Optical system and image display apparatus
First Claim
1. An image display apparatus, comprising:
- an image display device constructed and arranged to display an image;
an ocular optical system constructed and arranged to lead the image displayed by said image display device to an observer'"'"'s eyeball without forming an intermediate real image; and
a retainer, said retainer retaining both said image display device and said ocular optical system on an observer'"'"'s head or face,said image display device being a transmission type liquid crystal having an illumination unit at a back of it, said image display apparatus satisfying the following condition;
space="preserve" listing-type="equation">Sb>
d>
1 mm (24)wherein Sb is a length of said illumination unit, and d is a distance between said illumination unit and said image display device.
1 Assignment
0 Petitions
Accused Products
Abstract
An optical system which is compact, lightweight and satisfactorily corrected for aberrations and may be suitably used as an imaging optical system or an ocular optical system for a head- or face-mounted image display apparatus which forms no intermediate image. The optical system includes an optical member (7) and a diffraction optical element (8), which are decentered with respect to each other. The optical member (7) has at least three adjacent optical surfaces, at least one of which is a curved surface. At least two reflections take place between the optical surfaces. The space between the optical surfaces is filled with a medium having a refractive index larger than 1. Light rays emitted from an image display device (6) enter the optical member (7) through a first transmitting surface (5) disposed to face the image display device (6) and are reflected by a first reflecting surface (3). The reflected light rays are reflected by a second reflecting surface (4) and led to an observer'"'"'s eyeball through a second transmitting surface (3).
41 Citations
16 Claims
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1. An image display apparatus, comprising:
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an image display device constructed and arranged to display an image; an ocular optical system constructed and arranged to lead the image displayed by said image display device to an observer'"'"'s eyeball without forming an intermediate real image; and a retainer, said retainer retaining both said image display device and said ocular optical system on an observer'"'"'s head or face, said image display device being a transmission type liquid crystal having an illumination unit at a back of it, said image display apparatus satisfying the following condition;
space="preserve" listing-type="equation">Sb>
d>
1 mm (24)wherein Sb is a length of said illumination unit, and d is a distance between said illumination unit and said image display device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An image display apparatus, comprising:
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an image display device constructed and arranged to display an image; an ocular-optical system constructed and arranged to lead the image displayed by said image display device to an observer'"'"'s eyeball without forming an intermediate real image; and a retainer, said retainer retaining both said image display device and said ocular optical system on an observer'"'"'s head or face, said image display device being a transmission type liquid crystal display device having an illumination unit at a back of it, said illumination unit and said image display device being tilted relative to each other such that said illumination unit and said image display device diverge from each other at ends thereof which are remote from said observer'"'"'s eyeball. - View Dependent Claims (14, 15, 16)
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Specification