著者
赤尾 祐司
出版者
一般社団法人 日本時計学会
雑誌
マイクロメカトロニクス (ISSN:13438565)
巻号頁・発行日
vol.45, no.1, pp.27-33, 2001-03-10 (Released:2017-11-09)

With the purpose of improving performance of lubricant at low temperature and unifying lubricants to be used, we made new synthetic lubricant for watch mechamism. In this paper, we selected ester oil among several kinds of synthetic oils. We found that ester, as base oil, was superior in performance at low temperature and cahracteristic of evaporation rate, which has three ester groups in one molecule synthesized with tri-methylopropane and alkyl acid. We defined that the viscosity of the above mentioned lubricant should be 15cSt to 1000cSt at its used temperature range(-30 to 80°C). We found by evaluating performance of watches that the consumption electric current and the voltage to start moving with the lubricant at the used temperature are both almost same as with the existing lubricants. We also found by evaluating durability by accelerating test that the performance of the train wheel movement for twenty years is almost same. From the above we can obtain the new lubricant for watches which is superior in performance at low temperature and which we can apply for every part in watches.
著者
渡辺 滋 村上 淳 山田 信一
出版者
一般社団法人 日本時計学会
雑誌
マイクロメカトロニクス (ISSN:13438565)
巻号頁・発行日
vol.44, no.1, pp.25-31, 2000-03-10 (Released:2017-11-09)
被引用文献数
1

New type of self-generation watch(Eco-Drive Thermo)has been developed. Micro-thermoelectric generator set in this watch converts body heat to electric energy and drive this watch. Generator is consisted of 2,268 pairs of BiTe thermocouples in a square cm and has very high output-voltage of 0.8V/℃. From wearing experiments of this watch, average generation energy of 12μ W was estimated.
著者
上田 洵 志田 政春
出版者
一般社団法人 日本時計学会
雑誌
日本時計学会誌 (ISSN:00290416)
巻号頁・発行日
vol.92, pp.1-13, 1980-03-20 (Released:2017-11-09)

This paper describes an improved drive system of stepping motor, which contributes much to the decrease in current consumption of the existing stepping motor. We introduce here the Adaptive-Controlled Drive System, where the detecting method of rotation or non-rotation of rotor is the most important. This drive system permits us to design smart wrist watches with Center secorld & Calendar, reducing the current consumption of stepping motor to less than 1 μA; the value is a half or a third as large as that by the conventional drive system with the fixed pulse width. If the battery life of the watch is fixed, the capacity of the battery can be halved approximately. Namely, the effective life can be doubled at the same capacity. All the elements msed for this system are constituted within the IC driven at 1.57 V, and the system itself requires little (almost negligible) power consumption.
著者
青木 信裕 水津 考 小島 直
出版者
一般社団法人 日本時計学会
雑誌
マイクロメカトロニクス (ISSN:13438565)
巻号頁・発行日
vol.54, no.202, pp.11-16, 2010-06-10 (Released:2017-11-09)
参考文献数
1
被引用文献数
2

The hands of the analog watch can be thrown off by exposure to strong magnetism or impact. So we developed a new mechanism and algorithm of auto hand position correction for the analog watch. It detects the position of the hands periodically and adjusts them to the correct position if it discovers any discrepancy, and it corrects all three hands (hour, minute, and second hand) position by using one set of detection device.
著者
遠山 正俊 大谷 親
出版者
一般社団法人 日本時計学会
雑誌
日本時計学会誌 (ISSN:00290416)
巻号頁・発行日
vol.89, pp.40-51, 1979-06-20 (Released:2017-11-09)

A Relation between Q-value of a linear oscillator and its frequency stability is described here. When an external force in Roexp iωt (ω=ω_0+ω_1 : ω_0 resonance frequency of the oscillator: ω_l : random variable frequency) exerts on the oscillator with the resistant force proportional to its velocity, and when σ, variation of ωl, is greater than Δω(=ω_0/2Q), a calculation is tried by aid of statistical method. Moreover in this report, correlation fu-function of ω_1 is assumed to be quasi-static, that is the power spectrum of the external force is Gaussian type. And the following result is obtained. S=√<1/(2Q)(√<2/π>σ/(ω_0)-1/Q> where s is fractional frequency stability of the oscillator.
著者
青木 茂 宮沢 修 高橋 理
出版者
一般社団法人 日本時計学会
雑誌
日本時計学会誌 (ISSN:00290416)
巻号頁・発行日
vol.129, pp.55-64, 1989-06-20 (Released:2017-11-09)

This paper describes a new quartz watch driving system we developed. With this system, the second hand of a wrist watch moves smoothly as if it is sweeping. An intermittent movement of the stepping motor is transferred to a smooth sweeping motion due to the spiral spring and the viscous regulator. This system also allows the continued superiority of quartz watches.
著者
茂木 正俊 中田 克美 広瀬 信行
出版者
一般社団法人 日本時計学会
雑誌
マイクロメカトロニクス (ISSN:13438565)
巻号頁・発行日
vol.58, no.210, pp.7-18, 2014-06-10 (Released:2017-11-09)

We have developed a minute repeater mechanism based on the SPRING DRIVE movement. Within the limited dimensions of a movement, we have increased the duration time to a maximum and moreover, we have founded the means shown below in order to avoid the troubles caused by wrong operations of users. 1. By the means of two main spring barrels placed in series, we have increased the running time of the watch. 2. By modifying the minute repeater mechanism and turning it into the Sonnerie center wheel, it was possible to remove the minute repeaters spring and draw the mechanical energy directly from the main spring barrel. 3. While the minute repeater mechanism works, if the lever that releases the center wheel is used, the crown cannot be pulled out because it is equipped with a security system in order not to activate the minute repeater when the crown is in "pull out" position.