Lens device with anti-fogging
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United States of America Patent
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-
Apr 13, 1999
Grant Date -
N/A
app pub date -
Nov 10, 1997
filing date -
Nov 15, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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Family
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