JPH0743829A - Camera - Google Patents

Abstract

PURPOSE:To provide a camera improved on such a situation that the image plane of a finder becomes a standard image plane though a photographic image plane is set as a panoramic image plane when a failure occurs in an angle-of- view changing mechanism and a photograph on which the face of a person being a subject is not photographed is taken when a camera user takes the photograph as the standard image plane in the camera capable of taking the photographs as the standard image plane and the panoramic image plane. CONSTITUTION:This camera is provided with an energizing means always energizing a panoramic visual field frame 8 to a position shown in a figure from the right side of the figure so that the visual field aperture 12c (standard image plane) of a visual field mask 12 constituting the finder visual field frame may be shielded by the panoramic visual field frame 8; and the image plane of the finder is automatically set to the panoramic image plane when the failure occurs in the angle-of-view changing mechanism. Therefore, trouble that the photograph composed in a standard image plane size is taken though the photographic image plane is a panoramic size is not caused.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera capable of switching the angle of view, which is equipped with a safety mechanism capable of preventing undesired photography due to a mismatch in the angle of view between the finder system and the photographing system.

[0002]

2. Description of the Related Art Conventionally, a camera capable of switching the angle of view of this type is
The movable blades or masks of both the photographing system and the finder system are interlocked with the movement of the operation member arranged outside the camera so that the angle of view of both is switched at the same time.

[0003]

However, in the above-mentioned conventional example, when a plurality of interlocking members are interposed due to space restrictions from the operation member arranged outside the camera to the blade member or the mask for controlling the angle of view. There is a possibility that the frictional resistance will increase due to temperature changes and that the blade member or mask will stop halfway due to factors such as wear debris getting caught, and the angle of view between the viewfinder system and the shooting system will not match. There was a drawback.

In this case, especially when the angle of view of the finder optical system is wider than that of the photographing optical system, a serious accident occurs in which a part of the object originally intended to be taken on the finder is cut off. There was a possibility of doing. That is, when a person is photographed, there is no room for relief even if the entire person is displayed on the screen in the viewfinder, and the face or leg is cut in the actual photograph.

An object of the present invention is to provide a camera having a safety mechanism for preventing the above-mentioned accident.

[0006]

[Means for Solving the Problems] In order to prevent a wide-field-of-view image from being shot when the image-viewing screen is on the side of a narrow angle of view, in order to prevent the view-angle changing interlocking mechanism from failing, a viewfinder is used. A method of automatically changing the screen to the narrow angle side is also a solution to the above-mentioned problem. The invention provides a camera with a safety mechanism constructed according to this solution.

The camera according to the present invention is characterized by being provided with a biasing member for constantly biasing the field frame of the viewfinder screen toward the narrow angle of view.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment> FIGS. 1 to 7 show a first embodiment of the present invention.

In FIGS. 3 to 7, reference numeral 1 is a finder base plate for holding and fixing each member constituting the finder, and 2 is a cam provided on a lens barrel (not shown), which is interlocked with the operation of the zoom lens of the photographing system. Objective lens of the first group, 3
Similarly to the lens 2, a and 3b are objective lenses of the second group which are interlocked with the operation of the zoom lens of the photographing system by a cam provided in a lens barrel (not shown), and 4 are objective lenses 2 and 3a and 3
It is a plane mirror for horizontally reversing the image through b. Reference numeral 5 is a field lens, and the plane side is an image forming surface of the finder image. Reference numeral 6 is a Porro prism with three-sided reflection for inverting an object image, and 7 is an eyepiece lens. Reference numeral 8 denotes a panoramic field frame which is arranged between the field lens 5 and the Porro prism 6 and is movable in the vertical direction of the paper in FIGS. 4 and 5, and 8a is an engagement provided on the lower surface of the panoramic field frame 8. It is a department. Reference numeral 9 is a transmission lever for moving the panoramic field frame 8 and moves the panoramic field frame 8 via the engaging portion 9a. Further, the transmission lever 9 has an engaging portion 9
A shaft portion 9b serving as a rotation center of the lever 9 is provided on the other end side of a, and the movement of the lever 9 is restricted by fitting the shaft portion 9b into the hole portion 1a provided in the finder base plate 1.

A switching lever 10 is arranged on the lower surface of the finder base plate 1, and is held and fixed by press-fitting the shaft portion 9c of the transmission lever. Further, the engaging portion between the transmission lever 9 and the switching lever 10 is D-cut so that the positional relationship between the parts is always the same. Further, the switching lever 10 has a return spring 11
It is urged in the counterclockwise direction by and is in a state as shown in FIG. 4 when not in operation.

A field mask 12 is held in close contact with the flat image forming surface of the field lens 5. Visual field mask 12
3 is formed in a U shape surrounding the field lens 5 as shown in FIG. 3, and the lower portion 12a of the U shape portion serves as a lid for the space 1d in the finder base plate 1 (movable space of the transmission lever 9). The lower portion plays a role of preventing dust and dirt from entering the space from above. Further, as shown in FIGS. 6 and 7, the prism cover 13 covers the field lens 5, the Porro prism 6 and the visual field mask 12 to prevent foreign matter from entering these members. Reference numeral 14 denotes a panorama switching button for switching the screen size to the panorama size from outside the camera.
When is operated, the viewfinder field range is switched to the panoramic size as shown in FIG. 1, and at the same time, the screen of the photographing system is switched to the panoramic size as shown in FIG.

FIG. 6 and FIG. 7 show a mechanism for switching the screen size of the photographing system in conjunction with the operation of the switching button 14. Reference numeral 15 denotes a ring member that is rotatably guided around the photographing optical axis of the camera. Reference numerals 16 and 17 denote blade members whose movements are restricted so that they can be moved only in the vertical direction with respect to the camera body. The ring members 15 are formed by engaging portions 16a and 17a formed on the blade members 16 and 17, respectively.
Is converted into vertical movement of the blade member.

FIGS. 1 and 2 show changes in the viewfinder screen, showing the positional relationship of the movable panoramic visual field frame 8 with respect to the fixed visual field mask 12. FIG. 1 shows the panoramic state. 2 shows a full size state.

FIGS. 4, 6 and 1 show a state in which the panorama switching button 14 is switched to the panorama side. In the state of FIG. 4, the switching lever 10 is biased in the clockwise direction by the return spring 11, the transmission lever 9 operating integrally therewith also rotates in the clockwise direction, and further, via the engaging portion 9a of the transmission lever 9. As shown in FIG. 1, the panoramic field frame 8 slides between the Porro prism 6 and the lead side portion 12b of the field mask 12 to cover the field openings 12c of the field mask 12 above and below, and a standard screen size finder screen. To the panorama screen P.

The engaging portion 8a of the panoramic field frame 8 is shown in FIG.
As shown in FIG. 2, the finder main plate 1 comes in contact with the positioning surface 1b to stop at a predetermined position, and is held by the return spring 11 so as not to rattle.

On the other hand, in the photographing system, as shown in FIG. 6, the ring member 15 is rotated clockwise through the engagement dowel 14b provided on the panorama switching button 14, and the engagement provided on the blade members 16 and 17 is performed. The rotation of the ring member 15 is transmitted to the blade members 16 and 17 via the dowels 16a and 17a. As a result, the blade member 16 is moved downward and the blade member 17 is moved upward, respectively, and as a result, the photographing screen of the standard screen size shown by the chain double-dashed line in FIG. Change the size to the panorama screen size.

Needless to say, the angle of view of the finder and the angle of view of the photographing screen correspond to each other. Next, the related structure and function of the return spring 11 which constitutes the safety mechanism which is the gist of the present invention will be described. As shown in FIG. 4, the return spring 11 is composed of a torsion spring (torsion spring) in this embodiment, and one of the dowels 1 is provided on the finder base plate 1.
C, the other side is hooked on the switching lever 10, and the switching lever 1
0 is always urged clockwise in FIG. Another role of the spring 11 is to urge the panoramic field frame 8 to always be positioned on the panoramic side (to the left in FIG. 2) and to hold the panoramic field frame 8 at a predetermined position without rattling. That is.

In the camera of the present invention, since the spring 11 urges the panoramic field frame 8 to the left side in FIG. 2 (that is, the viewfinder screen becomes the panoramic screen) via the transmission lever 9, the photographing is performed. Even if there is a malfunction in the interlocking mechanism that links the screen and viewfinder screen, the photographer does not notice it and shoots at the standard screen size to take a photograph of a person's face or foot. It is possible to prevent accidents that occur. That is, when the finder interlocking portion 14a of the panorama switching button 14 is damaged due to some factor (for example, an excessive force is applied from the outside), the finder system and the photographing system may not be accurately interlocked with each other. At that time, in the camera of the present invention, the panoramic field frame 8 is moved to the left side in FIG. 2 by the spring 11, so that the view angle of the viewfinder changes to the narrow view angle side, that is, the panorama side. Will be recognized as being set to the panorama screen, and as a result,
Only when the screen of the photographing system is the standard screen or the panoramic screen, only the panoramic photograph can be taken. That is, in the camera of the present invention, when the panorama switching mechanism fails, the viewfinder side is always switched to the panorama side field of view frame, so that at that time the photographer can be prevented from taking a picture of the standard screen size. As a result, it is possible to prevent a photograph such as a face cut or a leg cut of the subject person from being generated. In the embodiment, the torsion spring is used as the urging member for urging the panoramic visual field frame 8, but the urging member is not limited to the torsion spring, and may be a tension coil spring or a toggle spring, or Rubber, a leaf spring, or the like may be used, and any material may be used as long as it generates a force in a direction that biases the panoramic field frame 8 toward the narrow field angle side. Further, in the above-described embodiment, the panoramic screen is mainly described as the narrow view angle side screen, but the screen is not necessarily limited to this screen and, for example, a high-definition size (16: 9) may be used instead of the panoramic screen. Good. Even in this case, the field frame member may be always biased from the standard screen position toward the narrow field angle side.

The position at which the biasing member is provided does not have to be limited to that in the above embodiment, and the present invention is not restricted in what form and at what position it is provided.

<Second Embodiment> FIGS. 8 to 11 show a second embodiment of the present invention.

In the figure, the parts indicated by the same numbers as those in FIGS. 1 to 7 are the same parts as those in the first embodiment, and the description of these same parts will be omitted unless necessary. 2
Reference numeral 1 is a panorama switching button, and 22 is a switching lever.

The present embodiment is characterized by adding a forced return mechanism that functions when the panoramic field frame 8 malfunctions. The details will be described below.

As shown in FIGS. 8 to 10, the panorama switching button 21 has a return claw portion 21a of the switching lever 22 as compared with the panorama switching button 14 of the first embodiment.
Further, the switching lever 22 is provided with a protruding portion 22a on the lower surface side (back side of the drawing).

FIG. 8 shows a panoramic state. The panorama switching button 21 is held in the illustrated state moved to the right by a lock member (not shown). On the other hand, the panoramic field frame 8 of the finder is moved by the return spring 11 to the switching lever 22.
1, and the transmission lever 9 is arranged so as to regulate the vertical direction of the visual field opening 12c of the visual field mask 12 as shown in FIG. When each part is functioning normally, as shown in FIG. 8, the claw portion 2 provided on the panorama switching button 21.
1a does not engage with the protrusion 22a of the switching lever 22.

FIG. 9 shows a standard screen (non-panoramic screen) state. The panorama switching button 21 is moved to the left from the position shown in FIG. 8 by a spring member (not shown), positioned by a stopper (not shown), and held in the state shown. On the other hand, on the finder side, the switching lever 22 and the transmission lever 9 are rotated in the counterclockwise direction against the force of the return spring 11 by the panorama switching button 21, and the panoramic field frame 8 is covered by the field mask as shown in FIG. 12 field openings 12c
It is held in a state of being evacuated to the outside. Even in this state, the claw portion 21a provided on the panorama switching button 21 does not engage with the protrusion 22a of the switching lever 22. Thus, the parts (21a and 2) added to the first embodiment are added.
2a) has a positional relationship such that it does not come into contact at all when the panorama switching mechanism is functioning normally.

FIG. 10 shows the movement of the panoramic visual field frame 8 due to an increase in frictional resistance of each lever portion and a sliding portion of the panoramic visual field frame due to a change in temperature, humidity, or the like, or a wear piece being caught in the sliding portion. When the required force is larger than the force of the return spring 11, that is, a state in which an accident occurs in which the panoramic view frame 8 does not interlock with the movement of the panorama switching button 21 is shown. In this case, the positions of the panoramic field frame 8, the transmission lever 9 and the switching lever 22 are the same as those in the state of FIG. 9, even though the panorama switching button 21 has moved leftward from the position of FIG. When the claw portion 21a of the panorama switching button 21, which is the operating member, is in contact with the protrusion 22a of the switching lever 22 (FIG. 10), the panorama switching button 21 is further moved to the right. 21a forcibly pushes the protrusion 22a of the switching lever 22. In conjunction with this operation, the switching lever 22 and the transmission lever 9 rotate clockwise, the panoramic field frame 8 moves upward (to the right in FIG. 2) to some extent in FIG.
It is stopped with a part of the panoramic field frame 8 partially entering c (see FIG. 11).

In this state, the photographer can recognize that "the current photographing screen is in a panoramic state, but the visual field frame 8 is caught on the way for some reason." By doing so, it is possible to avoid the worst situation of accidentally shooting the standard screen. Note that, as shown in the above-described embodiment, the operation caused by the contact between the claw portion 21a of the panorama switching button and the projection 22a of the switching lever 22 is an operation that occurs only when the original panorama switching operation does not work. In order to configure the safety mechanism for causing the claw 21a and the protrusion 22a to perform the operation, the dimensional relationship between the button and the lever 22 has a shape that does not interfere with normal operation, including manufacturing tolerances.
Therefore, conversely, the original movement is not restricted by the movement of this safety mechanism. In this embodiment, the movement of the panorama switching button 21 is transmitted to the panoramic visual field frame 8 via the switching lever 22 transmission lever 9, but the present invention is not necessarily limited to this form, and ideally the panorama switching is performed. It is desirable that the mechanism be such that the movement of the button is directly transmitted to the panoramic field frame 8.

<Third Embodiment> FIGS. 12 to 15 show a third embodiment of the present invention.

In the figure, parts designated by the same reference numerals as those in FIGS. 1 to 7 are the same parts as those in the first embodiment. Reference numeral 31 is a detection switch for detecting the position of the panoramic field frame 8 of the finder, and 32 is a detection switch for detecting the position of the ring member 33 that drives the panoramic blades of the photographing system.

The operation will be described below with reference to the drawings.

12 and 14 show the case where the viewfinder screen and the photographing screen are in the panoramic state.

As shown in FIG. 12, when the panoramic field frame 8 is in the panoramic state, the detection switch 3 is provided on the side surface of the frame 8.
The switch 31 is in the ON state when 1 touches. Further, in the photographing system, the switch 32 is in the ON state by the bent portion 33a of the ring member 33 and the detection switch 32 contacting each other.

13 and 15 show the case where the viewfinder screen and the photographing screen are standard screens. As shown in FIG. 13, the detection switch 31 falls into the angle-of-view restriction portion of the panoramic field frame 8 and the switch 31 is turned off. At this time, if the view angle regulating portion of the frame 8 remains in the opening 12c of the view mask 12 of the viewfinder, the switch 31 is turned on, and the view angle regulating portion of the frame 8 is completely covered by the view mask. The switch 31 is turned off in the state of being retracted from the opening 12c.

On the other hand, as shown in FIG. 15, in the photographing system, the switch 32 is in the OFF state because the notch 33b of the ring member 33 is located at the position of the contact piece of the switch 32.

In the apparatus of this embodiment, both the switch 31 and the switch 32 are turned on, or both switches are turned off.
If it is F, it is determined that the mechanical parts are normally interlocked, and if one of both switches is ON and the other is OFF, it means that there is an abnormality in the interlocking mechanism of either the finder system or the imaging system. If it is determined that the states of both switches do not match, a warning is issued to the camera user. As the warning method, for example, an optical display section such as LEO may be blinked on the finder display section, or a buzzer may be used to notify by sound. In addition, the release lock may be automatically applied to prevent bad photography.

In this embodiment, an example has been described in which the case where the outputs of both detection switches are different is judged to be an abnormal state and a warning is given, but the case of issuing a warning need not be limited to the case of the above-mentioned embodiment, and for example, As in the first and second embodiments, a warning (display sound) may be issued or a release lock may be set only when the viewfinder view angle is wider than the shooting system view angle.

[0038]

As described above, according to the camera of the present invention, the following effects can be obtained.

(I) Since the view angle control member of the viewfinder is always biased toward the narrow view angle side, even if the view angle switching operation knob cannot be accurately linked to the viewfinder system due to an unexpected accident, the photographer cannot Is framed by the viewfinder image on the narrow angle side, so it can be corrected to the photographer's intention at the printing stage. Further, since the elastic member is used for biasing, it is possible to hold the angle-of-view restricting member in a state of forming a narrow angle of view without play.

(Ii) By providing a second forcible returning mechanism to the narrow angle side that functions when the angle of view restricting member of the finder does not operate normally, frictional resistance of the mechanism due to temperature and humidity changes It has become possible to prevent malfunctions due to malfunctions and attachment of wear debris, and also allow the photographer to recognize a halfway stop.

(Iii) A switch is provided for detecting whether or not the view angle regulating member of the finder and the view angle regulating member on the photographing screen side are interlocked, and the interlocking of both members is detected by the signal of the switch, If the two members are not linked, the warning means is used to warn the photographer, or the release lock is automatically set, so that the standard screen is displayed even though the shooting screen is in panoramic size. It is possible to prevent accidents that the user mistakenly recognizes and shoots.

[Brief description of drawings]

FIG. 1 is a diagram showing a state of a finder screen of a camera of the present invention, showing a state in which the finder screen is a panoramic screen (a narrow view angle screen).

FIG. 2 is a diagram showing a state in which a finder screen of the camera of the present invention is a standard screen.

FIG. 3 is an exploded perspective view of essential parts of the finder device of the camera of the present invention.

FIG. 4 is a view showing a horizontal sectional view of a main part of a finder device of a camera of the present invention and a view angle switching button of the camera,
The figure which shows the state in which the screen is set to the narrow-angle screen.

FIG. 5 is a horizontal sectional view of the finder device, showing a state in which the screen is set to the standard screen.

FIG. 6 is a vertical sectional view of the viewfinder device of the camera of the first embodiment of the present invention and a front view of the view angle changing means of the shooting screen, showing a state where the shooting screen is set to the narrow view angle screen. .

FIG. 7 is a diagram similar to FIG. 6, showing a state in which a shooting screen is set to a standard screen.

FIG. 8 is a horizontal cross-sectional view of the finder device of the camera of the second embodiment of the present invention, showing a state in which the finder screen is set to a narrow angle-of-view screen.

FIG. 9 is a horizontal sectional view of the finder device of the camera of the second embodiment, showing a state in which the finder screen is set to the standard screen.

FIG. 10 is a horizontal sectional view of the finder device of the second embodiment, showing a state in which the forced return mechanism starts to act on the panoramic field frame 8.

FIG. 11 is a view showing a finder screen when the forced return mechanism acts on the panoramic field frame 8 of the finder device of the second embodiment.

FIG. 12 is a horizontal sectional view of a viewfinder device of a camera according to a third embodiment of the present invention and a front view of a view angle switching button.

FIG. 13 is a view showing another state of the finder apparatus of the third embodiment.

FIG. 14 is a vertical cross-sectional view of a viewfinder device of a camera of the third embodiment and a front view of an angle-of-view changing unit of a photographing system.

FIG. 15 is a vertical sectional view of a viewfinder device of a camera of the third embodiment and a front view of an angle-of-view changing means of a photographing system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Viewfinder base plate 5 ... Field lens 6 ... Porro prism 8 ... Panoramic view field frame 2, 3a, 3b ... Objective lens 9 ... Transmission lever 4 ... Plane mirror 7 ... Eyepiece lens 10, 22 ... Switching lever 11 ... Return spring 12 ... Field mask 14, 21 ... Panorama switching button 15, 33 ... Ring member 16, 17 ... Blade member 31, 32 ... Detection switch

Claims (5)

[Claims] 1. A camera configured such that the angle of view of both the photographing screen and the viewfinder screen can be changed by separate angle-of-view restricting members by operating the angle-of-view changing operation member. The camera is provided with a biasing means for constantly biasing the angle of view restricting member for changing the angle of view toward the narrow angle of view. 2. A camera configured so that the angle of view of both the shooting screen and the viewfinder screen can be changed by separate angle-of-view restriction members by operating the angle-of-view changing operation member. Urging means for constantly urging the angle-of-view restriction member for changing the angle of view toward the narrow angle-of-view side, and when the angle-of-view restriction member is not moved to the side of the narrow angle of view by the urging means. A camera including: a force returning unit that returns the angle-of-view restriction member to the narrow angle side. 3. A shooting screen image in a camera configured so that the view angle of both the shooting screen and the viewfinder screen can be simultaneously changed by different view angle regulating members by operating the view angle changing operation member. From the first detecting means for detecting the position of the angle regulating member, the second detecting means for detecting the position of the viewfinder screen angle regulating member, and the change of the output state of the first and second detecting means. It has a means for detecting a mismatch between the angle of view of the photographing screen and the angle of view of the viewfinder screen, and a warning means for giving a warning when the mismatch of the angle of view of both screens is detected. A camera characterized by that. 4. The camera according to claim 2, wherein the forcible return means has an engagement relationship that provides a predetermined immovable range between the operating member and the operated member. 5. The urging means is made of an elastic member such as a spring or rubber and has a function of preventing vibration and rattling of the angle-of-view restricting member. Camera.