Patent ID: 7957063
Filing Date: 2011-06-07
Classification: B29D,G02B

Abstract:
1. A diffractive optical device that comprises a first to third diffractive device elements composed of resins of different materials, and that has a laminated structure, in which the second diffractive device element is bonded between the first diffractive device element and the third diffractive element, characterized in that a first diffractive optical surface is formed by adhering a diffraction grating groove, which is formed on the first diffractive device element, and a diffracting grating groove, which is formed on the second diffractive device element, on a bonding surface of the first diffractive device element and the second diffractive device element, a second diffractive optical surface is formed by adhering a diffraction grating groove, which is formed on the second diffractive device element, and a diffraction grating groove, which is formed on the third diffractive device element, on a bonding surface of the second diffractive device element and the third diffractive device element, both the non-bonded surface of the first diffractive device element and the non-bonded surface of the third diffractive device element are composed of continuous surfaces, and where a refractive index of the first diffractive device element with the d-line is n