JPH0459830U

JPH0459830U -

Info

Publication number: JPH0459830U
Application number: JP10378190U
Authority: JP
Priority date: 1990-10-01
Filing date: 1990-10-01
Publication date: 1992-05-22

Description

[Brief explanation of the drawing]

第１図Ａは遮閉状態によるカメラ用シヤツタの
模式的平面図、第１図Ｂは開放状態にあるカメラ
用シヤツタの模式的平面図、第２図はカメラ用シ
ヤツタの模式的断面図、第３図はカメラ用シヤツ
タに駆動力源として用いられる電歪素子の駆動回
路図、及び第４図はカメラ用シヤツタの動作を説
明する為の波形図である。１……露出開口、２……基板、３……遮光羽根
、４……遮光羽根、５……軸ピン、６……長溝、
７……長溝、９……レバー部材、１０……窓部、
１１……作動ピン、１２……作動ピン、１３……
軸ピン、１４……係合部、１５……電歪素子、１
８……自由端、１９……弾性部材。 FIG. 1A is a schematic plan view of the camera shutter in the closed state, FIG. 1B is a schematic plan view of the camera shutter in the open state, FIG. 2 is a schematic cross-sectional view of the camera shutter, and FIG. FIG. 3 is a driving circuit diagram of an electrostrictive element used as a driving force source in a camera shutter, and FIG. 4 is a waveform diagram for explaining the operation of the camera shutter. DESCRIPTION OF SYMBOLS 1... Exposure opening, 2... Substrate, 3... Light-shielding blade, 4... Light-shielding blade, 5... Shaft pin, 6... Long groove,
7...Long groove, 9...Lever member, 10...Window part,
11... Actuation pin, 12... Actuation pin, 13...
Axial pin, 14... Engaging portion, 15... Electrostrictive element, 1
8...Free end, 19...Elastic member.

Claims

[Scope of Claim for Utility Model Registration] 1. A substrate having an exposure aperture, a light-shielding blade disposed on the substrate so as to be retractable from the exposure aperture, and a light shielding blade movable back and forth in an opening direction and a closing direction on the substrate. a lever member that is supported and operates the light-shielding blade to open and close the exposure opening; and a lever member that is electrostrictively displaced in the forward direction by voltage application to drive the lever member in the opening direction and return in the reverse direction. An electrostrictive element for driving the lever member in the closing direction by displacement; and an elasticity for biasing the lever member in the closing direction to control the driving of the lever member in the closing direction by the electrostrictive element. A camera shutter consisting of parts. 2. The camera shutter according to claim 1, wherein the elastic member has a biasing force effective to substantially prevent a delay from the start of the return displacement of the electrostrictive element to the start of the closing direction of the lever member. 3. The camera according to claim 1, wherein the elastic member has an effective biasing force for accelerating the rotation in the closing direction of the lever member driven by the electrostrictive element that returns to its original position in response to removal of the applied voltage. Shyatsuta. 4. The camera shutter according to claim 1, wherein the elastic member has an effective biasing force to hold the lever member at a predetermined rest position regardless of residual strain remaining in the electrostrictive element after the return displacement.