JPH04174826A - Accessory of camera - Google Patents

Abstract

PURPOSE:To observe an object in the state there is no parallax by reflecting the beam from the object against an optical system for observation by means of a reflecting mirror positioned ahead a camera lens. CONSTITUTION:A reflecting mirror 1 is arranged at the same level of a camera lens 8a in the specified attitude and is opposed to the lens 8a by sliding a lens barrel 5 and a member 17 in the lateral and longitudinal directions respectively while seeing a lens 8 through an opening 5c. In the next step, since when an object is looked from the opening 5c with the mirror 1 arranged in the specified attitude, the beam radiated on the mirror 1 is reflected to a mirror 2 and is radiated in a lens and an eyepiece 4, parallax is eliminated, and the same image as photographing image can be observed.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a camera accessory in which a finder system optical path and a photographic lens system optical path are provided separately and in parallel.
In particular, the present invention relates to a camera accessory that allows viewing of the photographed screen without variation.

(Prior Art) Cameras having separate and independent optical paths for a finder system and a photographic lens system are widely used because they can be easily made compact and lightweight.

However, since this type of camera has a photographing lens and a viewfinder objective lens separately provided, there is a problem in that variation occurs as the photographing distance changes.

For this reason, many cameras of this type have marks for correcting balarax within the viewfinder field of view.
There are also cameras that shift the field of view by moving part of the finder system to accommodate close-up subjects.

(Problems to be Solved by the Invention) However, in the conventional example described above, there is a problem in that the relative relationship between the background and foreground of the subject and the subject differs between what is observed with the finder system and what is photographed.

The present invention has been made in view of the above-mentioned conventional problems, and it is an object of the present invention to provide a camera accessory that allows viewing of a photographic screen without any variation.

(Means for Solving the Problems) The invention according to claim 1 is a camera accessory that can be attached to and detached from a camera, and includes a reflecting mirror located in front of a photographing lens of the camera, and a light beam that receives a light beam reflected by the reflecting mirror. This camera accessory is characterized by having an observation optical system that produces an image that is easy to observe.

The invention according to claim 2 is the invention according to claim 1, which includes: a pedestal on which a camera is installed and fixed; a single reflecting mirror; an observation optical system that receives a light beam reflected by the reflecting mirror and forms an image that is easy to observe; The reflecting mirror is freely movable between a position in which a subject of the camera is reflected and a position in which a photographic lens of the camera is reflected, and is freely movable in a position in front of the photographic lens of the camera and a position in which it is retracted from in front of the photographic lens. a mirror that holds the reflective mirror, the reflective mirror support means, and the observation optical system and is slidably attached to the pedestal in a direction perpendicular to the optical axis of the photographing lens of the camera; A camera accessory characterized by having a tube.

(Function) In the invention of claim 1, the light flux from the object is reflected toward the observation optical system by the reflecting mirror located in front of the photographic lens, so that the object can be viewed by the observation optical system in a state without vararax. Observe.

According to the invention of claim 2, the single reflecting mirror is set in a posture for observing the photographing lens of the camera, and the lens barrel is slid on the pedestal,
The position of the reflecting mirror relative to the photographing lens is observed by the fR sensing optical system, and the position of the reflecting mirror and the photographing lens is aligned. Next, the reflecting mirror is set in a position to reflect the light flux from the subject, and the subject is observed by the MS optical system in a state without variax. Then, the reflecting mirror is retracted from in front of the photographic lens, and the camera takes a photograph.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a camera accessory 50 according to the first embodiment.
The reference numeral 6 in the figure shows the state in which the camera is attached to the camera 8.
indicates a pedestal, and on this pedestal 6.

A camera 8 is installed and fixed by screws 7.
A groove 6a is formed in the upper surface of the pedestal 6.

This groove 6a is arranged in front of the camera 8 and extends in a direction perpendicular to the optical axis of the photographing lens 8a of the camera 8. A finder system optical path 8b is provided above the photographic lens 8a.

Reference numeral 5 indicates a lens barrel, and a sliding fitting portion 5f formed on the lower surface of the lens barrel 5 is slidably fitted into a groove 6a, so that the lens barrel 5 can slide along the groove 6a. The lens barrel 5 is L-shaped, and has an opening 5 in a portion corresponding to the photographing lens 8a of the camera 8.
a and 5b are formed. An opening 5c is also formed at the rear end of the lens barrel 5.

A first reflecting mirror 1 is provided inside the lens barrel 5, and this first reflecting mirror 1 is arranged at a position corresponding to the openings 5a and 5b. Further, inside the lens barrel 5, a second reflecting mirror 2, a lens 3, and an eyepiece 4 are provided. The second reflection mirror 2 is arranged in the direction of reflection of the first reflection mirror 1, and the lens 3 and the eyepiece 4 are arranged in the direction of reflection of the second reflection mirror 2, respectively.

As shown in detail in FIG. 2, rectangular holes 5e extending in the vertical direction are formed in the side plates 5d on both sides of the lens barrel 5.
On both side surfaces 55 of this hole 5e, protrusions 5 extending in the vertical direction are provided.
6 is formed.

Reference numeral 17 indicates a sliding member attached to one side of the side plate 5d, and as shown in FIG. 3, recesses 17a are formed on both sides of the sliding member 17. This recess 17a
A leaf spring 18, which curves outward, is attached to the bottom surface of one side.

The convex strip 56 of the side plate 5d fits into the recess 17a, and the sliding member 17 can slide in the vertical direction.
A cross-shaped hole 17b is formed in the sliding member 17, which can be fixed at any position by applying pressure to the sliding member 6.

Reference numeral 16 indicates a support member, and the support member 16 has a front end 16a in the shape of a cross and a rear end 16b in the shape of a square prism. The tip end 16a of the support member 16 can fit into the hole 17b of the sliding member 17. On both sides of the first reflecting mirror 1,
A support shaft 51 is fixed, and this support shaft 51 is fixed to the support member 16.

In FIG. 2A, reference numeral 67 indicates a sliding member attached to the other side of the side plate 5d. This sliding member 67 has a circular hole 67b formed therein instead of the sliding member 17, and the other parts have the same structure as the sliding member 17. Therefore, parts having the same structure are given the same reference numerals as those of the sliding member 17.

The explanation will be omitted. The support shaft 51 is rotatably inserted into the round hole 67a of the sliding member 67, and the rear end portion 51a of the support shaft 51 protrudes by a certain length.

Pull out the tip 16a of the support member 16 from the hole 17b,
The supporting member is rotated by 90 degrees, and in this state, the tip 16a of the supporting member 16 is fitted into the hole 17b again to change the angle of the first reflecting mirror 1.

By the above operation, the first reflecting mirror 1 directs the reflecting surface 1a toward the opening 5b as shown in FIG.

As shown in FIG.
can be swung to a position in which the light beam is directed toward the opening 5a and the light flux entering from the opening 5a is reflected toward the second reflecting mirror 2. Moreover, when the sliding member 17 is located at the lower end of the hole 5e,
The first reflecting mirror 1 is positioned opposite the photographing lens 8a of the camera 8.

The accessory 50 includes a pedestal 6, a lens barrel 5, and a first reflecting mirror 1 provided on the lens barrel. Second
A reflective mirror 2, a lens 3, and an eyepiece 4 constitute an observation optical system.

Next, the photographing operation of the camera 8 using the accessory 50 will be explained.

The first reflecting mirror 1 is set at the same height as the photographing lens 8a of the camera 8, and the first reflecting mirror 1 is placed in the posture shown in FIG. While looking through the opening 5C and looking at the photographic lens 8,
By sliding the lens barrel 5 in the horizontal direction and sliding the sliding member 17 in the vertical direction, the first reflecting mirror 1 is moved into the photographing lens 8a.
to face.

Next, the first reflecting mirror 1 is set in the posture shown in FIG. 5, and the subject is observed by looking through the opening 5C.

That is, the luminous flux (the first
When the reflecting mirror 1 is retracted, the light beam incident on the photographing lens 8a is reflected by the first reflecting mirror 1 toward the second reflecting mirror 2.

Since the light enters the lens 3 and the eyepiece 4, there is no variation, and an image similar to the photographed image can be observed by looking through the aperture 5C.

Then, as shown in FIG. 6, the sliding member 17 is pushed upward to retract the first reflecting mirror 1 from the position facing the photographing lens 8a. Then, press the shutter to take a picture.

Note that in an autofocus camera, the lens barrel 5 may interfere with the focusing operation, so in such a case, the lens barrel 5 is slid to a state where it does not interfere with the focusing operation before photographing is performed.

FIG. 7 shows a state in which the camera accessory 0 according to the second embodiment is attached to the camera 8.

In the second embodiment, the same members as in the first embodiment are given the same reference numerals as in the first embodiment, and the explanation thereof will be omitted.

In the figure, reference numeral 63 indicates a lens barrel, and an opening 63a is formed in a portion of the lens barrel 63 corresponding to the photographing lens 8a of the camera 8.
, 63b are formed. An opening 63c is also formed at the upper end of the cocoon@63. A roof mirror 69 is provided inside the lens barrel 63, and this roof mirror 69 has an opening 6.
3a and 63b. Further, within the lens barrel 63, a lens 70, a lens 71, and an eyepiece 72 are provided. These lenses 70, lenses 7
1 and the eyepiece lens 72 constitute an observation optical system.

Support shafts 51 are fixed to both sides of the roof mirror 69, and the support shafts 51 are supported in the same manner as the structure shown in FIG.

The camera accessory 0 according to the second embodiment is also used in almost the same manner as the camera accessory 50 according to the first embodiment. That is, the operator looks through the opening 63c of the lens barrel 63 and positions the roof mirror 69 with respect to the photographic lens 8a. Rotate the roof mirror 69 90@. The light beam incident on the roof mirror 69 (in the state where the roof mirror 69 is retracted, the light beam incident on the photographic lens 8a) is reflected upward by the roof mirror 69, is imaged near the lens 71 by the lens 70, and is focused on the eyepiece lens 72. incident. Therefore, by looking through the opening 63c, it is possible to observe an image similar to a photographed image without variation.

(Effects of the Invention) As described above, according to the present invention, variation is eliminated and an image similar to the photographed image can be observed. Therefore, there is no difference between the observed image and the photographed image.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the camera accessory according to the first embodiment attached to the camera, and FIG. 2 is a support structure for the first reflecting mirror installed in the camera accessory according to the first embodiment. FIG. 2A is a perspective view showing the support structure of the first reflecting mirror, FIG. 3 is a perspective view of the sliding member constituting the support structure of FIG. 2, and FIGS. 4 and 5 are perspective views showing details. 1st
A diagram for explaining the operation for changing the posture of the reflecting mirror, FIG. 6 is a diagram for explaining the retracting operation of the first reflecting mirror, and FIG. 7 is a diagram for explaining the camera accessory according to the second embodiment. FIG. 50.60... Camera accessories... First reflecting mirror 51... Roof mirror 5.63... Lens barrel 2... Second reflecting mirror 3.7o, 71... Lens 4.72... ...Eyepiece 6...Pedestal 8...Camera sale δgen Sai 4gen sale diagram

Claims (1)

[Scope of Claims] 1. A camera accessory that can be attached to and detached from the camera, comprising a reflective mirror located in front of a photographic lens of the camera;
A camera accessory characterized by comprising an observation optical system that receives the light beam reflected by the reflection mirror and forms an image that is easy to observe. 2. In claim 1, a pedestal on which a camera is installed and fixed, a reflecting mirror, an observation optical system that receives the light flux reflected by the reflecting mirror and forms an image that is easy to observe, and the reflecting mirror is connected to the A reflection mirror support that is movable in a posture in which a subject of the camera is reflected and a posture in which a photographic lens of the camera is reflected, and that is movably supported in a position in front of the photographic lens of the camera and a position in which it is retracted from the front of the photographic lens of the camera. and a lens barrel that holds the reflective mirror, the reflective mirror support means, and the observation optical system and is slidably attached to the pedestal in a direction perpendicular to the optical axis of the photographic lens of the camera. Camera accessories featuring