JPH07161151A - Recording/reproducing apparatus - Google Patents

Abstract

PURPOSE:To perform stable recording and reproduction of data by controlling the amount of vibration which is transmitted to the surface of a recording medium from the chassis side. CONSTITUTION:A spindle motor 2, a recording/reproducing head 5 and head guide rails 6, 7 are provided integrally on a chassis 1. A fitting strength of a head fitting portion 8a in the side of the spindle motor 2 for fixing the head guide rails 6, 7 on the chassis 1 is set smaller than that of the head fitting portion 8b in the opposite side of the spindle motor 2. Thereby, the fitting strength of the heading fitting portion near the spindle motor can be set flexible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus having a recording / reproducing head for recording / reproducing information on / from an optical information recording medium.

[0002]

2. Description of the Related Art FIG. 10 shows a configuration example of a conventional recording / reproducing apparatus. Spindle motor 2 on metal chassis 1
Is screwed on. This spindle motor 2 has
An optical disk 3 (see FIG. 11) as an optical information recording medium is mounted by being engaged with the output shaft thereof, and the optical disk 3 is thereby rotated. Opening 4 in chassis 1
A recording / reproducing head 5 for recording / reproducing information on / from the optical disc 3 is arranged in the space of the opening 4. The recording / reproducing head 5 is slidably attached to two head guide rails 6 and 7 arranged in parallel with each other in the space of the opening 4, and is slidably guided along the rail direction. Both ends of the head guide rails 6 and 7 are fixed by leaf springs 9 and screws 10 on head mounting portions 8a and 8b formed integrally with the chassis 1. An objective lens 11 is provided inside the recording / reproducing head 5 in order to focus the laser beam on the disc surface of the optical disc 3. The recording / reproducing head 5 is parallel to the disc surface during recording / reproduction. The drive is controlled in the direction X and the direction Z perpendicular to the direction. In this case, the follow-up operation of the objective lens 11 with respect to the optical disc 3 is performed up to a high frequency of about several KHz, which means that the objective lens 11 always vibrates at a high frequency.

[0003]

The vibration reaction force of the objective lens 11 vibrating at a high frequency in this way is transmitted to the head guide rail 6 through the recording / reproducing head 5, and the vibration is further transmitted to the head mounting portion 8a, 8b → chassis 1 → spindle motor 2 to transmit to optical disc 3. In this case, since the main constituent members of the head guide rail 6, the chassis 1, and the spindle motor 2 are "metal", there is a high probability that such vibrations will be faithfully transmitted.
For this reason, when the optical disc 3 vibrates at a natural frequency, the objective lens 11 moves to follow the vibration of the optical disc 3 to generate the same natural frequency as that of the optical disc 3, and the objective lens 11 further moves. The vibration generated in the lens 11 is transmitted to the optical disc 3 via the head guide rail 6, the chassis 1, etc., so that the so-called "positive feedback state" is entered. At this time, if some disturbance is applied to the optical disc 3, the optical disc 3 quickly falls into an oscillating state, and it becomes impossible to control the objective lens 11 to follow the optical disc 3.

As one means for solving such a problem, there is one disclosed in Japanese Patent Application Laid-Open No. 3-205662 under the name of "head guide member". 12
Shows a state of an assembly portion of the head guide member (note that the entire structure of the recording / reproducing head is shown in FIG.
The description is omitted because it is almost the same as 0). The round bar-shaped head guide member 12 is a main body 1 made of hard metal.
2a and a support portion 12b formed at both ends of the main body portion 12a and made of a resin material excellent in absorbing the vibration of the main body portion 12a. This head guide member 1
The second supporting portion 12b is installed on the convex head mounting portion 13 of the chassis 1, and is pressed by the leaf spring 14 to contact the screw 1
It is fixed on the surface of the chassis 16 by 5.

FIG. 2 shows the amount of transmission of the driving vibration of the objective lens 11 to the optical disk 3. First, in the case where the head guide rail 6 is firmly fixed to the head mounting portions 8a and 8b as shown in FIG. 10, the driving vibration of the objective lens 11 is caused by the head mounting portions 8a and 8b as shown in Graph A. Is transmitted to each part (chassis 1, spindle motor 2, etc.) with almost no attenuation at each part, and as a result, natural frequencies f1 to f3 potentially present in each part (the number of natural frequencies is the shape, material, and observation of each part). The transfer function has a peak at different frequencies.
As described above, when the peaks are present at the specific frequencies f1 to f3, the drive control of the objective lens 11 becomes impossible due to the resonance phenomenon. On the other hand, in the case as shown in FIG. 12 in which the head guide member 12 having the support portions 12b made of a resin material for damping vibrations at both ends is fixed to the head mounting portion 13, as shown in the graph B, The size of the peak of the transfer function becomes smaller than that in the case of the graph A, so that the resonance phenomenon can be suppressed and the drive control of the objective lens 11 can be performed.

However, the vibration of the recording / reproducing head 5 is suppressed by using the resin material that damps the vibration.
Even when not transmitting to the side (graph B), when the driving force of the motor for driving the objective lens 11 is strong or when the objective lens 11 is driven at high speed, the objective lens 11 has a large size. When a force is applied, the energy of vibration also increases, and the amount of vibration transmitted from the objective lens 11 to the recording / reproducing head 5 → head guide member 12 → chassis 16 → optical disk 3 also increases, and as a result, the amount of vibration cannot be suppressed. Therefore, stable recording and reproduction cannot be performed.

[0007]

According to a first aspect of the present invention, a spindle motor for rotating an optical information recording medium is mounted on a chassis, and an opening provided in the chassis at a position close to the spindle motor. A recording / reproducing head for recording / reproducing information on / from the optical information recording medium is disposed in the space of the optical information recording medium, and the recording / reproducing head is moved toward and away from the spindle motor in a plane parallel to the medium surface by a head guide rail. Is supported linearly movably in the direction in which the spindle motor, the recording / reproducing head and the head guide rail are mounted on the chassis by fixing both ends of the head guide rail to the head mounting portion of the chassis. In the recording / reproducing apparatus integrally provided with the spindle motor, the spindle motor for fixing the head guide rail onto the chassis. Mounting strength of the head attachment portion were set to be smaller than the attachment strength of the head attachment portion opposite the spindle motor.

According to a second aspect of the present invention, in the first aspect of the invention, the length of one side of the opening provided in the chassis, which is orthogonal to the head moving direction on the spindle motor side, is opposed to the one side. It is formed longer than the length of the other side opposite to the motor.

According to a third aspect of the invention, in the first aspect of the invention, the thickness of the chassis at the head mounting portion on the spindle motor side for fixing one end of the head guide rail is fixed to the other end of the head guide rail. The head mounting portion on the side opposite to the spindle motor is formed thinner than the plate thickness of the chassis.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the head attachment portion on the spindle motor side for fixing one end of the head guide rail is formed of a resin member, and the head attachment portion made of the resin member is formed. The head mounting portion was integrally mounted on the chassis by outsert molding in a mounting hole provided in the chassis.

According to a fifth aspect of the invention, in the first aspect of the invention, a plurality of slits are formed at one end of the head guide rail on the spindle motor side along the longitudinal direction of the rail.

According to a sixth aspect of the present invention, in the first aspect of the present invention, a through hole penetrating the rail in a direction orthogonal to the longitudinal direction of the rail is formed at one end of the head guide rail on the spindle motor side.

According to a seventh aspect of the invention, in the sixth aspect of the invention, a vibration damping member for damping the vibration of the rail is inserted into the through hole formed in the head guide rail.

According to an eighth aspect of the present invention, in the first aspect of the invention, the pressing force of the leaf spring provided on the head mounting portion on the spindle motor side for fixing one end of the head guide rail is adjusted by the pressing force of the head guide rail. It was set to be lower than the pressing force of a leaf spring provided on the head mounting portion on the side opposite to the spindle motor fixing the other end.

[0015]

According to the present invention, the amount of vibration of the recording / reproducing head and the head guide rail can be reduced by making the mounting strength of the head mounting portion closer to the spindle motor flexible. The rate at which lens vibration is transmitted to the chassis side via the head mounting part can also be relatively reduced, which allows the objective lens to be driven at high speed or use an objective lens drive motor with a strong driving force. Even when driven by the drive, the amount of vibration transmitted from the chassis to the optical information recording medium can be suppressed, and the resonance phenomenon at the time of recording / reproducing can be prevented.

According to the second aspect of the present invention, the length of one side of the opening near the spindle motor in the direction orthogonal to the head moving direction is increased so that the chassis is orthogonal to the head moving direction on the spindle motor side. The board width in the direction of can be shortened compared to the board width on the opposite side,
As a result, the amount of deformation of the head mounting portion on the spindle motor side when a force is applied in the direction perpendicular to the optical information recording medium surface becomes large, and the head mounting portion on the side where the deformation amount is large becomes flexible. Similar to the invention described in claim 1, it is possible to suppress the vibration amount and prevent the resonance phenomenon during recording and reproduction.

According to the third aspect of the present invention, the spindle motor in the case where a force is applied in the direction perpendicular to the optical information recording medium surface by reducing the thickness of the chassis at the head mounting portion near the spindle motor. The amount of deformation of the head mounting portion on the side becomes large, and the fixing of the head mounting portion on the side having the large amount of deformation becomes flexible, so that the vibration amount is suppressed and resonance at the time of recording / reproducing is performed as in the invention according to claim 1. It is possible to prevent the phenomenon.

According to a fourth aspect of the present invention, the head mounting portion on the side closer to the spindle motor is formed of a resin member by outsert molding and is formed integrally with the chassis, so that a direction perpendicular to the optical information recording medium surface is formed. The rigidity of the head mounting portion on the spindle motor side increases when a force is applied in the direction perpendicular to the optical information recording medium surface. Since the fixing is flexible, it is possible to suppress the amount of vibration and prevent the resonance phenomenon during recording and reproduction, as in the first aspect of the invention.

According to the present invention, a plurality of slits are formed in the rail direction at one end of the head mounting portion near the spindle motor, so that the rigidity in the direction perpendicular to the optical information recording medium surface is reduced. When the force is applied in the direction perpendicular to the surface of the optical information recording medium, the amount of deformation of the head mounting portion on the spindle motor side increases, and the head mounting portion on the side with the large amount of deformation flexibly fixes. Therefore, similarly to the invention described in claim 1, it is possible to suppress the vibration amount and prevent the resonance phenomenon during recording and reproduction.

According to the invention of claim 6, a plurality of through holes are formed in a direction orthogonal to the longitudinal direction of one end of the head mounting portion on the side closer to the spindle motor.
The rigidity in the direction perpendicular to the optical information recording medium surface can be reduced, and the amount of deformation of the head mounting portion on the spindle motor side when a force is applied in the direction perpendicular to the optical information recording medium surface becomes large. Since the fixing of the head mounting portion on the side where the amount is large becomes flexible, it is possible to suppress the amount of vibration and prevent the resonance phenomenon at the time of recording and reproducing as in the first aspect of the invention.

According to the seventh aspect of the present invention, by inserting the vibration damping member into the through hole, the rigidity of the head mounting portion on the spindle motor side in the direction perpendicular to the optical information recording medium surface can be further reduced. The effect of suppressing the vibration amount can be further enhanced as compared with the case of the invention according to claim 6.

According to the eighth aspect of the present invention, when the pressing force of the leaf spring in the head mounting portion near the spindle motor is set low, a force is applied in the direction perpendicular to the surface of the optical information recording medium. The amount of deformation of the head mounting part on the spindle motor side becomes large, and the fixing of the head mounting part on the side where this deformation amount is large becomes flexible,
Similar to the invention described in claim 1, it is possible to suppress the vibration amount and prevent the resonance phenomenon during recording and reproduction.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the invention described in claims 1 and 2 will be described with reference to FIGS. The description of the same parts as those of the recording / reproducing apparatus (see FIG. 10) described in the prior art is omitted, and the same parts are denoted by the same reference numerals.

In this embodiment, as shown in FIG. 1, a spindle motor 2, a recording / reproducing head 5, a head guide rail 6,
In the recording / reproducing apparatus in which 7 and 7 are integrally provided on the chassis 1, the mounting strength of the head mounting portion 8a on the side closer to the spindle motor 2 for fixing the head guide rails 6 and 7 on the chassis 1 is It was set smaller than the mounting strength of the head mounting portion 8b on the opposite side. Also,
Here, the length L ₁ of one side 4a of the opening 4 provided in the chassis 1 in the direction Y orthogonal to the head moving direction X on the side of the spindle motor 2 is the same as that of the side opposite to the spindle motor 2 facing the one side 4a. It was formed to be longer than the length L _{2 of} one side 4b (L ₁ > L ₂ ).

In such a structure, the head mounting portion 8a of the head guide rails 6 and 7 on the spindle motor 2 side.
The reason why the head is fixed flexibly and the head mounting portion 8b on the opposite side is firmly fixed will be described. Vibration transfer function G
(S) is expressed by the equation of motion as follows. {[K] + s ² [M]} {δ} = {F} (1) Here, if G (s) = 1 / {[K] + s ² [M]}, then G (s) = { δ} / {F} (2) [K]: System stiffness matrix [M]: System mass matrix {δ}: Vibration displacement vector {F}: Excitation force vector s: Laplace operator Now, head guidance When both ends of the rails 6 and 7 are flexibly fixed to the chassis 1 at the head mounting portions 8a and 8b, the recording / reproducing head 5 and the head guide rail 6 are almost independent of the chassis 1 in the formula (1). The value of the vibration displacement vector {δ} becomes the driving vibration force {F} of the objective lens 11, the transfer function G (s) composed of the recording / reproducing head 5 and the head guide rails 6 and 7, that is, [K]. , [M]. On the other hand, the head mounting portion 8a of the head guide rail 6 on the spindle motor 2 side is flexibly fixed to the chassis 1, and the head mounting portion 8b of the head guide rails 6 and 7 on the opposite side is fixed. Assuming that it is firmly fixed to the chassis 1, the value of the vibration displacement vector {δ} in the equation (1) is the driving vibration force {F} of the objective lens 11,
It is determined by the transfer function G (s), that is, [K], [M], which is composed of the recording / reproducing head 5, the head guide rails 6, 7 and the chassis 1. Thus, comparing the former case in which both are made “flexible” and the latter case in which only one is made “flexible”, when the objective lens 11 performs the same operation, the magnitude of the excitation force vector {F} is increased. However, in the latter case, the chassis 1 is involved, and as a result, the apparent value of [M] between the recording / reproducing head 5 and the head guide rails 6 and 7 becomes large, Even with the same excitation force vector {F}, the latter has a smaller value of the vibration displacement vector {δ}. Therefore, from such a situation, by fixing both of the head mounting portions 8a and 8b in a “flexible” manner, rather than fixing one head mounting portion 8a in a “flexible” manner, the recording / reproducing head 5 and the head guide The amount of vibration with the rails 6 and 7 becomes smaller,
The vibration amount of the vibration of the objective lens 11 transmitted to the chassis 1 via the head mounting portion 8a can also be relatively reduced. As a result, even if the objective lens 11 is driven at high speed or is driven by using an objective lens driving motor (not shown) having a strong driving force, the driving vibration of the objective lens 11 is transmitted to the optical disc 3. By suppressing the ratio of the amount, it is possible to prevent the resonance phenomenon at the time of recording / reproducing and stabilize the recording / reproducing operation. FIG. 2 shows the transfer function to the optical disc 3 due to the driving vibration of the objective lens 11 in comparison with the conventional case. It can be seen that the graph C according to the present embodiment has a remarkably smaller peak size of the transfer function than the graphs A and B of the conventional example, whereby the resonance phenomenon is almost completely suppressed. The objective lens 11 can be stably controlled. For the above reasons, one head mounting portion 8a
Only the head guide rails 6 and 7 are fixed'flexibly '.

Next, a specific example in which the head guide rails 6 and 7 are "flexibly" fixed only on one head mounting portion 8a will be described. The space formed by the opening 4 provided in the chassis 1 is formed so as not to interfere with the chassis 1 when the recording / reproducing head 5 moves, and is as small as possible in order to make the chassis 1 highly rigid. The shape is preferred. Therefore, with respect to the length L ₃ in the direction orthogonal to the moving direction X (rail direction) of the recording / reproducing head 5, the length L ₁ of the side 4a on the spindle motor 2 side and the length L of the side 4b opposite thereto. Form ₂ slightly longer. In this case, the length L ₂ is set to be the minimum length necessary for preventing the interference with the chassis 1 when the recording / reproducing head 5 is moved to one end, and the length L ₁ is set to be longer than the length L ₂ . By thus determining the shape of the opening 4, the plate width La in the direction Y orthogonal to the rail direction X on the spindle motor 2 side of the chassis 1 can be made shorter than the plate width Lb on the opposite side, As a result, the amount of deformation when the force is applied in the direction Z perpendicular to the optical disk surface is larger in the head mounting portion 8a than in the head mounting portion 8b.
For this reason, the head guide rails 6, 7 are provided in the head mounting portion 8a on the spindle motor 2 side where the deformation amount is large.
Is fixed “flexibly”, and conversely, the head guide rail 6 is fixed “rigidly” at the head mounting portion 8b on the opposite side of the spindle motor 2 with a small deformation amount, so that the driving vibration of the objective lens 11 is caused. Can be suppressed as much as possible from being transmitted to the optical disc 3 side through the chassis 1. Therefore, the effect of preventing the resonance phenomenon at the time of recording / reproducing can be enhanced by this, and a stable recording / reproducing operation can be performed.

Next, an embodiment of the invention described in claim 3 will be described with reference to FIGS. 3 and 4. The description of the same parts as those in the first and second aspects of the present invention is omitted, and the same parts are designated by the same reference numerals.

3 and 4 are views of the chassis 1 of the recording / reproducing apparatus (see FIG. 1) described in the first aspect of the present invention, as viewed from the back side. In this embodiment, in such a recording / reproducing apparatus, the plate thickness W ₁ of the chassis 1 at the head mounting portion 8a on the spindle motor 2 side for fixing one end of the head guide rails 6 and 7 is set to the head guide rails 6 and 7. It is formed to be thinner than the plate thickness W ₂ of the chassis 1 in the head mounting portion 8b opposite to the spindle motor 2 for fixing the other end (W ₁ <W ₂ ).

With this structure, when a force is applied in the direction perpendicular to the optical disk surface, the thin head mounting portion 8a of W ₁ has a thicker head mounting portion 8b of W _2. The amount of deformation is larger than that. For this reason, the head mounting portion 8a having a large deformation amount is fixed “flexibly” and the head mounting portion 8b having a small deformation amount is “rigidly” fixed. It is possible to enhance the effect of suppressing the transmission to the optical disc 3 side via 1. As a result, the effect of preventing the resonance phenomenon at the time of recording / reproducing can be enhanced, and a stable recording / reproducing operation can be performed.

Next, an embodiment of the invention described in claim 4 will be described with reference to FIG. The description of the same parts as those in the first to third aspects of the present invention is omitted, and the same parts are designated by the same reference numerals.

In this embodiment, in the recording / reproducing apparatus described in the first aspect of the invention, the head mounting portion 8a on the spindle motor 2 side for fixing one end of the head guide rail 6 is:
The mounting hole 12 provided in the chassis 1 is formed by outsert molding using a resin member 13. By such outsert molding, the head mounting portion 8a
Will be integrally formed with the chassis 1. The head mounting portion 8b on the side opposite to the spindle motor 2 is integrally formed of the same metal as that of the chassis 1 (in addition to this, a material having high rigidity such as ceramics), as in the past.

With such a structure, the rigidity of the resin and the metal is generally higher than that of the metal. Therefore, the head mounting portion 8a made of the resin member 13 and the head mounting portion made of the metal are formed. When the head guide rails 6 and 7 are fixed to 8b and a force is applied in the direction Z perpendicular to the optical disk surface, the deformation amount of the head mounting portion 8a made of the resin member 13 is larger than that of the head mounting portion 8b made of metal. large. As a result, the head mounting portion 8a having a large deformation amount is fixed “flexibly” and the head mounting portion 8b having a small deformation amount is fixed “rigidly”, so that the driving vibration of the objective lens 11 is reduced. The effect of suppressing transmission to the optical disc 3 side via the chassis 1 can be enhanced. As a result, the effect of preventing the resonance phenomenon at the time of recording / reproducing can be enhanced, and stable recording / reproducing operation can be performed.

Next, an embodiment of the invention described in claim 5 will be described with reference to FIG. The description of the same parts as those in the first to fourth aspects of the present invention is omitted, and the same parts are designated by the same reference numerals.

In this embodiment, in the recording / reproducing apparatus described in the first aspect of the invention, the head mounting portion 8a of the head guide rails 6 and 7 made of a material having high rigidity such as metal or ceramics on the spindle motor 2 side. A plurality of slits 14 are formed along the longitudinal direction X of the rail at one end fixed to the. The slit 14 is formed with a length (depth) S about the diameter of the head guide rails 6, 7 and a height T about a fraction of this S.

With this structure, the ends of the head guide rails 6 and 7 having the slits 14 on the spindle motor 2 side have low rigidity in the direction Z perpendicular to the optical disk surface. Therefore, when the head guide rails 6 and 7 are fixed to the head mounting portions 8a and 8b, the head mounting portion 8a is more likely to be deformed in the Z direction.
From this, the head mounting portion 8 with a large deformation amount
The drive vibration of the objective lens 11 is transmitted to the optical disc 3 side via the chassis 1 because it is fixed “flexibly” at “a” and “strong” at the head mounting portion 8b with a small deformation amount. The effect of suppressing can be enhanced. As a result, the effect of preventing the resonance phenomenon at the time of recording / reproducing can be enhanced, and stable recording / reproducing operation can be performed.

Next, an embodiment of the invention described in claims 6 and 7 will be described with reference to FIGS. 7 and 8. In addition, claim 1
The description of the same parts as those of the invention described in 5 is omitted, and the same reference numerals are used for the same parts.

In this embodiment, in the recording / reproducing apparatus described in the first aspect of the invention, as shown in FIG. 7, a spindle motor for head guide rails 6 and 7 made of a material having high rigidity such as metal or ceramics. 2 side head attachment part 8
A plurality of through holes 15 were formed at one end fixed to a along the direction Y orthogonal to the longitudinal direction X of the rail. The cross-sectional area of the through hole 15 is equal to the head guide rails 6, 7
The size is about a fraction of the area of the cross section in the direction Y orthogonal to the rail. The cross section is formed in a substantially circular shape or a polygonal shape. Further, as shown in FIG. 8, the space of the through hole 15 may be filled with rubber 16 as a vibration damping member. The vibration damping member is not limited to the rubber 16 and may be any substance having a high effect of damping vibration.

With this structure, the ends of the head guide rails 6, 7 having the through holes 15 filled with the cavities or the rubber 16 on the spindle motor 2 side are in the direction Z perpendicular to the optical disk surface. And the rigidity is low. For this reason,
When the head guide rails 6 and 7 are fixed to the head mounting portions 8a and 8b, the head mounting portion 8a becomes easier to deform in the Z direction. From this, the head mounting portion 8a with a large deformation amount is fixed “flexibly” and the head mounting portion 8b with a small deformation amount is fixed “rigidly”, so that the driving vibration of the objective lens 11 causes the chassis 1 to move. It is possible to enhance the effect of suppressing the transmission to the optical disc 3 side via the optical disc. It should be noted that the effect of suppressing vibration can be further enhanced by filling the rubber 16 rather than the cavity. As a result, the effect of preventing the resonance phenomenon at the time of recording / reproducing can be further enhanced, and a more stable recording / reproducing operation can be performed.

Next, an embodiment of the present invention will be described with reference to FIG. The description of the same parts as those in the first to seventh aspects of the invention is omitted, and the same parts are denoted by the same reference numerals.

In this embodiment, in the recording / reproducing apparatus described in the first aspect of the invention, the head mounting portion 8a on the spindle motor 2 side for fixing one end of the head guide rails 6, 7 is provided.
The pressing force F1 of the leaf spring 9 is set to be lower than the pressing force F2 of the leaf spring 9 on the head mounting portion 8b on the opposite side of the spindle motor 2 that fixes the other ends of the head guide rails 6 and 7 (F1 <F2 ). 9 (a) and 9 (b) show a specific example thereof, FIG. 9 (a) shows the structure of the head mounting portion 8a on the spindle motor 2 side, and FIG. 9 (b).
Shows the structure of the head mounting portion 8b on the opposite side of the spindle motor 2. Since the thickness E ₁ of the leaf spring 9 of (a) is formed thinner than the thickness E ₂ of the leaf spring 9 of (b), the force for elastically fixing the head guide rails 6, 7 is F2 of the head mounting portion 8b. Is the head mounting part 8a
It becomes larger than F1 of. For this reason, the head mounting portion 8a having a weaker elastic pressure fixing force is fixed “flexibly”, and the head mounting portion 8b having a stronger elastic pressure fixing force is fixed “strong”.
It is possible to enhance the effect of suppressing the drive vibration of (1) transmitted to the optical disk 3 side through the chassis 1. As a result, the effect of preventing the resonance phenomenon at the time of recording / reproducing can be enhanced, and stable recording / reproducing operation can be performed.

[0041]

According to the first aspect of the present invention, a spindle motor for rotating an optical information recording medium is mounted on a chassis, and the space is provided in an opening provided in the chassis at a position close to the spindle motor. A recording / reproducing head for recording / reproducing information on / from the optical information recording medium is arranged,
The recording / reproducing head is linearly movably supported by a head guide rail in a direction parallel to and away from the spindle motor in a plane parallel to the medium surface, and both ends of the head guide rail are heads of the chassis. A recording / reproducing apparatus in which the spindle motor, the recording / reproducing head, and the head guide rail are integrally provided on the chassis by fixing the spindle motor to the mounting portion. Since the mounting strength of the head mounting portion on one side is set to be smaller than the mounting strength of the head mounting portion on the side opposite to the spindle motor, the vibration amount of the recording / reproducing head and the head guide rail can be reduced, and the objective The ratio of lens vibration transmitted to the chassis via the head mount is also relatively It can cause lack. This suppresses the amount of vibration transmitted from the chassis to the optical information recording medium even when the objective lens is driven at high speed or using an objective lens driving motor having a strong driving force, and recording / reproducing Since the resonance phenomenon can be prevented, stable recording and reproduction can be always performed.

According to a second aspect of the present invention, in the first aspect of the present invention, the length of one side of the opening provided in the chassis, which is orthogonal to the head moving direction on the spindle motor side, is opposed to the one side. Since it is formed longer than the length of the other side on the side opposite to the motor, the plate width in the direction orthogonal to the head movement direction on the spindle motor side of the chassis can be made shorter than the plate width on the opposite side. When a force is applied in the direction perpendicular to the surface of the optical information recording medium, the amount of deformation of the head mounting portion on the side closer to the spindle motor increases, and since this amount of deformation is large, the head mounting portion on the side closer to the spindle motor is fixed. Can be made flexible, and similarly to the first aspect of the invention, the effect of suppressing the amount of vibration can be enhanced, and stable recording and reproduction can be always performed.

According to a third aspect of the present invention, in the first aspect of the invention, the thickness of the chassis at the head mounting portion on the spindle motor side for fixing one end of the head guide rail is fixed, and the other end of the head guide rail is fixed. Since the head mounting portion on the side opposite to the spindle motor is formed thinner than the thickness of the chassis, deformation of the head mounting portion on the side closer to the spindle motor when a force is applied in a direction perpendicular to the optical information recording medium surface. The amount of deformation is large, and since the amount of deformation is large, it is possible to flexibly fix the head mounting portion on the side closer to the spindle motor.
Similar to the invention described above, the effect of suppressing the amount of vibration can be enhanced, and stable recording and reproduction can be always performed.

According to a fourth aspect of the present invention, in the first aspect of the invention, the head mounting portion on the spindle motor side for fixing one end of the head guide rail is formed of a resin member, and the head mounting portion made of this resin member is formed. Since the head mounting portion is integrally mounted on the chassis by outsert molding in the mounting hole provided in the chassis, the head mounting portion near the spindle motor has low rigidity, and the head surface of the optical information recording medium surface is reduced. When a force is applied in the vertical direction, the amount of deformation of the head mounting portion on the side closer to the spindle motor increases, and since this amount of deformation is large, it is possible to flexibly fix the head mounting portion on the side closer to the spindle motor. Therefore, as in the first aspect of the invention, the effect of suppressing the vibration amount can be enhanced, and stable recording and reproduction can be always performed.

According to a fifth aspect of the present invention, in the first aspect of the invention, a plurality of slits are formed at one end of the head guide rail on the spindle motor side along the longitudinal direction of the rail, so that the head guide rail is close to a spindle motor. Since the head mounting portion on the side has low rigidity, the amount of deformation of the head mounting portion on the side closer to the spindle motor is large when a force is applied in the direction perpendicular to the optical information recording medium surface. It is possible to flexibly fix the head mounting portion on the side closer to the spindle motor, enhance the effect of suppressing the amount of vibration, and perform stable recording / reproducing at all times, as in the first aspect of the invention.

According to a sixth aspect of the present invention, in the first aspect of the present invention, a through hole penetrating the rail in a direction orthogonal to the longitudinal direction of the rail is formed at one end of the head guide rail on the spindle motor side. The rigidity of the head mounting part near the spindle motor becomes low, and the amount of deformation of the head mounting part near the spindle motor increases when a force is applied in the direction perpendicular to the optical information recording medium surface. Is large, the head mounting part near the spindle motor can be fixed flexibly,
As in the case of the first aspect of the invention, the effect of suppressing the vibration amount can be enhanced, and stable recording / reproducing can be always performed.

According to a seventh aspect of the invention, in the sixth aspect of the invention, a vibration damping member for damping the vibration of the rail is inserted into the through hole formed in the head guide rail. In this case, the effect of suppressing the vibration amount can be further enhanced.

According to an eighth aspect of the present invention, in the first aspect of the present invention, the pressing force of a leaf spring provided on the head mounting portion on the spindle motor side for fixing one end of the head guide rail is controlled by the head guide rail. Since the pressing force of the leaf spring provided on the head mounting portion opposite to the spindle motor fixing the other end is set to be lower, the pressing force of the leaf spring on the head mounting portion closer to the spindle motor is smaller. Therefore, when a force is applied in the direction perpendicular to the optical information recording medium surface, the amount of deformation of the head mounting portion on the side closer to the spindle motor increases, and since this amount of deformation is large, the head mounting portion on the side closer to the spindle motor. Can be flexibly fixed, and like the invention according to claim 1, the effect of suppressing the vibration amount can be enhanced, and stable recording and reproduction can be always performed. .

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a recording / reproducing apparatus which is an embodiment of the invention described in claims 1 and 2.

FIG. 2 is a characteristic diagram showing a transfer function to an optical disc when the objective lens is driven and vibrated.

FIG. 3 is a perspective view of a recording / reproducing apparatus showing an embodiment of the invention according to claim 3 as seen from the back side.

FIG. 4 is a vertical cross-sectional side view showing a state where the chassis of the recording / reproducing apparatus is cut along the rail direction.

FIG. 5 is a vertical cross-sectional side view showing the configuration of an outsert-molded head mounting portion that is an embodiment of the invention as set forth in claim 4;

FIG. 6 is a perspective view showing a slit shape of a head guide rail which is an embodiment of the invention according to claim 5;

FIG. 7 is a perspective view showing a shape of a through hole of a head guide rail according to an embodiment of the present invention.

FIG. 8 is a perspective view showing a shape of a vibration damping member of a head guide rail according to an embodiment of the invention as set forth in claim 7;

FIG. 9 is a view showing a shape of a leaf spring in a head mounting portion which is an embodiment of the invention according to claim 8;
Is a side view showing how a thin plate spring is used,
(B) is a side view showing a state in which a thick plate spring is used.

FIG. 10 is a perspective view showing a configuration of a conventional recording / reproducing apparatus.

11 is a vertical cross-sectional side view showing a state where the chassis portion of the recording / reproducing apparatus of FIG. 10 is cut along the rail direction.

FIG. 12 is a perspective view showing a configuration example of a conventional head mounting portion.

[Explanation of symbols]

 1 Chassis 2 Spindle Motor 3 Optical Information Recording Medium 4 Opening 5 Recording / Reproducing Head 6, 7 Head Guide Rails 8a, 8b Head Mounting Part 9 Leaf Spring 12 Mounting Hole 13 Resin Member 15 Through Hole 16 Vibration Damping Member

Claims (8)

[Claims] 1. A spindle motor for rotating an optical information recording medium is mounted on a chassis, and information is transmitted to the optical information recording medium in a space of an opening provided in the chassis at a position close to the spindle motor. A recording / reproducing head for recording / reproducing is arranged, and the recording / reproducing head is linearly supported by a head guide rail in a direction parallel to and away from the spindle motor in a plane parallel to the medium surface. By fixing both ends of the head guide rail to a head mounting portion of the chassis, in the recording / reproducing apparatus in which the spindle motor, the recording / reproducing head, and the head guide rail are integrally provided on the chassis, The mounting strength of the head mounting portion on the spindle motor side for fixing the guide rail on the chassis is The recording / reproducing apparatus is characterized in that the setting is made smaller than the mounting strength of the head mounting portion on the side opposite to the spindle motor. 2. The length of one side of the opening provided in the chassis, which is orthogonal to the head moving direction on the spindle motor side, is formed longer than the length of the other side opposite to the spindle motor facing the one side. The recording / reproducing apparatus according to claim 1, wherein 3. The thickness of the chassis at the head mounting portion on the spindle motor side for fixing one end of the head guide rail to the thickness of the chassis at the head mounting portion on the side opposite to the spindle motor for fixing the other end of the head guide rail. The thin film is formed thinner than the plate thickness.
The recording / reproducing apparatus described. 4. A head mounting portion on the spindle motor side for fixing one end of the head guide rail is formed of a resin member, and the head mounting portion made of this resin member is outsert-molded into a mounting hole provided in the chassis. The recording / reproducing apparatus according to claim 1, wherein the head mounting portion is integrally mounted on the chassis. 5. The recording / reproducing apparatus according to claim 1, wherein a plurality of slits are formed in one end of the head guide rail on the spindle motor side along the longitudinal direction of the rail. 6. A through hole penetrating the rail in a direction orthogonal to the longitudinal direction of the rail is formed at one end of the head guide rail on the spindle motor side.
The recording / reproducing apparatus described. 7. The recording / reproducing apparatus according to claim 6, wherein a vibration damping member for damping the vibration of the rail is inserted into a through hole formed in the head guide rail. 8. A head mounting on a side opposite to the spindle motor for fixing the other end of the head guide rail to a pressing force of a leaf spring provided on a head mounting portion on the spindle motor side for fixing one end of the head guide rail. The recording / reproducing apparatus according to claim 1, wherein the recording / reproducing apparatus is set to have a pressure lower than a pressing force of a leaf spring provided in the section.