CN117222930A - Ultra-wide angle lens optical system - Google Patents
Ultra-wide angle lens optical system Download PDFInfo
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- CN117222930A CN117222930A CN202180097465.1A CN202180097465A CN117222930A CN 117222930 A CN117222930 A CN 117222930A CN 202180097465 A CN202180097465 A CN 202180097465A CN 117222930 A CN117222930 A CN 117222930A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 116
- 238000003384 imaging method Methods 0.000 claims abstract description 16
- 230000004075 alteration Effects 0.000 description 26
- 238000010586 diagram Methods 0.000 description 9
- 230000002093 peripheral effect Effects 0.000 description 8
- 206010010071 Coma Diseases 0.000 description 6
- 230000004907 flux Effects 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 201000009310 astigmatism Diseases 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
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- 238000007665 sagging Methods 0.000 description 1
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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
- G02B13/04—Reversed telephoto objectives
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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
- 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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/62—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having six components only
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Abstract
An ultra-wide angle lens optical system is provided, which is composed of a front lens (L1), a non-planar prism (L2) and a rear lens group (L3, L4, L5, L6, L7). The non-planar prism (L2) has a non-planar surface on both the object side and the imaging side. The non-planar prism (L2) is configured to bend the optical path by 90 degrees.
Description
Technical Field
The present invention relates to an image pickup lens that forms an object image for a solid-state image sensor such as a CCD or CMOS sensor, and more particularly, to an ultra-wide angle lens for a CCD or CMOS sensor of a portable device such as a smart phone, a game machine, a PC, an IP camera, a home electric appliance, an automobile, or the like. It also relates to an ultra-wide angle lens and a photographing apparatus mounted on an unmanned aerial vehicle or the like.
Background
With the popularization of smart phones in recent years, the demand for imaging lenses has become diversified, and it is desired to improve optical performance such as wider angle of view, higher tele performance, larger diameter (higher NA), and the like, while maintaining the imaging module size that is directly affected by the product size. Nowadays, when a multi-camera system becomes the mainstream, an ultra-wide angle lens plays an important role in measuring the differentiation of smart phone products, because the ultra-wide angle lens is suitable for photographing landscapes, buildings, itself, indoor, macro photography, and the like. Here, the ultra-wide angle refers to a half angle of view of about 45 ° or more.
As an example of such an ultra-wide angle lens module, japanese patent publication No. 2018072716a discloses an optical system composed of six lenses including a negative lens L1 and a positive lens L2. Here, with respect to terms used in the present invention, positive/negative of a lens refers to positive/negative of a focal length of the lens near an optical axis unless otherwise specified.
However, the imaging lens as described in japanese patent publication No. 2018072716a has a large distortion, i.e., -10% to-30%. In ultra-wide angle imaging optics, distortion is typically sacrificed in order to ensure a sufficiently small total optical length and to ensure imaging performance, which is certainly not desirable for users considering larger distortion as a camera defect. In addition, there are many cameras that perform digital processing to correct such distortion problems, but as a result, such digital processing reduces the ultra-wide angle of view, reduces image quality, and thus reduces the benefits of ultra-wide angle lenses, resulting in losing competitiveness as a camera.
An ultra-wide angle imaging optical system that satisfactorily corrects such distortion is disclosed in japanese patent publication P2018-25794A. However, in order to correct distortion, the total optical length of the optical system becomes 25mm or more, which results in an increase in the product size, failing to meet the recent demand for a very thin mobile device.
In order to shorten the total optical length of the optical system, it has been considered to bend the optical path by using a prism. Although the use of a prism shortens the total optical length, there is a problem in that the front lens is pushed aside by the amount of thickness increase. There is a need for an ultra-wide angle lens that solves the above-mentioned problems.
Accordingly, there is a need for an ultra-wide angle lens optical system that can solve the above-described problems of CCD or CMOS sensors for portable devices such as smartphones, game machines, PCs, IP cameras, home appliances, automobiles, and the like.
Disclosure of Invention
The present invention reduces and/or eliminates the above-mentioned drawbacks.
It is a primary object of the present invention to provide an ultra-wide angle lens optical system to provide a short TTL, thin and high quality image with less distortion. By using the ultra-wide angle lens optical system of the present invention, it can be installed in a thin product while suppressing distortion, so that high image quality can be obtained in spite of the ultra-wide angle lens.
According to a first aspect, an ultra-wide angle lens optical system is provided. The ultra-wide angle lens optical system consists of a front lens, a non-planar prism and a rear lens group. The non-planar prism has a non-planar surface on both the object side and the image side and is configured to bend the optical path by 90 °. Since the non-planar prisms have diopters, the front lens may be disposed very close to the non-planar prisms to minimize the distance between the front surface of the front lens and the non-planar prisms (i.e., the optical axis of the rear lens group).
Thus, both the thickness and the TTL of the optical module can be smaller than those of a conventional optical module using regular prisms, because it enables a configuration in which the front sphere protrudes slightly from the maximum diameter of the rear group of the lens system.
According to an aspect of the present invention, there is provided a super wide angle lens optical system including a first lens, a non-planar prism, and a rear lens group from an object side to an image side, wherein ω is a half angle of view of the super wide angle lens optical system, f is a focal length of the super wide angle lens optical system, and f1 is a focal length of the first lens, satisfying the following condition:
(i) Omega is more than or equal to 50 and less than or equal to 75, more preferably 55 and less than or equal to 70;
(ii) -3.9.ltoreq.f1/f.ltoreq.0.8, more preferably-2.8.ltoreq.f1/f.ltoreq.1.3.
The condition (ii) defines that the ultra-wide angle lens optical system can appropriately control the area of the luminous flux incident on the non-planar prism while realizing the range of the angle of view defined by the condition (i).
An aspect of the present ultra-wide angle lens optical system according to claim 1, wherein f2 is a focal length of the non-planar prism, which satisfies the following condition:
(iii) 2.ltoreq.f2/f.ltoreq.9.5, more preferably 3.ltoreq.f2/f.ltoreq.7.5.
Condition (iii) defines the diopter range of the non-planar prism to satisfactorily correct distortion and coma, achieve miniaturization, and ensure a sufficient amount of peripheral light.
An aspect of the present ultra-wide angle lens optical system according to any one of the preceding claims, wherein f (g_rear) is a focal length of the rear group, which satisfies the following condition:
(iv) 1.3.ltoreq.f (G_return)/f.ltoreq.3.3, more preferably 1.6.ltoreq.f (G_return)/f.ltoreq.2.5.
Condition (iv) defines a range effective to achieve good correction of field curvature and shortening of the total optical length (optical overall length, TTL).
The ultra-wide angle lens optical system according to any one of the preceding claims, wherein TTL is a total length of an optical path from an imaging surface to a front surface of the first lens, which satisfies the following condition:
(v) TTL/f is more preferably 6.ltoreq.TTL/f is more preferably 7.6.ltoreq.TTL/f is more preferably 14.
The condition (v) defines an optical total length condition suitable for sufficiently reducing distortion and then satisfactorily correcting coma and field curvature. The ultra-wide angle lens optical system according to any one of the preceding claims, wherein sag_l2s2 is an amount of sag on a rear surface of the non-planar prism L2, when a direction toward the imaging surface is positive, a direction toward an object is negative, and rad_l2s2 is an optically effective radius of the image side of the non-planar prism L2, it satisfies the following condition:
(vi) -0.15. Ltoreq.SAg_L2S2/rad_L2S2. Ltoreq.0.1, more preferably-0.1. Ltoreq.SAg_L2S2/rad_L2S2. Ltoreq.0.05.
The condition (vi) enables light to be injected into the lens group g_rear at an appropriate angle of light emitted from the image side surface of the non-planar prism L2.
According to a second aspect, a camera is provided. The camera comprises the ultra-wide angle lens optical system and the image sensor provided in the first aspect. The ultra-wide angle lens optical system is used for inputting light for carrying image data into the image sensor; the image sensor is used for displaying images according to the image data.
According to a third aspect, a terminal is provided. The terminal comprises a camera, i.e. a camera as provided in the second aspect, and a graphics processing unit (graphic processing unit, GPU). The GPU is connected to the camera. The camera is used to obtain image data and input the image data into the GPU, and the CPU is used to process the image data received from the camera. The terminal can be applied to a small camera of mobile equipment such as a mobile phone, a tablet computer and the like.
The invention will be presented in further detail by the following description and the accompanying drawings, which show preferred embodiments according to the invention for illustrative purposes only.
Drawings
The invention may be better understood by reference to the following detailed description of non-limiting embodiments of the invention, taken in conjunction with the accompanying drawings, in which:
FIG. 1-1 shows a cross-sectional view of an optical lens system provided by a first embodiment of the present invention;
FIGS. 1-2 show longitudinal spherical aberration of an optical lens system provided by a first embodiment of the present invention;
FIGS. 1-3 illustrate astigmatic fields of an optical lens system provided by a first embodiment of the present invention;
FIGS. 1-4 illustrate distortion of an optical lens system provided by a first embodiment of the present invention;
FIG. 2-1 shows a cross-sectional view of an optical lens system provided by a second embodiment of the present invention;
fig. 2-2 shows longitudinal spherical aberration of an optical lens system provided by a second embodiment of the present invention;
FIGS. 2-3 illustrate astigmatic fields of an optical lens system provided by a second embodiment of the present invention;
FIGS. 2-4 illustrate distortion of an optical lens system provided by a second embodiment of the present invention;
FIG. 3-1 shows a cross-sectional view of an optical lens system provided by a third embodiment of the present invention;
fig. 3-2 shows longitudinal spherical aberration of an optical lens system provided by a third embodiment of the present invention;
fig. 3-3 show astigmatic fields of an optical lens system according to a third embodiment of the present invention;
FIGS. 3-4 illustrate distortion of an optical lens system provided by a third embodiment of the present invention;
fig. 4 shows an implementation of the invention.
Detailed Description
The following embodiments of the ultra-wide angle lens optical system of the present invention will be described with reference to the drawings and optical data. The lens system can be applied to cameras of mobile devices such as mobile phones and tablet computers. In addition, the present optical system is composed of a front lens, a non-planar prism, and a rear lens group composed of five lenses. The rear lens of the group may be composed of less or more than five lenses.
The non-planar prism has non-planar surfaces on both the object side and the image side such that the front lens may be disposed very close to the non-planar prism in order to minimize the distance between the front surface of the front lens and the optical axis of the remaining lenses. Thus, both the thickness and TTL of the optical module can be smaller than a conventional optical module using regular prisms, as it enables a configuration in which the front sphere protrudes slightly from the largest diameter of the rear group of lens systems.
Accordingly, the following embodiments of the ultra-wide angle lens optical system of the present invention can achieve high image quality, and are substantially free of distortion and compact.
First embodiment
FIG. 1-1 shows a cross-sectional view of an optical lens system provided by a first embodiment of the present invention; the optical lens system includes, from the object side, a first lens L1 having a positive refractive power, a non-planar prism L2 having a positive refractive power and bending an optical path by 90 °, and a rear group (g_rear) of the lens system composed of a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. Further, the term "stop" means a stop surface disposed between the non-planar prism L2 and the third lens L3. An infrared cut filter or a filter IR such as a glass cover plate is arranged between the L7 lens and the imaging surface. Note that this filter IR may be omitted.
Table 1-1 shows the radius of curvature of each lens element, the thickness or interval of each optical surface at the center, the refractive power of the d-line, and the abbe number with respect to the d-line of the optical lens system according to the first embodiment.
TABLE 1-1
It is also noted that the surface of the strip indicates that the surface is an aspheric surface, so that all surfaces of each optical element in the first embodiment are aspheric surfaces. In the first embodiment, only the fifth lens L5 is made of an optical glass material, and the other lenses are made of a plastic material.
Tables 1-2 show the aspherical coefficients of each lens element of the optical lens system according to the first embodiment, wherein numerals 2, 4, … …, 20 represent higher order aspherical coefficients. The equation for the aspherical surface profile is expressed as follows:
wherein,
and z: a distance (sagging amount) from the vertex of the lens surface in the optical axis direction;
h: a height in a direction perpendicular to the optical axis direction;
c: paraxial curvature (inverse of radius of curvature) at the lens vertex;
y: a distance from a point on the curve of the aspherical surface to the optical axis;
k: a conic coefficient;
ai: aspheric coefficients of the i-order.
Table 1-2 aspherical coefficients
Fig. 1-2 show spherical aberration diagrams showing the aberration amounts for each wavelength of the F-line (486.1 nm), d-line (587.6 nm), and C-line (656.3 nm) (solid line).
Fig. 1 to 3 show astigmatism diagrams, the amount of d-ray aberration on the sagittal image surface S is indicated by a solid line, and the amount of d-ray aberration on the tangential image surface T is indicated by a broken line.
Fig. 1 to 4 show distortion diagrams showing the amount of aberration on the d-line with a solid line.
As can be seen from the graph, each aberration is satisfactorily corrected. Further, with respect to the term used in the present invention, refractive power refers to refractive power in the paraxial (near the optical axis).
Second embodiment
FIG. 2-1 shows a cross-sectional view of an optical lens system provided by a second embodiment of the present invention; the optical lens system includes, from the object side, a first lens L1 having a negative refractive power, a non-planar prism L2 having a positive refractive power and bending an optical path by 90 °, and a rear group (g_rear) of the lens system composed of a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. Further, the term "stop" means a stop surface disposed between the non-planar prism L2 and the third lens L3. An infrared cut filter or a filter IR such as a glass cover plate is arranged between the L7 lens and the imaging surface. Note that this filter IR may be omitted.
Tables 1-2 show the radius of curvature of each lens element, the thickness or interval of each optical surface at the center, the refractive power of the d-line, and the abbe number with respect to the d-line of the optical lens system according to the second embodiment.
TABLE 2-1
It should also be noted that the surface with x indicates that the surface is an aspherical surface, so that in the second embodiment, unless all surfaces other than the planar prism L2 are composed of aspherical surfaces, L2 is composed of double sided spherical surfaces. In a second embodiment, all optical elements are made of plastic material.
Table 2-2 shows the aspherical coefficients of each lens element of the optical lens system according to the second embodiment, wherein numerals 2, 4, … …, 20 represent higher order aspherical coefficients. The aspherical coefficients are given as described above.
TABLE 2-2 aspherical coefficients
Fig. 2-2 shows a spherical aberration diagram showing the aberration amounts for each wavelength of the F-line (486.1 nm), d-line (587.6 nm), and C-line (656.3 nm) (solid line).
Fig. 2-3 show astigmatism diagrams, the amount of d-ray aberration on the sagittal image surface S being indicated by a solid line, and the amount of d-ray aberration on the tangential image surface T being indicated by a broken line.
Fig. 2 to 4 show distortion diagrams showing the amount of aberration on the d-line with a solid line.
As can be seen from the graph, each aberration is satisfactorily corrected. Further, with respect to the term used in the present invention, refractive power refers to refractive power in the paraxial (near the optical axis).
Third embodiment
Fig. 3-1 shows a cross-sectional view of an optical lens system provided by a third embodiment of the present invention. The optical lens system includes, from the object side, a first lens L1 having a negative refractive power, a non-planar prism L2 having a positive refractive power and bending an optical path by 90 °, and a rear group (g_rear) of the lens system composed of a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. Further, the term "stop" means a stop surface disposed between the non-planar prism L2 and the third lens L3. An infrared cut filter or a filter IR such as a glass cover plate is arranged between the L7 lens and the imaging surface. Note that this filter IR may be omitted.
Table 3-1 shows the radius of curvature of each lens element, the thickness or interval of each optical surface at the center, the refractive power of the d-line, and the abbe number with respect to the d-line of the optical lens system according to the third embodiment.
TABLE 3-1
It is also noted that the surface of the strip indicates that the surface is an aspherical surface, so that all surfaces of each optical element in the third embodiment are aspherical surfaces. All optical elements are made of plastic material.
Table 3-2 shows the aspherical coefficients of each lens element of the optical lens system according to the third embodiment, wherein numerals 2, 4, … …, 20 represent higher order aspherical coefficients. The aspherical coefficients are given as described above.
TABLE 3-2 aspherical coefficients
Fig. 3-2 shows a spherical aberration diagram showing the aberration amounts for each wavelength of the F-line (486.1 nm), d-line (587.6 nm), and C-line (656.3 nm) (solid line).
Fig. 3-3 show astigmatism diagrams, the amount of d-ray aberration on the sagittal image surface S being indicated by a solid line, and the amount of d-ray aberration on the tangential image surface T being indicated by a broken line.
Fig. 3-4 show distortion diagrams showing the amount of aberration on the d-line with solid lines.
As can be seen from the graph, each aberration is satisfactorily corrected. Further, with respect to the term used in the present invention, refractive power refers to refractive power in the paraxial (near the optical axis).
As shown in the optical data above, the ultra-wide angle lens optical system of the present invention can achieve high image quality with substantially no distortion and compactness. The ultra-wide angle lens in these embodiments achieves preferable effects by satisfying the following conditions:
(i)50≤ω≤75
where ω is the half view angle.
(ii)–3.9≤f1/f≤–0.8
Where f is the focal length of the ultra-wide angle lens optical system, and f1 is the focal length of the first lens L1.
(iii)2≤f2/f≤9.5
Where f is the focal length of the ultra-wide angle lens optical system and f2 is the focal length of the non-planar prism L2.
(iv)1.3≤f(G_rear)/f≤3.3
Where f is the focal length of the ultra-wide angle lens optical system, and f (g_rear) is the focal length of the rear group g_rear.
(v)6≤TTL/f≤16
Where f is a focal length of the ultra-wide angle lens optical system, and TTL is a total length of an optical path from the imaging surface to the surface S1 of the first lens L1.
(vi)–0.15≤sag_L2S2/rad_L2S2≤0.1
Wherein when the direction toward the imaging surface is positive, the direction toward the object is negative, and rad_l2s2 is the optically effective radius of the S2 surface of the non-planar prism L2, sag_l2s2 is the amount of sag on the S2 surface of the non-planar prism L2.
Condition (i) defines the field angle range of the ultra-wide angle lens. If it is below this lower limit, a large distortion as described above occurs. Further, even with the configuration of the present invention, it is difficult to correct distortion aberration generated when the upper limit is exceeded, as well as coma aberration and field curvature, in a well-balanced manner. Specifically, resolution performance decreases due to excessive increases in diopters of the non-planar prisms. From this point of view, the following ranges are preferable.
(i)-2：55≤ω≤70。
The condition (ii) defines that the ultra-wide angle lens optical system can appropriately control the area of the luminous flux incident on the non-planar prism while realizing the range of the angle of view defined by the condition (i). If it is below the lower limit, the prism thickness becomes large, and the thickness at which the ultra-wide angle lens optical system can be mounted on a thin product cannot be achieved. If the upper limit is exceeded, the prism thickness becomes small, but coma and spherical aberration occur due to abrupt bending of the light rays by the first lens, and good resolution performance cannot be obtained. From this point of view, the following ranges are preferable.
(ii)-2：–2.8≤f1/f≤–1.3
Condition (iii) defines the diopter range of the non-planar prism to satisfactorily correct distortion and coma, achieve miniaturization, and ensure a sufficient amount of peripheral light. If this upper limit is exceeded, the diopter of the non-planar prism will be impaired and the effect will be the same as that of a commonly used right angle prism. If it is below the lower limit, the diopter of the non-planar prism becomes too strong and the resolution performance decreases. From this point of view, the following ranges are preferable.
(iii)-2：3≤f2/f≤7.5。
Regarding the peripheral light, it is known that as the angle of view increases, the amount of the peripheral light decreases due to the cosine fourth law. One way to ameliorate this problem is to create distortion, which will distort the image as described above. Another way to improve the peripheral light is to increase the vignetting factor. This means that the thickness of the light flux incident on the first lens L1 is thicker than the center light flux. This amplification of the peripheral light flux prevents the peripheral light amount from decreasing. In the context of the present invention, by observing conditions (ii) and (iii), the vignetting factor can be maximized, so that the peripheral light quantity can be ensured.
Condition (iv) defines a range effective to achieve good correction of field curvature and shortening of the total optical length (optical overall length, TTL). By satisfying this range, the field curvature can be satisfactorily corrected, and the total optical length can be shortened. If the upper limit is exceeded, the total optical length becomes longer, and if it is below the lower limit, field curvature is generated, and resolution performance is degraded. From this point of view, the following ranges are preferable.
(iv)-2：1.6≤f(G_rear)/f≤2.5
The condition (v) defines an optical total length condition suitable for sufficiently reducing distortion and then satisfactorily correcting coma and field curvature. Exceeding the upper limit will result in an increase in the size of the lens module. The space is not infinite even though it is curved and lowered. If +is lower than the lower limit, the aberration correction becomes insufficient, and the resolution performance is lowered. From this point of view, the following ranges are preferable.
(v)-2：7.6≤TTL/f≤14
The condition (vi) enables light to be injected into the lens group g_rear at an appropriate angle of light emitted from the image side surface of the non-planar prism L2. If it deviates from this range, it is difficult to maintain an ultra-wide angle and aberration correction. Further, within this range, it is possible to make it easier to manufacture the non-planar prisms and assemble the front and rear groups. From this point of view, the following ranges are preferable.
(vi)-2：–0.1≤sag_L2S2/rad_L2S2≤0.05
With the ultra-wide angle lens optical system of the present invention, distortion can be kept very low (less than 5%) despite the presence of an ultra-wide angle. In addition, it also enables the first lens L1 to be disposed close to the non-planar prism L2, in other words, to keep the thickness of the ultra-wide angle lens module very small. Accordingly, the ultra-wide angle lens optical system of the present invention may be used in many mobile devices to provide ultra-wide angle and preferred image quality.
Furthermore, a camera is provided. The camera in the present invention includes the ultra-wide angle lens optical system and the image sensor in the present invention. The ultra-wide angle lens optical system is used for inputting light, and the light is used for projecting an image to the image sensor; the image sensor is used to convert an image into digital image data. Such a camera is preferably installed in a mobile device.
Fig. 4 shows a terminal 1000 of the present disclosure. Terminal 1000 can include camera 100 and graphics processing unit (graphic processing unit, GPU) 200 provided in the implementations described above. The camera 100 is for converting an image passing through the ultra-wide angle lens optical system of the present invention into digital image data and inputting the digital image data into the GPU 200, and the GPU 200 is for processing the image data received from the camera.
In fig. 4, the terminal includes two cameras 100. However, the terminal may include a single camera or two or more cameras, and it (or they) may be connected to a single GPU 200. Terminal 1000 can be used in a high resolution cell phone camera such as a cell phone camera with ultra wide angle, high image quality and compactness.
In the present invention, ultra-wide angle herein means a half angle of view of about 45 ° or more.
Although the lens system according to the invention may be applied in particular to a cell phone camera, it may also be applied to a camera in any mobile device, such as a smart phone, a game machine, a PC, an IP camera, a home appliance, an automobile, etc.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
Claims (8)
1. An ultra-wide angle lens optical system, characterized in that it comprises a first lens, a non-planar prism and a rear lens group from an object side to an image side, wherein ω is a half view angle of the ultra-wide angle lens optical system, f is a focal length of the ultra-wide angle lens optical system, and f1 is a focal length of the first lens, satisfying the following conditions:
(i) Omega is more than or equal to 50 and less than or equal to 75, more preferably 55 and less than or equal to 70;
(ii) -3.9.ltoreq.f1/f.ltoreq.0.8, more preferably-2.8.ltoreq.f1/f.ltoreq.1.3.
2. The ultra-wide angle lens optical system according to claim 1, wherein f2 is a focal length of the non-planar prism, which satisfies the following condition:
(iii) 2.ltoreq.f2/f.ltoreq.9.5, more preferably 3.ltoreq.f2/f.ltoreq.7.5.
3. The ultra-wide angle lens optical system according to any one of the preceding claims, wherein f (g_rear) is a focal length of the back group, which satisfies the following condition:
(iv) 1.3.ltoreq.f (G_return)/f.ltoreq.3.3, more preferably 1.6.ltoreq.f (G_return)/f.ltoreq.2.5.
4. The ultra-wide angle lens optical system according to any one of the preceding claims, wherein TTL is the total length of the optical path from the imaging surface to the front surface of the first lens, which satisfies the following condition:
(v) TTL/f is more preferably 6.ltoreq.TTL/f is more preferably 7.6.ltoreq.TTL/f is more preferably 14.
5. The ultra-wide angle lens optical system according to any one of the preceding claims, wherein sag_l2s2 is an amount of sag on a rear surface of the non-planar prism, when a direction toward the imaging surface is positive, a direction toward an object is negative, and rad_l2s2 is an optical effective radius of the image side of the non-planar prism, it satisfies the following condition:
(vi) -0.15. Ltoreq.SAg_L2S2/rad_L2S2. Ltoreq.0.1, more preferably-0.1. Ltoreq.SAg_L2S2/rad_L2S2. Ltoreq.0.05.
6. The ultra-wide angle lens optical system according to any one of the preceding claims, wherein said rear group consists of five lenses.
7. A camera comprising the ultra-wide angle lens optical system according to any one of the preceding claims, further comprising an image sensor, wherein the ultra-wide angle lens optical system is for projecting an image onto the image sensor and the image sensor is for converting the image into digital image data.
8. Terminal comprising a camera according to claim 7 and a graphics processing unit (graphic processing unit, GPU), wherein the GPU is connected to the camera for receiving and processing the digital image.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2021/091258 WO2022226957A1 (en) | 2021-04-30 | 2021-04-30 | An ultra-wide-angle lens optical system |
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| CN117222930A true CN117222930A (en) | 2023-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180097465.1A Pending CN117222930A (en) | 2021-04-30 | 2021-04-30 | Ultra-wide angle lens optical system |
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| WO (1) | WO2022226957A1 (en) |
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| CN115308878A (en) | 2022-03-04 | 2022-11-08 | 马颖鏖 | Wide-angle lens |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2007033476A (en) * | 2005-07-22 | 2007-02-08 | Nidec Copal Corp | Zoom lens |
| CN100520478C (en) * | 2006-09-06 | 2009-07-29 | 亚洲光学股份有限公司 | Minisize wide-angle lens |
| CN100538423C (en) * | 2006-12-28 | 2009-09-09 | 亚洲光学股份有限公司 | Minisize image acquisition lens |
| JP4352347B2 (en) * | 2007-08-22 | 2009-10-28 | ソニー株式会社 | Zoom lens and imaging device |
| JP5226888B2 (en) * | 2012-06-19 | 2013-07-03 | オリンパス株式会社 | Bending imaging optical system |
| KR20180005464A (en) * | 2016-07-06 | 2018-01-16 | 삼성전자주식회사 | Optical lens assembly and electronic apparatus having the same |
| KR20180015485A (en) * | 2016-08-03 | 2018-02-13 | 삼성전자주식회사 | Optical lens assembly and electronic apparatus having the same |
| CN111399179A (en) * | 2020-04-27 | 2020-07-10 | 浙江舜宇光学有限公司 | Optical imaging lens |
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- 2021-04-30 WO PCT/CN2021/091258 patent/WO2022226957A1/en active Application Filing
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| WO2022226957A1 (en) | 2022-11-03 |
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