JP2007299486A5 - - Google Patents

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JP2007299486A5
JP2007299486A5 JP2006127768A JP2006127768A JP2007299486A5 JP 2007299486 A5 JP2007299486 A5 JP 2007299486A5 JP 2006127768 A JP2006127768 A JP 2006127768A JP 2006127768 A JP2006127768 A JP 2006127768A JP 2007299486 A5 JP2007299486 A5 JP 2007299486A5
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objective lens
refractive index
material constituting
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optical
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Claims (9)

光記録媒体に対して、波長が略４０５ｎｍの光ビームによって情報信号の記録再生を行う光ピックアップに用いられ、
入射側及び出射側の面のいずれもが非球面形状とされ、
開口数（ＮＡ）が０．８以上であり、
次式（１）及び次式（２）を満たす対物レンズ。
Figure 2007299486
 但し、
Ｎｇ：対物レンズを構成する材料のｇ線における屈折率、
Ｎｈ：対物レンズを構成する材料のｈ線における屈折率、
Ｎｉ：対物レンズを構成する材料のｉ線における屈折率、
ｆ：対物レンズの焦点距離（ｍｍ）、
ｄ：対物レンズの光軸位置での光軸方向の厚み（ｍｍ）、
ｎ：対物レンズを構成する材料の使用波長における屈折率
である。 With respect to the optical recording medium, the wavelength is found using an optical pickup for recording and reproducing information signals by approximately 405nm light beam,
Both the incident side and emission side surfaces are aspherical,
The numerical aperture (NA) is 0.8 or more,
Following formula (1) and an objective lens that meets the following equation (2).
Figure 2007299486
 However,
Ng: Refractive index at the g-line of the material constituting the objective lens,
Nh: the refractive index of the material constituting the objective lens at the h-line,
Ni: Refractive index at the i-line of the material constituting the objective lens,
f: Focal length (mm) of the objective lens,
d: Thickness (mm) in the optical axis direction at the optical axis position of the objective lens,
n: Refractive index at the used wavelength of the material constituting the objective lens. さらに、次式（３）を満たす請求項１記載の対物レンズ。
Figure 2007299486
 Furthermore, the objective lens of Claim 1 which satisfy | fills following Formula (3).
Figure 2007299486
 さらに、次式（４）を満たす請求項２記載の対物レンズ。
Figure 2007299486
 但し、
ｒ１：上記入射側の面の曲率半径（ｍｍ）
である。 Furthermore, the objective lens of Claim 2 which satisfy | fills following Formula (4).
Figure 2007299486
 However,
r1: Curvature radius of the incident side surface (mm)
It is. さらに、次式（５）を満たす請求項１乃至請求項３のいずれか１項に記載の対物レンズ。
Figure 2007299486
 Furthermore, the objective lens of any one of Claims 1 thru | or 3 which satisfy | fills following Formula (5).
Figure 2007299486
 光源から出射された波長が略４０５ｎｍの光ビームを光記録媒体の信号記録面上に集光する対物レンズを備え、
上記対物レンズは、入射側及び出射側の面のいずれもが非球面形状とされ、開口数（ＮＡ）が０．８以上であり、次式（６）及び次式（７）を満たす光ピックアップ。
Figure 2007299486
 但し、
Ｎｇ：対物レンズを構成する材料のｇ線における屈折率、
Ｎｈ：対物レンズを構成する材料のｈ線における屈折率、
Ｎｉ：対物レンズを構成する材料のｉ線における屈折率、
ｆ：対物レンズの焦点距離（ｍｍ）、
ｄ：対物レンズの光軸位置での光軸方向の厚み（ｍｍ）、
ｎ：対物レンズを構成する材料の使用波長における屈折率
である。 Bei example an objective lens wavelength emitted from the light source to focus the substantially 405nm light beam on the signal recording surface of the optical recording medium,
The objective lens, both surfaces of the incident side and the exit side is aspheric, the numerical aperture (NA) is not less than 0.8, the light that meets the following equation (6) and the following equation (7) pick up.
Figure 2007299486
 However,
Ng: Refractive index at the g-line of the material constituting the objective lens,
Nh: the refractive index of the material constituting the objective lens at the h-line,
Ni: Refractive index at the i-line of the material constituting the objective lens,
f: Focal length (mm) of the objective lens,
d: Thickness (mm) in the optical axis direction at the optical axis position of the objective lens,
n: Refractive index at the used wavelength of the material constituting the objective lens. 光記録媒体に対し情報信号の記録再生を行う光ピックアップを備え、
上記光ピックアップは、光源から出射された波長が略４０５ｎｍの光ビームを光記録媒体の信号記録面上に集光する対物レンズを備え、
上記対物レンズは、入射側及び出射側の面のいずれもが非球面形状とされ、開口数（ＮＡ）が０．８以上であり、次式（８）及び次式（９）を満たす光ディスク装置。
Figure 2007299486
 但し、
Ｎｇ：対物レンズを構成する材料のｇ線における屈折率、
Ｎｈ：対物レンズを構成する材料のｈ線における屈折率、
Ｎｉ：対物レンズを構成する材料のｉ線における屈折率、
ｆ：対物レンズの焦点距離（ｍｍ）、
ｄ：対物レンズの光軸位置での光軸方向の厚み（ｍｍ）、
ｎ：対物レンズを構成する材料の使用波長における屈折率
である。 An optical pickup for recording and reproducing information signals to and from an optical recording medium is provided.
The optical pickup includes an objective lens that focuses a light beam having a wavelength of about 405 nm emitted from a light source on a signal recording surface of an optical recording medium,
The objective lens, both surfaces of the incident side and the exit side is aspheric, the numerical aperture (NA) is not less than 0.8, an optical disk that meets the following equation (8) and equation (9) apparatus.
Figure 2007299486
 However,
Ng: Refractive index at the g-line of the material constituting the objective lens,
Nh: the refractive index of the material constituting the objective lens at the h-line,
Ni: Refractive index at the i-line of the material constituting the objective lens,
f: Focal length (mm) of the objective lens,
d: Thickness (mm) in the optical axis direction at the optical axis position of the objective lens,
n: Refractive index at the used wavelength of the material constituting the objective lens. 光記録媒体に対して、波長が略４０５ｎｍの光ビームによって情報信号の記録再生を行う光ピックアップに用いられ、Used for an optical pickup that records and reproduces an information signal with an optical beam having a wavelength of about 405 nm with respect to an optical recording medium,
入射側及び出射側の面のいずれもが非球面形状とされ、Both the incident side and emission side surfaces are aspherical,
開口数（ＮＡ）が０．８以上であり、The numerical aperture (NA) is 0.8 or more,
次式（１０）、次式（１１）及び次式（１２）を満たす対物レンズ。An objective lens that satisfies the following formula (10), the following formula (11), and the following formula (12).
Figure 2007299486
Figure 2007299486
 但し、However,
Ｎｇ：対物レンズを構成する材料のｇ線における屈折率、Ng: Refractive index at the g-line of the material constituting the objective lens,
Ｎｈ：対物レンズを構成する材料のｈ線における屈折率、Nh: the refractive index of the material constituting the objective lens at the h-line,
Ｎｉ：対物レンズを構成する材料のｉ線における屈折率、Ni: Refractive index at the i-line of the material constituting the objective lens,
ｆ：対物レンズの焦点距離（ｍｍ）、f: Focal length (mm) of the objective lens,
ｄ：対物レンズの光軸位置での光軸方向の厚み（ｍｍ）、d: Thickness (mm) in the optical axis direction at the optical axis position of the objective lens,
ｎ：対物レンズを構成する材料の使用波長における屈折率、n: refractive index at the wavelength used of the material constituting the objective lens,
ｒr １1 ：対物レンズの入射側の面の曲率半径（ｍｍ）: Curvature radius of the entrance side of the objective lens (mm)
である。It is. 光源から出射された波長が略４０５ｎｍの光ビームを光記録媒体の信号記録面上に集光する対物レンズを備え、An objective lens for condensing a light beam having a wavelength of about 405 nm emitted from the light source on the signal recording surface of the optical recording medium;
上記対物レンズは、入射側及び出射側の面のいずれもが非球面形状とされ、開口数（ＮＡ）が０．８以上であり、次式（１３）、次式（１４）及び次式（１５）を満たす光ピックアップ。In the objective lens, both the incident-side and emission-side surfaces are aspherical, and the numerical aperture (NA) is 0.8 or more. The following expressions (13), (14), and ( An optical pickup that satisfies 15).
Figure 2007299486
Figure 2007299486
 但し、However,
Ｎｇ：対物レンズを構成する材料のｇ線における屈折率、Ng: Refractive index at the g-line of the material constituting the objective lens,
Ｎｈ：対物レンズを構成する材料のｈ線における屈折率、Nh: the refractive index of the material constituting the objective lens at the h-line,
Ｎｉ：対物レンズを構成する材料のｉ線における屈折率、Ni: Refractive index at the i-line of the material constituting the objective lens,
ｆ：対物レンズの焦点距離（ｍｍ）、f: Focal length (mm) of the objective lens,
ｄ：対物レンズの光軸位置での光軸方向の厚み（ｍｍ）、d: Thickness (mm) in the optical axis direction at the optical axis position of the objective lens,
ｎ：対物レンズを構成する材料の使用波長における屈折率、n: refractive index at the wavelength used of the material constituting the objective lens,
ｒr １1 ：対物レンズの入射側の面の曲率半径（ｍｍ）: Curvature radius of the entrance side of the objective lens (mm)
である。It is. 光記録媒体に対し情報信号の記録再生を行う光ピックアップを備え、An optical pickup for recording and reproducing information signals to and from an optical recording medium is provided.
上記光ピックアップは、光源から出射された波長が略４０５ｎｍの光ビームを光記録媒体の信号記録面上に集光する対物レンズを備え、  The optical pickup includes an objective lens that focuses a light beam having a wavelength of about 405 nm emitted from a light source on a signal recording surface of an optical recording medium,
上記対物レンズは、入射側及び出射側の面のいずれもが非球面形状とされ、開口数（ＮＡ）が０．８以上であり、次式（１６）、次式（１７）及び次式（１８）を満たす光ディスク装置。In the objective lens, both the incident-side and emission-side surfaces are aspherical, the numerical aperture (NA) is 0.8 or more, and the following expressions (16), (17), and ( 18) an optical disk device that satisfies the above).
Figure 2007299486
Figure 2007299486
 但し、However,
Ｎｇ：対物レンズを構成する材料のｇ線における屈折率、Ng: Refractive index at the g-line of the material constituting the objective lens,
Ｎｈ：対物レンズを構成する材料のｈ線における屈折率、Nh: the refractive index of the material constituting the objective lens at the h-line,
Ｎｉ：対物レンズを構成する材料のｉ線における屈折率、Ni: Refractive index at the i-line of the material constituting the objective lens,
ｆ：対物レンズの焦点距離（ｍｍ）、f: Focal length (mm) of the objective lens,
ｄ：対物レンズの光軸位置での光軸方向の厚み（ｍｍ）、d: Thickness (mm) in the optical axis direction at the optical axis position of the objective lens,
ｎ：対物レンズを構成する材料の使用波長における屈折率、n: refractive index at the wavelength used of the material constituting the objective lens,
ｒr １1 ：対物レンズの入射側の面の曲率半径（ｍｍ）: Curvature radius of the entrance side of the objective lens (mm)
である。It is.
JP2006127768A 2006-05-01 2006-05-01 Objective lens design method Expired - Fee Related JP4463238B2 (en)

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JP2007299486A5 true JP2007299486A5 (en) 2008-10-09
JP4463238B2 JP4463238B2 (en) 2010-05-19

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JP4850032B2 (en) 2006-11-08 2012-01-11 日立マクセル株式会社 Optical pickup lens
JP2010215443A (en) * 2009-03-16 2010-09-30 Konica Minolta Opto Inc Objective lens for optical pickup device and optical pickup device

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