A general study of old mirrors by the three-dimensional digital archive technology

对于《三国馆新宿》的研究，在前人研究的基础上积累了许多成果，如关于农家图像学的研究、关于同型镜关系的研究等，作为这些研究基础的考古遗存如何观察和记录正在发生变化。拓片自古以来就被使用，下一张飞机照片则用了一个大相机，它变成了在飞机照片上加了观测记录的图纸。针对目前普遍采用的拓片、照片、平面图等二维信息加横截面的记录，应用精密测量技术和数字化技术，建立了反射镜的三维数字化数据库。并对约600名青铜矿工进行了实物观察和三维数字化测量，收集了全国各地发现的铜镜资料，手持时进行了三维观察，并在计算机中进行了对比，积累了精确的地面平面图和截面图。同时，利用三维数字档案馆的新的观察方式的提出，也为许多人，包括一些有机会观察实物的研究人员，提供了一个研究镜子的新环境。

As for the study of “Sankakuen shinjukyd", many results are accumulated by former study such as the study about farm iconography the study about the relation of the same mold mirror, and so on How to observe and recordthe archaeological remains which became these research bases was changing. Rubbing have been used since old days, next plane photograph used a big camera Then, it changed to the drawing which added an observation record in the plane photograph. At prent the record that two-dimensional information such as rubbing, photograph, and plan drawing in addition to a cross section was used generally.In contrast with such a usual method, we have built the three-dimensional digital database of the mirror applied precise measurement technology, and digitization technology. And we have observed the real things and have did three-dimensional digital measurement of about 600 bronze miners (“Sankakuen shinjukydo" about 250 bronze mirrors is contained).We collect data of mirrors discovered from the whole country, observe three-dimensionally as it is taken in our hands, compare some mirrors, and accumulate precise ground plan and cross section with expanding in the computer. It becomes new environment to study mirrors at the same time, for many people, including researcher who has a few opportunities to observe real thing, by the proposal of new way of observing which make use of three-dimensional digital archives.