Resources Contact Us Home
Focusing distance of an objective lens according to a vertical deviation standard of optical recording media with different thicknesses

Image Number 14 for United States Patent #5883873.

An optical recording and reproducing device of the present invention has an objective lens designed so as to form a light spot with a set diameter on a DVD, while to form, on a CD, a light spot with a set diameter different from the above diameter. Respective working distances WD1 and WD2 with respect to the DVD and the CD are set in accordance with deflection standards F for the DVD and the CD, respectively. By doing so, as compared with conventional cases where the deflection standards F are not taken into consideration, the working distance WD1 is decreased. As a result, the device is thinned, compared with the conventional cases.

  Recently Added Patents
Temporary protective cover for an exposed junction box
Tetrazolyl oxime derivative, salt thereof, and plant disease control agent
Blueberry plant named `DrisBlueFour`
Optical article including an antireflecting coating having antifog properties and process for making same
DKK1 oncogene as therapeutic target for cancer and a diagnosing marker
Error protection for pipeline resources
Method and system for determining an optimal missile intercept approach direction for correct remote sensor-to-seeker handover
  Randomly Featured Patents
Pulse width modulator circuit for switching regulators
Friction-drive stage
Optical system and device using the same
Hydraulic pressure control device for an automatic transmission
Process for manufacturing composite glass/Si substrates for microwave integrated circuit fabrication
Micro-actuator and head gimbal assembly for a disk drive device
Chromate recovery process
Method of controlling combustion in a fluidized bed furnace
Acrylonitrile recovery process
Methods and apparatus for controlling refrigerators