Journal of the Horological Institute of Japan

[title in Japanese]

Article type: Cover
1987 Volume 122 Pages Cover1-
Published: September 20, 1987
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.122.0_Cover1

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[title in Japanese]

Article type: Cover
1987 Volume 122 Pages Cover2-
Published: September 20, 1987
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.122.0_Cover2

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Vibration Character of Coil Spring with Link Mechanism

Osamu SENDA, Takeshi KASAHARA

Article type: Article
1987 Volume 122 Pages 1-13
Published: September 20, 1987
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.122.0_1

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An experimental study has been conducted on vibration character of a coil spring equipped with a link mechanism. This spring is that usually used for scales. The results show the asymmetry of the resonance curve in amplitude versus frequency, and the dependence of the resonance frequency on amplitude. As for the resonance curve, the bottom patern has a tendency to spread further on the higher frequency side than on the lower frequency one. This is not the case usually observed in other types of vibrators such as free suspended coil spring and cantilever vibrator etc. While, the resonance frequency is proved to be much dependent on the amplitude. These phenomena are considered to be attributed to the mechanical friction contained in the mechanical system.

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Oscillation Frequencies by Output Resistance in a CMOS Quartz Crystal Oscillation Circuit for a Wrist Watch

Hirofumi KAWASHIMA, Hiroyuki TOMITA

Article type: Article
1987 Volume 122 Pages 14-24
Published: September 20, 1987
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.122.0_14

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This paper describes the oscillation frequencies by output resistance in a CMOS quartz crystal oscillation circuit for a wrist watch. A tuning fork type quartz crystal resonator with the frequency of 32.768 kHz is used for wrist watches, because this resonator has advantages of low frequency(low power consumption), miniaturization, high shock-resistance and the existing zero temperature coefficient. However, the resonator vibrates in unwanted spurious modes by the conditions of various constants in a CMOS quartz crystal oscillation circuit, because there exsist unwanted spurios vibrations to be excited by the same electrode. The object of this paper is to suppress the unwanted spurious vibrations, particularly the second overtone vibration. As a result of this study, it is understood that the output resistance suppresses the overtone vibrations, because it changes the retured ratios of each mode. Namely, in this paper, the returned ratios in the quartz crystal oscillation circuit are derived as a function of equivalent electrical constants for a quartz crystal resonator, and the relationship between the returned ratios and the output resistance is made clear.

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Electrical Equivalent Circuit and a Theoretical Analysis on Dependence of Load Capacitance for the Coupled Flexural-torsional Resonator

Hirofumi KAWASHIMA

Article type: Article
1987 Volume 122 Pages 25-37
Published: September 20, 1987
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.122.0_25

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This paper describes a theoretical analysis on the electrical equivalent circuit and the dependence of load capacitance for the coupled flexural-torsional quartz crystal resonator. It is well known that the flexural-torsional quartz crystal resonator has a cubic curve in frequency temperature characteristics. First of all, it is conceivable that a flexural-torsional quartz crystal resonator is a resonator where electrical coupling and elastic internal coupling coexists, and the coupling of both vibrations is examined as capacitance coupling. Next, the load capacitance C_L is connected to the obtained electrical equivalent circuit in series, and furthermore the electrical equivalent constants are calculated as a function of C_L by performing circuit transformation. Particularly, the examination of C_L dependence for coupling capacitance is made, and also the detailed examination of the influence in frequency temperature characteristics is made. As a result, as C_L increases, the first order temperature coefficient α increases. In particular, as C_L becomes small, change rate of α against C_L becomes large. From this, it is shown that α can be made equal to almost zero by the choice of C_L.

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A Passivation Technique for High Density Packaging

Osamu SUGANO, Masahisa YAMASHITA

Article type: Article
1987 Volume 122 Pages 38-46
Published: September 20, 1987
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.122.0_38

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Generally, the integrated circuits consist of the device area and the area for connection with the other substrates via contact pads. This connection area usually occupies 20〜30 percent of the whole IC area which is a great drawback for the IC size reduction. By forming contact pads on the insulating film over the device area, the connection area can be virtually eliminated and this structure allows the application of various packaging techniques. We have developed the insulating film which is endurable with the mechanical damage due to the IC inspection probes or the pressure at wire bonding. Also, the planarization of this film have been achieved to meet the need for further device mounting.

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[title in Japanese]

[in Japanese]

Article type: Article
1987 Volume 122 Pages 47-53
Published: September 20, 1987
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.122.0_47

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[title in Japanese]

[in Japanese]

Article type: Article
1987 Volume 122 Pages 54-55
Published: September 20, 1987
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.122.0_54

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