JPH0136165Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is an attachment/detachment mechanism for an interchangeable lens for an autofocus camera, and more specifically, an attachment/detachment mechanism for an interchangeable lens for an autofocus camera. To provide an attachment/detachment mechanism for an interchangeable lens that can be accurately positioned and locked on a mount surface when attached to the autofocus camera, and can also be used to attach and detach an interchangeable lens other than an autofocus camera to the autofocus camera.

The conventional attachment/detachment mechanism for interchangeable lenses is locked by locking the key at the tip of a lock lever provided on the camera body into a coupling groove provided in the bayonet of the interchangeable lens, and can be operated from outside the camera body. The lock is released by operating a lock lever using a lock release button to release the lock between the key portion and the coupling groove.

Next, the autofocus camera proposed by the present applicant will be briefly described, and problems encountered when using the above-mentioned interchangeable lens attachment/detachment mechanism will be discussed.

The lens drive mechanism of an autofocus camera that the applicant has already proposed uses a coupler on the body side, which rotates around an axis parallel to the camera's optical axis and is always biased in the protruding direction, when an interchangeable lens is attached. ,
It is configured to be coupled to the coupler of the interchangeable lens and transmitted to the lens barrel to move the lens forward or backward.

This autofocus camera transmits the power for driving the lens through the mount surface, so when the bayonet of the interchangeable lens is positioned and locked, the couplers on the body and lens sides of the mount surface are There was a problem that positioning for joining could not be done accurately.

In addition, when it comes to autofocus cameras, there is a demand for the use of not only interchangeable lenses specifically designed for autofocus, but also conventional interchangeable lenses, and a mechanism for easily attaching and detaching both interchangeable lenses was required. .

The purpose of this invention is to enable accurate positioning for coupling the autofocus driving force transmission mechanism when an autofocus interchangeable lens is attached to an autofocus camera; To provide a mechanism for attaching and detaching an interchangeable lens for an autofocus camera, which allows the lens to be attached and detached.

In order to achieve the above object, the attachment/detachment mechanism for an interchangeable lens for an autofocus camera according to the present invention has a body side that rotates about an axis parallel to the optical axis and is biased in the direction of protruding from the mount surface and joining. An autofocus camera that uses a coupler to transmit the driving force for moving the lens forward and backward, the mount having a coupling hole for a coupler on the lens side that engages with the coupler on the body side. In an attachment/detachment mechanism for an interchangeable lens for an autofocus camera that can be attached to any non-autofocus interchangeable lens having a coupling groove provided therein, the body-side coupler is pivotally supported inside and protrudes from the mount surface. a coupler receiver whose tip engages with the inner periphery of the coupling hole of the autofocus interchangeable lens; a retraction lever that moves the coupler receiver in the retracting direction; It consists of a lens lock lever that engages with a coupling groove of an interchangeable lens that is not for focusing, and a lens lock release button that can be operated from outside the camera body and moves the retraction lever and the lens lock lever to the release side. When an interchangeable lens for autofocus is attached, the coupler receiving tip is inserted into the coupling hole of the mount and locked, and when an interchangeable lens for non-autofocus is attached, the key part of the lens lock lever is locked. The lens is locked by engaging with the coupling groove of the bayonet, and any of the interchangeable lenses can be unlocked by the lens lock release button.

According to the above structure, the object of the present invention can be completely achieved.

Hereinafter, the present invention will be explained in more detail with reference to the drawings and the like.

Fig. 1 is an external perspective view showing a camera used in the attaching/detaching mechanism for an interchangeable lens for an autofocus camera according to the present invention, and Figs. 2 to 4 are examples of the attaching/detaching mechanism for an interchangeable lens for an autofocus camera according to the present invention. FIG. 2 is a perspective view as seen diagonally from the rear, FIG. 3 is a side view, and FIG. 4 is a rear view.

Body mount 1 and base plate 1 shown in Figure 2
2 is fixed to a mount base (not shown). As shown in FIG. 3, a coupler receiver 8 is inserted into the body mount 1, and is always urged in the projecting direction (rightward in FIG. 3) by a first spring 9. A coupler 11 is rotatably inserted into the coupler receiver 8, and the coupler 11 is similarly urged in the projecting direction by a second spring 13 whose rear end is regulated by a collar 14. A concave portion 11a is provided at the tip of the coupler 11, and can be coupled to a convex portion 16a of a lens-side coupler 16 provided on the lens mount 15. A gear 17 connected to a gear train for driving the lens is fixed to the coupler 16 with a screw. A gear 10 connected to a drive source on the camera side is fixed to the rear end of the coupler 11 with a screw.

The first lever 5 is pivotally supported on the base plate 12 by a shaft 5a, and consists of an arm portion 5b that abuts the second lever 6 and a tongue portion 5c that abuts the lock lever 3. As shown in FIG. 4, the lock lever 3 is pivotally supported by a shaft 3a on a mount base (not shown), and a key portion 3b at the tip of the lock lever 3 can be engaged with a lock groove 4a of a lens bayonet 4. The tip of the lens lock release button 2 is in contact with the tongue-shaped portion 5c of the first lever 5.

The second lever 6 is connected to the main plate 12 as shown in FIG.
is pivotally supported by a shaft 6a on a bent portion 12a of the
The fan-shaped protruding portion is provided with a surface 6b that contacts the first lever 5 and a surface 6c that contacts the retraction lever 7. The retraction lever 7 is pivotally supported on the base plate 12 by shafts 7a, 7a, as shown in FIG. 8a so as to be engageable.

Next, with reference to FIGS. 7 and 8, a description will be given of the attachment/detachment operation of the attachment/detachment mechanism for the interchangeable lens for an autofocus camera according to the present invention.

When attaching the lens, use body mount 2.
When the lens mount 15 is pressed against the lens mount 15, the tips of the coupler 11 and the coupler receiver 8 are pulled into the mount surface against the first spring 9 and the second spring 13, respectively, as shown in FIG.

In a lens equipped with an autofocus mechanism, when the lens is rotated in the mounting direction, the coupler receiver 8 jumps into the coupling hole 15a of the lens mount and first locks the lens, as shown in FIG. In this case, the lock groove 4a of the lens bayonet 4 and the key part 3 of the lock lever 3 shown in FIG.
Either allow some play in the engagement of a, or intentionally shift the key part 3a and the lock groove 4a, so that the lens can be positioned by the coupler receiver 8 and the coupling hole 15a of the lens mount 15. be. Next, when the concave portion 11a of the coupler 11 on the body side is rotated to the pivot position shown in FIG. 3, which coincides with the convex portion 16a of the coupler 16 on the lens side, the concave portion 11a and the convex portion 16a are combined. The driving force from the camera side can be transmitted to the lens side.

When mounting a conventional lens, even if the lens is rotated from the state shown in FIG. 7, there is no coupling hole 15a, so the state of the mounting surface is substantially the same as the state shown in FIG. 7. Therefore, the lens is locked by the key portion 3a of the lock lever 3 and the lock groove 4a of the lens bayonet 4.

To remove the lens, push the lens lock release button 2 to the left in Fig. 4, and then release the first lever 5.
rotates counterclockwise around the shaft 5a, and the tongue-shaped portion 5c of the first lever 5 is rotated counterclockwise around the shaft 5a, and the tongue-shaped portion 5c of the first lever 5 is rotated counterclockwise around the shaft 5a.
Press. Then, the lock lever 3 rotates clockwise about the shaft 3a, and the key portion 3b at the tip of the lock lever 3 is disengaged from the lock groove 4a of the lens bayonet 4.

At this time, the arm portion 5b of the first lever 5 moves to the left in FIG. 5, so the second lever 6 moves toward the shaft 6a.
Rotate clockwise around the center, and then rotate the retraction lever 7 counterclockwise. The state after this rotation is shown by a chain line. At the same time, the lower side of the retraction lever 7 rotates counterclockwise as shown in FIG. Then, the coupler receiver 8 is moved back and brought to the position shown by the chain line. Therefore, coupler 8 and coupler 11 protruding from the mount surface are drawn into the body mount 1, and the lens lock is released.

As explained in detail above, according to the present invention, when an autofocus interchangeable lens is attached to an autofocus camera that transmits lens drive power through the mount surface, the mount surface is used to position the lens for coupler engagement. It can be locked accurately, and even when attaching/detaching an interchangeable lens not for autofocus to the autofocus camera, it can be reliably locked and used, and each of the interchangeable lenses can be unlocked with a single release button. Summer.

[Brief explanation of drawings]

FIG. 1 is an external perspective view showing a camera in which the autofocus interchangeable lens attaching/detaching device according to the present invention is used, and FIGS. 2 to 4 show examples of the autofocus interchangeable lens attaching/detaching device according to the present invention. FIG. 2 is a perspective view as seen diagonally from the rear, FIG. 3 is a side view, and FIG. 4 is a rear view. Figure 5,
FIG. 6 is a diagram showing the retraction lever portion of the mechanism. FIG. 7 and FIG. 8 are diagrams for explaining the operation. 1...Body mount, 2...Lens lock release button, 3...Lock lever, 3a...Key part,
4...Lens bayonet, 4a...Lock groove, 5
...First lever, 5a...Shaft, 5b...Arm, 5
c...tongue, 6...second lever, 7...retraction lever, 8...coupler receiver, 9...first spring, 1
0...Gear, 11...Body side coupler, 12...
Main plate, 12a...Bending portion, 13...Second spring, 1
4...Brim, 15...Lens mount, 15a...
...Coupling hole, 16... Lens side coupler.

Claims (1)

[Scope of utility model registration request] This is an autofocus camera that transmits the driving force for moving the lens forward and backward using a coupler on the body side that rotates about an axis parallel to the optical axis and is biased in the direction of protruding and coupling to the mount surface. An autofocus camera that can be attached to either an autofocus interchangeable lens that has a coupling hole for the lens coupler that engages with the body coupler, or a non-autofocus interchangeable lens that has a coupling groove provided in the bayonet. In an attachment/detachment mechanism for an interchangeable lens used for autofocus, the body-side coupler is pivotally supported on the inside, is biased to protrude from the mount surface, and has a tip attached to the inner periphery of the coupling hole of the autofocus interchangeable lens. a coupler receiver that engages with the camera body; a retraction lever that moves the coupler receiver in the retracting direction; a lens lock lever that has a key portion at its tip that engages with a coupling groove of the non-autofocus interchangeable lens; It comprises a lens lock release button that can be operated from the outside and moves the retraction lever and the lens lock lever to the release side, and when the autofocus interchangeable lens is mounted, the coupler receiving tip is inserted into the coupling hole of the mount. When an interchangeable lens other than the autofocus lens is attached, the lens lock lever locks by engaging with the coupling groove of the bayonet, and the lens lock release button locks the lens. A mechanism for attaching and detaching an interchangeable lens for an autofocus camera, characterized in that the lock can be released even with an interchangeable lens.