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US 11,237,354 B2Granted
Variable focal length lens apparatus
AssigneeMitutoyo Corporation
InventorsTatsuya Nagahama, Koji Kubo, Yuko Shishido, Masaki Okayasu, Atsushi Usami
Life of this patent
Estimating the term…
Abstract
A variable focal length lens apparatus includes an objective lens and an imaging lens that are aligned on the same optical axis; a front side lens system and a rear side lens system that are disposed in a section between the objective lens and the imaging lens on the optical axis, and change a refractive index in accordance with an input drive signal; and a diaphragm disposed in the section between the front side lens system and the rear side lens system on the optical axis.
Claims2
A variable focal length lens apparatus comprising:
- an objective lens and an imaging lens that are both aligned along a same optical axis;
- a front side lens system and a rear side lens system that are disposed along the optical axis in a section between the objective lens and the imaging lens, and that change a refractive index in accordance with an input drive signal;
- and
- a diaphragm disposed in the section between the front side lens system and the rear side lens system along the optical axis, wherein
- the front side lens system and the rear side lens system are separated by a predetermined distance that remains constant when the refractive index of the front side lens system and the rear side lens system changes in accordance with the input drive signal.
2 more elements
Dependencies are inferred from the claim text.