JPS5837630B2 - Tape recorder counter device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a counter device for a tape recorder that counts and displays the amount of tape travel in a tape recorder.

Recently, electronic digital counters that use a liquid crystal (or LED) display panel have been put into practical use as a counter device for counting and displaying the amount of tape running in tape recorders. In addition to displaying counts, it is being considered that other functions such as a clock, stopwatch, and timer may be added and the display may also serve as a display.

By the way, such a multi-functional counter device counts pulses proportional to the amount of tape travel, and even when this is displayed digitally, the internal circuit not only counts the amount of tape travel, but also displays clock information. Calculations for other functions such as counting operations to obtain the data are performed at the same time.

Therefore, if an extremely high-speed count pulse is applied, this pulse may be input while controlling other functions and cause malfunction.

Therefore, when the calculation time of the counter device is Tt, the relationship between the count pulse and the pulse-to-pulse time Tp must always be Tp>Tt, as shown in FIGS. 1a and 1b.

Therefore, in conventional tape recorders using such a counter device, consideration has been given to prevent the counter device from malfunctioning even when count pulses are output at high speed, that is, when the tape running speed is at its highest such as when rewinding the tape. Generally, one pulse is generated for each rotation of the tape take-up shaft or the tape delivery shaft.

By the way, recently, the tape speed of micro cassette tape recorder (product name) is 1. Ultra-low speeds of 2 crrt/see have appeared.

In this case, the number of rotations of the take-up reel is set to 27 mm, which is the maximum tape winding diameter of the microcassette, and the take-up reel rotates once every 7 seconds.

Therefore, in such a case, it takes 7 seconds for the take-up shaft to rotate once and generate one pulse, so it takes too long for the counter display to change, making it difficult to determine whether the tape is running or not. This may cause undue anxiety to the user.

This invention has been made in view of the above circumstances, and by frequently changing the display of the counter display according to the amount of tape running, it is possible to easily judge whether or not the tape is running from the change in the counter display. An object of the present invention is to provide a counter device for a tape recorder which can eliminate concerns of users.

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

FIG. 2 shows a tape recorder to which the present invention is applied.

In the figure, 1 is a tape recorder main body, and this main body 1 has a cassette loading section 2 and a speaker 3 on the front side, and has an RFC button 4, a PLAY button 5, and a STOP button 6 on one side, respectively.

Further, a liquid crystal (or LE) is provided below the cassette loading section 2.
A counter display section 7 using D) is provided.

This display section 7 is designed to digitally display the running distance of the tape.

Note that 8 in the figure is an operation button for other functions such as a clock, a stopwatch timer, etc., which are added in addition to the tape counter function.

Next, a specific configuration of the present invention will be explained with reference to FIG.

In the figure, reference numeral 10 denotes a pulse oscillator, and this oscillator 10 detects the rotation of the take-up shaft (or delivery shaft) 11 of the tape recorder, and outputs one pulse every 1101 revolutions of the shaft.

This pulse oscillator 10 has an output terminal connected to a first changeover switch 12 .

This changeover switch 12 is operated according to the operation mode of the tape recorder, for example, PLAY or RF.
When the tape is running at a low speed as in case C, the switch is switched to the contact piece 12A side, and when the tape is running at a high speed like during REW, that is, rewinding, the switch is switched to the contact piece 12B side.

In addition, this changeover switch 12 has a contact piece 12A multiplied by m times the circuit 1.
3 to the human power terminal of the counter 14, and the contact piece 12B is directly connected to the input terminal of the counter 14.

The m multiplier circuit 13 converts the output pulses of the pulse oscillator 10 into m
After the output pulse is given, a predetermined number of pseudo pulses are generated until the next output pulse is obtained.

In this case, the multiple m of the m-times circuit 13 is the number of rotations of the shaft 110 when the tape is running at low speed.

When the shaft 110 rotation speed when the tape is running at high speed is N1, it is set to, for example, m when the tape is running at low speed.
The generation speed of the count pulses outputted through the doubler circuit 13 is made equal to the generation speed of the count pulses outputted from the pulse oscillator 10 when the tape runs at high speed.

Further, the counter 14 resets the count contents each time the operation mode is changed and starts the cassette from zero, and the counter 14 is configured to reset the count contents and start the cassette from zero each time the operation mode is changed. Each output pulse is counted.

A second changeover switch 15 is connected to the output terminal of the counter 14 .

This selector switch 15 is linked to the first selector switch 12, and when the switch 12 is on the contact piece 12A side, it is switched to the contact piece 15A side, and when the switch 12 is on the contact piece 12B side, it is switched to the contact piece 15A side. It is arranged so that it can be switched to the side 15B.

Further, this switching switch 15 connects the contact piece 15A directly to the decoder driver 16, and connects the contact piece 15B to the decoder driver 16 via the m-multiplying circuit 17.

The m-multiplying circuit 17 is exactly the same as the m-multiplying circuit 13 described above, and multiplies the count output of the counter 14 by m when the tape is running at high speed.

A counter display section 18 is connected to the decoder driver 16.

This display section 18 digitally displays the contents of the counter 14, and when the operation mode is REW, that is, when the tape is rewinded, a negative sign, for example, is added to the digital display.

According to such a counter device, if the PLAY button 5 of the tape recorder shown in FIG. 2 is pressed, the tape is running at a low speed in this case, so the changeover switch 12 is switched to the contact piece 12A side, and the switch 12 is switched to the contact piece 12A side. Changeover switch 15
is also switched to the contact piece 15A side.

When the tape starts running in this state and one pulse is output from the pulse oscillator 10 for each revolution of the shaft 11, this output pulse is applied to the m-multiplying circuit 13 via the contact piece 12A of the changeover switch 12.

The m-multiplying circuit 13 generates m-fold pseudo pulses every time the above output pulse is applied.

Therefore, in this case, if the oscillator 10
If n output pulses are generated, then m'n output pulses are generated from the m multiplier circuit 13, which are counted by the counter 14, and this count output is sent via the contact piece 15A side of the changeover switch 15. Direct decoder driver 16
and is digitally displayed on the counter display section 18.

From this, for example, if the tape speed is 1.2 cyn. /
See, it takes about 7 seconds for the shaft 11 to rotate once and generate one pulse at extremely low speed.Since the output pulses multiplied by m by the m multiplier circuit 13 are counted by the counter 14, now m = 7. In this case, the display on the display section 18 can be changed approximately every second, and the running of the tape can thus be easily confirmed.

Next, when the REW button (not shown) of the tape recorder shown in Fig. 2 is pressed to rewind the tape, the tape is running at high speed at this time, so the selector switch 12 is switched to the contact piece 12B side, and the switch 12 is switched to the contact piece 12B side. Then, the changeover switch 15 is also connected to the contact piece 1.
Switched to 5B side.

In this state, when the tape runs at high speed and one pulse is output from the pulse oscillator 10 for each rotation of the shaft 1101, this output pulse is directly applied to the counter 14 via the contact piece 12B of the changeover switch 12 and counted.

In this case, the force counter 14 is reset once to its previous contents and starts counting from zero.

Further, the output of this counter 14 is in turn given to the m-multiplying circuit 17 via the contact piece 15B side of the changeover switch 15.

The m-multiplying circuit 17 generates m pseudo pulses each time the counter output is given.

Therefore, in this case, if n output pulses are generated from the pulse oscillator 10 by the end of tape rewinding, m'n output pulses will be generated from the m multiplier circuit 17.
This is digitally displayed on the display section 18 via the decoder driver 16.

Incidentally, in this case, since the tape is rewound at high speed, the counter 14 counts more frequently.

Therefore, the tape running can be easily confirmed by the display change on the display section 18 at this time.

? In addition, the m-times circuit 17 multiplies m by the end of tape rewinding.
Since 'n output pulses are generated, the display of the actual running length of the tape can be made equal to the display of the tape running length during the above-mentioned PLAY running.

However, with this structure, even when the tape speed is extremely low, it is possible to easily determine whether or not the tape is running from the change in the counter display, thereby eliminating the user's concerns. This can greatly contribute to improving the stability of the tape recorder during use.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be implemented with appropriate modifications within the scope without changing the gist.

For example, in the above-described embodiment, the m-multiplying circuit 13 and the 170-multiplying number 1 have a 1-1 relationship, but the speed of the count pulse input to the counter 14 through the 1-multiplying circuit 13 is the cause of malfunction of the counter 14. It can be set arbitrarily as long as it does not change the display on the counter display section 18 frequently and as long as the display changes on the counter display section 18 frequently.

As described above, according to the present invention, it is possible to easily judge whether or not the tape is running from the change in the counter display by frequently changing the display on the counter display according to the amount of tape running, and it is possible to easily judge whether or not the tape is running based on the change in the counter display. It is possible to provide a counter device for a tape recorder that can eliminate concerns caused by people.

[Brief explanation of the drawing]

Fig. 1 is a diagram for explaining the characteristics of a commonly used counter device with added multi-functions, Fig. 2 is a perspective view of a tape recorder to which the present invention is applied, and Fig. 3 is an embodiment of the present invention. FIG. 1...Tape recorder body, 2...Cassette loading section, 3...Speaker, 4...
・REC button, 5...PLAY button, 6...
・STOP button, I---display section, 8------
Operation button, 10...Pulse oscillator, 11...
... Winding shaft, 12, 15 ...... Selector switch, 1
3, 17... m times circuit, 14... counter, 16... decoder driver 18...
...Display section.

Claims (1)

[Claims] 1 In a device that counts output pulses according to the amount of tape travel and digitally displays them on a counter display section, when the tape runs at a low speed, the output pulses m
Multiply it and input it to the counter, and digitally display it on the counter display section. Also, when the tape runs at high speed, input the output pulse as it is to the counter, multiply this counter output by m, and then display it on the counter display section. A counter device for a tape recorder, characterized in that a digital display is made.