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Light intensity converter
| Details |
Inventors: Tawa, Fumihiro; Hasegawa, Shinya;
Assignee: Fujitsu Limited (Kawasaki, JP)
Primary Examiner: Le; Que T.
Assistant Examiner:
Attorney, Agent or Firm: Armstrong, Westerman, Hattori, McLeland & Naughton
The light intensity converter comprises a transparent body including opposite first and second curved surfaces. The body is surrounded by an outer peripheral surface extending between the first and second curved surfaces. The body of the converter is arranged such that the incident light is made incident to the body at the first curved surface and emerges from the second curved surface. The incident light diverges in a certain area and converges in another area, by refraction, so that the light intensity distribution of the incident, first curved surface is converted into a different light intensity distribution while the light travels through the converter, and thus exits from the second curved surface. |
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DETAILED DESCRIPTION The object of the present invention is to provide a light intensity converter having a small thickness and a simple configuration capable of emerging a light beam while changing the light intensity distribution, and an optical device and an optical disk drive using such a light intensity converter.
A light intensity converter according to the present invention comprises a body having a center axis, a first curved surface extending transversely to the center axis, a second curved surface extending transversely to the center axis, and an outer peripheral surface extending between the first curved surface and the second curved surface, and wherein said body is constructed such that a light having first light intensity distribution is made incident to said body at said first curved surface, the incident light diverges in a first area in said body and converges in a second area in the body, by refraction, when the light enters said body from said first curved surface, and the light emerges from said body at said second curved surface, the emerging light having a second light intensity distribution different from said first light intensity distribution.
This light intensity converter can be formed as a thin body and can positively convert the light intensity distribution of the incident light into a uniform light intensity distribution.
Preferably, the incident light entering from the first curved surface diverges in the central area around the center axis of the body and converges at the peripheral area in the body.
Preferably, the amount of inclination of the outermost peripheral portion of the first and second curved surfaces and the amount of inclination at a point where the inclination changes from ascendance to descendance or from descendance to ascendance have opposite signs and substantially the same absolute value.
Preferably, the thickness of the body is such that the RMS value of wavefront aberration of the exiting light with respect to the incident light is not more than 0
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