JPH0589478A - Optical head moving device - Google Patents

Abstract

PURPOSE:To expand the movable range of an inner circumference side, and to prevent the transmission of resonance to an optical recording medium, etc., and to shield a ball to constitute a guide means. CONSTITUTION:A fixed plate 8 and a movable plate 7 fixed with a movable unit 6 are provided with a pair of first recessed parts 7b and a pair of second recessed parts 8b which are opposed to each other and extend to a direction X. The balls 9 are fitted so as to be capable of rolling between the first recessed parts 7b and the second recessed parts 8b to the direction X while being held rotatably by retainers 9a. The fixed plate 8 is fixed to an optical recording and reproducing device main body by a fitting hole 8a. A retainer lock 10 is provided with a shield cover part 10c to cover the ball 9. A guide shaft having been fixed in the vicinity of a motor 3 in the past is eliminated, and the movable range of the inner circumference side can be expanded, and the transmission of the resonance to be transmitted through the guide shaft can be prevented. The ball 9 is shielded, and the entering of dust or the spattering of grease can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical head transfer device for transferring an optical head of an optical recording / reproducing device for recording / reproducing or erasing information by condensing it on an information track formed on an optical recording medium. Is.

[0002]

2. Description of the Related Art In recent years, an optical recording / reproducing device has been attracting attention as a high-density and large-capacity memory.

Conventionally, an optical head transfer device of an optical recording / reproducing apparatus has a plurality of means as a means for guiding the movement of a movable unit having an objective lens for focusing a light beam on an arbitrary information track of an optical recording medium. A structure including a ball bearing and a guide shaft is commonly used.

For example, Japanese Patent Application Laid-Open No. 62-26676 proposes an optical head transfer device of the type in which a carriage for mounting a movable unit is constructed and the movable unit is moved together with the carriage.

An example of a conventional optical head transfer device will be described below with reference to the drawings. FIG. 17 shows a conventional optical head transfer device.

In FIG. 17, the X direction is a direction orthogonal to an information track of an optical recording medium (not shown) (hereinafter referred to as a tracking direction), and the Z direction is a direction perpendicular to the optical recording medium (hereinafter referred to as focus). Direction), the Y direction is a direction perpendicular to both the X direction and the Z direction, and is the tangential direction (hereinafter referred to as the jitter direction) of the information track of the optical recording medium.

In FIG. 17, 101 is a carriage,
A movable unit 105 described later is mounted. 102
Guide shafts a and 102b are provided on both sides of the carriage 101 to guide the carriage 101. 103
a and 104a are ball bearings, which are the carriage 101.
It is provided on one of the side surfaces and is arranged so as to be rollable symmetrically with respect to the guide shaft 102a in the Y direction. Reference numeral 103b denotes a ball bearing, although only one ball bearing is shown, there is another ball bearing, which is provided on one side surface of the carriage 101 in the Y direction with respect to the guide shaft 102a, like the ball bearings 103a and 104a. It is symmetrically arranged so that it can roll. 103c, 104
Reference numeral c is a ball bearing, which is provided on the other side surface of the carriage 101 and is arranged so as to be rollable symmetrically with respect to the guide shaft 102b in the Y direction. Reference numeral 105 denotes a movable unit, which performs control (focus control and tracking control) such that an objective lens that focuses a light beam on an information track of an optical recording medium and a focus of the focused light beam follow a recording surface of the information track. Therefore, an actuator or the like for driving the objective lens in the ± Z direction and the ± X direction is configured. Reference numeral 106 denotes an optical recording / reproducing apparatus main body, which is a guide shaft 102.
Both ends of a and 102b are fixed.

Reference numeral 107 denotes a mounting shaft, which is a mounting shaft for the ball bearing 104c at a position where the weight of the carriage 101 is not applied (the gravity direction is set in the-(minus) Z direction or + Y direction). Is fixed to the inner ring 104c1 of the ball bearing 104c. 1
Reference numeral 08 denotes a support hole provided on the carriage 101.
Reference numeral 109 denotes an annular rubber elastic material, which is fitted into the support hole 108 and supports the other end of the mounting shaft 107.

The operation of the conventional optical head transfer device constructed as described above will be described.

When a current flows through a coil of a linear motor (not shown) which is a transfer means connected to the carriage 101 according to an instruction from a controller (not shown), the carriage 1
The driving force in the ± X direction acts on 01. Therefore, when the target information track of the movable unit 105 is determined,
An electric current flows through the coil of the linear motor according to an instruction from the control unit, and the driving force of the linear motor controls the carriage 101 and hence the movable unit 105 so as to reach a target information track in the + X direction or the − (negative) X direction. Moving.

[0011]

However, in the conventional structure, although the motor for mounting the optical recording medium and rotationally driving it is not shown, it is necessary to configure it on the − (minus) X direction side or the + X direction side. In addition, since one end of each of the guide shafts 102a and 102b must be fixed near the motor, the movable stroke of the movable unit 105 near the motor, that is, on the inner peripheral side is limited,
Further, the guide shafts 102a and 102b are provided near the motor.
Since one end of each is fixed, the resonance of the optical recording medium (mechanical natural vibration) and the resonance of the motor are caused by the guide shaft 1.
02a, 102b from one end of the guide shaft 102a, 102
b to the carriage 101 and then to the movable unit 105 to make high-precision control difficult, and conversely, the resonance of the movable unit 105 and the resonance of the carriage 101 are transmitted to the optical recording medium via the opposite routes. The first problem is that it makes it difficult to perform highly accurate control.

In view of the above-mentioned first problem, the present invention has a first object that the movable stroke on the inner peripheral side of the movable unit is enlarged and the harmful resonance is hardly transmitted to the optical recording medium or the movable unit. (EN) Provided is an optical head transfer device having high efficiency.

Further, in the conventional structure, the guide shaft 1
02a, 102b, ball bearing, carriage 10
Although not shown in the figure, it is considered that the optical path of the light beam is configured inside the movable unit 105, and the movable unit 1 is mounted on the carriage 101.
Therefore, the movable unit 105 in which the optical path of the light beam is formed and the guide means are completely separate from each other, and the carriage 101 in the Z direction is mounted.
Therefore, both the height as the guide means and the height of the movable unit 105 are required, so that there is the second problem that the optical recording / reproducing apparatus cannot be made thin.

In view of the above-mentioned second problem, the present invention has as a second object to provide an optical head transfer device which enables a thin optical recording / reproducing device.

Further, in the conventional structure, the guide shaft 1
02a, 102b, ball bearing, carriage 10
Although the guide means is configured by 1 etc., the parts themselves that enable linear movement, that is, the parts required for rolling motion are only the guide shaft and the ball bearings, but other than that, the mounting shaft that holds the ball bearings. Since a carriage and the like are required, there is a third problem that not only the number of parts is increased but also the mass of the entire movable portion is increased.

In view of the above-mentioned third problem, the present invention has as a third object to provide an optical head transporting device which has a small number of parts and which can reduce the weight of the entire movable part.

In the conventional structure, although not shown, it is considered that the optical path of the light beam is formed inside the movable unit 105, and the support center of the guide means, that is, the guide shafts 102a and 102b in the Z direction. Since the center of the light beam is separated from the center of the light beam set inside the movable unit 105, for example, when vibration or shock is applied to the device and the guide means vibrates, rolling motion around the Y direction around the support center of the guide means. Occurs, and the light beam is further amplified and vibrated, which causes a problem.

In view of the above-mentioned fourth problem, the present invention has as a fourth object to provide an optical head transporting device which operates stably against vibration and the like.

Further, in the above conventional example, the movable unit is ± X.
The position of the linear motor as the transfer means for driving in the direction is not shown, but since the support center of the guide means and the center of the driving force of the linear motor as the transfer means are generally apart, a moment is generated and smooth. It had the fifth problem that it could not be driven in a proper manner.

In view of the fifth object of the present invention, as a fifth object, the present invention provides an optical head transfer device capable of smoothly driving a movable unit without generating a moment due to the driving force of the transfer means.

Further, in general, at least one of the center of support of the guide means, the center of gravity of the entire movable portion, and the center of the driving force of the transfer means is separated from the other two center positions. Since the ideal drive cannot be performed and the frequency of the natural vibration of the drive system is lowered, the control system becomes unstable due to the natural vibration when trying to control the transfer means at high speed with high accuracy. I had.

As a sixth object of the present invention, in view of the above-mentioned sixth problem, an optical head transfer device which improves the frequency of the natural vibration of the transfer means and enables high-speed and highly accurate control of the transfer means is provided. To do.

In the above-mentioned conventional example, the guide means is composed of two guide shafts, six ball bearings and their mounting shafts, one carriage, and the like.
The seventh problem was that the number of parts was extremely large and assembly and adjustment were troublesome.

In view of the above-mentioned seventh object, the present invention achieves at least one of the first, second, fourth, fifth and sixth objects as a seventh object, and at the same time, (EN) An optical head transfer device which has a small number of parts, is easy to assemble and adjust and is inexpensive.

Further, as will be described later in detail, in the guide means constituted by the movable plate, the fixed plate and the ball as in the present invention, the gap between the movable plate and the fixed plate is conventionally open,
Since the ball is exposed to the outside, if this guide means is adopted in the optical head transfer device, dust will enter from the outside and the load during transfer will increase, and the grease filled for ball lubrication will scatter. The eighth problem is that it adheres to a recording medium or the like.

In view of the eighth object of the present invention, as an eighth object, the present invention covers a portion where the ball is exposed to the outside to prevent dust from entering from the outside or to apply grease to an optical recording medium or the like. It is intended to provide a highly reliable optical head transfer device that prevents the scattering of light.

The present invention also has an eighth object as a ninth object.
(EN) An optical head transfer device which achieves the above object and at the same time makes it possible to reduce the weight of a movable part.

The present invention, as a tenth object, achieves the eighth object without increasing the number of parts, and provides an inexpensive optical head transfer device.

Further, the present invention, as the eleventh object, achieves the ninth object without increasing the number of parts, and provides an inexpensive optical head transfer device.

[0030]

In order to achieve the first object, the first structure of the optical head transfer device of the present invention is an objective lens for converging a light beam on an arbitrary information track of an optical recording medium. The movable unit includes a movable unit, a transfer unit that generates a driving force for moving the movable unit in the tracking direction, and a guide unit that movably supports the movable unit in the tracking direction. It is fixed to the fixed part of the optical recording / reproducing apparatus on both sides.

In order to achieve the second object, the second structure of the optical head transfer device of the present invention is a movable unit having an objective lens for converging a light beam on an arbitrary information track of an optical recording medium, At least one of the optical paths of the light beams reaching the objective lens is provided inside the guide means, the transfer means generating a driving force for moving the movable unit in the tracking direction, and the guide means for movably supporting the movable unit in the tracking direction. Parts are provided.

In order to achieve the third object, the third structure of the optical head transfer device of the present invention comprises a movable unit having an objective lens for converging a light beam on an arbitrary information track of an optical recording medium, A transfer unit that generates a driving force that transfers the movable unit in the tracking direction, a movable plate that holds the movable unit and is provided with a pair of first recesses extending in the tracking direction, and a movable plate that faces the first recess. The movable plate includes a fixed plate provided with a pair of second recesses extending in the tracking direction, and a ball that fits between the first recess and the second recess and rolls. It is fixed directly to.

In order to achieve the fourth object, the fourth structure of the optical head transfer device of the present invention is a movable unit having an objective lens for converging a light beam on an arbitrary information track of an optical recording medium, A transport means for generating a driving force for transporting the movable unit in the tracking direction and a guide means for movably supporting the movable unit in the tracking direction are provided, and a light beam center in the tracking direction reaching the objective lens and a support center of the guide means. And the heights in the focus direction are substantially the same.

In order to achieve the fifth object, the fifth structure of the optical head transport device of the present invention is a movable unit having an objective lens for converging a light beam on an arbitrary information track of an optical recording medium, A transfer unit that generates a driving force that transfers the movable unit in the tracking direction and a guide unit that movably supports the movable unit in the tracking direction are provided, and the center of the driving force of the transfer unit and the support center of the guide unit are substantially coincident with each other. It was made.

In order to achieve the sixth object, the sixth structure of the optical head transfer device of the present invention comprises a movable unit having an objective lens for converging a light beam on an arbitrary information track of an optical recording medium, A moving unit that generates a driving force that moves the movable unit in the tracking direction; and a guide unit that movably supports the movable unit in the tracking direction, and the center of the driving force of the moving unit and the entire movable portion including the movable unit. The center of gravity and the support center of the guide means are substantially aligned.

In order to achieve the seventh object, in the seventh structure of the optical head transporting device of the present invention, the guide means holds the movable unit and is provided with a pair of first recesses extending in the tracking direction. And a fixed plate provided with a pair of second recesses facing the first recess and extending in the tracking direction, and fitted between the first recess and the second recess. It consists of a rolling ball.

In order to achieve the eighth object, the eighth structure of the optical head transfer device of the present invention comprises a movable unit having an objective lens for focusing a light beam on an arbitrary information track of an optical recording medium, A transfer unit that generates a driving force that transfers the movable unit in the tracking direction, a movable plate that holds the movable unit and is provided with a pair of first recesses extending in the tracking direction, and a movable plate that faces the first recess. Fixing plate provided with a pair of second recesses extending in the tracking direction, a ball fitted between the first recess and the second recess to roll, and a portion where the ball is exposed to the outside. And a shield cover that covers at least a part of the.

In order to achieve the ninth object, the ninth structure of the optical head transfer device of the present invention comprises a movable unit having an objective lens for converging a light beam on an arbitrary information track of an optical recording medium, A transfer unit that generates a driving force that transfers the movable unit in the tracking direction, a movable plate that holds the movable unit and is provided with a pair of first recesses extending in the tracking direction, and a movable plate that faces the first recess. Fixing plate provided with a pair of second concave portions extending in the tracking direction, a ball fitted between the first concave portion and the second concave portion and rolling, and a ball fixed to the fixing plate. And a shield cover that covers at least a part of the portion exposed to the outside.

In order to achieve the tenth object, the tenth structure of the optical head transfer device of the present invention comprises a movable unit having an objective lens for converging a light beam on an arbitrary information track of an optical recording medium, A transfer unit that generates a driving force that transfers the movable unit in the tracking direction, a movable plate that holds the movable unit and is provided with a pair of first recesses extending in the tracking direction, and a movable plate that faces the first recess. Fixing plate provided with a pair of second recesses extending in the tracking direction, a ball fitted between the first recess and the second recess to roll, and a ball rotatably held. In this state, the retainer is inserted into the gap between the movable plate and the fixed plate and covers at least a part of the portion where the ball is exposed to the outside.

In order to achieve the eleventh object, the eleventh configuration of the optical head transfer device of the present invention comprises a movable unit having an objective lens for condensing a light beam on an arbitrary information track of an optical recording medium, A transfer unit that generates a driving force that transfers the movable unit in the tracking direction, a movable plate that holds the movable unit and is provided with a pair of first recesses extending in the tracking direction, and a movable plate that faces the first recess. Fixing plate provided with a pair of second recesses extending in the tracking direction, a ball fitted between the first recess and the second recess to roll, and a ball rotatably held. In this state, the retainer is inserted into the gap between the movable plate and the fixed plate, and the retainer stopper that restricts the movable range of the retainer and covers at least a part of the portion where the ball is exposed to the outside.

[0041]

According to the first structure of the present invention, by fixing the guide means to the fixed portion of the optical recording / reproducing apparatus on both sides of the objective lens in the jitter direction, the motor for mounting and rotating the optical recording medium is provided. Unlike the conventional example, it is not necessary to fix the guide shaft in the vicinity, the fixed part of the guide shaft is not provided between the motor and the movable unit, and the movable stroke on the inner peripheral side of the movable unit can be expanded. Optical recording medium (motor) fixed at the part away from
The reliability can be improved by not transmitting the resonance on the side and the resonance on the side of the movable unit (carriage).

According to the second aspect of the present invention, by providing at least a part of the optical path of the light beam reaching the objective lens inside the guide means, at least a part of the movable unit is formed inside the guide means. As a result, at least a part of the height of the guide unit and the height of the movable unit are shared with respect to the focus direction, and the optical recording / reproducing device can be thinned.

According to the third aspect of the present invention, the component itself that enables linear movement by directly fixing the movable unit to the movable plate provided with the first recess in which the ball can roll, that is, Since the movable unit is fixed directly to the movable plate itself, which is a component required for rolling motion,
The carriage as in the conventional example is not required, the number of parts is reduced, and the weight of the movable part can be reduced.

According to the fourth structure of the present invention, the height of the center of the light beam in the tracking direction to the objective lens and the center of support of the guide means in the focusing direction are substantially the same so that, for example, vibration or impact on the apparatus can be achieved. Even if the guide means vibrates and a rolling motion around the support center of the guide means around the Y direction occurs, the light beam center is substantially coincident with the support center of the guide means, so that the light beam is further amplified. It is possible to make it stable against vibration and the like without being vibrated.

According to the fifth aspect of the present invention, the center of the driving force of the transfer means and the center of the support of the guide means are substantially aligned with each other, so that the moment generated by the driving force of the transfer means is eliminated, and smooth driving is achieved. It will be possible.

According to the sixth structure of the present invention, the center of the driving force of the transfer means and the center of gravity of the entire movable portion including the movable unit and the center of support of the guide means are substantially aligned with each other, so that ideal driving can be performed. The frequency of the natural vibration of the drive system is improved, and the transfer means can be controlled at high speed and with high accuracy.

According to the seventh aspect of the present invention, the guide means holds the movable unit, and the movable plate is provided with a pair of first recesses extending in the tracking direction.
Of the second pair extending in the tracking direction facing the concave portion of the
Of the fixed plate provided with the concave portion and the ball that fits between the first concave portion and the second concave portion and rolls, the component as the guide means is basically a movable plate. Since only the fixing plate and the balls are used, the number of parts is small, the cost is low, and the assembly and adjustment can be simplified.

According to the eighth aspect of the present invention, by covering the exposed portion of the ball with the shield cover, dust can be prevented from entering from the outside and grease can be prevented from scattering to the optical recording medium. The reliability can be improved by preventing it.

According to the ninth aspect of the present invention, the shield cover for covering the portion where the ball is exposed to the outside is fixed to the fixed plate, so that dust from the outside can enter without increasing the mass of the movable portion. The reliability can be improved by preventing the occurrence of grease and by preventing the grease from scattering on the optical recording medium and the like.

The present invention has the tenth structure described above.
The retainer itself inserted in the gap between the movable plate and the fixed plate while holding the ball rotatably covers the part where the ball is exposed to the outside, thereby increasing the number of parts and increasing the cost. In addition, the reliability can be improved by preventing dust from entering from the outside and preventing grease from scattering on the optical recording medium or the like.

The present invention has the eleventh structure described above.
The retainer stopper that restricts the movable range of the retainer that holds the ball rotatably covers the part where the ball is exposed to the outside, so that the mass of the movable part can be reduced without increasing the number of parts and the cost. Without increasing
The reliability can be improved by preventing dust from entering from the outside and preventing grease from scattering on the optical recording medium or the like.

[0052]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical head transfer device according to a first embodiment of the present invention will be described below with reference to the drawings.

1 to 4 show a first embodiment of the present invention. FIG. 1 is an exploded perspective view, FIG. 2 is a top view, FIG. 3 is a sectional view taken along line AA ', and FIG. It is a -B 'sectional view.

1 to 4, X direction, Y direction, Z
The directions are the tracking direction, the jitter direction, and the focus direction, respectively, as in FIG. 17 of the conventional example.

Reference numeral 1 is an optical recording medium, which is an optical disc having spiral or concentric information tracks. 2 is a hub,
It is coaxially fixed to the inner diameter hole of the optical recording medium 1 and is made of a magnetic stainless material. Reference numeral 3 denotes a motor, which is a motor for coaxially mounting and rotating the optical recording medium 1. The rotating shaft 3a is coaxially mounted in the inner diameter hole 2a of the hub 2, and at the same time, the hub 2 is attracted to the magnet 3b. 3c
Is a mounting hole for fixing to an optical recording / reproducing apparatus main body (not shown).

A fixed optical unit 4 includes a semiconductor laser 4a serving as a light source, a collimator lens 4b for collimating the light beam from the semiconductor laser 4a, and a collimator lens 4b.
PBS prism 4c in which a prism and a deflecting beam splitter for shaping the elliptical light beam from the optical disk into a circular shape are integrated, a quarter-wave plate 4d, a half mirror 4e for separating reflected light from the optical recording medium 1, and a half SSD prism 4g in which a detection lens 4f that narrows the transmitted light of the mirror 4e, a half mirror that separates the light beam from the detection lens 4f, and a mirror that reflects the transmitted light of this half mirror are integrated
And a tracking detector (not shown) for detecting the reflected light from the half mirror 4e, a focus detector (not shown) for detecting the reflected light before and after the SSD prism 4g, etc. are housed in a fixed member. It is fixed to the recording / playback device body. Reference numeral 5 denotes a fixed mirror, which is a mirror for reflecting the emitted light of the fixed optical unit 4 or the reflected light of the optical recording medium 1, and is fixed to the main body of the optical recording / reproducing apparatus so that the angle can be adjusted.

Reference numeral 6 denotes a movable unit, which is a movable mirror 6a for reflecting the reflected light of the fixed mirror 5 or the reflected light of the optical recording medium 1, an objective lens 6b for condensing the light beam on the optical recording medium 1, and the movable unit 6 of this movable unit 6. A movable base 6c forming a base, a mirror holder 6d fixed to the movable base 6c at one end and a movable mirror 6a fixed to the other end, a focus coil 6e fixed to the movable base 6c, and a movable base 6
Tracking coil 6f fixed to c, objective lens 6
b is fixed to the movable element 6g, the magnet 6h is fixed to the movable element 6g and is magnetized in the Y direction, and the support rubber 6i is fixed to the movable element 6g at the center and fixed to the movable base 6c at both ends in the Y direction. It is a unit composed of the like. In order to form an optical path in the X direction of the movable unit 6,
The movable base 6c and the mover 6g have holes 6j and 6a, respectively.
k is provided.

A movable plate 7 is formed of a stainless steel plate, and the movable unit 6 is screwed and fixed by a mounting hole 7a and a screw hole 6l of a movable base 6c, and has a V-shape extending in the X direction on both sides in the Y direction. A pair of first recesses 7b are provided. Reference numeral 8 denotes a fixing plate, which is formed of a stainless steel plate, is screwed and fixed to the main body of the optical recording / reproducing device by a mounting hole 8a, and extends in the X direction on both sides in the Y direction so as to face the first recess 7b. A pair of second recesses 8b are provided.
9 is a ball, which is made of stainless steel, and is a retainer 9a.
Is rotatably inserted into the holding hole of the first recess 7b.
And the second concave portion 8b, and the first concave portion 7b
And the second recess 8b can be rolled in the X direction.

Therefore, the movable plate 7, the fixed plate 8 and the balls 9 form a guide means. In FIG. 3, the center of the ball 9 and the center of the movable mirror 6a (that is, the center of the light beam in the X direction from the fixed mirror 5 to the movable mirror 6a) are substantially equal on the line CC ′ in the Z direction. I am doing it. Further, the distances s and s'between the center of the movable mirror 6a (that is, the center of the light beam in the X direction) and the center of the ball 9 have a relationship of s = s'. Therefore,
The support center of the guide means substantially coincides with the center of the movable mirror 6a, that is, the center of the light beam in the X direction from the fixed mirror 5 to the movable mirror 6a.

Reference numeral 10 denotes a retainer stopper, which is a fixing plate 8 with a mounting hole 10a and a mounting hole 8c of the fixing plate 8 by means of a rivet 10b.
The movable range of the retainer 9a in the X direction is fixed. A movable plate stopper 11 is fixed to the main body of the optical recording / reproducing apparatus with a screw through an attachment hole 11a to limit the movable range of the movable plate 7 in the X direction.

A linear motor magnetic circuit 12 includes magnets 12a magnetized in opposite directions in the Y direction, and a yoke 12b formed of electromagnetic soft iron and having the magnet 12a fixed thereto.
It consists of and. The linear motor magnetic circuit 12
In order to form an optical path in the X direction, the hole 12 is formed in the approximate center of the linear motor magnetic circuit 12, that is, in the approximate center of the yoke 12b.
c is formed. In addition, the linear motor magnetic circuit 12
Is fixed to the main body of the optical recording / reproducing apparatus with a screw hole 12d of the yoke 12b. Reference numeral 13 denotes a linear motor coil, which is arranged at the center of the linear motor magnetic circuit 12 with a spatial gap. Therefore, the linear motor magnetic circuit 12 and the linear motor coil 13 constitute a linear motor as a transfer means. Further, the linear motor magnetic circuit 12 and the linear motor coil 13 are configured to be substantially symmetrical in the Y direction and the Z direction with respect to the light beam center in the X direction from the fixed mirror 5 to the movable mirror 6a. Therefore, the center of the driving force of the linear motor as the transfer means substantially coincides with the center of the light beam in the X direction from the fixed mirror 5 to the movable mirror 6.

Reference numeral 14 is a coil holder for fixing the linear motor coil 13 to the screw hole 14a and the mounting hole 7c of the movable plate 7.
And are fixed to the movable plate 7 with screws. In addition, in order to form an optical path in the X direction of the coil holder 14, the hole 14b is formed.
Are formed.

The entire movable part of the linear motor as the transfer means is composed of the movable unit 6, the movable plate 7, the linear motor coil 13 and the coil holder 14, and the center of gravity of the entire movable part is a fixed mirror. It is configured so as to substantially coincide with the center of the light beam in the X direction from 5 to the movable mirror 6a, and thus also coincide with the center of the guide means.

The operation of the optical head transport device of the first embodiment constructed as above will be described below.

First, the optical path of the light beam will be described.
The light beam emitted from the semiconductor laser 4a in the fixed optical unit 4 is converted into an elliptical parallel light by the collimator lens 4b, further shaped into a circular shape by the PBS prism 4c, passed through the 1/4 wavelength plate 4d, and fixed. It is emitted from the optical unit 4. This light beam is reflected by the fixed mirror 5, and the hole 12c of the magnetic circuit 12 and the hole 1 of the coil holder 14 are reflected.
It passes through 4b and enters the movable unit 6. further,
The light passes through the hole 6j of the movable base 6c and the hole 6k of the movable element 6g, is reflected by the movable mirror 6a, and is focused on the information track of the optical recording medium 1 by the objective lens 6b.

The reflected light from the optical recording medium 1 is
The light passes through the opposite path, is reflected by the fixed mirror 5, and enters the fixed optical unit 4. This light beam passes through the quarter-wave plate 4d, is reflected by the PBS prism 4c, and enters the half mirror 4e. A part of the light beam incident on the half mirror 4e is reflected and enters a tracking detector (not shown), and the push-pull method is used to deal with error factors such as eccentricity of the information track of the optical recording medium 1. The tracking error signal is detected. The rest of the light beam incident on the half mirror 4e is transmitted,
The light is focused by the detection lens 4f and enters the SSD prism 4g. A part of this light beam is reflected by the half mirror on the front side of the SSD prism 4g and the rest is transmitted, and the remaining transmitted light is further reflected by the mirror on the rear side of the SSD prism 4g. The reflected light before and after the SSD prism, that is, the reflected light from the front half mirror and the rear mirror is incident on a focus detector (not shown), and the size (spot size) of the front and rear light beams is compared. By the (spot size detection method), a focus error signal is detected in accordance with an error factor such as surface wobbling of the optical recording medium 1. Next, the operation of the movable unit 6 will be described. When a drive current flows through the focus coil 6e based on the above focus error signal, a driving force is generated in the ± Z direction in the magnet 6h by an electromagnetic action with the focus coil 6e. By this driving force, the supporting rubber 6i
Is deformed in the ± Z direction, the movable element 6g integrally formed with the magnet 6h, and therefore the objective lens 6b is driven in the ± Z direction, and the focus of the light beam condensed by the objective lens 6b is focused on the optical recording medium 1. The control (focus control) to follow the recording surface of the information track is performed.

Similarly, when a drive current flows through the tracking coil 6f based on the tracking error signal,
A driving force is generated in the ± X direction in the magnet 6h by the electromagnetic action with the tracking coil 6f. By this driving force, the support rubber 6i is deformed in the ± X directions, and the mover 6g integrally formed with the magnet 6h, that is, the objective lens 6 is formed.
b is driven in the ± X directions, and control (tracking control) is performed to cause the focus of the light beam condensed by the objective lens 6b to follow the information track of the optical recording medium 1.

Next, the operation of the transfer means and the guide means will be described. A command to retrieve the entire movable unit 6 to another information track of the optical recording medium 1 or a command to cause the entire movable unit 6 to follow the low frequency component of the eccentricity of the information track of the optical recording medium 1, that is, the entire movable unit 6 in the ± X direction. When a command to drive is issued to the linear motor coil 1
A drive current flows through the linear motor coil 3, and a driving force is generated in the linear motor coil 13 in the ± X directions by electromagnetic action with the magnetic circuit 12. This driving force causes the ball 9 to move to the first position on the movable plate 7.
Rolling between the concave portion 7b and the second concave portion 8b of the fixed plate 8 to drive the movable plate 7 and the movable unit 6 integrally formed with the linear motor coil 13 in the ± X directions.

As described above, according to the first embodiment, the fixing plate 8 forming a part of the guide means is fixed to the main body of the optical recording / reproducing apparatus on both sides of the objective lens in the Y direction, thereby performing the optical recording. There is no need to fix the guide shaft in the vicinity of the motor 3 for mounting and rotating the medium 1, unlike the conventional example.
Since the fixed portion of the guide shaft is eliminated between the motor 3 and the movable unit 6, the movable stroke on the inner peripheral side of the movable unit 6 can be expanded, and the guide means is fixed at a portion distant from the motor 3 to provide an optical recording medium. The reliability can be improved by not transmitting the resonance on the 1 (motor 3) side and the resonance on the movable unit 6 (movable plate 7) side.

Further, according to the first embodiment, by providing the hole 6j of the movable base 6c and the hole 6k of the movable element 6g between the movable plate 7 and the fixed plate 8 which form a part of the guide means, A part of the movable unit 6 is configured inside the guide unit, the height of the guide unit and the height of the movable unit 6 are shared in the focus direction, and the optical recording / reproducing device can be thinned. Further, in the first embodiment, the hole 14b provided in the coil holder 14 and the magnetic circuit 12 are provided.
By forming the hole 12c provided in the space between the movable plate 7 and the fixed plate 8 which form a part of the guide means in the Z direction, the transfer means can be thinned at the same time.

Further, according to the first embodiment, the movable unit 6 is directly fixed to the movable plate 7 provided with the first concave portion 7b on which the ball 9 can roll, thereby enabling linear movement. Since the movable unit 6 is directly fixed to the movable plate 7 itself which is a component itself, that is, a component required for rolling movement, a carriage or the like as in the conventional example is not required, the number of components is reduced, and the weight of the entire movable portion is reduced. You can

Further, according to the first embodiment, the center of the light beam in the X direction from the fixed mirror 5 to the movable mirror 6a and the support center of the guide means (that is, the center point of the center of the ball 9 in FIG. 3) are set. By making the heights in the Z direction approximately the same,
For example, vibration or shock is applied to the device and the guide means vibrates,
Even if a rolling motion around the support center of the guide means occurs in the Y direction, the light beam center and the support center of the guide means are substantially coincident with each other, so that the light beam is not further amplified and vibrated. It can be stabilized against vibration and the like. Further, in the first embodiment, the position in the Y direction between the center of the light beam in the X direction from the fixed mirror 5 to the movable mirror 6a and the support center of the guide means (that is, the midpoint of the center of the ball 9 in FIG. 3). The structure is stable in this direction as well.

Further, according to the first embodiment, the driving force center of the linear motor as the transfer means and the support center of the guide means (that is, the midpoint of the center of the ball 9 in FIG. 3) are made substantially coincident with each other. The generation of the moment due to the driving force of the linear motor as the transfer means is eliminated, and the smooth driving becomes possible.

Further, according to the first embodiment, the center of the driving force of the linear motor as the transfer means and the entire movable portion, ie, the movable unit 6, the movable plate 7, the linear motor coil 1 are used.
3 and the coil holder 14 and the center of gravity of the entire movable portion, and the support center of the guide means (that is, the ball 9 in FIG. 3).
By making them substantially coincide with the center point of the center of), ideal driving can be performed, the frequency of natural vibration of this drive system is improved, and the transfer means can be controlled at high speed and with high precision.

Further, according to the first embodiment, the guide means holds the movable unit 6, and the movable plate 7 is provided with the pair of first recesses 7b extending in the X direction, and the first movable plate 7. Recess 7b
A fixed plate 8 provided with a pair of second recesses 8b extending in the X direction facing each other, and a ball 9 fitted between the first recess 7b and the second recess 8b and rolling. With the above configuration, since the parts as the guide means are basically only the movable plate 7, the fixed plate 8 and the balls 9, the number of parts is small, the cost is low, and the assembling / adjusting can be simplified.

Next, an optical head transfer device according to a second embodiment of the present invention will be described with reference to the drawings.

5 to 8 show a second embodiment of the present invention, FIG. 5 is an exploded perspective view, FIG. 6 is a top view, FIG. 7 is a sectional view taken along line AA ', and FIG. 8 is B. It is a -B 'sectional view.

5 to 8, X direction, Y direction, Z
The directions are the tracking direction, the jitter direction, and the focus direction, respectively, as in FIG. 17 of the conventional example.

Further, the gravity direction of the optical recording / reproducing apparatus including the optical head transfer device is set to the − (minus) Z direction or the ± Y direction.

First, the structure is basically the same as that of FIGS. 1 to 4 of the first embodiment, and the description of the same structure will be omitted.

Reference numeral 8 denotes a fixing plate, which is formed of a stainless steel plate, is screwed and fixed to the main body of the optical recording / reproducing apparatus by a mounting hole 8a, and is X-shaped on both sides in the Y direction so as to face the first recess 7b.
A pair of V-shaped second recesses 8b extending in the direction are provided. Reference numeral 10 denotes a retainer stopper, which is adhesively fixed to the concave portion 8d of the fixing plate 8 by the mounting portion 10d, and the retainer stopper portion 10b.
Restricts the movable range of the retainer 9a in the X direction, and the shield cover portion 10c covers a portion where the ball 9 is exposed to the + Z side through a gap formed between the movable plate 7 and the fixed plate 8 on the + Z side. .. The movable plate 7 and the shield cover portion 10c
It is desirable to set the gap between and so that the load at the time of transfer does not increase (non-contact), there is practically no scattering of grease, and dust does not enter through the gap, specifically about +50 μm. .. The material of the retainer stopper 10 may be resin or metal. For example, if the retainer stopper 10 is set to a soft resin having a low Young's modulus, the impact of collision of the retainer 9a can be suppressed.

The operation of the optical head transporting device of the second embodiment having the above-mentioned structure will be described below.

The operation is basically similar to that of the first embodiment shown in FIGS. 1 to 4, and only different operation will be described.

The shield cover portion 10c of the retainer stopper 10 covers the portion where the ball 9 is exposed to the + Z side through the gap formed between the movable plate 7 and the fixed plate 8 on the + Z side, and the optical recording medium 1 of grease, etc. To prevent splattering.

Usually, dust is accumulated so as to fall in the direction of gravity, but especially when the optical recording / reproducing apparatus and therefore the optical head transfer apparatus is used with the direction of gravity set to the − (minus) Z direction. , Retainer stopper 10 on + Z side of ball 9
Since it is covered with the shield cover portion 10c, it is possible to prevent dust from entering from the outside.

As described above, according to the second embodiment, the ball 9 is moved to the + Z side through the gap formed on the + Z side between the movable plate 7 and the fixed plate 8 in the shield cover portion 10c of the retainer stopper 10. By covering the exposed portion, it is possible to prevent dust from entering from the outside and to prevent grease from scattering to the optical recording medium 1 or the like, thereby improving reliability.

Further, according to the second embodiment, by fixing the retainer stopper 10 having the shield cover portion 10c to the fixed plate 8, it is possible to prevent dust from entering from the outside without increasing the mass of the movable portion. The reliability can be improved by preventing the grease or scattering of grease on the optical recording medium 1 and the like.

Further, according to the second embodiment, by constructing the retainer stopper 10 having the shield cover portion 10c in which the shield cover and the retainer stopper are integrally formed of the same member, the number of parts and the cost are increased. Without
Without increasing the mass of the movable portion, it is possible to prevent dust from entering from the outside and prevent grease from scattering to the optical recording medium 1 or the like, thereby improving reliability.

Next, an optical head transfer device according to a third embodiment of the present invention will be described with reference to the drawings.

9 to 12 show a third embodiment of the present invention, FIG. 9 is an exploded perspective view, FIG. 10 is a top view, FIG. 11 is a sectional view taken along line AA ', and FIG. It is a -B 'sectional view.

9 to 12, the X direction, the Y direction,
The Z direction is the tracking direction, the jitter direction, and the focus direction, respectively, as in the conventional example of FIG.

The gravitational direction of the optical recording / reproducing apparatus including the optical head transfer device is set to the − (minus) Z direction or the ± Y direction.

First, the structure is basically the same as that of FIGS. 1 to 4 of the first embodiment, and the description of the same structure will be omitted.

9 is a ball, which is made of stainless steel,
It is rotatably inserted into the holding hole of the retainer 9a, and is further fitted between the first recess 7b and the second recess 8b, and the space between the first recess 7b and the second recess 8b is in the X direction. It is possible to roll. A shield cover portion 9aa is provided on the + Z side of the retainer 9a, and covers the portion where the ball 9 is exposed on the + Z side through a gap formed on the + Z side between the movable plate 7 and the fixed plate 8. In the gap between the shield cover portion 9aa and the movable plate 7 and the fixed plate 8, the load at the time of transfer hardly increases (almost no contact), substantially no grease is scattered, and dust does not enter from the gap. It is desirable to set it to a level of about 50 μm. The material of the retainer 9a may be resin or metal. However, if the retainer 9a is set to a resin having a small friction coefficient, the load will be applied even if the retainer 9a comes into contact with the balls 9 or the movable plate 7 or the fixed plate 8 during transfer. It can be kept small and the weight of the retainer 9a itself can be reduced.

The operation of the optical head transport device according to the third embodiment having the above-described structure will be described below.

The operation is basically similar to that of the first embodiment shown in FIGS. 1 to 4, and only the different operation will be described.

The shield cover portion 9aa of the retainer 9a covers the portion of the retainer 9a where the ball 9 is exposed to the + Z side through the gap formed on the + Z side between the movable plate 7 and the fixed plate 8 and the grease is applied to the optical recording medium 1 or the like. To prevent splattering.

Usually, dust is accumulated so as to fall in the direction of gravity, but especially when the optical recording / reproducing apparatus and therefore the optical head transfer apparatus is used with the gravity direction set to the − (minus) Z direction. Since the + Z side of the ball 9 is covered with the shield cover portion 9aa of the retainer 9a, it is possible to prevent dust from entering from the outside.

As described above, according to the third embodiment, the ball 9 is moved to the + Z direction through the gap formed on the + Z side between the movable plate 7 and the fixed plate 8 in the shield cover portion 9aa of the retainer 9a.
By covering the part exposed to the side, it is possible to prevent dust from entering from the outside and prevent the grease from scattering to the optical recording medium 1 or the like, thereby improving reliability.

Further, according to the third embodiment, by constructing the retainer 9a having the shield cover portion 9aa in which the shield cover and the retainer are integrally formed as the same member, the number of parts and the cost are not increased. The reliability can be improved by preventing dust from entering from the outside and preventing grease from scattering on the optical recording medium 1 and the like.

In the third embodiment, the shield cover portion 9aa of the retainer 9a is used to + Z the movable plate 7 and the fixed plate 8.
Although the portion where the ball 9 is exposed to the + Z side is covered through the gap formed on the side, the same effect can be obtained by forming a shield cover on the movable plate.

Next, an optical head transport device according to a fourth embodiment of the present invention will be described with reference to the drawings.

13 to 16 show a fourth embodiment of the present invention, FIG. 13 is an exploded perspective view, FIG. 14 is a top view, FIG. 15 is a sectional view taken along line AA ', and FIG. 16 is B. It is a -B 'sectional view.

13 to 16, the X direction, the Y direction, and the Z direction are the tracking direction, the jitter direction, and the focus direction, respectively, as in the conventional example of FIG.

Further, the gravity direction of the optical recording / reproducing apparatus constituted by the optical head transfer device and the like is set to the − (minus) Z direction or the ± Y direction.

First, the structure is basically the same as that of FIGS. 1 to 4 of the first embodiment, and the description of the same structure will be omitted.

Reference numeral 15 denotes a shield cover, which has a thin plate shape, and is fixed to the fixing plate 8 by adhesion, and the shield cover portion 15b.
The ball 9 covers a portion where the ball 9 is exposed to the + Z side through a gap formed on the + Z side between the movable plate 7 and the fixed plate 8. The holes 15a and 15c are escape holes for the mounting holes 8a and 8c of the fixed plate 8, respectively. The gap between the shield cover portion 15b and the movable plate 7 should be set so that the load during transfer does not increase (non-contact), there is practically no scattering of grease, and dust does not enter through the gap. Desirably, specifically, it may be about +50 μm. Also,
The material of the shield cover 15 may be resin or metal.

The operation of the optical head transport device of the fourth embodiment having the above-mentioned structure will be described below.

The operation is basically similar to that of the first embodiment shown in FIGS. 1 to 4, and only different operation will be described.

The shield cover portion 15b of the shield cover 15 covers the portion where the ball 9 is exposed to the + Z side through the gap formed between the movable plate 7 and the fixed plate 8 on the + Z side, and the optical recording medium 1 of grease, etc. To prevent splattering.

Usually, dust is accumulated so as to fall in the direction of gravity, but especially when the optical recording / reproducing apparatus and therefore the optical head transporting apparatus are used with the direction of gravity set to the − (negative) Z direction. , The + Z side of the ball 9 is the shield cover 1
Since it is covered with the shield cover portion 15b of No. 5, it is possible to prevent dust from entering from the outside.

As described above, according to the fourth embodiment, the ball 9 is inserted through the gap formed on the + Z side between the movable plate 7 and the fixed plate 8 in the shield cover portion 15b of the shield cover 15.
By covering the portion exposed to the + Z side, it is possible to prevent dust from entering from the outside and prevent grease from scattering to the optical recording medium 1 or the like, thereby improving reliability.

In addition, according to the fourth embodiment, by fixing the shield cover 15 to the fixed plate 8, it is possible to prevent dust from entering from the outside and to prevent grease from entering without increasing the mass of the movable portion. Reliability can be improved by preventing scattering to the optical recording medium 1 and the like.

According to the second to fourth embodiments, the shield cover is fixed directly or indirectly (via other parts) to either the movable plate, the fixed plate or the retainer which constitutes the guide means. With this configuration, the guide means alone can cover the ball, and even if the guide means alone is left for a long time, dust does not enter, so that the guide means alone can achieve the purpose.

Further, in the second to fourth embodiments, the shield cover covers the portion where the ball is exposed to the + Z side through the gap formed on the + Z side between the movable plate and the fixed plate. The same effect can be obtained by covering the other direction.

It goes without saying that the second to fourth embodiments also have the effects obtained by the first embodiment.

In the first to fourth embodiments, the movable plate stopper 11 is fixed to the main body of the optical recording / reproducing apparatus to serve as a stopper for the movable plate 7. However, the movable plate 7 itself contacts the retainer 9a. May be provided to serve as a stopper for the movable plate 7.

Further, in the first to fourth embodiments, the movable plate 7, the fixed plate 8 and the balls 9 are made of stainless steel, but a metal such as aluminum may be used depending on necessity of rigidity. Resin may be used.

In the first to fourth embodiments, the optical head is separated into the fixed optical unit and the movable optical unit,
Movable mirror 6a and objective lens 6 as a movable optical unit
Although the transfer device of the separation type optical head having the movable mirror 6a and the objective lens 6b in the movable unit 6 has been described, the integrated optical unit configured to transfer the entire optical head as the movable unit. The head is also effective.

In the first to fourth embodiments, the focus coil 6e and the tracking coil 6f are fixed to the movable base 6c side, and the magnet 6h is fixed to the mover 6g, that is, the objective lens 6b side. Although the objective lens driving device of the type is configured inside the movable unit 6, conversely, the focus coil and the tracking coil are fixed to the objective lens side, and the magnet is fixed to the movable base side, so-called movable coil type objective lens. The drive device may be configured inside the movable unit.

In the first to fourth examples, the objective lens 6b is driven in the ± Z direction and the ± X direction to perform the focus control and the tracking control, respectively. However, the entire movable unit is driven. Tracking control may be performed by the transfer means.

In the first to fourth examples, the objective lens 6b is driven in the ± Z direction and the ± X direction to perform the focus control and the tracking control, respectively. Of the semiconductor laser, the light source means of the semiconductor laser, and the detection means for detecting the reflected light of the optical recording medium of the focus detector and the tracking detector, at least one of the light source means and the detection means and the light condensing means. Alternatively, the integrated optical unit may be driven in the ± Z direction and the ± X direction to perform focus control and tracking control, respectively.

Further, in the first to fourth embodiments, the linear motor magnetic circuit 12 and the linear motor coil 13 constitute a linear motor as the transfer means, but other transfer means may be used, for example, transfer by a stepping motor. The means may be configured.

[0124]

As described above, according to the present invention, the guide means is fixed to the fixed portion of the optical recording / reproducing apparatus on both sides of the objective lens in the jitter direction, thereby the vicinity of the motor for mounting and rotating the optical recording medium. It is not necessary to fix the guide shaft as in the conventional example, the fixed part of the guide shaft is unnecessary between the motor and the movable unit, the movable stroke on the inner peripheral side of the movable unit can be expanded, and the guide means is It is possible to improve reliability by fixing at a part away from the optical recording medium (motor) side resonance and the movable unit (carriage) side resonance, respectively.

Further, according to the present invention, by providing at least a part of the optical path of the light beam reaching the objective lens inside the guide means, at least a part of the movable unit can be configured inside the guide means. At least a part of the height of the guide unit and the height of the movable unit are shared with respect to the focus direction, so that the optical recording / reproducing device can be made thin.

Further, according to the present invention, the first rollable ball is provided.
By directly fixing the movable unit to the movable plate provided with the concave portion, the movable unit is directly fixed to the component itself that enables linear movement, that is, the movable plate itself that is a component required for rolling motion. No such carriage is required, the number of parts is reduced, and the weight of the movable part can be reduced.

Further, according to the present invention, by making the heights of the light beam center in the tracking direction reaching the objective lens in the focusing direction and the support center of the guide means substantially coincide with each other, vibration or impact is applied to the device, and the guide means is provided. Even if it vibrates and a rolling motion around the support center of the guide means around the Y direction occurs, since the center of the light beam is substantially coincident with the support center of the guide means, the light beam is further amplified and vibrated. It can be stabilized against vibration and the like.

Further, according to the present invention, the driving force center of the transfer means and the support center of the guide means are substantially aligned with each other, so that the generation of the moment by the driving force of the transfer means is eliminated and the smooth driving can be realized.

Further, according to the present invention, ideal driving can be performed by making the center of driving force of the transfer means and the center of gravity of the entire movable portion including the movable unit substantially coincide with the support center of the guide means. The natural vibration frequency of the drive system is improved, and the transfer means can be controlled at high speed and with high accuracy.

According to the present invention, the guide means holds the movable unit, is provided with a pair of first recesses extending in the tracking direction, and a movable plate facing the first recesses in the tracking direction. The fixed plate provided with the pair of extended second concave portions and the ball that fits between the first concave portion and the second concave portion and rolls allow the component as the guide means to be formed. Basically, it is only a movable plate, a fixed plate and a ball, so
The number of parts is small and the cost is low, and the assembly and adjustment can be simplified.

Further, according to the present invention, by covering a portion where the ball is exposed to the outside with a shield cover, it is possible to prevent dust from entering from the outside and prevent grease from scattering to an optical recording medium or the like. The reliability can be improved.

Further, according to the present invention, by fixing the shield cover covering the portion where the ball is exposed to the outside to the fixed plate, it is possible to prevent dust from entering from the outside without increasing the mass of the movable portion, The reliability can be improved by preventing the grease from scattering on the optical recording medium or the like.

Further, according to the present invention, the retainer itself inserted in the gap between the movable plate and the fixed plate in a state where the ball is rotatably held covers the portion where the ball is exposed to the outside. The reliability can be improved by preventing dust from entering from the outside and preventing grease from scattering to the optical recording medium or the like without increasing the number of points and increasing the cost.

Further, according to the present invention, the retainer stopper for restricting the movable range of the retainer holding the ball rotatably covers the portion where the ball is exposed to the outside, thereby increasing the number of parts and increasing the cost. It is possible to improve the reliability by preventing dust from entering from the outside and preventing grease from scattering to the optical recording medium or the like without inviting and increasing the mass of the movable portion.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an optical head transfer device according to a first embodiment of the present invention.

FIG. 2 is a top view of the optical head transfer device according to the embodiment.

FIG. 3 is an AA ′ of the optical head transfer device in the embodiment.
Cross section

FIG. 4 is a sectional view taken along line BB ′ of the optical head transfer device in the embodiment.
Cross section

FIG. 5 is an exploded perspective view of an optical head transfer device according to a second embodiment of the present invention.

FIG. 6 is a top view of the optical head transfer device in the embodiment.

FIG. 7 is an AA ′ of the optical head transfer device in the embodiment.
Cross section

FIG. 8 is a sectional view taken along line BB ′ of the optical head transfer device in the embodiment.
Cross section

FIG. 9 is an exploded perspective view of an optical head transfer device according to a third embodiment of the present invention.

FIG. 10 is a top view of the optical head transport device according to the embodiment.

FIG. 11 is an A- of the optical head transfer device in the embodiment.
A'cross section

FIG. 12 B- of the optical head transfer device in the embodiment
B'cross section

FIG. 13 is an exploded perspective view of an optical head transfer device according to a fourth embodiment of the present invention.

FIG. 14 is a top view of the optical head transfer device in the embodiment.

FIG. 15 is an A- of the optical head transfer device in the embodiment.
A'cross section

FIG. 16 is a B- of the optical head transfer device in the embodiment.
B'cross section

17A is a top view of a conventional optical head transfer device, and FIG. 17B is a side view of a conventional optical head transfer device.

[Explanation of symbols]

 1 Optical Recording Medium 3 Motor 6 Movable Unit 6a Movable Mirror 6b Objective Lens 7 Movable Plate 7b First Recess 8 Fixed Plate 8b Second Recess 9 Ball 9a Retainer 9aa Shield Cover 10 Retainer Stop 10c Shield Cover 12 Linear Motor Magnetic Circuit 13 Linear motor coil 15 Shield cover 15b Shield cover part

[Procedure amendment]

[Submission date] November 19, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

Title: Optical head transfer device

[Claims]

Detailed Description of the Invention

[0001]

The present invention relates to an optical recording or reproducing apparatus and focused on the information track formed on the optical recording medium performs recording or reproducing or erasing information (hereinafter, simply
Therefore, the present invention relates to an optical head transfer device for transferring an optical head of an optical recording / reproducing device) .

[0002]

2. Description of the Related Art In recent years, an optical recording / reproducing device has been attracting attention as a high-density and large-capacity memory.

Conventionally, an optical head transfer device of an optical recording / reproducing apparatus has a plurality of means as a means for guiding the movement of a movable unit having an objective lens for focusing a light beam on an arbitrary information track of an optical recording medium. A structure including a ball bearing and a guide shaft is commonly used.

For example, Japanese Patent Application Laid-Open No. 62-26676 proposes an optical head transfer device of the type in which a carriage for mounting a movable unit is constructed and the movable unit is moved together with the carriage.

An example of a conventional optical head transfer device will be described below with reference to the drawings. FIG. 17 shows a conventional optical head transfer device.

In FIG. 17, the X direction is a direction orthogonal to an information track of an optical recording medium (not shown) (hereinafter referred to as a tracking direction), and the Z direction is a direction perpendicular to the optical recording medium (hereinafter, focus). Direction), the Y direction is a direction perpendicular to both the X direction and the Z direction, and is the tangential direction of the information track of the optical recording medium (hereinafter referred to as the jitter direction).

In FIG. 17, 101 is a carriage,
A movable unit 105 described later is mounted. 102
Guide shafts a and 102b are provided on both sides of the carriage 101 to guide the carriage 101. 103
a and 104a are ball bearings, which are the carriage 101.
It is provided on one of the side surfaces and is arranged so as to be rollable symmetrically with respect to the guide shaft 102a in the Y direction. Reference numeral 103b denotes a ball bearing, although only one ball bearing is shown, there is another ball bearing, which is provided on one side surface of the carriage 101 in the Y direction with respect to the guide shaft 102a, like the ball bearings 103a and 104a. It is symmetrically arranged so that it can roll. 103c, 104
Reference numeral c is a ball bearing, which is provided on the other side surface of the carriage 101 and is arranged so as to be rollable symmetrically with respect to the guide shaft 102b in the Y direction. Reference numeral 105 denotes a movable unit, which performs control (focus control and tracking control) such that an objective lens that focuses a light beam on an information track of an optical recording medium and a focus of the focused light beam follow a recording surface of the information track. Therefore, an actuator or the like for driving the objective lens in the ± Z direction and the ± X direction is configured. Reference numeral 106 denotes an optical recording / reproducing apparatus main body, which is a guide shaft 102.
Both ends of a and 102b are fixed.

Reference numeral 107 denotes a mounting shaft, which is a mounting shaft for the ball bearing 104c at a position where the weight of the carriage 101 is not applied (the gravity direction is set in the-(minus) Z direction or + Y direction). Is fixed to the inner ring 104c1 of the ball bearing 104c. 1
Reference numeral 08 denotes a support hole provided on the carriage 101.
Reference numeral 109 denotes an annular rubber elastic material, which is fitted into the support hole 108 and supports the other end of the mounting shaft 107.

The operation of the conventional optical head transfer device constructed as described above will be described.

When a current flows through a coil of a linear motor (not shown) which is a transfer means connected to the carriage 101 according to an instruction from a controller (not shown), the carriage 1
The driving force in the ± X direction acts on 01. Therefore, when the target information track of the movable unit 105 is determined,
An electric current flows through the coil of the linear motor according to an instruction from the control unit, and the driving force of the linear motor causes the carriage 101 and hence the movable unit 105 to move in the + X direction or the − ( minor
S ) Controlled movement to reach the target information track in the X direction.

[0011]

However, in the conventional structure, although the motor for mounting the optical recording medium and rotationally driving it is not shown, it is necessary to configure it on the − (minus) X direction side or the + X direction side. In addition, since one end of each of the guide shafts 102a and 102b must be fixed near the motor, the movable stroke of the movable unit 105 near the motor, that is, on the inner peripheral side is limited,
Further, the guide shafts 102a and 102b are provided near the motor.
Since one end of each is fixed, the resonance of the optical recording medium (mechanical natural vibration) and the resonance of the motor are caused by the guide shaft 1.
02a, 102b from one end of the guide shaft 102a, 102
b to the carriage 101 and then to the movable unit 105 to make high-precision control difficult, and conversely, the resonance of the movable unit 105 and the resonance of the carriage 101 are transmitted to the optical recording medium via the opposite routes. The first problem is that it makes it difficult to perform highly accurate control.

In view of the above-mentioned first problem, the present invention has a first object that the movable stroke on the inner peripheral side of the movable unit is enlarged and the harmful resonance is hardly transmitted to the optical recording medium or the movable unit. (EN) Provided is an optical head transfer device having high efficiency.

Further, in the conventional structure, the guide shaft 1
02a, 102b, ball bearing, carriage 10
Although not shown in the figure, it is considered that the optical path of the light beam is configured inside the movable unit 105, and the movable unit 1 is mounted on the carriage 101.
Therefore, the movable unit 105 in which the optical path of the light beam is formed and the guide means are completely separate from each other, and the carriage 101 in the Z direction is mounted.
Therefore, both the height as the guide means and the height of the movable unit 105 are required, so that there is the second problem that the optical recording / reproducing apparatus cannot be made thin.

In view of the above-mentioned second problem, the present invention has as a second object to provide an optical head transfer device which enables a thin optical recording / reproducing device.

Further, in the conventional structure, the guide shaft 1
02a, 102b, ball bearing, carriage 10
Although the guide means is composed of 1 or the like, the parts themselves that enable linear movement, that is, the parts necessary for the rolling motion are only the guide shaft and the ball bearing, but other than that, the mounting shaft that holds the ball bearing. Since a carriage and the like are required, there is a third problem that not only the number of parts is increased but also the mass of the entire movable portion is increased.

In view of the above-mentioned third problem, the present invention has as a third object to provide an optical head transporting device which has a small number of parts and which can reduce the weight of the entire movable part.

In the conventional structure, although not shown, it is considered that the optical path of the light beam is formed inside the movable unit 105, and the support center of the guide means, that is, the guide shafts 102a and 102b in the Z direction. Since the center of the light beam is separated from the center of the light beam set inside the movable unit 105, for example, when vibration or shock is applied to the device and the guide means vibrates, rolling motion around the Y direction around the support center of the guide means. Occurs, and the light beam is further amplified and vibrated, which causes a problem.

In view of the above-mentioned fourth problem, the present invention has as a fourth object to provide an optical head transporting device which operates stably against vibration and the like.

Further, in the above conventional example, the movable unit is ± X.
The position of the linear motor as the transfer means for driving in the direction is not shown, but since the support center of the guide means and the center of the driving force of the linear motor as the transfer means are generally apart, a moment is generated and smooth. It had the fifth problem that it could not be driven in a proper manner.

In view of the fifth object of the present invention, as a fifth object, the present invention provides an optical head transfer device capable of smoothly driving a movable unit without generating a moment due to the driving force of the transfer means.

Further, in general, at least one of the center of support of the guide means, the center of gravity of the entire movable portion, and the center of the driving force of the transfer means is separated from the other two center positions. Since the ideal drive cannot be performed and the frequency of the natural vibration of the drive system is lowered, the control system becomes unstable due to the natural vibration when trying to control the transfer means at high speed with high accuracy. I had.

As a sixth object of the present invention, in view of the above-mentioned sixth problem, an optical head transfer device which improves the frequency of the natural vibration of the transfer means and enables high-speed and highly accurate control of the transfer means is provided. To do.

In the above-mentioned conventional example, the guide means is composed of two guide shafts, six ball bearings and their mounting shafts, one carriage, and the like.
The seventh problem was that the number of parts was extremely large and assembly and adjustment were troublesome.

In view of the above-mentioned seventh object, the present invention achieves at least one of the first, second, fourth, fifth and sixth objects as a seventh object, and at the same time, (EN) An optical head transfer device which has a small number of parts, is easy to assemble and adjust and is inexpensive.

Further, as will be described later in detail, in the guide means constituted by the movable plate, the fixed plate and the ball as in the present invention, the gap between the movable plate and the fixed plate is conventionally open,
Since the ball is exposed to the outside, if this guide means is adopted in the optical head transfer device, dust will enter from the outside and the load during transfer will increase, and the grease filled for ball lubrication will scatter. The eighth problem is that it adheres to a recording medium or the like.

In view of the eighth object of the present invention, as an eighth object, the present invention covers a portion where the ball is exposed to the outside to prevent dust from entering from the outside or to apply grease to an optical recording medium or the like. It is intended to provide a highly reliable optical head transfer device that prevents the scattering of light.

The present invention also provides, as a ninth object, an eighth object.
(EN) An optical head transfer device which achieves the above object and at the same time makes it possible to reduce the weight of a movable part.

The present invention, as a tenth object, achieves the eighth object without increasing the number of parts, and provides an inexpensive optical head transfer device.

Further, the present invention, as the eleventh object, achieves the ninth object without increasing the number of parts, and provides an inexpensive optical head transfer device.

[0030]

In order to achieve the first object, the first structure of the optical head transfer device of the present invention is an objective lens for converging a light beam on an arbitrary information track of an optical recording medium. The movable unit provided, the transfer means for generating a driving force for transferring the movable unit in the tracking direction, and the movable unit movably supported in the tracking direction,
One unit is provided with a unitized guide unit, and the guide unit is fixed to the fixed portion of the optical recording / reproducing apparatus on both sides of the objective lens center in the jitter direction.
Alternatively, the rolling or sliding movement of the guide means
The length of the guide part that guides the moving body in the tracking direction
Fixed to the fixed part of the optical recording / reproducing device within the range of
is there.

In order to achieve the second object, the second structure of the optical head transfer device of the present invention is a movable unit having an objective lens for converging a light beam on an arbitrary information track of an optical recording medium, At least one of the optical paths of the light beams reaching the objective lens is provided inside the guide means, the transfer means generating a driving force for moving the movable unit in the tracking direction, and the guide means for movably supporting the movable unit in the tracking direction. Parts are provided.

In order to achieve the third object, the third structure of the optical head transfer device of the present invention comprises a movable unit having an objective lens for converging a light beam on an arbitrary information track of an optical recording medium, A transfer unit that generates a driving force that transfers the movable unit in the tracking direction, a movable plate that holds the movable unit and is provided with a pair of first recesses extending in the tracking direction, and a movable plate that faces the first recess. The movable plate includes a fixed plate provided with a pair of second recesses extending in the tracking direction, and a ball that fits between the first recess and the second recess and rolls. It is fixed directly to.

In order to achieve the fourth object, the fourth structure of the optical head transfer device of the present invention is a movable unit having an objective lens for converging a light beam on an arbitrary information track of an optical recording medium, A transport means for generating a driving force for transporting the movable unit in the tracking direction and a guide means for movably supporting the movable unit in the tracking direction are provided, and a light beam center in the tracking direction reaching the objective lens and a support center of the guide means. The heights of and in the focus direction are substantially the same.

In order to achieve the fifth object, the fifth structure of the optical head transport device of the present invention is a movable unit having an objective lens for converging a light beam on an arbitrary information track of an optical recording medium, A transfer unit that generates a driving force that transfers the movable unit in the tracking direction and a guide unit that movably supports the movable unit in the tracking direction are provided, and the center of the driving force of the transfer unit and the support center of the guide unit are substantially coincident with each other. It was made.

In order to achieve the sixth object, the sixth structure of the optical head transfer device of the present invention comprises a movable unit having an objective lens for converging a light beam on an arbitrary information track of an optical recording medium, A moving unit that generates a driving force that moves the movable unit in the tracking direction; and a guide unit that movably supports the movable unit in the tracking direction, and the center of the driving force of the moving unit and the entire movable portion including the movable unit. The center of gravity and the support center of the guide means are substantially aligned.

In order to achieve the seventh object, in the seventh structure of the optical head transporting device of the present invention, the guide means holds the movable unit and is provided with a pair of first recesses extending in the tracking direction. And a fixed plate provided with a pair of second recesses facing the first recess and extending in the tracking direction, and fitted between the first recess and the second recess. It consists of a rolling ball.

In order to achieve the eighth object, the eighth structure of the optical head transfer device of the present invention comprises a movable unit having an objective lens for focusing a light beam on an arbitrary information track of an optical recording medium, A transfer unit that generates a driving force that transfers the movable unit in the tracking direction, a movable plate that holds the movable unit and is provided with a pair of first recesses extending in the tracking direction, and a movable plate that faces the first recess. Fixing plate provided with a pair of second recesses extending in the tracking direction, a ball fitted between the first recess and the second recess to roll, and a portion where the ball is exposed to the outside. Cover at least part of
And the movable plate, the fixed plate, or the ball
It has a shield cover built into the.

In order to achieve the ninth object, the ninth structure of the optical head transfer device of the present invention comprises a movable unit having an objective lens for converging a light beam on an arbitrary information track of an optical recording medium, A transfer unit that generates a driving force that transfers the movable unit in the tracking direction, a movable plate that holds the movable unit and is provided with a pair of first recesses extending in the tracking direction, and a movable plate that faces the first recess. Fixing plate provided with a pair of second concave portions extending in the tracking direction, a ball fitted between the first concave portion and the second concave portion and rolling, and a ball fixed to the fixing plate. And a shield cover that covers at least a part of the portion exposed to the outside.

In order to achieve the tenth object, the tenth structure of the optical head transfer device of the present invention comprises a movable unit having an objective lens for converging a light beam on an arbitrary information track of an optical recording medium, A transfer unit that generates a driving force that transfers the movable unit in the tracking direction, a movable plate that holds the movable unit and is provided with a pair of first recesses extending in the tracking direction, and a movable plate that faces the first recess. Fixing plate provided with a pair of second recesses extending in the tracking direction, a ball fitted between the first recess and the second recess to roll, and a ball rotatably held. In this state, the retainer is inserted into the gap between the movable plate and the fixed plate and covers at least a part of the portion where the ball is exposed to the outside.

In order to achieve the eleventh object, the eleventh configuration of the optical head transfer device of the present invention comprises a movable unit having an objective lens for condensing a light beam on an arbitrary information track of an optical recording medium, A transfer unit that generates a driving force that transfers the movable unit in the tracking direction, a movable plate that holds the movable unit and is provided with a pair of first recesses extending in the tracking direction, and a movable plate that faces the first recess. Fixing plate provided with a pair of second recesses extending in the tracking direction, a ball fitted between the first recess and the second recess to roll, and a ball rotatably held. In this state, the retainer is inserted into the gap between the movable plate and the fixed plate, and the retainer stopper that restricts the movable range of the retainer and covers at least a part of the portion where the ball is exposed to the outside.

[0041]

According to the first aspect of the present invention, the guide means is fixed to the fixed portion of the optical recording / reproducing apparatus on both sides of the objective lens in the jitter direction or guides the moving body.
Within the range of the length of the guide part in the tracking direction, the optical recording
By fixing to the fixed part of the raw device, there is no need to fix the guide shaft near the motor for mounting and rotating the optical recording medium as in the conventional example, and the fixed part of the guide shaft between the motor and the movable unit. , The movable stroke on the inner peripheral side of the movable unit can be expanded, and the guide means is fixed at a portion away from the motor to cause resonance on the optical recording medium (motor) side and resonance on the movable unit (carriage) side. You can improve reliability by not telling each one.

According to the second aspect of the present invention, by providing at least a part of the optical path of the light beam reaching the objective lens inside the guide means, at least a part of the movable unit is formed inside the guide means. As a result, at least a part of the height of the guide unit and the height of the movable unit are shared with respect to the focus direction, and the optical recording / reproducing device can be thinned.

According to the third aspect of the present invention, the component itself that enables linear movement by directly fixing the movable unit to the movable plate provided with the first recess in which the ball can roll, that is, Since the movable unit is fixed directly to the movable plate itself, which is a component required for rolling motion,
The carriage or the like as in the conventional example is not required, the number of parts is reduced, and the weight of the movable portion can be reduced.

[0044] The present invention is by the fourth configuration described above, by substantially matching the focus direction of the height of the support center of the tracking direction of the light beam center of the guide means leading to the objective lens, for example, an optical recording and reproducing apparatus thus Optical head
Even if a vibration or impact is applied to the transfer device to vibrate the guide means and a rolling motion around the support center of the guide means around the Y direction occurs, the center of the light beam substantially coincides with the support center of the guide means. The light beam is not further amplified and vibrated, and can be stabilized against vibration and the like.

According to the fifth aspect of the present invention, the center of the driving force of the transfer means and the center of the support of the guide means are substantially aligned with each other, so that the moment generated by the driving force of the transfer means is eliminated, and smooth driving is achieved. It will be possible.

According to the sixth structure of the present invention, the center of the driving force of the transfer means and the center of gravity of the entire movable portion including the movable unit and the center of support of the guide means are made to substantially coincide with each other, so that ideal driving can be performed. The frequency of the natural vibration of the drive system is improved, and the transfer means can be controlled at high speed and with high accuracy.

According to the seventh aspect of the present invention, the guide means holds the movable unit, and the movable plate is provided with a pair of first recesses extending in the tracking direction.
Of the second pair extending in the tracking direction facing the concave portion of the
Of the fixed plate provided with the concave portion and the ball that fits between the first concave portion and the second concave portion and rolls, the component as the guide means is basically a movable plate. Since only the fixing plate and the balls are used, the number of parts is small and the cost is low, and moreover , it can be unitized into only one unit and the assembly and adjustment can be simplified.

[0048] The present invention depending on the configuration of the eighth described above, group
By covering the part where the ball is exposed to the outside with the guide means and unitized shield cover, it is possible to prevent dust from entering from the outside and to prevent grease from scattering to the optical recording medium. Therefore, the reliability can be improved.

According to the ninth aspect of the present invention, the shield cover for covering the portion where the ball is exposed to the outside is fixed to the fixed plate, so that dust from the outside can enter without increasing the mass of the movable portion. The reliability can be improved by preventing the occurrence of grease and by preventing the grease from scattering on the optical recording medium and the like.

The present invention has the tenth structure described above.
The retainer itself inserted in the gap between the movable plate and the fixed plate while holding the ball rotatably covers the part where the ball is exposed to the outside, thereby increasing the number of parts and increasing the cost. In addition, the reliability can be improved by preventing dust from entering from the outside and preventing grease from scattering on the optical recording medium or the like.

The present invention has the eleventh structure described above.
The retainer stopper that restricts the movable range of the retainer that holds the ball rotatably covers the part where the ball is exposed to the outside, so that the mass of the movable part can be reduced without increasing the number of parts and the cost. Without increasing
The reliability can be improved by preventing dust from entering from the outside and preventing grease from scattering on the optical recording medium or the like.

[0052]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical head transfer device according to a first embodiment of the present invention will be described below with reference to the drawings.

1 to 4 show a first embodiment of the present invention. FIG. 1 is an exploded perspective view, FIG. 2 is a top view, FIG. 3 is a sectional view taken along line AA ', and FIG. It is a -B 'sectional view.

1 to 4, X direction, Y direction, Z
The directions are the tracking direction, the jitter direction, and the focus direction, respectively, as in FIG. 17 of the conventional example.

Reference numeral 1 is an optical recording medium, which is an optical disc having spiral or concentric information tracks. 2 is a hub,
It is coaxially fixed to the inner diameter hole of the optical recording medium 1 and is made of a magnetic stainless material. Reference numeral 3 denotes a motor, which is a motor for coaxially mounting and rotating the optical recording medium 1. The rotating shaft 3a is coaxially mounted in the inner diameter hole 2a of the hub 2, and at the same time, the hub 2 is attracted to the magnet 3b. 3c
Is a mounting hole for fixing to an optical recording / reproducing apparatus main body (not shown).

A fixed optical unit 4 includes a semiconductor laser 4a serving as a light source, a collimator lens 4b for collimating the light beam from the semiconductor laser 4a, and a collimator lens 4b.
PBS prism 4c in which a prism and a deflecting beam splitter for shaping the elliptical light beam from the optical disk into a circular shape are integrated, a quarter-wave plate 4d, a half mirror 4e for separating reflected light from the optical recording medium 1, and a half SSD prism 4g in which a detection lens 4f that narrows the transmitted light of the mirror 4e, a half mirror that separates the light beam from the detection lens 4f, and a mirror that reflects the transmitted light of this half mirror are integrated
And a tracking detector (not shown) for detecting the reflected light from the half mirror 4e, a focus detector (not shown) for detecting the reflected light before and after the SSD prism 4g, etc. are housed in a fixed member. It is fixed to the recording / playback device body. Reference numeral 5 denotes a fixed mirror, which is a mirror for reflecting the emitted light of the fixed optical unit 4 or the reflected light of the optical recording medium 1, and is fixed to the main body of the optical recording / reproducing apparatus so that the angle can be adjusted.

Reference numeral 6 denotes a movable unit, which is a movable mirror 6a for reflecting the reflected light of the fixed mirror 5 or the reflected light of the optical recording medium 1, an objective lens 6b for condensing the light beam on the optical recording medium 1, and the movable unit 6 of this movable unit 6. A movable base 6c forming a base, a mirror holder 6d fixed to the movable base 6c at one end and a movable mirror 6a fixed to the other end, a focus coil 6e fixed to the movable base 6c, and a movable base 6
Tracking coil 6f fixed to c, objective lens 6
b is fixed to the movable element 6g, the magnet 6h is fixed to the movable element 6g and is magnetized in the Y direction, and the support rubber 6i is fixed to the movable element 6g at the center and fixed to the movable base 6c at both ends in the Y direction. It is a unit composed of the like. In order to form an optical path in the X direction of the movable unit 6,
The movable base 6c and the mover 6g have holes 6j and 6a, respectively.
k is provided.

A movable plate 7 is formed of a stainless steel plate, and the movable unit 6 is screwed and fixed by a mounting hole 7a and a screw hole 6l of a movable base 6c, and has a V-shape extending in the X direction on both sides in the Y direction. A pair of first recesses 7b are provided. Reference numeral 8 denotes a fixing plate, which is formed of a stainless steel plate, is screwed and fixed to the main body of the optical recording / reproducing device by a mounting hole 8a, and extends in the X direction on both sides in the Y direction so as to face the first recess 7b. The second concave portion 8b is provided as a pair of guide portions . Reference numeral 9 denotes a ball as a moving body , which is made of stainless steel, is rotatably inserted into the holding hole of the retainer 9a, and is fitted between the first concave portion 7b and the second concave portion 8b. It is possible to roll in the X direction between the concave portion 7b and the second concave portion 8b.

Therefore, the movable plate 7, the fixed plate 8 and the balls 9 form a guide means. In FIG. 3, the center of the ball 9 and the center of the movable mirror 6a (that is, the center of the light beam in the X direction from the fixed mirror 5 to the movable mirror 6a) are substantially equal on the line CC ′ in the Z direction. I am doing it. Further, the distances s and s'between the center of the movable mirror 6a (that is, the center of the light beam in the X direction) and the center of the ball 9 have a relationship of s = s'. Therefore,
The support center of the guide means substantially coincides with the center of the movable mirror 6a, that is, the center of the light beam in the X direction from the fixed mirror 5 to the movable mirror 6a.

Reference numeral 10 denotes a retainer stopper, which is a fixing plate 8 with a mounting hole 10a and a mounting hole 8c of the fixing plate 8 by means of a rivet 10b.
The movable range of the retainer 9a in the X direction is regulated. A movable plate stopper 11 is fixed to the main body of the optical recording / reproducing apparatus with a screw through an attachment hole 11a to limit the movable range of the movable plate 7 in the X direction.

A linear motor magnetic circuit 12 includes magnets 12a magnetized in opposite directions in the Y direction, and a yoke 12b formed of electromagnetic soft iron and having the magnet 12a fixed thereto.
It consists of and. The linear motor magnetic circuit 12
In order to form an optical path in the X direction, the hole 12 is formed in the approximate center of the linear motor magnetic circuit 12, that is, in the approximate center of the yoke 12b.
c is formed. In addition, the linear motor magnetic circuit 12
Is fixed to the main body of the optical recording / reproducing apparatus with a screw hole 12d of the yoke 12b. Reference numeral 13 denotes a linear motor coil, which is arranged at the center of the linear motor magnetic circuit 12 with a spatial gap. Therefore, the linear motor magnetic circuit 12 and the linear motor coil 13 constitute a linear motor as a transfer means. Further, the linear motor magnetic circuit 12 and the linear motor coil 13 are configured to be substantially symmetrical in the Y direction and the Z direction with respect to the light beam center in the X direction from the fixed mirror 5 to the movable mirror 6a. Therefore, the center of the driving force of the linear motor as the transfer means substantially coincides with the center of the light beam in the X direction from the fixed mirror 5 to the movable mirror 6.

Reference numeral 14 is a coil holder for fixing the linear motor coil 13 to the screw hole 14a and the mounting hole 7c of the movable plate 7.
And are fixed to the movable plate 7 with screws. In addition, in order to form an optical path in the X direction of the coil holder 14, the hole 14b is formed.
Are formed.

The entire movable part of the linear motor as the transfer means is composed of the movable unit 6, the movable plate 7, the linear motor coil 13 and the coil holder 14, and the center of gravity of the entire movable part is a fixed mirror. It is configured so as to substantially coincide with the center of the light beam in the X direction from 5 to the movable mirror 6a, and thus also coincide with the center of the guide means.

The operation of the optical head transporting device of the first embodiment constructed as above will be described below.

First, the optical path of the light beam will be described.
The light beam emitted from the semiconductor laser 4a in the fixed optical unit 4 is converted into an elliptical parallel light by the collimator lens 4b, further shaped into a circular shape by the PBS prism 4c, passed through the 1/4 wavelength plate 4d, and fixed. It is emitted from the optical unit 4. This light beam is reflected by the fixed mirror 5, and the hole 12c of the magnetic circuit 12 and the hole 1 of the coil holder 14 are reflected.
It passes through 4b and enters the movable unit 6. further,
The light passes through the hole 6j of the movable base 6c and the hole 6k of the movable element 6g, is reflected by the movable mirror 6a, and is focused on the information track of the optical recording medium 1 by the objective lens 6b.

The reflected light from the optical recording medium 1 is
The light passes through the opposite path, is reflected by the fixed mirror 5, and enters the fixed optical unit 4. This light beam passes through the quarter-wave plate 4d, is reflected by the PBS prism 4c, and enters the half mirror 4e. A part of the light beam incident on the half mirror 4e is reflected and enters a tracking detector (not shown), and the push-pull method is used to deal with error factors such as eccentricity of the information track of the optical recording medium 1. The tracking error signal is detected. The rest of the light beam incident on the half mirror 4e is transmitted,
The light is focused by the detection lens 4f and enters the SSD prism 4g. A part of this light beam is reflected by the half mirror on the front side of the SSD prism 4g and the rest is transmitted, and the remaining transmitted light is further reflected by the mirror on the rear side of the SSD prism 4g. The reflected light before and after the SSD prism, that is, the reflected light from the front half mirror and the rear mirror is incident on a focus detector (not shown), and the size (spot size) of the front and rear light beams is compared. By the (spot size detection method), a focus error signal is detected in accordance with an error factor such as surface wobbling of the optical recording medium 1.

Next, the operation of the movable unit 6 will be described. When a drive current flows through the focus coil 6e based on the above focus error signal, a driving force is generated in the ± Z direction in the magnet 6h by an electromagnetic action with the focus coil 6e. By this driving force, the supporting rubber 6i
Is deformed in the ± Z direction, the movable element 6g integrally formed with the magnet 6h, and therefore the objective lens 6b is driven in the ± Z direction, and the focus of the light beam condensed by the objective lens 6b is focused on the optical recording medium 1. The control (focus control) to follow the recording surface of the information track is performed.

Similarly, when a drive current flows through the tracking coil 6f based on the tracking error signal,
A driving force is generated in the ± X direction in the magnet 6h by the electromagnetic action with the tracking coil 6f. By this driving force, the support rubber 6i is deformed in the ± X directions, and the mover 6g integrally formed with the magnet 6h, that is, the objective lens 6 is formed.
b is driven in the ± X directions, and control (tracking control) is performed to cause the focus of the light beam condensed by the objective lens 6b to follow the information track of the optical recording medium 1.

Next, the operation of the transfer means and the guide means will be described. A command to retrieve the entire movable unit 6 to another information track of the optical recording medium 1 or a command to cause the entire movable unit 6 to follow the low frequency component of the eccentricity of the information track of the optical recording medium 1, that is, the entire movable unit 6 in the ± X direction. When a command to drive is issued to the linear motor coil 1
A drive current flows through the linear motor coil 3, and a driving force is generated in the linear motor coil 13 in the ± X directions by electromagnetic action with the magnetic circuit 12. This driving force causes the ball 9 to move to the first position on the movable plate 7.
Rolling between the concave portion 7b and the second concave portion 8b of the fixed plate 8 to drive the movable plate 7 and the movable unit 6 integrally formed with the linear motor coil 13 in the ± X directions.

[0070] According to the first embodiment as described above, it has in either the fixing plate 8 which constitutes a part of the guide means is fixed to the optical recording and reproducing apparatus body on both sides of the objective lens in the Y-direction
Is a guide part for guiding the ball 9 as a moving body.
Within the range of the length of the second concave portion 8b in the tracking direction.
By fixing to the main body of the optical recording / reproducing apparatus, there is no need to fix the guide shaft in the vicinity of the motor 3 for mounting and rotating the optical recording medium 1 as in the conventional example, and the guide shaft is provided between the motor 3 and the movable unit 6. Since the fixed portion of the shaft is eliminated, the movable stroke on the inner peripheral side of the movable unit 6 can be expanded, and the guide means is fixed at a portion away from the motor 3 so that the resonance and movement on the optical recording medium 1 (motor 3) side can be achieved. The reliability can be improved by not transmitting the resonance on the unit 6 (movable plate 7) side. Moreover, in the case of the conventional example, the guide
The means is to incorporate a ball bearing into the carriage and
First, the id axis and carriage were installed in the optical recording / reproducing device.
However, according to the first embodiment, the guide hand
Basically, there is only one step with movable plate 7, fixed plate 8 and ball 9.
Since it can be unitized into other units, assembly, adjustment, etc.
It can be done very easily with the id means alone. Na
Optical recording on the fixed plate 8 on both sides of the objective lens in the Y direction
When fixed to the playback device body, as is clear from Fig. 3,
At the same time, the optical recording / reproducing apparatus can be made thinner.

Further, according to the first embodiment, the hole 6j of the movable base 6c and the hole 6k of the movable element 6g are provided between the movable plate 7 and the fixed plate 8 which form a part of the guide means. A part of the movable unit 6 is configured inside the guide unit, the height of the guide unit and the height of the movable unit 6 are shared in the focus direction, and the optical recording / reproducing device can be thinned. Further, in the first embodiment, the hole 14b provided in the coil holder 14 and the magnetic circuit 1 are provided.
By forming the hole 12c provided in 2 between the movable plate 7 and the fixed plate 8 which form a part of the guide means in the Z direction, the transfer means can be thinned at the same time.

Further, according to the first embodiment, the ball 9
By directly fixing the movable unit 6 to the movable plate 7 provided with the first concave portion 7b capable of rolling, the movable plate 7 itself which is a component itself that enables linear movement, that is, a component necessary for rolling motion. Since the movable unit 6 is directly fixed to, the carriage or the like as in the conventional example is unnecessary,
The number of parts is reduced, and the weight of the entire moving part can be reduced.

Further, according to the first embodiment, the center of the light beam in the X direction from the fixed mirror 5 to the movable mirror 6a and the support center of the guide means (that is, the midpoint of the center of the ball 9 in FIG. 3). By making their heights in the Z direction substantially coincide with each other, for example, vibration and impact are applied to the optical recording / reproducing apparatus and thus the optical head transporting apparatus to vibrate the guide means, and the rolling motion around the support center of the guide means in the Y direction. Even if occurs, the center of the light beam and the center of support of the guide means substantially coincide with each other, so that the light beam is not further amplified and vibrated, and can be stabilized against vibration and the like. Further, in the first embodiment, in the Y direction between the center of the light beam in the X direction from the fixed mirror 5 to the movable mirror 6a and the support center of the guide means (that is, the midpoint of the center of the ball 9 in FIG. 3). The positions are almost the same, and the structure is stable in this direction.

Further, according to the first embodiment, the driving force center of the linear motor as the transfer means and the support center of the guide means (that is, the midpoint of the center of the ball 9 in FIG. 3) are made to substantially coincide with each other. As a result, a moment is not generated by the driving force of the linear motor as the transfer means, and smooth driving can be performed.

Further, according to the first embodiment, the center of the driving force of the linear motor as the transfer means and the entire movable portion, that is, the movable unit 6, the movable plate 7, the linear motor coil 13 and the coil holder 14 are used. By making the center of gravity of the entire movable portion substantially coincide with the center of support of the guide means (that is, the midpoint of the center of the ball 9 in FIG. 3), ideal driving can be performed, and the natural vibration of this drive system The frequency is improved and the transfer means can be controlled at high speed and with high accuracy.

Further, according to the first embodiment, the guide means holds the movable unit 6, and the movable plate 7 is provided with the pair of first recesses 7b extending in the X direction, and the first movable portion 7. Recess 7
fixing plate 8 provided with a pair of second recesses 8b extending in the X direction facing b, first recess 7b, and second recess 8b.
Since it is composed of the ball 9 which fits between the ball 9 and the roller 9 and rolls, the parts as the guide means are basically only the movable plate 7, the fixed plate 8 and the balls 9, so that the number of parts is small and the cost is low. Assembly and adjustment can be simplified.

Next, an optical head transfer device according to a second embodiment of the present invention will be described with reference to the drawings.

5 to 8 show a second embodiment of the present invention, FIG. 5 is an exploded perspective view, FIG. 6 is a top view, FIG. 7 is a sectional view taken along line AA ', and FIG. 8 is B. It is a -B 'sectional view.

5 to 8, X direction, Y direction, Z
The directions are the tracking direction, the jitter direction, and the focus direction, respectively, as in FIG. 17 of the conventional example.

Further, the gravity direction of the optical recording / reproducing apparatus constituted by the optical head transfer device and the like is set to the − (minus) Z direction or the ± Y direction.

First, the structure is basically the same as that of FIGS. 1 to 4 of the first embodiment, and the description of the same structure will be omitted.

Reference numeral 8 denotes a fixing plate, which is formed of a stainless steel plate, is screwed and fixed to the main body of the optical recording / reproducing apparatus through a mounting hole 8a, and is X-shaped on both sides in the Y direction so as to face the first recess 7b.
A second concave portion 8b serving as a pair of V-shaped guide portions extending in the direction is provided. Reference numeral 10 denotes a retainer stopper, which is adhered and fixed to the concave portion 8d of the fixed plate 8 by the mounting portion 10d, the retainer stopper portion 10b regulates the movable range of the retainer 9a in the X direction, and the shield cover portion 10c controls the movable plate 7 and the fixed plate 8.
The ball 9 as a moving body covers a portion exposed to the + Z side through a gap formed on the + Z side with respect to the. Note that the gap between the movable plate 7 and the shield cover portion 10c is set so that the load during transfer does not increase (non-contact), there is substantially no scattering of grease, and dust does not enter through the gap. Desirably, specifically, it may be about +50 μm. The material of the retainer stopper 10 may be resin or metal. For example, if the retainer stopper 10 is set to a soft resin having a low Young's modulus, the impact of collision of the retainer 9a can be suppressed.

The operation of the optical head transport device of the second embodiment having the above-mentioned structure will be described below.

The operation is basically similar to that of the first embodiment shown in FIGS. 1 to 4, and only different operation will be described.

The shield cover portion 10c of the retainer stopper 10 covers the portion where the ball 9 is exposed to the + Z side through the gap formed on the + Z side between the movable plate 7 and the fixed plate 8, and the optical recording medium 1 of grease, etc. To prevent splattering.

Usually, dust is accumulated so as to fall in the direction of gravity, but especially when the optical recording / reproducing apparatus and therefore the optical head transfer apparatus is used with the gravity direction set to the − (minus) Z direction. , Retainer stopper 10 on + Z side of ball 9
Since it is covered with the shield cover portion 10c, it is possible to prevent dust from entering from the outside.

As described above, according to the second embodiment, the ball 9 is inserted through the gap formed on the + Z side between the movable plate 7 and the fixed plate 8 in the shield cover portion 10c of the retainer stopper 10.
By but covering a portion exposed to the + Z side, Shirudoka
It is possible to improve the reliability by preventing dust from entering from the outside and preventing grease from scattering to the optical recording medium 1 or the like in a state where the bar portion is unitized with the guide means .

Further, according to the second embodiment, the retainer stopper 10 having the shield cover portion 10c is fixed to the fixed plate 8 so that dust from the outside can enter without increasing the mass of the movable portion. It is possible to prevent the occurrence of grease and to prevent the grease from scattering on the optical recording medium 1 and the like, thereby improving the reliability.

Further, according to the second embodiment, by constructing the retainer stopper 10 having the shield cover portion 10c in which the shield cover and the retainer stopper are integrally formed of the same member, the number of parts and the cost are increased. It is possible to improve reliability by preventing dust from entering from the outside and preventing grease from splashing on the optical recording medium 1 or the like without inviting or increasing the mass of the movable portion. ..

Next, an optical head transfer device according to a third embodiment of the present invention will be described with reference to the drawings.

9 to 12 show a third embodiment of the present invention, FIG. 9 is an exploded perspective view, FIG. 10 is a top view, FIG. 11 is a sectional view taken along line AA ', and FIG. It is a -B 'sectional view.

9 to 12, the X direction, the Y direction,
The Z direction is the tracking direction, the jitter direction, and the focus direction, respectively, as in the conventional example of FIG.

The gravity direction of the optical recording / reproducing apparatus including the optical head transfer device is set to the − (minus) Z direction or the ± Y direction.

First, the structure is basically the same as that of FIGS. 1 to 4 of the first embodiment, and the description of the same structure will be omitted.

Reference numeral 9 denotes a ball as a moving body , which is made of stainless steel, is rotatably inserted into the holding hole of the retainer 9a, and is fitted between the first concave portion 7b and the second concave portion 8b. It is possible to roll in the X direction between the first concave portion 7b and the second concave portion 8b. + Of this retainer 9a
The shield cover portion 9aa is provided on the Z side, and the ball 9 moves to the + side through the gap formed between the movable plate 7 and the fixed plate 8 on the + Z side.
It covers the part exposed to the Z side. In the gap between the shield cover portion 9aa and the movable plate 7 and the fixed plate 8, the load at the time of transfer hardly increases (almost no contact), substantially no grease is scattered, and dust does not enter from the gap. It is desirable to set it to a level of about 50 μm. The material of the retainer 9a may be resin or metal. However, if the retainer 9a is set to a resin having a small friction coefficient, the load will be applied even if the retainer 9a comes into contact with the balls 9 or the movable plate 7 or the fixed plate 8 during transfer. It can be kept small and the weight of the retainer 9a itself can be reduced.

The operation of the optical head transport device of the third embodiment having the above-mentioned structure will be described below.

The operation is basically similar to that of the first embodiment shown in FIGS. 1 to 4, and only different operation will be described.

The shield cover portion 9aa of the retainer 9a covers the portion of the retainer 9a where the ball 9 is exposed to the + Z side through a gap formed on the + Z side between the movable plate 7 and the fixed plate 8. To prevent splattering.

Usually, dust is accumulated so as to fall in the direction of gravity, but especially when the optical recording / reproducing device and therefore the optical head transfer device is used with the direction of gravity set to the − (minus) Z direction. Since the + Z side of the ball 9 is covered with the shield cover portion 9aa of the retainer 9a, it is possible to prevent dust from entering from the outside.

As described above, according to the third embodiment, the ball 9 is moved to the + position via the gap formed on the + Z side between the movable plate 7 and the fixed plate 8 in the shield cover portion 9aa of the retainer 9a.
Shield cover by covering the part exposed to the Z side
The reliability can be improved by preventing dust from entering from the outside and preventing grease from scattering to the optical recording medium 1 or the like in a state where the portion is unitized with the guide means .

Further, according to the third embodiment, by configuring the retainer 9a having the shield cover portion 9aa in which the shield cover and the retainer are integrally formed as the same member, the number of parts and the cost are increased. In addition, it is possible to improve the reliability by preventing dust from entering from the outside and preventing grease from scattering on the optical recording medium 1 or the like.

In the third embodiment, the retainer 9a is used.
Of the movable plate 7 and the fixed plate 8 by the shield cover portion 9aa of
Although the portion where the ball 9 is exposed to the + Z side is covered via the gap formed on the Z side, the same effect can be obtained by forming the shield cover on the movable plate.

Next, an optical head transport device according to a fourth embodiment of the present invention will be described with reference to the drawings.

13 to 16 show a fourth embodiment of the present invention, FIG. 13 is an exploded perspective view, FIG. 14 is a top view, FIG. 15 is a sectional view taken along line AA ′, and FIG. 16 is B. It is a -B 'sectional view.

13 to 16, the X direction, the Y direction, and the Z direction are the tracking direction, the jitter direction, and the focus direction, respectively, as in the conventional example of FIG.

The gravity direction of the optical recording / reproducing apparatus including the optical head transfer device is set to the − (minus) Z direction or the ± Y direction.

First, the structure is basically the same as that of FIGS. 1 to 4 of the first embodiment, and the description of the same structure will be omitted.

Reference numeral 15 is a shield cover, which has a thin plate shape, and is fixed to the fixing plate 8 by adhesion, and the shield cover portion 15b.
The ball 9 covers a portion where the ball 9 is exposed on the + Z side through a gap formed on the + Z side between the movable plate 7 and the fixed plate 8. The holes 15a and 15c are escape holes for the mounting holes 8a and 8c of the fixed plate 8, respectively. The gap between the shield cover portion 15b and the movable plate 7 should be set so that the load during transfer does not increase (non-contact), there is practically no scattering of grease, and dust does not enter through the gap. Desirably, specifically, it may be about +50 μm. Also,
The material of the shield cover 15 may be resin or metal.

The operation of the optical head transporting device of the fourth embodiment having the above structure will be described below.

The operation is basically similar to that of the first embodiment shown in FIGS. 1 to 4, and only different operation will be described.

The shield cover portion 15b of the shield cover 15 covers the portion where the ball 9 is exposed to the + Z side through the gap formed between the movable plate 7 and the fixed plate 8 on the + Z side, and the grease optical recording medium 1 etc. To prevent splattering.

Further, although dust is normally accumulated by dropping in the direction of gravity, even if the optical recording / reproducing apparatus and therefore the optical head transfer apparatus is used with the direction of gravity set to the − ( minus ) Z direction, it is used. , The + Z side of the ball 9 is the shield cover 1
Since it is covered with the shield cover portion 15b of No. 5, it is possible to prevent dust from entering from the outside.

As described above, according to the fourth embodiment, the movable plate 7 is moved by the shield cover portion 15b of the shield cover 15.
By covering a portion where the ball 9 is exposed to the + Z side through a gap formed between the fixing plate 8 and the fixing plate 8, the shield is provided.
In the state where the cover is unitized with the guide means, it is possible to prevent the entry of dust from the outside and prevent the grease from scattering to the optical recording medium 1 or the like, thereby improving the reliability.

Further, according to the fourth embodiment, by fixing the shield cover 15 to the fixed plate 8, it is possible to prevent dust from entering from the outside and to prevent grease from entering without increasing the mass of the movable portion. It is possible to improve the reliability by preventing scattering of the light onto the optical recording medium 1 or the like.

According to the second to fourth embodiments, the shield cover is directly or indirectly (via other components) formed on any one of the movable plate, the fixed plate and the retainer. Since the guide means is fixed, the ball can be covered with the guide means alone, and even if the guide means alone is left for a long time, dust does not enter, so that the purpose can be achieved with the guide means alone.

Further, in the second to fourth embodiments, the shield cover covers the portion where the ball is exposed to the + Z side through the gap formed on the + Z side between the movable plate and the fixed plate. Accordingly, the same effect can be obtained by covering the other direction.

It goes without saying that the second to fourth embodiments also have the effects obtained by the first embodiment.

In the first to fourth embodiments, the movable plate stopper 11 is fixed to the main body of the optical recording / reproducing apparatus to serve as the stopper of the movable plate 7. However, the movable plate 7 itself contacts the retainer 9a. A portion may be provided to serve as a stopper for the movable plate 7.

In the first to fourth embodiments, the movable plate 7, the fixed plate 8 and the balls 9 are made of stainless steel. However, a metal such as aluminum may be used depending on necessity of rigidity. , Resin may be used.

In the first to fourth embodiments, the optical head is separated into a fixed optical unit and a movable optical unit, and the movable optical unit has a movable mirror 6a and an objective lens 6b. Although the transfer device of the separation type optical head in which the objective lens 6b is configured in the movable unit 6 has been described, the present invention is also effective for an integrated optical head configured to transfer the entire optical head as a movable unit.

Further, in the first to fourth embodiments, the focus coil 6e and the tracking coil 6f are fixed to the movable base 6c side, and the magnet 6h is fixed to the mover 6g, that is, the objective lens 6b side, so-called movable. Although the magnet type objective lens driving device is configured inside the movable unit 6, conversely, the focus coil and the tracking coil are fixed to the objective lens side, and the magnet is fixed to the movable base side. The lens driving device may be configured inside the movable unit.

In the first to fourth embodiments, the objective lens 6b is driven in the ± Z direction and the ± X direction to perform the focus control and the tracking control, respectively. However, the entire movable unit is driven. The tracking control may be performed by the transfer means.

In the first to fourth embodiments, the objective lens 6b is driven in the ± Z direction and the ± X direction to perform the focus control and the tracking control, respectively. At least one of the beam condensing means, the light source means of the semiconductor laser, and the detecting means for detecting the reflected light of the optical recording medium of the focus detector and the tracking detector, and the condensing means. May be integrated, and the integrated optical unit may be driven in the ± Z direction and the ± X direction to perform focus control and tracking control, respectively.

Further, in the first to fourth embodiments, the linear motor is constituted by the linear motor magnetic circuit 12 and the linear motor coil 13 as the transfer means, but another transfer means may be used, for example, a stepping motor. The transfer means may be configured.

[0125]

As described above, according to the present invention, the guide means is fixed to the fixed portion of the optical recording / reproducing apparatus on both sides of the objective lens in the jitter direction, thereby the vicinity of the motor for mounting and rotating the optical recording medium. It is not necessary to fix the guide shaft as in the conventional example, the fixed part of the guide shaft is unnecessary between the motor and the movable unit, the movable stroke on the inner peripheral side of the movable unit can be expanded, and the guide means is It is possible to improve reliability by fixing at a part away from the optical recording medium (motor) side resonance and the movable unit (carriage) side resonance, respectively.

Further, according to the present invention, by providing at least a part of the optical path of the light beam reaching the objective lens inside the guide means, at least a part of the movable unit can be configured inside the guide means. At least a part of the height of the guide unit and the height of the movable unit are shared with respect to the focus direction, so that the optical recording / reproducing device can be made thin.

Further, according to the present invention, the ball can roll.
By directly fixing the movable unit to the movable plate provided with the concave portion, the movable unit is directly fixed to the component itself that enables linear movement, that is, the movable plate itself that is a component required for rolling motion. No such carriage is required, the number of parts is reduced, and the weight of the movable part can be reduced.

Further, according to the present invention, by making the heights of the center of the light beam in the tracking direction reaching the objective lens and the center of support of the guide means in the focusing direction substantially coincide with each other, for example, an optical recording / reproducing apparatus and thus an optical head transfer apparatus is provided. Even if the guide means vibrates due to vibration or impact and a rolling motion around the support center of the guide means around the Y direction occurs, the light beam center is substantially coincident with the support center of the guide means. It can be stabilized against vibration and the like without being further amplified and vibrated.

Further, according to the present invention, the driving force center of the transfer means and the support center of the guide means are substantially aligned with each other, so that the generation of the moment due to the driving force of the transfer means is eliminated and the smooth driving can be performed.

Further, according to the present invention, ideal driving can be performed by making the center of driving force of the transfer means and the center of gravity of the entire movable portion including the movable unit substantially coincide with the center of support of the guide means. The natural vibration frequency of the drive system is improved, and the transfer means can be controlled at high speed and with high accuracy.

According to the present invention, the guide means holds the movable unit and is provided with a pair of first recesses extending in the tracking direction, and a movable plate facing the first recesses in the tracking direction. The fixed plate provided with the pair of extended second concave portions and the ball that fits between the first concave portion and the second concave portion and rolls allow the component as the guide means to be formed. Basically, it is only a movable plate, a fixed plate and a ball, so
Inexpensive with a small number of parts and only one guide means
It can be unitized into a unit and can be easily assembled and adjusted.

Further, the present invention has a guide means and a unit.
By covering the part where the ball is exposed to the outside with the shield cover, it is possible to prevent dust from entering from the outside,
The reliability can be improved by preventing the grease from scattering on the optical recording medium or the like.

Further, according to the present invention, by fixing the shield cover covering the portion where the ball is exposed to the outside to the fixed plate, it is possible to prevent dust from entering from the outside without increasing the mass of the movable portion, The reliability can be improved by preventing the grease from scattering on the optical recording medium or the like.

Further, according to the present invention, the retainer itself inserted in the gap between the movable plate and the fixed plate in a state in which the ball is rotatably held covers the portion where the ball is exposed to the outside. The reliability can be improved by preventing dust from entering from the outside and preventing grease from scattering to the optical recording medium or the like without increasing the number of points and increasing the cost.

Further, according to the present invention, the retainer stopper for restricting the movable range of the retainer holding the ball rotatably covers the portion where the ball is exposed to the outside, thereby increasing the number of parts and increasing the cost. It is possible to improve the reliability by preventing dust from entering from the outside and preventing grease from scattering to the optical recording medium or the like without inviting and increasing the mass of the movable portion.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an optical head transfer device according to a first embodiment of the present invention.

FIG. 2 is a top view of the optical head transfer device according to the embodiment.

FIG. 3 is an AA ′ of the optical head transfer device in the embodiment.
Cross section

FIG. 4 is a sectional view taken along line BB ′ of the optical head transfer device in the embodiment.
Cross section

FIG. 5 is an exploded perspective view of an optical head transfer device according to a second embodiment of the present invention.

FIG. 6 is a top view of the optical head transfer device in the embodiment.

FIG. 7 is an AA ′ of the optical head transfer device in the embodiment.
Cross section

FIG. 8 is a sectional view taken along line BB ′ of the optical head transfer device in the embodiment.
Cross section

FIG. 9 is an exploded perspective view of an optical head transfer device according to a third embodiment of the present invention.

FIG. 10 is a top view of the optical head transport device according to the embodiment.

FIG. 11 is an A- of the optical head transfer device in the embodiment.
A'cross section

FIG. 12 B- of the optical head transfer device in the embodiment
B'cross section

FIG. 13 is an exploded perspective view of an optical head transfer device according to a fourth embodiment of the present invention.

FIG. 14 is a top view of the optical head transport device according to the embodiment.

FIG. 15 is an A- of the optical head transfer device in the embodiment.
A'cross section

FIG. 16 is a B- of the optical head transfer device in the embodiment.
B'cross section

17A is a top view of a conventional optical head transfer device, and FIG. 17B is a side view of a conventional optical head transfer device.

[Explanation of Codes] 1 Optical recording medium 3 Motor 6 Movable unit 6a Movable mirror 6b Objective lens 7 Movable plate 7b First concave portion 8 Fixed plate 8b Second concave portion (guide portion) 9 Ball (moving body) 9a Retainer 9aa Shield Cover part 10 Retainer stop 10c Shield cover part 12 Linear motor magnetic circuit 13 Linear motor coil 15 Shield cover 15b Shield cover part

Claims (17)

[Claims] 1. A movable unit having an objective lens for converging a light beam on an arbitrary information track of an optical recording medium, and a driving force for moving the movable unit in a direction orthogonal to the information track. The optical recording / reproducing apparatus includes a transfer unit and a guide unit for movably supporting the movable unit in a direction orthogonal to the information track, the guide unit being tangential to the information track on both sides of the center of the objective lens. An optical head transfer device, characterized in that the optical head transfer device is fixed to the fixing part of 2. A guide means holds a movable unit and is provided with a pair of first concave portions extending in a direction orthogonal to the information track, and a movable plate facing the first concave portion. A fixed plate provided with a pair of second recesses extending in a direction orthogonal to the track; and a ball that fits between the first recess and the second recess and rolls. 2. The optical head transfer device according to claim 1, wherein the fixing plate is fixed to the fixing portion of the optical recording / reproducing device on both sides of the objective lens center in the tangential direction of the information track. 3. A movable unit having an objective lens for condensing a light beam on an arbitrary information track of an optical recording medium, and a driving force for moving the movable unit in a direction orthogonal to the information track. The information track of a guide portion, which includes a transfer means and a guide means for movably supporting the movable unit in a direction orthogonal to the information track, and which guides a moving body that makes a rolling motion or a sliding motion of the guide means; An optical head transfer device, characterized in that it is fixed to a fixed portion of an optical recording / reproducing device within a range of a length in a direction orthogonal to each other. 4. The guide means holds the movable unit and is provided with a pair of first recesses extending in a direction orthogonal to the information track, and the information facing the first recess. A fixed plate provided with a pair of second recesses extending in a direction orthogonal to the track; and a ball that fits between the first recess and the second recess and rolls. 4. The optical head transfer device according to claim 3, wherein the second concave part for guiding the ball is fixed to a fixed part of the optical recording / reproducing device within a range of a length in a direction orthogonal to the information track. 5. A movable unit provided with an objective lens for condensing a light beam on an arbitrary information track of an optical recording medium, and a transfer means for generating a driving force for transferring the movable unit in a direction orthogonal to the information track. And guide means for movably supporting the movable unit in a direction orthogonal to the information track, and at least a part of an optical path of a light beam reaching the objective lens is provided inside the guide means. Optical head transfer device. 6. The guide means holds the movable unit and is provided with a pair of first recesses extending in a direction orthogonal to the information track, and a movable plate facing the first recess. A fixed plate provided with a pair of second recesses extending in a direction orthogonal to the track; and a ball that fits between the first recess and the second recess and rolls. At least a part of an optical path of a light beam reaching an objective lens is provided between the movable plate and the fixed plate.
The optical head transfer device described. 7. A movable unit equipped with an objective lens for converging a light beam on an arbitrary information track of an optical recording medium, and a transfer means for generating a driving force for transferring the movable unit in a direction orthogonal to the information track. And holding the movable unit and extending in a direction orthogonal to the information track.
A movable plate provided with a pair of first recesses, and 1 extending in a direction orthogonal to the information track facing the first recesses.
The movable unit is directly fixed to the movable plate, including a fixed plate provided with a pair of second concave portions, and a ball that fits between the first concave portion and the second concave portion and rolls. An optical head transfer device characterized in that 8. A movable unit provided with an objective lens for condensing a light beam on an arbitrary information track of an optical recording medium, and a transfer means for generating a driving force for transferring the movable unit in a direction orthogonal to the information track. And a guide means for movably supporting the movable unit in a direction orthogonal to the information track, and a light beam center in a direction orthogonal to the information track reaching the objective lens and a support center of the guide means. An optical head transfer device, wherein heights in a direction perpendicular to the optical recording medium are substantially matched. 9. The guide means holds the movable unit and is provided with a pair of first recesses extending in a direction orthogonal to the information track, and a movable plate facing the first recess. A fixed plate provided with a pair of second recesses extending in a direction orthogonal to the track; and a ball that fits between the first recess and the second recess and rolls. 9. The light according to claim 8, wherein the height of the center of the light beam in the direction orthogonal to the information track reaching the objective lens and the center of the ball are substantially the same in the direction perpendicular to the optical recording medium. Head transfer device. 10. A movable unit having an objective lens for focusing a light beam on an arbitrary information track of an optical recording medium,
The transfer unit includes a transfer unit that generates a driving force that transfers the movable unit in a direction orthogonal to the information track, and a guide unit that movably supports the movable unit in a direction orthogonal to the information track. An optical head transfer device characterized in that the center of driving force and the center of support of the guide means are substantially aligned. 11. A guide means holds a movable unit,
A movable plate provided with a pair of first recesses extending in a direction orthogonal to the information track, and a pair of second recesses facing the first recess and extending in a direction orthogonal to the information track. And a ball that fits between the first recess and the second recess and rolls, and the center of the driving force of the transfer means and the center of support of the guide means are formed. 11. The optical head transport device according to claim 10, wherein the optical head transport devices are substantially matched with each other. 12. A movable unit having an objective lens for focusing a light beam on an arbitrary information track of an optical recording medium,
The transfer unit includes a transfer unit that generates a driving force that transfers the movable unit in a direction orthogonal to the information track, and a guide unit that movably supports the movable unit in a direction orthogonal to the information track. An optical head transfer device, wherein the center of driving force and the center of gravity of the entire movable portion that is driven integrally with the movable unit are substantially aligned with the center of support of the guide means. 13. The guide means holds the movable unit,
A movable plate provided with a pair of first recesses extending in a direction orthogonal to the information track, and a pair of second recesses facing the first recess and extending in a direction orthogonal to the information track. And a ball that fits between the first recess and the second recess and rolls, and is driven integrally with the center of the driving force of the transfer means and the movable unit. 13. The optical head transfer device according to claim 12, wherein the center of gravity of the entire movable part and the support center of the guide means are substantially aligned with each other. 14. A movable unit having an objective lens for focusing a light beam on an arbitrary information track of an optical recording medium,
A transfer unit that generates a driving force that transfers the movable unit in a direction orthogonal to the information track, and a pair of first recesses that holds the movable unit and extend in a direction orthogonal to the information track are provided. A movable plate, a fixed plate provided with a pair of second recesses facing the first recess and extending in a direction orthogonal to the information track, the first recess and the second recess A ball that fits between and rolls,
An optical head transfer device comprising: a shield cover that covers at least a part of a portion where the ball is exposed to the outside. 15. A movable unit having an objective lens for focusing a light beam on an arbitrary information track of an optical recording medium,
A transfer unit that generates a driving force that transfers the movable unit in a direction orthogonal to the information track, and a pair of first recesses that holds the movable unit and extend in a direction orthogonal to the information track are provided. A movable plate, a fixed plate provided with a pair of second recesses facing the first recess and extending in a direction orthogonal to the information track, the first recess and the second recess A ball that fits between and rolls,
An optical head transfer device, comprising: a shield cover fixed to the fixing plate and covering at least a part of a portion where the ball is exposed to the outside. 16. A movable unit having an objective lens for focusing a light beam on an arbitrary information track of an optical recording medium,
A transfer unit that generates a driving force that transfers the movable unit in a direction orthogonal to the information track, and a pair of first recesses that holds the movable unit and extend in a direction orthogonal to the information track are provided. A movable plate, a fixed plate provided with a pair of second recesses facing the first recess and extending in a direction orthogonal to the information track, the first recess and the second recess A ball that fits between and rolls,
An optical head, comprising: a retainer that is inserted into a gap between the movable plate and the fixed plate while holding the ball rotatably and that covers at least a part of a portion where the ball is exposed to the outside. Transfer device. 17. A movable unit having an objective lens for focusing a light beam on an arbitrary information track of an optical recording medium,
A transfer unit that generates a driving force that transfers the movable unit in a direction orthogonal to the information track, and a pair of first recesses that holds the movable unit and extend in a direction orthogonal to the information track are provided. A movable plate, a fixed plate provided with a pair of second recesses facing the first recess and extending in a direction orthogonal to the information track, the first recess and the second recess A ball that fits between and rolls,
A retainer inserted into the gap between the movable plate and the fixed plate while holding the ball rotatably, and a movable range of the retainer, and at least a part of the portion where the ball is exposed to the outside. An optical head transfer device comprising a retainer cover for covering.