JPH09127400A - Zoom lens driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a zoom lens driving device for a 3D camera capable of accurately alinging right and left focal distances by setting either of right and left zoom lenses as a master side and the other as a slave side and allowing a variable power lens on the slave side to follow the movement of a variable power lens on the master side. SOLUTION: Either zoom lens (master side) 10 out of two zoom lenses 10 and 20 arranged to be paired right and left directly controls a motor driver 64 by the operation of a zoom switch 36 so as to drive the variable power lens 12 in a telephoto direction or a wide direction. The other zoom lens (slave side) 20 controls a motor driver 74 by the use of a control signal in response to zoom position error voltage (voltage showing positional error between the variable power lenses 12 and 22) generated by a differential amplifier 30 and a comparator 32, so that the 2nd variable power lens 22 is driven in a direction where the error becomes small.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens driving device, and more particularly to driving a zoom lens of a twin-lens type 3D camera used for capturing a stereoscopic image for reproducing an image that gives an observer a stereoscopic effect. Regarding the device.

[0002]

2. Description of the Related Art Conventionally, a technique has been proposed in which a subject is photographed by two left and right cameras corresponding to both eyes to obtain a stereoscopic image that gives an observer a stereoscopic effect. FIG. 7 shows the configuration of a drive device for a zoom lens of a conventional twin-lens type 3D television camera. The zoom lens driving device shown in the figure is for synchronously controlling two video cameras 1 and 2 of equal left and right by a microprocessing device 3, and mainly drives a variable power lens 12 of a left zoom lens 10. The first drive unit 14 and the zoom position of the left zoom lens 10 (for example, a value indicating the position of the variable power lens 12)
And a second drive unit 24 for driving the variable power lens 22 of the zoom lens 20 on the right side.
And a second position detector 2 for detecting the zoom position on the right side
6, a micro processing unit (MPU) 34 for synchronously controlling the first and second drive units, a zoom switch 36 for performing a tele / wide switching operation, and the like. The left and right can be interchanged.

When the contact piece of the zoom switch 36 is brought into contact with the telephoto side (or the wide side), the MPU 34 simultaneously outputs control signals for operating the motor drive circuits 64 and 74. Then, the motor drive circuits 64 and 74 drive the motors 62 and 72 based on this control signal to move the variable power lenses 12 and 22 back and forth in the optical axis direction.
The positions of the variable power lenses 12 and 22 are respectively detected by the first and second position detectors 16 and 26,
The MPU 34 has been notified.

On the other hand, for focus adjustment, drive circuits 67 and 77 are controlled based on a signal from an autofocus (AF) means (not shown), and focus lenses 43 and 53 are moved back and forth via motors 66 and 76. , Focus adjustment is performed. Further, the focus lenses 43, 5
In No. 3, the position is automatically adjusted so that the focus does not shift as the variable power lenses 12 and 22 move. Then, the positions of the focus lenses 43 and 53 are detected by the sensors 68 and 78, respectively, and MP
U34 has been notified.

The subject light that has passed through the left side zoom lens 10 is imaged on the light receiving surface of the CCD 45 and converted into R, G, B signal charges in an amount according to the intensity of the light. R, G,
The B charge is read by a read pulse applied from the CCD drive circuit 46, separated by a CDS (correlated double sampling) circuit 47, and then subjected to known signal processing and output as an image signal. A timing signal from a reference signal generator (SSG) 49 is added to each of the CCD drive circuit 46, the CDS circuit 47, and the signal processing circuit 48 so that each circuit is synchronized. The same applies to the video camera on the right side.

[0006]

However, in the above-described conventional zoom lens driving device, there are individual differences even if the left and right equalizing zoom lens systems are prepared. There is a problem in that there is a difference in focal length. If an error occurs in the left and right focal lengths and a difference occurs in the left and right imaging magnifications, the image becomes very difficult to see, which gives the observer fatigue and is difficult to use for a long time.

The present invention has been made in view of the above circumstances, and when changing the focal lengths of the zoom lenses of the two video cameras on the left and right, the zoom capable of accurately matching the left and right focal lengths. An object is to provide a lens driving device.

[0008]

In order to achieve the above-mentioned object, the present invention provides a zoom lens driving device for driving a first and a second zoom lens arranged in a pair of left and right for capturing a stereoscopic image, A zoom switch for instructing zooming in the tele direction or the wide direction, a first drive means for driving the first zoom lens in the tele direction or the wide direction by operating the zoom switch, and the first and second respectively. First and second detecting means for detecting a zoom position indicating a shooting magnification of the zoom lens, and a shooting magnification of the second zoom lens based on the zoom position detected by the first and second detecting means. And second driving means for driving the second zoom lens so as to match the photographing magnification of the first zoom lens.

According to the present invention, two left and right pairs are arranged.
Of the two zoom lenses, the first zoom lens issues a zoom command in the tele direction or the wide direction by operating the zoom switch, while the second zoom lens changes the shooting magnification of the first zoom lens. Based on the zoom position indicated and the zoom position indicating the photographing magnification of the second zoom lens, the second driving unit causes the photographing magnification of the second zoom lens to match the photographing magnification of the first zoom lens. It is driven to follow. As a result, the difference between the left and right focal lengths can be made extremely small.

Further, in order to make the photographing magnification of the second zoom lens match the photographing magnification of the first zoom lens, it is necessary to reduce the error amount based on the error amount between the zoom positions of the first and second zoom lenses. It is effective to drive the second zoom lens.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a zoom lens driving device according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows the configuration of a driving device for a 3D zoom lens to which the present invention is applied. In the figure, the same or similar members as those of the conventional zoom lens driving device shown in FIG. 7 are designated by the same reference numerals. The drive device for the 3D zoom lens shown in FIG. 1 mainly includes a first drive unit 14 that drives the variable power lens 12 of the left zoom lens 10.
(Corresponding to a first driving unit) and the left zoom lens 1
The zoom position indicating the photographing magnification of 0 (for example, the variable magnification lens 1
The first position detector 16 for detecting a value indicating the position 2)
A second drive unit 24 for driving the variable power lens 22 of the right zoom lens 20 and a second position detector 2 for detecting the zoom position indicating the photographing magnification of the right zoom lens 20.
6 and the difference (error amount) from the zoom positions output from the first and second position detectors 16 and 26, respectively.
And a comparator that outputs a signal for controlling driving of the variable magnification lens 22 of the zoom lens 20 on the right side based on the error amount of the zoom position detected by the differential amplifier 30. Comparing circuit 32 and a micro processing unit (MP that performs various controls)
U) 34, a zoom switch 36 for operating the tele / wide switching, and the like. The left and right can be interchanged.

As the left and right video cameras, both video cameras having the same specifications are used. That is,
A lens section including a fixed lens 42, a variable power lens 12, and a focus lens 43, which constitute the left video camera, and a CCD 45, a CCD drive circuit (driver) 46, a CD
S circuit 47, signal processing circuit 48, and reference signal generator 4
9, a lens unit including a fixed lens 52, a variable-magnification lens 22, and a focus lens 53, which form the video camera on the right side, each member of the imaging unit including 9, and a CCD 55, a CCD drive circuit (driver) 56, a CDS circuit 57, The members of the image pickup unit including the signal processing circuit 58, the reference signal generator (SSG) 59 and the like are of the same quality.

The subject light that has passed through the lens portion of the left video camera is imaged on the light receiving surface of the CCD 45 and converted into R, G, and B signal charges in an amount according to the intensity of the light. R,
The G and B charges are read by a read pulse applied from the CCD drive circuit 46, separated by a CDS (correlated double sampling) circuit 47, and then subjected to known signal processing and output as an image signal. It still,
Timing signals from the SSG 49 are applied to the CCD drive circuit 46, the CDS circuit 47, and the signal processing circuit 48, respectively, so that the respective circuits are synchronized. The same applies to the video camera on the right side.

The first driving unit 14 on the left side is a motor 62 for applying power to drive the variable power lens 12 in the front-rear direction.
And a motor drive circuit (motor driver) 64 for operating the motor 62. When the zoom switch 36 is operated toward the tele or wide side, a control signal for driving the motor driver 64 is output from the MPU 34, and the motor driver 64 causes the variable power lens 12 to move in the tele direction based on the control signal from the MPU 34. Or drive in the wide direction. As a result, the focal length (shooting magnification) of the zoom lens is changed.

The zoom position indicating the photographing magnification of the zoom lens 10 is detected by the first position detector 16 as the position of the variable power lens 12. The first position detector 16
Is composed of, for example, a potentiometer, and the variable power lens 1
2 for the change of the position between the two tele-wide positions.
As shown in, it has a linear output characteristic. The first position detector 16 detects the position of the variable power lens 12 as a voltage (zoom position voltage: Va). The second position detector 26 is similar to the first position detector 16.

The zoom position voltage Va is notified to the MPU 34 shown in FIG. 1 and applied to the differential amplifier 30. With respect to focus adjustment, a motor 66 that applies power to drive the left focus lens 43 in the front-rear direction, a motor drive circuit (motor driver) 67 that operates the motor 66, and the focus lens 43.
And a sensor 68 for detecting the position of. The motor driver 67 is controlled by the MPU 34 based on a signal from an auto focus (AF) unit (not shown), drives the focus lens 43 to be in focus, and obtains a focus state according to the position of the variable power lens 12. The focus lens 43 is driven so as to be received. The position of the focus lens 43 is detected by the sensor 68 and notified to the MPU 34.

On the other hand, the second drive section 24 on the right side also has a motor 72 for giving power for driving the variable power lens 22 in the front-rear direction and a motor drive for operating the motor 72, as in the case of the left side described above. And a circuit (motor driver) 74, and drives the variable power lens 22 in the tele direction or the wide direction based on a control signal output from the MPU 34. Further, the zoom position indicating the position of the variable power lens 22 is detected by the second position detector 26, and the zoom position voltage Vb is applied to the differential amplifier 30 and the MPU.
34 is notified.

The configuration on the right side differs from the configuration on the left side in that the second drive section 24 outputs a signal from the comparator 32 based on the error amount of the left and right zoom positions detected by the differential amplifier 30. It is driven and controlled by That is, the second drive unit 24 uses the zoom switch 36.
The zoom lens 22 is driven so as to reduce the error in the zoom position caused by the movement of the left-side zoom lens that has been driven by the above operation. In other words, the left-side zoom lens is on the master side and the right-side zoom lens is on the slave side, and the slave-side variable power lens 22 follows the movement of the master-side variable power lens 12 to minimize the difference between the left and right focal lengths. I have to.
This drive control will be described later.

As for the focus adjustment on the right side, similarly to the left side, a motor 76 for giving power for driving the focus lens 53 in the front-rear direction, and a motor drive circuit (motor driver) 77 for operating the motor 76. A sensor 78 for detecting the position of the focus lens 53 is provided. The motor driver 77 operates on the basis of a signal from an auto focus (AF) unit (not shown).
It is controlled by the PU 34 to drive the focus lens 53 to be in focus, and also drive the focus lens 53 so as to obtain a focus state in accordance with the position of the variable power lens 22. Then, the position of the focus lens 53 is detected by the sensor 78 and notified to the MPU 34.

FIG. 3 shows an example of the circuit configuration of the differential amplifier and the comparator section shown in FIG. The circuit shown in the figure comprises an amplifier circuit 110, an operational amplifier circuit (operational amplifier) 130, a comparison circuit (hysteresis comparator circuit) 140, etc., and a high (H) output from the comparators 142 and 144 of the comparison circuit 140. ) / Low (L) signal, the output of the motor driver 74 is controlled to drive the motor 72.

The amplifier circuit 110 includes an amplifier 112 and a variable resistor 113 for amplifying the zoom position voltage Va of the zoom lens on the master side (left side), and a slave side (right side).
The zoom position voltage Vb is amplified by an amplifier 114, a variable resistor 115, and the like. The gains of the amplifier 112 and the amplifier 114 are adjusted by the variable resistors 113 and 115 so that the slopes of changes in the output voltage with respect to the input voltage are the same. Further, the output levels of the two are matched by an offset adjusting means (not shown).

As a result, the amplifier 112 and the amplifier 114 can obtain substantially linear outputs in the same manner with respect to the zoom position voltage which changes according to the zoom position change from wide to tele. . That is, the first
The output characteristics of the position detectors 16 and 26 are uniform with respect to the zoom position voltages Va and Vb output from the second position detectors 16 and 26 (see FIG. 2).

When the zoom position is changed between wide and tele, the first and second position detectors 16 and 26 output zoom position voltages Va and Vb corresponding to the zoom position, respectively. Va is the amplification circuit 110
Is amplified and output as Va ′, and the zoom position voltage Vb is amplified by the amplifier circuit 110 and output as Vb ′.

The amplified zoom position voltage Va 'is
The zoom position voltage Vb ′ is applied to the inverting input terminal of the operational amplifier 132, and the zoom position voltage Vb ′ is applied to the non-inverting input terminal of the operational amplifier 132. In the operational amplifier 132, based on the input voltage values Va 'and Vb', a zoom position error voltage V1 indicating an error between the zoom positions of the two is calculated by the following equation (1),

[0025]

## EQU1 ## V1 = A.times. (Vb'-Va '+ Vc) A is calculated according to the coefficient (1). The zoom position error voltage V1 calculated by the operational amplifier 132 is applied to the inverting input terminals of the comparators 142 and 144 of the comparison circuit 140. The comparison circuit 140 includes a first comparator circuit including a comparator 142 having a reference voltage set to V _ref U, and a reference voltage of V _ref U.
and a second comparator circuit including a comparator 144 set to _ref L. The reference voltage V _ref U
Is set to be larger than the reference voltage V _ref L (V
_ref U> V _ref L).

Further, the first and second comparator circuits
Each path has a hysteresis characteristic. That is,
The upper limit voltage of the comparator circuit of 1 is V_refUH, lower limit voltage
To V _refIf UL (see Figure 4), the zoom position error
The voltage V1 is V_refGradually V from smaller than UH_refTo UH
Approaching, V_refWhen UH is exceeded, the comparator 142 output
The force reverses from high (H) to low (L). Also, zoo
The position error voltage V1 is V_refGradually from larger than UL
V_refApproaching UL, V_refWhere it is smaller than UL
The output of the comparator 142 is inverted from L to H.

The output of the comparator 142 is the inverter 1
Input terminal of motor driver 74 inverted by 52
Added to INA. On the other hand, if the upper limit voltage of the second comparator circuit is V _ref LH and the lower limit voltage is V _ref LL (see FIG. 4).
), The zoom position error voltage V1 gradually approaches V _ref LL from the one larger than V _ref LL, and when it becomes smaller than V _ref LL, the output of the comparator 144 is inverted from L to H. Further, it gradually approaches V _ref LH from the zoom position error voltage V1 is less than V _ref LH, the output is high the comparator 144 beyond the V _ref LH (H) wax (L)
Flip to.

The output of the comparator 144 is applied to the input terminal INB of the motor driver 74 via the buffer gate 154. The motor driver 74 has input terminals INA and IN.
Based on the combination of the voltage signals applied to B, the voltage signals are output from the output terminals OUTA and OUTB, and the motor 72
Is driven or stopped.

FIG. 5 is a truth table of the motor driver 74, which shows the correspondence relationship between the output signals output from the motor driver 74 with respect to the combination of the input signals applied to the input terminals INA and INB. There is. Input terminal (INA,
When the input signals applied to (INB) are both low (L, L), the output terminals (OUTA, OUTB) of the motor driver 74
Outputs (L, L) respectively. In this case, the motor 72 is stopped.

When the input signals applied to the input terminals (INA, INB) are (L, H) respectively, the motor driver 7
From the 4 output terminals (OUTA, OUTB) respectively (L,
H) is output. In this case, the motor 72 is driven to the tele side. When the input signals applied to the input terminals (INA, INB) are (H, L), the motor driver 74
(H, L) from the output terminals (OUTA, OUTB) of
Is output. In this case, the motor 72 is driven to the wide side.

When the input signals applied to the input terminals (INA, INB) are (H, H) respectively, the motor driver 7
4 output terminals (OUTA, OUTB) respectively (H,
H) is output. In this case, the motor 72 is braked. Next, the operation of the zoom lens driving device configured as described above will be described with reference to FIG.

FIG. 6 shows an example of the control pattern. The zoom switch 36 shown in FIG. 1 is operated to the wide side to drive the zoom lens to the wide side, and then the zoom switch is once released. After that, when the zoom switch 36 is operated to the tele side to drive the zoom lens to the tele side, the change in the voltage of the zoom switch, the change in the zoom position error voltage, and the change in the voltage input to the motor driver are respectively represented by the horizontal axis. Is shown as the time axis (t).

When the zoom switch 36 is operated and the contact piece of the switch is brought into wide contact, a control signal is output from the MPU 34 to the motor driver 64 on the master side. The motor driver 64 uses the control signal to drive the motor 6
2 is driven. The power of the motor 62 moves the variable power lens 12 to the wide side. At this time, the first position detector 16 detects the position (zoom position) of the variable power lens 12, and outputs the voltage signal Va indicating the zoom position to the MPU 3
4 and the differential amplifier 30.

On the other hand, the motor driver 74 on the slave side
Is not driven immediately after the operation of the zoom switch 36, and the voltage signal Vb indicating the current zoom position on the slave side is output from the second position detector 26 to the MPU 34 and the differential amplifier 30. During a short time after the zoom switch 36 is operated, the error between the zoom position on the master side and the zoom position on the slave side is small, and the zoom position error voltage V1
Is the lower limit voltage V _ref of the comparator 142 shown in FIGS.
It is smaller than UL and larger than the upper limit voltage V _ref LH of the comparator 144. Therefore, the input terminal IN of the motor driver 74
The L signal is input to both A and INB, and the motor 72 that drives the variable magnification lens 22 on the slave side is stopped.

When the zoom switch 36 is operated in this manner, the variable power lens 12 on the master side is immediately driven as described above, but the variable power lens on the master side is operated for a short time after the operation of the zoom switch 36. Is not driven. afterwards,
When the error between the zoom position on the master side and the zoom position on the slave side gradually increases and the zoom position error voltage V1 exceeds the upper limit voltage V _ref UH of the comparator 142, the motor 74
The signal applied to the input terminal INA of is inverted from L to H. On the other hand, during this time, the L signal is always output from the comparator 144, and the L signal is applied to the input terminal INB of the motor 74. As a result, the motor 72 is driven to the wide side according to the truth table shown in FIG. 5, and the variable power lens 22 on the slave side moves to the wide side.

As the variable power lens 22 on the slave side moves to the wide side, the zoom position error voltage V1 gradually decreases. When the zoom position error voltage V1 becomes smaller than the lower limit voltage V _ref UL of the comparator 142, the output of the comparator 142 is inverted and the motor driver 74
The signal applied to the input terminal INA of is inverted from H to L. On the other hand, the L signal is always output from the comparator 144 during this period. As a result, the motor 72 stops according to the truth table shown in FIG.
2 stops.

While the contact piece of the zoom switch 36 is in contact with the wide side, the above operation is repeated, and the variable power lens 22 on the slave side follows the movement of the variable power lens 12 on the master side. Next, when the wide side contact of the zoom switch 36 is released, the motor driver 64 on the master side is released.
Immediately stops driving the motor 62. On the other hand, the slave-side motor driver 74 still maintains the zoom position error voltage V even if the wide-side contact of the zoom switch 36 is released.
The motor 72 is continuously driven until 1 becomes smaller than the lower limit voltage V _ref UL of the comparator 142. The variable magnification lens 22 on the slave side is moved to the wide side, the zoom position error voltage V1 at beyond the lower limit voltage V _{re f} UL comparator 142, the motor 72 is stopped. The motor 72
Immediately after stopping, the variable power lens 22 slightly moves due to inertial force.

Next, when the zoom switch 36 is operated and the contact piece of the switch is brought into contact with the tele side, the MPU 34 outputs a control signal to the motor driver 64 on the master side. The motor driver 64 drives the motor 62 based on the control signal. The variable power lens 12 moves to the telephoto side by the driving force of the motor 62. At this time, the position detector 16 detects the position (zoom position) of the variable power lens 12, and outputs the zoom position voltage Va to the MPU 34 and the differential amplifier 30.

As in the case of driving to the wide side, the variable power lens 12 on the master side is driven for a short time by operating the zoom switch 36. However, the zoom position on the master side and the zoom position on the slave side are driven. Is small, and the zoom position error voltage V1 is smaller than the lower limit voltage V _ref UL of the comparator 142 and larger than the upper limit voltage V _ref LH of the comparator 144. Therefore, the input terminals INA, IN of the motor driver 74
The L signal is input to both B, and the motor 72 that drives the variable power lens 22 on the slave side is stopped. That is, the variable magnification lens 22 on the slave side is not driven, and the error between the zoom position on the master side and the zoom position on the slave side gradually increases.

After that, when the error between the zoom position on the master side and the zoom position on the slave side becomes large and the zoom position error voltage V1 falls below the lower limit voltage V _ref LL of the comparator 144, the input terminal INB of the motor driver 74. The voltage signal applied to L is inverted from L to H. On the other hand, the H signal is always output from the comparator 142 during this period, and the L signal obtained by inverting the H signal by the inverter 152 is added to the input terminal INA of the motor 74. Then, according to the truth table shown in FIG. 5, the motor 72 is driven to the tele side,
The variable power lens 22 on the slave side moves to the tele side.

As the variable power lens 22 on the slave side moves to the tele side, the zoom position error voltage V1 gradually decreases. Then, when the zoom position error voltage V1 becomes larger than the upper limit voltage V _ref LH of the comparator 144,
The output of the comparator 144 is inverted from H to L, and the voltage signal applied to the input terminal INB of the motor driver 74 is switched from H to L. On the other hand, the H signal is always output from the comparator 142 during this period, and the L signal obtained by inverting the H signal by the inverter 152 is added to the input terminal INA of the motor 74. Then, according to the truth table of FIG. 5, the motor 72 is stopped, and the variable power lens 22 on the slave side stops moving.

While the contact piece of the zoom switch 36 is in contact with the telephoto side, the above operation is repeated, and the variable power lens 22 on the slave side follows the movement of the variable power lens 12 on the master side. When the telescopic contact of the zoom switch 36 is released, the master side motor driver 64 causes the motor 62 to move.
Immediately stop driving. On the other hand, the slave side motor driver 74 keeps the zoom position error voltage V1 at the comparator 14 even after the telescopic side contact of the zoom switch 36 is released.
The motor 72 is continuously driven until it becomes higher than the upper limit voltage V _ref LH of 4. Then, the variable power lens 22 on the slave side is moved to the tele side, and the motor 72 is stopped when the zoom position error voltage V1 exceeds the upper limit voltage V _ref LH of the comparator 144.

In this way, of the two left and right zoom lenses, one is the master side and the other is the slave side.
Since the slave lens is made to follow the movement of the master lens, the difference between the left and right focal lengths can be made extremely small.

[0044]

As described above, according to the zoom lens driving device of the present invention, the first and second left and right lenses are arranged.
Of the second zoom lens, the first zoom lens is directly driven in the tele direction or the wide direction according to the operation of the zoom switch, while the second zoom lens is used to indicate the photographing magnification of the first zoom lens. Based on the zoom position and the zoom position indicating the magnification ratio of the second zoom lens,
Since the photographing magnification of the second zoom lens is driven so as to match the photographing magnification of the first zoom lens, the difference between the photographing magnifications of the two can be reduced. As a result, the left and right focal lengths can be matched with each other with high accuracy, and good stereoscopic images can be captured.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a drive device for a 3D zoom lens to which the present invention has been applied.

FIG. 2 is a graph showing output characteristics of first and second position detectors.

FIG. 3 is a circuit configuration diagram of a drive device for the zoom lens of FIG.

4 is a graph showing the setting of the reference voltage of the comparison circuit shown in FIG.

FIG. 5: Truth table of motor driver

FIG. 6 is a diagram showing an example of a control pattern.

FIG. 7 is a configuration diagram of a conventional 3D zoom lens driving device.

[Explanation of symbols]

 10, 20 ... Zoom lens 12 ... First variable power lens 22 ... Second variable power lens 16 ... First position detector 26 ... Second position detector 30 ... Differential amplifier 32 ... Comparator 34 ... Micro processing Unit (MPU) 36 ... Zoom switch 62, 72 ... Motor 64, 74 ... Motor driver 130 ... Operation amplification circuit 140 ... Comparison circuit

Claims (3)

[Claims] 1. A zoom lens driving device for driving a first and a second zoom lens arranged in a pair to the left and right for capturing a stereoscopic image, comprising a zoom switch for instructing zooming in a tele direction or a wide direction, First driving means for driving the first zoom lens in a tele direction or a wide direction by operating a zoom switch, and first and second detecting means for detecting zoom positions indicating photographing magnifications of the first and second zoom lenses, respectively. Based on the second detection means and the zoom positions detected by the first and second detection means, the photographing magnification of the second zoom lens matches the photographing magnification of the first zoom lens. A second lens driving device that drives the second zoom lens, and a zoom lens driving device. 2. The positions of the first variable lens which constitutes the first zoom lens and the position of the second variable lens which constitutes the second zoom lens, respectively. The drive device for a zoom lens according to claim 1, wherein the drive is performed. 3. The second drive means calculates the error amount of the zoom position detected by the first and second detection means, respectively, and the second drive means decreases the error amount.
2. The zoom lens drive device according to claim 1, wherein the zoom lens is driven.