Electromagnetically operated diaphragm shutter

Claim 2

An electromagnetically operated diaphragm shutter including: (a) a plurality of shutter blades; (b) a sector ring drivingly connected to said shutter blades and operative upon rotation thereof to actuate said shutter blades to block and unblock a photo-taking light path; (c) permanent magnet members oriented relative to said sector ring to form a magnetic field having a direction parallel to the optical axis of an objective lens; (d) electrically conductive members fixedly mounted on said sector ring and arranged upon supply of a current thereto to effect movement of said ring; (e) aperture means provided through the wall of said sector ring to form a light metering optical path, said aperture means being located out of axial alignment with said conductive members on said sector ring; and (f) diaphragm means positioned in the light metering optical path, with at least one of said shutter blades serving as said diaphragm means, and with the size of an opening defined by said diaphragm means being correlated to the size of an aperture opening defined at any time by said shutter blades.

Claim 3

An electromagnetically operated diaphragm shutter according to claim 1, wherein said sector ring is provided with additional aperture means arranged to compensate for unevenness of weight distribution of said sector ring due to the provision of said aperture means in said sector ring.

Claim 4

An electromagnetically operated diaphragm shutter according to claim 2, further including a stationary part and a stopper fixedly mounted on said stationary part of said shutter and arranged upon abutment against a side of said aperture means in said sector ring to define at least one terminal end of the path of movement of said sector ring.

Claim 5

An electromagnetically operated diaphragm shutter according to claim 2, operatively associated with a camera including a flash device and lever means responsive to film sensitivity information and object distance information, said shutter further including a camming surface formed in a portion of said aperture means and cooperative with said lever means for adjusting the position of said sector ring in accordance with said film sensitivity information and said object distance information.

Claim 6

An electromagnetically operated diaphragm shutter according to claim 1, wherein said conductive members comprise at least one coil member defining an air core formed on said sector ring, said coil member being arranged so that said light metering optical path passes through the air core of said coil member.

Claim 7

An electromagnetically operated diaphragm shutter according to claim 1, wherein said conductive members comprise a printed coil pattern formed on said sector ring.

Claim 8

An electromagnetically operated diaphragm shutter according to claim 6, wherein said printed coil pattern is formed on the upper and lower surfaces of said sector ring with the same pattern.

Claim 9

An electromagnetically operated diapragm shutter according to claim 1, wherein at least one of said shutter blades and said sector ring is composed of a non-magnetic material.

Claim 10

An electromagnetically operated diaphragm shutter according to claim 8, wherein the front surface of each of said shutter blades is coated with a metal layer.

Claim 11

An electromagnetically operated diaphragm shutter according to claim 8 in which the conductive members are fixed to the sector ring by thermoplastic material and covered with said thermoplastic material.

Claim 12

An electromagnetically operated exposure control device comprising: (a) a plurality of blades; (b) a rotor drivingly connected to said blades and operative upon rotation thereof to actuate said blades to control the amount of light passing through a photo-taking light path; (c) electrically conductive members fixedly mounted on both sides of said rotor; (d) a magnetic member oriented relative to said rotor to form a magnetic field having a predetermined direction relative to said electrically conductive members; and (e) a plurality of holes provided through the wall of said rotor, said holes being located symmetrically at positions other than the positions of said conductive members on said rotor, said conductive members on both sides of said rotor being connected with each other at least at one of said holes.

Claim 13

An electromagnetically operated exposure control device comprising: (a) a plurality of blades; (b) a rotor drivingly connected to said blades and operative upon rotation thereof to actuate said blades to control the amount of light passing through a photo-taking light path; (c) electrically conductive members fixedly mounted on both sides of said rotor; (d) a magnetic member oriented relative to said rotor to form a magnetic field having a predetermined direction relative to said electrically conductive members; and (e) a plurality of holes provided through the wall of said rotor, said holes being located symmetrically at positions other than the positions of said conductive members on said rotor, said conductive members on both sides of said rotor being connected with each other at least at one of said holes.

Claim 14

A device according to claim 11, wherein one of said plurality of holes defines a light metering optical path extending therethrough.

Claim 15

A device according to claim 11, wherein said plurality of holes are arranged to correct uneven weight distribution of said rotor.

Claim 16

A device according to claim 11 wherein said conductive members include a printed circuit coil pattern formed on said rotor.

Claim 17

A device according to claim 13 wherein said magnetic member is a permanent magnet.

Claim 18

A device according to claim 13 wherein said plurality of holes are arranged symmetrically in relation to the center of rotation of said rotor.

Claim 19

A device according to claim 11 wherein said electrically conductive members are arranged around the center of rotation of said rotor closer thereto and away therefrom in a wave-like fashion relative to the center of rotation.

Claim 20

A device according to claim 11 wherein said conductive members are arranged to encompass the center of rotation of said rotor without overlapping each other.

Claim 21

A device according to claim 11 wherein said device is a diaphragm shutter device.

Claim 22

A device according to claim 13 wherein a hole is provided in the center of rotation of said rotor.

Claim 23

A device according to claim 20 wherein said photo-taking light path extends through said hole provided in the center of rotation of said rotor.

Claim 24

A device according to claim 21 wherein the center of rotation of said rotor coincides with said photo-taking light path.

Claim 25

An electromagnetically operated exposure control device comprising: (a) a plurality of blades; (b) a rotor drivingly connected to said blades and operative upon rotation thereof to actuate said blades to control the amount of light passing through a photo-taking light path; (c) electrically conductive members fixedly mounted on both sides of said rotor; (d) a magnetic member oriented relative to said rotor to form a magnetic field having a predetermined direction relative to said electrically conductive members; (e) a plurality of holes provided through the wall of said rotor, said holes being located symmetrically at positions other than the positions of said conductive members on said rotor, said conductive members on both sides of said rotor being connected with each other at least at one of said holes; and (f) a member which is provided with an aperture for an auxiliary stop, said member being secured to the exposure control device, said auxiliary stop aperture being arranged to overlap one of said plurality of holes.

Claim 26

An electromagnetically operated exposure control device comprising: (a) a plurality of blades; (b) a rotor drivingly connected to said blades and operative upon rotation thereof to actuate said blades to control the amount of light passing through a photo-taking light path; (c) electrically conductive members fixedly mounted on both sides of said rotor; (d) a magnetic member oriented relative to said rotor to form a magnetic field having a predetermined direction relative to said electrically conductive members; (e) a plurality of holes provided through the wall of said rotor, said holes being located symmetrically at positions other than the positions of said conductive members on said rotor, said conductive members on both sides of said rotor being connected with each other at least at one of said holes; and (f) a member which is provided with an aperture for an auxiliary stop, said member being secured to the exposure control device, said auxiliary stop aperture being arranged to overlap one of said plurality of holes.

Claim 27

A device according to claim 23 wherein there is provided an auxiliary stop member which is capable of covering said aperture provided for the auxiliary stop.

Claim 28

A device according to claim 24 wherein the size of an opening defined by said auxiliary stop member is correlated to the size of an opening defined by said blades.

Claim 29

A device according to claim 25 wherein said auxiliary stop member is arranged to be displaced in accordance with displacement of said blades.

Claim 30

A device according to claim 26 wherein at least one of said blades also serves as said auxiliary stop member.

Claim 31

A device according to claim 25 wherein a part of said rotor is arranged to serve as said auxiliary stop member.

Claim 32

An electromagnetically operated exposure control device comprising: (a) a plurality of blades; (b) a rotor drivingly connected to said blades and operative upon rotation thereof to actuate said blades to control the amount of light passing through a photo-taking light path; (c) electrically conductive members fixedly mounted on said rotor, said conductive members being arranged to encompass the center of rotation of said rotor in a wave-like fashion relative to the center of rotation, one being disposed closer thereto and another further away therefrom; (d) a magnetic member oriented relative to said rotor to form a magnetic field having a predetermined direction relative to said electrically conductive members; and (e) a plurality of cutouts provided in the wall of said rotor located along the pattern of said wave-like arrangement of said conductive members but without being in contact with said conductive members.

Claim 33

An electromagnetically operated exposure control device comprising: (a) a plurality of blades; (b) a rotor drivingly connected to said blades and operative upon rotation thereof to actuate said blades to control the amount of light passing through a photo-taking light path; (c) electrically conductive members fixedly mounted on said rotor, said conductive members being arranged to encompass the center of rotation of said rotor in a wave-like fashion relative to the center of rotation, one being disposed closer thereto and another further away therefrom; (d) a magnetic member oriented relative to said rotor to form a magnetic field having a predetermined direction relative to said electrically conductive members; and (e) a plurality of cutouts provided in the wall of said rotor located along the pattern of said wave-like arrangement of said conductive members but without being in contact with said conductive members.

Claim 34

A device according to claim 29 wherein one of said plurality of cutouts has a light metering optical path defined through the inside thereof.

Claim 35

A device according to claim 29 wherein said plurality of cutouts are arranged to correct uneven weight distribution of said rotor.

Claim 36

A device according to claim 29 wherein said conductive members include a printed circuit coil pattern formed on said rotor.

Claim 37

A device according to claim 29 wherein said magnet is a permanent magnet.

Claim 38

A device according to claim 29 wherein said plurality of cutouts are arranged symmetrically in relation to the center of rotation of said rotor.

Claim 39

A device according to claim 29 wherein said conductive members are arranged to encompass the center of rotation of said rotor without overlapping each other.

Claim 40

A device according to claim 29 wherein said device comprises a diaphragm shutter device.

Claim 41

A device according to claim 29 wherein a hole is provided at the center of rotation of said rotor.

Claim 42

A device according to claim 37 wherein said photo-taking light path extends through said hole provided in the center of rotation of said rotor.

Claim 43

A device according to claim 38 wherein the center of rotation of said rotor coincides with said photo-taking light path.

Claim 44

A device according to claim 29 further including a member which is provided with an aperture for an auxiliary stop, said member being secured to the exposure control device, said auxiliary stop aperture being arranged to overlap one of said plurality of cutouts.

Claim 45

A device according to claim 40 wherein there is provided an auxiliary stop member which is capable of covering said aperture provided for the auxiliary stop.

Claim 46

A device according to claim 41 wherein the size of an opening defined by said auxiliary stop member is correlated to the size of an opening defined by said blades.

Claim 47

A device according to claim 42 wherein said auxiliary stop member is arranged to be displaced in accordance with displacement of said blades.

Claim 48

A device according to claim 43 wherein at least one of said blades also serves as said auxiliary stop member.

Claim 49

A device according to claim 42 wherein a part of said rotor is arranged to serve as said auxiliary stop member.

Claim 50

An electromagnetically operated diaphragm shutter including: (a) a plurality of shutter blades; (b) a rotor drivingly connected to said shutter blades and operative upon rotation thereof to actuate said shutter blades to block and unblock a photo-taking light path; (c) electrically conductive members fixedly mounted on said rotor; (d) a magnetic member oriented relative to said rotor to form a magnetic field having a predetermined direction relative to said electrically conductive members; (e) a cutout provided through the wall of said rotor to permit a light metering optical path to extend therethrough, said cutout being located at positions other than the position of said conductive members on said rotor; (f) a member provided with an aperture for an auxiliary stop, said member being fixedly attached to said shutter, and said aperture being arranged to overlap said cutout provided in said rotor; and (g) diaphragm means positioned in the light metering optical path, said diaphragm means being arranged to define an opening of a size correlated to the size of an opening defined by said shutter blades.

Claim 51

An electromagnetically operated diaphragm shutter including: (a) a plurality of shutter blades; (b) a rotor drivingly connected to said shutter blades and operative upon rotation thereof to actuate said shutter blades to block and unblock a photo-taking light path; (c) electrically conductive members fixedly mounted on said rotor; (d) a magnetic member oriented relative to said rotor to form a magnetic field having a predetermined direction relative to said electrically conductive members; (e) a cutout provided through the wall of said rotor to permit a light metering optical path to extend therethrough, said cutout being located at positions other than the position of said conductive members on said rotor; (f) a member provided with an aperture for an auxiliary stop, said member being fixedly attached to said shutter, and said aperture being arranged to overlap said cutout provided in said rotor; and (g) diaphragm means positioned in the light metering optical path, said diaphragm means being arranged to define an opening of a size correlated to the size of an opening defined by said shutter blades.

Claim 52

A shutter according to claim 46 wherein said rotor is provided with an additional cutout arranged to compensate for unevenness of weight distribution of said rotor by virtue of the provision of said cutout in said rotor.

Claim 53

A shutter according to claim 47 wherein said cutouts are arranged symmetrically in relation to the center of rotation of said rotor.

Claim 54

A shutter according to claim 46 wherein said diaphragm means is arranged to be displaced in accordance with displacement of said blades.

Claim 55

A shutter according to claim 46 wherein at least one of said blades also serves as said diaphragm means.

Claim 56

A shutter according to claim 46 wherein a part of said rotor is arranged to serve as said diaphragm means.

Claim 57

A shutter according to claim 47 further including a stationary part and a stopper fixedly mounted on said stationary part of said shutter and arranged upon abutment against the side of one of said cutouts in said rotor to define at least one terminal end of the path of movement of said rotor.

Claim 58

A shutter according to claim 47, said shutter being operatively associated with a camera including a flash device and lever means responsive to film sensitivity information and guide number information of said flash device, said shutter further including a camming surface formed in a portion of one of said cutouts and cooperative with said lever means for adjusting the position of said rotor in accordance with said film sensitivity information and said guide number information of said flash device.

Claim 59

A shutter according to claim 46 wherein said conductive members include a printed circuit coil pattern formed on said rotor.

Claim 60

A shutter according to claim 54 wherein said printed circuit coil pattern is formed on the upper and lower surfaces of said rotor with the same pattern.

Claim 61

A shutter according to claim 46 wherein said electrically conductive members are arranged around the center of rotation of said rotor closer thereto and away therefrom in a wave-like fashion relative to the center of rotation.