CN1728250A - optical read/write head - Google Patents
optical read/write head Download PDFInfo
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- CN1728250A CN1728250A CN 200410071036 CN200410071036A CN1728250A CN 1728250 A CN1728250 A CN 1728250A CN 200410071036 CN200410071036 CN 200410071036 CN 200410071036 A CN200410071036 A CN 200410071036A CN 1728250 A CN1728250 A CN 1728250A
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- laser beam
- write head
- bearing seat
- load bearing
- light path
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- 230000003287 optical effect Effects 0.000 title claims abstract description 93
- 239000004020 conductor Substances 0.000 claims description 13
- 238000013016 damping Methods 0.000 claims description 13
- 238000005452 bending Methods 0.000 claims description 9
- 238000003860 storage Methods 0.000 claims description 8
- 238000013500 data storage Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
An optical read / write head consists of two sets of light path systems as each system including laser beam generating unit, light guiding unit, focusing objective lens for receiving laser beam and focusing it on data surface of optical recording media, light detector for receiving reflected laser beam with optical data signal. It features that light path of laser beam led by each light guiding unit in two sets of light path systems is presented in cross to each other form.
Description
Technical field
The present invention relates to a kind of optical read/write head, particularly relate to a kind of optical read/write head of double light path.
Background technology
Adopt the technology of the data of optical read-write head accessing optical record medium, be widely known by the people already, and along with the storage volume of optical record medium and the raising of storage density, the structure of optical read/write head is evolution constantly also, one evolution feature is exactly that the wavelength of the laser beam of access optical record medium shortens gradually, and numerical aperture of objective (Numerical Aperture, NA) uprise gradually that (promptly the optically focused focus in order to the laser beam of access optical record medium diminishes, and its size is proportional to laser beam wavelength, and be inversely proportional to numerical aperture of objective), to meet the ever-increasing optical record medium of storage volume and storage density.
The design of new-type optical read/write head must possess downward compatibility, just can either the new-type optical record medium of access, also can the old-fashioned optical record medium of access, so new-type optical read/write head must have the read-write mechanism of using different laser beam wavelengths, based on this, developed and multiple optical record medium that can two kinds of different data storage density of access, as can be used to writable disc (Compact Disk, CD) and digital versatile disc (Digital Versatile Disk, optical read/write head DVD).
As the disclosed bifocus focusing objective len that produces different numerical aperture of objective in No. 5446565 patent case of the U.S., its laser beam that is produced at the laser beam generation unit marches to full image optical assembly (Holographic Opticai Element, H.O.E.) time, this full image optical assembly can make its laser beam of passing through form diffraction and focus on optical record medium by focusing objective len, and characteristic by the formed two kinds of diffraction angles of this full image optical assembly, the focusing objective len of arranging in pairs or groups again can make laser beam focus on different focus (data surface of the optical record medium of different data storage density), with the optical record medium of two kinds of different data storage density of access, but the cost of manufacture height of special full image optical assembly.
If with cost consideration, using two light sources and two kinds of object lens can be comparatively economic selection, and as No. 00255233 patent of Korean Patent, wherein disclosed technology is used two different wavelength of laser light sources, mate different lens respectively, and the luminous point that reads of different focal and different-diameter is provided.This optical read/write head makes the laser beam of two laser beam different wavelength that generation unit produces respectively by its optical path, and the arrival focusing objective len, and according to the corresponding different numerical aperture of objective value of the laser beam of different wavelength, and form the optically focused focus of different size, after the optical record medium reflection, be back to photodetector separately, realize the purpose of the optical record medium of two kinds of different data storage density of access, yet double beam system tends to make overall volume comparatively huge, does not meet present demand for 3C Product.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of optical read/write head, carries out data access with the optical record medium to two kinds of different data storage density respectively, and proposes special optical path design, and the shared overall volume of read/write head is reduced.
To achieve these goals, the invention provides a kind of optical read/write head, be used for reading and writing the optical record medium of two kinds of different pieces of information storage densities, its characteristics are, include: two groups of light path systems, respectively include: a laser beam generation unit, in order to produce a laser beam, the wavelength of the described laser beam of two groups of described light path systems is different; One light element is disposed on the light path of described laser beam generation unit, and described light element guides the described laser beam of described laser beam generation unit to advance; One focusing objective len receives described laser beam from described light element, makes described laser beam by described focusing objective len and focus on the data surface of described optical record medium; An and photodetector, in order to be received from the described laser beam of described optical recording media reflection, described laser beam is after described optical record medium reflection, carry the light data-signal that described data surface writes down, described laser beam is returned described light element again, and guides to described photodetector by described light element; Wherein, described two groups of light path systems present the setting that crosses one another by the light path of the described laser beam of separately described light element guiding.
Above-mentioned optical read/write head, its characteristics are that the intersecting angle of described two groups of light path systems is 30 to 150 degree.
Above-mentioned optical read/write head, its characteristics are that described laser beam generation unit comprises a laser diode and a diffraction grating, and described laser diode sends described laser beam, and diffraction grating then is divided into described laser beam the described laser beam that reads and follow rail.
Above-mentioned optical read/write head, its characteristics are, described light element comprises a spectroscope, one collimating mirror and a refrative mirror, described spectroscope reflects the described laser beam that described laser beam generation unit is produced earlier, make described laser beam become directional light through described collimating mirror, change the directional light direction to described focusing objective len by described refrative mirror again, make described laser beam by described focusing objective len and focus on the described data surface of described optical record medium, and reflect described laser beam through described data surface and return described light element, transmit described laser beam to described photodetector.
Above-mentioned optical read/write head, its characteristics are, also comprise concavees lens, are arranged on the light path before described laser beam enters described photodetector.
The present invention also provides a kind of optical read/write head, be used for reading and writing the optical record medium of two kinds of different pieces of information storage densities, its characteristics are, comprise: two groups of light path systems, guide two laser beam to focus on the data surface of described optical record medium by two focusing objective lens, the light path of two laser beam presents the setting that crosses one another; One actuator, in order to install two groups of described light path systems, it includes: an object lens load bearing seat, described focusing objective len is arranged at the end face of described object lens load bearing seat; One group of focusing coil is arranged on the described object lens load bearing seat, and making its induced field direction is a focus direction of described focusing objective len; One group is followed the path circle, is arranged on the described object lens load bearing seat, makes its induced field direction perpendicular to described focus direction, to follow the rail direction as one; One magnetic circuit device, in order to produce a magnetic field, the direction in described magnetic field is parallel to the described induced field direction of following the path circle, and described magnetic direction is perpendicular to the induced field direction of described focusing coil, and described magnetic circuit device also makes described focusing coil and the described path circle that follows is subjected to described the action of a magnetic field; And a plurality of plain conductors, in order to supporting described object lens load bearing seat, and make described object lens load bearing seat and describedly follow the start of rail direction along described focus direction; One loam cake exceeds range of movement in order to prevent described actuator movable part, and avoids movable part to be subjected to external impacts.
Above-mentioned optical read/write head, its characteristics are that the intersecting angle of described two groups of light path systems is 30 to 150 degree.
Above-mentioned optical read/write head, its characteristics are, the side of described object lens load bearing seat has a plurality of first prodgers and a plurality of second prodger, on described first prodger conical mouths is arranged respectively, each described conical mouths can provide a described plain conductor to pass, and described second prodger then contacts with described focusing coil or the described end that follows the path circle.
Above-mentioned optical read/write head, its characteristics are, described magnetic circuit device is made up of a yoke and more than one magnet, described yoke contain more than one side wall and with a inside wall corresponding to described side wall, described magnet is adsorbed in described side wall to produce described magnetic field, and described inside wall is then in order to be fixed in described yoke with the object lens load bearing seat.
Above-mentioned optical read/write head, its characteristics are that a bending member is extended toward described magnet direction in the both sides of described side wall, and the bending angle of described bending member can be 10 degree to 120 degree and distributes with the magnetic line of force of guiding described magnetic field.
Above-mentioned optical read/write head, its characteristics are that the bottom of described yoke has the outstanding of circular arc type.
Above-mentioned optical read/write head, its characteristics are, also comprise a damping load bearing seat, and described damping load bearing seat is installed in described yoke with a screw, and making described damping load bearing seat is that central shaft rotates with respect to described yoke with described screw, to adjust the angle of inclination.
Above-mentioned optical read/write head, its characteristics are, also comprise a circuit board, and described circuit board is engaged in the surface of described damping load bearing seat, and described plain conductor conducting is in described circuit board.
Effect of the present invention is can be respectively the optical record medium of two kinds of different data storage density to be carried out data access, and proposes special optical path design, and the shared overall volume of read/write head is reduced.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is the synoptic diagram of the embodiment of the invention; And
Fig. 2 is the actuator synoptic diagram of the embodiment of the invention.
Wherein, Reference numeral:
110-first light path system, 111-laser diode, 112-diffraction grating
120-second light path system, 121-spectroscope, 122-collimating mirror
The 123-refrative mirror, the 124-focusing objective len
The 130-photodetector, the 131-concavees lens
200-object lens load bearing seat, 201-focusing objective len, 202-focusing objective len
203-second prodger, 204-first prodger
The 210-yoke, 211-side wall, 212-bending member
The 213-inside wall, the 214-screw
220-magnet, 230-follow the path circle
The 240-focusing coil, the 241-plain conductor
250-damping load bearing seat, 260-circuit board, 270-loam cake
Embodiment
The optical read/write head of the disclosed multi-wavelength of the present invention, carry out data access in order to optical record medium to different data storage density, as shown in Figure 1, it is the synoptic diagram of the embodiment of the invention, include first light path system 110 and second light path system 120, the light path of the light path of first light path system 110 and second light path system 120 presents the setting that crosses one another, and so can dwindle the volume of whole read/write head configuration effectively.
First light path system 110 and second light path system 120 are made up of laser beam generation unit, light element, focusing objective len (not shown) and photodetector 130 respectively.The laser beam generation unit comprises laser diode 111 and diffraction grating 112, and laser diode 111 is in order to send the laser beam of linear polarization, and 112 of diffraction gratings form the laser beam that is produced and read and follow the laser beam of rail.
Light element is disposed on the light path of laser beam generation unit, laser beam in order to guided laser bundle generation unit is advanced, make laser beam by focusing objective len and focus on the data surface of optical record medium, laser beam is the reflected back light element again, and guide to photodetector 130 along the optical routing light element and receive, the light data-signal is converted to corresponding electric signal.As shown in Figure 1, light element includes: spectroscope (Beam-splitter) 121, collimating mirror (Collimatior) 122 and refrative mirror (foldingmirror) 123.As shown in Figure 1, the laser beam that spectroscope 121 first reflection lasering beam generation units are produced, make laser beam become 122 to be directional light through collimating mirror, change the directional light direction to focusing objective len 124 by refrative mirror 123 again, make laser beam by focusing objective len 124 and focus on the data surface of optical record medium, the laser beam that focuses on is returned refrative mirror 123, collimating mirror 122 and spectroscope 111 along light path again after the optical record medium reflection, received by photodetector 130 at last.And the embodiment of the invention also comprises concavees lens 131, is arranged on the light path before laser beam enters photodetector 130, in order to revise the light signal quality of disc reflection.So, can utilize first light path system 110 and second light path system 120 to read the optical record medium of different pieces of information density respectively, the intersecting angle of two groups of light path systems is about 30 to 150 degree can make full use of overall space.
Optical record medium is write the process of data, the incoming laser beam wherein and the optical path of the reflection lasering beam still optical path with above-mentioned execution data read are identical, difference then is that the process that writes is to utilize the function generator of more vairable that the driving circuit of laser beam generation unit is applied modulation, its laser light produce power that produces is changed, causing the physical change of the material of optical record medium by photo-thermal effect, according to the energy of LASER Light Source and the hole, hole of causing the data of representative " 0 " or " 1 " on the data storing surface of optical record medium.And in order to make smoothly reading of data of optical read/write head, need make optical read-write head actuator possess parallel focus characteristics, will focus on by the laser light of optical R/W pickup lens and can make focus correct maintain the disc data recording layer; And the parallel rail characteristic of following, focus is remained on the data track central authorities of the recording layer of data storage medium.
The present invention also comprises a kind of optical read/write head, it comprises in order to install the actuator of two groups of light path systems of the present invention, please refer to Fig. 2, it is the actuator synoptic diagram of the embodiment of the invention, and it comprises: object lens load bearing seat 200, focusing coil 240, follow magnetic circuit device that path circle 230, yoke 210 and magnet 220 formed, four plain conductors 241, damping load bearing seat 250 and circuit boards 260.The focusing objective len 201,202 of two groups of light path systems is arranged at the end face of object lens load bearing seat 200 respectively, object lens load bearing seat 200 has two openings with installing focusing objective len 201,202, and the side of object lens load bearing seat 200 has a plurality of first prodgers 204 and second prodger 203, on first prodger 204 conical mouths is arranged respectively, each conical mouths can provide a plain conductor 241 to pass, 203 of second prodgers and focusing coil 240 or the end that follows path circle 230 contact, conveniently to carry out the welding of each coil and plain conductor 241.Make plain conductor 241 be supported object lens load bearing seat 200, and allow object lens load bearing seat 200 and follow the start of rail direction along focus direction.And focusing coil 240 is arranged on the object lens load bearing seat 200, and to make its induced field direction be the focus direction of focusing objective len 201,202; Follow path circle 230 and be arranged on the object lens load bearing seat 200, and make its induced field direction, with as following the rail direction perpendicular to focus direction.
Magnetic circuit device is in order to producing magnetic field, and the parallel induced field direction of following the path circle of the direction in magnetic field, and perpendicular to the induced field direction of focusing coil.In an embodiment, as shown in Figure 2, magnetic circuit device is made up of yoke 210 and the magnet 220 that invests on the yoke 210, yoke 210 contain more than one side wall 211 and with inside wall 213 corresponding to side wall 211, magnet 220 is adsorbed in side wall 211, the end of magnet 220, side wall 211, inside wall 213 and yoke 210, be clipped in 211 and 213 the above-mentioned field circuit of the common generation of part, the bending member 212 toward the magnet direction is extended in the both sides of side wall 211, and its bending angle can be 10 degree to the magnetic line of force of 120 degree with guide field and distributes.The bottom of yoke 210 has the outstanding of circular arc type, with the usefulness of inclination angle adjustment that when assembling is provided.Damping load bearing seat 250 is installed in yoke 210 with screw 214, and making damping load bearing seat 250 is that central shaft is with respect to yoke 210 rotations, the angle of inclination when assembling optical system with the adjustment actuator with screw 214.And circuit board 260 is engaged in the surface of damping load bearing seat 250, and 241 conductings of plain conductor are in circuit board 260, to provide plain conductor 241 external electric connection.270 of loam cakes are in order to the protection movable part, avoid external impacts, also can avoid movable part up to exceed movable range.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of claim of the present invention.
Claims (13)
1, a kind of optical read/write head is used for reading and writing the optical record medium of two kinds of different pieces of information storage densities, it is characterized in that, includes:
Two groups of light path systems respectively include:
One laser beam generation unit, in order to produce a laser beam, the wavelength of the described laser beam of two groups of described light path systems is different;
One light element is disposed on the light path of described laser beam generation unit, and described light element guides the described laser beam of described laser beam generation unit to advance;
One focusing objective len receives described laser beam from described light element, makes described laser beam by described focusing objective len and focus on the data surface of described optical record medium; And
One photodetector, in order to be received from the described laser beam of described optical recording media reflection, described laser beam is after described optical record medium reflection, carry the light data-signal that described data surface writes down, described laser beam is returned described light element again, and guides to described photodetector by described light element;
Wherein, described two groups of light path systems present the setting that crosses one another by the light path of the described laser beam of separately described light element guiding.
2, optical read/write head according to claim 1 is characterized in that, the intersecting angle of described two groups of light path systems is 30 to 150 degree.
3, optical read/write head according to claim 1, it is characterized in that, described laser beam generation unit comprises a laser diode and a diffraction grating, and described laser diode sends described laser beam, and diffraction grating then is divided into described laser beam the described laser beam that reads and follow rail.
4, optical read/write head according to claim 1, it is characterized in that, described light element comprises a spectroscope, one collimating mirror and a refrative mirror, described spectroscope reflects the described laser beam that described laser beam generation unit is produced earlier, make described laser beam become directional light through described collimating mirror, change the directional light direction to described focusing objective len by described refrative mirror again, make described laser beam by described focusing objective len and focus on the described data surface of described optical record medium, and reflect described laser beam through described data surface and return described light element, transmit described laser beam to described photodetector.
5, optical read/write head according to claim 1 is characterized in that, also comprises concavees lens, is arranged on the light path before described laser beam enters described photodetector.
6, a kind of optical read/write head is used for reading and writing the optical record medium of two kinds of different pieces of information storage densities, it is characterized in that, comprises:
Two groups of light path systems guide two laser beam to focus on the data surface of described optical record medium by two focusing objective lens, and the light path of two laser beam presents the setting that crosses one another;
One actuator, in order to install two groups of described light path systems, it includes:
One object lens load bearing seat, described focusing objective len is arranged at the end face of described object lens load bearing seat;
One group of focusing coil is arranged on the described object lens load bearing seat, and making its induced field direction is a focus direction of described focusing objective len;
One group is followed the path circle, is arranged on the described object lens load bearing seat, makes its induced field direction perpendicular to described focus direction, to follow the rail direction as one;
One magnetic circuit device, in order to produce a magnetic field, the direction in described magnetic field is parallel to the described induced field direction of following the path circle, and described magnetic direction is perpendicular to the induced field direction of described focusing coil, and described magnetic circuit device also makes described focusing coil and the described path circle that follows is subjected to described the action of a magnetic field; And
A plurality of plain conductors in order to supporting described object lens load bearing seat, and make described object lens load bearing seat and describedly follow the start of rail direction along described focus direction.
One loam cake exceeds range of movement in order to prevent described actuator movable part, and avoids movable part to be subjected to external impacts.
7, optical read/write head according to claim 6 is characterized in that, the intersecting angle of described two groups of light path systems is that 30 degree are to 150 degree.
8, optical read/write head according to claim 6, it is characterized in that, the side of described object lens load bearing seat has a plurality of first prodgers and a plurality of second prodger, on described first prodger conical mouths is arranged respectively, each described conical mouths can provide a described plain conductor to pass, and described second prodger then contacts with described focusing coil or the described end that follows the path circle.
9, optical read/write head according to claim 6, it is characterized in that, described magnetic circuit device is made up of a yoke and more than one magnet, described yoke contain more than one side wall and with a inside wall corresponding to described side wall, described magnet is adsorbed in described side wall to produce described magnetic field, and described inside wall is then in order to be fixed in described yoke with the object lens load bearing seat.
10, optical read/write head according to claim 9 is characterized in that, a bending member is extended toward described magnet direction in the both sides of described side wall, and the bending angle of described bending member can be 10 degree to 120 degree and distributes with the magnetic line of force of guiding described magnetic field.
11, optical read/write head according to claim 9 is characterized in that, the bottom of described yoke has the outstanding of circular arc type.
12, optical read/write head according to claim 9, it is characterized in that also comprise a damping load bearing seat, described damping load bearing seat is installed in described yoke with a screw, making described damping load bearing seat is that central shaft rotates with respect to described yoke with described screw, to adjust the angle of inclination.
13, optical read/write head according to claim 9 is characterized in that, also comprises a circuit board, and described circuit board is engaged in the surface of described damping load bearing seat, and described plain conductor conducting is in described circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100710365A CN100361213C (en) | 2004-07-27 | 2004-07-27 | optical read/write head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100710365A CN100361213C (en) | 2004-07-27 | 2004-07-27 | optical read/write head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1728250A true CN1728250A (en) | 2006-02-01 |
| CN100361213C CN100361213C (en) | 2008-01-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100710365A Expired - Fee Related CN100361213C (en) | 2004-07-27 | 2004-07-27 | optical read/write head |
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| Country | Link |
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| CN (1) | CN100361213C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102043242B (en) * | 2009-10-26 | 2012-07-11 | 致伸科技股份有限公司 | Laser scanning reader |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2532818B2 (en) * | 1993-02-01 | 1996-09-11 | 松下電器産業株式会社 | Objective lens and optical head device |
| JP4006904B2 (en) * | 1999-09-29 | 2007-11-14 | ソニー株式会社 | Optical head, light detection element, optical information recording / reproducing apparatus, and focus error detection method |
-
2004
- 2004-07-27 CN CNB2004100710365A patent/CN100361213C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102043242B (en) * | 2009-10-26 | 2012-07-11 | 致伸科技股份有限公司 | Laser scanning reader |
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| Publication number | Publication date |
|---|---|
| CN100361213C (en) | 2008-01-09 |
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