Diamond pickup stylus with good grindability

Diamond shaped holographic storage regions oriented along a comm

Dielectric constant measuring apparatus, dielectric constant...

Dielectric information apparatus, tape-like medium...

Dielectric recording apparatus, dielectric reproducing...

Dielectric recording medium, and method of and apparatus for...

Dielectric recording/reproducing head and dielectric...

Differential optical switch for data multiplexing in an optical

Diffraction device for reading and/or writing a record carrier

Diffraction element and optical head device equipped therewith

Diffraction element and optical pick-up apparatus having the...

Diffraction element and optical pick-up assembly

Diffraction grating and optical pickup apparatus with diffractin

Diffraction optical element, molding die for the optical...

Diffraction type lens which converges two wavelengths of light

Diffraction type optical pickup lens and optical pickup...

Diffractive element, method of manufacturing the same,...

Diffractive optical element and method of designing the same

Diffractive optical element and optical head

Diffractive optical element with a pair of opposite surfaces...