JP2723503B2 - Auto focus camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical field of the invention)   The present invention is an interchangeable lens with automatic focusing device
Focus detection device and focus adjustment on the camera, especially the camera body
So-called body drive type auto focus with
Related to adjustment cameras. (Background of the Invention)   For automatic focus adjustment (hereinafter abbreviated as “AF”)
Drive source to move focus detection device and lens to camera body
And a photographing lens based on the output of the focus detection device.
Cameras that perform automatic focus adjustment are known in the art.
And some suggestions for the device have already been made.
I have. Among the known proposed devices are bayonet type lasers.
For mounting and locking the shooting lens on the lens mount.
The torque of the drive source is coaxially penetrated through the center of the position regulating pin.
A coupling shaft for transmitting the
Has been released. However, in this device
Since the position regulating pin is thicker than the conventional one,
The width of the engagement groove on the matching lens side is wide, and only the special lens
Can be attached, and the conventional non-
There is a disadvantage that locking is not possible even with the AF lens attached.
Was. In addition, the special non-AF lens has a special thick position
Lockable by providing an engagement groove to engage with the restriction pin
Even if it is configured, when the position regulating pin
Switch is turned on, the motor circuit for driving the lens and the distance measurement circuit are
The relay is configured to be in the operable state.
Press the button to drive the drive motor
There was a drawback that wasted wasted.   In addition, automatic focusing can be switched between manual and automatic.
A body-driven camera with a dynamic manual switching device is also publicly available.
Is knowledge. However, in this known camera,
When attaching the lens for manual distance adjustment of
Only after setting the switching device to the manual position
Can not be attached, the handling is inconvenient,
There was a disadvantage that quick lens exchange was not possible. (Object of the invention)   The present invention solves the above-mentioned disadvantages of the conventional camera, and
Focus adjustment method is automatically selected according to the interchangeable lens
However, if the interchangeable lens is not
Stop focus adjustment to protect the internal mechanism and turn off the power.
Automatic focusing camera with interchangeable lenses to prevent wear
The purpose is to provide LA. (Summary of the Invention)   In the present invention, the lens is replaceable, and the mounted replacement lens is mounted.
A motor for driving the lens
Focusing drive of interchangeable lens by focusing
First automatic focus adjustment mode, motor that is performed continuously regardless of
Focusing drive of the interchangeable lens by
To a second auto focus mode, which stops when
Manual focus adjustment for focusing and driving interchangeable lenses
Applicable to autofocus cameras with selectable modes
Is done.   Then, insert the interchangeable lens into the lens mount on the camera side.
Locking means for locking in a predetermined position, and locking by the locking means
Lock release means for releasing the lock and motor power
Coupled to the interchangeable lens side for transmission to the lens
Coupling means, coupling means and interchangeable lens side
Between the connection position to be connected and the connection release position to release the connection
To be unlocked by the unlocking means.
Coupling connection driven to the release position in conjunction with
/ Release means and disconnection of coupling connection / release means
Moves from the auto focus mode to manual focus in conjunction with the movement to the position.
Output switching signal to point adjustment mode, coupling coupling
Manual focus adjustment in conjunction with the movement of the release / release means to the connection position
Output switching signal from mode to auto focus mode
A first switch means, a first automatic focusing mode,
2 for outputting a switching signal for the automatic focus adjustment mode
Switch means, automatic focus mode and manual focus mode.
First operation for switching between the first mode and the first mode
Switching between a focus adjustment mode and a second automatic focus adjustment mode
Is enabled, and the second operation is interlocked with the first operation.
Without operating the lock release means.
Driving the connection / release means between the connection position and the connection release position;
And the unlocking means and the
And without actuating the coupling connecting / disconnecting means
Switching means for switching the second switch means. (Example)   Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
explain.   FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG.
FIG. 3 is a perspective view of the camera body side in the embodiment of FIG. 1, and FIG.
FIG. 3 is a perspective view of the photographic lens. Figures 1 to 3
In the embodiment shown in FIG. 5, the focus for detecting the in-focus state of the subject image is
Detecting means and the optics of the taking lens based on the detection result
The drive motor for moving the system is inside the camera body.
The output of the drive motor is
Shooting level via the driving force transmission shaft provided on the lens mount.
The camera body drive system that transmits the
The present invention is applied to dynamic focus adjustment (hereinafter abbreviated as "AF").
It was done.   Bayones provided on the camera body as shown in Fig. 2
The lens mount 1 on the body side is a camera mounted on the camera as shown in FIG.
Connects to the lens-side mount 51 provided at the rear end of the shadow lens 50.
Combine. When mounting the taking lens, push the lens mount 51
When inserting into the lens mount 1 on the
Restrict the rotation position of the taking lens with respect to the camera body
Position restricting pin 2 is the coupling reference surface of camera side mount 1.
1a is provided so as to be able to advance and retreat in the optical axis direction.
It is urged to protrude. This position regulating pin 2
Means that the taking lens 50 rotates around the optical axis
When properly mounted on the body, the lens mount 51
And engages in the engagement groove 52 provided in the
Thus, the photographing lens 50 is configured to be locked.   Provided protruding from the connection reference surface 1a of the camera side mount 1.
The head 3A of the coupling shaft 3 is mounted on the lens side.
The other cup inserted into hole 51a provided in 51
It is engaged with the head 53A of the ring shaft 53 so that it can be engaged and disengaged.
And one of the coupling shafts 3 is driven by a drive mode described later.
When driven by the motor 32, the driving force is
Is transmitted to the coupling shaft 53 and is not shown on the photographing lens side.
The distance ring 54 (see Fig. 3) is rotated by the optical system moving mechanism
Then, the photographing lens optical system L is moved to a predetermined position.
To remove the attached shooting lens 50 from the camera body
The operation button 4 is linked with the position regulating pin 2 and
When pushed in the axial direction, the head of the position regulating pin 2
Pull in from the coupling reference surface 1a of the lens mount 1 and move to the lens side
The engagement of the mount 51 with the engagement groove 52 is released, and the photographing lens is released.
50 can be separated from the camera body.   On the other hand, inside the lens mount 1 on the body side, FIG.
The lens information transmission lever 5 is provided as shown in FIG.
The lever moves to the lens side when the shooting lens 50 is
Engage with the protruding step 55 provided on the rear end face to move in the optical axis direction.
The lens is pushed in, and the lens information (eg,
For example, the focal length of the lens, the open F value, etc.)
It is configured to be received on the body side. This lens information
An electric circuit, which will be described in detail later,
Conventional without a lens-side information output member such as a road device
Even with commercially available photographic lenses, the above
Information is obtained. Reference numeral 6 is provided in the photographing lens 50.
To communicate various kinds of information with electrical circuit devices such as ROM and CPU
Lens provided at the rear of the lens
Connected to side contact pin 56. Also, in FIG.
Indicates a mode switching knob which will be described later.
Shooting by rotating according to the code M, C, S
To enable the user to select the desired mode
Have been.   Next, the above configuration will be described in further detail with reference to FIG.
FIG. 1 shows an AF interchangeable lens 50 with respect to the camera body.
Indicates a state in which is mounted.   When the mode switching knob 7 is rotated, the mode switching
The arm 8 is interlocked so as to slide left and right in FIG.
Have been. Also, the shaft 10 is screwed into the operation button 4 and provided.
The connecting plate 9 is clamped and fixed between the collar of the shaft 10 and the operation button 4.
Have been. The outer periphery of the operation button 4 and the shaft 10 are
It is supported by the front wall fixing portion 11 of the body and is supported in the optical axis direction (upward in FIG. 1).
Downward), and is formed by the compression coil spring 12.
Thus, the operation button 4 projects from the camera body fixing portion 11
As always. One end of the connecting plate 9
A regulating pin 2 for mounting the head is slidably mounted.
The regulating pin 2 is moved by the compression coil spring 13 to the body side lens.
Biased to protrude from the connection reference surface 1a of the
The amount of protrusion is determined by the retaining ring 14 fixed to the regulating pin 2.
By contacting the back of the lens mount 1 on the body side
Limited. Retaining ring 15 is also attached to the other end of regulating pin 2
Operation button 4 is pressed to release the mounting of the taking lens 50.
When this is done, the connecting plate 9 is displaced downward in FIG.
The restricting pin 2 is brought into contact with the retaining ring 15 and the lens
It is configured to be retracted from the joint reference plane 1a of the und 1.
ing.   It has an end face 16a that contacts the other end of the regulating pin 2.
The intermediate lever 16 is rotatably supported by a fixed shaft 17, and
The bent end 16b is provided on the lens information transmission lever 5.
Hook 5a. This lens information transmission lever
5 is moved in the optical axis direction by a fixing pin 18 (up and down in FIG. 1).
Direction), and is always displaced by the spring 19 on the lens side.
(Upward in FIG. 1). Shooting lens 50
In Fig. 1 with the lens attached, the rear end of the lens is projected.
The step 55 moves the lens information transmission lever 5 to its extension coil spring.
It is displaced by pushing it down in Fig.
Let The amount of protrusion of the protruding step 55 depends on the focal length of the lens and
A value determined for each taking lens by the open F value
And the lens information transmission lever 5 is displaced in accordance with the value.
Is provided on the lens information transmission lever 5.
The brush 20 slides on the electrode pattern 21 and a predetermined electric signal
Signal is generated. Note that brush 20 and
First switch SW with pole pattern 21₁Is configured.   On the other hand, it can be rotated coaxially with the intermediate lever 16 by the fixed shaft 17
The first lever 22 supported by the arm has two arms 22A and 22B.
The bent part 22a of one arm 22A is an intermediate lever.
16 is an abutting surface with the end surface 16a, and the end 22b
Is the switch SW_TwoIs configured to operate. Previous
The end 22b of the arm 22A is in the second position in the state shown in FIG.
Switch_TwoIs held in the ON state, and the first lever 22 is turned counterclockwise.
Rotate in the direction to switch SW_TwoIt works to turn off.
The projecting portion 22c of the other arm 22B is
It is formed so as to be able to engage with the cam surface 8a. Switching modes
The cam 8 is provided with a protruding end 8b, and a mode switching knob
Only when the projection 7a of the No. 7 is set to the mode signal S, the
Displace to the left in Fig. 1 and switch 3_ThreeI will turn on
It is configured as follows. Further, at the end 22d of the arm 22B,
Is provided with an adjusting screw 23,
And is engaged with the second lever 25.   The second lever 25 is rotatably supported on a fixed shaft 26 and has a spring
It is urged by 27 to rotate counterclockwise in FIG.
One end 25a is in contact with the adjusting screw 23. Also,
A collar 28 is fitted and inserted into the other end 25b of the second lever 25.
Provided on the body side lens mount 1 by the collar 28
One end of the coupling shaft 3 is rotatably supported, and
Of coupling shaft 3 against collar 28 by retaining ring 29
Has been locked. The collar 28 is the second lever 25
Inserted into the notch groove formed in the other end 25b of the
The rotation of the second lever 25 causes the coupling shaft 3 to emit light.
It is configured to advance and retreat in the axial direction (vertical direction in FIG. 1).
Have been. In this case, the mounting reference of the coupling shaft 3
The movement in the direction protruding from the surface 1a is performed by the urging force of the spring 27.
It is done. Inside the coupling shaft 3 that fits with the gear 30
The flat part that acts as a key is long in the axial direction
As a result, the coupling shaft 3 is aligned with the gear 30.
Rotates to body and can move axially relative to gear 30
Is configured. The gear 30 is transmitted via a reduction gear train 31.
Rotating by the drive motor 32 for moving the taking lens optical system
Driven. Note that the body side lens mount 1 and the lens
Side mount 51 so that they are in close contact with each other at the coupling reference plane 1a.
Urged by a leaf spring 33.   Next, the condition shown in Fig. 1 with the AF interchangeable lens
In the state, the setting positions M, C, S of the mode switching knob 7 are set.
Switch SW when switching_TwoAnd SW_ThreeIndicates the operating status of
It is as shown in Table 1.   Here, the symbol M indicates "manifold" for performing focus adjustment manually.
Dual Focus Aid ”and the symbol C
Automatically focuses continuously while the release button is pressed halfway
The continuous servo mode
The symbol S indicates that once the release button is half-pressed,
If the focus is automatically adjusted, the focus will shift
Also put the lens in the stop state.
".   FIG. 4 is a block diagram for explaining the operation of the above embodiment.
FIG. In FIG. 4, the optical system L of the photographing lens 50 is shown.
Some of the light rays that have passed through the
The subject image is reflected on the moving mirror 34 and
Form an image. The image on the reticle 35 is
And through an eyepiece 37. Also, the optical system L
The other part of the transmitted light beam is
Is provided at the bottom of the camera by the secondary mirror 38
Led to the focus detection device 39 for detecting the focus state
An object image is formed on the light receiving surface of the focus detection device 39. this
The focus detection device 39 detects that the formed subject image is
Either side of front or back with respect to the predetermined focal plane
A known detection device that detects how much deviation
The arithmetic circuit 40 receiving the output is required to set the focus
From the output signal of the focus detection device 39.
And outputs the data to the control circuit 41. This data
Based on the control circuit 41, the focus state of the front pin or the back pin
Output signal corresponding to the
Show it. The display device 43 is composed of light emitting elements such as LEDs.
And the display is passed through the viewfinder eyepiece 37.
It is placed in the viewfinder field that can be visually recognized by the photographer.   The control circuit 41 includes a second switch SW_TwoAnd the third switch SW_Three
Are connected, and information provided on the lens side is
The output of the signal output circuit 44 is the lens side contact pin 56 and the camera body
Input via the side electrical contact 6. Such input information
Based on the information, the control circuit 41 sends the motor drive circuit 42
When the drive signal is output, the motor 32 rotates, and the rotation is
Decelerated through gear 30, coupling shaft on body side
3 is transmitted. Also, the rotational force of the coupling shaft 3
Is a shooting lens 50 via a coupling shaft 53 on the lens side.
The optical system L is transmitted to the optical system moving mechanism in the
Focus adjustment by moving back and forth on the moving optical axis according to the signal of
Done.   FIG. 5 is a flowchart showing the basic operation of the control circuit 41.
It is a chart. In FIG. 4, the camera's relays button is
When the electric circuit is closed by half-pressing, the control circuit
The path 41 changes from the reset state to the arithmetic circuit 40 and the focus detection device.
Issue command to device 39 to detect focus condition (step 101)
I do. When a detection signal is output from the focus detection device 39, the
An operation instruction in the focus state is issued to the arithmetic circuit 40, and the
Is calculated (step 102), and the calculation result is controlled.
Input to the circuit 41. The focus data thus input
Is output to the display device 43 and the focus state at that time is
(Front focus, focus, rear focus, etc.) is displayed (step
103).   Further, the control circuit 41 receives a signal from the lens information output circuit 44.
The data is determined (step 104), and the data is
If it indicates a predetermined AF lens, the next stage
Go to step 105 for other data or
If the lens does not have the lens information output circuit 44,
Is returned to step 101. Return to step 101
In this case, the drive motor 32 is not driven and the focus state is displayed.
So-called focus aid mode where
Become.   If the determination in step 104 is affirmative (YES),
The data indicating the AF lens is output from the lens information output circuit 44.
Received from the second switch SW_TwoIs ON
It is determined whether or not this is the case (step 105). This second switch
H SW_TwoIs a machine for selecting whether to drive the drive motor 32 or not.
If it has the function and is ON (in the case of YES),
To step 106, and if it is OFF (NO),
Return to the first step 101, focus aid mode
Becomes   In the case of YES in step 105, that is, the second switch
H SW_TwoIs ON, the data from the arithmetic circuit 40 is
To determine whether the current focus state is in focus (step
If the camera is in focus, proceed in the direction of
Proceed to step 108, and move to NO if out of focus.
Drive the motor by the amount necessary to advance and focus (step
107), and the process returns to the first step 101. on the other hand,
If the answer is YES in step 106, the third switch
H SW_ThreeIs determined to be ON (step 108). This third
Switch SW_ThreeAutomatically focuses the lens on the subject
If the camera focuses once, even if the
S mode (singing)
Servo mode) so that the camera is always in focus.
Mode (continuous surveillance)
Mode). 3rd switch
SW_ThreeIs OFF, that is, if the determination in step 108 is NO
Return to the first step 101, in which case
Time step 101 to step 107 or step in FIG.
It will process the loop up to 108, and it will be in C mode.
You. Also, the third switch SW_ThreeIs ON, i.e.
If the determination in step 108 is YES, the process proceeds to step 109.
You. In this case, reset the external S mode in the S mode.
Signal (mode switching knob 7 is set to mode symbol S)
Set and release the half-press of the relays button, for example, once
Signal only half-pressed again)
Return to step 101, otherwise only step 109
To stop the operation of the motor drive.   The above is the description of the operation of the control circuit 41 in FIG.
Therefore, the second switch SW in step 105_TwoIs the first lever
ON and OFF by the 2222, the third
Switch_ThreeIs O by the protruding end 8b of the mode switching cam 8.
N, OFF.   Fig. 1 shows the structure of the camera mount.
Configuration expanded and shown on one plane for easy explanation
FIG. 6 is a diagram showing a configuration actually shown in the perspective view of FIG.
Have been. That is, the lens information transmission lever 5 is fixed.
It is supported to rotate around the fixed axis 18 and biases it
The spring 19 is formed as a torsion coil spring. Ma
A mode switching cam linked to the mode switching knob 7
Reference numeral 8 denotes a circle which rotates integrally and coaxially with the mode switching knob 7.
The mode switching cam 8 is formed on a cylindrical cam.
A first lever 22 to be engaged and a small screw 23 for adjustment
And the second lever 25 to be engaged with so that its rotation surface is orthogonal to the second lever 25.
Is configured. The drive motor 32 and the reduction gear train 31
Is provided with a screw gear 31A to change the rotation axis by 90 °.
Has been added. As can be seen from the perspective view shown in FIG.
In addition, the constituent members include members that the photographer operates from outside.
Place it on the front of the film cartridge in the camera body
(Refer to Fig. 2)
Use the space on the side and bottom of the film cartridge
The coupling shaft and rotary drive on the winding shaft side
The structure is arranged. Therefore, the operation is reasonable,
Engage the coupling correctly and simultaneously with position regulation.
Non-AF shooting that is commercially available
The position of the shadow lens can also be correctly and reliably regulated.   FIG. 1 shows an AF taking lens 50 mounted on the camera body.
This shows a state of being worn. In this state, the operation button 4 and the position
The position regulating pin 2 is the urging force of the compression coil springs 12 and 13.
, Each project to the limit position,
The head of the pin 2 is inserted into the engagement groove 52 of the lens-side mount 51
The shooting lens 50 is locked with respect to the camera body.
I have. In addition, the transmission lever 5 is provided with
55, and the head 3A of the coupling shaft 3 is
It is engaged with the head 53A of the coupling shaft 53. Meanwhile, the first
The bent portion 22a of the lever 22 extends through the end surface 16a of the intermediate lever 16.
In a state in which it is in contact with the lower end of the position regulating pin 2
Of the adjusting small screw 23 screwed to the other end 22d of the first lever 22
A slight gap between the tip and one end 25a of the second lever 25
(0.2mm to 0.3mm) so that the adjustment screw 23
Is adjusted and fixed with an adhesive or the like. Also, as shown in FIG.
Mode, the mode change knob 7 is set to the mode symbol C.
The mode switching cam 8 continuously focuses continuously.
C mode where point adjustment is performed (continuous servo
Mode) is selected. Here, the third switch SW
_ThreeIs in the OFF state, the control circuit 41 (see FIG. 4)
And returns to step 101 from step 108 in FIG.
Bot is performed.   The photographing lens 50 in the state shown in FIG.
To remove it from the main unit, the operation button 4 is shown in FIG.
The compression coil spring 12 is pushed in against the urging force. this
In conjunction with the pressing operation of the operation button 4, the connecting plate 9
It moves downward, and the retaining ring 15 fixed to the position regulating pin 2
The head of the position control pin 2 comes into contact with the lens mount on the body side.
G can be pulled in from the coupling reference plane 1a of the g1. This allows
The relationship between the position regulating pin 2 and the engagement groove 52 of the lens-side mount 51
Is canceled. In addition, the downward movement of the position regulating pin 2
The intermediate lever 16 rotates counterclockwise around the fixed shaft 17
And the bent end portion 16b of the lens information transmission lever 5
The hook 5a is pulled down in FIG.
Between the information transmission lever 5 and the projection 55 at the rear end on the lens side.
Has a gap δ. This gap δ is
At this time, the end face of the lens information transmission lever 5 is
Provided to prevent deformation due to wear, etc.
It is.   On the other hand, according to the rotation of the intermediate lever 16 in the counterclockwise direction,
One lever 22 rotates counterclockwise about fixed shaft 17
And its end 22b is connected to the second switch SW._TwoTurn OFF. this
Accordingly, the driving of the driving motor 32 is prohibited. The other end 22
d, the second lever 25 is connected to the spring 27 through the adjusting screw 23.
Clockwise around the fixed shaft 26 against the urging force of
And attach the head 3A of the coupling shaft 3 to the lens mount on the body side.
G is retracted from the coupling reference plane 1a. This allows that head
The engagement between the section 3A and the head 53A of the lens side coupling shaft 53 is
It is released. At the same time, it engages with the position regulating pin 2.
Since the engagement with the groove 52 is released, the detachment of the photographing lens 50 is performed.
It becomes possible.   FIG. 1 shows a state in which the photographing lens 50 is correctly mounted.
However, when mounting the lens,
Position restricting pin protruding from the coupling reference surface 51b of the und 51.
Push down the coupling 2 and the coupling shaft 3 to make the bayonet type
Rotate so that the mounts 1 and 51 of the
The control pin 2 and the engagement groove 52 are engaged. At this time,
The engagement between the control pin 2 and the engagement groove 52, that is, the mounting of the photographing lens
Is incomplete, the position regulating pin 2 protrudes into the engagement groove 52.
Without contacting the connection reference surface 51b of the lens mount 51.
It is left as it is. Therefore, the position regulating pin 2 is
Place it in a state where it is displaced downward as in the state shown in FIG.
I will Therefore, the intermediate lever 16, the first lever 22 and
The second lever 25 is also left at the position shown in FIG.
Shafts 3 and 53 do not engage, and the second switch SW_TwoIs OFF
The drive motor 32 is prohibited from driving because
You.   FIG. 8 shows a state in which the AF taking lens 50 is correctly mounted.
And the mode switching knob 7 has the symbol M (monument for
(Cas. Aid). Mode off
When the change knob 7 is set to the manual symbol M,
8 is displaced rightward in FIG.
The protruding portion 22c of 22 is pushed upward by the cam surface 8a,
The first lever 22 is rotated counterclockwise. In this case, medium
The intermediate lever 16 holds the lens information urged upward by a spring 19.
It is restrained by the information transmission lever 5 and follows the first lever 22.
Does not work, but the second switch SW_TwoIs the counter clock of the first lever 22
It is turned off by turning in the direction. So switch SW_Two, SW_Three
Are both OFF and the drive motor 32 half-presses the relays button
Even if it does, it becomes impossible to drive. Also, the counterclockwise direction of the first lever 22
The second lever 25 rotates clockwise due to the
The engagement between the pulling shafts 3 and 53 is released. However, this
In the case of, the intermediate lever 16 and the lens information transmission lever 5 are affected
Projection 55 provided at the rear end on the lens side.
From the first switch SW₁Conveyed to.   When the mode switching lever 7 is set to the S mode,
The mode switching cam 8 is such that the cam surface 8a has a protrusion of the first lever 22.
Move to the left to the end position that does not engage with 22a. Follow
The first lever 22 rotates clockwise in FIG.
Return to the same position as shown. As a result, the second switch SW_Two
Becomes ON, and the coupling shafts 3 and 53 engage with each other.
You. However, at this time, the third switch SW_ThreeIs the mode switch
The control circuit 41 is turned on by the protruding end 8b of the
Selects S mode (single servo mode)
Thus, it is possible to shift to step 109 in FIG.   When switching from symbol M to symbol C in FIG.
Even if the head 3A of the pulling shaft comes into contact with 53A,
It may not happen, but it will bite as soon as the motor 32 is driven.
The driving force is transmitted to the lens side.   FIG. 9 shows the camera body of the embodiment shown in FIG.
Non-autofocusing shooting lens without pulling 53
It is an explanatory view when 60 is mounted. The position regulating pin 2
By engaging with the engagement groove 62 of the lens side mount 61, the AF
Lock the shooting lens 60 in the correct mounting position
Click. On the other hand, the head 3A of the coupling shaft 3 on the body side is
Contacting the coupling reference surface 61a of the lens side mount 61, the ninth
The upward displacement in the figure is limited at that position. So
For this reason, the second lever 25 is more widened than the position shown in FIG.
At a position turned clockwise against the urging force of the spring 27
It is. In this case, the adjusting screw 23 and one end of the second lever 25
Only the gap with 25a is widened, and the first lever fully
2nd switch SW_TwoIs left in the ON state
You.   However, a contact pin 66 as shown in FIG.
If provided, the electrical contacts 6 (FIG. 2 and FIG.
For non-AF with lens opening F value etc.
A signal indicating that it is a lens is input, or
If there is no such contact pin 66,
Control circuit 41 determines that no signal is input.
You. By this determination, the motor of step 107 is
No driving is performed, and steps 101 to 104 in FIG.
The loop is repeated, and only the focus state is displayed.
Therefore, unnecessary battery consumption like a conventionally known camera is avoided.
Be killed. In addition, to operate the distance ring of the non-AF shooting lens 60
More accurate focusing while looking at the display
You. Further, a mode switching knob 7 and a mode switching
No matter where the cam 8 is, the lens can be mounted.
Since the display operation of the in-focus state is performed automatically,
Focus adjustment is performed correctly and easily, and quick
Exchange is possible. (The invention's effect)   According to the present invention, the following effects can be obtained.   (1) The first automatic focusing mode is controlled by a single switching means.
Mode, second focus mode and manual focus mode
Can be switched between the three modes
Improvement and reduction in the number of parts can be achieved.   (2) The coupling connection / release means is a lock release hand.
Driven to the release position in conjunction with the unlocking operation by the step
And can be driven independently by the operation of the switching means.
To remove the coupling connection when removing the interchangeable lens.
Removal and manual focus adjustment mode setting
Use common coupling connection / disconnection means
The number of parts can be further reduced and cost can be reduced.
To down can be achieved.   (3) The first switch means is coupling coupling / disconnection.
Automatic focus adjustment in conjunction with the movement of the removal means to the disconnection position
Output switching signal from mode to manual focus adjustment mode
So, the mode changeover switch and the removal operation of the interchangeable lens
And a switch that detects whether or not
Can be shared.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a perspective view of the camera body side in the embodiment of FIG. 1, and FIG.
FIG. 4 is a perspective view of the photographing lens side in the embodiment shown in FIG. 4, FIG. 4 is a block diagram for explaining the operation of the embodiment shown in FIG.
FIG. 5 is a flowchart for explaining the operation of the control circuit shown in FIG. 4, FIG. 6 is a perspective view showing a specific configuration of the embodiment of the camera body side shown in FIG. 1, FIG. 7 and FIG. The figure is an explanatory diagram for explaining the operation of the embodiment of FIG.
FIG. 7 shows a state in which the operation button is pressed down to release the engagement of the position regulating pin with the lens-side engagement groove, and FIG. 8 shows a state in which the mode switching knob is switched to manual focus aid M. FIG. 9 is an operation explanatory diagram when a non-AF interchangeable lens is mounted in place of the AF interchangeable lens in FIG. 1: Lens mount on camera side 2: Position regulating pin (locking means) 3: Coupling shaft (power transmission means) 6: Electric contact (information input means) 7: Mode switching knob (mode switching means) 8: Mode switching cam (mode switching means) 31: speed reduction gear train (power transmission means) 32: drive motor, 41: control circuit 50 and 60: the interchangeable lens, SW _2: second switch SW _3: third switch

Claims (1)

(57) [Claims] A first automatic focus adjustment mode in which a lens is replaceable and a motor for driving the mounted interchangeable lens is provided, and focusing driving of the interchangeable lens by the motor is continuously performed regardless of whether or not focusing is performed; An autofocus camera that selectively sets a second autofocus mode in which the motor drives the interchangeable lens for focusing and stops when focused, and a manual focus mode in which the interchangeable lens is manually driven for focusing. A lock unit for locking the interchangeable lens at a predetermined position of a lens mount on the camera side; an unlocking unit for releasing locking by the lock unit; and a mechanism for transmitting power of the motor to the interchangeable lens. Coupling means connected to the interchangeable lens side; and A coupling which is movable between a connection position for connecting the interchangeable lens side and a connection release position for releasing the connection, and is driven to the connection release position in conjunction with the unlocking operation by the lock release means. Connecting / disconnecting means; and outputting a switching signal from the automatic focus adjustment mode to the manual focus adjustment mode in conjunction with the movement of the coupling connection / disconnection means to the disconnection position, for coupling / disconnecting the coupling. First switch means for outputting a switching signal from the manual focus adjustment mode to the automatic focus adjustment mode in conjunction with the movement of the means to the connection position; and the first automatic focus adjustment mode and the second automatic focus adjustment mode. A second switch for outputting a signal for switching between an automatic focusing mode and a first operation for switching between the automatic focusing mode and the manual focusing mode; A second operation for switching between an automatic focus adjustment mode and a second automatic focus adjustment mode is enabled, and the coupling connection / release is performed without operating the lock release unit in conjunction with the first operation. Driving the means between the connection position and the disconnection position, and interlocking with the second operation;
Switching means for switching the second switch means without operating the lock release means and the coupling connection / release means.