Electronic watch

Details Electronic watch Electronic watch

1998-10-21

2000-09-19

Roskoski, Bernard

Horology: time measuring systems or devices

Mechanical time base

Mainspring

368149, 368150, G04C 2100

Patent

active

061201774

ABSTRACT:
In an electronic watch including a so-called automatic winding dynamo, structures of parts themselves and layout of the parts are improved to achieve a reduction in thickness of the electronic watch. Bearing portions for a rotational shaft (211) of a dynamo rotor (21) are made up of hole jewels (212, 214) and ring-shaped caps (213, 215). The cap (215) covers, from the outer side, one end surface (216) of the hole jewel (214) which locates on the side facing a dynamo rotor (21), and defines a lubricant holding annular slot (G3) between the cap and an outer circumferential surface of the rotational shaft (211). Accordingly, even with the dynamo rotor (21) rotating at a high speed, a lubricant is prevented from scattering to the surroundings from the annular slot (G3). Spacings between adjacent parts can be narrowed and the thickness of the electronic watch can be reduced.

REFERENCES:
patent: 2807133 (1957-09-01), Maire
patent: 2981055 (1961-04-01), Froidevaux et al.
patent: 3733806 (1973-05-01), Murrle
patent: 4910720 (1990-03-01), Ray et al.
patent: 5119348 (1992-06-01), Mathys

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