Optical system and display apparatus
AssigneeCanon Kabushiki Kaisha
InventorsAkira Yamamoto, Keiichiro Ishihara
Life of this patent
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Abstract
An optical system guides a light beam from a display element to an exit pupil. The optical system includes a first optical element including a transmission surface, a reflection-transmission surface, and a reflection surface, and a negative lens including a concave surface on an exit pupil side. The light beam from the display element heads toward the exit pupil via the transmission surface, the reflection-transmission surface, the reflection surface, the reflection-transmission surface, and the negative lens in this order. A predetermined condition is satisfied.
Claims20
An optical system which guides a light beam from a display element to an exit pupil, the optical system comprising:
- a first optical element including a transmission surface, a reflection-transmission surface, and a reflection surface;
- and
- a negative lens including a concave surface on an exit pupil side,
- wherein the light beam from the display element heads toward the exit pupil via the transmission surface, the reflection-transmission surface, the reflection surface, the reflection-transmission surface, and the negative lens in this order, and
- wherein following inequalities are satisfied:
- nn>nm
- φn/φA<−0.05
- where nn represents a refractive index of the negative lens at a d-line, nm represents a refractive index of the first optical element at the d-line, φn represents an optical power of the negative lens, and φA represents an optical power of the optical system.
An optical system which guides a light beam from a display element to an exit pupil, the optical system comprising:
- a first optical element including a transmission surface, a reflection-transmission surface, and a reflection surface;
- and
- a negative lens including a concave surface on an exit pupil side,
- wherein the reflection-transmission surface and the negative lens are adjacent to each other,
- wherein the light beam from the display element heads toward the exit pupil via the transmission surface, the reflection-transmission surface, the reflection surface, the reflection-transmission surface, and the negative lens in this order, and
- wherein a following inequality is satisfied:
- nn>nm
- where nn represents a refractive index of the negative lens at a d-line, and nm represents a refractive index of the first optical element at the d-line.
An optical system which guides a light beam from a display element to an exit pupil, the optical system comprising:
- a first optical element including a transmission surface, a reflection-transmission surface, and a reflection surface;
- a negative lens including a concave surface on an exit pupil side;
- and
- a second optical element which is a prism disposed between the first optical element and the negative lens,
- wherein the light beam from the display element heads toward the exit pupil via the transmission surface, the reflection-transmission surface, the reflection surface, the reflection-transmission surface, and the negative lens in this order, and
- wherein a following inequality is satisfied:
- nn>nm
- where nn represents a refractive index of the negative lens at a d-line, and nm represents a refractive index of the first optical element at the d-line.
Dependencies are inferred from the claim text.