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US 8,427,752 B2Granted
Illumination apparatus and microscope having the same
AssigneeOlympus Corporation
InventorsMasahito Dohi, Kenji Kawasaki
Life of this patent
Estimating the term…
Abstract
An illumination apparatus includes a light source and a collimator optical system converting light emitted from the light source to approximately-parallel light. The collimator optical system includes, in an order of proximity to the light source, a first lens having a positive power and including an approximately-flat surface and an aspheric surface, and a second lens having a positive power.
Claims9
An illumination apparatus comprising:
- a light source;
- and
- a collimator optical system which converts light emitted from the light source to approximately-parallel light,
- wherein the collimator optical system consists of two lenses which are, in an order of proximity to the light source, a first lens having a positive power and a second lens having a positive power,
- wherein the first lens comprises, in an order of proximity to the light source, an approximately-flat first surface and an aspheric second surface, and
- wherein a following conditional expression is satisfied:
- FL1<FL2
- where FL1 is a focal length of the first lens, and FL2 is a focal length of the second lens.
5 more elements
Dependencies are inferred from the claim text.