CN1341924A - Composite optical component and composite optical unit thereof - Google Patents

Composite optical component and composite optical unit thereof Download PDF

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Publication number
CN1341924A
CN1341924A CN01119868A CN01119868A CN1341924A CN 1341924 A CN1341924 A CN 1341924A CN 01119868 A CN01119868 A CN 01119868A CN 01119868 A CN01119868 A CN 01119868A CN 1341924 A CN1341924 A CN 1341924A
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CN
China
Prior art keywords
mentioned
composite optical
laser
light
beam shaping
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN01119868A
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Chinese (zh)
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CN1177320C (en
Inventor
山下龙磨
古田贤治
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alps Alpine Co Ltd
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Alps Electric Co Ltd
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Filing date
Publication date
Priority claimed from JP2000202389A external-priority patent/JP2002025100A/en
Priority claimed from JP2000214879A external-priority patent/JP2002032930A/en
Application filed by Alps Electric Co Ltd filed Critical Alps Electric Co Ltd
Publication of CN1341924A publication Critical patent/CN1341924A/en
Application granted granted Critical
Publication of CN1177320C publication Critical patent/CN1177320C/en
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/127—Lasers; Multiple laser arrays
    • G11B7/1275—Two or more lasers having different wavelengths
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1353—Diffractive elements, e.g. holograms or gratings
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372—Lenses
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs
    • G11B2220/2545—CDs

Abstract

The invention discloses a composite optical component and composite optical unit. The composite optical member consisting of the molding of a transparent resin and having a incident plane for a laser beam emitted from a double wavelength laser diode, a light-reflecting surface to reflect the laser beam emitted from the double wavelength laser diode and on which a return light beam from an optical disk is made incident, and a reflecting surface to guide the return light beam from the optical disk to a light receiving member, is mounted on the complex optical unit. The incident plane is formed so as to have a concave surface in a cylindrical shape, and a light-reflecting surface is formed so as to have a convex face in a cylindrical shape having a different curvature from the incident plane, or the incident plane is inclined with respect to the incident direction of the laser beam emitted from the double wavelength laser diode. Thereby, the beam shaping function is given to the complex optical member.

Description

Composite optical component and composite optical unit thereof
Technical field
The present invention relates to the composite optical unit that for example in the pick-up body of optical disc apparatus, comprises, particularly, relate to the installation constitution of beam shaping parts to the shell that comprises luminous component.
Background technology
At first, according to Figure 22 and Figure 23 the existing optical unit that comprises compact disc (CD) usefulness of composite optical component is described.Figure 22 is the schematic partial sectional view of existing optical unit 50, and Figure 23 is the partial, exploded perspective view of existing optical unit 50.
As shown in figure 22, this optical unit 50 is made of following part: penetrate the laser (wavelength 780nm band) that compact disc uses light source 46, receive by the photosensitive-member 47 of compact disc (not shown) institute laser light reflected, have light source 46 and photosensitive-member 47 baseplate part 48a, be fixed on baseplate part 48a go up so that contain the side wall portion 48b of light source 46 and photosensitive-member 47, as the injection part 48d of the openning of side wall portion 48b, be bonded into the composite optical component 49 of light transmission of the glass etc. of covering injection part 48d.
Light source 46 fixed bondings are on baseplate part 48a, so that relative with composite optical component 49, photosensitive-member 47 approaches light source 46 and is formed on the surface of baseplate part 48a.Be formed on diffraction grating 49a on composite optical component 49 upper surfaces penetrating from light source 46 and carrying out diffraction and be transmitted on the preposition of photosensitive-member 47 by the back light that compact disc reflected.And, for the tracking Control of carrying out being undertaken, on the lower surface of composite optical component 49, be provided as the light beam formation 49b of portion of diffraction grating by the three beams method.
Composite optical component 49 as shown in figure 23, with respect to the shell of being made up of baseplate part 48a and side wall portion 48b, is raising the lay the grain axle with the x direction of optical axis N quadrature and y direction and as the θ direction around the sense of rotation of optical axis.Keep composite optical component 49 with the anchor clamps that have micro-adjusting mechanism (not shown), carry out the optical axis cooperation of these composite optical components 49 and shell by the micro-adjusting mechanism of operation x direction, y direction and θ direction.After the optical axis cooperation was finished, this composite optical component 49 bonded on the injection part 48d of shell.
Summary of the invention
The related optical unit 50 of above-mentioned existing example must be with the anchor clamps that comprise micro-adjusting mechanism, x direction, y direction and θ direction are carried out the optical axis cooperation of composite optical component 49 with respect to shell, and, because this setting range is small, so the adjustment operation of optical axis is difficulty very, be difficult to the problem that high-level efficiency is made high-precision optical unit 50 thereby exist.
And, after the optical axis of 49 pairs of shells of composite optical component cooperates end, need bond to composite optical component 49 on the shell, therefore,, there is the complicated problem of flow chart from this point.
And, in the related optical unit 50 of existing example, be not shaped as circular beam shaping parts owing to do not comprise the some shape that is used for from the emitted laser of light source 46, the waste that then shines the laser power on the CD is more, can not be used for the Worm type of the bigger laser power of installation requirement or the problem that rewriting type optical disk is carried out the optical disc apparatus of recording of information and playback and exist.In the case, if beam shaping parts such as triangular prism and the cylindrical lens optical unit 50 of packing into, just can overcome related defective, but, when use comprises that the anchor clamps of micro-adjusting mechanism come to carry out these beam shaping parts to the packing into of shell in the same manner with above-mentioned composite optical component 49, further reduced the manufacturing efficient of optical unit 50, therefore, required to improve the installation constitution of beam shaping parts to shell.
In order to solve the problems of the technologies described above, the purpose of this invention is to provide a kind of composite optical unit, can be easily and carry out of the installation of beam shaping parts accurately to shell.
Composite optical unit of the present invention, luminous component and beam shaping parts are set in the enclosure integratedly, therefore, the waste that shines the laser power on the CD can be reduced, the light picker of the optical disc apparatus of the bigger laser power of the needs of Digital video disc device etc. for example can be suitable for.And, between the inside surface of shell and beam shaping parts, be provided with: be used for the confine optical beam orthopaedic component with respect to first restraint device from the angle of inclination of the optical axis of the emitted laser of luminous component; Be used for the confine optical beam orthopaedic component with respect to second restraint device from the sense of rotation position of the optical axis of the emitted laser of luminous component, thus, can be pressed into the beam shaping parts in the shell, and, can finish the stance adjustment of beam shaping parts automatically, when the beam shaping parts are installed, do not need to be used for especially the anchor clamps that the position is adjusted in shell the optical axis of laser, therefore, can easily comprise the assembling of the composite optical unit of beam shaping parts.
And, composite optical unit of the present invention, the flange part that in the beam shaping parts, forms beam shaping portion and stretch out from this beam shaping portion and be formed on restriction teat on this flange part, on the inside surface of shell, form the stage portion and the restriction ditch that inserts above-mentioned restriction teat of the end face of the above-mentioned flange part of contact, end face with above-mentioned stage portion and above-mentioned flange part constitutes above-mentioned first restraint device, simultaneously, has above-mentioned restriction ditch and above-mentioned restriction teat constitutes above-mentioned second restraint device, thus, the assembly force that acts between shell and the beam shaping parts is affacted in the beam shaping portion, and can prevent the distortion and the displacement of beam shaping portion, therefore, can improve the optical characteristics of the composite optical unit that comprises the beam shaping parts.
And, composite optical unit of the present invention, as the beam shaping parts, use forms cylindrical lens in beam shaping portion, dispose the central shaft of this cylindrical lens coaxially and from the optical axis of the emitted laser of luminous component, lens face with respect to cylindrical lens is vertically injected above-mentioned laser, on the central axis direction of cylindrical lens, penetrate by the laser of beam shaping, thus, just can needn't increase the radial dimension of shell, and the beam shaping parts are set in the enclosure, can constitute the composite optical unit that comprises the beam shaping parts compactly.
And, composite optical unit of the present invention, as the beam shaping parts, use forms triangular prism in beam shaping portion, the plane of incidence with respect to this triangular prism, dispose obliquely from the optical axis of the emitted laser of luminous component, the plane of incidence with respect to triangular prism is injected laser obliquely, on the central axis direction of shell, penetrate by the laser of beam shaping, thus, of beam shaping parts installation portion and the composite optical component installation portion inclination of the luminous component installation portion of shell can be made, and the installation of luminous component can be simplified with respect to the luminous component installation portion with respect to shell.
And, composite optical unit of the present invention, on the outer peripheral face of the flange part that constitutes the beam shaping parts, at least three fixing projections of using on the inside surface that is crimped on shell equally spaced are set, thus, can be fixed on the shell, just not need the bonding fixation that waits other by being pressed into the beam shaping parts, therefore, can simplify the assembling of the composite optical unit that comprises the beam shaping parts.
And, composite optical unit of the present invention, luminous component and beam shaping parts are set in the enclosure integratedly, therefore, the waste that shines the laser power on the CD can be reduced, the light picker of the optical disc apparatus of the bigger laser power of the needs of Digital video disc device etc. for example can be suitable for.And, make light-beam forming unit with from the plane of incidence of the emitted laser of luminous component, form from the back light plane of incidence of the back light of CD, the reflecting surface that the back light from CD is transmitted on the photosensitive-member from exit facet, the incident of the emitted laser of luminous component, thus, do not need mutually adjusting of these parts, can seek the summary of the miniaturization and the assembling of composite optical unit.
And, composite optical unit of the present invention, as light-beam forming unit, make the plane of incidence of composite optical component form columniform concave surface, simultaneously, make the exit facet of this composite optical component form the curvature columniform convex surface different with the above-mentioned plane of incidence, thus, can easily make and design, and, composite optical component can easily be made with high-precision beam shaping function.
And, composite optical unit of the present invention, as light-beam forming unit, the plane of incidence of composite optical component is tilted with respect to the incident direction from the emitted laser of luminous component, thus, can easily make and design, and, composite optical component can easily be made with high-precision beam shaping function.And composite optical unit of the present invention on the plane of incidence of composite optical component, is provided with being divided into the light diffraction device of a plurality of light beams from the emitted laser of luminous component, thus, and the optical disc apparatus that the compact disc that can be suitable for packing into is carried out the playback of information.
Description of drawings
Below in conjunction with accompanying drawing to composite optical component involved in the present invention and comprise that its composite optical unit is elaborated.
Fig. 1 is the synoptic diagram of the related optical take-up apparatus 100 of expression first embodiment;
Fig. 2 is the skeleton view of the part section of two related long wavelength laser diodes 102 of first embodiment;
Fig. 3 is the front view of the related composite optical component of first embodiment 105;
Fig. 4 is the left surface figure of Fig. 3;
Fig. 5 is the right hand view of Fig. 3;
Fig. 6 is the figure that sees from the direction 6 of Fig. 3;
Fig. 7 is the planimetric map of the related beam shaping parts 109 of first embodiment;
Fig. 8 is the sectional drawing along the 8-8 line of Fig. 7;
Fig. 9 is the planimetric map of the related shell of first embodiment 106;
Figure 10 is the 10-10 sectional drawing of Fig. 9;
Figure 11 is the left surface figure of Fig. 9;
Figure 12 is the right hand view of Fig. 9;
Figure 13 is the figure that sees from the direction 13 of Figure 10;
Figure 14 is the schematic partial sectional view along the 14-14 among Fig. 1;
Figure 15 is the functional schematic of the related composite optical component of first embodiment 105;
Figure 16 is the schematic partial sectional view of the related composite optical unit of second embodiment;
Figure 17 is the sectional drawing of the beam shaping parts 109 that comprise in the related composite optical unit of second embodiment;
Figure 18 is the synoptic diagram of the related optical take-up apparatus 100 of expression the 3rd embodiment;
Figure 19 is the front view of the related composite optical component of the 3rd embodiment 105;
Figure 20 is the functional schematic of the related composite optical component of the 3rd embodiment 105;
Figure 21 is the schematic partial sectional view of the related composite optical unit of the 4th embodiment;
Figure 22 is the schematic partial sectional view of existing optical unit 50;
Figure 23 is the partial, exploded perspective view of existing optical unit 50.
The specific embodiment
Describe the first embodiment of the present invention in detail below with reference to Fig. 1 to Figure 15.
As shown in Figure 1, optical take-up apparatus 100 mainly is made of following part: pick-up Body is carrier 500, be configured in composite optical unit 101 in this carrier 500, flat Tabular speculum 300, collimation lens 400, object lens 200. At composite optical unit Comprise beam shaping parts 109 in 101.
Optical take-up apparatus 100 is faced CD for example compact disc 61 or digitized video CD (DVD) 62 and disposing, as and compact disc 61 (Digital video disc 62) The panel surface quadrature direction focusing (F) direction and as compact disc 61 (digitlizations Movable support mirror 200 on the tracking of radial direction video disc 62) (T) direction. And And object lens 200 constitute and can be adapted to compact disc 61 and Digital video disc 62 both sides.
Composite optical unit 101 is so luminous one-piece type optics elements of sensitization: swashing Illumination is mapped on the CD, by receiving the reverberation (back light) from CD, resets Be recorded in the information on the CD, perhaps, recorded information on the CD. As shown in Figure 1, It mainly is made of following part: as two long wavelength laser diodes of luminous component 102, the built-in photosensitive-member 104 of photo-sensitive cell 104a, composite optical component 105, Beam shaping parts 109, printed circuit board (PCB) 107, these parts install and fix outside Shell 106.
As shown in Figure 2, two long wavelength laser diodes 102 are made up of following part: plectane The matrix part 102a of shape, establish from the side's of matrix part 102a planar portions 102a ' is outstanding The base station 102b of the square bodily form of putting, locate and be fixed on the sidewall surfaces of base station 102b On chip of laser 103, be fixed on the upper body by tubular of planar portions 102a ' The sky plate 102d of the 102c of section and formation peristome 102d ' forms to contain base station 102b's The 102e of cap section, be fixed into transparent from the inboard occlusion of openings 102d ' of section of the 102e of cap section Discoideus glass plate 102f. Has matrix part 102a, the 102e of cap section and glass Plate 102f and configuration chip of laser 103 in the airtight space that consists of. At this laser instrument In the chip 103, separate small interval D and form: the ejaculation Digital video disc is used The light source 103a of short wavelength's's (wavelength 650nm band) laser 103a ' and ejaculation compact disc With long wavelength's's (wavelength 780nm band) the light source 103b of laser 103b '. And, In the present embodiment, interval D is set at 120 μ m. And, Digital video disc With 650nm band, specifically, adopt 635nm or 650nm as digitlization The video disc standard.
And from light source 103a, laser 103a ', the 103b ' that 103b penetrates respectively is logical Cross peristome 102d ' and penetrate, so as with the side's of matrix part 102a planar portions 102a ' Become on the direction of quadrature and be parallel to each other. And, the ejaculation position of laser 103a ', 103b ' The top end surface 103 ' that is set to chip of laser 103 (is configured to and planar portions 102a ' Parallel) same plane on. And, from the side's of matrix part 102a planar portions The opposing party's of 102a ' opposite side planar portions is given prominence to a plurality of external connection terminals is set 102g (with reference to Fig. 1), 102g carries out to chip of laser by this external connection terminals The power supply of 103 drive current.
And, in the operation of making two long wavelength laser diodes 102, comprise two light The chip of laser 103 of source 103a, 103b on predetermined substrate surface by with half Conductor is processed similar processing and is processed, therefore, and each light source 103a, 103b Between interval D easily the high accuracy adequate relief become predetermined value. Therefore, do Be discrete parts, can produce in a large number, and, two long wavelength laser diodes 102 Cost can be cheap.
Photosensitive-member 104, as shown in Figure 1, built-in photo-sensitive cell 104a, and by The photosurface side of this photo-sensitive cell 104a arrange sensitization window 104b ' assembly 104b and from The outstanding external connection terminals 104c that is set to both sides of assembly 104b consists of, by outside The splicing ear 104c of section carry out to the supply voltage of photo-sensitive cell 104a provide and by The signal of photo-sensitive cell 104a institute light-to-current inversion is to the output of outside.
Fig. 3 to composite optical component 105 shown in Figure 6 by the higher resinous wood of transparency The formed body of material forms, by the both ends of the surface of optical axis N direction formed slightly circular cone abreast The matrix part 105c of shape, from the emitted laser of above-mentioned two long wavelength laser diodes 102 Plane of incidence 105a, from the emitted laser of above-mentioned two long wavelength laser diodes 102 The exit facet 105b that penetrates towards CD, be transmitted to the back light from CD above-mentioned Reflecting surface 105d on the photo-sensitive cell 104a forms. And, at present embodiment In the related composite optical component 105, two end faces of matrix part 105c become respectively Be plane of incidence 105a and the exit facet 105b of laser, from the incident of the back light of CD The face dual-purpose is above-mentioned exit facet 105b, injects above-mentioned exit facet from the back light of CD 105b.
As shown in Figure 3 and Figure 4, made from two wavelength lasers two by above-mentioned plane of incidence 105a The laser diffraction that utmost point pipe 102 is emitted is formed for generating and is radiated on the compact disc The three beams of the three beams that tracking control usefulness and data playback are used generates uses diffraction grating 105h such as Fig. 6 and shown in Figure 8, is formed for handle at the central portion of exit facet 105b Be transmitted to the first square diffraction grating on the reflecting surface 105d from the back light of CD 105f.
Reflecting surface 105d becomes to tilt with respect to the both ends of the surface of composite optical component 105 The inclined plane on the surface of this reflecting surface 105d, as shown in Figure 3 and Figure 4, forms Be used for to proofread and correct the second diffraction grating 105g of reflection-type in the path of back light. By this Passing through on the path of the back light that reflecting surface 105d reflects, flat surfaces 105n strides across The side face of matrix part 105c and forming. And, as shown in Figure 6, from this flat surfaces The edge part of 105n is for the face of cylinder of the focus control of carrying out being undertaken by method of astigmatism 105i forms the ditch shape that becomes predetermined angular d with optical axis N, in the 105i of this face of cylinder Wall becomes back light exit facet 105p.
And, in the related composite optical component 105 of present embodiment, above-mentioned first Diffraction grating 105f, the second diffraction grating 105g and three beams diffraction grating 105h With above-mentioned plane of incidence 105a, exit facet 105b, matrix part 105c, reflecting surface 105d Use together mould with face of cylinder 105i and one-body molded. For these diffraction lights The function of grid 105f, 105g, 105h is described in detail in the back.
Matrix part 105c forms: from plane of incidence 105a to exit facet 105b side diameter The virtually conical shape that diminishes successively is in the leading section formation cylindrical portion of this matrix part 105c 105j, its face of cylinder 105j ' becomes first of 105 pairs of shells 106 of composite optical component Restriction section.
As shown in Figure 3 and Figure 4, the rear end side at this matrix part 105c is plane of incidence 105a On the outer peripheral face of the forming portion side of reflecting surface 105d, has half-terete outer surface 4 protuberance 105k ' at circumferentially approximate equality ground configuration, these protuberances 105k ' End face become the second restriction section of 105 pairs of shells 106 of composite optical component. And, (comprise the part of above-mentioned plane of incidence 105a and upper at the rear end face of this matrix part 105c State the part of reflecting surface 105d) on, such as Fig. 3, Fig. 5 and shown in Figure 15, with on State the relative part of each protuberance 105k ', with the recessed buffering that is formed for of desired depth The spatial portion 105s of the pressing-in force of 105 pairs of shells 106 of composite optical component. And, as Fig. 3 at the central portion of matrix part 105c, gives prominence to forming cylinder to shown in Figure 6 downwards The position limitation protuberance 105m of shape, its outer peripheral face becomes 105 pairs of composite optical components The 3rd restriction section of shell 106.
And the composite optical component 105 of present embodiment is exit facet 105b and returning The light echo plane of incidence still, also can arrange respectively exit facet and return as same surface Light entrance face forms first diffraction grating at this back light plane of incidence.
Fig. 7 and beam shaping parts 109 shown in Figure 8 are by the high resin material of transparency Formed body form the 109a of beam shaping section, from the 109a of this beam shaping section to overhanging The discoid flange part 109b that goes out, from the outstanding pin of the outer peripheral face of this flange part 109b Shape restriction protuberance 109c, roughly equally spaced outstandingly be arranged on this flange part 109b's On the outer peripheral face 3 are half-terete fixingly to be formed with projection 109d. Such as Fig. 8 Shown in, on the 109a of beam shaping section, form cylindrical lens, this cylindrical lens One side 109a " form planely, its opposite face (lens face) 109a ' forms cylindric Concave surface. As shown in Figure 7, the 109a of this beam shaping section is formed on flange part 109b's Central part. Above-mentioned fixing with the thickness direction difference of projection 109d at flange part 109b Form abreast, its top becomes first limit of 109 pairs of shells 106 of beam shaping parts Section processed. And as shown in Figure 7, restriction protuberance 109c is with respect to face of cylinder 109a ' Center of curvature axle S-S vertically form, its side face becomes 109 pairs of beam shaping parts The second restriction section of shell 106.
Above-mentioned beam shaping parts 109, as shown in Figure 2, face of cylinder 109a ' towards Two long wavelength laser diodes, 102 sides are installed in the shell 106, from two wavelength lasers two The point shape of the laser that utmost point pipe 102 penetrates is shaped as circle. That is, owing to swash from two wavelength The point of the laser that optical diode 102 penetrates is shaped as ellipse, makes its major diameter direction parallel Ground is towards above-mentioned center of curvature axle S-S, to the 109a of beam shaping section (cylindrical lens) Inject laser, thus, minor axis direction that can expansion of laser light, and the some shape of laser Be shaped as circle.
The piece that Fig. 9～shell 106 shown in Figure 13 is made by the aluminum dipping form casting forms, and is main By tubular body 106g, respectively outwards square from the both ends of this tubular body 106g The outstanding installation portion 106h that arranges, 106i forms. At these installation portions 106h, 106i Upper square installed surface 106h ', the 106i ' of forming respectively.
As shown in figure 10, the inner surface in the left part of tubular body 106g forms Be used for holding the accommodating chamber 106a of two long wavelength laser diodes 102 shown in Figure 2, connect It, recessedly on the left side be formed for the location and two long wavelength laser diodes are installed 102 installation pit hole 106b. And, in the substantial middle section of tubular body 106g Inner surface on recessedly be formed for locating and installation diagram 7 and beam shaping shown in Figure 8 The stage portion 106m of parts 109. And, in the right part of tubular body 106g Be formed for holding Fig. 3 on the inner surface to the appearance of composite optical component 105 shown in Figure 6 Receive chamber 106c, form respectively to insert in its both end sides and be formed on above-mentioned composite optical component The first restriction receiving portion 106j and slotting of the first restriction section (face of cylinder 105j ') on 105 Enter to be formed on the second restriction section (protuberance 105k ') on the above-mentioned composite optical component 105 The second restriction receiving portion 106k. These each accommodating chamber 106a, 106c and stage portion 106m forms with one heart with respect to central shaft N '.
Above-mentioned stage portion 106m forms such position: when touching beam shaping section During the flange part 109b of part 109, the 109a of beam shaping section is set to two wavelength lasers On the precalculated position between diode 102 and the composite optical component 105. And, above-mentioned The diameter of the beam shaping component settings side of stage portion 106m forms than external as light The fixing of the first restriction section of 109 pairs of shells 106 of bundle orthopaedic component used projection 109d's The smaller diameter of external diameter of a circle on top is by being pressed into beam shaping parts 109 energy Enough be fixed.
Form like this for the accommodating chamber 106c that holds above-mentioned composite optical component 105 Conical surface-shaped: the accommodation section 106k that is used for holding above-mentioned two long wavelength laser diodes 102 The diameter of side is bigger, extends to installed surface 106i ' side and reduces successively diameter. And, The diameter of the first restriction receiving portion 106j is set to such size: can high accuracy The cylindrical portion 105j (diameter D1) of the chimeric composite optical component 105 in ground (with reference to Fig. 3), The diameter of the second restriction receiving portion 106k is set to such diameter: slightly less than outside Be connected in each protuberance 105k ' on the rearward end 105k of composite optical component 105 The external diameter of a circle D2 (with reference to Fig. 4) on top, by being pressed into composite optical component 105 can be fixed.
Leading section at above-mentioned accommodating chamber 106c is formed for locating in central shaft N ' direction The location division of composite optical component 105 namely contacts face 106c '. Contact face 106c ' at this On offer circular peristome 106f so that be located at first on the composite optical component 105 Diffraction grating 105f exposes from the place ahead.
And, on above-mentioned tubular body 106g, such as Figure 10 and shown in Figure 13, Be formed on above-mentioned accommodating chamber 106a, the upper U font that connects of 106c and stage portion 106m Position limitation ditch 106d be connected with rear end with this position limitation ditch 106d and upper State the fan-shaped guiding ditch 106d ' of the rear end perforation of accommodating chamber 106a. Above-mentioned position limitation The ditch width of ditch 106d is set to so predetermined size: outstanding be arranged on above-mentioned The outer peripheral face of restriction protuberance 109c on the beam shaping parts 109 and outstanding being arranged on The outer peripheral face of position limitation protuberance 105m on the composite optical component 105 can be high-precision Degree ground is chimeric. And, at the above-mentioned position limitation ditch near this tubular body 106g The part of 106d is formed for disposing the configuration plane 106e of photosensitive-member 104. This configuration Face 106e, as shown in Figure 1, when at above-mentioned installation portion 106h, the installed surface of 106i 106h ', when the upper installation of 106i ' is electrically connected the printed circuit board (PCB) 107 of photosensitive-member 104, At above-mentioned each installed surface 106h ', form needed step between the 106i ', so that sense Light parts 104 can not affect shell 106.
And the piece that is used for shell 106 not only can be made of aluminum die cast, also can Consisted of by zinc die casting, magnesium alloy or other metal etc.
Below, with reference to Fig. 1 come to two long wavelength laser diodes 102, photosensitive-member 104, Composite optical component 105 and beam shaping parts 109 advance to the installation method of shell 106 The row explanation.
Position limitation protuberance 105m be formed on guiding ditch on the shell 106 Under the state of the peristome alignment of 106d ', from the installation pit hole 106b insertion of shell 106 Composite optical component 105, with not shown needed anchor clamps, compress equably remove into Penetrate the outer surface of diffraction grating 105h of face 105a, thus, this matrix part 105c embedding Enter in the accommodating chamber 106c. Then, touch in the outer edge of exit facet 105b and be formed on In the stage of the face that contacts 106c ' among the accommodating chamber 106c of shell 106, finish central shaft N ' direction is to the location of shell 106.
At this moment, the cylindrical portion 105j that is located on the matrix part 105c is entrenched in accommodating chamber On the first restriction receiving portion 106j of 106c, therefore, the cylindrical portion of matrix part 105c The face of cylinder 105j ' of 105j (restriction face is with reference to Fig. 3) touches the first restriction receiving portion On the 106j, with the position of the direction of optical axis N quadrature in the leading section of matrix part 105c Restriction is finished accurately. And, meanwhile, the rearward end of matrix part 105c 105k is pressed into and is located at the restriction of second on accommodating chamber 106c receiving portion 106k. At this moment, As shown in figure 15, be formed on each protuberance 105k ' on the outer peripheral face of rearward end 105k Become respectively the state of even compression, the top end face (restriction face) of each protuberance 105k ' Contact with the second restriction receiving portion 106k, with the rearward end 105k of matrix part 105c In the position limitation of direction of central shaft N ' quadrature finished accurately, simultaneously, Prevented the disengaging of composite optical component 105 from accommodating chamber 106c. And, by handle Composite optical component 105 embeds the accommodating chamber 106c that is located on the shell 106, is formed on Outside position limitation protuberance 105m on the composite optical component 105 is directed to and is formed on Among the guiding ditch 106d ' in the shell 106, be embedded into position limitation ditch 106d, therefore, around The position limitation of the direction of rotation of central shaft N ' is finished accurately.
Like this, the composite optical unit 101 of present embodiment not only can be complex optics Parts 105 embed shell 106, and can carry out 105 pairs of shells of composite optical component The position limitation of 106 central shaft N ' direction, with the position of the direction of central shaft N ' quadrature Put restriction, around the position limitation of the direction of rotation of central shaft N ', therefore, can be easy And carry out accurately the assembling of composite optical unit 101. And, present embodiment Composite optical unit 101, with composite optical component 105 in protuberance 105k ' The recessed formation spatial portion of the part 105s that forming portion is corresponding, therefore, when outstanding each When the top end face (restriction face) of the 105k ' of section touches on the second restriction receiving portion 106k, each The forming portion of individual protuberance 105k ' is in spatial portion 105s side strain, thus, and its pressure Enter power and relaxed, can prevent from surpassing necessary pressing-in force and be applied to composite optical component On 105, can prevent the distortion of optical function section, particularly the second diffraction grating 105g With the distortion of three beams with diffraction grating 105h.
From the outstanding pin-shaped restriction protuberance 109c of the outer peripheral face of flange part 109b with Be formed under the state that the peristome of the guiding ditch 106d ' on the shell 106 aligns, from The installation pit hole 106b of shell 106 inserts beam shaping parts 109, with not shown Needed anchor clamps, the one side of the 109b of press flange section thus, is embedded into equably Among the stage portion 106m to the substantial middle section inner surface that is formed on shell 106. Connect , touch stage portion 106m's at the opposite face with the compression side of flange part 109b In stage, the location of the central shaft N ' direction of shell 106 is done.
And, meanwhile, be formed on three and half on the outer peripheral face of flange part 109b Columned fixing top with projection 109d (the first restriction section) is pressed into shell 106 Inner surface, therefore, with the position limitation of the direction of central shaft N ' quadrature by high accuracy Finish, simultaneously, prevent that beam shaping parts 109 from coming off from stage portion 106m. And And, along with the insert action of 109 pairs of shells 106 of beam shaping parts, from flange part The restriction protuberance 109c that the outer peripheral face of 109b is given prominence to (the second restriction section) is directed into Be formed among the guiding ditch 106d ' on the shell 106, and be embedded into the position limitation ditch 106d, therefore, around the position limitation of the direction of rotation of central shaft N ' with accurately complete Become.
Like this, the composite optical unit 101 of present embodiment not only can be beam shaping Parts 109 embed shell 106, and can carry out 109 pairs of shells of beam shaping parts The position limitation of 106 central shaft N ' direction, with the position of the direction of central shaft N ' quadrature Put restriction, around the position limitation of the direction of rotation of central shaft N ', therefore, can be easy And carry out accurately the assembling of composite optical unit 101.
Two long wavelength laser diodes 102 insert shell to the 102e of its cap section (with reference to Fig. 2) In 106 the accommodating chamber 106a, matrix part 102a embedding is formed on peace on the shell 106 Among the hole 106b of dress hole, thus, be fixed on the shell 106. Thus, as shown in figure 15, Can make from the optical axis N of the emitted laser of two long wavelength laser diodes 102 automatically with The central shaft N ' of shell 106 aligns, and can make from two long wavelength laser diodes 102 Emitted laser be injected into the 109a of beam shaping section in the heart, therefore, can The point shape of laser is shaped as circle.
Photosensitive-member 104 is such as Fig. 1 and shown in Figure 15, by printed circuit board (PCB) 107 Be installed on the shell 106. The installation of 104 pairs of printed circuit board (PCB)s 107 of this photosensitive-member this Sample carries out: the sensitization window 104b ' side of handle component 104b is passed and is located at printed circuit board (PCB) 107 On through hole 107a, external connection terminals 104c is clamped to is formed on printed circuit board (PCB) On the 107 lip-deep clamping parts (not shown). And, can be as required, with bonding Agent handle component 104b is firm to be bonded on printed circuit board (PCB) 107 or the shell 106. And And fixedly the printed circuit board (PCB) 107 of photosensitive-member 104 is being configured to sensitization window 104b ' Under the state relative with position limitation ditch 106d on being formed on shell 106, carried At installation portion 106h, each installed surface 106h ' of 106i is on the 106i ', with bolt 108 Carry out spiral and fix, and be fixed on the shell 106. And, carry photosensitive-member 104 Printed circuit board (PCB) 107, when by predetermined benchmark optical system from light source 103a, The laser 103a ' that 103b is emitted, the corresponding back light from CD of 103b ' in advance When carrying out diffraction by the first diffraction grating 105f and the second diffraction grating 105g, be adjusted into The most suitably be directed on the precalculated position P of photo-sensitive cell 104a, then, be fixed on Installed surface 106h ", on the 106i '.
Digital video disc 62 and the densification below optical take-up apparatus 100 carried out The playback action of CD 61 describes.
In the above-described configuration, when playback Digital video disc 62, as shown in Figure 1, The laser 103a ' that penetrates from the light source 103a of two long wavelength laser diodes 102 sees through and forms Three beams on the plane of incidence 105a of composite optical component 105 with diffraction grating 105h and Be transformed to three beams, then, see through the first diffraction grating 105f, 105b penetrates from exit facet Go out.
Then, this laser 103a ' is by being configured to become with the direct of travel of laser 103a ' The speculums 300 of 45 degree and make its angle deflection 90 degree, and inject and be configured in speculum In the parallel light tube lens 400 of 300 top. Then, by these parallel light tube lens 400 and the laser 103a ' that becomes almost parallel light injects object lens 200. By object lens 200 The optically focused effect, be imaged on the information recording surface of Digital video disc 62.
Then, the laser that is reflected by Digital video disc 62 (back light) 103a ' again The inferior object lens 200 that see through, and see through parallel light tube lens 400, anti-by 300 of speculums Penetrate, then, inject and be formed on the back light plane of incidence shown in Figure 1 and namely be formed on exit facet The first diffraction grating 105f on the 105b becomes and is diffracted into one of predetermined angle of diffraction The back light 103a '-2 of inferior diffraction light. Back light 103a '-2 then is formed on multiple The back light reflecting surface 105d that closes on the optics 105 reflects, and incides cylinder Among the face 105i, penetrate from back light exit facet 105p. And, the back light 103a ' of ejaculation-2 by position limitation ditch 106d (with reference to Fig. 8, Figure 11), and incides photosensitive-member On the photosensitive sites P among 104 the photo-sensitive cell 104a.
At this moment, the back light 103a '-2 that is accepted by photo-sensitive cell 104a is carried out light The electricity conversion, thus, by the letter of handle with the information recording surface of Digital video disc 62 Number corresponding electric current output transform is that voltage signal generates replay signal, from photographic department The external connection terminals 104b of part 104 is output, and passes by printed circuit board (PCB) 107 Lead the outside. And, the back light 103a's '-2 that is accepted by photo-sensitive cell 104a A part is used to focus on and follow the tracks of control.
On the other hand, when playback compact disc 61, from two long wavelength laser diodes 102 The laser 103b ' that penetrates of light source 103b, as shown in Figure 1, see through and be formed on complex light Three beams on the plane of incidence 105a of member 105 is transformed to three with diffraction grating 105h Bundle then, sees through the first diffraction grating 105f, penetrates from exit facet 105b. Then, This laser 103b ' identical object lens 200 that are transmitted to during with Digital video disc 62 are logical Cross the optically focused effect of object lens 200, be imaged on the information recording surface of compact disc 61.
Then, the back light 103b ' that is reflected by compact disc 61 sees through object lens again 200, the parallel light tube lens 400, and reflected by speculum 300, then, inject The first diffraction grating 105f becomes a diffraction light being diffracted into predetermined angle of diffraction Back light 103b '-2. Back light 103b '-2 then is formed on composite optical component Back light reflecting surface 105d on 105 " reflect, inject face of cylinder 105i. At cylinder Among the face 105i, back light 103b '-2 is provided for the method for astigmatism of focus control, penetrates Back light exit facet 105p, and by position limitation ditch 106d (with reference to Figure 10, Figure 13), And accepted by the photosensitive sites P among the photo-sensitive cell 104a. At this moment, by photo-sensitive cell The back light 103b '-2 that 104a accepts is carried out light-to-current inversion, thus, and by handle The electric current output transform corresponding with the signal of the information recording surface of compact disc 61 is electricity Press signal, and form replay signal, from the external connection terminals 104b of photosensitive-member 104 Be output, by printed circuit board (PCB) 107, be transmitted to the outside. And, by photo-sensitive cell The part of the back light 103b '-2 that 104a accepts is used to that method of astigmatism carries out The tracking control that focus control and three beams are carried out.
And, in optical take-up apparatus 100, can be at exit facet 105b and object lens 200 Between light path in the laser 103a ' that restriction is penetrated from exit facet 105b is set, 103b ' The wavelength optical filtering etc. of diameter of light beam.
Below to comprise in the composite optical component 105 each diffraction grating 105f, 105g, The function of 105h describes.
As shown in figure 15, with penetrate from the exit facet 105b of composite optical component 105 Laser 103a ', 103b ' corresponding respectively from Digital video disc 62 and densification The back light of CD 61 is respectively by first diffraction grating that is formed on the exit facet 105b 105f institute diffraction, and become back light 103a '-2 and back light 103b '-2. At this moment, Because the wavelength corresponding to the back light 103b '-2 of compact disc 61 is longer than corresponding to number The wavelength of the back light 103a '-2 of word video disc 62, therefore, back light 103b '-2 angle of diffraction (is utilized such greater than the angle of diffraction of back light 103a '-2 Principle: in diffraction grating, wavelength is more long, and angle of diffraction is more big).
And, utilize the poor of this angle of diffraction, make before diffracted laser 103a ', 103b ' light axle base separately is the state of D, as back light 103a '-2, return Light 103b '-2 arrives back light reflecting surface 105d " time, both in-position phases one Cause.
But, at the back light reflecting surface 105d of composite optical component 105 " in, returning Light echo 103a '-2, back light 103b '-2 reflect simply, because both sides' laser The incidence angle difference, just can not make two back light 103a '-2, back light 103b '-2 Consistently towards the photosensitive sites P of photo-sensitive cell 104a. In order to proofread and correct this point, Back light reflecting surface 105d " on the second diffraction grating 105g is set. That is, utilization is incided Back light 103a '-2 among the second diffraction grating 105g and back light 103b '-2 are again The angle of diffraction that is produced by the wavelength difference poor makes by back light reflecting surface 105d " The back light 103a '-2 of reflection and back light 103b '-2 both sides' optical axis are consistent.
Like this, can be the back light by first diffraction grating 105f difference institute diffraction 103a ,-2 and back light 103b '-2 proofread and correct to all by the sensitization position of photo-sensitive cell 104a Put P and accept, even use light source 103a, the 103b of 2 wavelength, also can be with having The photosensitive-member of a photo-sensitive cell 104a is accepted both sides' laser.
As described above, the composite optical unit 101 that present embodiment is related is such as Fig. 1 Shown in, have the shell 106 that is installed on the optical take-up apparatus 100, in shell 106 Install and fix two long wavelength laser diodes 102 and photosensitive-member 104 and the complex light department of the Chinese Academy of Sciences Part 105, two long wavelength laser diodes 102 have the weak point that the emission Digital video disc is used The long wavelength laser two that the laser diode 103a of wavelength laser and emission compact disc are used Utmost point pipe 103b, composite optical component 105 is provided with: from two long wavelength laser diodes 102 The plane of incidence 105a of the light incident of penetrating and the exit facet 105b of ejaculation, to by being located at out Penetrate first diffraction that back light that the CD D1 (D2) on the face 105b reflects carries out diffraction Grating 105f, the back light by the first diffraction grating 105f institute diffraction is reflexed to sensitization Reflecting surface 105d on the parts 104 also is provided with on reflecting surface 105d and makes ripple simultaneously The optical axis of long different light is consistent and be imaged onto on the photosensitive sites P of photosensitive-member 104 The second diffraction grating 105g, therefore, can enough composite optical units 101 Be suitable for using two different wave length pick devices 100. And, photosensitive-member 104 Can be one, can only adjust this photosensitive-member 104 and carry out the position cooperation, because of This can not make the cost of adjusting in the operation increase. And, make from two wavelength lasers, two utmost points Manage the exit facet 105b of 102 emitted laser and incident from the back light of CD The back light plane of incidence is on the same level, therefore, puts from this, can simplify structure Become.
And two long wavelength laser diodes 102 are by matrix part 102a, by the 102e of cap section The assembly that is connected with glass plate 102f, connect from the outstanding outside that arranges of matrix part 102a Terminal 102g consists of, and photosensitive-member 104 is by the built-in group of photo-sensitive cell 104a Part 104b and be located at the institute that the external connection terminals 104c on this assembly 104b consists of The meaning discrete parts is with consisting of the complex optics list with the cheap parts of making of monomer respectively Unit 101, therefore, the processing of each parts becomes easily, and, to the dress of shell 106 Join operation and become easily, can reduce component costs and processing charges.
And, form composite optical component 105 with cheap resin material, simultaneously, When composite optical component 105 moulding, integrally formed first and second diffraction grating of while 105f, 105g, three beams diffraction grating 105h, face of cylinder 105i, therefore, during moulding Between can shorten, can further reduce the manufacturing cost of composite optical component 105.
And, in shell 106, comprising beam shaping parts 109, therefore, can subtract Shine less the waste of the laser power on the CD, look and can be suitable for for example digitlization Frequency optical disc apparatus etc. needs the light picker of the optical disc apparatus of bigger laser power.
And, in beam shaping parts 109, form: the 109a of beam shaping section, from The outwardly directed discoid flange part 109b of the 109a of this beam shaping section, be formed on this Restriction protuberance 109c on the flange part 109b, on the inner surface of shell 106, shape Become to contact stage portion 106m and the above-mentioned restriction of insertion of the end face of above-mentioned flange part 109b The position limitation ditch 106d of protuberance 109c uses above-mentioned stage portion 106m and above-mentioned The end face of flange part 109b consists of first restraint device, simultaneously, uses above-mentioned position Restriction ditch 106d and above-mentioned restriction protuberance 109c consist of second restraint device, because of This, is only by beam shaping parts 109 are pressed in the shell 106, just can be automatically complete Become the stance adjustment of 109 pairs of laser beam axis of beam shaping parts, when dress in shell 106 During luminous intensity distribution bundle orthopaedic component 109, do not need the anchor clamps of special position adjustment usefulness, because of This can simplify the dress of the composite optical unit 101 that comprises beam shaping parts 109 Join, simultaneously, can not make the dress that acts between shell 106 and the beam shaping parts 109 Join power and be applied on the 109a of beam shaping section, and can prevent the 109a's of beam shaping section Therefore distortion and displacement, can improve the complex optics that comprises beam shaping parts 109 The optical characteristics of unit 101.
And the composite optical unit that present embodiment is related uses in beam shaping section The cylindrical lens that forms among the 109a is as beam shaping parts 109, and arranged coaxial should circle The central shaft of cylindrical lens and from the emitted laser of two long wavelength laser diodes 102 Optical axis, with respect to the lens face of cylindrical lens, vertical incidence laser is so that carried out The laser of beam shaping penetrates from the central axis direction of cylindrical lens, therefore, and just can be not Must increase the radial dimension of shell 106, and at the shell 106 interior beam shaping parts that arrange 109, can consist of compactly the composite optical unit that comprises beam shaping parts 109.
Below, according to Figure 16 and Figure 17 complex optics list involved in the present invention is described Second embodiment of unit. Figure 16 is the related composite optical unit of second embodiment 101 Sectional drawing, Figure 17 is in the related composite optical unit 101 of second embodiment The major part amplification profile diagram of included beam shaping parts 109.
Such as Figure 16 and shown in Figure 17, the feature of the composite optical unit 101 of present embodiment Be: in the 109a of beam shaping section, comprise the beam shaping section that forms triangular prism Part 109. The 109a of beam shaping section (triangular prism), as shown in figure 17, the entering of laser beam Penetrate face 109a ' and be formed on the inclined plane that tilts with respect to central shaft N ' outgoing of laser Face 109a " be formed on respect on the vertical plane of central shaft N ', so that swash from two wavelength The minor axis direction of the laser that optical diode 102 is emitted is towards the inclination of plane of incidence 109a ' Direction and carry out incident thus, can be from exit facet 109a " emitted laser The point shape is shaped as circle. That is, as described above, because from two long wavelength laser diodes The point of 102 emitted laser is shaped as ellipse, then by make its minor axis direction towards The incline direction of plane of incidence 109a ' carries out incident, and has enlarged the minor axis direction of laser, And can be shaped as circle to the some shape of laser.
Plane of incidence 109a ' is with respect to exit facet 109a " tilt angle theta, be the refractive index of m and the resin material that consists of composite optical component 105 when being n at the light beam amplification degree, can obtain with following formula:
θ＝sin -1{(m 2-1)/(n 2m 2-1)}
From this formula, as an example, work as m=2.5, during n=1.5, θ=39.3.
The shell 106 that this routine composite optical unit 101 is related, as shown in figure 16, With respect to the stage portion 106m and the complex light department of the Chinese Academy of Sciences that are used for setting beam shaping parts 109 The accommodating chamber 106c of part 105, the accommodating chamber 106a of two long wavelength laser diodes 102 inclines Tiltedly arrange, in accommodating chamber 106a, insert the cap section of two long wavelength laser diodes 102 102e, the matrix part of embedding two long wavelength laser diodes 102 in the 106b of installation pit hole 102a thus, can make from the emitted laser of two long wavelength laser diodes 102 relative In the plane of incidence 109a ' of the 109a of beam shaping section to obtain needed beam shaping effect Needed incident angle carry out incident.
For other parts, because the composite optical unit related with first embodiment 101 is identical with beam shaping parts 109, therefore, uses identical to corresponding part Label and the description thereof will be omitted.
This routine composite optical unit 101 is related except having with first embodiment Outside the identical effect of composite optical unit 101, use in the 109a of beam shaping section Formed triangular prism is used as beam shaping parts 109, with respect to this triangular prism The plane of incidence, tilted configuration is from the light of the emitted laser of two long wavelength laser diodes 102 Axle, with respect to the plane of incidence of triangular prism, the above-mentioned laser of incident obliquely is so that shaping After laser penetrate at the central axis direction of above-mentioned shell 106, therefore, can make shell The installation portion of two long wavelength laser diodes 102 in 106 is with respect to the light in the shell 106 The installation portion of bundle orthopaedic component 109 and the installation portion of composite optical component 105 tilt, Can simplify two long wavelength laser diodes 102 to the installation of needed installation portion.
In addition, in the above-described embodiments, use to have two different light sources of wavelength 103a, two long wavelength laser diodes 102 of 103b be as luminous component, still, and also Can use the luminous component that only comprises a light source, also can use to have the wavelength difference The luminous component of the light source more than 3.
And, in above-mentioned first embodiment, in the 109a of beam shaping section, use circle Cylindrical lens is as beam shaping parts 109, in above-mentioned second embodiment, at light beam Use triangular prism as beam shaping parts 109 among the 109a of shaping section, replace above-mentioned Consist of, can be in the 109a of beam shaping section setting example such as circular diffraction grating etc. other Light-beam forming unit.
Figure with Figure 18～Figure 20 and first embodiment illustrates of the present invention below The 3rd embodiment.
Figure 18 is that the light of the composite optical unit that comprises that the 3rd embodiment is related picks up dress Put 100 pie graph, Figure 19 is the related composite optical component of the 3rd embodiment 105 Front view, Figure 20 is the schematic diagram of function for explanation composite optical component 105.
As shown in figure 18, optical take-up apparatus 100 mainly is made of following part: pick up The device body is carrier 500, be configured in composite optical unit 101 in this carrier 500, Flat speculum 300, collimation lens 400, object lens 200. At the complex optics list Comprise composite optical component 105 in the unit 101.
Optical take-up apparatus 100 is faced CD for example compact disc 61 or digitized video CD 62 and disposing, as with the dish of compact disc 61 (Digital video disc 62) The surface quadrature direction focusing (F) direction and as compact disc 61 (digitized videos Movable support mirror 200 on the tracking of radial direction CD 62) (T) direction. And, Object lens 200 constitute and can be adapted to 62 pairs of compact disc 61 and Digital video discs The side.
Composite optical unit 101 is so luminous one-piece type optics elements of sensitization: swashing Illumination is mapped on the CD, by receiving the reverberation (back light) from CD, resets Be recorded in the information on the CD, perhaps, recorded information on the CD. As shown in Figure 1, It mainly is made of following part: as two long wavelength laser diodes of luminous component 102, the built-in photosensitive-member 104 of photo-sensitive cell 104a, composite optical component 105, The shell 106 that printed circuit board (PCB) 107, these parts install and fix.
Two long wavelength laser diodes 102, identical with first embodiment, as shown in Figure 2, Formed by following part: discoideus matrix part 102a, from the side of matrix part 102a The outstanding square bodily form that arranges of planar portions 102a ' base station 102b, locate and be fixed on Chip of laser 103 on the sidewall surfaces of base station 102b, be fixed on planar portions 102a ' upper body 102c and the sky plate 102d group that forms peristome 102d ' by tubular One-tenth with the 102e of cap section that contains base station 102b, be fixed into from the inboard of the 102e of cap section and stop up The transparent discoideus glass plate 102f of peristome 102d '. Has matrix part 102a, the 102e of cap section and glass plate 102f and configuration laser in the airtight space that consists of Device chip 103. In this chip of laser 103, separate small interval D and form: Short wavelength's's (wavelength 650nm band) that the ejaculation Digital video disc is used laser 103a's ' Long wavelength's's (wavelength 780nm band) that light source 103a and ejaculation compact disc are used laser The light source 103b of 103b '. And, in the present embodiment, interval D is set at 120 μ m. And the 650nm band that Digital video disc is used specifically, adopts 635nm or 650nm are as the Digital video disc standard.
And from light source 103a, laser 103a ', the 103b ' that 103b penetrates respectively is logical Cross peristome 102d ' and penetrate so that with the side's of matrix part 102a planar portions Become on the direction of 102a ' quadrature and to be parallel to each other. And, laser 103a ', 103b ' The ejaculation position top end surface 103 ' that becomes chip of laser 103 (be configured to and the plane The 102a ' of section parallels) same plane on. And, from the side of matrix part 102a The opposing party's the planar portions of planar portions 102a ' opposite side outstanding are set a plurality of outside connections Terminal 102g (with reference to Figure 18), 102g carries out to laser by this external connection terminals The power supply of the drive current of device chip 103.
And, in the operation of making two long wavelength laser diodes 102, comprise two light The chip of laser 103 of source 103a, 103b on predetermined substrate surface by with half Conductor is processed similar processing and is processed, therefore, and each light source 103a, 103b Between interval D can easily become predetermined value with the high accuracy adequate relief. Therefore, As discrete parts, can produce in a large number, therefore, two long wavelength laser diodes 102 cost can be cheap.
Photosensitive-member 104, as shown in figure 18, built-in photo-sensitive cell 104a, and by The photosurface side of this photo-sensitive cell 104a arrange sensitization window 104b ' assembly 104b and Consist of from the outstanding external connection terminals 104c that is set to both sides of assembly 104b, by External connection terminals 104c carry out to the supply voltage of photo-sensitive cell 104a provide and By the output to the outside of the signal of photo-sensitive cell 104a institute light-to-current inversion.
Composite optical component 105 shown in Figure 19, identical with first embodiment, by thoroughly The formed body of the resin material that lightness is higher forms, and is parallel by the both ends of the surface of optical axis N direction Ground formed slightly cone shape matrix part 105c, from above-mentioned two long wavelength laser diodes The plane of incidence 105a of 102 emitted laser, from above-mentioned two long wavelength laser diodes The exit facet 105b that 102 emitted laser penetrate towards CD, returning from CD The reflecting surface 105d that light echo is transmitted on the above-mentioned photo-sensitive cell 104a forms. And And, the composite optical component 105 that present embodiment is related, from the back light of CD Plane of incidence dual-purpose is above-mentioned exit facet 105b, injects above-mentionedly to go out from the back light of CD Penetrate face 105b.
Plane of incidence 105a forms columniform concave surface, the curvature of exit facet 105b with enter Penetrate face 105a difference, and form: the central axis direction of curved surface is configured to and incident The columniform convex surface that face 105a parallels. These planes of incidence 105a and exit facet 105b Curvature, the minor axis direction from the emitted laser of two long wavelength laser diodes 102 When injecting the center of plane of incidence 105a towards the central axis direction of this plane of incidence 105a, quilt Be adjusted to make become from the some shape of the emitted laser of exit facet 105b circular. Example As, when the distance of the both ends of the surface of composite optical component 105 is 4mm, by make into It is 2.6 concave surface that the face 105a of penetrating becomes focal length, makes exit facet 105b become focus Distance is 6.6 convex surface, just can be emitted from above-mentioned two long wavelength laser diodes 102 The some shape of laser be shaped as circle. That is, because from two long wavelength laser diodes 102 The point of emitted laser is shaped as oval-shaped, then by making its minor axis direction towards entering The central axis direction of penetrating face 105a comes incident, just can with at plane of incidence 105a and exit facet The laser light incident side of the composite optical component that 105b forms abreast or exiting side configuration The situation of cylindrical lens identical, the point from the emitted laser of exit facet 105b Shape is shaped as circular.
And, shown in Figure 4 such as first embodiment, on above-mentioned plane of incidence 105a, Make from the emitted laser diffraction of two long wavelength laser diodes 102, be formed for generating and shine Penetrate on compact disc tracking control with and the three beams of the three beams used of data playback give birth to Become to use diffraction grating 105h.
As shown in Figure 5, the central portion at exit facet 105b is formed for handle from CD Back light be transmitted to the first square diffraction grating 105f on the reflecting surface 105d.
Reflecting surface 105d becomes to tilt with respect to the both ends of the surface of composite optical component 105 The inclined plane on the surface of this reflecting surface 105d, as shown in Figure 4, is formed for the school The second diffraction grating 105g of the reflection-type in the path of positive back light. By this reflecting surface Passing through on the path of the back light that 105d reflects, flat surfaces 105n strides across matrix part The side face of 105c and forming. And, as shown in Figure 6, from this flat surfaces 105n's Edge part is for the face of cylinder 105i shape of the focus control of carrying out being undertaken by method of astigmatism Become the ditch shape that becomes predetermined angle with optical axis N, the inwall of this face of cylinder 105i Become back light exit facet 105p.
And, in the related composite optical component 105 of present embodiment, above-mentioned first Diffraction grating 105f, the second diffraction grating 105g and three beams diffraction grating 105h With above-mentioned plane of incidence 105a, exit facet 105b, matrix part 105c, reflecting surface 105d Use together mould with face of cylinder 105i and one-body molded. For these diffraction lights The function of grid 105f, 105g, 105h is described in detail in the back.
Matrix part 105c forms: from plane of incidence 105a to exit facet 105b side diameter The virtually conical shape that diminishes successively is in the leading section formation cylindrical portion of this matrix part 105c 105j, its face of cylinder 105j ' become the first restriction section to shell 106.
As shown in Figure 4, the rear end side at this matrix part 105c is plane of incidence 105a and anti-Penetrate on the outer peripheral face of forming portion side of face 105d, have 4 of half-terete outer surface Individual protuberance 105k ' is at circumferentially approximate equality ground configuration, the post of these protuberances 105k ' The shape face becomes the second restriction section to shell 106. And, this matrix part 105c's Rear end face (comprises one of the part of above-mentioned plane of incidence 105a and above-mentioned reflecting surface 105d Part) on, such as Fig. 4 and shown in Figure 14, relative with above-mentioned each protuberance 105k ' Part, be formed for cushioning 105 pairs of shells of composite optical component so that desired depth is recessed The spatial portion 105s of 106 pressing-in force.
And, as shown in figure 19, at the central portion of matrix part 105c, give prominence to shape downwards Become columned position limitation protuberance 105m.
And the composite optical component 105 of present embodiment is exit facet 105b and returning The light echo plane of incidence still, also can arrange respectively exit facet and return as same plane Light entrance face forms first diffraction grating at this back light plane of incidence.
The piece that Fig. 9～shell 106 shown in Figure 13 is made by the aluminum dipping form casting forms, and is main By tubular body 106g, respectively outwards square from the both ends of this tubular body 106g The outstanding installation portion 106h that arranges, 106i forms. At these installation portions 106h, 106i Upper square installed surface 106h ', the 106i ' of forming respectively.
As shown in figure 10, the inner surface in the left part of tubular body 106g forms Be used for holding the accommodating chamber 106a of two long wavelength laser diodes 102 shown in Figure 2, connect It, recessedly on the left side be formed for the location and two long wavelength laser diodes are installed 102 installation pit hole 106b. On the other hand, in the right part of tubular body 106g Inner surface on, be formed for holding the appearance of the composite optical component 105 shown in the soil 19 Receive chamber 106c, form respectively to insert in its both end sides and be formed on above-mentioned composite optical component The first restriction receiving portion 106j and slotting of the first restriction section (face of cylinder 105j ') on 105 Enter to be formed on the second restriction section (protuberance 105k ') on the above-mentioned composite optical component 105 The second restriction receiving portion 106k. These each accommodating chambers 106a, 106c with respect in Axle N ' forms with one heart.
Form like this for the accommodating chamber 106c that holds above-mentioned composite optical component 105 Conical surface-shaped: the accommodation section 106k that is used for holding above-mentioned two long wavelength laser diodes 102 The diameter of side is bigger, extends to installed surface 106i ' side and reduces successively diameter. And, The diameter of the first restriction receiving portion 106j is set to such size: can high accuracy The cylindrical portion 105j (diameter D1) of the chimeric composite optical component 105 in ground (with reference to Figure 19), The diameter of the second restriction receiving portion 106k is set to such preliminary dimension: outside being shorter than Be connected in each protuberance 105k ' on the rearward end 105k of composite optical component 105 The external diameter of a circle D2 (with reference to Fig. 4) on top.
Leading section at above-mentioned accommodating chamber 106c is formed for deciding in central shaft N ' direction The location division of position composite optical component 105 namely contacts face 106c '. Contact face 106c ' at this On offer circular peristome 106f so that be located at first on the composite optical component 105 Diffraction grating 105f exposes from the place ahead.
And, on above-mentioned tubular body 106g, such as Figure 10 and shown in Figure 13, Be formed on above-mentioned accommodating chamber 106a, the position limitation ditch of the U font that connects among the 106c 106d is connected with rear end with this position limitation ditch 106d and at above-mentioned accommodating chamber 106a The fan-shaped guiding ditch 106d ' that connects of rear end. The furrow width of above-mentioned position limitation ditch 106d Degree is set to so predetermined size: outstanding being arranged on the composite optical component 105 The external diameter of position limitation protuberance 105m can be accurately chimeric. And, connecing The part of the above-mentioned position limitation ditch 106d of nearly this accommodation section 106g is formed for the configuration sense The configuration plane 106e of light parts 104. This configuration plane 106e, as shown in figure 18, when Above-mentioned installation portion 106h, the installed surface 106h ' of 106i, the upper installation of 106i ' is electrically connected sensitization During the printed circuit board (PCB) 107 of parts 104, at above-mentioned each installed surface 106h ', 106i ' Between form needed step so that photosensitive-member 104 can not affect shell 106.
And the piece that is used for shell 106 not only can be made of aluminum die cast, also can Consisted of by zinc die casting, magnesium alloy or other metal etc.
Below, come two long wavelength laser diodes 102, photosensitive-member 104 with reference to Figure 18 Describe with the installation method of composite optical component 105 to shell 106.
Position limitation protuberance 105m be formed on guiding ditch on the shell 106 Under the state of the peristome alignment of 106d ', from the installation pit hole 106b insertion of shell 106 Composite optical component 105, with not shown needed anchor clamps, compress equably remove into Penetrate the outer surface of diffraction grating 105h of face 105a, thus, this matrix part 105c embedding Enter in the accommodating chamber 106c. Then, touch in the outer edge of exit facet 105b and be formed on In the stage of the face that contacts 106c ' among the accommodating chamber 106c of shell 106, finish central shaft N ' direction is to the location of shell 106.
At this moment, the cylindrical portion 105j that is located on the matrix part 105c is entrenched in accommodating chamber On the first restriction receiving portion 106j of 106c, therefore, the cylindrical portion of matrix part 105c The face of cylinder 105j ' of 105j (restriction face is with reference to Figure 19) touches the first restriction receiving portion On the 106j, with the position of the direction of optical axis N quadrature in the leading section of matrix part 105c Restriction is finished accurately. And, meanwhile, the rearward end of matrix part 105c 105k is pressed into and is located at the restriction of second on accommodating chamber 106c receiving portion 106k. At this moment, As shown in figure 14, be formed on each protuberance 105k ' on the outer peripheral face of rearward end 105k Become respectively the state of even compression, the top end face (restriction face) of each protuberance 105k ' Contact with the second restriction receiving portion 106k, with the rearward end 105k of matrix part 105c In the position limitation of direction of central shaft N ' quadrature finished accurately, simultaneously, Prevented the disengaging of composite optical component 105 from accommodating chamber 106c. And, by handle Composite optical component 105 embeds the installation pit hole 106b that is located on the shell 106, forms Position limitation protuberance 105m on composite optical component 105 is directed to and is formed on Among the guiding ditch 106d ' in the shell 106, be embedded into position limitation ditch 106d, therefore, Position limitation around the direction of rotation of central shaft N ' is finished accurately.
Like this, the composite optical unit 101 of present embodiment not only can be complex optics Parts 105 embed shell 106, and can carry out 105 pairs of shells of composite optical component The position limitation of 106 central shaft N ' direction, with the position of the direction of central shaft N ' quadrature Put restriction, around the position limitation of the direction of rotation of central shaft N ', therefore, can be easy And carry out accurately the assembling of composite optical unit 101. And, present embodiment Composite optical unit 101, with composite optical component 105 in protuberance 105k ' The recessed formation spatial portion of the part 105s that forming portion is corresponding, therefore, when outstanding each The 105k of section, top end face (restriction face) touched the second restriction receiving portion 106k when upper, each The forming portion of individual protuberance 105k ' is in spatial portion 105s side strain, thus, and its pressure Enter power and relaxed, can prevent from surpassing necessary pressing-in force and be applied to composite optical component On 105, can prevent the distortion of optical function section, particularly the second diffraction grating 105g With the distortion of three beams with diffraction grating 105h.
Two long wavelength laser diodes 102 insert shell to the 102e of its cap section (with reference to Fig. 2) In 106 the accommodating chamber 106a, matrix part 102a embedding is formed on peace on the shell 106 Among the hole 106b of dress hole, thus, be fixed on the shell 106. Thus, as shown in figure 20, Can make from the optical axis N of the emitted laser of two long wavelength laser diodes 102 automatically with The central shaft N ' of shell 106 aligns, and can make from two long wavelength laser diodes 102 Emitted laser is injected into the center of the plane of incidence 105a of composite optical component 105 On, therefore, can be shaped as circle to the some shape of laser.
Photosensitive-member 104 is such as Figure 18 and shown in Figure 20, by printed circuit board (PCB) 107 Be installed on the shell 106. The installation of 104 pairs of printed circuit board (PCB)s 107 of this photosensitive-member this Sample carries out: the sensitization window 104b ' side of handle component 104b is passed and is located at printed circuit board (PCB) 107 On through hole 107a, external connection terminals 104c is clamped to is formed on printed circuit board (PCB) On the 107 lip-deep clamping parts (not shown). And, can be as required, with bonding Agent handle component 104b is firm to be bonded on printed circuit board (PCB) 107 or the shell 106. And And fixedly the printed circuit board (PCB) 107 of photosensitive-member 104 is being configured to sensitization window 104b ' Under the state relative with position limitation ditch 106d on being formed on shell 106, carried At installation portion 106h, each installed surface 106h ' of 106i is on the 106i ', with bolt 108 Carry out spiral and fix, and be fixed on the shell 106. And, carry photosensitive-member 104 Printed circuit board (PCB) 107, when by predetermined benchmark optical system from light source 103a, The laser 103a ' that 103b is emitted, the corresponding back light from CD of 103b ' in advance When carrying out diffraction by the first diffraction grating 105f and the second diffraction grating 105g, be adjusted into The most suitably be directed on the precalculated position P of photo-sensitive cell 104a, then, be fixed on Installed surface 106h ' is on the 106i '.
Digital video disc 62 and the densification below optical take-up apparatus 100 carried out The playback action of CD 61 describes.
In the above-described configuration, when playback Digital video disc 62, as shown in figure 18, The laser 103a ' that penetrates from the light source 103a of two long wavelength laser diodes 102 sees through and forms Three beams on the plane of incidence 105a of composite optical component 105 with diffraction grating 105h and Be transformed to three beams, then, see through the first diffraction grating 105f, 105b penetrates from exit facet Go out.
Then, this laser 103a ' is by being configured to become with the direct of travel of laser 103a ' The speculums 300 of 45 degree and make its angle deflection 90 degree, and inject and be configured in speculum In the parallel light tube lens 400 of 300 top. Then, by these parallel light tube lens 400 and the laser 103a ' that becomes almost parallel light injects object lens 200. By object lens 200 The optically focused effect, be imaged on the information recording surface of Digital video disc 62.
Then, the laser that is reflected by Digital video disc 62 (back light) 103a ' again The inferior object lens 200 that see through, and see through parallel light tube lens 400, anti-by 300 of speculums Penetrate, then, inject and be formed on the back light plane of incidence shown in Figure 180 and namely be formed on outgoing The first diffraction grating 105f on the face 105b becomes and is diffracted into predetermined angle of diffraction The back light 103a '-2 of a diffraction light. Back light 103a '-2 then is formed on Back light reflecting surface 105d on the composite optical component 105 reflects, and incides circle Among the cylinder 105i, penetrate from back light exit facet 105p. And, the back light of ejaculation 103a ,-2 by position limitation ditch 106d (with reference to Figure 10, Figure 13), and incides sense On the photosensitive sites P among the photo-sensitive cell 104a of light parts 104.
At this moment, the back light 103a '-2 that is accepted by photo-sensitive cell 104a is carried out light The electricity conversion, thus, by the letter of handle with the information recording surface of Digital video disc 62 Number corresponding electric current output transform is that voltage signal generates replay signal, from photographic department The external connection terminals 104b of part 104 is output, and passes by printed circuit board (PCB) 107 Lead the outside. And, the back light 103a's '-2 that is accepted by photo-sensitive cell 104a A part is used to focus on and follow the tracks of control.
On the other hand, when playback compact disc 61, from two long wavelength laser diodes 102 The laser 103b ' that penetrates of light source 103b, as shown in figure 18, see through be formed on compound Three beams on the plane of incidence 105a of optics 105 is transformed to diffraction grating 105h Three beams then, sees through the first diffraction grating 105f, penetrates from exit facet 105b. Connect This laser 103b ' identical object lens that are transmitted to during with Digital video disc 62 200, by the optically focused effect of object lens 200, be imaged on the information recording/of compact disc 61 On the face.
Then, the back light 103b ' that is reflected by compact disc 61 sees through object lens again 200, the parallel light tube lens 400, and reflected by speculum 300, then, inject The first diffraction grating 105f becomes a diffraction light being diffracted into predetermined angle of diffraction Back light 103b '-2. Back light 103b '-2 then is formed on composite optical component Back light reflecting surface 105d on 105 " reflect, inject face of cylinder 105i. At cylinder Among the face 105i, back light 103b '-2 is provided for the method for astigmatism of focus control, penetrates Back light exit facet 105p, and by position limitation ditch 106d (with reference to Figure 10, Figure 13), And accepted by the photosensitive sites P among the photo-sensitive cell 104a. At this moment, by photo-sensitive cell The back light 103b '-2 that 104a accepts is carried out light-to-current inversion, thus, and by handle The electric current output transform corresponding with the signal of the information recording surface of compact disc 61 is electricity Press signal, and form replay signal, from the external connection terminals 104b of photosensitive-member 104 Be output, by printed circuit board (PCB) 107, be transmitted to the outside. And, by photo-sensitive cell The part of the back light 103b '-2 that 104a accepts is used to that method of astigmatism carries out The tracking control that focus control and three beams are carried out.
And, in optical take-up apparatus 100, can be at exit facet 105b and object lens 200 Between light path in the laser 103a ' that restriction is penetrated from composite optical component 105 is set, The wavelength optical filtering of the diameter of the light beam of 103b ' etc.
Below to comprise in the composite optical component 105 each diffraction grating 105f, 105g, The function of 105h describes.
As shown in figure 20, with penetrate from the exit facet 105b of composite optical component 105 Laser 103a ', 103b ' corresponding respectively from Digital video disc 62 and densification The back light of CD 61 is respectively by first diffraction grating that is formed on the exit facet 105b 105f institute diffraction, and become back light 103a '-2 and back light 103b '-2. At this moment, Because the wavelength corresponding to the back light 103b '-2 of compact disc 61 is longer than corresponding to number The wavelength of the back light 103a '-2 of word video disc 62, therefore, back light 103b '-2 angle of diffraction (is utilized such greater than the angle of diffraction of back light 103a '-2 Principle: in diffraction grating, wavelength is more long, and angle of diffraction is more big).
And, utilize the poor of this angle of diffraction, make before diffracted laser 103a ', 103b ' light axle base separately is the state of D, as back light 103a '-2, return Light 103b '-2 arrives back light reflecting surface 105d " time, both in-position phases one Cause.
But, at the back light reflecting surface 105d of composite optical component 105 " in, returning Light echo 103a '-2, back light 103b '-2 reflect simply, because both sides' laser The incidence angle difference, just can not make two back light 103a '-2, back light 103b '-2 Consistently towards the photosensitive sites P of photo-sensitive cell 104a. In order to proofread and correct it, returning Light echo reflecting surface 105d " on the second diffraction grating 105g is set. That is, utilize and to incide the Back light 103a '-2 among the two diffraction grating 105g and back light 103b '-2 again by The angle of diffraction that the wavelength difference produces poor makes by back light reflecting surface 105d " anti-The back light 103a '-2 that penetrates and back light 103b '-2 both sides' optical axis are consistent.
Like this, can be the back light by first diffraction grating 105f difference institute diffraction 103a ,-2 and back light 103b '-2 proofread and correct to all by the sensitization position of photo-sensitive cell 104a Put P and accept, even use light source 103a, the 103b of 2 wavelength, also can be with having The photosensitive-member 104 of a photo-sensitive cell 104a is accepted both sides' laser.
As described above, according to present embodiment, as shown in figure 18, has the light of being installed in Shell 106 on the pick device 100 installs and fixes two wavelength lasers in shell 106 Diode 102 and photosensitive-member 104 and composite optical component 105, two wavelength lasers Diode 102 has the laser two of the short wavelength laser used of emission Digital video disc The long wavelength laser diode 103b that utmost point pipe 103a and emission compact disc are used, complex light Member 105 is provided with: the entering of the light incident of penetrating from two long wavelength laser diodes 102 Penetrate the exit facet 105b of face 105a and ejaculation, to by the light that is located on the exit facet 105b The back light that reflects of dish D1 (D2) carry out diffraction the first diffraction grating 105f, by The back light of the first diffraction grating 105f institute diffraction reflexes to anti-on the photosensitive-member 104 Penetrate face 105d, on reflecting surface 105d, also be provided with the light that makes the different light of wavelength simultaneously Axle is consistent and be imaged onto second diffraction grating on the photosensitive sites P of photosensitive-member 104 Therefore 105g, can be suitable for using two not by enough composite optical units 101 The optical take-up apparatus 100 of co-wavelength. And photosensitive-member 104 can be one, energy Enough this photosensitive-members 104 of only adjusting carry out the position cooperation, therefore, can not make and adjust the worker Cost in the order increases. And, make from 102 emitted the swashing of two long wavelength laser diodes The exit facet 105b of light and incident are in from the back light plane of incidence of the back light of CD On the same level, therefore, put from this, can simplify formation.
And two long wavelength laser diodes 102 are by matrix part 102a, by the 102e of cap section The assembly that is connected with glass plate 102f, connect from the outstanding outside that arranges of matrix part 102a Terminal 102g consists of, and photosensitive-member 104 is by the built-in group of photo-sensitive cell 104a Part 104b and be located at the institute that the external connection terminals 104c on this assembly 104b consists of The meaning discrete parts is with consisting of the complex optics list with the cheap parts of making of monomer respectively Unit 101, therefore, the processing of each parts becomes easily, and, to the dress of shell 106 Join operation and become easily, can reduce component costs and processing charges.
And, form composite optical component 105 with cheap resin material, simultaneously, When composite optical component 105 moulding, integrally formed first and second diffraction grating of while 105f, 105g, three beams diffraction grating 105h, face of cylinder 105i, therefore, during moulding Between can shorten, can further reduce the manufacturing cost of composite optical component 105.
And, owing in composite optical component 105, comprise integratedly the beam shaping dress Put, therefore, can reduce the waste that shines the laser power on the CD, and can fit Close in the CD dress such as the bigger laser power of the needs such as Digital video disc device The light picker of putting. And, light-beam forming unit and from two long wavelength laser diodes The plane of incidence 105a of 102 emitted laser, penetrate from two long wavelength laser diodes 102 Emitted laser and incident from the exit facet 105b of the back light of CD, from The reflecting surface that the back light of CD is transmitted on the photosensitive-member forms, therefore, and no Need mutually adjusting of various piece, can seek miniaturization and the dress of composite optical unit The summary of joining. And, the plane of incidence 105a of composite optical component 105 is formed Columniform concave surface simultaneously, makes the exit facet 105b shape of this composite optical component 105 Become the curvature columniform convex surface different from above-mentioned plane of incidence 105a, thus, give multiple Close optics 105 light-beam forming unit is provided, therefore, can be easy and cheap Ground is implemented to make and design.
Below, according to Figure 21 of composite optical unit involved in the present invention is described Four embodiment.
As shown in figure 21, this routine composite optical component 105, plane of incidence 105a forms Be the inclined plane that the optical axis N with respect to laser tilts, exit facet 105b forms relatively On the vertical plane of central shaft N ', so that penetrate from two long wavelength laser diodes 102 The minor axis direction of the laser that goes out is towards the incline direction of plane of incidence 105a and carry out incident, Thus, can be shaped as circle to the some shape from the emitted laser of exit facet 105b Shape. That is, as described above, because from 102 emitted the swashing of two long wavelength laser diodes The point of light is shaped as ellipse, then by making its minor axis direction towards plane of incidence 105a's Incline direction carries out incident, thus, and parallels institute at the plane of incidence with exit facet 105b The laser light incident side configuration triangular prism of the composite optical component that forms tilts laser Situation about inciding in this triangular prism identical, can be penetrating from exit facet 105b The some shape of laser be shaped as circle.
Plane of incidence 105a is with respect to the tilt angle theta of exit facet 105b, is m and the refractive index that consists of the resin material of composite optical component 105 when being n at the light beam amplification degree, can obtain with following formula:
θ＝sin -1{(m 2-1)/(n 2m 2-1)}
From this formula, as an example, work as m=2.5, during n=1.5, θ=39.3.
The shell 106 that this routine composite optical unit 101 is related, as shown in figure 21, With respect to the accommodating chamber 106c of composite optical component 105, two long wavelength laser diodes 102 Accommodating chamber 106a be obliquely installed, in accommodating chamber 106a, insert two wavelength lasers, two utmost points The 102e of cap section of pipe 102 embeds two long wavelength laser diodes in the 106b of installation pit hole 102 matrix part 102a thus, can make from two long wavelength laser diodes 102 and penetrate The laser that goes out is with respect to the plane of incidence 105a of composite optical component 105, and is required to obtain The needed incident angle of the beam shaping effect of wanting carries out incident.
For other parts, because the composite optical unit related with the 3rd embodiment 101 is identical with composite optical component 105, therefore, uses identical to corresponding part Label and the description thereof will be omitted.
This routine composite optical unit 101 and composite optical component 105 are except having and The related composite optical unit 101 of three embodiment is identical with composite optical component 105 Outside the effect, as the beam shaping parts, make the plane of incidence of composite optical component 105 105a is with respect to the incident direction from the emitted laser of two long wavelength laser diodes 102 Tilt, therefore, Design and manufacture is easy, can easily make to have high-precision light The composite optical component 105 of bundle shaping feature.
In addition, in the above-described embodiments, use to have two different light sources of wavelength 103a, two long wavelength laser diodes 102 of 103b be as luminous component, still, and also Can use the luminous component that only comprises a light source, also can use to have the wavelength difference The luminous component of the light source more than 3.

Claims (10)

1. composite optical unit, it is characterized in that, be provided with in the enclosure: composite optical component, luminous component, photosensitive-member, be used for the some shape from the emitted laser of above-mentioned luminous component is shaped as circular light-beam forming unit, above-mentioned composite optical component makes at least from the plane of incidence of the emitted laser of above-mentioned luminous component, the exit facet that the laser of injecting the above-mentioned plane of incidence is penetrated towards CD, make the back light plane of incidence from the back light incident of above-mentioned CD, be formed on the above-mentioned back light plane of incidence and make the diffraction instrument of above-mentioned back light to the predetermined direction diffraction, the reflecting surface that back light by above-mentioned diffraction instrument institute diffraction is transmitted to above-mentioned photosensitive-member is provided with integratedly.
2. composite optical unit according to claim 1, it is characterized in that, above-mentioned composite optical component and above-mentioned light-beam forming unit dispose individually, above-mentioned light-beam forming unit is made up of the beam shaping parts, is provided with between the inside surface of above-mentioned shell and above-mentioned beam shaping parts: be used to limit above-mentioned beam shaping parts with respect to first restraint device from the angle of inclination of the optical axis of the emitted laser of above-mentioned luminous component; Be used to limit above-mentioned beam shaping parts with respect to second restraint device from the sense of rotation position of the optical axis of the emitted laser of above-mentioned luminous component.
3. composite optical unit according to claim 2, it is characterized in that, in above-mentioned beam shaping parts, form beam shaping portion and reach flange part that stretches out and the restriction teat that is formed on this flange part from its beam shaping portion, on the inside surface of above-mentioned shell, form the stage portion and the restriction ditch that inserts above-mentioned restriction teat of the end face of the above-mentioned flange part of contact, when the end face with above-mentioned stage portion and above-mentioned flange part constitutes above-mentioned first restraint device, constitute above-mentioned second restraint device with above-mentioned restriction ditch and above-mentioned restriction teat.
4. composite optical unit according to claim 3, it is characterized in that, as above-mentioned beam shaping parts, use forms cylindrical lens in above-mentioned beam shaping portion, dispose the central shaft of this cylindrical lens coaxially and from the optical axis of the emitted laser of above-mentioned luminous component, lens face with respect to above-mentioned cylindrical lens is vertically injected above-mentioned laser, penetrates by the laser of beam shaping on the central axis direction of above-mentioned cylindrical lens.
5. composite optical unit according to claim 3, it is characterized in that, as above-mentioned beam shaping parts, use forms triangular prism in above-mentioned beam shaping portion, the plane of incidence with respect to this triangular prism, dispose obliquely from the optical axis of the emitted laser of above-mentioned luminous component, inject above-mentioned laser obliquely, on the central axis direction of above-mentioned shell, penetrate by the laser of beam shaping with respect to the plane of incidence of above-mentioned triangular prism.
6. composite optical unit according to claim 3 is characterized in that, pressure welding equally spaced is set on the outer peripheral face of above-mentioned shell fixedly uses projection at least 3 of the inside surface of above-mentioned shell.
7. composite optical component according to claim 1 is characterized in that, on this composite optical component, forms above-mentioned light-beam forming unit.
8. composite optical component according to claim 7 is characterized in that, as above-mentioned light-beam forming unit, forms on columniform concave surface in the above-mentioned plane of incidence, forms above-mentioned exit facet on the columniform convex surface different with the curvature of the above-mentioned plane of incidence.
9. composite optical component according to claim 7 is characterized in that, as above-mentioned light-beam forming unit, the incident direction of the above-mentioned plane of incidence laser emitted with respect to above-mentioned luminous component is tilted.
10. composite optical component according to claim 7 is characterized in that, is provided with the light diffraction device that the laser that above-mentioned luminous component is emitted is divided into a plurality of light beams on the above-mentioned plane of incidence.
CNB011198680A 2000-07-04 2001-07-03 Composite optical component and composite optical unit thereof Expired - Fee Related CN1177320C (en)

Applications Claiming Priority (6)

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JP2000202389A JP2002025100A (en) 2000-07-04 2000-07-04 Complex optical member and complex optical unit provided with the same
JP202389/00 2000-07-04
JP202389/2000 2000-07-04
JP2000214879A JP2002032930A (en) 2000-07-14 2000-07-14 Composite optical unit
JP214879/2000 2000-07-14
JP214879/00 2000-07-14

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CN1177320C CN1177320C (en) 2004-11-24

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KR100497371B1 (en) * 2002-12-07 2005-06-28 삼성전자주식회사 Light emitting module and optical pickup apparatus adopting the same
CN100426394C (en) 2005-03-18 2008-10-15 鸿富锦精密工业（深圳）有限公司 Optical system for disc recording and reproduction device
KR100971932B1 (en) * 2008-04-22 2010-07-27 이송애 Barber's pole

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JPH07261115A (en) * 1994-03-18 1995-10-13 Canon Inc Laser beam shaper
TW287239B (en) * 1994-06-07 1996-10-01 Philips Electronics Nv
JPH1049909A (en) * 1996-07-29 1998-02-20 Asahi Glass Co Ltd Optical head device
US6128134A (en) * 1997-08-27 2000-10-03 Digital Optics Corporation Integrated beam shaper and use thereof
JPH11344666A (en) * 1998-06-03 1999-12-14 Konica Corp Optical pickup

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