JPH0773477A - Optical head device and access mechanism for the head device - Google Patents

Abstract

(57) [Abstract] [Objective] The object of the present invention is to have light weight and high rigidity,
An object is to provide an optical head device capable of high-speed access and an access device for high-speed access. In the optical head device of the present invention, all the elements, that is, the semiconductor laser 30, the objective lens 12, the optical elements 34, 36 and 3 are provided.
Carriage in which 8, 40, 42, 50, 54, photodetectors 44, 52, 58, voice coil 22, and roller 28 are integrally incorporated
The center of movement (stress) as the 20 is moved is aligned with the center of gravity when these elements are incorporated into the carriage 20. Elements such as the laser, the optical element, and the photodetector are provided between the voice coil 22 and the optical disc D.
Are arranged so as to be orthogonal to the recording surface of.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device, and more particularly to an optical head device for recording information on an optical disk and reading information from the optical disk, and a head access mechanism for moving the head device.

[0002]

2. Description of the Related Art An optical head device irradiates a semiconductor laser as a light source and a laser beam emitted from the laser onto a recording surface of an optical disk and reflects the laser beam reflected by the recording surface of the optical disk. It includes an optical element group that guides the beam to the photodetector, an access mechanism that moves the optical element group in a direction parallel to the recording surface of the optical disk and orthogonal to the tracks formed on the recording surface.

The access mechanism is arranged around a guide shaft for movably supporting the structure through a supported member such as a bearing or a slider extending from the structure for holding the optical element group. , A magnetic circuit that provides a magnetic field corresponding to the thrust from a thrust generator such as a coil formed integrally with the structure.

In many optical head devices today, in order to reduce the thickness of the device itself, the optical element group is arranged parallel to the recording surface of the optical disk. Also, the access mechanism is
For the same reason, it is arranged in the vicinity of the surface on which the optical element group is arranged so as to extend in a plane parallel to the recording surface of the optical disc.

[0005]

However, the fact that the group of optical elements, that is, the structure, is arranged in a plane parallel to the recording surface of the optical disk is such that the size of the structure (orthogonal to the recording surface of the optical disk is orthogonal to the size of the structure. There is a problem of increasing the area viewed from the direction) and the weight.

Increasing the size (area) of the structure has the problem of reducing the rigidity of the structure and the resonance frequency (when the structure is moved). Further, since the weight is imaged, there is a problem that the access mechanism has to be further enlarged.

On the other hand, moving a structure having a low rigidity and a low resonance frequency at a high speed has a problem of causing an unwanted vibration in the structure and reducing the recording density. An object of the present invention is to provide an optical head device which is lightweight and has high rigidity, which enables high-speed access, and an access device which allows high-speed access.

[0008]

SUMMARY OF THE INVENTION The present invention has been made based on the above-mentioned problems, and includes a light source, an optical element that guides the light from the light source toward a recording medium, and the optical element that is guided through the optical element. The lens for converging the reflected light at a predetermined position on the recording medium, the light detecting means for detecting the light reflected by the recording medium, the light detecting means, the lens, the optical element and the light source Holding means for integrally holding along the orthogonal surface orthogonal to the recording surface of the medium, and the holding means so as to sandwich the light detecting means, the lens, the optical element and the light source with the orthogonal surface as an axis of symmetry. (EN) An optical head device having an integrally arranged drive means for generating thrust for moving the holding means in a direction parallel to the recording surface of the recording medium.

According to the present invention, the light source, the optical element for guiding the light from the light source toward the recording medium, and the light guided through the optical element are focused on a predetermined position of the recording medium. The lens, the light detection means for detecting the light reflected by the recording medium, and the light detection means, the lens, the optical element, and the light source with the orthogonal plane orthogonal to the recording surface of the recording medium as the axis of symmetry. Holding means for integrally holding driving means for generating thrust having a predetermined directionality, which is arranged so as to sandwich the recording medium, along the orthogonal plane orthogonal to the recording surface of the recording medium, and the driving of the holding means. And a magnetic field generating means for providing a magnetic field that acts on the thrust generated from the means.

Further, according to the present invention, a predetermined weight,
A light source having a volume and a density, an optical element having a predetermined weight, a volume and a density, which guides light from the light source toward a recording medium, and an optical element having a predetermined weight, a volume and a density. A lens for focusing the light guided through the element at a predetermined position on the recording medium; a light detecting means for detecting the light reflected by the recording medium, the light having a predetermined weight, volume and density; Holding means for integrally holding the light detecting means, the lens, the optical element and the light source along an orthogonal surface orthogonal to the recording surface of the recording medium, and a predetermined weight, volume and density. It is formed to have a weight, a volume and a density, and is arranged integrally with the holding means so as to sandwich the light detection means, the lens, the optical element and the light source with the orthogonal plane as a symmetry axis, and the holding means records the data. Medium Drive means for generating a thrust for moving in a direction parallel to the recording surface, and the stress center when the holding means is moved, the light source, the optical element, the lens, and the light detection means. By appropriately setting the weight, volume and density of each of the driving means, each of the light source, the optical element, the lens, the light detecting means, and the driving means has the holding means. There is provided an optical head device characterized in that the center of gravity of the optical head device when the optical head device is incorporated into the optical head device is matched.

Furthermore, according to the present invention, a light source,
An optical element that guides the light from the light source toward the recording medium, a lens that focuses the light guided through the optical element to a predetermined position on the recording medium, and a light that is reflected by the recording medium is detected. And a photodetection unit that uses the orthogonal plane orthogonal to the recording surface of the recording medium as an axis of symmetry,
Holding for integrally holding the lens, the optical element, and the light source, and driving means for generating a thrust having a predetermined directionality along an orthogonal surface orthogonal to the recording surface of the recording medium. Means and, in a state of being orthogonal to the orthogonal surface and seen from a direction parallel to the recording surface of the recording medium, with respect to the holding means, arranged in a point-symmetrical position,
There is provided an optical head device having a supporting unit that supports the holding unit so as to be movable along a direction orthogonal to the orthogonal plane and parallel to the recording surface of the recording medium.

Furthermore, according to the present invention, a light source,
An optical element that guides the light from the light source toward the recording medium, a lens that focuses the light guided through the optical element to a predetermined position on the recording medium, and a light that is reflected by the recording medium is detected. And a photodetection unit that uses the orthogonal plane orthogonal to the recording surface of the recording medium as an axis of symmetry,
Holding for integrally holding the lens, the optical element, and the light source, and driving means for generating a thrust having a predetermined directionality along an orthogonal surface orthogonal to the recording surface of the recording medium. Means, magnetic field generating means for providing a magnetic field that acts on the thrust generated from the driving means of the holding means, as viewed from a direction orthogonal to the orthogonal plane and parallel to the recording surface of the recording medium, With respect to the holding means, the holding means are arranged at positions symmetrical with respect to each other,
There is provided an access mechanism having a support unit that is movably supported along a direction orthogonal to the orthogonal plane and parallel to the recording surface of the recording medium.

Further, according to the present invention, a light source,
An optical element group that includes an optical element that transmits light by at least two total reflections and that guides the light from the light source toward the recording medium, and the light that is guided through the optical element group in the predetermined recording medium. , A lens for converging the light at the position of the recording medium, a light detecting means for detecting the light reflected by the recording medium, and an orthogonal surface orthogonal to the recording surface of the recording medium as an axis of symmetry, the light detecting means, the lens, the optical element. An optical device having a holding means for holding the element and the light source in a sandwiched manner, and a driving means for generating a thrust having a predetermined directionality, along with an orthogonal surface orthogonal to the recording surface of the recording medium. A head device is provided.

Furthermore, according to the present invention, a light source,
An optical element that guides the light from the light source toward the recording medium, a lens that focuses the light guided through the optical element to a predetermined position on the recording medium, and a light that is reflected by the recording medium is detected. And a photodetection unit that uses the orthogonal plane orthogonal to the recording surface of the recording medium as an axis of symmetry,
Holding for integrally holding the lens, the optical element, and the light source, and driving means for generating a thrust having a predetermined directionality along an orthogonal surface orthogonal to the recording surface of the recording medium. Means, first magnetic field generating means for providing a magnetic field acting on the thrust generated by the driving means, the first magnetic field generating means being disposed at a position where the holding means does not come into contact with the driving means. The drive means is penetrated, and the second magnetic field generation means is provided so as to be rotatable around one end of the first magnetic field generation means as a fulcrum and provides a magnetic field that acts on the thrust generated from the drive means. An access mechanism is provided.

[0015]

According to the optical head device of the present invention, the optical element for guiding the light from the light source toward the recording medium, the lens for converging the guided light at a predetermined position of the recording medium, and the reflection by the recording medium. The light detecting means for detecting the emitted light and the driving means for generating the thrust having a predetermined directionality are integrally held along the orthogonal surface orthogonal to the recording surface of the recording medium. Therefore, an optical head device and an access mechanism which are lightweight and have high rigidity and which can be accessed at high speed are provided.

Further, the stress center when the holding means is moved, and the weight, volume and density of each of the light source, the optical element, the lens, the light detecting means and the driving means are appropriately set. By doing so, the center of gravity of each of the light source, the optical element, the lens, the light detecting means, and the driving means when they are incorporated into the holding means coincides with each other. Provided is an optical head device that does not cause significant vibration.

[0017]

1 and 2 schematically show an optical head device in which an embodiment of the present invention is used. According to FIGS. 1 and 2, the optical head device 2 includes an optical head unit 1 for irradiating a recording medium, that is, a recording surface of an optical disc D with an optical beam.
0, a carriage integrally formed with the optical head unit 10 and movable along a track on the recording surface of the optical disc D
20, a pair of magnetic circuits 24 that provide a predetermined magnetic field to the carriage 20, a pair of guide shafts 26 that guide the carriage 20, and many optical elements that will be described later and are housed in the carriage 20. There is.

The optical head unit 10 irradiates the optical disc D with a laser beam and takes out the laser beam reflected by the optical disc D.
A track coil 14 that generates thrust that moves 12 in a direction orthogonal to the track formed on the recording surface of the optical disc D, that is, a tracking direction, and a thrust that moves 12 in a direction orthogonal to the recording surface of the optical disc D, that is, a focus direction. The focus coil 16 and the actuator 18 that integrally houses the lens 12 and the coils 14 and 16 are provided.

A pair of voice coils 22 for generating thrust for moving the carriage 20 along the guide shaft 26 are arranged on the carriage 20 at positions substantially symmetrical with respect to the center line of the carriage 20.

The magnetic circuit 24 includes an inner yoke 24a and an outer yoke.
24c, and a magnet 24b arranged on the inner side surface of the outer yoke 24c. The inner yoke 24a and the outer yoke 24c are separated via a dividing line 24p, and the inner yoke 24a is rotatably formed via a fulcrum 24s arranged at one end. That is, the carriage 20 has the inner yoke 24a.
By being rotated, it is inserted into the magnetic circuit 24. still,
The outer yoke 24c is fixed to a housing portion (not shown).

The guide shaft 26 is arranged so as to sandwich the carriage 20 in each of the vertical direction and the width direction. That is, the guide shafts 26 are arranged in pairs in a substantially point-symmetrical relationship with respect to the cross-sectional direction along which the carriage 20 is moved. The carriage 20 is movably mounted on the guide shaft 26 via a roller 28 located at one end of the upper surface of the carriage 20 and at the opposite end of the lower surface.

In the space near the center of the carriage 20 and sandwiched by the pair of voice coils 22, a semiconductor laser 3 for generating a laser beam for irradiating the optical disk D is produced.
0, an entrance prism 34 for removing the elliptical component of the laser beam from the laser 30, the exit surface of this prism 34,
A beam splitter 36 for separating the laser beam directed to the optical disc D and the laser beam reflected by the optical disc,
The parallel prism 38 that guides the laser beam that has passed through the beam splitter 36 to the objective lens 12 by the two total reflections, the light transmission system (direction from the laser 12 to the optical disc D) and the detection system (from the optical disc D). (Return to beam splitter 36)
A .lambda. / 4 plate 40 and the like for matching the isolation with the are sequentially arranged in the direction perpendicular to the recording surface of the optical disc D. As is clear from FIG. 2, the parallel prism
38 is arranged so as to offset the laser beam emitted from the laser 30 toward one voice coil 22 side.

In the direction in which the laser beam from the laser 30 is reflected via the beam splitter 36, a laser power detector 44 (the lens 42 is integrated with the lens 42 for monitoring the output of the laser 30). Are formed). The laser power detector 44 is arranged at a predetermined angle with respect to the optical axis of the beam splitter 36.

The optical disc D is passed through the beam splitter 36.
In the direction where the reflected laser beam reflected by
A beam splitting surface 48a (formed by the prism 46 and the prism 48) for splitting the reflected laser beam reflected by the optical disc D into a first beam used for track control and a second beam used for focus control and information reproduction. A tracking detector 52 for converting the first beam into an electric signal, a focus detector 58 for converting the second beam into an electric signal, and the like. A convex lens 50 is provided between the beam split surface 48a and the tracking detector 52, and the convex lens 50 is provided between the beam split surface 48a and the focus detector 58.
A lens 54 and a parallel plate element 56 for giving a predetermined characteristic of the laser beam are respectively disposed between and.

FIG. 3 shows the positional relationship between the elements arranged inside the carriage 20 and the carriage 20 main body. According to FIG. 3 (a), the paired voice coil 22 is
They are arranged substantially symmetrically with the plane including the optical head unit 10 as the axis of symmetry. Further, according to FIG. 3B, the optical head unit
As described above, the optical element group that guides the laser beam toward the objective lens 12 of 10 is disposed along the surface including the center line of the carriage 20 in the space sandwiched by the voice coils 22. To be done.

By the way, according to FIGS. 3A and 3B, the center of gravity of the optical head unit 10, the voice coil 22 and the optical element group are defined (aligned) in a state where they are incorporated in the carriage 20, respectively. ) Is configured. That is, after the carriage 20 is formed as a single unit, the optical head unit 1
0, not only incorporating the voice coil 22 and the optical element group, but after calculating the weight, volume and density of all the elements in advance, the center of movement (stress) when the carriage 20 is moved and the center of gravity match. After the shapes and materials of all the elements are selected, they are assembled.

Table 1 shows the weight, volume and density of representative elements. In Table 1, the item number "-" in the first column (the leftmost column) does not necessarily mean that the classification and designation of the element alone are the same as those of the elements shown in FIGS. 1 to 3. Shows.

By defining the shape and material of each element in this way, the center of movement (stress) when the carriage 20 is moved and the center of gravity are aligned, so that the carriage 20 is moved along the guide shaft 26. The unwanted vibrations that occur in the carriage 20 are eliminated.

FIG. 4 schematically shows the optical head device and the signal processing circuit shown in FIGS. 1 to 3.
When used in the reproduction state, a semiconductor laser 30 driven through the laser driving circuit 64 generates a laser beam having a predetermined light intensity. This laser beam is corrected to have a substantially circular cross-sectional shape through an entrance prism 34, is then guided to a beam splitter 36, and is directed toward an optical disc D by a first beam splitting surface 36a (34b). -The beam and the laser beam directed to the laser power detector 44.

First beam splitting surface 36a (34b)
Then, the laser beam reflected toward the laser power detector 44 has its light intensity detected through the detector 44 and is input to the laser output automatic adjustment circuit (APC) 62. APC62
Then, according to the output from the detector 44, the laser drive circuit 64
To a predetermined output level.

The laser beam which has passed through the first beam splitting surface 36a (34b) passes through the parallel prism 38 to form a laser beam.
Is guided to the λ / 4 plate 40 by total internal reflection, and the objective lens 12
Is incident on the optical disc D and is focused by the objective lens 12, and then the optical disc D is irradiated.

The laser beam guided to the optical disk D is
The intensity is modulated according to the presence / absence of information (that is, pits) recorded on the recording surface, and the intensity is returned to the objective lens 12 again. The reflection laser beam returned to the objective lens 12 is again λ /
After passing through the four plates 40 and the parallel prism 38 in the reverse order, they are returned to the beam splitting surface 36a (34b).

The reflected laser beam returned to the beam split surface 36a (34b) is the beam split surface 36a (34b).
The second beam splitting surface 48a after being reflected by b)
It is guided to (46b), divided into two laser beams by the beam splitting surface 48a (46b), and imaged on the track detector 52 and the focus detector 58, respectively.

Track detector 52 and focus detector 58
Each of the reflected laser beams guided to the above is converted into an electric signal corresponding to the size of the beam spot, and is supplied to the track control circuit 72 and the focus control circuit 70 for focus control of the objective lens 12. And used for truck control. The reflection laser beam guided to the focus detector 58 is also supplied to the information reproducing circuit 68 and output as information recorded on the optical disk D to a host computer (not shown) or the like.

In this case, the optical head unit 10 includes the magnetic circuit 24.
And along the guide shaft 26, in parallel with the recording surface of the optical disc D, in a direction traversing the tracks on the recording surface, accompanied by undesired vibration depending on the position of the track on which the data to be read is recorded. It is moved at high speed without.

On the other hand, when it is used in the recording state, the recording data supplied through the recording signal generating circuit 66 is used.
A semiconductor laser 30 generates a recording laser beam whose light intensity is changed by a laser driving circuit 64 which is driven according to the laser.

This recording laser beam comprises an entrance prism 34.
After the cross-sectional shape is corrected to a substantially circular shape through
The beam splitting surface 36a (34b) splits the laser beam toward the optical disk D and the laser beam toward the laser power detector 44.

First beam splitting surface 36a (34b)
Then, the light intensity of the laser beam reflected toward the laser power detector 44 is detected through the detector 44 and is input to the APC 62 as the output of the reference laser beam. APC
According to 62, the reference output level of the recording laser beam is fed back to the laser drive circuit 64 according to the output from the detector 44.

The laser beam which has passed through the first beam splitting surface 36a (34b) passes through the parallel prism 38 and is projected to the laser beam.
Is guided to the λ / 4 plate 40 by total internal reflection, and the objective lens 12
Is incident on the optical disc D and is focused by the objective lens 12, and then the optical disc D is irradiated.

The laser beam guided to the optical disk D is
A laser beam is formed along the track formed on the recording surface.
After forming a pit having a size or a change in reflectance according to the intensity of the beam, it is returned to the objective lens 12 again.

The reflection laser beam returned to the objective lens 12 again passes through the λ / 4 plate 40 and the parallel prism 38 in the reverse order, and is returned to the beam splitting surface 36a (34b).
The reflected laser beam returned to the beam splitting surface 36a (34b) is reflected by the beam splitting surface 36a (34b) and then guided to the second beam splitting surface 48a (46b), where the beam is emitted. The split surface 48a (46b) divides the laser beam into two laser beams, each of which has a track detector 52.
And an image is formed on the focus detector 58.

Track detector 52 and focus detector 58
Each of the reflected laser beams guided to the above is converted into an electric signal corresponding to the size of the beam spot, and is supplied to the track control circuit 72 and the focus control circuit 70 for focus control of the objective lens 12. And used for truck control.

In this case, the optical head unit 10 includes the magnetic circuit 24.
And, along the guide shaft 26, in parallel with the recording surface of the optical disc D, in the direction crossing the tracks of the recording surface, accompanied by undesired vibration depending on the position of the track to be recorded on the recording surface of the optical disc D. It is moved at high speed.

[0044]

[Table 1] Table 1 is a list showing the weight, volume and density of representative elements.

[0045]

As described above, according to the optical head device of the present invention, the optical element that guides the light from the light source toward the recording medium, and the guided light is focused on a predetermined position of the recording medium. The lens, the light detecting means for detecting the light reflected by the recording medium, and the driving means for generating the thrust having a predetermined directivity are integrally formed along an orthogonal surface orthogonal to the recording surface of the recording medium. Held in. Therefore, an optical head device and an access mechanism which are lightweight and have high rigidity and which can be accessed at high speed are provided.

Further, the stress center when the holding means is moved, and the weight, volume and density of each of the light source, the optical element, the lens, the light detecting means and the driving means are appropriately set. By doing so, the center of gravity of each of the light source, the optical element, the lens, the light detecting means, and the driving means when they are incorporated into the holding means coincides with each other. Provided is an optical head device that does not cause significant vibration. From this, the recording density is improved.

[Brief description of drawings]

FIG. 1 is a schematic view showing an optical head device and an access device according to an embodiment of the present invention.

2 is a schematic cross-sectional view of the optical head device and the access device shown in FIG. 1 as seen from the direction of the arrow in FIG.

3 is an exploded view showing elements of the optical head device shown in FIGS. 1 and 2. FIG.

FIG. 4 is a schematic block diagram showing an optical head device and a signal processing circuit shown in FIGS. 1 to 3.

[Explanation of symbols]

2 ... Optical head device, 10 ... Optical head part, 12 ... Objective lens, 14 ... Track coil, 16 ... Focus coil, 18 ...
Actuator, 20 ... Carriage, 22 ... Voice coil, 24
... magnetic circuit, 26 ... guide shaft, 28 ... roller, 30 ... semiconductor laser, 34 ... incident prism, 36 ... beam splitter, 38 ... parallel prism, 40 ... λ / 4 plate, 42 ... lens, 44
Laser power detectors, 46 and 48 ... Prism, 50 ... Convex lens, 52 ... Tracking detector, 54 ... Lens, 56 ... Parallel plate element, 58 ... Focus detector, 60 ... Signal control unit, 62
… Laser output automatic adjustment circuit, 64… Laser drive circuit, 66…
Recording signal generating circuit, 68 ... Information reproducing circuit, 70 ... Focus control circuit, 72 ... Track control circuit, D ... Optical disc.

Claims (7)

[Claims] 1. A light source, an optical element that guides light from the light source toward a recording medium, a lens that focuses the light guided through the optical element to a predetermined position on the recording medium, and the recording element. Holding for integrally holding the light detecting means for detecting the light reflected by the medium, the light detecting means, the lens, the optical element, and the light source along an orthogonal surface orthogonal to the recording surface of the recording medium. And the holding means so as to sandwich the light detection means, the lens, the optical element, and the light source with the orthogonal plane as a symmetry axis, and the holding means is parallel to the recording surface of the recording medium. An optical head device comprising: a drive unit that generates thrust for moving in any direction. 2. A light source, an optical element that guides light from the light source toward a recording medium, and a lens that focuses the light guided through the optical element at a predetermined position on the recording medium.
Light detection means for detecting the light reflected by the recording medium,
With a symmetry axis being an orthogonal plane orthogonal to the recording surface of the recording medium, the light detecting means, the lens, the optical element, and the light source are arranged so as to sandwich the driving means for generating thrust having a predetermined directionality. Holding means integrally holding the recording medium along an orthogonal surface orthogonal to the recording surface of the recording medium, and magnetic field generating means for providing a magnetic field that acts on the thrust generated from the driving means of the holding means, Access mechanism to have. 3. A light source having a predetermined weight, volume and density, an optical element having a predetermined weight, volume and density and guiding light from the light source toward a recording medium, a predetermined weight, A lens that has a volume and a density and focuses the light guided through the optical element to a predetermined position on the recording medium, and a light that has a predetermined weight, volume and density and is reflected by the recording medium. With a predetermined weight, volume, and density, the light detecting means, the lens, the optical element, and the light source are integrally formed along an orthogonal surface orthogonal to the recording surface of the recording medium. Holding means for holding the light detecting means, the lens, the optical element and the light source so as to sandwich the light detecting means, the lens, the optical element and the light source with the orthogonal plane as a symmetry axis. Arranged , The holding means and a driving means for generating a thrust for moving the recording surface parallel to the direction of the recording medium, and the stress center when the holding means is moved, the light source,
By appropriately setting the weight, volume, and density of each of the optical element, the lens, the light detecting unit, and the driving unit, the light source, the optical element, the lens, the light detecting unit, And an optical head device in which the center of gravity of each of the driving means incorporated in the holding means is matched. 4. A light source, an optical element that guides light from the light source toward a recording medium, and a lens that focuses the light guided through the optical element at a predetermined position on the recording medium.
Light detection means for detecting the light reflected by the recording medium,
With a symmetry axis being an orthogonal plane orthogonal to the recording surface of the recording medium, the light detecting means, the lens, the optical element, and the light source are arranged so as to sandwich the driving means for generating thrust having a predetermined directionality. Holding means for integrally holding along a plane perpendicular to the recording surface of the recording medium, and the holding means in a state orthogonal to the orthogonal surface and viewed in a direction parallel to the recording surface of the recording medium. With respect to the above, an optical head device comprising: a supporting unit that is arranged at a point-symmetrical position and that supports the holding unit so as to be movable along a direction orthogonal to the orthogonal plane and parallel to the recording surface of the recording medium. . 5. A light source, an optical element that guides light from the light source toward a recording medium, and a lens that focuses the light guided through the optical element at a predetermined position on the recording medium.
Light detection means for detecting the light reflected by the recording medium,
With a symmetry axis being an orthogonal plane orthogonal to the recording surface of the recording medium, the light detecting means, the lens, the optical element, and the light source are arranged so as to sandwich the driving means for generating thrust having a predetermined directionality. Holding means for integrally holding along an orthogonal surface orthogonal to the recording surface of the recording medium; magnetic field generating means for providing a magnetic field that acts on the thrust generated from the driving means of the holding means; When viewed from a direction orthogonal to the plane and parallel to the recording surface of the recording medium, the holding means is arranged in a point-symmetrical position with respect to the holding means. An access mechanism having a support means that supports the recording surface so as to be movable along a direction parallel to the recording surface. 6. An optical element group including a light source and an optical element that transmits light by at least two total reflections, and an optical element group that guides the light from the light source toward a recording medium; A lens that focuses the reflected light on a predetermined position of the recording medium, a light detection unit that detects the light reflected by the recording medium, and a light detection unit that detects the light reflected by the recording medium. A detection unit, the lens, the optical element, and a driving unit that is disposed so as to sandwich the light source and that generates a thrust having a predetermined directional property are integrally formed along an orthogonal surface orthogonal to the recording surface of the recording medium. Holding means for holding,
An optical head device having: 7. A light source, an optical element that guides light from the light source toward a recording medium, and a lens that focuses the light guided through the optical element at a predetermined position on the recording medium.
Light detection means for detecting the light reflected by the recording medium,
With a symmetry axis being an orthogonal plane orthogonal to the recording surface of the recording medium, the light detecting means, the lens, the optical element, and the light source are arranged so as to sandwich the driving means for generating thrust having a predetermined directionality. A holding means for integrally holding the recording medium along an orthogonal surface orthogonal to the recording surface of the recording medium, and a position that does not contact the driving means of the holding means, and is generated by the driving means. The first magnetic field generating means for providing a magnetic field acting on the thrust and the driving means of the holding means are penetrated, and the first magnetic field generating means is rotatably formed with one end of the first magnetic field generating means as a fulcrum. Second magnetic field generating means for providing a magnetic field that acts on the thrust generated from the access mechanism.