JP2532771B2 - Camera drive - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera driving device for driving a driven member by an electric driving source such as a motor.

[0002]

2. Description of the Related Art In recent years, automation of cameras has advanced, and driven members such as an optical system and a film have been driven by an electric drive source such as a motor. Further, there is also proposed a camera which employs a driving device that drives these various driven members by a single electric drive source to achieve miniaturization. This camera is provided with a plurality of driven members in which all or part of the period to be driven is deviated. In order to drive each of these driven members without any inconvenience, in this drive device, a clutch is provided in the transmission mechanism that transmits the driving force from the electric drive source to each of the driven members, and these clutches are disengaged in a timely manner. Each drive mechanism was driven in a timely manner. As the clutch, a friction clutch or a one-way clutch has been adopted in addition to the normal clutch.

However, since these clutches have a complicated structure, they have been a factor that hinders downsizing and cost reduction of the camera. Further, in the case of a friction clutch or a one-way clutch, the input member that is always interlocked with the electric drive source and the output member that is always interlocked with the driven member are in contact with each other even when the transmission of the driving force is cut off, The friction generated thereby imposes an unnecessary load on the electric drive source and wastes the electric power of the electric drive source.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a driving device for a camera which has a simple structure and does not waste the power consumption.

[0005]

To achieve the above object of the Invention The present invention is in the driving device for a camera, a driving unit for generating a driving force, the driving force emitted from the drive unit
A main optical system that is transmitted and displaced, a sub optical system, and a driving force generated by the driving device as a relative displacement driving force for relatively displacing the sub optical system with respect to the main optical system. and a transmitting member for transmitting the to the secondary optical system, said transmission member, before the relative movement driving force during the focal length switchover
Serial with a transmission region for transmitting for the secondary optical system, and a non-transfer area to break the transmission of the relative displacement drive force at the time of photographing distance adjustment to the secondary optical system. In the following description of the embodiments of the present invention, the "main optical system" of the present invention is referred to as the "first optical system".
And the "sub optical system" is referred to as the "second optical system".

[0006]

Embodiments of the present invention will be described below with reference to the drawings. The present embodiment is a camera in which the focal length changes by switching the optical system. 1 to 3 respectively show plan views of an embodiment of the present invention. In each drawing, a dustproof cover 2 is provided on the front surface of the camera body 1 in the left-right direction in the drawings.
The first optical system 3 is provided so as to be displaceable in the optical axis direction (vertical direction in the drawing), that is, extendable and retractable. A direction in which the second optical system 4 traverses the optical axis of the first optical system 3 inside the camera body 1 between the optical path of the first optical system 3, that is, the position inserted into the photographing light beam and the position retracted from the light beam. It is provided so as to be displaceable in the left-right direction in the figure. A focal length selection member 5 for switching the focal length of the optical system is provided on the upper surface of the camera body 1 so as to be always operable.

In FIG. 1, the dustproof cover 2 is in the open position. The focal length selection member 5 is at the telephoto position where the focal length of the first optical system 3 is in the telephoto region, and faces the letter “T” attached to the upper surface of the camera body 1. The first optical system 3
The second optical system 4 is located at the projecting position protruding from the front surface of the dust-proof cover 2 and is located at the insertion position to form a composite optical system, and the focal length is in the telephoto area.

In FIG. 2, the dustproof cover 2 is in the open position. The focal length selection member 5 is at a wide-angle position that makes the focal length of the first optical system 3 a wide-angle region, and faces the letter “W” attached to the upper surface of the camera body 1. At this time, the first optical system 3 is in the retracted position where it is retracted into the camera body 1 from the retracted position, and the second optical system 4 is in the retracted position. First
The optical system 3 has a wide-angle focal length.

In FIG. 3, the dustproof cover 2 is in the closed position and covers the first optical system 3. At this time, the first optical system 3
Is in the retracted position even though the focal length selection member 5 is in the telephoto position, and the second optical system 4 is in the retracted position.
When the dustproof cover is in this closed position, an index 2a attached to the upper surface of the dustproof cover 2 is attached to the upper surface of the camera body 1 in order to make it visible from the top of the camera that photography is impossible. The character "OFF" is opposite.

A switch Sw in which a sliding contact piece is fixed to the dustproof cover 2 is provided at a part of the camera body of FIG.
1 and a switch Sw2 having a sliding contact piece fixed to the focal length selection member 5 are shown. The switch Sw1 is turned on when the dust cover 2 is at the open position, and is turned off when the dust cover 2 is displaced from the open position toward the closed position. This switch Sw1
Controls the rotation direction of a motor 12 described later that displaces the first optical system 3, and also controls a shutter control circuit 31 described later.
Control the power supply to.

The switch Sw2 is switched in accordance with the position of the focal length selection member 5 to control the rotation direction of a motor 12, which will be described later, which displaces the first optical system 3. Switch Sw2
Is ON when the focal length selection member 5 is in the telephoto position and OFF when it is in the wide-angle position. FIG. 4 shows the first
It is a perspective view which shows the mechanism which makes an optical system go straight ahead to an optical axis direction.

The figure shows the state when the first optical system 3 is in the extended position. An opening 10a through which a photographing light flux passes is provided in the center of the base plate 10, and an aperture / shutter device 11 and a first optical system 3 shown by a chain line are fixedly provided in front of the opening 10a. A motor 12 is fixedly installed on the upper back surface of the base plate 10. Both ends of the rotary shaft are connected to the motor 1
The two casings penetrate both end faces and project respectively. A bevel gear 12a (shown in FIG. 5) is provided at one end of the rotary shaft.
Is fixed. This bevel gear 12a has a base plate 10
The bevel gear 13 pivotally supported on the
A gear 14 that is also axially supported by the base plate meshes with the spur teeth of the. A through hole is formed in the center of the gear 14, and a female screw whose center is the rotation center of the gear 14 is cut in the through hole. A male screw cut on the guide shaft 15 is screwed into the female screw. The guide shaft 15 extends in the optical axis direction, has a distal end fixed to the substrate 1a of the camera body, and a distal end inserted into the through hole 10b of the base plate 10 so as to be slidable in the axial direction. A bevel gear 12b is fixed to the other end of the rotation shaft of the motor 12. A bevel gear 16 axially supported by the base plate 10 is engaged with the bevel gear 12b, and an input gear 17a of a gear train 17 axially supported by the base plate 10 is engaged with a spur tooth portion of the gear 16. Gear train 17
Has a through hole at the center of the output gear 17b of
A female screw whose axis is the rotation center of the gear 17b is formed in the through hole. A male screw cut on the guide shaft 18 is screwed into the female screw. The guide shaft 18 extends in the optical axis direction, and the end is fixed to the substrate 1a of the camera body,
The tip is inserted into the through hole 10c of the base plate 10 so as to be slidable in the axial direction. Gears 14, 1 for a certain amount of rotation of the motor
The amount and direction of rotation of 7b are set to be equal, and the screwing condition of gear 14 and guide shaft 15 and the screwing condition of gear 17b and guide shaft 18 are also set equal. A guide shaft 19 extending in the optical axis direction is also planted in the substrate 1a. The guide shaft 19 is axially slidably inserted into the through hole 10e of the overhanging portion 10d and the through hole 10f of the base plate 10, which are provided on the back surface of the base plate 10.

With this structure, when the motor 12 rotates, the base plate 10 is kept perpendicular to the optical axis by the screw engagement between the gear 14 and the guide shaft 15 and the screw engagement between the gear 17b and the guide shaft 18. The first optical system 3 and the diaphragm / shutter device 11 fixedly moved in parallel to the optical axis direction are displaced in the optical axis direction between the feeding position and the feeding position. A printed circuit board 20 is fixed to the right side surface of the base plate 10. Conductor lands 20a to 20c are provided on the surface of the printed circuit board 20, and these are fixed to the camera body.
The two sliding contact pieces 21 to 23 are capable of sliding contact with each other. The switch Sw is formed by the sliding contact piece 21 and the conductor land 20a.
3 is a switch S with the sliding contact piece 22 and the conductor land 20b.
A switch Sw5 is constituted by the sliding contact piece 23 and the conductor land 20c. The switch Sw3 is the first
When the optical system 3 is in the feeding position, the switch Sw4 is in the feeding position, and the switch Sw5 is in the middle between the feeding position and the feeding position. Switches Sw3, S
w4 functions as a limit switch, and cuts off the power supply to the motor 12 when the first optical system 3 is displaced to the retracted position or the retracted position. The switch Sw5 is a switch for disabling shutter release when the first optical system 3 is located at an intermediate position between the above two positions and a subject image cannot be formed on the film surface. This is a switch for cutting off the power supply to the control circuit 30 (shown in FIG. 6).

The film 24 is arranged behind the photographing opening formed in the substrate 1a. FIG. 5 is a perspective view of an insertion / removal mechanism that inserts / removes the second optical system into / from the imaging light flux. An embodiment of the present invention will be disclosed in the insertion / removal mechanism. In the figure, a reduction gear train 25, a cam gear 26, and a drive member 27 are pivotally supported on the back surface of the base plate 10, and the drive member 27 holds the second optical system 4. Reduction gear train 2
The input gear 25 a of No. 5 meshes with the spur gear portion of the bevel gear 13, and the final gear 25 b of the reduction gear train 25 meshes with the cam gear 26. The cam gear 26 and the drive member 27 are coaxial with each other, and they are coupled to each other via a front cam 26a as an output member provided on the end surface of the cam gear 26.

The reduction gear ratio of the reduction gear train 25 is set as follows. That is, when the first optical system 3 is at the payout position, the second optical system 4 is placed at the insertion position (shown by the solid line) where it is inserted in the photographing light beam, and when the first optical system 3 is at the payout position, The second optical system 4 is arranged at a retracted position (illustrated by a chain double-dashed line) retracted from the photographing light flux. 6 to 9 show sectional views of the insertion / removal mechanism.

In each of the drawings, the first optical system 3 and the diaphragm / shutter device 11 are fixedly mounted on the base plate 10 in front of the opening 10a, and the positioning means 28 for the second optical system 4 is located behind the opening 10a. Are formed. The positioning means 28 is composed of an inner cylindrical surface 28a having the optical axis of the first optical system 3 as an axis, a guide surface 28b in the shape of a platter, and a contact surface 28c orthogonal to the optical axis of the first optical system 3. The positioning means 28 has a second
A holding cylinder 4a for integrally holding the optical system 4 is engageable, and the optical axis of the second optical system 4 is aligned with the optical axis of the first optical system 3 in the extended position at the time of engagement, and The second optical system 4 is positioned at a predetermined position in the optical axis direction. This optical axis alignment is performed by inserting a small tube 4c protruding from the front end surface 4b of the holding tube 4a into the inner tube surface 28a of the positioning means 28, and positioning in the optical axis direction is the end surface 4b of the holding tube 4a.
Is brought into contact with the contact surface 28c of the positioning means 28.

The driving member 27 is axially slidably supported by a fixed shaft 10g planted in the base plate 10 via a bearing portion 27a. The drive member 27 is formed with an inner circumferential groove 27b that accommodates the second optical system 4 in a loosely fitted state. Second
The holding cylinder 4a of the optical system 4 has a collar 4d around the entire circumference.
Is provided, and between the inner circumferential groove 27b and the collar 4d,
The coil spring 29 is inserted. This spring 29 positions the second optical system 4 brought to the insertion position by the positioning means 28.
It acts to urge in the direction of contact with. A cam gear 26 is also supported by the shaft 10g, and a sliding contact portion 27c provided at one end of a drive member 27 can slidably contact a front cam 26a formed on this end surface. The drive member 27 is attached to the shaft 10g.
Bearing member 27a is sandwiched between the upper and lower flanges 10h, 1
0i is fixed, and a spring 30 is inserted between the flange 10h and the rear end surface of the drive member 27. The spring 30 functions to press the sliding contact portion 27c of the driving member 27 against the cam 26a or press the front end surface of the bearing portion 27a against the collar 10i. Locking members 10j and 10k that lock the free end 27d of the driving member 27 are planted on the base plate 10. The locking member 10j is a driving member when the second optical system 4 is brought to the insertion position. 27 swinging is locked, and the locking member 10k is
The swing of the drive member 27 is locked when the optical system 4 is brought to the retracted position. Also, near the end of the locking member 10k,
A circular hole 10l is provided in which the small cylinder 4c of the second optical system 4 brought to the retracted position falls in a loosely fitted state.

FIG. 6 shows a state in which the second optical system 4 is in the insertion position and in the position engaged with the positioning means 28 (hereinafter referred to as the complete insertion position). FIG.
The state is shown when the second optical system 4 is at the insertion position, but is at a position where it is pushed up by the cam 26a and does not engage with the positioning means 28 (hereinafter referred to as an incomplete insertion position).
Although the second optical system 4 is in the retracted position in FIG.
The state is shown when c is in a position where it does not fall into the circular hole 101 (hereinafter referred to as an incomplete retracted position). FIG. 9 shows the second
The position where the optical system 4 is at the retracted position and the small cylinder 4c has dropped into the circular hole 10l (hereinafter referred to as an incomplete retracted position)
It shows the state when.

In this embodiment, the electric drive source in the present invention is the motor 12, the driven member is the second optical system 4, the transmission mechanism is the bevel gears 12a and 13, the gear train 25, the cam gear 26, the front cam 26a, The output member corresponds to the front cam 26a, the input member corresponds to the drive member 27, the support member corresponds to the flange 10i, and the biasing member corresponds to the spring 30, respectively.

FIG. 10 shows a cam diagram of the cam 26a. The cam 26a has a first flat section A in which the lift angle does not change at 0 from Θ1 to Θ1 and a first slope section B in which the head height increases linearly from 0 to h1 from Θ1 to Θ2, and Θ2 to The second flat section C where the head h does not change at h1 over Θ3 and the second slope section D where the head h decreases linearly from h1 to 0 over Θ3 to 360 °.
It consists of and.

The cam 26a has three functions for the second optical system 4. The first is the action of displacing the second optical system 4 in the optical axis direction of the first optical system 3 between the completely inserted position and the incompletely inserted position. The second is the action of displacing the second optical system 4 in a direction crossing the optical axis of the first optical system 3 between the incompletely inserted position and the incompletely retracted position. The third is the action of displacing the second optical system 4 in the optical axis direction of the first optical system 3 between the incomplete retracted position and the complete retracted position. Details will be described later.

FIG. 11 shows a motor control circuit for driving the optical systems 3 and 4 of this embodiment. In the figure, the motor 12 is driven by three power supply paths. The first path is the positive electrode of the power supply E-the switch Sw3-the switch Sw.
7a-motor 12-switch Sw7b-negative electrode path of the power supply E. When power is supplied through this path, the motor 12 rotates to displace the first optical system 3 to the retracted position and the second optical system 4 to the retracted position.

The second path is the positive pole-switch S of the power supply E.
w4-switch Sw8a-motor 12-switch Sw8
b-The path of the negative electrode of the power supply E. By supplying power through this path, the motor 12 rotates in the direction opposite to that in the case of the first path, displacing the first optical system 3 to the feeding position and displacing the second optical system 4 to the insertion position. Let Here, the switches Sw7a, Sw7b, Sw8a, and Sw8b are semiconductor switches whose opening and closing are controlled by a logic circuit 40 (shown in FIG. 10) described later.

The third path is a path connecting the automatic focus adjustment / shutter control circuit 31 and the motor 12, and the output of the control circuit 31 causes the motor 12 to rotate in the forward and reverse directions to move the optical system in the optical axis direction. Move it back and forth to bring it into focus. A switch Sw connected in series is provided in the power supply path of the control circuit 31.
1a and Sw5 are inserted. The switch Sw1a is
The semiconductor switch is controlled by the switch Sw1 and is opened and closed in the same phase as the switch Sw1, and is turned on only when the dust cover 2 is in the open position. The switch Sw5 is turned on only when the first optical system 3 is in the extended position and the retracted position (when the second optical system 4 is in the completely inserted position and the completely retracted position). As a result, it is possible to prevent the automatic focus adjustment and the operation of the shutter when the dust cover 2 and the optical systems 3 and 4 are in positions unsuitable for photographing.

FIG. 12 shows a logic circuit 40 which controls the operation of the motor control circuit of FIG. This logic circuit 4
0 has a pair of input terminals 40a and 40b and a pair of output terminals 40c and 40d. The input terminal 40a is between the switch Sw1 and the ground resistance, the input terminal 40b is between the switch Sw2 and the ground resistance, the output terminal 40c is the control terminal of the switches Sw7a and Sw7b, and the output terminal 40d is the switch Sw8a, 8b are respectively connected to the control terminals. The input terminal 40a is a switch S
When w1 is ON, that is, when the dust cover 2 is in the open position, the level is High, and when switch Sw1 is OFF, that is, the dust cover 2 is in the closed position, the level is Low. The input terminal 40b becomes High level when the switch Sw2 is ON, that is, when the focal length selection member 5 is in the telephoto position, and becomes Low level when the switch Sw2 is OFF, that is, when the focal length selection member 5 is in the wide-angle position. Become. The output terminal 40c turns on both the switches Sw7a and Sw7b when it is at the high level, and turns off both when it is at the low level. The output terminal 40d turns on both the switches Sw8a and Sw8b at the time of High level, and turns off both at the time of Low level.

The input terminal 40a of the logic circuit 40 is connected to one input terminal of the exclusive OR circuit 40e and one input terminal of the NOR circuit 40f. The input terminal 40b is connected to the other input terminal of the exclusive OR circuit 40e and the other input terminal of the NOR circuit 40f. The output terminals of both circuits 40e and 40f are connected to both input terminals of the OR circuit 40g, respectively. The output terminal of the OR circuit 40g is the output terminal 40c of the logic circuit 40.
Is connected to the input terminal of the inverter 40h, and the output terminal of the inverter 40h is the output terminal 40d of the logic circuit 40.
It is connected to the.

In the table below, the position of the dustproof cover 2 and the position of the focal length selection member 5 are switched according to these positions.
The states of the switches Sw1 and Sw2, the levels of the input terminals 40a and 40b and the output terminals 40c and 40d of the logic circuit 40,
The relationships among the states of the switches Sw7a, Sw7b, Sw8a, and Sw8b and the positions of the first optical system 3 and the second optical system 4 are summarized.

[0028]

[Table 1]

[1] As shown in FIG. 1, when the dust cover 2 is in the open position, the focal length selection member 5 is in the telephoto position, and the first optical system 3 is already in the extended position, the switch Sw is switched.
Since both 1 and Sw2 are in the ON state, the logic circuit 40
The input terminals 40a and 40b of the both become high level.
The output terminals of the exclusive OR circuit 40e and the NOR circuit 40f become Low level, and the output terminal of the OR circuit 40g also becomes Low level. The output terminal 40c of the logic circuit 40,
40d becomes Low and High level, respectively. As a result, the switches Sw7a and Sw7b shown in FIG. 6 are turned off, and the switches Sw8a and Sw8b are turned on. Since the first optical system 3 is at the extended position, the switches Sw3, Sw4, and Sw5 are turned on, off, and turned on, as shown in FIG.
It is in the ON state. Switches Sw7a and Sw7b are OF
Since it is F, the first path is not formed, and the switch S
Since w4 is OFF, the second route is not formed either.

In this case, the first optical system 3 is stationary in the extended position, and the second optical system 4 is stationary in the fully inserted position in which the positioning means 28 is completely engaged as shown in FIG. A composite optical system is constituted by, and its focal length is in the telephoto range. Both switches Sw1a and Sw5 are O.
Since it is N, the automatic focus adjustment / shutter control circuit 31
Is in an operable state and is capable of shooting with the telephoto optical system. FIG. 1 shows the state at this time.

In accordance with the operation of starting the photographing, the motor 12 is supplied with electric power through the third path to rotate and displaces the optical systems 3 and 4 in the optical axis direction from the close-up of the telephoto area to the infinity to perform focus adjustment. Let During rotation of the motor 12 for focus adjustment in this telephoto region, the front end surface of the bearing portion 27a of the drive member 27 is in contact with the flange 10i by the biasing force of the spring 30, so that the sliding contact portion of the drive member 27 is in contact. 27c is the first of the cam 26a
It only faces the flat section A and does not make contact. Therefore, the sliding contact portion 27c does not become a load on the motor 12, and the second optical system 4 is not vibrated to adversely affect the subject image at the time of shooting. [2] When the focal length selection member 5 is switched to the wide-angle position from the state shown in FIG. 1, the switch Sw2 is turned off, and the input terminal 40b of the logic circuit 40 becomes low level. The output terminal of the exclusive OR circuit 40e is Hig.
Since it becomes the h level, the output terminal of the OR circuit 40g is Hig.
It is inverted to the h level and output terminals 40c, 4 of the logic circuit 40
0d is inverted to High and Low levels, respectively. As a result, the switches Sw7a and Sw7b shown in FIG. 6 are turned on, and the switches Sw8a and Sw8b are turned off. First
Since the optical system 3 is at the feeding position, the switches Sw3, Sw4, and Sw5 are turned on and OF, respectively, as shown in FIG.
Since the switches Sw7a and Sw7b are ON in the F and ON states, the first path is formed and the motor 1
2 starts. Therefore, the first optical system 3 starts to be displaced from the feeding position toward the feeding position.

The second optical system 4 is fully inserted into the positioning means 28 by the initial rotation of the motor 12 (see FIG. 6).
(Shown in FIG. 7) to the incomplete insertion position (shown in FIG. 7) in which it displaces in the optical axis direction and does not engage. This displacement in the optical axis direction is due to the cam 26a rotating clockwise from the state shown in FIG. 5 and pushing up the sliding contact portion 27c of the drive member 27 in the first slope section B. When the second optical system 4 reaches the incompletely inserted position and disengages from the positioning means 28, the drive member 27 can swing in the direction traversing the optical axis.
With the subsequent rotation of the motor 12, the sliding contact portion 27c is pushed by the first slope section B and swings clockwise in the plane crossing the optical axis of the first optical system 3, and at this time, the second optical system 4 moves. The end surface of the small cylinder 4c slides on the back surface of the base plate 10. When the first optical system 3 approaches the retracted position, the free end 27d of the driving member 27 is locked by the locking member 10.
The second optical system 4 reaches the incomplete retracted position where the second optical system 4 is not inserted into the circular hole 10l while coming into contact with the k and being prevented from swinging. Since the motor 12 continues to rotate thereafter, the sliding contact portion 27c of the drive member 27 moves up the first slope section B of the cam 26a and reaches the second flat section C (shown in FIG. 8). Subsequently, the sliding contact portion 27c slides down the second slope section D, but the front end surface of the bearing portion 27a abuts on the flange 10i in the middle thereof, so that the sliding contact portion 27c is separated from the cam 26a, and the first flat surface is formed. Although it faces the section A, it reaches a state where it does not contact. Due to this displacement of the drive member 27 in the optical axis direction, the small cylinder 4c of the second optical system 4 is inserted into the circular hole 10l of the base plate 10, and the end surface 4b of the holding cylinder 4a contacts the edge of the circular hole 10l. They come into contact with each other and reach the complete retracted position (shown in FIG. 9). At this time, the first optical system 3 has reached the retracted position.

After the front end surface of the bearing portion 27a comes into contact with the collar 10i, the driving member 27 stops the displacement in the optical axis direction, and then the spring 29 serves as a biasing force for inserting the second optical system 4 into the circular hole 10l. Supply. When the first optical system 3 reaches the retracted position, the switches Sw3, Sw4, Sw5 shown in FIG.
Are in the OFF, ON, and ON states, respectively. When the switch Sw3 is turned off, the first path is cut off,
The power supply to the motor 12 is stopped. Therefore, the first optical system 3
Is the retracted position and the second optical system 4 is stationary at the retracted position. Therefore, the optical system is composed of only the first optical system 3 and its focal length is in a wide-angle region. In addition, the switch Sw1a,
Since both Sw5 are ON, the automatic focus adjustment / shutter control circuit 30 is in an operable state, and the wide-angle optical system can perform photographing. FIG. 2 shows the state at this time.

In accordance with the photographing start operation, the motor 12 is supplied with electric power through the third path to rotate, and displaces the optical system 3 in the optical axis direction from the close-up of the wide-angle region to the infinity to perform focus adjustment. Motor 12 for focus adjustment in this wide-angle range
During the rotation, the sliding contact portion 27c of the drive member 27 only faces the first flat section A but does not contact it, so that the drive member 27 does not move and the second optical system 4 remains in the completely retracted position. . Further, the sliding contact portion 27c does not become a load on the motor 12. [3] When the dustproof cover 2 is displaced from the open position to the closed position from the state shown in FIG. 1, the switch Sw1 is turned off, the input terminal 40a of the logic circuit 40 becomes Low level, and the exclusive OR circuit 40e. Output terminal is Hig
H level. The subsequent operation is the same as in [2]. Even though the focal length selection member 5 is at the telephoto position, the first optical system 3 is displaced from the extended position toward the retracted position, and the second optical system 4 is completely moved. It is displaced from the insertion position toward the fully retracted position. Since the first optical system 3 is at the retracted position, the dustproof cover 2
Can be displaced to the closed position. When the dustproof cover 2 reaches the closed position, the switch Sw1a in the same phase as the switch Sw1 is turned off, so that the power supply to the automatic focus adjustment / shutter control circuit 30 is cut off and the photographing becomes impossible. FIG. 3 shows the state at this time. [4] When the dustproof cover 2 is displaced to the closed position from the state shown in FIG. 2, the switch Sw1a having the same phase as the switch Sw1 is switched.
Is turned off, the power supply to the automatic focus adjustment / shutter control circuit 30 is cut off, and photographing is impossible. [5] When the focal length selection member 5 is switched to the telephoto position from the state shown in FIG. 2, the switch Sw2 is turned on, and the input terminals 40a and 40b of the logic circuit 40 are both Hig.
H level. Since the output terminals of the exclusive OR circuit 40e and the NOR circuit 40f both become Low level,
The output terminal of the OR circuit 40g is inverted to Low level, and the output terminals 40c and 40d of the logic circuit 40 are Low and H, respectively.
Reverse to igh level. As a result, the switches Sw7a and Sw7b shown in FIG. 6 are turned off, and the switch Sw8 is turned on.
a and Sw8b are turned on. Since the first optical system 3 is in the retracted position, the switches Sw3, Sw4, Sw5 are in OFF, ON, and ON states, respectively. Switch Sw8
Since a and Sw8b are ON and the switch Sw4 is ON, the second path is formed, and the motor 12 starts rotating in the direction opposite to that in [2]. Therefore, the first optical system 3 starts to be displaced from the feeding position toward the feeding position.

By the initial rotation of the motor 12, the second optical system 4 is displaced in the optical axis direction from the completely retracted position (shown in FIG. 9) to come out of the circular hole 10l and incompletely retracted position (shown in FIG. 8). ). The displacement in the optical axis direction is caused by the rotation of the cam 26a and the sliding contact portion 27c of the drive member 27 in the second slope section D.
By pushing up. When the second optical system 4 comes out of the circular hole 101, the driving member 27 can swing in the direction crossing the optical axis of the first optical system 3. As the motor 12 continues to rotate, the sliding contact portion 27c is pushed by the second slope section D in the direction crossing the optical axis, so that the drive portion 27 swings in the same direction, and the small tube 4c of the second optical system 4 is moved. End surface slides on the back surface of the base plate 10 from the incomplete retracted position toward the incompletely inserted position (shown in FIG. 7). When the first optical system 3 approaches the extended position, the free end 27d of the drive member 27 contacts the locking member 10j and its swing is blocked, and the second optical system 4 stops at the incomplete insertion position. Since the motor 12 continues to rotate thereafter, the sliding contact portion 27c of the drive member 27 climbs up the second slope section D of the cam 26a and reaches the second flat section C (shown in FIG. 7). Subsequently, the sliding contact portion 27c slides down the first slope section B, but the front end surface of the bearing portion 27a contacts the flange 10i in the middle thereof, so that the sliding contact portion 27c moves to the cam 26.
Although it is separated from a and faces the first flat section A, it reaches a state where it does not contact. Due to the displacement of the drive member 27 in the optical axis direction accompanying this, the small cylinder 4c of the holding cylinder 4a of the second optical system 4 comes into contact with the guide surface 28b of the positioning means 28, and is guided by the guide surface 28b of the positioning means 28. 28a, and the end surface 4b of the holding cylinder 4a.
Comes into contact with the contact surface 28c of the positioning means 28, reaches the complete insertion position shown in FIG. 6, and the positioning of the second optical system 4 is completed. At this time, the first optical system 3 has reached the delivery position.

The urging force for engaging the second optical system 4 with the positioning means 28 after the drive member 27 stops the displacement in the optical axis direction by the contact of the bearing portion 27a with the collar 10i,
Spring 29 supplies. When the first optical system 3 reaches the extended position, the switches Sw3 and Sw are switched as described in [1].
4 and Sw5 are in ON, OFF, and ON states, respectively. When the switch Sw4 is turned off, the second path is cut off and the power supply to the motor 12 is stopped. Therefore, as shown in FIG. 1, the first optical system 3 is stationary at the extended position and the second optical system 4 is stationary at the fully inserted position to form a composite optical system, and its focal length is in the telephoto range. Further, since the switches Sw1a and Sw5 are both ON, the automatic focus adjustment / shutter control circuit 30 is in an operable state, and photographing with the telephoto optical system is possible. [6] When the dust cover 2 is displaced from the state shown in FIG. 3 toward the open position, the switch Sw1 is turned on,
The input terminals 40a and 40b of the logic circuit 40 are both at the high level. The following is the same operation as described in [5].

[0037]

As described above, according to the present invention, the main optical system
And the sub-optical system are driven by the drive device
In the device, the transmission member is a sub-optical device when switching the focal length.
System so that relatively displaced against the main optical system, secondary optical
A transmission region for transmitting against a driving force to the system to the secondary optical system, as the time of photographing distance adjustment not subordinate optical system is relatively displaced against the main optical system, the transmission of the driving force to the secondary optical system And a non-driving transmission region for disconnecting. That is, since the focal length switching area and the shooting distance adjustment area are provided on the same member, it is possible to provide a camera capable of adjusting the shooting distance and switching the focal distance with a simple configuration.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a plan view of one embodiment of the present invention.

FIG. 3 is a plan view of an embodiment of the present invention.

FIG. 4 is a perspective view of a displacement mechanism of the first optical system of the embodiment.

FIG. 5 is a front view showing the insertion / removal mechanism of the second optical system of the embodiment.

FIG. 6 is a cross-sectional view showing an inserting / removing mechanism of a second optical system of an example.

FIG. 7 is a cross-sectional view showing an inserting / removing mechanism of a second optical system of an example.

FIG. 8 is a cross-sectional view showing an insertion / removal mechanism of a second optical system of an example.

FIG. 9 is a cross-sectional view showing an inserting / removing mechanism of the second optical system of the example.

FIG. 10 is a cam diagram of an example.

FIG. 11 is a motor control circuit diagram for driving an optical system according to an embodiment.

FIG. 12 is a logic circuit diagram for controlling the operation of the optical system driving motor control circuit of the embodiment.

[Explanation of symbols]

12 ...
Electric drive source 4
... Driven members 12a, 13, 25, 26, 26a, 27, 10i, 3
0 ... Transmission mechanism 26a ...
・ ・ ・ ・ ・ Output member 27 ・ ・ ・ ・ ・ ・ ・ ・ ・
・ ・ ・ Input member 10i ・ ・ ・ ・ ・ ・ ・ ・
・ ・ ・ Supporting member 30
... Biasing member

Claims (1)

(57) [Claims] 1. A drive device for generating a driving force, and the drive device
Main optical system that displaces by transmitting the driving force generated from the table
When the secondary optical system, the driving force emitted from said drive device, the transmission of sub-optical system for transmitting the to the secondary optical system relative movement driving force for displaced relative to the main optical system and a member, said transmission member includes a transmission region for transmitting for said relative movement driving force during the focal length is switched to the secondary optical system, the transmission of the relative displacement driving force at the time of photographing distance adjustment to the secondary optical system A drive device for a camera, comprising: