CN1112707A - Optical system for optical pick-up device - Google Patents
Optical system for optical pick-up device Download PDFInfo
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- CN1112707A CN1112707A CN94119082A CN94119082A CN1112707A CN 1112707 A CN1112707 A CN 1112707A CN 94119082 A CN94119082 A CN 94119082A CN 94119082 A CN94119082 A CN 94119082A CN 1112707 A CN1112707 A CN 1112707A
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- lens
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/03—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by deforming with non-mechanical means, e.g. laser, beam of particles
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- Optics & Photonics (AREA)
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Abstract
The invention discloses an optics system for optics readout equipment. The optics system has a six-side polarizing beam splitter positioned between a grating and a collimating lens and substituting the ordinary parallelogram prism. The polarizing beam splitter reflects optics data from an optical disc. The collimating lens of the system at the same time plays a role of ordinary collimating lens and ordinary first return lens. A Wollaston prism is positioned between the second return lens and a light detector and is used to incline to assemble the light from the return lens. In this way, the optics reduces the number of optics elements, is easy for the accurate settings of optics elements and realizes the trend of present optics readout equipment of light weight and compact structure.
Description
The present invention relates generally to optical pick-up device, especially relates to the architecture advances of the optical system that is used for this optical pick-up device, thereby simplifies the structure of optical system and realize that current optical pick-up device is in light weight, the trend of compact conformation.
As in this area, have experience person known, optical pick-up device has been used as the core optical component of some optical devices, as video disc player, mini laser disc player, mini compact disc player and CD player, these equipment go out out with data with data recording to CD and from CD with light beam again.
Referring to Fig. 1, be depicted as a kind of conventional optical system that is used for optical pick-up device.Reference number 1 one of expression is used for luminous laser diode among the figure.This optical system also comprises a grating 2 that is used for the light from laser diode is divided into the three beams of laser bundle.Be provided with a collimation lens 3 in grating 2 fronts, these lens be used to will be divided into by grating 2 laser beam of three beams is parallel is converged to a branch of parallel beam.This optical system also comprise one in the future the parallel beam of self-focus lens 3 converge to object lens 4 on the CD 5.Between collimation lens 3 and object lens 4, be provided with a parallelogram prism, be used for reflecting optical data from CD 5.Parallelogram prism 6 has a polarization beam apparatus surface 60.This optical system also comprises Wollaston (Wollaston) prism 7 that is used for transmitting light, and the path of these light is owing to the reflex of parallelogram prism 6 has changed direction.A pair of backhaul lens, promptly one first backhaul lens 8 and one second backhaul lens 9 are successively set on wollaston prism 7 fronts, like this, from the light of wollaston prism 7 successively by the first and second backhaul lens 8 and 9.Being arranged on before the second backhaul lens 9 is a photo-detector, with the image that generates from the light of second lens 9.
In the use of the optical system of above-mentioned optical pick-up device, be divided into the three beams of laser light beam by grating 2 from the light of laser diode 1.At this moment, in fact grating 2 will be from the light beam after the light beam splitting of laser diode 1 more than three beams.Yet above-mentioned optical system is only used three-beam, that is, and and central light beam (or claiming 0 grade of light beam) and left side and right side light beam (or claiming ± 1 grade of light beam).In above-mentioned optical system, central light beam (or claiming 0 grade of light beam) is used to carry out light focusing and reproduces data, and the light beam on left side and right side (or title ± level light beam) is used to carry out servo tracking.
Be divided into by grating 2 that collimated again lens of light after the three light beams 3 are parallel to be converged to a branch of directional light.The parallel beam that comes self-focus lens 3 is the beam surface 60 by parallelogram prism 6 again.Then, will focus on from the parallel beam of parallel quadrant prism 6 on the CD 5 by object lens 4, like this, this light beam or with optical data recording to CD 5, or carry the optical data that is recorded on the CD 5 and reflected by CD 5.
The light of optical data that carries CD 5 by CD 5 reflection after once more by 6 reflections of parallelogram prism, like this, the light that is changed after the direction by the reflex of prism 6 is just received by wollaston prism 7.By the light behind the wollaston prism 7 again by the first backhaul lens 8 and the second backhaul lens 9, thereby produce on the photo-detector 10 one with CD 5 on the corresponding image of optical data.
In above-mentioned optical system, the first backhaul lens 8 have had with collimation lens the same structure; And the second backhaul lens 9 are cylindrical lenses, are used for forming the focusing operation of an astigmatism image and improvement object lens 4.
Yet, there is a problem in above-mentioned optical system, promptly this system has adopted two optical element-first backhaul lens 8 and collimation lenses 3 that structure is identical, but deficiency aspect the accurate aligning of compact conformation and optical element, optical element just unnecessarily occupies bigger space and Heavy Weight like this.
Therefore, above-mentioned optical system realize that current optical pick-up device is in light weight, deficiency aspect the trend of compact conformation.Another problem of above-mentioned optical system is to have comprised many optical elements in this system, makes complex manufacturingization inevitably, thereby has reduced throughput rate, increased cost.
U.S. Patent No. 5249171 discloses a kind of optical system, and this system can compensate from a kind of light of recording medium reflection in the phasic difference between a linear polarization device and the polarizer vertical with this linear polarization device.In order to compensate this phasic difference, the optical system of the above-mentioned U.S. adopts optical element, as a phase shifter, and a total reflection prism, a total reflection catoptron and a beam splitter.Yet because there are many optical elements in this system, still there is the problem that makes complex manufacturingization, reduction throughput rate and increase cost in it.
Therefore, an object of the present invention is to provide a kind of optical system that is used for optical pick-up device, the problems referred to above can be overcome in this system, this system is provided with the parallelogram prism that six polarization beam apparatus substitute routine between a grating and a collimation lens, make collimation lens play conventional collimation lens and the first conventional backhaul lens simultaneously, between one second backhaul lens and a photo-detector, be provided with a wollaston prism in addition, can reduce the number of optical element like this, be convenient to accurately be provided with these optical elements and realize that current optical pick-up device is in light weight, the trend of compact conformation.
To achieve these goals, corresponding with a preferred embodiment of the present invention, as to be used for an optical pick-up device optical system, comprising: one is used for luminous laser diode; A grating that is used for the light of laser diode is divided into three beams; One is used for the parallel collimation lens that is converged to a branch of directional light of the three-beam of grating; One is used for the directional light of collimation lens is focused on the object lens on the CD; Six polarization beam apparatus that are arranged between grating and the collimation lens, this beam splitter is used to reflect the optical data from CD; The reflex that transmission is polarized beam splitter has changed the flyback lens of direction; The wollaston prism that will tilt to assemble from the light of backhaul lens; And photo-detector that is used for producing the image of a light that is tilted to assemble by wollaston prism thereon.
By the detailed description of carrying out below in conjunction with appended figure, above-mentioned purpose of the present invention and other purpose, feature and other advantage will more be expressly understood, wherein:
Fig. 1 is the sketch of the conventional optical system of an optical pick-up device; And
Fig. 2 is the sketch with the optical system of the corresponding optical pick-up device of a preferred embodiment of the present invention.
Referring to Fig. 2, be depicted as optical system with the corresponding optical pick-up device of a preferred embodiment of the present invention.As shown in the drawing, this optical system comprises six polarization beam apparatus 11 that are arranged between a grating 2 and the collimation lens 3.In optical system of the present invention, collimation lens 3 plays conventional collimation lens and the conventional first backhaul lens simultaneously.In addition, between one second backhaul lens 9 and a photo-detector 10, be provided with a wollaston prism 7.Certainly, optical system of the present invention comprises a semiconductor laser 1 and object lens 4.
In the use of above-mentioned optical system, be divided into three-beam from the light of laser diode 1 by grating 2, that is, and central light beam (or claiming 0 grade of light beam) and left side and right side light beam (or claiming ± 1 grade of light beam).In this optical system, central light beam (or claiming 0 grade of light beam) is used to carry out light focusing and reproduces data, and the light beam on left side and right side (or claiming ± 1 grade of light beam) is used to carry out servo tracking.
By grating 2 be divided into behind the three beams of laser bundle light collimated lens 3 are parallel be converged to a branch of directional light before by six polarization beam apparatus 11.From the collimated again lens 3 parallel parallel beams that are converged to of the light of polarization beam apparatus 11.Come the parallel beam of self-focus lens 3 to be converged on the CD 5 by object lens 4, like this, this light beam or with optical data recording to CD 5, perhaps carry the data that are recorded in CD 5 and reflected by CD 5.Carry the optical data of CD 5 and passed through object lens 4 and collimation lens 3 successively, then again by six polarization beam apparatus oblique reflections and by the second backhaul lens 9 by the light that CD 5 reflects.
Thereby on photo-detector 10, produce an image by wollaston prism 7 again by the light behind the second backhaul lens 9.At this moment, the light path by wollaston prism 7 is a slant path.Also be the light that wollaston prism 7 tilts to assemble from the second backhaul lens 9.
As mentioned above, in the optical system of optical pick-up device of the present invention, between a grating and a collimation lens, adopted six polarization beam apparatus to replace conventional parallelogram prism.In addition, the collimation lens of this optical system plays conventional collimation lens and the first conventional backhaul lens simultaneously, and conventional collimation lens has identical structure with the first conventional backhaul lens.A wollaston prism of this optical system is set between one second backhaul lens and the photo-detector.Therefore, optical system of the present invention has alleviated weight when reducing size.
The collimation lens that this optical system adopts has the suitable light of working as and passes through twice structure back and forth, thereby has reduced the number of this system optics.Moreover wollaston prism and polarization beam apparatus suitably are arranged in the slant path, thereby realize that current optical pick-up device is in light weight, the trend of compact conformation.
In view of the necessity of optical pick-up device at the optical disc surface rapid movement, optical system of the present invention also provides an advantage, and promptly this optical system has the optical element of miniaturization, thereby has reduced the weight and the size of optical element support.Therefore, the weight and the size of the gear train of the optical pick-up device of motion will preferentially be reduced fibrous root inwards and outwards according to the rotation of CD.Have, this optical system makes the peripherals of gear train again, as CD-ROM drive motor, can go to select from miniaturization, low-power equipment.
Although explanation for example, the preferred embodiments of the present invention are disclosed, yet there is experience person will be understood that in this area, under the situation that does not depart from scope of the present invention in the appended claims and spirit, still might carries out multiple correction, interpolation and replacement.
Claims (4)
1, optical system that is used for an optical pick-up device comprises:
One is used for luminous laser diode;
Light with described laser diode is divided into the grating of three beams;
One will be from the parallel collimation lens that is converged to a branch of directional light of the three-beam of grating;
One will focus on the object lens of a CD from the parallel beam of described collimation lens;
A polarization beam apparatus that is arranged between described grating and the described collimation lens, described beam splitter is used for reflecting the optical data from described CD;
Backhaul lens are used for transmitting its light path has been changed direction by the reflex of described polarization beam apparatus light beam;
A wollaston prism is used for the light of convergence from described backhaul lens; And
A photo-detector is used for producing one thereon by the image of the light of described wollaston prism inclination convergence.
2, according to the optical system of claim 1, wherein said wollaston prism is set between described backhaul lens and the described photo-detector.
3, according to the optical system of claim 1, wherein said collimation lens is set between described object lens and the described polarization beam apparatus.
4, according to the optical system of claim 1, wherein said polarization beam apparatus is a hexahedron.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019930030441A KR950020509A (en) | 1993-12-28 | 1993-12-28 | Optical system for optical pickup |
| KR30441/93 | 1993-12-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1112707A true CN1112707A (en) | 1995-11-29 |
Family
ID=19373441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94119082A Pending CN1112707A (en) | 1993-12-28 | 1994-12-17 | Optical system for optical pick-up device |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR950020509A (en) |
| CN (1) | CN1112707A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1314026C (en) * | 2001-08-27 | 2007-05-02 | 皇家飞利浦电子股份有限公司 | Optical scanning device |
-
1993
- 1993-12-28 KR KR1019930030441A patent/KR950020509A/en not_active Application Discontinuation
-
1994
- 1994-12-17 CN CN94119082A patent/CN1112707A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1314026C (en) * | 2001-08-27 | 2007-05-02 | 皇家飞利浦电子股份有限公司 | Optical scanning device |
Also Published As
| Publication number | Publication date |
|---|---|
| KR950020509A (en) | 1995-07-24 |
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