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Diaphragm device

  • US 4,797,700 A
  • Filed: 06/26/1986
  • Issued: 01/10/1989
  • Est. Priority Date: 06/28/1985
  • Status: Expired due to Term
First Claim
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1. A diaphragm device including two diaphragm blades arranged to be movable in parallel relatively to each other along a common line on a plane at right angle to an optical axis of an optical system and having aperture forming cut portions respectively, said diaphragm device further comprising at least one auxiliary diaphragm blade which is movable along said common line on the same plane as the above-mentioned diaphragm blades and has an aperture forming cut portion of the shape different shape from those of the above-mentioned diaphragm blades and amount of relative movement different from those of the above-mentioned diaphragm blades.

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