| Autor: |
Yoshihiro Okino, Tetsuo Saimi, Ryoichi Imanaka |
| Rok vydání: |
1989 |
| Předmět: |
|
| Zdroj: |
The Journal of the Acoustical Society of America. 85:1399-1399 |
| ISSN: |
0001-4966 |
| DOI: |
10.1121/1.397340 |
| Popis: |
The combination of recordable-reproduceable optical discs and reproducing-only optical discs and an optical disc player which is capable of reproducing recorded signals both from the recordable-reproduceable optical disc possessing pregrooves and the reproducing-only optical disc possessing recording pits by means of a common optical system. The common optical system has a common laser for irradiating both types of discs with a laser beam used for reading the discs. The wavelength of the laser is λ and the depth or height of the pregrooves of the recordable-reproduceable optical disc is made equal to or less than λ/8n, and the depth or height of the recording pits of the reproducing-only optical disc is made equal to or greater than λ/8n but less than λ/4n, wherein n is the refractive index of the substrate of the disc or the protective layer provided on the surface thereof. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
