JP2006012309A - Chassis of recording and reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chassis of a recording and reproducing apparatus, which relaxes stress concentration on fixed parts. <P>SOLUTION: The chassis (1A) of a recording and reproducing apparatus has; a mounting part (10) which is made of a metallic plate supporting a drive part (2) of the recording and reproducing apparatus and has the drive part mounted thereon; first and second bending parts (31A and 32A) facing each other which are formed in both side ends (11 and 12) of the mounting part by bending the metallic plate; and a third bending part (33A) formed in one end other than the both side ends of the mounting part by bending the metallic plate. Each of the first to third bending parts has: a pair of rising parts (311 and 312, 321 and 322, or 331 and 332) formed apart from each other by bending the metallic plate at right angles; and a connection part (313, 323, or 333) connecting end parts of the pair of rising parts. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a chassis of a recording / reproducing apparatus. As the recording / reproducing apparatus, there are magnetic recording / reproducing apparatuses such as a DAT (digital audio tape) recorder that performs magnetic recording by a helical scan method, an 8 mm tape recorder, and a streamer apparatus.

  As is well known in this technical field, the helical scan method is one of data recording methods and records data in an oblique direction with respect to a magnetic tape. The helical scan method can easily increase the capacity and capacity compared to the tandem scan method in which data is recorded horizontally with respect to the magnetic tape. Such a helical scan method is employed in DAT recorders, 8-mm tape recorders, streamer devices, and the like.

  The DAT recorder is a cassette type tape recorder that digitizes and records and reproduces audio signals, and has excellent performance because it is not affected by the non-linearity of the medium. As a cassette, a compact dedicated cassette of 54 × length 73 × thickness 10.5 mm is used. The data recorded on the magnetic tape includes audio data and information for cueing and tracking. In order to increase the recording density, a rotary head system (a so-called helical scan system) is used for recording and reproduction on the magnetic tape. The magnetic tape is pulled out from the cassette, wound spirally around a rotating head drum mounted at an angle, and a track is formed obliquely on the magnetic tape. At the time of recording / reproduction, a signal for automatic tracking recorded on the track in advance is detected, and control is performed so that the magnetic head is correctly on the track.

  On the other hand, the streamer device is a large-capacity external storage device using a cartridge type magnetic tape and is also called a tape drive. The streamer device is configured to perform magnetic recording / reproduction by sliding a magnetic tape on a rotating drum having a plurality of magnetic heads (see, for example, Patent Document 1).

  The streamer device has a rotating drum (also referred to as “upper drum”) to which a plurality of magnetic heads are attached, and a fixed drum (also referred to as “lower drum”) fixed on the chassis, and the rotating drum is fixed. It is connected to the upper end of a rotating shaft that is supported at the center of the drum. The rotation of the motor disposed below the fixed drum is transmitted to the rotating drum via the rotating shaft.

  In addition, a pair of recording magnetic heads and a pair of reproducing magnetic heads are alternately arranged on the rotating drum at intervals of 90 degrees with respect to the circumferential direction. The pair of recording magnetic heads and the pair of reproducing magnetic heads are disposed at 180 ° intervals for the a channel and the b channel, respectively.

  Therefore, for example, when the tape winding angle is 180 degrees, the a-channel reproducing magnetic head starts to slide on the magnetic tape when the a-channel recording magnetic head advances 90 degrees. When the a-channel recording magnetic head advances 180 degrees, the a-channel reproducing magnetic head moves to the 90-degree position, and at the same time, the b-channel recording magnetic head slides on the magnetic tape. Start.

  As described above, the recording magnetic head and the reproducing magnetic head can simultaneously record and reproduce information while sliding on the magnetic tape.

  On the other hand, each magnetic head provided on the rotary drum is connected to an amplifier or the like disposed on a fixed substrate via a rotary transformer. The rotary transformer is composed of a pair of ring-shaped rotary transformer halves, and is arranged so that the rotor-side rotary transformer half and the stator-side rotary transformer half face each other with a minute gap therebetween. The In addition, a groove for accommodating a transformer coil corresponding to each magnetic head is formed concentrically on the plane of each rotary transformer half, and the same when the recording transformer coil and the reproducing transformer coil are close to each other. It is attached to a flat surface.

  A rotary drum unit comprising a combination of a rotary head drum in a DAT recorder, a rotary drum in a streamer device, a fixed drum, a rotary shaft, and a motor is called a drive unit. This drive unit is mounted (mounted) on the chassis.

  When fixing a chassis on which such a drive unit is mounted, three-point fixing is mainly used in order to prevent mounting distortion of the chassis.

  A conventional chassis 1 will be described with reference to FIG. The chassis 1 is made of a metal plate that supports the drive unit 2 of the recording / reproducing apparatus, and the drive unit 2 is mounted thereon. The chassis 1 includes a flat mounting portion 10 on which the driving unit 2 is mounted. The mounting portion 10 has first and second side ends 11 and 12 facing each other, and one end 13 on a side different from the side ends 11 and 12.

  The chassis 1 is formed by bending a metal plate at the first side end 11 of the mounting portion 10 and by bending the metal plate at the second side end 2 of the mounting portion 10. And a third bent portion 33 formed by bending the metal plate at one end 13 of the mounting portion 10.

  In the conventional chassis 1, as shown in FIG. 1, each of the first to third bent portions 31 to 33 is simply a bent piece. First to third fixing holes 31a, 32a, 33a for fixing the chassis 1 are formed in the first to third bent pieces 31 to 33, respectively.

  That is, the chassis 1 is fixed at three points by screws (not shown) through the first to third fixing holes 31a to 33a. The first bent piece 31 is fixed to the left side wall (not shown) of the recording / reproducing apparatus with a screw through the first fixing hole 31a, and the second bent piece 32 is connected through the second fixing hole 32a. The third bent piece 33 is fixed to the rear wall (not shown) of the recording / reproducing apparatus with a screw through the third fixing hole 33a. Is done.

  That is, the conventional chassis 1 is supported and fixed at the three points of the first to third bent pieces 31 to 33.

JP 2003-203302 A

  In the conventional chassis 1 having such a structure, since the chassis 1 and the drive unit 2 mounted on the chassis 1 are supported by the bent pieces 31 to 33 through the three fixing holes 31a to 33a, There is a problem that stress concentrates on the surface.

FIG. 2 shows an analysis result (von Mises stress) by simulation when the conventional chassis 1 is fixed with the bent pieces 31 to 33 via the three fixing holes 31a to 33a. According to this analysis result, a result was obtained that there was a maximum stress value of 26.58 kgf / mm ² at the location A where the first bent piece 31 was bent from the mounting portion 10.

  Therefore, an object of the present invention is to provide a chassis of a recording / reproducing apparatus that can alleviate stress concentration at a fixed location.

  Other objects of the invention will become apparent as the description proceeds.

  According to the present invention, a chassis (1A; 1B) made of a metal plate that supports the drive unit (2) of the recording / reproducing apparatus, the mounting unit (10) on which the drive unit is mounted, and both sides of the mounting unit First and second bent portions (31A, 32A; 31B, 32B) facing each other formed by bending the metal plate at the ends (11, 12) and one end of the mounting portion different from the both side ends And a third bent portion (33A) formed by bending the metal plate, wherein each of the first to third bent portions is spaced apart from the metal plate. A pair of rising portions (311, 312; 321, 322; 331, 332) formed by bending the plate at a right angle and a connecting portion (313; 3) connecting the ends of the pair of rising portions. 3; 333) and the chassis of the recording and reproducing apparatus characterized by having obtained.

  In the chassis (1A) of the recording / reproducing apparatus, a first fixing hole (31a) is provided in one rising portion (311) of the first bent portion (31A), and the second bent portion (32A). Is provided with a second fixing hole (32a) at one rising portion (321), and a third fixing hole (33a) at the center of the connecting portion (333) of the third bent portion (33A). Good.

  Further, in the chassis (1B) of the recording / reproducing apparatus, a first fixing hole (31a) is provided in the center of the connecting portion (313) of the first bent portion (31B), and the second bent portion ( 32B) is provided with a second fixing hole (32a) at the center of the connecting portion (323), and a third fixing hole (33a) is provided at the center of the connecting portion (333) of the third bent portion (33A). It may be provided.

  The reference numerals in the parentheses are given for ease of understanding, and are merely examples, and of course are not limited thereto.

  In the present invention, the chassis is supported by the connecting portion of the first to third bent portions, which has a larger area than the fixed portion, so that the stress at the fixed portion can be dispersed and the stress concentration can be reduced.

  With reference to FIG. 3, the chassis 1A of the recording / reproducing apparatus according to the first embodiment of the present invention will be described. The chassis 1A of the illustrated recording / reproducing apparatus has the same configuration as the chassis 1 of the conventional recording / reproducing apparatus illustrated in FIG. 1 except that the configurations of the first to third bent portions are different, as will be described later. Has the same function. Accordingly, reference numerals 31A, 32A, and 33A are assigned to the first to third bent portions, respectively. Also, components having the same functions as those of the components of the conventional chassis 1 are denoted by the same reference numerals, and description thereof is omitted for the sake of simplicity.

  The first to third bent portions 31A to 33A have the same configuration. The first bent portion 31A includes a pair of rising portions 311 and 312 formed by bending a metal plate at a right angle apart from each other, and a connecting portion 313 that connects end portions of the pair of rising portions 311 and 312. Have Similarly, the second bent portion 32A is a connection that connects a pair of rising portions 321 and 322 formed by bending a metal plate at a right angle apart from each other, and ends of the pair of rising portions 321 and 322. Part 323. The third bent portion 33A includes a pair of rising portions 331 and 332 formed by bending the metal plate at a right angle apart from each other, and a connecting portion 333 that connects the ends of the pair of rising portions 331 and 332. Have

  A first fixing hole 31a for fixing the chassis 1A is formed in one rising portion 311 of the first bent portion 31A. Similarly, a second fixing hole 32a for fixing the chassis 1A is formed in one rising portion 321 of the second bent portion 32A. A third fixing hole 33a for fixing the chassis 1A is formed in the center of the connecting portion 333 of the third bent portion 33A.

  The chassis 1A having such a structure is fixed at three points by screws (not shown) through the first to third fixing holes 31a to 33a. The first bent portion 31A is fixed to the left side wall (not shown) of the recording / reproducing apparatus with a screw through the first fixed hole 31a, and the second bent portion 32A is fixed through the second fixed hole 32a. Are fixed to the right side wall (not shown) of the recording / reproducing apparatus with screws, and the third bent portion 33 is fixed to the rear wall (not shown) of the recording / reproducing apparatus with screws through the third fixing holes 33a. Is done.

  That is, in the illustrated chassis 1A, the first to third bent portions 31A to 33A are supported by the three surfaces of the connecting portions 313 to 333, and are fixed at three points of the first to third fixing holes 31a to 33a. . In other words, each of the connecting portions 313 to 333 of the first to third bent portions 31A to 33A functions as a support portion when fixing the chassis 1A.

  As described above, since the chassis 1A is supported by the support portions (connecting portions) 313 to 333 having a larger area than the fixed location, the stress at the fixed location can be dispersed and the stress concentration can be reduced.

FIG. 4 shows an analysis result (von Mises stress) by simulation when the chassis 1A according to the first embodiment is fixed at the bent portions 31A to 33A via the three fixing holes 31a to 33a. According to this analysis result, a result that a maximum stress value of 17.84 kgf / mm ² is obtained from the mounting portion 10 to the fixing portion B of the second bent portion 31 was obtained. That is, it can be seen that the maximum stress value is smaller in the chassis 1A according to the present embodiment than in the conventional chassis 1.

  Moreover, since the fixing location itself of the chassis 1A remains at three points, the plane of the mounting portion 10 is maintained, and the mounting distortion of the chassis 1A can be avoided.

  With reference to FIG. 5, a chassis 1B of a recording / reproducing apparatus according to a second embodiment of the present invention will be described. The chassis 1B of the recording / reproducing apparatus shown in the figure is the same as the chassis 1A of the recording / reproducing apparatus shown in FIG. 3 except that the first and second fixing holes 31a and 32a are provided at different locations as will be described later. And has the same function. Accordingly, reference numerals 31B and 32B are assigned to the first and second bent portions, respectively. 3 having the same functions as those of the components of the chassis 1A in FIG. 3 are denoted by the same reference numerals, and description thereof is omitted for the sake of simplicity.

  A first fixing hole 31a for fixing the chassis 1B is formed at the center of the connecting portion 313 of the first bent portion 31B. Similarly, a second fixing hole 32a for fixing the chassis 1B is formed in the center of the connecting portion 323 of the second bent portion 32B.

  The chassis 1B having such a structure is fixed at three points by screws (not shown) through the first to third fixing holes 31a to 33a. The first bent portion 31B is fixed to the left side wall (not shown) of the recording / reproducing apparatus with a screw through the first fixing hole 31a, and the second bent portion 32B is fixed through the second fixing hole 32a. The third bent portion 33A is fixed to the rear wall (not shown) of the recording / reproducing apparatus with a screw through the third fixing hole 33a. Is done.

  That is, in the illustrated chassis 1B, the first to third bent portions 31B, 32B, and 33A are supported by the three surfaces of the connecting portions 313 to 333, and are fixed at the three points of the first to third fixing holes 31a to 33a. Is done. In other words, each of the connecting portions 313 to 333 of the first to third bent portions 31B, 32B, and 33A serves as a support portion when fixing the chassis 1A.

  As described above, the chassis 1B is supported by the support portions (connecting portions) 313 to 333 having a larger area than the fixed portion, and the fixing holes 31a to 33a are provided at the centers of the support portions 313 to 333 at the fixed portions. Further, stress concentration can be reduced.

FIG. 6 shows an analysis result (von Mises stress) by simulation when the chassis 1B according to the second embodiment is fixed at the bent portions 31B, 32B, and 33A via the three fixing holes 31a to 33a. According to this analysis result, the result that the maximum stress value of 12.99 kgf / mm < ² > exists in the fixed location C of the 1st bending part 31B was obtained. That is, it can be seen that the maximum stress value of the chassis 1B according to the second embodiment is smaller than that of the chassis 1A according to the first embodiment.

  Moreover, since the fixed location itself of the chassis 1B remains at three points, the plane of the mounting portion 10 is maintained, and mounting distortion of the chassis 1B can be avoided.

  Although the present invention has been described with reference to preferred embodiments, it is obvious that various modifications can be made by those skilled in the art without departing from the spirit of the present invention.

It is a perspective view which shows the chassis of the conventional recording / reproducing apparatus. It is a perspective view which shows the analysis result (von Mises stress) by the simulation at the time of fixing the chassis shown in FIG. 1 with a bending piece through three fixing holes. It is a perspective view which shows the chassis of the recording / reproducing apparatus which concerns on the 1st Embodiment of this invention. It is a perspective view which shows the analysis result (von Mises stress) by the simulation at the time of fixing the chassis shown in FIG. 3 by a bending part via three fixing holes. It is a perspective view which shows the chassis of the recording / reproducing apparatus which concerns on the 2nd Embodiment of this invention. It is a perspective view which shows the analysis result (von Mises stress) by the simulation at the time of fixing the chassis shown in FIG. 5 by a bending part through three fixing holes.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1A, 1B Chassis 2 Drive part 10 Mounting part 11,12 Both ends of mounting part 13 One end of mounting part 31A, 31B 1st bending part 32A, 32B 2nd bending part 33A 3rd bending part 311, 312, 321 322, 331, 332 Rising part 313, 323, 333 Connecting part

Claims (3)

A chassis made of a metal plate that supports a drive unit of a recording / reproducing apparatus, the mounting unit on which the drive unit is mounted, and a first opposing surface formed by bending the metal plate at both ends of the mounting unit. And a chassis of a recording / reproducing apparatus, comprising: a second bent portion; and a third bent portion formed by bending the metal plate at one end of the mounting portion different from the both side ends.
Each of the first to third bent portions includes a pair of rising portions formed by bending the metal plate at a right angle apart from each other, and a connecting portion that connects ends of the pair of rising portions. A chassis of a recording / reproducing apparatus comprising:   A first fixing hole is provided in one rising portion of the first bent portion, a second fixing hole is provided in one rising portion of the second bent portion, and the third bent portion is connected. The chassis of the recording / reproducing apparatus according to claim 1, wherein a third fixing hole is provided at a center of the portion. A first fixing hole is provided in the center of the connecting portion of the first bent portion, a second fixing hole is provided in the center of the connecting portion of the second bent portion, and the third bent portion is connected. The chassis of the recording / reproducing apparatus according to claim 1, wherein a third fixing hole is provided at a center of the portion.

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