TW455836B - System, method and information carrier for laser-stimulated magnetic recording - Google Patents

Abstract

A magnetic disk has a layered configuration comprising a recordable layer and a reflective layer. Laser-stimulated recording takes place by a magnetic head that obstructs the laser beam for a minor portion. The converging laser beam traverses the recording layer and gets reflected at the reflective layer, whereupon it reaches its focus in the recordable layer. The head gets only a fraction of the radiation. This enables to keep the head's temperature well within control.

Description

45 583 6 '~~ ----- V. Description of the invention (1) Title of the invention The present invention is related. Technical background In a small optical recording process during laser excitation, the energy required can achieve such a configuration package as shown in the US patent. The field heating light has a southern accuracy, and the US patent has another group. This reference record carrier. Β-light port between bodies. A magnetic recording point specifically reduces the laser excitation by lightning on the light spot. 5, 56 5, with a magnetic head, and a coordinated servo position 5, 30 7, in which the data reveals that the device has radiation. The material of the Juming material can be refracted into a material with a large diameter. The coil of the known group will generate some laser-excited magnetic data when the read-write device is able to reduce the size and record it on an information carrier. There are magnetic recordings that allow high density. The magnetic recording layer is heated by radiating a light beam in such a manner that the room temperature record is generated by the magnetic head and used to record less information. Several known types of magnetic heads and optical heads for recording are briefly discussed below. No. 385 is cited herein as reference material, and its disclosure is on one side of the recording medium; and one is for the other side of the media. This configuration requires two service systems to position the magnetic and optical heads. No. 3 28 is cited here as a reference material, which reveals that the laser head and the magnetic head are located on the same recording medium-a device for writing, reading or erasing a coil coiled around the object lens and the recording focus on One point, and the coil formed by the concentrated beam passing through the coil is located at the coil opening, which reduces the range of the focused beam. Such a decrease ' also increases the magnetic field generated. It only works within certain parameters, but it is missing due to the higher data density on the record carrier. For example, each unit area passes through

Page 4 455836 V. Description of the invention (2)-The laser energy of the bright coil will increase with the smaller device size. This will cause the coil temperature to rise, and eventually the head will heat up, and Head performance will decrease with increasing temperature. US Patent No. 5, 193, 082-Another type is related. The reference head and optical head are integrated into a single unitary block. The optical system is connected to the magnetic head with the tape. The optical system consists of a tube and a diffractor. The "diffractors and magnetic heads of the amplifier" focus the laser light on the recording medium to a magnetic field. This type also requires a relatively large ferrite zone to move at the maximum speed, but it does not come properly. Said that the laser beam at an angle the projection axis is perpendicular to the cross-section of the beam will be much smaller than a higher power diode with a mass density. Also, projections on the media cause undesired interference, which can expand it. This will produce an inventable purpose that may not even be possible for the material of the recording medium. This reference is a reference material, which reveals a system in which the magnetic element ° the early element contains a single iron block surface, One side of the block consists of a laser diode, a waveguide optical system and a solid magnetic head which are adjacent recording media. The diffractor imposes a point on the waveguide's position at that point with some disadvantages. This type of unit requires a block as a base. Therefore, the unit depends on the inertia of the block. Further shot on the recording medium. Any cross section of the light spot on the medium, so you need to obtain the same laser beam deflection on the energy surface as in the vertical irradiation, which is the non-uniformity that leads the light to disappear at one point but is well controlled at another point. Heated with adverse effects. The object of the invention is therefore to propose an alternative to the known recording methods. Another object of the present invention is to propose a configuration to eliminate the presence =

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"Lack of earlier technology" Summary of the Invention For the purpose of cutting media of this field and electromagnetic radiation recordable media head, to manipulate the body when exposed to a through beam with a disc-blocking beam section or U-shaped section | part of the electromagnetic beam For the purpose, the present invention proposes an information processing system that puts a recordable medium in a magnetic environment for reading and / or modifying: information content. The system includes a source of radiation to generate a magnetic field and a source of radiation. When the system performs a, the magnetic head is actually placed in the light beam, so that the electromagnetic radiation outside the magnetic head of the recordable medium i can be exposed. For example, the continuous light shape of the wearing surface, when the magnetic head is placed in the beam, the magnetic head will cross-section, and a specific ring in the plane of the magnetic head 'preferably in the path of the beam, so that the magnetic head does not absorb radiation And direct the radiation along the magnetic head. Because the head area is small, a focus formed by the beam will be of sufficient quality to scan the record. It is best to provide a reflective medium in the system as a support system to operate. This recordable medium is between a magnetic head and a radiation source on one side, and a reflective medium on the other side. The reflective medium reflects the radiation to one side of the magnetic head to concentrate the reflected radiation near the magnetic head and the radiation from the other side. The recordable and reflective media are arranged so that the reflection from the reflective medium onto the recordable medium is concentrated The radiation path length of the area radiation will be much longer than the wavelength of the radiation. Both the recordable medium and the reflective medium are preferably integrated into a physical device, such as a magnetic disk 'to support the operational use of the system. The system may also include a lens' to control the main direction of radiation, and the magnetic head is connected to the lens.

45 583 β

V. Description of the invention (4) The present invention is also related to a physical device, such as a magnetic disk, the set and a recordable medium are exposed to the magnetic field generated by the first side of the recordable medium and the first side of the recordable medium Of the electromagnetic radiation produced

Is ϊ ΓΤΊ | > · Modify the information content of recordable media. The device has a reflective medium which is located on the second side rather than the first side of the recordable medium, and reflects radiation towards the printable medium with '' π '. The recordable and reflective media are arranged so that the light-emitting path reflected from the reflective medium to the concentrated area on the recordable medium will have a path length much greater than the wavelength of the radiation. The optically recorded information, which may also be contained in the recordable medium, may be appended or rewritten. A recordable recording medium including the operating body is placed through the area and the magnetic field. The cross section of the magnetic head on the media storm is placed on the side of the information processing side of the inverse radiation. The magnetic field and the signal content are carried by the radiation source and can be. A reflective medium and magnetic field are used to make the length of the reflective path 0. • Generate a radiation source through the magnetic head to generate electromagnetic radiation. A combination of electromagnetic radiation is used for modifiable pairs. Partial interference between the magnetic field and the application side of the radiation ^ The recording medium is partially interfered = the medium is used to reflect light, which can be recorded: between the head ... the recorded medium and the reflective medium J The reflected medium is reflected on the recordable medium. Much larger than the wavelength of radiation. The present invention proposes a type in which a laser and a magnetic head are placed on the same side of a recordable medium. A mirror is used on the opposite side of the recordable medium, so that the mirror can receive and reflect the laser beam passing through the recordable medium, so that the reflected beam can be focused on the laser beam near the magnetic head. On or inside recording media. The mirror and the magnetic recording medium are preferably separated by a fixed distance 'so that the optical path length is substantially constant. Light path

4 5 δΗ3 6 Five 'J Description of the invention (5) The diameter length is substantially larger than the wavelength of the radiation used. The reflector is preferably physically integrated with a base contained in a mechanical carrier. The recording layer is Place on a thin plate with a strictly controlled thickness (for example, 0.1 mm or 0.2 mm thick). The sheet is connected to the base. The disc now has a mirror on one side of the sheet and a magnetic recording layer on the other side of the base. This base is then attached to a thicker and tougher carrier. According to the above configuration, the laser beam transmitted on the recordable layer and reflected by the mirror can be focused on a point on the recording layer facing the magnetic head. The magnetic head will now interfere with the laser beam cross section with less and therefore will not Exposed to harmful large amounts of radiation as in the previous technical configuration and therefore will not cause the temperature to rise to disable the system Q Brief description of the drawings The invention is based on embodiments and with reference to the attached drawings- Step instructions. Figures 1, 2 and 3 show the system configuration and recordable device of the present invention. In all the drawings, the same reference numerals represent related or similar features. 0 A better specific embodiment. FIG. 1 is a component drawing of the magnetic recording system 100 of the present invention. System 100 includes a magnetic head 102; an optical sub-system 104 with a radiation source 106 to generate a radiation beam 108; and one for recording under the integrated control of both the magnetic head 102 and the radiation source 106. Or a recordable medium that eliminates data, the radiation source 106 includes' for example, a laser utilizing the principle of laser-guided magnetic recording as described above. The magnetic head 102 and the radiation source 106 are located on the same side of the recordable medium 11 0-side, in this figure it is the __ side below D system 1 0 0 goes further

45583 6 V. Description of the invention (6) Contains a reflective medium Π2 to reflect the radiation projected by the radiation source 106 onto the recordable medium 110. The magnetic head 102 is located in the optical path between the radiation source 106 and the recordable medium 110, and thus can interfere with a part of the light beam 108. The recordable medium itself is located between the magnetic head and the reflective medium. The reflective medium 1 1 2 is used to generate the focal point of an optical system 4 in the recordable medium 110 just above the magnetic head 10 2 (as shown in the figure). The light path between the radiation source 106 and the focal point 1 14 includes the part from the radiation source 106 to the reflective medium 11 2 and the part from the reflective medium 丨 2 to the focal point u 4. The length of the optical path is longer than the length from the radiation source [06] to the lower side of the recordable medium 1 10. = According to this, the width of the light beam 108 located on the plane θ2 of the magnetic head is much larger than the actual size of the magnetic head 102. The head will receive only a small portion of the radiation. The reflective medium 112 and the magnetic head 102 are fixed components in comparison with each other, so that the recordable medium no can be moved relative to the magnetic head 102 and the reflective medium 112. In addition, both the 'reflection medium 112' and the recordable medium 110 are elements integrated in a layered configuration such as a magnetic disk or magnetic ττ. I will explain further with FIG. 2 "FIG. 2 is a diagram of the system 200 of the present invention. The system 200 includes a magnetic disk 202 containing a recordable medium 110 and a reflective medium 112. The magnetic disk 202 includes a hierarchical configuration, in which a recordable medium is placed between the protective layer 204 and the transparent layer 206. The reflective medium 112 is located between the transparent layer 206 and a support base 208. The optical path length of the radiation between the recordable medium nG and the reflective medium 112 is longer than a typical radiation wavelength, and geometric optical energy can appropriately describe these optical paths. It is worth mentioning that located

45 583 6 V. Description of the invention (Ό '" --- The optical path length between the recordable medium 1 10 and the reflective medium i 12 is generally a constant. This can be achieved by, for example, setting the media 110 and 112 The transparent layer 2 0 6 having a functionally uniform refractive index and a functionally uniform thickness is sandwiched between two media. The reflective media 1 12 can be deposited on the base 208, for example, using Chemical vapor deposition or other suitable techniques known in the bank to achieve this purpose. According to the above configuration, the laser beam reflected from the mirror 112 can be focused on the upper part of the magnetic head m (such as (Pictured) recording layer 110. The magnetic head 10 is now receiving far fewer laser beams than the previously known configuration. Therefore, the magnetic head will not be exposed to a large amount of harmful radiation, and The temperature is too high to make the system 100 or 2000 fail. In a preferred embodiment, the radiation source 106 includes a blue laser with a wavelength range of 400 to 500 dust meters (nm).丨 12, for example, can be much thicker than 0, 1 The transparent layer 206 between 2 mm is thin. The optical sub-system 104 uses a high NA (numerical aperture) lens, such as 0.8 NA, to read or write data to a smaller area on the function. For tracking purposes, a 0.4NA lens is sufficient. The transparent layer 2Q6 may be a thin plate with a well-controlled thickness that allows the light path to pass through the transparent layer 206 (twice its thickness times its refractive index). It is generally constant. The transparent layer 206 can be accompanied by the grooves previously pre-drawn on the magnetic recording layer to achieve feeding purposes (such as the ring or spiral on the optical disc or as it appears on digital video discs-can Read / write / random access memory land / ditch structure). The systems 100 and 200 may be, for example, a consumer device, such as a vending machine, by the consumer using recorded information selected from a recordable medium 1 1 0

Page 10 4 5 5 8 3 6 V. Description of the invention (8) Enable the paying consumer to produce his / her own edited content (such as sound or video) °… Circle 3 is the embodiment 3 of the system 100 and 200 〇〇. In Example 300, the magnetic head 102 is physically combined with the lens 304 (for example, incorporated in the lens or placed on the lens 304) to focus the radiation beam log. The position of the lens 304 and the magnetic head 102 can now be controlled by a single adjuster (not shown). The radiation beam 108 is projected on the lens 304 as an annular beam, which means that the light beam is set in an annular region, but in fact, no radiation passes through the region 305 in this annular region.

Claims (1)

45 583 6 VI. The scope of application for patents is based on the Beixun processing system (100), so that a recordable medium (110) can be exposed to Komlin v. M electric field under the (108) beam. 'To modify the information content of the recordable media, the system contains: 811 Γ Magnetic head (102) for generating magnetic fields: and-, Aunt: Radiation source (10 6) for generating radiation In order to make the recordable medium 俨 晨 霞 私 1 use, the magnetic head is placed in the light beam, and the medium 9 is exposed to the electromagnetic radiation passing through the outside of the magnetic head β 丄 If the system of the scope of patent application item I, where:- The recordable medium is arranged between 3 = "reflection media (112); the other side of the media; the-side of the Shuo and the round source and the reflection-reflection medium is used to reflect radiation to the magnetic head side, to Reflected radiation near the magnetic head Bayi § The recorded medium and the reflective medium are arranged so that the wavelength of the radiation from the reflective medium at the wavelength of the vehicle will be far longer than the system around item 2 , Where both the recordable medium and the reflective medium are 0 in a physical device (The system is used for operation. It is used to support the 4_ system such as the scope of patent application, a magnetic disk. The member device contains 5. The system as described in the scope of patent application, where: The system includes a Lens (304) to control the main direction of the radiation produced by μr Scope of patent application Song and lens form a structural component. , 6 · ~ physical devices (202), including: a recordable medium (110), exposed to the obstruction field produced from the first side of the recordable medium and the radiation generated from the first side of the recordable medium 0 ") "'To modify the information content of the recordable medium; and ~ reflective media (112), located on the other side of the recordable medium than the first', to reflect radiation towards the recordable medium; # 中 ： 可. The medium and the reflective medium are arranged so that the light radiated by J to the concentrated area on the recordable medium will be 22 times greater than the wavelength of the radiation. 7. The device in the sixth scope of the patent application includes a Magnetic disks. 8. The device according to item 6 of the patent application, in which the recordable medium contains pre-recorded information. 9. A method of information processing, including:-generating a magnetic field through a magnetic head (102); ~ through a Han Sheyuan (106) generates radio; '' Exposing a recordable medium (110) to a combination of magnetic field and radiation to modify the information content of the recordable medium. The methods used include: -Operate the magnetic head between the radiation source and the recordable medium to partially interfere with the radiation;-Use a reflective medium (1 丨 2) to reflect the radiation and convert the recordable medium O: \ 61 \ 61713.PTD Page 13 4 5 583 6 6. The patent application scope is placed between the reflective medium and the magnetic head; of which:-the recordable medium and the reflective medium are arranged so that the reflective medium The light path length of the radiation reflected to the concentrated area on the recordable medium will be much longer than the wavelength of the Korean radiation. O: \ 61 \ 61713.PTD Page 14