Solid rod dust-proof structure for projecting apparatuses
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United States of America Patent
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May 28, 2002
Grant Date -
N/A
app pub date -
Aug 8, 2000
filing date -
Mar 17, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention discloses a solid rod dust-proof structure for projecting apparatuses. The solid rod includes an incident-beam surface and an outgoing-beam surface. The dust-proof structure includes: a housing provided with a first chamber and a second chamber connecting each other wherein the cross section of the second chamber is greater than that of the first chamber. The first chamber contains the solid rod, and a stopping portion is installed on the opposite end of the second chamber for stopping the solid rod; and a dust-proof plate being a transparent plate is contained in the second chamber to completely cover the outgoing-beam surface of the solid rod. Using the above structure, the outgoing-beam surface of the solid rod can be completely covered by the transparent dust-proof plate so that the structure is free from dust and the light transmitting through the outgoing-beam surface will not be blocked.
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