JP4129411B2 - Lens position detection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lens apparatus having a lens magnification or shooting distance changing function, and more particularly, to a lens position detection apparatus suitable for detecting a lens position during autofocusing in the lens apparatus.
[0002]
[Prior art]
In a conventional camera autofocus system (hereinafter referred to as “AFS”), various methods are used as means for detecting a lens position.
As the simplest method, there is a method of detecting the lens position by detecting the rotational speed of the driving motor. In this method, a pulse signal is generated by a disc-shaped slit plate and a photo interrupter in the middle of the gear train transmitted from the motor output shaft to the lens moving frame, and the lens position is detected by counting the number of pulses. Yes (Patent Document 1).
In addition, a light emitting element and a light receiving element are arranged in the fixed frame part of the lens barrel, a diffraction grating is arranged in the moving frame part, a pulse signal is generated, and the number of pulses is counted to detect the lens position. Is also disclosed (Patent Document 2).
[Patent Document 1]
JP-A-1-217408 [Patent Document 2]
Japanese Patent Laid-Open No. 2-77708
In the former method of detecting the motor rotation speed, since a large number of gears are involved, followability becomes a problem, and an accurate lens position cannot always be detected. In addition, the latter method using a light emitting / receiving component and a diffraction grating has a problem in that it depends on the processing accuracy of the diffraction grating in order to detect the lens position with high accuracy, resulting in manufacturing difficulties. .
In these methods, the lens position is detected by counting pulses together, and is not a method for detecting the absolute position of the lens. Therefore, the conventional lens position detection device requires a separate mechanism for detecting the absolute position of the lens, which increases the cost in addition to the complexity of the mechanism. Further, in the conventional method, when a pulse count error occurs once due to dust or the like, the lens position detection becomes a false detection and becomes fatal.
Further, the generated pulse must be constantly monitored by the lens movement control system, and the high-precision control in the lens movement depends on the calculation speed of the control system.
[0004]
[Problems to be solved by the invention]
Therefore, there is a demand for a lens position detection device that can detect the absolute position of the lens with high accuracy and a compact mechanism.
Based on this request, the present inventor invented the absolute position detection of the lens using a planar inductor and a conductive material. Here, the measurement range of the lens position depends on the surface area of the planar inductor, and the area of the planar inductor must be increased in order to ensure a large lens position measurement range. However, since the lens device itself is required to be compact, when it is adopted, the lens moving frame is limited to a small movement.
For example, when the surface area of the planar inductor is about 10 × 10 mm, the movement measurement range is about 10 mm, and it is not possible to cope with lens movement beyond that. This can be dealt with by increasing the surface area of the planar inductor, but the lens device also becomes larger.
Therefore, there is a limit in achieving accurate position detection while maintaining compactness in a lens apparatus having a large zooming ratio.
SUMMARY OF THE INVENTION The present invention meets the above requirements, and its purpose is to accurately detect the absolute position of the lens while maintaining compactness, and to maintain the compactness even when the zooming ratio is large and the lens moving distance is large. An object of the present invention is to provide a lens position detection device capable of expanding the position measurement range.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a lens apparatus capable of moving the lens moving frame in the optical axis direction with respect to the fixed frame for changing the lens magnification or the shooting distance, and either the lens moving frame or the fixed frame. A planar inductor member, a conductive member on the other side, means for changing the distance between the planar inductor member and the conductive member as the lens moving frame moves, and movement of the lens by a change in electrical signal output from the planar inductor member And a lens position detection circuit for detecting the position.
According to the present invention, in the above configuration, the means for changing the distance between the planar inductor member and the conductive member has a rotating frame that rotates in conjunction with the movement of the lens moving frame, and the rotating frame is inclined in the optical axis direction. And a planar inductor member that faces the conductive surface is provided on the fixed frame, and the distance between the planar inductor member and the conductive surface is changed when the rotating frame is rotated by the movement of the lens moving frame. Configure.
Furthermore, the present invention is capable of moving the lens moving frame in the optical axis direction with respect to the fixed frame for changing the lens magnification or the shooting distance, a planar inductor member on one of the lens moving frame and the fixed frame, and a conductive member on the other A lens position detecting device for detecting a movement position of a lens by obtaining a change in electric signal output from the planar inductor member according to a change in distance between the planar inductor member and the conductive member, wherein the planar inductor is mounted on the fixed frame. When a member or a conductive member is provided, a conductive member or a planar inductor member is provided on the lens moving frame with a planar inductor member or a conductive member of the fixed frame interposed therebetween, and a planar inductor member or a conductive member is provided on the lens moving frame. Is a conductive member or a plane sandwiching the plane inductor member or conductive member of the lens moving frame with the fixed frame A switching circuit for providing an inductor member and switching an electrical signal extracted from one planar inductor member from the other planar inductor member according to the position of the sandwiched conductive member or planar inductor member; and a planar inductor member And a lens position detection circuit that detects a lens position based on a change in an electrical signal output from the lens.
Furthermore, the present invention has two or more lens moving frames with respect to the fixed frame for changing the lens magnification or shooting distance, and each lens moving frame is a lens barrel that is movable in the optical axis direction. Each moving frame is provided with a conductive member and a planar inductor member, and a lens position is detected by a change in electrical signal output from the planar inductor member of each lens moving frame with respect to a change in distance between the lens moving frames. It has a lens position detection circuit, and detects the position of each lens moving frame.
The planar inductor member and the conductive member of each lens moving frame can be integrally formed by laminating the planar inductor portion, the insulating layer, and the conductive layer.
In the lens position detection circuit according to the present invention, the frequency or voltage changes with respect to the inductance change due to the movement of the lens moving frame, and the lens position information is based on the relationship between the frequency or voltage and the distance between the planar inductor member and the conductive member. Can be configured to output.
[0007]
[Action]
According to the above configuration, a compact lens position detection device with good productivity can be realized.
In addition, the absolute position of the lens can be detected in a compact and accurate manner even for a large moving distance of the lens moving frame.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional view showing an embodiment of a lens position detecting apparatus employing a lens position detecting apparatus according to the present invention.
In the figure, 2 is a distance display ring, 3 is a ball, 4 is a focus lever, 5 is a gear unit, 6 is a cam boss, 7 is a focus ring, 8 is a front holding ring, 9 is a filter frame, 10 is a name ring, 11 is The cam frame, 12 is a fixed frame, 13 is a moving frame unit, 14 is a rear decorative ring, 15 is an electrical contact, 16 is a mounting frame, 17 is an aperture ring, 18 is a connecting gear, 19 is a planar inductor, and 20 is a conductive member. is there.
[0009]
Next, the operation of the lens position detection device will be described.
Although this embodiment is a single focus lens, a similar mechanism can be arranged also in a zoom lens. First, the operation of the entire lens will be described with reference to the schematic diagram of FIG.
The bayonet-shaped mount frame 16 is coupled to a camera body mount (not shown). At this time, the electrical contact 15 and the contact of the camera are electrically connected, the power is turned on to the lens, and the photographing operation is started.
[0010]
The photographer selects manual focus or auto focus as a focus operation with a switch on the camera body side. Next, when a desired subject is placed in the lens, the photographer rotates the focus ring 7 in the manual focus mode. The rotation of the focus ring 7 rotates the distance display ring 2 via the gear unit 5.
A focus lever 4 is attached to the distance display ring 2, and the cam frame 11 is rotated by the rotation of the distance display ring 2. The cam frame 11 is provided with a cam groove 11a in a spiral shape, and cam bosses 6 are attached to the lens moving frame unit 13 at three positions at equal angles. The cam boss 6 is engaged with the spiral cam groove, and the fixed frame 12 fitted to the outside of the moving frame unit 13 is formed with a straight guide groove 12a in the optical axis direction. 6 is engaged, the rotation of the cam frame 11 is converted to the straight direction, and the lens moving frame unit 13 can move back and forth on the optical axis.
The operation of the distance display ring 1 and the lens moving frame unit 13 is linked by the above mechanism.
[0011]
When the photographer selects the autofocus mode, a motor (not shown) is driven to rotate, and a rotational force is transmitted to the gear unit 5 via a gear train (not shown) and the connecting gear 18. In this case, the gear unit 5 rotates the distance display ring 1 without rotating the focus ring 7. The subsequent operations are the same as in the manual focus mode.
FIG. 1A shows a partial detailed view of the interlocking from the focus ring to the lens moving frame unit and the autofocus interlocking mechanism part.
The embodiment of the present invention shown in FIG. 1 shows an example in which manual focus and autofocus mode selection is switched using a gear unit 5 employing a differential mechanism. Mode selection is also possible by switching.
[0012]
FIG. 2 is a perspective view showing a positional relationship between a conductive member provided on the lens moving frame unit and the fixed frame of FIG. 1 and a planar conductor member.
A conductive member fitting groove 22 is formed in the fixed frame 12 in the optical axis direction, and the conductive member 20 fixed to the lens moving frame unit 13 moves back and forth in the conductive member fitting groove 22. A planar conductor 19 is provided at the end of the conductive member fitting groove 22.
[0013]
FIG. 3 is a diagram for explaining an example of the shape of the planar inductor member.
(A) is a rectangular spiral shape, (b) is a meander shape, and (c) is an elliptical spiral shape. Thus, it can be made into various shapes and has a different inductance change rate for each shape. Each of these shapes can be formed by printing a conductor pattern on an insulating substrate.
[0014]
FIG. 4 is a block diagram showing an embodiment of the circuit of FIG.
During autofocus, the lens moving frame unit 13 is moved according to the subject distance. The amount of movement of the lens moving frame unit 13 is determined by detecting and calculating the defocus of the subject image incident through the lens with a camera (not shown). The camera MPU 27 controls the lens driving circuit 28 and moves the lens moving frame unit 13 by driving the motor 29.
As a result, the distance between the planar inductor 19 attached to the fixed frame 12 and the conductive member 20 of the lens moving frame unit 13 changes, and the frequency (voltage change also occurs) generated in the planar inductor 19 due to the inductance change of the planar inductor 19. ) Changes. This frequency change is detected by the frequency change detector 25 and sent to the position information output unit 26. The position information output unit 26 outputs information indicating the distance between the planar inductor 19 and the conductive member 20 corresponding to the frequency. The MPU 27 of the camera knows the current position of the lens from this information and performs autofocus control.
[0015]
This circuit example is an example of an autofocus operation. In the case of manual focus, the amount by which the distance ring is operated is similarly detected and transmitted to the camera MPU 27 by the frequency change detector 25 and the position information output unit 26. The lens position can be displayed on a display unit (not shown).
[0016]
The detection principle of the planar inductor 19 and the conductive material 20 as lens position detection means will be described with reference to FIG.
When an AC voltage is applied to the planar inductor 19, an AC magnetic field is generated in the planar inductor 19 and an eddy current is generated in the conductive material 20.
Thereby, the planar inductor 19 and the conductive material 20 are electromagnetically coupled. Further, the planar inductor 19 and the conductive material 20 are also electrostatically coupled to form a capacitor. The electromagnetic coupling or the electrostatic coupling differs depending on the line width and shape of the planar inductor 19 as shown in FIG. Therefore, characteristics suitable for the measurement system can be obtained by adjusting these.
If the distance between the planar inductor 19 and the conductive material 20 decreases, the inductance decreases, and if the distance increases, the inductance increases. Therefore, this change may be detected as a voltage or frequency change. The example of FIG. 4 is detected as a frequency change.
[0017]
The relationship between the voltage or frequency change obtained as described above and the distance is non-linear, and the change rapidly decreases as the distance increases.
The relationship between the voltage or frequency change and the distance increases depending on the surface area of the planar inductor and the conductive material. However, in the case of a realistic dimension, for example, a surface area of φ10 mm, the detection limit distance range is about 10 mm. The lens movement amount for AF is restricted to 10 mm or less. However, if the camera unit is a compact camera, the detection distance range is sufficient.
On the other hand, 10 mm is often insufficient for detecting the zoom operation or moving the AF lens of the interchangeable lens. Therefore, the amount of lens movement is detected by a planar inductor and conductive member provided near an infinite position, and when the conductive member reaches an intermediate distance, it is switched to the other planar inductor side, and closer to the other planar inductor and conductive member. A configuration for detecting distances can be used (described in FIG. 7).
[0018]
6A and 6B are diagrams for explaining another embodiment of the planar inductor and the conductive member (conductive surface). FIG. 6A is a perspective view of the rotating frame, and FIG. 6B is a plan view of the rotating frame.
An inclined surface is formed along the ring surface of the lens moving frame unit 31, and a conductive surface 32 is provided on the inclined surface. The planar inductor 33 is attached to a fixed frame (not shown) so as to face the conductive surface 32. By providing the conductive surface 32 on the inclined surface in this way, the distance between the lens moving frame unit 31 and the planar inductor 33 can be increased by the rotation of the lens moving frame unit 31 without providing the conductive surface 32 in the linearly moving portion of the lens moving frame unit 31. Can be changed.
[0019]
FIG. 7 is a cross-sectional view showing an embodiment of another lens position detection apparatus employing the lens position detection apparatus according to the present invention, and the same reference numerals are given to the portions that perform the same functions as those in FIG. FIG. 8 is a detailed view showing the positional relationship between the conductive member attached to the lens moving frame and the planar inductor attached to the fixed frame.
In this embodiment, two planar inductors 19 and 35 are provided on the fixed frame 12 so as to sandwich the conductive member 21 with respect to the conductive member 21 of the lens moving frame unit 13. That is, the planar inductors 35 and 19 are provided at the left end and the right end of the conductive member fitting groove 22, respectively.
When the conductive member 21 is moved to the right side of the center of the conductive member fitting groove 22, the planar inductor 19 detects it, and when the conductive member 21 is moved to the left side of the center, the planar inductor 35 detects it. Switching is performed so that the planar inductor on the opposite side detects at the center position of the conductive member fitting groove 22.
[0020]
FIG. 9 is a diagram for explaining another example of the combination of the conductive member and the planar conductor member with respect to the lens moving frame and the fixed frame.
(A) provides the planar inductor A in the lens moving frame unit 13, arrange | positions conductive member B1, B2 in the groove end of the fixed frame 12 so that this may be pinched | interposed, and moves the planar inductor A. FIG. The planar inductor A is formed with an inductor having a pattern as shown in FIG. 3 on both sides, and when the output is taken out from each inductor and moved to an intermediate position between the conductive members B1 and B2, the output is switched to the other inductor side. It is done.
(B) is a plan view in which the planar inductor A is provided on the fixed frame 23, and the conductive members B1 and B2 are arranged on the lens moving frame unit 24 so as to sandwich the planar inductor A, and the two conductive members B1 and B2 are moved. . The planar inductor A is also formed with an inductor having a pattern as shown in FIG. 3 on both surfaces, and outputs are taken out from the respective inductors. The lens moving unit 24 moves to bring the planar inductor A to an intermediate position between the conductive members B1 and B2. When it becomes, it is switched to the other inductor side.
(C) is a structure in which a conductive member is provided on the fixed frame 23, and the planar inductors A1 and A2 are arranged on the lens moving frame unit 24 so as to sandwich the conductive member, and the two planar inductors A1 and A2 are moved. When the lens moving unit 24 moves and the conductive member B reaches the intermediate position between the planar inductors A1 and A2, it is switched to the other inductor side.
With the above configuration, it is possible to ensure a lens position detection range of 20 mm.
[0021]
FIG. 10 is a block diagram showing an embodiment of the circuit of FIG.
In this figure, the frequency change detector 25, the position information output unit 26, the camera MPU 27, the lens driving circuit 28, and the motor 29, which have the same reference numerals as those in FIG. 4, perform the same circuit functions. One end of the two planar conductors 19 and 35 of the fixed member 12 is connected to the switching circuit 41 with respect to the conductive member 21 of the lens moving unit 13.
The switching circuit 41 is a circuit that switches the outputs of the planar inductors 19 and 35 and sends them to the frequency change detector 25. For example, the switching circuit 41 is switched to the output of the planar inductor 19. The position information output from the position information output unit 26 is set to 0 mm for the position where the conductive member 21 is closest to the planar inductor 19 and 10 mm to the intermediate position. When the conductive member 21 is about 10 mm or more due to the movement of the lens moving unit 13, the switching circuit 41 is switched to the output of the planar inductor 35.
Position information by the planar inductor 35 is obtained in a region of 10 mm or more, and when the position information output unit 26 moves to the left side from the intermediate position, it outputs position information obtained by adding 10 mm to the movement relative to the planar inductor 35 (up to 10 mm).
[0022]
FIG. 11 is a block diagram showing an embodiment of a circuit when a planar inductor is provided in the lens moving frame.
This embodiment is an example of a conductive member in which planar inductors having the pattern of FIG. 3 are provided on both surfaces of a substrate. When the lens moving frame unit 13 comes to an intermediate position between the conductive members 50 and 51, the outputs of the planar conductors 52 and 53 are replaced by the switching circuit 41. Other configurations and operations are the same as those in FIG.
[0023]
FIG. 12 is a cross-sectional view showing an embodiment of still another lens position detecting apparatus employing the lens position detecting apparatus according to the present invention.
This embodiment detects a large number of lens moving frame positions that move relative to each other. A lens 57 is attached to the first lens moving frame 51, a lens 58 is attached to the second lens moving frame 52, and a lens 54 is attached to the third lens moving frame 53. The lens moving frames 51, 52, and 53 each have an axis. 60 and 61 are slidably mounted in the optical axis direction. The lens moving frames 51, 52 and 53 are provided with detection sensors 54, 55 and 56 each including a planar inductor portion, an insulating layer and a conductive surface as shown in FIG. Outputs are taken from the sensors 54, 55 and 56.
[0024]
FIG. 13 is a block diagram showing an embodiment of the circuit of FIG.
By the conductive member 54b of the detection sensor 54 and the planar inductor 63b of the fixed frame 63, by the conductive member 55b of the detection sensor 55 and the planar inductor 54a of the detection sensor 54, by the conductive member 56b of the detection sensor 56 and by the planar inductor 55a of the detection sensor 55. A pair of distance sensors is formed by the conductive member 63 a of the fixed frame 63 and the planar inductor 56 a of the detection sensor 56.
The outputs of the planar inductors 54a, 55a, 56a and 63b are connected to the time division circuit 64. The time division circuit 64 takes in the output of each planar inductor at regular intervals, and sequentially sends the output of each planar inductor to the frequency conversion detector 65. The position information output unit 66 can obtain the distance between each planar inductor and the conductive member by referring to the graph shown in FIG.
[0025]
The MPU 67 of the camera knows the current position of the lens from this information and performs autofocus control. For example, when the MPU 67 of the camera indicates the current lens position in the left direction with respect to the position of the planar inductor 63b, the position of the first lens moving frame 54 can be obtained from the output of the planar inductor 63b.
The position of the second lens moving frame 55 can be obtained by obtaining the distance between the second lens moving frame 55 and the first lens moving frame 54 with the planar inductor 55a and adding the position of the first lens moving frame 54 thereto. .
The position of the third lens moving frame 56 can be obtained by obtaining the distance between the third lens moving frame 56 and the second lens moving frame 55 by the planar inductor 56a and adding the position of the second lens moving frame 55 to the distance. Photometric data for autofocusing is obtained with respect to the position of each lens moving frame obtained in this way, the amount of movement of each lens moving frame is determined, the lens driving circuit 68 is controlled, and the motor 67 is driven to drive the motor. By switching the output with the switching mechanism, each lens moving frame can be individually driven and controlled.
[0026]
Although the above description of the operation has been made at the time of AF, it can be performed at the time of MF (manual focus), or the same effect can be obtained even if this is used for lens movement by zooming.
[0027]
【The invention's effect】
As described above, according to the present invention, the absolute position of the lens can be detected with high accuracy while maintaining compactness. Further, even in a lens apparatus in which the zooming ratio is large and the lens moving distance is large, the absolute position of the lens can be detected by expanding the measurement range of the lens position while maintaining compactness.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of a lens position detection apparatus employing a lens position detection apparatus according to the present invention.
FIG. 1A is a partial detail view of an interlocking and autofocus interlocking mechanism portion from a focus ring to a lens moving frame unit.
2 is a perspective view showing a positional relationship between a conductive member provided on the lens moving frame and the fixed frame of FIG. 1 and a planar conductor member. FIG.
3A and 3B are diagrams showing the shape of a planar inductor member, in which FIG. 3A is an example of a square spiral type, FIG. 3B is a meander type, and FIG. 3C is an example of an elliptical spiral type. .
4 is a block diagram illustrating an embodiment of the circuit of FIG. 1. FIG.
FIG. 5 is a graph showing a positional relationship between a frequency change due to an inductance change and an interval between a conductive member and a planar inductor member.
6A and 6B are diagrams for explaining another embodiment of the planar inductor and the conductive member (conductive surface), in which FIG. 6A is a perspective view of the rotating frame, and FIG. 6B is a plan view of the rotating frame.
FIG. 7 is a cross-sectional view showing an embodiment of another lens position detection apparatus employing the lens position detection apparatus according to the present invention.
8 is a detailed view showing a positional relationship between a conductive member attached to the lens moving frame of FIG. 7 and a planar inductor attached to the fixed frame.
FIG. 9 is a diagram for explaining an example of another combination of a conductive member and a planar inductor member with respect to a lens moving frame and a fixed frame.
FIG. 10 is a block diagram showing an embodiment of the circuit of FIG.
FIG. 11 is a block diagram showing an embodiment of a circuit when a planar inductor is provided in a lens moving frame.
FIG. 12 is a cross-sectional view showing still another embodiment of the lens position detecting device employing the lens position detecting device according to the present invention.
13 is a block diagram showing an embodiment of the circuit of FIG.
14 is a view showing an example in which the planar inductor member and the conductive member of FIG. 12 are integrally formed.
[Explanation of symbols]
2 Distance display ring 3 Ball 4 Focus lever 5 Gear unit 6 Cam boss 7 Focus ring 8 Front holding ring 9 Filter frame 10 Name ring 11 Cam frame 12 Fixed frame 13 Lens moving frame unit 14 Rear decorative ring 15 Electrical contact 16 Mount frame 17 Aperture Ring 18 Connection gear 19 Planar inductor 20 Conductive member 22 Conductive member fitting groove 25 Frequency change detector 26 Position information output unit 27 Camera MPU
28 Lens drive circuit 29 Motor

Claims (6)

In a lens device capable of moving the lens moving frame in the optical axis direction with respect to the fixed frame for changing the lens magnification or shooting distance,
A planar inductor member is provided on one of the lens moving frame and the fixed frame, and a conductive member is provided on the other.
Means for changing the distance between the planar inductor member and the conductive member as the lens moving frame moves;
A lens position detection circuit for detecting a moving position of the lens by an electric signal change output from the planar inductor member;
A lens position detection device comprising: Means for changing the distance between the planar inductor member and the conductive member,
A rotating frame that rotates in conjunction with the movement of the lens moving frame, a conductive surface inclined in the optical axis direction is provided on the rotating frame, and a planar inductor member is provided on the fixed frame to face the conductive surface;
2. The lens position detecting device according to claim 1, wherein the distance between the planar inductor member and the conductive surface is changed when the rotating frame is rotated by the movement of the lens moving frame. The lens moving frame can be moved in the optical axis direction with respect to the fixed frame to change the lens magnification or shooting distance, and a planar inductor member is attached to one of the lens moving frame and the fixed frame, and a conductive member is attached to the other, and the plane A lens position detection device that detects a movement position of a lens by obtaining an electric signal change output from the planar inductor member by a change in distance between an inductor member and a conductive member,
When providing a planar inductor member or a conductive member on the fixed frame, a conductive member or a planar inductor member is provided on the lens moving frame with the planar inductor member or the conductive member of the fixed frame interposed therebetween,
When providing a planar inductor member or a conductive member on the lens moving frame, a conductive member or a planar inductor member is provided on the fixed frame with the planar inductor member or conductive member of the lens moving frame interposed therebetween,
A switching circuit that switches an electrical signal taken out from one planar inductor member to be taken out from the other planar inductor member according to the position of the sandwiched conductive member or planar inductor member;
A lens position detection circuit for detecting a lens position by an electric signal change output from the planar inductor member;
A lens position detection device comprising: There are two or more lens movement frames for the fixed frame for changing the lens magnification or shooting distance, and each lens movement frame is a lens barrel that is movable in the optical axis direction.
A conductive member and a planar inductor member are provided on each of the two or more lens moving frames;
A lens position detection circuit for detecting a lens position by a change in an electric signal output from a planar inductor member of each lens movement frame with respect to a distance change between the lens movement frames;
A lens position detecting device for detecting a position of each lens moving frame. 5. The lens position detecting device according to claim 4, wherein the planar inductor member and the conductive member of each lens moving frame are integrally formed by laminating a planar inductor portion, an insulating layer, and a conductive layer. The lens position detection circuit changes a frequency or a voltage with respect to an inductance change due to the movement of the lens moving frame, and outputs lens position information according to a relationship between the frequency or the voltage and a distance between the planar inductor member and the conductive member. The lens position detection device according to claim 1, wherein

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