CN101807425A - Blue light optical head - Google Patents
Blue light optical head Download PDFInfo
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- CN101807425A CN101807425A CN 201010137997 CN201010137997A CN101807425A CN 101807425 A CN101807425 A CN 101807425A CN 201010137997 CN201010137997 CN 201010137997 CN 201010137997 A CN201010137997 A CN 201010137997A CN 101807425 A CN101807425 A CN 101807425A
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Abstract
The invention discloses a blue light optical head, which comprises a first light source system with the first wave length, a first focusing light path system, a second light source system with the second wave length, a second focusing light path system, a detection light path system, a polarization light path system and a light splitting element, wherein the first focusing light path system comprises a lambda/4 wave plate corresponding to the first wave length, the second focusing light path system comprises a lambda/4 wave plate corresponding to the second wave length, the two sets of light path systems can share a common optical axis in most regions through the arrangement of the polarization light path system, and the optical phase delay effect of the lambda/4 wave plates are utilized for reaching the goal that reflecting light can directly transmit the light splitting element during the original path returning and can be emitted into the detection light path system through passing the polarization light path system in a reverse direction. Thereby, the overlapping and integrated design of a reverse light path and an input light path can be realized, the integration degree of the optical head is higher, and the size of the optical head can be very small.
Description
Technical field
The present invention relates to blue light optical head, especially relate to the CD light path technology of the blu-ray drives optical head that is the information carrier that reads/write down.
Background technology
Blue light (Blu-ray) or the blue laser that claims Blu-ray disc (Blu-ray Disc is abbreviated as BD) to utilize wavelength to lack (405nm) read and write data, and therefore gain the name.Read or write data and traditional DVD needs shaven head to send red laser (wavelength is 650nm), as a rule the short more laser of wavelength can write down or read more information on unit area.Therefore, the blue light the earth has improved the memory capacity of CD, and for the optical storage product, blue light provides the chance of a leapfrogging growth.
But because blue light optical head is wanted compatible traditional common DVD optical head, and the input path of existing blue light optical head and reflected light path be separated from each other by optical element, and this just causes low, the bulky problem of integrated level.
Summary of the invention
The objective of the invention is to solve many, the bulky problems of existing optical element in the prior art, propose a kind of novel blue light optical head.
In order to solve the problems of the technologies described above, the blue light optical head that the present invention proposes, comprise first light-source system, the first focused light passages system with first wavelength, secondary light source system, the second focused light passages system and survey light path system with second wavelength, it is characterized in that: also comprise biasing light path system, beam splitter, and include λ/4 wave plates in the described first focused light passages system, include λ/4 wave plates in the described second focused light passages system corresponding to second wavelength corresponding to first wavelength; Described first light-source system can incide the biasing light path system by the different inlets of biasing light path system respectively with the light that the secondary light source system is sent, after the outgoing of biasing light path system, then can inject beam splitter, after beam split, can incide the first focused light passages system or the second focused light passages system separately along same light path; The reflected light of disc can reversely respectively turn back to the first focused light passages system or the second focused light passages system, and reverse by beam splitter, biasing light path system, enters the detection light path system.
Preferably, the present invention can also comprise following feature:
First light-source system comprises first light source and the first light source grating, the secondary light source system comprises secondary light source and secondary light source grating, light through the first light source grating or secondary light source optical grating diffraction after, promptly incide in the biasing light path system with central principal maximum diffraction light, as reading/information carrier of recording disk information; With the control signal carrier of secondary maximum diffraction light as blu-ray drives optical head servo controller.
The light wavelength that secondary light source penetrates is shorter than the light wavelength that first light source penetrates; The angle of divergence of the first light emitted light beam is littler than the angle of divergence of above-mentioned secondary light source emission light beam; The first light source grating is identical with the used grating performance parameter of secondary light source grating.
The biasing light path system comprises: the first optical polarization element is used for the light beam that first light-source system sends is turned back to the light path system axis direction; The second optical polarization element is used for the laser beam that the secondary light source system sends is turned back to the light path system axis direction; Optical lens is used for the described beam splitter of directive after the beam collimation.
Described first optical polarization element and the above-mentioned second optical polarization element are single wavelength polarization splitting prism; The light wavelength that corresponding described first light-source system of the described first optical polarization element operation wavelength is sent, the light wavelength that the corresponding described secondary light source of described second optical polarization element operation wavelength system is sent.
Beam splitter is the Amici prism according to wavelength; The light beam with first wavelength that described beam splitter sends first light-source system is injected the first focused light passages system, and the light beam with second wavelength that the secondary light source system sends is injected the second focused light passages system.
The first focused light passages system also comprises first reflecting surface and first object lens that focus on CD successively along light path; The second focused light passages system also comprises second reflecting surface, the 3rd reflecting surface successively and focuses on second object lens of CD along light path.
The invention has the beneficial effects as follows: by the biasing light path system setting make two the cover light path systems can be at the regional common optical axis of major part, and utilize the optical phase put-off effect of λ/4 wave plates, thereby make reflected light direct transmission beam splitter when Yuan Lu returns, and oppositely by the biasing light path system, and incide the detection light path system.So just realized the coincidence of reverse optical path and input path, integrated design, the integrated level of optical head is higher, and its volume just can be done very for a short time.
Description of drawings
Fig. 1 is the schematic perspective view of the light path system of the embodiment of the invention.
Fig. 2 is the schematic top plan view of embodiment of the invention light path.
Fig. 3 is the polarization splitting prism principle schematic.
Among the figure, 1 is the DVD light source, and 2 is DVD light source grating, 3 is the BD light source, and 4 is BD light source grating, and 5 is first single wavelength polarization splitting prism, 6 is second single wavelength polarization splitting prism, and 7 is collimation lens, and 8 is the Amici prism according to wavelength, 9 is first reflecting surface, and 10 is λ/4 wave plates, and 11 is first object lens, 12 is second reflecting surface, and 13 is the 3rd reflecting surface, and 14 is the 2nd λ/4 wave plates, 15 is second object lens, and 16 is cylindrical mirror, and 17 is optical detection device.
Embodiment
Below in conjunction with embodiment and contrast accompanying drawing the present invention is further described.
For further optimizing the light path of blue light optical head, the embodiment of the invention has been taked following measure.
1. light-source system
In first light-source system and the secondary light source system, the front of LASER Light Source all is added with a grating.In light path system, with central principal maximum diffraction light as reading/information carrier of recording disk information; With the control signal carrier of secondary maximum diffraction light as blu-ray drives optical head servo controller.Promptly when read/write CD tracking, survey tracking information with principal maximum diffraction lights at different levels; The tracking signal that detects according to principal maximum diffraction lights at different levels then, servo controller is made adjustment, with principal maximum diffraction light alignment information recording channel.
When CD read, optical head will be sought the information recording channel on the CD, i.e. tracking.Behind the optical grating diffraction, light is divided into many bundles, and wherein centre brightness maximum is successively decreased more outward successively.Tracking is about to the beam alignment information recording channel of central principal maximum.During tracking, the embodiment of the invention utilizes the secondary large-signal on both sides to obtain tracking information, gives servomotor with information feedback, makes central principal maximum light intensity alignment information recording channel by the driven by servomotor optical head, finishes tracking.
2. biasing light path system
Choose polarization splitting prism (PBS) as the optical polarization element in the biasing light path system, and the polarization splitting prism of choosing (PBS) is single wavelength polarization splitting prism.The operation wavelength correspondence of each single wavelength polarization splitting prism the wavelength of relevant LASER Light Source.
As shown in Figure 3, the optical axis direction of optical element is parallel to the plane, and then the polarized component perpendicular to plane vibration is reflected, and the polarized component that is parallel to optical axis direction vibration directly sees through.
Single wavelength polarization splitting prism is the polarization splitting prism that certain operating wavelength range is arranged.Laser beam in the operation wavelength is during by single wavelength polarization splitting prism, be reflected perpendicular to the polarized component of optical axis direction vibration, and the polarized component that is parallel to the optical axis direction vibration directly sees through.When the laser beam in operation wavelength is not by single wavelength polarization splitting prism, directly sees through polarization splitting prism and be not reflected.
3. beam splitter
Selected beam splitter is the Amici prism according to wavelength.The light of different wave length is in same media transfer its refractive index sowing time and inequality.At optics interface place, utilize this principle, the light of two kinds of different wave lengths that first light source and secondary light source are sent sees through respectively and total reflection, thereby it is separated.
4. optical information reads
In two focused light passages systems, add quarter-wave optical phase delay device (λ/4 wave plates) respectively.Incide optical disc surface and during at laser beam reverse the returning in optical disc surface reflection back, laser beam successively passes through λ/4 wave plates twice, then the phase place of laser beam deflects, when it is back to single wavelength polarization splitting prism along light path is reverse, can not be reflected, but directly pass through, finally incide in the middle of the Photodetection system.
As shown in Figure 1, 2, first light-source system is made of DVD light source 1, DVD light source grating 2.The secondary light source system is made of BD light source 3, BD light source grating 4.The biasing light path system is made of first single wavelength polarization splitting prism 5, second single wavelength polarization splitting prism 6, collimation lens 7.8 is the Amici prism according to wavelength.The first focused light passages system is made of first reflecting surface 9, a λ/4 wave plates 10, first object lens 11.The second focused light passages system is made of second reflecting surface 12, the 3rd reflecting surface 13, the 2nd λ/4 wave plates 14, second object lens 15.Optical detection system is made up of cylindrical mirror 16, optical detection device 17.
Usually, first light source and secondary light source adopt ruddiness 650nm and blue light 405nm respectively, and two kinds of light wavelength differences are very big, and optical element is chosen than being easier to.For example " single wavelength polarization splitting prism " can choose GCC-402002 (441.6nm) and GCC-402032 (632.8nm) etc.Single wavelength is meant that operating wavelength range is narrow, and ruddiness 650nm and blue light 405nm are within two kinds of single wavelength polarization splitting prism operating wavelength ranges.Even some wideband polarization Amici prisms also can be competent at the beam split task." according to the Amici prism of wavelength " can choose GCC-401001 etc.
When reading the DVD disc, the laser beam of sending from first light source 1 (being the DVD light source) projects on first single wavelength polarization splitting prism 5 behind DVD light source grating 2.At the interface place of first single wavelength polarization splitting prism 5, the component that vibrates perpendicular to its optical axis direction reflects.Reflection lasering beam is not in the operation wavelength of second single wavelength polarization splitting prism 6, directly by second single wavelength polarization splitting prism 6.Light beam incides on the Amici prism 8 according to wavelength through behind the collimation lens 7.At the beam split interface place according to the Amici prism 8 of wavelength, laser beam directly sees through, then laser beam through first reflecting surface, 9, the one λ/4 wave plates 10 after, be concentrated on optical disc surface by first object lens 11.
Afterwards, laser beam is returned along original optical path is reverse after the optical disc surface reflection.Through first object lens, 11, the one λ/4 wave plates, 10, the first reflectings surface 9, according to the Amici prism 8 of wavelength, collimation lens 7, the second single wavelength polarization splitting prisms 6 incide on first single wavelength polarization splitting prism 5.At this moment, laser beam successively twice through a λ/4 wave plates 10, polarization phase deflects, direction of vibration is parallel with the optical axis direction of first single wavelength polarization splitting prism 5, directly,, incide on the optical detection device 17 through cylindrical mirror 16 by first single wavelength polarization splitting prism 5.The information of light is read by optical detection device 17.
When reading the BD disc, the laser beam of sending from secondary light source 3 (being the BD light source) projects on second single wavelength polarization splitting prism 6 behind secondary light source grating 4 (being BD light source grating).At the interface place of second single wavelength polarization splitting prism 6, the component that vibrates perpendicular to its optical axis direction reflects.Light beam incides on the Amici prism 8 according to wavelength through behind the collimation lens 7.At the beam split interface place according to the Amici prism 8 of wavelength, laser beam is reflected, then laser beam through second reflecting surface, 12, the three reflectings surface, 13, the two λ/4 wave plates 14 after, be concentrated on optical disc surface by second object lens 15.
Afterwards, laser beam is returned along original optical path is reverse after the optical disc surface reflection.Through second object lens, 15, the two λ/4 wave plates, 14, the three reflectings surface, 13, the second reflectings surface 12, according to the Amici prism 8 of wavelength, collimation lens 7 incides on second single wavelength polarization splitting prism 6.At this moment, laser beam successively twice through the 2nd λ/4 wave plates 14, polarization phase deflects, direction of vibration is parallel with the optical axis direction of second single wavelength polarization splitting prism 6, directly, incide on first single wavelength polarization splitting prism 5 () by second single wavelength polarization splitting prism 6.Not in the operation wavelength of first single wavelength polarization splitting prism 5,,, incide on the optical detection device 17 through cylindrical mirror 16 directly by first single wavelength polarization splitting prism 5.The information of light is read by optical detection device 17.
During this time, laser beam does not have extra consumption except that reflection loss, and the efficiency of light energy utilization is higher.
The product feasibility
The present invention has made full use of the performance of each optical component, can effectively utilize luminous energy, and can realize the simplification of blue light optical head light path and the miniaturization of blue light optical head unit.
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; make some alternative or obvious modification that are equal to without departing from the inventive concept of the premise; and performance or purposes are identical, then should be considered as belonging to the protection domain that the present invention is determined by claims of being submitted to.
Claims (7)
1. blue light optical head, comprise first light-source system (1 with first wavelength, 2), the first focused light passages system (9,10,11), secondary light source system (3 with second wavelength, 4), the second focused light passages system (12,13,14,15) and survey light path system (16,17), it is characterized in that: also comprise biasing light path system (5,6,7), beam splitter (8), and the described first focused light passages system (9,10,11) include λ/4 wave plates (10) in, the described second focused light passages system (12 corresponding to first wavelength, 13,14,15) include λ/4 wave plates (14) in corresponding to second wavelength; Described first light-source system (1,2) can incide biasing light path system (5,6,7) by the different inlets of biasing light path system (5,6,7) respectively with the light that secondary light source system (3,4) is sent, after the outgoing of biasing light path system (5,6,7), then can inject beam splitter (8), after beam split, can incide first focused light passages system (9,10,11) or the second focused light passages system (12,13,14,15) separately along same light path; The reflected light of disc can reversely respectively turn back to first focused light passages system (9,10,11) or the second focused light passages system (12,13,14,15), and reverse by beam splitter (8), biasing light path system (5,6,7), enter and survey light path system (16,17).
2. blue light optical head as claimed in claim 1, it is characterized in that: described first light-source system (1,2) comprises first light source (1) and the first light source grating (2), secondary light source system (3,4) comprises secondary light source (3) and secondary light source grating (4), light through the first light source grating (2) or secondary light source grating (4) diffraction after, incide in biasing light path system (5,6,7) with central principal maximum diffraction light, as reading/information carrier of recording disk information; With the control signal carrier of secondary maximum diffraction light as blu-ray drives optical head servo controller.
3. blue light optical head as claimed in claim 2 is characterized in that: the light wavelength that secondary light source (3) penetrates is shorter than the light wavelength that first light source (1) penetrates; The angle of divergence of first light source (1) emission light beam is littler than the angle of divergence of described secondary light source (3) emission light beam; The first light source grating (2) is identical with the used grating performance parameter of secondary light source grating (4).
4. blue light optical head as claimed in claim 1 or 2 is characterized in that: biasing light path system (5,6,7) comprising: the first optical polarization element (5) is used for the light beam that first light-source system (1,2) sends is turned back to the light path system axis direction; The second optical polarization element (6) is used for the laser beam that secondary light source system (3,4) sends is turned back to the light path system axis direction; Optical lens (7) is used for the described beam splitter of directive after the beam collimation (8).
5. blue light optical head as claimed in claim 4 is characterized in that: the described first optical polarization element (5) is single wavelength polarization splitting prism with the described second optical polarization element (6); The light wavelength that corresponding described first light-source system of described first optical polarization element (5) operation wavelength (1,2) is sent, the light wavelength that the corresponding described secondary light source system of described second optical polarization element (6) operation wavelength (3,4) is sent.
6. blue light optical head as claimed in claim 1 or 2 is characterized in that: beam splitter (8) is the Amici prism according to wavelength; The light beam with first wavelength that described beam splitter (8) sends first light-source system (1,2) is injected the first focused light passages system (9,10,11), and the light beam with second wavelength that secondary light source system (3,4) sends is injected the second focused light passages system (12,13,14,15).
7. blue light optical head as claimed in claim 1 or 2 is characterized in that: the first focused light passages system (9,10,11) also comprises first reflecting surface (9) successively and focuses on first object lens (11) of CD along light path; The second focused light passages system (12,13,14,15) also comprises second reflecting surface (12), the 3rd reflecting surface (13) successively and focuses on second object lens (15) of CD along light path.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010137997 CN101807425B (en) | 2010-03-25 | 2010-03-25 | Blue light optical head |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010137997 CN101807425B (en) | 2010-03-25 | 2010-03-25 | Blue light optical head |
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| CN101807425A true CN101807425A (en) | 2010-08-18 |
| CN101807425B CN101807425B (en) | 2013-01-09 |
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| CN 201010137997 Expired - Fee Related CN101807425B (en) | 2010-03-25 | 2010-03-25 | Blue light optical head |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113764010A (en) * | 2021-09-08 | 2021-12-07 | 中国华录·松下电子信息有限公司 | Optical storage blue light optical head with quick read-write function |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2591708Y (en) * | 2002-09-19 | 2003-12-10 | 赵立人 | Blue light reading & writing composite optical head |
| CN1649006A (en) * | 2004-01-23 | 2005-08-03 | 日本先锋公司 | Optical pickup and recording/reproducing apparatus |
| CN1822145A (en) * | 2005-02-03 | 2006-08-23 | 三星电子株式会社 | Optical pickup which is compatible with multiple types of media |
| CN101131826A (en) * | 2006-08-22 | 2008-02-27 | 三星电子株式会社 | Optical pick-up |
| CN101211601A (en) * | 2007-12-25 | 2008-07-02 | 天津三星电子有限公司 | Readable-writable blue light optical disc and optical pick-up head device capable of reading DVD optical disc |
| CN101399058A (en) * | 2007-09-27 | 2009-04-01 | 新科实业有限公司 | Optical pickup head and optical read/write apparatus |
| CN101499295A (en) * | 2008-01-30 | 2009-08-05 | Jds尤尼弗思公司 | Optical pick-up unit with two-mirror phase shifter |
-
2010
- 2010-03-25 CN CN 201010137997 patent/CN101807425B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2591708Y (en) * | 2002-09-19 | 2003-12-10 | 赵立人 | Blue light reading & writing composite optical head |
| CN1649006A (en) * | 2004-01-23 | 2005-08-03 | 日本先锋公司 | Optical pickup and recording/reproducing apparatus |
| CN1822145A (en) * | 2005-02-03 | 2006-08-23 | 三星电子株式会社 | Optical pickup which is compatible with multiple types of media |
| CN101131826A (en) * | 2006-08-22 | 2008-02-27 | 三星电子株式会社 | Optical pick-up |
| CN101399058A (en) * | 2007-09-27 | 2009-04-01 | 新科实业有限公司 | Optical pickup head and optical read/write apparatus |
| CN101211601A (en) * | 2007-12-25 | 2008-07-02 | 天津三星电子有限公司 | Readable-writable blue light optical disc and optical pick-up head device capable of reading DVD optical disc |
| CN101499295A (en) * | 2008-01-30 | 2009-08-05 | Jds尤尼弗思公司 | Optical pick-up unit with two-mirror phase shifter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113764010A (en) * | 2021-09-08 | 2021-12-07 | 中国华录·松下电子信息有限公司 | Optical storage blue light optical head with quick read-write function |
| CN113764010B (en) * | 2021-09-08 | 2024-05-31 | 中国华录·松下电子信息有限公司 | Optical storage blue-ray optical head with rapid reading and writing function |
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