Ophthalmic optical system, ophthalmic device, and ophthalmic system
AssigneeNikon Corporation
InventorMasahiro MIZUTA
Life of this patent
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Abstract
An optical system is capable observing a peripheral field away from a visual axis and includes a reflection mirror unit forming an image of an examined eye with two concave mirrors in an opposing arrangement facing each other at the examined eye side, this being the upstream side, of a first optical unit and a second optical unit. In the reflection unit there is a conjugate relationship between one focal point thereof and another focal point thereof. By forming an image of the examined eye using the reflection unit a distance can be secured between the examined eye and the optical system and a wide range of the examined eye can be observed.
Claims2
An ophthalmic optical system comprising:
- a reflection unit including a first concave mirror and a second concave mirror;
- and
- a lens unit configured to receive light from the reflection unit, wherein:
- the first concave mirror and the second concave mirror of the reflection unit each include an aperture on an optical axis and have an opposing arrangement to each other in which at least one of a focal point of the first concave mirror or a focal point of the second concave mirror is positioned at the aperture of the other concave mirror, and in which light rays from the focal point of the first concave mirror are reflected by the first concave mirror and the second concave mirror so as to converge as light toward the focal point of the second concave mirror, and
- the lens unit includes an angle conversion lens that is arranged at a position of the aperture of the first concave mirror which is furthest toward an examined eye side of the lens unit, and that converts an angle of wide-angled converging light from the reflection unit to a smaller angle.
2-17. (canceled)
Dependencies are inferred from the claim text.