JPH0375422U

JPH0375422U -

Info

Publication number: JPH0375422U
Application number: JP13713489U
Authority: JP
Priority date: 1989-11-27
Filing date: 1989-11-27
Publication date: 1991-07-29

Description

[Brief explanation of drawings]

第１図は本考案の１実施例に係るレンズシヤツ
タをセクタ側から見た平面図、第２図は上記レン
ズシヤツタの動力伝達機構の平面図、第３図はス
テツプモータの構成例を原理的に示す図、第４図
は２相励磁方式のパルス列を示す図、第５図は開
口波形とフオトインタラプタの出力パルスを示す
タイムチヤート、第６図は１−２相励磁方式のパ
ルス列を示す図。２，３……セクタ、４……セクタ駆動レバー、
６……ステツプモータ、６ａ，６ｂ……フランジ
、９ａ，９ｂ……ボルト、６ｄ……ロータ、６ｅ
，６ｆ……ヨーク、Ｓ１〜Ｓ５……磁極、Ｎ１〜
Ｔ５……磁極、Ａ１〜Ａ５……磁極、１〜５
……磁極、Ｂ１〜Ｂ５……磁極、１〜５……
磁極、９ａ，９ｂ……ボルト、１０ａ，１０ｂ…
…ワツシヤ。 Fig. 1 is a plan view of a lens shutter according to an embodiment of the present invention as seen from the sector side, Fig. 2 is a plan view of the power transmission mechanism of the lens shutter, and Fig. 3 shows the principle of a configuration example of a step motor. 4 is a diagram showing a pulse train of a two-phase excitation method, FIG. 5 is a time chart showing an aperture waveform and an output pulse of a photointerrupter, and FIG. 6 is a diagram showing a pulse train of a 1-2 phase excitation method. 2, 3...Sector, 4...Sector drive lever,
6...Step motor, 6a, 6b...flange, 9a, 9b...bolt, 6d...rotor, 6e
, 6f...Yoke, S1~S5...Magnetic pole, N1~
T5...Magnetic pole, A1-A5...Magnetic pole, 1-5
...Magnetic pole, B1-B5...Magnetic pole, 1-5...
Magnetic poles, 9a, 9b... Bolts, 10a, 10b...
...Watsiya.

Claims

[Claims for Utility Model Registration] (1) A vehicle comprising a sector that serves as both an aperture blade and a shutter blade, and a permanent magnet type step motor with a rotor capable of forward and reverse rotation, and transmits the rotation of the step motor to drive the sector. In a lens shutter that is driven to open and close, the mounting angle of the step motor can be adjusted around its rotation axis, thereby making it possible to adjust the stop phase and the sector position, and adjusting the target travel position of the sector. A lens shutter characterized in that the step motor is arranged to take an even number of steps from an initial phase of the step motor. (2) In the lens shutter according to claim 1, the position where the sector reaches a switching point of a sensor for sector position detection, or the position where the sector reaches a minimum F
A lens shutter characterized in that at least one of the positions at which the value is reached is an even numbered step from the initial phase of the step motor. (3) The lens shutter according to claim 1 or 2, characterized in that the pulses for driving the step motor are of a two-phase excitation type. (4) In a lens shutter, comprising a sector that serves as both an aperture blade and a shutter blade, and a rotor permanent magnet type step motor that can rotate in forward and reverse directions, and the sector is driven to open and close by transmitting the rotation of the step motor. By making the mounting angle of the step motor adjustable around its rotation axis, it is possible to adjust the stop phase and the sector position, and the pulse for driving the step motor is adjusted to 1-2.
A phase excitation method is used, and the initial phase of the step motor is set to a two-phase excitation position, and the target traveling position of the sector is an even-numbered step from the initial phase of the step motor and is set to a two-phase excitation position. A lens shutter that is characterized by: (5) In the lens shutter according to claim 4, the position where the sector reaches a switching point of a sensor for sector position detection, or the position where the sector reaches a minimum F
At least one of the positions at which the value is reached is an even numbered step from the initial phase of the step motor and
A lens shutter characterized by being arranged in a phase excitation position.