JPH0658490B2 - Optical system switchable camera - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention includes a main optical system and a sub optical system, and a mode in which only the main optical system is used for shooting and a combined optical system in which both optical systems are combined is used for shooting. The present invention relates to an optical system switchable camera having modes.

(Background of the Invention) Conventionally, in this type of camera, a manual operation force is applied to a driving force for displacing a sub optical system between a position where the sub optical system is inserted in the optical path of the main optical system and a position where the sub optical system is retracted from the optical path. Therefore, the operation was complicated.

(Object of the Invention) It is an object of the present invention to provide an optical system switching type camera having a simple structure, which electrically carries out the mounting / dismounting operation of the sub optical system and the focus adjusting operation of the optical system.

(Summary of the Invention) In order to achieve this object, an optical system switching type camera of the present invention comprises a main optical system driving means for displacing a main optical system in an optical axis direction,
A sub optical system driving means for displacing the sub optical system between a position inserted in the optical path of the main optical system and a position retracted from the optical path,
One motor for driving both drive means, a motor control circuit for rotating the motor for focal length switching and focus adjustment, and both motors when the motor rotates for focal length switching. A driving force transmitting means configured such that when the driving means operate together and rotate for focus adjustment, the main optical system driving means operates but the sub optical system driving means does not operate. It is what

(Examples) Examples 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 dust cover 2 is provided on the front surface of the camera body 1 so as to be displaceable in the left-right direction in the drawing and the main optical system 3 is displaceable in the optical axis direction (vertical direction in the drawing), that is, can be extended and retracted. ing. A direction in which the sub optical system 4 traverses the optical axis of the main optical system 3 inside the camera body 1 between the optical path of the main optical system 3, that is, the position inserted into the photographing light beam and the position retracted from the light beam (in the figure). It is provided so that it can be displaced in the left-right direction. 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 dust cover 2 is in the open position. The focal length selection member 5 is located at the telephoto position where the focal length of the main optical system 3 is in the telephoto region, and faces the letter “T” attached to the upper surface of the camera body 1. The main optical system 3 is located at a projecting position protruding from the front surface of the dustproof cover 2 and constitutes a synthetic optical system together with the sub optical system 4 located at the insertion position and has a focal length 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 sets the focal length of the main optical system 3 to a wide-angle region, and faces the letter “W” attached to the upper surface of the camera body 1. At this time, the main optical system 3 is at the retracted position where it is retracted into the camera body 1 from the retracted position, and the sub optical system 4 is at the retracted position. The main optical system 3 has a wide-angle focal length.

In FIG. 3, the dustproof cover 2 is in the closed position and covers the main optical system 3. At this time, the main optical system 3 is in the retracted position even though the focal length selection member 5 is in the telephoto position, and the sub 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 Sw1 having a sliding contact piece fixed to the dustproof cover 2 and a switch Sw2 having a sliding contact piece fixed to the focal length selecting member 5 are shown in a part of the camera body of FIG. ing.

Switch Sw1 is ON when dust cover 2 is in the open position
When the displacement from the open position toward the closed position is turned off. The switch Sw1 controls the rotation direction of a motor 12 to be described later that displaces the main optical system 3 and also controls power supply to a shutter control circuit 31 to be described later.

The switch Sw2 is switched according to the position of the focal length selection member 5 to displace the main optical system 3, which will be described later.
Control the direction of rotation. The switch Sw2 is turned on when the focal length selection member 5 is in the telephoto position and is turned off when it is in the wide-angle position.

FIG. 4 is a perspective view showing the main optical system displacement mechanism of the present embodiment.

This figure shows a state in which the main optical system 3 is at the extended position. An opening 1 through which a photographing light flux passes in the central portion of the base plate 10.
0a is provided, and the diaphragm / shutter device 11 and the main optical system 3 indicated by the alternate long and short dash line are fixedly provided in front of it. A motor 12 is fixedly installed on the upper back surface of the base plate 10. Both ends of the rotary shaft penetrate through both end surfaces of the casing of the motor 12 and project therefrom. A bevel gear 12a (illustrated in FIG. 5) is fixedly installed at one end of the rotary shaft. A bevel gear 13 axially supported by the base plate 10 meshes with the bevel gear 12a, and a spur gear portion of the gear 13 also meshes with a gear 14 also axially supported by the base plate.
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. Output gear 1 of gear train 17
A through hole is formed in the center of 7b, and a female screw having the rotation center of the gear 17b as an axis is cut in this 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,
The end is fixed to the substrate 1a of the camera body, and the tip is the base plate 1
It is inserted into the 0 through hole 10c so as to be slidable in the axial direction.
The amount and direction of rotation of the gears 14 and 17b with respect to a certain amount of rotation of the motor are set to be equal, and the conditions of screwing between the gear 14 and the guide shaft 15 and screwing between the gear 17b and the guide shaft 18 are also set. Are set equal. A guide shaft 19 extending in the optical axis direction is also planted in the substrate 1a. Guide shaft 19
Is inserted into the through hole 10e of the projecting portion 10d projecting on the back surface of the base plate 10 and the through hole 10f of the base plate 10 so as to be slidable in the axial direction.

With such a configuration, when the motor 12 rotates, the gear plate 14 and the guide shaft 15 are screwed together, and the gear 17b and the guide shaft 18 are screwed together so that the base plate 10 is kept vertical to the optical axis. Main optical system 3, which is moved parallel to the direction and is fixed to it,
The diaphragm / shutter device 11 is 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. On the surface of this printed circuit board 20, conductor lands 20
a to 20c are provided, and three sliding contact pieces 21 to 23 fixedly mounted on the camera body can be slidably contacted thereto. The sliding contact piece 21 and the conductor land 20a form a switch Sw3, the sliding contact piece 22 and the conductor land 20b form a switch Sw4, and the sliding contact piece 23 and a conductor land 20c.
And constitute the switch Sw5. The switch Sw3 is a switch Sw3 when the main optical system 3 is in the retracted position.
When the switch 4 is in the feeding position, the switch Sw5 is OFF when it is in the middle of the feeding position and the feeding position. The switches Sw3 and Sw4 function as limit switches, and cut off the power supply to the motor 12 when the main optical system 3 is displaced to the retracted position or the retracted position. The switch Sw5 is a switch for preventing shutter release when the main optical system 3 is 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 circuit 31 (shown in FIG. 6).

The film 24 is provided behind the photographing opening formed in the substrate 1a.

FIG. 5 is a perspective view of the auxiliary optical system loading / unloading mechanism arranged on the back surface of the base plate 10.

In the figure, a reduction gear train 25, a cam gear 26, and a drive member 27 are axially supported on the back surface of the base plate 10, and the drive member 27 holds the sub 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 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 main optical system 3 is at the extended position, it is placed at the insertion position (shown by the solid line) in which the sub optical system 4 is inserted in the photographing light beam, and when the main optical system 3 is at the extended position, the sub optical system 3 is placed. 4 is placed at a retracted position (illustrated by a chain double-dashed line) retracted from the photographing light flux.

6 to 9 are sectional views of the auxiliary optical system loading / unloading mechanism. In each drawing, the base plate 10 in front of the opening 10a is shown.
A main optical system 3 and a diaphragm / shutter device 11 are fixedly installed in the optical axis, and a positioning means 28 for the sub optical system 4 is formed behind the opening 10a. The positioning means 28 is composed of an inner cylindrical surface 28a having the optical axis of the main 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 main optical system 3. A holding cylinder 4a for integrally holding the sub optical system 4 can be engaged with the positioning means 28, and the optical axis of the sub optical system 4 is in the extended position at the time of the engagement. It is aligned with the axis, and the sub 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 the optical axis in the end surface 4b of the holding tube 4a. Positioning means 28
The contact surface 28c is contacted with the contact surface 28c. The drive member 27 is axially slidably supported by a fixed shaft 10g planted on the base plate 10 via a bearing 27a.
The drive member 27 is formed with an inner peripheral groove 27b for accommodating the sub optical system 4 in a loosely fitted state. A collar 4d is provided on the entire outer circumference of the holding cylinder 4a of the sub optical system 4, and a coil spring 2 drive is inserted between the inner circumferential groove 27b and the collar 4d. The spring 29 serves to urge the sub optical system 4 brought to the insertion position in the direction of contacting the positioning means 28. 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. A pair of flanges 10h and 10i are fixedly installed on the shaft 10g so as to sandwich the bearing portion 27a of the drive member 27.
A spring 30 is inserted between the drive member 27 and the drive member 27.
The spring 30 connects the sliding portion 27c of the drive member 27 to the cam 26a.
Or press the front end face of the bearing 27a into the collar 10
It works by pressing on i. A drive member 27 is attached to the base plate 10.
Locking members 10j and 10k for locking the free end 27d of the are locked, and the locking member 10j locks the swing of the drive member 27 when the sub optical system 4 is brought to the insertion position, The locking member 10k locks the swing of the driving member 27 when the sub optical system 4 is brought to the retracted position. In addition, a circular hole 101 into which the small cylinder 4c of the sub optical system 4 brought to the retracted position falls in a loosely fitted state is provided near the end of the locking member 10k.

FIG. 6 shows the position where the sub optical system 4 is at the insertion position and is engaged with the positioning means 28 (hereinafter referred to as the complete insertion position).
It shows the state when. FIG. 7 shows a state in which the sub optical system 4 is in the insertion position, but is in 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). In FIG. 8, the sub-optical system 4 is in the retracted position, but the small cylinder 4c has a circular hole 101.
It shows the state when it is in a position where it does not fall into the position (hereinafter referred to as an incomplete retracted position). FIG. 9 shows a state in which the sub optical system 4 is in the retracted position and the small cylinder 4c is in the position where the small cylinder 4c has fallen into the circular hole 101 (hereinafter referred to as the complete retracted position).

FIG. 10 shows a cam diagram of the cam 26a. The cam 26a includes a first flat section A in which the rotation angle Θ is 0 to Θ1 and the head is unchanged at 0, and a first slope section B in which the head h is linearly increased from 0 to h1 from Θ1 to Θ2.
And a second flat section C in which the head h does not change at h1 from Θ2 to Θ3, and a head h is h from Θ3 to 360 °.
The second slope section D linearly decreases from 1 to 0.

The cam 26a acts on the sub optical system 4 as shown in FIG. The first is the action of displacing the sub optical system 4 in the optical axis direction of the main optical system 3 between the completely inserted position and the incompletely inserted position. The second is the action of displacing the sub optical system 4 in a direction crossing the optical axis of the main optical system 3 between the incompletely inserted position and the incompletely retracted position. The third is the action of displacing the sub optical system 4 in the optical axis direction of the main 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 1
2 is driven by three power supply paths.

The first path is a path of the positive electrode of the power source E-the switch Sw3-the switch Sw7a-the motor 12-the switch Sw7b-the negative electrode of the power source E. When power is supplied through this path, the motor 12 rotates to displace the main optical system 3 to the retracted position and the sub optical system 4 to the retracted position.

The second path is the path of the positive electrode of the power source E-the switch Sw4-the switch Sw8a-the motor 12-the switch Sw8b-the negative electrode of the power source E. By supplying power through this path, the motor 12 rotates in the direction opposite to that in the case of the first path to displace the main optical system 3 to the feeding position and the sub optical system 4 to the insertion position.

Here, the switches Sw7a, Sw7b, Sw8a, Sw8.
Reference numeral b is a semiconductor switch whose opening and closing is controlled by a logic circuit 40 (shown in FIG. 12) described later.

The third route is the automatic focus adjustment / shutter control circuit 31.
The control circuit 31
The motor 12 rotates in the forward and reverse directions by the output of, and moves the optical system back and forth in the optical axis direction to bring the focus into agreement.

Switches Sw1a and Sw5 connected in series are inserted in the power supply path of the control circuit 31. Switch Sw1
a is a semiconductor switch which is controlled by the switch Sw1 and is opened and closed in the same phase as the switch Sw1.
Turns on only when is in the open position. The switch Sw5 is used when the main optical system 3 is at the feeding position and the feeding position (the sub optical system 4).
Is at the full insertion position and the full retreat position). These prevent the automatic focus adjustment and the shutter from operating when the dust-proof cover 2 and the optical systems 3 and 4 are in positions unsuitable for photographing.

FIG. 12 shows a logic circuit 40 that controls the operation of the motor control circuit of FIG. The logic circuit 40 includes a pair of input terminals 40a and 40b and a pair of output terminals 40c,
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.
Are connected to the control terminals of the switches Sw8a and 8b, respectively. In the input terminal 40a, the switch Sw1 is O
High when N, that is, when the dust cover 2 is in the open position
When the switch Sw1 is OFF, that is, when the dustproof cover 2 is in the closed position, the level is Low. The input terminal 40b is at high level when the switch Sw2 is ON, that is, when the focal length selection member 5 is in the telephoto position, and is at low level when the switch Sw2 is OFF, that is, when the focal length selection member 5 is in the wide-angle position. Become. When the output terminal 40c is at high level, the switch Sw7a,
Both Sw7b are turned on, and both are turned off when they are at low level. The output terminal 40d turns on both the switches Sw8a and Sw8b when it is at high level, and turns off both when it is at 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 connected to the output terminal 40c of the logic circuit 40 and the input terminal of the inverter 40h, and the output terminal of the inverter 40h is connected to the output terminal 40d of the logic circuit 40.

In the table below, the position of the dustproof cover 2, the position of the focal length selection member 5, and the switch Sw that switches depending on these positions
1, the state of Sw2, the input terminals 40a, 4 of the logic circuit 40
0b, output terminals 40c and 40d level, switch Sw
The relationships among the states of 7a, Sw7b, Sw8a, and Sw8b and the positions of the main optical system 3 and the sub optical system 4 are summarized.

[1] As shown in FIG. 1, the dustproof cover 2 is at the open position,
When the focal length selection member 5 is in the telephoto position and the main optical system 3 is already in the extended position, the switches Sw1 and Sw2 are both in the ON state, so the input terminal 40 of the logic circuit 40 is
Both a and 40b are at 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 terminals 40c and 40d of the logic circuit 40 are respectively
Low and High level. As a result, the switches Sw7a and Sw7b shown in FIG. 6 are turned off and the switch Sw7 is turned off.
8a and Sw8b are turned on. Since the main optical system 3 is at the extended position, the switches Sw3 and Sw are set as shown in FIG.
4 and Sw5 are in ON, OFF, and ON states, respectively. Since the switches Sw7a and Sw7b are OFF, the first path is not formed, and since the switch Sw4 is OFF, the second path is not formed.

In this case, the main optical system 3 is at the feeding position, and the sub optical system 4 is at the sixth position.
As shown in the figure, they are still at the fully inserted position where they are completely engaged with the positioning means 28, and the two optical systems form a synthetic optical system whose focal length is in the telephoto range.
Also, since the switches Sw1a and Sw5 are both ON,
The automatic focus adjustment / shutter control circuit 31 is in an operable state, and it is possible to shoot with the telephoto optical system. Figure 1 shows
The state at this time is shown.

The motor 12 is supplied with electric power through the third path and rotates in accordance with the shooting start operation, and displaces the optical systems 3 and 4 in the optical axis direction from the close-up of the telephoto region to the infinity to perform focus adjustment. 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 fixed to the spring 30.
The sliding contact portion 27c of the drive member 27 faces the first flat section A of the cam 26a, but does not make contact with the flange 10i. Therefore, the sliding contact portion 27c
Does not become a load on the motor 12.

[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 High.
Since it becomes the level, the output terminal of the OR circuit 40g is inverted to the High level, and the output terminals 40c and 40d of the logic circuit 40.
Are inverted to High and Low levels, respectively. As a result, the switches Sw7a and Sw7b shown in FIG. 6 are turned on,
The switches Sw8a and Sw8b are turned off. Since the main optical system 3 is at the extended position, the switches Sw3, Sw4, and Sw5 are turned on, off, and O, respectively, as shown in FIG.
In the state of N and the switches Sw7a and Sw7b are ON, the first path is formed and the motor 12 is started. Therefore, the main optical system 3 starts to be displaced from the feeding position toward the feeding position.

The sub-optical system 4 is displaced in the optical axis direction from the complete insertion position (shown in FIG. 6) that engages with the positioning means 28 by the initial rotation of the motor 12, and the incomplete insertion position (that does not engage with this). (Shown in FIG. 7). This optical axis displacement is
This is because the cam 26a rotates clockwise from the state shown in FIG. 5 and pushes up the sliding contact portion 27c of the drive member 27 in the first slope section B. When the sub optical system 4 reaches the incompletely inserted position and disengages from the positioning means 28, the drive member 27 can swing in a direction traversing the optical axis. 27c is pushed by the first slope section B and swings clockwise in a plane crossing the optical axis of the main optical system 3. At this time, the end surface of the small cylinder 4c of the sub optical system 4 slides on the back surface of the base plate 10 and swings in the same direction. When the main optical system 3 approaches the retracted position, the free end 27d of the drive member 27 comes into contact with the locking member 10k and its swing is prevented, and the sub optical system 4 is not inserted into the circular hole 101. To reach. Since the motor 12 continues to rotate after that, the sliding contact portion 27c of the drive member 27 has the first slope section B of the cam 26a.
To reach the second flat section C (shown in FIG. 8). Subsequently, the sliding contact portion 27c slides down the second slope section D, and the front end surface of the bearing portion 27a is in the middle of the sliding contact section 27c.
Since the sliding contact portion 27c separates from the cam 26a and faces the first flat section A, the sliding contact portion 27c 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 sub optical system 4 is inserted into the circular hole 101 of the base plate 10, and the end surface 4b of the holding cylinder 4a abuts on the edge of the circular hole 101 to reach the complete retracted position (shown in FIG. 9). At this time, the main optical system 3 has reached the retracted position.

In addition, after the drive member 27 stops the displacement in the optical axis direction by the front end surface of the bearing portion 27a contacting the collar 10i,
The biasing force for inserting the sub optical system 4 into the circular hole 101 is the spring 2
9 supplies.

When the main optical system 3 reaches the retracted position, the switches Sw3, Sw4, Sw5 shown in FIG.
N, ON state. When the switch Sw3 is turned off, the first path is cut off and the power supply to the motor 12 is stopped. Therefore, the main optical system 3 is at the retracted position, and the sub optical system 4 is
Are stationary at the completely retracted positions, the optical system is composed of only the main optical system 3, and its focal length is in a wide-angle region. Further, since the switches Sw1a and Sw5 are both ON, the automatic focus adjustment / shutter control circuit 31 is in an operable state, and the wide-angle optical system can perform photographing. FIG. 2 shows the state at this time.

The motor 12 receives power from the third path and rotates in response to the shooting start operation, and displaces the optical system 3 in the optical axis direction between the close-up of the wide-angle region and the infinity to perform focus adjustment. During rotation of the motor 12 for focus adjustment in this wide-angle range,
Since the sliding contact portion 27c of the driving member 27 only faces the first flat section A and does not make contact therewith, the driving member 27 does not move, and the sub optical system 4 remains in the completely retracted position.

[3] When the dust cover 2 is displaced from the open position to the closed position in 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 output terminal of the exclusive OR circuit 40e becomes Hi.
gh level. The subsequent operation is the same as in [2]. Even though the focal length selection member 5 is at the telephoto position, the main optical system 3 is displaced from the extended position toward the retracted position, and the sub optical system 4 is moved.
Is displaced from the fully inserted position to the fully retracted position. When the main optical system 3 is displaced to the retracted position, the dustproof cover 2 can be displaced to the closed position. When the dust cover 2 reaches the closed position, the switch Sw having the same phase as the switch Sw1
Since 1a is turned off, power supply to the automatic focus adjustment / shutter control circuit 31 is cut off, and photographing is 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 31 is cut off, and photographing is impossible.

[5] When the focal length selection member 5 is switched from the state shown in FIG. 2 to the telephoto position, the switch Sw2 is turned on and both the input terminals 40a and 40b of the logic circuit 40 are High.
It becomes a 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 High, respectively.
Invert to level. As a result, the switch S shown in FIG.
w7a and Sw7b are turned off, and the switch Sw8a,
Sw8b is turned on. Since the main optical system 3 is in the retracted position, the switches Sw3, Sw4, and Sw5 are OF, respectively.
F, ON, ON. Switches Sw8a, Sw
Since 8b is ON and the switch Sw4 is ON, the second path is formed, and the motor 12 starts rotating in the direction opposite to that at the time of [2]. Therefore, the main optical system 3 starts to be displaced from the feeding position toward the feeding position.

By the initial rotation of the motor 12, the sub optical system 4 is displaced in the optical axis direction from the completely retracted position (shown in FIG. 9) and the circular hole 1 is moved.
It disengages from 01 and is displaced to the incomplete retracted position (shown in FIG. 8). The displacement in the optical axis direction is due to the cam 26a rotating and pushing up the sliding contact portion 27c of the drive member 27 in the second slope section D. When the sub optical system 4 comes out of the circular hole 101, the drive member 27 can swing in the direction crossing the optical axis of the main optical system 3. As the motor 12 continues to rotate, the sliding contact portion 27c is pushed in the direction crossing the optical axis by the second slope section D, so that the drive portion 27 swings in the same direction and the small cylinder 4c of the sub optical system 4 moves. The end surface moves from the incomplete retracted position (shown in FIG. 8) to the incompletely inserted position (shown in FIG. 7) while sliding on the back surface of the base plate 10. When the main optical system 3 approaches the extended position, the free end 27d of the drive member 27 is locked by the locking member 10.
The secondary optical system 4 stops at the incompletely inserted position by coming into contact with j and being prevented from swinging. Since the motor 12 continues to rotate after that, the sliding contact portion 27c of the drive member 27 is connected to the cam 26a.
Ascends the second slope section D to reach 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 brim 10i in the middle thereof, so that the sliding contact portion 27c moves to the cam 2
6a is separated from the first flat section A, and the first flat section A is not contacted. 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 sub optical system 4 comes into contact with the guide surface 28b of the positioning means 28, and then is guided by the guide surface 28b and the inner cylindrical surface 28a. The end surface 4b of the holding cylinder 4a contacts the contact surface 28c of the positioning means 28, reaches the complete insertion position shown in FIG. 6, and the positioning of the sub optical system 4 is completed. At this time, the main optical system 3 has reached the delivery position.

Note that after the drive member 27 stops the displacement in the optical axis direction due to the bearing portion 27a contacting the flange 10i, the sub optical system 4
A spring 29 supplies the biasing force that engages the positioning means 28.

When the main optical system 3 reaches the extended position, the switches Sw3, Sw4, Sw5 are turned off as described in [1].
N, OFF, ON state. Switch Sw4 is OF
When reaching F, the second path is cut off, and the power supply to the motor 12 is stopped. Therefore, as shown in FIG. 1, the main optical system 3 is stationary at the extended position and the sub 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. 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.

[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, and the input terminals 40a and 40b of the logic circuit 40 are both High.
It becomes a level. The following is the same operation as described in [5].

Each of the members 10, 13 to 19 of this embodiment functions as a main optical system driving means for displacing the main optical system 3 in the optical axis direction thereof, and each member of 10, 13, 25 to 30 is a sub optical system. It functions as a sub optical system driving means for displacing 4 between the position inserted in the optical path of the main optical system 3 and the position retracted from the optical path. Sw1, Sw1a, Sw2, Sw3 to Sw5, 3
Each of the members 1, 40, Sw7a, Sw7b, Sw8a, Sw8b functions as a motor control circuit for rotating the motor 12 for focal length switching and focus adjustment. The cam 26a works as a driving force transmitting means for controlling the interlocking relationship between the above-mentioned both driving means and the motor 12 as follows. That is, when the motor 12 rotates for switching the focal length, both drive means operate together, the main optical system 3 is displaced in the optical axis direction between the feeding position and the feeding position, and the sub optical system 4 is moved. Is displaced between the insertion position and the retracted position, and when the motor 12 is rotated for focus adjustment, the main optical system driving means operates to displace the main optical system 3 in the optical axis direction and focus. Although the adjusting operation is performed, the sub-optical system driving means does not operate, so the sub-optical system 4 remains at the insertion position or the retracted position.

In the above embodiment, the sub optical system driving means swings the sub optical system between the insertion position and the retracted position around an axis parallel to the optical axis of the main optical system, but the present invention is not limited to this. However, for example, it may be linearly displaced in a plane orthogonal to the optical axis,
Further, it may be swung about an axis orthogonal to the optical axis.

(Effects of the Invention) According to the present invention, the operation required for focus adjustment and the operation for mounting / removing the sub-optical system are performed by one motor, so that the structure is simple and both operations do not interfere with each other. Since it is set, the sub-optical system does not cause an attachment / detachment operation during the focus adjustment operation to adversely affect the shooting screen.

[Brief description of drawings]

1 to 3 are plan views of an embodiment of the present invention, FIG. 4 is a perspective view of a displacement mechanism of a main optical system of the same embodiment, and FIG. 5 is a mounting / demounting of a sub optical system of the same embodiment. A perspective view showing the mechanism, FIGS. 6 to 9 are sectional views of FIG. 5, FIG. 10 is a cam diagram, and FIG.
The figure shows a control circuit diagram of a motor for driving an optical system of the same embodiment,
The figure is a logic circuit diagram for controlling the operation of the motor control circuit. [Description of symbols of main parts] 3 ... Main optical system 10, 13 to 19 ... Main optical system driving means 4 ... Sub optical system 10, 13, 25 to 30 ... Sub optical system driving means 12 ... Motor Sw1, Sw1a, Sw2, Sw3 to Sw5, 31, 4,
0, Sw7a, Sw7b, Sw8a, Sw8b ... Motor control circuit 26a ... Driving force transmission means

Claims (1)

[Claims] 1. A main optical system, a main optical system driving means for displacing the main optical system in an optical axis direction, a sub optical system, and a position where the sub optical system is inserted in an optical path of the main optical system. Sub-optical system drive means for displacing between the position retracted from the optical path, one motor for driving both drive means, and motor for rotating the motor for focal length switching and focus adjustment. When the control circuit and the motor rotate for switching the focal length, both drive means operate together, and when the motor rotates for focus adjustment, the main optical system drive means operates but the sub-optical system operates. An optical system switchable camera, characterized in that the system drive means has a drive force transmission means configured so as not to operate.