Passive animated, or pattern changing sign

Details Passive animated, or pattern changing sign Passive animated, or pattern changing sign

1982-03-19

1983-12-13

Arnold, Bruce Y.

40454, 40559, 40582, G02B 2700, G03B 2502, G09F 1302, G09F 1316

Patent

active

044202210

ABSTRACT:
A lenticular device is disclosed having a lens array with one or more lenticular convex ridges joined by cusped or concave valleys forming lens elements on one of its surfaces. In addition, the lenticular array is uniformly separated from a message transmitting surface by an air space directly related to a field of view of no more than 30.degree. determined by the converging light rays at the focal point. The carrier sheet or message is a plurality of messages resolved from a series of linear segments in the form of binary lineations placed in focus relative to the lens array. By establishing a proportional relationship between lens aperture and focal length, the rate of message change is predetermined for any prescribed viewing situation. Surface interference caused by reflection, chromatic diffraction, and other light loss is controlled by the relationship of optical design, and optical quality, coupled with other structural elements.

REFERENCES:
patent: 1475430 (1923-12-01), Curwen
patent: 4034555 (1977-07-01), Rosenthal

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