著者

山口 意颯男 仲本 正紀

出版者

公益社団法人 応用物理学会分科会 日本光学会

雑誌

光学 (ISSN:03896625)

巻号頁・発行日

vol.1, no.2, pp.70-76, 1972-04-25 (Released:2010-03-15)

参考文献数

5

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A high spatial frequency modulation transfer function (MTF) of a lens has been obtained by scanning a line image with a knife edge. Practical limit of the spatial frequency for a camera lens is about lOO/mm at the utmost. However, this apparatus, aiming at measuring high resolution lenses, can measure MTF's at the spatial frequency up to 1, 000 1ines/mm. To design this apparatus, the following components have been developed a knife edge using 18-carat gold, a moving coil type scanner, a digital-to-analogue converter type scanner driver circuit and a slit. The MTF was measured at the spatial frequency of 500 1ines/mm on the axis of the lens under test within 5% discrepancy to the calculated value.