Optical recording head capable of correcting spherical aberration
First Claim
1. An optical element comprising:
- a central axis;
a first surface extending in a transverse direction with respect to the central axis;
a second surface extending in the transverse direction with respect to the central axis; and
a peripheral surface extending between the first surface and the second surface;
wherein light is refracted from the time when light is incident on the first surface to the time when the light is emitted from the second surface, and thereby a light intensity distribution of the light emitted from the second surface and a light intensity distribution of the light incident on the first surface are different from each other, anda rim intensity improvement rate R, which is a ratio of rim intensity of the emitted light with respect to rim intensity of the incident light is 1.07 or more and 1.5 or less, in which rim intensity represents a ratio of the central intensity to the peripheral intensity.
1 Assignment
0 Petitions
Accused Products
Abstract
An optical element having a high capture efficiency and rim intensity is provided. The optical element includes a central axis, a first curved surface extending in the transverse direction with respect to the central axis, a second curved surface extending in the transverse direction with respect to the central axis, and a peripheral surface extending between the first curved surface and the second curved surface. Light is refracted from the time light is incident on the first curved surface to the time the light is emitted from the second curved surface. Thereby, a light intensity distribution of the light emitted from the second curved surface and a light intensity distribution of the light incident on the first curved surface are different from each other, and a rim intensity improvement rate R, which is a rate of the rim intensity of the emitted light with respect to the rim intensity of the incident light is 1.07 or more and 1.5 or less, in which the rim intensity represents a ratio of the central intensity to the peripheral intensity.
6 Citations
22 Claims
-
1. An optical element comprising:
-
a central axis; a first surface extending in a transverse direction with respect to the central axis; a second surface extending in the transverse direction with respect to the central axis; and a peripheral surface extending between the first surface and the second surface; wherein light is refracted from the time when light is incident on the first surface to the time when the light is emitted from the second surface, and thereby a light intensity distribution of the light emitted from the second surface and a light intensity distribution of the light incident on the first surface are different from each other, and a rim intensity improvement rate R, which is a ratio of rim intensity of the emitted light with respect to rim intensity of the incident light is 1.07 or more and 1.5 or less, in which rim intensity represents a ratio of the central intensity to the peripheral intensity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
-
Specification