Rotary optical filter apparatus integrated with cooling fan and illumination optical system
AssigneeFuji Photo Optical Co., Ltd.
InventorMasayuki Inamoto
Life of this patent
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Abstract
A rotary optical filter apparatus containing an optical filter is integrated with a sirocco type cooling fan having a plurality of fan blades. The cooling fan is supported by a rotary holder of the optical filter apparatus so as to be integrally rotatable with the optical filter. The cooling fan inhales an air from its center part and discharges thus inhaled air from its outer peripheral part due to an action of the fan blades upon rotating, so as to make an airflow along the filter face and cool the optical filter.
Claims7
A rotary optical filter apparatus integrated with a cooling fan, said rotary optical filter comprising a rotary holder axially supported with respect to a predetermined rotary axis;
- and an optical filter having a filter face formed so as to exhibit a predetermined optical characteristic, said optical filter being rotated together with said rotary holder while being held by said rotary holder such that said filter face is substantially orthogonal to said rotary axis;
- wherein said cooling fan is a sirocco type cooling fan comprising a plurality of fan blades, each having a wing-shaped cross section extending radially of said rotary axis, arranged circumferentially of said rotary axis at respective positions outwardly separated from said rotary axis, said cooling fan being supported by said rotary holder so as to be integrally rotatable with said optical filter, said cooling fan inhaling an air from a center part and discharging thus inhaled air from an outer peripheral part due to an action of said fan blades upon rotating, so as to make an airflow along said filter face and cool said optical filter.
Dependencies are inferred from the claim text.