CN114647060B - imaging lens - Google Patents
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- CN114647060B CN114647060B CN202011516284.1A CN202011516284A CN114647060B CN 114647060 B CN114647060 B CN 114647060B CN 202011516284 A CN202011516284 A CN 202011516284A CN 114647060 B CN114647060 B CN 114647060B
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- lens
- surface facing
- imaging
- refractive power
- object side
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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
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
Abstract
An imaging lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens. The first lens has refractive power and includes a convex surface facing the object side. The second lens has positive refractive power. The third lens has a negative refractive power. The fourth lens has positive refractive power. The fifth lens has positive refractive power. The sixth lens has positive refractive power. The seventh lens has a negative refractive power. The eighth lens has refractive power and comprises a convex surface facing the image side. The ninth lens has refractive power and comprises a convex surface facing the object side. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens are sequentially arranged from an object side to an image side along an optical axis.
Description
Technical Field
The invention relates to an imaging lens.
Background
In addition to the continuous trend toward miniaturization, the present imaging lens has to have a small field of view, a large aperture, and a high resolution, and the known imaging lens cannot meet the present requirements, and another imaging lens with a new architecture is required to meet the requirements of miniaturization, small field of view, large aperture, and high resolution.
Disclosure of Invention
The invention aims to solve the technical problem that the imaging lens in the prior art cannot simultaneously meet the defects of small view field, large aperture and high resolution, and provides an imaging lens which has the advantages of short total length, small view field, small aperture value and high resolution, but still has good optical performance.
The invention provides an imaging lens which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens. The first lens has refractive power and includes a convex surface facing the object side. The second lens has positive refractive power. The third lens has a negative refractive power. The fourth lens has positive refractive power. The fifth lens has positive refractive power. The sixth lens has positive refractive power. The seventh lens has a negative refractive power. The eighth lens has refractive power and comprises a convex surface facing the image side. The ninth lens has refractive power and comprises a convex surface facing the object side. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens are sequentially arranged from an object side to an image side along an optical axis.
The first lens element may have a negative refractive power, and may further include a concave surface facing the image side, the eighth lens element may have a positive refractive power, and may further include another convex surface facing the object side, and the ninth lens element may have a positive refractive power, and may further include another convex surface facing the image side.
The second lens element is a meniscus lens element with a convex surface facing the object side and a concave surface facing the image side, the fourth lens element is a biconvex lens element with a convex surface facing the object side and another convex surface facing the image side, the fifth lens element is a biconvex lens element with a convex surface facing the object side and another convex surface facing the image side, and the sixth lens element is a biconvex lens element with a convex surface facing the object side and another convex surface facing the image side.
The third lens element is a biconcave lens element, comprising a concave surface facing the object side and a concave surface facing the image side, and the seventh lens element is a biconcave lens element, comprising a concave surface facing the object side and a concave surface facing the image side.
The imaging lens of the invention can further comprise an aperture, and the aperture is arranged between the fourth lens and the fifth lens.
Wherein the imaging lens satisfies the following conditions: TTL/f is more than or equal to 3.0 and less than or equal to 3.8; wherein TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, and f is the effective focal length of the imaging lens.
Wherein the imaging lens satisfies the following conditions: f/f is 0.65-0 5 Less than or equal to 0.8; wherein f is the effective focal length of the imaging lens, f 5 Is the effective focal length of the fifth lens.
Wherein the imaging lens satisfies the following conditions: TTL/R of 2.7.ltoreq. 11 Less than or equal to 3.0; wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, R 11 Is the radius of curvature of the object side of the first lens.
Wherein the imaging lens satisfies the following conditions: f is more than or equal to 1.15 34 /f 67 Less than or equal to 1.80; wherein f 34 Is effective for the combination of the third lens and the fourth lensFocal length f 67 The effective focal length is the combination of the sixth lens and the seventh lens.
Wherein the imaging lens satisfies any one of the following conditions: vd (Vd) 2 <30；Vd 4 >35; wherein Vd is 2 Abbe coefficient, vd, of the second lens 4 The abbe coefficient of the fourth lens.
The imaging lens provided by the invention has the following beneficial effects: the lens has the advantages of short total length, small field of view, small aperture value and high resolution, but still has good optical performance.
Drawings
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Fig. 1 is a schematic view of a lens arrangement of a first embodiment of an imaging lens according to the present invention.
Fig. 2A is a longitudinal aberration (Longitudinal Aberration) diagram of the first embodiment of the imaging lens according to the present invention.
FIG. 2B is a Field Curvature (Field) diagram of a first embodiment of an imaging lens according to the present invention.
Fig. 2C is a Distortion (displacement) diagram of the first embodiment of the imaging lens according to the present invention.
Fig. 2D is a Lateral Color (latex Color) chart of the first embodiment of the imaging lens according to the present invention.
Fig. 2E is a diagram of a modulation transfer function (Modulation Transfer Function) of a first embodiment of an imaging lens according to the present invention.
Fig. 3 is a lens arrangement diagram of a second embodiment of an imaging lens according to the present invention.
Fig. 4A is a longitudinal aberration diagram of a second embodiment of an imaging lens according to the present invention.
Fig. 4B is a field curvature diagram of a second embodiment of an imaging lens according to the present invention.
Fig. 4C is a distortion chart of a second embodiment of an imaging lens according to the present invention.
Fig. 4D is a lateral color chart of a second embodiment of an imaging lens according to the present invention.
Fig. 4E is a modulation transfer function diagram of a second embodiment of an imaging lens according to the present invention.
Fig. 5 is a lens arrangement diagram of a third embodiment of an imaging lens according to the present invention.
Fig. 6A is a longitudinal aberration diagram of a third embodiment of an imaging lens according to the present invention.
Fig. 6B is a field curvature diagram of a third embodiment of an imaging lens according to the present invention.
Fig. 6C is a distortion chart of a third embodiment of an imaging lens according to the present invention.
Fig. 6D is a lateral color chart of a third embodiment of an imaging lens according to the present invention.
Fig. 6E is a modulation transfer function diagram of a third embodiment of an imaging lens according to the present invention.
Detailed Description
The present invention provides an imaging lens including: the first lens has refractive power and comprises a convex surface facing the object side; the second lens has a positive refractive power; the third lens has a negative refractive power; the fourth lens has positive refractive power; the fifth lens has positive refractive power; the sixth lens has positive refractive power; the seventh lens has a negative refractive power; the eighth lens has refractive power, and the eighth lens comprises a convex surface facing the image side; and a ninth lens having refractive power, the ninth lens comprising a convex surface facing the object side; the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens are sequentially arranged from an object side to an image side along the optical axis.
Please refer to the following table one, table three and table five, wherein the table one, table three and table five are the related parameter tables of the lenses of the first embodiment to the third embodiment of the imaging lens according to the present invention respectively.
Fig. 1, 3 and 5 are schematic lens arrangements of a first embodiment, a second embodiment and a third embodiment of the imaging lens assembly of the present invention, wherein the first lenses L11, L21 and L31 are meniscus lenses with negative refractive power, the object-side surfaces S11, S21 and S31 are convex surfaces, the image-side surfaces S12, S22 and S32 are concave surfaces, and the object-side surfaces S11, S21 and S31 and the image-side surfaces S12, S22 and S32 are spherical surfaces.
The second lenses L12, L22, L32 are meniscus lenses with positive refractive power, and are made of glass material, the object side surfaces S13, S23, S33 are convex surfaces, the image side surfaces S14, S24, S34 are concave surfaces, and the object side surfaces S13, S23, S33 and the image side surfaces S14, S24, S34 are spherical surfaces.
The third lenses L13, L23, L33 are biconcave lenses with negative refractive power, and are made of glass material, the object-side surfaces S15, S25, S35 are concave surfaces, the image-side surfaces S16, S26, S36 are concave surfaces, and the object-side surfaces S15, S25, S35 and the image-side surfaces S16, S26, S36 are spherical surfaces.
The fourth lenses L14, L24, L34 are biconvex lenses having positive refractive power, and are made of glass material, the object side surfaces S17, S27, S37 are convex surfaces, the image side surfaces S18, S28, S38 are convex surfaces, and the object side surfaces S17, S27, S37 and the image side surfaces S18, S28, S38 are spherical surfaces.
The fifth lenses L15, L25, L35 are biconvex lenses having positive refractive power, and are made of glass material, the object-side surfaces S110, S210, S310 are convex surfaces, the image-side surfaces S111, S211, S311 are convex surfaces, and the object-side surfaces S110, S210, S310 and the image-side surfaces S111, S211, S311 are spherical surfaces.
The sixth lenses L16, L26, L36 are biconvex lenses having positive refractive power, and are made of glass material, wherein the object-side surfaces S112, S212, S312 are convex surfaces, the image-side surfaces S113, S213, S313 are convex surfaces, and the object-side surfaces S112, S212, S312 and the image-side surfaces S113, S213, S313 are spherical surfaces.
The seventh lenses L17, L27, and L37 are biconcave lenses with negative refractive power, and are made of glass material, and the object-side surfaces S114, S214, and S314 are concave surfaces, the image-side surfaces S115, S215, and S315 are concave surfaces, and the object-side surfaces S114, S214, and S314 and the image-side surfaces S115, S215, and S315 are spherical surfaces.
The eighth lenses L18, L28, L38 are biconvex lenses with positive refractive power, and are made of glass material, the object-side surfaces S116, S216, S316 are convex, the image-side surfaces S117, S217, S317 are convex, and the object-side surfaces S116, S216, S316 and the image-side surfaces S117, S217, S317 are spherical surfaces.
The ninth lenses L19, L29, L39 are biconvex lenses having positive refractive power, and are made of glass material, wherein the object side surfaces S118, S218, S318 are convex surfaces, the image side surfaces S119, S219, S319 are convex surfaces, and the object side surfaces S118, S218, S318 and the image side surfaces S119, S219, S319 are spherical surfaces.
In addition, the imaging lenses 1, 2, 3 satisfy at least one of the following conditions:
3.0≤TTL/f≤3.8； (1)
0.65≤f/f 5 ≤0.8； (2)
2.7≤TTL/R 11 ≤3.0； (3)
1.15≤f 34 /f 67 ≤1.80； (4)
Vd 2 <30； (5)
Vd 4 >35； (6)
wherein TTL is the distance between the object sides S11, S21, S31 of the first lenses L11, L21, L31 and the imaging surfaces IMA1, IMA2, IMA3 on the optical axes OA1, OA2, OA3, respectively, f is the effective focal length of the imaging lenses 1, 2, 3 in the first to third embodiments, f 5 In the first to third embodiments, the effective focal length of the fifth lenses L15, L25, L35, f 34 In the first to third embodiments, the combined effective focal lengths of the third lenses L13, L23, L33 and the fourth lenses L14, L24, L34, f 67 In the first to third embodiments, the sixth lenses L16, L26, L36 and the seventh lenses L17, L27, L37 respectively have combined effective focal lengths, R 11 In the first to third embodiments, the radii of curvature, vd, of the object-side surfaces S11, S21, S31 of the first lenses L11, L21, L31 2 In the first to third embodiments, the Abbe coefficients, vd, of the second lenses L12, L22, L32 4 The abbe coefficients of the fourth lenses L14, L24, L34 in the first to third embodiments. So that the imaging lenses 1, 2 and 3 can effectively shorten the lensesTotal length, effective aperture value reduction, effective resolution improvement, effective aberration correction, and effective chromatic aberration correction.
A first embodiment of the imaging lens of the present invention will now be described in detail. Referring to fig. 1, the imaging lens 1 includes, in order from an object side to an image side along an optical axis OA1, a first lens L11, a second lens L12, a third lens L13, a fourth lens L14, an aperture stop ST1, a fifth lens L15, a sixth lens L16, a seventh lens L17, an eighth lens L18, a ninth lens L19, an optical filter OF1 and a cover glass CG1. In imaging, light from the object side is finally imaged on the imaging plane IMA 1. According to the first to eleventh paragraphs [ detailed description ], wherein:
the object side surface S120 and the image side surface S121 OF the optical filter OF1 are both plane surfaces; the object side surface S122 and the image side surface S123 of the protective glass CG1 are both plane surfaces;
by utilizing the lens, the aperture ST1 and the design at least meeting one of the conditions (1) to (6), the imaging lens 1 can effectively shorten the total length of the lens, effectively reduce the aperture value, effectively improve the resolution, effectively correct the aberration and effectively correct the chromatic aberration.
Table one is a table of relevant parameters for each lens of the imaging lens 1 in fig. 1.
List one
The second table is the related parameter values of the imaging lens 1 of the first embodiment and the calculated values corresponding to the conditions (1) to (6), and it can be seen from the second table that the imaging lens 1 of the first embodiment can meet the requirements of the conditions (1) to (6).
Watch II
| f 34 | -62.71mm | f 67 | -38.15mm | ||
| TTL/f | 3.61 | f/f 5 | 0.69 | TTL/R 11 | 2.97 |
| f 34 /f 67 | 1.64 | Vd 2 | 20.88 | Vd 4 | 40.87 |
In addition, the optical performance of the imaging lens 1 of the first embodiment can also meet the requirement, and as can be seen from fig. 2A, the imaging lens 1 of the first embodiment has a longitudinal aberration between-0.01 mm and 0.03 mm. As can be seen from fig. 2B, the imaging lens 1 of the first embodiment has a curvature of field between-0.02 mm and 0.03 mm. As can be seen from fig. 2C, the imaging lens 1 of the first embodiment has a distortion between-8% and 0%. As can be seen from fig. 2D, the imaging lens 1 of the first embodiment has a lateral chromatic aberration between-0.5 μm and 2.5 μm. As can be seen from fig. 2E, the modulation transfer function value of the imaging lens 1 of the first embodiment is between 0.52 and 1.0.
It is apparent that the longitudinal aberration, curvature of field, distortion, and lateral chromatic aberration of the imaging lens 1 of the first embodiment can be effectively corrected, and the resolution of the lens can also meet the requirements, thereby obtaining better optical performance.
Referring to fig. 3, the imaging lens 2 includes, in order from an object side to an image side along an optical axis OA2, a first lens L21, a second lens L22, a third lens L23, a fourth lens L24, an aperture stop ST2, a fifth lens L25, a sixth lens L26, a seventh lens L27, an eighth lens L28, a ninth lens L29, an optical filter OF2, and a cover glass CG2. In imaging, light from the object side is finally imaged on the imaging plane IMA 2. According to the first to eleventh paragraphs [ detailed description ], wherein:
the object side surface S220 and the image side surface S221 OF the optical filter OF2 are plane surfaces; the object side surface S222 and the image side surface S223 of the protecting glass CG2 are both plane surfaces;
by utilizing the lens, the aperture ST2 and the design at least meeting one of the conditions (1) to (6), the imaging lens 2 can effectively shorten the total length of the lens, effectively reduce the aperture value, effectively improve the resolution, effectively correct the aberration and effectively correct the chromatic aberration.
Table three is a table of relevant parameters for each lens of the imaging lens 2 in fig. 3.
Watch III
Table four shows the relevant parameter values of the imaging lens 2 of the second embodiment and the calculated values corresponding to the conditions (1) to (6), and it can be seen from the table four that the imaging lens 2 of the second embodiment can meet the requirements of the conditions (1) to (6).
Table four
| f 34 | -48.93mm | f 67 | -41.38mm | ||
| TTL/f | 3.09 | f/f 5 | 0.80 | TTL/R 11 | 2.95 |
| f 34 /f 67 | 1.18 | Vd 2 | 20.88 | Vd 4 | 40.87 |
In addition, the optical performance of the imaging lens 2 of the second embodiment can also meet the requirement, and as can be seen from fig. 4A, the imaging lens 2 of the second embodiment has a longitudinal aberration between-0.02 mm and 0.03 mm. As can be seen from fig. 4B, the imaging lens 2 of the second embodiment has a curvature of field between-0.02 mm and 0.03 mm. As can be seen from fig. 4C, the imaging lens 2 of the second embodiment has a distortion between-6% and 0%. As can be seen from fig. 4D, the imaging lens 2 of the second embodiment has a lateral chromatic aberration between 0 μm and 3.0 μm. As can be seen from fig. 4E, the modulation conversion function value of the imaging lens 2 of the second embodiment is between 0.56 and 1.0. .
It is apparent that the longitudinal aberration, curvature of field, distortion, and lateral chromatic aberration of the imaging lens 2 of the second embodiment can be effectively corrected, and the resolution of the lens can also meet the requirements, thereby obtaining better optical performance.
Referring to fig. 5, the imaging lens 3 includes, in order from an object side to an image side along an optical axis OA3, a first lens L31, a second lens L32, a third lens L33, a fourth lens L34, an aperture stop ST3, a fifth lens L35, a sixth lens L36, a seventh lens L37, an eighth lens L38, a ninth lens L39, an optical filter OF3, and a cover glass CG3. In imaging, light from the object side is finally imaged on the imaging plane IMA 3. According to the first to eleventh paragraphs [ detailed description ], wherein:
the object side surface S320 and the image side surface S321 OF the optical filter OF3 are both plane surfaces; the object side surface S322 and the image side surface S323 of the protecting glass CG3 are plane surfaces;
by utilizing the lens, the aperture ST3 and the design at least meeting one of the conditions (1) to (6), the imaging lens 3 can effectively shorten the total length of the lens, effectively reduce the aperture value, effectively improve the resolution, effectively correct the aberration and effectively correct the chromatic aberration.
Table five is a table of relevant parameters for each lens of the imaging lens 3 in fig. 5.
TABLE five
The sixth table is the relevant parameter values of the imaging lens 3 of the third embodiment and the calculated values corresponding to the conditions (1) to (6), and it is known from the sixth table that the imaging lens 3 of the third embodiment can meet the requirements of the conditions (1) to (6).
TABLE six
| f 34 | -62.78mm | f 67 | -34.92mm | ||
| TTL/f | 3.40 | f/f 5 | 0.75 | TTL/R 11 | 2.80 |
| f 34 /f 67 | 1.80 | Vd 2 | 20.88 | Vd 4 | 40.87 |
In addition, the optical performance of the imaging lens 3 of the third embodiment can also meet the requirement, and as can be seen from fig. 6A, the imaging lens 3 of the third embodiment has a longitudinal aberration of between-0.01 mm and 0.03 mm. As can be seen from fig. 6B, the imaging lens 3 of the third embodiment has a curvature of field of between-0.02 mm and 0.04 mm. As can be seen from fig. 6C, the imaging lens 3 of the third embodiment has a distortion between-6% and 0%. As can be seen from fig. 6D, the imaging lens 3 of the third embodiment has a lateral chromatic aberration of between 0 μm and 2.5 μm. As can be seen from fig. 6E, the imaging lens 3 of the third embodiment has a modulation transfer function value between 0.59 and 1.0.
It is apparent that the longitudinal aberration, curvature of field, distortion, and lateral chromatic aberration of the imaging lens 3 of the third embodiment can be effectively corrected, and the resolution of the lens can also meet the requirements, thereby obtaining better optical performance.
While the present invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention, and the scope of the invention is defined by the appended claims.
Claims (9)
1. An imaging lens, wherein the lens having refractive power has nine lenses in order:
the first lens has negative refractive power and comprises a convex surface facing the object side;
the second lens has a positive refractive power;
the third lens has a negative refractive power;
the fourth lens has positive refractive power;
the fifth lens has positive refractive power;
the sixth lens has positive refractive power;
the seventh lens has a negative refractive power;
the eighth lens has positive refractive power, and the eighth lens comprises a convex surface facing the image side; and
the ninth lens has positive refractive power, and the ninth lens comprises a convex surface facing the object side;
the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element, the seventh lens element, the eighth lens element and the ninth lens element are arranged in order along an optical axis from the object side to the image side;
the imaging lens satisfies at least one of the following conditions:
2.7≤TTL/R 11 ≤3.0；
1.15≤f 34 /f 67 ≤1.80；
TTL is the distance between the object side surface and the imaging surface of the first lens on the optical axis, R 11 For the radius of curvature, f, of the object side surface of the first lens 34 For the combined effective focal length of the third lens and the fourth lens, f 67 An effective focal length is a combination of the sixth lens and the seventh lens.
2. The imaging lens as claimed in claim 1, wherein:
the first lens is a meniscus lens and further comprises a concave surface facing the image side;
the eighth lens is a biconvex lens and further comprises another convex surface facing the object side; and
the ninth lens is a biconvex lens and further comprises another convex surface facing the image side.
3. The imaging lens as claimed in claim 1, wherein the second lens is a meniscus lens and includes a convex surface facing the object side and a concave surface facing the image side.
4. The imaging lens as claimed in claim 1, wherein the third lens is a biconcave lens and includes a concave surface facing the object side and another concave surface facing the image side.
5. The imaging lens as recited in claim 1, wherein,
the fourth lens is a biconvex lens and comprises a convex surface facing the object side and another convex surface facing the image side; and
the fifth lens is a biconvex lens and comprises a convex surface facing the object side and another convex surface facing the image side.
6. The imaging lens as claimed in claim 1, wherein the sixth lens element is a biconvex lens element, and comprises a convex surface facing the object side and another convex surface facing the image side.
7. The imaging lens as claimed in claim 1, wherein the seventh lens is a biconcave lens and includes a concave surface facing the object side and another concave surface facing the image side.
8. The imaging lens as claimed in claim 1, further comprising an aperture stop disposed between the fourth lens element and the fifth lens element.
9. The imaging lens as claimed in any one of claims 1 to 8, wherein the imaging lens satisfies at least one of the following conditions:
3.0≤TTL/f≤3.8；
0.65≤f/f 5 ≤0.8；
Vd 2 <30；
Vd 4 >35；
wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, f is the effective focal length of the imaging lens, f 5 Vd is the effective focal length of the fifth lens 2 For the Abbe coefficient, vd of the second lens 4 The abbe coefficient of the fourth lens.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011516284.1A CN114647060B (en) | 2020-12-21 | 2020-12-21 | imaging lens |
| US17/543,868 US20220187569A1 (en) | 2020-12-16 | 2021-12-07 | Lens Assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011516284.1A CN114647060B (en) | 2020-12-21 | 2020-12-21 | imaging lens |
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| CN114647060B true CN114647060B (en) | 2023-08-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7660048B1 (en) * | 2008-12-18 | 2010-02-09 | ZAO “Impulse” | Wide angle lens with large aperture |
| JP6481331B2 (en) * | 2014-10-31 | 2019-03-13 | コニカミノルタ株式会社 | Macro lens, imaging optical device and digital equipment |
| CN107305276B (en) * | 2016-04-21 | 2020-11-10 | 佳能企业股份有限公司 | Optical lens |
| CN110879458B (en) * | 2018-09-06 | 2022-07-12 | 信泰光学(深圳)有限公司 | Wide-angle lens |
| CN109407281A (en) * | 2018-12-18 | 2019-03-01 | 中山联合光电科技股份有限公司 | A kind of interior optical lens of focusing of monolithic |
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