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| Double-balanced mixer |
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Exciter for generating vibration in a pager
| Details |
Inventors: You, Dong-Ok; You, Ok-Jung;
Assignee:
Primary Examiner: Stephan; Steven L.
Assistant Examiner: Nguyen; Tran N.
Attorney, Agent or Firm: Lowe, Price, LeBlanc & Becker
Disclosed is an exciter for generating physical vibration in response to the applied electric signal. In this device, a driving coil is attached to the periphery of an inner guide of a lower housing, and a rotor of permanent magnet is provided in the rotor-receiving space of the inner guide, both ends of the rotor being rotatably supported to the inner guide. An upper housing is engaged with the lower housing in such a manner that the upper housing surrounds the driving coil. In this device, the rotation shaft of the rotor is on a shifted state with respect to a center of a gravity of the rotor, by which means the exciter generates vibration through the upper and lower housings when the rotor rotates by the electromagnetic force of the driving coil. |
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DETAILED DESCRIPTION It is a general object of the present invention to provide an exciter which substantially eliminates those disadvantages inherent in both the construction, use and availability of the prior known apparatus.
Another object of the present invention is to provide an exciter which is of substantially simple and inexpensive and which can create sufficient vibration force in spite of small size.
Still another important object of the present invention is to provide an exciter which can be assembled easily in the set by automatic mounting system, thus permitting a low cost supply cost.
To achieve these objects, there requires a completely new apparatus which itself can creats unbalance of the center of gravity independently of a motor-driven rotation movement in virtue of such a structure.
To meet this requirement, after repeated researches has been pursued, this exciter can be produced by combining a driving coil attached to the housing to produce an alternating magnetic field with a rotor using a permanent magnet located rotaatably in the driving coil so as to rotate in response to electromagnetic force of the driving coil and to create vibration by its unbalanced weight structure or shocks.
In view of this, it is provided an exciter for generating physical vibration in response to an incoming call, comprising: a lower housing having a base and a cylindrical inner guide which is vertically disposed on the base, the inner guide having an upper opening to form a predetermined space at a central portion; a stator, attached to a periphery of the inner guide of the lower housing, for generating an electromagnetic force which is converted in an upper or lower direction responsive to an AC signal from outside; a rotor having a rotation part disposed in the inner space of the inner guide, both side ends of the rotation part being rotatably supported to both side walls of the inner guide, for rotating responsive to the electromagnetic force; and an upper housing having a pair of inwardly projecting portions engaged with the inner guide of the lower housing to rotatably support both side ends of the rotator, and a outer cylindrical portion engaged with the lower housing to surround the stator, whereby the exciter generates vibration at the upper and lower housings responsive to the rotation movement of the rotator
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Ring Tones 
