JPH03105824U

JPH03105824U -

Info

Publication number: JPH03105824U
Application number: JP1328890U
Authority: JP
Priority date: 1990-02-14
Filing date: 1990-02-14
Publication date: 1991-11-01
Anticipated expiration: 2005-02-14
Also published as: JP2532197Y2

Description

[Brief explanation of drawings]

第１図は本考案の１実施例に係るセクタシヤツ
タの駆動力伝達列を示す平面図、第２図は上記ス
テツプモータのモータ取付状態を示す平面図、第
３図は第２図の断面図、第４図は本考案の制御シ
ステムの一例を示すブロツク図、第５図は本考案
の制御動作例を示すフローチヤート、第６図は上
記実施例のタイムチヤート。１ａ……露出用アパーチユア、２，３……セク
タ、４……カムレバー、４ａ……ギア、４ｂ……
カム溝、５……出力ピニオン、６……カム連動レ
バー、６ａ……カムフオロア、１０……ステツプ
モータ、２０，２１……電圧変換回路、２２，２
３……プリセツトカウンタ、２４……ＭＰＵ、２
６……測光回路、２６……モードセレクタ、２９
……停止タイミングカウンタ、３０……反転タイ
ミングカウンタ、３１……発振器、３２……スイ
ツチング回路、３３，３４……パルス切換ゲート
、３５，３６……ゲート切換回路。 FIG. 1 is a plan view showing a driving force transmission train of a sector shutter according to an embodiment of the present invention, FIG. 2 is a plan view showing the step motor installed, and FIG. 3 is a sectional view of FIG. 2. FIG. 4 is a block diagram showing an example of the control system of the present invention, FIG. 5 is a flowchart showing an example of the control operation of the present invention, and FIG. 6 is a time chart of the above embodiment. 1a... Exposure aperture, 2, 3... Sector, 4... Cam lever, 4a... Gear, 4b...
Cam groove, 5... Output pinion, 6... Cam interlocking lever, 6a... Cam follower, 10... Step motor, 20, 21... Voltage conversion circuit, 22, 2
3...Preset counter, 24...MPU, 2
6...Photometering circuit, 26...Mode selector, 29
... Stop timing counter, 30 ... Reverse timing counter, 31 ... Oscillator, 32 ... Switching circuit, 33, 34 ... Pulse switching gate, 35, 36 ... Gate switching circuit.

Claims

[Claims for Utility Model Registration] (1) A plurality of sectors forming exposure openings corresponding to operating positions, a step motor that rotates stepwise in both forward and reverse directions in response to the pulse phase of a drive pulse, and the step motor. A program shutter comprising at least a transmission mechanism for transmitting the rotation of a motor to the plurality of sectors to open and close the sectors, and controlling the rotation of the step motor to control the opening and closing operations of the sectors, field brightness input means for inputting field brightness information; aperture data generating means for generating combination data of aperture diameter and exposure time corresponding to the input field brightness; and one step of the step motor. a reference pulse generation means for generating a reference pulse obtained by dividing the time width of a corner by an integer; a motor drive means for generating a motor drive signal having a multi-planted motor drive signal having a different phase order in synchronization with the reference pulse; and the aperture data generation. Holding the value of the multiplexed motor drive signal generated by the motor drive means at a timing corresponding to the aperture diameter data generated by the means, and at a timing corresponding to the exposure time data generated by the aperture data generation means. and timing control means for reversing the phase order of motor drive signals generated by the motor drive means. (2) The program shutter according to claim 1, wherein the pulse period of the reference pulse generated by the reference pulse generating means is variable.