Image combiner and image display unit
First Claim
1. An image combiner in which a reflective type hologram optical element is installed, and light from the outside world is superimposed on light from image display means, this image combiner being characterized in that the light that is emitted from the image display means has wavelength region components that respectively extend before and after one or more peak wavelengths, and the wavelength λ
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o and wavelength λ
y are different where λ
o is the wavelength at which the diffraction efficiency shows a maximum value in the wavelength region in the vicinity of a single peak wavelength among the one or more peak wavelengths after the chief rays that are emitted from the center of the display part of the image display means are diffracted by the reflective type hologram optical element, and λ
y is the wavelength at which the diffraction efficiency shows a maximum value in the wavelength region in the vicinity of this single peak wavelength among the one or more peak wavelengths after the chief rays that are emitted from the peripheral portions of the display part are diffracted by the reflective type hologram optical element.
1 Assignment
0 Petitions
Accused Products
Abstract
During use, a plate-form part 5 which is constructed from an optical material and which corresponds to a spectacle lens is positioned in front of the eye of the user which is disposed in the vicinity of the exit pupil P of an image combiner 1. The combiner 1 causes light from an image display element 2 to be superimposed on light that is transmitted through the plate-form part 5 so as to pass through the thickness of the plate-form part 5 from the front of the plate-form part 5, and conducts this light to the eye. The light from the image display element 2 reaches the eye of the user after being diffracted and reflected by a reflective type HOE 6 inside the plate-form part 5. The wavelength at which the diffraction efficiency shows a maximum value when the chief rays that are emitted from the center of the display part of the image display element 2 are diffracted and reflected by the reflective type HOE 6 and the wavelength at which the diffraction efficiency shows a maximum value when the chief rays that are emitted from the peripheral portions of the display part in a specified direction are diffracted and reflected by the reflective type HOE 6 are substantially different. As a result, it is possible to improve the image quality of the display images that are obtained in cases where the center of the pupil of the eye of the user deviates from the center of the exit pupil of the image combiner.
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Citations
20 Claims
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1. An image combiner in which a reflective type hologram optical element is installed, and light from the outside world is superimposed on light from image display means, this image combiner being characterized in that the light that is emitted from the image display means has wavelength region components that respectively extend before and after one or more peak wavelengths, and
the wavelength λ -
o and wavelength λ
y are differentwhere λ
o is the wavelength at which the diffraction efficiency shows a maximum value in the wavelength region in the vicinity of a single peak wavelength among the one or more peak wavelengths after the chief rays that are emitted from the center of the display part of the image display means are diffracted by the reflective type hologram optical element, andλ
y is the wavelength at which the diffraction efficiency shows a maximum value in the wavelength region in the vicinity of this single peak wavelength among the one or more peak wavelengths after the chief rays that are emitted from the peripheral portions of the display part are diffracted by the reflective type hologram optical element. - View Dependent Claims (2, 3, 4, 5, 14, 15, 16, 17, 18, 19, 20)
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o and wavelength λ
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6. An image display device comprising image display means and a light conducting part that conducts light from the image display means to the eye of the user, this image display device being characterized in that:
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the light conducting part has a reflective type hologram optical element, the light that is emitted from the image display means has wavelength region components that respectively extend before and after one or more peak wavelengths, and the wavelength λ and
wavelength λ
y are differentwhere λ
o is the wavelength at which the diffraction efficiency shows a maximum value in the wavelength region in the vicinity of a single peak wavelength among the one or more peak wavelengths after the chief rays that are emitted from the center of the display part of the image display means are diffracted by the reflective type hologram optical element, andλ
y is the wavelength at which the diffraction efficiency shows a maximum value in the wavelength region in the vicinity of the single peak wavelength after the chief rays that are emitted from the peripheral portions of the display part are diffracted by the reflective type hologram optical element. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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Specification