Device for inspecting an interference filter for a projection te

Details Device for inspecting an interference filter for a projection te Device for inspecting an interference filter for a projection te

1989-03-28

1991-01-29

Evans, F. L.

Optics: measuring and testing

By shade or color

350166, 356416, 356418, 356419, G01N 2100

Patent

active

049882031

ABSTRACT:
In a device for measuring the cut-off wavelength of an interference filter for a projection television display tube, the interference filter and a bandpass filter are arranged one behind the other. The bandpass filter has a transmission characteristic with a cut-off wavelength which approximately coincides with the desired cut-off wavelength of the interference filter, but with a slope varying in the opposite direction. A white light beam generated in a light source is incident through the two filters. The intensity, which is measured by a detector on the other side of the filters, is a measure of the cut-off wavelength of the interference filter. The device may have a second measuring system for measuring the absorption of the interference filter.

REFERENCES:
patent: 2624238 (1953-01-01), Widdop et al.
patent: 2936732 (1960-05-01), Ring et al.
patent: 4634926 (1987-01-01), Vriens et al.
patent: 4798994 (1989-01-01), Rijpers et al.
patent: 4804884 (1989-02-01), Vries et al.

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