Protecting film for optical recording medium and optical...

G - Physics – 11 – B

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

G11B 7/24 (2006.01) C08J 5/18 (2006.01) C08L 69/00 (2006.01) C08L 101/00 (2006.01) G11B 7/244 (2006.01) G11B 7/253 (2006.01) G11B 7/254 (2006.01)

Patent

CA 2375620

An optical recording medium protecting film which is a protecting film comprising a single transparent film made of a thermoplastic resin, having a retardation of no greater than 15 nm at a wavelength of 550 nm and a K value of no greater than 40 nm at 550 nm, having a glass transition temperature of 120°C or higher and a water absorption of no greater than 1 wt%. ¦R(550)¦ <= 15 nm (1) ¦K(550)¦ <= 40 nm (2) (the K value being calculated by K = [n z - (n x + n y)/2] x d {where n x, n y and n z are the three-dimensional refractive indexes of the transparent film in the x-axis, y-axis and z-axis directions, respectively, and d is the thickness of the transparent film}). Also, an optical recording medium having a data recording layer and the above-mentioned protecting film on a substrate, wherein light is incident from the protecting film side.

L'invention concerne une garniture de protection destinée à un support d'enregistrement optique, caractérisée en ce qu'elle comporte une feuille de pellicule transparente contenant une résine thermoplastique, et en ce qu'elle présente une différence de phase de 15 nm ou moins, une valeur de K de 40 nm ou moins à une longueur d'onde de 550 nm, une température de transition vitreuse de 120 DEG C ou plus, et une absorption d'eau de 1 % en poids ou moins, avec K = [n>z< - (n>x< + n>y<)/2] x d, n>x<, n>y<, et n>z <représentant respectivement les indices de réfraction dans les directions des axes x, y et z de la pellicule transparente, et d étant une épaisseur de la pellicule transparente. L'invention concerne également un support d'enregistrement optique caractérisé en ce qu'il comporte un substrat, une couche d'enregistrement d'informations formée sur le substrat, et ladite pellicule protectrice, l'incidence de lumière étant effectuée à partir du côté de la pellicule protectrice.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Protecting film for optical recording medium and optical... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Protecting film for optical recording medium and optical..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Protecting film for optical recording medium and optical... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1879855

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.