CN1245953A - Optical pick-up device and optical recording and/or playback device - Google Patents
Optical pick-up device and optical recording and/or playback device Download PDFInfo
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- CN1245953A CN1245953A CN99118153A CN99118153A CN1245953A CN 1245953 A CN1245953 A CN 1245953A CN 99118153 A CN99118153 A CN 99118153A CN 99118153 A CN99118153 A CN 99118153A CN 1245953 A CN1245953 A CN 1245953A
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0925—Electromechanical actuators for lens positioning
- G11B7/0927—Electromechanical actuators for lens positioning for focusing only
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1372—Lenses
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1372—Lenses
- G11B2007/13725—Catadioptric lenses, i.e. having at least one internal reflective surface
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
- G11B2220/2537—Optical discs
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Head (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
To make an optical pickup device thin by arranging a convergent means convergingly irradiating an optical recording medium with an emission beam from a light emission part between an optical part and an optical path change means. A prism 12 is arranged between a lens 11 and a disk 20, and the drive of the lens 11 in the focal direction F by a biaxial actuator part 15 using an electromagnetic conversion effect is made to the left/right directions for precisely focusing even when the disk 20 is shifted within the range from the highest position 20U to the lowest position 20L due to the warpage of the disk 20. The drive in the tracking direction T by the biaxial actuator part 15 becomes optimum since the height of the lens 11 in the vertical direction T1 does not change. A return beam reflected by the disk 20 is reflected by a prism 12 through a route similar to the emission beam, goes to an optical part 13 through the lens 11 and is made incident on a light receiving part in the optical part 13 to be signal-processed.
Description
The present invention relates to a kind of optical take-up apparatus, this device for example uses that optical recording media such as CD removes recording/reproducing information, the invention still further relates to optical recorder, optical replay device and optical recording and replay device, and these devices have used above-mentioned optical take-up apparatus.
Fig. 5 illustrates the scheme of conventional optical take-up apparatus.
As shown in Figure 5, optical take-up apparatus 50 comprises an optics 54, and the light receiving element 57 that the light-emitting component 56 that it is made of semiconductor laser etc., optical diode etc. constitute, optical splitter 53 etc. are formed.Optical splitter 53 makes the emission light LF of self-emission device 56 to separate with back light LR from CD 60, and back light LR is directed on the light receiving element 57.A twin shaft device is supporting lens (object lens) 51, focusing on from the light of optics 54 on the CD 60, is also supporting the drive coil 55 that drives lens 51.
In this device 50, the drive coil 55 of available twin shaft device drives lens 51, and it is moved at focus direction F or orbital direction T, thereby realizes focus control or seek rail control.
Utilize the method, planned in recent years optical disc applications to computing machine, therefore urgently need do optical devices such as CO-ROM drive unit very thin.
So, for doing conventional optical take-up apparatus 50 very thin, be provided with a prism 52 therein as the device that changes emission light LF and back light LR light path,, emission light LF and back light LR change 90 ° of light paths so that reflecting on the plane of incidence 52A of prism 52.
The following focus control that driving lens 51 in the conventional optical take-up apparatus 50 are described with reference to Fig. 6.
Among Fig. 6, represent to write down usually and the position of the CD 60 reset, and be represented by dotted lines extreme higher position 60U and extreme lower position 60L when CD 60 causes its Level Change because of reasons such as warpages with solid line.In addition, with alignment so above-mentioned three kinds of situations of CD 60 are shown respectively and corresponding to three kinds of situations of the lens 51 of CD 60 these three kinds of situations.
If supposition approximates the height H P of optical take-up apparatus 50 greatly from the upper space 50A of the lens shift position that is equivalent to CD 60 extreme higher position 60U to the height of the radiative lowest surface 50B of the optics 54 that is parallel to CD 60, then minimum requirements has the indicated value of following formula on theoretical yardstick:
HP ≈ 2A (distance that the lens 51 that caused by CD 60 warpages move: i.e. the twice of maximum amount of warpage A)+H (thickness of lens 51)+BD (beam diameter of the emission light LF of optics 54).
In fact, except above-mentioned value, also need comprise the thickness of used miscellaneous part and the tolerance of permission, so its height is higher.
For example, to being used for the optical take-up apparatus of mini disk (CD), A=0.6mm (pressing CD standard defined), H ≈ 2.5mm then, BD ≈ 3mm.
Therefore, the height H P of optical take-up apparatus 50 is the tolerance that HP＞7mm adds permission.
Because the value of H-P has limited the height of the drive unit of supporting optical take-up apparatus, therefore the minimum constructive height of drive unit should have 2/1 inch at present.
As mentioned above, computing machine needs very thin, and particularly notebook computer more needs to approach.Yet according to the above-mentioned arrangement of optical take-up apparatus 50, its attenuate is subjected to the restriction of the thickness H of the amount of warpage A of CD 60 and lens 51.
In order to address the above problem, the object of the present invention is to provide a kind of optical take-up apparatus, it can make thinner, and optical recorder, optical replay device and optical recording and the replay device that uses this optical take-up apparatus is provided.
According to one aspect of the present invention, a kind of optical take-up apparatus is provided, it comprises: an optics is formed by light radiating portion and light receiving part; A convergence apparatus is used for the light that the light radiating portion of collecting optics parts sends, and the illumination of having assembled is mapped on the optical recording media; And a light path modifier, be used to change the light path of the back light of the light that emission light and emission light reflects on illuminated part; Wherein said convergence apparatus is between described optics and described light path modifier.
Optical take-up apparatus according to the invention described above, because convergence apparatus is between optics and light path modifier, therefore, compare with the conventional optical take-up apparatus between the light path modifier in illuminated part with convergence apparatus, the height of optical take-up apparatus of the present invention (thickness) can be done very for a short time.
In addition, for each device in optical recorder of the present invention, optical replay device and optical recording and the replay device, because the height (thickness) of optical take-up apparatus can be done very for a short time, thus use this optical take-up apparatus to record information on the optical recording media or the playback optical recording media on optical recorder, optical replay device and the optical recording of information and the size of replay device also can reduce.
Fig. 1 is the structural representation of major part of the optical take-up apparatus of one embodiment of the invention;
Figure 1A is the organization plan figure of the optical take-up apparatus shown in Figure 1 of looking from the CD side;
Figure 1B is another organization plan figure of the optical take-up apparatus of looking from the CD side;
Fig. 2 is the detailed structure view of optical take-up apparatus shown in Figure 1;
Fig. 3 A to 3C is respectively other several examples of the light path modifier of optical take-up apparatus shown in Figure 1;
Fig. 4 shows the curve map that concerns between the minimum value of focal length, optical take-up apparatus height and the lens numerical aperture when the present invention is used for the CD recording playback;
Fig. 5 is the structural representation of conventional optical take-up apparatus;
Fig. 6 is used for illustrating that optical take-up apparatus shown in Figure 5 is for carrying out the synoptic diagram of focus control mobile lens.
Fig. 1 illustrates the scheme of the optical take-up apparatus major part of one embodiment of the invention.
In addition, optics 13 can be arranged to light radiating portion and light receiving part are incorporated in the shell, and is made on the same substrate, or is arranged to they are formed with hybrid mode, or is arranged to the use microprism, or does other arrangements and all can.The direction of light of sending from optics 13 is arranged essentially parallel to the information recording surface of CD 20.
In the optical take-up apparatus 1 of present embodiment, prism 12 is used to make light path to become upwards as the light path modifier, and this prism is configured between lens 11 and the CD 20.Twin shaft actuator unit 15 has focusing coil, seek the path circle and in focus direction with seek the magnetic flux generation device of rail direction, be used to drive lens 11.
Even also can make and focus on suitable or accurately control in order to be displaced between uppermost position in fig-ure 20U and the upper/lower positions 20L (maximum amount of warpage is A) scope at the CD 20 that causes because of CD 20 warpages shown in Figure 1, make it to be positioned at the direction (arrow F direction among the figure) that is parallel to CD 20 as long as make the twin shaft actuator unit 15 that utilizes the electromagnetism transform effect drive lens 11.
Seeking the driving of rail direction T by twin shaft actuator unit 15, be preferably in perpendicular to the direction of Fig. 1 paper and carry out (because the height of lens 11 does not change, so also be parallel to the direction of CD 20) lens 11.
Figure 1A illustrates the structure of the optical take-up apparatus 1 of looking from CD 20 sides, wherein seeks rail direction T and is taken as T1.In this case, optics 13 is configured on the direction of moving direction S of traversed by optical take-up apparatus 1, wherein, the light path of scioptics 11 trend for and guide rail 30 rectangular directions.
Yet, seek the focusing driving scope of the scope of rail driving less than pact ± 0.6mm, promptly make an appointment with at most ± 0.4mm.
In other words, be taken as the above-below direction T2 shown in Fig. 1 even seek rail direction T, optical take-up apparatus of the present invention is also thin many than conventional equipment.Therefore, always need not be set at paper direction T1 with seeking rail direction T perpendicular to Fig. 1.
Figure 1B illustrates the structure of the optical take-up apparatus 1 of looking from CD 20 sides, wherein seeks rail direction T and is taken as T2.
By arranging twin shaft actuator unit 15 as described above, can drive lens 11 according to the signal on the CD 20.
The light path of the light that sends from the semiconductor laser 56 of optics 13 is below described in the optical take-up apparatus 1.
Emission light is upwards reflection on the reflecting surface 12a at prism 12 behind the lens 11.Emission light is assembled by lens 11, shines after the convergence on the CD 20.
Back light by CD 20 reflections is reflected on the reflecting surface 12a of prism 12, then by turning back to optics 13 with the similar light path of emission light through lens 11.So back light incides on the light receiving part in the optics 13.
By calculating, for example the signal that light receiving part is detected carries out addition, comparison or the like signal Processing, for example can obtain RF signal, focus error signal, seek rail error signal etc.
Optical take-up apparatus 1 according to present embodiment, because lens (object lens) 11 are arranged between prism 12 and the optics 13, thereby the thickness of lens 11 and the stroke that drives lens 11 for focus control do not influence the height H P (from upper surface 1A to lower surface 1B) of optical take-up apparatus 1.Therefore, compare, can reduce the height H P of optical take-up apparatus 1 with conventional equipment.
So, to compare with optical take-up apparatus 50 shown in Figure 5, optical take-up apparatus 1 of the present invention can be made at an easy rate has little size and thin thickness.
In addition, between the focal length of lens 11 and its numerical aperture (NA) following described relation is arranged preferably.
Fig. 2 at length illustrates the optical take-up apparatus 1 of present embodiment.Below referring to Fig. 2 the focal length of lens 11 and the relation between its numerical aperture are described.
The focal length F of lens 11 is meant that signal recording surface 20a from CD 20 is to the optical range between the emission principal plane 11S of lens 11.
As shown in Figure 2, lens 11 can move between position 11A and 11B.The needed gap value of interference between the lens 11 and prism 12 is taken as e1 when lens 11 move on to position 11A in order to avoid, and be avoid the upper space 1A of optical take-up apparatus 1 and the lowest surface 20L of the CD 20 that causes owing to CD 20 warpages between the needed gap value of interference be taken as e2.
Use the method, although some the time CD 20 can appear and maximum amount of warpage A with for the displacement LA that focuses on the lens 11 of adjustment corresponding to the warpage of CD 20 is not harmonious (light on inciding lens 11 becomes the directional light of collimation lens), can think that also maximum amount of warpage is substantially equal to lens moving in the light radiating portion of using in lens and a common pick device.
At this moment, focal length F can use following formula (1) expression:
F=T/n1+A+e2+D/n2+e1+1/2H+A-k ... (1) T in the formula: the thickness of CD 20, n1: the refractive index of CD 20 substrates (transparent substrates), A: the maximum amount of warpage of CD 20, D: the external diameter of lens 11, n2: the refractive index of prism 12 (part that its emission light and back light pass through), H: the thickness of lens 11, k: the optical range between the emission principal plane 11S of the central authorities of lens 11 and lens 11.
Here, if when the minimum theoretical diameter of lens outer diameter D is taken as the beam diameter BD of emission light LF, the outer diameter D of lens can use following formula (2) to represent: D＞BD=2 * NA * F ... (2)
So, can derive the relation of representing by following (3) and (4) formula by formula (1): F＞T/n1+2 * A+e2+2+NA * F/n2+e1+1/2H-k ... (3) F * (1-2 * NA/n2)-T/n1-2 * A＞e2+e1+1/2H-k ... (4)
, can set k and be equal to or greater than 1/2H during lens in design, but must set 2H-k＞0 usually and e1, e2 are equal to or greater than 0.
Minimum value during as actual design is 0 if establish the right side of formula (4), then can derive following formula (5): F＞(T/n1+2 * A)/(1-2 * NA/n2) ... (5)
If decision allows the focal length F of lens 11 and its numerical aperture NA satisfy following formula (5), then the minimum value of the height H P of optical take-up apparatus 1 equals the outer diameter D of lens 11, compares the same thin device with minimum value 2 * a+H+D of the height H P of conventional optical take-up apparatus 50 so can make.
By the way, in the optical take-up apparatus 1 of the foregoing description, the reflection device as 90 ° of the light paths that changes emission light and back light has adopted square prism 12.But,, therefore also can adopt other reflection devices because need only between lens 11 and CD 20, change 90 ° of light paths.
For example, can adopt three kinds of reflection devices shown in Fig. 3 A to 3C.
It is a plate shape level crossing 21 that Fig. 3 A illustrates used.
Fig. 3 B illustrates the prism 22 of the prism 52 that is similar in the conventional equipment shown in Figure 5, and its plane of incidence 22A is used for reflection emission light and back light.
It is prism 23 that Fig. 3 C illustrates used, and makes emission light and back light by its inboard, is reflected by plane of incidence 23A then.
Fig. 3 A and 3B in these situations, because emission light and back light do not pass the inboard of level crossing 21 and prism 22, so the n2 in the formula (5) should be the refractive index (1.0) of air.
Here, as actual numerical value, Fig. 4 shows the relation between the numerical aperture of the minimum value of focal length F, the optical take-up apparatus height H P of the present invention during as the pick-up of CD and lens.
Among Fig. 4, the arrangement as the reflection device of light picker 1 relates separately to the reflection device shown in prism shown in Figure 2 12 and Fig. 3 A to 3C, the refractive index n 2 of light by part is shown respectively among the figure is n2=1.0 (Fig. 3 A and 3B) and n2=1.5 (Fig. 2 and 3C).
In this case, be based on each parameter of CD standard: A (the maximum amount of warpage of CD 20): 0.6mm, T (thickness of CD 20): 1.2mm, n1 (refractive index of the transparent substrates of CD 20): 1.5, n2 (refractive indexes of prism 12 grades):
1.0, for the situation of Fig. 3 A and 3B;
1.5, for the situation of Fig. 2 and 3C.
In Fig. 4, the focal length F of the lens 11 that two ordinate difference representation formulas (5) provide and the minimum value (equaling D) of pick-up thickness HP; And horizontal ordinate is represented the numerical aperture NA of lens 11, and its value is tried to achieve by following formula (6): the F=(T/n1+2 * A)/(D=2 * NA * F of 1-2 * NA/n2) ... (6)
In the curve of Fig. 4; Dotted line is represented the focal length F of lens 11, and solid line is represented the minimum value D of the height H P of pick device.
In addition, the situation of stain and black star representation n2=1.0, monocycle and dicyclo are represented the situation of n2=1.5, and the length value of the numeric representation reality on each mark limit.
At NA=0.45 that is used for usual mini disk and optical maser wavelength is under the situation of 780nm, if adopt the prism (n2=1.5) of Fig. 2 or 3C, when the minimum value of focal length F was 5.0mm, as can be seen from Figure 4, the minimum value of optical take-up apparatus height H P was about 4.5mm.
In addition, clearly, always focal length F need not be this minimum value, as long as it is just passable to satisfy the relation of formula (5).
For example,, then can try to achieve focal length F and be about 5.6mm, the mechanical degree of freedom when this has just increased design optical take-up apparatus 1 if the height H P of optical take-up apparatus is 5mm.
At present, developed a kind of new CD, i.e. DVD (digital video disc), and released market.
In DVD.Minimum flute length, gauge and the diameter ratio etc. of reading light beam are different among the CD, but it is a stable system, because its signal processing technology makes progress.
In the table 1 below, show each comparative illustration of minimum flute length P, gauge Tp, spot definition SS, spot definition SS on the record surface with ratio and the numerical aperture NA of flute length P or gauge Tp of CD and DVD.
In table 1, also show the long relation with spot definition of flute length among the CD or gauge, its situation is set the situation (optical maser wavelength is 780nm and 650nm) that is equivalent to DVD for.Table 1
As shown in Table 1, by making flute length or gauge length and spot definition be equivalent to the situation of DVD, and by use the signal processing technology that is similar to DVD effectively, even under the CD situation, numerical aperture NA in the time of also for example optical maser wavelength being 780nm drop to about 0.33 and the numerical aperture NA when for example optical maser wavelength being 650nm drop to about 0.28.
Therefore, even to the scheme (scheme shown in Fig. 3 A or the 3B) of the optical take-up apparatus 1 of n2=1.0 shown in Figure 4, also the minimum value D of the height H P of optical take-up apparatus 1 can be set for and be equal to or less than 5mm.
When the numerical aperture NA of convergence apparatus is set at less than general value (promptly in above-mentioned 0.28-0.45 scope), can make optical take-up apparatus have thin thickness.
Have again, at this moment, widen for inclined to one side Jiao's the tolerance that reads characteristic, but thereby constriction focusing speech clothes band.
When arrange a kind of optical devices utilize optical take-up apparatus of the present invention go playback of recorded on optical recording media information or when recording information on the optical recording media, when promptly making a kind of optical recorder, optical replay device and optical recording and replay device, can make and do very thinly, thereby reduce whole optics device size for the driver of used by optical recording medium.
According to the invention described above, be arranged between optics and the light path modifier owing to will assemble device, thereby for making the shift motion that focuses on suitable convergence apparatus can not influence the height of optical take-up apparatus.So, can be made into the thin optical take-up apparatus that prior art is not accomplished.
In addition, when the numerical aperture of convergence apparatus adopts littler value less than general value, can make thin optical take-up apparatus, also owing to the characteristic tolerance of reading to inclined to one side Jiao broadens, but thereby constriction focus servo band.
Below with reference to description of drawings most preferred embodiment of the present invention, should be appreciated that just the present invention is not limited to the foregoing description, those of ordinary skill can made various modifications to the foregoing description under the spiritual scope of appended claims.
Claims (22)
1. optical take-up apparatus comprises:
An optics is formed by light radiating portion and light receiving part;
A convergence apparatus is used to assemble the light that the light radiating portion from described optics sends, and it is shone on the optical recording media;
A light path modifier is used to change emission light and by the light path of optical recording media reflected emitted light back light;
Wherein, described convergence apparatus is arranged between described optics and the described light path modifier.
2. optical take-up apparatus as claimed in claim 1 is characterized in that, also comprises a drive unit, is used to drive described convergence apparatus, by driving this convergence apparatus and carry out focus control being arranged essentially parallel on the optical recording media direction.
3. optical take-up apparatus as claimed in claim 2 is characterized in that, described drive unit also by be arranged essentially parallel to the optical recording media direction and perpendicular to the direction of focus control direction on drive described convergence apparatus and seek rail control.
4. optical take-up apparatus as claimed in claim 1, it is characterized in that, the focal length of setting convergence apparatus is F, its numerical aperture is NA, the substrate thickness of illuminated part is T, and its refractive index is n1, and its maximum amount of warpage is A, the refractive index of the part of the emission light path modifier that light and back light passed through is n2, then takes off the row relational expression:
F＞(2×A+T/n1)/(1-2×NA/n2)
5. optical take-up apparatus as claimed in claim 4 is characterized in that, the numerical aperture NA of described convergence apparatus is set in 0.28 to 0.45 scope.
6. optical take-up apparatus as claimed in claim 1 is characterized in that, described convergence apparatus is made of independent lens.
7. optical take-up apparatus as claimed in claim 1 is characterized in that, described optics is formed by an independent shell that contains light radiating portion and light receiving part.
8. optical take-up apparatus as claimed in claim 1 is characterized in that, described optics forms by being arranged in same on-chip smooth radiating portion and light receiving part.
9. optical take-up apparatus as claimed in claim 1 is characterized in that the height of described optical take-up apparatus is equal to or less than 5mm.
10. optical recording and/or replay device comprise:
An optical take-up apparatus, it comprises:
An optics is formed by light radiating portion and light receiving part;
A convergence apparatus is used to assemble the light that the light radiating portion from described optics sends, and it is shone on the optical recording media;
A light path modifier is used to change emission light and by the light path of optical recording media reflected emitted light back light;
Wherein, described convergence apparatus is arranged between described optics and the described light path modifier, to record information on the optical recording media and/or playback information from the optical recording media.
11. optical recording as claimed in claim 10 and/or replay device is characterized in that, also comprise a drive unit, are used to drive described convergence apparatus, by driving this convergence apparatus and carry out focus control being arranged essentially parallel on the optical recording media direction.
12. optical recording as claimed in claim 11 and/or replay device is characterized in that, described drive unit also by be arranged essentially parallel to the optical recording media direction and perpendicular to the direction of focus control direction on drive described convergence apparatus and seek rail control.
13. optical recording as claimed in claim 10 and/or replay device, it is characterized in that, the focal length of setting convergence apparatus is F, its numerical aperture is NA, the substrate thickness of illuminated part is T, and its refractive index is n1, and its maximum amount of warpage is A, the refractive index of the part of the emission light path modifier that light and back light passed through is n2, then takes off the row relational expression:
F＞(2×A+T/n1)/(1-2×NA/n2)
14. optical recording as claimed in claim 13 and/or replay device is characterized in that, the numerical aperture NA of described convergence apparatus is set in 0.28 to 0.45 scope.
15. optical recording as claimed in claim 10 and/or replay device is characterized in that, described convergence apparatus is made of independent lens.
16. optical recording as claimed in claim 10 and/or replay device is characterized in that, described optics is formed by an independent shell that contains light radiating portion and light receiving part.
17. optical recording as claimed in claim 10 and/or replay device is characterized in that, described optics forms by being arranged in same on-chip smooth radiating portion and light receiving part.
18. optical recording as claimed in claim 10 and/or replay device is characterized in that, the height of described optical take-up apparatus is equal to or less than 5mm.
19. optical recording as claimed in claim 10 and/or replay device is characterized in that, from described optics send and the optical axis of light by described convergence apparatus perpendicular to the moving direction of described optical take-up apparatus.
20. an optical take-up apparatus comprises:
An optics is formed by light radiating portion and light receiving part;
A convergent lens is used to assemble the light that the light radiating portion from described optics sends, and it is shone on the optical recording media;
A drive unit is used to drive described convergence apparatus;
A light path modifier is used to change emission light and by the light path of optical recording media reflected emitted light back light;
Wherein, described convergent lens and drive unit are arranged between described optics and the described light path modifier, by driving this convergent lens and carry out focus control being arranged essentially parallel on the optical recording media direction, and by be arranged essentially parallel to the optical recording media direction and perpendicular to the direction of focus control direction on drive described convergent lens by described drive unit and seek rail control.
21. optical take-up apparatus as claimed in claim 20, it is characterized in that, the focal length of setting convergent lens is F, its numerical aperture is NA, the substrate thickness of illuminated part is T, and its refractive index is n1, and its maximum amount of warpage is A, the refractive index of the part of the emission light path modifier that light and back light passed through is n2, then takes off the row relational expression:
F＞(2×A+T/n1)/(1-2×NA/n2)
22. optical take-up apparatus as claimed in claim 21 is characterized in that, the numerical aperture NA of described convergent lens is set in 0.28 to 0.45 scope.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10235839A JP2000067461A (en) | 1998-08-21 | 1998-08-21 | Optical pickup device and optical recorder, optical reproducing device and optical recording/reproducing device using it |
| JP235839/1998 | 1998-08-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1245953A true CN1245953A (en) | 2000-03-01 |
Family
ID=16992040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99118153A Pending CN1245953A (en) | 1998-08-21 | 1999-08-21 | Optical pick-up device and optical recording and/or playback device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2000067461A (en) |
| KR (1) | KR20000017423A (en) |
| CN (1) | CN1245953A (en) |
-
1998
- 1998-08-21 JP JP10235839A patent/JP2000067461A/en active Pending
-
1999
- 1999-08-20 KR KR1019990034584A patent/KR20000017423A/en not_active Application Discontinuation
- 1999-08-21 CN CN99118153A patent/CN1245953A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| KR20000017423A (en) | 2000-03-25 |
| JP2000067461A (en) | 2000-03-03 |
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