JP6432646B2 - Lens barrel and light receiving device - Google Patents

Description

  The present invention relates to a lens barrel and a light receiving device.

2. Description of the Related Art An electronic device is known in which a conductor member is attached to an end portion of a board mounted in a chassis, a conductive member is disposed between the conductor member and the chassis, and the conductor member and the chassis are electrically connected through the conductive member. (For example, refer to Patent Document 1). There is also known an electronic camera including an image pickup unit including an image pickup element that receives a light beam that has passed through a shooting opening, and a dust-proof light transmitting member that closes the shooting opening so as to prevent dust from passing through the shooting opening. (For example, refer to Patent Document 2).
[Prior art documents]
[Patent Literature]
[Patent Document 1] JP 2008-153179 A [Patent Document 2] JP 2004-88374 A

  When the second cylinder movable with respect to the first cylinder is used as the conductive member, it is necessary to take an appropriate countermeasure against static electricity on the second cylinder. If a conductive member for preventing static electricity is added separately, the number of parts increases and the space in the lens barrel is also consumed.

  In the first aspect, the lens barrel has conductivity, and the first tube in which the lens is located inside, has conductivity, is provided coaxially with the first tube, and rotates with respect to the first tube. A possible second cylinder, and a conductive packing portion that is sandwiched between the first cylinder and the second cylinder and slides against at least one of the first cylinder and the second cylinder.

  In a second aspect, an imaging apparatus includes the lens barrel and a main body having a light receiving portion that receives light that has passed through the lens.

  It should be noted that the above summary of the invention does not enumerate all the necessary features of the present invention. In addition, a sub-combination of these feature groups can also be an invention.

A schematic cross-sectional view of the main part of the camera 100 is shown. 4 is an enlarged schematic cross-sectional view showing a fixed cylinder 30, a zoom ring 34, a packing 38, and a lens side mount 40. FIG. 4 is a schematic cross-sectional view showing an enlarged packing 38. FIG. 3 is a schematic cross-sectional view of a gasket part 210 and a conductive adhesive layer 220. FIG. 2 is a schematic cross-sectional view of a sliding sheet 200. FIG.

  Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. In addition, not all the combinations of features described in the embodiments are essential for the solving means of the invention.

  FIG. 1 is a schematic cross-sectional view showing the main part of the camera 100. The camera 100 is an interchangeable lens camera as an example of an imaging apparatus. The camera 100 includes a camera body 130 and a lens unit 120 as an example of a lens barrel. The lens unit 120 is attached to the subject side of the camera body 130. The lens unit 120 is an interchangeable lens and can be attached to and detached from the camera body 130. FIG. 1 shows a state where the lens unit 120 is attached to the camera body 130.

  The lens unit 120 includes a lens 11, a lens 12, a lens 13, a lens 14, a lens holding frame 21, a lens holding frame 22, a lens holding frame 23, a lens holding frame 24, a fixed cylinder 30, a moving cylinder 31, a fixed cylinder part 32, A rotating cylinder 33, a zoom ring 34, a packing 36, a packing 38, and a lens side mount 40 are provided. The lens unit 120 has a substantially cylindrical shape. The appearance of the cylindrical side portion of the lens unit 120 is mainly provided by the zoom ring 34, the fixed cylinder 30, and the movable cylinder 31.

  The lens 11, the lens 12, the lens 13, and the lens 14 are arranged along the optical axis AX. The plurality of lenses 11, the lens 12, the lens 13, and the lens 11 constitute an imaging lens system. Each of the lens 11, the lens 12, the lens 13, and the lens 14 may be a lens group that includes a plurality of lenses. The subject light that has passed through the lens 11, the lens 12, the lens 13, and the lens 14 enters an image sensor provided in the camera body 130. The camera body 130 generates image data of a subject image based on an imaging signal generated when the imaging element receives subject light.

  The lens holding frame 21 holds the lens 11. The lens holding frame 22 holds the lens 12. The lens holding frame 23 holds the lens 13. The lens holding frame 24 holds the lens 14. The lens holding frame 24 is fixed to the fixed cylinder part 32. The fixed cylinder part 32 is disposed inside the fixed cylinder 30, and the fixed cylinder 30 is fixed to the fixed cylinder part 32. Accordingly, the lens 14 is fixed to the fixed cylinder 30.

  The lens 11, the lens 12, and the lens 13 are located on the optical axis side from the outer surface of the fixed cylinder 30, that is, on the inner side of the fixed cylinder 30, and are provided movably with respect to the fixed cylinder 30. The lens 11, the lens 12, and the lens 13 are provided movably in the optical axis AX direction with respect to the fixed cylinder 30. The lens 11 moves in the direction of the optical axis AX while being held by the lens holding frame 21. The lens 12 moves in the direction of the optical axis AX while being held by the lens holding frame 22. The lens 13 moves in the direction of the optical axis AX while being held by the lens holding frame 23.

  The rotating cylinder 33 rotates around the optical axis AX with respect to the fixed cylinder 30. The lens holding frame 21, the lens holding frame 22, and the lens holding frame 23 move in the optical axis AX direction by obtaining a driving force that goes straight in the optical axis AX direction by the rotation operation of the rotary cylinder 33 and the rotational drive of the lead screw. . Thereby, the lens 11, the lens 12, and the lens 13 move in the optical axis AX direction. By moving the lens 11, the lens 12, and the lens 13 in the direction of the optical axis AX, adjustment of the angle of view of the optical system and adjustment of the focus position are realized.

  The zoom ring 34 is an example of a movable cylinder that is movable with respect to the fixed cylinder 30. The zoom ring 34 is provided movably with respect to the fixed cylinder 30 by a user operation. The zoom ring 34 is an operation ring that rotates with respect to the fixed cylinder 30 when operated by a user. The zoom ring 34 receives an operation for adjusting the angle of view from the user. When the user rotates the zoom ring 34 around the optical axis AX, the lens 11, the lens 12, and the lens 13 move in the direction of the optical axis AX, and the focal length of the lens system changes.

  For example, when the zoom ring 34 rotates around the optical axis AX, the rotating cylinder 33 rotates around the optical axis AX by mechanical or motor control according to the rotation of the zoom ring 34. According to the rotation of the rotating cylinder 33, the lens holding frame 21, the lens holding frame 22, and the lens holding frame 23 are driven by the cam mechanism so as to move straight in the optical axis AX direction, and the lens 11, the lens 12, and the lens 13 are light-transmitted. Move in the direction of the axis AX. The lens holding frame 21 is fixed to a moving cylinder 31 that moves in the optical axis AX direction by the rotating operation of the rotating cylinder 33, and the moving cylinder 31 moves in the optical axis AX direction according to the rotation of the rotating cylinder 33. As a result, the lens 11 moves in the optical axis AX direction.

  The lens 11, the lens 12, and the lens 13 can move in the direction of the optical axis AX by receiving not only the operation of the zoom ring 34 but also the driving force of the motor of the lens unit 120 or the camera body 130. For example, when the release button is pressed halfway in the camera body 130, the lens 11, the lens 12, and the lens 13 that are in focus are moved in the optical axis AX direction by driving the motor.

  The moving cylinder 31 moves in the optical axis AX direction with respect to the zoom ring 34. The zoom ring 34 rotates around the optical axis AX with respect to the moving cylinder 31. A packing 36 is provided between the zoom ring 34 and the movable cylinder 31. The packing 36 contacts the zoom ring 34 and the moving cylinder 31 to fill a gap between the zoom ring 34 and the moving cylinder 31 and supports the zoom ring 34 movably with respect to the moving cylinder 31.

  The packing 36 has contractibility. The material of the moving cylinder 31 is, for example, resin. The packing 36 is, for example, artificial leather. The packing 36 is attached to the inner surface of the zoom ring 34 and has a sliding surface that slides on the outer surface of the movable cylinder 31. The sliding surface of the packing 36 has raised hair. Therefore, dust can enter the inside of the fixed cylinder 30 between the zoom ring 34 and the movable cylinder 31 while allowing the movable cylinder 31 to slide in the optical axis AX direction with respect to the zoom ring 34. Can be suppressed. Since the packing 36 has contractibility, the packing 36 comes into contact with the movable cylinder 31 with an appropriate pressing pressure. Therefore, the operability of the zoom ring 34 is not impaired.

  The zoom ring 34 and the fixed cylinder 30 have conductivity. The zoom ring 34 and the fixed cylinder 30 are, for example, metal members. The packing 38 has conductivity. The packing 38 is in contact with the zoom ring 34 and the fixed cylinder 30, and prevents dust from entering the inside of the fixed cylinder 30 from between the zoom ring 34 and the fixed cylinder 30. The packing 38 movably supports the zoom ring 34 with respect to the fixed cylinder 30 while being in contact with the zoom ring 34 and the fixed cylinder 30. Accordingly, the zoom ring 34 is movably supported with respect to the fixed cylinder 30 while maintaining a state where it is electrically connected to the fixed cylinder 30 via the packing 38.

  The lens side mount 40 has conductivity. The lens side mount 40 is a metal member. The fixed cylinder 30 is fixed to the lens side mount 40 in a state where it is in contact with the lens side mount 40. Therefore, the fixed cylinder 30 is electrically connected to the lens side mount 40. Therefore, the zoom ring 34 is electrically connected to the lens side mount 40. Specifically, the zoom ring 34 is electrically connected to the lens side mount 40 via the packing 38 and the fixed cylinder 30.

  The lens side mount 40 provides a mounting portion for mounting the lens unit 120 on the camera body 130. The lens side mount 40 is a so-called mount ring, and is an annular member as a whole. The lens side mount 40 is attached to the camera side mount 50 provided in the camera body 130.

  The camera side mount 50 has conductivity. The camera side mount 50 is a so-called mount ring, and is an annular metal member as a whole. When the lens side mount 40 is attached to the camera side mount 50, the lens side mount 40 is electrically connected to the camera side mount 50.

  The lens side mount 40 is engaged with the camera side mount 50 by, for example, a bayonet mount structure, and the lens unit 120 and the camera body 130 are integrated. Each of the lens side mount 40 and the camera side mount 50 includes an electrical connection portion in addition to the mechanical engagement portion, and realizes power supply from the camera body 130 to the lens unit 120 and mutual communication.

  In the camera body 130, the camera side mount 50 is electrically grounded. The camera-side mount 50 is electrically connected to a reference electrode that provides a reference potential of a power supply unit included in the camera body 130. For example, the camera body 130 has a conductive member such as an internal chassis electrically connected to the reference electrode of the power supply unit, and the camera side mount 50 is electrically connected to the conductive member.

  By making the zoom ring 34 made of metal, the texture of the lens unit 120 is enhanced. The zoom ring 34 is electrically grounded to the fixed cylinder 30 via a packing 38 that suppresses entry of dust into the fixed cylinder 30 and is movably supported with respect to the fixed cylinder 30. Therefore, the zoom ring 34 can be electrically grounded without separately providing a grounding conductive member for grounding the zoom ring 34. In addition, generation of static electricity can be suppressed. Further, since there is no need to provide a grounding conductive member, the space can be used effectively. Further, the number of parts when the lens unit 120 is assembled can be reduced. Moreover, the assembly process of the components of the lens unit 120 can be simplified.

  FIG. 2 is a schematic cross-sectional view showing the fixed cylinder 30, the zoom ring 34, the packing 38, and the lens side mount 40 in an enlarged manner. FIG. 3 is a cross-sectional view schematically showing an enlarged part of the packing 38, the fixed cylinder 30 and the zoom ring 34.

  The tube portion 308 of the fixed tube 30 and the tube portion 348 of the zoom ring 34 are provided so as to overlap in the optical axis AX direction. The tube portion 348 of the zoom ring 34 is located inside the tube portion 308 of the fixed tube 30, and is provided at a position where there is a gap between the tube portion 348 and the fixed tube 30. The packing 38 is an annular member that surrounds the optical axis AX, and is provided so as to fill a gap between the cylindrical portion 348 and the cylindrical portion 308. Thus, the cylinder part 348 is provided coaxially with the cylinder part 308 and is rotatable with respect to the cylinder part 308. The packing 38 is sandwiched between the cylindrical portion 348 and the cylindrical portion 308 and slides relative to the cylindrical portion 308.

  The packing 38 includes a sliding sheet 200, a gasket part 210, and a conductive adhesive layer 220. The sliding sheet 200, the gasket portion 210, and the conductive adhesive layer 220 are arranged in the order of the conductive adhesive layer 220, the gasket portion 210, and the sliding sheet 200 from the outer surface 341 of the zoom ring 34 toward the inner surface 302 of the fixed cylinder 30. Provided.

  The thickness of the sliding sheet 200 is, for example, 0.1 mm. The sum total of the thickness of the gasket part 210 and the thickness of the electrically conductive adhesion layer 220 is 0.3 mm or more, for example. The sum of the thickness of the gasket portion 210 and the thickness of the conductive adhesive layer 220 may be three times or more the thickness of the sliding sheet 200.

  The conductive adhesive layer 220 is an adhesive layer containing a conductive filler and an adhesive resin. The conductive adhesive layer 220 may include, for example, a conductive filler and an acrylic adhesive material. The conductive adhesive layer 220 is in contact with the outer surface 341 of the zoom ring 34 and the gasket portion 210.

  The gasket part 210 has conductivity and cushioning properties. The gasket part 210 is in contact with the conductive adhesive layer 220 and the sliding sheet 200. The gasket part 210 has a cushioning property higher than that of the sliding sheet 200. For example, the gasket part 210 has a higher contractibility than that of the sliding sheet 200. The configuration of the gasket part 210 will be described later.

  The sliding sheet 200 is provided between the fixed cylinder 30 and the gasket portion 210 and slides with the fixed cylinder 30. The sliding sheet 200 is in contact with the gasket portion 210 and the inner side surface 302 of the fixed cylinder 30. The sliding sheet 200 has conductivity and provides a sliding surface for the inner side surface 302 of the fixed cylinder 30.

  The sliding sheet 200 has a higher slidability than that of the gasket portion 210. For example, the sliding sheet 200 has a hardness higher than that of the gasket portion 210, and the sliding surface with respect to the fixed cylinder 30 is smoother than the surface of the gasket portion 210. The configuration of the sliding sheet 200 will be described later.

  Since the gasket portion 210 has cushioning properties and the sliding sheet 200 in contact with the fixed cylinder 30 has sliding properties, the zoom ring 34 can slide with the fixed cylinder 30 while applying an appropriate pressing force.

  FIG. 4 is a schematic cross-sectional view of the gasket part 210 and the conductive adhesive layer 220. The gasket part 210 has a conductive cushion layer 410 and a conductive mesh layer 420. The conductive mesh layer 420 and the conductive cushion layer 410 are provided in the order of the conductive mesh layer 420 and the conductive cushion layer 410 from the conductive adhesive layer 220 side toward the sliding sheet 200 side.

  The conductive mesh layer 420 may include a metal mesh layer formed in the resin. The metal mesh layer included in the conductive mesh layer 420 may be formed in the polyester resin. The conductive cushion layer 410 includes a foamed resin portion 412 and a conductive plating portion 418. The material of the foamed resin portion 412 may be, for example, an olefin-based foamed resin.

  The foamed resin portion 412 has a plurality of hole portions 413 formed by, for example, through-hole processing. The foamed resin portion 412 has a side surface 414 formed by a plurality of hole portions 413, an outer surface 415 that contacts the sliding sheet 200, and an inner surface 416 that contacts the conductive mesh layer 420.

  The conductive plating portion 418 is formed on the side surface 414 and the outer side surface 415 of the foamed resin portion 412 by, for example, metal plating. The conductive plating portion 418 is formed so as to cover the side surface 414 and the outer side surface 415. Therefore, the conductive plating part 418 is electrically connected to the conductive mesh layer 420. The contact sliding sheet 200 is provided in contact with the conductive plating portion 418 formed on the outer side surface 415. Therefore, the sliding sheet 200 is electrically connected to the conductive mesh layer 420.

  Since the conductive cushion layer 410 has a foamed resin layer, the packing 38 has stretchability as a whole. Therefore, an appropriate pressing pressure can be applied to the fixed cylinder 30 while improving the adhesion of the packing 38 to the fixed cylinder 30.

  FIG. 5 is a schematic cross-sectional view of the sliding sheet 200. The sliding sheet 200 has a conductive adhesive layer 520 and a conductive woven fabric portion 510. The conductive adhesive layer 520 and the conductive woven fabric portion 510 are provided in the order of the conductive adhesive layer 520 and the conductive woven fabric portion 510 from the gasket portion 210 side to the fixed tube 30 side.

  The conductive adhesive layer 520 is an adhesive layer containing a conductive filler and a resin having adhesiveness. The conductive adhesive layer 520 is in contact with the conductive plated portion 418 and the conductive woven fabric portion 510 formed on the outer surface 415 of the gasket portion 210.

  The conductive woven fabric portion 510 is, for example, a conductive cloth obtained by performing metal plating on a fiber cloth. The surface 511 on the side where the fixed cylinder 30 contacts in the conductive woven fabric portion 510 is subjected to carbon coating treatment. The surface 511 provides a sliding surface for the fixed cylinder 30. Therefore, the slidability of the packing 38 with respect to the fixed cylinder 30 can be enhanced. Further, the durability of the conductive woven fabric portion 510 can be enhanced by the carbon layer formed on the surface 511 by the carbon coating treatment.

  As described above, the packing 38 is bonded to the zoom ring 34 with the conductive adhesive layer 220 and is pressed against the fixed cylinder 30 while being sandwiched between the zoom ring 34 and the fixed cylinder 30. Since the gasket part 210 has the foamed resin part 412, the packing 38 can be brought into close contact with the fixed cylinder 30, and the packing 38 is pressed against the fixed cylinder 30 with an appropriate pressure. Since the surface 511 of the sliding sheet 200 is carbon coated, the surface 511 of the sliding sheet 200 becomes hard, and the coefficient of friction with the fixed cylinder 30 can be reduced. Therefore, according to the packing 38, the zoom ring 34 can be electrically connected to the fixed cylinder 30 while improving the dustproof and moistureproof property, the operability and the slidability of the zoom ring 34.

  In the present embodiment, the movable cylinder 31 is a resin member. However, the movable cylinder 31 may be a metal member. When the movable cylinder 31 is a metal member, a conductive packing may be applied instead of the packing 36. For example, instead of the packing 36, a packing having the same configuration as the packing 38 may be applied.

  The zoom ring 34 according to the present embodiment is an example of an operation ring operated by a user. The operation ring may be a focus ring that accepts a focus adjustment operation in addition to the zoom ring. For example, the lens unit 120 may have a metal member focus ring instead of or in addition to the zoom ring 34. In the case where a focus ring made of a metal member is provided, a packing having the same configuration as the packing 38 may be provided between the focus ring and the fixed cylinder 30.

  In the present embodiment, the packing 38 is fixed to the zoom ring 34 and slides with respect to the fixed cylinder 30. However, the same configuration as the packing 38 can be applied to the packing fixed to the fixed cylinder 30 and sliding with respect to the zoom ring 34.

  Further, in the present embodiment, as an example of the image pickup apparatus, the lens interchangeable camera 100 has been taken up and described. However, the imaging device is a concept including a camera other than an interchangeable lens camera such as a single-lens reflex camera. For example, the imaging apparatus is a concept including various devices having an imaging function, such as a non-lens exchangeable camera and a video camera.

  The imaging device is an example of a light receiving device. A lens barrel having the same configuration as the lens unit 120 can be applied to a light receiving device that does not have an imaging function. Also, in various electronic devices other than the light receiving device, there are a fixed cylinder having conductivity, a movable cylinder having conductivity and provided coaxially with the fixed cylinder, and rotatable with respect to the fixed cylinder, and a fixed cylinder and a movable cylinder. A lens barrel including a conductive packing portion that is sandwiched and slides against at least one of the fixed cylinder and the movable cylinder can be applied.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  The order of execution of each process such as operations, procedures, steps, and stages in the apparatus, system, program, and method shown in the claims, the description, and the drawings is particularly “before” or “prior to”. It should be noted that the output can be realized in any order unless the output of the previous process is used in the subsequent process. Regarding the operation flow in the claims, the description, and the drawings, even if it is described using “first”, “next”, etc. for convenience, it means that it is essential to carry out in this order. It is not a thing.

11, 12, 13, 14 Lens 21, 22, 23, 24 Lens holding frame 30 Fixed cylinder 31 Moving cylinder 32 Fixed cylinder component 33 Rotating cylinder 34 Zoom ring 36 Packing 38 Packing 40 Lens side mount 50 Camera side mount 100 Camera 120 Lens Unit 130 Camera body 200 Sliding sheet 210 Gasket portion 220 Conductive adhesive layer 302 Inner side surface 308 Tube portion 341 Outer side surface 348 Tube portion 410 Conductive cushion layer 420 Conductive mesh layer 412 Foamed resin portion 413 Hole portion 414 Side surface 415 Outer side surface 416 Inner side surface 418 conductive plating portion 510 conductive woven portion 511 surface 520 conductive adhesive layer

Claims (12)

A first tube made of metal and having a lens positioned inside;
A second cylinder made of metal and rotatable relative to the first cylinder by a user operation ;
A conductive sliding member that is sandwiched between the first cylinder and the second cylinder to fill a gap, and slides on at least one of the first cylinder and the second cylinder ;
A lens barrel comprising: The lens barrel is attachable to and detachable from a main body having a light receiving portion that receives light that has passed through the lens,
A metal lens side mount for being attached to and detached from the main body,
The lens barrel according to claim 1, wherein the first cylinder is fixed to the lens side mount. 3. The lens barrel according to claim 1, wherein when the second cylinder moves relative to the first cylinder , the lens moves in the optical axis direction. The first cylinder and the second cylinder are formed in a cylindrical shape having the optical axis of the lens as a central axis,
The other end of the second tube in the optical axis direction is disposed on the inner peripheral side of the one end of the first tube in the optical axis direction,
4. The lens barrel according to claim 1, wherein the sliding member is sandwiched between an inner peripheral surface of the one end and an outer peripheral surface of the other end. 5. The lens barrel has a substantially cylindrical shape centered on the optical axis of the lens,
The lens most diameter larger outer peripheral surface of the barrel, the lens barrel according to any one of 4 composed claim 1 between the first cylinder and the second cylinder. Are disposed inside the first cylinder, a rotary cylinder rotatable relative to the first cylinder,
When the second cylinder is rotated relative to the first cylinder, said rotary cylinder by a mechanical or motor control is rotated relative to the first cylinder,
When the rotary cylinder with respect to the first cylinder is rotated, the lens barrel according to any one of claims 1 to 5, wherein the lens is moved in the optical axis direction. The sliding member, the lens barrel according to any one of claims 1 to 6 which is an annular member surrounding the rotation axis of the second cylinder. A first tube made of metal and having a lens positioned inside;
A second cylinder made of metal and movable relative to the first cylinder;
A conductive sliding member that is sandwiched between the first cylinder and the second cylinder to fill a gap, and slides on at least one of the first cylinder and the second cylinder;
With
The sliding member is
A conductive gasket part;
A lens having a conductive sliding sheet portion provided between one of the first tube and the second tube and the gasket portion and sliding relative to one of the first tube and the second tube. A lens barrel. The gasket part has a cushioning property higher than the cushioning property of the sliding sheet part,
The lens barrel according to claim 8 , wherein the sliding sheet portion has a sliding property higher than a sliding property of the gasket portion. The lens barrel according to any one of claims 1 to 9 ,
A light receiving device comprising: a main body having a light receiving portion that receives light that has passed through the lens. The light receiving device according to claim 10 , wherein the first tube is electrically connected to the main body. The main body is
A power supply,
A reference electrode for providing a reference potential of the power supply unit;
A conductive member electrically connected to the reference electrode;
With
It said first tube includes a light receiving device according to claim 10 or 11 is electrically connected to the conductive member.

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