WO1999028906A1 - Tape transport device - Google Patents

Tape transport device Download PDF

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Publication number
WO1999028906A1
WO1999028906A1 PCT/JP1998/005270 JP9805270W WO9928906A1 WO 1999028906 A1 WO1999028906 A1 WO 1999028906A1 JP 9805270 W JP9805270 W JP 9805270W WO 9928906 A1 WO9928906 A1 WO 9928906A1
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WO
WIPO (PCT)
Prior art keywords
tape
speed
radius
pack
motor
Prior art date
Application number
PCT/JP1998/005270
Other languages
French (fr)
Inventor
Katsunori Mochida
Original Assignee
Matsushita Electric Industrial Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Publication of WO1999028906A1 publication Critical patent/WO1999028906A1/en

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/46—Controlling, regulating, or indicating speed
    • G11B15/48—Starting; Accelerating; Decelerating; Arrangements preventing malfunction during drive change

Definitions

  • the present invention relates to a tape transport device mounted to a magnetic-recording-medium reproduction apparatus, such as a video cassette
  • improvements include: (a) spinning a motor at a higher speed for running a tape,
  • Fig. 4 is a block diagram illustrating a structure of this kind of tape transport
  • the tape transport device comprises the following elements: (a) a motor 101 for driving a tape;
  • motor 101 is transmitted to the reel via a belt or a gear to run the medium;
  • a speed sensor 104 that outputs a frequency
  • sensor 104 includes a magnetic resistive element (not shown, and hereinafter
  • an MR element that detects a polarity of the magnet (not shown)
  • a central processing unit (CPU) 151 outputs a signal responsive to a radius of
  • a D/A converter 152 that converts digital signals into analog signals
  • a controller 154 receives a frequency signal from the speed sensor 104, and
  • the tape speed changer 153 receives the output signal from the D/A converter
  • a rotation instruction signal which is to be supplied to a driver 111, responsive to the output from the D/A converter 152, thereby to change a running speed of the
  • the CPU 151 of conventional tape transport device gives the following
  • run-mode relies on a tape pack radius on the take up reel 102. In other words, when the tape pack radius is small, the speed-up rate is great, and when the tape
  • the tape runs at a target speed of the fast-run-mode, which includes a fast-search and the like, when the rotational speed is raised to a given speed.
  • slow-start type of operation-start
  • Fig. 3 illustrates rising characteristics of the rotational speed of motor 101.
  • the X-axis indicates the time-lapse after the motor 101 is started with the
  • the starting-status shown with the line 202 still has a slant
  • slow start mode allows redundancy in a fast-search mode or a fast-rewinding mode, which lowers an operating efficiency.
  • the present invention addresses the above problem and aims to provide a tape
  • the present invention judges a size of tape pack radius, and a fast-start is selected
  • This fast-start is referred to as a start-up mode where the tape running speed is
  • the tape transport device of the present invention comprises the following elements in order to realize the above objective:
  • target speed setting means for setting a target speed for the motor by
  • This structure enables the tape transport device to reduce a required time for
  • the fast-running operation such as the fast-search mode or fast-rewinding mode.
  • this structure restrains a load to the tape, which is produced when the
  • Fig. 1 is a block diagram illustrating a structure of a tape transport device
  • Fig. 2 is a flow chart depicting a software process in the tape transport device utilized in the exemplary embodiment of the present invention.
  • Fig. 3 is a chart illustrating a rising characteristic of a rotational speed.
  • Fig. 4 is a block diagram illustrating a structure of a conventional tape
  • the tape transport device shown in Fig. 1 includes the following elements: (a) a
  • a speed sensor 4 that outputs a frequency signal
  • the speed sensor 4 includes
  • MR magnetic resistive element
  • a tape-pack-radius detector 5 detects a tape-pack-radius on the take up reel 2
  • a fast-start target speed calculator 6 sets and outputs a target speed of the
  • speed calculator 7 sets a target speed of the motor 1 at a second speed, e.g. a
  • This target speed is progressively increased.
  • a tape-pack-radius comparator 8 receives the data including a predetermined
  • the comparator 8 Based on the comparison result, the comparator 8 then outputs a control signal for
  • a target speed settor 9 sets one of the output from the fast-start target speed
  • the speed controller 10 receives the rotational speed detected by the speed
  • the driver 11 rotates the motor 1 based
  • V is a tape running speed
  • T is a time for one rotation of take up reel 2.
  • the outer circumference of the reel is found as 27tR, where R is radius spanning
  • the rotational speed of take up reel 2 is detected with a slit punched on the reel,
  • the slit is detected by a photo sensor every time it passes by the photo sensor
  • the above calculation method employs a time for one rotation of the reel; however,
  • the tape-pack-radius can be
  • a slit can be provided on the motor 1,
  • a combination of a magnet and a MR element or a Hall element can be
  • V V 0 + T x ⁇ V
  • V 0 is an initial speed of the motor
  • T is a time lapse from the motor start based on the fast-run instruction
  • ⁇ V is a speed increase per one unit time
  • V is a target speed of the motor.
  • the speed controller 10 starts the motor 1 via the driver 11.
  • the tape-pack-radius detector 5 detects the tape pack radius on
  • the tape is desirably once played back before the instruction is given.
  • the tape-pack-radius is calculated.
  • the target speed settor 9 sets the output from the low-start target
  • speed settor 9 outputs the target speed to the speed controller 10 such that the rotational speed is increased progressively.
  • the speed controller 10 supplies the rotation instruction signal to the driver 11
  • the driver 11 rotates the motor 1 following the rotation instruction signal from
  • the take up reel 2 driven by the motor 1 takes up the tape
  • the fast-start is practiced when the tape pack radius is small.
  • the tape runs at a fixed and an accurate speed.
  • the tape pack radius on the take up reel 2 is
  • step 21 the reference tape-pack-radius is given.
  • step 22 the data of tape pack radius obtained in step 20 is compared
  • step 23 of fast-start target speed setting is selected, then the
  • target speed of motor 1 is set at the first speed, e.g. the highest possible speed of
  • the low-start target speed setting is selected in step 24, where the
  • target speed is set at the second speed, e.g. the initial speed is a rotational speed in the normal playback mode, and the speed is increased progressively.
  • step 25 the rotational speed detected by the speed sensor 4 is given.
  • step 26 the rotation instruction signal is supplied by using the rotational
  • This signal is utilized for rotating the motor 1 at the
  • step 25 a rotational
  • tape pack radius is not smaller than the reference tape-pack-radius, another "low
  • start target speed is set for starting the motor at a second speed that is progressively increased. Under this arrangement, the output from the speed
  • mentioned first speed is set at, e.g. the top rotational speed of the motor, and the
  • second speed is set at, e.g. the rotational speed of normal playback operation.
  • the motor starts in fast-start mode, thereby reducing the required time for fast-run operation such as fast-search or fast-rewinding.
  • the tape can be

Abstract

A fast-start target speed and a slow-start target speed are alternatively set in a tape transport device based on a tape pack radius. When the tape pack radius is smaller than a reference tape-pack-radius, the fast-start is selected so that a required time for a fast-run operation such as fast-search or fast-rewinding can be reduced. Further, the tape can avoid being damaged.

Description

DESCRIPTION
Tape Transport Device
Technical Field
The present invention relates to a tape transport device mounted to a magnetic-recording-medium reproduction apparatus, such as a video cassette
recorder and the like, and more particularly to a tape transport device for
transporting a tape at a high speed.
Background Art
Among the recording and playing back media, discs are widely used because of
an excellent access characteristic. This market situation forces the magnetic-tape,
which is inferior to a disc in the access characteristic, to need improvements. The
improvements include: (a) spinning a motor at a higher speed for running a tape,
and (b) saving time for fast-search or fast-rewinding so that the operation of the
apparatus can be improved.
A conventional tape transport device is disclosed in the Japanese Patent
Application non-examined Publication No. H02-49256.
Fig. 4 is a block diagram illustrating a structure of this kind of tape transport
device.
In Fig. 4, the tape transport device comprises the following elements: (a) a motor 101 for driving a tape;
(b) a take up reel 102 to which a first end of the medium is fixed, the rotation
of motor 101 is transmitted to the reel via a belt or a gear to run the medium; and
(c) a supply reel 103 to which a second end of the medium is fixed, the reel
103 supplies or rewind the medium to/from the reel 102.
In the surrounding of motor 101, a speed sensor 104 that outputs a frequency
signal proportional to a rotational speed of motor 101 is disposed. The speed
sensor 104 includes a magnetic resistive element (not shown, and hereinafter
referred to as an MR element) that detects a polarity of the magnet (not shown)
having N and S poles at given intervals and being mounted to the motor 101.
A central processing unit (CPU) 151 outputs a signal responsive to a radius of
the tape (tape pack radius) rolled by the rotations of take up reel 102 and supply reel 103. A D/A converter 152 that converts digital signals into analog signals
receives digital signals regarding the tape pack radius, converts them to analog signals, and outputs the analog signals to a tape speed changer 153.
A controller 154 receives a frequency signal from the speed sensor 104, and
outputs a control signal based on the frequency signal to the tape speed changer
153 so that the motor 101 starts rotating at a certain speed that is increased
progressively to a target speed of a fast-search or fast-rewinding.
The tape speed changer 153 receives the output signal from the D/A converter
152 and the control signal from the controller 154. The changer 153 then changes
a rotation instruction signal, which is to be supplied to a driver 111, responsive to the output from the D/A converter 152, thereby to change a running speed of the
tape.
The relation between the take up reel 102 and supply reel 103 in the fast
forward mode is reversed in the rewinding mode.
An operation of this conventional tape transport device is described hereinafter.
The CPU 151 of conventional tape transport device gives the following
instructions to the tape speed changer 153 via the D/A converter 152.
(a) A progressive speed-up rate of rotational speed at the starting of a fast-
run-mode relies on a tape pack radius on the take up reel 102. In other words, when the tape pack radius is small, the speed-up rate is great, and when the tape
pack radius is large, the speed-up rate is small enough to avoid damaging the tape.
(b) The tape runs at a target speed of the fast-run-mode, which includes a fast-search and the like, when the rotational speed is raised to a given speed. This
type of operation-start is called "slow-start" hereinafter.
Fig. 3 illustrates rising characteristics of the rotational speed of motor 101. In
Fig. 3, the X-axis indicates the time-lapse after the motor 101 is started with the
fast-run instruction, and the Y-axis indicates the rotational speed of motor 101. In
the slow-start mode, when the tape pack radius is large, a starting status of the
motor 101 is indicated by a line 201, and when the tape pack radius is small, the
starting status is indicated by a line 202. A rotational speed of motor 101 in a
playback mode is indicated with "Va", and a top rotational speed thereof is
indicated with "Vb". This conventional structure has the following problem. In the case of a small
tape-pack-radius, the starting-status shown with the line 202 still has a slant
although the tape pack radius is small enough. This slant contributes to
redundancy before the tape reaches to the top speed. Even if the motor 101 rotates
at the highest possible speed, the tape running speed remains low due to the small
tape-pack-radius. Because the rotational speed is increased progressively, it takes
time before the speed reaches a high tape running speed. The tape is thus free
from being damaged because of a small torque loaded to the tape. As a result, this
slow start mode allows redundancy in a fast-search mode or a fast-rewinding mode, which lowers an operating efficiency.
Disclosure of the Invention
The present invention addresses the above problem and aims to provide a tape
transport device that has the following advantage. The tape transport device of
the present invention judges a size of tape pack radius, and a fast-start is selected
when the tape pack radius is small so that a required time for the fast-search or
fast-rewinding can be reduced. This operation is practiced as a start-up mode of
the motor under a fast-run instruction. The operating efficiency of the device is
thus improved.
This fast-start is referred to as a start-up mode where the tape running speed is
increased as quick as possible to a target speed of the fast-start mode.
The tape transport device of the present invention comprises the following elements in order to realize the above objective:
(a) a speed sensor for outputting a frequency signal proportional to a
rotational speed of a motor;
(b) a take up reel to which a first end of a tape is fixed, for rotating by
synchronizing with rotation of the motor;
(c) a supply reel to which a second end of the tape is fixed;
(d) a tape-pack-radius detector for detecting a tape pack radius on the take up
reel;
(e) a fast-start target speed calculator for outputting a target speed with
which the motor starts at a first rotational speed;
(f) a slow-start target speed calculator for outputting a target speed with
which the motor starts at a second rotational speed that is progressively increased thereafter;
(g) a tape-pack-radius comparator for comparing an output from the tape-
pack-radius detector with a predetermined reference tape-pack-radius, and
outputting a comparison result;
(h) target speed setting means for setting a target speed for the motor by
selecting one of an output from the fast-start target speed calculator or slow-start
target speed calculator based on the comparison result;
(i) a speed controller for outputting a rotation instruction signal based on an
output from the speed sensor and an output from the target speed setting means;
and (j) a driver for driving the motor based on the rotation instruction signal.
This structure enables the tape transport device to reduce a required time for
the fast-running operation such as the fast-search mode or fast-rewinding mode.
In addition, this structure restrains a load to the tape, which is produced when the
motor is started, thereby preventing the tape from being damaged.
Brief Description of the Drawings
Fig. 1 is a block diagram illustrating a structure of a tape transport device
utilized in an exemplary embodiment of the present invention.
Fig. 2 is a flow chart depicting a software process in the tape transport device utilized in the exemplary embodiment of the present invention.
Fig. 3 is a chart illustrating a rising characteristic of a rotational speed. Fig. 4 is a block diagram illustrating a structure of a conventional tape
transport device.
Detailed Description of a Preferred Embodiment
The preferred embodiment of a tape transport device of the present invention is
described hereinafter with reference to the attached drawings.
The tape transport device shown in Fig. 1 includes the following elements: (a) a
motor 1 for driving a tape;
(b) a take up reel 2 to which a first end of the tape is fixed, for running the
tape by receiving the motor rotation via a belt or a gear; and (c) a supply reel 3 to which a second end of the tape is fixed, for supplying or
rewinding the tape, which is run by the rotation of the supply reel, to/from the take
up reel.
In the surrounding of motor 1, a speed sensor 4 that outputs a frequency signal
proportional to a rotation speed of motor 1 is disposed. The speed sensor 4 includes
a magnetic resistive element (not shown, and hereinafter referred to as an MR
element) that detects a polarity of the magnet (not shown) having N and S poles at given intervals and being mounted to the motor 1.
A tape-pack-radius detector 5 detects a tape-pack-radius on the take up reel 2
by measuring a time for one rotation of the take up reel 2 when the tape runs at a fixed and an accurate speed in such a mode, e.g. playback in normal speed, in fast
forward, or in rewinding.
A fast-start target speed calculator 6 sets and outputs a target speed of the
motor 1 at a first speed, e.g. a highest possible rotational speed. A low-start target
speed calculator 7 sets a target speed of the motor 1 at a second speed, e.g. a
rotational speed of the normal playback mode as an initial speed and outputs this
target speed. This target speed is progressively increased.
A tape-pack-radius comparator 8 receives the data including a predetermined
reference tape-pack-radius and data of tape pack radius detected by the tape-
pack-radius detector 5, and compares the reference tape-pack-radius with the data.
Based on the comparison result, the comparator 8 then outputs a control signal for
selecting one of the output from the fast-start target speed calculator 6 or output from the low-start target speed calculator 7.
A target speed settor 9 sets one of the output from the fast-start target speed
calculator 6 or output from the low-start target speed calculator 7 as a target speed
based on the control signal tapped off from the comparator 8, and outputs the
target speed to a speed controller 10.
The speed controller 10 receives the rotational speed detected by the speed
sensor 4 and the target speed supplied from the target speed settor 9, and outputs a rotation instruction signal to a driver 11. The driver 11 rotates the motor 1 based
on the rotation instruction signal supplied from the speed controller 10. The relation between the take up reel 2 and supply reel 3 in the fast forward
mode is reversed in the rewinding mode.
The following is a description about how to calculate the tape pack radius by the tape-pack-radius detector 5.
The length (L) of tape rolled up by one rotation of the take up reel 2 is found by the following equation:
L = V, X T,
where V, is a tape running speed, and
T, is a time for one rotation of take up reel 2.
The outer circumference of the reel is found as 27tR, where R is radius spanning
from the reel center to the outer circumference of the rolled tape. Because the tape
is taken up through the rotation of take up reel 2, the tape length (L) equals to 2
7tR. Therefore the following equation is established. R = V, X T, / 2 π
The rotational speed of take up reel 2 is detected with a slit punched on the reel,
the slit is detected by a photo sensor every time it passes by the photo sensor
disposed near the reel. This sensing mechanism is not shown in Fig. 1.
The above calculation method employs a time for one rotation of the reel; however,
when plural slits (A pieces) are provided on the reel, the tape-pack-radius can be
found by a time for 1/A rotation of the reel. A slit can be provided on the motor 1,
and the photo sensor detects the slit. Instead of a combination of a slit and a photo
sensor, a combination of a magnet and a MR element or a Hall element can be
employed with the same effect.
A method of calculating a target speed of the low start with the low-start target
speed calculator 7 is described here. The following equation can be established between the parameters:
V = V0 + T x Δ V
where V0 is an initial speed of the motor,
T is a time lapse from the motor start based on the fast-run instruction,
Δ V is a speed increase per one unit time, and
V is a target speed of the motor.
Next, the operation of the tape transport device shown in Fig. 1 is described
here.
An instruction for taking up the tape is given to the tape transport device
(instruction route is not shown). Then, the speed controller 10 starts the motor 1 via the driver 11. The tape-pack-radius detector 5 detects the tape pack radius on
the take up reel 2 at the starting time. At this time, if the tape has not been played
back before the instruction is given, the tape is desirably once played back before
the tape-pack-radius is calculated.
When the data of the tape pack radius supplied from the tape-pack-radius
detector 5 is smaller than the reference tape-pack-radius, the target speed settor 9
sets the output from the fast-start target speed calculator 6, then outputs it to the speed controller 10 following the control signal from the comparator 8. On the
other hand, when the data of tape pack radius is greater than the reference tape- pack-radius, the target speed settor 9 sets the output from the low-start target
speed calculator 7 following the control signal from the comparator 8. The target
speed settor 9 outputs the target speed to the speed controller 10 such that the rotational speed is increased progressively.
The speed controller 10 supplies the rotation instruction signal to the driver 11
by using the frequency signal proportional to the rotational speed of motor 1 and
the target speed supplied from the target speed settor 9. This rotation instruction
signal contributes to the motor 1 to rotate at a speed approximating to the target
speed.
The driver 11 rotates the motor 1 following the rotation instruction signal from
the speed controller 10. The take up reel 2 driven by the motor 1 takes up the tape
from the supply reel 3.
The relation between the time lapse after the motor 1 starts up and the rotational speed thereof is described with reference to Fig. 3. In this exemplary
embodiment, the fast-start is practiced when the tape pack radius is small. This
fast-start rises instantaneously with little slant as shown by a fine 200. The
required time for the fast running operation such as fast-search or fast-rewinding
can be thus reduced. In the same situation, the conventional tape transport device
needs a longer time because of some slant at the rising as shown with the line 202
in the fast running operation.
In this exemplary embodiment of Fig. 1, the processes 100 surrounded with a
broken line can be practiced with software programmed in a microcomputer. This software processing is described hereinafter with reference to Fig. 2.
First, when the tape is in a normal playback mode or a special playback mode
such as fast-forward playback, or fast-rewinding playback, the tape runs at a fixed and an accurate speed. At this time, the tape pack radius on the take up reel 2 is
calculated by using the time for one rotation of the reel 2 (refer to step 20 in Fig. 2.)
Second, in step 21, the reference tape-pack-radius is given.
Third, in step 22, the data of tape pack radius obtained in step 20 is compared
with the reference tape-pack-radius. When the data is smaller than the reference
tape-pack-radius, step 23 of fast-start target speed setting is selected, then the
target speed of motor 1 is set at the first speed, e.g. the highest possible speed of
motor 1. On the other hand, when the data is greater than the reference tape-
pack-radius, the low-start target speed setting is selected in step 24, where the
target speed is set at the second speed, e.g. the initial speed is a rotational speed in the normal playback mode, and the speed is increased progressively.
Next, in step 25, the rotational speed detected by the speed sensor 4 is given.
Then, in step 26, the rotation instruction signal is supplied by using the rotational
speed and the target speed. This signal is utilized for rotating the motor 1 at the
target speed. Then the process is returned to the step 22, and a new target speed is
set in either step 23 or step 24, the process then goes to step 25 where a rotational
speed is given, and finally goes to the speed control step 26 for supplying a new rotation instruction signal.
In the above description, the rotational speed of motor 1 is increased progressively, which includes "step by step increase."
According to the above and previous descriptions, the structure shown in Fig. 1 and the program shown in Fig. 2 illustrate that the present invention has the
following advantage. Based on the tape pack radius on the take up reel, the output
of either the target speed for fast-start or that for low-start is selected. When the
tape pack radius is smaller than the reference tape-pack-radius, the fast-start is
selected so that the required time for the fast-run operation such as fast-search or
fast-rewinding can be reduced. Further, since the tape pack radius is small, the
tape receives a small load so that the tape can be kept free from damage.
When the tape pack radius is smaller than the reference tape-pack-radius, a
"fast-start" target speed for starting the motor at a first speed is set. When the
tape pack radius is not smaller than the reference tape-pack-radius, another "low
start" target speed is set for starting the motor at a second speed that is progressively increased. Under this arrangement, the output from the speed
sensor is controlled as follows to approximate to the target speed. The above
mentioned first speed is set at, e.g. the top rotational speed of the motor, and the
second speed is set at, e.g. the rotational speed of normal playback operation. The
required time for the fast-run operation such as fast-search or fast-rewinding can
be thus reduced, and the tape can avoid being damaged.
Industrial Apphcability
Based on the tape pack radius, one of the target speed for fast-start or low-start
is selected. When the tape pack radius is smaller than the reference tape-pack-
radius, the motor starts in fast-start mode, thereby reducing the required time for fast-run operation such as fast-search or fast-rewinding. Further, the tape can be
kept free from damage. As a result, the tape transport device that operates with better efficiency can be obtained.

Claims

1. A tape transport device comprising:
(a) a speed sensing means for outputting a frequency signal proportional
to a rotational speed of a motor;
(b) a take up reel to which a first end of a tape is fixed, for rotating by
synchronizing with rotation of the motor;
(c) a supply reel to which a second end of the tape is fixed;
(d) tape-pack-radius detection means for detecting a tape pack radius on
the take up reel;
(e) a fast-start target speed calculating means for outputting a target
speed with which the motor starts at a first rotational speed;
(f) a slow-start target speed calculating means for outputting a target
speed with which the motor starts at a second rotational speed that is
progressively increased thereafter;
(g) a tape-pack-radius comparison means for comparing an output from
said tape-pack-radius detection means with a predetermined reference tape-pack-
radius, and outputting a comparison result;
(h) target speed setting means for setting a target speed for the motor
through selecting one of an output from said fast-start target speed calculating
means and said slow-start target speed calculating means based on the comparison
result;
(i) a speed control means for outputting a rotation instruction signal based on an output from said speed sensing means and an output from said target speed
setting means; and
(j) a driver for driving the motor based on the rotation instruction signal.
2. The tape transport device as defined in Claim 1, wherein a speed of
the motor is controlled by setting the fast-start target speed at the first speed when
the tape pack radius is smaller than the reference tape-pack-radius, and by setting
the slow-start target speed at the second speed that is increased progressively,
when the tape pack radius is not smaller than the reference tape-pack-radius.
3. The tape transport device as defined in Claim 2, wherein said first speed
is a highest possible rotational speed of the motor, and said second speed is a playback mode rotational speed .
PCT/JP1998/005270 1997-12-01 1998-11-24 Tape transport device WO1999028906A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP9/329958 1997-12-01
JP9329958A JPH11162048A (en) 1997-12-01 1997-12-01 Tape like medium running device

Publications (1)

Publication Number Publication Date
WO1999028906A1 true WO1999028906A1 (en) 1999-06-10

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Country Link
JP (1) JPH11162048A (en)
WO (1) WO1999028906A1 (en)

Cited By (4)

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Publication number Priority date Publication date Assignee Title
EP1022734A2 (en) * 1999-01-25 2000-07-26 Matsushita Electric Industrial Co., Ltd. Tape-like medium running device
EP1041550A2 (en) * 1999-03-30 2000-10-04 Matsushita Electric Industrial Co., Ltd. Tape transport device
EP1146511A2 (en) * 2000-04-13 2001-10-17 ORION ELECTRIC CO., Ltd. Tape transport apparatus
US9472236B1 (en) 2015-07-24 2016-10-18 International Business Machines Corporation Reel rotation synchronization for updating time-varying filter parameters

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EP1022734A2 (en) * 1999-01-25 2000-07-26 Matsushita Electric Industrial Co., Ltd. Tape-like medium running device
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US9472236B1 (en) 2015-07-24 2016-10-18 International Business Machines Corporation Reel rotation synchronization for updating time-varying filter parameters

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