CN101021609B - Zoom lens and camera with zoom lens - Google Patents

Zoom lens and camera with zoom lens Download PDF

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Publication number
CN101021609B
CN101021609B CN2007100057940A CN200710005794A CN101021609B CN 101021609 B CN101021609 B CN 101021609B CN 2007100057940 A CN2007100057940 A CN 2007100057940A CN 200710005794 A CN200710005794 A CN 200710005794A CN 101021609 B CN101021609 B CN 101021609B
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Prior art keywords
lens
lens combination
combination
following conditional
face
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CN2007100057940A
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CN101021609A (en
Inventor
川上悦郎
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Casio Computer Co Ltd
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Casio Computer Co Ltd
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Priority claimed from JP2006039081A external-priority patent/JP4552870B2/en
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Abstract

The invention discloses a zoom lens and a camera using the zoom lens. On the object side of the zoom lens, a first lens assembly has negative refracting power as a whole; a second lens assembly has positive refracting power as a whole; a third lens assembly has negative refracting power as a whole. Zoom is realized by moving the first lens assembly and the second lens assembly in the direction of optical axis, or by moving the third lens assembly besides moving the first lens assembly and the second lens assembly. The entire large-aperture zoom lens with the zoom ratio of 3 consists of three lens assemblies, and the refracting powers of the lens assemblies on the object side are negative, positive and negative in turn. In this way, the full length of an optical system is reduced.

Description

Zoom lens and the video camera of having zoom lens
Technical field
The present invention relates generally to the zoom lens of employed high performance bright (the F number is less) in the small-sized image pickup device, and said small-sized image pickup device is used for being equipped on the CCD imageing sensors such as (charged coupled device) of digital still camera etc.
Background technology
In small-sized digital still camera; For the camera body attenuate is adopted the single focal lense that can reduce the size of optical axis direction as far as possible; In addition; Also make great efforts to produce the creation that spy for example drives the lens of the distinctive dispositions far away of imageing sensor (tele-centric) such as the disclosed the sort of CCD of 2002-228922 communique (patent documentation 1), wait and make it commercialization.Yet, stronger to the hope of the lift-launch of the zoom lens of video camera etc.Current, even in digital still camera, the main flow of goods also becomes the video camera that zoom lens carry.
(patent documentation 1) spy opens the 2002-228922 communique
The video camera of a kind of small-sized zoom lens or small-sized subsidiary zoom can be provided in the present invention.
Summary of the invention
One of them of preferred forms of the present invention is a kind of zoom lens, it is characterized in that,
From object side; The 2nd lens combination and whole the 3rd lens combination with negative refracting power that the 1st lens combination, the integral body that has a negative refracting power by integral body in order has positive refracting power constitute; About becoming doubly; Through the position of said the 1st lens combination and said the 2nd lens combination is moved along optical axis direction; Perhaps accomplish,, satisfy following conditional (1) about the optical power that said the 1st lens combination is had through except moving said the 1st lens combination and said the 2nd lens combination, also moving said the 3rd lens combination; Size about the lens total system satisfies following conditional (2), and the optical power that is had about said the 3rd lens combination satisfies following conditional (3):
(1)-0.8≤f w/f I≤-0.45
(2)4.5≤TL w/f w≤7.5
(3)-0.55≤f w/f III≤0
In the formula:
f w: the system-wide synthetic focal length of the lens in the wide-angle side; f I: the synthetic focal length of the 1st lens combination;
f III: the synthetic focal length of the 3rd lens combination; TL w: the face of the object side of the 1st lens of the 1st lens combination from constitute wide-angle side is to the distance of image planes, and wherein the parallel plane glass part is the air scaled distance.
One of them of preferred forms of the present invention, as preferred said the 1st lens combination, through constituting by following lens in order from object side: i.e. the 1st lens, it is the lens with negative refracting power; The 2nd lens, it is the lens with positive refracting power; The 3rd lens, it has negative refracting power, the optical power that is had about said the 2nd lens; Satisfy following conditional (4); About the dispersing characteristic in each lens that is allocated in said the 1st lens combination, satisfy following conditional (5), satisfy following conditional (6) about the refractive index of said the 2nd lens:
(4)0.22≤f w/f 2≤0.55
(5)15≤(υ 1+υ 3)/2-υ 2
(6)1.65≤n 2
Wherein: f 2: the focal length that constitutes the 2nd lens of the 1st lens combination; υ 1: the Abbe number that constitutes the 1st lens of the 1st lens combination; υ 2: the Abbe number that constitutes the 2nd lens of the 1st lens combination; υ 3: the Abbe number that constitutes the 3rd lens of the 1st lens combination; n 2: the 2nd lens of 1 lens combination of formation are to the refractive index of d line.
One of them of preferred forms of the present invention; Said the 1st lens as said the 1st lens combination of preferred formation are non-spherical lenses; The shape as the face of side about said the 1st lens satisfies following conditional (7), satisfies following conditional (8) with the relative characteristic of the shape of the face of the object side of the 2nd lens that constitute said the 1st lens combination:
(7)0.4≤f w/r 2≤1.4
(8)0≤r 2/r 3≤1.5
Wherein: r 2: the radius-of-curvature of face of picture side that constitutes the 1st lens of the 1st lens combination; r 3: the radius-of-curvature of face of object side that constitutes the 2nd lens of the 1st lens combination.
One of them of preferred forms of the present invention; As preferred said the 2nd lens combination; Through disposing as the 4th lens, as the 5th lens from object side in order, constituting as the 6th lens of lens and as the 7th lens with lens of positive refracting power with negative refracting power with lens of positive refracting power with lens of positive refracting power; The positive synthesizing optical ability that is had about said the 4th lens and said the 5th lens satisfies following conditional (9); The negative optical power that is had about the 6th lens; Satisfy following conditional (10); Dispersing characteristic about being allocated in said the 4th lens that dispose in order from object side in said the 2nd lens combination, said the 5th lens and said the 6th lens satisfies following conditional (11), in the relation of the refractive index that these each lens had, satisfies following conditional (12):
(9)0.5≤f w/f 4、5≤1.5
(10)-1.5≤f w/f 6≤-0.25
(11)28≤(υ 4+υ 5)/2-υ 6
(12)(n 4+n 5)/2-n 6≤-0.24
Wherein, f 4,5: constitute the 4th lens of the 2nd lens combination and the synthetic focal length of the 5th lens; f 6: constitute the focal length of the 6th lens of the 2nd lens combination, constituting at the 6th lens under the situation of compound non-spherical lens is the synthetic focal length of parent spherical lens and resin part; υ 4: the Abbe number that constitutes the 4th lens of the 2nd lens combination; υ 5: the Abbe number that constitutes the 5th lens of the 2nd lens combination; υ 6: constitute the Abbe number of the 6th lens of the 2nd lens combination, constituting at the 6th lens under the situation of compound non-spherical lens is that the glass material of parent spherical lens is the Abbe number of nitre material; n 4: constitute the refractive index of the 4th lens of the 2nd lens combination to the d line; n 5: constitute the refractive index of the 5th lens of the 2nd lens combination to the d line; n 6: constitute the refractive index of the 6th lens of the 2nd lens combination to the d line.
One of them of preferred forms of the present invention; In the plane of refraction as each lens of said the 2nd lens combination of preferred formation; Having a face at least is aspherical shape; Shape about the face of the object side of the 4th lens that constitute said the 2nd lens combination satisfies following conditional (13), satisfies following conditional (14) about the shape as the face of side of the 6th lens that constitute said the 2nd lens combination:
(13)0.2≤f w/r 7≤1.0
(14)0.4≤f w/r 12≤1.6
Wherein: r 7: the radius-of-curvature of face of object side that constitutes the 4th lens of the 2nd lens combination; r 12: constituting the radius-of-curvature of face of picture side of the 6th lens of the 2nd lens combination, is under the situation of resin lens face of compound lens at the face as side of the 6th lens, is the radius-of-curvature of the boundary surface between resin and the air.
One of them of preferred forms of the present invention, as preferred said the 3rd lens combination by constituting as the 8th lens with negative refractive power lens, the shape about the face of the object side of said the 8th lens, satisfy following conditional (15):
(15)-2.0≤f w/r 15≤0.2
Wherein: r 15: the radius-of-curvature of face of object side that constitutes the 8th lens of the 3rd lens combination.
Another of preferred forms of the present invention is a kind of zoom lens; It is characterized in that; The 2nd lens combination and whole the 3rd lens combination with negative refracting power that the 1st lens combination, the integral body that has a negative refracting power by integral body in order from object side has positive refracting power constitute, and said the 1st lens combination integral body has negative refracting power, and constitutes through disposing following lens: the 1st lens; It is the lens with negative refracting power, and is to the protruding meniscus shape of object side; The 2nd lens, it is the lens with positive refracting power, and is to the protruding meniscus shape of object side; And the 3rd lens; It is the lens with negative refracting power; Said the 2nd lens combination integral body has positive refracting power; And through configuration as the 4th lens with lens of positive refracting power, be to have the lens of negative refracting power and be to constitute that said the 3rd lens combination integral body has negative refracting power, and constitutes as the 7th lens with lens of negative refracting power through configuration to the 5th lens of the protruding meniscus shape of object side and as the 6th lens with lens of positive refracting power; About becoming doubly; Through move the position of said the 1st lens combination and said the 2nd lens combination along optical axis direction, perhaps to accomplish through the position of except moving said the 1st lens combination and said the 2nd lens combination, also moving said the 3rd lens, the optical power that is had about said the 1st lens combination satisfies following conditional (16); Size about the lens total system satisfies following conditional (17), and the optical power that is had about said the 3rd lens combination satisfies following conditional (18):
(16)-0.8≤f w/f I≤-0.4
(17)4.5≤TL w/f w≤7.5
(18)-0.6≤f w/f III≤0
In the formula, f w: the system-wide synthetic focal length of the lens in the wide-angle side; f I: the synthetic focal length of the 1st lens combination; f III: the synthetic focal length of the 3rd lens combination; TL w: the distance of image planes is arrived in the object side that constitutes the 1st lens of the 1st lens combination in the wide-angle side, and wherein the parallel plane glass part is the air scaled distance.
Another of preferred forms of the present invention is non-spherical lens as said the 1st lens of said the 1st lens combination of preferred formation, the optical power that is had about said the 2nd lens; Satisfy following relational expression (19); About the dispersing characteristic in each lens that is allocated in the 1st lens combination, satisfy following conditional (20), satisfy following conditional (21) about the refractive index of said the 2nd lens; Shape about the face of the picture side of said the 1st lens; Satisfy following conditional (22), the relative characteristic about the shape of the face of the object side of the face of the picture side of said the 1st lens and said the 2nd lens, satisfy following conditional (23):
(19)0.25≤f w/f 2≤0.55
(20)15≤(υ 1+υ 3)/2-υ 2
(21)1.65≤n 2
(22)0.8≤f w/r 2≤1.5
(23)0.45≤r 2/r 3≤0.85
Wherein: f 2: the focal length that constitutes the 2nd lens of the 1st lens combination; υ 1: the Abbe number that constitutes the 1st lens of the 1st lens combination; υ 2: the Abbe number that constitutes the 2nd lens of the 1st lens combination; υ 3: the Abbe number that constitutes the 3rd lens of the 1st lens combination; n 2: constitute the refractive index of the 2nd lens of the 1st lens combination to the d line; r 2: the radius-of-curvature of face of picture side that constitutes the 1st lens of the 1st lens combination; r 3: the radius-of-curvature of face of object side that constitutes the 2nd lens of the 1st lens combination.
Another of preferred forms of the present invention; In the plane of refraction as each lens of said the 2nd lens combination of preferred formation; At least one plane of refraction is an aspherical shape; The positive optical power that is had about said the 4th lens satisfies following conditional (24), and the negative optical power that is had about said the 5th lens satisfies following conditional (25), satisfies following conditional (26) about the dispersing characteristic that is distributed in each lens that constitutes said the 2nd lens combination; In the relation of the refractive index that these each lens had, satisfy following conditional (27); Shape about the face of the object side of said the 4th lens satisfies following conditional (28), and the relativeness about the shape of the face of the picture side of the face of the object side of said the 4th lens and said the 6th lens satisfies following conditional (29):
(24)0.65≤f w/f 4≤1.05
(25)-0.5≤f w/f 5≤-0.3
(26)25≤(υ 4+υ 6)/2-υ 5
(27)-0.45≤(n 4+n 6)/2-n 5≤-0.20
(28)0.8≤f w/r 7≤1.3
(29)-1.1≤r 7/r 12≤-0.7
Wherein: f 4: the focal length that constitutes the 4th lens of the 2nd lens combination; f 5: the focal length that constitutes the 5th lens of the 2nd lens combination; υ 4: the Abbe number that constitutes the 4th lens of the 2nd lens combination; υ 5: the Abbe number that constitutes the 5th lens of the 2nd lens combination; υ 6: the Abbe number that constitutes the 6th lens of the 2nd lens combination; n 4: constitute the refractive index of the 4th lens of the 2nd lens combination to the d line; n 5: constitute the refractive index of the 5th lens of the 2nd lens combination to the d line; n 6: constitute the refractive index of the 6th lens of the 2nd lens combination to the d line; r 7: the radius-of-curvature of face of object side that constitutes the 4th lens of the 2nd lens combination; r 12: the radius-of-curvature of face of picture side that constitutes the 6th lens of the 2nd lens combination.
Another of preferred forms of the present invention, about the shape of the face of the object side of said the 7th lens that constitute said the 3rd lens combination, satisfy following conditional (30) as preferably:
(30)-1.2≤f w/r 13≤0.4
Wherein: r 13: the radius-of-curvature of face of object side that constitutes the 7th lens of the 3rd lens combination.
The present invention also provides a kind of video camera, is equipped with the zoom lens of the preferred forms of the invention described above its year.
Description of drawings
Fig. 1 is based on the lens pie graph of the 1st embodiment of zoom lens of the present invention.
Fig. 2 is all aberration diagrams of the lens of the 1st embodiment.
Fig. 3 is based on the lens pie graph of the 2nd embodiment of zoom lens of the present invention.
Fig. 4 is all aberration diagrams of the lens of the 2nd embodiment.
Fig. 5 is based on the lens pie graph of the 3rd embodiment of zoom lens of the present invention.
Fig. 6 is all aberration diagrams of the lens of the 3rd embodiment.
Fig. 7 is based on the lens pie graph of the 4th embodiment of zoom lens of the present invention.
Fig. 8 is all aberration diagrams of the lens of the 4th embodiment.
Fig. 9 is based on the lens pie graph of the 5th embodiment of zoom lens of the present invention.
Figure 10 is all aberration diagrams of the lens of the 5th embodiment.
Figure 11 is based on the lens pie graph of the 6th embodiment of zoom lens of the present invention.
Figure 12 is all aberration diagrams of the lens of the 6th embodiment.
Figure 13 is based on the lens pie graph of the 7th embodiment of zoom lens of the present invention.
Figure 14 is all aberration diagrams of the lens of the 7th embodiment.
Figure 15 is based on the lens pie graph of the 8th embodiment of zoom lens of the present invention.
Figure 16 is all aberration diagrams of the lens of the 8th embodiment.
Figure 17 is based on the lens pie graph of the 9th embodiment of zoom lens of the present invention.
Figure 18 is all aberration diagrams of the lens of the 9th embodiment.
Figure 19 is based on the lens pie graph of the 10th embodiment of zoom lens of the present invention.
Figure 20 is all aberration diagrams of the lens of the 10th embodiment.
Figure 21 is based on the lens pie graph of the 11st embodiment of zoom lens of the present invention.
Figure 22 is all aberration diagrams of the lens of the 11st embodiment.
Figure 23 is based on the lens pie graph of the 12nd embodiment of zoom lens of the present invention.
Figure 24 is all aberration diagrams of the lens of the 12nd embodiment.
Figure 25 is based on the lens pie graph of the 13rd embodiment of zoom lens of the present invention.
Figure 26 is all aberration diagrams of the lens of the 13rd embodiment.
Figure 27 is based on the lens pie graph of the 14th embodiment of zoom lens of the present invention.
Figure 28 is all aberration diagrams of the lens of the 14th embodiment.
Figure 29 is based on the lens pie graph of the 15th embodiment of zoom lens of the present invention.
Figure 30 is all aberration diagrams of the lens of the 15th embodiment.
Figure 31 is based on the lens pie graph of the 16th embodiment of zoom lens of the present invention.
Figure 32 is all aberration diagrams of the lens of the 16th embodiment.
Figure 33 is based on the lens pie graph of the 17th embodiment of zoom lens of the present invention.
Figure 34 is all aberration diagrams of the lens of the 17th embodiment.
Figure 35 is based on the lens pie graph of the 18th embodiment of zoom lens of the present invention.
Figure 36 is all aberration diagrams of the lens of the 18th embodiment.
Figure 37 is based on the lens pie graph of the 19th embodiment of zoom lens of the present invention.
Figure 38 is all aberration diagrams of the lens of the 19th embodiment.
Figure 39 is based on the lens pie graph of the 20th embodiment of zoom lens of the present invention.
Figure 40 is all aberration diagrams of the lens of the 20th embodiment.
Figure 41 is based on the lens pie graph of the 21st embodiment of zoom lens of the present invention.
Figure 42 is all aberration diagrams of the lens of the 21st embodiment.
Figure 43 is based on the lens pie graph of the 22nd embodiment of zoom lens of the present invention.
Figure 44 is all aberration diagrams of the lens of the 22nd embodiment.
Figure 45 is based on the lens pie graph of the 23rd embodiment of zoom lens of the present invention.
Figure 46 is all aberration diagrams of the lens of the 23rd embodiment.
Figure 47 is based on the lens pie graph of the 24th embodiment of zoom lens of the present invention.
Figure 48 is all aberration diagrams of the lens of the 4th embodiment.
Embodiment
Below, the concrete numerical value embodiment about relevant with the present invention describes as embodiment 1～embodiment 16.In following embodiment 1 to embodiment 16, constitute by the 1st lens combination LG1, the 2nd lens combination LG2 and the 3rd lens combination LG3 in order from object side.Said the 1st lens combination LG1 integral body has negative refracting power; And constitute: promptly as the 1st lens L1 of the lens with negative refracting power (following be negative lens) (with the face of the object side of the 1st lens L1 as the 1st, with the image planes side as the 2nd face) through disposing following lens; As the 2nd lens L2 of the lens with positive refracting power (following for positive lens) (the object side of the 2nd lens L2 as the 3rd, will be looked like the side as the 4th face); And as the 3rd lens L3 of negative lens (the object side of the 3rd lens L3 as the 5th, will be looked like the side as the 6th face).Said the 2nd lens combination LG2 integral body has positive refracting power; And constitute through disposing following lens: promptly as the 4th lens L4 of positive lens (with the object side of the 4th lens L4 as the 7th; To look like the side as the 8th face); As the 5th lens L5 of positive lens (the object side of the 5th lens L5 as the 9th, will be looked like the side as the 10th face); As the 6th lens L6 of negative lens (though with the object side of the 6th lens L6 as the 11st; To look like the side as the 12nd; But under the situation that the 5th lens L5 and the 6th lens L6 gummed is constituted, only represent 11 face numbering with parantheses; Be under the situation of resin face of compound non-spherical lens at the 11st and the 12nd face in addition, with the boundary surface of resin and air as the HB face); And as the 7th lens of positive lens (the object side of the 7th lens L7 as the 13rd, will be looked like the side as the 14th face).Said the 3rd lens combination LG3 integral body has negative refracting power, and constitutes as the 8th lens L8 of negative lens (face of the object side of the 8th lens L8 as the 15th, will be looked like the side as the 16th face) through configuration.In addition; Between the 16th of the image planes side of said the 8th lens L8 and the image planes; Dispose across the airspace as quartzy light filter LPF (with the object side of quartzy light light filter LPF as the 17th; To look like the side as the 18th face) and as the sealing cover glass CG of the protection usefulness of the camera part of CCD (the object side of sealing cover glass CG as the 19th, will be looked like the side as the 20th face).Usually except adopting imageing sensor such as CCD, the ending of necessary infrared light, tackle through on the one side of the plane of refraction of said quartzy light light filter LPF, implementing infrared external reflection plated film (coating), in this diagram not.About becoming doubly, through the position of said the 1st lens combination LG1 and said the 2nd lens combination LG2 is moved along optical axis direction, perhaps except with also the position of the 3rd lens combination LG3 being moved and accomplished said the 1st lens combination LG1 and said the 2nd lens combination LG2.In addition, in each embodiment, about with the corresponding focal adjustments of the object of limited distance, can constitute through the position of said the 1st lens combination LG1 or said the 3rd lens combination LG3 is moved along optical axis direction, but be not limited to these methods.
In addition, for employed aspheric surface among each embodiment, as is generally known that kind, with optical axis direction as the Z axle, under the situation of direction that will be vertical as the Y axle with optical axis, will be by the aspheric surface formula
Z = ( Y 2 / R ) / [ 1 + { 1 - ( 1 + K ) ( Y / R ) 2 } ]
+ A · Y 4 + B · Y 6 + C · Y 8 + D · Y 10 + · · · ·
The curve of being given rotation and obtain curved surface around optical axis, and, through giving paraxial radius of curvature R, constant of the cone K, high order aspheric surface coefficient A, B, C, D and define shape.In addition, " E numeral back to back " expression " 10 tired taking advantage of " in the mark of the asphericity coefficient of the constant of the cone in the table and high order with it.For example, " E-04 " expression 10 -4, this numerical value is attached on the numerical value before it.
About the related zoom lens of present embodiment, wherein, from object side; The 2nd lens combination and whole the 3rd lens combination with negative refracting power that the 1st lens combination, the integral body that has a negative refracting power by integral body in order has positive refracting power constitute; About becoming doubly,, perhaps except moving said the 1st lens combination and said the 2nd lens combination, also move said the 3rd lens combination through the position of said the 1st lens combination and said the 2nd lens combination is moved along optical axis direction; Constitute therefrom; About the optical power that said the 1st lens combination is had, satisfy following conditional (1), satisfy following conditional (2) about the size of lens total system; In addition, the optical power that is had about said the 3rd lens combination satisfies following conditional (3):
(1)-0.8≤f w/f I≤-0.45
(2)4.5≤TL w/f w≤7.5
(3)-0.55≤f w/f III≤0
Wherein:
f w: the system-wide synthetic focal length of the lens in the wide-angle side;
f I: the synthetic focal length of the 1st lens combination;
f III: the synthetic focal length of the 3rd lens combination;
TL w: the object plane side of the 1st lens of the 1st lens combination from constitute wide-angle side is to the distance (wherein, the parallel plane glass part is the air scaled distance) of image planes.
In addition, in described zoom lens, said the 1st lens combination, through constituting from the following in order lens of object side: i.e. the 1st lens, it has the lens (below be called negative lens) of negative refracting power; The 2nd lens, it has positive refracting power (below be called positive lens); The 3rd lens, it is a negative lens, the optical power that is had about said the 2nd lens; Satisfy following conditional (4),, satisfy following conditional (5) about the dispersing characteristic in each lens that is allocated in said the 1st lens combination; In addition, the refractive index about said the 2nd lens satisfies following conditional (6):
(4)0.22≤f w/f 2≤0.55
(5)15≤(υ 1+υ 3)/2-υ 2
(6)1.65≤n 2
Wherein:
f 2: the focal length that constitutes the 2nd lens of the 1st lens combination;
υ 1: the Abbe number that constitutes the 1st lens of the 1st lens combination;
υ 2: the Abbe number that constitutes the 2nd lens of the 1st lens combination;
υ 3: the Abbe number that constitutes the 3rd lens of the 1st lens combination;
n 2: the 2nd lens of 1 lens combination of formation are to the refractive index of d line.
In addition; In described zoom lens; Said the 1st lens that constitute said the 1st lens combination are non-spherical lenses; Shape about the face of said picture side satisfies following conditional (7), in addition, satisfies following conditional (8) with the relative characteristic of the shape of the face of the object side of said the 2nd lens that constitute said the 1st lens combination:
(7)0.4≤f w/r 2≤1.4
(8)0≤r 2/r 3≤1.5
Wherein:
r 2: the radius-of-curvature of face of picture side that constitutes the 1st lens of the 1st lens combination;
r 3: the radius-of-curvature of face of object side that constitutes the 2nd lens of the 1st lens combination.
In addition; In above-mentioned zoom lens; Said the 2nd lens combination, through dispose the 4th lens in order as positive lens from object side, as the 5th lens of positive lens, constitute as the 6th lens of negative lens and as the 7th lens of positive lens, the positive synthesizing optical ability that is had about said the 4th lens and said the 5th lens satisfies following conditional (9); The negative optical power that is had about the 6th lens; Satisfy following conditional (10), satisfy following conditional (11) about the dispersing characteristic that is allocated in said the 4th lens that dispose in order from object side in said the 2nd lens combination, said the 5th lens and said the 6th lens, in addition; Same in the relation of the refractive index that these each lens had, satisfy following conditional (12):
(9)0.5≤f w/f 4、5≤1.5
(10)-1.5≤f w/f 6≤-0.25
(11)28≤(υ 4+υ 5)/2-υ 6
(12)(n 4+n 5)/2-n 6≤-0.24
Wherein,
f 4,5: constitute the 4th lens of the 2nd lens combination and the synthetic focal length of the 5th lens;
f 6: the focal length (wherein, being the synthetic focal length of parent spherical lens and resin part under the 6th lens constitute the situation of compound non-spherical lens) that constitutes the 6th lens of the 2nd lens combination;
υ 4: the Abbe number that constitutes the 4th lens of the 2nd lens combination;
υ 5: the Abbe number that constitutes the 5th lens of the 2nd lens combination;
υ 6: the Abbe number (wherein, constituting under the situation of compound non-spherical lens at the 6th lens is the synthetic focal length of the glass material (nitre material) of parent spherical lens) that constitutes the 6th lens of the 2nd lens combination.
n 4: constitute the refractive index of the 4th lens of the 2nd lens combination to the d line;
n 5: constitute the refractive index of the 5th lens of the 2nd lens combination to the d line;
n 6: constitute the refractive index of the 6th lens of the 2nd lens combination to the d line;
In addition; In above-mentioned zoom lens, constitute in the plane of refraction of each lens of said the 2nd lens combination, having a face at least is aspherical shape; Shape about the face of the object side of said the 4th lens; Satisfy following conditional (13), in addition, satisfy following conditional (14) about the shape as the face of side of said the 6th lens:
(13)0.2≤f w/r 7≤1.0
(14)0.4≤f w/r 12≤1.6
Wherein:
r 7: the radius-of-curvature of face of object side that constitutes the 4th lens of the 2nd lens combination;
r 12: the radius-of-curvature (wherein, being under the situation of resin lens face of compound lens at the face as side of the 6th lens, is the radius-of-curvature of the boundary surface between resin and the air) of face of picture side that constitutes the 6th lens of the 2nd lens combination.
In addition, in above-mentioned zoom lens, said the 3rd lens combination is made up of the 8th lens as negative lens, and the shape about the face of the object side of said the 8th lens satisfies following conditional (15):
(15)-2.0≤f w/r 15≤0.2
Wherein:
r 15: the radius-of-curvature of face of object side that constitutes the 8th lens of the 3rd lens combination.
(embodiment 1)
Table 1 shows numerical example with regard to the 1st embodiment of zoom lens of the present invention.Exception, Fig. 1 is its lens pie graph, Fig. 2 is its all aberration diagram.In table and the drawing, f representes the focal length (following expression from the left side to the wide-angle side, the value of intermediate field, telescope end) of lens total system, F NoExpression F number (number), 2 ω represent the whole visual angle of lens.In addition, R representes radius-of-curvature, and D representes lens thickness or lens at interval, and υ d representes the Abbe number of d line.D, g, C in the spherical aberration diagram in all aberration diagrams represent the aberration curve in the wavelength separately respectively.In addition, S.C. representes sine condition.S among the astigmatism figure representes the sagitta of arc (sagital) direction, and M representes warp direction (meridional: メ リ デ イ オ Na Le).
[table 1]
Figure 200710005794010000200091
(embodiment 2)
Table 2 shows numerical example with regard to the 2nd embodiment of zoom lens of the present invention.Fig. 3 representes its lens pie graph in addition, and Fig. 4 is its all aberration diagram.
[table 2]
Figure 200710005794010000200101
(embodiment 3)
Table 3 shows numerical example with regard to the 3rd embodiment of zoom lens of the present invention.Fig. 5 representes its lens pie graph in addition, and Fig. 6 is its all aberration diagram.
[table 3]
(embodiment 4)
Table 4 shows numerical example with regard to the 4th embodiment of zoom lens of the present invention.Fig. 7 representes its lens pie graph in addition, and Fig. 8 is its all aberration diagram.
[table 4]
Figure 200710005794010000200121
(embodiment 5)
Table 5 shows numerical example with regard to the 5th embodiment of zoom lens of the present invention.Fig. 9 representes its lens pie graph in addition, and Figure 10 is its all aberration diagram.
[table 5]
Figure 200710005794010000200131
(embodiment 6)
Table 6 shows numerical example with regard to the 6th embodiment of zoom lens of the present invention.Figure 11 representes its lens pie graph in addition, and Figure 12 is its all aberration diagram.
[table 6]
Figure 200710005794010000200141
(embodiment 7)
Table 7 shows numerical example with regard to the 7th embodiment of zoom lens of the present invention.Figure 13 representes its lens pie graph in addition, and Figure 14 is its all aberration diagram.
[table 7]
Figure 200710005794010000200151
(embodiment 8)
Table 8 shows numerical example with regard to the 8th embodiment of zoom lens of the present invention.Figure 15 representes its lens pie graph in addition, and Figure 16 is its all aberration diagram.
[table 8]
Figure 200710005794010000200161
(embodiment 9)
Table 9 shows numerical example with regard to the 9th embodiment of zoom lens of the present invention.Figure 17 representes its lens pie graph in addition, and Figure 18 is its all aberration diagram.
[table 9]
(embodiment 10)
Table 10 shows numerical example with regard to the 10th embodiment of zoom lens of the present invention.Figure 19 representes its lens pie graph in addition, and Figure 20 is its all aberration diagram.
[table 10]
(embodiment 11)
Table 11 shows numerical example with regard to the 11st embodiment of zoom lens of the present invention.Figure 21 representes its lens pie graph in addition, and Figure 22 is its all aberration diagram.
[table 11]
Figure 200710005794010000200191
(embodiment 12)
Table 12 shows numerical example with regard to the 12nd embodiment of zoom lens of the present invention.Figure 23 representes its lens pie graph in addition, and Figure 24 is its all aberration diagram.
[table 12]
(embodiment 13)
Table 13 shows numerical example with regard to the 13rd embodiment of zoom lens of the present invention.Figure 25 representes its lens pie graph in addition, and Figure 26 is its all aberration diagram.
[table 13]
Figure 200710005794010000200211
(embodiment 14)
Table 14 shows numerical example with regard to the 14th embodiment of zoom lens of the present invention.Figure 27 representes its lens pie graph in addition, and Figure 28 is its all aberration diagram.
[table 14]
Figure 200710005794010000200221
(embodiment 15)
Table 15 shows numerical example with regard to the 15th embodiment of zoom lens of the present invention.Figure 29 representes its lens pie graph in addition, and Figure 30 is its all aberration diagram.
[table 15]
Figure 200710005794010000200231
(embodiment 16)
Table 16 shows numerical example with regard to the 16th embodiment of zoom lens of the present invention.Figure 31 representes its lens pie graph in addition, and Figure 32 is its all aberration diagram.
[table 16]
Figure 200710005794010000200241
Next, in table 17, with embodiment 1 to embodiment 16 relatively, to represent from conditional (1) to corresponding gathering of value of conditional (15).
Table 17
Figure 200710005794010000200251
Figure 200710005794010000200261
As table 17 is understood, satisfy condition formula (1) to (15) with the relevant numerical value of each embodiment, and as from the aberration diagram each embodiment is understood, each aberration has all obtained good correction from embodiment 1 to embodiment 16.
Next, just relevant with the present invention concrete numerical value embodiment explains as embodiment 17 to embodiment 24.From following embodiment 17 to embodiment 24; From object side in order; Be made up of the 1st lens combination LG1, the 2nd lens combination LG2 and lens combination LG3, said the 1st lens combination LG1 integral body has negative refracting power, and constitutes through disposing following lens: i.e. the 1st lens L1; It is lens with negative refracting power (below be called negative lens) and is to the protruding meniscus shape of object side (following object side with the 1st lens L1 will look like the side as the 2nd face as the 1st); The 2nd lens L2, it is lens with positive refracting power (below be called positive lens), and has protruding meniscus shape (the object side of the 2nd lens L2 as the 3rd, will be looked like the side as the 4th face) at object side; And the 3rd lens L3, it is negative lens (the object side of the 3rd lens L3 as the 5th, will be looked like the side as the 6th face).Said the 2nd lens combination LG2, integral body has positive refracting power, and constitutes through disposing following lens: i.e. the 4th lens L4, it is positive lens (the object side of the 4th lens L4 as the 7th, will be looked like the side as the 8th face); The 5th lens L5, it is for negative lens and be the meniscus shape (the object side of the 5th lens L5 as the 9th, will be looked like the side as the 10th face) to object side protrusion; And the 6th lens L6, it is positive lens (the object side of the 6th lens L6 as the 11st, will be looked like the side as the 12nd face).Said the 3rd lens combination LG3, integral body has negative refracting power, and constitutes as the 7th lens L7 of negative lens (the object side of the 7th lens L7 as the 13rd, will be looked like the side as the 14th face) through configuration.In addition; Between the 14th of the side of picture and image planes of said the 7th lens L7; Dispose across the airspace: quartzy light light filter LPF is (with the object side of quartzy light light filter LPF as the 15th; To look like the side as the 16th face) and as the sealing cover glass CG of the protection usefulness of the camera part of CCD (the object side of sealing cover glass CG as the 17th, will be looked like the side as the 18th face).Usually using needed ultrared the ending of imageing sensor of CCD and so on, is to tackle through on a face of the plane of refraction of said quartzy optical filter LPF, implementing infrared ray plated film etc., to this diagram not.About becoming doubly, then be through the position of said the 1st lens combination LG1, the 2nd lens combination LG2 is moved along optical axis direction, perhaps except moving said the 1st lens combination LG1 and said the 2nd lens combination LG2, also move the position of fast the 3rd lens combination LG3, and accomplish.In addition, in embodiment, can accomplish through the position of said the 1st lens combination LG1 or said the 3rd lens combination LG3 is moved along optical axis direction, but be not limited to these methods about focus adjustment with respect to the limited distance object.
In addition, for employed aspheric surface among each embodiment, as is generally known that kind, with optical axis direction as the Z axle, under the situation of direction that will be vertical as the Y axle with optical axis, will be by the aspheric surface formula:
Z = ( Y 2 / R ) / [ 1 + { 1 - ( 1 + K ) ( Y / R ) 2 } ]
+ A · Y 4 + B · Y 6 + C · Y 8 + D · Y 10 + · · · ·
The curve of being given rotation and obtain curved surface around optical axis, and, through giving paraxial radius of curvature R, constant of the cone K, high order aspheric surface coefficient A, B, C, D and define shape.In addition, " E numeral back to back " expression " 10 tired taking advantage of " in the mark of the asphericity coefficient of the constant of the cone in the table and high order with it.For example, " E-04 " expression 10 -4, this numerical value is attached on the numerical value before it.
In the zoom lens of this embodiment; The 2nd lens combination and whole the 3rd lens combination with negative refracting power that the 1st lens combination, the integral body that has a negative refracting power by integral body in order from object side has positive refracting power constitute; Said the 1st lens combination through configuration as the 1st lens of negative lens, constitute as the 2nd lens of positive lens and as these three pieces of lens of the 3rd lens of negative lens; Said the 2nd lens combination through configuration as the 4th lens of positive lens, as the 5th lens of positive lens, constitute as the 6th lens of negative lens and as these 4 pieces of lens of the 7th lens of positive lens; Said the 3rd lens combination constitutes through the 8th lens of configuration as negative lens; About becoming doubly; Through move the position of said the 1st lens combination and said the 2nd lens combination along optical axis direction; Perhaps pass through except moving said the 1st lens combination and said the 2nd lens combination, also to move the position of said the 3rd lens combination, and accomplish the positive and negative formation of the optical power of each lens in the lens total system; Be negative, positive, negative, positive, positive and negative, positive and negative such, between said the 4th lens and said the 5th lens to be border and symmetrical structure, the amount for optical power also becomes the distribution of summary to becoming equally.
The invention still further relates to a kind of video camera, be equipped with above-described zoom lens its year.
The zoom lens of this embodiment; The 2nd lens combination and whole the 3rd lens combination with negative refracting power that the 1st lens combination, the integral body that has a negative refracting power by integral body in order from object side has positive refracting power constitute; Said the 1st lens combination integral body has negative refracting power; And constitute through disposing following lens: the 1st lens, it is lens with negative refracting power (below be called negative lens), and is to the protruding meniscus shape of object side; The 2nd lens, it is lens with positive refracting power (below be called positive lens), and is to the protruding meniscus shape of object side; And the 3rd lens; It is a negative lens, and said the 2nd lens combination integral body has positive refracting power, and through configuration as the 4th lens of positive lens, be negative lens and be to constitute to the 5th lens of the protruding meniscus shape of object side and as the 6th lens of positive lens; Said the 3rd lens combination integral body has negative refracting power; And constitute as the 7th lens of negative lens through configuration, about becoming doubly, through move the position of said the 1st lens combination and said the 2nd lens combination along optical axis direction; Perhaps except moving said the 1st lens combination and said the 2nd lens combination, also move the position of said the 3rd lens; And accomplish, the optical power that is had about said the 1st lens combination satisfies following conditional (16), satisfies following conditional (17) about the size of lens total system; In addition, the optical power that is had about said the 3rd lens combination satisfies following conditional (18):
(16)-0.8≤f w/f I≤-0.4
(17)4.5≤TL w/f w≤7.5
(18)-0.6≤f w/f III≤0
Wherein,
f w: the system-wide synthetic focal length of the lens in the wide-angle side;
f I: the synthetic focal length of the 1st lens combination;
f III: the synthetic focal length of the 3rd lens combination;
TL w: the distance (wherein, the parallel plane glass part is the air scaled distance) of image planes is arrived in the object side that constitutes the 1st lens of the 1st lens combination in the wide-angle side.
In above-mentioned zoom lens, said the 1st lens that constitute said the 1st lens combination are non-spherical lenses, the optical power that is had about said the 2nd lens; Satisfy following relational expression (19),, satisfy following conditional (20) about the dispersing characteristic in each lens that is allocated in the 1st lens combination; Refractive index about said the 2nd lens satisfies following conditional (21); Shape about the face of the picture side of said the 1st lens satisfies following conditional (22), in addition; Relative characteristic about the shape of the face of the object side of the face of the picture side of said the 1st lens and said the 2nd lens satisfies following conditional
(23)：
(19)0.25≤f w/f 2≤0.55
(20)15≤(υ 1+υ 3)/2-υ 2
(21)1.65≤n 2
(22)0.8≤f w/r 2≤1.5
(23)0.45≤r 2/r 3≤0.85
Wherein:
f 2: the focal length that constitutes the 2nd lens of the 1st lens combination;
υ 1: the Abbe number that constitutes the 1st lens of the 1st lens combination;
υ 2: the Abbe number that constitutes the 2nd lens of the 1st lens combination;
υ 3: the Abbe number that constitutes the 3rd lens of the 1st lens combination;
n 2: constitute the refractive index of the 2nd lens of the 1st lens combination to the d line;
r 2: the radius-of-curvature of face of picture side that constitutes the 1st lens of the 1st lens combination;
r 3: the radius-of-curvature of face of object side that constitutes the 2nd lens of the 1st lens combination.
In above-mentioned zoom lens; Constitute in the plane of refraction of each lens of said the 2nd lens combination; At least one plane of refraction is an aspherical shape, and the positive optical power that is had about said the 4th lens satisfies following conditional (24), and the negative optical power that is had about said the 5th lens satisfies following conditional (25); Dispersing characteristic about being distributed in each lens that constitutes said the 2nd lens combination satisfies following conditional (26); Likewise in the relation of the refractive index that these each lens had, satisfy following conditional (27), satisfy following conditional (28) about the shape of the face of the object side of said the 4th lens, in addition; Relativeness about the shape of the face of the picture side of the face of the object side of said the 4th lens and said the 6th lens, satisfy following conditional (29):
(24)0.65≤f w/f 4≤1.05
(25)-0.5≤f w/f 5≤-0.3
(26)25≤(υ 4+υ 6)/2-υ 5
(27)-0.45≤(n 4+n 6)/2-n 5≤-0.20
(28)0.8≤f w/r 7≤1.3
(29)-1.1≤r 7/r 12≤-0.7
Wherein:
f 4: the focal length that constitutes the 4th lens of the 2nd lens combination;
f 5: the focal length that constitutes the 5th lens of the 2nd lens combination;
υ 4: the Abbe number that constitutes the 4th lens of the 2nd lens combination;
υ 5: the Abbe number that constitutes the 5th lens of the 2nd lens combination;
υ 6: the Abbe number that constitutes the 6th lens of the 2nd lens combination;
n 4: constitute the refractive index of the 4th lens of the 2nd lens combination to the d line;
n 5: constitute the refractive index of the 5th lens of the 2nd lens combination to the d line;
n 6: constitute the refractive index of the 6th lens of the 2nd lens combination to the d line;
r 7: the radius-of-curvature of face of object side that constitutes the 4th lens of the 2nd lens combination;
r 12: the radius-of-curvature of face of picture side that constitutes the 6th lens of the 2nd lens combination.
In above-mentioned zoom lens, the shape about the face of the object side of said the 7th lens that constitute said the 3rd lens combination, satisfy following conditional (30):
(30)-1.2≤f w/r 13≤0.4
Wherein:
r 13: the radius-of-curvature of face of object side that constitutes the 7th lens of the 3rd lens combination.
The zoom lens of this embodiment; Also can; The 2nd lens combination and whole the 3rd lens combination with negative refracting power that the 1st lens combination, the integral body that has a negative refracting power by integral body in order from object side has positive refracting power constitute; Said the 1st lens combination through configuration as negative lens and be to the meniscus shape of object side protrusion the 1st lens, as positive lens and make to the 2nd lens of the protruding meniscus shape of object side and as these three pieces of lens of the 3rd lens of negative lens and constitute; Said the 2nd lens combination through configuration as the 4th lens of positive lens, as negative lens and for to the 5th lens of the protruding meniscus shape of object side, constitute as these three pieces of lens of the 6th lens of positive lens; Said the 3rd lens combination constitutes through the 7th lens of configuration as negative lens; About becoming doubly; Through move the position of said the 1st lens combination and said the 2nd lens combination along optical axis direction, perhaps accomplish the positive and negative formation of the optical power of each lens in the lens total system through the position of except moving said the 1st lens combination and said the 2nd lens combination, also moving said the 3rd lens combination; Be negative, positive, negative, positive, negative, positive, negative such, be center and symmetrical structure also becomes the distribution of summary symmetry equally for the amount of optical power with said the 4th lens.
The invention still further relates to a kind of video camera, be equipped with above-described zoom lens its year.
Table 18 shows numerical example with regard to the 17th embodiment of zoom lens of the present invention.In addition, Figure 33 is its lens pie graph, and Figure 34 is its all aberration diagram.In table and the drawing, f representes the focal length (following expression from the left side to the wide-angle side, the value of intermediate field, telescope end) of lens total system.In addition, F NoExpression F number (number), 2 ω represent the whole visual angle of lens.In addition, R representes radius-of-curvature, and D representes lens thickness or lens at interval, and Nd representes the refractive index with respect to the d line, υ dThe Abbe number of expression d line.D, g, C in the spherical aberration diagram in all aberration diagrams is respectively the aberration curve in the wavelength separately.In addition, S.C. representes sine condition.S among the astigmatism figure representes the sagitta of arc, and M representes メ リ デ イ オ Na Le.
[table 18]
Figure 200710005794010000200271
(embodiment 18)
Table 19 shows numerical example with regard to the 18th embodiment of zoom lens of the present invention.In addition, Figure 35 is its lens pie graph.Figure 36 is its all aberration diagram.
[table 19]
Figure 200710005794010000200281
(embodiment 19)
Table 20 shows numerical example with regard to the 19th embodiment of zoom lens of the present invention.In addition, Figure 37 is its lens pie graph.Figure 38 is its all aberration diagram.
[table 20]
Figure 200710005794010000200291
(embodiment 20)
Table 21 shows numerical example with regard to the 20th embodiment of zoom lens of the present invention.In addition, Figure 39 is its lens pie graph.Figure 40 is its all aberration diagram.
[table 21]
Figure 200710005794010000200301
(embodiment 21)
Table 22 shows numerical example with regard to the 21st embodiment of zoom lens of the present invention.In addition, Figure 41 is its lens pie graph.Figure 42 is all its aberration diagrams.
[table 22]
Figure 200710005794010000200311
(embodiment 22)
Table 23 shows numerical example with regard to the 22nd embodiment of zoom lens of the present invention.In addition, Figure 43 is its lens pie graph.Figure 44 is its all aberration diagram.
[table 23]
Figure 200710005794010000200321
(embodiment 23)
Table 24 shows numerical example with regard to the 23rd embodiment of zoom lens of the present invention.In addition, Figure 45 is its lens pie graph.Figure 46 is its all aberration diagram.
[table 24]
Figure 200710005794010000200331
(embodiment 24)
Table 25 shows numerical example with regard to the 24th embodiment of zoom lens of the present invention.In addition, Figure 47 is its lens pie graph.Figure 48 is its all aberration diagram.
[table 25]
Figure 200710005794010000200341
Next, and relatively, in table 26, gather expression from each embodiment of embodiment 17 to embodiment 24, with from conditional (16) to the corresponding value of conditional (20).
[table 26]
Figure 200710005794010000200351
That kind from table 26 is understood satisfies condition formula (16) to (30) with the relevant numerical value of each embodiment of embodiment 17 to 24, and that kind understood of the aberration diagram from each embodiment, and each aberration has all obtained good correction.

Claims (14)

1. zoom lens is characterized in that,
From object side; The 2nd lens combination and whole the 3rd lens combination with negative refracting power that the 1st lens combination, the integral body that has a negative refracting power by integral body in order has positive refracting power constitute; About becoming doubly; Through the position of said the 1st lens combination and said the 2nd lens combination is moved along optical axis direction; Perhaps accomplish,, satisfy following conditional (1) about the optical power that said the 1st lens combination is had through except moving said the 1st lens combination and said the 2nd lens combination, also moving said the 3rd lens combination; Size about the lens total system satisfies following conditional (2), and the optical power that is had about said the 3rd lens combination satisfies following conditional (3 '):
(1)-0.8≤f w/f I≤-0.45
(2)4.5≤TL w/f w≤7.5
(3’)-0.25≤f w/f III≤0
In the formula:
f w: the system-wide synthetic focal length of the lens in the wide-angle side;
f I: the synthetic focal length of the 1st lens combination;
f III: the synthetic focal length of the 3rd lens combination;
TL w: the face of the object side of the 1st lens of the 1st lens combination from constitute wide-angle side is to the distance of image planes, and wherein the parallel plane glass part is the air scaled distance.
2. zoom lens is characterized in that,
From object side; The 2nd lens combination and whole the 3rd lens combination with negative refracting power that the 1st lens combination, the integral body that has a negative refracting power by integral body in order has positive refracting power constitute; About becoming doubly; Through the position of said the 1st lens combination and said the 2nd lens combination is moved along optical axis direction; Perhaps accomplish,, satisfy following conditional (1) about the optical power that said the 1st lens combination is had through except moving said the 1st lens combination and said the 2nd lens combination, also moving said the 3rd lens combination; Size about the lens total system satisfies following conditional (2), and the optical power that is had about said the 3rd lens combination satisfies following conditional (3):
(1)-0.8≤f w/f I≤-0.45
(2)4.5≤TL w/f w≤7.5
(3)-0.55≤f w/f III≤0
In the formula:
f w: the system-wide synthetic focal length of the lens in the wide-angle side;
f I: the synthetic focal length of the 1st lens combination;
f III: the synthetic focal length of the 3rd lens combination;
TL w: the face of the object side of the 1st lens of the 1st lens combination from constitute wide-angle side is to the distance of image planes, and wherein the parallel plane glass part is the air scaled distance,
And, said the 1st lens combination, through constituting by following lens in order from object side: i.e. the 1st lens, it is the lens with negative refracting power; The 2nd lens, it is the lens with positive refracting power; The 3rd lens, it has negative refracting power, the optical power that is had about said the 2nd lens; Satisfy following conditional (4); About the dispersing characteristic in each lens that is allocated in said the 1st lens combination, satisfy following conditional (5), satisfy following conditional (6) about the refractive index of said the 2nd lens:
(4)0.22≤f w/f 2≤0.55
(5)15≤(υ 1+υ 3)/2-υ 2
(6)1.65≤n 2
Wherein:
f 2: the focal length that constitutes the 2nd lens of the 1st lens combination;
υ 1: the Abbe number that constitutes the 1st lens of the 1st lens combination;
υ 2: the Abbe number that constitutes the 2nd lens of the 1st lens combination;
υ 3: the Abbe number that constitutes the 3rd lens of the 1st lens combination;
n 2: the 2nd lens of 1 lens combination of formation are to the refractive index of d line.
3. zoom lens according to claim 2 is characterized in that,
Said the 1st lens that constitute said the 1st lens combination are non-spherical lenses; The shape as the face of side about said the 1st lens satisfies following conditional (7), satisfies following conditional (8) with the relative characteristic of the shape of the face of the object side of said the 2nd lens that constitute said the 1st lens combination:
(7)0.4≤f w/r 2≤1.4
(8)0≤r 2/r 3≤1.5
Wherein:
r 2: the radius-of-curvature of face of picture side that constitutes the 1st lens of the 1st lens combination;
r 3: the radius-of-curvature of face of object side that constitutes the 2nd lens of the 1st lens combination.
4. zoom lens is characterized in that,
From object side; The 2nd lens combination and whole the 3rd lens combination with negative refracting power that the 1st lens combination, the integral body that has a negative refracting power by integral body in order has positive refracting power constitute; About becoming doubly; Through the position of said the 1st lens combination and said the 2nd lens combination is moved along optical axis direction; Perhaps accomplish,, satisfy following conditional (1) about the optical power that said the 1st lens combination is had through except moving said the 1st lens combination and said the 2nd lens combination, also moving said the 3rd lens combination; Size about the lens total system satisfies following conditional (2), and the optical power that is had about said the 3rd lens combination satisfies following conditional (3):
(1)-0.8≤f w/f I≤-0.45
(2)4.5≤TL w/f w≤7.5
(3)-0.55≤f w/f III≤0
In the formula:
f w: the system-wide synthetic focal length of the lens in the wide-angle side;
f I: the synthetic focal length of the 1st lens combination;
f III: the synthetic focal length of the 3rd lens combination;
TL w: the face of the object side of the 1st lens of the 1st lens combination from constitute wide-angle side is to the distance of image planes, and wherein the parallel plane glass part is the air scaled distance,
And; Said the 1st lens that constitute said the 1st lens combination are non-spherical lenses; The shape as the face of side about said the 1st lens satisfies following conditional (7), satisfies following conditional (8) with the relative characteristic of the shape of the face of the object side of the 2nd lens that constitute said the 1st lens combination:
(7)0.4≤f w/r 2≤1.4
(8)0≤r 2/r 3≤1.5
Wherein:
r 2: the radius-of-curvature of face of picture side that constitutes the 1st lens of the 1st lens combination;
r 3: the radius-of-curvature of face of object side that constitutes the 2nd lens of the 1st lens combination.
5. zoom lens is characterized in that,
From object side; The 2nd lens combination and whole the 3rd lens combination with negative refracting power that the 1st lens combination, the integral body that has a negative refracting power by integral body in order has positive refracting power constitute; About becoming doubly; Through the position of said the 1st lens combination and said the 2nd lens combination is moved along optical axis direction; Perhaps accomplish,, satisfy following conditional (1) about the optical power that said the 1st lens combination is had through except moving said the 1st lens combination and said the 2nd lens combination, also moving said the 3rd lens combination; Size about the lens total system satisfies following conditional (2), and the optical power that is had about said the 3rd lens combination satisfies following conditional (3):
(1)-0.8≤f w/f I≤-0.45
(2)4.5≤TL w/f w≤7.5
(3)-0.55≤f w/f III≤0
In the formula:
f w: the system-wide synthetic focal length of the lens in the wide-angle side;
f I: the synthetic focal length of the 1st lens combination;
f III: the synthetic focal length of the 3rd lens combination;
TL w: the face of the object side of the 1st lens of the 1st lens combination from constitute wide-angle side is to the distance of image planes, and wherein the parallel plane glass part is the air scaled distance,
And; Said the 2nd lens combination; Through disposing as the 4th lens, as the 5th lens from object side in order, constituting as the 6th lens of lens and as the 7th lens with lens of positive refracting power with negative refracting power with lens of positive refracting power with lens of positive refracting power; The positive synthesizing optical ability that is had about said the 4th lens and said the 5th lens satisfies following conditional (9); Negative optical power about the 6th lens are had satisfies following conditional (10), satisfies following conditional (11) about the dispersing characteristic that is allocated in said the 4th lens that dispose in order from object side in said the 2nd lens combination, said the 5th lens and said the 6th lens; In the relation of the refractive index that these each lens had, satisfy following conditional (12):
(9)0.5≤f w/f 4、5≤1.5
(10)-1.5≤f w/f 6≤-0.25
(11)28≤(υ 4+υ 5)/2-υ 6
(12)(n 4+n 5)/2-n 6≤-0.24
Wherein,
f 4,5: constitute the 4th lens of the 2nd lens combination and the synthetic focal length of the 5th lens;
f 6: constitute the focal length of the 6th lens of the 2nd lens combination,
Wherein, under constituting the situation of compound non-spherical lens, the 6th lens are the synthetic focal length of parent spherical lens and resin part;
υ 4: the Abbe number that constitutes the 4th lens of the 2nd lens combination;
υ 5: the Abbe number that constitutes the 5th lens of the 2nd lens combination;
υ 6: constitute the Abbe number of the 6th lens of the 2nd lens combination,
Wherein, be that the glass material of parent spherical lens is the Abbe number of nitre material under the 6th lens constitute the situation of compound non-spherical lens;
n 4: constitute the refractive index of the 4th lens of the 2nd lens combination to the d line;
n 5: constitute the refractive index of the 5th lens of the 2nd lens combination to the d line;
n 6: constitute the refractive index of the 6th lens of the 2nd lens combination to the d line.
6. zoom lens according to claim 5 is characterized in that,
Constitute in the plane of refraction of each lens of said the 2nd lens combination; Having a face at least is aspherical shape, and the shape about the face of the object side of said the 4th lens satisfies following conditional (13); In addition, the shape as the face of side about said the 6th lens satisfies following conditional (14):
(13)0.2≤f w/r 7≤1.0
(14)0.4≤f w/r 12≤1.6
Wherein:
r 7: the radius-of-curvature of face of object side that constitutes the 4th lens of the 2nd lens combination;
r 12: constitute the radius-of-curvature of face of picture side of the 6th lens of the 2nd lens combination,
Wherein, be under the situation of resin lens face of compound lens at the face as side of the 6th lens, be the radius-of-curvature of the boundary surface between resin and the air.
7. zoom lens is characterized in that,
From object side; The 2nd lens combination and whole the 3rd lens combination with negative refracting power that the 1st lens combination, the integral body that has a negative refracting power by integral body in order has positive refracting power constitute; About becoming doubly; Through the position of said the 1st lens combination and said the 2nd lens combination is moved along optical axis direction; Perhaps accomplish,, satisfy following conditional (1) about the optical power that said the 1st lens combination is had through except moving said the 1st lens combination and said the 2nd lens combination, also moving said the 3rd lens combination; Size about the lens total system satisfies following conditional (2), and the optical power that is had about said the 3rd lens combination satisfies following conditional (3):
(1)-0.8≤f w/f I≤-0.45
(2)4.5≤TL w/f w≤7.5
(3)-0.55≤f w/f III≤0
In the formula:
f w: the system-wide synthetic focal length of the lens in the wide-angle side;
f I: the synthetic focal length of the 1st lens combination;
f III: the synthetic focal length of the 3rd lens combination;
TL w: the face of the object side of the 1st lens of the 1st lens combination from constitute wide-angle side is to the distance of image planes, and wherein the parallel plane glass part is the air scaled distance,
And; Constitute in the plane of refraction of each lens of said the 2nd lens combination; Having a face at least is aspherical shape; Shape about the face of the object side of the 4th lens that constitute said the 2nd lens combination satisfies following conditional (13), satisfies following conditional (14) about the shape as the face of side of the 6th lens that constitute said the 2nd lens combination:
(13)0.2≤f w/r 7≤1.0
(14)0.4≤f w/r 12≤1.6
Wherein:
r 7: the radius-of-curvature of face of object side that constitutes the 4th lens of the 2nd lens combination;
r 12: constitute the radius-of-curvature of face of picture side of the 6th lens of the 2nd lens combination,
Wherein, be under the situation of resin lens face of compound lens at the face as side of the 6th lens, be the radius-of-curvature of the boundary surface between resin and the air.
8. zoom lens is characterized in that,
From object side; The 2nd lens combination and whole the 3rd lens combination with negative refracting power that the 1st lens combination, the integral body that has a negative refracting power by integral body in order has positive refracting power constitute; About becoming doubly; Through the position of said the 1st lens combination and said the 2nd lens combination is moved along optical axis direction; Perhaps accomplish,, satisfy following conditional (1) about the optical power that said the 1st lens combination is had through except moving said the 1st lens combination and said the 2nd lens combination, also moving said the 3rd lens combination; Size about the lens total system satisfies following conditional (2), and the optical power that is had about said the 3rd lens combination satisfies following conditional (3):
(1)-0.8≤f w/f I≤-0.45
(2)4.5≤TL w/f w≤7.5
(3)-0.55≤f w/f III≤0
In the formula:
f w: the system-wide synthetic focal length of the lens in the wide-angle side;
f I: the synthetic focal length of the 1st lens combination;
f III: the synthetic focal length of the 3rd lens combination;
TL w: the face of the object side of the 1st lens of the 1st lens combination from constitute wide-angle side is to the distance of image planes, and wherein the parallel plane glass part is the air scaled distance,
And said the 3rd lens combination is by constituting as the 8th lens with negative refractive power lens, and the shape about the face of the object side of said the 8th lens satisfies following conditional (15):
(15)-2.0≤f w/r 15≤0.2
Wherein:
r 15: the radius-of-curvature of face of object side that constitutes the 8th lens of the 3rd lens combination.
9. a video camera is equipped with the described zoom lens of claim 1 its year.
10. zoom lens is characterized in that,
The 2nd lens combination and whole the 3rd lens combination with negative refracting power that the 1st lens combination, the integral body that has a negative refracting power by integral body in order from object side has positive refracting power constitute; Said the 1st lens combination integral body has negative refracting power; And constitute: the 1st lens through disposing following lens; It is the lens with negative refracting power, and is to the protruding meniscus shape of object side; The 2nd lens, it is the lens with positive refracting power, and is to the protruding meniscus shape of object side; And the 3rd lens; It is the lens with negative refracting power; Said the 2nd lens combination integral body has positive refracting power; And through configuration as the 4th lens with lens of positive refracting power, be to have the lens of negative refracting power and be to constitute that said the 3rd lens combination integral body has negative refracting power, and constitutes as the 7th lens with lens of negative refracting power through configuration to the 5th lens of the protruding meniscus shape of object side and as the 6th lens with lens of positive refracting power; About becoming doubly; Through move the position of said the 1st lens combination and said the 2nd lens combination along optical axis direction, perhaps to accomplish through the position of except moving said the 1st lens combination and said the 2nd lens combination, also moving said the 3rd lens, the optical power that is had about said the 1st lens combination satisfies following conditional (16); Size about the lens total system satisfies following conditional (17), and the optical power that is had about said the 3rd lens combination satisfies following conditional (18):
(16)-0.8≤f w/f I≤-0.4
(17)4.5≤TL w/f w≤7.5
(18)-0.6≤f w/f III≤0
In the formula,
f w: the system-wide synthetic focal length of the lens in the wide-angle side;
f I: the synthetic focal length of the 1st lens combination;
f III: the synthetic focal length of the 3rd lens combination;
TL w: the distance of image planes is arrived in the object side that constitutes the 1st lens of the 1st lens combination in the wide-angle side, and wherein the parallel plane glass part is the air scaled distance.
11. zoom lens according to claim 10 is characterized in that,
Said the 1st lens that constitute said the 1st lens combination are non-spherical lenses; About the optical power that said the 2nd lens are had, satisfy following relational expression (19), about the dispersing characteristic in each lens that is allocated in the 1st lens combination; Satisfy following conditional (20); Refractive index about said the 2nd lens satisfies following conditional (21), and the shape about the face of the picture side of said the 1st lens satisfies following conditional (22); Relative characteristic about the shape of the face of the object side of the face of the picture side of said the 1st lens and said the 2nd lens, satisfy following conditional (23):
(19)0.25≤f w/f 2≤0.55
(20)15≤(υ 1+υ 3)/2-υ 2
(21)1.65≤n 2
(22)0.8≤f w/r 2≤1.5
(23)0.45≤r 2/r 3≤0.85
Wherein:
f 2: the focal length that constitutes the 2nd lens of the 1st lens combination;
υ 1: the Abbe number that constitutes the 1st lens of the 1st lens combination;
υ 2: the Abbe number that constitutes the 2nd lens of the 1st lens combination;
υ 3: the Abbe number that constitutes the 3rd lens of the 1st lens combination;
n 2: constitute the refractive index of the 2nd lens of the 1st lens combination to the d line;
r 2: the radius-of-curvature of face of picture side that constitutes the 1st lens of the 1st lens combination;
r 3: the radius-of-curvature of face of object side that constitutes the 2nd lens of the 1st lens combination.
12. zoom lens according to claim 10 is characterized in that,
Constitute in the plane of refraction of each lens of said the 2nd lens combination; At least one plane of refraction is an aspherical shape; The positive optical power that is had about said the 4th lens satisfies following conditional (24); The negative optical power that is had about said the 5th lens satisfies following conditional (25); Dispersing characteristic about being distributed in each lens that constitutes said the 2nd lens combination satisfies following conditional (26), in the relation of the refractive index that these each lens had, satisfies following conditional (27), satisfies following conditional (28) about the shape of the face of the object side of said the 4th lens; Relativeness about the shape of the face of the picture side of the face of the object side of said the 4th lens and said the 6th lens, satisfy following conditional (29):
(24)0.65≤f w/f 4≤1.05
(25)-0.5≤f w/f 5≤-0.3
(26)25≤(υ 4+υ 6)/2-υ 5
(27)-0.45≤(n 4+n 6)/2-n 5≤-0.20
(28)0.8≤f w/r 7≤1.3
(29)-1.1≤r 7/r 12≤-0.7
Wherein:
f 4: the focal length that constitutes the 4th lens of the 2nd lens combination;
f 5: the focal length that constitutes the 5th lens of the 2nd lens combination;
υ 4: the Abbe number that constitutes the 4th lens of the 2nd lens combination;
υ 5: the Abbe number that constitutes the 5th lens of the 2nd lens combination;
υ 6: the Abbe number that constitutes the 6th lens of the 2nd lens combination;
n 4: constitute the refractive index of the 4th lens of the 2nd lens combination to the d line;
n 5: constitute the refractive index of the 5th lens of the 2nd lens combination to the d line;
n 6: constitute the refractive index of the 6th lens of the 2nd lens combination to the d line;
r 7: the radius-of-curvature of face of object side that constitutes the 4th lens of the 2nd lens combination;
r 12: the radius-of-curvature of face of picture side that constitutes the 6th lens of the 2nd lens combination.
13. the zoom lens according to claim 10 is characterized in that,
Shape about the face of the object side of said the 7th lens that constitute said the 3rd lens combination, satisfy following conditional (30):
(30)-1.2≤f w/r 13≤0.4
Wherein:
r 13: the radius-of-curvature of face of object side that constitutes the 7th lens of the 3rd lens combination.
14. a video camera is equipped with the described zoom lens of claim 10 its year.
CN2007100057940A 2006-02-13 2007-02-13 Zoom lens and camera with zoom lens Expired - Fee Related CN101021609B (en)

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