Optical transmission assembly, camera module and electronic device

Abstract

This application relates to an optical transmission component, a camera module, and an electronic device. The optical transmission component includes: a first prism having a first light-incident surface and a first light-exit surface; and a second prism having a second light-incident surface and a second light-exit surface. The first light-exit surface and the second light-incident surface are opposite to each other and spaced apart to form a first gap. At least a portion of the light rays incident on the first prism from the first light-incident surface can sequentially pass through the first light-exit surface, the light-transmitting portion of the first gap, and the second light-incident surface to enter the second prism, and exit from the second light-exit surface. The refractive index of the medium in the light-transmitting portion of the first gap is less than the refractive index of the first prism, and the first light-exit surface and the second light-incident surface are inclined relative to the first light-incident surface. In the above optical transmission component, the interface between the first prism and the first gap can reflect stray light, achieving the effect of reducing stray light.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of camera technology, in particular to an optical transmission assembly, a camera module and an electronic device. BACKGROUND

[0002] With the rapid development of camera technology, more and more electronic devices such as smart phones, tablet computers and electronic readers are provided with camera modules to realize the camera function. In order to meet the needs of long-distance photography, a periscopic long-focus camera module appears, which reflects and transmits light through a prism, is beneficial to folding the light path, and thus compresses the occupied space of the camera module. However, the prism light path in the camera module with periscopic long-focus design is complex, and it is difficult to eliminate stray light, which affects the imaging quality of the camera module. SUMMARY

[0003] Embodiments of the present application provide an optical transmission assembly, a camera module and an electronic device to solve the problem of difficulty in eliminating stray light in a camera module with periscopic long-focus design.

[0004] An optical transmission assembly comprises:

[0005] a first prism having a first light entrance surface and a first light exit surface;

[0006] a second prism having a second light entrance surface and a second light exit surface, the first light exit surface and the second light entrance surface being oppositely and spacedly arranged to form a first gap, at least part of light rays incident on the first prism from the first light entrance surface being capable of being incident on the second prism in sequence through the first light exit surface, a light-transmitting part of the first gap and the second light entrance surface, and being emitted from the second light exit surface;

[0007] wherein the refractive index of the medium of the light-transmitting part of the first gap is less than the refractive index of the first prism, and the first light exit surface and the second light entrance surface are inclined to the first light entrance surface.

[0008] A camera module comprises a lens, an image sensor and an optical transmission assembly as described above, the lens being opposite to the first light entrance surface, the optical transmission assembly being configured to receive the emitted light of the lens through the first light entrance surface and transmit light rays to the image sensor.

[0009] An electronic device comprises a camera module as described above.

[0010] The optical transmission assembly has the advantages that the refractive index of the medium of the light transmission part of the first gap is less than the refractive index of the first prism, which is favorable for reducing the total reflection critical angle of the light rays from the first prism to the interface between the first prism and the first gap, so that the total reflection of the light rays is more likely to occur at the interface between the first prism and the first gap. In addition, the first light-out surface and the second light-in surface are inclined to the first light-in surface, which is favorable for reducing the incident angle of the imaging light rays at the interface between the first prism and the first gap, reducing the reflection probability of the imaging light rays at the interface between the first prism and the first gap, reducing the influence of the first gap on the light transmission function of the optical transmission assembly, and increasing the incident angle of the stray light at the interface between the first prism and the first gap, improving the total reflection probability of the stray light at the interface between the first prism and the first gap, so that the effect of reducing the stray light is achieved. In addition, the stray light is reduced by the design of the first gap between the first light-out surface and the second light-in surface, and the design of the stray light is closely combined with the structure of the optical transmission assembly, so that the occupied space of the optical transmission assembly is not increased, and the size of the optical transmission assembly is compressed. BRIEF DESCRIPTION OF DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0012] Figure 1 The structure schematic diagram of the electronic device in some embodiments.

[0013] Figure 2 The structure schematic diagram of the camera module in some embodiments.

[0014] Figure 3 The schematic diagram of the transmission path of the partial stray light of the camera module in some embodiments.

[0015] Figure 4 The structure schematic diagram of the camera module in some embodiments. Figure 3 The structure schematic diagram of the camera module in some embodiments.

[0016] Figure 5 The structure schematic diagram of the camera module in some embodiments.

[0017] Figure 6 The structure schematic diagram of the optical transmission assembly in some embodiments.

[0018] Figure 7 The structure schematic diagram of the optical transmission assembly in some embodiments.

[0019] Figure 8 Structure diagram of some embodiments in which the light passing portion of the first gap and the second gap employs air medium.

[0020] Figure 9 Structure diagram of some embodiments in which the electronic device includes other elements. Figure 8 Structure diagram of some embodiments in which the electronic device includes other elements.

[0021] Figure 10 Structure diagram of some embodiments in which the electronic device includes other elements.

[0022] Reference signs:

[0023] 10, electronic device; 11, housing; 111, light inlet hole; 20, camera module; 21, lens; 22, image sensor; 30, optical transmission assembly; 31, first prism; 311, first light inlet surface; 312, first light outlet surface; 313, first reflection surface; 314, first top surface; 32, second prism; 321, second light inlet surface; 322, second light outlet surface; 323, second reflection surface; 324, second top surface; 325, first gap; 33, third prism; 331, third light inlet surface; 332, third light outlet surface; 333, third reflection surface; 334, third top surface; 335, second gap; 34, light transmission adhesive structure; 35, light shielding structure; 36, adhesive structure. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present application can be more thoroughly and completely understood.

[0025] As used herein, "electronic device" refers to, but is not limited to, a device capable of receiving and / or transmitting communication signals via any one or more of the following connection means:

[0026] (1) via wired connection means, such as via Public Switched Telephone Networks (PSTN), Digital Subscriber Line (DSL), digital cable, direct cable connection;

[0027] (2) via a wireless interface, such as a cellular network, a Wireless Local Area Network (WLAN), a digital television network such as a DVB-H network, a satellite network, an AM-FM radio transmitter.

[0028] Electronic devices configured to communicate over a wireless interface can be referred to as "mobile terminals." Examples of mobile terminals include, but are not limited to, the following electronic devices:

[0029] (1) a satellite telephone or a cellular telephone;

[0030] (2) a Personal Communications System (PCS) terminal that can combine a cellular radiotelephone with data processing, facsimile, and data communications capabilities;

[0031] (3) a radiotelephone, a pager, Internet / Intranet access, a Web browser, a notepad, a calendar, a Personal Digital Assistant (PDA) equipped with a Global Positioning System (GPS) receiver;

[0032] (4) a conventional laptop and / or palmtop receiver;

[0033] (5) a conventional laptop and / or palmtop radiotelephone transceiver, etc.

[0034] See, for example, Figure 1 and Figure 2 Figure 1 and Figure 2 ​Structural diagrams of an electronic device 10 and a camera module 20 in some embodiments of the present application are shown respectively. The electronic device 10 provided by the present application includes but is not limited to a smartphone, a tablet computer, an e-reader, etc. The electronic device 10 includes a housing 11 and a camera module 20 arranged in the housing 11. The housing 11 is provided with a light inlet hole 111. The camera module 20 includes a lens 21, an image sensor 22, and an optical transmission assembly 30. The lens 21 is opposite to the light inlet hole 111 and can collect ambient light through the light inlet hole 111. The optical transmission assembly 30 can transmit the light collected by the lens 21 to the image sensor 22. The image sensor 22 is used to convert the received light signal into an electrical signal and transmit it to a central processing unit of the electronic device 10 or a chip specially used for image processing in the electronic device 10, so that the electronic device 10 can realize the camera function. The lens 21 can include one or more lenses. The light incident on the lens 21 from the light inlet hole 111 can be emitted after being adjusted by each lens of the lens 21 in turn. The image sensor 22 includes but is not limited to a Charge-coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS).

[0035] In combination with Figure 2 and Figure 3 As shown in the drawings, in some embodiments, the light is emitted after one or more reflections in the optical transmission assembly 30, that is, the optical transmission assembly 30 can also change the transmission path of the light during the transmission of the light, realize the effect of folding the optical path, and help to compress the occupied space of the camera module 20. It should be noted that the optical transmission assembly 30 is used to transmit the light reflected by the object to be photographed to the image sensor 22. In the present application, this part of light is referred to as imaging light, Figure 2 The dashed arrow shown in the drawing schematically shows the transmission path of the chief ray of the imaging light in the camera module 20.

[0036] The conventional optical transmission assembly usually also transmits part of the stray light to the image sensor, affecting the imaging quality of the camera module. The stray light can be derived from the sunlight or other strong light sources in the environment, or from the reflection and scattering of the internal structure of the lens and the optical transmission assembly. In order to reduce the stray light and reduce the influence of the stray light on the imaging quality of the camera module, the conventional optical transmission assembly usually slots the prism surface and fills the light-absorbing substance to reduce the stray light. However, in order to avoid the slot affecting the transmission of the imaging light in the optical transmission assembly, the depth of the slot is usually shallow and cannot cover the stray light transmission path inside the optical transmission assembly. It is difficult to reduce the stray light inside the optical transmission assembly, which is not conducive to the improvement of the imaging quality.

[0037] In order to solve the above problems, in combination withFigure 2 、 Figure 3 and Figure 4 In some embodiments, the optical conducting assembly 30 comprises a first prism 31 having a first light entrance surface 311 and a first light exit surface 312, and a second prism 32 having a second light entrance surface 321 and a second light exit surface 322, the first light exit surface 312 and the second light entrance surface 321 are oppositely and spacedly arranged to form a first gap 325, and the first light exit surface 312 and the second light entrance surface 321 can be substantially parallel. At least part of the light rays incident on the first prism 31 from the first light entrance surface 311 can be sequentially incident on the second prism 32 from the first light exit surface 312, a light-transmitting portion of the first gap 325, and the second light entrance surface 321, and exit from the second light exit surface 322, and the light rays can be reflected one or more times in the first prism 31 and the second prism 32. The light-transmitting portion of the first gap 325 can be understood as a portion of the first gap 325 corresponding to the imaging light rays passing through, and the position of the light-transmitting portion in the first gap 325 can be set according to the optical path design of the optical conducting assembly 30, as long as the imaging light rays can pass through the light-transmitting portion of the first gap 325 between the first light exit surface 312 and the second light entrance surface 321. The refractive index of the medium in the light-transmitting portion of the first gap 325 is less than the refractive index of the first prism 31, and the first light exit surface 312 and the second light entrance surface 321 are inclined to the first light entrance surface 311. When the light rays pass through the light-transmitting portion of the first gap 325, they pass through the medium in the light-transmitting portion of the first gap 325, for example, the light rays can exit from the first light exit surface 312 between the first light exit surface 312 and the medium in the light-transmitting portion of the first gap 325, and enter the second prism 32 from the medium in the light-transmitting portion of the first gap 325 and the second light entrance surface 321.

[0038] In combination with Figure 2 and Figure 3It can be seen that when the imaging light rays are reflected once or more times in the first prism 31 and then reach the interface between the first light exit surface 312 and the first gap 325, due to the fact that the first light exit surface 312 and the second light entrance surface 321 are inclined to the first light entrance surface 311, the incidence angle of the imaging light rays at the interface between the first light exit surface 312 and the first gap 325 is not too large, and the imaging light rays are not easy to be reflected at the interface between the first light exit surface 312 and the first gap 325, and can be transmitted through the first gap 325 and the second light entrance surface 321 to the second prism 32. Taking one of the stray light beams that reach the middle part of the first light exit surface 312 as an example, the incidence angle of the stray light at the interface between the first light exit surface 312 and the first gap 325 is usually much larger than the incidence angle of the imaging light rays. In combination with the design that the refractive index of the medium of the light transmission part of the first gap 325 is smaller than the refractive index of the first prism 31, the stray light is transmitted from the optically dense medium of the first prism 31 to the optically sparse medium of the first gap 325, and the stray light is easy to be totally reflected at the interface between the first light exit surface 312 and the first gap 325 and deviate from the first light exit surface 312, for example, from the first light entrance surface 311 to the first prism 31, thereby achieving the effect of reducing stray light. It can be seen that the means of reducing stray light through the design of the angle and refractive index of the first gap 325 is not limited to the incidence position of the stray light on the first light exit surface 312, and can also reduce the stray light located in the middle part of the first prism 31, thereby effectively improving the imaging quality of the camera module 20.

[0039] The optical transmission assembly 30 is provided with the first gap 325, the refractive index of the medium of the light transmission part of the first gap 325 is less than the refractive index of the first prism 31, which is conducive to reducing the total reflection critical angle of the light rays from the first prism 31 to the interface between the first prism 31 and the first gap 325, so that the light rays are more likely to be totally reflected at the interface between the first prism 31 and the light transmission part of the first gap 325. In addition, the first light-out surface 312 and the second light-in surface 321 are inclined to the first light-in surface 311, which is conducive to reducing the incidence angle of the imaging light rays on the interface between the first prism 31 and the first gap 325, reducing the reflection probability of the imaging light rays on the interface between the first prism 31 and the first gap 325, reducing the influence of the first gap 325 on the light transmission function of the optical transmission assembly 30, and at the same time, it is also conducive to increasing the incidence angle of stray light on the interface between the first prism 31 and the first gap 325, cooperating with the design of the refractive index of the medium of the light transmission part of the first gap 325, and improving the total reflection probability of the stray light on the interface between the first prism 31 and the first gap 325, thereby achieving the effect of reducing stray light. In addition, the first gap 325 between the first light-out surface 312 and the second light-in surface 321 is designed to reduce stray light, and the design of reducing stray light is closely combined with the structure of the optical transmission assembly 30, which does not increase the occupied space of the optical transmission assembly 30, and is conducive to compressing the size of the optical transmission assembly 30.

[0040] In some embodiments, at least part of the first light-out surface 312 and the second light-in surface 321 are adhered, that is, the first prism 31 and the second prism 32 are glued, so that the optical transmission assembly 30 provided by the present application can achieve the effect of reducing stray light by splitting one prism into two first prisms 31 and second prisms 32 that are glued together, and by designing the refractive index and angle of the first gap 325 between the first prism 31 and the second prism 32. Thus, the design of reducing stray light is closely combined with and highly integrated with the prism structure of the optical transmission assembly 30, and does not increase the occupied space of the optical transmission assembly 30.

[0041] In some embodiments, the optical transmission component 30 satisfies the condition: arcsin(n2 / n1) ≤ π / 2 - a; where n1 is the refractive index of the first prism 31, n2 is the refractive index of the medium in the light-transmitting portion of the first gap 325, and a is the radian of the angle between the first emitting surface 312 and the first incident surface 311. π / 2 - a represents the incident angle of stray light parallel to the first incident surface 311 on the first emitting surface 312, for example, the incident angle of stray light incident on the first emitting surface 312 at the center position of the first incident surface 311. When the above condition is satisfied, the incident angles of stray light parallel to the first incident surface 311 and stray light incident on the first emitting surface 312 at a larger incident angle are both greater than the critical angle for total internal reflection, which increases the probability of total internal reflection of stray light on the first emitting surface 312 and improves the effect of stray light reduction.

[0042] Combination Figure 2 and Figure 4 As shown, in some embodiments, the optical transmission component 30 further includes a light-transmitting adhesive structure 34. The light-transmitting adhesive structure 34 is disposed in the first gap 325 to form a medium for the light-transmitting portion of the first gap 325. The first light-emitting surface 312 and the second light-incident surface 321 are respectively bonded to both sides of the light-transmitting adhesive structure 34. The light-transmitting adhesive structure 34, which has a refractive index lower than that of the first prism 31, not only forms a light-transmitting medium for the light-transmitting portion of the first gap 325, but also serves as an adhesive material between the first prism 31 and the second prism 32, increasing the bonding area between the first prism 31 and the second prism 32. This is beneficial to improving the reliability of the bonding between the first prism 31 and the second prism 32, thereby improving the structural strength of the optical transmission component 30.

[0043] In some embodiments, the optical conduction assembly 30 further comprises a light shielding structure 35 arranged in the first gap 325 and surrounding the light-transmissive adhesive structure 34, that is, the light shielding structure 35 is arranged in the area outside the light transmission part of the first gap 325 corresponding to the imaging light. The light shielding structure 35 includes but is not limited to any applicable light shielding material such as silk printing, light shielding medium film, etc. The light shielding structure 35 arranged in the area outside the light transmission part has better light shielding effect, can effectively absorb, scatter or reflect the stray light incident on the area outside the light transmission part, improve the effect of reducing stray light of the camera module 20, and thus is conducive to improving the imaging quality of the camera module 20. Of course, in other embodiments, the light-transmissive adhesive structure 34 can also fill the entire first gap 325, that is, fill the area outside the light transmission part and the light transmission part, so as to further increase the bonding area of the first prism 31 and the second prism 32 and improve the structural reliability of the optical conduction assembly 30. When the light-transmissive adhesive structure 34 fills the entire first gap 325, the optical conduction assembly 30 can also be provided with a light shielding structure 35 in the area outside the light transmission part of the first gap 325 to improve the effect of reducing stray light. The light shielding structure 35 can be arranged on the part of the light-transmissive adhesive structure 34 outside the light transmission part, for example, stacked on the light-transmissive adhesive structure 34.

[0044] In combination with Figure 4 and Figure 5 In some embodiments, the first prism 31 further has a first reflection surface 313, and the first reflection surface 313 and the first light-out surface 312 are both inclined to the first light-in surface 311. The imaging light incident on the first prism 31 from the first light-in surface 311 can be reflected by the first reflection surface 313 and then emitted from the first light-out surface 312. It can be understood that when the first prism 31 is provided with the first reflection surface 313 to reflect and conduct the imaging light, the stray light from the sun or other strong light sources from the outside can also be reflected by the first reflection surface 313 and then incident on the middle part of the first light-out surface 312, for example Figure 4 and Figure 5 The conductive path of the stray light is shown by the dotted arrows in the figure. By designing the medium refractive index and angle of the first gap 325, the total reflection probability of the part of stray light on the first light-out surface 312 can be improved, and the problem that the traditional camera module cannot reduce the stray light in the middle part is solved.

[0045] Further, referring to Figure 2In some embodiments, the optical transmission assembly 30 further includes a third prism 33 having a third light-in surface 331 and a third light-out surface 332, the third light-in surface 331 and the second light-out surface 322 are oppositely and spacedly arranged to form a second gap 335, at least part of the light rays emitted from the second prism 32 can sequentially pass through the light-transmitting part of the second gap 335 and the third light-in surface 331 and be incident on the third prism 33 from the third light-out surface 332. The refractive index of the medium of the light-transmitting part of the second gap 335 is less than the refractive index of the second prism 32, the second light-out surface 322 and the third light-in surface 331 are inclined to the first light-in surface 311, and at least part of the second light-out surface 322 and the third light-in surface 331 can be adhesively arranged. The optical transmission assembly 30 is divided into three prisms that are adhesively arranged, and the refractive index and the angle of the first gap 325 and the second gap 335 formed by the three prisms are designed so that the first gap 325 and the second gap 335 can reduce stray light twice, for example Figure 3 The dashed arrow shows the stray light transmission path. When the light rays that are not reduced by the first gap 325 are emitted from the second prism 32 to the junction of the second light-out surface 322 and the second gap 335, the second gap 335 can reduce the part of the stray light again, effectively improving the reduction effect of the stray light, thereby improving the imaging quality of the camera module 20.

[0046] In some embodiments, the second prism 32 further has a second reflection surface 323 connecting the second light-in surface 321 and the second light-out surface 322, the first light-in surface 311 and the third light-out surface 332 are parallel, and the second reflection surface 323 is partially opposite to the first light-in surface 311 and the third light-out surface 332, respectively. The third prism 33 further has a third reflection surface 333, and the third light-in surface 331 and the third reflection surface 333 are both inclined to the third light-out surface 332. At least part of the light rays incident on the first prism 31 from the first light-in surface 311 can be reflected by the first reflection surface 313 and the first light-in surface 311 in sequence, then be incident on the second prism 32 through the first light-out surface 312, the light-transmitting part of the first gap 325, and the second light-in surface 321 in sequence. At least part of the light rays incident on the second prism 32 can be reflected by the second reflection surface 323 and then be incident on the third prism 33 through the second light-out surface 322, the light-transmitting part of the second gap 335, and the third light-in surface 331 in sequence. The light rays incident on the third prism 33 can be reflected by the third light-out surface 332 and the third reflection surface 333 in sequence and then be emitted from the third light-out surface 332. Thus, by reasonably designing the structure of the three prisms, the light rays can be reflected five times in the optical transmission assembly 30, effectively prolonging the transmission path of the light rays in the optical transmission assembly 30, effectively realizing the effect of folding the optical path, adapting to the long-focus design of the lens 21, and at the same time being conducive to compressing the occupied space of the camera module 20. At the same time, the light rays can be reflected by the first reflection surface 313, the second reflection surface 323, and the third reflection surface 333 in sequence, and then be emitted from the third light-out surface 332, thereby effectively reducing the loss of the light rays. Figure 2The conduction path of the imaging light rays shown can also be seen that the first light exit surface 312 and the second light exit surface 322 are inclined to the first light entrance surface 311, and the first light exit surface 312 and the first light entrance surface 311 form an acute angle, and the second light exit surface 322 and the first light entrance surface 311 form an obtuse angle. The design can cooperate with the design of the five-reflection conduction path of the optical conduction assembly 30, effectively reduce the incidence angle of the imaging light rays when the imaging light rays are incident on the first light exit surface 312 and the second light exit surface 322, reduce the reflection probability of the imaging light rays on the first light exit surface 312 and the second light exit surface 322, and thus reduce the influence of the first gap 325 and the second gap 335 on the conduction of the imaging light rays.

[0047] The prisms involved in the present application include but are not limited to optical elements made of plastic or glass, and the materials and refractive indexes of the prisms can be the same or different. In some embodiments, the angle between the first light entrance surface 311 and the first reflection surface 313, and the angle between the third reflection surface 333 and the third light exit surface 332 are both 27°-33°, for example, 30°, and the angle between the second light entrance surface 321 and the second light exit surface 322 is an obtuse angle. In this way, the structure of the optical conduction assembly 30 can be reasonably planned, so that the structural design of the optical conduction assembly 30 can adapt to the five-reflection path of the imaging light rays and the reflection of the first gap 325 and the second gap 335 on stray light, effectively reducing stray light without affecting the conduction of the imaging light rays.

[0048] In some embodiments, the angle between the first light exit surface 312 and the first light entrance surface 311 is 30°-45°, and the acute angle between the second light exit surface 322 and the plane where the first light entrance surface 311 is located can also be 30°-45°, to adapt to the conduction path of the imaging light rays, reduce the influence of the first gap 325 and the second gap 335 on the conduction process of the imaging light rays, and at the same time increase the incidence angle of stray light on the first light exit surface 312 and the second light exit surface 322, improve the reflection probability of stray light, and thus improve the effect of reducing stray light.

[0049] In some embodiments, the optical conduction assembly 30 satisfies: n1 / n2≥1.22. According to the calculation formula of the critical angle of total reflection, when the above condition is satisfied, the stray light incident on the first light exit surface 312 can be totally reflected on the first light exit surface 312 when the exit angle of the stray light on the first light exit surface 312 is greater than or equal to 45°, thereby being reduced, and thus can cooperate with the angle range between the first light exit surface 312 and the first light entrance surface 311 to effectively reduce most of the stray light and improve the reduction effect of the stray light. In some embodiments, the optical conduction assembly 30 satisfies: 1.6≤n1≤2.2; 1.3≤n2≤1.6, for example, the refractive index of the first prism 31 can be 2.05, and the refractive index of the medium of the light transmission part of the first gap 325 can be 1.4. In some embodiments, the vertical distance between the first light exit surface 312 and the second light entrance surface 321, i.e., the medium thickness of the light transmission part of the first gap 325, is 1.5um-15um, which can provide a sufficient distance for the reflection of stray light and also reduce the influence of the setting of the first gap 325 on the structural reliability and volume of the optical conduction assembly 30. It should be noted that the relationship between the refractive index of the second prism 32 and the medium of the light transmission part of the second gap 335 can be obtained by referring to the refractive index of the first prism 31 and the medium of the light transmission part of the first gap 325, the angle relationship between the second light exit surface 322 and the third light exit surface 332 and the third light exit surface 332 can be obtained by referring to the angle relationship between the first light exit surface 312 and the first light entrance surface 311, and the medium thickness of the light transmission part of the second gap 335 can also be obtained by referring to the medium thickness of the light transmission part of the first gap 325, as long as the second gap 335 can also reduce at least part of the stray light by total reflection. In this application, it is not described in detail.

[0050] It should be noted that, Figure 2 and Figure 3 are only examples of the optical path and structure design of the optical conduction assembly 30 in some embodiments of the present application, and Figure 2 and Figure 3 the embodiments shown in the drawings, the optical conduction assembly 30 includes three prisms that are glued together and forms a first gap 325 and a second gap 335, and the light rays occur five times in the optical conduction assembly 30. Referring to Figure 5As shown, in some embodiments, the optical transmission component 30 may also consist of two prisms, with a first gap 325 formed between the first prism 31 and the second prism 32. Depending on the different designs of the size and angle of the first prism 31 and the second prism 32, the imaging light can be emitted after undergoing two, four, or other numbers of reflections within the optical transmission component 30. Of course, the optical transmission component 30 may also include other numbers of prisms to form other numbers of gaps, as long as the design of the refractive index and angle of the gap medium between adjacent prisms can reduce stray light without affecting the transmission of the imaging light. This will not be elaborated upon in this application.

[0051] refer to Figure 6 As shown, in some embodiments, the second light-incident surface 321 and the second light-exiting surface 322 are connected, so the second prism 32 can be approximately triangular in shape, with the second light-incident surface 321, the second light-exiting surface 322, and the second reflecting surface 323 being the three sides of the second prism 32. (Reference) Figure 7 As shown, in some embodiments, the second light-incident surface 321 and the second light-exiting surface 322 are spaced apart. The second prism 32 further includes a second top surface 324 connected to the second light-incident surface 321 and the second light-exiting surface 322 and opposite to the second reflecting surface 323. In this case, the second prism 32 can be approximately in the shape of a trapezoidal prism, with the second top surface 324 and the second reflecting surface 323 corresponding to the top and bottom surfaces of the trapezoid, respectively. In some embodiments, the second top surface 324 is coplanar with the first light-incident surface 311 and the third light-exiting surface 332, which helps to improve the compactness and regularity of the optical transmission component 30 structure and facilitates the assembly of the optical transmission component 30.

[0052] refer to Figure 6 As shown, in some embodiments, the first reflecting surface 313 is connected to the first light-emitting surface 312, and the third light-incident surface 331 is connected to the third reflecting surface 333. Therefore, both the first prism 31 and the second prism 32 can be approximately triangular prisms. (Reference) Figure 7As shown, in some embodiments, the first reflecting surface 313 is spaced apart from the first emitting surface 312. The first prism 31 further includes a first top surface 314 connected to the first reflecting surface 313 and the first emitting surface 312. The third incident surface 331 is spaced apart from the third reflecting surface 333. The third prism 33 further includes a third top surface 334 connected to the third incident surface 331 and the third reflecting surface 333. Thus, the first prism 31 and the third prism 33 can generally be in the shape of a quadrangular prism with a trapezoidal cross-section. In some embodiments, the first top surface 314, the second reflecting surface 323, and the third top surface 334 are coplanar, which helps to improve the compactness and regularity of the optical transmission component 30 structure and facilitates the assembly of the optical transmission component 30. Of course, the specific shapes of the first prism 31, the second prism 32 and the third prism 33 can be designed according to the length of the transmission path of the imaging light and the angle between the first light-emitting surface 312, the second light-emitting surface 322 and the first light-incident surface 311, as long as they can achieve the corresponding functions of guiding light and reducing stray light.

[0053] Please see Figure 8 and Figure 9 As shown, in some other embodiments provided in this application, the light-transmitting portion of the first gap 325 can be an air medium. The optical transmission component 30 may further include an adhesive structure 36, which is disposed in the first gap 325 and surrounds the light-transmitting portion of the first gap 325, i.e., the adhesive structure 36 surrounds the air medium of the first gap 325. The first light-emitting surface 312 and the second light-incident surface 321 are respectively adhered to both sides of the adhesive structure 36. The adhesive structure 36 achieves the adhesion of the first prism 31 and the second prism 32, and makes the light-transmitting portion of the first gap 325 form an air medium. The refractive index of the air medium is close to 1, which has a greater refractive index difference with the first prism 31. This effectively reduces the critical angle of total internal reflection between the first light-emitting surface 312 and the air medium, increasing the probability of stray light undergoing total internal reflection on the first light-emitting surface 312, thereby further improving the effect of stray light reduction. In this embodiment, the adhesive structure 36 can be made of a light-shielding material, such as black adhesive, etc., so that the adhesive structure 36 can effectively absorb stray light outside the light-transmitting portion of the first gap 325, thereby improving the stray light reduction effect. Of course, the adhesive structure 36 can also be a light-transmitting adhesive such as optical adhesive, and the optical transmission component 30 can also include a light-shielding structure 35 such as screen printing or a light-shielding medium film. The light-shielding structure 35 is disposed in the first gap 325 and surrounds the light-transmitting portion of the first gap 325. The light-shielding structure 35 can be stacked with the adhesive structure 36, and can also absorb stray light outside the light-transmitting portion of the first gap 325.

[0054] exist Figure 8 and Figure 9In the shown embodiment, the medium of the light passing portion of the second gap 335 and the structure outside the light passing portion can be obtained by referring to the first gap 325, and the medium of the light passing portion of the first gap 325 and the second gap 335 can be the same or different, for example, the medium of the light passing portion of the first gap 325 and the second gap 335 can be air medium and light-transmitting adhesive structure 34 respectively.

[0055] Reference Figure 10 , Figure 10 A structural schematic diagram of an electronic device 10 provided by an embodiment of the present application is shown. The electronic device 10 can include a radio frequency (RF) circuit 501, a memory 502 including one or more computer readable storage media, an input unit 503, a display unit 504, a sensor 505, an audio circuit 506, a wireless fidelity (WiFi) module 507, a processor 508 including one or more processing cores, and a power supply 509, and the like. Those skilled in the art can understand that the electronic device 10 shown in the figure is not a limitation on the electronic device 10, and the electronic device 10 can include more or fewer components than shown, or combine certain components, or different component arrangements. Figure 10 The structure of the electronic device 10 shown in the figure does not constitute a limitation on the electronic device 10, and the electronic device 10 can include more or fewer components than shown, or combine certain components, or different component arrangements.

[0056] The radio frequency circuit 501 can be used for transmitting and receiving information, or receiving and sending signals in the process of communication. In particular, after receiving the downlink information from the base station, the radio frequency circuit 501 delivers the information to the one or more processors 508 for processing. In addition, the radio frequency circuit 501 sends the uplink data to the base station. Generally, the radio frequency circuit 501 includes, but is not limited to, an antenna, at least one amplifier, a tuner, one or more oscillators, a Subscriber Identity Module (SIM) card, a transceiver, a coupler, a Low Noise Amplifier (LNA), a duplexer, and the like. In addition, the radio frequency circuit 501 can communicate with a network and other devices through wireless communication. The wireless communication can use any communication standards or protocols, including but not limited to Global System for Mobile Communication (GSM), General Packet Radio Service (GPRS), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Long Term Evolution (LTE), email, Short Messaging Service (SMS), and the like.

[0057] The memory 502 can be used to store applications and data. The memory 502 stores executable codes in the application programs. The application programs can constitute various functional modules. The processor 508 executes various functional applications and data processing by running the application programs stored in the memory 502. The memory 502 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application program required by a function (such as a sound playing function, an image playing function, and the like), and the like; the data storage area can store data (such as audio data, a phone book, and the like) created according to the use of the electronic device 10, and the like. In addition, the memory 502 can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other volatile solid-state memory device. Accordingly, the memory 502 can also include a memory controller to provide the processor 508 and the input unit 503 with access to the memory 502.

[0058] The input unit 503 can be configured to receive input of numbers, character information, or user-specific information (e.g., a fingerprint), and to generate a signal input related to user settings and function control, such as a keyboard, a mouse, a joystick, an optical or trackball. Specifically, in one embodiment, the input unit 503 can include a touch-sensitive surface and other input devices. The touch-sensitive surface, also known as a touch display or a touchpad, can collect touch operations (e.g., operations of a user using a finger, a stylus, or any suitable object or accessory on or near the touch-sensitive surface) on or near the touch-sensitive surface and drive corresponding connection devices according to a pre-set program. Optionally, the touch-sensitive surface can include two parts, a touch detection device and a touch controller. The touch detection device detects the touch position of the user and detects signals caused by touch operations, and transmits the signals to the touch controller. The touch controller receives the touch information from the touch detection device, converts it into touch coordinates, and sends it to the processor 508, and can also receive commands from the processor 508 and execute them.

[0059] The display unit 504 can be configured to display information input by a user or information provided to a user, as well as various graphical user interfaces of the electronic device 10, which can be composed of graphics, text, icons, video, and any combination thereof. The display unit 504 can include a display panel. Optionally, the display panel can be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), or the like. Further, the touch-sensitive surface can cover the display panel, and when the touch-sensitive surface detects a touch operation on or near it, it transmits to the processor 508 to determine the type of touch event, and then the processor 508 provides corresponding visual output on the display panel according to the type of touch event. Although in the above description, the touch-sensitive surface and the display panel are implemented as two independent components to achieve input and output functions, in some embodiments, the touch-sensitive surface and the display panel can be integrated to achieve input and output functions. Figure 10

[0060] ​The electronic device 10 can also include at least one sensor 505, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor can include an ambient light sensor and a proximity sensor, wherein the ambient light sensor can adjust the brightness of the display panel according to the brightness of ambient light, and the proximity sensor can turn off the display panel and / or the backlight when the electronic device 10 is moved to the ear. As one of the motion sensors, the gravity acceleration sensor can detect the magnitude of acceleration in each direction (generally three axes), and when at rest, it can detect the magnitude and direction of gravity, which can be used for applications such as identifying the posture of the mobile phone (such as switching between horizontal and vertical screens, related games, and magnetometer posture calibration), vibration recognition related functions (such as pedometers and tapping), and the like. As for other sensors that the electronic device 10 can also be configured, such as a gyroscope, a barometer, a hygrometer, a thermometer, an infrared sensor, and the like, they will not be described here.

[0061] The audio circuit 506 can provide an audio interface between the user and the electronic device 10 through the speaker and the microphone. The audio circuit 506 can convert received audio data into an electrical signal and transmit it to the speaker for conversion into a sound signal output by the speaker. On the other hand, the microphone collects sound signals and converts them into electrical signals, which are received by the audio circuit 506 and converted into audio data. The audio data is then processed by the processor 508 and output to the radio frequency circuit 501 for transmission to another electronic device 10, for example, or to the memory 502 for further processing. The audio circuit 506 can also include a headset jack to provide communication between an external headset and the electronic device 10.

[0062] Wireless Fidelity (WiFi) is a short-range wireless transmission technology. The wireless Fidelity module 507 can help the user to send and receive emails, browse web pages, and access streaming media, and provides the user with wireless broadband Internet access. Although Figure 10 The wireless Fidelity module 507 is shown, but it is understood that it does not belong to the essential components of the electronic device 10, and can be omitted as needed without changing the essence of the application.

[0063] The processor 508 is the control center of the electronic device 10, which connects all parts of the electronic device 10 through various interfaces and lines, executes various functions of the electronic device 10 and processes data by running or executing application programs stored in the memory 502 and calling data stored in the memory 502, and thus monitors the entire electronic device 10. Optionally, the processor 508 can include one or more processing cores; preferably, the processor 508 can integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, the user interface, and the application program, and the modem processor mainly processes wireless communication. It can be understood that the above-mentioned modem processor can also not be integrated into the processor 508.

[0064] The electronic device 10 also includes a power supply 509 for powering the various components. Preferably, the power supply 509 is logically connected to the processor 508 through a power management system, such that the power management system enables functions such as management of charging, discharging, and power consumption management. The power supply 509 can also include one or more DC or AC power sources, recharging systems, power failure detection circuitry, power converters or inverters, power status indicators, and the like.

[0065] Although Figure 10 The electronic device 10 can also include a Bluetooth module or the like, which is not shown in the figure, and will not be described here. In practice, the various modules described above can be implemented as independent entities, or can be combined in any manner as the same or several entities. The implementation of the various modules described above can be found in the method embodiments described above, and will not be described here.

[0066] The various technical features of the embodiments described above can be combined in any manner. In order to make the description simple, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combinations of the technical features do not contradict each other, they should be considered as falling within the scope of the present disclosure.

[0067] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all fall within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. An optical transmission assembly, characterized by, The optical transmission assembly comprises: a first prism having a first light entrance surface and a first light exit surface; a second prism having a second light entrance surface and a second light exit surface, the first light exit surface and the second light entrance surface being oppositely and spacedly arranged to form a first gap, at least part of light rays incident on the first prism from the first light entrance surface being capable of being sequentially incident on the second prism via the first light exit surface, a light-transmitting part of the first gap, and the second light entrance surface, and being emitted from the second light exit surface, an included angle between the first light exit surface and the first light entrance surface being 30°-45°; wherein a refractive index of a medium of the light-transmitting part of the first gap is less than a refractive index of the first prism, and the first light exit surface and the second light entrance surface are inclined to the first light entrance surface; the optical transmission assembly satisfies the following conditions: n1 / n2≥1.22; 1.6≤n1≤2.2； 1.3≤n2≤1.6； arcsin(n2 / n1)≤π / 2-a; wherein n1 is the refractive index of the first prism, n2 is the refractive index of the medium of the light-transmitting part of the first gap, and a is an arc of the included angle between the first light exit surface and the first light entrance surface.

2. The optical transmission assembly of claim 1, wherein, The optical transmission assembly further comprises a bonding structure arranged in the first gap and surrounding the light-transmitting part of the first gap, two sides of the bonding structure being bonded to the first light exit surface and the second light entrance surface respectively.

3. The optical transmission assembly of claim 2, wherein, The bonding structure is made of light-shielding material.

4. The optical transmission assembly of claim 2, wherein, The optical transmission assembly further comprises a light-shielding structure arranged in the first gap and surrounding the light-transmitting part of the first gap.

5. The optical transmission assembly of claim 1, wherein, The optical transmission assembly further comprises a light-transmitting adhesive structure arranged in the first gap to form the medium of the light-transmitting part of the first gap, two sides of the light-transmitting adhesive structure being bonded to the first light exit surface and the second light entrance surface respectively.

6. The optical transmission assembly of claim 5, wherein, The optical transmission assembly further comprises a light-shielding structure arranged in the first gap and surrounding the light-transmitting adhesive structure.

7. The optical transmission assembly according to any of claims 1-6, characterized in that, A vertical distance between the first light exit surface and the second light entrance surface is 1.5um-15um.

8. The optical transmission assembly according to any of claims 1-6, characterized in that, The first prism further has a first reflecting surface, the first reflecting surface and the first light exit surface being oppositely and inclinedly arranged to the first light entrance surface, at least part of light rays incident on the first prism from the first light entrance surface being capable of being emitted from the first light exit surface after being reflected by the first reflecting surface.

9. The optical transmission assembly of claim 8, wherein, The optical transmission assembly further comprises a third prism having a third light entrance surface and a third light exit surface, the third light entrance surface and the second light exit surface being oppositely and spacedly arranged to form a second gap, at least part of light rays emitted from the second prism from the second light exit surface being capable of being sequentially incident on the third prism via a light-transmitting part of the second gap and the third light entrance surface, and being emitted from the third light exit surface, a refractive index of a medium of the light-transmitting part of the second gap being less than a refractive index of the second prism, and the second light exit surface and the third light entrance surface being inclined to the first light entrance surface.

10. The optical transmission assembly of claim 9, wherein, The second prism further has a second reflecting surface connecting the second light-incident surface and the second light-emitting surface, the first light-incident surface and the third light-emitting surface are parallel, the second reflecting surface is partially opposite to the first light-incident surface and the third light-emitting surface respectively, the third prism further has a third reflecting surface, the third light-incident surface and the third reflecting surface are both obliquely opposite to the third light-emitting surface; At least part of the light rays incident on the first prism from the first light-incident surface can be reflected by the first reflecting surface and the first light-incident surface in sequence, and then be incident on the second prism through the first light-emitting surface, the first gap and the second light-incident surface in sequence, at least part of the light rays incident on the second prism can be reflected by the second reflecting surface and then be incident on the third prism through the second light-emitting surface, the second gap and the third light-incident surface in sequence, and the light rays incident on the third prism can be emitted from the third light-emitting surface after being reflected by the third light-emitting surface and the third reflecting surface in sequence.

11. The optical transmission assembly of claim 10, wherein, The included angle between the first light-incident surface and the first reflecting surface, and the included angle between the third reflecting surface and the third light-emitting surface are both 27°-33°, and the included angle between the second light-incident surface and the second light-emitting surface is obtuse.

12. The optical transmission assembly of claim 10, wherein, The second light-incident surface and the second light-emitting surface are connected.

13. The optical transmission assembly of claim 10, wherein, The second light-incident surface and the second light-emitting surface are spaced apart, the second prism further comprises a second top surface connected to the second light-incident surface and the second light-emitting surface and opposite to the second reflecting surface, and the second top surface is coplanar with the first light-incident surface and the third light-emitting surface.

14. The optical transmission assembly of claim 10, wherein, The first reflecting surface is connected to the first light-emitting surface, and the third light-incident surface is connected to the third reflecting surface.

15. The optical transmission assembly of claim 10, wherein, The first reflecting surface is spaced apart from the first light-emitting surface, the first prism further comprises a first top surface connected to the first reflecting surface and the first light-emitting surface, the third light-incident surface is spaced apart from the third reflecting surface, the third prism further comprises a third top surface connected to the third light-incident surface and the third reflecting surface, and the first top surface, the second reflecting surface and the third top surface are coplanar.

16. An image capture module, comprising: The optical conducting assembly comprises a lens, an image sensor and the optical conducting assembly according to any one of claims 1-15, the lens is opposite to the first light-incident surface, the optical conducting assembly is configured to receive the light emitted by the lens through the first light-incident surface and conduct the light rays onto the image sensor.

17. An electronic device, comprising: The camera module according to claim 16.

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