Continued from Citizen to Launch 'World's Most Accurate' Quartz Wristwatch (1)

High-frequency quartz oscillator employed

The back side of the case. It has a see-through structure. (source: Nikkei xTech)

For the new quartz wristwatch, Citizen used a different oscillator. Specifically, it employed an "AT cut-type" quartz oscillator in place of a "tuning fork-type" quartz oscillator. The frequency of the AT cut-type quartz oscillator is 8.4MHz, which is 256 times higher than that of the tuning fork-type quartz oscillator (33kHz). The higher the frequency of quartz oscillator, the easier it becomes to improve accuracy.

Also, the AT cut-type quartz oscillator has excellent temperature properties and a high stability at a temperature of -5 to 40°C (it is not distorted much). Furthermore, it is not much affected by gravity, whose influence changes depending on the position of the arm, or aged deterioration.

The problem of power consumption was solved by combining low-power consumption technologies that Citizen has built up so far. With those measures, the new quartz wristwatch realizes a high accuracy, and its margin of error is less than one second (0.9855 seconds) even after one year of use.

Citizen will offer a limited number of the product (100 units), emphasizing its rarity. Its case is made of 18-karat gold (ratio of gold: 75%), and its band is made of alligator leather. The diameter and thickness of the case are 37.5 and 9.1mm, respectively.

Original Japanese article