Image display apparatus having rotationally asymmetric phase distribution
AssigneeCanon Kabushiki Kaisha
InventorShoichi Yamazaki
Life of this patent
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Abstract
A prism body has three or more optical surfaces, inclusive of a decentered optical surface with curvature, and has a positive refractive power. The optical surfaces include a diffracting surface having a rotationally asymmetric phase distribution, or the optical surfaces include a diffracting surface having a rotationally symmetric phase distribution on a surface with refractive powers differing depending upon azimuthal angles. An image display apparatus has the prism body and is constructed in such structure that, using the prism body, light from a display displaying image information is guided to the pupil position of an observer to permit the observer to observe the image information displayed on the display.
Claims12
A prism body having a positive refractive power comprising three or more optical surfaces,
- wherein at least one of the optical surfaces is a decentered surface with curvature and comprises a diffracting surface having a rotationally asymmetric phase distribution, and
- wherein said diffracting surface has a symmetric phase distribution on a cross section normal to a cross section in which said optical surface is decentered.
A prism body having a positive refractive power comprising three or more optical surfaces,
- wherein at least one of the optical surfaces is a decentered surface with curvature and comprises a diffracting surface having a rotationally asymmetric phase distribution, and
- wherein at least one of said optical surfaces with curvature has both transmitting action and totally reflecting action.
A prism body having a positive refractive power comprising:
- a first transmitting surface to which light is incident,
- a first reflecting surface which totally reflects light from the first transmitting surface,
- a second reflecting surface which reflects reflected light from the first reflecting surface, and
- a second transmitting surface which has the same shape as the first reflecting surface and which transmits reflected light from the second reflecting surface,
- wherein at least one of the optical surfaces is a decentered surface with curvature and comprises a diffracting surface having a rotationally asymmetric phase distribution.
A prism body having a positive refractive power and having three or more optical surfaces, inclusive of a decentered optical surface with curvature, wherein said optical surfaces comprise a diffracting surface having a rotationally symmetric phase distribution on a surface with refractive powers differing depending upon azimuthal angles.
An image display apparatus comprising:
- a display means for displaying image information;
- and
- an optical system for guiding light from the display means to the pupil position of an observer to permit the observer to observe the image information displayed on the display means,
- wherein said optical system comprises a plurality of decentered reflecting surfaces with curvature and at least one of the surfaces is a diffracting surface having a rotationally asymmetric phase distribution.
An optical system comprising a plurality of decentered, reflecting surfaces with curvature, said optical system comprising a diffracting surface having a rotationally symmetric phase distribution on a surface with refractive powers differing depending upon azimuthal angles.
Dependencies are inferred from the claim text.