JP2008016104A - Magnetic recording/reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the scattering of flux, since the flux contained in soldered portions of circuit components mounted to a printed circuit board attached to the rotary section of a rotary head drum device is scattered by centrifugal force caused by high speed rotation, and stuck to a magnetic tape and the traveling surface of the magnetic tape to cause the deterioration of performance, in the rotary head drum device used for a magnetic recording/reproducing device such as a tape streamer. <P>SOLUTION: In the rotary magnetic head drum device including a lower fixed drum, an upper fixed drum, and a middle rotary drum mounted with the magnetic head and the circuit components thereon, the deterioration of performance caused by the scattering of the flux can be prevented by mounting a flux scattering preventive member formed of a plastic material on the outer peripheral part of the printed circuit board attached to the middle rotary drum by heat-welding. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotating magnetic head drum device used in a magnetic recording / reproducing apparatus such as a tape streamer for recording at a high recording density and a high data rate, and a structure for preventing the scattering of a flux from a print base attached to a rotating part. About.

  JP-A-2000-242902 (Patent Document 1) is known as a conventional technique for suppressing the scattering of flux. In the technique according to this document, the problem is that “when the rotary head cylinder device is assembled, the other end 38 of the terminal 32 and the printed board 40 of the rotary transformer rotor 24 must be connected by soldering. The flux is scattered and adheres to the surface of the rotary transformer rotor 24 facing the rotary transformer stator 28, causing problems such as rotation failure, and environmental problems due to lead contained in the solder. " As a solution, “the upper end 60 of the terminal 56 of the connector 54 has a spring structure and is brought into elastic contact with the contact land of the printed board 62 of the rotary transformer rotor 50, so that an assembly structure that does not require any soldering can be obtained. In addition, the rotary transformer facing area can be increased to improve transmission characteristics It has been described as the door can. ".

  Furthermore, as another prior art, there is JP-A-2004-342249 (Patent Document 2). In the technique according to this document, as a problem, “the present invention aims to provide a rotary head drum device that is easy to manufacture and can reliably receive an adhesive” is described as a solution. The rotary head drum device 21 includes a rotary drum 23, a flexible printed circuit 24, a ring member 25, and a rotary rotary transformer 26. An upper ring 30 of the flexible printed circuit 24 is attached to the rotary drum 23. The lower ring 31 is connected and becomes a part of the adhesive scattering prevention part 42. The ring member 25 is bonded to the upper part of the rotary rotary transformer 26 with a thermosetting resin adhesive, and the upper surface of the ring member 25 is connected. The lower ring 31 of the flexible printed circuit 24 is bonded with a thermosetting resin adhesive. In the groove 43 formed, it is possible to accept the adhesive 41 scattered. "Is described as.

JP 2000-242902 A JP 2004-342249 A

  With the recent digitization of information equipment, the recording rate has increased dramatically in order to increase the transmission speed and cope with the increase in the amount of information. In order to achieve a high recording rate, methods such as increasing the number of rotations of a drum on which a magnetic head is mounted, shortening the wavelength of a recording signal, and increasing the number of recording channels have been adopted. In addition, in order to reduce the size of devices such as tape streamers, it is necessary to perform high-density recording, and the reproduction signal is weakened. To prevent the effects of noise, printed boards equipped with circuit components such as amplifiers (preamplifiers) are required. It is provided on a rotating middle rotating drum and is a middle rotating type rotating magnetic head drum device having an upper middle lower drum configuration. The circuit parts of the print base incorporated in such a rotating magnetic head drum device are mounted on the print base by soldering.

  By the way, flux is generally used for soldering. Usually, printed solder is washed after soldering, but flux may remain. Due to the high speed rotation of the medium rotation drum, the printed flux also rotates at high speed, and the residual flux is affected by the centrifugal force. The flux moves on the print collar in the outer circumferential direction and is scattered outside the print collar and further rotates. The magnetic head drum device may be scattered outside and adhere to the magnetic tape or the magnetic tape traveling surface. When the scattered flux adheres to the magnetic tape or the magnetic tape running surface, it causes a problem of performance deterioration. Therefore, a technique for suppressing flux scattering is required.

  In order to cope with high recording rates and miniaturization in this way, when mounting printed parts with circuit parts on rotating parts, do not cause problems such as performance degradation due to scattering of flux used for soldering circuit parts. It is necessary to make it.

A commonly used measure is cleaning of millet. This is a generally established technique for removing flux and solder balls. However, there are cases where the flux cannot be completely removed due to an increase in the density of circuit components or due to a compatibility factor between the flux and the cleaning agent. Further, there is a problem that flux remains when solder is corrected after cleaning.

  The prior art described in Patent Document 1 relates to an assembly structure that does not require any soldering that causes flux, but the connection in the present invention is between the printed transformer of the rotary transformer rotor and the terminal of the connector. In this section, instead of soldering, the connector terminals are elastically brought into contact with the printed kiban to obtain electrical continuity, which is a technology related to the connection between two different printed kibans and circuit components. It is difficult to apply to the printed kiban.

  In addition, the conventional technique of Patent Document 2 described above prevents scattering by attaching two ring-shaped members having different inner diameters to the rotary rotary transformer with an adhesive of a thermosetting resin so that no uncured portion remains. The part is provided, but two additional parts are required. Furthermore, since a thermosetting adhesive is used, temperature management is required, and there is a problem that facilities and work processes become complicated.

  Therefore, for example, a flux scattering prevention member made of a plastic material is provided on the outer periphery of a print collar attached to a rotating magnetic head drum device of a magnetic recording / reproducing apparatus by heat welding, thereby preventing flux scattering by an inexpensive method. If you can, it will improve reliability.

  An object of the present invention is to provide a highly reliable magnetic recording / reproducing apparatus.

  In order to solve the above-mentioned problem, an outline of one aspect of the present invention is a rotary magnetic head drum device including a lower fixed drum, an upper fixed drum, and a middle rotary drum on which a magnetic head and circuit components are mounted. A flux scattering prevention member made of a plastic material is attached to the outer peripheral portion of a print collar attached to the middle rotating drum by heat welding.

  The present invention is as described in the claims.

  According to the present invention, the reliability of the magnetic recording / reproducing apparatus is improved.

  Problems, configurations, and effects other than those described above will become apparent from the following description of embodiments.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of an embodiment of a magnetic recording / reproducing apparatus using a rotating magnetic head drum apparatus of the present invention. The configuration of a magnetic recording / reproducing apparatus equipped with the rotating magnetic head drum apparatus of the present invention will be described with reference to FIG.

  The magnetic recording / reproducing apparatus includes a rotating magnetic head drum apparatus including a lower fixed drum 3, an upper rotating drum 4, a magnetic head 1, and the like, a mechanism 23, a circuit base 25, a lower case 24, and the like.

  When a magnetic tape (not shown) is attached to the mechanism 23, the mechanism 23 is operated by a circuit base 25, the magnetic tape is wound around the upper fixed drum 4 and the lower fixed drum 3, and the magnetic head 1 is rotated at a high speed to thereby magnetic tape. Recording and playback are performed by contacting the The recording and reproduction signals are processed by the circuit board 25.

  FIG. 2 is a cross-sectional view of an embodiment of the rotary magnetic head drum device of the present invention. The structure of one embodiment of the rotating magnetic head drum apparatus according to the present invention will be described with reference to FIG.

  The shaft 7 is press-fitted into the lower fixed drum 3. Reference numeral 2 denotes an intermediate rotating drum on which the magnetic head 1 is mounted and rotates around a shaft 7 while being controlled at a predetermined rotational speed. 6a and 6b are ball bearings. A preload metal fitting 5 is fixed to the shaft 7 by a set screw 9 and preloads the ball bearings 6a and 6b. A motor rotor 12a is attached to the upper end surface portion of the intermediate rotating drum 2. 12b is a motor coil, and 12c is a motor stator. The upper fixed drum 4 is fastened to the upper end surface of the preload metal fitting 5 attached by a set screw 9 together with a motor stator 12c by a fastening screw 22. The print pad 10 is attached to the intermediate rotating drum 2 with a mounting screw (not shown). One end of a flexible substrate (not shown) is connected and attached to the magnetic head 1 and is connected to a connector (not shown in FIG. 2) mounted on the printed board 10. Further, a rotary transformer connecting connector 11c is mounted on the print board 10, and a rotary transformer flexible board 14 from the rotary transformer rotor 8a is connected through a rotary transformer flexible board hole 21 provided in the print board 10. A rotary transformer stator 8b is arranged opposite to the rotary transformer rotor 8a, and signals are exchanged electromagnetically therebetween.

  At the time of recording, an input signal to the rotary magnetic head drum device is transmitted from the rotary transformer stator 8b to the rotary transformer rotor 8a and input to the print base 10 via the rotary transformer flexible board 14 and the rotary transformer connecting connector 11c. . Next, the input signal is processed by the IC 16a which is a preamplifier IC for signal amplification mounted on the print kiban 10, and then passes through a flexible board (not shown) from a connector (not shown in FIG. 2). It is supplied to the magnetic head 1 and magnetically recorded on a magnetic tape (not shown). During reproduction, the signal is transmitted through the reverse path.

  Here, the print mill 10 and the flux scattering prevention member 15 according to the present invention will be described. The printed board 10 includes an IC 16a which is a preamplifier IC for signal amplification, a connector for connecting a flexible board from the magnetic head 1, a rotating transformer connecting connector 11c for connecting a rotating transformer flexible board 14 from the rotating transformer rotor 8a, a transistor ( A resistor (not shown), a resistance element (not shown), and the like are mounted by soldering.

  The flux scattering prevention member 15 is formed of a plastic material, and is fixed by thermally welding the projection 18 of the flux scattering prevention member that engages with the hole 17 of the printing collar provided in the printing collar 10. The portion of the flux scattering prevention member 15 that is combined with the print collar outer peripheral portion 26 of the print collar 10 has a shape that substantially matches the outer periphery of the print collar 10, and is fitted with the print collar 10. Further, the outer peripheral portion of the flux scattering prevention member 15 on the circuit component mounting surface side has a shape in which a portion 20 in the direction perpendicular to the plane of the printed printed board 10 surrounds the entire circumference, and the inner peripheral shape thereof is a reverse taper. A reverse tapered portion 19 having a shape is formed.

When the rotary magnetic head drum device operates, that is, when the motor rotor 12a rotates, the print blank 10 fixed to the middle rotary drum 2 rotates. When the print mill 10 rotates at high speed, the flux contained in the solder parts of the circuit components such as the IC 16 and the connector 11 mounted on the print mill 10 moves toward the outer periphery of the print mill 10 by centrifugal force.
And if it moves to the edge part of the print base 10, it will adhere to the reverse taper part 19 of the flux scattering prevention member 15, and will accumulate. Thus, since the inner peripheral side surface of the anti-scattering member has a reverse taper shape, flux is accumulated in the reverse taper portion 19 and the scattering of the flux can be further suppressed.

  Here, the height of the vertical portion 20 of the vertical flux scattering prevention member and the amount of inclination of the reverse taper portion 19 are the flux outflows expected depending on the amount of solder used in the printed board 10 and the solder material. It is determined in consideration of the amount.

  The behavior of the flux during high speed rotation will be described with reference to FIGS.

  FIG. 3 is a plan view of a state in which the flux scattering prevention member 15 according to the present invention and the print mill 10 are combined. The printed circuit board 10 includes an IC 16a which is a preamplifier IC for signal amplification, connectors 11a and 11b for connecting a flexible board from the magnetic head 1, and a rotating transformer connecting connector 11c for connecting a rotating transformer flexible board 14 from the rotating transformer rotor 8a. Circuit elements such as transistors (not shown) and resistance elements (not shown) are soldered. The flux scattering prevention member 15 is formed of a plastic material, and is fixed by thermally welding the projection 18 of the flux scattering prevention member that engages with the hole 17 of the printing collar provided in the printing collar 10. The rotary transformer flexible board 14 from the rotary transformer rotor 8a is connected to the rotary transformer connecting connector 11c through the rotary transformer flexible board hole 21.

  The flux remains around the solder after soldering. In this state, when the rotary magnetic head drum device operates, that is, when the motor rotor 12a rotates, the print base 10 fixed to the middle rotary drum 2 rotates. When the print mill 10 rotates at high speed, the flux contained in the solder parts of the circuit parts such as the IC terminal 16b and the connectors 11a, 11b of the IC 16a mounted on the print mill 10 is caused by centrifugal force, so that the outer periphery of the print mill 10 Move to. As an example, the behavior of the flux remaining in the IC terminal portion 16b of the IC 16a will be described below.

  4 is a plan view of the initial state of the flux of the terminal portion of the IC of the present invention, FIG. 5 is a plan view of the movement of the flux of the terminal portion 16b of the IC, and FIG. 6 is the final state after the flux movement of the IC of the present invention. It is sectional drawing. FIG. 6 shows a cross section taken along line AOB in FIG.

  As shown in FIG. 4, the IC terminal 16 b of the IC 16 a is fixed by solder 30, and flux 31 remains and adheres around the solder 30. When the print mill 10 rotates at a high speed, the flux 31 moves to the outer peripheral side of the print mill 10 by centrifugal force as shown in FIG. This phenomenon becomes more prominent as the ambient temperature increases and the flux viscosity decreases. When the flux 31 further moves and reaches the outer peripheral portion of the print collar 10, the flux scattering prevention member 15 is reached.

As shown in FIG. 6, the flux scattering prevention member 15 includes a plane portion 29 of the flux scattering prevention member in contact with the plane portion of the print collar 10 and a peripheral portion 26 of the print collar in a direction perpendicular to the plane of the print collar. And a vertical portion 20 of the flux scattering prevention member, and the projection 18 of the flux scattering prevention member provided on the planar direction portion 29 of the flux scattering prevention member is engaged with the hole 17 of the print collar, so that the projection of the flux scattering prevention member 18 is fixed to the print base 10 by heat welding. Further, the vertical portion 20 of the flux scatter preventing member in the vertical direction is formed over the entire circumference so as to substantially coincide with the outer shape of the printed kiban 10, and the inner peripheral side surface thereof is formed in the reverse tapered portion 19 having a reverse tapered shape. Since the inner peripheral side surface of the vertical portion 20 of the flux scattering prevention member is a reverse tapered portion 19, the flux 31 moved by the centrifugal force from the IC terminal portion 16 b of the IC 16 a is printed printed 10 And collected in the reverse taper portion 19 which is a portion sandwiched between the vertical portions 20 of the flux scattering prevention member, and does not scatter outside the printed board 10. For this reason, the flux does not adhere to the magnetic tape or the magnetic tape running system and cause performance deterioration.

  In addition, since the vertical portion 20 of the flux scattering prevention member has a shape extending over the entire circumference, the influence of deformation due to centrifugal force due to high-speed rotation is small and the reliability is high.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment.

  As is clear from the above description, the present invention includes the following configurations.

  A lower fixed drum having a tape running surface for guiding a magnetic tape formed on an outer peripheral side; an upper fixed drum having a tape running surface for guiding a magnetic tape fixed coaxially with the lower fixed drum; An intermediate rotating drum rotatably mounted coaxially between the lower fixed drum and the upper fixed drum, a magnetic head mounted on the intermediate rotating drum, and an intermediate rotating drum for amplifying a signal of the magnetic head In a magnetic recording / reproducing apparatus equipped with a rotating magnetic head drum device having a printed magnetic board mounted with circuit parts mounted on the magnetic disk, an anti-scattering member for preventing flux scattering disposed on the outer periphery of the printed electronic board, Is fixed by heat welding. As described above, by fixing the flux scattering prevention member to the print collar by heat welding, flux scattering can be suppressed by an inexpensive method.

  Further, the scattering prevention member is made of a plastic material, and includes a planar portion in contact with the plane portion of the print mill and a portion perpendicular to the plane of the print mill at the outer peripheral portion of the print mill. In the case where the protrusion provided on the plate is engaged with the hole of the print collar and is fixed to the print collar by heat-welding the protrusion, the vertical portion substantially matches the outer shape of the print collar. The shape is formed over the entire circumference, and the inner circumferential side surface has a reverse taper shape. Thus, since the inner peripheral side surface of the anti-scattering member has a reverse taper shape, flux accumulates in the reverse taper portion, and the scattering of the flux can be further suppressed.

  Among magnetic recording / reproducing apparatuses, the present invention is particularly used for tape streamers, digital VTRs, digital VTR cameras, broadcasting-use VTRs, etc. that perform high-speed and high-density recording.

The perspective view of the Example of the magnetic recording / reproducing apparatus using the rotating magnetic head drum apparatus of this invention Sectional drawing of the Example of the rotary magnetic head drum apparatus of this invention The top view of the state which combined the flux scattering prevention member of this invention and the printed kiban The top view of the initial state of the flux of the terminal part of IC of this invention Plan view of flux movement of terminal portion of IC of the present invention Sectional view of final state after flux movement of IC of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Magnetic head, 2 ... Medium rotation drum, 3 ... Lower fixed drum, 4 ... Upper fixed drum,
5 ... Preload metal fittings, 6a, 6b ... Ball bearings, 7 ... Shaft, 8a ... Rotary transformer rotor,
8b ... Rotary transformer stator, 9 ... Set screw, 10 ... Print kiban,
11a, 11b ... connector, 11c ... connector for rotating transformer,
12a ... motor rotor, 12b ... motor coil, 12c ... motor stator,
14 ... Rotary transformer flexible substrate, 15 ... Flux scattering prevention member, 16a ... IC,
16b ... IC terminal, 17 ... Print punch hole,
18 ... Protrusion part of flux scattering prevention member, 19 ... Reverse taper part,
20 ... Vertical part of flux scattering prevention member, 21 ... Hole for rotary transformer flexible board,
22 ... Fastening screw, 23 ... Mechanism, 24 ... Lower case, 25 ... Circuit punch,
26 ... outer periphery of printed millet, 29 ... planar direction part of flux scattering prevention member,
30 ... solder, 31 ... flux,

Claims (2)

A lower fixed drum having a tape running surface for guiding a magnetic tape formed on an outer peripheral side; an upper fixed drum having a tape running surface for guiding a magnetic tape fixed coaxially with the lower fixed drum; An intermediate rotating drum rotatably mounted coaxially between the lower fixed drum and the upper fixed drum, a magnetic head mounted on the intermediate rotating drum, and an intermediate rotating drum for amplifying a signal of the magnetic head In a magnetic recording / reproducing apparatus equipped with a rotating magnetic head drum device having a printed circuit board mounted with soldered circuit components attached to
A magnetic recording / reproducing apparatus, wherein a scattering prevention member for preventing flux scattering disposed on an outer peripheral portion of the print mill and the print mill are fixed by heat welding. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the anti-scattering member is made of a plastic material and has a planar portion in contact with the planar portion of the print mill and a peripheral portion of the print mill in a direction perpendicular to the plane of the print mill. With parts,
When the protrusion provided on the planar portion is engaged with the hole of the print collar and fixed to the print collar by thermally welding the protrusion,
The magnetic recording / reproducing apparatus according to claim 1, wherein the vertical portion is formed over the entire circumference so as to substantially coincide with the outer shape of the print collar, and the inner peripheral side surface has a reverse taper shape.

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