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JPH0560953

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH0560953
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for
example, a car stereo having a grill main body detachably attached to an apparatus main body,
and in particular, for a battery escaping in a vehicle having no accessory position in an ignition
switch. The present invention relates to a car stereo that is configured to prevent by paying
attention to the attaching and detaching function of the grill body.
[0002]
2. Description of the Related Art As a means of preventing theft accompanying the upgrading of
audio equipment such as car stereos, the grille body is a detachable type, and the machine body
itself is detachable from the installation location of the vehicle. Car stereos such as quick release
type have been commercialized.
[0003]
In particular, the detach type is intended to make it impossible to recognize the presence of the
acoustic device by removing the grill main body from the device main body when leaving the
vehicle.
[0004]
FIGS. 1 and 2 show an example of a detach type car stereo designed to prevent the theft, in
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which the grill body 20 is detachably attached to the apparatus body 10 embedded in a
dashboard of a vehicle or the like. It is provided.
The fitting body 11 is provided with a fitting recess 11 for fitting the grill body 20.
A connector 12 is provided on the right side in the fitting recess 11.
[0005]
A shutter 13 is slidably provided in the vicinity of the connector 12. By sliding the shutter 13
toward the closing side, each terminal described later in the connector 12 can be covered.
[0006]
A cassette insertion hole 14 is formed near the center of the fitting recess 11.
On the left side of the cassette insertion hole 14, a detachment detection switch 15 for detecting
the detachment of the grill body 20 is provided.
[0007]
The connector 12 is provided with a 5V power supply terminal 12a, a data input / output
terminal 12b, an 8V power supply terminal 12c, and a ground terminal 12d. A 5V power supply
circuit 17 and an 8V power supply circuit 18 are connected to the 5V power supply terminal 12a
and the 8V power supply terminal 12c.
[0008]
Power from the battery 31 of the vehicle is supplied to the 5V power supply circuit 17 and the
8V power supply circuit 18 via the backup line 31a and the ACC line 31b. Reference numeral 30
denotes an ignition key. When the ignition key 30 is off, the supply of power via the ACC line 31
b is interrupted. Also, the on / off of the ignition key 30 here means the on / off of the ACC
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position.
[0009]
A microcomputer (hereinafter referred to as a microcomputer) 19 is connected to the data input
/ output terminal 12b. The microcomputer 19 can monitor the change of the voltage of the ACC
position in the ignition key 30 through the line 31d, and can recognize that the ACC position is
off when the voltage of the ACC position decreases.
[0010]
On the back side of the grill body 20, a connector 21 connected to the connector 12 on the
device body 10 side is provided. Below the front surface side of the grill body 20, various
function buttons 22 such as a preset button are provided. At the middle stage on the front
surface side of the grill body 20, a display unit 23 for displaying information such as time and
reception frequency is provided. In the upper stage on the surface side of the grill body 20, a
cassette insertion port 24 communicating with the cassette insertion hole 14 on the device body
10 side when the grill body 20 is mounted is formed.
[0011]
The connector 21 is provided with a 5V power supply terminal 21a, a data input / output
terminal 21b, an 8V power supply terminal 21c, and a ground terminal 21d corresponding to the
respective terminals on the connector 12 side.
[0012]
A microcomputer 25 is connected to the 5V power supply terminal 21a and the data input /
output terminal 21b.
The microcomputer 25 sends out a control signal instructing to display information such as time
and reception frequency according to the operation mode of the various function buttons 22. The
display driver 26 controls the display operation of the display unit 23 based on the control signal
from the microcomputer 25. An illumination lamp 27 is connected to the 8V power supply
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terminal 22c.
[0013]
The basic operation of this kind of car stereo is as follows. The attachment / detachment state of
the grill body 20 to the device body 10 is determined by the microcomputer 19 detecting the on
/ off state of the attachment / detachment detection switch 15. When the microcomputer 19
recognizes the attachment of the grill main body 20, it sends predetermined control data to the
data input / output terminal 12b.
[0014]
At this time, due to the coupling of the connector 12 and the connector 21, 5V driving power is
supplied to the microcomputer 25 on the grill main body 20 side through the 5V power supply
terminals 21a and 12a. Upon receiving the driving power, the microcomputer 25 immediately
resets and then receives control data from the microcomputer 19 through the data input / output
terminals 12b and 21b, and based on this data, performs a predetermined operation on the
display driver 26. To do
[0015]
At this time, 8 V drive power is supplied to the 8 V power supply terminal 12c. For example,
when the lamp light switch (not shown) of the vehicle is on, the illumination lamp 27 is driven at
8 V drive power. It is supposed to receive an award.
[0016]
On the other hand, when the grill main body 20 is removed from the apparatus main body 10,
the microcomputer 19 stops the transmission of control data to the data input / output terminal
12b.
As described above, even if the data input / output terminal 12b on the connector 12 side and
the data input / output terminal 21b on the connector 21 side accidentally contact after the
removal of the grille main body 20 by cutting off the transmission of control data to the
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microcomputer 25 side. The display unit 23 is configured not to cause an erroneous display or
the like.
[0017]
In addition, since the respective terminals in the connector 12 can be covered by sliding the
shutter 13 to the closing side after removing the grille main body 20 from the apparatus main
body 10, electric shock or short circuit is prevented. It has become too.
[0018]
On the other hand, the supply state of the power from the battery 31 with the on / off of the
ignition key 30 is as follows.
[0019]
Power from the battery 31 is supplied to the 5V power supply circuit 17 via the backup line 31a
regardless of whether the ignition key 30 is on or off.
Here, the 5 V power supply circuit 17 mainly supplies drive power to the microcomputer 19, and
in the case where driving of a CPU (not shown) inside the microcomputer 19 is stopped, the
microcomputer is mainly 19 as a backup power supply for internal memory (not shown)
[0020]
When the ignition key 30 is turned on, the ACC line 31b and the battery 31 are connected, and
the power from the battery 31 is supplied to the 8V power supply circuit 18 through the ACC
line 31b.
Here, the 8 V power supply circuit 18 is mainly used as a drive power supply for a tape loading
mechanism (not shown) and the illumination lamp 27 on the grill main body 20 side.
[0021]
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When the ignition key 30 is turned off, the connection between the ACC line 31b and the battery
31 is cut off. However, on the 5V power supply circuit 17 side, as described above, even if the
ignition key 30 is turned off, the power from the battery 31 is supplied to the 5V power supply
circuit 17 via the backup line 31a. Ru.
[0022]
The state of consumption of power inside the microcomputer 19 with the turning on / off of the
ignition key 30 is as follows.
[0023]
The microcomputer 19 monitors the change of the voltage of the ACC position in the ignition key
30 through the line 31d, and detects the decrease in the voltage of the ACC position
accompanying the turning off of the ignition key 30, the CPU in the microcomputer 19 Stop the
predetermined action of
At this time, only the memory in the microcomputer 19 receives the power from the 5 V power
supply circuit 17 and maintains the information retention.
[0024]
Therefore, in the power consumption mode in the microcomputer 19, when the ignition key 30 is
turned off, the predetermined operation of the CPU is stopped and the low power consumption
mode is set, and the dark current from the 5V power supply circuit 17 is Since the occurrence is
eliminated, the problem that the battery 31 is lifted is eliminated.
[0025]
As described above, in the car stereo mounted on the vehicle having the ACC position, the
microcomputer 19 monitors the change in the voltage of the ACC position in the ignition key 30,
and thus the ignition is performed. When the key 30 is turned off, a predetermined operation of
the CPU in the microcomputer 19 is stopped to set the low consumption mode so that the
generation of dark current is eliminated and the battery 31 is prevented from rising.
[0026]
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However, some vehicles do not have the ACC position in the ignition key 30 depending on the
vehicle, and in the case of a vehicle not having the ACC position, the following problems occur.
[0027]
That is, in a vehicle not having the ACC position, in FIG. 2, the backup line 31a and the ACC line
31b are connected by the short circuit line 31c, and the ignition key 30 is turned off. Since the
power from the battery 31 is also supplied to the 5V power supply circuit 17 and the 8V power
supply circuit 18, the above-mentioned ACC position is equivalent to the state in which the power
is always on.
[0028]
Therefore, the CPU in the microcomputer 19 is in operation even though the ignition key 30 is
turned off. Therefore, in addition to the power to be supplied only to the memory in the
microcomputer 19, the driving power of the CPU itself is Also, a large amount of dark current is
consumed, resulting in a problem of battery drain.
[0029]
The present invention has been made to cope with such a situation, and prevents the battery
from rising by preventing the generation of the dark current in the equipment equipped in the
vehicle having no accessory position in the ignition key. It aims to provide a car stereo that can
[0030]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention
relates to a car stereo system having a grill main body detachably mounted to an equipment
main body mounted on a vehicle. When the detachment of the grille body is detected by the
detachment detection means for detecting the detachment of the body and the detachment
detection means, a mode for shifting the operation of the microcomputer on the device body side
from the normal operation processing mode to the low consumption operation processing mode
And a transition means.
[0031]
In the car stereo according to the present invention, it is intended to prevent the battery from
rising due to the device mounted on the vehicle having no accessory position in the ignition key,
and the detachment detection means detects the detachment of the grill body. At this time, the
mode transition means causes the operation of the microcomputer on the device body side to
shift from the normal operation processing mode to the low consumption operation processing
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mode.
[0032]
Thus, even if the vehicle is equipped with the equipment without the accessory position in the
ignition key, generation of dark current during normal operation in the microcomputer when the
grille body is removed from the equipment body Can prevent the battery from rising.
[0033]
Embodiments of the present invention will be described in detail with reference to the drawings.
In the drawings described below, the same reference numerals are given to parts common to
FIGS.
[0034]
FIG. 3 shows the internal configuration of the car stereo according to the present invention, and
the device body 10 is provided with a 5V power supply terminal 12a, a data input / output
terminal 12b, an 8V power supply terminal 12c and a detach sense terminal 15a. ing.
The microcomputer 19 is connected to each terminal.
In the figure, reference numerals 10B and 10C denote switching circuits, and when the switching
circuits 10B and 10C are turned on by the control of the microcomputer 19, driving powers of 8
V and 5 V in FIG. 2 are respectively supplied. .
[0035]
The detection results from the detection circuit 10A for detecting the voltage states of the battery
and the ACC position are taken into the terminals of ASENS and BSENS of the microcomputer 19
respectively.
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[0036]
An analog signal from a device such as an equalizer (not shown) is taken into each of the
terminals KD1 and KD2 of the A / D port of the microcomputer 19.
[0037]
When a detach sense terminal 15b of the grille main body 20 described later is connected to the
detach sense terminal 15a, an "L" level signal of the reference voltage VDD is taken in to the
terminal of the DSENS of the microcomputer 19 There is.
Thus, the microcomputer 19 can detect the mounting of the grill body 20.
In the drawing, SWDVDD and KEYDATA respectively indicate a terminal for outputting a control
signal for controlling the on / off operation of the switching circuit 10B and a terminal for
receiving key data from the side of the grill main body 20.
[0038]
The grill main body 20 is provided with a 5V power supply terminal 21a, a data input / output
terminal 21b, an 8V power supply terminal 21c, and a detach sense terminal 15b corresponding
to the respective terminals on the apparatus main body 10 side.
[0039]
A microcomputer 25 is connected to the 5V power supply terminal 21a and the data input /
output terminal 21b.
An illumination lamp 27 is connected to the 8V power supply terminal 22c.
[0040]
The basic operation of the car stereo with such a configuration is as described above, and in the
low consumption operation processing mode of the microcomputer 19, the operation is
performed according to the flow shown in FIG.
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[0041]
That is, when the ACC position of the ignition key 30 is turned on (step 401), the attachment /
detachment state of the grill body 20 with respect to the device body 10 is judged (step 402),
and the grill body 20 is attached to the device body 10 If it is determined that there is a normal
operation processing is performed (step 403).
The normal operation processing here is to turn on the SWDVDD terminal and A / D port of the
microcomputer 19 on the side of the device main body 10, or to put the KEYDATA terminal in a
standby state.
[0042]
At this time, the microcomputer 19 is driven by the reference voltage VDD as shown in FIG. 5 (a).
[0043]
On the other hand, when it is determined that the ACC position of the ignition key 30 is off in
(steps 401 and 402), and when it is determined that the grill body 20 has been removed from
the device body 10, low consumption is achieved. Operation processing is performed (step 40)
[0044]
That is, the low consumption operation processing here intermittently stops turning on the
SWDVDD terminal and A / D port of the microcomputer 19 on the side of the device main body
10 described above, and putting the KEYDATA terminal in the standby state. It is to
Thus, power is received only for the memory in the microcomputer 19 to maintain information
retention.
At this time, as shown in FIG. 5B, the microcomputer 19 is turned off every 30 ms period.
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However, the above-described normal operation process is performed only during a period of
rising to VDD every 30 ms.
[0045]
If disconnection of the grill main body 20 is detected during normal operation processing (step
405), terminal setting processing at the time of removal from the grill is performed, and a grill
status flag is set (steps 406 and 407).
[0046]
On the other hand, when attachment of the grill main body 20 is detected (step 405), terminal
setting processing at the time of grill attachment is performed, and the grill state flag is cleared
(steps 408 and 409).
[0047]
When the ACC position of the ignition key 30 is turned on at step 410 (step 410), the state of the
flag at (steps 407 and 409) is judged (step 411), and the flag is set. If it is determined, the
presence or absence of an operation of an alarm setting key (not shown) is determined (step
412)
[0048]
The setting of the alarm here is to specify whether to sound an alarm or not when the
microcomputer 19 detects that the grill main body 20 has been removed while the ignition key
30 is in the off state. (Steps 414 and 415) In the case of setting on (Step 412), it is possible to
indicate that the grill main body 20 has been removed due to an alarm sound (Step 415).
Further, the alarm setting key is provided at a predetermined position on the grill main body 20
side.
[0049]
On the other hand, when the ACC position of the ignition key 30 is turned off at (step 410), the
state of the flag at (steps 407 and 409) is judged (step 416), and it is judged that the flag is in the
set state. In this case, the presence or absence of the operation of the alarm setting key is
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determined in the same manner as described above (step 417). When the setting is on, an alarm
sound is emitted (step 418).
[0050]
As described above, in this embodiment, when the microcomputer 19 detects the OFF state of the
ACC position or the detachment state of the grill body 20, the SWDVDD terminal and the A / D
port which are normal operation processing of the microcomputer 19 itself are The operation to
turn on or to put the KEYDATA terminal in the standby state is intermittently stopped to perform
the low consumption operation processing that consumes power only when information in the
memory in the microcomputer 19 is held.
[0051]
Therefore, since the low consumption operation can be performed to the microcomputer 19 by
detecting the attachment / detachment state of the grill main body 20, the case where the ACC
position is not provided in the ignition key 30 in FIG. 2, that is, backup Even when the line 31a is
directly connected to the ACC line 31b via the short circuit line 31c, a large amount of dark
current is not consumed, so that the battery can be prevented from rising.
[0052]
[Effects of the Invention] As described above, according to the car stereo of the present invention,
it is intended to prevent the battery from rising due to the device mounted on the vehicle not
having the accessory position in the ignition key, When the disconnection of the grill body is
detected by the detection means, the mode transition means causes the operation of the
microcomputer on the apparatus body to shift from the normal operation processing mode to the
low consumption operation processing mode.
[0053]
Thus, even if the vehicle is equipped with the equipment without the accessory position in the
ignition key, generation of dark current during normal operation in the microcomputer when the
grille body is removed from the equipment body Can prevent the battery from rising.
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