Optical sensing apparatus, filter apparatus, and projector with anti-dust structure

A filter apparatus with anti-dust structure, the filter apparatus comprising:

• a base;
• a color wheel module, disposed on the base, the color wheel module comprising a rotation device having a rotation surface rotating along a rotation direction;
• an optical sensor, disposed on the base, the optical sensor having a sensing surface opposite to the rotation device, a first distance being formed between the sensing surface and the rotation surface;
• and
• a stop block, disposed at a side of the optical sensor, the stop block and the optical sensor being disposed on the base in accordance with an order of the rotation direction, the stop block having a stagnation surface, a second distance being formed between the stagnation surface and the rotation surface, wherein the second distance is smaller than or equal to the first distance.

A projector with anti-dust structure, the projector comprising:

• a housing, an accommodating space being formed inside the housing;
• a base, disposed in the accommodating space;
• a color wheel module, disposed on the base, the color wheel module comprising a rotation device having a rotation surface rotating along a rotation direction;
• an optical sensor, disposed on the base, the optical sensor having a sensing surface opposite to the rotation device, a first distance being formed between the sensing surface and the rotation surface;
• and
• a stop block, disposed at a side of the optical sensor, the stop block and the optical sensor being disposed on the base in accordance with an order of the rotation direction, the stop block having a stagnation surface, a second distance being formed between the stagnation surface and the rotation surface, wherein the second distance is smaller than or equal to the first distance.