Enegry-saving keyboard

Coded data generation or conversion – Bodily actuated code generator – Including keyboard or keypad

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

341 26, 395750, 364707, H03K 1794

Patent

active

055857922

ABSTRACT:
An improved energy-saving keyboard with low parts count accomplishes a sophisticated regime of low-power mode intervals in response to key closures and communications from the computer to which the keyboard is connected. An interrupt pin of the keyboard controller (encoder) prompts the transition from low-power mode to normal mode. The communications from the computer is synchronous communications mediated by a clock line, and the interrupt pin is tied not to the clock line but to the data line of the synchronous channel. The interrupt pin is also tied to a resistor array providing pullup biases to the keyboard matrix; in normal-power mode a discrete output of the encoder forces the common point of the resistor array to a fixed voltage level. In low-power mode, on the other hand, the discrete output is not asserted, and the resistor array is pulled high by a pullup impedance of relatively high resistance to the fixed voltage level. In this way, any key closure at the keyboard triggers the interrupt. LEDs, if lit, are gradually dimmed in the absence of key activity, to conserve electrical power.

REFERENCES:
patent: 4649373 (1987-03-01), Bland et al.
patent: 4980836 (1990-12-01), Carter et al.
patent: 4995110 (1991-02-01), McGarry
patent: 5083266 (1992-01-01), Watanabe
patent: 5201059 (1993-04-01), Nguyen
patent: 5237692 (1993-08-01), Raasch et al.
patent: 5280283 (1994-01-01), Raasch et al.
patent: 5283906 (1994-02-01), Chen
patent: 5384721 (1995-01-01), Joto

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Enegry-saving keyboard does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Enegry-saving keyboard, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Enegry-saving keyboard will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1994583

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.