JPH0220780A - Key detecting device - Google Patents

Abstract

PURPOSE:To obtain many key codes and improve the reliability without being influenced by the using circumstances by providing a key holding part with a light receiving part, a light emitting part and a coding means, as well as a lock main body with a light emitting means, a light receiving means and a code discriminating means respectively. CONSTITUTION:Photoelectric transfer components 11, 12 facing the light emitting end 13a and the light receiving end 14a of the light conducting members 13, 14 buried in an outer casing 4 respectively and a pulse code modulation circuit 9 connected to these photoelectric transfer components 11, 12 are provided in a key holding part 8. When a key 5 is inserted into a key hole 6, the fixed pulse light is injected from the light emitting end 13a by means of the emission circuit 19 of a lock main body, and the pulse light becomes coded electric signals by means of the pulse code modulation circuit 9. These electric signals are converted into light signals and injected into the light receiving end 14a from the photoelectric transfer component 12. These output signals are further compared to the set code signals in a code discriminating circuit 22 through a light receiving circuit 20, and the coincidence of the signals results in unlocking.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a key detection device used, for example, in a door cylinder lock of a vehicle.

(Prior Art) Conventionally, this type of key detection device is known, for example, as described in Japanese Patent Application Laid-Open No. 62-202177 by the applicant of the present application.

According to this, in order to prevent unauthorized unlocking operations such as destruction of the cylinder lock, the key is equipped with a code that utilizes the magnetic change of a magnetic material, and the code is activated when the key is inserted into the keyhole. Configured to find a match.

(Problem to be Solved by the Invention) However, according to the configuration of the prior art, since the key itself is provided with a code made of a magnetic material, it is not possible to have many types of codes, and it is not possible to use magnetic changes. Therefore, there is a problem in that it is easily affected by the environment in which it is used.

The present invention was made in order to solve such conventional problems, and it is possible to obtain a large number of key codes, improve the reliability of key detection without being affected by the usage environment, and improve handling operations. It is an object of the present invention to provide a key detection device that can be used in the same way as a normal key.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a light emitting means for emitting a predetermined pulsed light when a key is inserted into a keyhole on the lock body side, and a light receiving section that receives the pulsed light. and encoding means for converting the pulsed light received by the light receiving section into a code signal;
11j
A light-emitting section for converting the electrical signal converted into a code signal into an optical signal and emitting the same is provided in the key grip part of the key, a light-receiving means for receiving the optical signal, and an output signal of the light-receiving means. The present invention is characterized in that code discriminating means for comparing the set code signal with the lock body is provided on the lock body side.

(Function) When the key body is inserted into the key hole, a predetermined pulsed light is emitted from the light emitting means on the lock body side, and the pulsed light becomes an electrical signal coded by the encoding means of the key gripping part. The light is converted into an optical signal and enters the light receiving means on the lock body side from the light emitting part of the key gripping part. The output signal from the light receiving means and the setting code signal are compared by the code determining means, and it is determined whether the codes match or do not match.

(Embodiment) Fig. 1 shows a first embodiment in which the present invention is applied to an automobile door cylinder lock. It is roughly composed of an inner cylinder 3 that is rotatable around an axis, and an outer cylinder 1ii4 that is fixed to the door 1 and coaxial with the inner cylinder 3.On the other hand, the key 5 is inserted into a key hole formed in the inner cylinder 3. The key body 7 is generally composed of a key body 7 to be pressed into the key body 6, and a key grip part 8 attached to the key body 7.Here, the key grip part 8 includes a pulse code modulation circuit as a coding means 9 is provided together with the battery 10, and the pulse code modulation circuit 9
is connected to a photoelectric conversion element 11 as a light receiving part and a light emitting element 12 as a light emitting part, and the pixel elements 11 and I2 are exposed to the outside of the key 5. In addition, n(j light distribution electric conversion element 11
faces the light emitting end 13a of the light guide member 13 embedded in the outer cylinder 4, and the light emitting element Tl2 faces the light guide member 14 embedded in the outer cylinder 4.
It faces the light-receiving end 14a of.

In addition, the inner cylinder 3 and the outer cylinder 4 are respectively formed with insertion holes 3a and 4a that communicate with each other at the locked position, and both insertion holes 3a and 4a are formed in the inner cylinder 3 and the outer cylinder 4, respectively.
A plunger 15a of a solenoid 15 mounted on the outer cylinder 4 is pushed through.

Note that an unlocking mechanism (
A lock plate cam 16 is attached, and the lock plate cam 16 can realize the unlocking state of the unlocking mechanism by rotating the inner cylinder 3 using the key 5.

On the other hand, a key insertion switch 17 is provided at the rear of the inner cylinder 3 and is turned on when the key body 7 is inserted into the key hole 〇.
8, a predetermined clock pulse Pc is generated by the operation of the glock pulse generating circuit 18, and the clock pulse is supplied to a light emitting circuit 19 as a light emitting means and converted into predetermined pulse lights t and p. The pulsed light Lp is emitted from the output light end +3a.

The coded electrical signal Sc from the pulse code modulation circuit 9 is converted into an optical signal r4s by the light emitting element 12,
The optical signal Ls is supplied to a light-receiving circuit 20 as a light-receiving means via the light guide portion 14 and photoelectrically converted. Incidentally, the light receiving circuit 20 is supplied with a tarok pulse Pc from the 1111th clock pulse generation circuit 18 for synchronizing with the n1jth light emitting circuit 19. Further, the output signal Sm of the light receiving circuit 2o is inputted to the code discrimination circuit 22 together with the setting code signal sb stored in the code setting circuit 2I, and the code discrimination circuit 22 receives the setting code signal sb.
It is determined whether or not b matches the output signal Sm of the light receiving circuit 20. The actuation signal Sd, which is the output of the code discrimination circuit 22, is supplied to the solenoid drive circuit 23, and the solenoid 15 of 1);j is driven according to the discrimination result of the code discrimination circuit 22.

Next, the operation of the first embodiment configured as described above will be explained with reference to FIG. 2.

When the door cylinder lock 2 is in the locked state, the plunger 15a of the solenoid 15 is inserted into the insertion holes 3a and 4a, and the rotation of the inner cylinder 3 within the outer cylinder 4 is caused by the rotation between the inner cylinder 3 and the outer cylinder 4. This is prevented along with the action of a plurality of plate tumblers (not shown) provided.

In the locked state of the unlocking mechanism, when the key body 7 of the regular key 5 is pushed into the key 66, the plate tumbler protruding toward the outer cylinder 4 side is completely drawn into the inner cylinder 3, and
When the key insertion switch 17 is completely pressed, the key insertion switch 17 is turned on, and the clock pulse generation circuit 18 generates a clock pulse Pc of a predetermined period as shown in FIG. 2(a).

As a result, the pulsed light Lp is emitted from the light output end +3a of the light guide member 13 in response to the output of the light emitting circuit 19, and the pulsed lights t and p enter the photoelectric conversion element ll. The electrical signal photoelectrically converted by the photoelectric conversion element 11 is converted into a predetermined code signal Sc by the pulse code modulation circuit 9 as shown in FIG. 2(b).
Of the code signal Sc, the one for a predetermined period Ts after generation is used for the reset period of the code discrimination circuit 22, etc., and the code signal Sc after the elapse of the predetermined period Ts is recorded in n:1. It is used for comparison with the setting code signal sb.

For example, if the period '1'l having the same period as the clock pulse Pc is rlJ, and the period To having twice the period of the clock pulse Pc is "0", the code shown in FIG. 2(b) is 0.1, 0...''.

The code signal Sc from the pulse code modulation circuit 9 is converted into an optical signal Ls by the light emitting element 12, and the optical signal Ls is supplied from the light receiving end 14a of the light guide member 14 to the light receiving circuit 20. The output signal Sm from the light receiving circuit 20 is the setting code signal 5b(r
The code discrimination circuit 22 compares the signal containing the code "Oll, 0...", but since the codes of both signals match, the code discrimination circuit 22 outputs a predetermined activation signal Sd. It is output and drives the solenoid drive circuit 23.

When the solenoid drive circuit 23 is driven, the solenoid 1
5 plungers! 5a is moved back, and the inner cylinder 3 can now rotate within the outer cylinder 4. That is, such a plunger 15
When the key 5 is rotated in the normal operation in the backward state of a, the inner cylinder 3 rotates, the lock plate cam 16 swings, the unlocking mechanism becomes the unlocked state, and the door 1 is unlocked. It can be done.

01j When the output signal Sm from the light receiving circuit 20 and the setting code signal sb from the code setting circuit 21 do not match, for example, a picking operation using a metal fitting or the like, or the pulse code modulation circuit 9 is not buried in the ghee gripping part. Even if the tumbler is pulled into the inner cylinder 3 by pushing the dummy key into the key hole, etc., the electric signal containing the predetermined code is not input to the light receiving circuit 20, so the predetermined activation signal Sd cannot be obtained from the code discrimination circuit 22. , the solenoid drive circuit 23 is not driven and the inner cylinder 3 cannot rotate.

Next, FIG. 3 shows a second embodiment of the present invention,
In place of the solenoid 15 and solenoid drive circuit 23 in the first embodiment, an anti-theft system operating means 24 for the automobile is provided.

The anti-theft system actuating means 24 is configured to issue an alarm such as intermittent sounding of the horn or flashing of the headlights when the unlocking operation is performed without obtaining a predetermined actuation signal Sd from the code discrimination circuit 22, for example. It includes various anti-theft systems such as an alarm circuit 25 that is activated, a starter cut circuit 26 that prevents the starter motor from being driven, or a fuel cut circuit 27 that cuts off the fuel supply system. Therefore, the code discriminating circuit 2
The operation is stopped when a predetermined operation signal Sd from 2 is obtained.

The operation of the second embodiment is performed as follows, for example. Note that the same reference numerals are used for the same constituent members as in the first embodiment, and redundant explanation will be omitted.

(1) Anti-theft system set door cylinder lock 2 is attached to the driver side door and key 5
For example, when the assist side door is locked, the door can be locked and unlocked using the lock knob connected to the unlocking mechanism described in n11.
The driver side door is locked with a keyless lock (locking the driver side door without using the key 5, that is, the driver side door is opened, the lock knob of the driver side door is pushed in, and the door handle connected to the lock knob of the driver side door is pulled. When the driver side door is closed and locked), the anti-theft system is set.

The reason why we decided to set the anti-theft system at the time of keyless locking was because the system was set by the user.
This is to make the process #i-like.

(2) Setting I ~ Release and unlocking using the regular key 5 When the key body 7 is inserted into the key hole 6 in this locked state, the code discrimination circuit 22 outputs the predetermined activation signal S cl as described above. and the operation of the anti-theft system activation means 24 is prohibited.

In other words, no alarm is issued, the starter motor can be driven, or the fuel supply system can operate normally, and the set is released. Of course, if you turn the inner Y63 with this key pressed in, you can unlock the tel! The system can be unlocked, that is, the driver's side door can be unlocked.

(3) In the case of unauthorized operation" In the locked state described in 1., for example, the dummy key is inserted into the key hole 6, or a false optical signal is input to the light receiving end 14a of the light guide member 14. However, the code discrimination circuit 22 does not output the activation signal Sd, and if an unlocking operation is performed at that time, the anti-theft system activation means 24 is activated. That is, an alarm is issued, the starter motor cannot be driven, or the fuel supply system does not operate normally.

(4) Stopping the operation of the anti-theft system activation means 24 To stop the operation of the anti-theft system activation means 24, push the regular key 5 into the key hole 6 and obtain the activation signal Sd from the code discrimination circuit 22. If so, the operation of the anti-theft system activation means 24 is stopped.

Therefore, unlike the first embodiment, the second embodiment differs from the first embodiment in that l
Rather than preventing unauthorized unlocking of the door cylinder lock 2, the purpose is to systematically prevent the vehicle from being stolen and taken away.

In the above embodiments, the present invention is applied to an automobile door, but it is also useful when applied to, for example, a safe.

(Effects of the Invention) According to the present invention, a light emitting means for emitting a predetermined pulsed light when a key is inserted into a keyhole is provided on the lock body side,
a light receiving unit that receives the ojj pulsed light, and a coding unit that converts the pulsed light received by the light receiving unit into a code signal;
a light-emitting part that is exposed together with the light-receiving part and that converts the electrical signal converted into a code signal into an optical signal and emits the light-emitting part, is provided in the key grip part of the key, and a light-receiving part that receives the n:i light distribution signal; and code discrimination means for comparing the output signal of the light receiving means and the setting code signal are provided on the main body side of the lock. While convenient, optical signals
Many types of codes can be obtained by exchanging electrical signals, etc., and at least they are less affected by the usage environment than those that use magnetic changes.Furthermore, the key side and the lock body side are organically strong in key detection. Since there is interdependence, the reliability of key detection can be improved. (In terms of power and electricity, there is no need to provide synchronization means on the key side and the lock body side, respectively.
The circuit configuration can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a first embodiment of the present invention, FIG. 2 is a timing chart for explaining the operation of the embodiment, and FIG. 3 is a block diagram showing a second embodiment of the present invention. . 4... Outer cylinder (lock body), 5... Key, 6... Key hole, 8... Key grip part, 9... Pulse code modulation circuit (encoding means), 11... Photoelectric Conversion element (light receiving section)
, 12... Light emitting element (light emitting unit), 19... Light emitting circuit (light emitting means), 20... Light receiving circuit (light receiving means), 22
...Code discrimination circuit, Lp...Pulse light, Sc...
・Encoded electrical signal, Ls...optical signal, S+n
... Output signal, S +) ... Setting code signal.

Claims (1)

[Claims] 1. A light emitting means that emits a predetermined pulsed light when the key is inserted into the keyhole is provided on the lock body side, a light receiving section that receives the pulsed light, and a coding that converts the pulsed light received by the light receiving section into a code signal. and a light-emitting part that is exposed together with the light-receiving part and converts the electrical signal converted into a code signal into an optical signal and emits the light-emitting part, which is provided in the key grip part of the key, and the light-receiving part receives the optical signal. A key detection device characterized in that the lock main body side is provided with a code determining means for comparing an output signal of the light receiving means and a setting code signal.