Light path folding prism and camera module

Abstract

The utility model discloses a light path folding prism and a camera module, and belongs to the technical field of camera modules. The optical path folding prism comprises a body, the body is provided with a first surface, a second surface, a third surface, a fourth surface and a fifth surface, and the second surface and the third surface are oppositely arranged and are respectively connected with the first surface. The fourth surface and the fifth surface are oppositely arranged and are respectively connected with the first surface, the second surface and the third surface; the roughness of the fourth surface and the fifth surface is greater than 0.5 [mu] m, and incident light enters from the first surface and exits from the first surface after being reflected for multiple times in the body. According to the optical path folding prism and the camera module provided by the invention, the abnormal shadow defect can be improved to a certain extent.

Description

Technical Field

[0001] The present application belongs to the technical field of camera modules, and in particular, relates to an optical path folding prism and a camera module. Background Art

[0002] Large aperture telephoto modules have good shooting distance and shooting quality, and are widely installed on various terminal devices. However, on relatively small and thin terminals such as smartphones, the installation space of camera modules is small, and it is difficult to install camera modules with long optical paths. For this reason, prisms are often set between the lens and the imaging chip to fold the optical path, so that the incident light is reflected multiple times to extend the optical path and achieve a long focal length.

[0003] However, when shooting strong light such as the sun, the bright moon, and street lights, the ultra-thin, large-bottom, large-aperture, and long-focus mobile phone module based on the prism optical path folding principle is prone to abnormal light and shadow such as ghosting, glare, and irregularly shaped light spots in the picture, which seriously affects the shooting quality. Summary of the invention

[0004] The present application provides an optical path folding prism and a camera module, which are intended to at least to some extent solve the technical problem that abnormal light and shadows are prone to appear in the pictures taken by the large aperture telephoto camera module.

[0005] In one aspect of an embodiment of the present application, a light path folding prism is provided, comprising: a body, wherein a first surface, a second surface, a third surface, a fourth surface and a fifth surface are provided on the body, wherein the second surface is arranged opposite to the third surface and respectively connected to the first surface, and the fourth surface and the fifth surface are arranged opposite to each other and respectively connected to the first surface, the second surface and the third surface;

[0006] The roughness of the fourth surface and the fifth surface is greater than 0.5 um, and the incident light enters from the first surface and is emitted from the first surface after multiple reflections in the body.

[0007] In some embodiments, a light blocking mechanism is disposed in the main body to block interfering light in the main body.

[0008] In some embodiments, the body is further provided with a sixth surface opposite to the first surface, and the sixth surface is connected to the second surface, the third surface, the fourth surface and the fifth surface respectively;

[0009] The light blocking mechanism includes a first groove arranged on the sixth surface and a light blocking material arranged in the first groove.

[0010] In some embodiments, the light blocking mechanism further includes a light blocking film disposed on a local area of ​​one or more of the first surface, the second surface, the third surface, the fourth surface, the fifth surface, and the sixth surface.

[0011] In some embodiments, one or more regions of the first surface, the second surface, the third surface, the fourth surface, the fifth surface, and the sixth surface corresponding to the regions covered with the light-blocking film are configured as a hazed surface.

[0012] In some embodiments, the light blocking mechanism includes a second groove provided on the fifth surface and / or a third groove provided on the sixth surface and a light blocking material provided in the second groove and the third groove.

[0013] In some embodiments, the body includes two separate parts, and the two separate parts are bonded by a bonding material;

[0014] The light blocking mechanism comprises a light blocking material layer arranged between the bonding surfaces of the two separate bodies.

[0015] In some embodiments, an edge of one side of the light-blocking material layer close to the center of the body is configured to be in a straight line shape, a wave shape, an arc shape, or a combination of multiple shapes thereof.

[0016] In another aspect of the embodiment of the present application, a camera module is provided, including a lens, an imaging chip and the optical path folding prism;

[0017] The lens and the imaging chip are arranged on the same side of the first surface, and the light emitted from the lens enters the light path folding prism from the first surface, and is emitted from the first surface to enter the imaging chip.

[0018] In some embodiments, the width of the optical path folding prism is greater than 2tanα·(H1+H2);

[0019] Wherein, α is the incident angle of the light incident from the first surface, H1 is the distance from the lens to the first surface, and H2 is the thickness of the body.

[0020] The embodiments of the present application have at least the following beneficial effects:

[0021] The optical path folding prism and camera module provided in the embodiments of the present application are provided with a first surface and a second surface and a third surface connected to and arranged opposite to the first surface on the prism body. Incident light can be incident from the first surface and reflected between multiple surfaces of the prism body, and finally emitted from the first surface, thereby realizing optical path folding, extending the optical path, and meeting the needs of telephoto shooting; at the same time, the roughness of the fourth surface and the fifth surface connected to the first surface, the second surface and the third surface is controlled to be above 0.5um, so as to limit the interference light such as reflected or refracted stray light formed by the large-angle incident light from the first surface projected onto the fourth surface and the fifth surface, thereby suppressing the imaging glare phenomenon to a certain extent, suppressing abnormal light and shadow, and improving the imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A schematic diagram of the structure of the optical path folding prism in an embodiment of the present application is shown;

[0024] Figure 2 Shows Figure 1 Left view of;

[0025] Figure 3 Shows Figure 1 A schematic structural diagram of the first surface of the light path folding prism and the light blocking film;

[0026] Figure 4 Shows another Figure 1 Schematic diagram of the structure of the optical path folding prism;

[0027] Figure 5 Shows Figure 4 A schematic diagram of the structure of a first light blocking mechanism of the optical path folding prism;

[0028] Figure 6 Shows Figure 4 A schematic diagram of the structure of a second light blocking mechanism of the optical path folding prism;

[0029] Figure 7 Shows Figure 4 A schematic diagram of the structure of the third light blocking mechanism of the optical path folding prism;

[0030] Figure 8 A schematic diagram of the structure of a camera module provided in an embodiment of the present application is shown;

[0031] Fig. 9 A schematic diagram of large-angle incident light projection of the light path folding prism provided in an embodiment of the present application is shown;

[0032] Fig.10 Shows Figure 1 Comparison of stray light effects under different widths of the optical path folding prism;

[0033] Fig.11 Shows Figure 1 Comparison of stray light effects under different roughness conditions of the fourth and fifth surfaces of the 8.4mm wide optical path folding prism;

[0034] Fig.12 Shows Figure 1 A comparison of the stray light effects under different roughness conditions of the fourth and fifth surfaces of the 9.4mm wide optical path folding prism.

[0035] Reference numerals:

[0036] 1-prism body, 1a-first split body, 1b-second split body, 11-first surface, 111-light blocking film, 12-second surface, 13-third surface, 14-fourth surface, 15-fifth surface, 16-sixth surface, 17-light blocking mechanism, 171-first groove, 172-light shielding material layer, 172a-first edge, 172b-second edge;

[0037] 2- Lens;

[0038] 3-Filter;

[0039] 4- Imaging chip. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0041] In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific examples of processes and materials, but those of ordinary skill in the art may recognize the application of other processes and / or the use of other materials.

[0042] The present application is described below with reference to the accompanying drawings and specific embodiments:

[0043] In order to meet the demand for installing large-aperture telephoto camera modules on small and thin smart terminal devices, an optical path folding prism is usually set in the camera module, between the lens and the imaging chip, so that the light emitted by the lens is reflected multiple times in the prism body and then projected onto the imaging chip, thereby extending the optical path and achieving telephoto.

[0044] However, although the optical path folding prism can extend the optical path, it also increases the light transmission link to a certain extent, which makes it easy for various interference lights to be projected onto the imaging chip after being transmitted through the optical path folding prism, causing glare, and abnormal light and shadows such as injected ghosts and halos appear on the imaging screen, affecting the imaging quality. Among them, when the incident light is at a large angle, part of the large-angle incident light is projected onto the side of the optical path folding prism, that is, the non-pre-designed reflection surface, so as to be reflected from the side to form interference light, which is transmitted through the prism and projected onto the imaging chip to cause glare.

[0045] To this end, the embodiments of the present application provide an optical path folding prism and a camera module, which aim to limit the glare phenomenon caused by interference light formed by large-angle incident light projected onto the side of the optical path folding prism to a certain extent, thereby improving the imaging quality.

[0046] See also Figure 1 and Figure 8 In some embodiments, the optical path folding prism may include a prism body 1 for receiving light emitted from a lens 2, which is reflected multiple times inside the prism body 1 and then projected onto an imaging chip 4 to complete telephoto imaging.

[0047] The prism body 1 is provided with a first surface 11, a second surface 12, a third surface 13, a fourth surface 14 and a fifth surface 15, wherein the first surface 11 can be set as a side receiving the light emitted from the lens 2, the second surface 12 and the third surface 13 can be correspondingly connected to the first surface 11, and the second surface 12 and the third surface 13 can be arranged relatively to each other, so as to cooperate with the first surface 11 to realize multiple reflections of the incident light, and finally emit it from the first surface 11, thereby extending the optical path to a certain extent and realizing the telephoto function.

[0048] The fourth surface 14 and the fifth surface 15 are arranged opposite to each other, and are connected with the first surface 11, the second surface 12 and the third surface 13 respectively, so as to form two side surfaces of the prism body 1; when the incident light is incident on the first surface 11 at a large angle, as the incident angle increases, part of the incident light will be projected onto the first surface 14 or the fifth surface 15, and then will be reflected onto the second surface 12, and further projected onto the first surface 11 and the third surface 13 in sequence, and then emitted from the first surface 11, forming interference light, and forming imaging defects such as light and shadow, ghosting, etc. on the imaging chip 4.

[0049] To this end, the surface roughness of the fourth surface 14 and the fifth surface 15 can be increased to effectively suppress the reflectivity and scatter the light energy, thereby suppressing the interference light reflected by the fourth surface 14 and the fifth surface 15 from affecting the imaging quality; the roughness of the fourth surface 14 and the fifth surface 15 can be specifically set to be greater than 50um to match the reduction of reflection efficiency and weaken the reflection energy, thereby suppressing the influence of the side reflection interference light.

[0050] See also Fig.11 and Fig.12 Based on the comparison of the actual shooting effects of stray light with different roughness, by increasing the roughness of the fourth surface 14 and the fifth surface 15, the glare phenomenon caused by the interference light generated by the large-angle incident light can be fully improved, thereby improving the imaging quality.

[0051] In some embodiments, considering the light transmission function requirements of the optical path folding prism itself, it is impossible to completely seal and block, nor is it possible to absolutely avoid external stray light. Even in the process of imaging light being transmitted inside the prism body 1, it will also be reflected at some angles due to factors such as the operation of the mobile device or the angle of the incident light, and refracted to form endogenous interference light. For this reason, a light blocking mechanism 17 can be provided on the prism body 1 to block both external stray light and endogenous interference light, thereby improving anti-interference ability, reducing the impact of glare, and improving imaging quality.

[0052] See also Figure 1 In some embodiments, in order to realize the light blocking mechanism 17, a sixth surface 16 can be set on the prism body 1, and the sixth surface 16 can be set opposite to the first surface 11, and the sixth surface 16 is respectively connected with the second surface 12, the third surface 13, the fourth surface 14 and the fifth surface 15, so that the prism body 1 forms a hexahedral structure.

[0053] Correspondingly, the light blocking mechanism 17 may include a first groove 171 opened on the sixth surface 16 and a light blocking material located in the first groove 171; wherein, the first groove 171 may extend deep into the prism body 1, and the light blocking material may be coated on the inner wall surface of the first groove 171, or the light blocking material may also be directly filled in the first groove 171 to form a shielding structure with light blocking capability to block the passage of light; thereby blocking the interference light generated by the reflection on the second surface 12 and the third surface 13, avoiding its further reflection and refraction to interfere with the imaging, thereby improving the imaging effect to a certain extent.

[0054] It is worth noting that the depth of the first groove 171 mainly considers the size of the shading area, and is matched to ensure that the first groove 171 and the light-blocking material therein can stably block the interference light; in particular, the interference light reflected from the two stable reflection interfaces of the second surface 12 and the third surface 13, its reflection path and range are relatively stable, and therefore can be stably blocked by the first groove 171 and the light-blocking material therein.

[0055] Of course, the setting of the first groove 171 and the light-blocking material therein should keep the impact on the imaging process at a low level, that is, it should have a small impact on the optical path of the normal imaging light, without blocking or with less blocking; accordingly, the first groove 171 and the light-blocking material therein should be able to fully block the optical path of the interference light; therefore, when specifically setting the depth and width of the first groove 171, the degree of impact on the imaging light and the degree of blocking the interference light can be weighed to achieve a balance between the two.

[0056] Typically, the imaging process of the camera module can be simulated by software, and the width and depth of the first groove 171 can be linearly adjusted, with the width and depth of the first groove 171 ultimately determined in principle based on obtaining better imaging quality.

[0057] It is worth mentioning that the light-blocking effect is also related to the thickness and material selection of the light-blocking material. It can also be adjusted accordingly during the imaging process of the software simulating the camera module to ultimately determine the selection and thickness specifications.

[0058] In some embodiments, the first surface 11 and the sixth surface 16 may be arranged in parallel, and the second surface 12 and the third surface 13 may be connected between the first surface 11 and the sixth surface 16, respectively, to form a relatively regular hexahedral block structure. The second surface 12 and the third surface 13 may form an acute angle with the first surface 11, respectively, to ensure that the second surface 12 can receive and reflect incident light, and at the same time ensure that the light output by the third surface 13 can be stably output from the first surface 11.

[0059] In some embodiments, the prism body 1 can be configured as a regular trapezoidal block, the first surface 11 corresponds to the long base side, the sixth surface 16 corresponds to the short base side, the second surface 12 and the third surface 13 correspond to the two oblique waist sides respectively; the fifth surface 15 and the sixth surface 16 are two side surfaces.

[0060] In some embodiments, the light blocking mechanism 17 may also include a second groove and / or a third groove similar to the first groove 171, which may be respectively arranged on the fourth surface 14 and the fifth surface 15, and light blocking material may be filled in the second groove and the third groove accordingly.

[0061] It can also be combined with the first groove 171 according to actual conditions to synergistically improve the ability to resist stray light interference. Of course, it is also possible to select one from the first groove 171, the second groove and the third groove.

[0062] See also Figure 4 In some embodiments, it is considered that providing a groove on the prism body 1 is likely to destroy the stress distribution inside the prism body 1, thereby increasing the risk of defects such as edge collapse and cracks that are not conducive to light propagation.

[0063] To this end, the prism body 1 can be configured as a plurality of separate parts spliced ​​and bonded together, and a light shielding material can be provided on the bonding surface to realize the light blocking mechanism 17. The following description will be made by taking the form of dividing the prism body 1 into two separate parts as an example; the form of the separate parts is not specifically limited here.

[0064] The prism body 1 may include a first body 1a and a second body 1b that are joined and bonded together, and the two bodies have a surface that can be joined together and is set as a bonding surface, which is used to apply and fill a bonding material to stably bond the first body 1a and the second body 1b together. A light shielding material layer 172 is filled in the gap between the first body 1a and the second body 1b as a functional component of the light shielding mechanism 17, which is used to shield various interference lights in the prism body 1.

[0065] Among them, the shape, shading area, thickness, material selection, etc. of the shading material layer 172 can all be simulated through an imaging simulation experiment of a camera module.

[0066] See also Figure 5 , Figure 6 and Figure 7 The shading material layer 172 can be set into a U-shaped structure, covering the edges of the bonding surfaces of the first split body 1a and the second split body 1b close to the fourth surface 14, the fifth surface 15 and the sixth surface 16, blocking the interfering light incident, refracted and reflected from the second surface 12 and the third surface 13.

[0067] In some embodiments, the shading material layer 172 can be configured to have edges of a U-shaped structure close to the center of the prism body 1, namely, a first edge 172a and a second edge 172b, which can be configured to be straight, wavy or arc-shaped, or a combination of multiple thereof.

[0068] In some embodiments, in order to meet the light transmittance requirement, the adhesive material needs to be a light-transmitting material, and it should be ensured that the effect of the adhesive material on light energy is equivalent to that of the prism body 1. To this end, the refractive index of the adhesive material can be equivalent to that of the prism body 1, so that the change of light passing through the adhesive material is equivalent to that of light passing through the prism body 1.

[0069] In some embodiments, the prism body 1 can be made of glass, that is, an optical glass prism; it has good transmittance and mechanical strength, making it easy to obtain high-quality, stable and precise optical imaging effects.

[0070] In some embodiments, in order to meet the needs of certain special uses, such as high pressure and high temperature environments, the prism body 1 can adopt a quartz crystal prism, which, based on its good mechanical strength, radiation resistance and chemical stability, can meet the use requirements in fields such as photochromatology, laser technology and high-voltage experiments.

[0071] In some embodiments, the prism body 1 can be a lightweight plastic prism made of polymer, which has the characteristics of impact resistance; it can reduce the overall weight of the imaging device to a certain extent, meet the needs of use in certain vibration environments, and maintain the stability of the structure and function of the imaging device.

[0072] It is worth noting that plastic prisms can be made of organic glass prisms or polycarbonate prisms. Organic glass prisms have the advantages of high optical transparency, small dispersion, and high mechanical strength, and can be used instead of glass prisms; polycarbonate prisms have the characteristics of light weight, drop resistance, etc., and are relatively low in cost and have good economic efficiency.

[0073] See also Figure 1 , Figure 2 and Figure 3 In some embodiments, in order to limit stray light from entering the prism body 1, the light blocking mechanism 17 may also include a light blocking film or other light blocking structures, such as a light blocking film, a light blocking coating, etc., arranged on the first surface 11, the second surface 12, the third surface 13, the fourth surface 14, the fifth surface 15 and the sixth surface 16, to block stray light from entering the prism body 1, thereby improving imaging glare and ghost defects.

[0074] It is worth noting that the light-shielding film and the light-shielding coating can be set to a film-shaped structure with a relatively small thickness to avoid causing the thickness of the prism body 1 to be too large in the thickness direction, which affects the assembly. Taking the light-blocking film-shaped structure set on the first surface 11 as an example, a light-blocking film 111 can be set on the first surface 11, and the area blocked by the light-blocking film 111 can be designed accordingly in combination with the imaging light path trajectory of the module, and can block areas outside the coverage area of ​​the imaging light path trajectory, or areas prone to glare. The imaging process of the camera module can be simulated by software, and the blocked area that can suppress the glare phenomenon can be simulated to determine the shape of the light-blocking film 111.

[0075] In some embodiments, the light-blocking film 111 on the first surface 11 may be in the shape of a ring frame as a whole, covering and blocking the entire edge area of ​​the first surface 110, blocking light including stray light; the area within the frame of the light-blocking film 111 is a light-transmitting area, which can be used as an effective area for imaging.

[0076] It is worth noting that the morphological characteristics and specification characteristics of the light-blocking film 111 can be determined through imaging simulation tests, and can also be finally finalized based on the size range, brightness, etc. of light and shadow; setting the light-blocking film 111 can greatly reduce the size and brightness of light and shadow, which helps to reduce the interference of light and shadow on imaging quality.

[0077] Similarly, the second surface 12, the third surface 13, the fourth surface 14, the fifth surface 15 and the sixth surface 16 can also be provided with a light-blocking film structure in the above manner; the first surface 11, the second surface 12, the third surface 13, the fourth surface 14, the fifth surface 15 and the sixth surface 16 can also be flexibly combined, and one or more surfaces are selected to be provided with a light-blocking film with a certain shape, so as to meet the light-blocking requirements under different installation and structural working conditions. Specifically, simulation verification can be carried out according to imaging simulation experiments to determine the specific location for setting the light-blocking film.

[0078] In some embodiments, considering that the light reflection generated by the interface corresponding to the shielding area of ​​the light-blocking film 111 in the prism body 1 will also interfere with the imaging quality to a certain extent, the surface area corresponding to the light-blocking film 111 on the first surface 11 can be increased in roughness by setting it to a frosted surface or a frosted surface, so as to effectively suppress the reflectivity and disperse the light energy, thereby suppressing the interference light reflected at the shielding interface from affecting the imaging quality.

[0079] Similarly, one or more of the surface areas corresponding to the second surface 12, the third surface 13, the fourth surface 14, the fifth surface 15 and the sixth surface 16 covered with the light-blocking film may be set to rough surfaces such as a fogged surface or a frosted surface to effectively suppress the reflectivity and disperse the light energy, thereby suppressing the interference light reflected at the blocking interface from affecting the imaging quality.

[0080] After the interface of the area covered by the light-blocking film 111 is set as a frosted surface, the light and shadow can be reduced to a certain extent, darkened, or even disappeared, thereby helping to improve the adverse effects of light and shadow on imaging.

[0081] In some embodiments, in order to achieve the atomized surface of the first surface 11, the second surface 12 and / or the third surface 13, mechanical grinding, laser ablation or etching and other processes may be used to achieve atomization processing of specific shielding areas.

[0082] In some embodiments, the light-blocking film 11 is mainly used to block light and should have a certain anti-penetration ability. For this purpose, a material with a certain light-absorbing ability and a certain thickness can be selected.

[0083] When the black coating operation is implemented, processes such as silk screen printing, black film coating, etching, etc. can be used; the coating can be coated with a neutral density (ND) laminated filter film.

[0084] It is worth noting that the material selection, process, thickness specification, width specification, etc. of the light-blocking film 11 can be obtained through preliminary simulation tests and then implemented in detail.

[0085] In some embodiments, an anti-reflection and anti-reflection film may be coated on the first surface 11, the second surface 12 and the third surface 13 to further reduce the reflectivity to a certain extent and increase the imaging light transmittance, thereby reducing stray light interference as a whole and improving the imaging quality.

[0086] In some embodiments, considering that the fourth surface 14, the fifth surface 15 and the sixth surface 16 are usually not used as specific incident and reflective interfaces, in order to reduce stray light interference and weaken the influence of reflection, the fourth surface 14, the fifth surface 15 and the sixth surface 16 can be mostly or even entirely covered with a light-blocking film-shaped structure. The rough surface processing of the fourth surface 14 and the fifth surface 15 can be combined to increase the interface roughness, so as to collaboratively control the interference light and shadow defects caused by side reflection.

[0087] See also Figure 8In some embodiments, a camera module is also provided, which is equipped with the above-mentioned optical path folding prism, lens 2 and imaging chip 4, and the lens 2 and the imaging chip 4 are arranged on the same side of the first surface 11, so that the light emitted from the inner lens 2 enters the prism body 1 from the first surface 11, and after multiple reflections, it is emitted from the first surface 11 and projected onto the imaging chip 4.

[0088] In some embodiments, in order to reduce stray light interference with imaging, a filter 3 may be further provided on the light-incoming side of the imaging chip 4 .

[0089] In some embodiments, considering that when a large-angle incident light is incident from the first surface 11, part of the light may be projected onto the fourth surface 14 and the fifth surface 15, thereby being reflected multiple times in the prism body 1 to form interference light, affecting the imaging quality; the width of the prism body 1 can be increased, that is, the distance between the fourth surface 14 and the fifth surface 15 and the light incident area is increased, so that the large-angle incident light cannot be projected onto the fourth surface 14 and the fifth surface 15, thereby greatly reducing the interference light formed by the light reflected from the fourth surface 14 and the fifth surface 15.

[0090] See also Fig.10 By controlling the width comparison test of the prism body 1 and performing a comparison of the stray light actual shooting effect, it can be clearly verified that a larger width helps to improve the influence of stray light and reduce the size and brightness of undesirable light and shadow.

[0091] See also Fig. 9 Generally speaking, in the assembled state, the installation positions of the first surface 11 and the lens 2 are basically fixed, and the area entering through the lens 2 and projected onto the first surface 11 is also roughly fixed. Therefore, the distance H1 between the lens 2 and the first surface 11 is a known range, the thickness H2 of the prism body 1 is known, and the angle range α of the lens 2 that can emit light is also a known range. Therefore, the width range of the incident light projected onto the sixth surface 16 can be obtained by the formula 2tanα·(H1+H2). Therefore, in order to significantly reduce the incident light projected onto the fourth surface 14 and the fifth surface 15, the width of the prism body 1 can be set to be greater than 2tanα·(H1+H2).

[0092] It is worth noting that, of course, it is not necessary to strictly restrict the incident light from being projected onto the fourth surface 14 and the fifth surface 15. The width of the prism body 1 can be modified according to the degree of influence of the side reflected light and shadow, so as to reduce the width, thereby being able to reduce the overall specifications of the prism body 1 to a certain extent, thereby facilitating installation and better adapting to the installation space.

[0093] Generally speaking, the width parameter determined by the above formula can be modified through imaging simulation experiments to obtain appropriate width specifications by comprehensively considering economy, assembly performance and imaging quality.

[0094] In some embodiments, an electronic device equipped with the above-mentioned camera module is also provided, including one or more processors connected to the above-mentioned camera module to process the image signal generated from the camera module.

[0095] The embodiments of the present application have at least the following beneficial effects:

[0096] The optical path folding prism and camera module provided in the embodiments of the present application are provided with a first surface and a second surface and a third surface connected to and arranged opposite to the first surface on the prism body. Incident light can be incident from the first surface and reflected between multiple surfaces of the prism body, and finally emitted from the first surface, thereby realizing optical path folding, extending the optical path, and meeting the needs of telephoto shooting; at the same time, the roughness of the fourth surface and the fifth surface connected to the first surface, the second surface and the third surface is controlled to be above 0.5um, so as to limit the interference light such as reflected or refracted stray light formed by the large-angle incident light from the first surface projected onto the fourth surface and the fifth surface, thereby suppressing the imaging glare phenomenon to a certain extent, suppressing abnormal light and shadow, and improving the imaging quality.

[0097] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0098] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0099] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0100] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0101] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0102] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0103] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0104] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. An optical path folding prism, characterized in that: include: A body, wherein the body is provided with a first surface, a second surface, a third surface, a fourth surface and a fifth surface, the second surface and the third surface are arranged opposite to each other and are respectively connected to the first surface, the fourth surface and the fifth surface are arranged opposite to each other and are respectively connected to the first surface, the second surface and the third surface; The roughness of the fourth surface and the fifth surface is greater than 0.5 um, and the incident light enters from the first surface and is emitted from the first surface after multiple reflections in the body.

2. The optical path folding prism according to claim 1, characterized in that: The main body is provided with a light blocking mechanism to block the interfering light in the main body.

3. The optical path folding prism according to claim 2, characterized in that: The main body is further provided with a sixth surface opposite to the first surface, and the sixth surface is connected with the second surface, the third surface, the fourth surface and the fifth surface respectively; The light blocking mechanism includes a first groove arranged on the sixth surface and a light blocking material arranged in the first groove.

4. The optical path folding prism according to claim 3, characterized in that: The light blocking mechanism further includes a light blocking film disposed on a partial area of ​​one or more of the first surface, the second surface, the third surface, the fourth surface, the fifth surface, and the sixth surface.

5. The optical path folding prism according to claim 4, characterized in that: One or more regions of the first surface, the second surface, the third surface, the fourth surface, the fifth surface, and the sixth surface corresponding to the regions covered with the light-blocking film are configured as a hazed surface.

6. The optical path folding prism according to any one of claims 3 to 5, characterized in that: The light blocking mechanism further includes a second groove arranged on the fifth surface and / or a third groove arranged on the sixth surface and a light blocking material arranged in the second groove and the third groove.

7. The optical path folding prism according to claim 2, characterized in that: The main body comprises two separate parts, and the two separate parts are bonded by a bonding material; The light blocking mechanism comprises a light blocking material layer arranged between the bonding surfaces of the two separate bodies.

8. The optical path folding prism according to claim 7, characterized in that: An edge of one side of the light-blocking material layer close to the center of the main body is configured to be in a straight line shape, a wave shape, an arc shape or a combination of multiple shapes thereof.

9. A camera module, characterized in that: It comprises a lens, an imaging chip and the optical path folding prism as claimed in any one of claims 1 to 8; The lens and the imaging chip are arranged on the same side of the first surface, and the light emitted from the lens enters the light path folding prism from the first surface, and is emitted from the first surface to enter the imaging chip.

10. The camera module according to claim 9, characterized in that: The width of the optical path folding prism is greater than 2tanα·(H1+H2); Wherein, α is the incident angle of the light incident from the first surface, H1 is the distance from the lens to the first surface, and H2 is the thickness of the body.

Images