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US 10,705,263 B2Granted
Lens system and variable focal length lens apparatus
AssigneeMitutoyo Corporation
InventorsAtsushi Usami, Masaki Okayasu
Life of this patent
Estimating the term…
Abstract
A lens system includes a tubular vibrating member that vibrates due to an input drive signal; a case accommodating the vibrating member; a fluid that fills the case and immerses the vibrating member; and a pressure mitigating member that is installed in a gap between the vibrating member and the case, further outward than the vibrating member. A foam body made of fluororubber and having a large number of closed cells is used as the pressure mitigating member.
Claims8
A lens system comprising:
- a tubular vibrator that vibrates due to an input drive signal;
- a case accommodating the vibrator and including a fluid immersing the vibrator, the fluid extending from a first inner end of the case to a second inner end of the case;
- and
- a pressure mitigator installed in a gap between the vibrator and the case, at a position further outward than the vibrator in a radial direction extending from a longitudinal axis of the case, said pressure mitigator being in contact with the fluid.
1 more element
A variable focal length lens apparatus comprising:
- a lens system wherein a refractive index changes in response to an input drive signal;
- a field lens arranged on the same optical axis as the lens system;
- an image detector that detects an image of a measurable object through the lens system and the field lens;
- and
- a pulse illuminator that provides pulse illumination of the measurable object based on an input light emission signal;
- wherein the lens system comprises:
- a tubular vibrator that vibrates due to an input drive signal;
- a case accommodating the vibrator and including a fluid immersing the vibrator, the fluid extending from a first inner end of the case to a second inner end of the case;
- and
- a pressure mitigator installed in a gap between the vibrator and the case, at a position further outward than the vibrator in a radial direction extending from a longitudinal axis of the case, said pressure mitigator being in contact with the fluid.
7 more elements
Dependencies are inferred from the claim text.