CN1779804A - Optical pickup device - Google Patents
Optical pickup device Download PDFInfo
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- CN1779804A CN1779804A CN 200410084440 CN200410084440A CN1779804A CN 1779804 A CN1779804 A CN 1779804A CN 200410084440 CN200410084440 CN 200410084440 CN 200410084440 A CN200410084440 A CN 200410084440A CN 1779804 A CN1779804 A CN 1779804A
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- light
- light beam
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- optical detector
- picker
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Abstract
A light pick up device is light picker of front monitor photo detector and said light picker consists of laser diode for emitting light beam with different wavelength, beam splitter for selectively penetrating or reflecting beam according to polarization direction of incoming beam, collimator for making beam forward in parallel way, regulator for combining beam and optical disc correctly, light wave detector for interpreting beam reflected by optical disc and monitoring region light wave detector for measuring light amount of multiple beams from laser diode and for using two components to sense light amount in monitoring region.
Description
[technical field]
The invention relates to the invention of the optical take-up apparatus of regeneration or recording disk, particularly comprise the strong and weak correctly invention of the light picker of the monitoring mode optical detector (front monitor photo detector:MPD) of mensuration of the light beam of emitting from laser diode.
[background technology]
Utilize the CD optical characteristics to come the goods of record regenerating information to be generally little rondelle, need CD-ROM drive, regenerate or recording disk information according to the optical take-up apparatus of installing in CD drive for using CD.
This light picker critical piece also comprises the laser diode (LD:Laser Diode) that light takes place, the optical detector of interpretation beam reflected on CD (PD:Photo Detector), and the light shunt that carries out selectively oppositely or pass through according to the light polarization direction.
On the other hand, on CD for correctly in conjunction with light beam, used this device of regulator (actuator).Regulator is to move the object lens position that will be concentrated to the correct point of recorded information on the CD from the light beam that laser diode sends, and improves the regeneration and the record performance of optical information.
In this process, should correctly regulate its power from the light beam that laser diode penetrates.
For this reason, necessity of correct mensuration light beam light quantity is arranged, what used this moment is monitor optical detector (front monitorphoto detector is designated hereinafter simply as MPD).
Its purpose of MPD is a light beam part that penetrates from laser diode to be carried out perception, and as fundamental purpose, measure the light beam light quantity that penetrates.
Described MPD is arranged between laser diode or the object lens, extracts a light beam part that penetrates, and measures the entire light light quantity that penetrates from laser diode.
Thus, described MPD also carries out sufficient SR ratio for little light quantity, even there is voice also correct signal should take place, even can not signal in the output light quantity of maximum saturated.
Fig. 1 is the light beam part abstracting method synoptic diagram that in the past penetrates from laser diode in the optical take-up apparatus.
In Fig. 1 with shown in identical, the light beam that penetrates from laser diode is sent to object lens by light velocity shunt 20 and collimating mirror 40, at this moment, utilizes light beam shunt 20, and the part of light beam is delivered to MPD30.At this moment, decide the light quantity that transmits to MPD30, measure the laser light quantity of from laser diode 10, emitting according to corresponding amount of beam according to the reflection characteristic of light beam shunt 20.
Fig. 2 is for optical take-up apparatus in the past, other explanation synoptic diagram of the light beam part abstracting method that penetrates from laser diode.
With reference to Fig. 2,, extract the other synoptic diagram that describes from the light beam part of laser diode ejaculation for light picker.
With reference to Fig. 2, dispose two laser diodes 10 at Fig. 2, laser diode 10 is for example emitted CD light beam and DVD light beam.
Simultaneously, dispose mirror 50, utilize regulator 70 that light beam is combined with the CD tram by collimating mirror 40.
Adapt therewith, combine with optical detector by mirror 50, prism 60, light beam shunt 20, cylindrical lens 80 from the light beam of CD reflection.
The optical take-up apparatus identical with last formation, MPD30 are arranged on prism 60 or mirror 50 back.
At this moment, according to position or the direction of MPD30, because the saturated of light quantity can take place, so also can be arranged on the position that certain distance is arranged apart from beam direction.
In addition, use two MPD30, can make MPD30 be positioned at optimum position for each light beam.In this case, owing to use two MPD30, the expense that makes increases, and the position of its setting also is restricted.
Decide by the amplification factor of injecting the light beam light quantity and light part percent of pass with the position of last identical MPD30, identical with optical pickup, also be subjected to many restrictions so be construed as limiting its position on its instrument.
Identical therewith is, utilizes one MPD30, when measuring the light quantity of each light beam, can take place saturatedly for specific light beam, also the quantity of incident light deficiency can take place for specific light beam.
[summary of the invention]
The present invention has carried out corresponding research and development for solving top existing problem, and optical Pickup device of the present invention includes the monitor optical detector, and it makes each light beam that sends from laser diode that the phenomenon that light quantity is saturated or light is not enough not take place.
In addition, the position of monitor optical detector of the present invention also can move freely, and makes the restriction that is subjected in the design of light picker drop to minimum.
For achieving the above object, comprise as lower device: be used for information record or regeneration, have light beams of different wavelengths, dispose one or more laser diodes for emitting according to its formation of light picker of the present invention; Polarization direction according to incident beam passes through light or beam reflected shunt selectively; Make parallel beam carry out the ground collimating mirror; The regulator that light beam is correctly combined with CD; The optical detector of the light beam that interpretation goes out from CD reflection; Be to measure a plurality of light beam light quantities of emitting from laser diode, the cellular zone of perception light quantity disposes the above and surveillance zone optical detector that forms of two parts at least.
In addition, the cellular zone of described monitor optical detector is divided into three part formation.
In addition, the monitor optical detector is distinguished the unit area that forms and is only measured the light quantity of particular beam separately above.
In addition, described monitor optical detector is distinguished the light beam light quantity of an area test more than two kinds in the cellular zone that forms.
In addition, the zone that the cellular zone of described monitor optical detector is divided into two parts forms, and only measures the light quantity of a light beam in, the light quantity of mensuration more than two kinds in other zone the unit therein in.
In addition, the cellular zone of described monitor optical detector is divided into three parts and is formed, and wherein measures the light beam light quantity more than two kinds in the zone of at least one.
In addition, when the cellular zone of described monitor optical detector is divided into two parts, above the zone of two parts be divided into the zone of measuring DVD light beam and CD light beam, and the zone of measuring DVD light beam or CD light beam light quantity.
In addition, the cellular zone of described monitor optical detector is divided into two parts and forms, and two parts are respectively to measure the DVD light beam, the CD light beam, the light quantity district of at least two above light beams in the BD light beam, and measure DVD light beam, a kind of zone of light beam light quantity in CD light beam, the BD light beam.
In addition, when the cellular zone of described monitor optical detector is divided into three parts, above measure the light beam light quantity more than at least two kinds in DVD light beam, CD light beam, the BD light beam at least one the zone in three part territories.
In addition, described laser diode disposes light path line revisal means, is to emit the light beam of different wave length more than two kinds separately, and makes the light beam light circuit more than two kinds consistent.
In addition, described laser diode disposes the prism more than two at least, and it is to make the beam course separately of emitting from laser diode consistent.
Advantage of the present invention is, can measure the light quantity of incident light wave detector by the size of change unit, and can free selective light wave detector design attitude, and well revisal because the light quantity problem that instrumental error causes.
[description of drawings]
Fig. 1 is the key diagram that in the past extracted a light beam part that radiates in the optical take-up apparatus from laser diode;
Fig. 2 is for optical take-up apparatus in the past, extracts the other example of beam method that penetrates from laser diode;
Fig. 3 is the explanation synoptic diagram according to optical take-up apparatus of the present invention;
Fig. 4 is according to optical take-up apparatus of the present invention, and MPD implements the synoptic diagram of example;
Fig. 5 is for optical take-up apparatus of the present invention, the synoptic diagram that CD CELL district and DVD CELL zone are distinguished in addition;
Fig. 6 is according to optical take-up apparatus of the present invention, and the use of three-wavelength light beam is described;
Fig. 7 is in the optical take-up apparatus of three-wavelength light beam use, is used to measure the MPD examples of implementation of light quantity;
Fig. 8 is that other that measure light quantity in the optical take-up apparatus that uses of three-wavelength light beam implemented example.
[embodiment]
Below, with reference to institute's accompanying drawing, to being described in detail according to optical take-up apparatus of the present invention.
Fig. 3 is the explanation synoptic diagram according to light picker of the present invention.
With reference to Fig. 3, comprise as lower device according to its formation of optical take-up apparatus of the present invention: the laser diode 110 of emitting the specific wavelength light beam; See through selectively or the light beam shunt 120 of folded light beam according to the polarization direction of incident beam; Make the corresponding to prism 160 of beam course of from two above laser diodes 110, emitting; Mirror 150; Make the collimating mirror 140 of parallel beam operation; Make light beam correctly be concentrated to regulator 170 on the CD position; Make the cylindrical lens 180 that generates boiling point from the light beam of CD reflection; The optical detector 190 of perception light beam; Mensuration is from the MPD130 of the light beam light quantity of laser diode 110 ejaculations.
Described MPD can be arranged on the side or the back side of described smooth shunt 120, prism 160, mirror 150, and the position that described MPD130 is provided with is different and different according to the design of optical take-up apparatus.
Just, require miniature optical take-up apparatus recently, and miniature light picker is subjected to severely restricts for being provided with on its position of described MPD.
Light beam light quantity for correct measurement is emitted from laser diode 110 should be positioned at MPD130 on the correct position, considers locational restriction situation, and selecting one, not have the saturated point of light be very difficult.
Particularly, when measuring two kinds of light beams,, but may be to produce the saturated point of light or the point of light deficiency for another kind of light beam even be positioned at best position for a kind of light beam MPD with a MPD130.
Thus, for measure the light quantity of two kinds of light beams by a MPD130, the selection of its position is not very easy.
Be to develop the optical take-up apparatus that uses three kinds of light beams recently, in this case therewith accordingly, measure light quantity with a MPD, or measure light quantities with two MPD, with last identical, the position restriction that all will be designed, light is saturated and condition effect such as light deficiency.
Fig. 4 is according to optical take-up apparatus of the present invention, the synoptic diagram of the enforcement example of MPD130.
The formation of light picker of the present invention can correctly be measured the light quantity of two kinds of light beams by a MPD130.The actinometry zone of MPD130 is divided into two parts and constitutes.
Such as, but the optimum of CD light beam incident can be selected in the position of MPD130, is determined at this locational DVD light beam light quantity.
That is, in the A of Fig. 4 example, " CD cell zone " is the zone of measuring CD light beam light quantity, " the DVD cell zone " that comprises " CD cell zone " by mensuration DVD light beam light quantity can the revisal deficiency light quantity.
Example shown in Fig. 4 B is its opposite situation.
At this moment, Fig. 4 A " CD cell zone " measures the light quantity of CD light beam and the light quantity of DVD light beam, and uses, and only measures the light quantity of DVD light beam except " the DVD cell zone " in " CD cell zone ".
Identical therewith MPD actinometry district can divide into the configuration of cell or the method for circuit.
In " DVD cell zone " design of " the CD cell zone " of the A of Fig. 4 and B for the light quantity of CD light beam and DVD light beam is all measured, in the enforcement example different with Fig. 4 example, same as shown in Figure 5, can distinguish formation " CD cell zone " and " DVD cell zone " respectively.
The light quantity of light beam separately can be measured in this situation " CD cell zone " and " DVD cell zone ", and Qu Yu size can be carried out suitable change according to the light quantity of incident beam separately.
For example, during CD light beam light quantity not sufficient, can measure the light quantity of CD light beam in " DVD cell zone ".
Identical therewith the present invention is for optical take-up apparatus, by the zone of distinguishing assay to the light quantity of light beam separately of MPD130 incident, make MPD that the position is set is more flexible, can prevent that light is saturated or light is not enough, also can measure light quantity.
In addition, quantitative determination is illustrated to light beam light in enforcement example of the present invention, and Fig. 6 is to use the synoptic diagram of the optical take-up apparatus of three kinds of light beams.
As with shown in Figure 3 comparing, emit the light beam of two wavelength from a laser diode 110, a kind of in this case light beam can be the BD light beam as the words of giving an example, and is corresponding therewith, can append the optical link revisal means 111 that are used for revisal light beam circuit.
Fig. 7 says for the optical take-up apparatus that uses three kinds of wavelength light beams, measures the enforcement example of the MPD130 of light quantity.
Words as reference Fig. 7, the BD light beam carries out light quantity in " BD cell zone " and detects, the CD light beam carries out light quantity in " CDcell zone " and " BD cell zone " and detects, and simultaneously, the DVD light beam can be measured in " CD cell zone ", " BD cell zone " and " DVD cell zone ".
If, with in the identical design environment, if the light quantity of DVD light beam is saturated, the light quantity of DVD light beam is only measured in " CD cell zone " and " DVD cell zone ".
Fig. 8 is other enforcement example that is used to measure light quantity in the optical take-up apparatus that uses three-wavelength, MPD130 is distinguished two zones, the light quantity of BD light beam and CD light beam is measured in " BD and CD cell zone ", and the light quantity of DVD light beam is measured in " DVD cell zone ".
If with in the identical design environment, the deficiency in light quantity of DVD light beam can be measured in " BD and CD cell zone " and " DVD cell zone ".
That is, the invention process example when the quantitative determination of three-wavelength light beam light, is distinguished the MPD cellular zone more than two at least, and the light quantity of an above light beam is measured in a zone at least, can satisfy the restriction in actinometry and the instrument design correctly.
Adapt configurable a plurality of laser diodes of emitting a wavelength light beam, an also configurable laser diode of emitting a plurality of wavelength light beams therewith.
By above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.Therefore, the technical scope of this invention can not be confined to the detailed description on the detailed book; Must determine its technical scope according to the scope of patented claim.
Claims (11)
1, light picker comprises:
Be used for information record or regeneration, have light beams of different wavelengths, dispose one or more laser diodes for emitting;
Polarization direction according to incident beam passes through light or beam reflected shunt selectively;
Make parallel beam carry out the ground collimating mirror;
The regulator that light beam is correctly combined with CD;
The optical detector of the light beam that interpretation goes out from CD reflection;
Be to measure a plurality of light beam light quantities of emitting from laser diode, the cellular zone of perception light quantity disposes the above and surveillance zone optical detector that forms of two parts at least.
2, as claim item 1 described light picker, it is characterized in that,
The cellular zone of described monitor optical detector is divided into three parts and is formed.
3, as claim item 1 described light picker, it is characterized in that,
Described monitor optical detector is distinguished the unit area that forms and is only measured the light quantity of particular beam separately.
4, as claim item 1 described light picker, it is characterized in that,
Described monitor optical detector is distinguished the light beam light quantity of an area test more than two kinds in the cellular zone that forms.
5, as claim item 1 described light picker, it is characterized in that,
The zone that the cellular zone of described monitor optical detector is divided into two parts forms, and only measures the light quantity of a light beam in, the light quantity of mensuration more than two kinds in other zone the unit therein in.
6, as claim item 1 described light picker, it is characterized in that,
The cellular zone of described monitor optical detector is divided into three parts and is formed, and wherein measures the light beam light quantity more than two kinds in the zone of at least one.
7, as claim item 1 described light picker, it is characterized in that,
When the cellular zone of described monitor optical detector was divided into two parts, the zone of described two parts was divided into the zone of measuring DVD light beam and CD light beam, and the zone of measuring DVD light beam or CD light beam light quantity.
8, as claim item 1 described light picker, it is characterized in that,
The cellular zone of described monitor optical detector is divided into two parts and forms, and two parts are respectively to measure the DVD light beam, the CD light beam, and the light quantity district of at least two above light beams in the BD light beam, and measure DVD light beam, a kind of zone of light beam light quantity in CD light beam, the BD light beam.
9, as claim item 1 described light picker, it is characterized in that,
When the cellular zone of described monitor optical detector is divided into three parts, above measure the light beam light quantity more than at least two kinds in DVD light beam, CD light beam, the BD light beam at least one the zone in three part territories.
10, as claim item 1 described light picker, it is characterized in that,
Described laser diode disposes light path line revisal means, is to emit the light beam of different wave length more than two kinds separately, and makes the light beam light circuit more than two kinds consistent.
11, as claim item 1 described light picker, it is characterized in that,
Described laser diode disposes the prism more than two at least, makes the beam course of sending from laser diode separately consistent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410084440 CN1779804A (en) | 2004-11-24 | 2004-11-24 | Optical pickup device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410084440 CN1779804A (en) | 2004-11-24 | 2004-11-24 | Optical pickup device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1779804A true CN1779804A (en) | 2006-05-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410084440 Pending CN1779804A (en) | 2004-11-24 | 2004-11-24 | Optical pickup device |
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|---|---|
| CN (1) | CN1779804A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101165793B (en) * | 2006-10-18 | 2011-02-16 | 日立视听媒介电子股份有限公司 | Optical pickup and optical information recording and reproducing device |
-
2004
- 2004-11-24 CN CN 200410084440 patent/CN1779804A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101165793B (en) * | 2006-10-18 | 2011-02-16 | 日立视听媒介电子股份有限公司 | Optical pickup and optical information recording and reproducing device |
| US8154962B2 (en) | 2006-10-18 | 2012-04-10 | Hitachi Media Electronics Co., Ltd. | Optical pickup and optical information recording and reproducing device |
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