CN114236765B - Lens unit and electronic equipment - Google Patents
Lens unit and electronic equipment Download PDFInfo
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- CN114236765B CN114236765B CN202111604768.6A CN202111604768A CN114236765B CN 114236765 B CN114236765 B CN 114236765B CN 202111604768 A CN202111604768 A CN 202111604768A CN 114236765 B CN114236765 B CN 114236765B
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- 238000003384 imaging method Methods 0.000 claims abstract description 22
- 101100309712 Arabidopsis thaliana SD11 gene Proteins 0.000 claims abstract description 7
- 230000003287 optical effect Effects 0.000 claims description 29
- 210000001747 pupil Anatomy 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 11
- 230000004075 alteration Effects 0.000 description 17
- 201000009310 astigmatism Diseases 0.000 description 14
- 238000010586 diagram Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 9
- 230000001678 irradiating effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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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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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention discloses a lens unit and electronic equipment, comprising a first lens, a second lens, a third lens and a fourth lens, wherein the first lens is sequentially arranged from an object side to an image side; the first lens element and the second lens element with positive refractive power have convex object-side surfaces at paraxial regions and concave image-side surfaces at paraxial regions; the third lens element with positive refractive power has a convex image-side surface at a paraxial region; the fourth lens element and the sixth lens element with negative refractive power have concave object-side and image-side surfaces at paraxial regions; the fifth lens element with positive refractive power has a convex object-side surface and a convex image-side surface at a paraxial region; the lens unit satisfies the following conditions: SAG11/SD11 is more than 0.25 and less than 0.65; -3.1 < R42/f4 < -1.1. The invention can limit the angle formed between the edge position of the first lens and the tangent line, simultaneously weakens the deflection degree when the light passes through the lens, improves the imaging quality, and is beneficial to maintaining the assembly yield of the lens, thereby being beneficial to realizing the miniaturization of the lens.
Description
Technical Field
The present invention relates to the field of optical lenses, and more particularly, to a lens unit and an electronic device.
Background
In order to enable the electronic device to meet the portable market demand, the lens mounted in the electronic device needs to be further improved toward miniaturization of the volume, and at the same time, the requirement of the user for imaging quality is also increasing, which makes it necessary to improve the imaging quality while achieving miniaturization of the volume.
However, in order to improve the imaging quality, the most mainstream mode nowadays is to increase the number of lenses, and this improvement inevitably increases the volume of the lens, so that the miniaturization of the lens and the improvement of the imaging quality are difficult to be compatible.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a lens unit and electronic equipment, which solve the problem that the miniaturization of the volume and the improvement of imaging quality of the lens in the prior art are difficult to be compatible.
In order to achieve the above object, the present invention provides the following technical solutions:
a lens unit comprises a first lens, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side, wherein each surface from the object side of the first lens to the image side of the sixth lens is an aspheric surface;
the first lens element with positive refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the second lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the third lens element with positive refractive power has a convex image-side surface at a paraxial region;
the fourth lens element with negative refractive power has a concave object-side surface and a concave image-side surface at a paraxial region;
the fifth lens element with positive refractive power has a convex object-side surface and a convex image-side surface at a paraxial region;
the sixth lens element with negative refractive power has a concave object-side surface and a concave image-side surface at a paraxial region;
the lens unit satisfies the following conditions:
0.25＜SAG11/SD11＜0.65；
-3.1＜R42/f4＜-1.1；
wherein SAG11 is a horizontal displacement amount from an intersection point of the image side surface of the first lens element on the optical axis to a position of the maximum effective radius of the object side surface of the first lens element on the optical axis, SD11 is a maximum effective radius of the object side surface of the first lens element, R42 is a radius of curvature of the image side surface of the fourth lens element, and f4 is a focal length of the fourth lens element.
Optionally, the lens unit further satisfies the following condition:
0.30＜SD51/R51＜0.55；
wherein SD51 is the maximum effective radius of the object side surface of the fifth lens, and R51 is the radius of curvature of the object side surface of the fifth lens.
Optionally, the lens unit further satisfies the following condition:
0.1＜Yc62/f＜0.5；
where Yc62 is the vertical distance between the inflection point of the image side of the sixth lens element and the optical axis, and f is the focal length of the lens unit.
Optionally, the lens unit further satisfies the following condition:
4.0＜(f1+f5)/(CT1+CT5)＜5.8；
wherein f1 is the focal length of the first lens, f5 is the focal length of the fifth lens, CT1 is the thickness of the first lens on the optical axis, and CT5 is the thickness of the fifth lens on the optical axis.
Optionally, the lens unit further satisfies the following condition:
0.55＜EPD/D42＜0.75；
where EPD is the entrance pupil diameter of the lens unit, and D42 is the effective diameter of the image side of the fourth lens.
Optionally, the lens unit further satisfies the following condition:
1.4≤∑CT/∑ET≤1.6；
wherein Σct is the pitch of the central optical axes of the lenses, Σet is the edge thickness of the lenses.
Optionally, the lens unit further satisfies the following condition:
0.50＜f/TTL＜1.35；
where f is the focal length of the lens unit, and TTL is the total optical length of the lens unit.
Optionally, the lens unit further satisfies the following condition:
-2.0＜(f4+f2)/f3＜0；
wherein f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens.
Optionally, the lens unit further satisfies the following condition:
2.00＜(n2+n4)/n3＜2.5；
wherein n2 is the maximum refractive index of the second lens, n3 is the maximum refractive index of the third lens, and n4 is the maximum refractive index of the fourth lens.
The invention also provides an electronic device, comprising:
a lens unit for collecting an optical pattern;
an imaging element for converting the optical pattern into an electrical signal;
wherein the lens unit is any one of the lens units described above.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a lens unit and electronic equipment, which are characterized in that the surface types of a first lens to a sixth lens are reasonably regulated, and the lens unit meets specific conditions, so that the edge position of the first lens and the angle formed by a tangent line can be limited, the deflection degree of light rays when passing through the lens is reduced, the imaging quality is improved, the assembly yield of the lens is maintained, and the size miniaturization of the lens is further facilitated.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic view of a lens unit according to a first embodiment of the present invention;
fig. 2 is a graph of astigmatism and distortion of a lens unit according to a first embodiment of the present invention;
FIG. 3 is a graph showing a spherical aberration curve of a lens unit according to a first embodiment of the present invention;
fig. 4 is a schematic diagram of a lens unit according to a second embodiment of the present invention;
fig. 5 is a graph of astigmatism and distortion of a lens unit according to a second embodiment of the present invention, in order from left to right;
FIG. 6 is a graph showing a spherical aberration curve of a lens unit according to a second embodiment of the present invention;
fig. 7 is a schematic view of a lens unit according to a third embodiment of the present invention;
fig. 8 is a graph of astigmatism and distortion of a lens unit according to a third embodiment of the present invention, in order from left to right;
fig. 9 is a spherical aberration diagram of a lens unit according to a third embodiment of the present invention;
fig. 10 is a schematic view showing a lens unit according to a fourth embodiment of the present invention;
fig. 11 is a graph of astigmatism and distortion of a lens unit according to a fourth embodiment of the present invention;
fig. 12 is a spherical aberration diagram of a lens unit according to a fourth embodiment of the present invention;
fig. 13 is a schematic view of a lens unit according to a fifth embodiment of the present invention;
fig. 14 is a graph showing astigmatism and distortion of a lens unit according to a fifth embodiment of the present invention in order from left to right;
FIG. 15 is a graph showing spherical aberration of a lens unit according to a fifth embodiment of the present invention;
fig. 16 is a schematic view showing a lens unit according to a sixth embodiment of the present invention;
fig. 17 is a graph showing astigmatism and distortion of a lens unit according to a sixth embodiment of the present invention in order from left to right;
FIG. 18 is a graph showing spherical aberration of a lens unit according to a sixth embodiment of the present invention;
fig. 19 is a schematic view showing a lens unit according to a seventh embodiment of the present invention;
fig. 20 is a graph showing astigmatism and distortion of a lens unit according to a seventh embodiment of the present invention in order from left to right;
fig. 21 is a spherical aberration diagram of a lens unit according to a seventh embodiment of the present invention.
In the above figures: a first lens: 110. 210, 310, 410, 510, 610, 710; object side face: 111. 211, 311, 411, 511, 611, 711; image side: 112. 212, 312, 412, 512, 612, 712;
a second lens: 120. 220, 320, 420, 520, 620, 720; object side face: 121. 221, 321, 421, 521, 621, 721; image side: 122. 222, 322, 422, 522, 622, 722;
and a third lens: 130. 230, 330, 430, 530, 630, 730; object side face: 131. 231, 331, 431, 531, 631, 731; image side: 132. 232, 332, 432, 532, 632, 732;
fourth lens: 140. 240, 340, 440, 540, 640, 740; object side face: 141. 241, 341, 441, 541, 641, 741; image side: 142. 242, 342, 442, 542, 642, 742;
a fifth lens: 150. 250, 350, 450, 550, 650, 750; object side face: 151. 251, 351, 451, 551, 651, 751; image side: 152. 252, 352, 452, 552, 652, 752;
a sixth lens: 160. 260, 360, 460, 560, 660, 760; object side face: 161. 261, 361, 461, 561, 661, 761; image side: 162. 262, 362, 462, 562, 662, 762;
an infrared filter: 170. 270, 370, 470, 570, 670, 770;
a diaphragm: 101. 201, 301, 401, 501, 601, 701.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only some embodiments of the present invention, not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it will be understood that when one component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.
Furthermore, the terms "long," "short," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship based on that shown in the drawings, for convenience of description of the present invention, and are not intended to indicate or imply that the apparatus or elements referred to must have this particular orientation, operate in a particular orientation configuration, and thus should not be construed as limiting the invention.
The invention provides a lens unit, which comprises a first lens, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side, wherein each surface from the object side of the first lens to the image side of the sixth lens is an aspheric surface.
The first lens element with positive refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the second lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the third lens element with positive refractive power has a convex or concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region;
the fourth lens element with negative refractive power has a concave object-side surface and a concave image-side surface at a paraxial region;
the fifth lens element with positive refractive power has a convex object-side surface and a convex image-side surface at a paraxial region;
the sixth lens element with negative refractive power has a concave object-side surface and a concave image-side surface at a paraxial region.
Specifically, the lens unit satisfies the following conditions: SAG11/SD11 is more than 0.25 and less than 0.65; -3.1 < R42/f4 < -1.1; wherein SAG11 is a horizontal displacement amount from an intersection point of the image side surface of the first lens element on the optical axis to a position of the maximum effective radius of the object side surface of the first lens element on the optical axis, SD11 is a maximum effective radius of the object side surface of the first lens element, R42 is a radius of curvature of the image side surface of the fourth lens element, and f4 is a focal length of the fourth lens element.
By limiting the ratio of the SAG value of the first lens to the maximum effective radius of the object side surface, the angle formed by the edge position of the first lens and the tangent line can be limited, and the assembly yield of the lens can be maintained; meanwhile, the ratio of the curvature radius of the object side surface of the fourth lens to the focal length of the fourth lens is limited, so that the deflection degree of light rays passing through the lens can be weakened, the imaging quality is improved, and the size miniaturization of the lens is facilitated.
Further, the lens unit also satisfies the following conditions: 0.30 < SD51/R51 < 0.55; wherein SD51 is the maximum effective radius of the object side surface of the fifth lens, and R51 is the radius of curvature of the object side surface of the fifth lens. By defining the shape and aperture size of the fifth lens by the aforementioned relational expression, the fifth lens can be made more compact while ensuring the imaging effect.
Further, the lens unit also satisfies the following conditions: yc62/f is more than 0.1 and less than 0.5; where Yc62 is the vertical distance between the inflection point of the image side of the sixth lens element and the optical axis, and f is the focal length of the lens unit. When the lens unit meets the relation, the angle of the off-axis view field light rays entering the lens can be limited, and the receiving efficiency of the lens on the light rays is improved.
Further, the lens unit also satisfies the following conditions: 4.0 < (f1+f5)/(CT 1+CT 5) < 5.8; wherein f1 is the focal length of the first lens, f5 is the focal length of the fifth lens, CT1 is the thickness of the first lens on the optical axis, and CT5 is the thickness of the fifth lens on the optical axis. By restricting the focal lengths and thicknesses of the first lens and the fifth lens within a certain range, it is advantageous to ensure workability of the lens unit, so that the assembly yield of the lens unit can be improved.
Further, the lens unit also satisfies the following conditions: EPD/D42 is less than 0.55 and less than 0.75; where EPD is the entrance pupil diameter of the lens unit, and D42 is the effective diameter of the image side of the fourth lens. The relation can provide a larger entrance pupil to enlarge the aperture, which is beneficial to improving imaging quality while realizing miniaturization of the lens.
Further, the lens unit also satisfies the following conditions: sigma CT/Sigma ET is more than or equal to 1.4 and less than or equal to 1.6; wherein Σct is the pitch of the central optical axes of the lenses, Σet is the edge thickness of the lenses. The edge thickness of each lens and the interval between the lenses are reasonably limited, so that the optical total length of the lenses can be controlled, and the size of the lenses is miniaturized.
Further, the lens unit also satisfies the following conditions: f/TTL is more than 0.50 and less than 1.35; where f is the focal length of the lens unit, and TTL is the total optical length of the lens unit. By enabling the lens unit to meet the above relation, light rays can be better converged on the imaging surface of the lens, so that definition and integrity of images are ensured.
Further, the lens unit also satisfies the following conditions: -2.0 < (f4+f2)/f3 < 0; wherein f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens. The ratio between the sum of the focal lengths of the fourth lens and the second lens and the focal length of the third lens is reasonably controlled by the relational expression, so that the focal power of the lens unit is reasonably distributed, and the positive spherical aberration and the negative spherical aberration of the front group lens and the middle lens are mutually counteracted.
Further, the lens unit also satisfies the following conditions: 2.00 < (n2+n4)/n 3 < 2.5; wherein n2 is the maximum refractive index of the second lens, n3 is the maximum refractive index of the third lens, and n4 is the maximum refractive index of the fourth lens. Since refractive indexes of the second, third and fourth lenses are specified, it is advantageous to achieve ultra-thin lens units while also achieving an effect of correcting aberrations, and to improve imaging quality of the lenses.
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
Example 1
Referring to fig. 1 to 3, fig. 1 is a schematic diagram of a lens unit according to a first embodiment of the invention, fig. 2 is an astigmatism and distortion curve diagram of the lens unit according to the first embodiment of the invention, and fig. 3 is a spherical aberration curve diagram of the lens unit according to the first embodiment of the invention.
The embodiment of the invention provides a lens unit, which includes a first lens element 110, a stop 101, a second lens element 120, a third lens element 130, a fourth lens element 140, a fifth lens element 150 and a sixth lens element 160, which are disposed in order from an object side to an image side, wherein each of surfaces of an object side 111 of the first lens element 110 to an image side 162 of the sixth lens element 160 is aspheric.
The first lens element 110 with positive refractive power has a convex object-side surface 111 at a paraxial region and a concave image-side surface 112 at a paraxial region;
the second lens element 120 with negative refractive power has a convex object-side surface 121 at a paraxial region and a concave image-side surface 122 at a paraxial region;
the third lens element 130 with positive refractive power has a convex object-side surface 131 at a paraxial region and a convex image-side surface 132 at a paraxial region;
the fourth lens element 140 with negative refractive power has a concave object-side surface 141 and a concave image-side surface 142 at a paraxial region;
the fifth lens element 150 with positive refractive power has a convex object-side surface 151 and a convex image-side surface 152 at a paraxial region;
the sixth lens element 160 with negative refractive power has a concave object-side surface 161 and a concave image-side surface 162 at a paraxial region.
In the lens unit, the diaphragm 101 is located between the first lens 110 and the second lens 120, which is beneficial to reducing the front aperture, thereby achieving the effect of reducing the size of the lens unit.
In addition, the lens unit further includes an infrared filter 170, and the infrared filter 170 is disposed between the sixth lens 160 and the imaging surface, and filters out the infrared band light entering the lens by the infrared filter 170, so as to prevent the infrared light from radiating on the photosensitive chip to generate noise.
Please refer to the following tables 1-1, 1-2 and 1-3.
Table 1-1 shows detailed structural data of an embodiment, wherein the unit of curvature radius, thickness and focal length is millimeter, f is focal length of the lens unit, fno is aperture value, EPD is entrance pupil diameter of the lens unit.
Tables 1 to 2 are aspherical coefficient data in the first embodiment, in which k represents the cone coefficients in the aspherical curve equation, and A4, A6, A8, a10, a12, a14 and a16 represent the 4 th, 6, 8, 10, 12, 14 and 16 th order aspherical coefficients of each surface.
Tables 1 to 3 are conditions satisfied by the lens unit in the first embodiment.
In addition, the following tables of the embodiments are schematic diagrams and graphs corresponding to the embodiments, and the definition of data in the tables is the same as that of tables 1-1, 1-2 and 1-3 of the first embodiment, and will not be described herein.
Example two
Referring to fig. 4 to 6, fig. 4 is a schematic diagram of a lens unit according to a second embodiment of the invention, fig. 5 is an astigmatism and distortion curve diagram of the lens unit according to the second embodiment of the invention, and fig. 6 is a spherical aberration curve diagram of the lens unit according to the second embodiment of the invention.
The present invention provides a lens unit, which includes a first lens element 210, a stop 201, a second lens element 220, a third lens element 230, a fourth lens element 240, a fifth lens element 250 and a sixth lens element 260, which are disposed in order from an object side to an image side, wherein each of surfaces of an object side 211 of the first lens element 210 to an image side 262 of the sixth lens element 260 is aspheric.
The first lens element 210 with positive refractive power has a convex object-side surface 211 at a paraxial region and a concave image-side surface 212 at a paraxial region;
the second lens element 220 with negative refractive power has a convex object-side surface 221 at a paraxial region and a concave image-side surface 222 at a paraxial region;
the third lens element 230 with positive refractive power has a convex object-side surface 231 at a paraxial region and a convex image-side surface 232 at a paraxial region;
the fourth lens element 240 with negative refractive power has a concave object-side surface 241 and a concave image-side surface 242 at a paraxial region;
the fifth lens element 250 with positive refractive power has a convex object-side surface 251 and a convex image-side surface 252 at a paraxial region;
the sixth lens element 260 with negative refractive power has a concave object-side surface 261 and a concave image-side surface 262 at a paraxial region.
In the lens unit, the diaphragm 201 is located between the first lens 210 and the second lens 220, which is beneficial to reducing the front aperture, thereby achieving the effect of reducing the size of the lens unit.
In addition, the lens unit further includes an infrared filter 270, and the infrared filter 270 is disposed between the sixth lens 260 and the imaging surface, and filters out the infrared band light entering the lens through the infrared filter 270, so as to prevent the infrared light from irradiating the photosensitive chip to generate noise.
Please refer to the following tables 2-1, 2-2 and 2-3.
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Example III
Referring to fig. 7 to 9, fig. 7 is a schematic diagram of a lens unit according to a third embodiment of the invention, fig. 8 is an astigmatism and distortion curve of the lens unit according to the third embodiment of the invention, and fig. 9 is a spherical aberration curve of the lens unit according to the third embodiment of the invention.
The present invention provides a lens unit, which includes a first lens element 310, a stop 301, a second lens element 320, a third lens element 330, a fourth lens element 340, a fifth lens element 350 and a sixth lens element 360, which are disposed in order from an object side to an image side, wherein each of surfaces from an object side 311 of the first lens element 310 to an image side 362 of the sixth lens element 360 is aspheric.
Wherein the first lens element 310 with positive refractive power has a convex object-side surface 311 at a paraxial region and a concave image-side surface 312 at a paraxial region;
the second lens element 320 with negative refractive power has a convex object-side surface 321 at a paraxial region and a concave image-side surface 322 at a paraxial region;
the third lens element 330 with positive refractive power has a convex object-side surface 331 at a paraxial region and a convex image-side surface 332 at a paraxial region;
the fourth lens element 340 with negative refractive power has a concave object-side surface 341 and a concave image-side surface 342 at a paraxial region;
the fifth lens element 350 with positive refractive power has an object-side surface 351 and an image-side surface 352 being convex at a paraxial region;
the sixth lens element 360 with negative refractive power has a concave object-side surface 361 and a concave image-side surface 362 at a paraxial region.
In the lens unit, the diaphragm 301 is located between the first lens 310 and the second lens 320, which is beneficial to reducing the front aperture, thereby achieving the effect of reducing the size of the lens unit.
In addition, the lens unit further includes an infrared filter 370, and the infrared filter 370 is disposed between the sixth lens element 360 and the imaging surface, and filters out the infrared band light entering the lens by the infrared filter 370, so as to prevent the infrared light from irradiating the photosensitive chip to generate noise.
Please refer to the following tables 3-1, 3-2 and 3-3.
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Example IV
Referring to fig. 10 to 12, fig. 10 is a schematic view of a lens unit according to a fourth embodiment of the invention, fig. 11 is an astigmatism and distortion curve of the lens unit according to the fourth embodiment of the invention, and fig. 12 is a spherical aberration curve of the lens unit according to the fourth embodiment of the invention.
The present invention provides a lens unit, which includes a first lens element 410, a stop 401, a second lens element 420, a third lens element 430, a fourth lens element 440, a fifth lens element 450 and a sixth lens element 460, which are disposed in order from an object side to an image side, wherein each of surfaces of an object side 411 of the first lens element 410 to an image side 462 of the sixth lens element 460 is aspheric.
The first lens element 410 with positive refractive power has a convex object-side surface 411 at a paraxial region and a concave image-side surface 412 at a paraxial region;
the second lens element 420 with negative refractive power has a convex object-side surface 421 at a paraxial region and a concave image-side surface 422 at a paraxial region;
the third lens element 430 with positive refractive power has a concave object-side surface 431 at a paraxial region and a convex image-side surface 432 at a paraxial region;
the fourth lens element 440 with negative refractive power has an object-side surface 441 and an image-side surface 442 being concave at a paraxial region;
the fifth lens element 450 with positive refractive power has a convex object-side surface 451 and a convex image-side surface 452 at a paraxial region;
the sixth lens element 460 with negative refractive power has a concave object-side surface 461 and a concave image-side surface 462 at a paraxial region.
In the lens unit, the diaphragm 401 is located between the first lens 410 and the second lens 420, which is beneficial to reducing the front aperture, thereby achieving the effect of reducing the size of the lens unit.
In addition, the lens unit further includes an infrared filter 470, and the infrared filter 470 is disposed between the sixth lens 460 and the imaging surface, and filters out the infrared band light entering the lens through the infrared filter 470, so as to prevent the infrared light from radiating on the photosensitive chip to generate noise.
Please refer to the following tables 4-1, 4-2 and 4-3.
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Example five
Referring to fig. 13 to 15, fig. 13 is a schematic diagram showing a lens unit according to a fifth embodiment of the invention, fig. 14 is an astigmatism and distortion curve of the lens unit according to the fifth embodiment of the invention, and fig. 15 is a spherical aberration curve of the lens unit according to the fifth embodiment of the invention.
The present invention provides a lens unit, which includes a first lens element 510, a stop 501, a second lens element 520, a third lens element 530, a fourth lens element 540, a fifth lens element 550 and a sixth lens element 560, which are disposed in order from an object side to an image side, wherein each of surfaces of an object side 511 of the first lens element 510 to an image side 562 of the sixth lens element 560 is aspheric.
The first lens element 510 with positive refractive power has a convex object-side surface 511 at a paraxial region and a concave image-side surface 512 at a paraxial region;
the second lens element 520 with negative refractive power has a convex object-side surface 521 at a paraxial region and a concave image-side surface 522 at a paraxial region;
the third lens element 530 with positive refractive power has a convex object-side surface 531 at a paraxial region and a convex image-side surface 532 at a paraxial region;
the fourth lens element 540 with negative refractive power has a concave object-side surface 541 and a concave image-side surface 542 at a paraxial region;
the fifth lens element 550 with positive refractive power has a convex object-side surface 551 and a convex image-side surface 552 at a paraxial region;
the sixth lens element 560 with negative refractive power has a concave object-side surface 561 and a concave image-side surface 562 at a paraxial region.
In the lens unit, the diaphragm 501 is located between the first lens 510 and the second lens 520, which is beneficial to reducing the front aperture, thereby achieving the effect of reducing the size of the lens unit.
In addition, the lens unit further includes an infrared filter 570, and the infrared filter 570 is disposed between the sixth lens element 560 and the imaging surface, and filters out the infrared band light entering the lens by the infrared filter 570, so as to prevent noise generated when the infrared light irradiates the photosensitive chip.
Please refer to the following tables 5-1, 5-2 and 5-3.
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Example six
Referring to fig. 16 to 18, fig. 16 is a schematic diagram showing a lens unit according to a sixth embodiment of the invention, fig. 17 is a graph of astigmatism and distortion of the lens unit according to the sixth embodiment of the invention, and fig. 18 is a graph of spherical aberration of the lens unit according to the sixth embodiment of the invention.
The present invention provides a lens unit, which includes a first lens element 610, a stop 601, a second lens element 620, a third lens element 630, a fourth lens element 640, a fifth lens element 650 and a sixth lens element 660, wherein the surfaces from an object side to an image side of the first lens element 610, and the surfaces from an object side 611 to an image side 662 of the sixth lens element 660 are aspheric.
The first lens element 610 with positive refractive power has a convex object-side surface 611 at a paraxial region and a concave image-side surface 612 at a paraxial region;
the second lens element 620 with negative refractive power has a convex object-side surface 621 at a paraxial region and a concave image-side surface 622 at a paraxial region;
the third lens element 630 with positive refractive power has a convex object-side surface 631 at a paraxial region and a convex image-side surface 632 at a paraxial region;
the fourth lens element 640 with negative refractive power has a concave object-side surface 641 and a concave image-side surface 642 at a paraxial region;
the fifth lens element 650 with positive refractive power has a convex object-side surface 651 and a convex image-side surface 652 at a paraxial region;
the sixth lens element 660 with negative refractive power has a concave object-side surface 661 and a concave image-side surface 662 at a paraxial region.
In the lens unit, the diaphragm 601 is located between the first lens 610 and the second lens 620, which is beneficial to reducing the front aperture, thereby achieving the effect of reducing the size of the lens unit.
In addition, the lens unit further includes an infrared filter 670, and the infrared filter 670 is disposed between the sixth lens 660 and the imaging surface, and infrared band light entering the lens is filtered by the infrared filter 670, so as to prevent noise generated when infrared light irradiates the photosensitive chip.
Please refer to the following tables 6-1, 6-2 and 6-3.
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Example seven
Referring to fig. 19 to 21, fig. 19 is a schematic view showing a lens unit according to a seventh embodiment of the invention, fig. 20 is an astigmatism and distortion curve of the lens unit according to the seventh embodiment of the invention, and fig. 21 is a spherical aberration curve of the lens unit according to the seventh embodiment of the invention.
The present invention provides a lens unit, which includes a first lens element 710, a stop 701, a second lens element 720, a third lens element 730, a fourth lens element 740, a fifth lens element 750 and a sixth lens element 760, wherein each of an object-side surface 711 of the first lens element 710 and an image-side surface 762 of the sixth lens element 760 is aspheric.
The first lens element 710 with positive refractive power has a convex object-side surface 711 at a paraxial region and a concave image-side surface 712 at the paraxial region;
the second lens element 720 with negative refractive power has a convex object-side surface 721 at a paraxial region and a concave image-side surface 722 at a paraxial region;
the third lens element 730 with positive refractive power has a convex object-side surface 731 at a paraxial region and a convex image-side surface 732 at a paraxial region;
the fourth lens element 740 with negative refractive power has a concave object-side surface 741 and a concave image-side surface 742 at a paraxial region;
the fifth lens element 750 with positive refractive power has a convex object-side surface 751 and a convex image-side surface 752 at a paraxial region;
the sixth lens element 760 with negative refractive power has a concave object-side surface 761 and a concave image-side surface 762 at a paraxial region.
In the lens unit, the diaphragm 701 is located between the first lens 710 and the second lens 720, which is beneficial to reducing the front aperture, thereby achieving the effect of reducing the size of the lens unit.
In addition, the lens unit further includes an infrared filter 770, and the infrared filter 770 is disposed between the sixth lens 760 and the imaging plane, and filters out the infrared band light entering the lens through the infrared filter 770, so as to prevent noise generated when the infrared light irradiates the photosensitive chip.
Please refer to the following tables 7-1, 7-2 and 7-3.
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Example eight
The invention also provides an electronic device, comprising: the lens unit is used for collecting the optical pattern and further comprises an imaging element used for converting the optical pattern into an electric signal; wherein the lens unit is the lens unit as in any one of the above embodiments.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The lens unit is characterized in that the lens unit comprises a first lens, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side, wherein each surface from the object side of the first lens to the image side of the sixth lens is an aspheric surface;
the first lens element with positive refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the second lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the third lens element with positive refractive power has a convex image-side surface at a paraxial region;
the fourth lens element with negative refractive power has a concave object-side surface and a concave image-side surface at a paraxial region;
the fifth lens element with positive refractive power has a convex object-side surface and a convex image-side surface at a paraxial region;
the sixth lens element with negative refractive power has a concave object-side surface and a concave image-side surface at a paraxial region;
the lens unit satisfies the following conditions:
0.25＜SAG11/SD11＜0.65；
-3.1＜R42/f4＜-1.1；
wherein SAG11 is the horizontal displacement from the intersection point of the image side surface of the first lens element on the optical axis to the position of the maximum effective radius of the object side surface of the first lens element on the optical axis, SD11 is the maximum effective radius of the object side surface of the first lens element, R42 is the radius of curvature of the image side surface of the fourth lens element, and f4 is the focal length of the fourth lens element;
the lens unit also satisfies the following conditions:
0.55＜EPD/D42＜0.75；
where EPD is the entrance pupil diameter of the lens unit, and D42 is the effective diameter of the image side of the fourth lens.
2. The lens unit according to claim 1, wherein the lens unit further satisfies the following condition:
0.30＜SD51/R51＜0.55；
wherein SD51 is the maximum effective radius of the object side surface of the fifth lens, and R51 is the radius of curvature of the object side surface of the fifth lens.
3. The lens unit according to claim 1, wherein the lens unit further satisfies the following condition:
0.1＜Yc62/f＜0.5；
where Yc62 is the vertical distance between the inflection point of the image side of the sixth lens element and the optical axis, and f is the focal length of the lens unit.
4. The lens unit according to claim 1, wherein the lens unit further satisfies the following condition:
4.0＜(f1+f5)/(CT1+CT5)＜5.8；
wherein f1 is the focal length of the first lens, f5 is the focal length of the fifth lens, CT1 is the thickness of the first lens on the optical axis, and CT5 is the thickness of the fifth lens on the optical axis.
5. The lens unit according to claim 1, wherein the lens unit further satisfies the following condition:
1.4≤∑CT/∑ET≤1.6；
wherein Σct is the pitch of the central optical axes of the lenses, Σet is the edge thickness of the lenses.
6. The lens unit according to claim 1, wherein the lens unit further satisfies the following condition:
0.50＜f/TTL＜1.35；
where f is the focal length of the lens unit, and TTL is the total optical length of the lens unit.
7. The lens unit according to claim 1, wherein the lens unit further satisfies the following condition:
-2.0＜(f4+f2)/f3＜0；
wherein f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens.
8. The lens unit according to claim 1, wherein the lens unit further satisfies the following condition:
2.00＜(n2+n4)/n3＜2.5；
wherein n2 is the refractive index of the second lens, n3 is the refractive index of the third lens, and n4 is the refractive index of the fourth lens.
9. An electronic device, comprising:
a lens unit for collecting an optical pattern;
an imaging element for converting the optical pattern into an electrical signal;
wherein the lens unit is a lens unit according to any one of claims 1 to 8.
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| CN109270665A (en) * | 2018-12-04 | 2019-01-25 | 广东旭业光电科技股份有限公司 | Optical imaging lens and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109270665A (en) * | 2018-12-04 | 2019-01-25 | 广东旭业光电科技股份有限公司 | Optical imaging lens and electronic equipment |
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