CN1167063C - Laser head device - Google Patents
Laser head device Download PDFInfo
- Publication number
- CN1167063C CN1167063C CNB011439750A CN01143975A CN1167063C CN 1167063 C CN1167063 C CN 1167063C CN B011439750 A CNB011439750 A CN B011439750A CN 01143975 A CN01143975 A CN 01143975A CN 1167063 C CN1167063 C CN 1167063C
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- frame
- mentioned
- equipped section
- side wall
- head assembly
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- Optical Head (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
To provide the constitution of an optical head device in which deficiencies such as positional deviation and posture inclination of optical parts mounted on a frame made of resin do not occur even if temperature change occurs for the frame. In the frame 3 made of resin used for the optical head device 1, local expansion, shrinkage or the like do not occur even when temperature change occurs for the frame 3, since any of the inner side 335 of the frame sidewall 331 of a prism mounting part and a cylindrical projecting part 370 to which a holder supporting member is adhered and fixed is made uniform by holes 51 and 52.
Description
Technical field
The invention relates to record, the used laser head assembly of regeneration of a kind of CD (Zip disk) and DVD optical recording medias such as (digital video disks).More particularly, be exactly about carrying the gantry configuration of optics in the laser head assembly.
Background technology
The record of optical recording media such as CD and DVD, the used laser head assembly of regeneration system import object lens by light-conducting system with the light that light source penetrates, and this object lens convergent light is converged on optical recording media.At this moment, drive object lens by lens driver to tracking direction and focus direction.About the light that from optical recording media, returns, still by light-conducting system lead-in light sensing device.Here, the various opticses that constitute light-conducting system carry assigned position on frame with light source and photosensitive device etc.
As frame, used the metallic frame in the past always, but, adopted resin system frame at present for alleviating the weight of laser head assembly and reducing cost.On this resin system frame, be provided with the optics equipped section of carrying a plurality of opticses.In these optics equipped sections, on prism equipped section 330 as shown in Figure 4, the side butt of the prism 22 (optics) of cube shaped also is positioned the medial surface of frame side wall 331.
Here, from inboard stravismus finding frame side wall 331 as shown in Figure 8, the inboard 335 of frame side wall 331 and the form fit that places the pillar of disk drive side are caved in into circular-arc.
Again, near prism equipped section 330, as shown in Figure 4, the scioptics frame disposes and can support object lens along tracking direction and columnar holding components 35 moving of focusing direction.Therefore, cylindrical projection 370 is outstanding upward from frame side wall 331, and this cylindrical projection 370 separates the formation circle with the frame holding components equipped section 250 that other protuberances will dispose frame holding components 35.The Lower Half of the frame holding components 35 frame holding components equipped section 350 of packing under this state, is applied in 370 of the side of frame holding components 35 and cylindrical projection with bonding agent.
Like this, on prism equipped section 330, the xsect of frame side wall 331 is shown in Fig. 9 (A), the inner face of the frame side wall 331 of the side institute butt of prism 22 forms tabular surface, its inboard 335 (outside) is caved in into circular-arc, so the frame side wall 331 of 22 butts of prism is thickening on the whole, and its thickness is different under different situations.Cylindrical projection 370 with frame holding components equipped section 350 separate form circular, and with fixedly connected this holding components 35, thus the xsect of cylindrical projection 370 shown in Fig. 9 (B), thickening on the whole, and its thickness is according to circumstances and difference.
The problem that the resin system frame 3 of this kind structure exists is: compare with other parts, the resin of thickness portion acutely expands, shrinks, so in the prism equipped section 330 that frame side wall 331 thickens, along with temperature variation, 331 ones of the frame side walls of 22 butts of prism, degradation distortion under the verticality can take place, and causes prisms tilted.
In addition, if above frame side wall 331, be provided with thick cylindrical projection 370 again, the influence that is subjected to this cylindrical projection 370 to expand, shrink, the verticality that the frame side wall of 22 butts of prism is 331 ones descends more remarkable.
In view of the above problems, problem of the present invention is, a kind of like this laser head assembly of structure is provided, and changes even carry the resin system frame temperature of optics, also can not cause faults such as the offset of optics of lift-launch and attitude inclination.
Summary of the invention
For solving above-mentioned problem, the present invention is a kind of like this laser head assembly, is provided with in this device: light source, and the light pinching that driving will be penetrated from this light source is in the lens driver of the object lens of optical recording media; The photosensitive device of the light that reception is returned from optical recording media; Above-mentioned light source is penetrated light be directed to object lens, will import a plurality of opticses of above-mentioned photosensitive device from the light that optical recording media returns simultaneously; Carry the frame of these a plurality of opticses, above-mentioned light source, said lens drive unit and above-mentioned photosensitive device.It is characterized in that, a plurality of opticses equipped section in the above-mentioned frame of carrying above-mentioned a plurality of opticses respectively, at least to be provided with an optics equipped section, described optics equipped section forms porose by the inboard of the frame side wall that carries the optics institute butt on it, and makes this frame side wall thickness average.
If the resin system frame additional temp of laser head assembly is changed, then to compare with other parts, violent expansion, contraction can take place in the resin on thick rack section, and its stress is concentrated, and the shape etc. of optics equipped section is easily changed.And in the present invention, owing to form porosely in the inboard with the frame side wall of optics butt, frame side wall thickness is even, and thus, even resin frame occurrence temperature changes, local expansion, contraction can not take place frame side wall yet.Thereby, the optics high precision can be installed on the frame.Therefore, laser head assembly has stable properties.The hole also has the effect that prevents that the resin frame from shrinking when being shaped.
In the present invention, the uniform optics of above-mentioned thickness equipped section is the prism equipped section of the above-mentioned frame side wall of prism side butt.
In the present invention, in the uniform optics of above-mentioned thickness equipped section, cylindrical projection is when the sidewall of the above-mentioned frame of optics butt extends upward, preferably inboard to the inboard of above-mentioned cylindrical projection from above-mentioned frame side wall forms the hole continuously, thereby the thickness of the thickness of above-mentioned frame side wall and above-mentioned cylindrical projection is even.If adopt this kind structure, even resin frame occurrence temperature changes, differential expansion, contraction etc. can not take place in cylindrical projection yet.Therefore, can not be subjected to the expansion of cylindrical projection, the influence of contraction, degradation distortion under the frame verticality of side wall take place, so laser head assembly has stable properties.
In the present invention, above-mentioned cylindrical projection separates when forming frame holding components equipped section, that is: in the said lens drive unit, the scioptics frame, separate when forming the frame holding components equipped section can be used for carrying the frame holding components of supporting that above-mentioned object lens move in tracking direction and focusing direction, above-mentioned holding components of this holding components equipped section made relative fixed to above-mentioned cylindrical projection with bonding agent.Adopt this kind structure, even resin frame occurrence temperature changes, the cylindrical projection of the frame holding components that is adhesively fixed can not deform etc. yet, so can support object lens often to be in optimum condition, therefore, laser head assembly has stable properties.
Description of drawings
Fig. 1 is the planimetric map of laser aid significant points that carries out the record regenerating of CD, CD-R and DVD.Fig. 2 (A), (B), (C), (D) are respectively planimetric map, left side view, right side view and the ground plan of laser head assembly shown in Figure 1.Fig. 3 (A), (B), (C), (D) are respectively planimetric map, left side view, right side view and the ground plan of laser head assembly shown in Figure 1 with resin system frame.Fig. 4 is for being located at the oblique view of the prism equipped section on the resin system frame from Fig. 3 (A) arrow directions X finding.Fig. 5 (A), (B) are respectively from the oblique view and the side view of inboard (direction shown in the arrow Y direction of Fig. 3 (A)) finding prism shown in Figure 4 equipped section.Cross-sectional view when Fig. 6 (A), (B) cut off the frame side wall of prism equipped section for the A-A ' line position that is presented at Fig. 5 (B), and the cross-sectional view when the B-B ' line position of figure (B) cuts off from the prism equipped section outstanding upward cylindrical projection.Fig. 7 is suitable for the key diagram of used other the resin system frames of laser head assembly for the present invention.Fig. 8 is in the resin system frame that adopts in the present laser head assembly, the amplification oblique drawing of finding prism equipped section outside the resin system frame.Fig. 9 (A), (B) are the cross-sectional view when cutting off prism equipped section frame side wall in the resin system frame shown in Figure 8, the cross-sectional view when cutting off from the prism equipped section outstanding upward cylindrical projection.
The invention embodiment
Below, with reference to drawing, illustrate to be suitable for laser head assembly of the present invention.
Fig. 1 is the planimetric map of laser aid significant points that carries out the record regenerating of CD, CD-R and DVD.Fig. 2 (A), (B), (C), (D) are respectively planimetric map, left side view, right side view and the ground plan of laser head assembly shown in Figure 1.Fig. 3 (A), (B), (C), (D) are respectively planimetric map, left side view, right side view and the ground plan of laser head assembly shown in Figure 1 with resin system frame.
As Fig. 1, Fig. 2 and shown in Figure 3, laser head assembly 1 is provided with resin system frame 3.This frame 3 thus, can move along axis of guide 2A, 2B by 2 axis of guide 2A, 2B perforation connecting portions 301,302,303 that relative machine is parallel to each other and installs.This axis of guide 3 is provided with optical system as described below.
The optical system of laser head assembly 1 is provided with the DVD laser diode that penetrates the 1st laser L1, the CD laser diode 5 that penetrates the 2nd laser L2, common light path 6 can lead the 1st and the 2nd laser L1, the L2 that penetrates from each laser diode 4,5, utilize this common light path 6, carry out the record regenerating of CD, CD-R and DVD.
Common light path 6 is provided with photosensitive device 11, sensing lens 10, light-conducting system 20, collimation lens 7 and rising mirror 8 that is equipped on the frame 3 and the object lens 9 that are arranged in rising mirror 8 tops.
DVD is used for the DVD record regenerating with laser diode 4, penetrates the 1st laser L1 of wavelength 650nm or 635nm.CD is CD and CD-R record regenerating usefulness with laser diode 5, penetrates the 2nd laser L2 of wavelength 780～ 800nm.Laser diode 4,5 is arranged in the same side of common light path light-conducting system, and optical axis L 10, L11 are parallel to each other.In illustrated example, compare DVD laser diode 4 more close photosensitive device 11 sides with laser diode 5 with CD.
Directly inject light-conducting system 20 from DVD with the 1st laser L1 that penetrates the laser diode 4.On the other hand, inject in the light-conducting system 20 by diffraction grating with the 2nd laser L2 that penetrates the laser diode 5 from CD, diffraction grid 12 has the diffraction characteristic of regulation, will be divided into 3 road light beams with the 2nd laser L2 that penetrates the laser diode 5 from CD.
Here, DVD is installed is adhesively fixed on the side 317 of frame 3 by bonding agent with the printed circuit board (PCB) 410 of laser diode 4, and, be stamped seal closure 60 on this printed circuit board (PCB) 410.Thus, DVD is disposed at the intake section in the hole 305 on the resin frame 3 with laser diode 4, by this hole 305, with the 1st laser L1 directive light-conducting system 20.Being installed with CD is adhesively fixed on the side 316 of resin frame 3 with the heat sink 40 of laser diode 5.Thus, CD sees through this hole 306 with the intake section of laser diode 5 configuration with the hole 306 on the resin frames 3, by diffraction grating 12 with the 2nd laser L2 directive light-conducting system 20.
Light-conducting system 20 is made of the semi-transparent semi-reflecting lens 21 that is provided with part reflecting face, the prism 22 that is provided with part reflecting face.10 one-tenth 45 degree of the optical axis L of the 1st laser L1 that semi-transparent semi-reflecting lens 21 its part reflecting faces penetrate from laser diode 4 relatively tilt.20 one-tenths 45 degree inclinations of optical axis L of the 2nd laser L2 that prism 22 part reflecting faces penetrate from laser diode 5 relatively.
In this routine laser head assembly 1 of this kind structure, the DVD that injects semi-transparent semi-reflecting lens 21 is with the 1st laser L1, and by the part reflecting face of semi-transparent semi-reflecting lens 21, closely the light composition of half is reflected, and reflected light optical axis crooked 90 is spent, and injects the part reflecting face of prism 22.And the major part of injecting the laser L1 of this part reflecting face can be thoroughly to rising catoptron 8.On the other hand, the CD that injects prism 22 is with the part reflecting face of the 2nd laser L2 by prism 22, and closely the light composition of half is reflected, and crooked 90 degree of its optical axis are injected rising catoptron 8.All be imported into common light path 6 by the light-conducting system 20, the 1 that constitutes by above-mentioned semi-transparent semi-reflecting lens 21 and prism 22 and the 2nd laser L1, L2.
The DVD that imports common light path 6 by light-conducting system 20 after the reflection of rising catoptron 8 right angles, becomes parallel beam by collimation lens 7 with laser L1 and CD laser L2.The laser L1, the L2 that become parallel beam are imported into object lens, and by these object lens 9, DVD becomes the light groove with laser L1 at optical recording media DVD record surface optically focused.CD becomes the light groove with laser L2 at the record surface optically focused of optical recording media CD or CD-R.
The back light of optical recording media laser light reflected L1, L2 returns object lens 9, collimation lens 7 and rising catoptron 8, returns light-conducting system 20 once more.In these back lights, DVD is back to semi-transparent semi-reflecting lens 21 with the part reflecting face that the major part of the back light of laser L1 sees through prism 22.Half sees through the part reflecting face of semi-transparent semi-reflecting lens 21 and injects sensing lens 10.CD returns semi-transparent semi-reflecting lens 21 with half part reflecting face through prism 22 of the back light of laser L2, and injects sensing lens 10 through the reflecting surface of semi-transparent semi-reflecting lens 21.Then, each back light is concentrated on common photosensitive device 11 by sensing lens 10.Sensing lens 10 produce the lens of astigmatism for laser L1, the L2 that makes both sides.
In this example, sensing lens 10 are disposed at the exit portion in the hole 307 on the resin system frame 3, can detect by this hole 307, see through the light of semi-transparent semi-reflecting lens 21.And at the rear of sensing lens 10, the circuit board 110 that photosensitive device 11 is housed is adhesively fixed on the side 311 of resin system frame 3, thus, photosensitive device is equipped on the resin system frame 3.
In the laser head assembly 1 of this kind structure, be provided with the lens mount 71 of maintenance object lens 9 at the objective lens device 70 of focusing direction and tracking direction driving object lens 9.The cylindrical bearing portion 73 that this lens mount 71 is provided with housing 72 cylindraceous and is located at these housing 72 inboards.Housing 72 is driven with coil 81 and a pair of focusing driving by a pair of tracking and constitutes with coil 82.
Being fixed on the diapire of the frame holding components 35 on the resin frame 3 uprightly has fulcrum 91, and this fulcrum 91 inserts the inboard of the bearing portion 73 of lens mounts 71.Frame holding components 35 is provided with outer wall 356 and inwall 357, is equipped with and follows the tracks of a pair of tracking magnet 83 with drive coil 81 face-offs, formation tracking magnetic circuit on the outer wall 356.Therefore, with lens mount 71 rotation around fulcrum 91, can revise tracking error.
On the outer wall 356, relative focusing is provided with a pair of focusing magnet 84 that constitutes the focusing magnetic circuit with drive coil 82.Therefore, lens mount 71 along the moving axially of fulcrum 91, can be revised error of focusing.
Lens mount 71 is connected with the flex plate 77 that blinds board 359 centre positions of frame holding components 35 are supported.Be coated with above the frame holding components 35 and cover 355.(with reference to Fig. 2 (A))
(special tectonic of resin system frame)
Fig. 4 is for being located at the oblique view of the prism equipped section on the resin system frame from Fig. 3 (A) arrow directions X finding.Fig. 5 (A), (B) are respectively from the oblique view and the side view of inboard (direction shown in the arrow Y direction of Fig. 3 (A)) finding prism shown in Figure 4 equipped section.Cross-sectional view when Fig. 6 (A), (B) cut off the frame side wall of prism equipped section for the A-A ' line position that is presented at Fig. 5 (B), and the cross-sectional view when the B-B ' line position of figure (B) cuts off from the prism equipped section outstanding upward cylindrical projection.
In this form laser head assembly 1, resin system frame 3 is provided with a plurality of opticses equipped section of a plurality of opticses such as carrying prism 22 and semi-transparent semi-reflecting lens 21 respectively, in these optics equipped sections, the prism equipped section as shown in Figure 4, the side butt of the prism 22 (optics) of cube shaped also is positioned the inner face of frame side wall 331.Here, the inboard 335 of the frame side wall 331 of 22 butts of the prism shape that is disposed at the disk drive lateral brace caves in into circular-arc.
Near prism equipped section 330, dispose scioptics frame 71, can support the cylindrical shape frame holding components 35 that object lens 9 tracking directions and focusing direction move.Therefore, cylindrical projection 370 is outstanding upward from frame side wall 331, and this cylindrical projection 370 is with other protuberances, and it is circular that the frame holding components equipped section 350 that disposes frame holding components 35 is separated formation.Here, frame holding components equipped section 350 holds the Lower Half of frame holding components 35, and 370 of the side of frame holding components 35 and cylindrical projection scribble bonding agent.
In the resin system frame 3 of this kind structure, prism equipped section 330 is shown in Fig. 5 (A) and Fig. 6 (A), the inner face of the frame side wall 331 of the side butt of prism 22 is smooth, its inboard 335 (outside) is caved in into circular-arc, so frame side wall 331 whole thickenings of prism 22 butts, and its thickness according to circumstances and different.
Shown in Fig. 5 (B) and Fig. 6 (B), cylindrical projection 370 plays following two kinds of effects, that is: frame holding components equipped section 350 is separated the effect that is formed into circle and is adhesively fixed frame holding components 35, so thickness thickens on the whole, and its thickness according to circumstances and different.
Therefore, if resin system frame 3 occurrence temperatures change, compare with other parts, thick frame side wall 331 and the resin in the cylindrical projection 370 expand, shrink violent, and stress is easily concentrated.And in this form, frame side wall 331 inboards 335 are provided with the hole 51 of rectangular aperture.Here, hole 51,52 connects into a hole 50 up and down.
Therefore, in the used resin system frame 3, even resin system frame 3 occurrence temperatures change, by the setting in hole 50 (hole 51,52), frame side wall 331 and cylindrical projection 370 thickness are even, so can not cause differential expansion and contraction in this form laser head assembly 1.Therefore, in resin system frame 3, even temperature takes place, stress can not concentrated, so degradation distortion under prism 22 butt frame side walls 331 verticality can not take place.Therefore, prism 22 can high installation accuracy be equipped on prism equipped section 330.The light that light source produces is suitably imported object lens 9, also lead-in light sensing device 11 suitably of the light that returns from optical recording media simultaneously, so resin frame 3 occurrence temperatures change, laser head assembly 1 also has stable properties.Hole 50 (hole 51,52) also has the effect of shrinking when preventing 3 shapings of resin frame.
The cylindrical projection 370 of being located at the frame side wall 331 of prism equipped section 330 is provided with the hole 52 that makes fixed thickness, so even resin system frame 3 occurrence temperatures change, differential expansion, contraction etc. do not take place cylindrical projection 370 yet.Therefore, can not be subjected to the expansion of cylindrical projection 370, the influence of contraction, degradation distortion under frame side wall 331 verticality of prism 22 butts can not take place yet.And, because cylindrical projection 370 is indeformable, so even utilize this cylindrical projection 370 fixed mount holding componentss 35, frame holding components 35 can not tilt yet.Therefore, can support object lens 9 to be in suitable state, so the optical characteristics of laser head assembly 1 can deterioration.
In above-mentioned form, the two-sided example that is provided with hole 51,52 of the inboard of the cylindrical projection 370 of extending upward to the inboard 335 of the frame side wall 331 of prism equipped section 330, from this frame side wall 331 is illustrated.As shown in Figure 7, also can be only be provided with and keep this uniform hole 51 of frame side wall 331 thickness in the inboard 35 of the frame side wall 331 of prism 22 butts.
In above-mentioned form, at prism 330 suitable example of the present invention has been described, resin system frame 3 is provided with a plurality of opticses equipped section, so the optics equipped section beyond the prism equipped section 330 also is applicable to the present invention.
As explained above such, if laser head assembly resin system frame occurrence temperature changes, compare with other parts, the expansion of the resin of thickness portion, contraction are acutely, optics equipped section shape etc. easily deforms, in the present invention, be provided with the hole, make frame side wall thickness even in the inboard of frame side wall.Even resin frame occurrence temperature changes, local expansion, contraction can not take place in frame side wall.Therefore, even resin system frame occurrence temperature changes, optics can high installation accuracy be equipped on the frame, so laser head assembly has stability characteristic (quality).The hole also has the effect of shrinking when preventing the shaping of resin frame.
Claims (4)
1. laser head assembly, described laser head assembly comprises: light source; The light pinching that driving will be penetrated from this light source is in the lens driver of the object lens of optical recording media; Be used to receive the photosensitive device of the light that returns from optical recording media; Above-mentioned light source is penetrated photoconduction to object lens, will import a plurality of opticses of above-mentioned photosensitive device from the light that optical recording media returns simultaneously; Be used to carry the frame of above-mentioned a plurality of optics, light source, lens driver and described photosensitive device, it is characterized in that:
On a plurality of opticses equipped section of the above-mentioned frame of carrying above-mentioned a plurality of opticses respectively, form porosely by the inboard at the frame side wall of the optics institute butt that carries, described laser head assembly comprises that at least one makes the average optics equipped section of this frame side wall thickness.
2. laser head assembly as claimed in claim 1 is characterized in that: the uniform optics of above-mentioned thickness equipped section is the prism equipped section that prism side is connected to above-mentioned frame side wall.
3. laser head assembly as claimed in claim 1 is characterized in that, on the uniform optics of above-mentioned thickness equipped section, cylindrical projection is extended upward from above-mentioned frame side wall,
The inside side from the inside side of above-mentioned frame side wall to above-mentioned cylindrical projection is formed with described hole continuously, makes the thickness of the thickness of above-mentioned frame side wall and above-mentioned cylindrical projection even.
4. laser head assembly as claimed in claim 3, it is characterized in that: above-mentioned cylindrical projection separates and forms frame holding components equipped section, described holding components equipped section is used for carrying the frame holding components at the said lens drive unit, described holding components scioptics frame, support above-mentioned object lens to move at the both direction of tracking direction and focusing direction
Simultaneously, above-mentioned the holding components that is disposed on this holding components equipped section is fixed with respect to above-mentioned cylindrical projection with bonding agent.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP392452/00 | 2000-12-25 | ||
| JP2000392452A JP2002197705A (en) | 2000-12-25 | 2000-12-25 | Optical head device and manufacturing method therefor |
| JP392452/2000 | 2000-12-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1365104A CN1365104A (en) | 2002-08-21 |
| CN1167063C true CN1167063C (en) | 2004-09-15 |
Family
ID=18858440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011439750A Expired - Fee Related CN1167063C (en) | 2000-12-25 | 2001-12-25 | Laser head device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2002197705A (en) |
| CN (1) | CN1167063C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006053961A (en) * | 2004-08-09 | 2006-02-23 | Nidec Sankyo Corp | Optical head device |
| US20090328084A1 (en) * | 2006-09-04 | 2009-12-31 | Pioneer Corporation | Pickup apparatus |
-
2000
- 2000-12-25 JP JP2000392452A patent/JP2002197705A/en active Pending
-
2001
- 2001-12-25 CN CNB011439750A patent/CN1167063C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1365104A (en) | 2002-08-21 |
| JP2002197705A (en) | 2002-07-12 |
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