Journal of the Horological Institute of Japan

[title in Japanese]

Article type: Cover
1981 Volume 97 Pages Cover1-
Published: June 20, 1981
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.97.0_Cover1

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[title in Japanese]

Article type: Cover
1981 Volume 97 Pages Cover2-
Published: June 20, 1981
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.97.0_Cover2

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Applicasion of Electromagnetic Micro-Speaker for Wristwatch

Yoshiaki Hara

Article type: Article
1981 Volume 97 Pages 3-14
Published: June 20, 1981
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.97.0_3

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To meet consumers' increasing demand toward a better style smaller alarm watch, a small thin electromagnetic speaker has been developed. The speaker is 8 mm in diameter and l.9mm in height. In this paper the structure of the speaker is described. the acoustical property of the speaker has been improved and the speaker can be mounted in an ordinary water resistant watch, by attaching a resonator including a sound emitting vibration plate made of plastic. The speaker can also be mounted in a special 100m diver watch by replacing the material of the sound emitting vibration plate by titanium. Acountical properties of the speaker are simulated by using equivalent electric circuit, and the simulation results are in good agreement with measured acoustical properties.

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Development of Ultra Thin Crystal Resonator Unit

Isao shinoda, Hideo Tabata

Article type: Article
1981 Volume 97 Pages 15-24
Published: June 20, 1981
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.97.0_15

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We have succeeded in development of the thinnest crystal resonator unit in the world. The thin unit comprises a frame-resonator having a resonator and a supporting frame one-body-formed by means of photo-lithographic process, two containers half-etched on one side of quartz plates, and sheets of solder put between the containers and the frame-resonator, and is packaged in vacuum with heat. In order to accomplish the unit, several conditions for formation of metal film layers for enclosure in vacuum, transparence of half-etched surfaces of two containers, and the enclosure in vacuum, were determined by various experiments. These units are used in thin-small size analogue quartz watches for lady's use of Caliber 6720.

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A Consideration of Silver oxide battery lives in Wearing

Tomoyuki Aoki

Article type: Article
1981 Volume 97 Pages 25-38
Published: June 20, 1981
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.97.0_25

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It is important to estimate the distribution of silver oxide battery lives in wearing of electronic wrist watches. Parametets determining battery lives are capacity, self-discharge, consumption current, wearing temperature. But now, high accurate estimation of battery lives is not fixed perfectly because it is difficult to seize properties of self-discharge and wearing temperature. This paper reviews the consideration of parameter contribution to battery lives and high accurate estimation of battery lives from result of wearing tests.

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[title in Japanese]

[in Japanese]

Article type: Article
1981 Volume 97 Pages 39-45
Published: June 20, 1981
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.97.0_39

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[title in Japanese]

[in Japanese]

Article type: Article
1981 Volume 97 Pages 46-48
Published: June 20, 1981
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.97.0_46

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