Photo-detecting device for reproducing information recorded on an optical disk

Abstract

The present invention relates to a photo-detecting device which records/reproduces a signal such as visual information on/from an information recording device such as an optical disk, and more particularly to a structure of a photo detector that receives light reflected from the optical disk, and a method for processing the signal outputted therefrom, and it is an objective of the present invention to obtain a reproduced signal having a good SN ratio without any effect of other signals by a rather simple structure. In order to attain the above objective, a photo-detecting device according to the invention, which is of the type used with an optical system that uses a light beam to read information optically recorded on a recording device wherein the light beam is radiated on and reflected from the surface of the recording device, includes a photo-detecting device having a plurality of light receiving sections for receiving the light beam reflected from the recording device; a digitizing device for digitizing an output signal corresponding to the amount of the light outputted from each of the plurality of light receiving sections in accordance with a predetermined threshold level and a calculating device for repetitively taking a digitized signal outputted from the digitizing device by the frequency more than twice as many as the required maximum level thereof.

Dependencies are inferred from the claim text.