CN109239903B - Periscope type image capturing optical lens group - Google Patents
Periscope type image capturing optical lens group Download PDFInfo
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- CN109239903B CN109239903B CN201811147624.0A CN201811147624A CN109239903B CN 109239903 B CN109239903 B CN 109239903B CN 201811147624 A CN201811147624 A CN 201811147624A CN 109239903 B CN109239903 B CN 109239903B
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- optical reflection
- paraxial region
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/02—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors
- G02B23/08—Periscopes
-
- 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
-
- 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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/0065—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having a beam-folding prism or mirror
-
- 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
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/0065—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having a beam-folding prism or mirror
- G02B13/007—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having a beam-folding prism or mirror the beam folding prism having at least one curved surface
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Astronomy & Astrophysics (AREA)
- Lenses (AREA)
Abstract
The invention relates to a periscope type image capturing optical lens assembly, which is technically characterized by sequentially comprising the following components from an object side to an image side: an optical reflection element I for bending the optical path; a first lens element with negative refractive power; a second lens element with positive refractive power; a third lens element with negative refractive power; a fourth lens element with positive refractive power; a fifth lens element with negative refractive power; and an optical reflection element II for bending the light path again; the object side of the first lens is provided with a diaphragm, the light incident surface of the optical reflection element I is a sphere, the optical axes of the lenses coincide, and the light incident surface of the optical reflection element I and the light emergent surface of the optical reflection element II are distributed on two sides of the optical axis of the lenses. The camera can change the direction of the optical axis and provide a large field angle, under the condition of ensuring imaging quality, the camera can effectively subtract the occupied area of the camera in the screen by matching with a mechanical telescopic mechanism on the mobile phone, and the screen occupation ratio of the comprehensive screen is improved.
Description
Technical Field
The invention relates to a periscope type large-field-angle image capturing optical system, in particular to a periscope type image capturing optical lens group formed by combining two optical reflection elements and five imaging lenses, which is suitable for small portable electronic products such as a periscope type smart phone front camera or other periscope type camera devices.
Background
In recent years, along with market demands, mobile phone cameras also show new development trend, besides the requirements of high pixels, large aperture and ultra-thin type, the whole screen of the smart phone is recently on the market, so that the installation space of the lens is narrower, and the application is proposed for adapting to the increasingly narrow installation space of the lens.
Disclosure of Invention
The invention aims to provide the periscope type image capturing optical lens group capable of effectively subtracting the occupied area of a camera in a screen, changing the direction of an optical axis and providing a large field angle, and improving the screen occupation ratio of a comprehensive screen by matching with a mechanical telescopic mechanism on a mobile phone under the condition of ensuring the imaging quality.
The technical scheme of the invention is as follows:
The periscope type image capturing optical lens assembly is characterized by comprising, in order from an object side to an image side: an optical reflection element I for bending the optical path; a first lens element with negative refractive power having a concave object-side surface at a paraxial region; a second lens element with positive refractive power having a convex object-side surface at a paraxial region; a third lens element with negative refractive power having a convex object-side surface at a paraxial region; a fourth lens element with positive refractive power having a convex object-side surface at a paraxial region; a fifth lens element with negative refractive power having a concave image-side surface at a paraxial region; and an optical reflection element II for bending the light path again; the object side of first lens arranges the diaphragm, the light incident surface of optical reflection component I is the sphere, and the optical axis coincidence of each lens, the light incident surface of optical reflection component I and the light exit surface of optical reflection component II distribute in the optical axis both sides of lens, and satisfy following condition:
tan (FOV) >1.73 equation 1;
-10mm < rdyp < -6mm formula 2;
Wherein, FOV is the angle of view, rdyP is the spherical radius of the light incident surface of the optical reflection element I.
The periscope type image capturing optical lens group further meets the following conditions:
0.5< F12/F <2 > equation 3;
wherein F12 is the combined focal length of the first lens and the second lens, and F is the focal length of the periscope type image capturing optical lens assembly.
The periscope type image capturing optical lens group further meets the following conditions:
3< CT4/CT5<7 equation 4;
Wherein, CT4 is the center thickness of the fourth lens and CT5 is the center thickness of the fifth lens.
In the periscope type image capturing optical lens assembly, the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all aspheric plastic lenses with even numbers.
The beneficial effects of the invention are as follows:
The formula 1 shows that the lens angle of view is large enough to meet the requirement of the front camera; the lens can expand the angle of view through the formula 2, and meanwhile, the incident refraction angle of light is not too large, so that the lens is easy to process and reduces the sensitivity; the ratio of the focal power of the first lens and the second lens in the lens can be reasonably distributed through the formula 3, so that the aberration of the system can be controlled, and the imaging quality can be improved; increasing the image height and decreasing the CRA by equation 4 enables the lens to match the high pixel chip.
Therefore, under the condition that the imaging quality is ensured, the lens group realizes the light path bending by utilizing the reflecting optical element so as to achieve the periscope function, and the lens group is matched with a mechanical telescopic mechanism on a mobile phone to effectively subtract the occupied area of a camera in a screen and improve the screen occupation ratio of a comprehensive screen.
Drawings
FIG. 1 is a schematic view showing the structure of a lens assembly according to embodiment 1 of the present invention;
FIG. 2 is an optical path diagram of a lens assembly according to embodiment 1 of the present invention;
FIG. 3 is a longitudinal spherical aberration diagram of a lens assembly of embodiment 1 of the present invention, with longitudinal spherical aberration values on the abscissa and normalized field of view on the ordinate;
FIG. 4 is an astigmatic field curve of the lens assembly of example 1 with field curvature on the abscissa and field angle on the ordinate;
FIG. 5 is an optical distortion curve of the lens assembly of example 1 of the present invention, with the percent distortion on the abscissa and the angle of field of view on the ordinate;
FIG. 6 is a graph of the MTF transfer function of the lens set of example 1 of the present invention;
FIG. 7 is an optical path diagram of a lens group according to embodiment 2 of the present invention;
FIG. 8 is a longitudinal spherical aberration diagram of a lens assembly of embodiment 2 of the invention;
FIG. 9 is an astigmatic field plot of a lens group according to embodiment 2 of the present invention;
FIG. 10 is an optical distortion curve of a lens assembly of example 2 of the present invention;
FIG. 11 is a graph of the MTF transfer function of the lens set of example 2 of the present invention;
FIG. 12 is an optical path diagram of a lens group according to embodiment 3 of the present invention;
FIG. 13 is a longitudinal spherical aberration diagram of a lens assembly of embodiment 3 of the invention;
FIG. 14 is an astigmatic field plot of a lens group according to embodiment 3 of the present invention;
FIG. 15 is an optical distortion curve of a lens assembly of example 3 of the present invention;
fig. 16 is an MTF transfer function curve of the lens group of example 3 of the present invention.
In the figure: p1. a first lens, p2. A second lens, p3. A third lens, p4. A fourth lens, P5. a fifth lens, pm1 an optical reflection element i; PM2 an optical reflective element II; stop, stop;
1. The optical reflection element comprises a light incident surface of an optical reflection element I, a reflection surface of the optical reflection element I, a light emergent surface of the optical reflection element I, an object side surface of the first lens, an image side surface of the first lens, an object side surface of the second lens, an image side surface of the second lens, an object side surface of the third lens, an image side surface of the third lens, an object side surface of the fourth lens, an image side surface of the fourth lens, an object side surface of the fifth lens, an image side surface of the 14, a light incident surface of the optical reflection element II, a reflection surface of the optical reflection element II and a light emergent surface of the optical reflection element II.
Detailed Description
Example 1
As shown in fig. 1, a periscope type image capturing optical lens assembly sequentially includes, from an object side to an image side: an optical reflection element IPM 1 for bending the optical path; a first lens element P1 with negative refractive power having a concave object-side surface at a paraxial region; a second lens element P2 with positive refractive power having a convex object-side surface at a paraxial region; a third lens element P3 with negative refractive power having a convex object-side surface at a paraxial region; a fourth lens element P4 with positive refractive power having a convex object-side surface at a paraxial region; a fifth lens element P5 with negative refractive power having a concave image-side surface at a paraxial region; and an optical reflection element II PM2 for bending the optical path again; the object side of the first lens P1 is provided with a diaphragm, the light incident surface of the optical reflection element PM1 is a spherical surface, the optical axes of the lenses coincide, and the light incident surface of the optical reflection element PM1 and the light emergent surface of the optical reflection element PM2 are distributed on two sides of the optical axis of the lens, and the following conditions are satisfied:
tan (FOV) >1.73 equation 1;
-10mm < rdyp < -6mm formula 2;
0.5< F12/F <2 > equation 3;
3< CT4/CT5<7 equation 4;
Wherein, FOV is angle of view, rdyP is spherical radius of light incident surface of optical reflection element I, F12 is focal length of first lens and second lens, F is focal length of lens group, CT4 is center thickness of fourth lens, CT5 is center thickness of fifth lens.
The first lens P1, the second lens P2, the third lens P3, the fourth lens P4 and the fifth lens P5 all adopt even-order aspheric plastic lenses, and the aspheric coefficients satisfy the following equations:
Z＝cy2/[1+{1－(1+k)c2y2}+1/2]+A4y4+A6y6+A8y8+A10y10+A12y12+A14y14
Wherein: z is the aspherical sagittal height, c is the aspherical paraxial curvature, y is the lens aperture, k is the conic coefficient, A 4 is the 4 th order aspherical coefficient, A 6 is the 6 th order aspherical coefficient, A 8 is the 8 th order aspherical coefficient, A 10 is the 10 th order aspherical coefficient, A 12 is the 12 th order aspherical coefficient, A 14 is the 14 th order aspherical coefficient.
In this embodiment, the included angle between the reflective surfaces of the optical reflective elements ipm 1 and ii PM2 and the optical axis of the lens is 45 °;
the object side surface of the first lens element P1 is concave at a paraxial region, and the image side surface thereof is convex at a paraxial region;
the object side surface and the image side surface of the second lens element P2 are convex at a paraxial region;
The third lens element P3 has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
The fourth lens element P4 has a convex object-side surface and a convex image-side surface at a paraxial region;
the object-side surface and the image-side surface of the fifth lens element P5 are concave at a paraxial region.
The specific design parameters of the lens group are shown in tables 1 and 2:
TABLE 1
TABLE 2
In the present embodiment, when the field angle FOV of the lens group is 62.7 °, tan (FOV) =1.937; the half-image height is 2.4mm,
The spherical radius RdyP of the light incident surface of the optical reflection element I is-8.034 mm;
The first lens and the second lens have a combined focal length F12 of 4.43mm and a lens group focal length F of 4.00mm, and F12/F=1.11;
the focal lengths of the first lens, the second lens, the third lens, the fourth lens and the fifth lens are respectively-16.14 mm, 3.81mm, -7.83mm, 4.30mm and-8.86 mm.
The center thickness CT4 of the fourth lens is 1.13mm, and the center thickness CT5 of the fifth lens is 0.26mm, CT4/CT 5=4.35.
Referring to fig. 1, the lens group has a relatively uniform shape, is convenient for molding and production, has reasonable lens spacing, and is convenient for later structural design;
referring to fig. 3, the longitudinal spherical aberration of the lens group is shown, and the longitudinal spherical aberration is controlled within + -0.02.
Referring to fig. 4, the astigmatic field curvature of the lens group is shown with a control field curvature in the range of + -0.08.
Referring to fig. 5, the optical distortion curves of the lens groups shown, the percent distortion was controlled to be within ±2%.
Referring to fig. 6, the MTF transfer function curve graph (optical transfer function) of the lens group can comprehensively reflect the imaging quality of the system, and the smoother the curve shape, the higher the height relative to the X axis, the better the imaging quality of the system is proved, and the novel lens has higher definition.
Example 2
The lens shapes of the lens group of this example are the same as those of example 1, and specific design parameters are shown in tables 3 and 4:
TABLE 3 Table 3
TABLE 4 Table 4
In this embodiment, the field angle FOV of the lens group reaches 64.3 °, tan (FOV) = 2.078; half image height is 2.4mm;
The spherical radius RdyP of the light incident surface of the optical reflection element I is-9.164 mm;
The first lens and the second lens have a combined focal length F12 of 4.21mm and a lens group focal length F of 3.88mm, and F12/F=1.09;
The focal lengths of the first lens, the second lens, the third lens, the fourth lens and the fifth lens are respectively-20.13 mm, 3.90mm, -5.51mm, 3.99mm and-14.01 mm.
The center thickness CT4 of the fourth lens is 1.141mm, the center thickness CT5 of the fifth lens is 0.26mm, and CT4/CT 5=4.39.
Referring to fig. 8, the longitudinal spherical aberration of the lens group shown is controlled to be within ±0.05.
Referring to fig. 9, the astigmatic field curvature of the lens group is shown with a control field curvature in the range of + -0.1.
Referring to fig. 10, the optical distortion curves of the lens groups shown, the percent distortion was controlled to be within ±2%.
Referring to fig. 11, the MTF transfer function graph (optical transfer function) of the lens group can comprehensively reflect the imaging quality of the system, and the smoother the curve shape, the higher the height relative to the X axis, the better the imaging quality of the system is proved, and the novel lens has higher definition.
Example 3
The lens shapes of the lens group of this example are the same as those of example 1, and specific design parameters are shown in tables 5 and 6:
TABLE 5
TABLE 6
In this embodiment, the field angle FOV of the lens group reaches 64.5 °, tan (FOV) =2.10; half image height is 2.4mm;
the spherical radius RdyP of the light incident surface of the optical reflection element I is-9.755 mm;
the first lens and the second lens have a combined focal length F12 of 4.072mm and a lens group focal length F of 3.865mm, then F12/F= 1.054;
The focal lengths of the first lens, the second lens, the third lens, the fourth lens and the fifth lens are-32.486 mm, 4.115mm, -4.934mm, 3.801mm and-13.430 mm respectively.
The center thickness CT4 of the fourth lens is 1.21mm, the center thickness CT5 of the fifth lens is 0.26mm, and CT4/CT 5= 4.654.
Referring to fig. 13, the longitudinal spherical aberration of the lens group shown is controlled to be within + -0.05.
Referring to fig. 14, the astigmatic field curvature of the lens group is shown with a control field curvature in the range of + -0.2.
Referring to fig. 15, the optical distortion curves of the lens groups shown, the percent distortion was controlled to be within ±2%.
Referring to fig. 16, the MTF transfer function graph (optical transfer function) of the lens group can comprehensively reflect the imaging quality of the system, and the smoother the curve shape, the higher the height relative to the X axis, the better the imaging quality of the system is proved, and the novel lens has higher definition.
Claims (2)
1. The periscope type image capturing optical lens assembly is characterized by sequentially comprising, from an object side to an image side: an optical reflection element I for bending the optical path; a first lens element with negative refractive power having a concave object-side surface at a paraxial region; a second lens element with positive refractive power having a convex object-side surface at a paraxial region; a third lens element with negative refractive power having a convex object-side surface at a paraxial region; a fourth lens element with positive refractive power having a convex object-side surface at a paraxial region; a fifth lens element with negative refractive power having a concave image-side surface at a paraxial region; and an optical reflection element II for bending the light path again; the object side of first lens arranges the diaphragm, the light incident surface of optical reflection component I is the sphere, and the optical axis coincidence of each lens, the light incident surface of optical reflection component I and the light exit surface of optical reflection component II distribute in the optical axis both sides of lens, and satisfy following condition:
tan (FOV) > 1.73 equation 1;
-10 mm < RdyP < -6mm equation 2;
0.5 < F12/F <2 formula 3;
3< CT4/CT5 < 7 equation 4;
Wherein, FOV is the angle of view, rdyP is the sphere radius of the light incident surface of the optical reflection element I; f12 is the combined focal length of the first lens and the second lens, and F is the focal length of the periscope type image capturing optical lens group; CT4 is the center thickness of the fourth lens and CT5 is the center thickness of the fifth lens.
2. The periscope type image capturing optical lens assembly according to claim 1, wherein: the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all even aspherical plastic lenses.
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| CN111399181B (en) * | 2020-04-27 | 2024-12-20 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN114326015B (en) * | 2020-09-30 | 2024-07-16 | 信泰光学(深圳)有限公司 | Lens device |
| CN115701117B (en) * | 2021-07-29 | 2025-09-05 | 华为技术有限公司 | Camera modules and electronic equipment |
| EP4350415A4 (en) * | 2021-07-29 | 2024-10-16 | Huawei Technologies Co., Ltd. | CAMERA MODULE AND ELECTRONIC DEVICE |
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| JP4803952B2 (en) * | 2003-06-04 | 2011-10-26 | オリンパス株式会社 | Electronic imaging device |
| JP2005173191A (en) * | 2003-12-11 | 2005-06-30 | Olympus Corp | Optical path bending optical system |
| JP2007156061A (en) * | 2005-12-05 | 2007-06-21 | Konica Minolta Opto Inc | Bending optical system, imaging lens device, and digital apparatus |
| KR102548901B1 (en) * | 2015-11-13 | 2023-06-29 | 삼성전자주식회사 | Telelens and Imaging Device |
| TWI594037B (en) * | 2016-11-24 | 2017-08-01 | 大立光電股份有限公司 | Photographing lens assembly, image capturing unit and electronic device |
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Denomination of invention: A periscope type imaging optical lens group Granted publication date: 20240816 Pledgee: China Construction Bank Corporation Panjin branch Pledgor: Liaoning Zhonglan Photoelectric Technology Co.,Ltd. Registration number: Y2024980057333 |
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