Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1989-05-22
1991-12-03
Envall, Jr., Roy N.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369118, 369 4423, 369 4424, 2502015, G11B 700, G00J 120
Patent
active
050704931
ABSTRACT:
An optical assembly incorporating a wedge-shaped optically transparent prism, a 45 degree right isosceles triangular prism which has two thin film coated surfaces, a rhomboidal prism attached to the triangular prism, a second, smaller 45 degree right isosceles triangular prism attached to one end face of the rhomboidal prism and two planoconvex lenses attached to the combination of the rhomboidal and second triangular prisms is mounted within a housing. All of the optical components are cemented to the adjacent component utilizing a transparent optical cement to form an integral unit. Data and servo detector assemblies and a diode laser light source are mounted on the external surfaces of the housing to form a stationary optical assembly which provides the following functions: generates a collimated beam of light whose power output may be modulated electronically to perform read, write and erase functions; generates an electrical data signal derived from a portion of a returning light beam; and generates suitable electrical error signals for servomechanical control of radial and axial motion of a focused light spot on information storage media.
REFERENCES:
patent: 4783589 (1988-11-01), Ando
patent: 4804835 (1989-02-01), Ando
patent: 4959824 (1990-09-01), Ueda et al.
Bell, Jr. Bernard W.
Campbell David K.
Marshall Daniel R.
Towner David K.
Envall Jr. Roy N.
Hewlett--Packard Company
Hindi Nabil
Oberheim E. F.
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