JP2009086566A5 - - Google Patents
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- JP2009086566A5 JP2009086566A5 JP2007259442A JP2007259442A JP2009086566A5 JP 2009086566 A5 JP2009086566 A5 JP 2009086566A5 JP 2007259442 A JP2007259442 A JP 2007259442A JP 2007259442 A JP2007259442 A JP 2007259442A JP 2009086566 A5 JP2009086566 A5 JP 2009086566A5
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- 230000003287 optical Effects 0.000 claims 111
- 238000003384 imaging method Methods 0.000 claims 82
- 238000005452 bending Methods 0.000 claims 3
- 239000002131 composite material Substances 0.000 claims 1
- 239000011521 glass Substances 0.000 claims 1
- 230000001681 protective Effects 0.000 claims 1
- 239000011347 resin Substances 0.000 claims 1
- 229920005989 resin Polymers 0.000 claims 1
Claims (37)
LL/AFL<3.4 ・・・(1)
ただし、AFLは前記撮像光学系の焦点距離、LLは前記撮像光学系の全長の空気換算距離である。 An imaging optical system having at least one positive lens and an imaging element, a planar element group having a positive refractive power is disposed closer to the object side than the imaging optical system, and the following conditional expression ( An imaging optical system characterized by satisfying 1).
LL / AFL <3.4 (1)
Here, AFL is the focal length of the imaging optical system, and LL is the air equivalent distance of the entire length of the imaging optical system.
R(λ)>20% ・・・(2)
ただし、R(λ)は波長λの時の反射率であり、
300nm≦λ≦1300nm
である。 The imaging optical system according to claim 2, wherein the reflectance of the reflecting surface that reflects the imaging light satisfies the following conditional expression (2).
R (λ)> 20% (2)
Where R (λ) is the reflectance at the wavelength λ,
300nm ≦ λ ≦ 1300nm
It is.
0.70<Φp/Φr<500 ・・・(3)
ただし、φrは前記反射部材の反射面での有効径、
φpは前記正の屈折力を有するプレーナー素子群のうち最も物体側に位置するプレーナー素子での有効径
である。 The imaging optical system according to claim 2 or 3, wherein the following conditional expression (3) is satisfied.
0.70 <Φp / Φr <500 (3)
However, φr is the effective diameter on the reflecting surface of the reflecting member,
φp is an effective diameter of the planar element located closest to the object side in the planar element group having the positive refractive power.
0.70<Φp/Φr<100 ・・・(4)
ただし、φrは前記反射部材の反射面での有効径、
φpは前記正の屈折力を有するプレーナー素子群のうち最も物体側に位置するプレーナー素子での有効径
である。 The imaging optical system according to claim 2 or 3, wherein the following conditional expression (4) is satisfied.
0.70 <Φp / Φr <100 (4)
However, φr is the effective diameter on the reflecting surface of the reflecting member,
φp is an effective diameter of the planar element located closest to the object side in the planar element group having the positive refractive power.
2<Φp/Φr<50 ・・・(5)
ただし、φrは前記反射部材の反射面での有効径、
φpは前記正の屈折力を有するプレーナー素子群のうち最も物体側に位置するプレーナー素子での有効径
である。 The imaging optical system according to claim 2 or 3, wherein the following conditional expression (5) is satisfied.
2 <Φp / Φr <50 (5)
Where φr is the effective diameter of the reflecting member on the reflecting surface
φp is an effective diameter of the planar element located closest to the object side in the planar element group having the positive refractive power.
αj <βk ・・・(6)
ただし、αj は前記フレネル光学素子の中心から周辺に向けて距離jにおける像側の面のエッジ角度、
βk は前記フレネル光学素子の中心から周辺に向けて距離kにおける物体側の面のエッジ角度
である。
ここで、j,kは何れも有効半径の50%以上の距離で、
0.85<k/j<1.1
を満足する。 The imaging optical system according to claim 7, wherein at least one of the Fresnel optical elements has a groove shape on both surfaces of the element and satisfies the following conditional expression (6).
α j <β k (6)
Where α j is the edge angle of the image side surface at a distance j from the center to the periphery of the Fresnel optical element,
β k is an edge angle of the object-side surface at a distance k from the center to the periphery of the Fresnel optical element.
Here, j and k are both 50% or more of the effective radius,
0.85 <k / j <1.1
Satisfied.
0≦Dp /FL<15 ・・・(7)
ただし、Dpは最も物体側に位置する前記プレーナー素子の物体面から物体までの空気換算距離、
FLは前記結像光学系内の前記第1レンズ群と前記第2レンズ群の合成焦点距離
である。 The imaging optical system according to claim 2, wherein the following conditional expression (7) is satisfied.
0 ≦ Dp / FL <15 (7)
Where Dp is the air equivalent distance from the object surface of the planar element located closest to the object side to the object,
FL is a combined focal length of the first lens group and the second lens group in the imaging optical system.
0≦Dp /FL<6 ・・・(8)
ただし、Dp は最も物体側に位置する前記プレーナー素子の物体面から物体までの空気換算距離、
FLは前記結像光学系内の前記第1レンズ群と前記第2レンズ群の合成焦点距離
である。 The imaging optical system according to any one of claims 2 to 8, wherein the following conditional expression (8) is satisfied.
0 ≦ Dp / FL <6 (8)
However, Dp Is the air equivalent distance from the object surface of the planar element located on the most object side to the object,
FL is a combined focal length of the first lens group and the second lens group in the imaging optical system.
0.1<|r3b/FL|<15 ・・・(9−1)
0<sag(3b)/Re(3b) ・・・(9−2)
ただし、r3bは最も像面側にあるレンズの像側の面の曲率半径、
FLは結像光学系内の前記第1レンズ群と前記第2レンズ群の合成焦点距離
である。
また、Re(3b)は最も像面側にあるレンズの像側の面の有効半径、
sag(3b)は光軸とレンズ像側面との交点を原点とし、さらに光軸をZ軸とした右手座標系を採ったとき、YZ断面においてレンズ像側面の有効径の地点とY軸との距離
である。 11. The second lens group according to claim 2, wherein the image side surface of the lens closest to the image plane is convex and satisfies the following conditional expression (9-1) or (9-2): The imaging optical system according to any one of the above.
0.1 <| r3b / FL | <15 (9-1)
0 <sag (3b) / Re (3b) (9-2)
Where r3b is the radius of curvature of the image side surface of the lens closest to the image plane side,
FL is a combined focal length of the first lens group and the second lens group in the imaging optical system.
Re (3b) is the effective radius of the image side surface of the lens closest to the image plane side,
When sag (3b) is a right-handed coordinate system in which the intersection of the optical axis and the lens image side surface is the origin, and the optical axis is the Z axis, the effective diameter point on the lens image side surface in the YZ section and the Y axis Distance.
0.5<|r3b/FL|<10 ・・・(10−1)
0<sag(3b)/Re(3b) ・・・(10−2)
ただし、r3bは最も像面側にあるレンズの像側の面の曲率半径、
FLは前記結像光学系内の前記第1レンズ群と前記第2レンズ群の合成焦点距離
である。
また、Re(3b)は最も像面側にあるレンズの像側の面の有効半径、
sag(3b)は光軸とレンズ像側面との交点を原点とし、さらに光軸をZ軸とした右手座標系を採ったとき、yz断面においてレンズ像側面の有効径の地点とY軸との距離
である。 11. The second lens group according to claim 2, wherein the image side surface of the lens closest to the image plane is convex and satisfies the following conditional expression (10-1) or (10-2): The imaging optical system according to any one of the above.
0.5 <| r3b / FL | <10 (10-1)
0 <sag (3b) / Re (3b) (10-2)
Where r3b is the radius of curvature of the image side surface of the lens closest to the image plane side,
FL is the composite focal length of the second lens group and the third lens group in the imaging optical system.
Re (3b) is the effective radius of the image side surface of the lens closest to the image plane side,
When sag (3b) is a right-handed coordinate system in which the intersection of the optical axis and the lens image side surface is the origin, and the optical axis is the Z axis, the effective diameter point on the lens image side surface in the yz section and the Y axis Distance.
0.2<bf/FL<10 ・・・(11)
ただし、bfは前記結像光学系内の前記第2レンズ群に含まれる最も像面側のレンズ面から結像面までの空気換算距離、
FLは前記結像光学系内の前記第1レンズ群と前記第2レンズ群の合成焦点距離
である。 The imaging optical system according to any one of claims 2 to 12, wherein the following conditional expression (11) is satisfied.
0.2 <bf / FL <10 (11)
However, bf is the air equivalent distance from the lens surface closest to the image plane to the imaging plane included in the second lens group in the imaging optical system,
FL is a combined focal length of the first lens group and the second lens group in the imaging optical system.
0.6<bf/FL<4.8 ・・・(12)
ただし、bfは前記結像光学系内の前記第2レンズ群に含まれる最も像面側のレンズ面から結像面までの空気換算距離、
FLは前記結像光学系内の前記第1レンズ群と前記第2レンズ群の合成焦点距離
である。 The imaging optical system according to claim 2, wherein the following conditional expression (12) is satisfied.
0.6 <bf / FL <4.8 (12)
However, bf is the air equivalent distance from the lens surface closest to the image plane to the imaging plane included in the second lens group in the imaging optical system,
FL is a combined focal length of the first lens group and the second lens group in the imaging optical system.
0.1<L1/LL<0.9 ・・・(13)
ただし、L1は撮像光学系内において、前記正の屈折力を有するプレーナー素子群のうち最も物体側に位置するプレーナー素子の物体面側から、少なくとも1つの反射部材のうち最も物体側に位置する前記反射部材の反射面までの空気換算距離、
LLは前記撮像光学系の全長の空気換算距離
である。 The imaging optical system according to claim 2, wherein the following conditional expression (13) is satisfied.
0.1 <L1 / LL <0.9 (13)
However, in the imaging optical system, L1 is located on the most object side of at least one reflecting member from the object surface side of the planar element located on the most object side in the planar element group having the positive refractive power. Air equivalent distance to the reflecting surface of the reflecting member,
LL is an air equivalent distance of the entire length of the imaging optical system.
0.3<L1/LL<0.8 ・・・(14)
ただし、L1は撮像光学系内において、前記正の屈折力を有するプレーナー素子群のうち最も物体側に位置するプレーナー素子の物体面側から、少なくとも1つの反射部材のうち最も物体側に位置する前記反射部材の反射面までの空気換算距離、
LLは前記撮像光学系の全長の空気換算距離
である。 The imaging optical system according to any one of claims 2 to 14, wherein the following conditional expression (14) is satisfied.
0.3 <L1 / LL <0.8 (14)
However, in the imaging optical system, L1 is located on the most object side of at least one reflecting member from the object surface side of the planar element located on the most object side in the planar element group having the positive refractive power. Air equivalent distance to the reflecting surface of the reflecting member,
LL is an air equivalent distance of the entire length of the imaging optical system.
0°<α≦180° ・・・(15)
ただし、αは前記撮像光学系入射前の光軸上の光線と屈曲後の光軸上の光線とのなす角度
であり、屈曲前後において前記反射部材の入射前の光軸上の光線と屈曲後の光軸上の光線がねじれの位置にあってもよい。 The imaging optical system according to any one of claims 2 to 16, wherein the following conditional expression (15) is satisfied by at least one reflecting member that bends the optical axis of the imaging light.
0 ° <α ≦ 180 ° (15)
However, α is an angle formed between the light beam on the optical axis before incidence on the imaging optical system and the light beam on the optical axis after bending, and before and after bending, the light beam on the optical axis before incidence of the reflecting member and after bending. The light beam on the optical axis may be in a twisted position.
fp/FL<−3 ・・・(16)
ただし、fpは前記光学的パワーを有するプリズムの焦点距離、
FLは前記結像光学系内の前記第1レンズ群と前記第2レンズ群の合成焦点距離
である。 19. The imaging optical system according to claim 18, wherein when the reflecting member is a prism, the prism has an optical power that satisfies the following conditional expression (16).
fp / FL <-3 (16)
Where fp is the focal length of the prism having the optical power,
FL is a combined focal length of the first lens group and the second lens group in the imaging optical system.
fp/FL<−5.5 ・・・(17)
ただし、fpは前記光学的パワーを有するプリズムの焦点距離、
FLは前記結像光学系内の前記第1レンズ群と前記第2レンズ群の合成焦点距離
である。 19. The imaging optical system according to claim 18, wherein when the reflecting member is a prism, the prism has an optical power that satisfies the following conditional expression (17).
fp / FL <−5.5 (17)
Where fp is the focal length of the prism having the optical power,
FL is a combined focal length of the first lens group and the second lens group in the imaging optical system.
前記第1レンズ群内の少なくとも1枚に非球面レンズを用い、さらに該レンズの物体側の面形状が以下の条件式(18)を満たすことを特徴とする請求項2乃至請求項25のいずれかに記載の撮像光学系。
0<sag(1a)/Re(1a) ・・・(18)
ただし、Re(1a)は、前記結像光学系内の前記第1レンズ群において最も前記プレーナー素子群に近いレンズの物体側の面の有効半径、
sag(1a)は、光軸とレンズ物体側面との交点を原点とし、さらに光軸をZ軸とした右手座標系を採ったとき、yz断面においてレンズ物体側面の有効径の地点とy軸との距離
である。 An imaging optical system in which at least one aspheric lens is used for the second lens group of the imaging optical system, and at least one surface of the aspheric lens has a shape that weakens the positive refractive power from the center to the periphery of the optical axis. In
The aspherical lens is used for at least one lens in the first lens group, and the object-side surface shape of the lens satisfies the following conditional expression (18): An imaging optical system according to claim 1.
0 <sag (1a) / Re (1a) (18)
Where Re (1a) is the effective radius of the object side surface of the lens closest to the planar element group in the first lens group in the imaging optical system,
sag (1a) is a point of the effective diameter of the lens object side surface in the yz section and the y axis when taking a right-handed coordinate system with the intersection point of the optical axis and the lens object side surface as the origin and the optical axis as the Z axis. Is the distance.
n>1.45 ・・・(19) The imaging optical system according to any one of claims 2 to 30, wherein refractive indexes of the planar element, the lens, and the reflecting member satisfy the following conditional expression (19).
n> 1.45 (19)
0°<α≦180° ・・・(15)0 ° <α ≦ 180 ° (15)
ただし、αは前記撮像光学系入射前の光軸上の光線と前記撮像光学系入射後の光軸上の光線とのなす角度であり、前記撮像光学系入射前後において入射前の光軸上の光線と入射後の光軸上の光線がねじれの位置にあってもよい。However, α is an angle formed by a light beam on the optical axis before entering the imaging optical system and a light beam on the optical axis after entering the imaging optical system. The light beam and the light beam on the optical axis after incidence may be in a twisted position.
前記フレネル光学素子のうち少なくとも1枚は、素子の両面に溝形状を有し、以下の条件式(6)を満足することを特徴とする請求項32に記載の撮像光学系。The imaging optical system according to claim 32, wherein at least one of the Fresnel optical elements has a groove shape on both sides of the element, and satisfies the following conditional expression (6).
αα j j <β<Β kk ・・・(6) ... (6)
ただし、αWhere α j j は前記フレネル光学素子の中心から周辺に向けて距離jにおける像側の面のエッジ角度、Is the edge angle of the image side surface at a distance j from the center to the periphery of the Fresnel optical element,
ββ k k は前記フレネル光学素子の中心から周辺に向けて距離kにおける物体側の面のエッジ角度Is the edge angle of the object-side surface at a distance k from the center to the periphery of the Fresnel optical element
である。It is.
ここで、j,kは何れも有効半径の50%以上の距離で、Here, j and k are both 50% or more of the effective radius,
0.85<k/j<1.10.85 <k / j <1.1
を満足する。Satisfied.
以下の条件式(8)を満足することを特徴とする請求項32又は請求項33に記載の撮像光学系。The imaging optical system according to claim 32 or 33, wherein the following conditional expression (8) is satisfied.
0≦Dp0 ≦ Dp /FL<6 ・・・(8)/ FL <6 (8)
ただし、DpHowever, Dp は最も物体側に位置する前記プレーナー素子の物体面から物体までの空気換算距離、Is the air equivalent distance from the object surface of the planar element located on the most object side to the object,
FLは前記結像光学系内の前記第1レンズ群と前記第2レンズ群の合成焦点距離FL is a combined focal length of the first lens group and the second lens group in the imaging optical system.
である。It is.
前記第2レンズ群は、最も像面側にあるレンズの像側面が凸形状で下記条件式(10−1)または(10−2)を満たすことを特徴とする請求項32乃至請求項34のいずれかに記載の撮像光学系。35. The second lens group according to claim 32, wherein the image side surface of the lens closest to the image plane is convex and satisfies the following conditional expression (10-1) or (10-2): The imaging optical system according to any one of the above.
0.5<|r3b/FL|<10 ・・・(10−1)0.5 <| r3b / FL | <10 (10-1)
0<sag(3b)/Re(3b) ・・・(10−2)0 <sag (3b) / Re (3b) (10-2)
ただし、r3bは最も像面側にあるレンズの像側の面の曲率半径、Where r3b is the radius of curvature of the image side surface of the lens closest to the image plane side,
FLは前記結像光学系内の前記第1レンズ群と前記第2レンズ群の合成焦点距離FL is a combined focal length of the first lens group and the second lens group in the imaging optical system.
である。It is.
また、Re(3b)は最も像面側にあるレンズの像側の面の有効半径、Re (3b) is the effective radius of the image side surface of the lens closest to the image plane side,
sag(3b)は光軸とレンズ像側面との交点を原点とし、さらに光軸をZ軸とした右手座標系を採ったとき、yz断面においてレンズ像側面の有効径の地点とY軸との距離When sag (3b) is a right-handed coordinate system in which the intersection of the optical axis and the lens image side surface is the origin, and the optical axis is the Z axis, the effective diameter point of the lens image side surface and the Y axis in the yz section distance
である。It is.
以下の条件式(12)を満足することを特徴とする請求項32乃至請求項35のいずれかに記載の撮像光学系。36. The imaging optical system according to claim 32, wherein the following conditional expression (12) is satisfied.
0.6<bf/FL<4.8 ・・・(12)0.6 <bf / FL <4.8 (12)
ただし、bfは前記結像光学系内の前記第2レンズ群に含まれる最も像面側のレンズ面から結像面までの空気換算距離、However, bf is the air equivalent distance from the lens surface closest to the image plane to the imaging plane included in the second lens group in the imaging optical system,
FLは前記結像光学系内の前記第1レンズ群と前記第2レンズ群の合成焦点距離FL is a combined focal length of the first lens group and the second lens group in the imaging optical system.
である。It is.
前記結像光学系の前記第2レンズ群に少なくとも1枚の非球面レンズを用い、前記非球面レンズの少なくとも1つの面が光軸中心から周辺にかけて正の屈折力を弱める形状を有する撮像光学系において、An imaging optical system in which at least one aspherical lens is used for the second lens group of the imaging optical system, and at least one surface of the aspherical lens has a shape that weakens the positive refractive power from the center to the periphery of the optical axis. In
前記第1レンズ群内の少なくとも1枚に非球面レンズを用い、さらに該レンズの物体側の面形状が以下の条件式(18)を満たすことを特徴とする請求項32乃至請求項36のいずれかに記載の撮像光学系。37. Any one of claims 32 to 36, wherein an aspheric lens is used for at least one lens in the first lens group, and the object-side surface shape of the lens satisfies the following conditional expression (18). An imaging optical system according to claim 1.
0<sag(1a)/Re(1a) ・・・(18)0 <sag (1a) / Re (1a) (18)
ただし、Re(1a)は、前記結像光学系内の前記第1レンズ群において最も前記プレーナー素子群に近いレンズの物体側の面の有効半径、Where Re (1a) is the effective radius of the object side surface of the lens closest to the planar element group in the first lens group in the imaging optical system,
sag(1a)は、光軸とレンズ物体側面との交点を原点とし、さらに光軸をZ軸とした右手座標系を採ったとき、yz断面においてレンズ物体側面の有効径の地点とy軸との距離sag (1a) is a point of the effective diameter of the lens object side surface in the yz section and the y axis when taking a right-handed coordinate system with the intersection point of the optical axis and the lens object side surface as the origin and the optical axis as the Z axis. Distance of
である。It is.
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TWI467224B (en) | 2012-11-21 | 2015-01-01 | Largan Precision Co Ltd | Optical image capturing lens system |
TWI548894B (en) | 2015-02-04 | 2016-09-11 | 大立光電股份有限公司 | Optical lens assembly and image capturing device |
TWI619984B (en) | 2017-08-15 | 2018-04-01 | 大立光電股份有限公司 | Image system lens assembly, imaging apparatus and electronic device |
CN110174751B (en) * | 2019-06-06 | 2021-06-18 | 歌尔光学科技有限公司 | Projection lens and projection display device |
CN112748518B (en) * | 2019-10-31 | 2022-08-23 | 亚洲光学股份有限公司 | Imaging lens |
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JPH06331887A (en) * | 1993-03-25 | 1994-12-02 | Asahi Optical Co Ltd | Compound lens |
JPH06324262A (en) * | 1993-05-11 | 1994-11-25 | Olympus Optical Co Ltd | Image pickup optical system |
JPH1152233A (en) * | 1997-07-31 | 1999-02-26 | Canon Inc | Attachment lens and optical system loaded therewith |
JP3342400B2 (en) * | 1998-04-14 | 2002-11-05 | キヤノン株式会社 | Optical system having diffractive optical element |
JP2002122784A (en) * | 2000-08-08 | 2002-04-26 | Olympus Optical Co Ltd | Optical device |
JP2003307673A (en) * | 2002-04-18 | 2003-10-31 | Fuji Photo Optical Co Ltd | Photographic optical system |
JP2004252360A (en) * | 2003-02-21 | 2004-09-09 | Canon Inc | Reflection type projection optical system and aligner having the same |
JP4800713B2 (en) * | 2005-09-05 | 2011-10-26 | オリンパスイメージング株式会社 | Imaging optical system, imaging device using the same, and authentication device |
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2007
- 2007-10-03 JP JP2007259442A patent/JP2009086566A/en active Pending
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