A color wheel is attached to a hub of a motor before the hub is built in the motor. In this process, portions of the hub which do not impact the rotation accuracy of the motor are held by appropriate clamping means and attaching means so that excessive stress and heat are not applied to bearings of the motor. Then, the hub with the color wheel attached thereto is assembled to the rest of components of the motor.

 
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< Screen having micro-lens array and projector

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> Data multiplexing device, program distribution system, program transmission system, pay broadcast system, program transmission method, conditional access system, and data reception device

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