JPH0235364B2 - JIKIKAATORITSUJI * TEEPUNOHETSUDO * TATSUCHISEIGYOHOSHIKI - Google Patents

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention detects the lead level of a magnetic cartridge tape, moves the head forward or backward, and positions the head at a position where an optimum head touch can be obtained. This invention relates to a head touch control system for magnetic cartridge tapes.

[Prior art and problems]

FIG. 1 is a diagram showing a conventional cartridge tape and head. In FIG. 1, 1 indicates a cartridge tape, and 2 indicates a W/R (Write/Read) head. Conventionally, since the W/R head 2 is fixed, the head touch becomes unbalanced due to variations in the tape tension of the cartridge tape 1 itself, making it difficult to obtain the optimum head touch. Therefore, the read level fluctuates due to variations in the cartridge tape 1 and is not constant. Conventionally, such head touch defects have led to an increase in errors.

[Purpose of the invention]

The present invention solves the above problems, and is not affected by variations in tape tension, can always obtain an optimal head touch, can obtain a stable read level, and can reduce errors. It is an object of the present invention to provide a head touch control method for magnetic cartridge tape.

[Structure of the invention]

To this end, the magnetic cartridge tape head touch control method of the present invention detects the read level of the magnetic cartridge tape, moves the head forward or backward, and positions the head at a position where the optimum head touch can be obtained. A head touch control method for a magnetic cartridge tape to be controlled, which comprises an envelope detection means for amplifying the output of a read head and detecting an envelope, a first reference voltage, and a second reference lower than the first reference voltage. Voltage,
A comparison means for comparing the value of the envelope with the first reference voltage and the second reference voltage, a head moving mechanism for moving the head forward or backward relative to the cartridge tape, and a motor for moving the head moving mechanism. A head driving means for driving a head moving mechanism to be driven, and an arithmetic control means, and the arithmetic control means performs the above operation on the condition that the value of the envelope is higher than the first reference voltage in the comparison by the comparison means. The head is moved backward, and the head is brought forward on the condition that the value of the envelope is lower than the second reference voltage, and the value of the envelope is between the first reference voltage and the second reference voltage. The present invention is characterized in that the head driving means is configured to control the head driving means so that the head driving means is controlled such that

[Embodiments of the invention]

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

2 is a diagram showing one embodiment of the present invention, FIG. 3 is a diagram showing the read level after controlling the amount of head thrust by the head touch control method of the magnetic cartridge tape of the present invention, and FIG. FIG. 4 is a diagram showing an example of a head moving mechanism to which the present invention is applied. In the figure, 1 is the cartridge tape, 2 is the W/R head, 3 is the read amplifier, and 4 is the cartridge tape.
is an envelope detection circuit, 5 is a comparator, 6
is a microcomputer, 7 is a drive amplifier, 8 is a motor, 9 is a steel belt, 10 is a guide rail, 1
1 represents a solenoid, and 12 represents a spring.

In Figure 2, in lead amplifier 3, W/
The read head output of the R head is amplified, and the envelope detection circuit 4 outputs the amplified read head.
The envelope of the output of the head is detected. The envelope detection circuit 4 is specifically a peak hold circuit. In comparator 5,
The envelope value detected by the envelope detection circuit 4 is compared with a reference voltage and a reference voltage, and it is detected whether it is between the reference voltage and the reference voltage, or is larger or smaller than them.
The reference voltage and reference voltage are provided to improve the S/N ratio and to prevent saturation of the amplifier. The values of the reference voltage and the reference voltage are set so that the input voltage of the first stage amplifier falls within an optimal range. When the comparison result of the comparator 5 is sent to the input port, the microcomputer 6 determines in which direction and by how much the motor 8 should be driven, that is, it selects a head such that the envelope value falls between the reference voltages. This is a calculation control device that calculates the drive direction and drive amount of the motor 8 necessary to obtain a touch, and controls the drive amplifier 7 from the output port based on the results. The motor 8 is, for example, a pulse motor, and is driven by the output of the drive amplifier 7 to which a command is given from the output port of the microcomputer 6 . The rotation of the motor 8 moves the W/R head 2 forward or backward (arrow A' or B').
Note that it is not necessary to newly provide the microcomputer 6, and the existing microcomputer that controls the entire magnetic cartridge device can be used to control the head touch.

FIG. 3 shows the lead level obtained as a result of controlling head touch in accordance with the present invention.

FIG. 3a shows the case where the output of the read head is less than the reference voltage. In such a case, the microcomputer 6 sends a command to the drive amplifier 7 to bring the W/R head 2 forward based on the ratio result of the comparator 5, and the output of the read head is made equal to the reference voltage. Motor 8 until the value between
is driven. FIG. 3b shows the case where the output of the read head is greater than the reference voltage. In such a case, the microcomputer 6 sends a command to the drive amplifier 7 to lower the W/R head 2 based on the comparison result of the comparator 5, so that the output of the read head falls between the reference voltage and the reference voltage. The motor 8 is driven until the value is reached.

As the drive unit, a steel belt or a screw mechanism commonly used in floppy disks can be used, and FIG. 4 shows an example of a W/R head drive mechanism using a steel belt. In FIG. 4, a guide rail 10 is provided so that the W/R head 2 can move back and forth relative to the cartridge tape 1. A steel belt 9, a solenoid 11, etc. are provided on the stand on which the W/R head 2 is mounted. When the motor 8 rotates in the direction of arrow A or B, the steel belt 9 is driven in the direction of arrow A' or B', and therefore the table and the W/R head 2 mounted on the table also rotate in the direction of arrow A' or B'.
Move in direction B′. The solenoid 11 moves the W/R head 2 in the vertical direction (in the direction of arrow CD), and this movement causes the W/R head 2 to switch tracks.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, since the microcomputer can control the head back and forth while monitoring the envelope of the read level from the head, an optimal head touch can always be obtained and a stable lead can be obtained. - The level can be obtained, and errors can be reduced without being affected by individual variations in tape tension.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a conventional cartridge tape and head, and FIG. 2 is a diagram showing an embodiment of the present invention.
FIG. 3 is a diagram showing the read level after the head thrust amount is controlled by the head touch control method of the magnetic cartridge tape of the present invention, and FIG. 4 is a diagram showing one of the head movement mechanisms to which the present invention is applied. It is a figure which shows an example. DESCRIPTION OF SYMBOLS 1... Cartridge tape, 2... W/R head, 3... Read amplifier, 4... Envelope detection circuit, 5... Comparator, 6... Microcomputer, 7... Drive amplifier, 8... Motor, 9...Steel belt, 10...Guide rail, 1
1...Solenoid, 12...Spring.

Claims (1)

[Claims] 1. A magnetic cartridge tape head touch control system that detects the lead level of a magnetic cartridge tape, moves the head forward or backward, and controls the head position to a position where an optimal head touch can be obtained, envelope detection means for amplifying the output of the read head and detecting an envelope; a first reference voltage; a second reference voltage lower than the first reference voltage; a value of the envelope, the first reference voltage and the first reference voltage; 2, a head moving mechanism for moving the head forward or backward relative to the cartridge/tape, a head driving means having a motor for driving the head moving mechanism, and an arithmetic control means. The arithmetic control means moves the head backward on the condition that the envelope value is higher than the first reference voltage in the comparison by the comparison means, and determines that the envelope value is lower than the second reference voltage. The device is characterized in that the device is configured to control the head driving means so that the head is brought forward under the condition, and the value of the envelope is between the first reference voltage and the second reference voltage. Head touch control method for magnetic cartridge tape.