Hood structure for electronic calculators

Details Hood structure for electronic calculators Hood structure for electronic calculators

1973-07-17

1976-10-12

Botz, Eugene G.

Registers

Transfer mechanism

Traveling pawl

312223, 350160LC, G06F 1530, G02F 128

Patent

active

039860140

ABSTRACT:
Electronic calculators generally employ discharge type indication tubes, fluorescence type indication tubes, plasma tubes, light-emitting diodes, liquid-crystal units, etc., as read-out devices therefor. In particular, the liquid crystal indication units are different from the other type units in that they can not emit light themselves and need impingement of light beams thereon. A window or transparent portion is provided at a portion of a hood plate movably affixed on the calculator in order that ambient light beams and more specifically light beams at the rear of the calculator are caused to be incident on the liquid-crystal indication units therethrough. With such arrangement contrast of indication patterns may be emphasized.

REFERENCES:
patent: 2763855 (1956-09-01), Wilfert
patent: 3257507 (1966-06-01), Borberg et al.
patent: 3499112 (1970-03-01), Heilmeier et al.
patent: 3613351 (1971-10-01), Walton
patent: 3647285 (1972-03-01), Harvey et al.
patent: 3781865 (1973-12-01), Yamazaki
patent: 3881807 (1975-05-01), Hosokawa et al.
patent: D226921 (1973-05-01), Cone et al.
Microelectronic Calculator; Ragen Product Data; Ragen Precision Industries, Inc. - May 1972.
Johnson; Appliance - Apr. 1972, pp. 41-44.
Electronic World; "Reflective Liquid Crystal Displays", Nov. 1968; Pinsky, Al; pp. 29, 58.

Affiliated with

Also associated with

Rating

Hood structure for electronic calculators does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Hood structure for electronic calculators, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hood structure for electronic calculators will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-944600