JPS5880158A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To decrease the number of terminals which are used to a microcomputer, by combined-using the same input terminals of the microcomputer, for both the output signal of a cassette detecting circuit and the command signal supplied from a stop switch. CONSTITUTION:The stop command signal (a) delivered from a stop command input circuit 2 is fed to a terminal A of a control circuit 1. Thus the circuit 1 stops the running of a magnetic tape. In case a cassette is not set at a prescribed lower position when no signal (a) is delivered, the signal (b) given from a cassette detecting circuit 3 is fed to an input terminal A of the circuit 1. As a result, the running of the magnetic tape is also stopped by the control 1.

Description

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

In a magnetic recording/reproducing device using a T15 cassette tape, a method has been used in the past to control the system using a micro combinator as a system 111# circuit. . In this case, a dedicated detection switch detects whether or not the cassette holder has been lowered to a predetermined position, and this is input to a dedicated terminal of the micro combinator.

On the other hand, the micro combinator of the conventional magnetic recording 4 playback device has a terminal for inputting the signal from the stop switch that stops the running of the magnetic tape, and this terminal receives the signal for detecting the set position of the cassette holder. It was separate from the manual terminal. Therefore, two microcomputer bins were required to perform the above two II functions.

In general, as multi-function processing is progressed using one micro combination, the number of pins required increases, and reducing the number of bins by even one becomes a big problem2, but the above Requiring two pins for such a function causes the need for a microcombinator with a large number of bins and a large capacity, which increases the area occupied by the microcombiator in magnetic recording and reproducing devices and increases the need for magnetic recording and reproducing. This has the disadvantage of causing an increase in the price of the device.

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 a microcomputer, thereby making it possible to use a lower-rank "microcombinator". The object of the present invention is to provide a magnetic recording and 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 a stop command signal of the operation button signals to the same input terminal of a microcombination unit, so that the cassette holder is lowered to a predetermined position. When the cassette is not lowered to the position, the cassette detection signal forces the 1illll microcombinator terminal. It is characterized by a reduction.

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

FIG. 1 shows l! of a magnetic recording/reproducing apparatus according to an embodiment of the present invention. A block diagram of the section is shown. In FIG. 1, 1 is a system control circuit (microcomputer), 2 is a stop command input circuit, 6 is a cassette detection circuit that detects whether the cassette holder has been lowered to a predetermined position, and 4 is a magnetic tape running control circuit. shows. In this embodiment, the outputs of the stop command input circuit 2 and the cassette detection circuit 6 are configured to be input to one terminal of the system control circuit.

In such a circuit, when a stop command is output from the stop command input circuit 2, the stop command signal a is input to the terminal A of the system control circuit 1. As a result of this K, the system control circuit stops the running of the magnetic chip 1. On the other hand, when the stop command signal a is not output and the cassette has not been lowered to the predetermined position, the cassette detection circuit 6 outputs the same signal as the stop command signal K, and this signal is used by the system control circuit. [Input to input terminal A of 1.

Therefore, the running of the magnetic tape is stopped by the system control circuit IK in the same way as when the stop command is issued. moreover,
When there is no stop command and the cassette has been lowered to a predetermined position, no signal is input to the input terminal AIC, and the magnetic tape continues to run.

FIG. 2 shows a specific example of the above embodiment. In the figure, 5
is a microcomputer (hereinafter referred to as a microcomputer), 6 is a cassette detection switch that detects whether the cassette has lowered to a predetermined position, 7 is a stop switch, 8 is an operation switch other than the stop switch, and 9 is a stop microcomputer terminal,
10 is a microcomputer terminal other than for stopping.

When # is in this circuit and the stop switch 7 is turned on, the L
A level signal is input to the stop microcomputer terminal 9, and the microcomputer 5 stops the running of the magnetic tape. On the other hand, when the stop switch 7 is off, if the cassette has not been lowered sufficiently and the cassette detection switch 6 is turned on, an L level signal is manually input to the stop microcomputer terminal 9, and the microcomputer 5 Stop running the tape. Next, when the stop switch 7 is off, when the cassette is lowered sufficiently and the power detection switch 6 is turned off, an H level signal is input to the stop microcomputer terminal 9, and the magnetic tape stops running. Continued.

Komeyo 5K, in the above-mentioned specific example, a single microcomputer terminal can stop the running of the magnetic tape and control the magnetic i1e recording and reproducing device according to the setting trend of the cassettes.

Next, the operation of the microcomputer 5 in the N2TIJ circuit will be explained with reference to chart 70 in FIG.

When the microcomputer 5 enters the operation switch input processing routine from the main routine for system control of the magnetic recording/reproducing device, it first determines whether the signals a and b input to the stop microcomputer terminal 9 are stop command signals. (Step S1) When it is determined that it is a stop command signal,
Proceeding to step S2, the magnetic tape is stopped running (step 82). After the running stop processing is carried out, the process returns to the main routine.

- If it is determined in step S1 that the signals a and b are not stop command signals, it is determined whether any switch 8 other than the stop switch is pressed (step S3). if,
If the switch is pressed, transformation to the mode indicated by the switch is instructed (step 84). After that, return to the main routine. Next, if no operation switch 8 other than the stop switch is pressed in step S3, the processing of the microcomputer 5 immediately returns to the main routine.

As explained above, according to the present invention, the same input terminal of the microcombiator is used for both the cassette detection circuit output signal and the command signal from the stop switch, so the number of terminals used by the microcombiator is reduced to one. This has the great effect of reducing the number of items. Moreover, for this reason, it becomes possible to use a lower-rank, lower-cost 11-chrome beater.

[Brief explanation of the drawing]

Is Figure 1 an implementation of the present invention? A block diagram of the main parts of a magnetic interconnection reproducing device using IK, FIG. 2 is a circuit diagram showing an example of the above embodiment, and FIG. 3 is a flowchart explaining the operation of FIG. 2. 1. System control Circuit, 2...Stop command input circuit, S...Cassette detection path, 4...Magnetic tape running control circuit, 5...Micro combiator, 6...Cassette detection switch, 7... Stop
Switch Representative Patent Attorney Michi Hiraki Talent 1 figure 31! 1 22 figure 0 -8 1 .

Claims (1)

[Claims] (1) A system unit that includes means for detecting that the cassette holder has been lowered to a predetermined position, and receives the detected cassette detection signal and operation button signal as input. The magnetic recording and reproducing device has a means for inputting a stop command signal of the operation output signal 8i and the power detection signal to the same input terminal of the system allocation circuit, When the cassette holder is not lowered to the specified position, the cassette detection signal M is used to forcibly fix the state mK with the stop command signal present, regardless of the presence or absence of the stop command signal at the st university input terminal. A magnetic recording and reproducing device that records images.