JP2010122618A - Lens barrel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it easy to attach the contact member of a lens barrel to a mounting part. <P>SOLUTION: The lens barrel (2) includes: cylindrical members (60, 51) holding a photographic lens (40) therein; a cover member (59) provided for the cylindrical members (60, 51) and located at the end of the cylindrical members (60 and 51) being the emission side of the photographic lens (40) in the direction of the optical axis of the photographic lens (40); and the contact member (56) provided with a lens side contact (55) for communication. The contact member (56) is fixed to the cylindrical members (60, 51) by being sandwiched between the cylindrical members (60, 51) and the cover member (59). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lens barrel including a contact member provided with a contact used for communication with a camera.

Some lens barrels are provided with contacts for transmitting and receiving control signals to and from the camera and for supplying power from the camera. In general, a plurality of contacts are provided integrally as a unitized contact member. And this contact member is being fixed to the mount part by the side of a lens with a screw (for example, refer to patent documents 1).
Japanese Patent No. 3707149

  However, if the contact member is fixed to the lens-side mount portion with a screw, the number of man-hours for fixing the screw is necessary, and the mounting is complicated.

  An object of the present invention is to facilitate attachment of a contact member to a mount portion in a lens barrel.

  The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this.

According to the first aspect of the present invention, a cylindrical member (60, 51) holding the photographing lens (40) inside, an optical axis of the photographing lens (40) provided on the cylindrical member (60, 51). A contact member provided with a cover member (59) disposed at an end of the cylindrical member (60, 51) on the exit side of the photographing lens (40) in the direction and a lens side contact (55) for communication (56), and the contact member (56) is fixed to the cylindrical member (60, 51) by clamping the cylindrical member (60, 51) and the cover member (59). The lens barrel (2) characterized by the above.
The invention according to claim 2 is the lens barrel (2) according to claim 1, wherein the contact member (56) is an outer surface that contacts the inner surface (51g) of the tube member (60, 51). The cylindrical member (60, 51) has the contact member (56) mounted on the inner surface (51g). And a recess (51f) into which the protrusion (56c) is inserted, and the contact member (56) inserts the protrusion (56c) into the recess (51f). In this state, the lens barrel (2) is sandwiched between the step (51d) and the subject side surface of the cover member (59).
A third aspect of the present invention is the lens barrel (2) according to the second aspect, wherein the protrusion (56c) is provided substantially at the center of the outer surface (56d) of the contact member (56). This is a lens barrel (2) characterized by
Note that the configuration described with reference numerals may be improved as appropriate, or at least a part thereof may be replaced with another component.

  According to the present invention, the attachment of the contact member in the lens barrel to the mount portion can be facilitated.

  Embodiments of the present invention will be described below with reference to the drawings. Each figure shown below is provided with an XYZ orthogonal coordinate system for ease of explanation and understanding. In this coordinate system, the direction toward the left side as viewed from the photographer at the position of the camera when the photographer shoots a horizontally long image with the optical axis A being horizontal (hereinafter referred to as a normal position) is defined as the X plus direction. Further, the direction toward the upper side in the normal position is defined as the Y plus direction. Further, the direction toward the subject at the normal position is defined as the Z plus direction.

  FIG. 1 is a longitudinal sectional view of a camera system including a camera (camera body) 1 and a lens barrel 2 according to an embodiment of the present invention coupled to the camera 1. 2 is a rear view of the lens barrel 2 shown in FIG. 1, and FIG. 3 is a front view of the camera 1 shown in FIG. As shown in FIGS. 1 and 3, the camera 1 includes a housing 10 and a body side mount portion 20. The housing 10 is a part that forms the external surface of the camera 1, and is formed in a substantially rectangular parallelepiped box shape, for example, with a metal material or a synthetic resin material.

  An imaging element 12 such as a CCD or CMOS is disposed inside the housing 10 and is mounted in a CCD case 14 supported by a CCD presser plate 13. In the CCD case 14, a cover glass 15 and a low-pass filter 16 are provided in addition to the image sensor 12. A circular opening (hereinafter referred to as a housing opening 11) is formed on the front surface of the housing 10 when viewed from the front in FIG. The front portion of the camera 1 means a portion of the surface of the camera 1 that faces the subject at the time of shooting.

  The body side mount portion 20 forms the camera side of the mount mechanism that connects the camera 1 and the lens barrel 2. The mount portion 20 includes a mount base portion 21 serving as a base of the mount portion 20, a front decoration ring 22 that covers the outer periphery of the mount base portion 21, a claw portion 23 that protrudes from the front decoration ring 22 to the inner peripheral side, and a body side that defines a reference surface The bayonet mount includes a mount fitting plate 24, a lens attaching / detaching pin 26 (shown in FIG. 3), a plurality of contact pins 27 as electrical contacts, a contact block 28 for holding the contact pins 27, and the like.

  The mount base 21 is a member formed of, for example, a black-colored synthetic resin material, and is fixed to the inner side surface of the housing opening 11 of the housing 10. The mount base 21 is provided so as to protrude from the peripheral edge portion of the housing opening 11 formed on the front surface of the housing 10 to the inner diameter side in a collar shape. A mount opening 21 a through which subject light passes is formed at the center of the mount base 21. The mount opening 21a is formed in a circular shape, and can function as a fixed diaphragm. The subject light traveling from the lens barrel 2 toward the camera 1 is guided to the image sensor 12 through the mount opening 21a.

  The front decoration ring 22 is an annular member that extends along the peripheral edge of the housing opening 11, and is formed of, for example, a metal material. The front decoration ring 22 is fixed to the mount base 21 (shown in FIG. 3) by screws V1. The front decoration ring 22 has a function of improving the appearance quality of the camera 1 by making the peripheral edge of the housing opening 11 invisible from the outside. Three mount contact springs 22a are provided between the front decoration ring 22 and the mount base 21 so as to be spaced apart from each other in the circumferential direction, so that the lens-side mount surface is pressed or pulled into the body side. Yes.

  The claw portion 23 is mechanically engaged with a claw portion 52 (see FIG. 2) provided in the mount portion 50 of the lens barrel 2 described later in a state where the lens barrel 2 is mounted on the camera 1. The relative movement of the camera 1 and the lens barrel 2 in the optical axis direction is limited. The claw portions 23 are formed so as to protrude from the inner peripheral surface of the front decoration ring 22 toward the inner diameter side, and for example, three are provided at substantially equal intervals around the optical axis.

  The body-side mount fitting plate 24 is, for example, a plate-like member formed in an annular shape with a metal material, and is fixed to the mount base 21 with screws V2. The body-side mount fitting plate 24 is disposed on the inner diameter side of the front decorative ring 22 when viewed from the front in FIG. The body-side mount fitting plate 24 may be integrated with the housing 10, but is a separate annular member in the present embodiment in order to increase the shape accuracy.

  The surface of the body-side mount fitting plate 24 facing the subject side in the axial direction functions as a mount surface 24a serving as a reference surface that defines the flange back length. Further, the inner peripheral surface 24b of the body-side mount fitting plate 24 is engaged with an outer peripheral surface 57a of a fitting wall portion 57 provided in the lens barrel 2 described later to position the radial position of the lens barrel 2. I do.

  3 is formed so as to protrude from the body side mount fitting plate 24 toward the subject side in the optical axis direction. The lens attaching / detaching pin 26 is fitted into a pin hole 54 (see FIG. 2) provided in the mount portion 50 of the lens barrel 2 in a state where the lens barrel 2 is attached to the camera 1, so that the lens mirror The relative rotation around the optical axis between the tube 2 and the camera 1 is limited.

  The lens attaching / detaching pin 26 is movable between a lens barrel locking position protruding from the mount base 21 and a lens barrel unlocking position accommodated in the mount base 21, and is usually locked by a spring (not shown). Biased to position. A lens attaching / detaching button 26a is provided on the front surface of the housing 10, and the lens attaching / detaching pin 26 can be moved to the unlocked position against a spring by pressing the lens attaching / detaching button 26a.

  The contact pin 27 electrically connects the camera 1 and the lens barrel 2. The contact pin 27 is disposed in a contact block 28 that is curved along the periphery of the mount opening 21 a of the mount base 21. A plurality of contact pins 27 (9 in this embodiment, for example) are arranged adjacent to each other, and are fixed to the contact block 28 by a pressing plate 29. As will be described later, in a state where the lens barrel 2 is mounted on the camera 1, the lens barrel 2 contacts an electrical contact 55 (see FIG. 2) provided in the mount portion 50 of the lens barrel 2. The camera 1 supplies power to the lens barrel 2 using a part of these contacts, and performs electrical communication with the lens barrel 2 using the other part of the contacts.

  The contact pin 27 is provided so as to protrude from a region on the inner diameter side of the mount surface 24a to the subject side in the optical axis direction. The contact pin 27 is a movable contact that can move between a protruding position that protrudes from the mount base 21 and an accommodation position that is accommodated in the mount base 21. Normally, the presser plate 29 and each contact pin in the contact block 28. 27 is biased to the protruding position by a spring 30 provided between the spring 27 and the spring 27. The contact pin 27 is connected to a flexible printed circuit (FPC) 31 via a spring 30, and the FPC 31 is connected to a connector 33 provided on the body side mounting board 32 including the CPU 34.

  Next, the configuration of the lens barrel 2 will be described with reference to FIGS. The lens barrel 2 is detachable from the camera 1 and includes a photographing lens 40, a mount portion 50, and a barrel main body portion 60. The lens barrel main body 60 is, for example, a housing of the lens barrel 2 formed in a cylindrical shape from a synthetic resin material. The photographic lens 40 constitutes an optical system that guides subject light to the image sensor 12 provided in the camera 1, and is housed in the lens barrel main body 60 together with the stop 41. The photographing lens 40 is formed by a plurality of lens groups and includes a zoom lens and a focus lens.

  The lens side mount unit 50 forms the lens side of the mount mechanism that fastens the camera 1 and the lens barrel 2. The lens barrel 2 shown in each drawing including FIG. 1 is an example of a lens barrel that can be attached to the camera 1, and the camera 1 has a mount portion having substantially the same configuration as the lens barrel 2. A plurality of types of lens barrels equipped with can be selectively mounted. The mount 50 of the lens barrel 2 has a mount base 51 and a rear cover 59 disposed at the center thereof. The rear cover 59 is attached to the mount base 51 with screws V3, and has an opening 59a for allowing subject light to pass therethrough.

  The mount base 51 is an annular portion that covers the opening of the lens barrel main body 60 on the camera side in the optical axis direction when the lens barrel 2 is attached to the camera 1, and includes a claw 52, a mount surface 53, a pin The hole 54, the electrical contact 55, and the fitting wall part 57 are provided (refer FIG. 2 about the pin hole 54 and the electrical contact 55).

  The mount surface 53 is an annular surface facing the camera side in the optical axis direction when the lens barrel 2 is attached to the camera 1, and the center axis of the ring substantially coincides with the optical axis A. . The mount surface 53 is in contact with the mount surface 24 a of the camera 1 in a state where the lens barrel 2 is mounted on the camera 1, and becomes a reference surface in the lens barrel 2.

  The claw portion 52 is formed so as to protrude from the outer peripheral surface of the mount surface 53 outward in the radial direction of the lens barrel 2. For example, three claw portions 52 are provided at substantially equal intervals around the optical axis. The claw portion 52 is provided so as to extend in the circumferential direction about the optical axis A, and the tip surface thereof forms a part of the cylindrical surface (arc surface). The pin hole 54 is a portion into which the lens attaching / detaching pin 26 provided in the mount portion 20 of the camera 1 is inserted, and is formed on the surface of the mount base portion 51 facing the camera side in the optical axis direction.

  The electrical contact 55 is a fixed contact fixed to the mount base 51, and is provided at a position that contacts the contact pin 27 provided on the mount unit 20 of the camera 1 when the lens barrel 2 is attached to the camera 1. It has been. The electrical contacts 55 are formed by insert molding and are arranged in a contact block 56 provided on the inner diameter side of the fitting wall portion 57, and a plurality of electrical contacts 55 in the circumferential direction around the optical axis A (in this embodiment, For example, 9) are arranged.

  The contact block 56 is a contact accommodating portion facing the contact block 28 provided on the mount base 21 of the mount portion 20 of the camera 1 described above in a state where the camera 1 and the lens barrel 2 are connected. It extends in the circumferential direction around A. Each electrical contact 55 provided in the contact block 56 is connected to a connector 62 provided on the lens side mounting substrate 61 via, for example, a flexible printed circuit (FPC) 58.

  The fitting wall portion 57 is a portion formed in an annular shape so as to protrude toward the body side of the electrical contact 55 on the inner peripheral side of the mount surface 53. As described above, the outer peripheral surface 57a of the fitting wall portion 57 abuts on the inner peripheral surface 24b of the body-side mount fitting plate 24 of the camera 1 when the lens barrel 2 is mounted on the camera 1, and the lens mirror The relative movement in the radial direction between the tube 2 and the camera 1 is limited. Then, positioning that defines the mounting position of the lens barrel 2 in the radial direction with respect to the camera 1 is performed by the outer peripheral surface 57 a of the fitting wall portion 57 and the inner peripheral surface 24 b of the body-side mount fitting plate 24.

  Next, the contact block 56 and the rear cover 59 will be described in detail. 4 is an exploded vertical sectional view showing a part of the lens barrel 2. FIG. 5 is a rear view of the lens-side mount portion 50 with the rear cover 59 and the contact block 56 removed, and FIG. a) is a schematic plan view of the rear cover 59, and (b) is a schematic perspective view of the contact block 56.

  As shown in FIG. 6 (a), the rear cover 59 is formed of a plate member in a generally annular shape except for having a sector-shaped notch 59b, and has an outer peripheral edge 59c and an inner peripheral edge 59d. ing. The notch 59b is defined by an arcuate surface 59e extending in the circumferential direction and two radial surfaces 59f extending radially outward from both ends of the arcuate surface. Further, the rear cover 59 has three holes 59g that are spaced apart in the circumferential direction so as to receive a screw V3 (see FIG. 1) for attaching the rear cover 59 to the lens side mount base 51. Yes.

  As shown in FIG. 5, the lens-side mount base 51 has three ears 51 a 1, 51 a 2, 51 a 3 that extend radially inward from the radially inner edge of the inner surface 51 g and are evenly spaced in the circumferential direction. Are arranged. Each ear-shaped part 51a1, 51a2, 51a3 has a screw hole 51b for the screw V3 described above. The lens-side mount base 51 extends from the ear-shaped part 51a2 to the ear-shaped part 51a1 and from the ear-shaped part 51a1 to the ear-shaped part 51a3 on the radially inner side of the fitting wall part 57, that is, the radially inner edge. While having the receiving surface 51c, it has the receiving surface 51d extended once once cut | disconnected in the center part to the ear-shaped part 51a3 and the ear-shaped part 51a2. The latter receiving surface 51d is formed so as to recede toward the side opposite to the camera body in the optical axis direction than the receiving surface 51c, as indicated by reference numeral x in FIG. Further, the above-described ear-shaped portions 51a2 and 51a3 are formed with receiving surfaces 51e for receiving the ear-shaped portions of the contact block 56 described later.

  On the other hand, as shown in FIG. 6B, the contact block 56 has a shape that is curved substantially in an arc corresponding to the notch 59 b in the rear cover 59. The contact block 56 has ear-shaped portions 56a that can be placed on the receiving surfaces 51e of the ear-shaped portions 51a2 and 51a3 described above at both ends of the outer surface 56d in the circumferential direction, and a step portion 56b on the outer surface in the radial direction. And a step portion 56d on the inner surface in the radial direction. The step 56b is placed on the receiving surface 51d of the mount base 51, and the arcuate surface 59e in the radial direction of the rear cover 59 is placed on the step 56d. The width of the step portion 56b and the step portion 57d is substantially equal to the distance x shown in FIG.

  Further, the contact block 56 has a protrusion 56c extending outward in the radial direction on a circumferential surface on the outer side in the radial direction. One protrusion 56 c is preferably formed at the center in the circumferential direction of the contact block 56, but a plurality of protrusions 56 c may be provided, for example, or provided over the entire length of the outer periphery of the contact block 56. May be. As shown in FIG. 5, the mount base 51 has a recess 51f corresponding to the protrusion 56c described above at a predetermined position between the ears 51a2 and 51a3. The installation position, shape, number, and the like of the recesses 51f correspond to the protrusions 56c.

  Assembly of the contact block 56 to the mount base 51 of the lens barrel 2 is performed in the following procedure. As shown in FIGS. 4 and 5, the contact block 56 of FIG. 6B is attached to the lens-side mount base 51 before the rear cover 59 is attached, and the protrusion 56 c is formed in the recess 51 f formed in the mount base 51. While being fitted, the stepped portion 56b of the contact block 56 is disposed so as to contact the receiving surface 51d of the mount base 51. At that time, the ear-shaped portion 56 a of the contact block 56 is also brought into contact with the receiving surfaces 51 e provided on the ear-shaped portions 51 a 2 and 51 a 3 of the mount base 51. As a result, the contact block 56 can easily position the predetermined position of the mount base 51.

  6A, the outer peripheral edge 59c of the rear cover 59 is placed on the receiving surface 51c of the mount base 51, and the arc-shaped surface 59e of the notch 59b is mounted on the mount base 51. Is placed on the step portion 56d. In this way, the rear cover 59 is positioned on the mount base 51, and the three screws V3 are threaded through the holes 59g in the rear cover 59 and screwed into the screw holes 51b provided in the ear-shaped portions 51a1 to 51a3 of the mount base 51. To do. In this way, the contact block 56 and the rear cover 59 are attached to the mount base 51 of the lens barrel 2.

  When mounting the lens barrel 2 to which the contact block 56 and the rear cover 59 are attached to the camera 1, the user first moves the camera 1 and the lens barrel 2 relative to each other in the optical axis direction to approach each other. Then, the mount base 51 of the lens barrel 2 is inserted into the inner diameter side of the front ornament ring 22 of the camera 1 so that the mount surfaces 24a and 53 are brought into contact with each other. At this time, each claw portion 52 of the lens barrel 2 is disposed between each claw portion 23 and the claw portion 23 of the camera 1.

  Next, the lens barrel 2 and the camera 1 are relatively rotated around the optical axis so that the positions of the claws 23 and 52 around the optical axis overlap. As a result, the lens barrel 2 is pulled toward the camera by the mount contact spring 22a, and the lens attaching / detaching pin 26 is fitted into the pin hole 54, and the fastening of the camera 1 and the lens barrel 2 is completed. Further, due to this relative rotation, the contact pin 27 and the electrical contact 55 are brought into contact.

  When the lens barrel 2 is attached to the camera 1, the mount surface 53 of the lens barrel 2 and the mount surface 24a of the camera 1 are in contact with each other, and the lens barrel 2 is positioned in the optical axis direction with respect to the camera 1. Is called. Further, the inner peripheral surface 24b of the body-side mount fitting plate 24 and the outer peripheral surface 57a of the fitting wall portion 57 provided on the lens barrel 2 are engaged to position the lens barrel 2 in the radial direction with respect to the camera 1. Is done.

  When the lens barrel 2 is removed from the camera 1, the lens attaching / detaching button 26a shown in FIG. 3 is pushed in the optical axis direction to release the lens attaching / detaching pin 26 from the pin hole 54 shown in FIG. Then, the lens barrel 2 is rotated with respect to the camera 1, the engagement between the claw portions 23 and 52 is released, and the lens barrel 2 is pulled away from the camera.

As described above, this embodiment has the following effects.
(1) The contact block 56 is temporarily mounted at a predetermined position on the lens-side mount base 51, and then the rear cover 59 is placed on the lens-side mount base 51, and the rear cover 59 and the mount base 51 are screwed together. To do. As a result, the contact block 56 is sandwiched between the mount base 51 and the rear cover 59 and fixed to the lens side mount base 51. Since screws are not used for temporary mounting of the contact block 56 itself, the number of screwing steps can be reduced, the strength can be increased, the cost can be reduced, and the degree of freedom in design can be increased.
(2) The contact block 56 includes one protrusion 56c on the outer surface that contacts the inner surface of the lens-side mount base 51, and the lens-side mount base 51 has a receiving surface 51d on which the contact block 56 is placed. And a recess 51f into which the protrusion 56c is inserted, and the contact block 56 is sandwiched between the receiving surface 51d and the rear cover 59 in a state where the protrusion 56c is inserted into the recess 51f. Therefore, the contact block 56 can be easily attached to the lens side mount base 51, and the contact block 56 can be easily removed.
(3) Since the protrusion 56c is provided at substantially the center of the peripheral surface on the radially outer side of the contact block 56, the posture when the contact block 56 is mounted is stabilized, and the assembling work becomes easier.
(4) An arc-shaped step 56d is formed on the radially inner peripheral surface of the contact block 56, and an arcuate surface 59e in the radial direction of the rear cover 59 that defines the notch 59b is placed on the step 56d. Therefore, the holding by the rear cover 59 can be more stably and reliably performed.

The present invention is not limited to the above-described embodiment, and various modifications and changes as described below are possible, and these are also within the scope of the present invention.
(1) In the present embodiment, the contact block 56 is formed with one rectangular protrusion 56c. However, the present invention is not limited to this, and various shapes may be provided.
(2) In the present embodiment, the contact block 56 is curved in an arc shape in the circumferential direction. However, the present invention is not limited to this, and the contact block 56 may have any shape as long as a required electrical contact can be provided.
In addition, although embodiment and a deformation | transformation form can also be used in combination suitably, detailed description is abbreviate | omitted. Further, the present invention is not limited to the embodiment described above.

1 is a longitudinal sectional view of a camera system including a camera body coupled with a lens barrel according to an embodiment of the present invention. It is a rear view of the lens barrel shown in FIG. It is a front view of the camera body shown in FIG. It is a longitudinal cross-sectional view which decomposes | disassembles and shows a part of lens barrel shown in FIG. It is a rear view of the lens side bayonet mount which removed the rear cover and the contact block. (A) is a schematic plan view of a rear cover, (b) is a schematic perspective view of a contact block.

Explanation of symbols

  2: lens barrel, 40: photographing lens, 50: mount portion, 51: mount base, 51c: receiving surface, 51d: receiving surface, 51e: receiving surface, 51f: recessed portion, 51g: inner surface, 55: electrical contact, 56 : Contact block, 56b: step, 56c: protrusion, 56d: outer surface, 59: rear cover, 60: barrel main body

Claims (3)

A cylindrical member for holding the taking lens inside;
A cover member provided on the cylindrical member and disposed at an end of the cylindrical member on the exit side of the photographing lens in the optical axis direction of the photographing lens;
A contact member provided with a lens side contact for communication, and
The contact member is fixed to the cylindrical member by sandwiching the cylindrical member and the cover member;
A lens barrel characterized by The lens barrel according to claim 1,
The contact member has an outer surface that comes into contact with the inner surface of the cylindrical member, and includes a protrusion at at least one location on the outer surface.
The cylindrical member has, on the inner surface, a step portion for placing the contact member, and a concave portion into which the protrusion is inserted,
The contact member is sandwiched between the stepped portion and a subject side surface of the cover member with the protrusion inserted into the recess;
A lens barrel characterized by The lens barrel according to claim 2,
The protrusion is provided at substantially the center of the outer surface of the contact member;
A lens barrel characterized by

Images