Aberration-corrected catadioptric magnifiers useful for simple microfiche readers |
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Authors: | M Vxxx R K Murty N C Das R P Shukla |
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Institution: | (1) Centro de Investigaciones en Optica A.C., Apartado Postal 948, Codigo Postal, 37000, Leon, Guanajuato, Mexico;(2) Spectroscopy Division, Bhabha Atomic Research Centre, 400 085 Trombay, Bombay, India |
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Abstract: | The present paper considers the magnifying power and aberration properties of three different catadioptric magnifying systems
useful for application as simple hand-held microfiche readers. These are in the form of a plano-convex lens, a meniscus lens
and an achromatic doublet lens and all their outer surfaces have been coated with a semi-reflecting film so that they behave
like catadioptric elements. These can be designed to give magnification in the range of 15 × to 25 × with sufficient eye relief.
Using such magnifiers, it is possible to read microfiche having frame sizes of 16 × 12 mm and 12 × 9 mm. The cemented achromatic
doublet coated on the outer surfaces seems to give a very good image for use in microfiche reader. |
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Keywords: | Microfiche reader magnifier catadioptric system lens |
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