JPH06100705B2 - Automatic focusing device for close-up photography - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a camera capable of switching a photographing optical system between normal photographing and close photographing depending on whether a subject distance is in a normal photographing area or a close photographing area. In regard to the automatic focusing device.

2. Description of the Related Art A macro optical system that is supported so that it can move in and out of the optical path of a shooting optical system is built-in. When performing close-up shooting, the macro optical system is advanced into the shooting optical path, and when performing normal shooting Conventionally, a camera has been proposed in which the optical system is retracted outside the photographing optical system.

In this type of camera, the one described in Japanese Utility Model Laid-Open No. 56-102521 is known as one having a built-in automatic focusing device, but in this example, the subject distance is in a normal shooting area or in a close-up shooting area. It is necessary for the user to check if there is any, and based on the judgment, not only manually operate the switching of the macro optical system into and out of the shooting optical path, but also manually perform focusing during close-up shooting. , Operation is troublesome.

An object of the present invention is to provide an automatic focusing system capable of automatically switching a photographing optical system between a normal photographing mode and a close-up photographing mode according to a subject distance and automatically focusing on any photographing area. An object of the present invention is to provide a focusing device.

SUMMARY OF THE INVENTION The automatic focusing device according to the present invention includes a focusing optical system that is movable in the optical axis direction, a first position that is located in the optical path of the focusing optical system, and a retracted position outside the optical path. The second position and the movable optical system for close-up photography, the distance measuring means for measuring the distance to the object and outputting a distance signal according to the distance, and the focusing optical system according to the distance signal. When a focusing drive mechanism that drives in the axial direction and the distance signal is a signal indicating a short distance, the close-up photography optical system is moved to the first position in conjunction with the operation of the focusing drive mechanism. The present invention is characterized in that it has a proximity drive mechanism for automatically focusing the object regardless of the distance of the subject.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 9.

In FIG. 2, reference numeral 1 is a taking lens which constitutes a focusing optical system, and is integrally connected to the lens holder 2 so that it can move back and forth in the optical axis direction.

In FIG. 1, reference numeral 3 denotes a lens control cam which constitutes a part of a focusing control mechanism, which is composed of an annular body and has a locked claw 3a on its outer periphery.
₁ , 3a ₂ , 3a ₃ , 3a ₄ , 3a ₅ and an access control cam 3b for a close-up photographing lens (hereinafter referred to as a macro lens) 4 are provided, and the front surface is inclined toward the optical axis direction of the photographing lens 1. It has cam portions 3c ₁ , 3c ₂ , 3c ₃ and is supported on a fixed base plate 5 shown in FIG. 3 so as to be rotatable around the optical axis. On the outer periphery of the lens control cam 3, a gear portion 3d that meshes with the fan gear 6 is formed. The fan gear 6 has a shaft 7
It is rotatably supported by and is biased counterclockwise in FIG. 1 by a spring (not shown). A pin 6a is provided at the tail end of the sector gear 6, and a branch 8a formed at one end of the control plate 8 is in contact with the pin 6a. The control plate 8 is formed with an elongated hole 8b, supported by fixing pins 9 and 10 which engage with the elongated hole 8b, and can slide in the left and right directions in FIGS. 1, 5, and 6. Is being done. At the time of shutter charging, the control plate 8 is locked at the left position shown in FIG. 1, and is moved to the right at a predetermined speed by the control of a governor mechanism (not shown) in response to the shutter release operation. Has been reached.

Reference numeral 11 denotes a brush which constitutes a part of focusing position signal output means which will be described later, and is fixed to the front surface of the sector gear 6, so that the brush 11 can rotate the lens control cam 3 through the sector gear 6. Rotate to the position corresponding to. On the front surface of the brush 11, a circular arc-shaped conductive pattern 12a, as shown in FIG.
The printed circuit board 12 having 12b is arranged so that the arc center of the pattern is aligned with the axis 7 of the fan-shaped gear 6, and one contact piece 11a of the brush 11 rotates with the rotation of the brush 11 and the output conductive pattern 12a.
The upper part is slidably contacted with the other contact part 11b so as to connect and disconnect to the tooth tip part of the comb tooth-shaped conductive pattern 12b connected to the high potential side. Thereby, from the output conductive pattern 12a,
One H signal (high voltage signal) is output each time the contact piece 11a comes into contact with the tip of the comb tooth-shaped conductive pattern 12b according to the sliding movement of the brush 11.

Reference numeral 13 denotes a focusing stopping means, which is composed of a locking lever 14, an automatic focusing magnet 15, and the like. The locking lever 14 is
The hook portion 14a is provided at one end thereof and the suction piece 14b is provided at the other end thereof.
It is rotatably supported by and is urged clockwise by a spring 17 in FIG. Then, the hook portion 14a is used as the engaged claws 3a ₁ , 3 of the lens control cam 3 described above.
By engaging with any of a ₂ , 3a ₃ , 3a ₄ , 3a ₅ ,
While stopping the rotation of the lens control cam 3, the suction piece
When 14b is attracted to the magnet 15, the hook 14a is maintained in a disengaged state with the locked claw. The focusing stopping means 13 also has a pressing lever 18. An arm portion 18a is formed at one end of the presser lever 18 and is rotatably supported by a shaft 19 and at the same time a spring is provided.
It is biased clockwise by 20 in FIG. A stronger biasing force is set to the spring 20 than the spring 17 of the locking lever 14 described above, and the arm portion 18a of the presser lever 18 rotates the locking lever 14 counterclockwise against the spring 17. As a result, the adsorption piece 14b is adsorbed to the magnet 15. The pressing of the suction piece 14b by the presser lever 18 is released by rotating the presser lever 18 counterclockwise against the spring 20 by a mechanism (not shown) at the initial stage of the shutter release operation. After the pressing lever 18 is released, while the magnet 15 is excited, the locking lever 14 is held at the position where the attracting piece 14b is attracted to the magnet 15, and when the magnet 15 is released from the attracting piece. 14b is released from the magnet 15, and the locking lever 14 is allowed to rotate in the clockwise direction.

The macro lens 4 is supported in front of the taking lens 1 so as to be movable in a direction (horizontal direction in FIG. 1) orthogonal to the optical axis of the taking lens 1, and the movement causes the light of the taking lens 1 to move. It is designed so that it can be set to either an advanced state positioned on the axis or a retracted state out of the optical path of the taking lens 1.

An optical system loading / unloading mechanism for moving the macro lens 4 into / out of the optical path of the taking lens 1 is configured by a loading / unloading first lever 21, a loading / unloading second lever 22, a return mechanism 23, and the like. The entrance / exit first lever 21 is provided with a recess 3 formed in the entrance / exit control cam 3b.
A hook portion 21a that engages with b ₁ and 3b ₂ and a pin 21b that abuts against the tip portion of the locking lever 14 are provided at the tip portion, and are rotatably supported by a shaft 24. Incidentally, the entrance control cam 3b is Hikakaritometsume _{3a 1, 3a 2, 3a 3} , 3a 4, 3a 5 is arranged so as to overlap the front of the recess 3b ₁ is Hikakaritometsume 3a ₁ of the hand, Corresponding to the concave portion between 3a ₂ and the other concave portion 3b ₂ is formed so as to correspond to the concave portion between the locked claws 3a ₃ and 3a ₄ .

The second lever 22 for moving in and out is a first lever for moving in and out by a pin 25.
It is pivotally supported on the tail end side of 21 and is urged clockwise by a spring 26 in FIG. On the rear side of the tip of the lever 22, a concave step 22 as shown in FIG.
a is formed, and the pin 21c projecting from the tail end side of the entrance / exit first lever 21 contacts the wall surface of the recessed stepped portion 22a, whereby the entrance / exit second lever 22 is integrated with the entrance / exit first lever 21. It is designed to rotate. Further, a protrusion 22b is formed on the front side of the front end of the second lever 22 for moving in / out, and a pin 27 provided on the rear surface of the macro lens 4 is engaged with the protrusion 22b, so that as shown in FIG. The macro lens 4 can be restricted to the rightward position retracted from the optical path of the taking lens 1. The protrusion 22b has a hole 28a (first portion) formed in a support member 28 for supporting the macro lens 4 shown in FIG.
In the initial state in which the macro lens 4 is retracted to the right position as shown in FIG. 1, the lower end surface 22b ₃ of the projection 22b is the above support member. It is pressed against the rim of the hole 28a of 28 by the action of the spring 26. As a result, a clockwise biasing force is exerted on the pin 25 of the first entrance / exit lever 21 around the lower end surface 22b ₃ of the projection 22b of the second entrance / exit lever 22, and the first entrance / exit lever 21 is rotated counterclockwise. Be urged by. Further, as described above, when the macro lens 4 is returned from the state shown in FIG. 5 to the state shown in FIG. 1 due to the double lever structure constituted by the entry / exit first lever 21 and the entry / exit second lever 22. , When the first entrance / exit lever 21 is rotated clockwise and its hook portion 21a is disengaged from the recess 3b ₁ or 3b ₂ of the entrance / exit control cam 3b (at this time, the projection of the second entrance / exit lever 22) 22b is within the movement range of the macro lens 4), the pin 27 pushes the lower edge inclined surface 22b ₁ of the protrusion 22b of the second movement lever 22 to spring only the second movement lever 22.
Since it can be rotated counterclockwise against 26, the macro lens 4 cannot easily return beyond the projection 22b to the position shown in FIG. 1 where it is again locked by the projection 22b. it can.
A spring 27a is locked to the pin 27 of the macro lens 4, and the macro lens 4 is urged by the spring 27a in the direction of advancing into the optical path of the taking lens 1. Return mechanism 23
Is a small diameter gear 29, a large diameter gear 30, a gear 31, a rack 32, a gear
It consists of 33 and 34 racks. The small diameter gear 29 meshes with the rack portion 8c formed on the front surface side of the control plate 8. Large diameter gear 30
Is integrated with the small diameter gear 29 and meshes with the gear 31. Like the control plate 8, the rack 32 is supported so as to be movable in the left-right direction in FIG. 1, and the rack portion formed on the rear surface side thereof.
The gear 31 meshes with 32a. Another rack portion 32b is formed on the upper edge of the rack 32, and the gear 33 serves as the rack portion 3b.
Like the rack 32, the rack 34 that meshes with the 2b is supported so as to be movable in the left-right direction in FIG. 1, and the rack portion 34a formed at the lower end edge thereof meshes with the gear 33. An engagement step portion 34b is formed at the right end of the rack 34,
The engagement step portion 34b engages with the protrusion 4a formed on the lower end portion of the macro lens 4 so that the macro lens 4 moves to the right as shown in FIG. 1 as the rack 34 moves to the right. It is designed to return to one direction. With the above structure of the return mechanism 23, the rack is interlocked with the movement of the control plate 8 to the left in FIG. 1 accompanying the charging operation of the shutter (not shown).
34 moves to the right, and the macro lens 4 is retracted out of the optical path of the taking lens 1. With this operation, the fan gear 6 and the lens control cam 3 described above are returned to the initial positions shown in FIG. A toothless portion 34c is formed at the left end of the rack portion 34a of the rack 34. By forming this toothless portion 34c, when the rack 34 is assembled, the rack 34
It is not necessary to set the meshing position of the gear 33 and the gear 33 strictly. That is, when the rack 34 moves to the left and is assembled into the finished state,
With a small amount of advancement to the left, in other words, rack 34
Is moved to the right so that the stroke at the time of charge operation is overcharged, so that the rack 34 slightly overcharges the macro lens 4 as shown in FIG. 6 in the first charge operation. When pushed further to the right of the gear position, the gear 33 and the rack portion 34a are disengaged and the gear 33 idles with respect to the rack portion 34a, so the rack 34 stops at the optimal mesh position with respect to the gear 33. It will be. Therefore, in the subsequent operation, the rack 34 maintains an appropriate relative positional relationship with the gear 33 and the rack 32 and does not idle. This is gear 33
Due to the excessive amount of charge on the rack 34,
This means that the overcharge amount of 34 is automatically adjusted and does not become larger than necessary, which is effective in reducing the space of the device.

FIG. 7 is a circuit diagram showing a lens stop control circuit of this automatic focusing apparatus. The operation of this automatic focusing apparatus will be described below with reference to this circuit and the signal waveform diagram shown in FIG.

A power switch (not shown) is turned on to supply power to the control circuit shown in FIG. 7, and each circuit section is reset to an initial state by a reset circuit (not shown), while NAND gates G ₁ , G ₂ , which will be described later, Depending on the initial output state of G ₃ , G ₄ and G ₅ , the magnet drive circuit 35 drives to
15 are excited. As a result, the locking lever shown in FIG.
14, the attracting piece 14b is attracted to the magnet 15, and the spring 1
It is kept counterclockwise against 7
The hook portion 14a is a locked portion 3a ₁ , 3a ₂ , 3 of the lens control cam 3.
a _4, a state in which escaped from any 3a _5. The first lever 21 for moving in and out, which has a pin 21b with which one end of the locking lever 14 abuts, is also in a pivotal position that is disengaged from the recesses 3b ₁ and 3b _{2 of the} moving control cam 3b. Then, in this initial state, the pin 27 of the macro lens 4 is locked by the projection 22b of the second lever 22 for moving in and out, and is standing by at the right position shown in FIG.

On the other hand, the timer circuit 37 operates based on the clock pulse output from the oscillator 36 by the power supply. Reference numeral 38 denotes a lens position signal output circuit, which is composed of a waveform shaping circuit including a chattering removal circuit, and outputs a shaped rectangular wave according to sliding of the contact pieces 11a and 11b of the brush 11 with respect to the conductive patterns 12a and 12b described above. To be done. The output of the circuit 38, that is, the lens position signal f is input to one input terminal of the AND gate G ₆ , and the input prohibition signal g from the timer circuit 37 is input to the other input terminal of the gate G _6. The output g of the timer circuit 37 is maintained at the L signal from the start of power supply until the respective circuit parts in FIG. 7 become stable (for example, 20 ms), during which the lens position signal f is supplied to the respective circuit parts. Prohibit input. A light emitting unit 39 receives a light emitting signal j output from the timer circuit 37 after a lapse of a predetermined time from the start of power supply, and emits pulsed light. Light emitting element 39 of the light emitting unit 39
The light from a reflects off the subject, and the reflected light
The light is received by the light receiving elements 40a and 40b.

The ratio of the amount of light received by the light receiving elements 40a, 40b differs depending on the subject distance, and the output ratio of these light receiving elements 40a, 40b is shown in FIG. 8 in the distance zones F, M, N, MC, NC. It will be the corresponding value. Distance measuring unit 40 receiving the output of the light receiving elements 40a, 40b
Then, the distance zone signal (∞,
c ₁ , c ₂ , c ₃ , c ₄ ) are output and input to the zone memory circuit 41 of the next stage. The zone memory circuit 41 includes a timer circuit 37 at the timing when the light emitting unit 39 finishes pulsed light emission.
The distance measurement completion signal k output from the distance measurement completion signal k is received through the AND gate G ₇ , the distance zone signal output from the distance measurement unit 40 is received and stored at the rising edge of the signal k, and the distance zone signal is stored in the distance zone signal. The corresponding parallel signals (a, b, c, d,
e) is output. Then, this parallel signal is input to the decoder 42 at the next stage. The decoder 42 receives the parallel signal from the zone memory circuit 41, decodes it as shown in Table 1 and outputs it. That is, With respect to the output of the zone memory circuit 41, parallel signals (p ₀ , p ₁ , p ₃ , p ₅ , p ₇ ) in which only one of p ₀ to p ₇ becomes an H signal (high voltage signal). ) Is output. Until the memory output comes in, the decoder output is normally kept only p ₃ in the H signal (high voltage signal) state. In Table 1, the lens position pulse number is the lens position output from the lens position signal output circuit 38 as the taking lens 1 travels from the initial position to the in-focus position for each distance zone of the subject. It shows the number of pulses of the signal f.

The lens position signal f is input to the lens position counter 43 through the AND gate G ₆ described above, and this counter 43 corresponds to the count value and the parallel signal (q ₀ ,
q ₁ , q ₃ , q ₅ , q ₇ ) are output. Then, while the lens position signal f is not input, only q ₀ is kept in H state and q _{1 to} q ₇ are kept in L state. Therefore, after turning on the power and before the completion of distance measurement, In each of the NAND gates G _{1 to} G ₅ in the next stage of the decoder 42, neither of the two inputs to them becomes the H signal, and each gate G _{1 to} G ₅
The output of ~G ₅ becomes all this time H signal, the output of the next stage of the AND gate G ₈ for taking a logical product of these output becomes H signal. As a result, the magnet drive circuit 35 that receives the output of the gate G ₈ is driven in the initial state before the distance measurement is completed, and the magnet 15 is in the excited state, while the engaging lever 14 of the locking lever 14 is in the magnet 15. It is kept adsorbed.

When the distance measurement completion signal k is output from the timer circuit 37 after the power is turned on, the zone memory circuit 41 receives the distance zone signal output from the distance measurement unit 40 and stores it. Assuming that the distance zone signal at this time corresponds to MC, for example, the memory output (a, b, c, d, e) of the zone memory circuit 41 is (H, L, L), as is clear from Table 1. , L, H) and the decoder
42 outputs (p ₀ , p ₁ , p ₃ , p ₅ , p ₇ ) are (L, H, L, L, L). Therefore, of the gates G _{1 to} G ₅ at this time, only the gate G ₂ receives the H signal at the input terminal connected to the decoder 42. Also, the lens position counter 43 described above
As is clear from Table 2, the outputs (q ₀ , q ₁ , q ₃ , q ₅ , q ₇ ) of (H, L, L, L, L), so at this time the gate G
Of the _{1 to} G ₅ , only the gate G ₁ inputs the H signal to the input terminal connected to the lens position counter 43. The While any this time the output of the connexion gate G ₁ ~G ₅ becomes H signal, Magunetsuto 15 keeps the energized state.

When the shutter release operation is performed in the above initial state, the presser lever 18 causes the spring 20 to move by a mechanism (not shown).
It rotates in the counterclockwise direction against, and the pressing of the suction piece 14b by the pressing lever 18 is released. Since the magnet 15 is excited in the initial state as described above, the locking lever 14 is held by the suction piece for a while after the pressing lever 18 is released.
14b is attracted to the magnet 15 and is kept in the state shown in FIG. At this time, the first lever 21 for moving in and out, in which the pin 21b is in contact with one end of the locking lever 14, is held at the position shown in FIG.

On the other hand, the control plate 8 is moved to the right from the position shown in FIG. 1 by the control of a governor mechanism (not shown) accompanying the shutter release operation. Along with this, the fan-shaped gear 6 is rotated counterclockwise by the urging of a spring (not shown), and the photographing lens 1 is guided by the cam portions 3c ₁ , 3c ₂ , 3c ₃ of the lens control cam 3 and is extended forward. . The rotation of the fan gear 6 causes the brush 11 on the fan gear 6 to be a conductive pattern on the printed circuit board 12.
By sliding on 12a and 12b, the lens position signal output circuit 38 sequentially outputs rectangular pulses as the lens position signal f.
When the lens position counter 43 counts one rectangular pulse of the lens position signal f, the counter outputs (q ₀ , q ₁ , q ₃ , q ₅ ,
q ₇ ) becomes (L, H, L, L, L) as shown in Table 2. At this time, since the two inputs of the gate G ₂ become the H signal, the output of the AND gate G ₈ is inverted from the H signal to the L signal, the magnet drive circuit 35 stops driving, and the excitation of the magnet 15 is released. Therefore, the attraction of the attraction piece 14b by the magnet 15 is released, and the locking lever 14 is allowed to rotate in the clockwise direction. At this time, the locked claw 3a _{2 of the} lens control cam 3 corresponds to the hook 14a of the locking lever 14, and the recess 3b ₁ of the access control cam 3b corresponds to the hook 21a of the first access lever 21. and came to the dynamic position, the hook 14a is thereby prevents the rotation of the lens control cam 3 engages the Hikakaritometsume 3a _2, rotation of and out the first lever 21 by the end portion of the engaging lever 14 The regulation is released and the hook portion 21a engages with the recess 3b ₁ .

When the first door lever 21 is rotated counterclockwise, the second door
The lever 22 is also driven, and the locking of the macro lens 4 by the protrusion 22b of the lever 22 is released, and the macro lens 4 is moved by the urging force of the spring 27a as shown in FIG.
To a position in the optical path of. The rightward movement of the control plate 8 associated with the shutter release operation is performed by the rack portion.
8c, the small-diameter gear 29, the large-diameter gear 30, the gear 31, and the rack portion 32a are enlarged and transmitted to the rack 32, which is moved to the right, and the rack 32 is moved to the right by the rack portion 32b,
Since it is transmitted to the rack 34 through the gear 33 and the rack portion 34a and moves to the left position shown in FIG. 5, the macro lens 4 is allowed to move to the left and the rack 34 is engaged. The projection 4a of the macro lens 4 is locked to the step portion 34b, and the macro lens 4 stops at an appropriate position in the optical path of the taking lens 1.

Due to the combination of the taking lens 1 and the macro lens 4 which are extended as described above, the distance zone MC of the subject at this time
On the other hand, the photographing optical system is in focus.

Incidentally, the rectangular pulse of the lens position signal f, hook 21a of Hikakaritometsume 3a ₁ to 3 A _5, and out the first lever 21 which hook 14a of the engaging lever 14 is engaged upon reaching the number of pulses Table 3 shows the relationship between the recessed portions 3b ₁ and 3b ₂ of the entrance / exit control cam 3b with which is engaged, and the distance zone of the object in focus at this time in the set state of the photographing optical system.

Table 3 As is apparent, relative Hikakaritometsume 3a ₁ to 3 A ₅ that hook 14a of the engaging lever 14 is engaged, where there is no recess in the corresponding entrance control cam 3b, i.e. the locking lever 14 At the feeding position of the photographing lens 1 in which is locked to the locked claws 3a ₁ , 3a ₃ , 3a ₅ , the macro lens 4 does not enter the optical path,
∞: Focusing on a normal subject distance zone such as F, M, N is performed. Note that the numbers in the focusing distance zones in Table 3 are merely examples, and may be changed as necessary.

When the shutter release operation is completed, the regulation of the presser lever 18, which has been rotated counterclockwise by a mechanism (not shown), is released, and the presser lever 18 is rotated clockwise by the urging force of the spring 20. , Its arm 18a is the locking lever 14
Then, the engaging lever 14 is pushed, and the locking lever 14 rotates counterclockwise against the spring 17. As a result, the hook portion 14 of the locking lever 14
The a unlocks the locked claw 3a _{2 and} the hook 21a of the first entrance / exit lever 21 releases the engagement with the recess 3b ₁ of the entrance / exit control cam 3b.

In parallel with this, the control plate 8 is moved from the position shown in FIG. 5 to the left position shown in FIG. 1 by the control of a governor mechanism (not shown). By this movement, the branch portion 8a of the control plate 8 pushes the pin 6a of the sector gear 6, and the sector gear 6 rotates clockwise against a spring (not shown). Along with this rotation, the lens control cam 3 rotates counterclockwise, and the taking lens 1 returns to the original feeding position.

On the other hand, the movement of the control plate 8 to the left position is performed by the small diameter gear 2
9. The gear 34 is transmitted to the rack 34 via the large-diameter gear 30, the gear 31, the rack 32, and the gear 33, and the rack 34 moves from the position shown in FIG. 5 to the right position shown in FIG. Due to the movement of the rack 34, the macro lens 4 resists the spring 28 and the photographing lens 1
The optical path is returned to the standby position shown in FIG. During this movement, the pin 27 of the macro lens 4 abuts on the lower end side of the protrusion 22b of the second entrance / exit lever 22, but resists the spring 26 that urges the second entrance / exit lever 22 in the clockwise direction. Pin 27 is the protrusion
By pushing the lower edge inclined surface 22b ₁ of 22b and rotating only the second lever 22 for moving in and out independently of the first lever 21 for moving in and out, the pin 27 is projected beyond the protruding portion 22b. 22b side edge
Locked to 22b _2, thereby the macro lens 4 to the standby position shown in Figure 1 is stopped.

In the lens stop control circuit shown in FIG.
In the AND gate G ₇ which receives the output 1 of the lens malfunction latch circuit 44 which is in the H signal output state when the power is turned on and the distance measurement completion signal k of the timer circuit 37 at each input terminal, the output m is as a memory clock. The distance zone signal from the distance measuring section 40 is input to the zone memory circuit 41 and the decoder 42 and is inverted to the H signal to output the distance zone signal from the distance measuring section 40.
However, the output m is maintained in the L signal state until the distance measurement completion signal a (H signal) is input, and this signal is inverted by the inverter G ₉ and the AND gate of the next stage. The input to one input terminal of G ₁₀ is kept in the H signal state.

Therefore, in the normal operation as described above in which the taking lens 1 is extended after the distance measurement completion signal k is issued, the gate G
_No H signal is input to the other input terminal of ₁₀ ,
During this period, the output of the gate G ₁₀ is kept at the L signal, and the output of the lens malfunction latch circuit 44 is not inverted to the L signal. Therefore, when the distance measurement completion signal k is issued, the zone memory circuit 41
Also, the input prohibited state of the decoder 42 is surely released.

On the other hand, after the prohibition of the lens position input is released (corresponding to the output g from the timer circuit 37), the photographic lens 1 runs until the distance measurement completion signal k is output and the lens 1 is moved. When the movement operation occurs when the lens position signal f is output from the position signal output circuit 38, the AND gate G
The output of ₁₀ becomes the H signal, and the output 1 of the lens malfunction latch circuit 44 is inverted to the L signal. Therefore, even if the distance measurement completion signal k is output thereafter, the output m of the AND gate G ₇ does not become the H signal. Therefore, even if distance measurement is performed, the zone memory circuit
The input prohibited state of 41 and the decoder 42 is not released, and the distance measurement result is ignored. At this time, since the decoder 42 maintains the reset initial state, the decoder output at this time is the same as that when the distance zone M in which only P ₃ is the H signal is measured as shown in Table 1. On the other hand, the lens position counter 43 continues to count the pulses of the lens position signal f as the photographing lens 1 travels, and as shown in Table 2, the number of pulses 3 which is the counter output in which only q ₃ becomes the H signal When the position counter 43 counts, the output of the gate G ₃ is inverted to the L signal, the output of the gate G ₈ is inverted to the L signal, and the excitation of the magnet 15 is released. As a result, at the time of abnormal operation, the hook portion 14a of the locking lever 14 is locked to the locked claw 3a ₃ of the lens control cam 3 at the extended position of the taking lens 1 corresponding to the pulse number 3 of the lens position signal f. The taking lens 1 stops at the in-focus position with respect to the distance zone M.

The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the position of the first entrance / exit lever 21 is determined by the locking position of the lens control cam 3 by the locking lever 14, and the position of the macro lens 4 is set accordingly. However, with such a configuration, it is not possible to set the same position as that of the taking lens 1 in the normal shooting and the close-up shooting. Therefore, if another control mechanism for determining the entrance / exit of the macro lens 4 according to the distance signal is provided, the entrance / exit of the macro lens 4 can be controlled independently of the locking position of the photographing lens 1. . Therefore, it is not necessary to reduce the number of locking positions in the normal photographing area for close-up photographing. FIG. 10 shows a partial circuit of an embodiment having such a configuration.

In this embodiment, the first access lever 21 in the previous embodiment is used.
To operate independently without engaging the locking lever 14,
This in-out first lever 21 is controlled by another magnet 46. In Figure 10, decoder 42 alternatively to H signal one of the output terminals z ₁ to z ₇ in accordance with the measurement result. Here, when the output of the terminal z ₁ becomes the H signal, the subject is at the farthest position, and the subject is detected at a closer distance as z ₂ , z ₃ ,. When the output of the terminals z ₆ and z ₇ becomes an H signal, it is necessary to use a macro lens.

The lens position counter 43 is similar to that of the above-described embodiment, and the table 2
As described above, any one of the outputs of the terminals q _{0 to} q ₇ outputs the parallel signal which becomes the H signal alternatively. 46 is the first lever 21 for moving in and out.
To hold the macro lens 4 in the locked position,
45 is its control circuit.

Now, when only the output of the terminal z ₂ is the H signal, the output of the OR gate G ₁₁ becomes the H signal. Then, when the photographing lens is moved and only the output of the terminal q ₁ of the lens position counter 43 becomes the H signal, the output of the NAND gate G ₂ is inverted to the L signal, and the output of the AND gate G ₈ is also inverted to the L signal. . By this signal, the magnet drive circuit 35 demagnetizes the magnet 15, and the feeding of the photographing lens is locked.

In this case, since the outputs of the terminals z ₆ and z ₇ are both L signals, the output of the OR gate G ₁₃ is also an L signal, and the magnet drive circuit 45 demagnetizes the magnet 46. Here, in the magnet 46, a permanent magnet is used for the magnetic core, and in the demagnetized state, the magnetic force of the permanent magnet holds the first lever 21 for moving in and out at the macro lens locking position and when it is excited. The magnetic force of the permanent magnet is canceled to unlock the macro lens, and the macro lens 4 is moved into the optical path of the taking lens 1.

By the way, when only the output of the terminal z ₆ of the decoder 43 is the H signal, the output of the OR gate G ₁₁ becomes the H signal, the lens is moved, and only the output of the terminal q ₁ of the lens position counter 43 becomes the H signal. When grabbing, the movement of the lens is blocked as described above. At the same time, when the output of the terminal z ₆ becomes the H signal, the output of the OR gate G ₁₃ becomes the H signal, and the magnet 4
6 is excited, and the lock of the macro lens 4 is released.
At this time, in the taking lens 1, only the output from the terminal z ₂ is H level.
It is locked in the same position as in the signal state.

Effect The automatic focusing device according to the present invention includes the focusing optical system movable in the optical axis direction, the first position located in the optical path of the focusing optical system, and the second position retracted from the optical path. , A distance measuring means for measuring the distance to the object and outputting a distance signal according to the distance, and the focusing optical system according to the distance signal. A focusing drive mechanism that drives in a direction, and when the distance signal is a signal indicating a short distance,
Since the close-up optical system is provided with a close-up drive mechanism that moves the close-up optical system to the first position in conjunction with the operation of the focusing drive mechanism, the close-up optical system is used for normal shooting and close-up shooting according to the subject distance. There is an effect that it is possible to automatically switch to and, and to automatically perform focusing on any of the photographing areas, which makes it easy to operate and enables accurate focusing.

[Brief description of drawings]

FIG. 1 is a schematic front view showing an embodiment of the present invention, FIG. 2 is a side sectional view thereof, FIG. 3 is a sectional plan view thereof, FIG. 4 is a plan view of a printed circuit board, and FIG. FIG. 6 is a front view showing a lens advance state, FIG. 6 is a front view showing an overcharge state, FIG. 7 is a lens stop control circuit, FIG. 8 is an explanatory view showing a relationship between a distance measuring optical system and a subject distance zone, and FIG.
The figure shows the timing chart of the lens stop control circuit,
FIG. 10 shows a control circuit of another embodiment. 1 ... Shooting lens (focusing optical system), 4 ... Close-up shooting lens (close-up shooting optical system), 39 ... Light emitting unit (distance measuring unit), 40 ... Distance measuring unit (distance measuring unit), 41 ... Zone Memory circuit (distance measuring means), 42 ... Decoder (distance measuring means), 3 ... Lens control cam (control means), 11 ... Brush (control means), 12 ... Printed circuit board (control means), 13 ... Stop for focusing Means (control means), 21 ... In / out first lever (control means), 22 ... In / out second lever (control means), 23 ... Return mechanism (control means), 38 ... Lens position signal output circuit (control means), 43 ... Lens position counter (control means)

Claims (1)

[Claims] 1. A focusing optical system movable in the optical axis direction, a first position located in the optical path of the focusing optical system, and a second position retracted to the outside of the optical path. A possible close-up optical system, a distance measuring unit that measures the distance to the subject and outputs a distance signal according to the distance, and when the distance signal indicates a distance closer than a predetermined distance,
A proximity drive mechanism for moving the close-up photography optical system to the first position; a case where the distance signal indicates a distance shorter than the predetermined distance, and a case where the distance signal indicates a distance longer than the predetermined distance. In the above, the distance signal and the plurality of stop positions of the focusing optical system have a relationship in advance so that at least a part of the stop position range of the focusing optical system overlaps each other. A focusing unit for outputting a position signal indicating a position where the focusing optical system should be stopped; and a focusing drive mechanism for driving the focusing optical system in the optical axis direction according to the position signal. An automatic focusing device capable of close-up photography.