Electromechanical character display

Details Electromechanical character display Electromechanical character display

1979-07-16

1981-02-24

Jackmon, Edith S.

Horology: time measuring systems or devices

Chronological

With auxiliary illumination for display

368 77, 368227, 368233, 340380, 340757, G04B 1930

Patent

active

042531713

ABSTRACT:
The segments of several 7-segment character displays are defined by elongated light distributors in the form of slots or a series of holes which are in a panel. A large area light source is located on the rear side of the panel. Rotatable opaque disks are interposed between the light source and characters. Each disk has an array of holes for transmitting light to predetermined ones of light pipes which lead to slot segments in one embodiment and which lead to the holes that define segments in another embodiment. When a disk is rotated, different groups of holes in the disks become aligned consecutively with the light pipes where they are used or with the panel holes to thereby illuminate selected character segments so they define a sequence of characters such as the numbers zero to nine. In a digital clock application, a synchronous motor drives a first disk in angular steps to define minutes at their rate of occurrence. The first disk drives a second disk and the second disk drives a third for defining tens of minutes and hours, respectively.

REFERENCES:
patent: 2579166 (1951-12-01), Youhouse
patent: 3566602 (1971-03-01), Bergey et al.
patent: 3673787 (1972-07-01), Kovacevic
patent: 3889196 (1975-06-01), Gibson et al.
patent: 3918052 (1975-11-01), Bricher

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