CN1270304C - Optical head - Google Patents
Optical head Download PDFInfo
- Publication number
- CN1270304C CN1270304C CN 200410089333 CN200410089333A CN1270304C CN 1270304 C CN1270304 C CN 1270304C CN 200410089333 CN200410089333 CN 200410089333 CN 200410089333 A CN200410089333 A CN 200410089333A CN 1270304 C CN1270304 C CN 1270304C
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- Prior art keywords
- plane
- glass body
- optical path
- sheet glass
- laser
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- 230000003287 optical effect Effects 0.000 title claims abstract description 56
- 239000005357 flat glass Substances 0.000 claims abstract description 21
- 239000004065 semiconductor Substances 0.000 claims abstract description 9
- 230000005540 biological transmission Effects 0.000 claims description 9
- 239000011521 glass Substances 0.000 abstract 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 241000931526 Acer campestre Species 0.000 description 1
- 241001300078 Vitrea Species 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
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- Optical Head (AREA)
Abstract
一种用于数字通用光盘DVD的光学头，在一主光路上依次设有光盘、物镜、准直镜和组合玻璃体；该组合玻璃体由第一平板玻璃体和第二玻璃体粘合而成，一能发射波长为650nm和780nm激光集成半导体激光器位于第一平板玻璃体的对面，其输出光束垂直于主光路入射第一平板玻璃体的第一平面；一光电探测器粘贴在第二玻璃体的一侧面上，经该第二玻璃体的第二平面全反射的信号光入射该光电探测器。本发明具有结构简单，元件较少，体积较小，组装方便的特点。
An optical head for a digital versatile disc DVD is provided with an optical disc, an objective lens, a collimating lens and a combined glass body in sequence on a main optical path; the combined glass body is formed by bonding a first flat glass body and a second glass body, an integrated semiconductor laser capable of emitting lasers with wavelengths of 650nm and 780nm is located opposite to the first flat glass body, and its output light beam is incident on the first plane of the first flat glass body perpendicular to the main optical path; a photoelectric detector is attached to a side surface of the second glass body, and the signal light totally reflected by the second plane of the second glass body is incident on the photoelectric detector. The invention has the characteristics of simple structure, less components, small volume and convenient assembly.
Description
Technical field
The present invention relates to CD player, particularly a kind of digital versatile disc dvd pickup head.
Background technology
Optical storage technology is to adopt the mode of optics to record the information on the CD and can be with the technology of information regeneration, and the carrier of information is a photon.Optical head is the critical component that information writes and reads in the optical storage system, and its optical system comprises: LASER Light Source, and emission is used to read the light beam of CD; Shaping optical element and focusing optical element are used for laser beam shaping and focusing, also have optical detection device, are used to extract cd-rom recording of information and servosignal.Development along with information processing and memory technology, require the access speed of optical storage system to improve greatly, and a method of raising optical head access speed is exactly the weight that reduces optical head, thereby reduces inertia, make it can track fast, focus on, reduce the servo time.Dvd system must can be backward compatible, can compatible CD, and the dual-system structure of single light source as United States Patent (USP) 5446565, generally no longer adopts now, and the luminous energy of such light beams is disperseed to be used to read different CDs, and luminous energy is lower, servo-drive system is required high.All adopt the dual-wavelength laser light source as present dvd pickup is first, as the HOP1000 type, the used laser of DVD is the ruddiness of 650nm, and the optical maser wavelength that CD uses is 780nm, the optical element of tradition dvd pickup head is respectively the LASER Light Source of 650nm and 780nm except wavelength, collimating mirror, outside object lens and the detector, general also have light path to be coupled, adjust element such as beam splitter prism, semi-transparent semi-reflecting lens and catoptron, grating etc., the optical element of total system is many, itself all has certain volume and weight laser instrument and optical element, and between each element certain distance to be arranged, therefore make the volumetric expansion of whole optical head, weight increases, track thereby make, the time lengthening of focus servo, manufacturing cost are also higher.In addition, each element also needs accurate calibration, could guarantee not produce extra aberration, and this has also just increased difficulty technically.
Summary of the invention
The objective of the invention is provides a kind of optical head in order to solve above-mentioned prior art problems, and it should be simple in structure, and element is few, and volume is little, two light source dvd pickup heads easy to assembly.
For finishing above-mentioned purpose, technical solution of the present invention is as follows:
A kind of optical head comprises a main optical path, it is characterized in that being provided with CD, object lens, collimating mirror and combination vitreum successively at this main optical path; This combination vitreum is combined by the first sheet glass body and secondary vitreous, first plane of the described first sheet glass body and second plane parallel and at 45 with described main optical path, second plane of first plane of this secondary vitreous and the first sheet glass body is pasted together, second plane of this secondary vitreous and the degree of tilt of main optical path are bigger, just when burnt satisfy, the reflected light of CD is produced total reflection; One can emission wavelength is the opposite that the laser of 650nm and integrated semiconductor laser that wavelength is the laser of 780nm are positioned at the described first sheet glass body, its output beam is perpendicular to first plane of the described first sheet glass body of main optical path incident, first plane of the described first sheet glass body is to transmission of light part and the partial reflection of 650nm, light to 780nm is anti-reflection, second plane partly sees through and partial reflection the light of 780nm, and is anti-reflection to the light of 650nm; One photodetector sticks on the side of secondary vitreous, through this photodetector of flashlight incident of the second plane total reflection of this secondary vitreous.
780nm that described integrated semiconductor laser sends and the laser of 650nm are positioned at same vertical plane.
Described object lens are installed on the actuator.
The used optical element of the present invention lacks a lot than the traditional optical head, and first vitreum, secondary vitreous and detector be pasted together, and adjusts just to be easier to, and optical texture is also simpler.
Description of drawings
Fig. 1 is an optical head synoptic diagram of the present invention
Embodiment
The invention will be further described below in conjunction with accompanying drawing, but should not limit protection scope of the present invention with this.See also Fig. 1 earlier, Fig. 1 is an optical head synoptic diagram of the present invention, as seen from the figure, optical head of the present invention, comprise a main optical path, be provided with CD 17, object lens 16, collimating mirror 15 and combination vitreum successively at this main optical path, this combination vitreum is combined by the first sheet glass body 13 and secondary vitreous 14, first plane 131 of the described first sheet glass body 13 is parallel and at 45 with described main optical path with second plane 132, the distance of suitable two reflectings surface of adjustment can make the optical axis coincidence of 780nm and 650nm light beam; First plane 141 of this secondary vitreous 14 and second plane 132 of the first sheet glass body 13 are pasted together, second plane 142 of this secondary vitreous 14 is bigger with the degree of tilt of main optical path, satisfy positive when burnt, reflected light to CD 17 produces total reflection, one energy emission wavelength is the opposite that the integrated semiconductor laser 10 of the laser 11 of 650nm and the laser 12 that wavelength is 780nm is positioned at the described first sheet glass body 13, its output beam is perpendicular to first plane 131 of the described first sheet glass body 13 of main optical path incident, transmission of light part and the partial reflection of the 131 couples of 650nm in first plane of the described first sheet glass body 13, light to 780nm is anti-reflection, the light of the 132 couples of 780nm in second plane partly sees through and partial reflection, and is anti-reflection to the light of 650nm; One photodetector 18 sticks on the side 143 of secondary vitreous 14, through this photodetector 18 of flashlight incident of second plane, 142 total reflections of this secondary vitreous 14.
780nm that described integrated semiconductor laser 10 sends and the laser of 650nm are positioned at same vertical plane.Described object lens 16 are installed on the actuator (not shown).It can be focused between the CD system different with DVD.
In the present invention, the inclination at 45 of bonding vitreum and main optical path is placed, and the distance h of 13 liang of reflectings surface of dull and stereotyped first vitreum is done suitable selection, so that two laser beams optical axis coincidence after reflection.Optical axis coincidence has reduced the centrifugal error of collimation mirror 15 and object lens 16, and optical axis also overlaps on detector 18 simultaneously, is convenient to extract signal.
As shown in Figure 1, the course of work of the present invention is: for the DVD reading system, it is 650nm laser 11 that at first integrated semiconductor laser 10 sends wavelength, after 131 reflections of first reflecting surface and transmission of first vitreum 13, reflected light enters the main shaft light path, after collimating mirror 15 collimations and object lens 16 focusing, on the recording layer 171 of DVD CD 17, assemble, the reflected light that carries cd-rom recording of information then passes through object lens 16 successively, behind the collimating mirror 15, by first reflecting surface 131 secondary reflection and the transmission again of first vitreum 13, transmitted light passes first vitreum 13 and secondary vitreous 14, total reflection on second plane 142, reflected light is received by photodetector 18, extracts DVD cd-rom recording of information and servosignal; For CD system, it is 780nm laser 12 that integrated semiconductor laser 10 sends wavelength, first plane, 131 transmissions through first vitreum 13, transmitted light is again by after 132 part transmissions of the second plane face and the reflection, reflected light sees through the reflected light optical axis coincidence of 131 backs, first plane and above-mentioned 650nm again, collimation through collimating mirror 15 and object lens 16 focuses on, and assembles on the recording layer 172 of CD CD 17; After the reflected light of the recording layer 172 of CD CD 17 then passes through object lens 16, collimating mirror 15 successively, first 131 transmission and reflection once more on second 132 by first vitreum 13, transmitted light total reflection on the face 142 of secondary vitreous 14, reflected light is received by photodetector 18, to extract the recorded information and the servosignal of CD CD.This system adopts the critical angle method focus servo, and DVD adopts the DPD tracking servo, and the road tracking signal of CD adopts the method for recommending to extract.
According to foregoing description, optical element of the present invention is simple and quantity is few, so optical head of the present invention is in light weight, and optical texture is simple, and LASER Light Source is integrated, and first vitreum 13 and secondary vitreous 14 and detector 18 are pasted together, so volume is also less.Vitrea is plane, and aberration can be controlled at below 0.01 λ, therefore little to the influence of picture element.
Claims (3)
1, a kind of optical head, comprise a main optical path, it is characterized in that being provided with CD (17) successively at this main optical path, object lens (16), collimating mirror (15) and combination vitreum, this combination vitreum is combined by the first sheet glass body (13) and secondary vitreous (14), first plane (131) of the described first sheet glass body (13) is parallel and at 45 with described main optical path with second plane (132), first plane (141) of this secondary vitreous (14) is pasted together with second plane (132) of the first sheet glass body (13), when positive Jiao is satisfied with the degree of tilt of main optical path in second plane (142) of this secondary vitreous (14), reflected light to CD (17) produces total reflection, one energy emission wavelength is the side that the integrated semiconductor laser (10) of the laser (11) of 650nm and the laser (12) that wavelength is 780nm is positioned at the described first sheet glass body (13), its output beam is perpendicular to first plane (131) of the described first sheet glass body (13) of main optical path incident, first plane (131) of the described first sheet glass body (13) is to transmission of light part and the partial reflection of 650nm, light to 780nm is anti-reflection, second plane (132) is to transmission of light part and the partial reflection of 780nm, and is anti-reflection to the light of 650nm; One photodetector (18) sticks on the side (143) of secondary vitreous (14), through this photodetector of flashlight incident (18) of second plane (142) total reflection of this secondary vitreous (14).
2, optical head according to claim 1 is characterized in that 780nm that described integrated semiconductor laser (10) sends and the laser of 650nm are positioned at same vertical plane.
3, optical head according to claim 1 is characterized in that described object lens (16) are installed on the actuator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410089333 CN1270304C (en) | 2004-12-09 | 2004-12-09 | Optical head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410089333 CN1270304C (en) | 2004-12-09 | 2004-12-09 | Optical head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1619670A CN1619670A (en) | 2005-05-25 |
| CN1270304C true CN1270304C (en) | 2006-08-16 |
Family
ID=34766197
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410089333 Expired - Fee Related CN1270304C (en) | 2004-12-09 | 2004-12-09 | Optical head |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1270304C (en) |
-
2004
- 2004-12-09 CN CN 200410089333 patent/CN1270304C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1619670A (en) | 2005-05-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: SHANGHAI OPTICS AND PRECISION MECHANICS INSTITUTE Free format text: FORMER OWNER: SHANGHAI OPTICS AND PRECISION MECHANICS INSTITUTE, CHINESE ACADEMY OF SCIENCES Effective date: 20080912 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20080912 Address after: Shanghai 800-211 post office mailbox: 201800 Co-patentee after: Shanghai Xinhui Shidai Optical Disk Technology Co., Ltd. Patentee after: Shanghai Institute of Optics and Fine Mechanics.CAS, Chinese Academy of Sciences Address before: Shanghai 800-211 post office mailbox: 201800 Patentee before: Shanghai Optical Precision Machinery Inst., Chinese Academy of Sciences |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060816 Termination date: 20121209 |