JPH0119280Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape counter device, and particularly to a tape counter device in an auto-reverse type tape playback device.

There is a so-called auto-reverse type tape playback device that is configured to be able to play the tape in both normal (NORMAL) and reverse (REVERSE) running directions, but such a device is equipped with a single tape counter. Therefore, the current position of the tape is confirmed using this one tape counter. Therefore, in order to know the remaining amount of tape or the amount of tape running, it is necessary for the user to check the running direction of the tape and make a judgment based on the contents of the tape counter, which is complicated and unbearable.

An object of the present invention is to provide a tape counter device that can easily determine the current tape position in an auto-reverse type tape player.

The tape counter device of the present invention has two independent tape counters, one for the forward running direction of the tape and one for the reverse running direction, and the contents of these two counters are selectively displayed depending on the running direction of the tape. It is characterized by what it did.

The present invention will be described below with reference to the accompanying drawings.

The figure is a schematic block diagram showing an embodiment of the present invention, and is provided with a rotation detector 1 for detecting the rotation of the reel stand, which includes a photodiode D ₁ , a phototransistor Q ₁ and resistors R ₁ and R _{2 .} It consists of
A reel stand (not shown) or a rotating plate that rotates accordingly is provided between the pair of light emitting and receiving elements, and the reel stand is connected to the output of the phototransistor _Q1 by forming a predetermined slit in the rotating plate. A pulse signal is generated in accordance with the rotation of the reel stand. This pulsed signal is shaped by a waveform shaper consisting of a Schmitt trigger circuit 2 and becomes the clock input of counters 3 and 4. The Schmitt trigger circuit 2 consists of inverters I ₁ , I ₂ and resistors.
It is composed of R ₃ and R ₄ .

The counter 3 is a tape counter for running the tape in the forward direction, and the other counter 4 is used as a tape counter for running in the reverse direction. The outputs of both counters 3 and 4 are input to a switching circuit 5 and are selectively selected, while being displayed as a count on a display circuit 6. Also, resetting both counters 3 and 4 is as follows:
By switching the reset command signal in the switching circuit 7, either one of the counters 3 and 4 can be operated independently.

When the counter stop command signal is switched by the switching circuit 8 and applied to either one of the counters 3 and 4, the counter stops of both counters can also be controlled independently. The up-down command for both counters is made by a command signal from the up-down command signal generation circuit 9, and this signal is applied directly to the forward direction counter 3 and also to the reverse direction counter 4 via the inverter _I3 . Ru. and a switching circuit 5 for each signal,
Each switching control of 7 and 8 is performed by switching control signal generation circuit 1.
It is configured to be performed by a control signal from 0.

Here, from the up-down command signal generation circuit 9
FF (fast forward), NORMAL PLAY (forward play)
By configuring the configuration so that an up command signal is generated when the up command signal is generated, and a down command signal is generated during RW (rewind) and REVERSE PLAY (reverse playback), the forward direction counter 3 is activated when the up command signal is generated. performs an up-count operation, and the reverse direction counter 4 performs a down-count operation. Further, when a down command signal is generated, the reverse direction counter 4 counts up, and the forward direction counter 3 counts down. Therefore, the counter 3 indicates the tape position when playing in the forward direction, and the other counter 4 indicates the tape position when playing in the reverse direction. By selectively selecting one and displaying it on the display circuit 6, it becomes possible to automatically check the tape position at each playback. Therefore, the switching control signal for the switching circuit 8 is FF,
The switching control signal generation circuit 10 generates a signal so that the output of the counter 3 is selected during NORMAL PLAY, and the output of the counter 4 is selected during RW and REVERSE PLAY.

Furthermore, counter 3 during FF, NORMAL PLAY
The reset and stop operations of RW,
A switching circuit 7 is provided so that the counter 4 can be reset and stopped at the time of REVERSE PLAY.
8 is configured to be controlled by a switching control signal.

As described above, according to the present invention, it is possible to display the tape position according to the playback in the forward and reverse directions in an auto-reverse tape player, so that the complexity required for confirming the tape position as in the past is eliminated. This is convenient.

[Brief explanation of drawings]

The figure is a block diagram showing an embodiment of the present invention. Explanation of symbols of main parts: 3, 4...Tape counter, 5...Counter output switching circuit, 6...Display circuit.

Claims (1)

[Scope of utility model registration request] A tape counter device for an auto-reverse type tape player configured to be able to play a tape in both forward and reverse running directions, comprising a tape counter for the forward running direction of the tape and a tape counter for the reverse running direction of the tape. , display means for selectively displaying the count contents of both tape counters according to the forward and reverse running directions, and the tape counter for the forward running direction is incremented when the tape is running in the forward direction, and when the tape is running in the reverse direction, The tape counter is configured to perform a count that is subtracted when the tape is running in the forward direction, and the tape counter for the reverse running direction is configured to perform a count that is subtracted when the tape is running in the forward direction and added when the tape is running in the reverse direction. Tape counter device.