JPH0882832A - Camera provided with finder device - Google Patents

Abstract

PURPOSE: To prevent display in a finder from being complicated without making the size of a camera large by using the same member as the parallax correction display means and panoramic display means of a finder. CONSTITUTION: First and second blades 201 and 202 for changing the visual field range of the full size of the finder are provided with projected rail parts 201a and 202a and they are inserted into the groove of a finder main body 203 and can be vertically moved. When the pinion gear 208 of a stepping motor 207 is rotated clockwise, a rotary rind 206 is rotated counterclockwise. The first blade 201 is moved downward by a dowel part 206a and enters into the visual field of the full size 209, to enable a short-distance parallax correction. Moreover, when the rotary ring 206 is rotated clockwise by the stepping motor 208, the part 202b of the second blade 202 is pushed upward by the dowel part 206a of the rotary ring 206 and a part 201c is pushed by the dowel part of a part 206c, to push the first blade 201 downward and obtain a panoramic state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a finder device for a camera capable of taking panoramic photographs.

[0002]

2. Description of the Related Art A so-called TTL, which has a structure in which a light flux passing through a taking lens is guided to a finder system through a half mirror like a viewfinder of a single-lens reflex camera.
In the case of the viewfinder, the shooting screen and the viewfinder screen of the viewfinder are always the same regardless of the distance to the subject. However, in the case of another viewfinder other than the TTL viewfinder,
In particular, at a short distance, there is a difference between the range seen by the viewfinder and the range actually shot. This is a phenomenon that occurs when the optical axis of the finder optical system and the optical axis of the taking lens are separated, and is called parallax. Conventionally, various methods of correcting this parallax have been taken, for example, the field of view frame automatically moves in the field of view in conjunction with the shooting distance to correct parallax, or the parallax correction mark for short-distance shooting is provided. There are things attached.

On the other hand, in recent years, there are commercially available cameras capable of selecting a panoramic size photograph having different photograph sizes by changing the enlargement magnification of the photograph in addition to the usual full size photograph. In the case of this camera capable of switching the middle of the panorama, the visual field range of the panoramic photograph is narrower in the upper and lower sides compared to the visual field range of the full size photograph, and therefore it is necessary to display something in the viewfinder.
Therefore, there is a type in which a mark indicating the panoramic range is always displayed as a display in the viewfinder, or a panoramic field mask indicating the range is inserted in the viewfinder field when switching to the panorama.

[0004]

However, in the above-mentioned conventional example, the display means for indicating the parallax correction range and the display means for indicating the panoramic field of view are separately provided, and the viewfinder portion of the camera becomes large, or the display method is changed. It was complicated.

In view of the above problems, the present invention is to provide a camera having a viewfinder device without increasing the size of the camera and complicating the display in the viewfinder.

[0006]

In order to achieve the above object, the same member is used for the parallax correction display means and the panorama display means of the finder with a simple structure, thereby making the display cumbersome and simplifying the display section. The size of the viewfinder display can be reduced.

[0007]

【Example】

(First Embodiment) FIG. 4 shows an optical system of a real image type finder using a liquid crystal for finder display. 401-40
Reference numeral 3 denotes a first to third objective lens, which is a third objective lens 40.
Reference numeral 3 is fixed, and the first objective lens 401 and the second objective lens 402 move the finder optical axis 409 back and forth, so that the viewfinder can be magnified. A first prism 404 reflects the light from the objective lens on the total reflection surface of 404a and bends it sideways. Reference numeral 405 denotes a liquid crystal plate, and polarizing plates 405a and 405b are attached to the front and back surfaces of the liquid crystal plate 405, respectively. An image of the subject is formed on the liquid crystal surface by the objective lens, and an image which is energized by the liquid crystal and overlaps with the displayed pattern becomes an erect image by the second prism 407 and is magnified and observed by the eyepiece lens 408. It will be.

FIG. 1 is a view of a scene excluding the viewfinder of a camera. (A) is a case where a close-up flower is taken in close-up, and (b) is a case where a panoramic image is taken of a distant landscape. (A) shows a state in which the portion of the finder is hidden because the finder parallax causes the upper portion of the finder to be out of the photographing range because the flowers are close to each other. Further, (b) is a diagram in which the outside of the photographing range is hidden because it is a panoramic photographing. A mechanism that also serves as a display member of the finder in both cases will be described with reference to FIG. Reference numerals 201 and 202 denote a first blade and a second blade for changing the field of view of the finder full size 101. This first blade 201,
The second blade 202 has protruding rail portions 201a and 202a, and these protruding portions enter the groove of the finder body 203 and can move in the vertical direction. The first blade 201 is always biased upward by the spring 204 and the second blade 202 is negatively biased downward by the spring 205, and the blades are in contact with the stoppers 203a and 203b of the finder body. The rotating ring 206 rotates around 206a,
A first blade 201 is arranged on the front side of this rotating ring, and a second blade 202 is arranged on the other side thereof. The rotating ring 206 has dowels 206b and 206c, and the dowel 206b has protrusions on the front and back of the rotating ring 206.

The rotary ring 206 has a gear portion 206d, and a pinion gear 207 meshes with the gear portion 206d. By energizing the step motor 208, the rotary ring 206 rotates left and right. FIG. 2A shows the state of the full-sized first blade 201 and the second blade 202.

The pinion gear 20 of the step motor 207
When 8 rotates right, the rotating ring 206 rotates counterclockwise. The first blade 201 is moved downward by the dowel portion 206d and comes into the field of view of the full size 209. This enables short range parallax correction.

It is also possible to change the parallax correction amount according to the subject distance by controlling the energizing pulse of the step motor 208.

On the other hand, when the rotating ring 206 is rotated clockwise by the step motor 208, the second blade 202 is rotated by 20.
2b is pushed upward by the dowel portion 206d of the rotating ring 206. At the same time, the 201c portion is pushed by the dowel portion of 206c and the first blade 201 is pushed downward, resulting in a panoramic state.

(Second Embodiment) 301 and 302 are blades 1 and 2 for changing the visual field range of the visual field 101 of the finder full size. The first blade 301 and the second blade 302 are provided with protrusions 301a, 301b, 302a, 3 respectively.
02b, and the protrusions enter the groove portions 305a (four places) of the finder body 305 (not shown), and both the first blade and the second blade can slide in the vertical direction in the figure. Three
Reference numeral 03 denotes a cam plate that can move left and right, and has two first cam grooves 303a and second cam grooves 303b.

The cam plate 303 has a rack portion 303c and meshes with the pinion gear 304.

By energizing the step motor 306, the cam plate 303 moves left and right, and by controlling the energizing pulse of the step motor 306, the position of the cam plate can be accurately stopped.

FIG. 3A shows a full size state. In the full size state, the full size visual field 201 is visible. FIG. 9B is a diagram in the case where the subject is a short size and is full size. In this case, the blades act as a parallax correction mechanism, and the cam plate 30 is activated by energizing the step motor 306.
3 moves to the left, and only the first blade 301 comes into the full-size field of view by the cam groove 303a. However, at this time, since the second cam groove 303b is a groove in the same direction as the moving direction of the cam plate, the second blade 302 does not move in the vertical direction at all. At this time, it is also possible to control the parallax correction amount by controlling the number of energizing pulses of the step motor. Further, when the step motor 306 is energized, the first blade 301 does not move up and down because the first cam groove 303a is in the same direction as the moving direction of the cam plate 303. However, since the second cam groove 303b rises to the right, when the cam plate moves to the left, the second blade 302 moves upward and enters the state of (c), that is, the panoramic state. Therefore,
When you make a panorama from a full size and not close distance,
First upper blade 301 is lowered first, then second blade 3
02 starts to rise. First blade 301 and second blade 3
02 does not come in at the same time, but it does not matter as a panoramic display. Also, parallax correction can be displayed by using the process of panoramic display. When the step motor is further energized from the state of (c), the first cam groove 303a,
Since the second cam groove 303b extends to the lower right, the first blade 301 and the second blade 302 move downward while maintaining the same distance h. That is, by controlling the number of steps of the step motor as described above, parallax correction in a panoramic state according to the subject distance becomes possible.

FIG. 5 shows a camera incorporating the finder device of the present invention. A shooting lens barrel 501 has a viewfinder window 502 directly above the optical axis of the shooting lens, and an infrared emission window 503 and an AF light receiving window 504. FIG. 6 is a block diagram of the circuit configuration of the camera.

Reference numeral 601 denotes a camera power supply battery, 602 a power supply holding circuit for supplying a predetermined power supply voltage to each part of the camera, 6
Reference numeral 03 is a camera control microcomputer, and 604 is a release button 50.
It is a start switch interlocking with 5. When the release button 505 is pressed, the start switch 604 turns on and the power supply holding circuit 60
Reference numeral 2 supplies a predetermined power supply voltage to the control microcomputer 603. The control microcomputer 603 outputs a self-holding signal to the power supply holding circuit 602 and controls the power supply by the control microcomputer 603 itself so that the control microcomputer 603 maintains the operating state even if the start switch 604 is turned off.

Reference numeral 605 denotes an infrared light emitting circuit for emitting distance measuring infrared light from an infrared light emitting window 503 provided on the upper front surface of the camera body, and 606 an infrared light receiving window 504 for receiving infrared reflected light from a subject. The AF control circuit outputs distance measurement data according to the subject distance. Based on the output result from the AF control circuit to the microcomputer, the microcomputer 603 is output to the step motor control circuit 607 and the step motor 306
Will be driven.

(Third Embodiment) Reference numerals 701 and 702 are blades 3 and 4 for changing the visual field range of a visual field 703 of the finder full size. The first blade 701 and the second blade 702 are respectively provided with protrusions 701a, 701b, 702a, 7a.
02b, and the projections enter the groove portions 705a (four places) of the finder body 705 (not shown) and the first blade,
Both the second blade and the second blade can slide vertically. 706
Is a rotating ring that can rotate left and right around the finder optical axis. FIG. 6A is a diagram showing the positional relationship between the first and second blades 701 and 702 and the rotating ring in the full size state. FIG. 7B is a diagram showing a state of the rotating ring 706. The dowel 702c of the second blade 702 enters the groove 706a of the rotating ring 706, and the first blade 70
The first dowel portion 701c is in contact with the end portion 706b of the rotating ring.

The first blade 701 is always biased upward in the drawing by the elastic member 707. The second blade 70
2 has a rack portion 702d and meshes with a pinion gear 708, and this pinion gear is attached to a step motor 709. The rotation of this step motor 709 causes the first blade 701 to mesh with the pinion gear 708.
Slides up and down.

Step motor 709 from full size state
When is rotated rightward, the first blade 701 is translated downward. As a result, the dowel portion 7 of the first blade 701 is formed.
02c enters the groove portion 706a of the rotating ring 706, so that the rotating ring 706 rotates counterclockwise.

Then, the upper portion 702e of the first blade 702
Enters the viewfinder field 703, and the upper part of the viewfinder is hidden. At this time, similarly to the above, the microcomputer 603 is output to the step motor control circuit 607 based on the output result from the AF control circuit 606 which outputs the distance measurement data according to the subject distance to the step motor control circuit 607 to control the pulse of the step motor 709. . That is, to what extent the first blade 701 enters the viewfinder field 703 is determined according to the distance to the subject. At this time, since the dowel 701c of the second blade 702 enters the groove 706c of the rotating ring, there is no movement by the rotating ring, and the elastic member 7
07 by the stopper part 705b of the finder body
Is stopped by.

Next, when the panorama switch Ps608 is turned on, the step motor 709 reversely rotates the step motor control circuit from the microcomputer 603, the second blade 702 moves upward, and in conjunction with this, the rotary ring 706 is rotated.
Rotates clockwise, the groove 706b of the rotating ring 706 presses the dowel 701c of the first blade 701, and the first blade 701 slides downward. As a result, the panorama display of the viewfinder is displayed.

[0025]

According to the first aspect of the present invention, when the finder parallax is provided and the panoramic view switching is provided, a part of the finder visual field changing means also serves as the finder parallax display means so that both are separated. It is possible to realize both functions with a simple configuration without using as a mechanism of.

According to the second aspect of the present invention, the first light blocking member for changing the field of view of the finder enters the field of view and then the second light blocking member enters the field of view, so that only the first light blocking member is included. When is within the field of view, parallax display is possible, and when the first and second light shielding members are within the field of view, panoramic display is possible.

In the third aspect, the first light-shielding member for parallax display is the light-shielding member of the finder far from the taking lens.

According to the fourth aspect of the invention, the light blocking members are easily interlocked with each other by the rotation of the rotating member, and the position of each light blocking member can be changed by controlling the rotation angle.

According to the fifth aspect of the present invention, the position of the light shielding member can be sequentially controlled only by rotating the rotating member in the same rotation direction.

According to the sixth aspect of the present invention, the first rotation angle is set to the neutral position, and the second rotation angle and the third rotation angle are reversed, so that the rotation angle can be accurately controlled. it can.

In the seventh aspect, the light-blocking member that moves at the second rotation angle for realizing the fourth aspect is a light-blocking member on the finder that is located far from the taking lens.

[Brief description of drawings]

FIG. 1 is a diagram showing (a) a close-range flower and (b) a distant scene in a scene excluding a camera finder of the present invention.

FIG. 2 is a diagram showing a first embodiment of the finder of the present invention.

FIG. 3 is a diagram showing a second embodiment of the finder of the present invention.

FIG. 4 is a diagram showing an optical system of a real image finder.

FIG. 5 is a diagram showing a camera with a built-in viewfinder according to the present invention.

FIG. 6 is a block diagram of a circuit configuration of a camera.

FIG. 7 is a diagram showing a third embodiment of the finder of the present invention.

[Explanation of symbols]

101, 209, 703 Full size field of view 701, 702, 201, 202, 301, 302 Blades 206, 706 Rotating ring 204, 205 Elastic member 303 Cam plate 606 AF control circuit 607 Step motor control circuit 208, 306, 709 Step motor

Claims (7)

[Claims] 1. A photographing range changing means for changing a photographing range of a photographing lens optical system, and a finder visual field changing means for driving a light shielding member by a driving means for changing a visual field of the finder according to the photographing range changing means. A distance measuring means for measuring the distance of the object photographed by the photographing lens optical system, and according to the object distance by the distance measuring means,
A camera having a finder device, comprising finder parallax correction display means for displaying a photographable range on a finder, wherein a part of the finder visual field changing means is used for the finder parallax correction display means. 2. A photographing range changing means for changing a photographing range of a photographing lens optical system, and a finder visual field changing means for changing a visual field of a finder according to the photographing range changing means, wherein the finder visual field changing means is driven. A plurality of light blocking members for changing the field of view of the finder driven by the means, wherein the plurality of light blocking members move the viewfinder field in parallel to change the field of view, and the first light blocking member of the plurality of light blocking members A camera having a finder device, wherein the second light shielding member enters the field of view after entering the field of view of the finder. 3. The finder device according to claim 2, wherein the first light-shielding member is a light-shielding member on the side far from the photographing lens in the direction of the base line connecting the photographing optical axis and the finder optical axis. camera. 4. A photographing range changing means for changing a photographing range of a photographing lens optical system, and a finder visual field changing means for changing a visual field of a finder according to the photographing range changing means, wherein the finder visual field changing means is a finder. A plurality of light-shielding members for changing the field of view, and a rotating member for moving the plurality of blades in parallel;
Of the first rotation angle, the second rotation angle and the third rotation angle of
At the rotation angle of, all the light blocking members are out of the viewfinder field, and at the second rotation angle, only one light blocking member moves,
A camera having a viewfinder device, wherein a plurality of light blocking members move and enter a viewfinder field at a third rotation angle. 5. The built-in camera according to claim 4, which has a finder having second and third rotation angles in the same rotation direction from the first rotation angle. 6. The built-in camera according to claim 4, which has a finder having a third rotation angle in a direction opposite to the second rotation angle with the first rotation angle as a boundary. 7. The light-blocking member that moves at the second rotation angle according to claim 4, is a light-blocking member on the side of the viewfinder that is far from the shooting lens in the direction of the base line connecting the shooting optical axis and the viewfinder optical axis. A camera having a finder device characterized by.