Optical system and display apparatus
AssigneeCanon Kabushiki Kaisha
InventorYoshihisa TASHIRO
Life of this patent
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Abstract
An optical system may guide image light from a display element toward an observation side, and may include a cemented lens including at least three lenses cemented together that include a negative lens, and a first transmissive reflective surface and a second transmissive reflective surface, each having a concave shape on the observation side in a paraxial region. At least one of the first transmissive reflective surface and the second transmissive reflective surface may be disposed on a cemented surface of the cemented lens. Predetermined inequalities are satisfied.
Claims10
An optical system that guides image light from a display element toward an observation side, the optical system comprising:
- a cemented lens including at least three lenses cemented together that include a negative lens;
- and
- a first transmissive reflective surface and a second transmissive reflective surface, each having a concave shape on the observation side in a paraxial region,
- wherein at least one of the first transmissive reflective surface and the second transmissive reflective surface is disposed on a cemented surface of the cemented lens,
- wherein the image light is guided toward the observation side via transmission through the second transmissive reflective surface, reflection on the first transmissive reflective surface, reflection on the second transmissive reflective surface, and transmission through the first transmissive reflective surface, and
- wherein the following inequalities are satisfied:
- 10.
- ≤
- vdGn
- ≤
- 50.
- -
- 10.
- ≤
- fGn
- /
- f
- ≤
- -
- 1.
- 0.
- <
- R_HM2
- /
- R_HM1
- ≤
- 1.
- where vdGn is an Abbe number of the negative lens based on d-line, fGn is a focal length of the negative lens in air, f is a focal length of the optical system, R_HM1 is a paraxial radius of curvature of the first transmissive reflective surface, and R_HM2 is a paraxial radius of curvature of the second transmissive reflective surface.
An optical system that guides image light from a display element toward an observation side, the optical system comprising:
- a cemented lens including at least three lenses cemented together that include a negative lens;
- and
- a first transmissive reflective surface and a second transmissive reflective surface, each having a concave shape on the observation side in a paraxial region,
- wherein at least one of the first transmissive reflective surface and the second transmissive reflective surface is disposed on a cemented surface of the cemented lens, and
- wherein the image light is guided toward the observation side via transmission through the second transmissive reflective surface, reflection on the first transmissive reflective surface, reflection on the second transmissive reflective surface, and transmission through the first transmissive reflective surface.
A display apparatus comprising:
- a display element;
- and
- an optical system that guides image light from the display element toward an observation side,
- wherein the optical system includes:
- a cemented lens including at least three lenses cemented together that include a negative lens;
- and
- a first transmissive reflective surface and a second transmissive reflective surface, each having a concave shape on the observation side in a paraxial region,
- wherein at least one of the first transmissive reflective surface and the second transmissive reflective surface is disposed on a cemented surface of the cemented lens,
- wherein the image light is guided toward the observation side via transmission through the second transmissive reflective surface, reflection on the first transmissive reflective surface, reflection on the second transmissive reflective surface, and transmission through the first transmissive reflective surface, and
- wherein the following inequalities are satisfied:
- 10.
- ≤
- vdGn
- ≤
- 50.
- -
- 10.
- ≤
- fGn
- /
- f
- ≤
- -
- 1.
- 0.
- <
- R_HM2
- /
- R_HM1
- ≤
- 1.
- where vdGn is an Abbe number of the negative lens based on d-line, fGn is a focal length of the negative lens in air, f is a focal length of the optical system, R_HM1 is a paraxial radius of curvature of the first transmissive reflective surface, and R_HM2 is a paraxial radius of curvature of the second transmissive reflective surface.
Dependencies are inferred from the claim text.