Combined prism

Abstract

The utility model discloses a combined prism, which can be used for a camera module of electronic equipment, and comprises a first prism and a second prism which need to be connected, and a diaphragm positioned between the first prism and the second prism, the first prism comprises a first connecting surface, the second prism comprises a second connecting surface connected with the first connecting surface, and the first connecting surface and the second connecting surface are connected in a gluing manner; the first connecting surface is provided with a first groove matched with the diaphragm, the diaphragm is arranged in the first groove so as to reduce a gap between the first connecting surface and the second connecting surface, and the glue thickness of glue in the gap is smaller than a preset thickness so as to reduce the generation of diffraction stray light of the camera module; according to the utility model, the gap between the connecting surface of the first prism and the connecting surface of the second prism can be greatly reduced, less light blocking is generated, and the diffraction stray light of the camera module of the electronic equipment is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic equipment accessories, in particular to a combined prism. Background Art

[0002] The telephoto module of a mobile phone has a large focal length and a large back focus. In order to place the telephoto module in a smaller mobile phone thickness and space, a prism is needed to fold and bend the light path. Generally, a prism with a folded light path needs to have an aperture made inside and then several parts are glued together. Figure 1 As shown, prisms 1' and 2' are glued together. Conventional methods design an internal aperture 3' directly on the gluing surface, then glue them together. The fluidity of the glue fills the gap between the internal aperture and the glued prism, thus forming a glued prism. Due to the thickness of the internal aperture, the gluing gap 4' is the sum of the thickness of the glue layer and the internal aperture, typically measured in micrometers. Larger gluing gaps 4' block more light, resulting in more severe diffraction and stray light.

[0003] The above information disclosed in this Background section is included only for enhancement of understanding of the background of the disclosure and therefore it may contain information that does not form the prior art that is currently known to a person of ordinary skill in the art. Utility Model Content

[0004] The technical problem to be solved by the present invention is to provide a combined prism that can be used in a camera module of an electronic device, in order to address the defect in the prior art that the glue seam defect will generate diffraction stray light.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] On the one hand, a combined prism is constructed, including a first prism and a second prism to be connected, and an aperture located between the first prism and the second prism; the first prism includes a first connecting surface, the second prism includes a second connecting surface connected to the first connecting surface, and the first connecting surface and the second connecting surface are connected by gluing; a first groove matching the aperture is provided on the first connecting surface, and the aperture is provided in the first groove to reduce the gap between the first connecting surface and the second connecting surface, and the thickness of the glue in the gap is less than a preset thickness to reduce the generation of diffraction stray light of the camera module.

[0007] Furthermore, in the combined prism of the present invention, the first groove is a contoured groove that is opened by etching and imitates the shape of the aperture.

[0008] Furthermore, in the combined prism described in the present invention, the depth of the first groove is not less than the thickness of the aperture.

[0009] Furthermore, in the combined prism described in the present invention, the aperture is an optical structure that is provided in the first groove by silk-screen printing or coating, with the edge blocking light and the center transmitting light.

[0010] Furthermore, in the combined prism described in the present invention, the thickness of the glue in the gap is less than 500 nm.

[0011] On the second aspect, a combined prism is constructed, including a first prism and a second prism to be connected, and an aperture located between the first prism and the second prism; the first prism includes a first connecting surface, the second prism includes a second connecting surface connected to the first connecting surface, and the first connecting surface and the second connecting surface are connected by gluing; a second groove matching the aperture is provided on the first connecting surface, and a third groove matching the aperture is provided on the second connecting surface, and the aperture is simultaneously provided in the second groove and the third groove to reduce the gap between the first connecting surface and the second connecting surface, and the thickness of the glue in the gap is less than the preset thickness to reduce the generation of diffraction stray light of the camera module.

[0012] Furthermore, in the combined prism of the present invention, the second groove and the third groove are contoured grooves that are opened by etching and imitate the shape of the aperture.

[0013] Furthermore, in the combined prism of the present invention, the depths of the second groove and the third groove are both less than the thickness of the aperture.

[0014] Furthermore, in the combined prism described in the present invention, the thickness of the glue in the gap is less than 500 nm.

[0015] The combined prism of the present invention has the following beneficial effects: in the present invention, a groove matching the aperture is provided on the connecting surface of the first prism, and the aperture is provided in the groove, thereby significantly reducing the gap between the connecting surface of the first prism and the connecting surface of the second prism, generating less light blocking, and reducing the generation of diffraction stray light in the camera module of the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only embodiments of the present invention. Those skilled in the art can obtain other drawings based on the provided drawings without inventive work.

[0017] Figure 1It is a schematic diagram of the prism structure in the prior art;

[0018] Figure 2 This is a structural diagram of the first embodiment of the combined prism of the utility model;

[0019] Figure 3 This is a side view of the first embodiment of the combined prism of the utility model;

[0020] Figure 4 is a schematic diagram of the connection surface of the first prism in the first embodiment;

[0021] Figure 5 This is a side view of the second embodiment of the combined prism of the utility model;

[0022] Among them, the reference numerals in the figures are:

[0023] 1. First prism; 2. Second prism; 3. Aperture; 4. Slit; 11. First groove; 12. Second groove; 21. Third groove. DETAILED DESCRIPTION

[0024] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be given below with reference to the relevant drawings. Typical embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, rather than limitations on the technical solutions of the present application. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other.

[0025] Example 1

[0026] refer to Figure 2-4 The combined prism of this embodiment can be used in a camera module of an electronic device, including but not limited to a mobile phone, a tablet, a PC, etc. The combined prism includes a first prism 1 and a second prism 2 to be connected, and an aperture 3 located between the first prism 1 and the second prism 2.

[0027] The first prism 1 includes a first connecting surface, and the second prism 2 includes a second connecting surface connected to the first connecting surface. The first connecting surface is provided with a first groove 11 that matches the aperture 3. The aperture 3 is positioned within the first groove 11 to reduce the gap 4 between the first and second connecting surfaces. The first and second connecting surfaces are connected by gluing. Because the thickness of the aperture 3 does not need to be considered, the glue thickness in this embodiment can be less than 500nm. In other words, the gap 4 between the first and second connecting surfaces is filled with glue, and the thickness of the gap 4 is less than 500nm.

[0028] In this embodiment, the first groove 11 extends along the edge of the first connecting surface of the first prism 1. Of course, a groove may be provided on the second connecting surface of the second prism 2 to mount the aperture 3.

[0029] Among them, the depth H1 of the first groove and the thickness H2 of the aperture are preferably such that the depth H1 is not less than (greater than or equal to) the thickness H2. Of course, the depth H1 may be slightly less than H2, as long as the gap 4 between the first connecting surface and the second connecting surface can be reduced to an appropriate size so as not to cause the generation of stray light.

[0030] The aperture 3 can be an existing independent aperture, installed in the first groove 11, and then glued to the first and second connecting surfaces. However, the aperture in this embodiment is not an independent aperture. Specifically, the aperture 3 in this embodiment is an optical structure that is applied to the surrounding walls of the first groove 11 via silk screen printing or coating, blocking light at the edges and transmitting light at the center. The term "independent aperture" in this context refers to an aperture that exists independently of other structures. Unlike the iris formed by silk screen printing or coating mentioned in this embodiment, the iris in this embodiment is attached to the surrounding walls of the first groove 11 and cannot exist independently.

[0031] In this embodiment, the first groove 11 is a profiled groove etched to mimic the shape of the aperture 3. This embodiment etches the shape of the internal aperture 3 on the surface of the laminated glass prism 1, and the thickness of the internal aperture 3 is determined by the etching depth. This effectively reduces the width of the bonding gap 4 during the subsequent bonding process, thereby reducing light blocking by the bonding gap 4 and alleviating the generation of diffraction stray light from the camera module.

[0032] Specifically, the etching process involves applying photosensitive adhesive to the bonding surface (i.e., the first connecting surface) of the prism 1, exposing the shape of the internal aperture 3 through laser exposure, and then removing the cured glue in the exposed area through a debonding process. The uncured area is still protected by glue. The prism 1 is immersed in an etching solution (strong acid / strong base), and an etching area is formed on the bonding surface of the prism 1 through the action of the etching solution. The depth of the etching is controlled by controlling the time. The other areas of the bonding surface are protected by the photoresist and will not form etching conditions. After etching is completed, an etching area in the shape of the internal aperture 3 is formed on the bonding surface of the prism 1, and its depth is generally at the micron level, that is, a first groove 11 is formed. After etching is completed, the prism 1 forms an internal aperture 3 on the side walls of the etched concave area by printing or coating. When making the internal aperture 3, it is necessary to ensure that the thickness of the aperture 3 (the so-called thickness refers to the dimension in the direction in which light is allowed to pass) does not exceed the concave area produced by etching. After the internal aperture 3 is fabricated, the prism 1 is bonded to the other half of the prism 2 using photosensitive adhesive. Since the internal aperture 3 is formed within the etched first groove 11, the bonding gap 4 is only the thickness of the adhesive, significantly smaller than that in conventional bonding techniques. A smaller bonding gap reduces diffracted stray light, ultimately reducing background light intensity during camera module capture and improving image clarity. Diffraction simulation of the bonding gap indicates that a width of gap 4 below 500 nm minimizes diffracted stray light.

[0033] The beneficial effect of this embodiment is: this embodiment adopts etching technology to etch the shape of the internal aperture 3 on the first connecting surface of the first prism 1, and the internal aperture 3 is established inside the first prism 1 and does not protrude from the gluing surface, so that the gluing gap 4 can be greatly reduced, thereby generating less light blocking.

[0034] It should be understood that the shape of the prism in the drawings of this embodiment is only for illustration, and in practice the shape of the prism is not limited.

[0035] Example 2

[0036] refer to Figure 5 The combined prism of this embodiment includes a first prism 1 and a second prism 2 to be connected, and an aperture 3 located between the first prism 1 and the second prism 2. The first prism 1 includes a first connecting surface, and the second prism 2 includes a second connecting surface connected to the first connecting surface. The first connecting surface and the second connecting surface are connected by gluing, and the glue thickness is less than 500nm.

[0037] The difference between this embodiment and embodiment 1 is that, on the one hand, this embodiment is provided with a second groove 12 matching the aperture 3 on the first connecting surface, and on the other hand, a third groove 21 matching the aperture 3 is provided on the second connecting surface, and the aperture 3 is provided in both the second groove 12 and the third groove 21 to reduce the gap 4 between the first connecting surface and the second connecting surface.

[0038] The aperture 3 in this embodiment is an independent optical structure with light blocking at the edge and light transmitting at the center, which is the same as the aperture in the prior art.

[0039] Similarly, the second groove 12 and the third groove 21 in this embodiment are also shaped grooves that imitate the shape of the aperture 3 opened by etching, except that the depths of the second groove 12 and the third groove 21 in this embodiment are both less than the thickness of the aperture 3.

[0040] To sum up, the combined prism of the present invention has the following beneficial effects: in the present invention, a groove matching the aperture is provided on the connecting surface of the first prism, and the aperture is provided in the groove, thereby greatly reducing the gap between the connecting surface of the first prism and the connecting surface of the second prism, generating less light blocking and reducing the generation of diffraction stray light in the camera module of the electronic device.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0042] Terms containing ordinal numbers, such as "first" and "second," used in this specification may be used to describe various components, but these components are not limited by these terms. These terms are used solely to distinguish one component from another. For example, a first component may be named a second component, and similarly, a second component may be named a first component, without departing from the scope of the present invention.

[0043] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which are all within the protection of the present invention.

Claims

1. A combined prism can be used in a camera module of an electronic device, characterized in that: The combined prism includes a first prism and a second prism that need to be connected, and an aperture located between the first prism and the second prism; the first prism includes a first connecting surface, the second prism includes a second connecting surface connected to the first connecting surface, and the first connecting surface and the second connecting surface are connected by gluing; a first groove matching the aperture is provided on the first connecting surface, and the aperture is provided in the first groove to reduce the gap between the first connecting surface and the second connecting surface, and the thickness of the glue in the gap is less than a preset thickness to reduce the generation of diffraction stray light of the camera module.

2. The combined prism according to claim 1, wherein: The first groove is a profile groove that is opened by etching and imitates the shape of the aperture.

3. The combined prism according to claim 1, wherein: The depth of the first groove is not less than the thickness of the aperture.

4. The combined prism according to claim 1, wherein: The aperture is an optical structure that is set in the first groove by silk-screen printing or coating, and has an edge that blocks light and a center that transmits light.

5. The combined prism according to claim 1, wherein: The thickness of the glue in the gap is less than 500 nm.

6. A combined prism, characterized in that: It includes a first prism and a second prism that need to be connected, and an aperture located between the first prism and the second prism; the first prism includes a first connecting surface, the second prism includes a second connecting surface connected to the first connecting surface, and the first connecting surface and the second connecting surface are connected by gluing; the first connecting surface is provided with a second groove matching the aperture, and the second connecting surface is provided with a third groove matching the aperture, and the aperture is simultaneously provided in the second groove and the third groove to reduce the gap between the first connecting surface and the second connecting surface, and the thickness of the glue in the gap is less than the preset thickness to reduce the generation of diffraction stray light of the camera module.

7. The combined prism according to claim 6, wherein: The second groove and the third groove are contoured grooves formed by etching and imitating the shape of the aperture.

8. The combined prism according to claim 6, wherein: The depths of the second groove and the third groove are both smaller than the thickness of the aperture.

9. The combined prism according to claim 6, wherein: The thickness of the glue in the gap is less than 500 nm.

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