JPH0750297B2 - Interchangeable lens with switching contacts for two types of cameras - Google Patents

Description

TECHNICAL FIELD The present invention relates to an interchangeable lens having switching contacts capable of transmitting information to a plurality of cameras.

(Prior Art) Recently, cameras with a built-in automatic exposure control device have become widespread. These are automatic control modes such as shutter speed priority or aperture priority in order to achieve proper exposure, and the photographer can freely set shutter speed, aperture, etc. It is equipped with a manual control mode and the like for setting desired image capturing elements and performing desired image capturing.

The interchangeable lens attached to this type of camera must be able to realize these modes corresponding to the above-mentioned modes on the camera side. Generally, an electrical contact is provided on the mount part of the interchangeable lens, and this is attached to the camera body side. The electrical contact provided on the mount part is opposed to transmit the switching information on the lens side to the camera body side. (For example, actual development Sho 56-126627
No. 57-3222) (Problems to be solved by the invention) By the way, the setting positions of the electrical contacts provided on the mount part on the camera side are different for each manufacturer, and they are mounted on each. There is no compatibility between interchangeable lenses.

In other words, replace the interchangeable lens attached to the camera body of company X with Y.
Even if it is mounted on a camera body manufactured by a company, it is not possible to transmit the switching information from the lens side to the camera side because the positions of the electrical contacts are slightly different.

So if you try to use lenses on both cameras,
Two kinds of interchangeable lenses with different mounts must be prepared, which is very inconvenient for the user, and it is also troublesome and uneconomical in production.

Therefore, it is an object of the present invention to provide an interchangeable lens which can be attached to two types of cameras having different electrical contact setting positions by a simple structure to transmit information and convenient to use.

(Means for solving the problem) A support ring for a diaphragm ring and a mount ring are integrally provided at the end of the fixed lens barrel, and a cutout portion in a certain range is formed on the side surface of the support ring, and the cutout portion is flat. A contact plate composed of a flat portion, a wide inclined portion, and a forked portion is attached and disposed, and the first flat portion facing the electrical contact of the mount portion of one camera is mounted on the flat portion.
The contact member is attached to the outer peripheral wall of the mount ring so as to be retractable, and the inner peripheral wall of the mount ring has a contact portion at one end capable of contacting the forked portion of the contact plate, and the outer peripheral wall of the mount ring at the other end. A wiring board having a second contact member that penetrates through the second contact member and faces the electric contact of another type of camera mount,
It is characterized in that the contact plate is switched by rotating the diaphragm ring.

(Function) Attach the interchangeable lens to one camera through the mount ring, rotate the diaphragm ring to align the A mark on the diaphragm ring with the index on the fixed lens barrel, and the contact plate will project inside the diaphragm ring. Is pushed backward by the strip, the first contact member projects from the mount surface to connect to the electrical contact of the camera mount portion, and the tip contact piece of the contact plate contacts the contact portion of the wiring board,
It becomes a state to transmit the switching information on the lens side to the camera side,
In this state, if the lens is removed from the camera and mounted on another type of camera, the second contact member can be connected to the electrical contact of the camera mount section to transmit information, and the diaphragm ring can be rotated to move the information on the ring. If the aperture value matches the index, the contact plate returns to the original state, and the automatic control state is switched to the manual control state.

(Embodiment) Referring to the drawings, an embodiment of the present invention will be described. In FIG. 1, reference numeral 1 denotes a fixed lens barrel of a zoom type interchangeable lens, in which a zoom lens is built in and focusing is performed by rotating an operation ring 2. The camera is equipped with a support ring 3 at the right end of the fixed lens barrel 1 and a bayonet portion 5a at the rear end of the fixed lens barrel 1 by moving the lens in the optical axis direction back and forth. Mount ring to 5
Are continuously and integrally provided, and the diaphragm ring 4 is rotatably arranged from the outer circumference of the right end portion of the fixed lens barrel 1 to the outer circumference of the support ring 3. The diaphragm ring 4 is as shown in FIG. In addition, there are a high annular protrusion 4a that abuts on the right end of the fixed lens barrel 1 and a low protrusion 4b that abuts on the outer periphery of the support ring 3 and a part of the lower side of which is notched to match the notch of the support ring 3. It is provided.

A cutout portion 3a having a required length range (a range that can face the position where the electric contacts on the camera side can be disposed) is provided on the rear side surface of the support ring 3 (on the mount ring side), and the cutout portion 3a is electrically conductive. One end of a contact plate 6 made of an elastic material is screwed as shown in FIG. 3B, and the contact plate 6 has a flat portion 6a that abuts the side surface of the notch member and a rearward (mount ring side) inclination and an outer edge. It is composed of a wide inclined portion 6b having an engaging edge 6d protruding from the outer peripheral edge of the support ring 3 so as to easily engage with the protrusion 4b of the aperture ring, and a forked portion 6c having an arcuate contact piece at the tip. The first contact pin 7 biased rearward by the winding coil spring 8 is attached to the flat portion 6a, and its attachment end is in the hole 3b formed in the notch portion 3a of the support ring 3. It is recessed, and its tip is one under the outer peripheral wall 5b of the mount ring 5 as shown in FIG. Is inserted into the through hole 9 formed so as to face the contact point of the X camera side mount portion, and is drawn inward from the mount surface 5c of the mount ring 5 (the surface that contacts the mount portion of the camera body).

Further, as shown in FIG. 3A, an insulating hole 10 is formed in the outer peripheral wall 5b of the mount ring 5 at a position facing the contact of another Y camera at a circumferential interval from the through hole 9 for the first contact pin 7. The inner surface of the outer peripheral wall 5b is provided with a wiring board 11 having two notches 11a and 11b for printed wiring on an insulating plate and passing contact pins at the lower edge, as shown in FIG. Is worn
A leaf spring 13 having a second contact pin 12 at the inner end is attached to one end side of the wiring board 11, and the contact pin 12 passes through one notch 11b and penetrates the insulating hole 10 of the mount ring 5 to the rear side. A wide contact portion 11c on the other end side of the wiring board 11.
Are formed.

Based on the above-mentioned configuration, as shown in FIG. 1, the interchangeable lens is connected to one X camera through the mount ring 5 while the aperture value 14a on the aperture ring 4 is adjusted to the index 15 on the fixed lens barrel 1. When attached to the contact plate 6 as shown in FIG. 2 and FIG.
Is not activated, the first contact pin 7 does not contact the electric contact X ₁ on the camera side when the first contact pin 7 is pulled in from the mount surface 5c of the mount ring 5, and the arcuate shape of the forked portion 6c of the contact plate 6 Since the contact piece is also separated from the contact portion 11c of the wiring board 11, both are not in the energized state and the exposure is performed by the manual control. In this case, the second contact pin 12 of the mount ring 5 is pushed by the mount surface on the camera side and retracted toward the fixed lens barrel 1 side, so that the lens is not hindered.

On the other hand, the "A" mark 14b on the aperture ring 4 is fixed to the fixed lens barrel 1
When the diaphragm ring 4 is rotated in the direction of the arrow in FIG. 1 in order to match the index 15 above, one end face of the low protrusion 4b on the inside of the diaphragm ring 4 can be seen as shown in FIG. 6 engages with the engaging edge 6d and the inclined portion 6b of the contact point 6 and pushes the contact plate 6 rearward, where the contact plate 6 tilts rearward as shown in FIG. 7 is the outer peripheral wall of the mount ring
It projects from the mount surface 5c of 5b, contacts the contact X ₁ on the X camera side, transmits the switching information from the interchangeable lens side to the X camera side, and switches to the automatic control state.

At this time, the arcuate contact piece provided at the tip of the bifurcated portion 6c of the contact plate 6 is in contact with the wide contact portion 11c of the wiring board 11 provided on the mount ring 5.

In this state, that is, with the “A” mark 14b of the aperture ring 4 aligned with the index 15 on the fixed lens barrel 1, the interchangeable lens is removed from the X camera and mounted on another Y camera. The second contact pin 12 attached to 5 is Y
By connecting to the electric contacts on the camera side, the switching information on the lens side is transmitted to the Y camera side via the contact plate 6 and the wiring board 11.

At this time, the first contact pin 7 is pushed by the mount ring portion of the Y camera and drawn toward the fixed lens barrel 1 side, so that there is no hindrance to the mounting of the Y camera.

On the other hand, when the X camera or the Y camera is attached, the aperture ring 4 is rotated in the direction opposite to the arrow to set the aperture value 14a to the index 1.
In accordance with 5, since the end face of the inner protrusion 4b of the aperture ring is separated from the inclined portion 6b of the contact plate 6, the contact plate 6 returns to the state shown in FIG. Through hole 9
In addition, the arc-shaped contact piece of the contact plate bifurcated portion 6c separates from the contact portion 11c of the wiring board 11, and the electrical connection to the lens side is disconnected in both the X camera and the Y camera, and the manual operation is performed. It is switched to the control state.

(Effect of the Invention) As described above, according to the present invention, by mounting one interchangeable lens on each of two types of cameras having different electrical contact setting positions, the switching information on the lens side can be reliably attached to the camera side. It is possible to transmit, it is not necessary to prepare a lens dedicated to each camera for shooting, it is very convenient for use, and also in terms of production, two interchangeable lenses with the same mount specifications but different mount parts are used. There is no need to make a type, it is efficient and the cost can be reduced, and since the switching means is of the leaf spring type, it has an advantage that it can be compactly assembled without requiring an extra space.

[Brief description of drawings]

FIG. 1 is a partially cut side view of an embodiment of the present invention. FIG. 2 is an enlarged view of the circle portion of FIG. FIG. 3A is an exploded perspective view of a support ring and a mount ring portion. FIG. 8B is a perspective view showing a state where the contact plate is attached to the support ring. FIG. 4 is an exploded perspective view of the front portion of the mount ring. FIG. 5A is a side view when the contact plate is not operated. The same figure (b) is a side view when operating the contact plate. In the figure, 1 ... Fixed lens barrel, 2 ... Operating ring, 3 ... Support ring, 3a ... Notch, 4 ... Aperture ring, 4b ...
...... Mount ring, 5a …… Bayonet part, 5b …… Outer peripheral wall,
5c ... Mounting surface, 6 ... Contact plate, 6a ... Flat part, 6b ...
… Sloping part, 6c …… Forked part, 7 …… First contact pin, 9 ……
Through hole, 10 ... Insulating hole, 11 ... Wiring board, 12 ... Second contact pin.

Claims (1)

[Claims] 1. A support ring for a diaphragm ring and a mount ring are integrally provided at an end of a fixed lens barrel, a cutout portion is formed in a certain range on a lower side surface of the support ring, and the cutout portion has a flat portion and a wide slope. One end of a contact plate consisting of a fork and a fork is attached and arranged, and a first contact member facing the electric contact of the mount of one camera is freely retractable from the outer peripheral wall of the mount ring on the flat part. Attached to the inside of the outer peripheral wall of the mount ring, one end has a contact part that can contact the forked part of the contact plate, and the other end penetrates the outer peripheral wall of the mount ring to be an electrical contact of another type of camera mount part. An interchangeable lens having switching contacts for two types of cameras, characterized in that a wiring board to which a facing second contact member is attached is mounted, and the contact plate is switched by rotation of a diaphragm ring.