Patent · US Expired

Electrically controlled adjusting device for a light beam with digital and analog deflection control

US4123147A · kind A · utility

7Cited by

2References

8Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Bernhard Hill · Hamburg, DE
Rudiger Pepperl · Pinneberg, DE
Johann E. W. Kruger

Key dates

Filing date	Mar 8, 1977
Grant date	Oct 31, 1978
Priority date	—
Expiry date	Mar 8, 1997

Classification

Technology area (CPC G)Physics
CPC primaryG11B7/0901
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A light deflector used for tracking a spiral information track alternately and periodically interrupted by data blocks and guide segments arranged within sectors of a rotating record carrier. The light deflector is controlled during the first turn of the information track by a slow analog light deflector having a small stroke and is controlled during the remainder of the recording by a digital light deflector control device having a relatively large stroke.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.