JP2009054216A - Optical pickup device and method of assembling the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact optical pickup device and a method for assembling the same which facilitate adjustment of an optical element. <P>SOLUTION: A fork-shaped support part J1 of a jig J is inserted so as to be guided by a flat part 13c and positioned below a flange part 13b. Then, as shown in Fig. 5, the support part J1 of the jig J is engaged with the lower surface of the flange part 13b, so that a holder 13 is held against the gravity by raising the jig J as it is. Accordingly, a collimator lens 12 and a λ/4 wave plate 11 are raised for each holder 13. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

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

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 Japanese Utility Model Publication No. 05-21323

  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. . Further, optical elements constituting the condensing optical system of the optical pickup device, particularly objective optical elements, are likely to cause spherical aberration due to manufacturing errors, which may cause 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, the correction of spherical aberration in the entire optical pickup device is performed by receiving a light beam actually reflected by the information recording surface of the optical disc with a photodetector through a condensing optical system including an objective optical element, and receiving the signal. However, when adjusting the optical axis direction of the semiconductor laser, the movement in the direction perpendicular to the optical axis is also the movement of the light spot on the photodetector, so that the signal is not stable and adjustment is difficult. There is a problem.

  On the other hand, for example, when the optical pickup device is assembled, the amount of spherical aberration on the information recording surface of the optical disc can be reduced 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 optical element. It can be considered to be within an allowable 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 with the objective optical element and the rising mirror. If it arrange | positions between these, a compact layout is attained, using the collimating lens of a long focal distance. 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.

  Here, there is a problem of how to adjust the position of the collimating lens. On the other hand, Patent Document 2 discloses a technique in which the collimator lens frame is semi-fixed using a presser, and the adjustment jig is rotated to move the lens frame and align the collimator lens in the optical axis direction. It is disclosed. However, according to such a conventional technique, a presser which is essentially used only for adjustment of the collimating lens is mounted on the optical pickup device. Therefore, this technique is applied to the rising mirror and the objective optical element. When applied to an optical pickup device in which a collimating lens is disposed between them, there is a problem that the distance between the rising mirror and the objective optical element becomes long, and the thickness cannot be reduced.

  The present invention has been made in view of such problems, and an object of the present invention is to provide an optical pickup apparatus that can easily adjust an optical element while being compact, and an assembling method thereof.

The optical pickup device according to claim 1 is an optical pickup device including a light source, a rising mirror that reflects light emitted from the light source, and a condensing optical system including an objective optical element,
A housing;
An optical element unit including an optical element disposed between the rising mirror and the objective optical element,
When a holding jig is inserted from the outside toward the optical element unit placed on the housing, it is held by the jig against its own weight by engaging with the jig. The engaging portion is formed in the optical element unit.

  According to the present invention, when a holding jig is inserted from the outside toward the optical element unit placed on the housing, it engages with the jig to resist its own weight. Since the engaging portion that is to be held by the jig is formed in the optical element unit, the optical element unit is held by the jig, for example, when the optical pickup device is assembled. If the optical element can be positioned with respect to the objective optical element, and then the optical element is fixed to the housing, the jig is unnecessary and can be detached from the engaging portion. The optical pickup device can be made compact. Here, the “optical element” includes a collimating lens, a wave plate, a liquid crystal element, a hologram element, a diffraction element, a composite element, and the like.

  According to a second aspect of the present invention, in the optical pickup device according to the first aspect, the optical element unit includes a holder that holds the optical element. However, the optical element unit may be formed of only the optical element.

  According to a third aspect of the present invention, in the invention of the first or second aspect, the relative position between the optical element and the objective optical element is adjusted while the optical element unit is held by the jig. It is characterized by that.

  According to a fourth aspect of the present invention, in the optical pickup device according to any one of the first to third aspects, the housing has a concave portion, and the engaging portion has the optical element unit disposed in the concave portion. In this state, the optical element is positioned above the jig to be inserted in the direction of gravity, so that the optical element can be held against gravity. Accordingly, the engaging portion may have various structures such as a flange portion, a protrusion, a hole, and a groove.

  According to a fifth aspect of the present invention, in the optical pickup device according to any one of the first to third aspects, the optical element unit resists its own weight due to a magnetic force generated between the engaging portion and the jig. Therefore, the optical element can be held against gravity even if the engaging portion is in a position that cannot be seen from the outside.

The optical pickup device assembly method according to claim 6 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. An assembly method of an optical pickup device having an optical element disposed between the elements,
A step of bringing a jig close to an engaging portion formed on an optical element disposed between the raising mirror and the objective optical element, or a holder that holds the optical element;
Performing the relative position adjustment between the optical element and the objective optical element while holding the optical element against the dead weight by engaging the jig with the engaging portion;
Fixing the optical element or the holder to a housing with an adhesive;
Detaching the jig from the engaging portion.

  According to the present invention, by bringing a jig close to an optical element disposed between the raising mirror and the objective optical element, or an engaging portion formed on a holder that holds the optical element, A jig can be engaged with the engaging portion, and thereby the relative position of the optical element and the objective optical element can be adjusted while holding the optical element while resisting its own weight. After that, if the optical element is bonded to the housing directly or via the holder, the jig becomes unnecessary and can be detached from the engaging portion, thereby reducing the size of the optical pickup device. realizable.

  According to the present invention, it is possible to provide an optical pickup device and an assembling method thereof that can easily adjust an optical element while being compact.

  Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings. FIG. 1 is a perspective view of an optical pickup device according to the present embodiment. FIG. 2 is a view of the configuration of FIG. 1 cut along a plane including the II-II line and viewed in the direction of the arrow. 12 is a diagram of the configuration of FIG. 1 cut along a plane including the XII-XII line and viewed in the direction of the arrow. In the figure, the plate-like housing 1 has a hole 1a and a notch 1b inserted through two parallel guide shafts (not shown), and is movable along the guide shaft. 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.

  A housing 2 is fixed on the housing 1. One end of a total of six wires 4 is fixed to the casing 2, three on one side, and the other end of the horizontally extending wire 4 is attached to both side surfaces of the casing-like bobbin 5. ing. The wire 4 has a function of movably supporting the bobbin 5 with respect to the housing 1 and a function of supplying power to the coil from the housing 2 to which a wiring (not shown) is connected. The casing 2 is preferably filled with a gel (not shown) having a damping effect for the wire 4.

  The resin bobbin 5 that is movable with respect to the housing 1 has an objective optical element 6 mounted in a central circular opening (not shown). The objective optical element 6 is used for condensing a laser beam on the information recording surface of an optical disc in an optical pickup device.

  On both sides of the bobbin 5, magnets 9 and 10 lined on yokes 7 and 8 implanted in the housing 1 are arranged. A coil (not shown) is arranged in the bobbin 5 so as to face the magnets 9 and 10. The wire 4, bobbin 5, yokes 7 and 8, and magnets 9 and 10 constitute an actuator.

  In FIG. 2, below the bobbin 5, a λ / 4 wavelength plate 11 that is an optical element and a collimating lens 12 are disposed while being held by a cylindrical holder 13. Here, the λ / 4 wavelength plate 11, the collimating lens 12, and the holder 13 constitute an optical element unit. The holder 13 is fitted into a cylindrical recess 1c formed in the housing 1 and fixed with an adhesive. A cutout 1d (FIG. 1) for filling the adhesive is formed on the upper edge of the recess 1c. Below the collimating lens 12, a rising mirror 14 is arranged, and the light beam from the semiconductor laser 35 or the two-laser 1 package 34 (FIG. 12) arranged in the housing 1 is converted into the collimating lens 12 and the λ / 4 wavelength plate. 11 is made incident on the objective optical element 6.

  3 is an enlarged perspective view of a holder holding a collimating lens and the like, and FIG. 4 is a cross-sectional view of the configuration of FIG. In FIG. 3, for example, a resin (or iron) holder 13 is formed by integrally forming a hollow cylindrical cylindrical portion 13 a and an outer flange portion 13 b extending from the cylindrical portion 13 a in the radial direction. On the outer side surface of the cylindrical portion 13a, a pair of flat portions 13c that are scraped off by two parallel surfaces are formed. The flat portion 13c has a function of guiding when a support portion J1 of the jig J described later is inserted, and a function of determining the phase around the optical axis of the λ / 4 wavelength plate 11 via the holder 13. The upper notch 13e of the holder 13 has a function of securing the positioning of the λ / 4 wavelength plate 11 and the holder 13 in the rotational direction by engaging with the corner of the mounted λ / 4 wavelength plate 11. The position of the flange portion 13b is preferably above the yokes 7 and 8 of the actuator. A relief for avoiding interference with the holder may be provided in the yokes 7 and 8 of the actuator.

  As shown in FIG. 4, an inner flange portion 13d is formed at the center in the axial direction in the cylindrical portion 13a, and the λ / 4 wavelength plate 11 is attached to the cylindrical portion 13a so as to be in contact with the upper surface side. Yes. On the other hand, the collimating lens 12 is attached so that the flange abuts from the lower surface side of the inner flange portion 13d.

  Next, the operation of the optical pickup device according to this embodiment will be described. 2 and 12, when information is reproduced from the HD DVD, when the first semiconductor laser 35 as a light source is caused to emit light, a laser beam having a wavelength of about 405 nm emitted from the first semiconductor laser 35 is emitted by the blue-violet polarizing beam splitter 36. The light is reflected and further reflected by the rising mirror 14, but part of the light passes through the rising mirror 14 and is detected by the power monitor 15. The light beam reflected by the rising mirror 14 passes through the collimating lens 12 and the λ / 4 wavelength plate 11 and is condensed on the information recording surface of the HD DVD via the objective optical element 6.

  The light beam reflected from the information recording surface of the HD DVD passes through the objective optical element 6, the λ / 4 wavelength plate 11, and the collimator lens 12, and is reflected by the rising mirror 14, and the blue-violet polarizing beam splitter 36, the polarizing beam splitter. Since the signal passes through 31 and enters the photodetector 33 through the servo lens 32, 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 33 are detected, and focus detection and track detection are performed. Based on the detection, the objective optical element 6 can be integrated with the bobbin 5 and driven by the actuator so that the light beam from the first semiconductor laser 35 forms an image on the information recording surface of the HD DVD. It has become.

  When reproducing information from a DVD, when the second semiconductor laser in the two-laser one package 34 is caused to emit light, a laser beam having a wavelength of around 660 nm emitted from the two lasers passes through the CD diffraction grating 37 and is polarized beam splitter. Reflected by 31, passes through the blue-violet polarizing beam splitter 36, and further reflected by the rising mirror 14, but part of it passes through the rising mirror 14 and is detected by the power monitor 15. The light beam reflected by the rising mirror 14 passes through the collimator lens 12 and the λ / 4 wavelength plate 11 and is condensed on the information recording surface of the DVD via the objective optical element 6.

  The light beam reflected from the information recording surface of the DVD passes through the objective optical element 6, the λ / 4 wavelength plate 11 and the collimator lens 12, is reflected by the rising mirror 14, and is polarized with blue-violet polarizing beam splitter 36 and polarizing beam splitter 31. , And enters the photodetector 33 via the servo lens 32, so that 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 33 are detected, and focus detection and track detection are performed. Based on this detection, the objective optical element 6 can be integrated with the bobbin 5 and driven by the actuator so as to focus the light beam from the second semiconductor laser on the information recording surface of the DVD. Yes.

  When information is reproduced from a CD, when the third semiconductor laser in the two-laser one package 34 is caused to emit light, a laser beam having a wavelength of about 785 nm emitted from the second laser enters the CD diffraction grating 37 and a tracking signal. ± 1st order diffracted light is generated. The laser beam is reflected by the polarizing beam splitter 31, passes through the blue-violet polarizing beam splitter 36, and further reflected by the rising mirror 14, but part of the laser beam passes through the rising mirror 14 and is reflected by the power monitor 15. Detected. The light beam reflected by the rising mirror 14 passes through the collimating lens 12 and the λ / 4 wavelength plate 11 and is condensed on the information recording surface of the CD via the objective optical element 6.

  The light beam reflected from the information recording surface of the CD passes through the objective optical element 6, the λ / 4 wavelength plate 11 and the collimator lens 12, is reflected by the rising mirror 14, and is converted into a blue-violet polarizing beam splitter 36 and a polarizing beam splitter 31. , And enters the photodetector 33 via the servo lens 32, so that 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 33 are detected, and focus detection and track detection are performed. Based on this detection, the objective optical element 6 can be integrated with the bobbin 5 and driven by the actuator so as to focus the light beam from the third semiconductor laser on the information recording surface of the CD. Yes.

  Next, adjustment during assembly in the optical pickup device according to the present embodiment will be described. First, the holder 13 to which the λ / 4 wavelength plate 11 and the collimating lens 12 are attached is fitted into the concave portion 1 c of the housing 1. Since the recess 1 c is positioned with high accuracy with the semiconductor laser 15, the center of the light beam emitted from the semiconductor laser 15 coincides with the optical axis of the collimating lens 12 by the fitting of the holder 13. With the holder 13 bottomed on the bottom surface of the recess 1 c, the flange portion 13 b is visible from the outside and is disposed with a gap with respect to the top surface of the housing 1.

  Here, as shown in FIG. 1, the bifurcated fork-shaped support portion J1 of the jig J is inserted so as to be positioned below the flange portion 13b while being guided by the flat portion 13c. Then, as shown in FIG. 5, since the support portion J1 of the jig J is engaged with the lower surface of the flange portion 13b, the holder J is held against the gravity by raising the jig J as it is. However, the collimating lens 12 and the λ / 4 wavelength plate 11 for each holder 13 can be raised. Further, the tilt position of the objective optical element 6 is first adjusted with the holder 13 in a floating state. Subsequently, the distance between the objective optical element 6 and the collimating lens 12 is determined while the semiconductor laser 15 emits light and the light beam passing through the objective optical element 6 is measured by a measuring instrument (not shown) placed at the position of the optical disk. Try to keep it apart. Thereafter, an adhesive is filled from the outside through a notch 1 d (FIG. 1) formed in the recess 1 c, and the holder 13 is fixed to the housing 1. After fixing, the jig J is retracted from the holder 13.

  FIG. 6 is a perspective view of a holder according to a modification of the present embodiment. The holder 13 ′ according to the present modification has a pair of grooves 13 c ′ that can be engaged with the support portion J <b> 1 of the jig J on the side surface of the cylindrical portion 13 a instead of providing the flange portion. The groove 13c 'constitutes an engaging portion. About another structure, it is the same as that of embodiment mentioned above.

  FIG. 7 is a perspective view of a collimating lens according to a modification of the present embodiment. FIG. 8 is a diagram showing a collimating lens according to a modification, cut in the optical axis direction. The resin-made collimating lens 12 'includes a lens portion 12a and a hollow cylindrical portion 12b formed around the lens portion 12a. On the outer side surface of the hollow cylindrical portion 12b, a pair of flat portions 12c that are scraped off by two parallel surfaces are formed. The upper part of the flat part 12c becomes the protruding collar part 12d. In this modification, the optical element unit is configured only by the collimating lens 12 ', and thus the flange portion 12d forms the engaging portion.

  In this modification, the collimating lens 12 ′ is directly fitted into the recess 1 c of the housing 1. With the collimating lens 12 ′ bottomed on the bottom surface of the recess 1 c, the flange 12 d is visible from the outside and is disposed with a gap with respect to the top surface of the housing 1. Although not shown, the λ / 4 wavelength plate is fixed to the housing 1 between the collimating lens 12 and the objective optical element 6.

  Similarly to the above-described embodiment, the bifurcated fork-shaped support portion J1 of the jig J is inserted so as to be positioned below the flange portion 12d while being guided by the flat portion 12c. Thereby, since the support part J1 of the jig | tool J comes to engage with the lower surface of the collar part 12d, the collimating lens 12 can be raised against gravity by raising the jig | tool J as it is, Similarly, the position can be adjusted.

  FIG. 9 is a perspective view of a holder according to another embodiment. In the present embodiment, the holder 23 has a hollow cylindrical portion 23a made of resin and two engaging portions 23b made of iron which is an example of a magnetic body. More specifically, on the outer side surface of the hollow cylindrical portion 23a having a notch at the end, a pair of flat portions 23c that are scraped off by two parallel surfaces are formed, and in a recess 23d formed therebelow. A prismatic engaging portion 23b is attached.

  In the present embodiment, the shape of the jig J is the same as that shown in FIG. 1, but the support portion J1 is an electromagnet. Accordingly, when the bifurcated fork-shaped support portion J1 of the jig J is inserted so as to be positioned above the engagement portion 23b while being guided by the flat portion 23c, and the electromagnet is turned on, the engagement portion is connected to the support portion J1. Since 23b is attracted by the magnetic force, the holder J can be held against the gravity by raising the jig J as it is, and the collimating lens 12 and the λ / 4 wavelength plate 11 for each holder 13 can be raised. In the present embodiment, there is no problem because the magnetic force is used to attract even if the engaging portion 23b is depressed and cannot be directly seen from the outside with the holder 23 set in the recess 1c.

  FIG. 10 is a perspective view of a holder according to a modified example. The holder 23 ′ according to the present modification is entirely made of a magnetic material instead of providing an iron engaging portion which is an example of a magnetic material. In this modified example, the flat portion 23c is formed as in the above-described embodiment, and the forked support portion J1 of the jig J is engaged with the flat portion 23c. When there is an adjustable space between the optical element 23 ′ and the objective optical element 6, a plate-shaped jig with an electromagnet provided with an opening through which light passes is inserted above the holder 23 ′. 'May be held by suction.

  FIG. 11 is a perspective view of a collimating lens according to a modification of the present embodiment. In the present embodiment, the collimating lens 22 has a shape similar to that shown in FIG. 7, but an iron engaging portion, which is an example of a magnetic body, is formed on a flat portion 22 c formed below the flange portion 22 d. The difference is that 22e is fixed. When the bifurcated fork-shaped support portion J1 of the jig J is inserted so as to abut on the collimating lens 22 or against the engagement portion 22e, and the electromagnet is turned on, the engagement portion 22e is attracted to the support portion J1 by magnetic force. Therefore, by raising the jig J as it is, the collimating lens 22 can be raised against gravity. In the case of this modification, the jig J does not necessarily have the bifurcated fork-shaped support portion J1, and may be a plate having an opening.

  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, the outer diameter of the holder 13 can be made smaller than the inner diameter of the recess 1 c of the housing 1, and the holder 13 can be positioned in the direction orthogonal to the optical axis using the jig J.

It is a perspective view of the optical pick-up apparatus concerning this Embodiment. It is the figure which cut | disconnected the structure of FIG. It is an expansion perspective view of the holder holding the collimating lens etc. concerning this Embodiment. It is sectional drawing of the structure of FIG. It is a perspective view which shows the state holding the collimating lens with the jig | tool. It is a perspective view of the holder concerning the modification of this Embodiment. It is a perspective view of the collimating lens concerning the modification of this Embodiment. It is a figure which cuts and shows the collimating lens concerning a modification in an optical axis direction. It is a perspective view of the holder concerning another embodiment. It is a perspective view of the holder concerning a modification. It is a perspective view of the collimating lens concerning the modification of this Embodiment. It is the figure which cut | disconnected the structure of FIG. 1 by the surface containing a XII-XII line | wire, and looked at the arrow direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 1a Hole 1b Notch 1c Recessed part 1d Notch 2 Case 4 Wire 5 Bobbin 6 Objective optical element 7, 8 Yoke 9, 10 Magnet 11 λ / 4 wavelength plate 12, 12 'Collimating lens 12a Lens part 12b Hollow cylindrical part 12c Flat Part 12d collar part 13, 13 'holder 13a cylindrical part 13b flange part 13b outer flange part 13c flat part 13c groove 13d inner flange part 14 mirror 15 semiconductor laser 22 collimating lens 22d collar part 22e engaging part 23 holder 23a hollow cylindrical part 23b Engaging portion 23c Flat portion 23d Recessed portion 31 Polarizing beam splitter 32 Servo lens 33 Photo detector 34 2 Laser 1 package 35 Semiconductor laser 36 Polarizing beam splitter for blue violet 37 CD diffraction grating J Jig J1 Supporting portion

Claims (6)

An optical pickup device comprising a light source, a rising mirror for reflecting light emitted from the light source, and a condensing optical system including an objective optical element,
A housing;
An optical element unit including an optical element disposed between the rising mirror and the objective optical element,
When a holding jig is inserted from the outside toward the optical element unit placed on the housing, it is held by the jig against its own weight by engaging with the jig. An optical pickup device characterized in that an engaging portion adapted to be formed in the optical element unit.   The optical pickup device according to claim 1, wherein the optical element unit includes a holder that holds the optical element.   The optical pickup device according to claim 1, wherein the relative position adjustment between the optical element and the objective optical element is performed while holding the optical element unit with the jig.   The said housing has a recessed part, The said engaging part is located in the gravity direction upper direction with respect to the said jig | tool inserted in the state in which the said optical element unit was arrange | positioned in the said recessed part. Item 4. The optical pickup device according to any one of Items 1 to 3.   The light according to claim 1, wherein the optical element unit is held by the jig against its own weight by a magnetic force generated between the engagement portion and the jig. Pickup device. Light having a light source, a rising mirror for reflecting light emitted from the light source, a condensing optical system including an objective optical element, and an optical element disposed between the rising mirror and the objective optical element A method for assembling a pickup device,
A step of bringing a jig close to an engaging portion formed on an optical element disposed between the raising mirror and the objective optical element, or a holder that holds the optical element;
Performing the relative position adjustment between the optical element and the objective optical element while holding the optical element against the dead weight by engaging the jig with the engaging portion;
Fixing the optical element or the holder to a housing with an adhesive;
And a step of detaching the jig from the engaging portion.

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