JP2003272179A - Method for adjusting photodetector attachment position of optical pickup device and its manufacturing method, device for adjusting photodetector attachment position, and optical pickup device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently adjust the attachment position of a photodetector in an optical pickup device having the photodetector wherein a plurality of photodetecting parts individually receiving each return light emitted from a plurality of light sources and reflected by an optical recording medium, are formed on a same substrate. <P>SOLUTION: The attachment position of the photodetector is vertically/horizontally adjusted so that an optical beam spot of the return light for DVD comes to almost the center of a photodetecting part 18b1 for DVD. The optical output balance of the light beam spot of a return light for CD is detected by a photodetecting part 18a1 for CD in the above state to obtain the tilt (θ) of the attachment direction of the photodetector with respect to each optical beam spot, then the attachment direction of the photodetector is rotated in the direction to correct the obtained tilt (θ). After that, the attachment position of the photodetector is vertically/horizontally adjusted again so that the optical beam spot of the return light for DVD comes to almost the center of the photodetecting part 18b1 for DVD. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to, for example, a CD and a DV.
In an optical pickup device including a plurality of light sources that emit light having different wavelengths corresponding to different types of optical recording media such as D and a plurality of light receiving units corresponding to each optical recording medium, a plurality of light receiving units are provided. The present invention relates to an adjusting method and a manufacturing method of an optical pickup device, an adjusting device and an optical pickup device, which are capable of efficiently adjusting a mounting position of a photodetector formed on the same substrate.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open No. 2000-207766 discloses a plurality of light sources having different wavelengths and a plurality of light receiving portion patterns for individually receiving respective return lights emitted from the plurality of light sources and reflected by an optical recording medium. An optical pickup device including a photodetector formed on the same substrate and an optical system sharing an optical path from a plurality of light sources to the photodetector, and an optical recording / reproducing device including the same are described.

In the above-mentioned publication, a plurality of light receiving part patterns are formed on the same substrate, and each light receiving part pattern has a highly accurate relative position accuracy, so that the wavelengths emitted from a plurality of light sources are different. It is possible to guide each return light reflected by the optical recording medium to the light receiving portion pattern with high accuracy, and it is possible to obtain a high quality reproduction signal or recording signal for different types of optical recording media. It is stated that there is. Further, the above-mentioned publication describes that if a plurality of light sources are formed on the same semiconductor substrate, the intervals between the light sources can be positioned with high accuracy.

[0004]

Such an optical pickup device includes, for example, an aluminum die cast optical base (housing: housing), a two-wavelength semiconductor laser, a photodetector (photodiode integrated circuit: PD-IC), and It is manufactured by attaching various members constituting an optical system. At this time, it is necessary to adjust the mounting positions of the two-wavelength semiconductor laser that is the light source, the photodetector that is the light receiving section, and various optical system parts.

Particularly, when mounting the photodetector which is the light receiving part, in a state where the light receiving part mounting plate on which the photodetector is mounted (photodetector mounting plate) is brought into contact with the light receiving part mounting surface of the optical base. , Return light from each optical recording medium (read light, reflected light)
The position of the light-receiving part mounting plate is adjusted so that the spot of is imaged on each light-receiving part corresponding to each optical recording medium, and when the position adjustment is completed, the light-receiving part mounting plate is attached to the optical base by, for example, bonding. Fix it.

Here, in the adjustment of the mounting position of the photodetector in which the light receiving portions of the two systems are formed on the same substrate, one of the light receiving portions of the photodetector is made so that the return light from one optical recording medium enters the light receiving portion. Even if the position is adjusted, the return light from the other optical recording medium may not be properly incident on the other light receiving unit.

Therefore, it is necessary to adjust the mounting position of the photodetector in two directions, X and Y, which are orthogonal to the optical axis, and the direction of the photodetector in the rotation direction (θ direction). It takes time to adjust the mounting position. Therefore,
It is desired to detect the deviation of the mounting direction of the photodetector and correct the direction so that the mounting position of the photodetector can be adjusted efficiently.

The present invention has been made to solve the above problems, and is a method for adjusting a photodetector mounting position and a manufacturing method for an optical pickup device, which enables efficient adjustment of the mounting position of a photodetector. Photodetector mounting position adjustment device,
Another object of the present invention is to provide an optical pickup device.

[0009]

The above object is to separately receive a plurality of light sources that emit light of different wavelengths and return lights of the lights emitted from the plurality of light sources that are reflected by an optical recording medium. A method for adjusting a photodetector mounting position of an optical pickup device, the method comprising: adjusting a mounting position of the photodetector of an optical pickup device having a plurality of light receiving parts formed on the same substrate. An optical pickup characterized by detecting the respective light output balances of the light receiving section to obtain the positional deviation of the photodetector in the rotational direction, and correcting the mounting position of the photodetector based on the positional deviation in the rotational direction. This is achieved by the method for adjusting the photodetector mounting position of the device.

In the method of adjusting the photodetector mounting position of the optical pickup device of the present invention, the plurality of light sources are arranged on the same substrate.

In the photodetector mounting position adjusting method for the optical pickup device of the present invention, the plurality of light sources are two, and the plurality of light receiving part patterns are two.

In the method for adjusting the photodetector mounting position of the optical pickup device according to the present invention, one light output balance of the light receiving portion is detected, and one light spot of the return light is substantially equal to the one light receiving portion. The mounting position of the photodetector is adjusted so that the light is received at the center, and the light output balance of the other light receiving unit that receives the other light spot of the return light is detected to detect the rotation direction of the photodetector. It is characterized in that the positional deviation is obtained and the mounting position of the photodetector is corrected based on the positional deviation in the rotation direction.

In the method for adjusting the photodetector mounting position of the optical pickup device of the present invention, the mounting position of the photodetector is such that one light spot of the return light is received at substantially the center of one of the light receiving portions. And adjusting the mounting position of the photodetector so that the other light spot of the return light is received at the other substantially center of the light receiving unit, and based on the previous adjustment position and the next adjustment position. A positional deviation of the photodetector in the rotation direction is obtained, and the mounting position of the photodetector is corrected based on the positional deviation in the rotation direction.

In the method for adjusting the photodetector mounting position of the optical pickup device according to the present invention, one light spot of the return light can be received by one of the light receiving portions, and the other light spot of the return light is by the above. Rotation of the photodetector by adjusting the mounting position of the photodetector so that the other photodetector can receive light, and detecting the optical output balance of the one photodetector and the optical output balance of the other photodetector. It is characterized in that the positional deviation in the direction is obtained, and the mounting position of the photodetector is corrected based on the positional deviation in the rotation direction.

Further, the above object is to provide a plurality of light sources for emitting lights having different wavelengths and a plurality of light receiving devices for individually receiving the respective return lights of the lights emitted from the plurality of light sources reflected by the optical recording medium. A method of manufacturing an optical pickup device having a photodetector in which a portion is formed on the same substrate, wherein a photodetector mounting position adjusting step of adjusting a mounting position of the photodetector,
This is achieved by a method for manufacturing an optical pickup device, which is characterized by using the above-described photodetector mounting position adjusting method of the present invention.

Further, the above object is to provide a plurality of light sources for emitting lights having different wavelengths and a plurality of light receiving devices for individually receiving the respective return lights reflected by the optical recording medium. A photodetector mounting position adjusting device for adjusting a mounting position of the photodetector of an optical pickup device having a photodetector having a portion formed on the same substrate, wherein the photodetector is mounted. An engagement portion that engages with the attachment plate; a attachment position adjustment mechanism that adjusts the attachment position of the photodetector by moving the position of the engagement portion and rotating the orientation of the engagement portion; The light output balances of the light spots received by the plurality of light receiving units are detected to obtain the positional deviation in the rotation direction of the photodetector, and the mounting position adjusting mechanism is driven based on the positional deviation in the rotation direction. To correct the mounting position of the photodetector It is achieved by an optical detector installation position adjusting apparatus for an optical pickup device characterized by comprising an urging position adjustment control unit.

Further, the above object is to provide a plurality of light sources for emitting lights having different wavelengths, and a plurality of light receiving portions for individually receiving the respective return lights reflected by the optical recording medium from the lights emitted from the plurality of light sources. And a photodetector mounting plate provided with an adjusting mechanism for adjusting the mounting position of the photodetector.

In the optical pickup device of the present invention, the plurality of light sources are arranged on the same substrate.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A photodetector mounting position adjusting method and manufacturing method for an optical pickup device, a photodetector mounting position adjusting device, and an optical pickup device according to an embodiment of the present invention will be described with reference to FIGS. Explain. FIG. 1 is a schematic structural diagram of the optical pickup device according to the present embodiment. The optical pickup device 10 according to the present embodiment is
Various compact discs (CD) including CD-R 1
a and various digital versatile discs (D
Vd-ROM, DVD-RAM, etc.) 1b and other types of optical recording media can be supported. The optical pickup device 10 includes a two-wavelength semiconductor laser (laser diode: LD) 11, a retardation plate 12, and diffraction gratings 13a and 13b sequentially arranged from the two-wavelength semiconductor laser 11 side.
, Beam splitter 14, collimator lens 15
And a raising mirror (not shown) and the objective lens 16
And a photodetector (P
D-IC: photodiode integrated circuit) 18.

The two-wavelength semiconductor laser 11 includes a laser beam having a wavelength of 785 nm for reproducing a CD and a wavelength 655 for reproducing a DVD.
The laser beam of nm is output. This dual wavelength semiconductor laser 1
The optical output of 1 is a reproduction class (for example, 5 mW). In this two-wavelength semiconductor laser 11, a semiconductor substrate (semiconductor laser body) is sealed in a housing (case) made of metal or the like, and each laser beam is emitted from a laser window portion provided in the housing. There is. A back monitor (not shown) detects the light output amount of the two-wavelength semiconductor laser 11 to detect the two-wavelength semiconductor laser 1
The amount of light output is automatically controlled (APC: automatic power control) by feedback-controlling the electric power supplied to unit 1.

FIG. 2 is a perspective view showing a schematic structure of a two-wavelength semiconductor laser 11 which constitutes a light source. FIG. 2 shows only the main body of the semiconductor laser, excluding the casing that seals the semiconductor substrate. The semiconductor laser 11 includes, for example, a gallium arsenide (GaAs) semiconductor substrate 11a, an optical waveguide (first optical waveguide) 11b for a wavelength of 785 nm, and a wavelength of 655 nm.
The optical waveguides (second optical waveguides) 11c are formed at a predetermined interval (for example, 110 μm), and the ends of the optical waveguides are the light emitting points 11d and 11e. Laser light having a wavelength of 785 nm is emitted from the first emission point (CD emission point) 11d, and the second emission point (DVD emission point) 11e.
Emits a laser beam having a wavelength of 655 nm. Code L
A is the distance between the light emitting points of the two light sources. Semiconductor laser 1
Since 1 is manufactured by the photolithography process, the interval L
A is formed with high precision and has few errors.

The laser light emitted from each of the light emitting points 11d and 11e is emitted to the outside of the housing through a laser window formed in the housing (not shown). The two-wavelength semiconductor laser 11 oscillates a laser beam with a wavelength of 655 nm (for DVD) in a self-excited oscillation mode and a laser beam with a wavelength of 785 nm (for CD) in a gain-guided multimode. The two-wavelength semiconductor laser 11 may be one that oscillates laser light of each wavelength in a single mode.

The phase difference plate 12 shown in FIG. 1 is a quarter-wave plate, and the phase difference plate 12 converts a linearly polarized light beam into circularly polarized light. Generally, circularly polarized light is desirable for high-speed DVD reproduction. In this embodiment, as the retardation plate 12, a thin glass plate having a functional film attached is used. The retardation plate 12 is installed so that its optical axis is inclined by 45 degrees with respect to the plane of polarization of linearly polarized light.

The diffraction grating 13a is, for example, the semiconductor laser 1
The grating surface for DVD is formed on the surface on the 1st side, and the diffraction grating 13
In b, a CD grating surface is formed on the surface on the beam splitter 14 side. The split light amount ratio in the diffraction gratings 13a and 13b is, for example, 1 (+ 1st order light) for both DVD and CD:
6 (0th order light): 1 (-1st order light). The grid pitch is
For example, 21.2 μm on the DVD side and 31.0 μm on the CD side
Is. The DVD grating surface should not diffract at the CD wavelength (785 nm), and the CD grating surface should be at the DVD wavelength (65 nm).
5 nm) has wavelength selectivity so as not to diffract. This exclusive action (wavelength selectivity) is realized by making the groove depth deeper than that of an ordinary diffraction grating and by adopting a grating shape in which the duty ratio of the grating interval is deviated from 0.5.

The beam splitter 14 is the semiconductor laser 1
It has the function of a half mirror that reflects the light beam from the first side toward the optical recording medium and transmits the reflected light from the optical recording medium toward the photodetector 18 side. In this embodiment, a flat beam splitter plate (BS plate) is used.

The collimator lens 15 converts the bundle of divergent rays from the semiconductor laser 11 which is a light source into a bundle of parallel rays and guides it to the objective lens 16, and also converts the bundle of parallel rays from the objective lens 16 into a bundle of focused rays. It leads to the photodetector 18. In the present embodiment, a collimator lens whose both surfaces are aspherical and is formed by plastic injection molding is used.

The raising mirror (not shown) reflects the parallel light flux from the collimator lens 15 toward the objective lens 16 and reflects the parallel light flux from the objective lens 16 toward the collimator lens 15 side. In this embodiment, a flat mirror is used as the rising mirror. The bending angle (reflection angle) is about 90 degrees.

FIG. 3 is a structural diagram of the objective lens.
3A shows a front view, and FIG. 3B shows a side view. In FIG. 3B, each disc (optical recording medium) 1
Side surfaces of a and 1b are also shown together. Note that FIG. 3 (b)
In the above, reference numeral Ka is an information recording surface of a compact disc (CD), and reference numeral Kb is an information recording surface of a DVD. Reference numeral ta is the thickness of the compact disc (CD) (ta = 1.
2 mm), symbol tb is the thickness of the DVD (tb = 0.6 m
m).

Optical pickup device 1 according to the present embodiment
In 0, a double focus diffraction type objective lens is used as the objective lens 16. This objective lens (double focus diffractive objective lens) 16 is manufactured by injection molding an optical plastic material. As shown in FIG. 3B, both surfaces of the objective lens 16 are formed as aspherical surfaces. As shown in FIG. 3A, a lens surface having a large curvature (on the rising mirror side,
That is, on the side opposite to the optical recording medium), a diffraction grating including a large number of concentric circular zones 16c having a sawtooth cross section is formed. A holographic diffraction grating may be formed on the lens surface instead of the diffraction grating. Concentric ring zone 16c
The area on the center side of the lens surface is a combined CD / DVD area 16a, and the area on the outer peripheral side thereof is an area 16b dedicated to DVD. The objective lens 16 focuses the light beam for CD (wavelength 785 nm) on the information recording surface Ka of the CD 1a, and D
A light beam for VD (wavelength 655 nm) is focused on the information recording surface Kb of the DVD 1b.

Each disc (optical recording medium) 1a, 1b is
The information recording surfaces Ka and Kb are protected by a protective film made of polycarbonate or the like. The thickness of the protective film (corresponding to the thickness of the optical recording medium) varies depending on the type of the optical recording medium. Since the spherical aberration of incident light changes depending on the thickness of the protective film,
The amount of spherical aberration also differs depending on the type of optical recording medium. Therefore, the double focus diffraction objective lens 16 is used to correct the difference in spherical aberration due to the type of the optical recording medium.

The objective lens 16 is held on an actuator assembly (actuator assembly) (not shown) so as to be movable in the focus direction and the tracking direction (radial direction of the optical recording medium). Then, the position of the objective lens 16 is controlled by the focus servo control and the tracking servo control, and the spot of the light beam can be made to follow the reading point on the optical recording medium.

As shown in FIG. 1, a two-wavelength semiconductor laser 1
The linearly polarized light beam (laser light) emitted from 1 is
After the polarization direction is changed by the phase difference plate 12, the light is sequentially incident on the diffraction gratings 13a and 13b, two sub-beams for tracking (+ 1st order light, -1st order light) and a main beam for RF detection and focusing (0 Next light) is beam splitter 1
It is incident on 4. The light beams of about half the amount of light of each of the main beam and each of the sub-beams that have entered the beam splitter 14 are reflected by the beam splitter 14, the traveling direction thereof is bent by 90 degrees, and emitted to the collimator lens 15 side. The main beam and each sub-beam incident on the collimator lens 15 are divergent ray bundles.

The photodetector (PD-IC) 18 is a light receiving portion 18a for reflected light (for CD) from the compact disc 1a.
And a light receiving section 18 for reflected light (for DVD) from the DVD 1b
and b. Reference numeral LB in the drawing denotes each light receiving portion 18a,
The interval of 18b is shown. The photodetector 18 receives a main beam and a sub beam, respectively, and converts them into current signals corresponding to the main beam and the sub beam, respectively, and a current generated in the light receiving unit (PD: photodiode part or photo detect part). Various signals (reproduced signal (R
F signal), focus error signal (FES), tracking error signal, and the like). In the present embodiment, the light receiving section and the arithmetic section (IC section) are constituted by a monolithic IC, and this monolithic IC is enclosed in, for example, a 14-pin COB (chip on board) package.

FIG. 4 shows a light receiving element pattern configuration of the light receiving portion of the photodetector. Reference numeral LB in FIG. 4 indicates the distance between the center point of the CD light receiving portion 18a and the center point of the DVD light receiving portion 18b. The CD light receiving portion 18a includes a main beam light receiving element pattern portion 18a1, a first sub beam light receiving element pattern portion 18a2, and a second sub beam light receiving element pattern portion 18a3. The main beam light receiving element pattern portion 18a1 has four main beam light receiving element patterns A, B, C and D divided into four in a square shape.

The first sub-beam light-receiving element pattern portion 18a2 of the CD light-receiving portion 18a has sub-beam light-receiving element patterns E1 and E2 which are vertically divided into two parts. The area of the sub beam light receiving element pattern E1 on the side closer to the main beam light receiving element pattern portion 18a1 is set larger than that of the sub beam light receiving element pattern E2 on the far side. This first sub-beam light receiving element pattern portion 1
8a2 is arranged to be slightly displaced to the left in the drawing with respect to the main beam light receiving element pattern portion 18a1.

The second sub-beam light-receiving element pattern portion 18a3 of the CD light-receiving portion 18a has sub-beam light-receiving element patterns F1 and F2 which are vertically divided into two. The sub beam light receiving element pattern F2 on the side closer to the main beam light receiving element pattern portion 18a1 has a larger area than the sub beam light receiving element pattern F2 on the far side. This second sub-beam receiving element pattern portion 1
8a3 is arranged slightly offset to the right in the figure with respect to the main beam light receiving element pattern portion 18a1. In the present embodiment, the division interval of each light receiving element pattern in each light receiving element pattern portion is about 4 μm.

The DVD light receiving portion 18b includes a main beam light receiving element pattern portion 18b1, a first sub beam light receiving element pattern portion 18b2, and a second sub beam light receiving element pattern portion 18b3. The main beam light receiving element pattern portion 18b1 has four main beam light receiving element patterns a, b, c, d which are divided into four in a square shape.

The first sub-beam light-receiving element pattern portion 18b2 of the DVD light-receiving portion 18b has four sub-beam light-receiving element patterns e1, e2, e which are divided into four in a square shape.
3 and e4. The first sub-beam light-receiving element pattern portion 18b2 is arranged slightly offset to the left in the figure with respect to the main beam light-receiving element pattern portion 18b1. Second sub-beam light receiving element pattern portion 18b3
Has four sub-beam light receiving element patterns f1, f2, f3, f4 divided into four in the shape of a square. The second sub-beam light-receiving element pattern portion 18b3 is arranged slightly offset to the right in the figure with respect to the main beam light-receiving element pattern portion 18b1. In the present embodiment, the division interval of each light receiving element pattern in each light receiving element pattern portion is about 4 μm.

Further, the main beam light receiving element pattern portion 18b1 of the DVD light receiving portion 18b is the CD light receiving portion 18b.
The main beam light receiving element pattern portion 18a1 of a1 is arranged so as to be slightly shifted downward in the drawing.

FIG. 5 is an explanatory diagram of the operation mode of the photodetector (PD-IC) 18. FIG. 5 shows types of optical recording media (discs) (DVD-ROM, DVD-RAM, CD-ROM).
And the three categories of CD-RW), the light receiving element used for reproduction, and the focus error detection method and the tracking error detection method. In addition,
In FIG. 5, the light receiving elements used for reproduction are indicated by adding circles representing the light beam spots.

When reproducing a DVD-ROM, a DVD
Main beam receiving element patterns a, b, c,
Only d is used. Focus error detection (FES) is performed using the astigmatism method. Each light receiving element pattern a, b,
If the outputs of c and d are Va, Vb, Vc, and Vd, respectively, the focus error detection output FES by the astigmatism method is expressed by the following equation. FES = (Va + Vc)-(Vb + Vd)

In reproducing the DVD-ROM, the tracking error detection (RES) is performed by using the phase difference method. The phase difference method detects a tracking error by utilizing that the phase modulation can be detected in addition to the amplitude modulation by the pit when the track shift occurs. If only the DVD-ROM is reproduced, the sub-beam is not necessary, so the diffraction grating 13
a and 13b are unnecessary.

When reproducing a DVD-RAM, a DVD
Use all the light receiving element patterns of the light receiving section. Focus error detection (FES) is performed using the differential astigmatism method. In the DVD-RAM, the land and the groove formed on the disk surface have the same width, and a groove crossing noise is generated in the normal astigmatism method. Since this groove crossing noise has the opposite phase between the main beam and the sub beam, the groove crossing noise can be removed by adding the detection output by the main beam and the detection output by the sub beam. Therefore, astigmatism detection is performed using both the main beam and the sub beam. The outputs of the respective light receiving element patterns a to d, e1 to e4, f1 to f4 are respectively Va to Vd, Ve1 to Ve4 and Vf1 to V.
If f4, the focus error detection output DAD-FES by the differential astigmatism method (DAD) is expressed by the following equation. In the following equation, k is a coefficient. DAD-FES = {(Va + Vc)-(Vb + Vd)}
+ K {(Vf1 + Vf3 + Ve1 + Ve3)-(Vf2
+ Vf4 + Ve2 + Ve4)}

The tracking error (RES) is detected by the differential push-pull method when reproducing the DVD-RAM. Since the DVD-RAM has a land-groove structure, the 3-beam method cannot be applied. Further, the DVD-RAM requires push-pull output in order to reproduce the address information (CAPA) recorded by the zigzag embossed pits. On the other hand, the simple push-pull method is easy to adjust because the tracking error is detected only by the main beam, but the radial shift characteristic is poor. The differential push-pull method (DPP) vertically inverts the sub-beam push-pull output waveform to generate two in-phase signals even when the main-beam push-pull output and the sub-beam push-pull output cause an offset in the radial shift. By adding,
A good tracking error output with an improved radial shift characteristic is obtained. In this differential push-pull method, it is a precondition that each sub-beam is deviated from the main beam by 1/2 cycle of one track cycle.

When reproducing a CD-ROM and a CD-RW, the light receiving element patterns A, B, and
C, D, E1, E2, F1 and F2 are used. Focus error detection (FES) is performed using the astigmatism method. The output of each light receiving element pattern A, B, C, D is VA,
Assuming VB, VC, and VD, the focus error detection output FES by the astigmatism method is expressed by the following equation. FES = (VA + VC)-(VB + VD)

Tracking error detection (RES) at the time of reproducing the CD-ROM and the CD-RW is performed by using the three-beam method. The three-beam method is widely used as a CD (compact disc) tracking detection method.
The sub-beams are arranged so as to be offset from the main track by 1/4 pitch of the track pitch. Assuming that the outputs of the respective light receiving element patterns E1, E2, F1, F2 are VE1, VE2, VF1, VF2, the tracking error detection output (RES) by the 3-beam method is expressed by the following equation. FES = (VE1 + VE2)-(VF1 + VF2)

In the three-beam method, the light receiving element pattern portion of the first sub-beam does not have to be divided into two sub-beam light receiving element patterns E1 and E2. The sub beam light receiving element patterns F1 and F2 may not be divided into two.

The collimator lens 15 converts the light beam (divergent ray bundle) incident from the beam splitter 14 side into a parallel ray bundle. The light beam (parallel light flux) emitted from the collimator lens 15 is directed to the optical recording medium (each disc 1 by a raising mirror not shown).
a, 1b) is changed to a direction substantially orthogonal to the disc surface (recording surface) and is incident on the objective lens 16,
At 6, the light beam becomes a focused light beam, and the information recording surface of each of the optical recording media 1a and 1b is irradiated as spot light.

The reflected light reflected by each disk (optical recording medium) 1a, 1b reaches the beam splitter 14 in the order of the objective lens 16, the raising mirror (not shown), and the collimator lens 15, and the amount of light is about half. Is the beam splitter 14
Through. The light transmitted through the beam splitter 14 reaches the photodetector 18, and is converted into an electric signal by the photodetector 18.

FIG. 6 is a schematic structural diagram of another optical pickup device according to the present embodiment. The optical pickup device 20 shown in FIG. 6 has a predetermined optical axis of the light beam emitted from the two-wavelength semiconductor laser 21 in a direction orthogonal to the optical axis of the reflected light from the objective lens 26 to the photodetector 28. By tilting the angle, the size of the optical pickup device 20 in the width direction (direction orthogonal to the optical axis of the optical system on the reflected light side) is reduced, and the optical pickup device 20 is further downsized.

The structure and operation of the optical pickup device 20 are basically the same as those of the optical pickup device 10 shown in FIG. Note that FIG. 6 shows an example in which the phase difference plate 22 is tilted to prevent the laser light emitted from the two-wavelength semiconductor laser 21 from being reflected by the phase difference plate 22 and returning to the laser 21. Reference numeral 21a is a laser window through which laser light is emitted. Reference numeral LA is the interval between the first light emitting point 21d and the second light emitting point 21e. Reference numeral LB is an interval between the respective light receiving units.

In this optical pickup device 20, a parallel plate-shaped base material is used as the beam splitter 24. A half mirror film is formed on one surface (the surface on the side of the two-wavelength semiconductor laser 21) 24a of the beam splitter 24. Further, a harmful light antireflection film is formed on the other surface (surface on the photodetector 28 side) 24b of the beam splitter plate 24.

The light beam emitted from the two-wavelength semiconductor laser 21 is incident on one surface 24a of the beam splitter 24 through the phase difference plate 22 and the diffraction gratings 23a and 23b.
A part is reflected by the beam splitter 24. The light beam reflected by the beam splitter plate 24 is reflected by the collimator lens 2
It is converted into a parallel ray bundle by 5 and a rising mirror (not shown)
It is bent by the objective lens (2
It is focused by a double-focus diffractive objective lens) 26 and is irradiated as an optical spot on an information recording surface of an optical recording medium (not shown).

The reflected light beam reflected by the optical recording medium (not shown), the objective lens 26, the raising mirror (not shown),
Beam splitter 24 via collimator lens 25
And part of the light passes through the beam splitter 24. The reflected light beam that has passed through the beam splitter 24 is incident on the light receiving portions 28a and 28b of the photodetector 28, and
The reflected light beam intensity is detected by a and 28b.

The optical pickup devices 10 and 20 shown in FIG. 1 and FIG. 6 have a two-wavelength semiconductor lasers 11 and 21 as a light source on an optical base (housing: housing) (not shown).
Retardation plates 12, 22 and diffraction gratings 13a, 13b, 23
a, 23b, beam splitters 14, 24, collimator lenses 15, 25, a rising mirror (not shown), objective lenses 16, 26, photodetector mounting plate 17,
It is manufactured by attaching the photodetectors 18 and 28 attached to 27.

FIG. 7 is a perspective view showing an example of a method for adjusting the mounting position of the photodetector, FIG. 8 is a view showing an example of the structure of the mounting portion of the photodetector, and FIG. 8A is a plan view. 8B is a side view, FIG. 8C is a diagram showing a mounting structure of the photodetector on the photodetector mounting plate, and FIG. 9 is a block configuration diagram of the photodetector mounting position adjusting device according to the present embodiment. Is.

As shown in FIG. 8C, the photodetector assembly in which the flexible wiring board (FPC) 42 is connected to the substrate (COB substrate) 41 on which the photodetector 18 is mounted is attached to the photodetector mounting plate 17. It is installed. Each terminal (not shown) of the photodetector 18 is electrically connected to each terminal (not shown) of the COB substrate 41. Then, the COB substrate 41
Of each terminal (not shown) and each terminal (not shown) provided on the flexible wiring board 42 are electrically connected. As a result, the photodetection output signal of each light receiving element pattern portion of the photodetector 18 is extracted to the outside via the flexible wiring board 42.

As shown in FIG. 8B, the photodetector mounting plate 17 is provided with holes 17a and 17b at at least two positions. In the present embodiment, the first hole 17a is formed at a position corresponding to the center position (designed center position) of each of the light receiving portions 18a and 18b, and the second hole 17b is formed at the corner of the photodetector mounting plate 17. Formed on the part. In addition, each hole 17a, 17b
May be a hole-shaped groove instead of a so-called through hole penetrating the photodetector mounting plate 17. Further, a convex portion may be provided instead of the hole. Further, a hole or a convex portion is provided at one place, and for example, U is provided on the side of the photodetector mounting plate 17.
You may make it provide a V-shaped notch part. In addition, in the present embodiment, the first hole 17a is formed in each light receiving portion 18a.
Although it is provided at the center position of a and 18b, it is not always necessary for each light receiving unit 1
It is not necessary to provide it in the central position of 8a, 18b. Hole, groove,
A cut-and-raised portion may be provided instead of the cutout portion or the like.

As shown in FIG. 8A, the left and right ends of the photodetector mounting plate 17 on which the photodetector 18 is mounted are brought into contact with the side end surfaces of the mounting portions 19L and 19R of the optical base (housing: housing). In the contact state, the mounting position of the photodetector 18 is adjusted by adjusting the position of the photodetector mounting plate 17. Then, after the adjustment of the mounting position is completed, in the present embodiment, the left and right side end surfaces of the photodetector mounting plate 17 and the respective mounting portions 19 are mounted.
The photodetector mounting plate 17 is fixed by applying an adhesive to the side end surfaces of L and 19R and each contact portion.

As shown in FIG. 7, the mounting position of the photodetector 18 is adjusted by adjusting the holes 17 formed in the photodetector mounting plate 17.
This is performed by using the position adjusting jig 32 having the engaging pins 31, 31 that engage with a and 17b. Specifically, the tip ends of the engagement pins 31, 31 are inserted into the holes 17a, 17b, and the photodetector attachment plate 17 is attached to the side end surfaces of the attachment portions 19L, 19R via the engagement pins 31, 31. Position adjustment jig 32 is moved in the X direction (left and right direction in the drawing) and Y direction (up and down direction in the drawing), and the position adjustment jig 32 is further moved in the θ direction (light detector The mounting position of the photodetector 18 is adjusted by rotating the photodetector 18 in the rotating direction.

As shown in FIG. 9, the photodetector mounting position adjusting device 30 has a mounting position adjusting jig provided with respective engaging pins 31, 31 which are engaging parts with the photodetector mounting plate 17 at predetermined positions. It has a tool 32, a mounting position adjusting mechanism 33 for moving and rotating the mounting position adjusting jig 32, and a mounting position adjusting control device 39.

The mounting position adjusting mechanism 33 includes a rotation driving mechanism 34 for rotating the mounting position adjusting jig 32, and a triaxial moving table 35 to which the rotation driving mechanism 34 is mounted.
And a horizontal drive mechanism 36 for moving the triaxial moving table 35 in the horizontal direction (horizontal direction: X direction) and a vertical driving mechanism 37 for driving the triaxial moving table 35 in the vertical direction (vertical direction: Y direction). And a longitudinal drive mechanism 38 for moving the triaxial movement table 35 in the longitudinal direction (Z direction). By moving the three-axis moving table 35 in the forward direction, the engaging pins 31, 31 attached to the tip end side of the attachment position adjusting jig 32 are attached to the photodetector 18 of the photodetector attaching plate 17.
Can be engaged with the holes 17a and 17b, which are a mechanism for adjusting the mounting position and direction of the. Further, by moving the triaxial moving table 35 backward, the engagement with the photodetector mounting plate 17 can be released.

The rotary drive mechanism 34 includes a stepping motor and a reduction gear mechanism (both not shown). The rotation driving mechanism 34 drives the stepping motor several steps to several tens steps to rotate the attachment position adjusting jig 32 once.

The mounting position adjustment control device 39 is used for the photodetector 1.
8, the deviation of the mounting position of the photodetector 18 and the deviation (tilt) of the mounting direction of the photodetector 18 with respect to each return light are obtained based on the respective detection outputs of the light receiving element pattern portions of 8, and the obtained deviation direction and deviation amount Based on each drive mechanism 34, 36, 37, 3
By adjusting the position and the direction (direction of the rotation direction) of the position adjusting jig 32 via 8, the light spot of the return light of each system is located at the substantially central position of each of the light receiving portions 18a and 18b of the photodetector 18. Automatically adjust to fit.

Next, a method for obtaining the displacement of the mounting position of the photodetector 18 and the displacement (tilt) of the mounting direction of the photodetector 18 will be described. FIG. 10 is an explanatory diagram showing an example of a method for detecting the mounting inclination (positional deviation of the mounting position in the rotation direction) of the photodetector with respect to the light beam spot of each return light. To detect the positional deviation of the photodetector 18 in the rotational direction with respect to the optical axis, the main beam light receiving element pattern portions 18a1 and 18a
It is performed using b1.

First, the four main beam light receiving element patterns of one of the main beam light receiving element pattern portions (here, the four main beam light receiving element patterns a and b of the main beam light receiving element pattern portion 18b1 of the DVD light receiving portion 18b). , C, d) optical outputs Ia, Ib, Ic, I
By detecting the light output balance of d, the light beam spot of the return light for DVD and the main beam light receiving element pattern portion 18b
The deviation from the center position of 1 is calculated.

Specifically, the sum (Ia +) of the optical outputs of the upper two main beam light receiving element patterns a, b among the four main beam light receiving element patterns a, b, c, d.
Ib) and the two main beam receiving element patterns c on the lower side,
Difference between the optical output of d (Ic + Id) and {(Ia + Ib)
− (Ic + Id)} is calculated. Calculated difference {(Ia + I
The direction and amount of deviation in the vertical direction (Y direction) can be known from the polarity and value of b)-(Ic + Id)}. Instead of obtaining the above difference, the sum (Ia + I) of the optical outputs of the upper two main beam receiving element patterns a and b is used.
b) and the two main beam receiving element patterns c and d on the lower side
The ratio to the sum (Ic + Id) of the optical outputs of 1 may be obtained. When the ratio is obtained, the direction of the deviation can be known based on whether the obtained ratio is 1 or more or 1 or less, and the deviation amount can be known based on the value of the obtained ratio.

Similarly, the sum (Ib + I) of the optical outputs of the two main beam receiving element patterns b, c on the right side of the main beam receiving element patterns a, b, c, d divided into four.
c) and two main beam light receiving element patterns a and d on the left side
Difference ((Ib + Ic) − from the sum of optical outputs of (Ia + Id))
(Ia + Id)} is calculated. The calculated difference of {(Ib + I
The direction and amount of deviation in the left-right direction (X direction) can be known from the polarity and value of c)-(Ia + Id)}. Instead of obtaining the above difference, the sum (Ib + I) of the optical outputs of the two right side main beam receiving element patterns a and b is used.
c) and two main beam light receiving element patterns c and d on the left side
The ratio with the sum (Ia + Id) of the optical outputs of 1 may be obtained. When the ratio is obtained, the direction of the deviation can be known based on whether the obtained ratio is 1 or more or 1 or less, and the deviation amount can be known based on the value of the obtained ratio.

When the deviation between the image forming position of the light beam spot of the return light for DVD and the central position of the main beam light receiving element pattern portion 18b1 is found, the mounting position of the photodetector 18 is set in the left-right direction so as to correct the deviation. (X direction) and vertical direction (Y direction). As a result, as shown by the phantom line in FIG. 10, the optical beam spot of the return light for DVD which is displaced from the center position of the main beam light receiving element pattern portion 18b1 has a center of 4 as shown by the solid line. Each of the divided main beam light receiving element patterns a, b, c, d comes to a substantially central position.

Next, with the mounting position of the photodetector 18 adjusted in the horizontal direction (X direction) and the vertical direction (Y direction), the main beam light receiving element pattern portion 18a1 of the CD light receiving portion 18a is adjusted. Of the four main beam light receiving element patterns A, B, C and D are detected.

As shown in FIG. 10, when the light beam spot of the return light for CD is deviated to the upper side of the light receiving element pattern portion 18a1, the light output of the upper two main beam light receiving element patterns A and B is obtained. Difference between the sum and the sum of the optical outputs of the two main beam receiving element patterns C and D on the lower side {(IA
+ IB)-(IC + ID)} is a positive value. From this, it can be seen that the mounting direction of the photodetector 18 is deviated in the clockwise direction (clockwise direction).

Here, the relationship between the deviation amount of the mounting angle of the photodetector 18 and the value of the difference {(IA + IB)-(IC + ID)} is obtained in advance, and the expression expressing the relationship is registered. From the difference {(IA + IB)-(IC + ID)}, the shift amount of the mounting angle of the photodetector 18 (angle to be corrected) can be calculated. Or photo detector 1
8 and the difference {(IA + IB)-(I
If the relationship with the value of (C + ID)} is stored as a table in, for example, a nonvolatile semiconductor memory or the like, the difference {(IA + IB)-(IC + I
D)}, the amount of deviation of the mounting angle of the photodetector 18 (angle to be corrected) can be obtained.

The difference {(IA + IB)-(IC +
ID)}, instead of the sum of the optical outputs of the two main beam receiving element patterns A and B on the upper side (IA + IB) and the sum of the optical outputs of the two main beam receiving element patterns C and D on the lower side (IC + ID). Ratio of {(IA + IB) / (IC + I
D)}, the mounting direction deviation direction and deviation amount (deviation angle) of the photodetector 18 may be obtained.

When the deviation direction and the deviation amount (deviation angle) of the mounting direction of the photodetector 18 are obtained, the mounting direction of the photodetector 18 is adjusted so as to correct the deviation amount. After that, the four main beam light receiving element patterns (here, DVD
Main beam light receiving element pattern portion 18 of the light receiving portion 18b for
4 main beam light receiving element patterns a, b, b1
The position of the photodetector 18 is detected so that the balance of the optical outputs Ia, Ib, Ic, and Id of (c, d) is detected, and the optical beam spot of the return light for DVD comes to the center position of the main beam light receiving element pattern portion 18b1. Is adjusted in the horizontal direction (X direction) and the vertical direction (Y direction). As a result, the light beam spot of the return light for DVD is located substantially at the center position of the main beam light receiving element pattern portion 18b1, and the light beam spot of the return light for CD is located at the substantially center position of the main beam light receiving element pattern portion 18a1. Is adjusted to come to.

The adjustment of the mounting position of the photodetector is performed by using the photodetector mounting position adjusting device 30 shown in FIG. 9 to attach the optical pickup devices 10 and 20 to an optical pickup device mounting jig (not shown). Attach it to At this time, return light is generated using a test optical disk. In this test optical disc, the reading light for CD is reflected at a position corresponding to the information recording surface for CD, and the returning light for CD is generated.
The reading light for VD is reflected at a position corresponding to the information recording surface for DVD to generate return light for DVD.

It should be noted that the mounting position of the photodetector 18 may be manually adjusted without using the photodetector mounting position adjusting device 30 shown in FIG. In this case, each main beam light receiving element pattern portion 1 is displayed on the screen of the image display device.
While displaying the shape of 8a1, 18b1, the position of the light beam spot of each return light obtained based on each photodetection output Ia ~ Id, IA ~ ID of each main beam light receiving element pattern portion 18a1, 18b1 is displayed, Further, the direction and amount of movement of the photodetector 18 or the photodetector mounting plate 17, and the rotation direction and rotation angle are displayed. The moving direction may be displayed on the screen with an arrow or the like, and the length of the arrow may express the moving amount. Similarly, the rotation direction may be indicated by an arrow, and the angle of rotation may be expressed by the length or thickness of the arrow.

In FIG. 10, after the mounting position of the photodetector 18 is adjusted so that the light beam spot of the return light for DVD is at the center of the main beam light receiving element pattern 18b1 of the light receiving portion 18b for DVD, the light receiving portion for CD is adjusted. The light output balance of the main beam light receiving element pattern 18a1 of 18a is detected, and the photodetector 18 is detected based on the detected light output balance.
The method for detecting the mounting tilt of the CD and correcting the tilt has been described, but the light beam spot of the return light for the CD is the light receiving portion 1 for the CD.
After adjusting the mounting position of the photodetector 18 so as to come to the center of the main beam light receiving element pattern 18a1 of 8a, D
Main beam light receiving element pattern 1 of VD light receiving portion 18b
The light output balance of 8b1 may be detected, the mounting inclination of the photodetector 18 may be detected based on the detected light output balance, and the inclination may be corrected.

FIG. 11 is an explanatory view showing another example of the method for detecting the mounting inclination (positional deviation of the mounting position in the rotational direction) of the photodetector with respect to the light beam spot of each return light. First, as shown in FIG. 11A, the position of the photodetector 18 is adjusted so that the light beam spot of the return light for DVD is substantially in the center of the main beam light receiving element pattern portion 18b1 for DVD. In addition, here, the sum (Ia +) of the optical outputs of the upper two main beam light receiving element patterns a, b among the four main beam light receiving element patterns a, b, c, d.
Ib) and the two main beam receiving element patterns c on the lower side,
Difference between the optical output of d (Ic + Id) and {(Ia + Ib)
If the mounting position in the vertical direction (Y direction) is adjusted so that − (Ic + Id)} becomes zero, the position of the light beam spot may be shifted in the horizontal direction (X direction).

Next, the difference {(Ia + Ib)-(Ic +
Id)} is adjusted to 0 in the vertical direction (Y direction), and the CD return light is detected based on the light detection outputs IA to ID of the CD main beam light receiving element pattern portion 18a1. Recognize the position of the light beam spot of. Here, it is only necessary to detect whether the light beam spot of the CD return light is shifted upward or downward with respect to the center position of the CD main beam light receiving element pattern portion 18a1.

Next, the mounting position of the photodetector 18 is moved upward or downward (Y direction) in the direction in which the detected deviation direction is corrected. Here, the sum of the optical outputs of the upper two main beam light receiving element patterns A and B among the four main beam light receiving element patterns A, B, C and D (IA + I)
B) and two main beam receiving element patterns C and D on the lower side
Difference of the optical output of (IC + ID) {(IA + IB)-
The mounting position of the photodetector 18 is moved in the Y direction until (IC + ID)} becomes zero. Then, the difference {(IA +
The moving distance ΔY in the Y direction until IB) − (IC + ID)} becomes zero is obtained.

As shown in FIG. 11B, when the moving distance ΔY in the Y direction is obtained, the photodetector 18 is calculated from the relationship between the distance LB between the light receiving portions 18a and 18b and the moving distance ΔY in the Y direction.
The inclination θ of the mounting direction of is determined (θ = tan (ΔY / L
B)).

Therefore, the photodetector 1 is moved by the obtained tilt angle θ.
After the mounting direction of 8 is corrected, the mounting position of the photodetector 18 is adjusted in the left-right direction (X direction) and the vertical direction (Y direction), so that the beam spot of each return light is received by each light receiving unit 18.
It can be adjusted so as to come to the approximate center position of a and 18b.

It should be noted that the photodetector 18 is moved by the determined tilt angle θ.
After the mounting direction is corrected, the mounting position of the photodetector 18 is returned in the vertical direction (Y direction) by 1/2 of the movement amount ΔY in the Y direction, and in that state, one of the light receiving portions 18a,
It is also possible to detect the light detection output balance of 18b and adjust the mounting position of the photodetector 18 in the horizontal direction (X direction) and the vertical direction (Y direction).

FIG. 12 is an explanatory view showing still another example of the method for detecting the mounting inclination (positional deviation of the mounting position in the rotational direction) of the photodetector with respect to the light beam spot of each return light. The third mounting inclination detecting method shown in FIG. 12 is the same as the optical output balance of the main beam receiving elements a, b, c, d of the main beam receiving element pattern portion 18b1 for DVD and the CD.
Of the main beam light receiving elements A, B, C, D of the main beam light receiving element pattern portion 18a1 for use for detecting the deviation direction of the mounting direction of the photodetector 18 and the deviation amount (deviation Angle) is estimated. It should be noted that only the deviation direction of the mounting direction of the photodetector 18 is detected without estimating the deviation amount (deviation angle), and the mounting direction of the photodetector 18 is corrected in the direction in which the deviation direction is corrected. May be.

After correcting the mounting direction of the photodetector 18, for example, each main beam light receiving element a, b, c, d of the main beam light receiving element pattern portion 18b1 for DVD is used.
By detecting the light output balance and adjusting the mounting position of the photodetector 18 in the left-right direction (X direction) and the up-down direction (Y direction). Each of 18a1 and 18b1 can be located substantially at the center.

As shown in FIGS. 10 to 12, the mounting direction deviation (positional deviation in the rotation direction) θ of the photodetector 18 is detected, or the mounting direction deviation direction is detected and the mounting direction is determined. After correcting the deviation (positional deviation in the rotation direction),
By adjusting the mounting position of the photodetector 18 again in the left-right direction (X direction) and the up-down direction (Y direction), the beam spots of the respective return lights are adjusted to the respective main beam light receiving element pattern portions 18
Each of a1 and 18b1 can be located substantially at the center. Thereby, the mounting position of the photodetector 18 can be adjusted efficiently in a short time.

Further, a mechanism for adjusting the mounting direction of the hole, groove, protrusion, notch or cut-and-raised part which is engaged with the jig for adjusting the mounting direction of the photodetector mounting plate 17. By providing, it is possible to easily adjust the mounting direction.

[0088]

As described above, according to the present invention, a plurality of light receiving part patterns for individually receiving respective return lights emitted from a plurality of light sources and reflected by an optical recording medium are formed on the same substrate. In the optical pickup device having the photodetector, the mounting position of the photodetector can be efficiently adjusted. Further, the adjustment of the mounting position of the photodetector can be automated.

[Brief description of drawings]

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

FIG. 2 is a perspective view showing a schematic structure of a two-wavelength semiconductor laser (laser diode) which constitutes a light source used in the optical pickup device according to the embodiment of the present invention.

3A and 3B are structural views of an objective lens used in the optical pickup device according to the embodiment of the present invention, FIG. 3A is a front view, and FIG. 3B is a side view.

FIG. 4 is a diagram showing a light receiving element pattern configuration of a light receiving portion of a photodetector used in the optical pickup device according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram of an operation mode of a photodetector (PD-IC) used in the optical pickup device according to the embodiment of the present invention.

FIG. 6 is a schematic structural diagram of another optical pickup device according to an embodiment of the present invention.

FIG. 7 is a perspective view showing an example of a method for adjusting the mounting position of the photodetector used in the optical pickup device according to the embodiment of the present invention.

8A and 8B are diagrams showing an example of the structure of the mounting portion of the photodetector used in the optical pickup device according to the embodiment of the present invention, FIG. 8A being a plan view and FIG. 8B being a side view. , Fig. 8
(C) is a figure which shows the attachment structure of the photodetector with respect to a photodetector attachment plate.

FIG. 9 is a block configuration diagram of a photodetector mounting position adjusting device according to an embodiment of the present invention.

FIG. 10 Detects the mounting inclination (positional deviation of the mounting position in the rotational direction) of the photodetector with respect to the light beam spot of each return light in the method for adjusting the photodetector mounting position of the optical pickup device according to the embodiment of the present invention. It is explanatory drawing which shows an example of the method of doing.

FIG. 11 is a diagram for detecting a mounting inclination of the photodetector with respect to a light beam spot of each return light (a displacement of the mounting position in a rotation direction) in the method for adjusting the photodetector mounting position of the optical pickup device according to the embodiment of the present invention. It is explanatory drawing which shows the other example of the method.

FIG. 12 Detects the mounting inclination (positional deviation of the mounting position in the rotational direction) of the photodetector with respect to the light beam spot of each return light in the method for adjusting the photodetector mounting position of the optical pickup device according to the embodiment of the present invention. It is explanatory drawing which shows the further another example of the method.

[Explanation of symbols]

1a Compact disc (CD) 1b Digital versatile disc (DVD) 10,20 Optical pickup device 11,21 Two-wavelength semiconductor laser (plural light sources) 11d, 11e, 21d, 21e Light emitting point 12, 22 Phase difference plate 13a, 13b, 23a, 23b Diffraction grating 14, 24 Beam splitter (beam splitter plate) 15, 25 Collimator lens 16, 26 Objective lens (double focus diffraction type objective lens) 17 Photodetector mounting plate 17a, 17b Hole (photodetector 18, 28 Photodetector (PD-IC) 18a, 28a CD light receiving portion 18b, 28b DVD light receiving portion 18a1, 18b1 Main beam light receiving element pattern portion 18a2, 18a3, 18b2 18b3 Sub-beam light receiving element pattern portion 41 COB substrate 42 Flexible wiring board LA Distance between light emitting points LB Distance between light receiving parts X Horizontal direction (horizontal direction) Y Vertical direction (vertical direction) Z Front-back direction (optical axis direction of photodetector) ΔY Y-direction (vertical direction) movement distance θ Deviation angle of mounting direction of photodetector and rotation direction of photodetector with respect to optical axis

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Mitsuru Kinouchi             1-13-1, Nihonbashi, Chuo-ku, Tokyo             -In DC Inc. F term (reference) 5D117 AA02 CC07 HH01 HH10 KK01                       KK14                 5D119 AA38 BA01 BB01 BB04 EC45                       EC47 FA08 KA04 KA42 NA06                 5D789 AA38 BA01 BB01 BB04 EC45                       EC47 FA08 KA04 KA42 NA06

Claims (10)

[Claims] 1. A plurality of light sources that emit light having different wavelengths,
The optical detection of an optical pickup device having a photodetector having a plurality of light receiving portions for individually receiving the respective return lights of the light emitted from the plurality of light sources reflected by the optical recording medium. A method for adjusting a photodetector mounting position for adjusting the mounting position of a photodetector, wherein a positional deviation in the rotational direction of the photodetector is obtained by detecting each optical output balance of the plurality of light receiving units, and the position in the rotational direction is determined. A method for adjusting a photodetector mounting position of an optical pickup device, which comprises correcting the mounting position of the photodetector based on the shift. 2. A photodetector mounting position adjusting method for an optical pickup device according to claim 1, wherein the plurality of light sources are arranged on the same substrate. Adjustment method. 3. The method for adjusting a photodetector mounting position of an optical pickup device according to claim 1, wherein the plurality of light sources are two, and the plurality of light receiving sections are two. Method for adjusting photodetector mounting position of optical pickup device. 4. The method for adjusting a photodetector mounting position of an optical pickup device according to claim 3, wherein one light output balance of the light receiving section is detected, and one light spot of the return light is received by the one light receiving section. Of the photodetector by adjusting the mounting position of the photodetector so that the light is received substantially at the center of the section, and detecting the light output balance of the other light receiving section that receives the other light spot of the return light. A method for adjusting a photodetector mounting position of an optical pickup device, which comprises obtaining a positional deviation in a rotational direction and correcting the mounting position of the photodetector based on the positional deviation in the rotational direction. 5. A method of adjusting a photodetector mounting position of an optical pickup device according to claim 3, wherein the one light spot of the return light is received substantially at the center of one of the light receiving portions. The mounting position of the photodetector is adjusted so that the other light spot of the return light is received at the substantially center of the other of the light receiving unit, and the previous adjustment position and the next adjustment position. The positional deviation of the photodetector in the rotation direction is obtained based on the above, and the mounting position of the photodetector is corrected based on the positional deviation in the rotation direction. Method. 6. The method for adjusting a photodetector mounting position of an optical pickup device according to claim 3, wherein one light spot of the return light can receive one of the light receiving portions and the other light of the return light. The photodetection is performed by adjusting the mounting position of the photodetector so that the spot can be received by the other of the light receiving units, and detecting the light output balance of the one light receiving unit and the light output balance of the other light receiving unit. A method for adjusting a photodetector mounting position of an optical pickup device, comprising: obtaining a positional deviation in a rotational direction of a container, and correcting the mounting position of the photodetector based on the positional deviation in the rotational direction. 7. A plurality of light sources that emit light of different wavelengths,
A method for manufacturing an optical pickup device, comprising: a photodetector having a plurality of light receiving portions formed on the same substrate for individually receiving respective return lights of light emitted from the plurality of light sources and reflected by an optical recording medium. A photodetector mounting position adjusting method according to any one of claims 1 to 6 is used in a photodetector mounting position adjusting step for adjusting a mounting position of the photodetector. Manufacturing method of pickup device. 8. A plurality of light sources for emitting light having different wavelengths,
The photodetection of an optical pickup device having a photodetector having a plurality of light receiving portions formed on the same substrate for individually receiving the respective return lights of the light emitted from the plurality of light sources reflected by an optical recording medium. A photodetector mounting position adjusting device for adjusting a mounting position of a vessel, wherein an engaging portion that engages a photodetector mounting plate on which the photodetector is mounted, and a position of the engaging portion are moved, And a mounting position adjusting mechanism for adjusting the mounting position of the photodetector by rotating the direction of the engaging portion, and detecting the respective light output balances of the respective light spots received by the plurality of light receiving portions, And a mounting position adjustment control device for determining the displacement of the photodetector in the rotation direction and driving the mounting position adjustment mechanism based on the displacement of the rotation direction to correct the mounting position of the photodetector. Characteristic of optical pickup device Detector installation position adjusting device. 9. The same substrate includes a plurality of light sources for emitting lights having different wavelengths and a plurality of light receiving portions for individually receiving the respective return lights of the lights emitted from the plurality of light sources reflected by an optical recording medium. An optical pickup device, comprising: a photodetector formed above; and a photodetector mounting plate having an adjusting mechanism for adjusting a mounting position of the photodetector. 10. The optical pickup device according to claim 9, wherein the plurality of light sources are arranged on the same substrate.