Display device with sliding back plates having an array of...

Details Display device with sliding back plates having an array of... Display device with sliding back plates having an array of...

G - Physics

04

C

58/20

G04C 19/00 (2006.01) G09F 9/37 (2006.01)

Patent

CA 1071880

Abstract of the Disclosure An opaque face plate has arrays of openings which are arranged to depict numerals when light is transmitted through predetermined openings. A plurality of back plates are slideably mounted behind the face plate, each back plate having an array of light passages, some of which are elongated slots, and said light passages being arranged to coact with face plate openings to form numerals. Some of the face plate openings are arranged in upright line formation, and the slots are inclined at a relatively small acute angle with respect to said upright lines. Each back plate is slideable in a direction defined by the direction of the inclined slots, and is moved back and forth in intermittent steps along its path of move- ment to cause the numerals to change in accordance with the time of day.

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