水晶置時計
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概要
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This paper relates to a transistorized and dry-battery driven crystal clock "Citizen Crystron" which has been developed in our laboratoryi, and gives an outline of this clock with an emphasis on the explanation about the driving method of the synchronous motor by which the clock is characterized. The synchronous motor is in a type of magnetic escapement, and the reed resonator which has a natural frequency is driven in synchronism with the output signal of the crystal oscillator. In the method of driving the reed, there are two principal cases as given below. Case 1; The synchronizing signal is injected into the self-oscillation circuit of the reed. Case 2; The reed is driven directly with the synchronizing signal. After the experimental researches, it has been ascertained that case l gives a better result as far as the self-starting characteristic of the reed is concerned, but its stability is worse than that in case 2. Further, in case 2, we have made an experimental Study on a comparison of the characteristic stability under two different conditions, i.e. width of the reed-driving pulse is T/2 and T/4. (T is the period of driving pulse.) According to the result, it is proved that the following merits are brought under the condition of the wider pulse. 1; Less decrease of the output torque which is accompanied with detuning of the reed's natural frequency. 2; Rarer occurrence of step-out trouble caused by noise. 3; Simpler composition of the driving circuit. The driving method in case 2 with the wider pulse. therefore, is adopted finally in this crysta1 clock.
- 一般社団法人日本時計学会の論文
- 1968-06-10