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US 11,940,623 B2Granted
Observation optical system and display apparatus
AssigneeCanon Kabushiki Kaisha
InventorKazutaka Inoguchi
Life of this patent
Estimating the term…
Abstract
An optical system configured to guide a light beam from a display element includes a positive lens, a negative lens, and an optical element having at least three optical surfaces. The light beam from the display element is reflected a plurality of times inside the optical element via the positive lens and the negative lens, and then travels to an exit pupil. A predetermined condition is satisfied.
Claims8
An optical system configured to guide a light beam from a display element, the optical system comprising:
- a positive lens;
- a negative lens;
- and
- an optical element having a transmission surface, an optical surface, and a reflection and transmission surface,
- wherein the light beam from the display element;
- passes through the positive lens, the negative lens, and then the transmission surface;
- then reflects on the reflection and transmission surface and then on the optical surface;
- then passes through the reflection and transmission surface;
- and
- then travels to an exit pupil, and
- wherein the following inequalities are satisfied:
- 0.28<nn-np<0.60
- 50.26≤vp-vn<80
- where np and nn are refractive indices of the positive lens and the negative lens for the d-line, respectively, and vp and vn are Abbe numbers of the positive lens and the negative lens for the d-line, respectively.
11 more elements
Dependencies are inferred from the claim text.