Abstract: A polygon mirror assembly includes a polygon mirror and a supporting stand for supporting the polygon mirror. The supporting stand and the polygon mirror are combined in a pressure joining manner. The polygon mirror supporting structure can be provided so that the fastening of the polygon mirror is easily carried out, no unbalance of the center of rotation occurs and any eccentricity can be made extremely small.

Abstract: A painting method for painting a plurality of regions with a plurality of colors by selecting and assigning respective colors corresponding to respective regions. The selection and assignment of colors is performed in a lump. Painting the plurality of regions with selected colors is also performed in a lump.

Abstract: A polygon mirror assembly includes a polygon mirror and a supporting stand for supporting the polygon mirror. The supporting stand and the polygon mirror are combined in a pressure combination manner. The polygon mirror supporting structure can be provided so that the fastening of the polygon mirror is easily carried out, no unbalance of the center of rotation occurs and any eccentricity can be made extremely small.

Abstract: In a case of a document preparation using a reduced picture, since a position indicated by a pointing device is displayed always on an enlarged display window, the scrolling operation of the window for carrying out an enlarged display is reduced. When a part of a document displayed reduced on a "window 1" is indicated by a pointing device, at an indicated position a cursor of the "window 1" is made to move automatically. A cursor of a "window 2" is made to move by working together of the movement of the cursor of the "window 1". At that time, in a case in which the cursor position is not displayed on the "window 2", the cursor display position in the "window" is scrolled automatically. Since the cursor display position in the "window" is scrolled automatically, it is unnecessary to perform the scrolling operation of the "window 2". In a case of a document preparation using a reduced picture, the scrolling operation of the "window 2" for carrying out an enlarged display is reduced.

Abstract: A rotor of a permanent magnet type synchronous motor facing a stator having a number of slots comprises a rotor core fixed to a motor shaft and an even number of permanent magnets in a circumferential direction of the rotor core. Projecting portions are formed in the shape of a protruding portion of the rotor core over each permanent magnet. The width (A) of each projecting portion is different from the pitch (B) of the slots of the stator. A position detector for detecting the permanent magnet position of the rotor comprises detectors of the normal rotation and other detectors of the reverse rotation. These detectors are arranged having predetermined phase differences (.alpha., .beta.) to a center line. A pattern generating circuit is provided for switching the conducting position to the stator winding corresponding to the phase differences.

Abstract: A document processing printing apparatus such as a word processor has a main body constituted by a box-like frame. The frame includes a top surface serving as a flat paper supply guide surface. A print output unit included in the frame has at least one pair of rollers for transferring a recording paper along and on the paper supply guide surface and includes a flat platen, and a printing head.