| 摘要 |
PURPOSE:To reduce thickness and improve waterproofness by providing a disclike button on the back cover. CONSTITUTION:An annular corrugated diaphragm 11 is formed into one body in the peripheral part of a disclike operating button 4 and is continuous to a back cover 8. Then, if the button 4 is pushed, a contact 10 for time correction is conducted. It is equally well to make the button 4 and the diaphragm 11 by molding part of the back cover 8. Thereby, the thickness of the button 4 and the thickess of the cover 8 are made the same, and the one body construction which does not use any O-ring, lubricating oil, and the like at all is realized, with resultant higher waterproof effect. |
