JPH0421198U

JPH0421198U -

Info

Publication number: JPH0421198U
Application number: JP6162790U
Authority: JP
Priority date: 1990-06-11
Filing date: 1990-06-11
Publication date: 1992-02-21

Description

[Brief explanation of drawings]

第１図ないし第５図は本考案に係るカメラ用ス
テツプモータの第１実施例を示す図であり、第１
図はその全体構成図、第２図はこのカメラ用ステ
ツプモータの作動を示すフローチヤート、第３図
はこの制御回路から出力するパルス信号の波形図
、第４図ａ，ｂ，ｃはこのロータの回転駆動を示
す図、第５図は制御回路の詳細図である。第６図
は本考案に係るカメラ用ステツプモータの第２実
施例を示す図であり、詳しくはその作動を示すフ
ローチヤート。第７図は本考案に係るカメラ用ス
テツプモータの第３実施例を示す全体構成図であ
る。第８図ないし第１０図は従来のカメラ用ステ
ツプモータを示す図であり、第８図はこのモータ
の平面図、第９図はこの制御回路から出力するパ
ルス信号の波形図、第１０図ａ，ｂ，ｃはこのロ
ータの回転駆動を示す図である。１……撮影レンズ、２……レンズ枠、３……レ
ンズ駆動カム、５……出力ギア、６……ピニオン
、９〜１２……磁極部、１３……駆動回路、１４
……制御回路、１５……測距部、Ｒ……ロータ、
Ｓａ，Ｓｂ……ステータ、Ｌａ，Ｌａ……電磁コ
イル。 1 to 5 are diagrams showing a first embodiment of a step motor for a camera according to the present invention.
Figure 2 is a flowchart showing the operation of this camera step motor, Figure 3 is a waveform diagram of pulse signals output from this control circuit, and Figures 4 a, b, and c are diagrams of this rotor. FIG. 5 is a detailed diagram of the control circuit. FIG. 6 is a diagram showing a second embodiment of the camera step motor according to the present invention, and in detail is a flowchart showing its operation. FIG. 7 is an overall configuration diagram showing a third embodiment of a step motor for a camera according to the present invention. Figures 8 to 10 are diagrams showing a conventional step motor for a camera. Figure 8 is a plan view of this motor, Figure 9 is a waveform diagram of a pulse signal output from this control circuit, and Figure 10 is a. , b, and c are diagrams showing the rotational drive of this rotor. DESCRIPTION OF SYMBOLS 1... Photographing lens, 2... Lens frame, 3... Lens drive cam, 5... Output gear, 6... Pinion, 9-12... Magnetic pole part, 13... Drive circuit, 14
...Control circuit, 15...Distance measuring section, R...Rotor,
Sa, Sb...stator, La, La...electromagnetic coil.

Claims

[Claims for Utility Model Registration] (1) A step motor for a camera that drives a drive member that moves a photographic lens to a focusing position or operates a sector mechanism, which is rotatably supported and extends in the radial direction. A rotor consisting of multi-pole magnetized permanent magnets, a plurality of stators arranged opposite to this rotor, a two-phase electromagnetic coil wound around this stator, and a two-phase electromagnetic coil At least one of the two-phase electromagnetic coils is equipped with a circuit that can be energized independently under predetermined conditions.
A step motor for a camera, characterized in that two-phase excitation is performed by changing energization conditions in stages. (2) The two-phase electromagnetic coil is excited in two phases in most of the drive range of the drive member, and the stop position of the drive member is set based on at least information such as object distance and object brightness. Claim (1) characterized in that, in the range from immediately before to this stop position, at least one of the two-phase electromagnetic coils is energized by changing the energization condition in stages to perform two-phase excitation.
Step motor for the camera described. (3) At least one of the two-phase electromagnetic coils is subjected to two-phase excitation with the energization condition changed stepwise during at least part of the forward stroke of the drive range of the drive member, and during the backward stroke of the drive range. Claim (1) characterized in that a two-phase electromagnetic coil is excited in two phases.
) Step motor for cameras.