US5229670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear motor device having vibration reduction unit
Assignee: Sharp Corp
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Filing: 1991-11-27
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Granted: 1993-07-20
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Expires: 2011-11-27
Abstract
Abstract An improved linear motor device is disclosed having a vibration reduction unit. The linear motor device can be applied to a copying machine. As a magnetic field forming device receives reaction force and is moved, in the opposite direction to the movement of movable members, vibration is not transmitted to a base frame. The magnetic field forming device is carried to a most suitable position for absorbing the vibration by a driving device employing a pulse motor. A velocity reduction ratio in a velocity reduction mechanism of the driving device is set to be different from a velocity reduction ratio under an ideal condition in which frictional force is neglected. As a result, the magnet field forming device can be driven by a smaller pulse motor.
Inventors
- 👤 Toshiaki Kagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:43
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02; H02K41/03; H02K41/031; B; B60; B60L; B60L13/00; B60L13/03; F; F16; F16F; F16F15/00; F16F15/02; F16F15/03; G; G03; G03G; G03G15/00; G03G15/04; B60L2200/00; B60L2200/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
152 words
A linear motor device, comprising: a linearly movable member moved linearly; armature winding means formed on said linearly movable member; vibration reduction means which is moved in the opposite direction to the movement of said linearly movable member, for reducing vibration caused by the movement of said linearly movable member; magnetic field means formed on said vibration reduction means and coupled to said armature winding means through an electromagnetic field, the vibration caused by the movement of said linearly movable member being transmitted to said vibration reduction means through said armature winding means and the magnetic field means; driving means for driving said vibration reduction means and the magnetic field means in the opposite direction to the movement of said linearly movable member under an ideal condition in which frictional force is neglected; and electromagnetic coupling reduction means for reducing electromagnetic coupling between said armature winding means and the magnetic field means.
Claim 2
Dependent Claim
152 words
A linear motor device, comprising: a linearly movable member moved linearly; armature winding means formed on said linearly movable member; vibration reduction means which is moved in the opposite direction to the movement of said linearly movable member, for reducing vibration caused by the movement of said linearly movable member; magnetic field means formed on said vibration reduction means and coupled to said armature winding means through an electromagnetic field, the vibration caused by the movement of said linearly movable member being transmitted to said vibration reduction means through said armature winding means and the magnetic field means; driving means for driving said vibration reduction means and the magnetic field means in the opposite direction to the movement of said linearly movable member under an ideal condition in which frictional force is neglected; and electromagnetic coupling reduction means for reducing electromagnetic coupling between said armature winding means and the magnetic field means.
Claim 3
Dependent Claim
52 words
The linear motor device according to claim 1, wherein said vibration reduction means includes reaction force absorbing means for absorbing reaction force from said movable member through the electromagnetic coupling between said armature winding means and the magnetic field means to reduce said vibration caused by the movement of said movable member.
Claim 4
Dependent Claim
84 words
The linear motor device according to claim 1, wherein said driving means includes: rotation power generating means for generating rotation power for moving said vibration reduction means and the magnetic field means; and reduction gear means for changing the velocity of the rotation power generated from said rotation power generating means with a predetermined velocity reduction ratio under said ideal condition, and wherein said vibration reduction means and the magnetic field means is driven by the rotation power output from said reduction gear means.
Claim 5
Dependent Claim
50 words
The linear motor device according to claim 3, wherein said driving means further includes: positional detection means for detecting a position of said linearly movable member; and rotation control means responsive to a detected position of said linearly movable member for controlling an output from said rotation power generating means.
Claim 6
Dependent Claim
52 words
The linear motor device according to claim 3, wherein said electromagnetic coupling reduction means includes velocity reduction ratio changing means for changing said predetermined velocity reduction ratio of said velocity reduction gear means by a predetermined value to reduce the electromagnetic coupling between said armature winding means and the magnetic field means.
Claim 7
Dependent Claim
44 words
The linear motor device according to claim 5, wherein said predetermined value is determined according to a relation between a permissible amount of vibration in said linear motor device and the maximum rotation power which can be supplied from said rotation power generating means.
Claim 8
Dependent Claim
65 words
The linear motor device according to claim 4, wherein said rotation power generating means includes a pulse motor for generating rotation power, said rotation control means includes a microprocessor responsive to a positional detection signal supplied from said positional detection means for generating a driving pulse for driving said pulse motor, and said pulse motor is driven by the driving pulse generated from said microprocessor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-19 | 1997-01-18 | 1997-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-19 | 2001-01-18 | 2001-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-19 | 2005-01-18 | 2005-07-20 | $7700.00 | Window Closed / Lapsed |