| 摘要 |
PROBLEM TO BE SOLVED: To provide a parting plate capable of precisely positioning the parting plate with respect to a case, and the case and the parting plate being manufactured easily.SOLUTION: The parting plate includes: a first concavity and convexity portion 10 which is continuously formed along the inner circumferential surface of a wristwatch case 1 at a pitch smaller than a range of attachment error in a circumferential direction of a parting plate 3 with respect to the wristwatch case 1; and a second concavity and convexity portion 11 corresponding to the first concavity and convexity portion 10 of the wristwatch case 1, which is formed continuously along the outer peripheral surface of the parting plate 3 at the same pitch as that of the first concavity and convexity portion 10 to engage with the first concavity and convexity portion 10. Therefore, by engaging the first concavity and convexity portion 10 and the second concavity and convexity portion 11, the parting plate 3 can be disposed being positioned within the range of the attachment error in the circumferential direction with respect to the wristwatch case 1. Also, since the first concavity and convexity portion 10 and the second concavity and convexity portion 11 can be formed with the same configuration, the first concavity and convexity portion 10 and the second concavity and convexity portion 11 can be formed simply and easily on the wristwatch case 1 and the parting plate 3. |
