JP6750658B2 - Lens barrel and light receiving device - Google Patents

Description

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

There is known an electronic device in which a conductor member is attached to an end portion of a board mounted in a chassis, a conductive member is arranged between the conductor member and the chassis, and the conductor member and the chassis are electrically connected through the conductive member. (See, for example, Patent Document 1). Further, an electronic camera is known which includes an image pickup unit including an image pickup element that receives a light flux that has passed through a photographing opening, and a dust-proof light transmitting member that closes the photographing opening to prevent dust from passing through the photographing opening. (For example, refer to Patent Document 2).
[Prior Art Document]
[Patent Document]
[Patent Document 1] JP 2008-153179 [Patent Document 2] JP 2004-88374 A

When the second cylinder, which is movable with respect to the first cylinder, is a conductive member, it is necessary to take appropriate measures against static electricity on the second cylinder. If a conductive member for 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 barrel in which the lens is located has conductivity, and is provided coaxially with the first barrel and rotatable with respect to the first barrel. A possible second cylinder and a conductive packing part sandwiched between the first cylinder and the second cylinder and sliding with respect to at least one of the first cylinder and the second cylinder are provided.

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

Note that the above summary of the invention does not enumerate all necessary features of the present invention. Further, a sub-combination of these feature groups can also be an invention.

The schematic sectional drawing of the principal part of the camera 100 is shown. FIG. 3 is a schematic cross-sectional view showing a fixed barrel 30, a zoom ring 34, a packing 38 and a lens side mount 40 in an enlarged manner. It is a typical sectional view which expands and shows packing 38. 4 is a schematic cross-sectional view of a gasket portion 210 and a conductive adhesive layer 220. FIG. 3 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 of the combinations of features described in the embodiments are essential to the solving means of the invention.

FIG. 1 is a schematic sectional view showing a main part of the camera 100. The camera 100 is an interchangeable lens type camera as an example of an imaging device. 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 mounted on the subject side of the camera body 130. The lens unit 120 is an interchangeable lens and is attachable to and detachable from the camera body 130. FIG. 1 shows a state in which 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 barrel 30, a movable barrel 31, and a fixed barrel component 32. The rotary cylinder 33, the zoom ring 34, the packing 36, the packing 38, and the 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 barrel 30, and the movable barrel 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 form a lens system for imaging. Each of the lens 11, the lens 12, the lens 13, and the lens 14 may be a lens group including a plurality of lenses. The subject light that has passed through the lens 11, the lens 12, the lens 13, and the lens 14 is incident on the image sensor provided in the camera body 130. The camera body 130 generates image data of a subject image based on an image pickup signal generated when the image pickup 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 barrel part 32. The fixed barrel part 32 is arranged inside the fixed barrel 30, and the fixed barrel 30 is fixed to the fixed barrel part 32. Therefore, the lens 14 is fixed to the fixed barrel 30.

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

The rotary barrel 33 rotates about the optical axis AX with respect to the fixed barrel 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 moves straight in the optical axis AX direction by the rotation operation of the rotary cylinder 33 and the rotational driving of the lead screw. .. As a result, 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 optical axis AX direction, the angle of view of the optical system and the focus position can be adjusted.

The zoom ring 34 is an example of a movable barrel that is movable with respect to the fixed barrel 30. The zoom ring 34 is movably provided with respect to the fixed barrel 30 by a user operation. The zoom ring 34 is an operation ring that rotates with respect to the fixed barrel 30 when operated by the 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 optical axis AX direction, and the focal length of the lens system changes.

For example, when the zoom ring 34 rotates about the optical axis AX, the rotary cylinder 33 rotates about the optical axis AX mechanically or by motor control according to the rotation of the zoom ring 34. In response to the rotation of the rotary cylinder 33, the cam mechanism obtains a driving force for moving the lens holding frame 21, the lens holding frame 22, and the lens holding frame 23 straight in the optical axis AX direction, and the lenses 11, 12, and 13 are driven by the light. Move in the axis AX direction. The lens holding frame 21 is fixed to the moving barrel 31 that moves in the optical axis AX direction by the rotating operation of the rotating barrel 33, and the moving barrel 31 moves in the optical axis AX direction according to the rotation of the rotating barrel 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 be moved not only by operating the zoom ring 34 but also by a driving force of a motor included in the lens unit 120 or the camera body 130 to move in the optical axis AX direction. For example, when the release button is half-pressed in the camera body 130, the lens that is in focus among the lens 11, the lens 12, and the lens 13 is moved in the optical axis AX direction by driving the motor.

The movable barrel 31 moves in the optical axis AX direction with respect to the zoom ring 34. Further, the zoom ring 34 rotates about the optical axis AX with respect to the moving barrel 31. A packing 36 is provided between the zoom ring 34 and the movable barrel 31. The packing 36 contacts the zoom ring 34 and the movable barrel 31, fills the gap between the zoom ring 34 and the movable barrel 31, and movably supports the zoom ring 34 with respect to the movable barrel 31.

The packing 36 has contractibility. The material of the moving cylinder 31 is resin, for example. The packing 36 is, for example, artificial leather. The packing 36 is attached to the inner side surface of the zoom ring 34 and has a sliding surface that slides on the outer side surface of the movable barrel 31. The sliding surface of the packing 36 has naps. Therefore, while allowing the movable barrel 31 to slide in the optical axis AX direction with respect to the zoom ring 34, it is possible to prevent dust from entering the fixed barrel 30 while passing between the zoom ring 34 and the movable barrel 31. Can be suppressed. Since the packing 36 has a contracting property, the packing 36 comes into contact with the moving 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 barrel 30 have conductivity. The zoom ring 34 and the fixed barrel 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 barrel 30, and prevents dust from entering the inside of the fixed barrel 30 from between the zoom ring 34 and the fixed barrel 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. Therefore, the zoom ring 34 is movably supported by the fixed barrel 30 while maintaining a state of being electrically connected to the fixed barrel 30 via the packing 38.

The lens side mount 40 has conductivity. The lens side mount 40 is a metal member. The fixed barrel 30 is fixed to the lens side mount 40 while being in contact with the lens side mount 40. Therefore, the fixed barrel 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 barrel 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 included 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 type mounting structure, and the lens unit 120 and the camera body 130 are integrated. The lens-side mount 40 and the camera-side mount 50 each include an electrical connection portion in addition to a mechanical engagement portion, and realizes power supply from the camera body 130 to the lens unit 120 and mutual communication.

Further, 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 of metal, the texture of the lens unit 120 is enhanced. The zoom ring 34 is electrically grounded to the fixed barrel 30 via a packing 38 that restrains dust from entering the fixed barrel 30 and movably supports the fixed barrel 30. Therefore, the zoom ring 34 can be electrically grounded without separately providing a grounding conductive member for grounding the zoom ring 34. Moreover, generation of static electricity can be suppressed. In addition, since it is not necessary to provide the grounding conductive member, the space can be effectively used accordingly. Further, the number of parts when assembling the lens unit 120 can be reduced. Moreover, the process of assembling the components of the lens unit 120 can be simplified.

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

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

The packing 38 has a sliding sheet 200, a gasket portion 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 barrel 30. It is provided.

The sliding sheet 200 has a thickness of 0.1 mm, for example. The total thickness of the gasket portion 210 and the conductive adhesive layer 220 is, for example, 0.3 mm or more. The total thickness of the gasket portion 210 and 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 210 has conductivity and cushioning properties. The gasket portion 210 is in contact with the conductive adhesive layer 220 and the sliding sheet 200. The gasket portion 210 has a cushioning property higher than that of the sliding sheet 200. For example, the gasket portion 210 has a shrinkage higher than that of the sliding sheet 200. The structure of the gasket portion 210 will be described later.

The sliding sheet 200 is provided between the fixed cylinder 30 and the gasket portion 210 and slides on 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 barrel 30.

The sliding sheet 200 has a slidability higher 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 structure of the sliding sheet 200 will be described later.

Since the gasket portion 210 has cushioning properties and the sliding sheet 200 that contacts the fixed barrel 30 has slidability, the zoom ring 34 can slide on the fixed barrel 30 while applying an appropriate pressing pressure.

FIG. 4 is a schematic cross-sectional view of the gasket portion 210 and the conductive adhesive layer 220. The gasket portion 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 resin. The metal mesh layer included in the conductive mesh layer 420 may be formed in polyester resin. The conductive cushion layer 410 includes a foamed resin portion 412 and a conductive plated portion 418. The material of the foamed resin part 412 may be, for example, an olefinic 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 of a plurality of holes 413, an outer side surface 415 that contacts the sliding sheet 200, and an inner side surface 416 that contacts the conductive mesh layer 420.

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

Since the conductive cushion layer 410 has the foamed resin layer, the packing 38 has elasticity as a whole. Therefore, it is possible to apply an appropriate pressing pressure to the fixed barrel 30 while improving the adhesion of the packing 38 to the fixed barrel 30.

FIG. 5 is a schematic 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 this order from the gasket portion 210 side toward the fixed cylinder 30 side, the conductive adhesive layer 520 and the conductive woven fabric portion 510.

The conductive adhesive layer 520 is an adhesive layer containing a conductive filler and a resin having an adhesive property. 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 cloth portion 510 is, for example, a conductive cloth obtained by subjecting a fiber cloth to metal plating. The surface of the conductive woven fabric portion 510, which is in contact with the fixed cylinder 30, is treated with a carbon coating. The surface 511 provides a sliding surface for the fixed barrel 30. Therefore, the slidability of the packing 38 with respect to the fixed cylinder 30 can be improved. 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 adhered to the zoom ring 34 by the conductive adhesive layer 220 and is pressed against the fixed barrel 30 while being sandwiched between the zoom ring 34 and the fixed barrel 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 subjected to the carbon coating treatment, 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, it is possible to electrically connect the zoom ring 34 to the fixed barrel 30 while improving the dustproof and moistureproof property and the operability and slidability of the zoom ring 34.

In addition, in the present embodiment, the movable cylinder 31 is a resin member. However, the moving barrel 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 of the present embodiment is an example of an operation ring operated by the user. The operation ring may be a zoom ring or a focus ring that receives a focus adjustment operation. For example, the lens unit 120 may have a focus ring made of a metal member instead of the zoom ring 34 or in addition to the zoom ring 34. When the focus ring made of a metal member is provided, a packing having the same structure as the packing 38 may be provided between the focus ring and the fixed barrel 30.

Further, in this embodiment, the packing 38 is fixed to the zoom ring 34 and slides with respect to the fixed barrel 30. However, the same structure as the packing 38 can be applied to the packing fixed to the fixed barrel 30 and sliding with respect to the zoom ring 34.

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

The image pickup 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. Further, in various electronic devices other than the light receiving device, a fixed tube having conductivity, a movable tube that is provided coaxially with the fixed tube that is conductive and is rotatable with respect to the fixed tube, and a fixed tube and a movable tube are provided. A lens barrel including a conductive packing part that is sandwiched and slides on at least one of the fixed barrel and the movable barrel can be applied.

Although the present invention has been described above using the embodiment, the technical scope of the present invention is not limited to the scope described in the above embodiment. It is apparent to those skilled in the art that various changes 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 execution order of each process such as operation, procedure, step, and step in the devices, systems, programs, and methods shown in the claims, the specification, and the drawings is "preceding" or "prior to". It should be noted that the output of the previous process can be realized in any order unless the output of the previous process is used in the subsequent process. The operation flow in the claims, the description, and the drawings is described by using “first,” “next,” and the like for the sake of convenience, but it is essential to carry out in this order. Not a thing.

11, 12, 13, 14 Lens 21, 22, 23, 24 Lens holding frame 30 Fixed barrel 31 Moving barrel 32 Fixed barrel part 33 Rotating barrel 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 Foam resin portion 413 Hole portion 414 Side surface 415 Outer surface 416 Inner surface 418 Conductive plating section 510 Conductive woven cloth section 511 Surface 520 Conductive adhesive layer

Claims (9)

A first cylinder made of metal,
A second cylinder made of metal and rotatable with respect to the first cylinder;
It is arranged between the first cylinder and the second cylinder, contacts the first cylinder and the second cylinder, and is slidable with respect to at least one of the first cylinder and the second cylinder. Conductive packing part ,
Lens barrel equipped with. It has a camera body with an image sensor and a detachable mount.
The lens barrel according to claim 1, wherein the first barrel is fixed to the mount portion. The lens barrel according to claim 2, wherein the mount portion is made of metal. With multiple lenses,
The lens barrel according to any one of claims 1 to 3, wherein at least one of the plurality of lenses moves in the optical axis direction when the second barrel rotates. The lens barrel according to any one of claims 1 to 4, wherein at least a part of the second cylinder is arranged on an inner peripheral side of the first cylinder. The lens barrel according to claim 5, wherein the first barrel, the packing portion , and the second barrel are arranged in this order in a radial direction around the optical axis. The lens barrel according to any one of claims 1 to 6, wherein the packing portion is an annular member. The lens barrel according to claim 1, wherein the packing portion has contractibility. An imaging device comprising the lens barrel according to claim 1.

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