Resources Contact Us Home
Objective lens, optical element, optical pick-up apparatus and optical information recording and/or reproducing apparatus equipped therewith

Image Number 17 for United States Patent #7483358.

A hybrid objective lens has a refractive lens and a diffractive optical element constructed by plural coaxial ring-shaped zones on at least one optical surface thereof. When n1, n2 and n3 each is a diffraction order of a diffracted ray having a maximum light amount among diffracted rays of each of first, second and third light flux having wavelength .lamda.1, .lamda.2 and .lamda.3 when respective light flux comes to be incident into the diffractive structure respectively, the following formulas are satisfied: |n1|>|n2|, and |n1>|n3 |, and the hybrid objective lens converges a n1-th, n2-th and N3-th order diffracted ray of the first, second and third light flux onto an information recording plane of each of the first, second ant third optical information recording medium respectively so as to form an appropriate wavefront within respective prescribed necessary image side numerical apertures.

  Recently Added Patents
Power surface mount light emitting die package
Electric power supply system and electric power supply system for motor vehicle
Reconfigurable barrel shifter and rotator
Method of producing probabilities of being a template shape
Satellite mounting poles
Maintenance guidance display device, maintenance guidance display method, and maintenance guidance display program
Polarization-coupled ferroelectric unipolar junction memory and energy storage device
  Randomly Featured Patents
Method and apparatus for indexing and searching content in hardcopy documents
Method of disaster recovery testing and storage system
Apparatus for ordering to phototake with eye-detection
IC measuring device
Blends of stretchable liquid crystal polymers with thermoplastics
Hog scraper paddle
Catamenial bandage
Telecommunication system for wireless telecommunication with a CDMA, FDMA, and TDMA multiple access component
Monoclonal antibodies against activated protein C
Pole attachment