JP2001108894A5 - - Google Patents
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- JP2001108894A5 JP2001108894A5 JP1999287765A JP28776599A JP2001108894A5 JP 2001108894 A5 JP2001108894 A5 JP 2001108894A5 JP 1999287765 A JP1999287765 A JP 1999287765A JP 28776599 A JP28776599 A JP 28776599A JP 2001108894 A5 JP2001108894 A5 JP 2001108894A5
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- JP
- Japan
- Prior art keywords
- optical system
- pickup device
- lens
- optical pickup
- coupling
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- 230000003287 optical Effects 0.000 description 62
- 230000001808 coupling Effects 0.000 description 20
- 238000010168 coupling process Methods 0.000 description 20
- 238000005859 coupling reaction Methods 0.000 description 20
- 230000004075 alteration Effects 0.000 description 10
- 239000000463 material Substances 0.000 description 3
- 229910002601 GaN Inorganic materials 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Description
【特許請求の範囲】
【請求項１】
少なくとも１つの光源と、前記光源から出射された発散光の発散角を変換するカップリング光学系と、前記カップリング光学系からの光束を光情報記録媒体の情報記録媒面に集光する対物レンズ光学系とを備えている光ピックアップ装置において、
前記対物レンズ光学系に所定の波長の光とは所定の波長差だけ異なる波長の光を入射させた際の軸上色収差に対して、前記カップリング光学系に前記所定の波長差だけ異なる波長の光を入射させて前記対物レンズ光学系を介した際の軸上色収差を小さくする回折面を、前記カップリング光学系の少なくとも１つの面に設けたことを特徴とする光ピックアップ装置。
【請求項２】
前記対物レンズ光学系が２枚のレンズからなり、前記２枚のレンズに少なくとも１面の非球面屈折面が含まれていることを特徴とする請求項１に記載の光ピックアップ装置。
【請求項３】
前記対物レンズ光学系の光情報記録媒体側の開口数が０．６５以上であることを特徴とする請求項２に記載の光ピックアップ装置。
【請求項４】
前記光源の波長λが４５０ｎｍ以下であるとともに、前記回折面が略同心円状の回折パターンを有しており、前記回折パターンの最小ピッチΛminが、２λ＜Λmin＜３０λを満たす値であることを特徴とする請求項１〜３のいずれか１項に記載の光ピックアップ装置。
【請求項５】
請求項１〜４のいずれか１項に記載の光ピックアップ装置に適用可能であることを特徴とする光ピックアップ用光学系。
【請求項６】
請求項５に記載の光ピックアップ用光学系に適用可能であることを特徴とするカップリング光学系。
【請求項７】
略同心円状の回折パターンをもつ回折面を少なくとも一方の面に有しており、前記回折パターンの最小ピッチΛminが０．４μｍ＜Λmin＜１３．５μｍを満たす値であることを特徴とするカップリング光学系用レンズ。
【請求項８】
波長λが４００ｎｍの光を入射させた際に、焦点距離ｆが２ｍｍ＜ｆ＜２５ｍｍを満足する値であることを特徴とする請求項７に記載のカップリング光学系用レンズ。
【請求項９】
略同心円状の回折パターンをもつ回折面を少なくとも一方の面に有するレンズであって、前記レンズと同じ材料、同じ軸上厚、同じ焦点距離、および、同じバックフォーカスを有し且つ回折面をもたない屈折レンズと比較して軸上色収差の絶対値が大きく且つ符号が反対であることを特徴とするレンズ。
【請求項１０】
請求項９に記載のレンズを有することを特徴とするカップリング光学系。
【請求項１１】
請求項１〜４のいずれか１項に記載の光ピックアップ装置を搭載しており、音声および画像の少なくともいずれか一方を記録または再生することが可能であることを特徴とする記録再生装置。
[Claims]
[Claim 1 ]
At least one light source, a coupling optical system that converts the divergence angle of the divergent light emitted from the light source, and an objective lens that collects the light beam from the coupling optical system on the information recording medium surface of the optical information recording medium. In an optical pickup device equipped with an optical system,
With respect to axial chromatic aberration when light of a wavelength different from that of a predetermined wavelength is incident on the objective lens optical system by a predetermined wavelength difference, the coupling optical system has a wavelength different from that of the predetermined wavelength difference. An optical pickup device characterized in that a diffraction surface that reduces axial chromatic aberration when light is incident through the objective lens optical system is provided on at least one surface of the coupling optical system.
2.
The optical pickup device according to claim 1 , wherein the objective lens optical system is composed of two lenses, and the two lenses include at least one aspherical refracting surface.
3.
The optical pickup device according to claim 2 , wherein the numerical aperture of the objective lens optical system on the optical information recording medium side is 0.65 or more.
4.
The wavelength λ of the light source is 450 nm or less, the diffraction surface has a substantially concentric diffraction pattern, and the minimum pitch Λmin of the diffraction pattern is a value satisfying 2λ <Λmin <30λ. The optical pickup device according to any one of claims 1 to 3.
5.
An optical system for an optical pickup, which is applicable to the optical pickup device according to any one of claims 1 to 4.
6.
A coupling optical system that is applicable to the optical pickup optical system according to claim 5.
7.
A coupling characterized in that a diffraction surface having a substantially concentric diffraction pattern is provided on at least one surface, and the minimum pitch Λmin of the diffraction pattern is a value satisfying 0.4 μm <Λmin <13.5 μm. Lens for optical system.
8.
The lens for a coupling optical system according to claim 7 , wherein the focal length f is a value satisfying 2 mm <f <25 mm when light having a wavelength λ of 400 nm is incident.
9.
A lens having a diffractive surface having a substantially concentric diffraction pattern on at least one surface, having the same material, the same axial thickness, the same focal length, and the same back focus as the lens, and also having a diffractive surface. A lens characterized in that the absolute value of axial chromatic aberration is larger and the sign is opposite to that of a refracting lens.
10.
A coupling optical system comprising the lens according to claim 9.
11.
A recording / playback device including the optical pickup device according to any one of claims 1 to 4 , wherein at least one of audio and image can be recorded or reproduced.
そこで、本発明の請求項１の光ピックアップ装置は、少なくとも１つの光源と、前記光源から出射された発散光の発散角を変換するカップリング光学系と、前記カップリング光学系からの光束を光情報記録媒体の情報記録媒面に集光する対物レンズ光学系とを備えている光ピックアップ装置において、前記対物レンズ光学系に所定の波長の光とは所定の波長差だけ異なる波長の光を入射させた際の軸上色収差に対して、前記カップリング光学系に前記所定の波長差だけ異なる波長の光を入射させて前記対物レンズ光学系を介した際の軸上色収差を小さくする回折面を、前記カップリング光学系の少なくとも１つの面に設けたことを特徴とするものである。 Therefore, the optical pickup device according to claim 1 of the present invention emits light from at least one light source, a coupling optical system that converts the divergence angle of the divergent light emitted from the light source, and a light beam from the coupling optical system. In an optical pickup device provided with an objective lens optical system that collects light on the information recording medium surface of an information recording medium, light having a wavelength different from that of a predetermined wavelength is incident on the objective lens optical system by a predetermined wavelength difference. A diffraction surface that reduces the axial chromatic aberration when light having a wavelength different by the predetermined wavelength difference is incident on the coupling optical system with respect to the axial chromatic aberration when the light is passed through the objective lens optical system. , The coupling optical system is provided on at least one surface.
このように、請求項１の光ピックアップ装置によると、カップリング光学系の少なくとも１つの面に回折面が設けられているので、回折面によって生じる軸上色収差を、対物レンズ光学系の屈折面によって生じる軸上色収差に対して、逆符号でかつ（１／ｍＴ）2倍の関係が成立するようにすれば、対物レンズ光学系によって発生する軸上色収差をカップリング光学系により補正することができる。カップリング光学系には、上述したような対物レンズ光学系についての種々の制限が存在しないので、カップリング光学系をプラスティックなどの樹脂材料によって射出成型などで製造することが可能となる。従って、光ピックアップ装置を低コストで容易に製造することができるようになる。 As described above, according to the optical pickup device of claim 1, since the diffraction surface is provided on at least one surface of the coupling optical system, the axial chromatic aberration caused by the diffraction surface is caused by the refraction surface of the objective lens optical system. with respect to the axial chromatic aberration caused, if so and the opposite sign (1 / mT) 2 times the relationship is established, it is possible to correct axial chromatic aberration generated by the objective lens optical system by coupling optical system .. Since the coupling optical system does not have various restrictions on the objective lens optical system as described above, the coupling optical system can be manufactured by injection molding or the like using a resin material such as plastic. Therefore, the optical pickup device can be easily manufactured at low cost.
つまり、請求項１の光ピックアップ装置によると、波長４００ｎｍ程度のＧａＮ青色半導体レーザのような単色性が悪い光源或いは波長が急激に変動する光源が用いられた場合であっても軸上色収差を補正することができる光ピックアップ装置を容易且つ低コストで製造可能となる。 That is, according to the optical pickup device of claim 1, even when a light source having poor monochromaticity such as a GaN blue semiconductor laser having a wavelength of about 400 nm or a light source whose wavelength fluctuates rapidly is used, axial chromatic aberration is corrected. The optical pickup device that can be used can be manufactured easily and at low cost.
請求項２の光ピックアップ装置は、前記対物レンズ光学系が２枚のレンズからなり、前記２枚のレンズに少なくとも１面の非球面屈折面が含まれていることを特徴とするものである。 The optical pickup device according to claim 2 is characterized in that the objective lens optical system is composed of two lenses, and the two lenses include at least one aspherical refracting surface.
請求項３の光ピックアップ装置は、前記対物レンズ光学系の光情報記録媒体側の開口数が０．６５以上であることを特徴とするものである。 The optical pickup device according to claim 3 is characterized in that the numerical aperture of the objective lens optical system on the optical information recording medium side is 0.65 or more.
請求項４の光ピックアップ装置は、前記光源の波長λが４５０ｎｍ以下であるとともに、前記回折面が略同心円状の回折パターンを有しており、前記回折パターンの最小ピッチΛminが、２λ＜Λmin＜３０λを満たす値であることを特徴とするものである。 The optical pickup device according to claim 4 has a wavelength λ of the light source of 450 nm or less and a diffraction pattern in which the diffraction planes are substantially concentric, and the minimum pitch Λmin of the diffraction pattern is 2λ <Λmin <. It is characterized in that it is a value satisfying 30λ.
また、請求項５は、請求項１〜４のいずれか１項に記載の光ピックアップ装置に適用可能であることを特徴とする光ピックアップ用光学系である。 Further, claim 5 is an optical pickup optical system, which is applicable to the optical pickup device according to any one of claims 1 to 4.
また、請求項６は、請求項５に記載の光ピックアップ用光学系に適用可能であることを特徴とするカップリング光学系である。 A sixth aspect of the present invention is a coupling optical system that is applicable to the optical pickup optical system according to the fifth aspect.
請求項７のカップリング光学系用レンズは、略同心円状の回折パターンをもつ回折面を少なくとも一方の面に有しており、前記回折パターンの最小ピッチΛminが０．４μｍ＜Λmin＜１３．５μｍを満たす値であることを特徴とするものである。 The lens for a coupling optical system according to claim 7 has a diffraction surface having a substantially concentric diffraction pattern on at least one surface, and the minimum pitch Λmin of the diffraction pattern is 0.4 μm <Λmin <13.5 μm. It is characterized in that it is a value that satisfies.
請求項８のカップリング光学系用レンズは、波長λが４００ｎｍの光を入射させた際に、焦点距離ｆが２ｍｍ＜ｆ＜２５ｍｍを満足する値であることを特徴とするものである。 The coupling optical system lens according to claim 8 is characterized in that the focal length f satisfies 2 mm <f <25 mm when light having a wavelength λ of 400 nm is incident.
また、請求項９は、略同心円状の回折パターンをもつ回折面を少なくとも一方の面に有するレンズであって、前記レンズと同じ材料、同じ軸上厚、同じ焦点距離、および、同じバックフォーカスを有し且つ回折面をもたない屈折レンズと比較して軸上色収差の絶対値が大きく且つ符号が反対であることを特徴とするレンズである。 Further, claim 9 is a lens having a diffraction surface having a substantially concentric diffraction pattern on at least one surface, and has the same material, the same axial thickness, the same focal length, and the same back focus as the lens. This lens is characterized in that the absolute value of axial chromatic aberration is larger and the sign is opposite to that of a refracting lens which has and does not have a diffraction surface.
請求項１０は、請求項９に記載のレンズを有することを特徴とするカップリング光学系である。 10. The coupling optical system is characterized by having the lens according to claim 9.
請求項１１は、請求項１〜４のいずれか１項に記載の光ピックアップ装置を搭載しており、音声および画像の少なくともいずれか一方を記録または再生することが可能であることを特徴とする記録再生装置である。
11. The optical pickup device according to any one of claims 1 to 4 is installed, and at least one of audio and image can be recorded or reproduced. It is a recording / playback device.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28776599A JP2001108894A (en) | 1999-10-08 | 1999-10-08 | Optical system for optical pickup, optical pickup device, coupling optical system, lens for coupling optical system, and recording and reproducing device |
| US09/685,012 US6411587B1 (en) | 1999-10-08 | 2000-10-05 | Optical pickup optical system, optical pickup apparatus, coupling optical system, coupling optical system lens and recording/reproduction apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28776599A JP2001108894A (en) | 1999-10-08 | 1999-10-08 | Optical system for optical pickup, optical pickup device, coupling optical system, lens for coupling optical system, and recording and reproducing device |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2010259867A Division JP4985839B2 (en) | 2010-11-22 | 2010-11-22 | Optical pickup device and collimating lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001108894A JP2001108894A (en) | 2001-04-20 |
| JP2001108894A5 true JP2001108894A5 (en) | 2006-11-16 |
Family
ID=17721475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28776599A Pending JP2001108894A (en) | 1999-10-08 | 1999-10-08 | Optical system for optical pickup, optical pickup device, coupling optical system, lens for coupling optical system, and recording and reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001108894A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2001294248A1 (en) | 2000-10-16 | 2002-04-29 | Konica Corporation | Objective lens, coupling lens, light converging optical system, and optical pick-up apparatus |
| JP4621965B2 (en) * | 2001-06-20 | 2011-02-02 | コニカミノルタホールディングス株式会社 | Optical system for optical pickup, optical pickup device and recording / reproducing device |
| JP2004185797A (en) * | 2002-11-21 | 2004-07-02 | Konica Minolta Holdings Inc | Optical system for optical pickup device, optical pickup device, and objective lens |
| US7848208B2 (en) | 2006-10-05 | 2010-12-07 | Panasonic Corporation | Optical head device, aberration correction method and optical information processing apparatus |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3340489B2 (en) * | 1993-01-14 | 2002-11-05 | 旭光学工業株式会社 | Optical system and chromatic aberration correction element of optical information recording / reproducing device |
| JPH06347693A (en) * | 1993-04-16 | 1994-12-22 | Matsushita Electric Ind Co Ltd | Diffraction grating incorporated type lens and optical head device therefor |
-
1999
- 1999-10-08 JP JP28776599A patent/JP2001108894A/en active Pending
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