CN101893750B - Fixed focal lens - Google Patents
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- CN101893750B CN101893750B CN200910141172XA CN200910141172A CN101893750B CN 101893750 B CN101893750 B CN 101893750B CN 200910141172X A CN200910141172X A CN 200910141172XA CN 200910141172 A CN200910141172 A CN 200910141172A CN 101893750 B CN101893750 B CN 101893750B
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- 238000004519 manufacturing process Methods 0.000 description 5
- 239000004973 liquid crystal related substance Substances 0.000 description 4
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Abstract
The invention relates to a fixed focal lens which comprises a first lens group, a second lens group and a third lens group, wherein the first lens group, the second lens group and the third lens group are sequentially arranged from the amplification side to the reducing side, and the diopters thereof are all positive. The first lens group comprises a first lens, a second lens and a third lens which are sequentially arranged from the amplification side to the reducing side, the second lens group comprises a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from the amplification side to the reducing side, the third lens group comprises a seventh lens, and the lens surface of the first lens group in the fixed focal lens near the amplification side is a concave surface. In addition, the distance between the lens surface of the second lens group near the reducing side and the lens surface of the third lens group near the amplification side is L1, the total length of the fixed focal lens is L, and the fixed focal lens also accords with an inequality that 0.1 is smaller than L1/L smaller than 0.5. The fixed focal lens has the advantages of lower cost and better optical characteristics.
Description
[technical field]
The invention relates to a kind of camera lens, particularly about a kind of tight shot (fixed-focuslens).
[background technology]
In recent years, the numerical digit display device, LCD (Liquid Crystal Display for example, LCD), numerical digit micro-display (Digital Light Processing, DLP) with plasma display panel (Plasma Display Panel, PDP) etc. (Cathode RayTube CRT) is the widespread use of display device of new generation institute to replace traditional cathode-ray tube (CRT) gradually.Because digital image signal transmission and handle characteristics such as undistorted and clear are arranged, thus with the numerical digit display device applications at projection display equipment (for example numerical digit rear projection display apparatus) trend of the times especially.Yet there are many challenges in the tight shot that is applied to projection display equipment to optical designers.
For example, general projection display equipment is in order to reach good image quality, and its tight shot has characteristics such as low distortion aberration, high-res, high-contrast and uniform picture illumination usually.In addition, these high-quality projection display equipments preferably can also have bigger field angle except having good image quality, to satisfy the demand of the big picture of little space projectable.In addition, for the utilization factor that promotes light source and the homogeneity of projected picture illumination, in the chief ray of the reduced side of tight shot and its optical axis to heal near parallel better, that is to say that the chief ray of its reduced side will be healed better little with respect to the heart far away angle (telecentric angle) of optical axis.
Yet, general known tight shot for the chief ray that satisfies its reduced side and optical axis near parallel condition, the length that can increase tight shot on the contrary with and the size of eyeglass, and can't reach the purpose of shortening lens length.Moreover, in order to reduce the distortion aberration of tight shot, can pin down the number that it uses lens, and can limit the field angle of its imaging, to such an extent as to projection display equipment can't satisfy the demand of the big picture of little space projectable.In addition, known tight shot generally all can adopt non-spherical lens (aspheric lens) to revise aberration, reaches characteristics such as low distortion aberration, high-res, high-contrast and uniform picture illumination.Yet difficult manufacturing of non-spherical lens and cost are higher, and these all can make the cost of tight shot be difficult to reduce.
[summary of the invention]
The invention provides a kind of tight shot, it has lower cost and better optical characteristics concurrently.
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 all purposes or other purposes, the present invention proposes a kind of tight shot, and it comprises one first lens group, one second lens group and one the 3rd lens group.First lens group is disposed between a Zoom Side and the reduced side, and has positive diopter.First lens group comprises one first lens, one second lens and one the 3rd lens of arranging in regular turn toward reduced side from the Zoom Side.Wherein, first lens are the lens of close Zoom Side in the tight shot, and the first surface towards the Zoom Side of first lens is a concave surface.Second lens group is disposed between first lens group and the reduced side, and has positive diopter.Second lens group comprises one the 4th lens, one the 5th lens and one the 6th lens of arranging in regular turn toward reduced side from the Zoom Side.The 3rd lens group is disposed between second lens group and the reduced side, and has positive diopter.The 3rd lens group comprises one the 7th lens.Wherein, in second lens group the lens surface of close reduced side be a second surface, in the 3rd lens group the lens surface of close Zoom Side be one the 3rd surface.The length overall of tight shot is L, and the distance on second surface to the three surfaces is L
1, and tight shot meets 0.1＜L
1/ L＜0.5.
Described tight shot of the present invention, the effective focal length of tight shot are f, and the effective focal length of first lens group is f
1, and tight shot meets 0.3＜f
1/ f＜0.9.The effective focal length of tight shot is f, and the effective focal length of the 3rd lens group is f
3, and tight shot can meet 0.8＜f
3/ f＜2.The radius-of-curvature towards the surface of reduced side of the 4th lens is R, and the effective focal length of tight shot is f, and tight shot can meet 0.2＜R/f＜1.The 3rd lens towards the Zoom Side and the surface of reduced side be respectively one the 4th the surface and one the 5th surface, the surface towards the Zoom Side of the 4th lens is one the 6th surface, the surface towards reduced side of the 5th lens is one the 7th surface, and the distance on six surfaces, the 5th surface to the is L
2, the distance on seven surfaces, the 4th surface to the is L
3, and tight shot can meet 0.2＜L
2/ L
3＜0.5.
Described tight shot of the present invention, first lens group are a barrel distortion type lens group, and second lens group is a pincushion distortion type lens group.
Described tight shot of the present invention, the diopter of first lens, second lens and the 3rd lens for example are negative, positive, just in regular turn.The diopter of the 4th lens, the 5th lens and the 6th lens for example is negative, positive, just in regular turn.The positive diopter of the 7th lens is for example for just.
Described tight shot of the present invention, tight shot more comprises an inner full-reflection prism, inner full-reflection prism breasting the 7th lens wherein, and between second lens group and the 3rd lens group.
Based on above-mentioned, tight shot of the present invention adopts seven spherical lenses can revise aberration, reaches good image quality, therefore has lower cost and better optical characteristics.In addition, the lens of close Zoom Side in tight shot, its surface towards the Zoom Side is a concave surface, can increase the field angle of camera lens.
For above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and cooperate appended graphic being described in detail below.
[description of drawings]
Fig. 1 is the structural representation of the tight shot of one embodiment of the invention.
Fig. 2 A to Fig. 2 C is the image optics simulated data figure of the tight shot 100 of Fig. 1.
Fig. 3 is the structural representation of the tight shot of another embodiment of the present invention.
60: image processing element, light valve
70: glass cover
100,300: tight shot
110,310: the first lens groups
120,320: the second lens groups
130,330: the three lens groups, the 7th lens
112,312: the first lens
114,314: the second lens
116,316: the three lens
122,322: the four lens
124,324: the five lens
126,326: the six lens
340: inner full-reflection prism
350: aperture diaphragm
A: optical axis
S1 ~ S19: surface
L, L
1~ L
3: spacing
[embodiment]
About aforementioned and other technology contents, characteristics and effect of the present invention, in the following detailed description that cooperates with reference to a graphic preferred embodiment, can clearly present.The direction term of being mentioned in following examples, for example " on ", D score, " preceding ", " back ", " left side ", " right side " etc., only be direction with reference to annexed drawings.Therefore, the direction term of use is to be used for explanation, but not is used for limiting the present invention.
Fig. 1 is the structural representation of the tight shot of one embodiment of the invention.Please refer to Fig. 1, the tight shot 100 of present embodiment is disposed between a Zoom Side and the reduced side, and comprises one first lens group 110, one second lens group 120 and one the 3rd lens group of arranging in regular turn toward reduced side from the Zoom Side 130.In the present embodiment, the diopter of first lens group 110, second lens group 120 and the 3rd lens group 130 just is all.
Specifically, first lens group 110 comprises from the Zoom Side one first lens 112, one second lens 114 and one the 3rd lens of arranging in regular turn toward reduced side 116, and its diopter for example is negative, positive, just in regular turn.Second lens group 120 comprises from the Zoom Side one the 4th lens 122, one the 5th lens 124 and one the 6th lens of arranging in regular turn toward reduced side 126, and its diopter for example is negative, positive, just in regular turn.At this, the 3rd lens group 130 is made up of one the 7th lens 130, and its diopter is for example for just.Particularly, in the present embodiment, first lens 112 are a biconcave lens, second lens 114 and the 3rd lens 116 respectively are a biconvex lens, the 4th lens 122 are a biconcave lens, the 5th lens 124 are the concave-convex lens of a convex surface towards reduced side, and the 6th lens 126 are the concave-convex lens of a convex surface towards the Zoom Side, and the 7th lens 130 are the plano-convex lens of a convex surface towards reduced side.In addition, in the present embodiment, seven lens forming tight shot 100 are all spherical lens.
Generally speaking, reduced side can be provided with an image processing element 60 (image processingdevice).In the present embodiment, image processing element 60 for example is light valve (light valve), and light valve for example is a numerical digit micro-mirror element (digital micro-mirror device, DMD), a silica-based liquid crystal panel (liquid-crystal-on-silicon panel, LCOS panel) or a penetration liquid crystal panel (transmissive liquid crystal panel, transmissive LCD).In addition, in the present embodiment, the video imaging that tight shot 100 is suitable for image processing element 60 is provided is in the Zoom Side.
In the present embodiment, first lens 112 are the lens of close Zoom Side in the tight shot 100, and the surperficial S1 towards the Zoom Side of first lens 112 is a concave surface, to reach the purpose that increases field angle.Thus, can avoid in order to keep wide viewing angle and to revise aberration, and cause the radius-of-curvature of surperficial S5 of the surperficial S4 of second lens 114 and the 3rd lens 116 too little, increase the degree of difficulty that eyeglass is made.In addition, in order to ensure the optical imagery quality, can make tight shot 100 satisfy following condition one in the present embodiment:
0.3＜f
1/ f＜0.9 (condition one)
Wherein f is the effective focal length of tight shot 100, f
1It is the effective focal length of first lens group 110.In addition, surperficial S1 is that concave surface can cause the image barrel distortion, and the radius-of-curvature of surperficial S1 is more little, causes the degree of image barrel distortion big more.Therefore, in order to reduce the degree of image barrel distortion, in the present embodiment, second lens group 120 is designed to pincushion distortion type lens group, to compensate 110 pairs of barrel distortion that image was produced of first lens group.In view of the above, in the present embodiment, tight shot 100 can satisfy following condition two:
＜R/f＜0.1 0.2 (condition two)
Wherein R is the radius-of-curvature of the surperficial S8 of the 4th lens 122.By condition two as can be known, if on behalf of 122 pairs of pincushion distortions that image produced of the 4th lens, R/f＞0.1 then be not enough to compensate 110 pairs of barrel distortion that image produced of first lens group.On the contrary, if R/f＜0.2, the image barrel distortion overcompensation of then representing the 4th lens 122 to be produced for first lens group 110.So, will cause the surperficial S7 of the 4th lens 122 must produce the effect that bigger barrel distortion remedies overcompensation, and cause complicated " off-axis aberration " (off-axis aberration) to produce.Hence one can see that, and for keeping good image quality, tight shot 100 can satisfy condition two.In addition, in the present embodiment, tight shot 100 still can satisfy following condition three:
0.2＜L
2/ L
3＜0.5 (condition three)
L wherein
2Be axial distance (i.e. distance on the optical axis A of tight shot 100) by the surperficial S7 of surperficial S6 to the four lens 122 of the 3rd lens 116, and L
3Be axial distance by the surperficial S10 of surperficial S5 to the five lens 124 of the 3rd lens 116.By condition three as can be known, if L
2/ L
3＜0.2, then represent the 4th lens 122 near the 3rd lens 116, and distance the 5th lens 122 are far away.Because therefore the 4th lens 122 behind the light beam surperficial S6 bigger by radius-of-curvature, promptly enter the 4th lens 122 near the 3rd lens 116.So light beam is after passing through the 4th lens 122, its suffered flexion degree is less, so that the light beam that needs the 5th lens 124 of large-size to receive from the 4th lens 122, and then make that the 6th lens 126 also must increased in size.Thus, the lens of large-size can increase the cost of manufacture of camera lens, have also run counter to the principle of small designization.In addition, light beam is less by the suffered flexion degree in the 4th lens 122 back, also can make distance between second lens group 120 and the 3rd lens group 130, can't satisfy the tight shot 100 required distance of focusing.On the contrary, if L
2/ L
3＞0.5, then represent the 4th lens 122 near the 5th lens 124, and distance the 3rd lens 116 are far away.So, the 4th lens 122 need bigger refracting power, the light beam that passes through with flexion, and bigger refracting power can cause bigger aberration.Hence one can see that, and for keeping good image quality, tight shot 100 can satisfy condition three.
In the present embodiment, first lens group 110 and second lens group 120 relative position to each other remain unchanged, and the relative tight shot 100 in the position of the 3rd lens group 130 is fixed.First lens group 110 can be focused by moving relative to the 3rd lens group with second lens group 120.Therefore, the distance between second lens group 120 and the 3rd lens group 130 is preferable too not little, so tight shot 100 still can satisfy following condition four:
0.1＜L
1/ L＜0.5 (condition four)
Wherein, L
1Be axial distance, and L is the length overall of tight shot 100, that is is by the surperficial S1 of first lens 112 axial distance to the surperficial S17 of light valve 60 by the surperficial S13 of surperficial S12 to the seven lens 130 of the 6th lens 126.By condition four as can be known, if L
1/ L＞0.5 then can cause the length overall of tight shot 100 oversize, can't reach the purpose of miniaturization.On the contrary, if L
1/ L＜0.1 can make that then the spacing of second lens group 120 and the 3rd lens group 130 is too little, so that can't satisfy the required distance of tight shot 100 focusings.Hence one can see that, and for reaching the purpose of system's miniaturization, tight shot 100 can satisfy condition four.In addition, in the present embodiment, in order to make near the chief ray of tight shot 100 reduced side and optical axis A approaching parallel, promptly be similar to telecentric mirror head (telecentric lens), the 3rd lens group 130 of tight shot 100 can be designed to positive diopter, and tight shot 100 can satisfy following condition five:
0.8＜f
3/ f＜2 (condition five)
F wherein
3It is the effective focal length of the 3rd lens group 130.If f
3The refracting power deficiency of the 3rd lens group 130 is then represented in/f＜0.8 so that near the chief ray of tight shot 100 reduced side can't with optical axis A near parallel.So, if will achieve the above object, then can increase the size of the 6th lens 126, increase the cost of manufacture of camera lens.If f
3/ f＞2 then represent the radius-of-curvature of surperficial S14 of the 7th lens too little, can increase the degree of difficulty that camera lens is made.Therefore, for the cost of manufacture and the degree of difficulty that reduce camera lens, tight shot 100 can satisfy condition five.What deserves to be mentioned is that in the present embodiment, comprise an aperture diaphragm (not illustrating) between first lens group 110 and second lens group 120, it is positioned on the surperficial S6 of the 3rd lens 116.
Following content will be enumerated an embodiment of tight shot 100.Be noted that, listed data information is not in order to limit the present invention in the following table one, have in the technical field under any and know that usually the knowledgeable is after reference the present invention, when using principle of the present invention its parameter or setting are done suitable change, precisely because must belong in the category of the present invention.
(table)
In Table 1, spacing is meant the air line distance on optical axis A between two adjacent surfaces, for instance, the spacing of surperficial S3, promptly surperficial S3 is to the air line distance on optical axis A between surperficial S4.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 114 on the surface, surface S5, S6 are two surfaces of the 3rd lens 116, and surperficial S7, S8 are two surfaces of the 4th lens 122, and surperficial S9, S10 are two surfaces of the 5th lens 124, surface S11, S12 are two surfaces of the 6th lens 126, and surperficial S13, S14 are two surfaces of the 7th lens 130.S15, S16 one are used for two surfaces of the glass cover (coverglass) 70 of light valve 60 on the surface.
Relevant for parameter values such as each surperficial radius-of-curvature, spacings, please refer to table one, no longer repeat at this.
Fig. 2 A to Fig. 2 C is the image optics simulated data figure of the tight shot 100 of Fig. 1.Please refer to figure Fig. 2 A to Fig. 2 C, wherein Fig. 2 A is modulation transfer function curve map (modulation transferfunction, MTF), its transverse axis be weekly the phase/spatial frequency (spatialfrequency in cycles per millimeter) of millimeter (mm), the longitudinal axis is the modulus (modulus of the OTF) of optics transfer function.In Fig. 2 A the simulated data figure that the light (being respectively 460nm, 527nm, 615nm) with three kinds of different wave lengths is done.In addition, be the curvature of field (field curvature) from left to right in regular turn among Fig. 2 B and the figure of distortion (distortion), and be to be that the light of 527nm simulates out with the wavelength.Fig. 2 C is lateral chromatic aberration figure (lateral color), and is the simulated data figure that the light (being respectively 460nm, 527nm, 615nm) with three kinds of different wave lengths is done.Because the shown figure that goes out of Fig. 2 A to Fig. 2 C is all in the scope of standard, so the tight shot 100 of present embodiment has good image quality.
In table two, list some analog parameter value of tight shot 100 respectively, comprise effective focal length (EFL), field angle, heart angle far away, and tight shot 100 simulation value to condition five that satisfies condition.
(table two)
Project numerical value
Effective focal length 17.2722
Field angle 34.78 degree
Heart angle far away 2 degree
f
1/f 0.543
R/f 0.444
L
2/L
3 0.390
L
1/L 0.326
f
3/f 1.375
In the present embodiment, first lens group 110 is a barrel distortion type lens group, and second lens group 120 is pincushion distortion type lens group.After light beam is passing through first lens group 110, can produce the image of barrel distortion, but after the compensation through second lens group 120, the image of barrel distortion just can be corrected for there are not distortion or the less image of distortion level.Thus, in tight shot 100, the collocation of first lens group 110 and second lens group 120 is formed, and can eliminate the aberration of optical imagery.In addition, the 3rd lens group 130 is a positive diopter, can make near the chief ray tight shot 100 reduced sides approaching parallel with optical axis A.Therefore, tight shot 100 has advantages such as the less and distortion degree of the aberration of imaging is lower concurrently.Moreover tight shot 100 uses spherical lens fully, can reduce the cost of product, and has good optical qualities.In addition, the relative tight shot 100 in the position of the 3rd lens group 130 is fixed, and it can move relative to the 3rd lens group 130 with second lens group 120 by first lens group 110 and focus
Fig. 3 is the structural representation of the tight shot of another embodiment of the present invention.Please refer to Fig. 3, the tight shot 300 of present embodiment is similar to tight shot 100, and only topmost between the two difference is that tight shot 300 more comprises an inner full-reflection prism 340, and it is bearing on the 7th lens 330.In the present embodiment, inner full-reflection prism 340 is to utilize the mode of gluing together to be bonded in the surperficial S15 of the 7th lens 330.In the present embodiment, tight shot 300 is suitable for being applied in the projection arrangement, and the 7th lens can be considered as the part of illuminator and imaging system simultaneously, volume that so just can the reduced projection device.What deserves to be mentioned is that in the present embodiment, the 6th lens 326 are a biconvex lens, and comprise an aperture diaphragm 350 between first lens group 310 and second lens group 320.
Following content will be enumerated an embodiment of tight shot 300.Be noted that, listed data information is not in order to limit the present invention in the following table three, have in the technical field under any and know that usually the knowledgeable is after reference the present invention, when using principle of the present invention its parameter or setting are done suitable change, precisely because must belong in the category of the present invention.
(table three)
In table three, S1, S2 are two surfaces of first lens 312 on the surface, S3, S4 are two surfaces of second lens 314 on the surface, S5, S6 are two surfaces of the 3rd lens 316 on the surface, surface S7 is an aperture diaphragm 350, S8, S9 are two surfaces of the 4th lens 322 on the surface, S10, S11 are two surfaces of the 5th lens 324 on the surface, S12, S13 are two surfaces of the 6th lens 326 on the surface, surface S14, S15 are two surfaces of inner full-reflection prism 340, and surperficial S15 is the surface that inner full-reflection prism 340 links to each other with the 7th lens 330.Surface S17, S18 are two surfaces of the glass cover (coverglass) 70 that is used for light valve 60.
Relevant for parameter values such as each surperficial radius-of-curvature, spacings, please refer to table one, no longer repeat at this.
In table four, list some analog parameter value of tight shot 300 respectively, comprise effective focal length (EFL), field angle, heart angle far away, and tight shot 300 simulation value to condition five that satisfies condition.
(table four)
Project numerical value
Effective focal length 14.7934
Field angle 37.78 degree
Heart angle far away 3 degree
f
1/f 0.576
R/f 0.5969
L
2/L
3 0.3889
L
1/L 0.3201
f
3/f 1.6052
In sum, the tight shot of embodiments of the invention uses spherical lens fully, and does not have the employing aspheric mirror, has the advantage of low cost of manufacture.Secondly, the framework of tight shot can effectively be eliminated aberration, aberration and distortion, has good image quality.Moreover, the lens of close Zoom Side in tight shot, its surface towards the Zoom Side is a concave surface, can increase the field angle of camera lens.In addition, tight shot can move relative to the 3rd lens group with second lens group by first lens group and focus, and utilizes the 3rd lens group to make near chief ray of tight shot reduced side and optical axis approaching parallel.At last, when tight shot is applied to projection arrangement, can comprise an inner full-reflection prism, and make that the 7th lens are the part of illuminator and imaging system simultaneously, with the volume of reduced projection device.Therefore, the tight shot that embodiments of the invention provide, it has lower cost and better optical characteristics concurrently.
The above, it only is preferred embodiment of the present invention, when not limiting scope of the invention process with this, promptly the simple equivalent of being done according to the present patent application claim and invention description content generally 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 reached the disclosed whole purposes of the present invention or advantage or characteristics.In addition, summary part and title only are the usefulness that is used for assisting the patent document search, are not to be used for limiting interest field of the present invention.
Claims (10)
1. tight shot comprises:
One first lens group, be disposed between a Zoom Side and the reduced side, has positive diopter, and comprise one first lens, one second lens and one the 3rd lens arranged in regular turn toward this reduced side from this Zoom Side, wherein these first lens are the lens of close this Zoom Side in this tight shot, and the first surface towards this Zoom Side of these first lens is a concave surface;
One second lens group, be disposed between this first lens group and this reduced side, has positive diopter, and comprise from this Zoom Side one the 4th lens, one the 5th lens and one the 6th lens arranged in regular turn toward this reduced side, wherein in this second lens group the lens surface of close this reduced side be a second surface; And
One the 3rd lens group is disposed between this second lens group and this reduced side, has positive diopter, and comprises one the 7th lens, wherein in the 3rd lens group the lens surface of close this Zoom Side be one the 3rd surface,
Wherein, the length overall of this tight shot is L, and this second surface to the distance on the 3rd surface is L
1, this tight shot meets 0.1＜L
1/ L＜0.5.
2. tight shot as claimed in claim 1 is characterized in that: the effective focal length of this tight shot is f, and the effective focal length of this first lens group is f
1, this tight shot meets 0.3＜f
1/ f＜0.9.
3. tight shot as claimed in claim 1 is characterized in that: the effective focal length of this tight shot is f, and the effective focal length of the 3rd lens group is f
3, this tight shot meets 0.8＜f
3/ f＜2.
4. tight shot as claimed in claim 1 is characterized in that: this first lens group is a barrel distortion type lens group, and this second lens group is a pincushion distortion type lens group.
5. tight shot as claimed in claim 1 is characterized in that: the radius-of-curvature towards the surface of this reduced side of the 4th lens is R, and the effective focal length of this tight shot is f, and this tight shot meets 0.2＜R/f＜1.
6. tight shot as claimed in claim 1, it is characterized in that: the surface towards this Zoom Side and this reduced side of the 3rd lens is respectively one the 4th surface and one the 5th surface, the surface towards this Zoom Side of the 4th lens is one the 6th surface, the surface towards this reduced side of the 5th lens is one the 7th surface, and the distance on the 5th surface to the 6th surface is L
2, the distance on the 4th surface to the 7th surface is L
3, this tight shot meets 0.2＜L
2/ L
3＜0.5.
7. tight shot as claimed in claim 1 is characterized in that: the diopter of these first lens, these second lens and the 3rd lens is in regular turn for negative, positive, just.
8. tight shot as claimed in claim 1 is characterized in that: the diopter of the 4th lens, the 5th lens and the 6th lens is in regular turn for negative, positive, just.
9. tight shot as claimed in claim 1 is characterized in that: the 7th lens have positive diopter.
10. tight shot as claimed in claim 1 is characterized in that: also comprise an inner full-reflection prism, and these inner full-reflection prism breasting the 7th lens wherein, and between this second lens group and the 3rd lens group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910141172XA CN101893750B (en) | 2009-05-20 | 2009-05-20 | Fixed focal lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910141172XA CN101893750B (en) | 2009-05-20 | 2009-05-20 | Fixed focal lens |
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| Publication Number | Publication Date |
|---|---|
| CN101893750A CN101893750A (en) | 2010-11-24 |
| CN101893750B true CN101893750B (en) | 2011-10-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI452329B (en) * | 2012-08-30 | 2014-09-11 | Largan Precision Co Ltd | Optical image capturing lens assembly |
| CN105425363B (en) * | 2015-12-24 | 2018-01-12 | 瑞声声学科技(苏州)有限公司 | Photographic optical system |
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| CN101893750A (en) | 2010-11-24 |
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