JP3231089B2 - CD autochanger anti-theft device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-theft device for a CD autochanger.

[0002]

2. Description of the Related Art Generally, a CD autochanger has not been provided with an anti-theft function, and a head for controlling the autochanger itself has an anti-theft function.

[0003]

However, in the above case, even if the anti-theft system is functioning on the head itself, the auto-changer itself does not have the anti-theft function. Even when connected to another head, there is a problem that the head operates without any hindrance, and there is a drawback that it is not useful for preventing theft. The present invention solves such a problem of the prior art, and when the power is turned off and the power is connected again, it can be used only when the disk storage state matches a predetermined password. It is an object of the present invention to provide an anti-theft device for a CD autochanger having an anti-theft function.

[0004]

In order to achieve the above object, the present invention provides an anti-theft device for a CD autochanger. In a CD autochanger capable of storing a plurality of discs, a disc detection for detecting the storage status of the stored discs. Means, a storage means for storing a personal identification code, a code setting means for encoding and setting the storage state of the disc detected by the disc detection means, and a detachment detection means for detecting that the CD autochanger has been removed from the vehicle. And comparing the code set by the code setting means with the password read out from the storage means based on the power-on after the detachment from the vehicle is detected by the detachment detection means, And a control means for performing a normal operation.

[0005]

When the CD autochanger is removed from the vehicle due to theft, etc., this is detected by the removal detection means, and when the power is turned on after the detection, the storage state of the disk detected by the disk detection means and coded by the code setting means. Is compared with the password stored in the storage means. If the code does not match the password as a result of the comparison, normal operation is disabled.

[0006]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a block diagram of a CD autochanger to which the antitheft device of the present invention is mounted, and includes a disk magazine 10, a disk detection unit 11, and a magazine detection unit 12.
, A disk mechanism 13, a disk reproducing unit 14, and a microcomputer 16. The microcomputer 16 includes a control unit 15, a storage unit 2, a code setting unit 3, and a control unit 4. The storage means 2, the code setting means 3, the control means 4, and the code storage push button 1 form an anti-theft device 5.

In accordance with a predetermined command, the control unit 15 confirms the mounting of the magazine 10 via the magazine detecting unit 12, and confirms the storage of the disk in the disk storing unit 5b by the disk detecting unit 11, for example, the disk detecting unit 5a. After that, the disk control unit 13 and the disk reproducing unit 14 are configured to perform disk control such as disk exchange and reproduction. As described above, the disk detecting means 11 is composed of the disk detecting units 1a to 6a, and is configured to detect the storage state of the disk in each disk storage unit (six in this case) of the magazine 10, that is, the presence or absence of the disk. I have. The code setting means 3 uses the disk detecting means 11 to store each disk storage portion 1b of the magazine 10.
6b, the presence / absence of a disk, which is the storage state of the disk, is detected as a binary code, and "1" is set as a binary code when the presence of a disk is detected by each of the detection units, and "0" is set when no disk is present. For example, the disk storage units 1b and 5
When there is a disk in b, the setting code is set to 100010. The storage means 2 stores the setting code indicated by the combination of the presence / absence of a disk in each storage section, which is the storage state of the disk storage section, by the operation of the code storage button 1, and the loading / unloading of the magazine 10 is performed in the magazine. The number of times of detection by the detection unit 12 is also stored. When the power switch of the autochanger is turned on, whether or not the autochanger has been previously removed, that is, whether or not the backup power supply (B power supply) has been removed, is stored in the memory at the time of removal. It is.

When the power switch of the autochanger is turned on and the power is turned on, the control means 4 outputs C from the vehicle.
D is stored in the memory as to whether or not the autochanger has been removed. If the autochanger has not been removed, the autochanger is configured to operate as usual. It is set in the disk reproducing unit 14 and reproduced. When the autochanger has been removed, the presence or absence of a disk at each storage position in the magazine 10 is checked by the disk detection means 11.
, The code is set by the code setting means 3, and the security code, which is the setting code before removal, already stored via the storage means 2 is read by the code storage button 1, and the previously set code is set. Is to be compared with. As a result of this comparison, when the security code and the setting code match, the normal operation is performed. When the security code does not match, the disc in the magazine 10 is replaced and the setting code reset and compared with the security code. Is performed up to 4 more times, and when the mismatch is repeated up to 5 times, it is locked for 6 hours to make it unusable. Note that the number of times the magazine 10 is taken in and out can be detected by the magazine detection unit 12. Further, the contents of the memory are retained by the internal battery even when the backup power supply is disconnected with respect to the personal identification code.

The operation of the above embodiment will be described with reference to a flowchart shown in FIG. When the power switch is turned on (step 21), it is checked whether or not the CD autochanger has been removed from the vehicle (step 22). If it has not been removed, normal operation is enabled, and a predetermined disk in the magazine is taken out by the disk mechanism unit 13 and set in the disk reproducing unit 14 to be reproduced (step 26). If the disk has been removed, the disk detecting means 11 detects the presence or absence of a disk in each disk storage section of the magazine 10, and the code setting means 3 sets a binary code (step 24).
The control means 4 makes a comparison as to whether or not the password coincides with the password stored in the step (step 25). If they match, a normal operation is performed as described above, a predetermined disk is taken out, and disk control such as set reproduction is performed on the disk reproducing unit 14 (step 26). If they do not match, it is checked how many times the number does not match (step 27). If the number of mismatches is five, the operation of the CD autochanger is locked for six hours (step 28). Until the number of discrepancies is five, the removal of the magazine is checked (step 29), the storage position of the disk is changed, and it is checked that the magazine whose storage position is changed is inserted (steps 30 and 31). , And the above operation is repeated.

The operation of storing a personal identification code will be described. When the code storage button 1 is turned on (step 20), the disk detecting means 11 determines whether or not the disk is stored in the magazine 10.
(Step 21), the presence or absence of the storage is coded by the code setting means 3 (Step 22), and the code is stored in the storage means 2 in advance as a personal identification code.

By utilizing the fact that a plurality of disks can be stored in the magazine of the CD autochanger as described above, the combination of each disk storage section and the presence or absence of a storage disk is converted into a binary code and stored in advance. When the backup power is removed from the vehicle and the power is turned on again to check whether or not the disc is in the specific location, comparing with a security code whether or not a disc is present at a previously stored position. When the disc is stored in the same position, the normal operation is performed. or,
If the disc is in the wrong position, it will operate normally if the disc is stored in the correct position. The re-storing operation is performed up to five times. If the re-storing operation is not performed at the correct position five times, the device is locked for a predetermined time. It is also possible to operate when the head side enters the car line mode. Also, the personal identification code can be stored as a ROM.

[0012]

According to the anti-theft device for a CD autochanger of the present invention described above, the anti-theft function can be provided by a CD autochanger alone.

[Brief description of the drawings]

FIG. 1 is a block diagram of a CD autochanger equipped with the anti-theft device of the present invention.

FIG. 2 is a flowchart showing the operation of the anti-theft device for a CD autochanger of the present invention.

[Explanation of symbols]

 1: code push button 2: storage means 3: code setting means 4: control means 5: anti-theft device 11: disk detection means 12: magazine detection section 13: disk mechanism section 14: disk reproduction section 15: control section 16: microcomputer

Claims (2)

(57) [Claims] 1. A CD autochanger capable of storing a plurality of discs, a disc detecting means for detecting a storage condition of the stored discs, a storage means for storing a personal identification code, and a disc detecting means for detecting discs detected by the disc detecting means. Code setting means for coding and setting the storage status; detachment detection means for detecting that the CD autochanger has been detached from the vehicle; and power-on after the detachment from the vehicle is detected by the detachment detection means. Control means for performing a normal operation when the code set by the code setting means and the security code read from the storage means match, and a normal operation is performed. apparatus. 2. The anti-theft device for a CD autochanger according to claim 1, wherein said storage means detects a storage state of the disk by said code setting means and stores a code set as a security code.