Optical system and display apparatus
AssigneeCanon Kabushiki Kaisha
InventorsAkira Yamamoto, Keiichiro Ishihara
Life of this patent
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Abstract
The present disclosure relates to optical system and display apparatus. 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.
Claims16
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 positive lens disposed between the first optical element and the display element;
- 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 positive lens, the transmission surface, the reflection-transmission surface, the reflection surface, the reflection-transmission surface, and the negative lens in this order, and
- wherein the following inequalities are satisfied:
- nn>nm
- φn/φA<−0.05
- φpVn/φnVp<−2
- 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, φA represents an entire optical power of the optical system, φp represents an optical power of the positive lens, Vp represents an Abbe number of the positive lens, and Vn represents an Abbe number of the negative lens.
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 first transmission surface, a reflection-transmission surface, and a reflection surface;
- a negative lens including a concae 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 first transmission surface, the reflection-transmission surface, the reflection surface, the reflection-transmission surface, and the negative lens in this order, and
- wherein the following inequalities are satisfied:
- nn>nm
- (nn−1)/(no−1)>1.3
- 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, and no represents a refractive index of the second optical element at the d-line.
Dependencies are inferred from the claim text.