| 摘要 |
A graticule scale for a cathode ray tube is described which is made of a light reflecting material of chromatic color in the wavelength range of 5850 to 6500 angstroms, such as an orange of 6010 angstroms. The graticule scale may be provided on the inner surface of the flat glass faceplate of such tube and illuminated by light from an external source transmitted through the outer edge of such faceplate. The graticule scale of the present invention has the advantage that it is easily visible both in conditions of high ambient lighting due to its chromatic color and when used as a lighted graticule for photography purposes or for viewing in a dark room.
|
