JPH11353860A - Residual tape quantity detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a residual tape quantity detector which can calculate efficiently the residual quantity of tape. SOLUTION: At the time of record processing, the residual tape time of a feeding side reel 41a is calculated based on a recording time being set on an operating panel 20, a rotational period of the feeding side reel 41a detected at a sensor section 42, and a tape traveling speed. At the time of starting quick feed or rewinding, the residual tape time is updated every time when the r.p.m. of the feeding side reel 41a detected at the sensor section 42 reaches 10 and displayed on a CRT monitor 70 thus calculating the residual quantity of tape efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape remaining amount detecting device, and more particularly, to a tape remaining amount detecting device for detecting a tape remaining amount on a supply reel.

[0002]

2. Description of the Related Art As a conventional tape remaining amount detecting device, there is known a tape remaining amount detecting device applied to a tape remaining amount displaying device disclosed in Japanese Utility Model Application Laid-Open No. 62-101188.

This tape remaining amount detecting device measures the radius of a supply side reel when recording and reproducing operation while pressing a magnetic tape by a capstan and a pinch roller, and the magnetic tape is released from the pressed state and fast-forwarded. When performing the operation or the rewinding operation, the radius measured each time the supply-side reel makes one rotation is adjusted by the tape thickness, and the remaining amount of tape in the supply-side reel is calculated based on the radius.

In the above-described conventional tape remaining amount detecting device, the number of calculations is increased because the remaining tape amount of the supply reel is calculated each time the supply reel makes one revolution. The efficiency of calculating the remaining amount of tape was not good.

[0004] The present invention has been made in view of the above problems, and has as its object to provide a tape remaining amount detecting device capable of efficiently calculating the remaining tape amount.

[0005]

In order to achieve the above object, the invention according to claim 1 is directed to a magnetic tape having a thickness, a hub diameter of a supply reel, a rotation cycle of the supply reel, and the same supply reel. Tape remaining amount calculating means for calculating the remaining amount of tape on the same supply side reel when the recording / reproducing operation ends based on the tape running speed when rotating at the rotation cycle, and fast-forwarding after the upper recording re-operation is completed Reel rotation number detecting means for detecting the number of rotations of the supply reel after the start of the operation or rewinding operation; and Tape remaining amount updating means for updating the remaining tape amount calculated by the remaining tape amount calculating means is provided.

In the invention according to the first aspect, when the recording / reproducing operation is completed, the tape remaining amount calculating means determines the thickness of the magnetic tape and the hub diameter of the supply reel as the same as the supply side. The remaining tape amount in the supply-side reel is calculated based on the rotation cycle of the reel and the tape traveling speed when the supply-side reel rotates in the same rotation cycle. Then, when the fast forward operation or the rewind operation is started,
The reel rotation number detecting means detects the rotation number of the supply reel after the fast-forward operation or the rewind operation is started. Then, the tape remaining amount updating means,
The tape remaining amount calculated by the tape remaining amount calculating unit is updated for each of a plurality of rotation speeds based on the rotation number detected by the reel rotation number detecting unit.

The tape remaining amount calculating means is based on the thickness of the magnetic tape, the hub diameter of the supply side reel, the rotation cycle of the supply side reel, and the tape running speed when the supply side reel rotates at the same rotation cycle. It is only necessary to be able to calculate the remaining amount of tape on the same supply side reel when the recording / reproducing operation ends, and it is also possible to calculate the remaining amount of tape immediately before the fast-forward operation or the rewind operation is started. Alternatively, if the recording / reproducing operation is stopped and then the fast-forward operation or the rewinding operation is started, the remaining tape at the end of the recording / reproducing operation before the stop may be calculated.

The reel rotation number detecting means only needs to detect the rotation number of the supply side reel after the upper recording re-operation is completed and the fast forward operation or the rewind operation is started. May be the number of actual rotations of this supply side reel, or when switching to the rewind operation during the fast-forward operation or switching to the fast-forward operation during the rewind operation, The number obtained by subtracting the number of rotations may be used.

As an example of the configuration of the reel rotation number detecting means in the latter case, the invention according to claim 2 is a tape remaining amount detecting device according to claim 1, wherein the tape remaining amount detecting device according to claim 1 is a tape remaining amount detecting device. In the amount detecting device, when the reel rotation number detecting means changes from the fast-forward operation to the rewinding operation or when the rewinding operation changes to the fast-forwarding operation, the reel rotation number at each operation is subtracted and the reel rotation number is detected. The number of rotations of the side reel is detected.

In the invention according to claim 2, the reel rotation detecting means is provided when the user changes the operation from the fast-forward operation to the rewind operation, or when the user changes the operation from the rewind operation to the fast-forward operation. Detects the rotation speed of the supply-side reel by subtracting the rotation speed of the reel in each operation. That is, for example, when the supply-side reel rotates 10 times in the forward direction from a certain position, when the supply-side reel rotates 5 times in the reverse direction during the rewinding operation, and changes 15 times in the forward direction during the fast-forward operation, Detected as having made 10 rotations in the forward direction.

The tape remaining amount updating means updates the tape remaining amount calculated by the tape remaining amount calculating means for each of a plurality of rotations based on the number of rotations detected by the reel rotation number detecting means. For example, the amount of change in the radius of the supply side reel obtained by multiplying the number of rotations by the thickness of the magnetic tape is used as the supply side when the remaining tape amount is calculated by the remaining tape amount calculating means. Includes a method for updating the remaining amount of tape by adjusting the radius of the reel.

The remaining tape amount may be the length of the magnetic tape or a tape time corresponding to this length, and is an example of the configuration of the remaining tape amount updating means in the latter case. According to a third aspect of the present invention, in the tape remaining amount detecting device according to any one of the first and second aspects, the tape remaining amount updating means determines the updated remaining amount of the tape by the tape traveling speed. Then, the remaining time corresponding to the magnetic tape left on the supply-side reel is calculated.

[0013] In the invention according to claim 3 configured as described above, the tape remaining amount updating means updates the tape remaining amount calculated by the tape remaining amount calculating means, and updates the tape remaining amount to the tape remaining amount. The remaining time corresponding to the magnetic tape remaining on the supply side reel is calculated by dividing by the traveling speed.

Further, the tape remaining amount updating means displays the calculated remaining time on a display device arranged on the operation panel of the VCR, or displays it together with a video image on a CRT monitor connected to the VCR. And the like. As an example of the configuration of the tape remaining amount updating means in this case, the invention according to claim 4 is the tape remaining amount detecting device according to claim 3, wherein the tape remaining amount updating means determines the calculated remaining time. The configuration includes on-screen display means for displaying.

[0015] In the invention according to claim 4 configured as described above, the on-screen display means displays the calculated remaining time.

According to a fifth aspect of the present invention, there is provided a tape as claimed in any one of the first to fourth aspects, as an example of the configuration of the tape remaining amount updating means when another additional function is provided. In the remaining amount detecting device, the tape remaining amount updating means is configured to stop the running of the magnetic tape at a desired tape position based on the updated tape remaining amount.

In the invention according to claim 5 configured as described above, when the user sets a desired tape position, the tape remaining amount updating means sets the desired tape position based on the updated tape remaining amount. The running of the magnetic tape is stopped at the set tape position.

[0018]

As described above, according to the present invention, it is not necessary to calculate the remaining amount of tape every time the supply reel rotates, unlike the prior art. A remaining amount detection device can be provided.

According to the second aspect of the present invention, when performing the fast-forward operation and the rewinding operation continuously, it is not necessary to detect the rotational speed for each of them, so that the rotational speed can be detected efficiently. it can.

Further, according to the third aspect of the present invention,
The updated tape remaining amount can be provided on a scale that is easy for the user to understand.

Further, according to the invention according to claim 4,
The user can watch the remaining time on the magnetic tape along with the video image.

Further, according to the invention of claim 5,
The user can perform a fast-forward operation or a rewind operation to a desired tape position.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a video deck according to an embodiment of the present invention.

The video deck 10 has an operation panel 20 for inputting desired tape operation, information on the video tape, and the like.
A signal processing circuit 30 for processing a television broadcast wave received via an antenna 30a to output a video recording signal and for processing a video recording signal read from a video tape to output a composite signal; A tape mechanism 40 for running a video tape in response to an input operation on the panel 20 to perform recording / reproducing of a video recording signal, and an on-screen display (OS) in which a predetermined display is superimposed on a primary color driving signal by a signal processing circuit 30
D) A circuit 50 and a system controller 60 for controlling the entire video deck 10 are provided.

With this configuration, the user operates the operation panel 2
When a desired input operation is performed at 0, the corresponding operation information is detected by the system controller 60. When the operation information corresponds to the recording process, when the signal processing circuit 30 outputs a video recording signal obtained by performing signal processing on the television broadcast radio wave received by the antenna 30a to the tape mechanism 40, the system controller 60 executes the tape mechanism. At 40, a recording process is performed. When the operation information corresponds to the reproduction processing, the system controller 60 reproduces the data by the tape mechanism 40, processes the video recording signal read from the video tape, and superimposes a predetermined display on the composite signal. Is output. The signal processing circuit 30 includes a CRT monitor 7.
0 is connected, and a video image based on the composite signal can be viewed on the CRT monitor 70.

The operation panel 20 includes a record / play button 21 and a fast forward / rewind button 22 which can be pressed. When the user presses each of the operation buttons 21 and 22, corresponding press information is output to the system controller 60. You.

The operation panel 20 has a recording time selection key 2 for selecting a recording time of a video tape to be used.
Before the user inserts the video tape cassette and performs various operations, the user may have, for example, 30 minutes, 60 minutes.
A corresponding recording time is selected and set from any of the recording times of minutes, 120 minutes, and 240 minutes. Since the information regarding the tape thickness of the corresponding video tape and the diameter of the hub of the supply reel is previously associated with these recording times in the manufacturing process of the VCR 10, the user simply inputs the corresponding recording time. By simply doing so, the tape thickness and the hub diameter of the supply-side reel are set. Also,
In the present embodiment, the above operations are performed using the operation panel 20, but these operations can be performed using a remote controller.

The signal processing circuit 30 includes a tuner, a signal system circuit, an RF converter, and the like (not shown), is connected to the antenna 30a, and controls these in an appropriate order in accordance with an instruction signal output from the system controller 60 to record. Signal processing at the time of reprocessing is performed.

The tape mechanism 40 includes a tape driving section 41 for performing tape running based on an instruction from the system controller, and a sensor section 42 for detecting a rotation state of a supply-side reel and a tape running state described later. The video tape is caused to travel while detecting the situation and the tape traveling situation, and recording / reproducing processing is performed by various heads (not shown).

As shown in FIG. 2, the tape driving unit 41
A supply reel 41a attached to and rotated on the inner diameter of the supply hub in the loaded video tape cassette, and the same direction as the supply reel 41a mounted on the inner diameter of the take-up hub in the video tape cassette. And a take-up reel 41b which rotates the reel 41b.

With this configuration, at the time of the recording / reproducing process, the video tape is sent out from the supply side hub and wound on the winding side hub, and the recording / reproducing process is executed by the head cylinder 43. Further, at the time of the fast-forward processing, the video tape is sent out from the supply-side hub and wound up on the winding-up hub. At the time of the rewinding processing, the video tape is sent out from the winding-up hub and wound up on the supply-side hub.

The sensor section 42 includes a rotation cycle detection sensor 42a for detecting the rotation cycle of the supply reel 41a, and a tape running speed detection sensor 42b for detecting the tape running speed.
And a rotation speed detection sensor 42c for detecting the rotation speed of the supply reel 41a.
The rotation cycle of 1a and the tape running speed are detected, and the rotation speed of the supply reel 41a is detected during the fast-forward processing or the rewind processing, and the detection result is output to the system controller 60.

The OSD circuit 50 is connected between the system controller 60 and the signal processing circuit 30. The OSD circuit 50 has a dot matrix form for RGB primary color drive signals output from the signal processing circuit 30 in response to an instruction from the system controller 60. Arbitrary video signals are superimposed and displayed on the CRT monitor 70.

The system controller 60 is connected with the operation panel 20 and the signal processing circuit 30 in addition to the tape mechanism 40 connected thereto, and controls these in an appropriate order to execute a video tape recording / reproducing process. .

FIG. 3 is a flowchart showing a procedure when the system controller 60 performs the remaining tape detection processing.
When recording / reproducing a video tape, "STOP M
It is confirmed that it is not "ODE" or "STILL / SLOW" (step S100), and "FF / RE"
"W MODE" (step S11).
0). Then, the sensor unit 42 detects the rotation cycle Ts of the supply side reel 41a and the tape traveling speed ν1 and acquires the detection result (step S120). When the detection result is obtained (step S120), the tape thickness and the supply based on the recording time set on the operation panel 20 The remaining tape time is calculated by combining these rotation cycles and the tape running speed with the hub diameter of the side reel 41a (step S).
130).

The procedure for calculating the remaining tape time will be described with reference to FIG. Since the radius R of the supply-side reel 41a is Ts · ν1 / 2 / 2π (Ts: rotation cycle [seconds] of the supply-side reel 41a, ν1: supply-side reel 41a
Tape running speed [mm /
Seconds]), the area S1 of the supply-side reel 41a is Ts2 · ν12
/ 4π. In addition, the diameter of the supply side hub (62 [mm] /
26 [mm]) as D, the radius r1 of the supply side hub
Is D / 2, so the area S2 of the supply hub portion is
π · D2 / 4. The remaining tape time (minutes) is $ (S1
/ TH) − (S2 / tH)｝ / 60 · ν2,
(TH: tape thickness [mm], ν2: tape running speed at the time of recording / reproducing process [mm / sec]) When each value is substituted, the remaining tape time (minute) = ｛(Ts2 · ν12 / 4π · tH) − ( π · D2
/ 4tH)｝ / 60 · ν2.

Here, when switching from the recording / reproducing process to the fast-forwarding process or the rewinding process, "F
F / REW MODE ”is confirmed. Since the remaining tape time has been calculated at the time of the recording / reproducing process, the rotation speed n of the supply-side reel 41a is reset (Step S).
150), and causes the sensor section 42 to start counting the number of revolutions n (step S160). And, when this rotational speed n is 1
When it reaches 0 (step S180), the remaining tape time is updated as follows using n = 10 (step S190). If MODE is changed during the counting of the number of revolutions n (step S170),
The counting is stopped halfway and the process returns to step S100. Further, since the rotation speed n = 10 is merely an example of the threshold value at the rotation speed n, the rotation speed is not limited to this value, and can be set by appropriately changing the numerical value.

When the supply reel 41a makes one rotation, the radius R changes by ± tH. Thus, when the supply reel 41a makes n rotations in the same direction, the radius R becomes Ts ・ ν1 / 2π ± tH ・ n.
Becomes Therefore, the remaining tape time (minutes) is ｛(Ts2 ·
ν12 / 4π · tH) − (π · D2 / 4tH) + π · tH · n
2 ± Ts · ν1 · n｝ / 60 · ν2. Note that the value is-during fast-forward processing and + during rewind processing.

When the fast-forward processing or the rewind processing is continued as it is, the rotation speed n of the supply reel 41a is reset (step S150), and when n = 10, the remaining tape time is updated again (step S150). Step S19
0). As described above, until the fast-forward processing or the rewind processing is canceled, the updating of the remaining tape time is repeated every time the supply-side reel 41a rotates ten times.

Accordingly, the operation panel 20 for setting the recording time in which the information relating to the tape thickness of the video tape and the hub diameter of the supply reel is set, and the supply reel 41a
Unit 42 for detecting the rotation cycle of the tape and the tape running speed of the supply-side reel 41a; the operation panel 20;
Supply side reel 41a based on each information obtained from
In this sense, the system controller 60 for calculating the remaining tape time in (1) constitutes the tape remaining amount calculating means according to the present invention.

A sensor unit 4 for detecting the rotation speed n of the supply-side reel 41a during the fast-forward processing or the rewind processing.
Reference numeral 2 in this sense constitutes a reel rotation speed detecting means according to the present invention.

Further, at the time of fast-forward processing or rewind processing, the number of revolutions n detected by the sensor unit 42 is 1
The system controller 60 that updates the remaining tape time calculated at the time of recording / reproducing processing every time it reaches 0 constitutes the tape remaining amount updating means according to the present invention in this sense.

In the present embodiment, the amount of tape remaining on the supply reel 41a is calculated as the remaining time, but at least how much video tape is stored in the supply reel 41a.
Since it is only necessary to know whether the video tape is wound on the supply reel 41a, the length of the video tape remaining on the supply reel 41a may be simply calculated.

Further, based on the calculated remaining tape time and remaining tape length, when the tape remaining amount set in advance on the operation panel 20 is reached, this fast-forward processing or rewind processing is performed. It is also possible to control to end.

Next, the operation of the video deck according to this embodiment will be described. The user loads a video tape cassette into the video deck 10 and selects and sets the video tape recording time to be used with the recording time selection key 23.
Then, when the recording / reproducing process is started by pressing down the recording / playback button 21, the sensor unit 42 detects the rotation cycle Ts of the supply reel 41 a and the tape running speed ν 1 in accordance with an instruction from the system controller 60. The system controller 60 calculates the remaining tape time by adding the rotation cycle and the tape running speed to the tape thickness based on the recording time and the hub diameter of the supply-side reel 41a, and sends the remaining tape time to the OSD circuit 50. An instruction to display on the monitor 70 is given. Then, since a screen in which the remaining tape time is superimposed on the video image is displayed on the CRT monitor 70, the user performs recording / reproducing processing to a desired tape position while checking this screen.

Here, when the fast-forward / rewind button 22 is pressed down to start the fast-forward or rewind processing, the sensor section 42 detects the remaining tape time at the time of the recording / reproduction processing. Resets the rotation speed n of the supply-side reel 41a and starts counting the rotation speed n. Then, when this rotation speed n is 10
Is reached, the system controller 60 obtains this detection result, updates the remaining tape time, and instructs the OSD circuit 50 to display the remaining tape time on the CRT monitor 70 as in the recording / reproducing process. If the fast-forward processing or the rewinding processing is continued as it is, the updating of the remaining tape time is repeated every time the supply-side reel 41a rotates ten times until these processings are canceled. Then, the latest remaining tape time is displayed on the CRT monitor 70 each time the remaining tape time is updated, so that the user can fast-forward or rewind to a desired tape position while checking this screen. I do.

As described above, the recording time is set based on the recording time set on the operation panel 20, the rotation period Ts of the supply reel 41a detected by the sensor unit 42, and the tape running speed ν1 when performing the recording / reproducing process. When the fast-forward processing or the rewinding processing is started after calculating the remaining tape time on the side reel 41a, the remaining tape time is increased every time the rotation speed n of the supply-side reel 41a detected by the sensor unit 42 reaches 10. Since the updated tape is displayed on the CRT monitor 70, the remaining tape amount can be calculated efficiently.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of a video deck according to an embodiment.

FIG. 2 is a schematic diagram illustrating a schematic configuration of a tape driving unit.

FIG. 3 is a flowchart illustrating a procedure of a remaining tape time calculation process.

FIG. 4 is a schematic diagram illustrating a procedure for calculating a remaining tape time in a supply-side reel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Video deck 20 ... Operation panel 21 ... Recording / playback button 22 ... Fast forward / rewind button 23 ... Recording time selection key 30 ... Signal processing circuit 40 ... Tape mechanism 41 ... Tape drive part 41a ... Supply reel 41b ... Winding side Reel 42 ... Sensor part 42a ... Rotation cycle detection sensor 42b ... Tape running speed detection sensor 42c ... Rotation number detection sensor 50 ... OSD circuit 60 ... Syscon 70 ... CRT monitor

Claims (5)

[Claims] The recording / reproducing operation is performed based on a thickness of a magnetic tape, a hub diameter of a supply-side reel, a rotation cycle of the supply-side reel, and a tape traveling speed when the supply-side reel rotates at the same rotation cycle. A tape remaining amount calculating means for calculating a remaining tape amount in the same supply side reel at the time of ending, and a rotation number of the supply side reel after the upper recording re-operation is completed and a fast forward operation or a rewind operation is started. A reel rotation number detecting means for detecting, and a tape remaining amount for updating the tape remaining amount calculated by the tape remaining amount calculating means for each of a plurality of rotation numbers based on the rotation number detected by the reel rotation number detecting means. An apparatus for detecting a remaining amount of tape, comprising an updating unit. 2. The tape remaining amount detecting device according to claim 1, wherein the reel rotation number detecting means changes from a fast-forward operation to a rewind operation, or changes from a rewind operation to a fast-forward operation. A tape remaining amount detecting device for detecting the number of rotations of the supply-side reel by subtracting the number of rotations of the reel in each operation. 3. The tape remaining amount detecting device according to claim 1, wherein the tape remaining amount updating unit divides the updated tape remaining amount by a tape traveling speed to supply the tape. A remaining tape amount detecting device for calculating a remaining time corresponding to a magnetic tape left on a side reel. 4. The tape remaining amount detecting device according to claim 3, wherein said tape remaining amount updating means includes an on-screen display means for displaying the calculated remaining time. Detection device. 5. The tape remaining amount detecting device according to claim 1, wherein the tape remaining amount updating unit is configured to perform the magnetic recording at a desired tape position based on the updated tape remaining amount. A tape remaining amount detecting device for stopping running of a tape.