JP3232822B2 - Recording and playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to two large and small tape cassettes in which the both ends of a recording medium tape are individually fastened and wound, and the distance between a supply-side tape reel and a take-up tape reel is different. Is a recording / reproducing apparatus such as a VTR in which a supply reel base engaged with at least the supply tape reel is moved at two positions, and is a simple and inexpensive mechanical and electrical tape. The present invention relates to a recording / reproducing apparatus capable of reducing a difference in tension applied to a recording medium tape caused by a difference in a size of a tape cassette and a size of a hub used by a tension adjusting mechanism.

[0002]

2. Description of the Related Art Two tape cassettes, large and small, having different distances between a supply-side tape reel and a take-up tape reel in which both ends of a recording medium tape are individually fastened and wound, respectively, can be mounted. 2. Description of the Related Art There is a VTR (recording / reproducing apparatus) in which a reel base engaged with a reel is moved at two positions.

[0003] Conventionally, such a compatible V
In the TR, the tension of the recording medium tape is adjusted by using a mechanical tape tension adjusting mechanism by adjusting the brake of the supply reel unit, or by applying a voltage (motor torque) applied to the supply side reel unit driving motor. ) Is controlled by an electric tape tension adjusting mechanism.

[0004]

FIG. 6 shows a measurement result of an increase in the tape tension of a VTR using a mechanical tape tension adjusting mechanism. In general, a mechanical tape tension adjusting mechanism generally uses a tape top to a tape end. It is impossible to keep the tension constant up to this point. As described above, when the tape winding diameter becomes small at the tape end,
A sudden increase in tension occurred. In particular, a small tape cassette having a small hub diameter has a greater tension at the tape end than a tape end of a large tape cassette having a large hub diameter. However, since the amount of tape is small, the maximum winding diameter of the tape reel is small. That is, as shown in FIG. 6, it can be seen that the tension of the small tape cassette has a small change width, but shifts toward the larger tension. As a result, the tension at the tape end of the small tape cassette is higher than that at the tape end of the large tape cassette, causing tape damage and unstable tape running. Further, there is a possibility that a similar problem may occur in an electric tape tension adjusting mechanism. In addition, when performing high-speed FF (fast-forward) / REW (rewind) on a large tape cassette, the tape is run at a very high speed. Loss in tension increases tension and leads to tape damage.

Therefore, the present invention provides a recording / reproducing apparatus which can solve the above problems.

[0006]

[ MEANS FOR SOLVING THE PROBLEMS] The structure of the invention according to claim 1 is as follows.
The result is that both ends of the recording medium tape are fastened and wound separately.
Between the supplied supply tape reel and the take-up tape reel
Two large and small tape cartridges with different intervals and hub diameters
A set can be installed, and at least
The supply side reel base that engages with the
Recording / reproducing apparatus having a swing fulcrum as a center.
Tension regulator swingably mounted on the base
At the end of the arm, tension is applied to the recording medium tape.
A tape guide for the supply side tape reel
Linked to the base and relative to the base
A van that slides on a rotatable rotating member without moving
A band member, and one end of the band member is fixed to the base.
And the other end in the tension regulator arm
It is connected to a support part separated from the swing fulcrum, and
Separated from the pivot point of the pivot member provided movably
Between the supporting part and the tension regulator arm
A spring member is provided between the swing fulcrum and the separated support portion.
And a driving means rotatably provided on the base.
The axis that moves along the cam plate linked to the
The length of the spring member can be increased or decreased by forming
Control by the band member and by the tape guide.
Control is performed.

According to a second aspect of the present invention, a recording medium
The supply side tape with both ends fastened and wound separately
Spacing between hub and tape reel on take-up side and hub diameter
Two large and small tape cassettes can be installed
Supply at least engaging with the supply side tape reel.
A recording / reproducing device with a motor that rotates the side reel base
Attach to the base so that it can swing around the swing fulcrum
At the tip of the tension regulator arm
A tape guide for applying tension to the media tape
Provided on a rotating member rotatably provided on the base.
The support part separated from the pivot point and the tension regulation
Between the swing fulcrum and the separated support portion in the data arm.
A spring member is provided therebetween, and is provided rotatably on the base.
Moves along with the cam plate linked to the drive means
Forming the rotating shaft on the rotating member,
The control by the tape guide is performed by expanding and contracting the length of the material.
A pair of magnets near the tape guide.
On the other hand, it corresponds to a pair of magnets on the base.
The swing angle of the tension regulator arm
Provide a detector for detection, and detect
The swing angle of the tension regulator arm
Control the voltage applied to the motor so that
And a control circuit for performing the control.

[0008]

[0009]

According to the recording / reproducing apparatus of the present invention, when the small tape cassette is applied, the cam plate moved by the driving means such as a loading motor rotates so that the urging force of the spring member is reduced. The rotational position of the member is controlled. This makes it possible to reduce the difference in tension applied to the recording medium tape caused by the difference in the hub diameter of the tape cassette used. As a result, the tape tension of the tape end of the small tape cassette does not become higher than that of the tape end of the large tape cassette, so that tape running can be stabilized and tape damage can be reduced. , The reliability can be significantly improved. Furthermore, since the tension of the recording medium tape is controlled by a mechanical tape tension adjusting mechanism using a tension regulator arm, a spring member, and a band member, the structure can be simplified and inexpensive, and the weight does not increase. Has advantages.

When a small tape cassette is applied, a control circuit controls a voltage applied to a supply side reel base driving motor, and mechanically changes a setting force of a spring member without changing a target position of a tension regulator arm. As a result, the set value of the tape tension is reduced, so that the difference in the tension applied to the recording medium tape caused by the difference in the hub diameter of the used tape cassette can be reduced. As a result, since the tape tension of the tape end of the small tape cassette does not become higher than that of the tape end of the large tape cassette, the tape running can be stabilized and the tape damage can be reduced. And reliability can be significantly improved.

Further, since the position of the tension regulator arm is fixed, the degree of freedom of the tape path is improved, and the tape running can be stabilized. On the other hand, when performing FF, in a VTR that presses a pinch roller against a capstan and feeds a tape, a speed-dependent loss at the time of FF may increase tension and cause damage. In order to avoid this, it is conceivable that the urging force of the spring member is reduced by a cam plate or the like at the time of FF as described above. Here, in a VTR in which FF is generally performed by a pinch roller and a capstan, FF and F
WD is the same. In a convertible VTR using large and small tape cassettes having such a configuration, each operation mode of the small tape cassette in the FWD mechanical mode and the FF mechanical mode can be shared. By doing so, the operation mode can be reduced by one position, and the cost and simplification of the entire VTR can be reduced.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

First, two large and small digital audio (D) units used in the digital VTR (recording / reproducing apparatus) of the present invention.
The outline of the AT) cassette (tape cassette) will be described.

In FIG. 1, reference numeral 1 denotes a large tape cassette;
Is the cassette case. The cassette case 2 is in the shape of a flat box having a horizontally-long rectangular shape when viewed from above, and tape outlets 3 are formed at both left and right end portions of the front surface thereof. A mouth part 4 is formed as an opening that opens forward and downward.

In the cassette case 2, tape reels 6 and 6 'on which both ends of a magnetic tape 5 as a recording medium tape are fixed and wound are rotatably housed. ′, Hubs 7 and 7 ′ are formed with reel base engaging holes 7 a and 7 a ′ opened at the lower end thereof.
These reel base engaging holes 7a and 7a '
, And faces the outside through a reel stand insertion hole (not shown) formed in the bottom wall.

A part of the magnetic tape 5 is led out of the cassette case 2 from the tape outlets 3 and 3 and is located along the front surface of the mouse unit 4. In addition,
A front lid and the like, which are rotatably supported on the front surface of the cassette case 2 and open and close the front surface of the magnetic tape 5 spanned along the front surface of the cassette case 2, are provided. Is omitted.

In FIG. 2, reference numeral 8 denotes a small tape cassette;
Is the cassette case. The cassette case 9 has a flat rectangular box shape which is considerably smaller than the cassette case 2 of the large tape cassette 1 when viewed from above, and like the large tape cassette 1, the tape outlets 10, 1
0, a mouth portion 11 as an opening, etc., and tape reels 13 and 13 'around which a magnetic tape (recording medium tape) 12 is wound are housed therein. In addition, 1
Reference numerals 4 and 14 'denote hubs of the tape reels 13 and 13'.
The small tape cassette 8 has a smaller diameter than the large tape cassette 1. 14a, 14a 'are reel base engaging holes opened at the lower ends of the hubs 14, 14'. The reel base engaging holes 14a, 14a 'engage with the reel bases of the tape reels 6, 6' of the large tape cassette 1. It has substantially the same size as the holes 7a, 7a '.

In FIGS. 1 and 2, reference numeral 15 denotes a digital VTR as a recording / reproducing device, which is a so-called compatible type which can use the above two types of large and small tape cassettes 1, 8. Reel hubs 7, 7 'and 1
Reel bases 18, 18 'that engage with and rotate
Gears 18a and 18a 'are sub reel units (rotating members)
And 17 and 17 'gears 17a and 17a'
Each rotates. A brake drum 17b is formed at the lower end of the sub reel base 17 on the tape supply (supply) side.

Reference numeral 19 denotes a chassis serving as a base. Pull-out guides 20 and 20 'are provided upright at the other ends of a pair of pull-out arms (not shown) which are swingably supported by the chassis 19. Then, the magnetic tape 5 or 12 in the tape cassette 1 or 8 is pulled out from the cassette case 2 or 9 by the pull-out guides 20 and 20 '. Reference numeral 21 denotes a head drum provided at a substantially central portion in the left-right direction on the rear side of the chassis 19, which has a fixed drum and a rotating drum, and a magnetic head (not shown) is supported on the rotating drum. Reference numerals 22 and 22 'denote tape loading blocks, which are loading guides 23 and 2 respectively.
3 'and inclined guides 24, 24', which are moved along guide grooves 25, 25 'provided in the chassis 19, and are located slightly deeper on both sides of the head drum 21 during tape loading. It is designed to be moved to the loading completion position.

Reference numeral 26 denotes a capstan, which is rotated by a capstan motor 27 and protrudes above the chassis 19 at a position slightly separated to the right of the head drum 21. 28
Is a pinch roller arm whose base end is the chassis 1
9 is rotatably supported at a position on the right side slightly behind the center. And a pinch roller 2 is provided at its rotating end.
9 is rotatably supported.

As shown in detail in FIG . 3, reference numeral 30 denotes a tension regulator arm. The tension regulator arm is located at a position slightly closer to the other end than one end to a position slightly closer to the left side than the center of the chassis 19 via a swing fulcrum 30a. And swingably supported. Then, the tension regulator arm 3
A tape guide 31 is provided upright at the other end of the tape guide 0. Such a tension regulator arm 30 is operated by a tension coil spring (spring member) 35 at the time of operation during reproduction or recording.
As a result, the magnetic tape 5 is rotated in a counterclockwise direction when viewed from above by the moving force exerted on the magnetic tape 5, and comes into elastic contact with the portion of the magnetic tape 5 between the guide 20 and the loading guide 23 from the inside.

Reference numeral 32 denotes a band-shaped brake band (band member). One end of the band is supported by a support portion 33 near the left end of the center of the chassis 19, and the other end is supported by one end of the tension regulator arm 30. It is supported by the part 34. The middle portion 32a of the brake band 32 is connected to the brake drum (rotating portion) of the sub reel base 17 on the supply side.
Material) 17b.

3 and 4 show details of the tension regulator mechanism. One end of the tension coil spring 35 is hung on a supporting portion 34 a separated from the swing fulcrum 30 a of the tension regulator arm 30, and the other end is supported on a supporting portion 40 distant from a turning fulcrum 45 of a spring hooking member (turning member) 40.
a. A shaft 41 projecting downward is formed on the spring hooking member 40, and the shaft 41 fits into a cam groove 44 formed on a cam plate 43 on which a gear 42 is formed.
It is. Further, the spring hooking member 40 is configured to swing around a pivot point 45. Therefore, the spring hooking member 40 rotates with the rotation of the cam plate 43. By this movement, the length of the tension coil spring 35 can be changed, and the set value of the back tension can be changed.

By using the tension regulator mechanism having such a configuration and reducing the set value of the back tension when the small tape cassette 8 is used, the minimum and maximum tensions when the small tape cassette 8 is used can be reduced to those of the large tape cassette 1. It is possible to stay within the tension change during use. Since the tension needs to be reduced at the time of the high-speed FF as described above, when performing the high-speed FF with the large tape cassette 1, the high-speed FF is performed at the position of the FWD cam plate 43 of the small tape cassette 8. That is, by combining the operation modes of the mechanical mode of the small tape cassette 8 at the time of FWD and the mechanical mode of the large tape cassette 1 at the time of FF, the entire operation mode can be reduced by one position.

In FIGS. 1 and 2, the cam plate 43 is rotated by a motor (drive means) 55 using gears 50-54. The judgment of the large tape cassette 1 and the small tape cassette 8 is made by using the cassette discriminating switch 56. That is, the microcomputer (CPU) 57 switches the cassette discrimination switch 5
6 is detected, the rotation of the motor 55 is controlled via the driver 58, and the set value of the tension is changed.

FIG. 5 shows a second embodiment. In the second embodiment, the tension of the magnetic tape 5 or 12 is electrically controlled, and a small tape cassette having a hub diameter smaller than that of the large tape cassette 1, similarly to the mechanical tape tension adjusting mechanism of the first embodiment. 1 is an electrical tape tension adjusting mechanism for suppressing an increase in tension. FIG.
In the middle, 30a is the swing of the tension regulator arm 30
An N-pole magnet 36a is provided on the back surface of the tension regulator arm 30 on the tape guide 31 side.
And the S-pole magnet 36b are fixed. A hall element (detector) 38 for detecting the swing angle (θ) of the tension regulator arm 30 is attached to a flexible wiring board 37 arranged on the chassis 19 below the tension guide arm 30 on the side of the tape guide 31. It is.

In FIG. 5, reference numeral 39 denotes a cassette discriminating switch, which of the large and small tape cassettes 1 and 8 is the VTR 15
It is determined whether or not the camera has been attached to the camera. A control circuit 60 controls a voltage applied to a reel base driving motor 66 that rotates the supply-side reel base 18 in accordance with the swing angle of the tension regulator arm 30. In the control circuit 60, 61 is an amplifier,
62 is an A / D (analog / digital) converter, 63 is C
PU (central processing unit), 64 is a D / A (digital / analog) converter, and 65 is an amplifier. In addition, other configurations are
Since it is the same as the first embodiment, the same reference numerals are given and the description is omitted.

Then, the reel bases 18, 1 of the VTR 15
When one of the large and small tape cassettes 1 and 8 is mounted on 8 'via a cassette holder (not shown), the cassette discriminating switch 39 discriminates the size of the tape cassette, and the CPU 63 determines the type of the cassette (for example, small). In addition to knowing the tape cassette 8), the type (for example, tape thickness) of the magnetic tapes 5 and 12 can be known through a switch (both not shown) through a recognition hole indicating the type of tape.

Next, when reproducing (PB) or storing (REC) the VTR 15, the tension coil spring (spring member) 35 is used.
5, the tape guide 31 of the tension regulator arm 30 swinging about the swing fulcrum 30a is moved to the position of the pair of magnets 36a,
36b and the Hall element 38 on the chassis 19 side. On the tape guide 31, the magnetic tape 12 (5)
Is running, the tension regulator arm 30 stops in a state where the tape tension (back tension) and the urging force of the tension coil spring 35 are balanced. That is, by setting the tension regulator arm 30 at a fixed position, a fixed tape tension can be maintained. Here, the CPU 63 detects the swing angle of the tension regulator arm 30 through the Hall element 38, the amplifier 61, and the AD converter 62, and adjusts the swing angle of the tension regulator arm 30 to a target position.
To control the voltage applied to the motor 66 for rotating the motor. In such a VTR 15, large and small tape cassettes 1,
In the case of the small tape cassette 8, the motor 71 is rotated by the CPU 63 via the driver 59 based on the signal obtained from the cassette discriminating switch 39 for discriminating No. 8. Motor 7
Gear 72 is provided in the 1, the cam via a gear 73
The plate 74 is rotated. On the other hand, the other end of the tension coil spring 35 whose one end is hung on the support portion 30b separated from the swing fulcrum 30a of the tension regulator arm 30 is rotated.
A spring hanging member (rotating member) 7 that rotates around the fulcrum 76
5 is hooked on the supporting portion 75b remote from the pivot point 76, the spring hooking member 75 is rotated by the shaft 78 and the cam groove 77. As a result, the tension force of the tension coil spring 35 changes. In this manner, even if the diameter of the tape wound around the hub 14 by the small tape cassette 8 becomes smaller, the tape tension does not increase significantly, and the same operation and effect as those of the first embodiment can be obtained.

According to the above-described embodiments, a DAT cassette used for a digital VTR or the like as a large or small tape cassette having a different hub diameter has been described. However, the tape cassette is not limited to the DAT cassette.
Needless to say, the above embodiments can be applied to a tape cassette such as an HS type tape cassette or an 8 mm tape cassette.

[0031]

As described above, according to the present invention, the recording
Media tape with both ends fastened and wound separately
Between the tape reel on the take-up side and the tape reel on the take-up side;
Two large and small tape cassettes with different hub diameters are installed.
And at least engages with the supply tape reel.
That the supply side reel base moves in two positions.
Recording / reproducing device, rotatable about a swing fulcrum
Of the tension regulator arm attached to the base
At the tip is a tape for applying tension to the recording media tape.
Loop guide linked to the tape reel base on the supply side.
Tied and involves relative movement with respect to the substrate
A band member that slides on a rotatable rotating member without
And one end of the band member is fixed to the base and the other end is
The swing support in the tension regulator arm
It is connected to the support part separated from the point and is rotatably mounted on the base.
A supporting portion of the rotating member separated from the pivot point;
The swing support in the tension regulator arm
A spring member is provided between the point and the spaced support, and
Is rotatably provided and is linked to the driving means.
A shaft that moves along the cam plate is formed on the rotating member.
To extend or shorten the length of the spring member,
Control by the tape member and control by the tape guide.
As a result, the difference in tension applied to the recording medium tape caused by the difference in the hub diameter of the tape cassette used can be reduced. This allows
Since the tape tension of the tape end of the small tape cassette does not become higher than that of the tape end of the large tape cassette, the tape running can be stabilized and the tape damage can be reduced. Can be significantly improved. Further, since the tension of the recording medium tape is controlled by a mechanical tape tension adjusting mechanism using a tension regulator arm, a spring member, and a band member, the recording medium tape can be configured simply and inexpensively and the weight does not increase. Has advantages.

When a small tape cassette is applied, the control circuit controls the voltage applied to the supply side reel base driving motor, and mechanically changes the set force of the spring member without changing the target position of the tension regulator arm. As a result, the set value of the tape tension is reduced, so that the difference in the tension applied to the recording medium tape caused by the difference in the hub diameter of the used tape cassette can be reduced. As a result, since the tape tension of the tape end of the small tape cassette does not become higher than that of the tape end of the large tape cassette, the tape running can be stabilized and the tape damage can be reduced. And reliability can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a schematic plan view illustrating a state in which a large tape cassette is mounted in a recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic plan view showing a state in which a small tape cassette is mounted in the recording / reproducing apparatus.

FIG. 3 is an enlarged plan view of a main part of a mechanical tape tension adjusting mechanism of the recording / reproducing apparatus when a large tape cassette is mounted.

FIG. 4 is an enlarged plan view of a main part of the mechanical tape tension adjusting mechanism of the recording / reproducing apparatus when a small tape cassette is mounted.

FIG. 5 is an enlarged plan view of a main part of an electric tape tension adjusting mechanism of the recording / reproducing apparatus.

FIG. 6 is a graph showing the relationship between tape tension in large and small tape cassettes by a conventional mechanical tape tension adjusting mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Large tape cassette 5 ... Magnetic tape (recording medium tape) 6, 6 '... Tape reel 7, 7' ... Hub 8 ... Small tape cassette 12 ... Magnetic tape (recording medium tape) 13, 13 '... Tape reel 14, 14 '... hub 15 ... VTR (recording / reproducing device) 17 ... sub reel stand (rotating member) 17a ... gear 18 ... supply side reel stand 18a ... gear 19 ... chassis (base) 30 ... tension regulator arm 30a ... fulcrum 30b ... support 32 ... Brake band (band member) 34a ... Support part 35 ... Tension coil spring (spring member) 38 ... Hall element (detector) 39 ... Cassette discriminating switch 40 ... Spring member (rotating member) 40a ... Support part 43 ... Cam Plate (cam means) 45 ... fulcrum 60 ... control circuit 66 ... motor 74 ... cam plate (cam means) 75 ... spring hook Material (rotating member) 75b ... supporting portion 75 ... supporting point

────────────────────────────────────────────────── ─── Continuing on the front page (72) Katsuji Akimoto, Inventor 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Masatake Takase 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo In Sony Corporation (56) References JP-A-5-234185 (JP, A) JP-A-61-276153 (JP, A) JP-A-6-12742 (JP, A) JP-A-2-30136 (Japanese) JP, U) JP 3-84932 (JP, U) JP 52-1713 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 15/43

Claims (2)

(57) [Claims] 1. A large- and small-sized tape cassette in which both ends of a recording medium tape are individually fastened and wound, and a space between a supply-side tape reel and a take-up tape reel and a hub diameter which are different from each other, can be mounted. A recording / reproducing apparatus in which at least a supply reel unit engaged with the supply tape reel is moved at two positions, the recording / reproducing apparatus being attached to the base so as to be swingable about a swing fulcrum.
At the end of the tension regulator arm,
A tape guide is provided to give tension to the
Linked to the tape reel base on the supply side and
A rotatable turn that does not move relative to the substrate
A band member is provided for sliding contact with the transfer member, and the band member is
One end is fixed to the base and the other end is the tension regulator.
On the support part of the oscillator arm that is separated from the pivot point
Coupled to a rotating member rotatably provided on the base.
And a support part separated from the pivot point to
A support part of the oscillator arm that is separated from the pivot point
A spring member is provided between the base member and the base member is rotatably provided on the base.
Along with the cam plate interlocked with the drive means.
The spring is formed by forming a moving shaft on the rotating member.
Control by the band member by expanding and contracting the length of the member
A recording / reproducing apparatus characterized by performing control by a tape guide . 2. A large and small tape cassette having different distances and hub diameters between a supply-side tape reel and a take-up tape reel on which both ends of a recording medium tape are individually fastened and wound, respectively, can be mounted. A recording / reproducing apparatus having a motor for rotating at least a supply-side reel base engaged with the supply-side tape reel, the recording / reproduction apparatus being attached to the base so as to be swingable about a swing fulcrum.
At the end of the tension regulator arm,
A tape guide is provided to give tension to the
A rotation support for a rotation member rotatably provided on the base;
A support part separated from a point and the tension regulator arm
A spring between the swing fulcrum and the separated support portion in the
A member is provided, and the member is rotatably provided on the base.
The axis that moves along the cam plate linked to the drive means
The length of the spring member is formed on the rotating member.
Control by the tape guide by expanding and contracting,
One in the vicinity of Te Pugaido providing a pair of magnets
A position corresponding to a pair of magnets on the base
Detects the swing angle of the tension regulator arm.
And a detector for detecting the
Target with swing angle of tension regulator arm
Control to control the voltage applied to the motor so that
A recording / reproducing apparatus comprising a control circuit .