JPS6070411A - Parallax corrector of autofocus camera - Google Patents

Abstract

PURPOSE:To correct parallax in the entire region of an object distance by moving an objective lens or field frame plate cooperatively with a scan plate displaced according to the object distance in prefocusing thereby changing the image position of the visual field or field frame. CONSTITUTION:When a release button is depressed, a release lever 41 is moved downward to actuate a photometric circuit, a distance measuring device, etc. A lock lever 31 is pushed by a projecting piece 41a and is thus disengaged from a link 32. A scan plate 30 is moved leftward by a spring 33 and a distance stopper 24 is turned clockwise by an interlocking pin 34. When a signal AF is outputted from the distance measuring device interlocked to the plate 30 during this time, a magnet 27 is deenergized and a pawl plate 26 is released and is turned by a spring 28 so that the plate is engaged to any one among the teeth 24b of the stopper 24. The plate 30 is moved by as much as the distance corresponding to the object distance by the pin 34 and is stopped then the 2nd objective lens 13 is vertically moved. The parallax is thus automatically corrected at all the object distances in the above-mentioned way.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a parallax correction device that corrects the discrepancy between the image of a subject captured on film through a photographic lens and the image of the subject seen through a finder. More specifically, it relates to an improved device that corrects parallax by changing the image position of the field frame during press-making.

[Prior art]

In compact cameras, where the photographic lens and finder are separate, the optical axis of the photographic lens and the optical axis of the viewfinder are ↓Iυ, so the object seen through the viewfinder is Positional scratches occur between the image and the subject image captured on the film. This misalignment is
Generally called vararax, the amount of deviation changes depending on the shooting distance, and becomes so large that it cannot be ignored, especially at short distances. As this vararax correction device, one in which a field frame for short distance correction is provided on a field frame plate has been widely used because of its simple structure. However, with this device, it is not possible to correct vararax over the entire imaging distance, and it is inconvenient that the field frame must be selected based on whether or not the object is close.

In addition, for cameras equipped with a rangefinder,
Conventionally, a device has been known in which vararax is corrected by moving the field frame plate 1' in conjunction with the rotation of the photographing lens. However, in an automatic zoom camera, the shutter is activated after the photographic lens is extended. Therefore, this device cannot be used because there is no time to check the field of view between the extension of the photographic lens and the adjustment.

〔the purpose〕

SUMMARY OF THE INVENTION An object of the present invention is to provide a vararax correction device for an autofocus camera that is capable of correcting vararax over the entire shooting distance.

[Main part of the invention]

In order to achieve the above object, the present invention eliminates parallax by changing the scan plate that is displaced according to the shooting distance during prefocusing performed before the release operation.

[Configuration of the first embodiment] In FIG. 1, a photographic lens 2. is attached to the +ii+ surface of the camera body 1. Finder 3. A distance measuring window 4 and a 5° strobe light emitting section 6 are provided, and a release button 7 is provided on the top surface. The photographic lens 2 is composed of a fixed lens barrel 8 and an IJJ sharpening barrel 10 that holds a lens base 9 and is slidably attached to the fixed lens barrel 8. The finder 3 is arranged directly above the lens system 9 in order to eliminate parallax in the left and right direction. The distance measuring window 4.5 has a light emitter and a light receiver arranged behind it, and as is well known, near-infrared light emitted from the light emitter, reflected by the subject, and returned. The shooting distance is measured by sensing with the light receiving section. Since this type of distance measuring device is widely known in this field as a triangulation type distance measuring device, a description of its configuration will be omitted.

FIG. 2 shows the structure of the fine gear according to the present invention. The finder 3 includes a first objective lens 12, a second objective lens 13. It is composed of a half mirror 14 and an eyepiece lens 15. A field frame 15a and a distance frame 15b are formed on the inner surface of the eyepiece 15, and the image is reflected by the half mirror 14, passes through the eyepiece 15 in a state where it is combined with the subject image, and is viewed by the photographer. I can see it. The half mirror 14 has a viewfinder or lli°5
In order to prevent the field frame 15a from becoming
5b is formed on the half mirror surface 14a.

The second female object lens 1:3 changes the field of view by vertically displacing it as shown by the arrow in accordance with the shooting distance detected by the distance measuring device during prefocusing, thereby eliminating parallax. The shaft is fixed.

Figure 3 (A) and (B) are close range! This shows the field of view before prefocusing and after prefocusing when aiming at the subject of jsIf, and reference numeral 15a' indicates the field of view frame 15.
15b is an image of distance measuring frame I5b. Before prefocusing, the field of view is set to 3 meters (for example, an intermediate distance that corresponds to the middle between far and near distances), so that even if the shooting distance changes to long or short distances, the field of view will change little. There is. After prefocusing, the second objective lens 13 moves upward, and the field of view moves downward as shown in FIG. The shear balax is corrected. After that, move the camera a little and get the image 15a of the field frame as shown in Figure 3 (Δ).
All you have to do is reframe the frame so that it falls within the angle and then take the picture.

FIGS. 4(A) and 4(B) show the viewfinder field of view before and after prefocusing when aiming at a distant subject. At this time, after prefocusing, the second objective lens 13 moves downward, and the field of view moves to the opposite side as shown in FIG. Parallax is corrected by moving downward.

After that, just move the camera to reframe the subject and take a picture, just as you did when shooting at close range. It should be noted that even in the case of an intermediate distance, the second objective lens 13 moves somewhat (parallax correction is performed), although it is not a case of a long distance or a short distance.

FIG. 5 shows an apparatus for applying the present invention. The interlocking pin 20 is implanted in a lens extension amount setting ring 21, and when the lens extension amount setting ring 21 is disengaged from the lock lever 22, the spring 23
rotates counterclockwise under the tensile force of The lens extension amount setting ring 21 has a plurality of step-shaped teeth 21a formed on its outer periphery, one of which engages with the locking piece 24a of the distance stopper 24 to stop its rotation.

The distance stopper 24 has a distance 1 to 1 at its tip.
Gear 24. A plurality of b are formed, and while rotating clockwise around the shaft 25, they are locked by the claw plate 26 and the position is controlled. is attracted by the magnet 27, and when the AI? signal is output from the range finder (not shown), the power to the makneso 1-27 is turned off or stopped, so the claw plate 26 receives the tensile force of the spring 2)). (rotate counterclockwise and engage the pawl 24b of the distance i%Il stopper 24).

30 to scan play 1 is 1. 'l Tsukreba 31
When the engagement with the link 32 is released, the spring; 33
It moves leftward in response to the tensile force J')+L2, and during this movement, the distance stopper 24 is rotated in the o'clock a1 direction via the distance adjusting cam 30a & the continuous lino pin 34 in contact with the distance adjusting cam 30a. Also, scan play 1/30' θ1111
A parallax correction cam 30b is formed at the cam 30b, and a cam follower 36 having a roller 35 attached to the lower end follows the cam 30b. This cam follower 36 is fixed to the lower part of the second objective lens 13.

Further, a plate 37 is provided on the side of the second objective lens 13.
is fixed, and a guide formed on this plate 37? The second objective lens 13 is guided downward by the l1t31a and the fixed bin 38. In addition, shooting lens system 9
When the optical axis 39 of the finder 3 and the optical axis 40 of the finder 3 are shifted from each other in the vertical direction to the horizontal direction, it is preferable to provide the guide groove 37a obliquely.

The release lever 41 is provided at the bottom of the release button 7 shown in FIG.
b, and is biased upward by a spring 42.

[Effects of the first embodiment] When you look through the finder 3 after setting up the camera, the field of view is as shown in FIG. 3(A), and the second objective lens 13 is not biased upward or downward. In this state, a part of the main subject is placed within the distance frame 15b, and then the release button 7 is pressed only in the previous position. When this release button 7 is pressed, the release lever 4 or spring 4
2, and as is well known, turn on the power switch to operate the photometry circuit, distance measuring device, etc.

At the end of the movement, the release lever 41
Push the lock lever~31 to engage with the link 32 IW
slow down When this link is released, the scan plate 30 biased by the spring 33 moves to the left and rotates the distance bar 24 clockwise via the interlocking pin 34. let While this distance stopper 24 is rotating, scan plays 1 to 30 are performed from the distance device.
When the AF multiplied signal is output, the magnet 27 is de-energized and the claw plate 26 is released. The claw plate 26 is pulled by the splinter 28, rotates counterclockwise, and is held at either distance i'A or 124b of the distance swivel 24. Therefore, the distance stopper 24 stops at a position corresponding to the shooting distance detected by the distance measuring device.

When the rotation of the distance stopper 240 is stopped, the movement of the scan plate 30 is forcibly stopped because the interlocking bin 34 acts as a stopper. Therefore, this scan plate 30 moves by a distance corresponding to the photographing distance, and by moving the second objective lens 13 up and down in accordance with this moving distance, the field of view of the finder 3 is changed and vararax is corrected. That is, the second objective lens 13
starts from approximately the intermediate distance position, moves to the short distance position where it has moved most upwardly, and then starts moving toward the far distance position where it has moved most downward, and is positioned between these positions. Therefore, the viewing frame 15a and the distance measuring frame 15b
The image stops while being displaced from the position shown in FIG. 3(B) toward the position shown in FIG. 4(B), and the vertical variation of the field of view is corrected.

Next, the field of view frame 15a was moved to correct vararax.
The photographic range is confirmed from the position of the image 15a', and if the subject is shifted, the direction of the camera is adjusted to determine the composition. Next, after checking the photographing information displayed in the finder 3 and confirming that there is no problem with photographing, the user presses the release button 7 to the rear position. As a result, the protruding piece 41b of the release lever 41 rotates the release lever 22 counterclockwise to disengage it from the lens extension amount setting ring 21. The lens extension amount setting ring 21 starts to rotate counterclockwise under the tension of the spring 23, and one of the teeth 21a provided on the outer circumference of the ring 21 engages the locking piece 2.
It stops at 1δ when it reaches 4a. This rotation of the lens extension amount setting ring 21 is transmitted to the movable mirror ↑θjlO via the interlocking pin 20, and the lens system 9 is extended while being held to adjust the focus. In addition, this focus
After the 11th section, the tsuyatsuta is activated and the film is exposed. In addition, after the 1i shadow, as is well known, the movable mirror i#i 1
0, claw plate 26, scan play] and 30 etc. are returned in conjunction with the second.

In the above embodiment, the setting position of the finder field of view of the prefocus l'iij is set at an intermediate distance (3 m), but the setting position is not limited to this, and may be set at a long distance or a short distance. Of course, in this case, it is necessary to make the two correspond so that the position the distance measuring device is looking at falls within the distance measuring frame. Further, in the above embodiment, the second objective lens 13 is moved, but this may be a structure in which the first objective lens 12 is moved. Further, when a convex lens is used as the objective lens, the convex lens is moved in the opposite direction to that in the above embodiment using a concave lens.

[Second Embodiment] FIGS. 6 to 8 show another embodiment of the present invention. In FIG. 6, the finder 50 includes a first objective lens 51, a second objective lens 52, and a half mirror 5.
3, a field frame plate 54 forming a field frame 54a,
It is composed of an eyepiece lens 55 forming a distance measuring frame 55a, and a field frame plate 54 moves up and down depending on the photographing distance. Before prefocusing, this field frame plate 54 has an image 5 of the field frame 54a, as shown in FIG. 7(A).
4a° is located at the center of the field of view. Then, as shown in FIG. 7(B), the image 54a° of the field of view frame 54a moves from the short distance position in the direction of FIG.
), the image 54a' of the field of view frame 54a is displaced between upwardly moved distant positions.

FIG. 8 shows the configuration of the main parts of the present invention, and the same parts as those shown in FIG. 5 are given the same reference numerals.

A cam follower 36 is fixed to the lower part of the field frame plate 54, and the field frame plate 54 is moved by -1° by following the balax correction cam 30C of the scan plate 30.
Move to. In this embodiment, since the field frame plate 1 54 is moved, the vararax correction cam 30C has a shape that is opposite to that shown in FIG.

Note that since the distance measuring frame 55a is formed on the eyepiece lens 55, it does not displace even if the scan plates 1 and 30 move.

〔effect〕

In the present invention having the above configuration, the objective lens of the finder or the field frame plate is moved in conjunction with the scan plate that moves during prefocus.
Vararax can be automatically corrected at all shooting distances.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the O1-focus camera of the present invention. FIG. 2 is an optical path diagram showing the optical system of the finder of the present invention. FIG. 3 shows the viewfinder field of view before and after prefocusing when the subject is located at a short distance. FIG. 4 shows the viewfinder field of view before and after prefocusing when the subject is located at a long distance. FIG. 5 is a perspective view showing an apparatus for carrying out the invention. FIG. 6 is an optical path diagram of a finder showing an embodiment in which a field frame plate moves. FIG. 7 is an explanatory diagram showing changes in the field of view when the field frame plate moves. FIG. 8 is a front view showing the main parts of a device for moving the field frame play I. 2...Photographing lens 3...Finder 4.5...
Rangefinder window 7...Release lever 8...Fixed lens barrel
9...Photographing lens system 10...Movable lens barrel 12.13
...Objective lens 14...Half mirror 15...Eyepiece lens 15a...Field frame 15b...Distance measurement frame 21...Lens extension amount setting link 24...Distance stomper 30...Scan play 1. 30a...Cam for distance adjustment 30b...Cam for parallax correction 36...Cam follower 1/no 41...Release lever 51, 52...Objective lens 53...Half mirror 54...Field frame play 154a...・Visual field frame 55...
Objective lens 55a...Distance measuring frame 30c...Cam for parallax correction. Figure 3 Figure 4

Claims (4)

[Claims] (1) Equipped with a finder and a distance measuring device, distance measurement is performed before the release operation, a scan plate is displaced according to the obtained shooting distance, and a photograph is taken after the release operation according to the amount of displacement of the scan plate. In an autofocus camera that controls lens extension, the optical element of the finder is moved in a direction perpendicular to the optical axis according to the amount of displacement of the scan plate, and the image position of the field frame is changed to correct parallax. A parallax correction device characterized by: (2) The parallax according to claim 1, wherein a cam for parallax correction is formed on the scan plate, and the optical element is attached to a cam follower that follows the cam. Lux correction device. (3) The parallax correction device according to claim 1 or 2, wherein the optical element is an objective lens of a finder. (4) The parallax correction device according to claim 1 or 2, wherein the optical element is a field frame play 1.