Movement of electronic watch of analog display type
AssigneeCasio Computer Co., Ltd.
InventorsMasayoshi Tanazawa, Masaru Shoji, Wataru Yamada
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Abstract
A movement of an electronic watch of analog display type is disclosed, which comprises a base plate made of a synthetic resin, a bearing plate made of a synthetic resin, and facing and spaced apart at a predetermined distance by a spacer from the baseplate and a step motor mounted on the baseplate, and including a rotor, a stator, and a coil. The rotation of the rotor of the motor is transmitted to hands, e.g., minute hand, through a gear train consisting of a plurality of gears, including those journaled between the baseplate and bearing plate. The gear train is made of a synthetic resin.
Claims14
A movement of an electronic watch of analog display type comprising:
- a baseplate made of a synthetic resin;
- a step motor mounted on said baseplate and including a rotor, a stator and a coil;
- a bearing plate made of a synthetic resin and facing and spaced apart at a predetermined distance from said synthetic resin baseplate;
- and
- a gear train consisting of a plurality of gears including gears journaled between said baseplate and bearing plate to transmit the rotation of said rotor of said motor to hands;
- said gears of said gear train being made of synthetic resin, the teeth of said gears being formed in an arc, and the radius of a top of the teeth of each of said gears is at least 0.4 times that of a module M defined by the relationship M=diameter of pitch line/divided by number of teeth.
Dependencies are inferred from the claim text.