JPH06222424A - Camera - Google Patents

Abstract

PURPOSE:To provide a camera capable of automatically moving a dust-proof cover to its closing position and safely protecting a photographic lens by transmitting the driving force of a lens motor-driving means. CONSTITUTION:When a base plate 10 is moved toward a housing position by rotating the motor, an oscillating lever 113 for opening/closing the dust-proof cover 102 is moved toward a projecting cam 121 in accordance with the movement of the base plate 10. The lever 113 is shifted to the left in accordance with the inclined cam face 121a of the projecting cam 121 so as to be engaged with the left surface of the projecting cam 121 and then, it is stopped in accordance with the stop of the base plate 10 moving to the housing position. By shifting the oscillating lever 113 to the left, the lens is automatically covered with the dust-proof cover 102 which moves linked with a main optical system 3 moving to the housing position. Thus, there is not such a trouble of forgetting to close the dust-proof cover in the case of housing the camera, so that the photographic lens is safely protected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographic lens protective cover device, and more particularly to a photographic lens protective cover device for covering the front surface of a photographic lens that is retracted along an optical axis.

[0002]

BACKGROUND OF THE INVENTION A lens cover (hereinafter referred to as "dust cover") that protects a taking lens from damage caused by contact with an external object and prevents dust and fingerprints from adhering to the front side of the taking lens. A device that can be opened and closed is already known, for example, from Japanese Patent Laid-Open No. 57-196222. This conventionally known dustproof cover device can move the taking lens through the dustproof cover in the opened state, and further, when the taking lens is retracted and moves to the storage position, the taking lens is moved. The dustproof cover is configured to close in association with the rotation of the distance adjusting member of the autofocus device. Therefore, if this known dustproof cover device is used, there is an advantage that the photographing lens outer cylinder for accommodating the dustproof cover can be made short, the operation is easy, and the camera body can be made compact.

However, in this conventionally known dustproof cover device, the locking claw for holding the dustproof cover in the open position and the distance adjusting member for moving the taking lens to the storage position are released at the same time. An operating member for unlocking the locking claw is required. The device therefore has the drawback of being complicated in construction and costly. Further, in this known dustproof cover device, a taking lens barrel is provided between a cover drive ring for opening and closing the dustproof cover and a distance adjusting member having a cam for moving the taking lens in the optical axis direction. Has been. Therefore, for example, a so-called bifocal camera that transforms the composite focal length of the shooting lens by extending the injection lens and adding an auxiliary lens to the trace, or macro shooting that is extremely close to the normal shooting area beyond the closest distance is possible. Like a possible camera,
In a camera having a particularly large read-out amount, the distance between the distance adjusting member and the cover driving ring is extremely large. Therefore, not only the length of the charging arm that transmits the rotation of the distance adjusting member to the cover driving ring becomes long, but also the operation member for releasing the locking claws that respectively lock the distance adjusting member and the cover driving ring. The pressing portion also has to be extended for a long time, and there is a risk that the operation will become unsmooth.

In this known dustproof cover device, the cover drive ring and the distance adjusting member are each rotated by the urging force of the spring to close the dustproof cover or move the photographing lens in the retracting direction. ing.
Therefore, each time before photographing, it is necessary to charge the spring and open the dustproof cover to move the photographing lens to the extended position.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks of the known dustproof cover device, and the opening / closing mechanism of the dustproof cover does not become complicated even if the moving amount of the photographing lens is increased, and the photographing lens is repeated. When in the retracted position, the dustproof cover can be opened / closed by operating an external operating member, and when the operating member is switched to the closed position, even if the shooting lens is in the extended position, the shooting lens can be moved to the retracted position. An object of the present invention is to provide a dust-proof cover device for a photographing lens in which the dust-proof cover is automatically closed in conjunction therewith.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a dust-proof camera in which a front surface of a taking lens which is fed from an extended position according to an operation of an operating member is covered with a dust-proof cover. A cover opening / closing member that is displaced in conjunction with the cover and is movable in the optical axis direction together with the taking lens; and a cover opening / closing member that is inserted from outside the track in the optical axis direction of the cover opening / closing member according to the operation of the operating member. When the photographing lens is in the built-in position, the dust cover is opened / closed by inserting / removing the engaging member on the track, and the photographing lens is extended position. In the case of, the cover opening / closing member is configured to automatically close the dust-proof cover by inserting the engaging member into the orbit so that the taking lens engages the engaging member while the taking lens is retracted. It is to technically gist of.

[0007]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. 1 and 2 are cross-sectional views showing a first embodiment of the present invention applied to a bifocal camera, and FIG. 1 shows a telephoto state with a long combined focal length by adding a sub optical system,
FIG. 2 shows a state in which the sub-optical system is retracted outside the photographing optical path and the photographing lens and the lens barrel are housed in the camera body. 3 is a perspective view of the embodiment shown in FIG. 1 in a telephoto state,
FIG. 4 is a perspective view in a wide-angle state in which the taking lens barrel is retracted,
FIG. 5 is a perspective view of the embodiment in the storage state shown in FIG.

In FIGS. 1 and 3, a dust cover 102, which will be described in detail later, is provided on the front surface of the main optical system 3 provided in the taking lens barrel 3A that is extended from the camera body 1 in the optical axis direction. Is provided so as to be openable and closable, and a sub optical system 4 is provided behind the main optical system 3 so as to be insertable and removable. A focal length selection member 105 for switching the focal length of the photographing optical system and opening and closing the dustproof cover 102 is provided on the upper surface of the camera body 1 so as to be always operable. The dustproof cover 102 is provided immediately before the main optical system 3 in the taking lens barrel 3A, and is in the open position in FIGS. 1 and 3. Further, the focal length selection member 105 is
As shown in FIG. 3, the main optical system 3 is at the telephoto position in the extended state, and its indicator 105A faces the symbol "T" attached to the upper surface of the camera body 1. In this state, the sub optical system 4 is inserted on the optical axis behind the main optical system 3, and the combined focal length of the main optical system 3 and the sub optical system becomes longer than the focal length of the main optical system 3. It has been switched.

In FIG. 4, the focal length selection member 105 is shown.
105A faces the symbol "W" attached to the upper surface of the camera body 1, and in this case, the main optical system 3 together with the taking lens barrel 3A moves from the extended position in FIG.
The auxiliary optical system 4 moves to the retracted position retracted to the side and retracts to the retracted position outside the photographing optical path as shown in FIG. Therefore, only the main optical system 3 is on the photographing optical path, and its focal length is a short focus (wide angle). However, the dustproof cover 102 is left open.

In FIGS. 2 and 5, the indicator 105A of the focal length selection member 105 faces the symbol "OFF" attached to the upper surface of the camera body 1. In this state, the main optical system 3 is in the retracted position where it is housed in the camera body 1 together with the taking lens barrel 3A, and the sub optical system 4 is held retracted to the outside of the taking optical path. However, the dustproof cover 102 covers the front surface of the main optical system 3 and is in a closed state.

6 and 8 are partially cutaway plan views of FIGS. 1 and 2, respectively, showing conductor lands C of the camera body.
Sliding contact pieces Br ₁ and Br that come into contact with d ₁ and Cd ₂ , respectively.
₂ is linked with the focal length selection member 105, and the switch Sw ₁ is composed of a long strip-shaped conductor land Cd ₁ and a sliding contact piece Br ₁ .
A switch Sw ₂ is composed of the short conductor land Cd ₂ and the sliding contact piece Br ₂ . The switch Sw ₁ is turned on when the focal length selection member 105 is at the positions of the wide-angle symbol W and the telephoto symbol T, and is turned off when it is displaced to the symbol “OFF” position. Further, the switch Sw ₂ is turned on only when the focal length selection member 105 is at the position of the telephoto symbol T.
N, and O at other wide-angle symbols W and OFF symbol positions
It becomes FF. These two switches Sw ₁ and Sw
_2, controls the rotation of the motor 12 described later in order to displace the main optical system 3 and the sub optical system 4. It should be noted that the photographing lens barrel 3A has a flange 3B on the outer circumference, the focal length selection member 105 is switched to the wide-angle position (position of symbol W), and the photographing lens barrel 3A is retracted as shown in FIG. When the camera is carried to the position, the stepped portion 1a of the camera body 1 is filled with 3B so that dust and water droplets can be prevented from entering the camera body when the camera is carried.

FIG. 9 is a perspective view showing an optical system displacement mechanism controlled by the focal length selection member 105, and FIG. 10 is shown in FIG.
FIG. 3 is a perspective view of the base plate 10 of FIG. Both show a telephoto state in which the main optical system 3 is in the extended position as shown in FIG. 1 and the sub optical system 4 is inserted on the optical axis behind the main optical system 3. In FIG. 9, an opening 10a through which a photographing light beam passes is provided in the central portion of a base plate 10, and an aperture / shutter device 11 and a main optical system 3 are provided in front of it as shown in FIG.
And are fixed. The motor 1 is provided on the upper back surface of the base plate 10.
2 is fixedly installed, and a Pepel gear 12a is fixedly installed at one end of the rotation shaft of the motor 12 as shown in FIG. A pepel gear 13 rotatably supported by the base plate 10 is engaged with the peper gear 12a, and a spur gear 13a integral with the gear 13 is engaged with a gear 14 also rotatably supported by the base plate 10. 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 1c 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 Pepel gear 12b is fixedly installed at the other end of the rotating shaft of the motor 12. A pepel gear 16 rotatably supported by the base plate 10 is engaged with the peper gear 12b, and an input gear 17a of a gear train 17 rotatably supported by the base plate 10 is engaged with a spur gear 16a integral with the gear 16. A through hole is formed in the center of the output gear 17b of the gear train 17, and a female screw having the rotation center of the gear 17b as an axis is formed in the through hole. This female screw has a guide shaft 1
The male screw cut in 8 is screwed. 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 10e 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 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. Another guide shaft 19 extending in the optical axis direction is also planted in the substrate 1c. The guide shaft 19 includes a through hole 10 e of the overhanging portion 10 d and a through hole 1 of the base plate 10, which are provided on the back surface of the base plate 10.
0f is slidably inserted in the axial direction, so that the base plate 1
0 is held perpendicular to the optical axis.

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 main optical system 3 and the diaphragm / shutter device 11 fixedly moved parallel to the optical axis direction are displaced in the optical axis direction between the feeding position and the feeding position. FIG. 9 of the base plate 10
A printed circuit board 20 is fixedly provided on the right side surface. Conductor lands 20a-2 are provided on the surface of the printed circuit board 20.
0c is 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 compose a switch Sw3, the sliding contact piece 22 and the conductor land 20b compose a switch Sw4, and the sliding contact piece 23 and the conductor land 20c compose a switch Sw5. Switch Sw3
When the main 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. Switch Sw
3, Sw4 works as a limit switch, and the main optical system 3
When the motor is displaced to the feeding position or the feeding position, the motor 1
Turn off the power supply of 2. The switch Sw5 is a switch for disabling 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 adjustment / shutter control circuit 31 (shown in FIG. 12). The film 24 is provided behind the photographing opening 14 formed in the substrate 1e.

Next, the sub-optical system insertion / removal mechanism will be described with reference to FIG. In FIG. 10, a reduction gear train 25, a cam gear 26, and a driving member 27 are pivotally supported on the back surface of the base plate 10, and the driving member 27 holds the sub optical system 4. The input gear 25s of the reduction gear train 25 is the same as the above-mentioned Pepel gear 13
Is engaged with the spur gear 13a that is integral with
The final gear 25b of No. 5 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 two-dot broken line) retracted from the photographing light flux. The cam gear 26 and the drive member 27 are rotatably supported by a fixed shaft 10g planted in the base plate 10, and the drive member 27 is further fixed to the fixed shaft 10g.
It is slidable in the axial direction on g, and is biased by a compression spring 30 so as to come into pressure contact with the front cam 26a of the cam gear 26. 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 drives the driving member 27 when the sub optical system 4 is brought to the insertion position. Of the driving member 27 is locked by the locking member 10k when the sub optical system 4 is brought to the retracted position.

The front cam 26a of the cam gear 25 is shown in FIG.
In the cam diagram of, the rotation angle θ is 0 as shown by the thick line.
The first flat section A where the head is 0 and does not change from 0 to θ1
And a first slope section B where the head h increases linearly from 0 to h1 from θ1 to θ2, a second flat section C where the head b does not change at b1 from θ2 to θ3, and a head b from θ3 to 306 °. Is a second slope section D that decreases linearly from b1 to 0.

When the drive member 27 is engaged with the first flat section A, the sub optical system 4 is in the insertion position shown in FIG. 1 or the retracted position shown in FIG. Since the cylinder 4C is inserted into the front opening 10a or the circular hole 10l (see FIGS. 1 and 2), even if the front cam 25a rotates, the sub optical system 4 is fixedly placed at that position. . While the front cam 26a rotates normally or reversely and the drive member 27 is engaged with the first slope section B and the second slope section D, the sub optical system 4 moves in the optical axis direction according to the cam lift. The small cylinder 4C is moved to open the opening 10a or the circular hole 1
When the vehicle escapes from 0l, it is configured to rotate integrally with the cam gear 26 by an angle α as shown in FIG.

FIG. 12 shows a motor 12 for driving the base plate 10 for holding the taking lens barrel 3A which internally comprises the main optical system 3 and the dust cover 2 and the drive member 27 for holding the sub optical system 4. FIG. 3 is a motor control circuit diagram for controlling the motor. In FIG. 12, the motor 12 is driven by the following three power supply circuits.
The first path is a path of the positive electrode of the power source B-the switch Bw3-the switch Sw7a-the motor 12-the switch Sw7b-the negative electrode of the power source B. 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 positive pole of the power source B-the switch S.
w4-switch Sw8a-motor 12-switch SwB
b-a path of the negative electrode of the power supply B. 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 Sw7s, Sw7b, Sw8a, and Sw8b are semiconductor switches whose opening / closing is controlled by a logic circuit 40 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. The automatic focus adjustment / shutter control circuit 31 includes an automatic focus adjustment control circuit 31A and a shutter control circuit 31B,
When the shutter release button (not shown) is pressed, the automatic focus adjustment control circuit 31A starts to operate, and when the focus adjustment is completed, the shutter control circuit 31B operates to open and close the shutter device 11 also serving as the diaphragm. ing. Switches Sw1a and Sw5 connected in series are inserted in the power supply path of the control circuit 31. Switch S
w1a is a semiconductor switch whose opening and closing is controlled in phase with the switch Sw1 (see FIG. 4), and switch Sw5 is used when the main optical system 3 is in the extended position and the extended position (the sub optical system 4 is Only when it is in the insertion position and the retracted position). These prevent the automatic focus adjustment and the shutter from operating when the dust-proof cover 102 and the optical systems 3 and 4 are in positions unsuitable for photographing.

The semiconductor switches of the switches Sw7a, Sw7b, Sw8a and 8w8b are controlled by the logic circuit 40 as shown in FIG. The logic circuit 40 includes a pair of input terminals 40a and 40b and a pair of output terminals 40c and 4b.
And 0d. The input terminal 40a is the switch S
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 control terminal of the switches Sw8a and 8b. It is connected. The switch Sw1 is turned on for the input terminal 40a.
Becomes high level and switch Sw1 is off
, That is, when the focal length selection member 105 is in the OFF position, the low level is set. The input terminal 40b becomes High level when the switch Sw2 is ON, that is, when the focal length selection member 5 is at the telephoto position, and the switch S
When w2 is OFF, that is, when the focal length selection member 105 is in the wide-angle position and the OFF position, the level becomes Low. The output terminal 40c turns on both the switches Sw7a and Sw7b when it is at a high level, and turns off both when it is at a low level. The output terminal 40d turns on both the switches Sw8a and Sw8b when it is at a high level, and turns off both when it is at a 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 knob 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 knob 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 40b, and the output terminal of the inverter 40h is the output terminal 40d of the logic circuit 40.
It is connected to the.

The following table shows the position of the focal length selection member 105,
The states of the switches Sw1 and Sw2 that are switched depending on their positions, the levels of the input terminals 40a and 40b, the output terminals 40c and 40d of the logic circuit 40, and the switches Sw7a and Sw7.
The relationship among the states of b, Sw8a, and Sw8b, and the positions of the main optical system 3 and the sub optical system 4 is summarized.

[0024]

[Table 1]

FIG. 14 is a perspective view showing the construction of a dustproof cover opening / closing mechanism which is an essential part of the present invention, in which the main optical system 3 is extended to the telephoto state and the dustproof cover is open. The taking lens barrel 3A and the camera body 1 are omitted. In FIG. 14, the dust-proof cover 102 is composed of two half-moon shaped shield plates 102A and 102B, which are attached to one arm 103a, 104a of two crank levers 103, 104 at a constant angle via shafts 101A, 101B, respectively. It is rotatably supported. A pin 106 is planted on the other arm 103b of one crank lever 1-C3, and this pin 106 is attached to the other crank lever 104.
Of the other arm 104b is engaged with the sliding groove 104c.

On the other hand, a flange 108 is fixed to one end of a transmission shaft 107 rotatably supported by the base plate 10, and one crank lever 103 is rotatably held by the flange 108. Also, this crank lever 103
Is urged by a coil torsion spring 109 to rotate counterclockwise in FIG. 14, and the other arm 103b is constantly in pressure contact with a pin 110 implanted in the flange 108. The other crank lever 104, which is connected to one crank lever 103 via a pin 106, is rotatably supported by a pin shaft 111 that is planted in the base plate 10. Furthermore, at the other end of the transmission shaft 107 penetrating the base plate 10, a swing lever 113 biased clockwise by a tension spring 112 in FIG. 14 is fixed. In addition,
The clockwise movement of the crank lever 103 is prevented by coming into contact with the fixing pin 114 planted on the base plate 10.

On the other hand, the rotation of the focal length selection member 105 provided in the camera body 1 is transmitted to the crank lever 116 via the eccentric pin 115, and the crank lever 11
The engaging pin 117, which is planted on one of the six arms 116a, is rocked. This engagement pin 117 is
It engages with a groove 120 formed in an upper protruding portion 119A of a slide plate 119 supported by two guide pins 118 implanted in the camera body.

The slide plate 119 is used for the crank lever 11
When 6 rotates, it slides to the left and right in FIG. 14 parallel to the base plate 10. A protruding cam 121 is provided below the slide plate 119 so as to protrude in the optical axis direction.
A cam surface 121 a that can be engaged with the swing lever 113 is formed at the tip of the protruding cam 121. On this cam surface 121a, the focal length selection member 105 is rotationally displaced from the telephoto position to the OFF position, and the slide plate 119 is moved to the position shown in FIG.
4, when the base plate 10 moves to the retracted position after moving to the left, the upper right side surface of the swing lever 113 is engaged and the swing lever 113 is rotated counterclockwise. There is.

As for the positional relationship between the swing lever 113 and the protruding cam 121, as shown in the explanatory view of FIG. 15, when the focal length selecting member 105 is in the telephoto position, the swing lever 113 moves the protruding cam 121. Further, the left side surface 121b of the protruding cam 121 is placed away from the orbit L of the swing lever 113 in the optical axis direction (see FIG. 15A). When the focal length selection member 105 is switched to the wide-angle position as shown in FIG. 15B, the swing lever 113 moves along the track L from the broken line position to the solid line position as the base plate 10 moves, and the protruding cam 121 also moves to the chain line position. To the solid line position. In this case, the left side surface 121b of the protruding cam 121 is in a position close to the track L of the swing lever 113, but is placed in a position where it does not contact the swing lever 113. Next, when the focal length selection member 105 is placed at the OFF position as shown in FIG. 15C, the protruding cam 121 is inserted from the position of the chain line onto the track L of the rocking lever 113 as shown by the solid line, and the rocking lever 113 is moved. 113 contacts the left side surface 121b of the protruding cam 121, is pressed and moved leftward, and is placed at the solid line position. At this time, the swing lever 113 rotates counterclockwise in FIG.
The dust cover 102 is closed. Also, the focal length selection member 1
When 05 is rapidly rotated from the telephoto position to the OFF position as shown in FIG.
Move from the position [a] to the position [c]. However, since the movement of the swing lever 113 that moves along the optical axis along with the base plate 10 is delayed, the swing lever 113 moves from the position (1) to the position (2) along the track L. The swing lever 113 contacts the cam surface 121a up to the position (2), is displaced leftward along the cam surface 121a to reach the position (3), and is in the same state as in FIG. 15C. Is configured.

Next, the operation of the above embodiment will be described. [1] When the focal length selection member 105 is pressed to the telephoto position. As shown in FIG. 3, when the focal length selection member 105 is placed at the telephoto position (the position of the symbol T), the crank lever 11 interlocked with the focal length selection member 105.
6 is at a position rotated clockwise as shown in FIG. 14, and the slide plate 119 is moved to the rightmost side in FIG. Therefore, as shown in FIG. 15A, the slide plate 1
The protruding cam 121 of 19 is placed at a position separated from the track L of the swing lever 119 to the right.

The swing lever 119 has a tension spring 112.
The crank lever 103 is placed at a position where it is rotationally displaced clockwise as shown in FIG. In addition, the shield plates 102A and 1A of the dustproof cover 102
02B are open apart from each other. On the other hand, the main optical system 3 and the base plate 10 are in the extended position as shown in FIG. 1, and the sub optical system 4 is inserted on the optical axis of the main optical system 3.

Further, as shown in FIG. 6, the focal length selecting member 105 is provided.
Is in the telephoto position (symbol T position), the sliding contact piece Br ₁ of the switch Sw1 and the sliding contact piece Br ₂ of the switch Sw2 interlocking therewith are in contact with the conductor lands Cd1 and Cd2, respectively. Therefore, since the switches Sw1 and Sw2 are both in the ON state, the input terminal 40 of the logic circuit 40
Both a and 40b are at high level. The output terminals of the exclusive of circuit 40e and the knob circuit 40f are Lo.
The output terminal of the OR circuit 40g becomes low level, and the output terminals 40c and 40d of the logic circuit 40 become low level and high level, respectively. As a result, the switches Sw7a and Sw7b shown in FIG. 12 are turned off, and the switches Sw8a and Sw8b are turned on. Since the main optical system 3 is in the extended position, the switches Sw3, Sw4, and Sw5 are turned on, off, and O, respectively, as shown in FIG.
In the N state. Switches Sw7a and Sw7b are OFF
Therefore, the above-mentioned first path for driving the motor 12 is not formed, and since the switch 8w4 is OFF, the above-mentioned second path is not formed.

In this case, the main optical system 3 is at the feeding position,
Since the sub optical system 4 is located at the insertion position on the optical axis, both optical systems form a synthetic optical system, and the focal length thereof is in the telephoto range. Both switches Sw1a and Sw5 are ON
Therefore, the automatic focus adjustment and shutter control circuit 31 is in the operable state, and the photographing with the telephoto optical system is possible. FIG. 1 shows the state at this time, and the motor 12 is supplied with power through the above-described third path and rotates in response to the shooting start operation by pressing the shutter release button. The rotation of the motor 12 for focus adjustment in this telephoto range causes the gear 1 to rotate.
4 and 17b rotate to form the base plate 10 together with the combining optical systems 3 and 4.
Is extended from the infinity position to the closest position according to the leads of the screws of the guide shafts 15 and 18, and automatic focusing is performed.

The cam gear 26 also rotates via the reduction gear train 25 in accordance with the rotation of the motor 12 for adjusting the focus. However, the front cam 25a engages the drive member holding the sub optical system 4 with the engagement point R (composite optical system 3, composite optical system 3, in the first flat section A that is close to the first slope section B in FIG. 11).
4 corresponds to the close-up distance position of 4) to the engagement point S (corresponding to the infinitely transparent position of the combining optical systems 3 and 4) only in contact and slide in the telephoto side focus adjustment section 1. Therefore, the sub optical system 4
Is not moved in the optical axis direction or in the direction perpendicular to the optical axis within the rotation range of the cam gear 26 that rotates during focus adjustment. Therefore, the main optical system 3 and the sub optical system 4 are integrated and moved together with the base plate 10 in the optical axis direction so that focus adjustment can be performed without trouble.

[2] When the focal length selection member 15 is switched from the telephoto position to the wide angle position. When the focal length selection member 15 is switched from the telephoto position (position of symbol T) to the wide-angle position (position of symbol W) as shown in FIG. Is rotated counterclockwise to the intermediate position to move the slide plate 119 to the left intermediate position. By the leftward movement of the slide plate 119, the protruding cam 121 moves to a position close to the track L of the swing lever 113, as shown in FIG. Base plate 1
Even if 0 moves to the retracted position, the swing lever 113 does not come into contact as shown by the solid line.
3 is held in the same position as in FIG. 14 by the urging force of the tension spring 112. Therefore, the dustproof cover 102 is left open.

On the other hand, when the focal length selecting member 105 is switched from the wide-angle position (the position of the symbol W) to the telephoto position (the position of the symbol T), as shown in FIG. The contact is cut off from Cd2. Therefore, the switch Sw2 is turned off, and the input terminal 40b of the logic circuit 40 in FIG. 9 is set to Low level. The output terminal of the exclusive OR circuit 40e is Hi.
Since it becomes gh level, the output terminal of the OR circuit 40g is at H level.
Invert to high level and output terminal 40 of logic circuit 40
c and 40d are respectively inverted to High and Low levels. As a result, the switches Sw7a and Sw7 shown in FIG.
b is ON, and switches Sw8a and Sw8b are OFF
Becomes However, since the main optical system 3 is still in the extended position, the switches Sw3, Sw4, Sw5 are set as shown in FIG.
Are in the ON, OFF, and ON states, respectively, and the switches Sw7a and Sw7b are ON, so the power source B-Sw3 is
The above-mentioned first path composed of -Sw7a-motor 12-Sw7b-power supply 2 is formed, and the motor 12 is started. Therefore, the motor 12 has the gear 1 that is screwed with the guide shafts 15 and 16.
10, 4 and 17b are rotated counterclockwise to move the main optical system 3 and the sub optical system 4 together with the base plate 10 toward the retracted position.

The base plate 10 moves to the infinity position in the deceleration area of the synthetic optical systems 3 and 4, and as soon as it exceeds the infinity position, the switch Sw4 is turned on and the switch Sw5 is turned off. When reaches the short distance position in the wide angle region, the switch Sw3 is turned off, and the switch Sw5 is turned on again. This switch S
By turning off w3, the aforementioned first path is cut off, and the motor 12 stops rotating. Further, the flange portion 3B of the taking lens barrel 3A is inserted into the camera body 1 as shown in FIGS. At this time, the swing lever 113 for opening and closing the dustproof cover 102 is not shown in FIG.
As shown in [b], it moves from the dotted line position to the solid line position close to the left side surface 121b of the protruding cam 121.

While the switch Sw5 is in the OFF state, that is, while the base plate 10 is moving to the wide-angle range beyond the telephoto range,
Since the automatic focus adjustment / shutter control circuit 31 is in the inoperative state, the focus adjustment is not performed even if the shutter / release button is pressed. However, when the base plate 10 reaches the close-up position in the wide-angle region, the switch Sw5 is turned on, so that the focus can be continuously adjusted without stopping the motor 12 by pressing the shutter release button.

As described above, while the base plate 10 moves from the telephoto area to the wide-angle area, the sub optical system 4 moves the cam gear 26 from the insertion position on the optical axis of the main optical system 3 to the retracted position off the optical axis. It moves according to the rotation of the front cam 26a. Next, the movement process of the sub optical system 4 will be described. When the motor 12 starts to rotate due to the formation of the above-described first path (power supply E-Sw3-Sw7a-motor 12-Sw7b-power supply E), the cam gear 26 moves clockwise in FIG. 6 via the reduction gear train 25. Start spinning. The base plate 1 is rotated by the rotation of the motor 12.
When 0 is slightly retracted beyond the infinity position (corresponding to the engagement point 5 in FIG. 11) in the telephoto area, the drive member 27 holding the sub optical system 4 causes the drive member 27 holding the sub optical system 4 to move in the first flat section A of the front cam 26a. Is engaged with the cam surface of the first slope section B beyond the end point θ ₁ , and the front cam 26s displaces the drive member 27 in the optical axis direction against the biasing force of the spring 30. The displacement in the optical axis direction is due to the cam 26a rotating clockwise from the state shown in FIG. 6 and pushing up the sliding contact portion 27c of the drive member 27 in the first slope section B.

By the movement of the driving member 27 in the optical axis direction, the small cylinder 4c (see FIG. 1) holding the sub optical system 4 comes out from the opening 10a of the base plate 10, so that the driving member 27 is
It is possible to swing in the direction crossing the optical axis. Therefore, as the motor 12 continues to rotate, the drive member 27 is pushed by the upper cam surface of the first slope section B and rotates clockwise with the cam gear 26 in FIG. At this time, since the drive member 27 is constantly biased toward the base plate 10 by the spring 30, the end surface of the small cylinder 4c moves while sliding on the back surface of the base plate 10.

When the drive member 27 rotates clockwise with the front cam 26a by the angle α in FIG. 10, the free end 27d of the drive member 27 abuts on the locking member 10k and its rotation is blocked. Since the cam gear 26 continues to rotate together with the motor 12 after that, the drive member 27 climbs up the first slope section B of the front cam 26a and goes beyond the second flat section C to the second slope section C.
Slide down slope section D. By the lowering of the drive member 27, the small cylinder 4c is inserted into the circular hole 10l of the base plate 10, and the sub optical system is fixed at this retracted position (see FIG. 2).

The second slope section D with which the driving member 27 engages
When it enters into the first flat portion A of the front cam 26a beyond the point, the main optical system 3 reaches the close-up position at the engagement point P in FIG. 11, the switch Sw3 is turned off, and the above-mentioned first path is changed. When cut off, the motor 12 stops. At that time, since the switch Sw5 is turned on, the motor 12
Is controlled by the automatic focus adjustment / shutter control circuit 31 through the third path, and the main optical system 3 can be moved from the close-up position to the infinity position in the wide-angle range. However, the relative movement of the front cam 26a with respect to the drive member 27 is as shown in FIG.
Since it is limited to the wide-angle focus adjustment section W between points P and Q in the first flat section A, the sub optical system 4 does not move from the retracted position.

[3] When the focal length selection member 105 moves from the wide angle position to the OFF position. From the wide-angle position shown in FIG. 4 to the focal length selection member 105 shown in FIG.
When it is rotationally displaced to the OFF position as shown in, the crank lever 116 is interlocked with the focal length selection member 105.
Rotates counterclockwise in FIG. 14 and slides the slide plate 119 to the left. By sliding this slide plate 119,
As shown in FIG. 15C, the protruding cam 121 moves from the position of the chain line of the swing lever 113 close to the track L to the track L.
Move to the left to the position of the solid line that crosses. This protruding cam 1
With the movement of 21, the swing lever 113 moves the protruding cam 1
It is pressed by the left side surface 121b of 21 to be displaced leftward to the position indicated by the solid line (displaced counterclockwise in FIG. 14).

In FIG. 14, the protruding cam 121 moves to the left, and resists the urging force of the tension spring 112 to cause the swing lever 1 to move.
When 13 is displaced counterclockwise, the flange 108 rotates counterclockwise via the transmission shaft 107. Since the pin 110 turns counterclockwise in response to the counterclockwise rotation of the flange 108, the crank lever 103 biased counterclockwise by the coil torsion spring 109 follows the pin 110 in the counterclockwise direction. Turn to. Also,
Since the other crank lever 104, which is connected to the crank lever 103 via the pin 105, rotates clockwise, the two shield plates 102A of the dust cover 102 supported by the two crank levers 103 and 104 are 102
The Bs move toward each other, and are united on the front surface of the main optical system 3 to complete the closing operation of the dustproof cover 102.

On the other hand, when the focal length selection member 105 moves to the OFF position, the sliding contact pieces Br1 and Br2 of the switches Sw1 and Sw2 are separated from the conductor lands Cd1 and Cd2, respectively, as shown in FIG. Both Sw2 are turned off. Therefore,
The input terminals 40a and 40b of the logic circuit 40 are both at the Low level. Therefore, the exclusive or circuit 40e
The output terminal of the logic circuit 40 is maintained at the High level and the output terminals of the logic circuit 40 are maintained at the High level and the Low level, respectively. This causes the switch Sw shown in FIG.
7a and Sw7b are on, and switches Sw8a and Sw8b are off. However, the main optical system 3 is already in the retracted position (wide-angle region), and the switches Sw3, Sw4, Sw are
5 is in the OFF, ON, and ON states, respectively. Therefore, the above-mentioned first path and second path for supplying power to the motor 12
Since the path is cut off, the motor 12 is not rotated in either forward or reverse directions. In addition, since the switch Sw1a which operates in the same phase as the switch Sw1 is also placed in the OFF state, the power supply to the automatic focus adjustment / shutter control circuit 31 is cut off, and the shutter is inoperative as well as the focus adjustment, and the shutter release button is pressed. However, the shutter is locked so that shooting is not possible.

[4] When the focal length selection member 105 is switched from the telephoto position to the OFF position beyond the wide angle position. As shown in FIG. 15D, the focal length selection member 105
When rotating from the telephoto position (position of symbol T) to the OFF position directly beyond the position of symbol W, this focal length selection member 1
In association with 05, the protruding cam 121 moves from the position of the chain line outside the track L of the swing lever 113 to the position of the solid line in the track L. However, the moving lever 113 still has the protruding cam 1.
Since it is at the position (1) apart from 21, the dust cover 1
02 is placed in an open state.

On the other hand, when the focal length selection member 105 is rotated from the telephoto position to the OFF position, the switches Sw1 and Sw2 are switched from the ON state shown in FIG. 6 to the OFF state shown in FIG.
Both can be switched to the state. Switches Sw1 and S
When w2 is turned off, both the input terminals 40a and 40b of the logic circuit 40 become Lo as described in [3].
Since it becomes the w level, the output terminals 40a and 40b are converted to the High level and the Low level, respectively. As a result, the switches Sw7a and Sw7b in FIG.
w8a and Sw8b are turned off.

On the other hand, in this state, the main optical system 3 and the sub optical system 4 are combined and are in the extended position (telephoto region) as shown in FIG. 1, and the switches Sw3, Sw4, Sw5 are shown in FIG.
It is placed in the ON, OFF, and ON states as shown in.
Therefore, as described in [2], the motor 12 is supplied with power by the first path described above, and the rotation of the motor 12 moves the base plate 10 toward the retracted position (wide-angle region), and at the same time, The sub optical system 4 is moved to the retracted position as shown in FIG.

A swing lever 113 for opening and closing the dustproof cover while the base plate 10 moves toward the retracted position.
Is a cam 121 that protrudes on the track L in accordance with the movement of the base plate 10.
Move towards. The swing lever 113 is shown in FIG.
When the position (2) shown in [d] is reached, the protruding cam 121
Of the inclined cam surface 121a, and is engaged with the left side surface of the protruding cam 121 at the position (3) displaced leftward from the track L to stop the movement of the base plate 10 to the retracted position. . By the displacement of the swing lever 113 to the left,
As shown in FIGS. 2 and 5, the dustproof cover 102 is automatically covered with the movement of the main optical system 3 to the retracted position. Therefore, when storing the camera, there is no risk of forgetting to close the dustproof cover. Also, the switch Sw1
Since the switch Sw1a is also turned off when the camera is turned off, it is possible to prevent the shutter from inadvertently operating when the camera is stored.

[5] When the focal length selection member 105 is switched from the OFF position to the wide angle position. In this case, contrary to the operation already described in [3], FIG.
In [c], the protruding cam 121 moves to the right from the position indicated by the solid line to the position indicated by the chain line, and in accordance with the movement of the protruding cam 121, the swing lever 113 is displaced rightward to the position of the track L. Return. Therefore, in FIG. 14, the swing lever 113 is returned to rotate clockwise and the dust cover 102 is opened via the crank levers 103 and 104.

On the other hand, in this state, since the switch Sw1 is turned on as shown in FIG. 7, the motor 12 is supplied with electric power by the above-mentioned third path, and the rotation of the motor 12 causes the main optical system 3 to move in the wide-angle range. Then, it is moved to adjust the focus and you can shoot. [5] When the focal length selection member 105 is switched from the wide-angle position to the telephoto position.

When the focal length selection member 105 is switched from the wide-angle position (position of symbol W) to the telephoto position (position of symbol T), the projecting cam 121, as shown in FIG. Although it moves from the position to the position of the chain line on the right side, the swing lever 113 is not moved by this. Therefore, the dustproof cover 102 is left open.

When the focal length selection member 105 is switched to the telephoto position, the switch Sw is switched as shown in FIG.
Since both 1 and Sw2 are turned on, the input terminals 40a and 40b of the logic circuit 40 are both at the high level. Exclusive or circuit 40e, knob circuit 40
Since the output terminals of f are both at the Low level, the output terminal of the OF circuit 40g is inverted to the Low level, and the logic circuit 4
0 output terminals 40c and 40d are Low and High, respectively.
Invert to h 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 above-mentioned 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.

Until the small cylinder 4c (see FIG. 2) holding the sub-optical system 4 is ejected from the circular hole 10l provided in the base plate 10 by the rotation of the motor 12, the sub-optical system 4 is kept at the retracted position. It is displaced along the optical axis. This displacement in the optical axis direction occurs when the front cam 26a rotates counterclockwise in FIG.
This is because the drive member 27 is pushed up in the slope section D. When the small cylinder 4c escapes from the circular hole 101, the driving member 27 is pushed by the upper portion of the second slope section D and rotates counterclockwise in FIG. 10 by the angle α. When the sub optical system 4 is located on the optical axis of the main optical system 3, the driving member 27
The free end 27d comes into contact with the locking member 10j to prevent rotation. Due to the subsequent rotation of the front cam 26a, the drive member 27 moves up the second slope section D, and when the second flat section C is further passed, slides down the first slope section B. At that time, the driving member 27 moves in the optical axis direction along the pin 10j, so that the small cylinder 4e for holding the sub optical system 4 is fitted into the opening 10a of the base plate 10 as shown in FIG. The movement to the insertion position of 4 is completed.

On the other hand, when the base plate 10 supporting the main optical system 3 is extended and reaches the close-up position in the wide-angle region (the position of the engagement point P in the first flat section A in the front cam 26a), the switch Sw3 is turned on. When the switch 10 is turned on and the base plate 10 is further extended to reach the infinite position in the telephoto area (the position of the engagement point S in the first flat section A in the front cam 26a), the switch Sw4 is turned off. The second path is cut off and the motor 12 stops rotating. After that, the automatic focus adjustment / shutter control circuit 31 reaches the closest position (the position of the engagement point R in the first flat section A in the front cam 26a).
The base plate 10 is fed out under the control of and is stopped at the position shown in FIG. When the base plate 10 is in the telephoto area, as shown in FIG.
Since the rocking lever 113 is on the track L as shown in FIG. 5A, the dustproof cover 102 is maintained in the open state as shown in FIG.

[7] When the focal length selection member 105 is switched from the OFF position to the telephoto position. In this case, first, the protruding cam 121 of the slide plate 119
Is displaced to the right from the position indicated by the solid line in FIG. 15C to a position largely separated from the orbit of the rocking lever 113 as shown in FIG. 15A, the rocking lever 113 follows this. And moves to the right and is located on the orbit L. Therefore,
The dustproof cover 12 is immediately opened.

On the other hand, when the focal length selection member 105 is switched from the OFF position to the telephoto position, the switches Sw1 and Sw2 are both switched from the OFF state to the ON state. Therefore, when the main optical system 3 is switched from the wide-angle position to the telephoto position in the same manner as in [6], the sub-optical system 4 is inserted on the optical axis of the trace of the main optical system 3. It

In the first embodiment shown in FIGS. 1 to 15, the dustproof cover 102 moves in the optical axis direction together with the base plate 10 holding the main optical system 3. However, the dustproof cover 102 may be configured so as not to move in the optical axis direction like a known dustproof cover.
16 and 17 are cross-sectional views of a second embodiment in which the dustproof cover 102 covering the front surface of the main optical system 3 does not move in the optical axis direction, and FIG. 18 is a perspective view showing the configuration of the main part thereof. is there. Members having the same functions as those in the first embodiment are designated by the same reference numerals as those in the first embodiment, and detailed description of the configuration thereof will be omitted.

FIG. 16 shows a telephoto state in which the main optical system 3 is extended, and FIG. 17 shows a state in which the dustproof cover 102 is closed in a wide-angle state in which the main optical system 3 is extended.
Further, FIG. 18 shows a configuration of a main part of the present invention in the telephoto state shown in FIG. 16 and 17,
The dust-proof cover 102 is provided between the front fixing portion 1a and the front lid portion 1f of the camera body 1, and the taking lens barrel 3c that holds the main optical system 3 has the front fixing portion 1e and the front lid portion 1c.
The openings 1g and 1h respectively provided in f are configured to be able to penetrate.

In FIG. 18, shafts 101A 'and 10 supporting the light shielding plates 102A and 102B of the dustproof cover 12 are shown.
1B 'is formed to be much shorter than the shafts 101A and 101B in FIG. Further, the transmission shaft 207 having the flange 108 fixedly provided at one end is used as the front fixing portion 1 of the camera body 1.
The oscillating lever 113 'is rotatably supported by e and is rotatably supported by the base plate 10, and extends long through the center of rotation of the swing lever 113'. The swing lever 113 'is provided on the transmission shaft 10
7'is engaged with an axially long key groove 107'a, rotates integrally with the transmission shaft 107 ', and is slidable along the transmission shaft 107'.
The members in FIG. 18 other than 1′A, 101′B, the transmission shaft 107 ′ and the swing lever 113 ′ are configured in exactly the same manner as those in FIG.

Therefore, when the focal length selection member 105A is switched from the telephoto position (position of symbol T) to the OFF position,
Similar to the operation [4] in the first embodiment, the protruding cam 121 of the slide plate 119 is immediately inserted on the orbit of the swing lever 113 ′ as in FIG. In this state, the rotation of the motor 12 causes the base plate 10 to move to the position shown in FIG.
When it is retracted rightward, the swing lever 113 ′ slides rightward on the transmission shaft 107. This swing lever 113 '
When it reaches the position (2) in FIG. 15D, it engages with the protruding cam 121 and is displaced leftward from the track L along the inclined cam surface 121a. The displacement of the sliding lever 113 ′ to the left, that is, the counterclockwise displacement in FIG. 18, causes the transmission shaft 107 ′ to rotate counterclockwise in the flange 108.
Tell. Therefore, the flange 105 rotates counterclockwise, and the light shielding plate 10 is moved through the crank levers 103 and 104.
2A and 102B are moved toward each other.

Since the dustproof cover 102 begins to close before the taking lens barrel 3c has passed through the opening 1h of the front lid portion 1f, the light blocking plates 102A and 102B come into contact with the taking lens barrel 3c and the crank levers 103, 104. Stops rotating. In this case, the pin 110 rotating counterclockwise together with the flange 108 is separated from the crank lever 103, and the biasing force of the coil torsion spring 109 is only slightly strengthened.
And 102B are placed in contact with the taking lens barrel 3c.

The taking lens barrel 3c passes through the opening 1h,
When separated from the contact position between the outer periphery and the light shielding plates 102A and 102B, the light shielding plates 102A and 102B move in the direction in which they are in contact with each other by the biasing force of the coil torsion spring 109, and the dustproof cover 102 is immediately closed. Further, the sub optical system 4 moves to the retracted position in exactly the same way as in the first embodiment,
The camera is stored.

When the focal length selection member 105 is switched from the OFF position to the wide-angle position (position of symbol W) or the telephoto position (position of symbol T), first, the slide plate 119 is moved as in the first embodiment. Moves to the right and the protruding cam 121
Moves to the position of the solid line or the position of the chain line in FIG. Following this movement, the swing lever 113 'is rotated clockwise by the biasing force of the tension spring 112 as shown in FIG. Further, the rotation of the rocking lever 113 'is transmitted by the transmission shaft 10
7 ′ to the flange 108 and the flange 10
8 rotates clockwise. Therefore, the dust cover 102 is opened.

At the time of focus adjustment and focal length switching,
The base plate 10 is moved in the optical axis direction by the rotation of the motor 12. However, in this case, since the dustproof cover 102 is already in the open state and the swing lever 113 ′ only moves on the transmission shaft 107 ′ without rotating, the taking lens barrel 3e and the dustproof cover 102 are There is no fear of interference.

In the second embodiment shown in FIG. 18, the dustproof cover 102 is left fixed, and the taking lens barrel 3c can be formed to have a small diameter. Therefore, in the second embodiment, the camera can be made more compact than in the first embodiment. Figure 14 above
In order to avoid mutual interference between the crank lever 103 and the transmission shafts 107, 107 'of the dustproof cover opening / closing mechanism shown in FIG. 18, when the light blocking plates 101A, 101B, 101A', 101B 'are closed. , Flange 105,
A coil torsion spring 109 and a bin 110 are provided. However, when the slide plate is provided with a tension spring that is stronger than the urging force of the tension spring 112 that gives the swinging lever 113 a clockwise habit, the slides 119 and 119 move when the focal length selection member 105 moves to the OFF position. If the oscillating lever 113 is configured to rotate counterclockwise by being displaced leftward by the tension spring, the above-mentioned flange 1
The crank lever 103 can be directly coupled to the transmission shafts 107 and 107 ′ except for 05 and the like. FIG. 19 shows FIG.
4 the crank lever 103 to the crank lever 10
FIG. 9 is a perspective view showing a main part of a third embodiment of the present invention in which the slide plate 119 ′ is directly connected to No. 3 and is biased by a tension spring 122 so as to be displaced leftward. The left side surface of the upper projecting portion 119'A of the slide plate 119 'is biased by the tension spring 122 so as to be constantly in pressure contact with the engagement pin 117, and the rotation of the crank lever 115 supporting the engagement pin is caused by the focal length. The tip of the click spring 124 is configured to be blocked by dropping into the click groove 123A provided on the outer periphery of the rotary plate 123 that is interlocked with the selection member 105. Further, the three click grooves 123A are provided corresponding to the telephoto position (T), the wide-angle position (W), and the OFF position where the focal length selection member 105 is moved and set. Since the other members are the same as those in the first embodiment of FIG. 14, the same reference numerals are given and the description of the configuration is omitted. Note that FIG. 19 shows a state in which the focal length selection member 105 is in the telephoto position (T) and the main lens 3 and the base plate 10 are in the extended position, as in FIG.

In FIG. 19, the focal length selection member 105.
When is switched from the telephoto position (T) directly to the OFF position,
Since the crank lever 117 rotates counterclockwise, the engagement pin 117 is displaced leftward in FIG. Therefore, the slide plate 119 'is displaced leftward by following the engagement pin 117 by the urging force of the tension spring 122, and is inserted on the track L of the swing lever 113 as shown in FIG. On the other hand, the swing lever 113 that is in the feeding position together with the base plate 10
Moves along the track L toward the retracted position, it abuts on the cam surface 121a of the protruding cam 121, and the cam surface 121a
Press a. At this time, since the tension spring 112 that biases the swing lever 113 has a weaker biasing force than the tension spring 112 that biases the slide plate 119 ′, the swing lever 113
Rotates counterclockwise in FIG. 19 against the urging force of the tension spring 112, and moves along the cam surface 121a.
By the counterclockwise rotation of the swing lever 113, the crank lever 103 rotates counterclockwise and the light shielding plate 102
A is displaced, and the other crank lever 104 interlocked with the crank lever 103 is rotated clockwise to displace the other light shielding plate 101B, and the dust cover 102 is closed. After the re-light-shielding plates 101A and 101B are brought into contact with each other and closed, and when the swing lever 113 further moves in the retracting direction, the swing lever 113 immediately detects the light-shielding plate 101.
Since the counterclockwise rotation is blocked by A and 101B, the cam surface 121a is pressed to the right and the tension spring 1
The slide plate 119 'is displaced to the right against the biasing force of the rod 22, contacts the left side surface 121b of the protruding cam 121, and reaches the retracted position. In this case, the upper protruding portion 119′A of the slide plate 119 ′ is separated from the engagement pin 117, but the focal length selection member 105 is O by the click stop means including the click spring 124 and the click groove 123A.
It is kept stopped at the FF position. Although not shown, this click stop device is also provided in the first embodiment of FIG. 14 and the second embodiment of FIG. Figure 1 above
In the ninth embodiment, since the transmission shaft 107 is directly connected to the crank cam 114, the cover opening / closing mechanism is simplified, which is convenient when the cover shaft is installed in a narrow space as in the second embodiment (FIG. 16). .

Each of the above embodiments relates to the dustproof cover of the bifocal camera, and the focal length selecting member 1
When the cam means (projecting cam 121) that is displaced in association with the switching operation of 05 is provided and the focal length selection member is switched from the OFF position to the wide-angle position or the telephoto position, the main optical system 3 is moved prior to the movement. When the cam means is displaced to open the dustproof cover 102 and the focal length selection member 105 is switched from the telephoto position to the OFF position, the protruding cam 121
After the displacement, the dust-proof cover is closed by using the long moving distance of the main optical system and the cam surface 121a of the protruding cam 121. Therefore, this dustproof cover device
Even for a camera capable of macro shooting that is extended far beyond the close range position of the normal shooting area and the focus is on the subject at a certain distance within the predetermined macro area, only the following simple changes are required. Can be applied at.

That is, the length of the conductor land 20b is set so that the switch Sw4 shown in FIG. 9 is turned off when the main optical system 3 focuses on an object located at a predetermined distance in the macro area. It suffices that the automatic focus adjustment circuit 31A is inoperative and only the shutter control circuit 31B is activated when the switch Sw4 is OFF. In FIG. 6, the focal length selection member 105 is renamed as a photographing area selection member, and the switching position and the telephoto position symbol T of the focal length selection member 105 are changed to the symbol M representing the macro region, and the wide angle is changed. It suffices to change the position symbol W to the symbol A that is representative of automatic focus adjustment in the normal shooting area.

Further, in the above-mentioned first and second embodiments, the dustproof cover 102 is composed of two light shielding plates 102A and 102B which move in opposite directions. However, if the dust-proof cover 102 has a sufficient accommodation space, it may be constructed by one sheet. Furthermore, in the above embodiment, the swing lever (cover opening / closing member) 1
As shown in FIG. 15D, reference numeral 13 is configured to be engaged with the cam surface 121a of the protruding cam 121 and displaced only when the focal length selection member (operation member) 105 is switched from the telephoto position to the OFF position. There is. However, its cam surface 1
21a is extended toward the left side surface 121b to eliminate the left side surface so that the swing lever (cover opening / closing member) engages with the extended cam surface when the focal length selection member (operation member) 105 is in the OFF position. You may In this case, when the main optical system 3 is at the infinity position, the swing lever 113
Is further displaced leftward from the position shown in FIG. 15C by the extended cam surface. However, the crank lever 103
It does not matter that the pin 110 in contact with is only slightly displaced in the counterclockwise direction in FIG. 10 and the dustproof cover 102 is left in the closed state as it is.

[0071]

As described above, according to the present invention, the cover opening / closing member for opening / closing the dustproof cover 102 moves in the optical axis direction along with the photographing optical system, and the engaging means is displaced according to the operation of the operating member. The dust-proof cover is configured to be opened and closed by the so that the taking lens barrel is housed inside the camera body when carrying the camera, making it extremely compact and not only detecting the taking lens barrel from the position. When moving to the retracted position, the dustproof cover is automatically closed to cover the front surface of the taking lens, so that the taking lens is safely protected. When the shooting lens is extended, the dustproof cover is opened in conjunction with the operating member prior to moving the shooting lens,
There is no risk of the dust cover and the shooting lens interfering with each other, and the cover opening / closing member and the engaging means can be placed at positions greatly separated from each other when the shooting lens is in the extended position, so the opening / closing mechanism of the dust cover is structured. Has the advantage of being simple and compact.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a first embodiment of the present invention applied to a bifocal camera, showing a selected state in which a main optical system and a sub optical system are combined.

FIG. 2 is a cross-sectional view of a first embodiment of the present invention applied to a bifocal camera, showing a housed state in which a dustproof cover is closed after the sub optical system is moved to a retracted position.

FIG. 3 is an external perspective view of FIG.

FIG. 4 is an external perspective view of the focal length selection member of FIG. 3 placed in a wide-angle position.

5 is an external perspective view showing a state in which the focal length selection member of FIG. 3 is placed in an OFF position.

FIG. 6 is a plan view in which the upper portion of FIG. 3 is partially cut away.

FIG. 7 is a plan view in which the upper portions of FIGS. 4 and 5 are partially cut away.

FIG. 8 is a plan view in which the upper portions of FIGS. 4 and 5 are partially cut away.

9 is a perspective view of a displacement mechanism of the main optical system of the embodiment shown in FIG.

FIG. 10 is a perspective view of the base plate in FIG. 9 viewed from the back.

11 is a cam diagram of the front cam in FIG.

FIG. 12 is a circuit diagram of an optical system driving motor control circuit used in the embodiment of FIG.

FIG. 13 is a logic circuit diagram in FIG.

FIG. 14 is a perspective view showing a configuration of a dustproof cover opening / closing mechanism which is a main part of the first embodiment of the present invention shown in FIG.

15A and 15B are explanatory views showing the relationship between the protruding cam and the swing lever in FIG. 14, where [a] is the state when the focal length selection member is in the telephoto position, and [b] is the focal length selection. The state when the member is switched to the wide angle position, [c] is the state when the focal length selection member is displaced to the OFF position, and [d] is the state when the focal length selection member is switched from the OFF position to the telephoto position. Indicates.

FIG. 16 is a cross-sectional view of a second embodiment of the present invention applied to a bifocal camera, showing a telephoto state in which a main optical system and a sub optical system are combined.

FIG. 17 is a cross-sectional view of a second embodiment of the present invention applied to a bifocal camera, showing a housed state in which the dustproof cover is closed after the sub optical system is moved to the retracted position.

FIG. 18 is a perspective view showing a dust cover opening / closing mechanism which is a main part of the first embodiment of the present invention shown in FIG. 16;

FIG. 19 is a perspective view showing an embodiment of a dustproof cover opening / closing mechanism different from FIGS. 14 and 15.

[Explanation of symbols]

 3 Main optical system (photographing lens) 4 Sub optical system 3A, 3C Photographic lens barrel 10 Base plate 12 Motor 102 Dust cover 103, 104 Crank lever 105 Focal distance selection member (operation member) 107 Transmission shaft 113 Swing lever (cover) Opening / closing member) 119 Slide plate (engaging means) 121 Projecting cam (engaging means)

[Procedure amendment]

[Submission date] December 10, 1993

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

However, in the camera having the conventionally known dustproof cover device, the motor rotates the lens barrel to drive the lens from the retracted position to the retracted position, but moves the lens from the retracted position to the retracted position. The reason is not the motor but the elastic force of the spring charged by the rotation of the lens barrel when driven from the retracted position to the extended position. The lens barrel is rotated by the elastic force of the spring to move the lens from the extended position to the storage position, and at that time, the dust cover is closed in conjunction with the rotation of the lens barrel. The dustproof cover closed by the spring is composed of two covers, and is kept in the closed position by the biasing force of the spring biasing in the closing direction and the contact between the two covers that stop the biasing force. Was there.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

[0005]

SUMMARY OF THE INVENTION The present invention solves the drawbacks of the camera having the above-mentioned conventional dustproof cover device, and the driving force of the electric drive means for electrically driving the taking lens moves the dustproof cover to the closed position. An object is to provide a camera that can move.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

In order to achieve the above object, according to the present invention, a camera having a camera body and a taking lens barrel movable in the optical axis direction at least between the extended position and the extended position. A lens electric drive means for electrically driving the photographing lens barrel from the extended position to the retracted position, and a closed position arranged inside the camera body and covering the front surface of the photographing lens barrel in a plane substantially perpendicular to the optical axis direction. A lens cover movable between an open position retracted from the front surface of the taking lens barrel, and a transmission means for moving the lens cover from the open position to the closed position by transmitting the driving force of the lens electric drive means. It is configured to have.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0071

[Correction method] Change

[Correction content]

[0071]

As described above, according to the present invention, when the camera is carried, the taking lens barrel is housed in the camera body so that it is extremely compact, and the taking lens barrel is detected by electric drive. When moving from the position to the retracted position, the dust-proof cover is automatically closed by the driving force of the electric drive means to cover the front surface of the taking lens, so that the taking lens is safely protected.

Claims (1)

[Claims] 1. A camera having a camera body and a photographic lens barrel movable in the optical axis direction at least between the extended position and the retracted position, wherein the photographic lens barrel is formed between the extended position and the extended position. A lens driving means for driving in both directions between them, a closed position which is arranged inside the camera body and covers the front surface of the taking lens barrel in a plane substantially perpendicular to the optical axis direction, and an opening for retracting from the front surface of the taking lens barrel. A camera comprising: a lens cover movable between a position and a power transmission means for transmitting a driving force of the lens driving means to drive the lens cover from an open position to a closed position.