JP4193735B2 - Information recording / reproducing device - Google Patents

Description

  The present invention relates to an information recording / reproducing apparatus that drives an information medium to record and / or reproduce information.

  2. Description of the Related Art Conventionally, an information recording / reproducing apparatus that records or reproduces information by driving an information medium is widely known. For example, an optical disc reproducing apparatus rotates an optical disc that is an information medium, and irradiates a pit formed on the optical disc with a laser beam of an optical pickup to read the pit. Since the pits formed on the optical disk are very small, this optical pickup requires very high accuracy. If the optical pickup is shaken even slightly, a pit reading error, so-called bit loss, is caused, and sound reproduction characteristics are deteriorated.

  One of the causes of the optical pickup swinging is vibration generated when the information medium is driven. An information recording / reproducing apparatus usually has a drive unit that drives an information medium and a casing that houses the drive unit. And it mounts on a mounting base via the leg attached to the four corners of a housing | casing. Since the drive unit drives the information medium at a very high speed, vibration is generated by the drive motion itself. In addition, external vibrations may be transmitted from the mounting table via legs or a housing. Such vibrations generated in the drive unit cause shaking of the optical pickup, which in turn degrades the sound reproduction characteristics.

  Therefore, many techniques for reducing vibration generated in the drive unit have been proposed. For example, Patent Document 1 discloses an acoustic device in which the tip of a leg that supports a casing is formed in a conical spike shape. In this case, only the apex of the conical spike is brought into contact with the mounting table. However, in order to prevent the mounting table from being damaged by the conical spike, a plate material is usually interposed between the mounting table and the conical spike. According to the leg of the conical spike, the external vibration generated in the mounting table is difficult to be transmitted to the acoustic device because of the point contact with the mounting table, and the vibration of the drive unit can be reduced.

JP 2003-263874 A

  However, in the conical spike-shaped leg described in Patent Document 1, although the vibration caused by the external vibration can be reduced, the vibration caused by the driving of the information medium itself cannot be reduced. The legs are attached to the four corners of the casing, and the drive unit is disposed at the center of the casing. Therefore, the central portion where the drive unit is disposed is the part farthest from the leg, and is most likely to bend, and the drive unit is likely to be vibrated due to the deflection of the housing bottom plate. For this reason, the reproduction and recording characteristics of information are deteriorated.

  Accordingly, an object of the present invention is to provide an information recording / reproducing apparatus capable of reducing the vibration of the drive unit and improving the reproduction and recording characteristics.

An information recording / reproducing apparatus of the present invention is an information recording / reproducing apparatus that drives an information medium and records and / or reproduces information, and is used by being placed on a mounting table. A drive unit that drives an information medium for recording or reproducing information, a housing that houses the drive unit, and a plurality of legs that support the drive unit on the mounting table, and penetrates the bottom plate of the housing. And a plurality of legs that are screwed and fixed to the drive unit with the bottom plate sandwiched between the drive unit and the drive unit .

  In a preferred aspect, the leg has a point-like support portion that makes point contact with the mounting table. In another preferred aspect, the leg includes a vibration absorbing member that absorbs external vibration transmitted from the mounting table. In another preferred aspect, the wall member for hiding the leg is provided with a wall member standing between the bottom surface of the housing and the mounting table.

  Here, the information medium includes not only an optical disk such as a CD and a DVD but also a magnetic information medium such as a VTR.

  According to the present invention, since the leg is attached to the drive unit, the casing is directly supported by the leg. Therefore, the weight of the housing can be used as the load of the drive unit, and the inertia of the entire drive unit can be improved. Therefore, vibration due to driving of the information medium can be reduced, and consequently, reproduction and recording characteristics can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, a sound reproducing apparatus that reproduces sound by rotating an optical disk as an example is described. However, the present invention can be applied to other information recording / reproducing apparatuses by appropriately changing components.

  FIG. 1 is a front view of a sound reproducing device 10 according to an embodiment of the present invention. 2 is a longitudinal sectional view of the sound reproducing device 10, and FIG. 3 is a partially enlarged view thereof.

  The sound reproducing device 10 is normally used by being placed on a mounting table 22 such as an audio rack. The sound reproducing apparatus 10 includes a drive unit 12 that reads information by rotating and driving an information medium such as an optical disc, a housing 14 that houses the drive unit 12, and a leg body 16 that supports them. The housing 14 is a box-shaped member formed of a solid material or the like, and is attached to the drive unit 12 by legs 16.

  The drive unit 12 rotates an information medium such as an optical disk and irradiates the information medium with a laser beam to read pits formed on the optical disk or the like. The drive unit includes a main body 20 and a frame 18 that supports the main body 20. The frame 18 is made of a metal material such as aluminum.

  The drive unit 12 includes a spindle motor 19 that is a drive source for rotationally driving an optical disc, an optical pickup 21 that reads information from the optical disc by irradiating the optical disc with laser light, and the like. When the optical disk is driven to rotate, vibration generated from the spindle motor 19 in the drive unit 12 or vibration generated from the rotational motion of the optical disk itself is generated. This vibration adversely affects the reading of the pits and thus causes the acoustic characteristics to deteriorate. Therefore, in the present embodiment, the vibration generated in the drive unit 12 is reduced by arranging the leg 16 at a predetermined position.

  The drive unit 12 is supported by four legs 16 provided in total, two in the front and rear. The leg body 16 is roughly divided into a base portion 24 mounted on the mounting table 22 and a main portion 26 attached to the drive unit.

  The main part 26 of the leg 16 is composed of a fixing member 27 and a columnar member 28. The fixing member 27 is made of a solid material such as metal. And a point-like support portion 27c that comes into contact.

  The cylindrical member 28 is formed with a screw hole 28a screwed into the large-diameter screw portion 27b of the fixing member 27 at the center thereof, and a loose fitting screw for attaching a loose fitting screw 29 to the circumferential portion. A hole 28b is formed. When the loose-fitting screw 29 is screwed into the loose-fitting screw hole 28b, the head 29a of the loose-fitting screw 29 is extended to the lower side of the flange 24b of the base 24 described later. As a result, the head portion 29a of the loose fitting screw is in a state of preventing the base portion 24 from coming off, and the base portion 24 is integrated with the main portion 26 in a loose fitting state.

  The fixing member 27 of the main portion 26 thus configured is fixed by screwing the small diameter screw portion 27a through the bottom plate 14a of the housing 14 and the frame 18 of the drive unit 12. Further, the cylindrical member 28 of the main portion 26 is fixed by screwing a screw hole 28 a formed at the center thereof into a large-diameter screw portion 27 b of the fixing member 27.

  Accordingly, the main portion 26 of the leg 16 is attached to the frame 18 of the drive unit 12 with the bottom plate 14a of the housing 14 being sandwiched. In other words, the housing 14 is suspended from the drive unit 12 with the legs 16.

  Here, as described above, the drive unit 12 is vibrated by the rotational motion of the optical disk itself. Such vibration of the drive unit 12 leads to a decrease in pit reading accuracy, which in turn causes a decrease in reproduction characteristics.

  However, the vibration generated in the drive unit 12 can be reduced by attaching the leg 16 to the drive unit 12 and directly supporting the drive unit 12 with the leg 16 as in the present embodiment. That is, since the housing 14 is attached to the housing 14 with the legs 16, the weight of the housing 14 serves as a load of the drive unit 12. Thereby, the inertia of the whole drive unit 12 will improve, and it will become rigid with respect to a vibration. Further, conventionally, the force that causes the drive unit 12 to vibrate is transmitted to the leg body 16 via the housing 14 and pressed down. However, due to an assembly error between the drive unit 12 and the housing 14 and between the housing 14 and the leg body 16, a force that causes vibration is not reliably transmitted to the leg body 16, causing vibration. However, by attaching the leg 16 to the drive unit 12, the force causing the vibration is directly transmitted to the leg 16 and pressed down. Therefore, the vibration generated in the drive unit 12 itself can be reduced, and as a result, the reproduction characteristics can be improved.

  Conventionally, the drive unit 12 is disposed at the approximate center of the housing 14, and the legs 16 are attached to the four corners of the housing 14. Therefore, the center of the casing 14 in which the drive unit 12 is disposed is a portion where the bottom plate 14a is most flexible and vibration is likely to occur. However, in this embodiment, since the leg 16 is attached below the drive unit 12, the position where the drive unit 12 is disposed is less likely to bend. In addition, vibration due to deflection can be prevented, and the reproduction characteristics can be further improved.

  The base portion 24 is a substantially disk-shaped member formed as a separate member from the main portion 26. This is mounted on the mounting table 22, and a pedestal 24 a that receives the point-like support 27 c is formed at the center thereof. The pedestal portion 24a is a pedestal that protrudes from the disc-shaped base 24 body, and a conical recess that receives the point-like support portion 27c is formed at the center thereof. In addition, a collar portion 24b is formed on the circumference of the pedestal portion 24a so as to be engaged with the head portion 29a of the loose fitting screw 29.

  When the point-like support portion 27c of the main portion 26 is disposed on the pedestal portion 24a of the base portion 24, a gap is formed between the upper surface of the base portion 24 and the bottom surface of the cylindrical member 28, as can be seen from FIG. Therefore, it can be said that the main part 26 is connected to the mounting table 22 at the apex of the point-like support part 27c. By connecting the points in this way, external vibration generated in the mounting table 22 is difficult to be transmitted to the housing 14 and the drive unit 12, and as a result, it is possible to prevent the reproduction characteristics of the optical disk from being deteriorated.

  As described above, according to the present embodiment, the vibration generated in the drive unit can be reduced, so that the reproduction characteristics can be improved. In this embodiment, the leg 16 is provided with the conical point-like support portion 27c to support the drive unit 12 with a point, but it is not always necessary to support with a point. A normal, flat bottom body may be used. Further, a vibration absorbing member that absorbs external vibration generated on the mounting table on the leg, for example, an elastic member such as a spring may be provided to prevent transmission of external vibration.

  Moreover, in order to improve visual stability more, you may provide the wall member 42 for concealing the leg body 16 between the housing | casing 14 bottom face and the mounting base 22, as shown in FIG.4 and FIG.5. 4A is a perspective view of the false leg 40 whose side wall serves as the wall member 42, and FIG. 4B is a bottom view of the sound reproducing device 10 with the false leg 40 attached. The false leg 40 is attached to the leg body 16 in order to hide the leg body 16, and is a substantially elliptical bonnet member. The false leg 40 has such a dimension that the other corner is positioned at the corner of the housing 14 when the leg body 16 is housed in the corner. Further, the side wall 42 of the false leg 40 is slightly lower than the gap between the mounting table 22 and the bottom surface of the housing 14. Therefore, if the leg body 16 is stored in the false leg 40, the leg body 16 itself is hardly visible. Instead, the side wall 42 of the false leg 40 extending from the vicinity of the center of the housing 14 toward the corner can be seen. Therefore, when the sound reproducing device 10 is viewed from the front or side, the leg (false leg) appears to be from the center to the corner of the housing 14 and is visually stable. Of course, a leg body in which the shape of the leg body 16 itself extends to the corner of the casing 14 and the above-described false leg 40 and the leg body 16 are integrated may be used.

  Moreover, as shown in FIG. 5, you may provide the wall member 42 extended below from the bottom face of the housing | casing 14, ie, what is called a collar part. By providing such a collar portion 42, the leg body 16 can be hidden, and a visually stable feeling can be given when the sound reproducing device 10 is viewed from the front or side.

It is a front view of the state which mounted the sound reproduction apparatus which is embodiment of this invention in the mounting base. It is a longitudinal cross-sectional view of a sound reproducing device. FIG. 3 is a partially enlarged view of FIG. 2. (A) is a perspective view of a false leg, and (B) is a bottom view of the sound reproducing device to which the false leg is attached. It is a front view of the sound reproducing device provided with a buttock.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Sound reproduction apparatus, 12 Drive unit, 14 Housing | casing, 16 Leg, 18 Frame, 19 Spindle motor, 20 Drive unit main-body part, 21 Optical pick-up, 22 Mounting stand, 24 Main part, 24a Base part, 24 Base part, 26 Main part, 26b Dot-shaped support part, 28 female thread, 40 false leg, 42 wall member (false leg side wall, buttocks).

Claims (3)

An information recording / reproducing apparatus that drives an information medium and performs at least one of recording and reproduction of information,
A drive unit for driving the information medium;
A housing for storing the drive unit;
A plurality of legs that support the drive unit on the mounting table, and are fixed by being screwed into the drive unit with the bottom plate sandwiched between the drive plate and the bottom plate of the housing. Legs and
An information recording / reproducing apparatus comprising: The information recording / reproducing apparatus according to claim 1,
An information recording / reproducing apparatus, wherein the leg has a point-like support portion connected to the mounting table by a point. The information recording / reproducing apparatus according to claim 1 or 2,
An information recording / reproducing apparatus comprising a wall member standing between a bottom surface of a housing and a mounting table.

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