发明名称 Electronic timepiece
摘要 <p>To provide an electronic timepiece enabling reliable detection of a state of rotation of an indication wheel such as a date dial. An ultrasonic motor 1130 has an ultrasonic rotor pinion 1134b. A date dial 1120 is disposed on a main plate 1102 in such a way as to rotate relative thereto. The ultrasonic rotor pinion 1134b is meshed with an intermediate date driving gear wheel 1142a. A date driving wheel 1150 is rotatably disposed on the main plate 1102. A date driving gear wheel 1150b is meshed with an intermediate date driving pinion 1142b. A date driving gear portion 1150b is meshed with a dial gear portion 1120a. A contact point spring 1160 is disposed on a spring guiding portion 1150d. The contact point spring 1160 rotates integrally with the date driving wheel 1150 through the rotation of the date driving wheel 1150. The state of rotation of the date driving wheel 1150 can be detected by contact of the contact point spring 1160 with the contact point pattern 1174. &lt;IMAGE&gt;</p>
申请公布号 EP0874292(A2) 申请公布日期 1998.10.28
申请号 EP19980303226 申请日期 1998.04.27
申请人 SEIKO INSTRUMENTS INC. 发明人 NAKAJIMA, KENICHI;SATODATE, TAKAYUKI;MATOUGE, AKIHIRO;INADA, AKIHIKO;ISHII, MITSURU;KOYAMA, YOSHIO;SUZUKI, SHIGEO;KAWATA, MASAYUKI;SASAKI, YUKO;TAKAKUWA, ERIKO
分类号 G04C3/12;G04C17/00;(IPC1-7):G04C3/14 主分类号 G04C3/12
代理机构 代理人
主权项
地址