Brushless motor having turntable

Details Brushless motor having turntable Brushless motor having turntable

2001-07-09

2003-01-28

Nguyen, Tran (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S06700R, C310S0400MM, C360S093000, C360S099030, C360S099050, C360S099120

Reexamination Certificate

active

06512315

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a brushless motor having a less turntable for driving media such as CD-ROMs or DVD-ROMs.
2. Description of the Related Art
Referring to
FIG. 2
, a conventional brushless motor for driving media such as CDs includes a rotor R where a turntable T, which is cut from brass, for accommodating a medium is integrally formed at one side of a rotor case K and a magnet M is formed at the other side of the case K, a shaft J for supporting the rotor R, a housing H for rotatably supporting the shaft J, and a stator ST arranged at one side of the housing H for driving the rotor R.
However, since the turntable T for mounting a medium is formed by a brass cutting process, the cost of materials increases and installation thereof is inconvenient. In particular, since verticality of the shaft J is strictly required to drive a medium such as a CD-ROM, the turntable T for mounting the medium is installed on the shaft J and then the turntable T is cut at right angles with respect to the shaft J. However, although brass is relatively easy to cut, while the shaft J is cut, strength is necessarily brought to the shaft J because brass is metal. Accordingly, when strength applied to firmly hold the turntable T is weak, the shaft J is damaged.
Also, to reduce the cost for production, as shown in
FIG. 3
, a turntable JT formed of resin is used. However, when the turntable JT is used, accurate mounting is required and a thin leaf spring B pressing the inner circumferential portion of a medium is additionally needed to secure support strength with respect to the media.
SUMMARY OF THE INVENTION
To solve the above problems, it is an objective of the present invention to provide a brushless motor having a turntable so that a high-priced turntable formed by cutting brass is not needed and the cost for production can be reduced.
It is another objective of the present invention to provide a brushless motor having a turntable which does not use an additional thin leaf spring to press the inner diameter portion of a medium.
It is yet another objective of the present invention to provide a brushless motor for automatically compensating unbalance of a rotation system with a simple structure.
Accordingly, to achieve the above objectives, there is provided a brushless motor having a turntable including a rotor in which a turntable is integrally formed on the outer side of a rotor case and a magnet is arranged on the inner side thereof, a shaft for supporting the rotor, a stator base for supporting the shaft, and a stator formed on a portion of the stator base for driving the rotor, in which the turntable which has a media mounting portion at least partly formed of resin, includes a media installation guide formed of the same resin to support a medium, and at least one media inner diameter chucking spring member integrally formed of resin to have a diameter slightly greater than the media installation guide and the inner diameter of the media.
It is preferred in the present invention that a ball housing containing mobile balls for compensating unbalance is provided at the turntable opposite to a media mounting surface of the media mounting portion.
It is preferred in the present invention that the turntable is installed at a shaft protruding above the rotor case.
It is preferred in the present invention that the media inner diameter chucking spring member is arranged at a space and a free end thereof protrudes above the media mounting portion.
It is preferred in the present invention that a media slip preventing means is provided on a media mounting surface at least at the outer circumference of the turntable.
It is preferred in the present invention that a media mounting surface of the resin media mounting portion which contacts the medium is cut-processed at right angles with respect to the shaft.


REFERENCES:
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patent: 6281608 (2001-08-01), Matsushima
patent: 2000-90527 (2000-03-01), None

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