BLADE DRIVING DEVICE AND OPTICAL DEVICE

• Main Authors: SHIBATA MITSUO, YOSHIZAWA TAKAHITO
• Format: Patent
• Language: English; Japanese
• Published: 23.03.2017
• Subjects: ACCESSORIES THEREFOR; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES; APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY; PHOTOGRAPHY; PHYSICS

PROBLEM TO BE SOLVED: To provide a small-sized blade driving device which forms a circular light passage aperture from an open state to a small aperture diameter, and to provide an optical device.SOLUTION: The blade driving device comprises an aperture forming member forming an aperture part allowing light to pass therethrough, a blade group disposed around the aperture part of the aperture forming member, a turning member for turning the blade group around the aperture part, first engagement parts provided on the turning member and engaged with the blade group, and second engagement parts provided on the aperture forming member and engaged with the blade group, and is characterized in that a plurality of blade groups are provided and first engagement parts and second engagement parts in the plurality of blade groups overlap each other in an optical axis direction being a normal direction of the aperture part.SELECTED DRAWING: Figure 1 【課題】開放状態から小絞り径まで、円形な光通過開口を形成し、且つ、小型な羽根駆動装置及び光学装置を提供する。【解決手段】光が通過する開口部を形成する開口形成部材と、前記開口形成部材の前記開口部の周囲に配置される羽根群と、前記羽根群を前記開口部の周囲で回動させる回動部材と、前記回動部材に設けられ、前記羽根群に係合する第一係合部と、前記開口形成部材に設けられ、前記羽根群に係合する第二係合部とを備え、前記羽根群を複数有し、前記複数の羽根群における前記第一係合部および前記第二係合部が、前記開口部の法線方向である光軸方向において重なることを特徴とする。【選択図】図１