Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Modified light-receiving element in an optical pickup for reading optical discs










Image Number 2 for United States Patent #6212149.

An optical pickup includes a photo-detector. The photo-detector is structured by light receiving elements on one of which a blind zone is formed. If a relationship between an output of the light receiving element formed with a blind zone and a lens position is displayed as a graph on a measurement signal output device, a point that a beam converges on the blind zone, i.e., a point that a spot size assumes a minimum, is displayed as an edge. In the photo-detector, a region for receiving a sub-beam on light shield side, i.e., one sub-beam having a grater spot size, has a width broader than a width of a region for receiving a sub-beam on an aperture side, i.e., another sub-beam smaller in spot size.








 
 
  Recently Added Patents
Transparent zebrafish and preparation method thereof
Actuators and moveable elements with position sensing
Non-visual presentation of information on an electronic wireless device
Wafer recycling method
Light-reflective anisotropic conductive paste and light-emitting device
Processor engine, integrated circuit and method therefor
Film, polarizing plate and display device, and method of manufacturing film
  Randomly Featured Patents
Method for fabricating semiconductor wafers
Combined license plate frame and display unit
Baby bottle washer
Method of forming a metal gate in a semiconductor device using atomic layer deposition process
Corrosion resistance treatment of aluminum with N-alkyl-fluoroaliphaticsulfonamidophosphonic acids and salts thereof
Printing apparatus
Heat-treatable dichroic mirrors
Amorphous silicon electrophotographic photoreceptor with an intermediate gradient layer and its method of preparation
Device for charging a measuring apparatus for thermal analysis with material specimens filled into containers
Footrope construction for a bottom trawl