JP2009116988A - Optical pickup device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical pickup device adjusting the position of a first lens in a plane vertical to the optical axis of a laser beam made incident on the first lens, and suppressing the adjustment work from being complicated. <P>SOLUTION: The optical pickup device 100 includes: a collimator lens 5c of a BD optical system 5, a lens holder 16 for holding the collimator lens 5c, a semiconductor laser 1 for emitting a laser beam to the collimator lens 5c, and an adjustment mechanism 20 for adjusting the position of the lens holder 16 in a plane vertical to the optical axis of the laser beam made incident on the collimator lens 5c. The adjustment mechanism 20 includes a leaf spring member 22 for energizing the lens holder 16, and adjustment screws 23a and 23b for adjusting the position of the lens holder 16 against energizing force of the leaf spring member 22. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical pickup device provided with a lens.

  2. Description of the Related Art Conventionally, there has been known an optical pickup device that includes a lens and a light source that emits laser light to the lens, and that can adjust the inclination of the lens with respect to the optical axis of the laser light incident on the lens (for example, Patent Documents 1 to 3) 3).

  The optical pickup devices disclosed in Patent Documents 1 and 2 are provided with a lens holding member for holding a lens, and a spherical convex portion is formed on the lens holding member. Further, the optical pickup device is provided with a spherical concave portion in which the convex portion of the lens holding member is disposed. For this reason, the optical pickup device is configured such that the inclination of the lens can be adjusted by sliding the convex portion of the lens holding member. Therefore, the optical pickup device is configured to be able to adjust the inclination of the lens with respect to the optical axis of the laser light incident on the lens.

  The optical pickup device disclosed in Patent Document 3 has a housing provided with a light source, and a spherical convex portion is formed on the housing. Further, the optical pickup device is provided with a spherical concave portion in which the convex portion of the housing is disposed. For this reason, the optical pickup device is configured such that the inclination of the laser light incident on the lens can be adjusted by sliding the convex portion of the housing. Therefore, the optical pickup device is configured to be able to adjust the inclination of the lens with respect to the optical axis of the laser light incident on the lens.

  However, in the optical pickup devices disclosed in Patent Documents 1 to 3, since the convex portion arranged in the concave portion slides, the optical pickup device is in a plane perpendicular to the optical axis of the laser light incident on the lens. There is a disadvantage that it is difficult to adjust the position of the lens.

  Therefore, conventionally, in order to eliminate the inconveniences as described above, a lens (first lens) and a light source that emits laser light to the lens are provided, and is perpendicular to the optical axis of the laser light incident on the lens. An optical pickup device capable of adjusting the position of a lens in a smooth plane has been proposed (see, for example, Patent Document 4).

  In the optical pickup device disclosed in Patent Document 4, a lens holder (first lens holding member) that holds a lens is sandwiched between a support plate and a pressing plate. The optical pickup device is configured to be able to adjust the position of the lens in a plane perpendicular to the optical axis of the laser light incident on the lens by adjusting the position of the support plate. Specifically, the support plate is attached to the lens holder attachment portion via a thin plate material by a plate attachment screw, and the position is adjusted by the number of thin plate materials and the tightening degree of the plate attachment screw.

JP 2006-48781 A JP 2007-141359 A JP 2005-71469 A JP 2006-172666 A

  However, in the optical pickup device proposed in Patent Document 4, it is possible to adjust the position of the lens in a plane perpendicular to the optical axis of the laser light incident on the lens (first lens). Since it is necessary to adjust the number of thin plate members arranged between the support plate and the lens holder mounting portion and the tightening degree of the plate mounting screw, the work of adjusting the lens position becomes complicated. is there.

  The present invention solves the above-described problems, and an object of the present invention is to adjust the position of the first lens in a plane perpendicular to the optical axis of the laser light incident on the first lens. It is possible to provide an optical pickup device that can suppress the complicated adjustment work.

  An optical pickup apparatus according to the present invention includes a first lens constituting a first optical system, a first lens holding member that holds the first lens, and a light source that emits laser light to the first lens. The apparatus further includes an adjustment mechanism that adjusts the position of the first lens holding member in a plane perpendicular to the optical axis of the laser light incident on the first lens, and the adjustment mechanism includes the first lens holding member. A biasing member for biasing and an adjustment screw for adjusting the position of the first lens holding member against the biasing force by the biasing member are included. The plane perpendicular to the optical axis of the laser beam includes a plane substantially perpendicular to the optical axis of the laser beam.

  By configuring in this way, as in Patent Document 4, by adjusting the number of thin plate members disposed between the support plate and the lens holder mounting portion and the tightening degree of the plate mounting screws, Unlike the case of adjusting the position, the position of the first lens holding member biased by the biasing member can be adjusted only by adjusting the tightening degree of the adjusting screw. Thereby, it is possible to prevent the work of adjusting the position of the first lens holding member in a plane perpendicular to the optical axis of the laser light incident on the first lens from being complicated.

  The optical pickup device further includes a second lens constituting a second optical system different from the first optical system, and a second lens holding member that holds the second lens and is provided with an adjustment mechanism. The light source may have a function of emitting laser light to the second lens, and may be provided so that the position of the optical axis of the laser light incident on the second lens can be adjusted.

  With this configuration, it is possible to adjust the position of the optical axis of the laser light incident on the second lens by adjusting the position of the light source. For this reason, also in the second lens constituting the second optical system different from the first optical system, the position of the second lens with respect to the optical axis of the laser light incident on the second lens can be adjusted.

  In the optical pickup device including the second lens holding member, the adjustment mechanism includes a holding member that holds the first lens holding member so as to be movable in a first direction orthogonal to the optical axis of the laser light incident on the first lens. The holding member of the adjustment mechanism includes a first lens holding member that is movably held in the first direction, and an optical axis of the laser light incident on the first lens and a second direction orthogonal to the first direction. It may be configured to be movable. The first direction orthogonal to the optical axis of the laser light includes a direction substantially orthogonal to the optical axis of the laser light, and the second direction orthogonal to the optical axis of the laser light and the first direction is a laser. It includes a direction substantially perpendicular to the optical axis of the light and the first direction.

  With this configuration, the first lens holding member is easily incident on the first lens by moving the first lens holding member in the first direction and the second direction using the holding member. It can be moved in a plane perpendicular to the optical axis of the light.

  In the optical pickup device in which the adjustment mechanism includes a holding member, the biasing member may include an attachment portion for attaching the holding member to the second lens holding member so as to be movable in the second direction.

  With this configuration, the holding member can be attached to the second lens holding member so as to be movable in the second direction by the attaching portion of the biasing member, so that the holding member is attached to the second lens holding member. It is possible to suppress an increase in the number of parts compared to the case where the mounting member is separately provided.

  In the optical pickup device in which the adjustment mechanism includes a holding member, the urging member may be attached to the second lens holding member and may include a positioning unit for positioning with respect to the second lens holding member.

  With this configuration, the urging member can be positioned with respect to the second lens holding member by the urging member positioning portion, so that the urging member can be easily attached to the second lens holding member. it can.

  In the optical pickup device, the adjustment screw may be configured such that the tightening degree can be directly adjusted from the side facing the urging member.

  By configuring in this way, it is not necessary to separately provide a mechanism component for adjusting the tightening degree of the adjusting screw, so that it is possible to suppress an increase in the number of components.

  According to the present invention, it is possible to adjust the position of the first lens in a plane perpendicular to the optical axis of the laser light incident on the first lens, and the adjustment work becomes complicated. It is possible to provide an optical pickup device capable of suppressing the above.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic view showing a configuration of an optical pickup device according to an embodiment of the present invention. First, the configuration of the optical pickup device 100 according to the present embodiment will be described with reference to FIG. The optical pickup device 100 is configured to be able to write to and read from an HD-DVD (High Definition-Digital Versatile Disc) and a BD (Blu-ray Disc; registered trademark).

  As shown in FIG. 1, an optical pickup device 100 according to an embodiment of the present invention includes a semiconductor laser 1 that emits a blue-violet laser beam having a wavelength of about 405 nm, a polarization control plate 2 and a PBS (polarization beam splitter) 3. And an optical system 4 for HD-DVD and an optical system 5 for BD. The semiconductor laser 1 is an example of the “light source” of the present invention, and the optical system 4 for HD-DVD and the optical system 5 for BD are respectively “second optical system” and “second optical system” of the present invention. 1 "is an example.

  The polarization control plate 2 and the PBS 3 are provided for switching to which of the optical systems 4 and 5 the laser light emitted from the semiconductor laser 1 is emitted. Specifically, the polarization control plate 2 has a function of emitting laser light emitted from the semiconductor laser 1 while controlling the polarization direction of the incident laser light. The PBS 3 has a function of emitting the laser beam emitted from the polarization control plate 2 and emitting the incident laser beam to the optical system 4 or 5 according to the polarization direction.

  The optical system 4 for HD-DVD includes a diffraction grating 4a, PBS 4b, a collimator lens 4c, a half mirror 4d, a rising mirror 4e, a quarter wavelength plate 4f, an objective lens 4g, and a condenser lens. 4h, the light-receiving part 4i, the cylindrical lens 4j, and the light-receiving part 4k are included.

  The diffraction grating 4a has the function of emitting the laser beam emitted from the PBS 3 and dividing the incident laser beam into three beams.

  The PBS 4b has a function of receiving the laser beam emitted from the diffraction grating 4a and transmitting the incident laser beam to the collimator lens 4c. The PBS 4b also has a function of receiving the reflected light from the HD-DVD and reflecting the incident reflected light to emit it to the cylindrical lens 4j.

  The collimator lens 4c has a function of collimating the laser light incident from the PBS 4b and emitting it to the half mirror 4d, and collimating the reflected light from the HD-DVD to emit it to the PBS 4b. The collimator lens 4c is held by a lens holder 13 (see FIG. 2), which will be described later, and is provided so as to be movable in the Z direction in order to correct spherical aberration. The collimator lens 4c is an example of the “second lens” in the present invention.

  The half mirror 4d has a function of transmitting the laser beam incident from the collimator lens 4c and emitting it to the condenser lens 4h, and reflecting the laser beam incident from the collimator lens 4c to emit it to the upright mirror 4e. . The half mirror 4d also has a function of reflecting the reflected light from the HD-DVD and emitting it to the collimator lens 4c.

  The upright mirror 4e has a function of reflecting the laser beam incident from the half mirror 4d and emitting it to the quarter-wave plate 4f, and reflecting the reflected light from the HD-DVD and emitting it to the half mirror 4d. .

  The quarter-wave plate 4f converts the laser light incident from the rising mirror 4e, which is linearly polarized light, into circularly polarized light and emits it to the objective lens 4g, and linearly reflects the reflected light from the HD-DVD, which is circularly polarized light. It has a function of converting it into polarized light and emitting it to the rising mirror 4e. The quarter wavelength plate 4f is provided in order to make the polarization direction of the reflected light emitted to the rising mirror 4e perpendicular to the polarization direction of the laser light incident from the rising mirror 4e.

  The objective lens 4g is provided for condensing the laser light incident from the quarter wavelength plate 4f on the recording surface of the HD-DVD. The light receiving unit 4i is provided to receive the laser light incident from the condenser lens 4h. The light receiving unit 4i is formed of a PDIC (photodetector IC) or the like, and is provided for detecting the intensity of the laser light emitted from the semiconductor laser 1.

  The cylindrical lens 4j has a function of collecting reflected light from the HD-DVD. The light receiving unit 4k is provided to receive reflected light from the HD-DVD. The light receiving unit 4k is made of a PDIC or the like and has a function of converting the received reflected light into an electric signal.

  The optical system 5 for BD includes a diffraction grating 5a, a PBS 5b, a collimator lens 5c, a half mirror 5d, a quarter wavelength plate 5e, an objective lens 5f, a condenser lens 5g, a light receiving unit 5h, A cylindrical lens 5i and a light receiving portion 5j are included.

  The diffraction grating 5a has a function of emitting the laser beam emitted from the PBS 3 and dividing the incident laser beam into three beams.

  The PBS 5b has a function of receiving the laser beam emitted from the diffraction grating 5a and reflecting the incident laser beam to emit it to the collimator lens 5c. Further, the PBS 5b has a function of receiving the reflected light from the BD and transmitting the incident reflected light to the cylindrical lens 5i.

  The collimator lens 5c has a function of collimating the laser beam incident from the PBS 5b and emitting it to the half mirror 5d, and collimating the reflected light from the BD to emit it to the PBS 5b. The collimator lens 5c is held by a lens holder 16 (see FIG. 2), which will be described later, and is provided so as to be movable in the Z direction in order to correct spherical aberration. The collimator lens 5c is an example of the “first lens” in the present invention. The Z direction is substantially the same direction as the optical axis of the laser light incident on the collimator lens 5c.

  The half mirror 5d transmits the laser light incident from the collimator lens 5c and emits it to the condenser lens 5g, and reflects the laser light incident from the collimator lens 5c and emits it to the quarter wavelength plate 5e. Have The half mirror 5d also has a function of reflecting the reflected light from the BD and emitting it to the collimator lens 5c.

  The quarter-wave plate 5e converts the laser light incident from the half mirror 5d, which is linearly polarized light, into circularly polarized light and emits it to the objective lens 5f, and converts the reflected light from the BD, which is circularly polarized light, into linearly polarized light. And has a function of emitting light to the half mirror 5d. The quarter wavelength plate 5e is provided so that the polarization direction of the reflected light emitted to the half mirror 5d is perpendicular to the polarization direction of the laser light incident from the half mirror 5d.

  The objective lens 5f is provided for condensing the laser light incident from the quarter wavelength plate 5e on the recording surface of the BD. The light receiving unit 5h is provided to receive the laser light incident from the condenser lens 5g. The light receiving portion 5h is made of a PDIC or the like, and is provided for detecting the intensity of the laser light emitted from the semiconductor laser 1.

  The cylindrical lens 5i has a function of collecting reflected light from the BD. The light receiving unit 5j is provided to receive reflected light from the BD. The light receiving unit 5j is made of a PDIC or the like, and has a function of converting the received reflected light into an electric signal.

  FIG. 2 is a perspective view showing a structure of a lens holder driving unit of the optical pickup device according to the embodiment of the present invention. 3-5 is a figure for demonstrating the detailed structure of the adjustment mechanism of the lens holder drive part shown in FIG. Next, the structure of the lens holder driving unit 50 according to the present embodiment will be described with reference to FIGS.

  As shown in FIG. 2, the lens holder driving unit 50 provided in the optical pickup device 100 (see FIG. 1) according to an embodiment of the present invention includes a stepping motor 10 and a lead screw 11 attached to the stepping motor 10. A nut member 12 screwed into the lead screw 11 and a lens holder 13 driven by the stepping motor 10 are provided. The lens holder 13 is an example of the “second lens holding member” in the present invention.

  The stepping motor 10 is provided for rotating the lead screw 11. The nut member 12 has an opening 12 a that engages with the lead screw 11, and is provided to be movable in the Z direction as the lead screw 11 rotates.

  The lens holder 13 is placed on the guide rails 14a and 14b. The lens holder 13 has a shaft insertion hole 13a and is supported by a guide shaft 15 inserted into the shaft insertion hole 13a. Further, the lens holder 13 is formed with an engaging portion 13 b that engages with the nut member 12. Accordingly, the lens holder 13 is configured to move in the Z direction as the nut member 12 moves in the Z direction.

  Here, in the present embodiment, the lens holder 13 is formed with a lens holder mounting portion 13c adjacent to the shaft insertion hole 13a in the X direction, and also in the X direction with respect to the lens holder mounting portion 13c. A lens mounting portion 13d is formed so as to be adjacent to each other. The lens holder attaching portion 13c is provided with an adjusting mechanism 20 that adjusts the position of the lens holder 16 that holds the collimator lens 5c. The lens holder 16 is attached to the lens holder attaching portion 13c by the adjusting mechanism 20. . The lens holder 16 is an example of the “first lens holding member” in the present invention.

  The adjusting mechanism 20 is provided to adjust the position of the lens holder 16 in a plane substantially perpendicular to the optical axis of the laser light incident on the collimator lens 5c. A collimator lens 4c is attached to the lens attachment portion 13d. Further, the position of the optical axis of the laser light incident on the collimator lens 4c is adjusted by adjusting the position of the semiconductor laser 1 (see FIG. 1).

  As shown in FIG. 3, the adjustment mechanism 20 includes a holding member 21 that holds the lens holder 16, a leaf spring member 22 that biases the lens holder 16, and an adjustment screw that adjusts the position of the lens holder 16. 23a and 23b, and a mounting screw 24 for mounting the leaf spring member 22 to the lens holder mounting portion 13c. The lens holder mounting portion 13c of the lens holder 13 is formed with an opening 131c for allowing laser light to pass therethrough and a protruding portion 132c protruding in the Y direction. The leaf spring member 22 is an example of the “biasing member” in the present invention.

  The holding member 21 holds the lens holder 16 so as to be movable in the Y direction, and is provided so as to be movable in the X direction together with the held lens holder 16. Specifically, the holding member 21 extends in the Y direction from the rod-shaped portion 21a extending in the X direction, a pair of rod-shaped portions 21b extending in the Z direction from both ends of the rod-shaped portion 21a, and the ends of the rod-shaped portion 21b, respectively. And a pair of guide portions 21c. The Y direction is a direction substantially orthogonal to the Z direction, and the X direction is a direction substantially orthogonal to the Z direction and the Y direction. The X direction and the Y direction are examples of the “second direction” and the “first direction” in the present invention, respectively.

  As shown in FIG. 4, the rod-shaped portion 21 a is provided so as to be adjacent to the protruding portion 132 c of the lens holder mounting portion 13 c when viewed in plan. The distance D1 between the pair of rod-like parts 21b is formed to be larger than the width W1 of the protruding part 132c. Thereby, the holding member 21 is configured to be movable in the X direction with respect to the lens holder attaching portion 13c until the rod-like portion 21b comes into contact with the protruding portion 132c. Note that by adjusting the distance D1 and the width W1, it is possible to adjust the amount of movement of the holding member 21 that is movable in the X direction with respect to the lens holder mounting portion 13c.

  The guide portion 21c is provided to guide the side surface 16a of the lens holder 16 in the Y direction (see FIG. 3). For this reason, the distance D2 between the pair of guide portions 21c is formed to be slightly larger than the width W2 of the lens holder 16. Moreover, the guide part 21c is provided so that it may adjoin in the Z direction with the protrusion part 16b which protrudes in the X direction from the side surface 16a of the lens holder 16, and the protrusion part 16b of the lens holder 16 is the lens holder attaching part 13c and the Z direction. Are adjacent to each other. That is, the distance D3 from the rod-shaped portion 21a to the guide portion 21c is formed to be slightly larger than the total length of the length L1 of the lens holder mounting portion 13c and the length L2 of the protruding portion 16b of the lens holder 16. ing. Thereby, the position of the lens holder 16 in the Z direction is regulated.

  As shown in FIG. 3, the leaf spring member 22 is formed in a leaf spring portion 22a for urging the lens holder 16 in the Y direction (downward), a screw insertion hole 22b into which the mounting screw 24 is inserted, and a protruding portion 132c. A positioning hole 22c to be inserted into the positioning protrusion 133c and a protrusion 22d for attaching the holding member 21 to the lens holder attaching portion 13c. The positioning hole 22c is an example of the “positioning portion” in the present invention, and the protruding portion 22d is an example of the “mounting portion” in the present invention.

  As shown in FIG. 4, the leaf spring portion 22 a is disposed on a region corresponding to the lens holder 16 when viewed in plan. The positioning hole 22c is provided for positioning the leaf spring member 22 with respect to the lens holder mounting portion 13c. The protruding portion 22d is disposed on a region corresponding to the rod-like portions 21a and 21b of the holding member 21, and is provided so as to sandwich the holding member 21 with the lens holder mounting portion 13c.

  The adjustment screws 23a and 23b are attached to the screw attachment holes 134c of the lens holder attachment portion 13c, as shown in FIG. 5 (the view of the adjustment mechanism 20 of FIG. 2 viewed from the back side). Further, the lens holder 16 is formed with a protruding portion 16c protruding in the Z direction, and the protruding portion 16c is disposed inside the opening 131c of the lens holder mounting portion 13c. The adjustment screws 23a and 23b are in contact with the projecting portion 16c at the tip portions, and support the lens holder 16 urged downward (Y direction) by the leaf spring member 22.

  The adjustment screw 23a is provided so as to be movable in the A direction inclined about 45 degrees with respect to the X direction and the Y direction, and the adjustment screw 23b is inclined about 45 degrees with respect to the X direction and the Y direction, and A It is provided so as to be movable in the B direction substantially orthogonal to the direction. That is, the adjustment screw 23a can adjust the position of the lens holder 16 with respect to the lens holder mounting portion 13c in the A direction, and the adjustment screw 23b can adjust the position of the lens holder 16 with respect to the lens holder mounting portion 13c in the B direction. is there. Therefore, the adjusting screws 23a and 23b are provided so that the position of the lens holder 16 with respect to the lens holder mounting portion 13c can be adjusted in the X direction and the Y direction by tightening. The adjusting screws 23a and 23b are provided so that the tightening degree can be directly adjusted from the lower side of the lens holder mounting portion 13c, that is, the side facing the leaf spring member 22.

  The attachment screw 24 is attached to a screw attachment hole 135c (see FIG. 3) formed in the protruding portion 132c via the screw insertion hole 22b of the leaf spring member 22. Thereby, the leaf | plate spring member 22 is attached on the protrusion part 132c of the lens holder attaching part 13c.

  In the present embodiment, as described above, by providing the adjustment mechanism 20 having the leaf spring member 22 and the adjustment screws 23a and 23b, the support plate and the lens holder mounting portion are provided as described in Patent Document 4 above. Unlike the case where the position of the lens holder is adjusted by adjusting the number of thin plate members arranged between them and the tightening degree of the plate mounting screw, the plate is obtained only by adjusting the tightening degree of the adjusting screws 23a and 23b. The position of the lens holder 16 biased by the leaf spring portion 22a of the spring member 22 can be adjusted. Thereby, it is possible to prevent the operation of adjusting the position of the lens holder 16 in a plane substantially perpendicular to the optical axis of the laser light incident on the collimator lens 5c from being complicated. As a result, in the optical pickup device 100, the occurrence of coma aberration in the BD optical system 5 can be easily suppressed.

  In the present embodiment, the position of the semiconductor laser 1 is adjusted to adjust the position of the optical axis of the laser light incident on the collimator lens 4c, thereby making the HD-DVD different from the BD optical system 5. Also in the collimator lens 4c constituting the optical system 4 for use, the position of the collimator lens 4c relative to the optical axis of the laser light incident on the collimator lens 4c can be adjusted. Thereby, also in the optical system 4 for HD-DVD, it can suppress that coma aberration generate | occur | produces.

  In the present embodiment, the lens holder 16 is held so as to be movable in the Y direction, and the holding member 21 that is movable in the X direction while holding the lens holder 16 is provided. By moving the holder 16 in the X direction and the Y direction, the lens holder 16 can be easily moved in a plane substantially perpendicular to the optical axis of the laser light incident on the collimator lens 5c. .

  Further, in the present embodiment, by forming the protruding portion 22d on the leaf spring member 22, the holding member 21 can be sandwiched between the lens holder mounting portion 13c by the protruding portion 22d. It is possible to suppress an increase in the number of parts compared to a case where a mounting member for mounting on the holder mounting portion 13c is separately provided.

  In the present embodiment, the lens holder mounting portion 13c is formed with the positioning protrusion 133c, and the leaf spring member 22 is formed with the positioning hole 22c, thereby inserting the positioning protrusion 133c into the positioning hole 22c. Since the leaf spring member 22 can be positioned with respect to the attachment portion 13 c, the leaf spring member 22 rotates with the rotation of the attachment screw 24 when the leaf spring member 22 is attached to the lens holder attachment portion 13 c with the attachment screw 24. It can suppress moving. Therefore, the leaf spring member 22 can be easily attached to the lens holder attaching portion 13c.

  Further, in the present embodiment, by providing the adjusting screws 23a and 23b so that the tightening degree can be directly adjusted from the lower side of the lens holder attaching portion 13c, a mechanical component for adjusting the tightening degree of the adjusting screws 23a and 23b is separately provided. Since it is not necessary to provide, it can suppress that the number of parts increases.

  The present invention can adopt various embodiments other than those described above. For example, in the above-described embodiment, the optical pickup device 100 that can write to and read from HD-DVD and BD is shown. However, the present invention is applied to an optical pickup device that can write and read from CD and DVD. May be.

  In the above embodiment, the lens holder 13 is placed on the guide rails 14a and 14b and supported by the guide shaft 15. However, the lens holder 13 is parallel to the guide shaft 15 instead of the guide rails 14a and 14b. A lens guide 13 may be supported by the guide shaft 15 and the sub-guide shaft by providing an extended sub-guide shaft and forming a groove in the lens holder 13 where the sub-guide shaft is disposed.

  In the above embodiment, an adjustment mechanism 20 for adjusting the position of the collimator lens 5c of the optical system 5 for BD is provided, and an example in which the collimator lens 4c of the optical system 4 for HD-DVD is attached to the lens holder 13 is shown. However, an adjustment mechanism for adjusting the position of the collimator lens of the optical system for HD-DVD may be provided, and the collimator lens of the optical system for BD may be attached to the lens holder.

  Moreover, in the said embodiment, although the lens holder 16 holding the collimator lens 5c was shown, you may apply this invention to the lens holder holding lenses other than a collimator lens.

  In the above-described embodiment, when adjusting the position of the optical axis of the laser light incident on the collimator lens 4c by adjusting the position of the semiconductor laser 1, the adjustment mechanism having the same configuration as the adjustment mechanism 20 has a semiconductor. A laser 1 may be provided and the position of the semiconductor laser 1 may be adjusted.

It is the schematic which showed the structure of the optical pick-up apparatus by one Embodiment of this invention. It is the perspective view which showed the structure of the lens holder drive part of the optical pick-up apparatus by one Embodiment of this invention. It is a disassembled perspective view of the adjustment mechanism of the lens holder drive part shown in FIG. It is a top view of the adjustment mechanism of the lens holder drive part shown in FIG. It is the perspective view which showed the back side of the adjustment mechanism of the lens holder drive part shown in FIG.

Explanation of symbols

1 Semiconductor laser (light source)
4 Optical system (second optical system)
4c Collimator lens (second lens)
5 Optical system (first optical system)
5c Collimator lens (first lens)
13 Lens holder (second lens holding member)
16 Lens holder (first lens holding member)
20 adjustment mechanism 21 holding member 22 leaf spring member (biasing member)
22c Positioning hole (positioning part)
22d Protruding part (mounting part)
23a, 23b Adjustment screw 100 Optical pickup device

Claims (6)

A first lens constituting a first optical system;
A first lens holding member for holding the first lens;
An optical pickup device comprising: a light source that emits laser light to the first lens;
An adjustment mechanism for adjusting the position of the first lens holding member in a plane perpendicular to the optical axis of the laser light incident on the first lens;
The adjustment mechanism includes a biasing member that biases the first lens holding member, and an adjustment screw for adjusting the position of the first lens holding member against a biasing force by the biasing member. An optical pickup device characterized by the above. The optical pickup device according to claim 1,
A second lens constituting a second optical system different from the first optical system;
A second lens holding member that holds the second lens and is provided with the adjustment mechanism;
The optical source has a function of emitting laser light to the second lens, and is provided so that the position of the optical axis of the laser light incident on the second lens can be adjusted. . The optical pickup device according to claim 2,
The adjustment mechanism includes a holding member that holds the first lens holding member so as to be movable in a first direction orthogonal to an optical axis of laser light incident on the first lens;
The holding member of the adjustment mechanism is coupled to the first lens holding member that is movably held in the first direction, and is orthogonal to the optical axis of the laser light incident on the first lens and the first direction. An optical pickup device configured to be movable in two directions. The optical pickup device according to claim 3,
The urging member includes an attachment portion for attaching the holding member to the second lens holding member so as to be movable in the second direction. In the optical pick-up device according to claim 3 or 4,
The biasing member is attached to the second lens holding member and includes a positioning portion for positioning with respect to the second lens holding member. The optical pickup device according to any one of claims 1 to 5,
The optical pick-up apparatus, wherein the adjusting screw is configured to be capable of directly adjusting a tightening degree from a side facing the urging member.

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