CN100385530C - Optical pickup and optical disk device - Google Patents

Optical pickup and optical disk device Download PDF

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Publication number
CN100385530C
CN100385530C CNB200580000531XA CN200580000531A CN100385530C CN 100385530 C CN100385530 C CN 100385530C CN B200580000531X A CNB200580000531X A CN B200580000531XA CN 200580000531 A CN200580000531 A CN 200580000531A CN 100385530 C CN100385530 C CN 100385530C
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CN
China
Prior art keywords
described
lens mount
coil
pair
direction
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CNB200580000531XA
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Chinese (zh)
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CN1806283A (en
Inventor
宫木隆浩
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索尼株式会社
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Priority to JP145482/2004 priority Critical
Priority to JP2004145482 priority
Priority to JP311892/2004 priority
Application filed by 索尼株式会社 filed Critical 索尼株式会社
Publication of CN1806283A publication Critical patent/CN1806283A/en
Application granted granted Critical
Publication of CN100385530C publication Critical patent/CN100385530C/en

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Abstract

The present invention is directed to an optical pick-up adapted for moving an object lens ( 7 ) supported by a lens holder ( 2 ) in a focus direction in parallel to the optical axis direction thereof and in a tracking direction perpendicular to the focus direction, and for performing control of tilt angle serving to tilt the optical axis of the object lens following inclination of an optical disc. At the lens holder, there are provided a pair of focus coils ( 20 ) and a pair of tracking coils ( 30 ). The pair of focus coils have coil surfaces which are perpendicular to winding axes of coil portions constituting the respective focus coils and face magnets, and are so attached to the lens holder as to face the tangential direction with the object lens put therebetween, the pair of focus coils being shifted in left and right directions respectively away from a virtual axis which is perpendicular to the tracking direction and passes along the optical axis of the object lens, the coil surfaces being directed toward the tangential direction. By changing a drive force produced at the pair of focus coil portions, tilt angle of the object lens is controlled.

Description

Optical pick-up and optical disc apparatus

Technical field

The present invention relates to be used for information signal recording at CD, will be recorded in optical pick-up (the light ピ of the information signal regenerating on the CD StarNetwork ア Star プ) and adopt the optical disc apparatus of this optical pick-up.

The application is serve as the application that the requirement right of priority is come on the basis in Japan in the Japanese patent application No. 2004-145482 of on May 14th, 2004 application and in Japanese patent application 2004-311892 number of application on October 27th, 2004, and these applications have been quoted in reference among the application.

Background technology

In the prior art, adopt the CD of pocket dish (CD:CompactDisc), DVD (Digital Versatile Disc) etc. as the recording medium of information signal, for information signal recording on these CDs or will be recorded in the information signal regenerating on the CD and use optical pick-up.

Such optical pick-up has two actuators, these two actuators, for the light beam that penetrates from light source is focused on the record surface of CD, making object lens is to move on the focus direction at its optical axis direction, simultaneously, in order to make pencil tracing be located at track record on the CD, make object lens with the in-plane of its light shaft positive cross in tracking direction move.

In recent years, along with the high record densityization of CD, the shape that requires to be formed on the luminous point on the cd-rom recording surface forms more circular, object lens is controlled to be to make its optical axis be very important perpendicular to cd-rom recording surface.For this reason, proposed to have the optical pick-up of three actuators in the prior art, these three actuators focus on and follow the tracks of and have also on the basis of two actuators of usefulness that the optical axis that makes object lens is followed the tracks of the inclination of CD and the specific actuator of the pitch angle control usefulness that tilts.

This has the optical pick-up of three actuators, owing to need the specific actuator of pitch angle control usefulness, so component number increases, and is unfavorable for miniaturization, also needs to be used to drive the drive signal of specific actuator, so be unfavorable for saving consumption electric power.

On the other hand, another kind of optical pick-up has also been proposed in the prior art, the intensity of the supporting device of this optical pick-up by making the supporting lens mount, the characteristic imbalance of machinery, and lens mount is tilted with the displacement of the focus direction of lens mount, make tilt angle varied.This optical pick-up is put down in writing in TOHKEMY 2001-319353 communique.

This optical pick-up, owing to must be suppressed at the useless inclination (skew) that makes the lens mount that lens mount produces when focus direction and tracking direction move, so, the assembling of the supporting mechanical part of lens mount and these mechanical parts precision of all having relatively high expectations is unfavorable for cutting down component costs and assembly cost.

Summary of the invention

The objective of the invention is to solve the existing problem of above-mentioned optical pick-up of the prior art, and then provide a kind of and help realizing miniaturization and save consuming electric power, helping the optical disc apparatus that reduces the optical pick-up of component costs and assembly cost and adopt this optical pick-up.

Optical pick-up of the present invention has lens mount, rest pad, supporting arm, a pair of focusing coil, magnet and a pair of tracking coil; Described lens mount is used to support at least one object lens; Described rest pad, with the tangential direction of the focus direction quadrature of the optical axis direction that is parallel to described object lens, with described lens mount devices spaced apart setting; Described supporting arm connects described lens mount and described rest pad, can make described lens mount support described lens mount with respect to described rest pad movably at described focus direction and the tracking direction that is orthogonal to described tangential direction; Described a pair of focusing coil is located on the described lens mount, by supplying with drive current described lens mount is moved in described focus direction; Described magnet is bearing on the yoke, respectively with described a pair of focusing coil in opposite directions; Described a pair of tracking coil is installed on the described lens mount opposite to each other with described magnet, by supplying with drive current described lens mount is moved at described tracking direction; Described a pair of focusing coil have with the coiling axis quadrature of each focusing coil and with described magnet coil surface in opposite directions, across described object lens in described tangential direction position toward each other, with perpendicular to described tracking direction and be parallel to tangential direction and the imaginary axis of optical axis by described object lens is staggered positions ground to the left and right, center, with described coil surface towards described tangential direction be installed on the described lens mount, described a pair of tracking coil have with the coiling axis quadrature of each tracking coil and with described magnet coil surface in opposite directions, across described object lens ground in described tangential direction position toward each other, with perpendicular to described tracking direction and be parallel to tangential direction and the imaginary axis of optical axis by described object lens is staggered positions ground to the left and right, center, with described focusing coil side by side, with described coil surface towards described tangential direction be installed on the described lens mount, in addition, described supporting arm is made of side's supporting arm and the opposing party's supporting arm, this side supporting arm and the opposing party's supporting arm are configured in perpendicular to described tracking direction and are parallel to tangential direction and the both sides of the imaginary axis of optical axis by described object lens, described side's supporting arm and the opposing party's supporting arm respectively have a pair of, are configured in side by side on the optical axis direction of described object lens; First imaginary axis on the end face of the lens mount that disposes focusing coil and tracking coil is side by side coupling together the lower support arm of the optical axis direction lower side that is positioned at described object lens among the connecting portion of the upper support arm of the optical axis direction upper side that is positioned at described object lens among described a pair of side's supporting arm and described lens mount and the described a pair of the opposing party's supporting arm and the connecting portion of described lens mount; Second imaginary axis on the end face of the lens mount that disposes focusing coil and tracking coil is side by side coupling together the upper support arm of the optical axis direction upper side that is positioned at described object lens among the connecting portion of the lower support arm of the optical axis direction lower side that is positioned at described object lens among described a pair of side's supporting arm and described lens mount and the described a pair of the opposing party's supporting arm and the connecting portion of described lens mount; The intersection point that connects this first imaginary axis and second imaginary axis be formed on by drive current that supplies to described each tracking coil and the identical height in driving center that driving force acted on that produces from the effect of the magnetic flux of described magnet, simultaneously, constitute the height identical with the center of gravity of the described lens mount that comprises described object lens, described focusing coil and described tracking coil, and, the driving center of focusing coil is with respect to the position of the center of gravity of lens mount, along the optical axis direction skew of object lens.

Optical disc apparatus of the present invention has driving mechanism and optical pick-up; Described driving mechanism keeps CD and drives its rotation; Described optical pick-up carries out the record of information signal or the light beam of regeneration to the CD irradiation of being rotated by described drive mechanism, simultaneously, detects the folded light beam from described CD reflection; It is characterized in that described optical pick-up has lens mount, rest pad, supporting arm, a pair of focusing coil, magnet and a pair of tracking coil; Described lens mount is used to support at least one object lens; Described rest pad, with the tangential direction of the focus direction quadrature of the optical axis direction that is parallel to described object lens, with described lens mount devices spaced apart setting; Described supporting arm connects described lens mount and described rest pad, can make described lens mount support described lens mount with respect to described rest pad movably at described focus direction and the tracking direction that is orthogonal to described tangential direction; Described a pair of focusing coil is located on the described lens mount, by supplying with drive current described lens mount is moved in described focus direction; Described magnet is bearing on the yoke, respectively with described a pair of focusing coil in opposite directions; Described a pair of tracking coil is installed on the described lens mount opposite to each other with described magnet, by supplying with drive current described lens mount is moved at described tracking direction; Described a pair of focusing coil have with the coiling axis quadrature of each focusing coil and with described magnet coil surface in opposite directions, across described object lens in described tangential direction position toward each other, with perpendicular to described tracking direction and be parallel to tangential direction and the imaginary axis of optical axis by described object lens is staggered positions ground to the left and right, center, with described coil surface towards described tangential direction be installed on the described lens mount, described a pair of tracking coil have with the coiling axis quadrature of each tracking coil and with described magnet coil surface in opposite directions, across described object lens in described tangential direction position toward each other, with perpendicular to described tracking direction and be parallel to tangential direction and the imaginary axis of optical axis by described object lens is staggered positions ground to the left and right, center, with described focusing coil side by side, with described coil surface towards described tangential direction be installed on the described lens mount, in addition, described supporting arm is made of side's supporting arm and the opposing party's supporting arm, this side supporting arm and the opposing party's supporting arm are configured in perpendicular to described tracking direction and are parallel to tangential direction and the both sides of the imaginary axis of optical axis by described object lens, described side's supporting arm and the opposing party's supporting arm respectively have a pair of, are configured in side by side on the optical axis direction of described object lens; First imaginary axis on the end face of the lens mount that disposes focusing coil and tracking coil is side by side coupling together the lower support arm of the optical axis direction lower side that is positioned at described object lens among the connecting portion of the upper support arm of the optical axis direction upper side that is positioned at described object lens among described a pair of side's supporting arm and described lens mount and the described a pair of the opposing party's supporting arm and the connecting portion of described lens mount; Second imaginary axis on the end face of the lens mount that disposes focusing coil and tracking coil is side by side coupling together the upper support arm of the optical axis direction upper side that is positioned at described object lens among the connecting portion of the lower support arm of the optical axis direction lower side that is positioned at described object lens among described a pair of side's supporting arm and described lens mount and the described a pair of the opposing party's supporting arm and the connecting portion of described lens mount; The intersection point that connects this first imaginary axis and second imaginary axis be formed on by drive current that supplies to described each tracking coil and the identical height in driving center that driving force acted on that produces from the effect of the magnetic flux of described magnet, simultaneously, constitute the height identical with the center of gravity of the described lens mount that comprises described object lens, described focusing coil and described tracking coil, and, the driving center of focusing coil is with respect to the position of the center of gravity of lens mount, along the optical axis direction skew of object lens.

Be suitable for optical pick-up of the present invention, have lens mount, rest pad, supporting arm, a pair of focusing coil and magnet;

Described lens mount is used to support object lens;

Described rest pad, with the tangential direction of the focus direction quadrature of the optical axis direction that is parallel to described object lens, with described lens mount devices spaced apart setting;

Described supporting arm connects described lens mount and described rest pad, can make described lens mount support described lens mount with respect to described rest pad movably at described focus direction and the tracking direction that is orthogonal to described tangential direction;

Described a pair of focusing coil is located on the described lens mount, by supplying with drive current described lens mount is moved in described focus direction;

Described magnet is bearing on the yoke, respectively with described a pair of focusing coil in opposite directions;

Described a pair of focusing coil have with the coiling axis quadrature of each focusing coil and with described magnet coil surface in opposite directions, across described object lens in described tangential direction position toward each other, with the imaginary axis perpendicular to described tracking direction and the optical axis by described object lens is staggered positions ground to the left and right, center, with described coil surface towards described tangential direction be installed on the described lens mount.

Optical pick-up of the present invention also has a pair of tracking coil, and this a pair of tracking coil and described magnet are installed on the described lens mount opposite to each other, by supplying with drive current described lens mount is moved at described tracking direction;

Described a pair of tracking coil have with the coiling axis quadrature of each tracking coil and with described magnet coil surface in opposite directions, across described object lens in described tangential direction position toward each other, with the imaginary axis perpendicular to described tracking direction and the optical axis by described object lens is staggered positions ground to the left and right, center, with described focusing coil side by side, with described coil surface towards described tangential direction be installed on the described lens mount.

In being suitable for optical pick-up of the present invention, with the focusing coil of the one side side in opposite directions that is installed in lens mount abreast and tracking coil in opposite directions magnet and with the focusing coil and the tracking coil magnet in opposite directions of the side on the other hand in opposite directions that is installed in lens mount abreast, the magnet by integral body constitutes respectively.

Described each magnet is magnetized in this wise: one side with the described focusing coil that forms rectangle in the relative both sides of described objective lens optical axis direction face in opposite directions and become magnetic pole inequality with another side face in opposite directions; Simultaneously, one side with the described tracking coil that forms rectangle in the relative both sides of described tracking direction face in opposite directions and become magnetic pole inequality with another side face in opposite directions.

In addition, optical disc apparatus of the present invention has driving mechanism and optical pick-up;

Described driving mechanism keeps CD and drives its rotation;

Described optical pick-up carries out the record of information signal or the light beam of regeneration to the CD irradiation of being rotated by described drive mechanism, simultaneously, detects the folded light beam from described CD reflection; It is characterized in that,

Described optical pick-up has lens mount, rest pad, supporting arm, a pair of focusing coil and magnet;

Described lens mount is used to support object lens;

Described rest pad, with the tangential direction of the focus direction quadrature of the optical axis direction that is parallel to described object lens, with described lens mount devices spaced apart setting;

Described supporting arm connects described lens mount and described rest pad, can make described lens mount support described lens mount with respect to described rest pad movably at described focus direction and the tracking direction that is orthogonal to described tangential direction;

Described a pair of focusing coil is located on the described lens mount, by supplying with drive current described lens mount is moved in described focus direction;

Described magnet is bearing on the yoke, respectively with described a pair of focusing coil in opposite directions;

Described a pair of focusing coil have with the coiling axis quadrature of each focusing coil and with described magnet coil surface in opposite directions, across described object lens ground in described tangential direction position toward each other, with the imaginary axis perpendicular to described tracking direction and the optical axis by described object lens is staggered positions ground to the left and right, center, with described coil surface towards described tangential direction be installed on the described lens mount.

Be suitable for optical pick-up of the present invention and optical disc apparatus, the a pair of focusing coil that it is disposing in tangential direction in opposite directions across object lens, being staggered positions ground to the left and right, center perpendicular to tracking direction and the imaginary axis by objective lens optical axis, with coil surface towards tangential direction be installed on the lens mount, so, supply to the size of the drive current of a pair of focusing coil by adjusting, make the power that acts on the focus direction on each focusing coil produce difference, lens mount is moved towards the direction of tilt angle varied.

Therefore, optical pick-up of the present invention and optical disc apparatus be not owing to need to control the specific actuator that the pitch angle is used, so can reduce part count, realize miniaturization, in addition, because do not need to supply with drive current to the specific actuator of pitch angle control usefulness, so, consumption electric power can be saved.

In addition, optical pick-up of the present invention and optical disc apparatus, owing to do not adopt the intensity or the unbalanced formation of mechanical property that make the supporting device used of supporting lens mount, so, make lens mount when focus direction and tracking direction move, be difficult to produce useless inclination at lens mount, so the mechanism components of supporting lens mount and the assembling of these mechanism components are not required high precision, can save component costs and assembly cost.

Other purpose of the present invention and the concrete advantage that obtains by the present invention, from following with reference to being well understood to more the embodiment of description of drawings.

Description of drawings

Fig. 1 is that expression is organized into the calcspar of optical disc apparatus first embodiment of optical pick-up of the present invention.

Fig. 2 is the stereographic map of expression optical pick-up first embodiment of the present invention.

Fig. 3 is the vertical view of optical pick-up shown in Figure 2.

Fig. 4 is the stereographic map that expression is located at the configuration formation of the focusing coil in the optical pick-up of the present invention.

Fig. 5 is that expression is located at the stereographic map that the configuration of focusing coil in the optical pick-up of the present invention and tracking coil constitutes.

Fig. 6 is the stereographic map that expression constitutes the configuration relation of the focusing coil of optical pick-up of the present invention and tracking coil and magnet.

Fig. 7 is focusing coil and the configuration of the tracking coil front elevation that constitute of expression in optical pick-up second embodiment of the present invention.

Fig. 8 is the stereographic map of expression optical pick-up the 3rd embodiment of the present invention.

Fig. 9 is the vertical view of optical pick-up shown in Figure 8.

Embodiment

Elder generation illustrates optical pick-up of the present invention and adopts first embodiment of the optical disc apparatus of this optical pick-up.

Be suitable for of the present invention group of CD of going into optical pick-up, have formation as shown in Figure 1.

As shown in Figure 1, be suitable for optical disc apparatus 101 of the present invention, have Spindle Motor 103, optical pick-up 104 and feeding motor 105.Spindle Motor 103 drives the driving mechanism as the CD 102 of optical recording media such as CD-R, DVD ± R, DVD-RAM as being used for rotation.Feeding motor 105 is as the driving mechanism that is used to optical pick-up 104 is moved on its radial direction.Here, Spindle Motor 103 is by system controller 107 and 109 controls of servocontrol portion, so that drive with predetermined rotation number.

Modulating and demodulating signal portion and ECC piece 108 carry out additional from modulation, demodulation and the ECC (error correction symbol) of the signal of signal processing part 120 output.Optical pick-up 104 is according to the instruction from system controller 107 and servocontrol portion 109, to the signal recording surface illumination beam of the CD 102 of rotation.By such light beam irradiates, CD 102 is carried out the record of information signal and being recorded in information signal regenerating on the CD.

In addition, optical pick-up 104, the folded light beam according to the signal recording surface from CD 102 reflects detects the such various light beams of aftermentioned, and the detection signal that obtains from each light beam is supplied to signal processing part 120.

Signal processing part 120, according to detecting the detection signal that each light beam obtains, generate various servo be focus error signal, tracking error signal with signal, and to generate the information signal that is recorded on the CD be the RF signal.In addition, according to the kind of recording medium,, carry out based on predetermined processing such as the demodulation of these signals and error correction processing by servocontrol portion 109, signal modulation and ECC piece 108 etc. as the regeneration object.

Here, the tracer signal by signal modulation and 108 demodulation of ECC piece for example if the data storage of computing machine is used, then passes out to outer computer 130 etc. by interface 111.Like this, outer computer 130 grades can receive the signal that is recorded on the CD 102 as regenerated signal.

In addition, the tracer signal by signal modulation and 108 demodulation of ECC piece if acoustic image is used, then after the D/A transformation component of D/A, A/D transducer 112 carries out the digital-to-analog conversion, supplies to acoustic image handling part 113.Then, carry out the audio image signal Processing, send outside shooting, projection machine to by audio-visual signal input and output portion 114 at this acoustic image handling part 113.

On optical pick-up 104, connecting feeding motor 105.By the rotation of feeding motor 105, optical pick-up 104 radially is fed operation CD 102, moves to the predetermined recording track on the CD 102 always.The control of the control of Spindle Motor 103, feeding motor 105 and the control of actuator are undertaken by servocontrol portion 109 respectively.The object lens that above-mentioned actuator makes optical pick-up 104 are towards the focus direction of its optical axis direction and be orthogonal to the tracking direction moving displacement of optical axis direction.

That is, servocontrol portion 109 carries out the control of Spindle Motor 103, and, carry out the control of actuator according to focus error signal and tracking error signal.

In addition, servocontrol portion 109, according to the focus error signal of importing from signal processing part 120, tracking error signal, RF signal etc., generate the drive signal (drive current) that is used to supply with a pair of focusing coil 20,20 (see figure 2)s of aftermentioned and a pair of tracking coil 30,30 (see figure 2)s respectively.

In addition, card for laser control unit 121 is used for controlling the LASER Light Source of optical pick-up 104.

In addition, focus direction F described here is meant the optical axis direction of object lens 7 (see figure 2)s of optical pick-up 104.Tangential direction Tz described here is meant the direction with focus direction F quadrature, is the parallel direction of tangential direction with the circumference of CD 102.Tracking direction T described here, be meant direction with focus direction F and tangential direction Tz quadrature, in addition, the optical axis and the imaginary line angulation that extends by this optical axis of object lens 7 are spent the difference angle that departs from respect to 90 on the radial direction of CD 102, be called pitch angle radially.

Below, describe optical pick-up 104 in detail.

Fig. 2 is the stereographic map that expression is suitable for optical pick-up first embodiment of the present invention.Fig. 3 is its vertical view.Fig. 4 is that expression is located at the stereographic map that the focusing coil configuration in the optical pick-up shown in Figure 2 constitutes.Fig. 5 is that focusing coil and the tracking coil that expression is located in the optical pick-up of the present invention disposes the stereographic map that constitutes.Fig. 6 is the stereographic map that expression constitutes the configuration relation of the focusing coil of optical pick-up of the present invention and tracking coil and magnet.

Be suitable for optical pick-up 104 of the present invention, have semiconductor laser, photodiode and optical system.Semiconductor laser is as the light source of outgoing beam.Photodiode is as the photodetector of detection from the folded light beam of the signal recording surface reflection of CD 102.The beam direction CD 102 that optical system penetrates semiconductor laser, and with folded light beam direct light detecting element.

As shown in Figure 2, optical pick-up 104 is located on the substrate 60, and this substrate 60 can move at the radial direction of CD 102 in the framework of optical disc apparatus 100.

Optical pick-up 104 has lens mount 2 and rest pad 3.Lens mount 2 is supporting object lens 7, and these object lens 7 are shining on the CD 102 behind the beam condenser of light source ejaculation.Rest pad 3 is installed on the substrate 60, at the tangential direction interval certain apart from lens mount 2.Object lens 7 constitute the part of the optical system of optical pick-up 104.

As Fig. 2, shown in Figure 3, lens mount 2 surrounds the outer peripheral face side of object lens 7, and portion is keeping object lens 7 in the central.

In the both sides of the tracking direction of lens mount 2, respectively be provided with a pair of arm support 8 on focus direction devices spaced apart ground respectively.

As Fig. 2, shown in Figure 3, rest pad 3 has along the length of tracking direction with along the height of focus direction.

In both sides along the rest pad 3 of tracking direction, respectively the focus direction devices spaced apart be provided with a pair of arm support 14.

Each a pair of arm support 14 of the both sides of the tracking direction of a pair of arm support 8 of each of the both sides of the tracking direction of lens mount 2 and rest pad 3, each a pair of supporting arm 80 by a side and the opposing party is connecting respectively.

As shown in Figure 2, each supporting arm 80 of a side and the opposing party, the focus direction devices spaced apart be arranged in parallel, can make lens mount 2 support lens mount 2 movably at focus direction F and tracking direction T with respect to rest pad 3.

These each supporting arms 80 are by having electric conductivity and the rubber-like thread-like member constitutes.The end of rest pad 3 sides in each supporting arm 80, though it is not shown but in fact be connected with servocontrol portion 109 by distribution component, focus on accordingly with focus error signal and to use drive current, supply to each focusing coil 20,20 from servocontrol portion 109 by these supporting arms 80, with tracking signal corresponding driving electric current, supply to each tracking coil 30,30 by these supporting arms 80 from servocontrol portion 109.

And, on lens mount 2, be provided with a pair of focusing coil 20,20 and a pair of tracking coil 30,30.When drive current was fed into a pair of focusing coil 20,20, this a pair of focusing coil 20,20 made lens mount 2 move in focus direction.When drive current was fed into a pair of tracking coil 30,30, this a pair of tracking coil 30,30 made lens mount 2 move at tracking direction.

In the present embodiment, focusing coil 20,20 and tracking coil 30,30 are made of the coil of formed flattened rectangular shapes such as printed coil.In addition, the number of turn and the physical dimension of each focusing coil 20,20 are identical, and the number of turn and the physical dimension of each tracking coil 30,30 are identical.

As shown in Figure 3, a pair of focusing coil 20,20 has respectively and the coil surface 24 of axis 22 quadratures of reeling.This a pair of focusing coil 20,20 is the center with the imaginary axis L of the optical axis center by object lens 7, and left and right symmetrically is installed on the side face of lens mount 2.

In the present embodiment, each focusing coil 20,20 disposes in this wise: its coiling axis 22 extends abreast with tangential direction Tz, and its coil surface 24 is positioned on the face with the tangential direction quadrature.

In addition, as shown in Figure 3, a pair of tracking coil 30,30 has the coil surface 34 with coiling axis 32 quadratures of coil portion respectively.As Fig. 3 and shown in Figure 5, a pair of tracking coil 30,30, be provided with abreast with each focusing coil 20,20, across object lens 7 in tangential direction position toward each other, with the imaginary axis L perpendicular to tracking direction T and the optical axis center by object lens 7 is staggered positions ground to the left and right, center, is installed on the side face of lens mount 2.

In the present embodiment, each tracking coil 30,30 disposes in this wise: its coiling axis 32 extends abreast with tangential direction Tz, and its coil surface 34 is positioned on the face with the tangential direction quadrature.

Like this, in the present embodiment, focusing coil 20 and tracking coil 30 respectively dispose a pair of across the mode of object lens 7 on a side's of tangential direction Tz lens mount 2 side faces toward each other face and the opposing party's face to be arranged side by side constituting.Be installed in the one side of lens mount 2 and focusing coil 20 and the tracking coil 30 gone up on the other hand respectively, tracking direction T separate certain intervals ground also row arrangement.

A pair of focusing coil 20 that is disposing across object lens 7 and a pair of tracking coil 30 that is disposing across object lens 7 equally are electrically connected with the end of lens mount 2 sides of four supporting arms 80.The drive current of two bursts of focusing usefulness supplies to respectively on a pair of focusing coil 20 independently by supporting arm 80, and one drive current of following the tracks of usefulness is jointly supplied on a pair of tracking coil 30 by supporting arm 80.

And, as shown in Figure 2, between lens mount 2 and substrate 60, focus direction F devices spaced apart disposing yoke 18.As shown in Figure 2, yoke 18 is installed on the substrate 60.As shown in Figure 4, be provided with peristome 1802 in the substantial middle portion of this yoke 18, this peristome 1802 infeeds the light beam that is mapped to object lens 7 to be passed through.

As shown in Figures 2 and 3,, erect opposite to each other across object lens 7 and to form a pair of yoke iron slice 18a, 18a, on the face in opposite directions of each yoke iron slice 18a, 18a, magnet 19,19 is installed in the both sides of the tangential direction Tz of yoke 18.

In addition, as shown in Figure 6, each magnet 19 forms rectangle, is installed on each yoke iron slice 18a, 18a, and its long limit is parallel with tracking direction T, and its minor face is parallel with focus direction F.

Here each magnet 19,19 of Cai Yonging forms as the integrated magnets with some different magnetized areas.Each magnet 19,19 is magnetized in this wise: in the time of on being installed in each yoke iron slice 18a, 18a, have as shown in Figure 6 magnetized area with lens mount 2 face side in opposite directions.

Here, each magnet 19,19 is magnetized in this wise: will polarize on focus direction F with coil surface 24 zone in opposite directions of focusing coil 20.That is, each magnet 19,19 is magnetized in this wise: will with each limit part in opposite directions that is parallel to tracking direction T of the focusing coil 20 that forms rectangle, form different magnetized areas respectively.Here, on each magnet 19,19, be provided with first magnetized portion 1902 and sulfureted second magnetized portion 1904 that is magnetized.In first magnetized portion 1902, become the N utmost point with the zone in opposite directions, limit of Fig. 6 lower side that is arranged in focusing coil 20.In second magnetized portion 1904, become the S utmost point with the limit part in opposite directions of Fig. 6 upper side that is arranged in focusing coil 20.

In addition, each magnet 19,19 is magnetized in this wise: will polarize at tracking direction T with coil surface 34 zone in opposite directions of tracking coil 30.That is, each magnet 19,19 is magnetized in this wise: will with each limit part in opposite directions that is parallel to focus direction F of the tracking coil 30 that forms rectangle, form different magnetized areas respectively.Here, on each magnet 19,19, be provided with the 3rd magnetized portion 1906 that is magnetized.In the 3rd magnetized portion 1906, become the N utmost point with the zone in opposite directions, limit of Fig. 6 left side that is arranged in tracking coil 30.In addition, becoming the S polar region with the limit part in opposite directions of the right-hand side of Fig. 6 that is arranged in tracking coil 30 is magnetized.A part that makes the S utmost point and focusing coil 20 second magnetized portion 1904 in opposite directions with become zone that the S polar region is magnetized in opposite directions.Therefore, second magnetized portion 1904 is geomagnetic into the L font, that is, with the limit from the right-hand side of Fig. 6 that is arranged in tracking coil 30, the zone in opposite directions, limit of right-hand side becomes the S utmost point in Fig. 6 of tracking coil 30.

In addition, as shown in Figure 3, in the present embodiment, the pole surface of two magnet 19 is identical respectively with the interval G1 of the coil surface 24 of two focusing coils 20, and the pole surface of two magnet 19 is identical respectively with the interval G2 of the coil surface 34 of two tracking coils 30.

Below, the action of above-mentioned optical pick-up 104 is described.

The situation that explanation earlier makes lens mount 2 move at focus direction and tracking direction.

When the drive current of setting two bursts of identical focusing usefulness of current value for when servocontrol portion 109 supplies to a pair of focusing coil 20,20 respectively, produced the power of focus direction by the mutual magnetic action in magnetic field of first magnetized portion 1902 of the magnetic field that produces in a pair of focusing coil 20,20 and each magnet 19 and second magnetized portion 1904, this masterpiece is used on the lens mount 2, opposing will be withdrawn into lens mount 2 recuperability of focus direction neutral position by supporting arm 80, like this, lens mount 2 moves in focus direction.

At this moment, be identical owing to supply to the current value of drive current of two bursts of focusing usefulness of a pair of focusing coil 20,20 respectively, so, as Fig. 4, shown in Figure 5, act on two power F of the focus direction on a pair of focusing coil 20,20 respectively 1, F 2There is not difference, that is, and to two power F of two partial actions of the lens mount 2 that is provided with each focusing coil 20,20 1, F 2Not there are differences.Therefore, it is the power of the direction of center rotation that lens mount 2 is not subjected to imaginary axis L, and the pitch angle does not change, and above-mentioned imaginary axis L extends in tangential direction by the optical axis of object lens 7.

In addition, when the tracking drive current that is made as the common current value, supplied to a pair of tracking coil at 30,30 o'clock from servocontrol portion 109, produced the power of tracking direction by the mutual magnetic action in the magnetic field of second magnetized portion 1904 of the magnetic field that produces in the tracking coil 30,30 and each magnet 19 and the 3rd magnetized portion 1906, this masterpiece is used on the lens mount 2, opposing will be withdrawn into lens mount 2 recuperability of tracking direction neutral position by supporting arm 80, and like this, lens mount 2 moves at tracking direction.

In addition, do not supply under the state of focusing coil 20,20 at the drive current that focuses on usefulness, lens mount 2 is remained on the neutral position of focus direction by supporting arm 80, in addition, do not supply under the state of tracking coil 30 at the drive current of following the tracks of usefulness, lens mount 2 is remained on the neutral position of tracking direction by supporting arm 80.

Below, the situation that lens mount 2 is moved towards the direction of above-mentioned tilt angle varied is described.

When the drive current of two bursts of different focusing usefulness of current value when servocontrol portion 109 supplies to a pair of focusing coil 20,20 respectively, produced the power of focus direction by the mutual magnetic action in the magnetic field of first magnetized portion 1902 of the magnetic field that produces in a pair of focusing coil 20,20 and each magnet 19 and second magnetized portion 1904, this masterpiece is used on the lens mount 2, opposing will be withdrawn into lens mount 2 recuperability of focus direction neutral position by supporting arm 30, like this, lens mount 2 moves in focus direction.

At this moment, because it is inequality to supply to the current value of drive current of focusing usefulness of each focusing coil 20,20 respectively, so, as Fig. 4, shown in Figure 5, act on two power F of the focus direction on each focusing coil 20 respectively 1, F 2Produce difference, that is, and to two power F of two partial actions of the lens mount 2 that is provided with each focusing coil 20,20 1, F 2Produce difference.As a result, it is the power of the direction of center rotation that lens mount 2 is subjected to imaginary axis L, and the pitch angle changes.The variable quantity at pitch angle is by two power F that act on the focus direction on a pair of focusing coil 20,20 respectively 1, F 2Difference decision, in other words, by the difference decision of the focusing that supplies to a pair of focusing coil 20,20 respectively with the current value of drive current.

For example, monitor from the deviate of the RF signal of signal processing part 120 inputs, will be controlled to be the size that deviate reduces with drive current from the focusing that servocontrol portion 109 supplies to each focusing coil 20,20 by servocontrol portion 109.

The optical pick-up 104 of present embodiment, since across object lens 7 in tangential direction position in opposite directions, mutually tracking direction T staggered positions be installed on the side face of lens mount 2, so, can supply to the size of the drive current of each focusing coil 20,20 by adjusting, make the power that acts on the focus direction on each focusing coil 20,20 produce difference, lens mount 2 is moved towards the direction of tilt angle varied.

Therefore, do not need to make the specific actuator of lens mount 2 towards the pitch angle control usefulness that the direction that makes tilt angle varied moves, can cut down the actuator of pitch angle control usefulness and the parts relevant with this actuator, can realize miniaturization, in addition, because do not need to be used to supply with the drive current of specific actuator, so, consumption electric power can be saved.

In addition, uneven and with the focus direction position (amount of movement) of lens mount 2 lens mount 2 is tilted and then make in the formation of tilt angle varied in the intensity of supporting device by making supporting lens mount 2 or mechanical property, owing to the intensity of supporting device or the reason of mechanical property, make lens mount 2 when focus direction and tracking direction move, produce unnecessary inclination (skew) at lens mount 2 easily, in order to suppress this inclination, the assembling of the supporting mechanism components of lens mount 2 and these mechanism components precision of all having relatively high expectations, then need not among the present invention can reduce component costs and assembly cost like that.

In addition, in the present embodiment, because focusing coil 20,20 is made of pancake coil, its coil surface 24 is towards the pole surface of magnet 19, so the roughly whole zone of focusing coil 20 intersects with first magnetized portion 1902 of magnet 19 and the magnetic field of second magnetized portion 1904, like this, focusing coil 20,20 miniaturizations can be made, the power of focus direction can be produced effectively with less drive current.

In addition, in the optical pick-up 104 of the present invention, the focus direction position (amount of movement) that also can become with lens mount 2 correspondingly makes lens mount 2 tilt, and makes the formation of tilt angle varied.

For example, as shown in Figure 3, among two magnet 19,19, if the pole surface of side's magnet 19 and face the G1 that is spaced apart between the coil surface 24 of side's focusing coil 20 of pole surface of this side magnet 19, if the pole surface of the opposing party's magnet 19 and face the G2 that is spaced apart between the coil surface 24 of the opposing party's focusing coil 20 of pole surface of this opposing party's magnet 19 makes G1 and G2 inequality.

To be assembled at least one governor motion that can tangentially support slidably in yoke 18 on the substrate 60 and the rest pad 3 by being provided with, and can easily carry out the setting of G1, G2 at interval, this governor motion can be suitable for existing known various mechanisms.

Like this, when the interval G1 between each focusing coil 20,20 and the magnet 19,19, when G2 is set at different value, the density in the magnetic field that produces between side's focusing coil 20 and the side's magnet 19, with between the magnetic density of generation between the opposing party's focusing coil 20 and the opposing party's magnet 19, produce difference, act on the power F of a pair of focus direction on each face in opposite directions of lens mount 2 1, F 2Become uneven.

In such formation, if handle arrives a pair of focusing coil 20,20 with focus error signal corresponding driving current supply, lens mount 2 is tilted, make tilt angle varied.

At this moment, if supply to a pair of focusing coil 20 respectively, the big or small identical words of 20 drive current, then can correspondingly make tilt angle varied with the focus direction position (amount of movement) of lens mount 2, but, as previously mentioned, if measurement result according to the deviate of RF signal, the drive current of different sizes is supplied to each focusing coil 20 respectively, 20 words, then the focus direction position (amount of movement) with lens mount 2 correspondingly makes tilt angle varied, simultaneously, supply to the size of the drive current of each focusing coil 20 by control, can more critically regulate the pitch angle, help improving the RF quality of signals more.

In addition, illustrated that above to make each focusing coil 20,20 different with interval G1, the G2 of each magnet 19,19, make the situation of force unbalance of two focus direction on each face in opposite directions act on lens mount 2 thus, but, make the power F of two focus direction on each face in opposite directions that acts on lens mount 2 1, F 2Unbalanced formation is not limited to this, for example, also can make the number of turn of a pair of focusing coil 20 different, like this, make and perhaps, also can make the magnetic flux density difference that produces in each focusing coil 20 different with the magnetic force of each focusing coil 20,20 magnet 19,19 in opposite directions respectively.

Below, second embodiment of optical pick-up of the present invention is described.

The difference of second embodiment and above-mentioned first embodiment is the configuration of focusing coil and tracking coil.

Fig. 7 is the front elevation that the focusing coil in the optical pick-up of expression second embodiment and the configuration of tracking coil constitute.

In the following description, with the common part of above-mentioned first embodiment, annotate with common symbol, its detailed description is omitted.

In the optical pick-up of present embodiment, as shown in Figure 7, supporting arm 80 constitutes by being positioned at a pair of left supporting arm 802 and a pair of right supporting arm 804 object lens 7 both sides, that tangentially extend.A pair of left supporting arm 802 and a pair of right supporting arm 804 are differently setting respectively at the height of the optical axis direction of object lens 7.

And, be positioned among the arm support 8 of connecting portion of the upper support arm 80A of upside and lens mount 2 and a pair of right supporting arm 804 first imaginary axis of arm support 8 that is positioned at the connecting portion of the lower support arm 80B of downside and lens mount 2 as optical axis direction as optical axis direction and be made as L1 at object lens 5 at object lens 5 with connecting among a pair of left supporting arm 802.

In addition, be positioned among the arm support 8 of connecting portion of the lower support arm 80B of downside and lens mount 2 and the right supporting arm 804 second imaginary axis of arm support 8 that is positioned at the connecting portion of the upper support arm 80A of upside and lens mount 2 as optical axis direction as optical axis direction and be made as L2 connecting among a pair of left supporting arm 802 at object lens 5 at object lens 5.

When the intersection point of establishing this first imaginary axis L1 of connection and the second imaginary axis L2 is O, this intersection point O and the driving center P t that driving force acted on that is produced by each tracking coil 30,30 by drive current being supplied to each tracking coil 30,30 are in sustained height (position of focus direction), and intersection point O and the center of gravity G of lens mount 2 that comprises object lens 7, focusing coil 20,20 and tracking coil 30,30 are in sustained height (position of focus direction).

In the present embodiment, the driving force F that produces by each focusing coil 20,20 by drive current being supplied to each focusing coil 20,20 1, F 2The driving center P f that is acted on does not comprise the position of center of gravity G of the lens mount 2 of focusing coil 20,20 and tracking coil 30,30 with respect to comprising object lens 7, stagger at the optical axis direction of object lens 7.That is the driving force F that produces by each focusing coil 20,20, 1, F 2The driving center P f that is acted on as shown in Figure 7, moves in the orientation down with respect to the optical axis direction of object lens 7.

When the height of the driving center P t of the height of intersection point O and each tracking coil 30,30 is inconsistent, when producing driving force by tracking coil 30,30, lens mount 2 is around swinging by intersection point O and at the axis that tangential direction is extended, be easy to generate skew radially, still, in second embodiment, because the height of intersection point O at object lens 7 optical axis directions, consistent with the height of the driving center P t of each tracking coil 30,30, so, skew radially can be suppressed.

In addition, when the height of intersection point O and the height of the center of gravity G of the lens mount 2 that comprises object lens 7, focusing coil 20,20 and tracking coil 30,30 are inconsistent, when producing driving force by tracking coil 30,30, lens mount 2 is easily around the axis synchronous vibration that passes through intersection point O and extend in tangential direction, but, in second embodiment, because the height of intersection point O is consistent with the height of the center of gravity G of the lens mount 2 that comprises object lens 7, focusing coil 20,20 and tracking coil 30,30, so, resonance can be suppressed, the frequency characteristic of optical pick-up 104 can be improved.

In addition, because object lens 7 are maintained at the position near CD in the lens mount 2, so, comprise object lens 7 and do not comprise the center of gravity G of the lens mount 2 of focusing coil 20 and tracking coil 30, optical axis direction at object lens 7, be displaced to the upper side that is positioned at the CD side, but, in second embodiment, by making each focusing coil 20,20 driving center P f does not comprise focusing coil 20 from comprising object lens 7,20 tracking coils 30, the centre of gravity place of 30 lens mount 2, optical axis direction at object lens 7 is displaced to the lower side of leaving CD, like this, make intersection point O with comprise object lens 7, focusing coil 20,20 and tracking coil 30, the center of gravity G unanimity of 30 lens mount 2.

Specifically, as shown in Figure 7, being installed in focusing coil 20 and tracking coil 30 on the face of lens mount 2 abreast, is that focus direction is installed with staggering with the coiling axis at the optical axis direction of object lens 7.

Like this, the optical pick-up of present embodiment, owing to the hammer that focusing coil 20,20 is used as the position of regulating center of gravity G uses, so, do not increase part count, can make the height of intersection point O consistent with the height of center of gravity G, can save cost, realize miniaturization.

Below, the 3rd embodiment of the present invention is described.In the following description, the part common with first embodiment annotated with common symbol, and its detailed description is omitted.

The optical pick-up 304 of the 3rd embodiment is used for selectively the optical disc apparatus that the CD with some kinds uses as recording medium.The CD of above-mentioned some kinds selectively uses some kinds of different light beams of wavelength to carry out the record or the regeneration of information signal.This kind optical disc apparatus for example uses first CD, second CD, the 3rd CD as recording medium.First CD employing wavelength is that the light beam of 400~410nm carries out the record or the regeneration of information signal.Second CD employing wavelength is that the light beam of 650~660nm carries out the record or the regeneration of information signal.The 3rd CD employing wavelength is that the light beam of 760~800nm carries out the record or the regeneration of information signal.

Like this, selectively adopt some kinds of CDs in this optical disc apparatus, these some kinds of CDs use the different light beam of wavelength respectively.In the employed optical pick-up 304 of this optical disc apparatus, as Fig. 8 and shown in Figure 9, the light beam different with wavelength adopts several object lens accordingly.For example, have first object lens 71 and second object lens 72, first object lens 71 be used for wavelength be the beam condenser of 400~410nm to first CD, it is the light beam of 650~660nm and beam condenser to the second or the 3rd CD that wavelength is 760~880nm that second object lens 72 are used for wavelength.

The optical pick-up 304 of the 3rd embodiment, as Fig. 8 and shown in Figure 9, with aforesaid optical pick-up 104 similarly, have 1 lens mount 2, first and second object lens 71,72 are installed on this lens mount 2.Here, first and second object lens 71,72 bearing of trend of being configured in supporting arm 80 is on the tangential direction Tz.Here, the fixed part side that first object lens 71 are configured in supporting arm 80 is arm support 3 sides, and second object lens 72 are configured in the front of lens mount 2.

The lens mount 2 of first and second object lens 71,72 is installed,, is supporting the both sides of the center section between first and second object lens 71,72 optical axises by supporting arm 80 at the bearing of trend of supporting arm 80.Promptly, the both sides of the center section between first and second object lens 71,72 optical axises are provided with arm support 8, the leading section of supporting arm 80 is fixed on this arm support 8, like this, lens mount 2 is being supported, and making the lens mount 2 at least can be in focus direction F and two mutually orthogonal direction of principal axis displacements of tracking direction T.

In addition, the position that the leading section that is supported arm 80 of lens mount 2 is supporting preferably is positioned at the both sides of the center of gravity of the lens mount 2 that focusing coil 20,20 and tracking coil 30,30 are installed.By supporting this position, first and second object lens 71,72 can not produce and ground such as reverse in focus direction F and tracking direction T displacement stably.

The optical pick-up 304 of present embodiment, as shown in Figure 9, among two magnet 19,19, the pole surface of one side's magnet 19 and to face between the coil surface 24 of side's focusing coil 20 of pole surface of this side magnet 19 be G1 at interval, the pole surface of the opposing party's magnet 19 and to face between the coil surface 24 of the opposing party's focusing coil 20 of pole surface of this opposing party's magnet 19 be G2 at interval makes that G1, G2 are inequality at interval.

To be assembled at least one governor motion that can tangentially support slidably in yoke 18 on the substrate 60 and the rest pad 3 by being provided with, can carry out the setting of G1, G2 at interval at an easy rate, this governor motion can be suitable for existing known various mechanisms.

Like this, when the interval G1 between each focusing coil 20 and the magnet 19, when G2 is set at different value, the density in the magnetic field that produces between side's focusing coil 20 and the side's magnet 19, with between the magnetic density of generation between the opposing party's focusing coil 20 and the opposing party's magnet 19, produced difference, act on the power F of a pair of focus direction on each face in opposite directions of lens mount 2 1, F 2Become uneven.

In such formation, if handle arrives a pair of focusing coil 20,20 with focus error signal corresponding driving current supply, lens mount 2 is tilted, make tilt angle varied.

At this moment, if supply to a pair of focusing coil 20 respectively, the big or small identical words of 20 drive current, then can correspondingly make tilt angle varied with the focus direction position (amount of movement) of lens mount 2, but, as previously mentioned, if measurement result according to the deviate of RF signal, the drive current of different sizes is supplied to each focusing coil 20 respectively, 20 words, then the focus direction position (amount of movement) with lens mount 2 correspondingly makes tilt angle varied, simultaneously, supply to the size of the drive current of each focusing coil 20 by control, can more critically regulate the pitch angle, help improving the RF quality of signals more.

In addition, illustrated above by making each focusing coil 20,20 different with interval G1, the G2 of each magnet 19,19, and make the situation of force unbalance of two focus direction on each face in opposite directions act on lens mount 2, but, make the power F of two focus direction on each face in opposite directions that acts on lens mount 2 1, F 2Unbalanced formation is not limited to this, for example, also can make the number of turn of a pair of focusing coil 20 different, like this, make and perhaps, also can make the magnetic flux density difference that produces in each focusing coil 20 different with the magnetic force of each focusing coil 20,20 magnet 19,19 in opposite directions respectively.

In the 3rd embodiment, also can be set at two magnet 19 pole surfaces and the interval G1 of the coil surface 24 of two focusing coils 20 identically, the interval G2 of the coil surface 34 of two magnet 19 pole surfaces and two tracking coils 30 is set in the same manner constitutes.At this moment, by changing the size of the drive current that supplies to a pair of focusing coil 20,20 respectively, can carry out the control at pitch angle.

In the 3rd embodiment, in the optical pick-up 304 that two object lens 71,72 is installed on the common lens mount 2, also can not increase part count, regulate the pitch angle, the weightization that can suppress the movable part that causes by adopting several object lens 71,72 can be with little drive current drive controlling object lens 71,72 stably.

Adopted the available little drive current optical disc apparatus of the optical pick-up 304 of drive controlling object lens 71,72 stably, not only can save electric power, and can with focus error signal and tracking error signal or skewed control signal correspondingly with object lens 71,72 drive displacement exactly, can improve the record or the reproducing characteristic of information signal.

The present invention is not limited to reference to the illustrated the foregoing description of accompanying drawing, and various changes, the displacement carried out under the prerequisite that does not break away from claims scope and purport thereof all are that this area ordinary skill is expected easily.

Claims (11)

1. an optical pick-up is characterized in that, has lens mount, rest pad, supporting arm, a pair of focusing coil, magnet and a pair of tracking coil;
Described lens mount is used to support at least one object lens;
Described rest pad, with the tangential direction of the focus direction quadrature of the optical axis direction that is parallel to described object lens, with described lens mount devices spaced apart setting;
Described supporting arm connects described lens mount and described rest pad, can make described lens mount support described lens mount with respect to described rest pad movably at described focus direction and the tracking direction that is orthogonal to described tangential direction;
Described a pair of focusing coil is located on the described lens mount, by supplying with drive current described lens mount is moved in described focus direction;
Described magnet is bearing on the yoke, respectively with described a pair of focusing coil in opposite directions;
Described a pair of tracking coil is installed on the described lens mount opposite to each other with described magnet, by supplying with drive current described lens mount is moved at described tracking direction;
Described a pair of focusing coil have with the coiling axis quadrature of each focusing coil and with described magnet coil surface in opposite directions, across described object lens in described tangential direction position toward each other, with perpendicular to described tracking direction and be parallel to tangential direction and the imaginary axis of optical axis by described object lens is staggered positions ground to the left and right, center, with described coil surface towards described tangential direction be installed on the described lens mount
Described a pair of tracking coil have with the coiling axis quadrature of each tracking coil and with described magnet coil surface in opposite directions, across described object lens ground in described tangential direction position toward each other, with perpendicular to described tracking direction and be parallel to tangential direction and the imaginary axis of optical axis by described object lens is staggered positions ground to the left and right, center, with described focusing coil side by side, with described coil surface towards described tangential direction be installed on the described lens mount
In addition, described supporting arm is made of side's supporting arm and the opposing party's supporting arm, this side supporting arm and the opposing party's supporting arm are configured in perpendicular to described tracking direction and are parallel to tangential direction and the both sides of the imaginary axis of optical axis by described object lens, described side's supporting arm and the opposing party's supporting arm respectively have a pair of, are configured in side by side on the optical axis direction of described object lens;
First imaginary axis on the end face of the lens mount that disposes focusing coil and tracking coil is side by side coupling together the lower support arm of the optical axis direction lower side that is positioned at described object lens among the connecting portion of the upper support arm of the optical axis direction upper side that is positioned at described object lens among described a pair of side's supporting arm and described lens mount and the described a pair of the opposing party's supporting arm and the connecting portion of described lens mount; Second imaginary axis on the end face of the lens mount that disposes focusing coil and tracking coil is side by side coupling together the upper support arm of the optical axis direction upper side that is positioned at described object lens among the connecting portion of the lower support arm of the optical axis direction lower side that is positioned at described object lens among described a pair of side's supporting arm and described lens mount and the described a pair of the opposing party's supporting arm and the connecting portion of described lens mount; The intersection point that connects this first imaginary axis and second imaginary axis be formed on by drive current that supplies to described each tracking coil and the identical height in driving center that driving force acted on that produces from the effect of the magnetic flux of described magnet, simultaneously, constitute the height identical with the center of gravity of the described lens mount that comprises described object lens, described focusing coil and described tracking coil, and, the driving center of focusing coil is with respect to the position of the center of gravity of lens mount, along the optical axis direction skew of object lens.
2. optical pick-up as claimed in claim 1, it is characterized in that, be installed in described focusing coil and described tracking coil on the face of described lens mount, position on the optical axis direction of the object lens that are supported on described lens mount, coiling center is installed with staggering.
3. optical pick-up as claimed in claim 1 is characterized in that, on described lens mount, disposes and supporting two object lens in described tangential direction.
4. optical pick-up as claimed in claim 1, it is characterized in that, by the drive current that supplies to described each focusing coil with from the driving center that driving force acted on that the effect of the magnetic flux of described magnet produces, be configured to optical axis direction displacement from the centre of gravity place of described lens mount that described object lens only are installed towards described object lens the position.
5. optical pick-up as claimed in claim 1 is characterized in that, the interval between described each magnet that is disposing opposite to each other with the coil surface of described a pair of focusing coil and the coil surface of described each focusing coil is identical on described tangential direction.
6. optical pick-up as claimed in claim 1 is characterized in that, and the interval between the coil surface of described each magnet of disposing opposite to each other of the coil surface of described a pair of focusing coil and described each focusing coil is inequality on described tangential direction.
7. an optical disc apparatus has driving mechanism and optical pick-up;
Described driving mechanism keeps CD and drives its rotation;
Described optical pick-up carries out the record of information signal or the light beam of regeneration to the CD irradiation of being rotated by described drive mechanism, simultaneously, detects the folded light beam from described CD reflection; It is characterized in that,
Described optical pick-up has lens mount, rest pad, supporting arm, a pair of focusing coil, magnet and a pair of tracking coil;
Described lens mount is used to support at least one object lens;
Described rest pad, with the tangential direction of the focus direction quadrature of the optical axis direction that is parallel to described object lens, with described lens mount devices spaced apart setting;
Described supporting arm connects described lens mount and described rest pad, can make described lens mount support described lens mount with respect to described rest pad movably at described focus direction and the tracking direction that is orthogonal to described tangential direction;
Described a pair of focusing coil is located on the described lens mount, by supplying with drive current described lens mount is moved in described focus direction;
Described magnet is bearing on the yoke, respectively with described a pair of focusing coil in opposite directions;
Described a pair of tracking coil is installed on the described lens mount opposite to each other with described magnet, by supplying with drive current described lens mount is moved at described tracking direction;
Described a pair of focusing coil have with the coiling axis quadrature of each focusing coil and with described magnet coil surface in opposite directions, across described object lens in described tangential direction position toward each other, with perpendicular to described tracking direction and be parallel to tangential direction and the imaginary axis of optical axis by described object lens is staggered positions ground to the left and right, center, with described coil surface towards described tangential direction be installed on the described lens mount
Described a pair of tracking coil have with the coiling axis quadrature of each tracking coil and with described magnet coil surface in opposite directions, across described object lens in described tangential direction position toward each other, with perpendicular to described tracking direction and be parallel to tangential direction and the imaginary axis of optical axis by described object lens is staggered positions ground to the left and right, center, with described focusing coil side by side, with described coil surface towards described tangential direction be installed on the described lens mount
In addition, described supporting arm is made of side's supporting arm and the opposing party's supporting arm, this side supporting arm and the opposing party's supporting arm are configured in perpendicular to described tracking direction and are parallel to tangential direction and the both sides of the imaginary axis of optical axis by described object lens, described side's supporting arm and the opposing party's supporting arm respectively have a pair of, are configured in side by side on the optical axis direction of described object lens;
First imaginary axis on the end face of the lens mount that disposes focusing coil and tracking coil is side by side coupling together the lower support arm of the optical axis direction lower side that is positioned at described object lens among the connecting portion of the upper support arm of the optical axis direction upper side that is positioned at described object lens among described a pair of side's supporting arm and described lens mount and the described a pair of the opposing party's supporting arm and the connecting portion of described lens mount; Second imaginary axis on the end face of the lens mount that disposes focusing coil and tracking coil is side by side coupling together the upper support arm of the optical axis direction upper side that is positioned at described object lens among the connecting portion of the lower support arm of the optical axis direction lower side that is positioned at described object lens among described a pair of side's supporting arm and described lens mount and the described a pair of the opposing party's supporting arm and the connecting portion of described lens mount; The intersection point that connects this first imaginary axis and second imaginary axis be formed on by drive current that supplies to described each tracking coil and the identical height in driving center that driving force acted on that produces from the effect of the magnetic flux of described magnet, simultaneously, constitute the height identical with the center of gravity of the described lens mount that comprises described object lens, described focusing coil and described tracking coil, and, the driving center of focusing coil is with respect to the position of the center of gravity of lens mount, along the optical axis direction skew of object lens.
8. optical disc apparatus as claimed in claim 7 is characterized in that, on described lens mount, disposes and supporting two object lens in described tangential direction.
9. optical disc apparatus as claimed in claim 7 is characterized in that, coil surface and described each magnet of described each magnet that is disposing opposite to each other with the coil surface of described a pair of focusing coil and described each focusing coil are inequality at the interval of described tangential direction respectively.
10. optical disc apparatus as claimed in claim 7 is characterized in that the number of turn of described a pair of focusing coil is inequality.
11. optical disc apparatus as claimed in claim 7, it is characterized in that, respectively the coil surface of described each magnet that is disposing opposite to each other with the coil surface of described a pair of focusing coil and described each focusing coil and described each magnet described tangential direction be identical at interval, the number of turn of described a pair of focusing coil has nothing in common with each other.
CNB200580000531XA 2004-05-14 2005-05-13 Optical pickup and optical disk device CN100385530C (en)

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JP5261115B2 (en) * 2008-02-29 2013-08-14 三洋電機株式会社 Pickup device
CN101587222B (en) * 2008-05-21 2011-05-11 香港应用科技研究院有限公司 Lens actuating device, optical system and camera

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JPH1166587A (en) * 1997-08-21 1999-03-09 Sony Corp Objective lens drive, optical pickup device using the same and optical recording/reproducing apparatus
JP2000113477A (en) * 1998-10-05 2000-04-21 Hitachi Media Electoronics Co Ltd Objective lens driving device
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JP2003168230A (en) * 2001-07-18 2003-06-13 Matsushita Electric Ind Co Ltd Optical pickup actuator and optical disk device

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Publication number Priority date Publication date Assignee Title
JPH05128559A (en) * 1991-10-31 1993-05-25 Ricoh Co Ltd Driving apparatus of objective lens
JPH1166587A (en) * 1997-08-21 1999-03-09 Sony Corp Objective lens drive, optical pickup device using the same and optical recording/reproducing apparatus
JP2000113477A (en) * 1998-10-05 2000-04-21 Hitachi Media Electoronics Co Ltd Objective lens driving device
JP2002150584A (en) * 2000-11-09 2002-05-24 Matsushita Electric Ind Co Ltd Device for driving object lens
JP2003168230A (en) * 2001-07-18 2003-06-13 Matsushita Electric Ind Co Ltd Optical pickup actuator and optical disk device

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