JP2001033849A - Finder device and camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a compact and inexpensive finder capable of intercepting stray light from a photographing system and easily interlocked with an external operation member while preventing reversely entering light from the finder by making a reflection member just near an ocular part turnable. SOLUTION: A 2nd rectangular mirror 10 for guiding light from a 1st mirror 9 reflecting the light from a pentagonal prism 7 to the lower side of a camera to an ocular part is made turnable by manual operation. By sliding an actuation lever 12 in a leftward direction by external operation, the mirror 10 is rotated to a perpendicular position where it is made to abut on the surface of an ocular 11. By turning the mirror 10 to a position where it is made in parallel with an eyepiece 14, the reversely entering light from the ocular part is totally reflected by the mirror 10, and an optical path into the camera is perfectly intercepted. Furthermore, a turning mechanism is arranged just near the ocular part, the compact turning mechanism easily interlocked with the external operation member without making a camera head large as shown in the conventional example is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a finder device and a camera mainly applicable to a camera such as a single-lens reflex camera.

[0002]

2. Description of the Related Art Light that enters through an eyepiece of a viewfinder (hereinafter referred to as "reverse light") during self-timer photographing, long exposure photographing, or the like is exposed to film or TTL (Through).
There is a known problem that it affects the photometry of h The Lenz).

In order to solve this problem, a technique disclosed in, for example, Japanese Patent Laid-Open No. Hei 5-188434 (see FIG. 4) has been proposed.

[0004] That is, the finder optical system constituting the finder 3 includes the photographic lens 1 in order from the upstream side of the light.
, A focusing plate 8 disposed at a position of a primary image plane on which a primary image is formed, a first condenser lens 9, a first mirror 10 for directing light from the condenser lens 9 forward, and a first mirror Second mirror 11 for directing light from 10 upward
A relay auxiliary lens 1 for forming a reduced virtual image of a primary image of the focusing screen 8 on the downstream side of light from the focusing screen 8
2 and the light from the relay auxiliary lens 12 to the photographing lens 1
Third mirror 13 that is parallel to the optical axis of
A zoom relay lens system 14 that functions as an objective lens system for forming a secondary image and is used for pseudo-zoom;
A fourth mirror 15 for directing light from the zoom relay lens system 14 downward, a second condenser lens 16, and a field frame 17 disposed at a position of a secondary image plane on which a secondary image is formed.
And a fifth mirror 18 for directing light passing through the field frame 17 parallel to the optical axis of the photographing lens and backward, and a fixed eyepiece 19. The third mirror 13 is installed at the camera head downstream of the optical path from the position where the photometric element 31 is arranged,
By driving the third mirror 13 by driving a mirror rotation motor 127 which is a step motor to block an optical path,
This is to prevent entry of reverse incident light from the eyepiece 19 which adversely affects the photometry of the image on the film 5 and the focusing screen 8.

Further, there has been proposed a system in which an eyepiece shutter is independently provided and closed, thereby preventing reverse light incidence.

[0006]

However, in the above conventional example, light from the photographing system is reflected by the third mirror 13 rotating at the camera head, becomes stray light, and returns to the photographing system again. This has the adverse effect of directly entering light on the film surface.

Further, since the rotating third mirror 13 is disposed on the camera head, the driving mechanism itself, such as disposing a mirror rotating motor 127 as a step motor, becomes complicated, and is expensive. There was a problem that it led to an increase in size.

The present invention has been made in view of the above points, and prevents stray light from a photographing system while preventing back light from a finder, and facilitates interlocking with an external operation member to increase the size of the apparatus. It is an object of the present invention to provide a compact and inexpensive finder device and a camera without doing so.

[0009]

In order to achieve the above object, the present invention provides a finder device in which a reflecting member for bending an optical path is vertically arranged near an eyepiece.
It is characterized in that the reflection member in the vicinity of the eyepiece among the reflection members is rotatable.

[0010] The reflecting member in the immediate vicinity of the eyepiece may include:
The operation lever is slid by an external operation, whereby the operation lever is rotated to an optical path blocking position in contact with the eyepiece.

[0011] A light metering means for performing TTL light metering is provided in the vicinity of the reflecting member above the eyepiece of the reflecting member.

A camera further comprising the finder device according to any one of claims 1 to 3.

[0013] In the above configuration, particularly in the finder device in which the reflecting member for bending the optical path is disposed vertically above and near the eyepiece, the reflecting member in the vicinity of the eyepiece among the reflecting members is rotatable. A finder that can prevent light from entering can be realized. Further, according to the camera of the present invention, accurate photometry and distance measurement can be performed, and film exposure due to leakage of stray light that cannot be prevented by the main mirror can be prevented.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIG. 1 is a drawing which best illustrates the features of the present invention, and shows a cross section of a state in which the embodiment is applied to a single-lens reflex camera.

In FIG. 1, reference numeral 1 denotes a camera body, and 2 denotes a photographic lens system provided in a lens barrel. The lens barrel itself is usually detachable from the camera body 1.

Reference numeral 3 denotes a main mirror for reflecting light from the photographing lens system 2 upward, and reference numeral 4 denotes a submirror for directing a part of the light from the photographing lens system 2 to an AF (automatic focus detection) module 5.

Reference numeral 6 denotes a focusing plate disposed at the position of the primary image plane formed by the photographing lens system 2, and reference numeral 7 denotes a pentaprism that reflects light from the focusing plate 6 to the rear of the camera.

Reference numeral 8 denotes a focus plate 6 via a pentaprism 7
This is a photometry element for photometry of the upper image.

Reference numeral 9 denotes a first mirror for reflecting the light from the pentaprism 7 to the lower side of the camera. Reference numeral 10 denotes a rectangular second mirror for guiding the light from the first mirror 9 to the eyepiece. Movement is possible.

The second mirror 10 is formed with a protruding rotary shaft 10a for enabling rotation on both lower sides of a rectangular frame in which the second mirror 10 is fitted.
A wedge-shaped mirror hook 10b having an inclined surface on one side is provided toward the front of the mirror at the lower edge of the rectangular frame located in the middle of the frame.

Reference numeral 11 denotes an eyepiece fixed to the camera body 1.

Numeral 12 freely rotates between a blocking position where the second mirror 10 is brought into contact with the surface of the eyepiece lens 11 and a tilting position at an angle of 45 ° for guiding the light from the first mirror 9 to the eyepiece. This is an operating lever that can be slid in the left-right direction for moving.

The operating lever 12 has a wedge-shaped lever hook 12a having a side surface having an inclined surface in contact with the inclined surface of the mirror hook 10b in order to establish a rotating mechanism, and a lateral side of the lever hook 12a. Formed on the rotating lever 1
A lever claw 12b made of, for example, a leaf spring or the like is provided as an elastically deformable portion that is engaged with the engagement grooves 1b and 1c provided in the camera body 1 or the like by sliding the camera 2 in the left-right direction.

A turning mechanism for preventing stray light by an external operation of the operating lever 12 will be described with reference to FIGS.

The second mirror 10 has rotating shafts 10a provided on both side surfaces of a rectangular frame for enabling rotation, which are pivotally attached to the camera body 1 or the like.

Further, a stopper 1a for locking the rectangular frame portion of the second mirror 10 at the rear end of the second mirror 10 so as to always keep an angle for reflecting the optical path from the photographing lens system 2 to the eyepiece. Is provided, for example, on the camera body 1 or the like.
, One end of which is hung on the side surface of the second mirror 10, and the other end is hung on the camera body 1 side.

The effect of the mirror spring 13 also prevents rattling of the second mirror 10 itself during vibration.

As shown in FIG. 2, when the operating lever 12 is slid to the left by an external operation, the inclined surface of the mirror hook 10b provided on the second mirror 10 slides on the mirror while the inclined surface of the lever hook 12a slides. The hook 10b itself is pushed back to the front of the lever hook 12a, and the second mirror 10 is rotated to a vertical position where it comes into contact with the eyepiece lens 11 surface.

At this time, the engagement groove 1 provided in the camera body 1 or the like
The lever claw 12b provided on the operating lever 12 is dropped and locked at c.

The lever claw 12b can slide between the engaging grooves 1b and 1c by elastic deformation of the arm.

The second mirror 10 is rotated by this series of mechanisms, and accurate light measurement can be performed without the reverse light entering from the eyepiece affecting the light measuring element.

FIG. 3 shows a state after the rotation of the second mirror 10.

If the self-timer photographing is not performed and there is no influence of reverse light, the operation is performed in the reverse manner to the state shown in FIG. It can be used.

If the second mirror 10 is rotated to a position parallel to the eyepiece 14 as shown by the broken line in FIG. It goes without saying that the reflected light path into the camera is completely blocked.

Further, since the rotating mechanism is disposed immediately adjacent to the eyepiece, a compact rotating mechanism which can be easily linked with an external operating member without increasing the size of the camera head as in the conventional example can be realized. .

As described above, the reflecting member in the immediate vicinity of the eyepiece is:
When rotated by an external operation, the back-entering light from the eyepiece can bend the optical path immediately, preventing the back-entering light from entering, and the light from the imaging system is not reflected and does not diffuse into the camera, so stray light is blocked. Will be.

[0037]

As described above, according to the finder device of the present invention, in particular, in a finder device in which a reflecting member for bending an optical path is vertically arranged near an eyepiece, the finder is located in the vicinity of the eyepiece of the reflecting member. Since the reflection member is rotatable, it is possible to realize a finder that can prevent back light. According to the camera of the present invention,
Accurate photometry and distance measurement are enabled, and film exposure due to leakage of stray light that could not be prevented by the main mirror can be prevented.

[Brief description of the drawings]

FIG. 1 is a configuration diagram schematically showing a single-lens reflex camera according to a first embodiment of the present invention;

FIG. 2 is a perspective view showing a rotation mechanism according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing a rotation mechanism according to the first embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a single-lens reflex camera showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Camera main body 1a ... Stopper 1b ... Engagement groove 1c ... Engagement groove 2 ... Photographing lens system 3 ... Main mirror 4 ... Submirror 5 ... AF (automatic focus detection) module 6 ... Focus plate 7 ... Pentaprism 8 ... Photometric element 9 First mirror 10 Second mirror 10a Rotating axis 10b Mirror hook 11 Eyepiece 12 Operating lever 12a Lever hook 12b Lever claw 13 Mirror spring 14 Eyepiece

Claims (4)

[Claims] 1. A finder device in which a reflecting member for bending an optical path is vertically arranged near an eyepiece in opposition to one another, wherein, among the reflecting members, a reflecting member closest to the eyepiece is rotatable. apparatus. 2. The optical system according to claim 1, wherein the reflecting member in the immediate vicinity of the eyepiece is rotated to an optical path blocking position in contact with the eyepiece by sliding an operating lever by an external operation. Item 10. The finder device according to Item 1. 3. The finder device according to claim 1, further comprising a photometric unit for performing TTL photometry near the reflecting member above the eyepiece of the reflecting member. 4. A camera comprising the finder device according to claim 1.