Patent Number: 6,298,018

Title: Optical recording and reproducing method optical recording and reproducingdevice, and optical recording medium

Abstract: An optical disk is provided with a recording layer, and with an opticalcoupling layer on a light-incident side of the recording layer. An opticalrecording and reproducing device and method include an objective lens anda hemispherical lens, which converge a light beam from a light source andproject the light beam onto the optical disk. The hemispherical lens isprovided in close proximity to the optical coupling layer, in a positionsuch that an interval therebetween is not more than the wavelength of thelight produced by the light source. The light beam converged by theobjective lens and the hemispherical lens is coupled with the opticalcoupling layer while substantially maintaining a direction of propagationin which it was propagating while inside the hemispherical lens.

Inventors: Takahashi; Akira (Nara, JP), Murakami; Yoshiteru (Nishinomiya, JP), Iketani; Naoyasu (Tenri, JP), Suzuki; Ippei (Tenri, JP), Mori; Go (Nara, JP), Hirata; Shinya (Nara, JP)


International Classification:

Expiration Date: 10/02/2013