Resources Contact Us Home
Modified light-receiving element in an optical pickup for reading optical discs

Image Number 5 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
Systems and methods for controlling registration of advancing substrates in absorbent article converting lines
Reovirus for the treatment of cellular proliferative disorders
Radio communication device and sequence length adjusting method
Piano keyboard with key touch point detection
Wafer level package and fabrication method
Highly specialized application protocol for email and SMS and message notification handling and display
Use of deuterium oxide for the treatment of virus-based diseases of the respiratory tract
  Randomly Featured Patents
Converging solar module
Bioreactor configured for various permeable cell supports and culture media
Charcoal tray and cooking rack for dual fuel barbeque grill
Method for electrostatic deposition of graphene on a substrate
Stretcher frame FR decorative materials
Schottky barrier diode and MOSFET semiconductor device
Composition for imparting flame resistance and water repellency to textiles
Unfurlable mesh reflector
2-(6-Substituted-2'-naphthyl) acetic acid derivatives and the salts and esters thereof
High frequency aircraft wire antenna