JPH0710733U - Viewfinder field switching device - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to easily switch the shooting screen size and the camera shooting status. [Configuration] When the switching lever 6 is in the off position, the main switch 13 is off, the upper and lower light shielding plates 2 and 3 covering the aperture 1a are fully opened to set the standard photographing screen size mode, and the cam groove 6e of the switching lever 6 is set. Thus, the upper and lower masks 10 and 11 cover the viewfinder field frame 9 to display the photographing disabled state, and when the operation lever 7 slides the switching lever 6 to the on position, the main switch 13 is turned on at the step 6g, The masks 10 and 11 are fully opened to open the viewfinder field frame 9, and the aperture 1a remains fully open to enter the normal shooting mode. When the switch lever 6 is set to the P position, the aperture 1a and the viewfinder field frame 9 are in the panoramic screen size mode. become.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a viewfinder visual field switching device that also switches the viewfinder visual field in conjunction with the switching of the photographing screen size of a camera.

[0002]

[Prior art]

 Conventionally, by moving the operating member on the outside of the camera, the shooting screen is switched from the normal size to the panoramic size, and the mask member is inserted into the viewfinder field to switch the field of view to the panoramic size. The mechanism is publicly known. In addition, most of recent cameras have been designed so that the camera can be switched between a shooting enabled state and a shooting disabled state by turning on / off the main switch.

Further, in the lens shutter camera in which the photographing optical system and the finder optical system are separated, the main switch is turned on / off by a member covering the finder so that the finder cannot be seen when the main switch is off. This camera is already on the market, and a transmissive liquid crystal display device is placed in the viewfinder, and when the main switch is turned off, the liquid crystal is set in the non-transmissive state. Means of displaying are also known.

[0004]

[Problems to be solved by the device]

 By the way, the above-mentioned conventional example has the following problems. (1) Since the main switch switching operation member and the screen size switching operation member are separate, the number of operation members increases, which complicates camera operation, and which screen size is displayed when the main switch is turned on. Since it is uncertain whether or not is set, it is easy for the photographer to make an accidental operation of taking a picture with an unintended screen size.

(2) Since the mechanism for displaying the camera non-operation in the finder when the main switch is turned off is provided separately from the finder visual field switching mechanism, the size of the camera is increased and the cost is increased. . (3) There is a proposal that the display of the main switch-off and the viewfinder field switching are performed by the same liquid crystal, but an expensive liquid crystal and liquid crystal driving means are required.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a viewfinder visual field switching device capable of preventing an erroneous operation due to a photographing screen size switching with a simple mechanism.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention has a main switch that switches between a shooting enabled state and a shooting disabled state, and switches the aperture size that defines the shooting screen by moving the operating member, and works in conjunction with it. In a camera having a screen size switching mechanism in which a mask member is inserted into the finder field to switch the finder field, the main switch and the screen size are switched by the same operating member.

Further, when the operation member is in the main switch-off state, at least a part of the mask member may be brought into the viewfinder field to display in the finder that photographing is impossible. . When the operation member is in the main switch-off state, the mask member may cover the finder field to indicate that the photographing is not possible.

[0009]

[Action]

 The viewfinder switching device with the above configuration switches the main switch of the camera on / off and the shooting screen with the same operating member, so when the main switch is turned on, it is not intended to set a standard screen size that is frequently used, for example. It is possible to reduce mistakes in shooting at the screen size. Also, when the main switch is off, the presence of the mask member in the finder field makes it possible to easily know that the camera cannot be photographed.

[0010]

【Example】

 Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a plan view showing a schematic configuration of this embodiment, FIGS. 2 and 3 are plan views during operation, and FIG. 4 is a configuration view of a finder optical system. In the figure, 1a is an aperture provided on a camera body (not shown) for defining a photographing screen, and 2 and 3 are upper and lower light-shielding plates which respectively enter the aperture 1a and block photographing light. The lower shading plate 3 is L-shaped and has vertically elongated holes 3a and 3b, which are guided by dowels 1b and 1c provided on the camera body, respectively, and are slidable vertically by a spring 4 so as to move downward. Being energized.

Reference numeral 5 denotes a T-shaped transmission lever, which is supported by the camera body so as to be rotatable around a shaft 5a, and dowels 5b, 5c, and 5d are provided at respective arm ends. The dowel 5b is rotatably connected to the middle portion of the light shield plate 2, and the dowel 5c is fitted into a left-right elongated hole 3c provided at the upper end of the light shield plate 3 so that the transmission lever 5 is When rotated clockwise by the spring 4, the light shield plate 2 slides downward and the light shield plate 3 slides upward, but it contacts the stopper 1d protruding from the camera body and holds the aperture 1a in the fully open state. And, the shooting screen is normal size. Further, the dowel 5d is provided at the arm end of the central portion of the transmission lever 5.

A switching lever 6 is held by the camera body so as to be slidable in the left-right direction. An operation knob 7 is fixed to the upper edge of the left end of the camera body, and V-grooves 6a, 6b and 6c are arranged in the lower edge. It is provided so that it can be engaged with the engaging portion 8a of the click spring 8 and is positioned at three positions determined by the V groove. Further, a protrusion 6d is provided at the center of the lower edge of the switching lever 6 and can come into contact with the dowel 5d of the transmission lever 5 within the lateral movement range thereof. Further, a V-shaped cam groove 6e is formed at the right end of the switching lever 6, and a step portion 6g having a sloped surface 6f is formed at the lower edge thereof so that the sloped surface 6f can come into contact with the main switch 12 which will be described later. Has become.

Reference numeral 9 is a finder field frame. Numerals 10 and 11 are masks that enter the finder field frame 9 to block the finder optical path. The masks are slidably supported by the camera body in the vertical direction and have racks 10a and 11a, respectively. It meshes with the gear 12 so as to move in the direction. A dowel 10b is provided on the lower end of the arm of the mask 10 so as to project therefrom. The dowel 10b is engaged with the cam groove 6e of the switching lever 6. Reference numeral 13 denotes a main switch, which is connected to a camera control circuit (not shown), and is turned on / off by the step portion 6g when the switching lever 6 is moved. When the switch is turned on, the camera is ready for shooting, and when it is turned off, the camera is turned on. The shutter release locks and the camera is unable to shoot.

The finder optical system in FIG. 4 is a real image type finder, and in the order from the front, 14 and 15 are objective lenses, 16 are field lenses, 17 are Porro prisms, and 18 is an eyepiece. The viewfinder masks 9 and 10 are disposed between the field lens 16 and the Porro prism 17, which enables the viewfinder field to be accurately determined.

In the present embodiment having the above-described structure, in FIG. 1, the V groove 6a of the switching lever 6 and the click spring 8 are engaged and held, and the index of the operation knob 7 indicates “OFF”. There is. Further, the projection 6d of the switching lever 6 is separated from the dowel 5d of the transmission lever 5, the transmission lever 5 is biased counterclockwise by the spring 4 and held in contact with the stopper 1d, and the light shielding plates 2 and 3 are It is retracted from the aperture 1a.

Further, the slope 6f at the right end of the switching lever 6 is separated from the tip of the main switch 13, the main switch 13 is in the OFF state, and the camera control circuit locks the camera to release the image. It is in a state. The dowel 10b of the mask 10 of the finder is guided by the cam groove 6e, the mask 10 is held at the uppermost position, and the mask 11 interlocking with the mask 10 is held at the lowermost position. The field frame 9 is completely covered by the mask 10.11 so that the photographer cannot see anything even when looking through the viewfinder. This allows the photographer to know that the main switch 13 is off even when looking through the viewfinder.

When the operation knob 7 is moved to the right from this state so as to be aligned with the “ON” index, the state shown in FIG. 2 is obtained. Then, the V groove 6b of the switching lever 6 is engaged with and retained by the click spring 8, and the projection 6d does not yet come into contact with the dowel 5d of the transmission lever 5, so that the light shielding plates 2 and 3 remain retracted from the aperture 1a. And the normal screen size is in shooting mode. Further, the slope 6f at the right end of the switching lever 6 is brought into contact with the tip of the main switch 13 to be displaced and the stepped portion 6g holds the main switch 13 in the ON state, and the camera is ready to shoot. Further, the mask 10 is held at the lowermost end by the cam groove 6e, the masks 10 and 11 are completely retracted from the viewfinder field frame 9, and the viewfinder field corresponds to a normal photographing screen size.

From this state, when the operation knob 7 is further moved to the right to match the index of “P”, the state shown in FIG. 3 is obtained. Then, the V groove 6c of the switching lever 6 is engaged and held with the click rod 8, the projection 6d abuts against the dowel 5d of the transmission lever 5, and the transmission lever 5 resists the urging force of the spring 4 to move the timepiece. Is rotating in the direction. Therefore, the shading plate 2 connected to the dowel 5b of the transmission lever 5 moves downward, the shading plate 3 connected to the dowel 5c moves upward, and the shading plates 2 and 3 enter into the aperture 1a to move a predetermined image. It is held at the position where the surface size is formed, and the so-called panoramic shooting mode is set. Then, since the main switch 13 is still held in the ON state by the step portion 6g, the camera is ready for shooting.

In this embodiment, the main switch 13 is kept in the ON state while the switching lever 6 moves from “ON” to “P”, but from “ON” to “P”. In the middle of switching, the main switch 13 is turned off by making a cut in the step portion 6g of the switch lever 6, and the main switch 13 is turned on only when the switch lever 6 is held in the "ON" position or the "P" position. You may do it.

On the other hand, the mask 10 of the finder is held at a predetermined position by the cam groove 6e, and the mask 11 is also held at the predetermined position in conjunction with this, so that the upper part and the lower part of the finder field frame 9 are partially shielded. The viewfinder field corresponds to the panoramic shooting screen size, and the photographer can check the shooting range in the viewfinder.

5 to 7 show a second embodiment of the present invention. To simplify the description, the same parts as those in the first embodiment are designated by the same reference numerals, and only different points will be described. In this embodiment, the mask 20 is provided with a "OFF" character 20a at its lower edge so as to transmit light, and a dowel 20b provided at the lower end of its arm is guided by the cam groove 6e of the switching lever 6 to move up and down. When the mask 21 is moved, the dowel 21a provided at the lower end of the arm of the mask 21 is guided by being engaged with the cam groove 6h formed above the cam groove 6e of the switching lever 6 and moved up and down. Has become. The other structure is similar to that of the first embodiment.

In the present embodiment having the above-described structure, FIG. 5 shows the main switch 13 in the “OFF” state, in which the mask 20 is positioned at the uppermost position by the cam groove 6e and is approximately half the viewfinder frame 9. The "OFF" character 20a has entered the viewfinder field, and the "OFF" character 20a can be read when the photographer looks into the viewfinder. The mask 21 is held at a position retracted from the finder field frame 9.

FIG. 6 shows the main switch 13 in the “ON” state (normal shooting screen size), the mask 20 is guided by the cam groove 6 e and retracts from the viewfinder field frame 9, and the mask 21 is also removed from the viewfinder field frame 9. It remains held in the retracted position.

FIG. 7 shows the main switch 13 in the “P” state (panoramic shooting mode). The mask 20 is guided by the cam groove 6e, and the mask 21 is guided by the cam groove 6h. It enters and is held at a position that forms a viewfinder field corresponding to the panoramic shooting screen. At this time, the “OFF” character 20 a of the mask 20 is located outside the finder field frame 9. In this embodiment, the viewfinder cannot be completely covered in the "OFF" state, but it is possible to let the photographer recognize the "OFF" state, and the width of the mask 21 above the viewfinder field is reduced. This is possible even when the space above the viewfinder is small due to the miniaturization of the camera.

[0025]

[Effect of device]

 As described above, the present invention makes it possible to operate the switching of the main switch and the switching of the shooting screen size with the same operating member, and when the main switch is off, the mask member for switching the viewfinder field in conjunction with the switching of the screen size is used. By entering at least a part or all of the viewfinder into the viewfinder to indicate to the photographer that photography is not possible, the screen size can be switched easily and reliably, and must be used when the main switch is turned on. Since the standard screen size mode with high frequency can be set, it is possible to reduce the possibility of erroneous operation when shooting with an unintended screen size. Furthermore, when the main switch is turned off, it is possible to display in the viewfinder field that shooting is impossible with a simple mechanism.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a finder visual field switching device according to a first embodiment of the present invention, showing its main switch-off state.

FIG. 2 is a plan view of the main switch on state (standard shooting screen size mode).

FIG. 3 is a plan view of the state of the main switch P (panoramic shooting mode).

FIG. 4 is a sectional view of the finder optical system.

FIG. 5 is a schematic plan view of the finder visual field switching device according to the second embodiment of the present invention, showing its main switch-off state.

FIG. 6 is a plan view of the main switch on state (standard shooting screen size mode).

FIG. 7 is a plan view of the main switch P state (panoramic shooting mode).

[Explanation of symbols]

1a ... Aperture, 1b, 1c ... Dowel, 1d ...
Stoppers, 2, 3 ... Shading plates, 4 ... Spring, 5 ... Transmission lever, 6 ... Switching lever, 6e, 6h ... Cam groove,
6g ... Step, 7 ... Operating knob, 8 ... Click spring, 9 ... Viewfinder field frame 10, 11, 20, 2
1 ... Mask, 10a, 11a ... Rack, 10b ...
Dowel, 12 ... Gear, 13 ... Main switch, 14,
15 ... Objective lens, 16 ... Field lens, 17
..Porro prisms, 18 ... Eyepieces, 20b, 21
a ... Dowel.

Claims (3)

[Scope of utility model registration request] 1. A main switch for switching between a shooting enabled state and a shooting disabled state, the aperture size defining a shooting screen is switched by the movement of an operating member, and the mask member is moved into the viewfinder field in conjunction therewith. In a camera having a screen size switching mechanism for switching the viewfinder field, the viewfinder field switching device is characterized in that the main switch and the screen size are switched by the same operating member. 2. When the operation member is in the main switch-off state, at least a part of the mask member is made to enter the viewfinder field to display in the viewfinder that the photographing is impossible. Item 1. A viewfinder field switching device according to item 1. 3. The viewfinder field according to claim 2, wherein when the main switch of the operation member is turned off, the mask member covers the viewfinder field to indicate that the shooting is not possible. Switching device.