absorb stray light leaked or reflected from the lens assembly, stray light interference caused by diffraction is reduced by the wavy inner edge, a clear channel is provided for the stray light by the hollowed-out area, and the anti-reflection effect of the lens assembly is improved. And the stray light can be directionally processed.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging, and in particular to a periscope zoom motor with low stray light. Background Art

[0002] With the popularization of mobile electronic devices, the relevant technologies of camera modules applied to mobile electronic devices for helping users to obtain images have been rapidly developed and advanced.

[0003] A periscope camera module is a camera module that uses a reflective component to fold the light path so that it can be placed in a thin electronic device. The periscope camera module usually has a long focal length and can clearly capture distant scenes. The periscope camera module generally includes a reflective component, a lens component, and an imaging component that are arranged in sequence. The reflective component is used to change the direction of the light path, and the lens component is used to converge the light and finally realize imaging on the imaging component. Since the periscope camera module has a movable lens component, there will be a gap between the reflective component and the lens component. After a small part of the light passes through the reflective component, it does not directly enter the lens component, but is emitted from the gap between the reflective component and the lens component to the surrounding components, and then enters the lens component after unnecessary reflection in the camera module, resulting in stray light in the final imaging.

[0004] On the other hand, there is also a gap between the lens assembly and the imaging assembly. After passing through the lens assembly, some light does not directly enter the imaging assembly, but is emitted from the gap between the lens assembly and the imaging assembly to the surrounding components, such as the bottom surface of the base, and then enters the imaging assembly after unnecessary reflection in the camera module, resulting in stray light in the final imaging. Figure 1 As shown, it is a schematic diagram of the stray light pattern of the periscope zoom motor in the prior art. After entering the lens assembly, the stray light does not directly enter the imaging assembly located behind the lens assembly, but enters the imaging assembly after further reflection through the bottom surface of the base, thereby reducing the imaging quality. Summary of the invention

[0005] In order to solve the above problems in the prior art, the present invention provides a periscope zoom motor with low stray light.

[0006] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0007] A periscope zoom motor with low stray light comprises a shell; a hollow chamber is formed in the shell; a reflective assembly and a lens assembly are movably arranged in the hollow chamber; light enters the lens assembly after being reflected by the reflective assembly; a light inlet is arranged on the shell opposite to the incident surface of a prism; a first anti-reflection layer is arranged in the circumferential direction of an end surface of the light inlet facing away from the incident surface; an aperture is arranged in the circumferential direction of the exit surface of the prism; the inner edge of the aperture is wavy; a second anti-reflection layer is arranged on the inner side of the bottom surface of the hollow chamber; the lens assembly comprises a lens holder and at least one lens arranged therein; a hollow area is arranged on the lens holder at the light exit side of the lens to allow stray light to pass through the hollow area and project to the second anti-reflection layer; a light shielding unit is formed on the light exit side of the lens assembly by extending inwardly for a distance from the inner side of the shell; a light exit is formed in the middle of the light shielding unit; the cross section of the light exit perpendicular to the optical axis gradually increases along the optical axis.

[0008] In one embodiment of the present invention, the prism includes a reflection surface opposite to the incident surface and an exit surface arranged perpendicular to the incident surface, and two side surfaces simultaneously connected to the incident surface, the reflection surface, and the exit surface; a total reflection film layer is provided on the reflection surface; an anti-reflection film layer is provided on the exit surface; and a black-plated layer is provided on the side surfaces.

[0009] In one embodiment of the present invention, the second anti-reflection layer is arranged relative to the lens assembly; the size of the second anti-reflection layer in the first direction is larger than the lens assembly; the second anti-reflection layer is any one of a black Mylar layer, a black spray layer, and an electrophoretic black layer.

[0010] In one embodiment of the present invention, the waveform of the wavy shape is a triangle, a trapezoid or an arc.

[0011] In one embodiment of the present invention, the wavy shape is a smooth curve of a sine wave.

[0012] In one embodiment of the present invention, a limit block extending along the optical axis is provided on the side of the lens holder away from the reflective assembly; the limit blocks are arranged one on each side of the lens along the third direction; and a hollow area is formed between the limit blocks to allow stray light to enter the second anti-reflection layer through the hollow area.

[0013] In one embodiment of the present invention, a plurality of recessed portions are provided on a side of the lens holder facing away from the bottom surface of the hollow chamber; a side of the lens holder close to the reflective component is provided with a yielding portion relatively arranged along a second direction to allow stray light to enter between the recessed portion and the shell and / or between the second anti-reflective layer and the lens holder, thereby reducing or eliminating the outgoing light of the reflective component from being reflected into the lens.

[0014] In one embodiment of the present invention, the distance between the inner walls of the two limiting blocks in the third direction tends to increase along the first direction.

[0015] In one embodiment of the present invention, the shell includes a base and an outer shell; the outer shell is mounted on the base; the light inlet is arranged on the outer shell; the inner side of the outer shell is provided with a black-plated layer; the base is made of black plastic; a metal sheet is embedded on the base relative to the second anti-reflection layer.

[0016] In one embodiment of the present invention, the angle between the light emitting surface of the light emitting port and the first direction is θ, 30°≤θ≤90°; and the roughness of the light emitting surface is Ra>0.4 um.

[0017] The beneficial effects of the present invention are as follows: the first anti-reflection layer can effectively reduce the stray light formed by the reflection of the light entering from the light inlet on the inner wall of the chamber, improve the light utilization efficiency, and enhance the imaging quality; the second anti-reflection layer can absorb the stray light leaked or reflected from the lens assembly, and avoid the stray light from being reflected multiple times in the chamber to affect the imaging effect; the wavy inner edge can disperse the diffraction energy to a wider spatial frequency range, and reduce the local interference intensity. Reduce the stray light interference caused by diffraction, thereby suppressing the triggering conditions of polarization plane rotation (i.e., optical rotation effect). A hollow area is formed between the limit blocks, which provides a clear channel for stray light, guides the stray light emitted from the lens through the hollow area to the second anti-reflection layer, so that the stray light can be processed in a direction, and reduce the possibility of interference caused by reflection in other parts; the yielding part allows stray light to enter between the inner concave part and the shell and / or between the second anti-reflection layer and the lens bracket, providing more scattering and absorption paths for stray light; the angle design of the light outlet relatively reduces the possibility of light directly reflecting back into the optical system, thereby reducing the interference of stray light on imaging and improving the contrast and clarity of the image. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 is a schematic diagram of a stray light pattern of a periscope zoom motor in the prior art;

[0020] Figure 2 It is an exploded view of the structure of the present invention;

[0021] Figure 3 is a schematic diagram of the prism structure of the present invention;

[0022] Figure 4 Schematic diagram of the aperture structure of the present invention;

[0023] Figure 5 It is a schematic diagram of the internal structure of the periscope zoom motor of the present invention;

[0024] Figure 6 is a top view of the periscope zoom motor of the present invention;

[0025] Figure 7 The present invention Figure 6 Middle AA section;

[0026] Figure 8 It is a schematic diagram of the light outlet structure of the present invention;

[0027] Description of reference numerals:

[0028] 100, shell; 101, hollow chamber; 102, bottom surface; 103, second anti-reflection layer; 104, shading unit; 105, light outlet; 106, light outlet surface; 110, base; 120, shell; 121, light inlet; 122, first anti-reflection layer; 200, reflection component; 210, prism; 211, incident surface; 212, reflection surface; 213, exit surface; 2131, aperture; 214, side; 300, lens component; 310, lens holder; 311, hollow area; 312, limit block; 313, inner wall; 314, give way portion; 315, recessed portion; 320, lens. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] like Figure 2 As shown, the first direction is the same as the optical axis direction, which refers to the X-axis direction, the second direction (Y-axis direction) refers to the direction perpendicular to the optical axis direction (X-axis direction), and the third direction (Z-axis direction) refers to the direction perpendicular to both the optical axis direction (X-axis direction) and the second direction (Y-axis direction). These definitions are for illustrative purposes only and do not limit the scope of the claims. The directions described above and shown in the drawings are examples and may of course be different based on implementation and use.

[0033] like Figure 2 As shown, a periscope zoom motor with low stray light includes a housing 100; a hollow chamber 101 is formed in the housing 100; a reflective assembly 200 and a lens assembly 300 are movably arranged in the hollow chamber 101; light enters the lens assembly 300 after being reflected by the reflective assembly 200; a light inlet 121 is arranged on the housing 100 and is arranged opposite to an incident surface 211 of a prism 210; the reflective assembly 200 is used to install the prism 210 and drive the prism 210 to move in different directions under the drive of a first driving mechanism. movement; the lens assembly 300 is used to install at least one lens 320 and drive the lens 320 to move along the optical axis direction of the lens 320 under the drive of the second driving mechanism; the first driving mechanism drives the prism 210 to rotate along the first direction and / or the third direction, or rotate along the second direction and / or the third direction; the first driving mechanism may include a driving structure composed of several magnets and coils, which is a common structure in the field and is not described in detail here; similarly, the second driving structure may also be a driving structure composed of several magnets and coils.

[0034] In one embodiment, a first anti-reflection layer 122 is provided in the circumferential direction of one end surface of the light inlet 121 away from the incident surface 211, which can effectively reduce stray light formed by reflection of the light entering from the light inlet 121 on the inner wall 313 of the chamber, improve light utilization efficiency, and enhance imaging quality; in one embodiment, the first anti-reflection layer 122 can be a black spray paint layer, an electrophoretic black plating layer, or a black Mylar layer;

[0035] In one embodiment, a stop 2131 is provided around the exit surface 213 of the prism 210; the inner edge of the stop 2131 is wavy;

[0036] In one embodiment, a second anti-reflection layer 103 is disposed inside the bottom surface 102 of the hollow chamber 101 to absorb stray light leaking out or reflected from the lens assembly 300, thereby preventing stray light from being reflected multiple times in the chamber and affecting the imaging effect;

[0037] In one embodiment, the lens assembly 300 includes a lens holder 310 and at least one lens 320 disposed therein; a hollow area 311 is provided on the lens holder 310 at the light-emitting side of the lens 320 to allow stray light to pass through the hollow area 311 toward the second anti-reflection layer 103; a specific path is provided for the stray light so that it can be effectively absorbed, thereby reducing interference with imaging.

[0038] In one embodiment, the inner side of the housing 100 extends inward for a distance to form a light shielding unit 104 located on the light exit side of the lens assembly 300; a light exit port 105 is formed in the middle of the light shielding unit 104; the cross section of the light exit port 105 perpendicular to the optical axis direction gradually increases along the optical axis direction. This structure can prevent the edge of the light exit port 105 from reflecting light, avoid the reflected light from forming stray light, and also help prevent stray light from reflecting into the imaging assembly set at the rear end of the lens assembly 300, thereby ensuring the purity of the emitted light and improving the imaging quality.

[0039] like Figure 3-4As shown, in one embodiment, the prism 210 includes a reflection surface 212 opposite to the incident surface 211 and an exit surface 213 arranged perpendicular to the incident surface 211, and two side surfaces 214 connected to the incident surface 211, the reflection surface 212, and the exit surface 213; the reflection surface 212 is provided with a total reflection film layer, which can make the light totally reflected in the prism 210, and reflect the light efficiently toward the exit surface 213, reduce the energy loss of the light in the reflection process, improve the utilization rate of the light, ensure that sufficient light intensity enters the lens assembly 300, and help to improve the brightness and clarity of the image; the exit surface 213 is provided with a total reflection film layer The anti-reflection film layer, the anti-reflection film layer on the exit surface 213 can reduce the reflection of light when it is emitted from the prism 210, so that the light can be emitted from the prism 210 more smoothly and enter the lens assembly 300, thereby reducing the reflectivity of the emitted light, thereby reducing the generation of stray light and improving the contrast and image quality of the imaging; the side 214 is provided with a black plating layer, and the black plating layer is provided on the two side surfaces 214, which can absorb the light that may leak or reflect from the side 214, and prevent these lights from forming stray light inside the periscope zoom motor, thereby playing the role of shading and extinction, further improving the stray light suppression capability of the optical system, and helping to obtain a purer and clearer imaging effect.

[0040] In one embodiment, the second anti-reflection layer 103 is arranged relative to the lens assembly 300; the size of the second anti-reflection layer 103 in the first direction is larger than that of the lens assembly 300, and can receive and absorb stray light leaked or reflected from the lens assembly 300 in a larger area, and prevent the stray light from reflecting everywhere in the hollow chamber 101, thereby improving the suppression effect of stray light and improving the imaging quality; the second anti-reflection layer 103 is any one of a black Mylar layer, a black spray layer, and an electrophoretic black layer. Whether it is a black Mylar layer, a black spray layer or an electrophoretic black layer, they all have good light absorption performance. The black Mylar layer has good flexibility and insulation, and can play a certain isolation and protection role while absorbing stray light; the black spray layer can be evenly covered on the bottom surface 102 of the chamber, has a good light absorption effect, and has a relatively low cost; the electrophoretic black layer has high hardness and corrosion resistance, and can play a role in absorbing stray light for a long time and stably, ensuring the optical performance of the periscope zoom motor in different environments.

[0041] In one embodiment, the waveform of the wavy shape is a triangle, a trapezoid or an arc.

[0042] In one embodiment, the wavy shape is a smooth sinusoidal curve.

[0043] Optical rotation refers to the phenomenon that the vibration plane of linearly polarized light rotates when passing through certain substances, which is mainly caused by the chiral structure inside the material or the asymmetric reflection / refraction in the optical path. In the periscope prism system, multiple reflections may cause polarization state changes or stray light interference, thereby causing imaging distortion similar to optical rotation. Aperture 2131 can filter out stray light that deviates from the main optical path by limiting the aperture and shape of the beam, reducing the optical rotation effect caused by polarization state confusion or optical path scattering.

[0044] The traditional linear edge aperture 2131 may produce regular diffraction fringes due to the sharp boundary, while the wavy inner edge can disperse the diffraction energy into a wider spatial frequency range and reduce the local interference intensity. The stray light interference caused by diffraction is reduced, thereby suppressing the triggering conditions of polarization plane rotation (i.e., optical rotation effect). The wavy aperture 2131 is located in the circumference of the exit surface 213 (non-imaging area), and the edge stray light is physically shielded by the periodic undulating structure. Its waveform design can guide the light that deviates from the main optical path to scatter or reflect, reducing the invalid light entering the imaging area; the inner edge of the wavy aperture 2131 can effectively block the non-imaging light beam (such as ghosting and glare) generated by the reflection or refraction of the surface of the prism 210. The wavy aperture 2131 significantly reduces the interference of high-brightness light sources by dispersing the stray light path; by blocking stray light, the aperture 2131 reduces background noise and makes the imaging subject clearer; in the backlight or strong light source scene, the wavy aperture 2131 disperses and absorbs abnormal reflected light to avoid color shift caused by halo and polarization plane rotation; the cooperation between the aperture 2131 and the prism 210 can reduce the optical path difference caused by multiple reflections and reduce the influence of optical path distortion on the polarization state;

[0045] In one embodiment, the wavy edge of the aperture 2131 can absorb stray light in a specific polarization direction by coating it with a light-absorbing material, thereby reducing the impact of abnormal changes in the polarization state on imaging; the aperture 2131 usually uses a black light-absorbing material (such as a carbon black coating) with high absorbance and high temperature resistance to adapt to the long-term working environment of the prism 210.

[0046] In one embodiment, a stopper 312 extending along the optical axis is provided on one side of the lens holder 310 away from the reflective assembly 200; the stopper 312 is provided one on each side of the lens 320 along the third direction; a hollow area 311 is formed between the stopper 312 to allow stray light to enter the second anti-reflection layer 103 through the hollow area 311. The hollow area 311 formed between the stopper 312 provides a clear channel for stray light, guides stray light emitted from the lens 320 through the hollow area 311 to the second anti-reflection layer 103, enables stray light to be processed in a direction, reduces the possibility of interference caused by reflection in other parts, and helps to improve the imaging quality. The stopper 312 can also effectively limit the movement stroke of the lens assembly 300.

[0047] like Figure 5 As shown, in one embodiment, a plurality of recessed portions 315 are provided on the side of the lens holder 310 away from the bottom surface 102 of the hollow chamber 101; and a side of the lens holder 310 close to the reflective assembly 200 is provided with a yielding portion 314 arranged opposite to each other along the second direction, so as to allow stray light to enter between the recessed portion 315 and the housing 100 and / or between the second anti-reflection layer 103 and the lens holder 310, thereby reducing or eliminating the reflection of the outgoing light of the reflective assembly 200 into the lens 320. The presence of the recessed portion 315 increases the complexity of the surface of the lens holder 310, so that the stray light entering the recessed portion 315 gradually attenuates its energy after multiple reflections inside, thereby reducing the possibility of the stray light being reflected again and entering the lens 320. At the same time, the clearance portion 314 allows stray light to enter between the inner recess 315 and the housing 100 and / or between the second anti-reflection layer 103 and the lens holder 310, providing more scattering and absorption paths for stray light, further reducing the probability that the outgoing light of the reflective component 200 is reflected into the lens 320, thereby improving the imaging quality. The design of the clearance portion 314 changes the propagation path of stray light, avoids direct reflection of stray light between the reflective component 200 and the lens 320, makes the light propagation in the optical system more orderly, reduces the interference of stray light on normal imaging light, and helps to improve the clarity and contrast of the image. The design of the inner recess 315 and the clearance portion 314 effectively utilizes the space around the lens holder 310 to deal with stray light without increasing the overall structural size, thereby realizing a compact design of the optical structure.

[0048] In one embodiment, the distance between the inner walls 313 of the two limit blocks 312 in the third direction tends to increase along the first direction. This design allows the hollow area 311 to form a trumpet-like shape, with the opening direction facing the light outlet 105. As the light propagates along the first direction, stray light is guided to the second anti-reflection layer 103 on the one hand, and can be guided to the shading unit 104 by the inner wall 313 on the other hand, and the shading unit 104 can further guide the stray light to the second anti-reflection layer 103 or the inner side of the housing 120, thereby improving the efficiency of stray light collection and more effectively reducing the interference of stray light on imaging.

[0049] In one embodiment, the housing 100 includes a base 110 and a shell 120; the shell 120 is sleeved on the base 110; the light inlet 121 is arranged on the shell 120; the inner side of the shell 120 is provided with a black-plated layer; the base 110 is made of black plastic; and a metal sheet is embedded on the base 110 at a position opposite to the second anti-reflection layer 103. The black-plated layer is arranged on the inner side of the shell 120, which can effectively absorb the stray light entering the housing 100 and reduce the reflection of the stray light on the inner wall 313 of the housing 100. At the same time, the base 110 is made of black plastic material and also has a certain light absorption ability. Together with the black-plated layer, the absorption effect of stray light is further enhanced, which helps to improve the imaging quality.

[0050] like Figure 6-8 As shown, in one embodiment, the angle between the light emitting surface 106 of the light emitting port 105 and the first direction is θ, 30°≤θ≤90°; the roughness of the light emitting surface 106 is Ra>0.4um. A suitable light emitting angle can reduce the reflection of light at the light emitting port 105, and reduce the glare and stray light caused by reflection. When light is emitted at a larger angle, the possibility of light being directly reflected back into the optical system is relatively reduced, thereby reducing the interference of stray light on imaging and improving the contrast and clarity of the image. The rough light emitting surface 106 can effectively destroy the mirror reflection condition and reduce the possibility of mirror reflection generated by the light emitting surface 106. This helps to reduce the impact of reflected light on imaging, especially in complex lighting environments, and can reduce problems such as ghosting and flare caused by reflected light, thereby improving the quality and stability of imaging.

[0051] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A periscope zoom motor with low stray light, comprising a housing (100); a hollow chamber (101) is formed in the housing (100); a reflective assembly (200) and a lens assembly (300) are movably arranged in the hollow chamber (101); light enters the lens assembly (300) after being reflected by the reflective assembly (200); a light inlet (121) is arranged on the housing (100) and is arranged opposite to an incident surface (211) of a prism (210); the characteristics are: A first anti-reflection layer (122) is provided in the circumferential direction of one end surface of the light inlet (121) that is away from the incident surface (211); an aperture (2131) is provided in the circumferential direction of the exit surface (213) of the prism (210); the inner edge of the aperture (2131) is wavy; a second anti-reflection layer (103) is provided on the inner side of the bottom surface (102) of the hollow chamber (101); the lens assembly (300) comprises a lens holder (310) and at least one lens (320) arranged therein; A hollow area (311) is provided on the lens holder (310) at the light exit side of the lens (320) to allow stray light to pass through the hollow area (311) and project toward the second anti-reflection layer (103); a light shielding unit (104) is formed on the inner side of the housing (100) and extends inward for a distance and is located on the light exit side of the lens assembly (300); a light exit port (105) is formed in the middle of the light shielding unit (104); and the cross section of the light exit port (105) perpendicular to the optical axis direction gradually increases along the optical axis direction.

2. The low stray light periscope zoom motor according to claim 1, characterized in that: The prism (210) comprises a reflection surface (212) opposite to the incident surface (211), an exit surface (213) arranged perpendicular to the incident surface (211), and two side surfaces (214) connected to the incident surface (211), the reflection surface (212), and the exit surface (213); a total reflection film layer is provided on the reflection surface (212); an anti-reflection film layer is provided on the exit surface (213); and a black-plated layer is provided on the side surface (214).

3. The low stray light periscope zoom motor according to claim 1, characterized in that: The second anti-reflection layer (103) is arranged relative to the lens assembly (300); the size of the second anti-reflection layer (103) in the first direction is larger than the lens assembly (300); the second anti-reflection layer (103) is any one of a black Mylar layer, a black spray layer, and an electrophoretic black layer.

4. The low stray light periscope zoom motor according to claim 1, characterized in that: The waveform of the wavy shape is a triangle, a trapezoid or an arc.

5. The low stray light periscope zoom motor according to claim 1, characterized in that: The wavy shape is a smooth curve of a sine wave.

6. The low stray light periscope zoom motor according to claim 1, characterized in that: A stop block (312) extending along the optical axis direction is provided on one side of the lens holder (310) away from the reflective assembly (200); one of the stop blocks (312) is provided on each side of the lens (320) along a third direction; and a hollow area (311) is formed between the stop blocks (312) to allow stray light to enter the second anti-reflection layer (103) through the hollow area (311).

7. A low stray light periscope zoom motor according to claim 1 or 6, characterized in that: A plurality of recessed portions (315) are provided on a side of the lens holder (310) facing away from the bottom surface (102) of the hollow chamber (101); and a side of the lens holder (310) close to the reflective component (200) is provided with a yielding portion (314) arranged relatively along a second direction, so as to allow stray light to enter between the recessed portions (315) and the housing (100) and / or between the second anti-reflection layer (103) and the lens holder (310), thereby reducing or eliminating the possibility that the outgoing light of the reflective component (200) is reflected and enters the lens (320).

8. The low stray light periscope zoom motor according to claim 6, characterized in that: The distance between the inner walls (313) of the two limiting blocks (312) in the third direction tends to increase along the first direction.

9. The low stray light periscope zoom motor according to claim 1, characterized in that: The housing (100) comprises a base (110) and an outer shell (120); the outer shell (120) is sleeved on the base (110); the light inlet (121) is arranged on the outer shell (120); the inner side surface of the outer shell (120) is provided with a black-plated layer; the base (110) is made of black plastic; and a metal sheet is embedded on the base (110) at a position opposite to the second anti-reflection layer (103).

10. The low stray light periscope zoom motor according to claim 1, characterized in that: The angle between the light-emitting surface (106) of the light-emitting port (105) and the first direction is θ, 30°≤θ≤90°; the roughness of the light-emitting surface (106) is Ra>0.4 um.

Images