WO2006126357A1 - 光ピックアップ装置及び光ディスク装置 - Google Patents
光ピックアップ装置及び光ディスク装置 Download PDFInfo
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- WO2006126357A1 WO2006126357A1 PCT/JP2006/308519 JP2006308519W WO2006126357A1 WO 2006126357 A1 WO2006126357 A1 WO 2006126357A1 JP 2006308519 W JP2006308519 W JP 2006308519W WO 2006126357 A1 WO2006126357 A1 WO 2006126357A1
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- wavelength
- optical
- diffraction grating
- pickup device
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/127—Lasers; Multiple laser arrays
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1353—Diffractive elements, e.g. holograms or gratings
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/127—Lasers; Multiple laser arrays
- G11B7/1275—Two or more lasers having different wavelengths
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0006—Recording, reproducing or erasing systems characterised by the structure or type of the carrier adapted for scanning different types of carrier, e.g. CD & DVD
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/13—Optical detectors therefor
Definitions
- the present invention relates to an optical pickup device capable of recording / reproducing information with respect to a plurality of types of optical recording media, and an optical disk device including the optical pickup device, and more particularly.
- the present invention relates to an optical pickup device and an optical disc device that receive light of different wavelengths emitted by a common photodetector.
- a DVD laser output device with an output wavelength of about 650 nm and an output wavelength for recording / reproducing information (recording, reproduction, or both) on DVD (Digital Versatile Disk) and CD (Compact Disk).
- a two-light source optical pickup device equipped with a CD laser output device of about 780nm is used.
- a two-wavelength integrated laser output device capable of outputting two types of wavelengths in a single package has been put into practical use.
- the two-wavelength integrated laser output device includes a monolithic laser output device in which two laser diodes are formed on a monolithic semiconductor substrate, and a hybrid in which two semiconductor substrates each having a laser diode formed are bonded together. Type laser output devices are known.
- the emission positions of the two laser diodes are slightly separated, and the distance is generally about 110 m.
- the optical axis of one laser diode coincides with the system optical axis passing through the center of the collimating lens of the objective lens of the optical pickup device, the optical axis of the laser light emitted from the other laser diode is the system optical axial force. It will shift. In this state, the return light emitted from the DVD and CD laser diodes and reflected by the optical recording medium cannot be received by the common photodetector.
- the following first and second configurations have been proposed.
- the first configuration three laser output devices having different output wavelengths are provided, and the optical axes of the three types of wavelengths emitted from the laser output devices are used with a prism corresponding to each wavelength.
- the light of each wavelength is guided to the optical recording medium so as to coincide with the system optical axis.
- Return light of three types of wavelengths reflected by the optical recording medium passes through each prism, is guided to a common photodetector, and is detected by this photodetector (see, for example, Non-Patent Document 1).
- the second configuration uses a three-wavelength integrated laser output device in which three semiconductor substrates that emit light of different wavelengths ⁇ 1, 12, and ⁇ 3 are housed in one knocker.
- the emission position of the light of wavelength ⁇ 1 (405 nm) and the emission position of the light of wavelength ⁇ 2 (660 nm) are arranged at substantially the same position when viewed from the optical axis direction of the output light of the laser output device.
- the emission position of (785 nm) light is arranged at a distance of about 110 m from each emission position force of light of wavelengths ⁇ 1 and ⁇ 2.
- the return light of wavelength 2 and ⁇ 3 is detected by the common photodetector, and the return light of wavelength ⁇ 1 is the prism. And detected by another photodetector (see, for example, Non-Patent Document 2).
- Patent Document 1 Japanese Patent Laid-Open No. 2001-143312
- Patent Document 2 JP 2001-256670 A
- Non-Patent Document 1 “Holland Philips develops optical heads that can be recorded and played on CDs, DVDs, and Blu-ray Discs”, [online], July 16, 2004, Nikkei BP, [2005 2 May 20], Internet ⁇ http: ⁇ techon.nikke3 ⁇ 4p.co.jp / members / NEWS / 20040716/104521 />
- Non-patent document 2 “For Blu-ray Disc 'DVD' CD compatible with 3 wavelength recording and playback Developed optical head ", [online], May 17, 2004, Sony Corporation, [February 20, 2005 ], Internet ⁇ http: // www .sony.co.jp / SonvInro / News / Press / 200405 / 04-026 /
- Non-patent Document 1 the return light reflected by the optical recording medium can be received by a common photodetector.
- the optical axis of each laser output device is Many optical parts (prisms, etc.) are required to match the system optical axis of the optical pickup device. As a result, the number of components of the optical pickup device increases, making it difficult to reduce the size and cost of the device. There is a problem.
- Non-Patent Document 2 a prism for separating the return light having the wavelength ⁇ 1 from each return light reflected by the signal recording surface of the optical recording medium, and this wavelength
- a special photodetector is required to detect the return light of ⁇ 1 and some optical axis adjustment means is required to receive the return light of wavelength 2 and ⁇ 3 with the common photodetector. Therefore, it is difficult to reduce the size and cost of the device.
- the size reduction and the cost reduction are realized by using a phase difference type diffraction grating or the like (Patent Documents 1 and 2). It is conceivable to use a phase difference type diffraction grating in the optical pickup device as well.
- the diffraction angle of the first-order or higher-order diffracted light of the wavelength is different, and the deviations are different. Therefore, there is a problem that it is difficult to guide the return light of three wavelengths to a common photodetector.
- phase difference type diffraction grating (Patent Documents 1 and 2) is applied to the configuration of the optical pickup device (Non-Patent Documents 1 and 2) using the above-described three-wavelength integrated laser output device, and the wavelength It is also conceivable to guide the 0th-order diffracted light of light of ⁇ 1 (405 nm) and wavelength ⁇ 2 (660 nm) and the 1st-order or higher diffracted light of light of wavelength ⁇ 3 (785 nm) to a common photodetector.
- the present invention has been made to solve the above-described problems, and information on a plurality of types of optical recording media (for example, DVD, CD, blue-violet laser optical disk) having different wavelengths of light used.
- the purpose is to enable detection of the three types of return light reflected by the optical recording medium with a common photodetector.
- An optical pickup device includes a first light emitting unit that emits light of a first wavelength, a second light emitting unit that emits light of a second wavelength, and light of a third wavelength.
- the light emission position of the first light emission part and the light emission position of the third light emission part are substantially the same as viewed from the direction of the optical axis of the emitted light.
- a laser output device configured to be in the same position, a photodetector, and each of the laser light emitted from the first, second, and third light emitting units of the laser output device and reflected by the optical recording medium.
- An optical axis adjusting element that adjusts an optical axis of the return light having at least one wavelength among the return lights having the first, second, and third wavelengths so that the return light of the first and second wavelengths is received by the photodetector.
- the first and third wavelengths of light emitted from the first and third light emitting unit forces are guided to the optical recording medium through substantially the same optical path, and the second The light of the second wavelength that has also been emitted from the light-emitting portion is guided to the optical recording medium through the optical path of the light of the first and third wavelengths with a small distance.
- the optical axis of the return light of at least one wavelength is adjusted by the optical axis adjusting element, and each return light is common.
- Light is received by the photodetector. Since the three types of return light reflected by the optical recording medium can be detected by a common photodetector, it is possible to reduce the size and cost of the optical pickup device (and the optical disk device using the same).
- FIG. 1 is a perspective view showing a laser output device according to Embodiment 1 of the present invention.
- FIG. 2 is a diagram showing an optical path system of the optical pickup device in the first embodiment of the present invention.
- FIG. 3 is an enlarged view showing a laser output unit and a photo detector part of the optical pickup device in the first embodiment of the present invention.
- FIG. 4 is a diagram for explaining diffraction by the optical axis adjusting element in the first embodiment of the present invention.
- FIG. 6 is a graph showing the diffraction efficiency of a two-level Neua reblazed diffraction grating in Embodiment 1 of the present invention.
- FIG. 7 is a graph showing the diffraction efficiency of a three-level Neua Reblaise diffraction grating in Embodiment 1 of the present invention.
- FIG. 8 is a graph showing the diffraction efficiency of a four-level Neua Reblaise diffraction grating in Embodiment 1 of the present invention.
- FIG. 9 is a graph showing the diffraction efficiency of a five-level Neua Reblaise diffraction grating in Embodiment 1 of the present invention.
- FIG. 10 is a graph showing the diffraction efficiency of a 6-level Neua Reblaise diffraction grating in Embodiment 1 of the present invention.
- FIG. 11 is a graph showing the diffraction efficiency of a seven-level Neua Reblaise diffraction grating in Embodiment 1 of the present invention.
- FIG. 12 is a graph showing the diffraction efficiency of a neighbourise type diffraction grating having 8 levels in Embodiment 1 of the present invention.
- FIG. 13 is a graph showing the first-order diffraction efficiency of wavelength ⁇ 2 for each number of levels in Embodiment 1 of the present invention.
- FIG. 14 A perspective view showing a laser output device according to the second embodiment of the present invention.
- FIG. 15 is a perspective view showing another example of a laser output device according to the second embodiment of the present invention.
- FIG. 16 is a perspective view showing the basic configuration of the optical disc apparatus in the fifth embodiment of the present invention.
- FIG. 1 is an enlarged perspective view showing a three-wavelength integrated laser output device 9 of the optical pickup device according to Embodiment 1 of the present invention.
- the optical pickup device according to the first embodiment records and reproduces information on a blue-violet laser optical disc having a capacity several times that of DVD and CD which are conventional optical recording media (recording and reproducing). (Or both).
- the optical pickup device includes the three-wavelength integrated laser output device 9 (hereinafter simply referred to as laser output device 9) shown in FIG. 1 as a light source.
- This laser output device 9 is a combination of three semiconductor substrates 1, 2, and 3 into one package. In each of the semiconductor substrates 1, 2, 3, light emitting parts 4, 5, 6 made of laser diodes are formed.
- the light emitting units 4, 5, and 6 emit light of wavelength ⁇ 1 (about 405 nm), wavelength 2 (about 650 nm), and wavelength 3 (about 780 nm) according to the applied voltage, respectively. ! /
- the laser output unit 9 emits light of any one of the three wavelengths ⁇ ⁇ , ⁇ 2, and ⁇ 3 by applying a voltage to one of the light emitting units 4, 5, and 6. It has become.
- the laser output device 9 includes a semiconductor substrate 2 that emits light having a wavelength ⁇ 2 and a semiconductor that emits light having a wavelength ⁇ 3 on a semiconductor substrate 1 that emits light having a wavelength ⁇ 1.
- the board 3 is attached in parallel.
- the positions where the semiconductor substrates 2 and 3 are attached are the light emitting section 4 that emits light of wavelength ⁇ 1 and the light emitting section 6 that emits light of wavelength 3 and the optical axis of the emitted light of the laser output device 9 (reference numeral It is determined to be almost the same as seen from the direction of X).
- FIG. 2 is a diagram showing an optical system of the optical pickup device according to the first embodiment.
- FIG. 3 is an enlarged view of a part of the optical system of the optical pickup device according to the first embodiment. 2 and 3, the optical path of the light of each wavelength emitted from the laser output device 9 is indicated by the symbol L. As shown in FIG.
- the optical pickup device has a grating lens 10 on which light emitted from the laser output device 9 enters.
- the grating lens 10 is for forming a sub beam necessary for tracking error signal detection (three-beam method, differential push-pull method, etc.) generally performed in an optical pickup device.
- the optical pickup device further includes a prism 11 on which light transmitted through the grating lens 10 enters.
- the prism 11 serves as a polarization beam splitter that switches between reflection and transmission according to the polarization direction of incident light.
- the prism 11 transmits the light emitted from the laser output device 9 and transmitted through the grating lens 10 (that is, the forward light).
- the optical pickup device has a mirror 12 that reflects light transmitted through the prism 11, a collimating lens 13 that receives light reflected by the mirror 12, and light that passes through the collimating lens 13. And a wave plate 14 to be used.
- the collimating lens 13 converts incident light into parallel light.
- the wave plate 14 is a so-called 4 ⁇ wave plate that has an action of converting linearly polarized light into circularly polarized light.
- the light passing through the wave plate 14 enters the objective lens 15 and is condensed on the signal recording surface of the optical disk 16 (DVD, CD or blue-violet laser optical disk).
- each optical disc 16 The light collected on the signal recording surface of each optical disc 16 is modulated and reflected according to the information signal recorded on the signal recording surface to be returned light, passes through the objective lens 15 and again. It becomes parallel light and enters the wave plate 14.
- the circular polarization force is a force that is converted into linearly polarized light.
- the polarization direction at this time is 90 degrees different from the forward path.
- the return light that has passed through the wave plate 14 passes through the collimating lens 13 to become a condensed light beam, is reflected by the mirror 12, and enters the prism 11.
- the prism 11 due to its polarization dependence, reflected light whose polarization direction is different by 90 degrees from the forward path is reflected (deflected by 90 degrees) and guided to the sensor lens 17.
- the sensor lens 17 is for giving astigmatism necessary for focus error signal detection generally performed in the optical pickup device to the return light. Return after passing through sensor lens 17 The light enters the optical axis adjusting element 18.
- the optical axis adjusting element 18 has an action of changing the optical axis direction of the return light having at least one wavelength among the three different types of return light having the wavelengths ⁇ ⁇ , 12 and ⁇ 3. Specifically, the optical axis direction of the return light of wavelength 2 is changed by the diffractive action of the diffraction grating 19 provided in the optical axis adjusting element 18, and thereby the return light of wavelengths ⁇ ⁇ , 12 and ⁇ 3 is changed. Is received by the common photodetector 20! /
- the return light of wavelengths ⁇ 1 and ⁇ 3 has an optical axis whose optical axis passes through the center of the collimating lens 13 or the objective lens 15 (system optical axis of the optical pickup device: reference to FIGS. 2 and 3).
- the light travels so as to substantially coincide with the light beam, passes through the optical axis adjusting element 18 and enters the photodetector 20.
- the light emitting portion 5 (FIG. 1) of the semiconductor substrate 2 that emits light of wavelength ⁇ 2 is disposed at a position slightly separated from the light emitting portions 4 and 6 (FIG. 1) of wavelengths ⁇ 1 and ⁇ 3.
- the return light of wavelength 2 is incident on the optical axis adjustment element 18 with its optical axis shifted from the system optical axis ⁇ ⁇ ⁇ , and is reflected by a noisy blazed diffraction grating 19 provided on the optical axis adjustment element 18. After being diffracted, it enters the light detector 20. That is, any of the return lights having wavelengths ⁇ ⁇ , 12 and ⁇ 3 can be received by the photodetector 20 and signal detection can be performed.
- FIG. 4 is a diagram for explaining the operation of the binary blazed diffraction grating 19 provided in the optical axis adjusting element 18 of the optical pickup device according to the first embodiment.
- FIG. 5 is a diagram showing a configuration of the binary blazed diffraction grating 19.
- the optical path of light of each wavelength incident on the optical detector 20 is indicated by the symbol L.
- the binary blazed diffraction grating 19 has a blazed grating surface formed on its entrance surface or exit surface (here, exit surface) in a step shape.
- the height (depth) per step of the diffraction grating 19 is defined as a step d.
- the number of steps of the diffraction grating 19 (including the bottom of the grating) is defined as the number of levels P.
- the return lights having wavelengths ⁇ ⁇ and ⁇ 3 pass through substantially the same optical path, A grating plane 19a of the diffraction grating 19 is incident on a plane perpendicular to the incident surface 19b (FIG. 5) of the Nalibraise diffraction grating 19 (hereinafter simply referred to as the diffraction grating 19).
- FIG. 5 The 0th-order diffracted light of the return light having the wavelengths ⁇ 1 and ⁇ 3 is incident on the detection surface of the photodetector 20 perpendicularly and at the same position.
- the return light of wavelength ⁇ 2 passes through the optical path deviated from the optical axis of the return light of wavelengths ⁇ 1 and ⁇ 3 and enters the incident surface 19b (FIG. 5) of the diffraction grating 19 at a constant incident angle.
- Incident light is emitted from the grating surface 19a of the diffraction grating 19 (FIG. 5).
- the first-order diffracted light of the return light of wavelength 2 is incident on the photodetector 20 at a constant incident angle (different from the incident angle on the diffraction grating 19).
- the optical axis direction of the incident light (return of wavelengths ⁇ 1, ⁇ 3) is indicated as indicated by arrows in FIG.
- the light receiving position of the return light of wavelength ⁇ 2 in the detection plane of the photodetector 20 (in the plane perpendicular to the optical axis of the incident light).
- the 0th-order diffracted light is used for the return light of the wavelengths ⁇ 1 and ⁇ 3
- the light receiving position on the optical detector 20 Will not change.
- the receiving position of the return light with the wavelength ⁇ 2 can be matched with the receiving position on the photodetector 20 for the returning light with the wavelengths ⁇ 1 and ⁇ 3.
- the wavelength ⁇ 1 is 405 nm
- the wavelength ⁇ 3 is 780 nm
- the order m is 1
- the refractive index of the diffraction grating 19 is determined based on the refractive index data equivalent to BK7, which is a general glass material. From (1), the level difference d is about 1.53 / zm. Based on this, in the present embodiment, the step d of the diffraction grating 19 is set to 1.53 m.
- the optical path length difference due to the step d is an integral multiple of the wavelength, so the maximum 0 It is possible to obtain the next diffraction efficiency.
- the wavelength ⁇ 1 is 405 nm and the wavelength ⁇ 3 is 780 nm, the wavelength it is about 1.92, which is almost 2. Therefore, if the step d is set so that the optical path length difference is an integral multiple of the wavelength 3, the wavelength ⁇ 1 is almost an integral multiple, and the wavelength ⁇ 1 or ⁇ 3 However, 0th-order diffraction efficiency can be obtained.
- the refractive index of a material such as glass or plastic slightly increases as the wavelength decreases.
- n 1.53 for a wavelength of 405 nm
- n 1.51 for a force wavelength of 780 nm.
- the step d of the diffraction grating 19 is set to an integer multiple of ⁇ 3 ⁇ ( ⁇ 3 ⁇ 1) so that the maximum zero-order diffraction efficiency of the wavelength 3 is obtained, the maximum 0 next time of the wavelength ⁇ 1 is obtained. It approaches the step that yields folding efficiency, that is, an integral multiple of ⁇ 1Z (nl ⁇ 1). As a result, a high zero-order diffraction efficiency can be obtained even for the shifts of the wavelengths ⁇ 1 and ⁇ 3.
- the maximum diffraction efficiency obtained varies depending on the number of levels ⁇ .
- Fig. 6 to Fig. 12 show the groove depth h when the Revenor number ⁇ of the diffraction grating 19 is changed to seven ways of 2, 3, 4, 5, 6, 7, and 8. The relationship with the calculated value of the diffraction efficiency of each return light is shown. In the calculation, the refractive index data of BK7, a common glass material, was used as the refractive index data.
- FIG. 13 shows the number of levels ⁇ and the wavelength ⁇ 2 when the 0th-order diffracted light of wavelengths ⁇ 1 and ⁇ 3 is almost maximum.
- the return light of at least one wavelength (here, wavelength ⁇ 2) among the return lights of wavelengths ⁇ 1, ⁇ 2, ⁇ 3 reflected by the optical recording medium.
- the photodetector of the return light having the wavelengths ⁇ 1 and ⁇ 3 is used. 20 Change the light receiving position on In addition, the diffraction grating 19 and the photodetector 20 can be moved in the optical axis direction of the incident light. Therefore, by adjusting the movement of the diffraction grating 19 and the photodetector 20, it is possible to make the light receiving position of the return light of the wavelength ⁇ 1 and ⁇ 3 coincide with the light receiving position of the return light of the wavelength ⁇ 2. it can. As a result, the optical axis adjustment for guiding the return light of the wavelengths ⁇ 1, 12 and ⁇ 3 to the common photodetector 20 can be performed by a simple method.
- 0th-order diffracted light having a wavelength of ⁇ 1 (about 405 nm) and a wavelength of ⁇ 3 (about 780 nm) is used.
- ⁇ 1 about 405 nm
- ⁇ 3 about 780 nm
- the step d of the diffraction grating 19 is set to d ⁇ m 3Z (n3-1) (n3 is the refractive index with respect to the wavelength ⁇ 3 of the diffraction grating, m is an integer of 1 or more), The maximum zero-order diffraction efficiency can be obtained at wavelength ⁇ 3.
- the wavelength ratio is about 1.92, which is almost 2. Therefore, if the step d is set so that the optical path length difference is an integral multiple of the wavelength ⁇ 3, the value is almost an integral multiple of the wavelength ⁇ 1 and is high at both wavelengths ⁇ 1 and ⁇ 3. Efficiency can be obtained. As a result, good signal detection of the return light with wavelengths ⁇ 1 and X 3 can be performed.
- FIG. 14 is a perspective view showing a configuration of a three-wavelength integrated laser output device 9 (hereinafter simply referred to as laser output device 9) according to Embodiment 2 of the present invention.
- the configuration of the laser output device 9 is different from that of the first embodiment described above.
- Components other than the laser output device 9 of the optical pickup device according to the present embodiment are configured in the same manner as in the first embodiment.
- the laser output device 9 in the present embodiment includes a monolithic semiconductor substrate in which the light emitting portions (laser diodes) 5 and 6 are formed on the semiconductor substrate 1 in which the light emitting portion (laser diode) 4 is formed. 7 is pasted into one package. Shaped on semiconductor substrate 1 The light emitting part 4 and the light emitting parts 5 and 6 formed on the semiconductor substrate 7 are applied with an applied voltage [wavelength X 1 (about 405 nm), wavelength ⁇ 2 (about 650 nm), wavelength ⁇ 3 (about (780nm) light is emitted.
- the semiconductor substrates 1 and 7 are arranged so that the light emission position in the light emitting section 4 and the light emission position in the light emitting section 6 are substantially the same in view of the optical axis direction force of the light emitted from the laser output device 9. It is pasted.
- the light emitting portion 5 of the monolithic semiconductor substrate 7 is formed such that the light emission position is separated from the light emission position force of the light emitting portions 4 and 6, for example, 1 10 ⁇ m.
- FIG. 15 is a perspective view showing another configuration example of the laser output device 9 according to the second embodiment.
- the laser output device 9 shown in FIG. 15 includes a semiconductor substrate 3 on which a light emitting part (laser diode) 6 is formed on a monolithic semiconductor substrate 8 on which light emitting parts (laser diodes) 4 and 5 are formed. They are pasted together to form a single knocker.
- the light emitting portions 4 and 5 formed on the semiconductor substrate 8 and the light emitting portion 6 formed on the semiconductor substrate 3 are applied with voltage, respectively, so that the wavelength ⁇ 1 (about 405 nm) and the wavelength ⁇ 2 (about 650 nm) are applied. ) And light of wavelength ⁇ 3 (about 780 nm).
- the light emission position in the light emitting part 4 and the light emission position in the light emitting part 6 are substantially the same as seen from the direction of the optical axis of the light emitted from the laser output unit 9. It is pasted like this.
- the light emitting portion 5 of the monolithic semiconductor substrate 8 is formed so that the light emission position thereof is separated from the light emission position force of the light emitting portions 4 and 6, for example, 110 m.
- the emission position of the light having the wavelength ⁇ 1 and the emission position of the light having the wavelength 3 are the same as the emission light of the laser output device 9. Since they are formed in substantially the same Cf standing as seen from the direction of the optical axis, the same effect as in the first embodiment can be obtained.
- the level number P of the diffraction grating 19 of the optical axis adjusting element 18 is set to 5.
- the level number P of the diffraction grating 19 is in the range of 4-6. It is set.
- Other configurations of the optical pickup device according to the present embodiment can be configured in the same manner as in the first embodiment described above.
- the configuration of the diffraction grating 19 shown in FIG. 5 described above is the number of levels P in this embodiment. This corresponds to the configuration when 5.
- the 0th-order diffraction efficiency and the 1st-order diffraction efficiency at each wavelength change as shown in FIGS.
- the relationship shown in FIG. 13 exists between the number of levels P and the 1st-order diffraction efficiency of wavelength 2 when the 0th-order diffracted light of wavelengths ⁇ 1 and ⁇ 3 is almost maximum.
- the refractive index of the diffraction grating 19 is calculated using refractive index data corresponding to ⁇ 7, which is a general glass material.
- the first-order diffraction efficiency of Wavelength 2 (when the 1st-order diffraction efficiency of 1 1 and ⁇ 3 is maximized) is 0.7 or more, and a high 1st-order diffraction efficiency is obtained.
- the photodetector 20 can perform good signal detection. It becomes possible.
- the return light of wavelengths ⁇ 1 and ⁇ 3 can be used. Even with the return light having the wavelength of ⁇ 2, a high diffraction efficiency can be obtained, which makes it possible to perform good signal detection in the photodetector 20.
- the refractive index of the diffraction grating 19 of the optical axis adjustment element 18 is equivalent to the refractive index of ⁇ 7, which is a general glass material.
- the material of the diffraction grating 19 A material having a refractive index satisfying the following conditions is selected.
- Other configurations of the optical pickup device according to the present embodiment are the same as those of the first embodiment described above.
- the material of the diffraction grating 19 of the optical axis adjusting element 18 is nl as the refractive index for the wavelength ⁇ 1 of the material and ⁇ 3 as the refractive index for the wavelength ⁇ 3,
- the wavelength ⁇ 1 is described as about 405 nm
- the wavelength ⁇ 3 is described as about 780 nm.
- the maximum zero-order diffraction efficiency is obtained when the step d of the diffraction grating 19 is an integral multiple of ⁇ / ( ⁇ -1).
- the step d is an integer multiple of ⁇ 1 / (nl 1)
- the optimum step d for the wavelength ⁇ 3 is an integer multiple of ⁇ 3 / ( ⁇ 3 1).
- the value of ⁇ 3 ⁇ ⁇ 1 is about 2. Considering the difference between the power refractive index nl and n3,
- the binary blazed diffraction grating 19 is formed of a material satisfying 1.0 ⁇ (nl-l) / (n3-l) ⁇ l.08. Therefore, even when a laser output device with a wide output wavelength is used, high zero-order diffraction efficiency can be obtained at both wavelengths ⁇ 1 and ⁇ 3, and good signal detection can be achieved at the photodetector 20. Can be performed.
- FIG. 16 is a diagram showing a basic configuration of an optical disc apparatus according to Embodiment 5 of the present invention.
- the optical disk device according to the present embodiment includes an optical pickup device 100.
- the optical pickup device 100 any one of the optical pickup devices according to the first to fourth embodiments may be used.
- the optical disk device is a circuit that holds and rotates a DVD, a CD, or a blue-violet laser optical disk (optical disk 16) having a capacity several times larger than these.
- a rolling drive mechanism 102 is provided.
- the rotation drive mechanism 102 positions and rotates the optical disc 16 with reference to a chucking hole 16a provided at the center of the optical disc 16.
- the optical pickup device 100 is disposed with the objective lens facing the signal recording surface of the optical disk 16 that is rotationally driven by the rotational drive mechanism 102, and moves in the radial direction of the optical disk 16 by the feed mechanism 103. .
- the optical pickup device 100, the rotation drive mechanism 102, and the feeding mechanism 103 are controlled by a control circuit 101.
- the optical pickup device 100 has 16 types of optical discs (optical discs for DVD, CD or blue-violet laser) among the three wavelengths ⁇ , 12 and ⁇ 3 that can be emitted by the laser output device 9 (Fig. 1). Information is written to and / or read from the optical disc 16 using light having a wavelength selected according to the above.
- the signal read from the optical disk 16 by the optical pickup device 100 is demodulated by the demodulation circuit 105.
- the optical disk device is configured using the optical pickup device described in the first to fourth embodiments, so that the optical disk device can be reduced in size and cost.
- the wavelengths ⁇ ⁇ , ⁇ 2, and ⁇ 3 are about 405 nm, about 650 nm, and about 780 nm, respectively. Depending on the type of optical recording medium used, You can use the combination of!
- the binary blazed diffraction grating 19 is used.
- the present invention is not limited to the noisy blazed diffraction grating, and the return light of wavelengths ⁇ 1, 12 and ⁇ 3 is shared. If it is an optical axis adjustment element that can adjust the optical axis of the return light of at least one wavelength so that it can be received by the optical detector 20 of the optical detector.
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Head (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112006001347T DE112006001347B4 (de) | 2005-05-26 | 2006-04-24 | Optische Aufnahmevorrichtung und optische Plattenvorrichtung |
JP2006521747A JPWO2006126357A1 (ja) | 2005-05-26 | 2006-04-24 | 光ピックアップ装置及び光ディスク装置 |
CN2006800182145A CN101185131B (zh) | 2005-05-26 | 2006-04-24 | 光拾取装置和光盘装置 |
US11/886,588 US7652246B2 (en) | 2005-05-26 | 2006-04-24 | Optical pickup device and optical disk device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005-154103 | 2005-05-26 | ||
JP2005154103 | 2005-05-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006126357A1 true WO2006126357A1 (ja) | 2006-11-30 |
Family
ID=37451785
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/308519 WO2006126357A1 (ja) | 2005-05-26 | 2006-04-24 | 光ピックアップ装置及び光ディスク装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US7652246B2 (ja) |
JP (1) | JPWO2006126357A1 (ja) |
KR (1) | KR100915490B1 (ja) |
CN (1) | CN101185131B (ja) |
DE (1) | DE112006001347B4 (ja) |
WO (1) | WO2006126357A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8018799B2 (en) | 2005-11-01 | 2011-09-13 | Mitsubishi Electric Corporation | Optical pickup device and optical disc device |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5178339B2 (ja) * | 2008-06-20 | 2013-04-10 | 三洋電機株式会社 | 光ピックアップ装置 |
JP2017188596A (ja) * | 2016-04-07 | 2017-10-12 | 三菱電機株式会社 | 光モジュール |
Citations (5)
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JPH07211991A (ja) * | 1993-12-29 | 1995-08-11 | Xerox Corp | 多重ビーム型ダイオードレーザアレイ |
JPH11134702A (ja) * | 1997-10-30 | 1999-05-21 | Sanyo Electric Co Ltd | 光ピックアップ装置 |
JP2001256667A (ja) * | 2000-03-10 | 2001-09-21 | Sankyo Seiki Mfg Co Ltd | 光ピックアップ装置およびその受光方法 |
JP2002092933A (ja) * | 2000-07-13 | 2002-03-29 | Sharp Corp | 光ピックアップ |
JP2005327387A (ja) * | 2004-05-14 | 2005-11-24 | Sanyo Electric Co Ltd | 光ピックアップ装置 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5113387A (en) | 1989-12-12 | 1992-05-12 | Optex Corporation | Three laser optical disk drive system |
JP2001143312A (ja) | 1999-11-16 | 2001-05-25 | Sony Corp | 光学ピックアップ装置及び光ディスク装置 |
JP4167370B2 (ja) * | 1999-12-22 | 2008-10-15 | パイオニア株式会社 | 光ピックアップ装置 |
JP2001256670A (ja) | 2000-03-10 | 2001-09-21 | Sony Corp | 光学ピックアップ装置及び光ディスク装置 |
CN1299280C (zh) | 2002-01-17 | 2007-02-07 | 皇家飞利浦电子股份有限公司 | 光学扫描装置 |
JP2006209939A (ja) | 2004-12-28 | 2006-08-10 | Sanyo Electric Co Ltd | 光ピックアップ装置 |
JP2006278576A (ja) | 2005-03-28 | 2006-10-12 | Sanyo Electric Co Ltd | 半導体レーザ装置、半導体レーザ装置の製造方法および光ピックアップ装置 |
-
2006
- 2006-04-24 CN CN2006800182145A patent/CN101185131B/zh not_active Expired - Fee Related
- 2006-04-24 US US11/886,588 patent/US7652246B2/en not_active Expired - Fee Related
- 2006-04-24 DE DE112006001347T patent/DE112006001347B4/de not_active Expired - Fee Related
- 2006-04-24 WO PCT/JP2006/308519 patent/WO2006126357A1/ja active Application Filing
- 2006-04-24 JP JP2006521747A patent/JPWO2006126357A1/ja active Pending
- 2006-04-24 KR KR1020077027321A patent/KR100915490B1/ko not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH07211991A (ja) * | 1993-12-29 | 1995-08-11 | Xerox Corp | 多重ビーム型ダイオードレーザアレイ |
JPH11134702A (ja) * | 1997-10-30 | 1999-05-21 | Sanyo Electric Co Ltd | 光ピックアップ装置 |
JP2001256667A (ja) * | 2000-03-10 | 2001-09-21 | Sankyo Seiki Mfg Co Ltd | 光ピックアップ装置およびその受光方法 |
JP2002092933A (ja) * | 2000-07-13 | 2002-03-29 | Sharp Corp | 光ピックアップ |
JP2005327387A (ja) * | 2004-05-14 | 2005-11-24 | Sanyo Electric Co Ltd | 光ピックアップ装置 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8018799B2 (en) | 2005-11-01 | 2011-09-13 | Mitsubishi Electric Corporation | Optical pickup device and optical disc device |
Also Published As
Publication number | Publication date |
---|---|
DE112006001347T5 (de) | 2008-03-27 |
CN101185131B (zh) | 2011-03-16 |
DE112006001347B4 (de) | 2013-07-18 |
KR20080005291A (ko) | 2008-01-10 |
US7652246B2 (en) | 2010-01-26 |
US20090078857A1 (en) | 2009-03-26 |
JPWO2006126357A1 (ja) | 2008-12-25 |
CN101185131A (zh) | 2008-05-21 |
KR100915490B1 (ko) | 2009-09-03 |
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