CN1232966C - Optical magnetic head - Google Patents
Optical magnetic head Download PDFInfo
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- CN1232966C CN1232966C CN 03140672 CN03140672A CN1232966C CN 1232966 C CN1232966 C CN 1232966C CN 03140672 CN03140672 CN 03140672 CN 03140672 A CN03140672 A CN 03140672A CN 1232966 C CN1232966 C CN 1232966C
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- laser
- photo detector
- light
- supervision
- magnetic head
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Abstract
An optical head device (1), a mirror (8) and the common photodetector (2) for monitor are arranged at positions deviated from a common optical path (10) for the 1st laser beam (L1) emitted from a laser diode (4) for DVD and the 2nd laser beam (L2) emitted from a laser diode (5) for CD. Since the mirror (8), the dielectric films of which are formed to be multilayered, reflects the 1st laser beam (L1) and the 2nd laser beam (L2) toward the photodetector (2) for monitor with different reflectivities according to wavelengths, the laser beams (L1) and (L2) are received by the photodetector (2) for monitor with the equivalent intensities. In this way, an optical head device is provided by which laser beams emitted from a plurality of laser beam sources with different wavelengths are detectable with identical intensity by a common photodetector for monitor.
Description
Technical field
The laser that the present invention relates to use 2 kinds of lasing light emitters to penetrate 2 kinds of corresponding respectively wavelength band zones writes down the light magnetic head apparatus of the record regenerating of the different optical recording media of form, particularly relates to the surveillance technology of the laser in this light magnetic head apparatus.
Background technology
There are substrate thickness, recording density etc. to write down forms different CD, CD-R and DVD etc. as optical recording media is known.In these optical recording medias, but when the DVD to high density recording carries out record regenerating, use the short wavelength laser of wavelength 650nM or 635nM, when CD and CD-R are carried out record regenerating, typically use the long wavelength laser of 760～800nM.Like this, for CD-R and DVD both sides being handled, must in device, carry the 1st lasing light emitter that can penetrate short wavelength laser and 2 kinds of lasing light emitters that can penetrate the 2nd lasing light emitter of long wavelength laser in advance with 1 light magnetic head apparatus.
But, when using the discrete optical system of 2 systems, compare with having single light source and single optical system, need a large amount of opticses certainly, so make the device maximization, price also can rise.For this reason, adopt that the light path of prism with part reflecting face etc. is synthetic to constitute the synthetic structure of light path with the short wavelength laser and the long wavelength laser of directive optical recording media with optical element.
In light magnetic head apparatus, even in some occasions that writes down to DVD or CD-R, also be by the laser that penetrates from the 1st lasing light emitter and the 2nd lasing light emitter is monitored, control the laser intensity that penetrates from the 1st lasing light emitter and the 2nd lasing light emitter according to the result of this supervision.
When carrying out this supervision, a kind of method that with photo detector the laser respectively from the 1st lasing light emitter and the ejaculation of the 2nd lasing light emitter is monitored by other supervision of branch is arranged, but this structure can make component costs rise.
For this reason, the structure of employing is on the position of separating from common optical pathways, is accepted the part of the 1st laser that penetrates from the 1st lasing light emitter with photo detector by shared supervision and the both sides of the part of the 2nd laser that penetrates from the 2nd lasing light emitter.
Yet, the 1st laser and the 2nd laser exist by the different problem of supervision light intensity that monitors with the photo detector detection because different or arrive and monitor with the light path of each laser before the photo detector and move towards different from the intensity of the 1st lasing light emitter and the output of the 2nd lasing light emitter.In the past, for example,, all can obtain equal output in any occasion that detects to the 1st laser and the 2nd laser by the loop of using with the signal correction of photo detector detection by monitoring is set.Like this, problem in the past is the monitoring circuit complex structure, and, poor according to the control response that monitors the result.
In view of the above-mentioned problems, the object of the present invention is to provide a kind of light magnetic head apparatus that can detect the ejaculation laser that a plurality of lasing light emitters send with photo detector, with the intensity that equates with different wave length by shared supervision.
Summary of the invention
To achieve these goals, light magnetic head apparatus of the present invention comprises: the 1st lasing light emitter that penetrates the 1st laser; Penetrate the 2nd lasing light emitter of the 2nd long laser of described the 1st laser of wavelength ratio; The synthetic optical element of using of light path of the 1st and the 2nd laser that will penetrate from the described the 1st and the 2nd lasing light emitter, the common optical pathways of direct light recording medium; And accept the part of described the 1st laser that penetrates from described the 1st lasing light emitter in the position of separating and the shared supervision photo detector of the part of described the 2nd laser that penetrates from described the 2nd lasing light emitter from described common optical pathways, it is characterized in that also having the strength balance adjusting gear that the described supervision of directive is adjusted with the strength balance of described the 1st laser of photo detector and described the 2nd laser.
Among the present invention, the both sides of the part of the 2nd laser of accepting the part of the 1st laser that penetrates from the 1st lasing light emitter with photo detector by shared supervision and penetrate from the 2nd lasing light emitter on the position of separating from common optical pathways are monitored directive by the strength balance adjusting gear and to adjust with the 1st laser of photo detector and the strength balance of the 2nd laser.Therefore, even the 1st laser and the 2nd laser are different or arrive and monitor with the light path of each laser before the photo detector and move towards different from the intensity of the 1st lasing light emitter and the output of the 2nd lasing light emitter, also equal with the supervision light intensity of photo detector detection by supervision.Like this, even to not making revisal by supervision with the signal that photo detector detects, any occasion that detects to the 1st laser or the 2nd laser also can obtain equal output.Thus, monitoring circuit is simplified the structure, and, can improve according to the control response that monitors the result.
Among the present invention, described strength balance adjusting gear is the branch light reflecting member, this minute light reflecting member described the 1st laser from the photo detector reflection to described supervision and the 2nd laser that for example leave from described common optical pathways with the reflectivity of different wave length.
Among the present invention, described strength balance adjusting gear also can use branch light transmission member, this minute the light transmission member see through described the 1st laser and the 2nd laser that leaves from described common optical pathways with the transmitance of different wave length with photo detector to described supervision.
In sum, among the present invention, the both sides of the part of the 2nd laser of accepting the part of the 1st laser that penetrates from the 1st lasing light emitter with photo detector by shared supervision and penetrate from the 2nd lasing light emitter on the position of separating from common optical pathways are monitored directive by the strength balance adjusting gear and to adjust with the 1st laser of photo detector and the strength balance of the 2nd laser.Therefore, even the 1st laser and the 2nd laser are different or arrive and monitor with the light path of each laser before the photo detector and move towards different from the intensity of the 1st lasing light emitter and the output of the 2nd lasing light emitter, by monitoring that the supervision light intensity with the photo detector detection is also equal.Like this, even to not making revisal by supervision with the signal that photo detector detects, any occasion that detects to the 1st laser or the 2nd laser also can obtain equal output.Thus, monitoring circuit is simplified the structure, and can improve according to the control response that monitors the result.
Description of drawings
Fig. 1 is the pie graph that the light magnetic head apparatus of the embodiment of the invention 1 is wanted portion.
Fig. 2 is the pie graph that the light magnetic head apparatus of the embodiment of the invention 2 is wanted portion.
Embodiment
Explanation is suitable for light magnetic head apparatus of the present invention with reference to the accompanying drawings.
[embodiment 1]
Fig. 1 is the pie graph that the light magnetic head apparatus of the embodiment of the invention 1 is wanted portion.
Among Fig. 1, this routine light magnetic head apparatus is used for CD, CD-R and DVD record regenerating, constitutes the optical system of following explanation on pedestal (not shown).
At first, in light magnetic head apparatus 1, optical system has the CD laser diode 5 (the 2nd lasing light emitter) that the DVD that penetrates the 1st laser L1 (short wavelength laser) uses laser diode 4 (the 1st lasing light emitter) and penetrates the 2nd laser L2 (long wavelength laser).DVD is used for the record regenerating of DVD with laser diode 4, penetrates the 1st laser L1 of wavelength 650nm or 635nm.CD is used for the record regenerating of CD and CD-R with laser diode 5, penetrates the 2nd laser L2 of wavelength 780～800nm.
In this example, optical system is synthetic by light path to be that prism 6 will be used the 1st laser L1 of laser diode 4 ejaculations and use common optical pathways 10 guiding of the 2nd laser L2 of laser diode 5 ejaculations to optical recording media D direction from CD from DVD with optical element.That is, the part reflecting face 60 of prism 6 inclined light shaft that is configured to the second laser L2 both sides that penetrate with laser diode 5 with respect to the 1st laser L1 that penetrates with laser diode 4 from DVD with from CD becomes 45 states of spending.
Sight lens (not shown) disposing with laser diode 5 to the light path of prism 6 from CD.This sight lens have fixed inflection characteristic, restrainted by being divided into 3 from the 2nd laser L2 that CD penetrates with laser diode 5, adopt known 3 wave beam methods or DPP method, can carry out trail-and-error and detect.
In this example, on common optical pathways 10, disposing prism 7 successively, sighting lens 12, object lens 13, described prism 7 is a kind ofly will see through the separation optical element of back directive photo detector 9 from the reflective part of optical recording media D.In these optical elements, prism 7 also is the state that part reflecting face 70 is configured to become with respect to the inclined light shaft of the laser L1, the L2 that penetrate from laser diode 4,5 45 degree.In addition, object lens 13 are carried on the lens holder of lens driver (not shown).In the side of prism 7 position configuration input photo detector 2 is arranged.
Again, shared supervision is arranged with photo detector 2, dispose catoptron 8 with the reverse side of the clamping common optical pathways 10 of photo detector 2 in this supervision relatively in the side of common optical pathways 10 position configuration.
The light magnetic head apparatus 1 of this structure is when when regeneration or record, and with the one partial reflection, another part sees through back guiding common optical pathways 10 and also injects prism 7 the 1st laser L1 that penetrates with laser diode 4 from DVD by the part reflecting face 60 of prism 6.Corresponding, the 2nd laser L2 that penetrates with laser diode 5 from CD sees through its part by the part reflecting face 60 of prism 6, and another part reflection back guiding common optical pathways 10 is also injected prism 7.
And, inject the part reflection of laser L1, the L2 of prism 7, another part sees through the back guiding and sights lens 12.Like this, laser L1, the L2 that guiding is sighted lens 12 is transformed to the object lens 13 that lead after the parallel beam, by these object lens 13, the 1st laser L1 that DVD uses is gathered in the record surface that optical recording media D is DVD as luminous point, and the 2nd laser L2 that CD uses then is gathered in the record surface that optical recording media D is CD or CD-R as luminous point.
During regeneration, by optical recording media D laser light reflected L1, L2 reflective via object lens 13 with sight lens 12 and be back to prism 7.And by the part reflecting face 70 of prism 7 with part reflection, its optical axis is flexed into 90 degree, detects with photo detector 14 by sensor leads (not shown) arriving signal.At this, because the lens that sensor leads is the reflective generation astigmatism of a kind of laser L1, L2 to both sides to be used, therefore, the laser L2's that laser L1 that the DVD that is detected by photo detector 14 uses and CD use is reflective by sensor leads generation astigmatism.As everyone knows, in photo detector 14, be pre-formed 4 and cut apart photo detector, thus, can carry out the optically focused revisal from these photoelectricity flows of cutting apart photo detector.
Like this, when recording of information is regenerated, separate arrival catoptron 8 with the part of the 2nd laser L2 of laser diode 5 ejaculations from common optical pathways 10 with the part of the 1st laser L1 of laser diode 4 ejaculations with from CD from DVD, by catoptron 8 reflection back directives supervision photo detectors 2.
Catoptron 8 is a kind of dichroic reflector (strength balance adjusting gears), is formed with the multilayer dielectric film on reflecting surface, with the reflectivity of different wave length the 1st laser L1 and the 2nd laser L2 is used photo detector 2 reflections to monitoring.That is, 8 couples the 1st laser L1 of catoptron reflect with its 85% efficient, and the 2nd laser L2 is reflected with 30% efficient.
During record,, then monitor and accept the 1st laser L1 with the intensity of 3.0mW with photo detector 2 in case penetrate the 1st laser L1 from DVD with laser diode 4 with the intensity of 70mW; With the intensity of 200mW when CD penetrates the 2nd laser L2 with laser diode 5, monitor and also accept the 2nd laser L2 with the intensity of 3.0mW with photo detector 2.
In the past, do not adopting catoptron 8 but adopted reflecting surface not have the catoptron occasion that constitutes by aluminium etc. of branch photosensitiveness, and monitoring and accept the 1st laser L1 with the intensity of 3.5mW, accepting the 2nd laser L2 with the intensity of 10mW with photo detector 2.
Like this, in this routine light magnetic head apparatus 1, the optical recording media of CD, CD-R that 4,5 pairs of records of 2 kinds of laser diodes form of having used DVD and CD, CD-R to use is different and DVD etc. carries out record regenerating, but also can be by prism 6,7, sight lens 12 and object lens 13 constitute common optical pathways 10, and the part of the 1st laser L1 that penetrates with laser diode 4 from DVD with 2 pairs of photo detectors by shared supervision and monitor with the part of the 2nd laser L2 of laser diode 5 ejaculations from CD.Thus, because of not needing the discrete optical system mechanism corresponding, can reduce significantly so constitute the quantity of the optical element of optical system with each laser diode 4,5.
And the 1st laser L1 is reflected to monitoring with photo detector 2 with different reflectivity respectively by catoptron 8 with the 2nd laser L2, and the result is monitoring that the 1st laser L1 equates with the intensity of the 2nd laser L2 with in the photo detector 2.Like this, by monitoring the supervision result who makes with photo detector 2, that no matter monitor is the 1st laser L1 or the 2nd laser L2, all can export equal signal under the state of not revisal.Thus, monitoring circuit is simplified the structure, and can improve according to the control response that monitors the result.
[embodiment 2]
Fig. 2 is the pie graph that the light magnetic head apparatus of the embodiment of the invention 2 is wanted portion.
Among Fig. 2, this routine light magnetic head apparatus is also the same with embodiment 1, is used for CD, CD-R and DVD record regenerating, constitutes the optical system of following explanation on pedestal (not shown).
In light magnetic head apparatus 1, optical system is the same with embodiment 1, has the CD laser diode 5 (the 2nd lasing light emitter) that the DVD that penetrates the 1st laser L1 (short wavelength laser) uses laser diode 4 (the 1st lasing light emitter) and penetrates the 2nd laser L2 (long wavelength laser).Again, optical system is synthetic by light path is that prism 6 will be used the 1st laser L1 of laser diode 4 ejaculations and use common optical pathways 10 guiding of the 2nd laser of laser diode 5 ejaculations to optical recording media D direction from CD from DVD with optical element.
On common optical pathways 10, disposing prism 7 successively, sighting lens 12, upright lens 15, object lens 13.
In these optical elements, prism 7 is the states that part reflecting face 70 are configured to become with respect to the inclined light shaft of the laser L1, the L2 that penetrate from laser diode 4,5 45 degree, in the side of prism 7 position configuration input photo detector 2 is arranged.
Again, the reverse side that detects with the clamping common optical pathways 10 of photo detector 14 at relative signal disposes wave filter 9 and shared supervision usefulness photo detector 14.
The light magnetic head apparatus 1 of this structure is when when regeneration or record, and with the one partial reflection, another part sees through back guiding common optical pathways 10 and also injects prism 7 the 1st laser L1 that penetrates with laser diode 4 from DVD by the part reflecting face 60 of prism 6.Corresponding, the 2nd laser L2 that penetrates with laser diode 5 from CD sees through its part by the part reflecting face 60 of prism 6, and another part reflection back guiding common optical pathways 10 is also injected prism 7.
And, inject a part of permeation parts reflecting surface 70 of laser L1, the L2 of prism 7, and lead and sight lens 12.Laser L1, L2 that guiding is sighted lens 12 are transformed to after the parallel beam, by upright lens 15 guiding object lens 13, by these object lens 13, the 1st laser L1 that DVD uses is gathered in the record surface that optical recording media D is DVD as luminous point, and the 2nd laser L2 that CD uses then is gathered in the record surface that optical recording media D is CD or CD-R as luminous point.
To this, separate from common optical pathways 10 by part reflecting face 70 laser light reflected L1, the L2 of prism 7, see through wave filter 9, and guiding monitors with photo detector 2.
Wave filter 9 is a kind of minute optical filters (strength balance adjusting gear), is formed with the multilayer dielectric film, with the transmitance of different wave length with the 1st laser L1 and the 2nd laser L2 to monitoring with photo detector 2 and seeing through.That is, 9 couples the 1st laser L1 of wave filter see through with 85% efficient, and the 2nd laser L2 is then seen through with 30% efficient.
During record, in case the intensity with 70mW penetrates the 1st laser L1 from DVD with laser diode 4, then monitor and accept the 1st laser L1 with the intensity of 3.0mW with photo detector 2, with the intensity of 200mW when CD penetrates the 2nd laser L2 with laser diode 5, monitor and accept the 2nd laser L2 with the intensity of 3.0mW with photo detector 2.
During regeneration, by optical recording media D laser light reflected L1, L2 reflective via object lens 13, upright lens 15 with sight lens 12 and be back to prism 7.Part reflecting face 70 by prism 7 reflects a part again, and this optical axis is flexed into 90 degree, and arriving signal detects with photo detector 14.
Like this, the optical recording media of CD, CD-R that 4,5 pairs of records of 2 kinds of laser diodes form of also having used DVD and CD, CD-R to use in this routine light magnetic head apparatus 1 is different and DVD etc. carries out record regenerating, but also can constitute common optical pathways 10 and use shared supervision with photo detector 2.Thus, because of not needing the discrete optical system mechanism corresponding, can reduce significantly so constitute the quantity of the optical element of optical system with each laser diode 4,5.
And the 1st laser L1 is reflected to monitoring with photo detector 2 with different transmitances respectively by wave filter 9 with the 2nd laser L2, and the result is monitoring that the 1st laser L1 equates with the intensity of the 2nd laser L2 with in the photo detector 2.Like this, by monitoring the supervision result who makes with photo detector 2, that no matter monitor is the 1st laser L1 or the 2nd laser L2, all can export equal signal under the state of not revisal.Thus, monitoring circuit is simplified the structure, and can improve according to the control response that monitors the result.
[other embodiment]
In addition, also can not adopt Fig. 1 or light magnetic head apparatus 1 shown in Figure 2, but adopt following structure, promptly, monitor laser L1, the L2 that uses photo detector 2 for directive, configuration strength balance adjusting gear is the inflection grid, utilize different these characteristics of inflection efficient of this inflection grid, adjust with the laser L1 of photo detector 2, the strength balance of L2 arriving supervision because of different laser L1, the formation of L2 wavelength.
For the layout of each optics, for example also can shown in the dotted line among Fig. 2, use photo detector 2 with monitoring with respect to reverse side configuration wave filter 9 prism 6 and the 2nd laser diode 5 again.
And the catoptron 8 of Fig. 1 also can adopt the not catoptron of band strength balance adjusting device function, and configuration is because of the different wave filter of wavelength transmitance on the light path at the place ahead of this catoptron or rear.
Claims (3)
1. a light magnetic head apparatus comprises: the 1st lasing light emitter that penetrates the 1st laser; Penetrate the 2nd lasing light emitter of the 2nd long laser of described the 1st laser of wavelength ratio; The synthetic optical element of using of light path of the common optical pathways of the 1st and the 2nd laser guide optical recording media that will penetrate from the described the 1st and the 2nd lasing light emitter; And accept the part of described the 1st laser that penetrates from described the 1st lasing light emitter in the position of separating and the shared supervision photo detector of the part of described the 2nd laser that penetrates from described the 2nd lasing light emitter from described common optical pathways, it is characterized in that,
Also has the strength balance adjusting gear that the described supervision of directive is adjusted with the strength balance of described the 1st laser of photo detector and described the 2nd laser.
2. light magnetic head apparatus as claimed in claim 1, it is characterized in that, described strength balance adjusting gear is the branch light reflecting member, this minute light reflecting member described the 1st laser and the 2nd laser that leave from described common optical pathways with the photo detector reflection to described supervision with the reflectivity of different wave length.
3. light magnetic head apparatus as claimed in claim 1, it is characterized in that, described strength balance adjusting gear is a branch light transmission member, this minute the light transmission member see through described the 1st laser and the 2nd laser that leaves from described common optical pathways with the transmitance of different wave length with photo detector to described supervision.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002161692A JP2004013936A (en) | 2002-06-03 | 2002-06-03 | Optical head device |
| JP2002161692 | 2002-06-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1467717A CN1467717A (en) | 2004-01-14 |
| CN1232966C true CN1232966C (en) | 2005-12-21 |
Family
ID=29996384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03140672 Expired - Fee Related CN1232966C (en) | 2002-06-03 | 2003-06-02 | Optical magnetic head |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2004013936A (en) |
| CN (1) | CN1232966C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005339651A (en) * | 2004-05-26 | 2005-12-08 | Sankyo Seiki Mfg Co Ltd | Optical head device |
| JP4708916B2 (en) * | 2005-08-18 | 2011-06-22 | Ｄｘアンテナ株式会社 | Monitor circuit |
| WO2008069116A1 (en) * | 2006-12-05 | 2008-06-12 | Nec Corporation | Optical head device and optical information recording/reproducing device |
-
2002
- 2002-06-03 JP JP2002161692A patent/JP2004013936A/en active Pending
-
2003
- 2003-06-02 CN CN 03140672 patent/CN1232966C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1467717A (en) | 2004-01-14 |
| JP2004013936A (en) | 2004-01-15 |
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| C14 | Grant of patent or utility model | ||
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| C56 | Change in the name or address of the patentee |
Owner name: NIDEC SANKYO CORP. Free format text: FORMER NAME OR ADDRESS: SANKYO SEIKI MFG. SEISAKUSHO K.K. |
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| CP01 | Change in the name or title of a patent holder |
Address after: Japan, Suwa, Nagano Patentee after: Sankyo Seiki Seisakusho KK Address before: Japan, Suwa, Nagano Patentee before: Sankyo Seiki Manufacturing Co., Ltd. |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20051221 |