| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide components and sub-assemblies of watch with high strength and dimensional precision, and a watch therewith. <P>SOLUTION: Gears of numbers 102-106 of a watch 1 are manufactured by direct electrocasting based on photomask patterns of high dimensional precision. Accordingly, dimensional precision of the gears can be enhanced as compared with conventional manufacturing through several processes. An enhancement in strength can also be obtained as compared with cases manufacturing with conventional silicon wafer. Moreover, because high dimensional precision makes eccentricity of the central hole of gears reduced, when an accelerating gear train 110 is composed by the gears, indication departure of a second hand 9 is controlled surely, leading to an enhancement in precision of time display. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
