JP2009087495A - Optical pickup device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical pickup device capable of stably holding a collimator lens regardless of a compact configuration. <P>SOLUTION: An abutting part 2b of a holder 2 is energized to a housing 1 by using a spring part 20c of a holding member 20 for attaching a monitor light receiving element 7 to the housing 1. Thus, while position adjustment of a collimator lens 3 in an optical axis direction is enabled, the optical pickup device is made compact and reduced in cost by commonalization of components. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical pickup device, and more particularly to an optical pickup device capable of recording and / or reproducing information with respect to an optical disc and having a compact configuration.

An optical pickup device capable of recording and / or reproducing information on an optical disk represented by a CD or a DVD has been developed. In addition, development of an optical pickup device capable of recording and / or reproducing information on a high-density optical disk such as a Blu-ray Disc or an HD DVD using a blue-violet semiconductor laser having a wavelength of about 400 nm is rapidly progressing.
JP 09-44891 A JP-A-2005-149607

  By the way, when recording and / or reproducing information with respect to a high-density optical disk, a semiconductor laser that emits a light beam of about 400 nm is often used. There is a problem that it varies greatly. When the wavelength of the emitted light beam is greatly shifted with respect to the reference wavelength, spherical aberration occurs in the converging spot, and the recording / reproducing performance varies depending on the wavelength variation, and this may cause a problem. . In addition, with respect to the optical elements constituting the condensing optical system of the optical pickup device, particularly the objective lens, spherical aberration due to manufacturing errors is likely to occur, which may cause a deterioration in recording / reproducing performance. One method for correcting such spherical aberration is to adjust the position of the semiconductor laser in the optical axis direction of the condensing optical system during assembly.

  However, when the semiconductor laser is moved in the optical axis direction, the light collection position in the optical axis direction of the reflected light from the optical disk on the photodetector is also shifted. This shift can be corrected by adjusting the position of the servo lens that collects the reflected light from the optical disk on the photodetector, but this causes a problem that the magnification of the optical system from the optical disk to the photodetector changes. is there.

  On the other hand, the optical detector itself can be corrected by adjusting it in the optical axis direction. However, since the optical detector also requires position adjustment in the direction orthogonal to the optical axis, it is held only by the adhesive to the optical pickup body. As a result, the distance between the optical pickup body and the photodetector varies according to the variation of the spherical aberration described above, and the stability of the position of the photodetector with respect to environmental changes such as temperature, There is a problem that a difference occurs in each optical pickup.

  In addition, spherical aberration correction in the entire optical pickup device is performed by receiving the light beam actually reflected by the information recording surface of the optical disc with a photodetector through a condensing optical system including an objective lens, and using the signal. However, when the adjustment in the optical axis direction of the semiconductor laser is performed, the movement in the direction perpendicular to the optical axis also becomes the movement of the light spot on the photodetector, so that the signal is not stable and adjustment is difficult. There's a problem.

  In contrast, for example, when the optical pickup device is assembled, the amount of spherical aberration on the information recording surface of the optical disk is allowed by adjusting the position of the collimating lens in the optical axis direction and changing the divergence of the light beam incident on the objective lens. It may be within the range.

  Here, when the collimating lens is provided in the optical pickup device, the longer the focal length of the collimating lens is advantageous in terms of error sensitivity in the positional relationship between the semiconductor laser and the collimating lens, and the collimating lens is arranged between the objective lens and the rising mirror. If it is arranged between them, a compact layout is possible while using a collimating lens having a long focal length. In an optical pickup device having a relatively large dimensional tolerance in a direction orthogonal to the information recording surface of an optical disc, such a layout is often selected (see Patent Document 1).

  In such a layout, since a collimating lens is provided in a common optical path of a system in which the light beam from the semiconductor laser goes to the optical disk (outward path) and a system in which the reflected light from the optical disk goes to the photodetector (return path), Even if the collimating lens is moved in the direction of the optical axis to correct spherical aberration, there is no need to make corrections by moving the photodetector in the direction of the optical axis. is there.

  In such a case, there is a problem of how to adjust the position of the collimating lens. On the other hand, Patent Document 2 discloses a configuration capable of adjusting the collimating lens held by the lens holder in the optical axis direction. However, since the lens holder of Patent Document 2 is supported by an integrally formed spring piece, the shape of the lens holder is complicated and disadvantageous in terms of cost, and the length of the spring piece in the optical axis direction. Because of its short length, it is difficult to move the lens holder smoothly without being caught, and if the contact surface of the spring piece is not smoothed by post-processing, the movement of the holder is hindered by the bending of the spring piece, and therefore the collimating lens and the semiconductor There is a problem that it is difficult to accurately adjust the collimating lens in the optical axis direction while maintaining the positional relationship with the laser and the objective lens with high accuracy.

  On the other hand, when the monitor light-receiving element for monitoring the power of the semiconductor laser is provided in the optical pickup device of Patent Document 2, it is often provided behind a rising mirror that bends the light beam from the semiconductor laser to the objective lens side. However, when the monitor light receiving element is arranged in this way, if the arrangement of the rising mirror and the monitor light receiving element is determined while securing the effective diameter of the light beam, the sufficient contact length of the spring piece cannot be ensured and positioning is performed. There is also a problem that becomes unstable.

  The present invention has been made in view of such a problem, and an object thereof is to provide an optical pickup device that can stably hold a collimating lens while having a compact configuration.

The optical pickup device according to claim 1 includes a light source, a rising mirror that reflects light emitted from the light source, a condensing optical system including an objective optical element, the rising mirror, and the objective optical element. An optical pickup device in which an optical element unit including a collimating lens disposed between and a holder for holding the collimating lens, and a monitor light receiving element that receives a part of a light beam from the light source are attached to a housing. And
A part of a holding member for attaching the monitor light receiving element to the housing urges the optical element unit toward the housing.

  According to the present invention, the optical element unit is urged toward the housing by using a part of the holding member for attaching the monitor light receiving element to the housing, so that the position of the collimating lens in the optical axis direction is While making adjustment possible, it is possible to reduce the size and cost of the optical pickup device by using common parts. After adjustment, the optical element unit is preferably bonded to the housing.

  According to a second aspect of the present invention, in the optical pickup device according to the first aspect, a part of the light beam emitted from the light source transmits the rising mirror, and the monitor light receiving element transmits the transmitted light beam. Since a part of the light is received, there is no need to separately provide branching means for branching toward the monitor light receiving element, and the optical pickup device can be made compact. However, it is not always necessary to use the monitor light receiving element at the position where the light beam that has passed through the rising mirror is incident.

  According to a third aspect of the present invention, in the optical pickup device according to the first or second aspect, the holder is configured to hold the collimating lens and a holder that contacts the housing and guides the holding section in a predetermined direction. A contact portion, and the monitor light receiving element is disposed between the contact portion and the rising mirror, so that a divergent light beam is incident on the rising mirror, etc. The light quantity of the light beam incident on the monitor light receiving element can be increased. Here, the “contact portion” refers to a portion that comes into contact with the housing in a state where it can move at least in the optical axis direction of the collimator lens when the holder is biased from the holding member.

  According to a fourth aspect of the present invention, in the optical pickup device according to the first or second aspect, the holder is configured to hold the collimating lens, and to contact the housing to guide the holding unit in a predetermined direction. The contact portion is disposed between the monitor light receiving element and the rising mirror, and has an opening that transmits a light beam. Can be made as close to the rising mirror as possible, so that when the position of the collimating lens is adjusted in the optical axis direction, shift errors and tilt errors of the optical axis can be suppressed.

  The optical pickup device according to claim 5 is the invention according to any one of claims 1 to 4, wherein the holding member is formed of a resin having electrical insulation. Contact with the monitor light receiving element terminals, wiring, etc. has no effect, and the degree of freedom in shape can be increased.

  An optical pickup device according to a sixth aspect of the present invention is the optical pickup device according to any one of the first to fifth aspects, wherein the holding member holds the monitor light receiving element, and extends from the holding portion. A spring part for biasing the element unit, and the spring part is formed at an interval, so that the light flux can be passed through the spring part while realizing stable biasing. Light can be received by the light receiving element.

  An optical pickup device according to a seventh aspect is the invention according to any one of the first to sixth aspects, wherein the monitor light receiving element is attached to a flexible substrate, and the holding member reinforces the flexible substrate. Thus, there is no need to separately reinforce the flexible substrate, and the optical pickup device can be made more compact.

  ADVANTAGE OF THE INVENTION According to this invention, the optical pick-up apparatus which can hold | maintain a collimating lens stably can be provided, although it is a compact structure.

  Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings. FIG. 1 is a cross-sectional view schematically showing an optical pickup device according to the present embodiment. FIG. 2 is a cross-sectional view of the configuration of FIG. 1 cut along a plane including the line II-II and viewed in the direction of the arrow. 3 is an enlarged view of a portion indicated by an arrow III in the optical pickup device of FIG. FIG. 4 is a diagram of the configuration of FIG. 3 as viewed in the direction of arrow IV. FIG. 5 is an exploded perspective view showing the holder, the holding member, and the monitor light receiving element.

  The optical pickup device according to the present embodiment can reproduce information from three types of optical discs of HD DVD, DVD, and CD. However, a diffraction grating or the like that generates a light beam for tracking is added. Thus, it is possible to record information. Furthermore, it is sufficient that information can be recorded / reproduced on at least one type of optical disk.

  In FIG. 3, a recess 1a having a bottom surface 1b and a support surface 1c intersecting at right angles to the bottom surface 1b are formed on the top surface of the housing 1, and a main opening 1d is formed on the bottom surface 1b. Is formed with a sub-opening 1e. A facing surface 1f is formed on the side facing the support surface 1c.

  As shown in FIG. 5, the holder 2 includes a holding portion 2 a that holds the collimating lens 3 in the opening, and a plate-like contact that is connected to one end of the holding portion 2 a and extends in the optical axis direction of the collimating lens 3. Part 2b. On the surface of the contact portion 2b on the collimator lens 3 side, a semi-cylindrical guide convex portion 2d extends vertically on one side (left side in FIG. 5) across the through opening 2c formed in the center. A hemispherical support convex portion 2e is formed on the other side (right side in FIG. 5). The holder 2 is integrally formed of a resin material, has a light and advantageous configuration against vibration shock, and can easily improve the flatness of both surfaces of the contact portion 2b. However, the holder 2 may be integrally formed from the same resin as the collimating lens 3. The holder 2 and the collimating lens 3 constitute an optical element unit.

  The holding member 20 is integrally formed of a resin material, and has a rectangular plate-like base 20a that is a holding portion, a plate portion 20b that extends in a substantially perpendicular direction from the upper end of the base 20a, and a distance from the plate portion 20b. And a spring portion 20c extending downward along the base 20a in a bifurcated manner. The center of the spring portion 20c is bent in a “<” shape so as to protrude outward. The monitor light receiving element 7 is bonded to the surface of the flexible substrate 7a.

  At the time of assembly, first, the holding member 20 is attached with a double-sided tape or the like so that the surface of the base 20a on the spring portion 20c side is in close contact with the back surface of the flexible substrate 7a. Then, as shown in FIG. 3, the plate portion 20b is positioned above the monitor light receiving element 7, and the spring portion 20c turns around the front (light receiving surface side) of the monitor light receiving element 7, but the spring portion 20c is bifurcated. Therefore, the light beam incident on the monitor light receiving element 7 is not blocked. Since the base 20a is in close contact with the flexible substrate 7a and has a reinforcing function, handling and assembly are facilitated.

  As shown in FIG. 3, the holding member 20 assembled with the monitor light receiving element 7 is pushed in from below the housing 1, and the back surface of the base 20 a (the side opposite to the monitor light receiving element 7) is opposed to the opposite surface of the housing 1. It adheres to If. At this time, the plate portion 20b of the holding member 20 comes into contact with the step portion 1g that defines the upper end of the facing surface 1f, and further intrusion is restricted. In this state, the holding member 20 is bonded to the housing 1.

  Next, the holder 2 is inserted so that the contact portion 2b is inserted between the facing surface 1f and the support surface 1c, and the holding portion 2a holding the collimating lens 3 is disposed in the concave portion 1a. At this time, as shown in FIG. 4, the guide convex portion 2d of the holder 2 is engaged with the tapered cross-sectional groove 1h formed on the support surface 1c and extending vertically, and the support convex portion 2e is formed on the support surface 1c. By abutting, the optical axis of the collimating lens 3 is positioned with respect to the support surface 1c so as to coincide with the optical axis of the objective lens 10 described later.

  Since the spring portion 20c of the holding member 20 contacts the back surface of the contact portion 2b inserted between the facing surface 1f and the support surface 1c while being elastically deformed, the spaced spring portions 20c support the holder 2. By stably energizing toward the surface 1c (see FIG. 4), the optical axis of the collimating lens 3 and the optical axis of the objective lens 10 are kept in agreement. Thereby, even when the holder 2 is displaced in order to adjust the position of the collimating lens 3 in the optical axis direction, the guide convex portion 2d is guided to the tapered cross-sectional groove 1h, so that the deviation between both optical axes occurs. There is no such thing. After adjusting the position of the collimating lens 3, the holder 2 is bonded and fixed to the housing 1.

  According to the present embodiment, the contact portion 2b of the holder 2 is urged toward the housing 1 using the spring portion 20c of the holding member 20 for attaching the monitor light receiving element 7 to the housing 1, so that the collimating lens While the position adjustment in the direction of the optical axis 3 is possible, it is possible to reduce the size and cost of the optical pickup device by using common parts.

  Next, the operation of the optical pickup device according to this embodiment will be described. The components of the optical pickup device described below are attached to the housing 1 directly or indirectly. In FIG. 2, when information is reproduced from an HD DVD, when the first semiconductor laser 5 as a light source is caused to emit light, the laser beam having a wavelength of about 405 nm emitted from the first semiconductor laser 5 is reflected by the blue-violet polarizing beam splitter 6. Further, the light is reflected by the rising mirror 4, but a part thereof passes through the rising mirror 4. The passing light passes through the sub-opening 1e of the support surface 1c, passes through the through-opening 2c of the holder 2, passes between the bifurcated spring portions 20c of the holding member 20, and is detected by the monitor light receiving element 7. . A signal output from the monitor light receiving element 7 according to the amount of received light is output to an external circuit (not shown) via the flexible substrate 7a, and the power of the first semiconductor laser 5 is controlled. The light beam reflected by the rising mirror 4 passes through the collimating lens 3 and the λ / 4 wavelength plate 9 and is condensed on the information recording surface of the HD DVD via the objective lens (also referred to as objective optical element) 10. .

  The light beam reflected from the information recording surface of the HD DVD passes through the objective lens 10, the λ / 4 wavelength plate 9 and the collimator lens 3, is reflected by the rising mirror 4, and is converted into a blue-violet polarizing beam splitter 6 and a polarizing beam splitter 11. , And enters the photodetector 13 through the servo lens 12, so that information can be reproduced from the HD DVD using the output signal.

  Here, a change in the shape of the light spot and a change in the intensity distribution on the photodetector 13 are detected to perform focus detection and track detection. Based on this detection, the actuator 14 can perform focusing and tracking drive integrally with the bobbin by the actuator 14 so that the light beam from the first semiconductor laser 5 is imaged on the information recording surface of the HD DVD. ing.

  When reproducing information from a DVD, when the second semiconductor laser in the two-laser one package 15 is caused to emit light, a laser beam having a wavelength of around 660 nm emitted from the two-laser one package 15 passes through the CD diffraction grating 16 and is polarized beam splitter. 11, passes through the blue-violet polarizing beam splitter 6, and further reflects from the rising mirror 4, but part of the light passes through the rising mirror 4 and is detected by the monitor light receiving element 7. The light beam reflected by the rising mirror 4 passes through the collimating lens 3 and the λ / 4 wavelength plate 9 and is condensed on the information recording surface of the DVD via the objective lens 10.

  The light beam reflected from the information recording surface of the DVD passes through the objective lens 10, the λ / 4 wavelength plate 9 and the collimator lens 3, is reflected by the rising mirror 4, and passes through the blue-violet polarizing beam splitter 6 and the polarizing beam splitter 11. Since it passes through and enters the photodetector 13 through the servo lens 12, information can be reproduced from the DVD using the output signal.

  Here, a change in the shape of the light spot and a change in the intensity distribution on the photodetector 13 are detected to perform focus detection and track detection. Based on this detection, the actuator 14 can perform focusing and tracking drive integrally with the bobbin by the actuator 14 so that the light beam from the second semiconductor laser is imaged on the information recording surface of the DVD. .

  When information is reproduced from the CD, when the third semiconductor laser in the two-laser one package 15 is caused to emit light, the laser light beam having a wavelength of about 785 nm emitted from the CD enters the CD diffraction grating 16 and the tracking signal. ± 1st order diffracted light is generated. The laser beam is reflected by the polarizing beam splitter 11, passes through the blue-violet polarizing beam splitter 6, and further reflected by the rising mirror 4, but part of the laser beam passes through the rising mirror 4 and passes through the monitor light receiving element 7. Is detected. The light beam reflected by the rising mirror 4 passes through the collimating lens 3 and the λ / 4 wavelength plate 9 and is condensed on the information recording surface of the CD via the objective lens 10.

  The light beam reflected from the information recording surface of the CD passes through the objective lens 10, the λ / 4 wavelength plate 9, and the collimator lens 3, is reflected by the rising mirror 4, and passes through the blue-violet polarizing beam splitter 6 and the polarizing beam splitter 11. Since it passes through and enters the photodetector 13 via the servo lens 12, information can be reproduced from the CD using the output signal.

  Here, a change in the shape of the light spot and a change in the intensity distribution on the photodetector 13 are detected to perform focus detection and track detection. Based on this detection, the actuator 14 can be focused and tracked integrally with the bobbin by the actuator 14 so that the light beam from the third semiconductor laser is imaged on the information recording surface of the CD. .

  FIG. 6 is a diagram illustrating a modification of the present embodiment. In FIG. 6, arms 20d and 20d each having a hook shape are integrally formed in a cantilever manner on both side edges of the base 20a of the holding member 20 '. On the other hand, recesses 1j and 1j are formed on the side walls defining both sides of the facing surface 1f of the housing 1. When the holding member 20 ′ to which the monitor light receiving element 7 is bonded is pushed from the lower side of the housing 1 as shown in FIG. 6, the arms 20d and 20d that are in contact with both side walls of the facing surface 1f are assembled. Slides while being elastically deformed, and finally the flange portion at the tip is engaged with the recesses 1j and 1j. In this state, the holding member 20 ′ is prevented from falling off the housing 1, and the holding member 20 ′ can be assembled without using an adhesive. About another structure, it is the same as that of embodiment mentioned above. A screw may be used to fix the holding member and the housing.

  FIG. 7 is a diagram showing another modification of the present embodiment. A rectangular opening 20e that is slightly smaller in size than the monitor light receiving element 7 is formed in the base 20a of the holding member 20 ″. The rectangular opening 20e is fitted into the rectangular opening 20e from the back side. Is elastically deformed, whereby the monitor light-receiving element 7 can be held by the holding member 20 ″. The flexible substrate 7a is sandwiched between the facing surface 1f and the base 20a when the holding member 20 "fitted with the monitor light receiving element 7 is assembled to the housing 1, but a double-sided tape or the like is attached to the base 20a. Other configurations are the same as those in the above-described embodiment.

  FIG. 8 is a view similar to FIG. 3 showing the second embodiment. FIG. 9 is a perspective view of a holder used in the second embodiment. FIG. 10 is a diagram of the configuration of FIG. In the present embodiment, the holder 2 ′ is similar to the configuration shown in FIG. 5, but the guide convex portion 2 d and the support convex portion 2 e are the back surface of the contact portion 2 b (surface away from the collimating lens 3). ).

  At the time of assembly, the holding member 20 shown in FIG. 5 is turned upside down, the flexible substrate 7a is bonded to the back surface of the base 20a, and the base 20a is attached to the surface on the rising mirror 4 side of the support wall 1c ′ of the housing 1. It adheres (FIG. 8). Therefore, the monitor light receiving element 7 is disposed on the rising mirror 4 side from the support wall 1c '. On the other hand, when the plate portion 20b of the holding member 20 comes into contact with the lower edge of the support wall 1c ', the spring portion 20c extends toward the facing surface 1f so as to wrap around the plate portion 20b.

  Next, the holder 2 ′ is inserted so that the contact portion 2 b is inserted between the facing surface 1 f and the support wall 1 c ′. At this time, as shown in FIG. 10, the guide convex portion 2d of the holder 2 ′ is engaged with the tapered cross-sectional groove 1h formed on the facing surface 1f, and the support convex portion 2e is in contact with the support surface 1c. The optical axis of the collimating lens 3 is positioned with respect to the support surface 1c so as to coincide with the optical axis of the objective lens 10 described later.

  Here, since the spring portion 20c of the holding member 20 abuts against the surface of the contact portion 2b (the surface on the support wall 1c ′ side) while elastically deforming, the spring portion 20c faces the holder 2 toward the support surface 1c. By energizing them (see FIG. 10), the optical axis of the collimating lens 3 and the optical axis of the objective lens 10 are kept in agreement. Thereby, even when the holder 2 'is displaced in order to adjust the position of the collimating lens 3 in the optical axis direction, the optical axes are not displaced. After adjusting the position of the collimating lens 3, the holder 2 is bonded and fixed to the housing 1.

  FIG. 11 is a view similar to FIG. 2 showing the third embodiment. In the present embodiment, a blue-violet polarizing beam splitter 6 as a branching unit passes a part of the light beam from the first semiconductor laser 5, and from the second and third semiconductor lasers. The monitor light receiving element 7 is arranged at a position where each light beam is incident. That is, the monitor light receiving element 7 is not disposed behind the raising mirror 4. The holding member 30 that is bonded to the housing 1 while holding the monitor light-receiving element 7 has a spring portion 30 c that abuts against the abutting portion 2 b of the holder 2 and biases the housing 1.

  In the embodiment shown in FIG. 10, the guide protrusion 2 d is provided on the holder 2 ′ and the tapered cross-sectional groove 1 h is provided on the housing 1. However, the present invention is not limited to this. FIG. 12 is a view similar to FIG. 10 showing the fourth embodiment. In the present embodiment, a guide convex portion 1 h ′ and a support convex portion 1 k having the same shape as the embodiment of FIG. 10 are formed on the facing surface 1 f side of the housing 1. The guide convex portion 1h ′ engages with the taper cross-sectional groove 2d ′ formed on the back surface (the surface away from the collimating lens 3) of the contact portion 2b of the holder 2 ″ and extends in the vertical direction. 1k abuts against the back surface of the abutting portion 2b, so that the optical axis of the collimating lens 3 is positioned with respect to the opposing surface 1f so that it coincides with the optical axis of the objective lens 10. The present embodiment can also be applied to the configuration.

  FIG. 13 is a view similar to FIG. 10 showing the fifth embodiment. In the present embodiment, a guide convex portion 1 h ′ having the same shape as that of the embodiment of FIG. 10 is formed on the facing surface 1 f side of the housing 1. The guide convex portion 1h ′ engages with a taper cross-sectional groove 2d ′ formed on the back surface (surface away from the collimating lens 3) of the contact portion 2b of the holder 2 ′ ″ and extending vertically, and the holder 2 Since the support convex part 2e of “′” is in contact with the opposing surface 1f, the optical axis of the collimating lens 3 is positioned with respect to the opposing surface 1f so as to coincide with the optical axis of the objective lens 10. Note that this embodiment can be applied to configurations other than those shown in FIG.

  FIG. 14 is a view similar to FIG. 3 showing the sixth embodiment. FIG. 15 is a perspective view of a main part of the configuration of FIG. In the present embodiment, a λ / 4 wavelength plate 9 is fixedly disposed above the collimating lens 3 in the opening of the holding portion 2 a of the holder 2. Here, since the collimating lens 3 is protruded from the surface on the bottom surface 1b side of the holding portion 2a of the holder 2, when the position of the collimating lens 3 is adjusted, the contact portion 2b of the holder 2 is maximized on the bottom surface 1b side. It is desirable to form the convex part 3a in the flange part or to provide a circular counterbore 1n or the like so that the optical surface of the collimating lens 3 does not interfere with other parts such as the housing 1 even in the case of moving toward the center.

  14 and 15, a long hole 2 f that is long in the horizontal direction is formed in the contact portion 2 b of the holder 2. Further, a jig insertion opening 1 m is formed in the housing 1 so as to face the contact portion 2 b of the holder 2. A cylindrical jig J can be fitted and inserted into the jig insertion opening 1m from the outside. The cylindrical jig J has a pin Jp that is eccentric to the axis at the tip.

  When adjusting the position of the collimating lens 3, the jig J is inserted into the jig insertion opening 1m, and the pin Jp is engaged with the long hole 2f. When the jig J is rotated in this state, the pin Jp presses the side surface of the long hole 2f, and the collimator lens 3 can be displaced together with the holder 2 in the optical axis direction (vertical direction in FIGS. 14 and 15). . At this time, the pin Jp is displaced in the longitudinal direction in the long hole 2f according to the rotation angle of the jig J. After the position adjustment, the holder 2 is bonded to the housing 1. Note that this embodiment can be applied to configurations other than those shown in FIG.

  The present invention has been described above with reference to the embodiments. However, the present invention should not be construed as being limited to the above-described embodiments, and can be modified or improved as appropriate. For example, it is needless to say that a generally used sheet metal member can be used as the holding member in consideration of the terminals and wiring of the light receiving element. The present invention can also be applied to an optical pickup device compatible with optical discs (for example, BD) other than HD DVD.

It is sectional drawing which shows schematically the optical pick-up apparatus concerning this Embodiment. It is sectional drawing which cut | disconnected the structure of FIG. 1 by the surface containing an II-II line, and was seen in the arrow direction. It is the figure which expanded the site | part shown by the arrow III of the optical pick-up apparatus of FIG. It is the figure which looked at the structure of FIG. 3 in the arrow IV direction. It is a perspective view which decomposes | disassembles and shows a holder, a holding member, and a monitor light receiving element. It is a figure which shows the modification of this Embodiment. It is a figure which shows another modification of this Embodiment. It is a figure similar to FIG. 3 which shows 2nd Embodiment. It is a perspective view of the holder used for 2nd Embodiment. It is the figure which looked at the structure of FIG. 8 in the arrow X direction. It is a figure similar to FIG. 2 which shows 3rd Embodiment. It is a figure similar to FIG. 10 which shows 4th Embodiment. It is a figure similar to FIG. 10 which shows 5th Embodiment. It is a figure similar to FIG. 3 which shows 6th Embodiment. It is a principal part perspective view of the structure of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 1a Recessed part 1b Bottom face 1c Support surface 1c 'Support wall 1d Main opening 1e Sub opening 1f Opposing surface 1g Step part 1h Tapered cross-sectional groove 1j Recessed part 1h' Guide convex part 1k Support convex part 1m Insertion jig opening 2, 2 ', 2 ", 2 '" holder 2a holding part 2b contact part 2c through-opening 2d guide convex part 2d' taper cross-sectional groove 2e support convex part 2f long hole 3 collimating lens 4 rising mirror 5 semiconductor laser 6 polarizing beam splitter for blue violet 7 Monitor light receiving element 7a Flexible substrate 9 λ / 4 wavelength plate 10 Objective lens 11 Polarizing beam splitter 12 Servo lens 13 Photo detector 14 Actuator 15 Package 16 CD diffraction grating 20, 20 ′, 20 ″ Holding member 20a Base 20b Plate part 20c Spring portion 20d Arm 20e Rectangular opening 30 Holding member 30c Root J jig Jp pin

Claims (7)

A light source, a rising mirror that reflects light emitted from the light source, a condensing optical system including an objective optical element, a collimating lens disposed between the rising mirror and the objective optical element, and the collimating lens An optical element unit including a holder for holding a light receiving device, and a monitor light receiving element that receives a part of a light beam from the light source, is an optical pickup device attached to a housing,
An optical pickup apparatus, wherein a part of a holding member for attaching the monitor light receiving element to the housing urges the optical element unit toward the housing.   2. The optical pickup device according to claim 1, wherein a part of the light beam emitted from the light source is transmitted through the rising mirror, and the monitor light receiving element receives a part of the transmitted light beam.   The holder includes a holding portion that holds the collimating lens, and a contact portion that contacts the housing and guides the holding portion in a predetermined direction. The monitor light receiving element includes the contact portion and the rising mirror. The optical pickup device according to claim 1, wherein the optical pickup device is disposed between the two.   The holder includes a holding portion that holds the collimating lens, and a contact portion that contacts the housing and guides the holding portion in a predetermined direction. The contact portion includes the monitor light receiving element and the rising mirror. 3. The optical pickup device according to claim 1, further comprising an opening that is disposed between the first and second apertures and transmits a light beam.   The optical pickup device according to claim 1, wherein the holding member is made of a resin having electrical insulation.   The holding member includes a holding portion that holds the monitor light receiving element, and a spring portion that extends from the holding portion and biases the optical element unit, and the spring portions are formed at intervals. The optical pickup device according to claim 1, wherein   The optical pickup device according to claim 1, wherein the monitor light receiving element is attached to a flexible substrate, and the holding member is in close contact so as to reinforce the flexible substrate. .

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