Short wavelength optical disk head having a changeable aperture

Details Short wavelength optical disk head having a changeable aperture Short wavelength optical disk head having a changeable aperture

1992-12-23

1994-01-25

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369117, 369118, G01S 120

Patent

active

052817970

ABSTRACT:
An optical disk head having a short wavelength light source has an aperture diaphragm placed in the course of its focusing optical system which can change its aperture diameter depending on the pit size on an optical disk in order to allow recording on and reproducing from not only a short wavelength optical disk, but also a long wavelength optical disk. The aperture diameter is made larger for the smaller pit size and vice versa, and the light source output is adjusted depending on the aperture diameter so that the light amount coming from the disk surface to a photodetector cannot be changed with the aperture diameter.

REFERENCES:
patent: 4079248 (1978-03-01), Lehureau et al.
patent: 4638471 (1987-01-01), van Rosmalen
patent: 4694443 (1987-09-01), Ando

Affiliated with

Also associated with

Rating

Short wavelength optical disk head having a changeable aperture does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Short wavelength optical disk head having a changeable aperture, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Short wavelength optical disk head having a changeable aperture will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-729591