Diffractive light projection device
AssigneeEverready Precision Ind. Corp.
InventorsCHENG-HUNG CHI, CHIH-MING YEN
Life of this patent
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Abstract
A diffractive light projection device includes a light source and a diffractive optical module. The light source emits a light beam. After the light beam passes through the diffractive optical module, a diffractive light is outputted from the diffractive optical module. The diffractive optical module includes plural diffractive optical elements, which are arranged in a stack form and made of different materials. Consequently, a usable wavelength range of the light beam is expanded. Since the usable wavelength range of the light beam to be incident on the diffractive optical module is expanded, the degree of freedom for designing the diffractive optical module is increased.
Claims18
A diffractive light projection device, comprising:
- a light source emitting a light beam;
- and
- a diffractive optical module, wherein after the light beam passes through the diffractive optical module, a diffractive light is outputted from the diffractive optical module, wherein the diffractive optical module comprises a first diffractive optical element and a second diffractive optical element, and the first diffractive optical element and the second diffractive optical element are arranged in a stack form and made of different materials, so that a usable wavelength range of the light beam is expanded.
A diffractive light projection device, comprising:
- a light source emitting a light beam;
- and
- a diffractive optical module, wherein after the light beam passes through the diffractive optical module, a diffractive light is outputted from the diffractive optical module, wherein the diffractive optical module comprises a first diffractive optical element and a second diffractive optical element, and the first diffractive optical element and the second diffractive optical element are arranged in a stack form and made of different materials, wherein a usable wavelength range of the light beam is a range between a first wavelength and a second wavelength, a difference between the second wavelength and the first wavelength is at least 50 nm, and a diffraction efficiency difference of the diffractive optical module with respect to any two wavelengths in the usable wavelength range is smaller than 0.5%.
Dependencies are inferred from the claim text.