JPH0337426U

JPH0337426U -

Info

Publication number: JPH0337426U
Application number: JP9841689U
Authority: JP
Priority date: 1989-08-25
Filing date: 1989-08-25
Publication date: 1991-04-11

Description

[Brief explanation of drawings]

第１図は、この考案の一実施例に係るカメラシ
ヤツタにおけるパルス発生回路の構成を示す回路
図、第２図は、同じくパルス発生回路の他の実施
例の構成を示す回路図、第３図は、カメラのシヤ
ツタの可動片の移動波形に変曲点が現われるパル
ス波形と可動片の移動波形をそれぞれ示す波形図
、第４図は、この考案の一実施例に係るカメラの
シヤツタにおける可動片を駆動するためのパルス
波形と可動片の移動波形との関係を示す波形図、
第５図は、従来のカメラシヤツタを模式的に示す
構成図、第６図ａ〜ｄは、本考案に用いられる電
磁アクチユエータの構成を示す図で、このうち、
第６図ａは、正面断面図、第６図ｂは、同図ａを
より詳細に破断して示す正面断面図、第６図ｃは
、側面断面図、第６図ｄは、平面図である。１，２……シヤツタ羽根、５……アパーチユア
、６，７……軸ピン、８，９……長孔、１０……
電磁アクチユエータ、１１……可動片、１２……
シヤツタ駆動軸、１６……永久磁石、１７……モ
ールドキヤビン、１８……電磁巻線、２１……Ｃ
ＰＵ、２２，２６……トランジスタ、２３，２４
，２７，２８……抵抗、２５……ダイオード。 FIG. 1 is a circuit diagram showing the configuration of a pulse generation circuit in a camera shutter according to one embodiment of the invention, FIG. 2 is a circuit diagram showing the configuration of another embodiment of the pulse generation circuit, and FIG. 3 is a circuit diagram showing the configuration of another embodiment of the pulse generation circuit. , a waveform diagram showing a pulse waveform in which an inflection point appears in the movement waveform of the movable piece of the camera shutter, and a waveform of the movement of the movable piece, respectively. FIG. A waveform diagram showing the relationship between the pulse waveform for driving and the movement waveform of the movable piece,
FIG. 5 is a block diagram schematically showing a conventional camera shutter, and FIGS. 6 a to 6 d are diagrams showing the structure of an electromagnetic actuator used in the present invention.
Figure 6a is a front sectional view, Figure 6b is a more detailed front sectional view of figure a, Figure 6c is a side sectional view, and Figure 6d is a plan view. be. 1, 2...Shaft blade, 5...Aperture, 6,7...Shaft pin, 8,9...Long hole, 10...
Electromagnetic actuator, 11...Movable piece, 12...
Shutter drive shaft, 16...Permanent magnet, 17...Molded cabinet, 18...Electromagnetic winding, 21...C
PU, 22, 26...Transistor, 23, 24
, 27, 28...Resistor, 25...Diode.

Claims

[Scope of utility model registration request]

A plurality of rotatable shutter blades that open and close the aperture of the camera and a permanent magnet magnetically attract the movable piece supporting the base end in one direction, and an electromagnetic winding is energized to attract the permanent magnet. an electromagnetic actuator configured to cancel the magnetic attraction force and magnetically attract the movable piece in a direction opposite to the attraction direction; and an engaging means for connecting the shutter blades so that they are opened and closed by the operation of the movable piece. When opening the shutter blade, a pulse signal is generated that energizes the electromagnetic winding by changing the pulse duty ratio, and a shutter opening waveform is generated by the inertia of the movable piece, the shutter blade, and the engaging means. 1. A camera shutter comprising a pulse generation circuit that generates a pulse signal with a long pulse width near the inflection point so as not to cause an inflection point of the attitude difference.