JPH11213436A - Optical pickup device for both-side access - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical pickup device for both-side access for increasing a recording capacity further without damaging the merit of the shortness of the time required for recording information and reproducing the information in the combination of an optical recording medium and the optical pickup device. SOLUTION: This device is provided with a supporting pedestal 11 provided with an extension end part extended from a base end part freely turnably arranged near an optical disk 100 and moved along the radial direction of the optical disk between a suspension position on the outer part of the peripheral edge of the optical disk and an operation position facing the surface of the optical disk accompanying the turning of the base end part, a supporting pedestal moving means 101 for moving the supporting pedestal in both directions A along the rotation center line of the optical disk and an optical circuit provided on the supporting pedestal for irradiating a beam light from a light source from the extension end part in both directions while the extension end part is arranged at the operation position, recording the information to the corresponding recording layers 100a and 100b of the optical disk and reproducing the information from the recording layers 100a and 100b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided access optical pickup device capable of accessing both sides of a rotating optical recording medium.

[0002]

2. Description of the Related Art This type of double-sided access optical pickup device is known, for example, from Japanese Patent Application Laid-Open No. Hei 2-206037. This conventional double-sided access optical pickup device discloses a pair of optical heads facing both sides of one optical recording medium.

[0003]

The combination of an optical recording medium and an optical pickup device using an optical head is compared with the combination of a magnetic recording medium such as a magnetic disk and a magnetic pickup device using a magnetic head. This has the advantage that the recording capacity is much larger and the time required for recording information and the time required for reproducing information are short. Further, the recording capacity can be further increased without impairing the advantage of the time required for recording information and the time required for reproducing information in a combination of such an optical recording medium and an optical pickup device using an optical head. It is widely desired to bring

The present invention has been made under the above circumstances, and an object of the present invention is to reduce the time required for recording information and the time required for reproducing information in a combination of an optical recording medium and an optical pickup device using an optical head. An object of the present invention is to provide a double-sided access optical pickup device that can further increase the recording capacity without impairing the advantage of its shortness.

[0005]

In order to achieve the above-mentioned object of the present invention, an optical pickup device for double-sided access according to the present invention comprises: a rotatable optical recording medium which is rotatably disposed near a periphery of a rotating optical recording medium; The base end portion, the rest position extending from the base end portion and located outside the periphery of the optical recording medium with the rotation of the base end portion, and the operating position facing the surface of the optical recording medium. A support pedestal having an extending end moving along a radial direction of the optical recording medium between the support pedestal; and a support pedestal movement for moving the support pedestal in a direction along a rotation center line of the rotating optical recording medium. Means provided on the support pedestal and irradiating a beam light from a light source in both directions along the rotation center line from the extended end of the support pedestal while the extended end of the support pedestal is in the operating position. Recording information on the recording layer of the corresponding optical recording medium It is characterized by comprising; an optical circuit performs at least one of reproducing information from micro the recording layer.

In the double-sided access optical pickup device according to the present invention having the above-mentioned structure, the rotating optical recording media are separated from each other in the direction along the rotation center line of the optical recording media. If a plurality of optical recording media are prepared, the supporting pedestal is provided on a support pedestal that is movable in the direction along the rotation center line of the optical recording medium that is rotated by the support pedestal moving means on both surfaces of the plurality of rotating optical recording media. With the optical circuit provided, the light beam from the light source is emitted while the extended end of the support pedestal is in the operating position with respect to the corresponding optical recording medium among the plurality of optical recording media. At least one of recording of information on the recording layer of the corresponding optical recording medium and reproduction of information from the recording layer by irradiating in both directions along the rotation center line from the extending end of the support base. It is possible to further increase the recording capacity without impairing the advantage of shortening the time required for recording information and the time required for reproducing information in a combination of an optical recording medium and an optical pickup device using an optical head. Can increase.

In the optical pickup device for double-sided access according to the present invention, characterized in that it is constructed as described above, the support pedestal is positioned in a direction along the rotation center line of the rotating optical recording medium. A pair of elastic arm members provided on both sides and extending toward the extended end of the support pedestal, and the extended end of the support pedestal provided at each extended end of the pair of elastic arm members are in the operating position. And a slider that floats from the surface of the optical recording medium near each of the extended ends of the pair of elastic arm members due to wind generated by rotation of the optical recording medium while the optical recording medium is disposed. The optical circuit comprises:
An objective lens that is provided on the pair of sliders and converges the light beam emitted from the light source toward the recording layer of the corresponding optical recording medium via the extended end of the support base to the recording layer of the corresponding optical recording medium. Includes; can.

Such a configuration is similar to a conventional one-sided access optical pickup device and can be easily prepared. In such a configuration,
While a plurality of rotating optical recording media are provided concentrically and in parallel with each other, the support pedestal moving means is located between or at both ends of the plurality of rotating optical recording media. The support pedestal is moved to correspond to the outside of the optical recording medium.

In the optical pickup device for double-sided access according to the present invention having the above-mentioned structure, the extended end of the support base is branched into two in both directions along the rotation center line. And while the extended end of the support pedestal is located in the operative position, it is opposed to both surfaces of the optical recording medium in both directions along the rotation center line;
The optical circuit is configured to transmit the beam light from the light source from the bifurcated extended end of the support pedestal to the rotation center line while the bifurcated extended end of the support pedestal is in the operating position. The optical recording medium may be irradiated in both directions to record information on corresponding recording layers on both sides of the optical recording medium and / or reproduce information from the recording layer.

Such a configuration is similar to a conventional double-sided access optical pickup device and can be easily prepared. More specifically, the support pedestal includes a pair of elastic portions extending toward the extending end of the bifurcated extending end along the mutually facing inner surfaces of the bifurcated extending end. Occurs as the optical recording medium rotates while the arm and the pair of elastic arm members are provided at the respective extending ends and the bifurcated extending ends of the support pedestal are located in the operating position. A slider that floats from both sides of the optical recording medium in the vicinity of the respective extended ends of the pair of elastic arm members; the optical circuit is provided on the pair of sliders and supported by a light source. An objective lens for converging the light beam emitted toward the corresponding recording layers on both sides of the optical recording medium via the bifurcated extending ends of the pedestal to the corresponding recording layers;
I can do it.

In this case, while the plurality of rotating optical recording media are arranged concentrically and in parallel with each other, the support pedestal moving means is provided with a plurality of rotating pedestals. The support base is moved to correspond to any one of the rotating optical recording media.

The optical circuit of the optical pickup device for double-sided access according to the present invention is further provided on a pair of sliders.
The light beam emitted from the light source toward the corresponding recording layers on both sides of the optical recording medium via the extending end of the support base or the bifurcated extending end cooperates with the objective lens. Solid immersion lens (So
lid Immersion Lens) can be included.

An optical circuit using a solid immersion lens is, for example, a CD (Compact Disk) using only an objective lens.
It is known that it has a recording density of about 10 times that of an optical circuit used for a conventional optical recording medium such as a DVD (Digital Video Disk) or a solid immersion lens. An optical circuit using is described in detail in an embodiment of the invention described later.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Various embodiments of the present invention will be described below in detail with reference to the accompanying drawings. First, FIG. 1, FIG. 2, and FIG. A double-sided access optical pickup device according to the first embodiment of the present invention will be described with reference to FIG.

FIG. 1 is a schematic plan view of an optical pickup device for double-sided access according to a first embodiment of the present invention; FIG. FIG. 3 is a side view schematically showing a state where the optical pickup device for double-sided access is used in combination with a plurality of optical disks; and FIG. 3 is an optical path displacement means used in the optical pickup device for double-sided access of FIG. It is a perspective view which expands and shows schematically.

The double-sided access optical pickup device 10 according to the first embodiment of the present invention shown in FIGS. 1 and 2 is a swing arm type, and includes a magneto-optical disk drive, a write-once type disk drive, and It is used in phase change type disk drives and the like to record information on optical recording media such as CD-ROMs, DVDs, and optical cards, and / or
Alternatively, it can hold various optical elements used for reproducing information from the optical recording medium, and record and / or reproduce information on the optical recording medium relative to the optical recording medium. Be moved.

More specifically, the swing arm type double-sided access optical pickup device 10 uses two floating solid immersion lenses known from Japanese Patent Application Laid-Open No. 5-189796. (SIL: So
The recording layers 10 on both sides of the optical disc 100 are further narrowed down through a lid immersion lens.
0a and 100b for selectively recording information and the recording layer 1
It is used to selectively reproduce information based on the reflected light from 00a and 100b. Optical recording / reproducing techniques using such a floating solid immersion lens are known, for example, from “Nikkei Byte”, September 1997, and “Nikkei Electronics”, September 22, 1997. The two floating solid immersion lenses float from both sides of the optical disk 100 by wind generated from the recording layers 100a and 100b formed on both sides of the optical disk 100 as the optical disk 100 rotates, such as a magnetic head of a hard disk. The flying height is between approximately 100 nm and approximately 150 nm. A conventional optical recording / reproducing method in which an optical head is separated from the surface of an optical disk such as a CD or DVD by 1 mm or more is called far field recording, whereas a floating solid immersion lens as described above is used. Optical recording / reproducing method using a near field (Near field)
Field) record. In near-field recording, the light beam used for recording and reproduction can be reduced to approximately 1/10 the thickness of the light beam used for recording and reproduction in far field recording. For this reason, the recording density in the near-field recording is approximately one of the recording density in the far-field recording.
It is possible to make it 0 times.

The support pedestal 11 of the swing arm type double-sided access optical pickup device 10 is made of a lightweight and highly rigid material, for example, a magnesium alloy.
It is formed in an L-shaped planar shape, and has an L-shaped length 2
The outer surface of the intersection of the arms 11a and 11b is arranged near the periphery of the optical disc 100.
It is detachably fixed to the output shaft 12 of the motor. This voice coil motor has the same configuration as a voice coil motor used for operating an arm supporting a magnetic head in a conventional magnetic hard disk drive.

In this embodiment, a plurality of optical disks 100 having the same configuration and the same dimensions are arranged concentrically and in parallel with each other.
Are rotated in the same predetermined direction at the same speed by a disk rotation drive (not shown) having the same configuration as a conventional disk rotation drive using a plurality of magnetic hard disks.

In this embodiment, the housing 99 of the voice coil motor with the output shaft 12 to which the support pedestal 11 of the optical pickup device for double-sided access 10 is fixed is provided by the support pedestal moving means 101. In this embodiment, the support pedestal moving means 101 includes a plurality of guide rods 102 and a feed screw 102 extending in parallel with each other. A member 104 is provided. Here, the feed screw member 104 is connected to a known bidirectional rotary drive source (not shown) such as a bidirectional rotary motor, and the voice coil motor is rotated by rotating the feed screw member 104 one or the other. Is moved in both directions A along the rotation center line of the optical disc 100 together with the support base 11 of the optical pickup device 10 for double-sided access.

The upper surface of the support pedestal 11 is open except for the longer arm 11a. The opening is divided into several chambers by several not-shown partitions each having a not-shown beam passage hole, and some not-shown partitions enhance the rigidity of the support base 11. The rigidity between the long arm 11a and the short arm 11b of the support pedestal 11 is further strengthened by oblique reinforcing rods 11c whose both ends are fixed to the outer surface of the inner wall.

A laser diode 14 used as a light source is supported on an end wall of the shorter arm 11b of the support base 11 in combination with a condenser lens device 16.
The laser diode 14 is operated by a laser oscillation circuit (not shown) stored in a high-frequency shield case (not shown) to emit laser light that is diffused in an elliptical shape into the chamber of the shorter arm 11b of the housing 11, and the condenser lens device 1
Numeral 6 converts the laser light emitted from the laser diode 14 and diffused in an elliptical shape into elliptical parallel light. A prism assembly 18 configured by combining a prism, a plurality of beam splitters, and the like is installed on the inner surface of the bottom wall of the shorter arm 11b of the support pedestal 11.

The elliptical parallel laser light from the condenser lens device 16 incident on the prism assembly 18 is converted into a perfect circular parallel laser beam by the prism of the prism assembly 18 and then branched by the beam splitter of the prism assembly 18. Part of which is the shorter arm 11b
Is guided to a monitor photodetector 20 installed in a beam passage hole (not shown) formed in the outer wall of
The rest is guided to the relay lens device 22 installed on the bottom wall at the base end of the shorter arm 11b. The relay lens device 22 converges the remainder of the perfect circular parallel laser light from the prism assembly 18 toward the galvanometer mirror device 24 installed on the inner surface of the bottom wall at the base end of the longer arm 11a. The galvanomirror device 24 applies the converged laser beam from the relay lens device 22 to a half prism 26 provided on the elongated bottom wall of the longer arm 11a of the support base 11 on the side closer to the extension end than the galvanomirror device 24. Reflects away.

The half prism 26 guides a part of the converged laser light from the galvanomirror device 24 to the monitor photodetector 28 installed on the upper surface of the half prism 26, and extends the rest of the converged laser light to a longer length. It is guided to the imaging lens 30 installed on the bottom end wall of the elongated chamber of the one arm 11a on the extension end side of the half prism 26. The imaging lens 30 shapes the converged laser light again into a perfect circular parallel laser light,
The long arm 11a is guided to an optical path displacing means 32 disposed at an extended end of the bottom wall of the elongated chamber.

The extended end of the longer arm 11 a of the support base 11 is disposed along the surface of the optical disc 100 in a direction substantially orthogonal to the optical path C of the laser light from the galvanomirror device 24 to the optical path displacement means 32. A pair of reflecting mirrors 38, 38 'spaced apart from each other by a predetermined distance are arranged in parallel to the optical path displacing means 32. '

On both sides of the long arm 11a of the support pedestal 11 located in both directions A along the rotation center line of the optical disc 100, extend along the long arm 11a toward the extension end of the long arm 11a. A pair of elongated elastic arm members 34, 3
4 ′, the base end of which is fixed, and a pair of elastic arm members 3
The sliders 36 and 36 'functioning in the same manner as the sliders supporting the magnetic head in the conventional hard disk drive are fixed to the extending ends of the sliders 4 and 34'. Slider 3
The objective lenses 40 and 40 'are provided on the support pedestal facing surface facing the extended end of the longer arm 11a in the sliders 36 and 36'. A solid immersion lens (SIL: Solid Im) is provided on the opposite side of the support base facing the side opposite to the extension end.
and a pair of floating optical heads 44 and 44 '. That is, in this embodiment, the extending end of the longer arm 11a of the support base 11 is disposed substantially symmetrically with respect to the extending end in both directions A along the rotation center line of the optical disc 100. The pair of floating optical heads 44, 44
'Is arranged.

A pair of reflecting mirrors 38 and 38 'at the extended end of the longer arm 11a of the support base 11 emits a perfect circular parallel laser beam selectively incident from the optical path displacing means 32 as described above. The light is reflected in both directions A along the rotation center line of the optical disc 100, and the objective lenses 40, 40 'and the solid immersion lenses 42, 42 of the corresponding pair of floating optical heads 44, 44'.
To ´.

A plurality of optical discs 10 are driven by laser light from a laser diode 14 on a support base 11 of a swing arm type double-sided access optical pickup device 10 shown in FIG.
0 for selectively recording information on any two or one of the recording layers 100a and 100b on both sides of each of the optical discs 100 and / or a plurality of optical discs 100
When selectively reproducing information from any two or one of the recording layers 100a and 100b on both sides of each of the optical recording media 100a and 100b, the optical pickup device 10 for double-sided access uses the support pedestal moving means 101. Is moved in both directions A along the rotation center line of the plurality of optical discs 100, and as shown by the solid line in FIG.
2 between the two optical disks 100 having the desired recording layers 100a and 100b, or as shown by a two-dot chain line in FIG. 2, a desired one of the recording layers 100a and 100b.
The optical disc 100 is disposed outside the optical disc 100 at both ends.

More specifically, information can be selectively recorded on the recording layer 100b on one lower surface or the recording layer 100a on the other upper surface of two adjacent optical disks 100,
Alternatively, in order to selectively reproduce information from these recording layers 100b or 100a, the double-sided access optical pickup device 10 is moved by the support pedestal moving means 101 in both directions A along the rotation center line of the plurality of optical discs 100.
Then, as shown by a solid line in FIG. 2, the optical disk 100 is disposed between two desired adjacent optical disks 100.

While the plurality of optical discs 100 are being rotated at a predetermined number of rotations in a predetermined direction by a known rotary driving device (not shown), the support pedestal 11 rotates around the output shaft 12 of the voice coil motor. Reciprocating in the range of 1) with the extended end of the longer arm 11a, ie, one pair of elastic arm members 34, 34 ', objective lenses 40, 40' and solid immersion lenses 42, 42 '. Pair of sliders 36, 3
6 ′, the recording layer 100b on one lower surface and the recording layer 10 on the other upper surface of two desired adjacent optical discs 100.
The optical disk 100 is moved in the radial direction of the desired two adjacent optical disks 100 along the line 0a as shown by the arrow B in FIG.

In the meantime, the objective lenses 40 and 40 '
The pair of sliders 36, 36 'with the solid immersion lenses 42, 42' is moved in the direction A along the rotation center line of the plurality of optical discs 100 in FIG. 2 by the elasticity of the pair of elastic arm members 34, 34 '. Is freely movable within a predetermined range in the above. For this purpose, a pair of sliders 3 with objective lenses 40, 40 'and solid immersion lenses 42, 42'
6, 36 'are the recording layers 1 on the corresponding lower surface of the desired two optical disks 100 rotating as described above.
00b, the wind generated by one of the two desired optical discs 100 rotating as described above causes the
The two desired optical disks 100 that float within the range of 0 nm and approximately 150 nm and rotate as described above, and rotate as described above with respect to the corresponding recording layer 100a on the other upper surface of the two optical disks 100. Approximately 100 nm and approximately 150 n by the wind generated by the other of the two optical discs 100
m.

When recording information on and / or reproducing information from the recording layer 100b on one lower surface of the desired two optical discs 100, the extension end of the longer arm 11a of the support base 11 is required. Optical path displacement means 32
From the laser diode 14 to the imaging lens 30
The laser beam incident on the optical path displacing means 32 is guided to the reflecting mirror 38 for one of the floating optical heads 44 corresponding to the recording layer 100b on the lower surface through the reflecting mirror 38. The laser beam is directed to the head 44, and the objective lens 40 and the solid immersion lens 42 of the floating optical head 44 converge and irradiate the laser beam to the recording layer 100b on the lower surface of the corresponding one of the optical discs 100. .

The laser beam converged and applied to the recording layer 100b on the lower surface of the corresponding one of the optical discs 100 is reflected by the recording layer 100b and solid immersion lens of the corresponding floating type optical head 44. 42 and the objective lens 40, the corresponding reflecting mirror 38, the optical path displacing means 32, the imaging lens 30, the half prism 26, the galvanometer mirror device 24, and the relay lens device 22 are returned to the prism assembly 18. Relay lens device 22 in beam splitter
A part of the reflected laser light is guided to a servo photodetector 46 installed in a not-shown beam passage hole formed in the inner wall of the shorter arm 11b, and the rest of the reflected laser light is assembled into a prism. Body 18
Through an Oraston prism and an objective lens, and to a magneto-optical signal detecting photodetector 48 installed in a beam passage hole (not shown) formed in the end wall of the shorter arm 11b.

When recording information on the recording layer 100a on the other upper surface of the two desired optical disks 100 and / or reproducing information from the recording layer 100a, the extension of the longer arm 11a of the support base 11 is required. The optical path displacement means 32 at the end is moved from the laser diode 14 to the imaging lens 3.
The laser beam incident on the optical path displacement means 32 through the optical mirror 0 is directed to the reflecting mirror 38 'for the other floating optical head 44' corresponding to the recording layer 100a on the upper surface, and the reflecting mirror 38
′ Directs the laser beam to the other corresponding floating optical head 44 ′, and the objective lens 40 ′ and the solid immersion lens 42 ′ of the floating optical head 44 ′ correspond to the recording layer on the upper surface of the corresponding other optical disc 100. The laser light is converged and irradiated to 100a.

The laser light converged and applied to the recording layer 100a on the upper surface of the other optical disk 100 is reflected by the recording layer 100a and solid immersion of the corresponding other floating optical head 44 '. Lens 42 'and objective lens 40', corresponding reflecting mirror 38 ', optical path displacement means 32, imaging lens 30, half prism 26,
The beam is returned to the prism assembly 18 via the galvanometer mirror device 24 and the relay lens device 22, and a part of the reflected laser light from the relay lens device 22 is formed on the inner wall of the shorter arm 11b in the beam splitter of the prism assembly 18. The laser beam is guided to a servo photodetector 46 installed in a beam passage hole (not shown), and the rest of the reflected laser light is passed through an oraston prism and an objective lens of a prism assembly 18 to the end of the shorter arm 11b. The light is guided to a photodetector 48 for detecting a magneto-optical signal, which is provided in a beam passage hole (not shown) formed in the wall.

The outer end surface of the optical disk 100 located at both ends of the plurality of optical disks 100, the upper end surface of the optical disk 100 located at the upper end in FIG. 2, and the lower end surface of the optical disk 100 located at the lower end. , Or information is selectively recorded on the recording layer 100a or 100b of the recording layer 100a or 100b.
Alternatively, in order to selectively reproduce information from the optical disc 100b, the double-sided access optical pickup device 10 is moved in both directions A along the rotation center lines of the plurality of optical discs 100 by the support pedestal moving means 101, and a desired It is arranged outside the optical disc 100 at the outer end. In FIG. 2,
The double-sided access optical pickup device 10 disposed below and below the lower end optical disk 100 is indicated by a two-dot chain line.

While the plurality of optical discs 100 are being rotated in a predetermined direction at a predetermined number of revolutions by a known rotary driving device (not shown), the support pedestal 11 rotates around the output shaft 12 of the voice coil motor by a predetermined amount. Reciprocating in the range of 1) with the extended end of the longer arm 11a, ie, one pair of elastic arm members 34, 34 ', objective lenses 40, 40' and solid immersion lenses 42, 42 '. Pair of sliders 36, 3
6 'is moved along the outer recording layer 100a or 100b of the desired outer end optical disc 100 in the radial direction of the desired two adjacent optical discs 100 as shown by arrow B in FIG.

In the meantime, the objective lenses 40 and 40 '
The pair of sliders 36, 36 'with the solid immersion lenses 42, 42' is moved in the direction A along the rotation center line of the plurality of optical discs 100 in FIG. 2 by the elasticity of the pair of elastic arm members 34, 34 '. Is freely movable within a predetermined range. Therefore, the desired outer end optical disc 100
A pair of the slider 36 or the objective lens 40 'with the objective lens 40 and the solid immersion lens 42 corresponding to the outer recording layer 100a or 100b and the solid immersion lens 4
A pair of sliders 36 'with 2' (the recording layer 100b outside the lower end optical disc 100 in the example of the two-dot chain line in FIG. 2)
A pair of sliders 36) having an objective lens 40 and a solid immersion lens 42 corresponding to the recording layer 100 outside the desired outer end optical disc 100 rotating as described above.
a or 100b (in the example of the two-dot chain line in FIG. 2, the recording layer 100b on the outer side of the lower end optical disk 100), the wind generated by the desired outer end optical disk 100 rotating as described above winds up to about 100 nm and about 150 nm. And rise within the range.

Information recording and / or recording on the outer recording layer 100a or 100b of the desired outer end optical disc 100 is performed.
Alternatively, when reproducing information from the recording layer 100a or 100b outside the optical disc 100 at the desired outer end, the optical path displacement means 32 at the extended end of the longer arm 11a of the support base 11 is connected to the laser diode 14 by the laser diode 14. The reflecting mirror 3 for the floating optical head 44 or 44 'corresponding to the desired outer recording layer 100a or 100b is applied to the laser beam incident on the optical path displacement means 32 via the imaging lens 30.
8 or 38 '(in the example of the two-dot chain line in FIG. 2, the reflecting mirror 38 for the floating optical head 44 corresponding to the recording layer 100b outside the lower end optical disc 100). The laser beam is directed to the corresponding floating optical head 44 or 44 ′, and the objective lens 40 and the solid immersion lens 42 of the floating optical head 44 or the objective lens 40 ′ and the solid immersion lens of the floating optical head 44 ′. 42 ′ (in the example of the two-dot chain line in FIG. 2, the objective lens 40 and the solid immersion lens 42 of the floating optical head 44) correspond to the recording layer 1 outside the corresponding desired outer end of the optical disc 100.
00a or 100b (in the example of the two-dot chain line in FIG. 2, the lower recording layer 100b outside the lower optical disc 100)
Is converged and irradiated with the laser light.

The laser light converging and radiating on the outer recording layer 100a or 100b of the desired outer end optical disk 100 is reflected by the recording layer 100a or 100b and solidified in the corresponding floating optical head 44. The immersion lens 42 and the objective lens 40 or the solid immersion lens 42 ′ and the objective lens 40 ′ of the floating optical head 44 ′,
Corresponding reflecting mirror 38 or 38 ', optical path displacement means 32,
The beam is returned to the prism assembly 18 via the imaging lens 30, the half prism 26, the galvanometer mirror device 24, and the relay lens device 22.
A part of the reflected laser light from the laser beam 2 is guided to a servo photodetector 46 installed in a beam passage hole (not shown) formed in the inner wall of the shorter arm 11b, and the rest of the reflected laser light is Assembly 18
Through an Oraston prism and an objective lens, and to a magneto-optical signal detecting photodetector 48 installed in a beam passage hole (not shown) formed in the end wall of the shorter arm 11b.

The recording layer 100a or 100b of the two desired optical disks 100 adjacent to each other by the laser beam from the laser diode 14 of the support base 11 of the swing arm type double-sided access optical pickup 10 of FIG. One optical disk 10 at the desired outer end
0 when no information is recorded on the outer recording layer 100a or 100b, and when the recording layers 100 of the two desired optical disks 100 adjacent to each other are opposed to each other.
When information is not reproduced from the outer recording layer 100a or 100b of the optical disc 100 at the desired outer end, the support pedestal 11 of the swing arm type double-sided access optical pickup 10 is provided with the voice coil. Longer arm 1 due to motor output shaft 12
1a, that is, a pair of elastic arm members 34, 34 ', objective lenses 40, 40', and solid immersion lenses 42, 42.
The floating optical heads 44 and 44 'including the sliders 36 and 36' with the recording layer 100a or 100b of the two desired optical disks 100 facing each other or the recording layer outside the optical disk 100 at the desired outer end. The optical disc 100 is moved from a position facing 100a or 100b to a rest position in the radial direction of the optical disc 100 beyond the periphery of the two desired optical discs 100 or one of the desired outer end optical discs 100.

A housing 99 of a voice coil motor (not shown) having an output shaft 12 for the above-mentioned rotation of the support base 11 of the swing arm type double-sided access optical pickup 10 is provided with a conventional motor (not shown). In the magnetic hard disk drive, a support spring receiver (not shown) having the same configuration as a known support spring receiver (not shown) for receiving a support spring of an arm supporting a magnetic head is provided, and a pair of elastic arm members is provided at the rest position as described above. 34, 34 '
Is the first end of the plurality of optical discs 100 extending in the direction A along the rotation center line by the support spring receiver (not shown).
The distance between the pair of floating optical heads 44 and 44 ′ is kept smaller than the distance between two adjacent ones of the plurality of optical discs 100.

In this embodiment, the support pedestal 11
A laser oscillation circuit (not shown), a photodetector 48 for detecting a magneto-optical signal, a photodetector 20 for monitoring, a photodetector 46 for servo, and a photodetector 46 for servo mounted on the end wall, the outer wall, and the inner wall of the shorter arm 11b. A galvanomirror device 24 at the base end of the bottom wall of the longer arm 11a of the eleventh arm 11a;
The electric circuit for operation of the monitor photodetector 28 on the bottom wall of a is formed on the flexible substrate 50, and the flexible substrate 50 prevents disconnection in the electric circuit, particularly disconnection of an IC chip included in the electric circuit. Therefore, it is fixed on the support bar 11c of the support base 11 while being fixed on the reinforcing plate.

FIG. 3 is a perspective view showing a schematic configuration of the optical path displacement means 32 used in this embodiment. In this embodiment, the optical path displacing means 32 converts the laser light from the laser diode 14 as a light source installed on the short arm 11 b of the support base 11 of the swing arm type double-sided access optical pickup 10 into an imaging lens 30. When the light enters the optical path displacing means 32 through the optical path displacing means 32, the optical discs 100 are transferred from the optical path displacing means 32 via the two reflecting mirrors 38 and 38 'at the extended end of the longer arm 11a of the support base 11. In the direction along the rotation center line A, two branch optical paths C ′ and C ″ (see FIG. 3) leading to a pair of floating optical heads 44 and 44 ′ corresponding to the two reflecting mirrors 38 and 38 ′, respectively. 1) (i.e., the optical path length) are set to be equal, and these two branched optical paths C
The optical characteristics of the laser light in each of ′ and C ″ can be set to be equal.

In this embodiment, the optical path displacement means 32
The device selectively guides the laser beam incident on the optical path displacement unit 32 to one of the two branch optical paths C and C ′ by using a prism refraction function. More specifically, as shown in FIG. 3, the optical path displacing means 32 of this embodiment comprises a support base 11 of a swing arm type double-sided access optical pickup 10.
32 installed at the extension end of the longer arm 11a
a parallel plate 32 capable of turning within a predetermined range in the horizontal direction
b. In this embodiment, the parallel flat plate 32b
Is a torsionally elastic member 32 such as a piano wire extending in a direction along the rotation center line A of the plurality of optical discs 100.
c is supported by the horizontal beam at the upper end of the frame 32a, but the frame 32 is also supported by a leaf spring (not shown) extending vertically in the vertical column of the frame 32a.
a can be supported so as to be pivotable within a predetermined range in the horizontal direction.

The parallel flat plate 32b of the optical path displacement means 32 from the laser diode 14 as a light source installed on the short arm 11b of the support base 11 of the optical pickup 10 for double-sided access via the imaging lens 30. The laser light incident on the two branch optical paths C
′ And C ″, a predetermined angle α, α is set on both sides in the horizontal direction with respect to the optical path of the incident laser light (a dashed line indicated by reference numeral C in FIG. 3). ´
Only by the selective driving means.

In this embodiment, the selection driving means comprises:
A substantially fan-shaped coil 32d installed on the lower surface of the parallel plate 32b with the rotation center line of the parallel plate 32b substantially as a center, and a parallel plate 32b and a substantially fan-shaped coil 32d below the lower surface of the parallel plate 32b. A pair of magnets 32e, 32 'arranged along the optical path C of the incident laser light
e. And a pair of magnets 32e, 32 '
In each of e, the magnetic poles facing the coil 32d are different from each other.

In the selective driving means constructed as described above, the parallel plate 32b can be selectively inclined as described above by changing the direction of the current flowing through the coil 32d. FIG. 4 schematically shows the function of the parallel flat plate 32b. The optical path C of the laser beam incident on the inclined parallel flat plate 32b has an inclination angle α,
The length l of the parallel plate 32b in the direction along the optical path C,
Then, it is moved in parallel in the horizontal direction by a distance d from the optical path C according to the refractive index n of the parallel flat plate 32b, and the two reflecting mirrors 38,
The light is emitted from the parallel flat plate 32b along one of the two branch light paths C 'and C''corresponding to 38'.

Here, the laser beam incident on the parallel plate 32b of the optical path displacement means 32 is converted into the recording layer 10 of the optical disk 100 by utilizing the prism refraction of the parallel plate 32b.
The light is selectively guided to one of the two branch optical paths C ′ and C ″ parallel to 0a or 100b, and the two branch optical paths C ′ and C ″ have the same optical path length. Therefore, there is no difference in the optical characteristics, such as aberration, of the laser light passing through the two branch optical paths C ′, C ″.

Also, regardless of the inclination angle α of the parallel plate 32b, the inclination of the light beam such as a laser beam emitted from the parallel plate 32b with respect to the light beam such as a laser beam incident on the parallel plate 32b is constant. Therefore, the error of the inclination angle α of the parallel plate 32b is caused by the two branch optical paths C ′ and C with respect to the optical path C of the laser beam incident on the parallel plate 32b.
A pair of floating optical heads 4 corresponding to the two reflecting mirrors 38 and 38 'from the parallel plate 32b without causing the tilt of ""
No change occurs in the optical characteristics up to each of 4,44 '.

As a result, the accuracy of information recorded on the corresponding recording layer 100a or 100b of the corresponding optical disc 100 by the pair of floating optical heads 44 and 44 'of the double-sided access optical pickup 10, and the accuracy of these information The possibility of causing a difference in the accuracy of the information reproduced from the recording layer 100a or 100b is reduced.
), A DVD (Digital Video Disk), and the like, compared with a conventional floating type optical head used for recording information and reproducing information from these, the objective lens 40, 40 'and the solid immersion lens 42, 42' As described above, it is possible to record information at a much higher density of about 10 times by using a pair of floating optical heads 44 and 44 'utilizing the combination. In the above-described near-field recording in which the optical pickup device 10 for double-sided reproduction according to the above is used.

Further, an optical pickup device 1 for double-sided access
0 is moved in a direction perpendicular to the recording layers 100a and 100b of the optical disc 100, whereby the relative height position with respect to the plurality of optical discs 100 is changed. The recording layers 100a and 100b can be accessed if only one double-sided optical pickup device 10 is used. Therefore, the double-sided access light for the plural recording layers 100a and 100b of the plural optical discs 100 can be accessed. The configuration of the pickup device 10 can be simple and inexpensive.

Further, one laser beam from one laser diode 14 is applied to the two recording layers 100 a and 100 b of the optical disc 100 by using one optical path displacement unit 32.
To the recording layer 100
The configuration of the optical circuit of the optical pickup device 10 for double-sided access for a and 100b can be made simple and inexpensive.

[Second Embodiment] FIG. 5 is a schematic side view of a main part of a double-sided access optical pickup device according to a second embodiment of the present invention; and FIG.
FIG. 6 is a side view schematically showing a state in which the optical pickup device for double-sided access according to the second embodiment of FIG. 5 is used in combination with a plurality of optical disks.

The difference between the second embodiment and the first embodiment described above with reference to FIGS. 1 to 3 is that the longer side of the support base 11 of the optical pickup device 10 for double-sided access is used. The structure of the extended end of the arm 11a and a pair of floating optical heads 44,
44 '.

In the second embodiment, the support base 1
The extended end of one longer arm 11a is bifurcated in the direction A along the rotation center line of the optical disk 11. The longer arm 11a of the support pedestal 11 has two extended portions 60a, 60b extending along the inner surfaces of the two extended portions, which are bifurcated, facing each other. The base ends of a pair of elastic arm members 62a, 62b extending toward the ends are fixed.

The floating optical head 4 of the first embodiment described above is attached to the extending ends of the pair of elastic arm members 62a and 62b.
Floating optical heads 44, 44 'having the same configuration as the optical heads 4, 44' have the respective solid immersion lenses 42, 42 'facing each other and the respective objective lenses 40, 40' in opposite directions to each other. It is supported in the state where it turned. As a result,
The objective lenses 40, 40 'of the pair of floating optical heads 44, 44' at the extended ends of the pair of elastic arm members 62a, 62b are:
The extension ends of the inner surfaces of the two branch portions 60a and 60b of the extension end of the longer arm 11a of the support base 11 that face each other face each other. That is, one optical disc 100
The floating optical head 44 supported by a pair of elastic arm members 62a, 62b of two branch portions 60a, 60b sandwiching the
44 ′ is the recording layer 10 on both sides of one optical disc 100
0a and 100b.

In this embodiment, a laser beam from a laser diode 14 as a light source of a shorter arm 11b of the support base 11 shown in FIG. Long arm 11a
The optical path displacing means 32 'at the extension end of the
The optical path E of the laser beam incident on the optical disc 11 is selectively distributed to one of the two branch optical paths translated in the direction A along the rotation center line of the optical disc 11, and the longer arm 11a of the support base 11 is Optical path displacement means 32 'at the extension end
It is guided to a prism 64 which is arranged closer to the extension end of the longer arm 11a. The prism 64 further divides the laser light selectively divided into two from the optical path displacing means 32 ′ into a pair of reflecting mirrors 6 located on both sides of the prism 64 in the direction A along the rotation center line of the optical disk 11.
6, 66 ′, and a pair of reflecting mirrors 6
6, 66 'is further selectively provided to one of the pair of reflecting mirrors 68, 68' at the extending ends of the two branch portions 60a, 60b at the extending end of the longer arm 11a of the support base 11. The other pair of reflecting mirrors 68, 68 '
In the direction A along the rotation center line 1, the light is selectively guided to any one of the objective lenses 40, 40 'and the solid immersion lenses 42, 42' of the floating optical heads 44, 44 '.

In the second embodiment, a plurality of laser beams from a laser diode 14 as a light source of a support base 11 of a swing arm type double-sided access optical pickup device 10 shown in FIG. The recording layers 100a, 1 on both sides of the optical disc 100
00b, and / or recording layers 100a, 1 on both surfaces of each of the plurality of optical discs 100.
When the information is selectively reproduced from the pedestal moving means 1b, the double-sided access optical pickup device 10 is used as shown in FIG.
01, the optical disc 100 is moved in both directions A along the rotation center line of the plurality of optical discs 100, and as shown by a solid line in FIG.
00 is arranged.

While the plurality of optical discs 100 are being rotated at a predetermined number of rotations in a predetermined direction by a known rotary driving device (not shown), the support pedestal 11 is the same voice coil as that shown in FIG. An extended end of the longer arm 11a reciprocated in a predetermined range around the output shaft 12 of the motor, ie, a pair of elastic arm members 34, 34 ', objective lenses 40, 40', and a solid liquid A pair of sliders 36, 36 ′ with immersion lenses 42, 42 ′ is arranged along the recording layers 100 a, 100 b on both sides of a desired optical disc 100, as shown by an arrow B in FIG. One optical disc 100 is moved in the radial direction.

In the meantime, the objective lenses 40 and 40 '
The pair of sliders 36, 36 'with the solid immersion lenses 42, 42' is moved in the direction A along the rotation center line of the plurality of optical discs 100 in FIG. 6 by the elasticity of the pair of elastic arm members 34, 34 '. Can be freely moved up and down within a predetermined range. To this end, a pair of sliders 36, 36 'with the objective lenses 40, 40' and the solid immersion lenses 42, 42 'are rotated to the desired one, as described above.
Recording layers 100a, 100 on both sides of one optical disc 100
As described above, the desired one optical disc 100 rotating as described above floats in the range of about 100 nm and about 150 nm due to the wind generated by the wind. When recording information on the recording layer 100a on the upper surface of the desired one optical disc 100 and / or reproducing information from the recording layer 100a, the optical path displacing means of the extended end of the longer arm 11a of the support base 11 is used. 32 ′, the laser beam incident on the optical path displacement means 32 ′ from the laser diode 14 via the prism assembly 18 via the prism 64 and the recording layer 1 on the upper surface
00a is directed to the two reflecting mirrors 66 and 68 in the upper branch portion 60a for the upper floating optical head 44 corresponding to 00a.

The two reflecting mirrors 6 in the upper branch portion 60a
6, 68 directs the laser beam to the corresponding upper floating optical head 44, and the objective lens 40 and the solid immersion lens 42 of the floating optical head 44 record the corresponding upper surface of one desired optical disc 100. The laser light is converged and applied to the layer 100a.

The laser beam converged and applied to the recording layer 100a on the upper surface of the desired one optical disc 100 is reflected from the recording layer 100a and solid immersion of the corresponding upper floating optical head 44 above. The lens 42 and the objective lens 40, the two reflecting mirrors 66, 68, the prism 64, and the optical path displacing means 32 in the corresponding upper branch portion 60a, the imaging lens 30, the half prism 26, and the galvanometer shown in FIG. The laser beam is returned to the prism assembly 18 via the mirror device 24 and the relay lens device 22, and a part of the reflected laser light from the relay lens device 22 is formed on the inner wall of the shorter arm 11b in the beam splitter of the prism assembly 18. To a servo photodetector 46 installed in a beam passage hole (not shown) The remainder of the reflected laser light is passed through an oraston prism and an objective lens of the prism assembly 18 and a photodetector for detecting a magneto-optical signal installed in a beam passage hole (not shown) formed in the end wall of the shorter arm 11b. Lead to 48.

When recording information on the recording layer 100b on the lower surface of the desired one optical disc 100 and / or reproducing information from the recording layer 100b, the support base 1
Optical path displacing means 32 'at the extended end of the longer arm 11a
From the laser diode 14 to the prism assembly 18
The laser beam incident on the optical path displacing means 32 'through the prism 64 is divided into a lower branch portion 60 for the lower floating optical head 44' corresponding to the lower recording layer 100b.
b) to the two reflecting mirrors 66 'and 68'.

The two reflecting mirrors 6 in the lower branch portion 60b
6 ', 68' are corresponding lower floating optical heads 44 '.
The objective lens 40 ′ and the solid immersion lens 42 ′ of the floating optical head 44 ′ are set to a desired one.
Recording layer 100b on the corresponding lower surface of one optical disc 100
Is converged and irradiated with the laser light.

The laser beam converged and applied to the recording layer 100b on the lower surface of the desired one optical disc 100 is reflected from the recording layer 100b and solid-state liquid of the corresponding lower floating optical head 44 '. The immersion lens 42 'and the objective lens 40', the two reflecting mirrors 66 'and 68' in the corresponding lower branch portion 60b, the prism 64, and the optical path displacement means 3
2. The following is the imaging lens 3 shown in FIG.
0, the half prism 26, the galvanomirror device 24, and the relay lens device 22 to return to the prism assembly 18. In the beam splitter of the prism assembly 18, a part of the reflected laser light from the relay lens device 22 is transferred to the shorter arm. 11b is guided to a servo photodetector 46 installed in a beam passage hole (not shown) formed in the inner wall of the inner wall of the prism assembly 11b. The arm 11b is guided to a photodetector 48 for detecting a magneto-optical signal, which is installed in a beam passage hole (not shown) formed in the end wall of the arm 11b.

A swing arm type double-sided access optical pickup 1 according to the second embodiment shown in FIGS.
When information is not recorded on the recording layers 100a and 100b on both sides of the desired one optical disc 100 by the laser beam from the laser diode 14 of the support pedestal 11 through the prism assembly 18, and Recording layers 100a, 100b on both sides of one optical disc 100
When information is not reproduced from the head, the support base 11 of the swing arm type double-sided access optical pickup 10 is provided with a longer arm 11a by the output shaft 12 of the voice coil motor similar to that shown in FIG. Extension end, ie 1
A pair of elastic arm members 34, 34 'and objective lenses 40, 40
And slider 3 with solid immersion lenses 42, 42 '
The floating optical heads 44 and 44 'including the recording layers 100a and
The optical disk 100 is moved from the operating position facing the optical disk 100b to a rest position outside in the radial direction of the desired optical disk 100.

An output shaft 12 having the same structure as that shown in FIG. 1 for rotating the support base 11 of the swing arm type double-sided access optical pickup 10 according to the second embodiment is shown in FIG. The housing 99 of the voice coil motor (not shown) has a support (not shown) having the same configuration as a well-known support spring (not shown) for receiving a support spring of an arm supporting a magnetic head in a conventional magnetic hard disk drive (not shown). A spring receiver is provided and a pair of elastic arm members 34, 34 in the rest position as described above.
The distance between the pair of floating optical heads 44 and 44 ′ in the direction A along the rotation center line of the plurality of optical disks 100 is determined by the support spring receiver (not shown). The state is set to be larger than the distance between 100a and 100b.

The configuration of the optical path displacement means 32 'used in this embodiment is basically the same as the configuration of the optical path displacement means 32 shown in FIGS. 1 and 3 of the first embodiment. The support base 1 of the swing arm type double-sided access optical pickup 10 according to the second embodiment is the same.
1 from a laser diode 14 as a light source installed on the short arm 11b shown in FIG. 1 via a prism assembly 18 to a light path displacing means 32 'shown in FIG. The light is transmitted from the optical path displacing means 32 'to the two reflecting mirrors 66, 68 and 66 in the prism 64 at the extended end of the longer arm 11a of the support pedestal 11 and the bifurcated portions 60a and 60b, respectively. ′, 68 ′, corresponding to the two reflecting mirrors 66, 68 and 66 ′, 68 ′ in each of the forked branch portions 60 a, 60 b in the direction along the rotation center line A of the plurality of optical discs 100. 2 to reach each of the pair of floating optical heads 44 and 44 '.
The lengths (that is, the optical path lengths) of the two branch optical paths D and D ′ (see FIG. 4) can be set equal, and the optical characteristics of the laser light in each of the two branch optical paths D and D ′ can be set equal. It is configured as follows.

The optical path displacement means 32 'of this embodiment is
Compared to the optical path displacement means 32 of the first embodiment shown in FIGS. 1 and 3, the direction in which the rotation center line of the parallel plate 32b extends extends along the rotation center lines of the plurality of optical discs 100. The only difference is that the direction is changed from the direction A to the direction substantially orthogonal to the direction A and substantially parallel to both surfaces of the plurality of optical discs 100.

The optical path displacement means 32 of this embodiment
′ Also uses the prism refraction function to change the optical path E of the laser light incident on the optical path displacement means 32 ′, similarly to the optical path displacement means 32 shown in FIGS. 1 and 3 of the first embodiment. The two branch optical paths D parallel to the optical path E,
The light is selectively guided to any one of D ′ via the prism 64.

Therefore, the optical path displacement means 32 of this embodiment
The parallel plate (not shown) is displaced through a prism assembly 18 from a laser diode 14 as a light source installed on a shorter arm 11b of a support base 11 of the optical pickup 10 for double-sided access according to this embodiment. The optical path E of the laser beam incident on the parallel plate (not shown) of the means 32 ′ is directed in the direction A along the rotation center line of the optical disc 100 (that is, the recording layers 100 a and 100 on both surfaces of the optical disc 100).
(a direction perpendicular to b).
To the optical path E of the incident laser light so as to be selectively guided to any one of the two branch optical paths D and D ′ via the optical disk 100 on both sides in the direction A along the rotation center line of the optical disk 100. By the selection driving means. This selection driving means can be the same as the structure described with reference to FIG. 3 as the selection driving means for the optical path displacement means 32 of the first embodiment described above, but is not limited to the second embodiment. It is possible to employ a selection drive unit having another known appropriate structure as the selection drive unit for the optical path displacement unit 32 ′ of the embodiment and the selection drive unit for the optical path displacement unit 32 of the first embodiment described above. It goes without saying that you can do it.

Here, the optical path displacing means 32 'is utilized by utilizing the parallel plate prism refracting action of the optical path displacing means 32'.
Is selectively guided to one of the two branch optical paths D and D 'via the prism 64, but the two branch optical paths D and D' have the same optical path length. As a result, there is no difference in the optical characteristics, such as aberration, of the laser light passing through the two branch optical paths D, D '.

As a result, a pair of floating optical heads 4 of the optical pickup 10 for double-sided access according to this embodiment is provided.
4, 44 ', the accuracy of information recorded on the recording layers 100a, 100b on both sides of the desired one optical disc 100 and the accuracy of information reproduced from these recording layers 100a, 100b are different. And the importance of such an effect is the so-called CD (Com
pact Disk), DVD (Digital Video Disk), etc., compared to the conventional floating type optical head used for recording information and reproducing information from them.
As described above, it is possible to record information at a much higher density of about 10 times by using a pair of floating optical heads 44, 44 'utilizing a combination of the solid immersion lenses 42, 42'. It is possible to increase the size in the above-described near-field recording in which the optical pickup device 10 for double-sided reproduction according to the above-described second embodiment of the present invention is used.

In the two embodiments described above, the support pedestal moving means 101 includes the guide rod 102 and the feed screw member 1.
Although the configuration is made in combination with the configuration 04, it is needless to say that other known appropriate configurations such as a pantograph mechanism can be adopted.

In the above two embodiments, the laser light from the laser diode 14 as a light source is provided on the support pedestal 11 while the extended end of the support pedestal 11 is in the operating position. The recording layer 100 of the corresponding optical disc 100 is irradiated by irradiating in both directions A along the rotation center line of the plurality of optical discs 100 from the extended end of the support base 11.
Recording of information on a or 100b and the recording layer 1
The optical circuit that performs at least one of the reproduction of information from 00a and 100b is: In the first embodiment of the present invention described above with reference to FIGS.
Condenser lens device 1 following laser diode 14
6, prism assembly 18, monitor photodetector 20, relay lens device 22, galvanomirror device 2
4, half prism 26, monitor photodetector 2
8, an imaging lens 30, an optical path displacement means 32, a pair of reflecting mirrors 38, 38 ', a pair of floating optical heads 44,
44 ', a servo photodetector 46, and a magneto-optical signal detection photodetector 48; or, in the second embodiment of the present invention described above with reference to FIGS. 5 and 6, the condenser lens device 16 following the laser diode 14. , Prism assembly 18, monitor photodetector 20, relay lens device 22, galvanometer mirror device 24, half prism 26, monitor photodetector 28, imaging lens 30, optical path displacing means 32, prism 64, pair of reflecting mirrors 66, 66 '. , Another pair of reflecting mirrors 68, 68 ′, one pair of floating optical heads 4
4 and 44 ', a servo photodetector 46, and a magneto-optical signal detection photodetector 48, but any other known optical optics can be used as long as it can function as the optical circuit described above. It goes without saying that a circuit can be adopted.

[0077]

As is clear from the above description,
ADVANTAGE OF THE INVENTION According to the optical pickup device for double-sided access according to this invention, in the combination of an optical recording medium and an optical pickup device using an optical head, the advantage that the time required for recording information and the time required for reproducing information are short. The recording capacity can be further increased without impairing the recording capacity.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of an optical pickup device for double-sided access according to a first embodiment of the present invention.

FIG. 2 is a side view schematically showing a state where the double-sided access optical pickup device of FIG. 1 is used in combination with a plurality of optical disks.

FIG. 3 is an enlarged perspective view schematically showing an optical path displacement unit used in the optical pickup device for double-sided access in FIG. 1;

FIG. 4 is a view schematically showing a function of a parallel plate of the optical path displacement unit of FIG. 3;

FIG. 5 is an enlarged schematic side view of the optical pickup device for double-sided access according to the first embodiment of the present invention.

6 is a side view schematically showing a state in which the optical pickup device for double-sided access of FIG. 5 is used in combination with a plurality of optical disks.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Support base 14 Laser diode (light source) 16 Condenser lens device (optical circuit) 18 Prism assembly (optical circuit) 20 Monitor photodetector (optical circuit) 22 Relay lens device (optical circuit) 24 Galva mirror device (optical circuit) 26 half Prism (optical circuit) 28 Photodetector for monitoring (optical circuit) 30 Image lens device (optical circuit) 32 Optical path displacement means (optical circuit) 34, 34 'Elastic arm member 36, 36' Slider 38, 38 'Reflecting mirror (optical circuit) ) 40,40 'Objective lens (optical circuit) 42,427 Solid immersion lens 44,44' Floating optical head (optical circuit) 46 Photodetector for servo (optical circuit) 48 Photodetector for detecting magneto-optical signal (optical circuit) 60a , 60b Branch portions 62a, 62b Sex arm member 64 Prism (optical circuit) 66, 66 'Reflector (optical circuit) 68, 68' Reflector (optical circuit) 100 Optical disk (optical recording medium) 100a, 100b Recording layer 101 Support pedestal moving means A Bi-directional C, C 'branch optical path D, D' branch optical path along rotation center line of optical disk

Claims (6)

[Claims] 1. A base end portion rotatably disposed near the periphery of a rotating optical recording medium, and extending from the base end to the outside of the periphery of the optical recording medium with the rotation of the base end. A support pedestal having an extended end that moves along a radial direction of the optical recording medium between a rest position positioned toward the other and an operating position facing the surface of the optical recording medium; A support pedestal moving means for moving the support pedestal in a direction along the rotation center line of the optical recording medium; provided on the support pedestal, a light source from the light source while the extended end of the support pedestal is in the operating position. At least one of recording information on the recording layer of the corresponding optical recording medium and reproducing information from the recording layer by irradiating the beam light in both directions along the rotation center line from the extending end of the support base. A double-sided access circuit, comprising: Optical pickup device. 2. A pair of elastic arm members provided on both sides of the support pedestal in a direction along the rotation center line of the rotating optical recording medium and extending toward the extended end of the support pedestal. And a pair of elastic arms provided by the wind generated by the rotation of the optical recording medium while the extending end of the support pedestal is provided at the extending end of each of the pair of elastic arm members while the extending end of the support pedestal is in the operating position. A slider floating from a surface of the optical recording medium proximate each of the extending ends of the arm members; the optical circuit being provided on the pair of sliders to extend an extending end of the support base from a light source. 2. The double-sided lens according to claim 1, further comprising an objective lens that converges the light beam emitted toward the recording layer of the corresponding optical recording medium through the corresponding recording layer of the optical recording medium. Optical pickup device for access. 3. The rotating optical recording medium is a plurality of optical recording media arranged concentrically and in parallel with each other, and the supporting pedestal moving means is located between or at both ends of the plurality of rotating optical recording media. 3. The optical pickup device for double-sided access according to claim 1, wherein the support pedestal is moved so as to correspond to the outside of the optical recording medium. 4. An extended end of the support pedestal is bifurcated in both directions along the rotation center line, and the rotation center is extended while the extended end of the support pedestal is located in the operating position. Opposing both sides of the optical recording medium in both directions along the line, wherein the optical circuit emits a beam of light from the light source while the bifurcated extending end of the support pedestal is located in the operating position. Irradiation is performed in both directions along the rotation center line from the bifurcated extending end of the support base to record information on the corresponding recording layers on both sides of the optical recording medium and to reproduce information from the recording layers. The optical pickup device for double-sided access according to claim 1, wherein one of the two operations is performed. 5. A pair of elastic arms extending toward the extension end of the bifurcated extension end along the mutually facing inner surfaces of the bifurcation extension end. Generated by the rotation of the optical recording medium while the bifurcated bifurcated extending end of the support pedestal provided at the extending end of each of the pair of elastic arm members is disposed in the operating position. A slider floating from both sides of the optical recording medium near the respective extended ends of the pair of elastic arm members by wind; said optical circuit being provided on the pair of sliders and receiving light from a light source by a support base. And an objective lens for converging the light beam emitted toward the corresponding recording layers on both sides of the optical recording medium via the bifurcated extended end portion to the corresponding recording layer. The optical pickup device for double-sided access according to claim 4. 6. The rotating optical recording medium is a plurality of optical recording media arranged concentrically and in parallel with each other, and the support pedestal moving means corresponds to any one of the plurality of rotating optical recording media. The support pedestal is moved so that:
The optical pickup device for double-sided access according to any one of the above.