United States Patent [191
[11] Patent Number:
Karasawa et al.
[45]
[54] ELECTRONIC KEY APPARATUS
Date of Patent:
[56]
[75] Inventors: Katsuaki Karasawa; Hideyuki Shoji;
Tokyo, Japan
Casio Computer Co. LTD., Tokyo,
Japan
[21] Appl. No.: 910,649
[22] Filed:
Sep. 23, 1986
[30]
Foreign Application Priority Data
Sep. 30, 1985 [JP]
Oct. 16, 1985 [JP]
Japan .............................. .. 60.217344
Japan .............................. .. 60-232057
Oct. 16, 1985 [JP]
Oct. 22, 1985 [JP]
Japan
Japan
Oct. 31, 1985 [JP]
Japan .............................. .. 66246012
60-232058
60-235624
Nov. 22, 1988
References Cited
U.S. PATENT DOCUMENTS
Tomoo Kasuo; Kazunori Kita;
Syunichi Matsumoto; Keisuke
Tonomura; Narutoshi Minami, all of
[73] Assignee:
4,786,900
3,891,980
6/1975
4,189,712
2/1980
4,353,064 10/1982
Lewis et al. ............. .. 340/825.3l X
Lemelson
......
. . . . . . . . ..
235/382 X
Stamm .......................... .. 235/382 X
4,573,046 2/1986 Pinnow.
Primary Examiner-Ulysses Weldon
Attorney, Agent, or Firm-Frishauf, Holtz, Goodman &
Woodward
[57]
ABSTRACT
An electronic key apparatus wherein an encrypted code
for unlocking an electronic lock is stored in an en
crypted code storage register. A password is stored in a
password storage register. The same password as that
stored in the password storage register, is input via a
switch. The password input by the switch is compared
with the password stored in the password storage regis
[51]
Int. Cl.4 ............................................. .. H04Q 1/00
ter, by a coincidence detection circuit. When a coinci
[52]
US. Cl. ........................ .. 340/825.31; 340/825.19;
dence is detected, the encrypted code stored in the
encrypted code storage register is transmitted to the
electronic lock, by a transmitter.
340/ 825.72
[58]
Field of Search ................ .. 70/278, 256; 361/172;
235/382, 382.5; 307/10 AT; 340/8253, 825.31,
825.32, 825.34, 825.69, 825.72
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