JPH087512Y2 - Anti-theft device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an antitheft device that enables normal operation of the device only during an operation confirmation time in a regular inspection and initial inspection of an antitheft device.

[Conventional technology]

In a device with an anti-theft device, a normal operation of the device is enabled only when a code input from an operation key of the device and a code preset and stored in the device are compared and they match.

FIG. 3 is a device block diagram when the anti-theft device according to the prior art is applied to an in-vehicle audio device.

Reference numeral 1 is an electrically erasable and writable nonvolatile memory (for example, EEPROM). A code UCD called a user code is set to the address of the non-volatile memory 1 by a predetermined code setting operation. Reference numeral 2 denotes a microcomputer, a processor 3 for performing data processing, a ROM 4 for storing a control program in advance, and a RAM 5 for storing processing results and the like.
And the like, and controls the radio, tape player, and the like, and executes antitheft control. Reference numeral 6 denotes a main body of a vehicle-mounted tape player with a radio, which includes a PLL circuit 7, a tuner 8 and a cassette mechanical control unit 9.
The PLL circuit 7, the tuner 8, and the radio control function of the microcomputer 2 constitute a synthesizer-type tuner.
Reference numeral 10 denotes an operation unit, which is provided with various keys operated to prevent theft of various keyers for controlling radio and tape players.

FIG. 4 is a flowchart for unlocking the security code of the anti-theft device in the prior art.

In order to enable the normal operation of the device with the anti-theft device, the user must input the personal identification number by operating the keys of the operation unit 10 (step 100). The processor 3 compares the user code UCD set and stored by the user in the non-volatile memory 1 with the personal identification number (101), and if the entered personal identification number matches the user code UCD, the car stereo system shown in FIG. Will operate as a normal radio tape player (step 102).

On the other hand, if the code number corresponding to the user code UCD is not input in step 100, the processor 3 checks whether it is the fourth input (step 103). still,
You can enter the code up to three times in succession.

If it is not the fourth code input, the operation and processing after step 100 are repeated.

However, if the code that matches the user code UCD is not entered even after the third code entry, it is considered that the suspicious person is entering the code and all the subsequent operations are invalidated (step 104).

[Problems to be solved by the device]

However, when operating the device normally during the initial inspection of the device and the periodic inspection after a certain period of time,
Since the equipment cannot be inspected unless the PIN is entered each time, whether the PIN list or card is used during the inspection,
Alternatively, the owner of the device must be contacted and the PIN code must be entered to perform the inspection.

The present invention has been made under such a background, and an object thereof is to enable normal operation of a device for a certain period of time by inputting a specific signal (code) without inputting a device-specific code. .

[Means for solving the problem]

In order to achieve the above object, in the anti-theft device according to the present invention, the normal operation of the device is enabled when the coincidence of the first personal identification code is detected, and the second personal identification entered by the personal identification code inputting means. The code is collated with a second secret code given in advance in the anti-theft device, and when a match of the second secret code is detected, the normal operation of the device is allowed only for a predetermined time. I am trying.

[Action]

When remote-controlling a device with an anti-theft device, a signal (code) suitable for each operation is normally assigned to the device, but a function that enables normal operation of the device by using a signal that is not in use By equipping the anti-theft device in advance, the inspector inputs a specific signal (code) with the remote control device and enables normal operation of the device only for a predetermined time.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the structure of an anti-theft device according to an embodiment of the present invention, and FIG. 2 is a flow chart of a secret code releasing function of the anti-theft device shown in FIG. 1. In FIG. The same reference numerals are given to the parts corresponding to the respective parts, and the description thereof will be omitted. In the on-vehicle radio tape player with an anti-theft device shown in this figure, a remote control transmitter 12 and a remote control receiver 11 for performing remote control operation of the on-vehicle radio tape player are used as the second password input means. ing.

The second password, for example 10011001, transmitted from the remote control transmitter 12 is received by the remote control receiver 11 (step 200). The processor 3 verifies whether the received second personal identification number matches the predetermined second personal identification number stored in the ROM 13 in the microcomputer 2 (step 201).

If they match, the processor 3 stores the processing result and the like according to the control program stored in the ROM 13.
Operate as a normal tape player with radio while using M5 (step 202). When 5 minutes have passed from the start of the operation (step 203), the operation is stopped and all the subsequent operations are invalidated (step 207).

On the other hand, if the second personal identification number input by the remote control transmitter 12 at step 201 does not match the predetermined second personal identification number stored in the ROM 13, the user code UCD stored in the nonvolatile memory 1 It is checked whether or not it matches the (first PIN) (step 204). Normally, it does not match, so it is checked whether it is the fourth input (step 206), and the second PIN is input three times. Since it is possible to re-input continuously, the operation and processing from step 200 onward are repeated unless it is the fourth input of the personal identification number.

However, if the second secret code is entered by the remote control transmitter 12 for the third time and the second secret code does not match, and the first secret code does not match, the suspicious person operates. As it is, it moves to step 207 and cannot accept further operations.

Of course, the user code UCD stored in the non-volatile memory 1 when the first personal identification number is input in step 200
If it matches, it operates as an ordinary tape player with a radio (step 205), and if it does not match, the password input is allowed up to three times continuously (step 206) as in the conventional case. Is.

In the above, a special dedicated code from the remote control transmitter was used as the second PIN, but PLAY, FF, RE
Communication signals for normal operation such as W and POWER-ON / OFF may be used as the second secret code.

Further, although the remote control transmitter is used as the second PIN input device in the above embodiment, the present invention is not limited to this, and the operation key of the operation unit for inputting the first PIN can be used. .

[Effect of device]

As described above, according to the present invention, the remote control device is provided in order to enable the normal operation of the device by inputting the specific signal (code) in the device with the anti-theft device for a fixed time. When the device is normally operated in the operation inspection and the regular inspection after a certain period of time, it is not necessary to input the personal identification number each time, and the inspector's work load can be reduced and the work efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram of an anti-theft device showing an embodiment of the present invention, FIG. 2 is a flow chart of processing of the present invention, FIG. 3 is a block diagram of an anti-theft device showing a conventional example, and FIG. The figure shows the flow chart of the conventional process. 2 ... Microcomputer, 6 ... In-vehicle tape player with radio, 10 ... Operating part, 11 ... Remote control receiver, 12 ... Remote control device.

Claims (2)

[Scope of utility model registration request] 1. A personal identification code input means for inputting a first personal identification code, a first personal identification code input by the personal identification code input means, and a first personal identification code provided in advance in the anti-theft device. A means for collating the code and a normal operation of the device when the coincidence of the first personal identification code is detected by the collating means, and the second personal identification code inputted by the personal identification code inputting means and the device are stolen in advance. An anti-theft device, characterized in that a second secret code provided in the prevention device is collated, and when the coincidence of the second secret code is detected, the normal operation of the device is allowed only for a predetermined time. . 2. A utility model registration claim characterized in that, as the personal identification code input means, the first personal identification code input means is provided in the body of the anti-theft device and the second personal identification code input means is a remote control transmitter. Anti-theft device according to claim 1.