JPH0241722B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic focusing camera, and more particularly to an automatic focusing camera that combines a camera body equipped with a focus detection device and an interchangeable photographic lens structure equipped with a focus detection device.

The following two methods are currently known for incorporating an automatic focusing device into a camera with an interchangeable photographic lens, such as a single-lens reflex camera.

The first method is a camera body (hereinafter referred to as FD camera) equipped with a focus detection device, and a photographic lens assembly (hereinafter referred to as FD camera) equipped with a lens driving means that drives the photographic lens according to the detection output of this focus detection device. (referred to as a non-FD lens structure).
The second method is a camera body that does not include a focus detection device (hereinafter referred to as a non-FD camera body), and a photographic lens assembly (hereinafter referred to as an FD lens structure) that includes a focus detection device and a lens driving means that responds to the detection output. (referred to as a structure). In this way, conventional automatic focusing cameras with interchangeable shooting lenses combine an FD camera body with a non-FD lens structure or a non-FD camera body.
Although the FD camera body and the FD lens structure are combined, from the point of view of compatibility between the camera body and the lens structure, it is desirable that an autofocus camera can also be configured by combining the FD camera body and the FD lens structure.

Therefore, the present invention combines an FD camera body and an FD lens structure, and at that time, various devices on the camera body side and various devices on the lens structure side are organically connected, and these devices are used effectively. The purpose is to provide an autofocus camera.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a single-lens reflex camera is comprised of a camera body 100 and an exchangeable photographic lens assembly 200 attached to the camera body 100. The lens assembly 200 includes an automatic focusing device that automatically focuses the photographic lens system 201. This automatic focusing device includes a lens system 202, a lens-side focus detection device 203 having a light receiving unit that measures the transmitted light of the lens system, and a lens drive including a motor etc. that drives the photographing lens system 201 according to the focus detection signal. It is composed of a device 204 and a battery 205. Further, this lens structure 200 is provided with a lens side terminal means 206 consisting of a plurality of terminals. On the other hand, camera body 1
00 is provided with a camera body side focus detection device 101. This focus detection device 101 generates a focus detection signal by receiving object light that has passed through a photographic lens system 201, passed through a transmission portion of a quick return mirror 102, and been reflected by an auxiliary mirror 103. In the illustrated example, the focus detection device 101 is disposed at the bottom of the camera body, but it may be disposed within the finder optical system 104 made of a pentaprism or the like to receive the reflected light from the quick return mirror 102. According to the focus detection signal, the camera body 100 is in an in-focus state in which the photographic lens is focused on the main subject to be focused on, and in an in-focus state in which a subject in front of the main subject (closer to the camera) is in focus. A display device 105 is provided for displaying a focus state and a back focus state in which a subject behind the main subject is in focus. Furthermore,
A battery 106 is arranged at the bottom of the camera body. Further, the camera body side terminal means 107, which is composed of a plurality of terminals provided on the camera body 100, is coupled to the lens side terminal means 206, and transmits and receives electrical signals between the camera body and the lens assembly. The lens-side focus detection device 203 may be of any type as long as it can generate a front focus signal, a rear focus signal, and a focus signal representing the front focus, rear focus, and in-focus state, respectively, as focus detection signals. For example, in the type that obtains a focus detection signal from the sharpness of the object image formed by the lens system 202, the object distance is measured and the focus detection signal is obtained from the distance measurement output and the position of the photographing lens on the optical axis. It may be of the type that obtains a focus detection signal from the amount of deviation between the subject image and the film surface. Furthermore, light or ultrasonic waves may be used to measure the distance to the object. The camera body side focus detection device 101 is not limited to the TTL type focus detection device shown in the illustrated example that measures the light transmitted through the photographing lens, and the lens side focus detection device 203
Any device may be used as long as it can generate front focus, rear focus, and focusing signals in exactly the same way.

Next, we will discuss the effect.

This autofocus camera uses a focus detection signal from either the camera body side focus detection device 101 or the lens side focus detection device 203 when performing an autofocus operation. When the focus detection signal of the lens-side focus detection device 203 is selected by operating a selection member (not shown) (hereinafter, this case will be referred to as a lens-side signal selection mode), this selected focus detection signal operates the lens drive device 204. The photographing lens system 201 is moved toward the in-focus position, and both terminal means 2 are
06 and 107, the display device 105 of the camera body 100 is driven to display the front focus, rear focus, or in-focus state. On the other hand, when the focus detection signal of the camera body side focus detection device 101 is selected (hereinafter, this case will be referred to as camera body side signal selection mode).
In this case, this selected focus detection signal operates the display device 105 and also operates the lens driving device 204 via both terminal means 206 and 107. In this way, in the lens side signal selection mode, the focus detection signal on the lens side drives the lens drive device 204 and the display device 105, and in the camera body side signal selection mode, the focus detection signal on the camera body side drives the lens drive device 204 and the display device 105. The driving device 204 and the display device 105 are driven.

Next, a specific circuit example of the above embodiment will be explained.

In FIG. 2 showing the circuit on the photographing lens structure side, the lens side terminal means 206 is connected to the terminals T201 to T201.
205, the power supply terminal T201 is connected to the positive pole of the lens side power supply 205 via the power switch S201, and the focus detection signal terminals T202 and T20
3 is mainly used for transmitting and receiving focus detection signals, when the front focus signal is the terminal T202 is at L (low) level potential, when the rear focus signal is the terminal T203 is at the L level potential, and when the focus signal is the both terminals T202 and T203 are at the L (low) level potential. At the same time, the potential is set to L level. The terminal T204 mainly transmits a mode selection signal that determines which of the lens side signal selection mode and camera body side signal selection mode is selected. Terminal T205 is a ground terminal. between terminal T202 and ground, and between terminal T2
Constant current sources CC201 and CC are connected between 03 and ground, respectively.
202 is connected. When the power switch S201 is closed, the lens side power supply 205 supplies power to various circuits on the lens side and various circuits on the camera body side via the power supply terminal T201. Lens side focus detection device 20
3 outputs an H (high) level signal as a front pin signal to the output terminal p1 when the front pin is detected, and outputs an H (high) level signal as the rear pin signal to the output terminal q1 when the rear pin is detected.
A level signal is output, and when focus is detected, an H level signal is output as a focus signal to the output terminal r1, and when focus cannot be detected, an H level signal is output to the output terminal s1 as a detection impossible signal. Further, this lens-side focus detection device 203 immediately operates at the output terminals p1 to 1 when an L level signal is input to the input terminal t1.
Latch the output level of s1. Of course, each of the output terminals p1 to s1 is at the L level at times other than the time of detection. AND circuit AND201~AND
203 each has three input terminals, each of whose first input terminal is connected to a front pin signal output terminal p1, a rear pin signal output terminal q1, and a focus signal output terminal r1, and each second input terminal are both inverters
to the undetectable signal output terminal s1 via INV201,
And each third input terminal is an inverter INV20
Contact a of mode selection switch S202 via 2
Connected to 1. This mode selection switch S
202 is a mode selection switch S2 as shown by the dotted line.
Linked with 03. Both switches S202 and S2
03 indicates contacts a1 and a2 when a mode selection member (not shown) selects the lens side signal selection mode, and contacts b1 and b when the camera body side signal selection mode is selected.
2, respectively. Mode selection switch S20
When 2 selects contact a1, inverter INV2
02 becomes H level output, AND circuit AND2
When the gates of 01 to AND203 are opened and the contact b1 is selected, the inverter INV202 outputs an L level and closes the gate of the AND circuit. In this way, the AND circuits AND201 to AND203 output terminals p1 and q in the lens side signal selection mode.
Passes the front focus, rear focus, and focus signals of 1 and r1, and prevents them from passing through when in the camera body side signal selection mode. AND circuit AND20 for front pin signal
The output terminal of 1 is connected to the lens driving device 2 via an OR circuit OR201 and a NAND circuit NAND201.
Similarly, the output terminal of the AND circuit AND202 for the rear pin signal is connected to the front pin input terminal p2 of
02 to the rear pin input terminal q2 of the lens drive device 204, and an AND circuit for focusing signals.
The output terminal of AND203 is connected to the input terminal 208a of one-shot multivibrator 208 via OR circuit OR203. When this multivibrator 208 receives an H level input signal, it generates an H level output for a certain period of time at the output terminal 208b, and this output is inputted to the focusing input terminal r2 of the lens driving device 204 via the inverter INV203. This lens drive device 204 further has a power supply terminal W2, and when an L level signal is inputted to the input terminal p2 or q2 as a front pin drive signal or a rear pin drive signal, the built-in motor is rotated forward or reverse to rotate the photographing lens. The motor is driven in one direction or the opposite direction, and when an L level signal is input as a motor stop signal to the focus input terminal r2, the motor is suddenly stopped. Such a lens driving device is disclosed in, for example, Utility Model Application No. 100581/1983 (Kokai No. 56/20395).

Also, the above-mentioned AND circuit AND20 for the front pin signal
1 controls the transistor Q201 via the OR circuit OR204, the output of the rear pin signal AND circuit AND202 controls the transistor Q202 via the OR circuit OR205, and the output of the focus signal AND circuit AND203 controls the transistor Q201. OR circuit OR20
4, both transistors Q20 via OR205
1. Control Q202. When the focus lock switch S204 connected between the input terminal t1 of the focus detection device 203 and the ground is closed in response to an external operation, it inputs an L level signal to the input terminal t1, and outputs the output terminals p1, q1, r1, At the same time each output of s1 is latched, the inverter INV204 is inverted to an H level output, the one-shot multivibrator 208 is operated via the OR circuit OR203, and a motor stop signal is input to the lens drive device 204. Forcibly stopping the lens driving device 204 by an external operation in this manner regardless of the output state of the focus detection device will hereinafter be referred to as a focus lock operation.

A reference voltage source 209 is connected to the contact a2 of the mode selection switch S203, and in the lens side signal selection mode, it is connected to the terminal T20 through the switch S203.
A mode selection signal is applied to 4. The infinity switch S205 shown at the bottom center of the figure is closed when the taking lens is at the infinity position (the taking lens position when the taking lens is focused on an object at infinity), and the close-up switch S206 is closed when the taking lens is at the infinity position (the taking lens position when the taking lens is focused on an object at infinity). is closed when the lens is at a close position (the position of the photographing lens when the photographic lens is in focus on the closest subject).
Infinity switch S205 is a NAND circuit NAND2
01 and inverter 205, an H level signal is applied when they are open, and an L level signal is applied when they are closed. Therefore, closing the switch S205 forces the NAND circuit NAND201 to output an H level,
At the same time, the inverter INV205 prevents the front pin drive signal from being input to the front pin input terminal p2.
Transistor Q203 is turned on via . The proximity switch S206 applies an H level signal to the NAND circuit NAND202 and the transistor Q204 when it is open, and applies an L level signal when it is closed. Therefore, when the photographic lens is in a close position, the NAND circuit
NAND202 is forced to output H level,
The rear pin drive signal is prevented from being input to the rear pin input terminal q2, and the transistor Q204 is turned on. OR circuit shown in the center left of the diagram
Reference numeral 206 transmits a focus signal from the camera body side focus detection device sent via terminals T202 and T203 to an OR circuit OR203 via an inverter INV206. The first input terminal is the mode selection switch S202
The second input terminal is connected to contact a1 of inverter INV2.
The AND circuit AND204 connected to the terminal T202 via the terminal T202 drives the lens by using the front focus signal sent from the focus detection device on the camera body side via the terminal T202 as the front focus drive signal via the OR circuit OR201 and the NAND circuit 201. input to device 204; Similarly, the first input terminal is connected to contact a1, and the second
AND circuits 205 whose input terminals are respectively connected to terminal T203 via inverter INV208 convert the pin signals sent from the camera body via terminal T203 to OR circuit OR202 and NAND circuit NAND.
The signal is transmitted to the lens driving device 204 as a rear focus driving signal via the pin 202. The first input terminal is contact a1
Furthermore, an AND circuit AND206 whose second input terminal is connected to the focus lock switch S204 via an inverter INV204 transmits a focus lock signal in the camera body side signal selection mode to the camera body side. Resistor R201 is OR circuit
A switch S207 connected between the input terminal of T206 and ground, and between this resistor R201 and the power switch S201 is connected to the terminal means 206 (T20
1 to T205) is closed when this lens structure is attached to a camera body that does not have terminal means for connecting to T205), and is otherwise open.

Next, the circuit on the camera body side will be explained.

In FIG. 3, the camera body side terminal means 107
has terminals T101 to T105, and when the camera body side and lens side terminal means 107 and 206 are connected, the terminal T101 is connected to the terminal T201 and the terminal T102.
is T202, T103 is T203, and T104
is connected to T204, and T105 is connected to T205. The terminal T101 is connected to the positive terminal of the camera body side power supply 106 via the power switch S101. The camera body side focus detection device 101 is exactly the same as the lens side focus detection device 203 described above, and has an output terminal P for front focus, rear focus, focus, and undetectable signals.
3, q3, r3, s3 and a focus lock input terminal t3. The mode discrimination comparator CP101 shown in the lower right of the figure has an inverting input terminal connected to the terminal T104, and a non-inverting input terminal connected to the reference voltage source 1.
08 respectively, and the mode selection switch S20
2. S203 determines which mode is selected, and generates an L level output when the lens side signal selection mode is selected, and an H level output when the camera body side signal selection mode is selected. The camera body side focus detection signal display AND circuits AND101 to AND104 display the front focus signal, rear focus signal, focus signal, and focus detection failure signal from the camera body side focus detection device 101 when in the camera body side signal selection mode. , that is, when the output of the discrimination comparator CP101 is at H level,
Light emitting diodes L10 for front focus display, rear focus display, focus display, and undetectable display of the display device 105 are connected via OR circuits OR101 to OR104, respectively.
1 to L104, respectively, and in the lens side signal selection mode, the focus detection signal is cut off. In addition to the visual display elements such as the light emitting diodes L1 to L4 and liquid crystal in this example, the display elements of the display device 105 include:
An auditory display element such as a sounding body may also be used. The front focus signal of the terminal P3 and the rear focus signal of the terminal q3 of the focus detection device 101 are sent to an AND circuit AND105, respectively.
OR circuit OR105, OR1 via AND106
The focus signal at terminal r3 is input to both OR circuits OR105 and OR106 via one-shot multivibrator 110, which is exactly the same as one-shot multivibrator 208 in FIG. This OR circuit OR105 and OR10
The outputs of 6 are AND circuits AND107 and AND1, respectively.
08 respectively. This AND circuit AND1
07, AND108 is an AND circuit AND101~
Discrimination comparator CP10 similar to AND104
Controlled by the output of 1, the OR circuit OR105,
The output of OR106 is transmitted to transistors Q101 and Q102, respectively, when in the camera body side signal selection mode, and is cut off when in the lens side signal selection mode.
Therefore, these transistors Q101 and Q102 are controlled by the camera body side front focus signal, rear focus signal, and focus signal when in the camera body side signal selection mode, and when the front focus is set, only transistor Q101 is turned on and the terminal T102 is turned on. When the terminal is at L level potential, only the transistor Q102 is turned on and the terminal T103 is turned on.
When focusing, both are turned on and both terminals T102 and T103 are set to L level. When the undetectable signal is generated, the inverter INV101 connected to the undetectable signal output terminal S3 of the focus detection device 101 operates the AND circuits AND1 to AND103,
Close the gates of AND107 and AND108. A current mirror circuit composed of transistors Q103 to Q105 causes a current having the same value as the constant current of constant current source CC101 to flow through the collectors of transistors Q104 and Q105. The constant current value of this constant current source CC101 is set to be larger than that of constant current sources CC201 and CC202 in FIG.

Next, a circuit that transmits a focus detection signal sent from the lens side via terminals T102 and T103 to the display device 105 will be described. Noah circuit NOR101,
In the NOR 102, each first input terminal is connected to the terminals T102 and T103, respectively, and each second input terminal is connected to the output terminal of the discrimination comparator CP101. This NOR circuit NOR101 includes an OR circuit OR107 for an undetectable signal from the terminal T102, and an AND circuit AND10 for a focusing signal.
9. Transmit to the front pin signal AND circuit AND110. Similarly, the NOR circuit NOR102 is connected to the terminal T10.
The signal from 3 is OR circuit OR107, AND circuit
AND109, AND circuit for rear pin signal AND11
1. The output terminals of the AND circuits AND109 to AND111 for focus, front focus, and rear focus signals are OR circuits OR103, OR101, and OR102, respectively.
It is connected to focusing, front focusing, and rear focusing light emitting diodes L103, L101, and L102 via. An inverter INV102 is connected between the output terminal of the AND circuit AND109 and the input terminals of the AND circuits AND110 and AND111. The output of the undetectable signal OR circuit OR107 is sent to the focus undetectable display light emitting diode L10 via a NOR circuit NOR103 and an OR circuit OR104, which are controlled by a discrimination comparator CP101.
4.

The exposure switch S102 shown in the upper right of the figure is normally open, is closed in conjunction with the shutter release operation, and is kept closed at least while the shutter is open. This exposure switch S102
is closed, transistor Q106 is turned on, and transistor Q104 of the current mirror circuit is turned on.
and Q105 are turned off, and the L level signal is output to the AND circuits AND101 to AND104, AND10.
7 to AND111. A focus lock signal OR circuit OR circuit 108, whose output terminal is connected to the input terminal t3 of the focus detection device 101 and whose input terminals are connected to the terminals T102 and T103, respectively, transmits the focus lock signal from the lens body side to the camera body side focus detection device 101. . A constant current source CC102 is connected between the terminal T104 and the ground, a cathode of a diode D101 is connected to the connection point between this constant current source and the terminal T104, and a constant current source is connected between the anode of this diode and the power switch S101.
CCs 103 are connected to each other. This constant current source
The constant current value of CC103 is set to be larger than that of constant current source CC102. Anode of diode D101 and transistor Q107 for determining the infinite position
A diode D102 is connected between the base of the diode D102 and the base of the diode D102. The forward voltages of both diodes D101 and D102 are determined to be approximately equal. Transistor Q107 turns off when the photographing lens reaches the infinite position, outputs the inverter INV104 connected to its collector at L level, and closes the gate of AND circuit AND105. The close position determination comparator CP102 has a non-inverting input terminal connected to the reference voltage source 109, and an inverting input terminal connected to the terminal T1.
04 respectively.

This comparator CP102 outputs an L level when the photographing lens reaches a close position, and closes the gate of the AND circuit AND106.

Here, the voltages V108, V109, V209 of the reference voltage sources 108, 109, 209 and the voltage V of the camera body side power supply 106 or lens side power supply 205 are
The relationship between 106 or V205 and the base-emitter voltage VBE of transistor Q107 is determined as follows.

V209＞V108＞V205(V106)＞V109＞VBE
...Next, the action will be explained.

When the lens assembly 200 is attached to the camera body 100, the lens side terminals T201 to T205 are connected to the corresponding camera body side terminals T101 to T105, respectively. When the camera side power switch S101 is closed, the camera body side power supply 106 supplies power to various circuits on the camera body side, and at the same time, supplies power to various circuits on the lens side via power supply terminals T101 and T201. Instead of this power switch S101, a lens side power switch S201 may be closed, and in this case, the lens side power supply 205 supplies power to various circuits on the lens side and the camera body side. As mentioned above, the current value of constant current source CC101 is equal to the current value of constant current source CC201, CC
Since the constant current value is set to be larger than the constant current value of 202, when transistors Q101 and Q201 are off, terminals T202 and T102 are set, and when transistors Q102 and Q202 are off, terminals T203 and T
103 each have an H level potential.

(1) In case of lens side signal selection mode.

Mode selection switches S202 and S203 select contacts a1 and a2, respectively. The photographing lens is located between the infinity position and the close position, so both the infinity switch S205 and the close position switch S206 are open. Further, neither the shutter release nor the focus lock operation is being performed, and the exposure switch S102 and the focus lock switch S102 are not being operated.
It is assumed that 204 is also open. By connecting to contact a1 of mode selection switch S202, AND circuits AND204 and AND20 for camera side focus detection signal
5 receives an L level signal, closes its gate, and sets the inverter INV202 to an H level to the AND circuit AND2 for the lens side focus detection signal.
Open the gates from 01 to AND203. On the other hand, due to the connection between the mode selection switch S203 and the contact a2, the voltage of the reference voltage source 209 is changed to the terminals T204 and
The signal is input to the mode determination comparator CP101 on the camera body side via T104. As shown in the equation, since the voltage of the reference voltage source 209 is higher than that of the reference voltage source 108, the determination comparator CP
101 becomes the L level output, and the AND circuit AND101 to AND1 for displaying the focus detection signal on the camera body side
04 and the AND circuits AND107 and AND108 for transmitting focus detection signals on the camera body side are closed. As a result, the camera body side focus detection device 101
The output becomes irrelevant to the display device 105 and does not interfere with the potentials of the focus detection signal terminals T102 and T103. In addition, the above-mentioned judgment comparator
At the same time, the L level output of CP101 is output from NOR circuits NOR101 to NOR103 for lens side focus detection signals.
is made to respond to the lens-side focus detection signal sent from the focus signal terminals T102 and T103.

(1.1) For front pin detection.

When the lens-side focus detection device 203 detects the front focus, its front focus output terminal P1 generates an H level output, that is, a front focus signal. At this time, the other output terminals q1, r1, and s1 are at L level potential.
This front pin signal is on the other hand an AND circuit AND20
1. NAND circuit via OR circuit OR201
Input to one input terminal of NAND201. At this time, among the other input terminals of the NAND circuit NAND201, the input terminal connected to the OR circuit OR206 receives an H level signal as described later, and the infinity switch S205 and the focus lock switch S2
Both switches S are connected to the input terminals connected to 04 respectively.
205 and S204 are each input with an H level signal to open them. Therefore, by inputting the above-mentioned front pin signal, the output of the NAND circuit NAND201 becomes L.
level. The lens driving device 204 drives the photographic lens in one direction so as to approach the in-focus position, specifically, toward an infinity position, in response to this L level output, that is, the front focus driving signal. On the other hand, the front pin signal passing through the front pin signal AND circuit AND201 turns on the transistor Q201 via the OR circuit OR204 to bring the terminal T202 to the L level potential. Of course, at this time, the rear pin output terminal q1 and the focus output terminal r1 are at the L level, so the transistor Q202 is off and the terminal T203 is at the H level potential. When the front pin is detected in this manner, the terminal T202 becomes an L level potential and the terminal T203 becomes an H level potential. The L level potential of this terminal T202 is connected to the NOR circuit from the camera body side terminal T102.
It is input to NOR101. The other input terminals of this circuit are connected to a mode discrimination comparator CP10 in advance.
Since the L level output of 1 is applied, the output of the NOR circuit NOR101 is inverted to H level, and this H level output is applied to the front pin signal AND circuit AND1.
10. Display device 10 via OR circuit OR101
The front pin display light emitting diode L101 of No. 5 is turned on. On the other hand, the NOR circuit NOR102 is connected to the terminal T1
Since the H level signal of 03 is input, it becomes the L level output, which is the focusing AND circuit AND109.
and the rear pin AND circuit AND111, both are L.
Level output. For this reason, the light-emitting diodes L103 and L102 for in-focus display and rear focus display are turned off. Furthermore, an OR circuit for the focus detection failure signal
Since OR107 is an H level output, the NOR circuit
The output of NOR 103 becomes L level, and the light-emitting diode L104 for indicating undetectable state is also turned off.

In addition, even if the photographing lens is moved to the infinity position, which is one end of its movement range, in response to the front focus signal, due to causes such as malfunction of the focus detection device,
If the front pin signal continues to be output,
Since the lens driving device 204 attempts to further drive the photographing lens in the above-mentioned one direction in response to the front focus signal, there is a risk that the driving device 204 or the photographing lens or the like may be damaged. In order to prevent this situation, when the photographic lens reaches the infinity position, the infinity switch S205 is closed and the NAND circuit NAND2 is closed.
01, the output of the NAND circuit is forcibly set to H level, and the front pin drive signal disappears.

(1.2) For rear pin detection.

When the lens-side focus detection device 203 detects the rear focus, the H level signal from the rear pin output terminal q1, that is, the rear focus signal, is sent to the NAND circuit NAND20 through the AND circuit AND202 and the OR circuit OR202.
2 output is inverted to L level. In response to this L level output, that is, the rear focus drive signal, the lens drive device moves the photographing lens in the opposite direction to the front focus, that is, toward the closest position, and approaches the in-focus position. Also,
The rear pin signal turns on the transistor Q202 via the OR circuit OR205, and brings the potential of the terminal T203 to the L level. At this time, output terminals p1, r1
Since is an L level output, the terminal T202 is at an H level. The NOR circuit NOR102 outputs an H level due to the L level potential of the terminal T203, which lights up the rear pin display light emitting diode L102 via the rear pin display AND circuit AND111 and the OR circuit OR102. The other display light emitting diodes L101, L103, and L104 are off.

Note that even if the rear focus signal is still generated even after the photographic lens reaches the other end of its movement range, the close position, the close position switch S206
is closed, the output of the NAND circuit NAND202 is forcibly set to H level, and the rear pin drive signal disappears.

(1.3) For focus detection.

When the lens-side focus detection device 203 detects focus, the focus output terminal r1 generates an H level output, that is, a focus signal. This focusing signal is an AND circuit
It is input to the one-shot multivibrator 208 via AND203 and OR circuit OR203. As a result, the vibrator 208 generates an H level output for a certain period of time, and this H level output is inverted to an L level output by the inverter INV203 and inputted to the focus input terminal r2 as a motor stop signal. Then, the lens driving device 204 instantly stops its motor and stops the photographing lens at the in-focus position. In addition, one-shot multivibrator 208
The predetermined period of time is selected to be at least longer than the time required to completely stop the motor. Further, the focusing signal turns on both transistors Q201 and Q202 via both OR circuits OR204 and OR205, and sets the terminals T202 and T203 to L level potential. Each of these L level potentials is a NOR circuit NOR10.
1 and NOR102 are each output at H level, and therefore, the AND circuit for focusing AND109 outputs at H level. The H level output of this circuit AND109 lights up the focusing light emitting diode L103 via the OR circuit OR103. At this time, the output of the focusing AND circuit AND109 is inverted by the inverter INV102 and becomes an L level output, closing the gates of the front pin and rear pin AND circuits AND110 and AND111. Therefore, the front pin and rear pin display light emitting diodes L101 and L102 are turned off. Furthermore, since the undetectable OR circuit OR107 has an H level output, the undetectable display light emitting diode L104 is also turned off.

(1.4) When focus cannot be detected.

For example, if focus detection is impossible due to the nature of the subject, the lens-side focus detection device 203
generates an H level output, ie, an undetectable signal, at the terminal s1. This undetectable signal is the inverter INV2
Inverted at 01 and AND circuit AND201~AND2
03 are all L level outputs. Therefore, the lens driving device 204 has its input terminals p2, q2, r2.
An H level signal is input to all of them, and the photographing lens is not driven. Also, transistors Q201 and Q20
Since both terminals T202 and T203 are turned off and both terminals T202 and T203 have an H level potential, the undetectable OR circuit OR107 on the camera body side outputs an L level. This L level output causes the NOR circuit NOR103 to output an H level output, and via the OR circuit OR104, lights up the light emitting diode L104 for indicating that focus cannot be detected.

(1.5) For focus lock operation.

Focus lock switch S2 by external operation
04 is closed, the lens side focus detection device 20
An L level signal is input as a focus lock signal to the input terminal t1 of No. 3. This allows the device 20
The outputs of output terminals p1 to s1 of No. 3 are immediately latched. In addition, the focus lock signal mentioned above is inverted to H level by the inverter INV204 and the OR circuit
The signal is input to the one-shot multivibrator 208 via the OR 203. In response to this input, the multivibrator 208 outputs a motor stop signal for a certain period of time as described above. When the focus lock switch S204 is closed in this way, the photographing lens position is held at the position immediately before closing, and the output of the focus detection device 203 is latched, so that the display state of the display device 105 on the camera body side is is also held in the state immediately before the switch was closed.

(1.6) For shutter release operation.

In conjunction with the shutter release operation, the exposure switch S102 on the camera body side is closed at least during film exposure. This closing is performed by AND circuit AND109 for in-focus display and AND1 for front focus display.
10.Forcibly output the rear pin display AND111 to L level, and inverter INV103
The undetectable display NOR circuit NOR103 is also forced to output an L level through the NOR circuit NOR103. In this manner, the display device 105 turns off its display during film exposure. Further, closing the exposure switch S102 described above further turns on the transistor Q106 and turns off the transistors Q104 and Q105 of the current mirror circuit. For this reason, constant current sources CC201 and CC on the lens side
202, terminals T202 and T203 are both set to L level potential, and OR circuit OR206 outputs L level. This L level output is inverter
It is inverted by INV 206 and operates one-shot multivibrator 208 via OR circuit OR 203, and inputs a motor stop signal to lens drive device 204. In this way, during film exposure, the display device 1
05 disappears and the photographic lens is stopped.

(2) In case of camera body side signal selection mode When mode selection switches S203 and S204 are connected to contacts b1 and b2, respectively, camera body side signal selection mode is entered. By connecting the switch S203 and the contact b1, H level signals are input to the AND circuits AND204, AND205 for focus detection signals on the camera body side and the AND circuit AND206 for focus lock signals, respectively, thereby opening the respective gates. The above connection further forces all AND circuits AND201 to AND203 to output L level through the inverter INV202, and both transistors Q201 and Q202 are always turned off. In this way, the output of the lens-side focus detection device 203 is transmitted to the terminal T20.
2. Make sure there is no interference with the potential of T203.
Also, infinity switch S205 and close range switch S2
06 are both open, transistors Q203 and Q204 are off, so the selection switch S2
03 and contact b2, the terminal T204 becomes open. In this open state and the constant current value of the constant current source CC103 on the camera body side, the constant current source CC102
Because it is larger than that of transistor Q107
turns on. By turning on, the potential of the terminal T104, ie, the input potential to the comparators CP101 and CD102, becomes equal to the base-emitter voltage VBE of the transistor Q107. As shown in the equation, since the reference voltages V108 and V109 are set to be larger than the voltage VBE, both the mode discrimination and close position discrimination comparators CP101 and CP102 output H level. In addition, the inverter is turned on by turning on the transistor Q107 for determining the infinite position.
INV104 also becomes an H level output. The H level output of the inverter INV104 for the infinite position and the H level output of the comparator CP102 for the close position are provided by AND circuits AND105 and AND106, respectively.
Open the gate. Also, a comparator for mode determination
The H level output of CP101 is output from AND circuits AND107 and AND108 for focus detection signals on the camera body side.
, and further open the gates of the signal display AND circuits AND101 to AND104 on the camera body side. By opening the gates of the AND circuits AND107 and AND108, the focus detection signal on the camera body side can be transmitted to the lens side.
By opening the gates 101 to AND104, the camera body side focus detection signal can drive the display device 105.

(2.1) For front pin detection.

When the camera body side focus detection device 101 detects the front focus, it generates an H level output, that is, a front focus signal, at the front focus output terminal P3. This front pin signal lights up the front pin display light emitting diode L101 via the AND circuit AND101 for display and the OR circuit OR101. Also, the previous pin signal is an AND circuit
AND105, OR circuit OR105, AND circuit
Transistor Q101 is turned on via AND107, and terminal T102 is brought to L level potential. At this time, since both the rear pin output terminal q3 and the focus output terminal r3 are L level signals, the transistor Q102 is off and the terminal T103 is at an H level potential. The L level potential of this terminal T102 is inverted to an H level signal by the inverter INV207 on the lens side.
The NAND circuit NAND201 is outputted at L level via the AND circuit AND204 and the OR circuit OR201 to create a front pin drive signal. This causes the lens driving device 204 to move the photographing lens in one direction. If the photographing lens reaches the infinity position due to this movement, the infinity switch S205 closes and the front focus drive signal disappears, as in the lens side signal selection mode.

(2.2) For rear pin detection.

When the rear pin is detected, an H level output, ie, a rear pin signal, is generated at the rear pin output terminal q3. After this, the pin signal is on the other hand the display AND circuit AND10
2. Light up the rear pin display light emitting diode L102 via OR circuit OR102, and on the other hand, AND circuit AND106, OR circuit OR106, and AND circuit
Transistor Q102 is turned on via AND108, and terminal T103 is brought to L level potential. This L level potential is the inverter INV20 on the lens side.
8, it is inverted to an H level signal, and the AND circuit AND
205, NAND circuit via OR circuit OR202
The NAND202 is set to L level output and a rear pin drive signal is created. This moves the photographic lens in the opposite direction to the front focus. When the photographic lens reaches the close position due to this movement, the close position switch 206 closes and the rear focus drive signal disappears.

(2.3) For focus detection.

When focus is detected, an H level output, that is, a focus signal is generated at the focus output terminal r3. On the one hand, this focusing signal is output by an AND circuit AND103, an OR circuit OR
Focus display light emitting diode L10 via 103
3 is turned on, and on the other hand, it is input to the one-shot multivibrator 110. As a result, this multivibrator 110 generates an H level output for a certain period of time, and this H level output is output from both OR circuits OR105 and
OR106, AND circuit AND107, AND10
8, transistors Q101 and Q102 are turned on, respectively, and terminals T102 and T103 are both brought to L level potential. These two L level potentials are OR circuit
206 is an L level output, and this L level output forces the NAND circuits NAND201 and NAND202 to output an H level, and the inverter
Inverted to H level by INV206 and OR circuit OR2
One-shot multivibrator 2 via 03
Enter 08. As a result, the multivibrator 208 generates a motor stop signal for a certain period of time to abruptly stop the lens drive.

(2.4) When focus cannot be detected.

If focus detection is not possible, an H signal is sent to the output terminal S3.
A level output, that is, a focus detection failure signal is generated. This is an AND circuit AND104 on the one hand, and an OR circuit OR
104, the light emitting diode L104 for indicating that focus cannot be detected is turned on, and on the other hand, the inverter
INV101 inverts to L level and AND circuit
The outputs of AND107 and AND108 are set to L level, and transistors Q101 and Q102 are turned off. With this off, both terminals T102 and T103 become H level, and no signal is input to the lens driving device 204 on the lens side.

(2.5) For focus lock.

When the focus lock switch S204 is closed, the inverter INV204 outputs an H level. On the other hand, this H level output is OR circuit OR2
One-shot multivibrator 2 via 03
Input 08 to suddenly stop the driving of the photographic lens,
On the other hand, AND circuit AND206, OR circuit OR2
04, transistor Q20 via OR205
1, Q202 is turned on and terminals T202 and T203 are both brought to L level potential. These two L level potentials are OR circuits for focus locking on the camera body side.
When the output of 108 is set to L level, the camera body side focus detection device 101 latches its output.
Therefore, the display content on the display device 105 is maintained in the state immediately before the focus lock switch S204 was closed.

(2.6) During film exposure.

When the exposure switch S102 is closed, the display AND circuits AND101 to AND104 are forced to go low.
level output, all display disappears, and
The lens driving device 204 suddenly stops driving the photographing lens by exactly the same operation as in the lens side signal selection mode.

In this embodiment, in the camera body side signal selection mode, a signal indicating that the photographing lens has reached the infinity position or the close position, that is, the infinity switch S2
05, the structure is such that the close signal of the close switch S206 can be transmitted to the camera body. This configuration will be explained in detail below.

When the infinity switch S205 is closed, the transistor Q203 is turned on by the inverter INV205, and the terminal T204 is brought to an L level potential. Therefore, the transistor Q107 for determining the infinite position on the camera body side is turned off. If there is a display element in the camera body that warns that the photographic lens is at an infinity position, or if there is a drive device for the photographic lens, the warning display element will be activated in response to turning off the transistor Q107. drive or stop the drive of the lens drive device. In this embodiment, the transistor Q107 is turned off by the inverter INV1.
04, the AND circuit AND105 is forced to output an L level, and the transistor Q101 is turned off. With this off, the terminal T102 becomes H level potential and the front focus drive signal of the lens drive device on the lens side disappears. The other nearby switch S20
6, the transistor Q204 turns on and the voltage V1 of the camera side power supply 106 is applied to the terminal T204.
06 or the voltage V205 of the lens side power supply 205 appears. This voltage and the reference voltage V1 on the camera body side
Since the relationship with 08 and V109 is determined as shown in the formula, the mode discrimination comparator CP101
remains at the H level output, but the comparator CP102 for determining the closest position is inverted to the L level output,
Further, transistor Q107 is turned on. In this way, the close position determination comparator CP102 outputs an L level output in response to the closing of the close position switch S206, and the AND circuit AND106, the OR circuit OR106,
Transistor Q via AND circuit AND108
102 is turned off, and the rear pin drive signal of the lens drive device 204 disappears.

As can be seen from the above explanation, when a photographic lens assembly equipped with a focus detection device is attached to a camera body also equipped with a focus detection device, the two are electrically connected by the terminal means, and the lens side signal selection mode is set. In this case, the focus detection signal from the lens-side focus detection device drives the lens drive device on the lens side, and also drives the display device on the camera body side via the terminal means. In the camera body side signal selection mode, the focus detection signal from the camera body side focus detection device drives the display device and also drives the lens drive means via the terminal means. The front focus signal, rear focus signal, and focus signal in the lens side signal selection mode are signals corresponding to the front focus signal, rear focus signal, and focus signal, respectively, in the camera body side signal selection mode. The signals are transmitted to the camera body side or to the lens side through the same terminal.

Furthermore, the photographic lens structure shown in FIG. 2 and the camera body shown in FIG. 3 can fully exhibit their functions even when combined with different types of camera bodies or photographic lens structures, respectively. This is detailed below.

Next, a combination of the camera body shown in FIG. 3, which includes a focus detection device and a display device, and a photographic lens assembly, which does not include a focus detection device but includes a lens drive device, will be described.

FIG. 4 shows a circuit example of such a photographing lens structure. When this photographic lens structure is attached to the camera body, the lens side terminal T3 is shown in FIGS. 3 and 4.
01 to T305 are the corresponding terminals T on the camera body side
101 to T105, respectively. When the power switch S101 is closed, the camera body side power supply 106 supplies power to various circuits on the camera body side, and also supplies power to the lens side circuits via mutually connected terminals T101 and T301. It is assumed that the infinity switch S301, the close-up switch S302, and the focus lock switch S303 on the lens side are open. Since the terminal T304 is open by opening both switches S301 and S302, the transistor Q10 for infinity position determination on the camera body side
7 is turned on, and the comparator CP1 for determining the closest position
02 is H level output, mode discrimination comparator
CP101 becomes an H level output. The H level output of this comparator CP101 is output from AND circuits AND101 to AND104 for the camera side focus detection signal.
Open all gates of AND107 and AND108. In this way, the output of the camera body side focus detection device 101 can drive the display device 105 and can be transmitted to the lens side.

(3.1) For front pin detection.

When the camera body side focus detection device 101 detects the front focus, the front focus display light emitting diode L101 lights up and the terminals T102 and T10 light up as described above.
3 becomes an L level potential and an H level potential, respectively. As a result, terminal T302 becomes L level on the lens side.
The terminal T303 becomes H level potential. This terminal T
The H level potential of 303 turns off both transistors Q301 and Q302. This transistor Q
302 is turned off by transistors Q303 and Q304.
Turn off. On the other hand, the L level potential of terminal T302 turns on transistors Q305 and Q306. Turning on transistor Q305 turns on both transistors Q307 and Q308, and as a result, current flows through transistor Q307, motor M, and transistor Q308, causing the motor to rotate.
Move the photographic lens toward the in-focus position. if,
When the photographic lens reaches the infinity position due to this movement, the infinity switch S301 is closed. Due to this closing, the terminal T304 becomes an L level potential,
Transistor Q for infinity position determination on the camera body side
107 is turned off, and terminal 10 is turned off in exactly the same manner as described above.
2 changes to H level potential. As a result, all transistors on the lens side are turned off, and the power supply to the motor M is cut off.

(3.2) For rear pin detection.

When the rear focus is detected, the camera body side lights up the rear focus display light emitting diode L102 and sets the terminals T102 and T103 to H level potential and L level potential, respectively. Lens side terminal T3 corresponding to this
The H level potential of 02 is the transistor Q305~Q
308 is turned off, and the L level potential of the terminal T303 turns on the transistors Q301 to Q304. As a result, current flows through the transistor Q303, the motor M, and the transistor Q304, and the motor M reverses to move the photographic lens in the opposite direction toward the in-focus position. If the photographing lens reaches the close position due to this movement, the close position switch S302 is closed and the voltage of the camera body side power supply 106 appears at the terminal T304. Therefore, as is clear from the equation, the close position determination comparator CP102 outputs an L level, and the terminal T103 changes to an H level potential. Therefore, all transistors on the lens side are turned off,
Power supply to motor M is cut off.

(3.3) For focus detection.

When focus is detected, the focus display light emitting diode L103 lights up and the terminals T102 and T1
03 are both at L level potential. The L level potentials of the lens side terminals T302 and T303 corresponding to this turn on transistors Q306 and Q302, respectively. The transistor Q302 is turned on because its collector is connected to the base of the transistor Q307 and the emitter of the transistor Q305, respectively.
is turned off and current is supplied to the emitter of transistor Q305. Therefore transistor Q305
turns on, which in turn turns on transistor Q308. On the other hand, turning on transistor Q306 turns off transistor Q303 and turns on transistor Q301, since its collector is connected to the base of transistor Q303 and the emitter of transistor Q301, respectively. This transistor Q301 is turned on by the transistor Q30
Turn on 4. In this way, transistor Q30
3, Q307 turns off, transistor Q304,
Q308 is turned on and motor M has transistor Q3.
A short circuit consisting of 04 and Q308 is formed,
Motor M is suddenly stopped.

(3.4) When focus cannot be detected.

If the focus cannot be detected, the light emitting diode L104 for indicating that the focus cannot be detected lights up and the terminals T102 and T
103 both have an H level potential. The corresponding H level potential of the lens side terminals T302 and T303 turns off all the transistors Q301 to Q308, so that no power is supplied to the motor M and the photographing lens is not driven.

(3.5) During film exposure.

By closing the exposure switch S102, the display device 105 turns off the entire display, and the transistor Q1
01, Q102, Q104, and Q105 are all turned off, and terminals T102 and T103 are, therefore, terminal T
302 and T303 are in an open state. For this purpose,
All transistors on the lens side are turned off and no power is supplied to the motor M.

(3.6) For focus lock operation.

Focus lock switch S303 on the lens side
is closed, diodes D301, D302
Both terminals T302 and T303 become L level potential through the terminals T302 and T303. Therefore, the motor M suddenly stops as in all cases of focus detection. On the camera body side, terminal T
The L level potential of 302 and T303 is OR circuit
Input terminal t of focus detection device 101 via 108
3, the outputs of the terminals P3 to S3 are latched, and the display on the display device 105 is fixed.

A combination of the photographing lens assembly shown in FIG. 2, which includes a lens-side focus detection device and a lens drive device, and a camera body, which includes a display device but does not include a focus detection device, will be described.

FIG. 5 shows an example of the circuit of such a camera body.
When the above-mentioned photographic lens structure is attached to this camera body, the corresponding terminal T4 is shown in FIGS. 2 and 5.
01 and T201, T402 and T202, T403
and T203, T404 and T204, T405 and T
205 are connected to each other. Since the camera body does not have a focus detection device, the mode selection switches S202 and S203 on the lens side are connected to contacts a1 and a2.
are connected to each other. Of course, it may be configured such that the mode selection switch automatically selects the contact point upon detecting such a camera body. Close either the camera body side power switch S401 or the lens side power switch S201,
Camera body side power supply 401 or lens side power supply 205
This supplies power to the camera body side and lens side circuits. Since the terminal T404 of the camera body is not connected, no signal from the lens side terminal T204 is transmitted to the camera body. Since the exposure switch S402 is open, the front focus, rear focus, and focusing NOR circuits are connected via the inverter INV401.
L level signals are input to NOR401, NOR402, and NOR403, respectively, and an H level signal is input to AND circuit AND401 for focus detection failure. Transistors Q401 to Q404, constant current source CC4
01 are transistors Q103 to Q106 in FIG.
It has exactly the same configuration as the constant current source CC101.

(4.1) For front pin detection.

When the lens-side focus detection device 203 detects the front focus, a front focus drive signal is input to the lens drive device 204, and at the same time, the terminals T202 and T203 are set to the L level potential and the H level potential, respectively. The H level potential of this terminal T203 causes both NOR circuits NOR402 and NOR403 to output L level through the terminal T403. Therefore, the rear focus and focus display light emitting diodes L402 and L403 are turned off.
Also, the L level output of terminal T202 is output from terminal T402.
The front pin NOR circuit NOR401 is set to H level output through the front pin display light emitting diode L40.
1 lights up, AND circuit for undetectable
AND401 is set to L level output, and the light emitting diode L404 for indicating undetectable is turned off.

(4.2) For rear pin detection.

When the rear focus is detected, the lens driving device 204
The rear pin drive signal is input to terminal T20 at the same time.
2 and T203 become H level potential and L level potential, respectively. This allows the rear pin NOR circuit NOR4
Only 02 outputs H level, other circuits NOR
401, NOR403, and AND401 all output L level, so only the rear pin display light emitting diode L402 lights up.

(4.3) For focus detection.

As a result of focus detection, a motor stop signal is input to the lens driving device 204, and at the same time, both terminals T202 and T203 become L level potential. Therefore, only the focus display light emitting diode L403 lights up.

(4.4) During film exposure.

By closing the exposure switch S402 on the camera body, an L level signal is sent to the AND circuit AND401.
Further, H level signals are input to NOR circuits NOR401 to NOR403, respectively, via the inverter INV401. Therefore, all light emitting diodes L401~L
404 turns off. Further, closing the exposure switch S402 turns on the transistor Q404 and turns off the transistors Q402 and Q403. Therefore, the constant current sources CC201 and CC202 on the lens side bring both the terminals T202 and T203 to the L level potential, and a motor stop signal is input to the lens driving device 204 via the OR circuit OR206.

(4.5) For focus lock operation.

Closing the focus lock switch S204 latches the output of the lens-side focus detection device 203, so the display devices L401 to L4 of the camera body
The display of 04 is fixed. Next, a combination of the photographing lens structure shown in FIG. 2 and a camera body that does not have terminal means coupled to the terminal means 206 will be described. In FIG. 2, even if this photographic lens structure is attached to the camera body, the terminal T2 on the lens side
01 to T205 are not connected at all. Mode selection switches S202 and S203 are connected to contacts a1 and a2, respectively. When the power switch S201 is closed, power is supplied to the lens side circuit. Terminal T20
Since T2 and T203 are not connected, they are both brought to L level potential by the constant current sources CC201 and CC202. An OR circuit is formed by these two L level potentials.
In order to prevent the OR206 from outputting L level and generating a motor stop signal, set the switch S in advance.
207 is closed and an H level signal is input to the OR circuit OR206. In this manner, if the desired terminal means is not present in the camera body, the switch S207 on the lens side is closed. Thereby, the lens drive device 204 operates according to the output of the lens-side focus detection device 203. Furthermore, during film exposure,
To ensure that the photographic lens remains stationary, for example, the focus lock switch S204 may be closed or the power switch S201 may be opened prior to shutter release.

In this embodiment, a lens drive device is provided in the photographing lens structure, and a display device is provided in the camera body as response devices that respond to the focus detection signal.
However, the present invention is not limited to this,
Any type of response device may be used as long as it utilizes a focus detection signal. The display device may also be provided on the photographic lens assembly, or a motor drive device that responds to the focus detection signal may be provided on the camera body, and this output may be mechanically transmitted to the lens assembly to move the photographic lens. Good too.

As described above, according to the present invention, the focus detection signal of the lens-side focus detection device causes the display means (or lens drive means) on the camera body side and the lens drive means (or display means) on the photographic lens assembly side to
Since both are driven together, the lens driving means or display means on the lens side and the camera side can be used extremely effectively, and the display means and lens driving means on the camera body and photographing lens structure can be driven by the same focus detection device. Since the lens is driven by a focus detection signal output from the lens, there is no mismatch between the focus display and the lens position, and accurate focus display is possible. Furthermore, since the camera-side focus detection output and the lens-side focus detection output are transmitted between the lens structure and the camera body via the same terminal, the number of terminals between the lens structure and the camera body can be reduced.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the present invention showing a photographic lens assembly equipped with a focus detection device attached to a camera body equipped with a focus detection device, and FIG. 3 is a circuit diagram showing a specific circuit example of the camera body of FIG. 1; FIG. 4 is a circuit diagram of a lens structure including only a lens driving device; FIG. 5 is a circuit diagram of a camera body that includes only a display device. 100...Camera body, 101...Camera body side focus detection device, 105...Camera body side response device (display device), 107...Camera body side terminal means, 200...Photographing lens structure, 203... Lens side Focus detection device, 204... Lens side response device (lens drive device), 206... Lens side terminal means, S202, S203... Selection means (mode selection switch).

Claims (1)

[Claims] 1. A lens-side focus detection device, a lens drive means for driving a focusing lens in response to a focus detection signal from the lens-side focus detection device, or a display means for indicating a focusing state, and a plurality of lens-side focus detection devices. an exchangeable photographing lens structure having a lens-side terminal means consisting of a terminal; a camera-side focus detection device; and a display means or in-focus state responsive to a focus detection signal from the camera-side focus detection device. An automatic focusing camera comprising a camera body having a lens drive means for driving a lens, and a camera side terminal means connected to the lens side terminal means, the camera body receiving the lens side focus detection signal. , is received via the camera side terminal means, and drives the display means or the lens drive means of the camera body in response to the lens side focus detection signal, and at the same time, the photographing lens structure is configured to detect the display means of the camera body. When driven, the lens driving means of the photographing lens assembly is driven by the lens-side focus detection signal, and similarly, when the lens driving means of the camera body is driven, the lens-side focus detection signal drives the display of the photographing lens assembly. An automatic focusing camera characterized by being driven by. 2. An interchangeable photographing lens structure having a lens-side focus detection device, a lens-side response device that responds to a focus detection signal from the lens-side focus detection device, and a lens-side terminal means consisting of a plurality of terminals; and a camera side. An automatic focusing camera comprising a focus detection device, a camera-side response device that responds to a focus detection signal from the camera-side focus detection device, and a camera body having a camera-side terminal means connected to the lens-side terminal means. and a selection means capable of selecting either one of the lens-side focus detection signal of the lens-side focus detection device and the camera-side focus detection signal of the camera-side focus detection device, and the selection means , when the lens-side focus detection signal is selected, the lens-side focus detection signal drives the lens-side response device and drives the camera-side response device via the both terminal means; An automatic focusing camera characterized in that when a focus detection signal is selected, the camera-side focus detection signal drives the camera-side response device and drives the lens-side response device via the both terminal means.