Optical head device with lens system for increasing beam diamete

Details Optical head device with lens system for increasing beam diamete Optical head device with lens system for increasing beam diamete

1996-09-23

1998-01-13

Nelms, David C.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369109, 369 4423, G11B 700

Patent

active

057086427

ABSTRACT:
An optical head is provided which device has an optical system with which light emitted from a laser source and reflected from a beam splitter is converged onto an optical disk by an objective lens and reflected light is guided to a photo-detector. The optical system includes a beam diameter enlarging lens which enlarges beam diameter of luminous flux incident on the objective lens from the laser source through the beam splitter. The beam diameter enlarging lens may be a conical lens. According to the present invention, it is possible to enlarge the range over which access can be made by the objective lens alone without requiring means such as a lens actuator.

REFERENCES:
patent: 4179708 (1979-12-01), Sheng et al.
patent: 5157555 (1992-10-01), Reno
patent: 5402407 (1995-03-01), Eguchi et al.
Author Unknown; "Selective Aperture Illumination for Increased Depth of Focus"; Jun. 1, 1995; p. 109; IBM Technical Disclosure Bulletin, vol. 38, No. 6.

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