| 摘要 |
PURPOSE: To obtain an optical head in which high density recording is realized by increasing the track density. CONSTITUTION: A TM mode laser emitting laser light, where the direction of a field vector VE is in parallel with the long axis APm of the elliptical far field pattern Pf, is employed as a laser light source 11. Consequently, an elliptical convergent beam Bc, having long axis ABm in the tangential direction of a disc 20 and short axis in the radial direction of the disc 20, is projected from an optical head 10. |
