JPH0546631B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a power supply control circuit for a vehicle-mounted audio disc player having a compact disc insertion and ejection mechanism.

(Prior Art) A power supply control circuit for a conventional in-vehicle audio disk player is shown in FIG. Door switch closed by insertion, 6 is AND
7 is a main power switch, 9 is a CPU, 10 is a loading motor drive circuit control signal, 11 is a loading motor drive circuit, 12 and 13 are disk detection switches, and when the accessory switch 3 and door switch 5 are closed, AND circuit 6
This allows the main power switch 7 to be closed.

(Problems to be Solved by the Invention) In the power control circuit of the conventional vehicle-mounted audio disc player described above, if the accessory switch 3 is turned off while a disc is being inserted or ejected, the main power switch 7 is turned off. When the loading motor drive circuit 11 is turned off, the loading motor stops, the disk stops midway, and it is not only impossible to take out the disk, but also the disk may be damaged by the door opening/closing mechanism of the deck. It was hot.

SUMMARY OF THE INVENTION In view of the above points, it is an object of the present invention to enable a disk to be completely inserted or ejected even if the accessory switch is turned off during insertion or ejection of the disk.

(Means for Solving the Problems) The present invention provides a loading motor drive circuit for inserting or ejecting a disk, a main power switch for controlling the power supply of the loading motor drive circuit, and an accessory switch for an automobile. When the door switch of the deck section is closed, an AND circuit outputs a main power switch control signal, a disk detection means detects whether the operation of inserting or ejecting a disk into the deck section is completed, and the disk detection means The central processing unit continues to output the main power switch control signal until the completion of the disk insertion or ejection operation is detected, and when the main power switch control signal is input from the AND circuit and the central processing unit, the main power switch is closed. and an OR circuit that energizes the loading motor drive circuit.

(Function) The main power switch that controls the power of the loading motor drive circuit is controlled by the output signal of the AND circuit which receives the accessory switch signal and the door switch signal, and the CPU inserts the disk.
The accessory switch was turned off in the middle of inserting and ejecting a disk by using the output signal of an OR circuit that takes as input the main power switch control signal that is output during ejection until the operation is completed. Even if a disk is inserted or ejected, the CPU outputs until the operation is completed.
Since the signal from 1 is input to the OR circuit, the loading motor does not stop until the above operation of the disk is completed, and the disk is completely inserted and ejected.

(Embodiment) FIG. 1 shows an embodiment of the present invention. Components similar to those of the conventional control circuit shown in FIG. This is an OR circuit that inputs the main power switch control circuit 15 that outputs from the central processing unit (hereinafter referred to as "CPU 9") during the insertion and ejection operations until the operation is completed.

Next, to explain the operation, when the accessory switch 3 is closed, the disk 16 is inserted, and the door switch 5 is closed, the loading motor drive circuit control signal 10 is output from the CPU 9, and the loading motor shown in FIG. 18 to start inserting the disk 16. CPU9 at the same time
The main power switch control signal 15 is output from the main power switch control signal 15. Then, the disk 16 is inserted, but if the accessory switch 3 is turned off during the insertion operation, the output of the AND circuit 6 becomes "L", but the power supply for the CPU 9 is taken from the battery power supply 1 via the regulator 2. The CPU 9 can operate at all times.
Power for the disc player circuit, loading motor drive circuit 11, etc. is taken from the battery power supply 1 via the main power switch 7 and from the output of the regulator 8. The main power switch 7 is closed when the output of the AND circuit 6 is "H". In other words, the accessory switch 3 closes and the output of the regulator 4 becomes "H".
and the door switch 5 is closed when it is on (state of "H"). Therefore, when the accessory switch 3 is turned off, or when the disk 16 is removed and the door switch 5 is turned off, the main power switch 7 is turned off, thereby reducing power consumption.

Switches 12 and 13 are respectively
This is for detecting the end position of disk ejection and the end position of disk insertion, and is composed of a photo sensor and the like. Switches 12 and 13 for detecting the end positions of insertion and ejection of these disks are
It is provided at the position shown in the figure which schematically shows the deck part in the figure. In FIG. 2, reference numeral 16 denotes a disk, the insertion end position of which is shown by a solid line, and the ejection end position of which is shown by a dotted line. Further, numeral 17 is a roller for inserting and ejecting the disk 16, which is driven by a loading motor 18, and rotates forward and backward depending on the insertion and ejection. The CPU 9 determines when the insertion of the disk 16 is finished based on the signal from the switch 13 when the detection switch 13 is cut off by the disk 16, stops the loading motor drive circuit control signal 10, and stops the rotation of the loading motor 18. and at the same time set the main power switch control signal 15 to "L".
On the other hand, the CPU 9 determines the end of ejecting the disk 16 based on the signal of the switch 12 when the detection switch 12 is cut off by the disk 16, and stops the loading motor drive circuit control signal 10 to load the ejector. The rotation of the turning motor 18 is stopped, and at the same time, the main power switch control signal 15 is set to "L".

Therefore, if the accessory switch 3 is turned off during the operation of inserting the disk 16, the output of the AND circuit 6 will be "L", but the main output from the CPU 9 during the operation of inserting and ejecting the disk 16 until the completion of the operation is The output of the OR circuit 14 is set to "H" by the power switch control signal 15, the main power switch 7 remains on, and the insertion operation is interrupted until the insertion of the disk 16 is completed.

Furthermore, even if the accessory switch 3 is turned off during the ejection operation of the disk 16, the ejection operation is continued intermittently until the ejection of the disk 16 is completed, in the same manner as the insertion operation described above.

(Effects of the Invention) As described above, according to the present invention, disk insertion,
Even if the accessory switch is turned off during the ejection operation, the disk will be completely inserted and ejected. Therefore, as before, when the disk is inserted,
This prevents the disk from stopping during ejection and becoming impossible to take out, and prevents the disk from being damaged by the door opening/closing mechanism of the deck.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of an embodiment of the present invention, Fig. 2 is a schematic diagram of a deck section, Fig. 1a is a plan view, and Fig. 2b is a plan view.
3 is a longitudinal sectional view, and FIG. 3 is a power supply control circuit diagram of a conventional audio disc player. 3... Accessory switch, 5... Door switch, 6... AND circuit, 7... Main power switch,
9...CPU, 11...Loading motor drive circuit, 14...OR circuit, 15...Main power switch control signal.

Claims (1)

[Scope of Claims] 1. A loading motor drive circuit for inserting or ejecting a disk; A main power switch for controlling the connection between the loading motor drive circuit and a power supply; An accessory switch and a deck section of an automobile. an AND circuit that outputs a main power switch control signal when the door switch of the deck is closed; a disk detection means that detects whether or not the operation of inserting or ejecting the disk into the deck section is completed; a central processing unit that continues to output a main power switch control signal until the completion of the disk insertion or ejection operation is detected; and when the main power switch control signal is input from the AND circuit and the central processing unit, the main power switch A power supply control circuit for an on-vehicle audio disc player, comprising an OR circuit that energizes the loading motor drive circuit when a power switch is closed.