CN101672976B - A zoom lens and camera device - Google Patents
A zoom lens and camera device Download PDFInfo
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- CN101672976B CN101672976B CN2009101655071A CN200910165507A CN101672976B CN 101672976 B CN101672976 B CN 101672976B CN 2009101655071 A CN2009101655071 A CN 2009101655071A CN 200910165507 A CN200910165507 A CN 200910165507A CN 101672976 B CN101672976 B CN 101672976B
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Abstract
The invention provides a zoom lens and camera device of small-size with good optical performance and low cost. The zoom lens is composed of a first lens assembly (G1), a second lens assembly (G2), a third lens assembly (G3) and a forth lens assembly (G4) from the object side in series, which zooms by changing interval in each group. All groups from the first lens assembly (G1) to the forth lens assembly (G4) comprise lens made of resin. The first lens assembly (G1) as a whole has a positive focal power, and is provided with a negative meniscus lens (L11), aright-angle prism (LP) that bends light path about 90 degree, and a positive lens (L13) made of resin that sets at least one surface to be aspheric surface. Satisfying the following conditional expression (1/P1+1/P2+1/P3+1/P4)<0.1 (1). Wherein, P1 to P4 are within each group from the first lens assembly G1 to the forth lens assembly G4, the shortest focal distance with focal distance absolute value is made of lens that made by resin.
Description
Technical field
The present invention relates to a kind of zoom lens and camera head that in the especially digital static video camera of the mini-plant with camera function, the mobile phone of being with video camera and information portable terminal device (PDA:Personal DigitalAssistance) etc., is suitable for using.
Background technology
In recent years, in camera heads such as the static video camera of number, miniaturization development along with CCD (ChargeCoupled Device) or CMOS imaging apparatuss such as (Complementary Metal Oxide Semiconductor) requires further miniaturization as device integral body.Therefore, develop the camera head of the slimming of the depth direction when adopting light path with lens combination the so-called bending optical system of bending is sought to be assembled in camera head halfway recently.
As the zoom lens that use bending optical system, record following zoom lens at patent documentation 1, promptly, constitute by the 1st lens combination with positive refracting power, the 2nd lens combination, the 3rd lens combination, the 4th lens combination with positive refracting power successively from the thing side, become doubly by moving the 2nd negative lens combination and the 4th positive lens combination with positive refracting power with negative refracting power.In these zoom lens, by in the 1st lens combination, disposing prism, thereby with about 90 ° of light path bending.And, in the 1st lens combination, in the fixing positive lens groups of the back of prism configuration.
Patent documentation 1: the open 2000-131610 communique of Jap.P.
As above-mentioned, by using bending optical system, the slimming of the depth direction in the time of can seeking to be assembled in camera head is so be equipped on the various picture pick-up devices beginning in recent years.On the other hand, in market, require to require cost degradation in the slimming.Therefore, wish to develop the bending optical system of seeking slimming and making structure favourable on the cost.In order to seek cost degradation, consider on lens material, to use resin material, but when using resin lens, its based on the characteristic variations of temperature greater than glass lens, so preferably take into full account the structure of temperature characterisitic.The bending optical system in past, known have for example in patent documentation 1 described 4 groups of Zoom structures, for example use the bending optical system of resin lens, but, can consider also actively to use resin lens in the other lenses group in order further to seek cost degradation in the 3rd lens combination or the 4th lens combination.
Summary of the invention
The present invention is referred from this problem points and proposes, and its purpose is, provides a kind of small-sized and keep the good optical performance and can seek the zoom lens and the camera head of cost degradation.
Zoom lens according to the present invention possess the 1st lens combination, the 2nd lens combination, the 3rd lens combination successively at least, reach the 4th lens combination from the thing side, become doubly at interval by each group that changes the 1st lens combination to the 4 lens combination; The 1st lens combination has positive focal power as a whole, and has the reflection part of negative meniscus lens, bending light path successively, is made as the aspheric positive lens that is made of resin material to major general's 1 face from the thing side; The 2nd lens combination has negative focal power as a whole, and has the negative lens that is made of resin material in the most close thing side; The 3rd lens combination is made of the positive lens that is made as aspheric resin material to major general's 1 face; The 4th lens combination has positive focal power as a whole, and has the non-spherical lens that at least 1 face is made as aspheric resin material in the most close image planes side.And, constitute the formula of meeting the following conditions.In the formula, P1 is illustrated in the shortest focal length of lens (mm) of lens mid-focal length absolute value that is made of resin material in the 1st lens combination.P2 is illustrated in the shortest focal length of lens (mm) of lens mid-focal length absolute value that is made of resin material in the 2nd lens combination.P3 is illustrated in the shortest focal length of lens (mm) of lens mid-focal length absolute value that is made of resin material in the 3rd lens combination.P4 is illustrated in the shortest focal length of lens (mm) of lens mid-focal length absolute value that is made of resin material in the 4th lens combination.
|1/P1+1/P2+1/P3+1/P4|＜0.1……(1)
In zoom lens according to the present invention, make by being configured in reflection part in the 1st lens combination and the structure of the bending optical system of bending light path, thereby while keeping the length that the good optical performance suppresses the thickness direction of optical system, the slimming of the depth direction when being assembled in camera head easily.And, by in all groups of the 1st lens combination to the 4 lens combination, suitably disposing resin lens, thereby while keep small-sized and the good optical performance is sought cost degradation easily.Especially, refracting power about the resin lens in each group, by the proper conditions as a whole of a plurality of resin lens in the 1st lens combination to the 4 lens combination, thereby a plurality of resin lens in the 1st lens combination to the 4 lens combination according to as a whole mutually the mode of compensation temperature work, suppress the flutter that causes by temperature variation well while use a plurality of resin lens to seek cost degradation.
And, further satisfy following preferred construction by suitable employing, more help cost degradation when can make optical property better.
Preferably according to the zoom lens of the present invention formula that further meets the following conditions.In the formula, fw represents the focal length of the total system of wide-angle side, and f2 represents the focal length of the 2nd lens combination.
0.8＜|f2/fw|＜1.2……(2)
In zoom lens according to the present invention, the negative lens of the most close thing side in preferred the 2nd lens combination is a biconcave lens.
And in zoom lens according to the present invention, the non-spherical lens of the most close picture side in preferred the 4th lens combination is with the meniscus shape of convex surface towards the thing side.
Camera head according to the present invention possesses: according to zoom lens of the present invention, output and imaging apparatus by the corresponding image pickup signal of the optical image of this zoom lens formation.
In camera head according to the present invention, used as imaging lens system and of the present inventionly to have sought the high performance zoom lens of small-sized, cost degradation and seek miniaturization and cost degradation as device integral body.
According to zoom lens of the present invention, make the structure that helps miniaturization as bending optical system, and in all groups of the 1st lens combination to the 4 lens combination, suitably use resin lens, so keep small-sized and good optical performance and can seek cost degradation.
And, according to camera head of the present invention, used the high performance zoom lens small-sized, cost degradation of seeking of the invention described above, so keep good shooting performance and can seek miniaturization and cost degradation as device integral body as imaging lens system.
Description of drawings
Fig. 1 represents the 1st structure example of the zoom lens that one embodiment of the present invention is related, is the lens profile figure corresponding to embodiment 1.
Fig. 2 represents the 2nd structure example of the zoom lens that one embodiment of the present invention is related, is the lens profile figure corresponding to embodiment 2.
Fig. 3 represents the 3rd structure example of the zoom lens that one embodiment of the present invention is related, is the lens profile figure corresponding to embodiment 3.
Fig. 4 represents the 4th structure example of the zoom lens that one embodiment of the present invention is related, is the lens profile figure corresponding to embodiment 4.
Fig. 5 represents the 5th structure example of the zoom lens that one embodiment of the present invention is related, is the lens profile figure corresponding to embodiment 5.
Fig. 6 represents the 6th structure example of the zoom lens that one embodiment of the present invention is related, is the lens profile figure corresponding to embodiment 6.
Fig. 7 is the figure of the lens data of the related zoom lens of expression embodiment 1, (A) represents basic lens data, and (B) expression is followed and become doubly and the face of the part that moves data at interval.
The figure of Fig. 8 data that to be expression relevant with the aspheric surface of the related zoom lens of embodiment 1.
Fig. 9 is the figure of the lens data of the related zoom lens of expression embodiment 2, (A) represents basic lens data, and (B) expression is followed and become doubly and the face of the part that moves data at interval.
The figure of Figure 10 data that to be expression relevant with the aspheric surface of the related zoom lens of embodiment 2.
Figure 11 is the figure of the lens data of the related zoom lens of expression embodiment 3, (A) represents basic lens data, and (B) expression is followed and become doubly and the face of the part that moves data at interval.
The figure of Figure 12 data that to be expression relevant with the aspheric surface of the related zoom lens of embodiment 3.
Figure 13 is the figure of the lens data of the related zoom lens of expression embodiment 4, (A) represents basic lens data, and (B) expression is followed and become doubly and the face of the part that moves data at interval.
The figure of Figure 14 data that to be expression relevant with the aspheric surface of the related zoom lens of embodiment 4.
Figure 15 is the figure of the lens data of the related zoom lens of expression embodiment 5, (A) represents basic lens data, and (B) expression is followed and become doubly and the face of the part that moves data at interval.
The figure of Figure 16 data that to be expression relevant with the aspheric surface of the related zoom lens of embodiment 5.
Figure 17 is the figure of the lens data of the related zoom lens of expression embodiment 6, (A) represents basic lens data, and (B) expression is followed and become doubly and the face of the part that moves data at interval.
The figure of Figure 18 data that to be expression relevant with the aspheric surface of the related zoom lens of embodiment 6.
Figure 19 is the figure that each embodiment conclusive table is shown with the value of closing conditional.
Figure 20 is the aberration diagram at the various aberrations of wide-angle side of the related zoom lens of expression embodiment 1, and (A) expression spherical aberration, (B) expression astigmatism, (C) represents to distort.
Figure 21 is the aberration diagram at the various aberrations of telescope end of the related zoom lens of expression embodiment 1, and (A) expression spherical aberration, (B) expression astigmatism, (C) represents to distort.
Figure 22 is the aberration diagram at the various aberrations of wide-angle side of the related zoom lens of expression embodiment 2, and (A) expression spherical aberration, (B) expression astigmatism, (C) represents to distort.
Figure 23 is the aberration diagram at the various aberrations of telescope end of the related zoom lens of expression embodiment 2, and (A) expression spherical aberration, (B) expression astigmatism, (C) represents to distort.
Figure 24 is the aberration diagram at the various aberrations of wide-angle side of the related zoom lens of expression embodiment 3, and (A) expression spherical aberration, (B) expression astigmatism, (C) represents to distort.
Figure 25 is the aberration diagram at the various aberrations of telescope end of the related zoom lens of expression embodiment 3, and (A) expression spherical aberration, (B) expression astigmatism, (C) represents to distort.
Figure 26 is the aberration diagram at the various aberrations of wide-angle side of the related zoom lens of expression embodiment 4, and (A) expression spherical aberration, (B) expression astigmatism, (C) represents to distort.
Figure 27 is the aberration diagram at the various aberrations of telescope end of the related zoom lens of expression embodiment 4, and (A) expression spherical aberration, (B) expression astigmatism, (C) represents to distort.
Figure 28 is the aberration diagram at the various aberrations of wide-angle side of the related zoom lens of expression embodiment 5, and (A) expression spherical aberration, (B) expression astigmatism, (C) represents to distort.
Figure 29 is the aberration diagram at the various aberrations of telescope end of the related zoom lens of expression embodiment 5, and (A) expression spherical aberration, (B) expression astigmatism, (C) represents to distort.
Figure 30 is the aberration diagram at the various aberrations of wide-angle side of the related zoom lens of expression embodiment 6, and (A) expression spherical aberration, (B) expression astigmatism, (C) represents to distort.
Figure 31 is the aberration diagram at the various aberrations of telescope end of the related zoom lens of expression embodiment 6, and (A) expression spherical aberration, (B) expression astigmatism, (C) represents to distort.
Figure 32 is the key diagram of bending optical system.
Figure 33 is the front side outside drawing of expression as a structure example of the Digital Video of the related camera head of one embodiment of the present invention.
Figure 34 is the rear side outside drawing of expression as a structure example of the Digital Video of the related camera head of one embodiment of the present invention.
Among the figure: GC-optics, G1-the 1st lens combination, G2-the 2nd lens combination, G3-the 3rd lens combination, G4-the 4th lens combination, LP-right-angle prism, St-aperture diaphragm, Ri-is from the radius-of-curvature of i lens face of thing side, and Di-is from thing side i the face interval with i+1 lens face, Z1-optical axis.
Embodiment
Below, with reference to accompanying drawing embodiments of the present invention are described in detail.
Fig. 1 (A), (B) represent the 1st structure example of the zoom lens that one embodiment of the present invention is related.This structure example is corresponding to the 1st numerical value embodiment (Fig. 7 (A), (B) and lens arrangement Fig. 8) described later.In addition, Fig. 1 (A) is corresponding to the optical system configurations at wide-angle side (shortest focal length state), and Fig. 1 (B) is corresponding to the optical system configurations at telescope end (longest focal length state).Equally, represent cross-section structure at Fig. 2 (A), (B)～Fig. 6 (A), (B) corresponding to the 2nd to the 6th structure example of the lens arrangement of the 2nd to the 6th numerical value embodiment described later.In Fig. 1 (A), (B)～Fig. 6 (A), (B), symbol Ri represents that the face with the textural element of the most close thing side is the 1st and basis increase i face enclosing symbol successively towards picture side (imaging side) a radius-of-curvature.Symbol Di represent on the optical axis Z1 of i face and i+1 face face at interval.And, only face interval D 8, D13, D16, a D21 along with the change times part that changes are enclosed symbol about symbol Di.In addition, the basic structure of each structure example is all identical, thus following with the 1st structure example shown in Fig. 1 (A), (B) as describing substantially.
These zoom lens can carry and be used in the mini-plant with camera function, the mobile phone of the static video camera of number for example described later (Figure 33, Figure 34), band camera and PDA etc.These zoom lens possess the 1st lens combination G1, the 2nd lens combination G2, the 3rd lens combination G3 successively, regulate aperture diaphragm St, the 4th lens combination G4 of light quantity along optical axis Z1 from the thing side.
At not shown imaging apparatuss such as the imaging surface Simg of these zoom lens configuration CCD.Imaging apparatus output and the corresponding image pickup signal of optical image that forms by these zoom lens.At least constitute camera head in the present embodiment by these zoom lens and imaging apparatus.Also can be between the 4th lens combination G4 and imaging apparatus, according to the various optics GC of structural arrangements of the camera side of loading lens.For example, also configurable shooting face is protected with tabular opticses such as cover glass or infrared intercepting filter.
At this moment, as optics GC, for example can use the tabular cover glass is applied the optics that infrared intercepting filter or ND optical filter etc. have the coating of filter effect.And, in this imaging lens system, all lens that also can be in each lens combination or apply the coating of filter effects such as having infrared intercepting filter or ND optical filter or the coating that prevents to reflect at 1 lens face at least.
These zoom lens become doubly at interval by changing each group.In more detail, the 1st lens combination G1 and the 3rd lens combination G3 are fixing all the time when becoming times, and the 2nd lens combination G2 and the 4th lens combination G4 move on optical axis Z1 when becoming times.This zoom lens are according to becoming doubly to telescope end from wide-angle side, and each moves group according to being moved by the mode of the track shown in the solid line to the state of Fig. 1 (B) and describing to publish picture from the state of Fig. 1 (A).In the case, the 2nd lens combination G2 mainly takes on doubly effect of change, and the 4th lens combination G4 takes on the corrective action of following change image planes doubly to change.
These zoom lens have resin lens in all groups of the 1st lens combination G1 and the 4th lens combination G4.And, also can in each lens combination, use non-spherical lens as required.When being made as non-spherical lens, if use resin material to be shaped, then processability is good and can seek cost degradation, so non-spherical lens is preferably resin lens.
The 1st lens combination G1 has positive focal power as a whole.The 1st lens combination G1 has successively from the thing side: negative meniscus lens, with the reflection part of about 90 degree of light path bending, be made as the aspheric positive lens that is made of resin material to major general's 1 face.More specifically, shown in Fig. 1 (A), (B), the 1st lens combination G1 for example comprises convex surface towards the negative meniscus lens L11 of thing side, the right-angle prism LP as reflection part, 2 positive lens L12, L13 successively from the thing side.In the 1st lens combination G1, preferred the most close positive lens L13 as side is made as aspheric resin lens to major general's 1 face.
In addition, the related zoom lens of present embodiment are bending optical system, in fact shown in figure 32, in the 1st lens combination G1, for example by the internal reflection surface of right-angle prism LP with about 90 ° of light path bending.In Fig. 1 (A), (B)～Fig. 6 (A), (B), omit the internal reflection surface of prism LP and same direction on optical axis Z1 is launched.In addition, replace right-angle prism LP also can use other reflection parts such as catoptron.
The 2nd lens combination G2 integral body has negative focal power.The 2nd lens combination G2 has the negative lens that is made of resin material in the most close thing side.More specifically, shown in Fig. 1 (A), (B), the 2nd lens combination G2 for example comprises successively from the thing side: the negative lens L21 of the concave-concave that is made of resin material and the joint lens that are made of the negative lens L22 and the positive lens L23 of concave-concave.
The 3rd lens combination G3 has the positive lens that the thing side is made as convex surface.More specifically, shown in Fig. 1 (A), (B), 1 positive lens L31 that preferred the 3rd lens combination G3 for example is made as the thing side convex surface constitutes.Preferred positive lens L31 is made as the non-spherical lens of resin material.
When the 4th lens combination G4 integral body has positive focal power, has the non-spherical lens that at least 1 face is made as aspheric resin material as side the most close.The non-spherical lens of preferred this most close picture side is with the meniscus shaped lens of convex surface towards the plus or minus of thing side.More specifically, shown in Fig. 1 (A), (B), the 4th lens combination G4 comprises successively from the thing side: joint lens that are made of 2 lens L41, L42 and by the meniscus shaped lens L43 that convex surface is constituted towards the non-spherical lens of the resin material of thing side.In addition, meniscus shaped lens L43 is in the 1st to the 5th structure example (Fig. 1 (A), (B)～Fig. 5 (A), (B)), it is near the meniscus shaped lens that optical axis, has negative refracting power, in the 6th structure example (Fig. 6 (A), (B)), be near the positive meniscus shaped lens that optical axis, has negative refracting power.
These zoom lens formula (1) that meets the following conditions.In the present embodiment, in each group of the 1st lens combination G1 to the 4 lens combination G4, has at least 1 resin lens respectively.In conditional (1), P1～P4 is illustrated in each group of the 1st lens combination G1 to the 4 lens combination G4, the focal length of the lens that the focal length absolute value is the shortest (mm).For example, P1 represents the focal length of the positive lens L13 in the 1st lens combination G1, and P2 represents the focal length of the negative lens L21 in the 2nd lens combination G2, and P3 represents the focal length of the positive lens L31 in the 3rd lens combination G3, and P4 represents the focal length of the meniscus shaped lens L43 in the 4th lens combination G4.
|1/P1+1/P2+1/P3+1/P4|＜0.1……(1)
Preferred these zoom lens formula (2) that also meets the following conditions.In the formula, fw is illustrated in the focal length of the total system of wide-angle side, and f2 represents the focal length of the 2nd lens combination G2.
0.8＜|f2/fw|＜1.2……(2)
Figure 33 and Figure 34 are as an example expression Digital Video of the camera head that carries these zoom lens.Figure 33 represents the outward appearance of this Digital Video 10 of seeing from the front side, and Figure 34 represents the outward appearance of this Digital Video 10 of seeing from rear side.This Digital Video 10 possesses the flash light emission portion 21 of illumination flash in the central upper of this front face side.And, be provided with photography aperture 22 in the side portion of the flash light emission portion 21 of this front face side from the light incident of photography target.This Digital Video 10 side in the above also possesses release-push 23 and power knob 24.This Digital Video 10 side overleaf also possesses display part 25 and operating portion 26,27.Display part 25 is used to show the image that is taken.In this Digital Video 10, carry out the photography of the static figure of 1 frame part by pressing operation release-push 23, be recorded in the storage card (not shown) that is loaded into Digital Video 10 by this photography acquired image data.
The static video camera 10 of this number possesses imaging lens system 1 in framework inside.The related zoom lens of present embodiment have been used as this imaging lens system 1.The lens (negative meniscus lens L11) that imaging lens system 1 is configured to the most close thing side are positioned at the photography aperture 22 that is located at front face side.Imaging lens system 1 is according to the inside that is assembled in Digital Video 10 by the mode integral body consistent with the longitudinal direction of video camera body of the optical axis Z1 after the right-angle prism LP bending along longitudinal direction.And, also can be used as and whole be assembled in the inside of Digital Video 10 along transverse direction, make the optical axis Z1 after the bending become the transverse direction of video camera body.
In addition, the related zoom lens of present embodiment are not limited to Digital Video, also can be equipped on various information equipments (PDA etc.) or video camera with camera function.
Then, illustrate as the effect and the effect of the zoom lens of above formation.
In these zoom lens, make structure by the bending optical system that is configured in the reflection part bending light path in the 1st lens combination G1, thereby while keeping the length that the good optical performance suppresses the thickness direction of optical system, the slimming transfiguration of the depth direction when being assembled in camera head is easy.And, by the 1st lens combination G1 to the 4 lens combination G4 all the group in suitably dispose resin lens, thereby seek cost degradation easily while keep the good optical performance.Especially, refracting power about the resin lens in each group, by the proper conditions formula (1) as a whole of a plurality of resin lens in the 1st lens combination G1 to the 4 lens combination G4, thereby a plurality of resin lens in the 1st lens combination G1 to the 4 lens combination G4 are mutually compensation temperature ground work as a whole, utilizes a plurality of resin lens to seek cost degradation and suppress flutter according to temperature variation well.And, in each lens combination, use non-spherical lens as required, proofread and correct thereby help image planes.At this moment, by non-spherical lens is made as resin lens, thereby compare easy manufacturing, can seek high performance and can seek cost degradation with glass aspheric lenses.
And the negative lens L21 that will be made of the resin material of the most close thing side in the 2nd lens combination G2 is made as the concave-concave shape, can proofread and correct curvature of the image well.And, be made as the meniscus shaped lens L43 of convex surface by the non-spherical lens that constitutes by resin material towards the thing side with the most close image planes side in the 4th lens combination G4, can proofread and correct curvature of the image etc. well.
The absolute value of the refracting power sum of the resin lens in each group of conditional (1) expression the 1st lens combination G1 to the 4 lens combination G4.Herein, in conditional (1), P1～P4 is illustrated in the focal length of respectively organizing the shortest lens of interior resin lens mid-focal length absolute value of the 1st lens combination G1 to the 4 lens combination G4.Thereby conditional (1) becomes the refracting power sum of the resin lens with strong refraction in each group.Be made as the scope of conditional (1) by the value of total with the refracting power of the resin lens in each group with strong refraction, and the compensation temperature ground work mutually as a whole of a plurality of resin lens in the 1st lens combination G1 to the 4 lens combination G4 suppresses the flutter according to temperature variation well.If deviate from the scope of conditional (1), then the temperature characterisitic deterioration.
In addition, for example,, represent preferably that then the value of total of the refracting power of the resin lens in each group of conditional (1) is positive value if also consider the temperature characterisitic of lens barrel.Thus, also comprise lens barrel, a plurality of resin lens are compensation temperature ground work mutually as a whole, can suppress the flutter according to temperature variation more well.
The focal distance f 2 of conditional (2) expression the 2nd lens combination G2 and at the absolute value of the ratio of the focal distance f w of wide-angle side.If be lower than the lower limit of conditional (2), then the focal power of the 2nd lens combination G2 becomes big, and it is too high that error-sensitivity becomes, so undesirable.And if surpass the upper limit, then the amount of movement of the 2nd lens combination G2 becomes excessive when becoming times, and lens combination increases, so undesirable.
Zoom lens as described above, related according to present embodiment, and keep small-sized and the good optical performance, and meanwhile resin lens suitably used in each group, thus can realize further seeking the varifocal optical system of cost degradation.
[embodiment]
Then, the concrete numerical value embodiment to the related zoom lens of present embodiment describes.A plurality of numerical value embodiment describe in following summary.
Fig. 7 (A), (B) and Fig. 8 represent the concrete lens data corresponding to the structure of the zoom lens shown in Fig. 1 (A), (B).Especially represent the lens data that it is basic at Fig. 7 (A), represent other data at Fig. 7 (B) and Fig. 8.The zoom lens related to embodiment 1 are represented on the hurdle of face number Si in the lens data shown in Fig. 7 (A), with the face of the textural element of the most close thing side is the 1st, according to the number that increases i (i=1～22) face enclosing symbol towards the image planes side successively.Represent on the hurdle of radius of curvature R i corresponding at the symbol Ri that Fig. 1 enclosed, from the value (mm) of the radius-of-curvature of i face of thing side.Represent interval (mm) from the optical axis of i face Si of thing side and i+1 face Si+1 too for the hurdle of face interval D i.Represent value to the refractive index of d line (587.6nm) from j optical parameter of thing side on the Ndj hurdle.Represent value to the Abbe number of d line from j optical parameter of thing side on the vdj hurdle.Also be illustrated in the paraxial focal distance f (mm) of total system of wide-angle side and telescope end and the value of F number (FNO.) as various aberrations at Fig. 7 (A).
The lens L31 of zoom lens lens L21, the 3rd lens combination G3 of the most close lens L13 as side, the most close thing side in the 2nd lens combination G2 in the 1st lens G1 that embodiment 1 is related, the most close lens L43 as side becomes resin lens in the 4th lens combination G4.
In the lens data of Fig. 7 (A), the mark of enclosing in the left side of face number [*] represents that this lens face is an aspherical shape.Two sides S14, the S15 of the lens L31 of two sides S7, the S8 of lens L13 in the zoom lens that implementation column 1 is related, the 1st lens combination G1, two sides S9, the S10 of the lens L21 in the 2nd lens combination G2, the 3rd lens combination G3, two sides S20, the S21 of the lens L43 in the 4th lens combination G4 all become aspherical shape.The basic lens data of Fig. 7 (A) as these aspheric radius-of-curvature represent to have near the numerical value of the radius-of-curvature the optical axis.
Represent aspherical surface data in the related zoom lens of embodiment 1 at Fig. 8.In as the numerical value shown in the aspherical surface data, mark " E " represents that the numerical value after it is the end " power exponent " with 10, and expression is by being that the numerical value that the exponential function at the end is represented multiplies each other with " E " numerical value before with 10.For example, if " 1.0E-02 ", then expression " 1.0 * 10
-2".
As the aspherical surface data of the related zoom lens of embodiment 1, write down by value with each coefficient An, KA in the formula of the represented aspherical shape of following formula (A).Detailed it, Z represents from being positioned at the length of perpendicular (mm) that point on the aspheric surface of the position of optical axis height h hangs down into the section (perpendicular to the plane of optical axis) on aspheric surface summit.
Z＝C·h
2/{1+(1-KA·C
2·h
2)
1/2}+∑A
n·h
n……(A)
(integer that n=3 is above)
Herein,
Z: the aspheric degree of depth (mm)
H: the distance from the optical axis to the lens face (highly) (mm)
KA: heart rate far away
C: paraxial curvature=1/R
(R: paraxial radius-of-curvature)
A
n: the n time asphericity coefficient
The zoom lens that embodiment 1 is related are as asphericity coefficient A
nSuitably use A effectively
3～A
16Till number of times represent.
As the related zoom lens of above embodiment 1, will be illustrated in Fig. 9 (A), (B) and Figure 10 as embodiment 2 corresponding to the concrete lens data of the structure of the zoom lens shown in Fig. 2 (A), (B).And, will be illustrated in Figure 11 (A), (B) and Figure 12 as embodiment 3 corresponding to the concrete lens data of the structure of the zoom lens shown in Fig. 3 (A), (B) equally.And, similarly will be illustrated in Figure 13 (A), (B) and Figure 14 as embodiment 4 corresponding to the concrete lens data of the structure of the zoom lens shown in Fig. 4 (A), (B).And, will be illustrated in Figure 15 (A), (B) and Figure 16 as embodiment 5 corresponding to the concrete lens data of the structure of the zoom lens shown in Fig. 5 (A), (B) equally.And, will be illustrated in Figure 17 (A), (B) and Figure 18 as embodiment 6 corresponding to the concrete lens data of the structure of the zoom lens shown in Fig. 6 (A), (B) equally.
In addition, for any zoom lens of embodiment 2 to 6, the face same with the related zoom lens of embodiment 1 also becomes aspherical shape.For any zoom lens of embodiment 2 to 6 also as the related zoom lens of embodiment 1, in the 1st lens combination G1 the most close lens L13 as side, in the 2nd lens combination G2 lens L21, the 3rd lens combination G3 of the most close thing side lens L31, the most close lens L43 as side becomes resin lens in the 4th lens combination G4.
The value of representing each embodiment is summed up relevant above-mentioned each conditional at Figure 19.As shown in Figure 19, the value to conditional (1), (2) each embodiment becomes in its numerical range.
Figure 20 (A)～(C) represents the spherical aberration in wide-angle side, astigmatism and the distortion (distortion aberration) in the related zoom lens of embodiment 1 respectively.Figure 21 (A)～(C) is illustrated in each same aberration of telescope end.Represent that at each aberration diagram with d line (587.6nm) be the aberration of reference wavelength.Represent aberration at spherical aberration diagram to g line (wavelength 435.8nm), C line (wavelength 656.3nm).In astigmatism figure, solid line is represented sagitta of arc direction, and dotted line is represented the aberration of meridian direction.FNO. represent the F value, ω represents angle of half field-of view.
Similarly, will be illustrated in Figure 22 (A)～(C) (wide-angle side) and Figure 23 (A)～(C) (telescope end) to the various aberrations of the related zoom lens of embodiment 2.Similarly, to be illustrated in Figure 24 (A)～(C) (wide-angle side) and Figure 25 (A)～(C) (telescope end) to the various aberrations of the related zoom lens of embodiment 3, to be illustrated in Figure 26 (A)～(C) (wide-angle side) and Figure 27 (A)～(C) (telescope end) to the various aberrations of the related zoom lens of embodiment 4, to be illustrated in Figure 28 (A)～(C) (wide-angle side) and Figure 29 (A)～(C) (telescope end) to the various aberrations of the related zoom lens of embodiment 5, will be illustrated in Figure 30 (A)～(C) (wide-angle side) and Figure 31 (A)～(C) (telescope end) the various aberrations of the related zoom lens of embodiment 6.
From above each numeric data and each aberration diagram as can be known, each embodiment is proofreaied and correct various aberrations well, by keeping small-sized and the good optical performance, and can be by suitably having the zoom lens that resin lens realizes further seeking cost degradation in each group.
In addition, the invention is not restricted to above-mentioned embodiment and each embodiment, can carry out various distortion and implement.For example, the radius-of-curvature of each lens composition, face at interval and the value of refractive index etc. be not limited in the value shown in above-mentioned each numerical value embodiment desirable other values.
And the invention is not restricted to integral body is 4 groups of zoom lens that constitute, also applicable to the zoom lens that possess the lens combination more than 5 groups.
Claims (6)
1. zoom lens is characterized in that,
At least possess the 1st lens combination, the 2nd lens combination, the 3rd lens combination successively, reach the 4th lens combination from the thing side, become doubly by changing above-mentioned the 1st lens combination to respectively organizing at interval of above-mentioned the 4th lens combination,
Above-mentioned the 1st lens combination has positive focal power as a whole, and has the reflection part of negative meniscus lens, bending light path successively, is made as the aspheric positive lens that is made of resin material to major general's 1 face from the thing side,
Above-mentioned the 2nd lens combination has negative focal power as a whole, and has the negative lens that is made of resin material in the most close thing side,
Above-mentioned the 3rd lens combination is made of the positive lens that is made as aspheric resin material to major general's 1 face,
Above-mentioned the 4th lens combination has positive focal power as a whole, and has the non-spherical lens that at least 1 face is made as aspheric resin material in the most close image planes side,
And, constitute the formula of meeting the following conditions:
|1/P1+1/P2+1/P3+1/P4|＜0.1……(1)
Herein,
P1: the shortest focal length of lens of lens mid-focal length absolute value that constitutes by resin material in the 1st lens combination, its unit is mm;
P2: the shortest focal length of lens of lens mid-focal length absolute value that constitutes by resin material in the 2nd lens combination, its unit is mm;
P3: the shortest focal length of lens of lens mid-focal length absolute value that constitutes by resin material in the 3rd lens combination, its unit is mm;
P4: the shortest focal length of lens of lens mid-focal length absolute value that is made of resin material in the 4th lens combination, its unit is mm.
2. zoom lens as claimed in claim 1 is characterized in that,
And formula meets the following conditions:
0.8＜|f2/fw|＜1.2……(2)
Herein,
Fw: at the focal length of the total system of wide-angle side
F2: the focal length of the 2nd lens combination.
3. zoom lens as claimed in claim 1 is characterized in that,
The above-mentioned negative lens of the most close thing side in above-mentioned the 2nd lens combination is a biconcave lens.
4. zoom lens as claimed in claim 2 is characterized in that,
The above-mentioned negative lens of the most close thing side in above-mentioned the 2nd lens combination is a biconcave lens.
5. as each the described zoom lens in the claim 1 to 4, it is characterized in that,
The above-mentioned non-spherical lens of the most close image planes side in above-mentioned the 4th lens combination is with the meniscus shape of convex surface towards the thing side.
6. camera head is characterized in that possessing:
The described zoom lens of in the claim 1 to 5 each; With
The imaging apparatus of the image pickup signal that output is corresponding with the optical image that forms by above-mentioned zoom lens.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008234583A JP5069651B2 (en) | 2008-09-12 | 2008-09-12 | Zoom lens and imaging device |
| JP2008234583 | 2008-09-12 | ||
| JP2008-234583 | 2008-09-12 |
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| Publication Number | Publication Date |
|---|---|
| CN101672976A CN101672976A (en) | 2010-03-17 |
| CN101672976B true CN101672976B (en) | 2011-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009101655071A Expired - Fee Related CN101672976B (en) | 2008-09-12 | 2009-07-29 | A zoom lens and camera device |
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| Country | Link |
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| JP (1) | JP5069651B2 (en) |
| CN (1) | CN101672976B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5671062A (en) * | 1991-05-21 | 1997-09-23 | Sony Corporation | Zoom lens having a light weight and temperature independent fourth lens group |
| CN101153955A (en) * | 2006-09-26 | 2008-04-02 | 富士能株式会社 | Projecting zoom lens and projection display device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4717480B2 (en) * | 2005-03-25 | 2011-07-06 | 富士フイルム株式会社 | Zoom lens |
| JP5084283B2 (en) * | 2007-02-02 | 2012-11-28 | オリンパス株式会社 | Imaging optical system and electronic imaging apparatus having the same |
-
2008
- 2008-09-12 JP JP2008234583A patent/JP5069651B2/en not_active Expired - Fee Related
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2009
- 2009-07-29 CN CN2009101655071A patent/CN101672976B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5671062A (en) * | 1991-05-21 | 1997-09-23 | Sony Corporation | Zoom lens having a light weight and temperature independent fourth lens group |
| CN101153955A (en) * | 2006-09-26 | 2008-04-02 | 富士能株式会社 | Projecting zoom lens and projection display device |
Non-Patent Citations (2)
| Title |
|---|
| JP昭58-215638A 1983.12.15 |
| JP特开2006-145744A 2006.06.08 |
Also Published As
| Publication number | Publication date |
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| JP5069651B2 (en) | 2012-11-07 |
| CN101672976A (en) | 2010-03-17 |
| JP2010066658A (en) | 2010-03-25 |
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