Method and apparatus for magneto-optical recording and reading using optimized laser powers
US5703865A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 18, 1996 |
| Grant date | Dec 30, 1997 |
| Priority date | — |
| Expiry date | Nov 18, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10506
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magneto-optical (MO) disk drive. In one embodiment, the MO disk drive comprises a drive controller that controls operation of a laser source and a disk drive mechanism. The drive controller comprises a microprocessor and a memory subsystem coupled to the microprocessor. The memory subsystem comprises a memory device that stores programs directing operation of the disk drive and information used by the programs during operation of the disk drive. The stored information comprises an identifier that matches an identifier of a magnetic medium. The stored information also comprises a set of constant values characteristic of physical properties of the magnetic medium denoted by the letters h, k, s, c, .alpha., .beta. and .delta.. The stored information also comprises a set of equations that determine optimum write powers as a function of linear velocity, v, of the magnetic medium. The equations include: PA1 Ph(v)=hv.sup..alpha., Ph(v) is a preheat power; PA1 Pk(v)=kv.sup..beta., where Pk(v) is a peak power; PA1 Pm(v)=Pk(v)+s, where Pm(v) is a maintenance power; and PA1 Pc(v)=cv.sup..delta., where Pc(v) is a cooling power.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.