CN117631234A - Periscope type optical system, imaging module and electronic device - Google Patents
Periscope type optical system, imaging module and electronic device Download PDFInfo
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- CN117631234A CN117631234A CN202311240540.2A CN202311240540A CN117631234A CN 117631234 A CN117631234 A CN 117631234A CN 202311240540 A CN202311240540 A CN 202311240540A CN 117631234 A CN117631234 A CN 117631234A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 176
- 238000003384 imaging method Methods 0.000 title claims abstract description 44
- 238000012634 optical imaging Methods 0.000 claims description 28
- 101100148680 Arabidopsis thaliana SAG12 gene Proteins 0.000 claims description 7
- 230000000694 effects Effects 0.000 abstract description 2
- 230000004075 alteration Effects 0.000 description 13
- 201000009310 astigmatism Diseases 0.000 description 10
- 238000005452 bending Methods 0.000 description 3
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- 230000035945 sensitivity Effects 0.000 description 2
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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
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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
- G02B13/0055—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
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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
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/02—Bodies
- G03B17/17—Bodies with reflectors arranged in beam forming the photographic image, e.g. for reducing dimensions of camera
-
- 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 periscope type optical system, an imaging module and an electronic device, wherein the periscope type optical system sequentially comprises the following components from an object side to an image side: an optical reflection element, a lens group and an infrared cut-off filter, wherein the lens group comprises: the first lens element with positive refractive power has a convex object-side surface at the optical axis; a diaphragm; a second lens element with negative refractive power having a concave image-side surface at the optical axis; a third lens element with refractive power; a fourth lens element with negative refractive power having a concave object-side surface at the optical axis; a fifth lens element with positive refractive power having a convex object-side surface at the optical axis and a concave image-side surface at the optical axis; the periscope type optical system satisfies the following conditional expression: -4.3 < (r7+r8)/(R7-R8) < 0.5, wherein R7 is the radius of curvature of the object-side surface of the fourth lens element and R8 is the radius of curvature of the image-side surface of the fourth lens element. The invention has high imaging quality, and achieves the effect of long-range shooting while meeting the requirements of light and thin volume.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a periscope type optical system, an imaging module of the periscope type optical system and an electronic device.
Background
In recent years, the field of smart phones is rapidly developed, the requirements of consumers on the shooting quality of lenses are higher and higher, particularly, a long-focus shooting function is achieved, and the long-focus lens has the characteristics of no distortion, small depth of field and the like, so that the long-focus lens has the advantages in shooting characters and the like.
However, most of the existing camera modules of electronic devices have a long focus function, which results in thicker volume of the electronic device, which does not meet the requirements of lightening and miniaturization of the electronic device, and the imaging quality of the lens is reduced along with the compression of the size, and the focal length of the lens is reduced.
With the increasing trend of electronic products, a periscope type tele lens with smaller occupied space needs to be provided.
Disclosure of Invention
The invention aims to provide a periscope type optical system, an imaging module and an electronic device, which adopt a 5P aspheric optical system, have high pixels and good imaging quality, and can meet the miniaturization requirement so as to solve the problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions: a periscope type optical system sequentially comprises from an object side to an image side: the optical reflection element is used for bending an optical path, the included angle between a reflection surface and an optical axis is 45 degrees, and the mirror group comprises:
the first lens element with positive refractive power has a convex object-side surface at the optical axis;
a diaphragm;
a second lens element with negative refractive power having a concave image-side surface at the optical axis;
a third lens element with refractive power;
a fourth lens element with negative refractive power having a concave object-side surface at the optical axis;
a fifth lens element with positive refractive power having a convex object-side surface at the optical axis and a concave image-side surface at the optical axis;
wherein, R7 is the radius of curvature of the object side surface of the fourth lens element, R8 is the radius of curvature of the image side surface of the fourth lens element, and the relationship between R7 and R8 is satisfied: -4.3 < (R7+R8)/(R7-R8) is less than or equal to-0.5.
Further, the periscope type optical system satisfies the following relation: 3.7 < Imgh/TTL is 10 < 4, wherein Imgh is half of the diagonal length of the effective pixel area of the electronic photosensitive element on the imaging surface, and TTL is the distance between the object side surface of the first lens and the imaging surface of the optical system on the optical axis.
Further, the periscope type optical system satisfies the following relation: -7.3< (SAG51+SAG52)/(SAG 51-SAG 52) < -0.9, wherein SAG51 is the sagittal height of the fifth lens object side and SAG52 is the sagittal height of the fifth lens image side.
Further, the periscope type optical system satisfies the following relation: 1.2 < SD42/SD32 < 1.45, wherein SD42 is the effective half-caliber of the fourth lens image side surface, and SD32 is the effective half-caliber of the third lens image side surface.
Further, the periscope type optical system satisfies the following relation: -0.6 < f12/f345 < 0, wherein f12 is the combined focal length of the first lens and the second lens and f345 is the combined focal length of the third lens, the fourth lens and the fifth lens.
Further, the periscope type optical system satisfies the following relation: 30 DEG < FOV < 45 DEG, wherein FOV is the maximum field angle of the optical system.
Further, the periscope type optical system satisfies the following relation: SAG12/SAG52 is < 0.55, wherein SAG12 is the sagittal height of the first lens image side and SAG52 is the sagittal height of the fifth lens image side.
An imaging module comprises an image sensor and the periscope type optical system, wherein the image sensor is positioned on the image side of the optical imaging system.
An electronic device comprises an equipment main body and the imaging module, wherein the imaging module is installed on the equipment main body.
Compared with the prior art, the invention has high imaging quality, achieves the effect of long-range shooting while meeting the requirements of light and thin volume, and improves the imaging quality when the object distance is longer.
Drawings
In order to more clearly illustrate the structural features and efficacy of the present invention, a detailed description thereof will be given below with reference to the accompanying drawings and examples.
FIG. 1-1 is a schematic view of an optical system according to a first embodiment of the present invention;
FIGS. 1-2 are, in order from left to right, graphs of on-axis chromatic aberration curves, astigmatism and distortion curves for an optical imaging system according to a first embodiment of the invention;
FIG. 2-1 is a schematic diagram of an optical system according to a second embodiment of the present invention;
FIG. 2-2 is a graph of on-axis chromatic aberration curves, astigmatism and distortion curves, in order from left to right, for an optical imaging system according to a second embodiment of the present invention;
FIG. 3-1 is a schematic view of an optical system according to a third embodiment of the present invention;
FIG. 3-2 is a graph of on-axis chromatic aberration curves, astigmatism and distortion curves, in order from left to right, for an optical imaging system according to a third embodiment of the present invention;
FIG. 4-1 is a schematic view of an optical system according to a fourth embodiment of the present invention;
FIG. 4-2 is a graph of on-axis chromatic aberration curves, astigmatism and distortion curves, in order from left to right, for an optical imaging system according to a fourth embodiment of the present invention;
FIG. 5-1 is a schematic view of an optical system according to a fifth embodiment of the present invention;
FIG. 5-2 is a graph of on-axis chromatic aberration curves, astigmatism and distortion curves, in order from left to right, for an optical imaging system according to a fifth embodiment of the invention;
FIG. 6-1 is a schematic view of an optical system according to a sixth embodiment of the present invention;
FIG. 6-2 is a graph of on-axis chromatic aberration curves, astigmatism and distortion curves, in order from left to right, for an optical imaging system according to a sixth embodiment of the invention;
FIG. 7-1 is a schematic diagram of an optical system according to a seventh embodiment of the present invention;
FIG. 7-2 is a graph of on-axis chromatic aberration curves, astigmatism and distortion curves, in order from left to right, for an optical imaging system according to a seventh embodiment of the invention;
FIG. 8-1 is a schematic view of an optical system according to an eighth embodiment of the present invention;
FIG. 8-2 is a graph of on-axis chromatic aberration curves, astigmatism and distortion curves, in order from left to right, for an optical imaging system according to an eighth embodiment of the invention;
FIG. 9-1 is a schematic view of an optical system according to a ninth embodiment of the present invention;
FIG. 9-2 is a graph of on-axis chromatic aberration curves, astigmatism and distortion curves, in order from left to right, for a ninth embodiment of the optical imaging system according to the present invention;
FIG. 10-1 is a schematic view of an optical system according to a tenth embodiment of the present invention;
fig. 10-2 is a graph of on-axis chromatic aberration curves, astigmatism and distortion curves of an optical imaging system according to a tenth embodiment of the invention in order from left to right.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex location is not defined, it means that the lens surface is convex at least in the paraxial region. If the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens. The determination of the surface shape in the paraxial region can be performed by a determination method by a person skilled in the art by positive or negative determination of the concave-convex with R value (R means the radius of curvature of the paraxial region, and generally means the R value on a lens database (lens data) in optical software). In the object side surface, when the R value is positive, the object side surface is judged to be convex, and when the R value is negative, the object side surface is judged to be concave; in the image side, the concave surface is determined when the R value is positive, and the convex surface is determined when the R value is negative.
Referring to fig. 1-1, fig. 2-1, fig. 3-1, fig. 4-1, fig. 5-1, fig. 6-1, fig. 7-1, fig. 8-1, fig. 9-1 and fig. 10-1, the periscope type optical system of the present application sequentially comprises, from an object side to an image side: the optical reflection element 20, the lens group and the infrared cut-off filter 30, wherein the optical reflection element 20 may adopt a triangular prism, and the included angle between the reflection surface and the optical axis is 45 °. The lens group comprises five lenses, and the lenses are all plastic aspheric lenses. Specifically, the lens element includes a first lens element L1 with positive refractive power having a convex object-side surface at an optical axis; the diaphragm 10 is arranged on the object side of the first lens L1; the second lens element L2 with negative refractive power has a concave image-side surface at the optical axis; the refractive power of the third lens element L3 may be positive or negative; the fourth lens element L4 with negative refractive power having a concave object-side surface at the optical axis; the fifth lens element L5 with positive refractive power has a convex object-side surface at the optical axis and a concave image-side surface at the optical axis.
By reasonably configuring the surface shape and refractive power of each lens element between the first lens element L1 and the fifth lens element L5, the optical system can achieve the long focal length characteristics and simultaneously meet the design requirement of miniaturization.
During imaging, light enters the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the infrared cut filter 30 in order from the object side of the first lens L1 through the optical reflection element 20, and finally forms an image on an image plane.
The optical system satisfies the following relation:
-4.3 < (R7+R8)/(R7-R8) < 0.5, wherein R7 is the radius of curvature of the object-side surface of the fourth lens element L4 and R8 is the radius of curvature of the image-side surface of the fourth lens element L4. By reasonably configuring the curvature radiuses of the object side surface and the image side surface of the fourth lens L4, the bending degree of the fourth lens L4 can be effectively controlled, and the lens shape of the fourth lens L4 is smooth and uniform, so that the assembly sensitivity of the optical lens can be reduced, and meanwhile, the resolution capability of the optical lens can be improved, and the imaging quality of the optical lens is improved.
Preferably, the optical system satisfies the following relation:
3.7 < Imgh/TTL is 10 < 4, wherein TTL is the distance between the object side surface of the first lens L1 and the imaging surface of the optical system on the optical axis, and Imgh is half of the diagonal length of the effective pixel area of the electronic photosensitive element on the imaging surface. The ratio range is reasonably selected, so that the total length and the imaging surface size of the optical lens can be reasonably configured, the total length of the system can be ensured to be small under the condition of fixed imaging surface, and the miniaturization requirement is realized; when the ratio of the relational expression is lower than the lower limit, the total length of the system is too long, and miniaturization cannot be realized; when the ratio of the relational expression is higher than the upper limit, the total length of the optical lens is too small, so that the focal length of the optical lens is too small, and the requirement for long focal length is difficult to meet.
Preferably, the optical system satisfies the following relation:
-7.3< (SAG51+SAG52)/(SAG 51-SAG 52) < -0.9, wherein SAG51 is the sagittal height of the object side of the fifth lens L5 and SAG52 is the sagittal height of the image side of the fifth lens L5.
By reasonably configuring the object side surface and the image side surface of the fifth lens to control the sagittal height of the maximum caliber, the incidence angle of light entering the imaging surface can be reduced, and the sensitivity of the optical lens is reduced.
Preferably, the optical system satisfies the following relation:
1.2 < SD42/SD32 < 1.45, wherein SD42 is the effective half-caliber of the image side surface of the fourth lens element L4, and SD32 is the effective half-caliber of the image side surface of the third lens element L3. By controlling the configuration of the fourth lens element L4 and the fifth lens element L5 with uniform refractive power, the two parameters SD52 and SD42 satisfy the above-mentioned conditional expression, which is helpful for correcting the distortion and curvature of field generated by the first lens element L1, the second lens element L2 and the third lens element L3.
Preferably, the optical system satisfies the following relation:
-0.6 < f12/f345 < 0, where f12 is the combined focal length of the first lens L1 and the second lens L2 and f345 is the combined focal length of the third lens L3, the fourth lens L4 and the fifth lens L5. The ratio range is reasonably selected, so that the focal length is reasonably distributed, the whole lens can be more symmetrical, and the post-processing and assembly are convenient.
Preferably, the optical system satisfies the following relation:
30 DEG < FOV < 45 DEG, FOV is the maximum field angle of the optical system. The imaging range of the optical imaging lens group can be effectively controlled by reasonably controlling the maximum field angle of the optical imaging system, so that the optical imaging lens group can accurately acquire an optical signal of an object side, and the optical imaging lens group is ensured to have higher resolution and better imaging quality.
Preferably, the optical system satisfies the following relation:
SAG12/SAG52 is < 0.55, where SAG12 is the sagittal height of the image side of the first lens L1 and SAG52 is the sagittal height of the image side of the fifth lens L5. By controlling the sagittal ratio of the image side surfaces of the first lens element L1 and the fifth lens element L5 at the maximum aperture, the bending degree of the first lens element L1 and the fifth lens element L5 can be controlled, so as to balance the larger spherical aberration generated by the optical lens element, and meanwhile, the reasonable refractive power distribution of the first lens element L1 to the fifth lens element L5 is combined, so that the correction of the edge aberration is facilitated, the resolving power of the optical lens element is improved, and the imaging quality of the optical lens element is improved.
The optical system of the present embodiment will be described in detail below with reference to specific parameters.
First embodiment
Referring to fig. 1-1 and 1-2 in combination, in a first embodiment, periscope-type optical imaging systems satisfy tables 1-1,1-2 and 1-3.
The optical system sequentially comprises from an object side to an image side along an optical axis: the optical reflection element 20, the first lens L1, the diaphragm 10, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the ir cut-off filter 30 and the imaging surface 50, wherein the diaphragm 10 is disposed on the object side of the first lens L1, the optical reflection element 20 may adopt a triangular prism, the angle between the reflecting surface and the optical axis is 45 °, and the five lenses are all plastic aspheric lenses.
The first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, and the fifth lens element L5 with positive refractive power.
The object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at a paraxial region, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at a paraxial region, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at a paraxial region, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex at a paraxial region, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at a paraxial region.
The object-side surface 11 and the image-side surface 12 of the first lens element L1 are concave and convex at the circumference, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the circumference, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the circumference, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex at the circumference, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at the circumference.
Specifically, taking the focal length efl=15.35 of the optical system, the f-number fno=2.53 of the optical system, the viewing angle fov= 37.41 ° of the optical system in the system diagonal direction, and the total length ttl=13.9 of the optical system as an example, other conditions are required to satisfy the following tables 1-1,1-2 and 1-3
Tables 1-2 are aspherical data of the first embodiment, where k is the conic coefficient of each surface, and A4-a20 is the 4 th-20 th order aspherical coefficient of each surface.
Second embodiment
Referring to fig. 2-1 and 2-2, in a second embodiment, the periscope type optical imaging system satisfies tables 2-1,2-2 and 2-3.
The optical system sequentially comprises from an object side to an image side along an optical axis: the optical reflection element 20, the first lens L1, the diaphragm 10, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the ir cut-off filter 30 and the imaging surface 50, wherein the diaphragm 10 is disposed on the object side of the first lens L1, the optical reflection element 20 may adopt a triangular prism, the angle between the reflecting surface and the optical axis is 45 °, and the five lenses are all plastic aspheric lenses.
The first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with negative refractive power, the fourth lens element L4 with negative refractive power, and the fifth lens element L5 with positive refractive power.
The object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and convex at a paraxial region, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at a paraxial region, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at a paraxial region, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex at a paraxial region, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at a paraxial region.
The object-side surface 11 and the image-side surface 12 of the first lens element L1 are concave and convex at the circumference, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the circumference, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the circumference, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex at the circumference, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at the circumference.
Specifically, taking the focal length efl=15.1 of the optical system, the f-number fno=2.62 of the optical system, the viewing angle fov=38° of the optical system in the system diagonal direction, and the total length ttl=13.86 of the optical system as an example, other conditions are required to satisfy the following tables 2-1,2-2 and 2-3
Table 2-2 shows aspherical data of the second embodiment, where k is a conic coefficient of each surface, and A4-a20 is an aspherical coefficient of 4 th-20 th order of each surface.
Third embodiment
Referring to fig. 3-1 and 3-2 in combination, in a third embodiment, the periscope-type optical imaging system satisfies tables 3-1,3-2 and 3-3.
The optical system sequentially comprises from an object side to an image side along an optical axis: the optical reflection element 20, the first lens L1, the diaphragm 10, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the ir cut-off filter 30 and the imaging surface 50, wherein the diaphragm 10 is disposed on the object side of the first lens L1, the optical reflection element 20 may adopt a triangular prism, the angle between the reflecting surface and the optical axis is 45 °, and the five lenses are all plastic aspheric lenses.
The first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, and the fifth lens element L5 with positive refractive power.
The object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at a paraxial region, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are concave and concave at a paraxial region, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at a paraxial region, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex at a paraxial region, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at a paraxial region.
The object-side surface 11 and the image-side surface 12 of the first lens element L1 are concave and convex at the circumference, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the circumference, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the circumference, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex at the circumference, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at the circumference.
Specifically, taking the focal length efl=15.2 of the optical system, the f-number fno=2.69 of the optical system, the field angle fov=37.86° of the optical system in the system diagonal direction, and the total length ttl=13.9 of the optical system as an example, other conditions are required to satisfy the following tables 3-1,3-2 and 3-2.
Table 3-2 shows aspherical data of the third embodiment, where k is a conic coefficient of each surface, and A4-a20 is an aspherical coefficient of 4 th to 20 th order of each surface.
Fourth embodiment
Referring to fig. 4-1 and 4-2 in combination, in a fourth embodiment, the periscope type optical imaging system satisfies tables 4-1,4-2 and 4-3.
The optical system sequentially comprises from an object side to an image side along an optical axis: the optical reflection element 20, the first lens L1, the diaphragm 10, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the ir cut-off filter 30 and the imaging surface 50, wherein the diaphragm 10 is disposed on the object side of the first lens L1, the optical reflection element 20 may adopt a triangular prism, the angle between the reflecting surface and the optical axis is 45 °, and the five lenses are all plastic aspheric lenses.
The first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, and the fifth lens element L5 with positive refractive power.
The object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at a paraxial region, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at a paraxial region, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at a paraxial region, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and concave at a paraxial region, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at a paraxial region.
The object-side surface 11 and the image-side surface 12 of the first lens element L1 are concave and convex at the circumference, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the circumference, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the circumference, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex at the circumference, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at the circumference.
Specifically, taking the focal length efl=15.2 of the optical system, the f-number fno=2.72 of the optical system, the viewing angle fov= 37.81 ° of the optical system in the system diagonal direction, and the total length ttl=13.9 of the optical system as an example, other conditions are required to satisfy the following tables 4-1,4-2 and 4-3
Table 4-2 shows aspherical data of the fourth embodiment, where k is a conic coefficient of each surface, and A4-a20 is an aspherical coefficient of 4 th to 20 th order of each surface.
Fifth embodiment
Referring to fig. 5-1 and 5-2 in combination, in a fifth embodiment, the periscope type optical imaging system satisfies tables 5-1,5-2 and 5-3.
The optical system sequentially comprises from an object side to an image side along an optical axis: the optical reflection element 20, the first lens L1, the diaphragm 10, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the ir cut-off filter 30 and the imaging surface 50, wherein the diaphragm 10 is disposed on the object side of the first lens L1, the optical reflection element 20 may adopt a triangular prism, the angle between the reflecting surface and the optical axis is 45 °, and the five lenses are all plastic aspheric lenses.
The first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, and the fifth lens element L5 with positive refractive power.
The object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at a paraxial region, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at a paraxial region, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and convex at a paraxial region, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex at a paraxial region, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at a paraxial region.
The object-side surface 11 and the image-side surface 12 of the first lens element L1 are concave and convex at the circumference, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the circumference, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the circumference, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex at the circumference, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex at the circumference.
Specifically, taking the focal length efl=15.2, the f-number fno=2.69, the viewing angle fov=37.86° in the system diagonal direction, and the total length ttl=13.9, as examples, other conditions are satisfied in tables 5-1,5-2 and 5-3
Table 5-2 shows aspherical data of the fifth embodiment, where k is a conic coefficient of each surface, and A4-a20 is an aspherical coefficient of 4 th to 20 th order of each surface.
Sixth embodiment
Referring to fig. 6-1 and 6-2 in combination, in a sixth embodiment, the periscope type optical imaging system satisfies tables 6-1,6-2 and 6-3.
The optical system sequentially comprises from an object side to an image side along an optical axis: the optical reflection element 20, the first lens L1, the diaphragm 10, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the ir cut-off filter 30 and the imaging surface 50, wherein the diaphragm 10 is disposed on the object side of the first lens L1, the optical reflection element 20 may adopt a triangular prism, the angle between the reflecting surface and the optical axis is 45 °, and the five lenses are all plastic aspheric lenses.
The first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, and the fifth lens element L5 with positive refractive power.
The object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at a paraxial region, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at a paraxial region, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and convex at a paraxial region, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex at a paraxial region, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at a paraxial region.
The object-side surface 11 and the image-side surface 12 of the first lens element L1 are concave and convex at the circumference, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the circumference, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the circumference, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex at the circumference, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex at the circumference.
Specifically, taking the focal length efl=15.2, the f-number fno=2.61, the viewing angle fov=37.86° in the system diagonal direction, and the total length ttl=13.9, as examples, other conditions are satisfied in tables 6-1,6-2 and 6-3
Table 6-2 shows aspherical data of the sixth embodiment, where k is a conic coefficient of each surface, and A4-a20 is an aspherical coefficient of 4 th to 20 th order of each surface.
Seventh embodiment
Referring to fig. 7-1 and 7-2 in combination, in a seventh embodiment, the periscope type optical imaging system satisfies tables 7-1,7-2 and 7-3.
The optical system sequentially comprises from an object side to an image side along an optical axis: the optical reflection element 20, the first lens L1, the diaphragm 10, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the ir cut-off filter 30 and the imaging surface 50, wherein the diaphragm 10 is disposed on the object side of the first lens L1, the optical reflection element 20 may adopt a triangular prism, the angle between the reflecting surface and the optical axis is 45 °, and the five lenses are all plastic aspheric lenses.
The first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with negative refractive power, the fourth lens element L4 with negative refractive power, and the fifth lens element L5 with positive refractive power.
The object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at a paraxial region, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at a paraxial region, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at a paraxial region, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex at a paraxial region, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at a paraxial region.
The object-side surface 11 and the image-side surface 12 of the first lens element L1 are concave and convex at the circumference, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the circumference, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the circumference, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex at the circumference, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at the circumference.
Specifically, taking the focal length efl=15.2, the f-number fno=2.61, the viewing angle fov=38° in the direction of the system angle of the optical system, and the total length ttl=13.4 of the optical system as examples, other conditions are satisfied in tables 7-1,7-2 and 7-3 below
Table 7-2 shows aspherical data of the seventh embodiment, where k is a conic coefficient of each surface, and A4-a20 is an aspherical coefficient of 4 th to 20 th order of each surface.
Eighth embodiment
Referring to fig. 8-1 and 8-2 in combination, in an eighth embodiment, the periscope-type optical imaging system satisfies tables 8-1, 8-2 and 8-3.
The optical system sequentially comprises from an object side to an image side along an optical axis: the optical reflection element 20, the first lens L1, the diaphragm 10, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the ir cut-off filter 30 and the imaging surface 50, wherein the diaphragm 10 is disposed on the object side of the first lens L1, the optical reflection element 20 may adopt a triangular prism, the angle between the reflecting surface and the optical axis is 45 °, and the five lenses are all plastic aspheric lenses.
The first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, and the fifth lens element L5 with positive refractive power.
The object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at a paraxial region, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at a paraxial region, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at a paraxial region, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex at a paraxial region, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at a paraxial region.
The object-side surface 11 and the image-side surface 12 of the first lens element L1 are concave and convex at the circumference, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the circumference, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the circumference, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex at the circumference, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex at the circumference.
Specifically, taking the focal length efl=15.2 of the optical system, the f-number fno=3 of the optical system, the viewing angle fov=37.89° of the optical system in the system diagonal direction, and the total length ttl=13.9 of the optical system as an example, other conditions are required to satisfy the following tables 8-1, 8-2 and 8-3.
Table 8-2 shows aspherical data of the eighth embodiment, where k is a conic coefficient of each surface, and A4-a20 is an aspherical coefficient of 4 th to 20 th order of each surface.
Ninth embodiment
Referring to fig. 9-1 and 9-2 in combination, in the ninth embodiment, the periscope type optical imaging system satisfies tables 9-1, 9-2 and 9-3.
The optical system sequentially comprises from an object side to an image side along an optical axis: the optical reflection element 20, the first lens L1, the diaphragm 10, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the ir cut-off filter 30 and the imaging surface 50, wherein the diaphragm 10 is disposed on the object side of the first lens L1, the optical reflection element 20 may adopt a triangular prism, the angle between the reflecting surface and the optical axis is 45 °, and the five lenses are all plastic aspheric lenses.
The first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, and the fifth lens element L5 with positive refractive power.
The object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at a paraxial region, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at a paraxial region, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at a paraxial region, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex at a paraxial region, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at a paraxial region.
The object-side surface 11 and the image-side surface 12 of the first lens element L1 are concave and convex at the circumference, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the circumference, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the circumference, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex at the circumference, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex at the circumference.
Specifically, taking the focal length efl=15.2 of the optical system, the f-number fno=2.53 of the optical system, the viewing angle fov= 37.98 ° of the optical system in the system diagonal direction, and the total length ttl=14.2 of the optical system as an example, other conditions are required to satisfy the following tables 9-1, 9-2 and 9-3.
Table 9-2 shows aspherical data of the ninth embodiment, where k is a conic coefficient of each surface, and A4-a20 is an aspherical coefficient of 4 th to 20 th order of each surface.
Tenth embodiment
Referring to fig. 10-1 and 10-2 in combination, in the tenth embodiment, the periscope type optical imaging system satisfies tables 10-1, 10-2 and 10-3.
The optical system sequentially comprises from an object side to an image side along an optical axis: the optical reflection element 20, the first lens L1, the diaphragm 10, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the ir cut-off filter 30 and the imaging surface 50, wherein the diaphragm 10 is disposed on the object side of the first lens L1, the optical reflection element 20 may adopt a triangular prism, the angle between the reflecting surface and the optical axis is 45 °, and the five lenses are all plastic aspheric lenses.
The first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, and the fifth lens element L5 with positive refractive power.
The object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at a paraxial region, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at a paraxial region, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at a paraxial region, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and concave at a paraxial region, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at a paraxial region.
The object-side surface 11 and the image-side surface 12 of the first lens element L1 are concave and convex at the circumference, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the circumference, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the circumference, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex at the circumference, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex at the circumference.
Specifically, taking the focal length efl=15.2 of the optical system, the f-number fno=2.2 of the optical system, the viewing angle fov= 37.98 ° of the optical system in the system diagonal direction, and the total length ttl=13.9 of the optical system as an example, other conditions are required to satisfy the following tables 10-1, 10-2 and 10-3.
Table 10-2 shows aspherical data of the tenth embodiment, where k is a conic coefficient of each surface, and A4-a20 is an aspherical coefficient of 4 th to 20 th order of each surface.
By arranging the optical reflection element, the periscope type long-focus optical imaging system in the embodiment can bend the light path without affecting imaging quality, and well solves the problem of thickness increase caused by long focus. The five-piece lens structure is adopted, the thickness of the lens can be reduced, and the imaging quality and the long focal length characteristic of the lens are ensured.
In the description of the present invention, it should be understood that the terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
While the fundamental and principal features of the invention and advantages of the invention have been shown and described, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A periscope type optical system sequentially comprises from an object side to an image side: optical reflection element, mirror group and infrared cut-off filter, its characterized in that, the mirror group includes:
the first lens element with positive refractive power has a convex object-side surface at the optical axis;
a diaphragm;
a second lens element with negative refractive power having a concave image-side surface at the optical axis;
a third lens element with refractive power;
a fourth lens element with negative refractive power having a concave object-side surface at the optical axis;
a fifth lens element with positive refractive power having a convex object-side surface at the optical axis and a concave image-side surface at the optical axis;
wherein, R7 is the radius of curvature of the object side surface of the fourth lens element, R8 is the radius of curvature of the image side surface of the fourth lens element, and the following conditions are satisfied between R7 and R8: -4.3 < (R7+R8)/(R7-R8) is less than or equal to-0.5.
2. The periscope type optical system according to claim 1, wherein: the distance from the object side surface of the first lens to the imaging surface of the optical system on the optical axis is TTL, half of the diagonal line length of the effective pixel area of the electronic photosensitive element on the imaging surface is Imgh, and the TTL and the Imgh satisfy the relation: 3.7 < Imgh/TTL 10 < 4.
3. The periscope type optical system according to claim 1, wherein: the sagittal height of the object side of the fifth lens is SAG51, the sagittal height of the image side of the fifth lens is SAG52, and the relation between SAG51 and SAG52 is satisfied: -7.3< (SAG51+SAG52)/(SAG 51-SAG 52) < -0.9.
4. The periscope type optical system according to claim 1, wherein: the effective half-caliber of the fourth lens image side surface is SD42, the effective half-caliber of the third lens image side surface is SD32, and the relation between SD42 and SD32 is satisfied: 1.2 < SD42/SD32 < 1.45.
5. The periscope type optical system according to claim 1, wherein: the combined focal length of the first lens and the second lens is f12, the combined focal length of the third lens, the fourth lens and the fifth lens is f345, and the relation between f12 and f345 is satisfied: -0.6 < f12/f345 < 0.
6. The periscope type optical system according to claim 1, wherein: the maximum field angle of the optical system is FOV, which satisfies the relation: the FOV is less than 30 DEG and less than 45 deg.
7. The periscope type optical system according to claim 1, wherein: the sagittal height of the image side of the first lens is SAG12, the sagittal height of the image side of the fifth lens is SAG52, and the relation between SAG12 and SAG52 is satisfied: the I SAG12/SAG 52I < 0.55.
8. An imaging module, characterized in that: the imaging module comprises an image sensor, which is located on the image side of the optical imaging system, as claimed in any one of claims 1 to 7.
9. An electronic device, characterized in that: comprising an apparatus body and the imaging module of claim 8, the imaging module being mounted on the apparatus body.
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