JP3194661B2 - Camera lens mount mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens mount mechanism for a camera, and more particularly, to a lens mount mechanism for a camera in which a camera body and a lens barrel are watertightly connected for waterproofing in an interchangeable lens camera. It is about.

[0002]

2. Description of the Related Art In an interchangeable photographing lens camera in which a replacement photographing lens barrel can be detachably mounted, the camera body and the lens barrel are connected by a lens mount mechanism provided between the camera body and the lens barrel. They are connected and integrated. Conventionally, there are various types of mount mechanisms, and a bayonet mount mechanism is generally used in a current interchangeable lens camera, for example, a single-lens reflex camera. No consideration is given to waterproofing between the photographing lens barrel and the camera body, and when the camera becomes wet due to shooting in the rain, the distance between the camera body and the lens barrel is not considered. water or the like intrudes from the extremely narrow gap, or to generate a mold for precise camera components, or corrode, also has the disadvantage or ruining the film. Therefore, in order to solve such a disadvantage, a lens mount mechanism provided with waterproofness has been conventionally proposed.

For example, a lens mount mechanism of a camera disclosed in Japanese Utility Model Publication No. 61-24983 discloses a member disposed on a mount portion of a camera body when a photographing lens barrel is mounted on the camera body. Is displaced in conjunction with the turning operation of the taking lens barrel, and the displacement in the turning direction is converted into the displacement in the optical axis direction by a screw portion provided on the member, and the side surface of the lens mount mechanism is The annular waterproof packing member provided on the lens barrel is pressed against the peripheral edge of the bottom surface of the lens barrel side mount.

[0004]

However, according to the means disclosed in Japanese Utility Model Publication No. 61-24983, the lens barrel is rotated to mount the taking lens barrel to the camera body. Since the waterproof packing member moves to a position protruding from the mount surface on the camera body side by this rotation operation, the waterproof packing member and the waterproof packing member come into contact with each other from the time when the waterproof packing member comes into contact with the peripheral edge of the bottom surface of the lens barrel side mount. Friction occurs between the lens barrel mount and the periphery of the bottom surface of the mount. That is, during the rotation operation for mounting the photographing lens barrel, it is necessary to press the waterproof packing member against the peripheral edge of the bottom surface of the mount on the lens barrel side with a certain amount of force or more. The turning operation is continued for a predetermined amount even after the frictional force is generated. Therefore, the frictional force increases the rotational load for mounting the taking lens barrel. Further, since the peripheral edge of the bottom surface of the lens barrel mount always slides on the surface of the waterproof packing member, there is a disadvantage in that the durability of the waterproof packing member itself causes a problem.

It is an object of the present invention to slide the surface of the waterproof packing and at least one of the mount on the camera body side or the mount on the lens barrel side during the rotation operation when the lens barrel is mounted. Another object of the present invention is to provide a lens mount mechanism for a camera in which the waterproof packing itself is improved in durability by preventing the waterproof packing from moving and reducing the rotation load at this time.

[0006]

According to the present invention, there is provided a camera lens mount mechanism in which a lens barrel is attached to a camera body.
In detachably mountable turtle <br/> La of the lens mount mechanism by pairs to rotate, also said camera body <br/> properly is provided on at least one mount side of the lens barrel side , the lens barrel to the camera body is pressed against the other mount upon which is mounted a waterproof packing that between both mounted in a watertight state, when the attachment and detachment of the lens barrel, the times
Prior to the moving operation, attach the waterproof packing to the other mounting
Retreat to a position where it cannot come into contact with the
At the end, the waterproof packing abuts on the other mount
And a driving mechanism for driving to a possible position . Also, the lens mount mechanism of the camera according to the present invention allows the lens barrel to be detachably attached to the camera body.
In a possible camera lens mount mechanism, the turtle
At least one of the mouse on the camera body side or the lens barrel side
The lens barrel is attached to the camera body.
Is pressed against the other mount when
A waterproof packing that state, setting one of the mount side the
Compared to the waterproof packing,
The engagement pin protruding with respect to the waterproof packing and the
Hold the engagement pin and move the optical axis
A support member that can advance and retreat to and from the other
Biasing means for biasing toward the und side;
When the lens barrel is mounted, the engagement pin is
The waterproof packing is pressed by the und surface.
The optical axis to a position where the
Characterized in that it can be retracted in the direction
Comprising an operating member for displacing the optical axis direction, the lens
When removing the lens barrel from the camera body,
By pressing the waterproof packing, the other
Can be retracted in the optical axis direction to a position where it cannot contact the mount
It is characterized by the following.

[0007]

Against the camera body mount provided to the work for the camera body, when removably to connect the lens barrel side mount provided on the photographing lens barrel by relatively rotating the photographic lens barrel Then, the waterproof packing provided on one of the mounts is pressed against the other mount surface to make the space between the two mounts watertight. When attaching and detaching this lens barrel,
Prior to the rotation operation, the waterproof packing is
Retract to a position where it cannot touch the mount, and rotate
At the end of the operation, attach the waterproof packing to the other mount
Drive to a position where it can abut .

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. FIG. 1 is a view showing a camera body of an embodiment to which a lens mount mechanism of the camera of the present invention is applied, and FIG.
FIG. 4 is an enlarged exploded perspective view of a main part of a lens mount on the camera body side. The configuration of this embodiment will be described below with reference to FIGS.

As shown in FIG. 1, a ring-shaped camera body side mount 12 for detachably mounting a replacement photographing lens barrel on a mount mount 17 formed at the center of the front surface of the camera body 1. Is screwed with a mounting screw 12c to form a photographic lens mounting portion.

As shown in FIG. 2, the camera body side mount 12 is made of, for example, brass or the like, and its surface is subjected to a surface treatment such as nickel plating, or an annular shape made of stainless steel or the like. And a through hole 12b is formed at three equally spaced positions. The mount mount 17 is provided with a screw hole 17a at a position facing the through hole 12b. The camera side mount 12 inserts a mounting screw 12c through the through hole 12b to mount the mount. It is fixed by being screwed into the screw hole 17a of the base 17. The front edge of the through hole 12b provided in the camera body side mount 12 is counterbored, so that the camera body side mount 1
2 is fixed to the mount base 17, and each screw 12
The dish head c does not protrude from the front surface of the camera body side mount 12.

A bayonet claw (not shown) is provided on the inner peripheral surface of the camera body side mount 12 at approximately three equally spaced positions, and on the rear side of the camera body side mount 12. A partial arc-shaped mount leaf spring (not shown) is provided at a position corresponding to the bayonet claw. Then, the bayonet claw and the bayonet claw provided on the photographic lens barrel side engage with each other, so that the photographic lens barrel and the camera body 1 are connected. When the photographic lens barrel is mounted on the camera body 1, the partial arc-shaped mount leaf spring contacts the inner end surface of the bayonet claw on the photographic lens barrel side, and the photographic lens barrel is moved to the camera. The main body 1 is pressed and held with strong force. The mount section of the camera body 1 of this embodiment is thus constituted by a normal bayonet mount mechanism.

The center portion of the mount mount 17 is a part of a front plate constituting a mirror box or the like disposed inside the camera body 1 (see FIG. 1), and is located at the center of the front surface of the camera body 1. It is formed to protrude slightly at the position. The mount mount 17 has an annular shape, and a partially arc-shaped convex portion 17f projects forward of the camera body 1 at approximately three equally spaced positions. This convex part 1
As described above, the screw hole 17a corresponding to the through hole 12b of the camera body side mount 12 is provided in the middle of the front side of 7f.
Are screwed into the screw holes 17a through the through holes 12b by the mounting screws 12c, respectively.
The camera body side mount 12 is screwed.

A ring-shaped support plate 14 made of, for example, a thin plate of stainless steel or the like is fitted on the outer peripheral portion of the mount mount 17.
A partially arc-shaped concave portion 14d is provided at approximately three equal positions. The recess 14 d is provided in the mount mount 17.
At a position corresponding to the convex portion 17f, and is fixed by engaging with each other, so that the support plate 14 is prevented from rotating.

The camera body 1 on the front side of the support plate 14
A mount pin 14a is fixedly implanted in the vicinity of the operation button 2 (see FIG. 1) disposed on the front of the camera. The mount pin 14a is inserted through a through hole 12a provided in the camera body side mount 12, and is mounted on the camera body side mount 1.
The camera body 1 is disposed so as to protrude toward the front of the two surfaces, and is provided on the outer peripheral side of the support plate 14 on which the mount pins 14a are fixedly implanted, from a ring portion on the front surface of the support plate 14. A step portion is provided toward the back side, and a semicircular substrate portion 14b is provided in the step portion. The above-mentioned operation buttons 2 are arranged on the camera body 1 located in front of the board portion 14b.

On the front side of the outer peripheral edge of the ring portion of the support plate 14, a ring-shaped elastic member having a flange portion over the entire peripheral surface, for example, a synthetic rubber such as natural rubber, fluorine rubber, silicon rubber or the like is used. A waterproof packing 13 made of rubber is fixed on the flange surface side with an adhesive or the like. When the photographing lens barrel (not shown) is mounted on the camera body 1, the waterproof packing 13 is pressed against a lens-side mounting surface fixed to the rear end of the photographing lens barrel, and The body-side mount 12 and the lens barrel-side mount are placed in a watertight state, and are arranged for waterproofing between the mounts.

Further, compression springs 18a, 18b, 18c are provided between the support plate 14 and the mount mount 17, and the support plate 14 is moved by each of the compression springs 18a, 18b, 18c. It is urged toward the front of the camera body 1 (toward the lens barrel to be mounted).
Here, the mount pins 14a fixedly implanted on the support plate 14 are connected to the compression springs 18a, 1 as described above.
The biasing support plate 14 of 8b, 18c protrudes forward of the camera body 1 through a through hole 12a on the camera body side mount 12 surface.

Further, the support plate 14 is retracted toward the rear of the camera body 1 by pressing the operation button 2 provided on the front surface of the camera body 1. Therefore, the mount pin 14a and the waterproof packing 13 provided on the support plate 14 are both retracted to the rear of the camera body 1, and when the operation button 2 is pressed, the above-mentioned operation button 2 is pressed. Support plate 14
Is pressed, and the support plate 14 moves in the optical axis direction, that is, toward the rear of the camera body 1.

At this time, the support plate 14 can be smoothly translated in the optical axis direction only by pressing the substrate portion 14b provided at one end of the ring portion of the support plate 14 on the outer peripheral side. Can not. Therefore, in order to smoothly translate the support plate 14 in the optical axis direction only by pressing the operation button 2, one end near the substrate portion 14 b and the back surface of the support plate 14 located on the opposite side. Side 14c
Pins 17 b, 17 c, and 17 disposed outwardly on the outer periphery of the mount mount 17 between the other end in the vicinity.
They are connected by flexible wires 19a and 19b via d and 17e (see FIG. 5).

That is, as shown in FIGS. 6 and 7, one end of each of the wires 19a and 19b is connected to the substrate portion 14b of the support plate 14.
, Respectively, while the wire 19
The other ends of the pins a and b are provided on the outer periphery of the mount base 17 outwardly.
The support plate 14 is fixed near the back surface 14c of the support plate 14 located on the opposite side of the substrate portion 14b via each of 17d and 17e.

In FIG. 2, one end of the wire 19a is connected to the pins 17b and 17c.
One end of the wire 19b is hung above the mount mounting base 17 with respect to the pins 17d and 17e, respectively. The pins 17b,
17c, 17d, and 17e are arranged as shown in FIGS.

FIGS. 3 and 4 show the operation when the photographing lens barrel is mounted on the camera body to which the lens mount mechanism of the above-described embodiment of the camera is applied.
This will be described below.

FIGS. 3 and 4 are enlarged longitudinal sectional views of the essential parts of the mount on the lens barrel side and the mount on the camera body side of this embodiment. FIG. 3 shows the lens barrel mounted on the camera body. FIG. 4 shows a state in which the lens barrel is mounted on the camera body.

First, the taking lens barrel 22 is connected to the camera body 1.
In order to mount the lens mount on the camera body, the lens barrel side mount 21 provided at the rear end of the taking lens barrel 22 is brought into contact with the camera body side mount 12. At this time, the mounting pins 14
a is pressed on the surface of the lens barrel side mount 21, and on the rear side of the camera body 1 from the surface of the camera body side mount 12,
It is retracted together with the support plate 14 and the waterproof packing 13.

Then, the photographing lens barrel 22 is rotated about the optical axis. Then, the lens barrel side mount 21
The camera body side mount 12 is connected to the camera body side mount 12 by the bayonet mount mechanism described above, and the photographing lens barrel 22 is fixed to the camera body 1.

At this time, the lens barrel 22 is attached to the camera body 1.
In the state before mounting, as shown in FIG. 3, the distal end of the mount pin 14 a is protruded from the surface of the camera body side mount 12 at a position higher than the ring-shaped distal end of the waterproof packing 13. Since the mounting pins 14a are disposed, the mount pins 14a are pressed toward the rear side of the camera body 1 by the lens barrel mount 21 so that the support plate 1
4 is retracted together with the mount pin 14a, and the support plate 1
The waterproof packing 13 adhered to the outer periphery of 4 also has
It is retracted behind the camera body side mount 12 surface.

Therefore, during the rotation operation about the optical axis when the lens barrel side mount 21 is mounted on the camera body side mount 12, the waterproof packing 13 comes into contact with the surface of the lens barrel side mount 21. There is no sliding between the waterproof packing 13 and the lens barrel side mount 21 surface.

As shown in FIG. 4, on the surface of the lens barrel side mount 21, at a position where the lens barrel 22 is fixed to the camera main body 1, the mount is located at a position corresponding to the mount pin 14a. A hole 21a into which the pin 14a is inserted is provided. When the lens barrel 22 is fixed to the camera body 1, the compression springs 18a, 18b, 1
8c, the support plate 14 and the mount pins 14a are moved to the holes 21 on the surface of the lens barrel side mount 21.
a. Therefore, the end of the waterproof packing 13 is placed on the surface of the lens barrel side mount 21 which is in contact with the camera body side mount 12, and the compression springs 18a, 18b, 18c
The waterproof packing 13 itself is elastically deformed by the urging force of
And the camera body side mount 12 are connected in a watertight manner. Further, at this time, the outer peripheral edge of the flange portion of the waterproof packing 13 is also water-tightly coupled to the exterior part 20 of the camera. A waterproof structure is formed between the camera body and the exterior part 20 of the camera body.

Further, when the photographic lens barrel 22 is mounted on the camera body 1, the mount pin 14a also serves as a locking pin for holding the photographic lens barrel 22 so as not to rotate.

Next, the taking lens barrel 22 is connected to the camera body 1.
When the operation button 2 is depressed, the substrate portion 14b of the stepped portion of the support plate 14 is pressed, and the support plate 14 moves rearward in the optical axis direction. The pin 14a is detached from the hole 21a on the surface of the lens barrel side mount 21, and is retracted to the rear side of the camera body 1 together with the support plate 14 and the waterproof packing 13.

That is, as shown in FIG.
a, 18b (18c), the lens barrel side (FIG. 6,
7, the support plate 14 urged downward (see FIG. 7) moves the substrate portion 14b of the step portion of the support plate 14 toward the mount mount 17 as shown in FIG. A
Direction), the wires 19a (19b) adhered to the support plate 14 are pulled in the directions of the arrows x, y, and z at the respective positions shown in FIG. 14 opposite each other
At b and 14c, the support plate 14 is pressed in the direction of the arrow A, whereby the support plate 14 is translated in the optical axis direction. Since the wire 19b performs the same operation at the same time, the support plate 14 is moved in the optical axis direction only by pressing the substrate portion 14b (operation button 2) of the step portion of the support plate 14. The translation can be performed smoothly. Here, the pins 17b, 17c, 17d, 17e are connected to the mount base 1
Although the members are fixed to the supporting member 7, the parallel movement of the support plate 14 can be performed more smoothly by using rollers and the like rotatably supported on the mount mount 17 for these members. it can.

As described above, when the operation button 2 is pressed, the support plate 14 moves rearward in the optical axis direction, so that the mounting pin 14a and the hole 14a on the surface of the lens barrel side mount 21 are separated. The waterproof packing 1 which has been detached and further pressed against the surface of the mount 21 on the lens barrel side.
3 is also retracted together with the support plate 14. Therefore, by rotating the lens barrel 22 in the direction opposite to the mounting direction, the waterproof packing 13 does not come into contact with the lens barrel side mount 21 surface and also slides on the mount 21 surface. In addition, the lens barrel 22 can be removed from the camera body 1 by a light rotation operation.

In the above embodiment, the waterproof packing is provided on the camera body side mount. On the contrary, for example, the waterproof packing is provided on the lens barrel side mount. By doing so, exactly the same effect can be obtained.

[0033]

As described above, according to the present invention, the photographing lens barrel and the mount portion of the camera body can be connected in a watertight manner.
Since the waterproof packing provided on one mount does not come into contact with the contact surface between the other mount surface and does not slide, the rotational load when attaching and detaching the lens barrel is greatly reduced. In addition, it is possible to provide a camera lens mount mechanism that contributes to improving the durability of the waterproof packing.

[Brief description of the drawings]

FIG. 1 is a plan view showing a camera body of an embodiment to which a lens mount mechanism of a camera according to the present invention is applied.

FIG. 2 is an enlarged exploded perspective view of a main part of the camera body side mount section of FIG. 1;

FIG. 3 is an enlarged vertical sectional view of a main part of the embodiment, showing a state where a lens barrel side mount is not mounted on a camera body side mount;

FIG. 4 is an enlarged vertical sectional view of a main part of the embodiment, showing a state where a lens barrel side mount is mounted on a camera body side mount;

5A and 5B are plan views showing the mount mount in FIG. 2, wherein FIG. 5A shows the positions of pins arranged on the mount support, and FIG. 5B shows AA in FIG. The arrow view from the direction.

FIG. 6 is an enlarged cross-sectional view of a main part of the support plate in FIG. 2, showing a state in which the support plate is urged by a compression spring.

FIG. 7 is an enlarged cross-sectional view of a main part of the support plate in FIG. 2, showing a state in which a substrate (operation button) is pressed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Camera body 2 ... Operation button 12 ... Camera body side mount 12a ... Through hole 12b ... Through hole 13 ... Waterproof packing 14 ... Support plate 14a ... Mounting pin 14b ...... Board part of stepped part 17 ...... Mount mount 17a ...... Screw holes 17b, 17c, 17d, 17e ...... Pins 18a, 18b, 18c ...... Compression springs 19a, 19b ...... Wire 20 ... … Exterior part 21 …… Lens barrel side mount 22 …… Lens barrel

Claims (3)

(57) [Claims] 1. A lens barrel relative to a camera body
In detachably lens mount mechanism can be mounted camera by rotating, the camera body also properly is provided on at least one mount side of the lens barrel side, when the lens barrel is attached to the camera body A waterproof packing which is pressed against the other mount to make a watertight state between the two mounts; and
The waterproof packing cannot come into contact with the other mount
Position, and at the end of the pivoting operation, the waterproof
Drive the packing until it can contact the other mount.
A lens drive mechanism for a camera, comprising: a driving mechanism that moves. 2. A lens barrel is detachably attached to a camera body.
In a lens mount mechanism of a camera mountable on a camera , at least one of the camera body side and the lens barrel side is provided.
Lens barrel on the camera body.
When mounted, it is pressed against the other mount, and both mounts
The waterproof packing that makes the space between them waterproof and the waterproof packing provided on one of the mounts
In addition , holding the engagement pin protruding from the one mounting surface , the waterproof packing and the engagement pin,
A support member that can advance and retreat in the optical axis direction with respect to the mount, and biases the support member toward the other mount side
Biasing means, and when attaching the lens barrel, the engaging pin
Is pressed by the other mounting surface.
The waterproof packing may come into contact with the other mount.
Feature that can be retracted in the optical axis direction to a position
Mera's lens mount mechanism . 3. In order to displace said support member in the optical axis direction.
Operation member, when removing the lens barrel from the camera body,
By pressing the operating member, the waterproof packing is
In the optical axis direction to a position where it cannot contact the other mount
3. The camera according to claim 2, wherein the camera can be evacuated.
Lens mount Organization.