JPH051012Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an in-vehicle information reproducing device such as an in-vehicle magnetic tape player such as a so-called car stereo, an in-vehicle digital audio disk player, and the like.

[Conventional technology]

FIG. 3 shows a block diagram of a conventional in-vehicle information reproducing device. In the figure, reference numeral 1 denotes a control means consisting of a microcomputer or the like, to which a constant voltage is supplied from a constant voltage circuit 2. Reference numeral 3 denotes a display for displaying the operating status etc. instructed by the control means 4. 4 is an operating means for driving a recording medium such as a cassette tape in a car stereo, for example. 5 is a detection circuit which supplies a high potential or low potential signal to the control means 1 to detect whether the switch 6 is on or off in response to the on or off of a switch 6 such as an accessory switch in an automobile; It is composed of R ₁ , R ₂ and a Zener diode D. Reference numeral 7 denotes a battery mounted on the automobile, which supplies power to various circuits, means, etc. Reference numeral 8 denotes an operation detection circuit which detects the operating state of the operating means 4 and outputs it to the control means 1.

Next, to explain its operation, the control means 1
A constant voltage is always supplied to the constant voltage circuit 2 through the constant voltage circuit 2. When a switch 6 such as an accessory switch is turned on, a high potential signal is applied to the control means 1 via the detection circuit 5, and the control means 1 is enabled. For example, when a cassette (not shown) is installed, the control means 1 displays a message to that effect on the display 3.
While detecting this, the operating means 4 starts operating and reproduces the information. Further, when the switch 6 is turned off, the control means 1 becomes disabled and the operation of the operating means 4 is stopped. Therefore, operation and stopping of the operating means 4 can be controlled to a certain extent by operating the switch 6.

Further, when the operation means 4 does not complete its operation within a predetermined time in response to a command from the control means 1, the operation detection circuit 8 detects this. At this time, control means 1
stops the operation of the operating means 4, and also stops the subsequent operation unless the play button or the like is operated again, assuming that it is inoperable due to some kind of trouble.

[Problem that the invention attempts to solve]

By the way, as shown in FIG. 4, when the starter is turned on when starting the engine, the voltage of the battery 7 generally drops rapidly and significantly.
As a result, such conventional devices tend to malfunction when the engine is started, and if this is detected by the motion detection circuit, the operation cannot be restored unless a manual command is given to restart the operation, which not only makes the operation complicated but also For example, if the player stops in a playing state and does not notice this, the pinch roller and capstan remain pressed together, resulting in deformation of the pinch roller.

[Means for solving problems]

FIG. 1 shows a block diagram of the in-vehicle information reproducing device of the present invention. In the same figure, parts corresponding to those in FIG. 3 are given the same reference numerals.
The detailed explanation will be omitted. In the present invention, a voltage detection circuit 9 is further provided to detect the voltage of the battery 7 and supply the result to the control means 1.

[Effect]

The operation will now be explained. A constant voltage is always supplied to the control means 1 via a constant voltage circuit 2. When a switch 6 such as an accessory switch is turned on, a high potential signal is applied to the control means 1 via the detection circuit 5, and the control means 1 is enabled. For example, when a cassette (not shown) or the like is inserted, the control means 1 detects this and displays this on the display 3, while causing the operating means 4 to start operating and reproducing information. Also switch 6
When the control means 1 is turned off, the control means 1 enters a disabled state and stops the operation of the operating means 4. Further, when the operation means 4 does not complete its operation within a predetermined time in response to a command from the control means 1, the operation detection circuit 8
detects it. At that time, the control means 1 stops the operation of the operating means 4, and stops the subsequent operation, assuming that there is some kind of trouble and the operation is not possible. These operations are similar to those in FIG.

By the way, when the engine is started, the voltage of the battery 7 drops rapidly as shown in FIG. 4, and the operating means 4 becomes susceptible to malfunction. Therefore, when the voltage of the battery 7 drops below the limit value at which the operating means 4 malfunctions when the engine is started, the voltage detection circuit 9 detects this (Fig. 2 a, b), and outputs an information signal to the control means 1. (2nd
(Fig. c), prohibits the display on display 3 (second
d), and further the operation of the operating means 4 is stopped (FIG. 2e). Also, a signal is sent to the motion detection circuit 8 at approximately the same timing as the muting motion,
The detection operation of the operation detection circuit 8 is prohibited (FIG. 2f). As a result, even if the operating means 4 does not complete its operation within a predetermined time when the voltage drops, the operation detection circuit 8 does not output an error signal, and the operation after the voltage is restored is prohibited. never remain in contact.

When the voltage is restored, the control means 1 cancels the inhibition of the display on the display 3 and the detection operation of the operation detection circuit 8 (FIG. 2 d, f), and also cancels the operation stop command (FIG. 2 e). Further, after canceling the operation stop signal, the control means 1 outputs a release signal to the operation means 4. For example, in the case where the operating means 4 has a mechanism for driving a pinch roller, magnetic head, etc. by so-called power assist, it is possible to temporarily return a flywheel or the like that has stopped mid-operation due to a drop in voltage to the operation starting position. . Therefore, when the operation detection circuit 8 restarts the detection operation after voltage recovery, a situation in which the mechanism is detected to be stopped mid-operation and subsequent sequence operations are prohibited does not occur. For example, when the cassette remains attached, the control means 1 controls the operating means 4 to proceed to a further playing operation. Muting is canceled after the voltage is restored almost simultaneously with this play operation.

A delay time t ₁ is provided between the generation of the voltage drop detection signal and the output of the muting-on signal, the display prohibition signal of the display 3, or the detection operation prohibition signal of the operation detection circuit 8,
Malfunctions due to chattering are prevented. Further, the operation of the operating means 4 is stopped with a delay of time _t2 after the mute is performed. This is action method 4 before Miyuto.
This is to avoid abnormal sounds that may be played if the operation is stopped. When the voltage is restored, the control means 1 returns the operating means 4 etc. to the original operable state, but after the detection signal disappears, the operating means 4 is returned to the operable state with a delay of time _t3 , and then The release operation is started after a delay of time _t4 . This is also to prevent malfunctions due to chattering.

〔effect〕

As described above, in the present invention, when the voltage detection circuit detects a voltage drop when starting the engine, the detection operation of the operation detection circuit is prohibited.
There is no risk that subsequent operations will become impossible after the voltage is restored.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the in-vehicle information reproducing device of the present invention, Fig. 2 is its timing chart, Fig. 3 is a block diagram of a conventional in-vehicle information reproducing device, and Fig. 4 is a block diagram of the in-vehicle information reproducing device of the present invention.
The figure is a voltage waveform diagram of the battery during operation. DESCRIPTION OF SYMBOLS 1... Control means, 2... Constant voltage circuit, 3... Display, 4... Operating means, 5... Detection circuit,
6...Switch, 7...Battery, 8...Operation detection circuit, 9...Voltage detection circuit.

Claims (1)

[Claims for Utility Model Registration] (1) A battery, a voltage detection circuit that detects the voltage of the battery, and a voltage detection circuit that receives power from the battery and operates the recording medium to reproduce information from the recording medium. An operating means, a control means for controlling the operating means, and an operation detecting means for detecting the operating state of the operating means, and when the voltage detection circuit detects a drop in the voltage of the battery at the time of starting the engine. An in-vehicle information reproducing device characterized in that the detection operation of the operation detection means is prohibited, and the inhibition of the detection operation is canceled when the voltage is restored. (2) The in-vehicle information reproducing device according to claim 1, wherein when recovery of the voltage is detected, the control means makes the operating means operable again. (3) The in-vehicle information reproducing device according to claim 2, wherein the control means releases the operating means when recovery of the voltage is detected. (4) Utility model registration claim 1, 2 or 3, characterized in that the control means once releases the operating means and then puts it into the playing state again.
The in-vehicle information reproducing device described in Section 1. (5) The in-vehicle information reproducing device according to claim 3 or 4, wherein the release is performed a predetermined time after the recovery of the voltage is detected. (6) Any one of claims 1 to 5 of the utility model registration claim characterized in that the detection operation of the operation detection circuit is prohibited after a predetermined period of time has passed after the voltage drop is detected. The in-vehicle information reproducing device described above. (7) The in-vehicle device according to any one of claims 1 to 6 of the utility model registration claim, characterized in that when the voltage drop is detected, the control means stops the operation of the operating means. information reproducing device. (8) The in-vehicle information reproducing device according to claim 7, wherein the operation of the operating means is stopped after a predetermined time has elapsed after the voltage drop is detected. (9) The in-vehicle information reproducing device according to claim 7 or 8, wherein the reproduction signal of the information is muted before the operation of the operating means is stopped.