US 12,216,872 B2
Capacitive touch keypad
Jenna Lopez, Indianapolis, IN (US); Maxwell Watson, Lakewood, CO (US); Sukanya Ranganathan, Breslau (CA); and Frank A. Nardelli, Indianapolis, IN (US)
Assigned to Schlage Lock Company LLC, Carmel, IN (US)
Filed by Schlage Lock Company LLC, Carmel, IN (US)
Filed on Jan. 30, 2024, as Appl. No. 18/427,218.
Application 18/427,218 is a continuation of application No. 17/566,837, filed on Dec. 31, 2021, granted, now 11,886,676.
Prior Publication US 2024/0338102 A1, Oct. 10, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G06F 3/044 (2006.01); G06F 3/047 (2006.01); H03K 17/96 (2006.01)
CPC G06F 3/0446 (2019.05) [G06F 3/047 (2013.01); H03K 17/962 (2013.01); H03K 2217/960755 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An access control device, comprising:
a capacitive touch keypad assembly comprising:
a controller;
a plurality of touch-sensitive key locations arranged in a plurality of columns and a plurality of rows;
a plurality of first lines connecting the plurality of rows with the controller; and
a plurality of second lines connecting the plurality of columns with the controller, wherein at least two touch-sensitive key locations in each of the plurality of columns are connected to the controller with a first branch of one the plurality of second lines that is connected between a junction and a first one of the at least two touch-sensitive key locations, a second branch of the one the plurality of second lines that is connected between the junction and a second one of the at least two touch-sensitive key locations, and a third branch connected between the junction and the controller; and
wherein the first branch, the third branch, and a first one of the plurality of first lines connected to the first one of the at least two touch-sensitive key locations form a first loop that is in electrical parallel with a second loop formed by the second branch, the third branch, and a second one of the plurality of first lines connected to the second one of the at least two touch-sensitive key locations.