JPH0618347Y2 - Waist level finder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a waist level finder suitable for a single-lens reflex camera, particularly a single-lens reflex camera having an internal exposure metering type automatic exposure control device.

[Conventional technology]

In an auto-exposure control camera that has a light-receiving element inside the camera and measures the subject brightness by the light passing through the shooting lens to automatically set the exposure amount, the external light entering from the finder section causes a photometric error to cause the exposure amount. It is widely known that there is a shortage.

It is also well known that even an automatic focusing camera having a distance measuring element inside the camera cannot measure distance due to the entry of external light.

In particular, in a single-lens reflex camera equipped with a waist level finder, extremely strong external light often enters from the finder side, resulting in a significantly large photometric error or inability to measure the distance.

Conventionally, a waist level finder used in a single-lens reflex camera has a foldable front lid, left and right side plates, and a rear frame that form a light-shielding portion around the lens, and an eyepiece lens is attached to the inner surface of the front lid. The holding frame is urged in the upright direction to be hinged, and is normally locked in a prone state against the urging force.

Then, when the lens holding frame is unlocked in the condition where the finder is opened, the lens holding frame is almost urged by its own urging force.
It rotates by 0 ° and comes into contact with a stopper provided separately to stop, and is kept in an upright state so that the fine fiber surface can be viewed.

[Problems to be solved by the device]

However, in such a conventional waist level finder, the front, back, left and right are almost completely shielded in the open state, but the upper part is in the open state, so when it is outdoors, it is in the sky or direct sunlight. However, in a room, the bright light of the ceiling light may enter the light receiving element inside through the finder surface, resulting in a photometric error or an inability to measure the distance.

Therefore, in such a case, an attempt has been made to raise the lens holding frame and bring the eye closer to the eyepiece to block external incident light by the face. It has been impossible to completely block the external light entering through the gap between them and the external light entering through the eyepiece through the gap between the face and the eyepiece.

In addition, since the raised lens holding frame is only urged upward with an extremely weak force, the lens holding frame is often removed when the face is brought as close as possible to the eyepiece to reduce the entry of outside light. It was pushed down by the face and fell, resulting in a blur of the fienda surface.

In order to solve such a problem, a box-shaped light-shielding hood having an eyepiece at the upper part hermetically covers the fiber opening, and the face is brought into close contact with an eye-cup provided around the eyepiece. There is also a non-foldable waist level finder that blocks the entry of outside light, but the camera has become extremely large and has problems in portability.

It is an object of the present invention to solve the above-mentioned conventional problems and provide a waist level finder with good portability that can completely prevent the entry of external light.

[Means for Solving the Problems]

In order to achieve the above object, the waist level finder according to the present invention has a foldable front lid, left and right side plates and a rear frame, and a lens holding frame having an eyepiece attached to the inner surface of the front lid is attached in a standing direction. In a waist level finder that is urged and hinged, and the lens holding frame is normally locked in the prone state against the urging force, the outer peripheral part of the lens holding frame is located on the left and right side plates and the upper part of the rear frame. With a bent portion that can be locked while keeping the light-shielding state, a lock member that can lock the lens holding frame in the upright state on the rear frame, and a retractable eyecup on the outer peripheral portion of the eyepiece lens Is.

[Action]

With the above configuration, when the lens holding frame is unlocked with the waist level finder open, the lens holding frame stands up by its own biasing force, and its outer peripheral portion bends the left and right side plates and the rear frame. The lens is brought into contact with and locked by the portion, and external light is prevented from entering from the periphery of the lens holding frame.

When the eyecup is extended in this state to bring the eye closer to the eyepiece lens, the external light that comes in close contact with the eyecup and passes through the eyepiece lens is completely blocked.

At this time, even if the face presses the lens holding frame downward through the eyecup, the lens holding frame is locked in the upright state by the lock member, so that the lens holding frame is lowered only by contracting the eyecup. There is no fear that the eyepiece lens is always held in the proper position so that the user can clearly see the viewfinder surface.

Further, even when the waist level finder is folded while the lens holding frame is laid down while the eyecup is extended, the eyecup is automatically reduced by being pushed by the left and right side plates, and there is no risk of damage or the like.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 to 3 show an embodiment of the present invention.

First, the outline of the waist level finder according to the present invention will be described with reference to FIG.

The front lid 1 is pivotally attached to the front portion of the frame body 2 by a shaft 3 so as to be openable and closable, and is biased in a closing direction by a spring 4, and a hinge 5 is provided on the inner surface to raise and lower one end of the lens holding frame 6. It is hinged freely, and a spring 7 biases the lens holding frame 6 in the upright direction.

In the vicinity of both ends of the inner surface of the front lid 1, an inwardly bent portion 8
The left and right fixed side plates 8 having a are fixedly provided, and the locking lever 10 is pivotally supported on the outside of the right fixed side plate 8 by the shaft 9 by the spring 11 in the clockwise direction in the figure, and its lower end portion. Locking claw 10
a and guide the locking claw 10a to the inside through the opening formed in the fixed side plate 8 to form the peripheral edge 6a of the lens holding frame 6.
Can be locked in the prone state, and the locking of the lens holding frame 6 can be released by driving the operating portion 10b provided at the upper end in the direction of arrow A.

Then, the front end portions of the left and right front side plates 13 having the bent portions 13a on the upper side are connected to the rear end portions of the fixed side plates 8 via hinges 12 and are biased outward by springs 14, respectively. 1
The front end portions of the left and right rear side plates 16 each having a bent portion 16a on the upper side thereof are connected to each other via the hinges 15 at the rear end portions of the rear side portion 3, and the rear end portions of the rear side plate 16 are connected to the upper and lower sides by the left and right hinges not shown. The left and right inner ends of the rear frame 17 having the bent portions 17a are connected to each other.

Further, the middle part of the rear frame 17 is connected to the upper edge of the connecting plate 19 by a hinge 18, and the lower end of the connecting plate 19 is pivotally attached to the rear part of the frame body 2 by a shaft 20.

The knobs 21 provided at the left and right ends of the rear portion of the frame body 2 are operation members for attaching the waist level finder to the camera side.

Next, the structure of the main part of the present invention will be described mainly with reference to FIG.

The lens holding frame 6 has peripheral portions 6a formed on three sides of the outer peripheral portion,
A through hole (not shown) into which the eyepiece lens frame 23 having the eyepiece lens 22 is fitted is provided in the central portion, and a cutout portion 6b is formed at a position symmetrical with respect to the center of the throughhole, and the cutout portion 6b has an eyepiece lens frame. When the protrusion 23a protruding from the connector 23 is inserted and the attachment / detachment knob 24 is slid in the direction of arrow B, the attachment / detachment knob 24
The locking claw 25 provided on a ring (not shown) integral with
The eyepiece lens frame 23 can be fixed by locking 3a.

On the outer peripheral portion of the eyepiece lens frame 23, a two-step retractable eyecup 26 made of an elastic material such as rubber is fixedly provided.

A lock member 28 is pivotally attached by a shaft 27 provided on the upper bent portion 17a of the rear frame 17 and is biased by a spring 29 in the direction of arrow C to form a claw portion 28a at the bent portion. At the same time, the release pin 30 is planted in the other end bent portion, and the through hole 17b (see FIG. 2) provided in the rear frame 17 is inserted to project to the rear portion, and the lens holding frame 6 is erected by the claw portion 28a. It is locked in this state to prevent it from turning in the prone direction, and the release pin 3
By pressing 0 against the biasing force of the spring 29, the locking of the lens holding frame 6 can be released.

Next, the operation of the embodiment configured as described above will be described.

In the waist level finder open state shown in FIG. 2, front and rear, left and right, front and rear frames 17 and left and right front and rear side plates 13 and 16 completely block outside light from entering from the surroundings.

From this state, the operating portion 10b of the locking lever 10 is moved to the spring 11
When driven in the direction of arrow A against the urging force of the lens holding frame 6, the locking lever 10 is rotated counterclockwise to release the locking of the lens holding frame 6 by the locking claw 10a. It is rotated in the counter time direction by the force, and its peripheral edge portion 6a has left and right front and rear side plates 13 and 16 and bent portions 13a and 16a of the rear frame 17.
And 17a to stop and come into the state shown by the solid line in FIG.

In this state, the claw portion 28a of the lock member 28 locks the lens holding frame peripheral edge portion 6a to prevent the lens holding frame 6 from rotating in the prone direction, so that the eyecup 26 is extended and the face is closed. Eyepiece lens 2 by pressing the eyecup 26 against the eyecup 26.
Even if you peep through the finder surface through 2, the eyecup 26
The lens holding frame 6 does not lower just by contracting
You can always see the fidelity surface clearly.

In order to store the lens holding frame 6, first, the eye cup 26 is contracted and the release pin 30 is pushed inward to lock the lens 28.
Is rotated counterclockwise against the spring 29, and in the state in which the locking of the lens holding frame 6 by the claw portion 28a is released, the vicinity of the free end of the lens holding frame 6 is pressed downward to move the lens holding frame 6 approximately 90 degrees right. When it is rotated in the turning direction, the peripheral edge portion 6a is locked by the locking lever 10 and is held in the prone state.

Further, in order to fold the waist level finder, the vicinity of the hinge 15 connecting the left and right front and rear side plates 13 and 16 is pushed inward against the biasing force of the spring 14, and the left and right front and rear side plates 13 and 16 are separated. The rear frame 17 that is folded and connected to the left and right rear side plates 16 moves forward, and the connecting plate 19 hinged to the rear frame 17 rotates about the shaft 20. The front lid 1 is inclined so as to move forward, is folded so as to cover the upper portion thereof, and is held in the closed state by the biasing force of the spring 4 to be in the state shown in FIG.

When the waist level finder is folded after the lens holding frame 6 is retracted, the eye cup 26 may remain extended, and the fold of the waist level finder causes the eye cup 26 to move to the inner surface of the left and right front side plates 13. It is pushed and naturally shifts to a contracted state.

In order to open the waist level finder from this folded state, the vicinity of the free ends of the left and right sides of the front lid 1 may be lifted against the spring 4.

When the eyepiece lens 22 is replaced according to the diopter of the photographer, the attachment / detachment knob 24 of the lens holding frame 6 is rotated in the direction opposite to the arrow B, and the locking claw 25 is moved to the eyepiece lens frame 23.
After removing the eyepiece lens frame 23 by detaching it from the projection 23a, an eyepiece lens frame having an eyepiece lens of a required frequency may be attached.

In the above embodiment, the case where the present invention is applied to the waist level finder that can be opened in one movement has been described, but the front lid, the left and right side plates, and the rear frame are independently hinged to the frame body. It can be applied to existing waist level finder without any problems.

[Effect of device]

As described above, in the waist level finder according to the present invention, the peripheral portion of the lens holding frame that holds the eyepiece and can be undulated is shielded by the bent portions provided on the left and right side plates and the rear frame when the lens holding frame is raised. Since the locking is performed while keeping the state, it is possible to exclude external light entering the fiber surface from the gap between the lens holding frame, the left and right side plates and the rear frame, which is seen in the conventional waist level fiber.

In addition, since a retractable eyecup is provided on the outer circumference of the eyepiece of the lens holding frame, the face can be brought into close contact with the eyecup when observing the viewfinder surface. The outside light that enters is completely blocked.

Further, since the locking member that locks the lens holding frame in the upright state is provided, even when the face presses the eyecup downward, the lens holding frame may be lowered and the fiber surface may be blurred only by the contraction of the eyecup. It is possible to always observe a clear field image.

[Brief description of drawings]

FIG. 1 is a rear perspective view of an essential part of an embodiment of the present invention in an open state, FIG. 2 is a rear perspective view of the same in its open state, and FIG. 3 is its folded state. It is a rear perspective view. 1 ... Front lid, 2 ... Frame body 6 ... Lens holding frame, 13 ... Front side plate 16 ... Rear side plate, 17 ... Rear frame 19 ... Connection plate, 22 ... Eyepiece 26 ... Eye cup, 28: Lock member

Claims (1)

[Scope of utility model registration request] 1. A lens holding frame having a foldable front lid, left and right side plates, and a rear frame, and an eyepiece mounted on the inner surface of the front lid is urged in a standing direction to be hinged, and at the same time, the lens is always attached. In a waist level finder that locks the holding frame in a prone state against its biasing force, locks the outer peripheral portion of the lens holding frame above the left and right side plates and the rear frame while keeping the light shielding state. A waist level characterized in that a bent portion is provided, a lock member capable of locking the lens holding frame in an upright state is provided on the rear frame, and a retractable eyecup is provided on an outer peripheral portion of the eyepiece lens. Fianda.