Optical instrument for observation
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United States of America Patent
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Sep 21, 2004
Grant Date -
Jul 31, 2003
app pub date -
Jan 10, 2003
filing date -
Jan 29, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical instrument for observation includes, in order from the object side, an objective lens system having positive refractive power, an erecting optical system, and an ocular lens system having positive refractive power. When an anti-vibration mechanism is used to maintain the erecting prism at an orientation in space that is stabilized so as to prevent image degradation due to vibrations of the optical instrument for observation, the erecting prism is constructed to satisfy specified conditions so that ghost light is not generated and so that the optical instrument for observation may be compact.
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