JPS62211626A - Finder switching device of camera - Google Patents

Abstract

PURPOSE:To constitute the titled device so that a finder does not operate in case of a lock state, by interlocking an operating member for displaying the lock state of a camera, and a finder optical system. CONSTITUTION:By moving a focus switching operating member 1 which is slid by a manual operation, and displays a lock state of a camera, and a focal distance of a photographic lens to be used, by an off-display and WIDE, TELE, respectively, a finder frame 7 is turned by a cam lever 5 which is engaged to the member 1 and operated, and also, sliding piece 4 interlocked with the lever 5 outputs a state displayed by the member 1, to an electrically-driven function part of the camera by an electric signal. When the camera is in a lock state, the frame 7 is inclined at 45 degrees against the lever 5, a finder optical system is not formed, and in such a case, a mistake for releasing a release is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a finder switching device for a camera, and more particularly to a finder switching device for a camera capable of focus switching.

[Background of the invention]

Many cameras are equipped with a safety lock mechanism that locks various parts of the camera in an inoperative state when the camera is not in use, and bifocal switching type cameras that have recently been commercially available also do not have such a safety lock mechanism. has been adopted.

However, the locking mechanism used in the above-mentioned known cameras has the disadvantages that the photographer easily forgets to release the lock, the structure is complicated, and the camera becomes expensive.
Alternatively, there were drawbacks such as turtle 2 dispersing.

For example, many conventional cameras are equipped with a locking mechanism that allows you to notice that it is locked only when you release the camera to take a picture. I often ran away.

In addition, some conventional cameras are equipped with a locking mechanism that covers the viewfinder when in lock mode, but while such a locking mechanism makes it easy for the photographer to recognize the locked state, Due to the complicated mechanism, it was inevitable that the camera would become deaf and expensive.

Generally, it is preferable that the locked state of the camera can be recognized before the release operation, and it is also preferable that the locking mechanism be small and simple. In particular, with cameras that require an additional action before the release operation, such as bifocal cameras, the locking mechanism has a structure that takes time to release the lock or delays recognition of the locked state. The locking mechanism must be simple and compact in order to reduce the weight and size of the camera.

[Purpose of the invention]

An object of the present invention is to provide a finder switching device with a locking function, and more specifically, to provide a finder switching device for use in a camera capable of focus switching.

[Summary of the invention]

The finder switching device according to the present invention has an optical system of the finder and a focus switching operation member that moves slowly and displays the locked state and ready state of the camera, and the focus switching operation member is positioned at the locked state display position. The present invention is characterized in that an interlocking structure between the focus switching operation member and the optical system is configured so that the optical system of the finder is in a disabled state at certain times.

Therefore, this finder switching device! With cameras equipped with this function, you can tell whether the camera is locked or not just by looking at the stop position of the focus switching operation member.
Even if you neglect to check this, you can immediately recognize the locked state of the camera by looking through the viewfinder, so unlike conventional cameras, you do not notice the locked state after the release operation.

Furthermore, with the viewfinder switching device of the present invention, the operation to lock the camera and the operation to disable the viewfinder are performed at the same time, so there is no need to perform a special locking operation, and moreover, the focus switching operation and the unlocking operation are performed simultaneously. Since the operations are performed in the same manner, the operation of the focus switching type camera is facilitated, and it is possible to prevent the cameras from becoming popular or becoming expensive.

[Embodiments of the invention]

An embodiment of a camera equipped with a finder switching device of the present invention will be described below with reference to the drawings.

The camera shown in this example is a contour camera that can change the photographing magnification, and only the viewfinder system can be switched by short focus/long focus switching operation, and the photographing lens can be switched according to release methane suppression operation. It is a new type of camera.

1 to 3 are exploded perspective views of the finder switching device of this embodiment. The finder switching device includes a focus switching operation member (that is, a photographic mode switching knob) 1, a lever 2 that is linked to the knob 1, a cam lever 5 carried by the lever 2, and a positioning control using the cam lever 5. It consists of a viewfinder frame 7 that can be accessed.

The photographing mode switching knob 1 is supported on a camera body (not shown) so as to be slidable in the direction of the arrow in FIG. On the turtle 2, there is a WI in the sliding direction of the knob 1.
Three marks are displayed: DE (short focus photography), OFF (camera lock or inactive), and TILE (long focus photography). When the knob 1 is moved by hand, the knob 1 is configured to be locked in that position by a click mechanism.

A rectangular plate-shaped lever 2 that can move in the same direction as the knob L is arranged below the photographing mode switching knob 1. A pin 1a protruding from the lower surface is engaged, and the knob 1 and lever 2 can move together via this pin 1a.

The lever 2 has an elongated hole 2a extending parallel to the moving direction of the knob 1, and a pin 3 protruding from a camera lock or the like can be inserted into the elongated hole 2a. The pin 3 guides the elongated hole 21 in the longitudinal direction. Further, an arm 2C is provided protruding from one side edge of the lever 2, and a sliding contact piece 4 integrated with the arm 2C is supported.

The sliding contact piece 4 slides on a fixed conductor pattern (that is, a fixed contact) not shown, and the position of the lever 2 and the knob 1 is determined by an electronic circuit (not shown) connected to the nine turns. is input as an electrical signal.

A pin 2e is provided protruding from the surface of the right end of the lever 2,
A cam lever 5 is pivotally attached to the pin 2 and is pivotable about the pin in a horizontal plane.

The cam lever 5 has a hole 5at in the center where the pin 2C is inserted, and a stop horn 4 piece 5C on the left end that engages with one side line of the lever 2, and a finder frame 7 on the right side of the hole 5 and the side. Slope 5 that engages with the upper protruding pin 7b
bt-equipped. Pin 2 inserted into hole 5S @
is fitted with a torsion spring 6, one leg 6a of this spring 6 is engaged with the side edge 5d of the cam lever 5, and the other leg 6b of the spring 6 is fitted with a spring protruding from the lever 2. The hook engages with the outer peripheral surface of the working pin 2d. Therefore, by the action of the torsion spring 6, the cam lever 5 is moved to the first to third positions around the υ pin 2.
In the figure, the cam lever 5 is subjected to a clockwise torque, and the stopper piece 5C is pressed against one side edge of the lever 2, so that the cam lever 5 is always held in the same position relative to the lever 2.

The finder frame 7 has two sides that are perpendicular to each other on a horizontal plane, and a WIDE objective lens 9 is attached to the lower side of one of the sides, while a WIDE objective lens 9 is attached to the lower side of the other side.
An objective lens 10 is attached. Further, a shaft 7a for rotatably supporting the finder frame 7 on a camera body, etc. is protruded above the intersection of the two sides, and this shaft 7a is provided on the camera body, etc. It is designed to be rotatably inserted into the shaft hole. A torsion spring 8 is fitted onto the shaft 7a, and one O-leg 8 of the torsion spring 8 is fitted into the shaft 7a.
& engages with the outer peripheral surface of the protruding bin 7b of the finder frame 7,
The other leg 8b is engaged with a structural member (not shown). Therefore, the finder frame 7 is moved by the torsion spring 8 into the shaft 7at-
It is energized counterclockwise in FIG. 1 as the center.

11 is a frame reflective lens, 12 is an eyepiece lens, and both lenses 11 and 12 are fixed to the camera body.

When a camera having such a finder switching device as described above is to be put out of use, the Δ mark on the photographing mode switching knob 1 is aligned with the OFF mark on the camera body as shown in FIG. In this state, each side of the 7-inder frame 7 is inclined at 45 degrees with respect to the sliding direction of the lever 2, so that the WI
Since both the DEID lens 9 and the EE objective lens 10 are tilted at 45 degrees with respect to the frame reflective lens 11, the finder optical system is disabled in this state, and the eyepiece lens 12 You can't see anything even if you look ahead.

On the other hand, since the sliding contact piece 4 carried by the lever 2 is in contact with the camera lock contact on the conductor mother turn (not shown), the camera is electrically connected to the electronic circuit connected to the conductor pattern. remains inactive.

Therefore, the photographer should check that the Δ mark on the shooting mode switch knob 1 is ON.
If you check that it matches the F mark, you will know that the camera is locked, and even if you neglect to check, you will not be able to see anything when you look through the viewfinder, so the camera will be locked immediately. I can understand 8g of what is going on.

(1) When shooting with short focus (WIDE).

When the photographer holds the camera and moves the mode switching knob 1t from the OFF position as shown in Figure 1 to the WIDE position as shown in Figure 2, the lever 2 and cam lever 5 also move to the left, causing the pin 7b on the viewfinder frame 7 to move. cam surface SbK& is moved relative to the tip side of the cam lever 5. Then, since a counterclockwise torque is applied to the finder frame 7 by the spring 8 around the shaft 7 and the metal center, the finder frame 7 rotates counterclockwise around the shaft 7a as the cam lever 5 moves leftward. Finally, as shown in FIG. 2, the WIDE objective lens 9 stops at a position directly facing the frame reflection lens 11. Therefore, it becomes possible to see the object field through the WIDE objective lens 9, which was previously not visible through the eyepiece lens 12. In addition, the sliding contact piece 4
is in contact with the knock turn for WI DE on a conductor pattern (not shown), so a WI DEE switch is turned on in the electronic circuit (not shown), and short-focus photography becomes possible.

(11) During long focus shooting (position E).

When the photographer moves the mode switching knob 1 to the right in FIG. After moving up the slope 5bKB to the front side, it moves to the side edge of the cam lever 5. Therefore, the bin 7b is pushed toward the front in the figure by the cam lever 5, and the finder frame 7 is rotated clockwise about the shaft 7a.
Finally, as shown in FIG.
is positioned. Therefore, the optical system of the finder is
The subject can be viewed through the lens 10, which is set to suit the user's needs.

On the other hand, as the lever 2 moves to the right, the sliding contact piece 4 also moves together with the lever 2, and in the position shown in FIG. A switch for position E is turned on in an electronic circuit (not shown).

Therefore, it becomes possible to execute the position E in an electronic circuit (not shown).

〔Effect of the invention〕

As explained above, in the finder switching device of the present invention, the focus switching operation member for locking and unlocking the camera and the optical system of the finder move slowly. You cannot prepare for shooting or release the lock without operating any of the components, and at the same time, the viewfinder cannot be seen through, which prevents you from making the mistake of neglecting to release the lock before releasing the camera. In addition, it is possible to immediately detect whether or not the lock release operation has been performed, and at the same time, it is possible to reduce costs by 7 months by using the lock operation member and the switchover member.

[Brief explanation of drawings]

@Figures 1 to 3 are perspective views of one embodiment of the present invention 69,
Figure 1 shows the state when the camera is locked, Figure 2 shows the state when trying to perform short focus photography, and Figure 3 shows the state when trying to perform long focus photography. The diagram is Ruru. 1...Focus switching operation member 2...Lever 4...Sliding contact piece 5...Cam lever 7...Finder frame 9...-WIDEj objective lens 12.
・・Eyepiece lens diagram 3

Claims (1)

[Scope of Claims] A finder switching device for a camera that is equipped with a photographic lens that can switch its focus and is also equipped with a finder device that is switched when switching the focus of the photographic lens, comprising: an optical system of the finder device; A non-operating area of the camera is provided in the middle of the movement range of the focus switching operating member, and when the focus switching operating member is positioned in the non-operating area, the finder device 1. A finder switching device for a camera, characterized in that an interlocking structure between the focus switching operation member and the optical system is configured such that the optical system is in a non-established state.