Optical system device
AssigneeScivax Corporation
InventorsAkifumi Nawata, Tomonori Nakamura, Satoru Tanaka
Life of this patent
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Abstract
An optical device is provided which does not need a collimate lens, and which has a high available efficiency of light. The optical device includes a light source unit 1 emitting light with a wavelength λ, and an optical element 2 with a concavo-convex structure including periodical lenses. When n is a natural number equal to or greater than 1, and the size of a k-th (where k is a natural number equal to or greater than 1) pitch from the smallest one among the pitches of the concavo-convex structure is Pk, a distance L1 between the light source unit and the optical element satisfies the following formula 1 for equal to or greater than any one pitch Pk. ( n - 0 . 1 ) P k 2 2 λ ≦ L 1 ≦ ( n + 0 . 1 ) P k 2 2 λ ( 1 )
Claims19
An optical device comprising:
- an optical element comprising a plurality of lenses arranged periodically, the lenses allowing light with a wavelength λ to pass therethrough;
- and
- an emitting unit comprising a light source that emits the light with the wavelength λ to the plurality of lenses,
- wherein when n is a natural number that is equal to or greater than 1, and a size of a k-th (where k is a natural number that is equal to or greater than 1) pitch from a smallest pitch among pitches of the lenses is Pk, a distance L1 between the emitting unit and the optical element satisfies a following equation 1 for equal to or greater than the any one pitch Pk,
- wherein the lenses are aspheric lenses in which boundaries between the lenses are square, rectangular, or hexagonal in a plan view, and
- wherein a normal line overlapping rate of a surface of a lens is equal to or smaller than 10%.
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Dependencies are inferred from the claim text.