JPH07134888A - Recording/reproducing apparatus - Google Patents

Abstract

PURPOSE:To correctly detect a thickness of a tape from a changing amount of a counted FG number of a capstan thereby to calculate a remaining time of the tape, by repeatedly measuring the FG number of the capstan in a period of a fixed rotating number of times of a feed or wind reel. CONSTITUTION:Sensors 7, 8 detect FG pulses generated correspondingly to the rotation of a feed reel 3 and a wind reel 4, respectively. An FG magnet 9 detects capstan FG pulses (FG pulses) generated correspondingly to the rotation of a capstan 5. Reel FG counting parts 13, 14 count FGs of the feed reel and wind reel detected by the sensors 7, 8 and amplified by amplifiers 10, 11, respectively. A CFG counting part 15 repeatedly measures a counted CFG number in a period corresponding to a fixed rotating number of times of the feed reel or wind reel and transmits the number to a tape thickness-detecting part 16. The detecting part 16 receiving the number calculates a thickness of the tape from a changing amount of the counted number of CFG pulses.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus having a tape thickness detecting means for detecting the running amount and remaining amount of a tape which is a recording medium.

[0002]

2. Description of the Related Art In a magnetic recording / reproducing apparatus for recording or reproducing, various methods for detecting the running amount of a tape which is a recording medium have been proposed. For example, there is a method of indicating the remaining tape amount as a ratio to the total tape amount (hereinafter, referred to as remaining amount ratio). That is, the side area of the tape wound on the supply reel is S
_{Let S be} the side area of the tape wound on the winding reel and S _T be the tape remaining amount ratio, which is obtained by S _S / (S _S + S _T ). Here, when the tape thickness is K, the reel hub radius is R _h , the number of tape windings on the supply side and the number of tape windings on the winding side are n _S and n _T , respectively, S _S and S _T are S _S = π (R _h + n _S K) ² −πR _h ² (1) S _T = π (R _h + n _T K) ² −πR _h ² (2). Also, both reels on the supply side and the winding side are 1
The capstan FG counts C _S and C _T measured during rotation are CFG for the capstan FG and υm for the tape speed.

[0003]

[Equation 1]

[0004] Expressions (3) and (4) are expressed as n _S K, n _T
Solving for K,

[0005]

[Equation 2]

[0006] Therefore, the remaining tape ratio is calculated from the equations (1), (2) and (3) ', (4)' as follows.

[0007]

[Equation 3]

From this, the remaining amount ratio can be detected by performing the calculation according to the equation (5) based on the FG count number of the capstan counted in the period corresponding to one rotation of both the supply side reel and the take-up side reel. To be done.

On the other hand, the recordable time L to the end of the tape
Let K be the tape thickness,

[0010]

[Equation 4]

[0011] If the FG count number of the capstan measured during one rotation of the supply reel is C _S ,

[0012]

[Equation 5]

[0013] From this, if an appropriate value is selected for the tape thickness K, the remaining value can be obtained by performing the calculation according to the above equation (9) based on the FG count number of the capstan measured in a period corresponding to one rotation of the supply reel. Quantitative time detection is realized.

[0014]

However, in the method of calculating the remaining time shown in the equation (9), the tape thickness K
Is treated as a fixed value regardless of the tape type. For this reason, a large error appears in the detection result of the remaining time depending on the type of tape.

In the tape case for 8 mm, the tape thickness information of 13/10 μm can be obtained by opening / closing the tape thickness detecting hole. However, in the tape thickness detection using such a detection hole, it is necessary to set a sensor for performing the tape thickness detection. The tape thickness information obtained from the detection hole is a rough one, and slightly differs depending on the tape. There are problems such as not being able to obtain accurate information on the tape thickness and being unable to cope with the increase in the types of tapes with different thicknesses.

The present invention addresses the above-mentioned problems by providing:
To provide a magnetic recording / reproducing apparatus or the like equipped with a tape thickness detecting means capable of accurately detecting a tape thickness by software without setting hardware and further accurately calculating a remaining time. The purpose is.

[0017]

According to a first aspect of the present invention, there is provided a capstan motor for feeding a tape as a recording medium, a CFG pulse generating means for generating an FG pulse in response to the rotation of the capstan motor, and CFG counting means for counting FG pulses of a capstan motor, winding reel of the recording medium tape, supply reel of the recording medium tape, and FG pulse generation in response to rotation of the supply reel Reel FG pulse generating means, rotation speed calculation means for calculating the rotation speed of the supply reel from the count number of FG pulses of the supply reel, and counting in a period corresponding to a certain rotation speed of the supply reel. And a measuring means for repeatedly measuring the capstan FG pulse, and a continuously measured cow of the capstan FG. A construction which is characterized by comprising a tape thickness detecting means for calculating a tape thickness from betting amount of variation recording or reproducing.

According to a second aspect of the present invention, a capstan motor for feeding a tape as a recording medium, a CFG pulse generating means for generating an FG pulse corresponding to the rotation of the capstan motor, and an FG pulse for the capstan motor. CFG counting means for counting the recording medium, the reel for supplying the tape as the recording medium, the reel for winding the tape as the recording medium, and the reel FG pulse generation for generating the FG pulse corresponding to the rotation of the reel on the winding side. Means, reel FG counting means for counting the FG pulses of the take-up reel, rotation number calculation means for calculating the number of revolutions of the take-up reel from the number of FG pulses of the take-up reel, and the take-up side The capstan FG pulse counted in a period corresponding to a certain number of rotations of the reel is repeatedly measured. It is a configuration, wherein measuring means, and that the succession comprises a tape thickness detecting means for calculating a tape thickness from the count number of the change amount of the capstan FG that is measured for recording or reproducing.

According to a third aspect of the present invention, a capstan motor for feeding a tape as a recording medium, a CFG pulse generating means for generating an FG pulse corresponding to the rotation of the capstan motor, and an FG pulse for the capstan motor. CFG counting means, a supply-side reel of the recording medium tape, a reel-side reel of the recording medium tape, and a reel FG pulse generation means for generating an FG pulse corresponding to the rotation of the supply-side reel. A rotation speed calculation means for calculating the rotation speed of the supply reel from the count number of the FG pulse of the supply reel; and the cap counted during a certain rotation of the supply reel from an arbitrary first timing. From the measurement of the stun FG pulse and the arbitrary second timing different from the first timing, That the measuring means for performing measurements of the capstan FG pulses are counted during the predetermined rotation, the capstan motor F corresponding to the tape winding speed of said supply reel in said first and second timing
The present invention is characterized in that a tape thickness detecting means for calculating the tape thickness from the amount of change in the count number of G pulses is provided to perform recording or reproduction.

According to a fourth aspect of the present invention, a capstan motor for feeding a tape as a recording medium and a CF for generating an FG pulse corresponding to the rotation of the capstan motor.
G pulse generating means, CFG counting means for counting FG pulses of the capstan motor, tape supply side reel of the recording medium, winding side reel of the recording medium tape, rotation of the winding side reel. Correspondingly, reel FG pulse generation means for generating an FG pulse, rotation speed calculation means for calculating the rotation speed of the winding side reel from the count number of the FG pulse of the winding side reel, and the first from the arbitrary first timing Measurement of the capstan FG pulse while the take-up reel rotates for a certain period of time, and counting while the take-up reel rotates for a certain period of time from an arbitrary second timing different from the first timing. Measuring means for measuring the capstan FG pulse, and the winding side at the first and second timings A construction which is characterized in that comprises a tape thickness detecting means for calculating a tape thickness from the count number of the change amount of the capstan FG pulses corresponding to the tape winding speed of Lumpur recording or reproducing.

[0021]

With the above-described structure, the present invention continuously measures the FG count number of the capstan of one of the supply-side reel and the winding-side reel during a period corresponding to a certain fixed number of rotations of the reel. Then, the tape thickness can be detected by calculation from the measurement result of the change amount of the FG count number of the capstan corresponding to the number of tape windings of the same reel.

Further, with respect to either the supply-side reel or the take-up-side reel, measurement of the count number of the capstan FG, which is measured during arbitrary constant rotation of the reel from arbitrary first and second timings, respectively. Then, the tape thickness can be detected by calculation from the amount of change in the count number of the capstan FG corresponding to the number of tape windings of the same reel at arbitrary first and second timings.

Then, the remaining time of the tape can be accurately calculated by detecting the tape thickness.

[0024]

EXAMPLES A magnetic recording / reproducing apparatus according to examples of the present invention will be described below.

(First Embodiment) FIG. 1 is a block diagram showing an embodiment of the present invention.

In the figure, 1 is a rotary drum equipped with a head, 2 is a tape as a recording medium, 3 and 4 are supply reels and take-up reels of the tape 2, and 5 is a tape 2 which is brought into pressure contact with 6 pinch rollers. And 7 and 8 are sensors for detecting pulse signals (hereinafter referred to as reel FG) generated in response to the rotation of the supply-side reel 3 and the winding-side reel 4, respectively.

Reference numeral 9 is an FG for detecting a pulse signal (hereinafter referred to as CFG) generated in response to the rotation of the capstan 5.
Magnets 10 and 11 are amplifier units for amplifying the reel FG detected by the sensors 7 and 8, respectively, and 12 is an amplifier unit for amplifying CFG detected by the FG magnet 9.

Reference numerals 13 and 14 are reel FG counting sections for counting the supply side reel FG amplified by the amplifier section 10 and the winding side reel FG amplified by the amplifier section 11, respectively, and 15 is amplified by the amplifier section 12. CF
A CFG count unit that counts G, and 16 is a tape thickness detection unit that calculates the tape thickness.

FIG. 2 is a flow chart showing the operation of the tape thickness detecting section 16, which will be described in detail with reference to FIG.

First, the number of rotations of the supply-side reel and the winding-side reel is measured by using the reel FG counted by the reel FG counting units 13 and 14 (steps S1 to S1).
S4). Based on this measurement result, the FG count number of the capstan, which is measured by the CFG counting unit 15, is measured for one of the supply side reel and the take-up side reel during a period corresponding to a certain number of rotations of the reel. (Steps S5 and S6). The tape thickness is measured by continuously performing the same measurement and measuring the FG count numbers C1 and C2 of the capstan that are converted corresponding to the number of windings of the same reel (steps S7 and S8).

The calculation of the tape thickness is based on the following principle.

First, the calculation method when the tape thickness is calculated using the rotation speed of the supply-side reel will be described. Assuming that the number of tape windings of the supply-side reel at the time of starting the tape thickness detection is n _S , the FG count number C1 of the capstan measured by the CFG counting unit in the period corresponding to n rotations of the supply-side reel is

[0033]

[Equation 6]

The FG count number C2 of the capstan measured in the period corresponding to the next successive n revolutions is

[0035]

[Equation 7]

It becomes Therefore, the tape thickness K is calculated from the equations (10) and (11) as follows.

[0037]

[Equation 8]

Similarly, a method of calculating the tape thickness using the number of rotations of the take-up reel will be described.

When the number of tape windings on the take-up reel at the start of tape thickness detection is n _t , the FG count number of the capstan measured by the CFG counting unit during the period corresponding to n rotations of the take-up reel at this time. C1 is

[0040]

[Equation 9]

The CG count number C2 of the capstan measured in the period corresponding to the next n consecutive rotations is

[0042]

[Equation 10]

It becomes Therefore, the tape thickness K is calculated from the equations (13) and (14) as follows.

[0044]

[Equation 11]

Further, since the tape thickness detecting section can obtain the FG count number of the capstan measured by the CFG counting section in a period corresponding to one rotation of the supply side reel and the winding side reel, the tape thickness can be obtained. It is possible to measure the remaining amount ratio simultaneously with the detection. Further, in the tape thickness detecting unit, when the tape thickness detection is completed, it is possible to accurately calculate the remaining time described in Expression (9) by using either Expression (12) or Expression (15).

As described above, according to this embodiment,
For either the supply-side reel or the take-up-side reel, the FG count number of the capstan, which is measured during a period corresponding to a certain number of rotations of the reel, is continuously measured to determine the number of tape windings of the reel. The tape thickness can be detected from the change amount of the FG count number of the capstan corresponding to.

Therefore, the tape thickness can be detected without being restricted by hardware. Further, by adjusting the detection period, it is possible to provide a magnetic recording / reproducing apparatus that can obtain the required sufficient measurement accuracy and accurately calculate the remaining time of the tape.

(Second Embodiment) FIG. 3 is a block diagram showing a second embodiment of the present invention.

The block configuration is the same as the block configuration of the above-described embodiment, and the same or corresponding portions are denoted by the same reference numerals, and the duplicate description will be omitted.

FIG. 4 is a flow chart showing the operation of the tape thickness detecting section 16 of this embodiment, which will be described in detail with reference to FIG.

First, the number of rotations of the supply-side reel and the winding-side reel is measured from the reel FG counted by the reel FG counting units 13 and 14 (steps S11 to S1).
4). Based on this measurement result, the CFG counting unit 1 is turned on for either the supply-side reel or the take-up-side reel while the reel makes one rotation from an arbitrary first timing.
The measurement of the FG count number C1 of the capstan measured at 5 and the CF during one rotation of the reel from any second timing when the reel has rotated n times from the first timing
The FG count number of the capstan measured by the G count unit 15 is measured (steps S15 and S16), and the FG count number of the capstan corresponding to the tape winding number of the same reel at the first and second timings is changed. The tape thickness is measured by measuring the amount (steps S17 and S18).

The calculation of the tape thickness is based on the following principle.

First, a method of calculating the tape thickness using the rotation speed of the supply reel will be described. When the number of tape windings of the supply-side reel at an arbitrary first timing is n _S , the FG count number C1 of the capstan measured by the CFG counting unit during one rotation of the supply-side reel is:

[0054]

[Equation 12]

From the above measurement, assuming that the number of tape windings of the supply-side reel at an arbitrary second timing when the supply-side reel makes n rotations is n _S -n, at this time, the CFG is generated during one rotation of the supply-side reel. The FG count number C2 of the capstan measured by the counting unit is

[0056]

[Equation 13]

It becomes Therefore, the tape thickness K is calculated from the equations (16) and (17) as follows.

[0058]

[Equation 14]

Similarly, a method of calculating the tape thickness using the number of rotations of the take-up reel will be described.

Assuming that the number of tape windings of the winding-side reel at an arbitrary first timing is n _t , the FG count number C1 of the capstan measured by the CFG counting unit during one rotation of the winding-side reel at this time. C1 = P (R _h + n _t K) (19) From the above measurement, assuming that the number of tape windings of the take-up reel at an arbitrary second timing when the take-up reel makes n turns is n _t + n , The reel on the take-up side is 1
The FG count number C2 of the capstan measured by the CFG count unit during rotation is

[0061]

[Equation 15]

It becomes Therefore, the tape thickness K is calculated from the equations (19) and (20) as follows.

[0063]

[Equation 16]

Further, since the tape thickness detecting unit can obtain the FG count number of the capstan measured by the CFG counting unit while the supply-side reel and the winding-side reel make one revolution, the tape thickness is detected. It is possible to measure the remaining amount ratio at the same time as the measurement. When the tape thickness detection is completed, the tape thickness detection unit can use the formula (18) or (2
It is possible to accurately calculate the remaining time described in the equation (9) using any one of the equations 1).

As described above, according to this embodiment,
Regarding either the supply-side reel or the take-up-side reel, the measurement of the FG count number of the capstan measured from the arbitrary first timing during a certain rotation of the reel and the arbitrary first timing different from the first The FG count number of the capstan measured from the second timing while the same rotation of the reel is performed, and the FG count number of the capstan corresponding to the tape winding number of the reel at the first and second timings is measured. The tape thickness can be detected by measuring the change amount of.

Therefore, the tape thickness can be detected without being restricted by hardware, and the required sufficient measurement accuracy can be obtained by adjusting the detection period.
Further, since the measurement is performed intermittently at an arbitrary timing, the reel is driven / driven at a cycle shorter than the tape thickness detection period.
The tape thickness can be measured even when the tape is repeatedly stopped, and the remaining time of the tape can be accurately calculated.

[0067]

As described above, according to the present invention,
It is not necessary to set the thickness of the recording tape in the hardware, and the tape thickness detection means provided in the device can accurately detect the tape thickness, so it is sufficient to increase the number of tapes with different thicknesses. It is possible to provide a magnetic recording / reproducing apparatus or the like that can deal with this and can accurately calculate the remaining time of the tape.

[Brief description of drawings]

FIG. 1 is a block diagram of a first embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the tape thickness detection unit of the first embodiment.

FIG. 3 is a block diagram of a second embodiment.

FIG. 4 is a flow chart showing the operation of the tape thickness detection unit of the second embodiment.

[Explanation of symbols]

 1 Rotating Drum with Head 2 Tape as Recording Medium 3 Supply Reel 4 Take-up Reel 5 Capstan 6 Pinch Roller 7 Supply Side Reel FG Sensor 8 Reel Side Reel FG Sensor 9 FG Magnet 10 Supply Side Reel FG Use Amplifier section 11 Winding side reel FG amplifier section 12 CFG amplifier section 13 Supply side reel FG counting section 14 Winding side reel FG counting section 15 CFG counting section 16 Tape thickness detecting section

Claims (4)

[Claims] 1. A capstan motor for feeding a tape as a recording medium, a CFG pulse generating means for generating an FG pulse corresponding to the rotation of the capstan motor, and a CFG count for counting the FG pulse of the capstan motor. Means, winding reel of the recording medium tape, supply reel of the recording medium tape, reel FG pulse generating means for generating FG pulse in response to rotation of the supply reel, supply reel Rotation speed calculation means for calculating the rotation speed of the supply-side reel from the count number of the FG pulse of the capstan FG, which is counted in a period corresponding to a certain rotation speed of the supply-side reel.
Recording characterized by comprising a measuring means for repeatedly measuring a pulse and a tape thickness detecting means for calculating the tape thickness from the continuously measured variation of the count number of the capstan FG for recording or reproduction. Playback device. 2. A capstan motor for feeding a tape as a recording medium, a CFG pulse generating means for generating an FG pulse corresponding to the rotation of the capstan motor, and a CFG count for counting the FG pulse of the capstan motor. Means, supply reel of the recording medium tape, winding reel of the recording medium tape, reel FG pulse generating means for generating FG pulse in response to rotation of the winding reel, the winding Side reel FG
Reel FG counting means for counting pulses, rotation speed calculation means for calculating the rotation speed of the winding side reel from the count number of FG pulses of the winding side reel, and corresponding to a certain rotation speed of the winding side reel Recording means provided with a measuring means for repeatedly measuring the capstan FG pulse counted in a predetermined period, and a tape thickness detecting means for calculating the tape thickness from the amount of change in the count number of the capstan FG continuously measured. Recording / reproducing apparatus characterized by performing reproduction 3. A capstan motor for feeding a tape as a recording medium, a CFG pulse generating means for generating an FG pulse corresponding to the rotation of the capstan motor, and a CFG count for counting the FG pulse of the capstan motor. Means, supply reel of the recording medium tape, reel of the recording medium tape, reel FG pulse generating means for generating FG pulse in response to rotation of the supply reel, supply reel Rotation speed calculation means for calculating the rotation speed of the supply side reel from the count number of the FG pulse of the above, and measurement of the capstan FG pulse counted during a certain rotation of the supply side reel from an arbitrary first timing. And during a certain rotation of the supply side reel from an arbitrary second timing different from the first timing Measuring means for measuring the capstan FG pulse counted on the basis of the change amount of the count number of the capstan motor FG pulse corresponding to the tape winding number of the supply side reel at the first and second timings. A recording / reproducing apparatus comprising a tape thickness detecting means for calculating the thickness to perform recording or reproduction. 4. A capstan motor for feeding a tape as a recording medium, a CFG pulse generating means for generating an FG pulse corresponding to the rotation of the capstan motor, and a CFG count for counting the FG pulse of the capstan motor. Means, supply reel of the recording medium tape, winding reel of the recording medium tape, reel FG pulse generating means for generating FG pulse in response to rotation of the winding reel, the winding Side reel FG
Rotation speed calculation means for calculating the rotation speed of the take-up reel from the pulse count number, and measurement of the capstan FG pulse counted during a certain rotation of the take-up reel from an arbitrary first timing. And a measuring means for measuring the capstan FG pulse counted during a certain rotation of the take-up reel from an arbitrary second timing different from the first timing, the first and second measuring means. Recording or reproducing is performed by including tape thickness detecting means for calculating the tape thickness from the amount of change in the count number of the capstan FG pulse corresponding to the number of tape windings of the take-up reel at the timing. Recording / playback device.