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US 2022/0018521 A1Published application
Portable lighting device and lighting method
AssigneeDai Nippon Printing Co., Ltd.
InventorsShumpei NISHIO, Kaori NAKATSUGAWA, Makio KURASHIGE, Kazutoshi ISHIDA
Life of this patent
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Abstract
A portable lighting device includes: a coherent light source; a shaping optical system that shapes coherent light emitted from the coherent light source; and a diffractive optical element that diffracts the coherent light shaped by the shaping optical system to a surface to be irradiated (IP). The diffractive optical element is rotatably supported. The surface to be irradiated is lighted in a pattern depending on a diffraction pattern of the diffractive optical element.
Claims25
A portable lighting device comprising:
- a coherent light source;
- and
- a diffractive optical element that diffracts coherent light from the coherent light source to a surface to be irradiated;
- wherein:
- the diffractive optical element is rotatably supported;
- the coherent light incident on the diffractive optical element includes coherent light incident on a position at which a rotation axis line of the diffractive optical element intersects with the diffractive optical element;
- and
- the surface to be irradiated is lighted in a pattern depending on a diffraction pattern of the diffractive optical element.
5 more elements
(canceled)
A lighting method comprising:
- a step adjusting a rotated position of a diffractive optical element of a lighting device based on a surface to be irradiated, wherein the lighting device comprises a coherent light source, and the diffractive optical element that is rotatable with respect to the coherent light source and diffracts coherent light from the coherent light source to a surface to be irradiated;
- and
- a step of lighting the surface to be irradiated in a pattern depending on a diffraction pattern of the diffractive optical element;
- wherein:
- the lighting device is capable of lighting a first surface to be irradiated when the diffractive optical element is located at a predetermined rotated position;
- and
- in the step of adjusting a rotated position of the diffractive optical element,
- when an orientation of a second surface to be irradiated to be lighted is an orientation rotated in the clockwise direction from the first surface to be irradiated, seen from a position of the lighting device, the diffractive optical element is rotated in the clockwise direction from the predetermined rotated position, or
- when an orientation of a second surface to be irradiated to be lighted is an orientation rotated in the counterclockwise direction from the first surface to be irradiated, seen from a position of the lighting device, the diffractive optical element is rotated in the counterclockwise direction from the predetermined rotated position.
6 more elements
(canceled)
Dependencies are inferred from the claim text.