JPH06281997A - Finder structure for camera provided with panoramic function - Google Patents

Abstract

PURPOSE:To provide finder structure for a camera provided with a panoramic photographing function in which a visual field frame is switched to a frame for ordinary photographing and a frame for panoramic photographing in accordance with a photographing mode, and where dust is prevented from infiltrating into the inner side of a finder by obtaining structure that link between a switching operation part and a visual field frame switching mechanism in the photographing mode is performed through a single hole formed in a finder housing. CONSTITUTION:A panoramic visual field frame 15 is supported to freely slide on a visual field frame plate 10 where an ordinary visual field frame 11 is formed. By allowing the frame 15 to slide, the range of the frame 11 is moved forward and backward. The frame 15 is allowed to slide by turning a visual field frame switching lever 20 turnably supported by the housing 23 of the finder. The tip part of the shaft part 22 of the lever 20 is projected to the outside of the finder from the hole 24, and a finder driving lever 25 is linked with the tip part, and a photographing mode switching lever 30 is linked with the lever 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a viewfinder of a camera having a panoramic function capable of switching between shooting at a normal angle of view and shooting at a wide angle in a horizontal direction.

[0002]

2. Description of the Related Art A variable focus device such as a focus switching function or a zoom function that can change the focal length of a taking lens so that a photograph can be taken easily, or an auto focus lens that focuses the subject on the subject 2. Description of the Related Art Cameras equipped with a focus device and a panoramic function capable of changing the angle of view for shooting, particularly so-called compact cameras, have become popular.

In the above compact camera, a finder optical system is provided as an optical system for observing an object in addition to the taking optical system. With a camera equipped with a panoramic function, the angle of view of the photographic optical system differs and the range of the subject differs between normal shooting for shooting at a normal angle of view and panoramic shooting for shooting at a panoramic angle of view. , It is necessary to change the field of view of the finder optical system accordingly.

Conventionally, the change of the field frame according to the angle of view in the viewfinder of a camera having this type of panoramic function is
A visual field frame for normal photography and a visual field frame for panoramic photography are formed in advance on the visual field frame plate, and the photographer selects a predetermined visual field frame according to each photography mode of normal photography and panoramic photography. I am trying.

[0005]

However, in a viewfinder in which a field frame for normal shooting and a field frame for panoramic shooting are formed on the field frame plate so that the photographer can select either one, It is necessary to check the shooting mode every time. In particular, if the subject is dynamic, there is a momentary opportunity to take a photo, and the user may shoot without checking the shooting mode, and the desired shooting may not be performed. Also,
Even if there is time from the previous shooting to the next shooting, the user may forget to check the shooting mode and may not be able to perform the desired shooting. Therefore, a finder is being developed in which the field of view frame is switched between normal shooting and panoramic shooting depending on the shooting mode.

By placing the visual field frame on the real image plane, the visual field frame is limited and the visual field frame becomes clear.
A so-called real image finder may be used. In this real-image viewfinder, an inverted real image formed by an objective lens and connected to a field frame is made into an erect image by an erecting optical system such as an erecting prism, and the image is magnified and observed with an eyepiece. . Therefore, if dust or the like adheres to the focal plane, it is magnified and observed together with the subject, which makes it difficult to observe the subject. However, when the structure of switching the field frame is used, a mechanism for moving the field frame in association with the change of the photographing mode is required inside the viewfinder, and a transmission mechanism for transmitting power to the mechanism from outside the viewfinder is required. Since this transmission mechanism must communicate with the inside and outside of the finder, a through hole for inserting the transmission mechanism in the finder housing is required. When a large number of these through holes are formed, dust easily enters the finder through these through holes and dust easily adheres to the focal plane.

Therefore, the present invention provides a viewfinder structure for a camera with a panoramic function that can switch the field of view frame according to the photographing mode and can prevent dust from entering the viewfinder as much as possible. Has an aim.

[0008]

As a technical means for achieving the above-mentioned object, a viewfinder structure according to the present invention observes a subject by an optical system other than a photographing optical system for determining the composition of the subject. In a viewfinder structure of a camera with a panoramic shooting function that can switch between normal shooting and panoramic shooting, a view frame plate with a normal view frame is formed on the focal plane of the viewfinder optical system. Arranged facing each other, slidable along the view frame plate, provided with a pair of panoramic view frame frames that advance and retreat to the range of the normal view frame by the sliding, and form a panoramic view frame when entering. A view frame switching lever having an engaging portion that engages with the panoramic view frame is provided with a viewfinder housing which has a shaft portion substantially at the center thereof and which houses a viewfinder optical system. It is rotatably provided by inserting it through the through hole formed in the ring, and the shaft part of the field frame switching lever is engaged with the finder drive lever arranged outside the finder to set the finder drive lever to the shooting mode. It is characterized in that it is linked to a shooting mode switching lever for switching between normal shooting and panoramic shooting, and the panoramic field frame slides by operating the shooting mode switching lever.

[0009]

When the photographing mode switching lever is operated, the finder drive lever linked thereto is rotated, and the view frame switching lever is rotated by the rotation of the finder drive lever. Since the panoramic field frame is engaged with the field frame switching lever, the panoramic field frame slides as the field frame switching lever rotates. For this reason,
When the shooting mode switching lever is switched from the normal shooting mode to the panoramic shooting mode, the panoramic field frame enters the range of the normal field frame and overlaps with a part of the normal field frame, and the field frame is panoramic shot. Switch to the field frame for use. When the shooting mode switching lever is switched to the normal shooting mode, the panoramic view frame is retracted from the range of the normal view frame, the normal view frame is opened, and the view frame is switched to the view frame for normal shooting. .

When the photographing mode switching lever is operated, the photographing mode of the camera is switched to either the normal photographing mode or the panoramic photographing mode. The switching of the shooting mode may be either a mechanical structure switch or a shooting information change. That is, in the case of a mechanical structure, a light shielding plate provided in front of the aperture rotates to cover a part of the aperture during panoramic shooting to form a horizontally long screen, and retracts from the position where the aperture is covered during normal shooting. And open the aperture. In the case of shooting information, shooting information according to the shooting mode is printed at an appropriate location on the film following the shooting of the subject at the time of release, and at the time of printing at the angle of view of normal shooting or panorama shooting according to this shooting information. Print at the angle of view.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The finder structure of a camera with a panoramic function according to the present invention will be specifically described below based on the illustrated embodiments.

FIG. 2 is a vertical cross-sectional view of a central portion for explaining a schematic structure of a real image type finder suitable for having the finder structure, in which a condenser lens 2 and a prism 3 are arranged behind the objective lens 1. The reflecting surface of the prism 3 is the focal plane 4 on which the image of the subject is formed.
The subject light reflected by the reflecting surface of the prism 3 is emitted from the prism 3, reflected by the roof mirror 5, further reflected by the mirror 6, and magnified by the eyepiece 7 for observation.

As shown in FIG.
A visual field frame having the structure shown in FIG. 2 is provided, and the visual field frame is enlarged by the eyepiece lens 7 together with the image formed on the focal plane 4. This field frame is composed of a field frame plate 10 on which a normal field frame 11 corresponding to the normal shooting mode is formed and a pair of panoramic field frame frames 15 corresponding to the panorama mode. The normal visual field frame 11 of the visual field frame plate 10 is formed by a through hole punched into a substantially rectangular shape at a position deviated from the center of the visual field frame plate 10. Four engaging pins 12 are provided at appropriate positions at the four corners of the field frame plate 10, and a pair of these engaging pins 12 are provided at positions sandwiching the normal field frame 11, The other pair is provided on the field frame plate 10 at a position where the normal field frame 11 is not formed. An insertion hole 13 is formed at a position between the pair of engaging pins 12 and the adjacent engaging pins 12 of the other pair of engaging pins 12.

On the other hand, the panoramic field frame 15 is made of a thin plate formed in a substantially L shape, is provided by combining the L shape into a substantially rectangular shape, and the one arms of the L shape are opposed to each other and the one arm is a panorama. A frame portion of the panoramic view field frame is formed as the frame 16. A pair of elongated holes 18 are formed in the L-shaped other arm 17 along the longitudinal direction of the arm 17. Further, an engaging hole 19 whose longitudinal direction is the width direction of the other arm 17 is formed in substantially the center of the other arm 17. Then, the panoramic visual field frame frame 15 is set to the focal plane 4 side, and the visual field frame plate 10 is provided.
, The engaging pin 12 of the visual field frame plate 10 is inserted into the elongated hole 18 and the panoramic visual field frame frame 15 is inserted into the visual field frame plate 10.
It is slidably held by the above, and the engaging hole 19 is made to coincide with the through hole 13 of the field frame plate 10.

Panoramic field frame of the field frame plate 10
A field frame switching lever 20 is provided on the surface opposite to the surface holding 15. Engaging pins 21 as engaging portions for inserting the insertion holes 13 of the field frame plate 10 are planted at both ends of the field frame switching lever 20, and the panoramic field frame is inserted through the insertion holes 13. The engaging hole 19 of the frame 15 is inserted. A shaft portion 22 that extends downward is formed in the center of the field frame switching lever 20. The shaft portion 22 has a substantially circular cross-section at the base end and a chamfered front end. Has been done. Then, the shaft portion 22 is inserted through the through hole 24 formed in the finder housing 23, and the base end portion is formed through the through hole 24.
It is located inside and the tip projects outside the viewfinder. Therefore, the visual field frame plate 10, the panoramic visual field frame frame 15, and the visual field frame switching lever 20 are provided inside the finder.

A finder drive lever 25 is arranged outside the finder, and a tip end portion of a shaft portion 22 of the field frame switching lever 20 is provided in a receiving hole 26 formed at a substantially central portion of the finder drive lever 25. Accepted. A roller 27 is rotatably supported at one end of the finder drive lever 25 so as to project in a direction opposite to the finder side and to be rotatable. Further, the other end of the finder drive lever 25 is appropriately bent to form an engagement arm 28, and a return spring (not shown) is stretched between the engagement arm 28 and the camera body, and the return spring The restoring force is urged to rotate the finder drive lever 25 in a direction in which the roller 27 is pressed by the cam surface of the photographing mode drive lever as described later. After inserting the shaft portion 22 of the field frame switching lever 20 into the receiving hole 26,
A set screw 29 is screwed onto the tip end surface of the shaft portion 22 so that the field frame switching lever 20 and the finder drive lever 25 are not separated from each other.

The roller 27 of the finder drive lever 25 is linked to the photographing mode switching lever 30. The shooting mode switching lever 30 is, for example, as shown in FIG.
A cam surface 31 is formed on one side surface, and a knob (not shown) exposed to the outside of the camera is slid in the direction indicated by arrow Q by the photographer. The shooting mode of the camera is switched between the normal shooting mode and the panoramic shooting mode in conjunction with the operation of the shooting mode switching lever 30.

The operation of the viewfinder structure of the camera with a panoramic function according to the present invention constructed as described above will be described below.

In the assembled state of the finder, the panoramic field frame 15 and the field frame plate 10 are disposed in the vicinity of the focal plane 4 of the prism 3, and the field of view is provided in the long hole 18 of the panoramic field frame 15. The engagement pin 12 of the frame plate 10 is inserted and the panoramic field frame 15 is held by the field frame plate 10. It is preferable that the tip of the engaging pin 12 is fitted into a recess formed in the prism 3 so that the field frame plate 10 is held by the prism 3.

A visual field frame switching lever 20 is provided on the surface of the visual field frame plate 10 opposite to the prism 3, and an engaging pin 21 of the visual field frame switching lever 20 inserts the through hole 13 of the visual field frame plate 10. It is inserted and inserted into the engaging hole 19 of the panoramic field frame 15. The shaft portion 22 of the view frame switching lever 20 penetrates the through hole 24 of the housing 23 of the finder and projects to the outside of the finder, and the circular portion of the base end portion of the shaft portion 22 is positioned inside the through hole 24. Let Then, the receiving hole 26 of the finder drive lever 25 is fitted into the tip end portion of the shaft portion 22 so that the field frame switching lever 20 and the finder drive lever 25 are coupled so as to rotate integrally, and the tip end surface of the shaft portion 22. If the set screw 29 is screwed on and tightened, the viewfinder drive lever 25 turns
Will not fall out of.

Next, if the assembled finder is fixed to the camera body, the roller of the finder drive lever 25 is fixed.
27 contacts the cam surface 31 of the shooting mode switching lever 30 provided on the camera body, and the roller 27 is pressed against the cam surface 27 by the restoring force of the return spring (not shown).

When the photographing mode of the camera is the normal photographing mode, the roller 27 of the finder drive lever 25 is in contact with the end of the cam surface 31 as indicated by the symbol N in FIG. The field frame drive lever 20 is positioned.
Then, at the position of the field frame drive lever 20, the panoramic field frame frame 15 engaged with the engagement pin 21 is retracted from the range of the normal field frame 11 of the field frame plate 10, and the normal field frame 11 is It is open.

When the subject is observed with the finder in this state, the image is formed on the focal plane 4 of the prism 3 through the objective lens 1. The field frame is provided in close proximity to the focal plane 4, and the image is formed within the field frame. Then, the light is reflected by the prism 3 and the right and left are inverted by the roof mirror 5, and the up and down is inverted by the mirror 6 to form an erect normal image, which is enlarged and observed with the field frame by the eyepiece 7.

When the photographing mode is switched to the panoramic photographing mode, the photographing mode switching lever 30 is slid to the left in FIG. As a result, the roller 27 receives the restoring force of the return spring (not shown) and abuts on the center side of the cam surface 31 as indicated by the symbol P in FIG. Therefore, the finder drive lever 25 rotates clockwise in FIG. 1, and the field frame switching lever 20 also rotates in the same direction. By the rotation of the visual field frame switching lever 20, the panoramic visual field frame frame 15 is guided by the engagement pin 12 and slides in a direction in which the panoramic frame 16 composed of one arm of the L-shape approaches each other. The sliding of the panoramic field frame 15 causes the panoramic frame 16 to be the normal field frame 11 of the field frame plate 10.
Then, the panoramic field frame is formed by narrowing the field frame range. Therefore, when the object is observed with the viewfinder in this state, the image formed in the panoramic field frame is observed together with the panoramic field frame, and the image can be taken at an angle of view suitable for panoramic shooting.

The field frame plate 10 is provided inside the viewfinder.
A panoramic view frame 15 and a view frame switching lever 20 are provided, and a viewfinder drive lever 25 is provided outside the viewfinder.
Since the finder drive lever 25 and the field-of-view frame switching lever 20 are only connected to each other through the through hole 24 formed in the finder housing 23, dust and the like enter the inside of the finder. Is prevented as much as possible.

[0026]

As described above, according to the viewfinder structure of the camera with the panoramic function according to the present invention, the field frame, the panoramic field frame and the field frame switching lever are provided inside the viewfinder, and the field frame is provided. A viewfinder drive lever linked to the switch lever is provided outside the viewfinder, and the view frame switch lever and the viewfinder drive lever are linked only by the through hole formed in the viewfinder housing, which prevents dust from entering the viewfinder. The only permissible part is the through hole, and the entry of dust can be prevented as much as possible. Therefore, by assembling the finder in a dustproof room, it is possible to prevent the finder from becoming difficult to see due to dust or the like.

Moreover, since the field of view frame is switched between the normal shooting and the panoramic shooting, the photographer can confirm the shooting mode when observing the subject with the viewfinder and keep the subject within the field of view frame. By doing so, it is possible to reliably take a picture on a desired screen.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a finder structure according to the present invention, and is a schematic exploded perspective view of components constituting a field frame.

FIG. 2 shows an example of a finder provided with this finder structure, and is a vertical cross-sectional view of a central portion of a real image type finder.

[Explanation of symbols]

 4 focal plane 10 field frame plate 11 normal field frame 12 engagement pin 13 insertion hole 15 panoramic field frame 16 panorama frame 18 elongated hole 19 engagement hole 20 field frame switching lever 21 engagement pin 22 shaft portion 23 housing 24 through hole 25 Finder drive lever 26 Receiving hole 27 Roller 28 Engaging arm 29 Set screw 30 Shooting mode switching lever 31 Cam surface

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[Procedure amendment]

[Submission date] October 28, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The finder structure of a camera with a panoramic function according to the present invention will be specifically described below based on the illustrated embodiments. In this embodiment, a camera with a zoom device is used.
Equipped with this structure in the zoom finder
The case is shown.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

FIG. 2 is a vertical cross-sectional view of a central portion for explaining a schematic structure of a real image type finder suitable for having the finder structure, in which a condenser lens 2 and a prism 3 are arranged behind the objective lens 1. The reflecting surface of the prism 3 is the focal plane 4 on which the image of the subject is formed.
The subject light reflected by the reflecting surface of the prism 3 is emitted from the prism 3, reflected by the roof mirror 5, further reflected by the mirror 6, and magnified by the eyepiece 7 for observation. It should be noted that at least the lenses that make up the objective lens 1
Part of this is linked to the zoom operation of the shooting lens (not shown).
The viewfinder magnification by changing the direction of the optical axis.
It is being changed.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0015

[Correction method] Change

[Correction content]

Panoramic field frame of the field frame plate 10
A field frame switching lever 20 is provided on the surface opposite to the surface holding 15. Engaging pins 21 as engaging portions for inserting the insertion holes 13 of the field frame plate 10 are planted at both ends of the field frame switching lever 20, and the panoramic field frame is inserted through the insertion holes 13. The frame 15 is inserted into the engaging hole 19. A shaft portion 22 that extends downward is formed at substantially the center of the field frame switching lever 20. The shaft portion 22 has a substantially circular cross-section at the base end and is chamfered at the front end. Has been done. Then, the shaft portion 22 is inserted through the through hole 24 formed in the finder housing 23, and the base end portion is formed through the through hole 24.
It is located inside and the tip projects outside the viewfinder. Therefore, the visual field frame plate 10, the panoramic visual field frame frame 15, and the visual field frame switching lever 20 are provided inside the finder.

Claims (1)

[Claims] 1. A viewfinder for observing a subject by an optical system different from the photographing optical system for determining the composition of the subject, with a panoramic photographing function capable of switching between normal photographing and panoramic photographing. In a finder structure of a camera, a field frame plate having a normal field frame is disposed so as to face the focal plane of the finder optical system, and is slidable along the field frame plate. A pair of panoramic field frame frames that form a panoramic field frame when entering and exiting within the range of the field frame are provided, and a field frame switching lever having an engaging portion that engages with the panoramic field frame is provided at a substantially central portion thereof. The shaft portion is rotatably provided by inserting it into a through hole formed in a finder housing that houses the finder optical system. The finder drive lever provided in the camera section is engaged with the finder drive lever, and the finder drive lever is linked to a shooting mode switching lever that switches the shooting mode between normal shooting and panoramic shooting. The viewfinder structure of the camera with a panoramic function characterized by the sliding frame.