JPH03290633A - Parallax correcting device for camera - Google Patents

Abstract

PURPOSE:To correct parallax without changing the visual field of a finder and the optical axis of a photographing lens unit by moving a movable exposing window together with a film by as much as a parallax amount on a film surface in accordance with an object distance. CONSTITUTION:By two-step pushing release, the film 7 and the movable exposing window 12 are moved in a direction A1 by as much as the moving amount of an image plane with the focusing action of a photographing lens unit 6. As for this action, a shaft 14 moves along a long hole 15a toward a rack 12a, a pinion 13 meshes with the rack 12a, and the pinion 13 is rotated by interlocking with the moving amount corresponding to the object distance of the unit 6, then the film 7 and the window 12 are moved by the moving amount of the image plane with the rotation of a winding gear 10 and the rotation of the pinion 13. Thus, the parallax amount on the surface of the film 7 is corrected in accordance with the object distance and a focal distance by moving only the film 7 and the window 12.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a camera parallax correction device, and more specifically, to a camera parallax correction device that corrects parallax on a film plane that changes depending on the subject distance and changes the viewfinder field of view. The present invention relates to a parallax correction device for a camera that corrects parallax between a viewfinder field of view and a photographic lens.

[Conventional technology]

A camera equipped with a 35mm lens shutter.

Generally, the finder and photographic lens are constructed separately, so the distance between the photographic lens and the film surface can be shortened.
It has the advantage of being compact.

Recently, lenses with long focal lengths such as bifocal lenses and zoom lenses have been installed in lens-shutter cameras.

Therefore, when photographing a close object with a long focal length, the deviation between the viewfinder field of view and the photographing range becomes very large.

To solve this problem, there are conventional methods such as changing the field of view of the finder, changing the optical axis of the photographic lens,
Alternatively, a method has been adopted in which a mirror, parallel plane plate, or the like is provided in the optical path of the photographing lens and the mirror is tilted.

Among these, Japanese Patent Application Laid-open No. 59-131916 (hereinafter referred to as "first document") describes a method in which a lens is placed on the line connecting the optical axis of the finder and the photographing lens system in conjunction with the back and forth movement of the photographic lens by adjusting the distance. , it is disclosed that a photographing lens system is moved in parallel.

Furthermore, in Japanese Patent Application Laid-Open No. 59-50431 (hereinafter referred to as "Second Document"), a deflection swinging lens is provided in front of the photographic lens, and the deflection swinging lens is provided in front of the photographic lens, and the deflection swinging lens is attached to the front surface of the photographic lens. Slide the moving lens.

A device configured to cancel the parallax of the finder and remove the parallax at the photographing distance has been disclosed.

Furthermore, Japanese Patent Application Laid-Open No. 59-48743 (hereinafter referred to as “3rd Patent Application”)
According to the literature, parallax in the camera is corrected by tilting the optical axis of the photographing optical system using a cam installed on the distance adjustment ring of the lens on the line connecting the finder and the photographing optical system, or a mechanism linked to distance adjustment. A parallax correction device is disclosed.

Similar to this third document, as a parallax correction device for a camera, Japanese Patent Application Laid-Open No. 59-42529 (hereinafter referred to as "fourth document") provides a deflection filter in front of the photographic lens, and uses an automatic focusing device. A device is disclosed in which a deflection filter is rotated in conjunction with movement of a lens system.

Also, Japanese Utility Model Application Publication No. 59-144634 (hereinafter referred to as Utility Model Publication No. 59-144634).

``Fifth Document'') states that in a camera whose imaging optical system is composed of two total reflection mirrors placed between the photographic lens and the film surface, when adjusting the focus, the optical axis of the photographic lens is An automatic parallax correction device is described which is configured to rotate one of the total reflection mirrors in the same manner as the above.

[Problem that the invention seeks to solve]

However, in the case of the above-described method of changing the field of view of the finder, there is a problem in that it is troublesome for the photographer because the range that the photographer had previously intended changes.

Furthermore, in the case of Documents 1 to 5, the imaging performance deteriorates because the entire photographic lens or a part of the photographic lens is moved, or a mirror or the like is moved in the optical path of the photographic lens. The problem is that it is easy.

This invention was made in view of the above-mentioned circumstances, and its purpose is to correct the parallax between the viewfinder field of view and the photographing area of the photographing lens without changing the viewfinder field of view and the optical axis of the photographing lens unit. An object of the present invention is to provide a parallax correction device for a camera that can perform the following functions and has little deterioration in photographic performance.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a camera in which the optical axis of incidence of the finder and the optical axis of incidence of the photographing lens do not coincide, and the direction of deviation of both optical axes is set to the running direction of the film. a lens unit, a movable exposure window disposed in front of the exposed portion of the film so as to be movable in the film movement direction, and an amount of parallax on the film surface of the photographing lens unit calculated according to the subject distance. The present invention is characterized by comprising a displacement means for displacing the movable exposure window together with the film.

1. In the camera parallax correction device configured as described above, the optical axis of the photographing lens unit, which does not coincide with the incident optical axis of the viewfinder, is set in the film running direction, and the zoom is adjusted according to the subject distance. In the case of a lens, etc., the displacement means moves along with the film according to its focal length. Since the exposure window is moved by the amount of parallax on the film plane, it is possible to easily adjust the photographic lens system without changing the viewfinder field of view. This system reliably corrects the parallax between the viewfinder field of view and the photographic lens unit without moving the camera.

[Example] Hereinafter, an example of the present invention will be specifically described based on the drawings.

FIG. 1 is a perspective view showing the overall configuration of a camera parallax correction device according to the present invention.

In FIG. 1, reference numeral 1 denotes an eyepiece lens attached to a finder eyepiece window of a camera body (not shown), and an eye 2 is brought close to this eyepiece lens 1 to look into the finder.

Further, in the camera body, a Porro prism 3 is arranged in front of the eyepiece 1, and in front of this Porro prism 3, a first objective lens 4 and a second objective lens 5 are arranged. Thus, the eyepiece lens 1, the Porro prism 3, the first objective lens 4, and the second objective lens 5 constitute a real-image type finder F.

Further, Of is the incident optical axis of the finder F, and the photographing lens unit 6 is attached to the camera body with a distance between the incident optical axis of and the optical axis ○t of the photographing lens unit 6.

The film 7 is fed out from the cartridge 8 and is moved to the winding shaft 9.
It is designed to be rolled up by The cartridge 8 is loaded into the cartridge chamber of the camera body, and the winding shaft 9 is attached to the camera body.
A hoisting gear 10 is attached to its lower end.

This winding gear 10 is meshed with a gear attached to a motor of a film feeding unit (not shown), and when winding the film 7, the rotational force of the motor is transmitted to the winding gear 1 through this gear.
0, thereby rotating the winding shaft 9 and winding up the film 7 in the direction of arrow A1.

On the exposure side of the film 7, the photographing lens unit 6
A fixed window 11 is arranged behind the. This fixed window 11 is fixed to the camera body, and has a size slightly larger than the area of the photographing screen 7a for one frame of the film 7, that is, in this example, a size that can cover the amount of parallax to be corrected in the horizontal direction. It has a frame shape.

A movable exposure window 12 is arranged in front of the fixed window 11 with a small interval therebetween. The movable exposure window 12 is formed in substantially the same shape as the photographing screen 7a, and a rack 12a is provided at a predetermined position at the lower end thereof.

A pinion 13 is engaged with this rack 12a.

This pinion 13 is fixed to the upper end of a shaft 14, and the shaft 14 passes through a long hole 15a of the fixing member 15, and a gear 16 is attached to the lower end thereof.

A spring 18 is hung between the lower end of the shaft 14 and the spring hook 17, and when the release is pressed in two steps,
As the release lever 19 rotates clockwise, the shaft 14 moves within the elongated hole 15a due to the elasticity of the spring 18, and the pinion 13 meshes with the rack 12a, causing the movable exposure window 12 to move.
is arranged to move to the right when viewed from the subject side, that is, in the direction of arrow A1.

Further, a release lever 19 is pivotally attached to a predetermined location on the camera body by a pin 19a, and one end of the release lever 19 is adapted to engage with the lower end portion of the shaft 14.

This release lever 19 is for returning the movable exposure window 12 to its original position, that is, a position where parallax is not corrected. By driving the release lever 19 in the direction of arrow A2 in conjunction with the closing operation or film winding operation, the release lever 19 turns vI+ with the pin 19a as a fulcrum, and its one end presses the shaft 14 in the direction of arrow A2. It is supposed to be done.

As a result, the shaft 14 moves along the elongated hole 15a toward the subject, that is, to the left in FIG.
3 is separated from the rack 12a. After this separation, the movable exposure window 12 is returned to its original position by a spring (not shown).

Thus, the pinion 13, shaft 14, gear 16, spring hook 17, spring 18, and release lever 19 are the main components,
A displacement means 20 is configured.

The reason why the film 7 and the movable exposure window 12 are both moved by the displacement means 20 is to maintain the flatness of the film screen to be exposed.

The operation of this embodiment configured in this way will be explained.
First, the principle of parallax correction according to the present invention will be explained with reference to FIG.

As shown in FIG. 2, it is assumed that the finder F and the photographing lens unit 6 are installed such that the optical axis Ot of the photographing lens unit 6 and the incident optical axis Of of the finder are separated by a distance.

Furthermore, if the subject distance from the subject to the film 7 is TT, then the magnification M of the photographic lens unit 6 is as follows (1)
It is given by Eq.

M-phrase...
... (1) 2·f-TT However, f is the focal length of the photographic lens unit 6.

Furthermore, the viewfinder field of view above the subject is set to S□82, and the shooting range is set to Y1Y2. Let Off be the field of view center of the finder F, that is, the incident optical axis, and Ot be the center of the photographing range of the photographic lens unit 6.

Further, the field center Of of the finder F on the subject B and the finder field S2 correspond to Of' and S'82', respectively, on the film plane.

That is, with respect to the photographing screen Y'Y2', the finder field of view range s1's,' is shifted in the opposite direction to the finder F by the screen movement amount D'.

The screen movement amount D' at this time is expressed by the first-order equation (2).

2·f −TT If the photographing range is newly shifted by the screen movement amount D' and set, the parallax between the viewfinder field of view and the photographing screen will be eliminated.

As is clear from equation (2), the screen movement amount D' is a function of the focal length f, the subject distance TT, and the distance between the incident optical axis Of of the finder F and the optical axis Ot of the photographic lens unit 6. Therefore, these must be given, but this interval can be set in advance, and if the photographic lens unit 6 is a zoom lens, the focal length f can be determined by the rotation angle or movement of the zoom cam (not shown), etc. The amount can be detected using a potentiometer or a rotary encoder, and the subject distance TT can be determined using an AF (autofocus) unit (not shown).

Next, specific operations will be explained along the flowchart of FIG.

It is assumed that the entrance window of the finder F is located in the horizontal direction with respect to the photographing lens unit 6 and is shifted to the left with respect to the photographing lens unit 6 by the above-mentioned distance.

First, if the second release switch is on in the determination processing step of "Is the second release ON?" in the flowchart, the process moves to the processing step of "taking lens focal length information f" in the flowchart, and the focus of the taking lens unit 6 is The distance is detected using, for example, a potentiometer or a rotary encoder, and then the process moves to the "subject distance TTJ processing step" in the flowchart.

In this processing step, the AF unit determines the focus position of the photographing lens unit 6 on the subject B.

That is, the subject distance TT from the subject to the film 7
is calculated, and the flowchart moves to the processing step of [Screen movement amount D' calculation].In addition to the 1-interval interval, the above-mentioned focal length f
This screen movement amount D' is calculated from the above equation (2) based on the subject distance TT.

When this process is completed, the process advances to the determination process step of "Is the second release ON?" in the flowchart.

If the second release switch is off, the process returns to the determination process step of "Is the second release ON?".

Furthermore, if the second release inch is turned on by pressing the release button two steps, the process proceeds to the process step "Film and exposure window movement" in the flowchart, and the film 7 and the moving exposure window 12 are moved in the right direction as seen from the subject side. That is, arrow A
It moves in one direction by the screen movement amount D' together with the focusing action of the photographic lens unit 6. This operation is performed by the shaft 14
moves toward the rack 12a along the elongated hole 15a, and the pinion 13 meshes with the rack 12a, and the pinion 13 moves in conjunction with the amount of movement of the photographing lens unit 6 corresponding to the subject distance TT, although not shown in the drawings. It is rotated by an appropriate driving means.

As a result, due to the rotation of the hoisting gear 10 and the rotation of the pinion 13, the screen moves in the direction of arrow A1 by the screen movement amount D'.

In this way, by moving the film 7 and the movable exposure window 12 by the screen movement amount D', the amount of parallax on the surface of the film 7 is corrected according to the subject distance TT and the focal length f. .

In order to correct this parallax, after the film 7 and the movable exposure window 12 have moved as described above, the process moves to the "shutter opening/closing" processing step in the flowchart, in which the shutter unit (not shown) is operated and the shutter is closed. is opened and closed, the film 7 is exposed with the parallax corrected, and a subject image is photographed on the film 7.

In this way, once one frame of the subject has been photographed with parallax corrected, the process moves to the "return to exposure window reference position" processing step in the flowchart. In conjunction with the operation, the release lever 19 is driven in the direction of arrow A2 against the elasticity of the spring 18.

As a result, the release lever 19 rotates about the pin 19a, and one end of the release lever 19 moves the shaft 14 into the first position.
Since it is pressed diagonally forward to the left in the figure, the shaft 14 moves along the long hole 15a, and the pinion 13 moves to the rack 12a.
leave for a certain period of time.

Therefore, the engagement state of the movable exposure window 12 is released, and the movable exposure window 12 returns to its original position, that is, a position where no parallax correction is required, due to the elasticity of a spring (not shown), and the "Film Winding ” processing step.

In this processing step, at the same time as the movable exposure window 12 returns to its original position, a feeding unit (not shown) is operated to rotate the winding gear 10, and the exposed film 7 is rotated.
Roll up one piece.

The amount by which the film 7 is wound at this time is equal to one frame minus the screen movement amount D'.

As described above, according to this embodiment, the direction of deviation between the optical axis of the photographing lens unit and the optical axis of incidence on the viewfinder is set to the traveling direction of the film, and the amount of parallax on the film surface is adjusted according to the subject distance and focal length. Since the movable exposure window placed in front of the film is moved along with the film, parallax can be eliminated without changing the field of view of the finder F or even moving the photographing lens system of the photographing lens unit 6. Therefore, it has the advantage of eliminating parallax even when the focal length is long and the subject distance is short, and there is little deterioration in screen performance, and it is possible to take photographs as intended by the photographer. .

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be modified in various ways without departing from the spirit thereof.

For example, in the above embodiment, the photographic lens unit 6
Although the explanation has been made for the case where the lens is a zoom lens, it can of course be applied to a so-called bifocal camera.In addition, when the lens has a single focal length, focal length information is required when calculating the above-mentioned screen movement amount D'. Since f is constant, there is no need for a focal length detection means, which simplifies the configuration.

〔Effect of the invention〕

As detailed above, according to the present invention, the direction of misalignment between the viewfinder incident optical axis and the optical axis of the photographic lens unit is set to the film running direction, and at least the amount of parallax on the film surface is adjusted according to the subject distance. Since the movable exposure window is configured to move in the film running direction together with the film, it is possible to correct parallax between the viewfinder field of view and the photographing lens system, and since the viewfinder field of view does not change even after parallax correction, it is easy for the image repellent to It is possible to provide a parallax correction device for a camera which eliminates troublesomeness and discomfort for users, and because the photographic lens system does not move, the photographed image is less degraded and can be photographed as intended by the photographer.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the overall configuration of an embodiment of a parallax correction device for a camera according to the present invention; FIG. 2 is an explanatory diagram for explaining the principle of parallax correction in the embodiment; FIG. 3 is a flowchart showing the flow of the operation of the same embodiment. 1...Eyepiece. 3...Porro prism, 4...First objective lens, 5...Second objective lens, 6...Photographing lens unit, 7...Film, 8... ...Patrone, 9...Hoisting shaft, 11...Fixed window, 12...Moving exposure window, 12a...Rack, 13... ... Pinion, 14 ... Shaft, 16 ... Gear, 19 ... Release lever 20 ... Displacement means, F ... Finder . 10...Hoisting gear. 18...Spring, Fig.

Claims (1)

[Claims] (1) In a camera in which the incident optical axis of the finder and the incident optical axis of the photographic lens do not match, a photographic lens unit in which the direction of deviation of both optical axes is set in the film running direction, and a camera that a movable exposure window disposed movably in the direction of movement of the film in front of the part; and a movable exposure window arranged along with the film by an amount of parallax on the film plane of the photographic lens unit calculated according to the subject distance. What is claimed is: 1. A parallax correction device for a camera, comprising: displacement means for displacing the camera.