CN1963924A - Exciter and optical disc driver - Google Patents

Abstract

This invention relate to exciter and disc driver, which responds to light source wave length CD/DVD/BD disc and sets at least two light picker position tracing device and exciter for different wave, wherein, it sets more than one object lens and more than two exciters on the record media positions and the above lens is at the position of the inner circle of record media.

Description

Driver and CD drive

Technical field

The present invention is relevant in the disc drives apparatus, utilizes laser beam, the information translation of necessity is become optical signalling, and write down and the light picker structure of playback process and the technology of installation method thereof at CD.Especially about the technology of driver and CD drive, the present invention is for can be simultaneously corresponding to the CD/DVD/BD Disk that distinguishes according to optical source wavelength, and is provided with Position Tracking device---the driver of two above light pickers.

Background technology

Recently, fast development along with the Digital Media of Digital Media technology, high quality content miscellaneous (High Quality Contents) such as music, film, animation are gone up on the stage successively, and the recording medium of preservation foregoing (Contents) also becomes more rich and varied.

In addition, along with notebook computer (Notebook), Camcorder (camcorder), digital camera digital instruments such as (Digital Camera) progressively to the trend development of lightweight, miniaturization, information is preserved the miniaturization of medium and the requirement of high capacity also increases gradually.

At this, to above-mentioned carrier---the device that recorded information in the CD writes down with playback process is that light picks up driver.

Driver is according to permanent magnet field, with the operation of drive coil form, so that object lens are moved to the desired position.

At this moment, utilize the support fixed drive that has hardness and weaken characteristic, so that it possesses frequency characteristic.Driver is along orthogonal focusing and follow the tracks of both direction and go forward side by side and move, and for reducing the error of optical signalling, not have to rotate or the situation of unnecessary vibrations such as distortion under driven.

Usually, make the light beam spot (spot) of the light harvesting light beam of object lens, phenomenons such as cd side vibration due to rotating at CD and off-centre, objective lens device and the light picker of following the tracks of the CD signal trajectory together drive.

This objective lens device is called as light and picks up driver (Acatuator), and it makes object lens focus on (Focusing) and follows the tracks of (Tracking) operation, and as required, makes its light due to tilting and the motion of tangential direction.

The focusing action is meant and drives object lens up and down, so that the light beam spot of object lens (spot) enters in the depth of focus from the signal trajectory of CD; Drive object lens and follow the tracks of about action is meant, it makes the light beam spot of object lens follow the tracks of along the center of CD signal track.

Fig. 1 (a) and (b), (c) are schematic plan view and the front view (FV)s that conventional formula light picks up driver.

Conventional formula light picks up driver and utilizes coil and magnet, and by the electric current of inflow coil and the electromagnetic force between the magnet, drives object lens.

Fig. 1 (a) is the generalized schematic that relevant conventional formula formula light picks up driver.At this, conventional formula light picks up driver and is made up of following structure: promptly, object lens 101 are positioned at the centre, and are connected with the camera lens fixator (lens holder) 102 that focuses on and follow the tracks of usefulness coil 106,105 to outer peripheral face; Both sides along above-mentioned camera lens fixator 102 form magnet (magnet) 103 and the yoke (Yoke) 104 that field circuit is used; One end is that support lens fixator 102 is fixed on a plurality of upper and lower hoist cable (wire suspension) 107 on the upper and lower fixing machine plate 108 of above-mentioned camera lens fixator 102; Be located at a side of camera lens fixator 102, and be provided with the damper fixator 109 that the damper of hoist cable 107 other ends is used for support fixation.

Below with reference to accompanying drawings conventional formula light being picked up driver is elaborated.

Above-mentioned object lens 101 are located on the camera lens fixator 102, and the periphery of camera lens fixator 102 is twined and to be provided with the focusing coil 106 that focuses on usefulness, and for following the tracks of action, and at the tracking coil 105 of the suitable direction winding of each corner angle face.

In addition, the outstanding a plurality of yokes 104 of establishing by ferromagnetism body material in the left and right sides of above-mentioned camera lens fixator 102 are fixed above-mentioned magnet 103 respectively, and above-mentioned yoke 104 then links to each other with adapter pedestal (not shown) by fastening means.

The center, upper and lower side of above-mentioned camera lens fixator 102 is connected with fixing machine plate 108, on each fixing machine plate 108 again respectively aluminium be welded with two parallel hoist cable 107 1 ends, and the other end of above-mentioned hoist cable 107 is fixed on the motherboard by being located at the damper fixator 109 of camera lens fixator 102 1 sides.

At this, the inside of damper fixator 109 is connected with damper (not shown), possesses the characteristic of weakening so that have the hoist cable 107 of hardness, and the outside of above-mentioned damper fixator 109 links to each other with motherboard (not shown), and aluminium is welded with the other end of hoist cable 107.

The above-mentioned hoist cable 107 camera lens fixator 102 of can slinging, and play the middle boundary effect of supply of current.

The drive principle of above-mentioned driver is, the tracking coil 105 that is located on the camera lens fixator 102 twines along suitable direction, to its supply of current the time, will be along the formation magnetic field of appointment, and with fixing magnet 103 and electromagnetic force, generate reacting force and repulsion.

By above-mentioned reacting force and repulsion, camera lens fixator 102 will be moved along tracking direction (forward and backward), and drive the tracking servo device that the compensatory tracking error is used.

Above-mentioned focusing coil 106 is different from tracking coil 105, will be along the vertical direction winding around, when supply of current, will be along upper and lower to forming magnetic field, and the magnetic field and the electromagnetic field of effect and fixed magnet 103, apply power for tracking coil 105 along vertical direction.In addition, camera lens fixator 102 moves along focus direction (upper and lower), compensates the focus servo device of usefulness to drive for it.

Outer peripheral face at above-mentioned camera lens fixator 102 twines focusing and tracking coil 106,105, and with camera lens fixator 102, makes coil move mobile (moving) coil mode that is called as along focusing and tracking direction.In contrast, be provided with magnet, and be called as the moving magnet mode with the motion of camera lens fixator instrument moving magnet at camera lens holder circumference face.

At this moment, all adopted the Lorentz force of Fu Laiming lefft-hand rule by the move mode of magnet and coil.

To remark additionally to above-mentioned drive principle below.

Be provided with object lens in the above-mentioned driver, but this support factor of scioptics fixator (Lens Holder) moves, with the relative position between focusing objective len and the CD, and the track (Track) of tracking CD, so that the information that writes down on the CD is write down and playback process.

Above-mentioned driver will be with the drive coil gestalt movement of permanent magnet field, and object lens are moved to the desired position.

At this moment, utilize fixedly hardness and weaken characteristic of support in the driver, so that it possesses required frequency characteristic.At this, driver will be gone forward side by side along orthogonal focusing and tracking direction and be moved, and not reduce the error of optical signalling, under the situation that does not have unnecessary vibrations such as rotation or distortion, drive operation.

Above-mentioned camera lens fixator drives focusing coil (Focusing Coil) and the tracking coil (Tracking Coil) that driver is used by two or 4 wire springs supports and be provided with in the camera lens fixator.

For forming electromagnetic field, (Moving Part) is provided with yoke and permanent magnet on every side at driver.

The drive principle that light with said structure characteristics picks up driver is, behind the focusing coil in being located at magnetic field (Focus Coil) 106 supply of current, electromotive force will take place on the focusing coil 106, this electromotive force will make driver (Moving Part) move along above-below direction (optical axis direction, focus direction).

Utilize identical method, to tracking coil (Tracking Coil) 105 supply of current the time, driver (Moving Part) will move along left and right directions (tracking direction).

By above-mentioned drive principle, in the depth of focus of the laser beam (Laser Beam) that object lens (Object Lens) 101 penetrate, reflecting surface on the pit (pit) of the last tracer signal of CD (Disc) is focused on (Focus), and follows the tracks of the track (Track) on (Tracking) CD (Disc).

Fig. 1 (b) and (c) be the front view (FV) of 2 drivers of conventional formula and drive synoptic diagram.

In addition, along with the user tends to demand that superior high image quality moves Flame Image Process in continuous increase, the preservation capacity of preserving CD (Optical Disk) data is also increasing day by day.

At present, developed blue laser (Blue Laser) the level optical system (opticalsystem) of corresponding the demand, and, developed the pick-up that adopts special lens for to carry out optical design according to blue laser (Blue Laser) wavelength.

For CD (Compact disk) and the DVD (digitalvideo disk) that adopts conventional formula red laser (Red Laser) exchanged processing, need develop can be simultaneously corresponding to the object lens of all laser (Laser) wavelength, but, also be difficult to develop at present the object lens that can carry out Access simultaneously because of various technical elements remain in very big gap.

In view of the above, need develop and utilize a light picker magnetic head that comprises two optics, use the pick-up of red laser (Red laser) and blue laser system (Blue laser system) simultaneously.That is, can exchange the adapter of processing simultaneously to current CD, DVD, BD three kinds of medium such as (Blu-ray) of having been handled by normalization.

For carrying out Access simultaneously to above-mentioned a plurality of medium, in the routine techniques two object lens are located on the driver (Actuator), finish to exchange by 90 degree change actions and handle.

Fig. 2 (a) and (b) and Fig. 3 are for corresponding to conventional formula BD and CD/DVD2 wavelength, and constitute the synoptic diagram of 301,302 drivers of two camera lenses, comprise tracking coil 201, lens fixture 202, magnet 204, yoke 203, tracking coil 205 etc.As shown in Figure 3, the driver that is provided with two lens (Lens) 301,302 forms magnetic force in magnetic field space, to switch the object lens of 90 degree rotations.

Fig. 4 is the switching of relevant conventional formula object lens another embodiment synoptic diagram with driver.

As shown in the figure, object lens among the present invention switch two positions up and down that driver (Actuator) integral body are located at the Frame fixed position with driver (Actuator), and by transmitting propulsion system 408, make driver integral body carry out rectilinear motion along the trajectory direction of CD, to switch object lens (401,402).

The drive principle of other structure is in fact identical with content illustrated in fig. 1 among Fig. 4, so carry out simple explanation at this.

Blue Laser (BD) is supported by camera lens fixator 405 with object lens 402 with object lens 401 and Red Laser (CD/DVD), and above-mentioned camera lens fixator is then finished drive actions by driving with coil 406 and drive magnet 403.At this, above-mentioned drive magnet supports by driving yoke 404.

A side and opposite side at above-mentioned camera lens fixator are fixed with cable wire 409, and above-mentioned cable wire then is fixedly connected on the driver fixator 407.

In addition, above-mentioned driver fixator will be finished driving by Linear Driving engine 408.

Fig. 5 (a) and (b) are structural representations that encourage (Actuator) upward to the position of relevant recording medium CD.

At the origin position of CD, object lens 501,502 will move along the vertical direction of track, and for using two object lens 501,502 simultaneously),, and respectively the object lens position of CD/DVD and BD is located at optical axis central authorities along trajectory direction.

By conveyer of the present invention, driver (Actuator) integral body is sent to the position of CD trajectory direction, and switches with this, will be elaborated to its structure below.

That is to say that Fig. 5 a is that relevant driver fixator 507 moves to the left and right by Linear Driving engine 508, so that CD/DVD carries out the synoptic diagram of change action in optical axis central authorities with object lens.

Fig. 5 b is that relevant driver fixator 507 is moved to the left by Linear Driving engine 508, so that BD carries out the synoptic diagram of change action in optical axis central authorities with object lens.

Fig. 6 is the short transverse at driver (Actuator), the synoptic diagram of the position change action of viewing objective.

The object lens that are positioned at optical axis center at first will be according to the variation of system, by driver (Actuator) conveyer, switches along the trajectory direction of CD, and by the position change action, the object lens that are fit to current system is set at optical axis center.

In view of the above, can switch two object lens along suitable direction, and can move CD/DVD Red laser optics and BD blue laser (Blue laser) are all exchanged a pick-up system of processing.

Below with reference to accompanying drawings 4 and accompanying drawing 5, the content of Fig. 6 is carried out simple declaration.

Fig. 6 (a) is the synoptic diagram from top view Fig. 5 (a) state.

The light of the light source that penetrates from light source will incide on the BD usefulness object lens 601 by catoptron 609.For this reason, Linear Driving engine 607 will mobile to the right driver fixator 608.At this,, identical with the explanation in Fig. 1 and Fig. 4 about the content of other magnet 603 and yoke 604.

Shown in Fig. 6 (b), the light of the light source that penetrates from light source will incide on the CD/DVD usefulness object lens 602 by catoptron 609.For this reason, Linear Driving engine 607 will be moved to the left driver fixator 608.

Fig. 7 is relevant structure and the driving action synoptic diagram that conventional formula light picks up the CD drive of driver that be provided with.

As shown in the figure, conventional formula light picks up driver and is made up of following structure: promptly, be provided with the camera lens fixator of object lens; Drive coil and magnet that the camera lens fixator is used; The support fitting that the support lens fixator is used; Be provided with the fixed support accessory and pick up driver 153 with the light of the carried out pitch drives of fixed port; The more than one spindle guide that connects on the boxlike pedestal 150 that is located at optical recording and playing device draws fixator 152; Spindle guide lead device 151 by spindle guide lead device anchor support; Connection is located at the light that slides along the spindle guide lead device and picks up on the boxlike pedestal of driver 153 and optical recording/playing device, to drive the engine 154 of optical recording media (CD) 155 usefulness.

In addition, comprise that optical devices 156 connections of accessories such as PD, LD are located on the boxlike pedestal 150 of optical recording/playing device, and be separated from each other with above-mentioned pick-up driver.

The lower end of above-mentioned light picker 153 is provided with the light of reflective optics input, and reflected light is sent to the catoptron that object lens are used.

Fig. 8 is relevant structure and the driving action floor map that conventional formula light picks up the CD drive of driver that be provided with.

Just the light picker among the present invention (Pick-up) is installed in and carries out CD track (Disk Track) and follow the tracks of on light picker (Pick-up) conveyer of required slip (Slide) motion the driving mechanism (Mechanism) of the mini drive that comes into operation (Micro drive).

As mentioned above, utilizing blue laser diode and having driven the object lens of detaining number, improve in the BD light picker (Pick-up) of recording density, nervous at present exploitation is simultaneously corresponding to the technology that has CD/DVD CD (Disk) now.

But in BD system (System), for all CD and DVD beyond the BD are carried out playback process, according to optical technology analysis up to now, aspect the utilization ratio of light and optical property and enough operating distances (Working Distance) guarantee, use two object lens to be optimal selection.

That is to say, follow the tracks of and to drive CD/DVD simultaneously with camera lens and BD camera lens for carrying out CD.For this reason, in routine techniques, two object lens are located on driver (Actuator) driver along directions of rays or tangential direction.

But when in above-mentioned driver (Actuator), needing to carry out 3 drivings, because the center (Center) of turning axle and object lens is inconsistent, therefore can't compensate the inclination (Tilt) of light (Radial) direction, and be to make the initial installation inclination (Tilt) of two camera lenses identical, and need when the fixed bonding camera lens, adjust (Tilt), aspect function and making, there are a lot of restrictions.

Summary of the invention

The objective of the invention is in order to solve above-mentioned prior art problems, provide a kind of to the distortion of following the tracks of CD or the driver that track position is followed the tracks of and compensated, by the present invention, can constitute each object lens according to purpose and purposes, and by plural driver, make it corresponding to object lens, optionally to constitute 2 or 3 axial brake devices.

In the present invention, also, be fixed on the pick-up pedestal by adjusting the posture (position) of each driver, thus its equipment (Mounting) stability of characteristics, and when cemented objective, need not to adjust.

Driver of the present invention and CD drive are made up of following structure: the camera lens fixator that is provided with above object lens; Drive coil and magnet that described camera lens fixator is used; Support the support fitting that described camera lens fixator is used; Be provided with fixing described support fitting driver fixator.To achieve these goals, be provided with plural object lens and in driver among the present invention and the CD drive corresponding to the plural driver (Actuator) of above-mentioned object lens, so that CD/DVD/BD Disk all can be corresponding according to the wavelength of light source.

In one embodiment of the invention, above-mentioned plural driver is by crossover, parallel or be located at relatively in the space on the plane.

In one embodiment of the invention, the object lens that are located on above-mentioned two above drivers should be positioned on the most all positions of cd-rom recording surface.

In one embodiment of the invention, for shortening two distances between the above object lens, the position that is located at the object lens on the driver can be moved to the center line side of driver.

Effect of the present invention:

As mentioned above, the present invention is come into operation after can exchanging processing to conventional formula CD/DVD level information storage apparatus in the BD level high capacity optical information save set that uses blue laser of future generation (Blue laser).

By the present invention, be divided into 2 and 3, only, optionally constitute 2 or 3 axial brake devices to the camera lens of necessity.

In addition, the present invention also can be by adjusting the driver posture, fixing pick-up pedestal, thus its equipment (Mounting) stability of characteristics, and when bonding object lens, need not to adjust.

The present invention only is provided with object lens in each driver (Actuator), so can effectively improve its drive characteristic.

For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.

Description of drawings

Fig. 1 (a) and (b), (c) are schematic plan view and the front view (FV)s that conventional formula light picks up driver;

Fig. 2 (a) and (b) and Fig. 3 are for corresponding to conventional formula BD and CD/DVD2 wavelength, and constitute the driver synoptic diagram of two camera lenses;

Fig. 4 is the switching of relevant conventional formula object lens another embodiment synoptic diagram with driver;

Fig. 5 (a) and (b) are vertical switching floor map of a plurality of object lens;

Fig. 6 (a) and (b) are vertical switching front schematic view of a plurality of object lens;

Fig. 7 is relevant structure and the driving action synoptic diagram that conventional formula light picks up the CD drive of driver that be provided with;

Fig. 8 is relevant structure and the driving action floor map that conventional formula light picks up the CD drive of driver that be provided with;

Fig. 9 is the synoptic diagram that constitutes two above drivers among relevant the present invention;

Figure 10 be relevant in the present invention, plural driver is located at synoptic diagram on the CD drive;

Figure 11 be relevant in the present invention, plural driver is located at synoptic diagram on the CD drive;

Figure 12 is relevant in another embodiment of the present invention, for dwindling two distances between the object lens, and the position of object lens is moved to the synoptic diagram of driver center line side.

Embodiment

Embodiment to driver of the present invention and CD drive is elaborated below with reference to accompanying drawings.

Fig. 9 is the synoptic diagram that constitutes two above drivers among relevant the present invention.

As shown in the figure, be provided with plural object lens 701,702 and be provided with the plural driver (Actuator) 703,704 of above object lens when operating corresponding to each wavelength, above-mentioned driver 703,704 is with crossover or be arranged in parallel.

Figure 10 be relevant in the present invention, plural driver is located at synoptic diagram on the CD drive.

As shown in the figure, be provided with plural object lens 701,702 when operating and be provided with two above drivers 703,704 of above object lens, and plural object lens all are positioned on the most all positions of cd-rom recording surface corresponding to each wavelength.

In embodiment, be provided with plural camera lens protruding type driver (Actuator) relatively, so that two drivers crossover on plane space forms with said structure characteristics.

As shown in the figure, make two object lens approach engine shaft (Spindle Motor), therefore two object lens all can be positioned on the most all positions of cd-rom recording surface.

Figure 11 be relevant in the present invention, plural driver is located at synoptic diagram on the CD drive.

As Fig. 9, Figure 10 and shown in Figure 11, according to employed optical source wavelength, in plural object lens 701,702, select and drive any one object lens, drive the driver that is located on the object lens with this.

As mentioned above, the present invention is about utilizing laser beam, the information translation that the disc drives apparatus is required becomes optical signalling, and in CD writes down light picker structure and equipment (Mounting) with playback process, for can be according to the wavelength of each light source, simultaneously corresponding to the CD/DVD/BD CD, and the plural driver of Position Tracking device overlapping or that be arranged in parallel and drive two above object lens and drive the light picker of object lens, so that object lens are positioned at the week locational driver and the technology of CD drive of recording medium CD.

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.

In addition, also can carry out suitable distortion to the foregoing description among the present invention uses.As shown in figure 12, for shortening two, the position to the object lens object lens can be moved to driver center line side to the distance between the object lens object lens.

Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.

Claims (6)

1, a kind of driver and CD drive are made up of following structure: the camera lens fixator that is provided with above object lens; Drive coil and magnet that described camera lens fixator is used; Support the support fitting that described camera lens fixator is used; Be provided with fixing described support fitting driver fixator, it is characterized in that:

In described driver and the CD drive, be wavelength, the plural driver that is provided with the above object lens should be located on the recording medium relatively corresponding to a plurality of light sources.

2, driver as claimed in claim 1 and CD drive is characterized in that:

Each object lens by plural described driver constitutes are positioned on the most all positions of recording medium face.

3, driver as claimed in claim 2 and CD drive is characterized in that:

The definite part of each described driver is overlapped in the space on the plane.

4, as claim item 3 described driver and CD drive, it is characterized in that:

The definite part of described each described driver is overlapped in the space on the plane, should be oppositely arranged to be overlapped in above-mentioned plane space.

5, as claim item 2 described driver and CD drive, it is characterized in that:

Each described driver should be able to be arranged in parallel.

6, driver as claimed in claim 1 and CD drive is characterized in that:

More than one described object lens also should be able to be not symmetrical with corresponding described driver center line.

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