アナログ多機能クォーツの開発I : Cal.5T・7T (1989年秋季講演会) Development of Multi-Function Analogue Quartz Watch I
Cal. 5T and 7T series are the multi-function analogue quartz timepieces whose movement can be widely applied to chronograph, alarm, timer, worldtime display, and so on. This can be realized by the development of the CPU-IC, the birotational stepping motor, and the compact and widely useful mechanism. Not only the movement size, but also the operational easiness, legibility, and the repairability are much improved as compared with the conventional multi-function watches. This paper describes the system constructions and the mechanism of the Cal. 5T and 7T series.
日本時計学会誌 132(0), 13-32, 1990