Patent
1981-08-10
1982-11-09
Griffin, Donald A.
354 43, G03B 902, G03B 708
Patent
active
043581919
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to an exposure rate controlling mechanism for a camera with a release type electromagnet device.
2. Background Art
There has conventionally been suggested an exposure rate controlling mechanism for a camera with a release type electromagnet device. In such a conventional mechanism, the release type electromagnet device used therein includes a very complicated coupling structure of an iron member and an exposure rate determining member which is controlled to move by an amount determined corresponding to an amount of displacement of the iron member.
The present invention has been suggested to remove such a defect inherent in the conventional exposure rate controlling mechanism for a camera.
DISCLOSURE OF INVENTION
Therefore, it is the object of the present invention to provide an exposure rate controlling mechanism for a camera in which an iron member constituting an exposure rate controlling means and imparted with a repulsive nature against an electromagnet and an exposure rate determining member which is controlled to move by an amount determined corresponding to an amount of displacement of the iron member are coupled to each other organically so that the exposure rate determining member functions to hold pressingly the iron member against the electromagnet.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is an explanatory view showing the set state of an exposure rate controlling mechanism according to an embodiment of the present invention applied as a diaphragm controlling mechanism for a camera, and
FIG. 2 is an explanatory view fragmentarily showing another operation state of the mechanism shown in FIG. 1.
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention will now be described by way of an embodiment in which it is applied as a controlling means of a diaphragm opening degree of a camera with reference to the accompanying drawings.
In the drawings, the numeral 1 denotes an electromagnet in which two pairs of magnetic poles 1a and 1b are wound respectively with two pairs of coils 1c and 1d.
The numeral 2 denotes an iron lever secured to a shaft 3 pivotably and restrained by a spring 4 to rotate in the counterclockwise direction. The iron lever 2 has a bent part 2a and a pair of shafts 2b and 2c planted thereon. The numeral 5 denotes a first iron member pivotably secured to the shaft 2b of the iron lever 2 and forming a counterpart to the magnetic pole 1a of the electromagnet 1. The numeral 6 denotes a second iron member having an elongated groove 6a with which the shaft 2c of the iron lever 2 engages in an idling condition and forming a counterpart to the magnetic pole 1b of the electromagnet 1.
The numeral 7 designates an iron cooperating lever secured to a shaft 8 pivotably and restrained by a weak spring 9 to rotate in the clockwise direction. The iron cooperating lever 7 has a projection 7a through which the lever 7 is brought into contact with the bent part 2a of the iron lever 2. The lever 7 also includes an elongated groove 7b which will be described later. The numeral 10 designates a diaphragm control lever which is engaged in an idling condition with the large diameter part 8a of the shaft 8 through an elongated groove 10a provided therein. The diaphragm control lever 10 has a bent part 10b and a pin 10c planted thereon (this pin 10c extends through the front and back surfaces of the lever 10). The levers 7 and 10 are engaged with each other with the pin 10c of the lever 10 inserted into the elongated groove 7b of the lever 7. A spring 11 is provided between these two levers 7 and 10 so as to pull the diaphragm control lever 10 in the leftward direction in FIG. 1.
The numeral 12 designates a diaphragm operating lever secured pivotably to a shaft 13 and restrained by a spring 14 to rotate in the counterclockwise direction. This lever 12 has a shaft 12a planted thereon. The numeral 15 denotes a diaphragm rate determining lever pivotably secured to the shaft 12a of the diaphragm operating lever 12. This diaphragm rate deter
REFERENCES:
patent: 3491664 (1970-01-01), Ernisse
patent: 3864700 (1975-02-01), Mielke
Griffin Donald A.
Kabushiki Kaisha Copal
Konishiroku Photo Industry Co,., Ltd.
Nilles James E.
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