TW556176B - Objective lens drive apparatus for use in optical pickup - Google Patents

Abstract

Within the same magnetic gap of a magnetic circuit including at least one magnet magnetized in multi-polarities, there is disposed a coil unit with a focus coil, a tracking coil and a tilt coil mounted thereon.

Description

556176

V. Description of the invention Invention __ Back stand single type drive device, which is used to form a disc-type drive from $ 釺: two heads, projecting light spots on the recording medium, and reading information optically from 0 recorded media. . The sub-optical optical pickup head is usually driven by an objective lens and an optical system including an objective lens and an optical system that transmits light to the objective lens to place the light placed in the objective lens. And _ fixed components, the moving components include the two brothers, coils, and tracking coils, and the fixed components include magnetic electric temperature. The moving parts are supported on the fixed parts by four lines, each line is elastic The damping member is surrounded and clamped by a viscoelastic member. As for the objective lens driving device, it can not only drive the objective lens in the focusing direction and tracking, but also correct the light spot (which is an image formed on the disc). Aberration and astigmatism, such an objective lens driving device is known as the device disclosed in Japanese Patent Laid-Open No. Hei 9-2 3 1 5 9 5. The characteristics of this conventional device are shown in Figs. 38, 39, and 40. As shown, at least a pair of optical sensors 1301, 132 are provided on the surface of the lens holder lioi located above the optical disc, which are extended in the radial direction of the optical disc or connected to the tangent of the objective lens. Stretching in the direction of the lens One or two sides of the holder 11 〇1 are arranged in the radial direction of the optical disk, and a coil 1 1 〇5 is provided. The coil is used to correct the tilt of the objective lens; and a pair is provided on the side of the lens holder 1101. On a pair of yokes 1113 and 1114, a pair of magnets 11 06 and 11 07 with opposite polarities are provided, which are used to adjust the tilt of the objective lens, and the setting method can correspond to the position of the coil 11 05

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Therefore, the inclination of the objective lens relative to the optical disc 1100 is detected based on the outputs of the optical sensors 1 3 0 1 and 1 3 0 2. According to the calculated values of the displacement between the collimator lens collimator and the optical axis of the objective lens thus detected, 力: force: = coil 11 0 5 is used as the slope weighting to drive the coil 11 〇5, because the coil 11 〇5 and The electromagnetic interaction between the magnets 1106 and 1107 with opposite polarities, ^ the side of the lens holder 1 1 01 is driven, so the side of the lens holder 丨 丨 01 can be servo controlled in a freely tilting manner.

The pair of optical sensors 1 3 〇1 and 1 3 0 2 are respectively mounted on both sides of the lens holder 1101 and the objective lens 11 03. As shown in FIG. 39, the optical sensor is used to receive the light emitted by the optical head and transmitted by the optical head. The primary light 12i, 1202 is diffracted by the groove of the optical disc. = As shown in FIG. 41, the electric signal borrow amplifiers 1407, obtained from the optical sensors 1301 and 1 302. 1408 is amplified, and then the difference is input to the difference amplifier 1403. From the output of the difference amplifier 1403, the tilt between the optical disc 1100 and the lens holder 1101 is calculated. As shown in FIG. 41, from the thus obtained inclination angle and the displacement between the optical axis of the objective lens and the optical axis of the quasi-mirror, it is better to use the section set to ROM (read-only memory) = section 1 404, Calculate the optimal inclination angle of the lens; based on the above two calculations, the "positive, inclination angle positive coil 1" and "05" are driven through the phase compensation circuit 1405 and the drive amplifier 1 406 for servo control.

Refer to the structure of lens holder 11 〇 丨 on its flat surface to form two openings, 41102, and the relevant yoke members 丨 丨 〇9 can be inserted into the two openings 丨 丨 〇2; for lens holding ^ 1 ιοί the middle, the objective lens 1103 is set up; and on the side opposite to the father of the lens holder 1 01, a square flat coil is provided for borrowing two or eight coils 1104 for tracking driving. Also, in the lens holder 1101

556176 V. Description of the invention (3)-On the facing surface, 'a pair of square flat coils are provided as the tilt correction coils 11 0 5 in the radial direction (R) of the optical disc; above and below the tilt correction coils 11 05' A printed circuit board (not shown) is provided, and the printed circuit board is supported by the copper foil portions 111 5 and 111 6. 1. Set the yoke parts i 丨 〇9, 1 丨 丨 〇 on the actuator base 1 1 08 in a projection manner; the yoke parts 1109 and 111〇 form a substantially closed magnetic circuit application via the magnets im and 1112; execute water Focus direction and vertical direction drive. On the two sides of the actuator base 1108, two side yokes n 13, 1114 are provided. The side yoke system is used for adjusting the tilt of the lens holder, and the top plan views thereof respectively show a horseshoe shape. On each side yoke 1113, 1114, slender magnets 1 106 and 1107 having opposite polarities are provided, and the arrangement is corresponding to above and below the coil 1 105 for slope correction. Also, similar to the foregoing, a square printed circuit board 1117, 1118 is further provided on the actuator base ^ 08 through the copper foil portions 1119, 112. Four spring wires 11 2 1 made of phosphor brass are connected to the lens holder 丨 j 丨, so the spring wire 11 2 1 is fixed by a printed circuit board provided at both ends of the spring wire 丨 丨 2 丨 such as ^ The lens holder 1101 is elastically supported by a spring wire 1121 (for the fixing of the spring wire 1121, refer to the plan view shown in FIG. 40). In FIG. 38, reference symbol F denotes a focusing axis of the objective lens actuator moving system, R denotes a tracking axis thereof, and τ denotes a disc tangent axis. Next, the tilt driving of the lens holder hoi according to the prior art will be described later with reference to FIG. 39. In the case where the current directions for the left and right tilt correction coils 1105 are respectively set in the radial direction of the optical disc, the two sides of the lens holder ιιι are set in the same direction, and the left and right magnets 11 06 and 11 07 Magnetic Field Page 6 C: \ 2D-C30DE \ 91-03 \ 90132195.ptd 556176

The directions are set symmetrically, so that they correspond to the upper and lower sides of the tilt correction coil 1105, and the electromagnetic driving forces of the right and left coils are different from each other according to Fleming's law (refer to arrow symbols F and Γ in FIG. 39). Therefore, although the center of gravity or the fulcrum center of the lens holder Is 11 0 1 is set substantially at the same point, when the lens holder 1 101 is rotated around this point, the tilt of the lens relative to the disc 1 100 can be corrected. However, in the aforementioned conventional technology, in order to correct the tilt of the objective lens, it is necessary to separately install a coil UM and magnets 1106 and 1107 separately from the tracking servo and the focusing servo coil and magnet. As a result, the cost of the objective lens driving device increases. According to the conventional technology, the coil for tilt correction 丨 i 0 5 and the magnet 1 1 〇1 1 〇7 must be set on the lens holder 1 1 〇1 of the smooth holding objective lens 1 1 〇1 in the radial direction 11 00 On the side, as a result, the width and weight of the objective lens driving device are widened. SUMMARY OF THE INVENTION The present invention is directed to solving the problems of the aforementioned conventional techniques. Now, a first characteristic aspect of the present invention that solves the aforementioned problems will be described with reference to FIG. 1 corresponding to a specific embodiment 1 of the present invention. According to the first characteristic aspect, a coil unit 3 is provided inside the magnetic circuit with at least one magnetic gap 5g of the multipolar magnetized magnet 5, and the coil unit is provided with a focusing coil 3f, a vertical coil 3tr, and a tilt coil. 3ti. In the first aspect, a multipolar magnetized magnet 5 is used to correct the tilt of the objective lens, which eliminates the need to provide an exclusive magnet, which is used exclusively to correct the tilt of the objective lens. Hereinafter, a description will be given with reference to FIG. 2 corresponding to a specific embodiment 2 of the present invention.

556176 V. Description of the invention (5) The second characteristic aspect of the present invention that addresses the problem. According to the second characteristic aspect, two magnetic circuits are completed, each of which has at least one magnetized with multipolarity, a magnet 10 05 ′, and a coil single tgI 03 ′ inside a magnetic gap 1 05 g of each magnetic circuit. A focusing coil is set thereon. 3f. Tracking coil: 〇3tr and tilt coil 1 0 31 i. In the second aspect, the use of a multipolar magnetized magnet 105 for correcting the tilt of the objective lens can eliminate the need to provide an exclusive magnet, which is used exclusively to correct the tilt of the objective lens.

) Further, the third characteristic aspect of the present invention which solves the foregoing problems will be described with reference to the specific embodiment 3 of the present invention corresponding to FIG. According to a third characteristic aspect, 'an objective lens driving device is provided for the optical pickup head, the optical pickup head measures the tilt of the optical disc, and adjusts the tilt of the objective lens according to the disc tilt signal', wherein at least one The coil circuit 203 is provided inside the same magnetic gap 205g of the magnetic circuit of the polarized magnet 2 05, and a plurality of focusing coils 203f 1, 203fr, and tracking coil 203t are set thereon. A current is applied to each of the plurality of focus coils 203n and 203fr, and the focus servo is performed due to the sum of the driving forces of the focus coils 203f1 and 203fr. Due to the aforementioned difference in driving force ', a moment is generated around the center of gravity of the moving part, whereby the tilt of the objective lens 202 can be adjusted simultaneously with the focus servo operation. In the third aspect, the operation of the multiple focus coils 203n & 203fr not only performs the focus servo, but also adjusts the tilt of the objective lens 202. Blanket_Best Embodiment 1 Detailed Description (Embodiment 1)

556176 V. Description of the invention (6) And Miao # is an exploded perspective view of the objective lens driving device used in the optical pickup head of the present invention. In the figure}, the component number i means transparent = cool holding: 2 is the objective lens, 3 is the coil unit, "is the focusing coil, the gap '<", the tracking coil 3tl is the tilt coil, 5 is the magnet and 5g is Magnet ^ f ^ holder 1 is made of lightweight metal with a high elastic modulus of elasticity. For example, I = carbon or resin mixed carbon fiber. The use of this material allows the lens holder 1 = body = higher flexural modulus of elasticity, and therefore has a higher high-order resonance frequency j. Due to this factor, the lens holder 丨 can respond to the increase in the speed of the optical disc unit. = The lens holder 1 forms two notch portions la, and the two notch portions extend in the tracking direction τ, respectively. The objective lens mounting portion 1b is also formed in the lens holder 1 and has a uniform thickness structure. Each of the two notch portions 13 has a surface, and an insulating protection film (not shown) is formed on the surface for reinforcing insulation. The reason for intersecting the insulating protective film is to use the high flexural elastic modulus light metal such as magnesium alloy as the material of the lens holder 1 and the resin-contained carbon fiber has high conductivity, so it is intended to install the coil in the notch portion la The insulation of Unit 3 must be secure. Taking the insulation protection film for insulation reinforcement not formed on the surface of the notch portion 13 of the lens holder 1 as an example, the insulation protection film for insulation reinforcement (not shown in the figure) may be formed on the coil unit 3 to be mounted on the notch portion la. Part, thus ensuring the insulation of the coil unit 3. The coil unit 3 is a laminated coil unit, which includes: a required number of printed circuit boards 31, each of which has a pattern in which a focus coil 3f and four longitudinal coils 3tr are formed; and a required number of printed circuit boards 32, each of which forms \\ 312 \ 2d-code \ 91-03 \ 90132195.ptd Page 9 556176 V. Description of the invention (7) Two inclined coils 31 i, whereby two kinds of printed circuit boards 3 1 and 3 2 are alternately laminated and thus provided as a coil unit Pattern structure. The focusing coil 3 f is arranged in the middle of the printed circuit board 31; the tracking coil 31 r is arranged in the position of the center of gravity of the moving part (including the lens holder holding the objective lens 2) relative to the optical axis direction of the objective lens left and right ( In the direction of the vertical coil T), in other words, the focus coils 3f on the upper and lower stages are on the right and left sides. In this way, the tracking coil 31 r can also be composed of two tracking coils. The two inclined coils 31 i are disposed at the right and left (in the tracking coil direction τ) with respect to the center of the printed circuit board 32. The two inclined coils 3ti are connected in series.

The printed circuit boards 31 and 32 can be laminated alternately upward, for example, sandwiching the two sides of the printed circuit board 32 between the two printed circuit boards 31, so that they are symmetrically arranged when viewed from the tracking direction T. In this example, the driving points in all directions can be overlapped, which can prevent resonance (pitch resonance, pan resonance) that may be caused when the driving points are not overlapped. The description is related to the structure in which the focus line i3f and the tracking coil 3tr are formed on each of the two bands 31. However, the focus coil 3f and the longitudinal coil 3tr can also be divided into two printed circuit boards / 4 JL ^. Further as shown in Figure 8, the coil unit

The circuit board 31 and the printed circuit board 32, wherein the focus lines U and U are formed on the printed circuit board 31, and the tracking coil is brushed on the circuit board 32 ,. Fig. 8 shows a four tracking coil board 32 '. _ 此 姓名 / f = The longitudinal coil 3tr is also formed in the printing ^, so the printed circuit boards can also be alternately stacked upwards when π Γ. When the driving point is not heavy, it is left-right symmetrical, so it can be avoided. Likouri may cause resonance.

^ 6176 5. Description of the invention (8) The coil unit 3 is the holder 1. In the heel direction T, the & line is in a circle. The mouth part la 'is fixed to the lens holder groove 3v, q is solidly conductive to form six V-shaped cuts at both ends of the coil element 3) and fixed to 丄 彳 a, and one end of the cow 4 is respectively soldered (not shown in the figure) 4 of the ί-shaped slot 3b. It is used as the conductive elasticity of the lead wire. The medium-elastic piece is used to drive the double-sand green wish, and the blanket Dutian is provided with a total of six conductive elasticity J: = drive tilt coil: in other words, the clip Hold the lens holder, which is used as an example of the ^^ electroelastic member 4 having sufficient elasticity to be a conductive elastic member 4 = as follows: many, parts; therefore, Ifl. ^ ^ &Amp; (Not shown in the figure) The four conductive elastic members 4 to be used to connect to the remaining line service are used to drive the tilting coil to avoid the risk of components. Place support members and contact other magnets 5 during driving 5 It is connected to the yoke 7 provided on the yoke base 6 in a manner that the magnet 5 is magnetized in the focusing direction F with two polarities, and the boundary line 5b is between the magnet pole and the S pole. As shown in Fig. 2, the N pole and the The boundary line 5b between the s poles is located at the center of the magnet 5 and the focusing direction F, and the two magnets 5 are arranged opposite to each other in between. A magnetic gap 5g is formed, and the direction of the magnetic field line B is opposite to the focusing direction f of the magnetic gap 5g. As shown in FIG. 9, the magnetic circuit includes a magnet 5, and the coil unit may be disposed in the magnetic gap 5g. FIG. 10 shows that the magnetic circuit includes a magnet 5, can obtain the same operation as the aforementioned magnetic circuit case coil including two magnets 5 and a magnetic gap 5 g. In this way, the size of the entire objective lens driving device can be short. Here, the magnetic gap represents an air gap or an air path, The magnetic gap 5g in Fig. 9 is formed by a piece of magnet. The width W of the magnet 5 is determined as shown in Fig. 3, and when the coil unit 3 is provided in

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V. Description of the invention (9) The magnetic gap of 5g is supported by the elasticity of the conductive elastic member 4 in a cantilever manner at the moving neutral position of the moving part, in other words, the self-weighted position of the moving part in the focusing direction F, On the vertical sides A and C of the four tracking coils 3tr provided on the left and right sides of the two upper and lower stages (which extend parallel to the focusing direction F), the right and left inner vertical sides A and C can be set at a magnetic gap of 5 g Inside (here a magnetic gap exists inside the width W of the two opposing magnets 5); and as shown in FIG. 4, the vertical sides a ′ and c of the two inclined coils 31 i arranged on the left and right in a row are shown in FIG. 4. In (which extends parallel to the focusing direction F), the right and left outer vertical planes a 'and c' may be disposed inside the magnetic gap 5g. The height of the magnet 5 is determined as shown in FIG. 3, the horizontal sides b and d of the single focus coil 3 f (stretched perpendicular to the focus direction F), and the horizontal level of the tracking coil 3tr provided at the center of the printed circuit board 31. Sides B and C (stretched perpendicular to the focusing direction F) and the lower and outer horizontal sides B and D can be set inside the magnetic gap 5g (indicating that the magnetic gap exists inside the height of the two opposite magnets 5); As shown in FIG. 4, the horizontal sides b ′ and d ′ (extending perpendicular to the focusing direction F) of the tilt coil 31 i may be disposed inside the magnetic gap 5g. As shown in FIG. 3, the boundary line 5b between the N pole and the S pole of the magnet 5 is Positioned halfway between the horizontal side b and d of the focus coil 3f (extending perpendicular to the focusing direction F) and halfway between the bottom side b and the top side d. The horizontal sides B and D of the tracking coil 3tr (extending perpendicular to the focusing direction F) The bottom side B and the top side D of the horizontal side B and D (extending perpendicular to the focusing direction F) of the lower stage tracking coil 31 r are halfway between the horizontal side b of the tilt coil 31 i and the horizontal side b as shown in FIG. 4. The bottom side b 'and the top side d' (stretching perpendicular to the focusing direction F) are halfway between. The center of the magnet 5 substantially coincides with the center of the coil unit 3.

55617¾ V. Description of the invention (ίο) The coil unit 3 is arranged in the magnetic gap 5g, and the other end portion of the conductive elastic member 4 penetrates the wire base 8 and is fixed to the substrate 9 by welding. Therefore, the focus coil 3f, the tracking coil 3tr and the tilt coil 3ti mounted on the coil unit 3 can be installed inside the magnetic gap 105g. At the same time, the moving parts including the lens holder 1 holding the objective lens 2 can support the cantilever method, so It can move relative to the fixed component (which includes the magnet 5, the vehicle base 6, the yoke 7, the wire base 8 and the base plate 9). In Fig. 3, in the case where current is allowed to flow in the tracking coil 3 tr, the current (shown by the arrow) flowing on the vertical sides A and C (extending parallel to the focusing direction F) of the tracking coil 3 tr is based on Fleming ’s left-hand rule. The driving force is generated in the same direction. Also, in the example of letting current flow through the focusing coil, the current flows on the horizontal side of the focusing coil 3 f (extending perpendicular to the focusing direction f), and a driving force is generated in the focusing direction F according to Fleming's left-hand rule. Fig. 4 In the case where current is allowed to flow through the tilt coil 3 ti, the current (indicated by the arrow) flowing on the horizontal side b ', d' (vertical to the focus direction !? stretch) of the tilt coil 3ti is driven by the two tilt coils. Force F, according to Fleming's left-hand rule, is based on the interactive reverse direction of the focus direction. Due to the interactive reverse driving force F ', a moment centered on the center of gravity of the moving part is generated, so the tilt of the lens holder 1 can be adjusted, and the objective lens is thus adjusted. The tilt of 2. For example, if the focus coil 3 f and the vertical coil 31 r and the tilt coil 31 i are both installed in the same magnetic gap 5g of the magnetic circuit including at least one magnet, not only focus servo and tracking servo can be performed. At the same time, it can also perform tilt servo (that is, adjust the inclination of the objective lens 2). This eliminates the need to set a magnet, which is exclusively used to adjust the inclination of the objective lens 2 Hence the reason

\\ 312 \ 2d-code \ 91-03 \ 90132195.ptd Page 13 556176 V. Description of the invention (11) =, can reduce the number of parts, can be used for low cost, and the size of the entire lens drive device can be short . The structure of the "tilt" cycle, ^^^^ tilted coil out relative to the printed circuit (1⑽ and the vertical direction T) ° But even as shown in Figure 5, =-tilted coil 3ti is upward with respect to the center of the printed circuit board 32 And downward «set square ;: κ focus direction F), similar effects can still be obtained. In this case, the coil unit 3 has a structure as shown in Fig. 7, in which the required number of printed circuit boards (Figure Not shown, ^ ^. MT is not shown) each has a pattern including a tracking coil 3tr and four focus coils; and as shown in Figure 5, the required number of printed circuit boards (not shown in the figure) ) Each has a pattern, the pattern package = an inclined coil 3 11 is arranged alternately upwards from each other. One tracking coil 31 "is located in the middle of the printed circuit board 31; the four focusing coils 3f are placed at the position of the center of gravity in the direction of the optical axis of the objective lens-optical axis with respect to the moving parts (including the lens holder holding the objective lens 2) again. Right and left directions (in the tracking direction τ), in other words, left and right of a tracking coil 3tr in the upper and lower stages. The four focusing coils 3 f are connected in series. The four focus coils 3 f are also replaced by two focus coils. The two tilt coils 1 0 31 i are connected in series. The foregoing description relates to a structure in which the focus coil 3 f and the tracking coil 3 tr are provided on the same printed circuit board. However, it is also possible to use a structure in which the focusing, coil 3 f and tracking coil 31 are separately provided on two printed circuit boards

on. In this example, the 'printed circuit boards' are also stacked upwards, so they are left-right symmetrical when viewed from the tracking direction T. In this structure, as shown in FIG. 6, the magnet 5 is polarized in the tracking direction T, and the boundary line 5b is between the N and S poles of the magnet 5, and is connected to

: \ 2D.00DE \ 91-03 \ 90132195.ptd Page 14 556176 V. Description of the invention (12) Yoke 7 on the second base 6. As shown in FIG. 6, the boundary line 5b between the N and S poles is located at the center of the magnet 5 in the tracking direction T, and the magnetic gap 5g is formed because the two magnets 5 are oppositely arranged; and the magnetic field is in the direction of the magnetic field 5g. b is opposite to the tracking direction T. In addition, as shown in Figs. 9 and 10, a single magnet 5 may be used instead of the two magnets 5. In this example, the boundary 5b between the N and S poles is located at the center of the magnet 5 in the tracking direction T. Therefore, the overall objective lens driving device can be shortened.

The width W of the magnet 5 is determined as shown in FIG. 7. When the coil unit 3 is set at a magnetic gap 5g and is at a moving neutral position of a moving part supported by the conductive elastic member 4 in a cantilever manner, that is, at In the self-weighted position of the focusing direction j ?, not only the vertical sides a and c of the four focusing coils 3 f on the left and right sides of the upper and lower stages, and the right and left outer vertical sides (extending parallel to the focusing direction ρ) a and c, as shown in FIG. 5, at the same time, the vertical sides a 'and c of the two tilt coils 3ti in the upper and lower stages (extending parallel to the focusing direction F) can be set inside the magnetic gap 5g (indicating interaction) The width W of the opposing magnet 5 is within a gap). The orientation Η of the magnet 5 is determined not only as shown in FIG. 7, but also the horizontal side b, d (stretching perpendicular to the focusing direction F) of the upper stage focus coil 3f, the lower side b, and the horizontal side b, d (stretched perpendicular to the focusing direction F), the upper side d, and the horizontal sides B and D (stretched perpendicular to the focusing direction F) of the tracking coil 3tr. At the same time, as shown in FIG. 5, the horizontal side b 'of the tilt coil 31 i in the upper stage The upper side d of d '(extending perpendicular to the focusing direction F) and the horizontal side b' of d '(extending perpendicular to the focusing direction F) of the lower stage tilt coil 31 i are respectively provided inside the magnetic gap 5g (Indicates a gap existing inside the height Η of the counter-opposing magnet 5). The boundary 5 b between the N pole and the S pole of the magnet 5 is shown in FIG. 7.

556176 V. Description of the invention (13) The left side c of the vertical side a, c of the focusing coil 3 f (extending parallel to the focusing direction F) and the vertical side a, c of the left focusing coil 3 f (extending parallel to the focusing direction F) Midway between the right side a, and between the right side A and the left side C of the vertical sides A and C of the tracking coil 3tr (extending parallel to the focusing direction F), as shown in FIG. 5, are located on the vertical side a of the tilt coil 3ti The right side a ′ and the left side c, which extend parallel to the focusing direction F, are halfway between. The center of the magnet 5 substantially overlaps the center of the coil unit 3. In Fig. 7 'for the case where current is allowed to flow in the tracking coil 3 tr, the current (indicated by the arrow) flowing on the vertical sides A and C (extending parallel to the focusing direction F) of the vertical coil 3 tr Fleming ’s left-hand rule produces driving force φ originating in the tracking direction T; and in the case where current is allowed to flow in the focusing coil 3 f, the current flowing on the horizontal sides b, d (extending perpendicular to the focusing direction F) of the focusing coil 3 f (Indicated by arrows), so driving forces are generated at the four focus coils 3 f ′, which have the same directions in the tracking direction T according to Fleming's left-hand rule, respectively. In Figure 5, the case of allowing current to flow in the tilt coil 3 ti is due to the current (indicated by the arrow) flowing on the vertical sides a ,, c (extending parallel to the focusing direction f) of the tilt coil 3ti, according to Fleming's left-hand rule In the opposite direction to the father in the vertical direction T to generate driving force. Due to the reverse driving force, a moment is generated around the center of gravity of the moving part, thereby adjusting the tilt of the lens holder i and thus adjusting the tilt of the objective lens 2. In this specific embodiment, the magnet 5 has two poles magnetized in the focusing direction F or the tracking direction τ. But as non-limiting, as shown in Figure 丨 丨, the magnet 5 may include two magnet sections, each of which has two poles magnetized in the longitudinal direction and is provided separately.

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556176

V. Description of the invention (15) The structure of the magnet 5 has a four-pole magnetization case. Compared with the case where the magnet 5 has a two-pole magnetization case, the number of coils is reduced from seven to six, so the coils can be saved. Taking the magnet 5 with two pole magnetization as an example, the opposite part of the coil and the driving force generating direction of the coil must be set outside the magnetic gap 5g (in Fig. 3, on the A and C sides of the tracking coil 3tr; in Fig. 7) On the 3fib side and the d side of the focus coil). On the other hand, in the case of a four-pole magnetized magnet, these parts do not need to be placed outside the magnetic gap 5 g, so it is easy to set the coil. In the case where all the coils are arranged inside the magnetic gap 5g, the two opposite sides often cause the coil to move and force, thereby increasing the use rate of the coil.

In the foregoing specific embodiment, the magnet 5 is two- or four-pole magnetized. But it is not limited to this, for example, the structure of a magnet can also be shown in FIG. One pole (for example, S pole) of the front face of the zigzag and the other pole (for example, N pole) having a quadrangular face are inserted into the other space of one pole so as to obtain a quadrilateral front as a whole; thus, the magnet 5 has three poles magnetization. As shown in Figure 14 in this example, if the two vertical coils 31 r «are placed on the right and left again, that is, on the I-shaped material piece and on the N pole, let the current flow in the opposite direction. Via the two tracking coils 31 ", the second and longitudinal coils 3 11 · generate the driving force in the same direction as the tracking direction T. As shown in FIG. 4 as well, when the four focusing coils 3 f are disposed on the right, left, upper, and lower portions of the magnet 5, in other words, on the upper and lower portions of the i-shaped flange portion and on the N pole, And let the same-direction current flow through the two focus coils 3f 'set in the upper stage and let the current (the direction is the same direction, but the current is opposite to the previous stage) through the two focus coils 3f set in the lower stage, resulting in Four focusing coils 3 f · Driving force, which has the same direction as the focusing direction f. As shown in FIG. 15 as well, the four inclined coils 31 i are disposed on the right, left, up, and down of the magnet 5.

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Case, in other words, placed above and below the imitation flange portion and placed at the N pole case, so that a current with a counter current flows through the diagonal coil 3ti provided at the upper stage, and the currents (the directions of which are opposite to each other and The direction of the current from the upper stage to the opposite stage) flows through the second tilt coil 3ti provided in the lower stage and generates the driving force F of the right and left tilt coils 3ti, which have opposite directions to the focusing direction F. The driving force F in the opposite direction generates a moment centered on the center of gravity of the moving member, whereby the tilt of the lens holder i can be adjusted, and thus the tilt of the objective lens 2 can be adjusted. When the structure of the magnet 5 has a three-pole magnetization, as shown in FIG. 6, one pole (for example, the S pole) has a zigzag front side, and the other two poles (for example, the N pole) each having a quadrangular front side can be inserted into the one pole. Other spaces thus result in a magnet with a quadrilateral front face as a whole. In this case, as shown in FIG. 6, the four tracking coils 3 tr are disposed on the right, left, upper, and lower portions of the magnet 5 as an example. In other words, the four tracking coils 3 tr are disposed on the right and left portions of the imitation-shaped flange portion and are provided. For example n, let the opposite current flow through the second tracking coil 3tr provided in the upper stage, and let the opposite current flow in the same direction as the current direction of the previous stage flow through the second tracking coil 31r provided in the lower stage. The tracking coil 31 r generates a co-directional driving force F ′ having a tracking direction T. As shown in FIG. 16, the two focusing coils 3 f are arranged above and below the magnet 5 as an example. In other words, the imitation η-shaped material part and the N pole are made to allow currents with opposite directions to flow through the two. The focusing coil 3 f generates a driving force in the same direction as the focusing coil 3 f. As shown in FIG. 17, the four inclined coils 31 i are disposed on the right, left, upper, and lower portions of the magnet 5 as an example. In other words, the four inclined coils 31 i are disposed on the right and left portions of the imitation-shaped flange portion, and are disposed on the N pole. , Let the current with the opposite direction flow through the second stage set

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V. Description of the invention (17) Inclined coils 3ti, and currents in opposite directions to each other and in the direction opposite to the current in the upper stage, are passed through the two inclined coils 31 in the lower stage, and the driving force F 'is generated in the upper and lower inclined coils 3ti The driving force F has an opposite direction to the tracking direction τ. Since the driving force F 'has the opposite direction, a moment is generated centered on the center of gravity of the moving part, thereby adjusting the tilt of the lens holder 丨, and thus the tilt of the objective lens 2 can be adjusted. This embodiment uses four tilt coils 31 i, two or four focus coils 3 f and two or four heel coils 31 r. However, in the case of using the two inclined coils 31 i, as shown in FIG. 18, the magnet 5 is used as follows: In other words, one pole (such as the s pole) has a T-shaped front side, and each has a quadrilateral front side (such as the N pole). It is possible to insert the other space of the one pole, thus obtaining a magnet 5 having a quadrilateral front as a whole; thus the magnet 5 has three pole magnetization. In this example, the two tracking coils 31r are provided in the middle of the magnet 5, in other words, the zigzag vertical portion and the N pole are provided; and the two focusing coils 3f and two tilting coils 31i are provided to the right of the magnet 5 and The left part, that is, the horizontal part arranged in the shape of a τ-shape, and the N pole. As shown in FIG. 19, the magnet 5 is also used as follows: In other words, one pole (such as the S pole) has a U-shaped front face, and the other pole (such as the N pole) having a quadrangular front face is inserted into the other space of the one pole. A magnet having a quadrilateral front as a whole is thus obtained; thus the magnet 5 has a two-pole magnetization. In this case, a focusing coil 3 f is disposed in the middle of the magnet 5, that is, in a U-shaped horizontal portion and in the N pole, and the two vertical coils 31 r and the two inclined coils 31 i are disposed to the right of the magnet 5. And the left part, that is, the vertical part provided in the U shape and the N pole 0

C: \ 2D-CODE \ 91-03 \ 90132195.ptd Page 20 556176 V. Description of the invention (18) For a magnet with a two-pole magnetization, compare it with a two-pole magnet, similar to a four-pole magnet. Accelerate the configuration of the coils, thus increasing the use rate of the coils.

In this way, for a U-shaped two-pole magnetized magnet, a three-pole magnetized magnet, and a four-pole magnetized magnet, for example, similarly to the two-pole magnetized magnet 'coil unit according to the foregoing specific embodiment 1, it includes a plurality of three different types of stacked printed circuit boards: That is, the first type circuit board includes one or more focusing coils 3 f mounted on it. The second type includes one or more tracking coils 3tr mounted on it, and the third type includes one or more tilting coils 31 i. On it. The coil unit includes multiple two-type stacked printed circuit boards: that is, one type of printed circuit board includes one or more focus coils 3 f and one or more longitudinal coils 31 r mounted thereon; and another type of printed circuit board. One or more inclined coils 31 i are erected thereon. Further, the “coil saponin” may include multiple pieces of two-type stacked printed circuit boards: that is, one type of printed circuit board includes one or more focus coils 3 f and one or more tilted coils 31 i mounted thereon, and another type of printed circuit board. The board includes one or more tracking coils 3tr mounted thereon. The aforementioned structure includes a case of a U-shaped two-pole magnet, a three-pole magnet, and a four-pole magnet. As shown in FIGS. 1, 2 and 6, the magnetic gap 5 g can be borrowed by a single magnet 5 as shown in FIGS. 10 and 11. 'Defined. (Embodiment 2) Fig. 20 is a perspective view of Embodiment 2 of the objective lens driving device of the present invention. In FIG. 20, the component number 101 indicates a lens holder, 102 is an objective lens, 103 is a coil unit, 103f is a focusing coil, 103t is a tracking coil, 103ti is a tilt coil, 105 is a magnet and 105g is the magnetic gap.

\\ 312 \ 2d-code \ 91-03 \ 90132195.ptd Page 21 556176 V. Description of the invention (19) '---------- & Through two, the holding state 1 〇1 is caused by having high Lightweight metal with flexural modulus of elasticity includes 5¾ il 1 alloy or resin mixed carbon fiber. The use of this material allows the lens holder to have a high flexural modulus of elasticity, so it has a high order of 2: 2. Due to this factor, the lens holder 101 can respond to the increase in speed of the disc 7L. HC photo lens holder 101 structure, two f Ϊ +1 \ magnet 105 and car 107 (detailed later) can be inserted into this slot on the other side; 1 / is 1 〇 1 in the middle of the objective lens 1 02; on the side of a pair of lens holders (one, one, square, and the direction of the right direction T)), the convex block ir ^ lower soil holding block 11 2 can be placed on the support block Fix one end of the conductive elastic member 4); and fix the coil unit 103 on the side of a pair of lens holders 10 extending parallel to the tracking direction τ (detailed later). The 4Jr 1-strength 纟 ba edge protection film (not shown in the figure) is formed on the surface of the pair of lens holders (stretching parallel to the tracking direction τ). The reason for setting the insulation film is to ensure that the coil unit 103 mounted on the lens holder 1 0 ^. The reason for this is the high conductivity of the light metal in the flexible mold I used as the material of the lens holder. The light metal with magnesium alloy or resin mixed with carbon fiber has a high conductivity. In the case where the insulating protective film for reinforcement is not formed on the pair of side surfaces (extending parallel to the tracking direction τ) of the lens holder 101, the insulating protective film for reinforcement (not shown in the figure) may be formed on the lens holder to be erected. Holder ❿ 1 0 1 of the coil unit 10 3, so as to ensure the insulation of the coil unit 丨 〇3 Now I take the coil unit 1 〇3, the number of printed circuit boards 丨 3 1 each has a Focusing coil 1 〇3 f and four tracking coils 丨 31 31

556176 V. Description of the invention (20) Φ samples' and the required number of printed circuit boards 32, each of which has a pattern consisting of two oblique, loop 103ti layers or stacked on top of each other to form a coil unit 103. The focus coil 103 {is provided on the printed circuit board 13] [center; and the tracking coil 1 03tr is provided at the position of the center of gravity of the moving member (including the lens holder 101 and the lens holder 102) of the objective lens in the optical axis direction. The right and left directions (in the tracking direction T), in other words, the right and left sides of the focus coil 103f and the next two stages. Four tracking coils 丨 03tr are connected in series. In this way, the four-coil ‘coil 1 0 3 t Γ can also be replaced by the two-coil longitudinal coil. The two oblique coils 1 Q 31 i are located in the right and left columns with respect to the printed circuit board 丨 32 (in the tracking coil direction T). Two tilt coils} 〇 31 i series connected. The printed circuit boards 1 3 1 and 1 3 2 can be laminated. Therefore, the two sides of the printed circuit board 1 31 (extending parallel to the tracking direction τ) and the two sides of the printed circuit board 132 (extending parallel to the tracking direction T) should be tracked by When viewed in a directional direction, it is symmetrically arranged. For example, the printed circuit board 1 31 is disposed on the inner side of the objective lens 1 02, and the printed circuit board 1 3 2 is disposed on the outer side of the objective lens 1 02. In this example, the driving points in each direction can be overlapped with each other, so the resonance (pitch resonance, roll resonance) that may be caused when the driving points are not overlapped can be prevented. The foregoing description relates to a structure in which the focusing coil 103f and the tracking coil 103tr are formed on the same printed circuit board 31. However, the focusing coil 3f and the tracking coil 31r may be separately formed on two different printed circuit boards. As further shown in FIG. 8, the coil unit 3 ′ has a printed circuit board 31 and a printed circuit board 3 2 ′, wherein the focus coil 3 f and the tilt coil 3 ti are formed on the printed circuit board 31 ′, and the tracking coil 3tr is formed on Printed circuit board 32, on. FIG. 8 shows that four tracking coils 3tr are formed on the printed circuit board 32, but two tracking coils 3tr

C: \ 2D-OODE \ 91-O3 \ 90132195.ptd page 23 556176 5. Description of the invention (21) It can be formed on the printed circuit board 32. In this case, the printed circuit boards can also be stacked on top of each other, so that they are left-right symmetrical when viewed from the tracking direction T, so that resonances that may be caused when the driving points are not overlapped can be prevented. One end of the conductive elastic member 104 is fixed to the support block 112 of the lens holder 10 by solder (not shown), and a coil unit 103 is fixed on the support block. Two leads are needed to drive the focus coil, two leads are needed to drive the vertical coil and two leads are needed to drive the tilt coil, in other words, a total of six leads are needed. Here, the four-unit conductive elastic member is sufficiently elastic to support the lens holder as a moving member. Here, the conductive elastic member 104 can also be used as a lead. Therefore, the four-conductive elastic member 104 is used as four of the six leads, and the other leads (not shown) are connected to the remaining coils. The two coil units 103 are respectively set in the two magnetic gaps 105g, and the other ends of the conductive elastic member 104 are respectively penetrated through the wire base 108 and fixed by welding. "

Board 109. For this reason, the focusing coil, J 103f, tracking coil i〇3t] r, and tilt coil 1 〇3ti installed in the coil unit 〇〇3 can be set inside the magnetic gap 105, at the same time, including clamping the objective lens 2 The moving parts of the lens holder 10 are supported in a cantilever manner, so they can be moved relative to fixed parts \

The fixing member includes a magnet 105, a yoke base 106, a yoke 107, a lead wire 108, and a substrate 1009. The magnetic circuit structure and the arrangement of the focus coil, the vertical coil, and the tilt coil in the coil unit of the apparatus shown in FIG. 20 are similar to the foregoing specific embodiment 1, and are omitted here. Explanation (refer to Figures 2 to 4).

556176 V. Description of the Invention (22) As mentioned above, according to the present embodiment, two magnetic circuits are completed, each of which includes at least one magnet 1 magnetized at two poles, and a magnetic gap 1 at two magnetic circuits 1 05. In 〇5g, not only the focus coil 1 〇3f and the tracking coil 1 0 31 r but also the tilt coil 1 〇3 ti are provided. Therefore, not only the focus servo and tracking servo can be achieved, but also the tilt servo (that is, the inclination of the objective lens 102 can be adjusted). Therefore, the need to provide a magnet exclusively for adjusting the inclination of the objective lens 102 is eliminated. This reduces the number of parts, adjusts the inclination of the objective lens 102 at a low cost, and reduces the size of the overall objective lens driving device. The foregoing description is related to a structure in which the two inclined coils 1031 i are respectively disposed to the left and right of the center of the printed circuit board 132 (in the tracking direction T). However, similar to the specific embodiment 1, even if the two tilt coils 1031i are respectively set up and down (in the focusing direction F) with the printed circuit board 132 as the center, similar effects can be obtained. In this example, the structure of the magnetic circuit and the operation of the coil unit are similar to those of the specific embodiment 1, so the description is omitted here (refer to FIGS. 5 to 7). Further as in the specific embodiment 1, four tracking coils 103tr can be formed on the printed circuit board 131, and focus coils 103f and two tilt coils 103ti can be formed on the printed circuit board 1 3 2 (refer to FIGS. 8 and 9) . Further in this specific embodiment, the magnet 5 has a two-pole magnetization in the focusing direction F or in the tracking direction T. However, as in the specific embodiment 1, the coil may be provided in a magnetic gap ', which is defined by a U-shaped two-pole magnet, a three-pole magnet, and a four-pole magnet (see Figures 丨 to 丨 9). As shown in FIG. 21, the two magnetic circuits each include a magnet 105. This kind

\\ 312 \ 2d-code \ 91-03 \ 90132195.ptd Page 25 556176

In this case, the magnet 10 5 'and the yoke 107 are respectively provided at the center of the lens holder 101 and the outside of the lens holder 101. In this structure, there is no need to provide a slit in the lens center 101, so the overall objective lens driving device can be shortened. The magnetic circuit in this case is shown in Figure 22 or 228. The magnetic gap here indicates the air gap or air path. The magnetic gap 105g in FIG. 22A is formed by two magnets, and the magnetic gap 105g in FIG. 22B is formed by each magnet. Although Figs. 22A and 2B show a magnetic circuit including a two-pole magnetized magnet 1q5, a two-pole magnet, a three-pole magnet, and a four-pole magnet having a U-shaped magnet can also be applied to the magnetic circuit. In the uranium structure, the 'coil unit 103' is bonded and fixed to the side of the pair of lens holders 101 which extends parallel to the tracking direction. However, similar effects can be obtained even in other structures. The other structures complete two magnetic circuits as shown in FIG. 23, each of which includes at least one magnet 105 which is a two-pole magnetization in the focusing direction ρ; the magnetic gap in the magnetic circuit Inside the 1.05 g, focus coils 1 3 〇f are respectively wound around the sides of the lens holder 1 0 1; and the tracking coil 1 30tr and the tilt coil 1 3 0 ti are respectively provided in the lens holder 1 〇1 bis side (stretched parallel to the tracking direction T). Such two magnetic circuits may include a magnet, as shown in FIG. 21. Each focusing coil 1 3 0 f is a winding coil, and the lens holder 10 1 is used as its winding frame. Thus, it is easier to manufacture a focusing coil 1 3 0 f, which is a pattern formed on a printed circuit board. The tracking coil 130 tr and the tilt coil 130 ti are shaftless coils, respectively, and are mounted on the top of the focusing coil 130 f. However, the longitudinal coil 1 3 01 r and the inclined coil 1 3 01 i may be patterns formed on a printed circuit board. Tracking coil

C: \ 2D-OODE \ 91-O3 \ 90132195.ptd page 26 556176 V. Description of the invention (24) 130tr and tilt coil l30ti can also be winding coils, as shown in Figure 24 'Coil winding frame The 11 3 series is arranged to be convex from the side of the lens holder 1 (parallel to the tracking direction T), and the coils are each wound around the coil winding frame 丨 3. Further, one of the tracking coil 1 3 0tr and the tilt coil 1 3 01 i can be mounted on the focusing coil 1 3 0 f, and the other coil can be wound on the coil winding frame 113 〇 The magnet 1 05 is in the focusing direction F For two-pole magnetization, the boundary line 105b is interposed between the N and S poles of the magnet 105, is bonded to Y107, and is arranged on the vehicle base 106. The width W of the magnet 105 is determined as the moving neutral position of the moving part supported by the conductive elastic member 104 in a cantilever manner, that is, the self-weighted position of the moving part in the focusing direction F, as shown in the figure. As shown in FIG. 2, when the lens holder 1 0 1 is installed in the magnetic gap 1 05g, it is not only installed in the focus direction f, but also in the two left and right columns 1 3 01 r in the left and right columns of the tracking direction T. The right and left inner vertical sides a and C of the vertical sides A and C (stretching parallel to the focusing direction F) are set at the magnetic gap 105g, and are set at the stage below the focusing direction f and at the right and left columns of the tracking direction T. The second vertical side a of the tilt coil i3〇ti, and the right and left outer vertical sides a and c of c ′ (extending parallel to the focusing direction F) are also set at the magnetic gap 105g (indicating the existence of the second interaction) The width of the magnet 105 (the gap inside W). The height of the magnet 105 is determined as shown in FIG. 25. The horizontal sides B and D of the tracking coil 130tr (extending perpendicular to the focusing direction F) and the horizontal sides b and d of the tilt coil 130ti (vertical) Extending in the focusing direction F) can be set at a magnetic gap of 1.05 g (indicating the gap existing inside the height Η of the two opposed magnets 105).

\\ 312 \ 2d-code \ 91-03 \ 90132195.ptd Page 27 556176 V. Description of the invention (25) As shown in Figure 25, the boundary 105b between the N pole and the S pole of the magnet 105 is in tracking. The horizontal sides B and D of the coil 130tr (extending perpendicular to the focusing direction F), the bottom side B, and the horizontal sides b and d of the tilting coil woti, the bottom side b (extending perpendicular to the focusing direction F), and the top side d , Halfway through. The center of the magnet 105 is substantially the center of the lens misalignment holder 101. The focusing coil 130f is set up and down with a boundary line 105b between the N and S poles of the magnet 105 as a boundary. The upper and lower focusing coils 130f are connected in series, and the current directions of the upper and lower focusing coils 13f are reversed. The direction of the magnetic field lines of the two magnetic gaps i0g is opposite. In Figs. 23 and 24, each side of the tracking coil I30tr and the tilt coil 130ti is δ on one side of the lens holder 1 (which extends parallel to the longitudinal direction T). However, it is not limited to this, and other structures may be adopted; in other words, these sides may be mounted on one side of the lens holder 1, and these sides are set inside the magnetic gap 10 5 g, and a driving force may be generated For example, the vertical sides A and C of the tracking coil 3 0t Γ (refer to FIG. 25) (stretched parallel to the focusing direction f), and the vertical sides A and C allow the current to flow in the tracking coil 13otr. The tracking direction T can be generated. Driving force in the same direction. The lens inflammation holder 101 is set at two magnetic gaps 105 g, and the other end of the conductive elastic member 104 is penetrating the wire base 108 and fixed to the substrate 9 by welding. For this reason, the focusing coil 130f, the tracking coil 130tr, and the tilt coil 130ti can be disposed inside the magnetic gap 105g, and at the same time, the moving parts including the lens holder 101 holding the objective lens 102 can be cantilevered, so that The fixed parts can be moved relative to the fixed parts. The fixed parts include a magnet 105, a vehicle base 106, a yoke 107, a wire base 108, and a base plate 109.

\\ 312 \ 2d-code \ 91-03 \ 90132195.ptd Page 28 556176 V. Description of the invention (26) In Figure 23, in the case of allowing current to flow through the focusing coil i3〇f, because the current is in the magnetic gap 1 0g Flow, so the focus coil 1 30 f generates a driving force in the focus direction F according to Fleming's left-hand rule. In Figure 25, in the case where current is allowed to flow in the tracking coil 130 tr, the current (indicated by the arrow) flows on the vertical sides A and C of the tracking coil 13 tr (extending parallel to the focusing direction F), so it is in the two tracking coils. 130tr, according to Fleming ’s left-hand rule, generating driving force in the same direction as the tracking direction T; and in the case of allowing current to flow in the tilt coil 1 3 01 i, since the current (indicated by the arrow) is tied to the horizontal side b of the tilt coil 130ti, and d '(stretches perpendicular to the focusing direction F), so in the two tilt coils 13〇ti, according to Fleming's left-hand rule, a driving force in the opposite direction is generated in the focusing direction F. Since the driving force F ′ in the opposite direction generates a moment centered on the center of gravity of the moving part, the tilt of the lens holder 101 can be adjusted, and thus the tilt of the objective lens 102 can be adjusted. The foregoing description relates to a structure in which two tracking coils 1 3 01 r and two tilting coils 1 3 01 i are symmetrically arranged in the tracking direction T, and a driving force is generated in the same direction of the two tracking coils 1 3 01 r, and The two inclined coils 1 3 0ti generate a reverse driving force. However, as shown in FIG. 26, the vertical side A of the tracking coil 130tr (extending parallel to the focusing direction F) may be provided inside the width of the magnet 105, and the vertical side C of the tracking coil 130tr (extending parallel to the focusing direction F) may be provided. It is outside the width W of the magnet 105; at the same time, the tilt coil I30ti can be displaced outward in the tracking direction T relative to the center of the magnet 105. In addition, instead of the vertical coil 1 30tr, as shown in FIG. 25, two tracking coils 1 30tr are used; instead of the inclined coil 1 3 01i, as shown in FIG. 26, two inclined coils 1 3 01 i can be used. Further as shown in FIG. 26, the number of tracking coils 13 0 t r is 1, and as shown in FIG. 25,

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One structure can reduce the number of tilt coils 1 3 01 i connected to the objective lens drive. Brake weight. (Embodiment 3) FIG. 27 is a perspective view of a specific embodiment of the objective lens driving device according to the present invention. In FIG. 27, the component number 201 indicates a lens holder, 2002 is an objective lens, 203 is a coil unit, and 205 is a magnet. The structure of the lens holder 201 is similar to the foregoing specific embodiment! Used lens holder 1. The coil unit 203 includes a desired number of printed circuit boards 203p stacked on top of each other, and each printed circuit board 203P includes one tracking coil 203t and four & focus coils 203f 1 and 203 fr. The tracking coil 203t is located on the printed circuit board 203p, and the focusing coils 203f 1 and 203 fr are arranged in the upper and lower stages, and are connected to the center of gravity of the moving part including the lens holder 201 holding the objective lens 202 The position of the objective lens in the optical axis direction is set to the left and right thereof, in other words, to the right and left of the tracking coil 2 0 31. The number of the focus coils 2 0 3 f 1 and the number of the focus coils 2 0 3 f r may be one each. Since the current is supplied to the left and right focusing coils 203fl and 203fr, respectively, the left and right focusing coils 203fl and 203fr are not connected in series, but are independent of each other. The foregoing description relates to a structure in which the right and left focus coils 203f 1, 203 fr, and the tracking coil 2031: are arranged on the same printed ϋ ® plate 203p. However, as for the modified example of the specific embodiment 3, the left and right focus coils 203f 1, 203fr and the tracking coil 203t may be separately provided on two printed circuit boards. In this modification, the number of focusing coils provided on the printed circuit board may be an even number, and the number of tracking coils provided on the printed circuit board may be

\\ 312 \ 2d-code \ 91-03 \ 90132195.ptd Page 30 556176 V. Description of the invention (28) The coil unit 203 is inserted into the notch portion 201a of the lens holder 201 and is joined to the notch portion, so It is fixed to the lens holder 201. At the two ends of the coil unit 203 (in the tracking direction T), six V-shaped cutouts 203v are formed, and one side end of the six conductive elastic members 204 is fixed to the six V-shaped cutouts 2 by solder 203h, respectively. 〇3v. The conductive elastic member 204 used as a lead is composed of four focusing coil driving members 204 (2 X 2) and two tracking coil driving members 204, and there are six conductive elastic members 204 in total. In this way, the four conductive elastic members 204 are sufficient to elastically hold the lens holder 201 used as a moving part. Therefore, in the case of using four conductive elastic members 204 to hold the lens holder 201, the leads (in the figure) (Not shown) will be connected to the remaining coils. The magnetic circuit used in this embodiment is similar to the magnetic circuit shown in FIG. 6 used in Embodiment 1. Also, the magnetic circuit may include a magnet, as shown in Figs. In this case, the boundary between the N pole and the s pole is located at the center of the tracking direction T of the magnet 5 and is shown in Fig. 6. For this reason, the overall objective lens driving device can be reduced in size. The width W of the magnet 205 is determined as the neutral position of the moving parts supported by the conductive elastic member 204 in a cantilever manner, +

As early as 203 is set inside the magnetic gap 205g, the focus coils 203f 1 in the upper and lower stages and the right focus coils 203f in the upper and lower stages are perpendicular to the right sides a and 0 and left and right outside. Sides c and 3 (parallel to the focusing direction F) can be set inside the magnetic gap 205g respectively (indicating the existence of the opposite magnets)

556176 V. Description of the invention (29) 2 0 5 width W internal gap). The height η of the magnet 2 〇5 is determined as shown in FIG. 2. The horizontal sides b and d (extending perpendicular to the focusing direction F) of the focusing coils 203Π and 203 fr in the previous stage, and the bottom side b of the tracking coil 203t. The horizontal sides B and D (stretching perpendicular to the focusing direction ρ) can be respectively arranged inside the magnetic gap 205g (indicating the existence of the gap Η at the height Η of the interactive opposing magnet 205). As shown in FIG. 28, the boundary line 205b between the N pole and the S pole of the magnet 205 is not only halfway between the vertical sides A and C (extending parallel to the focusing direction f) of the longitudinal coil 2 0 31, but also is located on the left The right side a of the vertical side a, c of the focusing coil 203f (extends parallel to the focusing direction F) and the left side c of the right side a, c of the right focusing coil 203f (extending parallel to the focusing direction jv) are midway. The center of the magnet 2 05 substantially coincides with the center of the coil unit 203. The coil unit 203 is respectively provided at a magnetic gap of 2.05 g, and the other end of the conductive elastic member 204 penetrates the wire base 208 and is fixed to the substrate 209 by welding. In this way, the focusing coils 203fl, 203fr, and tracking coil 203t mounted on the coil unit 203 are set inside the magnetic gap 205g; meanwhile, the lens holder 201 including the objective lens 202 The moving part is supported by a cantilever type, so it can move relative to a fixed part, which includes a magnet 205, a yoke base 206, a yoke 207, a wire base 208, and a base plate 209. The tilt of the disc can be measured using a separately prepared tilt detection sensor, or it can be detected by the reproduction signal provided by the optical pickup. The tilt error signal and the focus error signal that have been obtained by using a tilt detection sensor or using an optical pickup reproduction signal are input to a control circuit as shown in Fig. 29; the control circuit calculates the optimal currents I 丨 and 丨 r , Which can force the focus coils 203fl and 203fr shown in FIG. 28 to correct the focus error and tilt at the same time.

556176 V. Description of the invention (30); Second, the control circuit turns out the currents 11 and 1r thus calculated. It belongs to 隹 5, but it is not connected to the objective lens driving device, which is executed not only for the following example, but the driving force F1 and Fr generated by the current 11 and Bu are detailed in this example; ; At the same time, tilt feeding is also performed due to the moment M = 1xd: Frxd, which is generated centered on the center of gravity of the lens holder 201 due to the driving force ^. Here d indicates the distance between the center of gravity G of the lens holder 201 and the focus coils 203fl, 203 &. I 4 A shows an example in FIG. 3 B and FIG. 3 B shows an example. This example is different from that in FIG. In this example, the force of movement in the focusing direction f is Fl + (-Fr), and the tilt is Flxd-(-Frxd). At any rate, the objective lens driving device performs the focus drive operation as a function of (F1 + Fr), and performs the tilt drive operation as a function of (F1-Fr). The left and right focus coils 203 fl and 203fr not only perform the focus servo, but also adjust the tilt of the objective lens 202. Therefore, the need to provide a coil and a magnet dedicated to adjusting the tilt of the objective lens 202 can be eliminated. In this way, the number of parts can be reduced, the tilt of the objective lens 202 can be adjusted at a low cost, and the size of the overall objective lens driving device can be reduced.

In the case where the tracking coil 2 0 3 is oppressed, the currents flowing in the vertical sides A and C (stretching parallel to the focusing direction f) of the tracking coil 2 031 (pointed by arrows in FIG. 28) are in the same direction as the tracking direction T. The driving force is generated, so the objective lens 202 can move in the tracking direction T according to the eccentricity of the recording medium. In the case where the coil unit 20 3 is inserted and joined to the notch portion 2 0 1 a of the lens holder 2 01, the number of magnetic gaps 2 0 5 g can be reduced to one. This can also reduce the number of parts. 'The tilt of the objective lens 202 can be adjusted at a low cost, and the objective lens can be reduced.

556176 V. Description of the invention (31) The overall size of the driving device. In the foregoing specific embodiment, using the left and right focus coils 203fl and 203fr not only performs the focus servo, but also adjusts the inclination of the objective lens 202. However, similar effects can also be obtained in the following structure: In other words, as shown in FIG. 31, the coil unit 203 includes a desired number of printed circuit boards 203p, which are stacked on top of each other, and each printed circuit board 203p includes a focusing coil 203f and Four tracking coils 203t; focusing coil 20 3f is set at the center of the printed circuit board 203p; tracking coils 203tu and 203 td are respectively attached to the center of gravity of the moving part (including the lens holder 201 holding the objective lens 202) by the objective lens The optical axis direction is set up and down, in other words, the tracking coils 2 0 3 tu and 2 0 31 d are set in the right and left columns of the focusing coil 2 0 3 f extending upward and downward; the magnet 2 0 5 is set in focus The direction is bipolar magnetization, and the boundary line 205 b is between the N and S poles of the magnet 205. In this structure, the magnetic circuit is similar to the magnetic circuit used in the specific embodiment 1 and is shown in FIG. 2. Thus, the magnetic circuit includes the magnet 5 'shown in Fig. 9, and the coil unit can be set at an air gap of 5 g. The magnetic circuit is shown in Fig. 10, and the similar operation of the coil when the magnetic circuit includes two magnets and a magnetic gap can be obtained as described above. In addition, the respective numbers of the tracking coils 203tu and 203td may be one here. Because the current is supplied to the upper and lower tracking coils 203tu and 203td respectively, their non-series connections are connected to each other independently. In this structure, the focusing coil 203f and the tracking coils 203tu and 203td are provided on the same printed circuit board 203p. However, the focusing coil 203f and the tracking coil 203 tu and 20 3 td may be separately provided on two different printed circuit boards. In this case, the focus coil and tracking coil to be installed on the printed circuit board

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The numbers can be 1 and even numbers, respectively.

2. The width W of the magnet 205 is determined by the neutral position of the moving part supported by the conductive elastic member 204 in a cantilever manner, in other words, the position of the weight of the part in the focusing direction F is shown in FIG. 3 As shown in Figure 2, when the coil single TO203 is set inside the magnetic gap 205g, the right and left tracking coils 203tu in the second upper stage and the right and left tracking coils 203t in the second lower stage (right and left of the vertical side a fC of J The inner vertical side c and the entrance (stretching parallel to the focusing direction ρ) can be sighed inside the magnetic gap 205g (indicating the gap existing between the width w of the interactive opposing magnets 20.5). Also, the height of the magnet 2 0Η As shown in FIG. 32, it is determined that not only the horizontal sides b and d of the focus coil 203f (extended perpendicular to the focus direction ρ) are located at the center of the printed circuit board 203f, but also the horizontal side B of the tracking coil 203tu in the previous stage The upper side d of D (stretched perpendicular to the focusing direction F) and the horizontal side B of the tracking coil 203td in the lower stage B and the bottom side B of D (stretched perpendicular to the focusing direction f) can also be set at a magnetic gap of 205g (indicating the existence At the height Η of the alternating opposing magnets 2 05).

As shown in FIG. 32, the boundary 205b between the N pole and the S pole of the magnet 205 is not only located between the bottom side b and the top side d of the horizontal sides b and d (extending perpendicular to the focusing direction ρ) of the focusing coil 2 0 3 f. In the middle, it also exists on the horizontal sides B and D of the tracking coil 203tu in the upper stage (stretching perpendicular to the focusing direction F) and the bottom side b of the tracking coil 203td in the lower stage (horizontal extensions perpendicular to the focusing direction ρ). D. The center of the magnet 205 is substantially the center of the coil unit 203. The tilt error signal and tracking error signal obtained by using a tilt detection sensor or a regeneration signal using an optical pickup head are input to a control circuit. The control circuit is similar to the control circuit shown in FIG. 29; the control circuit calculates the most reasonable

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556176

The desired current Iιm and Id 'may force the tracking coils 203 tu and 20 3td shown in Fig. 32 to correct both tracking error and tilt error, and then control the circuit to output the current Iu & Id thus calculated. The objective lens driving device is a controlled object that performs tracking servo due to a force, which is the sum of the driving forces (not shown) generated in response to the currents Iu and Id, and this force also moves in the tracking direction T; The driving device also executes tilt servo due to a torque which is generated around the center of gravity of the lens holder 201 due to the difference between the driving forces. In the case where the focusing coil 2 0 3 f is oppressed, due to the current flowing on the horizontal side b (vertical; Figure 3 2 focusing coil f 0 3 f extends in the focusing direction f) (Figure 3 2 φ is indicated by the arrow), The driving force is generated in the focusing direction F in the same direction, so the objective lens 202 can move in the focusing direction ρ according to the surface vibration of the recording medium. In this embodiment, the magnet 205 has a dipole magnetized in the focusing direction F or the tracking direction T. However, without limitation, as shown in FIG. 3, a magnet 205 including two magnet sections can be used. Each of the magnet sections has two poles magnetized in the tracking direction, and is set in the focus direction at the upper and lower stages, respectively. A magnet 205 having quadrupole magnetization is provided. In this case, as shown in FIG. 33, the two tracking coils 203 tu are disposed above and below the magnet 205, in other words, the first and second quadrants of the magnet 205 and the third and second quadrants of the magnet 205 are disposed. The fourth quadrant; let currents with opposite directions flow through the two tracking coils · 20 3 tu. Tracking servo control can be performed due to the following forces, which are the upper and lower forces generated by the two heel coils 2 0 3 1 u The sum of the driving forces Fu and Fd moves in the tracking direction T. As shown in FIG. 34, the two focusing coils 2 0 3 f 1 and 2 0 3 f r are provided on the right and left portions of the magnet 2 05 ′. In other words, they are provided on the magnet 205

C: \ 2D-C0DE \ 91-03 \ 90132195.ptd page 36 556176 V. Description of the invention (34) "-the first and fourth quadrants of the invention, and the magnets 2nd and third quadrants of 2005; Left f right, the streams I 1 and I r are ideally suited for simultaneous correction of focus errors and tilt errors. 'Let the output from the control circuit flow through the two focus coils 203 ", 203fr'. Therefore, focus is performed due to the following forces. Servo control, the force is the sum of the left and right driving forces F1 and F2 generated by the focusing coils 2 0 3 f 1 and 2 0 3 fr, respectively, and the force is moved in the focusing direction F; meanwhile, due to the left and right driving forces The difference between F 丨 and the meter causes a torque centered on the center of gravity G, so tilt servo control is performed. Although it is not shown, 'ideally suitable for simultaneous correction of heel error and tilt error from the control circuit output upper and lower currents Iu ^ Id, let these motors flow through the first and second quadrants of the magnet 2 0 05 and the upper and lower tracking coils 2 0 3 tu, 3 and 4 of the magnet 2 5 and 4 respectively. 2 0 3 td 'The tracking servo control is performed by the following force, which Circles 203tu and 203td generate the sum of the upper and lower forces Fu and Fd, and the force moves in the tracking direction T; at the same time, due to the difference between the upper and lower forces fu and fd, the moment generated around the center of gravity G is performed. Tilt servo control.

Taking the magnet 2 05 having quadrupole magnetization as an example, comparing with a magnet having two pole magnetization, the number of coils is reduced from five to four, so the coils used can be saved. In the case of a magnet 2 05 having a two-pole magnetization, the magnet 2 05 portion provided in the coil driving force generating portion must be disposed outside the magnetic gap 2 05 g (ie, 2 03 Π and 20 3 in FIG. 28). fr b and d sides; 203tu and 203td of Fig. 32). In this respect, a magnet with a quadrupole magnetization of 205 is taken as an example. The opposing portion of the magnet is set outside the magnetic gap of 205 g, so the arrangement of the coil is easy.

m. C: \ 2D-C0DE \ 91-03 \ 90132195.ptd page 37 556176 V. Description of the invention (35) Taking all coils set in the magnetic gap 205g as an example, mutual interaction on both sides often helps Because the driving force is generated, the driving force of the coil can be increased.

In this embodiment, the magnet 205 has two or four poles. However, the magnet 205 can also have three poles magnetization: that is, one pole (such as the S pole) has an I-shaped front side, the other pole (such as the N pole) has a quadrangular front side, and the other two poles are inserted into the other space of the one pole, thus providing The whole has a quadrilateral front magnet. In this case, as shown in FIG. 35, the two tracking coils 20 3tr and 2Q3tl are arranged on the right and left portions of the magnet 2 05, that is, on the blank-shaped sheet portion and on the N pole; Currents flowing in opposite directions flow through the two tracking coils 〇31 r, 20 3 1 1 ′. Therefore, the tracking clothes are executed due to the following force, which is the sum of the upper and lower driving forces Fu and F d and is tied to the heel. Move in direction T. As shown in FIG. 3, the four hydrofocus coils 2 0 3 f 1 and 2 0 3 fr are provided on the right, left, upper, and lower portions of the magnet 205, in other words, above and below the i-shaped flange portion. And set at the N pole; left and right currents 11 and I r (ideally suitable for correcting focus error and tilt error output from the control circuit part at the same time) let the current flow through the two focus coils 203 f 1, 203 fr, so The focus servo control is performed due to the following force, which is the sum of the left and right driving forces F 1 and F r produced by the two focus coils 2 0 3 f 1 and 2 0 3 fr respectively, and the force is in the focus direction ρ movement; and at the same time, tilt servo control is performed due to the following moment, which is generated centered on the center of gravity G via the difference between the left and right forces F 1 and F r. When the magnet 2 0 5 is configured to have three poles magnetization, as shown in Fig. 36, one pole (such as the S pole) has a zigzag front side, and the other two poles (such as the n pole) each have a quadrangular front side and the other two poles. The other space of the one pole is inserted, thereby obtaining a magnet having a quadrilateral front as a whole. In this example, as shown in Figure 36, two = two

556176 V. Description of the invention (36) " 一 '— "' 一 ^ circle 2 0 3 fu, 203 fd are provided on the upper and lower portions of the magnet 2 05, that is, on the imitated-shaped material piece portion and It is set at the N pole to allow the alternating currents to reverse, 'two-one focus coils 2 0 3 fu, 2 0 3 fd, so the focus servo control is performed by the following force, which is the upper and lower driving force F u And ρ d and move in the focusing direction F. As shown in FIG. 36, it is ideally suitable for simultaneously correcting the tracking error and tilt error output from the control circuit section. The upper and lower currents Iu and Id are allowed to flow through the four tracking coils 203tu and 203td. The tracking coils are provided at the right and left portions of the imitated-shaped flange portion and at the N pole, thereby performing tracking servo control due to the following forces; the forces are the upper and lower driving forces Fu and The sum of F d, and the force moves in the tracking direction τ; and at the same time, the tilt servo control is performed due to the following moment, which is caused by the difference between the upper and lower forces Fu and Fd to cause a moment centered on the center of gravity g. In the present embodiment, the 'tilt servo system is performed using a four-focusing coil 2 0 3 f or a four-tracking coil 20 3 tr. However, as shown in Figure 37, when the tilt servo control system is implemented using two focusing coils 2 0 3 f, a magnet with three poles is used: in other words, one pole (such as the S pole) is formed with a τ-shaped front surface, and the other two poles (such as n poles) each have a quadrilateral front face, and the other two poles are inserted into other spaces of the one pole, thus obtaining a magnet having a quadrilateral front face as a whole. In this case, the two tracking coils 2 0 3t 1, 2 03tr are disposed in the middle of the magnet 205, that is, Φ is disposed in the T-shaped vertical portion and the N pole; the two focusing coils 203f 1, 20 3 fr are It is arranged on the left and right parts of the magnet 20 5, that is, on the horizontal part of the imitation τ shape and on the N pole. The left and right currents 11 and r are ideally suitable for simultaneously correcting focus errors and tilt errors from the control circuit section.

C: \ 2D-CODE \ 91-O3 \ 90132195.ptd Page 39 556176 V. Description of the invention (37) Output, let the current 11 and Ir flow through the two focus coils 203 f 1, 203fr. Focus servo control is performed. This force is the sum of the left and right driving forces pi and Fr generated by the two focus coils 203f 1, 203fr, respectively, and the force moves in the focus direction F. At the same time, the tilt servo is performed due to the following torque Control, the moment is a moment centered on the center of gravity G caused by the difference between the left and right forces F 1 and Fr. Taking a magnet with three poles as an example, comparing a magnet with two poles, similar to a magnet with four poles, the coil utilization rate is increased. Regarding the coil unit, whether the magnet has three-pole or four-pole magnetization, similar to a magnet with two-pole magnetization, the coil unit includes a plurality of printed circuit boards of two types stacked upward: that is, one type includes one or more focusing coils 203f mounted on it And another type including one or more tracking coils 203t erected thereon. In addition, the coil unit also includes a plurality of printed circuit boards stacked upward, each of which includes one or more focusing coils 203f and one or more tracking coils 203t mounted thereon. Further, in the third embodiment, a system for performing tilt driving by a control unit having a focusing coil and a tracking coil can be applied to the objective lens driving device according to the second embodiment shown in FIGS. 20 and 21. In addition, in specific embodiments 1 to 3, the objective lens driving device using two, three, or four pole magnetized magnets is described, but the present invention is not limited to this, and a magnet with more pole magnetization can also be applied to the objective lens driving device. As explained in the foregoing, according to a first characteristic aspect of the present invention, an objective lens driving device is provided, in which a coil unit is provided with a focusing coil, a tracking coil, and a tilt coil, and the coil unit is provided including at least one

\\ 312 \ 2d-code \ 91-03 \ 90132195.ptd Page 40 556176 V. Description of the invention (38) The same magnetism of the magnetic circuit of multi-pole magnetized magnet. In this objective lens driving device, the inclination of the objective lens can be adjusted by using the focus driving and tracking driving magnets, and a magnet dedicated to adjusting the inclination of the objective lens can be omitted. Therefore, according to the present invention: the "-feature aspect" can avoid cost increase and prevent the size of the objective lens driving clothes from being increased, otherwise the cost and size may be increased by adjusting the inclination of the objective lens.胩 ΐ H ΐ The second characteristic aspect of the invention is δ, which provides an objective lens driving clothes, and completes two magnetic circuits, each of which includes at least one multi-pole magnetized magnet; a coil is provided inside each magnetic gap of the two magnetic circuits Unit 'σ = the coil unit is provided with a focusing coil, a tracking coil, and a tilt coil; In this objective lens driving device, the inclination of the objective lens can be adjusted by focusing and tracking driving magnets, eliminating the need to set a magnet dedicated to adjusting the inclination of the objective lens. Therefore, according to the second characteristic aspect of the present invention, it is possible to prevent the objective lens driving device from increasing the cost and size of the objective lens by adjusting the inclination of the objective lens. Further, according to a third characteristic aspect of the present invention, an objective lens driving device is provided, in which a coil unit with a plurality of focusing coils and a tracking coil is mounted on the coil unit, and the coil unit is provided in a magnetic circuit (including At least one multi-pole magnetized magnet) inside the same magnetic gap, the current is applied to the multiple focus coils included in the coil unit, so the sum of the driving forces generated in response to the supply current can perform the focusing service, and because The difference in driving force generates a moment centered on the center of gravity of the moving part, thereby focusing on adjusting the tilt of the objective lens at the same time. In this objective lens-driven clothing, the use of right and left focus coils ’can not only perform focusing feeding, but also

C: \ 2D-CODE \ 91-03 \ 90132195.ptd Page 41

556176 V. Description of the invention (39) The tilt of the objective lens can also be adjusted, which obviates the need to set a dedicated, inclined coil and magnet. Therefore, according to the present invention, the specific embodiment 3 of the 25 f element lens tilt can prevent the increase in the cost and the size of the objective lens driving device by adjusting the inclination of the objective lens. Explanation of component numbers

1 Lens holder la Notch part lb Receiver objective mounting part 3 Coil unit 3f Focusing coil 3ti Tilt coil 3tr Tracking coil 3v V-groove 5 Magnet 5b Boundary 5g Magnetic gap 6 Car base 7 Light 8 Wire base 9 Base plate 31 Printed circuit board 32 Printed circuit board 101 Lens holder 102 Objective lens

42nd tribute 556176 V. Description of the invention (40) 103 Coil unit 103f Focusing coil 103ti Tilt coil 1 0 3 tr Tracking coil 104 Conductive elastic member 105 Magnet 105b Boundary line 1 05g Magnetic gap 106 Yoke base 107 轾 108 Wire base 109 Substrate 111 slot 112 support block 113 coil winding frame 130f focus coil 130ti tilt coil 130tr tracking coil 131 printed circuit board 132 printed circuit board 201 lens holder, holder 201a concave π section 202 receiving objective lens 203 coil unit «

C: \ 2D-CODE \ 91-03 \ 90132195.ptd Page 43 556176 V. Description of the invention (41) 2 0 3 fl Focusing coil 2 0 3 fr Focusing coil 2 0 3h Solder 2 0 3p Printed circuit board 2 0 3 t With longitudinal coil 2 0 3v V-shaped groove 204 Conductive elastic member 205 Magnet 2 0 5b Boundary line 2 0 5g Magnetic gap 206 Cheer base 207 Yoke 208 Lead base 209 Substrate 1100 Optical disc 1101 Lens holder 1103 Objective lens 1104 Flat coil 1105 coil 1106 magnet member 1107 magnet member 1108 actuator base 1109 yoke member 1110 yoke portion Φ

C: \ 2D-CODE \ 91-03 \ 90132195.ptd Page 44 556176 V. Description of the invention (42) 1111 Magnet 1112 Magnet 1113 Car 1114 Car 1115 Copper foil part 1116 Copper pig part 1117 Square printed circuit board 1118 Square printed circuit Plate 1119 Copper foil section 1120 Copper foil section 1121 Spring wire 1201 Primary light 1202 Primary light 1301 Optical sensor 1302 Optical sensor 1403 Difference amplifier 1404 Preset section 1405 Phase compensation circuit 1406 Drive amplifier 1407 Amplifier 1408 Amplifier B Magnetic field line F Focus axis Η Height «Β · C: \ 2D-CODE \ 91-03 \ 90132195.ptd Page 45 556176 V. Description of the invention (43)

R T W Tracking axis Disc tangent axis Width lilii C: \ 2D-CODE \ 91-03 \ 90132195.ptd Page 46 556176

The figure is a simple illustration of an exploded perspective view of Example 1 of an objective lens driving body used in the optical pickup head of the present invention; Pei Zhizhi Figure 2 is a magnetic circuit used in a specific embodiment 1 of the present invention. 3 is a configuration view of a specific embodiment 丨, which is displayed in the poly-view = view, 5 the self-weighted position of embodiment 1, the position relationship between the magnet and the focus coil; 绫, the positional relationship between the tracking coils; The configuration view is displayed in the eight-way, universal, and self-weighted position of Example 1. The relationship between the position of the magnet and the tilt coil is shown in Figure 5. Figure 5 is a modified example of the specific embodiment 1. The direction is at the self-weighted position of the specific embodiment 1. The position between the magnet and the tilt coil is related; FIG. 6 is a plan view of a magnetic circuit used in the modified example of the specific embodiment 1; FIG. 7 is a modification of the specific embodiment 丨The arrangement view of the example is shown in the focusing direction. At the self-weighting position of the specific embodiment 1, the positional relationship between the magnet and the focus coil / longitudinal coil is shown in FIG. 8. FIG. 8 shows a modified example of the coil unit of the specific embodiment 1. FIG. 9 is Concrete An exploded perspective view of another modification of Example 1; FIG. 10 is a plan view of a magnetic circuit used in the objective lens driving device shown in FIG. 9; FIG. 11 is a configuration diagram showing another embodiment according to the specific embodiment 1 of the present invention 'The positional relationship between the focus direction and the weight position of this embodiment is between the four-pole magnetized magnet and the tracking coil; Figure 12 is a configuration diagram showing the focus side according to the embodiment shown in Figure 丨 丨

\\ 312 \ 2d-code \ 91-03 \ 90132195.ptd Page 47 556176 The diagram briefly explains the direction, the position between the book and the focus coil in this embodiment. Figure 13 is the layout diagram, showing the direction, in this implementation The bitmap between the iron and the tilt coil of the example is a layout diagram, showing the embodiment, the magnet with three poles in the focus direction and the concentric circle 15 is the layout diagram, showing the example, the magnet with the three poles in the focus direction and the tilt diagram. 16 is a configuration diagram showing an example of a three-pole magnetized magnet in a focusing direction and a focusing figure 17 is a layout diagram showing an example of a three-pole magnet and a tilt in a focusing direction. FIG. 18 is a configuration diagram showing an implementation For example, the relationship between magnets with two poles in the focusing direction and the focusing relationship; Figure 19 is a layout diagram showing the embodiment, the relationship between the magnets with two poles in the focusing direction and the weighting position of the focusing is between the magnets with four poles magnetizing; The embodiment shown in Figs. 11 and 12 is located between the focus position of the focus itself and the magnetic position relationship with quadrupole magnetization; it shows the other weight position of the embodiment according to the specific embodiment 1 of the present invention, which is between focus. Position between coils / tracking coils Shows the position of other weights of this embodiment according to the specific embodiment 1 of the present invention, and the positional relationship between the oblique coils; shows the weight of the other of this embodiment according to the specific embodiments of the present invention Position, the positional relationship between the focal coil / tracking coil; shows the positional relationship between the oblique coils and other weighted positions according to the specific embodiment 1 of the present invention; shows the positional relationship between the oblique coils according to the present invention; The other specific weight positions of the specific embodiment 1 are the positions between the focus coil / tracking coil / tilt coil shown in this embodiment, and the other weight positions of this embodiment according to the specific embodiment 1 of the present invention. Between focus coil / tracking coil / tilt coil

\\ 312 \ 2d-code \ 91-03 \ 90132195.ptd Page 48 556176 The relationship is briefly illustrated in FIG. 20; FIG. 20 is an exploded perspective view of Embodiment 2 of the objective lens driving device for the optical pickup head of the present invention FIG. 21 is an exploded perspective view of a modified example of the specific embodiment 2; FIGS. 2A and 22B are plan views of a magnetic circuit used for the objective lens driving device shown in FIG. 9; and FIG. 23 is another of the specific embodiment 2 An exploded perspective view of the modification; FIG. 24 is a front view of the objective lens driving device shown in FIG. 23; FIG. 25 is a configuration diagram of a modification of the specific embodiment 2 shown in FIG. The position of the self-weighting of the second embodiment, the positional relationship between the magnet and the longitudinal coil / tilt coil; FIG. 26 is a configuration diagram of a modified example of the specific embodiment 2 shown in FIG. 23, which is shown in the focus direction. The position of the self-weighting of 2, the positional relationship between the magnet and the longitudinal coil / tilt coil; Fig. 27 is an exploded perspective view of Embodiment 3 of the objective lens driving device for the optical pickup head of the present invention; This is a configuration diagram of the specific embodiment 3, shown on the focus side In the self-weighted position of the specific embodiment 3, the positional relationship between the magnet and the focus coil / tracking line gate is shown in FIG. 29. FIG. 29 is a block diagram of the focus servo and tilt circuit configuration for the specific embodiment 3 of the present invention; It is an explanatory diagram of the focus servo and the tilt drive performed in the specific embodiment 3. In particular, FIG. 30A shows a case of generating a driving force in the same direction; FIG. 30B shows a case of generating a driving force in the opposite direction; M /,

556176 Brief description of the drawings. Figure 31 is an exploded perspective view of the modified example of the specific embodiment 3. Figure 32 is a configuration diagram of the modified example of the specific embodiment 3, which is displayed in the focus direction and the self-defense of the modified example; r $ „position 'The positional relationship between the magnet and the focus coil / longitudinal coil; _ Fig. 3 3 is also used in the present invention j. * Ridge # y, 0 ^ Zanyue's first master to pick the objective lens drive device Another example of Example 3 · Example of the evening lion class π —ν 丨 ,, the layout diagram is shown in the focus direction at the actual weight position of this example plus the position relationship between the public shells; " in a magnet with quadrupole magnetization Fig. 34 with the tracking coil is the configuration diagram of the embodiment shown in Fig. 3 + + + +, and it is shown in the focus direction at the weight position of the present embodiment, a # 丄 ^ m The positional relationship between the magnet with quadrupole magnetization and the poly-spirited soul circle; Guan-, dwelling, line Figure 3 5 is a pre-pick 5 for another embodiment of the photoacoustic embodiment 3 of the present invention The weighting position of the specific embodiment of the objective lens driving device, refer to the right / right, and focus on the actual / tracking direction. The positional relationship between the circles; Tiexing Focus Focal Coil is displayed on the polypolar magnetization, and is shown in the configuration diagram of another embodiment of the embodiment. The weight position of the embodiment is somewhere between iron / focusing coil / tracking Positions between coils; Figure 37 is another of the specific embodiment 3-the focusing direction is the weight position i of this embodiment, which is located in the map, showing the positional relationship between the poly iron and the focusing coil / tracking coil; The magnetic picture with two poles magnetization 38 is an exploded view of the conventional objective lens driving device. Figure 39 is an illustration of the conventional objective lens driving diagram. The driver's oblique correction driving operation is provided.

556176

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Claims (1)

556176 6. Scope of patent application An objective lens driving device for an optical pickup head includes a magnetic circuit including a magnet magnetized with at least three poles; and a coil unit including a focusing coil, a tracking coil, and An oblique order is in which the focusing coil, the tracking coil and the oblique coil are arranged inside the magnetic gap of the magnetic circuit. 2. The objective lens driving device according to item 1 of the patent application scope, wherein the magnet is magnetized with four poles. 3. The objective lens driving device according to item 1 of the patent application scope, wherein the magnet is magnetized with three poles. 4. If the objective lens driving device according to item 1 of the patent application scope, wherein the number of the focusing coils is two, the number of the tracking coils is two, and the number of the tilt coils is two, wherein the magnet includes two magnet sections each of which The magnets are arranged in two stages above and below the focusing direction, and each magnet segment is magnetized in two directions in the tracking direction, whereby the magnet has quadrupole magnetization. 5 · If the objective lens driving device of the scope of patent application, The number of the focusing coils is 4, the number of the tracking coils is 2, and the number of the tilt coils is 4, wherein one pole of the magnet has an I-shaped front surface, and the other two poles each having a quadrangular front surface are inserted into the one pole. Other space, the magnet as a whole has a quadrangular front face and has a three-pole magnetization. 6 · If the objective lens driving device of the scope of patent application, 556176 Shen Jing's patent scope The number of tilting coils ;, = 4 turns, the number is 2 'The number of heel coils is 4, and where' The magnet is-to be a female a ^ The other two poles on the front of the rectangle are optional The sub-shaped front side, and other spaces each having four poles, and the dead poles are inserted into one pole of the side, so the magnetic front: ί: the side of the front side has three poles magnetization. In a, take: the objective lens driving device of the range item 1, the number of the inclined lines is 2 'the tracking line, the number of turns is 2, and wherein' one pole of the magnet has a τ polygonal front side in addition _ # 在There is a τ sub-shaped front surface, and each has four irons and the whole has four ";: =: the other space of the one pole, so the magnetic sa is also shaped from 4 and has a three-pole magnetization. The magnetic circuit of the item in the scope of the application of the patent of μ includes a multi-blade mirror driving device, in which the formed magnetic gap; the root magnet 'and the coil unit are provided by the magnet coil unit including the m: 1 connection. The objective lens driving device, wherein the circle and the tilting coil system are respectively arranged in the printed circuit = focal line, tracking line 20, such as the V! Patent scope of the first objective lens driving device, f, and the tilting coil system. On the second printed electrical printed circuit board 'II: Shen? ”Ϊ́ΐThe objective lens driving device of item 1, wherein,“ Hai, Quan Quan early includes multiple printed circuit boards and the focusing coil and tilting coil system-: η board, ι% ”豕 First A printed circuit board C: \ 2D-C0DE \ 91-03 \ 90132195.ptd 556176 6. Application scope " 上 'and the tracking coil are arranged on the second printed circuit board. 1 2 · An objective lens driving device for an optical pickup head, the device includes: v = magnetic, each of which includes a magnet magnetized with at least three poles; and a coil unit, which includes a focusing coil, a tracking A coil and a tilt coil, wherein the focusing coil, the tracking coil and the tilt coil are arranged inside the magnetic gap of the magnetic circuit. 1 3. The objective lens driving device according to item 12 of the patent application scope, wherein the magnet is magnetized with four poles. φ 1 4 · The objective lens driving device according to item 12 of the patent application scope, wherein the magnet is magnetized with three poles. 15. If the objective lens driving device according to item 2 of the patent application scope, wherein the number of the focusing coils is two, the number of the tracking coils is two, and the number of the tilting coils is two, and the magnet includes two magnet sections, the Each of the magnets is arranged in two stages above and below the focusing direction, and each magnet segment is magnetized in two directions in the tracking direction, whereby the magnet has quadrupole magnetization. 16. If the objective lens driving device according to item 2 of the patent application scope, wherein 'the number of the focusing coils is 4, the number of the tracking coils is 2, and the number of the tilt coils is 4, ψ, wherein one of the magnets has The I-shaped front surface and the other two poles each having a quadrangular front surface are inserted into the other space of the one pole, so the magnet as a whole has a quadrangular front surface and has three-pole magnetization. 1 7 · If the objective lens driving device of item 丨 2 of the patent application scope, 556176 6. The scope of patent application ^ Among them, the number of focusing coils is 2, the number of tracking coils is 4, and the number of tilting coils is 4, where 'one of the magnets has a zigzag front side, and each has a quad-k shape. The other two poles on the front side are inserted into the other space of the one pole, so the magnet as a whole has a quadrangular front side and has three pole magnetization. 1 8 · If the objective lens driving device according to item 2 of the patent application scope, wherein the number of the focusing coils is two, the number of tracking coils is two, and the number of the tilting coils is four, wherein one pole of the magnet has T The zigzag front side and the other two poles each having a quadrangular front side are inserted into the other space of the one pole, so the magnet body has a quadrangular front side and has three pole magnetization. 19 · The objective lens driving device according to item 2 of the patent application scope, wherein the magnetic circuit includes a plurality of magnets, and the coil unit is disposed inside a magnetic gap formed by the magnet. 2 ◦ If the objective lens driving device according to item 12 of the patent application scope, the coil unit includes a plurality of printed circuit boards, and the focus coil, tracking coil, and tilt coil are respectively disposed on the printed circuit board. 2 1 · The objective lens driving device according to item 12 of the patent application scope, wherein the coil unit includes a plurality of first printed circuit boards and a second printed circuit board, and the focusing coil and the tracking coil are disposed on the first The printed circuit board and the oblique coil are arranged on the second printed circuit board. 2 2 · The objective lens driving device according to item 12 of the patent application scope, wherein the coil unit includes a plurality of first printed circuit boards and a second printed circuit board, and the focus coil and the tilt coil are disposed on the first A printed circuit board C: \ 2D-C0DE \ 91-03 \ 90132195.ptd Page 55 556176 The upper and tracking coils are disposed on a second printed circuit board. An objective lens driving device according to item 12 of the patent, wherein an early element is an objective lens driving device for an optical pickup, which is fixed to a lens holder that extends parallel to the tracking direction. The inclination of the disc Θ2, which adjusts the inclination of the object j according to the inclination signal of the disc, the device includes: an it road, which includes a magnet magnetized at least three poles; and # _ _ 其, which It includes a focusing coil, a tracking coil, and a tilting magnetic iδHi focusing coil. The tracking coil and the tilting coil are arranged inside the magnetic gap of the magnetic circuit. The sum of the driving forces performs focus servo by dividing i = the current supplied by the solid focus coil, and the center force = t ff. The difference in force forces is performed by using the center of gravity of the moving part as the moment to perform tilt adjustment of the objective lens. Xi = · The second claim is for the objective lens driving device of the scope of patent No. 24, in which the 忒 magnet is quadrupole magnetized. The current 2m patent & 24th objective lens driving device in which the 5A magnet is magnetized by three poles. 27. If the objective lens driving device of item 24 of the patent application scope, the number is 2 'and the number of the longitudinal coils is 2, direction: iron section, which is respectively arranged on the focusing side and the next dagger section, and each magnet The segment is at the pole of the tracking direction 556176 6. Scope of Patent Application Magnetization 'This magnet has quadrupole magnetization. Basin stated that the objective lens driving device of the 24th range of the profit and profit range, the number of y, middle ° H | focus coils is 4, and the number of tracking coils is 2, true, one of the magnets has a 丨 shaped front, and The other two poles each having a quadrilateral front face are inserted into the other space of the one pole, whereby the magnet as a whole has a quadrangular front face and three-pole magnetization. 29. For example, the objective lens driving device of item 24 of Shenyan's patent scope, "in the number of focusing coils of 2 is 2" and the number of longitudinal coils is 2 of which, "one of the magnets has a T-shaped front surface, And the other two poles each having a quadrangular front face are inserted into other spaces of the one pole, whereby the magnet as a whole has a quadrangular front face and has a three-pole magnetization. 30. The objective lens driving device according to claim 24, wherein the magnetic circuit includes a plurality of magnets, and the coil unit is disposed inside a magnetic gap formed by the magnets. 3 1 · As described in claim 24 of the patent scope, the objective lens driving device, wherein the coil unit includes a plurality of printed circuit boards, and the focusing coil and the tracking coil are respectively disposed on the printed circuit boards. 1 3 2. The objective lens driving device according to item 24 of the patent application, wherein the coil violation unit includes a printed circuit board, and the focusing coil and the tracking coil are mounted on the printed circuit board. 3 3 · —An objective lens driving device for an optical pickup head, which is used to detect the inclination of the optical disc, and to adjust the inclination of the objective lens according to the inclination signal of the optical disc. The device includes: a magnetic circuit, It includes a magnet that is magnetized at least three poles; and C: \ 2D-CODE \ 91-03 \ 90132195.ptd Page 57 556176 6. Scope of patent application " " 一 " ', ", spring coil unit' which includes a focus coil, a longitudinal coil And a tilting coil, where the focusing coil, the tracking coil, and the tilting coil are disposed inside the magnetic gap of the magnetic circuit; A plurality of focusing coils are supplied with current to perform a tracking servo, in which the tilt adjustment of the objective lens is performed due to a difference in driving force by generating a torque centered on the center of gravity of the moving part. 3 4 · The objective lens driving device according to item 33 of the patent application scope, wherein the magnet is quadrupole magnetized. 35. The objective lens driving device according to item 33 of the patent application scope, wherein the magnet is three-pole magnetized. 36. If the objective lens driving device of item 33 of the patent application scope, wherein the number of the focusing coils is two and the number of the tracking coils is two, where the magnet includes two magnet sections, which are respectively arranged in the focusing direction. The upper and lower two stages, as well as the two-pole magnetization of each magnet section in the tracking direction, whereby the magnet has four-pole magnetization. 37. The objective lens driving device according to item 33 of the patent application, wherein the number of the focusing coils is two and the number of the tracking coils is four, wherein one pole of the magnet has a zigzag front side, and each has a quadrangular front side. In addition, the two poles are inserted into the other space of the one pole, whereby the magnet as a whole has a quadrilateral front surface and has three pole magnetization. 38. The objective lens driving device according to item 33 of the scope of patent application, wherein the magnetic circuit includes a plurality of magnets, and the coil unit is provided by the C: \ 2D-CODH \ 91-03 \ 90132195.ptd page 58 556176, patent application scope, etc. The inside of the magnetic gap formed by the magnet. Xi / · The object lens driving device of item No. 33 in the scope of the patent application, where the unit includes multiple printed circuit boards, and the focusing coil and tracking, and the “7 U” is installed on these printed circuit boards. . 4 / · If the objective lens driving device according to item 33 of the patent application scope, wherein the unit includes a printed circuit board, the focusing coil and the heel & bezel are mounted on the printed circuit board. An objective lens driving device for an optical pickup head. The device is based on the inclination of the optical disc and the inclination of the optical disc according to the inclination signal of the optical disc. The device includes: a magnetic circuit Each of them includes a magnet magnetized at least three poles; and a coil unit including a focusing coil, a tracking coil, and a tilt coil, wherein 'the focusing coil, the tracking coil, and the tilt coil are arranged in a magnetic circuit. Inside the magnetic gap, where 'the focus servo is performed by supplying current to a plurality of focus coils due to the sum of driving forces generated by most of the focus coils, Among them, the tilt adjustment of the objective lens is performed due to the difference in driving force by generating a torque centered on the center of gravity of the moving part. > 4 2 · The objective lens driving device according to claim 41, wherein the magnet is quadrupole magnetized. 4 3 · The objective lens driving device according to item 41 of the patent application scope, wherein the δ xuan magnet is tripolar magnetized. 556176 44. For example, the objective lens driving device according to item 41 of the patent application scope, wherein the number of the focusing coils is two and the number of the tracking coils is two, wherein 'the magnet includes two magnet sections which are respectively arranged in the focusing direction. The upper and lower stages, and the two-pole magnetization of each magnet segment in the tracking direction, whereby the magnet has four-pole magnetization. 4 5 · If the objective lens driving device according to item 41 of the patent application scope, wherein the number of the focusing coils is 4 and the number of the tracking coils is 2, wherein one pole of the magnet has an I-shaped front surface and each has a quadrangular front surface The other two poles are inserted into the other space of the one pole, whereby the magnet as a whole has a quadrilateral front surface and has three pole magnetization. 46. If the objective lens driving device of the scope of patent application No. 41, "wherein the number of the focusing coils is two and the number of the tracking coils is two, where one of the magnets has a T-shaped front surface, and each has a quadrangular front surface The other two poles are inserted into the other space of the one pole, whereby the magnet as a whole has a quadrilateral front surface and has three pole magnetization. 47. The objective lens driving device according to claim 41, wherein the β magnetic circuit includes a plurality of magnets' and the coil unit is disposed inside a magnetic gap formed by the magnets. 48. If the objective lens driving device according to item 41 of the patent application scope, wherein the coil unit το includes a plurality of printed circuit boards, and the focusing coil and the tracking coil are respectively provided on the printed circuit boards. 4 9 · The objective lens driving device according to item 41 of the patent application, wherein the coil unit 7C includes a printed circuit board, and the focusing coil and the tracking coil are mounted on the printed circuit board. \\ 312 \ 2d-code \ 91-03 \ 90132195.ptd Page 6〇 ^ 6176 / 、 Application scope is for an objective lens driving device for optical pickup head, this device # 物 浐 1,倾斜 The inclination of the optical disc, and the inclination of the disc is adjusted according to the inclination signal of the optical disc. The device includes ... and a magnetic circuit, each of which includes a magnet magnetized at least three poles; and a coil coil unit, which includes a focusing coil A tracking coil and a tilting coil, the focusing coil, the tracking coil, and the tilting coil are arranged inside the magnetic gap of the flexible pen circuit, not to mention, because of the sum of the driving generated by most tracking coils, The focus servo is supplied with current to perform tracking servo, Φ2 is from the other side; the difference in driving force is performed to adjust the tilt of the objective lens by generating a torque centered on the center of gravity of the moving part. Xi 丄: The application of the objective lens driving device of the 50th item of the patent application of Shenhu, among them,. Lair magnets are based on quadrupole magnetization. 52. For example, the objective lens driving device of the scope of application for patent No. 50, wherein the demagnetizing magnet is tripolar magnetized. 53. For example, the objective lens driving device of scope 50 of the patent application scope, the number of small focus coils is 2, and the number of tracking coils is 2, /, and the magnet includes two magnet areas, which are respectively arranged. At the focus side, the upper and lower stages, and the two-pole magnetization of each magnet segment in the tracking direction, whereby the magnet has four-pole magnetization. 54. For example, the objective lens driving device of scope 50 of the patent application, wherein 'the number of the focusing coils is 2' and the number of the heel coils are 4, mi C: \ 2D-CODE \ 91-03 \ 90132195.ptd Page 61, 556176 6. The scope of the patent application. Among them, one pole of the magnet has a Η-shaped front side, and the other two poles each having a ^ quadrangular front side are other spaces into which the one pole is inserted. Three-pole magnetization. 5 5 · According to the objective lens driving device No. 50 of the patent application scope, wherein the magnetic circuit includes a plurality of magnets, and the coil unit is disposed inside a magnetic gap formed by the magnets. 56. For example, the objective lens driving device of claim 50 in the patent scope, wherein the coil unit includes a multi-month printed circuit board, and the coils are respectively disposed on the printed circuit boards. ° 4 ", coil and tracking 57. If the coil unit of the patent application No. 50 is included, the coil unit includes one month such as a mirror driving device, Gansu ◦ Heyue printed circuit board. The eD w U and the 隹 妗 ΠΠ 4 printed circuit boards. The focus coil and the WC: \ 2D-CODE \ 91-03 \ 90132195.ptd page 62