An Apertureless Optical System for Sound on Film
An optical system which uses positive and negative cylindrical lenses with their axes at right angles is described. The image of a source is optically elongated and flattened by these cylindrical lenses to the proportions desired, and is then focused on the film. Advantages are: maximum possible brilliancy with a given source temperature; not sensitive to position of the lamp filament; sharpness of image; and intrinsically perfectly uniform brilliance throughout the length of the beam.
- Print ISSN
- 0097-5834
- Published
- 1931-12
- Content type
- Original Research
- DOI
- 10.5594/J07491
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