CN1581317A - Optical reading-writing head device - Google Patents
Optical reading-writing head device Download PDFInfo
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- CN1581317A CN1581317A CN 03152574 CN03152574A CN1581317A CN 1581317 A CN1581317 A CN 1581317A CN 03152574 CN03152574 CN 03152574 CN 03152574 A CN03152574 A CN 03152574A CN 1581317 A CN1581317 A CN 1581317A
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- polarized light
- light
- optical pick
- optical
- spectroscope
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Abstract
The optical reading/writing head includes following parts: laser diode for emitting linearly polarized light in certain phase angle; beam-splitter mirror for making original polarized light become reflected circularly polarized light in clockwise rotation, and letting circularly polarized light accompanied with signal in anti clockwise rotation pass through; collimator mirror adjusts circularly polarized light in clockwise rotation into collimated light; lens and optical detector for detecting signal on optical disk. In the invention, the beam-splitter mirror generates linearly polarized light in minus 45 degrees phase angle, which feeds back to laser diode. Difference of phase angle between the said feedback linearly polarized light and linearly polarized light emitted by laser diode is 90 degrees.
Description
Technical field
The present invention relates to a kind of optical read-write head device, particularly relate to a kind of linearly polarized light that laser diode is sent and the linear polarization that is fed to laser diode through the discs reflected back, have the optical read-write head devices of phase differential to avoid interference of 90 degree.
Background technology
With reference to shown in Figure 1, existing be applied in the CD-ROM drive is made up of icon component to read in the discs optical read/write head of RW data, at first, laser diode 11 (Laser Diode) emission P molded lines polarization laser light is to polarization spectroscope 12 (PBS, Polarized Beam Splitter), behind polarization spectroscope 12 and quarter-wave plate 13 (Quarter Wave Plate), forming the dextrorotation circularly polarized light advances toward discs 16, after the optics adjustment via collimating mirror 14 (Collimator Lens) and object lens 15 (ObjectiveLens), via discs 16 reflections, its optical path is to follow original route to return, promptly oppositely via behind object lens 15 and the collimating mirror 14, enter in quarter-wave plate 13 and the polarization spectroscope 12 in opposite hand circular polarization light mode, form S molded lines polarized light at last and advance to optical detector 17 (Photodetector).
But detect in the optical path of discs information at this section optical signalling, because the optical characteristics factor of polarization spectroscope 12, the flashlight of a little can be fed back to penetrates diode 11, because the lighting cavity that part signal light can enter laser diode 12 in the mode of P molded lines polarized light during via polariscope 12, form intensity noise (Intensity Noise), and then influence the emitted original P molded lines polarized light of this laser diode 11, as shown in Figure 2, its result will cause optical detector 17 to detect reading the relative intensity noise that is produced, and the signal read accuracy of optical read head is produced harmful effect.
Defective based on aforementioned existing optical pick-up device, the present invention is by the optical physics characteristic of optical read-write head device, design a kind of optical pick-up device and its optical path, make the present invention can effectively reduce the intensity noise that signal reads, increase the signal read accuracy of optical read head, improve the shortcoming of existing optical read head.
Summary of the invention
Based on above goal of the invention and solve existing shortcoming, in order effectively to reduce the intensity noise that signal reads, increase under the preceding topic of signal read accuracy of optical read head, special the present invention proposed.
The invention provides a kind of optical pick-up device, comprise a laser diode, have an original line polarized light at one or four ten five degree phasing degree in order to emission; One spectroscope becomes a dextrorotation circularly polarized light in order to reflect this original line polarized light, and makes an opposite hand circular polarization light that has signal penetrate it; One collimating mirror is a directional light with this dextrorotation circularly polarized light alignment; One lens focus on this dextrorotation circularly polarized light to a discs, make that the former polarized light of this derotation after this discs reflection has a signal; And an optical detector, detect this signal.
In addition, in the optical pick-up device of the present invention, this spectroscope can produce has negative 45 feedback line polarized lights of spending phasing degree to this laser diode, makes this feedback polarized light and this linearly polarized light have phase angle difference 90 degree.
Description of drawings
Fig. 1 is existing optical read-write head device synoptic diagram;
Fig. 2 is the feedback intensity noise synoptic diagram that existing optical read-write head device produces;
Fig. 3 is the synoptic diagram of optical read/write head embodiment of the present invention.
Embodiment
The present invention mainly provides a kind of signal read accuracy good optical pick-up device, as shown in Figure 3, the present invention includes laser diode 21, spectroscope 22 (or unpolarized light microscopic), collimating mirror 23, object lens 24, discs 25 and optical detector 26.
At first, laser diode 21 is to the linearly polarized light of spectroscope 22 emission tools 45 degree phase places, beam split reflex via spectroscope 22, the linearly polarized light of this emission is advanced to collimating mirror 23 with the dextrorotation circularly polarized light, collimating effect via 23 pairs of these circularly polarized lights of collimating mirror is similar to directional light to reduce the generation of aberration to form, focus on discs 25 with object lens 24, and via after discs 25 reflections, its optical path follows original route and returns, promptly oppositely via behind object lens 24 and the collimating mirror 23, enter spectroscope 22 in opposite hand circular polarization light mode, form linearly polarized light at last and advance to optical detector 26 (Photodetector).
But detect in the optical path of discs information at this section optical signalling, because the optical characteristics factor of spectroscope 22, the flashlight of a little also can be fed back in the lighting cavity of laser diode 21, but this a little feedback signal light is because have negative 45 degree phase places, and with the phase angle differences of original line polarized light of former 45 degree phase places be 90 degree, so the influence of intensity noise can be removed.
Yet, because the qualification rate of spectroscope and other optical module (as collimating mirror, lens, laser diode etc.) and the influence of optical characteristics (as reflectivity, penetrance etc.), make that aforesaid phase angle difference may non-just 90 degree, but because phase angle difference still exists, so still can effectively reduce the influence of intensity noise.According to practical operation, with obtainable optical module actual measurement on the existing market down, phase angle difference of the present invention is the nargin that 90 degree add positive and negative 30 degree phase places.
In addition, spectroscope of the present invention also can be unpolarized spectroscope and replaces, or combine by the spectroscope of multi-disc, because this cause, the present invention can reduce former times and know the use of the particular optical assembly (as the quarter-wave plate) of optical read/write head, and then can read outside the precision with improving optical signalling in the reduction of noise, also can reduce cost.
Comprehensive above explanation, the present invention is a kind of intensity noise that signal reads that not only effectively reduces, increase the signal read accuracy of optical read head, also be that person skilled in the art scholar is difficult for thinking to reach, and also reached the degree that specifically to implement, never see domestic and international publication or public use earlier, the present invention meets the condition of patentability.
Claims (10)
1. optical pick-up device comprises:
One light source has the linearly polarized light at a phasing degree in order to emission;
One spectroscope in order to reflecting this linearly polarized light, and makes a polarized light that has signal penetrate it;
One lens focus on polarized light to a discs of coming from this spectroscope reflection; And
One optical detector, this polarized light that has signal detects signal message certainly.
2. optical pick-up device as claimed in claim 1 also includes a collimating mirror, enters in this spy's mirror after this polarized light being calibrated to approximate directional light.
3. optical pick-up device as claimed in claim 1, this light source are a laser diode.
4. optical pick-up device as claimed in claim 1, this polarized light of this spectroscope reflection is a circularly polarized light.
5. optical pick-up device as claimed in claim 4, wherein this circularly polarized light is a dextrorotation circularly polarized light.
6. optical pick-up device as claimed in claim 1, this polarized light that has signal is an opposite hand circular polarization light.
7. optical pick-up device as claimed in claim 1, this phasing degree are 45 degree phasing degree.
8. optical pick-up device as claimed in claim 1, this spectroscope produce has negative 45 feedback polarized lights of spending phasing degree to this light source, makes this feedback polarized light and this linearly polarized light have phase angle difference 90 degree.
9. optical pick-up device comprises:
One laser diode has one or four ten five original line polarized lights of spending phasing degree in order to emission;
One spectroscope becomes a dextrorotation circularly polarized light in order to reflect this original line polarized light, and makes an opposite hand circular polarization light penetrate it;
One collimating mirror is with this dextrorotation circularly polarized light alignment, to reduce aberration;
One lens focus on this dextrorotation circularly polarized light to a discs, make that the former polarized light of this derotation after this discs reflection has a signal; And
One optical detector detects this signal.
10. optical pick-up device as claimed in claim 9, this spectroscope produce has negative 45 feedback line polarized lights of spending phasing degree to this laser diode, makes this feedback polarized light and this linearly polarized light have phase angle difference 90 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031525741A CN1317701C (en) | 2003-08-04 | 2003-08-04 | Optical reading-writing head device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031525741A CN1317701C (en) | 2003-08-04 | 2003-08-04 | Optical reading-writing head device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1581317A true CN1581317A (en) | 2005-02-16 |
| CN1317701C CN1317701C (en) | 2007-05-23 |
Family
ID=34579849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031525741A Expired - Fee Related CN1317701C (en) | 2003-08-04 | 2003-08-04 | Optical reading-writing head device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1317701C (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR960705314A (en) * | 1994-07-29 | 1996-10-09 | 이데이 노부유키 | Optical pick-up apparatus |
| JP2003132568A (en) * | 2001-10-25 | 2003-05-09 | Sanyo Electric Co Ltd | Optical disk device and tilt detection method |
| JP3904893B2 (en) * | 2001-11-06 | 2007-04-11 | シャープ株式会社 | Optical pickup device |
-
2003
- 2003-08-04 CN CNB031525741A patent/CN1317701C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1317701C (en) | 2007-05-23 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: YUTIAN STOCK CO., LTD. Free format text: FORMER OWNER: HONGJING SCIENCE + TECH. CO., LTD. Effective date: 20071228 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
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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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070523 Termination date: 20130804 |