JPH0640247U - Electromagnetic induction type lock device - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the electromagnetic conversion efficiency of the electromagnetic induction locking device. An electromagnetic induction steering lock device according to the present invention includes an oscillation circuit 22 that can be mechanically unlocked and that oscillates at different frequencies to generate an electromagnetic field. When the oscillation circuit 22 oscillates at a specific frequency, The key 31 having the resonant circuit 14 that resonates is combined. A bracket 19 is attached to the frame 11 of the steering lock device 10.
And the coil antenna 23 having the central axis 35 directed to the resonance circuit 14 attached to the key 31 is attached to the bracket 19. Steering lock device 10
Since the coil antenna 23 fixed to is facing the resonance circuit 14 of the key 31, electromagnetic conversion can be efficiently performed between the steering lock device 10 and the coil antenna 16 of the key 31.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a locking device, and more particularly to an electromagnetic induction locking device that combines a mechanical locking device and an electronic locking device that utilizes a remote control signal.

[0002]

[Prior art]

 For example, as disclosed in Japanese Examined Patent Publication No. 4-15141, a vehicle key device in which a key coil provided on a key and a rotor coil provided on a lock are magnetically coupled is known. This key device includes an annular core arranged around a key insertion hole of a vehicle lock. A rotor coil is wound around the annular core, and an information detecting signal is supplied to the rotor coil by the signal generating means. The signal transmitted to the rotor coil is detected by the signal detecting means. The control means fetches the output signal of the signal detection means, compares the information based on this output signal with the determination information, and outputs the engine drive permission signal to the engine drive section only when the contents of both match. The key that can be inserted into the key insertion hole of the lock has a shaft core that is close to the annular core at two locations to form a magnetic circuit when the key is inserted, and a rotor coil and a magnet that are wound around the shaft core when the key is inserted. It has a key coil to be coupled and an information generating means for generating a signal containing specific information from the key coil in response to the signal induced in the key coil.

When the key is inserted into the key insertion hole of the lock and the axial core is brought close to the annular core to form a set of magnetic circuits, the signal from the signal generating means is transmitted to the key coil via the rotor coil. Induced. When the information generating means responds to this signal, a signal containing specific information is generated from the key coil. When this signal is induced in the rotor coil, this signal is detected by the signal detection means and supplied to the control means. The control means compares the information based on the output signal of the signal detection means with the determination information, and outputs the engine drive permission signal to the engine drive section only when the contents of the two match.

In this vehicle key device, information for driving the engine is exchanged by magnetically coupling the lock-side annular core and the key-side shaft-shaped core, and the information from the key side is transferred to the lock-side. Since the engine can be driven only when the information matches the information, the circular core and the axial core do not have to detect the information due to the adhesion of dust or read the wrong information by operating the keys. The engine can be reliably driven by magnetic coupling with.

[0005]

[Problems to be solved by the device]

 By the way, the vehicle key device disclosed in the above publication forms a magnetic circuit by bringing the lock-side core and the key-side core into contact with each other, so that there is an advantage that electromagnetic conversion is efficiently performed over the entire changing frequency range. is there. However, since the core is used on both the lock side and the key side, there are drawbacks that the device becomes large and the number of parts increases. In addition, since the cores must be brought close to each other to form the magnetic circuit, there is a space limitation when arranging the parts around the key and the keyhole, which complicates the process.

Therefore, an object of the present invention is to provide an electromagnetic induction type locking device which does not use a core and has excellent electromagnetic conversion efficiency.

[0007]

[Means for Solving the Problems]

 The electromagnetic induction locking device according to the present invention is provided with an oscillation circuit that can be mechanically unlocked and that oscillates at different frequencies to generate an electromagnetic field, and a resonance circuit that resonates when the oscillation circuit oscillates at a specific frequency The key provided is combined. In this electromagnetic induction lock device, a bracket is attached to the frame of the lock device, and a coil antenna having a central axis toward the resonance circuit attached to the key is attached to the bracket.

[0008]

[Action]

 Since the coil antenna fixed to the lock device faces the resonance circuit of the key, electromagnetic conversion can be efficiently performed between the lock device and the coil antenna of the key.

[0009]

【Example】

 An embodiment of a steering lock device according to the present invention applied to a steering lock device for an automobile will be described below with reference to FIGS. 1 and 2.

As shown in FIG. 1, a steering lock device 10 according to the present invention includes a frame 11 and a key cylinder 17 rotatably arranged in a frame 11 for mechanically unlocking the steering lock device 10. , And a bracket 19 attached to the frame 11 with screws 18. The coil antenna 23 of FIG. 3 is arranged in the annular portion 19a of the bracket 19.

The key 31 shown in FIG. 1 includes a key blade 32 inserted into the key cylinder 17, and a key head 33 made of resin. A substrate 34 is arranged on the key head 33, and a resonance circuit 14 which is composed of a capacitor 15 and a coil antenna 16 and resonates at a specific frequency is arranged on the substrate 34. The coil antenna 23 attached to the annular portion 19a of the bracket 19 has a central axis 35 directed to the resonance circuit 14 attached to the key 31.

FIG. 3 is a block diagram showing an electric circuit of the steering lock device of the present invention. A lock control circuit 20 is provided in the lock device 10, and terminals of the lock control circuit 20 are connected to a transmission / reception circuit 12 and an actuator 21 such as a relay for driving a starter motor of an automobile. The transmission / reception circuit 12 has an oscillation circuit 22 including a coil antenna 23, and the oscillation circuit 22 is controlled by the output of the lock control circuit 20. Further, the transmission / reception circuit 12 has an amplifier filter circuit 25 for amplifying and filtering the output of the oscillator circuit 22, a detection circuit 26 for detecting the output of the amplifier filter circuit 25, and an output signal of the detection circuit 26 within a predetermined frequency. It is provided with a comparison circuit 27 which detects whether or not it is present and gives a detection signal to the lock control circuit 20 when the output of the detection circuit 26 is within a predetermined frequency range.

In the above structure, when the key 12 is inserted into the steering lock device 10 and rotated, the steering lock device 10 is mechanically unlocked. Further, when the key 31 is rotated to the start position, a control signal is given from the lock control circuit 20 to the oscillation circuit 22, and the oscillation circuit 22 continuously generates outputs of different frequencies. At this time, when the resonance circuit 14 resonates at a specific frequency, the resonance circuit 14 resonates when the oscillation circuit 22 generates a signal of a specific frequency. The resonance circuit 14 is connected to the oscillation circuit 22 by electromagnetic induction at the time of resonance and absorbs energy. The output of the oscillation circuit 22 is given to the detection circuit 26 through the amplifier filter circuit 25, and the output of the detection circuit 26 rises or falls above a certain level. The output of the detection circuit 26 is sent to the comparison circuit 27. The comparison circuit 27 compares the output of the detection circuit 26 with a constant level and locks the binarized signal that can be detected by the lock control circuit 20. Give to 20. As a result, the lock control circuit 20 determines whether unlocking is permitted or not depending on whether this signal is given when a specific frequency is output, and gives an unlocking signal to the actuator 21 of the lock device, The actuator 21 is operated. For example, the actuator 21 is a relay that energizes the starter motor.

As described above, the steering lock device 10 can be electrically unlocked via the remote operation signal by the electromagnetic inductive coupling between the resonance circuit 14 and the oscillation circuit 22 of the steering lock device 10. Since the central axis line 35 of the coil antenna 23 fixed to the steering lock device 10 faces the resonance circuit 14 of the key 31, electromagnetic conversion can be efficiently performed between the coil antenna 23 of the steering lock device 10 and the coil antenna 16 of the key 31. It can be carried out.

The embodiment of the present invention is not limited to the above-mentioned embodiment, but can be modified. For example, in the above-mentioned embodiment, an example in which the invention is applied to a steering lock device attached to an automobile is shown, but it is obvious that the invention can be applied to a locking device other than the steering lock device or an electromagnetic induction locking device.

[0016]

EFFECTS OF THE INVENTION Since the invention can efficiently perform electromagnetic conversion through the coil antenna, it has advantages that power consumption can be reduced and the lock device can be operated reliably.

[Brief description of drawings]

FIG. 1 is a sectional view of an electromagnetic induction lock device according to the present invention applied to a steering lock device.

2 is a front view of FIG.

FIG. 3 is a block diagram showing an electric circuit used in the electromagnetic induction type steering lock device of the present invention.

[Explanation of symbols]

10 ,. ． Steering lock device, 11. ． Frame, 12. ． Transmitter / receiver circuit, 14. ． Resonant circuit, 15. ．
Capacitors, 16, 23. ． Coil antenna, 17. ．
Key cylinder, 19. ． Bracket, 20. ． Lock control circuit, 21. ． Actuator, 22. ． Oscillator circuit,
23. ． Coil antenna, 31. ． Key, 35. ． Central axis

Claims (1)

[Scope of utility model registration request] 1. A key provided with an oscillation circuit that can be mechanically unlocked and that oscillates at different frequencies to generate an electromagnetic field, and that has a resonance circuit that resonates when the oscillation circuit oscillates at a specific frequency. In the combined electromagnetic induction lock device, the bracket is attached to the frame of the lock device, and the coil antenna having the central axis line toward the resonance circuit attached to the key is attached to the bracket.