WO2005093730A1

WO2005093730A1 - Optical pickup, method of producing the pickup, and holding device

Info

Publication number: WO2005093730A1
Application number: PCT/JP2005/005329
Authority: WO
Inventors: Masaya Murata; Hirokatsu Nagatake
Original assignee: Pioneer Corporation
Priority date: 2004-03-25
Filing date: 2005-03-24
Publication date: 2005-10-06
Also published as: JPWO2005093730A1

Abstract

An optical pickup in which a cylindrical lens is appropriately provided by a holding device. A cylindrical lens (345) is fitted and held such that its one end peripheral edge in the axial direction is in contact with a contact surface between a pair of holding sections constructing substantially hollow-cylinder-like inner peripheral surfaces of a lens base. A chuck mechanism of a supporting device is engaged and held in V-groove sections in the outer surfaces of the holding sections. The lens base is positionally adjusted by the supporting device in an optical axis direction (Z) of the cylindrical lens (345), in two radial directions (X, Y) orthogonal to each other, and in a rotational direction (R), and an installation section of the lens base is adhered and fixed to a base. A light receiving element (350) does not require positional adjustment and an optical pickup (300) is easily reduced in size.

Description

Specification

Optical pickup, method of manufacturing the same, and holding device

Technical field

The present invention relates to an optical pickup having an optical element, a method for manufacturing the same, and a holding device.

Background art

Conventionally, as an information processing apparatus that reads information recorded on a recording surface and records various information on the recording surface, a disk device that processes a disk-shaped recording medium such as an optical disk by an optical pickup is known. I have. The optical pickup of this disk device is configured by combining various optical elements with high precision in order to appropriately process information. Various configurations for assembling the optical pickup well are known (for example, see Patent Document 1 or Patent Document 2).

[0003] The one described in Patent Document 1 uses a substantially cylindrical single lens optical element having a convex lens surface and a concave cylindrical lens surface. A fitting portion provided on the optical element at a position inclined by 45 ° with respect to the cylindrical axis and a substantially convex portion of the holding member are fitted and connected. The reference surface of the holding member is fixed to the reference surface of the optical housing, the direction of the astigmatism generated by the optical element and the optical axis direction are determined, and the positioning of the astigmatism direction and the optical axis direction is exclusively adjusted. A configuration is adopted in which the adjustment step can be performed without the need for an adjustment step.

[0004] Patent Document 2 discloses an optical pickup in which a concave lens that is easier to downsize than a light receiving element is mounted on a concave lens base, and a groove orthogonal to the y direction, which is the thickness direction of the pickup, is formed in the concave lens base. Provide. Using the eccentric cam with the base groove as a fulcrum, adjust in the y direction along the y direction reference plane of the housing. The light-receiving element is adjusted while securing sufficient adjustment space only in the X direction, and an ultra-thin pickup is configured without the need for adjustment in the thickness direction of the light-receiving element pickup. In addition, the collimator lens and the polarizing beam splitter are integrated, and by rotating the collimator lens with respect to the outer diameter, the reflection angle of the light beam is shifted in the y-axis direction, and the position of the received light spot is adjusted in the y-direction. An ultra-thin pickup is constructed without the need for adjustment in the thickness direction of the light-receiving element pickup. Patent Document 1: Japanese Patent Application Laid-Open No. 10-3683 (page 4, left column, page 5 left column, FIG. 1) Patent Document 2: Japanese Patent Application Laid-Open No. 10-143897 (page 2, right column-page 3) Right column, Figures 4 and 7) Disclosure of the invention

Problems to be solved by the invention

[0006] While applying force, the one described in Patent Document 1 has a specially shaped optical element having a convex lens surface and a concave cylindrical surface, and provided with a fitting portion at a predetermined position for coupling to a holding member. For example, it is difficult to form an optical element and the yield may be degraded due to the use of the optical element. Furthermore, a structure for fitting the optical element and the holding member needs to be formed with high precision, and there is a possibility that productivity may not be improved and cost may not be reduced. Further, in the case of Patent Document 2, the position of both the concave lens or the collimator lens and the light receiving element needs to be adjusted, which makes the production complicated.

An object of the present invention is to provide a holding device for appropriately disposing an optical element, an optical pickup, and a method of manufacturing the same in view of the above-described circumstances and the like.

Means for solving the problem

[0008] The present invention provides a housing, a light source provided in the housing for emitting outgoing light for irradiating an object to be irradiated, and receiving at least a part of the outgoing light reflected by the object to be irradiated. A light receiving means for outputting a predetermined signal, a cylindrical lens having at least one flat surface at the periphery, and irradiating the light receiving means with at least a part of the outgoing light reflected from the irradiation object; An optical pickup comprising: a fixing member that fixes the cylindrical lens, the position of which has been adjusted in four directions of two radial directions and a rotation direction orthogonal to each other in an axial direction, to the housing.

The present invention is a method for manufacturing an optical pickup including a light source and a cylindrical lens that condenses at least a part of light emitted from the light source and reflected on an object to be irradiated on a light receiving unit. An optical axis direction of the cylindrical lens in a state where the cylindrical lens is at least positioned between two positions of the cylindrical lens that condenses the emitted light in a substantially linear shape due to astigmatism at the position of the light receiving unit; A method for manufacturing an optical pickup, comprising: adjusting a position in two orthogonal directions, a radial direction and a circumferential direction, and positioning and fixing the cylindrical lens in the adjusted state. [0010] The present invention is a holding device for forming an optical pickup by disposing a cylindrical lens having at least one plane on the periphery in a housing, and having an opening facing at least one plane of the periphery of the cylindrical lens. A holding portion for holding a peripheral edge of the cylindrical lens in a direction intersecting with the optical axis direction, and a contact surface provided on the holding portion with which a peripheral edge of one end of the cylindrical lens in the optical axis direction abuts. An abutting portion, an engaging recess provided on an outer surface of the holding portion and held by the supporting device so as to be releasably engaged, And a mounting portion having a mounting surface to be mounted on the holding device.

According to the present invention, there is provided a holding device for arranging the cylindrical lens in the optical pickup of the present invention described above in the housing or for positioning and fixing the cylindrical lens in the method for manufacturing an optical pickup according to claim 5. A holding portion for holding the peripheral edge of the cylindrical lens in a direction intersecting the optical axis direction, the holding portion having an opening facing at least one plane of the peripheral edge of the cylindrical lens; An abutting portion having an abutting surface with which one peripheral edge of the cylindrical lens in the optical axis direction abuts; and an engaging recess provided on an outer surface of the holding portion and held by the supporting device being detachably engaged and held. And a mounting portion provided on one end side of the holding portion in the axial direction and having a mounting surface mounted on a mounting portion at a tip thereof. That.

Brief Description of Drawings

FIG. 1 is a configuration diagram showing an optical schematic configuration which is an optical path configuration of an optical pickup according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining an arrangement state of a cylindrical lens of the optical pickup according to the embodiment.

FIG. 3 is a partially cutaway perspective view showing the vicinity of a cylindrical lens in the optical pickup according to the embodiment.

FIG. 4 is an explanatory view for explaining a state of astigmatism caused by the cylindrical lens in the embodiment, (A) is a side view showing a state of condensing outgoing light, and (B) is a side view showing condensing of outgoing light. It is sectional drawing which shows a situation.

FIG. 5 is a side view showing a lens base in the embodiment. FIG. 6 is a front view showing a lens base in the embodiment.

FIG. 7 is a rear view showing the lens base in the embodiment.

FIG. 8 is a cross-sectional view showing a lens base according to the embodiment.

Explanation of symbols

[0013] 10 Optical discs as objects to be irradiated

300 …… Optical pickup

310 …… Base as housing

320 ... Semiconductor laser as light source

345 …… Cylindrical lens

350 ... Light receiving element as light receiving means

360 · · · · · Lens base as a holding device that constitutes the fixing member

361 …… Abutment

361B… Abutment surface

362 …… Holding part

362B ... Opening

363 …… V-groove as engagement recess

364 …… Mounting part

364A ... Leg 咅

364Β Mounting surface

370 …… Objective lens

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, force information may be read out or recorded only as described by way of example of an optical pickup for a disk drive, which records and reads information on an optical disk which is a removable disk-shaped recording medium as a recording medium. Further, the disk-shaped recording medium is not limited to an optical disk, but may be a disk-shaped recording medium such as a magnetic disk or a magneto-optical disk. Further, any recording medium, such as a cylindrical recording medium having a recording surface on the outer peripheral surface or a recording medium integrally provided, can be used. Also disk The present invention is not limited to the apparatus, but may be any optical apparatus such as a camera or a microscope that irradiates an object to be irradiated with light having a light source power.

[Configuration of Optical Pickup]

As the optical pickup in the present embodiment, a power that exemplifies a configuration capable of processing information on a DVD (Digital Versatile Disc) as an optical disc, for example, a CD (Compact Disc), As described above, a configuration according to the information processing of any of the recording media can be applied. As a light source, for example, a configuration in which a laser beam for DVD is emitted as emission light is exemplified. However, a configuration in which laser light for CD is emitted, and further, emission light of two frequencies of laser light for CD and laser light for DVD is used. A configuration using a light source that can emit light, a configuration that can emit light with a plurality of wavelengths, and the like can be used.

As shown in FIG. 1 and FIG. 2, an optical pickup 300 in a disk device called a so-called slim disk drive mounted on an electric device such as a portable personal computer is partially shown in FIG. And a base 310 as a housing as shown in FIG. The base 310 is provided with a light source holder, a pedestal, a mounting wall, and the like (not shown). In the light source holding portion of the base 310, a semiconductor laser 320 as a light source for emitting a laser beam for DVD as emission light that is light of a wavelength for DVD is provided.

On the emission side of the semiconductor laser 320, a DVD grating 331 provided on the pedestal is provided. The DVD grating 331 is integrally mounted on a mounting base (not shown) and mounted on a pedestal by a mounting member.

Further, the base 310 is provided with a semi-transmissive mirror 341 located on the optical axis of the semiconductor laser 320. The semi-transmissive mirror 341 reflects the DVD laser light and transmits the DVD laser light incident thereon in the reflection direction. Further, the base 310 is provided with a mirror 342 that reflects the DVD laser light reflected by the transflective mirror 341. The base 310 is provided with a collimator lens 343 for adjusting the diameter and the spread angle of the DVD laser light reflected by the mirror 342. Next to the collimator lens 343, there are disposed a wave plate 344 through which the laser light for DVD whose diameter and divergence angle has been adjusted is transmitted, and a liquid crystal panel for reducing the wavefront aberration as shown in FIG. You. As shown in FIGS. 1 to 3, the base 310 has a light receiving element as a light receiving means for receiving the DVD laser light transmitted through the semi-transmissive mirror 341 and outputting a predetermined signal. 350 are arranged. Further, a cylindrical lens 345 is provided between the transflective mirror 341 and the light receiving element 350. As shown in FIG. 4, the cylindrical lens 345 has two positions A and B that collect the DVD laser light in a substantially linear manner due to astigmatism at the position of the light receiving surface of the light receiving element 350. There is a positional relationship C where light is collected in a substantially circular shape between the linear light collection positions. Note that the cylindrical lens 345 has a pair of flat portions (not shown) that are substantially opposed to each other in the radial direction at the peripheral edge. Then, this cylindrical lens 345 is positioned and fixed to the base 310 by a lens base 360 as a holding device constituting a fixing member shown in FIGS.

The lens base 360 on which the cylindrical lens 345 is provided is formed of, for example, a synthetic resin and has a rectangular contact portion 361. A substantially flat circular through-hole 361A is provided substantially at the center of the contact portion 361, and one surface side is a contact surface 361B to which one peripheral edge of the cylindrical lens 345 in the optical axis direction contacts.

[0021] At both ends in the longitudinal direction of the contact portion 361, a pair of holding portions 362 that protrude in the same direction toward the contact surface 361B side are provided. The holding portions 362 are each provided with a holding concave portion 362A having a substantially curved concave shape on the opposing surface. With these opposed holding concave portions 362A, the holding portion 362 forms a cylindrical inner peripheral surface having substantially the same diameter as the diameter of the cylindrical lens 345. An opening 362B is formed between both sides of the pair of holding portions 362 so as to face a part of the peripheral surface of the cylindrical lens 345 held by the holding portion 362, that is, a plane portion.

[0022] The outer surface of the holding portion 362 has a V-shaped engagement recess formed as a groove in the direction opposite to the opening surface of the opening 362B and expanding outward in the direction opposite to the holding portion 362. A V-shaped groove 363 is provided. The V-groove 363 is not shown, and the chuck mechanism is removably engaged by a support device having a chuck mechanism, so that the lens base 360 can be supported by the support device.

[0023] At both ends in the longitudinal direction of the contact portion 361, there are provided mounting portions 364 formed of a pair of leg portions 364A that protrude in series on the side opposite to the side where the holding portion 362 protrudes. I have. The mounting portion 364 is formed such that a pair of leg portions 364A protrude in the opposite direction to the facing direction. The distal end of the leg 364A is further bent in a direction opposite to the facing direction, and mounting surfaces 364B are provided on the outer surface side of the mounting wall with an adhesive 312 or the like. These mounting surfaces 364B form a plane with the mounting surfaces 364B.

The cylindrical lens 345 is fitted between the holding portions 362 of the lens base 360 until one peripheral edge in the optical axis direction abuts on the contact surface 361B, and is orthogonal to the optical axis direction of the cylindrical lens 345. It is held in a state of being held in the radial direction, that is, a state in which the optical axis direction of the cylindrical lens 345 is substantially coaxial with the center axis of the through hole 361A. As shown in FIG. 2, the lens base 360 holding the cylindrical lens 345 is appropriately adjusted in the optical axis direction Z, the orthogonal radial directions X and Y of the cylindrical lens 345, and the rotational direction R which is the circumferential direction. As shown in FIG. 12, the position is adjusted, and the mounting portion 364 attaches and fixes the base 310 to the base 310 with an adhesive 312 or the like.

[0025] The optical pickup 300 includes an objective lens 370 held by an objective lens base (not shown). The objective lens 370 is disposed so as to be movable in a direction along the optical axis of the DVD laser light reflected by the mirror 342 and in a radial direction which is a tracking direction orthogonal to the optical axis. The objective lens 370 is moved by a moving means provided with a magnetic material, a magnet, a coil, and the like (not shown) attached to the base 310 and the objective lens base. Then, in a normal state where the objective lens 370 is not moved, the light is condensed on the light receiving surface of the light receiving element 350 by the cylindrical lens 345 in a substantially circular relationship, and the light is condensed linearly in two directions on the light receiving surface. As shown in FIG. 2, the state is adjusted appropriately so as to detect the state in which the lens is moved, and a cylindrical lens 345 is attached and fixed to a base 310 by a lens base 360.

[0026] In addition, the optical pickup 300 receives a part of the laser light for DVD, detects the amount of received light, and adjusts the output of the semiconductor laser 320. An optical element such as a collimator lens 346 for condensing light on the light receiving element 350 and various mirrors are also provided.

[Assembly operation of optical pickup] Next, the assembling operation of the optical pickup 300 will be described.

Electric components such as a semiconductor laser 320 ゃ light receiving element 350 and a light receiving element for front monitoring are arranged on a base 310 formed in a predetermined shape. Further, a mounting base to which the DVD grating 331 is mounted is mounted by a mounting member, and various optical elements such as a semi-transmissive mirror 341, a mirror 342, a collimator lens 343 and a wave plate 344 are provided. After that, the moving means is arranged together with the objective lens base on which the objective lens 370 is mounted.

[0029] Further, the lens base 360 on which the cylindrical lens 345 is mounted is supported by a supporting device and disposed at a predetermined position. While supported by this support device, the support device recognizes one plane of the cylindrical lens 345 facing the opening 362B, and recognizes the attitude of the cylindrical lens 345. When the lens base 360 is arranged, the DVD laser light received on the light receiving surface of the light receiving element 350 is converged into a substantially circular shape as shown in FIG. The 360 is moved in the optical axis direction Z and the radial directions X and Y. Further, the position of light condensed substantially linearly due to astigmatism is rotated in the rotation direction R so that the light receiving element 350 can detect it, and the position is adjusted. Then, with the position adjusted, the mounting surface 364B of the mounting portion 364 is bonded and fixed to the mounting wall of the base 310 with an adhesive 312 or the like, and the cylindrical lens 345 is disposed on the base 310 with the lens base 360.

Then, the mounting base mounted by the mounting member is rotated in the circumferential direction, the diffraction state of the passing DVD laser light is appropriately set, and the optical pickup 300 is assembled and formed.

[Function and Effect in Optical Pickup]

As described above, in the above-described embodiment, the cylindrical lens 345 that converges the DVD laser light emitted from the semiconductor laser 320 into a substantially linear shape due to astigmatism at the position of the light receiving surface of the light receiving element 350. With the cylindrical lens 345 positioned between the positional relationships A and B, the position is adjusted and fixed in the optical axis direction Z, the two orthogonal radial directions X and Y, and the rotational direction R. For this reason, the cylindrical lens 345, which is easier to miniaturize than the photodetector 350, is moved in four directions to adjust the position so as to obtain an appropriate focusing state. The optical pickup 300 can be miniaturized to a size that allows the light receiving element 350 to be disposed, which does not need to be performed. Therefore, for example, a portable par A disk device used in a sonal computer or the like can be easily made thinner.

Further, the position is adjusted in four directions, that is, the position is also adjusted in the rotation direction R. Therefore, the leakage noise of the servo signal due to the deviation of the astigmatism in the rotation direction of the lens can be reduced, and the adjustment can be performed with high accuracy.

Further, after arranging each electric component and each optical element, the position of the cylindrical lens 345 is adjusted. For this reason, the final position adjustment is performed at one position of the cylindrical lens 345, so that high-precision adjustment can be performed, and the reliability of relative position shift of components can be improved.

Further, the cylindrical lens 345 is mounted on the lens base 360, and the position is adjusted by the support device. Therefore, the position of the cylindrical lens 345 with respect to the base 310 is adjusted in the air, and the position can be easily adjusted in four directions, and high-precision adjustment can be easily performed. Further, since the position is adjusted in the air, for example, it is possible to obtain a simplified configuration in which it is not necessary to provide a sliding surface for sliding and guiding the position of the cylindrical lens 345 on the base 310, for example. In addition, stable position adjustment that eliminates vibration and hooking force during sliding movement can be performed. Furthermore, since the position is adjusted in the air, the main surface of the cylindrical lens 345 can also be adjusted in a direction inclining with respect to the wavefront of the DVD laser light transmitted therethrough. For example, the wavefront aberration can be reduced. High-precision adjustment is possible. In addition, because the position is adjusted in the air, there is some tolerance in the configuration that fits and holds the lens base 360 and the configuration that attaches the lens base 360 to the base 310. In addition, the dimensional tolerances of the cylindrical lens 345 and the lens base 360 can be increased, and the cost can be easily reduced by improving the manufacturability and the yield.

The arrangement of the cylindrical lens 345 uses a lens base 360 shown in FIGS. 5 to 8. That is, the cylindrical lens 345 has an opening 362B that faces at least one surface of the peripheral edge of the cylindrical lens 345 at the contact portion 361 having the contact surface 361B with which the peripheral edge of one end in the optical axis direction of the cylindrical lens 345 contacts. A pair of holding portions 362 for holding the peripheral edges in a radial direction orthogonal to the optical axis direction are provided, and a mounting portion 364 having a mounting surface 364B mounted on the base 310 is provided on the side opposite to the holding portion 362. And In addition, a V-groove portion 363 is provided on the outer surface of the holding portion 362 so that the supporting device is detachably engaged and held. For this reason, the width dimension, which is the direction in which the opening 362B of the lens base 360 is provided, can be set to a minimum, and this direction is set to, for example, the radial direction Y, which is a dimension restriction of the optical pickup 300 for thinness. Therefore, the optical pickup 300 can be easily miniaturized.

[0036] The holding portion 362 is configured as a pair of members so as to sandwich the cylindrical lens 345 in the radial direction. For this reason, a pair of openings 362B is formed in a direction orthogonal to the direction in which the pair of holding parts 362 are opposed to each other, and the width in this direction can be easily reduced, and the size can be easily reduced with a simple structure. In addition, by making one plane of the cylindrical lens 345 face through the opening 362B, it is possible to further reduce the width in this direction, and it is also possible to easily position the cylindrical lens 345 in this direction, as well as a positioning part that comes into contact with the supporting device in one plane. With this arrangement, the posture of the cylindrical lens 345 in a state of being easily supported can be easily recognized, and the position can be easily adjusted.

Further, a holding concave portion 362 A having a curved concave shape for fitting and holding the cylindrical lens 345 on the opposing surfaces of the pair of holding portions 362 is formed to form a substantially cylindrical inner peripheral surface. ing. Therefore, the cylindrical lens 345 can be stably held with a simple structure without increasing the width.

Further, as a contact portion 361 having a contact surface 361B with which one peripheral edge in the axial direction of the cylindrical lens 345 is in contact, a through hole 361A is provided substantially at the center, which is an inner peripheral surface of the holding portion 362. It is provided so as to protrude from the surface. For this reason, it is possible to easily obtain a configuration capable of positioning and holding the cylindrical lens 345 without increasing the width thereof without disturbing the light focusing state of the cylindrical lens 345.

[0039] Further, a pair of legs 364A having a mounting surface 364B attached to the base 310 at the distal end thereof on a side opposite to the holding portion 362 with respect to the contacting portion 361, a direction substantially parallel to the opening surface of the opening 362B. , That is, in a state of being opposed to the holding portion 362 in the facing direction. For this reason, a configuration for attaching to the base 310 can be easily obtained without increasing the width and the size.

[0040] The ends of the legs 364A are provided so as to protrude in opposite directions. For this reason, the interval of attachment to the base 310 is widened, and for example, displacement due to a change in the adhesive at the time of bonding with the adhesive is less likely to occur. It is easy to install with a simple configuration. Further, the distal end of the leg 364A is provided in a state of being bent in a direction opposite to the facing direction, and a mounting surface 364B is provided on the outer surface side. For this reason, the mounting area can be easily enlarged with a simple structure without increasing the size in the width direction, sufficient adhesive strength can be obtained, and reliable positioning and fixing can be performed.

[0041] The mounting surface 364B of the leg 364A is formed substantially parallel to the contact surface 361B, and the pair of mounting surfaces 364B is formed on a plane. Thus, the posture of the cylindrical lens 345 in the mounted state can be easily recognized with a simple configuration.

[0042] Further, the leg 364A is gradually narrowed toward the tip. Therefore, when the position is adjusted in the rotation direction R, the tip of the leg portion 364A can be prevented from protruding in the radial direction Y, and the size can be reliably reduced with a simple configuration.

The V-groove 363 engaged with and held by the supporting device is formed in a V-shape that is formed in a groove shape in the width direction and expands outward in the direction opposite to the holding portion 362. Therefore, the lens base 360 can be reliably positioned and supported with a simple configuration while being supported by the support device, and the position can be reliably adjusted.

[Modification of Embodiment]

The present invention is not limited to the above-described embodiments, but includes the following modifications as long as the object of the present invention can be achieved.

That is, the force exemplified for the optical pickup 300 used in the disk device that performs the information processing on the optical disk 10 As described above, the information is processed not only in the disk device but also in any recording medium. The present invention is not limited to an optical pickup and a device for performing information processing, but can be applied to any optical device such as a camera or a telescope that irradiates an object to be irradiated with light emitted from a light source.

Although the DVD semiconductor laser 320 that emits a DVD laser beam has been described as a light source, the CD semiconductor laser that emits a CD laser beam may be used as described above. One laser that emits light of two wavelengths, one that emits light of two wavelengths, laser light for CD and laser light for DVD, is not limited to light of two wavelengths, and is not limited to light of two wavelengths. Or a semiconductor laser capable of emitting the above light. Further, not only the semiconductor laser but also any other light source can be used. [0047] In the description, the cylindrical lens 345 is held on the lens base 360 and positioned and fixed to the base 310. However, the position is adjusted by the support device without using the lens base 360 and directly bonded and fixed to the base 310. You may do it. Further, the lens base 360 may be made of a metal, and may be bonded to the metal base 310 by soldering or the like. Further, the present invention is not limited to the bonding alone, and may be buried and disposed in a resin except for the main surface in the optical axis direction. By soldering, the amount of deformation due to changes in temperature and humidity can be reduced, and more stable characteristics can be easily obtained.

[0048] The lens base 360 is not limited to the configuration described above. For example, although the holding portion 362 is configured as a pair, the holding portion 362 may have a substantially cylindrical shape, for example. Furthermore, the holding recess 362A has been described as being provided in the holding portion 362, but any structure for holding the holding portion 362 in at least two different directions in the radial direction, for example, a rectangular recess or a facing surface of the holding portion 362. For example, two claw portions or the like protruding in the direction may be provided. The mounting portion 364 is not limited to the configuration having the pair of legs 364A, but may be any shape that can be mounted on the base 310, for example, the surface of the contact portion 361 opposite to the contact surface 361B may be referred to as the mounting surface 364B. The attached portion 364 may be used. In addition, since the legs 364A are configured to protrude, even if the adhesive protrudes from the mounting surface 364B, it is possible to prevent the adhesive from advancing into the optical path. Characteristics are easily obtained. Further, the engaging concave portion is not limited to the V-groove shape, and may have any shape such as a conical concave portion.

[0049] Then, a lens in which the cylindrical lens 345 and the lens base 360 are integrally formed may be attached. In this case, the number of components can be reduced, and for example, the work of mounting the cylindrical lens 345 on the lens base 360 becomes unnecessary, and the assembling manufacturability can be improved. Further, since the V-groove portion 363 and the mounting portion 364 are provided on the body of the cylindrical lens 345, the holding portion 362 becomes unnecessary, and further miniaturization can be easily achieved.

[0050] In addition, the cylindrical lens 345 has at least one plane as an example of the configuration having a pair of opposing planes as long as it has at least one plane. That is, the radial dimension can be reduced even on one plane, and the size can be easily reduced. As described above, by providing a pair, miniaturization can be easily achieved. In addition, the other parts are in the peripheral state, It is preferable because it can be held by a simple configuration such as combining.

[0051] In addition, specific structures and procedures for implementing the present invention can be appropriately changed to other structures or the like as long as the object of the present invention can be achieved.

[Effects of Embodiment]

As described above, the positional relationship between the two positions A and B of the cylindrical lens 345 that condenses the DVD laser light from the semiconductor laser 320 into a substantially linear shape due to astigmatism at the position of the light receiving surface of the light receiving element 350 Then, while the cylindrical lens 345 is positioned, the position is adjusted and fixed in the optical axis direction Z, two orthogonal radial directions X and Y, and the rotation direction R. For this reason, the cylindrical lens 345, which is easier to downsize than the light-receiving element 350, is moved in four directions to adjust the position so as to obtain an appropriate focusing state. The optical pickup 300 can be downsized to a size where the light receiving element 350 can be arranged, which does not need to be performed.

Further, a holding portion 362 having an opening 362B facing at least the position plane of the peripheral edge of the cylindrical lens 345 and holding the peripheral edge of the cylindrical lens 345 in a direction intersecting the optical axis direction, and a cylindrical lens 345 An abutting portion 361 having an abutting surface 361B with which one peripheral edge in the optical axis direction abuts; a V-groove portion 363 provided on an outer surface of the holding portion 362 and held by the supporting device being detachably engaged and held. A lens base 360 having a mounting portion 364 having a mounting surface 364B mounted on the base 310 at the tip is used. For this reason, it becomes easy to dispose the cylindrical lens 345 in a predetermined posture by the support device, and for example, it is possible to position the cylindrical lens 345 in a plurality of directions such as the optical axis direction of the cylindrical lens 345, two orthogonal radial directions, and the rotating direction. Adjustment is easy, and the cylindrical lens 345 can be easily arranged with a simple configuration.

The present invention can be used as an optical pickup having an optical element, a method of manufacturing the same, and a holding device, and can be used in a disk device for processing a disk-shaped recording medium such as an optical disk.

Claims

The scope of the claims

[1] a housing,

A light source disposed in the housing and emitting outgoing light for irradiating the object to be irradiated;

Light receiving means for receiving at least a part of the emitted light reflected by the irradiation object and outputting a predetermined signal;

A cylindrical lens having at least one flat surface at a periphery thereof, and irradiating at least a part of the outgoing light reflected from the irradiation object to the light receiving unit;

A fixing member for fixing the cylindrical lens, the position of which is adjusted in four directions of two radial directions and a rotation direction orthogonal to the optical axis direction, to the housing,

An optical pickup characterized by comprising:

[2] The optical pickup according to claim 1, wherein

The fixing member includes a holding member that holds the cylindrical lens and is provided in the housing.

An optical pickup characterized in that:

[3] The optical pickup according to claim 2, wherein

The holding member is adhered and fixed to the housing in a state where the position of the cylindrical lens is adjusted by a support device in four directions of an optical axis direction of the cylindrical lens to be held, two radial directions orthogonal to each other, and a rotation direction, The support device was released and held

An optical pickup characterized in that:

[4] The optical pickup according to any one of claims 1 to 3, wherein

The cylindrical lens had a pair of radially corresponding flat surfaces.

An optical pickup characterized in that:

[5] A method for manufacturing an optical pickup including a light source and a cylindrical lens that converges at least a part of the output light output from the light source and reflected by the object to be irradiated on the light receiving means, The light is condensed in a substantially linear shape due to astigmatism at the position of the light receiving means. The optical axis direction of the cylindrical lens and two radial directions orthogonal to each other in a state where the cylindrical lens is at least positioned between two positions of the cylindrical lens. and Adjust the position in the four circumferential directions,

With this position adjusted, position and fix the cylindrical lens

A method for manufacturing an optical pickup.

[6] A holding device for forming an optical pickup by disposing a cylindrical lens having at least one flat surface at a periphery in a housing,

A holding portion having an opening facing at least one plane of a peripheral edge of the cylindrical lens, and holding the peripheral edge of the cylindrical lens in a direction intersecting the optical axis direction; and the cylindrical member provided in the holding portion. A contact portion having a contact surface with which one peripheral edge of the lens in the optical axis direction contacts,

An engagement recessed portion provided on an outer surface of the holding portion and supported and held by the supporting device in a detachable manner;

A mounting portion provided on one end side in the axial direction of the holding portion and having a mounting surface mounted on a mounted portion at a tip thereof;

A holding device comprising:

[7] The cylindrical lens in the optical pickup according to any one of claims 1 to 4, wherein the cylindrical lens is disposed in the housing, or the cylindrical lens in the method for manufacturing an optical pickup according to claim 5 is positioned. A holding device for fixing, the holding portion having an opening facing at least one plane of a peripheral edge of the cylindrical lens, and holding the peripheral edge of the cylindrical lens in a direction crossing the optical axis direction, A contact portion provided on the holding portion and having a contact surface with which one peripheral edge in the optical axis direction of the cylindrical lens contacts;

A holding device comprising:

[8] The holding device according to claim 6 or 7, wherein

The holding section is in a state where the optical axis direction of the cylindrical lens is substantially located at the center axis. Formed into a substantially cylindrical shape to be inserted into

A holding device characterized by the above-mentioned.

[9] The holding device according to any one of claims 6 to 8, wherein

The engagement recess is formed in a substantially V-groove shape in a direction substantially orthogonal to an opening surface opened by the opening.

A holding device characterized by the above-mentioned.

[10] The holding device according to any one of claims 6 to 9, wherein

The opening is formed in a shape that allows the support device to recognize a plane direction of one plane of the cylindrical lens held by the holding device.

A holding device characterized by the above-mentioned.

[11] The holding device according to any one of claims 6 to 10, wherein

The leg portion is formed in a shape in which a width dimension in a direction corresponding to a circumferential direction of the held cylindrical lens gradually decreases toward a tip end.

A holding device characterized by the above-mentioned.