The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 24, 1988
Filed:
Apr. 30, 1987
Yukiharu Sanbe, Tokyo, JP;
Taito Corporation, Tokyo, JP;
Abstract
In a method of displaying a picture according to the present invention, at least one starting point is determined on a picture screen; a picture is produced on a spiral raster which diverges from or converges toward each of the starting points; a shape, phase, linear density, and scanning speed of each spiral raster are controlled; thereby the patterns displayed on the screen are moved, rotated, enlarged, reduced, or modified. The central position of this spiral raster is given by setting deflection control signals in the X and Y directions of an electron beam into fixed values. The spiral raster is given by adding sine waves whose amplitudes gradually increase or decrease to the above deflection control signals. When the frequencies of the deflection control signals are constant, the scanning is performed at a constant angular velocity. On the other hand, when the frequencies are changed in proportion to the amplitudes, the scanning can be done at a constant speed.