JPH0827480B2 - camera - Google Patents

Description

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

[Background of the Invention]

A protective cover (hereinafter referred to as "dustproof cover") that protects the taking lens from damage caused by contact with an external object and prevents adhesion of dust, fingerprints, etc. is provided so as to open and close so as to cover the front surface of the taking lens. The device described in Japanese Patent Laid-Open No. 57-
It is already known, for example, from the published patent publication of 196222. This conventionally known protective cover device can move the taking lens through the dustproof cover in the opened state, and also moves the taking lens when the taking lens is retracted and moves to the storage position. 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 protective 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 protective cover device, a locking claw for holding the dustproof cover in the open position,
In order to move the photographing lens to the storage position, the distance adjusting member is released, and at the same time, the operating member for releasing the locking of the locking claw is required. Therefore, the device has a complicated structure,
It has the drawback of being costly.

Further, in this known protective 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. In a camera such as a possible camera in which the take-out amount of the taking lens is particularly large, the distance adjusting member and the cover driving ring are extremely separated from each other. Therefore, not only does the length of the charge arm for transmitting the rotation of the distance adjusting member to the cover driving ring become longer, but also the operating member for releasing the locking claws for locking the distance adjusting member and the cover driving ring respectively. The pressing portion must be extended for a long time, and the operation may not be smooth.

In this known protective cover device, the cover drive ring and the distance adjusting member are each rotated by the urging force of a spring to close the dustproof cover or move the taking lens in the retracting direction. for that reason,
Prior to photographing, the spring must be charged and the dustproof cover must be opened and the photographing lens must be moved to the extended position each time.

[Purpose of the present invention]

In a camera having a photographing lens barrel that is movable in the optical axis direction between the extended position and the retracted position, it is attempted to solve the above-mentioned drawbacks of the conventionally known protective cover device.
A lens cover formed of a single plate member that is movable between a closed position that covers the front surface of the taking lens and an open position that retracts from the front surface of the taking lens is provided in a plane that is substantially perpendicular to the optical axis direction. A structure in which the lens cover is opened and closed by moving the lens barrel of the taking lens is conceivable.

However, in such a structure, a space for accommodating the protective cover is required in the taking lens barrel that is movable in the optical axis direction, which leads to hindering the miniaturization of the camera.

Therefore, in the present invention, even if the lens cover is provided in the movable photographing lens barrel as described above, the lens barrel is downsized,
That is, it is an object of the present invention to provide a camera that does not hinder the downsizing of the camera.

[Outline of the present invention]

In order to achieve the above-mentioned object, the present invention provides a camera body having a camera body and a taking lens barrel movable in the optical axis direction at least between a retracted position and a retracted position. Between the lens driving means that drives in the axial direction and the closed position that covers the front surface of the taking lens and the open position that retracts from the front surface of the taking lens in a plane that is disposed inside the taking lens barrel and is substantially perpendicular to the optical axis direction. Movable,
A lens cover composed of a plurality of plate members, a first urging member for urging the lens cover toward the closed position, and a cover opening / closing member for urging the lens cover toward the open position, and the first urging member. A second urging member having a different urging force from the urging member, a restricting member for restricting the movement of the lens cover in the open position, movable along the optical axis direction together with the taking lens barrel, and opening and closing the lens cover by displacement. A cover opening / closing member, and a single engaging means arranged on the camera body side, which engages with the cover opening / closing member to open / close the lens cover by movement of the taking lens barrel. The technical point is to configure as described above.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are sectional views showing a first embodiment of the present invention to which a bifocal camera is applied. FIG. 1 shows a telephoto state in which a sub-optical system is added and a combined focal length is long, 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. Also,
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, and FIG. 5 is a perspective view of the embodiment in the stored state shown in FIG.

In FIGS. 1 and 3, a dustproof 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. It is provided so as to be openable and closable, and a sub optical system 4 is provided behind the main optical system 3 so that it can be inserted and removed. A focal length selection member 105 for switching the focal length of the photographing optical system and opening / closing the dustproof cover 102 is provided on the upper surface of the camera body 1 so as to be always operable. Dust cover 1
Reference numeral 02 is provided immediately before the main optical system 3 in the taking lens barrel 3A, and is placed in the open position in FIGS. 1 and 3. Further, the focal length selection member 105 is in the telephoto position in a state where the main optical system 3 is extended as shown in FIG. 3, and its mark 105A faces the symbol “T” attached to the upper surface of the camera body 1. ing. 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 is longer than the focal length of the main optical system 3. Has been switched to.

In FIG. 4, the indicator 105A of the focal length selection member 105 is shown.
Is opposed to the symbol "W" attached to the upper surface of the camera body 1, and in this case, the main optical system 3 is moved to the camera body 1 side together with the taking lens barrel 3A from the extended position in FIG. After moving to the retracted position, the sub optical system 4 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 short focus (wide angle).
Becomes However, the dustproof cover 102 is left open.

2 and 5, the focal length selection member 10 is shown.
The symbol 105A of 5 is a symbol "OF" attached to the upper surface of the camera body 1.
Facing the F ". In this state, the main optical system 3
Is at 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 until it is retracted out of the taking optical path. The dustproof cover 102 is the main optical system 3
It covers the front of and becomes a closed state.

6 and 8 are partially cutaway plan views of FIGS. 1 and 2, respectively, showing conductor lands C _d1 and C on the camera body side.
Sliding contacts B _r1 and B _r2 that come into contact with _d2 are interlocked with the focal length selection member 105, and are connected to a long strip-shaped conductor land C _d1 and sliding contacts.
The switch S _w1 is composed of B _r1 and the switch S _w2 is composed of the short conductor land C _d2 and the sliding contact B _r2 . Switch S
_{The w1} 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 _Sw2 is turned on only when the focal length selection member 105 is at the position of the telephoto symbol T, and is turned off at other wide-angle symbol W and OFF symbol positions. These two switches S _w1 and S _w2 control the rotation of a motor 12, which will be described later, in order to displace the main optical system 3 and the sub optical system 4. It should be noted that the photographic lens barrel 3A has a flange 3B on the outer circumference, and the focal length selection member 105 is switched to the wide-angle position (the position of the symbol W) so that the photographic lens barrel 3A repeats as shown in FIG. When the camera body 1 is retracted to the retracted position, the stepped portion 1a of the camera body 1 is filled with 3B to prevent dust and water droplets from entering the camera body when carrying the camera.

FIG. 9 is a perspective view showing an optical system displacement mechanism controlled by the focal length selection member 105, and FIG. 10 is a base plate 10 of FIG.
It is the perspective view which looked at from the back. Both show a telephoto state in which the main optical system 3 is at the extended position and the sub optical system 4 is inserted on the optical axis behind the main optical system 3 as shown in FIG.

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 in front of it an aperture / shutter device 11 and a main optical system 3 are provided as shown in FIG. It is fixed. A motor 12 is fixed to the upper back surface of the base plate 10, and a bevel gear 12a is fixed to one end of the rotation shaft of the motor 12 as shown in FIG. A bevel gear 13 pivotally supported by the base plate 10 is engaged with the bevel gear 12a, and a spur gear 13a integral with the gear 13 is engaged with a gear 14 also pivotally 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 onto the female screw. Guide shaft
15 extends in the optical axis direction, and the end is the substrate of the camera body
It is fixed to 1c, and its tip is axially slidably inserted into the through hole 10b of the base plate 10. A bevel gear 12b is fixed to the other end of the rotation shaft of the motor 12. A bevel gear 16 pivotally supported by the base plate 10 meshes with the bevel gear 12b,
The spur gear 16a integrated with 16 has a gear train 17 pivotally supported on the base plate 10.
The input gear 17a of is engaged. Output gear 1 of gear train 17
A through hole is formed in the center of 7b, and a female screw having the rotation center of the gear 17b as an axis is cut in 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 a through hole of the base plate 10.
It is inserted in 10c so that it can slide 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 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. Another guide shaft 19 extending in the optical axis direction is also planted in the substrate 1c. The guide shaft 19 is axially slidably inserted into the through hole 10e of the overhanging portion 10d and the through hole 10f of the base plate 10, which are provided on the back surface of the base plate 10, so that the base plate 10 has an optical axis. Held perpendicular to.

With this configuration, when the motor 12 rotates, the gear
The base plate 10 is parallelly moved in the optical axis direction while being perpendicular to the optical axis by the screwing of the guide shaft 15 and the screwing of the guide shaft 15 and the gear 17b, and the main optics fixed to it. The system 3 and the diaphragm / shutter device 11 are displaced in the optical axis direction between the feeding position and the feeding position.

A printed circuit board 20 is fixed to the right side surface of the base plate 10 in FIG. Conductor lands 20a to 20c are provided on the surface of the printed circuit board 20, and three sliding contact pieces 21 to 23 fixed to the camera body can be slidably contacted with the conductor lands 20a to 20c, respectively. Switch S is made up of sliding contact piece 21 and conductor land 20a.
w3, switch Sw4 with sliding contact piece 22 and conductor land 20b,
The sliding contact piece 23 and the conductor land 20c constitute a switch Sw5. The switch Sw3 is a switch Sw5 when the main optical system 3 is in the feeding position, and the switch SW4 is a switch Sw5 when it is in the feeding position.
Is OFF when it is between the feeding position and the feeding position. Switches Sw3 and Sw4 work as limit switches,
When the main optical system 3 is displaced to the feeding position or the feeding position, the power supply to the motor 12 is cut off. Switch Sw5 is the main optical system 3
Is a switch for preventing shutter release when a subject image cannot be formed on the film surface at an intermediate position between the above two positions, and the automatic focus adjustment / shutter control circuit 31 (first It is a switch for cutting off the power supply to (Fig. 12). The film 24 is provided behind the photographing opening 1d formed in the substrate 1c.

 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 axially supported on the back surface of the base plate 10, and the driving member 27
Holds the sub-optical system 4. The input gear 25a of the reduction gear train 25 meshes with the spur gear 13a integral with the bevel gear 13, and the final gear 25b of the reduction gear train 25 is the cam gear 26.
Are in mesh with each other. The cam gear 26 and the drive member 27 are coaxial, and both are front cams provided on the end surface of the cam gear 26.
It is connected via 26a.

The reduction gear ratio of the reduction gear example 27 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) where the sub optical system 4 is inserted in the photographing light beam, and when the main optical system 3 is at the retracted position, the sub optical system 4 is placed at a retracted position (illustrated by a chain double-dashed 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
It is slidable on the fixed shaft 10g in the axial direction, and the compression spring 30
Is urged to come into pressure contact with the front cam 26a of the cam gear 26. Locking members 10j and 10k for locking the free end 27d of the driving member 27 are planted on the base plate 10.
Is a drive member 27 when the sub optical system 4 is brought to the insertion position.
The lock member 10k locks the swing of the drive member 27 when the sub optical system 4 is brought to the retracted position.

The front cam 26a of the cam gear 26, as shown by the thick line in the cam diagram of FIG. 11, has a first flat section A in which the lift does not change from 0 to θ1 and 0 to θ1, and θ1 to θ.
First, the head h increases linearly from 0 to h1 over 2
It comprises a slope section B, a second flat section C in which the lift h does not change at h1 from θ2 to θ3, and a second slope section D in which the lift h decreases linearly from h1 to 0 from θ3 to 360 °.

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. 2, and the small cylinder 4C protruding from the drive member 27 has a front opening 10a or a circular hole 10l (see FIGS. 1 and 2). (See FIG. 2), even if the front cam 26a rotates, the sub optical system 4 is fixedly placed at that position. Front cam 26
While the drive member 27 is engaged in the first slope section B and the second slope section D while a rotates forward or backward, the sub optical system 4 moves in the optical axis direction according to the cam lift. , Small tube
When 4C escapes from the opening 10a or the circular hole 10l, it is configured to rotate integrally with the cam gear 26 by an angle α as shown in FIG.

FIG. 12 controls the motor 12 for driving the base plate 10 for holding the taking lens barrel 3A having the main optical system 3 and the dustproof cover 2 built therein and the drive member 27 for holding the sub optical system 4. It is a motor control circuit diagram. In FIG. 12, the motor 12 is driven by the following three power supply circuits.

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

The second path is a path of the positive electrode of the power source E-the switch Sw4-the switch Sw8a-the motor 12-the switch Sw8b-the negative electrode of the power source E. When power is supplied through this path, the motor
12 rotates in the opposite direction to that of the first path, and the main optical system 3
Is displaced to the extension position and the sub optical system 4 is displaced 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 described later.

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

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 operating, and when the smoke adjustment is completed, the shutter control circuit 31B operates to open and close the aperture / shutter device 11. ing.
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 whose opening and closing is controlled in the same phase as the switch Sw1 (see FIG. 4), and the switch Sw5 is used when the main optical system 3 is in the extended position and the extended position (sub optical system). Only when 4 is at 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 Sw8b 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 40d. The input terminal 40a is between the switch Sw1 and the ground resistance, and the input terminal 40b is the switch.
The output terminal 40c is connected to the switch Sw7
a, the control terminal of Sw7b, the output terminal 40d is the above switch Sw8
It is connected to the control terminals of a and 8b respectively. Input terminal 4
0a becomes High level when the switch Sw1 is ON, and when the switch Sw1 is OFF, that is, the focal length selection member 105 is OFF.
Low level when in position. The input terminal 40b is at a high level when the switch Sw2 is ON, that is, when the focal length selection member 5 is in the telephoto position, and when the switch Sw2 is OFF, that is, the focal length selection member 105 is in the wide-angle position and OFF.
Low level when in position. Output terminal 40c is High
At the time of level, turn on both switches Sw7a and Sw7b, and set Low
Turn off both at level. When the output terminal 40d is at the high level, both the switches Sw8a and Sw8b are turned on, and when the output terminal 40d is at the low level, both are turned off.

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 position of the focal length selection member 105, the states of the switches Sw1 and Sw2 that switch depending on the position, the input terminals 40a and 40b of the logic circuit 40, the levels of the output terminals 40c and 40d, the switches Sw7a, Sw7b, 8a and Sw8b. And the relationship between the positions of the main optical system 3 and the sub optical system 4 are summarized.

FIG. 14 is a perspective view showing the structure 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 dustproof cover 102 is composed of two half-moon shaped shield plates 102A and 102B, and one arm 10 of two crank levers 103 and 104 via shafts 101A and 101B, respectively.
It is rotatably supported by 3a and 104a within a certain angle. A pin 106 is implanted in the other arm 103b of one crank lever 103, and this pin 106 engages with a sliding groove 104c provided in the other arm 104b of the other crank lever 104.

On the other hand, a flange 108 is fixedly provided at one end of a transmission shaft 107 rotatably supported by the base plate 10, and one crank lever 1
03 is rotatably held by this flange 108. Further, the crank lever 103 is biased by the coil screw spring 109 so as to rotate counterclockwise in FIG.
The other arm 103b is constantly in pressure contact with the pin 110 implanted in the flange 108. One crank lever 1 through pin 106
The other crank lever 104 coupled to 03 is rotatably supported by a pin shaft 111 planted on the base plate 10. Furthermore, a swing lever 113 biased clockwise by a tension spring 112 in FIG. 14 is fixedly attached to the other end of the transmission shaft 107 that penetrates the base plate 10. 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 performed by the eccentric pin 115 through the crank lever 11.
The engaging pin 117, which is transmitted to the arm 6 and is planted in the one arm 116a of the crank lever 116, is swung.
The engagement pin 117 engages with a groove 120 formed in an upper protruding portion 119A of a slide plate 119 supported by two guide pins 118 embedded in the camera body.

When the crank lever 116 rotates, the slide plate 119
It is configured to slide left and right in FIG. 14 in parallel with the base plate 10. A protruding cam 121 is provided below the slide plate 119 so as to protrude in the optical axis direction, and a cam surface 121a engageable with the swing lever 113 is formed at the tip of the protruding cam 121. This cam surface 121a is the focal length selection member 10
5 is rotationally displaced from the telephoto position to the OFF position, and slide plate 119
After moving to the left in FIG. 14, when the base plate 10 moves to the retracted position, it engages with the upper right side surface of the swing lever 113 to rotate the swing lever 113 counterclockwise. It is configured.

The positional relationship between the swing lever 113 and the protruding cam 121 is as follows.
As shown in the explanatory view of FIG. 15, the focal length selection member 105
When the is in the telephoto position, the swing lever 113
And the left side surface 121b of the protruding cam 121 is
The rocking lever 113 is placed away from the orbit L in the optical axis direction (see FIG. 15 [a]). When the focal length selection member 105 is switched to the wide-angle position as shown in FIG.
Moves from the broken line position to the solid line position along the track L as the base plate 10 moves, and the protruding cam 121 also moves from the chain line position to the solid line position. In this case, the left side surface 121b of the protruding cam 121
Is close to the orbit L of the rocking lever 113, but is not in contact with the rocking lever 113. Next 15th
When the focal length selection member 105 is placed in the OFF position as shown in FIG. [C], the protruding cam 121 is inserted from the position of the chain line onto the track L of the swing lever 113 as shown by the solid line, and the swing lever 113 projects. The cam 121 comes into contact with the left side surface 121b and is pushed and moved leftward to be placed at the solid line position. At this time, the swing lever 113 moves the 14th
It rotates counterclockwise in the figure, and the dustproof cover 102 is closed.
When the focal length selection member 105 is rapidly rotated from the telephoto position to the OFF position as shown in FIG. 15D, the protruding cam 121 immediately moves from the position shown in FIG. 15A to the position shown in FIG. 15C. . However, since the movement of the swing lever 113 that moves in the optical axis direction together with the base plate 10 is delayed, the swing lever 113 is (1)
From the position of to the position of (2) along the track L.
The rocking lever 113 is in contact with the cam surface 121a at 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. 15 [c]. Is configured to be.

 Next, the operation of the above embodiment will be described.

[1] When the focal length selection member 105 is in the telephoto position.

As shown in FIG. 3, when the focal length selection member 105 is placed at the telephoto position (the position of symbol T), the crank lever 116 interlocking with the focal length selection member 105 has the crank lever 116 shown in FIG. As shown in FIG. 14, the slide plate 119 is located at the clockwise rotation position and is moved to the rightmost side in FIG. Therefore the first
5 As shown in FIG. 5 (a), the protruding cam 121 of the slide plate 119 is placed at a position separated rightward from the track L of the swing lever 119.

The swing lever 119 is placed at a position rotationally displaced clockwise as shown in FIG. 14 by the urging force of the tension spring 112, and the crank lever 103 interlocked with this is prevented from rotating clockwise by the fixing pin 114. ing. In addition, the dustproof cover 10
The second shield plates 102A and 102B are in an open state 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, when the focal length selection member 105 is in the telephoto position (symbol T position) as shown in FIG.
Sliding contact piece Br ₁ and the sliding contact piece Br ₂ switches sw ₂ of Sw ₁ is respectively in contact with the conductor lands Cd _1, Cd _2. Therefore, since the switches Sw1 and Sw2 are both in the ON state, the input terminals 40a and 40b of the logic circuit 40 are both at the high level. The output terminals of the exclusive OR circuit 40e and the NOR circuit 40f are at Low level, the output terminal of the OR circuit 40g is at Low level, and the output terminals 40c and 40d of the logic circuit 40 are at Low level and High level, respectively. As a result, the switches Sw7a and Sw7b shown in FIG. 12 are
Is turned off, and switches Sw8a and Sw8b are turned on. Since the main optical system 3 is in the extended position, the switches Sw3, Sw4, Sw5 are in the ON, OFF, and ON states, respectively, as shown in FIG. Since the switches Sw7a and Sw7b are OFF, the above-mentioned first path for driving the motor 12 is not formed, and
Since the switch Sw ₄ is OFF, the above-mentioned second path is not formed.

In this case, the main optical system 3 is in the extended position, and the sub optical system 4
Is at the insertion position on the optical axis, a composite optical system is constructed by both optical systems, and the focal length thereof is in the telephoto range. Further, since the switches Sw1a and Sw5 are both ON, the automatic focus adjustment and 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, and the motor 12 is rotated by receiving power from the above-mentioned third path in response to the photographing start operation by pressing the shutter release button. The rotation of the motor 12 for focus adjustment in this telephoto region causes the gears 14 and 17b to rotate, and the base plate 10 together with the synthetic optical systems 3 and 4 follows the lead of the guide shafts 15 and 18 from the infinity position to the closest distance. It is extended to the position and automatic focusing is performed.

Further, the cam gear 26 also rotates via the reduction gear train 25 in accordance with the rotation of the motor 12 for focus adjustment. However, the front cam 26a engages the drive member holding the sub optical system 4 with the engagement point R (composite optical system 3, 4) in the first flat section A which is close to the first slope section B in FIG. Contacting and sliding are performed within the telephoto-side focus adjustment section t from the closest distance position of (1) to the engagement point s (corresponding to the infinity position of the combining optical systems 3 and 4). Therefore, the sub optical system 4 is neither moved in the optical axis direction nor 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 to form the base plate 10
At the same time, it is moved in the optical axis direction and focus adjustment is performed without any 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. 4, the crank lever 116 interlocked with the focal length selection member 15 moves to the 14th position. In the figure, it rotates counterclockwise to the intermediate position, and moves 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. Even if the base plate 10 moves to the retracted position, the swing lever 113 does not contact as shown by the solid line. Therefore, the swing lever 113 is moved to the same position as in FIG. 14 by the biasing force of the tension spring 112. Retained. Therefore, the dustproof cover 102 is left open.

On the other hand, when the switching from the telephoto position the focal length selecting member 105 to the wide angle position (position of the symbol W) (position of the symbol T), as shown in FIG. 7, the sliding contact piece Br ₂ switch Sw ₂ conductor lands Separation from Cd ₂ and disconnection. Therefore, the switch Sw2 is turned off, and the input terminal 40b of the logic circuit 40 shown in FIG. 9 becomes low level. Ikusuru-Shibuor circuit 40
Since the output terminal of e becomes High level, the output terminal of the OR circuit 40g is inverted to High level, and the output terminal 40 of the logic circuit 40
c and 40d are inverted to High and Low levels, respectively. As a result, the switches Sw7a and Sw7b shown in FIG. 12 are turned on and the switches Sw8a and Sw8b are turned off. However, the main optical system 3 is still
Since it is in the feeding position, as shown in FIG.
3, Sw4, Sw5 are in the ON, OFF, and ON states, respectively, and the switches Sw7a, Sw7b are in the ON state, so the power source E-Sw3-Sw7a-
The aforementioned first path consisting of the motor 12-Sw7b-power source E is formed, and the motor 12 is started. Therefore, the motor 12 rotates the gears 14 and 17b screwed with the guide shafts 15 and 18 in the counterclockwise direction in FIG. 10 to bring the main optical system 3 and the sub optical system 4 together with the base plate 10 into the retracted position. Move towards.

Base plate 10 to the infinity position in the telephoto area of the synthetic optical systems 3 and 4
Switch moves as soon as
4 is turned on and switch Sw5 is turned off.
When 0 reaches the close-up position in the wide-angle range, switch Sw3
The switch is turned off, and the switch Sw5 is turned on again.
When the switch Sw3 is turned off, the 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. 4 and 5. At this time, the swing lever 113 for opening and closing the dust cover 102 is provided on the left side surface 121 of the protruding cam 121 from the dotted line position as shown in FIG.
Move to the solid line position near b.

While the switch Sw5 is in the OFF state, that is, while the base plate 10 is moving beyond the telephoto area to the wide-angle area, the automatic focus adjustment / shutter control circuit 31 is in a non-operating state, so even if the shutter release button is pressed. , No focus adjustment is done. 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 from the insertion position on the optical axis of the main optical system 3 to the retracted position outside the optical axis to the front cam 26a of the cam gear 26. Moves according to the rotation of. Next, the movement process of the sub optical system 4 will be described.

The above-mentioned first path (power supply E-Sw3-Sw7a-motor 12-S
When the motor 12 starts rotating due to the formation of w7b-power source E), the cam gear 26 starts rotating clockwise in FIG. 6 through the reduction gear train 25. When the base plate 10 is slightly retracted beyond the infinity position (corresponding to the engagement point S in FIG. 11) in the telephoto area due to the rotation of the motor 12, the drive member 27 that holds the sub optical system 4 is 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 of
The front cam 26a resists the biasing force of the spring 30 and drives the drive member 27.
Is displaced in the optical axis direction. This optical axis displacement is
This is because 26a rotates clockwise from the state shown in FIG. 6 and pushes 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 sub optical system 4
Since the small cylinder 4c (see FIG. 1) holding the member escapes from the opening 10a of the base plate 10, the drive member 27 can 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 together with the cam gear 26 in FIG.
At this time, since the drive member 27 is constantly urged 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 along with the front cam 26a by an 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 moves up the first slope section B of the front cam 26a to the second
It slides down the second slope section D beyond the flat section C. By the lowering of the driving 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 (second
See figure).

When the drive member 27 enters the first flat portion A of the front cam 26a beyond the engaging second slope section D, the main optical system 3 reaches the close-up position at the engaging point P in FIG. Then, the switch Sw3 turns off and the above-mentioned first path is cut off.
12 stops. At that time, since the switch Sw5 is turned on, the motor 12 is thereafter controlled by the automatic focus adjustment / shutter control circuit 31 through the third path, and the main optical system 3 moves from the close-up position in the wide-angle range to the infinity position. It becomes movable. However, the relative movement of the front cam 26a with respect to the drive member 27 is limited to the wide-angle focus adjustment section W between points P and Q in the first flat section A in FIG. It never moves out of position.

[3] When the focal length selection member 105 moves from the wide-angle position to the OFF position.

When the focal length selection member 105 is rotationally displaced from the wide-angle position shown in FIG. 4 to the OFF position as shown in FIG.
14 Rotate counterclockwise in the figure and slide the slide plate 119 to the left. By sliding the slide plate 119, the protruding cam 1
As shown in FIG. 15 [C], 21 is a swing lever 113.
The vehicle moves leftward from the position indicated by the chain line near the start L of the vehicle to the position indicated by the solid line crossing the trajectory L. With the movement of the projecting cam 121, the swing lever 113 is pressed by the left side surface 121b of the projecting cam 121 and is displaced leftward to the position indicated by the solid line (displaced counterclockwise in FIG. 14).

In FIG. 14, when the protruding cam 121 moves to the left and the swing lever 113 is displaced counterclockwise against the biasing force of the tension spring 112, the flange 108 is rotated counterclockwise via the transmission shaft 107. Rotate to. 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 and counterclockwise. Rotate in the direction. Further, since the other crank lever 104, which is connected to the crank lever 103 via the pin 106, rotates in the clockwise direction, the two shield plates of the dust cover 102 supported by the two crank levers 103, 104. 102A and 102B move in the direction of approaching 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
As shown in FIG. 8, since they are separated from the conductor lands Cd1 and Cd2, respectively, both switches Sw1 and Sw2 are turned off. Therefore, the input terminals 40a and 40b of the logic circuit 40 are both Lo
w level. Therefore, the EXCLUS-SIBUOR circuit 40e
Output terminal is low level, output terminal of NOR circuit 40f is high
Since it becomes the level, the output terminals 40c and 40d of the logic circuit 40 are maintained at the High and Low levels, respectively. As a result, the switches Sw7a and Sw7b shown in FIG. 12 are turned on and the switch Sw8 is turned on.
a, Sw8b is OFF. However, the main optical system 3 is already in the retracted position (wide-angle region), and the switches Sw3, Sw4, Sw5
Are in the OFF, ON, and ON states, respectively. Therefore, motor 1
Since the above-mentioned first path and second path for supplying power to 2 are cut off, the motor 12 is not rotated in either forward or reverse directions. Also, a switch Sw1a that operates in phase with the switch Sw1
Is also set to the OFF state, the power supply to the automatic focus adjustment / shutter control circuit 31 is cut off, the shutter is inoperable as well as the focus adjustment, and shooting is impossible even if the shutter release button is pressed. The shutter is locked.

[4] When the focal length selection member 105 is switched from the telephoto position to the OFF position beyond the wide-angle position.

The focal length selection member 105 is, as shown in FIG.
When rotating from the telephoto position (position of symbol T) to the OFF position directly beyond the position of symbol W, the projecting cam 121 interlocks with the focal length selection member 105 and causes the protruding cam 121 to move in a chain line outside the track L of the swing lever 113. From the position, move to the position of the solid line in the trajectory L. However, since the swing lever 113 is still at the position (1) apart from the protruding cam 121, the dustproof cover 102 is placed in the open state.

On the other hand, when the focal length selection member 105 rotates from the telephoto position to the OFF position, the switches Sw1 and Sw2 are both switched from the ON state shown in FIG. 6 to the OFF state shown in FIG. When the switches Sw1 and Sw2 are turned off,
As described in [3], the input terminal 40 of the logic circuit 40
Since both a and 40b are at low level, output terminals 40c and 40d
Are converted to High and Low levels respectively. As a result, the switches Sw7a and Sw7b in FIG. 12 are turned on and the switches Sw8a and Sw8b are turned on.
Is turned off.

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

While the base plate 10 moves toward the retracted position, the swing lever 113 for opening and closing the dustproof cover moves on the track L toward the protruding cam 121 according to the movement of the base plate 10. When the oscillating lever 113 reaches the position (2) shown in FIG. 15 [d], the oscillating lever 113 moves along the inclined cam surface 121a of the protruding cam 121 and is displaced leftward from the track L (position (3)). Engages with the left side surface of the protruding cam 121 and stops when the movement of the base plate 10 to the retracted position stops. Due to the displacement of the swing lever 113 to the left, the dust cover 102 is moved to the position shown in FIG.
As shown in the figure, it is automatically covered in conjunction with the movement of the main optical system 3 to the retracted position. Therefore, when storing the camera, there is no fear of forgetting to close the dustproof cover.
Further, since the switch Sw1a is also turned off by turning off the switch Sw1, it is possible to prevent the shutter from accidentally 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, conversely to the operation already described in [3],
In FIG. 15C, 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 response to the movement of the protruding cam 121, the swing lever 113 is displaced to the right and the track L moves. Return to position. 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, as shown in FIG.
Is turned on, the motor is turned on by the third path described above.
12 is supplied with power, and the rotation of this motor 12 causes the main optical system 3
Is moved for focus adjustment in the wide-angle area, and can be photographed.

[6] 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 (the position of the symbol W) to the telephoto position (the position of the symbol T), the protruding cam 121 is moved to the position of the solid line close to the track L as shown in FIG. To the position indicated by the chain line to the right, but the swing lever 113 is not moved by this. Therefore, the dust-proof cover 102 is left open.

Also, when the focal length selection member 105 is switched to the telephoto position, both switches Sw1 and Sw2 are turned on as shown in FIG. 6, so that the input terminal 40 of the logic circuit 40 is turned on.
Both a and 40b are at high level. Since the output terminals of the equl-sive OR circuit 40e and the NOR circuit 40f are both at the Low level, the output terminal of the OR circuit 40g is inverted to the Low level,
The output terminals 40c and 40d of the logic circuit 40 are inverted to low and high levels, respectively. This causes the switch Sw7 shown in FIG.
a and Sw7b are turned off, and switches Sw8a and Sw8b are turned on.
Since the main optical system 3 is in the retracted position, the switches Sw3, Sw4,
Sw5 is in the OFF, ON, and ON states, respectively. Switch Sw
Since 8a and Sw8b are ON and the switch Sw4 is ON, the above-mentioned second path is formed, and the motor 12 starts to rotate in the direction opposite to that at the time of [2]. Therefore, the main optical system 3 starts to be displaced from the retracted position toward the extended position.

A small cylinder 4c that holds the sub optical system 4 by the rotation of the motor 12
The secondary optical system 4 is displaced in the optical axis direction at the retracted position until (see FIG. 2) escapes from the circular hole 10l provided in the base plate 10. This displacement in the optical axis direction is caused by the front cam 26a
This is because the drive member 27 is pushed up in the second slope section D by rotating counterclockwise in the figure. When the small cylinder 4c escapes from the circular hole 10l, the drive member 27 moves to the second slope section D.
It is pushed by the upper part of and rotates counterclockwise in FIG. 10 by an angle α. When the sub optical system 4 is located on the optical axis of the main optical system 3, the drive member 27 blocks its rotation by contacting the free end 27d of the drive member 27 with the locking member 10j. Continued front cam
By the rotation of 26a, the drive member 27 climbs up the second slope section D, and slides down the first slope section B after passing the second flat section C. At that time, the driving member 27 moves in the optical axis direction along the pin 10j, so that the small cylinder holding the sub optical system 4
4c is fitted into the opening 10a of the base plate 10 as shown in FIG. 1, and the movement of the sub optical system 4 to the insertion position 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 area (the position of the engagement point P in the first flat section A in the front cam 26a), the switch Sw3 is turned on.
Then, when the base plate 10 is further extended to reach the infinity 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, and The second path is broken and the motor 12 stops rotating. After that, it is at a very close distance position (the first on the front cam 26a
The base plate 10 is fed out under the control of the automatic focus adjustment / shutter control circuit 31 up to the position of the engagement point R in the flat section A) and stops at the position shown in FIG. When the base plate 10 is in the telephoto region, the swing lever 113 is on the track L as shown in FIG. 15 (a), so 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
Since the position shown by the solid line in FIG. 15C is displaced to the right from the position shown by the solid line in FIG. 15A to a position far away from the orbit of the swing lever 113, the swing lever 113 follows this. And moves to the right and is located on the orbit L. Therefore, the dust 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, both switches Sw1 and Sw2 are switched from the OFF state to the ON state. Accordingly, the main optical system 3 is extended exactly in the same manner as in the case of the switching from the wide-angle position to the telephoto position [6], and the sub-optical system 4 is inserted on the optical axis at the mark of the main optical system 3. You.

The first embodiment shown in FIGS. 1 to 15 is of a type in which 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 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.
FIG. 18 is a perspective view showing the configuration of the main part thereof. 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. Also, the 18th
The figure shows the structure of the main part of the present invention in the telephoto state shown in FIG. 16 and 17, the dustproof cover
Reference numeral 102 denotes a photographing lens barrel 3c that is provided between the front fixing portion 1e and the front lid portion 1f of the camera body 1 and that holds the main optical system 3.
The front fixing portion 1e and the front lid portion 1f are configured to be capable of penetrating the openings 1g and 1h, respectively.

In FIG. 18, shafts 101A ′ and 101B ′ that support the light shielding plates 102A and 102B of the dust cover 12 are the shafts 101A and 101B in FIG.
It is much shorter than 101B. Further, the transmission shaft 207 having the flange 108 fixed at one end is rotatably supported by the front fixing portion 1e of the camera body 1 and the rotation center of the swing lever 113 ′ rotatably supported by the base plate 10. Penetrates through and extends long. The swing lever 113 'engages with an axially long key groove 107'a formed in the transmission shaft 107', rotates integrally with the transmission shaft 107 ', and slides along the transmission shaft 107'. The shafts 101'A, 101'B are configured to be movable,
The members in FIG. 18 other than the transmission shaft 107 'and the swing lever 113' are constructed in exactly the same way as in FIG.

Therefore, when the focal length selection member 105A is switched from the telephoto position (position of symbol T) to the OFF position, the protruding cam 121 of the slide plate 119 is similar to the operation [4] in the first embodiment.
Is inserted into the orbit of the rocking lever 113 'as in FIG. 15 [d]. In this state, when the base plate 10 is retracted to the right in FIG. 16 by the rotation of the motor 12, the swing lever 113 'slides on the transmission shaft 107' to the right. When the swing lever 113 ′ reaches the position (2) in FIG. 15 [d], it engages with the protruding cam 121 and is displaced leftward from the track L along the inclined cam surface 121a. This sliding lever 11
The displacement of 3'to the left, that is, the counterclockwise displacement in FIG. 18, causes the transmission shaft 107 'to transmit the counterclockwise rotation to the flange 108. Therefore, the flange 108 rotates counterclockwise and moves the light shielding plates 102A and 102B through the crank levers 103 and 104 so as to approach each other.

Since the dust-proof cover 102 starts to close before the taking lens barrel 3c has passed through the opening 1h of the front cover 1f, the light-shielding plate 102A
And 102B contact the taking lens barrel 3c, and the crank levers 103 and 104 stop rotating. In this case, the flange 108
The pin 110 that rotates counterclockwise with the crank lever 1
By separating from 03, the biasing force of the coil torsion spring 109 is only slightly strengthened, and the light blocking plates 102A and 102B of the dustproof cover 102 are placed in contact with the taking lens barrel 3c.

When the taking lens barrel 3c passes through the opening 1h and moves away from the contact position between its outer periphery and the light blocking plates 102A and 102B, the light blocking plate 102A,
102B move in a direction in which they come into contact with each other by the urging 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, and the camera enters the retracted state.

Move the focal length selection member 105 from the OFF position to the wide-angle position (symbol W
Position) or the telephoto position (the position of symbol T), the slide plate 119 is first 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. 15 [b]. Following this movement, the swing lever 113 'is rotated clockwise by the urging force of the tension spring 112 as shown in FIG. In addition, the swing lever 11
The rotation of 3'is transmitted to the flange 108 via the transmission shaft 107 ', and the flange 108 rotates clockwise. Therefore, the dust cover 102 is opened.

During focus adjustment and focal length switching, the base plate 10 is moved in the optical axis direction by the rotation of the motor 12. But,
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 3c and the dustproof cover 102 are not moved.
There is no fear of interference with.

In the second embodiment shown in FIG. 18, the dustproof cover 102 is left fixed, and the taking lens barrel 3c can also be formed to have a small diameter. Therefore, in the second embodiment, the camera can be made more compact than in the first embodiment.

Between the crank lever 103 and the transmission shafts 107, 107 ′ of the dust cover opening / closing mechanism shown in FIGS. 14 and 18 described above, there is no mutual effect when the light shielding plates 101A, 101B, 101A ′, 101B ′ are closed. The flange 108, the coil torsion spring 109, and the pin 110 are provided to avoid the interference of the. However, the tension spring 112 that gives the swing lever 113 a clockwise turning habit.
A tension spring that is stronger than the urging force of the slide plate is provided on the slide plate, and when the focal length selection member 105 moves to the OFF position, the slide plates 119 and 119 'are displaced to the left by this tension spring, and the swing lever 113 is moved counterclockwise. If it is configured to rotate in the direction, the crank lever 103 can be directly coupled to the transmission shafts 107, 107 'except for the above-mentioned flange 108 and the like. 19th
The drawing shows a main part of a third embodiment of the present invention in which the crank lever 103 in FIG. 14 is directly connected to the crank lever 103 and the slide plate 119 'is biased by a tension spring 122 so as to be displaced leftward. FIG. The left side surface of the upper protruding portion 119'A of the slide plate 119 'is urged by a tension spring 122 so as to be constantly in pressure contact with the engagement pin 117, and the crank lever 116 supporting the engagement pin is rotated by a focal length. Selection member 1
Click groove 1 provided on the outer periphery of the rotating plate 123 that works with 05
It is constructed so that the tip end of the click spring 124 falls into the inside of 23A to be blocked. Further, the three click grooves 123A are provided corresponding to the telephoto position (T), the wide-angle position (W), and the OFF position, respectively, where the focal length selection member 105 is moved and set. Other members are shown in Figure 14
Since it is the same as the embodiment, 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, when the focal length selection member 105 is directly switched from the telephoto position (T) to the OFF position, the crank lever 117 rotates counterclockwise, so that the engagement pin 117 is moved to the 19th position.
Displaces to the left in the figure. Therefore, the slide plate 119 'is displaced leftward by being driven by the engaging 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, when the swing lever 113, which is in the feeding position together with the base plate 10, moves along the track L toward the feeding position, it abuts against the cam surface 121a of the protruding cam 121 and presses the cam surface 121a. At this time, since the tension spring 112 that biases the swing lever 113 has a weaker biasing force than the tension spring 122 that biases the slide plate 119 ', the swing lever 113 resists the biasing force of the tension spring 112. Then, it rotates counterclockwise in FIG. 19 and moves along the cam surface 121a. Its rocking lever
The counterclockwise rotation of 113 causes the crank lever 103 to rotate counterclockwise to displace the light shielding plate 102A, and the other crank lever 104 interlocking with the crank lever 103 rotates clockwise to rotate the other light shielding plate. The dustproof cover 102 is closed by displacing 101B. After the re-light-shielding plates 101A and 101B are in 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 slide plate 119 'is displaced to the right against the biasing force of the tension spring 122, and the protruding cam The left side surface 121b of the 121 is contacted and reaches the retracted position.
In this case, the upper protruding portion 119'A of the slide plate 119 'is separated from the engaging pin 117, but the focal length selecting member 105 is stopped at the OFF position by the click stop means composed of the click spring 124 and the click groove 123A. Placed in. Although not shown, this click stop device is also provided in the first embodiment of FIG. 14 and the second embodiment of FIG. In the third embodiment shown in FIG. 19, since the transmission shaft 107 is directly connected to the crank cam 114, the cover opening / closing mechanism is simplified, and the cover is installed in a narrow space as in the second embodiment (FIG. 16). It is convenient for.

All of the above embodiments relate to a protective cover for a bifocal camera, and are provided with cam means (protruding cam 121) that is displaced in association with the switching operation of the focal length selection member 105, and the focal length selection member is When the OFF position is switched to the wide-angle position or the telephoto position, the cam means is displaced prior to the movement of the main optical system 3 to open the dustproof cover 102, and the focal length selection member 105 is switched from the telephoto position to the OFF position. In this case, after the projecting cam 121 is displaced, the dustproof cover is closed by using the long retraction movement distance of the main optical system and the cam surface 121a of the projecting cam 121. Therefore, this protective cover device is also extended to beyond a close range position of a normal shooting area and is suitable for a macro shooting camera that can focus on an object at a certain distance within a predetermined macro area. , It can be applied only with the following simple changes.

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. Automatic focus adjustment circuit 31A when switch Sw4 is OFF
Is not activated, and only the shutter control circuit 31B may be activated. In FIG. 6, the focal length selection member 105 is renamed as a photographing area selection member, and the switching position of the focal length selection member 105 and the telephoto position symbol T are changed to a symbol M representing a macro region, Further, it is only necessary to change the symbol W at the wide-angle position to the symbol A that represents automatic focus adjustment in the normal photographing area.

Further, in the above-described first and second embodiments, the dustproof cover 102 is composed of two light shielding plates 102A and 102B that move in opposite directions. However, if the dust-proof cover 102 has a large accommodation space, it may be constructed by one sheet.

Further, in the above embodiment, the swing lever (cover opening / closing member) 113 is provided only when the focal length selecting member (operating member) 105 is switched from the telephoto position to the OFF position as shown in FIG. It is configured so as to be displaced by engaging with the cam surface 121a of the protruding cam 121. But its cam surface 12
Extend 1a 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 infinite position, the swinging lever 113 is displaced further leftward from the position shown in FIG. 15C by the extended cam surface. However, the pin 110 that contacts the crank lever 103 is
In Fig. 10, only a slight further counterclockwise displacement,
Since the dustproof cover 102 is placed in the closed state, it does not matter.

〔The invention's effect〕

As described above, according to the present invention, the dust cover is provided by the movement of the cover opening / closing member for opening / closing the dust cover 102 in the optical axis direction that moves together with the photographing optical system and the engaging means that is displaced according to the operation of the operation member. Since it is configured to be opened and closed, the taking lens barrel is housed inside the camera body when carrying the camera, not only is it extremely compact,
When the taking lens barrel moves from the extended position to the retracted position, the dust-proof cover automatically closes and covers the front surface of the taking lens, so that the taking lens is safely protected. Also, when the shooting lens is extended, the dustproof cover is opened in conjunction with the operating member prior to movement of the shooting lens, so there is no risk of interference between the dustproof cover and the shooting lens, and when the shooting lens is in the extended position Since the opening / closing member and the engaging means can be placed at positions greatly separated from each other, there is an advantage that the structure of the opening / closing mechanism of the dustproof cover can be made simple and compact.

Further, since the lens cover housed in the taking lens barrel is composed of a plurality of plate members, it is possible to prevent the taking lens barrel to be housed from increasing in size, which leads to downsizing of the camera.

[Brief description of drawings]

1 and 2 are cross-sectional views of a first embodiment of the present invention applied to a bifocal camera. FIG. 1 shows a telephoto state in which a main optical system and a sub optical system are combined, FIG. 2 shows the housed state in which the dustproof cover is closed after the sub optical system has moved to the retracted position, FIG. 3 is an external perspective view of FIG. 1, and FIG. 4 is the focal length selection member of FIG. Fig. 5 is an external perspective view showing the state in which the focal length selecting member of Fig. 3 is placed in the OFF position, and Fig. 6 is a partial cutaway view of the upper portion of Fig. 3. FIG. 7 is a plan view of FIG. 4, FIG. 7 and FIG. 8 are partially cutaway top views of FIG. 4 and FIG.
1 is a perspective view of the displacement mechanism of the main optical system of the embodiment shown in FIG.
10 is a perspective view of the base plate in FIG. 9 seen from the back, and FIG. 11 is
FIG. 10 is a cam diagram of the front cam in FIG. 10, FIG. 12 is a diagram of an optical system driving motor control circuit used in the embodiment of FIG.
FIG. 14 is a logic circuit diagram in FIG. 12, FIG. 14 is a perspective view showing a structure of a dustproof cover opening / closing mechanism which is a main part of the first embodiment of the present invention shown in FIG. 1, and FIG. 15 is FIG. 6A and 6B are explanatory views showing the relationship between the protruding cam and the swing lever in the inside, [a] is a state when the focal length selection member is placed in the telephoto position, [b] is a state where the focal length selection member is switched to the wide-angle position. The condition when
[C] shows a state when the focal length selection member is displaced to the OFF position, and [d] shows a state when the focal length selection member is switched from the OFF position to the telephoto position. See also Figure 16 and
FIG. 17 is a sectional view of a second embodiment of the present invention applied to a bifocal camera, FIG. 16 shows a telephoto state in which a main optical system and a sub optical system are combined, and FIG. FIG. 18 shows a housed state in which the dustproof cover is closed after the system has moved to the retracted position, and FIG. 18 is a perspective view showing a dustproof cover opening / closing mechanism which is an essential part of the first embodiment of the present invention shown in FIG. FIG. 19 is a perspective view showing an embodiment of a dustproof cover opening / closing mechanism different from FIGS. 14 and 18. [Explanation of symbols of main parts] 3 ... Main optical system (shooting lens), 4 ... Sub optical system, 3A,
3C …… Shooting lens barrel 10 …… Base plate, 12 …… Motor, 102 …… Dustproof cover, 103,
104 ... Crank lever, 105 ... Focal length selection member (operating member), 107 ... Transmission shaft, 113 ... Swing lever (cover opening / closing member), 119 ... Slide plate (engaging means), 121 ...
Projecting cam (engaging means)

Claims (2)

[Claims] 1. A camera having a camera body and a taking lens barrel movable in the optical axis direction at least between a retracted position and a retracted position, wherein a lens drive for driving the taking lens barrel in the optical axis direction. A plurality of means arranged inside the photographing lens barrel and movable between a closed position covering the front surface of the photographing lens and an open position retracting from the front surface of the photographing lens in a plane substantially perpendicular to the optical axis direction. And a cover opening / closing member that is disposed on the photographing lens barrel and has a connecting portion that connects the plurality of plate members, and that opens and closes the lens cover through the connecting portion when displaced. A first urging member for urging the lens cover toward the closed position, and a urging member for urging the cover opening / closing member toward the open position of the lens cover. Momentum A single urging member arranged on the camera body side that engages with the cover opening / closing member to open and close the lens cover formed of the plurality of plate members by moving the second urging member having different forces and the taking lens barrel. A camera provided with one engaging means. 2. The engaging means has an inclined portion having an inclination with respect to the optical axis and a parallel portion parallel to the optical axis, and the cover opening / closing means is displaced in a direction substantially perpendicular to the optical axis. The lens cover is opened and closed by the above, during the movement between the closed position and the open position of the lens cover, the cover opening and closing member and the engaging means are engaged at the inclined portion,
The camera according to claim (1), wherein when the lens cover is held in the open position, the cover opening / closing member and the engaging means engage with each other in the parallel portion.