JPH09329736A - Zoom lens device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continuously change a focal distance by a device constituted so that power variable operation and focusing operation are executed by the rotation of one motor. SOLUTION: Two lens groups 11 and 12 are guided along a previously decided power variable locus by a guide means for power variable 20 at a power variable time. At a focusing time the front-group lens 11 is guided in the direction of an optical axis 13 by a guide means for focusing 18. Then, the driving of the motor 10 is respectively transmitted to the guide means 20 and 18 through different driving transmission systems 19 and 21. Besides, a driving switching means 15 is integrated between the transmission systems 19 and 21 and the reduction transmission system 14 of the motor 10. The switching means 15 is set at a position where the driving of the motor is transmitted to the transmission system 19 when a zoom lever 23 is set at a neutral position F and switched to a position where the driving of the motor 10 is transmitted to the transmission system 21 by linking with such operation that the lever 23 is set at a telephoto position T or a wide-angle position W.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens apparatus which utilizes a driving force of one driving source to move a variable power lens group and a focusing lens group respectively in the optical axis direction for variable power and focusing. It is a thing.

[0002]

2. Description of the Related Art A zoom lens which performs a zooming operation and a focusing operation by using a common driving means is disclosed in Japanese Patent Publication No. 6-10 / 1994.
No. 0707 has been proposed. This zoom lens includes a zoom ring, two lens groups, a motor for rotating the zoom ring, and the like, and performs a zooming operation by relatively moving the two lens groups on the inner periphery of the zoom ring. A first cam groove and a second cam groove for performing a focusing operation by moving the lens group so as to draw a locus different from the first cam groove are provided. The second cam grooves are alternately provided on an extension of the first cam groove, and determine a focusing position for each zooming position in accordance with a rotation angle of a zoom ring that is rotated by driving a motor.

[0003]

In such a zoom lens, a first variable power position, a focusing range at the first variable power position, a second variable power position, and a second variable power position are sequentially used. Since the cam groove is composed of a cam groove obtained by combining the first cam groove for zooming and the second cam groove for focusing so that the focusing range at the double position is... It can be used only at a position predetermined for each step on the zoom trajectory, and therefore there is a possibility that the focal length intended by the photographer cannot be changed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to perform zooming and focusing by using the driving of a single driving source. It is an object of the present invention to provide a zoom lens device capable of performing the following.

[0005]

In order to achieve the above object, in a zoom lens device according to the present invention, a zooming moving means for moving the zooming lens group along the optical axis direction and a focusing lens group are provided. Focusing moving means for moving along the optical axis direction, and switching means for transmitting the drive of the drive source to the zooming moving means during zooming and for transmitting the drive of the driving source to the focusing moving means during focusing. It is equipped with.

According to this, the zoom moving means and the focus moving means are separately provided, and the switching means transmits the drive of the drive source to the zoom moving means at the time of zooming, and the focus moving means at the time of focusing. Since the drive is transmitted to the moving means,
Any position on a predetermined variable power locus can be used as a variable power position. Further, according to the second aspect of the present invention, when the zooming operation is not performed, the position is switched to the position where the drive of the motor is transmitted to the moving means for the focus, so that the focusing operation can be performed quickly.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A schematic structure of a camera to which the present invention is applied will be described below with reference to FIG. Motor 10
Is driven by the switching means 15 via the deceleration drive transmission system 14.
Is transmitted to The switching means 15 is the drive switching means 15
a and a switching control means 15b, which is linked to the operation of a zoom operation lever 23 provided so as to be externally operated, and is connected to either one of the zoom moving means 16 and the focus moving means 17. Transmit drive. The variable-magnification moving means 17 drives a mechanical correction type variable-magnification guide means 20 that guides the two lens groups 11 and 12 on a predetermined variable-magnification locus, respectively. And a variable power transmission system 21 for transmission. The focus moving means 19 includes a focus guide means 18 for guiding the front lens group 11 to a focus position corresponding to each variable power position, and a focus drive transmission system 21 for transmitting drive to the focus guide means 18. It is configured. Then, the zoom moving means 16 and the focus moving means 17 are provided separately.

The zoom lever 23 is positioned at the neutral position F when it is not operated, and is rotated to either the tele position T or the wide position W on both sides of the neutral position. When the zoom lever 23 is in the neutral position,
The switching control means 15b switches the drive switching means 15a to the focus drive transmission position where the drive is transmitted to the focus drive transmission system 19, and when the zoom lever 23 is operated to the tele position T or the wide position W, the switching control means. 15b switches the drive switching means 15a to the variable power transmission position where the drive is transmitted to the variable power transmission system 21.

As shown in FIG. 2, the variable magnification guide means 20 and the focus guide means 18 are a fixed barrel 30 and a movable barrel 3.
1, a straight-moving barrel 32, a straight-moving guide frame 33, a focusing cam barrel 34, and the like. In the figure, the reference numeral 22 on the left side is the film surface, and the right side is the subject side.

The variable-magnification drive transmission system 21 is composed of an input-side variable-magnification input gear 21a and an output gear 21b which meshes with the variable-speed input gear 21a. The output gear 21b is meshed with a gear portion 37 formed on the outer periphery of the rear end of the movable barrel 31 via an opening 38 for the straight guide of the fixed barrel 30. The movable barrel 31 is engaged with the inside of the fixed barrel 30 by the helicoids 35 and 36, and when the drive is transmitted from the variable power transmission system 21, the movable barrel 31 advances and retracts in the direction of the optical axis 13 according to the leads of the helicoids 35 and 36. To do.

A straight-moving barrel 32 is rotatably mounted inside the moving barrel 33. The rectilinear guide frame 33 is fixed to the rectilinear cylinder 32 on the rear end side thereof.
It moves together with the movable barrel 31 in a state in which it is prevented from rotating by the engagement of the opening 38 with the opening 38. The output gear 21b described above is attached to the linear guide frame 33. And
Since the input gear 21a has a long shape along the optical axis direction, it is possible to maintain the state in which the output gear 21b meshes with the input gear 21a and the gear portion 37 even if the movable barrel 31 moves.

The front lens group 11 and the rear lens group 12 are built in the straight-moving barrel 32. Of these, the rear lens group 12 is attached so as to be movable along the direction of the optical axis 13. A cam pin 39 is attached to the holding frame 12a of the rear lens group 12 so as to project from the outer circumference. The cam pin 39 is engaged with a cam groove 41 formed on the inner circumference of the movable barrel 31 via a straight guide hole 40 of the straight barrel 32. The cam groove 41 is a zooming cam, and moves the rear lens group 12 forward and backward along the direction of the optical axis 23 by the displacement of the movable barrel 31 according to the rotation. Therefore, the variable power transmission system 2
When the drive of the motor 10 is transmitted to the front lens group 1,
Is moved to the variable power position by the movement of the movable barrel 31, and the rear lens group 12 is moved by combining the movement amount of the movable barrel 31 and the displacement of the cam groove 41.

A front group lens 11 is movably incorporated along the direction of the optical axis 13 at the inner front end side of the rectilinear barrel 32. A cam pin 42 is attached to the outer periphery of the holding frame 11a of the front lens group 11 so as to project. This cam pin 27
Engages with a cam groove 44 formed in the inner circumference of the cam barrel 34 through a straight guide hole 43 formed in the straight barrel 32. The cam groove 44 is a focusing cam that moves the front lens group frame 11 along the direction of the optical axis 13 without rotating due to displacement in the direction of the optical axis 13.

The cam barrel 34 is rotatably mounted inside the straight-moving barrel 32, and has a gear portion 45 formed on the outer periphery thereof. The gear 45 has a focus drive transmission system 1
The output gear 19a forming the gear 9 is in mesh. The focus drive transmission system 19 includes a gear 19 in addition to the output gear 19a.
b, a gear 19c, and an input gear 19d. The output gear 19a and the gear 19b are coaxial with the shaft 46.
Are connected by Both ends of the shaft 46 are rotatably supported by the rectilinear cylinder 32 and the rectilinear guide frame 33.

The gear 19b includes a straight-moving barrel 32 and a moving barrel 3.
1, and the gear 19c meshes with each of the openings provided in the fixed cylinder 30. The gear 19c is attached to the linear guide frame 33, and the input gear 19d is attached to the optical axis 13
Since it has a long shape along the direction of
Even if is moved, the state in which the gear 19b and the input gear 19d are in mesh with each other is maintained. As a result, when the drive of the motor 10 is transmitted to the focus drive transmission system 19, the cam barrel 34 is rotated and the displacement of the cam groove 44 causes the front lens group 1 to move.
2 is moved along the direction of the optical axis 13.

The cam barrel 34 is rotated less than one revolution to extend the front lens group 11 and focus from infinity to the closest point. A detection plate 34a for detecting the focus origin position is attached to the cam barrel 34 on the outer circumference and long along the circumferential direction. This detection plate 3
Reference numeral 4a indicates that when the rotation position of the cam barrel 34 is the initial position, it is removed from the transmissive photoelectric sensor 34b and turned on, and the cam barrel 34 rotates from now on in the direction of focusing close. Therefore, the photoelectric sensor 34b is shielded after a predetermined rotation, and the photoelectric sensor 34b is kept blocked during the rotation of the focus adjustment area.

The variable power position is detected by the code plate 47 arranged along the direction of the optical axis 13 and the rectilinear barrel 33.
This is done with a slider 48 that slides on the code plate 47. The code plate 47 is provided with a code indicating the wide end, the tele end, and an arbitrary zoom position between them.
The slider 48 interlocks with the movement of the rectilinear barrel 33 and causes the cord plate 4 to move.
Slide on 7 and output the scaling code at that time.
Reference numeral 30a shown in FIG. 2 is a front cover, and further reference numeral 4
A shutter block 9 is fixed to the straight-moving barrel 32.

The drive switching means 15 is composed of a switching gear train 50 and a drive switching lever 51, as shown in FIG. The switching gear train 50 is composed of three gears 50a to 50c attached to the arm portion between the bent portion and one end of the V-shaped drive switching lever 51,
The drive of the motor 10 is input to the gear 50a provided at the bent portion. The drive switching lever 51 has a variable power transmission position for engaging the variable speed input gear 21a with a connecting gear 50c that is the output of the switching gear train 50 centered on the axis of the input gear 50a provided at the bent portion, and a focus input. It is rotatably attached to a focus drive transmission position that meshes with the gear 19d.

The switching control means 22 comprises a cam disk 52 and a cam pin 51a provided at the other end of the drive switching lever 51. This cam pin 51a is connected to the cam disc 52
It engages with the flat cam 52a formed on the. The cam disc 52 is rotated in the forward and reverse directions according to the rotational operation of the zoom lever 23 transmitted through the gear trains 53 and 54, and the return spring 55 positions the zoom lever 23 at the neutral position F. Is urged to. Flat cam 52a
When the zoom lever 23 is located at the neutral position F, the drive switching lever 51 is set to the focus drive transmission position, and the zoom lever 23 is set to the tele position T or the wide position W.
When it is operated to, the drive switching lever 51 is switched to the variable power transmission position.

A slider 56 is attached to the zoom lever 23. This slider 56 is used for the zoom lever 23.
It slides on the cord plate 57 according to the operation of. The code plate 57 is provided with a code indicating the operation position of the zoom lever 23, that is, a neutral position, a tele position, and a wide position (not shown). When the slider 56 moves to one of these codes, a signal corresponding to the operation position of the zoom lever 23 is sent to the control unit 58. The control unit 58 controls the motor 1 via the driver 59 when the zoom lever 23 is operated to the tele position T.
0 is driven in the normal direction, and when the wide position W is operated, the motor 10 is driven in the reverse direction via the driver 59.

The controller 58 monitors the variable power position signal from the slider 48 described above. This focal length information is used for drive control of the motor 10 and for exposure control by determining the F value of the zoom lenses 11 and 12 that changes according to the zoom position.

When the zooming operation is completed, the zoom lever 23
Changes to the neutral position, and the focusing operation becomes possible. When a half-press operation corresponding to half the stroke of the shutter button 62 is performed, the control unit 58 actuates the distance measuring mechanism 63, obtains the subject distance information, and then calculates the number of pulses in accordance with the information, and also turns on the motor 10. Drive forward. The number of pulses is determined for each subject distance obtained from the distance measurement result, and is stored in the ROM 64 in advance. In addition,
The number of pulses corresponding to the subject distance can be the same regardless of the zoom position.

An impeller 60 is attached to the output shaft of the motor 10. A transparent photoelectric sensor 61 is attached to the impeller 60. The photoelectric sensor 61 is
The rotation angle of the motor 10 is detected, and a pulse signal corresponding to this rotation angle is sent to the control unit 58. The control unit 58 outputs the O from the photoelectric sensor 34b obtained by the cam cylinder 34 rotating a predetermined amount after starting the driving of the motor 10 at the time of the focus.
Monitor the FF signal. Then, the pulse signal obtained from the photoelectric sensor 61 is counted from the time when the OFF signal is received, the count value is compared with the calculated number of pulses, and the driving of the motor 10 is stopped at the same time.

Next, the operation of the above configuration will be described. The initial state of the zoom lenses 11 and 12 is the wide position shown in FIG. As shown in FIG. 4, the zoom lever 23 is kept in the neutral position F by the return spring 55. At this time, the drive switching lever 51 is
By the control of the plane cam 52a, the connecting gear 50c is brought into the state of the focus drive transmission position where the input gear 19d of the focus drive transmission system 19 is engaged.

When the zoom lever 23 is rotated toward the tele position T, the gear 54 rotates clockwise and the gear 53 rotates.
Rotates counterclockwise, and the cam disk 52 coaxially connected to the gear 53 also rotates counterclockwise as shown in FIG. As a result, the flat cam 52a controls the cam pin 51a to rotate the drive switching lever 51 clockwise around the shaft 51b. Then, before the rotational operation of the zoom lever 23 reaches the tele position T, the switching gear train 5
The connecting gear 50c of 0 is the input gear 2 of the variable power transmission system 21.
Mesh with 1a.

The rotating operation of the zoom lever 23 is performed at the tele position T.
When reaching the position, a signal indicating that the tele position operation is performed is transmitted from the code plate 56, and the control unit 58 causes the motor 10 to operate.
Is driven forward.

When the normal rotation drive of the motor 10 is started, this drive is transmitted to the deceleration drive transmission system 14, the switching gear train 50, and the input gear 21a of the variable power transmission system 21, and this rotation is transmitted to the gear 21b. It is transmitted to the gear 37 of the moving barrel 31 via the rotating barrel 31, and the moving barrel 31 rotates. Thereby, the moving cylinder 31
Is drawn toward the subject side in the direction of the optical axis 13 according to the leads of the helicoids 35 and 36 between the fixed barrel 30 and the fixed barrel 30.

When the movable barrel 31 is rotationally moved, the straight barrel 32 is moved.
Of the front lens group frame 12 and the rear lens group frame 12 which are moved integrally in a state where
And move in the same way as the moving barrel 11 toward the subject side. Of these, the rear lens group frame 12 is moved by the displacement of the cam groove 41 caused by the rotation of the movable barrel 31, and therefore the movement of the movable barrel 31 and the displacement of the cam groove 41 are combined.

When the operation of the zoom lever 23 is stopped, the zoom lever 23 is urged by the return spring 55 to move to the neutral position F.
Is returned to. By returning at this time, the slider 56 is separated from the code indicating the tele position, and the control unit 58 stops the driving of the motor 10. Further, the drive switching lever 51 is also reversely rotated in association with the return of the zoom lever 23, the coupling gear 50c of the switching gear train 50 is separated from the input gear 21a of the variable power transmission system 21, and the drive switching lever 51 is again moved to the position shown in FIG. Four
In the state of the focus drive transmission position shown in (4), the connecting gear 50c becomes the input gear 19d of the focus drive transmission system 19.
Mesh with. At this time, the slider 56 is connected to the code representing the neutral position of the code plate 57, and the control unit 58 receives the signal representing the neutral position of the zoom lever 23. Then, the control unit 58 determines the zoom position of the zoom lenses 11 and 12 from the code signal obtained from the slider 48 during this period.

When the shutter button 62 is pressed halfway down, the control section 58 confirms the neutral position of the zoom lever 23 and then operates the distance measuring mechanism 63 to measure the subject distance. Then, the number of pulses stored in the ROM 64 is calculated from the obtained subject distance. At this time, the control unit 58
It is confirmed whether or not the photoelectric sensor 34b for detecting the focus origin is turned on. If not ON, the motor 10
Is driven in the reverse direction to return the cam barrel 34 to the initial position.

After that, the number of pulses obtained from the photoelectric sensor 61 is counted from the time when the photoelectric sensor 34b is turned off by driving the motor 10 in the normal direction, and when the count value reaches the number of pulses calculated previously, the motor 10 is rotated. Stop driving.

The drive of the motor 10 during this period is input to the input gear 19d of the focus drive transmission system 19 via the reduction drive transmission system 14 and the switching gear train 50. Input gear 1
When the drive is transmitted to 9d, this drive is transmitted to the gear 19c, the gear 19b, and the gear 19a, and finally the cam barrel 3
4 is transmitted to the gear portion 45. When the drive is transmitted to the gear portion 45, the cam barrel 34 is rotated inside the straight advance barrel 32,
The cam groove 42 is displaced in the direction of the optical axis 13. This allows
The front lens group 11 moves in the direction of the optical axis 13 while being prevented from rotating, and is guided to the in-focus position.

When the photographer performs a full-press operation of further pressing the stroke of the shutter button 62 from the half-press, the control unit 58
Activates the shutter mechanism. . After the exposure is completed, the control unit 58 drives the motor 10 in the reverse direction to return the cam barrel 34 to the initial position and return the front lens group 11 to the original position. From the half-pressing operation of the shutter button 62 to the completion of the exposure, the control unit 58 invalidates the zooming operation by the operation of the zoom lever 23. If the zoom lever 23 is erroneously operated between the half-press operation of the shutter button 62 and the completion of focusing drive, the control unit 58 causes the focus of the motor 10 to change due to a signal change of the code plate 57. The driving or exposure operation is stopped. At this time, the shutter button 62 is pressed halfway again to return. In the above embodiment, the front group lens 11 is moved to the in-focus position by half-pressing the shutter button 62, but instead of this, the front group lens 11 is moved to the in-focus position by full-press operation. The exposure may be performed after that.

Next, a case where the zoom lever 23 is operated to the wide position W will be described. As shown in FIG. 7, when the drive switching lever 51 is switched to the variable power transmission position, the control unit 58 is provided with the zoom lever 2 from the code plate 57.
A signal for operating 3 at the wide position is input. After that, the control unit 58 drives the motor 10 in the reverse direction to move the moving cylinder 11
Is moved toward the wide ends of the zoom lenses 11 and 12. During this time, the control unit 58 monitors the variable magnification code signal obtained from the slider 48, and stops the driving of the motor 11 when the wide end signal is obtained. This allows the zoom lens 1
1, 12 are in the wide position shown in FIG. In the wide position, the movable barrel 31 is completely retracted into the camera body.

FIG. 8 shows another embodiment in which the camera described in FIG. 3 is provided with a lens barrier. The lens barrier is closed when the camera is not in use. At this time,
Since the lens barrier does not close when the movable barrel 31 is extended, in this embodiment, even when the movable barrel 31 is extended, the lens barrier is slidably movable and automatically linked with this operation. The movable barrel 31 is moved to the retracted position. At this timing, the movable barrel 31 is moved toward the wide position immediately before the lens barrier collides.

The lens barrier 70 is composed of two plates, a decorative plate 71 and a blindfold plate 72. The decorative plate 71 is formed with an arcuate cutout portion 71a along the outer periphery of the movable barrel 31 on the insertion direction side that enters the front surface of the lens barrel, and has a closed position for covering the lens barrel from the front surface and an open position for withdrawing from this position. Is supported slidably in a direction orthogonal to the optical axis 13. The blindfold plate 72 is supported behind the decorative plate 71 so as to be movable between a position where the cutout portion 71a is covered from the rear and a position where the cutout portion 71a is retracted therefrom.
It is urged toward the position covered by 3.

The decorative plate 71 is shown in the open position as shown in FIG. 9 in order to minimize the sliding movement and to make it compact.
As shown in FIG. 5, the movable cylinder 31 is positioned at a limit position that allows it to be extended. In such a state, the lens barrier 7
When 0 is moved toward the closed position, the blindfold plate 72 is pushed against the outer periphery of the moving cylinder 31 against the bias of the spring 73 and retracts, until the cutout portion 71a abuts the outer periphery of the moving cylinder 31. The decorative plate 71 slides, and the lens barrier 70 is maintained in the state shown in FIG.

By the movement during this time, the upper piece 71b integrally provided on the decorative plate 71 pushes the projection 74 of the disk 74 provided coaxially with the zoom lever 23 to rotate the zoom lever 23 to the wide position W. At this timing, as described above, the zoom lever 23 is rotated to the wide position W immediately before the lens barrier hits the moving barrel 31. After that, after the drive switching lever 51 is switched to the variable power transmission position, the reverse rotation drive of the motor 10 is started, and the movable barrel 31 is moved toward the collapsed position. Then, when the movable barrel 31 reaches the retracted position, the driving of the motor 10 is stopped and the sliding operation of the lens barrier 70 to the closed position is permitted. Then, when the lens barrier 70 is moved to the closed position as shown in FIG. 11, the lower piece 71c provided on the decorative plate 71 turns on the power-off switch 75, and the power of the camera is turned off.

In the above embodiment, the two-group zoom lens is used, and one of the two zoom lens groups is used as the focusing lens group. However, the present invention is not limited to this, and a lens different from the zoom lens group is used. The present invention can also be applied to a zoom lens that moves a group during focusing. For example, a variator lens group and a compensator lens that are composed of a focusing lens group, a variator lens group, a compensator lens group, and a relay lens group in this order from the object side, and the zoom lens group is different from the focusing lens group. There is a 4-group zoom lens made up of groups.

In this case, the switching means switches to the position for transmitting the drive of the motor to the moving means for zooming in conjunction with the operation of the zoom operating member, and the moving means for zooming uses the driving of the motor. The variator lens group and the compensator lens group are relatively moved in the optical axis direction. When the zoom operation member is not operated, the switching means switches to a position where the drive of the drive source is transmitted to the focus moving means. Therefore, when focusing, the focus moving means is different from the zoom lens group for focusing. The lens group is moved in the optical axis direction.

Further, in the above-described embodiment, the state in which the drive of the motor is transmitted to the focus moving means when the scaling operation is not carried out is made, but separately from this, for example, the initial state of the switching means is made neutral. The position is set to the position where the switching means switches to a position where the drive of the motor is transmitted to the moving means for zooming in linkage with the zooming operation, and during focusing, that is, in conjunction with the half-pressing operation of the shutter button, the switching means switches the motor You may make it switch to the position which transmits a drive to the moving means for a focus. In this case, a half-press operation of the shutter button is electrically detected, and an actuator or the like is driven according to the detection to drive the drive switching lever 51.
An electric switching control means for switching between is required.

Further, the switching control means 15b is a mechanical mechanism of the cam disk 54 and the cam pin 51a of the lever 51, but the present invention is not limited to this, and various other means can be adopted. Further, it is possible to employ an electrical switching control means for electrically detecting a scaling operation and driving an actuator or the like in response to the detection to switch the drive switching lever 51. Further, instead of the zoom lever 51, a pair of push button type zoom operating means for tele operation and wide operation may be adopted.

[0043]

As described above, in the zoom lens apparatus according to the present invention, the variable power guide means and the focus guide means are separately provided, and the switching means switches the drive of the drive source between the variable power and the focus. Therefore, the focal length of the zoom lens can be continuously changed. Further, according to the invention of claim 2, when the scaling operation is not performed, the switching means is switched to a position for transmitting the drive of the motor to the moving means for the farcus,
Focusing operation can be performed quickly, and failures such as missing a photo opportunity can be prevented.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an outline of a zoom lens device of the present invention.

FIG. 2 is a cross-sectional view showing a state of the zoom lens barrel at a wide position (collapsed position).

FIG. 3 is a perspective view showing a main part of a drive transmission system outside the lens barrel.

FIG. 4 is an explanatory diagram showing a state of a drive switching lever when the zoom lever is in a neutral position.

FIG. 5 is an explanatory diagram showing a state of a drive switching lever when the zoom lever is operated to a tele position.

FIG. 6 is a cross-sectional view showing a state in which the zoom lens barrel is in the tele position.

FIG. 7 is an explanatory diagram showing a state of a drive switching lever when the zoom lever is operated to a wide position.

FIG. 8 is a perspective view showing an outline of an embodiment in which the lens barrel is moved to the retracted position in conjunction with the closing operation of the lens barrier.

FIG. 9 is an explanatory diagram showing an open state of a lens barrier.

FIG. 10 is an explanatory diagram showing a state in which the lens barrier is slightly moved toward the closed position.

FIG. 11 is an explanatory diagram showing a closed state of a lens barrier.

[Explanation of symbols]

 10 Motor 11 Front Group Lens 12 Rear Group Lens 23 Zoom Lever 30 Fixed Cylinder 31 Moving Cylinder 32 Straight Traveling Cylinder 33 Straight Traveling Guide Frame 34 Focusing Cam Cylinder 51 Drive Switching Lever 52 Cam Disc

Claims (3)

[Claims] 1. A zoom lens device for performing zooming and focusing by moving a zooming lens group and a focusing lens group respectively in the optical axis direction by using the driving of one driving source. For moving the focusing lens group along the optical axis direction, a focusing moving means for moving the focusing lens group along the optical axis direction, and a driving means for changing the driving power source during the scaling. A zoom lens device, comprising: a switching unit that transmits the driving force of the drive source to the focusing moving unit during focusing. 2. The switching means switches to a position where the drive of the drive source is transmitted to the zoom moving means in conjunction with the operation of a zoom operation member provided so as to be externally operable. The zoom lens device according to claim 1, wherein when the zoom operation member is not operated, the position of the drive source is switched to a position for transmitting the drive to the focus moving unit. 3. The zoom operation member is rotatable between a tele position and a wide position on both sides of the neutral position, and is returned to the neutral position by urging of an urging means when no operation is performed. It is a lever, the switching means,
When the zoom operation lever is in the neutral position, the drive of the drive source is transmitted to the focus moving means, and the drive source is operated when the zoom operation lever is operated to the tele position or the wide position. The zoom lens device according to claim 2, wherein the zoom lens device is switched to a position at which the drive of (1) is transmitted to the moving unit for zooming.