Lens device with anti-fogging

Details Lens device with anti-fogging Lens device with anti-fogging

1997-11-10

1999-04-13

Ben, Loha

Optical: systems and elements

Lens

With support

359512, 600109, 600110, 600129, 600130, 348 65, G02B 702, G02B 1104

Patent

active

058943692

ABSTRACT:
An anti-fogging lens device, having a plural number of optical glass lens elements mounted within a lens barrel, including a first lens element located in a foremost position on the side of a subject and a second lens element located behind and at a space from the first lens element. A spacer ring is fitted in the lens barrel to set apart the first and second lens elements by a gap space of a predetermined width. The spacer ring is formed of a material having higher thermal conductivity than the lens elements and, on the inner peripheral side thereof, provided with a moisture depositing surface which is formed in a non-flat shape to increase its surface area. The lens barrel is fitted in a cylindrical member, and a seal pocket, to be packed with a seal material, is formed between the lens barrel and the cylindrical member to stop clearances between these two members with a secure hermetical seal.

REFERENCES:
patent: 4525745 (1985-06-01), Ghaem-Maghami et al.
patent: 4779613 (1988-10-01), Hashiguchi et al.
patent: 4832003 (1989-05-01), Yabe
patent: 4867137 (1989-09-01), Takahashi
patent: 4971035 (1990-11-01), Ito
patent: 4993405 (1991-02-01), Takamura et al.
patent: 5188094 (1993-02-01), Adair
patent: 5557474 (1996-09-01), McCrary

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