Patent ID: 7109620

Claim:
A motor used for driving a rotary color wheel having color filters pasted onto a circular disk to project and display a color picture image, the motor comprising a stationary part and a rotational part; wherein, the rotational part comprises: a hub, a magnet for driving, and a shaft of which an upper end is fixed to the hub; the stationary part comprises: a cylindrical sleeve made of a porous material having a predetermined aperture ratio that is impregnated with oil, a sleeve holding part like a cup having a lower bottom, the sleeve being held at an inner peripheral surface of the sleeve holding part, and the shaft being inserted into an inner peripheral surface of the sleeve, wherein an oil film is formed between the sleeve and the shaft supporting the rotational part; and a stator fixed to an outer peripheral surface of the sleeve holding part opposed to the magnet; and the sleeve holding part comprises: an annular concave portion that is trenched outward in the radial direction formed at an inner peripheral surface of the sleeve holding part having an annular radially outward bottom with a first diameter; an oil impregnating member that is impregnated with the oil, held in the annular concave portion and abutting on an outer peripheral surface of the sleeve, and a first upper inner peripheral part of the sleeve holding part that has a second diameter smaller than the first diameter and that is located above the annular concave portion, the first upper inner peripheral part being opposed to an outer peripheral surface of the sleeve via a first minute gap, wherein a gap width of the first minute gap has enough dimension for an adhering oil to be absorbed by the sleeve depending on the aperture ratio of the sleeve when the adhering oil adheres to the first minute gap.