What are the main aspects of microfilm content inspection?

Microfilm content inspection mainly includes the following aspects:

1, high storage density, mature technology and high stability.

Microfilm technology is an "ancient technology" with a history of more than 100 years, and its record carrier and equipment are completely mature and stable. The reduced image of the original is recorded on microfilm by photography. Generally, the reduction ratio is 65,438+0/7 to 65,438+0/48, and the ultra-high reduction ratio is 65,438+0/90 to 65,438+0/250.

The reduced image with ordinary reduction ratio is 1/49- 1/2 304 of the original area, and the reduced image with ultra-high reduction ratio is1/8100-1/62500 of the original area. The storage density of microforms is similar to that of current optical discs. A warehouse file with tens of thousands of volumes can be saved only by one or two filing cabinets after microfilming.

2. Good recording effect and long service life.

History has proved that microfilm can be preserved for nearly a hundred years, and now the life of polyester film can exceed 500 years. Even if the film is damaged in use, such as scratching and breaking, only a limited number of frames are lost, and most of the information is not affected. This is irreplaceable by modern digital products. When shooting documents, books and materials with microfilm technology, the original appearance of the original shape, content, format, font and graphics can be faithfully recorded on microfilm, forming a reduced image exactly the same as the original. Microform technology has complete international and domestic standards, which can not only ensure the processing quality, but also bring convenience to its wide application.

3, the application range is wide

Microfilm is an information carrier that records the information on the original on microfilm through photography. Because camera lens and microfilm have good imaging and recording performance, all kinds of readable originals (words, photos and charts, etc. ) can be recorded on microfilm under visible light.