Motor for providing a vibrating action for a radio pager

• US 5,471,103 A
• Filed: 12/14/1992
• Issued: 11/28/1995
• Est. Priority Date: 12/17/1991
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Fujii, Masahiro
• Primary Examiner(s): Stephan, Steven L.
• Assistant Examiner(s): La Balle, C.
• Application Number:
  US07/990,597
• Time in Patent Office: 1,079 Days
• Field of Search: 310/43, 310/81, 310/268, 310/40 MM, 340/311.1, 340/407
• US Class Current: 310/81
• CPC Class Codes: G08B 6/00 Tactile signalling systems, e.g. personal calling systems
• CPC Class Codes: H02K 7/063 integrally combined with motor parts, e.g. motors with eccentric rotors

Abstract

A motor incorporated in a radio pager provides a vibrating action of the type used for alerting the user that he had received a call. A stator is affixed to the bottom of a casing. A rotor is in the form of a disk mounted on and affixed to a rotary a shaft and provided with coils therein. A weight having a sectorial shape is mounted on the top of the rotor in one embodiment and at the center of the coils in another embodiment.

Claims

1. A rotor assembly of a motor for providing a vibrating action, comprising:

a flat cylindrical rotor having coils disposed around the entire periphery thereof and being fixed to and mounted on a shaft which turn as a unit inside of a casing; and

at least an eccentric weight embedded entirely within said coils and said said rotor.

2. A rotor assembly as claimed in claim 1, wherein said weight is mounted in only a part of a surface of said rotor with respect to a circumferential direction thus causing an eccentric rotation.

3. A rotor assembly as claimed in claim 2, wherein said weight comprises a thin sectorial plate.

4. A rotor assembly as claimed in claim 1, wherein said weight is buried in only a part of said rotor with respect to a circumferential direction.

5. A rotor assembly as claimed in claim 4, wherein said weight comprises a thin sectorial plate.

6. A motor for providing a vibrating action incorporated in a radio pager, comprising:

a casing;

a stator affixed inside of said casing and comprising a permanent magnet having a plurality of poles;

a rotor mounted on and affixed to a shaft rotatably mounted inside of said casing, said rotor facing said stator, said rotor being provided with a plurality of coils which are uniformly arranged around a circumference of said rotor; and

a weight eccentrically mounted within an arcuate part of said rotor, thereby giving an eccentric rotation having a vibrating action.

7. A motor as claimed in claim 6, wherein said rotor has a cylindrical flat configuration, each of said coils have a hollow center, said weight being mounted in said hollow centers of said coils on only a part of a surface of said rotor with respect to a circumferential direction whereby said rotor rotates with an unbalanced eccentricity.

8. A motor as claimed in claim 7, wherein said weight comprises a thin sectorial plate.

9. A motor for providing a vibrating action incorporated in a radio pager, said motor comprising:

a casing;

a stator affixed inside of said casing and comprising a permanent magnet having a plurality of poles;

a rotor rotatably mounted on a shaft inside of said casing while facing said stator, said rotor being provided with a plurality of coils uniformly distributed around a circumference of said rotor; and

a weight buried within a sector part of said rotor to cause an eccentric action upon a rotation of said rotor.

10. A motor as claimed in claim 9, wherein said rotor has a cylindrical flat configuration.

11. A motor as claimed in claim 10 wherein said weight comprises a thin sectorial plate.