JP3612968B2 - Tape drive - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tape driving device that drives a reel by rotation of a capstan motor.
[0002]
[Prior art]
In recent years, among video tape recorders (VTRs) that are magnetic recording / reproducing devices, especially camera-integrated VTRs called movies are desired to be reduced in size and weight, and there are various tape drive devices that drive the tapes. Proposals for reducing the size and weight have been made.
[0003]
A conventional tape drive used for a magnetic recording / reproducing apparatus will be described below.
FIG. 3 is a cross-sectional view of a conventional tape drive device, and FIG. 4 is a structural view seen from the bottom.
[0004]
3 and 4, reference numeral 10 denotes a capstan shaft, which is rotatably supported by a housing 12 having a bearing. A stator substrate 14 includes a plurality of stator coils 16 and a plurality of hall elements 18, and is fixed to the chassis 20 together with the housing 12. A rotor 22 includes a magnetized rotor magnet 24, a rotor boss 26, and a capstan shaft 10.
[0005]
An idler pulley 30 is rotatably supported by a shaft 32 planted in the chassis 20. A belt 28 is hung between a drive pulley 27 and an idler pulley 30 provided on the rotor boss 26.
[0006]
The operation of the conventional tape drive configured as described above will be described below.
[0007]
As is well known, the Hall element 18 first detects the magnetic flux of the magnetized rotor magnet 24. A motor driving means (not shown) energizes the stator coil 16 from the output of the hall element 18 to generate an alternating magnetic field to drive the rotor magnet 24 and rotate the rotor 22. The capstan shaft 10 is rotated by the rotation of the rotor 22, and the pinch roller (not shown) presses against the rotating capstan shaft 10 with the magnetic tape (not shown) interposed therebetween, so that the magnetic tape is transported and driven. To do.
[0008]
At the same time, the belt 28 hung between the drive pulley 27 and the idler pulley 30 rotates the idler pulley 30 and winds the magnetic tape through the rotation of the idler pulley 30 through a rotational force transmission means (not shown) such as an idler gear. To a reel base (not shown) for winding the magnetic tape.
[0009]
[Problems to be solved by the invention]
However, in the above-described conventional configuration, since the belt 28 is disposed under the rotor 22, the capstan motor including the belt 28 increases in thickness, and the apparatus using the capstan motor cannot be thinned.
[0010]
Further, since it is necessary to decelerate and transmit the rotation of the rotor 22 to the reel base, the diameter of the drive pulley 27 is set small, and the diameter of the idler pulley 30 is set large. For this reason, the belt 28 is wound around the drive pulley 27. There was a problem that the angle of attachment was small and the contact area was small, slipping and sufficient transmission torque could not be obtained, or tooth skipping occurred even when a toothed belt was used for the belt 28. .
[0011]
Furthermore, since the idler pulley 30 has a large diameter, the distance between the forward path and the return path of the belt 28 hung on the idler pulley 30 is increased, and the area occupied by the belt loop is large. As a result, the placement of parts was severely restricted and miniaturization of the equipment was hindered.
[0012]
SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and an object thereof is to provide a tape drive device capable of reducing the size and thickness of a device while maintaining the current state of the degree of rotation reduction and transmission of rotational force. .
[0013]
[Means for Solving the Problems]
In order to achieve this object, a tape drive device according to the present invention includes a capstan shaft for transferring a tape, and a motor having magnets magnetized in a plurality of poles on a plane so as to rotationally drive the capstan shaft. The rotor means, a magnetic substrate made of a magnetic material that forms a magnetic circuit with a gap in the rotor means, and at least a planar fixing means provided between the rotor means and the magnetic substrate, In order to rotationally drive the rotor means, a plurality of driving coil means arranged in a plane on the fixing means in the gap, and arranged on the fixing means on the same plane as the driving coil means, detect the rotational position of the rotor means At least one rotation position detecting means, a first pulley means provided in a gap between the fixing means and the rotor means, and rotating with the rotor means, and a belt hand for transmitting the rotation of the first pulley means. And a second pulley means for transmitting the rotation of the first pulley means by the belt means, and a position regulating means for abutting the belt means and regulating the position, the belt means being adjacent to the rotational position. The position restricting means is provided on the outer periphery of the rotor means so as to pass between the detecting means or between the rotating position detecting means and the drive coil means. In particular, the rotating position detecting means has its main body. A first terminal group and a second terminal group facing each other with the first terminal group on the inner peripheral side and the second terminal group on the outer peripheral side so as to be substantially parallel to the belt means. Or the position regulating means comprises a fixed shaft and a roller member rotatably supported by the fixed shaft, and the belt means is a forward path of a portion through which the belt means passes. And the return bell It has a configuration characterized in that the distance between the means is regulated by the position regulating means so as to be smaller than the distance between two tangent lines in contact with the outer periphery of the first pulley means and the second pulley means. doing.
[0014]
With this configuration, it is possible to obtain a tape drive device capable of reducing the size and thickness of the device.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
In the first aspect of the present invention, the belt means is passed between the rotational position detecting means or between the rotational position detecting means and the drive coil means in the gap between the rotor means and the magnetic substrate. Yes, it has the effect of realizing a reduction in the thickness of equipment equipped with this tape drive.
[0016]
According to the second aspect of the present invention, the belt means is passed between the rotational position detecting means or between the rotational position detecting means and the drive coil means in the gap between the first and second rotor means facing each other. And has the effect of realizing a thinner device equipped with the tape drive.
[0017]
According to a third aspect of the present invention, the rotational position detecting means having the first and second terminal groups facing each other is arranged such that the terminal group longitudinal direction is substantially the same as the rotor means radial direction, particularly substantially parallel to the belt means. Thus, the wiring connection of the rotational position detecting means can be saved in space, and the tape drive device can be further reduced in size.
[0018]
The invention described in claim 4 uses a rotating roller as the position restricting means for restricting the belt means, and has the effect of reducing the rotational load of the motor and contributing to low power consumption.
[0019]
The invention according to claim 5 has the effect of increasing the winding angle of the belt means by the position regulating means, improving the transmission torque and reducing the space occupied by the belt means to reduce the size of the device.
[0020]
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2.
(Embodiment 1)
FIG. 1 is a cross-sectional view of an embodiment of the tape drive device of the present invention, and FIG. 2 is a structural view as seen from the bottom.
[0021]
1 and 2, reference numeral 40 denotes a capstan shaft, which is supported by a housing 42 having a bearing. Reference numeral 44 denotes a stator substrate as fixing means, which has a plurality of stator coils 46 as drive coil means and a plurality of hall elements 48 as rotation position detecting means, and is fixed to the chassis 50 together with the housing 42. A rotor 52 is composed of a rotor magnet 54, a rotor boss 56, and a capstan shaft 40 that are magnetized in a plurality of poles. Reference numeral 60 denotes an idler pulley which is a second pulley means, and is supported by a shaft 62 planted in the chassis 50. Reference numeral 58 denotes a belt, which is hung between a driving pulley 57 and an idler pulley 60 which are first pulley means provided on the rotor boss 56. The difference from the configuration of the conventional tape drive device is that, as will be described later, the stator coil 46 is thinned out, and a plurality of hall elements 48 are concentrated on the thinned portion, and the belt 58 is placed on the stator substrate 44 and the rotor magnet 54. The rotor boss 56 is disposed on the stator substrate 44 side of the rotor 52 so as to pass between them.
[0022]
The operation of the tape drive device of the present invention configured as described above will be described below.
[0023]
First, the operation of the motor will be described. The rotor magnet 54 of the rotor 52 is magnetized with 10 poles alternately N and S in the surface direction.
[0024]
In order to drive the rotor 52 in three phases, six stator coils 46 are arranged at a mechanical angle of 48 ° pitch.
[0025]
In general, a three-phase driving motor is set so that the relationship between the number of magnetic poles and the number of stator coils is 4: 3.
[0026]
In the present embodiment having the 10-pole rotor magnet 54, the number of stator coils 46 is calculated to be 7.5, but it is impossible in practice. Three hall elements 48a, 48b and 48c are arranged as means for detecting the rotational position of the rotor magnet 54.
[0027]
The Hall elements 48a, 48b, and 48c are arranged at an electrical angle of 120 °, that is, at a mechanical angle of 24 ° pitch, detect the position of the rotor magnet 54, and sequentially energize the stator coil 46, thereby providing a predetermined gap with the stator coil 46. To drive the opposed rotor magnet 54 to rotate the rotor 52.
[0028]
The rotation of the rotor 52 causes the coaxial capstan shaft 40 to move a magnetic tape (not shown) in cooperation with a pinch roller (not shown).
[0029]
Next, the operation of the belt 58 for transmitting the rotation of the rotor 52 to the outside will be described. The belt 58 is hung between an idler pulley 60 supported by a shaft 62 planted in the chassis 50.
[0030]
The idler pulley 60 is provided for the purpose of winding the magnetic tape by transmitting the rotation of the rotor 52 to a reel base (not shown) for winding the magnetic tape through an idler gear (not shown).
[0031]
As shown in FIG. 1, the belt 58 has a thickness in the height direction smaller than the thickness of the stator coil 46, and the drive pulley 57, which is a drive source of the belt 58, has a height position between the stator substrate 44 and the rotor magnet 54. The height of the drive pulley 57 and the idler pulley 60 is set so that the belt 58 passes through the gap.
[0032]
Further, as shown in FIG. 2, a guide roller 66 as a position restricting means rotatably supported by two restricting pins 64 is erected on the outer periphery of the portion of the stator substrate 44 where the hall element 48 is attached. The width of the belt 58 is restricted so as to be in contact with the outer periphery of the belt 58.
[0033]
The position of the guide roller 66 is set so that the forward path portion and the return path portion of the belt 58 pass between the Hall elements 48a and 48b, and between the 48b and 48c, whereby the belt 58 to the drive pulley 57 is set. The winding angle can be made large and contact with the Hall element 48 is also prevented.
[0034]
Further, the Hall element 48 has terminals 68a and 68b provided to face each other in order to supply power and take out a signal. The Hall element 48 has a terminal 48a and a terminal 68b. The connecting center line is arranged parallel to the line connecting the centers of the drive pulley 57 and idler pulley 60, and the Hall elements 48a and 48c are arranged so that the center line connecting the terminals 68a and 68b is parallel to the adjacent belt 58.
[0035]
As a result, the maximum space is obtained between the Hall elements 48a and 48b, and between the 48b and 48c through which the belt 58 passes.
[0036]
As described above, according to the embodiment of the present invention, the belt 58 is disposed between the rotor magnet 54 of the rotor 52 and the stator substrate 44, between the adjacent hall elements 48a, 48b, and 48c, and on the same plane as the stator coil 46. Since it is arranged, the thickness of the capstan motor is not increased by the belt 58, and it is possible to reduce the thickness of the device on which the tape drive device is mounted with dimensions that are not different from those without the belt 58.
[0037]
Further, since the belt 58 is regulated by a guide roller 66 rotatably supported, the rotational load of the motor does not increase. Further, the belt 58 is squeezed by the guide roller 66 and the winding angle around the drive pulley 57 is increased. As a result, the slipping and tooth skipping are not generated, and the space occupied by the loop of the belt 58 is small, and other parts can be placed around it, so that the device can be downsized. Is obtained.
[0038]
In the embodiment described above, the stator coil 46 as the drive coil means and the hall element 48 as the rotational position detecting means are fixed on the stator substrate 44 in which the magnetic substrate and the fixing means are bonded together. Although the tape drive device has been exemplified, the present invention is not necessarily limited thereto. That is, the magnetic substrate and the fixing means are separate components, for example, the magnetic substrate rotates together with the rotor means such as the rotor magnet 54, and the drive coil means is applied to the stator substrate 44 provided between the magnetic substrate and the rotor magnet 54. As in the tape drive device of the above-described embodiment, a tape drive device using a so-called sub-rotor type motor in which a stator coil 46 and a hall element 48 as a rotational position detection means are fixed and fixed means is used. It is included in the range.
[0039]
Furthermore, a tape drive device using a so-called double magnet type motor that uses a rotor means such as a rotor magnet 54 instead of a magnetic substrate that rotates together with the rotor means is similar to the tape drive device of the above-described embodiment. It is included in the scope of claims. In this case, since the magnetic field becomes stronger in the above-described embodiment, a motor that generates a stronger rotational driving force can be realized.
[0040]
Further, in the above-described embodiment, the regulation pin 64 is fixed to the stator substrate 44 among the guide roller 66 that is a roller member constituting the position regulation means and the regulation pin 64 that is a fixed shaft that rotatably supports the guide roller 66. However, it goes without saying that the same effect can be obtained by fixing the idler pulley 60 to the chassis 50 in the same manner as the shaft 62 that rotatably supports the idler pulley 60.
[0041]
Further, in the above-described embodiment, the three Hall elements 48 serving as the rotational position detecting means are exemplified. However, the present invention is not limited to this, and one or two rotational position detecting means are provided depending on the motor driving method. However, since the position of the rotor means can also be detected, the size can be further reduced.
[0042]
In addition, although the tape drive device in the VTR for running the magnetic tape has been described as an example, the present invention is not necessarily limited to this, and the same effect can be obtained with a tape drive device for running and winding a general strip-shaped tape. Needless to say, it is obtained.
[0043]
【The invention's effect】
As described above, the present invention is excellent in that it can provide a tape drive device capable of reducing the size and thickness of a device without impairing the degree of rotation reduction and transmission of rotational force.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an embodiment of a tape drive device of the present invention. FIG. 2 is a bottom view of the tape drive device. FIG. 3 is a cross-sectional view of a conventional tape drive device.
44 Stator board 48a Hall element 48b Hall element 48c Hall element 52 Rotor 57 Driving pulley 58 Belt 60 Idler pulley 66 Guide roller

Claims (5)

A rotor means of a motor having a capstan shaft for transferring the tape, a magnet magnetized with a plurality of poles on a plane so as to drive the capstan shaft, and a surface having a gap in the rotor means A magnetic substrate made of a magnetic material that constitutes a magnetic circuit opposite to each other, a planar fixing means provided between the rotor means and the magnetic substrate, and the gap for rotating the rotor means A plurality of drive coil means arranged on a plane on the fixing means, and at least one rotation position detecting means arranged on the same fixing means as the drive coil means for detecting the rotation position of the rotor means A first pulley means provided in a gap between the magnetic substrate and the rotor means and rotating together with the rotor means; a belt means for transmitting the rotation of the first pulley means; The belt means comprises a second pulley means to transmit the rotation of said first pulley means, a position regulating means for regulating the contact position on the belt means,
The position restricting means is provided on the outer periphery of the rotor means so that the belt means passes between adjacent rotating position detecting means or between the rotating position detecting means and the drive coil means. A tape drive. A first rotor means of a motor having a capstan shaft for transferring the tape, a magnet magnetized in a plurality of poles on a plane so as to rotationally drive the capstan shaft; and a gap in the rotor means. A surface provided between a second rotor means having a magnet magnetized with a plurality of poles on a plane and the first and second rotor means forming a magnetic circuit opposite to each other. A plurality of drive coil means arranged in a plane on the fixing means in the gap to rotationally drive the first and second rotor means, and the same plane as the drive coil means At least one rotational position detecting means for detecting the rotational position of the first and second rotor means, and provided in the gap between the opposed first and second rotor means, Said first and second rotor means; First pulley means for rotating the first pulley means, belt means for transmitting the rotation of the first pulley means, second pulley means for transmitting the rotation of the first pulley means by the belt means, and the belt Position regulating means for contacting the means and regulating the position, and the belt means passes between adjacent rotational position detecting means or between the rotational position detecting means and the drive coil means. In addition, the tape drive apparatus is characterized in that the position restricting means is provided on the outer periphery from the first and second rotor means. The rotational position detection means has a first terminal group and a second terminal group that are opposed to each other around the main body, the first terminal group is on the inner peripheral side, the second terminal group is on the outer peripheral side, 3. The tape drive device according to claim 1, wherein the tape drive device is arranged so as to be substantially parallel to the belt means. 3. The tape drive device according to claim 1, wherein the position restricting means includes a fixed shaft and a roller member rotatably supported by the fixed shaft. In the belt means, the distance between the belt means in the forward path and the return path through which the belt means passes is smaller than the distance between the two tangent lines in contact with the outer periphery of the first pulley means and the second pulley means. The tape drive device according to claim 1 or 2, wherein the tape drive device is regulated by a position regulating means.

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