JPS593736A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce the number of terminals by one and to reduce the size of a device, by inputting a cassette ejecting signal to the same terminal of a microcomputer with a detection signal indicating the fact that a cassette is inserted up to a specific position of a holder. CONSTITUTION:The microcomputer 5 is provided with terminals 10-10 other than a terminal for ejection, and the common terminal 9 for an ejection switch 7 and a cassette detection switch 6 for detecting whether a cassette is inserted up to the specific position in the holder is provided. When the ejection switch 7 is turned on, an L-level signal is inputted to the terminal 9 and the microcomputer 5 controls the running of a magnetic tape and ejects the cassette. On the other hand, if the cassette is not inserted enough while the ejection switch 7 is off, the switch 6 is still on and the L-level signal is inputted to the terminal 9 to perform the ejection as mentioned above, but once the cassette is inserted up to the specific position, the switch 6 is turned off and an H-level signal is inputted to the terminal 9 to run the tape. Thus, the number of terminals is decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording/reproducing device that reduces the number of terminals used in a microcomputer.

In a magnetic recording/reproducing device using a cassette tape, which uses a microcomputer as a system control circuit to perform system control.

Conventionally, a method has been used in which the cassette holder does not operate unless it is lowered to a predetermined position. in this case,
A dedicated detection switch detects whether the cassette holder has been lowered to the specified position.

This was input to the dedicated terminal of the microconbeater.

On the other hand, the microcombi version of a conventional magnetic recording/reproducing device has a terminal for inputting a signal from a cassette eject switch (hereinafter referred to as an eject switch) for ejecting a cassette. There are eight terminals which are separate from the terminals to which the signal for detecting the set position of the cassette holder is input. Therefore, the number of pins of the microcombination unit is two to perform the above two functions.

In general, as microcombinators are used to increase the number of functions, the number of pins required increases, and reducing the number of bins by even one is a major challenge.・Requiring a large number of beans does not require a microconbeater with a large number of bins and a large capacity, and increases the area occupied by the microconbeater in a magnetic recording and reproducing device. The disadvantage was that it led to an increase in the price of

An object of the present invention is to eliminate the drawbacks of the prior art described above, and to reduce the number of terminals by using the terminals of the microconbeater in combination, thereby making it possible to use a microconbeater of a lower rank. An object of the present invention is to provide a magnetic recording/reproducing device that can perform the following functions.

The present invention inputs a cassette detection signal that detects that the cassette holder has been lowered to a predetermined position and an eject command signal of the operation button signals to the same input terminal of a microcomputer, so that the cassette holder is lowered to a predetermined position. When the cassette is not lowered to the position, the microcomputer terminal is forcibly brought into a state where the eject command signal is present by the cassette detection signal, thereby reducing the number of microcomputer terminals by one. shall be.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block diagram of the main parts of a magnetic recording and reproducing apparatus according to an embodiment of the present invention. In FIG. 1, 1 is a system control circuit (microcomputer), 2 is an eject command input circuit, 3 is a cassette detection circuit that detects whether the cassette holder has been lowered to a predetermined position, and 4 is a magnetic tape travel control circuit. shows. In this embodiment, the outputs of the eject command input circuit 2 and the cassette detection circuit 5 are input to one terminal A of the system control circuit 1.

In such a circuit, when an eject command is output from the eject command input circuit 2, the eject command signal α is input to the terminal A of the system control circuit 1. As a result, the system control circuit causes the magnetic tape running control circuit 4 to eject the magnetic tape. On the other hand, when the eject command signal α is not output and the cassette has not been lowered to the predetermined position, the same signal as the eject command signal is output from the cassette detection circuit 3, and this signal is output from the system control circuit 10. Input to input terminal A. Therefore, the running of the magnetic tape is controlled by the system control circuit 1 in the same way as when issuing an eject command. Furthermore, when there is no eject command and the cassette has been lowered to a predetermined position, no signal is input to the input terminal A and the magnetic tape continues to run.

FIG. 2 shows a specific example of the above embodiment. In the figure, 5
6 is a cassette detection switch that detects whether the cassette has been lowered to a predetermined position, 7 is an eject switch, 8 is an operation switch other than the eject switch, 9 is an eject microcomputer terminal , 10-digit microcomputer terminal other than for eject.

In this circuit, when the eject switch 7 is turned on, a low level signal is input to the eject terminal 9 to control the running of the microcomputer 5Vi magnetic tape and perform eject processing. On the other hand, when the eject switch 7 is off, if the cassette has not been lowered sufficiently and the cassette detection switch 6 is turned on, a LOW level signal is input to the eject microcomputer terminal 9, and the microcomputer 5 detects the magnetic tape as described above. controls the running of the motor and performs ejection processing. Next, when the eject switch 7 is off, when the cassette is lowered sufficiently and the cassette detection switch 6 is turned off, a high level signal is input to the eject microcomputer terminal 9, and the magnetic tape continues to run. .

Next, the operation of the microcomputer 5 in the circuit shown in FIG. 2 will be explained with reference to the flowchart shown in FIG. When the microcomputer 5 enters the switch input processing routine from the main routine for system control of the magnetic recording/reproducing device, it first inputs the signal α to the eject microcomputer terminal 9.
.

Determine whether h is an eject command signal (step S
1). If it is determined that the signal is an eject command signal, the process proceeds to step S2, where the running of the magnetic tape is controlled and eject processing is performed (step S2). After the eject processing is performed, the process returns to the main routine.

On the other hand, if it is determined in step S1 that the signals α and b are not eject command signals, it is determined whether a switch 8 other than the eject switch is pressed (step
55). If the switch is pressed, a change to the mode indicated by the switch is instructed (step S4). Then return to the main routine. Next, if no operation switch 8 other than the eject switch is pressed in step S3, the process of the microcomputer 5 immediately returns to the main routine.

As explained above, according to the present invention, the same input terminal of the microconbeater is used for both the cassette detection circuit output signal and the command signal from the eject switch, so the number of terminals used by the microconbeater is reduced to one. This has the great effect of reducing the number of items. Moreover, this makes it possible to use a low-rank, low-cost microconbeater.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the main parts of a magnetic recording and reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing a specific example of the above embodiment, and FIG. 5 is an explanatory diagram of the operation of FIG. 2. be. 1... System control circuit, 2... Eject command input circuit, 5... Cassette detection circuit. 4...Magnetic tape running control circuit, 5...Microcombi-rotor. 6...Cassette detection switch. 7...Eject switch. 1st @ 2nd mouth

Claims (1)

[Claims] 1. A magnetic recording and reproducing apparatus (with the above-mentioned A means is provided for inputting a cassette extension command signal and the cassette detection signal among the operation button signals to the same input terminal of the system control circuit, and when the cassette holder is not lowered to a predetermined position, the input signal is input to the same input terminal. 1. A magnetic recording and reproducing apparatus characterized in that a terminal is forcibly fixed in a state where a cassette ejecting command signal is present by the cassette detection signal regardless of the presence or absence of a cassette ejecting command signal.