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Priority claimed from JP2002184117Aexternal-prioritypatent/JP2004029280A/en
Priority claimed from PCT/JP2003/015463external-prioritypatent/WO2005054910A1/en
Application filed by Jsr CorpfiledCriticalJsr Corp
Publication of TW200519852ApublicationCriticalpatent/TW200519852A/en
The present invention provides a wavelength plate for laser optical system, which employs the thin film made of cyclic alkene resin with elongated orientation for two laser beams in different wavelengths, wherein, the formula (a): Re(lambda)/lambda, in which the lambda is the wavelength of the laser beam (nm), and Re(lambda) is the speed reduction value of the laser beam (nm) penetrating the wavelength plate, and it is (0.2~0.3) +X for the first laser beam, and (0.8~1.2) +Y for the second laser beam (X is a number of multiples of 0 or 0.5, and Y is an integer larger than 0 or 1). The wavelength plate for the laser optical system according to the present invention is a wavelength plate with initially excellent characteristics, not subjected to the influence of usage and production environments, with long-term excellent reliability, and for applying to optical data recording/regeneration device with two types of laser beams in different wavelengths.
TW092134584A2002-06-252003-12-08Wavelength plate for laser optical system
TW200519852A
(en)
Optical recording medium, optical recording reproduction device, and data recording, reproducing and record reproducing methods of optical recording medium