JPS59117771A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To detect accurately residual amount of tape of tape running state by generating a tape residual amount signal (CTL-B signal) in which the period of output is increased in the manner of arithmetic series by means of a tape residual amount signal generating circuit. CONSTITUTION:In an audio control head, a magnetic head 16 (CTL-B head 16) for tape residual amount signal recording and reproducing which records or reproduces the tape residual amount signal (CTL-B signal) is provided additionally at the side of a control head 15 in addition to an audio head 14 and the said head 15. In this case, the CTL-B signal outputted from a CTL-B signal generating circuit 18 is constituted that the pulse output period is increased in arithmetic series. Then, the tape running state such as tape residual amount, running time or the like is grasped accurately at the reproduction.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves winding a magnetic tape around a rotating head cylinder.
The present invention relates to a magnetic recording and reproducing apparatus for recording and reproducing signals on a magnetic tape, and particularly relates to a magnetic recording and reproducing apparatus having a tape remaining amount display function.

Conventionally, a tape counter method has been used as a means for determining the approximate remaining amount of magnetic tape. As an example of this system, as shown in FIG. 1, a pulley 2 transmits the rotation of a take-up reel 1 to a pulley 4 via a belt 3, and a gear 5 that is integrally formed with the pulley 4 rotates. The number of times is displayed on a mechanical counter 6.

Another example of the tape counter method is to make a hole in a part of the take-up reel and optically read the number of rotations using a photosensor.

In any case, the above tape counter method detects the number of rotations of the take-up reel.

However, there is a problem in that the remaining amount of tape is not proportional to the number of rotations of the take-up reel, and the remaining amount of tape itself cannot be detected.

The present invention has been made based on these problems, and its purpose is to provide a magnetic recording and reproducing device that can accurately detect tape running conditions such as remaining tape amount or running time, and display this information. It is in.

In order to achieve the above object, the present invention causes a tape remaining amount signal generating circuit to generate a tape remaining amount signal (hereinafter referred to as a CTL-B signal) whose output cycle increases in an arithmetic progression, and generates this signal using a magnetic A new magnetic head for recording the Qi 70 remaining amount signal is installed to magnetically record the control track on the tape, and during reproduction, the CTL reproduced from this magnetic head is
- Detects the tape running status such as the current remaining tape amount or running time of the magnetic tape based on the output cycle of the B signal,
It is characterized by displaying this.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 2 to 6. In addition, through the i-hi figure 6,
Identical parts will be given the same reference numerals and repeated explanation will be omitted.

The present invention can be applied to any type of loading mechanism, but in this embodiment, a case where it is applied to an M loading mechanism will be described.

FIG. 2 is a diagram showing the loading state by the M loading mechanism.

In the figure, 7 is a rotating head cylinder, 8 is a magnetic tape, 9 is an audio erase head, 10d is an audio control head Y, 1lf'1 is a cassette, 12 is a supply reel, and 13 is a take-up reel.

In this M coring system, a control signal (hereinafter referred to as C
The audio control head 1o shown in FIG. 2 is used to record and reproduce the TL-A signal.

Figures 3 and 4 show this audio control.
FIG. 3 is a diagram of O seen from the direction A in FIG. 2. That is, the audio control head 10 conventionally has only two, an audio head 14 and a control head 15 (hereinafter referred to as the CTL-A head 15), as shown in FIG. In this embodiment, as shown in FIG. 4, a tape remaining amount signal recording/reproducing magnetic head 16 (hereinafter referred to as CTL-B head 16) for newly recording and reproducing the CTL-B signal (tape remaining amount signal) is used. ) to the above C
It is arranged next to the TL-A head 15. This CTL-
The B head 16 can record at a different anomous angle from the CTL-A head 15, and its head gear rough 0 is C
It is formed at an angle ψ with respect to the TL-A head 15. And the CTL on the control track
-CTL in the recording pitch gap formed by the A head 15-
A B signal is formed.

FIG. 5 is a block diagram showing the electrical configuration of this embodiment.

In FIG. 5, if recording is to be performed from the beginning of the magnetic tape, first set the switch 17 to the R side and press the CTL
- Input the reset signal R to the B signal generation circuit 18.

As a result, the CTL-B signal generation circuit 18 is set to the initial state. The CTL-B signal outputted from the CTL-B signal generation circuit 18 is a gyrus-like signal whose period changes every moment. Tip 9: If the time from the first pulse to the second pulse output is, for example, '/10000 seconds, the time from the second pulse output to the third 7XO pulse output is 2710000 seconds, and the next 3/1 (3
)00 seconds, thereafter 4/10000 seconds, 5/l O000 seconds, etc. This is a type of signal whose pulse output period increases arithmetically.

This CTL-B signal is passed through the switch 17 to the CTL-B signal.
The CTL-B signal is supplied to the B head 16 and recorded on the control track of the magnetic tape 8.

FIG. 6 is a diagram showing the recording i4 turn of the CTL-B signal formed on the magnetic flux field.

In FIG. 6, 19td image recording track, 20 an audio track, 21 a control track, 22 an image recording trace formed on the image recording track 19, and 23 formed on the control track 21 soil. This is the CTL-B signal pattern.

As can be seen from the figure, the recording pitch of the CTL-B signal pattern 23 is Nol+i2H..., Noro,...,
i gradually becomes longer. The relationship between these i1~ is 2-1 and 13-12=14-13-.... -ノ.

-1=vo/10000 ・・・・・・・・・・・・
・It can be expressed as (1) (vo: tape running speed).

After the above-described recording is performed, when reproducing the data, the switch 17 in FIG. 5 is set to the P side. When the image is reproduced, the CTL-B signal recorded on the magnetic tape 8 is detected by the CTL-B head 16 and input to the amplifier 19 via the switch 17. At this time, the CTI recorded by the CTL-A head,
-A signal has a large azimuth loss, so it is difficult to detect.

After being amplified here, it becomes a rectangular wave in the waveform shaping circuit 20 and is transmitted to the CTL-B signal interval detection circuit 2. This CTL-B signal interval detection circuit 2 detects each pulse output cycle of the CTL-B signal.

Assume now that the detected period is m710000 seconds. Then, the information of the period m710000 seconds is CP
The signal is transmitted to the U determination circuit 22. This CPU determination circuit 22
The following calculation is performed.

t-Σ'/10000 ・・・・・・・・・・・・
(2)-1 That is, if the cycle at the time of detection is m/10000 seconds, the tape running state at that time, that is, the time elapsed since playback started from the beginning of the tape is given by equation (2).

Tape running status information outputted from the CPU determination circuit 22, ie, the calculation result t of the above equation (2), is supplied to the time indicator 23. In this way, the running time t from the beginning of the tape can be displayed on the time display section 23.

As described above, according to the present embodiment, by recording the CTL-B signal on the control track during recording, it is possible to control the running condition of the tape, for example, even when playing back from any location on the tape. , it is possible to accurately grasp the position where the tape is currently running.

In this embodiment, the running time from the beginning of the tape is displayed, but the running time is not particularly limited. For example, when a 120-minute tape is used, the CPU determination circuit 22 determines that t'=120x60. -Σ'/10000
(3) By calculating i=1, it is also possible to display the time remaining on the tape.

Needless to say.

However, it is not necessary to provide it at this particular location, but it may be placed anywhere as long as it can come into contact with the tape surface.

As described above, according to the present invention, CTL-B
By providing a head, the CTL-B signal (tape remaining amount signal) is recorded during recording, so magnetic recording allows accurate grasp of tape running conditions such as remaining tape amount and running time during playback. We can provide playback equipment.

[Brief explanation of drawings]

Figure 1 is a diagram showing the conventional tape counter mechanism that indicates the amount of remaining tape, Figure 2 is a diagram showing the loading state by the M loading mechanism, and Figure 3 is shown in Figure 2. A view of the conventional control head seen from part A, Figure 4'7'', Figure 6 is an implementation fil of the present invention.
71/Figure 4 shows the control head shown in Figure 3.
FIG. 5 is a block diagram showing the electrical configuration, and FIG. 6 is a diagram showing the recording pattern on the magnetic tape. 1.13... Take-up reel, 2, 4... Pulley, 3.
・Belt, 5...Gear, 6...Mechanical counter,
7... Rotating head cylinder, 8... Magnetic tape, 9...
...Audio erase head, 10...Audio control head, 11...Cassette, 12...Supply reel, 14...Audio head, 21...
Control rack, 22 ・Image recording trace, 23...
CTL-B signal noso turn. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 3 Figure 4 Figure 6 η ρIJ'2 h 14 15 No. 6 Procedural amendment Awape, Jyg19 s Commissioner of the Patent Office Kazuo Wakasugi 1, Display of the case Japanese Patent Application No. 57-232681 2, Name of the invention Magnetic recording and reproducing device 3, Person making the amendment Relationship to the case Patent applicant name (037) Olympus Optical Engineering Co., Ltd. 4, Agent address: Port of Tokyo 17th Mori Building 5, 26-5, Exit 1-chome, Toranomon-ku Contents of spontaneous curve ball 7 correction (1) Next to "Magnetic Chil" on page 5, line 19 of the specification
Insert "8". (2) “Auger hoist 19” on page 7, line 17 of the same book? "
Amplifier 24" is corrected. (3) “Waveform shaping (b) path 2” in the 7th mill, line 20 of the same book.
0" is corrected to "waveform shaping circuit 25." +41 ``Detection circuit 21J'' on page 7, line 17 and 2 of the same book is corrected to ``detection circuit 26.'' (5) Same book! 4.8 page, line 6, 'EA'J line 6-7
In the 13th line, "judgment circuit 22" is corrected to "judgment circuit 27". (6) "Time display section 23" in lines 14 to 15 and 16 of page 8 of the same book is corrected to "time display section 28." (7) “Control Track” with 119 lines in the same book
Insert J2Zj 'Y after. (8) "In the same book, page 9, lines 1, 2, 3, and 5,"
Insert "8" next to "Tape". (9) Correct “Judgment circuit 22” on page 9 of the same book to “Judgment circuit, ?7J.” (1υ) Insert “161” next to “CT L-B head” on page 9, line 15 of the same book. aυ l'-CTL-4 head on page 9, line 16 of the same book.
Insert "15" next to "15". Residence Please refer to the numbers [19J to 23] in Figure 5 of the drawing on the attached sheet (8
) as if it were not placed on the side.

Claims (1)

[Claims] In a magnetic recording and reproducing device that uses a tape loading mechanism to pull out a magnetic tape from a tape cassette, wind it around a rotating head drum at a predetermined angle, and record and reproduce signals.
A tape remaining amount signal generation circuit that outputs a tape remaining amount signal whose output cycle increases in an isogematic series, and a tape remaining amount signal outputted from this tape remaining amount signal generation circuit during recording on a control track of the magnetic tape. A magnetic head for recording and reproducing a tape remaining amount signal that magnetically records the tape remaining amount signal, and a tape running status such as the current remaining amount of the magnetic tape or running time based on the output cycle of the tape remaining amount signal reproduced from this magnetic head during playback. 1. A magnetic recording and reproducing apparatus comprising a calculation means for calculating information and a display means for displaying tape running status information output from the calculation means.