CN114609763B - Miniaturized optical lens, imaging device and portable terminal - Google Patents
Miniaturized optical lens, imaging device and portable terminal Download PDFInfo
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- CN114609763B CN114609763B CN202210178191.5A CN202210178191A CN114609763B CN 114609763 B CN114609763 B CN 114609763B CN 202210178191 A CN202210178191 A CN 202210178191A CN 114609763 B CN114609763 B CN 114609763B
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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
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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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
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
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Abstract
The invention relates to an optical instrument, in particular to a miniaturized optical lens, an imaging device and a portable terminal, which solve the technical problems that the optical lens of the existing miniaturized camera device is difficult to adapt to a larger detector target surface under the condition of small volume and is difficult to have a higher optical modulation transfer function under higher spatial frequency; the miniaturized optical lens comprises a lens diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a focal plane which are coaxially arranged in sequence along the light incidence direction; the focal power ranges of the first lens and the fifth lens are respectively that the absolute value of the focal power is more than 0.002 and less than 0.003; the focal power range of the second lens is more than 0.3 and less than 0.4; the focal power ranges of the third lens and the fourth lens are both more than 0.25 and less than 0.3; the imaging device comprising the miniaturized optical lens has the characteristics of small volume, light weight and large aperture, and is particularly suitable for portable terminal application.
Description
Technical Field
The present invention relates to an optical lens and an optical instrument, and more particularly, to a miniaturized optical lens, an imaging device, and a portable terminal.
Background
With the development of mobile phone, security and automobile imaging technologies, the demand for miniaturized camera devices is increasing. The requirement for miniaturization of an optical lens of an imaging device is generally considered from two aspects, that is, on the one hand, the number of pixels of a detector of the miniaturized imaging device is smaller and smaller, and on the other hand, the number of pixels of the detector of the miniaturized imaging device is larger and larger, so that the optical lens of the miniaturized imaging device needs to have a compatible and larger detector target surface while having a small volume, and has a higher optical modulation transfer function at a higher spatial frequency. However, it is difficult to achieve the above requirements in the current miniaturized optical lens.
Disclosure of Invention
The invention aims to solve the technical problems that an optical lens of the existing miniaturized camera shooting device is difficult to adapt to a larger detector target surface under the condition of small volume and has a higher optical modulation transfer function under higher spatial frequency, and provides a miniaturized optical lens, an imaging device and a portable terminal.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the invention relates to a miniaturized optical lens, which is characterized in that: the lens diaphragm, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the focal plane are coaxially arranged in sequence along the light incidence direction;
the first lens, the second lens, the third lens, the fourth lens and the fifth lens are both double-sided aspheric surfaces, and the diameters of the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all less than or equal to 5mm;
the focal power ranges of the first lens and the fifth lens are respectively that the absolute value of the focal power is more than 0.002 and less than 0.003;
the focal power range of the second lens is more than 0.3 and less than 0.4;
the focal power ranges of the third lens and the fourth lens are respectively that the absolute value of the focal power is more than 0.25 and less than 0.3.
Further, the first aspheric surface of the first lens is a concave surface.
Further, aspheric coefficients of the first lens, the second lens, the third lens, the fourth lens and the fifth lens all satisfy an aspheric formula;
the first surface aspheric surface coefficients of the first lens are respectively A1, B1, C1 and D1, wherein A1, B1, C1 and D1 satisfy the following conditions:
0.015＜A1＜0.02，0.009＜B1＜0.01，-0.004＜C1＜-0.003，0.0008＜D1＜0.0009；
the aspheric coefficients of the second surface of the first lens are a1, b1, c1, d1 and e1 respectively, wherein a1, b1, c1, d1 and e1 satisfy the following conditions:
0.02＜a1＜0.03，0.001＜b1＜0.002，0.0003＜c1＜0.0004，-0.0007＜d1＜-0.0006，0.0002＜e1＜0.0003；
the first aspheric coefficients of the second lens are A2, B2, C2 and D2 respectively, wherein A2, B2, C2 and D2 satisfy the following conditions:
0.0025＜A2＜0.003，-0.002＜B2＜-0.0015，-0.00025＜C2＜-0.002，-0.00025＜D2＜-0.002；
the aspheric coefficients of the second surface of the second lens are a2, b2, c2, d2 and e2, wherein a2, b2, c2, d2 and e2 satisfy the following conditions:
0.003＜a2＜0.0035，-0.0015＜b2＜-0.001，0.00015＜c2＜0.0002，-0.00045＜d2＜-0.0004，4.5×10 -5 ＜e2＜5×10 -5 ；
the aspheric coefficients of the first surface of the third lens are respectively A3, B3, C3 and D3, wherein A3, B3, C3 and D3 satisfy the following conditions:
-0.009＜A3＜-0.008，-0.003＜B3＜-0.0027，0.0006＜C3＜0.0007，7.7×10 -5 ＜D3＜8×10 -5 ；
the aspheric coefficients of the second surface of the third lens are a3, b3, c3, d3 and e3, wherein a3, b3, c3, d3 and e3 satisfy the following conditions:
-0.04＜a3＜-0.035，0.004＜b3＜0.0045，-0.0045＜c3＜-0.004，0.0015＜d3＜0.002，-0.00035＜e3＜-0.0003；
the first aspheric coefficients of the fourth lens are respectively A4, B4, C4 and D4, wherein A4, B4, C4 and D4 satisfy the following conditions:
0.004＜A4＜0.004，0.006＜B4＜0.0065，-0.0015＜C4＜-0.001，7.7×10 -5 ＜D4＜8×10 -5 ；
aspheric coefficients of a4, b4, c4, d4, e4, f4 and g4 of the second surface of the fourth lens are respectively, wherein a4, b4, c4, d4, e4, f4 and g4 satisfy the following conditions:
0.025＜a4＜0.03，-0.001＜b4＜-0.00095，0.002＜c4＜0.0025，-0.00045＜d4＜-0.0004，1.95×10 -5 ＜e4＜2×10 -5 ，-1.45×10 -6 ＜f4＜-1.4×10 -6 ，4.25×10 -7 ＜g4＜4.3×10 -7 ；
the aspheric coefficients of the first surface of the fifth lens are respectively A5, B5 and C5, wherein A5, B5 and C5 satisfy the following conditions:
-0.07＜A＜-0.065，0.02＜B＜0.025，-0.0025＜C＜-0.002；
aspheric coefficients of a4, b4, c4 and d4 of the second surface of the fifth lens are respectively, wherein a4, b4, c4 and d4 satisfy the following conditions:
-0.095＜a4＜-0.09，0.02＜b4＜0.025，-0.003＜c4＜-0.0025，9×10 -5 ＜d4＜9.5×10 -5 。
furthermore, the materials of the first lens and the third lens are both zf series high-refractive-index low-dispersion glass;
the second lens is made of lak series high-refractive-index high-dispersion glass;
the fourth lens is made of zlaf series high-refractive-index high-dispersion glass;
the material of the fifth lens is zf series low-refractive index low-dispersion glass.
Further, the diameter of the first lens is less than or equal to 2.7mm;
the diameters of the second lens, the third lens and the third lens are less than or equal to 3.8mm;
the diameter of the fourth lens is less than or equal to 4.5mm;
the diameter of the fifth lens is less than or equal to 4.8mm.
Further, the diameter of the lens diaphragm is 2mm; the diagonal of the focal plane is 5.64mm.
Further, the distance between the lens diaphragm and the focal plane is 7.6mm; the focal length f is 4.4mm; the relative pore diameter 1/F is 1/2.2.
The invention also provides an imaging device, which is characterized in that: including the miniaturized optical lens described above.
In addition, the invention also provides a portable terminal which is characterized by comprising the imaging device.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
1. the miniaturized optical lens is designed by adopting five double-sided aspheric lenses, the distance between a lens diaphragm and a focal plane is 7.6mm, the diameter of the largest lens in the five double-sided aspheric lenses is phi 5mm, and the size of the focal plane can reach 5.67mm, so that the optical lens is small in size, the weight of the optical lens is estimated to be less than or equal to 0.2g, the focal length is 4.4mm, and the F number is 2.2; meanwhile, the optical modulation transfer function is higher under higher spatial frequency, the optical modulation transfer function of the full field of view is better than 0.3 at the position of 200lp/mm, the distortion of the full field of view is within 5%, the optical modulation transfer function is suitable for detectors below 1/2.84 inches, the resolution can reach more than 200lp/mm, the spherical aberration and astigmatism of the optical lens are better corrected, and the imaging quality is good.
2. The first lens of the miniaturized optical lens is concave to the measured image body, and the front end of the first lens is not easy to collide after being adjusted.
3. The miniaturized optical lens has reasonable structural distribution, no lens interference and easy processing and assembly.
4. The miniaturized optical lens has small volume, light weight and large aperture, and is particularly suitable for application to portable terminals such as mobile phones.
Drawings
FIG. 1 is a schematic diagram of a miniaturized optical lens system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an optical modulation transfer function of a compact optical lens system according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a distortion curve of a compact optical lens according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a spherical aberration curve of a compact optical lens according to an embodiment of the present invention;
fig. 5 is a schematic view of an astigmatic curve of a miniaturized optical lens according to an embodiment of the present invention.
The reference numbers in the figures are:
1-first lens, 2-second lens, 3-third lens, 4-fourth lens, 5-fifth lens, 6-focal plane, 7-lens diaphragm.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative efforts based on the technical solutions of the present invention belong to the protection scope of the present invention.
As shown in fig. 1, a miniaturized optical lens includes a lens stop 7, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, and a focal plane 6 coaxially arranged in sequence along a light incident direction; the lens diaphragm 7 is positioned in front of the first lens 1 and is coaxially arranged with the first lens 1; the focal plane 6 is positioned behind the fifth lens 5 and is arranged coaxially with the fifth lens 5; incident light sequentially passes through the lens diaphragm 7, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4 and the fifth lens 5 to reach the focal plane 6.
The first lens 1, the second lens 2, the third lens 3, the fourth lens 4 and the fifth lens 5 are all double-sided aspheric surfaces, and the types of materials are different.
The lens diaphragm 7 is arranged in front, so that the exposed size of the optical lens and the outer diameter of the lens of the whole optical lens are reduced, and the volume and the weight of the optical lens are effectively reduced. The length between the lens diaphragm 7 and the focal plane 6 is 7.6mm, and the largest diameter of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4 and the fifth lens 5 is phi 5mm. The focal length F of the optical lens is 4.4mm, the F number of the optical lens is 2.2, the distortion of the whole visual field is within 5 percent, the optical lens is suitable for a detector with the size of less than 1/2.84 inches, the resolution can reach more than 200lp/mm, and the estimated weight is less than or equal to 0.2g.
In the embodiment, the aspheric coefficients of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4 and the fifth lens 5 all satisfy the aspheric formula;
the diameter of the first lens 1 is less than or equal to 2.7mm, the material of the first lens 1 is zf series high-refractive-index low-dispersion glass, the focal power is 0.002 < the absolute value of the focal power is < 0.003, the aspheric coefficients of the first surface of the first lens 1 are respectively A1, B1, C1 and D1, wherein A1, B1, C1 and D1 meet the following conditions: 0.015 < A1 < 0.02,0.009 < B1 < 0.01, -0.004 < C1 < -0.003,0.0008 < D1 < 0.0009; the aspheric coefficients of the second surface of the first lens 1 are a1, b1, c1, d1 and e1, wherein a1, b1, c1, d1 and e1 satisfy the following conditions: 0.02 < a1 < 0.03,0.001 < b1 < 0.002,0.0003 < c1 < 0.0004, -0.0007 < d1 < -0.0006,0.0002 < e1 < 0.0003;
the diameter of the second lens 2 is less than or equal to 3.8mm, the material of the second lens 2 is lak series high-refractive-index high-dispersion glass, the focal power is more than 0.3 and less than 0.4, the aspheric coefficients of the first surface of the second lens 2 are respectively A2, B2, C2 and D2, wherein A2, B2, C2 and D2 meet the following conditions: 0.0025 < A2 < 0.003, -0.002 < B2 < -0.0015, -0.00025 < C2 < -0.002, -0.00025 < D2 < -0.002; the aspheric coefficients of the second surface of the second lens 2 are a2, b2, c2, d2 and e2, wherein a2, b2, c2, d2 and e2 satisfy the following conditions: 0.003 < a2 < 0.0035, -0.0015 < b2 < -0.001 >, 0.00015 < c2 < 0.0002, -0.00045 < d2 < -0.0004, 4.5X 10 -5 ＜e2＜5×10 -5 ；
The diameter of the third lens 3 is less than or equal to 3.8mm, the material of the third lens 3 is zf series high-refractive-index low-dispersion glass, the focal power is more than 0.25 and less than 0.3, the first-surface aspheric coefficients of the third lens 3 are respectively A3, B3, C3 and D3, wherein A3, B3, C3 and D3 meet the following conditions: -0.009 < A3 < -0.008, -0.003 < B3 < -0.0027, -0.0006 < C3 < 0.0007, 7.7X 10 -5 ＜D3＜8×10 -5 (ii) a The aspheric coefficients of the second surface of the third lens 3 are a3, b3, c3, d3 and e3, where a3, b3, c3, d3 and e3 satisfy the following conditions: -0.04 < a3 < -0.035,0.004 < b3 < 0.0045, -0.0045 < c3 < -0.004,0.0015 < d3 < 0.002, -0.00035 < e3 < -0.0003;
the diameter of the fourth lens 4 is less than or equal to 4.5mm, the material of the fourth lens 4 is zlaf series high-refractive-index high-dispersion glass, the focal power is more than 0.25 and less than 0.3, the aspheric coefficients of the first surface of the fourth lens 4 are respectively A4, B4, C4 and D4, wherein A4, B4, C4 and D4 meet the following conditions: 0.004 < A4 < 0.004,0.006 < B4 < 0.0065, -0.0015 < C4 < -0.001, 7.7X 10 -5 ＜D4＜8×10 -5 (ii) a The aspheric coefficients of the second surface of the fourth lens element 4Is a4, b4, c4, d4, e4, f4, g4, wherein a4, b4, c4, d4, e4, f4, g4 satisfy the following condition: 0.025 < a4 < 0.03, -0.001 < b4 < -0.00095, < 0.002 < c4 < 0.0025, -0.00045 < d4 < -0.0004, < 1.95 × 10 -5 ＜e4＜2×10 -5 ，-1.45×10 -6 ＜f4＜-1.4×10 -6 ，4.25×10 -7 ＜g4＜4.3×10 -7 ；
The diameter of the fifth lens 5 is less than or equal to 4.8mm, the fifth lens 5 is made of zf series low-refractive-index low-dispersion glass, the focal power is 0.002 < the absolute value of the focal power is < 0.003, and the aspheric coefficients of the first surface of the fifth lens 5 are A5, B5 and C5 respectively, wherein A5, B5 and C5 meet the following conditions: -0.07 < A > -0.065,0.02 < B < 0.025, -0.0025 < C > -0.002; aspheric coefficients of the second surface of the fifth lens 5 are a4, b4, c4 and d4, wherein a4, b4, c4 and d4 satisfy the following conditions: -0.095 < a4 < -0.09,0.02 < b4 < 0.025, -0.003 < c4 < -0.0025, 9X 10 -5 ＜d4＜9.5×10 -5 。
In this embodiment, the aspheric surface of the first lens element 1 is a concave surface, and the diagonal of the focal plane 6 is 5.64mm, which can satisfy the imaging requirements of a camera with a size of 1/2.84 inch or less; the lens stop 7 is located foremost and has a diameter of 2mm.
As shown in FIG. 2, it can be seen from the optical modulation transfer function diagram of the optical lens that the central field optical modulation transfer function can reach 0.65@200lp/mm, and the full field optical modulation transfer function can reach 0.3@200lp/mm, so as to achieve a better imaging effect.
As shown in fig. 3, which is a distortion curve of the optical lens provided by the present invention, it can be seen from the figure that the distortion control is better, and the full field distortion can be controlled within 5%.
As shown in fig. 4 and 5, the spherical aberration curve and the astigmatism curve provided by the present invention show that the lens has better spherical aberration and astigmatism correction.
The miniaturized optical lens can be applied to an imaging device; the imaging device can also be applied to a portable terminal, and the terminal equipment can be detection equipment such as a computer, a notebook, a palm computer, a mobile phone, various cloud servers and the like.
Claims (6)
1. A miniaturized optical lens characterized by: the lens comprises a lens diaphragm (7), a first lens (1), a second lens (2), a third lens (3), a fourth lens (4), a fifth lens (5) and a focal plane (6), which are coaxially arranged in sequence along the incident direction of light;
the first lens (1), the second lens (2), the third lens (3), the fourth lens (4) and the fifth lens (5) are both double-sided aspheric surfaces, and the diameters of the double-sided aspheric surfaces are less than or equal to 5mm;
the focal power ranges of the first lens (1) and the fifth lens (5) are both more than 0.002 and less than 0.003;
the focal power range of the second lens (2) is more than 0.3 and less than 0.4;
the focal power ranges of the third lens (3) and the fourth lens (4) are respectively that the absolute value of the focal power is more than 0.25 and less than 0.3;
the aspheric coefficients of the first lens (1), the second lens (2), the third lens (3), the fourth lens (4) and the fifth lens (5) all satisfy an aspheric formula;
the first surface aspheric surface coefficients of the first lens (1) are respectively A1, B1, C1 and D1, wherein A1, B1, C1 and D1 meet the following conditions:
0.015＜A1＜0.02，0.009＜B1＜0.01，-0.004＜C1＜-0.003，0.0008＜D1＜0.0009；
the aspheric coefficients of the second surface of the first lens (1) are a1, b1, c1, d1 and e1 respectively, wherein a1, b1, c1, d1 and e1 meet the following conditions:
0.02＜a1＜0.03，0.001＜b1＜0.002，0.0003＜c1＜0.0004，-0.0007＜d1＜-0.0006，0.0002＜e1＜0.0003；
the first surface aspheric coefficients of the second lens (2) are respectively A2, B2, C2 and D2, wherein A2, B2, C2 and D2 satisfy the following conditions:
0.0025＜A2＜0.003，-0.002＜B2＜-0.0015，-0.00025＜C2＜-0.002，-0.00025＜D2＜-0.002；
the aspheric coefficients of the second surface of the second lens (2) are a2, b2, c2, d2 and e2 respectively, wherein a2, b2, c2, d2 and e2 satisfy the following conditions:
0.003＜a2＜0.0035，-0.0015＜b2＜-0.001，0.00015＜c2＜0.0002，-0.00045＜d2＜-0.0004，4.5×10 -5 ＜e2＜5×10 -5 ；
the first surface aspheric surface coefficients of the third lens (3) are respectively A3, B3, C3 and D3, wherein A3, B3, C3 and D3 meet the following conditions:
-0.009＜A3＜-0.008，-0.003＜B3＜-0.0027，0.0006＜C3＜0.0007，7.7×10 -5 ＜D3＜8×10 -5 ；
the aspheric coefficients of the second surface of the third lens (3) are a3, b3, c3, d3 and e3, wherein a3, b3, c3, d3 and e3 meet the following conditions:
-0.04＜a3＜-0.035，0.004＜b3＜0.0045，-0.0045＜c3＜-0.004，0.0015＜d3＜0.002，-0.00035＜e3＜-0.0003；
the first surface aspheric surface coefficients of the fourth lens (4) are respectively A4, B4, C4 and D4, wherein A4, B4, C4 and D4 meet the following conditions:
0.004＜A4＜0.004，0.006＜B4＜0.0065，-0.0015＜C4＜-0.001，7.7×10 -5 ＜D4＜8×10 -5 ；
the aspheric coefficients of the second surface of the fourth lens (4) are respectively a4, b4, c4, d4, e4, f4 and g4, wherein a4, b4, c4, d4, e4, f4 and g4 satisfy the following conditions:
0.025＜a4＜0.03，-0.001＜b4＜-0.00095，0.002＜c4＜0.0025，-0.00045＜d4＜-0.0004，1.95×10 -5 ＜e4＜2×10 -5 ，-1.45×10 -6 ＜f4＜-1.4×10 -6 ，4.25×10 -7 ＜g4＜4.3×10 -7 ；
the first surface aspheric coefficients of the fifth lens (5) are respectively A5, B5 and C5, wherein A5, B5 and C5 meet the following conditions:
-0.07＜A＜-0.065，0.02＜B＜0.025，-0.0025＜C＜-0.002；
the aspheric coefficients of the second surface of the fifth lens (5) are a4, b4, c4 and d4 respectively, wherein a4, b4, c4 and d4 meet the following conditions:
-0.095＜a4＜-0.09，0.02＜b4＜0.025，-0.003＜c4＜-0.0025，9×10 -5 ＜d4＜9.5×10 -5 ；
the diameter of the lens diaphragm (7) is 2mm;
the diagonal line of the focal plane (6) is 5.64mm;
the distance between the lens diaphragm (7) and the focal plane (6) is 7.6mm; the focal length f is 4.4mm; the relative pore diameter 1/F is 1/2.2.
2. The miniaturized optical lens of claim 1, wherein: the first aspheric surface of the first lens (1) is a concave surface.
3. The miniaturized optical lens of claim 2, wherein: the materials of the first lens (1) and the third lens (3) are zf series high-refractive-index low-dispersion glass;
the second lens (2) is made of lak series high-refractive-index high-dispersion glass;
the fourth lens (4) is made of zlaf series high-refractive-index high-dispersion glass;
the material of the fifth lens (5) is zf series low-refractive-index low-dispersion glass.
4. The miniaturized optical lens of claim 3, wherein: the diameter of the first lens (1) is less than or equal to 2.7mm;
the diameters of the second lens (2), the third lens (3) and the third lens (3) are less than or equal to 3.8mm;
the diameter of the fourth lens (4) is less than or equal to 4.5mm;
the diameter of the fifth lens (5) is less than or equal to 4.8mm.
5. An image forming apparatus, characterized in that: comprising a miniaturized optical lens according to any one of the claims 1-4.
6. A portable terminal characterized by: comprising an imaging device according to claim 5.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102540409A (en) * | 2010-12-28 | 2012-07-04 | 康达智株式会社 | imaging lens |
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