CN1177320C - Composite optical component and composite optical unit thereof - Google Patents

Composite optical component and composite optical unit thereof

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Publication number
CN1177320C
CN1177320C CNB011198680A CN01119868A CN1177320C CN 1177320 C CN1177320 C CN 1177320C CN B011198680 A CNB011198680 A CN B011198680A CN 01119868 A CN01119868 A CN 01119868A CN 1177320 C CN1177320 C CN 1177320C
Authority
CN
China
Prior art keywords
mentioned
composite optical
laser
beam shaping
incidence
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.)
Expired - Fee Related
Application number
CNB011198680A
Other languages
Chinese (zh)
Other versions
CN1341924A (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
Original Assignee
Alps Electric Co Ltd
Priority date (The priority date 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 date listed.)
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
Expired - Fee Related legal-status Critical Current

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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

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)
  • Semiconductor Lasers (AREA)

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.
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 is mainly by constituting with the lower part: the pick-up body is carrier 500, be configured in composite optical unit 101, flat catoptron 300, collimation lens 400, object lens 200 in this carrier 500.In composite optical unit 101, comprise beam shaping parts 109.
Optical take-up apparatus 100 is in the face of CD for example compact disc 61 or Digital video disc (DVD) 62 and dispose, as movable support mirror 200 with focusing (F) direction of the direction of the panel surface quadrature of compact disc 61 (Digital video disc 62) and on as tracking (T) direction of the radial direction of compact disc 61 (Digital video disc 62).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: laser radiation to CD, by receiving the reflected light (back light) from CD, is come the information of playback of recorded on CD, perhaps, recorded information on CD.As shown in Figure 1, it is mainly by constituting with the lower part: as two long wavelength laser diodes 102 of luminous component, the built-in photosensitive-member 104 of photo-sensitive cell 104a, composite optical component 105, beam shaping parts 109, printed circuit board (PCB) 107, shell 106 that these parts were installed and fixed.
As shown in Figure 2, two long wavelength laser diodes 102 are by forming with the lower part: discoideus matrix part 102a, from the base station 102b of the side's of matrix part 102a the outstanding square bodily form that is provided with of planar portions 102a ', locate and be fixed on chip of laser 103 on the sidewall surfaces of base station 102b, be fixed on planar portions 102a ' and go up by the body 102c of tubular and the sky plate 102d that forms peristome 102d ' and form the 102e of cap portion, be fixed into from the transparent discoideus glass plate 102f of the inboard occlusion of openings 102d ' of portion of the 102e of cap portion with containing base station 102b.Configuration chip of laser 103 in the airtight space that constitutes having matrix part 102a, the 102e of cap portion and glass plate 102f.In this chip of laser 103, separate small interval D and form: the light source 103b of long wavelength's's (wavelength 780nm band) that the light source 103a of short wavelength's's (wavelength 650nm band) that the ejaculation Digital video disc is used laser 103a ' and ejaculation compact disc are used laser 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 as the Digital video disc standard.
And from light source 103a, laser 103a ', the 103b ' that 103b penetrates respectively penetrates by peristome 102d ', so as with the direction of the side's of matrix part 102a planar portions 102a ' quadrature on become and be parallel to each other.And the ejaculation position of laser 103a ', 103b ' becomes on the same plane of top end surface 103 ' (being configured to parallel with planar portions 102a ') of chip of laser 103.And, from with the opposing party's of the side's of matrix part 102a planar portions 102a ' opposite side outstanding a plurality of external connection terminals 102g (with reference to Fig. 1) that are provided with of planar portions, carry out power supply by this external connection terminals 102g to the drive current of chip of laser 103.
And, in the operation of making two long wavelength laser diodes 102, the chip of laser 103 that comprises two light source 103a, 103b on predetermined substrate surface by processing with the similar processing of semiconductor processes, therefore, the interval D between each light source 103a, 103b easily the high precision adequate relief become predetermined value.Therefore,, can produce in a large number, and the cost of two long wavelength laser diodes 102 can be cheap as discrete parts.
Photosensitive-member 104, as shown in Figure 1, built-in photo-sensitive cell 104a, and the assembly 104b of sensitization window 104b ' be set and constituted by light-sensitive surface side from the outstanding external connection terminals 104c that is set to both sides of assembly 104b at this photo-sensitive cell 104a, by external connection terminals 104c carry out to the supply voltage of photo-sensitive cell 104a provide and by the output of the signal of photo-sensitive cell 104a institute light-to-current inversion to the outside.
Fig. 3 is made up of the formed body of the higher resin material of transparency to composite optical component 105 shown in Figure 6, by the formed abreast slightly cone shape matrix part 105c of the both ends of the surface of optical axis N direction, from the plane of incidence 105a of the emitted laser of above-mentioned two long wavelength laser diodes 102, exit facet 105b, the reflecting surface 105d that the back light from CD is transmitted on the above-mentioned photo-sensitive cell 104a from the emitted laser of above-mentioned two long wavelength laser diodes 102 towards the CD ejaculation are formed.And, in the related composite optical component 105 of present embodiment, two end faces of matrix part 105c become the plane of incidence 105a and the exit facet 105b of laser respectively, are above-mentioned exit facet 105b from the plane of incidence dual-purpose of the back light of CD, inject above-mentioned exit facet 105b from the back light of CD.
As shown in Figure 3 and Figure 4, make from the emitted laser diffraction of two long wavelength laser diodes 102 by above-mentioned plane of incidence 105a, be formed for generating the tracking Control that is radiated on the compact disc with and the three beams of the three beams used of data playback generate and use diffraction grating 105h, as Fig. 6 and shown in Figure 8, be formed for the back light from CD is transmitted to the first square diffraction grating 105f on the reflecting surface 105d at the central portion of exit facet 105b.
Reflecting surface 105d becomes the dip plane that tilts with respect to the both ends of the surface of composite optical component 105, on the surface of this reflecting surface 105d, as shown in Figure 3 and Figure 4, is formed for proofreading and correct the second diffraction grating 105g of reflection-type in the path of back light.Passing through on the path of the back light that is reflected by this reflecting surface 105d, flat surfaces 105n strides across the side face of matrix part 105c and forms.And as shown in Figure 6, from the edge part of this flat surfaces 105n, the face of cylinder 105i that is used to carry out by the focus control that method of astigmatism carried out forms the ditch shape that becomes predetermined angle with optical axis N, and the inwall of this face of cylinder 105i becomes back light exit facet 105p.
And, in the related composite optical component 105 of present embodiment, the above-mentioned first diffraction grating 105f, the second diffraction grating 105g and three beams are used mould with diffraction grating 105h with above-mentioned plane of incidence 105a, exit facet 105b, matrix part 105c, reflecting surface 105d and face of cylinder 105i and are one-body molded.Function for these diffraction grating 105f, 105g, 105h is described in detail in the back.
Matrix part 105c forms: the virtually conical shape that diminishes successively to exit facet 105b side diameter from plane of incidence 105a, leading section at this matrix part 105c forms cylindrical portion 105j, and its face of cylinder 105j ' becomes first restrictions of 105 pairs of shells 106 of composite optical component.
As shown in Figure 3 and Figure 4, be on the outer peripheral face of formation portion side of plane of incidence 105a and reflecting surface 105d in the rear end side of this matrix part 105c, 4 teat 105k ' with half-terete outside surface are in circumferentially approximate equality ground configuration, and the end face of these teats 105k ' becomes second restrictions of 105 pairs of shells 106 of composite optical component.And, on the rear end face (comprising the part of above-mentioned plane of incidence 105a and the part of above-mentioned reflecting surface 105d) of this matrix part 105c, as Fig. 3, Fig. 5 and shown in Figure 15, with the relative part of above-mentioned each teat 105k ', with the recessed spatial portion 105s that is formed for cushioning the power that is pressed into of 105 pairs of shells 106 of composite optical component of predetermined depth.And,,, to give prominence to downwards and form columned position limit teat 105m to shown in Figure 6 as Fig. 3 at the central portion of matrix part 105c, its outer peripheral face becomes the 3rd restrictions of 105 pairs of shells 106 of composite optical component.
And the composite optical component 105 of present embodiment as same surface, still, also can be provided with the exit facet and the back light plane of incidence to exit facet 105b and the back light plane of incidence respectively, forms first diffraction grating on this back light plane of incidence.
Fig. 7 and beam shaping parts 109 shown in Figure 8 are made up of the formed body of the high resin material of transparency, the 109a of beam shaping portion, from the outwardly directed discoid flange part 109b of the 109a of this beam shaping portion, from the outstanding pin shape restriction teat 109c of the outer peripheral face of this flange part 109b, roughly 3 on the equally spaced outstanding outer peripheral face that is arranged on this flange part 109b are half-terete fixingly forms with projection 109d.As shown in Figure 8, on the 109a of beam shaping portion, form cylindrical lens, this cylindrical lens one side 109a " form planely, its opposite face (lens face) 109a ' forms columned concave surface.As shown in Figure 7, the 109a of this beam shaping portion is formed on the central part of flange part 109b.Said fixing forms respectively on the thickness direction of flange part 109b abreast with projection 109d, and its top becomes first restrictions of 109 pairs of shells 106 of beam shaping parts.And as shown in Figure 7, restriction teat 109c vertically forms with respect to the center of curvature axle S-S of face of cylinder 109a ', and its side face becomes second restrictions of 109 pairs of shells 106 of beam shaping parts.
Above-mentioned beam shaping parts 109 as shown in Figure 2, are installed in face of cylinder 109a ' in the shell 106 towards two long wavelength laser diodes, 102 sides, and the some shape of the laser that penetrates from two long wavelength laser diodes 102 is shaped as circle.Promptly, because the point of the laser that penetrates from two long wavelength laser diodes 102 is shaped as ellipse, make its major diameter direction abreast towards above-mentioned center of curvature axle S-S, 109a injects laser to beam shaping portion (cylindrical lens), thus, minor axis direction that can expansion of laser light, and the some shape of laser is shaped as circle.
Fig. 9～shell 106 shown in Figure 13 is made up of the piece of aluminum dipping form casting manufacturing, the main installation portion 106h that gives prominence to setting by tubular body 106g, from outside respectively side, the both ends of this tubular body 106g, and 106i forms.At these installation portions 106h, form square installed surface 106h ' on the 106i respectively, 106i '.
As shown in figure 10, on the inside surface of the left part of tubular body 106g, be formed for holding the accommodating chamber 106a of two long wavelength laser diodes 102 shown in Figure 2, follow it, the recessed installation pit hole 106b that is formed for locating and installing two long wavelength laser diodes 102 on the left side.And, recessedly on the inside surface of the substantial middle portion of tubular body 106g be formed for locating and the stage portion 106m of installation diagram 7 and beam shaping parts 109 shown in Figure 8.And, on the inside surface of the right part of tubular body 106g, be formed for holding the accommodating chamber 106c of Fig. 3, form the first restriction receiving portion 106j that inserts first restrictions (face of cylinder 105j ') that is formed on the above-mentioned composite optical component 105 respectively and insert the second restriction receiving portion 106k of second restrictions (teat 105k ') that is formed on the above-mentioned composite optical component 105 in its both end sides to composite optical component 105 shown in Figure 6.These each accommodating chambers 106a, 106c and stage portion 106m form with one heart with respect to central shaft N '.
Above-mentioned stage portion 106m forms such position: when touching the flange part 109b of beam shaping parts 109, the 109a of beam shaping portion is set on the precalculated position between two long wavelength laser diodes 102 and the composite optical component 105.And, the diameter of the beam shaping component settings side of above-mentioned stage portion 106m forms the smaller diameter of external diameter of a circle than the fixing top with projection 109d of external first restrictions as 109 pairs of shells 106 of beam shaping parts, can fix by being pressed into beam shaping parts 109.
The accommodating chamber 106c that is used to hold above-mentioned composite optical component 105 forms such conical surface-shaped: the diameter of accommodation section 106k side that is used to hold above-mentioned two long wavelength laser diodes 102 is bigger, extends to installed surface 106i ' side and reduces diameter successively.And, the diameter of the first restriction receiving portion 106j is set to such size: cylindrical portion 105j (diameter D1) that can chimeric accurately composite optical component 105 (with reference to Fig. 3), the diameter of the second restriction receiving portion 106k is set to such diameter: less than the external diameter of a circle D2 (with reference to Fig. 4) on the top of each teat 105k ' on the external rearward end 105k that is located at composite optical component 105, can fix by being pressed into composite optical component 105 slightly.
Leading section at above-mentioned accommodating chamber 106c is formed for promptly contacting face 106c ' in the location division of central shaft N ' direction location composite optical component 105.Contact the peristome 106f that offers circle on the face 106c ' at this, so that the first diffraction grating 105f that is located on the composite optical component 105 exposes from the place ahead.
And, on above-mentioned tubular body 106g, as Figure 10 and shown in Figure 13, be formed on above-mentioned accommodating chamber 106a, 106c and stage portion 106m go up the fan-shaped guiding ditch 106d ' that the position limit ditch 106d of the U font that connects and rear end with this position limit ditch 106d are connected and connect in the rear end of above-mentioned accommodating chamber 106a.The ditch width of above-mentioned position limit ditch 106d is set to so predetermined size: outstanding outer peripheral face and the outstanding outer peripheral face that is arranged on the position limit teat 105m on the composite optical component 105 that is arranged on the restriction teat 109c on the above-mentioned beam shaping parts 109 can be chimeric accurately.And, be formed for disposing the configuration plane 106e of photosensitive-member 104 in part near the above-mentioned position limit ditch 106d of this tubular body 106g.This configuration plane 106e, as shown in Figure 1, when at above-mentioned installation portion 106h, the installed surface 106h ' of 106i, 106i ' goes up when the printed circuit board (PCB) 107 that is electrically connected photosensitive-member 104 is installed, at above-mentioned each installed surface 106h ', form needed step between the 106i ', so that photosensitive-member 104 can not influence shell 106.
And the piece that is used for shell 106 not only can be made of aluminum die cast, also can be made of zinc die casting, magnesium alloy or other metal etc.
Below, come two long wavelength laser diodes 102, photosensitive-member 104, composite optical component 105 and beam shaping parts 109 are described to the installation method of shell 106 with reference to Fig. 1.
Under position limit teat 105m and the state that the peristome of guiding ditch 106d ' on being formed on shell 106 aligns, insert composite optical component 105 from the installation pit hole 106b of shell 106, with not shown needed anchor clamps, compress the surface except that the diffraction grating 105h of plane of incidence 105a equably, thus, this matrix part 105c embeds in the accommodating chamber 106c.Then, touch in the stage of the face that the contacts 106c ' among the accommodating chamber 106c that is formed on shell 106, finish the location of central shaft N ' direction shell 106 in the outer edge of exit facet 105b.
At this moment, the cylindrical portion 105j that is located on the matrix part 105c is entrenched on the first restriction receiving portion 106j of accommodating chamber 106c, therefore, face of cylinder 105j ' (the restriction face of the cylindrical portion 105j of matrix part 105c, with reference to Fig. 3) touch on the first restriction receiving portion 106j, finished accurately with the position limit of the direction of optical axis N quadrature in the leading section of matrix part 105c.And meanwhile, the rearward end 105k of matrix part 105c 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, each teat 105k ' that is formed on the outer peripheral face of rearward end 105k becomes the state that evenly compresses respectively, the top end face (restriction face) of each teat 105k ' contacts with the second restriction receiving portion 106k, finished accurately with the position limit of the direction of central shaft N ' quadrature among the rearward end 105k of matrix part 105c, simultaneously, prevented the disengaging of composite optical component 105 from accommodating chamber 106c.And, by composite optical component 105 is embedded the accommodating chamber 106c that is located on the shell 106, the position limit teat 105m that is formed on the composite optical component 105 is directed among the guiding ditch 106d ' that is formed in the shell 106, be embedded into position limit ditch 106d, therefore, finished accurately around the position limit of the sense of rotation of central shaft N '.
Like this, the composite optical unit 101 of present embodiment, not only can embed shell 106 to composite optical component 105, and can carry out the position limit of the central shaft N ' direction of 105 pairs of shells 106 of composite optical component, with the position limit of the direction of central shaft N ' quadrature, around the position limit of the sense of rotation of central shaft N ', therefore, can easily and carry out the assembling of composite optical unit 101 accurately.And, the composite optical unit 101 of present embodiment, with composite optical component 105 in the recessed formation spatial portion of the corresponding part of the formation portion 105s of teat 105k ', therefore, in the time of on the top end face (restriction face) of each teat 105k ' being touched the second restriction receiving portion 106k, the formation portion of each teat 105k ' is in spatial portion 105s side elastic deformation, thus, it is pressed into power and is relaxed, can prevent to surpass the necessary masterpiece that is pressed into uses on the composite optical component 105, can prevent the distortion of optical function portion, the particularly second diffraction grating 105g and the three beams distortion of diffraction grating 105h.
Under the state that pin shape restriction teat 109c that gives prominence to from the outer peripheral face of flange part 109b and the peristome that is formed on the guiding ditch 106d ' on the shell 106 are aligned, insert beam shaping parts 109 from the installation pit hole 106b of shell 106, with not shown needed anchor clamps, the one side of the 109b of press flange portion equably, thus, be embedded among the stage portion 106m on the substantial middle portion inside surface that is formed on shell 106.Then, touch in the stage of stage portion 106m, the location of the central shaft N ' direction of shell 106 is done at the opposite face that compresses side with flange part 109b.
And, meanwhile, be formed on the inside surface that three half-terete fixing tops with projection 109d (first restrictions) on the outer peripheral face of flange part 109b are pressed into shell 106, therefore, finished accurately with the position limit of the direction of central shaft N ' quadrature, simultaneously, prevent that beam shaping parts 109 from coming off from stage portion 106m.And, insert action along with 109 pairs of shells 106 of beam shaping parts, the restriction teat 109c (second restrictions) that gives prominence to from the outer peripheral face of flange part 109b is directed into the guiding ditch 106d ' that is formed on the shell 106, and be embedded into position limit ditch 106d, therefore, around the position limit of the sense of rotation of central shaft N ' to finish accurately.
Like this, the composite optical unit 101 of present embodiment, not only can embed shell 106 to beam shaping parts 109, and can carry out the position limit of the central shaft N ' direction of 109 pairs of shells 106 of beam shaping parts, with the position limit of the direction of central shaft N ' quadrature, around the position limit of the sense of rotation of central shaft N ', therefore, can easily and carry out the assembling of composite optical unit 101 accurately.
Two long wavelength laser diodes 102 insert the 102e of its cap portion (with reference to Fig. 2) in the accommodating chamber 106a of shell 106, matrix part 102a are embedded be formed on the shell 106 among the 106b of installation pit hole, thus, are 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 and automatically align with the central shaft N ' of shell 106, can make from two long wavelength laser diodes, 102 emitted laser be injected into the 109a of beam shaping portion in the heart, therefore, can be shaped as circle to the some shape of laser.
Photosensitive-member 104 as Fig. 1 and shown in Figure 15, is installed on the shell 106 by printed circuit board (PCB) 107.The installation of 104 pairs of printed circuit board (PCB)s 107 of this photosensitive-member is carried out like this: the sensitization window 104b ' side of handle component 104b is passed the through hole 107a that is located on the printed circuit board (PCB) 107, external connection terminals 104c is clamped to be formed on the printed circuit board (PCB) 107 lip-deep clamping parts (not shown).And, can bond on printed circuit board (PCB) 107 or the shell 106 with bonding agent handle component 104b is firm as required.And, the fixing printed circuit board (PCB) 107 of photosensitive-member 104, under the relative state of position limit ditch 106d on being configured to sensitization window 104b ' and being formed on shell 106, be carried on installation portion 106h, each installed surface 106h ' of 106i, on the 106i ', carry out screw fixed with bolt 108, and be fixed on the shell 106.And, carry the printed circuit board (PCB) 107 of photosensitive-member 104, when passing through predetermined benchmark optical system from light source 103a, the laser 103a ' that 103b is emitted, when the pairing back light from CD of 103b ' carries out diffraction by the first diffraction grating 105f and the second diffraction grating 105g in advance, be adjusted on the precalculated position P that the most suitably is directed to photo-sensitive cell 104a, then, be fixed on installed surface 106h ", on the 106i '.
The playback of Digital video disc 62 that optical take-up apparatus 100 is carried out and compact disc 61 action describes below.
In the above-described configuration, when playback Digital video disc 62, as shown in Figure 1, the three beams that the laser 103a ' that penetrates from the light source 103a of two long wavelength laser diodes 102 sees through on the plane of incidence 105a that is formed on composite optical component 105 is transformed to three beams with diffraction grating 105h, then, see through the first diffraction grating 105f, penetrate from exit facet 105b.
Then, this laser 103a ' is by being configured to become the catoptrons 300 of 45 degree to make its angle deflection 90 degree with the direct of travel of laser 103a ', and injects in the parallel light tube lens 400 of the top that is configured in catoptron 300.Then, the laser 103a ' that becomes almost parallel light by these parallel light tube lens 400 injects object lens 200.Optically focused effect by object lens 200 is imaged on the information recording surface of Digital video disc 62.
Then, see through object lens 200 once more by 62 laser light reflected of Digital video disc (back light) 103a ', and through parallel light tube lens 400, reflected by catoptron 300, then, inject and be formed on the back light plane of incidence shown in Figure 1 and promptly be formed on the first diffraction grating 105f on the exit facet 105b, become the back light 103a '-2 of a diffraction light that is diffracted into predetermined angle of diffraction.The back light reflecting surface 105d that back light 103a '-2 then is formed on the composite optical component 105 reflects, and incides among the 105i of the face of cylinder, penetrates from back light exit facet 105p.And the back light 103a '-2 of ejaculation (with reference to Fig. 8, Figure 11), and incides on the photosensitive sites P among the photo-sensitive cell 104a of photosensitive-member 104 by position limit ditch 106d.
At this moment, the back light 103a '-2 that is accepted by photo-sensitive cell 104a is carried out light-to-current inversion, thus, by the corresponding electric current output transform of the handle and the signal of the information recording surface of Digital video disc 62 is that voltage signal generates replay signal, be output from the external connection terminals 104b of photosensitive-member 104, be transmitted to the outside by printed circuit board (PCB) 107.And the part of the back light 103a '-2 that is accepted by photo-sensitive cell 104a is used to focus on and tracking Control.
On the other hand, when playback compact disc 61, the laser 103b ' that penetrates from the light source 103b of two long wavelength laser diodes 102, as shown in Figure 1, the three beams that sees through on the plane of incidence 105a that is formed on composite optical component 105 is transformed to three beams with diffraction grating 105h, then, see through the first diffraction grating 105f, penetrate from exit facet 105b.Then, this laser 103b ' identical object lens 200 that are transmitted to during with Digital video disc 62, the optically focused effect by object lens 200 is 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 200, parallel light tube lens 400 once more, and is reflected by catoptron 300, then, inject the first diffraction grating 105f, become the back light 103b '-2 of a diffraction light that is diffracted into predetermined angle of diffraction.Back light 103b '-2 then is formed on the back light reflecting surface 105d on the composite optical component 105 " reflect, inject face of cylinder 105i.In the 105i of the face of cylinder, back light 103b '-2 is provided for the method for astigmatism of focus control, penetrates back light exit facet 105p, and (with reference to Figure 10, Figure 13), and is accepted by the photosensitive sites P among the photo-sensitive cell 104a by position limit ditch 106d.At this moment, the back light 103b '-2 that is accepted by photo-sensitive cell 104a is carried out light-to-current inversion, thus, by the corresponding electric current output transform of the handle and the signal of the information recording surface of compact disc 61 is voltage signal, and the formation replay signal, be output from the external connection terminals 104b of photosensitive-member 104,, be transmitted to the outside by printed circuit board (PCB) 107.And the part of the back light 103b '-2 that is accepted by photo-sensitive cell 104a is used to the tracking Control that focus control that method of astigmatism carries out and three beams are carried out.
And, in optical take-up apparatus 100, the laser 103a ' that restriction is penetrated from exit facet 105b can be set, the wavelength optical filtering of the diameter of the light beam of 103b ' etc. in the light path between exit facet 105b and the object lens 200.
Below the function that comprises each diffraction grating 105f, 105g, 105h in the composite optical component 105 is described.
As shown in figure 15, with the laser 103a ' that penetrates from the exit facet 105b of composite optical component 105,103b ' corresponding respectively from the back light of Digital video disc 62 and compact disc 61 respectively by the first diffraction grating 105f institute diffraction that is formed on the exit facet 105b, and become back light 103a '-2 and back light 103b '-2.At this moment, owing to be longer than wavelength corresponding to the back light 103a '-2 of Digital video disc 62 corresponding to the wavelength of the back light 103b '-2 of compact disc 61, therefore, the angle of diffraction of back light 103b '-2, angle of diffraction greater than back light 103a '-2 (is utilized such principle: in diffraction grating, wavelength is long more, and angle of diffraction is big more).
And, utilize the poor of this angle of diffraction, make before diffracted that distance be the state of D between laser 103a ', 103b ' optical axis separately, as back light 103a '-2, back light 103b '-2 arrival back light reflecting surface 105d " time, both in-positions are consistent.
But, back light reflecting surface 105d at composite optical component 105 " in; back light 103a '-2, back light 103b '-2 are reflected simply; because the incident angle difference of both sides' laser, 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, at back light reflecting surface 105d " on the second diffraction grating 105g is set.Promptly, back light 103a '-2 and back light 103b '-2 poor by the different angle of diffraction that produce of wavelength once more among the second diffraction grating 105g incided in utilization, makes by back light reflecting surface 105d " the back light 103a '-2 of reflection and back light 103b '-2 both sides' optical axis be consistent.
Like this, can be respectively the back light 103a '-2 of institute's diffraction and back light 103b '-2 proofread and correct to being accepted by the photosensitive sites P of photo-sensitive cell 104a by the first diffraction grating 105f, even use light source 103a, the 103b of 2 wavelength, also can accept both sides' laser with photosensitive-member with a photo-sensitive cell 104a.
As described above, the composite optical unit 101 that present embodiment is related, as shown in Figure 1, has 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 composite optical component 105, two long wavelength laser diodes 102 have the laser diode 103a of the short wavelength laser used of emission Digital video disc and the long wavelength laser diode 103b that the emission compact disc is used, composite optical component 105 is provided with: the plane of incidence 105a of the light incident of penetrating from two long wavelength laser diodes 102 and the exit facet 105b of ejaculation, the back light that is reflected by the CD D1 (D2) that is located on the exit facet 105b is carried out the first diffraction grating 105f of diffraction, back light by the first diffraction grating 105f institute diffraction is reflexed to reflecting surface 105d on the photosensitive-member 104, simultaneously in that also to be provided with the optical axis that makes the different light of wavelength on the reflecting surface 105d consistent and be imaged onto the second diffraction grating 105g on the photosensitive sites P of photosensitive-member 104, therefore, the enough composite optical units 101 of energy are suitable for using the optical take-up apparatus 100 of two different wave lengths.And photosensitive-member 104 can be one, can only adjust this photosensitive-member 104 and carry out the position cooperation, therefore, the cost of adjusting in the operation is increased.And, make from the exit facet 105b of the emitted laser of two long wavelength laser diodes 102 and incident the back light plane of incidence to be on the same level from the back light of CD, therefore, put from this, can simplify formation.
And, two long wavelength laser diodes 102 are by matrix part 102a, the assembly that constitutes by 102e of cap portion and glass plate 102f, constitute from the outstanding external connection terminals 102g that is provided with of matrix part 102a, photosensitive-member 104 is by the assembly 104b of built-in photo-sensitive cell 104a and is located at the so-called discrete parts that the external connection terminals 104c on this assembly 104b is constituted, use respectively and constitute composite optical unit 101 with the cheap parts of making of monomer, therefore, it is easy that the processing of each parts becomes, and, assembling work to shell 106 becomes easily, can reduce component costs and processing charges.
And, resin material with cheapness forms composite optical component 105, simultaneously, when composite optical component 105 moulding, the integrally formed first and second diffraction grating 105f of while, 105g, three beams diffraction grating 105h, face of cylinder 105i, therefore, molding time can shorten, and can further reduce the manufacturing cost of composite optical component 105.
And, in shell 106, comprise beam shaping parts 109, therefore, the waste that shines the laser power on the CD can be reduced, and the light picker of the optical disc apparatus of the laser power that for example needs such as Digital video disc device are bigger can be suitable for.
And, in beam shaping parts 109, form: the 109a of beam shaping portion, from the outwardly directed discoid flange part 109b of the 109a of this beam shaping portion, be formed on the restriction teat 109c on this flange part 109b, on the inside surface of shell 106, formation contacts the stage portion 106m and the position limit ditch 106d that inserts above-mentioned restriction teat 109c of the end face of above-mentioned flange part 109b, use the end face of above-mentioned stage portion 106m and above-mentioned flange part 109b to constitute first restraint device, simultaneously, use above-mentioned position limit ditch 106d and above-mentioned restriction teat 109c to constitute second restraint device, therefore, only by beam shaping parts 109 are pressed in the shell 106, just can finish the stance adjustment of 109 pairs of laser beam axis of beam shaping parts automatically, when assembling beam shaping parts 109 in shell 106, the anchor clamps that do not need special position adjustment usefulness, therefore, can simplify the assembling of the composite optical unit 101 that comprises beam shaping parts 109, simultaneously, the assembly force that acts between shell 106 and the beam shaping parts 109 is affacted on the 109a of beam shaping portion, and can prevent distortion and the displacement of the 109a of beam shaping portion, therefore, can improve the optical characteristics of the composite optical unit 101 that comprises beam shaping parts 109.
And, the composite optical unit that present embodiment is related, the cylindrical lens that use forms in the 109a of beam shaping portion is as beam shaping parts 109, the central shaft of this cylindrical lens of arranged coaxial and from the optical axis of the emitted laser of two long wavelength laser diodes 102, lens face with respect to cylindrical lens, vertical incidence laser, so that carried out of the central axis direction ejaculation of the laser of beam shaping from cylindrical lens, therefore, just can needn't increase the radial dimension of shell 106, and beam shaping parts 109 are set in shell 106, can constitute the composite optical unit that comprises beam shaping parts 109 compactly.
Below, second embodiment of composite optical unit involved in the present invention is described according to Figure 16 and Figure 17.Figure 16 is the sectional drawing of the related composite optical unit of second embodiment 101, and Figure 17 is the major part amplification profile diagram of beam shaping parts 109 included in the related composite optical unit 101 of second embodiment.
As Figure 16 and shown in Figure 17, the composite optical unit 101 of present embodiment is characterised in that: comprise the beam shaping parts 109 that form triangular prism in the 109a of beam shaping portion.The 109a of beam shaping portion (triangular prism), as shown in figure 17, the plane of incidence 109a ' of laser beam is formed on the dip plane that tilts with respect to central shaft N ', the exit facet 109a of laser " be formed on respect on the vertical plane of central shaft N '; so that the vergence direction from the minor axis direction of the emitted laser of two long wavelength laser diodes 102 towards plane of incidence 109a ' and carry out incident; thus, can be from exit facet 109a " the some shape of emitted laser is shaped as circle.Promptly, as described above, owing to be shaped as ellipse, then by making its minor axis direction carry out incident towards the vergence direction of plane of incidence 109a ' from the point of the emitted laser of two long wavelength laser diodes 102, and 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 constitutes 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 being used to set the stage portion 106m of beam shaping parts 109 and the accommodating chamber 106c of composite optical component 105, the accommodating chamber 106a of two long wavelength laser diodes 102 is obliquely installed, in accommodating chamber 106a, insert the 102e of cap portion of two long wavelength laser diodes 102, in the 106b of installation pit hole, embed the matrix part 102a of two long wavelength laser diodes 102, thus, can make from the emitted laser of two long wavelength laser diodes 102 and carry out incident with the needed incident angle that obtains needed beam shaping effect with respect to the plane of incidence 109a ' of the 109a of beam shaping portion.
For other parts, since identical with the related composite optical unit 101 of first embodiment with beam shaping parts 109, therefore, corresponding part is used same numeral and omitted its explanation.
This routine composite optical unit 101 is except having the effect identical with the related composite optical unit of first embodiment 101, use formed triangular prism in the 109a of beam shaping portion is used as beam shaping parts 109, the plane of incidence with respect to this triangular prism, tilted configuration is from the optical axis of the emitted laser of two long wavelength laser diodes 102, the plane of incidence with respect to triangular prism, the above-mentioned laser of incident obliquely, so that the laser after the shaping penetrates at the central axis direction of above-mentioned shell 106, therefore, the installation portion of two long wavelength laser diodes 102 in the shell 106 is tilted with respect to the installation portion of the beam shaping parts 109 in the shell 106 and the installation portion of composite optical component 105, can simplify of the installation of two long wavelength laser diodes 102 to needed installation portion.
In addition, in the above-described embodiments, use to have two different light source 103a of wavelength, two long wavelength laser diodes 102 of 103b are as luminous component, but, also can use the luminous component that only comprises a light source, also can use luminous component with the different light source more than 3 of wavelength.
And, in above-mentioned first embodiment, in the 109a of beam shaping portion, use cylindrical lens as beam shaping parts 109, in above-mentioned second embodiment, in the 109a of beam shaping portion, use triangular prism as beam shaping parts 109, replace above-mentioned formation, other light-beam forming unit of circular diffraction grating etc. for example can be set in the 109a of beam shaping portion.
Use the figure of Figure 18～Figure 20 and first embodiment that the third embodiment of the present invention is described below.
Figure 18 is the pie graph of the optical take-up apparatus 100 of the composite optical unit that comprises that the 3rd embodiment is related, and Figure 19 is the front view of the related composite optical component of the 3rd embodiment 105, and Figure 20 is the synoptic diagram that is used to illustrate the function of composite optical component 105.
As shown in figure 18, optical take-up apparatus 100 is mainly by constituting with the lower part: the pick-up body is carrier 500, be configured in composite optical unit 101, flat catoptron 300, collimation lens 400, object lens 200 in this carrier 500.In composite optical unit 101, comprise composite optical component 105.
Optical take-up apparatus 100 is in the face of CD for example compact disc 61 or Digital video disc 62 and dispose, as movable support mirror 200 with focusing (F) direction of the direction of the panel surface quadrature of compact disc 61 (Digital video disc 62) and on as tracking (T) direction of the radial direction of compact disc 61 (Digital video disc 62).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: laser radiation to CD, by receiving the reflected light (back light) from CD, is come the information of playback of recorded on CD, perhaps, recorded information on CD.As shown in Figure 1, it is mainly by constituting with the lower part: as two long wavelength laser diodes 102 of luminous component, the built-in photosensitive-member 104 of photo-sensitive cell 104a, composite optical component 105, printed circuit board (PCB) 107, shell 106 that these parts were installed and fixed.
Two long wavelength laser diodes 102, identical with first embodiment, as shown in Figure 2, by forming: discoideus matrix part 102a with the lower part, base station 102b from the side's of matrix part 102a the outstanding square bodily form that is provided with of planar portions 102a ', the location also is fixed on chip of laser 103 on the sidewall surfaces of base station 102b, being fixed on planar portions 102a ' upward is made up of to contain the 102e of cap portion of base station 102b with a sky plate 102d who forms peristome 102d ' the body 102c of tubular, be fixed into from the transparent discoideus glass plate 102f of the inboard occlusion of openings 102d ' of portion of the 102e of cap portion.Configuration chip of laser 103 in the airtight space that constitutes having matrix part 102a, the 102e of cap portion and glass plate 102f.In this chip of laser 103, separate small interval D and form: the light source 103b of long wavelength's's (wavelength 780nm band) that the light source 103a of short wavelength's's (wavelength 650nm band) that the ejaculation Digital video disc is used laser 103a ' and ejaculation compact disc are used laser 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 as the Digital video disc standard.
And from light source 103a, laser 103a ', the 103b ' that 103b penetrates respectively penetrates by peristome 102d ' so that with the direction of the side's of matrix part 102a planar portions 102a ' quadrature on become and be parallel to each other.And the ejaculation position of laser 103a ', 103b ' becomes on the same plane of top end surface 103 ' (being configured to parallel with planar portions 102a ') of chip of laser 103.And, from with the opposing party's of the side's of matrix part 102a planar portions 102a ' opposite side outstanding a plurality of external connection terminals 102g (with reference to Figure 18) that are provided with of planar portions, carry out power supply by this external connection terminals 102g to the drive current of chip of laser 103.
And, in the operation of making two long wavelength laser diodes 102, the chip of laser 103 that comprises two light source 103a, 103b on predetermined substrate surface by processing with the similar processing of semiconductor processes, therefore, the interval D between each light source 103a, 103b can easily become predetermined value with the high precision adequate relief.Therefore, as discrete parts, can produce in a large number, therefore, the cost of two long wavelength laser diodes 102 can be cheap.
Photosensitive-member 104, as shown in figure 18, built-in photo-sensitive cell 104a, and the assembly 104b of sensitization window 104b ' be set and constituted by light-sensitive surface side from the outstanding external connection terminals 104c that is set to both sides of assembly 104b at this photo-sensitive cell 104a, by external connection terminals 104c carry out to the supply voltage of photo-sensitive cell 104a provide and by the output of the signal of photo-sensitive cell 104a institute light-to-current inversion to the outside.
Composite optical component 105 shown in Figure 19, identical with first embodiment, formed body by the higher resin material of transparency is formed, by the formed abreast slightly cone shape matrix part 105c of the both ends of the surface of optical axis N direction, from the plane of incidence 105a of the emitted laser of above-mentioned two long wavelength laser diodes 102, forming towards exit facet 105b, the reflecting surface 105d that the back light from CD is transmitted on the above-mentioned photo-sensitive cell 104a that CD penetrates from above-mentioned two long wavelength laser diodes, 102 emitted laser.And the composite optical component 105 that present embodiment is related is above-mentioned exit facet 105b from the plane of incidence dual-purpose of the back light of CD, injects above-mentioned exit facet 105b from the back light of CD.
Plane of incidence 105a forms columniform concave surface, and the curvature of exit facet 105b is different with plane of incidence 105a, and forms: the central axis direction of curved surface is configured to the columniform convex surface that parallels with plane of incidence 105a.The curvature of these planes of incidence 105a and exit facet 105b, from the minor axis direction of the emitted laser of two long wavelength laser diodes 102 when the central axis direction of this plane of incidence 105a is injected the center of plane of incidence 105a, be adjusted to make become from the some shape of the emitted laser of exit facet 105b circular.For example, when the distance of the both ends of the surface of composite optical component 105 is 4mm, by making plane of incidence 105a become focal length is 2.6 concave surface, making exit facet 105b become focal length is 6.6 convex surface, just can be shaped as circle to the some shape from the emitted laser of above-mentioned two long wavelength laser diodes 102.Promptly, owing to be shaped as oval-shaped from the point of the emitted laser of two long wavelength laser diodes 102, then by making its minor axis direction come incident towards the central axis direction of plane of incidence 105a, just can be identical with the laser light incident side of the composite optical component that forms abreast at plane of incidence 105a and exit facet 105b or situation that exiting side has disposed cylindrical lens, the some shape from the emitted laser of exit facet 105b is shaped as circular.
And, shown in Figure 4 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 the tracking Control that is radiated on the compact disc with and the three beams of the three beams used of data playback generate and use diffraction grating 105h.
As shown in Figure 5, be formed for the back light from CD is transmitted to the first square diffraction grating 105f on the reflecting surface 105d at the central portion of exit facet 105b.
Reflecting surface 105d becomes the dip plane that tilts with respect to the both ends of the surface of composite optical component 105, on the surface of this reflecting surface 105d, as shown in Figure 4, is formed for proofreading and correct the second diffraction grating 105g of reflection-type in the path of back light.Passing through on the path of the back light that is reflected by this reflecting surface 105d, flat surfaces 105n strides across the side face of matrix part 105c and forms.And, as shown in Figure 6, from the edge part of this flat surfaces 105n, be used to carry out face of cylinder 105i by the focus control that method of astigmatism carried out and form and become the ditch shape that becomes predetermined angle with optical axis N, the inwall of this face of cylinder 105i becomes back light exit facet 105p.
And, in the related composite optical component 105 of present embodiment, the above-mentioned first diffraction grating 105f, the second diffraction grating 105g and three beams are used mould with diffraction grating 105h with above-mentioned plane of incidence 105a, exit facet 105b, matrix part 105c, reflecting surface 105d and face of cylinder 105i and are one-body molded.Function for these diffraction grating 105f, 105g, 105h is described in detail in the back.
Matrix part 105c forms: from the virtually conical shape that plane of incidence 105a diminishes successively to exit facet 105b side diameter, at the leading section formation cylindrical portion 105j of this matrix part 105c, its face of cylinder 105j ' becomes first restrictions to shell 106.
As shown in Figure 4, be on the outer peripheral face of formation portion side of plane of incidence 105a and reflecting surface 105d in the rear end side of this matrix part 105c, 4 teat 105k ' with half-terete outside surface are in circumferentially approximate equality ground configuration, and the column face of these teats 105k ' becomes second restrictions to shell 106.And, on the rear end face (comprising the part of above-mentioned plane of incidence 105a and the part of above-mentioned reflecting surface 105d) of this matrix part 105c, as Fig. 4 and shown in Figure 14, with the relative part of above-mentioned each teat 105k ', with the recessed spatial portion 105s that is formed for cushioning the power that is pressed into of 105 pairs of shells 106 of composite optical component of predetermined depth.
And, as shown in figure 19, at the central portion of matrix part 105c, the columned position limit teat 105m of outstanding downwards formation.
And the composite optical component 105 of present embodiment as same plane, still, also can be provided with the exit facet and the back light plane of incidence to exit facet 105b and the back light plane of incidence respectively, forms first diffraction grating on this back light plane of incidence.
Fig. 9～shell 106 shown in Figure 13 is made up of the piece of aluminum dipping form casting manufacturing, the main installation portion 106h that gives prominence to setting by tubular body 106g, from outside respectively side, the both ends of this tubular body 106g, and 106i forms.At these installation portions 106h, form square installed surface 106h ' on the 106i respectively, 106i '.
As shown in figure 10, on the inside surface of the left part of tubular body 106g, be formed for holding the accommodating chamber 106a of two long wavelength laser diodes 102 shown in Figure 2, follow it, the recessed installation pit hole 106b that is formed for locating and installing two long wavelength laser diodes 102 on the left side.On the other hand, on the inside surface of the right part of tubular body 106g, be formed for holding the accommodating chamber 106c of the composite optical component 105 shown in the soil 19, form first restriction receiving portion 106j that inserts first restrictions (face of cylinder 105j ') that is formed on the above-mentioned composite optical component 105 and the second restriction receiving portion 106k that inserts second restrictions (teat 105k ') that is formed on the above-mentioned composite optical component 105 in its both end sides respectively.These each accommodating chambers 106a, 106c forms with one heart with respect to central shaft N '.
The accommodating chamber 106c that is used to hold above-mentioned composite optical component 105 forms such conical surface-shaped: the diameter of accommodation section 106k side that is used to hold above-mentioned two long wavelength laser diodes 102 is bigger, extends to installed surface 106i ' side and reduces diameter successively.And, the diameter of the first restriction receiving portion 106j is set to such size: cylindrical portion 105j (diameter D1) that can chimeric accurately composite optical component 105 (with reference to Figure 19), the diameter of the second restriction receiving portion 106k is set to such preliminary dimension: the external diameter of a circle D2 (with reference to Fig. 4) that is shorter than the top of each teat 105k ' on the external rearward end 105k that is located at composite optical component 105.
The location division that is formed for location composite optical component 105 on central shaft N ' direction at the leading section of above-mentioned accommodating chamber 106c promptly contacts face 106c '.Contact the peristome 106f that offers circle on the face 106c ' at this, so that the first diffraction grating 105f that is located on the composite optical component 105 exposes from the place ahead.
And, on above-mentioned tubular body 106g, as Figure 10 and shown in Figure 13, be formed on above-mentioned accommodating chamber 106a, the fan-shaped guiding ditch 106d ' that the position limit ditch 106d of the U font that connects among the 106c is connected with rear end with this position limit ditch 106d and connects in the rear end of above-mentioned accommodating chamber 106a.The ditch width of above-mentioned position limit ditch 106d is set to so predetermined size: the outstanding external diameter that is arranged on the position limit teat 105m on the composite optical component 105 can be chimeric accurately.And, be formed for disposing the configuration plane 106e of photosensitive-member 104 in part near the above-mentioned position limit ditch 106d of this accommodation section 106g.This configuration plane 106e, as shown in figure 18, when at above-mentioned installation portion 106h, the installed surface 106h ' of 106i, 106i ' goes up when the printed circuit board (PCB) 107 that is electrically connected photosensitive-member 104 is installed, at above-mentioned each installed surface 106h ', form needed step between the 106i ', so that photosensitive-member 104 can not influence shell 106.
And the piece that is used for shell 106 not only can be made of aluminum die cast, also can be made of zinc die casting, magnesium alloy or other metal etc.
Below, come two long wavelength laser diodes 102, photosensitive-member 104 and composite optical component 105 are described to the installation method of shell 106 with reference to Figure 18.
Under position limit teat 105m and the state that the peristome of guiding ditch 106d ' on being formed on shell 106 aligns, insert composite optical component 105 from the installation pit hole 106b of shell 106, with not shown needed anchor clamps, compress the surface except that the diffraction grating 105h of plane of incidence 105a equably, thus, this matrix part 105c embeds in the accommodating chamber 106c.Then, touch in the stage of the face that the contacts 106c ' among the accommodating chamber 106c that is formed on shell 106, finish the location of central shaft N ' direction shell 106 in the outer edge of exit facet 105b.
At this moment, the cylindrical portion 105j that is located on the matrix part 105c is entrenched on the first restriction receiving portion 106j of accommodating chamber 106c, therefore, face of cylinder 105j ' (the restriction face of the cylindrical portion 105j of matrix part 105c, with reference to Figure 19) touch on the first restriction receiving portion 106j, finished accurately with the position limit of the direction of optical axis N quadrature in the leading section of matrix part 105c.And meanwhile, the rearward end 105k of matrix part 105c 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, each teat 105k ' that is formed on the outer peripheral face of rearward end 105k becomes the state that evenly compresses respectively, the top end face (restriction face) of each teat 105k ' contacts with the second restriction receiving portion 106k, finished accurately with the position limit of the direction of central shaft N ' quadrature among the rearward end 105k of matrix part 105c, simultaneously, prevented the disengaging of composite optical component 105 from accommodating chamber 106c.And, by composite optical component 105 is embedded the installation pit hole 106b that is located on the shell 106, the position limit teat 105m that is formed on the composite optical component 105 is directed among the guiding ditch 106d ' that is formed in the shell 106, be embedded into position limit ditch 106d, therefore, finished accurately around the position limit of the sense of rotation of central shaft N '.
Like this, the composite optical unit 101 of present embodiment, not only can embed shell 106 to composite optical component 105, and can carry out the position limit of the central shaft N ' direction of 105 pairs of shells 106 of composite optical component, with the position limit of the direction of central shaft N ' quadrature, around the position limit of the sense of rotation of central shaft N ', therefore, can easily and carry out the assembling of composite optical unit 101 accurately.And, the composite optical unit 101 of present embodiment, with composite optical component 105 in the recessed formation spatial portion of the corresponding part of the formation portion 105s of teat 105k ', therefore, in the time of on the top end face (restriction face) of each teat 105k ' being touched the second restriction receiving portion 106k, the formation portion of each teat 105k ' is in spatial portion 105s side elastic deformation, thus, it is pressed into power and is relaxed, can prevent to surpass the necessary masterpiece that is pressed into uses on the composite optical component 105, can prevent the distortion of optical function portion, the particularly second diffraction grating 105g and the three beams distortion of diffraction grating 105h.
Two long wavelength laser diodes 102 insert the 102e of its cap portion (with reference to Fig. 2) in the accommodating chamber 106a of shell 106, matrix part 102a are embedded be formed on the shell 106 among the 106b of installation pit hole, thus, are 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 and automatically align with the central shaft N ' of shell 106, can make from two long wavelength laser diodes, 102 emitted laser be injected into composite optical component 105 plane of incidence 105a in the heart, therefore, can be shaped as circle to the some shape of laser.
Photosensitive-member 104 as Figure 18 and shown in Figure 20, is installed on the shell 106 by printed circuit board (PCB) 107.The installation of 104 pairs of printed circuit board (PCB)s 107 of this photosensitive-member is carried out like this: the sensitization window 104b ' side of handle component 104b is passed the through hole 107a that is located on the printed circuit board (PCB) 107, external connection terminals 104c is clamped to be formed on the printed circuit board (PCB) 107 lip-deep clamping parts (not shown).And, can bond on printed circuit board (PCB) 107 or the shell 106 with bonding agent handle component 104b is firm as required.And, the fixing printed circuit board (PCB) 107 of photosensitive-member 104, under the relative state of position limit ditch 106d on being configured to sensitization window 104b ' and being formed on shell 106, be carried on installation portion 106h, each installed surface 106h ' of 106i, on the 106i ', carry out screw fixed with bolt 108, and be fixed on the shell 106.And, carry the printed circuit board (PCB) 107 of photosensitive-member 104, when passing through predetermined benchmark optical system from light source 103a, the laser 103a ' that 103b is emitted, when the pairing back light from CD of 103b ' carries out diffraction by the first diffraction grating 105f and the second diffraction grating 105g in advance, be adjusted on the precalculated position P that the most suitably is directed to photo-sensitive cell 104a, then, be fixed on installed surface 106h ', on the 106i '.
The playback of Digital video disc 62 that optical take-up apparatus 100 is carried out and compact disc 61 action describes below.
In the above-described configuration, when playback Digital video disc 62, as shown in figure 18, the three beams that the laser 103a ' that penetrates from the light source 103a of two long wavelength laser diodes 102 sees through on the plane of incidence 105a that is formed on composite optical component 105 is transformed to three beams with diffraction grating 105h, then, see through the first diffraction grating 105f, penetrate from exit facet 105b.
Then, this laser 103a ' is by being configured to become the catoptrons 300 of 45 degree to make its angle deflection 90 degree with the direct of travel of laser 103a ', and injects in the parallel light tube lens 400 of the top that is configured in catoptron 300.Then, the laser 103a ' that becomes almost parallel light by these parallel light tube lens 400 injects object lens 200.Optically focused effect by object lens 200 is imaged on the information recording surface of Digital video disc 62.
Then, see through object lens 200 once more by 62 laser light reflected of Digital video disc (back light) 103a ', and through parallel light tube lens 400, reflected by catoptron 300, then, inject and be formed on the back light plane of incidence shown in Figure 180 and promptly be formed on the first diffraction grating 105f on the exit facet 105b, become the back light 103a '-2 of a diffraction light that is diffracted into predetermined angle of diffraction.The back light reflecting surface 105d that back light 103a '-2 then is formed on the composite optical component 105 reflects, and incides among the 105i of the face of cylinder, penetrates from back light exit facet 105p.And the back light 103a '-2 of ejaculation (with reference to Figure 10, Figure 13), and incides on the photosensitive sites P among the photo-sensitive cell 104a of photosensitive-member 104 by position limit ditch 106d.
At this moment, the back light 103a '-2 that is accepted by photo-sensitive cell 104a is carried out light-to-current inversion, thus, by the corresponding electric current output transform of the handle and the signal of the information recording surface of Digital video disc 62 is that voltage signal generates replay signal, be output from the external connection terminals 104b of photosensitive-member 104, be transmitted to the outside by printed circuit board (PCB) 107.And the part of the back light 103a '-2 that is accepted by photo-sensitive cell 104a is used to focus on and tracking Control.
On the other hand, when playback compact disc 61, the laser 103b ' that penetrates from the light source 103b of two long wavelength laser diodes 102, as shown in figure 18, the three beams that sees through on the plane of incidence 105a that is formed on composite optical component 105 is transformed to three beams with diffraction grating 105h, then, see through the first diffraction grating 105f, penetrate from exit facet 105b.Then, this laser 103b ' identical object lens 200 that are transmitted to during with Digital video disc 62, the optically focused effect by object lens 200 is 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 200, parallel light tube lens 400 once more, and is reflected by catoptron 300, then, inject the first diffraction grating 105f, become the back light 103b '-2 of a diffraction light that is diffracted into predetermined angle of diffraction.Back light 103b '-2 then is formed on the back light reflecting surface 105d on the composite optical component 105 " reflect, inject face of cylinder 105i.In the 105i of the face of cylinder, back light 103b '-2 is provided for the method for astigmatism of focus control, penetrates back light exit facet 105p, and (with reference to Figure 10, Figure 13), and is accepted by the photosensitive sites P among the photo-sensitive cell 104a by position limit ditch 106d.At this moment, the back light 103b '-2 that is accepted by photo-sensitive cell 104a is carried out light-to-current inversion, thus, by the corresponding electric current output transform of the handle and the signal of the information recording surface of compact disc 61 is voltage signal, and the formation replay signal, be output from the external connection terminals 104b of photosensitive-member 104,, be transmitted to the outside by printed circuit board (PCB) 107.And the part of the back light 103b '-2 that is accepted by photo-sensitive cell 104a is used to the tracking Control that focus control that method of astigmatism carries out and three beams are carried out.
And, in optical take-up apparatus 100, the laser 103a ' that restriction is penetrated from composite optical component 105 can be set, the wavelength optical filtering of the diameter of the light beam of 103b ' etc. in the light path between exit facet 105b and the object lens 200.
Below the function that comprises each diffraction grating 105f, 105g, 105h in the composite optical component 105 is described.
As shown in figure 20, with the laser 103a ', the 103b ' that penetrate from the exit facet 105b of composite optical component 105 corresponding respectively from the back light of Digital video disc 62 and compact disc 61 respectively by the first diffraction grating 105f institute diffraction that is formed on the exit facet 105b, and become back light 103a '-2 and back light 103b '-2.At this moment, owing to be longer than wavelength corresponding to the back light 103a '-2 of Digital video disc 62 corresponding to the wavelength of the back light 103b '-2 of compact disc 61, therefore, the angle of diffraction of back light 103b '-2, angle of diffraction greater than back light 103a '-2 (is utilized such principle: in diffraction grating, wavelength is long more, and angle of diffraction is big more).
And, utilize the poor of this angle of diffraction, make before diffracted that distance be the state of D between laser 103a ', 103b ' optical axis separately, as back light 103a '-2, back light 103b '-2 arrival back light reflecting surface 105d " time, both in-positions are consistent.
But, back light reflecting surface 105d at composite optical component 105 " in; back light 103a '-2, back light 103b '-2 are reflected simply; because the incident angle difference of both sides' laser, 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, at back light reflecting surface 105d " on the second diffraction grating 105g is set.Promptly, back light 103a '-2 and back light 103b '-2 poor by the different angle of diffraction that produce of wavelength once more among the second diffraction grating 105g incided in utilization, makes by back light reflecting surface 105d " the back light 103a '-2 of reflection and back light 103b '-2 both sides' optical axis be consistent.
Like this, can be respectively the back light 103a '-2 of institute's diffraction and back light 103b '-2 proofread and correct to being accepted by the photosensitive sites P of photo-sensitive cell 104a by the first diffraction grating 105f, even use light source 103a, the 103b of 2 wavelength, also can accept both sides' laser with photosensitive-member 104 with a photo-sensitive cell 104a.
As described above, according to present embodiment, as shown in figure 18, has 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 composite optical component 105, two long wavelength laser diodes 102 have the laser diode 103a of the short wavelength laser used of emission Digital video disc and the long wavelength laser diode 103b that the emission compact disc is used, composite optical component 105 is provided with: the plane of incidence 105a of the light incident of penetrating from two long wavelength laser diodes 102 and the exit facet 105b of ejaculation, the back light that is reflected by the CD D1 (D2) that is located on the exit facet 105b is carried out the first diffraction grating 105f of diffraction, back light by the first diffraction grating 105f institute diffraction is reflexed to reflecting surface 105d on the photosensitive-member 104, simultaneously in that also to be provided with the optical axis that makes the different light of wavelength on the reflecting surface 105d consistent and be imaged onto the second diffraction grating 105g on the photosensitive sites P of photosensitive-member 104, therefore, the enough composite optical units 101 of energy are suitable for using the optical take-up apparatus 100 of two different wave lengths.And photosensitive-member 104 can be one, can only adjust this photosensitive-member 104 and carry out the position cooperation, therefore, the cost of adjusting in the operation is increased.And, make from the exit facet 105b of the emitted laser of two long wavelength laser diodes 102 and incident the back light plane of incidence to be on the same level from the back light of CD, therefore, put from this, can simplify formation.
And, two long wavelength laser diodes 102 are by matrix part 102a, the assembly that constitutes by 102e of cap portion and glass plate 102f, constitute from the outstanding external connection terminals 102g that is provided with of matrix part 102a, photosensitive-member 104 is by the assembly 104b of built-in photo-sensitive cell 104a and is located at the so-called discrete parts that the external connection terminals 104c on this assembly 104b is constituted, use respectively and constitute composite optical unit 101 with the cheap parts of making of monomer, therefore, it is easy that the processing of each parts becomes, and, assembling work to shell 106 becomes easily, can reduce component costs and processing charges.
And, resin material with cheapness forms composite optical component 105, simultaneously, when composite optical component 105 moulding, the integrally formed first and second diffraction grating 105f of while, 105g, three beams diffraction grating 105h, face of cylinder 105i, therefore, molding time can shorten, and can further reduce the manufacturing cost of composite optical component 105.
And, owing in composite optical component 105, comprise light-beam forming unit integratedly, therefore, the waste that shines the laser power on the CD can be reduced, and the light picker of the optical disc apparatus of the laser power that for example needs such as Digital video disc device are bigger can be suitable for.And, light-beam forming unit with from the plane of incidence 105a of the emitted laser of two long wavelength laser diodes 102, penetrate from two long wavelength laser diodes 102 emitted laser and incident and form from the exit facet 105b of the back light of CD, the reflecting surface that the back light from CD is transmitted on the photosensitive-member, therefore, do not need mutually adjusting of various piece, can seek the summary of the miniaturization and the assembling of composite optical unit.And, make the plane of incidence 105a of composite optical component 105 form columniform concave surface, simultaneously, make the exit facet 105b of this composite optical component 105 form the curvature columniform convex surface different with above-mentioned plane of incidence 105a, thus, light-beam forming unit is provided for composite optical component 105, therefore, can be easily and implement at an easy rate to make and design.
Below, the 4th embodiment of composite optical unit involved in the present invention is described according to Figure 21.
As shown in figure 21, this routine composite optical component 105, plane of incidence 105a forms the dip plane with respect to the optical axis N inclination of laser, exit facet 105b forms with respect on the vertical plane of central shaft N ', so that the vergence direction from the minor axis direction of the emitted laser of two long wavelength laser diodes 102 towards plane of incidence 105a and carry out incident, thus, can be shaped as circle to some shape from the emitted laser of exit facet 105b.Promptly, as described above, owing to be shaped as ellipse from the point of the emitted laser of two long wavelength laser diodes 102, then by making its minor axis direction carry out incident towards the vergence direction of plane of incidence 105a, thus, with the laser light incident side configuration triangular prism that parallels formed composite optical component at the plane of incidence with exit facet 105b, the situation that laser is incided in this triangular prism obliquely is identical, can be shaped as circle to the some shape of the laser that penetrates from exit facet 105b.
Plane of incidence 105a is with respect to the tilt angle theta of exit facet 105b, is m and the refractive index that constitutes 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, accommodating chamber 106c with respect to composite optical component 105, the accommodating chamber 106a of two long wavelength laser diodes 102 is obliquely installed, in accommodating chamber 106a, insert the 102e of cap portion of two long wavelength laser diodes 102, in the 106b of installation pit hole, embed the matrix part 102a of two long wavelength laser diodes 102, thus, can make from the plane of incidence 105a of the emitted laser of two long wavelength laser diodes 102, carry out incident with the needed incident angle that obtains needed beam shaping effect with respect to composite optical component 105.
For other parts, since identical with the related composite optical unit 101 of the 3rd embodiment with composite optical component 105, therefore, corresponding part is used same numeral and omitted its explanation.
This routine composite optical unit 101 and composite optical component 105 are except having the effect identical with the related composite optical unit 101 of the 3rd embodiment and composite optical component 105, as the beam shaping parts, the plane of incidence 105a that makes composite optical component 105 tilts with respect to the incident direction from the emitted laser of two long wavelength laser diodes 102, therefore, the composite optical component 105 with high-precision beam shaping function can be easily made in design and easy to manufacture.
In addition, in the above-described embodiments, use to have two different light source 103a of wavelength, two long wavelength laser diodes 102 of 103b are as luminous component, but, also can use the luminous component that only comprises a light source, also can use luminous component with the different light source more than 3 of wavelength.

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 beam shaping parts, be used for above-mentioned photosensitive-member is installed on the printed circuit board (PCB) of above-mentioned shell, above-mentioned composite optical component, following part is provided with integratedly, that is: from the plane of incidence of the emitted laser of above-mentioned luminous component, inject the exit facet of the laser of the above-mentioned plane of incidence towards the CD ejaculation, 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, back light by above-mentioned diffraction instrument institute diffraction is transmitted to the reflecting surface of above-mentioned photosensitive-member.
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, it is characterized in that, following part is provided with integratedly, that is: from the plane of incidence of the emitted laser of luminous component, inject the exit facet of the laser of the above-mentioned plane of incidence towards the CD ejaculation, 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, back light by above-mentioned diffraction instrument institute diffraction is transmitted to the reflecting surface of above-mentioned photosensitive-member, to be shaped as circular light-beam forming unit from the some shape of the emitted laser of above-mentioned luminous component.
8. composite optical component according to claim 7 is characterized in that, as above-mentioned light-beam forming unit, when the above-mentioned plane of incidence is formed columniform concave surface, above-mentioned exit facet is formed 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)

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

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CN1177320C true 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
CN114300931A (en) * 2021-12-06 2022-04-08 武汉锐科光纤激光技术股份有限公司 Heat radiator for laser chip

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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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