アナログクォーツクロノグラフ

抄録

An anologue quartz timepiece, Cal. 7A28, the first Analogue Quartz Chronograph in the world, is reported here, which is operated by four independent driving motors. Cal. 7A28 is an Analogue Quartz Chronograph with the improved levels in time measuring efficiency, time accuracy, reliability, and maintenance, and also is an analogue quartz timepiece including complicated and multiple functions. In this paper, the operating performance, structure of the movement, and the electronic circuit are discussed in connection with the fine mechanism and the microelctronics. This paper may serve to promote analogue quartz timepieces equipped with multiple functions.