JPH11167144A - Visual field frame changeover device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a visual field frame changeover device of a finder by which the reduction of a space for the moving range of a movable mask and a driving mechanism part is attained at the time of switching not only an APS (new photographic system) but also plural visual field frames. SOLUTION: Light shielding visual field frames 51-54 are split and turnably connected by connection pins 55a-55d at a part covering one side of a fixed visual field frame 11, and respective shading blades 51-54 are turnably installed by taking the centers of turn 51a-54a as a supporting point, so that changeover for H(wide) type, C(standard) type and P(panorama) type visual field frames as shown by (a), (b) and (c) is made possible only by moving one of the connection pins 55a-55d in the directions of arrows J1-J2 or the arrows K1-K2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a field-of-view frame switching apparatus, and more particularly to a viewfinder field-frame switching apparatus in a new photographic system having three types of screen formats.

[0002]

2. Description of the Related Art In recent years, a new photographic system (Advanced PhotoSystem, hereinafter abbreviated as "APS") which has been commercialized has three types of screen size formats for shooting, and a wide type (9:16 aspect ratio). Hereinafter, referred to as "H type"), a standard type having the same vertical dimension and shorter horizontal dimension as the H type (hereinafter referred to as "C type") having an aspect ratio of 2: 3, and having the same horizontal dimension as the H type and a vertical dimension. A panoramic type having a short dimension and an aspect ratio of 1: 3 (hereinafter, referred to as “P type”) can be selected.

When the screen size is selected by the user, it is general to switch the viewfinder field frame. A conventional field frame switching device is disclosed in, for example,
3826 or JP-A-8-146493. FIG. 1 schematically shows the switching operation of these field frames.
(A), (b) and (c) of FIGS.
The position of the field frame in the type, the C type, and the P type is shown.

[0004] In each of these, a fixed field frame 11 (shown by a broken line in the figure) and two L-shaped movable masks 12,
13 and a vertical width of the C type and the H type,
The widths of the H type and the P type are determined by the fixed field frame 11. Note that the hatched portions in the figure indicate the H type, C type, and P type screens.

According to FIG. 1, two movable masks 1 are provided.
2 and 13 move in parallel in the horizontal direction (arrow C direction) to determine the width of the C type, and move in the vertical direction (arrow P direction) to determine the vertical width of the P type. Further, according to FIG. 2, the two L-shaped movable masks 12 and 13 move obliquely in parallel (directions indicated by arrows C and P), respectively, and have a C-type width and
The vertical width of the P type is determined.

[0006]

However, when moving means are provided in the horizontal and vertical directions, the driving mechanism becomes complicated and a large space is required for the driving mechanism. Further, in the case of having the moving means in the oblique direction, the driving mechanism portion can be easily configured, but the moving range of the movable mask becomes large (see FIG. 2), which becomes an obstacle in designing a small camera. I was

SUMMARY OF THE INVENTION It is an object of the present invention to provide a finder field frame switching device which is not limited to the APS and saves the moving range of the movable mask and the space required for the drive mechanism when switching a plurality of field frames. I do.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a field frame switching device provided with a light-shielding blade capable of changing a substantial field frame by partially covering a rectangular fixed field frame. , Wherein at least one of the light-shielding blades is divided, and the divided light-shielding blades move in different directions.

According to this configuration, the two divided light-shielding vanes forming one side of the field of view have a position covering the normal photographing range in parallel with each side of the photographing range and a position retreating outside the normal photographing range. When the image is moved, the field frame is switched by being translated or rotated in different directions.

Further, in the present invention, the divided light-shielding blade is connected to the light-shielding blade adjacent to the light-shielding blade at right angles to the light-shielding blade by a flexible member.

According to this configuration, the two divided light-shielding vanes forming one side of the field of view move in the direction orthogonal to the side by driving a point on the movable mask in the direction orthogonal to the side. And move in different directions in a direction parallel to the side. At this time, the light-shielding blade adjacent to the light-shielding blade connected to the flexible member at a substantially right angle is moved in a direction parallel to the side to switch the field frame.

Further, according to the present invention, the divided light-shielding vanes rotate around different points.

According to this structure, the two divided light-shielding vanes forming one side of the field of view are rotated about a different point by substantially linearly driving or rotating one point on the movable mask. Switch the field frame.

Further, in the present invention, the light-shielding vane on one of the two opposite sides is moved in the same direction as the light-shielding blade on the other two opposite sides.

According to this configuration, the two divided light-shielding vanes forming one side of the visual field move in a direction substantially parallel to the side together with the adjacent light-shielding vanes that are substantially orthogonal to each other to switch the field frame.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of a camera according to the present invention is shown in FIGS. FIG. 3 is a diagram showing a cross section of the camera 1, and FIG. 4 is a perspective view.

The luminous flux from the subject entering the photographic lens system 2 is reflected by the quick return mirror 3 and forms an image on the reticle 4 during finder observation. A field frame switching unit 5 is disposed behind the optical path of the reticle 4, and the light passing through the field frame switching unit 5 is reflected by a pentagonal roof prism 6, reaches an eyepiece 7, and allows the user to check the subject image. Can be.

Further, the release button 1
When the button 4 is pressed, the quick return mirror 3 rotates, and the light beam from the subject advances toward the film 9, and the shutter 8 disposed in front of the film 9 is opened to take a picture. . The pentagonal roof prism 6 may use a pentagonal roof mirror.

A fixed field frame (not shown) is formed on the reticle 4 to determine an H type field frame. The field frame switching unit 5 is provided with a movable mask 12 having light shielding blades 10 capable of shielding in all directions, and the light shielding blades 10 are selectively moved by a field frame switching operation unit 15 so that P-type and C-type field frames are formed. It can be switched.

In the case of the APS, since the information written on the film 9 is printed on the photographic paper according to each screen size, it is not particularly necessary to shield the film 9 from light.
When switching between a standard screen and a panoramic screen in another 135 type system, for example, a mechanism for switching the screen size in front of or behind the shutter 8 is required. The present invention may be applied near such a shutter 8.

Next, with respect to the movable mask 12, a first embodiment of the present invention will be described with reference to FIG. In FIG.
(A), (b), and (c) show the positions of the light-shielding blades in H type, C type, and P type, respectively.

As shown in FIG. 5, the movable mask 12 has upper and lower movable masks 12a and 12b connected by two connecting portions 28 rotatably fixed to two slide shafts 26. The upper and lower movable masks 12a and 12b may be separately formed and connected by the connecting portion 28, or may be formed integrally. The slide shaft 26 is guided in the lateral direction in the figure by a slide guide groove 27, and can be moved in a direction away from each other and in a direction approaching each other by a drive mechanism described later.

The two opposing P light-shielding blades 21 have upper and lower divided C light-shielding blades 22a and 22b connected by an arm 23a, and the C light-shielding blades 22a and 22b are connected to a connecting portion 28 by an arm 23b. Have been. P shading blade 2
1 and C light-shielding blades 22a, 22b have stoppers 24, 2
5, a projection member 5 abuts on a fixing member (not shown) formed near the focusing screen 4 or on a member (not shown) for positioning the fixed visual field frame, and the P light-shielding blade 21 and the C light-shielding blade 22 are provided.
a and 22b are positioned.

The movable masks 12a and 12b are made of a flexible material.
The field frame restricting portions 29, 30 of the light-shielding blades 22a, 22b have rigidity to maintain linearity, and have arms 23a, 2b.
3b is shape-designed so that the direction can be freely changed. Further, the P light shielding blade 21 and the C light shielding blade 22a, 2
2b and the arms 23a and 23b may be formed of different materials, and only the arms 23a and 23b may be made of a flexible material.

In the movable mask 12 having such a configuration, as shown in FIG. 5A, when the H type is used, the slide shaft 26 is located substantially at the center of the slide guide groove 27, and
The light shielding blade 21 and the C light shielding blades 22a and 22b are outside the fixed visual field frame 11.

Next, as shown in FIG. 5B, when switching from the H type to the C type, the arms 23a,
The slide shaft 26 moves inward along the slide guide groove 27 so that the 3b is folded, the C light-shielding blades 22a and 22b move inward while moving in the vertical direction, and the stopper 25 moves the fixed visual field frame. 11 abuts a fixing member (not shown) formed near the end. Even if the slide shaft 26 is further moved inside the slide guide groove 27 by the stopper 25, the C light-shielding blades 22a and 22b are not moved only by changing the angle of the arm 23a.

At this time, the visual field frame restricting portions 30 of the C light shielding blades 22a and 22b are located on a straight line,
Move in the vertical direction away from each other by the C light shielding blades 22a and 22b and the arm 23b, and
And the C type field frame is determined.

Next, as shown in FIG. 5C, when switching from the H type to the P type, the arms 23a,
As the slide 23b is pulled, the slide shaft 26 moves outward along the slide guide groove 27, and the C light-shielding vanes 22a, 22b move outward so as to contract downward and upward, respectively. The P light-shielding blade 21 moves in the vertical direction, and abuts against a fixed member (not shown) formed near the end of the fixed field frame 11 by the stopper 24. At this time, the field frame regulating unit 29 of the P light shielding blade 21
Determines the P-type field frame.

When the movable mask 12 is made of a flexible material, as shown in FIG.
It is possible to configure without dividing b. FIG.
5 shows the case of the type, and the same members as those in FIG. 5 are denoted by the same reference numerals.

However, in the case of such a configuration,
When the arm 23 approaches parallel to the moving direction (arrow J) of the C light shielding blade 22, the C light shielding blade 22 and the arm 2
3, the stopper 23 of the P light-shielding blade is easily separated from the fixing member (not shown) in the direction of arrow K and becomes unstable because the joint 23c has elasticity.

Therefore, in FIG. 5 described above, by dividing the C light shielding blades 22a and 22b into upper and lower parts, the C light shielding blades 22a and 22b can move downward and upward in the figure, respectively. Arms 23a, 23b when type
Keeps a large angle with respect to the moving direction (arrow J) of the C light-shielding blade 22, so that the stopper 24 does not easily separate from the fixing member (not shown), and a stable and accurate field frame can be formed. As a result, the movement of the P light shielding blade 21 becomes smooth.

Further, as in the second embodiment shown in FIG.
By dividing only one C light shielding blade (22a, 22b),
The rigidity of the arms 23a and 23b is adjusted by the arm 23 or the joint 2
By configuring the rigidity to be higher than the rigidity of 3d, it is possible to make it difficult for the stopper 24 to separate from the fixing member (not shown).

As described in the first and second embodiments,
When the C light-shielding blades 22a and 22b are vertically divided, they can be moved in different directions, and the arms 23a and 23b are designed so that the directions can be freely changed.
By connecting to the P light-shielding blade 21 which is substantially perpendicular to the a and 22b, the connecting part 28 is moved only in the direction (arrow J direction) parallel to the field frame regulating part 29 of the P light-shielding blade 21 for stable and accurate operation. The screen can be switched between H type, C type and P type.

The same effect can be obtained by dividing the P light-shielding blade 21 and disposing the slide shaft 26 outside the P light-shielding blade 21 so as to move vertically in the drawing. is there. Furthermore, the field frame restricting portion 2 of the P light shielding blade 21
Since 9 is a straight line, a field frame other than H type, C type, and P type can be configured by providing another stop mechanism during switching from H type to P type.

The first embodiment and the second embodiment are shown in FIG.
It can be driven by a driving mechanism having the structure shown in FIG. 8A is a perspective view of the drive mechanism unit 40 in the H type, and FIGS. 8B and 8C are front views showing positions of respective members in the P type and the C type, respectively. The same members as those in FIG. 5 are denoted by the same reference numerals.

6A, the arm portion 23a of the movable mask 12 is rotatably fixed to a slide shaft 26, and the slide shaft 26 is guided by a slide guide groove 27 to restrict the field of view of the P light shielding blade 21. 29 can be moved substantially in parallel. Further, slide levers 41 and 42 are fixed to the slide shaft 26, and the slide levers 41 and 42 have long slide holes 41 a and 42 a and long operation holes 41.
b and 42b are bored.

A slide guide 43 is fitted in the slide slots 41a, 42a to position the slide levers 41, 42 in a direction perpendicular to the movable mask 12, and the operation slots 41b, 42b are operated. The bosses 45a and 45b protruding from the lever 44 are fitted, and the operation lever 44 rotates about the rotation center 44a, so that the slide levers 41 and 42 can move in the directions opposite to each other in the arrow J direction. ing.

According to such a configuration, the operation lever 44
Is disposed outside the camera body, and when the operation lever 44 is rotated to the position [P] of the display plate 46 by the user as shown in (b), the slide levers 41 and 42 are separated from each other and face each other. The distance between the C light-shielding blades 22a and 22b is increased, and the distance between the P light-shielding blades 21 is reduced, thereby forming a P-type screen.

When the operation lever 44 is rotated to the position [C] of the display plate 46 as shown in FIG. 4C, the slide levers 41 and 42 approach each other, and the opposing C light shielding blade 22
The distance between a and the opposing C light-shielding blade 22b is reduced to form a C-type screen. At this time, the P light-shielding blade 21 is retracted out of the fixed field frame 11.

Instead of operating the operation lever 44, the slide levers 41 and 4 are electrically driven using a motor and a cam.
It is also possible to drive 2 to switch the field of view. Further, the movable mask 12 of the second embodiment can be driven in the same manner.

As described above, since the three visual field frames can be switched only by the driving mechanism in one direction (the direction of the arrow J), the driving mechanism section 40 can be easily configured in a small space, and the camera can be saved in space. Can be achieved.

Next, a third embodiment will be described with reference to FIG. In FIG. 9, (a), (b) and (c) show the positions of the H type, C type and P type movable masks 12. The same members as those in FIG. 5 are denoted by the same reference numerals.

According to FIG. 9, one of the L-shaped opposing light-shielding blades 51, 53 is provided with pin guide grooves 55a to 55d, and the other opposing light-shielding blades 52, 54 is provided with connecting pins 56a to 55d. 56 d are protruded, and the four light shielding blades 51 to 54 are connected to the pin guide grooves 55 a by connecting pins 56 a to 56 d at substantially the center of each side of the fixed field frame 11.
Through 55d so as to be rotatable, and the center of rotation 51
a to 54a.

In the movable mask 12 having such a structure, when one of the connecting pins 55a to 55d is moved in the direction of the arrow J1-J2 or the arrow K1-K2, (b)
As shown in (c), the light shielding blades 51 to 54 rotate around the rotation centers 51a to 54a. Pin guide groove 55
a to 55d guide the other three connecting pins 56a to 56d and move them in a substantially straight line.
And 29a, 29b are positioned in a straight line to form an H type,
The field of view can be switched between C type and P type.

The light-shielding blades 51 and 52, and the light-shielding blades 53 and 5 are connected by the connecting pins 56b and 56d.
4 are connected to each other using a driving mechanism similar to the driving mechanism section 40 shown in FIG. It is possible to switch the frame, but the connection pin 5
When the light-shielding blades 51, 52, 53, and 54 are connected by 6b and 56d, the field frame can be switched simply by driving one of the connection pins 56a and 56c, and the drive mechanism can be further simplified. Is desirable.

Next, a fourth embodiment will be described with reference to FIGS.
This will be described with reference to FIG. In FIG. 10, (a),
(B) and (c) show the positions of the H type, C type and P type movable masks 12. FIG. 11 shows a driving mechanism 40 for driving the fourth embodiment shown in FIG. The same members as those in FIGS. 5 and 8 are denoted by the same reference numerals.

In FIG. 11, the movable mask 12 has a U-shaped P light-shielding blade 21 which is vertically connected and divided into right and left.
a, 21b and C light shielding blades 22c, 22d, and the P light shielding blade 21a and the C light shielding blade 22d
1, the P light shielding blade 21b and the C light shielding blade 2
2c is connected with another slide lever 42.

As in the case of FIG. 8, by rotating the operation lever 44, the slide levers 41 and 42 move in the directions opposite to the direction of the arrow J, thereby moving the movable mask 12.

According to such a configuration, in FIG. 10, the C light shielding blade 22c,
The 22d and the P light-shielding blades 21a and 21b can be moved in the same direction (arrow J) to switch the three visual field frames. Also, since there is no vertical movement in the figure, the field frame switching device can be configured with little consumption of the vertical space.

In this embodiment, the P light shielding blades 21a,
21b can be configured without being divided. However, the space for retracting one of the P light-shielding blades 21a and 21b having long blades out of the fixed visual field frame 11 and the moving distance of the P light-shielding blade (21a or 21b) in the direction of the arrow J are increased. Connected C shading vanes (2
Since the moving distance 2c or 22d) is also large, a large space is required. Therefore, the P light shielding blades 21a, 2
By dividing 1b left and right in the figure and moving them in opposite directions, the field frame switching device can be configured with a small space in the left and right directions.

Next, a fifth embodiment will be described with reference to FIG. In FIG. 12, (a), (b), (c)
Indicates the position of the H-type, C-type, and P-type movable masks 12.

In FIG. 12, the movable mask 12 has four light-shielding blades 61 to 64, and is rotatable integrally with rotating shafts 65 to 68. The four rotating shafts 65 to 68 and the driving shaft 70 are respectively connected to belts 69 as shown in FIG.
When the drive shaft 70 is rotated in the direction of the arrow E, the rotation shafts 65 to 68 and the light shielding blades 61 to 64 are linked by the arrow F1.
Through F4, it is possible to switch between C-type and P-type field frames as shown in (b) and (c).

Even in such a configuration, the light-shielding blades 61 to 64 are divided and rotated in different directions, so that the retreat space of the light-shielding blades 61 to 64 can be reduced, and only one point (drive shaft 70) is provided. It is only necessary to configure a drive mechanism for rotating the drive mechanism, and it is possible to save space in the drive mechanism section.

The above-described field frame switching apparatus has been described in the embodiment of the single-lens reflex camera. However, as shown in FIG. 13, even in the LS camera, the luminous flux from the subject that has entered the camera 1 from the light entrance 71 The field frame switching unit 5 may be arranged at a position where the image is formed, or the field frame switching unit 5 may be arranged on a secondary imaging plane in a camera using a relay lens system.

Further, the present invention is not limited to a camera, and can be used for switching a rectangular field frame in a slide projector or the like. In FIG. 13, reference numeral 72 denotes an objective lens, 73 denotes a Porro prism, and 7 denotes an eyepiece.

[0056]

According to the first aspect of the present invention, by dividing at least one side of the light shielding blade, when switching to a plurality of visual field frames, accurate and smooth switching, simplification of the driving mechanism and space saving are achieved. Can be achieved.

According to the second aspect of the present invention, a field frame switching device for accurately and smoothly switching to a plurality of field frames is provided.
This can be realized only by configuring a driving mechanism in the direction, so that space can be saved.

According to the third aspect of the present invention, it is possible to switch to a plurality of view frames simply by configuring a mechanism for driving one point in one direction, and it is possible to simplify the drive mechanism and save space. Becomes

According to the fourth aspect of the present invention, when switching to a plurality of visual field frames, there is almost no extra space in the direction orthogonal to the direction of movement of the light-shielding blade due to the drive mechanism in one direction, and in the direction of movement of the light-shielding blade. Can be configured in a small space.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a conventional switching position of a field frame.

FIG. 2 is a schematic view showing a conventional switching position of a field frame.

FIG. 3 is a sectional view of a camera according to the present invention.

FIG. 4 is a perspective view of a camera according to the present invention.

FIG. 5 is a plan view showing a field frame according to the first embodiment of the present invention.

FIG. 6 is a diagram illustrating the suitability of a field frame having a different configuration from the first embodiment according to the present invention.

FIG. 7 is a plan view showing a field frame according to a second embodiment of the present invention.

FIG. 8 is a diagram showing a method of driving a field frame according to the first and second embodiments of the present invention.

FIG. 9 is a plan view showing a field frame according to a third embodiment of the present invention.

FIG. 10 is a plan view showing a field frame according to a fourth embodiment of the present invention.

FIG. 11 is a diagram illustrating a driving method of a field frame according to a fourth embodiment of the present invention.

FIG. 12 is a plan view showing a field frame according to a fifth embodiment of the present invention.

FIG. 13 is a perspective view illustrating an arrangement of a field frame in an LS camera according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 camera 2 photographing lens system 5 field frame switching unit 10 light blocking blade 11 fixed field frame 12, 13 movable mask 21 P light blocking blade 22, 22a, 22b C light blocking blade 23, 23a, 23b arm 40 drive mechanism 41, 42 slide Lever 44 Operating lever 51, 52, 53, 54 Light shielding blade 61, 62, 63, 64 Light shielding blade

Claims (4)

[Claims] 1. A field frame switching device provided with a light shielding blade capable of changing a substantial field frame by partially covering a rectangular fixed field frame, wherein at least one side of the light shielding blade is divided and divided. A field frame switching device wherein the light shielding blades move in different directions. 2. The field frame switching device according to claim 1, wherein the divided light-shielding blade is connected to the light-shielding blade adjacent to the light-shielding blade at right angles to the light-shielding blade by a flexible member. . 3. The field frame switching device according to claim 1, wherein the divided light shielding vanes rotate around different points. 4. The field frame switch according to claim 1, wherein the divided light-shielding vanes on one of the two opposite sides move in the same direction as the light-shielding blades on the other two opposite sides. apparatus.