JP2020181090A5 - - Google Patents

Claims (10)

It is a blade drive device that adjusts the size of the opening through which light passes by rotating a plurality of diaphragm blades.
A first opening forming member in which a fixed opening through which light passes is formed,
Multiple diaphragm blades that go in and out of the light passage path,
A drive ring that engages with the diaphragm blades to rotate the diaphragm blades,
A partition member provided between the diaphragm blade and the drive ring in the optical axis direction and arranged outside the engagement portion between the diaphragm blade and the drive ring in the radial direction of the fixed opening is provided. ,
A blade drive device characterized in that movement of the drive ring in the radial direction is restricted by the engaging portion slidingly contacting the edge of the fixed opening or the partition member. The engaging portion is configured by engaging a drive pin provided on the diaphragm blade with an engaging hole provided on the drive ring.
The blade drive device according to claim 1, wherein the drive pin engages with the edge of the fixed opening or the partition member to restrict the movement of the drive ring in the radial direction. The blade drive device according to claim 1, wherein the drive ring has a receiving portion that overlaps the partition member in the optical axis direction. The blade drive device according to claim 1 or 2, wherein the drive ring is sandwiched between the first opening forming member and the partition member in the optical axis direction. The blade driving device includes a second opening forming member and the partition in which the driving ring is arranged so as to accommodate the driving ring, the diaphragm blade and the partition member between the driving ring and the first opening forming member. The blade drive device according to claim 1 , wherein the blade drive device is sandwiched between members. The blade driving device according to claim 3, wherein the receiving portion is provided around an engagement position with the diaphragm blade in the drive ring . The blade drive device according to any one of claims 1 to 6, wherein the drive ring is formed of a sheet material having spring characteristics. The blade according to claim 7, wherein the drive ring is formed of a sheet material having a surface layer to which at least one surface is subjected to a slidability improving treatment, an antistatic treatment, or an antireflection treatment. Drive device. The blade driving device according to claim 8 , wherein the engaging portion rotates while being in sliding contact with the edge of the fixed opening of the first opening forming member. The blade drive device according to any one of claims 1 to 9, wherein any one of the engaging portion between the drive ring and the throttle blade rotates while being in sliding contact with the inner diameter portion of the partition member. ..