JP2003222937A - Camera having range-finding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camera having a range-finding device capable of compensating parallax by improving troublesome operability without complicating constitution. <P>SOLUTION: The distances of a plurality of range-finding points within the field range of a finder are detected by a multi AF circuit 18 in response to the operation of 1st and 2nd release switches 11 and 12 by a switch input part 13. Then, focusing is performed by a CPU 10 based on the result of range- finding by the circuit 18. The field range of the finder is changed by a finder shift mechanism 17 so that a photographing range by a photographic optical system may be aligned with a range observed by the finder. The mechanism 17 changes the field range of the finder based on the result of the detection by the circuit 18. If it is a state where the switches 11 and 12 are pushed after focusing, the field after the change is maintained. <P>COPYRIGHT: (C)2003,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] The present invention relates to a photographing optical system,
An optical system different from the photographing optical system is different,
Rangefinder that automatically corrects the parallax of the flash shutter camera
The present invention relates to a camera having an arrangement. [0002] 2. Description of the Related Art Conventionally used lens shutters
Camera is a file system completely separate from the optics of the taking lens.
It has a finder device comprising a finder optical system. FIG. 11 shows the lens shutter type camera.
An example is shown. In the figure, the camera body 1
In contrast, the finder device 2 and the taking lens 3
Are provided at positions apart from each other. for that reason,
The subject viewed in the shooting frame through the finder device 2
(Finder image) and the subject actually shot
It shifts as shown in FIG. 12 due to lux
There was a problem. [0004] For example, as shown in FIG.
When taking a picture of the flower 4 as a subject in the
The optical axis OF of the camera is parallel to the optical axis
At a position shifted by the distance FL between the
The viewfinder looks as shown in Fig. 12 (b).
, The photographed image is as shown in FIG.
Become. Therefore, the photographer can
You cannot take more photos. Therefore, as shown in FIG.
From the distance L and the distance FL between the viewfinder and the taking lens.
The viewfinder, and tilt the viewfinder by θ to view the viewfinder.
To match what the lens is looking at
Techniques for doing so are widely known. This is, for example,
Using the Kyle (Drehkeil) prism,
There is no known camera parallax correction device for setting.
(For example, see Patent Document 1). A distance measuring device (autofocus; A
F) Distance measurement on the optical axis different from the viewfinder or taking lens
Camera that moves between the viewfinder and AF
And the same principle causes a view through the viewfinder.
Point and the point to be measured may be different.
Was. [0007] A parallax correction device according to Patent Document 1 described above.
In order to solve this, the finder optical system
A configuration for performing distance measurement is disclosed. [0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 1-147439 [0009] SUMMARY OF THE INVENTION
Incorporating a distance measuring device in the camera complicates its structure,
It is necessary to separate the optical path between the viewfinder connection section and the distance measurement section.
From the viewfinder view and the S / N degradation of the distance measurement system
It was easy to follow. Further, the finder is switched by distance measurement.
It is necessary for the photographer to recompose the composition,
Sometimes, the distance to the subject may change.
Was. Further, parallax according to the above-mentioned Patent Document 1
In the correction device, the release button is
The button for re-ranging was provided.
When the viewfinder is switched, the operator is very troublesome during operation.
It had to be a formidable task. [0012] Also, after shooting by switching the finder,
If you reset the viewfinder, the
The same operation is repeated when shooting again at the
And the operation is cumbersome. [0013] The above-mentioned Patent Document 2 discloses a finder and a photographing device.
What about parallax that occurs between the shadow lens
It has not been overlooked. The present invention has been made in view of the above problems.
The configuration is not complicated, and the troublesome operability is improved and the
Provided is a camera having a distance measuring device for performing lux correction
The porpose is to do. [0015] That is, the present invention provides an
Observing the subject with an optical axis different from the optical axis of the shadow optical system
In response to the operation of the finder and release switch,
Distances for multiple ranging points within the viewfinder field of view
Distance measuring means for detecting separation, and a distance measuring result based on the distance measuring result of the distance measuring means.
Focusing means for focusing on the
Observation with the shooting range by the shadow optical system and the above finder
Field of view of the finder to match the range
And visual field changing means for changing the range.
The adjusting means is based on the detection result of the distance measuring means.
Change the visual field range and set the pin
After the alignment, press the release switch
Maintenance of the field of view after the above change
Sign. A camera having a distance measuring apparatus according to the present invention
In some cases, the fine axis has an optical axis different from the optical axis of the imaging optical system.
The subject is observed by the
In response to the operation of the zoom switch
Are detected for a plurality of ranging points. Soshi
Focus based on the distance measurement result
Focusing is performed by means. Also, the above shooting
Observed by the finder and the finder
Range changing means so that the
The view range of the finder is changed. View change
Means for determining a finder based on the detection result of the distance measuring means.
The field of view is changed, and the pin
After the alignment, press the release switch
In this case, the changed visual field is maintained. [0017] BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment will be described. FIG. 1 shows a camera having a distance measuring apparatus according to the present invention.
This is an outline of the camera, and shows the first model applied to the camera.
It is a block diagram showing an embodiment. In FIG.
The control circuit (CPU) 10 is a one-chip micro
And the like. In this CPU 10
Are two shutters that open and close in response to the camera's release operation.
With the release switches 11 and 12 connected,
A switch input unit 13 composed of an interface circuit and the like.
ing. The release switch 11 is provided with a release (not shown).
The release button 12 is closed by pressing the release button halfway.
Close by pressing the release button. These release switches
11 and 12 are first (1st) release
Switch and second (2nd) release switch
Called. The CPU 10 includes a switch input unit 13
In addition, each switch supplied from the switch input unit 13 is turned on.
A timer unit 14 for measuring force timing, and the timer unit 14
Controls the finder shift mechanism 17 according to the signal from
A shift control unit 15 and a point switching unit 16
ing. The finder shift mechanism 17 is a finder shift mechanism.
This is for switching the optical axis.
More controlled. Further, the multi AF circuit 18
It is a circuit that can measure the distance of multiple points in the plane, and the CPU
Switching of ranging points by the point switching unit 16 in 10
The exchange is controlled. In such a configuration, the switch input section
13 First release and 2nd release
When on / off of switches 11 and 12 is detected, each switch is turned on.
The switch input timing is detected by the timer unit 14.
You. According to the timing detection result, the CPU 10
The shift of the finder shift mechanism 17 through the shift control unit 15
Control the movement and switch the optical axis of the viewfinder. And
In response to an instruction from the point switching unit 16, the multi AF circuit 18
Measures the subject distance at a plurality of points in the screen. Also, the CPU 10 controls the multi-AF circuit.
18 outputs, first release and second release
Fine switch depending on the input state of the switches 11 and 12.
Control of the shift mechanism 17 and restart of the multi-AF circuit 18.
Control is exercised. FIG. 2 has the distance measuring device shown in FIG.
2 shows a specific configuration example of a camera. The infrared light emitting diode (IRED) 23
Projecting distance-measuring light to the subject via the projection lens 24
And is attached to the movable member 25. This movable
The member 25 includes a motor 26, a feed screw 27, and a motor 2
8. With the power of the feed screw 29, the rail 30 and
2 and 31 can be scanned two-dimensionally. Scya
The position of the mirror is the minute reflection optics
Depending on the system, part of the distance measurement light is converted to a two-dimensional light position detection element
(PSD) 32 so that it can be detected by the position of incidence
It has become. The optical position detection circuit 33 outputs the PSD 32
It is an analog circuit that detects a light position from a force signal. The CPU 10 includes an IRED driver 34,
Via the data drivers 35, 36, 37
The ED 23 and the motors 26, 28, 38 are driven. Also,
The CPU 10 detects the light position of the light position detection circuit 33.
Monitoring the result, through the motor drivers 35 and 36
To rotate the motors 26 and 28,
Change the position. Each time the position of the IRED 23 changes, the CPU
10 issues the IRED 23 via the IRED driver 34.
Light for different distances on the photo screen.
Project. A mechanism for moving the optical axis of the finder
Is basically the same as the scanning mechanism of IRED23.
It is. CPU 10 is connected via a motor driver 37
The motor 38 is driven to rotate. Then, the feed screw 39
Therefore, shift lens 1 paired with shift lens 196a
96b is shifted. This shift lens 196b
The normal position is an initial position switch connected to the CPU 10.
The shift by a predetermined amount is detected by
It is controlled by the motor speed from switch-off. The image projected from the IRED 23 is
Therefore, the reflected distance measuring light is transmitted from the projection lens 24 to the base line.
Via the light receiving lens 41 provided at a position separated by a long distance
The light is received and incident on the light position detecting element (PSD).
You. This PSD 42 is different from the above PSD 32 in that
A one-dimensional one that can detect only the line length direction may be used. As described above, the known light projection type triangulation device is used.
Configuration, the output of PSD 42 is used for optical position detection.
By calculating the ratio by the output circuit 43, the subject distance is calculated.
Can be calculated. In the light position detection circuit 43, a preamplifier
44 and 45 are current signals of two outputs of the PSD 42
I₁, I_TwoAnd amplify the compression diodes 46, 4
7 serves to feed the respective amplified signals. And ba
The buffer circuits 48 and 49 have a reference voltage V_refI for criteria₁,
I_TwoIs compressed by a pair of NPN transistors 5
Input to the base of 0,51. The emitters of the transistors 50 and 51 are common
And the constant voltage source 52 is connected as shown in the figure.
You. Here, the constant current of the constant current source 52 is represented by I₀Then
Collector current I flowing through transistor 50_INTIs         I_INT= (I₁/ (I₁+ I_Two)) I₀                … (1) And PSD42 output I₁And (I₁+ I_Two) Ratio
You can see the example. Therefore, before the light emission of the IRED 23
Switch 54 from ON to OFF, and collects the transistor 50
Output voltage V of the integrating capacitor 53 connected to the_INTTo
Initialized, constant current synchronized with light emission of IRED23
When the source 52 is turned on for a predetermined time, the integration capacitor 53
Is the voltage V proportional to the above equation (1)_INTIs output. The CPU 10_INTThe built-in A / D converter
The data is converted into a digital value and input by the converter. The principle of triangulation and the output of PSD42
I₁, I_TwoFrom this relationship, this V_INTIs the distance L         V_INT= A1 ((I1 / (I1 + I2)) I0)               = A2 · 1 / L (2)                 A₁, A_Two: Proportional constant Take the relationship. Based on this relationship, the CPU 10
V found at Can Point_INTCalculate distance L
Put out. It should be noted that the output of PSD 32
A light position detection circuit 33 for detecting a scan position, basically
Assumes such a circuit configuration. Also, the CPU 10 is required to press a release button.
The first release that turns on during and after pressing
Switch 11 and the second release switch 12
Has been continued. Further, the focusing circuit 55 includes a CPU
10 and is controlled according to the result of distance measurement.
The focus of the lens is adjusted. Make sure the shooting lens
Zoom position during shooting, the focus (f) detection time
It is detected by the road 56 and input to the CPU 10. Next, the flowchart of FIG. 3 and FIGS.
Referring to FIG. 8, the operation of the first embodiment of the present invention will be described.
explain. First, in step S1, a camera release is performed.
First release switch to detect the half-pressed state of the button
It is detected whether the switch 11 is detected. Where
When the release switch 11 is turned on,
Proceeding to step S2, the CPU built in the CPU 10
The mask unit 14 is reset. Next, in step S3
Then, a plurality of points in the screen are
The subject distance is measured. This multi AF is as shown in FIG.
To a plurality of ranging points 20 in the finder 19
This is a technique for measuring distance. For example, a mirror or ranging unit
Scans the entire area and measures the distance.
There is a widely known technique for measuring the distance while switching the distance. In step S4, the process in step S3
Based on the distance measurement result, the main subject distance L ₁And the distance
The measured ranging point is selected. This selection method
Select the data that indicates the closest distance,
The closest selection may be used, or the subject in the center of the screen may be given priority,
A so-called central point may be used. Also, as shown in FIG.
In addition, AF that can obtain distance measurement data continuously in position
In this case, the distance measuring points obtained as shown in FIG.
From the graph of the distance P and the distance L,
A detection method may be used. For example, a composition as shown in FIG.
In the case of, the subject is a rough subject more than the person 21 which is the main subject.
If the tree 22 is close, a simple closest selection
The branch is in focus and person 21 is out of focus
In other words, it was sometimes out of focus. However, as shown in FIG.
When the data is graphed, the point P₀Ranging of tree branches
The data is compared with the shoulder width of a typical subject
Is not the result of measuring the distance of the person
You. On the other hand, point P₁Is the same width that outputs the same distance Δ
From P, the data should be suitable for focusing.
I understand. Thus, in step S4, the main
Subject distance L₁And its position P₁Ask for. Next, in step S5, the second relay
Pressing the release button from the release switch 12, that is, shooting
It is detected whether or not it is time for the user to take a picture.
At this time, the second release switch 12 is turned off.
If there is, the process branches to step S6, and again
The detection of the phase switch 11 is performed. In this step S6, the first
When the release switch 11 is turned off, the photographer
Is returned to step S1. On the other hand,
The first release switch 11 is turned on at step S6.
If so, the process proceeds to step S7 and the CPU 10
The timer unit 14 counts. Then, step S8
The timer count result T is less than 0.5 seconds
It is determined whether or not. Here, the timer count result T is 0.5 seconds.
If smaller, the process returns to step S5. Against this
Then, in step S5, the photographer carefully composes the composition.
The timer section 14 counts up,
In steps S8 and S9, the selected L₁And Figure 11
And the distance F between the finder and the taking lens shown in FIG.
From L,         θ = arctan (FL / L₁…… (3) Is controlled to tilt the finder optical axis. This
The optical axis control of the finder is as shown in FIG.
A finder with a simple configuration is assumed. In FIG. 6A, reference numeral 191 denotes a finder.
192 is a loupe. Soshi
Between the objective lens 193 and the loupe 192
Is provided with a first prism 194 and a second prism 195
Has been. Also, the first prism of the second prism 195
On the side, an intermediate image plane 199 is formed. The objective lens 193 includes lenses 196, 1
97, 198. These three groups of lenses
By controlling the positions of the holes 196, 197, 198,
Can now respond to zooming of the shooting lens
I have. The first group of lenses is a shift lens 196
a and 196b, and the shift lens 196b
By shifting in the direction of the illustrated arrow, the above (3)
Θ in the equation can be controlled. Therefore, the distance L₁And the reciprocal of
The relationship between the lens shift amounts is as shown in FIG.
In step S10, the CPU 10 determines the distance measurement result L
₁The shift amount is calculated according to. And according to this result
Therefore, the shift is performed via an actuator such as the motor 38.
Performs lens shift control. By the way, the finder screen is
Is switched, a problem as shown in FIG. 7 occurs.
Live. FIG. 7A shows a file before the release button is half-pressed.
3 shows a screen inside the indah 19. But above
FIG. 7 (b) shows the broken line
Are visible, and the range 19a indicated by the solid line is partially
I can only see it. Actually, the photographable range at this distance is 19
b, the photographer holds the camera by the angle θ.
The object distance changes at this time.
There is. Therefore, it is better to measure the distance again immediately before shooting
Desirable, but since the camera has been repositioned,
The ranging point 20 that was present in the center of the plane is
Is the upper part of the screen in proportion to θ as shown in FIG.
Will shift. Even if the distance is measured at this point,
Cannot be adjusted, and the distance must be measured downward by θ.
No. Therefore, in step S11, this θ and the main
Subject position P₁Ranging points for re-ranging
P_TwoIs required. Referring to FIG. 8, the light for distance measurement is tilted by φ.
A method for projecting will be described. A general lens shutter camera is used for distance measurement.
Light is projected toward the subject, and the reflected signal light from the subject
Therefore, the subject distance is obtained. Therefore, the distance measuring light
The point where is projected is the distance measurement point. On the other hand, in FIG.
A state where the distance measuring light is projected through the light projecting lens 24 is shown.
ing. Here, f_TIs the focal length of the projection lens 24
It is. As shown in FIG.
When the light is emitted at the position, the projection direction φ of the distance measuring light is IR
ED position difference Δx and focal length f_TThan         φ = arctan (Δx / f_T…… (4) Is set by Therefore, by controlling Δx,
It is possible to control the ranging points. That is, here
Calculate Δx as the result of equation (4) shows θ, and
The IRED may be projected from the position. FIG. 5 (c) shows a first release switch.
And the position 20 measured at the timing of the
Side of the screen showing the relationship between the distance measurement positions 20a determined in Step 1
The coordinate of the direction is P₁And the vertical direction is
The distance of the point shifted in relation is measured. The finder switched in this way
The photographing is performed while watching. In step S5, the release switch
When the switch is pushed in, the process proceeds to step S12,
The result of the counting is compared with a predetermined value. As a result
If it is longer than one second, the photographer re-holds the camera.
It is determined that the possibility is high, and the process branches to step S13. one
In step S12, the timer count result T is 1 second.
If it is shorter, the process proceeds to step S16 and L₁Focus on
Then, the process proceeds to an exposure sequence. In step S13, the first release
Distance measurement result L when switch 11 is on ₁Is a predetermined distance 2
m. The distance measurement result L₁Is from this distance 2m
If it is far away, the change in distance due to re-holding can be ignored.
Then, the process branches to step S16. Conversely, if it is less than 2m
Says that the change in distance due to the photographer's
Then, the process proceeds to step S14, and in step S11,
Determined position P_TwoIs measured. Next, in step S15, the above steps are performed.
Distance measurement result L obtained in step S14 _TwoIs the focusing distance
It is separated. Then, in the following step S16, this distance is set.
Focusing is performed at a distance. Thus, in step S16, focus is achieved.
And exposure is performed in step S17.
First release switch 11 in step S18
It is detected whether or not is pressed. Here, turn off
The process proceeds to step S19, based on the viewfinder.
I will put it back. This allows the viewfinder to switch
Can be reduced. According to the above-described embodiment, the parallax
Take pictures as seen in the viewfinder.
Can be. In addition, the viewfinder can be changed according to the distance measurement result.
After performing the switching operation, measure the distance again just before shooting.
Then, after switching the viewfinder, the photographer holds the camera
Correcting the focus will be possible even if it is corrected. Further, in this embodiment, half of the release button
When pressed, distance measurement of multiple points on the screen (Multi AF)
However, at the time of the above distance measurement, the result of the first multi AF
Only one point determined by
Camera with less chance of missing photo opportunities
Can be provided. Note that this re-ranging is performed when re-holding is performed.
Subject distance variation is relatively small and can be ignored
It is not performed in the case of a long distance. Therefore, the condition
In some cases, the time lag is further reduced and unnecessary measurement
Side effects due to distance can be prevented. In addition, the shutter chance is prioritized.
When shooting, first release and second release
Since the switch turns on close to each other, the flow in FIG.
-Step S10 of the chart does not pass and the finder moves.
No movement is performed, so the viewfinder switches after shooting.
Troublesomeness can be avoided. Next, a second embodiment of the present invention will be described.
Will be explained. In the second embodiment, FIGS.
(C) As shown in FIG.
Lens and a light emitting / receiving lens. That is,
A photographing lens 3 and a finder device are provided on the front of the camera body 1.
2 and the projection lens 24 for AF are arranged substantially on a straight line.
Have been. A light receiving lens 4 is provided on the front of the camera body 1.
1 and a release button 57 on the top of the camera body 1.
Is provided. As described above, the finder device and each lens are
When placed, the distance measuring light scans on this straight line
Distance measurement in the center of the viewfinder and in the center of the photo screen
It becomes possible. The scanning mechanism for the distance measuring light is, for example, as shown in FIG.
The configuration is as shown in FIG. Shooting lens 3
Rail 3 in the direction connecting the indexer device 2 and the projection lens 24.
0 is placed. And it is movable along this rail 30
When the member 25 moves, the IRED 23 moves.
You. The movable member 25 is, as described above, a motor driver.
35, and is moved by the motor 26 and the feed screw 27.
You. With such a configuration, the IRED 23 is scanned.
Then, under the conditions as shown in FIG.
Distance measurement is possible for both the center of the indah and the center of the picture screen. That is, the finder device 2 and the photographing lens 3
Is the distance between FL and the distance between the taking lens 3 and the light projecting lens 24.
If the distance is AL, the projection angle φ and the distance measurement result L         Lsinφ₁= AL… (5) It is said that the distance is measured at the center of the photo screen when
I can. Also,         Lsinφ_Two= AL-FL (6) When the distance is measured at the center of the viewfinder
It can be said that. As a result of this multi-AF,
The CPU 10 determines which data is the distance measurement at the center of the screen from φ and L.
The result can be determined. Next, referring to the flowchart of FIG.
The operation of the second embodiment will be described. In addition, this
In the flowchart, some steps are described above.
Same as the flowchart of FIG.
Only the steps have been changed so that
Now, only the different steps will be described in detail. First, in steps S21 to S23,
When the subject distance is measured by the AF, step S2
At 4, the subject in the center of the viewfinder, not the main subject distance
Body distance L₁Is detected. This distance L₁Is the angle of the projection angle φ at that time.
This is the distance between which the above equation (6) holds. And Mar
Scan position of IRED23 obtained from the result of AF
(Emission angle φ) and the result of distance measurement
Distance L where equation (6) holds₁Can be selected. When the first release switch 11 is
After that, the time T until the second release switch 12 is turned on
Is detected in steps S26 and S27. Also,
In step S28, it is determined that the time T is longer than 0.5 seconds.
Then, in steps S29 and S30, parallax
The finder is switched as a countermeasure. Incidentally, in the flowchart of FIG.
3 corresponds to step S11 in the flowchart of FIG.
There is no work, especially here decides the next ranging point
Absent. This is because the embodiment uses the distance measurement point in the center of the photo screen.
When the release button is pressed, the second
Even after the release switch 12 is turned on, multi-A
This is because F is performed. Second release switch in step S5
In the processing after 12 on, if there is a finder switch,
In step S31, the process branches to step S32, and the photographing lens
Is detected. According to the focal length f, the above-described step S
Distance measurement result L at the center of the screen obtained in step 24₁Is determined
You. That is, in step S33, L is larger than 30 × f.₁
Is large, it is regarded as a long distance,
The distance error caused by re-holding the camera enters the depth of field
The process branches to step S39 as being negligible. In step S33, a short distance
If it is determined that it is separated, the process proceeds to step S34.
Multi AF is performed again. Subsequently, to step S35
In this case, as shown in FIG.
Then, the distance measurement result at the center of the screen is detected, and this is_Two
And In step S36, during the first finder
Heart distance measurement result L₁And re-ranging result L at the center of the screen_TwoCompare with
And the difference ΔL is calculated. Next, step S3
At 7, it is determined whether the difference ΔL is smaller than 5 cm.
It is. Here, if the difference ΔL is smaller than 5 cm,
Since it is considered that re-holding has been performed, step S3
Go to step 8 and re-measurement result L_TwoHas priority. Conversely,
If it is determined in step S37 that the distance is 5 cm or more, the photographer
Thinks that the camera is not holding the camera again, and the first distance measurement result L
₁Has priority. This is a state as shown in FIG.
The first release switch is turned on in the state shown in FIG.
The viewfinder switches to the state shown in (c)
However, the photographer only wants to focus
Petal existing in the center of the screen in the state shown in (b)
Is the idea. Even when the finder is switched, the photographer
If you do not re-hold the camera, the photo as shown in FIG.
You can shoot the truth, but if you give priority to the re-ranging result at this time,
The scene is in focus, the composition is different and the focus is also
It becomes a picture that there is no. Therefore, step
In S37, such a phenomenon is to be prevented. The above steps S21 to S23, S25
To S30, S31 and S39 to S42 correspond to FIG.
Steps S1 to S3, S5 to S1 in the flowchart of FIG.
0, S12, and S16 to S19.
Detailed description is omitted. As described above, according to the second embodiment,
Always in the viewfinder screen even if the viewfinder is switched
Focused on the result of measuring the center of the heart
The photographer puts the main subject in the center of the viewfinder screen.
You can take pictures with good focus just by holding
It works. [0088] As described above, according to the present invention, the configuration is
Parallax with improved complexity and less troublesome operability
It is possible to provide a camera having a distance measuring device that performs correction.
Wear.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 schematically shows a camera having a distance measuring apparatus according to the present invention, and is a block diagram showing a first embodiment applied to the camera. FIG. 2 is a diagram illustrating a specific configuration example of a camera having the distance measuring device illustrated in FIG. 1; FIG. 3 is a flowchart illustrating the operation of the first embodiment. FIG. 4 is a diagram for explaining multi-AF and showing a plurality of distance measurement points in a finder. 5 is a diagram for explaining the selection of the main object distance L ₁ and the distance measurement point whose distance is obtained. FIG. 6A is a diagram showing a configuration of a finder;
(B) is a diagram showing a shift amount of an inverse relationship with the shift lens distance L _1. FIG. 7 is a diagram showing a screen range by switching a finder screen. FIG. 8 is a diagram illustrating a method for projecting the distance measuring light by inclining by φ. FIG. 9 shows a second embodiment of the present invention.
FIG. 3 is a diagram illustrating an arrangement of a finder, a photographing lens, and a light emitting / receiving lens of the camera. FIG. 10 is a flowchart illustrating an operation according to the second embodiment. FIG. 11 is a diagram showing an example of a conventional lens shutter type camera. FIG. 12 is a diagram illustrating parallax by the camera in FIG. 11; FIG. 13 is a schematic diagram illustrating a conventional camera parallax correction device. [Description of Signs] 10 ... Operation control circuit (CPU), 11 ... First release switch, 12 ... Second release switch, 13
... Switch input unit, 14 ... Timer unit, 15 ... Shift control unit, 16 ... Point switching unit, 17 ... Finder shift mechanism, 18 ... Multi AF circuit, 19 ... Finder, 20 ...
Distance measuring points, 21: person, 22: tree, 23: infrared light emitting diode (IRED), 24: light emitting lens.

Claims (1)

Claims: 1. A finder for observing a subject along an optical axis different from the optical axis of a photographing optical system, and a plurality of distance measuring points within the finder field of view in response to an operation of a release switch. Distance measuring means for detecting the distance, focusing means for performing focusing based on the distance measurement result of the distance measuring means, and adjusting the photographing range by the photographing optical system to the range observed by the viewfinder. A field-of-view changing means for changing the field of view of the finder, wherein the field-of-view changing means changes the field of view of the finder based on the detection result of the distance measuring means, and after focusing by the focusing means, A camera having a distance measuring device, which maintains the changed visual field when the release switch is pressed. .