JP2562091Y2 - Viewfinder structure of single-lens reflex camera - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a finder structure of a single-lens reflex camera, and more particularly to a finder structure of a single-lens reflex camera capable of changing a photographing screen size.

[0002]

2. Description of the Related Art In recent years, there has been provided a camera capable of changing a photographing screen size, for example, a so-called panoramic photographing camera in which a horizontal photographing angle of view is increased in a vertical direction. A single-lens reflex camera capable of taking a panoramic picture has been proposed. For example, a panoramic picture is obtained by trimming the top and bottom of a film taken using a wide-angle lens. In recent years, a panorama photograph can be obtained without performing trimming after photographing by attaching an adapter to an aperture for determining a photographing range provided on a film loading surface of the camera and making the aperture opening horizontally long. Some of them have been proposed.

[0003] In any case, in a single-lens reflex camera capable of normal photography and panoramic photography, when photographing a panoramic photograph, the vertical angle of view is limited in the viewfinder so as to correspond to the photographing range. It is necessary to display the field of view frame. For this reason, in this type of conventional camera, a horizontal field-of-view line is formed by engraving or the like above and below the focus glass, and this line is seen by refraction of light when looking through the viewfinder. In some cases, a photographing range is displayed.

[0004]

As described above, in the case where the view line indicating the panoramic photographing range is formed on the focus glass, the view line is viewed by refraction of light at the line forming portion. There is a problem that the line is thin and difficult to see. In particular, when the background of the subject has a substantially uniform brightness such as the sea or the sky, it is difficult to confirm the line of sight unless it is carefully observed. On the other hand, since the line is formed on the focus glass, the field of view line is always visible in the viewfinder, and the line exists within the angle of view during normal photographing, causing a problem that it becomes obstructive. SUMMARY OF THE INVENTION An object of the present invention is to provide a viewfinder structure that makes it easier to see a field of view frame that indicates a shooting range to be changed, but does not become obstructive during normal shooting.

[0005]

A finder structure according to the present invention is provided at a position along a focus glass, and a rack is provided at a part of the finder structure, and the operation lever is moved back and forth or left and right by an operation from outside the camera. A pinion meshed with the rack of the operation lever, an interlocking lever having a rack meshed with the pinion and moving back and forth in a direction opposite to the movement of the operation lever, and each of the operation lever and the interlocking lever A narrow rod-shaped field frame which is supported at one end and extends in the horizontal or vertical direction in the viewfinder, and is moved up and down or left and right in the viewfinder on the focus glass with movement of each lever. .

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a partially exploded perspective view of a main part of an embodiment in which the present invention is applied to a panoramic camera, FIG. 2 is a perspective view of a further main part in an assembled state, and FIG.
A quick return mirror 2 is built in a mirror box 1 of the single-lens reflex camera, and a focusing glass 3 is mounted thereon. Mirror box 1 on this focus glass 3
A prism sheet 4 having a rectangular frame shape substantially equal to the plane size of the above is fixed by screws 5, and the focus glass 3 is sandwiched between the mirror box 1 and a mask 6.
And a pentaprism 7.

On one side surface of the prism sheet 4, five screw holes 21 to 25, two, one, and two, from the upper side,
Two straight grooves 26 and 27 extending in the front-back direction are formed,
Pin screw 2 screwed into upper two screw holes 21 and 22
The operation lever 30 is movably supported in the front-rear direction by 8, 29, and the interlock lever 33 is movably supported in the front-rear direction by the pin screws 31, 32 screwed into the two lower screw holes 24, 25. doing. In this case, each lever 30,
33, slits 30a and 33a are formed in the front-rear direction, respectively.
By inserting 29, 31, and 32, each lever 30,
33 is movable in the front-rear direction. The operation lever 30 integrally has an operation piece 34 protruding upward. As shown in FIG. 4, the operation piece 34 protrudes from a slit 9 provided on the upper surface of the camera body 8 of the single-lens reflex camera. A switching knob 10 is integrally provided at the tip.

Also, a rack 35 is provided at the lower edge of the operation lever 30.
Are formed integrally, and a rack 36 is formed integrally with the upper edge of the interlocking lever 33. A pinion 37 is rotatably supported in the center screw hole 23 by a shaft screw 38, and this pinion 37 is connected to each of the levers 30, 33.
Of each of the racks 35 and 36. Further, at the lower ends of the operation lever 30 and the interlocking lever 33, two base ends of two thin frame-shaped viewing frames 39, 40 are supported at one end, respectively. , 27. These view frames 3
Reference numerals 9 and 40 denote fields of view indicating the photographing range during the panoramic photographing, which are formed to have dimensions substantially equal to the width of the prism sheet 4, and whose leading ends reach the other side surface of the prism sheet 4. I have.

On the lower surface of the other side surface of the prism sheet 4, a guide portion 41 having a length corresponding to the vertical angle of view when performing panoramic photographing is integrally provided in the front-rear direction. The front end and the rear end of the portion 41 are in contact with the front end portions of the visual field frames 39 and 40, respectively. In FIG. 4, reference numeral 11 denotes a lens, and reference numeral 12 denotes a release button.

According to this configuration, when the switching knob 10 protruding from the upper surface of the camera body is moved rearward along the slit 9, as shown in FIG. To rotate the pinion 37 clockwise through the rack 35. Therefore, the pinion 3
The interlocking lever 33 having the rack 36 meshed with 7 is moved forward. Therefore, the levers 30 and 33 are moved closer to each other, and the viewing frames 39 and 40 supported at the lower ends of the levers are positioned inside the linear grooves 26 and 27, respectively. By being in contact with both ends of 41, each visual field frame extends in the horizontal direction on the focus glass 3. Therefore, in this state, the field of view in the viewfinder is as shown in FIG.
Each of the visual field frames 39 and 40 appears in the horizontal direction at the vertical position, and these visual field frames indicate the photographing range at the time of panoramic photographing. Therefore, the panoramic shooting range can be clearly confirmed.

On the other hand, when the switching knob 10 is moved to the front along the slit 9, the operating lever 30 is moved to the front as shown in FIG. By the clockwise rotation, the rack 36 meshing therewith, that is, the interlock lever 33 is moved rearward. Therefore, the levers 30 and 33 are separated from each other, and the visual field frames 39 and 40 supported by the levers are separated from the linear grooves 26 and
27 are retracted to both sides of the focus glass 3. Accordingly, in this state, as shown in FIG. 6B, the field of view in the viewfinder does not show the respective view frames 39 and 40 in the viewfinder, and the view frames do not become obstructive in normal photographing.

Therefore, according to this finder structure, the shooting range of the panoramic photograph can be clearly confirmed by making the view frame advance into the finder at the time of panoramic shooting. On the other hand, by retracting the field of view frame outside the viewfinder during normal shooting, the field of view frame does not appear inside the viewfinder, and does not become an obstacle during shooting. At this time, each lever 30, 33
Is moved symmetrically back and forth, the field of view frame is moved forward and backward symmetrically with respect to the vertical center of the focus glass, and the shooting range during panoramic shooting can be defined vertically symmetrically with respect to the center of the finder. Even when the view frame is advanced into the viewfinder, the brightness of the view frame is not reduced by the view frame because the view frame has a thin line shape. Since there is no influence, the light measuring mechanism is not adversely affected. Furthermore, since the operation lever can be operated from outside the camera by the switching knob, the switching operation between panoramic imaging and normal imaging can be easily performed. In addition, since the visual field frames 39 and 40 are moved in the same plane, the space provided between the focus glass 3 and the pentaprism 7 can be reduced because the visual field frames are moved, which is advantageous for miniaturization of the camera.

Here, the present invention can be applied to a camera that uses an adapter for an aperture during panorama shooting or a camera that does not use an adapter. In addition, by exchanging the vertical position of the operation lever and the interlocking lever, it is possible to change the moving direction of the switching knob for normal shooting and panoramic shooting. Further, if the inner end of the linear groove is configured to regulate the advance position of the visual field frame, the guide portion provided on the prism sheet can be omitted. Furthermore, the present invention is configured such that the operation direction of the operation lever is changed to the left and right direction even for a camera that performs shooting by changing the full size to a half size or a camera that can shoot at an arbitrary size. By doing so, the same can be applied.

[0014]

As described above, the present invention has an operation lever which is operated to move back and forth or left and right, a pinion which meshes with a rack provided on the operation lever, and a rack which meshes with the pinion. It has an interlock lever that is moved in the opposite direction to the operation lever, and two view frames supported by each lever. At the same time, they are moved back and forth, and the operation of each of these levers makes it possible to move the field frame into and out of the viewfinder. Therefore, when taking a panoramic photograph, the photographing range can be checked by extending the visual field frame horizontally in the viewfinder up and down. On the other hand, during normal photographing, the visual field frame becomes obstructive by retracting the visual field frame. Can be prevented. In addition, the present invention has a simple configuration, is easily applied to an existing single-lens reflex camera, and can reduce the space for a field-of-view frame, which is advantageous for miniaturization of the camera.

[Brief description of the drawings]

FIG. 1 is a partially exploded perspective view of a main part of an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of FIG. 1 in an assembled state.

FIG. 3 is a sectional view of a main part in an assembled state in a front direction.

FIG. 4 is an external view of a camera.

FIG. 5A is a side view of a main part at the time of panoramic shooting, and FIG. 5B is a side view of the main part at the time of normal shooting.

FIG. 6A is a diagram illustrating the appearance of a viewfinder during panorama shooting, and FIG. 6B is a diagram illustrating the appearance of the viewfinder during normal shooting.

[Explanation of symbols]

3 Focus glass 4 Prism sheet 8 Camera body 10 Switching knob 30 Operation lever 33 Interlock lever 35, 36 Rack 37 Pinion 39, 40 Field of view frame

Claims (1)

(57) [Scope of request for utility model registration] 1. An operation lever provided at a position along a focus glass housed in a camera body, a rack is provided in a part thereof, and the operation lever is moved back and forth or left and right by an operation from outside the camera. A pinion meshed with the rack, an interlocking lever having a rack meshed with the pinion and moving back and forth or left and right in a direction opposite to the movement of the operation lever; and each of the operation lever and the interlocking lever A narrow bar-shaped field frame which is supported at one end and extends in the horizontal or vertical direction in the finder, and which moves up and down or left and right in the finder on the focus glass with movement of each lever. The viewfinder structure of a single-lens reflex camera.