JPS6079545A - Auto-stop detecting device - Google Patents

Abstract

PURPOSE:To detect in a short time a running stop of a tape at the time of a fast mode without generating an erronous detection at the time of a play mode, by setting a deciding time for deciding generation and non-generation of a tape counter pulse, in accordance with the play mode and the fast mode. CONSTITUTION:A driving circuit 11 inputs a mode selecting signal outputted in accordance with an operation of various operating buttons of quick travering, rewinding, stop, etc., and an auto-stop signal ASP from an auto-stop timer 10, outputs various driving signals in accordance with those input signals, and drives a motor mechanism part for driving to rotate reel bases 5, 6. Also, this driving circuit 11 is used as a deciding time setting means, too, discriminates a mode selected basing on the mode selecting signal, outputs a play mode deciding time setting signal PMS to the auto-stop timer 10 when the play mode is selected, and outputs a fast mode deciding time setting signal FMS to the auto- stop timer 10 when the fast mode such as quick travering and rewinding modes, etc. is selected.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an auto-stop detection device for detecting a stoppage of a tape-shaped information recording medium in an information recording/reproducing device or the like.

Asahi Miki 1 Generally, tape-shaped information recording media such as magnetic tape (
In an information recording/playback device such as a tape recorder that records information on a tape (hereinafter referred to as "tape") and plays back the information recorded on the tape, the tape is completely wound onto one of the reels. Equipped with an auto-stop detection device that detects when the tape has stopped running, in order to automatically switch to stop mode or reverse the running direction of the tape if it has an auto-reverse function. ing.

Conventionally, such an auto-stop detection device detects when a tape counter pulse generated in response to the running of the tape does not occur for a predetermined fixed judgment time, for example 3 seconds, that is, the state of the tape counter pulse changes within the judgment time. Not reversed (L"→゛H゛' or H"→゛L
''), it is determined that the tape has stopped running.

However, the running speed of the tape is, for example, play (P
LAY) mode, fast forward (F F) and rewind REV
) etc., the pulse interval of the tape counter pulse also changes depending on the mode.

That is, the tape running speed is slower in the play mode than in the first mode, and therefore the pulse interval of the tape counter pulse is longer in the play mode than in the first mode.

Therefore, if the determination time is set constant as in the conventional auto-stop detection device, false detection will occur in the play mode if the determination time is set according to the pulse interval of the tape counter pulse in the fast mode. In order to accurately detect the stoppage of tape running in the play mode, the determination time must be set to a time corresponding to the pulse interval of the tape counter pulse in the play mode.

Therefore, it takes the same amount of time to detect the tape running stop in the first mode as in the play mode, and there is a disadvantage that it is not possible to detect the tape running stop in a short time.

Purpose This invention has been made in view of the above points, and an object of the present invention is to make it possible to detect in a short time that the tape has stopped running in □ in fast mode without causing false detection in play mode. do.

l-Precept Therefore, the auto-stop detection device according to the present invention is
The determination time for determining whether a tape counter pulse occurs or not is set depending on the play mode and the first mode.

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

FIG. 1 is a block diagram showing one embodiment of the present invention.

First, the reel stand 5 drives the reel 6.4 on which the tape 2, which is the tape-shaped information recording medium of the cassette tape 1, is wound.
, 6, three identical blades 7 are attached to the outer peripheral surface of one of the reel stands 5 on the same circumference.

A photosensor 8 consisting of a light-emitting element, a light-receiving element, etc., which face each other with the blade 7 of the reel stand 5 in between, is provided.

This photosensor 8 outputs tape counter pulses TCP at pulse intervals corresponding to the running speed according to the rotation of the reel stand 5, that is, according to the running of the tape 2, and when the tape 2 stops running, i.e. When the reel stand 5 does not rotate, it continues in either the L'' or H'' state depending on the presence or absence of the blade 7.

On the other hand, the auto-stop timer 10 is a tape stop determining means, and is composed of a timer whose timer time can be set from the outside.

This auto-stop timer 10 inputs the tape counter pulse TCP from the photosensor 8.

It starts every time the tape counter pulse TCP rises and falls.

This auto-stop timer 10 receives a play mode determination time setting signal PMS from a drive circuit 11, which will be described later.
and the tape counter pulse TCP during the determination time set according to the first mode determination time setting signal FMS.
is not input, that is, when the state of the tape counter pulse TCP does not invert by the time the judgment time elapses after the start (when it does not change from H'' to ゛L'' or from °L'' to = H), the time-up occurs. It is determined that the tape 2 has stopped running, and an auto-stop signal ASP is output.

The drive circuit 11 is in a PLAY mode (not shown).

Fast forward (FF), rewind (REV), stop (STO)
It inputs the mode selection signal output in response to the operation of various operation buttons such as P) and the auto stop signal ASP from the O1-stop timer 10, and outputs various drive signals in response to these input signals. Then, mechanical parts such as motors that rotate the reel stands S and 6 are driven.

Further, this drive circuit 11 also serves as 1 judgment time setting means,
The selected mode is determined based on the mode selection signal, and when the play mode is selected, a play mode determination time setting signal F'MS is output to the auto-stop timer 10, and fast modes such as fast forward and rewind modes are selected. When the first mode determination time setting signal FMS is determined, the first mode determination time setting signal FMS is output to the auto-stop timer 10.

Next, the operation of this embodiment configured as described above will be explained with reference to FIGS. 2 and 3.

First, the determination time set in the auto-stop timer 10 will be described with reference to FIG.

The tape counter pulse TCP in play mode and fast mode is, for example, shown in FIGS. 2(a) and 2(b), respectively.
It becomes as shown in .

In this case, the duration time of H" or L" of the tape counter pulse TCP in the play mode is, for example, when three blades 7 are attached to generate the tape counter pulse TCP as described above. For cassette tapes, the maximum length is approximately 575m5ec.

Therefore, theoretically, the judgment time in play mode is 5
If you set it to a time slightly longer than 75n+sec, it will be possible to detect when the tape has stopped running, but taking into account deviations due to the type of tape and variations in mechanical parts, the time should be set to 2 to 3 sec.
It is desirable to set it to . In this example, 2 sec
Set to .

In addition, in the fast mode, the tape running speed is 1'O~30 times that in the play mode, so if it is set to 1, for example, 10 times, the determination time is 200111 seconds~
It may be set to 300u+sec. In this example, 2
Set to QOmsec.

Next, the operation of the drive circuit 11 will be described with reference to FIG.

First, the drive circuit 11 checks the input mode selection signal to determine whether the PLAY mode has been selected.

As a result of this determination, when the play mode is selected,
When the play mode judgment time is set in the auto stop timer 10, check whether the flag F1 is 1'' or not, and set the play mode judgment time in the auto stop timer 10. Determine whether it is set.

And if F1=1, auto stop timer 10
Output the play mode judgment time setting signal PMS to set the judgment time (25ec) when entering play mode 1, and
If 1'=1, the process moves directly to the next step.

As a result, if the state of the input tape counter pulse TCP is reversed during one of 2 seconds, which is the determination time, the auto stop timer 10 restarts from that point, and if it is not reversed, the time is up and the auto stop signal ASP Output.

On the other hand, if the result of the determination is that the play mode has not been selected, then it is determined whether the first mode has been selected.

When the first mode is selected, set the first mode judgment time in the O1-stop timer 10 (set it to "1").
It is checked whether the flag F2 is ``1'' or not, and it is determined whether the determination time for the first mode is set in the O1-stop timer 10.

And if F2=1, auto stop timer 10
The first mode determination time setting signal PMS is outputted to set the first mode determination time (200 msec), and if F2=1, the process directly advances to the next process.

As a result, if the state of the input tape counter pulse TCP is reversed within the judgment time of 20 seconds, the auto-stop timer 10 restarts from that point, and if it is not reversed, the auto-stop timer 10 times out and outputs the auto-stop signal ASP. Output.

Next, the drive circuit 11 checks whether or not the auto-stop signal ASP from the auto-stop timer 10 is input, and determines whether or not the running of the tape 2 has stopped (auto-stop). If it is auto-stop, for example, During auto play, a transition process to play mode is performed, and when an auto reverse function is provided, an auto stop process such as reversing the running direction of the tape 2 (FWD→REV, or REV-+FWD) is performed.

Note that when a stop mode other than the play mode and fast mode is selected, even if the auto stop signal ASP is input from the auto stop timer 10, it is ignored. In this case, auto stop timer 1
It is also possible to prevent 0 from operating.

In this way, in this auto-stop detection device,
Since the judgment time is set depending on the play mode and the first mode, the judgment time can be set according to the pulse interval of the tape counter pulse in each mode, and the judgment time can be set shorter in the first mode than in the play mode. Therefore, the time required to detect when the tape stops running in the first mode is shortened.

Thereby, it is possible to quickly shift from the first mode to another mode.

For example, when performing random access, the tape is first run in fast mode, the tape start position is checked using auto-stop, and the transition is made to the next mode. Access can be made quickly.

Furthermore, during auto play, the tape is moved to the start position in fast mode and the auto stop detection confirms the short start position before switching to play mode, but the detection time when the tape stops running is shortened.
Autoplay can be performed quickly.

Furthermore, in the fast mode, for example, even if the cassette tape reaches the end and the tape stops running, the reel motor for fast forwarding or rewinding continues to idle until this running stop is detected. By being able to detect this in a short time, the idling time of the reel motor can be shortened, and the load on one mechanical section can be reduced.

As explained above, according to the present invention, the automatic stop judgment time is set according to the mode, so false detection does not occur in play mode, and tape running is stopped in fast mode. Can be detected in a short time.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. 2 is a waveform diagram showing an example of the count pulse TCP shown in FIG. 1 during play-by-play and fast mode, and FIG. 3 is a flow chart showing an example of the operation of the drive circuit shown in FIG. 1. . 1...Cassette tape 2...Tape 5.6...
Reel stand 7...Blade 8...Photo sensor 10...Auto stop timer 11...Drive circuit

Claims (1)

[Claims] 1 O1 that detects the stoppage of the tape-shaped information recording medium
- In the stop detection device, the tape-shaped information recording medium stops when tape counter pulses that occur at time intervals according to the running speed of the tape-shaped information recording medium do not occur within a predetermined determination time. An auto-stop detection device comprising: a tape stop determining means for determining that running has stopped; and a determining time setting means for setting the determination time of the tape stop determining means depending on a play mode and a fast mode. .