Optical head device and near-field light emitting device
First Claim
1. An optical head device comprising:
- an optical element comprising;
a planar first reflective surface which has a light transmitting portion in its center;
a spheroidal second reflective surface which converges light on the light transmitting portion; and
a concave portion which is located in a center of the second reflective surface and which transmits light; and
a light source which emits a divergent bundle of rays from a point which is a center of the curvature of the concave portion.
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Accused Products
Abstract
An optical head device which has an optical element and an optical fiber. The optical element is made of a material with a high refractive index and has a planar first reflective surface and a spheroidal second reflective surface. A hole which serves as a light transmitting portion is made in the center B of the first reflective surface, and a concave portion which transmits a divergent bundle of rays emitted from a radiating point A of the optical fiber is made in the center of the second reflective surface. The points A and B are optically in conjugation with each other. The divergent bundle of rays emitted from the radiating point A passes through the concave portion and is incident to the optical element. Then, the light is reflected by the reflective surfaces, thereby being converged on the hole, and is emergent from the optical element through the hole.
133 Citations
13 Claims
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1. An optical head device comprising:
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an optical element comprising;
a planar first reflective surface which has a light transmitting portion in its center;
a spheroidal second reflective surface which converges light on the light transmitting portion; and
a concave portion which is located in a center of the second reflective surface and which transmits light; and
a light source which emits a divergent bundle of rays from a point which is a center of the curvature of the concave portion. - View Dependent Claims (2, 3, 4, 5, 6, 7)
an optical fiber; and
a mirror which reflects light emitted from the optical fiber to make the light incident to the concave portion.
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8. A near-field light emitting device comprising:
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a light source which emits a divergent bundle of rays; and
an optical element to which the divergent bundle of rays emitted from the light source is incident and from which near-field light effuses, said optical element comprising;
a planar first reflective surface which has, in its center, a light transmitting portion which has an aperture diameter not more than wavelength of light;
a spheroidal second reflective surface which converges light on the light transmitting portion; and
a concave portion which is located in a center of the second reflective surface and which transmits light. - View Dependent Claims (9, 10, 11, 12, 13)
an optical fiber; and
a mirror which reflects light emitted from the optical fiber to make the light incident to the concave portion.
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Specification