JPH09187040A - Driver for zoom lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driver for a 3D zoom lens in which left/right image pickup magnification is matched with high accuracy by controlling electronic zooming so that one image magnification is coincident with other image magnification based on zoom position data denoting image pickup magnification of left/right zoom lenses. SOLUTION: Zoom positions of left/right magnification lenses 12, 22 are detected respectively by position detectors 16, 26 as zoom position voltages Va, Vb, the zoom position voltage is A/D-converted and LUTs 18, 28 are used to correct the zoom position data in order to make the detection characteristic of both the position detectors in matching with each other. The zoom position data are fed to a comparator 30 and a motor driver 74 for driving the magnification lens 22 is controlled based on the output of the comparator 30. Furthermore, the magnification of the electronic zoom of an electronic zoom circuit 94 is controlled based on the zoom position data to eliminate a slight error in the image pickup magnification during tracing drive of the magnification lens 22 on an image.

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 a zoom lens driving device of a twin-lens 3D camera used for capturing a stereoscopic image that reproduces an image that gives an observer a stereoscopic effect. Regarding

[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. 9 shows the configuration of a drive device for a zoom lens of a conventional twin-lens 3D camera. The zoom lens driving device shown in FIG.
The two video cameras 1 and 2 are synchronously controlled by the microprocessing device 3, and mainly include a first drive unit 14 that drives the variable magnification lens 12 of the left zoom lens 10 and the left zoom lens 10. A first position detector 16 for detecting the zoom position (for example, a value indicating the position of the zoom lens 12), a second drive unit 24 for driving the zoom lens 22 of the right zoom lens 20, and A second position detector 26 for detecting the right zoom position, a micro processing unit (MPU) 34 for synchronously controlling the first and second drive parts, and a zoom for performing a tele / wide zooming command operation. It is composed of a switch 36 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, motor 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 forward and backward via motors 66 and 76, respectively. It is moved and the focus is adjusted. Further, the focus lenses 43 and 53 are automatically adjusted in position so as not to be out of focus with the movement of the variable power lenses 12 and 22, respectively. And the sensors 68, 7
The positions of the focus lenses 43 and 53 are respectively detected by 8 and notified to the MPU 34.

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, even if the left and right equal zoom lens systems are prepared, due to individual differences in the lenses, the position of the variable magnification lens, or Since the focal lengths are not the same, there is a problem that an error occurs in the left and right zoom magnifications.

In addition, one of the zoom lenses is used on the master side,
With the other zoom lens as the slave side, the master side zoom lens is driven by operating the zoom switch,
Even when the slave side zoom lens is configured to follow and drive based on the error in both zoom positions, the non-linearity of the detector that detects the left and right zoom positions causes There is a problem that the degree changes greatly.

If there is a difference between the left and right photographing magnifications, the image becomes very difficult to see, which causes fatigue to the observer and makes it difficult to use it for a long time. The present invention has been made in view of the above circumstances, and a zoom lens driving device that can accurately match the left and right image magnifications when changing the focal lengths of the left and right video camera zoom lenses. The purpose is to provide.

[0009]

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. Based on the first and second detecting means for detecting the zoom position indicating the photographing magnification of the zoom lens, and the zoom position data detected by the first and second detecting means, the photographing of the second zoom lens Second driving means for driving the second zoom lens so that the magnification matches the photographing magnification of the first zoom lens; and the first and second zooms, respectively. Of the pair of images captured by the first and second image capturing means and the first and second image capturing means that captures the subject image that has passed through the lens, one image magnification is made to match the other image magnification. And an electronic zooming unit that electrically expands and contracts based on the zoom position data detected by the first and second detecting units.

According to the present invention, of the left and right zoom lenses, the first zoom lens issues a zooming command in the tele direction or the wide direction by operating the zoom switch, and the second zoom lens performs the zoom operation. Driving is performed so that the left and right photographing magnifications match based on the position data, and the movement of the first zoom lens is followed. At this time, based on the output of the position detector that detects the left and right zoom positions, one image magnification is electrically adjusted so as to match the other image magnification.
It is possible to eliminate even a slight error in the photographing magnification while following the zoom lens on the image. As a result, the first and second
It is possible to match the left and right image magnifications with high accuracy even during driving of the zoom lens.

In order to achieve the above object, the present invention provides a zoom lens driving device for driving a pair of first and second zoom lenses arranged in a left-right pair for capturing a stereoscopic image, in a tele direction or a wide direction. Zoom switch for instructing zooming, first driving means for driving the first zoom lens in the tele direction or the wide direction by operating the zoom switch, and photographing magnifications of the first and second zoom lenses, respectively. Is input, and the zoom position data of at least one of the first and second detecting means for digitizing and outputting the detected zoom position data and the first and second detecting means are input. Then, the output value corresponding to the digital value of the input signal is stored in advance,
At least one look-up table that corrects so that the zoom position detection characteristics of the first and second detecting means match, and the zoom detected by the first and second detecting means and corrected by the look-up table Second driving means for driving the second zoom lens so that the photographing magnification of the second zoom lens matches the photographing magnification of the first zoom lens based on the position data; and the first driving means, respectively. And a first and second image pickup means for picking up a subject image that has passed through the second zoom lens, and a pair of images picked up by the first and second image pickup means An electronic zoom unit that electrically expands and contracts based on the zoom position data detected by the first and second detection units so as to match the magnification. To have.

According to the present invention, at least one of the zoom position data is corrected by the look-up table in consideration of the variation and non-linearity of the output characteristics of the position detector for detecting the left and right zoom positions, and the output of both is obtained. The characteristics are made uniform. Further, based on the zoom position data, one image magnification is electrically scaled so as to match the other image magnification, so that a slight magnification error during tracking of the second zoom lens. Can also be resolved on the image. Accordingly, the left and right image magnifications can be matched with each other with high accuracy even during the driving of the first and second zoom lenses.

[0013]

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. 9 are designated by the same reference numerals. The driving device for the 3D zoom lens shown in FIG.
Is controlled by the microprocessing device 3 and the zoom switch 36 for performing a tele / wide zooming command operation.

The video cameras 1 and 2 have substantially the same configuration on the left and right, and each camera is roughly divided into a lens system, a lens control system, and an image pickup system. The video camera 1 will be described as the left side and the video camera 2 as the right side, but the left and right can be interchanged. Left video camera 1
The lens system includes a fixed lens 42, a variable power lens 12, and a focus lens 43. The photographic magnification is changed by moving the variable power lens 12 back and forth, and the focus is adjusted by moving the focus lens 43 back and forth. To be done.

The lens control system includes a zoom lens control system for driving and controlling the variable power lens 12 and a focus lens 43.
And a focus lens control system for driving and controlling. The zoom lens control system includes a motor 62 for driving the zoom lens 12, a motor drive circuit (motor driver) 64 for operating the motor 62, and the zoom lens 12
The motor driver 64 is controlled by a control signal from the MPU 34, and drives the motor 62 based on the control signal. That is, the zoom switch 36
When a zooming command is issued in the tele direction by the MPU 34
, A control signal of a tele signal = high (H) and a wide signal = low (L) is output to the motor driver 64, and when the zoom switch 36 issues a zooming command in the wide direction, the MPU 34 outputs a tele signal = L. , A wide signal = H control signal is output to the motor driver 64. When the zooming command from the zoom switch 36 is released, a control signal of tele signal = L and wide signal = L is output to the motor driver 64. Then, the motor 62 drives the variable power lens 12 back and forth,
The shooting magnification of the zoom lens 10 is changed.

The first position detector 16 is composed of, for example, a potentiometer and detects the position of the variable power lens 12 between the tele end and the wide end as a zoom position voltage Va. The zoom position voltage Va is used as information indicating the photographing magnification of the left zoom lens 10. The zoom position voltage Va is 0 to 2 by the AD converter 17.
After being digitized in the range of 55, it is added to the look-up table (LUT) 18. The LUT 18 is an input / output conversion table in which an output value corresponding to a digital value of an input signal is stored in advance, and a conversion function for matching the output characteristic of the first position detector 16 with a reference zoom function serving as a reference. have. The zoom position data corrected by the LUT 18 is added to a comparator 30 and a subtractor 32, which will be described later, and is notified to the MPU 34. The LUT 18 will be described later.

The focus lens control system includes a motor 66 for driving the focus lens 43 in the front-back direction, a motor drive circuit (motor driver) 67 for operating the motor 66, and a sensor for detecting the position of the focus lens. The motor driver 67 is controlled based on an auto-focus (AF) unit (not shown) to drive the focus lens 43 to focus, and
The focus lens 43 is driven so that a focused state can be obtained according to the position of the variable power lens 12. Then, the sensor 68 detects the position of the focus lens 43 and notifies the MPU 34 as focus position data.

Next, the image pickup system of the video camera 1 will be described. This image pickup system includes a CCD 45, a CCD drive circuit (driver) 46, a CDS circuit 47, a reference signal generator (SSG) 49, and an auto gain controller (AGC).
82, AD converter 83, electronic zoom circuit 84, DA
It is composed of a converter 85 and the like.

The subject light that has passed through the lens system described above is
An image is formed 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 light. The R, G, and B charges are read by a read pulse applied from the CCD drive circuit 46, separated by the CDS circuit 47, the gain is adjusted by the AGC 82, and digitized by the AD converter 83. The digitized image signal is subjected to known signal processing (not shown), and then the image magnification is adjusted by the electronic zoom circuit 84, and the DA converter 8
It is output as a video signal after passing through 5. Timing signals from the SSG 49 are applied to the CCD drive circuit 46 and the CDS circuit 47, respectively, so that the respective circuits are synchronized.

The electronic zoom circuit 84 includes an arithmetic processing unit, an image memory and the like, and electronically controls the read address in the image memory for storing digital image signals for one screen and interpolates the read digital image signals. The screen is scaled up and down. In the present embodiment, the electronic zoom magnification of the left camera is set to a fixed value of about 1.1 times, for example.

On the other hand, for the video camera 2 on the right side,
The lens system comprises a fixed lens 52, a variable power lens 22, and a focus lens 53. The lens control system controls the zoom lens control system for driving the variable power lens 22 and a focus lens control system for driving the focus lens 53. The video camera 1 on the left side described above in that
Is the same as

The zoom lens control system on the right side includes a motor 72 for driving the variable power lens 22, a motor drive circuit (motor driver) 74 for operating the motor 72, and a first position for detecting the position of the variable power lens 22. 2 position detector 26
The first drive unit is similar to the above-described first drive unit except that the control method is different. That is, the motor driver 74
Is controlled based on the error between the left and right zoom positions detected by the comparator 30, and reduces the error in the zoom position caused by the movement of the left zoom lens that was driven in advance by operating the zoom switch 36. As described above, the variable power lens 22 is driven. In other words, with the left zoom lens on the master side and the right zoom lens on the slave side, the slave zoom lens 22 is made to follow the movement of the master zoom lens 12, thereby eliminating the error in the left and right photographing magnifications. It is extremely small. This control will be described later.

The second position detector 26 detects the position of the variable power lens 22 and outputs it as a zoom position voltage Vb. The zoom position voltage Vb is digitized by the AD converter 27 in the range of 0 to 255, and then the LUT.
28 and corrected. The LUT 28 is an input / output conversion table in which an output value corresponding to a digital value of an input signal is stored in advance, and a conversion function for matching the output characteristic of the second position detector 26 with a reference zoom function serving as a reference. have. As a result, the output characteristics of the first position detector 16 on the left side are aligned with the common reference zoom function.

The zoom position data corrected by the LUT 28 is added to the comparator 30 and the subtractor 32 and is also notified to the MPU 34. The focus lens control system on the right side includes a motor 76 that drives the focus lens 53 in the front-rear direction, and a motor drive circuit (motor driver) 77 that operates the motor 76. The motor driver 77 is controlled based on this to drive the focus lens 53 to be in focus, and also to drive the focus lens 53 so as to obtain a focus state according to the position of the variable power lens 22. And the sensor 78
Detects the position of the focus lens 53 and notifies the MPU 34 as focus position data.

Next, the image pickup system of the right camera will be described. This image pickup system is similar to the left side described above in that the CCD 5
5, CCD drive circuit (driver) 56, CDS circuit 5
7, a reference signal generator (SSG) 59, an automatic gain controller (AGC) 92, an AD converter 93, an electronic zoom circuit 94, a DA converter 95, and the like.

The difference from the configuration on the left side is that the electronic zoom circuit 94 is controlled according to the output of the subtractor 32 to correct the electronic zoom magnification. That is, the left-side image magnification is used as a reference, and the right-side image magnification is finely adjusted based on the difference between the left and right photographing magnifications. This electronic zoom magnification adjustment will be described later. Next, drive control of the right zoom lens will be described.

FIG. 2 qualitatively shows the output characteristics of the first and second position detectors. As shown in the figure, the first and second position detectors 16 and 26 output zoom position voltages corresponding to the positions of the variable power lenses 12 and 22, respectively. It is shown that the zoom position voltage is large when the variable power lenses 12 and 22 are on the wide side, and is small when the variable power lenses 12 and 22 are on the telephoto side.

FIG. 3 shows the output characteristics of the position detector in LU.
9 is a graph showing a method of correction using T. The graph of the curve shown on the right side of the figure shows the zoom position voltage directly output from the first position detector 16 (or the second position detector 26). As shown in the figure, the output of the zoom position voltage has a non-linear characteristic with respect to the zoom position between the wide end and the tele end. Such a non-linear detection characteristic is corrected by the LUT 18 (or LUT 28) so as to match the linear characteristic function (reference zoom function).

That is, the analog zoom position voltages output from the first position detectors 16 and 26 are first digitized by the AD converters 17 and 27 to obtain the zoom voltage AD value. Then, the zoom voltage AD value is set to LUT1.
The input / output relationship of the LUTs 18 and 28 is determined so that the output data is used as the input data of 8 and 28 and the output data is on the reference zoom function (see the graph on the left side of the figure). As a result, the left and right position detectors 16 and 26 have common linearity with respect to changes in the zoom positions of the variable power lenses 12 and 22.

FIG. 4 is a conceptual diagram of the LUT, and shows a state where the input digital value on the right side of the drawing is associated with the output data on the upper side of the drawing. This LUT is composed of individually rewritable memory elements, and the output characteristics of the position detector described above can be appropriately changed by changing the setting of this correspondence. FIG.
FIG. 3 is a block diagram showing a main part of a control system of a motor driver 74 that drives the right zoom lens 20 shown in FIG. 1.
The zoom position data corrected by the LUTs 18 and 28 shown in FIG.
When 0, the error between the left and right zoom positions is detected. At this time, for example, if the zoom position data on the master side (left side) is A and the zoom position data on the slave side (right side) is B, then in the case of A> B, the comparator 30 outputs a high (H) signal and a low (H) signal. L) signal is output and added to INA and INB of the motor driver 74, respectively.

When A = B, the comparator 30 outputs a low (L) signal and a low (L) signal, which are added to INA and INB of the motor driver 74, respectively.
In the case of B, a low (L) signal and a high (H) signal are output from the comparator 30, and the motor driver 74
Is added to INA and INB. FIG. 6 shows a motor driver 74
Is a truth table of the above, and 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.

When the input signals applied to the input terminals (INA, INB) are both low (L, L), the motor driver 7
From the 4 output terminals (OUTA, OUTB) respectively (L,
L) is output. In this case, the motor 72 is stopped.
When the input signals applied to the input terminals (INA, INB) are (L, H), respectively (L, H) are output from the output terminals (OUTA, OUTB) of the motor driver 74. 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 7
4 output terminals (OUTA, OUTB) respectively (H,
L) is output. In this case, the motor 72 is driven to the wide side. If the input signals applied to the input terminals (INA, INB) are (H, H), the motor driver 7
4 output terminals (OUTA, OUTB) respectively (H,
H) is output. In this case, the motor 72 is braked. The same applies to the motor driver 64. However, in order to reduce the left and right zoom position error, it is necessary to set the driving speed on the right side larger than the driving speed on the left side.

Next, the magnification correction of the right electronic zoom circuit will be described. FIG. 7 is a principal block diagram showing a specific configuration of the electronic zoom circuit 94. Electronic zoom circuit 84
Is mainly composed of a write buffer 102, a frame memory 104, a read buffer 106, a write address generation circuit 108, a read address generation circuit 110, a timing signal generation circuit (SSG) 112 and the like.

The image signal digitized by the AD converter 93 shown in FIG. 1 is sequentially input to the write buffer 102 via a digital signal processor (DSP) (not shown). The address of the image signal temporarily stored in the write buffer 102 is designated by the write address generation circuit 108, and S
Based on the write timing signal from SG112,
It is written in the frame memory 104. The image data written in the frame memory 104 is read according to the read address specified by the read address generation circuit 110, and is output to the DA converter 95 via the read buffer 106. The timing is adjusted by the SSG 112 so that the write operation and the read operation are alternately repeated. Further, when adding the read address to the frame memory, an enlarged screen or a reduced screen can be obtained by adjusting the read start address, the read timing, and the like. Various necessary calculations are performed by a calculation processing unit (not shown) or the MPU 34.

The feature of this embodiment is that the read address generating circuit 110 is controlled based on the output from the subtractor 32 shown in FIG. 1 to finely adjust the magnification of the screen on the right side. The subtractor 32 outputs a signal according to the difference between the left zoom position data corrected by the LUT 18 and the right zoom position data corrected by the LUT 28. LUTs 18, 28 as shown in FIG.
Thus, the output characteristics of the zoom position detectors 16 and 26 are made uniform, and the focal length error does not vary depending on the zoom position, so that the image magnification can be adjusted by the difference in zoom position.

When the photographing magnification of the right zoom lens 20 is smaller than the photographing magnification of the left zoom lens 10, the electronic zoom circuit 94 enlarges the screen according to the difference in the photographing magnification (zoom position difference), When the photographing magnification of the zoom lens 20 is larger than that of the left zoom lens 10, the electronic zoom circuit 94 reduces the screen to make the left and right image magnifications equal. Even if the right screen is reduced by electronic zoom when the right shooting magnification is larger than the left, the left electronic zoom ratio is 1.1x, which is slightly larger. There is no shortage of image information when reducing with.

According to the zoom lens driving device constructed as described above, when the zoom switch 36 is operated to issue a zooming command in the tele direction or the wide direction, the zoom lens on the left side (master side) is based on the command. 10 is driven. On the other hand, the right side (slave side) zoom lens 20 is driven based on the error between the left and right zoom positions,
Follow the zoom lens 10 on the master side. At this time, the output characteristics of the position detectors 16 and 26 for detecting the left and right zoom positions are corrected by the LUTs 18 and 28 so as to match the common reference zoom function having linearity. The variation of the error of the focal length is suppressed, and the error of the left and right photographing magnification due to the individual difference of the zoom lenses 10 and 20 is reduced.

Since the variable power lens 22 on the slave side is made to follow the variable power lens 12 on the master side based on the outputs of the position detectors 16 and 26, the left and right focal lengths are matched with high precision. be able to. Furthermore, L
The electronic zoom magnification on the slave side is controlled based on the zoom position data corrected by the UTs 18 and 28 so that the image magnification on the slave side matches the image magnification on the master side. Even a slight error of the photographing magnification during the follow-up drive of 22 can be eliminated on the image. As a result, the left and right image magnifications can be matched with each other with high accuracy even during zoom driving of the zoom lens.

In the above embodiment, two LUTs are provided,
The case where the output characteristics of the two position detectors are converted into a common reference zoom function has been described, but a mode in which one LUT is configured is also possible. That is, in the zoom lens driving device shown in FIG. 1, one zoom position detection characteristic is used as a reference and only the other zoom position detection characteristic is set to L
It may be corrected by the UT and aligned on the reference side.

FIG. 7 shows a method in which the output characteristic of the second position detector 26 (slave side) is corrected to match the output characteristic of the first position detector 16 (master side) when there is one LUT. It is a graph shown. The curve graph shown on the upper right side of the figure shows the zoom data that is output directly from the master position detector, and the curve graph shown on the lower right side of the figure is output directly from the slave position detector. The zoom data is shown.

The analog zoom position voltage output from the position detector 26 on the slave side is converted into an AD converter 27.
Digitize to obtain the zoom voltage AD value. Then, using the zoom voltage AD value as input data of the LUT, the input / output relationship of the LUT 28 is determined so that the output data matches the zoom data on the master side, and stored in advance (see the graph on the left side of the figure). . As a result, the left and right position detectors have common output characteristics with respect to changes in the zoom positions of the respective variable power lenses 12 and 22, and the error in the imaging magnification caused by the individual difference between the left and right zoom lenses is eliminated. It can be reduced.

In the above embodiment, the case where the output characteristics of the zoom position detectors 16 and 26 are made common by using the LUT has been described, but the output characteristics of the zoom position detector are sufficiently linear. However, if the individual difference is negligible, it may be considered not to use the LUT.

[0044]

As described above, according to the zoom lens driving device of the present invention, of the two left and right zoom lenses, the first zoom lens is moved in the tele direction or the wide direction by operating the zoom switch. The second zoom lens is driven so that the left and right zoom magnifications match based on the zoom position data indicating the shooting magnifications of the left and right zoom lenses. Since the image magnification of (1) is electrically adjusted so as to match the other image magnification, it is possible to drive the left and right zoom lenses so as to match the shooting magnification with high accuracy, and at the same time, the second Even a slight error in the photographing magnification while the zoom lens is following can be eliminated on the image.

Further, since the zoom position data of at least one of the position detectors for detecting the left and right zoom positions is corrected by the look-up table so that the output characteristics of both are made uniform, it depends on the zoom position. It is possible to suppress the fluctuation of the error of the focal length, and reduce the error of the left and right photographing magnification due to the individual difference of the zoom lens. Then, based on the zoom position data corrected by the look-up table, one image magnification is electrically scaled so as to match the other image magnification. Can be matched with, and a good stereoscopic image can be captured.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a driving device of a 3D zoom lens to which the present invention is applied.

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

FIG. 3 is a graph showing a method of correcting the output characteristic of the position detector using the LUT.

FIG. 4 is an explanatory diagram of a lookup table.

FIG. 5 is a block diagram showing a main part of a control system of a motor driver 74.

FIG. 6 Truth table of motor driver

FIG. 7 is a block diagram showing a configuration of an electronic zoom circuit.

FIG. 8 is a graph showing a method of correcting the output characteristic of the second position detector when the number of lookup tables is one.

FIG. 9 is a configuration diagram of a conventional 3D zoom lens driving device.

[Explanation of symbols]

 10, 20 ... Zoom lens 12, 22 ... Variable magnification lens 16 ... First position detector 17, 27 ... AD converter 18, 28 ... Look-up table (LUT) 26 ... Second position detector 30 ... Comparator 32 ... Subtractor 34 ... Micro processing unit (MPU) 36 ... Zoom switch 62, 72 ... Motor 64, 74 ... Motor driver

Claims (2)

[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 position data detected by the first and second detection means, the shooting magnification of the second zoom lens matches the shooting magnification of the first zoom lens. Second driving means for driving the second zoom lens, and first and second images for capturing the subject images that have passed through the first and second zoom lenses, respectively. Of the pair of images captured by the first and second image capturing means, and one of the image magnifications is detected by the first and second detecting means so as to match the other image magnification. A zoom lens drive device, comprising: an electronic zoom unit that electrically expands and contracts based on zoom position data. 2. A zoom lens drive 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 drive means for driving the first zoom lens in the tele direction or in the wide direction by operating a zoom switch, and a zoom position indicating a photographing magnification of each of the first and second zoom lenses are detected, and the detection is performed. The first and second detecting means for digitizing and outputting the zoom position data, and the zoom position data of at least one of the first and second detecting means are input, and the digital value of the input signal is input. At least one look-up function that stores the corresponding output value in advance and corrects it so that the zoom position detection characteristics of the first and second detection means are matched. A table, and a photographing magnification of the second zoom lens, which is detected by the first and second detecting means and corrected by the look-up table, based on zoom position data, and a photographing magnification of the first zoom lens. Second driving means for driving the second zoom lens so that they coincide with each other; first and second imaging means for respectively capturing subject images that have passed through the first and second zoom lenses; Based on the zoom position data detected by the first and second detection means, one of the pair of images picked up by the first and second image pickup means is matched with the other image magnification. A zoom lens driving device comprising: an electronic zooming unit that expands and contracts dynamically.