Journal of the Horological Institute of Japan

[title in Japanese]

Article type: Cover
1978 Volume 84 Pages Cover1-
Published: March 25, 1978
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.84.0_Cover1

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[title in Japanese]

Article type: Cover
1978 Volume 84 Pages Cover2-
Published: March 25, 1978
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.84.0_Cover2

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Motion of a Printer-hammer driven by an Electric magnet

[in Japanese], [in Japanese]

Article type: Article
1978 Volume 84 Pages 1-11
Published: March 25, 1978
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.84.0_1

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Fig. 1 shows an electric magnet, an armature, a hammer and a typewheel which are used in a high speed printer. When the magnet is actuated by the electric current, the magnet pulls and accelerates the armature. After a movement of short distance L, the top of the armature hits the hammer, and then the hammer runs and strikes the typewheel with certain given kinetic energy. Is the short gap L between the top of the armature and the hammer useful or harmful ? This is the question which this research aims to answer. The results are as follows. If several conditions are all suitably chosen, the hammer energy in the case of suitable gap L becomes larger than the energy in the case of no gap. But if the conditions are not suitable, the hammer energy in the case of small gap L becomes less than the energy in the case of no gap. The conditions which give the usefulness of the gap L are very strict, and the, authors hesitats. to recommend the usefulness of these most favorable conditions. Practically conditions with.no gap are recommended.

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A Small Size Quartz Oscillator for Watch

Hiroyuki Uematsu, Makoto Wakasugi

Article type: Article
1978 Volume 84 Pages 12-21
Published: March 25, 1978
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.84.0_12

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We have developed a small quartz oscillator for the watch which is a turning fork with a prong size of 45×0.4×0.25mm^3. In the first part of the paper, the characteristics of the oscillator are stated. In the last part, the analytical results of tained through the finite element methed are described. Analysis is done of the following two items; (1) The influence to the elastic vibration of the york due to the unbalance of the plong size, (2) The available pattern of the electrode concerning the space charge density in the quartz.

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Optical Measurements of Magnetization Mode

Akira Kikuyama, Shinji Sawada

Article type: Article
1978 Volume 84 Pages 22-34
Published: March 25, 1978
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.84.0_22

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Our deVelopment of a Double Stator type pulse motor for quartz watches is one of the applications of rare earth cobalt magnets having excellent magnetic characteristics. Further study has verified that a technique for effectively magnetizing of a rotor will be of a great use for producing a smaller-sized, higher-torque motor. In a course of improving this technique, an observation system which enables the indication of the magnetization status as a pattern, has become essential. This paper describes the magneto-optical measurements with MnBi thin films in the following sequence. 1. Comparison of various systems for measuring a magnetic field 2. The observation principle and system for the magnetization mode on a rotor in which Kerr effect is applied with MnBi thin films 3. The domain structure and the magnetic characteristics on MnBi thin films 4. Observations

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[title in Japanese]

[in Japanese], [in Japanese]

Article type: Article
1978 Volume 84 Pages 35-42
Published: March 25, 1978
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.84.0_35

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We have developed a new miniature quartz crystal vibrator by applying lithographic Process. This lithographic process, a micro photo-processing also used in IC production, enables mass-production of vibrators through batch treatmentas well as miniaturization of them. However, a high impedance had been the disadvantage of the vibrators produced by this processe. We have succeeded in lowering impedance of the vibrators by adopting a new electrode configuration onto the + 5°X cut quartz crystal plate. The vibrator we present here is thus put into practical use and consequently makes possible an extrem miniaturization of quartz watch.

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Development of sound generator for wrist watch.

Fumikazu Murakami

Article type: Article
1978 Volume 84 Pages 43-59
Published: March 25, 1978
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.84.0_43

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A new made sound generator for wrist watch exhibits satis factory performance. The construction of the driving parts is shown in Fig,1. They consist of electromagnetic transducer and two vibrating plates. The use of highly efficient SmCo5 magnet has made it possible to construct the transducer parts so small that can be placed in a wrist watch. The first vibrating plate has an iron weight and vibrates by the act of electromagnetic drivirg force. Small air chamber transmits the vibrating pressure to the second plate, and thus the 2nd plate is made into vibration and transmits sound waves into the air. The 2nd plate has also a role of assuring watertightness of the watch case. Frequency characteristics of the generator are shown in Fig,3. Vibration coupling of the 1st plate, 2nd plate and also the cavity formed by the outer case-back makes three peakes of frequncy charactevistics curve and thus broad frequency range can be employed. In designing of this sound generator, the finite element method is applied to analyze the resonance frequency of the plate and magetic field. By subsituting the physical values obtained by the above analyses into the equi valent electro-acoustic circuit of the transducer, it becomes possible to estimate, the characteristics of this sound generator.

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[title in Japanese]

[in Japanese]

Article type: Article
1978 Volume 84 Pages 60-65
Published: March 25, 1978
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.84.0_60

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[title in Japanese]

[in Japanese]

Article type: Article
1978 Volume 84 Pages 66-74
Published: March 25, 1978
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.84.0_66

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[title in Japanese]

[in Japanese]

Article type: Article
1978 Volume 84 Pages 75-87
Published: March 25, 1978
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.84.0_75

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