JPH0251134A - Camera provided with parallax correcting device - Google Patents

Abstract

PURPOSE:To correct parallax without giving adverse effects to photographing performance by providing a driving means for actuating a photographing lens so that it may approach or go away from a finder without moving film. CONSTITUTION:The title camera is provided with focusing means 18, 19, 23 and 24 which adjust the focus of the photographing lens and guiding means 13, 15-17 which guide to move the photographing lens in a direction inclined against the optical axis at a prescribed angle. Then, the camera is also provided with driving means 14, 18, 19 and 23 which actuate the photographing lens so that it may approach the finder in a direction perpendicular to the optical axis of the photographing lens when the lens is actuated in a direction where the focus is adjusted in a close distance by driving the guiding means 13, 15-17 in interlocking with the actuation of the focusing means 18, 19, 23 and 24, and which actuate the photographing lens so that it may go away from the finder in a direction where the focus is adjusted in a long distance when the lens is actuated in such a direction. Thus, the parallax can be corrected so as to agree the center of the finder with the center of the image plane of the film.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention controls the amount of movement of a photographing lens in the direction of the optical axis, moves the lens toward the viewfinder in a direction intersecting the optical axis, and moves the lens toward the viewfinder. The present invention relates to a camera with a parallax correcting device that corrects the parallax between the viewfinder and the finder so that the center of the finder coincides with the center of the film screen.

Conventional technology Conventionally, in cameras that are not eye reflex cameras, in close-up photography, even if the subject is placed in the center of the film, the subject will not be in the center of the film screen, and the viewfinder's field of view will be affected. There was a certain amount of misalignment between the camera and the viewfinder screen. This is due to the fact that the optical axes of the finder and photographic lens are arranged parallel to each other and shifted from each other, and this tendency becomes more pronounced as the subject distance becomes shorter. Therefore, the user has to make the correction, and the user has to determine how close the subject is by checking the parallax correction mark in the finder and then select how to look through the finder.

One way to solve this problem is to correct parallax by tilting the film and the entire photographic optical system.

(Japanese Unexamined Patent Publication No. 59-48743). That is, a cam is provided in the distance adjustment ring of the photographic optical system, and when the photographic optical system is adjusted by the autofocus device during photographing with respect to the field of view of the finder, the cam is rotated by the rotation of the distance adjustment ring of the photographic optical system. move Due to the change in the shift amount of the cam due to the rotation of the cam, the entire photographing optical system is pushed by the cam, causing the entire photographing optical system to rotate toward the viewfinder around the fulcrum, changing the photographing range of the photographing optical system into the field of view of the finder. The configuration is such that the parallax is corrected so as to match the parallax.

However, in the structure described above, when the parallax correction is performed, the film holder on the rear side in the optical axis direction of the photographic optical system also moves to the fulcrum along with the photographic optical system. Twisting occurs in the film between the film holder and the film feeding device, resulting in loss of flatness of the film.
There was a problem in that it had a negative effect on photographic performance.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a camera with a parallax correction device capable of correcting parallax without adversely affecting photographing performance, in order to solve the above problems.

In order to achieve the above object, the present invention is configured to perform parallax correction by moving the photographing lens without moving the film. That is, in a camera having a photographic lens and a finder consisting of an optical system different from that of the photographic lens, a film frame fixedly installed, a focus adjustment means for adjusting the focus of the photographic lens, and a viewfinder configured to adjust the focus of the photographic lens are provided. A guide means for guiding the movement in a direction inclined at a predetermined angle with respect to the optical axis, and the guide means is driven in conjunction with the operation of the focus adjusting means, and when the guide means is operated in a direction to focus at a short distance, the photographing lens driving means for operating the photographing lens so as to approach the finder in a direction perpendicular to the optical axis of the lens, and for operating the photographing lens so as to move away from the finder in the direction when the photographic lens is operated in a direction to focus on a long distance; I configured it to look good.

In the above configuration, it is also possible to include an aperture/shutter member that is immovably installed so that its center is located on the movement locus of the optical axis of the photographic lens.

In the above structure, the center of the diaphragm/shutter member may be located approximately at the center of the movement range of the optical axis of the photographic lens.

In the above configuration, the parallax correction device moves the lens in a direction inclined at a predetermined angle (that is, the feeding inclination angle) to perform parallax correction. In this correction operation, for example, the predetermined angle θ is tanθ−(subject distance Nm
The lens may be moved so as to substantially satisfy the following relational expression (lens/finder parallax correction amount)/(lens extension amount at subject distance Nff1). This allows parallax correction to be performed to match the center of the finder with the center of the film screen.

Alternatively, the center of the shutter may be shifted by approximately 1/2 of the amount of parallax correction by moving the shutter parallel to the moving direction of the lens.

According to the above configuration, parallax correction can be performed by moving the lens so as to satisfy the above relational expression, and there is no need to adopt a configuration such as moving the film. There is no adverse effect on photographing performance due to loss of flatness or the like. Further, since only the lens is moved, the moving mechanism is simple, requires less strength, and costs are not so high. Furthermore, as a result of the parallax correction described above, it is possible to reproduce the state of the subject as seen in the finder on the film screen, and it is possible to effectively prevent errors such as the so-called cut off of the head or the cut off of the legs of the subject due to parallax. . Therefore, in the past, it was necessary to use a parallax correction mark or the like on the viewfinder's framing when the object was close, but with the present invention, such an operation is no longer necessary. Furthermore, by arranging the shutter eccentrically within the image circle of the lens, it is possible to reduce as much as possible the unevenness in the amount of light that is noticeable when shooting at the minimum aperture value.

Embodiments of the present invention will be described in detail below with reference to FIGS. 1 to 8.

Figure 1 shows the subject distance when the focal length of the photographic lens is 35 mm, the distance between the viewfinder optical axis and the lens optical axis (hereinafter referred to as "axis distance") is 30 mm, and the distance is adjusted so that parallax is 0 at infinity. 3 is a graph of the relationship between the amount of parallax correction of the lens and Figure 2 is a diagram showing the state of parallax O when photographed at infinity under the conditions of Figure 1, and Figure 3 is a diagram showing the state of maximum parallax when photographed at the shortest distance under the conditions of Figure 1. .

In the figure, 2 is the optical axis of the finder, 2 is the optical axis of the photographing lens, and 3 is the optical axis of the viewfinder.
is the film, 4 is the shutter, 5 is the axis interval, 6 is the center axis of the film screen, 7 is the finder, and L is the amount of parallax correction.

In Figure 1, the amount of lens extension is the subject pressure Hoo ~
Assuming that it is 1.25 mm for 1 m, when correcting parallax when the axis spacing is 30 mm, the parallax correction scale will be roughly as shown in FIG. 4 as follows.

tanθ=(lens/finder parallax correction amount at subject pressure H1m)/(lens extension amount at subject distance 11 degrees) =30/1000,. L = 35 =1.05mm
By moving closer, you can place the subject captured in the viewfinder at the center of the film screen. That is, this is jan-'(1,05/ 1.25)'-i
By extending the lens toward the camera body at an angle of 40 degrees, parallax in the finder can be corrected even when focusing at a distance of lx.

FIG. 5 shows a lens feeding device as a parallax correcting device which is an example of specifically implementing the above relationship.

The parallax correcting device includes an image frame (not shown) fixedly installed, a focus adjustment means for adjusting the focus of the photographic lens, and a guide for moving the photographic lens in a direction inclined at a predetermined angle with respect to its optical axis. and a driving means that drives the guide means in conjunction with the differential movement of the focus adjustment means to differentially move the photographing lens. This will be explained in detail below. In FIG. 5, numeral 10 denotes an aperture and diaphragm fixed to the camera body having the image frame (not shown) fixedly installed, and numeral 12 denotes a lens barrel slidably arranged with respect to the camera body. be. On the outer peripheral side of this lens barrel 12,
The bearing 1, which is inclined at a certain angle with respect to the optical axis direction, fixes the part 13 and the rotation stopper part 15 to form the lens barrel support member 1. In this embodiment, the inclination angle is 40 degrees. The bearing portion 13 and the rotation stop portion 15 guide the movement of the lens barrel 12 along a guide shaft 16.17 fixed to the camera body, and together with the guide shaft 16.17 constitute the above-mentioned guiding means. The bearing of the lens barrel 12 is provided with a bin 1 on the side of the portion 13.
4 are fixed together.

The lens barrel 12 is provided with a disc-shaped advance cam 18 rotatably supported by the camera body on the side, and the bin I4 is fitted into the cam M+9 of the cam 18, and when the cam 18 rotates, the mirror The cylinder I2 is attached to the pin 14 and the guide shaft 1.
6. Move along the 17th. The cam groove I9 drives the movement of the pin 14 so that the lens in the lens barrel 12 moves approximately according to the above relational expression via the second pin 14. An encoder 20 for detecting the cam position is integrally formed on the cam 18, and a detection member 25 detects the position of the cam 18.

A gear 21 is formed on the outer periphery of the cam I8, and this gear 21
meshes with the pinion 22 of the stepping motor 23.

Therefore, the position information of the cam I8 is input by the detection member 25 to the automatic focus distance measuring device 24 and compared with the automatic focus information, and the motor 23 is controlled to stop the cam 18. The motor 23 rotates based on the information from the automatic focus and distance measuring device 24 to rotate the cam 18 by a predetermined amount and rotates the lens barrel ■2.
, thus moving the lens into position. Therefore, the distance measuring device 24, the motor 23, the cam 18, the cam groove 19, etc. constitute the focus adjusting means.
, the cam groove 19, the pin 14, etc. constitute the driving means.

In the figure, 26 is a release device, and 27 is a spring that presses the pin 14 against the cam groove 19.

In addition, in the above camera, the diaphragm/shutter is eccentrically arranged so that the center of the shutter is shifted toward the viewfinder by an amount within the parallax correction range with respect to the direction perpendicular to the optical axis of the lens, so that It is possible to prevent unevenness in light amount as much as possible. At this time, if the deviation is set to approximately 1/2 of the amount of parallax correction, the unevenness in the amount of light can be best reduced. By doing as described in 2, appropriate photographed images can be obtained without extreme differences in light amount unevenness from infinity photography to closest photography.

In the parallax correcting device having the above configuration, when a release signal is output from the release 26, the photographing lens is controlled by the autofocus signal, and then the shutter release is automatically performed. Therefore, when controlling the photographic lens using the autofocus signal, the conventional photographic lens is moved to the viewfinder side perpendicular to the optical axis so as to correct only the fa and ingu parallax differences.

By driving the motor 23, the cam 18 is rotated via the pinion 22, and the lens barrel 12 is rotated via the pin 14.
is moved along the guide axis 16.17. This lens barrel 1
2 is a direction that is tilted by a predetermined angle from the optical axis direction (Ga 1
'Do axis 16. +7 axis direction), and the lens also moves to the viewfinder side, which is perpendicular to the optical axis direction of the lens.
Performs parallax correction for the photographic lens. Therefore, when the photographic lens is moved in a direction that focuses on a short distance, the photographic lens is moved so as to approach the finder in a direction perpendicular to the optical axis of the photographic lens;
When the photographic lens is moved in a direction that focuses on a long distance, the photographic lens is moved in that direction so as to move away from the finder.

According to the above embodiment, parallax correction can be performed by moving the photographing lens so as to satisfy the above relational expression, and there is no need to adopt a configuration such as moving the film, so that the flatness of the film is improved. There is no adverse effect on photographing performance due to loss of image quality. Furthermore, since only the photographing lens is avoided, the moving mechanism is simple, requires less skill, and costs are not so high.

Since the center of the viewfinder and the center of the film screen coincide with each other due to the parallax correction described above, it is possible to reproduce the state of the subject as seen in the finder on the film screen. Failures such as leg cuts can be effectively prevented. Therefore,
Conventionally, in the case of close-up, it was necessary to use a parallax correction mark or the like on the viewfinder framing, but in the above embodiment, such an operation is no longer necessary.

Note that the present invention is not limited to the above embodiments,
It can be implemented in various other ways.

For example, a case will be described in which the above relationship is applied to other cameras.

Another embodiment of the parallax correcting device of the present invention is shown in FIG. 6.7.8. In the figure, the rear part of the inner cylinder 35 is placed inside the front part of the fixed cylinder 30, and the inner cylinder part 32c of the operating ring 32 is screwed between the front part of the fixed cylinder 30 and the rear part of the inner cylinder 35. The operating ring 32 is rotated manually or by a drive device such as a motor.

In addition, in the figure, 30a is a straight key formed on the fixed cylinder 30;
35a is a key groove formed in the inner cylinder 35.
By inserting the key 30a of the fixed cylinder 30 into the key groove 5a of No. 5, the inner cylinder 35 moves back and forth without rotating relative to the fixed cylinder 30. Therefore, fixed cylinder 3
0, the inner cylinder part 32c of the operating ring 32, and the inner cylinder 3
A so-called double helicopter structure is formed with the rear part of the inner cylinder 35, and when the operation ring 32 is rotated forward and backward, the inner cylinder 35 moves back and forth along the front and rear direction without rotating with respect to the fixed cylinder 30. There is.

On the other hand, a movable barrel 3I housing a lens 33 is disposed in front of the inner barrel 35, and a flange 31 at the rear end of the movable barrel 31
A dovetail portion 31c is formed on the rear surface of b, and a dovetail groove 35b into which the dovetail portion 31c is slidably fitted is formed in the inner cylinder 35.
The fixed cylinder 35 and the movable cylinder 31 move integrally in the front-rear direction, while the inner cylinder 35 and the movable cylinder 31 move integrally in the front-rear direction. 7 to 35
The movable cylinder 31, that is, the dovetail portion 31c slides within the dovetail groove 35b. The movable cylinder 31 is urged upward by the spring 36 in the middle position in FIG. The inner peripheral surface 32b of the ring 32
A cam portion 32a is formed therein. Thus, the parallax correcting device has a fixed film frame (not shown), a focus adjustment means having a double helicoid structure and an operation ring 32, and a guide means having a dovetail structure, a cam portion 32a, and a double helicoid. and a driving means having a spring 36 and a cam portion 32a.

Therefore, when the operating ring 32 is rotated in the forward and reverse directions, the inner cylinder 35 and the movable cylinder 31 move back and forth with respect to the fixed cylinder 30 without rotation due to the double helicoid structure, and the cam of the operating ring 32 The portion 32a contacts the outer peripheral surface 31a of the collar portion 31b of the movable cylinder 3I, and the dovetail portion 31c
The movable cylinder 31 is moved relative to the inner cylinder 35 in a direction orthogonal to the front-rear direction by the guidance of the dovetail groove 35b.
I am trying to perform parallax correction. Therefore, when the photographic lens 33 is moved in a direction that focuses on a short distance, the photographic lens 33 is moved so as to approach the finder in a direction perpendicular to the optical axis of the photographic lens 33, while the photographic lens 33 in a direction that focuses on a long distance, the photographic lens 33 is moved in that direction so as to move away from the finder. With the above configuration, the same effects as those of the above embodiment can be achieved.

In addition, in the embodiment described in ■-, the parallax was configured to be 0 at infinity, but in order to make the parallax become 0 in the middle of the operating range of the photographing lens (for example, 5+), the optical axis of the finder lens should be 5 m away. Of course, it can also be applied to those configured to intersect with the optical axis of the photographic lens. In this case, the optical axis of the photographic lens coincides with the center of the film screen at the position where it focuses on 5R, and approaches the finder lens on the closer side l7,
They are configured to move away from each other at infinity. Therefore, the aperture (combined shutter) is different from the above example,
It is preferable to set it so that it aligns with the center of the film screen.

Also, regarding the direction of misalignment between the finder and lens,
In the embodiment described above, only the vertical direction has been described, but using the same concept as above, even in the diagonal direction, it can be constructed in the same way with a hole connecting the center of the finder and the center of the lens.
A similar effect can be achieved.

[Brief explanation of the drawing]

Figure 1 shows the lens parallax correction term for the subject distance when the focal length of the photographing lens is 35 mm, the distance between the viewfinder optical axis and the lens optical axis is 30 mm, and the adjustment is made so that parallax is 0 at infinity. Relationship graph, Figure 2 is the first
A diagram showing the relationship between the finder and lens when shooting at infinity with zero parallax under the conditions shown in the figure.Is Figure 3 under the conditions of Figure 1? Figure 4 is a diagram showing the relationship between the finder and lens when shooting at the shortest distance and the parallax is at its maximum.
In the figure, the relationship between the finder and the lens is shown when the lens extension amount is 1.25n+m and the axial distance is 30mm for the subject distance ■~Im, and FIG. 5 shows the parallax according to an embodiment of the present invention. FIGS. 6 to 8 are a perspective view showing a camera with a correcting device, and FIGS. 6 to 8 are a longitudinal sectional view, a front view, and a sectional view of a main part of a connecting portion between a movable cylinder and an inner cylinder in other embodiments, respectively. 1...Finder optical axis, 2...Photographing lens optical axis,
3... Film, 4... Shutter, 5... Axis spacing, 6... Center of film screen, 7... Finder,
11... Shutter 12... Lens barrel, I3.
...Bearing is part, I4...Bin, 15...Rotation stop part, 16.17...Guide shaft, 18...Cam, 19.
...Cam groove, 20...Encoder, 2I...Gear,
22... Binion, 23... Motor, 24... Automatic focus distance measuring device, 25... Detection member, 26... Release, 27... Spring, 30... Fixed barrel, 31
...Movable barrel, 32...Operation ring, 33...Lens,
35...Inner cylinder, 36...Spring. Patent Applicant Minolta Camera Co., Ltd. Agent Patent Attorney Maeda Ao and 2 others Page 2 Figure 4 Figure 1 Figure 3

Claims (3)

[Claims] (1) In a camera having a photographing lens (33) and a finder consisting of an optical system different from that of the photographing lens (33), adjusting the focus of the film frame fixedly installed and the photographing lens (33). focusing means (18, 19, 23, 24; 30, 32, 35); and guiding means (13, 15, 16, 1
7; 30, 31a, 31c, 32a, 32b, 35b)
and the focus adjustment means (18, 19, 23, 24; 30
, 32, 35), the guide means (13,
15, 16, 17; 30, 31a, 31c, 32a, 3
2b, 35b), and when the camera is activated to focus on a short distance, the photographic lens (33) is activated to approach the finder in a direction perpendicular to the optical axis of the photographic lens (33), Driving means (14, 18, 19, 23; 30, 32, 35, 3) that operates the photographing lens (33) so as to move away from the finder in that direction when the lens is operated in a direction in which the distance is in focus.
6) A camera with a parallax correction device, characterized in that it has the following. (2) The camera with a parallax correcting device according to claim 1, further comprising an aperture and shutter member that is immovably installed so that its center is located on the movement trajectory of the optical axis of the photographic lens (33). (3) The camera with a parallax correcting device according to claim 2, wherein the center of the aperture/shutter member is located approximately at the center of the moving range of the optical axis of the photographing lens (33).