JPH0688518B2 - Anti-theft device for in-vehicle electronic devices - Google Patents

Description

TECHNICAL FIELD The present invention relates to an antitheft device for an on-vehicle electronic device such as a car stereo device.

[Conventional technology]

There are two types of car stereo devices, one that is fixedly installed in the cockpit in the vehicle and one that is easily and removably installed. The reason for making it detachable is that the owner can remove it when he / she leaves the vehicle as a measure against theft.

As means for attaching / detaching this car stereo device, a main part attaching / detaching method in which only the main part of the car stereo device can be attached / detached, and a whole attachment / detachment method in which the entire car stereo device can be attached / detached from the cockpit There is (quick release method).

As shown in FIG. 4 to FIG. 6, the main part attachment / detachment method is such that an operation panel 101 arranged on the front surface of a cabinet 100 is detachably supported by an inner lid 102 which is pivotally mounted so as to be openable / closable. Open the operation panel 101 together with the inner lid 102 (5th
Then, only the operation panel 101 can be removed (FIG. 6). Regarding the opening / closing mechanism, Japanese Patent Application No. 1-076279 (see Japanese Patent Application Laid-Open No. 2-254694)
It is described in. Reference numeral 103 is a cassette tape insertion port. In the case of this method, since the central function part of the car stereo device is mounted in the operation panel 101, by removing the operation panel 101, it is possible to function as a car stereo device without the operation panel 101. Has become. Anti-theft measures are taken in this way.

In the whole attachment / detachment method, for example, a U-shaped handle is rotatably provided on the operation panel of the car stereo device, and by pulling out the handle, the engagement of the mechanism for locking the fixing between the cabinet 100 and the cockpit side is released. Thus, the entire car stereo device is removed. (Japanese Utility Model Application No. 60-161150 (see Japanese Utility Model Application Laid-Open No. 62-68843)). In the case of this method, the car stereo device itself is removed, so the theft itself does not occur.

[Problems to be Solved by the Invention]

However, there is a problem that the driver forgets to remove the car stereo device or the operation panel when leaving the vehicle regardless of whether the main part is attached or detached and the whole attachment or detachment system is used. In this case, the fact that it is easy to put on and take off causes a disaster, resulting in an easy theft.

Also, in the case of the main part attachment / detachment method, a drive mechanism for opening the operation panel 101 is required, but when a car battery is used as the drive source, the operation panel 101 cannot be opened by turning off the engine key switch. Things happen. This is because the car stereo device belongs to an accessory (auxiliary device), and therefore power is not supplied by turning off the accessory switch. Although depending on the opening / closing mechanism of the operation panel 101, even if the operation panel 101 can be opened by hand, it may happen that the operator forgets to open the operation panel 101 and eventually forgets to remove the operation panel 101.

It should be noted that such a problem is not limited to the car stereo device, and is similarly conceivable for other audio devices such as a detachable radio.

Therefore, an object of the present invention is to provide an antitheft device for an on-vehicle electronic device that can prevent forgetting to remove an on-vehicle electronic device such as a car stereo device. [Means for Solving the Problems] In order to solve the problem, the invention according to claim 1 is a theft prevention device for an on-vehicle electronic device, which is detachably mounted on a vehicle and receives power supply via an accessory switch, wherein the accessory switch is turned on and off. An accessory switch detection circuit for detecting and an alarm generation circuit for outputting an alarm signal for notifying that the on-vehicle electronic device is in the mounted state when the accessory switch is in the off state are configured.

In addition to the invention according to claim 1, the invention according to claim 2 is provided with an attaching / detaching device that makes the on-vehicle electronic device detachable from the vehicle when the accessory switch is in the off state.

[Action]

According to the invention of claim 1, the accessory switch detection circuit detects the "OFF" state of the accessory switch, and at the same time, the alarm generation circuit generates an alarm signal for informing that the on-vehicle electronic device is still in the mounted state. To do. As described above, since the alarm is issued in conjunction with the operation of the accessory switch performed immediately before getting off the vehicle, it is possible to alert the driver and prevent theft.

According to the second aspect of the invention, the attachment / detachment device sets the on-vehicle electronic device to a detachable state from the vehicle (including, for example, opening the operation panel and unlocking the handle). In this way, since the vehicle-mounted electronic device is attached and detached in association with the operation of the accessory switch performed immediately before getting off the vehicle, it is possible to call the driver's attention and prevent theft.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic diagram of this embodiment. The electric system in the vehicle is roughly divided into an engine system that supplies power from the car battery BATT to the starter motor 1 and an accessory system that supplies power to the electric components other than the engine, that is, the accessory 2.

An ignition switch 3 for starting the starter motor 1 is interposed in the engine system.

The accessory system includes an accessory switch 4 for enabling the accessory 2 to operate when the engine is stopped.
Is intervening. Normally, a three-position rotary switch is used as the engine key, and when the key can be pulled out, it is completely stopped, the accessory switch 4 is turned on at the next rotational position, and then the ignition switch 3 is turned on at the final rotational position. Is normal. In addition, in order to be able to light up even if you remove the key, such as interior lights,
The accessory 2 is provided with a backup wiring directly connected to the car battery BATT so that the backup voltage V _BUP is supplied. As the accessory 2, a car stereo device 7 and other accessories 8 are equipped. Reference numerals 5 and 6 are switches for individually operating the accessories.

Under the above-mentioned premise, a car stereo device 7 will be taken as an example of the vehicle-mounted electronic device, and the antitheft device for the vehicle-mounted electronic device according to the present invention will be described below.

As shown in FIG. 1, the anti-theft device 9 for an on-vehicle electronic device uses the backup voltage V _BUP as a power source to prevent the car stereo device 7 from being removed and prevent the car stereo device 7 from being removed. The display 10 issues an alarm as well as the detachable state.

FIG. 2 shows the configuration of the antitheft device 9 for vehicle-mounted electronic equipment. The anti-theft device 9 for an on-vehicle electronic device is based on an accessory switch detection circuit 11 that detects whether the accessory switch 4 is turned on or off based on the presence or absence of a supply voltage (hereinafter referred to as ACC voltage) V _ACC , and its detection signal V _S. removable and the drive signal V _D and an alarm signal control circuit 12 for outputting a control command V _C that outputs a V _BZ, removable drive signal V _D by the control command V _C, and outputs an alarm signal V _BZ Te, and complete detachment Signal V
Drive circuit 13 that stops output of alarm signal V _{BZ when turned off}
And, are included.

A buzzer 14 is used as the display 10, and an electric motor 15 is used as the opening / closing drive means. Instead of the electric motor 15, a plunger using an electromagnetic solenoid or the like may be used.

Although not shown, the accessory switch detection circuit 11 has an ACC
_{Lead the} voltage V _ACC from the output of the accessory switch 4,
A transistor can be used to generate a binary signal depending on the presence or absence thereof.

The control circuit 12 may be realized by setting a program using a microcomputer panel controller that is vehicle is started by the input of the detection signal V _S,
It is also possible to use the CPU of the car stereo device side.

Although not shown, the drive circuit 13 uses a power transistor or the like, and receives a backup voltage V by inputting a control command V _{C.
The BUP} is used as a power source and a switching circuit for supplying the attachment / detachment drive signal V _D and the alarm signal V _BZ to the buzzer 14 and the electric motor 15, respectively.

The attachment / detachment completion signal V _OFF is, for example, the contact terminal 1 shown in FIG.
This can be generated by utilizing the presence / absence of connection of the contact terminal 105 paired with the inner lid 102 side of 04. Alternatively, a limit switch or the like may be provided on the inner lid 102 so that the detachment completion signal V
It can also be configured to output _OFF .

Next, the operation will be described.

FIG. 3 shows a signal timing chart of each part of the antitheft device 9 for vehicle-mounted electronic equipment. Now, it is assumed that the backup voltage V _BUP is supplied and the accessory switch 4 is turned off at time t ₁ . Then, ACC voltage V _ACC
Changes from the “H” level to the “L” level, and the accessory switch detection circuit 11 outputs the detection signal V _S. In response to this detection signal V _S , the control circuit 12 outputs the control command V _C , and the drive circuit 13 provides the attachment / detachment drive signal V _D and the alarm signal V _BZ to the electric motor 15 and the buzzer 14, respectively. Then, the electric motor 15 opens the operation panel 101 together with the inner lid 102, as shown in FIG. 5, and the buzzer 14 emits an alarm sound. In this way, the accessory switch 4
The inner lid 102 is opened reliably and automatically even when the
An alarm sound is emitted so you can prevent forgetting to remove it.

Next, when the driver pulls out the operation panel 101 from the inner lid 102 (see FIG. 6), the attachment / detachment completion signal V _OFF is output, the drive circuit 13 is reset, and the output of the alarm signal V _BZ is stopped. From this, it can be confirmed that the removal of the inner lid 102 is completed.

In the above embodiment, the alarm signal is displayed by sound, but a warning is given by a flashing light signal,
Alternatively, both sound and light may be displayed. In that case, a display element such as a light emitting element may be used together with the buzzer 14. Further, in order to prevent the alarm signal from being continuously output, a timer may be used to limit the connection time of the alarm signal to a predetermined time.

〔The invention's effect〕

As described above, according to the present invention, even when the accessory switch is turned off, the on-vehicle electronic device can be detached from the vehicle, and since the alarm signal is issued, the on-vehicle electronic device can be reliably removed without forgetting. Theft can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an embodiment of the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, FIG. 3 is a timing chart of signals of respective parts of the embodiment of the present invention, and FIGS. It is a perspective view of a car stereo device of a main part detachable system. 4 …… Accessory switch 7 …… Car stereo device 9 …… In-vehicle electronic device anti-theft device 10 …… Display unit 11 …… Accessory switch detection circuit 12 …… Control circuit 13 …… Drive circuit 14 …… Buzzer 15… … Electric motor V _BUP …… Backup voltage V _ACC …… ACC voltage V _OFF …… Detachment completion signal V _S …… Detection signal V _C …… Control command V _D …… Detachment drive signal V _BZ …… Alarm signal

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaaki Watanabe 4-15-5 Omorinishi, Ota-ku, Tokyo Pioneer Co., Ltd. Omori Plant (56) References JP-A-61-64553 (JP, A)

Claims (2)

[Claims] 1. An antitheft device for an on-vehicle electronic device, which is detachably mounted on a vehicle and receives power from an accessory switch, the accessory switch detecting circuit detecting an on / off state of the accessory switch. An antitheft device for an on-vehicle electronic device, comprising: an alarm generation circuit that outputs an alarm signal for notifying that the on-vehicle electronic device is in a mounted state when the accessory switch is in the off state. 2. The anti-theft device for an on-vehicle electronic device according to claim 1, further comprising an attachment / detachment device for making the on-vehicle electronic device detachable from the vehicle when the accessory switch is off. An anti-theft device for in-vehicle electronic devices.