Light path folding lens group, periscopic module and electronic equipment

Abstract

The utility model discloses a light path folding lens group, a periscopic module and electronic equipment, and belongs to the technical field of camera modules. The light path folding lens group comprises a first prism which comprises a first surface and a second surface, and light rays enter the first prism through transmission of the first surface and are emitted out of the first prism from the second surface after being reflected for multiple times in the first prism; the second prism comprises a third surface and a fourth surface, and light rays enter the second prism through transmission of the third surface and are emitted out of the second prism from the fourth surface after being reflected for multiple times in the second prism; and the transmission super-structure mirror is arranged between the second surface and the third surface, receives and corrects the light rays emitted by the second surface and then projects the light rays onto the third surface. According to the optical path folding lens group, the periscopic module and the electronic equipment provided by the invention, both the long-focus shooting quality and the relatively small overall specification can be considered.

Description

Technical Field

[0001] This application belongs to the field of camera module technology, and particularly relates to an optical path folding mirror group, a periscope module, and electronic equipment. Background Technology

[0002] In camera modules, such as periscope modules in mobile phones, optical path folding prisms are often set up to extend the optical path between the lens and the image chip, thereby enabling telephoto shooting.

[0003] As chip surfaces become larger and performance requirements increase, the size of traditional optical design module structures also increases. This places higher space demands on terminals that carry these camera modules, resulting in a smaller range of applications for camera modules. In particular, as the structural space of terminals such as smartphones becomes thinner, the size of traditional optical design periscope modules can no longer meet the needs of smart terminals. Summary of the Invention

[0004] This application provides an optical path folding mirror assembly, a periscope module, and electronic equipment, aiming to at least partially solve the technical problems of large size and high cost of optical path folding prism assemblies. Therefore,

[0005] One aspect of this application provides an optical path folding mirror assembly, comprising:

[0006] The first prism includes a first surface and a second surface, and light enters the first prism through the first surface, and after multiple reflections within the first prism, it exits the first prism from the second surface.

[0007] The second prism includes a third surface and a fourth surface, and light enters the second prism through the third surface, and after multiple reflections within the second prism, it exits the second prism from the fourth surface.

[0008] At least one transmission meta-mirror is disposed between the second surface and the third surface to receive and correct the light emitted from the second surface and then project it onto the third surface.

[0009] In some embodiments, the transmission meta-mirror includes a first transmission meta-mirror and a second transmission meta-mirror;

[0010] The first and second transmission meta-mirrors are sequentially disposed between the second surface and the third surface. Light rays emitted from the second surface are sequentially transmitted through the first and second transmission meta-mirrors and then projected onto the third surface.

[0011] In some embodiments, the fourth surface includes a reflective region and a transmissive region;

[0012] The reflecting area is a light-reflecting surface of the second prism, and the transmitting area is a light-emitting surface of the second prism.

[0013] In some embodiments, the optical path folding mirror assembly further includes a first reflective metamirror, which is attached to the reflective region to form a reflective surface on the fourth surface.

[0014] In some embodiments, light is transmitted from the third surface into the second prism and then reflected on the first reflective metamirror.

[0015] In some embodiments, the second prism further includes a fifth surface, through which light rays within the second prism are reflected by the fifth surface and then transmitted out of the second prism from the fourth surface.

[0016] In some embodiments, the optical path folding mirror assembly further includes a second reflective metamirror, which is attached to the fifth surface to form a reflective surface on the fifth surface.

[0017] In some embodiments, light rays entering the second prism from the third surface are reflected sequentially by the fourth and fifth surfaces and then exit the second prism from the fourth surface.

[0018] Another aspect of this application embodiment also provides a periscope module, including: a lens, an image sensing chip, and the aforementioned optical path folding prism group;

[0019] The lens is disposed on the first surface side, the image sensor chip is disposed on the fourth surface side, and the shooting light is projected from the lens onto the first surface, and the light emitted from the fourth surface through the second prism is projected onto the image sensor chip.

[0020] A third aspect of the embodiments of this application also provides an electronic device including the periscope module described above.

[0021] The embodiments of this application have at least the following beneficial effects:

[0022] The optical path folding lens assembly, periscope module, and electronic device provided in this application embodiment extend the optical path by achieving multiple reflections of light through two prisms to realize telephoto shooting function; and a transmission meta-lens is set between the two prisms to correct and compensate for aberrations and ensure shooting quality; on the other hand, the transmission meta-lens can achieve the correction function with a smaller size than traditional lenses to achieve correction and compensation of light aberrations and / or dispersion, thereby balancing shooting quality and smaller overall size to a certain extent, which is conducive to the widespread use of periscope modules and expands the scope of application; furthermore, through the correction effect of the meta-lens, the number of lenses with correction function inside the lens can also be reduced to a certain extent, thereby reducing the size of the lens and thus reducing the overall size of the camera module, which is convenient for the installation and application of the optical path folding lens assembly. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A schematic diagram of the optical path folding mirror assembly in an embodiment of this application is shown.

[0025] Figure label:

[0026] 1-First prism, 11-First surface, 12-Second surface, 13-Sixth surface, 2-Second prism, 21-Third surface, 22-Fourth surface, 221-Reflection zone, 222-Transmission zone, 23-Fifth surface, 3-Transmission super mirror, 31-First transmission super mirror, 32-Second transmission super mirror, 4-First reflection super mirror, 5-Second reflection super mirror, 6-Filter, 7-Image sensor chip, 8-Lens. Detailed Implementation

[0027] 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 a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0028] Furthermore, reference numerals and / or reference letters may be repeated in different examples in this application. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or settings discussed. In addition, this application provides examples of various specific processes and materials, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0029] This application is described below with reference to the accompanying drawings and specific embodiments:

[0030] In camera modules equipped with telephoto periscope assemblies, several optical path folding prisms are typically incorporated. These prisms cause the light focused by the lens to undergo multiple reflections, thus folding the light path and enabling telephoto shooting. On the other hand, to ensure image quality, optical lenses are usually placed between the different prisms to correct and compensate for aberrations. This increases the overall size of the periscope assembly, requiring more installation space and significantly reducing the range of terminals that can be used with the periscope module, hindering its widespread application.

[0031] Therefore, embodiments of this application provide an optical path folding lens group, a periscope module, and an electronic device, which aim to balance telephoto shooting performance and a smaller overall size to a certain extent, thereby expanding the application range of the periscope module and promoting its widespread use.

[0032] See Figure 1 In some embodiments, the optical path folding lens group adopts a multi-prism relay folding mode, which extends the optical path by folding the focused light from the lens multiple times in each prism and relaying it to achieve telephoto shooting function; and a correction compensation mechanism is set between the prisms to improve aberrations and / or chromatic aberration defects, ensure shooting quality, and take into account the small overall size.

[0033] Specifically, the optical path folding mirror assembly may include: a first prism 1, a second prism 2, and a transmission meta-mirror 3. The transmission meta-mirror 3 is disposed between the first prism 1 and the second prism 2 to correct and compensate for aberrations and / or dispersion.

[0034] The first prism 1 is used to receive focused light from the lens, and the light path is folded by multiple reflections inside the first prism 1 before exiting the first prism 1. The first prism 1 may include a first surface 11 and a second surface 12, and the light focused from the lens can be transmitted into the first prism 1 through the first surface 11, and after multiple reflections inside the first prism 1, it exits the first prism 1 through the second surface 12.

[0035] The transmission meta-mirror 3 is used to correct and compensate for light emitted from the second surface 12, thereby improving aberrations and / or dispersion during light transmission and improving image quality to some extent. Furthermore, the transmission meta-mirror 3 achieves aberration and / or dispersion correction through the meta-mirror, and compared to traditional optical lenses such as glass lenses, it has a smaller volume, thus reducing the distance between two adjacent prisms and consequently reducing the overall size of the optical path folding mirror assembly.

[0036] The second prism 2 is used to receive light after it has been corrected by the transmission meta-mirror 3, and after multiple internal reflections, it exits the second prism 2, thereby further extending the optical path and improving the telephoto shooting performance. The second prism 2 may include a third surface 21 and a fourth surface 22, and light can be transmitted into the second prism 2 through the third surface 21, and after multiple reflections within the second prism 2, it exits the second prism 2 from the fourth surface 22.

[0037] The optical path folding lens assembly provided in this application embodiment can extend the optical path through multiple reflections of light using two prisms to achieve telephoto shooting functionality. A transmission meta-lens is placed between the two prisms to correct and compensate for aberrations and / or chromatic aberration, ensuring image quality. Furthermore, the transmission meta-lens can achieve correction functions with a smaller size compared to traditional lenses, thus achieving aberration and / or chromatic aberration correction and compensation. This balances image quality and a smaller overall size to a certain extent, facilitating the widespread use of periscope modules and expanding their applicability. Moreover, the correction effect of the meta-lens can also reduce the number of internal correction lenses, thereby reducing the lens's size and overall camera module dimensions, facilitating the installation and application of the optical path folding lens assembly.

[0038] In some embodiments, in order to balance optical path dispersion and aberration compensation, the transmission meta-mirror 3 may include a first transmission meta-mirror 31 and a second transmission meta-mirror 32; the first transmission meta-mirror 31 and the second transmission meta-mirror 32 are sequentially disposed between the second surface 12 and the third surface 21, and the light emitted from the second surface 12 passes through the first transmission meta-mirror 31 and the second transmission meta-mirror 32 in sequence before being projected onto the third surface 21; that is, the light transmitted from the second surface 12 is sequentially transmitted through the first transmission meta-mirror 31 and the second transmission meta-mirror 32, thereby cooperating with the correction and compensation light, so as to balance the shooting quality and the small size specification by using two meta-mirrors.

[0039] In other words, the first transmission meta-mirror 31 and the second transmission meta-mirror 32 use different substrate materials and different metasurfaces, with one achieving dispersion compensation and the other achieving chromatic aberration compensation. Correspondingly, the structures of the metasurfaces on the first transmission meta-mirror 31 and the second transmission meta-mirror 32 are configured accordingly. Specifically, the metasurfaces can be provided on both sides of the main body of the first transmission meta-mirror 31 and the second transmission meta-mirror 32, or only on one side; the specific configuration can be determined by comprehensively considering factors such as process complexity, correction and compensation requirements, mirror assembly volume, and cost.

[0040] In some embodiments, one side of the main body of the first transmission meta-mirror 31 can be set as a meta-surface, and the other side can be adapted to fit onto the second plane 12, thereby shortening the distance between the first transmission meta-mirror 31 and the first prism 1, thereby reducing the volume of the entire mirror assembly to a certain extent.

[0041] Similarly, one side of the main body of the second transmission meta-mirror 32 can be set as a meta-surface, and the other side can be adapted to fit onto the third plane 21, thereby shortening the distance between the second transmission meta-mirror 32 and the second prism 2, thus reducing the volume of the entire mirror assembly to a certain extent.

[0042] In some embodiments, the transmission metamirror 3 may include a mirror body, and metafacets are constructed on both sides of the mirror body to respectively correct and compensate for dispersion and chromatic aberration. The use of metafacets with different functions on both sides increases the complexity and difficulty of the manufacturing process to some extent, but it also reduces the number of mirror bodies, thereby shortening the overall distance between the first prism 1 and the second prism 2, and thus reducing the overall size of the mirror assembly.

[0043] In some embodiments, the fourth surface 22 can serve as both a transmission and total internal reflection surface, that is, the fourth surface 22 may include a reflection area 221 and a transmission area 222; wherein, the reflection area 221 is a light-reflecting surface of the second prism 2, participating in the reflection of light within the second prism 2 to achieve the function of optical path folding and extension; the transmission area 222 is the light-emitting surface of the second prism 2, that is, the transmission surface, through which light in the second prism 2 can be transmitted out of the second prism 2, thereby reducing the structural complexity of the second prism 2 to a certain extent.

[0044] In some embodiments, to balance the correction and compensation effect with the reflectivity of the prism, the optical path folding mirror group may further include a first reflective metamirror 4. The first reflective metamirror 4 is disposed on the reflection area 221 to form a reflective surface on the fourth surface 22, thereby achieving the internal reflection function of the reflection area 221 while also taking into account light correction and compensation.

[0045] In some embodiments, one side surface of the first reflective metamirror 4 may be adapted to be attached to the reflective area 221, and the other side may be configured as a reflective metasurface to realize the reflective function.

[0046] In some embodiments, the reflective area 221 can be used as the first reflective surface after entering the second prism 2 from the third surface 21, so that light is reflected and corrected on the first reflective metamirror 4 after being transmitted from the third surface 21 into the second prism 2.

[0047] In some embodiments, the second prism 2 may further include a fifth surface 23, through which light rays are reflected by the fifth surface 23 and then transmitted out of the second prism 2 via the fourth surface 22; that is, the fifth surface 23 is the last reflecting surface of light rays reflected by the second prism 2, and then the light rays are transmitted out of the second prism 2 via the fourth surface 22.

[0048] In some embodiments, in order to improve the light correction and compensation capability of the optical path folding mirror group while taking into account the reflection function, the optical path folding mirror group may further include a second reflective metamirror 5. The second reflective metamirror 5 may be disposed on the fifth surface 23 to form a reflective surface at the fifth surface 23, thereby realizing the internal reflection function and the light correction and compensation function.

[0049] In some embodiments, one side surface of the second reflective metamirror 5 may be adapted to be attached to the fifth surface 23, and the other side may be configured as a reflective metasurface to achieve a reflective function.

[0050] In some embodiments, the second prism 2 can achieve two internal reflections and has two reflective surfaces, so that light rays entering the second prism 2 from the third surface 21 are reflected sequentially by the fourth surface 22 and the fifth surface 23 and then exit the second prism 2 from the fourth surface 22.

[0051] In some embodiments, a first reflective metamirror 4 and a second reflective metamirror 5 are respectively disposed on the reflection region 221 and the fifth surface 23. Light is transmitted from the third surface 21 into the second prism 2, and is reflected in sequence by the first reflective metamirror 4 and the second reflective metamirror 5 in the reflection region 221, and then transmitted out of the second prism 2 from the transmission region 222.

[0052] In some embodiments, light can also be reflected twice inside the first prism 1. That is, the first prism 1 may also include a sixth surface 13. After the light is reflected once on the sixth surface 13 and the first surface 11, it is transmitted out of the first prism 2 from the second surface 12.

[0053] Generally, the first surface 11 can be configured as a transmissive and total internal reflection surface, so that light can be transmitted through the first surface 11 into the first prism 1, but cannot be transmitted in the reverse direction, thus the light in the first prism 1 can be internally reflected by the first surface 11.

[0054] In some embodiments, a periscope module is also provided to enable telephoto shooting. The periscope module may include: a lens 8, an image sensor chip 7, and the aforementioned optical path folding prism group.

[0055] The lens 8 is disposed on the first surface 11 side, and the image sensor chip 7 is disposed on the fourth surface 22 side. The shooting light is projected from the lens 8 onto the first surface 11, and the light emitted from the fourth surface 22 through the second prism 2 is projected onto the image sensor chip 7.

[0056] In other words, light from the subject is focused by the lens 8 and transmitted to the first surface 11, and then into the first prism 1. After multiple reflections and corrections, the light is projected onto the image sensor chip 7 through the transmission area 222 of the fourth surface 22, thus achieving telephoto shooting.

[0057] In some embodiments, in order to suppress light interference, a filter 6 may be provided between the fourth surface 22 and the image sensing chip 7 to filter interfering light and maintain shooting quality.

[0058] In some embodiments, an electronic device is also provided that employs the periscope module described above to enable telephoto shooting functionality of the electronic device.

[0059] Generally, the electronic device can be a smartphone, camera, tablet computer, etc.

[0060] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0061] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0062] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0063] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0064] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0065] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0066] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0067] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An optical path folding mirror group characterized by comprising: include: The first prism includes a first surface and a second surface, and light enters the first prism through the first surface, and after multiple reflections within the first prism, it exits the first prism from the second surface. The second prism includes a third surface and a fourth surface, and light enters the second prism through the third surface, and after multiple reflections within the second prism, it exits the second prism from the fourth surface. At least one transmission meta-mirror is disposed between the second surface and the third surface to receive and correct the light emitted from the second surface and then project it onto the third surface.

2. The optical path folding mirror group according to claim 1, wherein The transmission meta-mirror includes a first transmission meta-mirror and a second transmission meta-mirror; The first and second transmission meta-mirrors are sequentially disposed between the second surface and the third surface. Light rays emitted from the second surface are sequentially transmitted through the first and second transmission meta-mirrors and then projected onto the third surface.

3. The optical path folding mirror group according to claim 2, wherein The fourth surface includes a reflective region and a transmissive region; The reflecting area is a light-reflecting surface of the second prism, and the transmitting area is a light-emitting surface of the second prism.

4. The optical path folding mirror group according to claim 3, wherein The optical path folding mirror assembly also includes a first reflective metamirror, which is attached to the reflective area to form a reflective surface on the fourth surface.

5. The optical path folding mirror group according to claim 4, wherein Light rays are transmitted from the third surface into the second prism and then reflected on the first reflective metamirror.

6. The optical path folding mirror group according to any one of claims 1 to 5, wherein The second prism also includes a fifth surface, through which light rays within the second prism are reflected by the fifth surface and then transmitted through the fourth surface out of the second prism.

7. The optical path folding mirror group according to claim 6, wherein The optical path folding mirror assembly also includes a second reflective metamirror, which is attached to the fifth surface to form a reflective surface on the fifth surface.

8. The optical path folding mirror group according to claim 7, wherein, Light rays entering the second prism from the third surface are reflected sequentially by the fourth and fifth surfaces and then exit the second prism from the fourth surface.

9. A periscope module, characterized by, include: Lens, image sensor chip, and optical path folding prism assembly as described in any one of claims 1 to 8; The lens is disposed on the first surface side, the image sensor chip is disposed on the fourth surface side, and the shooting light is projected from the lens onto the first surface, and the light emitted from the fourth surface through the second prism is projected onto the image sensor chip.

10. An electronic device, comprising: Includes the periscope module as described in claim 9.

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