JPS61102638A - Mounting and demounting mechanism for interchangeable lens of video camera - Google Patents

Abstract

PURPOSE:To mount a lens easily and securely and to facilitate index setting during lens mounting by providing a reset lever which moves a pin energized by a spring back from a mount surface to a camera side, and arranging a mount spring which presses the flange part of a bayonet against the side wall of the groove part of a friction ring at a lens side. CONSTITUTION:When the lens is mounted on the camera, the lens is pressed and rotated clockwise in while recess and projection parts of the bayonet 6 and mount 5 are aligned with each other, and then the pin 7 is pressed by the bayonet 6 to move back to the position where it does not project, so that the bayonet 6 rotates together with a lens-side cover 10, i.e. lens with the frictional force of the friction ring 11 energized by the mount spring 12. When a lock groove 6a faces the pin 7, the pin 7 engages the lock groove 6a. When the lens is rotated counterclockwise, only the lens rotates and its mounting is finished. When the lens is demounted, the reset lever 8 is rotated as shown by an arrow, and then the pin 7 is disengaged from the lock groove 6a to rotate the lens counterclockwise, so that the lens is demounted while the recess and projection parts of the mount 5 and bayonet 6 are aligned with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanism for attaching and detaching an interchangeable lens in a video camera with interchangeable lenses.

Conventional techniques and their problems 11 Conventionally, various mechanisms for attaching and detaching interchangeable lenses in video cameras have been adopted, such as the so-called screw mount type and bayonet mount type. With the addition of functions such as electric zoom, many cameras have a non-circular mounting surface, and there are also camera grips, viewfinders, etc. around the lens.
Due to the fact that a microphone and the like are disposed, there is a problem in that it becomes difficult to rotate the lens when attaching and detaching the lens due to the current trend of miniaturization of video cameras.

In addition, when a lens is attached, many cameras require an electrical connection between the video camera and the lens in order to supply power from the video camera to the autofocus mechanism, electric zoom mechanism, etc. mentioned above, and to transmit control signals. When attempting to make such an electrical connection without using a connection cord, it is also troublesome to align the indicators to engage the connectors provided on the video camera and the lens when the lens is attached.

Purpose The present invention has been made in view of the above points, and provides a video camera that allows the lens to be easily and reliably attached and detached even in a limited space, and that reduces the troublesomeness of adjusting the index when the lens is attached. The purpose of the present invention is to provide a mechanism for attaching and detaching an interchangeable lens.

Return to Nu 11 order.

Hereinafter, the present invention will be explained in detail based on the drawings.

Fig. 1 is a side sectional view showing the mounting state of an embodiment of the present invention, Fig. 2 is a front view of the video camera side mount, Fig. 3 is a front view of the lens side bayonet, and Fig. 4 is the attachment/detachment mechanism of the present invention. 5 is a front view showing an example of a video camera equipped with
FIG. 2 is a side view of the illustrated video camera.

First, as an example of a video camera equipped with the attachment/detachment mechanism of the present invention, as shown in FIGS. 4 and 5, the lens 2 attached to the camera 1 has an autofocus mechanism.

It has an electric zoom mechanism, etc., the mounting surface to the camera 1 is not circular, and there is also a camera grip 3 around the lens 2. It is assumed that a finder 4 or the like is arranged, and the rotational operation of the lens 2 is restricted when the lens 2 is attached or detached.

Next, an embodiment of the attachment/detachment mechanism of the present invention will be described.

1 to 3, the camera-side mount 5 is provided with a pin 7 that engages with a lock groove 6a provided in the lens-side bayonet 6, and the tip of the pin 7 protrudes from the mount surface. It is urged by a spring (not shown) in the direction shown in FIG. One end of the release lever 8 projects to the outside of the camera side cover 9 through a hole 9a provided in the camera side cover 9, and the pin 7 is fixed to the other end. A friction ring 11 is interposed between the bayonet 6 and the lens side cover 10, and a groove 11a is formed over the inner peripheral surface and is fixed to the lens side cover 10. A mount spring 12 is disposed in the gap of the flange portion 6b of the bayonet 6, and presses the flange portion 6b toward one side wall of the groove portion 11a to prevent friction when the bayonet 6 rotates with respect to the lens side cover'10. It gives power.

Effect of the embodiment The operation of the embodiment of the present invention having the above configuration will be explained.

When attaching lens 2 to camera 1, first attach bayonet 6.
Align the concave and convex portions of the mount 5 with the mount 5, push them in, and rotate them clockwise when viewed from the lens 2 side.

At this time, the pin 7 is pushed by the bayonet 6, as shown in the figure.

Since the bayonet 6 is retracted to a position where it does not protrude from the mount 5 against the biasing force of the spring, the bayonet 6 is integrated with the lens side cover IO1, that is, the lens 2, due to the frictional force with the friction ring 11 provided by the mount spring 12. Rotate to .

When the lock groove 6a provided in the bayonet 6 faces the pin 7, the pin 7 projects from the mount 5 and engages with the lock groove 6a by the biasing force of a spring (not shown).

The positional relationship between the bayonet 6 and lens 2 during this time is as follows:
With the lock groove 6a in the position shown in Figure 3, Figure 4,
The bayonet 6 is placed directly in front of the lens 2 in the correct position as shown in Figure 5.
is installed.

Therefore, when the pin 7 is engaged with the lock groove 6a and the connection between the mount 5 and the bayonet 6 is completed, the lens 2 is attached at an angle with respect to the camera l, so the lens 2 is 4 and 5 by rotating it counterclockwise.
It will be returned to the position shown. At this time, bayonet 6
Since the lock groove 6a and the pin 7 are engaged, the lens 2, that is, the lens-side cover 10 and the friction ring 11 do not rotate together, and are rotated by a force greater than the friction force applied by the mount spring 12. When the lens 2 is rotated, only the lens 2 rotates and becomes the state shown in FIGS. 4 and 5, completing the installation.

Also, when removing lens 2 from camera 1.

After rotating the lens 2 clockwise in FIG. 4, the release lever 8 partially protruding from the camera side cover 9 is moved in the direction of the arrow in FIG. 1 to disengage the lock groove 6a and the pin 7. By removing it and rotating the lens 2 again in the counterclockwise direction in Fig. 4, the bayonet 6 will also rotate together with the lens 2, and the corresponding concave and convex portions of the mount 5 and the bayonet 6 will match, so from this state If the lens 2 is moved to the right in FIG. 5, the lens 2 will be removed from the camera 1, and the removal will be completed.

Although not shown, there is a lock groove 6 at the position shown in the third figure.
In the initial position where the bayonet 6 is attached directly in front of the lens 2 in the normal position as shown in Figs. etc., when rotating only the lens 2 in the clockwise direction in Fig. 4 to remove the lens 2, the lens 2 can always be rotated in a fixed position, and the lens 2 can be repeatedly attached and detached. However, when mounting the camera 1, the lens 2 only needs to be oriented in the same direction as when the mounting is completed, so that the hassle of index alignment etc. can be reduced.

Furthermore, if a stopper or the like is provided to prevent the lens 2 from rotating counterclockwise with respect to the bayonet 6 at the position when the lens 2 is completely attached, the lens 2 can be prevented from inadvertently rotating after the attachment is completed. can be prevented.

As described above, according to the present invention, it is possible to easily and reliably attach and detach a lens even in a limited space, and the troublesomeness of adjusting the index when attaching a lens can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing the mounted state of an embodiment of the present invention, FIG. 2 is a front view of the camera-side mount viewed from the lens side, and FIG. 3 is a front view of the lens-side bayonet viewed from the camera side.
FIG. 4 is a front view showing an example of a video camera equipped with a detachable mechanism according to the present invention, and FIG. 5 is a side view of the video camera shown in FIG. 1... Camera 2... Lens 5... Mount 6... Bayonet 7... Pin
;8...Release lever 9
...Camera side cover 110...
Lens side cover 11...Friction ring 12...Mount spring 3rd hole 57 [1

Claims (1)

[Claims] The camera side includes a mount fixed to the camera side cover;
The lens includes a pin biased by a spring in a direction protruding from the mount surface of the mount, and a release lever that retracts the pin from the mount surface against the biasing force of the spring; the lens side engages with the mount. a locking groove provided on the bayonet and capable of engaging with the pin; a friction ring fixed to a lens side cover and having a groove portion extending over the inner peripheral surface thereof with a flange portion of the bayonet interposed therebetween; An attachment/detachment mechanism for an interchangeable lens in a video camera, comprising a mount spring disposed in a gap between a side wall of a groove and the flange and presses the flange against the side wall of the groove to apply a frictional force.