TW584846B - Pickup head actuator - Google Patents

Abstract

A pickup head actuator is disclosed, which can be mounted with an access device of near-field optics, an access lens of far-field optics or a magnetic access device. In addition to proceeding focusing and tracking servo, the base can also be suspended at different depths under the normal state by using the attraction of the magnetic sensing device and tracking magnet, thereby adapting to the operation heights of various access devices to solve the problem of compatibility.

Description

584846 V. Description of the invention (1) [Field of the invention] The present invention is a read / write head actuator, which is used to carry a plurality of near-field optical or magnetic access elements, especially a read that can provide different working heights. Write head actuator. [Background of the Invention] Magnetic recording and optical recording are widely used in data storage. As far as magnetic recording is concerned, there are common floppy disks and hard disks, which use magnetic heads to fly less than 1 # m away from the disks. High access to data; 5 'optical recordings are currently known as compact discs (CDs), digital versatile discs (DVDs), and magneto-optical discs (magneto) optical disc; M0) are commonly used optical storage media. Generally, these optical media are stored using a numerical aperture (N · Α ·) objective lens to focus the laser beam on the disc, and the objective lens The distance to the disc (the so-called working height) is much larger than the wavelength of the laser light, which is generally called the far-field optical recording medium. With the advancement of technology, in order to achieve higher density data storage, the design of near field optics recording data has gradually appeared. For example, there are solid-state immersion lenses (sol id imme: rsion) lens, SIL), solid immersion mirror (SIM), and vertical cavity surface emitting laser (VCSEL), etc. are mainly based on flying heads within 100 nm. Highly documented. Although the near-field optical recording method can greatly increase the density of data storage, it is not compatible with the far-field optical recorder, resulting in additional consumer

4 584846

V. Description of the invention (3) | Maximum I and magnetic recording media for a single read-write head. It is compatible with the optical near-field and far-field support shafts disclosed in the present invention, a focusing single-bay write head actuator, including a base, and a data access element. Holding unit, the base can be used to move at least two vehicles perpendicular to the recording medium on the support shaft, which can be moved relative to the support, and the focusing unit includes a pick-up, which is relatively rotated on the base with the axis of the support shaft as the axis It is located on the support 5 and focus coil. The focus coil is installed in the field. After the focus coil is energized and excited, the outer side is equipped with a focus magnet. Contain; own; media move. Iron, compliance coils are installed in :::: combination coils and two compliance magnets-combined for one of the ~~ /, one of the compliance magnets: cooperating with the tracking magnets to borrow simultaneously Feed by the line | Pieces still feed. From m, it can be swung at a small angle for data access. In order to further advance I sound agency — ylang province drive energy and your field 4 丨 = different working height of the storage element, and provide I cattle can be fork to track The attraction energy of the iron is often τ /, to ^ — a magnetic induction 丨 ί: the energy required when moving, the same; holding in suspension-like another-aspect 'can also be transferred to the suspension height of the two magnetic sensing elements ^: = ; 丨 to make the ... write head to obtain the best compatibility: not page 6 4 584846 V. Description of the invention (4) In order to further understand the purpose, structural features and functions of the present invention, the detailed description is given in conjunction with the drawings [Detailed description of the embodiments] The read-write head actuator disclosed in the present invention mainly provides a read-write head actuator that can change its working height according to the active focal length of different data access components. Say, please refer to "Figures 2A and 2B". The base 20 has a far-field read / write head 1 and a near-field read / write head 2. When the far-field read / write head 1 is used, the base 20 is far away. The height of the field disc 1 3 is h 1, and when the near-field read / write head 2 is used, the base 20 is spaced from the near-field disc 1 4 The degree is h 2 and h 2 is less than h 1, so that when the far-field read-write head 1 is used, even if the far-field disc 1 3 shakes considerably, it will not damage the near-field read-write head 2. The detailed structure and operation of the invention are described in detail below. As shown in "Figure 3", the head actuator includes a base 20, a supporting unit 3, a focusing unit, and a tracking unit. The base 20 has a position for installing two data access components. Of course, in order to improve its compatibility, it is better to install a far-field read / write head 1 and a near-field read / write head 2, which can be preset numerical aperture objectives, solid-state immersion lenses, magnetic heads, holographic lasers, Any combination of solid-state immersion mirrors and vertical cavity surface-emitting lasers, and the base 20 is mounted on the support shaft 31 and can be rotated relative to the support shaft 31 or along the long axis of the support shaft 31 Direction movement. The focusing unit includes a focusing coil 27 and a focusing magnet 3 4 and 3 4 ′. Please refer to “FIG. 5”. The focusing coil 27 is mounted on the base 20 and supports the periphery of the shaft 31 to focus. Focusing magnets 3 4 and 3 4 ′ are provided on the outside of the coil 2 7. At the same time, the focusing magnets 3 4 and 3 4 ′ face the focusing coil 2 7 with the same polarity.

584846 V. Description of the invention (5) The focusing coil 27 can be used to generate electromagnetic force after being energized and interact with the focusing magnets 34 and 34 '(can be mutually exclusive or mutually attracting). A small movement in the direction of the long axis (see Figure 6), which produces a focusing effect. The focusing magnets 34 and 34 may be arranged on the support shaft 31.

Arcs or columns that are symmetrical to each other on both sides, such as "Figure 7A, 7B". The tracking unit basically has two functions, the first is the tracking servo and the second is the rotating base for switching different data access components. The tracking list contains the tracking coils 2 2, 2 2, and 2 3 , 2 3, and tracking magnets 3 2, 32, 33, 33 ', compliance coils 22, 22, 23, 23' are placed around the base 'and compliance coils 2 2, 22, and tracking Coils 2 3, 2 3, points 2 are symmetrical to each other, and the obedient magnets 32, 32 ,, M, M, 3 2, and Pan / 1 line, coil, 22, 22 ', 23, 2 3, Outside, and the follower magnet 32 is placed symmetrically with the taxi magnets 33, 33 ', and 23 ^ turns 2 2, 2 2, # + ... 3 3, 3 3, that is, if the follower | When the coils 23, 2 f should be at the positions of the tracking magnets 32, 32 ,, the tracking coils 23, 2 correspond to the tracking magnets 33, 33, and vice versa. At positions 33, 33 ,, as shown in "Γ8", the positions ϋ and 2 are changed. I9 j ^ ^ 1 ^ # ^ ^ Λ & The swing is located at the base 2 with the support axis 31 as the axis Make a small near-field read / write head 2 or a far field 584846 Explanation (6) The read head 1 can follow the servo. At the same time, it can use a large current passing through the follower coils 22, 22 ', 23, 23' to generate a large electromagnetic force and get rid of this time. Corresponding to the constraints of the tracking magnets 3 2, 3 2 ', 3 3, 3 3', and switch to another group of tracking coils 2 2, 2 2 ', 2 3, 2 3' and another group of tracking coils The magnets 3 2, 3 2 ', 3 3, 3 3' correspond to each other, please refer to "Figures 3 and 4", and switch to the first position and the second position for the near-field read-write head 2 or the far-field read and write The first 1 works. Regardless of which head is working at this time, the tracking unit can also be used to track the servo, the focusing unit to focus, or the tracking unit can be used to switch to another head. On the other hand, after the current is passed through the focusing coil 27, the focus magnets 3 4, 3 4 ′ are applied to make the base 20 in a floating state (or relative to the disc) relative to the magnet base 36. Therefore, Different working heights can be provided by this suspended balance position, but because of this design, a large current must be passed to the focus coil 27 every time to drive to overcome the base 20 and read and write The weight of the heads 1 and 2 makes it suspended in order to start operation, so it consumes considerable energy. Therefore, it is designed to have a magnetically sensitive element 25, 25 ', 26, 26' behind each of the non-compliant coils 2, 2, 22 ', 23, and 23', such as ferroalloys and other magnetically attractive elements. Coil 2 7 or tracking coil 2 2, 2 2 ′, 2 3, 2 3 ′ No current is applied, and the magnetic sensing element 2 5, 2 5 ′, 2 6, 2 6 ′ may still be subjected to the tracking magnet 3 2, 3 2 ', 3 3, 3 3', to maintain the base 20 in a suspended state; by the installation height of the tracking magnets 32, 32 'and 33, 33' of different groups (see Figure 9A) and Has a height difference Ah, or a difference in size (see Figures 9B, 9C) and a size difference ΔL, which makes the magnetic sensing elements 25, 25 ', 26, 26' attracted and

Page 9 584846 V. Description of the invention (7) When maintained in a suspended state, there will be a gap between different positions. For example, taking "Figure 9A" as an example, when the head actuator is in the first position, that is, the compliance coil 2 2, 2 2 'corresponds to the compliance magnet 3 2, 3 2', the base The suspension height of 20 is roughly at the center of the tracking magnet 3 2, 3 2 '; and when the head actuator is in the second position, the compliance coil 2 3, 2 3' corresponds to the tracking magnet 3 3, 3 3 ', the height of the suspension of the base 20 is roughly the center of the follower magnet 3 3, 3 3'. However, since the installation height of the non-compliant magnets 3 2, 3 2 ′ and the non-compliant magnets 3 3, 3 3 ′ has a height difference Δ h, the bases 20 of the first position and the second position after balancing are relative to the magnets. The seat 36 also has a Δh gap, that is, the base 20, or the far-field read / write head 1 and the near-field read / write head 2 have different working heights (see Figures 2A and 2B). In addition, the height difference Δϊι of the magnetic sensing elements 25 and 26 (see Figure 10) can also be used to match the tracking magnets 3 2, 3 2 ', 3 3 and 3 3' with the same height and size. Working height. The number of tracking coils and tracking magnets does not necessarily need to cooperate with each other. As in the second embodiment of the present invention, a set of tracking coils 2 2 and 2 2 are used to correspond to two sets of tracking magnets 3 2 and 3 2 ', 3 3, 3 3' (see Fig. 1 A), or as in the third embodiment of the present invention, two tracking coils 2 2, 2 3 correspond to two tracking magnets 3 2, 3 3 (see Figure ΠB), or as the fourth embodiment of the present invention, using a compliance coil 2 2 corresponding to two compliance magnets 3 2, 3 3 (see Figure 1 1C), also have The same effect. In order to cooperate with the magneto-optical media data, a magnetic field generator can be added to the far-field read / write head 1 or the near-field read / write head 2 such as the magnetized coil 5 1 (see FIG. 12B) or an external magnetic field source. 52 (see Figure 12A), which makes

Page 10 584846 V. Description of the invention (8) The far-field read / write head 1 can access magneto-optical media data. At the same time, the near-field reading head 2 can be mounted on the base 20 with an elastic body 41, so that the near-field reading " fetching head 2 is actuated, even if the near-field disc j 4 is vibrated and pressed Take ^, at 2 o'clock, you can also use the elastic body 41 to swing with respect to the base 2 {) 1 disc 14 'but it does not affect the base-it can greatly improve the effect achieved' Coil, magnetic element; ^^^ :: Yu uses tracking magnets and tracking two, and puts them in different positions :: == "material access elements to pick up elements" such as optical near-field access elements: orientation, to adapt to various f access elements, and can read far-field access elements with some storage media and storage media in the near future ′, and the master write head can obtain the greatest compatibility: the design of photon storage media, not for the office The presenter is merely a preferred embodiment of the present invention, which limits the scope of implementation of the present invention 7, which is the preferred embodiment of the present invention. The same changes and modifications are made, and all of the patent applications in accordance with the present invention, Covered by patents.

¥ 11 κ 584846 Schematic description of the drawing is shown in the drawing. B 2 is the head of the figure shown in Figure A. 12 Read the figure shown in the figure. The figure is shown in the set position. The book is shown in Figure 3 and Figure 4. The picture is shown in the side focus. The book is shown in Figure 5. The book is shown in Figure 5 6 and the picture is shown. Magnetic JUU "隹: Jumingfa is a picture of the ferromagnetic observance of the picture, and the picture sounds ^ • 'The illustration is intended to show an example of the first implementation of the second position of the balance level control balance level control The production and control of the book is to send the picture. The book C 9 is ~ Picture A ο 1X The diagram is intended to show examples. The implementation of the second and third chapter is clearly issued. The book is a picture AB IX 1X II-< The figure in the figure is an example of the fourth embodiment of the Mingfa. Figure C IX Γ! · *-

The figure of the magnetic field of the device production field shown in the figure and the figure is shown in Figure B. The figure of the nod-combined structure is A Figure 2 3 I 1V · 1

Ming Symbol Symbol 12 Figure 1 2 2 2 3 4 FL IX τ—H T—H r—I r-H IX IX

Page 12 584846 4 h Simple illustration of the diagram 2 0 2 2, 2 2 2 3, 2 3 2 5 to 2 6 2 7 3 1 3 2 to 3 3 4

4 h 1 △ h Δ L base

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Claims (1)

584846 Sixth, the scope of patent application 1 _ A head actuator is applied to a recording medium device and can be used to access the recording medium placed in the recording medium device. The reading and writing actuator includes: -A base for mounting more than one data access component; a support shaft for mounting the base, and allowing the base to move perpendicular to the recording medium on the support shaft and with the support shaft Rotate for the shaft; a focusing unit includes at least one focusing coil and a corresponding focusing magnet, the focusing coil is mounted on the base and around the support shaft, and the focusing magnet is mounted on the The focusing coil corresponds to the outer side. When the focusing coil is actuated, the base is moved along the support axis perpendicular to the recording medium by the magnetic force of the focusing magnet. A tracking unit includes at least one tracking unit. Coil and two tracking magnets, the tracking coil is installed on the outer edge of the base, and the tracking magnet is installed adjacent to the base, which can be actuated by the tracking coil to make the base Take the support The axis rotates until the tracking coil moves relative to one of the tracking magnets, causing a small-angle swing with its interaction with the tracking coil; and a magnetically sensitive element mounted on the base, which can be subjected to one of the tracking coils. The attraction of the orbital magnets normally keeps the base in a suspended state at the same time that the base is balanced at different floating distances relative to the recording medium, and provides the working heights of the data access components, respectively. Page 14 Page 15 584846 VI. Patent application scope, and can access magneto-optical media data. 10. The head actuator according to item 1 of the scope of patent application, wherein one of the data access elements is mounted on the base by using an elastomer, so that the data access element can communicate with the base. Generate relative motion. Page 16