CN100530380C - Optical system used for writing optical head - Google Patents
Optical system used for writing optical head Download PDFInfo
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- CN100530380C CN100530380C CNB2007100753947A CN200710075394A CN100530380C CN 100530380 C CN100530380 C CN 100530380C CN B2007100753947 A CNB2007100753947 A CN B2007100753947A CN 200710075394 A CN200710075394 A CN 200710075394A CN 100530380 C CN100530380 C CN 100530380C
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Abstract
The invention discloses an optical system for inscribing an optical head, which belongs to the technical field of optical storage. The invention comprises a first laser generator, a second laser generator, a grating, a polarization light division unit, an optical signal collection module and a photoelectric signal pickup module. A light beam generated from the first laser generator and the second laser generator reaches to the polarization light division unit to form a P polarized light via the grating; the P polarized light reaches a compact disc via the optical signal collection module; a compact disc reflection light reaches to the polarization light division unit via the optical signal collection module; the polarized light from the polarization light division unit reaches to the optical signal pickup module. The invention is characterized in that: the grating is arranged as an array grating. Besides, because a plurality of array gratings are positioned in front of the two laser generators, the invention is able to track the signal channel, inhibit the side lobe of focusing facula and enhance the central strength, thus improving the reading quality information symbol in compact disc and reducing the noise.
Description
Technical field
The invention belongs to field of optical storage technology, more specifically say to relate to a kind of optical system that is used for writing optical head.
Background technology
Based on numerical aperture is that optical read head is as its core in the red light high-density of the 0.6/0.65 light storage device that can be used for inscribing, and optical system wherein is to realize the basis and the carrier of lightray propagation and conversion.
Because the requirement of inscribing precision needed precision when reading,, and increase the monitoring of object lens inclining state is guaranteed to inscribe precision with controlling so it is higher to be used for controlling focusing and the tracking accuracy requirement of optical head object lens.In addition, because the laser power that requires when inscribing is required laser power when reading also, so be used for the laser instrument that writing optical head generally adopts special-purpose high-power, low aspect ratio, peak power when inscribing has simultaneously also determined the highest etch-recording speed, the light storage device that is used for imprinting at present realizes that the highest etch-recording speed of industrialization reaches 16X, obtain the inscription speed of 16X, must guarantee to arrive the luminous power of disc more than 200mW.The peak power that has realized at present being used for the imprinting optical head reaches the single wavelength laser of 500mW, makes that more the inscription speed of high power speed becomes possibility.
The optical system of writing optical head generally comprises lasing light emitter 1, lasing light emitter 2, polarization spectro unit, photosignal pickup model, optical signalling acquisition module, disc at present, the light beam that sends from lasing light emitter 1, lasing light emitter 2 becomes the P polarized light through the polarization spectro unit combination, the P polarized light arrives disc by the optical signalling acquisition module, the disc reflected light arrives the polarization spectro unit through the optical signalling acquisition module again, the polarization spectro unit makes the S polarized light arrive the photosignal pickup model, with the signal that obtains to be write down on the disc.Generally be provided with single array grating in the front of two lasing light emitters, the light that lasing light emitter sends arrives the polarization spectro unit by grating.Single array grating only has the channel tracking effect at this, and not to the inhibiting effect of focal beam spot secondary lobe, so center intensity differs and reserve, and influences reading of optical disc information symbol, and noise is big.
Summary of the invention
Thereby technical matters to be solved by this invention provides a kind of optical system that is used for writing optical head that can suppress focal beam spot secondary lobe raising center intensity.
System of the present invention comprises: first laser instrument, second laser instrument, grating, the polarization spectro unit, the optical signalling acquisition module, the photosignal pickup model, from first laser instrument, the light beam that second laser instrument sends arrives the polarization spectro unit combination by grating respectively and becomes the P polarized light, the P polarized light arrives disc by the optical signalling acquisition module, the disc reflected light arrives the polarization spectro unit through the optical signalling acquisition module again, the S polarized light that comes out from the polarization spectro unit arrives on the photosignal pickup model, and it is characterized in that: described grating is many array gratings.
Angle between described many array gratings and distance adapt with the diffracting effect of needs.Can make it reach required diffracting effect by adjusting angle and the side-play amount between many array gratings like this.
Side-play amount between described many array gratings is 1/4 of a grating grid.This is the side-play amount between preferred a kind of many array gratings.
Side-play amount between described many array gratings is 1/3 of a grating grid.This also is the side-play amount between preferred a kind of many array gratings.
The operating distance that described second laser instrument arrives the optical signalling acquisition module is far away than first laser instrument, is provided with offset lens before second laser instrument.Like this can the compensate for optical signal acquisition module to the operating distance of this optical maser wavelength, make it have normal focal position, aberration for compensation.If there is not offset lens, the operating distance of two laser instrument arrival optical signalling acquisition modules is different, and therefore, the wavelength of second laser instrument can be offset, have no idea to reach the focal beam spot of diffraction limit, thereby can not guarantee that the information that correctly reads disc accords with in optical disc surface formation.
Described optical system also comprises catoptron, and the P polarized light that comes out from the polarization spectro unit changes optical path direction and arrives the optical signalling acquisition module after mirror reflects, and the light that comes out from the optical signalling acquisition module arrives the polarization spectro unit after mirror reflects.Can change optical path direction like this, adjust light channel structure, thereby the miniaturization of entire system is provided.
Described optical system also comprises optical power detector, and the catoptron transmission can be for the beam energy of optical power detector detection power to optical power detector, and optical power detector is connected with the power controller of laser instrument.Set up optical power detector, can as required the power of laser instrument be adjusted in real time.
The beam energy that described catoptron is transmitted to optical power detector is 5% of the preceding beam energy of transmission.This is the beam energy of preferred a kind of transmission.
Described optical signalling acquisition module comprises collimating mirror, quarter wave plate, object lens, and the light beam after the mirror reflects becomes the equally distributed parallel beam of intensity through collimating mirror; Parallel beam becomes circularly polarized light by quarter wave plate with the P polarized light; By object lens parallel beam is focused to a bit, and the reflection by signal pit bank on the disc, parallel beam become by object lens once more; Parallel beam by quarter wave plate, becomes the S polarized light with circularly polarized light once more; The S polarized light arrives catoptron through collimating mirror.This is a kind of concrete optical signalling acquisition module light path.
Described photosignal pickup model comprises astigmatism element and signal sensor, and the S polarized light that comes out from the polarization spectro unit arrives the astigmatism element, the light arriving signal detector that comes out from the astigmatism element.This photosignal pickup model can be surveyed the out-of-focus appearance of object lens by the astigmatism signal.
The present invention is owing to be provided with many array gratings before two laser instruments.So not only have the channel tracking effect, and can suppress focal beam spot secondary lobe, raising center intensity, thereby improve the reading quality of optical disc information symbol, reduce noise.
Description of drawings
Fig. 1 is the optical signal transmission schematic diagram of writing optical head;
Fig. 2 is the light path synoptic diagram of writing optical head among the embodiment.
Among Fig. 2: 1, first laser instrument, 2, second laser instrument, 3, two array grating, 4, two array gratings, 5, offset lens, 6, the polarization spectro unit, 7, catoptron, 8, optical power detector, 9, collimating mirror, 10, quarter wave plate, 11, object lens, 12, disc, 13, the astigmatism element, 14, signal sensor.
Embodiment
The optical signal transmission schematic diagram of Fig. 1 writing optical head.
The optical system of writing optical head generally comprises lasing light emitter 1, lasing light emitter 2, polarization spectro unit, photosignal pickup model, optical signalling acquisition module, disc, the light beam that sends from lasing light emitter 1, lasing light emitter 2 becomes the P polarized light through the polarization spectro unit combination, the P polarized light arrives disc by the optical signalling acquisition module, the disc reflected light arrives the polarization spectro unit through the optical signalling acquisition module again, the polarization spectro unit makes the S polarized light arrive the photosignal pickup model, with the signal that obtains to be write down on the disc.
The invention will be further described below in conjunction with accompanying drawing 2 and preferred embodiment.
Optical system first laser instrument 1 of the writing optical head in the present embodiment, second laser instrument 2, two array grating 3, two array grating 4, offset lens 5, polarization spectro unit 6, catoptron 7, optical power detector 8, collimating mirror 9, quarter wave plate 10, object lens 11, disc 12, astigmatism element 13, signal sensor 14.
The propagation of light beam comprises following each several part in the present embodiment:
(1) light beam that sends from first laser instrument 1 is through two array grating 3 beam split, obtain 0 grade, ± light beam such as 1 grade is used for writable disc information; Side-play amount between two array gratings is 1/4 of a grating grid.
(2) light beam that sends from second laser instrument 2 is through two array grating 4 beam split, obtains 0 grade, ± 1 grade wait light beam to be used for writable disc information, and pass through offset lens 5 and compensate the operating distance of collimating mirrors this wavelength laser;
(3) the desirable light path of sending laser from first, second laser instrument laser instrument 1,2 respectively overlaps through forming 6 backs, polarization spectro unit by polarization spectroscope etc., and laser is the P polarized light at this moment;
(4) use catoptron 7 reflections P polarized light at this moment, change optical path direction (adjustment light channel structure), 5% of the transmitted light beam energy to power detector 8 simultaneously, and by this detector, the power of laser instrument is adjusted in real time;
(5) light beam after the reflection becomes the equally distributed parallel beam of intensity through collimating mirror 9;
(6) by quarter wave plate 10, the P polarized light is become circularly polarized light;
(7) by object lens 11 parallel beam is focused to a bit, and the reflection by signal pit bank on the disc 12, directional light become by object lens 11 once more;
(8) once more by quarter wave plate 10, circularly polarized light is become the S polarized light;
(9) the S polarized light is through by the polarization spectro unit S polarized light being arrived on the astigmatism element 13 once more behind the collimating mirror 9, with the signal that obtains to be write down on the disc;
(10) on the light arriving signal detector of astigmatism element 13, produce the out-of-focus appearance that the astigmatism signal is surveyed object lens.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention; without departing from the inventive concept of the premise; can also make some simple deduction or replace; as: many array gratings also can be the tri-array gratings; side-play amount between the array grating also can be 1/4 of a grating grid; the beam energy of catoptron transmission also can not be 5% etc., all should be considered as belonging to protection scope of the present invention.
Claims (10)
1, a kind of optical system that is used for writing optical head, comprise: first laser instrument, second laser instrument, grating, the polarization spectro unit, the optical signalling acquisition module, the photosignal pickup model, from first laser instrument, the light beam that second laser instrument sends arrives the polarization spectro unit combination by grating respectively and becomes the P polarized light, the P polarized light arrives disc by the optical signalling acquisition module, the disc reflected light arrives the polarization spectro unit through the optical signalling acquisition module again, the S polarized light that comes out from the polarization spectro unit arrives on the photosignal pickup model, and it is characterized in that: described grating is many array gratings.
2, the optical system that is used for writing optical head according to claim 1 is characterized in that: the angle between described many array gratings and the diffracting effect of side-play amount and needs adapt.
3, the optical system that is used for writing optical head according to claim 2 is characterized in that: the side-play amount between described many array gratings is 1/4 of a grating grid.
4, the optical system that is used for writing optical head according to claim 2 is characterized in that: the side-play amount between described many array gratings is 1/3 of a grating grid.
5, the optical system that is used for writing optical head according to claim 1 is characterized in that: the operating distance that described second laser instrument arrives the optical signalling acquisition module is far away than first laser instrument, is provided with offset lens before second laser instrument.
6, the optical system that is used for writing optical head according to claim 1, it is characterized in that: described optical system also comprises catoptron, the P polarized light that comes out from the polarization spectro unit changes optical path direction and arrives the optical signalling acquisition module after mirror reflects, the light that comes out from the optical signalling acquisition module arrives the polarization spectro unit after mirror reflects.
7, the optical system that is used for writing optical head according to claim 6, it is characterized in that: described optical system also comprises optical power detector, the catoptron transmission can be for the beam energy of optical power detector detection power to optical power detector, and optical power detector is connected with the power controller of laser instrument.
8, the optical system that is used for writing optical head according to claim 7 is characterized in that: the beam energy that described catoptron is transmitted to optical power detector is 5% of the preceding beam energy of transmission.
9, the optical system that is used for writing optical head according to claim 6, it is characterized in that: described optical signalling acquisition module comprises collimating mirror, quarter wave plate, object lens, light beam after the mirror reflects becomes the equally distributed parallel beam of intensity through collimating mirror; Parallel beam becomes circularly polarized light by quarter wave plate with the P polarized light; By object lens parallel beam is focused to a bit, and the reflection by signal pit bank on the disc, parallel beam become by object lens once more; Parallel beam by quarter wave plate, becomes the S polarized light with circularly polarized light once more; The S polarized light arrives catoptron through collimating mirror.
10, the optical system that is used for writing optical head according to claim 1, it is characterized in that: described photosignal pickup model comprises astigmatism element and signal sensor, the S polarized light that comes out from the polarization spectro unit arrives the astigmatism element, the light arriving signal detector that comes out from the astigmatism element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100753947A CN100530380C (en) | 2007-08-02 | 2007-08-02 | Optical system used for writing optical head |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100753947A CN100530380C (en) | 2007-08-02 | 2007-08-02 | Optical system used for writing optical head |
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| Publication Number | Publication Date |
|---|---|
| CN101110233A CN101110233A (en) | 2008-01-23 |
| CN100530380C true CN100530380C (en) | 2009-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2007100753947A Expired - Fee Related CN100530380C (en) | 2007-08-02 | 2007-08-02 | Optical system used for writing optical head |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105355217B (en) * | 2015-09-29 | 2017-11-14 | 中国科学院上海光学精密机械研究所 | The parallel Written Device of dual-beam based on condenser lens axial chromatic aberration |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6369377B1 (en) * | 2000-05-08 | 2002-04-09 | Industrial Technology Research Institute | Multiple-beam holographic optical pick-up head |
| CN1506952A (en) * | 2002-12-10 | 2004-06-23 | ���ǵ�����ʽ���� | Optical pickup equipment |
| CN1867978A (en) * | 2003-10-15 | 2006-11-22 | 皇家飞利浦电子股份有限公司 | An optical data reading/writing device having separated read and write beams |
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2007
- 2007-08-02 CN CNB2007100753947A patent/CN100530380C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6369377B1 (en) * | 2000-05-08 | 2002-04-09 | Industrial Technology Research Institute | Multiple-beam holographic optical pick-up head |
| CN1506952A (en) * | 2002-12-10 | 2004-06-23 | ���ǵ�����ʽ���� | Optical pickup equipment |
| CN1867978A (en) * | 2003-10-15 | 2006-11-22 | 皇家飞利浦电子股份有限公司 | An optical data reading/writing device having separated read and write beams |
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| Publication number | Publication date |
|---|---|
| CN101110233A (en) | 2008-01-23 |
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