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1. 发明公开

EP0162132A3 Keyless access control and security system 失效
标题翻译：无钥匙访问控制和安全系统
公开(公告)号：EP0162132A3
公开(公告)日：1987-10-07
申请号：EP84114001
申请日：1984-11-20
申请人： ESSEX-TEC CORPORATION
发明人： Burgess, James P. , Kaufman, Peter
IPC分类号： B60R25/10
CPC分类号： G07C9/0069 , B60R25/1001 , B60R25/1003
摘要： @ A keyless access control and security system especially adapted for use with an automobile comprises a piezoelectric permutation touchpad unit which can be affixed, without requiring bodywork, to the outside of the vehicle's door in the key cylinder aperture. The touchpad is illuminated when touched and is therefore usable in the dark. The person seeking access must enter the correct access code combination on the touchpad to open the door andforthe trunk. The touchpad is connected to a remotely located logic circuit which controls access. The circuit provides for a signal of low intensity, indicating that a correction in the code entered into the touchpad should be made and, after a time delay, an alarm of high intensity, if no correction is made. Upon activation of the alarm, the headlights are flashed, the horn is sounded, or both. In order to enable a parking attendant, repairman, or some other authorized person to have access to the automobile without revealing the access code, the logic circuit can be programmed, by operation of the touchpad, using the proper access code and a further secondary code, arbitrarily selected, to provide access to the automobile in response to the secondary code, which later can be erased.

2. 发明公开

EP0139162A1 Coupling circuit between high impedance piezoelectric signal and utilizing circuit 失效
标题翻译：压电信号的高阻抗电路和处理电路之间的耦合电路。
公开(公告)号：EP0139162A1
公开(公告)日：1985-05-02
申请号：EP84110012.6
申请日：1984-08-22
申请人： ESSEX-TEC CORPORATION
发明人： Echols, John C. , Staufenberg, Charles W., Jr.
IPC分类号： H03K17/96 , H03K17/16
CPC分类号： H01L41/042 , H01L41/1132 , Y10S310/80
摘要： The high impedance output of a touch-sensitive piezoelectric sensor (10) is coupled directly to the high impedance input of a CMOS (amplifier (20).. The CMOS amplifier (20) is protected on its input side by clamping circuits (24,25,26,27) which restrict the voltage swing applied to the gates (32,33) to within the range defined by the positive and negative CMOS bias supply (+Vpp and -V ss ). The sensor (10) produces voltages of approximately equal magnitude in response to slow acting temperature changes and quicker acting manual touching. In order to distinguish piezoelectric from pyroelectric signals, the CMOS bias is periodically and briefly shorted, to ensure a brief return-to- zero of the sensor output, thereby effectively suppressing the slow acting pyroelectric signal without interfering with sensing of quick acting piezoelectric signals.

3. 发明公开

EP0162132A2 Keyless access control and security system 失效
标题翻译：无钥匙门禁控制和安全系统。
公开(公告)号：EP0162132A2
公开(公告)日：1985-11-27
申请号：EP84114001.5
申请日：1984-11-20
申请人： ESSEX-TEC CORPORATION
发明人： Burgess, James P. , Kaufman, Peter
IPC分类号： B60R25/10
CPC分类号： G07C9/0069 , B60R25/1001 , B60R25/1003
摘要： @ A keyless access control and security system especially adapted for use with an automobile comprises a piezoelectric permutation touchpad unit which can be affixed, without requiring bodywork, to the outside of the vehicle's door in the key cylinder aperture. The touchpad is illuminated when touched and is therefore usable in the dark. The person seeking access must enter the correct access code combination on the touchpad to open the door andforthe trunk. The touchpad is connected to a remotely located logic circuit which controls access. The circuit provides for a signal of low intensity, indicating that a correction in the code entered into the touchpad should be made and, after a time delay, an alarm of high intensity, if no correction is made. Upon activation of the alarm, the headlights are flashed, the horn is sounded, or both. In order to enable a parking attendant, repairman, or some other authorized person to have access to the automobile without revealing the access code, the logic circuit can be programmed, by operation of the touchpad, using the proper access code and a further secondary code, arbitrarily selected, to provide access to the automobile in response to the secondary code, which later can be erased.

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