JP2007225768A - Lens position adjusting method and lens position adjusting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens position adjusting method and a lens position adjusting apparatus for highly accurately adjusting the position of a microlens without using tools such as a centering pin and a washer. <P>SOLUTION: The lens position adjusting method comprises: a step for fixing an adjustment lens whose position is adjusted related to a fixed lens to an adjustment lens frame composed of a magnetic material; a movable supporting step for supporting the adjustment lens frame on a fixed lens frame that holds the fixed lens so that the adjustment lens frame can move at least in a direction orthogonal to the optical axis; a position adjusting step for moving the adjustment lens frame relatively with the fixed lens frame by using a magnetic force working between the adjustment lens frame and a position setting magnetic field generating means; and a step for fixing the position-adjusted adjustment lens frame and the fixed lens frame. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a lens position adjusting method and a lens position adjusting apparatus.

Currently, digital cameras are becoming smaller and higher resolution, and photographic lens systems are also required to be smaller and higher resolution. In such a photographic lens system, it is necessary to adjust the decentering amount and focus of the optical axis with high accuracy, and it will not be possible to obtain an image with a balanced contrast and without tilting. Accuracy error may affect optical performance. Therefore, an adjustment operation that defines a favorable positional relationship between the lenses is necessary. In this adjustment operation, a jig such as an alignment pin is used for adjustment in the direction perpendicular to the optical axis, and a jig such as a washer is used for adjustment in the optical axis direction. The adjustment operation is completed by fixing the lenses (lens frames) with an adhesive or the like.

However, it has been difficult to precisely adjust the position of the photographic lens system using jigs such as alignment pins and washers.

The present invention provides a lens position adjusting method for adjusting the position of a minute lens with high accuracy without using a jig such as an alignment pin and a washer, and a lens position adjusting device for executing this position adjusting method. For the purpose.

The lens position adjustment method of the present invention includes a step of fixing an adjustment lens, which is adjusted relative to a fixed lens, to an adjustment lens frame made of a magnetic material, and the adjustment on the fixed lens frame holding the fixed lens. A movable support step for movably supporting the lens barrel, and a magnetic force acting between the adjustment lens barrel and the position setting magnetic field generating means, the adjustment lens barrel is fixed to the fixed lens barrel. And a position adjusting step of relative movement, and a step of fixing the adjusted adjustment lens barrel and the fixed lens barrel.

In the movable support step, it is preferable to move the position of the adjustment lens frame so that the adjustment lens optical axis matches the fixed lens optical axis as much as possible.

Further, in the movable support step, the adjustment lens frame is also movably supported in the optical axis direction with respect to the fixed lens frame, and in the position adjustment step, the magnetic force acting between the adjustment lens frame and the position setting magnetic field generating means. It is preferable that the position of the adjustment lens barrel in the optical axis direction is also adjusted by the force.

The position setting magnetic field generating means is preferably a position adjusting electromagnet arranged on the outer side of the adjustment lens barrel in a non-contact manner at intervals in the circumferential direction.

The adjustment lens barrel is preferably magnetized in the circumferential direction.

The fixed lens frame is also preferably made of a magnetic material, and the fixed lens frame and the adjustment lens frame are preferably magnetized so as to be attracted to each other.

The lens position adjustment device of the present invention uses a fixed lens frame that holds a fixed lens, an adjustment lens frame that fixes an adjustment lens that is positioned on the fixed lens, and a magnetic force that acts on the adjustment lens frame. And a position setting magnetic field generating means for moving the adjusting lens frame relative to the fixed lens frame at least in a direction perpendicular to the optical axis.

It is preferable that the adjustment lens barrel of the lens position adjusting device is also adjusted to a position in the optical axis direction.

The lens position adjusting device according to the present invention is a lens position adjusting device that aligns the optical axis of the adjusting lens with the optical axis of the fixed lens, and is adjusted in position with respect to the fixed lens frame that holds the fixed lens and the fixed lens. An adjustment lens barrel made of a magnetic material that holds the adjustment lens, and a plurality of position setting magnetic field generating means that are arranged around the adjustment lens barrel and generate a magnetic force on the adjustment lens barrel. The adjustment lens position is adjusted by moving the position of the adjustment lens frame relative to the fixed lens frame by the magnetic force of the setting magnetic field generating means.

It is preferable that at least three position setting magnetic field generating means are arranged at equal angular intervals on a virtual circle obtained by rotating around the optical axis of the fixed lens of the fixed lens barrel.

The position of the center of the virtual circle in the direction of the optical axis is within the range in which the adjustment lens barrel is disposed, and the lines of magnetic force going straight from the position setting magnetic field generating means are orthogonal to the optical axis of the fixed lens and intersect each other. It is preferable.

It is preferable that the lines of magnetic force going straight from the position setting magnetic field generating means are directed from the virtual circle to the object side and within the range where the adjustment lens barrel is disposed, and intersect each other on the optical axis of the fixed lens.

A magnetic field for position setting on the image side is generated by placing the centers of the virtual circles on the object side and the image side, respectively, within the range where the adjustment lens barrel is placed and perpendicular to the optical axis of the fixed lens Magnetic field lines that go straight from the direction from the virtual circle on the image side to the object side, intersect with each other on the optical axis of the fixed lens within the range where the adjustment lens barrel is arranged, and generate a magnetic field for position setting on the object side It is preferable that the magnetic field lines going straight from the means are directed from the virtual circle on the object side to the image side and intersect each other on the optical axis of the fixed lens within the range where the adjustment lens barrel is arranged.

The position setting magnetic field generating means is preferably supplied with an alternating current.

Alternatively, the position setting magnetic field generating means can also apply a direct current.

The present invention can provide a lens position adjusting method and a lens position adjusting apparatus that adjust the position of a microlens with high accuracy without using a jig such as an alignment pin and a washer.

FIG. 1 shows a first embodiment of the lens position adjusting apparatus of the present invention. In this embodiment, the lens position adjusting device of the present invention is applied to the position adjustment of the lens of the digital camera 10, and the digital camera body 11 is fixed to a digital camera fixing base (not shown). The In the lens barrel (not shown) of the digital camera 10, an adjustment lens L1, a fixed lens L2a, and a fixed lens L2b are arranged in this order from the object side. The fixed lens L2a and the fixed lens L2b constitute a fixed lens group L2, and these optical axes are matched in advance and the focus is adjusted. A CCD (imaging device) 12 of the digital camera 10 is disposed on the image plane side of the fixed lens L2b. At the time of lens position adjustment, the CCD 12 is connected to the CPU 13 (FIG. 3), and the image signal of the CCD 12 is displayed on the display (display means) 14 via the CPU 13 (FIG. 3).

The adjustment lens L1 is fixed to a front circular cylindrical adjustment lens barrel 20 made of a magnetic material (for example, iron or plastic magnet). As shown in FIG. 2, the adjustment lens barrel 20 is magnetized in the circumferential direction.

The fixed lens group L2 is fixed (held) to a fixed lens barrel 30 having a circular front shape. The fixed lens barrel 30 is supported by the digital camera body 11, and a fitting groove 31 into which the adjustment lens barrel 20 is fitted is formed on the end surface on the object side.

The adjustment lens L1 moves the adjustment lens frame 20 relative to the fixed lens frame 30 to make its optical axis coincide with the optical axis α of the fixed lens group L2 as much as possible, and the focus position is adjusted. Adjusted.

In this position adjustment operation, a light source box (not shown) is disposed on the object side of the adjustment lens L1. This light source box has a white light source (light source) (not shown) disposed therein, and a transparent chart 40 made of a transparent material is formed on the surface facing the adjustment lens L1. The transparent chart 40 is a chart in which a total of five identical black and white patterns (contrast detection patterns) are arranged at the center (on the optical axis) in the screen and above, below, left, and right.

On the outer side in the radial direction of the adjustment lens barrel 20, there is a virtual circle X (FIG. 2) that is separated from the adjustment lens barrel 20 (in a non-contact manner), and the center of the virtual circle X is the fixed lens group L2. Located on the optical axis α and on a plane orthogonal to the optical axis α. On this virtual circle X, three electromagnets (position setting magnetic field generating means) 50 are symmetrically arranged with an equiangular (120 °) interval around the optical axis α. The position of the center of the virtual circle X in the optical axis direction is within the range in which the adjustment lens barrel 20 is disposed. Specifically, the center of the virtual circle X is between both end surfaces in the optical axis direction of the adjustment lens barrel 20 arranged on the object side of the fixed lens barrel 30 and is divided by these two planes. It is located at the midpoint O of the line segment. The electromagnet 50 may not be arranged on the virtual circle X as long as it is around the adjustment lens barrel 20, and the arrangement interval may not be equiangular.

Magnetic flux vectors from the electromagnets 50 arranged symmetrically at 120 ° intervals around the optical axis α intersect each other in the vicinity of the middle point O. The electromagnet 50 includes a cylindrical iron core (not shown) and a coil wire (not shown) wound around the iron core, which are arranged in the radial direction of the virtual circle X. The coil wire is led to a current control means 52 (FIG. 3) for controlling the amount of current, and an alternating current is applied. The current control means 52 is connected to the CPU 13.

When a magnetic field is generated from the electromagnet 50 with respect to the adjustment lens barrel, an attractive magnetic force is generated in the adjustment lens barrel 20 in the direction in which the adjustment lens barrel 20 is attracted to the electromagnet 50. This attractive magnetic force acts in a direction perpendicular to the optical axis of the fixed lens unit L2 and intersecting each other. The attractive magnetic force changes according to the strength of the magnetic field of the electromagnet 50, and the strength of the magnetic field changes according to the amount of current that flows through the electromagnet 50. Therefore, the strength of the attractive magnetic force can be changed by adjusting the amount of current. Further, if the crossing angle between the axis of the iron core (optical axis orthogonal magnetic flux) and the optical axis α of the fixed lens group L2 is defined, the attractive direction of the attractive magnetic force of the adjusting lens barrel 20 can be set. The relative position of the adjustment lens barrel 20 with respect to the fixed lens barrel 30 can be adjusted by adjusting the current of the electromagnet 50 and generating a repulsive magnetic force in the adjustment lens barrel 20.

Each electromagnet 50 is held by a depth direction stage 51 erected on a digital camera fixing base and movable in a direction (depth direction) parallel to the optical axis α. The depth direction stage 51 is provided with a motor 53 (FIG. 3) that moves the depth direction stage 51 in the optical axis direction (depth direction). The motor 53 is connected to drive control means 54 that controls the amount of rotation and the movement direction, and the drive control means 54 is connected to the CPU 13. Further, the CPU 13 is connected with an input means 55 for an operator to perform an input operation. Therefore, when the operator performs an input operation on the input unit 55, an instruction to move the depth direction stage 51 is given to the drive control unit 54 via the CPU 13. Thereafter, the motor 53 rotates, and the depth direction stage 51 freely moves in the depth direction (A direction in FIG. 1).

The CPU 13 calculates the contrast value of the image of the transparent chart 40 imaged on the CCD 12 and displays it on the display 14. The contrast value of the image is calculated by multiplying the contrast value of each of the five charts in the screen by the weight value, and the maximum value is displayed.

Next, the position adjustment operation of the adjustment lens L1 will be described. First, the adjustment lens L1 is fixed to the adjustment lens barrel 20 made of a magnetic material. Fixing can be performed by a known method. The adjustment lens barrel 20 is supported on the fixed lens barrel 30 holding the fixed lens group L2 so as to be movable in the direction orthogonal to the optical axis α and in the optical axis direction. That is, the bottom surface of the fitting groove 31 of the fixed lens barrel 30 is orthogonal to the optical axis α. At this time, the optical axis of the adjustment lens L1 and the optical axis α of the fixed lens group L2 roughly match. In this state, when the three electromagnets 50 are energized, the adjustment lens barrel 20 is held at a position where the attractive magnetic forces of the electromagnets 50 are balanced.

Since the attractive magnetic force works only in the direction perpendicular to the optical axis α, the adjusting lens barrel 20 does not move in the optical axis direction. When the depth direction stage 51 is moved in the optical axis direction, the adjustment lens barrel 20 moves in the optical axis direction together with the depth direction stage 51 while being held by the attractive magnetic force. Therefore, the position of the adjustment lens barrel 20 in the optical axis direction can be adjusted.

Thereafter, the white light source is caused to emit light, and the light passing through each chart of the transparent chart 40 is imaged on the CCD 12 through the adjustment lens L1 and the fixed lens group L2.
The image of the transparent chart 40 formed on the CCD 12 and the contrast value are displayed on the display 14.

The operator determines whether or not the optical axis of the adjustment lens L1 and the optical axis α of the fixed lens group L2 are coincident and in focus from the image of the transparent chart 40 and the contrast value.

If the optical axes do not match, the position of the adjustment lens frame 20 is made relative to the fixed lens frame 30 by using an attractive magnetic force acting between the adjustment lens frame 20 and the electromagnet 50. The optical axis of the adjustment lens L1 is made to coincide with the optical axis of the fixed lens group L2 as much as possible (the adjustment lens L1 is aligned with the fixed lens group L2).

Specifically, the operator inputs the movement position of the adjustment lens barrel 20 on a plane orthogonal to the optical axis α to the input unit 55. When the CPU 13 receives the movement position signal from the input unit 55, the CPU 13 sets the current amount of each electromagnet 50 and transmits an energization signal to the current control unit 52. The current control means 52 supplies the set current amount to each electromagnet 50 and controls it. When the amount of current is changed in this way, the magnetic field applied to the adjustment lens barrel 20 changes, and the adjustment lens barrel 20 moves to a position where the attractive magnetic force of each electromagnet 50 is balanced.

In addition, when adjustment in the optical axis direction is necessary (when focus is not achieved), a desired movement position is input to the input means 55. When the CPU 13 receives the movement position signal from the input unit 55, the CPU 13 sets the movement amount of the depth direction stage 51 and transmits a drive signal to the drive control unit 54. The drive control unit 54 drives the motor 53 and moves the depth direction stage 51 in the optical axis direction to focus. At this time, the adjusting lens barrel 20 moves in the optical axis direction together with the depth direction stage 51 (electromagnet 50). Therefore, when the depth direction stage 51 is stopped, the adjustment lens barrel 20 is disposed at a desired position.

As shown in FIG. 2, the adjustment lens barrel 20 is magnetized in the circumferential direction, and the magnetized position and the position of the electromagnet 50 have a phase difference. That is, the adjustment lens barrel 20 has a magnetic pole (S pole or N pole) in the circumferential direction, and the magnetic pole (S pole or N pole) is located at a position facing one electromagnet 50 among the three electromagnets 50. There is. The electromagnets 50 located on the left and right sides of the electromagnet 50 are arranged so that the middle of the S pole and the N pole is opposed to each other at the opposed positions. With this arrangement, the adjustment lens barrel 20 can be easily rotated around the optical axis when the current of each electromagnet 50 is changed. Furthermore, each electromagnet 50 can be tilted with respect to the optical axis α by changing the amount of movement of the depth direction stage 51 in the optical axis direction.

The position of the adjustment lens barrel 20 can be freely adjusted by performing the position adjustment operations in the optical axis direction, the optical axis orthogonal direction, and the rotation direction alone or in combination. The position adjustment operation is completed when the contrast values of the five points on the transparent chart 40 are the same and the axes are matched, and the contrast value is the maximum value and is in focus.

When the adjustment of the position of the adjustment lens barrel 20 is completed, an adhesive made of, for example, an ultraviolet curing agent is injected into the fitting groove 31 while maintaining the relative position of the adjustment lens barrel 20 and the fixed lens barrel 30, and ultraviolet rays are injected. The adjustment lens barrel 20 and the fixed lens barrel 30 are bonded and fixed. When the adjustment lens barrel 20 and the fixed lens barrel 30 are bonded, the electromagnet 50 is deenergized and the digital camera 10 is removed from the digital camera fixing base.

4 and 5 show a second embodiment of the lens position adjusting device of the present invention. The same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

In the second embodiment, instead of the depth direction stage 51 and the electromagnet 50 supported by the depth direction stage 51, a predetermined angle is set with respect to a plane passing through the middle point O and orthogonal to the optical axis α of the fixed lens group L2. Three electromagnets 50 are provided. These electromagnets 50 are arranged at an equal angle (120 °) on the virtual circle X as viewed from the optical axis α direction so that the iron core axes of the electromagnets 50 intersect at the midpoint O. . That is, a magnetic flux line (iron core parallel magnetic flux) that goes straight from each electromagnet 50 and is parallel to the axis of the iron core is directed from the virtual circle X toward the object side, and the iron core parallel magnetic flux of each electromagnet 50 is from the virtual circle X. They cross each other in the vicinity of the optical axis α on the object side (midpoint O). Thus, the iron core parallel magnetic fluxes of the electromagnets 50 cross each other in the vicinity of the midpoint O, and have a predetermined angle with respect to the plane including the midpoint O perpendicular to the optical axis α of the fixed lens unit L2. Yes. In other words, the attraction magnetic force of each electromagnet 50 is within a range in which the adjustment lens barrel 20 is disposed from the object side toward the virtual circle X, and is predetermined to intersect each other on the optical axis α of the fixed lens unit L2. Acts with an angle of

When an attractive magnetic force is applied to the adjustment lens barrel 20 by the electromagnet 50, the adjustment lens barrel 20 is urged in a direction approaching (pressing) the fixed lens barrel 30.

6 and 7 show a third embodiment of the lens position adjusting device of the present invention. The same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

In the present embodiment, instead of the depth direction stage 51 and the electromagnet 50 supported by the depth direction stage 51, the object side and the image side with respect to a plane passing through the middle point O and orthogonal to the optical axis α of the fixed lens group L2. Three pairs of electromagnets 50 are arranged at a predetermined angle. The centers of the virtual circles X on which the object-side and image-side electromagnets 50 are to be disposed are on the optical axis α and are located on the object side and the image side with respect to the middle point O. The object-side and image-side electromagnets 50 are arranged on each virtual circle X at equiangular (120 °) intervals so that the axes of the iron cores intersect at the midpoint O. The object-side electromagnet 50 and the image-side electromagnet 50 are arranged in the same phase, and the object-side electromagnet 50 and the image-side electromagnet 50 form a pair.

A magnetic flux line (image-side iron core parallel magnetic flux) straight from each electromagnet 50 on the image side and parallel to the axis of the iron core is directed from the virtual circle X (electromagnet 50) on the image side toward the object side. The image side iron core parallel magnetic fluxes intersect each other in the vicinity of the middle point O. Further, magnetic flux lines (object-side iron core parallel magnetic flux) that go straight from each electromagnet 50 on the object side and are parallel to the axis of the iron core are directed from the virtual circle X (electromagnet 50) on the object side toward the image side. The object side iron core parallel magnetic fluxes cross each other in the vicinity of the middle point O. Thus, the image side iron core parallel magnetic flux and the object side iron core parallel magnetic flux intersect each other in the vicinity of the middle point O, respectively, and the middle point O is orthogonal to the optical axis α of the fixed lens unit L2. It has a predetermined angle with respect to the plane that contains it.

In other words, the attractive magnetic force of each electromagnet 50 on the image side is from the object side to the virtual circle X on the image side, and is within the range where the adjustment lens barrel 20 is disposed, and the optical axis α of the fixed lens unit L2. Acts with a predetermined angle intersecting each other above. Further, the attractive magnetic force of each electromagnet 50 on the object side is directed from the image side to the virtual circle X on the object side, and within the range where the adjustment lens barrel 20 is disposed, on the optical axis α of the fixed lens unit L2. It acts with a predetermined angle intersecting each other.

The adjustment lens barrel 20 can adjust the amount of movement in the optical axis direction and the direction orthogonal to the optical axis by adjusting the attractive magnetic force of the pair of electromagnets 50. For example, among the electromagnets 50 on the object side and the image side, when the attractive magnetic force of the electromagnet 50 on the object side is increased (strong) and the attractive magnetic force of the electromagnet 50 on the image side is decreased (weak), the adjustment lens barrel 20 The balance of the attractive magnetic force acting between each of the electromagnets 50 changes, and the adjustment lens barrel 20 moves to the object side (optical axis direction). Further, the adjustment lens frame 20 can be tilted by adjusting the balance of the magnetic attractive force between each pair of electromagnets 50.

8 and 9 show a fourth embodiment of the lens position adjusting apparatus of the present invention. The same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

In the present embodiment, instead of the depth direction stage 51 and the electromagnet 50 supported by the depth direction stage 51, a predetermined angle is provided with respect to a plane passing through the middle point O and orthogonal to the optical axis α of the fixed lens group L2. Four electromagnets 50 are arranged. The center of the virtual circle X where the electromagnet 50 is to be placed is on the optical axis α and is located on the image side with respect to the midpoint O. The electromagnets 50 are arranged on the virtual circle X at equiangular (90 °) intervals so that the axes of the iron cores intersect at the midpoint O. A magnetic flux line (iron core parallel magnetic flux) that goes straight from each electromagnet 50 and is parallel to the axis of the iron core is directed from the virtual circle X toward the object side, and each iron axis parallel magnetic flux intersects near the middle point O. is doing.

FIG. 9 shows a state in which a direct current is passed through each electromagnet 50. When a direct current is applied, the magnetic pole of the electromagnet 50 does not change, and the adjustment lens barrel 20 is disposed at a position where each electromagnet 50 is always in balance with the magnetic pole (S pole or N pole) of the adjustment lens barrel 20. Therefore, the adjustment lens barrel 20 does not receive an attractive magnetic force in the rotation direction about the axis, and unnecessary rotation movement of the adjustment lens barrel 20 during the position adjustment operation can be prevented.

In the above embodiment, the adjustment lens L1 (adjustment lens barrel 20) to be position-adjusted is one, but the position of a plurality of lenses can be sequentially adjusted. The adjustment lens barrel 20 can be made of various materials as long as it is a magnetic material, and may be used without being magnetized. Each electromagnet 50 can be freely arranged as long as the adjustment lens barrel 20 can be moved to a desired position.

It is a partial longitudinal cross-sectional view which shows the structure of the lens position adjustment apparatus which concerns on 1st embodiment of this invention. FIG. 2 is a top view of FIG. 1. It is a systematic block diagram of the lens position adjustment device according to the first embodiment of the present invention. It is a partial longitudinal cross-sectional view which shows the structure of the lens position adjustment apparatus which concerns on 2nd embodiment of this invention. FIG. 5 is a top view of FIG. 4. It is a partial longitudinal cross-sectional view which shows the structure of the lens position adjustment apparatus which concerns on 3rd embodiment of this invention. FIG. 7 is a top view of FIG. 6. It is a partial longitudinal cross-sectional view which shows the structure of the lens position adjustment apparatus which concerns on 4th embodiment of this invention. FIG. 9 is a top view of FIG. 8.

Explanation of symbols

10 Digital Camera 11 Digital Camera Body 12 CCD (Image Sensor)
13 CPU
14 Display (display means)
20 Adjusting lens barrel 30 Fixed lens barrel 31 Fitting groove 40 Transparent chart 50 Electromagnet (position setting magnetic field generating means)
51 depth direction stage 52 current control means 53 motor 54 drive control means 55 input means L1 adjustment lens L2 fixed lens group L2a L2b fixed lens

Claims (17)

Fixing the adjustment lens whose relative position is adjusted relative to the fixed lens to an adjustment lens barrel made of a magnetic material;
A movable support step for movably supporting the adjustment lens barrel on the fixed lens barrel holding the fixed lens;
A position adjusting step of moving the adjusting lens frame relative to the fixed lens frame using a magnetic force acting between the adjusting lens frame and the position setting magnetic field generating means;
Fixing the adjusted adjustment lens barrel and the fixed lens barrel;
A lens position adjusting method comprising: 2. The lens position adjusting method according to claim 1, wherein in the movable support step, the adjusting lens optical axis is matched with the fixed lens optical axis as much as possible. 3. The lens position adjustment method according to claim 1, wherein in the movable support step, the adjustment lens frame is movably supported in the optical axis direction with respect to the fixed lens frame, and in the position adjustment step, the adjustment lens frame is supported. Position adjusting method in which the position of the adjusting lens frame in the optical axis direction is also adjusted by the magnetic force acting between the magnetic field generating means and the position setting magnetic field generating means. 4. The lens position adjusting method according to claim 1, wherein the position setting magnetic field generating means is disposed outside the adjusting lens frame in a contactless manner with a circumferential interval. 5. Lens position adjustment method which is an electromagnet for use. 5. The lens position adjusting method according to claim 1, wherein the adjusting lens frame is magnetized in a circumferential direction. 6. 6. The lens position adjustment method according to claim 1, wherein the fixed lens frame is also made of a magnetic material, and the fixed lens frame and the adjustment lens frame are magnetized so as to be attracted to each other. Lens position adjustment method.
A lens position adjusting device for executing the lens position adjusting method according to claim 1,
A fixed lens barrel that holds the fixed lens;
A cylindrical adjustment lens barrel made of a magnetic material that holds an adjustment lens whose position is adjusted with respect to the fixed lens;
Position setting magnetic field generating means for moving the adjustment lens frame relative to the fixed lens frame using a magnetic force acting on the adjustment lens frame;
A lens position adjusting device comprising: 8. The lens position adjusting device according to claim 7, wherein the adjusting lens frame is relatively moved with respect to the fixed lens frame at least in a direction perpendicular to the optical axis. 9. The lens position adjusting device according to claim 7, wherein the adjusting lens frame is also adjusted in position in the optical axis direction. 10. The lens position adjusting device according to claim 7, wherein the adjusting lens frame is magnetized in a circumferential direction. 11. A lens position adjusting device for adjusting a relative position of an adjustment lens to a fixed lens,
A fixed lens barrel that holds the fixed lens;
An adjustment lens barrel made of a magnetic material that holds an adjustment lens whose position is adjusted with respect to the fixed lens;
A plurality of position setting magnetic field generating means arranged around the adjustment lens barrel and generating a magnetic force on the adjustment lens barrel;
Have
A lens position adjusting apparatus, wherein the position of the adjusting lens frame is adjusted relative to the fixed lens frame by the magnetic force of the position setting magnetic field generating means. 12. The lens position adjusting apparatus according to claim 11, wherein the position setting magnetic field generating means includes at least three equiangular intervals on a virtual circle obtained by rotating around the optical axis of the fixed lens of the fixed lens frame. The lens position adjusting device is arranged. 13. The lens adjustment device according to claim 12, wherein the position of the center of the virtual circle in the optical axis direction is within a range in which the adjustment lens barrel is disposed, and the magnetic force line that goes straight from the position setting magnetic field generating means is A lens position adjusting device orthogonal to the optical axis of the fixed lens and intersecting each other. 13. The lens position adjusting apparatus according to claim 12, wherein a magnetic line of force going straight from the position setting magnetic field generating means is directed to the object side from the virtual circle and is within a range in which the adjusting lens frame is disposed, and the fixed lens. Lens position adjusting device that crosses each other on the optical axis of the lens. 13. The lens position adjusting apparatus according to claim 12, wherein the virtual circle is located on the object side and the image side with respect to a plane that is within a range in which the adjustment lens barrel is disposed and is orthogonal to the optical axis of the fixed lens. A magnetic field line that is centered and goes straight from the image-side position setting magnetic field generating means is directed from the virtual circle on the image side toward the object side, and within the range in which the adjustment lens frame is disposed, and the fixed lens. Magnetic field lines that cross each other on the optical axis and go straight from the magnetism of the object-side position setting magnetic field generation unit are directed from the virtual circle on the object side to the image side, and within the range where the adjustment lens frame is disposed. A lens position adjusting device that intersects with each other on the optical axis of the fixed lens. The lens position adjusting device according to any one of claims 11 to 15, wherein the position setting magnetic field generating means is an electromagnet, and an alternating current is passed through the electromagnet. The lens position adjusting device according to any one of claims 11 to 15, wherein the position setting magnetic field generating means is an electromagnet, and a direct current is passed through the electromagnet.

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