CN100550145C - Photoscanner's actuator - Google Patents

Abstract

The present invention relates to a kind of actuator (2) that is used for the optical storage medium scanner, and utilize the device of on optical storage medium, reading and/or writing such as the actuator of this actuator.The present invention proposes a kind of actuator (2) that is used for optical scanner (1), it has the lens bracket (3) that is used for supporting object lens (7) and the printed coil (5,6) of focusing and tracking Control, six printed coils (5,6) are arranged on each of (3) two apparent surfaces of lens bracket and with associated magnet (4) and interact, and each magnet has 16 magnetic poles.

Description

Photoscanner's actuator

Technical field

The present invention relates to a kind of actuator of optical storage medium scanner, and utilize the device of on optical storage medium, reading and/or writing such as the actuator of this actuator.

Background technology

The actuator that is used for optical scanner utilizes winding around in conjunction with permanent magnet usually, so as to focus on be used for optical storage medium read and/or the light beam write to the Information Level of optical storage medium.In this case, actuator control focus is with respect to the tracking and the focusing of the data-track in the Information Level of optical storage medium.

Printed coil also is used for actuator, is used for replacing winding around.This printed coil is the P.e.c. that has the print copper track, and promptly copper track and magnet extend in parallel.Basically, this principle and winding around are worked in the same way.The advantage of printed coil comprises: the assembling process of actuator is simple, has saved winder, and second resonance of actuator reduces.Yet with regard to the number of turns of line thickness and winding, conventional coil changes bigger.With regard to printed coil, the usable area that is used for printing P.e.c. is limited, and the interval between the single track can not be less than a specified quantitative.Therefore the quantity of track is restricted.Therefore winding around allows to obtain bigger actuator sensitivity than printed coil.

Summary of the invention

An object of the present invention is to propose a kind of actuator that is used for optical scanner, this optical scanner utilizes printed coil simultaneously sensitiveer.

According to the present invention, this target is to realize by the actuator that is used for optical scanner, have and be used for supporting the lens bracket of object lens and be used for focusing on printed coil with tracking Control, six printed coils are arranged on each of two apparent surfaces of lens bracket and interact with relevant magnet, and each coil has 16 magnetic poles.

Specific magnetization makes the bigger zone that utilizes lens bracket that printed coil is set becomes possibility.Among two apparent surfaces of magnet and lens bracket each matches, and magnetization has 16 utmost points.In addition, also two or more magnet can be arranged in each casing, they correspondingly magnetize and combine.Utilize 16 magnetic poles and suitable magnet shape to allow six printed coils to be arranged on each of two surfaces of lens bracket.This causes comparing with existing actuator with printed coil, and sensitivity provides 20-30%.

Two printed coils that are used for four printed coils of focus control and are used for tracking Control are preferably in each of two surfaces of lens bracket.The electric current that focusing coil also can be selectively flows through coil by suitable selection is used for tilt function.

The pole span of magnet advantageously tilt to extend (run), is used for the position of printed coil of tracking Control in relevant setting at least and accomplishes.This allows 16 utmost points magnetization optimum, because the magnet that is used for focusing coil reduces the disturbing effect along the tracking coil of their location.It is as much as possible little that this makes that sensitivity reduces maintenance.

According to actuator of the present invention preferably be used in to optical storage medium read and/or the device write in.

Description of drawings

In order to help to understand, the present invention will describe referring to figs. 1 to 10 hereinafter.Reference numeral identical in each housing is represented components identical.In the drawings:

Fig. 1 has shown the scanner that is used for optical storage medium that utilizes the actuator according to the present invention;

Fig. 2 has shown the scanner that removes after the lid from Fig. 1;

Fig. 3 has shown the another one view of the optical scanner among Fig. 2;

Fig. 4 has shown the actuator that does not have magnet according to of the present invention;

Fig. 5 has shown the actuator that has magnet according to of the present invention;

Fig. 6 has shown the exploded view of the scanner that has magnet;

Fig. 7 has shown those parts of the printed coil relevant with tracking and focus control;

Fig. 8 has shown the synoptic diagram of relevant inclined pole pitch;

Fig. 9 has shown the synoptic diagram of magnetic pole; And

Figure 10 has shown the exploded view that has the actuator of magnet according to prior art.

Embodiment

Fig. 1 has shown the scanner 1 that is used for optical storage medium, and this scanner utilization actuator 2 according to the present invention focuses on and tracking Control by vertical and move horizontally object lens.In the drawings, actuator 2 is hidden by lid 8 parts.Optical scanner 1 shown in Figure 2 removes the situation behind the lid 8.As seen now, actuator 2 has a lens bracket 3 and is used for supporting object lens 7, and two magnet 4 that are used for focusing on tracking Control, this magnet be arranged on lens bracket 3 one sides and with relevant printed coil 5,6 interact (in Fig. 2, can not see).Fig. 3 has shown the view of the optical scanner 1 of different visual angles.To one skilled in the art, other elements of optical scanner 1 are known and no longer more explain in detail at this.

Fig. 4 has shown the lens bracket 3 that has printed coils 5,6, does not promptly have the actuator 2 of magnet 4.Printed coils 5,6 each comprise be used for focus control four printed coils 5 and be used for two printed coils 6 of tracking Control.Shown arrow is represented the electric current that flows through in the printed coil 5,6.If consider the magnetization of this scope internal magnet 4, with they in Fig. 5 and Fig. 6 by the form of being drawn performance, this magnetization causes actuator 2 to be moved according to the right-hand rule so.Can only see eight magnetic poles in each example in Fig. 5 and Fig. 6.Related opposite magnetic pole is arranged on the back side of magnet 4.Focusing coil 5 also can by suitable selection flow through coil current selective be used for tilt function.

Fig. 7 has shown the parts of actual relevant with tracking and focus control printed coil 5,6.Shaded portion has contribution to lens bracket 3 mobile.Other parts keep unused state.

Fig. 8 provides a kind of explanation of relevant inclined pole pitch.This inclined pole pitch is represented the magnetized optimization of 16 magnetic poles.The advantage that present embodiment is compared with straight pole pitch is to be used for the disturbing effect reduction of the magnet of focusing coil 5 to tracking coil 6, and this tracking coil 6 is on these focusing coil 5 next doors.To any desirable moving, need magnetized appropriate polarization.Do the time spent when relative magnetic pole this moment, cause sensitivity to reduce automatically.For straight pole pitch, dash area will have disturbing effect on the direction of arrow of tracking coil 6.This particular design by magnetic pole is avoided.If also consider the focusing coil 5 for as shown in Figure 7, have only the relevant fact in upper and lower, the pole span of Qing Xieing will can not make the sensitivity reduction that is used for focus control so.

For purpose of description, (Fig. 9 a), the form of planimetric map (Fig. 9 b) and skeleton view (Fig. 9 c) has shown the synoptic diagram of magnet 4 to Fig. 9 with front view.Adjacent pole with opposite polarization is emphasized by shade in this case.Shade does not illustrate that magnet 4 is made up of independent parts.

Actuator according to aforementioned techniques shows in Figure 10.Its use has the magnet 4 of 8 pole magnetization, and this magnet and two focusing coils 5 and two tracking coils 6 interact.Can find out easily that the zone that can be used for printed coils does not utilize fully.In addition, straight pole pitch causes the disturbing effect on the tracking coil 6.Generally speaking, this causes the sensitivity of actuator 2 to reduce.

Claims (4)

1. actuator (2) that is used for optical scanner (1), have the lens bracket (3) that is used for supporting object lens (7) and be used for focusing on printed coil (5 with tracking Control, 6), printed coil (5,6) being arranged on (3) two apparent surfaces of lens bracket upward and with two or more relevant magnet (4) interacts, it is characterized in that, two printed coils (6) that are used for four printed coils (5) of focus control and are used for tracking Control are arranged on each of two surfaces of lens bracket (3), and the magnet (4) that is arranged in each surface, two surfaces of lens bracket (3) has 16 magnetic poles.

2. actuator as claimed in claim 1 (2) wherein, is used for the printed coil (5) of focus control and also is used for the inclination control of lens bracket (3).

3. actuator as claimed in claim 1, wherein, each magnet (4) is made up of two or more parts, and the mutual viscosity of these parts connects.

4. one kind is used for the device reading and/or write on optical storage medium, it is characterized in that it comprises the optical scanner (1) that has as each described actuator (2) in the claim 1 to 3.

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