CN1249696C - Optical device - Google Patents
Optical device Download PDFInfo
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- CN1249696C CN1249696C CN 03152554 CN03152554A CN1249696C CN 1249696 C CN1249696 C CN 1249696C CN 03152554 CN03152554 CN 03152554 CN 03152554 A CN03152554 A CN 03152554A CN 1249696 C CN1249696 C CN 1249696C
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- polarized light
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- reflection
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Abstract
The present invention provides an optical device used in optical data reading equipment, which comprises a first laser source, a spectroscope, a first objective, a light detector, a second laser source, a gangboard type spectroscope, a collimating mirror and a second objective. The first light output path and the second light output path of the present invention are independent, but the first light output path and the second light output path share the same spectroscope and the same light detector.
Description
Technical field
The present invention relates to a kind of optical signalling reading device, particularly relate to the data that to be stored in the discs and read, utilize double laser light source to import light signal in the optical detector optical devices through the optical mirror slip group of design and the optical path reached with optical read head.
Background technology
At present because multimedia content extensively increases, so need a large amount of Storage Medias, and cheap discs (Disc) is just meeting demand, no matter be that rewritable or single smear that the discs of writing is enterprise customer, domestic consumer or individual institute generally accepts, so also occur getting the specification of multiple optical disk sheet on the market, such as CD, CDR, CDRW, DVD ROM, DVD-R/W and DVD+R/W or the like, yet in different discs specifications, also exist different optics requirements.For example CD (780nm) just is not quite similar with the optical wavelength of DVD (650nm), so can take into account in the CD-ROM drive that reads CD and DVD discs at one, usually exist two groups of laser diodes (Laser Diode), two set of contact lenses groups and two groups of optical detectors (Photodetector), though so design is simple, but increase cost and unnecessary packing problem, though part CD-ROM drive factory designs various laser diodes, the optical path combination of lens set and optical detector, but all exist certain problem, therefore, the present invention proposes a kind of preferable integration mode, can reach the cost of optical read head, precisely wait requirement with assembling production.
At first, see also Fig. 1, it is the design of existing separate type, it is at different discs specifications, the optical devices of separation are provided, first optical pick-up device of Fig. 1 comprises first object lens 12 (Objective Lens), 780nm laser diode 13, first spectroscope 14 and first optical receiver 15, and second optical pick-up device also comprises second object lens 17, collimating mirror 18 (Collimator), 650nm laser diode 16, second spectroscope 19 and second optical detector 20.First optical pick-up device is similar to the optical path of second optical pick-up device, the linearly polarized light that laser diode is launched is via spectroscopical reflection earlier, through behind the object lens signal of discs 11 is taken out of, oppositely behind object lens and spectroscope, by optical detector perceived light signal.
As shown in Figure 1, though this isolating construction simplicity of design, the part assembly repeats, and optical detector and its rear end electronic circuit repeated application, can be improved, therefore a kind of design being arranged also is to utilize the conversion of mechanism to reach different optical specification requirements the optical mirror slip group again.
As the signal of Fig. 2 as can be known, different wavelength of laser diode 24,25 (780nm and 650nm) with the linearly polarized light that sent behind the optical effect of different spectroscope 26,27, be incident upon on the discs 21 through suitable objective lens 22,23, the light signal that has discs 21 data enters single optical detector 28 behind suitable objective lens 22,23 and spectroscope 26 and 27.Benefit from the switching that special mechanism's combination (not shown) is made object lens as for the adjustment of suitable objective lens 22,23, but the variation of the accurate and environment for use of the abrasion of mechanism and design, the stability of this design is also bad, and extra object lens adjustment machine is put also and can be produced extra cost, built-up time and difficulty.
So shortcoming for Fig. 2, also there is a kind of method to improve, exactly different object lens are positioned in the same optical path, and no longer need the adjustment mechanism of object lens, as shown in Figure 3, this optical devices have comprised first laser diode 33, second laser diode 34, first spectroscope 35, second spectroscope 36, collimating mirror 32, objective lens 31 and single optical detector 37.When reading different discs, promptly send polarized light by corresponding laser diode, focus on discs 30 through behind spectroscope, collimating mirror and the object lens, be fed back to single optical detector 37 again, the special place of this optical devices is that objective lens 31 can reach identical requirement at different optical wavelength, but this special objective lens 31 prices very costliness and qualification rate are also extremely low, therefore and do not meet demand on the cost of consumer appliance because this objective lens 31 is taked design of special minute surface and coating film treatment according to optical characteristics on its minute surface.
Summary of the invention
In view of in the above-mentioned background of invention at present known to the deficiency of technology, fundamental purpose of the present invention be to utilize the geometrical optics path that optical module reaches and provide that a kind of optical signalling reads that precision is good, assembly is easy to obtain and the optical devices of lower cost.
Another object of the present invention is to use the laser diode of the corresponding single wavelength of object lens and two wavelength to share single optical detector.
Another purpose of the present invention is that the different wavelength of laser diode goes out the light path difference with the reduction intensity noise, but same spectroscope and optical detector are shared in the recovering light path rear end of different wave length.
According to above-described purpose, the invention provides a kind of optical devices, comprise a kind of optical devices, comprise first light source, provide signal to read the first required polarized light; First spectroscope reflects this first polarized light; First object lens will focus on the discs from this first polarized light of this first spectroscope reflection, go out light path to finish one first; Optical detector, this first polarized light penetrates these first object lens after this discs reflection, first spectroscope enters in this optical detector, with the entrained signal of this first polarized light of perception, becomes one first recovering light path; Secondary light source provides signal to read the second required polarized light; Second spectroscope can allow this second polarized light that this secondary light source produced that is arranged at this second spectroscope rear end penetrate; And one second object lens, to focus on this discs from this second polarized light that this second spectroscope penetrates, go out light path to finish one second, wherein, this second polarized light penetrates this second object lens after this discs reflection, after this second spectroscope reflection, after this first spectroscope reflection, enter in this optical detector again,, become one second recovering light path with the entrained signal of this second polarized light of perception.
In the above-mentioned optical devices of the present invention, this first light source and two light sources all are laser diode, can produce linearly polarized light.And this second spectroscope is the gangboard spectroscope, effectively aberration for compensation.
In the above-mentioned optical devices of the present invention, a preferred embodiment provides signal to read the first required polarized light for comprising first laser diode; Spectroscope is with one first this first polarized light of reflection; First object lens will focus on the discs from this first polarized light of this first spectroscope reflection, go out light path to finish one first; Optical detector, this first polarized light penetrate these first object lens after for the reflection of this discs, first spectroscope enters in this optical detector, with the entrained signal of this first polarized light of perception, becomes one first recovering light path; Second laser diode provides signal to read the second required polarized light; The gangboard spectroscope can allow this second polarized light that this secondary light source produced of being arranged at this second spectroscope rear end penetrate and reduces aberration; Collimating mirror, this second polarized light alignment that will penetrate from this second spectroscope is to reduce aberration; And second object lens, to focus on this discs from this second polarized light that this collimating mirror penetrates, go out light path to finish one second, wherein, this second polarized light penetrates these second object lens and this collimating mirror after for the reflection of this discs, after this gangboard spectroscope reflection, after this first spectroscopical one second reflection, enter in this optical detector again,, become one second recovering light path with the entrained signal of this second polarized light of perception.And, this first spectroscopical this first with this second segmentation be located at both sides.
Description of drawings
Fig. 1 is existing optical devices synoptic diagram with optical pick-up device of separation;
Fig. 2 is existing second kind of optical devices synoptic diagram;
Fig. 3 is the improvement synoptic diagram at these second kind of existing optical devices; And
Fig. 4 is a preferred embodiment of the present invention.
Embodiment
Embodiments of the invention can be described in detail as follows.Yet except describing in detail, the present invention can also be widely implements at other embodiment, and scope of the present invention do not limited, its with after claim be as the criterion.
Moreover for clearer description being provided and being more readily understood the present invention, graphic interior each several part is not drawn according to its relative size, and some size is compared with other scale dependent and exaggerated; Incoherent detail section is not drawn fully yet, in the hope of graphic succinct.
Synoptic diagram of the present invention as shown in Figure 4, first laser diode 44 sends polarized light to the first spectroscope 46, after 41 projections of first object lens focus on the discs 40, this is first to go out light path through the reflection of first spectroscope 46; After after the optical processing of discs 40, and become a flashlight after having data-signal on the discs, behind these first object lens 41 and first spectroscope 46, enter optical detector 48 to read signal, this is first recovering light path; At last by the electronic circuit of rear end and the data in this discs 40 of soft firmware processing reduction.
Generally speaking, the polarized light that this first laser diode 44 is sent is the linearly polarized light of wavelength 780nm, is used for CD discs specification.But when suitable first object lens, 41 designs, also can change the first laser light diode 44 into send 650nm linearly polarized light, simultaneously, at first object lens 41 and 46 in first spectroscope collimating mirror (not shown) can be set and improve contingent aberration.
In addition, second laser diode 45 is arranged on second spectroscope, 47 rear ends, after the polarized light that is sent penetrates second spectroscope 47 and collimating mirror 43, is incident upon discs 40 through the focusing of second object lens 42, this is second to go out light path; Data in taking discs 40 out of and become flashlight behind former second object lens 42 and collimating mirror 43, are that second spectroscope 47 reflexes on first spectroscope 46, enter optical detector 48 then to detect signal, and this is second recovering light path.
Same, the polarized light that this second laser diode 45 is sent is generally the linearly polarized light of wavelength 650nm, is used for DVD discs specification.But when suitable second object lens, 42 designs, also can change the second laser light diode 45 into send 780nm linearly polarized light, simultaneously, when aberration is in acceptable scope, can it be set at the collimating mirror 43 of 47 in second object lens 42 and second spectroscope.Be based on second laser 45 in second reason that goes out the set collimating mirror 43 in light path and second loop and be arranged on second spectroscope, 47 rear ends, when the polarized light that is sent penetrates second spectroscope 47, be easy to generate aberration, so second spectroscope 47 that is adopted can be corner cut formula spectroscope (Wedged Plate BeamSplitter, or be called the gangboard light-dividing device), because of its effective aberration for compensation.Similarly, this first spectroscope 46 also can adopt corner cut formula spectroscope (Wedge Plate Beam Splitter, or be called the gangboard light-dividing device), with aberration for compensation
Hence one can see that, first recovering light path is just identical behind first spectroscope, 46 rear ends with the back segment optical path of second recovering light path, therefore corresponding different wave length of the present invention has difference to go out light path can effectively to reduce interference, and adopts the spectroscope (as first spectroscope) in same light echo path and optical detector to reduce cost.
So design can be reached down independently going out light path but Fig. 2 being arranged and the spectroscope and the optical detector of shared light echo shown in Figure 3 of existing Fig. 1, and in addition, the present invention uses abundant obtainable assembly, reduces cost significantly.And be not easy produce to disturb (for example intensity noise, Intensity Noise) because independently go out light path, so can have high-precision optical signalling to read the result again.
The above is preferred embodiment of the present invention only, is not in order to limit claim of the present invention; All other do not break away from the equivalence of being finished under the disclosed spirit and changes or modification, all should comprise in the claims.
Claims (10)
1. optical devices comprise:
One first light source provides signal to read the first required polarized light;
One first spectroscope reflects this first polarized light;
One first object lens will focus on the discs from this first polarized light of this first spectroscope reflection, go out light path to finish one first;
One optical detector, this first polarized light penetrates these first object lens after this discs reflection, first spectroscope enters in this optical detector, with the entrained signal of this first polarized light of perception, becomes one first recovering light path;
One secondary light source provides signal to read the second required polarized light;
One second spectroscope can allow this second polarized light that this secondary light source produced that is arranged at this second spectroscope rear end penetrate; And
One second object lens will focus on this discs from this second polarized light that this second spectroscope penetrates, and go out light path to finish one second,
Wherein, this second polarized light penetrates this second object lens after the reflection of this discs, after this second spectroscope reflection, enter in this optical detector after this first spectroscope reflection again, with the entrained signal of this second polarized light of perception, becomes one second recovering light path.
2. optical devices as claimed in claim 1 also comprise a collimating mirror, are arranged between this second spectroscope and second object lens, in order to compensate the aberration of this second polarized light.
3. optical devices as claimed in claim 1 also comprise a collimating mirror, are arranged between this first spectroscope and first object lens, in order to compensate the aberration of this first polarized light.
4. optical devices as claimed in claim 1, this first polarized light is respectively in these first spectroscopical both sides in this first spectroscopical reflecting surface and this second polarized light in this first spectroscopical reflecting surface.
5. optical devices as claimed in claim 1, this first light source is a laser diode, can produce linearly polarized light.
6. optical devices as claimed in claim 1, this secondary light source are a laser diode, can produce linearly polarized light.
7. optical devices as claimed in claim 1, this first spectroscope are a gangboard spectroscope, but aberration for compensation.
8. optical devices as claimed in claim 1, this second spectroscope are a gangboard spectroscope, but aberration for compensation.
9. optical devices as claimed in claim 1, wherein said first light source is one first laser diode, described first spectroscope, with one first this first polarized light of reflection, described secondary light source is one second laser diode, described second spectroscope is a gangboard spectroscope, these optical devices also comprise a collimating mirror, this second polarized light alignment that will penetrate from this second spectroscope is to reduce aberration, wherein, this second polarized light penetrates these second object lens and this collimating mirror after for the reflection of this discs, after this gangboard spectroscope reflection, after this first spectroscopical one second reflection, enter in this optical detector again,, become one second recovering light path with the entrained signal of this second polarized light of perception.
10. optical devices as claimed in claim 9, this first spectroscopical this first with this second segmentation be located at both sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03152554 CN1249696C (en) | 2003-08-05 | 2003-08-05 | Optical device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03152554 CN1249696C (en) | 2003-08-05 | 2003-08-05 | Optical device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1581316A CN1581316A (en) | 2005-02-16 |
| CN1249696C true CN1249696C (en) | 2006-04-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03152554 Expired - Fee Related CN1249696C (en) | 2003-08-05 | 2003-08-05 | Optical device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1249696C (en) |
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2003
- 2003-08-05 CN CN 03152554 patent/CN1249696C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1581316A (en) | 2005-02-16 |
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Owner name: YUTIAN STOCK CO., LTD. Free format text: FORMER OWNER: HONGJING SCIENCE + TECH. CO., LTD. Effective date: 20071228 |
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Effective date of registration: 20071228 Address after: Delaware Patentee after: VIA Tech Inc. Address before: Hsinchu city of Taiwan Province Patentee before: Hongjing Science-Technology Co., Ltd. |
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Granted publication date: 20060405 Termination date: 20130805 |