CN1763580A - Focus multiple changing lens - Google Patents
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- CN1763580A CN1763580A CNA2005100727322A CN200510072732A CN1763580A CN 1763580 A CN1763580 A CN 1763580A CN A2005100727322 A CNA2005100727322 A CN A2005100727322A CN 200510072732 A CN200510072732 A CN 200510072732A CN 1763580 A CN1763580 A CN 1763580A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
- G02B15/1435—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative
- G02B15/143507—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative arranged -++
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0087—Simple or compound lenses with index gradient
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/04—Simple or compound lenses with non-spherical faces with continuous faces that are rotationally symmetrical but deviate from a true sphere, e.g. so called "aspheric" lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
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Abstract
The present invention provides a zoom lens which has a wide viewing angle, a low cost and a high zoom ratio, and is made small-sized (thin). The zoom lens is provided with a first lens group G1, a second lens group G2 and a third lens group G3 in the order from the object side. The first lens group G1 is provided with a first lens 1 having negative power and a prism 2 which is positioned on the post step of the first lens 1, deflects an optical path and has positive power. Further, Abbe number of the first lens 1 is larger than the Abbe number of the prism 2.
Description
Technical field
The present invention is the invention that relates to Zoom lens, for example can be applicable to portable phone with camera etc.
Background technology
As the relevant technology that is equipped on the small-sized Zoom lens of portable phone or digital camera etc., patent documentation 1 to 3 is for example arranged.
To patent documentation 3 disclosed Zoom lens, in first lens combination, make the light path bending at above-mentioned patent documentation 1.The slimming of portable phone etc. just becomes possibility thus.
For the situations such as portable phone of band camera, the cameraman needs field angle 2 ω to become 75 ° degree (promptly requiring wide-angle) in order oneself to take oneself.
But in the related invention of patent documentation 1, field angle 2 ω are little of 68 °.In addition, in the related invention of patent documentation 2, field angle 2 ω are also little of 61 °.
And then, in the related invention of the related invention of patent documentation 1 and patent documentation 3, owing to used the parts of a part of glass, so its cost becomes higher.
In addition, in the related invention of patent documentation 2, it is little of 2 times of degree to become multiple proportions.And then owing in the related invention of patent documentation 3, need to use nearly 9 lens of sheet number, therefore, it is bigger that the size of Zoom lens integral body also becomes.
[patent documentation 1] spy opens the 2004-70235 communique
[patent documentation 2] spy opens the 2004-53993 communique
[patent documentation 3] spy opens the 2000-131610 communique
Summary of the invention
Therefore, the present invention finishes in view of above-mentioned each problem points, its objective is the Zoom lens that wide visual field angle, cheapness, hypermutation multiple proportions and more small-sized (slim) are provided.
In order to achieve the above object, technical scheme 1 of the present invention provides a kind of Zoom lens, begin from the object space side, has stationkeeping when becoming times in the following order, the 1st lens combination with negative power (Power), position changeable when becoming times, the 2nd lens combination with positive light coke, position changeable when becoming times, the 3rd lens combination with positive light coke, be a kind ofly to carry out above-mentioned change Zoom lens doubly by the interval that changes each lens combination, wherein above-mentioned the 1st lens combination has been equipped with the 1st lens with negative power and the back segment that is positioned at above-mentioned the 1st lens, have the prism that bends the light path function and have positive light coke, the Abbe number of above-mentioned the 1st lens is greater than the Abbe number of above-mentioned prism.
Because the Zoom lens that the present invention's technical scheme 1 is put down in writing begins from the object space side, has stationkeeping when becoming times in the following order, the 1st lens combination with negative power, position changeable when becoming times, the 2nd lens combination with positive light coke, position changeable when becoming times, the 3rd lens combination with positive light coke, be a kind ofly to carry out above-mentioned change Zoom lens doubly by the interval that changes each lens combination, its above-mentioned the 1st lens combination has been equipped with the 1st lens with negative power and the back segment that is positioned at above-mentioned the 1st lens, have the prism that bends the light path function and have positive light coke, the Abbe number of above-mentioned the 1st lens is greater than the Abbe number of above-mentioned prism, so the ratio chromatism, that produces can utilize the prismatic correction with positive light coke to strengthen the negative power of the 1st lens the time.Owing to can carry out this corrections, so in the related Zoom lens of technical scheme 1, can design the focal power of bearing of the 1st lens combination biglyyer.So, by strengthening the negative power of the 1st lens combination, just can realize the wide visual field angleization of the 1st lens combination.In addition, since can also incident in the 1st lens combination from the light of wide-angle more, so can further reduce the bore of the 1st lens combination.And then, by strengthening the negative focal power of the 1st lens combination, can shorten rear cut-off distance (promptly shortening optical full length).Thereby, can make the whole further densification of variable multiple lens system.In addition, proofread and correct, become the multiple proportions increase so can also make owing to can carry out ratio chromatism, effectively in the 1st lens combination.
Description of drawings
Shown in Figure 1 is the pie graph of the related Zoom lens of example 1.
Shown in Figure 2 is the pie graph of the related Zoom lens of example 1.
Shown in Figure 3 is situation at the various aberrations of the wide-angle side of the related Zoom lens of example 1.
Shown in Figure 4 is the situation of the various aberrations at place in the middle of the related Zoom lens of example 1.
Shown in Figure 5 is situation at the various aberrations of the telescope end of the related Zoom lens of example 1.
Shown in Figure 6 is the pie graph of the related Zoom lens of example 2.
Shown in Figure 7 is the pie graph of the related Zoom lens of example 2.
Shown in Figure 8 is situation at the various aberrations of the wide-angle side of the related Zoom lens of example 2.
Shown in Figure 9 is the situation of the various aberrations at place in the middle of the related Zoom lens of example 2.
Shown in Figure 10 is situation at the various aberrations of the telescope end of the related Zoom lens of example 2.
Embodiment
Below, specifically describe the present invention based on the accompanying drawing of representing its example.
＜example 1 〉
The related Zoom lens of this example is 3 groups of Zoom lens that constitute.
The formation that relates to the Zoom lens of this example shown in Figure 1.Fig. 2 is a pie graph of having drawn the light path of the Zoom lens that Fig. 1 provides point-blank.Here, the prism with internal reflection surface is represented with parallel flat in Fig. 2.In addition, in Fig. 1 and Fig. 2, be the leading portion side, being rear section side as square side with the object space side.
In addition, in Fig. 1, Fig. 2, ri (i=1,2,3 ...) be i face from object space side number, along with becoming big near its numeral of picture side's side.Also has di (i=1,2,3 ...) be interval above i axle of object space side number, along with becoming big near its numeral of picture side's side.
As shown in Figure 1 and Figure 2, to picture side's side, sequentially arranging the 1st lens combination G1, the 2nd lens combination G2 and the 3rd lens combination G3 from the object space side.Here, the 2nd lens combination G2 is the transducer with anamorphosis function.The 3rd lens combination G3 carries out the corrector that picture point is proofreaied and correct.
In Fig. 1, Zoom lens shown in Figure 2, become doubly by the interval variation that makes each lens combination G1, G2, G3.
In specific words, become doubly by direction M, the N that each lens combination G1～G3 is moved to arrow shown in Figure 2 exactly.As shown in Figure 2, the 1st lens combination G1 not change of position when becoming times.In addition, when becoming doubly (particularly carry out from wide-angle side (W) to telescope end (T) change times), if the 2nd lens combination G2 moves to the leading portion direction along optical axis, then the 3rd lens combination G3 moves to leading portion side (with reference to Fig. 2) again after once moving to rear section side along optical axis.
The 1st lens combination G1 does not produce change in location and has negative focal power when becoming times.The 2nd lens combination G2 changing position and have positive focal power when becoming times.The 3rd lens combination G3 changing position and have positive focal power when becoming times.
Here, the leading portion at the 2nd lens combination G2 has disposed diaphragm S1.In addition, in the backend configuration of the 3rd lens combination G3 the cutoff filter F1 that constitutes by parallel flat, in the backend configuration of this cutoff filter F1 optics image planes P1.
At this, optics image planes P1 is such as solid-state imagers such as CCD that is made up of a plurality of pixels (ChargeCoupled Device) or CMOS (Complementary MOS) sensors.By this imaging apparatus, the optical image that utilizes Zoom lens to form can be transformed into electric signal.In addition, also can replace cutoff filter F1 to use low-pass filter or the cover glass that constitutes by parallel flat.
Below, the concrete formation of each lens combination G1～G3 is described.
The 1st lens combination G1 is made of the 1st lens 1 and prism 2 as shown in Figure 1 and Figure 2.
The 1st lens 1 are configured in the most close object space side, have negative focal power.Prism 2 is positioned at the back segment of the 1st lens 1, has positive focal power.
The object space side r1 of the 1st lens 1 and the curve form that is concavity as square side r2, and the mask of its a certain side has aspherical shape at least.By this curve form, the 1st lens 1 integral body has negative focal power.
In addition, prism 2 has bent 90 ° at reflecting surface r4 with optical axis Z1 (light path).Like this, by utilizing prism 2 bending light paths, can shorten the length of the lens combination incident light axis direction direction (above-below direction of Fig. 1) of the inside (promptly towards) and make it constant.Here, at the reflecting surface r4 of prism 2 evaporation as aluminium etc.Thus, can make the loss of luminous energy is Min..
Here, the bending angle of the optical axis Z1 (light path) of above-mentioned reflecting surface r4 both can be the angle outside 90 °, also can set its angle as required.In addition, both can make this reflecting surface r4 have focal power, and also can replace reflecting surface to use plane of refraction or diffraction surfaces bending optical axis Z1 (light path).
In addition, the object space side r3 of prism 2 is curve forms of convex, and side, the picture side r5 of prism 2 is curve forms of concavity.By this curve form, prism 2 integral body have positive focal power.
Also have, the Abbe number of the 1st lens 1 is greater than the Abbe number of prism 2.
But the distribution of the Abbe number of plastics system lens etc. is in 27～34 the scope of being distributed in and in 49～58 the scope.Thereby when utilizing plastics to prepare the 1st lens 1 and prism 2, as the 1st lens 1, should adopt Abbe number is material more than 49 and 49, can adopt Abbe number less than 35 material as prism 2.
Below, the concrete formation of the 2nd lens combination G2 is described.
The 2nd lens combination G2 is made of the 2nd lens 3 and the 3rd lens 4 as shown in Figure 1 and Figure 2.
The 2nd lens 3 are configured in the back segment of the 1st lens combination G1, have positive focal power.The 3rd lens 4 are positioned at the back segment of the 2nd lens 3, have negative focal power.
The object space side r6 of the 2nd lens 3 and the curve form that is convex as square side r7, and the mask of its a certain side has aspherical shape at least.By this curve form, the 2nd lens 3 integral body have positive focal power.
In addition, the object space side r8 of the 3rd lens 4 and the curve form that is concavity as square side r9, by this curve form, the 3rd lens 4 integral body have negative focal power.
In addition, the Abbe number of the 2nd lens 3 is greater than the Abbe number of the 3rd lens 4.For example, when having adopted plastic the 2nd lens 3 and the 3rd lens 4,, should adopt Abbe number 49 and 49 above materials, can adopt Abbe number less than 35 material as the 3rd lens 4 as the 2nd lens 3.
Here, the 3rd lens combination G3 only is made of lens 5 as shown in Figure 1 and Figure 2.
Here, in the related Zoom lens of this example, can make it to satisfy following relational expression (1), (2) by design.
1.5＜-f1/fW＜4.0 …(1)
1.0＜-f2/f1＜2.0 …(2)
At this, f1 is the focal length of the 1st lens combination G1.FW is the focal length of the variable multiple lens system integral body of wide-angle side.F2 is the focal length of the 2nd lens combination G2.
Because the related Zoom lens of this example has as above such formation, so it has effect as follows.
Be equipped with the Abbe number of the Abbe number of prism 2, the 1 lens 1 in the related Zoom lens of this example greater than prism 2 with positive focal power.
Thereby, can proofread and correct the ratio chromatism, that produces when the 1st lens 1 have strengthened negative focal power by prism 2 with positive focal power.Because can carry out this correction, so in the related Zoom lens of this example, can design the negative power of the 1st lens combination G1 biglyyer.
Like this, by strengthening the negative focal power of the 1st lens combination G1, the wide visual field angleization of the 1st lens combination G1 just becomes possibility.In addition, in the 1st lens combination G1 since can also incident from the light of wide visual field angle more, so can further reduce the bore of the 1st lens combination G1.And then, by strengthening the negative focal power of the 1st lens combination, can shorten rear cut-off distance (shortening optical full length).Thereby, can make the whole further densification of variable multiple lens system.
In addition, in the related Zoom lens of this example, proofread and correct, become multiple proportions (pantograph ratio) increase so can also make owing to can carry out ratio chromatism, effectively at the 1st lens combination G1.
In addition, can obtain Abbe number poor of the 1st lens 1 Abbe number and prism 2 biglyyer.At this moment, even do not obtain positive light coke poor of the negative power of the 1st lens 1 and prism 2 significantly, also can proofread and correct the ratio chromatism, that produces at the 1st lens 1 place at prism 2 places.
That is, the Abbe number of prism 2 is more little, and perhaps the Abbe number of the 1st lens 1 is big more, and then the positive light coke of prism 2 is less gets final product, and perhaps can set the negative focal power of the 1st lens 1 biglyyer.
As above-mentioned, get final product if the positive light coke of prism 2 is less, then can further reduce the curvature of this prism 2.Thus, can easily make prism 2.In addition, if the positive focal power of prism 2 is little, then also has the effect that easily to carry out the formation of variable multiple lens system integral body.
Here, the Abbe number of lens etc. is different because of the material that constitutes this lens etc.When having adopted plastic lens etc., can adopt Abbe number as the 1st lens 1 is the material of the material of 49～58 (more than 49 or 49), and can adopt Abbe number as prism 2 is the material of the material of 27～34 (less than 35).
In addition, usually, Abbe number is more little, and refractive index is big more.Thereby as above-mentioned, then the refractive index of prism 2 will be big more to reduce the Abbe number of prism 2 more.Like this, if becoming big, the refractive index of prism 2 can reduce the inclination angle in the prism 2 of chief ray of wide-angle side.Thereby, can miniaturization the 1st lens combination G1.
But, adopted plastic 1st lens 1 lower here than glass materials refractive index.At this moment, because the refractive index ratio of the 1st lens 1 is less, so if strengthen negative focal power then will produce the bigger distortion aberration of bearing in the wide-angle side of the 1st lens 1.
Therefore, in the related Zoom lens of this example, at least one face of the 1st lens 1 will adopt aspheric surface.Thus, can carry out the correction of above-mentioned negative distortion aberration.Thereby, can further strengthen the negative focal power of the 1st lens combination G1.
In addition, as the 2nd lens 3, adopted the material (for example plastics) of the little material of refractive index here.At this moment, because the refractive index of the 2nd lens 3 reduces, so can utilize the 2nd lens 3 to produce the spherical aberration of bearing with positive light coke.
Therefore, in the related Zoom lens of this example, at least one face with the 2nd lens 3 of positive light coke will adopt aspheric surface.Thus, can carry out the correction of above-mentioned spherical aberration.
In above-mentioned (1) formula, such as everyone knows, if (f1/fW) become 1.5 and can not strengthen the change multiple proportions with next, it is low that multiplying power will become.Otherwise, if (f1/fW) become more than 4.0 then rear cut-off distance is elongated, the length of variable multiple lens system integral body is elongated.Thereby above-mentioned by satisfying (1) formula can be taken into account the densification that becomes multiple proportions and variable multiple lens system.
In addition, the 2nd lens combination G2 of the related Zoom lens of this example in the backend configuration of the 2nd lens 3 with positive focal power have the 3rd lens 4 of negative focal power.And then, make the Abbe number of the Abbe number of the 2nd lens 3 greater than the 3rd lens 4.
Thereby, can proofread and correct the axle that produces by the 2nd lens 3 by above-mentioned the 3rd lens 4 and go up aberration with positive focal power.
But the number that normally increases the curved surface of variable multiple lens system more can be carried out the correction of each aberration more more effectively.
Therefore, in the related Zoom lens of this example, two face r3, r5 of prism 2 are curve forms.Thereby, utilize this prism 2 can proofread and correct the ratio chromatism, that produces at the 1st lens 1 more effectively.
In addition, in the related Zoom lens of this example, also can utilize the plastics of lightweight cheapness to constitute all lens and prism.
Thus, can seek the cost degradation of variable multiple lens system integral body.In addition, owing to be lightweight,, also can suppress the impulsive force of this variable multiple lens system is made it to become Min. even maloperation makes the device that carries this variable multiple lens system drop into ground.The variable multiple lens system of resistance to impact excellence promptly can be provided.
In following formula (2), if (f2/f1) become below 1.0, then can produce negative curvature of the image.It is based on following reason.
That is, the absolute value that need to satisfy the negative focal power of the 1st lens combination G1 equals the absolute value sum of the positive focal power of the absolute value of positive focal power of the 2nd lens combination G2 and the 3rd lens combination G3.But, (f2/f1) become 1.0 when following, the absolute value of the positive focal power of the 2nd lens combination G2 (| 1/f2|) will above the absolute value of the negative focal power of the 1st lens combination G1 (| 1/f1|).Thereby as a result of, this situation will produce negative curvature of the image.
So, even the negative curvature of the image that in variable multiple lens system, adopts aspheric surface also will be difficult to proofread and correct to be produced morely.
In addition, if (f2/f1) become more than 2.0, then when becoming times, the 2nd lens combination G2 will produce with the 3rd lens combination G3 and conflict.And then, if (f2/f1) become more than 2.0, then the bore of the 1st lens combination G1 will be greatly to the degree that can not on portable phone etc., carry, can't be practical, wide visual field angleization also becomes impossible together with it, and then it is impossible that the densification of variable multiple lens system also becomes.
But, in the related Zoom lens of this example, because it has satisfied following formula (2), so can eliminate above-mentioned each problem points.Here, " 2.0 " of the upper limit rule of thumb rule determine.
In addition, in can not the Zoom lens with prism 2 bending optical axis Z1 types, the total length for the variable multiple lens system that shortens the object space side direction when not using camera, can be kept at camera lens part (telescoping mechanism) in the device.
Can in portable phone, use the Zoom lens of this telescoping mechanism.In this case, if it is underground this portable phone to be dropped in shooting (state that lens barrel highlights from device) process, then exists outstanding lens barrel directly to collide ground and cause the possibility of the damage of camera lens.
But the related Zoom lens of this example is not a telescoping mechanism, but has adopted use prism 2 vertically to bend the mechanism of optical axis Z1 (light path).Thus, even when depth is narrow and small, do not need to make the lens barrel part from device, to highlight at the device (portable phone etc.) that carries variable multiple lens system yet.Thereby, even having taken place to fall, this device can prevent that also lens barrel from directly conflicting with ground.
This Zoom lens with bending optical axis Z1 (light path) mechanism is equipped on the portable phone that often used rambunctiously etc. when going up in anticipation, can further bring into play above-mentioned effect.
＜embodiment 1 〉
Provide the analog result of the Zoom lens that relates to Fig. 1, example 1 shown in Figure 2 below.Table 1 is the concrete composition data of embodiment 1.Table 2 is the tables that provided the asphericity coefficient of each lens.
[table 1]
| Radius-of-curvature (mm) | (mm) at interval | Refractive index | Abbe number |
| r1＝-18.493 | d1＝1 | n1＝1.53 | ν1＝55.8 |
| r2＝2.862 | d2＝1.4551 | ||
| r3＝6.703 | d3＝4.4426 | n2＝1.583 | ν2＝30 |
| r4＝∞ | d4＝3.1324 | ||
| r5＝48.319 | d5＝9.7845～5.5353～0.2191 | n3＝1.53 | ν3＝55.8 |
| r6＝2.967 | d6＝2.6486 | ||
| r7＝-3.738 | d7＝0.04 | n4＝1.583 | ν4＝30 |
| r8＝-7.432 | d8＝0.8 | ||
| r9＝3.266 | d9＝0.8527～7.0999～9.8874 | n5＝1.53 | ν5＝55.8 |
| r10＝7.294 | d10＝2.551 | ||
| r11＝54.464 | d11＝3.1633～1.1652～3.6939 | n6＝1.54 | ν6＝62 |
| r12＝∞ | d12＝0.3 | ||
| r13＝∞ | d13＝0.36 | ||
| r14＝∞ |
[table 2]
| K | A | B | C | D | |
| r1 | 9.019666 | 3.98700×10 -4 | -1.24870×10 -5 | 2.92321×10 -7 | 1.09471×10 -9 |
| r2 | -2.149265 | 2.55315×10 -3 | -6.55564×10 -5 | -1.19088×10 -6 | 3.90826×10 -9 |
| r3 | -0.286075 | -2.00583×10 -3 | 1.29322×10 -4 | -4.49420×10 -6 | 6.25525×10 -8 |
| r5 | 5.171699 | -7.36408×10 -4 | 1.00495×10 -4 | -7.23102×10 -6 | 4.78492×10 -7 |
| r6 | -0.342312 | -8.03781×10 -4 | -9.67955×10 -5 | -4.79059×10 -5 | 2.00424×10 -5 |
| r7 | 1.046609 | 2.59314×10 -2 | -8.53738×10 -3 | 3.21900×10 -3 | -3.58009×10 -4 |
| r8 | 6.559824 | 1.24206×10 -2 | -4.69606×10 -3 | 2.19440×10 -3 | -2.23997×10 -4 |
| r9 | -1.110803 | 3.86822×10 -3 | 4.14872×10 -3 | -4.30469×10 -4 | 7.94904×10 -5 |
| r10 | -0.985657 | 2.37674×10 -3 | -7.05714×10 -5 | 1.65534×10 -5 | -1.48563×10 -7 |
| r11 | -9.478932 | 3.56637×10 -3 | -2.57068×10 -5 | -1.46108×10 -5 | 5.04971×10 -6 |
In the table 1, ri is from the radius-of-curvature of the face of the lens of object space side i sequence number (perhaps prism, optical filter) (being radius-of-curvature on the axle in aspheric surface).Here, infinitely-great radius-of-curvature represents that this face is the plane.
In the table 1, di is the distance of the face of the lens from the i sequence number (perhaps prism, optical filter) to the face of the lens that belong to the i+1 sequence number (perhaps prism, optical filter) from the object space side.Here, when becoming a times process middle distance di and change, this di by wide-angle side (short focal length extremity, W)～middle (the middle focal length state, M)～telescope end (long focal length extremity, represent by order T).
In the table 1, ni is d (Huang) line (wavelength: the refractive index of 587.56nm) locating from the lens of object space side i sequence number (perhaps prism, optical filter).ν i is the Abbe number from the lens of object space side i sequence number (perhaps prism, optical filter).
In addition, in table 2, ri is the face sequence number from the curved surface of the lens (perhaps prism) of object space side i sequence number.
Have, the asphericity coefficient that table 2 provides is each coefficient that following formula provides again.
z＝ch
2/[1+{1·(1+k)c
2h
2}
1/2]+Ah
4+Bh
6+Ch
8+Dh
10
In the following formula, " z " is the degree of depth that connects the plane from the corresponding surface summit." c " is the paraxial curvature of face." h " is the height from optical axis." K " is the constant of the cone." A " is 4 asphericity coefficients." B " is 6 asphericity coefficients." C " is 8 asphericity coefficients." D " is 10 asphericity coefficients.
In embodiment 1,, adopted ゼ オ ネ ッ Network ス (registered trademark) E48R as the 1st lens the 1, the 2nd lens 3 and lens 5.In addition, as prism 2 and the 3rd lens 4, adopted PC (polycarbonate).That is, embodiment 1 related Zoom lens is made of 5 plastic lenss (comprising prism).Here, getting all planes of refraction is aspheric surface.
The analog result of the Zoom lens that the embodiment 1 of above-mentioned formation is related, its total system focal distance f (mm) is respectively 3.03 (W)～5.25 (M)～9.09 (T) corresponding to every kind of focal length state (W, M, T).In addition, F counts FNO and is respectively 3.2 (W)～4.6 (M)～5.9 (T) corresponding to every kind of focal length state (W, M, T).Also have, field angle 2 ω are respectively ° (M)～28.7,75.0 ° of (W)～47.8 ° (T) corresponding to every kind of focal length state (W, M, T).
And then, the analog result of the Zoom lens that the embodiment of above-mentioned formation 1 is related, the focal distance f 1 of its 1st lens combination G1 is-8.12mm.The focal distance f 2 of the 2nd lens combination G2 is 8.18mm.Focal distance f W in the variable multiple lens system integral body of wide-angle side is 3.03mm as described above.
By above-mentioned analog result as can be known, (value f1/fW) is 2.68.This value satisfies the relation of formula (1).In addition, (value f2/f1) is 1.01 also as can be known.This value satisfies the relation of formula (2).
In addition, the wide visual field angle in that field angle 2 ω of wide-angle side are 75.0 ° becomes multiple proportions (9.09/3.03) and also can guarantee about 3 times.
Having, is the aberration diagram of the related Zoom lens of embodiment 1 shown in Fig. 3,4,5 again.Here, Fig. 3 is the aberration diagram of wide-angle side (W).Fig. 4 is the aberration diagram at middle place (M).Fig. 5 is the aberration diagram of telescope end (T).In addition, in Fig. 3,4,5, from shown in the left side being spherical aberration diagram, astigmatism figure, distortion aberration diagram respectively.In addition, " FNO " expression F number, " Y " represents maximum image height (mm).
In each spherical aberration diagram, solid line (d) is represented corresponding d (Huang) line (wavelength: spherical aberration 587.56nm) (mm).Dotted line (g) is represented corresponding g (royal purple) line (wavelength: spherical aberration 435.84nm) (mm).Corresponding c (red) line (wavelength: spherical aberration 656.27nm) is represented in single-point line (c).
In astigmatism figure, the corresponding astigmatism (mm) of solid line (S) expression at the d of sagittal surface (Huang) line.The corresponding astigmatism (mm) of dotted line (M) expression at the d of meridian ellipse (Huang) line.
In the distortion aberration diagram, solid line is represented the distortion (%) of corresponding d (Huang) line.
In Fig. 3,4,5, each data line approximate convergence is in 0.Hence one can see that, and in the related Zoom lens of embodiment 1, various aberrations have obtained sufficient correction.Here, in the spherical aberration diagram of Fig. 5, near the aberration of g line height of incidence 0 becomes big a little.But, because near the value of aberration this height of incidence 0 deficiency 0.2mm, so can be described as and can proofread and correct fully.
＜example 2 〉
The related Zoom lens of this example also is 3 groups of Zoom lens that constitute.
Shown in Figure 6 is the formation of the related Zoom lens of this example.Shown in Figure 7 is the pie graph that has provided the light path of Zoom lens shown in Figure 6 point-blank.Here, the prism form with parallel flat in Fig. 7 with internal reflection surface provides.In addition, in Fig. 6, Fig. 7, be the leading portion side with the object space side, be rear section side as square side.
In addition, in Fig. 6, Fig. 7, ri (i=1,2,3 ...) be i face from object space side number, along with becoming big near its numeral of picture side's side.Also has di (i=1,2,3 ...) be interval above i axle of object space side number, along with becoming big near its numeral of picture side's side.
In Fig. 6, Zoom lens shown in Figure 7, become doubly by the interval variation that makes each lens combination G1, G2, G3.
In specific words, become doubly by direction M, the N that each lens combination G1～G3 is moved to arrow shown in Figure 7 exactly.As shown in Figure 7, the 1st lens combination G1 not change of position when becoming times.In addition, when becoming doubly (particularly carry out from wide-angle side (W) to telescope end (T) change times), if the 2nd lens combination G2 moves to the leading portion direction along optical axis, then the 3rd lens combination G3 moves to leading portion side (with reference to Fig. 7) again after once moving to rear section side along optical axis.
Though the formation of the Zoom lens that the Zoom lens that this example is related and example 1 are related is roughly the same, in both differences of following some place.Only mention difference below.Here, the Zoom lens related because of other formation and example 1 is identical, so omit its explanation at this.
In the related Zoom lens of this example, shown in Fig. 6,7 like that, the 1st lens combination G1 with negative focal power newly has been equipped with the 4th lens 10.The 4th lens 10 have negative focal power, are configured in the back segment of prism 2.
The object space side r6 of the 4th lens 10 is the curve form of concavity, side, the picture side r7 of the 4th lens 10 be convex curve form (here, be convex near the center of lens, become mild more, near the end of lens, be positive curvature (concavity)) the closer to the end curvature of lens.By this curve form, the 4th lens 10 integral body have negative focal power.In addition, the Abbe number of the 4th lens 10 is greater than the Abbe number of prism 2.
But the distribution of the Abbe number of plastics system lens etc. is distributed in 27～34 the scope and in 49～58 the scope.Thereby when utilizing plastics to prepare the 4th lens 10 and prism 2, as the 4th lens 10, should adopt Abbe number is material more than 49 or 49, then can adopt Abbe number less than 35 material as prism 2.
In addition, in this example, the object space side r1 of the 1st lens 1 is the curve form of convex.
In addition, in this example, the object space side r3 of prism 2 is the plane, and side, the picture side r5 of prism 2 is curve forms of convex.
Here, also can be opposite with foregoing, the object space side r3 that gets prism 2 is the curve form of convex, side, the picture side r5 of prism 2 is the plane.That is, the face of side, picture side which side of r5 of the object space side r3 of prism 2 and prism 2 be the plane all can, the face of opposite side adopts the shape that makes prism 2 integral body have positive focal power to get final product.
Here, in the related Zoom lens of this example, also can design and make it to satisfy above-mentioned various (1), (2).
Because the related Zoom lens of this example is above-mentioned such formation, so can further have effect shown below on the effect that illustrated by example 1.
In the related Zoom lens of this example, newly be provided with and have the 4th lens 10 Abbe number big, that have negative focal power than the Abbe number of prism 2.Thereby, can undertake the negative focal power of the 1st lens combination G1 by the 1st lens 1 and the 4th lens 10.Thus, the further thickness of attenuate the 1st lens 1 as a result of, can make the thickness of depth direction (above-below direction of Fig. 6) of Zoom lens thinner.
In addition, utilize can easily the distort correction of aberration of the 4th lens 10.
In the related Zoom lens of this example, the wherein side of the object space side r3 of prism 2 and side, picture side r5 is the plane.Thereby, can prevent the object space side r3 of prism 2 and depart from as the core of square side r5.Thus, high performance prism 2 can be easily made, the reduction of manufacturing cost can also be sought.
Here, in example 1,2, each lens and prism also can adopt has aspheric formation.Owing to can utilize various lens etc. to carry out the correction of various aberrations thus, can utilize the still less lens formation Zoom lens of sheet number.
Each lens combination that constitutes the related Zoom lens of example 1,2 only adopts by refraction the refractive lenses (that is, carrying out the lens of deflector type at the interface of the similar medium with different refractivity) of incident ray deflection is constituted.But be not to be to be only limited to this.
For example, also can utilize by diffraction and make the diffraction type lens of incident ray deflection, combination by diffraction and refraction action make the refraction diffraction mixed type lens of incident ray deflection, make the gradient-index lens etc. of incident ray deflection constitute each lens combination by the index distribution in the medium.
＜embodiment 2 〉
Provide the analog result of the Zoom lens that relates to Fig. 6, example 2 shown in Figure 7 below.Table 3 is concrete composition datas of embodiment 2.Table 4 is the tables that provided the asphericity coefficient of each lens.
[table 3]
| Radius-of-curvature (mm) | (mm) at interval | Refractive index | Abbe number |
| r1＝45.08 | d1＝1 | n1＝1.53 | ν1＝55.8 |
| r2＝3.863 | d2＝2.1476 | ||
| r3＝∞ | d3＝3.07984 | n2＝1.583 | ν2＝30 |
| r4＝∞ | d4＝3.8275 | ||
| r5＝-6.015 | d5＝0.3106 | n3＝1.53 | ν3＝55.8 |
| r6＝-4.515 | d6＝0.8 | ||
| r7＝-233.966 | d7＝8.5434～4.1115～0.1000 | n4＝1.53 | ν4＝55.8 |
| r8＝3.175 | d8＝2.7571 | ||
| r9＝-2.718 | d9＝0.04 | n5＝1.583 | ν5＝30 |
| r10＝-3.192 | d10＝1.676 | ||
| r11＝6.913 | d11＝0.7319～7.4304～5.7969 | n6＝1.53 | ν6＝55.8 |
| r12＝7.716 | d12＝1.8873 | ||
| r13＝17.948 | d13＝3.6772～1.4106～7.0556 | n6＝1.54 | ν7＝62 |
| r14＝∞ | d14＝0.3 | ||
| r15＝∞ | d15＝0.36 | ||
| r16＝∞ |
[table 4]
| K | A | B | C | D | |
| r1 | 6.09238 | -2.06131×10 -4 | -4.14820×10 -6 | 8.35189×10 -8 | -1.58442×10 -9 |
| r2 | -2.227474 | 2.50164×10 -3 | -7.89633×10 -5 | -1.04048×10 -6 | 0.00000 |
| r5 | -3.471222 | -5.86053×10 -4 | -1.01324×10 -5 | 7.02636×10 -7 | -2.52106×10 -9 |
| r6 | -0.876185 | -2.90016×10 -5 | 1.01906×10 -4 | -4.45417×10 -6 | -8.73927×10 -10 |
| r7 | 20 | -1.26559×10 -3 | 1.58136×10 -4 | 2.66501×10 -6 | -2.97642×10 -7 |
| r8 | 0.568148 | -4.57436×10 -3 | -3.90358×10 -4 | -1.39883×10 -4 | 1.23307×10 -5 |
| r9 | -0.694956 | 2.29952×10 -2 | -5.53387×10 -3 | 1.33990×10 -3 | -1.04124×10 -4 |
| r10 | -4.064361 | 6.43371×10 -3 | -2.82701×10 -3 | 9.90152×10 -4 | -8.34205×10 -5 |
| r11 | 0.485497 | 8.11643×10 -3 | 1.22055×10 -3 | 9.10820×10 -5 | 0.00000 |
| r12 | 2.305489 | 1.65619×10 -3 | -5.15182×10 -5 | 1.81229×10 -5 | 5.31047×10 -10 |
| r13 | 0.673566 | 3.02771×10 -3 | -1.43149×10 -4 | 3.85349×10 -5 | 7.45157×10 -7 |
The definition of ri in the table 3,4, di, ni, ν i etc. is identical with embodiment 1.
In embodiment 2,, adopted ゼ オ ネ ッ Network ス (registered trademark) E48R as the 1st lens the 1, the 2nd lens the 3, the 4th lens 10 and lens 5.In addition, as prism 2 and the 3rd lens 4, adopted PC (polycarbonate).That is, embodiment 2 related Zoom lens are made of 6 plastic lenss (comprising prism).Here, except that face r3, all planes of refraction all are taken as aspheric surface.
The analog result of the Zoom lens that the embodiment 2 of above-mentioned formation is related, its total system focal distance f (mm) is respectively 3.03 (W)～5.25 (M)～9.09 (T) corresponding to every kind of focal length state (W, M, T).In addition, F counts FNO and is respectively 3.2 (W)～4.6 (M)～5.7 (T) corresponding to every kind of focal length state (W, M, T).Also have, field angle 2 ω are respectively ° (M)～28.7,75.0 ° of (W)～45.3 ° (T) corresponding to every kind of focal length state (W, M, T).
And then, the analog result of the Zoom lens that the embodiment of above-mentioned formation 2 is related, the focal distance f 1 of its 1st lens combination G1 is-6.44mm.The focal distance f 2 of the 2nd lens combination G2 is 7.37mm.At the focal distance f W of the variable multiple lens system integral body of wide-angle side as described above, be 3.03mm.
By above-mentioned analog result as can be known, (value f1/fW) is 2.13.This value satisfies the relation of formula (1).In addition, (value f2/f1) is 1.14 also as can be known.This value satisfies the relation of formula (2).
In addition, the wide visual field angle in that field angle 2 ω of wide-angle side are 75.0 ° becomes multiple proportions (9.09/3.03) and also can guarantee about 3 times.
Having, is the aberration diagram of the related Zoom lens of embodiment 2 shown in Fig. 8,9,10 again.Here, Fig. 8 is the aberration diagram that wide-angle side (W) is located.Fig. 9 is the aberration diagram that middle (M) locates.Figure 10 is the aberration diagram of telescope end (T).In addition, in Fig. 8,9,10, from shown in the left side being spherical aberration diagram, astigmatism figure, distortion aberration diagram respectively.In addition, " FNO " expression F number, " Y " represents maximum image height (mm).
In each aberration diagram, the expression of each data (each solid line and each dotted line etc.) with illustrated at embodiment 1 identical.
In Fig. 8,9,10, each data line approximate convergence is in 0.Hence one can see that, and in the related Zoom lens of embodiment 2, various aberrations have obtained sufficient correction.
Claims (14)
1. Zoom lens begins to have in the following order from the object space side:
The 1st lens combination stationkeeping, that have negative power when becoming times;
The 2nd lens combination position changeable, that have positive light coke when becoming times; And
The 3rd lens combination position changeable, that have positive light coke when becoming times,
This Zoom lens is to carry out above-mentioned change Zoom lens doubly by the interval that changes each lens combination, it is characterized in that,
Above-mentioned the 1st lens combination has been equipped with the 1st lens with negative power; With
Be positioned at the back segment of above-mentioned the 1st lens, have the prism that bends the light path function and have positive light coke,
The Abbe number of above-mentioned the 1st lens is greater than the Abbe number of above-mentioned prism.
2. the Zoom lens of putting down in writing according to claim 1 is characterized in that,
At least one face of above-mentioned the 1st lens is an aspheric surface.
3. the Zoom lens of putting down in writing according to claim 1 is characterized in that,
Above-mentioned the 2nd lens combination has been equipped with the 2nd lens with positive light coke,
At least one face of above-mentioned the 2nd lens is an aspheric surface.
4. the Zoom lens of putting down in writing according to claim 1 is characterized in that,
Formula meets the following conditions:
1.5＜-f1/fW＜4.0 …(1)
Wherein, f1 is the focal length of the 1st lens combination, and fW is the focal length of the variable multiple lens system integral body of wide-angle side.
5. the Zoom lens of putting down in writing according to claim 1 is characterized in that,
Above-mentioned the 2nd lens combination has been equipped with the 2nd lens with positive focal power; With
The 3rd lens that are positioned at the back segment of above-mentioned the 2nd lens and have negative power,
The Abbe number of above-mentioned the 2nd lens is greater than the Abbe number of above-mentioned the 3rd lens.
6. the Zoom lens of putting down in writing according to claim 1 is characterized in that,
The object space side of above-mentioned prism and be curved surface as square side.
7. the Zoom lens of putting down in writing according to claim 1 is characterized in that:
The object space side of above-mentioned prism and be the plane as a certain side in the square side.
8. the Zoom lens of putting down in writing according to claim 1 is characterized in that,
Above-mentioned the 1st lens combination further has been equipped with the back segment that is positioned at above-mentioned prism and has had the 4th lens of negative power,
The Abbe number of above-mentioned the 4th lens is greater than the Abbe number of above-mentioned prism.
9. the Zoom lens of putting down in writing according to claim 1 is characterized in that,
Each lens and the above-mentioned prism that constitute the said lens group are plastic products.
10. the Zoom lens of putting down in writing according to claim 1 is characterized in that,
Above-mentioned the 1st lens and above-mentioned prism are plastic products,
The Abbe number of above-mentioned the 1st lens is more than or equal to 49,
The Abbe number of above-mentioned prism is less than 35.
11. the Zoom lens according to claim 5 is put down in writing is characterized in that,
Above-mentioned the 2nd lens and above-mentioned the 3rd lens are plastic products,
The Abbe number of above-mentioned the 2nd lens is more than or equal to 49,
The Abbe number of above-mentioned the 3rd lens is less than 35.
12. the Zoom lens of being put down in writing is characterized in that according to Claim 8,
Above-mentioned the 4th lens are plastic products,
The Abbe number of above-mentioned the 4th lens is more than or equal to 49,
13. the Zoom lens according to claim 1 is put down in writing is characterized in that:
Each said lens and prism that each said lens group is possessed have aspheric surface respectively.
14. the Zoom lens according to claim 1 is put down in writing is characterized in that,
Formula meets the following conditions:
1.0＜-f2/f1＜2.0 …(2)
Wherein, f1 is the focal length of the 1st lens combination, and f2 is the focal length of the 2nd lens combination.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004306447A JP2006119324A (en) | 2004-10-21 | 2004-10-21 | Zoom lens |
| JP2004306447 | 2004-10-21 |
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| Publication Number | Publication Date |
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| CN1763580A true CN1763580A (en) | 2006-04-26 |
| CN100354683C CN100354683C (en) | 2007-12-12 |
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| CNB2005100727322A Expired - Fee Related CN100354683C (en) | 2004-10-21 | 2005-05-18 | Focus multiple changing lens |
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| KR (1) | KR100683324B1 (en) |
| CN (1) | CN100354683C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108459402A (en) * | 2018-05-29 | 2018-08-28 | 江苏省捷达科技发展有限公司 | A kind of skin image capture means and application method |
| CN110780422A (en) * | 2019-11-04 | 2020-02-11 | 浙江舜宇光学有限公司 | Optical imaging lens |
| WO2023004794A1 (en) * | 2021-07-30 | 2023-02-02 | Huawei Technologies Co.,Ltd. | Imaging optics and imaging device |
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| JP2007033476A (en) * | 2005-07-22 | 2007-02-08 | Nidec Copal Corp | Zoom lens |
| US7605989B1 (en) * | 2008-07-22 | 2009-10-20 | Angstrom, Inc. | Compact auto-focus image taking lens system with a micromirror array lens and a lens-surfaced prism |
| US9557627B2 (en) * | 2014-03-07 | 2017-01-31 | Apple Inc. | Folded camera lens systems |
| CN109597186A (en) * | 2017-09-30 | 2019-04-09 | 北京小米移动软件有限公司 | Camera module and electronic equipment |
| CN113933958B (en) * | 2020-06-29 | 2023-07-21 | 信泰光学(深圳)有限公司 | Imaging lens |
| CN113514937B (en) * | 2021-05-27 | 2023-11-07 | 江西晶超光学有限公司 | Optical system, camera module and electronic equipment |
| CN115308878A (en) | 2022-03-04 | 2022-11-08 | 马颖鏖 | Wide-angle lens |
| CN115343833B (en) * | 2022-08-30 | 2024-10-15 | 舜宇光学(中山)有限公司 | Zoom lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4217415B2 (en) * | 2001-04-04 | 2009-02-04 | オリンパス株式会社 | Electronic imaging device |
| JP3862520B2 (en) * | 2001-06-08 | 2006-12-27 | キヤノン株式会社 | Zoom lens and optical apparatus using the same |
| JP2003021783A (en) * | 2001-07-06 | 2003-01-24 | Canon Inc | Zoom lens and optical equipment using the same |
| JP4212291B2 (en) * | 2002-04-10 | 2009-01-21 | オリンパス株式会社 | Zoom lens and electronic imaging apparatus using the same |
| JP2004037700A (en) * | 2002-07-02 | 2004-02-05 | Canon Inc | Zoom lens and optical device having same |
| JP2004037926A (en) * | 2002-07-04 | 2004-02-05 | Minolta Co Ltd | Imaging apparatus |
| JP4103475B2 (en) * | 2002-07-05 | 2008-06-18 | コニカミノルタオプト株式会社 | Imaging lens device |
| JP4281307B2 (en) * | 2002-08-09 | 2009-06-17 | コニカミノルタオプト株式会社 | Zoom lens system and imaging lens device |
| JP2004212737A (en) * | 2003-01-06 | 2004-07-29 | Nidec Copal Corp | Zoom lens |
-
2004
- 2004-10-21 JP JP2004306447A patent/JP2006119324A/en active Pending
-
2005
- 2005-04-11 KR KR1020050029799A patent/KR100683324B1/en not_active IP Right Cessation
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108459402A (en) * | 2018-05-29 | 2018-08-28 | 江苏省捷达科技发展有限公司 | A kind of skin image capture means and application method |
| CN108459402B (en) * | 2018-05-29 | 2023-09-26 | 江苏省捷达科技发展有限公司 | Skin image acquisition device and application method |
| CN110780422A (en) * | 2019-11-04 | 2020-02-11 | 浙江舜宇光学有限公司 | Optical imaging lens |
| WO2023004794A1 (en) * | 2021-07-30 | 2023-02-02 | Huawei Technologies Co.,Ltd. | Imaging optics and imaging device |
Also Published As
| Publication number | Publication date |
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| KR100683324B1 (en) | 2007-02-15 |
| KR20060047157A (en) | 2006-05-18 |
| CN100354683C (en) | 2007-12-12 |
| JP2006119324A (en) | 2006-05-11 |
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