Journal of the Horological Institute of Japan

[title in Japanese]

Article type: Cover
1995 Volume 153 Pages Cover1-
Published: June 25, 1995
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.153.0_Cover1

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[title in Japanese]

Article type: Cover
1995 Volume 153 Pages Cover2-
Published: June 25, 1995
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.153.0_Cover2

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[title in Japanese]

[in Japanese]

Article type: Article
1995 Volume 153 Pages 1-
Published: June 25, 1995
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.153.0_1

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Nickelless Gold Alloy Plating for Watch Outer Parts

Teruo SUZUKI, Kazumasa SHOUJI, Yukari OSHIMA

Article type: Article
1995 Volume 153 Pages 2-10
Published: June 25, 1995
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.153.0_2

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In Germany, Denmark and Austria, the regulations make advances in the effect to prevent nickel allergy. We developed Au-Fe alloy plating for nickelless gold plating of watch outer parts. The plating bath consists of gold compound, iron compound, titanium compound and brightening agent. The electrodeposit is Au-Fe alloy of iron content 1.6〜2.0wt%. The Au-Fe alloy plated watch parts have satisfactory quality in color, ware resistance and other characteristics.

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Development of a Measurement System with a 1.5V Battery Power Supply.

Kazuya MITAKI

Article type: Article
1995 Volume 153 Pages 11-22
Published: June 25, 1995
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.153.0_11

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We have successfully developed a new measurement system for the depth meter watch and the altimeter watch equipped with the pressure sensor, which can operate with an only 1.5V silver oxide battery power supply. This measurement system has the newly developed successive approximation A/D conversion circuit and 3V pressurized power circuit, and is installed in the sports watch series with the sensor of the Citizen Watch Co., Ltd. Which aims at low and moderate price range.

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Development of Combination Watch with Multi-Hand

Toshio HIRUTA

Article type: Article
1995 Volume 153 Pages 23-35
Published: June 25, 1995
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.153.0_23

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The digital display of a combination watch in which an analog and a digital watch are integrated has been furnished with an increasing number of functions, like in the case of digital watches with display of a variety of functions. However, the analog display of most of such watches is used to be only for time display. Under these circumstances, combination watches with multi-hand Cal.C300 and Cal.C310, combination watches equipped with a three-motored multi-hand/multi-functional analog watch, have been developed. The purpose of the current development of such watches and their features are summarized as follows: (1) Introduction of a multi-hand/multi-functional analog watch into a combination watch ・A three-motored multi-hand/multi-functional analog watch have been adopted and hands are made so as to be independently driven by respective motors in order to permit display of a variety of functions in the analog display section. (2) Organic combination of analog and digital display ・The analog and digital display are synchronized completely so that time correction for the digital display will lead to automatic simultaneous time correction of the analog display. ・The touch of button permits exchange of the analog and the digital display that either the analog or the digital display can be selected for desired display, as well as for display of functions. ・Combined display of the same function in the analog and digital display section permits display of new functions. (3) Easy-to-use combination watch ・The details of push-button operation are displayed in the digital display to facilitate switch operation. ・Shift of hands from the digital display section, whenever the need arises, eliminate difficulty in viewing the digital display section due to overlapping hands.

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Behavior of Sub-Vibration for NS-GT Cut Quartz Crystal Resonators.

Hirofumi KAWASHIMA, Masaru MATSUYAMA

Article type: Article
1995 Volume 153 Pages 36-46
Published: June 25, 1995
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.153.0_36

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This paper describes the behavior of sub-vibration for NS-GT cut quartz crystal resonators. The NS-GT cut resonators for principal vibration consisting of a vibrational portion and supporting portions show the best frequency temperature behavior of all quartz crystal resonators. Frequency temperature behavior for principal vibration is improved by coupling length-extensional mode of sub-vibration to width-extensional mode of principal vibration. So far, the report has not been made on the behavior of sub-vibration which plays an important role to frequency temperature behavior of principal vibration. In this paper, the behavior of sub-vibration versus cut angle and width-to-length ratio is clarified. As a result, the first order temperature coefficient α_ of sub-vibration is found to be very dependent upon cut angle and width-to-length ratio. In addition, α_ reaches approximately zero when cut angle φ is 60°.

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Development of MessageWatch (Information Receiver) by FM subcarrier

Shunsuke KOYAMA, Shogo KUROSAWA

Article type: Article
1995 Volume 153 Pages 47-60
Published: June 25, 1995
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.153.0_47

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The SEIKO Message-Watch is a SEIKO electronic wristwatch that combines an easy-to-use yet versatile pager with a personal information receiver. It receives the internationally standerdized FM subcarrier signals. So, the communications are currently working to establish paging networks in all countries of the world. It's also one of the most accurate wristwatches, it receives time updates from the U.S. Bureau of Standards many times each day. This paper gives outline of the Message-Watch Cal.MA520 and the Receptor system.

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Basic Research Laboratory Nano Machine

Kiyoshi Sawada

Article type: Article
1995 Volume 153 Pages 61-69
Published: June 25, 1995
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.153.0_61

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A super precision milling machine with the Non-Friction Servo System, which has nano-meter resolution positioning capability, was applied to the combined precise machining of a micro size mechanical component. A φ1mm Noh-mask was milled with a single crystal diamond cutting tool as an example.

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[title in Japanese]

[in Japanese]

Article type: Article
1995 Volume 153 Pages 70-83
Published: June 25, 1995
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.153.0_70

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[title in Japanese]

[in Japanese]

Article type: Article
1995 Volume 153 Pages 84-90
Published: June 25, 1995
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.153.0_84

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[title in Japanese]

[in Japanese]

Article type: Article
1995 Volume 153 Pages 91-95
Published: June 25, 1995
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.153.0_91

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