CN102207607A - Zoom lens - Google Patents
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- CN102207607A CN102207607A CN 201010158646 CN201010158646A CN102207607A CN 102207607 A CN102207607 A CN 102207607A CN 201010158646 CN201010158646 CN 201010158646 CN 201010158646 A CN201010158646 A CN 201010158646A CN 102207607 A CN102207607 A CN 102207607A
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Abstract
The invention discloses a zoom lens comprising a first lens group and a second lens group. The first lens group has negative refracting power, and comprises a first lens, wherein the refracting power of the first lens is negative. The second lens group has positive refracting power, and is configured between the first lens group and an image side. The second lens group comprises a second lens, a third lens, a fourth lens and a fifth lens, which are orderly arranged from an object side to the image side. The second lens, the third lens, the fourth lens and the fifth lens orderly have positive refracting power, positive refracting power, negative refracting power and positive refracting power, and the refractive index of the second lens is Nd2. The first lens group and the second lens group are suitable for moving between the object side and the image side, so that the zoom lens can be switched between a wide-angle end and a telescopic end. A numerical aperture of the zoom lens is F, and the zoom lens satisfies that the absolute value of F/Nd2 is more than 1 and less than 1.6.
Description
Technical field
The present invention is about a kind of camera lens, and particularly about a kind of zoom lens.
Background technology
Progress along with display technique, various conventional cathode ray tube (the cathode raytube that are different from, CRT) Imaing projector is researched and developed in large quantities and is promoted, and wherein these Imaing projectors for example are a projector (projector) and rear-projection display device projection arrangements (projection apparatus) such as (rearprojection display).
In general, projection arrangement is to be converted to image strip by the illuminating bundle that light engine (optical engine) provides light source, and by projection lens with the image strip projection on screen and show image.Hence one can see that, and the image quality that the projection of projection arrangement institute goes out is closely bound up with light engine and projection lens.Therefore, in market with keen competition, each manufacturer there's no one who doesn't or isn't is devoted to improve the quality of projection lens, and reduces its cost of manufacture, to promote the competitive edge of above-mentioned projection arrangement.
Disclose a kind of zoom lens of five chips among the patent announcement I307813 of Taiwan, it comprises second lens group of negative dioptric first lens group and positive diopter, wherein first lens group comprises negative dioptric spherical lens, and second lens group comprises the biconvex lens of meniscus lens, a negative dioptric biconcave lens and a positive diopter of biconvex lens, a positive diopter of a positive diopter.In addition, aperture diaphragm is between the 3rd lens and the 4th lens, and first lens group and second lens group all adopt spherical lens, and can reduce cost.In addition, Taiwan patent publication No. 200734801, United States Patent (USP) notification number 7085068 and U.S. Patent Publication No. 20070223102 all disclose a kind of zoom lens of five chips, and it comprises second lens group of negative dioptric first lens group and positive diopter.
Disclose a kind of zoom lens of five chips in the United States Patent (USP) notification number 6995925, it comprises first lens group and second lens group.First lens group comprises first lens (and one side is aspheric surface at least) and one second lens of a plastic cement.Second lens group comprises the 3rd lens (and one side is aspheric surface at least) of a plastic cement and the balsaming lens of one the 4th lens and the 5th lens composition, and the diopter of the 4th lens is for negative.
In addition, U.S. Patent Publication No. 20090034067 discloses a kind of zoom lens of five chips, and it comprises first lens group, second lens group and the 3rd lens group.And the zoom lens of a kind of five chips of exposure among the patent announcement I277765 of Taiwan, it comprises first lens group, second lens group, the 3rd lens group and the 4th lens group, and aperture diaphragm is between second lens and the 3rd lens.
Disclose a kind of zoom lens of seven chips among the patent announcement I299408 of Taiwan, it comprises negative dioptric first lens group, second lens group of positive diopter and the 3rd lens group of positive diopter, and aperture diaphragm is between first lens group and second lens group.
Summary of the invention
The invention provides a kind of zoom lens, it can effectively revise aberration, and has the advantage of the lower and preferable optical imagery quality of cost of manufacture.
Other purposes of the present invention and advantage can be further understood from the disclosed technical characterictic of the present invention.
For reaching one of above-mentioned or partly or entirely purpose or other purposes, one embodiment of the invention propose a kind of zoom lens, and it comprises one first lens group and one second lens group.First lens group has negative diopter, and comprises one first lens, and wherein the diopter of first lens is for negative.Second lens group has positive diopter, and is disposed between first lens group and the picture side.Second lens group comprises from a thing side to one second lens, one the 3rd lens, one the 4th lens and one the 5th lens arranged in regular turn as side, wherein the diopter of second lens, the 3rd lens, the 4th lens and the 5th lens in regular turn for just, positive and negative, just, and the refractive index of second lens is Nd
2First lens group and second lens group are suitable for moving between thing side and picture side, so that zoom lens switches between a wide-angle side and a telescope end.The numerical aperture of zoom lens is F, and zoom lens satisfy 1＜| F/Nd
2|＜1.6.
In one embodiment of this invention, the effective focal length of the 4th lens is f
4Effective focal length when zoom lens switches to wide-angle side is f
w, and zoom lens satisfy 0.4＜| f
4/ f
w|＜0.6.
One embodiment of the invention propose a kind of zoom lens, and it comprises one first lens group and one second lens group.First lens group has negative diopter, and comprises one first lens, and wherein the diopter of first lens is for negative.Second lens group has positive diopter, and is disposed between first lens group and the picture side.Second lens group comprises from a thing side to one second lens, one the 3rd lens, one the 4th lens and one the 5th lens arranged in regular turn as side, wherein the diopter of second lens, the 3rd lens, the 4th lens and the 5th lens in regular turn for just, positive and negative, just, and the effective focal length of the 4th lens is f
4First lens group and second lens group are suitable for moving between thing side and picture side, so that zoom lens switches between a wide-angle side and a telescope end.Effective focal length when zoom lens switches to wide-angle side is f
w, and zoom lens satisfy 0.4＜| f
4/ f
w|＜0.6.
In one embodiment of this invention, the refractive index of the 4th lens is greater than 1.7.
In one embodiment of this invention, first lens, second lens, the 3rd lens, the 4th lens and the 5th lens respectively are a spherical lens.
In one embodiment of this invention, first lens, second lens, the 3rd lens, the 4th lens and the 5th lens are a convex surface towards the meniscus of thing side, a biconvex lens, concave surface concave-convex lens, a biconcave lens and the biconvex lens towards the picture side in regular turn.
In one embodiment of this invention, first lens, second lens, the 3rd lens, the 4th lens and the 5th lens are meniscus, a biconvex lens, a biconvex lens, a biconcave lens and the biconvex lens of a convex surface towards the thing side in regular turn.
In one embodiment of this invention, zoom lens also comprises an aperture diaphragm, is disposed between the 3rd lens and the 4th lens.
In one embodiment of this invention, zoom lens also comprises an aperture diaphragm, is disposed between the 4th lens and the 5th lens.
In one embodiment of this invention, when first lens group and second lens group moved towards away from each other direction, zoom lens was switched toward wide-angle side by telescope end.
In one embodiment of this invention, when first lens group and second lens group when moving near each other direction, zoom lens is switched toward telescope end by wide-angle side.
In one embodiment of this invention, first lens group is a focusing group and a zoom group, and second lens group is a zoom group.
The embodiment of the invention has following one of them advantage, and the lens in the zoom lens of the embodiment of the invention all are to use spherical lens, therefore can make zoom lens be easy to also can reach the purpose that reduces cost simultaneously outside production and the processing.Secondly, zoom lens can use the lens (as: 5) of lesser amt and reach the purpose of zoom.Moreover zoom lens can reach effective elimination aberration, aberration, distortion and have good effects such as image quality if can satisfy its a period of time at least of aforesaid optical condition.In other words, zoom lens has the lower and better optical characteristics of cost of manufacture simultaneously concurrently.
For above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and cooperate institute's accompanying drawing to do following detailed description.
Description of drawings
The focal length that Figure 1A and Figure 1B are respectively the zoom lens of one embodiment of the invention is the synoptic diagram of wide-angle side and telescope end.
Fig. 2 A to Fig. 2 B is respectively the optical quality reference picture of the focal length of the zoom lens of Figure 1A to Figure 1B when being wide-angle side and telescope end.
The focal length that Fig. 3 A and Fig. 3 B are respectively the zoom lens of another embodiment of the present invention is the synoptic diagram of wide-angle side and telescope end.
Fig. 4 A to Fig. 4 B is respectively the optical quality reference picture of the focal length of the zoom lens of Fig. 3 A to Fig. 3 B when being wide-angle side and telescope end.
The focal length that Fig. 5 A and Fig. 5 B are respectively the zoom lens of further embodiment of this invention is the synoptic diagram of wide-angle side and telescope end.
Fig. 6 A to Fig. 6 B is respectively the optical quality reference picture of the focal length of the zoom lens of Fig. 5 A to Fig. 5 B when being wide-angle side and telescope end.
Embodiment
About aforementioned and other technology contents, characteristics and effect of the present invention, in the detailed description of a following cooperation preferred embodiment with reference to the accompanying drawings, can clearly present.The direction term of being mentioned in following examples, for example: upper and lower, left and right, front or rear etc. only are directions with reference to the accompanying drawings.Therefore, the direction term of use is to be used for illustrating not to be to be used for limiting the present invention.
The focal length that Figure 1A and Figure 1B are respectively the zoom lens of one embodiment of the invention is the synoptic diagram of wide-angle side and telescope end.Please be simultaneously with reference to Figure 1A and Figure 1B, the zoom lens 100 of present embodiment comprises one first lens group 110 and one second lens group 120.The diopter of first lens group 110 and second lens group 120 is respectively negative, positive.First lens group 110 comprises one first lens 112, and wherein the diopter of first lens 112 is for negative.Second lens group 120 has positive diopter, and is disposed between first lens group 110 and the picture side.Second lens group 120 comprises from a thing side to one second lens 122, one the 3rd lens 124, one the 4th lens 126 and one the 5th lens 128 arranged in regular turn as side, wherein the diopter of second lens 122, the 3rd lens 124, the 4th lens 126 and the 5th lens 128 in regular turn for just, positive and negative, just.In the present embodiment, the material of first lens 112, second lens 122, the 3rd lens 124, the 4th lens 126 and the 5th lens 128 can be to adopt glass or plastic cement.
In the present embodiment, first lens 112 for example are concave surfaces (surperficial S2) towards the picture side, and convex surface (surperficial S1) is towards the meniscus of thing side.Second lens 122 for example are biconvex lens.The 3rd lens 124 for example are concave surfaces (surperficial S6) towards the picture side, and convex surface (surperficial S5) is towards the concave-convex lens of thing side.The 4th lens 126 for example are biconcave lenss, and the 5th lens 128 for example are biconvex lens.Yet the present invention is as limit, and in other embodiment, above-mentioned lens also can have and are different from above-mentioned shape, decide on actual situation.Need to prove, because the 4th lens 126 provide unique negative focal length for second lens group 120, therefore the overall aberration in the time of can reducing zoom lens and carry out imaging, as longitudinal chromatic aberration (Longitudinal chromaticaberration), or the aberration that relative position produced of balance zoom lens 100 each lens when carrying out zoom simultaneously.In addition, in one embodiment, the refractive index Nd of the 4th lens 126
4Greater than 1.7, can help to revise longitudinal chromatic aberration, improve the picture of separating of zoom lens 100.In addition, therefore above-mentioned lens 112,122,124,126,128 can make zoom lens 100 be easy to also can reach the purpose that reduces cost simultaneously outside production and the processing owing to all be to adopt spherical lens (Spherical Lens).
In addition, first lens group 110 and second lens group 120 are suitable for moving between thing side and picture side, so that zoom lens 100 can switch between a wide-angle side and a telescope end, shown in Figure 1A and Figure 1B.Specifically, zoom lens 100 can be by the relative distance d 1 (being the mentioned variable spacing d1 of follow-up explanation) that changes first lens group 110 and second lens group 120, and change second lens group 120 and the relative distance (as in follow-up explanation mentioned variable spacing d2) of picture between the side, thereby the imaging focal length can adjust zoom lens 100 and switch to wide-angle side and telescope end the time.In addition, when first lens group 110 and second lens group 120 moved towards away from each other directions, zoom lens 100 was switched toward wide-angle side by telescope end, shown in Figure 1A.Otherwise, when first lens group 110 and second lens group 120 when moving near each other direction, zoom lens 100 is switched toward telescope end by wide-angle side, shown in Figure 1B.In the present embodiment, first lens group 110 for example is a focusing group and a zoom group, and second lens group 120 for example is a zoom group.In addition, zoom lens 100 is about 1.1 by the zoom ratio (Zoom Ratio) that the focal length of telescope end (Tele-end) switches to the focal length of wide-angle side (Wide-end).
Effective focal length when in the present embodiment, zoom lens 100 switches to wide-angle side is f
w, and when zoom lens 100 satisfy 0.4＜| f
4/ f
w| can make zoom lens 100 have preferable image quality, wherein f at＜0.6 o'clock
4It is the effective focal length of the 4th lens 126.Specifically, in zoom lens 100, if | f
4/ f
w|＞0.6 o'clock, the focal distance f of the 4th lens 126 then
4The effective focal length f of relative zoom lens 100
wJust can be longer, cause wide-angle side (Wide-end) or telescope end (Tele-end) corrective force deficiency so easily, and make its aberration become big and separate picture (Resolution) variation.Otherwise, if | f
4/ f
w|＜0.4 o'clock, the focal distance f of the 4th lens 126 then
4The effective focal length f of relative zoom lens 100
wJust can be shorter, meaning promptly is the refractive power grow, causes when large aperture spherical aberration (Spherical aberration) overcorrection, and the rapid increase of higher order aberratons (High-order aberration) so easily.In other words, suitably adjust the focal distance f of the 4th lens 126
4, it is dropped in a certain particular range, still can present preferable image quality in the time of can making zoom lens 100 switch to wide-angle side and telescope end, as: revise aberration.
Similarly, can present preferable optical imagery quality in wide-angle side and telescope end in order to make zoom lens 100, the also visual actual state of zoom lens 100 satisfies 1＜| F/Nd
2|＜1.6 condition, wherein F is the numerical aperture of zoom lens 100, Nd
2It is the refractive index of second lens 122.Furthermore, numerical aperture F can be the numerical aperture F of zoom lens 100 in wide-angle side
wOr zoom lens 100 is at the numerical aperture F of telescope end
t, as long as F
wWith F
tOne of them satisfy 1＜| F/Nd
2|＜1.6 conditions get final product, and are not that both need satisfy this condition simultaneously.Specifically, in zoom lens 100, if | F/Nd
2|＞1.6 o'clock, then lens institute desire obtained the just increase relatively of the required curvature (Curvature) of enough refracting powers (power), and the aberration that causes like this also can increase, and particularly is applied to wide-aperture projection lens.Otherwise, if | F/Nd
2|＜1 o'clock, then the Number value aperture F of zoom lens 100 was too little, also can cause the rapid increase of aberration, thereby can't correct aberration.In other words, if the zoom lens of present embodiment 100 can satisfy 1＜| F/Nd
2|＜1.6 condition can effectively be improved the problem of aberration, thereby have preferable optical appearance.
Supplementary notes a bit when design zoom lens 100, are not particularly limited zoom lens 100 and need satisfy above-mentioned listed condition simultaneously, but the demand of optometry image quality optionally satisfy above-mentioned listed condition.
In the present embodiment, have preferable optical quality in order to make zoom lens 100, zoom lens 100 also comprises an aperture diaphragm 130, is disposed between the 3rd lens 124 and the 4th lens 126, shown in Figure 1A and Figure 1B.Specifically, by above-mentioned aperture diaphragm 130, except the beam limit of desire imaging being size arbitrarily, also can filter the parasitic light of imaging beam periphery, therefore the use by aperture diaphragm 130 can be adjusted to the picture light quantity, and scalable images in the depth of focus and the depth of field (depth of field) on the imaging surface P1, and can have preferable optical appearance.
Following content will be enumerated an embodiment of zoom lens 100.Be noted that, listed data information is not in order to limit the present invention in the following table one, any those skilled in the art when using principle of the present invention its parameter or setting are done suitable change, but it must belong in the category of the present invention after reference the present invention.
(table)
In Table 1, radius-of-curvature is meant the radius-of-curvature that each is surperficial, and spacing is meant the air line distance on optical axis A between two adjacent surfaces.For instance, the spacing of surperficial S1, promptly surperficial S1 is to the air line distance on optical axis A between surperficial S2.The pairing thickness of each lens, refractive index and Abbe number please refer to each spacing in the same column, refractive index and Abbe number value corresponding in the remarks column.In addition, in Table 1, S1, S2 are two surfaces of first lens 112 on the surface, S3, S4 are two surfaces of second lens 122 on the surface, surface S5, S6 are two surfaces of the 3rd lens 124, and surperficial S7 is an aperture diaphragm 120, and surperficial S8, S9 are two surfaces of the 4th lens 126, surface S10, S11 are two surfaces of the 5th lens 128, and surperficial S12 is the surface of a glass cover (cover glass) 70.
(table two)
Some important parameter values when the focal length of listing zoom lens 100 in table two respectively is wide-angle side and telescope end, comprise effective focal length (effective focal length, EFL), F numerical value and variable spacing d1, d2.
(table three)
| Length overall L (mm) | 90 |
| Effective focal length f w(mm) | 21.81 |
| Effective focal length f 4(mm) | -12.618 |
| |f 4/f w| | 0.579 |
| F w/Nd 2 | 1.516 |
| F t/Nd 2 | 1.579 |
In addition, some the important parameter values the when focal length of then listing zoom lens 100 in table three switches to wide-angle side and telescope end, it comprises the overall length L of zoom lens 100, the effective focal length f of zoom lens 100
w, the 4th lens 126 effective focal length f
4, f
4/ f
wAbsolute value and F
w/ Nd
2With F
t/ Nd
2Numerical value.
Fig. 2 A to Fig. 2 B is respectively the optical quality reference picture of the focal length of the zoom lens of Figure 1A to Figure 1B when being wide-angle side and telescope end.Can learn in the curve of the longitudinal spherical aberration (longitudinal spherical aberration) that is presented by Fig. 2 A and Fig. 2 B, the astigmatism curvature of field (astigmatic fieldcurves), distortion (distortion) and lateral chromatic aberration (lateral color), the shown figure that goes out of zoom lens 100 is all in the scope of standard, so the focal length of zoom lens 100 all has good image quality when being wide-angle side and telescope end.
The focal length that Fig. 3 A and Fig. 3 B are respectively the zoom lens of another embodiment of the present invention is the synoptic diagram of wide-angle side and telescope end.Please be simultaneously with reference to Figure 1A, Figure 1B, Fig. 3 A and Fig. 3 B, the zoom lens 200 of present embodiment is similar to zoom lens 100, and only topmost between the two difference is that the 3rd lens 224 in the zoom lens 200 are a biconvex lens.In the present embodiment, first lens 212 for example are concave surfaces (surperficial S2) towards the picture side, and convex surface (surperficial S1) is towards the meniscus of thing side.Second lens 222 for example are biconvex lens.The 4th lens 226 for example are biconcave lenss, and the 5th lens 228 for example are biconvex lens.Yet the present invention is as limit, and in other embodiment, above-mentioned lens also can have and are different from above-mentioned shape, decide on actual situation.Similarly, because the 4th lens 226 provide unique negative focal length for second lens group 220, therefore the overall aberration in the time of can reducing zoom lens 200 and carry out imaging, as longitudinal chromatic aberration (Longitudinal chromatic aberration), or the aberration that relative position produced of balance zoom lens 200 each lens when carrying out zoom simultaneously.In addition, in one embodiment, the refractive index Nd of the 4th lens 126
4Greater than 1.7, help to revise longitudinal chromatic aberration, improve the picture of separating of zoom lens 100.In addition, above-mentioned lens 212,222,224,226,228 equally all adopt spherical lens (Spherical Lens), therefore can make zoom lens 200 be easy to also can reach the purpose that reduces cost simultaneously outside production and the processing.
Similarly, because the structural similarity of zoom lens 200 and zoom lens 100, main difference is that the 3rd lens 224 are biconvex lens, so zoom lens 200 has the mentioned advantage of zoom lens 100 equally.In other words, if that zoom lens 200 meets is aforesaid 0.4＜| f
4/ f
w|＜0.6 and 1＜| F/Nd
2|＜1.6 at least one of them the time, its overall dimensions and optical quality thereof also can obtain preferable performance.
Following content will be enumerated an embodiment of zoom lens 200.Be noted that, listed data information is not in order to limit the present invention in the following table four, any those skilled in the art when using principle of the present invention its parameter or setting are done suitable change, but it must belong in the category of the present invention after reference the present invention.
(table four)
Similarly, in table four, radius-of-curvature is meant the radius-of-curvature that each is surperficial, and spacing is meant the air line distance on optical axis A between two adjacent surfaces.For instance, the spacing of surperficial S1, promptly surperficial S1 is to the air line distance on optical axis A between surperficial S2.The pairing thickness of each lens, refractive index and Abbe number please refer to each spacing in the same column, refractive index and Abbe number value corresponding in the remarks column.In addition, in table four, S1, S2 are two surfaces of first lens 212 on the surface, S3, S4 are two surfaces of second lens 222 on the surface, surface S5, S6 are two surfaces of the 3rd lens 224, and surperficial S7 is an aperture diaphragm 220, and surperficial S8, S9 are two surfaces of the 4th lens 226, surface S10, S11 are two surfaces of the 5th lens 228, and surperficial S12 is the surface of glass cover 70.
(table five)
Some important parameter values when the focal length of listing zoom lens 200 in table five respectively is wide-angle side and telescope end, comprise effective focal length (effective focal length, EFL), F numerical value and variable spacing d1, d2.
(table six)
| Length overall L (mm) | 84.153 |
| Effective focal length f w(mm) | 21.79 |
| Effective focal length f4 (mm) | -11.872 |
| |f4/f w| | 0.545 |
| F w/Nd2 | 1.516 |
| F t/Nd2 | 1.598 |
In addition, some the important parameter values the when focal length of then listing zoom lens 200 in table six switches to wide-angle side and telescope end, it comprises the overall length L of zoom lens 200, the effective focal length f of zoom lens 200
w, the 4th lens 226 effective focal length f
4, f
4/ f
wAbsolute value and F
w/ Nd
2With F
tThe numerical value of/Nd2.
Fig. 4 A to Fig. 4 B is respectively the optical quality reference picture of the focal length of the zoom lens of Fig. 3 A to Fig. 3 B when being wide-angle side and telescope end.Can learn in the curve of the longitudinal spherical aberration (longitudinal spherical aberration) that is presented by Fig. 4 A and Fig. 4 B, the astigmatism curvature of field (astigmatic fieldcurves), distortion (distortion) and lateral chromatic aberration (lateral color), the shown figure that goes out of zoom lens 200 is all in the scope of standard, so the focal length of zoom lens 200 all has good image quality when being wide-angle side and telescope end.
The focal length that Fig. 5 A and Fig. 5 B are respectively the zoom lens of further embodiment of this invention is the synoptic diagram of wide-angle side and telescope end.Please be simultaneously with reference to Figure 1A, Figure 1B, Fig. 5 A and Fig. 5 B, the zoom lens 300 of present embodiment is similar to zoom lens 100, is disposed between the 4th lens 326 and the 5th lens 328 but topmost between the two difference is aperture diaphragm 330.In the present embodiment, first lens 312 for example are concave surfaces (surperficial S2) towards the picture side, and convex surface (surperficial S1) is towards the meniscus of thing side.Second lens 322 for example are biconvex lens.The 3rd lens 324 for example are concave surfaces (surperficial S6) towards the picture side, and convex surface (surperficial S5) is towards the concave-convex lens of thing side.The 4th lens 326 for example are biconcave lenss, and the 5th lens 328 for example are biconvex lens.Yet the present invention is as limit, and in other embodiment, above-mentioned lens also can have and are different from above-mentioned shape, decide on actual situation.Similarly, because the 4th lens 326 provide unique negative focal length for second lens group 320, therefore the overall aberration in the time of can reducing zoom lens 300 and carry out imaging, as longitudinal chromatic aberration (Longitudinal chromaticaberration), or the aberration that relative position produced of balance zoom lens 300 each lens when carrying out zoom simultaneously.In addition, in one embodiment, the refractive index Nd of the 4th lens 126
4Greater than 1.7, can help to revise longitudinal chromatic aberration, improve the picture of separating of zoom lens 100.In addition, above-mentioned lens 312,322,324,326,328 equally all adopt spherical lens (Spherical Lens), therefore can make zoom lens 300 be easy to also can reach the purpose that reduces cost simultaneously outside production and the processing.
Similarly, because the structural similarity of zoom lens 300 and zoom lens 100, main difference is that aperture diaphragm 330 is disposed between the 4th lens 326 and the 5th lens 328, so zoom lens 300 has the mentioned advantage of zoom lens 100 equally.In other words, if zoom lens 300 meet aforesaid condition 0.4＜| f
4/ f
w|＜0.6 and 1＜| F/Nd
2|＜1.6 at least one of them the time, its overall dimensions and optical quality thereof also can obtain preferable performance.
Following content will be enumerated an embodiment of zoom lens 300.Be noted that, listed data information is not in order to limit the present invention in the following table seven, any those skilled in the art when using principle of the present invention its parameter or setting are done suitable change, but it must belong in the category of the present invention after reference the present invention.
(table seven)
Similarly, in table seven, radius-of-curvature is meant the radius-of-curvature that each is surperficial, and spacing is meant the air line distance on optical axis A between two adjacent surfaces.For instance, distance between the surperficial S1, promptly surperficial S1 is to the air line distance on optical axis A between surperficial S2.The pairing thickness of each lens, refractive index and Abbe number please refer to each spacing in the same column, refractive index and Abbe number value corresponding in the remarks column.In addition, in table seven, S1, S2 are two surfaces of first lens 312 on the surface, S3, S4 are two surfaces of second lens 322 on the surface, surface S5, S6 are two surfaces of the 3rd lens 324, and surperficial S7, S8 are two surfaces of the 4th lens 226, and surperficial S9 is an aperture diaphragm 330, surface S10, S11 are two surfaces of the 5th lens 228, and surperficial S12 is the surface of glass cover 70.
(table eight)
Some important parameter values when the focal length of listing zoom lens 300 in table eight respectively is wide-angle side and telescope end, comprise effective focal length (effective focal length, EFL), F numerical value and variable spacing d1, d2.
(table nine)
| Length overall L (mm) | 86.77 |
| Effective focal length f w(mm) | 21.835 |
| Effective focal length f 4(mm) | -12.207 |
| |f4/f w| | 0.545 |
| F w/Nd 2 | 1.51 |
| F t/Nd 2 | 1.576 |
In addition, some the important parameter values the when focal length of then listing zoom lens 300 in table nine switches to wide-angle side and telescope end, it comprises the overall length L of zoom lens 300, the effective focal length f of zoom lens 300
w, the 4th lens 326 effective focal length f
4, f
4/ f
wAbsolute value and F
w/ Nd
2With F
t/ Nd
2Numerical value.
Fig. 6 A to Fig. 6 B is respectively the optical quality reference picture of the focal length of the zoom lens of Fig. 5 A to Fig. 5 B when being wide-angle side and telescope end.Can learn in the curve of the longitudinal spherical aberration (longitudinal spherical aberration) that is presented by Fig. 6 A and Fig. 6 B, the astigmatism curvature of field (astigmatic fieldcurves), distortion (distortion) and lateral chromatic aberration (lateral color), the shown figure that goes out of zoom lens 300 is all in the scope of standard, so the focal length of zoom lens 300 all has good image quality when being wide-angle side and telescope end.
In sum, embodiments of the invention can reach the one at least of following effect.Because the lens in the zoom lens all are to use spherical lens, therefore can make zoom lens be easy to also can reach the purpose that reduces cost simultaneously outside production and the processing.Secondly, the zoom lens that embodiments of the invention provide can reach effective elimination aberration, aberration, distortion and have the good above-mentioned effects of one of them at least such as image quality if satisfy its a period of time at least of aforesaid optical condition.Moreover zoom lens can use the lens (as: 5) of lesser amt and reach the purpose of zoom.In addition, therefore, the zoom lens that embodiments of the invention provide, it has the lower and better optical characteristics of cost of manufacture simultaneously concurrently.
The above only is preferred embodiment of the present invention, can not limit scope of the invention process with this, and promptly every simple equivalent of doing according to claims of the present invention and description changes and modifies, and all still belongs in the scope that patent of the present invention contains.Arbitrary embodiment of the present invention in addition or claim must not reach the disclosed whole purposes of the present invention or advantage or characteristics.In addition, summary part and denomination of invention only are the usefulness that is used for assisting the patent document retrieval, are not to be used for limiting interest field of the present invention.
Main designation tabulation
70: glass cover
100,200,300: zoom lens
110,210,310: the first lens groups
112,212,312: the first lens
120,220,320: the second lens groups
122,222,322: the second lens
124,224,324: the three lens
126,226,326: the four lens
128,228,328: the five lens
130,230,330: aperture diaphragm
A: optical axis
L: length overall
D1, d2: distance
S1～S12: surface
The P1 imaging surface
Claims (21)
1. zoom lens comprises:
One first lens group has negative diopter, and this first lens group comprises one first lens, and wherein the diopter of these first lens is for negative; And
One second lens group, has positive diopter, and be disposed between this first lens group and the picture side, this second lens group comprises from a thing side to these one second lens of arranging in regular turn as side, one the 3rd lens, one the 4th lens and one the 5th lens, and the diopter of these second lens, the 3rd lens, the 4th lens and the 5th lens in regular turn for just, positive and negative, just
Wherein, this first lens group and this second lens group are suitable for moving between this thing side and this are as side, so that this zoom lens switches between a wide-angle side and a telescope end, the refractive index of these second lens is Nd
2, the numerical aperture of this zoom lens is F, and this zoom lens satisfy 1＜| F/Nd
2|＜1.6.
2. zoom lens as claimed in claim 1, wherein the effective focal length of the 4th lens is f
4, the effective focal length when this zoom lens switches to this wide-angle side is f
w, and this zoom lens satisfy 0.4＜| f
4/ f
w|＜0.6.
3. zoom lens as claimed in claim 1, wherein the refractive index of the 4th lens is greater than 1.7.
4. zoom lens as claimed in claim 1, wherein these first lens, these second lens, the 3rd lens, the 4th lens and the 5th lens respectively are a spherical lens.
5. zoom lens as claimed in claim 1, wherein these first lens, these second lens, the 3rd lens, the 4th lens and the 5th lens are a convex surface towards the meniscus of this thing side, a biconvex lens, a concave surface towards this concave-convex lens as side, a biconcave lens and a biconvex lens in regular turn.
6. zoom lens as claimed in claim 1, wherein these first lens, these second lens, the 3rd lens, the 4th lens and the 5th lens are meniscus, a biconvex lens, a biconvex lens, a biconcave lens and the biconvex lens of a convex surface towards this thing side in regular turn.
7. zoom lens as claimed in claim 1 also comprises an aperture diaphragm, is disposed between the 3rd lens and the 4th lens.
8. zoom lens as claimed in claim 1 also comprises an aperture diaphragm, is disposed between the 4th lens and the 5th lens.
9. zoom lens as claimed in claim 1, wherein when this first lens group and this second lens group moved towards away from each other direction, this zoom lens was switched toward this wide-angle side by this telescope end.
10. zoom lens as claimed in claim 1, wherein when this first lens group and this second lens group when moving near each other direction, this zoom lens is switched toward this telescope end by this wide-angle side.
11. zoom lens as claimed in claim 1, wherein this first lens group is a focusing group and a zoom group, and this second lens group is a zoom group.
12. a zoom lens comprises:
One first lens group has negative diopter, and this first lens group comprises one first lens, and wherein the diopter of these first lens is for negative; And
One second lens group, has positive diopter, and be disposed between this first lens group and the picture side, this second lens group comprises from a thing side to these one second lens of arranging in regular turn as side, one the 3rd lens, one the 4th lens and one the 5th lens, and the diopter of these second lens, the 3rd lens, the 4th lens and the 5th lens in regular turn for just, positive and negative, just
Wherein, the effective focal length of the 4th lens is f
4, this first lens group and this second lens group are suitable for moving between this thing side and this are as side, so that this zoom lens switches between a wide-angle side and a telescope end, the effective focal length when this zoom lens switches to this wide-angle side is f
w, and this zoom lens satisfy 0.4＜| f
4/ f
w|＜0.6.
13. zoom lens as claimed in claim 12, wherein the refractive index of the 4th lens is greater than 1.7.
14. zoom lens as claimed in claim 12, wherein these first lens, these second lens, the 3rd lens, the 4th lens and the 5th lens respectively are a spherical lens.
15. zoom lens as claimed in claim 12, wherein these first lens, these second lens, the 3rd lens, the 4th lens and the 5th lens are a convex surface towards the meniscus of this thing side, a biconvex lens, a concave surface towards this concave-convex lens as side, a biconcave lens and a biconvex lens in regular turn.
16. zoom lens as claimed in claim 12, wherein these first lens, these second lens, the 3rd lens, the 4th lens and the 5th lens are meniscus, a biconvex lens, a biconvex lens, a biconcave lens and the biconvex lens of a convex surface towards this thing side in regular turn.
17. zoom lens as claimed in claim 12 also comprises an aperture diaphragm, is disposed between the 3rd lens and the 4th lens.
18. zoom lens as claimed in claim 12 also comprises an aperture diaphragm, is disposed between the 4th lens and the 5th lens.
19. zoom lens as claimed in claim 12, wherein when this first lens group and this second lens group moved towards away from each other direction, this zoom lens was switched toward this wide-angle side by this telescope end.
20. zoom lens as claimed in claim 12, wherein when this first lens group and this second lens group when moving near each other direction, this zoom lens is switched toward this telescope end by this wide-angle side.
21. zoom lens as claimed in claim 12, wherein this first lens group is a focusing group and a zoom group, and this second lens group is a zoom group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010158646 CN102207607A (en) | 2010-03-31 | 2010-03-31 | Zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010158646 CN102207607A (en) | 2010-03-31 | 2010-03-31 | Zoom lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102207607A true CN102207607A (en) | 2011-10-05 |
Family
ID=44696525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010158646 Pending CN102207607A (en) | 2010-03-31 | 2010-03-31 | Zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102207607A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI460490B (en) * | 2011-12-09 | 2014-11-11 | Hon Hai Prec Ind Co Ltd | Zoom projection lens |
| CN104614841A (en) * | 2015-03-09 | 2015-05-13 | 襄阳锦翔光电科技股份有限公司 | Optical imaging lens |
| US9594233B2 (en) | 2014-12-16 | 2017-03-14 | Coretronic Corporation | Zoom lens |
| CN108267846A (en) * | 2015-08-28 | 2018-07-10 | 苏州佳世达光电有限公司 | Projection lens and projection arrangement |
| CN109932800A (en) * | 2017-12-18 | 2019-06-25 | 上旸光学股份有限公司 | Zoom lens |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080094727A1 (en) * | 2006-10-23 | 2008-04-24 | Young Optics Inc. | Zoom lens |
-
2010
- 2010-03-31 CN CN 201010158646 patent/CN102207607A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080094727A1 (en) * | 2006-10-23 | 2008-04-24 | Young Optics Inc. | Zoom lens |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI460490B (en) * | 2011-12-09 | 2014-11-11 | Hon Hai Prec Ind Co Ltd | Zoom projection lens |
| US9594233B2 (en) | 2014-12-16 | 2017-03-14 | Coretronic Corporation | Zoom lens |
| CN104614841A (en) * | 2015-03-09 | 2015-05-13 | 襄阳锦翔光电科技股份有限公司 | Optical imaging lens |
| CN108267846A (en) * | 2015-08-28 | 2018-07-10 | 苏州佳世达光电有限公司 | Projection lens and projection arrangement |
| CN109932800A (en) * | 2017-12-18 | 2019-06-25 | 上旸光学股份有限公司 | Zoom lens |
| CN109932800B (en) * | 2017-12-18 | 2022-03-25 | 上旸光学股份有限公司 | Zoom lens |
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Application publication date: 20111005 |