KR940005845B1 - Tape remaining part detecting methoe for tape driver - Google Patents

Abstract

The detection method of tape leftover has five steps including the first step of putting the normal velocity of the tape into memory; the second step of sensing the tape velocity of the supply reel and the take up reel; the third step of calculating the total length of the tape by using the information in the memory; the fourth step of figuring out the thickness of the tape by using the information in the memory; the final step of computing the length of tape to be played by using the calculated thickness of the tape.

Description

Residual tape detection method of tape drive when thickness is not fixed

1 is a block diagram schematically showing the configuration of a tape remaining amount detection circuit of a conventional tape traveling apparatus.

2 is a block diagram schematically showing the configuration of the tape remaining amount detection circuit of the tape traveling apparatus according to the present invention.

3 is a flowchart showing a method for detecting the remaining amount of tape in the tape traveling apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

10: rotation period pulse amplification unit 40: calculation unit

50: display unit

The present invention relates to a method for detecting the remaining amount of tape in a tape drive device used in a system capable of recording and reproducing magnetic media. The present invention relates to a tape remaining amount detection method capable of calculating the remaining amount of tape from the battle area and the tape thickness information of the tape.

The configuration of a circuit applied to the conventional method for detecting the remaining amount of tape is shown in FIG.

In the same figure, a rotation cycle in which the supply reel and take up reel are inputted from the Hall element after the pulse A and the take up reel pulse B of the supply reel are input, respectively, and then amplified and output. The tape thickness information is detected by the pulse amplifier, the speed detecting unit 2 in which the speed information of the tape is detected by the signal C input from the recording time switch, and the signal D input from the remaining tape switch. A calculation unit 4 for receiving signals output from the thickness information detection unit 3, the reel circuit 1, the speed detection unit 2 and the thickness information detection unit 3, and calculating the remaining tape amount; And a display element 5 for displaying information of the remaining tape amount output from 4).

The conventional method for detecting the remaining amount of tape having such a configuration includes storing known information on the tape, that is, length and thickness, and radius of the reel hub, storing rotation period pulse information, and speed information; Calculating tape speed information through the information, and detecting the remaining tape amount from the calculated information.

Looking at the information of the tape actually applied to the above information card, there are various kinds of tapes such as 60 minutes, 100 minutes and 120 minutes. The 60-minute tape has a length of 125M, a thickness of 20 μm and a reel hub of 62 mm in diameter. The length of the 120 minute tape is 245M, the thickness is 20 μm and the diameter of the reel hub is 26 mm.

However, the conventional detection method has a problem in that the remaining amount of tape amount Tr cannot be accurately calculated when the tape moving speed is not known. It can be explained well in the following equation.

That is, Tr = Ts ₁ ² － [sec]

Where X is the tape speed [mm / sec], V is the tape travel speed [mm / sec], t is the tape thickness [mm], and γH is the reel hub radius [mm] (feed reel and take). Up reel radius is the same), Ts ₁ : Supply reel rotation period [sec], π: circumferential rate when tape feed speed is X · V.

In addition, X * V, V, t, (gamma) H are all the signs from which a value is known.

In the conventional method for detecting the remaining amount of tape by such a system, the rotation cycles Ts and Tt of the supply reel pulse A and the take-up reel pulse B input to the microprocessor 4, and the tape If any one of the speed information (X · V) and the thickness information (T) of the tape is input, the remaining amount of the tape cannot be detected, and if the tape and the thickness are not constant, an error in calculating the remaining amount of tape may occur. There was a problem.

The present invention is to solve such a problem, an object of the present invention is the speed information of the tape input from the recording time switching switch is unknown, even when the thickness of the tape is not constant, Thickness using the tape thickness information obtained from the entire rotation area of the supply reel pulse and the take-up reel pulse at a specific time, and the length of the tape, and the thickness of the tape obtained from the hub radius of the supply and take-up reel. It is an object of the present invention to provide a long-term detection method in which a residual amount of a tape that is not constant is detected.

A feature of the present invention for achieving the above object is a method for detecting the remaining amount of tape in a tape drive device, comprising: a first step of storing a tape speed (V) in a ROM during tape standard mode transfer; A second step of storing the supply reel rotation period Ts ₁ and the take-up reel rotation period Tt ₁ of the specific time obtained from the Hall element serving as a sensor in the ROM; A third step of calculating the entire area of the tape by using the information stored in the ROM in the first step and the second step; A fourth step of calculating a tape thickness by using the information stored in the ROM of the first step and the overall information calculated in the third step; The tape of the tape drive device when the thickness of the tape composed of the fifth step of detecting the remaining amount of the tape using the information stored in the ROM of the first and second steps and the information calculated in the third and fourth steps is not constant. The remaining amount detection method.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram schematically showing a circuit of the tape remaining amount detecting method applied to the present invention, and FIG. 3 is a flowchart for performing the tape remaining amount detecting method of the present invention. As shown in the figure, the supply reel pulse rotation period (Ts) and take-up pulse rotation detected by a Hall element acting as a sensor is a frequency generated signal (Frequence Generate) in proportion to the rotation of the capstan motor of a particular new The period Tt is input to the rotation period pulse amplifying unit 10, respectively.

Since the tape speed V is already known in the standard mode transfer of the tape, it is possible to calculate the combat zero area (So; total area of the tape + the area of two hubs) of the tape.

That is, the relation is So = (Ts ₁ ² + Tt ₁ ² ) [mm ² ]... … … … … … … … … … … … … … a

Here, V is a standard tape feed rate [mm / sec], XV is a tape feed rate [mm / sec] at a specific time, and Ts ₁ is a feed reel rotation period when the tape feed speed is X 占 V [ sec], Tt ₁ : Take-up reel rotation period [sec] when the tape feed speed is X · V, π: circumferential ratio, X · V knows the value.

In addition, since the tape warpage area So is obtained, the tape length Ls and the reel hub diameter γH can be obtained. Thus, the correction tape thickness t ₁ can be calculated by the following equation (b).

t ₁ = [Mm]. … … … … … … … … … … … … … … … … … … … … … … b

Therefore, the remaining tape amount Tγ when the tape feed rate V ₁ is unknown and the standard mode tape feed rate V is calculated by the following formula (C).

Tγ = (( -[Pi] [gamma] H ² ) [sec]. … … … … … … … … c

Here, Ts: feed reel rotation period [sec] when the tape feed rate is “V ₁ ”, Tt: take-up reel rotation period [sec] when the tape feed rate is “V ₁ ”.

As described above, when the tape feed rate (V ₁ ) is unknown, it is possible to accurately detect the remaining amount of tape by measuring the combat area of the tape and the thickness of the correction tape and the rotation period of the supply and take-up reel. It is a very advantageous detection method for correcting the error factor due to scattering of the tape thickness and accurately detecting the remaining tape amount.

Claims (3)

A tape remaining amount detection method of a tape drive, comprising: a first step of storing a tape speed (V) in a ROM during tape standard mode transfer; A second step of storing, in the ROM, a supply reel rotation period Ts ₁ and a take-up reel rotation period Tt ₁ of a specific time obtained from the Hall element serving as a sensor; A third step of calculating the entire area of the tape by using the information stored in the ROM in the first step and the second step; A fourth step of calculating a tape thickness by using the information stored in the ROM of the first step and the overall information calculated in the third step; The tape of the tape drive device when the thickness of the tape composed of the fifth step of detecting the remaining amount of the tape using the information stored in the ROM of the first and second steps and the information calculated in the third and fourth steps is not constant. Residual amount detection method. The method of claim 1, wherein the calculating of the tape total area So is performed as follows. So = (Ts ₁ ² + Tt / ₁ ² ) A method for detecting the remaining amount of tape in a tape drive device when the thickness of the tape is not constant. (Where X · V is the tape feed rate [mm / sec] at any specified time, Ts ₁ is the feed reel rotation period [sec] when the tape feed rate is X · V, and Tt ₁ is the tape feed rate Take-up reel rotation period [sec], π is the circumference. According to claim 1, wherein the remaining tape (Tγ) detecting step, Tγ = (( -ΠγH ²⁾ the tape remaining amount detecting method of a tape drive unit in a case where the thickness of the tape that is not constant, characterized in that detected by the. (V is the standard tape feed rate [mm / sec], t ₁ is the specified time, Tt is the take-up reel rotation period [sec] when the tape feed rate is “V ₁ ”, and Ts is the tape feed rate “V ₁ Feed reel rotation cycle [sec], γH is the reel hub radius [mm].