Digital meter with uniform illumination and less inadvertent set

Details Digital meter with uniform illumination and less inadvertent set Digital meter with uniform illumination and less inadvertent set

1982-02-22

1984-12-04

Corbin, John K.

Horology: time measuring systems or devices

Cases

Adaptable

368 20, 368185, 362 31, F21L 704, G02B 113, G04B 900

Patent

active

044860773

ABSTRACT:
A multiple function, multiple digit meter includes a light directing structure (18) for providing uniform illumination to digits (14) of display (12). A block (20) of clear plexiglass has a surface (22) facing the display (12). Edges (24, 26) of the block (20) have notches (27, 28) for receiving incandescent bulbs (30) to direct light into the block (20). The block (20) has a back surface (32) which curves upward moving away from the bulbs (30) toward the center (34) of the block (20). Surface (32) is reflective to direct light toward the display (12). The configuration of the surface (32) causes an increasing percentage of light received at the surface (32) from the lamps (30) to be reflected toward the display (12), with increasing distance from each lamp (30). The panel meter (40) has a first manually actuated means (70) for selecting one of the multiple functions of the meter (40) and a second manually actuated means (72) for changing a displayed value of a selected function. Simultaneous actuation of the first and second manually actuated means (70 and 72) selects a first one of the digits (14) for setting. Actuation of the second manually actuated means (72) then sets the first one of the digits (14). Actuation of the first manually actuated means (70) then selects a second one of the digits (14) for setting by actuation of the second manually actuated means (72) and so forth.

REFERENCES:
patent: 2430862 (1947-11-01), Carscallen et al.
patent: 3653138 (1972-04-01), Cooper
patent: 3752974 (1973-08-01), Baker et al.
patent: 4112669 (1983-09-01), Kaneko
patent: 4212048 (1980-07-01), Castleberry

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