Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2001-04-17
2003-05-06
Nguyen, Tran (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S049030, C310S099000, C310S114000
Reexamination Certificate
active
06559569
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a driving device composed of an ultra-small motor, and particularly to an aperture blade driving device using the same.
2. Related Backgroud Art
FIG. 18
shows one of small-sized cylindrical step motor in the prior art. A stator coil
105
is wound around a bobbin
101
concentrically. The bobbin
101
is fixed by being axially held and fixed by two stator yokes
106
and
106
. Each stator yoke
106
has stator teeth
106
a
and
106
b
that are alternately placed on the inner circumferential surface and in the circumferential direction of the bobbin
101
. The stator yoke
106
integrated with the stator teeth
106
a
or
106
b
is fixed to case
103
thereby comprising a stator
102
.
Of two cases
103
and
103
, one case
103
has a flange
115
and a bearing
108
that are fixed thereto whereas the other case
103
has another bearing
108
fixed thereto. A rotor
109
is composed of a rotor magnet
111
fixed to a rotor shaft
110
. A radial void is formed between the rotor magnet
111
and the stator teeth
106
a
of stator
102
. The rotor shaft
110
is rotatably supported between the two bearings
108
and
108
.
FIG. 20
shows a step motor that is one of those driven by a single coil and is frequently used in watches. Denoted by
201
is a rotor composed of a permanent magnet, and
202
and
203
denotes stators while
204
denotes a coil.
The conventional small-sized step motor shown in
FIG. 18
has a drawback that the external dimension of the motor is large because the case
103
, the bobbin
101
, the stator coil
105
and the stator yoke
106
are arranged concentrically about the outer periphery of the rotor. This step motor has another drawback of low output, for, as shown in
FIG. 19
, the flux of magnetic force generated upon energization of the stator coil
105
mainly passes between an end face
106
a
1
of the stator tooth
106
a
and an end face
106
b
1
of the stator tooth
106
b
and does not act on the rotor magnet
111
effectively.
The step motor shown in
FIG. 20
is also ineffective in making the flux of magnetic force that is generated upon energization of the coil act on the magnet because the flux of magnetic force concentrates on a small gap between the stator
202
and the stator
203
. The inventors of the present invention have proposed a motor to solve these problems in Japanese Patent Application Laid-Open No. 9-331666 (U.S. Pat. No. 5,831,356).
The motor proposed has a rotor formed into a cylinder and composed of a permanent magnet that is divided into equal parts along the circumferential direction and is magnetized so as to form different poles alternately. In the axial direction of the rotor, a first coil, the rotor and a second coil are arranged in this order. The first coil excites a first outer magnetic pole that faces the outer peripheral surface of the rotor as well as a first inner magnetic pole that faces the inner peripheral surface of the rotor. The second coil excites a second outer magnetic pole that faces the outer peripheral surface of the rotor as well as a second inner magnetic pole that faces the inner peripheral surface of the rotor. The rotation axis that is the rotor shaft is taken out the interior of the cylindrical permanent magnet.
The motor structured as above has a high output and a small motor external dimension, but there is room to improve it in facilitating joining of the rotor shaft to the permanent magnet. If a thin magnet is used in the structure above, the distance between the first outer magnetic pole and the first inner magnetic pole as well as the distance between the second outer magnetic pole and the second inner magnetic pole can be closed, resulting in a reduction in magnetic resistance in the magnetic circuit. This makes it possible to generate more flux of magnetic force with a small amount of current flowing through the first coil and the second coil.
However, the motor disclosed in Japanese Patent Application Laid-Open No. 9-331666 and other motors of that type are required to be long to a certain degree in the axial direction. For that reason, there has lately been a demand for a drive transmission device composed of a ultra-small motor whose axial length is very short. The drive transmission device composed of a ultra-small motor whose axial length is very short is particularly needed as a drive transmission device used in a lens barrel of a camera in order to drive an aperture blade, a shutter, a lens, etc.
SUMMARY OF THE INVENTION
A first object of the present invention is to provide a drive transmission device composed of an ultra-small motor that is easy to assemble and has high output.
A second object of the present invention is to provide a drive transmission device composed of an ultra-small motor whose axial length is very short.
A third object of the present invention is to provide an aperture blade driving device as an actuator for driving an aperture blade to open and close the blade which does not form an obstacle in arranging a lens with respect the direction parallel to the principal axis.
According to one aspect of the present invention, a motor device comprises:
a first motor unit including:
a first rotary magnet that is cylindrical and magnetized so as to have different magnetic poles in turn along the circumferential direction;
a first rotary gear having a plurality of teeth, the rotary gear rotating about the rotation axis of the first rotary magnet together with the first rotary magnet; and
a stator member having a plurality of outer magnetic poles that are arranged on the outer periphery of the first rotary magnet and a plurality of inner magnetic poles that are arranged on the inner periphery of the first rotary magnet and are opposed to the outer magnetic poles, the plural outer magnetic poles and the plural inner magnetic poles being excited by a first coil;
a second motor unit including:
a second rotary magnet that is cylindrical and magnetized so as to have different magnetic poles in turn along the circumferential direction;
a second rotary gear having a plurality of teeth, the rotary gear rotating about the rotation axis of the second rotary magnet together with the second rotary magnet; and
a stator member having a plurality of outer magnetic poles that are arranged on the outer periphery of the second rotary magnet and a plurality of inner magnetic poles that are arranged on the inner periphery of the second rotary magnet and are opposed to the outer magnetic poles, the plural outer magnetic poles and the plural inner magnetic poles being excited by a second coil; and
a driven member meshed with the first rotary gear and the second rotary gear,
wherein electric power having different phases are supplied to the first and second coils to rotate the first rotary gear and the second rotary gear, which then drive the driven member.
The number of teeth of the first rotary gear is equal to the number of magnetic poles of the first rotary magnet, and the number of teeth of the second rotary gear is equal to the number of magnetic poles of the second rotary magnet.
The number of magnetic poles of the first rotary magnet is equal to the number of magnetic poles of the second rotary magnet.
The first and second motor units are arranged side by side so that their rotation axes are in parallel with each other.
The number of the plural outer magnetic poles is half the number of the magnetic poles of the respective rotary magnets.
The device further comprises an aperture blade that is put in motion when the driven member is driven.
The first rotary gear is formed in the first rotary magnet and the second rotary gear is formed in the second rotary magnet.
According to another aspect of the present invention, a motor device comprises:
a first motor unit including:
a first rotary magnet that is cylindrical and magnetized so as to have different magnetic poles in turn along the circumferential direction, the first rotary magnet having a first gear portion that is formed therein and has a p
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