CN1873461A - Camera lens group in four pieces type - Google Patents
Camera lens group in four pieces type Download PDFInfo
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- CN1873461A CN1873461A CN 200510073416 CN200510073416A CN1873461A CN 1873461 A CN1873461 A CN 1873461A CN 200510073416 CN200510073416 CN 200510073416 CN 200510073416 A CN200510073416 A CN 200510073416A CN 1873461 A CN1873461 A CN 1873461A
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Abstract
The invention relates to a four- sheet type video lens group that includes the first lens, the second lens, the third lens and the fourth lens. The first lens is positive refraction power bend moon type lens; the second lens is the positive refraction power bend moon type lens; and the third lens is the positive refraction power bend moon type lens toward object side. The compound focus is f, the first lens focus distance is f1, the second lens focus distance is f2, and the third lens focus distance is f3, thus, it satisfies the conditional expression of 0.75<f1/f<1.25, and 0.5<|f2|/f3<1.1. The invention can ensure capability and decrease error.
Description
Technical field
The present invention relates to the four-piece type photographic lens group that a kind of small image extraction device uses, it is relevant with the single-focus lens group of general small image extraction device, be meant four combinations that lens constituted of utilization especially, and be the brand-new four-piece type photographic lens group design of adopting the configuration of default focal length relation.
Background technology
Because phtographic lens is more and more extensive in the utilization scope in modern times, and along with the continuous growth of consumer electronics industry, market increases day by day to the demand of small image extraction module now; Particularly in the industry of mobile phone camera, computer network camera, or the application of vehicle safety imaging monitoring device etc.; The user promotes again and again to the performance requirement of product, and not only separating the picture quality must be good, and the error of product more will be dwindled.
The photosensory assembly of general digital single-focus lens group is nothing more than being two kinds of CCD or CMOS, and the susceptibility of its sensitization can increase and decay fast with camera lens emergent light angle, and therefore general number is lived the structure that single focus camera lens all adopts 3～4 eyeglasses to form; Commonly use digital single-focus lens and after configuration mode practicality like this, still have following technical difficulties:
One, first lens of existing camera lens module are two to protruding lens, and second lens are then two to the depression lens, and still, two have excessive ability to the depression lens and occur to protruding lens and two, cause that whole to be that system takes place unstable;
They are two years old, first lens of commonly using product are two to protruding lens, second lens then two to the depression lens, and the two is all adopted glass mirror and binds mutually and be made, because the external diameter very little (small-sized camera lens) of first lens, second lens, so bind the degree of difficulty height of operation, and production cost also can raise the reduction that the product yield of commonly using then can be relative.
Therefore, dwindling the camera lens height and can take into account in the research of high resolution, we must find more effective technology, can solve the above problems.In order effectively to solve the aforementioned practical problems of commonly using digital single-focus lens, technology and experience that creator of the present invention was accumulated in the optical device field based on the past, set about from the angle of saving cost, stable performance, finally develop the brand-new pattern that four-piece type photographic lens group of the present invention, and reach and guarantee performance, minimizing error, more can reach the effect of the effect that reduces the image quality deterioration simultaneously.
Summary of the invention
The purpose of this invention is to provide a kind of performance of effectively guaranteeing, reduce the four-piece type photographic lens group of error, first lens of the present invention are the positive refracting power meniscus lens of convex surface towards object side, these second lens are to be the negative refracting power meniscus lens of convex surface towards object side, the 3rd lens then are the positive refracting power meniscus lens of convex surface towards the imaging side, the 4th lens are convex surface positive refracting power meniscus lenses towards object side, be all under the both-sided aspherical relation at second～the 4th lens, the present invention can guarantee each lens performance, reduce error, more can reach the purpose that reduces the image quality deterioration simultaneously.
Second purpose of the present invention provides a kind of four-piece type photographic lens group that reduces production cost and processing difficulties degree, second lens of the present invention, the 3rd lens and the 4th lens all are to adopt plastic material, make more easily, effectively reduce cost, improve the product yield.
The 3rd purpose of the present invention provides a kind of four-piece type photographic lens group of guaranteeing each lens performance, reducing error, the data of each lenses of the present invention all are combined with clear and definite conditional, can bring into play the purpose of guaranteeing each lens performance, reducing error under rigid condition.
As follows for reaching the technical scheme that the foregoing invention purpose adopted: a kind of four-piece type photographic lens group, it is disposed by aperture, first lens, second lens, the 3rd lens and the 4th lens in regular turn from object side and is formed, its structural improvement is: these first lens are the positive refracting power meniscus lens (or plano-convex lens) of convex surface towards object side; These second lens are the negative refracting power meniscus lens of convex surface towards object side, and its two sides is aspheric surface all; The 3rd lens are the positive refracting power meniscus lens of convex surface towards the imaging side, and its two sides is aspheric surface all; The 4th lens are convex surface positive refracting power meniscus lenses towards object side, and its two sides is aspheric surface all.
These first lens are the plano-convex lens of convex surface towards object side.
Synthetic focal length be f, first lens focus distance for f1, second lens focus distance for f2, the 3rd lens focus distance during for f3, the present invention utilizes and satisfies following relation:
0.75＜f1/f＜1.25
0.5＜|f2|/f3＜1.1。
The present invention's second lens, the 3rd lens and the 4th lens all are to adopt plastic material, and the synthetic focal length of second lens, the 3rd lens and the 4th lens will satisfy following formula when being f234:
|f234|/f＜3.0。
In addition, r7 of the present invention is the curvature of face radius of the 4th lens object side, and r8 is the curvature of face radius of the 4th lens imaging side, and the present invention utilizes and satisfies following relation:
8.5＜|r7+r8|/|r7-r8|＜16.0。
Beneficial effect of the present invention is:
1. a kind of performance of effectively guaranteeing provided by the invention, reduce the four-piece type photographic lens group of error, first lens of the present invention are the positive refracting power meniscus lens of convex surface towards object side, these second lens are to be the negative refracting power meniscus lens of convex surface towards object side, the 3rd lens then are the positive refracting power meniscus lens of convex surface towards the imaging side, the 4th lens are convex surface positive refracting power meniscus lenses towards object side, be all under the both-sided aspherical relation at second～the 4th lens, the present invention can guarantee each lens performance, reduce error, more can reach the effect that reduces the image quality deterioration simultaneously;
2. a kind of four-piece type photographic lens group that reduces production cost and processing difficulties degree provided by the invention, second lens of the present invention, the 3rd lens and the 4th lens all are to adopt plastic material, make more easily, effectively reduce cost, improve the product yield;
3. a kind of four-piece type photographic lens group of guaranteeing each lens performance, reducing error provided by the invention, the data of each lenses of the present invention all are combined with clear and definite conditional, can bring into play the effect of guaranteeing each lens performance, reducing error under rigid condition.
Description of drawings
The arrangement plan of Fig. 1 embodiment one each lenses.
The arrangement plan of Fig. 2 embodiment two each lenses.
The arrangement plan of Fig. 3 embodiment three each lenses.
The arrangement plan of Fig. 4 embodiment four each lenses.
The arrangement plan of Fig. 5 embodiment five each lenses.
The arrangement plan of Fig. 6 embodiment six each lenses.
The arrangement plan of Fig. 7 embodiment seven each lenses.
The arrangement plan of Fig. 8 embodiment eight each lenses.
The arrangement plan of Fig. 9 embodiment nine each lenses.
The set of data of Figure 10 embodiment one each lenses is received the difference chart.
The set of data of Figure 11 embodiment two each lenses is received the difference chart.
The set of data of Figure 12 embodiment three each lenses is received the difference chart.
The set of data of Figure 13 embodiment four each lenses is received the difference chart.
The set of data of Figure 14 embodiment five each lenses is received the difference chart.
The set of data of Figure 15 embodiment six each lenses is received the difference chart.
The set of data of Figure 16 embodiment seven each lenses is received the difference chart.
The set of data of Figure 17 embodiment eight each lenses is received the difference chart.
The set of data of Figure 18 embodiment nine each lenses is received the difference chart.
The asphericity coefficient tables of data of each embodiment of Figure 19.
The asphericity coefficient tables of data of each embodiment of Figure 20.
The asphericity coefficient tables of data of each embodiment of Figure 21.
The arrangement numerical value of each embodiment of Figure 22.
The primary clustering symbol description
Aperture 1
The first lens L1
The second lens L2
The 3rd lens L3
The 4th lens L4
Embodiment
Relevant the present invention is the technology of reaching above-mentioned purpose, being adopted, means and other effect, now enumerate several preferred embodiments and cooperate graphic detailed description as after, believe purpose of the present invention, feature and other advantage, when can by one deeply and concrete understanding:
See also the present invention's the first～nine embodiment configuration schematic diagram shown in Fig. 1-9; different numerical value change and the chart of four-piece type photographic lens group embodiment then see also Figure 10-20; the all true gained of testing of the numerical value change of each embodiment of the present invention; both used the product of different numerical value, same structure must belong to protection category of the present invention; be equally applicable to state clearly at this on the portable facility in advance.
The four-piece type photographic lens group structure of first embodiment of the invention to the nine embodiment is as follows, it is disposed by aperture 1, the first lens L1, the second lens L2, the 3rd lens L3 and the 4th lens L4, flat glass 2,3 and imaging surface 4 in regular turn from object side and is formed, wherein:
These first lens L1 is the positive refracting power meniscus lens (or planoconvex lens) of convex surface towards object side;
These second lens L2 is the negative refracting power meniscus lens of convex surface to the both-sided aspherical of object side;
The 3rd lens L3 is the positive refracting power meniscus lens of convex surface to the both-sided aspherical of imaging surface 4;
The 4th lens L4 is the positive refracting power meniscus lens of convex surface to the both-sided aspherical of object side;
Aforementioned system of the present invention promptly is the optical system that is made of 4 pieces of eyeglasses; the function that this flat glass 2 has infrared ray (IR) to filter; disposing parallel flat glass 3 has the function of protection solid-state image pickup sub-prime, has disposed solid-state image pickup sub-primes such as CCD, MOS in addition at imaging surface 4.
The first lens L1 among the embodiment of the invention one～four and the embodiment six～eight is a planoconvex lens; And the first lens L1 of embodiment five, nine is positive refracting power meniscus lens, and these second lens L2, the 3rd lens L3, the 4th lens L4 are all the both-sided aspherical shape, and all are shaped by plastic material.
First face of the first lens L1 among the embodiment of the invention six～eight is an aspherical shape, can be shaped with plastic material, the face shape is arranged and become the eyeglass of distinguishing point about the second lens L2, the 3rd lens L3, the 4th lens L4, but, deciding according to paraxial shape and eyeglass energy is the basis that belongs to positive refracting power meniscus lens or negative refracting power meniscus lens, decides category under positive refracting power meniscus lens of the present invention or the negative refracting power meniscus lens with this.
Figure 10～Figure 21 of the present invention receives the difference chart about the set of data of embodiment one～nine each lenses, and the top of Figure 10～Figure 21 is the code name of the lenses set of data:
The parameter of F NO.～F optical design interval scale brightness.
Draw angle～2 ω.
Focal length～f; F is the synthetic focal length (mm) of photographic lens group, and below 1.2.3.4.5.6.7.8.9.10.11.12 is that the lens face numerical table that object side rises in regular turn shows: face number number 1.2. is that two of the first lens L1, face number number 3.4. are that two of the second lens L2, face number number 5.6. are that two of the 3rd lens L3, face numbers several 7.8 are that two of the 4th lens L4, face number number 9.10.11.12. are two of parallel plane glass 2,3.
Radius-of-curvature～∞ is paraxial expression of going up radius-of-curvature (mm).
Face interval～d is the numerical value (mm) of expression.
Also have, receive difference figure have sphere receive poor, non-check and accept poor, distort the poor expression of receipts; Be which figure is relevant for the data of d line, about the non-difference of checking and accepting is to represent with the related data and M image planes (MEERIDIONAL) related data of S image planes (SAGITTAL), can know from two sides' receipts difference figure, receipts difference of the present invention revisal all is a full experiment, and is no problem in practicality.
Other sees also Figure 19 of the present invention～21, each lenses of the present invention all has aspherical shape, when aspherical shape is represented asphericity coefficient with A.B.C.D., at the displacement X of the optical axis direction of the position of the high H of optical axis, when being the benchmark for vertex of surface, so Xia Mian formula can be set up:
X＝(1/R)H
2/[1+(1-(1+K)(H/R)
2)
1/2+AH
4+BH
6+CH
8+DH
10+EH
12
The asphericity coefficient of each embodiment is shown in Figure 19～21, and R is paraxial radius-of-curvature, and K is the CONICAL coefficient; The souvenir of aspheric E-03 etc. is 10
-3The meaning.
F of the present invention is the synthetic focal length of photographic lens complete set, and f1 is the focal length of the first lens L1, and the present invention satisfies following relation:
0.75 the conditional of＜f1/f＜1.25.
When f1/f≤0.75, (just) ability grow of these first lens L1, sphere are received and poor, non-are checked and accepted the difference deterioration, and the error sensitivity uprises;
When f1/f 〉=1.25, (just) ability of these first lens L1 dies down. and optical full length is long, reach miniaturization and have any problem.
F2 of the present invention is (bearing) focal length of the second lens L2, when f3 is the focal length of the 3rd lens L3, and the present invention's formula that will satisfy condition:
0.5＜|f2|/f3＜1.1。
| f2|/f3≤0.5 o'clock, (just) ability of the 3rd lens L3 dies down, and (just) ability of these first lens L1 increases, and therefore, that has only the second lens L2 (bear) non-ly checks and accepts poor revisal deficiency, and peripheral performance is understood deterioration;
| f2|/f3 〉=1.1 o'clock, the ability grow of these second lens L2 (bearing) and the 3rd lens L3 (just), look is received difference cloth and is crumbled, and the performance degradation of picture central part is very unfavorable to the optical system miniaturization.
In addition, r7 of the present invention is the curvature of face radius of the 4th lens object side, and when r8 was the curvature of face radius of the 4th lens imaging side, the present invention satisfied following relation:
8.5＜|r7+r8|/|r7-r8|/f3＜16.0。
If | r7+r8|/| r7-r8|≤8.5 o'clock, (just) ability of the 4th lens L4 weakens, and quantity of ambient is not easy to guarantee, draws that the angle diminishes, total length is elongated, and allows the incident angle of CCD (solid-state image pickup sub-prime) become big;
When | r7+r8|/| during r7-r8| 〉=16.0, (just) ability of the 4th lens L4 strengthens, and quantity of ambient is guaranteed easily, and allowed the incident angle of CCD (solid-state image pickup sub-prime) diminish, cause the shape bending of lenses periphery excessive, and then make the shape difficult forming of optical lens eyeglass.
What deserves to be mentioned is that the second lens L2 of the present invention, the 3rd lens L3, the 4th lens L4 are all plastic material, when the synthetic focal length of the second lens L2, the 3rd lens L3, the 4th lens L4 was f234, the present invention will satisfy following conditional:
|f234|/f＞3.0。
The present invention adopts plastic material, the easy moulding manufacturing of both-sided aspherical shape of lenses can be provided. but | f234|/f≤3.0 o'clock, if the second lens L2, the 3rd lens L3, the 4th lens L4 are during for the combination of glass lens, it varies with temperature focus and moves and become big.
About the arrangement numerical value of above parameter and each embodiment as shown in figure 22, photographic lens of the present invention has used the positive refracting power meniscus lens of tool, negative refracting power meniscus lens, and the present invention has appropriate allocative abilities, and guarantee the performance of each eyeglass, also have, the present invention uses the aforementioned condition formula can allow the ability of lenses suppress, foozle is reduced, the performance of reaching production upwards promotes, and the image quality of the employed photographic lens of solid-state image pickup sub-prime obtains appropriate peripheral performance, the extreme deterioration of minimizing picture;
On the other hand, the present invention uses plastic material, has the aspheric surface that becomes a little to make shaping easily, and is positive refracting power meniscus lens near the 4th lens L4 of imaging surface, so the incident angle of CCD (imaging surface) is diminished; So optical system of the present invention used four-piece type photographic lens group is the machine that carries that is applicable to mobile phone etc., also can be used for digital camera.
In sum, innovation structure design of the present invention is utilization first lens, second lens, the 3rd lens and the 4th lens constitute, these first lens are the positive refracting power meniscus lens of convex surface towards object side, these second lens are to be the negative refracting power meniscus lens of convex surface towards object side, the 3rd lens then are the positive refracting power meniscus lens of convex surface towards the imaging side, the 4th lens are convex surface positive refracting power meniscus lenses towards object side, at synthetic focal length is f, first lens focus is apart from f1, second lens focus distance is f2, when the 3rd lens focus distance is f3, the present invention utilize satisfy 0.75＜f1/f＜1.25 and 0.5＜| the relation of f2|/f3＜1.1, can effectively guarantee performance, reduce error, more can reach the effect that reduces the image quality deterioration simultaneously.
Claims (7)
1. a four-piece type photographic lens group is characterized in that, it is disposed by aperture, first lens, second lens, the 3rd lens and the 4th lens in regular turn from object side and forms, and its improvement is:
These first lens are the positive refracting power meniscus lens of convex surface towards object side;
These second lens are the negative refracting power meniscus lens of convex surface towards object side, and its two sides is aspheric surface all;
The 3rd lens are the positive refracting power meniscus lens of convex surface towards the imaging side, and its two sides is aspheric surface all;
The 4th lens are convex surface positive refracting power meniscus lenses towards object side, and its two sides is aspheric surface all.
2. four-piece type photographic lens group according to claim 1 is characterized in that: these first lens are the plano-convex lens of convex surface towards object side.
3. four-piece type photographic lens group according to claim 1 and 2, it is characterized in that: it is that f, first lens focus are apart from being f2 for f1, second lens focus distance, when the 3rd lens focus distance is f3, satisfying following condition: 0.75＜f1/f＜1.25 at synthetic focal length.
4. four-piece type photographic lens group according to claim 1 and 2 is characterized in that: its second lens focus distance satisfies following condition for f2, when the 3rd lens focus distance is f3: 0.5＜| f2|/f3＜1.1.
5. four-piece type photographic lens group according to claim 3 is characterized in that: its second lens focus distance satisfies following condition for f2, when the 3rd lens focus distance is f3: 0.5＜| f2|/f3＜1.1.
6. according to claim 1,2 or 5 described four-piece type photographic lens groups, it is characterized in that: its r7 is the curvature of face radius of the 4th lens object side, r8 is the curvature of face radius of the 4th lens imaging side, and the present invention utilizes and satisfies following relation: 8.5＜| r7+r8|/| r7-r8|＜16.0.
7. four-piece type photographic lens group according to claim 1 and 2, it is characterized in that: its second lens, the 3rd lens and the 4th lens all are to adopt plastic material, and when the synthetic focal length of second lens, the 3rd lens and the 4th lens is f234, satisfy following formula: | f234|/f＜3.0.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100734167A CN100478729C (en) | 2005-05-30 | 2005-05-30 | Camera lens group in four pieces type |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100734167A CN100478729C (en) | 2005-05-30 | 2005-05-30 | Camera lens group in four pieces type |
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| CN1873461A true CN1873461A (en) | 2006-12-06 |
| CN100478729C CN100478729C (en) | 2009-04-15 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101470249B (en) * | 2007-12-25 | 2011-02-16 | 大立光电股份有限公司 | Four-piece type optical lens group for imaging |
| CN101738707B (en) * | 2008-11-10 | 2012-07-18 | 大立光电股份有限公司 | Four-lens type photography optical lens group |
| CN101666902B (en) * | 2008-09-05 | 2012-12-05 | 中山联合光电科技有限公司 | Small-distortion, small-volume, high-illumination and high-resolution optical system |
| CN103513398A (en) * | 2012-06-26 | 2014-01-15 | 比亚迪股份有限公司 | Optical imaging lens |
| CN103697822A (en) * | 2013-12-26 | 2014-04-02 | 北京信息科技大学 | Optical path system for optical triangulation probe |
| CN104614844A (en) * | 2015-03-09 | 2015-05-13 | 襄阳锦翔光电科技股份有限公司 | Wide-angle photographic lens |
| CN108398768A (en) * | 2018-05-08 | 2018-08-14 | 浙江舜宇光学有限公司 | Optical imaging system |
| CN115480368A (en) * | 2022-08-22 | 2022-12-16 | 舜宇光学(中山)有限公司 | Sweep a yard camera lens |
-
2005
- 2005-05-30 CN CNB2005100734167A patent/CN100478729C/en active Active
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101470249B (en) * | 2007-12-25 | 2011-02-16 | 大立光电股份有限公司 | Four-piece type optical lens group for imaging |
| CN101666902B (en) * | 2008-09-05 | 2012-12-05 | 中山联合光电科技有限公司 | Small-distortion, small-volume, high-illumination and high-resolution optical system |
| CN101738707B (en) * | 2008-11-10 | 2012-07-18 | 大立光电股份有限公司 | Four-lens type photography optical lens group |
| CN103513398A (en) * | 2012-06-26 | 2014-01-15 | 比亚迪股份有限公司 | Optical imaging lens |
| CN103513398B (en) * | 2012-06-26 | 2016-01-20 | 深圳市比亚迪电子部品件有限公司 | A kind of optical imaging lens |
| CN103697822A (en) * | 2013-12-26 | 2014-04-02 | 北京信息科技大学 | Optical path system for optical triangulation probe |
| CN103697822B (en) * | 2013-12-26 | 2016-09-14 | 北京信息科技大学 | The light path system of optical triangulation gauge head |
| CN104614844A (en) * | 2015-03-09 | 2015-05-13 | 襄阳锦翔光电科技股份有限公司 | Wide-angle photographic lens |
| CN108398768A (en) * | 2018-05-08 | 2018-08-14 | 浙江舜宇光学有限公司 | Optical imaging system |
| WO2019214209A1 (en) * | 2018-05-08 | 2019-11-14 | 浙江舜宇光学有限公司 | Optical imaging system |
| CN108398768B (en) * | 2018-05-08 | 2020-01-07 | 浙江舜宇光学有限公司 | Optical imaging system |
| CN115480368A (en) * | 2022-08-22 | 2022-12-16 | 舜宇光学(中山)有限公司 | Sweep a yard camera lens |
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| CN100478729C (en) | 2009-04-15 |
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