JP2826874B2 - Head guide member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention supports a head in a recording / reproducing apparatus for recording / reproducing information using a disk-shaped recording medium and guides the movement of the head. It relates to a head guide member.

[Conventional technology]

4 and 5 show an example of a conventional recording / reproducing apparatus which records information on a recording medium using a laser beam and reproduces the recorded information. In these figures, (1) indicates A motor (2) on which a disk-shaped recording medium (D) is placed and which is engaged with an output shaft to rotationally drive the recording medium (D); A head (3) for recording information on the recording medium (D) and reproducing the recorded information is provided. That is, a head moving space (4) having an open upper surface is formed in the chassis (1), and the head (3) is parallel to each other and spans both ends of the space (4). The pair of head guide members (5) are slidably mounted on the pair of head guide members (5), and are slidably guided substantially linearly along the guide members (5).

In such a configuration, each of the head guide members (5) is conventionally formed in a cylindrical shape, and is fitted to a metal bearing (3a) provided on the head (3) to slide the head (3). It is movably supported, as shown in FIG.
Both ends are supported on a supporting step (1a) formed on the chassis (1), and screws (6) are attached to the bottom wall of the step (1a).
And is fixed in a state of being pressed against one side wall of the step (1a) by the leaf spring (7) fixed.

[Problems to be solved by the invention]

However, the conventional configuration as described above has the following problems.

That is, as shown in FIG. 4, an objective lens (8) for focusing a laser beam on a predetermined position of a recording medium (D) is provided above the head (3). (8) When the recording medium (D) is rotated by the motor (2), the recording medium (D) is driven by a voice coil or the like in a horizontal arrow (x) direction and a vertical arrow (z) direction with respect to the recording medium (D). . Since the following operation of the objective lens (8) with respect to the recording medium (D) is performed up to a considerably high frequency of about 3 to 4 kHz, the objective lens (8) always vibrates at a high frequency.

However, the vibration reaction force of the objective lens (8) is transmitted to the head guide member (5) via the head (3), and is transmitted to the recording medium (D) via the chassis (1) and the motor (2). In this case, since the main constituent members of the head guide member (5), the chassis (1) and the motor (2) are made of metal, the vibrations are faithfully transmitted particularly. When the recording medium (D) vibrates in this way, since the objective lens (8) needs to be focused, a so-called positive feedback state in which the objective lens (8) tries to follow the vibration of the recording medium (D). At this time, for example, when disturbance of the natural frequency of the recording medium (D) is applied, the oscillation state is quickly reached, the control state of the objective lens (8) is broken, and the following operation to the recording medium (D) cannot be performed. There was a problem.

The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a head guide member that is devised so as to attenuate the transmission of vibration from the head to the chassis and prevent an oscillation state from occurring. Things.

[Means for solving the problem]

In order to achieve the above object, a head guide member according to the present invention includes a motor for mounting and rotating a disk-shaped recording medium, recording information on the recording medium, and reproducing information recorded on the recording medium. A recording / reproducing apparatus having a recording / reproducing head mounted on a chassis, wherein the rod-shaped guide member is disposed on the chassis and supports the recording / reproducing head so as to be substantially linearly movable. A main body made of a first material, and a supported part fixed to and supported by the chassis, the main body being made of a second material coupled to an end of the main body to attenuate vibration of the main body. It is characterized by having.

[Action]

When the recording / reproducing head vibrates due to the following operation on the recording medium when the recording medium is driven, the vibration reaction force of the head is transmitted to the main portion of the guide member. The material is effectively attenuated by the characteristics of the second material, and is hardly transmitted to the chassis. Therefore, no vibration is transmitted to the recording medium, or only negligible vibration is transmitted, so that the occurrence of the oscillation state can be suppressed.

〔Example〕

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Since the head guide member according to this embodiment is incorporated in a device having substantially the same configuration as the optical recording / reproducing device shown in the above-mentioned conventional example, FIG. 4 and FIG. 5, the description of the recording / reproducing apparatus will be omitted, and in the drawings showing this embodiment, parts having the same structure and operation as those of the conventional example will be denoted by the same reference numerals.

FIG. 1 shows a state in which a head guide member of this embodiment is supported on a supporting step (1a) of a chassis (1) in the above-mentioned recording / reproducing apparatus by using a leaf spring (7). The head guide member (5) is formed in a rod shape having a length extending between both side steps (1a) of the chassis (1), and has a main body (9) engaging with the recording / reproducing head (3). ,
The chassis (1) is connected to both ends of the main body (9).
And a pair of supported portions (10) that are supported and fixed to the main body. The main body (9) is formed of a hard metal as the first material, while the supported part (10)
Is formed of a resin having excellent vibration absorbing ability as a second material. And the supported part (10) made of this resin
Is supported on both side supporting steps (1a) of the chassis (1) in a mounted state, and is fixed in a pressed state to a side wall portion of the step (1a) by a leaf spring (7) fixed by screws (6). Is what is done.

FIG. 2 shows a coupling structure between the main body (9) of the head guide member (5) and the supported part (10). As shown in FIG. 2, both ends (only one end) of the main body (9) are shown. A small-diameter support shaft (9a) protrudes coaxially from the center of the illustrated portion, and a small-diameter through-hole (10a) is formed in the center of the supported portion (10) to form a support shaft (9a). The supported portion (10) is integrally connected to the main body (9) by fitting the through hole (10a) into the main body (9).

In the case of the head guide member (5) configured as described above,
The vibration transmitted from the head (3) is transmitted to the supported portion (5b) made of resin, but the vibration is greatly attenuated by the characteristics of the resin constituting the supported portion (5b), and the chassis is thereby attenuated. Vibration transmission to (1) is interrupted. Therefore, the motor (2) supported on the chassis (1)
The vibration is hardly transmitted to the recording medium (D) which is rotationally driven by the recording medium (D), and the recording medium (D) is rotationally driven stably, so that the follow-up operation of the head (3) is also stable, and the conventional The risk that an oscillation phenomenon occurs can be greatly suppressed.

Incidentally, in addition to the above-described embodiment, for example, as shown in FIG. 3 (A), as a coupling structure between the main body (9) of the head guide member (5) and the supported part (10), ), A recess (9b) is formed at the center of both ends (only one is shown), and a projection (10b) is formed at the center of the supported portion (10) on the side facing the main portion (9). Insert this projection (10b) into the recess (9
b) and integrally connected thereto, or as shown in FIG. 3 (B), the main body (9) is provided on the surface of the supported portion (10) facing the main body (9). A large-diameter bottomed cylindrical fitting part (10c) that fits into the end of the fitting part (10c) is formed.
Various modes are conceivable, such as one in which the main part (9) and the supported part (10) are integrally connected by fitting the c) to the end of the main part (9).

Further, in manufacturing the guide member (5) having the above-described main body (9) and supported part (10) coupling structure, the main part is placed in a resin molding die for manufacturing the supported part (10). By inserting a metal part constituting (9) and injecting a resin into the mold, the supported part (10) is inserted into the main part (9) simultaneously with the formation of the supported part (10). Can be combined.

Further, the first material forming the main body (9) is not limited to metal, but may be a material having a high rigidity such as ceramic. On the other hand, the first material forming the supported portion (10) may be used. In addition to resin, hard rubber and other materials having high shape-damping properties and high vibration damping ability can be considered as the material of No. 2.

〔The invention's effect〕

As described above, when using the head guide member of the present invention, a main body made of the first material that engages with the recording / reproducing head, and is coupled to an end of the main body to attenuate the vibration of the main body. Since the support member is made of the second material and is fixed to and supported by the chassis, the reaction force transmitted from the head that vibrates when the recording medium is driven is the second force that forms the support member. Is effectively attenuated by the characteristics of the material, and is hardly transmitted to the chassis. Therefore, no vibration is transmitted to the recording medium, or only negligible vibration is transmitted to the recording medium, so that the oscillation phenomenon of the recording / reproducing device can be suppressed, and the operation stability of the device can be significantly improved. It has an excellent effect that is not seen in the above.

[Brief description of the drawings]

FIG. 1 is an enlarged perspective view of a main part showing a state in which a head guide member according to one embodiment of the present invention is supported by a chassis of a recording / reproducing apparatus, and FIG. 2 is a main part and a supported part of the head guide member. 3 (A) and 3 (B) are enlarged cross-sectional views of a main part showing the coupling structure of FIG.
FIG. 4 is an enlarged sectional view of a main part showing a modified example of a coupling structure between a main part and a supported part of a head guide member, FIG. 4 is a perspective view of a main part of a general recording / reproducing apparatus, and FIG. Figure,
FIG. 6 is an enlarged perspective view of a main part showing a state in which a conventional head guide member is supported by a chassis of a recording / reproducing apparatus. (1) Chassis (2) Motor (3) Recording / reproducing head (5) Head guide member (9)
Main part, (10) supported part, (D) recording medium.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 61-6960 (JP, U) Japanese Utility Model Sho 59-161552 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB name) G11B 21/02

Claims (1)

(57) [Claims] 1. A motor for mounting and rotating a disk-shaped recording medium and a recording / reproducing head for recording information on the recording medium and reproducing the information recorded on the recording medium are mounted on a chassis. A recording / reproducing apparatus, wherein the rod-shaped guide member is disposed on the chassis and supports the recording / reproducing head so as to be substantially linearly movable; and a main body made of a first material engaged with the recording / reproducing head. And a supported portion fixed to and supported by the chassis and made of a second material that is coupled to an end of the main portion in substantially the same shape as the main portion and attenuates vibration of the main portion. A head guide member.