JPS587517Y2 - tape counter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape counter for a tape recorder, and in particular, is intended to display the amount of tape travel using a digital display element.

Most conventional tape counters have mechanical display mechanisms that display the amount of tape travel by rotating a numerical gear using the rotational force of a rotating body that rotates in conjunction with tape travel.

Since this type of tape counter obtains the driving force for the display mechanism from the tape running system, there is a risk that the tape running will be adversely affected and the tape running speed will be disturbed.

Furthermore, since the rotational speed of the tape running system was constant, the display accuracy of the tape running amount, in other words, the rotational speed of the numerical gear when a unit length of tape was running was also constant.

Therefore, in the present invention, the pulses generated in connection with tape running are counted and displayed on a digital display element, and the display accuracy is improved by varying the period of the pulses using a frequency divider. It is configured so that it can be adjusted.

Hereinafter, a detailed description will be given with reference to embodiments shown in the drawings.

The figure shows a block diagram of a tape counter according to the present invention, which includes a pulse generating means 1 that generates pulses in connection with tape running, a frequency divider 2 that divides the pulse output from the pulse generating means 1, It consists of a counter 3 for counting the output of this frequency divider 2, and a display means 4 for displaying the output of this counter 3.

The pulse generating means 1 includes, for example, providing a plurality of through holes 6 in a rotary plate 5 that rotates in connection with tape running, and having a light emitting diode 7 and a phototransistor 8 face each other across the rotary plate 5. In response to the tape running, the phototransistor 8 is made conductive or non-conductive, and this signal is taken out by the load resistor 9 and amplified by the amplifier 10.
A well-known configuration that further shapes the waveform and extracts the pulse output may be used.

The frequency divider 2 that divides the pulse output frequency may be formed by connecting multiple flip-flop circuits (hereinafter referred to as FF circuits) in series, and the first FF circuit 2a outputs a frequency divided by 1/2. However, a 1/4 frequency divided output is obtained from the second FF circuit 2b, and a 1/8 frequency divided output is obtained from the third FF circuit 2c.

Appropriate one F-F among the outputs of these F-F circuits
Connect the output of the circuit to the following counter 3.

The counter 3 has a configuration in which four lo-based up/down counters 3a, 3b, 3c, and 3d are connected in series.

Reference numeral 11 indicates an up/down selector switch for the counter 3, which is preferably linked to the operation button of the tape recorder.

That is, the selector switch 11 and the operation button of the tape recorder are linked so that the counter 3 functions as an up counter when the playback button is operated, and as a down counter when the rewind button is operated. .

The contents of counter 1 are reset to O by reset switch 12.

The contents of the counter 3 are displayed numerically by the display means 4.

That is, the output of the counter 3 is sent to the decoders 4a, 4b, 4
After signal conversion at c and 4d, the digital display element 4
The number is displayed as a' * 4b' t 4c'14d'.

In addition, as a means for arbitrarily selecting one of the divided frequency outputs from the frequency divider and applying it to the counter, specifically, a separate switch is provided on the tape recorder main body,
The configuration may be such that the user can appropriately certify the division ratio as necessary.

As described above, the tape counter of the present invention includes a pulse generating means that generates pulses in connection with the running of the tape, and a pulse output from the pulse generating means that is frequency-divided at different frequency division ratios. a branching unit that outputs an output; a counter that receives and counts the output from the branching unit; and means for arbitrarily selecting and applying any one of the branched outputs from the branching unit to the counter; A display means for displaying the counting output of the counter, and the counting speed of the counter with respect to tape running per unit length is varied and displayed depending on which frequency division output is counted by the counter. Since the display accuracy of the tape running amount by means can be arbitrarily adjusted, the tape running amount can be displayed enlarged or reduced depending on the application.
For example, when performing tape editing, accurate tape editing can be achieved by applying a divided output with a small division ratio to the counter and improving the display accuracy (ie, enlarging the display).

In addition, when using a long tape, by applying a divided output with a large frequency division ratio to the counter, the tape can be run over the entire length of the tape without the displayed value reaching the maximum value while the tape is running. Since the amount of tape can be displayed, it can also be used as a tape counter for an open type tape recorder, which has a significantly different amount of tape than a compact cassette type, thereby increasing productivity.

Furthermore, the display accuracy of such a tape counter can be set in advance by the manufacturer, and the display accuracy can be varied depending on the model, which has a very high practical value.

[Brief explanation of drawings]

The drawing is a block diagram of a tape counter according to the present invention. 1 is a pulse generating means, 2 is a branching unit, 3 is a counter 4
is a display means.

Claims (1)

[Scope of utility model registration request] A pulse generating means that generates pulses in connection with tape running, a frequency divider that divides the pulse output from the pulse generating means at different division ratios and outputs different divided outputs, and the frequency divider. a counter that receives and counts the output from the
It comprises means for arbitrarily selecting and applying one of the divided outputs from the divider to the counter, and a display means for displaying the count output of the counter, The counting speed of the counter with respect to tape running per unit length is varied depending on which divided output is counted, and the accuracy of displaying the amount of tape running by the display means can be arbitrarily adjusted. Features a tape counter.