Computer generated hologram optical element
First Claim
1. A computer-generated hologram optical element comprising:
- a transmission type Fourier transform hologram comprising a substrate, and an image converting layer formed on the substrate and having a function as a Fourier transform lens;
a diffraction function layer disposed on the image converting layer of the transmission type Fourier transform hologram and having a certain refractive index difference with respect to the image converting layer; and
a protection layer formed on the diffraction function layer.
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Abstract
A main object of the present invention is to provide a computer-generated hologram optical element with little decline of the image converting function even when a pollutant such as oil and water is adhered to the surface. To achieve the object, the present invention provides a computer-generated hologram optical element comprising: a transmission type Fourier transform hologram comprising a substrate, and an image converting layer formed on the substrate and having a function as a Fourier transform lens; a diffraction function layer disposed on the image converting layer of the transmission type Fourier transform hologram and having a certain refractive index difference with respect to the image converting layer; and a protection layer formed on the diffraction function layer.
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Citations
13 Claims
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1. A computer-generated hologram optical element comprising:
- a transmission type Fourier transform hologram comprising a substrate, and an image converting layer formed on the substrate and having a function as a Fourier transform lens;
a diffraction function layer disposed on the image converting layer of the transmission type Fourier transform hologram and having a certain refractive index difference with respect to the image converting layer; and
a protection layer formed on the diffraction function layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13)
- a transmission type Fourier transform hologram comprising a substrate, and an image converting layer formed on the substrate and having a function as a Fourier transform lens;
Specification