Camera module and method for manufacturing the camera module

Abstract

A camera module capable of ensuring electrical connection between two members including a movable member is provided. [Solution] The camera module comprises a first member having a first connection portion, a second member having a second connection portion, a flexible conductive wire having a first end connected to the first connection portion and a second end connected to the second connection portion, and a conductive adhesive in contact with the first connection portion and the first end, and the first member and the second member include movable members.

Description

[Technical Field]

[0001] The present disclosure relates to a camera module and a method for manufacturing the camera module. [Background technology]

[0002] Patent Document 1 discloses a power module. In this power module, a case contains a substrate, a power semiconductor chip, and bonding wires, and the case is filled with gel. The case and the substrate are connected to each other by the bonding wires. The gel seals the substrate, the power semiconductor chip, and the bonding wires. The connection portion of the bonding wire is covered with a resin having a hardness higher than that of the gel. This makes it possible to prevent the bonding wires from breaking (abstract). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-7343 Summary of the Invention [Problem to be solved by the invention]

[0004] In a camera module equipped with a polymer lens, a voltage is applied to the connection portion of the polymer lens, causing the lens portion of the polymer lens to deform. When the lens portion of the polymer lens is deformed, the shape of the outer frame portion of the polymer lens changes, and the position at which the connection portion of the polymer lens is disposed changes. Therefore, in the camera module, in order to apply a voltage to the polymer lens without inhibiting the deformation of the lens portion of the polymer lens, the connection portion of the polymer lens and the connection portion of a member other than the polymer lens are electrically connected to each other by a flexible gold wire. One end of the gold wire is wire-bonded to the connection portion of the polymer lens. The other end of the gold wire is wire-bonded to the connection portion of the member other than the polymer lens. The gold wire deforms in accordance with the change in the position at which the connection portion of the polymer lens is disposed, and does not inhibit the deformation of the polymer lens.

[0005] Heat cannot be applied to the polymer lens. Therefore, when one end of the gold wire is wire-bonded to the connection portion of the polymer lens, heat cannot be applied to the connection portion of the one end of the gold wire and the polymer lens. When the other end of the gold wire is wire-bonded to the connection portion of a member other than the polymer lens, heat cannot be applied to the connection portion of the other end of the gold wire and the member other than the polymer lens. Therefore, the electrical connection between the one end of the gold wire and the connection portion of the polymer lens is likely to be insufficient. The electrical connection between the other end of the gold wire and the connection portion of the member other than the polymer lens is also likely to be insufficient.

[0006] When the technology disclosed in Patent Document 1 for preventing bonding wire breakage is applied to a gold wire connection between a polymer lens connection and a component other than the polymer lens, the gel prevents the gold wire from deforming in response to changes in the position of the polymer lens connection. Furthermore, the resin is non-conductive. Therefore, while the resin helps ensure a mechanical connection between one end of the gold wire and the polymer lens connection and a mechanical connection between the other end of the gold wire and the component other than the polymer lens, it does not help ensure an electrical mechanical connection between the one end of the gold wire and the polymer lens connection, nor does it help ensure an electrical connection between the other end of the gold wire and the component other than the polymer lens connection.

[0007] In view of this problem, an aspect of the present disclosure provides a camera module that can ensure electrical connection between two members, including a movable member, for example. [Means for solving the problem]

[0008] A camera module of a first aspect of the present disclosure comprises a first member having a first connection portion, a second member having a second connection portion, a flexible conductive wire having a first end connected to the first connection portion and a second end connected to the second connection portion, and a conductive adhesive in contact with the first connection portion and the first end, wherein the first member and the second member include movable members.

[0009] A manufacturing method for a camera module of a second aspect of the present disclosure includes: (a) connecting a first end of a conductive wire to a first connection portion provided on a first member and connecting a second end of the conductive wire to a second connection portion provided on a second member; and (b) contacting the first connection portion and the first end with a conductive adhesive, wherein the first member and the second member include movable members. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view schematically illustrating a camera module according to a first embodiment. [Figure 2] FIG. 1 is a cross-sectional view schematically illustrating a camera module according to a first embodiment. [Figure 3] 1 is a perspective view schematically illustrating a polymer lens, a holder, a gold wire, and a cured product of silver paste that are provided in the camera module of the first embodiment. FIG. [Figure 4] FIG. 4 is an enlarged perspective view of a part of FIG. 3. [Figure 5] FIG. 4 is an enlarged perspective view of a part of FIG. 3. [Figure 6] 6 is a flowchart showing a procedure for electrically connecting a polymer lens and a holder provided in the camera module of the first embodiment to each other. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the drawings, the same or equivalent elements are designated by the same reference numerals, and redundant description will be omitted.

[0012] 1. First embodiment 1.1 Camera module Fig. 1 is a perspective view schematically illustrating a camera module according to a first embodiment, and Fig. 2 is a cross-sectional view schematically illustrating the camera module according to the first embodiment.

[0013] The camera module 1 of the first embodiment shown in FIGS. 1 and 2 focuses incident light to form an image, captures the formed image, and outputs an image signal corresponding to the captured image.

[0014] As shown in FIGS. 1 and 2, the camera module 1 includes an imaging lens 11 and an imaging element 12.

[0015] The imaging lens 11 collects incident light and forms an image.

[0016] The image sensor 12 captures the formed image and outputs an image signal corresponding to the captured image.

[0017] 1.2 Imaging lens As shown in FIGS. 1 and 2, the imaging lens 11 includes lenses 21, 22, 23, 24, 25, and 26, an infrared cut filter 27, a top cover 28, a holder 29, and a barrel 30.

[0018] The lenses 21, 22, 23, 24, 25, and 26, the infrared cut filter 27, and the image sensor 12 are arranged along the optical axis of the imaging lens 11, and are arranged in the order listed from the object side to the image side.

[0019] The lenses 21, 22, 23, 24, 25, and 26 transmit incident light and focus the incident light on the imaging element 12. As a result, the lenses 21, 22, 23, 24, 25, and 26 form an image on the imaging element 12. The imaging lens 11 may include lenses other than the lenses 21, 22, 23, 24, 25, and 26.

[0020] The infrared cut filter 27 is disposed between the lens 26 and the imaging element 12. The infrared cut filter 27 transmits light that has passed through the lenses 21, 22, 23, 24, 25, and 26. The infrared cut filter 27 cuts out infrared rays from the light that is transmitted through it.

[0021] The top cover 28 is placed on the holder 29. The top cover 28 covers the holder 29. The top cover 28 houses the lens 21.

[0022] The holder 29 is disposed on the barrel 30. The holder 29 holds the lens 22. The holder 29 has a plate-like shape. A hole 29a is formed in the holder 29. The hole 29a accommodates the lens 22.

[0023] The barrel 30 holds the lenses 23, 24, 25, and 26 and the infrared cut filter 27. The barrel 30 has a cylindrical shape. Therefore, a hole 30a is formed in the barrel 30. The hole 30a accommodates the lenses 23, 24, 25, and 26 and the infrared cut filter 27.

[0024] The lens 22 is a polymer lens with an adjustable focal length. The polymer lens 22 has a shape corresponding to an input signal and a focal length corresponding to the input signal. As a result, by adjusting the signal input to the polymer lens 22, the polymer lens 22 can be deformed, and the focal length of the polymer lens 22 can be adjusted. As a result, by adjusting the signal input to the polymer lens 22, the focal position of the imaging lens 11 can be adjusted.

[0025] The lenses 21, 23, 24, 25 and 26 are plastic lenses with fixed focal lengths, but the lenses 21, 23, 24, 25 and 26 may also be glass lenses.

[0026] 1.3 Connection between polymer lens and holder Fig. 3 is a perspective view schematically illustrating a polymer lens, a holder, a gold wire, and a cured product of silver paste provided in the camera module of the first embodiment. Figs. 4 and 5 are enlarged perspective views of a part of Fig. 3.

[0027] 3, 4, and 5, the camera module 1 includes a polymer lens 22, a holder 29, gold wires 41 and 42, and cured silver paste materials 51, 52, 53, and 54. Some of the cured silver paste materials 51, 52, 53, and 54 may be omitted.

[0028] As shown in Figures 3, 4, and 5, the polymer lens 22 includes first connectors 61 and 62. The polymer lens 22 has a shape corresponding to a signal input between the first connectors 61 and 62, and a focal length corresponding to the input signal. Therefore, the first connectors 61 and 62 are disposed at positions corresponding to the signal. Therefore, the positions at which the first connectors 61 and 62 are disposed change when the signal changes. The first connectors 61 and 62 are patterns made of a conductor. The pattern has a rectangular planar shape. The pattern may have a planar shape other than a rectangular planar shape.

[0029] As shown in Figures 3, 4, and 5, the holder 29 has second connection portions 71 and 72. The holder 29 outputs a signal to be input to the polymer lens 22 from between the second connection portions 71 and 72. The second connection portions 71 and 72 are patterns made of a conductor. The pattern has a rectangular planar shape. The pattern may have a planar shape other than a rectangular planar shape. The pattern is formed by laser direct structuring (LDS). The pattern may also be formed by a formation method other than LDS.

[0030] As shown in FIG. 4 , the gold wire 41 has a first end 81, a second end 82, and an intermediate portion 83. The first end 81 is connected to the first connecting portion 61. The second end 82 is connected to the second connecting portion 71. The intermediate portion 83 is located between the first end 81 and the second end 82. The gold wire 41 is a conductive wire. This allows the gold wire 41 to electrically connect the first connecting portion 61 and the second connecting portion 71 to each other. The gold wire 41 is flexible. Therefore, the gold wire 41 deforms in response to changes in the position of the first connecting portion 61, and does not hinder the deformation of the polymer lens 22. The gold wire 41 may be replaced with a conductive wire other than a gold wire.

[0031] As shown in FIG. 5 , the gold wire 42 has a first end 91, a second end 92, and an intermediate portion 93. The first end 91 is connected to the first connecting portion 62. The second end 92 is connected to the second connecting portion 72. The intermediate portion 93 is located between the first end 91 and the second end 92. The gold wire 42 is a conductive wire. This allows the gold wire 42 to electrically connect the first connecting portion 62 and the second connecting portion 72 to each other. The gold wire 42 is flexible. Therefore, the gold wire 42 deforms in response to changes in the position of the first connecting portion 62 and does not hinder the deformation of the polymer lens 22. The gold wire 42 may be replaced with a conductive wire other than a gold wire.

[0032] The gold wire 41 electrically connects the first connection portion 61 and the second connection portion 71 to each other, and the gold wire 42 electrically connects the first connection portion 62 and the second connection portion 72 to each other, so that the gold wires 41 and 42 transmit the signal output by the holder 29 and input the transmitted signal to the polymer lens 22.

[0033] In the camera module 1, the set of the first member and the second member electrically connected to each other by the gold wires 41 and 42 is a set of the polymer lens 22, which is a movable member that can move relative to a fixed member, and the holder 29, which is a fixed member. The polymer lens 22 may be replaced with a movable member other than the polymer lens 22. For example, the polymer lens 22 may be replaced with an actuator other than the polymer lens 22. The polymer lens 22 may be replaced with a member other than a lens, etc. The holder 29 may be replaced with a fixed member other than the holder 29.

[0034] The cured silver paste 51 is placed on the first connecting portion 61 and covers the first end 81 connected to the first connecting portion 61. As a result, the cured silver paste 51 comes into contact with the first connecting portion 61 and the first end 81. The cured silver paste 51 is a conductive adhesive. As a result, the cured silver paste 51 bonds the first connecting portion 61 and the first end 81 to each other, mechanically connects the first connecting portion 61 and the first end 81 to each other to reinforce the connection point, and electrically connects the first connecting portion 61 and the first end 81 to each other. The cured silver paste 51 may be replaced with a conductive adhesive other than the cured silver paste 51.

[0035] The first end 81 is connected to the first connecting portion 61 by wire bonding to the first connecting portion 61. However, heat cannot be applied to the polymer lens 22. Therefore, when the first end 81 is wire bonded to the first connecting portion 61, heat cannot be applied to the first end 81 and the first connecting portion 61. Therefore, the direct electrical connection between the first end 81 and the first connecting portion 61 is likely to be insufficient. However, the cured silver paste 51 electrically connects the first end 81 and the first connecting portion 61 to each other, so that the electrical connection between the first end 81 and the first connecting portion 61 can be sufficient even if the direct electrical connection between the first end 81 and the first connecting portion 61 becomes insufficient.

[0036] The cured silver paste 52 is placed on the second connection portion 71 and covers the second end 82 connected to the second connection portion 71. As a result, the cured silver paste 52 comes into contact with the second connection portion 71 and the second end 82. The cured silver paste 52 is a conductive adhesive. As a result, the cured silver paste 52 bonds the second connection portion 71 and the second end 82 to each other, mechanically connects the second connection portion 71 and the second end 82 to each other to reinforce the connection point, and electrically connects the second connection portion 71 and the second end 82 to each other. The cured silver paste 52 may be replaced with a conductive adhesive other than the cured silver paste 52.

[0037] The second end 82 is connected to the second connecting portion 71 by wire bonding to the second connecting portion 71. However, heat cannot be applied to the polymer lens 22. Therefore, when the second end 82 is wire bonded to the second connecting portion 71, heat cannot be applied to the second end 82 and the second connecting portion 71. Therefore, the direct electrical connection between the second end 82 and the second connecting portion 71 is likely to be insufficient. However, the cured silver paste 52 electrically connects the second end 82 and the second connecting portion 71 to each other, so that the electrical connection between the second end 82 and the second connecting portion 71 can be sufficient even if the direct electrical connection between the second end 82 and the second connecting portion 71 becomes insufficient.

[0038] The cured silver paste 53 is placed on the first connecting portion 62 and covers the first end 91 connected to the first connecting portion 62. As a result, the cured silver paste 53 comes into contact with the first connecting portion 62 and the first end 91. The cured silver paste 53 is a conductive adhesive. As a result, the cured silver paste 53 bonds the first connecting portion 62 and the first end 91 to each other, mechanically connects the first connecting portion 62 and the first end 91 to each other to reinforce the connection point, and electrically connects the first connecting portion 62 and the first end 91 to each other. The cured silver paste 53 may be replaced with a conductive adhesive other than the cured silver paste 53.

[0039] The first end 91 is connected to the first connecting portion 62 by wire bonding to the first connecting portion 62. However, heat cannot be applied to the polymer lens 22. Therefore, when the first end 91 is wire bonded to the first connecting portion 62, heat cannot be applied to the first end 91 and the first connecting portion 62. Therefore, the direct electrical connection between the first end 91 and the first connecting portion 62 is likely to be insufficient. However, the cured silver paste 53 electrically connects the first end 91 and the first connecting portion 62 to each other, so that the electrical connection between the first end 91 and the first connecting portion 62 can be sufficiently maintained even if the direct electrical connection between the first end 91 and the first connecting portion 62 becomes insufficient.

[0040] The cured silver paste 54 is placed on the second connecting portion 72 and covers the second end 92 connected to the second connecting portion 72. As a result, the cured silver paste 54 comes into contact with the second connecting portion 72 and the second end 92. The cured silver paste 54 is a conductive adhesive. As a result, the cured silver paste 54 bonds the second connecting portion 72 and the second end 92 to each other, mechanically connects the second connecting portion 72 and the second end 92 to each other to reinforce the connection point, and electrically connects the second connecting portion 72 and the second end 92 to each other. The cured silver paste 54 may be replaced with a conductive adhesive other than the cured silver paste 54.

[0041] The second end 92 is connected to the second connecting portion 72 by wire bonding to the second connecting portion 72. However, heat cannot be applied to the polymer lens 22. Therefore, when the second end 92 is wire bonded to the second connecting portion 72, heat cannot be applied to the second end 92 and the second connecting portion 72. Therefore, the direct electrical connection between the second end 92 and the second connecting portion 72 is likely to be insufficient. However, the cured silver paste 54 electrically connects the second end 92 and the second connecting portion 72 to each other, so that the electrical connection between the second end 92 and the second connecting portion 72 can be sufficient even if the direct electrical connection between the second end 92 and the second connecting portion 72 becomes insufficient.

[0042] The hardened silver paste materials 51 and 52 contact the first end portion 81 and the second end portion 82, respectively, but do not contact the middle portion 83. As a result, the hardened silver paste materials 51 and 52 do not hinder the deformation of the gold wire 41 in response to changes in the position where the first connection portion 61 is disposed.

[0043] The hardened silver paste materials 53 and 54 contact the first end 91 and the second end 92, respectively, but do not contact the intermediate portion 93. As a result, the hardened silver paste materials 53 and 54 do not hinder the gold wire 42 from deforming in response to changes in the position where the first connection portion 62 is disposed.

[0044] 1.4 Flow of connecting polymer lens to holder When the camera module 1 is manufactured, the polymer lens 22 and the holder 29 are electrically connected to each other to create an assembly comprising the polymer lens 22 and the holder 29 .

[0045] FIG. 6 is a flowchart showing a procedure for electrically connecting the polymer lens and the holder provided in the camera module of the first embodiment to each other.

[0046] When the polymer lens 22 and the holder 29 are electrically connected to each other, steps S101 and S102 shown in FIG. 6 are performed.

[0047] In step S101, the first end 81, the second end 82, the first end 91, and the second end 92 are wire-bonded to the first connecting portion 61, the second connecting portion 71, the first connecting portion 62, and the second connecting portion 72, respectively. As a result, the first end 81, the second end 82, the first end 91, and the second end 92 are connected to the first connecting portion 61, the second connecting portion 71, the first connecting portion 62, and the second connecting portion 72, respectively. In step S101, no heat is applied to the polymer lens 22 and the holder 29, and load and / or ultrasonic waves are applied to the connection points, thereby connecting the first end 81, the second end 82, the first end 91, and the second end 92 to the first connecting portion 61, the second connecting portion 71, the first connecting portion 62, and the second connecting portion 72, respectively. As a result, deterioration of the polymer lens 22 due to the applied heat can be suppressed. However, since heat is not applied to the connection, the electrical connection is likely to be poor.

[0048] In the subsequent step S102, a pre-hardening fluid of silver paste is applied onto the first connecting portion 61, the second connecting portion 71, the first connecting portion 62, and the second connecting portion 72, and the applied pre-hardening fluid of silver paste is hardened. As a result, hardened silver paste products 51, 52, 53, and 54 are formed. As a result, hardened silver paste product 51 is brought into contact with the first connecting portion 61 and the first end portion 81. Furthermore, hardened silver paste product 52 is brought into contact with the second connecting portion 71 and the second end portion 82. Furthermore, hardened silver paste product 53 is brought into contact with the first connecting portion 62 and the first end portion 91. Furthermore, hardened silver paste product 54 is brought into contact with the second connecting portion 72 and the second end portion 92.

[0049] After the assembly including the polymer lens 22 and the holder 29 is fabricated, the fabricated assembly, lenses 21, 23, 24, 25 and 26, infrared cut filter 27, top cover 28 and barrel 30 are combined to fabricate the camera module 1.

[0050] The present disclosure is not limited to the above-described embodiments, and may be replaced with a configuration that is substantially the same as the configuration shown in the above-described embodiments, a configuration that has the same effect, or a configuration that can achieve the same purpose. [Explanation of symbols]

[0051] 1 camera module 11 Imaging lens 12 Image sensor 21, 22, 23, 24, 25, 26 Lenses 27 Infrared cut filter 28 Top cover 29 Holder 29a hole 30 barrels 30a hole 41,42 Gold wire 51, 52, 53, 54 Hardened silver paste 61,62 First connection part 71,72 Second connection 81 first end 82 Second end 83 Middle section 91 First end 92 Second end 93 Middle section

Claims

1. a first member having a first connection portion; a second member having a second connection portion; a flexible conductor wire having a first end connected to the first connection portion and a second end connected to the second connection portion; a conductive adhesive in contact with the first connection portion and the first end portion; Equipped with The first member and the second member include a movable member. A camera module comprising:

2. The conductive wire is a gold wire. The camera module of claim 1 .

3. The movable member is a polymer lens.

3. The camera module according to claim 1.

4. the conductive adhesive is a first conductive adhesive, a second conductive adhesive in contact with the second connection portion and the second end portion; 3. The camera module according to claim 1.

5. The conductive adhesive is a cured product of silver paste.

3. The camera module according to claim 1.

6. The conductive adhesive bonds the first connection portion and the first end portion to each other and electrically connects the first connection portion and the first end portion to each other.

3. The camera module according to claim 1.

7. the conductor wire has an intermediate portion between the first end and the second end; The conductive adhesive does not contact the middle portion.

3. The camera module according to claim 1.

8. (a) connecting a first end of a conductor wire to a first connection part of a first member and a second end of the conductor wire to a second connection part of a second member; (b) contacting the first connection portion and the first end portion with a conductive adhesive; Including, The first member and the second member include a movable member. A method for manufacturing a camera module.

9. In step (a), the first end is connected to the first connecting portion and the second end is connected to the second connecting portion without applying heat to the movable member. The method of claim 8.

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