JP2592641Y2 - Device for attaching and detaching a camera body and an interchangeable lens, an interchangeable lens that can be attached to and detached from the camera body, and a camera body that can attach and detach an interchangeable lens - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for attaching and detaching an interchangeable lens between a camera body of an interchangeable lens camera.

[0002]

2. Description of the Related Art In recent years, in a camera system, an electric element or an electronic element has been incorporated into accessories such as a camera body and an interchangeable lens for higher functions and automation. Power supply of the camera body and the accessory such as an interchangeable lens, standardization of GN D, for transmission such as electrical information, need occurs to obtain electrical coupling between the camera body and the accessory such as an interchangeable lens.

Conventionally, as a device for obtaining this electrical coupling,
The positioning pins provided on the camera body and the fitting recesses provided on the interchangeable lens-side mount made of metal provided on the interchangeable lens are fitted to hold the mounted state of the camera body and the interchangeable lens. There has been an interchangeable lens mounting device that obtains electrical coupling between the camera body and the interchangeable lens by contact between the camera body side mount and the interchangeable lens side mount.

FIG. 3 is a view showing a conventional interchangeable lens attaching / detaching apparatus. FIG. 3A is a front view of the periphery of a fitting recess 51a provided in the interchangeable lens-side mount 51 as viewed from the front, and FIG. 3B is a diagram showing a positioning pin 2 made of metal fitted into the fitting recess 51a. FIG. 3 is a cross-sectional view of the positioning pin 2 cut in a longitudinal direction in a state. As is well known, when mounting the interchangeable lens, first, the interchangeable lens side mount 51 and the camera body side mount 1 are aligned with the optical axis,
The surfaces of the mounts are brought into contact with each other, the interchangeable lens is rotated around the optical axis of the interchangeable lens, and the claws of the mount on the interchangeable lens side and the claws of the mount on the camera body side are engaged. Camera body side mount 1, interchangeable lens side mount
51 are both made of metal. The electric terminal A is connected to the interchangeable lens side mount 51, and the electric terminal B is connected to the camera body side mount 1, respectively.
Due to the contact between 1 and the interchangeable lens side mount 51, the interchangeable lens and the camera body are electrically connected.

The positioning pin 2 is mounted on the camera body.
1 and is urged by a compression coil spring 13 to protrude in the optical axis direction (arrow X). FIG.
As shown in (B), the positioning pin 2 penetrates the connecting plate 5. Also, prevent the positioning pin 2 from falling off the connecting plate 5 by the urging force of the compression coil spring 13.
9 are arranged.

When the mounting is completed, the positioning pin 2 is
(B) As shown in FIG.
The mounting state of the interchangeable lens is fixed by inserting the interchangeable lens into the lens 51a, and the mounting operation of the interchangeable lens is completed. A shaft 7 is fixed to the operation button 4, and a connecting plate 5 is sandwiched between the collar 7 a of the shaft 7 and the operation button 4 to connect the operation button 4 and the positioning pin 2. The outer periphery of the operation button 4 and the shaft 7 are supported by the camera body fixing portion 8 and formed so as to be able to advance and retreat in the optical axis direction. The compression coil spring 6 constantly urges the operation button 4 in the direction in which the operation button 4 protrudes from the camera body fixing portion 8 in the optical axis direction (arrow X). When detaching the interchangeable lens from the camera body, press the operation button 4 to position the positioning pin via the connecting plate 5 and the stopper 9.
2 moves in conjunction with the operation button 4, and the positioning pin 2 is pulled out of the fitting recess 51a. When the positioning pin 2 is pulled out from the fitting concave portion 51a, the interchangeable lens becomes rotatable around the optical axis, and the interchangeable lens is detached in the reverse procedure of the mounting.

[0007]

[Problems to be Solved by the Invention] The interchangeable lens attaching / detaching device in which both the camera body side mount and the interchangeable lens side mount are made of metal has a problem that it is heavy and difficult to use. When at least one of the two mounts is made of synthetic resin for weight reduction, an interchangeable lens that has been used to obtain electrical coupling between the camera body and the interchangeable lens by contact between the camera body-side mount and the interchangeable lens-side mount made of metal. The detachable device has a problem that electrical connection cannot be obtained as it is.

If at least one of the two mounts, on which at least the fitting recess is provided, is made of synthetic resin, when the interchangeable lens is mounted on the camera body, it collides with a metal positioning pin, and the fitting made of synthetic resin is performed. There is also a problem that the concave portion is worn and deformed. An object of the present invention is to make sure that at least one of the two mounts is made of synthetic resin, electrical connection between the camera body and the interchangeable lens can be reliably performed, and when the interchangeable lens is mounted on the camera body,
An object of the present invention is to provide an attachment / detachment device for a camera body and an interchangeable lens in which a fitting recess does not undergo wear deformation due to a collision between a positioning pin and a fitting recess.

[0009]

[Means for Solving the Problems] To achieve the above object,
In the present invention, replace with the camera body side mount (1)
One of the mounts on the lens side mount (51)
(51), the fitting recesses (51a, 61a) and the fitting recesses;
A conductive portion (51, 61) disposed to be exposed in the portion;
A first electrical terminal (A) electrically connected to the conductive portion;
A first fitting means provided with the other mount (1)
The fitting position at which the fitting recess is fitted and the fitting position are separated from the fitting recess.
Moves in the optical axis direction of the interchangeable lens between the detached position and the detached position
Possible conductive positioning pins (2) and said positioning pins
And a second electrical terminal (B) electrically connected to the
When the positioning pin is at the mating position,
The pin contacts only the conductive part, and the contact causes the first electrical terminal
And configured to obtain electrical contact between the terminal and the second electrical terminal.
Was. In the present invention, the first fitting means (51)
a, 61a, 51, 61, A)
1) is formed of a synthetic resin, and the conductive portion is formed of a metal.
Was. In the present invention, the second fitting means (2,
The mount (1) provided with B) was formed of a synthetic resin. Change
In the present invention, the positioning pin is connected to the fitting recess.
And a first portion (2b) that fits into the fitting recess.
A second portion (2a).
The first cross-sectional area in a direction perpendicular to the optical axis direction is
Smaller than the second cross-sectional area in a direction perpendicular to the optical axis direction.
So that the fitting recesses (51a, 61a)
The cross-sectional area in the direction perpendicular to the optical axis direction is smaller than the second cross-sectional area.
It was formed to be short.

[0010]

[0011]

According to the present invention , the fitting recess is provided on one of the mounts.
A conductive portion exposed and disposed in the fitting recess;
A first electric terminal electrically connected to the electric part.
(1) a fitting means, and the other mount has the fitting recess
And the disengagement position for disengagement from the engagement recess
Between the optical axis direction of the interchangeable lens and
A positioning pin and electrically connected to the positioning pin
A second electric terminal, wherein the positioning pin is located at a fitting position.
The first electrical terminal and the second electrical terminal
The camera body is replaced
An electrical connection with the lens can be obtained. Also positioning
The pin is configured to contact only the conductive part,
Even if the fly mount is made of non-metallic material,
Female pin contacts the resin part of the mount,
There is no risk of wear. In the present invention, the first
A mount provided with fitting means is formed of synthetic resin, and
Since the electrical part is made of metal, it is possible to reduce the weight of the mount
In both cases, when attaching the camera body and the interchangeable lens,
Conductive parts may wear out due to friction with the positioning pins.
There is no. In the present invention, the second fitting means is
The mounted mount is made of synthetic resin,
Can be quantified. Further, in the present invention, the positioning pin
Has a step (step) in the middle, so the position
When the pin is in the mating position, the step of this pin is required.
Of course, it comes into contact with conductive parts,
Obtaining reliable electrical connection between the body and the interchangeable lens
it can.

[0012]

[0013]

[0014]

FIG. 1 is a diagram showing a first embodiment of a device for attaching and detaching a camera body and an interchangeable lens according to the present invention. The interchangeable lens according to the present embodiment is <br/> also been used conventionally. FIG. 1A is a front view of the periphery of a fitting concave portion 51a provided in the interchangeable lens side mount 51 as viewed from the front.
FIG. 1 (B) shows that the positioning pin 2 made of metal has a fitting recess 51.
FIG. 3 is a cross-sectional view of the positioning pin 2 cut in the longitudinal direction when the positioning pin 2 is fitted (when the positioning pin 2 is at the fitting position). The shape of the fitting concave portion 51a is a groove shape in this embodiment, but may be a hole shape. The same components as those in FIG. 3 are denoted by the same reference numerals.
1 will be described below, but the description of the parts already described in FIG. 3 will be omitted.

The camera body side mount 1 is formed of a synthetic resin, and the interchangeable lens side mount 51 is formed of a metal. Electric terminal A on interchangeable lens mount 51
However, an electric terminal B is connected to the positioning pin 2, and an electric circuit (not shown) in the interchangeable lens 52 and an electric circuit (not shown) in the camera body (not shown) An electrical connection has been obtained with the electrical circuit. The electric terminal A connected to the interchangeable lens side mount 51 is connected to a lens body circuit (not shown) in the interchangeable lens.

When the mounting of the interchangeable lens on the camera body is completed, the positioning pin 2 is fitted into the fitting concave portion 51a of the mount 51 on the interchangeable lens side as shown in FIG. And fix the interchangeable lens. The diameter of the part 2a of the positioning pin 2 that fits into the fitting hole 1a of the camera body side mount 1 is
Tip of positioning pin 2 fitted into fitting recess 51a of 51
It is larger than the diameter of 2b and larger than the diameter of the fitting recess. Therefore, the positioning pin 2 has a shape having a step in the middle. The diameter of the tip 2b of the positioning pin 2 is the same as the diameter of the conventional positioning pin. The positioning pin 2 is constantly urged by a compression coil spring 13 so as to protrude in the optical axis direction (arrow X).

When the positioning pin 2 is fitted into the fitting recess 51a (when the positioning pin 2 is at the fitting position) due to the shape of the positioning pin 2 as described above, the stepped portion of the positioning pin 2 is mounted on the interchangeable lens side mount. Touch 51. As a result, reliable electric connection between the interchangeable lens and the camera body can be obtained. As described above, the attachment / detachment device for the camera and the interchangeable lens using the present invention can be used for a conventional interchangeable lens since the diameter of the tip 2b of the positioning pin 2 is equal to the diameter of the conventional positioning pin.

FIG. 2 is a view showing a second embodiment of the interchangeable lens attaching / detaching apparatus according to the present invention. FIG. 2A is a front view of the periphery of a fitting member 61 provided on the interchangeable lens-side mount 51 as viewed from the front, and FIG. FIG. 6 is a cross-sectional view of the positioning pin 2 cut in the longitudinal direction when the positioning pin 2 is fitted into the mating recess 61a.

In the second embodiment, the camera body side mount 1
And the interchangeable lens side mount 51 are formed of synthetic resin. The size and shape of the positioning pin 2 are the same as those of the first embodiment. The fitting member 61 is formed of metal and is embedded in the interchangeable lens-side mount 51 made of a synthetic resin.
The electric terminal A connected to the fitting member 61 is connected to a lens body circuit (not shown) in the interchangeable lens.

As in the first embodiment, when the distal end portion 2b of the positioning pin 2 is fitted into the fitting recess 61a, the stepped portion of the positioning pin 2 is moved by the urging force of the compression coil spring 13 into the fitting member 61.
Contact with. By this contact, the electric terminals A and B are connected, so that a reliable electric connection between the camera body and the interchangeable lens can be obtained. Further, since the fitting member 61 is formed of metal, the strength of the fitting concave portion is higher than that of a case where the entire interchangeable lens side mount is formed of synthetic resin. This allows positioning pin 2
The abrasion and deformation of the fitting recess due to the collision of the fitting recess with the fitting recess hardly occur.

[0021]

According to the present invention, the contact between the positioning pin provided on one of the mount on the interchangeable lens side and the mount on the camera body side and the conductive portion provided on the other allows electrical connection between the camera body and the interchangeable lens. Because the bond is made,
It is not necessary to make both the mounts made of metal, and the camera system can be reduced in weight.

According to the present invention, when the fitting recess is provided in the synthetic resin mount, the fitting recess is formed with a metal conductive portion, so that the camera body and the interchangeable lens are provided. At the time of mounting, contact with the positioning pin,
The fitting recess does not wear or deform due to friction. First
According to the embodiment and the second embodiment, since the diameter of the portion 2b of the positioning pin 2 that fits into the fitting recesses 51a and 61a is the same as the diameter of the conventional positioning pin, the positioning pin is When provided on a mount, compatibility is obtained with a conventional camera body, and when the positioning pin is provided on a mount on the camera body side, compatibility is obtained with a conventional interchangeable lens.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment using the present invention, and FIG. 1 (A) is a front view of the periphery of a fitting concave portion 51a provided in an interchangeable lens side mount 51 as viewed from the front; FIG. 1 (B)
Is when the positioning pin 2 is fitted into the fitting recess 51a.
FIG. 3 is a sectional view of a positioning pin 2 cut in a longitudinal direction.

FIG. 2 is a view showing a second embodiment using the present invention, and FIG. 2 (A) is a front view of the periphery of a fitting concave portion 61a provided in the interchangeable lens side mount 51 as viewed from the front; FIG. 2 (B)
Is when the positioning pin 2 is fitted in the fitting recess 61a .
FIG. 3 is a sectional view of a positioning pin 2 cut in a longitudinal direction.

FIG. 3 is a view showing a conventional interchangeable lens attaching / detaching device, and FIG. 3 (A) is a front view of the periphery of a fitting concave portion 51a provided on the interchangeable lens side mount 51 as viewed from the front. FIG. 3B is a cross-sectional view of the positioning pin 2 cut in the longitudinal direction when the positioning pin 2 is fitted into the fitting recess 51a.

[Description of Signs of Main Parts]

1 Camera body side mount, 1a Mating hole, 2 Locating pin, 2a Part to be fitted to camera body side mount,
2b Tip of positioning pin, 4 Operation button 8 Camera body fixing part 51 Interchangeable lens side mount, 51a Fitting concave, 52 Interchangeable lens 61 Fitting member, 61a Fitting concave A electric terminal, B electric terminal

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) G03B 17/14 G02B 7/02 G03B 7/20

Claims (6)

(57) [Scope of request for utility model registration] 1. An apparatus for detachably connecting a camera body side mount and an interchangeable lens side mount to and from a camera body and an interchangeable lens, wherein one of the two mounts has first fitting means, 1
The fitting means of (1) is provided with a fitting recess and exposed in the fitting recess.
And setting the conductive portion, the electrically connected to the conductive portion 1
The other of the two mounts has a second fitting means, and the second
Fitting means is conductive locating pin and movable in an optical axis direction of the interchangeable lens between a disengaged position disengaged from the fitting position and fitting recess to be fitted into the fitting recess, the positioning and a second electrical terminal electrically connected to the pin, wherein when the positioning pin is in said mating position, the positioning pin contacts only the conductive portion, the first electricity by the contact An attachment / detachment device for a camera body and an interchangeable lens, wherein electrical contact between a terminal and the second electric terminal is obtained. 2. A camera body provided on a camera body.
Equipped with an interchangeable lens side mount that can be connected to the side mount,
Removable replacement for the camera body via both mounts
In the lens, one of the mounts has first fitting means,
The fitting means of (1) is provided with a fitting recess and exposed in the fitting recess.
And setting the conductive portion, the electrically connected to the conductive portion 1
The other of the two mounts has a second fitting means, and the second
Fitting means is conductive locating pin and movable in an optical axis direction of the interchangeable lens between a disengaged position disengaged from the fitting position and fitting recess to be fitted into the fitting recess, the positioning and a second electrical terminal electrically connected to the pin, wherein when the positioning pin is in said mating position, the positioning pin contacts only the conductive portion, the first electricity by the contact An interchangeable lens for obtaining electrical contact between a terminal and the second electric terminal. 3. A lens-side mount provided on an interchangeable lens.
The camera body side mount that can be connected to the
Camera body with detachable interchangeable lens via und
, One of the two mounts has first fitting means,
The fitting means of (1) is provided with a fitting recess and exposed in the fitting recess.
And a first conductive portion electrically connected to the conductive portion.
The other of the two mounts has a second fitting means,
The fitting means comprises a fitting position for fitting into the fitting recess and the fitting position.
The distance between the interchangeable lens and the detached position
A conductive positioning pin movable in the direction of the optical axis;
A second electrical terminal electrically connected to the pin.
And, when the positioning pin is in said mating position, the position
The positioning pin contacts only the conductive part, and the contact
Electrical contact between the first electrical terminal and the second electrical terminal
Camera body characterized by obtaining. 4. A mount provided with the first fitting means.
The conductive part is made of synthetic resin, and the conductive part is made of metal.
The attachment / detachment device according to claim 1, or
The interchangeable lens according to claim 2 or the interchangeable lens according to claim 3
Camera body. 5. A mount provided with said second fitting means.
2. The method according to claim 1, wherein the resin is formed of a synthetic resin.
Mounting / removing device, the interchangeable lens according to claim 2, or
A camera body according to claim 3. 6. The positioning pin is fitted in the fitting recess.
A first part that fits in, and a second part that does not fit in the fitting recess.
And a first portion of the first portion in a direction perpendicular to the optical axis direction.
The cross-sectional area is the second portion of the second portion in a direction perpendicular to the optical axis direction.
The fitting recess is formed so as to have a smaller sectional area, and a sectional area of the fitting recess in a direction perpendicular to the optical axis direction is
2. A method according to claim 1, wherein said second sectional area is smaller than said second sectional area.
6. The detachable device according to claim 5,
Interchangeable lens or camera body.