Abstract: A holder and optical element device includes a holder having a substantially cylindrical interior shape and an optical element fitted in the holder along an inner surface of the holder. The holder may have a step on the inner surface thereof. This step has a surface that is inclined downward and inward from the interior surface of the holder. The optical element may have a convex optical surface section on a surface thereof and a flat surface section around the optical surface section, the flat surface section being disposed on the downward-inclined surface. The optical element is disposed on the inner surface of the holder in such a manner that the step is in contact with the peripheral surface of the optical element.

Abstract: A holder and optical element device includes a holder having a substantially cylindrical interior shape and an optical element fitted in the holder along an inner surface of the holder. The holder may have a step on the inner surface thereof. This step has a surface that is inclined downward and inward from the interior surface of the holder. The optical element may have a convex optical surface section on a surface thereof and a flat surface section around the optical surface section, the flat surface section being disposed on the downward-inclined surface. The optical element is disposed on the inner surface of the holder in such a manner that the step is in contact with the peripheral surface, of the optical element.

Abstract: A holder and optical element device includes a holder having a substantially cylindrical interior shape and an optical element fitted in the holder along an inner surface of the holder. The holder may have a step on the inner surface thereof. This step has a surface that is inclined downward and inward from the interior surface of the holder. The optical element may have a convex optical surface section on a surface thereof and a flat surface section around the optical surface section, the flat surface section being disposed on the downward-inclined surface. The optical element is disposed on the inner surface of the holder in such a manner that the step is in contact with the peripheral surface of the optical element.

Abstract: A brushless motor is disclosed having a plurality of stator coils disposed circumferentially around a rotatable shaft and a rotor magnet supported to a yoke fixed to the rotatable shaft and opposed to the stator coils. A radial bearing, for radially supporting the shaft, is supported at the center of a coil supporting member supporting the plurality of stator coils. The coil supporting member is formed integral with the radial bearing and is fixed to a casing having a thrust bearing at its center for axially supporting the shaft. Thus, the relative positional accuracy between the stator coil, thrust bearing, and radial bearing can be made high resulting in a stable rotating speed.