JP2007121701A - Optical device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical device capable of effectively reducing power consumption, and speedily and highly accurately moving optical elements to optimum positions in the direction of an optical axis. <P>SOLUTION: The optical elements 3, 4, and 5 are speedily moved in the direction of the optical axis 7 by the magnetic force of an electromagnet 20. The optical elements 3, 4, and 5 are stably held in their positions after moved in the direction of the optical axis 7 by the magnetic force of a permanent magnet. The positions of the optical elements 3, 4, and 5 in the direction of the optical axis are correctly adjusted to optimum positions by adjusting means 40 and 41. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical device, and more particularly to an optical device that is used in an autofocus mechanism, an optical zoom mechanism, and the like in a camera such as a mobile phone and is suitable for moving an optical element such as a lens in the optical axis direction.

  Conventionally, small optical devices such as mobile phone cameras have an autofocus mechanism that moves a lens as an optical element in the optical axis direction to adjust the focal point to an optimal position, and the lens along the optical axis direction. An optical zoom mechanism for adjusting the focal length (in other words, the angle of view) by moving to the telephoto side or the wide angle side has been mounted.

  In an optical apparatus including such an autofocus mechanism and an optical zoom mechanism, a lens module including a single lens or a lens and a barrel holding the lens is moved in the optical axis direction by some actuator.

  As an actuator, for example, an electric force is applied to the voice coil according to Fleming's left-hand rule by passing a current through a boil coil arranged in a magnetic field, and this voice force causes the voice coil to move straight ahead. A voice coil motor was known.

JP-A-2005-114776

  However, in an actuator using a voice coil motor, it is necessary to continue to pass current through the voice coil to maintain the focus position and / or optical zoom position after the lens is moved in the optical axis direction. was there.

  Thus, conventionally, there has been a problem that power consumption becomes excessive particularly in a small optical device premised on battery driving.

  Further, even when the lens is moved to the focus position and / or the optical zoom position, due to the temperature dependency of the refractive index of the optical material (for example, resin material or glass), the ambient temperature, humidity, atmospheric pressure, etc. Depending on this, the optimum focus position and optical zoom position may change.

  As a result, there has conventionally been a problem that the optical element cannot be quickly and accurately moved to an optimal position in the optical axis direction.

  Therefore, the present invention has been made in view of such problems, and can effectively reduce the power consumption, and move the optical element to the optimum position in the optical axis direction quickly and with high accuracy. An object of the present invention is to provide an optical device that can be used.

  In order to achieve the above-mentioned object, the optical device according to claim 1 of the present invention is an optical device including an optical element that is movable in the optical axis direction and a moving mechanism that moves the optical element. The moving mechanism includes an electromagnet that generates a magnetic force by energization and a permanent magnet that acts on the electromagnet, and the optical axis of the optical element is applied by the magnetic force that acts on the permanent magnet. An annular member that is capable of rotating around the center, and that is attracted or attracted to the electromagnet by the magnetic force of the permanent magnet so that the stationary position can be maintained, and the motion of the annular member is the optical element. Conversion means for converting the movement of the optical element into the optical axis direction, and fine adjustment means for finely adjusting the position of the optical element in the optical axis direction.

  According to the first aspect of the present invention, the annular member is caused to rotate around the optical axis of the optical element by the magnetic force generated in the electromagnet, and the movement of the annular member is converted by the conversion means. By converting the movement of the optical element into the optical axis direction, the optical element can be quickly moved in the optical axis direction. And after moving an optical element to the predetermined position in an optical axis direction, it becomes possible to hold | maintain an optical element stably in the position after a movement with the magnetic force which the permanent magnet of an annular member has. Furthermore, if necessary, the position of the optical element in the optical axis direction can be finely adjusted by the fine adjustment means to accurately adjust the position of the optical element in the optical axis direction.

  As a result, the power consumption can be effectively reduced, and the optical element can be quickly and accurately moved to the optimum position in the optical axis direction.

  According to a second aspect of the present invention, there is provided an optical device according to the first aspect, wherein the conversion means is in contact with a driving cam contact portion disposed in the annular member and extending in the optical axis direction, and the driving cam contact portion. The annular member is concentric with the annular member which is movable in the optical axis direction as the annular member performs the movement while contacting the driving cam contact portion with the driven cam surface. An annular first cam member and a position in contact with the first cam member in the optical axis direction are arranged so as to be movable in the optical axis direction as the first cam member moves in the optical axis direction. And an annular second cam member concentric with the first cam member on which the driving cam surface is disposed, and a position in contact with the driving cam surface of the second cam member, coupled to the optical element. The second cam portion is disposed as It is with the optical element in accordance with the movement to the optical axis direction in that a driven cam contact portion which is movable in the direction of the optical axis.

  According to the second aspect of the present invention, the conversion means can be further simplified. As a result, the optical device can be reduced in size and weight and the manufacturing cost can be reduced.

  Furthermore, the optical device according to claim 3 is characterized in that, in claim 1 or 2, the fine adjustment means transmits a driving force to the second cam member to move the second cam member in one direction or the other direction. A gear structure that causes the driven cam contact portion in contact with the driving cam surface to move slightly in the optical axis direction together with the optical element by rotating, and a drive source that supplies the driving force to the gear structure. In the point.

  According to the third aspect of the invention, the fine adjustment means can be further simplified. As a result, an optical device that is smaller and lighter can be manufactured at a lower cost.

  According to the optical device of the present invention, it is possible to effectively reduce the power consumption and to move the optical element to the optimum position in the optical axis direction quickly and with high accuracy. In addition, it is possible to provide an optical device that can be reduced in size and weight and reduced in manufacturing cost.

  Hereinafter, embodiments of an optical device according to the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 and 2, the optical device 1 according to this embodiment includes, as an optical element, the first lens 3 and the first lens 3 in order from the object side to the sensor surface side (image surface side) of the solid-state imaging device 2. 3 lenses 3, 4, and 5, and the lenses 3, 4, and 5 are placed in a cylindrical barrel 8 so that the optical axes 7 coincide with each other. Is retained.

  A diaphragm 9 is provided between the first lens 3 and the second lens 4, a spacer 10 is provided between the second lens 4 and the third lens 5, and a stopper 11 is provided on the image plane side of the third lens 5. Are arranged respectively.

  Furthermore, a substantially rectangular planar case 12 is disposed outside the barrel 8 and the solid-state imaging device 2 so as to surround the barrel 8 and the solid-state imaging device 2.

  The case 12 includes a lower cover 14 in which an opening 13 is formed at a position corresponding to the solid-state image pickup device 2, an upper cover 15 disposed on the upper portion of the lower cover 14, and an upper portion of the upper cover 15. The plate spring 16 is provided.

  An extending portion 19 that extends toward the barrel 8 is formed at the inner end (opening 13 side) end portion of the bottom wall portion 14 a of the lower cover 14.

  The extending portion 19 includes an outer cylindrical portion 19a extending upward in the direction of the optical axis 7 from the inner end portion of the bottom wall portion 14a, and a radial direction orthogonal to the optical axis 7 direction from the outer cylindrical portion 19a. The step portion 19b extends horizontally inward, and the inner cylindrical portion 19c extends upward in the direction of the optical axis 7 from the inner end portion of the step portion 19b. The outer peripheral surface of the barrel 8 is opposed to the inner peripheral surface of the inner cylindrical portion 19c.

  In the present embodiment, a moving mechanism for performing focusing and / or optical zooming by moving the lenses 3, 4, 5 together with the barrel 8 in the direction of the optical axis 7 is disposed in the case 12. .

  That is, as shown in FIGS. 1 to 3, an electromagnet 20 that generates a magnetic force by energization is disposed on the bottom wall portion 14 a of the lower cover 14.

  As shown in FIG. 3, the electromagnet 20 includes a long first side portion 21a along the side wall portion 14b of the lower cover 14, and one end portion in the longitudinal direction of the first side portion 21a (the upper end portion in FIG. 3). ) From the other side (lower end) in the longitudinal direction of the first side 21a and the third side extending at a right angle from the other end (lower end) in the longitudinal direction of the first side 21a. A yoke 21 having a substantially U-shape in a plane composed of 21c is provided. The yoke 21 is made of a ferromagnetic material.

  A coil 23 is wound around the first side portion 21a. The coil 23 is energized from an external power source (not shown) to generate a magnetic field that penetrates the coil 23. ing.

  The magnetic field generated in the coil 23 generates a magnetic force in which the tip of the second side 21b and the tip of the third side 21c of the yoke 21 become two main magnetic poles 24a and 24b having different polarities. It is supposed to be. The polarities of the main magnetic poles 24a and 24b can be reversed by switching the direction of the current flowing through the coil 23.

  As shown in FIGS. 1 and 2, an annular member 25 surrounding the inner cylindrical portion 19c is placed on the upper surface of the step portion 19b.

  As shown in FIGS. 3 and 4, the annular member 25 has a total of 4 formed to protrude outward in the radial direction so as to be equidistant (interval of 90 °) in the circumferential direction (around the optical axis 7). There are two salient pole portions 26a, 26b, 26c, and 26d.

  The annular member 25 includes a right half portion 25a in FIG. 4 including two salient pole portions 26a and 26b adjacent in the circumferential direction and a left half portion 25b in FIG. 4 including the remaining two salient pole portions 26c and 26d. Are formed into two-pole magnetized permanent magnets magnetized with different polarities.

  As shown in FIG. 3, the yoke 21 is positioned outside the annular member 25 in the radial direction. More specifically, one main magnetic pole 24a in the yoke 21 is positioned between the two salient pole portions 26a and 26d magnetized with different polarities adjacent to each other in the circumferential direction. The other main magnetic pole 24b of the yoke is positioned between the other two salient pole portions 26b and 26c magnetized with different polarities.

  Therefore, when a magnetic force is generated in the main magnetic poles 24a and 24b of the yoke 21, a repulsive force acts from the main magnetic poles 24a and 24b on the salient pole portions 26a, 26b, 26c and 26d having the same polarity as the main magnetic poles 24a and 24b. The attraction force acts from the main magnetic poles 24a and 24b on the salient pole portions 26a, 26b, 26c and 26d having a different polarity from the main magnetic poles 24a and 24b.

  In this way, the annular member 25 performs a rotational movement at a predetermined angle around the optical axis 7 by the magnetic force acting by the electromagnet 20.

  As described above, the direction of the rotational movement of the annular member 25 can be reversed from one direction to the other by reversing the polarities of the main magnetic poles 24a and 24b.

  Further, from the viewpoint of smoothly performing the rotational movement (rotation) in one direction or the other direction of the annular member 25, the upper surface of the step portion 19b is preferably formed by a sliding grade.

  By the way, as described above, the yoke 21 is formed of a ferromagnetic material, and the annular member 25 is formed of a permanent magnet. However, between the yoke 21 and the annular member 25, other than the magnetic force of the electromagnet 20 is used. In addition, the magnetic force (attraction force) of the permanent magnet that forms the annular member 25 acts.

  Therefore, even when the energization of the coil 23 is stopped after the rotational motion of the annular member 25 and the magnetic force of the electromagnet 20 is lost, the annular member 21 is caused to generate the yoke 21 (particularly the main member) by its own magnetic force. It will continue to be attracted to the outside in the radial direction on the magnetic poles 24a, 24b) side. At this time, when the annular member 25 is rotationally moved to a position where the salient pole portions 26a, 26b, 26c, and 26d are attracted to the main magnetic poles 24a and 24b, the magnetic force of the electromagnet 20 is lost. The salient pole portions 26a, 26b, 26c, and 26d are continuously attracted to the main magnetic poles 24a and 24b.

  Thereby, the annular member 25 can hold | maintain the stationary position after rotational motion only by the magnetic force of the permanent magnet which self has without requiring the electricity supply to the coil 23 of the electromagnet 20 to be. .

  The salient pole portions 26a, 26b, 26c, and 26d are prevented from being damaged when the salient pole portions 26a, 26b, 26c, and 26d come into contact with the main magnetic poles 24a and 24b due to the rotational movement of the annular member 25, and From the viewpoint of reducing costs, the annular member 25 is desirably formed of a permanent magnet having good impact resistance and low cost, such as a plastic magnet.

  Furthermore, the optical device 1 in the present embodiment includes conversion means for performing a conversion operation for converting the rotational movement of the annular member 25 into the movement movement of the lenses 3, 4, and 5 in the direction of the optical axis 7.

  That is, as shown in FIGS. 4 and 5, three driving cam contact portions 29 extending upward in the direction of the optical axis 7 are equally spaced in the circumferential direction (120 ° intervals) on the upper surface of the annular member 25. Is formed.

  An annular first cam member 30 concentric with the annular member 25 is disposed on the annular member 25.

  As shown in FIGS. 1, 2 and 6, the lower surface of the first cam member 30 is inclined in the direction of the optical axis 7 along the circumferential direction at a position corresponding to the three driving cam contact portions 29. A driven cam surface 31 having a spiral surface 31a and flat surfaces 31b and 31c connected to both ends in the circumferential direction of the spiral surface 31a is formed.

  Each driven cam contact portion 29 is in contact with these driven cam surfaces 31 from below.

  Moreover, as shown in FIG. 7, the inner cylindrical portion 19c is formed with a recess 33 that is recessed inward in the radial direction. Furthermore, a convex portion 34 having an outer peripheral dimension slightly smaller than the inner peripheral dimension of the concave portion 33 is formed at a position corresponding to the concave portion 33 in the first cam member 30, and this convex portion 34 is free to play in the concave portion 33. It is fitted.

  Accordingly, the first cam member 30 can move in the direction of the optical axis 7 as the annular member 25 performs the rotational movement while the driving cam contact portion 29 is in contact with the driven cam surface 31. Yes.

  At this time, the first cam member 30 is restricted from rotating movement around the optical axis 7 because the convex portion 34 is loosely fitted in the concave portion 33, and only moves in the direction of the optical axis 7. Will be allowed.

  Further, as shown in FIGS. 1 and 2, an annular second cam member 36 concentric with the first cam member 30 is placed on the upper surface of the first cam member 30 via the lower surface, The second cam member 36 surrounds the barrel 8.

  As shown in FIGS. 6 and 8, a spiral driving cam surface 37 that is inclined in the direction of the optical axis 7 along the circumferential direction is formed on the upper surface of the second cam member 36. For example, a plurality of the driving cam surfaces 37 may be formed at equal intervals in the circumferential direction.

  As described above, since the second cam member 36 is placed on the upper surface of the first cam member 30 and the first cam member 30 is in contact with the lower side, the first cam member 30 is directed in the direction of the optical axis 7. Along with the movement, the second cam member 30 can also move in the same direction.

  Furthermore, a driven cam contact portion 39 extends toward the driving cam surface 37 at a position facing the driving cam surface 37 on the lower surface of the upper end edge portion 8 a of the barrel 8. The portion is in contact with the driving cam surface 37.

  Accordingly, as the second cam member 36 moves in the direction of the optical axis 7 with the driven cam contact portion 39 in contact with the driven cam surface 37, the driven cam contact portion 39 moves in the direction of the optical axis 7. Can be done.

  The driven cam contact portion 39 is physically connected to the lenses 3, 4, and 5 via the barrel 8, so that the lens 3, as the driven cam contact portion 39 moves in the direction of the optical axis 7. 4 and 5 can move in the direction of the optical axis 7 together with the barrel 8.

  Further, the above-described leaf spring 16 is fixed to the upper surface of the upper end edge portion 8a of the barrel. As a result, the rotational movement of the barrel 8 and the lenses 3, 4, 5 around the optical axis 7 is restricted, so that the lenses 3, 4, 5 can be stably moved in the direction of the optical axis 7. It has become.

  Therefore, in the present embodiment, the annular member 25 is caused to rotate by the magnetic force generated in the electromagnet 20, and the rotational movement of the annular member 25 is converted by the converting operation of the conversion means to the optical axes 7 of the lenses 3, 4, 5. By converting it into a moving motion in the direction, the lenses 3, 4, 5 can be quickly moved in the direction of the optical axis 7. The positions of the lenses 3, 4, and 5 shown in FIG. 1 are on the telephoto side, and the positions of the lenses 3, 4, and 5 shown in FIG. 2 are on the wide-angle side.

  Then, after moving the lenses 3, 4, 5 to a predetermined position in the direction of the optical axis 7, the annular member 25 holds the stationary position after the rotational movement only by the magnetic force of the permanent magnet, so that the lens 3, It becomes possible to hold | maintain 4 and 5 stably in the position after a movement.

  Further, the conversion means can be easily formed by the above-described components 29, 30, 31, 36, 37, and 39.

  In addition to the above configuration, the optical device 1 according to the present embodiment further includes the lenses 3, 4, 5 after the lenses 3, 4, 5 are moved to predetermined positions in the direction of the optical axis 7 by the conversion operation of the conversion unit. Fine adjustment means is provided that can finely adjust the position in the direction of the optical axis 7.

  That is, as shown in FIGS. 1 to 3, a helical gear 40 as a gear structure is formed on the outer peripheral surface of the second cam member 36.

  Further, as shown in FIG. 3, a motor 41 as a drive source is disposed in the vicinity of the second cam member 36. A worm gear 43 is fixed to the tip of the shaft 42 of the motor 41, and the worm gear 43 is meshed with the helical gear 40.

  Then, the driving force supplied by the motor 41 is converted into a driving force in the rotational direction around the optical axis 7 by the worm gear 43 and the helical gear 40, and the driving force in the rotational direction is converted into the second driving force. It can be transmitted to the cam member 36. Note that by rotating the motor 41 in the reverse direction, the driving force in the rotational direction transmitted to the second cam member 36 can be reversed.

  As a result, the second cam member 36 can be rotated in one direction or the other direction around the optical axis 7, and the driven cam contact portion 39 that is in contact with the driving cam surface 37 of the second cam member 36 is replaced with the lens 3. 4 and 5 can be slightly moved in the direction of the optical axis 7.

  Therefore, by finely adjusting the positions of the lenses 3, 4, 5 in the direction of the optical axis 7 by the fine adjustment means, it is possible to correct the positions of the lenses 3, 4, 5 in the direction of the optical axis 7 to an optimum position. Become. Furthermore, the conversion means can be easily formed by the above-described components 40, 41, 43.

  Next, the operation of this embodiment will be described.

  In this embodiment, when focusing and / or optical zooming of the lenses 3, 4, and 5 is started, a magnetic force is generated in the main magnetic poles 24 a and 24 b of the yoke 21 by energizing the coil 23 of the electromagnet 20. Let

  Next, the salient pole portions 26a, 26b, 26c, 26d of the annular member 25 are attracted or repelled from the main magnetic poles 24a, 24b by the magnetic force generated in the main magnetic poles 24a, 24b. A rotational movement in one direction or the other direction around the axis 7 is performed.

  Next, due to the rotational movement of the annular member 25, the first cam member 30 that contacts the driven cam contact portion 29 of the annular member 25 moves in the direction of the optical axis 7.

  Next, as the first cam member 30 moves in the direction of the optical axis 7, the second cam member 36 that is in contact with the first cam member 30 from below is in the same direction of the optical axis 7 as the first cam member 30. Moving.

  Next, as the second cam member 36 moves in the direction of the optical axis 7, the driven cam contact portion 39 that is in contact with the driving cam surface 37 of the second cam member 36 is held by the barrel 8 and the barrel 8. The lens 3, 4, 5 moves in the direction of the optical axis 7.

  In this way, by moving the lenses 3, 4, 5 in the direction of the optical axis 7, the focusing of the lenses 3, 4, 5 and / or optical zooming can be performed.

  In the present embodiment, the rotation angle of the annular member 25 required to move the lenses 3, 4, 5 from the telephoto side position (see FIG. 1) to the wide angle side position (FIG. 2) is the driving cam contact. The rotation angle is required for the portion 29 to reach the other flat surface 31c from the one flat surface 31b of the driven cam surface 31. Therefore, by rotating the annular member 25 within the range of the rotation angle, the lenses 3, 4, and 5 can be moved to a desired position between the telephoto side position and the wide angle side position.

  Also, during focusing and / or optical zooming, the second cam member 36 is slightly rotated around the optical axis 7 because the worm gear 43 is engaged with the helical gear 40 of the second cam member 36. However, it moves in the direction of the optical axis 7. However, if the shape and dimensions of the driving cam surface 37 are designed with this expectation, the accuracy of focusing and optical zooming will not be adversely affected.

  Next, even after the lenses 3, 4, and 5 are moved to the focus position and / or the optical zoom position that are initially optimized, the optimum focus position and the focus position are changed due to environmental changes such as changes in ambient temperature, humidity, atmospheric pressure, and the like. When the optical zoom position changes, the motor 41 is driven and the driving force is transmitted to the second cam member 36 via the helical gear 40.

  As a result, the second cam member 36 rotates in one direction or the other direction around the optical axis 7, and the driven cam contact portion 39 contacting the driving cam surface 37 by this rotation causes the barrel 8 and the lens 3 to rotate. 4 and 5 move slightly in the direction of the optical axis 7.

  By this slight movement, the positions of the lenses 3, 4, 5 in the direction of the optical axis 7 can be finely adjusted, and the positions of the lenses 3, 4, 5 in the direction of the optical axis 7 can be adjusted to the optimum focus position and / or optical zoom position. Can be corrected.

  Next, after the focusing of the lenses 3, 4, 5 and / or optical zooming is completed, the energization to the coil 23 and the driving of the motor 41 are stopped.

  Thereafter, the annular member 25 is attracted to the yoke 21 side only by the magnetic force of the permanent magnet forming the annular member 25, so that the annular member 25 maintains the stationary position after the rotational movement.

  Thereby, the lenses 3, 4, and 5 can be stably held at the optimum focus position and / or optical zoom position without energizing the coil 23.

  As described above, according to the present embodiment, the annular member 25 is caused to rotate by the magnetic force of the electromagnet 20, and this rotational movement is caused by the first cam member having the driving cam contact portion 29 and the driven cam surface 31. 30, the second cam member 36 having the driving cam surface 37 and the driven cam contact portion 39 convert the moving movement of the lenses 3, 4, 5 in the direction of the optical axis 7, thereby focusing the lenses 3, 4, 5 and Optical zooming can be performed quickly.

  After the lenses 3, 4, 5 are moved to the focus position and / or the optical zoom position, the lenses 3, 4, 5 are moved to the focus position and / or only by the magnetic force of the permanent magnet forming the annular member 25. Alternatively, the optical zoom position can be stably held.

  Further, if necessary, the position of the lenses 3, 4, 5 in the direction of the optical axis 7 is finely adjusted by the motor 41 and the helical gear 40, so that the lenses 3, 4, 5 It is possible to accurately adjust the optical zoom position.

  As a result, power consumption can be effectively reduced, and the lenses 3, 4, and 5 can be quickly and accurately moved to the optimum focus position and / or optical zoom position.

  In addition, this invention is not limited to embodiment mentioned above, A various change is possible as needed.

  For example, the magnetized pattern of the annular member 25, the shape of the yoke 21, and the like can be variously changed as necessary.

  The first cam member 30 and the second cam member 36 are integrally formed of a material having a low friction coefficient of a resin sliding grade (PTFE or the like) by an injection molding method. The exercise may be performed smoothly.

In the embodiment of the optical device according to the present invention, a longitudinal sectional view showing a movement state of the lens to the telephoto side position In the embodiment of the optical device according to the present invention, a longitudinal sectional view showing the movement state of the lens to the wide-angle side position Plane schematic perspective view showing an embodiment of an optical device according to the present invention The top view which shows an annular member in embodiment of the optical apparatus which concerns on this invention Side view of FIG. FIG. 3 is a development view showing a conversion means in the embodiment of the optical device according to the present invention. AA sectional view of FIG. The side view which shows the 2nd cam member in embodiment of the optical apparatus which concerns on this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical apparatus 3 1st lens 4 2nd lens 5 3rd lens 7 Optical axis 20 Electromagnet 25 Annular member 29 Drive cam contact part 30 1st cam member 31 Drive cam surface 36 2nd cam member 37 Drive cam surface 39 Drive cam contact Part 40 Helical gear 41 Motor

Claims (3)

An optical element capable of moving in the optical axis direction;
An optical device including a moving mechanism for moving the optical element,
The moving mechanism is
An electromagnet that generates magnetic force when energized;
The permanent magnet has a permanent magnet to which a magnetic force generated in the electromagnet acts. The magnetic force acting on the permanent magnet enables a movement that rotates around the optical axis of the optical element. An annular member that is attracted or attracted to the electromagnet by force to be able to hold a stationary position;
Conversion means for converting the movement of the annular member into a movement movement of the optical element in the optical axis direction;
An optical apparatus comprising: fine adjustment means for finely adjusting a position of the optical element in the optical axis direction. The converting means is
A driving cam contact portion disposed in the annular member and extending in the optical axis direction;
It has a driven cam surface that comes into contact with the driving cam contact portion, and the annular member is movable in the optical axis direction along with the movement while contacting the driving cam contact portion with the driven cam surface. An annular first cam member concentric with the annular member;
The first cam member is disposed at a position in contact with the first cam member in the optical axis direction so as to be movable in the optical axis direction in accordance with the movement of the first cam member in the optical axis direction. An annular second cam member concentric with the disposed first cam member;
The second cam member is disposed at a position in contact with the driving cam surface as a state connected to the optical element, and the second cam member is moved together with the optical element along with the movement of the second cam member in the optical axis direction. The optical device according to claim 1, further comprising a driven cam contact portion that is movable in the optical axis direction. The fine adjustment means;
By transmitting a driving force to the second cam member and rotating the second cam member in one direction or the other direction, the driven cam contact portion that is in contact with the driving cam surface is moved together with the optical element in the optical axis direction. A gear structure that slightly moves to
The optical apparatus according to claim 2, further comprising: a driving source that supplies the driving force to the gear structure.

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