Abstract: A small-size motor of a type comprising brushes and a commutator slidably engaged with the brushes, characterized in that a motor case is filled with an atmosphere containing vapor of at least one organic compound selected from the group consisting of paraffins, mono- or poly-hydric alcohols, ethers, cyclic ethers, esters, ketones, ether alcohols, ester alcohols, aminoalcohols, carboxylic acids, amides, primary, secondary and tertiary amines, imidazoles, imidazolines and monocyclic oxyterpenes, which is stably operated and has a prolonged duration of life.

Abstract: A turntable device includes a disc base on the circumference thereof, and the disc base has a hardness more than a given level. The surface of the disc base is roughened at a given level in order to prevent the disc from slipping and adhesion to the disc base. The disc base can compensate surface wobble caused by the disc base. A manufacturing method of the turntable device includes the steps of: a) dripping liquid resin mixed with fine particles on the circumference of the turntable; and b) hardening the resin to form the disc base. The turntable device is good for e.g. CD players, optical disc driving apparatuses.

Abstract: In order to prevent clouding of a hard disc and a polygon mirror, a tin-free electrodepositing coating composition is used as an insulating coated film of a motor for driving the hard disc and polygon mirror.

Abstract: The present invention relates to a film forming method, in which a specified electrodeposition paint composed of at least an emulsion, a gel fine particle dispersion, and a pigment paste is applied by an electrodeposition coating method to an electronic part metal surface having a burr, followed by drying and baking to form an insulating film having an average thickness of 20 to 100 .mu.m.

Abstract: A miniature electric motor having a stator composed of a strip of rubber magnet having a varying width. The stator strip has; polarized regions of wide width, non-polarized regions of narrow width, and regions which bridge said polarized regions having a continuously varying width. The periphery of the polarized and non-polarized regions of the stator strip contains indents and protrusions to improve the cogging characteristics of the motor.

Abstract: A lining material superior in abrasion-proof, considerably reducing the sliding sounds to be caused at high speeds, and an ultrasonic wave driven motor using the lining material (9) for the inverted face of a rotor (2).The lining material is composed of total aromatic polyamide pulp granule of a meta type and/or total aromatic polyamide fiber of a meta type as main comonents, being 3 through 40% in the percentage of voids. As the lining material (9) is used as the inverted face of the rotor portion (2) which comes into contact against the vibration amplifying portion (5) of the stator portion (1), so that the noises during the driving operation may be reduced, and also, the service life of the inverted face may be extended.