JP2010281970A5

JP2010281970A5 -

Info

Publication number: JP2010281970A5
Application number: JP2009134324A
Authority: JP
Filing date: 2009-06-03
Publication date: 2012-04-12
Anticipated expiration: 2029-06-03

Description

本発明の一態様による絞り装置は、互いに重なり合う複数の絞り羽根を有する絞り装置において、撮影光学系の光軸を中心とする開口を有した開口部材と、上記開口の外方に設けられた第１の支軸と、上記開口の外方に上記第１の支軸と異なる上記光軸を中心とした周方向の位置に設けられた第２の支軸と、上記第２の支軸と共に上記第１の支軸を挟むように上記開口の外方に上記第１の支軸、及び上記第２の支軸と異なる上記光軸を中心とした周方向の位置に設けられた第３の支軸と、上記第１の支軸より上記光軸内方に配設された第１の駆動軸と、上記第２の支軸より上記光軸内方に配設された第２の駆動軸と、上記第３の支軸より上記光軸内方に配設された第３の駆動軸と、を有し、上記第１の駆動軸、上記第２の駆動軸、及び上記第３の駆動軸を上記光軸回りに往復移動させる駆動部材と、上記絞り羽根の１つであって、上記第１の支軸に回動可能に嵌合された第１の回転孔と、上記第１の駆動軸が嵌入され、上記駆動部材が駆動されることにより上記第１の駆動軸の上記光軸回りの移動量に応じて、該第１の支軸回りの回転量を制御し、被写体光束中に進入可能な第１のカム溝と、を有し、該第１のカム溝により制御された上記第１の支軸回りの回転に伴い、該被写体光束中に進入する第１の絞り羽根と、上記第１の絞り羽根とは異なる上記絞り羽根の１つであって、上記第２の支軸に回転可能に嵌合された第２の回転孔と、上記第２の駆動軸が嵌入され、上記駆動部材が駆動されることにより上記第２の駆動軸の上記光軸回りの移動量に応じて、該第２の支軸回りの回転量を制御し、上記被写体光束中に進入可能な第２のカム溝と、を有し、該第２のカム溝により制御された上記第２の支軸回りの回転に伴い、上記第１の絞り羽根が被写体光束中に進入するのに伴い、上記第１のカム溝の上記被写体光束中の一部を遮光する第２の絞り羽根と、上記第１の絞り羽根、及び上記第２の絞り羽根とは異なる上記絞り羽根の１つであって、上記第３の支軸に回転可能に嵌合された第３の回転孔と、上記第２の駆動軸が嵌入され、上記駆動部材が駆動されることにより上記第３の駆動軸の上記光軸回りの移動量に応じて、該第３の支軸回りの回転量を制御し、上記被写体光束中に進入可能な第３のカム溝と、を有し、上記第１の絞り羽根が被写体光束中に進入するのに伴い、上記第２の絞り羽根では遮光しきれない上記第１のカム溝の残りの上記被写体光束中の未遮光残部を遮光する第３の絞り羽根と、を具備している。 Throttle device according to one aspect of the present invention, the diaphragm device having a plurality of diaphragm blades overlap each other, and an opening member having an opening and centered on the optical axis of the photographing optical system, provided on an outer side of the opening Together with the first support shaft, the second support shaft provided at the circumferential position around the optical axis different from the first support shaft outside the opening, and the second support shaft A third position provided at a circumferential position centering on the optical axis different from the first support shaft and the second support shaft outside the opening so as to sandwich the first support shaft. support shaft and said first drive shaft disposed on the optical axis in the direction from the first support shaft, a second disposed on the optical axis in the direction from the second support shaft a drive shaft, anda third drive shaft disposed on the optical axis in the direction from the third support shaft, said first drive shaft, said second drive shaft, and the second A drive member that reciprocally moves the drive shaft about the optical axis, a first rotary hole that is one of the diaphragm blades and is rotatably fitted to the first support shaft, and the first When the first drive shaft is inserted and the drive member is driven, the amount of rotation of the first drive shaft about the optical axis is controlled according to the amount of movement of the first drive shaft about the optical axis , and the subject A first cam groove that can enter the light beam, and the first cam groove that enters the subject light beam in accordance with the rotation around the first spindle controlled by the first cam groove. A diaphragm blade, one of the diaphragm blades different from the first diaphragm blade, a second rotation hole rotatably fitted to the second support shaft, and the second drive shaft Is inserted, and the drive member is driven to rotate the second drive shaft around the second support shaft in accordance with the amount of movement of the second drive shaft around the optical axis. To control the amount, the second possible approach in the subject light flux having a cam groove, and with the rotation of said controlled by the cam groove of the second second support shaft around the first diaphragm blade is accompanied to enter into the object light beam, and a second diaphragm blade for shielding a part in the subject light flux of the first cam groove, the first diaphragm blade, and the second It is one of the diaphragm blades different from the diaphragm blades, and a third rotation hole that is rotatably fitted to the third support shaft and the second drive shaft are fitted, and the drive member is A third cam groove capable of entering the subject luminous flux by controlling the amount of rotation about the third support shaft in accordance with the amount of movement of the third drive shaft about the optical axis by being driven. And as the first diaphragm blades enter the luminous flux of the subject, the second diaphragm blades cannot shield the light. And comprising a third diaphragm blade for shielding the remaining non-shielding balance in the subject light flux of the first cam groove, the.

Claims

In a diaphragm device having a plurality of diaphragm blades overlapping each other,
An opening member having an opening and centered on the optical axis of the photographing optical system,
A first support shaft provided outside the opening;
A second support shaft provided at a circumferential position around the optical axis different from the first support shaft outside the opening;
A circumferential position around the optical axis different from the first support shaft and the second support shaft outside the opening so as to sandwich the first support shaft together with the second support shaft A third support shaft provided in
A first drive shaft disposed on the optical axis in the direction from the first support shaft, and a second drive shaft disposed on the optical axis in the direction from the second support shaft, anda third drive shaft disposed on the optical axis in the direction from the third support shaft, said first drive shaft, said second drive shaft, and the third drive shaft A drive member that reciprocates around the optical axis;
One of the diaphragm blades, a first rotation hole that is rotatably fitted to the first support shaft, and the first drive shaft are fitted, and the drive member is driven. And a first cam groove capable of controlling the amount of rotation about the first support shaft in accordance with the amount of movement of the first drive shaft about the optical axis and entering the subject luminous flux. A first diaphragm blade that enters the subject luminous flux in accordance with the rotation around the first support shaft controlled by the first cam groove;
One of the diaphragm blades different from the first diaphragm blade, the second rotation hole that is rotatably fitted to the second support shaft, and the second drive shaft are fitted, When the drive member is driven, the amount of rotation of the second drive shaft about the optical axis is controlled in accordance with the amount of movement of the second drive shaft about the optical axis, and the second light can enter the subject luminous flux . Two cam grooves, and as the first diaphragm blades enter the subject luminous flux as the second cam groove rotates around the second support shaft, a second diaphragm blade for shielding a part in the subject light flux of the first cam groove,
The first diaphragm blade and one of the diaphragm blades different from the second diaphragm blade, wherein the third rotation hole is rotatably fitted to the third support shaft; The second drive shaft is inserted and the drive member is driven to control the amount of rotation of the third drive shaft around the optical axis according to the amount of movement of the third drive shaft around the optical axis , A third cam groove capable of entering into the subject luminous flux, and the first diaphragm blade cannot be shielded by the second diaphragm blade as the first diaphragm blade enters the subject luminous flux. a third diaphragm blade for shielding the remaining non-shielding balance in the subject light flux of the cam groove,
A diaphragm device characterized by comprising:

It said portion to shield the non-light shielding remainder of the third diaphragm blades, the diaphragm device according to claim 1, characterized in that it is formed to extend in a convex shape.