Watch with hand in form of circular film and provided with electrostatic shielding device
AssigneeCitizen Watch Co., Ltd.
InventorsYasuo Kamiyama, Masao Mafune
Life of this patent
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Abstract
A wrist watch with hour and minute hands in the form of rotatable circular films, having an electrostatic shielding device which grounds a glass of the watch through a back cover of the watch, to eliminate static electricity produced in the glass. Also, because of the use of thin rotatable circular films for the minute and hour hands, the thickness of the watch can be considerably reduced.
Claims22
A watch with hour and minute hands, at least one of which is in the shape of a rotatable circular film, comprising a case, a movement which includes a drive which rotates the hour and minute hands, a train wheel which transmits the rotation of the drive to the hour and minute hands, a minute pinion which is operatively connected to the train wheel to rotate the minute hand, an hour wheel which is operatively connected to the minute pinion to rotate the hour hand, and a glass which is attached to the case to cover the movement on one side of the case, and a back cover which is attached to the case to cover the movement on the opposite side of the case and which is made of an electrically conductive material, wherein the improvement comprises an electrostatic shielding means for conducting static electricity which can be produced in the glass to the back cover of the watch case.
Dependencies are inferred from the claim text.