Timepiece mainspring, timepiece drive device, timepiece movement, timepiece, and manufacturing method of timepiece mainspring

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United States of America Patent

PATENT NO 10317842
APP PUB NO 20170308037A1
SERIAL NO

15486766

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Abstract

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A timepiece mainspring is accommodated inside a barrel, an inner end thereof is fixed to a barrel arbor included in the barrel, and an outer end thereof engages with an inner wall of the barrel. The timepiece mainspring includes a helical portion wound in a Bernoulli curve shape from the inner end in a free state having no applied load.

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Patent Owner(s)

Patent OwnerAddress
SEIKO EPSON CORPORATIONTOKYO

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kobayashi, Shogo Shiojiri, JP 63 176
Nakata, Keisuke Matsumoto, JP 30 56
Takeuchi, Masao Azumino, JP 22 363

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