CN201716463U - Zoom lens and camera device - Google Patents
Zoom lens and camera device Download PDFInfo
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- CN201716463U CN201716463U CN2010201779369U CN201020177936U CN201716463U CN 201716463 U CN201716463 U CN 201716463U CN 2010201779369 U CN2010201779369 U CN 2010201779369U CN 201020177936 U CN201020177936 U CN 201020177936U CN 201716463 U CN201716463 U CN 201716463U
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Abstract
The utility model provides a zoom lens and a camera device which can not only suppress the aberration performance deterioration, but also be particularly applicable to realizing miniaturization of portable terminals and the like. The zoom lens is sequentially equipped with a first lens group with negative refractive power, a second lens group with positive refractive power, a third lens group with the negative refractive power and a fourth lens group with the positive refractive power from the object side. Furthermore, lenses contained in the first lens group and the third lens group are only set to be the lenses with the negative refractive power, and the lenses contained in the second lens group and the fourth lens group are only set to be the lenses with the positive refractive power. Each lens group consists of no more than two lenses. When the Abbe number of the lens which is configured to be closest to the object side and has the negative refractive power in the first lens group to the d line is set to be vd1, and the Abbe number of at least one lens with the positive refractive power in the second lens group to the d line is set to be vd2, the vd1 and the vd2 meet the following conditional expression: vd1 is more than 50 (1) and vd2 is more than 58 (2).
Description
Technical field
The present invention relates to the zoom lens and the camera head that in video camera, digital static video camera and information portable terminal device (PDA:Personal Digital Assistance) etc., are suitable for.
Background technology
In recent years, in the camera head of static video camera of numeral etc., development along with the miniaturization of the imaging apparatus of CCD (ChargeCoupled Device) or CMOS (Complementary Metal OxideSemiconductor) etc. requires the miniaturization as device integral body.On the one hand, as the small-sized zoom-lens system that is suitable for most digital static video camera or mobile communication terminal, in the past, known have lens combination be provided with right-angle prism etc. reflection part and with light path halfway with the zoom lens right angle bending, so-called bending-type (with reference to patent documentation 1 to 4).As the bending-type zoom lens of the type that helps miniaturization or wide-angleization, the negative neck type (マ イ Na ス リ one De タ イ プ) of the known what is called that has the 1st lens combination to have negative refraction power.For example in the patent documentation 1 to 3, disclose from the thing side and dispose negative, positive, negative, positive lens combination successively and make the 2nd lens combination and the 3rd lens combination moves the bending-type zoom lens that become structure doubly.
Patent documentation 1: the open 2006-330349 communique of Jap.P.
Patent documentation 2: the open 2006-284790 communique of Jap.P.
Patent documentation 3: the open 2007-86307 communique of Jap.P.
Patent documentation 4: the open 2004-295075 communique of Jap.P.
Yet, especially under the situation of pressing portable terminal device purposes employing bending-type zoom lens, not only require thinness, and require whole smaller volume as lens subassembly.In patent documentation 1 to 3 described zoom lens, viewpoint from slimming, carried out concentrated studying intensively to the external diameter of the 1st lens or as the prism miniaturization of reflection part, but length for the optical axis direction after the bending, the understanding that is made the unit that carried in the static video camera of numeral etc. seek sufficient miniaturization by light path bending is arranged, and for the balance of seeking optical property or specification, cost etc. necessary above shortening be not carried out.But, need further miniaturization when in the portable telephone of band camera, adopting.
As the simplest structure that can expect, can think the structure that each lens combination only is made of 1 lens.At this moment, with in the past since in the static video camera of numeral etc. the zoom lens of employed bending-type compare and the lens number is few, but, can access the good optical performance by according to the effective utilization of non-spherical lens or the selection of the employed material of lens.As each lens combination when constituting by 1 lens, need the focal power of each lens combination to bear, thereby must use the multi-disc glass mold by 1 lens.This structure is suitable under the situation of the specification of override size, but cost uprises, so according to desired specification, performance, cost, just be necessary to take suitable, preferred structure.For example, for seeking cost degradation, the structure of using plastic lens is effectively, but the variation of the characteristic that plastics Yin Wendu causes is big, so can't have strong focal power.
So, in each lens combination, make 1 lens be distributed to 2 lens of prosign (plus or minus), the structure that per 1 focal power is reduced is effective thus.And, if miniaturization and 1 lens has very much focal power, then the curvature of lens becomes big, aberration change when becoming times becomes big or can improve the susceptibility of the performance degradation of foozle, thereby the difficulty of making improves, so not preferred, in this sense, can think that also the structure that 1 lens is distributed to the lens of 2 phase one symbols is effective.In any case, if each lens combination only is made of the lens of monadic symbols, then can strengthen the focal power of each lens combination, thus can think the amount of movement of the thickness of lens combination or lens combination, rear cut-off distance (back focus) etc. are dwindled, thus can be with the lens combination miniaturization.
Yet, in bending-type zoom lens in the past, almost do not have as the above-mentioned example that only constitutes each lens combination, because the lens number is many, so always grow up by the lens of monadic symbols.As patent documentation 4, the example that also has each lens combination to constitute by 1 lens, but it is little of about 2 times to become multiple proportions.And, in the zoom lens that patent documentation 4 is put down in writing, making prism have refracting power, but be difficult to process this prism as reflection part, the problem time-consuming at manufacture view exists.
Summary of the invention
The present invention finishes in view of this problem points, and its purpose is, provides a kind of and not only suppresses the deterioration of aberration performance and be suitable for zoom lens and the camera head that the miniaturization of portable terminal device etc. is achieved especially most.
According to zoom lens of the present invention, constitute, and become doubly by the 1st lens combination with negative refracting power, the 2nd lens combination, the 3rd lens combination, the 4th lens combination with positive refracting power successively from the thing side by the interval variation on the optical axis that makes each lens combination with negative refracting power with positive refracting power.And, the 1st lens combination has the reflection part that makes the light path bending by the reflection incident light, the lens that comprised in the 1st lens combination and the 3rd lens combination only have the lens of negative refracting power, the lens that comprised in the 2nd lens combination and the 4th lens combination only have the lens of positive refracting power, and each lens combination is made of the lens below 2.And, the lens with negative refracting power that disposed by the thing side that will be in the 1st lens combination are made as v d1 to the Abbe number of d line, when will be in the 2nd lens combination at least 1 lens with positive refracting power are made as v d2 to the Abbe number of d line, satisfy following conditional.
v?d1＞50……(1)
v?d2＞58……(2)
In zoom lens of the present invention, make the optical system of the bending-type of light path bending by adopting by the reflection part that in the 1st lens combination, is disposed, thus not only keep the good optical performance and suppress optical system thickness direction length and make the slimming when being assembled into camera head become easy.And setting refracting power successively from the thing side is 4 negative, positive, negative, positive lens combination, makes interval variation on the optical axis of each lens combination become the zoom lens of 4 prescription formulas doubly by employing, easy thereby the shorteningization of length overall becomes.And by each lens combination is constituted the optimization of the structure of seeking each lens combination by the lens of the monadic symbols below 2 (plus or minus), thereby the deterioration and the miniaturization that not only suppress the aberration performance become easy.
And, also by further suitably adopt and satisfy below preferred construction, keep optical property well, and become and seek further miniaturization easily as lens integral body.
In zoom lens of the present invention, when at least 1 in the 3rd lens combination lens with negative refracting power are made as v d3 to the Abbe number of d line, preferably satisfy following conditional.
16＜v?d3＜32……(3)
And, the focal length of the 1st lens combination is made as f1, in the time of will being made as fw at the focal length of the total system of wide-angle side, preferably satisfies following conditional.
1.4＜|f1/fw|＜2.5……(4)
And, the focal length of the 2nd lens combination is made as f2, in the time of will being made as fw at the focal length of the total system of wide-angle side, preferably satisfies following conditional.
0.7＜f2/fw＜1.6……(5)
And, when the constituent material of the reflection part in the 1st lens combination is made as Nd1p to the refractive index of d line, preferably satisfy following conditional.
Nd1p＞1.78……(6)
The 2nd lens combination only is made of 2 lens with positive refracting power also can.The 4th lens combination only is made of 1 lens with positive refracting power also can.
The 1st lens combination is made of the 1st negative lens (also weighing-appliance has the lens of negative refraction power), reflection part, the 2nd lens with negative refraction power successively from the thing side also can.Perhaps, the 1st lens combination is made of 1 lens, reflection part with negative refracting power successively from the thing side and also can.
And diaphragm is configured between the 2nd lens combination and the 3rd lens combination also can.At this moment, when becoming times, diaphragm can move with the 3rd lens combination one.
The 4th lens combination is fixed when becoming times and also can.And, also can by making the 3rd lens combination or the 4th lens combination on optical axis, move to focus.
Camera head of the present invention possesses: zoom lens of the present invention and the imaging apparatus that the pairing image pickup signal of optical image that these zoom lens form is exported.
In camera head of the present invention, the high performance zoom lens of seeking miniaturization of the present invention are used as imaging lens system, and can be sought miniaturization as device integral body.
According to zoom lens of the present invention, basic structure is made as the structure of 4 groups of zooms of the bending-type that helps miniaturization, and, each lens combination is sought the optimization of the structure of each lens combination by the lens formation of the monadic symbols below 2 (plus or minus), so can not only suppress the deterioration of aberration performance, and seek especially to be fit to the miniaturization of portable terminal device etc.
And, according to camera head of the present invention, the high performance zoom lens of seeking miniaturization of the invention described above are used as imaging lens system, thus the shooting performance that suppresses good can not only be kept, and seek miniaturization as device integral body.
Description of drawings
Fig. 1 is the 1st structure example of the related zoom lens of expression one embodiment of the present invention, and is the lens profile figure corresponding to embodiment 1.
Fig. 2 is the 2nd structure example of the related zoom lens of expression one embodiment of the present invention, and is the lens profile figure corresponding to embodiment 2.
Fig. 3 is the 3rd structure example of the related zoom lens of expression one embodiment of the present invention, and is the lens profile figure corresponding to embodiment 3.
Fig. 4 is the 4th structure example of the related zoom lens of expression one embodiment of the present invention, and is the lens profile figure corresponding to embodiment 4.
Fig. 5 is the 5th structure example of the related zoom lens of expression one embodiment of the present invention, and is the lens profile figure corresponding to embodiment 5.
Fig. 6 is the 6th structure example of the related zoom lens of expression one embodiment of the present invention, and is the lens profile figure corresponding to embodiment 6.
Fig. 7 is the 7th structure example of the related zoom lens of expression one embodiment of the present invention, and is the lens profile figure corresponding to embodiment 7.
Fig. 8 is the expression lens profile figure of zoom lens under the state of light path bending shown in Figure 1.
Fig. 9 is the aberration diagram at the various aberrations of wide-angle side of the related zoom lens of expression embodiment 1, (A) expression spherical aberration, (B) expression astigmatism, (C) expression distortion, (D) expression multiplying power aberration.
Figure 10 is the aberration diagram at the various aberrations of telescope end of the related zoom lens of expression embodiment 1, (A) expression spherical aberration, (B) expression astigmatism, (C) expression distortion, (D) expression multiplying power aberration.
Figure 11 is the aberration diagram at the various aberrations of wide-angle side of the related zoom lens of expression embodiment 2, (A) expression spherical aberration, (B) expression astigmatism, (C) expression distortion, (D) expression multiplying power aberration.
Figure 12 is the aberration diagram at the various aberrations of telescope end of the related zoom lens of expression embodiment 2, (A) expression spherical aberration, (B) expression astigmatism, (C) expression distortion, (D) expression multiplying power aberration.
Figure 13 is the aberration diagram at the various aberrations of wide-angle side of the related zoom lens of expression embodiment 3, (A) expression spherical aberration, (B) expression astigmatism, (C) expression distortion, (D) expression multiplying power aberration.
Figure 14 is the aberration diagram at the various aberrations of telescope end of the related zoom lens of expression embodiment 3, (A) expression spherical aberration, (B) expression astigmatism, (C) expression distortion, (D) expression multiplying power aberration.
Figure 15 is the aberration diagram at the various aberrations of wide-angle side of the related zoom lens of expression embodiment 4, (A) expression spherical aberration, (B) expression astigmatism, (C) expression distortion, (D) expression multiplying power aberration.
Figure 16 is the aberration diagram at the various aberrations of telescope end of the related zoom lens of expression embodiment 4, (A) expression spherical aberration, (B) expression astigmatism, (C) expression distortion, (D) expression multiplying power aberration.
Figure 17 is the aberration diagram at the various aberrations of wide-angle side of the related zoom lens of expression embodiment 5, (A) expression spherical aberration, (B) expression astigmatism, (C) expression distortion, (D) expression multiplying power aberration.
Figure 18 is the aberration diagram at the various aberrations of telescope end of the related zoom lens of expression embodiment 5, (A) expression spherical aberration, (B) expression astigmatism, (C) expression distortion, (D) expression multiplying power aberration.
Figure 19 is the aberration diagram at the various aberrations of wide-angle side of the related zoom lens of expression embodiment 6, (A) expression spherical aberration, (B) expression astigmatism, (C) expression distortion, (D) expression multiplying power aberration.
Figure 20 is the aberration diagram at the various aberrations of telescope end of the related zoom lens of expression embodiment 6, (A) expression spherical aberration, (B) expression astigmatism, (C) expression distortion, (D) expression multiplying power aberration.
Figure 21 is the aberration diagram at the various aberrations of wide-angle side of the related zoom lens of expression embodiment 7, (A) expression spherical aberration, (B) expression astigmatism, (C) expression distortion, (D) expression multiplying power aberration.
Figure 22 is the aberration diagram at the various aberrations of telescope end of the related zoom lens of expression embodiment 7, (A) expression spherical aberration, (B) expression astigmatism, (C) expression distortion, (D) expression multiplying power aberration.
Figure 23 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 24 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: face interval, Z1-optical axis, the 100-imaging apparatus of 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 (reflection part), St-aperture diaphragm, Ri-i and i+1 's lens face from the radius-of-curvature of i lens face of thing side, Di-from the thing side.
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 lens arrangement of the 1st numerical value embodiment described later.In addition, Fig. 1 (A) with under the focusing state of infinite distance and, Fig. 1 (B) corresponding in the optical system configurations of wide-angle side (shortest focal length state) with under the focusing state of infinite distance and corresponding in the optical system configurations of telescope end (longest focal length state).The cross-section structure of the 2nd to the 7th structure example that similarly, will be corresponding with the lens arrangement of the described later the 2nd to the 7th numerical value embodiment is shown in Fig. 2 (A), (B)～Fig. 7 (A), (B).In Fig. 1 (A), (B)～Fig. 7 (A), (B), symbol Ri represents to lean on most the face of the textural element of thing side to be made as the 1st and along with the radius-of-curvature that increases i the face of symbol that added towards picture side (imaging side) successively.Symbol Di is the face interval on optical axis Z1 of i face of expression and i+1 face.In addition, about symbol Di, only to the face of the part that changes interval (for example being D6, D10, D15) diacritic about the 1st structure example along with becoming doubly.
These zoom lens possess from the thing side successively along optical axis Z1: the 1st lens combination G1, the 2nd lens combination G2, the 3rd lens combination G3, the 4th lens combination G4.Optical aperture diaphragm St is configured between the 2nd lens combination G2 and the 3rd lens combination G3.
These zoom lens except the photographic equipment of for example video camera and digital static video camera etc., also can carry the information portable terminal device at PDA etc.Dispose image pickup part structure corresponding components with the video camera that carried at these zoom lens as side.For example, dispose the imaging apparatus 100 of CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) etc. at the imaging surface (shooting face) of these zoom lens.The imaging apparatus 100 outputs image pickup signal corresponding with the optical image that forms by zoom lens.At least constitute the camera head of present embodiment by these zoom lens and imaging apparatus 100.Between final lens group (the 4th lens combination G4) and imaging apparatus 100, can dispose various optics GC according to the structure of the camera side of loading lens.For example, also can dispose the plate shaped optics of shooting face protection with cover glass or infrared intercepting filter etc.
These zoom lens become doubly by the interval variation on the optical axis that makes each lens combination.For example the 2nd lens combination G2 and the 3rd lens combination G3 move on optical axis Z1 when becoming times.And, the 3rd lens combination G3 or the 4th lens combination G4 are moved when focusing.Preferred the 1st lens combination G1 is fixing all the time when becoming doubly and focusing.And preferred the 4th lens combination G4 fixes when becoming times.Aperture diaphragm St becomes for example mobile with the 3rd lens combination G3.Among Fig. 1 (A), (B)～Fig. 7 (A), (B), represent by solid arrow at the track that moves group from wide-angle side each during to the change of telescope end times.
The 1st lens combination G1 has negative refracting power as a whole.The 1st lens combination G1 have by the reflection incident light make the light path bending, as the right-angle prism LP of reflection part.The 1st lens combination G1 is made of right-angle prism LP and the negative lens below 2 (also weighing-appliance has the lens of negative refracting power).The 2nd structure example shown in Fig. 2 (A), (B) for example is made of the 1st lens L11 with negative refraction power and right-angle prism LP successively from the thing side.And also the 1st structure example shown in Fig. 1 (A), (B) for example is made of the 1st the lens L11 with negative refraction power, right-angle prism LP, the 2nd the lens L12 with negative refraction power successively from the thing side.
At this, the related zoom lens of present embodiment are bending optical systems, in fact as shown in Figure 8, in the 1st lens combination G1 by the internal reflection surface of for example right-angle prism LP with roughly 90 ° of light path bendings.In addition, though Fig. 8 is also identical to other structure example corresponding to the 1st structure example shown in Fig. 1 (A).In Fig. 1 (A), (B)～Fig. 7 (A), (B), Z1 is made as linear with optical axis, launches to same direction by the internal reflection surface that omits right-angle prism LP, is represented as the rectilinearity optical system of equivalence.In addition, also can replace right-angle prism LP and use other reflection part such as catoptron.But use right-angle prism LP can more shorten apparent optical path length as reflection part than the situation of using catoptron, thus can be with the 1st lens combination G1 miniaturization, and then can be with integral miniaturization, so preferred.And it is the plane of vertical (radius-of-curvature ∞) that the plane of incidence of preferred right-angle prism LP becomes with respect to optical axis Z1 with exit facet, and is the structure with refracting power.Can seek cost degradation thus.
The 2nd lens combination G2 has positive refracting power as a whole.The 2nd lens combination G2 only is made of the positive lens below 2 (also weighing-appliance has the lens of positive refracting power).Among Fig. 1 (A), (B)～Fig. 7 (A), (B), as the 2nd lens combination G2 represent to have the example that only constitutes by the 1st positive lens L21, and by 2 examples that constitute of the 1st positive lens L21 and the 2nd positive lens L22.
The 3rd lens combination G3 has negative refracting power as a whole.The 3rd lens combination G3 only is made of the lens with negative refracting power below 2.Among Fig. 1 (A), (B)～Fig. 7 (A), (B), be shown with the example that only constitutes as the 3rd lens combination G3 by the 1st negative lens L31, and by 2 examples that constitute of the 1st negative lens L31 and the 2nd negative lens L32.
The 4th lens combination G4 has positive refracting power as a whole.The 4th lens combination G4 only is made of the positive lens below 2 (also weighing-appliance has the lens of positive refracting power).Among Fig. 1 (A), (B)～Fig. 7 (A), (B), be shown with the example that only constitutes as the 4th lens combination G4 by the 1st positive lens L41, and by 2 examples that constitute of the 1st positive lens L41 and the 2nd positive lens L42.
These zoom lens constitute, the 1st negative lens L11 that is disposed by the thing side that will be in the 1st lens combination G1 is made as v d1, when at least 1 in the 2nd lens combination G2 lens with positive refracting power are made as v d2 to the Abbe number of d line, satisfies following conditional the Abbe number of d line.
v?d1＞50……(1)
v?d2＞58……(2)
And, when at least 1 in the 3rd lens combination G3 lens with negative refracting power are made as v d3 to the Abbe number of d line, preferably satisfy following conditional.
16＜vd3＜32……(3)
And, the focal length of the 1st lens combination G1 is made as f1, in the time of will being made as fw at the focal length of the total system of wide-angle side, preferably satisfies following conditional.
1.4＜|f1/fw|＜2.5……(4)
And, when the focal length of the 2nd lens combination G2 is made as f2, preferably satisfy following conditional.
0.7＜f2/fw＜1.6……(5)
And, when the constituent material of the reflection part in the 1st lens combination G1 (right-angle prism LP) is made as Nd1p to the refractive index of d line, preferably satisfy following conditional.
Nd1p＞1.78……(6)
In Figure 23, Figure 24,, represent digital static video camera as an example of the camera head that is equipped with these zoom lens.Especially, Figure 23 represents the outward appearance that the static video camera 10 of this numeral is seen from the front side, and Figure 24 represents the outward appearance that the static video camera 10 of this numeral is seen from rear side.The static video camera 10 of this numeral possesses the strobe light illuminating part 21 of irradiation strobe light in the central upper of its front face side.And, be provided with the shooting aperture 22 of incident in this front face side at the sidepiece of strobe light illuminating part 21 from the light of shooting object.And should the static video camera 10 of numeral in the above side possess release key 23 and power key 24.The static video camera 10 of this numeral also overleaf side possess display part 25 and operating portion 26,27.Display part 25 is used to show captured portrait.The static video camera 10 of this numeral carry out the photography of the rest image of 1 frame part, thereby the Imagery Data Recording that will obtain is being loaded into the storage card (not shown) of digital static video camera 10 by pressing operation release key 23 in this photography.
The static video camera 10 of this numeral possesses photographic lens 1 in basket inside.As this imaging lens system 1, use the related zoom lens of present embodiment.Imaging lens system 1 is configured according to the mode that makes the lens L11 that leans on the thing side most be positioned at the shooting aperture 22 that is arranged on front face side.Imaging lens system 1 is according to the mode that makes by the vertical consistency of optical axis Z1 after the right-angle prism LP bending and video camera body, in the inside of the static video camera 10 of numeral and it is vertically assembled on the whole.In addition, also can make optical axis Z1 after the bending become video camera body laterally, in the inside of the static video camera 10 of numeral and it is laterally assembled on the whole.
Then, illustrate as the effect and the effect of the zoom lens of above formation.
These zoom lens adopt the optical system that is made the bending-type of light path bending in the 1st lens combination G1 by the reflection part that is disposed, not only keep optical property well and suppress the length of the thickness direction of optical system, and make the slimming when being assembled into camera head become easy.And setting refracting power successively from the thing side is 4 negative, positive, negative, positive lens combination, makes interval variation on the optical axis of each lens combination become the zoom lens of 4 prescription formulas doubly by employing, easy thereby the shorteningization of length overall becomes.And,, not only suppress the deterioration of aberration performance thus, and miniaturization becomes easy by the optimization that each lens combination is sought each lens group structure by the lens formation of the monadic symbols below 2 (plus or minus).
In the zoom lens of the type, by doubly the change of caused FNo. is big to the change of telescope end from wide-angle side.Therefore, for the FNo. that makes at telescope end becomes bright, the FNo. that need make in advance in wide-angle side becomes bright (adding the great opening footpath).Yet, if, be difficult to carry out aberration correction and lens and become big more than necessity to institute in the FNo. of wide-angle side blast.So,, can strengthen the change of lightness by waiting, become by the mode in the different open footpath of zoom ratio and control (open regulation) according to being made as in the open footpath of wide-angle side less than the open footpath of telescope end.Carrying out this control as required also can.
Below, describe in more detail about the effect and the effect of above-mentioned conditional.
Conditional (1) is defined in the Abbe number of the 1st negative lens L11 that is disposed by the thing side in the 1st lens combination G1.If be lower than the lower limit of conditional (1), then the multiplying power chromatic aberation becomes big in the whole zone of zoom, so not preferred.
In order to obtain higher optical property, the numerical range of conditional (1) is preferably as follows.
v?d1＞52……(1’)
At least 1 Abbe number in conditional (2) regulation the 2nd lens combination G2 with lens of positive refracting power.If be lower than the lower limit of conditional (2), then be difficult in the whole zone of zoom correcting colour aberration well.
In order to obtain higher optical property, the numerical range of conditional (2) is preferably as follows.
v?d2＞60……(2’)
At least 1 Abbe number in conditional (3) regulation the 3rd lens combination G3 with lens of negative refracting power.If be lower than the lower limit of conditional (3) or surpass the upper limit, then be difficult to the balance of chromatic aberation and multiplying power chromatic aberation on the whole regional retainer shaft of zoom, so not preferred.
In order to obtain higher optical property, the numerical range of conditional (3) is preferably as follows.
18＜vd3＜29……(3’)
Conditional (4) is that the focal distance f 1 of the 1st lens combination G1 has been carried out normalized formula with the focal distance f w of the total system of wide-angle side.If be lower than the lower limit of conditional (4), then be difficult to strengthen the change multiple proportions.On the contrary, if surpass the upper limit of conditional (4), then rear cut-off distance is above elongated by necessity, thereby lens combination becomes maximization.That is, can be described as the condition that about 2.8 times change multiple proportions and miniaturization are taken into account of being used to.
In order to obtain higher optical property, the numerical range of conditional (4) is preferably as follows.
1.5＜|f1/fw|＜2.4……(4’)
Conditional (5) is that the focal distance f 2 of the 2nd lens combination G2 has been carried out normalized formula with the focal distance f w of the total system of wide-angle side.If be lower than the lower limit of conditional (5), then the curvature of the lens in the 2nd lens combination G2 becomes big, follows the aberration change that becomes doubly to become big when being difficult to carry out aberration correction, so not preferred.And, because of the susceptibility of foozle or the caused performance degradation of rigging error uprises, so not preferred.On the contrary, if surpass the upper limit of conditional (5), then the mobile quantitative change of the 2nd lens combination G2 is big, thereby lens combination becomes maximization.
In order to obtain higher optical property, the numerical range of conditional (5) is preferably as follows.
0.8＜f2/fw＜1.5……(5’)
Conditional (6) is defined in the refractive index of the reflection part (right-angle prism LP) that the 1st lens combination G1 disposed.As these zoom lens, the focal power of the 1st lens combination G1 for negative lens type in, need and will constitute by the little material of chromatic dispersion to a certain extent at the 1st negative lens L11 that is disposed by the thing side.The low material refractive index of general chromatic dispersion is low, if constitute the 1st lens combination G1 with this material, then the curvature of lens becomes greatly.At this moment, the big problem of the thickness of the lens unit after bending change can produce.Therefore, preferably adopt high-index material, the countermeasure of implementing to make the effective diameter of the 1st negative lens L11 to diminish or reflection part being diminished etc. by the material that will constitute reflection part.
In order to obtain higher optical property, the numerical range of conditional (6) is preferably as follows.
Nd1p＞1.80……(6’)
As described above, the zoom lens related according to present embodiment, basic structure is made as 4 groups of Zoom structures of the bending-type that helps miniaturization, further each lens combination is constituted the optimization of seeking each lens group structure by the lens of the monadic symbols below 2 (plus or minus), so can not only suppress the deterioration of aberration performance and seek to be particularly suited for the miniaturization of portable terminal device etc.And, according to the camera head that is equipped with the related zoom lens of present embodiment, can not only keep good shooting performance and seek miniaturization as device integral body.
[embodiment]
Then, the concrete numerical value embodiment to the related zoom lens of present embodiment describes.Following, a plurality of numerical value embodiment carried out part conclude and describe.
[numerical value embodiment 1]
The pairing concrete lens data of zoom lens structure shown in [table 1]～[table 3] presentation graphs 1 (A), (B).Especially at [table 1] its basic lens data is shown, other data is shown at [table 2] and [table 3].The hurdle of face number Si in the lens data shown in [table 1] is represented: the face of textural element that will lean on the thing side about embodiment 1 related zoom lens most is as the 1st and along with the face number towards the i that increases institute's diacritic as side successively.In the hurdle of radius of curvature R i expression corresponding with the symbol Ri that added among Fig. 1 (B), from the value (mm) of the radius-of-curvature of i face of thing side.About the hurdle of face interval D i represent similarly from i face Si of thing side and i+1 face Si+1 on optical axis interval (mm).Expression is from the value of j optical parameter of thing side to the refractive index of d line (587.6nm) in the hurdle of Ndj.Expression is from the Abbe number of j optical parameter of thing side to the d line in the hurdle of v dj.
In the related zoom lens of embodiment 1 because the 2nd lens combination G2 and the 3rd lens combination 3G move on optical axis along with becoming doubly, so these each move the face interval D 6 of the front and back of group, the value of D10, D15 changes.In [table 2], be illustrated in the value of wide-angle side and telescope end as these variable interval D 6, D10, D15 data when becoming times.The value of also representing paraxial focal distance f (mm), field angle (2 ω) and the F number (FNo.) of relevant total system at wide-angle side and telescope end at [table 2] as each data.
In the lens data of [table 1], the mark " * " that is attached to face number left side represents that its lens face is an aspherical shape.Two-sided S5, the S6 of the 2nd negative lens L12 in the 1st lens combination G1 of the zoom lens that implementation column 1 is related, two-sided S7, the S8 of the 1st positive lens L21 in the 2nd lens combination G2, two-sided S16, the S17 of the 1st negative lens L41 in two-sided S12, the S13 of the 1st negative lens L31 in the 3rd lens combination G3, the 4th lens combination G4 all become aspherical shape.In the basic lens data of [table 1], represent near the numerical value of the radius-of-curvature the optical axis as these aspheric radius-of-curvature.
Aspherical surface data at the related zoom lens of [table 3] expression embodiment 1.In 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 with 10 values that to be the numerical value represented of the exponential function at the end differ with " E " numerical value before.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, record is by with each the coefficients R A in the formula of the aspherical shape shown in the following formula (A)
i, KA value.In more detail, Z represents to have the hang down length of perpendicular (mm) in section (perpendicular to the plane of optical axis) on aspheric summit of point on the aspheric surface of position of height h from the distance optical axis.
Z＝C·h
2/{1+(1-KA·C
2·h
2)
1/2}+∑RA
i·h
i……(A)
(i=n, the integer that n:3 is above)
Wherein,
Z: the aspheric degree of depth (mm)
H: the distance from the optical axis to the lens face (highly) (mm)
KA: aspheric constants
C: paraxial curvature=1/R
(R: paraxial radius-of-curvature)
RA
i: the i time asphericity coefficient
[table 1]
(*: aspheric surface)
[table 2]
[table 3]
[numerical value embodiment 2～7]
With the related zoom lens of above embodiment 1 similarly, the pairing concrete lens data of structure of the zoom lens shown in Fig. 2 (A), (B) is shown in [table 4]～[table 6] as embodiment 2.And similarly, the pairing concrete lens data of structure of the zoom lens shown in Fig. 3 (A), (B)～Fig. 7 (A), (B) is shown in [table 7]～[table 21] as embodiment 3～7.
[table 4]
(*: aspheric surface)
[table 5]
[table 6]
[table 7]
(*: aspheric surface)
[table 8]
[table 9]
[table 10]
(*: aspheric surface)
[table 11]
[table 12]
[table 13]
(*: aspheric surface)
[table 14]
[table 15]
[table 16]
(*: aspheric surface)
[table 17]
[table 18]
[table 19]
(*: aspheric surface)
[table 20]
[table 21]
At [table 22] data after the value that above-mentioned each condition is relevant is concluded at each embodiment are shown.From [table 22] as can be known, about the satisfy condition condition of formula (1)～(6) of each embodiment.Especially, the condition of formula (2) that all satisfies condition of the 2 positive lens L21,22 in the 2nd lens combination G2 of embodiment 1,4,6.Among 2 positive lens L21,22 in the 2nd lens combination G2 of embodiment 7, the 2nd positive lens L22 condition of formula (2) that satisfies condition only.
[table 22]
[aberration diagram]
Fig. 9 (A)～(D) represents the spherical aberration in wide-angle side (also claiming spherical aberration), astigmatism (also claiming astigmatism), distortion (distortion aberration) and the multiplying power chromatic aberation (also claiming ratio chromatism) of the zoom lens that embodiment 1 is related respectively.Figure 10 (A)～(D) is illustrated in each identical aberration of telescope end.Be the aberration of reference wavelength with d line (587.6nm) shown in each aberration diagram.The aberration of in spherical aberration diagram and multiplying power aberration diagram, also representing relevant wavelength 460nm, wavelength 615nm.In astigmatism figure, solid line is represented the aberration of sagitta of arc direction, the aberration that dotted line is represented meridian direction.FNO. represent that F value, ω represent angle of half field-of view.
Each aberration of similarly that relevant embodiment 2 is related zoom lens is shown in Figure 11 (A)～(D) (wide-angle side), Figure 12 (A)～(D) (telescope end).Each aberration of similarly that relevant embodiment 3～7 is related zoom lens is shown in (A)～(D) of Figure 13～Figure 22.
From each above numeric data and each aberration diagram as can be known, about each embodiment, realized becoming each aberration of zone doubly by well-corrected and the total length of lens and sought the zoom lens of miniaturization at each.
In addition, the invention is not restricted to above-mentioned embodiment and each embodiment and can carry out various distortion enforcements.For example, the value of the radius-of-curvature of each lens composition, face interval and refractive index etc. is not limited in the value shown in above-mentioned each numerical value embodiment, can get other value.
Claims (13)
1. zoom lens is characterized in that,
Constitute by the 1st lens combination with negative refracting power, the 2nd lens combination, the 3rd lens combination, the 4th lens combination with positive refracting power successively from the thing side with negative refracting power with positive refracting power, and become doubly by the interval variation on the optical axis that makes each lens combination
Above-mentioned the 1st lens combination has the reflection part that makes the light path bending by the reflection incident light,
The lens that comprised in above-mentioned the 1st lens combination and the 3rd lens combination only are negative lenses,
The lens that comprised in above-mentioned the 2nd lens combination and the 4th lens combination only are positive lenss,
Each lens combination is made of the lens below 2, and the negative lens that is disposed by the thing side that will be in above-mentioned the 1st lens combination is made as v d1, will satisfies following conditional when at least 1 positive lens in above-mentioned the 2nd lens combination is made as v d2 to the Abbe number of d line the Abbe number of d:
v?d1＞50……(1)
v?d2＞58……(2)。
2. zoom lens as claimed in claim 1 is characterized in that,
When at least 1 negative lens in above-mentioned the 3rd lens combination is made as v d3 to the Abbe number of d line, satisfy following conditional:
16＜v?d3＜32……(3)。
3. zoom lens as claimed in claim 1 or 2 is characterized in that,
The focal length of above-mentioned the 1st lens combination is made as f1, in the time of will being made as fw at the focal length of the total system of wide-angle side, satisfies following conditional:
1.4＜|f1/fw|＜2.5……(4)。
4. zoom lens as claimed in claim 1 or 2 is characterized in that,
The focal length of above-mentioned the 2nd lens combination is made as f2, in the time of will being made as fw at the focal length of the total system of wide-angle side, satisfies following conditional:
0.7＜f2/fw＜1.6……(5)。
5. zoom lens as claimed in claim 1 or 2 is characterized in that,
When the constituent material of the reflection part in above-mentioned the 1st lens combination is made as Ndlp to the refractive index of d line, satisfy following conditional:
Ndlp＞1.78……(6)。
6. zoom lens as claimed in claim 1 or 2 is characterized in that,
Above-mentioned the 2nd lens combination only is made of 2 positive lenss.
7. zoom lens as claimed in claim 1 or 2 is characterized in that,
Above-mentioned the 4th lens combination only is made of 1 positive lens.
8. zoom lens as claimed in claim 1 or 2 is characterized in that,
Above-mentioned the 1st lens combination is made of the 1st negative lens, above-mentioned reflection part, the 2nd negative lens successively from the thing side.
9. zoom lens as claimed in claim 1 or 2 is characterized in that,
Above-mentioned the 1st lens combination is made of 1 negative lens, above-mentioned reflection part successively from the thing side.
10. zoom lens as claimed in claim 1 or 2 is characterized in that,
Diaphragm is configured between above-mentioned the 2nd lens combination and above-mentioned the 3rd lens combination.
11. zoom lens as claimed in claim 10 is characterized in that,
When becoming times, above-mentioned diaphragm and above-mentioned the 3rd lens combination one move.
12. zoom lens as claimed in claim 1 or 2 is characterized in that,
Above-mentioned the 4th lens combination is fixed when becoming times.
13. a camera head is characterized in that,
Possess:
Each described zoom lens in the claim 1～12, and
Export the imaging apparatus of the image pickup signal corresponding with the formed optical image of above-mentioned zoom lens.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009210487A JP5529475B2 (en) | 2009-09-11 | 2009-09-11 | Zoom lens and imaging device |
| JP2009-210487 | 2009-09-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201716463U true CN201716463U (en) | 2011-01-19 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201779369U Expired - Lifetime CN201716463U (en) | 2009-09-11 | 2010-04-14 | Zoom lens and camera device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP5529475B2 (en) |
| CN (1) | CN201716463U (en) |
| TW (1) | TWM388647U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103901586A (en) * | 2014-04-13 | 2014-07-02 | 浙江舜宇光学有限公司 | 3D interaction-type projection lens |
| CN105652426A (en) * | 2014-12-02 | 2016-06-08 | 富士胶片株式会社 | Zoom lens and imaging apparatus |
| CN114967083A (en) * | 2022-05-25 | 2022-08-30 | 舜宇光学(中山)有限公司 | Zoom lens |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11317495B2 (en) | 2007-10-06 | 2022-04-26 | Lynk Labs, Inc. | LED circuits and assemblies |
| JP5963040B2 (en) * | 2012-03-19 | 2016-08-03 | 株式会社リコー | Imaging lens, imaging device, and information device |
| CN105068228A (en) * | 2015-07-31 | 2015-11-18 | 瑞声声学科技(苏州)有限公司 | Miniature zooming optical system of large relative aperture |
| CN108983403B (en) * | 2017-06-01 | 2021-02-26 | 诚瑞光学(苏州)有限公司 | Zoom optical system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4499404B2 (en) * | 2003-12-12 | 2010-07-07 | オリンパス株式会社 | Variable magnification optical system and electronic apparatus using the same |
| KR100616646B1 (en) * | 2004-12-27 | 2006-08-28 | 삼성전기주식회사 | Inner Zoom Lens System |
| JP4958594B2 (en) * | 2007-03-22 | 2012-06-20 | 富士フイルム株式会社 | Antireflection film, optical element and optical system |
| JP2009122682A (en) * | 2008-11-28 | 2009-06-04 | Olympus Corp | Zoom lens and electronic imaging apparatus using the same |
-
2009
- 2009-09-11 JP JP2009210487A patent/JP5529475B2/en not_active Expired - Fee Related
-
2010
- 2010-04-14 CN CN2010201779369U patent/CN201716463U/en not_active Expired - Lifetime
- 2010-04-14 TW TW099206717U patent/TWM388647U/en not_active IP Right Cessation
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103901586A (en) * | 2014-04-13 | 2014-07-02 | 浙江舜宇光学有限公司 | 3D interaction-type projection lens |
| CN103901586B (en) * | 2014-04-13 | 2016-01-20 | 浙江舜宇光学有限公司 | 3D interactive projection camera lens |
| CN105652426A (en) * | 2014-12-02 | 2016-06-08 | 富士胶片株式会社 | Zoom lens and imaging apparatus |
| CN105652426B (en) * | 2014-12-02 | 2019-11-05 | 富士胶片株式会社 | Zoom lens and photographic device |
| CN114967083A (en) * | 2022-05-25 | 2022-08-30 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN114967083B (en) * | 2022-05-25 | 2024-03-19 | 舜宇光学(中山)有限公司 | Zoom lens |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2011059495A (en) | 2011-03-24 |
| JP5529475B2 (en) | 2014-06-25 |
| TWM388647U (en) | 2010-09-11 |
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