Colpitts type oscillator having reduced ringing and improved optical disc system utilizing same
US5748578A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 11, 1995 |
| Grant date | May 5, 1998 |
| Priority date | — |
| Expiry date | Apr 11, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K41/0356
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A Colpitts type oscillator circuit for mitigating the effects of undesired oscillator ringing when write pulses are supplied, such as those encountered in compact disc, laser disc, and magneto-optical players or recording devices. Circuit elements are provided for mitigating the effects of oscillator ringing including replacement of an inductor with a suitable resistive load and an oscillator supply voltage maintained above a predetermined minimum voltage which is a function of the specific values of the related circuit elements. An improved optical disc system also includes the present Colpitts type oscillator in combination with an optical assembly, a laser light source, an objective lens subassembly, an objective lens, an actuator assembly, a photodetector, first and second servomotors, a source of write pulses, a first electronic circuit for controlling the servomotors, a motor for moving a respective disc, a second electronic circuit for decoding, a third electronic circuit for enabling the laser light source, a voltage supply for the oscillator, a data receiver, a data encoder, a magnetic field generator, a cartridge loading assembly for removably positioning the respective d…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.