Vehicle key device
First Claim
Patent Images
1. A vehicle lock having a keyhole for inserting a key comprising:
- a key;
a wound coil surrounding the keyhole for magnetically coupling the key in response to the inserting of the key in the keyhole;
signal generating means for applying a data detecting signal to the wound coil;
circuit means mounted on the key disposed to magnetically couple the wound coil for generating first predetermined data in the data detecting signal, said first predetermined data being distinctive to the key;
signal detecting means for detecting the generated first predetermined data;
means for storing second predetermined data; and
control means responsive to the first predetermined data and the second predetermined data for selectively generating a permission signal.
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Abstract
In a vehicle key device, when a key is inserted into a lock, the former is magnetically coupled to the latter so that data are transmitted therebetween, and only when the data provided by the lock and key correspond with each other is the driving of the engine permitted. This device positively prevents the driving of a vehicle by an unauthorized person.
41 Citations
10 Claims
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1. A vehicle lock having a keyhole for inserting a key comprising:
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a key; a wound coil surrounding the keyhole for magnetically coupling the key in response to the inserting of the key in the keyhole; signal generating means for applying a data detecting signal to the wound coil; circuit means mounted on the key disposed to magnetically couple the wound coil for generating first predetermined data in the data detecting signal, said first predetermined data being distinctive to the key; signal detecting means for detecting the generated first predetermined data; means for storing second predetermined data; and control means responsive to the first predetermined data and the second predetermined data for selectively generating a permission signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A vehicle key device comprising:
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an annular core disposed around the key inserting hole of a vehicle lock; a rotor coil wound on said annular core; signal generating means for supplying a data detecting signal to said rotor coil; signal detecting means operative to provide an output signal in response to detection of a signal transmitted through said rotor coil; means storing deciding data; control means for comparing data provided by the output signal of said signal detecting means with the deciding data, and applying an engine drive permission signal to an engine drive section at times when said data coincide with each other in content; and a key insertable into said key inserting hole of said lock, said key including; a bar-shaped core which, when said key is inserted into said key inserting hole, engages with said annular core at two points, to form a magnetic circuit; a key coil wound on said bar-shaped core, said key coil being magnetically coupled to said rotor coil when said key is inserted into said key inserting hole; and data generating means including the key coil for causing said key coil to provide a signal to said signal generating means including predetermined data in response to a signal induced in said key coil.
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Specification