Resources Contact Us Home
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
Systems and methods for economic retirement analysis
Polarity switching member of dot inversion system
Sitagliptin intermediate compounds, preparation methods and uses thereof
Author signatures for legal purposes
Image sensing apparatus and method of controlling the image sensing apparatus
Semiconductor device
Mobile terminal apparatus, radio base station apparatus and radio communication method
  Randomly Featured Patents
Process for improving the plasticity of ceramic composition and for reversing this effect
Light-tactility conversion system, and method for providing tactile feedback
Electronic component mounted structure and optical transceiver using the same
Transmitter, communication system, and communication method
Communications meshes
Automotive condenser
Picture frame having function of postal card
Multiprotocol adaptor for communication between CEBus devices and remote controllers over an ATM-based broadband access network
300 mm microenvironment pod with door on side
Discrete time direct sampling circuit and receiver