JP2009283132A5 - - Google Patents

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JP2009283132A5
JP2009283132A5 JP2009203657A JP2009203657A JP2009283132A5 JP 2009283132 A5 JP2009283132 A5 JP 2009283132A5 JP 2009203657 A JP2009203657 A JP 2009203657A JP 2009203657 A JP2009203657 A JP 2009203657A JP 2009283132 A5 JP2009283132 A5 JP 2009283132A5
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Japan
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light
wavelength
linearly polarized
diffraction grating
polarized light
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JP2009203657A
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JP2009283132A (en
JP4735749B2 (en
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Publication of JP2009283132A5 publication Critical patent/JP2009283132A5/ja
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Claims (3)

波長λ１ の光および波長λ２（λ１≠λ２）の光を出射する光源と、前記波長λ １ の光および前記波長λ ２ の光を偏向するビームスプリッタと、前記波長λ １ の光および前記波長λ ２ の光を光記録媒体に集光する対物レンズと、前記光記録媒体の情報記録面で反射した信号光を受光する光検出器と、を備え、前記光記録媒体に情報の記録・再生を行う光ヘッド装置であって、
前記波長λ １ の光および前記波長λ ２ の光の偏波面が互いに平行で共通する光路中に２波長用回折素子を備え、
前記２波長用回折素子は、前記波長λ １ の光および前記波長λ ２ の光の入射側から位相板と、偏光性の回折格子を有し、
前記位相板は、前記波長λ １ の光と前記波長λ ２ の光うち、いずれか一方の光に対して２π・（ｍ １ −１／２）の位相差を発生して（ｍ １ は自然数）前記第１の直線偏光と直交する第２の直線偏光を出射するとともに、他方の光に対して２π・ｍ ２ の位相差を発生して（ｍ ２ は自然数）前記第１の直線偏光を出射し、
前記偏光性の回折格子は、第１の偏光性の回折格子と、第２の偏光性の回折格子と、を有し、
前記第１の偏光性の回折格子は、前記第１の直線偏光と前記第２の直線偏光のうち、いずれか一方を回折させずに透過させるとともに、他方を回折させ、
前記第２の偏光性の回折格子は、前記第１の直線偏光と前記第２の直線偏光のうち、前記第１の偏光性の回折格子で回折させる方の直線偏光を回折させずに透過させるとともに、他方を回折させる光ヘッド装置。 Light source, a beam splitter for deflecting the wavelength lambda 1 of light and the wavelength lambda 2 of light, the wavelength lambda 1 of light for emitting light having a wavelength lambda 1 of light and the wavelength λ 2 (λ 1 ≠ λ 2 ) And an objective lens for condensing the light of wavelength λ 2 onto the optical recording medium, and a photodetector for receiving the signal light reflected by the information recording surface of the optical recording medium, An optical head device for recording / reproducing,
Comprising a diffraction element for two wavelengths in an optical path polarization of the wavelength lambda 1 of light and the wavelength lambda 2 of light is common parallel to each other,
The two-wavelength diffraction element has a phase plate and a polarizing diffraction grating from the incident side of the light of wavelength λ 1 and the light of wavelength λ 2 ,
The phase plate generates a phase difference of 2π · (m 1 −1/2) with respect to one of the light with the wavelength λ 1 and the light with the wavelength λ 2 (m 1 is a natural number). ) The second linearly polarized light orthogonal to the first linearly polarized light is emitted, and a phase difference of 2π · m 2 is generated with respect to the other light (m 2 is a natural number). Exit,
The polarizing diffraction grating has a first polarizing diffraction grating and a second polarizing diffraction grating,
The first polarizing diffraction grating transmits either one of the first linearly polarized light and the second linearly polarized light without diffracting, and diffracts the other,
The second polarizing diffraction grating transmits the linearly polarized light diffracted by the first polarizing diffraction grating out of the first linearly polarized light and the second linearly polarized light without being diffracted. An optical head device that diffracts the other. 前記偏光性の回折格子は、階段状またはブレーズ状に形成され複屈折性材料からなる偏向機能層を有し、前記第１の直線偏光と前記第２の直線偏光のうち、いずれか一方を回折させずに透過させるとともに、他方を回折させて前記波長λThe polarizing diffraction grating has a deflecting function layer formed of a birefringent material formed in a stepped shape or a blazed shape, and diffracts one of the first linearly polarized light and the second linearly polarized light. The wavelength λ １1 の光と前記波長λLight and the wavelength λ ２2 の光の光軸をそろえる請求項１に記載の光ヘッド装置。2. The optical head device according to claim 1, wherein the optical axes of the light beams are aligned. 前記波長λThe wavelength λ １1 は、ＤＶＤ系の６５０ｎｍ波長帯であり、波長λIs the 650 nm wavelength band of the DVD system and the wavelength λ ２2 は、ＣＤ系の７９０ｎｍ波長帯である請求項１または請求項２に記載の光ヘッド装置。The optical head device according to claim 1, wherein is a CD-based 790 nm wavelength band.
JP2009203657A 2000-01-31 2009-09-03 Optical head device Expired - Fee Related JP4735749B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2009203657A JP4735749B2 (en) 2000-01-31 2009-09-03 Optical head device

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2000021363 2000-01-31
JP2000021363 2000-01-31
JP2009203657A JP4735749B2 (en) 2000-01-31 2009-09-03 Optical head device

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP2000218976A Division JP4560906B2 (en) 2000-01-31 2000-07-19 Optical head device

Publications (3)

Publication Number Publication Date
JP2009283132A JP2009283132A (en) 2009-12-03
JP2009283132A5 true JP2009283132A5 (en) 2010-07-29
JP4735749B2 JP4735749B2 (en) 2011-07-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP2009203657A Expired - Fee Related JP4735749B2 (en) 2000-01-31 2009-09-03 Optical head device

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JP (1) JP4735749B2 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3208297B2 (en) * 1995-09-29 2001-09-10 三洋電機株式会社 Optical pickup
JPH10214431A (en) * 1997-01-30 1998-08-11 Matsushita Electric Ind Co Ltd Optical head device
JPH11174226A (en) * 1997-12-09 1999-07-02 Ricoh Co Ltd Polarizing hologram and optical head using the same

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