8 with respect to the relative depth of a groove in the back cover, and Figure 10 is a sectional, perspective view of a back cover of a second embodiment of a watch according to the present invention.Ī driving circuit for driving a piezo-electric buzzer of the type shown in Fig. 2 driven at various frequencies, Figure 7 is a graph showing part of a frequency characteristic of one embodiment of a buzzer of a watch according to the present invention, Figure 8 is a sectional, perspective view of back cover of one embodiment of a watch according to the present invention, Figure 9 is a graph of the natural frequency of a back cover such as that shown in Fig. 2, Figures 4, 5, and 6 are graphs showing the frequency characteristics of various buzzers such as that shown in Fig. The present invention is illustrated, merely by way of example in the accompanying drawings, in which:- Figure 1 is a sectional view of a watch having a piezo-electric buzzer in which, in contrast to the present invention, the piezo- electric unit is attached to the cover glass, Figure 2 is a sectional view of a watch of the type with which the present invention is concerned having a piezo-electric buzzer in which the piezo-electric unit is attached to the back cover of the watch, Figure 3 is a driving circuit for a piezoelectric buzzer such as that shown in Fig. ![]() ![]() G04C21/34- Devices on watches or similar portable timepieces.G04C21/16- Producing acoustic time signals by electrical means producing the signals at adjustable fixed times.G04C21/00- Producing acoustic time signals by electrical means.G04C- ELECTROMECHANICAL CLOCKS OR WATCHES.G04G13/02- Producing acoustic time signals at preselected times, e.g.G04G13/00- Producing acoustic time signals.Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority claimed from JP3198380A external-priority patent/JPS56128479A/en Priority claimed from JP55159950A external-priority patent/JPH0117119B2/ja Application filed by Suwa Seikosha KK filed Critical Suwa Seikosha KK Publication of GB2071883A publication Critical patent/GB2071883A/en Application granted granted Critical Publication of GB2071883B publication Critical patent/GB2071883B/en Status Expired legal-status Critical Current Links Original Assignee Suwa Seikosha KK Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) ( en Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Granted Application number GB8104459A Other versions GB2071883B Google Patents Watch having a piezo-electric buzzerÄownload PDF Info Publication number GB2071883A GB2071883A GB8104459A GB8104459A GB2071883A GB 2071883 A GB2071883 A GB 2071883A GB 8104459 A GB8104459 A GB 8104459A GB 8104459 A GB8104459 A GB 8104459A GB 2071883 A GB2071883 A GB 2071883A Authority GB United Kingdom Prior art keywords watch back cover piezo buzzer electric Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents GB2071883A - Watch having a piezo-electric buzzer ![]() GB2071883A - Watch having a piezo-electric buzzer
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