Aperture driving apparatus and projection type image display...

Details Aperture driving apparatus and projection type image display... Aperture driving apparatus and projection type image display...

2011-01-11

2011-01-11

Duda, Rina I (Department: 2837)

Electricity: motive power systems

Positional servo systems

C318S798000

Reexamination Certificate

active

07868575

ABSTRACT:
An aperture driving apparatus includes a swing unit and a stationary unit. The swing unit includes an aperture plate that partially blocks a light, a coil that constitute a voice coil motor for obtaining a driving force for driving the aperture driving plate, and a swing arm that supports the aperture plate and the coil and has a bearing portion between the aperture plate and the coil. The stationary unit includes a swing shaft that engages the bearing portion and swingably supports the swing arm about a swing axis, and a magnet and a yoke that constitute the voice coil motor together with the coil. A control unit of the aperture driving apparatus controls the swing angle of the swing arm using a closed-loop control technique. In the direction of the swing axis, the position of a center of gravity of the swing unit is substantially aligned with a position at which the driving force is applied to the coil.

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