JP2008065124A5 - - Google Patents
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- JP2008065124A5 JP2008065124A5 JP2006243938A JP2006243938A JP2008065124A5 JP 2008065124 A5 JP2008065124 A5 JP 2008065124A5 JP 2006243938 A JP2006243938 A JP 2006243938A JP 2006243938 A JP2006243938 A JP 2006243938A JP 2008065124 A5 JP2008065124 A5 JP 2008065124A5
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- Japan
- Prior art keywords
- lens
- refractive index
- lens group
- zoom lens
- refractive power
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- 230000000875 corresponding Effects 0.000 claims 3
- 230000003287 optical Effects 0.000 claims 2
- 238000006243 chemical reaction Methods 0.000 claims 1
Claims (5)
該第２レンズ群は、光軸から垂直方向にかけて材料の屈折率が変化する屈折率分布を有する屈折率分布型レンズから構成され、
該屈折率分布は、光軸から垂直方向の距離ｈにおける波長λでの屈折率Ｎλ（ｈ）は、波長λにおけるｈ０乗、ｈ２乗、ｈ４乗・・・の係数をＮ００λ、Ｎ１０λ、Ｎ２０λ…とするとき、
Ｎλ（ｈ）＝Ｎ００λ＋Ｎ１０λ＊ｈ２＋Ｎ２０λ＊ｈ４＋…
で表されるものであり、該係数Ｎ００λに相当するｄ線に対する値をＮ００ｄとし、該屈折率分布型レンズは、材料の屈折率がＮ００ｄの薄肉均質レンズであるとしたときの屈折力をφ２ｓ、該第２レンズ群の屈折率をΦ２とするとき
−１．８５＜φ２ｓ／Φ２ ＜ １
なる条件を満足することを特徴とするズームレンズ。 In order from the object side to the image side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a positive refractive power are arranged. In a zoom lens that changes an interval between the second lens group and an interval between the second lens group and the third lens group,
The second lens group includes a refractive index distribution type lens having a refractive index distribution in which the refractive index of the material changes from the optical axis to the vertical direction.
The refractive index distribution is such that the refractive index Nλ (h) at the wavelength λ at a distance h in the vertical direction from the optical axis is the coefficients of h0, h2, h4,... At the wavelength λ, N00λ, N10λ, N20λ,. And when
Nλ (h) = N00λ + N10λ * h 2 + N20λ * h 4 +
The value for the d-line corresponding to the coefficient N00λ is N00d, and the gradient index lens has a refractive power of φ2 s when it is a thin homogeneous lens having a refractive index of N00d. When the refractive index of the second lens group is Φ2, −1.85 <φ2s / Φ2 <1
A zoom lens characterized by satisfying the following conditions:
該係数Ｎ１０λに相当するｄ，ｇ，Ｃ線に対する値を順にＮ１０ｄ，Ｎ１０ｇ，Ｎ１０Ｃとし、
これらの値に対する屈折率分布型レンズの材料のアッベ数Ｖ００ｇ，Ｖ１０ｇを
Ｖ００ｇ ＝ （Ｎ００ｄ−１）／（Ｎ００ｇ−Ｎ００Ｃ）
Ｖ１０ｇ ＝ Ｎ１０ｄ／（Ｎ１０ｇ−Ｎ１０Ｃ）
とし、該屈折率分布型レンズを材料の屈折率がＮ００ｄの薄肉均質レンズであるとしたときの屈折力をφ２ｓ、屈折率分布媒質によって生ずる屈折力をφ２ｍとするとき
−１．５＜（φ２ｓ／Ｖ００ｇ＋φ２ｍ／Ｖ１０ｇ）／（Φ２／Ｖ００ｇ）＜１
なる条件を満足することを特徴とする、請求項１に記載のズームレンズ。 In the gradient index lens, values for the d, g, and C lines corresponding to the coefficient N00λ are sequentially set to N00d, N00g, N00C,
The values for the d, g, and C lines corresponding to the coefficient N10λ are N10d, N10g, and N10C in order,
The Abbe numbers V00g and V10g of the gradient index lens material for these values are V00g = (N00d−1) / (N00g−N00C)
V10g = N10d / (N10g-N10C)
When the refractive index distribution type lens is a thin homogeneous lens having a refractive index of N00d as a material, the refractive power is φ2s, and the refractive power generated by the refractive index distribution medium is φ2m. −1.5 <(φ2s / V00g + φ2m / V10g) / (Φ2 / V00g) <1
The zoom lens according to claim 1, wherein the following condition is satisfied.
０．１ ＜ ｔ２／ｆｗ ＜ １
なる条件を満足することを特徴とする請求項１または２に記載のズームレンズ。 When the center thickness of the gradient index lens is t2, and the focal length at the wide angle end of the zoom lens is fw,
0.1 <t2 / fw <1
The zoom lens according to claim 1, wherein the following condition is satisfied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006243938A JP4956102B2 (en) | 2006-09-08 | 2006-09-08 | Zoom lens and imaging apparatus having the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006243938A JP4956102B2 (en) | 2006-09-08 | 2006-09-08 | Zoom lens and imaging apparatus having the same |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2008065124A JP2008065124A (en) | 2008-03-21 |
| JP2008065124A5 true JP2008065124A5 (en) | 2009-10-22 |
| JP4956102B2 JP4956102B2 (en) | 2012-06-20 |
Family
ID=39287884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2006243938A Expired - Fee Related JP4956102B2 (en) | 2006-09-08 | 2006-09-08 | Zoom lens and imaging apparatus having the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4956102B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130013514A (en) | 2011-07-28 | 2013-02-06 | 삼성전자주식회사 | Zoom lens and photographing device having the same |
| JP5787676B2 (en) * | 2011-09-02 | 2015-09-30 | キヤノン株式会社 | Zoom lens and optical equipment |
| JP2013061548A (en) * | 2011-09-14 | 2013-04-04 | Canon Inc | Imaging optical system and optical instrument having refraction index distribution type lens |
| KR101725982B1 (en) | 2014-11-17 | 2017-05-15 | 주식회사 엠지비엔도스코피 | Imaging Lens System for Endoscope |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61231517A (en) * | 1985-04-05 | 1986-10-15 | Canon Inc | Variable focal length lens |
| JPH0668573B2 (en) * | 1985-06-10 | 1994-08-31 | キヤノン株式会社 | Variable focal length lens |
| JPH0256515A (en) * | 1988-08-23 | 1990-02-26 | Olympus Optical Co Ltd | Variable power lens |
| JPH103037A (en) * | 1996-06-14 | 1998-01-06 | Minolta Co Ltd | Zoom lens |
| JPH10333034A (en) * | 1997-06-03 | 1998-12-18 | Olympus Optical Co Ltd | Optical system |
-
2006
- 2006-09-08 JP JP2006243938A patent/JP4956102B2/en not_active Expired - Fee Related
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