DRIVING DEVICE AND LIGHT AMOUNT ADJUSTING DEVICE
First Claim
1. A driving device comprising:
- a magnet formed into a hollow circular disk shape, at least one disk surface of said magnet being magnetized to have alternately different poles in a circumferential direction thereof;
a rotor yoke disposed for rotation relative to said magnet, said rotor yoke having magnetic pole parts thereof extending radially of said magnet and facing the magnetized disk surface of said magnet;
a stator yoke disposed on a side remote from said rotor yoke with respect to said magnet, with said magnet interposed between said stator yoke and said rotor yoke, said stator yoke being fixed with said magnet; and
a coil, fixed to said stator yoke, for magnetizing the magnetic pole parts of said rotor yoke.
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Accused Products
Abstract
A light amount adjusting device mounted with a driving device which can have a reduced size in the direction of thickness. In this controller, a magnet is formed into a hollow circular disk shape and has at least one disk surface magnetized to have alternately different poles in the circumferential direction thereof. A rotor yoke is supported by a bobbin for rotation relative to the magnet, and has magnetic pole parts extending radially of the magnet and facing the magnetized disk surface of the magnet. A stator yoke is disposed on the side remote from the rotor yoke with respect to the magnet and fixed with the magnet. A coil is fixed to the stator yoke and magnetizes the magnetic pole parts of the rotor yoke. Shutter blades are disposed radially inside the magnet.
15 Citations
9 Claims
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1. A driving device comprising:
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a magnet formed into a hollow circular disk shape, at least one disk surface of said magnet being magnetized to have alternately different poles in a circumferential direction thereof;
a rotor yoke disposed for rotation relative to said magnet, said rotor yoke having magnetic pole parts thereof extending radially of said magnet and facing the magnetized disk surface of said magnet;
a stator yoke disposed on a side remote from said rotor yoke with respect to said magnet, with said magnet interposed between said stator yoke and said rotor yoke, said stator yoke being fixed with said magnet; and
a coil, fixed to said stator yoke, for magnetizing the magnetic pole parts of said rotor yoke. - View Dependent Claims (2, 3, 4, 5)
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6. A light amount adjusting device, comprising:
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a driving device;
a base plate formed with an opening; and
a light amount control member, wherein said driving device comprises;
a magnet formed into a hollow circular disk shape, at least one disk surface of said magnet being magnetized to have alternately different poles in a circumferential direction thereof;
a rotor yoke disposed for rotation relative to said magnet, said rotor yoke having magnetic pole parts thereof extending radially of said magnet and facing the magnetized disk surface of said magnet;
a stator yoke disposed on a side remote from said rotor yoke with respect to said magnet, with said magnet interposed between said stator yoke and said rotor yoke, said stator yoke being fixed with said magnet; and
a coil, fixed to said stator yoke, for magnetizing the magnetic pole parts of said rotor yoke, and wherein said light amount control member is operable with rotation of said rotor yoke of said driving device to adjust an open area amount of said opening of said base plate. - View Dependent Claims (7, 8, 9)
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Specification