JPS5810236Y2 - Tape recorder tape running time display device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tape running time display device that temporally displays the amount of tape running in a tape recorder. The purpose is to be able to display one-on-one information on the display.

Conventionally, there are a few known tape recorders that can switch the tape speed in two or more steps during constant-speed tape running during recording, playback, etc., and that also use a time display counter in hours, minutes, and seconds as a tape counter. It was getting worse.

However, in this type of tape recorder, when the tape is running at a constant speed, the time displayed on the counter and the actual tape running time match only at one specific speed; for example, when the tape is running at a constant speed of 38 crrL// se
If the above times match when O, then 19cTL
/eC, the counter display time is 1 minute, the actual tape running time is 2 minutes, and when 9.5cIIL/AeC, the counter display time is 1 minute, the actual tape running time is 4 minutes.
The displayed time and the actual time did not have a one-to-one correspondence.

Being able to understand the amount of tape running in terms of time is very convenient when editing tape to produce a program of a predetermined length, but when the time displayed on the counter and the actual tape running time do not match. However, once this comes out, its convenience will be halved and its range of use will be limited.

Therefore, the present invention eliminates these conventional drawbacks and makes it possible to always have a one-to-one correspondence between the display time on the counter and the actual tape running time, no matter what the fixed tape running speed is. , one implementation f□ will be explained below with reference to the drawings.

FIG. 1 shows the external appearance of a tape recorder equipped with the tape running time display device of this embodiment, in which 1 is a supply reel, 2 is a take-up reel, 3aj3b is a guide roller, 4 is a capstan, 5a, 5b is a pinch roller, 6 is a magnetic head block, 7 is a magnetic tape, and 8 is a roller that is rotationally driven by the running force of the tape 70 as it runs.

The illustration is a recording. This shows the state when the tape is running at a constant speed during playback, etc., and the pinch roller 5 is connected to the capstan 4 via the tape 7.
aj 5b is pressed, and the tape 7 is run at a constant speed in the direction from reel 1 to reel 2 (or from reel 2 to reel 1 in the case of a reciprocating tape recorder) by the rotational force of cab stuff 40.

When the tape is running at high speed, such as during fast forwarding and rewinding, the pinch rollers 5a and 5b are separated from the capstan 4, and the tape 7 is fast forwarded and rewound by the winding force of the reel 2 or reel 1.

In any of the above cases, the roller 8 is rotated by directly receiving the running force of the tape.

The outer periphery of the roller 8 is designed to prevent slipping between the roller 8 and the tape 7.

As shown in FIG. 2, a rotating disk 10 having a plurality of equally spaced notches 9 on the outer periphery is attached to the rotating shaft 8a of the roller 8, and this disk 10 is integrated with the roller 8. It is configured to rotate.

11 and 12 are a light emitting element and a light receiving element arranged to face each other with the outer peripheral part of the rotating disk 10 in between;
As the disk rotates 100 times, the notch 9 is intermittently connected to the element 1.
1.12, and intermittently irradiates light from the light emitting element 11 onto the light receiving element 12.

Then, a pulse-like signal having a frequency corresponding to the running speed of the tape 7 is outputted from the light receiving element 12.

The output signal of this light receiving element is shaped and converted into a rectangular pulse wave, and then input to a reversible counter, so-called up/down counter 13, where the number of pulses is counted.

Since the reversible counter 13 is constituted by a sexagesimal counter, clock signals corresponding to hours, minutes, and seconds are outputted to its output terminal.

Note that the counter 13 performs an adding operation when the tape is running at a constant speed in the forward direction and when fast forwarding in that state, and when the tape is running at a constant speed in the reverse direction and fast forwarding in that state. When returning, the subtraction operation is automatically switched.

The clock signal output from the reversible counter 13 is input to the integration calculation circuit FN114.

This integration circuit 14 is 2n, such as 1x, 2x, 4x, etc.
(However, n = 0.1.2...) The multiplier is multiplied by switch 15 of switches 15 and 16, which are switched in conjunction with the operation of the tape constant speed running speed switch. It is carried out by

That is, when the switch 15 is switched to the 9.5 cm/sec two-degree deviation position, the speed is 1 times, 19 cr.
For IL/sec, double, 38 crrL/sec
It is configured so that the number increases by four times when .

The output clock signal of the reversible counter 13 is configured to have a one-to-one relationship with the actual tape running time when the constant tape running speed is 9.5 crIL/sec. The signal is a constant tape running speed of 19 cm/sec.

38 crIL/sec K also has a one-to-one relationship with the tape running time.

Therefore, if the output signal of the calculation circuit 14 is used to display the time on the digital display 17, this display time will match the actual tape running time regardless of whether the tape is running at a constant speed, and the tape will always be running at a constant speed. The time is changed by 1 count every 1 second.

The switch 16 is used to change the constant of a drive circuit 19 for changing the rotational speed of a capstan motor that rotationally drives the capstan 4.

, the calculation circuit 14 uses a microcomputer.

In the above embodiment, when the output clock signal of the counter 13 is made to match the tape running time at a tape speed of 38 crIL/sec, the calculation circuit 14 is multiplied by % at 1 g cm/sec, and becomes a month at 9.5 an/sec cv. Just do it like this.

3Bcr when matching g-tr at 19 cm/sec
rL, 2 times at 'sec, 1 at 9.5m/sec
．． /2 times.

As described above, according to the tape running time display device for a tape recorder of the present invention, it is possible to directly display the constant speed running time of the tape. Since it matches the running time, the user can use this display time to edit the tape without any worries, which is very convenient.

[Brief explanation of the drawing]

FIG. 1 is a front view of a reel-to-reel type tape recorder equipped with an embodiment of the device of the present invention, and FIG. 2 is a circuit diagram of the same. 8...Roller, 9...Notch, 10.
... Rotating disk, 11 ... Light emitting element, 12
...... Light receiving element, 13... Reversible counter, 14... Calculation circuit, 15.16...
Changeover switch, 17...display section.

Claims (1)

[Scope of utility model registration request] A rotating body that rotates in connection with tape running, a detection circuit that detects the number of rotations of this rotating body and outputs a signal with a frequency corresponding to the number of rotations, and an output signal from this detection circuit.
It is equipped with a calculation circuit for converting into a 0-base clock signal, a tape counter having an electrical configuration to which an output signal from the calculation circuit is applied and displaying the running time of the tape, and a switching means for switching the constant tape running speed. In conjunction with this switching means, the output signal frequency of the calculation circuit is multiplied by 2n (where n is an O1 integer and 1 fraction), and when the tape is running at a constant speed, the tape counter is displayed every second of the tape running time. A tape running time display device for a tape recorder, characterized in that the numbers change by one count.