OPTICAL ELEMENT, EXTENDED OPTICAL ELEMENT COMPRISING OPTICAL ELEMENT, AND LAMP HOUSING
First Claim
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1. An optical element comprising:
- a polygonal column-shaped transparent body which has four inner wall surfaces that surround a rectangular column-shaped space having a square-shaped opening when seen in a plan view, four outer wall surfaces that are respectively parallel to the inner wall surfaces, two outer wall surfaces which are perpendicular to a diagonal line of the square-shaped opening and face each other, and two side wall surfaces that are perpendicularly connected to at least one of the two outer wall surfaces and are connected to at least one of the four outer wall surfaces,wherein, in the transparent body, a distance between the two outer wall surfaces facing each other is longer than the diagonal line, andlight perpendicularly incident on one outer wall surface of the two outer wall surfaces facing each other undergoes repetitive total reflection on the inner wall surfaces and the outer wall surfaces and, finally, exits along almost the same axis as a light axis of light incident through the other outer wall surface of the two outer wall surfaces facing each other.
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Abstract
An optical element is constituted of a polygonal column-shaped transparent body which has four inner wall surfaces that surround a rectangular column-shaped space having a square-shaped opening when seen in a plan view, four outer wall surfaces that are respectively parallel to the inner wall surfaces, and two outer wall surfaces which are perpendicular to a diagonal line of the square-shaped opening and face each other, in which the distance between the two outer wall surfaces facing each other is longer than the diagonal line.
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Citations
15 Claims
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1. An optical element comprising:
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a polygonal column-shaped transparent body which has four inner wall surfaces that surround a rectangular column-shaped space having a square-shaped opening when seen in a plan view, four outer wall surfaces that are respectively parallel to the inner wall surfaces, two outer wall surfaces which are perpendicular to a diagonal line of the square-shaped opening and face each other, and two side wall surfaces that are perpendicularly connected to at least one of the two outer wall surfaces and are connected to at least one of the four outer wall surfaces, wherein, in the transparent body, a distance between the two outer wall surfaces facing each other is longer than the diagonal line, and light perpendicularly incident on one outer wall surface of the two outer wall surfaces facing each other undergoes repetitive total reflection on the inner wall surfaces and the outer wall surfaces and, finally, exits along almost the same axis as a light axis of light incident through the other outer wall surface of the two outer wall surfaces facing each other. - View Dependent Claims (8, 9, 10, 12, 13, 14, 15)
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2. An optical element comprising:
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a main body portion formed by connecting two prismatic bodies having parallelogram-shaped bottom surfaces having inner angles of 45° and
135°
using one side surface of each of the two prismatic bodies as a connection surface so that the 45°
inner angles and the 135°
inner angles of the respective parallelogram-shaped bottom surfaces come close to each other; andat least one cuboid-shaped protrusion portion which protrudes outside from a surface facing the connection surface of the main body portion and has a surface parallel to the facing surface. - View Dependent Claims (3, 4, 11)
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5. An optical element which is formed by disposing two prismatic bodies having parallelogram-shaped bottom surfaces having inner angles of 45°
- and 135°
so that, when seen in a plan view, one of two sides of one prismatic body which constitute the 45°
inner angle is brought into contact with the corresponding side of the other prismatic body so as to form an angle of 90° and
connecting side surfaces of the two prismatic bodies as a single surface to one surface of a parallel plate. - View Dependent Claims (6, 7)
- and 135°
Specification