JPS58212639A - Controlling circuit of deck - Google Patents

Abstract

PURPOSE:To remove the complexity of operation and to prevent the damage of a pinch roll and the discharge of a battery, by detecting the operation of the deck and using a buttery power source as a deck power source even if an accessory power source is turned off for a fixed time. CONSTITUTION:When the deck 5a is stopped, the power source of a deck device 5 can supply and stop the battery (B) power source 1 as the accessory (ACC) power source by a switch 2. When the deck 5a is actuated, a detecting circuit 7 detects the operation of the deck 5a and electric power is supplied also from the B power source 1 to the deck device 5 by a power supply stopping circuit 8 without passing through the switch 2. If the ACC power source is opened, a timer circuit 6 is driven, and after passing a fixed period, outputs a stop signal to a logical circuit 5b to stop the deck 5a. Consequently, power supply from the B power source 1 to the deck device 5 is stopped by the detecting circuit 7 and the power source stopping circuit 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a deck control circuit for controlling the drive of an on-vehicle tape deck.

If the power supply to the deck is stopped while the deck is in operation,
Since the deck stops in the driving state, it comes into contact with the capstan and the pinch roller.

The pinch roller may be damaged. Conventionally, there has been a pinch-off circuit shown in FIG. 1 as a circuit for this purpose. In the figure, (1) is the power supply, (2) is this power supply (1)
(3) is a switch that is linked to switch (2), (4) is charged from the power supply (1) through switches (2) and (3), and when switch (2) is open, The capacitor (5) is a deck device that includes a deck and a control circuit to which the power (1) is supplied when the switch (2) is closed. .

In this circuit, the switch (2) is supplied with power (1) to the capacitor (5) by the switch (2), and the capacitor (4) is charged by the switch (3), and then the switch (2) is opened. If so, the supply of power (1) to the decking device (5) is stopped, and the switch (3) linked to the switch (2)
As a result, the charge stored in the capacitor (4) is discharged. This discharge is used as a final power source for releasing the contact between the capstan and the pinch roller (pinch-off).

In a circuit configured in this way, if the power supply is disconnected, it is difficult to continue driving the deck for a long time.
In addition to the pinch-off circuit, a separate circuit is required, and if this is done by charging and discharging a capacitor, the capacitance of the capacitor becomes large.

This invention eliminates the above-mentioned drawbacks of the conventional technology, and also allows the tape to continue to be driven using battery power for a certain period of time in the event that the supply of accessory power is stopped. The purpose of the present invention is to provide a deck coat roll circuit that can also stop the supply of.

An embodiment of the present invention will be described below with reference to the drawings. In Figure 2, (1) is a battery power supply (hereinafter referred to as "B power supply").
), (2) uses the B power supply (1) as an accessory power supply (hereinafter referred to as 1'-ACC power supply), with a switch that is turned on and off by a starter etc., (5m) is a deck, (6b
) is the logic circuit that controls Detsuki (6 phoenix),
(5) is a deck device including a deck (6m) and a logic circuit (6b), and (6) is connected to the ACC power supply by the switch (2), and when the ACC power supply is opened, the logic circuit is connected after a certain period of time. (6b) is a timer circuit that generates a stop signal; (7) is a detection circuit that detects whether or not the deck (5) is being driven; (8) is a circuit that receives the signal from the detection circuit (7) and detects whether the deck (5) is being driven; If (5a) is in operation, the B power supply (1) is redundantly supplied with power to the deck (5a) and the logic circuit (5b), and if the deck (6a) is stopped, the B power supply (1) A power supply stop circuit that stops the supply of (
9) applies the ACC power to the logic circuit (5b) via the switch (2), and also connects the power supply stop circuit (8) to the logic circuit (5b).
) is a diode that prevents the B power supply (1) from supplying current to the timer circuit (6).

Next, the operation will be explained. When the deck (5a) is in a stopped state, the power supply for the deck device (5) is turned on by the switch (2).
), the B power supply (1) can be supplied and stopped as an ACC power supply. When ACC power is supplied, ! By → manual operation of the logic circuit (5b), the deck (6
a) performs various operations such as play, stop, fast forward, and winding calendar. When the deck (6m) operates, the detection circuit (7) detects the operation of the deck (6a), and the power supply stop circuit (8) causes the switch (
Power is supplied to the deck device (5) without going through 2).

In this state, even if the ACC power supply is opened by the switch (2), the power supply stop circuit (8) will stop the B power supply (1).
) is supplied to the deck device (5), the operating state of the deck (6@) before the ACC power supply is opened continues.

When the ACC power supply is opened, the timer circuit (6) is activated, and after a certain period of time, a stop signal is generated to the backside chic circuit (6b), and the deck (6a) is brought to a halt.

When the deck (6m) is in a stopped state, the detection circuit (7) and the power supply stop circuit (8) stop supplying the B power supply (1) to the deck device (5).

FIG. 8 shows a more specific example of the circuit shown in FIG. 2. In the timer circuit (6), (6m) is a capacitor that determines the time limit of the timer (6b) is a transistor that turns 0FF- after a certain period of time and generates a stop signal to the silosic circuit (5b) when the ACC power supply is opened. , (e
c), (6a) are the resistors that determine the time limit of the timer and act as bias for the transistor (6b), (6e) is the limiting resistor of the transistor (6b), and (6f) is the capacitor that is used when the ACC power supply is open circuit. This is a diode that prevents the charge in (6a) from flowing out to the logic circuit (5b).

The deck operation detection circuit (7) detects the rotational output of the motor (terminal voltage of the motor), and supplies the detection output to the power supply stop circuit (8). In the power supply stop circuit (8), (8@) is a transistor that is turned on in response to the rotational output of the motor during the operation of the deck (61), (8b) is a bias resistor of the transistor (8m),
(8c) shows the transistor (8c) during operation of the deck (61).
Transistor (8d), which supplies the ONL, B power supply (1) to the deck device (5) by turning ON
(8e) is a bias resistance of the transistor (8C).

In this circuit, while the deck (6a) is in operation, the B power supply (1) is supplied to the deck device (5) through the switch (2) and the transistor (8c), and the switch (
2) Red capacitor (6m) is charged via.

In this case, since the transistor (6b) is turned on, no stop signal is applied to the logic circuit (5b), and the deck (5a) continues to operate. Next, when the fiAcc power supply is opened by the switch (2), the charge in the capacitor (61) is discharged through the resistors (ec) and (6d), the transistor (6b) is turned off after a certain period of time, and the logic circuit ( A stop signal is generated for 6b). The deck (6 rin) can continue to operate from the time the ACC power supply is disconnected until the stop signal is generated. If a stop signal is generated, the transistor (8c)
The deck (6a) is powered by the 9B power supply (1) via the
transitions to a stopped state (pinch-off circuit). Detsu + (
6m) is stopped, the output of the detection circuit (7) disappears.

The transistors (8m) and (8c) are both turned off, stopping the supply of the B power supply (1) to the decking device (5).

In the above embodiment, the deck (5
m) was detected, but the detection target was deck (6).
It goes without saying that any detection can be used as long as it indicates that the head is in a stopped state; for example, the same effect can be achieved by detecting the position of the head.

As described above, according to the present invention, even if the ACC power supply is turned off for a certain period of time, such as when starting, the operation of the deck is detected and the B power supply is supplied as the deck power supply, so that the deck continues to operate. This eliminates the trouble of having to repeatedly operate the deck every time the ACC power is turned off. In addition, when the ACC power is turned off for a long period of time, the deck automatically comes to a halt, which eliminates damage to the pinch row 2 and prevents damage to the battery.

[Brief explanation of the drawing]

FIG. 1 is a conventional pinch-off circuit, and FIG. 2 is a block circuit diagram showing an embodiment of the deck control circuit of the present invention.
FIG. 8 is a circuit diagram showing FIG. 2 more specifically. (1)...Battery power supply, (2)...Switch, (
5)...Deck device, (5a)...Deck s (
sb)...Logic circuit. (6)...Timer circuit, (7)...Detection circuit, (8
)...Power supply stop circuit. In addition, the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) A logic circuit that controls the deck, a means for providing accessory power to this logic circuit, and a stop signal that causes the logic circuit to stop the deck after a certain period of time if the accessory power is opened. A timer circuit that supplies battery power to the logic circuit that receives the signal from the detection circuit while the deck is in operation, and a detection circuit that detects the drive of the deck, and a detection circuit that receives the signal from the detection circuit while the deck is operating. A deck control circuit comprising: a power supply stop circuit that receives a signal from the logic circuit and stops supplying battery power to the logic circuit.