Lens driving device, camera device, and electronic equipment

Abstract

The present invention provides a lens driving device, a camera device, and an electronic device that are less likely to produce ghosting. The lens driving device (1) comprises a bracket (19), a base (25), and a housing (11). A bracket opening (190) of the bracket (19) is provided on the rear side of a carrier opening (153). The bracket opening (190) is provided with an inclined portion (194) such that the opening size increases toward the rear. The inclined portion (194) is provided with a plurality of ridge-like portions, and a sawtooth-like portion (195) extends forward and backward along the inclination of the inclined portion (194).

Description

Technical Field

[0001] The present invention relates to a lens driving device, a camera device, and an electronic device used in electronic devices such as smartphones. Background Art

[0002] Among lens drive devices that combine OIS (Optical Image Stabilizer) and AF (Auto Focus) functions, there is a periscope lens drive device. In a periscope lens drive device, the lens and image sensor are arranged side by side in a direction perpendicular to the incident direction of light from the subject. Light from the subject is reflected by a prism or a mirror, with the optical axis bent before entering the lens. The light transmitted through the lens is converted into an image signal by the image sensor. Patent Document 1 discloses technology related to this type of lens drive device.

[0003]

Prior art literature

[0004] [Patent Literature]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-139223A Summary of the Invention

[0006] [Problems to be solved by the invention]

[0007] However, in a periscope lens driving device, light exiting the lens body and entering the image sensor includes not only light directly entering the image sensor but also light reflected from other objects and then entering the image sensor, which may cause ghosting.

[0008] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a lens driving device in which ghosting is less likely to occur.

[0009]

Methods for solving the problem

[0010] In order to solve the above-mentioned problems, a lens driving device as a preferred embodiment of the present invention can support the lens body in a movably manner, and can configure an image sensor on the rear side of the lens body, and has an opening between the lens body and the image sensor for passing and limiting the light from the lens body to reach the image sensor, and the opening has an inclined portion such that the size of the opening increases as it moves toward the rear side, and the inclined portion has a plurality of ridge-like portions and a serrated portion extending frontward and rearward along the inclination of the inclined portion.

[0011] In this embodiment, adjacent ridge-like portions may be parallel to each other.

[0012] Alternatively, the angle of the top of the ridge-like portion may be an acute angle or an obtuse angle.

[0013] Furthermore, the opening may be formed to be narrow in the vertical direction and wide in the horizontal direction, and the serrated portion may be provided on at least one of the upper side and the lower side.

[0014] Furthermore, a second opening may be further provided on the rear side of the opening, wherein the second opening has an inverted inclined surface in which the size of the opening decreases toward the rear side.

[0015] Alternatively, it may be provided with a movable part, an intermediate component and a fixed part, wherein the movable part has a carrier capable of mounting the lens body and is supported on the intermediate component so as to be movable relative to the intermediate component, the intermediate component is supported on the fixed part so as to be movable together with the movable part relative to the fixed part, and the opening is formed in the intermediate component.

[0016] In addition, it is provided with a movable part, an intermediate part and a fixed part, the movable part has a carrier capable of mounting the lens body, is supported on the intermediate part so as to be movable relative to the intermediate part, the intermediate part is supported on the fixed part so as to be movable together with the movable part relative to the fixed part, and the second opening is formed in the fixed part.

[0017] A camera device according to another preferred embodiment of the present invention is characterized by including the above-mentioned lens driving device.

[0018] Another preferred embodiment of the present invention provides an electronic device including the camera device described above.

[0019] Effects of the Invention

[0020] The lens drive device of the present invention can movably support a lens body and can be configured with an image sensor on the rear side of the lens body. An opening is provided between the lens body and the image sensor to pass and limit light from the lens body to the image sensor. The opening has an inclined portion that increases in size as it moves toward the rear side. The inclined portion has a plurality of ridges and a serrated portion extending forward and backward along the inclination of the inclined portion. Therefore, light that would cause ghosting is reflected by the serrated portion, making it difficult for it to enter the image sensor, and the amount of light itself is also attenuated. Thus, a lens drive device that is less likely to produce ghosting can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view of a smartphone 9 equipped with a camera device 2 including a lens driving device 1 according to one embodiment of the present invention.

[0022] Figure 2 yes Figure 1 A perspective view of the lens driving device 1.

[0023] Figure 3 It is from Figure 2 A three-dimensional diagram after removing the housing 11.

[0024] Figure 4 yes Figure 2 FIG. 1 is an enlarged cross-sectional view of the bracket opening 190 and the surrounding of the housing opening 110 . DETAILED DESCRIPTION

[0025] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Figure 1 As shown, a camera device 2 including a lens driving device 1 according to an embodiment of the present invention is housed in a smartphone 9 .

[0026] The camera device 2 includes an image sensor 3 , a reflective mirror 4 that reflects light from a subject, a lens 5 that guides the light reflected by the reflective mirror 4 into the image sensor 3 , and a lens driving device 1 that drives the lens 5 .

[0027] Hereinafter, the direction in which light from the subject enters the center of the reflector 4 will be referred to as the Y direction, as appropriate. Furthermore, the direction in which light reflected by the reflector 4 travels toward the lens 5 will be referred to as the X direction, and the direction perpendicular to both the Y and X directions will be referred to as the Z direction. Furthermore, the +Y side will sometimes be referred to as the upper side, the -Y side as the lower side, the -X side as the front side, the +X side as the rear side, the +Z side as the left side, and the -Z side as the right side.

[0028] The lens body 5 is formed by inserting a lens into a lens barrel. The lens drive device 1 includes a movable portion, an intermediate component, and a fixed portion. The lens body 5 is mounted on a carrier 15 that is part of the movable portion. The intermediate component is supported by suspension wires 24 and can move relative to the fixed portion along with the movable portion in the X and Z directions. The movable portion is supported by a leaf spring 14 and can move relative to the intermediate component in the Y direction.

[0029] The movable portion includes a carrier 15, on which a first OIS coil 16 is mounted. One end of a leaf spring 14 is mounted on the carrier 15. The intermediate component includes a bracket 19, on which an OIS magnet 18 and an AF magnet 20 are mounted. The other end of the leaf spring 14 is mounted on the bracket 19. In addition, one end of a suspension wire 24 is fixed to an extension portion extending beyond the other end of the leaf spring 14. The fixed portion includes a housing 11 and a base 25, on which an AF coil 22 is mounted. In addition, a second OIS coil (not shown) is mounted on the fixed portion. The other end of the suspension wire 24 is fixed to the base 25.

[0030] The housing 11 and base 25 are combined to form a frame. The housing 11 is box-shaped, with a housing opening 110 defined in the center of its rear sidewall. A notch 120 extending from the bottom to the top is defined in the center of the front sidewall of the housing 11. Notch 120 also cuts through a portion of the upper wall. The image sensor 3 is located behind the housing opening 110. A second OIS coil (not shown) is located inside the upper wall of the housing 11.

[0031] The base 25 is a rectangular plate. A raised portion 250 extending upward is provided on the rear edge of the base 25, and a reflector mounting portion is provided on the front upper surface. The raised portion 250 defines a base opening 251. Wiring is also formed on the base 25. The AF coils 22 are provided on the left and right upper surfaces of the base 25.

[0032] The bracket 19 includes a frame portion 191 surrounding a bracket opening 190 through which light emitted from the lens 5 passes, and sidewall portions 192 extending forward from the left and right peripheral edges of the frame portion 191. The bracket 19 is located above the base 25 and is formed so as to entirely surround the carrier 15. OIS magnets 18 are provided on the left and right upper surfaces of the sidewall portions 192. AF magnets 20 are provided on the left and right lower surfaces of the sidewall portions 192, facing the AF coil 22.

[0033] The carrier 15 has a cylindrical body 151 that is flattened at the top and bottom. Furthermore, the upper and lower front portions of the cylindrical body 151 are removed to form side portions. A carrier opening 153 is formed at the rear end of the cylindrical body 151. The lens 5 is embedded in and supported by the cylindrical body 151 from the front of the carrier 15. On the outer surfaces of the left and right side portions of the carrier 15, the first OIS coil 16 is disposed opposite the OIS magnet 18.

[0034] The suspension wires 24 are metal cables extending in the Y direction and are provided outside each of the four corners of the bracket 19. Together with the movable portion, the suspension wires 24 support the intermediate member so that it can move in the X and Z directions while floating from the base 25.

[0035] The leaf spring 14 is formed of a cable-like elongated arm portion that bends in the X and Z directions. The leaf spring 14 is formed of one arm portion from one end to the other end. The arm portion of the extension portion is formed in a ring shape, and one end of the suspension wire 24 is fixed at the center.

[0036] Next, the opening between the lens body 5 and the image sensor 3 will be described. Figure 4 As shown, on the rear side of the lens body 5, there are a carrier opening 153, a bracket opening 190, a base opening 251 and a shell opening 110 in order from the front side, and on the rear side, there is a Figure 4The image sensor 3 is not shown in the figure. In addition, in this embodiment, the lower part of the opening is described, but the upper part is also provided with the same structure. In addition, the left and right parts are not provided with the same structure, but the same structure can also be provided.

[0037] The carrier opening 153 of the carrier 15 is provided right behind the lens body 5. The carrier opening 153 is provided with an inclined surface 155 such that the size of the opening increases toward the rear.

[0038] On the rear side of the carrier opening 153, there is a bracket opening 190 of the bracket 19. The bracket opening 190 is provided with an inclined portion 194 such that the size of the opening increases toward the rear. The bracket opening 190 is formed to be narrow in the vertical direction and widen in the left-right direction. The front end of the inclined portion 194 is located above the rear end of the inclined surface 155. The slope of the inclined portion 194 is greater than the slope of the inclined surface 155. The inclined portion 194 is provided with a plurality of ridges extending forward and backward along the inclination of the inclined portion 194. When viewed from the Y direction, the ridges of the serrated portion 195 extend along the X direction, and adjacent ridges are parallel to each other. The top angle of the ridge of the serrated portion 195 when the YZ plane is cut is preferably an angle other than 90 degrees, that is, an acute angle or an obtuse angle. In the present embodiment, it is formed at an obtuse angle.

[0039] A rising portion 250 of the base 25 is provided on the rear side slightly separated from the bracket opening 190, forming a base opening 251. A reversed inclined surface 254 is provided at the upper end of the rising portion 250. The reversed inclined surface 254 is positioned slightly below the inclined portion 194 as a whole and faces the upper front side, in this embodiment, at a 45-degree angle.

[0040] The housing 11 is provided almost adjacent to the rear side of the rising portion 250 , and the housing opening 110 is provided immediately behind the base opening 251 . The upper end of the housing opening 110 is located below the upper end of the rising portion 250 .

[0041] The light that becomes a ghost from the lens body 5 is first removed at the carrier opening 153. Then, the light that passes through the carrier opening 153 and enters the inclined portion 194 of the bracket opening 190 is attenuated during reflection. Furthermore, the inclined portion 194 becomes a serrated portion 195, and the incident light is reflected in a direction different from the incident direction, thereby making it difficult for ghosting to occur. At this time, when the serrated portion 195 is 90 degrees, when it is reflected twice, it becomes oriented in the same direction as the original incident light. Although the reflected light is oriented in a direction different from the incident light, this effect is weakened, but because it is reflected twice, the attenuation effect caused by the reflection still exists. In the case of obtuse angles or acute angles, even if it is reflected twice, it will not be reflected in the same direction as the incident light, so the effect of making it difficult for ghosting to occur is further improved.

[0042] Next, light that passes through the bracket opening 190 and enters the inverted inclined surface 254 of the base opening 251 is not reflected toward the rear side, i.e., the image sensor 3 side, but rather toward the front side, i.e., the lens 5 side, or the subject side. The upper end of the housing opening 110 is located below the upper end of the rising portion 250, and in this embodiment, does not provide a particularly significant effect on ghost image reduction.

[0043] As a result, the amount of light that would cause ghosting, which would otherwise enter the image sensor 3, is reduced due to the opening in the middle of the lens body 5. Specifically, the light that would otherwise cause ghosting is reflected by the serrated portion 195, making it less likely to enter the image sensor 3. Even if it does enter, the amount of light is attenuated. Furthermore, the light is reflected from the front side by the inverted inclined surface 254, making it even less likely to enter the image sensor 3. This makes it possible to provide a lens drive device that is less likely to cause ghosting.

[0044] The first OIS coil 16 provided on the movable portion faces the OIS magnet 18 provided on the intermediate member. When current flows through the first OIS coil 16, an electromagnetic force in the Y direction is generated in the first OIS coil 16. This causes the movable portion to move in the Y direction relative to the intermediate member.

[0045] The OIS magnet 18, located on the intermediate member, faces the second OIS coil (not shown) located on the fixed portion. When current flows through the second OIS coil 13, an electromagnetic force in the Z direction is generated. This reaction causes the intermediate member, along with the movable portion, to move relative to the fixed portion in the Z direction.

[0046] The AF magnet 20 provided on the intermediate member and the AF coil 22 provided on the fixed portion face each other. When current flows through the AF coil 22, a thrust in the X direction is generated. This reaction causes the intermediate member, along with the movable portion, to move relative to the fixed portion in the X direction.

[0047] In addition, with respect to the lens driving device 1 in this embodiment, a periscope lens driving device 1 is described, but it can also be used for a lens driving device 1 in which the optical axis is not bent. In addition, the lens body 5 may not include a lens barrel, in which case the lens is directly mounted on the carrier 15. In addition, the movable portion does not need to move in three directions, and may move in two directions, or move in one direction. In this case, the action of replacing the reflector 4 or the prism can also be performed. In addition, the ridge-like portions of the serrated portion 195 do not need to be parallel to each other, and may be a shape that widens from the front side to the rear side, or a shape that narrows. In addition, the serrated portion 195 and the inverted inclined surface 254 may be provided as the same component. In addition, the serrated portion 195 may be provided on a component other than the bracket 19, and the inverted inclined surface 254 may be provided on a component other than the base 25.

[0048]

Explanation of symbols

[0049] 1. Lens drive device; 2. Camera device; 3. Image sensor; 4. Reflector; 5. Lens body; 9. Smartphone; 11. Housing; 14. Leaf spring; 15. Carrier; 16. First coil for OIS; 18. Magnet for OIS; 19. Bracket; 20. Magnet for AF; 22. Coil for AF; 24. Suspension wire; 25. Base; 110. Housing opening; 254. Inverted inclined surface; 120. Notch; 151. Tubular body; 153. Carrier opening; 155. Inclined surface; 190. Bracket opening; 191. Frame portion; 192. Side wall portion; 194. Inclined portion; 195. Serrated portion; 250. Standing portion; 251. Base opening.

Claims

1. A lens driving device capable of movably supporting a lens body and arranging an image sensor on the rear side of the lens body, wherein: A bracket opening is provided between the lens body and the image sensor for passing and limiting light from the lens body to the image sensor, a base opening is provided on the rear side of the bracket opening, and a carrier opening is provided on the front side of the bracket opening. The carrier opening is arranged at the rear of the lens body and has an inclined surface with the opening becoming larger toward the rear. The bracket opening has an inclined portion such that the size of the opening becomes larger as it moves toward the rear side. The inclined portion has a plurality of ridge-like portions extending forward and backward along the inclination of the inclined portion. The base opening has an inverted inclined surface such that the size of the opening becomes smaller as it moves toward the rear side. The lens driving device includes a movable portion, an intermediate component, and a fixed portion. The movable portion has a carrier on which the lens body can be mounted, and is supported by the intermediate member so as to be movable relative to the intermediate member. The carrier opening is formed on the carrier, The intermediate member includes a bracket formed so as to surround the carrier, and is supported by the fixed portion so as to be movable together with the movable portion relative to the fixed portion. The bracket includes the bracket opening through which light emitted from the lens body passes. The bracket opening is formed in the bracket, The fixing portion includes a housing and a base as a frame combination, and a rising portion of the base constituting the base opening is provided on the rear side of the bracket opening. The base opening is formed in the base.

2. The lens driving device according to claim 1, wherein: Adjacent ridge-shaped portions are parallel to each other.

3. The lens driving device according to claim 1, wherein: The angle of the top of the ridge-shaped portion is an acute angle or an obtuse angle.

4. The lens driving device according to claim 1, wherein: The bracket opening is formed to be narrow in the vertical direction and wide in the horizontal direction, and the serrated portion is provided on at least one of the upper side and the lower side. 5 . A camera device comprising the lens driving device according to claim 1 . 6 . An electronic device comprising the camera device according to claim 5 .

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