JP3455675B2 - Optical pickup device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup device capable of recording / reproducing on a plurality of different types of media.

[0002]

2. Description of the Related Art Generally, a CD-R (Compact Disk-Recordable) or CD-R is used as a write-once or rewritable optical disk capable of recording / reproducing information using a laser beam.
There are RW (CD-Rewritable) and the like. In these CD type optical discs, the track pitch is C such as Orange Book.
It is standardized to 1.6 μm based on the D standard. Corresponding to this, the wavelength of the laser light used is about 780 nm.

An optical pickup device for this purpose, as shown in FIG. 8, for example, emits light having a wavelength of 780 nm emitted from a semiconductor laser 1 to a polarization beam splitter 2, λ.
The return light reflected by the optical disc 5 of the CD system through the / 4 wavelength plate 3 and the objective lens 4 is condensed and irradiated, and after passing through the objective lens 4 and the λ / 4 wavelength plate 3 again, it is polarized. The light is reflected by the polarization reflection surface 2a of the beam splitter 2 and is incident on the light receiving element 6 to detect light reception.

On the other hand, in recent years, as a next-generation optical disc, in order to achieve higher density and larger capacity, for example,
A DVD (Digital Versatile Disk) type optical disc whose track pitch is narrowed from the current 1.6 μm to about 0.8 μm is in the practical stage. Corresponding to this,
The wavelength of the laser light used is about 635 nm.

[0005]

SUMMARY OF THE INVENTION Under such circumstances,
When attempting to record / reproduce on / from a plurality of optical discs of different standards, a dedicated optical pickup device is required depending on the standards (wavelength used, numerical aperture NA of lens, thickness of cover glass, etc.). That is, in the case of handling a DVD type optical disc, another optical pickup device having the wavelength 635 specification with the configuration shown in FIG. 8 is required. Conversely, if the optical disc standard is different, it will be 1
It is inconvenient because the optical pickup device on the stand cannot reproduce or record.

Therefore, an object of the present invention is to provide an optical pickup device capable of reproducing or recording as efficiently as possible with a single device provided with two laser light sources even for optical discs of different standards.

[0007]

The invention according to claim 1 is
An objective lens facing the optical disc, a polarization beam splitter disposed on the optical axis of the objective lens and having a polarization reflection surface, the objective lens and the polarization beam splitter
And a first laser in which the orientation of the plane of polarization of the emitted light is set so that the laser light of the S-polarized component is incident on the reflection side of the polarization reflection surface. A first light source and a first light receiving element that integrally receives a return light reflected from the optical disc and reflected by the polarization reflection surface;
And a wavelength different from the wavelength of the laser light of the first laser light source, in which the orientation of the polarization plane of the emitted light is set so that the laser light of the P polarization component is incident on the transmission side of the polarization reflection surface. A second laser light source, which is used alternatively, and a second light receiving element which receives the return light reflected from the optical disc and transmitted through the polarization reflection surface,
E Bei the light source unit, the said the first light source second
Of the second light source and the first light source are paired with each other.
It forms a pair with the light receiving element .

Therefore, the emitted light of the S-polarized component emitted from the first laser light source is reflected by the polarization reflection surface of the polarization beam splitter, is irradiated onto the optical disc through the objective lens, and is emitted from the second laser light source. The emitted light of the P-polarized component passes through the polarization reflection surface of the polarization beam splitter and is irradiated onto the optical disc through the objective lens. That is, in one optical pickup device, recording and reproduction can be performed only by selecting the laser light source that is compatible with the optical disc. In this case, since the S polarization component and the P polarization component in which the polarization planes of the first and second laser light sources are orthogonal to each other and the polarization beam splitter are used, the loss in the polarization beam splitter is small and the light utilization efficiency is good. . In addition, the wave plate is
Functioning as a first light source unit,
When using the light source, the second light source unit receives the second light source unit.
It is configured to use an optical element, and the second light source unit of the second
When using the laser light source of
The configuration uses one light receiving element, and in any case
Reduce the return light to the laser source side
This is an advantageous configuration that can increase the amount of these signals .

According to a second aspect of the present invention, there is provided the optical pickup device according to the first aspect , wherein the first laser light source is used.
The emitted light of is not completely reflected by the polarized reflection surface, and,
The light emitted from the second laser light source is reflected by the polarization reflection surface.
The polarization direction of the polarized reflection surface so that it is not completely transmitted.
With respect to the plane of polarization of the light emitted from the first laser light source
The polarization plane of the light emitted from the second laser light source is
The first laser light source is arranged so as to rotate by a predetermined angle.
Out of the light emitted from the
At the position where a part of the outgoing light that is transmitted to
Note that the polarized light reflected from the light emitted from the second laser light source
Part of the emitted light that is reflected by the surface without being completely transmitted
Wherein is disposed at a position in said first laser light source second
Equipped with a light receiving element for monitoring that is shared with other laser light sources
It

Therefore, the polarization planes of the emitted light beams emitted from the first and second laser light sources are completely reflected and completely reflected by the polarization reflection planes of the polarization beam splitter so that a desired detection output can be obtained by the monitor light receiving element. Since it is arranged by rotating by a predetermined angle so as not to be transmitted, the light output of the first and second laser light sources can be shared by sharing one monitor light receiving element without impairing the selectivity of the laser light source. You can control.

[0011]

[0012]

According to a third aspect of the present invention, in the optical pickup device according to the first or second aspect , the wavelength plate has a wavelength of light emitted from the first light source and a wavelength of light emitted from the second light source. It has an intermediate wavelength specification.

Therefore, one wavelength plate can be efficiently shared by the emitted lights of different wavelengths emitted from the first and second laser light sources.

According to a fourth aspect of the present invention, in the optical pickup device according to the first or second aspect , each of the first and second light source units passes the light emitted from the mounted self-unit side light source. A light source grating formed in a wavelength specification of emitted light from the self-unit side light source in a region that does not pass the return light reflected from the optical disc side,
And a grating for a light receiving element which is formed to have a wavelength specification of the light emitted from the light source on the other unit side which forms a pair and guides the return light to a light receiving element on which the light is mounted.

Therefore, regarding the first and second light source units, the emission characteristics from the laser light source toward the optical disk side are not impaired, and the condensing characteristics of the reflected light from the optical disk side on the light receiving element are impaired. Nor.

According to a fifth aspect of the present invention, in the optical pickup device according to the fourth aspect, an optical component formed to have a wavelength specification of emitted light from the first or second laser light source is provided on a common optical path. And a grating for a light-receiving element for the second or first light-receiving element on the side not conforming to the wavelength specification of the optical component is provided for the light emitted from the second or first laser light source for the light-receiving element. It has a shape for correcting the aberration of the optical component depending on the wavelength.

Therefore, the aberration associated with the incidence of the emitted light beams of different wavelengths from the other laser light source on the optical components such as the collimator lens constructed according to the wavelength specifications of the emitted light beams of the one laser light source corresponds. Since the light is corrected when it enters the light-receiving element grating on the side, a normal light-receiving detection operation can be performed.

[0019]

[0020]

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment of the present invention.
It will be described with reference to FIG. An outline of the configuration of the optical pickup according to the present embodiment will be described with reference to FIG. First, the objective lens 12 facing the optical disc 11 loaded in the optical disc drive device is provided. On the optical axis of the objective lens 12, a collimator lens 13, a wave plate 14,
Optical components such as the polarization beam splitter 15 are provided. The polarization beam splitter 15 converts the light of S polarization component into 10
It has a property of transmitting 0% of the P-polarized light component and transmitting 100% of the P-polarized component light, and is provided with a polarization reflection surface 15a of 45 degrees with respect to the optical axis of the objective lens 12. The first light source unit 16 is arranged on the reflection-side optical axis of the polarization reflection surface 15a, and the second light source unit 17 is arranged on the transmission-side optical axis of the polarization reflection surface 15a.

The first light source unit 16 is configured as a hologram laser, for example, as shown in FIG.
A first laser light source 18 having a semiconductor laser chip configuration and a first laser light source 18.
The light receiving element 19, the light source grating 20, and the light receiving element grating 21 are integrally configured as one element. The second light source unit 17 is also structurally the first
2, which is similar to that of the light source unit 16 of FIG. 2, is configured as a hologram laser, and has a second laser light source 22, a second light receiving element 23, and a light source grating 24, which are semiconductor laser chip configurations. The light-receiving element grating 25 is integrally configured as one element (reference numerals are shown in parentheses).

Here, the wavelength of the emitted light emitted from the first laser light source 18 is set to 780 nm corresponding to the CD standard, and the wavelength of the emitted light emitted from the second laser light source 22 corresponds to the DVD standard, for example. It is set to 635 nm.
Further, the orientation of the polarization plane of the emitted light emitted from the first laser light source 18 is set so that the S-polarized component is incident on the reflection side of the polarization reflection surface 15a. Second laser light source 22
The direction of the polarization plane of the outgoing light emitted from the
It is set so that the P-polarized component is incident on the transmission side of a. That is, as shown in the schematic diagram of FIG. 3, the polarization plane of the emitted light of the first laser light source 18 and the polarization plane of the emitted light of the second laser light source 22 are set to be orthogonal to each other. First
First light receiving element 19 provided in the light source unit 16 of
Although not shown in the figure, it has a plurality of light receiving regions having a divided structure for detecting a focus servo, a tracking servo, an RF reproduction signal, etc., but a second light source unit 17 having a wavelength of 635 nm is provided in the second light source unit 17. It is set to form a pair with the laser light source 22. Second light source unit 1
The second light-receiving element 23 provided in 7 has a plurality of light-receiving regions having a divided structure for detecting focus servo, tracking servo, RF reproduction signal, etc. It is set so as to make a pair with the first laser light source 18 having a wavelength of 780 nm provided in the unit 16.

The light source grating 20 is a grating formed in a region through which the light emitted from the mounted self-unit side light source (first laser light source 18) is transmitted and the return light reflected from the optical disk 11 side is not transmitted. It has a grating shape (see the balloon portion in FIG. 2) that generates 0th order light and ± 1st order light by the three-beam method. The groove shape, pitch, etc. of this grating are set to the wavelength of 780 nm of the first laser light source 18. The light source grating 24 is a grating formed in a region through which the light emitted from the mounted self-unit side light source (second laser light source 22) is transmitted and the return light reflected from the optical disc 11 side is not transmitted, and the three-beam method is used. It has a grating shape (see the balloon portion in FIG. 2) for generating 0th order light and ± 1st order light. The groove shape of this grating,
The pitch and the like are specified to the wavelength of 635 nm of the second laser light source 22.

On the other hand, the light receiving element grating 21 is
The other unit side light source which forms a pair (second laser light source 22)
It has a predetermined grating shape, which is formed to have a wavelength of 635 nm of the emitted light from and is guided by diffracting and returning the return light to each light receiving region of the mounted first light receiving element 19 (see a balloon portion in FIG. 2). Similarly, the light-receiving element grating 25 is formed on the second light-receiving element 23 having the wavelength of 780 nm of the light emitted from the other unit-side light source (first laser light source 18) that is paired with the return light. It has a predetermined grating shape which is diffracted and guided to each light receiving region (see a balloon portion in FIG. 2).

The above-mentioned wave plate 14 corresponds to a so-called λ / 4 wave plate, but in the present embodiment, it is located on the common optical path of the light emitted from the first and second laser light sources 18 and 22. Their wavelengths of 780 nm and 635 nm
The one with the intermediate wavelength specification is used. The collimating lens 13 provided for beam shaping is designed to have one wavelength specification, in the present embodiment, the specification of the wavelength of the light emitted from the first laser light source 18 at 780 nm.

In such a structure, the optical disk 11
When a CD type is used as, a pair of the first laser light source 18 and the second light receiving element 23 is selected, and the configuration substantially shown in FIG. 4A is obtained. First laser light source 18
The emitted light having a wavelength of 780 nm is emitted from the first light source unit 16 via the light source grating 20 and the light receiving element grating 21, and enters the polarization reflection surface 15a of the polarization beam splitter 15 as an S polarization component. Therefore, it is 100% reflected by the polarized light reflection surface 15a, enters the objective lens 12 through the wavelength plate 14 and the collimator lens 13, and is focused and irradiated as a spot on the optical disc 11 by the objective lens 12. Optical disc 1
The return light reflected from 1 again passes through the objective lens 12, the collimator lens 13 and the wave plate 14 and returns to the polarization reflection surface 15 a of the polarization beam splitter 15. Here, since this return light has passed through the wave plate 14 twice, it is incident on the polarization reflection surface 15a in the state of the P polarization component. Therefore, the return light passes through the polarization reflection surface 15a by 100% and travels toward the second light source unit 17 side. Here, the return light that has entered the light-receiving element grating 25 is imaged on the light-receiving area on the second light-receiving element 23 while being diffracted, and signals such as a focus servo signal, a tracking servo signal, and an RF reproduction signal are generated. can get.

On the other hand, when a DVD type optical disc 11 is used as the optical disc 11, a pair of the second laser light source 22 and the first light receiving element 19 is selected, and the configuration substantially shown in FIG. Become. The emitted light having a wavelength of 635 nm emitted from the second laser light source 22 is emitted from the light source grating 24,
The light is emitted from the second light source unit 17 through the light receiving element grating 25, and is incident on the polarization reflection surface 15a of the polarization beam splitter 15 as a P polarization component. Therefore, 100% of light is transmitted through the polarized light reflection surface 15a, enters the objective lens 12 through the wavelength plate 14 and the collimator lens 13, and is condensed and irradiated as a spot on the optical disk 11 by the objective lens 12. The return light reflected from the optical disk 11 passes through the objective lens 12, the collimator lens 13 and the wave plate 14 again, and returns to the polarization reflection surface 15a of the polarization beam splitter 15. Here, this return light is transmitted to the wave plate 14
Since it has passed through twice, it enters the polarization reflection surface 15a in the state of the S-polarized component. Therefore, the return light is reflected by the polarization reflection surface 15a by 100% and travels toward the first light source unit 16 side. Here, the return light that has entered the light-receiving element grating 21 is diffracted and is reflected by the first light-receiving element 1
An image is formed on the light receiving area on the beam 9, and signals such as a focus servo signal, a tracking servo signal, and an RF reproduction signal are obtained.

Therefore, according to the present embodiment, in one optical pickup device, recording / reproducing can be performed only by selecting the laser light source 18 or 22 having a wavelength suitable for the optical disk 11, so-called compatible player. Function as. In this case, the first and second laser light sources 18,
Since the S-polarized component and the P-polarized component of which the polarization planes of 22 are orthogonal to each other and the polarization beam splitter 15 are used, the optical pickup device has a small loss in the polarization beam splitter 15 and a high light utilization efficiency. When the wave plate 14 functions as an optical isolator and the first laser light source 18 of the first light source unit 16 is used, the second light receiving element 23 of the second light source unit 17 is used. When the second laser light source 22 of the light source unit 17 is used, the first light receiving element 19 of the first light source unit 16 is used.
In any case, it is possible to reduce the returning light to the laser light source side of the optical disk 11
This is an advantageous configuration that can increase the signal amount from. In this case, since the shared wavelength plate 14 has an intermediate wavelength specification between 780 nm and 635 nm, one wavelength plate 14 is used for the emitted light having different wavelengths emitted from the first and second laser light sources 18 and 22. Can be shared efficiently.

Further, the first and second light source units 16,
Reference numeral 17 denotes the self-unit side light sources 18 and 2 mounted respectively.
The light sources 18 and 22 on the self-unit side are provided in a region through which the emitted light from 2 passes and the return light reflected from the optical disc 11 side does not pass.
Light source gratings 20 and 24 formed to have a wavelength specification of light emitted from the other unit side light source 22,
The first and second light source units 16 and 17 are respectively provided with the light receiving element gratings 21 and 25 that are formed according to the wavelength specifications of the emitted light from the 18 and guide the return light to the light receiving elements 19 and 23 on which they are mounted. The light receiving element 1 that does not impair the emission characteristics of the laser light sources 18 and 22 toward the optical disk 11 side and that reflects the reflected light from the optical disk 11 side.
It does not impair the light condensing characteristics for 9 and 23.

By the way, the collimator lens 13 and the first light source unit 1 which are optical components arranged on the common optical path.
The relationship with the grating 21 for the light receiving element 6 will be described. FIG. 5 is an explanatory diagram showing the collimator lens 13 and the light-receiving element grating 21 extracted. Wavelength 7
Since the grating 25 for the light receiving element of the second light source unit 17 is formed in the 780 nm wavelength specification with respect to the 80 nm specification collimator lens 13, there is no particular problem. However, since the light receiving element grating 21 of the first light source unit 16 is formed to have the wavelength of 635 nm with respect to the collimating lens 13 having the wavelength of 780 nm, the second laser light source 22 having the wavelength of 635 nm and the first light receiving element are provided. In the case of DVD system compatible with
The 0 nm specification collimator lens 13 does not fit. Therefore, the light is reflected by the optical disk 11 and the collimator lens 1
3. When an image is formed on the first light receiving element 19 through the light receiving element grating 21, the light is not normally collected due to the influence of aberration due to wavelength mismatch, and tends to be divergent. In this regard, in the present embodiment, the wavelength 63 shown in FIG.
Regarding the light receiving element grating 21 of 5 nm specification,
A device such as a grating shape for correcting the aberration (for example, a curved grating shape) is provided. Therefore, laser light with a wavelength of 635 nm is emitted from the optical disc 1.
Even when the image is formed on the first light receiving element 19 through the collimating lens 13 having a wavelength of 780 nm and the light receiving element grating 21, the aberration is corrected at the stage of passing through the light receiving element grating 21. Therefore, the light is normally collected and can be shared without any trouble.

Further, in the present embodiment, the grating 21 for the light receiving element of the first light source unit 16 has a groove depth for extinguishing the 0th order light of the light emitted from the paired second light source 22 as much as possible. The grating 25 for the light receiving element of the second light source unit 17 has a groove depth for extinguishing the 0th order light of the light emitted from the paired first light source 18 as much as possible. here,
Since the extinction ratio and the depth of the groove of the grating have a relationship as shown in FIG.
The depth of the grating groove 5 may be set appropriately in relation to each wavelength. According to this, as in this embodiment, a signal component that is effective when the three-beam method is used ±
The primary light can be used efficiently.

A second embodiment of the present invention will be described with reference to FIG. The same parts as those shown in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. In the present embodiment, the polarization reflection surface 15a of the polarization beam splitter 15 is
A monitor light receiving element 26 shared by the first laser light source 18 and the second laser light source 22 is arranged at the reflection side transmission position and the transmission side reflection position. This monitor light receiving element 26 is the first laser light source 18 or the second laser light source 2
The first laser light source 18 by receiving a part of the emitted light from the second laser light source 18
Also, the second laser light source 22 is used for feedback control of the light amount so that the light output of the second laser light source 22 becomes a predetermined value. Here, so that a desired detection output can be obtained by the monitor light receiving element 26, that is, the emitted light from the first laser light source 18 is not completely reflected by the polarization reflection surface 15a, and similarly, the second light is emitted.
The polarization plane of the emission light from the first laser light source 18 and the polarization plane of the emission light from the second laser light source 22 are set so that the emission light from the laser light source 22 is not completely transmitted by the polarization reflection surface 15a. The polarization reflection surfaces 15a are arranged so that they are rotated by a predetermined angle with respect to the polarization direction of the polarization reflection surface 15a.

Therefore, according to the present embodiment, one monitor light receiving element 26 is shared and the first and second laser light sources 18 and 22 are shared without impairing the selectivity of the laser light sources 18 and 22. Can properly control the light output of.

[0035]

According to the first aspect of the present invention, the objective lens facing the optical disk, the polarizing beam splitter disposed on the optical axis of the objective lens and having the polarization reflection surface, and the reflection side of the polarization reflection surface. A first laser light source in which the orientation of the polarization plane of the emitted light is set so that the S-polarized component laser light is incident on the first optical source and a first light receiving element for receiving the return light reflected from the optical disc and reflected by the polarization reflection surface. First having and
Of the first light source unit, and the orientation of the polarization plane of the emitted light is set so that the laser light of the P-polarized component is incident on the transmission side of the polarization reflection surface of the first laser light source. Since a second laser light source that is integrally used and a second light receiving unit that integrally receives a second light receiving element that receives the return light reflected from the optical disc and transmitted through the polarization reflection surface are provided, In the optical pickup device, it is possible to record and reproduce only by selecting a laser light source on the wavelength side suitable for the optical disc to be used, and
Since the S-polarized light component and the P-polarized light component in which the polarization planes of the first and second laser light sources are orthogonal to each other and the polarization beam splitter are used, there is little loss in the polarization beam splitter and the light utilization efficiency is high. The wavelength plate can function as an optical isolator.
And uses the first laser light source of the first light source unit
In that case, the second light receiving element of the second light source unit is used.
And the second laser light source of the second light source unit
When using the first light receiving element of the first light source unit
It will be used, and in any case
The amount of signal from the optical disc is increased by reducing the return light to the optical disc.
It can be made to have an advantageous configuration that can be added .

According to the second aspect of the present invention, the polarization plane of the polarization beam splitter is used so that the polarization plane of the emitted light emitted from the first and second laser light sources can obtain a desired detection output to the monitor light receiving element. Since it is arranged so as to rotate by a predetermined angle so as not to be completely reflected or completely transmitted with respect to the surface, it is possible to share one monitor light receiving element without deteriorating the selectivity of the laser light source. , 2 of the laser light sources can be properly controlled.

[0037]

According to the third aspect of the present invention, one wavelength plate can be efficiently shared by the emitted lights of different wavelengths emitted from the first and second laser light sources.

According to the fourth aspect of the present invention, regarding the first and second light source units, the emission characteristics from the laser light source toward the optical disc side are not impaired, and the reflected light from the optical disc side is received. It does not impair the light condensing characteristics for the element.

According to the fifth aspect of the present invention, with respect to an optical component such as a collimator lens configured according to the wavelength specification of the light emitted from one laser light source, the light emitted from the other laser light source having a different wavelength is incident. Aberrations associated therewith are corrected when entering the corresponding grating for the light-receiving element, so that a normal light-receiving detection operation can be performed.

[0041]

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an optical pickup device according to a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional configuration diagram showing the configuration of the light source unit.

FIG. 3 is a principle diagram schematically showing reflection and transmission characteristics of S-polarized light and P-polarized light.

FIG. 4 is a schematic configuration diagram equivalently showing a usage state of each wavelength.

FIG. 5 is an explanatory diagram for explaining a relationship between a collimator lens and a light receiving element grating.

FIG. 6 is a characteristic diagram showing the relationship between the groove depth of the grating and the extinction ratio.

FIG. 7 is a schematic configuration diagram showing an optical pickup device according to a second embodiment of the present invention.

FIG. 8 is a schematic configuration diagram showing a conventional optical pickup device.

[Explanation of symbols]

11 optical disc 12 Objective lens 13 Optical parts 14 Wave plate 15 Polarizing beam splitter 15a Polarized reflection surface 16 First light source unit 17 Second light source unit 18 First laser light source 19 First light receiving element 20 Grating for light source 21 Grating for photo detector 22 Second laser light source 23 Second light receiving element 24 Light source grating 25 Grating for photo detector 26 Photodetector for monitor

Claims (5)

(57) [Claims] 1. An objective lens facing an optical disc, a polarization beam splitter disposed on the optical axis of the objective lens and having a polarization reflection surface, and light between the objective lens and the polarization beam splitter.
From a wavelength plate disposed on the axis, a first laser light source in which the orientation of the polarization plane of outgoing light is set so that the laser light of the S-polarized component is incident on the reflection side of the polarization reflection surface, and the optical disc. A first light source unit integrally having a first light receiving element for receiving the return light reflected and reflected by the polarization reflection surface, and a laser beam of a P polarization component is incident on the transmission side of the polarization reflection surface. The orientation of the plane of polarization of the emitted light is set to
A second laser light source that is alternatively used at a wavelength different from the wavelength of the laser light of the laser light source, and a second light receiving element that receives the return light reflected from the optical disc and transmitted through the polarization reflection surface. A second light source unit integrally provided,
The Bei example, without the first light source and the second light receiving element and the pair, before
An optical pickup device in which a second light source and the first light receiving element are paired . 2. The light emitted from the first laser light source is
Note that the polarized light reflection surface does not completely reflect light, and
The light emitted from the laser light source is not completely transmitted by the polarized reflection surface.
So that the polarization direction of the polarized reflection surface is
The polarization plane of the light emitted from the first laser light source and the second laser
Laser light emitted from the laser light source has a predetermined angle with the plane of polarization.
The polarized light is rotatably arranged and is included in the light emitted from the first laser light source.
Part of the emitted light that is transmitted without being completely reflected by the reflecting surface is received.
Light emitting position and light emitted from the second laser light source
Before being reflected without being completely transmitted by the polarized reflection surface
Serial outgoing light optical pickup apparatus part is disposed at a position for receiving the first laser light source and the second of claim 1, wherein the Ru a monitor light receiving element which is shared by the laser light source. Wherein the wave plate is a first intermediate optical pickup apparatus according to claim 1 or 2, wherein the wavelength specification of the wavelength of the emitted light wavelength and the second light source of the light emitted from the light source. 4. The first and second light source units each include the self-unit side light source in an area through which the emitted light from the mounted self-unit side light source passes and the return light reflected from the optical disc side does not pass. A light source grating formed to the wavelength specification of the emitted light from the light source, and a light receiving element grating formed to the wavelength specification of the light emitted from the other unit side light source paired to guide the return light to the light receiving element mounted The optical pickup device according to claim 1, further comprising: 5. An optical component formed on a common optical path in accordance with a wavelength specification of light emitted from the first or second laser light source, and the optical component on the side not conforming to the wavelength specification of the optical component. The light-receiving element grating for the second or first light-receiving element has a shape that corrects the aberration of the optical component associated with the wavelength of light emitted from the second or first laser light source for the light-receiving element. 4. The optical pickup device described in 4 .