| 摘要 |
PURPOSE: A super resolving power lens is provided to record near field optical information without another condenser lens, to prevent deterioration of a condensing capacity caused by aberration, and to be curved on the bottom, thereby reducing a risk of being collided with a surface of a recording medium. CONSTITUTION: An upper surface(91) of a lens is a plane, and a lower surface thereof is curved. An edge(92) of a lower surface of the lens is curved, and a center(93) thereof is a plane. The lower surface is coated with a reflective material. A central peak of the lower surface is not coated with the reflective material. The center where a lens focus is formed is formed lower than the lower surface of the lens. An optical system using a near field is located closely to a measured target or a recording medium. An area where an optical focus of the optical system is formed is exposed on the air. |
