JPH0622519A - Hollow motor - Google Patents

Abstract

PURPOSE:To provide an excellent motor which has property required for driving and can materialize a small-sized driver by uniting a drive motor with the driver without arranging it outside the driver, in the driver for a camera, a robot, or the like. CONSTITUTION:A flexible printed board, where a stator coil 13 is constituted on the same plane, is fixed to a cylindrical outer frame 1, and a rotor magnet 5 being arranged to oppose the stator coil 13 is fixed to a cylindrical inner frame 4, and a bearing 6 is arranged at an outer frame 1 so that it may bear the inner frame 4 rotatably. By constituting the inside-diameter part of the inner frame 4 to be hollow; the parts required for driving can be arranged inside the inside-diameter hollow part, thus an excellent motor, which can materialize the downsizing of a driver, can be gotten.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow cylindrical motor for driving a lens assembly such as a camera or a video camera,
Alternatively, the present invention relates to a motor capable of arranging components necessary for driving in an inner diameter portion of an inner frame such as a driving motor of a robot or the like that slides in the axial direction.

[0002]

2. Description of the Related Art For example, a motor used to move a position of a lens arranged in a lens barrel of a camera is a gear fixed to a shaft and a gear provided on an outer diameter portion of a lens assembly to which the lens is fixed. To move the lens to the required position. A conventional example in which this motor is applied to drive a lens of a camera is shown in FIG.

In FIG. 6, 21 is a lens assembly for fixing the lens, 22 is a gear provided on the outer diameter portion of the lens assembly, 23 is a motor for driving the lens assembly, 24 is a gear fixed to the shaft of the motor, 2
Reference numeral 5 is a housing that supports the lens assembly and the motor, 26 is a cam pin fixed to the lens assembly, and 27 is an inner housing that has a cam groove into which the cam pin 26 is inserted and has a gear 22 fixed therein.

The operation of the lens barrel constructed as described above will be described below. First, when the motor 23 is energized, the gear 24 fixed to the shaft of the motor 23 rotates, and the lens assembly 2 meshed with the gear 24.
1 moves the gear 22 fixed to the outer diameter portion and the inner housing 27 fixed to the gear 22, moves the cam pin 26 inserted into the cam groove provided in the inner diameter portion of the inner housing 27, and the lens assembly 21 is required. Moving to a position.

[0005]

However, in the above-mentioned conventional structure, the space for disposing the motor hinders miniaturization.

The present invention solves the above-mentioned problems of the prior art. A motor which hinders miniaturization is formed by a hollow cylindrical motor having a hollow inner diameter portion of a rotor without a shaft. You can place the necessary parts,
It is intended to provide a motor that can be downsized.

[0007]

To achieve this object, a hollow motor according to the present invention has a stator portion fixed to a housing, and a rotor inner diameter portion rotatably supported by a bearing fixed to the stator inner diameter portion. The inner diameter of the rotor is hollow so that the necessary parts can be arranged.

[0008]

By configuring the inner diameter portion of the rotor to be hollow, necessary parts (lens assembly in the case of a lens barrel) can be arranged in the inner diameter portion of the rotor, and space saving and miniaturization can be realized.

[0009]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is an outer frame, 2 is a flexible printed circuit board, 3 is a stator coil, 4 is an inner frame, 5 is a rotor magnet, and 6 is a bearing.

The stator coil 3 is wired on the flexible printed board 2 and is fixed to the outer frame 1 together with the flexible printed board 2. The magnet 5 is fixed to the inner frame 4 and is arranged so as to face the stator coil 3. Outer diameter portions 6a and 6b of the bearing 6 are fixed to inner diameter portions of both end surfaces of the outer frame 1 which is a stator portion, and inner diameter portions 6c and 6d of bearing 6 are fixed to outer diameter portions of both end surface of the inner frame 4 which is a rotor portion. And rotatably supports the rotor.

The operation of the hollow motor constructed as above will be described. First, when the stator coil 3 is energized through the flexible printed circuit board 2, a magnetic field is generated by the current flowing through the stator coil 3, a rotational force is generated due to the relationship with the magnetic flux of the rotor magnet 5, and the bearing 6 allows the rotor to rotate freely. Since the rotor is supported, the rotor rotates concentrically with the stator. Since the inner diameter of the rotating rotor is hollow, necessary parts can be placed in the hollow part, and necessary parts can be placed in the inner diameter of the motor, saving space and reducing size. can do.

As described above, according to this embodiment, the shaft is eliminated and the inner diameter portion of the rotor is hollow,
Miniaturization can be achieved by arranging the necessary parts inside the motor.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, 1 is an outer frame, 4 is an inner frame, 5 is a rotor magnet, and 6 is a bearing. The above is the same as the configuration of FIG. The difference from the configuration of FIG. 1 is that the stator coil 12 is connected to the flexible printed circuit board 13.
The point is that it is formed on the same surface by plating or etching.

The operation of the hollow motor having the above structure will be described below. The operation in this case is exactly the same as the operation of the first embodiment, and since the stator coil 12 is formed on the same surface as the flexible printed circuit board 13, the thickness of the rotor and the stator in the radial direction is increased by the thickness of the stator coil. Further, the number of steps for wiring the stator coil to the flexible printed board and the number of steps for fixing the stator coil to the outer frame can be reduced.

As described above, according to this embodiment, the stator coil 12 is formed on the same surface as the flexible printed circuit board 13, so that the same performance as that of the first embodiment is maintained and the number of man-hours for assembling the motor is reduced. A small and thin hollow motor can be constructed.

(Embodiment 3) A third embodiment of the present invention will be described below with reference to the drawings.

In FIG. 3, 1 is an outer frame, 2 is a flexible printed circuit board, 3 is a stator coil, 4 is an inner frame, 5 is a rotor magnet, and 6 is a bearing. The above is the same as the configuration of FIG. The difference from the configuration of FIG. 1 is that a plurality of spiral grooves 7 are formed in the hollow cylindrical portion of the inner frame 4
That is the point.

The operation of the hollow motor constructed as described above will be described below. The operation in this case is exactly the same as the operation of the first embodiment, and by providing a plurality of spiral grooves 7 in the inner diameter hollow cylindrical portion of the inner frame 4, by engaging a cam or the like in the spiral grooves 7, the rotor It is possible to move the drive parts arranged in the inner diameter part of the.

As described above, according to this embodiment, since the plurality of spiral grooves 7 are formed in the inner hollow cylindrical portion of the inner frame 4, the driving parts arranged in the inner hollow cylindrical portion of the rotor can be moved. Therefore, it is possible to provide a hollow motor that can be miniaturized.

(Embodiment 4) A fourth embodiment of the present invention will be described below with reference to the drawings.

In FIG. 4, 1 is an outer frame, 2 is a flexible printed circuit board, 3 is a stator coil, 4 is an inner frame, 5 is a rotor magnet, and 6 is a bearing. The above is the same as the configuration of FIG. The difference from the configuration of FIG. 1 is that a screw 8 is cut in the hollow cylindrical portion of the inner frame 4 having an inner diameter.

The operation of the hollow motor constructed as described above will be described below. The operation in this case is exactly the same as the operation of the first embodiment, and the screw 8 is cut in the hollow cylindrical portion of the inner frame 4 so that the screw 8 is engaged with the inner diameter portion of the rotor so that The arranged drive parts can be moved.

As described above, according to this embodiment, by cutting the screw 8 on the hollow cylindrical portion of the inner frame 4,
It is possible to provide a hollow motor capable of moving a drive component arranged in a hollow cylindrical portion of the inner diameter of a rotor and realizing miniaturization.

(Embodiment 5) A fifth embodiment of the present invention will be described below with reference to the drawings.

In FIG. 5, 1 is an outer frame, 2 is a flexible printed circuit board, 3 is a stator coil, 4 is an inner frame, 5 is a rotor magnet, and 6 is a bearing. The above is the same as the configuration of FIG. The difference from the configuration of FIG. 1 is that a gear 9 is formed in the hollow cylindrical portion of the inner frame 4 of the inner diameter.

The operation of the hollow motor having the above structure will be described below. The operation in this case is exactly the same as the operation of the first embodiment. Since the gear 9 is formed in the inner hollow cylindrical portion of the inner frame 4, the gear 9 is meshed with the gear 9 so that the inner diameter of the rotor is not changed. The arranged drive parts can be moved.

As described above, according to this embodiment, since the gear 9 is formed in the hollow inner diameter portion of the inner frame 4, the driving parts arranged in the hollow inner cylindrical portion of the rotor can be moved, and the size can be reduced. It is possible to provide a hollow motor that can realize the above.

[0030]

As described above, according to the present invention, by forming the inner diameter portion of the rotor to be hollow, necessary parts can be arranged in the hollow portion and miniaturization can be realized. Further, by constructing the stator coil on the same surface of the flexible printed circuit board, the number of steps for assembling the motor can be reduced, and the motor can be further reduced in size and thickness. Further, by forming a plurality of spiral grooves, screws, gears, etc. in the hollow inner diameter portion of the inner frame, it is possible to move the driving parts arranged in the hollow inner diameter portion of the rotor, and hence it is possible to realize miniaturization. .

[Brief description of drawings]

FIG. 1 is a sectional view of a hollow motor according to a first embodiment of the present invention.

FIG. 2A is a cross-sectional view of a hollow motor according to a second embodiment of the present invention. FIG. 2B is a perspective view of a flexible printed circuit board in which stator coils according to a second embodiment of the present invention are formed on the same plane.

FIG. 3 is a sectional view of a hollow motor according to a third embodiment of the present invention.

FIG. 4 is a sectional view of a hollow motor according to a fourth embodiment of the present invention.

FIG. 5 is a sectional view of a hollow motor according to a fifth embodiment of the present invention.

FIG. 6 is a half sectional view of a lens barrel when a conventional motor is used.

[Explanation of symbols]

 1 Outer Frame 2,12 Stator Coil 3,13 Flexible Printed Circuit Board 4 Inner Frame 5 Rotor Magnet 6 Bearing 6a, 6b Outer Diameter 6c, 6d Bearing Inner Diameter 7 Helical Groove 8 Screw 9, 22, 24 Gear 21 Lens Assembly 23 Motor 25 Housing 26 Cam pin 27 Inner housing

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[Procedure amendment]

[Submission date] September 30, 1992

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Claims (5)

[Claims] 1. A rotor magnet in which N poles and S poles are alternately magnetized circumferentially, a cylindrical inner frame to which the rotor magnet is fixed, a bearing rotatably supporting the inner frame, and the rotor. A plurality of flat stator coils, one surface of which is opposed to the magnet with a gap therebetween, a flexible printed board on which the stator coils are wired, and a cylindrical shape in which the stator coil, the flexible printed board, and the bearing are fixed. With an outer frame,
A hollow motor, wherein the inner frame is formed of a hollow cylinder. 2. The hollow motor according to claim 1, wherein the stator coil is formed on the same surface as the flexible printed circuit board by a plating method or an etching method. 3. The hollow motor according to claim 1, wherein a plurality of spiral grooves are provided in the hollow cylindrical portion of the inner frame of the inner frame. 4. The hollow motor according to claim 1, wherein a screw is cut on the hollow cylindrical portion of the inner frame of the inner frame. 5. The hollow motor according to claim 1, wherein a gear is fixed to the inner diameter cylindrical portion of the inner frame, or a gear is directly formed on the inner diameter of the inner frame.