JP2001068779A - Optical integrated element, optical pickup and optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure of a device by providing the device with a light-receiving element for receiving rays of return light corresponding respectively to laser beam having different wavelengths. SOLUTION: One of the regions AR1 on the sides of semiconductor laser diode chips 15A and 15B sends a return ray of 0th-order diffracted light by a diffraction grating 19B toward regions of light-receiving surfaces A and B, and the remaining return rays of -1st and +1st order diffracted lights toward regions of light-receiving surfaces E and F which are closer to semiconductor laser diode chips 15A and 15B. Further, an area AR2 similarly sends the return ray of the 0th-order diffracted light toward the continuous light-receiving surface C, and the remaining return rays of the -1st and +1st order diffracted lights toward the light-receiving surfaces E and F. The remaining area AR3, which is distant from the chips 15A and 15B, sends the return ray of the 0th-order diffracted light to light-receiving surfaces L and M, and the remaining return rays of the -1st and +1st order diffracted lights toward regions of the surfaces E and F which are distant from the chips 15A and 15B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical integrated device, an optical pickup, and an optical disk device, and can be applied to, for example, an optical disk device for reproducing a compact disk and a DVD (Digital Video Disk). The present invention
When the return light is decomposed by the diffraction grating and received by the light receiving element, a plurality of laser light sources having different wavelengths are arranged at a predetermined distance from each other so as to compensate for the difference in the diffraction angle due to the diffraction grating. To be able to access various types of optical disks.

[0002]

2. Description of the Related Art Conventionally, in a compact disk player, which is an optical disk apparatus, an optical pickup irradiates a laser beam onto an information recording surface of the compact disk and processes the result of receiving the return light to record the information on the compact disk. It reproduces various types of data.

Such an optical pickup includes a type in which a light-emitting element and a light-receiving element are separately arranged, and a type in which an optical integrated element in which a light-emitting element and a light-receiving element are integrated is used. In addition, the size can be reduced as compared with the former, and the reliability can be improved.

[0004]

By the way, in an optical disk apparatus for reproducing a DVD, if an optical pickup is constituted by using an optical integrated element, the overall shape can be reduced in size by that much.
It can be simplified. Further, it is considered that such a DVD optical disk device is convenient if a compact disk can be reproduced.

In this case, a light emitting element and a light receiving element for a DVD and a light emitting element and a light receiving element for a compact disk are integrated to form an optical integrated element, thereby forming an optical disk apparatus capable of reproducing a compact disk and a DVD. It is considered possible.

However, when the light emitting element and the light receiving element are integrated for the compact disc and the DVD, respectively, there is a problem that the configuration of the optical integrated element becomes complicated.

The present invention has been made in view of the above points, and an object of the present invention is to propose an optical integrated device, an optical pickup, and an optical disk device capable of accessing a plurality of types of optical disks with a simple configuration.

[0008]

According to the first, fourth or seventh aspect of the present invention, an optical integrated device is applied to an optical integrated device, an optical pickup or an optical disk device. A first laser light source that emits a first laser beam at a first wavelength, and a first laser light source that is separated by a predetermined distance from the first laser light source;
A second laser light source that emits a second laser beam with a second wavelength different from the wavelength of the second laser light, a return light corresponding to the first laser beam, and a return light corresponding to the second laser beam. A diffraction grating that decomposes into a plurality of light beams, and a return light corresponding to the first laser beam and a return light corresponding to the second laser beam for at least a predetermined light beam among the light beams decomposed by the diffraction grating. A light receiving element for receiving light in common is provided.

According to the first, fourth, or seventh aspect of the present invention, the second laser light source is disposed at a predetermined distance from the first laser light source. A return light corresponding to the first laser beam and a return light corresponding to the second laser beam can be received by a common light receiving element by decomposing the return light into a plurality of light beams by the diffraction grating; The entire configuration can be simplified accordingly.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(1) Configuration of Embodiment FIG. 2 is a schematic diagram showing an optical system of an optical disk device according to an embodiment of the present invention. This optical disc device 1
The data recorded on the optical disk 2B as a VD and the data recorded on the optical disk 2A as a compact disk are reproduced.

Here, the compact disk 2A reproduces recorded data by processing return light obtained by irradiating a laser beam to the information recording surface through a transparent substrate having a thickness of 1.2 [mm]. This is an optical disk that can be used. In contrast, DVD2B has a thickness of 0.6
This is an optical disc that can reproduce recorded data by processing return light obtained by irradiating a laser beam onto an information recording surface through a [mm] transparent substrate.

In the optical disk device 1, the optical pickup 3 is arranged so as to be movable in a radial direction of the optical disk by a predetermined thread mechanism. The optical pickup 3 irradiates the optical disk 2A or 2B with the laser beam emitted from the optical integrated element 4 via the collimator lens 5, the aperture 6, and the objective lens 7, and returns the return light obtained from the optical disk 2A or 2B to the objective lens. 7, aperture 6, collimator lens 5, optical integrated device 4
Incident on.

The optical disk device 1 processes the result of receiving the return light in the optical integrated device 4 to generate various signals necessary for reproducing the compact disk 2A and the DVD 2B. The optical disc apparatus 1 moves the objective lens 7 to perform tracking control and focus control based on the tracking error signal and the focus error signal out of these signals, and processes the reproduction signals to execute the optical discs 2A and 2A.
The data recorded in B is reproduced.

Here, the optical integrated device 4 is formed by integrally integrating a light emitting device and a light receiving device into one package, and has a wavelength of 780 [nm] provided for reproduction of the compact disk 2A under the control of a system controller (not shown). Laser beam, wavelength 650 for DVD2B reproduction
[Nm] is selectively emitted. The optical integrated element 4 receives the return light obtained by the irradiation of the laser beam with a predetermined light receiving element, and outputs a light receiving result.

The collimator lens 5 includes the optical integrated element 4
The emitted laser beam is converted into a substantially parallel light beam and emitted.

The aperture 6 has a circular opening formed at the center by depositing a dielectric film on a transparent plate member. In the aperture 6, a dielectric film is formed in a portion surrounding the opening, and this dielectric film selectively blocks light having a wavelength of 780 [nm] which is a wavelength of a laser beam for a compact disk, and a laser for DVD. Wavelength 6 which is the wavelength of the beam
The filter is configured to transmit 50 [nm] light. As a result, the aperture 6 transmits the laser beam for a compact disc by shaping the beam shape according to the beam diameter determined by the aperture, while transmitting the laser beam for a DVD without changing the beam shape at all. It has been made like that.

The objective lens 7 is an aspherical plastic lens formed by injection molding of a transparent resin. By selecting the refractive index of the transparent resin and the shape of each lens surface, a DVD which is incident by almost parallel rays of light. The laser beam for compact disk and the laser beam for compact disk can be focused on the information recording surfaces of the corresponding optical disks 2A and 2B, respectively. Thus, the objective lens 7 constitutes a so-called bifocal lens corresponding to the laser beam for DVD and the laser beam for compact disc.

Further, the objective lens 7 is configured to be movable in the radial direction of the optical discs 2A and 2B by a tracking control actuator constituted by a voice coil motor, whereby the actuator is driven in accordance with a tracking error signal to perform tracking. It has been made controllable. Further, the actuator is configured to be movable along the optical axis of the laser beam by a similar actuator, so that focus control can be performed by driving the actuator according to a focus error signal.

The matrix operation circuit 9 includes the optical integrated device 4
A matrix calculation process is performed on the light reception result output from the pit line, a tracking error signal TE whose signal level changes according to the tracking error amount, a focus error signal FE whose signal level changes according to the focus error amount, and a pit row. To generate a reproduction signal RF whose signal level changes.

FIG. 1A is a cross-sectional view showing the optical integrated device 4 taken along a radial direction of the optical disks 2A and 2B, and FIG. It is a top view showing an element. The optical integrated device 4 includes a semiconductor laser diode chips 15A and 1A on a semiconductor substrate 17.
5B are arranged, the semiconductor substrate 17 is housed in a predetermined package, wired, and then sealed with a lid glass 19 as a transparent sealing member.

Here, the light receiving element 20 is formed on the semiconductor substrate 17, and in the optical integrated element 4, the semiconductor laser diode chips 15A and 15B and the light receiving element 20 are arranged side by side in the radial direction of the optical disks 2A and 2B.

Here, the light receiving element 20 has a rectangular light receiving surface 20A and 2B which are arranged in the radial direction of the optical disks 2A and 2B.
0B and rectangular light receiving surfaces 20C and 20D arranged in the circumferential tangent direction of the optical disks 2A and 2B with the rectangular light receiving surfaces 20A and 20B interposed therebetween.

Of these light receiving surfaces 20A to 20D, the rectangular light receiving surface 20A disposed on the semiconductor laser diode side receives light by predetermined dividing lines extending in the radial direction and the circumferential tangential direction of the optical disks 2A and 2B. The surface is divided into crosses, and the light receiving results of the divided light receiving surfaces A to D can be output.

On the other hand, the rectangular light receiving surface 20B following the light receiving surface 20A is divided into two by a predetermined dividing line extending in the radial direction of the optical disks 2A and 2B.
The light receiving results of the divided light receiving surfaces L and M can be respectively output.

The lid glass 19 has diffraction gratings 19 on both sides.
A and 19B are formed. Among them, the diffraction grating 19B formed on the surface on the side of the semiconductor laser diode chips 15A and 15B converts the laser beams LA and LB emitted toward the optical disks 2A and 2B into 0-order, -1st-order, and + 1st-order diffracted light. Decompose and emit. Thus, in the optical disc device 1, tracking control can be performed by a so-called three-beam method as needed.

On the other hand, the diffraction grating 19B formed on the surface on the opposite side is a hologram diffraction grating, which decomposes the return light from the optical disks 2A and 2B and decomposes the light receiving surface 20A.
-20D, thereby enabling the optical integrated device 4 to generate a tracking error signal and the like as needed.

That is, as shown in FIG. 1, the diffraction grating 19B has a grating area of the optical discs 2A, 2B as shown in a view partially enlarged by the reference character A and viewed from the optical disc side in comparison with FIG. Are divided into two regions by a predetermined dividing line extending in the circumferential tangential direction, and the region on the side of the semiconductor laser diode chips 15A and 15B is further divided into two regions AR1 and AR2 by the dividing line extending in the radial direction. Is divided into

One region AR1 of the regions on the semiconductor laser diode chip 15A and 15B side emits the return light due to the zero-order diffracted light by the diffraction grating 19B toward the light receiving surfaces A and B, and remains. The return light due to the -1st-order and 1st-order diffracted light is emitted to the light receiving surfaces E and F on the sides closer to the semiconductor laser diode chips 15A and 15B. Similarly, the area AR2 emits the return light of the 0th-order diffracted light toward the subsequent light receiving surface C, and emits the return light of the remaining −1st and 1st order diffracted light to the light receiving surfaces E and F. I do. On the other hand, the remaining semiconductor laser diode chips 15A and 15A
The area AR3 farther than 5B emits return light of the 0th-order diffracted light to the light receiving surfaces L and M, and returns the return light of the remaining −1st and 1st order diffracted light to the light receiving surfaces E and F. Light is emitted to a side farther than the diode chips 15A and 15B.

The laser beam LA for a compact disk will now be described. When the laser beam LA is emitted toward the optical disk 2A, the optical integrated device 4 uses the diffraction grating 19B to convert the laser beam LA into a zero-order laser beam.
The light is decomposed into -1st and + 1st order diffracted light and emitted. Further, as a result, the 0th order, -1st order, +1 order obtained from the optical disk 2A are obtained.
The return light by the 0th-order diffracted light among the return lights by the next diffracted light forms the beam spot SPA at predetermined positions on the light receiving surfaces 20A and 20B.
A is emitted toward A and 20B. As a result, the optical integrated device 4 is configured to perform, based on the light receiving results of the light receiving surfaces 20A and 20B,
The reproduction signal (A +
B + C + D + L + M). In a similar manner, the Foucault error signal ((A + D)-(B + C)) can be generated by the Foucault method. In addition, the optical integrated element 4 emits return light due to -1st-order and + 1st-order diffracted light toward the light receiving surfaces 20C and 20D by the diffraction grating 19A, and thereby, based on the light receiving result by the light receiving surfaces 20C and 20D, 3
A tracking error signal (EF) by a beam method can be generated.

On the other hand, the laser beam LB for the DVD 2B will be described. The integrated element 4 similarly diffracts the laser beam LB emitted toward the optical disk 22B by the diffraction grating 19B in the 0th, -1st, and + 1st order. Decomposes into light. Further, these 0th order,-
The return light by the 0th-order diffracted light among the return lights by the 1st-order and + 1st-order diffracted light forms the beam spot SPB on the light-receiving surfaces 20A and 20B.
Light is emitted toward A and 0B. Thereby, the light receiving surface 20A
And the reproduced signal (A + B + C + D + L +) whose signal level changes according to the pit row based on the light receiving results of
M) and the Foucault error signal ((A + D)-(B + C)) by the Foucault method, and furthermore, the DPD (Differential P
tracking error by the hase detection method. In this embodiment, even when processing DVD2B,
The optical integrated element 4 emits return light due to -1st and + 1st order diffracted light toward the light receiving surfaces 20C and 20D by the diffraction grating 19A. However, in this embodiment, the light receiving results of light receiving surfaces 20C and 20D are D
It is not used for VD2B playback.

In this way, the optical integrated device 4 applies the laser beam LB for DVD and the laser beam LA for compact disk to the light receiving surface 20A obtained by dividing the light receiving surface in a cross-shaped manner. The positions of the semiconductor laser diode chips 15A and 15B are adjusted so that the beam spots SPB and SPA are formed substantially at the same position, and the diffraction angle and the like of the diffraction grating 19B are set.

That is, the following relational expression basically holds between the diffraction angle θ of the return light emitted from the diffraction grating, the wavelength λ of the return light, and the repetition pitch p of the diffraction grating.

[0034]

(Equation 1)

Thus, for example, the hologram diffraction grating 19
When the repetition pitch p in A is 4 [μm], the wavelength 780 used for reproduction of the compact disc 2A
In the laser beam LA of [nm], the diffraction angle θA of the return light is 11.24 degrees, whereas the laser beam LB of the wavelength 650 [nm] to be used for reproducing the DVD 2B is used.
, The diffraction angle θB of the return light is 9.35 degrees.

In the optical integrated device 4, the diffraction angle θA
The semiconductor laser diode chip 15A for a compact disk, which has a larger θB and θB, is disposed on the side farther than the light receiving surface 20A, and the light emitting point of the semiconductor laser diode chip 15A for the compact disk and the semiconductor laser diode chip 15B for DVD Are set to be separated from the light emitting point by a predetermined distance D. In the optical integrated device 4, as described above, even if the diffraction angles θA and θB are different, the light receiving surface 20A obtained by dividing the light receiving surface into
In this case, the distance D is selected so that the centers of the beam spots SPB and SPA caused by the return light in the laser beam LB for DVD and the laser beam LA for compact disc substantially coincide with each other.

The distance D varies variously depending on the distance from the light receiving surface of the light receiving element 20 to the hologram diffraction grating 19A, the design of the hologram diffraction grating 19A, etc.
The range of 0 [μm] to 500 [μm] is almost a practical range.

Thus, in the light receiving element 20,
As shown by a reference sign SPA, a beam spot of the return light by the laser beam LA is shown. As for the light receiving surfaces 20B to 20D other than the light receiving surface 20A, the diffraction angle θA and θB are different from each other, so that the semiconductor light is focused on the DVD 2B. The return light by the laser beam LA is focused on the laser diode chips 15A and 15B and at a position farther from the central light receiving surface 20A. In the optical integrated device 4, the upper and lower light receiving surfaces 20C and 20D and the remaining rectangular light receiving surface 20B also receive the beam spot SPA condensed at a position farther away than in the case of the DVD 2B. A light receiving surface is formed so as to be able to use the same method as when accessing the DVD 2B, and when accessing the compact disk 2A using the same light receiving element, the push-pull method (PP = (A + B + L)-) is used instead of the DPD method. (C + D + M)) to generate a tracking error signal.

Thus, in the matrix operation circuit 9 (FIG. 2), when the DVD 2B is reproduced, the light-receiving result of the light-receiving surface 20A obtained by dividing the light-receiving surface into a cross shape is subjected to current-voltage conversion processing, The phase comparison result of the current-voltage conversion processing result represented by the light receiving surface A + B on the side closer to the laser diode chip side and the light receiving surface C + D on the far side is obtained. A phase comparison result is obtained from the light reception result, and a difference signal of the phase comparison result is generated to generate a tracking error signal TE by the DPD method.

Further, the result of the current-voltage conversion by the light receiving surface 20A is added, and A + B + C + D is calculated using the light receiving surfaces A to D.
Generates a reproduction signal RF represented by Similarly, a focus error signal FE represented by (A + D)-(B + C) is generated.

On the other hand, when reproducing the compact disk 2A, the matrix operation circuit 9 generates the reproduction signal RF and the focus error signal FE in the same manner as when reproducing the DVD 2B. On the other hand, a difference signal (EF) is obtained from the current-voltage conversion result between the upper and lower light receiving surfaces F and E.
Is generated, thereby generating a tracking error signal by the three-spot method.

(2) Operation of the Embodiment In the above configuration, the optical disc apparatus 1 (FIG. 2) uses the optical pickup 3 to irradiate the optical discs 2A and 2B with a laser beam, receive its return light, and The information recorded on the optical disks 2A and 2B is reproduced by processing the result of receiving the return light by the signal processing circuit.

That is, in the optical disk device 1, the optical pickup 3 emits a laser beam from the optical integrated device 4, and this laser beam is converted into a substantially parallel light beam by the collimator lens 5, and then passes through the aperture 6 to pass through the objective lens. , And is focused on the information recording surfaces of the optical disks 2A and 2B by the objective lens 7. The return light obtained by the irradiation of the laser beam is received by the objective lens 7 and is incident on the optical integrated device 4, and the optical integrated device 4 obtains a result of receiving the return light.

In the optical disk device 1, a tracking error signal TE is generated from the result of receiving the return light, and the objective lens 7 is movable in the radial direction of the optical disks 2A and 2B so that the tracking error signal TE has a predetermined signal level. Tracking control is performed. Similarly, a focus error FE signal is generated, and the objective lens 7 is moved up and down so that the focus error signal FE has a predetermined signal level, thereby performing focus control.

In the series of operations of the optical pickup, the optical disk loaded in the optical disk device 1
In the case of the VD2B, the optical integrated device 4
, The semiconductor laser diode chips 15A and 15A arranged in the radial direction of the optical disks 2A and 2B.
5B (FIG. 1), a laser beam LB is selectively emitted from the semiconductor laser diode chip 15B for DVD, and this laser beam LB is decomposed into three diffracted lights by the diffraction grating 19B and irradiated to the DVD 2B. . The return light from the DVD 2B is further decomposed into a plurality of light beams by the hologram diffraction grating 19A and received by the light receiving element 20.

In the optical disk device 1, the result of light reception by the light receiving element 20 is processed by the matrix operation circuit 9, and the tracking error signal TE,
Focus error signal FE by Foucault method, DVD2
A reproduction signal RF whose signal level changes in accordance with the pit string formed in B is generated.
Various information recorded in D2B is reproduced.

On the other hand, when the compact disk 2A is loaded, in the optical disk device 1, of the semiconductor laser diode chips 15A and 15B (FIG. 1),
Laser beam LA is selectively emitted from semiconductor laser diode chip 15A for a compact disk,
The laser beam LA is applied to the compact disk 2A in the same manner as in the case of the DVD 2B, and the return light from the compact disk 2A is received by the light receiving element 20 common to the DVD 2B.

As described above, when the return light is received,
The optical disc device 1 compensates for the difference between the diffraction angles θA and θB in the hologram diffraction grating 19A, and
A on the light-receiving surface 20A obtained by dividing A into
The semiconductor laser diode chip 15B for the DVD 2B and the semiconductor laser diode chip 15B for the DVD 2B are so arranged that the beam spots SPB and SPA are converged at substantially the same place when reproducing the VD 2B and when reproducing the compact disk 2A. Semiconductor laser diode chip 15
Since A is spaced apart from the light receiving element 20, return light from different types of optical disks 2A and 2B can be received by one light receiving element 20 in common.

That is, the compact disc 2A and the DV
D2B is characterized in that the method of generating the tracking error signal TE is different due to the difference in the wavelength of the laser beam used for reproduction and the difference in the depth of the pit.

As a result, in the optical disk device 1, the configuration of the optical integrated device 4 can be simplified, and the overall configuration can be simplified correspondingly to access a plurality of types of optical disks.

(3) Effects of the Embodiment According to the above configuration, laser light sources having different wavelengths are arranged at a predetermined distance from each other so as to compensate for the difference in the diffraction angle due to the diffraction grating. Return light from different laser light sources can be received by a common light receiving element, and the structure of the spectral integration device, optical pickup, and optical disk device can be simplified, and a plurality of types of optical disks can be accessed.

(4) Other Embodiments In the above embodiment, the case where the semiconductor laser diode chips 15A and 15B and the light receiving element 20 are arranged side by side in the radial direction of the optical disks 2A and 2B has been described. The present invention is not limited to this, and may be arranged side by side in the circumferential tangent direction of the optical disc.

In the above-described embodiment, the case where the objective lens is constituted by the bifocal lens has been described. However, the present invention is not limited to this, and a two-wavelength hologram is formed on the lens surface of the objective lens to obtain a different wavelength. For example, various condensing means for condensing laser beams having different wavelengths can be widely applied.

In the above embodiment, the DPD
The method has been described in which the tracking error signal is generated by the three-spot method and the focus error signal is generated by the Foucault method. However, the present invention is not limited to this. Thus, various production methods can be widely applied.

Further, in the above-described embodiment, a case has been described in which a light receiving surface is divided into a cross shape and a light receiving result is added to generate a reproduced signal. Not limited to this, when the reproduction signal is generated using the light receiving result of the other light receiving surface 20B or the like, further, the reproduction signal is generated by adding the light receiving result of the other light receiving surface 20B or the like and the light receiving result of the light receiving surface 20A. For example, various generation methods can be widely applied to the reproduction signal generation method.

In the above embodiment, the case where the semiconductor laser diode chips 15A and 15B are arranged on the semiconductor substrate 17 with a predetermined distance D therebetween has been described. However, the present invention is not limited to this, and the wavelength is not limited to this. A plurality of different laser diodes may be integrated on one semiconductor chip. In this case, since the accuracy of the arrangement based on the distance D can be improved, the yield can be improved accordingly, and the size of the optical integrated device can be reduced.

In the above-described embodiment, the case where a compact disc and a DVD are reproduced has been described. However, the present invention is not limited to this, and is widely applied to, for example, a case where a compact disc and a CD-R are accessed. be able to.

In the above-described embodiment, the case of accessing two types of optical disks has been described. However, the present invention is not limited to this, and can be widely applied to the case of accessing a plurality of types of optical disks.

[0059]

As described above, according to the present invention, when returning light is decomposed by a diffraction grating and received by a light receiving element, laser light sources having different wavelengths are set so as to compensate for the difference in diffraction angle due to the diffraction grating. By arranging them at a distance, the light receiving element can be shared and a plurality of types of optical disks can be accessed with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view and a plan view showing an optical integrated device in an optical disc device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating an optical system of the optical disc device according to the embodiment of the present invention.

[Explanation of symbols]

1 optical disk device, 2A, 2B optical disk, 4
… Optical integrated device, 15A, 15B… Semiconductor laser diode chip, 19A… Hologram, 20… Light receiving device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 7/135 G11B 7/135 Z H01L 31/10 H01S 5/40 H01S 5/40 H01L 31/10 A ( 72) Inventor Satoshi Nakano 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo, Sony Corporation (72) Inventor Satoshi Imai 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Hiroaki Yukawa 6-7-35 Kita Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation

Claims (9)

[Claims] 1. An optical integration system for irradiating an optical disk with a first or second laser beam through an objective lens, receiving return light of the laser beam obtained through the objective lens, and outputting a light reception result. An element, a first laser light source that emits the first laser beam at a first wavelength, and a first laser light source that is separated from the first laser light source by a predetermined distance, and is different from the first wavelength. A second laser light source that emits the second laser beam with a second wavelength; the return light corresponding to the first laser beam; and the return light corresponding to the second laser beam. A diffraction grating that decomposes into a plurality of light beams; and at least a predetermined light beam among the light beams decomposed by the diffraction grating, the return light corresponding to the first laser beam. And a light receiving element for receiving the return light corresponding to the second laser beam in common. 2. The optical integrated device according to claim 1, wherein said first and second laser light sources are integrated on one semiconductor chip. 3. The method according to claim 1, wherein the first and second wavelengths are 650 [nm] and 780 [nm], respectively, and the predetermined distance is in a range of 10 [μm] to 500 [μm]. The optical integrated device according to claim 1, wherein 4. An optical pickup for irradiating an optical disk with a first or second laser beam emitted from an optical integrated device and receiving return light of the laser beam by the optical integrated device, wherein the optical integrated device A first laser light source that emits the first laser beam at a first wavelength, and a second laser light source that is separated from the first laser light source by a predetermined distance and is different from the first wavelength. A second laser light source that emits the second laser beam according to a wavelength; a plurality of light fluxes each of the return light corresponding to the first laser beam and the return light corresponding to the second laser beam; A diffraction grating that decomposes into, and at least a predetermined light beam among the light beams decomposed by the diffraction grating, the return light corresponding to the first laser beam; Optical pickup and having a light receiving element for receiving said return beam to a common corresponding to the second laser beam. 5. The optical pickup according to claim 4, wherein the first and second laser light sources are integrated on one semiconductor chip. 6. The method according to claim 1, wherein the first and second wavelengths are 650 [nm] and 780 [nm], respectively, and the predetermined distance is in a range of 10 [μm] to 500 [μm]. The optical pickup according to claim 4, wherein 7. An optical disc apparatus for irradiating an optical disc with a first or second laser beam emitted from an optical pickup, receiving return light of the laser beam by the optical pickup, and processing a light reception result. The optical pickup irradiates an optical disc with the first or second laser beam emitted from the optical integrated device via an objective lens, and receives return light of the laser beam by the optical integrated device, The optical integrated device is disposed at a predetermined distance from the first laser light source that emits the first laser beam at a first wavelength, and is different from the first wavelength. A second laser light source that emits the second laser beam with a second wavelength; and the return light corresponding to the first laser beam. A diffraction grating for decomposing the return light corresponding to the second laser beam into a plurality of light beams, and at least a predetermined light beam of the light beams decomposed by the diffraction grating is converted into the first laser beam. An optical disc device, comprising: a light receiving element that commonly receives the corresponding return light and the return light corresponding to the second laser beam. 8. The optical disk device according to claim 7, wherein said first and second laser light sources are integrated on one semiconductor chip. 9. The method according to claim 1, wherein the first and second wavelengths are 650 [nm] and 780 [nm], respectively, and the predetermined distance is in a range of 10 [μm] to 500 [μm]. The optical disk device according to claim 7, wherein