JPH10241189A - Optical pickup device and optical recording medium driving device equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical pickup device which is applicable to a plurality of information recording media whose information recording densities are different and whose size is reduced. SOLUTION: A DVD reproducing 1st semiconductor laser device 2a and a CD reproducing 2nd semiconductor laser device 2b are provided on the supporting plane 10a of a lower frame 10. In the laser beam emitting direction of the 1st and 2nd semiconductor laser devices 2a and 2b, a trisectionizing diffraction lattice 4 by which the laser beam is divided into three diffracted beams, i.e., a 0 degree diffracted beam and ±1st degree diffracted beams, and a transmitting hologram device 5 by which three diffracted beams are diffracted in a 1st degree diffraction direction and a -1st degree diffraction direction and transmitted are provided. Further, a reflective mirror 6 provided on the supporting plane 10a reflects a feedback beam vertically upward and guides the beam to a photodetector 12 attached to an upper frame 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an optical pickup device and an optical recording medium driving device including the same.

[0002]

2. Description of the Related Art In recent years, optical pickup devices corresponding to various information recording media have been researched and developed.

FIG. 8 is a configuration diagram of a conventional optical pickup device. This optical pickup device is a device that performs focus servo by an astigmatism method and tracking servo by a three-beam method.
No. 5 discloses this.

[0004] As shown in FIG. 8, an optical pickup device includes a semiconductor laser 10 for emitting laser light vertically upward.
2. A diffraction grating 103 for dividing the laser beam into three light beams, a hologram element 10 that transmits the three divided light beams and diffracts a return light beam from the optical disc 100.
4. A condensing lens 105 for condensing the three light beams transmitted through the hologram element 104 as three spots on the recording surface of the optical disc 100, and a photodetector 106 for detecting a return light beam diffracted by the hologram element 104. It has.

In the above-described optical pickup device, a laser beam having a predetermined wavelength is emitted from the semiconductor laser 102, passes through an optical system including a three-division diffraction grating 103, a hologram element 104, and a condenser lens 105, and outputs an optical disk 100. The recording surface is irradiated. The irradiated light beam is reflected as a return light beam containing information recorded on the recording surface of the optical disc 100, passes through the condenser lens 105 and the hologram element 104, and enters the light receiving element 106. The light receiving element 106 detects an information detection signal based on the received light beam,
It outputs a focus servo signal and a tracking servo signal.

Recently, not only CDs (compact disks) but also information recording media of various standards having different recording densities such as track densities, for example, DVDs (digital video disks) have been developed. Therefore, an optical pickup device capable of reproducing various information recording media having different recording densities is desired.

[0007]

However, in the conventional optical pickup device shown in FIG. 8, the semiconductor laser 102 for emitting laser light having a wavelength suitable for reproducing a specific information recording medium, for example, a CD, and each optical element are used. Is set. For this reason, it is impossible to reproduce information recording media of other standards having different recording densities.

Accordingly, the present inventors have focused on an optical pickup device having a plurality of light sources that emit light having a wavelength suitable for the recording density of an information recording medium. For example, a laser beam having a wavelength suitable for reproducing CDs and DVDs An optical pickup device using two semiconductor laser elements that emit light is proposed. The optical pickup device according to the present proposal has been filed as Japanese Patent Application No. 7-283461, and has not been disclosed as of the filing date of the present application.

In the optical pickup device according to the above proposal, one of two semiconductor laser elements is selected according to the type of the information recording medium to be reproduced, and a laser beam of a predetermined wavelength is vertically emitted from the selected semiconductor laser element. The light is emitted upward, is made incident on the recording surface of the information recording medium, and the return light beam is made incident on the light receiving element to output an information detection signal and the like.

In recent years, there has been a strong demand for miniaturization, weight reduction and cost reduction of optical pickup devices. Therefore, the inventors conducted intensive research on the optical pickup device proposed above in accordance with such a request, and came to develop the optical pickup device of the present invention.

An object of the present invention is to provide an optical pickup device which can be applied to a plurality of information recording media having different information recording densities and is miniaturized, and an optical recording medium driving device including the same.

[0012]

An optical pickup device according to the present invention includes a plurality of light emitting elements which are arranged on a predetermined support surface and emit light beams having different wavelengths in a direction substantially parallel to the support surface. A diffractive element that diffracts light beams emitted from the plurality of light emitting elements and transmits the diffracted light beams in a predetermined optical axis direction, and a light receiving element that receives a return light beam based on the light beams emitted from the plurality of light emitting elements. , The light receiving element is arranged on a support surface different from the support surface on which the plurality of light emitting elements are arranged.

The optical pickup device according to the present invention includes a plurality of light emitting elements for emitting light beams having wavelengths suitable for a plurality of optical recording media having different recording densities, and is optimal according to the type of the optical recording medium to be processed. By selecting and using such a light emitting element, a single optical pickup device can perform reproduction processing of a plurality of types of optical recording media. In addition, in a state where the optical pickup device is incorporated in a reproducing apparatus or the like, most of the optical paths of the light beam emitted from the light emitting element and the feedback light beam based on the light beam are arranged in the horizontal direction, so that the light beam is orthogonal to the optical recording medium. The optical path area is shortened, and the vertical thickness of the light emitting and receiving unit is reduced, so that the entire optical pickup device can be made thinner.

Note that the light emitting / receiving unit is a unit of a light emitting element, a transmission type diffraction element, a light receiving element or a splitting diffraction element in an optical pickup device, and is located in an optical path between the optical recording medium and the diffraction element. Excluding the reflection mirror and the condenser lens disposed in

Further, since the light emitting element and the light receiving element are arranged on different support surfaces, the wiring member connected to the light emitting element and the wiring member connected to the light receiving element are prevented from being arranged on the same plane. The width of the light emitting and receiving unit can be reduced. Thus, the planar area of the optical pickup device can be reduced.

In particular, the optical pickup device according to the present invention comprises a first support member having a first support surface formed thereon, and a first support member having a first support surface formed thereon.
A plurality of light emitting elements that are arranged on the support surface and emit light beams having wavelengths corresponding to a plurality of types of optical recording media having different recording densities substantially in parallel to the first support surface, and emitted from the plurality of light emitting elements. A second support member having a diffractive element that diffracts the light beam and transmits a return light beam based on the light beam from the light emitting element, and a second support surface substantially parallel to the first support surface on which the plurality of light emitting elements are arranged And a light receiving element disposed on the second support surface and receiving the return light flux transmitted through the diffraction element.

The optical pickup device according to the present invention includes a plurality of light emitting elements for emitting a light beam having a wavelength suitable for a plurality of optical recording media having different recording densities, and is optimal according to the type of the optical recording medium to be processed. By selecting and using such a light emitting element, a single optical pickup device can perform reproduction processing of a plurality of types of optical recording media. In addition, in a state where the optical pickup device is incorporated in a reproducing apparatus or the like, most of the optical paths of the light beam emitted from the light emitting element and the feedback light beam based on the light beam are arranged in the horizontal direction, so that the light beam is orthogonal to the optical recording medium. The optical path area is shortened, and the vertical thickness of the light emitting and receiving unit is reduced, so that the entire optical pickup device can be made thinner.

Further, by disposing the light emitting element and the light receiving element on different supporting surfaces, it is possible to prevent the wiring member connected to the light emitting element and the wiring member connected to the light receiving element from being arranged on the same plane. The width of the light emitting and receiving unit can be reduced. Thus, the planar area of the optical pickup device can be reduced.

Further, the plurality of light emitting elements emit light beams obliquely to an axis orthogonal to the diffraction surface of the diffraction element, and the diffraction surface of the diffraction element emits light beams incident obliquely to the diffraction surface. The light is diffracted and transmitted along an axis substantially parallel to the first support surface and perpendicular to the diffraction surface.

In particular, the first light-emitting element in which the plurality of light-emitting elements emit a light beam of the first wavelength and the second light-emitting element different from the first wavelength.
A second light emitting element that emits a light beam having a wavelength of
It is preferable that the optical path of the light beam from the light emitting element and the optical path of the light beam from the second light emitting element match after diffraction by the diffraction element.

In this case, an optical system can be provided in common for the light beams from the first light emitting element and the second light emitting element after the diffraction element, so that the configuration of the optical system is simplified and the adjustment is easy. Becomes

In particular, the plurality of light emitting elements include a first light emitting element for emitting a light beam of a first wavelength and a second light emitting element for emitting a light beam of a second wavelength different from the first wavelength. The first light-emitting element and the second light-emitting element are disposed on opposite sides of an axis orthogonal to the diffraction surface of the diffraction element, and the light-receiving element is positioned on an axis orthogonal to the diffraction surface of the diffraction element. Preferably, they are arranged along. In this case, if both the first and second light emitting elements are arranged on one side of the axis orthogonal to the diffraction surface of the diffraction element, there is a problem that the positions where both should be arranged are close to each other and the arrangement becomes difficult. Can be prevented. Further, it is preferable to further include a reflecting member disposed on the first support surface, for reflecting the return light flux transmitted through the diffraction element and guiding the reflected light flux to the light receiving element. Thereby, the return light beam can be easily guided to the light receiving element arranged on the support surface different from the light emitting element.

In particular, it is preferable that the first support member and the second support member have joint surfaces substantially parallel to the first support surface and the second support surface. In this case, by relatively moving the first support member and the second support member along the joint surface, it becomes easy to adjust the positions of the reflection member and the light receiving element.

Further, a first wiring member electrically connected to the first light emitting element and a second wiring electrically connected to the second light emitting element are provided on the first supporting surface of the first supporting member. A third wiring member connected to the light receiving element is disposed on the second support surface of the second support member;
A part of the second wiring member protrudes from the first support member, and a part of the third wiring member protrudes from the second support member. In this case, the first and second wiring line members connected to the first and second light emitting elements and the third wiring member connected to the light receiving element are formed at different plane positions. Therefore, an increase in the width of the light emitting and receiving unit due to the arrangement of the plurality of wiring members on the same plane is suppressed, whereby a small optical pickup device with a reduced plane area can be obtained.

An optical recording medium driving device according to the present invention includes an optical pickup device according to any one of the above-mentioned inventions, a rotation driving section for rotating the optical recording medium, and moving the optical pickup device in a radial direction of the optical recording medium. An optical pickup driving unit for processing the signal output from the light receiving element of the optical pickup device.

In the optical recording medium driving device according to the present invention, the provision of the optical pickup device having a plurality of light emitting elements makes it possible to detect reproduction signals of a plurality of types of optical recording media having different recording densities. In addition, since the thickness and width of the optical pickup device are reduced, it is possible to obtain an optical recording medium driving device that is small and particularly thin.

[0027]

FIG. 1 is a side sectional view of an optical pickup device according to one embodiment of the present invention. The optical pickup device of the present embodiment is configured to be able to detect reproduction signals of CD and DVD. In FIG. 1, an optical pickup device 20 includes first and second semiconductor laser elements 2a and 2a.
b, a light projecting / receiving unit 21 in which a diffraction grating 4 for three divisions, a transmission hologram element 5 and the like are unitized, and a reflecting mirror 1
4 and an objective lens 15.

FIG. 2 is an exploded perspective view of the light emitting and receiving unit, FIG. 3 is a plan view of an upper frame of the light emitting and receiving unit, and FIG. 4 is a plan view of a lower frame. Note that the X-axis, Y-axis, and Z-axis are described in each drawing in order to clarify the positional relationship of each drawing in FIGS.

In FIG. 2 to FIG.
Has a housing in which an upper frame (second support member) 11 and a lower frame (first support member) 10 made of a resin mold are laminated and bonded and fixed to each other.

2 and 4, the lower frame 10
Is composed of a flat resin mold, and has a support surface (first support surface) 10a on which the first and second semiconductor laser elements 2a and 2b, the reflection mirror 6, and the like are arranged, a three-divided diffraction grating 4, and a transmission hologram. Recess 10b in which element 5 is arranged
have. A flat joining surface 1 joined to the upper frame 11 is provided around the supporting surface 10a and the concave portion 10b.
0c is formed.

In FIG. 4, the optical axis of the return light beam from the optical disk (optical recording medium) is denoted by Z0, and the optical axis of the light beam emitted from the first semiconductor laser element 2a (first light emitting element) is denoted by Z1. The optical axis of the laser light emitted from the second semiconductor laser element 2b (second light emitting element) is indicated by Z2. Two conductive heat sinks 1a and 1b are arranged on a support surface 10a of the lower frame 10, and the first and second semiconductor laser elements 2a and 2b and a monitoring photodiode are provided on the upper surfaces of the conductive heat sinks 1a and 1b. 3
a and 3b are arranged. The Z1 axis coincides with the + 1st-order diffraction direction of the transmission hologram element 5 described later,
The first semiconductor laser element 2a is arranged along the Z1 axis. The Z2 axis is -1 of the transmission hologram element.
The diffraction direction coincides with the next diffraction direction, and the second semiconductor laser 2b is arranged along the Z2 axis.

The first semiconductor laser 2a has a wavelength of 635 nm.
And is used at the time of DVD reproduction. The second semiconductor laser element 2b outputs a laser beam having a wavelength of 780 nm and is used at the time of reproducing a CD.

The monitoring photodiodes 3a and 3b are respectively arranged on the rear end faces of the first semiconductor laser element 2a and the second semiconductor laser element 2b, and the rear end faces of the first and second semiconductor laser elements 2a and 2b. The laser light emitted from the light source is received as monitor light. Output signals from the monitoring photodiodes 3a and 3b are output to an automatic output control circuit (not shown), and based on the output signals, the output of the laser light from the first and second semiconductor laser elements 2a and 2b is constant. It is controlled so that

Further, on the support surface 10a, there are provided lead frames 7c and 7f for supplying power to the first semiconductor laser element 2a and the second semiconductor laser element 2b, respectively, and a lead frame 7 having a polarity opposite to that of the lead frames 7c and 7f.
d, 7e, lead frames 7b, 7g for outputting signals from the monitoring photodiodes 3a, 3b, and the first
And common to the second semiconductor laser elements 2a and 2b and the monitoring photodiodes 3a and 3b (for example, for grounding).
Lead frames 7a and 7h are arranged. The ends of the lead frames 7 a to 7 h project outward from the end surface of the lower frame 10.

A reflection mirror 6 is arranged near the center of the support surface 10a along the optical axis Z0 of the return light beam. The reflecting surface of the reflecting mirror 6 is set to be inclined at 45 degrees with respect to the horizontal plane (YZ plane) so as to reflect the returning light flux returning along the Z0 axis vertically upward.

In the recess 10b of the lower frame 10, a three-divided diffraction grating 4 and a transmission hologram element 5 are arranged. The three-division diffraction grating 4 is the first semiconductor laser element 2
Diffraction grating surfaces 4a and 4b each having a uniform pitch are formed on the surface on the side of the second semiconductor laser element 2b. The diffraction grating surface 4a of the three-division diffraction grating 4 divides the laser light emitted from the first semiconductor laser element 2a into three diffracted lights of 0th order, + 1st order and -1st order, and emits them.
The diffraction grating surface 4b divides the laser light emitted from the second semiconductor laser element 2b into three diffracted lights of the 0th order, the + 1st order, and the -1st order and emits them.

The transmission hologram element (diffraction element) 5
It is made of a light-transmitting material having a hologram surface 5a on the surface on the side of the three-divided diffraction grating 4 having a group of curves in which the pitch of unevenness gradually changes. And 3 along the Z1 axis
The three diffracted lights transmitted through the splitting diffraction grating 4 are diffracted in the Z0 axis direction, and the three diffracted lights emitted from the three-splitting diffraction grating 4 along the Z2 axis are diffracted in the Z0 axis direction. Preferably, an optical path of a laser beam having a wavelength of 635 nm and a wavelength of 780 nm are used.
The optical path of the laser beam coincides after being transmitted and diffracted on the hologram surface 5a. Further, the return light beam from the optical disk is transmitted along the Z0 axis and guided to the three-division diffraction grating 4 and the reflection mirror 6.

Referring to FIG. 2 and FIG.
Is formed of a flat resin mold, and has a support surface 11a on which the photodiode 12 for signal detection is mounted, and a recess 11b corresponding to the recess 10b of the lower frame 10. A flat joint surface 11c is formed around the support surface 11a and the concave portion 11b.

The photodiode 12 for signal detection is mounted at a position where the light receiving surface 13 can receive the return light beam from the reflection mirror 6 mounted on the lower frame 10. Although the light receiving surface 13 is shown in a single rectangular shape in FIG. 3, in practice, a plurality of divided light receiving surfaces for outputting a focus signal and a reproduction signal by an astigmatism method and a three-beam method are used. And a plurality of divided light receiving surfaces for outputting a tracking error signal.
Further, the photodiode 12 is configured by a PIN photodiode. With the photodiode 12 mounted on the support surface 11a, the photodiode 1
The two light receiving surfaces 13 are arranged substantially parallel to the support surface 10a of the lower frame 10.

In the vicinity of the photodiode 12 for signal detection, a plurality of lead frames 14 for outputting a signal from the photodiode 12 are arranged. One end of the lead frame 14 extends near the photodiode 12 and is electrically connected to a terminal of the photodiode 12 by a bonding wire. The other end is the upper frame 11
And protrudes outward from the end surface of the upper frame 11.

At the time of manufacturing the above-mentioned light emitting and receiving unit 21 device, the transmission hologram element 5 receives the laser beams from the first and second semiconductor laser elements 2a and 2b respectively.
The position in the Z-axis direction is adjusted so as to focus on the recording surfaces of D and DVD. The upper frame 11 is moved relative to the lower frame 10 along the joint surfaces 10c and 11c so that the return light beam reflected by the reflection mirror 6 is accurately incident on the light receiving surface 13 of the photodiode 12. You. When the adjustment is completed, the upper frame 11 and the lower frame 10 are fixed by the adhesive. Thereby, the light emitting and receiving unit 21 is completed. Further, the light emitting and receiving unit 21 is disposed inside the optical pickup device 20 so as to have a predetermined positional relationship with the reflection mirror 14 and the condenser lens 15 of the optical pickup device 20.

Next, the operation of the optical pickup device according to this embodiment will be described. FIG. 5 is a schematic side view showing the operation of the optical system of the light emitting and receiving unit of the optical pickup device of FIG. 1, and FIG. 6 is a schematic plan view of the optical system of the light emitting and receiving unit.

Referring to FIGS. 1, 5 and 6, first, D
The VD reproduction operation will be described. The optical pickup device 20 drives the first semiconductor laser element 2a,
nm of laser light. First semiconductor laser element 2
The laser beam B1 emitted from a is incident on the diffraction grating surface 4a of the transmission-type three-segment diffraction grating 4, is split into three 0th-order, + 1st-order, and -1st-order diffracted lights and is transmitted. Incident on the transmission hologram element 5. The transmission hologram element 5 diffracts and transmits the three incident diffracted lights in the + 1st-order diffraction direction, and emits the light to the reflection mirror 14 along the Z0 axis. The reflection mirror 14 reflects the three diffracted lights substantially vertically upward.
The condensing lens 15 reflects the light reflected by the reflecting mirror 14.
The diffracted light of the book is focused on the recording surface of the DVD as a main spot and two sub spots. The main spot is condensed on the information recording surface (track surface), and the two sub-spots are condensed on a position over the track surface and the non-track surface.

The return light beams from the main spot and the two sub spots pass through the condenser lens 15 again, travel vertically downward, are reflected in the horizontal direction by the reflection mirror 14, and enter the transmission type hologram element 5. The incident return light beam passes through the transmission hologram element 5 and further passes through a portion of the three-divided diffraction grating where the diffraction grating surfaces 4a and 4b are not formed, and enters the reflection mirror 6.

The reflection mirror 6 reflects the return light beam vertically upward and guides it to the light receiving surface 13 of the signal detection photodiode 12 mounted on the upper frame 11.

The photodiode 12 generates a reproduction signal, a focus signal based on the astigmatism method, and a tracking error signal based on the three-beam method based on the return light beam, and outputs the generated signal through the lead frame 14.

Next, a CD reproducing operation will be described.
For reproducing a CD, a laser beam having a longer wavelength than that for reproducing a DVD is used. That is, the second semiconductor laser element 2b that emits a laser beam having a wavelength of 780 nm is driven. Second
The laser beam B2 emitted from the semiconductor laser element 2b is
The light is incident on the diffraction grating surface 4 b of the three-division diffraction grating 4. The diffraction grating surface 4b divides the laser beam B2 into three diffracted light beams of the 0th, + 1st and -1st order and transmits them. The three diffracted lights are
By the hologram surface 5a of the transmission type hologram element 5, -1
The light is diffracted in the next direction and emitted along the Z0 axis.

After that, the three diffracted lights pass through the reflection mirror 14 and the condenser lens 15 and are condensed on the recording surface of the CD as a main spot and two sub spots, similarly to the DVD reproducing operation. Further, the return light beam reflected by the recording surface of the CD passes through the condenser lens 15 and the reflection mirror 14 and enters the transmission hologram element 5. Further, the light passes through the transmission hologram element 5 and the three-division diffraction grating 4 and reaches the reflection mirror 6. The reflection mirror 6 reflects the return light flux almost vertically upward and makes it incident on the light receiving surface 13 of the photodiode 12 for signal detection. The photodiode 12 outputs a CD reproduction signal, a focus signal based on the astigmatism method, and a tracking error signal based on the three-beam method, based on the received return light beam.

In the above optical pickup device, the first semiconductor laser element 2a for emitting a short-wavelength laser beam suitable for reproducing a DVD, and the second semiconductor laser for emitting a long-wavelength laser beam suitable for reproducing a CD. Element 2b, and by using the first and second semiconductor laser elements 2a and 2b selectively according to the recording medium to be reproduced, a single optical pickup device can reproduce both CDs and DVDs having different recording densities. It can be carried out. In addition, except for the first and second semiconductor laser elements 2a and 2b, which are light sources, other optical systems are commonly used regardless of the type of optical recording medium. Therefore, size reduction and cost reduction can be achieved without increasing the number of components of the optical pickup device.

Further, by setting the emission direction of the laser light from the first and second semiconductor laser elements 2a and 2b to the horizontal direction, the thickness of the optical pickup device in the vertical direction can be reduced.

Further, a photodiode 1 for signal detection
2 is formed on the support surface 11a of the upper frame 11, which is different from the optical system such as the three-division diffraction element 4, the transmission hologram element 5, and the reflection mirror 6, so that the position adjustment with the optical system can be performed independently and accurately. It becomes possible.

In the above embodiment, an optical pickup device capable of reproducing two types of optical recording media, ie, CD and DVD, has been described. However, reproduction or recording of optical recording media having other recording densities is also possible. The reproduction or recording process can be performed by further providing a light source having a wavelength optimal for the laser beam.

In the above embodiment, the transmission type hologram element is used as the diffraction element. However, the present invention is not limited to this. For example, a reflection type diffraction grating may be used.

FIG. 7 is a block diagram showing a configuration of an optical recording medium driving device using the optical pickup device of this embodiment. The optical recording medium driving device has a motor 27 for driving the optical disc 100 to rotate, and a rotation control system 26 for controlling the rotation operation of the motor 27. The optical pickup device 20 includes a feed motor 22 for moving the detection position of the optical pickup device 20 in the radial direction of the optical disc 100.
Is connected. The operation of the feed motor 22 is controlled by a feed motor control system 23. The operation of the optical pickup device 20 is controlled by a pickup control system 24,
The output from the optical pickup device 20 is controlled by a signal processing system 25.

Further, the operation of each processing system of the optical recording medium driving device is controlled by the drive controller 28. The optical recording medium driving device is connected to a reproducing device via a drive interface 29, and performs information reproducing processing based on a detection signal from the optical pickup device 20.

By using the optical pickup device 20 of the present invention in the above-described optical recording medium driving device, it is possible to perform a reproducing process on a plurality of types of optical recording media. Further, since the optical pickup device 20 is downsized, the entire optical recording medium driving device can be downsized.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an optical pickup device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a light emitting and receiving unit of the optical pickup device of FIG.

FIG. 3 is a plan view of an upper frame of the light emitting and receiving unit of FIG. 2;

FIG. 4 is a plan view of a lower frame of the light emitting and receiving unit of FIG. 2;

FIG. 5 is a schematic side view showing the operation of the optical system of the light emitting and receiving unit.

FIG. 6 is a schematic plan view showing the operation of the optical system of the light emitting and receiving unit.

FIG. 7 is a block diagram showing a configuration of an optical recording medium driving device using an optical pickup device.

FIG. 8 is a configuration diagram of a conventional optical pickup device.

[Explanation of symbols]

2a, 2b 1st semiconductor laser element, 2nd semiconductor laser element 4 Diffraction grating for 3 divisions 4a, 4b Diffraction grating surface 5 Transmission hologram element 5a Hologram surface 6 Reflection mirror 10 Lower frame 11 Upper frame 10a, 11a Support surface 10c, 11c Joining surface

Continuation of front page (72) Inventor Yasuaki Inoue 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Minoru Sawada 2-5-2-5 Keihanhondori, Moriguchi-shi, Osaka Inside Sanyo Electric Co., Ltd. (72) Inventor Akira Ibaraki 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd.

Claims (9)

[Claims] 1. A plurality of light-emitting elements arranged on a predetermined support surface and emitting light beams having different wavelengths in a direction substantially parallel to the support surface, and diffracting light beams emitted from the plurality of light-emitting elements, respectively. A diffractive element that transmits light in a predetermined optical axis direction, and a light-receiving element that receives a return light beam based on light beams emitted from the plurality of light-emitting elements, wherein the light-receiving element includes the plurality of light-emitting elements. An optical pickup device disposed on a support surface different from the support surface. 2. A first support member having a first support surface formed thereon, and a light beam having a wavelength corresponding to a plurality of types of optical recording media having different recording densities, which is disposed on the first support surface. A plurality of light-emitting elements that emit light substantially parallel to the support surface of the first light-emitting element; a diffractive element that diffracts a light beam emitted from the plurality of light-emitting elements and transmits a return light beam based on the light beam from the light-emitting element; A second support member having a second support surface substantially parallel to the first support surface on which the light emitting element is disposed; and a return light beam that is disposed on the second support surface and that has passed through the diffraction element. An optical pickup device comprising: a light receiving element for receiving light. 3. The plurality of light emitting elements emit a light beam in an oblique direction with respect to an axis orthogonal to a diffraction surface of the diffraction element, and the diffraction surface of the diffraction element is oblique from the diffraction surface. 3. The optical pickup device according to claim 2, wherein the incident light beam is diffracted and transmitted along a plane substantially parallel to the first support surface and along an axis perpendicular to the diffraction surface. 4. The plurality of light emitting elements include a first light emitting element that emits a light beam of a first wavelength and a second light emitting element that emits a light beam of a second wavelength different from the first wavelength. The optical pickup device according to claim 3, wherein an optical path of a light beam from the first light emitting element and an optical path of a light beam from the second light emitting element match after being diffracted by the diffraction element. 5. The light emitting element according to claim 1, wherein the plurality of light emitting elements emit a light flux having a first wavelength, and a second light emitting element emit a light flux having a second wavelength different from the first wavelength. Wherein the first light emitting element and the second light emitting element are respectively arranged on opposite sides with respect to an axis orthogonal to a diffraction surface of the diffraction element, and the light receiving element is a diffraction surface of the diffraction element. 4. The optical pickup device according to claim 3, wherein the optical pickup device is arranged along an axis orthogonal to. 6. The light receiving device according to claim 2, further comprising a reflection member disposed on the first support surface, for reflecting the return light flux transmitted through the diffraction element and guiding the return light flux to the light receiving element.
6. The optical pickup device according to any one of items 1 to 5, 7. The apparatus according to claim 2, wherein said first support member and said second support member have a joint surface substantially parallel to said first support surface and said second support surface. 7. The optical pickup device according to any one of 6. 8. A first wiring member electrically connected to the first light emitting element and an electrical connection to the second light emitting element electrically connected to the first support surface of the first support member. A third wiring member connected to the light receiving element is disposed on the second support surface of the second support member; and the first and second wiring members are disposed on the second support surface of the second support member. 8. A part of the third wiring member protrudes from the first support member, and a part of the third wiring member protrudes from the second support member.
An optical pickup device according to any one of the above. 9. An optical pickup device according to claim 1, a rotation drive unit for rotating an optical recording medium, and an optical pickup drive for moving the optical pickup device in a radial direction of the optical recording medium. An optical recording medium driving device comprising: a processing unit configured to process a signal output from a light receiving element of the optical pickup device.