JP2010039213A - Lens drive mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens drive mechanism which is simple in construction and can reliably prevent the worm gear and nut constituting the lens drive mechanism from biting each other. <P>SOLUTION: This lens drive mechanism has a second pin (a second revolution regulator) 122 provided on one frame 101 to limit the revolution of a motor shaft 107, and a first pin (a first revolution regulator) 120 provided on the tip of the motor shaft 107 to hit the second pin (the second revolution regulator) 122 when the motor shaft 107 is moved toward the frame 101 by the nut 109 hitting another frame 102. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lens driving device mounted on an optical pickup device used for reproducing or recording an optical disc.

  A lens driving device mounted on an optical pickup device or a digital camera has a worm gear formed on a motor shaft of a motor fitted with a nut that moves together with a lens holder on which the lens is mounted. The holder moves.

  As a problem of the above lens driving device, when the motor control runs away for some reason and the nut goes too far to both ends of the motor shaft, the worm gear and the nut may bite and become inoperable. In order to prevent this biting, it is known that hemispherical protrusions are provided on the nut to reduce the friction coefficient by reducing the contact (contact) area with the mounting plate, making it difficult to enter the mechanical lock state. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 2004-170753

  The above-mentioned conventional technique is also one measure for preventing the worm gear and the nut from getting stuck and becoming inoperable. However, depending on the contact state between the hemispherical protrusion of the nut and the mounting plate, the contact area is small. The contact pressure (surface pressure) increases and the mechanical lock state is established, and there is a possibility that it will be difficult to release. For this reason, a measure for reliably preventing inoperability due to the bite between the worm gear and the nut is desired.

  An object of the present invention is to provide a lens driving device that has a simple structure and can reliably prevent biting.

  In order to achieve the above object, the first invention includes two opposing frames, a guide shaft provided between the frames, a lens holder provided movably along the guide shaft, and a motor shaft. A motor provided on the other frame such that the tip of the lens extends toward the one frame, a worm gear provided on a motor shaft of the motor, and the other of the lens holders so as to be screwed into the worm gear. In a lens driving device having a nut arranged on the frame side and a preload spring provided between the lens holder and the one frame, a second rotation regulation provided on the one frame and regulating the rotation of the motor shaft. A member and the one side of the motor shaft which is provided on the tip side of the motor shaft and is generated when the nut abuts on the other frame The movement of, characterized by comprising a first rotation restricting member abutting on the second rotation restricting member.

  In a second aspect based on the first aspect, a gap between the first rotation restricting member and the second rotation restricting member is set to be less than a movable range in the axial direction of the motor shaft of the motor. It is characterized by that.

  Further, according to a third invention, in the first or second invention, the first rotation restricting member is constituted by a first pin provided perpendicular to an axial direction of the motor shaft, and the second pin The rotation restricting member is composed of a second pin provided in parallel to the axial direction of the motor shaft so as to intersect on the extension of the first pin.

  According to a fourth aspect of the present invention, in the first or second aspect, the first rotation restricting member includes a first protrusion provided perpendicular to the axial direction of the motor shaft. The second rotation restricting member is constituted by a second protrusion provided in parallel to the axial direction of the motor shaft so as to intersect on the extension of the first protrusion.

  Furthermore, a fifth invention according to any one of the first to fourth inventions, with respect to the axial direction of the motor shaft so as to intersect the lens holder on the extension of the first rotation restricting member. A third rotation restricting member is provided in parallel.

  According to a sixth aspect of the present invention, there is provided a lens driving device in an optical pickup device including a laser, a mirror that reflects light emitted from the laser, and an objective lens that collects reflected light from the mirror onto an optical disk. The lens driving device according to any one of claims 1 to 5 is mounted.

  According to the present invention, since the structure is simple and the biting between the worm gear and the nut constituting the lens driving device can be surely prevented, the reliability of the lens driving device can be further improved.

  Hereinafter, embodiments of a lens driving device of the present invention will be described with reference to the drawings.

1 to 7 show a first embodiment of the lens driving device of the present invention. FIG. 1 is a plan view showing the first embodiment of the lens driving device of the present invention. FIG. FIG. 3 is a plan view showing an operation example when the lens holder in the first embodiment of the lens driving device of the present invention shown in FIG. 1 is moved to one side, and FIG. 3 is an enlarged plan view showing a portion A shown in FIG. 4 is a plan view showing an example of rotation restricting operation of the first embodiment of the lens driving device of the present invention shown in FIG. 1, FIG. 5 is an enlarged plan view showing a portion B shown in FIG. 4, and FIG. FIG. 7 is a plan view showing an example of a rotation restricting operation when the lens holder in the first embodiment of the lens driving device of the present invention shown in FIG. 1 is moved to the other side, and FIG. 7 is an enlarged view of a portion C shown in FIG. It is a top view.
In FIG. 1, the lens driving device 100 includes one frame 101 and the other frame 102 that face each other. A guide shaft 103 is provided between one frame 101 and the other frame 102 facing each other. A lens holder 105 fitted with a lens 104 is fitted between the opposing frame 101 and the other frame 102 so as to slide along the guide shaft 103 in the vertical direction in the drawing. Are combined.

  A stepping motor 106 is provided on the opposite surface side of the other frame 102. The motor shaft 107 of the stepping motor 106 passes through the other frame 102 and the lens holder 105, and its tip extends toward the one frame 101. A worm gear 108 is provided on the motor shaft 107 through the lens holder 105.

  A nut 109 that is screwed into the worm gear 108 is disposed on the other frame 102 surface side of the lens holder 105. By providing the nut 109 with means (not shown) for suppressing the rotation of the nut 109 itself, the nut 109 moves up and down along the motor shaft 107 by the rotation of the worm gear 108. Furthermore, one of the guide shafts 103 between the one frame 101 and the lens holder 105 is provided with a preload spring 110 for pushing the lens holder 105 downward.

  The motor shaft 107 of the stepping motor 106 has a slight backlash in the axial direction due to its structure. However, by providing a washer or a spring washer on the bearing of the motor shaft 107 (not shown), the motor shaft A preload is applied to the motor 107 to stabilize the operation of the motor shaft 107 in the axial direction.

  A first pin (first rotation regulating member) 120 is provided on the front end side of the motor shaft 107 perpendicular to the axial direction of the motor shaft 107. On the inner side surface of one frame 101, a second pin (second rotation restricting member) 122 is provided in parallel to the axial direction of the motor shaft 107 so as to intersect the extension of the first pin 120. It has been. On the side surface of one frame 101 of the lens holder 105, with respect to the axial direction of the motor shaft 107 so that the third pin 121 (third rotation restricting member) intersects the extension of the first pin 120. It is provided in parallel. In this example, the third pin 121 is shifted from the second pin 122 so as not to collide with the second pin 122.

  Between the first pin 120 and the second pin 122, it is usually set to be less than the movable range in the axial direction of the motor shaft 107 corresponding to a slight backlash in the axial direction on the support structure of the motor shaft 107. ing. In other words, this gap is a slight backlash in the axial direction of the motor shaft 107 on the support structure due to the downward movement force of the lens holder 105 when the lens holder 105 moves below the allowable value in the drawing. Rises instantaneously upward (on the one frame 101 side) so that the first pin 120 contacts the second pin 122.

Next, the operation of the above-described first embodiment of the lens driving device of the present invention will be described with reference to FIGS.
In FIG. 1, when the lens holder 105 is moved upward in the drawing of FIG. 1, if the motor shaft 107 of the stepping motor 106 is rotated in one direction, the lens holder 105 is engaged by the engagement of the nut 109 and the worm gear 108. Can be moved upward on the drawing of FIG.

  Next, when moving the lens holder 105 downward in the drawing of FIG. 1, if the motor shaft 107 of the stepping motor 106 is rotated in the other direction, the lens holder 105 is moved by the meshing of the nut 109 and the worm gear 108. It can be moved downward on the drawing of FIG. At this time, since the compressed preload spring 110 pushes the lens holder 105 downward, the nut 109 moves the lens holder 105 downward while contacting the tooth surface of the worm gear 108.

Next, the rotation restricting operation of the motor shaft 107 when the lens holder 105 is moved to the one frame 101 side will be described with reference to FIGS.
When the control of the stepping motor 106 goes out of control for some reason and the nut 109 moves vigorously upward in FIG. 2, the lens holder 105 also moves upward in the same manner. For this reason, as shown in FIG. 3, the third pin 121 comes into contact with the first pin 120. Then, an excessive torque is generated in the motor shaft 107, the stepping motor 106 steps out, and the rotation of the motor shaft 107 can be stopped.

  If the first pin 120, the second pin 122, and the third pin 121 are not provided, the lens holder 105 and one frame 101 are in surface contact. Therefore, the area to which the force is applied becomes large, and the nut 109 gradually bites excessively on the worm gear 108 until reaching the torque at which the rotation of the motor shaft 107 stops, making it difficult to return the nut 109 downward. On the other hand, when the first pin 120 and the third pin 121 come into contact with each other, the contact between the first pin 120 and the third pin 121 is local. Therefore, the nut 109 does not bite excessively over the worm gear 108 and the motor shaft 107 rotates. Can be stopped.

  Therefore, when the nut 109 returns downward due to the reverse rotation of the worm gear 108, the nut 109 does not bite into the worm gear 108, and the nut 109 can be easily moved downward by the effect that the compressed preload spring 110 strongly pushes the lens holder 105 down. You can return to In addition, since the stop position of the lens holder 105 becomes accurate and the origin for controlling the position of the lens holder 105 is determined with high accuracy, spherical aberration of the objective lens can be performed with high accuracy in the optical pickup device described later. Further, a sensor for monitoring the position of the lens holder 105 is not necessary, and the cost can be reduced.

Next, the rotation restricting operation of the motor shaft 107 when the lens holder 105 is moved to the other frame 102 will be described with reference to FIGS.
As shown in FIG. 4, when the lens holder 105 is lowered in FIG. 4 and the nut 109 is in contact with the other frame 102, the control of the stepping motor 106 runs away for some reason, and the nut 109 moves to the other frame 102. As shown in FIG. 4 and FIG. 5, a gap is formed between the title pin 120 and the second pin 122 at the moment when it touches vigorously. Immediately thereafter, the upper thrust force toward the one frame 101 acts on the motor shaft 107, and the motor shaft 107 tends to protrude upward. Then, as described above, since the motor shaft 107 has a slight backlash in the axial direction due to its structure, the motor shaft 107 instantaneously moves upward beyond the gap amount between the first pin 120 and the second pin 122. 6 and 7, the first pin 120 hits the second pin 122, the stepping motor 106 steps out, and the rotation of the motor shaft 107 stops.

  As a result, excessive biting between the worm gear 108 and the nut 109 is prevented, and the return movement of the nut 109 upward is facilitated. In addition, since the stop position of the lens holder 105 becomes accurate and the origin for controlling the position of the lens holder 105 is determined with high accuracy, spherical aberration of the objective lens can be performed with high accuracy in the optical pickup device described later. Further, a sensor for monitoring the position of the lens holder 105 is not necessary, and the cost can be reduced.

  In the above-described embodiment, the first pin 120 is attached to the motor shaft 107 in a cantilever structure. However, the first pin 120 is connected to the third pin 121 or the second pin 122. A structure in which the first pin 120 penetrates the motor shaft 107 and the rotation radii of the first pin 120 are inserted almost equally may be used as long as the effect of restricting rotation by contact is obtained.

  According to this example, excessive biting between the worm gear 108 and the nut 109 as in the above-described embodiment is prevented, and the upward return movement of the nut 109 is facilitated. In addition, since the stop position of the lens holder 105 becomes accurate and the origin for controlling the position of the lens holder 105 is determined with high accuracy, spherical aberration of the objective lens can be performed with high accuracy in the optical pickup device described later. Further, a sensor for monitoring the position of the lens holder 105 is not necessary, and the cost can be reduced. In addition, even if one side of the first pin 120 is damaged due to excessive torque, the other side of the first pin 120 remains, so that the rotation of the motor shaft 107 can be restricted and reliability is improved. .

A second embodiment of the lens driving device of the present invention will be described with reference to FIGS. 8 to 12, the same reference numerals as those shown in FIG. 1 are the same or corresponding parts, and thus detailed description thereof is omitted.
In the second embodiment, the function of restricting the rotation of the motor shaft 107 in the first embodiment described above is further improved. In the first embodiment shown in FIG. 1, when the first pin 120, the third pin 121, and the second pin 122 come into contact with each other, a cause such as torque variation that causes the stepping motor 106 to step out. Thus, even if the first pin 120, the third pin 121, and the second pin 122 come into contact with each other, the first pin 120 gets over the third pin 121 and the first pin 122, and 1 of the worm gear 108 is obtained. It is conceivable that the rotation of the motor shaft 107 is stopped by proceeding to an extra of 2 pitches. When trying to return the nut 109 in such a state, even if the motor shaft 107 is rotated once, the first pin 120 does not move away from the third pin 121 and the first pin 122 and cannot be returned. is there.

  In order to improve this point, in the second embodiment, the second pin 122 is configured to move in accordance with the rotation direction of the first pin 130 that penetrates and is fixed to the motor shaft 107. It is. Specifically, as shown in FIG. 9, the second pin 122 has a structure that can move between the inside and the outside of the turning radius 140 of the first pin 130. When it is outside the radius of rotation 140 at the position indicated by reference numeral 122a, it moves so as to be at the position indicated by reference numeral 122b. As shown in FIG. 10, the second pin 122 has one end inserted into a groove 137 formed in one frame 101, and is movably provided on one frame 101 by a pin shaft 135. It moves like a pendulum around 135. The first pin 122 cannot rotate beyond the point where the base end thereof and the inclined surface of the groove 137 of the one frame 101 come into contact with each other, and the position indicated by the reference numeral 122a shown in FIG. Become. That is, even if an external force acts on the second pin 122 and the second pin 122 moves to the position indicated by reference numeral 122b, the second pin 122 returns to the position indicated by reference numeral 122a when the external force is eliminated. It is.

  Similarly to the second pin 122, the third pin 121 is also provided in the lens holder 105 so as to be movable between the inside and the outside of the rotation radius 140 of the first pin 130. Then, as shown in FIG. 12, when the third pin 121 is within the rotation radius 140, the third pin 121 is movable to a position indicated by reference numeral 121a, and when it is outside the rotation radius 140, the third pin 121 is movable to a position indicated by reference numeral 121b. Is possible.

Next, the operation of the above-described second embodiment of the lens driving device of the present invention will be described.
First, the rotation restricting operation of the motor shaft 107 when the lens holder 105 is moved toward the other frame 102 will be described with reference to FIGS. 8 to 10. When the lens holder 105 is moved toward the other frame 102. The first motor pin 130 is counterclockwise in FIG. 9, but as shown in FIG. 8, when the lens holder 105 is lowered in FIG. 8 and the nut 109 is in contact with the other frame 102, A gap is formed between the first pin 130 and the second pin 122 at the moment when the control of the stepping motor 106 runs away for some reason and the nut 109 comes into contact with the other frame 102 vigorously.

  Immediately thereafter, the upper thrust force toward the one frame 101 acts on the motor shaft 107, and the motor shaft 107 tends to protrude upward. Then, as described above, since the motor shaft 107 has some backlash in the axial direction due to its structure, the motor shaft 107 instantaneously moves upward beyond the gap amount between the first pin 130 and the second pin 122. Since it rises, the first pin 130 comes into contact with the second pin 122 within the rotation radius 140 indicated by reference numeral 122a shown in FIG. 9, the stepping motor 106 steps out, and the rotation of the motor shaft 107 stops. .

  In order to restore the above-described rotation restriction of the motor shaft 107, the first pin 130 is clockwise, but when the first pin 130 contacts the second pin 122 within the rotation radius 140, the second pin The pin 122 moves out of the rotation radius 140 as indicated by reference numeral 122b in FIG. 9, and thus can be restored without hindering the rotation of the first pin 130.

  As a result, the nut 109 can be reliably restored. In addition, since the stop position of the lens holder 105 becomes accurate and the origin for controlling the position of the lens holder 105 is determined with high accuracy, spherical aberration of the objective lens can be performed with high accuracy in the optical pickup device described later. Further, a sensor for monitoring the position of the lens holder 105 is not necessary, and the cost can be reduced.

  Next, the rotation restricting operation of the motor shaft 107 when the lens holder 105 is moved to the one frame 101 side will be described with reference to FIGS. 11 and 12. The lens holder 105 is moved to the one frame by the stepping motor 106. When moving to the 101 side, the first pin 130 turns clockwise in FIG. 12, but when the nut 109 moves vigorously upward, the third pin 121 contacts the first pin 130. Then, an excessive torque is generated in the motor shaft 107, the stepping motor 106 steps out, and the rotation of the motor shaft 107 can be stopped.

  In order to return the rotation restriction of the motor shaft 107, the first pin 130 is counterclockwise, but when the first pin 130 and the third pin 121 come into contact with each other, the third pin 121 is As indicated by reference numeral 121b in FIG. 12, since the first pin 130 moves to a position outside the rotation radius 140, the first pin 130 can be restored without hindering the rotation.

  As a result, the nut 109 can be reliably returned from the rotation restriction. In addition, since the stop position of the lens holder 105 becomes accurate and the origin for controlling the position of the lens holder 105 is determined with high accuracy, spherical aberration of the objective lens can be performed with high accuracy in the optical pickup device described later. Further, a sensor for monitoring the position of the lens holder 105 is not necessary, and the cost can be reduced.

  In the embodiment shown in FIGS. 8 to 12, the second and third pins 122 and 121 are movably provided on the frame 101 and the lens holder 105 by the pin shaft 135, and the second is provided by the spring 136. Although the example which returns the pin 122 and the 3rd pin 121 to a fixed position was shown, it is not restricted to this, The 2nd pin 122 and the 3rd pin 121 are along the groove | channel provided in one 101 and the lens holder 105. The same effect can be obtained also in an embodiment in which translational movement is possible and the spring force returns to a fixed position.

A third embodiment of the lens driving device of the present invention will be described with reference to FIGS. In FIG. 13 to FIG. 16, the same reference numerals as those shown in FIG.
In the third embodiment, the rotation restricting member is constituted by a protrusion. Specifically, the two first protrusions 150 and 160 are provided on the front end side of the motor shaft 107. The second projecting portion 152 that is arranged side by side in the axial direction and contacts the first projecting portion 150 when the rotation of the motor shaft 107 is restricted is provided on one frame 101 and when the rotation of the motor shaft 107 is restricted. A third protrusion 151 that contacts the protrusion 160 of the lens holder 105 is provided on the lens holder 105. As shown in FIGS. 14 and 16, the first projecting portion 150, the second projecting portion 152, and the third projecting portion 151 are substantially triangular in cross section perpendicular to the axis of the motor shaft 107 and have a motor shaft. 107 has a contact surface along the axial direction.

Next, a third embodiment of the above-described lens driving device of the present invention will be described with reference to FIGS.
As shown in FIG. 13, by driving the stepping motor 106, the lens holder 105 is moved downward in the drawing, and immediately after the nut 109 comes into contact with the other frame 102 vigorously, the upper thrust force is applied to the motor shaft 107. The motor shaft 107 tries to protrude upward. Then, as described above, since the motor shaft 107 has some backlash in the axial direction due to its structure, the motor shaft 107 rises instantaneously upward. By setting the gap between the first protrusion 150 and the second protrusion 152 to be less than the movable range in the axial direction of the first protrusion 150, the first protrusion 150 and the second protrusion 152 As shown in FIG. 14, the contact is made, the stepping motor 106 steps out, and the rotation of the motor shaft 107 stops.

  As a result, the rotation of the motor shaft 107 is reliably stopped. Therefore, the stop position of the lens holder 105 becomes accurate, and the origin for controlling the position of the lens holder 105 is determined with high accuracy, so that spherical aberration of the objective lens can be performed with high accuracy in the optical pickup device described later. Further, a sensor for monitoring the position of the lens holder 105 is not necessary, and the cost can be reduced. Further, since the structure can be made stronger than the pin shape, the reliability is improved.

  On the other hand, in order to release the rotation restriction of the motor shaft 107 and return, the first protrusion 150 rotates clockwise in FIG. 14, but by the time of the return, the first protrusion 150 and the first protrusion Even when one protrusion 152 contacts, it is necessary to easily get over. Therefore, as shown in FIG. 14, the contact surface of the first protrusion 150 and the second protrusion 152 is formed into an inclined surface so that the first protrusion 150 and the second protrusion 152 can get over each other, and the first protrusion 150 can rotate clockwise. Thus, the nut 109 can be reliably returned.

  Next, when the lens holder 105 is moved upward on the surface of FIG. 15 by driving the stepping motor 106, the first protrusion 160 rotates clockwise in FIG. Then, the third protrusion 151 comes into contact with the first protrusion 160 as shown in FIG.

  As a result, since the rotation of the motor shaft 107 is reliably stopped, the stop position of the lens holder 105 becomes accurate, and the origin for controlling the position of the lens holder 105 is accurately determined. Spherical aberration can be accurately performed. Further, a sensor for monitoring the position of the lens holder 105 is not necessary, and the cost can be reduced. Further, since the structure can be made stronger than the pin shape, the reliability is improved.

  Next, in order to cancel the rotation restriction of the motor shaft 107 described above and return it, the first protrusion 160 rotates counterclockwise in FIG. 16, but at the beginning of the return, Even when the protrusion 160 and the third protrusion 151 come into contact with each other, it is necessary to easily get over. Therefore, as shown in FIG. 16, the contact surfaces of the first protrusion 160 and the third protrusion 151 are inclined so that they can get over each other, and the first protrusion 160 can rotate counterclockwise. Since it is configured, the nut 109 can be reliably returned.

Another example of the rotation restricting member having the shape of the protrusion used in the embodiment of the lens driving device of the present invention will be described with reference to FIG. In FIG. 17, the same reference numerals as those shown in FIG. 1 are the same or corresponding parts, and detailed description thereof will be omitted.
In this embodiment, first protrusions 170 and 180 having a substantially triangular cross-sectional shape in a direction parallel to the axis of the motor shaft 107 are fixed to the tip end side of the motor shaft 107, and these first protrusions 170. The second projecting portion 172 and the third projecting portion 171 in contact with 180 are formed in a substantially triangular shape in cross-section in the direction parallel to the axis of the motor shaft 107, like the first projecting portions 170 and 180. The first frame 101 and the lens holder 105 are fixed to each other.

  Also in this example, the same operation as the above-described embodiment is possible, and the same effect can be obtained.

FIG. 18 shows the configuration of an optical pickup device equipped with the lens driving device of the present invention. In this figure, the same reference numerals as those shown in FIG. 1 denote the same or corresponding parts. Detailed description is omitted.
The optical drive device 200 includes an optical pickup device 300, an optical disc 400, and a motor 500 that rotates the optical disc. The optical pickup device 300 includes a laser 310, a lens driving device 100 for correcting spherical aberration, a mirror 330 that reflects the laser light, and an objective lens 340 that focuses the light onto the optical disc 400.

  When condensing laser beams having different wavelengths onto the optical disc 400 with one objective lens 340, the influence of the spherical aberration of the objective lens 340 is increased, so the lens driving device 100 according to the present invention for correcting the spherical aberration is used. As a result, in the optical pickup device that condenses laser beams having different wavelengths onto the optical disc 00 using the single objective lens 340, a lens driving device that can accurately correct the spherical aberration of the objective lens 340 can be obtained.

It is a top view which shows 1st Embodiment of the lens drive device of this invention. It is a top view which shows the example of rotation control operation | movement at the time of moving the lens holder in 1st Embodiment of the lens drive device of this invention shown in FIG. 1 to one side. It is a top view which expands and shows the A section shown in FIG. It is a top view which shows the operation example at the time of moving the lens holder in 1st Embodiment of the lens drive device of this invention shown in FIG. 1 to the other. It is a top view which expands and shows the B section shown in FIG. It is a top view which shows the example of rotation control operation | movement at the time of moving the lens holder in 1st Embodiment of the lens drive device of this invention shown in FIG. 1 to the other. It is a top view which expands and shows the C section shown in FIG. It is a top view which shows 2nd Embodiment of the lens drive device of this invention. It is a side view of 2nd Embodiment of the lens drive device of this invention shown in FIG. It is the expanded side view which looked at the rotation control member which comprises 2nd Embodiment of the lens drive device of this invention shown in FIG. 8 from the XX arrow view of FIG. It is a top view which shows the operation example at the time of moving the lens holder in 2nd Embodiment of the lens drive device of this invention shown in FIG. 8 to one side. It is the side view which looked at the lens holder in 2nd Embodiment of the lens drive device of this invention shown in FIG. 11 from the XII-XII arrow. It is a top view which shows 3rd Embodiment of the lens drive device of this invention. It is the side view which looked at 3rd Embodiment of the lens drive device of this invention shown in FIG. 13 from the XIV-XIV arrow. It is a top view which shows the operation example at the time of moving the lens holder in 3rd Embodiment of the lens drive device of this invention shown in FIG. 13 to one side. It is the side view which looked at 3rd Embodiment of the lens drive device of this invention shown in FIG. 15 from XVI-XVI arrow. It is a perspective view which shows the other example of the rotation control member which comprises embodiment of the lens drive device of this invention. It is a block diagram of the optical pick-up apparatus carrying the embodiment of the lens drive device of this invention.

Explanation of symbols

100 lens driving device 101 one frame 102 other frame 103 guide shaft 104 lens 105 lens holder 106 stepping motor 107 motor shaft 108 worm gear 109 nut 110 preload spring 120 first pin 121 third pin 122 second pin 130 second 1 pin 135 pin shaft 136 spring 150 first protrusion 151 third protrusion 152 second protrusion 160 first protrusion 170 first protrusion 171 third protrusion 172 second protrusion 180 First protrusion 200 Optical drive device 300 Optical pickup device 310 Laser 330 Mirror 340 Objective lens 400 Optical disk 500 Motor

Claims (6)

Two opposing frames, a guide shaft provided between the frames, a lens holder provided movably along the guide shaft, and a tip of the motor shaft so as to extend to the one frame side A motor provided on the other frame; a worm gear provided on a motor shaft of the motor; a nut disposed on the other frame side of the lens holder so as to be screwed to the worm gear; the lens holder and the one In the lens driving device having a preload spring provided between the frames,
A second rotation restricting member provided on the one frame and restricting the rotation of the motor shaft;
A first abutting against the second rotation restricting member is provided on a tip end side of the motor shaft, and the motor shaft moves toward the one frame when the nut abuts against the other frame. And a rotation regulating member. The lens driving device according to claim 1,
The lens driving device according to claim 1, wherein a gap between the first rotation restricting member and the second rotation restricting member is set to be less than a movable range of the motor shaft in the axial direction. The lens driving device according to claim 1 or 2,
The first rotation restricting member is constituted by a first pin provided perpendicular to the axial direction of the motor shaft, and the second rotation restricting member intersects on the extension of the first pin. As described above, the lens driving device is constituted by a second pin provided in parallel to the axial direction of the motor shaft. The lens driving device according to claim 1 or 2,
The first rotation restricting member is constituted by a first protrusion provided perpendicular to the axial direction of the motor shaft, and the second rotation restricting member is formed on the extension of the first protrusion. A lens driving device comprising a second protrusion provided in parallel to the axial direction of the motor shaft so as to intersect. The lens driving device according to any one of claims 1 to 4,
3. A lens driving device according to claim 1, wherein a third rotation restricting member is provided in parallel to the axial direction of the motor shaft so that the lens holder intersects the extension of the first rotation restricting member.   6. The lens driving device according to claim 1, wherein the lens driving device includes a laser, a mirror that reflects light emitted from the laser, and an objective lens that condenses the reflected light from the mirror onto an optical disk. A lens driving device comprising the above lens driving device.

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