JPH073540B2 - Optical system moving device - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to an optical system moving device in an optical device in which an optical device main body supports an optical system so as to be movable in an optical axis direction.

[Background of the Invention] In a camera in which an optical system moves, it is necessary to interlock other mechanisms that follow the movement of the optical system. For example, a focal length switching type camera may be provided with many interlocking mechanisms such as an automatic focus adjustment mechanism, a finder magnification switching mechanism, a distance pointer switching mechanism, a parallax correction mechanism, and a position detection mechanism of an optical system. Needs to be moved to change the focal length, and the mechanism that works accordingly must be driven accurately.

Under such a premise, when driving the optical system and the driven mechanism by power, in order to appropriately move the optical system, it is necessary to sufficiently decelerate the driving source that operates at high speed and transmit it to the optical system. Yes, the same applies to the driven interlocking mechanism.

If the drive source is a motor, the motor is typically 10,000 rpm
Although the optical system often does not make one revolution while rotating at ~ 15000 rpm, when attempting this deceleration with the gear train,
It becomes an extremely complicated mechanism, requires a large space, and if the interlocking mechanism is driven by the above motor,
It becomes almost impossible in terms of structure and space. Further, it is difficult to synchronize the optical system and the mechanism by appropriately preparing a plurality of drive sources, and it is impossible in terms of space and cost to make the mechanism to ensure the synchronization.

[Object of the Invention] The present invention has an object to provide an optical system moving device in which an optical system is appropriately driven by a common drive source and an interlocking mechanism is driven.

[Summary of the Invention] The gist of the present invention for achieving such an object is to provide an optical system moving device in an optical device in which an optical system is supported in an optical device body so as to be movable in an optical axis direction, An optical system moving device is configured by at least two male screw shafts provided in the optical device main body and female screw members provided on the optical system side that are respectively screwed with the male screw shafts, and each female screw member forms an optical system. The optical axis direction and the axial direction are the same, and the optical axis direction is immovable and pivotally attached to a supporting member that holds the optical system and moves in the optical axis direction together with the optical system. Is installed in parallel with the optical axis by screwing into, and a drive source for rotationally driving one of the female screw member and the male screw shaft is provided among the pair of the female screw member and the male screw shaft, and the optical system supporting member is provided. Followed interlocking mechanism An optical system moving device is provided, wherein the interlocking mechanism is operated in synchronization with the optical system.

Then, the male screw shaft and the female screw member screwed together are
When one of them is driven by power, the speed is greatly reduced and the other is relatively driven straight forward, the optical system holding the female screw member moves in the optical axis direction, and the operation of the decelerated optical system is taken out and interlocked. The mechanism is driven.

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

As shown in FIG. 1 and FIG. 2, a focal length selection member 2 is provided on the rear surface of the camera body 1, and inside the camera body 1, a switch SW1 interlocked with a dust cover (not shown) and a focal length selection member. Switch SW2 interlocking with member 2
And are provided.

On the front side of the camera body 1, a main optical system 3 is provided so as to be displaceable in the optical axis direction (left and right direction in the drawing), that is, retractable and retractable. Inside the camera body 1, the sub-optical system 4 crosses the optical axis of the main optical system 3 between the position inserted into the light beam of the main optical system 3, that is, the photographing light beam and the position retracted from the light beam (first It is provided so that it can be displaced in the vertical direction in FIG.

A plurality of finder optical systems including a first finder optical system 5 and a second finder optical system 6 are provided above the camera body 1 by being housed in the finder housing portion 1a. This viewfinder optical system is shown in Japanese Patent Application No. 59-22566,
As shown in FIG. 4, it is an inverse Galileo finder capable of magnification conversion by the front group 5a and the rear group 5b.

The switch SW1 is set to be turned off when the dustproof cover covers the main optical system 3 and turned on when listening to the front surface of the main optical system 3. The switch SW2 is turned on when the focal length selection member 2 is in the telephoto position.
And is set to OFF when in the wide-angle position.

FIG. 3 is a perspective view showing the main optical system displacement mechanism and the finder system switching mechanism of this embodiment.

This figure shows a state in which the main optical system 3 is at the extended position. An opening 10a through which a photographing light flux passes is formed in the central portion of the base plate 10.
Is provided in front of which a diaphragm / shutter device 11 and a main optical system 3 shown by a chain line are fixedly installed.
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 faces of the casing of the motor 12 and project therefrom. A bevel gear 12a (illustrated in FIG. 4) is fixedly mounted on one end of the rotary shaft. A bevel gear 13 axially supported by the base plate 10 is engaged with the bevel gear 12a, and a spur tooth portion of the gear 13 is engaged 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 onto the female screw. The guide shaft 15 extends in the optical axis direction, the end is fixed to the substrate 1c of the camera body 1, and the tip is 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. This bevel gear 12b has a base plate 10
The bevel gear 16 pivotally supported by the gear meshes with each other, and the spur gear of the gear 16 is engaged with the input gear 17 of the gear train 17 pivotally supported by the base plate 10.
a is engaged. A through hole is formed in the center of the output gear 17b of the gear train 17, and a female screw whose axis is the rotation center of the gear 17b is cut 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, the end is fixed to the substrate 1c of the camera body, and the tip is inserted into the through hole 10c of the base plate 10 so as to be slidable in the axial direction. The amount and direction of rotation of the gears 14 and 17b relative to a certain amount of rotation of the motor are set to be equal, and the conditions for screwing the gear 14 and the guide shaft 15 and screwing the gear 17b and the guide shaft 18 are also set. Are set equal. Board 1c
A guide shaft 19 extending in the optical axis direction is also planted in the optical axis. The guide shaft 19 is provided with a through hole 1 of the projecting portion 10d provided on the back surface of the base plate 10.
It is inserted into 0e and the through hole 10f of the base plate 10 so as to be slidable in the axial direction.

That is, a guide shaft 15 that is a male screw shaft is attached to a base plate 10 that is a supporting member that supports an optical system configured by the main optical system 3 and the sub optical system 4.
And the guide shaft 18 are installed parallel to the optical axis of the optical system,
A gear 14 and a gear 17b, which are female screw members, are pivotally attached to the guide shaft 15 and the guide shaft 18 so that the optical axis direction and the axial direction are the same, and the axial direction is immovable, and the gears 14 and 17b serve as a driving source. The motor 12 is driven to rotate, and the high rotation of the motor 12 is converted into the linear motion of the guide shafts 15 and 18 with a large reduction ratio.

With this structure, when the motor 12 rotates, the gear 14
The base plate 10 is translated in the optical axis direction while keeping vertical to the optical axis by the screwing of the guide shaft 15 and the screwing of the gear 17b and the guide shaft 18, and the main optical system 3 fixed to the base plate 10 is fixed. 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.
Conductor lands 20a to 20c are provided on the surface of this printed circuit board 20, and these are fixed to the camera body.
The two sliding contact pieces 21 to 23 are each slidable.
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 the conductor land 20c form a switch SW5. The switch SW3 is OFF when the main optical system 3 is at the feeding position, the switch SW4 is at the feeding position, and the switch SW5 is OFF when it is between the feeding position and the feeding position. Switches SW3 and SW4 work as limit switches, and the main optical system 3
When the motor is displaced to the feeding position or the feeding position, the motor 12
Cut off the power supply. The switch SW5 is a switch for disabling shutter release when the main 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. Circuit 31
It is a switch for cutting off the power supply to (illustrated in FIG. 8).

The film 24 is arranged behind the photographing opening 1d opened in the substrate 1c.

FIG. 4 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. Input gear of reduction gear train 25
25a meshes with the spur gear portion of the bevel gear 13, and the final gear 25b of the reduction gear train 25 meshes with the cam gear 26. The cam gear 26 and the drive member 27 are coaxial,
The two are coupled 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 in the extended position, the sub optical system 4
Is placed at the insertion position (shown by the solid line) inserted in the photographing light beam, and when the main optical system 3 is at the retracted position, the retracted position where the sub optical system 4 is retracted from the photographing light beam (shown by the chain double-dashed line) It is designed to be placed in.

FIG. 5 shows a sectional view of the auxiliary optical system mounting / demounting mechanism.

In the figure, the main optical system 3 is attached to the base plate 10 in front of the opening 10a.
A diaphragm / shutter device 11 is fixedly provided, 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 skirt, and a contact surface 28c orthogonal to the optical axis of the main optical system 3. A holding tube 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 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 in the optical axis direction is performed by the end surface 4b of the holding tube 4a. This is done by contacting the contact surface 28c of the positioning means 28.

The drive member 27 is axially slidably supported by a fixed shaft 10g planted in the base plate 10 via a bearing portion 27a so as to be slidable in the axial direction. The drive member 27 has a circumferential groove 27 in which the sub optical system 4 is loosely fitted.
b is formed.

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 29 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 axially 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. Collars 10h and 10i are fixedly mounted on the shaft 10g so as to sandwich the bearing portion 27a, and a spring 30 is inserted between the collar 10h and the drive member 27. The spring 30 presses the sliding contact portion 27c of the drive member 27 against the cam 26a, or the front end surface of the bearing portion 27a is provided with a collar 10.
It works by pressing on i. Locking members 10j, 10k for locking the free end 27d of the driving member 27 are implanted in the base plate 10,
The locking member 10j locks the swing of the driving member 27 when the sub optical system 4 is brought to the insertion position, and the locking member 10k is the driving member 27 when the sub optical system 4 is brought to the retracted position. Lock the swing of. Further, near the end of the locking member 10k, there is provided a circular hole 10l into which the small cylinder 4c of the sub optical system 4 brought to the retracted position falls in a loosely fitted state.

FIG. 5 shows a state in which the sub optical system 4 is in the insertion position and in the complete insertion position in which the sub-optical system 4 is engaged with the positioning means 28. The sub optical system 4 also takes the following positions. That is, although it is in the insertion position, it is pushed up by the front cam 26a and does not engage with the positioning means 28, that is, the incomplete insertion position, which is on the circular hole 10l, but its small cylinder 4c is pushed up by the front cam 26a. Incomplete retracted position that has not fallen into the circular hole 10l,
The small cylinder 4c is in the completely retracted position where it has fallen into the circular hole 10l.

FIG. 6 shows a cam diagram of the cam 26a. Cam 28a
Is the first flat section A where the rotation angle Θ is 0 to Θ1 and the head does not change at 0, and the head h is 0 from Θ1 to Θ2.
From the first slope section B that increases linearly from 1 to h1 and the second flat section C where the head h does not change at h1 from Θ2 to Θ3
And a second slope section D in which the head h decreases linearly from h1 to 0 from Θ3 to 360 °.

The cam 26a has three functions with respect to the sub optical system 4. 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. 3 shows a viewfinder switching mechanism. First
The finder optical system 5 is at the insertion position.

As shown in the figure, a rack 51 is erected on the back surface of the base plate 10, and the rack 51 is mounted on a guide shaft 51a in which the base end is planted in the base plate 1c and the front part is loosely fitted to the base plate 10. You are being guided.

The rack teeth 51b engraved on the rack 51 are meshed with a pinion 52a fixed to the lower end of the transmission shaft 52, so that the transmission shaft 52
Penetrates a partition plate that shields the taking optical system and the viewfinder optical system from light.

The finder switching device forms an interlocking mechanism that follows the base plate 10, and takes out a movement in synchronization with the optical system by combining the rack 51 and the pinion 52a. The spur gear 52b fixed to the upper end of the transmission shaft 52 meshes with the reduction gear 53a fixed to the cam plate 53.

A cam groove 54 is formed on the upper surface of the cam plate 53, and an actuating tooth 53b, a drive tooth 53c continuous from the actuating tooth 53b with one tooth missing, and a sliding contact edge 53d are formed on the peripheral edge.

The switching drive member 55 is disposed near the cam plate 53 and the swing shaft 55a
It is provided so as to be pivotally supported in the finder storage section 1a via the. The switching drive member 55 is a fan-shaped portion having a start tooth 53b of the cam plate 53, a start tooth 55b corresponding to the drive tooth 53c, and a drive tooth 55c.
55d and a first radial direction formed around the swing shaft 55a.
The cam portion 55g includes a cam surface 55e and a second cam surface 55f, which is a circumferential surface, and a swing arm 55h radially extended from the swing shaft 55a.

Then, the first objective lens 56 is fixed to the tip of the support arm 55i extended upward from the tip of the swing arm 55h,
The first objective lens 56 constitutes a first finder optical system. The switching drive member 55 is urged clockwise by a spring 55j stretched between the switching drive member 55 and a pin projecting from the finder housing 1a as viewed from above in FIG.

The second objective lens 57 forming the second finder optical system is swingably supported by the rectilinear frame 58 via the pivot shaft 57a, and the rectilinear frame 5
Reference numeral 8 is supported in the finder housing 1a so as to be able to move straight in the optical axis direction of the finder optical path. Second objective lens 57
A spring 58b is stretched between the locking pin 57b protruding downward from the locking pin 58a and the locking pin 58a protruding downward from the rectilinear frame 58, and the second objective lens 57 is seen from above in FIG. The locking pin 57b is urged in the clockwise direction by abutting against the lower side 58c of the rectilinear frame 58 and is held facing the front. Further, the second objective lens 57
An engaging rod 57c projectingly provided on the lower end surface of the switch extends downward, and its tip engages with the cam portion 55g of the switching drive member 55.
The rack 51, transmission shaft 52, cam plate 53, switching drive member 5
5, the engaging rod 57c and the like constitute second finder optical system switching means.

On the other hand, the rack 51, the transmission shaft 52, the cam plate 53, the switching drive member 55 and the like constitute the first finder optical system drive means.

A driven pin 59a protruding from the swing lever 59 is engaged with the cam groove 54 of the cam plate 53. The oscillating lever 59 has its base end pivotally supported by the finder housing 1a via a pivot 59b.
A turnover spring 59d for holding the swing lever 59 in the telephoto position and the wide-angle position is stretched between a pin 59c protruding further from the pivot 59b and a pin 1b fixedly mounted in the finder housing 1a. ing. The cam groove 54 of the cam plate 53 includes a first circumferential groove 54a that does not move the driven pin 59a, a drive groove 54b that moves the driven pin 59a and rocks the rocking lever 59, and a first groove that does not move the driven pin 59a. It is constituted by two circumferential grooves 54c.

A substantially U-shaped split groove 59e is formed at the tip of the swing lever 59, and the split groove 59e is provided with a vertical motion extending downward from a linear motion connecting arm 58d protruding rearward from the rectilinear frame 58. Rod 58e
Is engaged with the tip of the.

FIG. 8 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 circuits.

The first path is the positive pole of the power supply E-the switch SW3-the switch S.
W7a-motor 12-switch SW7b-negative electrode path of the power supply E. By supplying power 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 positive pole of the power source E-the switch SW4-the switch S.
W8a-motor 12-switch SW8b-negative electrode path of the power supply E. By supplying power through this path, the motor 12
Rotates in the direction opposite to that 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, and SW8b are semiconductor switches whose opening / closing is controlled by a logic circuit 40 (shown in FIG. 9) 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 reverse direction to move the optical system back and forth in the optical axis direction. Focus on.

The power supply path of this control circuit 31 has switches connected in series.
SW1a and SW5 are inserted. The switch SW1a is a semiconductor switch controlled by the switch SW1 and opened / closed in the same phase as the switch SW1. The switch SW1a is turned on only when a dust cover (not shown) is in the open position. The switch SW5 is turned on only when the main optical system 3 is in the extended position and the retracted position (when the sub optical system 4 is in the completely inserted position and the completely retracted position). These prevent the automatic focus adjustment and the shutter from operating when the dust-proof cover and the optical systems 3 and 4 are in positions unsuitable for shooting.

FIG. 9 shows a logic circuit 40 which 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 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, and the output terminal
40c is the control terminal of the above switches SW7a and SW7b, and the output terminal 40c
d is connected to the control terminals of the switches SW8a and SW8b, respectively. The input terminal 40a becomes High level when the switch SW1 is ON, that is, when the dust cover is in the open position,
Low level when switch SW1 is OFF, that is, when the dustproof cover is in the closed position. Input terminal 40b is switch W2
Is ON, that is, when the focal length selection member 2 is in the telephoto position, the level is High, and when switch SW2 is OFF, that is, the focal length selection member 2 is in the wide-angle position, the level is Low. When the output terminal 40c is at the high level, both the switches SW7a and SW7b are turned on, and when the output terminal 40c is at the low level, both are turned off. Output terminal 40d is switch SW8a,
Turn on both SW8b and turn off both 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.

The following table shows the positions of the dustproof cover, the position of the focal length selection member 2, and switches SW1 and SW that switch depending on these positions.
2 state, input terminals 40a, 40b, output terminals 40c, 4 of logic circuit 40
The relationship among the level of 0d, the states of the switches SW7a, SW7b, SW8a, and SW8b, and the positions of the main optical system 3 and the sub optical system 4 is summarized.

(1) As shown in FIG. 1, when the dustproof cover is in the open position, the focal length selection member 2 is in the telephoto position, and the main optical system 3 is already in the extended position, both switches SW1 and SW2 are turned on. Since the input terminals 40a and 40b of the logic circuit 40 are both Hig
It becomes the h level. The output terminals of the exclusive-sive OR circuit 40e and the NOR circuit 40f are at low level, and the output terminal of the OR circuit 40g is also at low level. Output terminals 40c, 4 of logic circuit 40
0d is Low and High level, respectively. As a result, the switches SW7a, SW7b shown in FIG. 8 are turned off, and the switches SW8a, S7
W8b turns ON. Since the main optical system 3 is in the extended position, the switches SW3, SW4 and SW5 are turned on and off as shown in FIG.
It is in the OFF, ON state. 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 fifth position.
As shown in the figure, they are stationary at the fully inserted position where they are completely engaged with the positioning means 28, and both optical systems form a synthetic optical system, and the focal length thereof is in the telephoto range. Since the switches SW1a and SW5 are both ON, the automatic focus adjustment / shutter control circuit 31 is in an operable state, and shooting with the telephoto optical system is possible. FIG. 1 shows the state at this time.

The motor 12 is rotated by receiving power from the third path in response to 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 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 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
Faces only the first flat section A of the cam 26a and does not make contact therewith. Therefore, the sliding contact portion 27c does not become a load on the motor 12.

The finder optical system is also in the telephoto state as shown in FIGS. 10 and 14 (A) with the first objective lens 56 positioned in front of the second objective lens 57.

Since the gears 14 and 17b are rotationally driven by the rotation of the motor 12, the gears 14 and 17b move relatively to the guide shafts 15 and 18, and the main optical system 3 and the sub optical system are used for focus adjustment for telephoto shooting. The base plate 10 of the system 4 is displaced back and forth. Thereby the cam plate
When 53 is rotated, the vertical movement rod 58e of the rectilinear frame 58 is connected to one inner wall of the split groove 59e of the rocking lever 59 and the finder housing 1a.
The starter tooth 53b of the cam plate 53 and the starter tooth 55b of the switching drive member 55 are separated from each other by being sandwiched between the rear end of the guide groove 1f provided in the. 53
Moving within the range of the first circumferential groove 54a of the cam groove 54 of
Since the vertical movement pin 59a is prevented from coming into contact with the side wall of the first circumferential groove 54a, the finder optical system does not operate to switch or vibrate.

(2) When the focal length selection member 2 is switched to the wide-angle position from the state shown in FIG. 1, the switch SW2 is turned off,
The input terminal 40b of the logic circuit 40 becomes Low level. Since the output terminal of the exclusive OR circuit 40e is at the High 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 the High and Low levels, respectively. This allows the switches SW7a and SW7 shown in FIG.
b turns on and switches SW8a, SW8b, turn off. Since the main optical system 3 is in the extended position, the switches SW3, SW4, and SW5 are in the ON, OFF, and ON states, respectively, as shown in FIG. 3, and the switches SW7a and SW7b are in the ON states. Since the path is formed, the motor 12 is started, and the gears 14 and 17b are rotationally driven, the gears 14 and 17b move relative to the guide shafts 15 and 18, and the main optical system 3 moves from the extended position. It begins to displace toward the retracted position.

The sub-optical system 4 is displaced in the optical axis direction from the complete insertion position (shown in FIG. 5) in which the positioning means 28 is engaged by the initial rotation of the motor 12 to the incomplete insertion position in which it is not engaged. Displace. The displacement in the optical axis direction is due to the cam 26a rotating clockwise from the state shown in FIG. 3 and pushing 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 is disengaged from the positioning means 28, the drive member 27 can swing in the direction traversing the optical axis. 27
The c is pushed by the first slope section B and swings clockwise in the plane crossing the optical axis of the main optical system 3. At this time, the small tube of the sub optical system 4
The base plate 10 whose end face 4c is perpendicular to the optical axis of the main optical system 3
Swing in the same direction while sliding on the back surface 10m above. 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 does not insert into the circular hole 10l. To reach.
After that, the motor 12 continues to intermittently rotate, so that the sliding contact portion 27c of the drive member 27 ascends the first slope section B of the cam 26a and reaches the second flat section C. Subsequently, the sliding contact portion 27c becomes the second
Although it slides down the slope section D, since the front end surface of the receiving shaft portion 27a contacts the flange 10i in the middle thereof, the sliding contact portion 27c separates from the cam 26a and faces the first flat section A, but does not contact. Leading to. Due to this displacement of the drive member 27 in the optical axis direction, the small cylinder 4c of the sub 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 abuts on the edge of the circular hole 10l. Reach the full evacuation position. At this time, the main optical system 3 has reached the retracted position.

The spring 29 supplies the biasing force for inserting the sub optical system 4 into the circular hole 10l 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. .

When the main optical system 3 reaches the retracted position, the switches SW3, SW4, SW5 shown in FIG. 4 are turned off and on, respectively. When the switch SW3 is turned off, the first path is cut off and the power supply to the motor 12 is stopped. Therefore, since the main optical system 3 is stationary at the retracted position and the sub optical system 4 is stationary at the completely retracted position, the optical system is composed of only the main optical system 3 and its focal length is in a wide-angle region. Both switches SW1 and SW5 are ON
Therefore, the automatic focus adjustment / shutter control circuit 31 is in an operable state, and the wide-angle optical system is capable of photographing.

The motor 12 is rotated by receiving power from the third path in response to the image capturing start operation, and displaces the main optical system 3 in the optical axis direction from the close-up of the wide-angle region to the infinity to perform focus adjustment. During the rotation of the motor 12 for adjusting the focus in this wide-angle region, the sliding contact portion 27c of the driving member 27 only faces the first flat section A and does not come into contact therewith, so the driving member 27 does not move, and the sub optical System 4 remains in the fully retracted position.

Then, the finder optical system is switched by the finder switching mechanism in the following manner in response to the change of the state. That is, the first finder optical system 5 is moved from the insertion position to the retracted position.

Since the base plate 10 is largely retracted because the telephoto state is switched to the wide-angle state, the rack 51 is largely retracted and the rack teeth are moved.
The cam plate 53 is largely rotated by the path of the 51b, the pinion 52a, the transmission shaft 52, the spur gear 52b, and the reduction gear 53a. The rotation of the cam plate 53 causes the activation tooth 52b to push the activation tooth 55b of the fan-shaped portion 55d of the switching drive member 55, and further drive tooth 53c and drive tooth 55c.
Since one tooth is lacking between the starting tooth 53b and the driving tooth 53c and between the starting tooth 55b and the driving tooth 55c, which mesh with each other, smooth meshing can be started without interference.

Then, as shown in FIG. 11, since the switching drive member 55 is rotated, the tip end portion of the engaging rod 57c is pushed by the first cam surface 55e, and the second objective lens 57 is centered on the swing shaft 57a. Then, when the tip end of the engaging rod 57c reaches the second cam surface 55f, the second objective lens 57 is held at a constant angle when it rotates counterclockwise by a set angle when viewed from above in FIG. In synchronization with the angular displacement of the second objective lens 57, the first objective lens 56 moves the switching drive member 55.
Along with the cam 55g, an arc is drawn, and the second objective lens 5
When 7 is facing the front, it moves by grabbing the end and becomes the state shown in FIG. 12 and FIG. 14 (B).

Thereafter, the driven pin 59a of the swing lever 59 reaches the area of the drive groove 54b from the first circumferential groove 54a of the cam groove 54. Then, the swing lever 59 rotates clockwise around the pivot 59b as viewed from above in FIG. 3, whereby the split groove 59e, the driven rod 58e,
The rectilinear frame 58 is pushed forward through the linear motion connecting arm 58d. When the rectilinear frame 58 is pushed forward, the tip end of the engagement rod 57c is disengaged from the second cam surface 55f of the switching drive member 55, so that the second objective lens 57 faces the front as before and the cam portion 55 is returned.
The rectilinear frame 58 and the second objective lens 57 without interfering with g.
Is the first objective lens 56 instead of the first objective lens 56.
It is pushed out to the position of 56 and the swing lever 59 moves the toggle spring 59d.
Thus, the lens is reversed and held at the wide-angle position, and the state shown in FIG. 13 and FIG.

In the wide-angle state, even if the cam plate 53 is rotated for focus adjustment, the vertical movement rod 58e of the rectilinear frame 58 is moved to the inner wall of the split groove 59e of the swing lever 59 and the finder storage portion 1a by the biasing force of the toggle spring 59d. It is held by being held between the front end of the provided guide groove 1f. Driven pin 59a of swing lever 59
Moves within the range of the second circumferential groove 54c of the cam groove 54 of the cam plate 53, and the driven pin 59a does not come into contact with the side wall of the second circumferential groove 54c. Cam groove 54
Since it moves within the area of the second circumferential groove 54c of the swing lever 59
Does not swing, and the ends of the drive teeth 55c of the fan-shaped portion 55d of the switching drive member 55 are in sliding contact with the sliding contact edge 53d of the cam plate 53, so that the second objective lens 57 does not displace, It is held stable.

FIG. 7 is a diagram showing the relationship between the amount of extension of the base plate 10 and the switching states of the photographing optical system and the finder optical system. The state X of the photographing optical system and the state Y of the finder optical system are made to correspond to each other. The telephoto state is represented by W and the wide-angle state is represented by T.

As shown in the figure, in the area (a) where the extension amount of the base plate 10 is small, both the photographing optical system and the finder optical system are in a stable wide-angle state, and the base plate 10 is infinite in the area (a). It is possible to move between the far ∞ and the close range N in the wide angle state. When the operation for switching the state is performed, both optical systems are displaced toward the telephoto state via the area (b), and a stable telephoto state is set in the area (c), and infinity ∞ and telephoto are set in the area (c). It is possible to move to and from the closest distance N in the state. The same applies when switching from the telephoto state to the wide-angle state.

(3) When the dust cover is displaced from the open position to the closed position from the telephoto state, switch SW1 turns off and the logic circuit
The input terminal 40a of 40 goes low and the output terminal of the exclusive OR circuit 40e goes high. The following operation is the same as in (2). Even though the focal length selection member 2 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 at the fully inserted position. To the complete retracted position. When the main optical system 3 is displaced to the retracted position, the dustproof cover can be displaced to the closed position. Switch SW1 when the dustproof cover reaches the closed position
Since the switch SW1a having the same phase as is turned off, the power supply to the automatic focus adjustment / shutter control circuit 31 is cut off, and shooting is impossible.

Similarly, in the finder optical system, the telephoto position is switched to the wide-angle position.

(4) When the dust cover is displaced from the wide-angle state to the closed position, the switch SW1a, which is in phase with the switch SW1, is turned off, so the power supply to the automatic focus adjustment / shutter control circuit 31 is cut off and photography is impossible. Become.

(5) When the focal length selection member 5 is switched from the wide angle state to the telephoto position, the switch SW2 is turned on and the logic circuit 4
The 0 input terminals 40a and 40b are both at the high level. Both output terminals of exclusive OR circuit 40e and NOR circuit 40f are Low
Since it becomes the level, the output terminal of the OR circuit 40g is inverted to the Low level, and the output terminals 40c and 40d of the logic circuit 40 are respectively Lo
Inverts to w, High level. As a result, the switches SW7a and SW7b shown in FIG. 8 are turned off and the switches SW8a and SW8b are turned on. Since the main optical system 3 is at the retracted position, the switch SW3,
SW4 and SW5 are in OFF, ON, and ON states, respectively. switch
Since SW8a 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 the case 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, comes out of the circular hole 10l, and is displaced to the incomplete retracted position (shown in FIG. 8). The displacement in the optical axis direction is caused by the rotation of the cam 26a and the driving member 2 in the second slope section D.
This is because the sliding contact portion 27c of 7 is pushed up. When the sub optical system 4 comes out of the circular hole 10l, the drive member 27 becomes slidable in the direction crossing the optical axis of the main optical system 3. Continued motor 12
Since the sliding contact portion 27c is pushed by the second inclined surface section D in the direction crossing the optical axis with the rotation, the driving member 27 swings in the same direction, and the end surface of the small tube 4c of the sub optical system 4 is moved to the base. Back side of board 10m
While sliding up, move from the incomplete retracted position to the incomplete inserted position. When the main optical system 3 approaches the feeding position, the driving member 27
The free end 27d contacts the locking member 10j and is prevented from swinging, and the sub optical system 4 stops at the incomplete insertion position. Since the motor 12 continues to rotate after that, the sliding contact portion 27 of the drive member 27
c climbs up the second slope section D of the cam 26a and reaches the second flat section C.

Subsequently, the sliding contact portion 27c slides down the first slope surface section B, but the front end surface of the bearing portion 27a abuts the collar 10i in the middle thereof, so the sliding contact portion 27c is separated from the cam 26a, and the first flat section It reaches a state where it faces A but does not contact. Drive member 27 accompanying this
Of the holding barrel 4a of the sub optical system 4 by the displacement in the optical axis direction of
The 4c contacts the guide surface 28b of the positioning means 28, is guided by the guide surface 28b, and is inserted into the guide surface 28a.
Comes into contact with the contact surface 28c of the positioning means 28, reaches the complete insertion position shown in FIG. 5, and the positioning of the sub optical system 4 is completed. At this time, the main optical system 3 has reached the delivery position.

The bearing member 27a comes into contact with the collar 10i, so that the driving member 27
The spring 29 supplies a biasing force for engaging the sub optical system 4 with the positioning means 28 after the stop of the displacement in the optical axis direction.

When the main optical system 3 reaches the extended position, the switches SW3, SW4, and SW5 are turned on, off, and on, respectively, as described in (1). When the switch SW4 is turned off, the second path is cut off and the power supply to the motor 12 is stopped. Therefore the first
As shown in the figure, the main optical system 3 is at the extended position and the sub optical system 4
Are stationary at the full insertion position, and a synthetic optical system is formed, and the focal length thereof is in the telephoto range. Also switch SW
Since both 1a and Sw5 are ON, the automatic focus adjustment / shutter control circuit 31 is in an operable state, and shooting with the telephoto optical system is possible.

The finder optical system is switched from the wide-angle state to the telephoto state according to the switching operation.

That is, when the main optical system element and the sub optical system 4 are switched to the telephoto state, the base plate 10 greatly moves forward, so that the cam plate 53 largely rotates contrary to the above. As a result, the vertical pin 59a of the rocking lever 59 is engaged with the second circumferential groove 54c of the cam groove 54.
From the state to the drive groove 54b, the swing lever 59 rotates counterclockwise from the state shown in FIG. 13 and FIG. 14 (C), and pulls back the second objective lens 57 and the rectilinear frame 58.

When the second objective lens 57 and the rectilinear frame 58 retract, the tip end of the engaging rod 57c abuts on the second cam surface 55f of the cam portion 55g of the switching drive member 55, and the second objective lens 57 is centered on the swing shaft 57a. The state shown in FIG. 12 and FIG. 14 (B), which is held in a state of being tilted at an angle, is obtained.

In synchronization with this, the drive teeth 53c mesh with the drive teeth 55c, the switching drive member 55 is rotated clockwise, and the first objective lens 56
Rotates in an clockwise direction around the swing shaft 55a,
The state shown in FIG. 1 and FIG. 14 (A) is obtained. Next, the tip of the engaging rod 57c reaches the first cam surface 55e of the cam 55g,
Finally, the second objective lens 57 faces the front, and the rectilinear frame 58 returns to the front of the front of the second objective lens 57 and enters the telephoto state shown in FIG.

(6) Switch SW1 turns on when the dust cover is displaced toward the open position from the state where the dust cover is covered in the telephoto state.
And the input terminals 40a and 40b of the logic circuit 40 are both Hig.
It becomes the h level. The following is the same operation as described in (5).

FIG. 15 shows another embodiment of the present invention. In the embodiment, the second objective lens 57 is moved forward instead of the first objective lens 56, while the first objective lens is simply moved forward. Was designed to escape.

That is, FIG. 15 (A) shows a wide-angle state,
The first objective lens 60 is a concave lens. To set the telephoto state, the second objective lens 57 is moved to the first position as shown in FIG.
The first objective lens 60 is displaced so that it is tilted to retract from the movement trajectory of the objective lens 60, and then the first objective lens 60 is displaced, and after the first objective lens 60 has escaped, the second objective lens 57 as shown in FIG. 15 (C). To return to the front.

Although the female screw member is rotationally driven by the motor as the drive source in the above embodiment, it goes without saying that the same result can be obtained by rotationally driving the male screw shaft.

"Effect of the Invention" According to the optical system moving device of the present invention, by driving one of the male screw shaft and the female screw member screwed together, the speed is greatly reduced and the other is relatively linearly driven. As a result, the optical system is moved straight and the interlocking mechanism that follows the optical system is driven, so a large reduction ratio can be obtained with a simple structure, and the optical system and its interlocking movement can be achieved with a single drive source. Since it drives the mechanism and is driven by at least two axes, it is stable during driving, and it can be operated reliably in synchronization, the space is minimized, and the cost is reduced by a simple configuration. You can

[Brief description of drawings]

1 to 14 show an embodiment of the present invention. FIG. 1 is a vertical sectional view of a camera, FIG. 2 is a horizontal sectional view of a camera, and FIG.
FIG. 4 is a perspective view of the internal mechanism of the camera, FIG. 4 is a perspective view of the photographing optical system switching mechanism, FIG. 5 is a cross-sectional view of essential parts, FIG. 6 is a cam line diagram, and FIG. FIG. 8 is a diagram showing the relationship between the switching states of the photographing optical system and the finder optical system, FIG. 8 is a motor control circuit diagram for driving the optical system, FIG. 9 is a logic circuit diagram for controlling the operation of the motor control circuit, and FIG. Is a plan view of the finder switching device in the telephoto state, FIGS. 11 and 12 are plan views of the same intermediate state, FIG. 13 is a plan view of the same wide-angle state, and FIG. 14 is a view showing the switching state of the finder optical system. FIG. 15 and FIG. 15 are explanatory views showing a switching state of the finder optical system of another embodiment. 1 ... Camera body, 1a ... Finder housing 3 ... Main optical system, 4 ... Sub optical system 10 ... Base plate, 12 ... Motor 26 ... Cam gear, 27 ... Driving member 51 ... Rack, 53 …… Cam plate 55 …… Switching drive member, 56 …… First objective lens 57 …… Second objective lens

Claims (1)

[Claims] 1. An optical system moving device in an optical device in which an optical system is supported on an optical device body so as to be movable in an optical axis direction, wherein at least two male screw shafts provided on the optical device body and the male screw are provided. An optical system moving device is configured by an internal thread member provided on the side of the optical system that is respectively screwed with an axis, and each of the internal thread members holds an optical system and transmits light to a supporting member that moves in the optical axis direction together with the optical system. Axial direction and axial direction are made the same, and axially immovable and pivotally attached, and each of the male screw shafts is screwed onto the female screw member on the optical device main body so as to extend in parallel to the optical axis, and the female screw member is provided. A pair of a male screw shaft and a male screw shaft is provided with a drive source that rotationally drives either the female screw member or the male screw shaft, the interlocking mechanism that follows the support member of the optical system is provided, and the interlocking device is synchronized with the optical system. To activate the mechanism Optical system moving apparatus characterized by a.