Optical conduction assembly, camera module and electronic device

Abstract

An optical conduction assembly (30), comprising a first prism (31) and a second prism (32). The first prism (31) has a first light incident surface (311) and a first light exit surface (312). The second prism (32) has a second light incident surface (321) and a second light exit surface (322), a first gap (325) is formed between the first light exit surface (312) and the second light incident surface (321), and light incident onto the first prism (31) from the first light incident surface (311) can be incident onto the second prism (32) through the first light exit surface (312), the first gap (325) and the second light incident surface (321) and exits from the second light exit surface (322). The refractive index of a medium of a light passing 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 incident surface (321) are inclined towards the first light incident surface (311).

Description

Optical transmission components, camera modules and electronic devices

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 2024115246811, filed on October 29, 2024, entitled "Optical Transmission Components, Camera Modules and Electronic Devices", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of camera technology, and in particular to an optical transmission component, camera module and electronic device. Background Technology

[0004] With the rapid development of camera technology, more and more electronic devices such as smartphones, tablets, and e-readers are equipped with camera modules to achieve video recording functions. To meet the needs of long-distance photography, periscope telephoto camera modules have emerged. Periscope telephoto camera modules use prisms to reflect, deflect, and transmit light, which facilitates the folding of the optical path, thereby reducing the space occupied by the camera module. However, the prism optical path in periscope telephoto camera modules is complex, and eliminating stray light is difficult, affecting the image quality of the camera module. Summary of the Invention

[0005] On one hand, this application provides an optical transmission component, including a first prism and a second prism. The first prism has a first light-incident surface and a first light-exit surface. The second prism has 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.

[0006] Wherein, 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-emitting surface and the second light-incident surface are inclined to the first light-incident surface.

[0007] On the other hand, this application provides a camera module including a lens, an image sensor, and an optical transmission component as described above. The lens is opposite to the first light-incident surface, and the optical transmission component is configured to receive the light emitted from the lens through the first light-incident surface and transmit the light to the image sensor.

[0008] In another aspect, this application provides an electronic device including the camera module described above. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the disclosed drawings without creative effort.

[0010] Figure 1 is a schematic diagram of the structure of an electronic device in some embodiments.

[0011] Figure 2 is a schematic diagram of the camera module structure in some embodiments.

[0012] Figure 3 is a schematic diagram of the transmission path of stray light from the camera module in some embodiments.

[0013] Figure 4 is a schematic diagram of the structure of some components of the camera module shown in Figure 3.

[0014] Figure 5 is a schematic diagram of the camera module including two prisms in some other embodiments.

[0015] Figure 6 is a schematic diagram of the structure of the optical transmission component in some embodiments.

[0016] Figure 7 is a schematic diagram of the optical transmission component in some other embodiments.

[0017] Figure 8 is a schematic diagram of the structure in some embodiments where the light-transmitting portions of the first and second gaps use air as the medium.

[0018] Figure 9 is a schematic diagram of the structure of some components of the camera module shown in Figure 8.

[0019] Figure 10 is a schematic diagram of the structure of an electronic device including other components in some embodiments. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] As used herein, "electronic device" refers to, but is not limited to, a device capable of receiving and / or transmitting communication signals connected via any one or more of the following connection methods:

[0022] (1) Via wired connection, such as via Public Switched Telephone Networks (PSTN), Digital Subscriber Line (DSL), digital cable, or direct cable connection;

[0023] (2) Via wireless interface, such as cellular network, wireless local area network (WLAN), digital television network such as DVB-H network, satellite network, AM-FM broadcast transmitter.

[0024] An electronic device configured to communicate via a wireless interface can be referred to as a "mobile terminal". Examples of mobile terminals include, but are not limited to, the following electronic devices:

[0025] (1) Satellite phone or cellular phone;

[0026] (2) A personal communications system (PCS) terminal that can combine cellular radio telephone with data processing, fax and data communication capabilities;

[0027] (3) Radio telephone, pager, Internet / intranet access, web browser, notepad, calendar, personal digital assistant (PDA) equipped with a Global Positioning System (GPS) receiver;

[0028] (4) Conventional above-knee and / or palm-sized receivers;

[0029] (5) Conventional knee-mounted and / or handheld wireless telephone transceivers, etc.

[0030] This application provides an optical transmission component, including a first prism and a second prism. The first prism has a first light-incident surface and a first light-exit surface; the second prism has 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 to the first light-incident surface.

[0031] In one embodiment, the optical transmission component satisfies the condition: arcsin(n2 / n1)≤π / 2-a;

[0032] Wherein, n1 is the refractive index of the first prism, n2 is the refractive index of the medium in the light-transmitting portion of the first gap, and a is the radian of the angle between the first light-emitting surface and the first light-incident surface.

[0033] In one embodiment, the optical transmission component satisfies the following conditions: n1 / n2≥1.22; 1.6≤n1≤2.2; 1.3≤n2≤1.6.

[0034] In one embodiment, the angle between the first light-emitting surface and the first light-incident surface is 30°-45°.

[0035] In one embodiment, the light-transmitting portion of the first gap is an air medium.

[0036] In one embodiment, the optical transmission component further includes an adhesive structure disposed in the first gap and surrounding the light-transmitting portion of the first gap, wherein the first light-emitting surface and the second light-incident surface are respectively adhered to both sides of the adhesive structure.

[0037] In one embodiment, the adhesive structure is made of a light-shielding material; or, the optical transmission component further includes a light-shielding structure disposed in the first gap and surrounding the light-transmitting portion of the first gap.

[0038] In one embodiment, the optical transmission component further includes a light-transmitting adhesive structure, which is disposed in the first gap to form a light-transmitting portion of the first gap, and the first light-emitting surface and the second light-incident surface are respectively bonded to both sides of the light-transmitting adhesive structure.

[0039] In one embodiment, the optical transmission component further includes a light-shielding structure disposed in the first gap and surrounding the light-transmitting adhesive structure.

[0040] In one embodiment, the vertical distance between the first light-emitting surface and the second light-incident surface is 1.5µm-15µm.

[0041] In one embodiment, the first prism further has a first reflecting surface, and both the first reflecting surface and the first light-emitting surface are inclined opposite to the first light-incident surface, so that at least a portion of the light rays incident on the first prism from the first light-incident surface can be reflected by the first reflecting surface and emitted from the first light-emitting surface.

[0042] In one embodiment, the optical transmission component further includes a third prism having a third light-incident surface and a third light-exit surface. The third light-incident surface and the second light-exit surface are opposite to each other and spaced apart to form a second gap. At least a portion of the light rays emitted from the second light-exit surface can sequentially pass through the light-transmitting portion of the second gap and the third light-incident surface to enter the third prism and exit from the third light-exit surface. The refractive index of the medium in the light-transmitting portion of the second gap is less than the refractive index of the second prism. The second light-exit surface and the third light-incident surface are inclined to the first light-incident surface.

[0043] In one embodiment, the second prism further has a second reflecting surface connecting the second light-incident surface and the second light-outcrystal surface, the first light-incident surface and the third light-outcrystal surface are parallel, the second reflecting surface is partially opposite to the first light-incident surface and the third light-outcrystal surface, and the third prism further has a third reflecting surface, both the third light-incident surface and the third reflecting surface are inclined opposite to the third light-outcrystal surface;

[0044] At least a portion of the light rays incident on the first prism from the first incident surface can be reflected sequentially by the first reflecting surface and the first incident surface, and then sequentially pass through the first emitting surface, the light-transmitting portion of the first gap, and the second incident surface to enter the second prism. At least a portion of the light rays incident on the second prism can be reflected by the second reflecting surface and sequentially pass through the second emitting surface, the light-transmitting portion of the second gap, and the third incident surface to enter the third prism. The light rays incident on the third prism can be reflected sequentially by the third emitting surface and the third reflecting surface and then exit from the third emitting surface.

[0045] In one embodiment, the angle between the first light-incident surface and the first reflective surface, and the angle between the third reflective surface and the third light-emitting surface are both 27°-33°, and the angle between the second light-incident surface and the second light-emitting surface is an obtuse angle.

[0046] In one embodiment, the second light-incident surface and the second light-exiting surface are connected.

[0047] In one embodiment, the second light-incident surface and the second light-exiting surface are spaced apart, and the second prism further includes a second top surface connected to the second light-incident surface and the second light-exiting surface and opposite to the second reflective surface, wherein the second top surface is coplanar with the first light-incident surface and the third light-exiting surface.

[0048] In one embodiment, the first reflective surface is connected to the first light-emitting surface, and the third light-incident surface is connected to the third reflective surface.

[0049] In one embodiment, the first reflecting surface is spaced apart from the first emitting surface, the first prism further includes a first top surface connected to the first reflecting surface and the first emitting surface, the third incident surface is spaced apart from the third reflecting surface, and the third prism further includes a third top surface connected to the third incident surface and the third reflecting surface, wherein the first top surface, the second reflecting surface and the third top surface are coplanar.

[0050] This application also provides a camera module, including a lens, an image sensor, and an optical transmission component as described in any of the above embodiments. The lens is opposite to the first light-incident surface, and the optical transmission component is configured to receive the light emitted from the lens through the first light-incident surface and transmit the light to the image sensor.

[0051] This application also provides an electronic device, including the camera module as described above.

[0052] Please refer to Figures 1 and 2, which respectively illustrate the structural schematic diagrams of the electronic device 10 and the camera module 20 in some embodiments of this application. The electronic device 10 provided in this application includes, but is not limited to, smartphones, tablet computers, e-readers, etc. The electronic device 10 includes a housing 11 and a camera module 20 disposed within the housing 11. The housing 11 is provided with a light-entry hole 111. The camera module 20 includes a lens 21, an image sensor 22, and an optical transmission component 30. The lens 21 is opposite to the light-entry hole 111 and can collect ambient light through the light-entry hole 111. The optical transmission component 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 the central processing unit of the electronic device 10, or a chip in the electronic device 10 specifically used for image processing, so that the electronic device 10 can realize the camera function. The lens 21 may include one or more lenses. Light entering the lens 21 from the light inlet 111 can be emitted after being adjusted by each lens of the lens 21 in sequence. The image sensor 22 may include, but is not limited to, a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS).

[0053] Referring to Figures 2 and 3, in some embodiments, light is emitted after one or more reflections in the optical transmission component 30. That is, the optical transmission component 30 can also change the light transmission path during the light transmission process, achieving a folded light path effect, which helps to reduce the space occupied by the camera module 20. It should be noted that the optical transmission component 30 is used to transmit the light reflected from the subject to be photographed to the image sensor 22. In this application, this portion of light is referred to as the imaging light. The dashed arrow in Figure 2 illustrates the transmission path of the main imaging light ray in the camera module 20.

[0054] Traditional optical transmission components often transmit stray light to the image sensor, affecting the imaging quality of the camera module. This stray light may originate from sunlight or other strong light sources in the environment, or from reflections and scattering within the lens and the internal structure of the optical transmission component. To reduce stray light and its impact on the imaging quality of the camera module, traditional optical transmission components typically have grooves on the prism surface filled with an anti-light material. However, to avoid the grooves affecting the transmission of imaging light within the optical transmission component, the groove depth is usually shallow and cannot cover the stray light transmission path inside the optical transmission component. This makes stray light reduction within the optical transmission component difficult and detrimental to improving image quality.

[0055] To address the aforementioned issues, referring to Figures 2, 3, and 4, in some embodiments, the optical transmission component 30 includes a first prism 31 and a second prism 32. The first prism 31 has a first light-incident surface 311 and a first light-exiting surface 312, and the second prism 32 has a second light-incident surface 321 and a second light-exiting surface 322. The first light-exiting surface 312 and the second light-incident surface 321 are positioned opposite each other and spaced apart to form a first gap 325. The first light-exiting surface 312 and the second light-incident surface 321 may be substantially parallel. At least a portion of the light rays incident on the first prism 31 from the first light-incident surface 311 can sequentially pass through the first light-exiting surface 312, the light-transmitting portion of the first gap 325, and the second light-incident surface 321 to enter the second prism 32, and exit from the second light-exiting surface 322. The light rays can undergo one or more reflections in both the first prism 31 and the second prism 32. The light-transmitting portion of the first gap 325 can be understood as the portion through which the imaging light passes. The position of the light-transmitting portion in the first gap 325 can be set according to the optical path design of the optical transmission component 30, as long as the imaging light can pass through the light-transmitting portion of the first gap 325 between the first light-emitting surface 312 and the second light-incident surface 321. The refractive index of the medium within the light-transmitting portion of the first gap 325 is less than the refractive index of the first prism 31, and the first light-emitting surface 312 and the second light-incident surface 321 are inclined relative to the first light-incident surface 311. When the light passes through the light-transmitting portion of the first gap 325, it will pass through the medium within the light-transmitting portion of the first gap 325. For example, the light can exit the first light-emitting surface 312 from the interface between the first light-emitting surface 312 and the medium of the light-transmitting portion of the first gap 325, and enter the second prism 32 from between the medium of the light-transmitting portion of the first gap 325 and the second light-incident surface 321.

[0056] As can be seen from Figures 2 and 3, when the imaging light is reflected once or multiple times within the first prism 31 and strikes the interface between the first light-emitting surface 312 and the first gap 325, since the first light-emitting surface 312 and the second light-incident surface 321 are inclined to the first light-incident surface 311, the incident angle of the imaging light at the interface between the first light-emitting surface 312 and the first gap 325 will not be too large. The imaging light is not easily reflected at the interface between the first light-emitting surface 312 and the first gap 325, and can pass through the first gap 325 and the second light-incident surface 321 to strike the second prism 32. Stray light incident from the first prism 31 onto the interface between the first light-emitting surface 312 and the first gap 325, taking one stray beam incident on the middle of the first light-emitting surface 312 as an example, the incident angle of the stray light at the interface between the first light-emitting surface 312 and the first gap 325 is usually much larger than the incident angle of the imaging light. Combined with the design that the refractive index of the medium in the light-transmitting part of the first gap 325 is less than the refractive index of the first prism 31, the stray light is incident from the optically denser medium of the first prism 31 onto the optically less dense medium of the first gap 325. The stray light is easy to undergo total internal reflection at the interface between the first light-emitting surface 312 and the first gap 325 and be emitted away from the first light-emitting surface 312, for example, emitted from the first light-incident surface 311 and exiting the first prism 31, thereby achieving the effect of reducing stray light. It is evident that the method of reducing stray light by designing the angle and refractive index of the first gap 325 is not limited by the incident position of stray light on the first light-emitting surface 312, and can also reduce stray light located in the middle of the first prism 31, effectively improving the imaging quality of the camera module 20.

[0057] The optical transmission component 30 described above has a medium with a refractive index of less than that of the first prism 31 in the light-transmitting portion of the first gap 325. This helps to reduce the critical angle of total internal reflection of light rays incident from the first prism 31 onto the interface between the first prism 31 and the first gap 325, making it easier for light rays to undergo total internal reflection at the interface between the light-transmitting portion of the first prism 31 and the first gap 325. Furthermore, by setting the first light-emitting surface 312 and the second light-incident surface 321 to be inclined relative to the first light-incident surface 311, it is beneficial to reduce the incident angle of the imaging light at the interface between the first prism 31 and the first gap 325, thereby reducing the reflection probability of the imaging light at the interface between the first prism 31 and the first gap 325 and reducing the impact of the setting of the first gap 325 on the light-guiding function of the optical transmission component 30. At the same time, it is also beneficial to increase the incident angle of stray light at the interface between the first prism 31 and the first gap 325. Combined with the design of the refractive index of the medium of the light-transmitting part of the first gap 325, the probability of total internal reflection of stray light at the interface between the first prism 31 and the first gap 325 is improved, thereby achieving the effect of stray light reduction. In addition, by designing the first gap 325 between the first light-emitting surface 312 and the second light-incident surface 321 to reduce stray light, the stray light reduction setting is closely integrated with the structure of the optical transmission component 30, which will not lead to an increase in the space occupied by the optical transmission component 30, thus helping to compress the size of the optical transmission component 30.

[0058] In some embodiments, at least a portion of the first light-emitting surface 312 and the second light-incident surface 321 are bonded together, that is, the first prism 31 and the second prism 32 are glued together. Therefore, the optical transmission component 30 provided in this application can achieve the effect of reducing stray light by splitting a prism into two glued first prisms 31 and 32, and by designing the refractive index and angle of the first gap 325 between the first prisms 31 and 32. Thus, the stray light reduction setting is tightly integrated with the prism structure of the optical transmission component 30 and is highly integrated, without increasing the space occupied by the optical transmission component 30.

[0059] 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.

[0060] Referring to Figures 2 and 4, 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. A first light-emitting surface 312 and a second light-incident surface 321 are respectively bonded to both sides of the light-transmitting adhesive structure 34. The light-transmitting adhesive structure 34, with 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 improves the reliability of the bonding between the first prism 31 and the second prism 32, thereby enhancing the structural strength of the optical transmission component 30.

[0061] In some embodiments, the optical transmission component 30 further includes a light-shielding structure 35, which is disposed in the first gap 325 and surrounds the light-transmitting adhesive structure 34. That is, the light-shielding structure 35 is disposed in the area outside the light-transmitting portion of the first gap 325 corresponding to the imaging light. The light-shielding structure 35 includes, but is not limited to, any suitable light-shielding material such as screen printing or light-shielding medium film. By providing a light-shielding structure 35 with better light-shielding effect in the area outside the light-transmitting portion, it can effectively absorb, scatter, or reflect stray light that is reflected outside the light-transmitting portion, thereby improving the stray light reduction effect of the camera module 20 and thus improving the imaging quality of the camera module 20. Of course, in other embodiments, the light-transmitting adhesive structure 34 can also fill the entire first gap 325, that is, fill the light-transmitting portion and the area outside the light-transmitting portion, to further increase the bonding area of ​​the first prism 31 and the second prism 32 and improve the structural reliability of the optical transmission component 30. When the light-transmitting adhesive structure 34 fills the entire first gap 325, the optical transmission component 30 may also be provided with a light-shielding structure 35 in the area outside the light-transmitting part of the first gap 325 to improve the effect of reducing stray light. The light-shielding structure 35 may be provided in the part of the light-transmitting adhesive structure 34 outside the light-transmitting part, for example, it may be stacked on the light-transmitting adhesive structure 34.

[0062] Referring to Figures 4 and 5, in some embodiments, the first prism 31 also has a first reflecting surface 313. Both the first reflecting surface 313 and the first emitting surface 312 are inclined opposite to the first incident surface 311. Imaging light rays incident on the first prism 31 from the first incident surface 311 can be reflected by the first reflecting surface 313 and then emitted from the first emitting surface 312. It is understood that when the first prism 31 is provided with the first reflecting surface 313 to conduct imaging light rays through reflection, stray light generated by sunlight or other strong light sources from the outside world can easily reach the middle position of the first emitting surface 312 after reflection by the first reflecting surface 313, such as the stray light transmission path shown by the dashed arrows in Figures 4 and 5. By designing the refractive index and angle of the medium of the first gap 325, the probability of total internal reflection of this part of the stray light on the first emitting surface 312 can be increased, solving the problem that traditional camera modules cannot reduce stray light at the middle position.

[0063] Further, referring to FIG2, in some embodiments, the optical transmission component 30 further includes a third prism 33, which has a third light-incident surface 331 and a third light-exiting surface 332. The third light-incident surface 331 and the second light-exiting surface 322 are opposite to each other and spaced apart to form a second gap 335. At least a portion of the light emitted from the second light-exiting surface 322 through the light-transmitting portion of the second prism 32 can sequentially pass through the light-transmitting portion of the second gap 335 and the third light-incident surface 331 to enter the third prism 33, and then exit from the third light-exiting surface 332. The refractive index of the medium in the light-transmitting portion of the second gap 335 is less than the refractive index of the second prism 32. The second light-exiting surface 322 and the third light-incident surface 331 are inclined to the first light-incident surface 311, and at least a portion of the second light-exiting surface 322 and the third light-incident surface 331 can be bonded together. The optical transmission component 30 is divided into three prisms bonded together. The refractive index and 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, as shown by the dashed arrow in Figure 3, when light that has not been reduced by the first gap 325 shines from the second prism 32 onto the interface between the second light-emitting surface 322 and the second gap 335, the second gap 335 can reduce this part of the stray light again, effectively improving the stray light reduction effect, thereby improving the imaging quality of the camera module 20.

[0064] In some embodiments, the second prism 32 further has a second reflecting surface 323 connecting the second light-incident surface 321 and the second light-exiting surface 322, the first light-incident surface 311 and the third light-exiting surface 332 are parallel, the second reflecting surface 323 is partially opposite to the first light-incident surface 311 and the third light-exiting surface 332 respectively, and the third prism 33 further has a third reflecting surface 333, the third light-incident surface 331 and the third reflecting surface 333 are both inclined opposite to the third light-exiting surface 332. At least a portion of the light rays incident on the first prism 31 from the first light-incident surface 311 are reflected sequentially by the first reflecting surface 313 and the first light-incident surface 311, then sequentially pass through the first light-exiting surface 312, the light-transmitting portion of the first gap 325, and the second light-incident surface 321 before entering the second prism 32. At least a portion of the light rays incident on the second prism 32 are reflected by the second reflecting surface 323 and sequentially pass through the second light-exiting surface 322, the light-transmitting portion of the second gap 335, and the third light-incident surface 331 before entering the third prism 33. The light rays incident on the third prism 33 are reflected sequentially by the third light-exiting surface 332 and the third reflecting surface 333 before exiting from the third light-exiting surface 332. Thus, through the rational design of the structure of the three prisms, the light can undergo five reflections within the optical transmission component 30, effectively extending the light transmission path within the optical transmission component 30, effectively achieving the effect of folded light path, adapting to the telephoto design of the lens 21, and also helping to reduce the space occupied by the camera module 20. Meanwhile, as can be seen from the imaging light transmission path shown in Figure 2, the first light-emitting surface 312 and the second light-emitting surface 322 are inclined to the first light-incident surface 311, and the first light-emitting surface 312 and the first light-incident surface 311 form an acute angle, while the second light-emitting surface 322 and the first light-incident surface 311 form an obtuse angle. This design can be coordinated with the design of the five-fold reflection transmission path of the optical transmission component 30, effectively reducing the incident angle when the imaging light hits the first light-emitting surface 312 and the second light-emitting surface 322, reducing the reflection probability of the imaging light on the first light-emitting surface 312 and the second light-emitting surface 322, thereby reducing the impact of the setting of the first gap 325 and the second gap 335 on the transmission of the imaging light.

[0065] The prisms involved in this application include, but are not limited to, optical elements made of plastic or glass. The materials and refractive indices of the prisms may be the same or different. In some embodiments, the angle between the first incident surface 311 and the first reflecting surface 313, and the angle between the third reflecting surface 333 and the third emitting surface 332 are both 27°-33°, for example, 30°, and the angle between the second incident surface 321 and the second emitting surface 322 is an obtuse angle. This arrangement facilitates the rational planning of the structure of the optical transmission component 30, enabling the structural design of the optical transmission component 30 to adapt to the five reflection paths of the imaging light and the reflection effect of the first gap 325 and the second gap 335 on stray light, effectively reducing stray light without affecting the transmission of the imaging light.

[0066] In some embodiments, the angle between the first light-emitting surface 312 and the first light-incident surface 311 is 30°-45°, and the acute angle between the second light-emitting surface 322 and the plane containing the first light-incident surface 311 can also be 30°-45°, in order to adapt to the transmission path of the imaging light, reduce the influence of the first gap 325 and the second gap 335 on the transmission process of the imaging light, and at the same time increase the incident angle of stray light on the first light-emitting surface 312 and the second light-emitting surface 322, increase the reflection probability of stray light, thereby improving the effect of stray light reduction.

[0067] In some embodiments, the optical transmission component 30 satisfies: n1 / n2 ≥ 1.22. Combining this with the calculation formula for the critical angle of total internal reflection, it can be seen that when the above condition is met, stray light incident on the first emitting surface 312, when its exit angle on the first emitting surface 312 is greater than or equal to 45°, can undergo total internal reflection on the first emitting surface 312 and be reduced. This allows it to coordinate with the angle range between the first emitting surface 312 and the first incident surface 311, effectively reducing most of the stray light and improving the stray light reduction effect. In some embodiments, the optical transmission component 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 in the light-transmitting portion of the first gap 325 can be 1.4. In some embodiments, the vertical distance between the first light-emitting surface 312 and the second light-incident surface 321, i.e., the dielectric thickness of the light-transmitting portion of the first gap 325, is 1.5µm-15µm. This ensures that the first gap 325 has sufficient distance to provide a dielectric basis for stray light reflection, while also reducing the impact of the first gap 325 on the structural reliability and volume of the optical transmission component 30. It should be noted that the relationship between the refractive indices of the dielectrics of the light-transmitting portions of the second prism 32 and the second gap 335 can be obtained by referring to the refractive indices of the dielectrics of the light-transmitting portions of the first prism 31 and the first gap 325. The angular relationship between the second light-emitting surface 322 and the third light-emitting surface 332 can be obtained by referring to the angular relationship between the first light-emitting surface 312 and the first light-incident surface 311. The dielectric thickness of the light-transmitting portion of the second gap 335 can also be obtained by referring to the dielectric thickness of the light-transmitting portion of the first gap 325. As long as the second gap 335 can also reduce at least a portion of the stray light through total internal reflection, this will not be elaborated upon in this application.

[0068] It should be noted that Figures 2 and 3 are merely examples of the optical path and structural design of the optical transmission component 30 in some embodiments of this application. In the embodiments shown in Figures 2 and 3, the optical transmission component 30 includes three bonded prisms, forming a first gap 325 and a second gap 335, and the light undergoes five reflections within the optical transmission component 30. Referring to Figure 5, in other embodiments, the optical transmission component 30 may also be composed 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 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.

[0069] Referring to Figure 6, 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. Referring to Figure 7, in other embodiments, the second light-incident surface 321 and the second light-exiting surface 322 are spaced apart, and 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, so the second prism 32 can be approximately quadrangular in shape with a trapezoidal cross-section, 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.

[0070] Referring to Figure 6, in some embodiments, the first reflecting surface 313 is connected to the first emitting surface 312, and the third 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. Referring to Figure 7, in other embodiments, the first reflecting surface 313 and the first emitting surface 312 are spaced apart. 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 and the third reflecting surface 333 are spaced apart. The third prism 33 further includes a third top surface 334 connected to the third incident surface 331 and the third reflecting surface 333. Therefore, the first prism 31 and the third prism 33 can be approximately quadrangular prisms 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 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.

[0071] Please refer to Figures 8 and 9. 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. That is, the adhesive structure 36 is arranged around the air medium of the first gap 325, and 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, increases the probability of stray light undergoing total internal reflection on the first light-emitting surface 312, and further improves 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.

[0072] In the embodiments shown in Figures 8 and 9, the medium of the light-transmitting portion of the second gap 335 and the structural arrangement outside the light-transmitting portion can be obtained with reference to the first gap 325. The medium of the light-transmitting portion of the first gap 325 and the second gap 335 can be the same or different. For example, the medium of the light-transmitting portion of the first gap 325 and the second gap 335 can be air medium and light-transmitting adhesive structure 34, respectively.

[0073] Referring to FIG10, FIG10 is a schematic diagram of the structure of an electronic device 10 provided in an embodiment of this application. The electronic device 10 may 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, etc. Those skilled in the art will understand that the structure of the electronic device 10 shown in FIG10 does not constitute a limitation on the electronic device 10, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0074] The radio frequency (RF) circuit 501 can be used to send and receive information, or to receive and send signals during a call. Specifically, it receives downlink information from the base station and hands it over to one or more processors 508 for processing; additionally, it sends uplink data to the base station. Typically, the RF 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, etc. Furthermore, the RF circuit 501 can also communicate wirelessly with networks and other devices. This wireless communication can use any communication standard or protocol, including but not limited to GSM, GPRS, CDMA, WCDMA, LTE, email, and SMS.

[0075] Memory 502 can be used to store applications and data. The applications stored in memory 502 contain executable code. Applications can be composed of various functional modules. Processor 508 executes various functional applications and data processing by running the applications stored in memory 502. Memory 502 may primarily include a program storage area and a data storage area. The program storage area may store the operating system, applications required for at least one function (such as sound playback, image playback, etc.), etc.; the data storage area may store data created based on the use of electronic device 10 (such as audio data, phonebook, etc.). Furthermore, memory 502 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, memory 502 may also include a memory controller to provide access to memory 502 for processor 508 and input unit 503.

[0076] Input unit 503 can be used to receive input numbers, character information, or user characteristic information (such as fingerprints), and to generate keyboard, mouse, joystick, optical, or trackball signal inputs related to user settings and function control. Specifically, in one embodiment, input unit 503 may include a touch-sensitive surface and other input devices. The touch-sensitive surface, also known as a touch display or touchpad, can collect touch operations performed by the user on or near it (such as operations performed by the user using a finger, stylus, or any suitable object or accessory on or near the touch-sensitive surface), and drive corresponding connection devices according to a pre-set program. Optionally, the touch-sensitive surface may include two parts: a touch detection device and a touch controller. The touch detection device detects the user's touch orientation and the signal generated by the touch operation, transmitting the signal to the touch controller; the touch controller receives touch information from the touch detection device, converts it into touch point coordinates, sends it to the processor 508, and can receive and execute commands from the processor 508.

[0077] Display unit 504 can be used to display information input by the user or information provided to the user, as well as various graphical user interfaces of electronic device 10. These graphical user interfaces can be composed of graphics, text, icons, video, and any combination thereof. Display unit 504 may include a display panel. Optionally, the display panel can be configured in the form of a liquid crystal display (LCD), organic light-emitting diode (OLED), or the like. Further, a touch-sensitive surface can cover the display panel. When the touch-sensitive surface detects a touch operation on or near it, it transmits the information to processor 508 to determine the type of touch event. Subsequently, processor 508 provides corresponding visual output on the display panel according to the type of touch event. Although in FIG. 10, the touch-sensitive surface and the display panel are implemented as two separate components to realize input and output functions, in some embodiments, the touch-sensitive surface and the display panel can be integrated to realize input and output functions.

[0078] The electronic device 10 may also include at least one sensor 505, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor may include an ambient light sensor and a proximity sensor. The ambient light sensor can adjust the brightness of the display panel according to the ambient light level, and the proximity sensor can turn off the display panel and / or backlight when the electronic device 10 is moved to the ear. As a type of motion sensor, a gravity acceleration sensor can detect the magnitude of acceleration in various directions (generally three axes). When stationary, it can detect the magnitude and direction of gravity and can be used for applications that recognize the phone's posture (such as landscape / portrait switching, related games, magnetometer posture calibration), vibration recognition-related functions (such as pedometer, tapping), etc. Other sensors that may be configured in the electronic device 10, such as gyroscopes, barometers, hygrometers, thermometers, and infrared sensors, will not be described in detail here.

[0079] Audio circuit 506 provides an audio interface between the user and electronic device 10 via a speaker and microphone. Audio circuit 506 converts received audio data into electrical signals, transmits them to the speaker, and the speaker outputs them as sound signals. Conversely, the microphone converts collected sound signals into electrical signals, which are then received by audio circuit 506, converted back into audio data, and processed by processor 508. The audio data is then transmitted via radio frequency circuit 501 to, for example, another electronic device 10, or output to memory 502 for further processing. Audio circuit 506 may also include a headphone jack to facilitate communication between peripheral headphones and electronic device 10.

[0080] Wi-Fi is a short-range wireless transmission technology. Electronic device 10, through Wi-Fi module 507, can help users send and receive emails, browse web pages, and access streaming media, providing users with wireless broadband internet access. Although Figure 10 shows Wi-Fi module 507, it is understood that it is not an essential component of electronic device 10 and can be omitted as needed without changing the essence of the invention.

[0081] The processor 508 is the control center of the electronic device 10. It connects various parts of the electronic device 10 via various interfaces and lines. By running or executing applications stored in the memory 502 and calling data stored in the memory 502, it performs various functions and processes data of the electronic device 10, thereby providing overall monitoring of the electronic device 10. Optionally, the processor 508 may include one or more processing cores; preferably, the processor 508 may integrate an application processor and a modem processor, wherein the application processor mainly handles the operating system, user interface, and applications, while the modem processor mainly handles wireless communication. It is understood that the modem processor may not be integrated into the processor 508.

[0082] The electronic device 10 also includes a power supply 509 that supplies power to the various components. Preferably, the power supply 509 can be logically connected to the processor 508 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system. The power supply 509 may also include one or more DC or AC power supplies, recharging systems, power fault detection circuits, power converters or inverters, power status indicators, and other arbitrary components.

[0083] Although not shown in Figure 10, the electronic device 10 may also include a Bluetooth module, etc., which will not be described in detail here. In specific implementation, the above modules can be implemented as independent entities, or they can be arbitrarily combined and implemented as the same or several entities. For the specific implementation of the above modules, please refer to the previous method embodiments, which will not be described in detail here.

[0084] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0085] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An optical transmission component, comprising: The first prism has a first light-incident surface and a first light-outcrying surface; The second prism has a second light-incident surface and a second light-outcrystal surface. The first light-outcrystal 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-outcrystal surface, the light-transmitting portion of the first gap, and the second light-incident surface to enter the second prism, and then exit from the second light-outcrystal surface. Wherein, 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-emitting surface and the second light-incident surface are inclined to the first light-incident surface.

2. The optical transmission component according to claim 1, wherein, The optical transmission component satisfies the following condition: arcsin(n2 / n1)≤π / 2-a; Wherein, n1 is the refractive index of the first prism, n2 is the refractive index of the medium in the light-transmitting portion of the first gap, and a is the radian of the angle between the first light-emitting surface and the first light-incident surface.

3. The optical transmission component according to claim 2, wherein, The optical transmission component satisfies the following condition: n1 / n2 ≥ 1.22; 1.6≤n1≤2.2； 1.3≤n2≤1.6。 4. The optical transmission component according to claim 1, wherein, The angle between the first light-emitting surface and the first light-incident surface is 30°-45°.

5. The optical transmission component according to claim 1, wherein, The light-transmitting portion of the first gap is air.

6. The optical transmission component according to claim 1, wherein, The optical transmission component further includes an adhesive structure, which is disposed in the first gap and surrounds the light-transmitting portion of the first gap, and the first light-emitting surface and the second light-incident surface are respectively adhered to both sides of the adhesive structure.

7. The optical transmission component according to claim 6, wherein, The adhesive structure is made of a light-shielding material; or, the optical transmission component further includes a light-shielding structure, which is disposed in the first gap and surrounds the light-transmitting portion of the first gap.

8. The optical transmission component according to claim 1, wherein, The optical transmission component further includes a light-transmitting adhesive structure, which is disposed in the first gap to form a medium for the light-transmitting portion of the first gap, and the first light-emitting surface and the second light-incident surface are respectively bonded to both sides of the light-transmitting adhesive structure.

9. The optical transmission component according to claim 8, wherein, The optical transmission component further includes a light-shielding structure, which is disposed in the first gap and surrounds the light-transmitting adhesive structure.

10. The optical transmission component according to any one of claims 1-9, wherein, The vertical distance between the first light-emitting surface and the second light-incident surface is 1.5um-15um.

11. The optical transmission component according to any one of claims 1-9, wherein, The first prism also has a first reflecting surface, and both the first reflecting surface and the first light-emitting surface are inclined opposite to the first light-incident surface. At least a portion of the light rays incident on the first prism from the first light-incident surface can be reflected by the first reflecting surface and then emitted from the first light-emitting surface.

12. The optical transmission component according to claim 11, wherein, The optical transmission component further includes a third prism, which has a third light-incident surface and a third light-exit surface. The third light-incident surface and the second light-exit surface are opposite to each other and spaced apart to form a second gap. At least a portion of the light rays emitted from the second light-exit surface can sequentially pass through the light-transmitting portion of the second gap and the third light-incident surface to enter the third prism and exit from the third light-exit surface. The refractive index of the medium in the light-transmitting portion of the second gap is less than the refractive index of the second prism. The second light-exit surface and the third light-incident surface are inclined to the first light-incident surface.

13. The optical transmission component according to claim 12, wherein, The second prism also has a second reflecting surface connecting the second light-incident surface and the second light-outcrystal surface. The first light-incident surface and the third light-outcrystal surface are parallel. The second reflecting surface is partially opposite to the first light-incident surface and the third light-outcrystal surface, respectively. The third prism also has a third reflecting surface. Both the third light-incident surface and the third reflecting surface are inclined opposite to the third light-outcrystal surface. At least a portion of the light rays incident on the first prism from the first incident surface can be reflected sequentially by the first reflecting surface and the first incident surface, and then sequentially pass through the first emitting surface, the light-transmitting portion of the first gap, and the second incident surface to enter the second prism. At least a portion of the light rays incident on the second prism can be reflected by the second reflecting surface and sequentially pass through the second emitting surface, the light-transmitting portion of the second gap, and the third incident surface to enter the third prism. The light rays incident on the third prism can be reflected sequentially by the third emitting surface and the third reflecting surface and then exit from the third emitting surface.

14. The optical transmission component according to claim 13, wherein, The angle between the first light-incident surface and the first reflective surface, and the angle between the third reflective surface and the third light-emitting surface are both 27°-33°, and the angle between the second light-incident surface and the second light-emitting surface is an obtuse angle.

15. The optical transmission component according to claim 13, wherein, The second light-incident surface and the second light-outceasing surface are connected.

16. The optical transmission component according to claim 13, wherein, The second light-incident surface and the second light-exiting surface are spaced apart. The second prism also includes a second top surface connected to the second light-incident surface and the second light-exiting surface and opposite to the second reflective surface. The second top surface is coplanar with the first light-incident surface and the third light-exiting surface.

17. The optical transmission component according to claim 13, wherein, The first reflective surface is connected to the first light-emitting surface, and the third light-incident surface is connected to the third reflective surface.

18. The optical transmission component according to claim 13, wherein, The first reflecting surface is spaced apart from the first emitting surface. The first prism further includes a first top surface connected to the first reflecting surface and the first emitting surface. The third incident surface is spaced apart from the third reflecting surface. The third prism further includes a third top surface connected to the third incident surface and the third reflecting surface. The first top surface, the second reflecting surface, and the third top surface are coplanar.

19. A camera module, comprising a lens, an image sensor, and an optical transmission component as described in any one of claims 1-18, wherein the lens is opposite to a first light-incident surface, and the optical transmission component is configured to receive light emitted from the lens through the first light-incident surface and transmit the light to the image sensor.

20. An electronic device comprising the camera module as described in claim 19.

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