CN110554477A - Imaging device and electronic device - Google Patents
Imaging device and electronic device Download PDFInfo
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- CN110554477A CN110554477A CN201810550052.4A CN201810550052A CN110554477A CN 110554477 A CN110554477 A CN 110554477A CN 201810550052 A CN201810550052 A CN 201810550052A CN 110554477 A CN110554477 A CN 110554477A
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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
- G02B13/004—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 four 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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The invention discloses an imaging device and an electronic device. The imaging device comprises a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with positive refractive power and a fourth lens element with negative refractive power from an object side to an image side. The object side surface of the first lens is a convex surface. The image side surface of the third lens is a convex surface. Wherein at least one of surfaces of the first lens, the second lens, the third lens, and the fourth lens includes a plane, and the imaging device further includes an infrared cut film disposed on the plane. According to the imaging device, at least one plane is arranged in the first lens, the second lens, the third lens and the fourth lens, and the infrared cut-off film is arranged on the plane, so that the use of an infrared filter is reduced, the height of the whole imaging device is shortened, and the cost is saved. In addition, through the use of the plane, the sensitivity of the imaging device is reduced, and the yield is improved.
Description
Technical Field
The present disclosure relates to optical imaging technologies, and particularly to an imaging device and an electronic device.
background
Currently, an imaging device generally includes a plurality of lenses, and an infrared filter needs to be additionally provided. The infrared filter is used for adjusting the light wavelength section of imaging, and is particularly used for isolating infrared light from entering the photosensitive element, so that the influence of the infrared light on the color and the definition of a normal image is prevented. However, the additional provision of the infrared filter increases the height of the entire imaging device.
Disclosure of Invention
in view of this, the embodiment of the invention provides an imaging device and an electronic device.
the imaging device according to the embodiment of the invention includes, from an object side to an image side, a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with positive refractive power and a fourth lens element with negative refractive power. The object side surface of the first lens is a convex surface. The image side surface of the third lens is a convex surface. Wherein at least one of surfaces of the first lens, the second lens, the third lens, and the fourth lens includes a plane, and the imaging device further includes an infrared cut film disposed on the plane.
According to the imaging device, at least one plane is arranged in the first lens, the second lens, the third lens and the fourth lens, and the infrared cut-off film is arranged on the plane, so that the use of an infrared filter is reduced, the height of the whole imaging device is shortened, and the cost is saved. In addition, through the use of the plane, the sensitivity of the imaging device is reduced, and the yield is improved.
In some embodiments, at least one surface of at least one lens in the imaging device is aspheric.
Thus, the imaging device can effectively reduce the total length of the imaging device by adjusting the curvature radius and the aspheric surface coefficient of the lens surface, and the aberration of the imaging device can be effectively corrected by using the diversified surface types, so that the imaging quality is improved.
In certain embodiments, the imaging device satisfies the following relationship:
-110<fs/f<1；
wherein f is a focal length of the imaging device, and fs is a focal length of a lens including the plane in the imaging device.
When the above relation is satisfied, the lens with the plane has a suitable refractive power to match the configuration of the overall refractive power of the imaging device, which is beneficial to the miniaturization of the imaging device and the correction of the aberration of the imaging device. And the diopter of the lens with the plane can be effectively distributed, which is beneficial to reducing the sensitivity of the imaging device to light and reducing the generation of noise.
In certain embodiments, the imaging device satisfies the following relationship:
0<F23/f<2；
wherein F is a focal length of the imaging device, and F23 is a combined focal length of the second lens and the third lens.
When the above relation is satisfied, the second lens element and the third lens element have suitable refractive powers to match the configuration of the overall refractive power of the imaging device, which is beneficial to correcting aberration and improving the imaging quality of the imaging device. And the reduction of the sensitivity of the imaging device to light rays caused by overlarge diopter of the second lens or the third lens can be avoided, and the condition that the imaging device generates dark corners can be reduced.
In certain embodiments, the imaging device satisfies the following relationship:
2<F34/f<4；
wherein F is a focal length of the imaging device, and F34 is a combined focal length of the third lens and the fourth lens.
When the above relation is satisfied, the third lens element and the fourth lens element have suitable refractive powers to match the configuration of the overall refractive power of the imaging device, which is beneficial to correcting aberration and improving the imaging quality of the imaging device. And the reduction of the sensitivity of the imaging device to light rays caused by overlarge diopter of the third lens or the fourth lens can be avoided, and the condition that the imaging device generates dark corners can be reduced.
In certain embodiments, the imaging device satisfies the following relationship:
5<TTL*f/tan(HFOV)<15；
wherein, TTL is the total length of the imaging device, f is the focal length of the imaging device, and HFOV is half of the field angle of the imaging device.
In this way, on the one hand, the imaging device can be miniaturized to be mounted on a light, thin and portable electronic product; on the other hand, the imaging device can meet the requirement of high pixel, and the problems of low back and dark photographed pictures in a large field angle of the imaging device are solved, so that the usable time and environment of the imaging device are expanded.
In certain embodiments, the imaging device satisfies the following relationship:
(CT1+CT2+CT3+CT4)/SD<3.37；
Wherein CT1 is the central thickness of the first lens, CT2 is the central thickness of the second lens, CT3 is the central thickness of the third lens, CT4 is the central thickness of the fourth lens, and SD is the distance from the image-side surface of the fourth lens to the photosensitive element on the optical axis.
When the relation is satisfied, the thicknesses of the first lens, the second lens and the third lens are proper, so that the manufacturing difficulty can be reduced, the high lens manufacturing yield can be reduced, and the formability and the homogeneity of the lens during injection molding can be facilitated; on the other hand, it is advantageous to shorten the total length of the entire image forming apparatus to promote miniaturization of the image forming apparatus.
in certain embodiments, the imaging device satisfies the following relationship:
D/f>0.47；
Wherein f is a focal length of the imaging device and D is an entrance pupil diameter of the imaging device.
When the relation is satisfied, the energy density of the image side surface can be effectively improved, the signal-to-noise ratio of the output signal of the photosensitive element on the image side is improved, and the imaging quality is improved.
In some embodiments of the present invention, the substrate is,
The image side surface of the second lens is a plane, and the imaging device comprises an infrared cut-off film arranged on the image side surface of the second lens; or
the object side surface of the second lens is a plane, and the imaging device comprises an infrared cut-off film arranged on the object side surface of the second lens; or
the object side surface of the fourth lens is a plane, and the imaging device comprises an infrared cut-off film arranged on the object side surface of the fourth lens; or
The object side surface of the third lens is a plane, and the imaging device comprises an infrared cut-off film arranged on the object side surface of the third lens.
Therefore, the imaging device can flexibly set the infrared cut-off film, and the distance between the adjacent lenses is fully utilized, so that the height of the imaging device is further shortened.
An electronic device according to an embodiment of the present invention includes the image forming apparatus according to any one of the above embodiments and a photosensitive element. The photosensitive element is disposed on an image side of the imaging device.
According to the electronic device, at least one plane is arranged in the first lens, the second lens, the third lens and the fourth lens, and the infrared cut-off film is arranged on the plane, so that the use of an infrared filter is reduced, the height of the whole imaging device is shortened, and the cost is saved. In addition, through the use of the plane, the sensitivity of the imaging device is reduced, and the yield is improved.
Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural view of an imaging apparatus according to a first embodiment of the present invention;
FIG. 2 is a longitudinal aberration diagram (mm) of the imaging system of FIG. 1;
FIG. 3 is a field curvature (mm) view of the imaging system of FIG. 1;
FIG. 4 is a distortion plot (%);
fig. 5 is a schematic structural view of an image forming apparatus according to a second embodiment of the present invention;
FIG. 6 is a longitudinal aberration diagram (mm) of the imaging system of FIG. 5;
FIG. 7 is a field curvature (mm) view of the imaging system of FIG. 5;
FIG. 8 is a distortion map (%) -of the imaging system of FIG. 5;
Fig. 9 is a schematic structural view of an image forming apparatus according to a third embodiment of the present invention;
FIG. 10 is a longitudinal aberration diagram (mm) of the imaging system of FIG. 9;
FIG. 11 is a field curvature (mm) view of the imaging system of FIG. 9;
FIG. 12 is a distortion map (%);
Fig. 13 is a schematic structural view of an image forming apparatus according to a fourth embodiment of the present invention;
FIG. 14 is a longitudinal aberration diagram (mm) of the imaging system of FIG. 13;
FIG. 15 is a field curvature (mm) view of the imaging system of FIG. 13;
FIG. 16 is a distortion map (%);
FIG. 17 is a schematic structural diagram of an electronic device according to an embodiment of the invention;
FIG. 18 is a schematic structural diagram of an electronic device according to an embodiment of the invention; and
fig. 19 is a schematic structural diagram of an electronic device according to another embodiment of the invention.
Detailed Description
reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
the following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
referring to fig. 1, 5, 9 and 13, the imaging device 10 according to the embodiment of the invention includes, from the object side to the image side, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power and a fourth lens element L4 with negative refractive power.
the first lens element L1 has an object-side surface S1 and an image-side surface S2, and the object-side surface S1 of the first lens element L1 is convex. The second lens L2 has an object-side surface S3 and an image-side surface S4. The third lens element L3 has an object-side surface S5 and an image-side surface S6, and the image-side surface S6 of the third lens element L3 is convex. The fourth lens L4 has an object-side surface S7 and an image-side surface S8. At least one of the surfaces of the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 includes a plane, that is, the object-side surface S1 of the first lens L1 is a plane; alternatively, the image-side surface S2 of the first lens element L1 is a plane; alternatively, the object-side surface S3 of the second lens L2 is a plane; alternatively, the image-side surface S4 of the second lens L2 is a plane; alternatively, the object-side surface S5 of the third lens L3 is a plane; alternatively, the image-side surface S6 of the third lens element L3 is a plane; alternatively, the object-side surface S7 of the fourth lens L4 is a plane; alternatively, the image-side surface S8 of the fourth lens element L4 is a plane; alternatively, the object-side surface S1 of the first lens L1 and the object-side surface S3 of the second lens L2 are planar; alternatively, the object-side surface S1 of the first lens L1 and the image-side surface S4 of the second lens L2 are planar; alternatively, the object-side surface S1 of the first lens L1, the object-side surface S3 of the second lens L2, and the object-side surface S5 of the third lens L3 are planar; alternatively, the object-side surface S1 of the first lens L1, the object-side surface S3 of the second lens L2, the object-side surface S5 of the third lens L3, and the object-side surface S7 of the fourth lens L4 are planar, which is not illustrated here. The imaging device 10 further includes an infrared cut film 11 disposed on the plane. The infrared light is filtered through the infrared cut-off film 11, the imaging quality is improved, the imaging device 10 can flexibly set the infrared cut-off film 11, the distance between the adjacent lenses is fully utilized, and therefore the height of the imaging device 10 is further shortened. Among them, the infrared cut film 11 may be provided only on one plane, or may be provided on a plurality of planes, so that the filtering effect on infrared light is enhanced and the miniaturization of the imaging device 10 is not greatly affected. The infrared cut film 11 in fig. 1 is disposed on the image side surface S4 of the second lens L2; the infrared cut film 11 in fig. 5 is disposed on the object side S3 of the second lens L2; the infrared cut film 11 in fig. 9 is disposed on the object side S7 of the fourth lens L4; the infrared cut film 11 in fig. 13 is disposed on the object side S5 of the third lens L3.
in certain embodiments, the imaging device 10 further includes an aperture stop STO. The aperture stop STO may be provided on the surface of any one of the lenses, or before the first lens L1, or between any two of the lenses, or between the fourth lens L4 and the photosensitive element 20 (shown in fig. 17).
when the imaging device 10 is used for imaging, light rays emitted or reflected by the subject OBJ enter the imaging device 10 from the object side direction, pass through the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4, and finally converge on the imaging surface S9.
In the imaging device 10 according to the embodiment of the present invention, at least one of the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 is provided with a plane, and the infrared cut-off film 11 is provided on the plane to reduce the use of the infrared filter, and the infrared cut-off film 11 is directly plated on the surface of the lens and has a thickness far smaller than the thickness of the infrared filter, so that the height of the whole imaging device 10 is reduced, and the cost is saved. In addition, through the use of the plane, the sensitivity of the imaging device 10 is reduced, and the yield is improved.
In certain embodiments, the imaging device 10 satisfies the following relationship:
-110<fs/f<1；
Where f is the focal length of the imaging device 10, and fs is the focal length of a lens including a plane in the imaging device 10.
That is, fs/f can be any value in the interval (-110,1), for example, the value is-105, -90, -80, -60, -55, -40, -30, -20, -10, -5, -4, -3, -2.5, -2, -1.5, -1, -0.8, -0.5, -0.3, -0.2, 0, 0.1, 0.2, 0.25, 0.3, 0.35, 0.5, 0.6, 0.7, 0.8, 0.9, 0.95, etc.
Specifically, if the image-side surface S4 of the second lens element L2 in fig. 1 is a plane, then-110 < f2/f < 1; the object side S3 of the second lens L2 in fig. 5 is a plane, then-110 < f2/f < 1; the object side S7 of the fourth lens element L4 in fig. 9 is a plane, then-110 < f4/f < 1; the object side S5 of the third lens L3 in fig. 13 is a plane, and-110 < f3/f < 1.
When the above relation is satisfied, the lens with a flat surface has a suitable refractive power to match the overall refractive power of the imaging device 10, which is beneficial to miniaturizing the imaging device 10 and correcting the aberration of the imaging device 10. And the diopter of the lens with the plane can be effectively distributed, which is beneficial to reducing the sensitivity of the imaging device 10 to light and reducing noise.
in certain embodiments, the imaging device 10 satisfies the following relationship:
0<F23/f<2；
Where F is the focal length of the imaging device 10, and F23 is the combined focal length of the second lens L2 and the third lens L3.
that is, F23/F may be any value in the interval (0,2), for example, 0.05, 0.1, 0.15, 0.25, 0.4, 0.55, 0.7, 0.85, 1, 1.05, 1.1, 1.15, 1.3, 1.4, 1.45, 1.6, 1.75, 1.9, 1.95, etc.
When the above relationship is satisfied, the second lens element L2 and the third lens element L3 have suitable refractive powers to match the overall refractive power configuration of the imaging device 10, and are favorable for correcting aberrations and improving the imaging quality of the imaging device 10, and can avoid the decrease of the sensitivity of the imaging device 10 to light due to the excessively large refractive power of the second lens element L2 or the third lens element L3, and is favorable for reducing the dark angle generated by the imaging device 10.
In certain embodiments, the imaging device 10 satisfies the following relationship:
2<F34/f<4；
Where F is the focal length of the imaging device 10, and F34 is the combined focal length of the third lens L3 and the fourth lens L4.
That is, F34/F may be any value in the interval (2,4), for example, 2.05, 2.1, 2.15, 2.25, 2.4, 2.55, 2.7, 2.85, 3, 3.05, 3.1, 3.15, 3.3, 3.4, 3.45, 3.6, 3.75, 3.9, 3.95, etc.
When the above-mentioned relational expressions are satisfied, the third lens element L3 and the fourth lens element L4 have suitable refractive powers to match the overall refractive power of the imaging device 10, and are favorable for correcting aberrations and improving the imaging quality of the imaging device 10. And the reduction of the sensitivity of the imaging device 10 to light due to the over-diopter of the third lens L3 or the fourth lens L4 can be avoided, which is beneficial to reducing the dark angle generated by the imaging device 10.
Referring to fig. 17, in some embodiments, the imaging device 10 satisfies the following relation:
5<TTL*f/tan(HFOV)<15；
where TTL is the total length of the imaging device 10, that is, TTL is the distance from the object-side surface S1 of the first lens L1 to the photosensitive element 20 (shown in fig. 17) on the optical axis, f is the focal length of the imaging device 10, and HFOV is half of the field angle of the imaging device 10, that is, half of the field angle in the diagonal direction of the photosensitive element 20 (shown in fig. 17).
That is, TTL × f/tan (hfov) may be any value in the interval (5,15), for example, 5.1, 5.5, 5.7, 6, 7, 9, 9.5, 10, 10.2, 11, 11.5, 12, 12.5, 13, 13.4, 14, 14.5, 14.9, and the like.
In this way, on the one hand, the imaging apparatus 10 can be miniaturized to be mounted on a light, thin, and portable electronic product; on the other hand, the imaging apparatus 10 can be made to meet the demand for high pixels, solving the problem that the imaging apparatus 10 has low back and a dark photographed picture in a large field angle, thereby expanding the time and environment in which the imaging apparatus 10 can be used.
In certain embodiments, the imaging device 10 satisfies the following relationship:
(CT1+CT2+CT3+CT4)/SD<3.37；
Wherein CT1 is the central thickness of the first lens L1, CT2 is the central thickness of the second lens L2, CT3 is the central thickness of the third lens L3, CT4 is the central thickness of the fourth lens L4, and SD is the distance between the image-side surface S8 of the fourth lens L4 and the photosensitive element 20 (shown in fig. 17) on the optical axis.
That is, (CT1+ CT2+ CT3+ CT4)/SD can be any value less than 3.37, for example, 0.5, 1, 1.25, 1.5, 1.7, 1.9, 2, 2.2, 2.4, 2.8, 2.9, 3, 3.1, 3.15, 3.2, 3.3, 3.35, and the like.
When the above relation is satisfied, the thicknesses of the first lens L1 to the fourth lens L4 are appropriate, which reduces the difficulty in manufacturing and increases the yield of lens manufacture, and is beneficial to the moldability and homogeneity of the lens during injection molding; on the other hand, it is advantageous to shorten the overall length of the entire image forming apparatus 10 to promote miniaturization of the image forming apparatus 10.
In certain embodiments, the imaging device 10 satisfies the following relationship:
D/f>0.47；
Where f is the focal length of the imaging device 10 and D is the entrance pupil diameter of the imaging device 10.
that is, D/f may be any value greater than 0.47, for example, the value may be 0.475, 0.48, 0.5, 0.8, 1, 1.2, 1.5, 2, 2.5, 3, 4, etc.
when the above-mentioned relational expression is satisfied, the energy density of the image side surface can be effectively improved, and the signal-to-noise ratio of the output signal of the image side photosensitive element 20 (shown in fig. 17) can be improved, thereby improving the imaging quality.
In some embodiments, the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 are all made of plastic.
since the first lens L1 to the fourth lens L4 are all plastic lenses, the imaging device 10 can realize ultra-thinning and has low cost while effectively eliminating aberration and satisfying high pixel requirements.
in some embodiments, at least one surface of at least one lens in the imaging device 10 is aspheric. For example, in embodiment 1, the object-side surface S1 and the image-side surface S2 of the first lens L1 are aspheric, the object-side surface S3 of the second lens L2 is aspheric, the image-side surface S4 of the second lens L2 is spherical, the object-side surface S5 and the image-side surface S6 of the third lens L3 are aspheric, and the object-side surface S7 and the image-side surface S8 of the fourth lens L4 are aspheric.
In some embodiments, the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 are all aspherical mirrors. The aspherical surface has a surface shape determined by the following formula:
Wherein Z is the longitudinal distance between any point on the aspheric surface and the surface vertex, r is the distance between any point on the aspheric surface and the optical axis, c is the vertex curvature (the reciprocal of the curvature radius), k is the conic constant, and Ai is the correction coefficient of the i-th order of the aspheric surface.
in this way, the imaging device 10 can effectively reduce the total length of the imaging device 10 by adjusting the curvature radius and the aspheric coefficient of each lens surface, and can effectively correct the aberration of the imaging device 10 to improve the imaging quality.
The first embodiment is as follows:
referring to fig. 1, in the first embodiment, the first lens element L1 has positive refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has positive refractive power, and the fourth lens element L4 has negative refractive power.
The object-side surface S1 is convex, the image-side surface S2 is concave at the optical axis, and the image-side surface S2 is convex at the circumference. Object-side surface S3 is concave and image-side surface S4 is planar. The object-side surface S5 is concave and the image-side surface S6 is convex. The object-side surface S7 is convex at the optical axis, the object-side surface S7 is concave at the circumference, the image-side surface S8 is concave at the optical axis, and the image-side surface S8 is convex at the circumference. Further, image side S8 may include at least two points of inflection. In this way, the angle at which the light rays of the off-axis field are incident on the photosensitive element 20 (shown in FIG. 17) can be effectively suppressed, thereby correcting the aberration of the off-axis field.
Referring to fig. 1 to 4, the imaging apparatus 10 satisfies the conditions of the following tables:
TABLE 1
in table 1, f is the effective focal length of the imaging device 10, fno is the focal ratio of the imaging device 10, and HFOV is half the field angle of the imaging device 10.
TABLE 2
Example two
referring to fig. 5, in the second embodiment, the first lens element L1 has positive refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has positive refractive power, and the fourth lens element L4 has negative refractive power.
Object side S1 is convex, and image side S2 is concave. Object-side surface S3 is planar and image-side surface S4 is concave. The object-side surface S5 is concave and the image-side surface S6 is convex. The object-side surface S7 is convex at the optical axis, the object-side surface S7 is concave at the circumference, the image-side surface S8 is concave at the optical axis, and the image-side surface S8 is convex at the circumference. Further, image side S8 may include at least two points of inflection. In this way, the angle at which the light rays of the off-axis field are incident on the photosensitive element 20 (shown in FIG. 17) can be effectively suppressed, thereby correcting the aberration of the off-axis field.
Referring to fig. 5 to 8, the imaging apparatus 10 satisfies the conditions of the following tables:
TABLE 3
In table 3, f is the effective focal length of the imaging device 10, fno is the focal ratio of the imaging device 10, and HFOV is half the field angle of the imaging device 10.
TABLE 4
EXAMPLE III
referring to fig. 9, in the third embodiment, the first lens element L1 has positive refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has positive refractive power, and the fourth lens element L4 has negative refractive power.
The object-side surface S1 is convex, the image-side surface S2 is concave at the optical axis, and the image-side surface S2 is convex at the circumference. The object-side surface S3 is concave and the image-side surface S4 is convex. The object-side surface S5 is concave and the image-side surface S6 is convex. The object-side surface S7 is a plane, the image-side surface S8 is concave at the optical axis, and the image-side surface S8 is convex at the circumference. Further, image side S8 may include at least two points of inflection. In this way, the angle at which the light rays of the off-axis field are incident on the photosensitive element 20 (shown in FIG. 17) can be effectively suppressed, thereby correcting the aberration of the off-axis field.
Referring to fig. 9 to 12, the imaging apparatus 10 satisfies the conditions of the following tables:
TABLE 5
In table 5, f is the effective focal length of the imaging device 10, fno is the focal ratio of the imaging device 10, and HFOV is half the field angle of the imaging device 10.
TABLE 6
example four
Referring to fig. 13, in the third embodiment, the first lens element L1 has positive refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has positive refractive power, and the fourth lens element L4 has negative refractive power.
The object-side surface S1 is convex, and the image-side surface S2 is convex. The object-side surface S3 is concave, the image-side surface S4 is convex with respect to the optical axis, and the image-side surface S4 is concave with respect to the circumference. The object-side surface S5 is a plane surface, and the image-side surface S6 is a convex surface. The object-side surface S7 is convex, the image-side surface S8 is concave at the optical axis, and the image-side surface S8 is convex at the circumference. Further, image side S8 may include at least two points of inflection. In this way, the angle at which the light rays of the off-axis field are incident on the photosensitive element 20 (shown in FIG. 17) can be effectively suppressed, thereby correcting the aberration of the off-axis field.
referring to fig. 13 to 16, the imaging apparatus 10 satisfies the conditions of the following tables:
TABLE 7
In table 7, f is the effective focal length of the imaging device 10, fno is the focal ratio of the imaging device 10, and HFOV is half the field angle of the imaging device 10.
TABLE 8
Referring to fig. 17, 18 and 19, an electronic device 100 according to an embodiment of the present invention includes the imaging device 10 and the photosensitive element 20 according to any one of the embodiments. The photosensitive element 20 is disposed on the image side of the imaging device 10.
The photosensitive element 20 may be a Complementary Metal Oxide Semiconductor (CMOS) photosensitive element or a Charge-coupled Device (CCD) photosensitive element.
In the electronic device 100 according to the embodiment of the invention, at least one of the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 is provided with a plane, and the infrared cut-off film 11 is provided on the plane, so that the use of an infrared filter is reduced, the height of the whole imaging device 10 is shortened, and the cost is saved. In addition, through the use of the plane, the sensitivity of the imaging device 10 is reduced, and the yield is improved.
The electronic device 100 according to the embodiment of the present invention includes, but is not limited to, information terminal devices such as a smart phone (as shown in fig. 18), a mobile phone, a Personal Digital Assistant (PDA), a game machine, a Personal Computer (PC), a camera, a smart watch, a tablet PC (fig. 19), and home appliances having a photographing function.
In the description of the specification, reference to the terms "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments within the scope of the present invention, which is defined by the claims and their equivalents.
Claims (10)
1. An imaging apparatus, comprising from an object side to an image side:
A first lens element with positive refractive power having a convex object-side surface;
A second lens element with negative refractive power;
a third lens element with positive refractive power having a convex image-side surface; and
A fourth lens element with negative refractive power;
Wherein at least one of surfaces of the first lens, the second lens, the third lens, and the fourth lens includes a plane, and the imaging device further includes an infrared cut film disposed on the plane.
2. The imaging apparatus of claim 1, wherein at least one surface of at least one lens in the imaging apparatus is aspheric.
3. The imaging apparatus according to claim 1, wherein the imaging apparatus satisfies the following relational expression:
-110<fs/f<1；
Wherein f is a focal length of the imaging device, and fs is a focal length of a lens including the plane in the imaging device.
4. The imaging apparatus according to claim 1, wherein the imaging apparatus satisfies the following relational expression:
0<F23/f<2；
Wherein F is a focal length of the imaging device, and F23 is a combined focal length of the second lens and the third lens.
5. The imaging apparatus according to claim 1, wherein the imaging apparatus satisfies the following relational expression:
2<F34/f<4；
Wherein F is a focal length of the imaging device, and F34 is a combined focal length of the third lens and the fourth lens.
6. The imaging apparatus according to claim 1, wherein the imaging apparatus satisfies the following relational expression:
5<TTL*f/tan(HFOV)<15；
Wherein, TTL is the total length of the imaging device, f is the focal length of the imaging device, and HFOV is half of the field angle of the imaging device.
7. The imaging apparatus according to claim 1, wherein the imaging apparatus satisfies the following relational expression:
(CT1+CT2+CT3+CT4)/SD<3.37；
Wherein CT1 is the central thickness of the first lens, CT2 is the central thickness of the second lens, CT3 is the central thickness of the third lens, CT4 is the central thickness of the fourth lens, and SD is the distance from the image-side surface of the fourth lens to the photosensitive element on the optical axis.
8. the imaging apparatus according to claim 1, wherein the imaging apparatus satisfies the following relational expression:
D/f>0.47；
Wherein f is a focal length of the imaging device and D is an entrance pupil diameter of the imaging device.
9. The imaging apparatus of claim 1, wherein the image side surface of the second lens is a plane surface, the imaging apparatus comprising an infrared cut film disposed on the image side surface of the second lens; or
The object side surface of the second lens is a plane, and the imaging device comprises an infrared cut-off film arranged on the object side surface of the second lens; or
The object side surface of the fourth lens is a plane, and the imaging device comprises an infrared cut-off film arranged on the object side surface of the fourth lens; or
The object side surface of the third lens is a plane, and the imaging device comprises an infrared cut-off film arranged on the object side surface of the third lens.
10. An electronic device, comprising:
The imaging device of any one of claims 1-9; and
a photosensitive element disposed on an image side of the imaging device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810550052.4A CN110554477A (en) | 2018-05-31 | 2018-05-31 | Imaging device and electronic device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810550052.4A CN110554477A (en) | 2018-05-31 | 2018-05-31 | Imaging device and electronic device |
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| CN110554477A true CN110554477A (en) | 2019-12-10 |
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| CN201810550052.4A Withdrawn CN110554477A (en) | 2018-05-31 | 2018-05-31 | Imaging device and electronic device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111856732A (en) * | 2020-09-19 | 2020-10-30 | 瑞泰光学(常州)有限公司 | Image pickup optical lens |
| WO2021138760A1 (en) * | 2020-01-06 | 2021-07-15 | 南昌欧菲精密光学制品有限公司 | Optical imaging system and image capturing device having same, and electronic device |
| TWI826952B (en) * | 2022-02-25 | 2023-12-21 | 大陸商玉晶光電（廈門）有限公司 | Optical imaging lens |
-
2018
- 2018-05-31 CN CN201810550052.4A patent/CN110554477A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021138760A1 (en) * | 2020-01-06 | 2021-07-15 | 南昌欧菲精密光学制品有限公司 | Optical imaging system and image capturing device having same, and electronic device |
| CN111856732A (en) * | 2020-09-19 | 2020-10-30 | 瑞泰光学(常州)有限公司 | Image pickup optical lens |
| CN111856732B (en) * | 2020-09-19 | 2020-12-04 | 瑞泰光学(常州)有限公司 | Image pickup optical lens |
| WO2022057050A1 (en) * | 2020-09-19 | 2022-03-24 | 诚瑞光学(深圳)有限公司 | Camera optical lens |
| TWI826952B (en) * | 2022-02-25 | 2023-12-21 | 大陸商玉晶光電（廈門）有限公司 | Optical imaging lens |
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Address after: 330096 No.699 Tianxiang North Avenue, Nanchang hi tech Industrial Development Zone, Nanchang City, Jiangxi Province Applicant after: Jiangxi Jingchao optics Co.,Ltd. Address before: 330096 Jiangxi Nanchang Nanchang hi tech Industrial Development Zone, east of six road, south of Tianxiang Avenue. Applicant before: NANCHANG OUFEI PRECISION OPTICAL PRODUCT Co.,Ltd. |
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Application publication date: 20191210 |