Journal of the Horological Institute of Japan

[title in Japanese]

Article type: Cover
1994 Volume 151 Pages Cover1-
Published: November 25, 1994
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.151.0_Cover1

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[title in Japanese]

Article type: Cover
1994 Volume 151 Pages Cover2-
Published: November 25, 1994
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.151.0_Cover2

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Manufacture of Astronomical Precise Sundial

Hideo UEHARA

Article type: Article
1994 Volume 151 Pages 1-10
Published: November 25, 1994
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.151.0_1

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Until now, the sundial has hardly been made especially in pursuit of accuracy and function. The typical sundial indicating the time at the angle of the shadow of edge lines has no structure to correct the atmospheric refraction. On the other hand, the sundial using a two-dimensional dial for reading at the center position of the shadow of a sphere provides a precise design so that not only the time difference by equation of time and longitude but also atmospheric refraction can be corrected. This"astronomical precise sundial"uses a two-dimensional dial, and it is a precise and highly functional sundial designed and manufactured in pursuit of the possiblity of the sundial from the viewpoint of astronomers. As the functions of this sundial, the local sidereal time can be directly read for the first time in the world, and the various information such as the sunrise and sunset times and the azimuth and altitude of the sun can be obtained.

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Simulation of the Motion of Stepping Motor for Time Piece : 4th Report

Jie ZHU, Tomio KOTAKI

Article type: Article
1994 Volume 151 Pages 11-23
Published: November 25, 1994
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.151.0_11

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This paper concentrates mainly on the determination of unknown simulation parameters of the lumped magnetic circuit. The simulation is still based on the equations of the motion of stepping motor for time piece introduced in the 3rd Report and it refers to the coil-current curves and other experimental data obtained from sample motors for clock.

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Development of Digital Temperature Compensated Quartz Crystal Oscillator at 10MHz-band

Yasuhiro SAKURAI, Hiroyuki FUKAYAMA

Article type: Article
1994 Volume 151 Pages 24-32
Published: November 25, 1994
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.151.0_24

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Digital Temperature Compensated Crystal Oscillator (D-TCXO) has been developed for mobile and portable two-way communication equipments with a ROM table method using MONOS memory that is highly reliable EEPROM. The D-TCXO utilizes a custom designed one-chip LSI that is made up of several remarkable circuit blocks in order to provide temperature performance of ±1 ppm in a range from -30℃ to +90℃. Included in this paper are description of the compensation circuit and the typical performance characteristics.

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An Attempt to extend Wacth Functions by Personal Computer

Hiroyuki KIHARA, Tomomi MURAKAMI, Kazuya MITAKI

Article type: Article
1994 Volume 151 Pages 33-40
Published: November 25, 1994
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.151.0_33

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Watches are increasingly regarded as small information equipment these days in terms of their compactness and portability. However, watches themselves are still insufficient for use as small information equipment. An attempt was made to enhance the serviceability of watches as small information equipment by using a personal computer to make up for their insufficiency. The system is comprised of a watch with a depth gauge, a personal computer, and an interface unit that acts as an intermediary for the watch and personal computer. Depth data, water temperature data, and log data collected during the elapsed time and read into a watch with a epth gauge are transmitted to a personal computer. The personal computer processes, stores, and displays those data, thus permitting the utilization of the portability of a watch and the data processing capacity of a personal computer.

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A Development of CAD/CG System for Watch Design

Makoto WATANABE

Article type: Article
1994 Volume 151 Pages 41-52
Published: November 25, 1994
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.151.0_41

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This paper describes a development of CAD/CG system for watch design. Implementation of CAD systems started in the Mold Design Section in 1984, in the Product Design Section in 1986 and in the Design Section in 1988. CG system started in the Design Section at the same time. These systems developed for watch design are useful in a watch design process, from detailed design to design evaluation. We obained two advantages by the implementation of CAD/CG systems in watch design process. First : The new product development period has been reduced to 17% as compared to the development period before the CAD/CG implementation. Second : The number of prototypes per models has been reduced to 50% after 3D modeling.

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An Attempt of the Unmanned Factory by"Q-Molding System"

Kenji KAMIO

Article type: Article
1994 Volume 151 Pages 53-63
Published: November 25, 1994
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.151.0_53

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Under the circumstances of"strong YEN", the market demands the effective manufacturing system to reduce production cost, the flexible manufacturing system to cope with the short life cycle of products, and the reduction of labor cost and of goods in stock. So, we developed"Q-System"and"Q-Molding System"to solve the problems as abovementioned. The"Q-System"is a quickly exchangeable cassette mold considered to make the total cost of the molds, moldings, and their distributions minimum. The"Q-Molding System"we developed is an automatic molding system to construct the unmanned factory by use of the"Q-System".

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[title in Japanese]

[in Japanese]

Article type: Article
1994 Volume 151 Pages 64-77
Published: November 25, 1994
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.151.0_64

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[title in Japanese]

[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...

Article type: Article
1994 Volume 151 Pages 78-99
Published: November 25, 1994
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.151.0_78

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