Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2005-05-10
2005-05-10
Allen, Stephone B. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S23700G, C359S566000, C359S569000
Reexamination Certificate
active
06891147
ABSTRACT:
An optical head device having an optical element capable of transmitting without diffracting light having a wavelength emitted from a two-wavelength semiconductor laser and capable of diffracting light having another wavelength, to provide high utilization efficiency of light in a stable manner.For this purpose, a wavelength-selective diffraction element1A comprising a transparent substrate having a front surface on which a grating having a periodically recessed and projected shape in cross section is formed and a filling member13A filled in the concavo-convex portion12A of the grating wherein the concavo-convex portion of the grating is provided with an organic pigment having the absorption edge of light in a region having a shorter wavelength than the wavelength λ1, and the concavo-convex member and the filling member have the same refractive index with respect to either one of light having a wavelength λ1and light having a wavelength λ2, and they have different refractive indices with respect to the other light having a wavelength, is disposed between the light source and the objective lens of the optical head device.
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Goto Ryuichiro
Hotaka Hiroki
Murakami Ryota
Nozawa Reiko
Ooi Yoshiharu
Allen Stephone B.
Asahi Glass Company Limited
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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