DIAPHRAGM APPARATUS

WIPO Patent Application WO2010110364

A1

A diaphragm apparatus has a rotary arm and first to fourth diaphragm blades. The rotary arm rotates about a predetermined rotation shaft. The first diaphragm blade is provided with a first pair of sides which are connected to the rotary arm and which are formed to define a V-shaped apex of an obtuse angle so that the first pair of sides come closer to each other as the distance from the rotation shaft increases. The second diaphragm blade is provided with a second pair of sides which are connected to the rotary arm and which are formed to define a V-shaped apex of an obtuse angle so that the second pair of sides come closer to each other as the distance from the rotation shaft decreases. The third diaphragm blade is provided with a third pair of sides which are connected to the rotary arm and which are formed to define a V-shaped apex of an acute angle so that the third pair of sides come closer to each other as the distance from the rotation shaft increases. The fourth diaphragm blade is provided with a fourth pair of sides which are connected to the rotary arm and which are formed to define a V-shaped apex of an acute angle so that the fourth pair of sides come closer to each other as the distance from the rotation shaft decreases. The area of an aperture defined by the first to fourth pairs of sides surrounding the same varies in accordance with the rotation of the rotary arm.

JP4823438

Light intensity adjustment device for cameras

MURAMATSU HIDEAKI (JP)

PCT/JP2010/055206

September 30, 2010

March 25, 2010

Click for automatic bibliography generation  

VICTOR COMPANY OF JAPAN (JP)
MURAMATSU HIDEAKI (JP)

G03B9/02

JPH1062835A	1998-03-06
JP2009031664A	2009-02-12
JPH05241224A	1993-09-21
JP2006178366A	2006-07-06
JP2002162665A	2002-06-07

MIYOSHI, Hidekazu et al. (JP)
Hidekazu Miyoshi (JP)

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