CN118519220A - Optical path turning element and long focus camera module - Google Patents

Abstract

The present invention provides an optical path deflecting element and a telephoto camera module, wherein the optical path deflecting element comprises a prism body and a light-blocking groove, wherein the prism body has a top surface, a bottom surface, a first reflecting surface and a second reflecting surface located at the ends of the top surface and the bottom surface, an incident port and an exit port of the optical path deflecting element are formed on the top surface, incident light is incident from the incident port of the top surface to the prism body of the optical path deflecting element, and is exited from the exit port after multiple optical path turns, wherein the light-blocking groove is formed at the bottom of the prism body, wherein the inner wall of the light-blocking groove has a first groove surface, an inclined surface, a curved surface and a second groove surface, wherein the first groove surface, the inclined surface, the curved surface and the second groove surface extend in sequence along the inner wall of the light-blocking groove.

Description

Optical path folding element and telephoto camera module

Technical Field

The invention relates to the field of optical technology, and in particular to an optical path deflection element and a telephoto camera module.

Background Art

The periscope camera module is used for long-focus shooting, which can fold the light path and reduce the size. However, the usual periscope camera module adopts the form of prism + lens. The incident light is folded once by the prism to achieve a folded light path, and then passes through the lens to the photosensitive part for imaging. Therefore, the effect of folding the light path is not obvious, and it is difficult to achieve super-telephoto shooting.

The existing periscope camera module stacks prisms, lenses and photosensitive components on a plane perpendicular to the thickness direction of the mobile phone (Z direction), occupying a certain area, so the XY size is large, which is not conducive to the miniaturization of the camera module. With the continuous development of technology, telephoto camera modules have begun to use special-shaped prisms, which are used to fold the light path multiple times to enhance the folding effect and achieve super telephoto shooting. The special-shaped prism is set on a plane perpendicular to the Z direction, which is conducive to reducing the XY size.

Referring to FIG. 1 and FIG. 2, a schematic diagram of the optical path of a camera module using an optical path folding device in the prior art is shown, wherein the optical path folding device (i.e., a special-shaped prism) has a bottom groove in an inverted U shape, and the top arc diffuses the light incident thereto, which has a certain effect of improving stray light. The optical path folding device of the prior art also has at least one of the following negative defects: first, when the incident light is reflected multiple times in the prism, it is more likely to cause the problem of inconsistent vignetting center areas due to the unexpected optical interface being a curved surface, resulting in multiple points and stray light areas with larger energy levels; second, a larger circle provides a larger reflection surface, so that part of the light beam is reflected multiple times to reach the photosensitive component, increasing ghosting, glare and other phenomena, and stray light phenomenon is difficult to improve; third, the larger the radius of the circle, the smaller the curvature, and the reflection surface with a smaller curvature may cause the light beam to be incident at a position far from the center, increasing the path length to the imaging plane, thereby increasing the vignetting effect. The light beam may produce more aberrations on the reflection surface with a smaller curvature, such as spherical aberration, coma, etc., which will affect the imaging quality. A reflective surface with a small curvature will increase the optical path length of the light beam, which may cause a delay of the edge beam relative to the central beam and affect the synchronization of imaging.

Summary of the invention

A major advantage of the present invention is that it provides an optical path deflection element and a telephoto camera module, wherein the optical path deflection element reduces the reflection area of the ineffective area compared to the prior art, which is beneficial to reduce the reflected ineffective light and reduce stray light.

Another advantage of the present invention is that it provides an optical path deflecting element and a telephoto camera module, wherein the optical path deflecting element increases the curvature of the reflecting surface, which is conducive to more evenly distributing light, reducing the brightness difference between the center and the edge, weakening the vignetting effect, and improving illumination uniformity.

Another advantage of the present invention is that it provides an optical path deflecting element and a telephoto camera module, wherein the optical path deflecting element has a smaller reflective surface and a larger curvature, and the reflected light is less, more diffuse, and more uniform, and the light spot of stray light is dispersed, the brightness is reduced, becomes smaller and darker, or disappears.

Another advantage of the present invention is that it provides an optical path deflecting element and a telephoto camera module, wherein a groove is provided at the bottom of the optical path deflecting element, wherein the groove has a first straight surface, an inclined surface, a curved surface and a second straight surface, the inclined surface of the groove is connected to the curved surface, and the primary shading structure of the inclined surface itself is utilized, plus a rounded corner as an unexpected optical interface, to increase a primary shading cover, and the star point stray light energy level becomes smaller.

Another advantage of the invention is that it provides an optical path deflecting element and a telephoto camera module, wherein the rounded corner portion of the groove of the optical path deflecting element has a three-dimensional concave-convex wavy structure, which is distributed in a wavy shape along the extension direction of the rounded corner, which is beneficial to further reduce the reflection area and reduce the reflected light.

According to one aspect of the present invention, an optical path deflection element of the present invention that can achieve the aforementioned objects and other objects and advantages comprises:

A prism body, wherein the prism body has a top surface, a bottom surface, a first reflecting surface and a second reflecting surface located at ends of the top surface and the bottom surface, an incident port and an exit port of the optical path deflecting element are formed on the top surface, incident light enters the prism body of the optical path deflecting element from the incident port of the top surface, and exits from the exit port after multiple optical path deflections; and

A light-blocking groove, wherein the light-blocking groove is formed at the bottom of the prism body, wherein the inner wall of the light-blocking groove has a first groove surface, an inclined surface, a curved surface and a second groove surface, wherein the first groove surface, the inclined surface, the curved surface and the second groove surface extend in sequence along the inner wall of the light-blocking groove.

According to an embodiment of the present invention, the arc surface of the light blocking groove is closer to the top surface than the inclined surface, and the arc surface is located on a side close to the emission port to block reflected ineffective light.

According to an embodiment of the present invention, the arcuate surface has at least one rounded surface unit.

According to one embodiment of the present invention, the first groove surface and the second groove surface are straight surfaces, the inclined surface of the light-blocking groove extends from the end of the first groove surface from bottom to top to the arc-shaped surface, and the inclined surface faces the side of the incident port, and its extension direction is adapted to the path of the effective light.

According to an embodiment of the present invention, the straight width of the arc surface is less than or equal to half of the overall width of the light blocking groove.

According to an embodiment of the present invention, the fillet radius corresponding to at least one fillet surface unit of the arc-shaped surface of the light-blocking groove is R, wherein R≤0.2±0.05 mm.

According to one embodiment of the present invention, the first reflecting surface and the second reflecting surface extend obliquely downward from the end of the top surface to the end of the bottom surface, wherein the first reflecting surface and the second reflecting surface are used to reflect incident light to form a reflecting light path.

According to one embodiment of the present invention, the prism body is implemented as a trapezoidal prism, wherein the top surface of the prism body is larger than the bottom surface, and the first reflecting surface and the second reflecting surface are reflecting surfaces inclined from top to bottom and from outside to inside.

According to an embodiment of the present invention, the light blocking groove is further provided with a diffuse reflective structure, wherein the diffuse reflective structure is formed on the arc surface of the light blocking groove.

According to an embodiment of the present invention, the diffuse reflective structure of the light blocking groove is a three-dimensional concave-convex wavy structure formed on the arc surface of the light blocking groove, and is distributed in a wavy shape along the extension direction of the rounded surface of the arc surface.

According to an embodiment of the present invention, the optical path deflecting element includes at least one optical element, wherein the incident port and the exit port are located in the same plane.

According to another aspect of the present application, the present application further provides a telephoto camera module, including:

Lens assembly;

An optical path deflecting assembly, wherein the optical path deflecting assembly comprises an optical path deflecting element and a bracket as described above, wherein the optical path deflecting element is disposed on the bracket; and

A photosensitive component, wherein the lens component and the photosensitive component are arranged on the same side of the optical path deflecting component, the incident light enters the optical path deflecting component along the optical axis direction of the lens component, and after multiple turns in the optical path deflecting component, is emitted to the photosensitive component along the optical axis direction of the photosensitive component, wherein the photosensitive component converts the optical signal of the incident light into a corresponding electrical signal.

According to one embodiment of the present invention, the optical path deflecting assembly further comprises at least one light-shielding layer, wherein the light-shielding layer is disposed on at least a portion of the surface of the prism body.

According to one embodiment of the present invention, the shading layer includes at least a first shading unit and at least a second shading unit, wherein the first shading unit is arranged on the periphery of the top surface, the periphery of the first reflecting surface and the periphery of the second reflecting surface, and the second shading unit is arranged on the first side surface, the second side surface and the bottom surface, wherein the second shading unit blocks the entire surface of the first side surface, the second side surface and the bottom surface.

According to one embodiment of the present invention, the bracket has a accommodating space and a light opening connected to the accommodating space, wherein the optical path deflecting element is accommodated in the accommodating space of the bracket, and the bracket includes a supporting mechanism and a accommodating unit, wherein the accommodating space is formed inside the accommodating unit, and the supporting mechanism of the bracket surrounds the periphery of the light opening.

According to one embodiment of the present invention, the lens assembly includes at least one lens and at least one driving motor, wherein the at least one lens is arranged on the driving motor, and wherein the projection of the light blocking groove along the optical axis direction of the lens assembly falls into the projection of the driving motor of the lens assembly.

According to one embodiment of the present invention, the inclined surface of the light blocking groove faces the position of the lens assembly, and the arc surface of the light blocking groove is closer to the photosensitive component than the inclined surface to reduce the ineffective light reflected to the photosensitive component.

According to one embodiment of the present invention, the supporting mechanism further includes a first supporting unit and a second supporting unit, wherein the driving motor of the lens assembly is disposed on the first supporting unit, and the photosensitive assembly is disposed on the second supporting unit.

Further objects and advantages of the present invention will be fully apparent from an understanding of the following description and the accompanying drawings.

These and other objects, features and advantages of the present invention will be more fully understood from the following detailed description and accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. In the accompanying drawings, unless otherwise specified, the same reference numerals are used to represent the same components. Among them:

FIG. 1 is a schematic diagram of the optical path of a special-shaped prism in the prior art.

FIG. 2 is a schematic diagram of stray light generated by a part of the light beam when a camera module adopts a special-shaped prism in the prior art.

FIG. 3 is a schematic diagram of the overall structure of a telephoto camera module according to a first preferred embodiment of the present invention.

FIG. 4 is an exploded schematic diagram of the telephoto camera module according to the first preferred embodiment of the present invention.

FIG. 5 is a cross-sectional view of the telephoto camera module according to the first preferred embodiment of the present invention.

FIG. 6 is an overall schematic diagram of the optical path deflecting element of the telephoto camera module according to the first preferred embodiment of the present invention.

FIG. 7 is a side view of the optical path deflecting element of the telephoto camera module according to the first preferred embodiment of the present invention.

FIG. 8 is an enlarged schematic diagram of a partial structure of the optical path deflecting element of the telephoto camera module according to the first preferred embodiment of the present invention.

FIG. 9 is a schematic diagram of the optical path of the optical path deflecting element of the telephoto camera module according to the first preferred embodiment of the present invention.

FIG. 10 is a schematic diagram of stray light generated by a partial light beam of the telephoto camera module according to the first preferred embodiment of the present invention.

FIG. 11 is a schematic structural diagram of the optical path deflecting element of the telephoto camera module according to the first preferred embodiment of the present invention.

FIG. 12 is an enlarged schematic diagram of the groove of the optical path deflecting element of the telephoto camera module according to the first preferred embodiment of the present invention.

In the figure: 10, lens assembly; 11, lens; 12, driving motor; 20, optical path deflection assembly; 21, optical path deflection element; 201, incident port; 202, exit port; 211, optical element; 210, prism body; 2101, top surface; 21011, light entrance section; 21012, light exit section; 21013, reflection section; 2102, bottom surface; 2103, first reflection surface; 2104, second reflection surface; 2105, first side surface; 2106, second side surface; 212, light blocking groove; 2121, first groove surface; 2122, inclined surface; 2123, arc surface; 2124, second groove surface; 2125, diffuse reflection structure; 22, bracket; 2201, accommodating space; 2202, light through port; 221, bearing mechanism; 2211, first bearing unit; 2212, second bearing unit; 222, accommodating unit; 23, light shielding layer; 231, first light shielding unit; 232, second light shielding unit; 30, photosensitive component; 31, circuit board; 32, photosensitive chip; 33, chip base; 34, filter.

DETAILED DESCRIPTION

It should be pointed out that the embodiments shown in the drawings are only used as examples to specifically and vividly explain and illustrate the concept of the present invention. The size and structure thereof are not necessarily drawn to scale, nor do they constitute a limitation to the concept of the present invention.

The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the various drawings. They are relative concepts and may change accordingly according to different positions and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

With reference to Figures 3 to 12 of the accompanying drawings of the present application specification, a telephoto camera module according to the first preferred embodiment of the present application is explained in the following description, wherein the telephoto camera module includes a lens assembly 10, an optical path folding assembly 20 and a photosensitive assembly 30, wherein the lens assembly 10 and the photosensitive assembly 30 are arranged on the same side of the optical path folding assembly 20, and the incident light enters the optical path folding assembly 20 along the optical axis direction of the lens assembly 10, and after multiple turns in the optical path folding assembly 20, is emitted to the photosensitive assembly 30 along the optical axis direction of the photosensitive assembly 30, wherein the photosensitive assembly 30 converts the optical signal of the incident light into a corresponding electrical signal.

In this preferred embodiment of the present application, the optical path deflecting component 20 has a light incident side and a backlight side arranged back to back, wherein the lens assembly 10 and the photosensitive assembly 30 are arranged on the light incident side of the optical path deflecting component 20, and the optical axis defined by the lens assembly 10 and the optical axis of the photosensitive assembly 30 are parallel.

Assume that the direction of the optical axis of the lens assembly 10 and the photosensitive assembly 30 is the Z axis, wherein the lens assembly 10 and the photosensitive assembly 30 are arranged along the XY plane perpendicular to the Z axis, and the lens assembly 10 and the photosensitive assembly 30 are arranged side by side and stacked on the same side of the optical path folding assembly 20 to avoid increasing the height in the Z axis direction. It can be understood that the lens assembly 10 and the photosensitive assembly 30 are arranged on the same side of the optical path folding assembly 20, and the optical path folding times are increased by the optical path folding assembly 20, shortening the optical path, so as to achieve shooting with a longer focal length and reduce the size in the XY direction.

As shown in FIG4 , the lens assembly 10 includes at least one lens 11 and at least one driving motor 12, wherein the at least one lens 11 is disposed on the driving motor 12, and the driving motor 12 drives the lens 11 to move along the optical axis to achieve automatic focusing; or the driving motor 12 drives the lens 11 to move along a direction perpendicular to the optical axis to achieve optical image stabilization, i.e., optical image stabilization.

The photosensitive component 30 includes a circuit board 31, a photosensitive chip 32 and a chip base 33, wherein the photosensitive chip 32 is disposed on the circuit board 31, and the photosensitive chip 32 is conductively connected to the circuit board 31, wherein the photosensitive surface of the photosensitive chip 32 faces the optical path deflection component 20. The chip base 33 is fixedly disposed on the circuit board 31, wherein the chip base 33 is provided with a receiving space for receiving the photosensitive chip 32, and the photosensitive chip 32 is fixed at a specific position of the circuit board 31 by the chip base 33.

The photosensitive component 30 further includes a filter 34, wherein the filter 34 is fixed at the front end of the photosensitive path of the photosensitive chip 32, and is located between the photosensitive chip 32 and the optical path deflection component 20. The incident light reaches the photosensitive surface of the photosensitive chip 32 after passing through the filter 34.

The optical path deflecting component 20 includes an optical path deflecting element 21 and a bracket 22, wherein the optical path deflecting element 21 is arranged in the accommodating space of the bracket 22, and the optical path deflecting element 21 has an incident port 201 and an exit port 202, wherein the incident port 201 and the exit port 202 of the optical path deflecting element 21 are located on the same side of the optical path deflecting element 21, the light passing port of the lens assembly 10 is opposite to the incident port 201 of the optical path deflecting element 21, and the photosensitive surface of the photosensitive chip 32 of the photosensitive assembly 30 corresponds to the exit port 202 of the optical path deflecting element 21.

The incident light passes through the lens assembly 10 and enters from the incident port 201 of the optical path deflecting element 21 . After being deflected multiple times by the optical path deflecting element 21 , the incident light is emitted from the exit port 202 of the optical path deflecting element 21 to the photosensitive component 30 .

The optical path deflecting element 21 is implemented as a prism, and the light incident on the optical path deflecting element 21 can be reflected by the inner surface of the optical path deflecting element 21 to form a reflected light path along a specific direction, that is, the number of times the optical path is folded is increased by deflecting the optical path to achieve shooting with a longer focal length.

Specifically, the optical path deflecting element 21 includes at least one optical element 211, wherein the incident port 201 and the exit port 202 are located in the same plane. Preferably, in a specific example of the present application, the number of the optical element 211 of the optical path deflecting element 21 is one, that is, the optical path deflecting element 21 is an integrated optical element. In another optional embodiment of the present application, the optical path deflecting element 21 includes two or more optical elements 211, that is, the optical path deflecting element 21 is assembled from two or more optical elements 211, wherein the incident port 201 and the exit port 202 are formed on the same side, and the incident port 201 and the exit port 202 are in the same plane.

The bracket 22 has a accommodating space 2201 and a light opening 2202 connected to the accommodating space 2201, wherein the optical path deflecting element 21 is accommodated in the accommodating space 2201 of the bracket 22, the incident port 201 and the exit port 202 of the optical path deflecting element 21 correspond to the light opening 2202 of the bracket 22, the lens assembly 10 and the photosensitive assembly 30 are arranged on the bracket 22, and the incident light passes through the lens 11 of the lens assembly 10 and the light opening 2202 of the bracket 22 to reach the incident port 201 of the optical path deflecting element 21, and the light emitted through the exit port 202 of the optical path deflecting element 21 is emitted from the light opening 2202 of the bracket 22 to the photosensitive chip 32 of the photosensitive assembly 30.

The bracket 22 includes a bearing mechanism 221 and a receiving unit 222, wherein the receiving space 2201 is formed inside the receiving unit 222, and the bearing mechanism 221 of the bracket 22 surrounds the periphery of the light-passing port 2202. The driving motor 12 of the lens assembly 10 and the photosensitive assembly 30 are disposed on the same side of the bearing mechanism 221 of the bracket 22, and the optical path deflecting element 21 is fixed to the receiving space 2201 by the receiving unit 222.

Preferably, in this preferred embodiment of the present application, the bracket 22 is an integrated structure, that is, the supporting mechanism 221 and the receiving unit 222 are integrally formed.

The supporting mechanism 221 further includes a first supporting unit 2211 and a second supporting unit 2212 , wherein the driving motor 12 of the lens assembly 10 is disposed on the first supporting unit 2211 , and the photosensitive assembly 30 is disposed on the second supporting unit 2212 .

As shown in Figure 6, the optical path deflecting element 21 includes a prism body 210, and a top surface 2101, a bottom surface 2102 formed on the prism body 210, a first reflecting surface 2103 and a second reflecting surface 2104 located at the ends of the top surface 2101 and the bottom surface 2102, wherein the top surface 2101 is located at the top of the prism body 210, and the bottom surface 2102 is directly opposite to the top surface 2101 and is located at the bottom of the prism body 210.

The incident port 201 and the exit port 202 of the optical path deflection element 21 are formed on the top surface 2101, that is, the incident light is incident from the incident port 201 of the top surface 2101 to the prism body 210 of the optical path deflection element 21, and is emitted from the exit port 202 to the photosensitive component 30 after multiple optical path deflections.

The first reflecting surface 2103 and the second reflecting surface 2104 extend obliquely downward from the end of the top surface 2101 to the end of the bottom surface 2102, wherein the first reflecting surface 2103 and the second reflecting surface 2104 are used to reflect incident light to form a reflecting light path.

It is worth mentioning that in this preferred embodiment of the present application, the prism body 210 of the optical path deflection element 21 is implemented as a trapezoidal prism, wherein the top surface 2101 of the prism body 210 is larger than the bottom surface 2102, and the first reflecting surface 2103 and the second reflecting surface 2104 extending downward from the end of the top surface 2101 to the end of the bottom surface 2102 are reflective surfaces inclined from top to bottom and from outside to inside.

The prism body 210 of the optical path deflecting element 21 is further provided with a first side surface 2105 and a second side surface 2106 , wherein the first side surface 2105 and the second side surface 2106 are located on both sides of the first reflecting surface 2103 and the second reflecting surface 2104 .

The top surface 2101 of the prism body 210 further includes a light-incoming section 21011, a light-outgoing section 21012, and a reflective section 21013 located between the light-incoming section 21011 and the light-outgoing section 21012, wherein the incident port 201 is formed in the light-incoming section 21011 of the top surface 2101, and the exit port 202 is formed in the light-outgoing section 21012 of the top surface 2101. The reflective section 21013 of the top surface 2101 has a reflective surface, and when the incident light incident to the prism body 210 is reflected to the reflective section 21013 of the top surface 2101, the reflective section 21013 reflects the incident light to form a reflective light path.

As shown in Fig. 6 to Fig. 9, the optical path deflecting element 21 is further provided with a light blocking groove 212, wherein the light blocking groove 212 is formed at the bottom of the prism body 210, shielding the ineffective light incident into the optical path deflecting element 21, and its projection along the Z-axis direction falls into the projection of the driving motor 12 of the lens assembly 10, and does not fall into the projection of the lens 11 and the photosensitive chip 32. The light blocking groove 212 does not interfere with the incident imaging light, and adjusts the edge light beam incident into the prism body 210 to improve the stray light of the imaging.

The light blocking groove 212 of the optical path deflecting element 21 has an opening facing downward, wherein the light blocking groove 212 extends from the bottom to the top from the bottom surface 2102 of the prism body 210, and both ends of the light blocking groove 212 are connected to the first side surface 2105 and the second side surface 2106, and the light blocking groove 212 extends from the first side surface 2105 to the second side surface 2106 in a direction perpendicular to the Z axis.

As shown in FIG9 , part of the incident light entering the prism body 210 is diffused on the surface of the light blocking groove 212 , wherein the light blocking groove 212 does not interfere with the imaging light, and adjusts the edge light beam incident to the prism body 210 , thereby improving the imaging stray light.

The light-blocking groove 212 has an opening toward the bottom surface 2102, and the inner wall of the light-blocking groove 212 has a first groove surface 2121, an inclined surface 2122, a curved surface 2123, and a second groove surface 2124, wherein the first groove surface 2121, the inclined surface 2122, the curved surface 2123, and the second groove surface 2124 extend in sequence along the inner wall of the light-blocking groove 212. The first groove surface 2121 and the second groove surface 2124 are located at both sides of the light-blocking groove 212, and the first groove surface 2121 and the second groove surface 2124 are arranged face to face. The inclined surface 2122 and the curved surface 2123 are located at the top ends of the first groove surface 2121 and the second groove surface 2124, wherein the inclined surface 2122 is located between the first groove surface 2121 and the curved surface 2123, and the curved surface 2123 is located between the inclined surface 2122 and the second groove surface 2124.

Preferably, in this preferred embodiment of the present application, the first groove surface 2121 and the second groove surface 2124 are straight surfaces, that is, the first groove surface 2121 and the second groove surface 2124 are parallel to the direction of the Z axis.

It is worth mentioning that in this preferred embodiment of the present application, the inclined surface 2122 is toward the side of the incident port 201, and its extension direction is adapted to the path of the effective light, so it will not block the effective light on the effective path; the arc surface 2123 is close to the side of the exit port 202, reducing the ineffective light reflected to the photosensitive component. In other words, the inclined surface 2122 will not block the incident effective light and will not affect the imaging of the effective light.

The arc surface 2123 of the light-blocking groove 212 is closer to the top surface 2101 than the inclined surface 2122, wherein the inclined surface 2122 of the light-blocking groove 212 faces the incident port 201, and the arc surface 2123 is close to the exit port 202. It can be understood that the arc surface 2123 of the light-blocking groove 212 reflects incident stray light, and therefore, by reducing the area of the arc surface 2123 of the light-blocking groove 212, the ineffective light reflected by the light-blocking groove 212 can be reduced. The area of the arc surface 2123 of the light-blocking groove 212 in this preferred embodiment of the present application is reduced compared to the area of the inverted U-shaped arc surface of the prior art, thereby reducing the reflected ineffective light.

It is worth mentioning that the inclined surface 2122 of the light blocking groove 212 faces the position of the lens assembly 10, and the curved surface 2123 of the light blocking groove 212 is closer to the photosensitive component 30 than the inclined surface 2122. The inclined surface 2122 blocks the incident stray light from being reflected to the photosensitive component 30, and the curved surface 2123 helps to reduce the ineffective light reflected to the photosensitive component 30.

The inclined surface 2122 extends obliquely upward from the top of the first groove surface 2121 to the arc surface 2123 . The inclined surface 2122 forms a primary light shielding structure, that is, shielding a portion of ineffective light incident on the inclined surface 2122 .

The arc surface 2123 is an arc surface or an arc surface with a specific radius of curvature, wherein the arc surface 2123 has at least one rounded surface unit, wherein the cross section of the rounded surface unit is in a shape formed by a rounded corner. In another optional embodiment of the present application, the arc surface 2123 can also be implemented as an arc surface; in another optional embodiment of the present application, the arc surface 2123 can also be implemented as having at least one rounded surface unit and at least one arc surface, and the arc surface connects the rounded surface unit and the aforementioned inclined surface 2122.

It can be understood that in this preferred embodiment of the present application, the arc surface 2123 is a rounded surface with a specific curvature, which is smaller than the curvature of the prior art. Therefore, the ineffective light reflected by the arc surface 2123 is more diffuse and the degree of stray light is reduced.

As shown in FIG8 , the straight width of the arc surface 2123 is less than or equal to half of the overall width of the light blocking groove 212. Assume that the fillet radius corresponding to at least one fillet surface unit of the arc surface 2123 of the light blocking groove 212 is R, where R≤0.2±0.05mm. Furthermore, the arc surface 2123 of the light blocking groove 212 has two fillet surface units, and further, the two fillet surfaces have the same size.

It is worth mentioning that part of the light is reflected through an ineffective path and enters the photosensitive component 30, thereby causing stray light. Therefore, in this preferred embodiment of the present application, the inclined surface 2122 of the light-blocking groove 212 has little effect on the imaging light reaching the photosensitive component 30, wherein the inclined surface 2122 and the arc surface 2123 of the light-blocking groove 212 form a two-stage light-blocking structure to block stray light and improve the improvement effect of stray light.

It can be understood that, since the inclined surface 2122 and the arc surface 2123 are located between the first groove surface 2121 and the second groove surface 2124, the width of the arc surface 2123 of the light-blocking groove 212 is smaller than the width between the first groove surface 2121 and the second groove surface 2124. Therefore, the radius of the arc surface 2123 at the top of the light-blocking groove 212 in this preferred embodiment of the present application is smaller than the radius of the inverted U-shaped bottom groove in the prior art, and the reflection area of the arc surface 2123 is smaller, thereby reducing the reflected ineffective light and further reducing stray light.

It can be understood that the radius of curvature of a circle is equal to the radius and is inversely proportional to the curvature. The smaller the radius, the smaller the radius of curvature and the larger the curvature. Therefore, reducing the arc radius of the arc surface 2123 can increase the curvature of the reflecting surface. The arc surface 2123 can be used as a convex mirror for reflecting light, wherein a convex mirror with a larger radius of curvature has a smaller divergence angle of the reflected light; and a convex mirror with a smaller radius of curvature has a larger divergence angle of the reflected light. The larger the divergence angle, the more diffuse the light beam and the less stray light.

A reflective surface with a larger curvature helps to distribute light more evenly, reduce the brightness difference between the center and the edge, weaken the vignetting effect, and improve the uniformity of illumination. Combined with a smaller reflective surface and a larger curvature, the reflected light is less, more diffuse, and more uniform, and the spot of stray light is dispersed, the brightness is reduced, and it becomes smaller and darker, or disappears.

As shown in Figure 10, a schematic diagram of the star-point stray light generated by the optical path deflection element 21 is provided, wherein the inclined surface 2122 of the light-blocking groove 212 of the optical path deflection element 21 is connected to the curved surface 2123, wherein the light-blocking groove 212 utilizes the primary light-shielding structure of the inclined surface 2122 itself and the rounded corner of the curved surface 2123 as an unexpected optical interface, and adds a primary light-shielding cover, thereby reducing the energy level of the star-point stray light.

As shown in FIG6 and FIG7, the optical path deflection component 20 further includes at least one light shielding layer 23, wherein the light shielding layer 23 is arranged on at least part of the surface of the prism body 210, and is used to eliminate the influence of ineffective light and block the entry of external stray light. The light shielding layer 23 includes at least a first light shielding unit 231 and at least a second light shielding unit 232, wherein the first light shielding unit 231 is arranged around the periphery of the top surface 2101, the periphery of the first reflection surface 2103, and the periphery of the second reflection surface 2104. The first light shielding unit 231 can be, but is not limited to, a silk screen light shielding layer, a coating light shielding layer, and an ink light shielding layer. It can be understood that the first light shielding unit 231 is a light shielding material applied to the periphery of the top surface 2101, the periphery of the first reflection surface 2103, and the periphery of the second reflection surface 2104 by silk screen printing, coating, and ink blackening. The first light shielding unit 231 can eliminate the influence of ineffective light.

The second light shielding unit 232 is arranged on the first side surface 2105, the second side surface 2106 and the bottom surface 2102, wherein the second light shielding unit 232 shields the entire surface of the first side surface 2105, the second side surface 2106 and the bottom surface 2102, and is used to block the external stray light and the endogenous interference light. The light shielding structure limits the stray light from entering the optical path folding element, and suppresses the glare. As an example, in this preferred embodiment of the present application, the second light shielding unit 232 is implemented as a black-plated light shielding layer, a film-plated light shielding layer, an ink light shielding layer, a silk-screen light shielding layer, etc.

It is worth mentioning that the first light shielding unit 231 and the second light shielding unit 232 of the light shielding layer 23 are formed by black coating a portion of the outer surface of the prism body 210, mainly to reduce the interference of external ambient light and improve the overall performance of the optical system. When the incident light is reflected on the inner surface of the prism body 210, the light shielding layer 23 can reduce stray light.

It is understandable that in an optical system, unwanted reflections and scattered light (stray light) may cause blurred imaging or glare. The black-plated outer surface (i.e., the first shading unit 231 and the second shading unit 232 of the shading layer 23) helps to reduce such stray light. The shading layer 23 can reduce the escape of internal reflections. If the light reflected inside the prism escapes to the outside, it may re-enter the system and cause interference. The black-plated outer surface helps to absorb these escaped lights and reduce their impact on imaging. The shading layer 23 can absorb specific wavelengths: if the black-plated coating is designed for specific wavelengths, it can also increase the absorption rate of light at these wavelengths, thereby optimizing the performance of the prism within a specific spectral range. The shading layer 23 can reduce the intensity of reflected light and help reduce ghosting and light spot phenomena caused by reflections. By reducing external reflections and stray light, the shading layer 23 can improve the contrast of system imaging, making the image clearer and more vivid.

As shown in FIG. 11 and FIG. 12 , in a specific example of the present application, the light-blocking groove 212 is further provided with a diffuse reflective structure 2125, wherein the diffuse reflective structure 2125 is formed on the arc surface 2123 of the light-blocking groove 212, and reduces reflected light by diffuse reflection. Preferably, in a specific example of the present application, the diffuse reflective structure 2125 of the light-blocking groove 212 is a three-dimensional concave-convex wavy structure formed on the arc surface 2123 of the light-blocking groove 212, and is distributed in a wavy shape along the extension direction of the rounded surface of the arc surface 2123. The diffuse reflective structure 2125 of the light-blocking groove 212 further reduces the reflection area through the three-dimensional concave-convex wavy structure, thereby reducing the reflected light.

It can be understood that the wavy structure of the diffuse reflective structure 2125 formed on the arc surface 2123 reduces the actual mirror area, thereby reducing the direct reflection of the mirror. The diffuse reflective structure 2125 increases the surface roughness, such as the wavy silk screen increases the microscopic roughness of the surface, so that the light that may have been reflected by the mirror is converted into diffuse reflection. This scattering effect can reduce the intensity of the reflected light and reduce glare. The diffuse reflective structure 2125 changes the reflection angle, such as the wavy silk screen changes the geometric shape of the surface, which means that the incident light will be reflected at different angles when it contacts the surface, reducing the concentration of parallel reflected light and reducing the intensity of reflected light. The diffuse reflective structure 2125 scatters at multiple angles, such as the multi-peak and multi-valley structure of the wavy silk screen, which can scatter the reflected light in multiple directions, reducing the reflection intensity in a specific direction. The diffuse reflective structure 2125 reduces the reflection concentration, wherein the reflected light is not concentrated in one direction, but dispersed in multiple directions, reducing the concentration of the reflected light.

In addition, the diffuse reflective structure 2125 can further absorb part of the light. If the material used for the wavy silk screen has light absorption characteristics, it can absorb part of the incident light and further reduce reflection. The diffuse reflective structure 2125 can reduce highlights. A smooth mirror surface will produce highlights, while the wavy silk screen reduces the generation of highlights through its shape, making the reflected light softer.

The diffuse reflective structure 2125 can be formed on the arc surface 2123 by screen printing technology, coating technology, photolithography technology, physical etching technology, mechanical processing or integrated mold forming. For example, a pattern or texture can be formed on the surface of an optical element by screen printing technology. By designing a specific screen pattern, a wavy or other shaped silk screen can be formed on the surface of the lens. Optionally, a layer of special material is coated on the surface of the optical element, and then processed by a specific process, so that the coating can form a wavy or other shaped texture, or a fine concave-convex texture can be formed on the surface of the optical element; or the surface of the optical element can be etched by laser or other physical means to form a fine concave-convex texture. Optionally, a specific texture can be formed on the surface of the optical element by mechanical grinding, polishing and other means; or a mold with a specific texture can be used in the manufacturing process to directly form the desired concave-convex texture on the surface of the optical element.

It can be understood that the manner in which the diffuse reflective structure 2125 is formed is merely an example and not a limitation.

It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims (15)

1. An optical path deflection element, characterized in that it comprises: A prism body, wherein the prism body has a top surface, a bottom surface, a first reflecting surface and a second reflecting surface located at ends of the top surface and the bottom surface, an incident port and an exit port of the optical path deflecting element are formed on the top surface, incident light enters the prism body of the optical path deflecting element from the incident port of the top surface, and exits from the exit port after multiple optical path deflections; and A light-blocking groove, wherein the light-blocking groove is formed at the bottom of the prism body, wherein the inner wall of the light-blocking groove has a first groove surface, an inclined surface, a curved surface and a second groove surface, wherein the first groove surface, the inclined surface, the curved surface and the second groove surface extend in sequence along the inner wall of the light-blocking groove. 2. The optical path deflecting element according to claim 1, wherein the arc surface of the light blocking groove is closer to the top surface than the inclined surface, and the arc surface is located on a side close to the emission port to block reflected ineffective light. 3. The optical path deflecting element according to claim 2, wherein the arcuate surface has at least one rounded surface unit. 4. The optical path deflecting element according to claim 2, wherein the first groove surface and the second groove surface are straight surfaces, the inclined surface of the light-blocking groove extends upward from the end of the first groove surface from bottom to the arc-shaped surface, and the inclined surface faces the side of the incident port, and its extension direction is adapted to the path of the effective light. 5 . The optical path deflecting element according to claim 2 , wherein the straight width of the arcuate surface is less than or equal to half of the overall width of the light blocking groove. 6 . The optical path deflecting element according to claim 3 , wherein the fillet radius corresponding to at least one fillet surface unit of the arc-shaped surface of the light-blocking groove is set to R, wherein R≤0.2±0.05 mm. 7. The optical path deflecting element according to any one of claims 1 to 6, wherein the light blocking groove is further provided with a diffuse reflective structure, wherein the diffuse reflective structure is formed on the arc surface of the light blocking groove. 8. The optical path deflecting element according to claim 7, wherein the diffuse reflective structure of the light blocking groove is a three-dimensional concave-convex wavy structure formed on the arc surface of the light blocking groove, and is distributed in a wavy shape along the extension direction of the rounded surface of the arc surface. 9. The light path deflecting element according to claim 7, wherein the light path deflecting element comprises at least one optical element, wherein the incident port and the exit port are located in the same plane. 10. A telephoto camera module, characterized in that it comprises: Lens assembly; An optical path deflecting assembly, wherein the optical path deflecting assembly comprises an optical path deflecting element and a bracket as claimed in any one of claims 1 to 9, wherein the optical path deflecting element is arranged on the bracket; and A photosensitive component, wherein the lens component and the photosensitive component are arranged on the same side of the optical path deflecting component, the incident light enters the optical path deflecting component along the optical axis direction of the lens component, and after being deflected multiple times in the optical path deflecting component, is emitted to the photosensitive component along the optical axis direction of the photosensitive component, wherein the photosensitive component converts the optical signal of the incident light into a corresponding electrical signal. 11. The telephoto camera module according to claim 10, wherein the optical path deflection component further comprises at least one light-shielding layer, wherein the light-shielding layer is disposed on at least a portion of the surface of the prism body. 12. The telephoto camera module according to claim 10, wherein the bracket has a accommodating space and a light opening connected to the accommodating space, wherein the optical path deflecting element is accommodated in the accommodating space of the bracket, and the bracket comprises a supporting mechanism and a accommodating unit, wherein the accommodating space is formed inside the accommodating unit, and the supporting mechanism of the bracket surrounds the periphery of the light opening. 13. The telephoto camera module according to claim 12, wherein the lens assembly comprises at least one lens and at least one driving motor, wherein the at least one lens is arranged on the driving motor, and wherein the projection of the light blocking groove along the optical axis direction of the lens assembly falls into the projection of the driving motor of the lens assembly. 14. The telephoto camera module according to claim 13, wherein the inclined surface of the light blocking groove faces the position of the lens assembly, and the arc surface of the light blocking groove is closer to the photosensitive component than the inclined surface to reduce the ineffective light reflected to the photosensitive component. 15. The telephoto camera module according to claim 14, wherein the supporting mechanism further comprises a first supporting unit and a second supporting unit, wherein the driving motor of the lens assembly is arranged on the first supporting unit, and the photosensitive assembly is arranged on the second supporting unit.