CN211928285U - Optical imaging system - Google Patents
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- CN211928285U CN211928285U CN202020320151.6U CN202020320151U CN211928285U CN 211928285 U CN211928285 U CN 211928285U CN 202020320151 U CN202020320151 U CN 202020320151U CN 211928285 U CN211928285 U CN 211928285U
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Abstract
An optical imaging system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. At least one of the first lens element to the fifth lens element has positive refractive power. The fifth lens element with negative refractive power has two aspheric surfaces, and at least one of the surfaces of the fifth lens element has an inflection point. The lens elements with refractive power in the optical imaging system are the first lens element to the fifth lens element. When the specific conditions are met, the optical imaging device can have larger light receiving capacity and better optical path adjusting capacity so as to improve the imaging quality.
Description
Technical Field
The present invention relates to an optical imaging system, and more particularly to a miniaturized optical imaging system applied to an electronic product.
Background
In recent years, with the rise of portable electronic products with a photographing function, the demand of an optical system is increasing. The photosensitive elements of a general optical system are not limited to a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor (CMOS) Sensor, and with the progress of Semiconductor manufacturing technology, the pixel size of the photosensitive elements is reduced, and the optical system is gradually developed in a direction of high pixel, so that the requirements for imaging quality are increasing.
The conventional optical system mounted on the portable device mostly adopts a three-piece or four-piece lens structure, however, as the portable device is continuously developed towards the pixel lifting direction, and the demands of the terminal consumers for large apertures are also continuously increased, such as the low-light and night-shooting functions, the conventional optical imaging system cannot meet the higher-order photographing requirements. Therefore, how to effectively increase the light-entering amount of the optical imaging lens and further improve the imaging quality becomes a very important issue.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a mode appearance is to an optical imaging system and optical image capture camera lens, can utilize the combination of the refractive power of five lenses, convex surface and concave surface (convex surface or concave surface mean in principle the object side or the description that the image side changes apart from the not geometric shape of optical axis co-altitude of each lens), and then effectively improve optical imaging system's the light inlet quantity, improve the imaging quality simultaneously to be applied to on miniature electronic product.
The embodiment of the present invention relates to the following terms and their code numbers of the lens parameters, which are used as the reference for the following description:
lens parameters related to length or height
The imaging height of the optical imaging system is represented by HOI; the height of the optical imaging system is denoted by HOS; the distance between the object side surface of the first lens and the image side surface of the fifth lens of the optical imaging system is represented by InTL; the distance between a fixed diaphragm (aperture) of the optical imaging system and an imaging surface is represented by InS; the distance between the first lens and the second lens of the optical imaging system is denoted (exemplified) by IN 12; the thickness of the first lens of the optical imaging system on the optical axis is denoted by TP1 (illustrated).
Material dependent lens parameters
The abbe number of the first lens of the optical imaging system is denoted (exemplified) by NA 1; the refractive law of the first lens is denoted by Nd1 (for example).
Viewing angle dependent lens parameters
The viewing angle is denoted AF; half of the viewing angle is denoted by HAF; the chief ray angle is denoted MRA.
Lens parameters related to entrance and exit pupils
The entrance pupil diameter of the optical imaging system is denoted by HEP; the exit pupil of the optical imaging system refers to an image formed by an aperture diaphragm passing through a lens group behind the aperture diaphragm in an image space, and the diameter of the exit pupil is expressed by HXP; the maximum Effective radius of any surface of a single lens refers to the vertical height between the intersection point (Effective halo Diameter; EHD) of the light rays incident on the system at the maximum viewing angle and passing through the extreme edge of the entrance pupil and the optical axis. For example, the maximum effective radius of the object-side surface of the first lens is indicated by EHD11 and the maximum effective radius of the image-side surface of the first lens is indicated by EHD 12. The maximum effective radius of the object-side surface of the second lens is indicated by EHD21 and the maximum effective radius of the image-side surface of the second lens is indicated by EHD 22. The maximum effective radius of any surface of the remaining lenses in the optical imaging system is expressed and so on.
Parameters related to lens profile depth
The distance between the intersection point of the object-side surface of the fifth lens on the optical axis and the end point of the maximum effective radius of the object-side surface of the fifth lens, which is horizontal to the optical axis, is represented by InRS51 (depth of maximum effective radius); the distance between the intersection point of the image-side surface of the fifth lens element on the optical axis and the end point of the maximum effective radius of the image-side surface of the fifth lens element, which is horizontal to the optical axis, is represented by InRS52 (depth of maximum effective radius). The depth (amount of depression) of the maximum effective radius of the object-side or image-side surface of the other lens is expressed in a manner comparable to that described above.
Parameters relating to lens surface shape
The critical point C refers to a point on the surface of the particular lens that is tangent to a tangent plane perpendicular to the optical axis, except for the intersection with the optical axis. For example, the perpendicular distance between the critical point C41 of the object-side surface of the fourth lens element and the optical axis is HVT41 (for example), the perpendicular distance between the critical point C42 of the image-side surface of the fourth lens element and the optical axis is HVT42 (for example), the perpendicular distance between the critical point C51 of the object-side surface of the fifth lens element and the optical axis is HVT51 (for example), and the perpendicular distance between the critical point C52 of the image-side surface of the fifth lens element and the optical axis is HVT52 (for example). The representation of the critical point on the object-side or image-side surface of the other lens and its perpendicular distance from the optical axis is comparable to the above.
The inflection point on the object-side surface of the fifth lens closest to the optical axis is IF511, the amount of this point depression SGI511 (for example), SGI511 is the horizontal displacement distance parallel to the optical axis between the intersection point of the object-side surface of the fifth lens on the optical axis and the inflection point on the object-side surface of the fifth lens closest to the optical axis, and the vertical distance between this point of IF511 and the optical axis is HIF511 (for example). The inflection point on the image-side surface of the fifth lens closest to the optical axis is IF521, the amount of depression of the inflection point SGI521 (for example), SGI511 is the horizontal displacement distance parallel to the optical axis between the intersection point of the image-side surface of the fifth lens on the optical axis and the inflection point on the image-side surface of the fifth lens closest to the optical axis, and the vertical distance between the point of the IF521 and the optical axis is HIF521 (for example).
The inflection point on the object-side surface of the fifth lens second closest to the optical axis is IF512, the depression of the point SGI512 (for example), SGI512 is the horizontal displacement distance parallel to the optical axis from the intersection point of the object-side surface of the fifth lens on the optical axis to the inflection point on the object-side surface of the fifth lens second closest to the optical axis, and the vertical distance between the point of IF512 and the optical axis is HIF512 (for example). The second inflection point on the image-side surface of the fifth lens element near the optical axis is IF522, the amount of this point depression SGI522 (for example), SGI522 is the horizontal displacement distance parallel to the optical axis between the intersection point of the image-side surface of the fifth lens element on the optical axis and the second inflection point on the image-side surface of the fifth lens element near the optical axis, and the vertical distance between this point of IF522 and the optical axis is HIF522 (for example).
The third inflection point on the object-side surface of the fifth lens near the optical axis is IF513, the depression amount SGI513 (for example) is the horizontal displacement distance parallel to the optical axis between the SGI513, i.e., the intersection point of the object-side surface of the fifth lens on the optical axis, and the third inflection point on the object-side surface of the fifth lens near the optical axis, and the vertical distance between the point of the IF513 and the optical axis is HIF513 (for example). The inflection point on the image-side surface of the fifth lens closest to the optical axis is IF523, the amount of this point depression SGI523 (for example), SGI523 is the horizontal displacement distance parallel to the optical axis from the intersection point of the image-side surface of the fifth lens on the optical axis to the inflection point on the image-side surface of the fifth lens closest to the optical axis, and the vertical distance between this point of the IF523 and the optical axis is HIF523 (for example).
The fourth inflection point on the object-side surface of the fifth lens near the optical axis is IF514, the depression amount SGI514 (for example) is the horizontal displacement distance parallel to the optical axis between the intersection point of the object-side surface of the fifth lens on the optical axis and the fourth inflection point on the object-side surface of the fifth lens near the optical axis, and the vertical distance between the point of the IF514 and the optical axis is HIF514 (for example). The fourth inflection point on the image-side surface of the fifth lens element near the optical axis is IF524, the depression amount SGI524 (for example), SGI524 is the horizontal displacement distance parallel to the optical axis between the intersection point of the image-side surface of the fifth lens element on the optical axis and the fourth inflection point on the image-side surface of the fifth lens element near the optical axis, and the vertical distance between the point of the IF524 and the optical axis is HIF524 (for example).
The representation of the inflection points on the object-side surface or the image-side surface of the other lens and the vertical distance between the inflection points and the optical axis or the amount of the depression of the inflection points is compared with the representation in the foregoing.
Aberration-related variable
Optical Distortion (Optical Distortion) of an Optical imaging system is expressed in ODT; its TV Distortion (TV Distortion) is expressed in TDT and can further define the degree of aberration shift described between imaging 50% to 100% field of view; the spherical aberration offset is expressed as DFS; the coma aberration offset is denoted by DFC.
The Modulation Transfer Function (MTF) of the optical imaging system is used to test and evaluate the contrast and sharpness of the system image. The vertical axis of the modulation transfer function characteristic diagram indicates the contrast ratio (value from 0 to 1), and the horizontal axis indicates the spatial frequency (cycles/mm; lp/mm; line papers per mm). A perfect imaging system can theoretically present 100% of the line contrast of the subject, whereas a practical imaging system has a contrast transfer ratio value of less than 1 on the vertical axis. Furthermore, in general, the imaged edge regions may be more difficult to obtain a fine degree of reduction than the central region. In the visible spectrum, on the imaging plane, the contrast transfer rates (MTF values) of the optical axis, the field of view 0.3 and the field of view 0.7 at the spatial frequency of 55cycles/mm are respectively represented by MTFE0, MTFE3 and MTFE7, the contrast transfer rates (MTF values) of the optical axis, the field of view 0.3 and the field of view 0.7 at the spatial frequency of 110cycles/mm are respectively represented by MTFQ0, MTFQ3 and MTFQ7, the contrast transfer rates (MTF values) of the optical axis, the field of view 0.3 and the field of view 0.7 at the spatial frequency of 220cycles/mm are respectively represented by MTFH0, MTFH3 and MTFH7, and the contrast transfer rates (MTF values) of the optical axis, the field of view 0.3 and the field of view 0.7 at the spatial frequency of 440cycles/mm are respectively represented by MTF0, MTF3 and MTF 7. If the optical imaging system is designed to have a Pixel Size (Pixel Size) of the photosensitive element below 1.12 μm, the quarter spatial frequency, half spatial frequency (half frequency) and full spatial frequency (full frequency) of the modulation transfer function characteristic map are at least 110cycles/mm, 220cycles/mm and 440cycles/mm, respectively.
If the optical imaging system needs to meet the imaging requirements for the infrared spectrum, such as night vision requirements for low-light sources, the used operating wavelength can be 850nm or 800nm, and since the main function is to identify the object contour formed by black and white light and shade, high resolution is not required, it is only necessary to select a spatial frequency less than 110cycles/mm to evaluate whether the performance of the specific optical imaging system in the infrared spectrum is excellent. When the operating wavelength is 850nm and the image is focused on the image plane, the contrast transfer ratios (MTF values) of the image at the spatial frequency of 55cycles/mm in the optical axis, 0.3 field and 0.7 field are respectively expressed by MTFI0, MTFI3 and MTFI 7. However, since the difference between the infrared operating wavelength of 850nm or 800nm and the common visible light wavelength is very large, it is difficult to design the optical imaging system to focus on both visible light and infrared (dual mode) and achieve certain performance.
The utility model provides an optical imaging system, the object side or the image side of its fifth lens are provided with anti-curved point, can effectively adjust each visual field and incide in the angle of fifth lens to revise to optics distortion and TV distortion. In addition, the surface of the fifth lens can have better optical path adjusting capability so as to improve the imaging quality.
The present invention provides an optical imaging system, which comprises a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and an image plane in order from an object side to an image side. The first lens element is made of glass, at least one of the second lens element to the fifth lens element is made of plastic, at least one of the first lens element to the fifth lens element has positive refractive power, focal lengths of the first lens element to the fifth lens element are f1, f2, f3, f4 and f5, respectively, a focal length of the optical imaging system is f, an entrance pupil diameter of the optical imaging system is HEP, a distance from an object side surface of the first lens element to an image plane of the first lens element is HOS, a distance from the object side surface of the first lens element to an image side surface of the fifth lens element on an optical axis is InTL, the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the image plane, thicknesses of the first lens element to the fifth lens element from 1/2HEP height and parallel to the optical axis are ETP3, ETP2, ETP 84, ETP4 and ETP5, respectively, a total sum of the first lens element to the second lens element is ETP 855, and a total thickness of the first lens element from the first lens element to the fifth lens element from the optical axis 1 to the optical axis is 1, TP2, TP3, TP4 and TP5, the sum of the aforementioned TP1 to TP5 being STP, which satisfies the following conditions: f/HEP is more than or equal to 1.0 and less than or equal to 10; HOS/f is more than or equal to 0.5 and less than or equal to 3; and 0.5 is less than or equal to SETP/STP <1.
According to another aspect of the present invention, an optical imaging system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and an image plane. The first lens is made of glass, the object side surface and the image side surface are both planes, and at least one of the second lens to the fifth lens is made of plastic. Focal lengths of the first lens element to the fifth lens element are f1, f2, f3, f4 and f5, respectively, a focal length of the optical imaging system is f, an entrance pupil diameter of the optical imaging system is HEP, a distance on an optical axis from an object-side surface of the first lens element to the image plane is HOS, a distance on the optical axis from an object-side surface of the first lens element to an image-side surface of the fifth lens element is InTL, a horizontal distance parallel to the optical axis between a coordinate point at a height of 1/2HEP on the object-side surface of the first lens element and the image plane is ETL, a horizontal distance parallel to the optical axis between a coordinate point at a height of 1/2HEP on the object-side surface of the first lens element and a coordinate point at a height of 1/2HEP on the image-side surface of the fifth lens element is EIN, and the following conditions are satisfied: f/HEP is more than or equal to 1.0 and less than or equal to 10; HOS/f is more than or equal to 0.5 and less than or equal to 3; and EIN/ETL is more than or equal to 0.2 and less than 1.
According to another aspect of the present invention, an optical imaging system includes, in order from an object side to an image side, a mechanism light inlet and a first lens; the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and an imaging surface. Wherein the mechanical aperture has a diameter DDH, a first lens element is made of glass, an object-side surface and an image-side surface are both flat surfaces, focal lengths from the first lens element to the fifth lens element are respectively f1, f2, f3, f4 and f5, a focal length from the optical imaging system is f, an entrance pupil diameter of the optical imaging system is HEP, a distance from the object-side surface of the first lens element to the image-side surface of the fifth lens element on the optical axis is HOS, a distance from the object-side surface of the first lens element to the image-side surface of the fifth lens element on the optical axis is ittl, the optical imaging system has a maximum imaging height HOI on the image-side surface perpendicular to the optical axis, a horizontal distance parallel to the optical axis between a coordinate point at a height of 1/2HEP on the object-side surface of the first lens element and a coordinate point at a height of 1/2HEP on the image-side surface of the fifth lens element on the optical axis is EIN plane parallel to the horizontal distance parallel to the optical axis, it satisfies the following conditions: f/HEP is more than or equal to 1.0 and less than or equal to 10; HOS/f is more than or equal to 0.5 and less than or equal to 3; DDH is less than or equal to 10mm, and EIN/ETL is less than or equal to 0.2 and less than 1.
The thickness of the single lens at 1/2 of the height of the entrance pupil diameter (HEP) particularly affects the ability of the shared field of view of each ray within the 1/2 of the entrance pupil diameter (HEP) to correct the aberration and the optical path difference between the rays of each field of view, and the larger the thickness, the higher the ability to correct the aberration is, but at the same time, the difficulty of manufacturing is increased, so the proportional relationship (ETP/TP) between the thickness of the single lens at 1/2 of the height of the entrance pupil diameter (HEP) and the Thickness (TP) of the lens on the optical axis belonging to the surface must be controlled. For example, the thickness of the first lens at 1/2 of the entrance pupil diameter (HEP) height is indicated by ETP 1. The thickness of the second lens at 1/2 of the entrance pupil diameter (HEP) height is indicated by ETP 2. The thickness of the remaining lenses in the optical imaging system is at 1/2 of the entrance pupil diameter (HEP) height, which is expressed by the same way and so on. The sum of ETP1 to ETP5 is SETP, and the embodiments of the present invention can satisfy the following formula: SETP/EIN is more than or equal to 0.3 and less than 1.
In order to balance the improvement of aberration correction capability and the reduction of manufacturing difficulty, it is particularly desirable to control the ratio (ETP/TP) between the thickness (ETP) of the lens at 1/2 of the height of the entrance pupil diameter (HEP) and the Thickness (TP) of the lens on the optical axis. For example, the thickness of the first lens at 1/2 of the height of the entrance pupil diameter (HEP) is represented by ETP1, the thickness of the first lens on the optical axis is TP1, and the ratio of the two is ETP1/TP 1. The thickness of the second lens at 1/2 of the entrance pupil diameter (HEP) height is represented by ETP2, and the thickness of the second lens on the optical axis is TP2, the ratio of the two is ETP2/TP 2. The proportional relationship between the thickness of the remaining lenses in the optical imaging system at 1/2 of the height of the entrance pupil diameter (HEP) and the thickness of the lens on the optical axis (TP) is expressed by analogy. The embodiment of the utility model can satisfy following formula: ETP/TP is more than or equal to 0.2 and less than or equal to 3.
The horizontal distance between two adjacent lenses at 1/2 of the height of the entrance pupil diameter (HEP) is represented by ED, and the horizontal distance (ED) is parallel to the optical axis of the optical imaging system, and particularly affects the ability of the 1/2 of the entrance pupil diameter (HEP) position to correct the aberration in the shared area of each light field and the optical path difference between the light beams in each field, and the larger the horizontal distance, the higher the ability to correct the aberration is, the more difficult the production and manufacturing process is increased, and the degree of "shrinkage" of the length of the optical imaging system is limited, so that the horizontal distance (ED) between two adjacent lenses at 1/2 of the height of the entrance pupil diameter (HEP) must be controlled.
IN order to balance the difficulty of improving the aberration correction capability and reducing the length "shrink" of the optical imaging system, it is particularly necessary to control the ratio (ED/IN) between the horizontal distance (ED) of the two adjacent lenses at 1/2 of the height of the entrance pupil diameter (HEP) and the horizontal distance (IN) of the two adjacent lenses on the optical axis. For example, the horizontal distance between the first lens and the second lens at 1/2 of the height of the entrance pupil diameter (HEP) is represented as ED12, the horizontal distance between the first lens and the second lens on the optical axis is IN12, and the ratio of the two is ED12/IN 12. The horizontal distance between the second lens and the third lens at 1/2 of the height of the entrance pupil diameter (HEP) is represented as ED23, and the horizontal distance between the second lens and the third lens on the optical axis is ED23, and the ratio of the two is ED23/IN 23. The proportional relation between the horizontal distance of the rest two adjacent lenses in the optical imaging system at the height of 1/2 of the entrance pupil diameter (HEP) and the horizontal distance of the two adjacent lenses on the optical axis is expressed in the same way.
The horizontal distance that is on a parallel with the optical axis between the coordinate point of 1/2HEP height to this imaging surface on this fifth lens looks like the side is EBL, and the horizontal distance that is on a parallel with the optical axis with the nodical to this imaging surface of optical axis on this fifth lens looks like the side is BL, the embodiment of the utility model discloses an for balance simultaneously promote the ability of revising the aberration and reserve the accommodation space of other optical element, can satisfy following formula: EBL/BL is more than or equal to 0.2 and less than 1. The optical imaging system may further include a filter element, the filter element is located between the fifth lens element and the imaging plane, the distance between the coordinate point of 1/2HEP height on the image side surface of the fifth lens element and the optical axis is EIR, the distance between the intersection point of the image side surface of the fifth lens element and the optical axis and the distance between the intersection point of the optical axis and the filter element and the optical axis is PIR, the following formula can be satisfied by embodiments of the present invention: EIR/PIR is more than or equal to 0.1 and less than 1.
When f1 | > f5, the total Height (HOS) of the optical imaging System can be reduced to achieve miniaturization.
When | f2 | + -f 3 | + | f4 |, and | f1 | + | f5 |, satisfy the above conditions, at least one of the second lens element to the fourth lens element has weak positive refractive power or weak negative refractive power. The term "weak refractive power" refers to a focal length of a particular lens element having an absolute value greater than 10. When the present invention discloses at least one lens element of the second lens element to the fourth lens element has weak positive refractive power, the lens element can effectively share the positive refractive power of the first lens element to avoid the occurrence of unnecessary aberration too early, otherwise, the aberration of the correction system can be finely adjusted if at least one lens element of the second lens element to the fourth lens element has weak negative refractive power.
In addition, the fifth lens element with negative refractive power has a concave image-side surface. Thus, it is advantageous to shorten the back focal length to maintain miniaturization. In addition, at least one surface of the fifth lens can be provided with at least one point of inflection, which can effectively suppress the incident angle of the light rays in the off-axis field of view and further correct the aberration of the off-axis field of view.
Drawings
The above and other features of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1A is a schematic view of an optical imaging system according to a first embodiment of the present invention;
fig. 1B is a graph showing spherical aberration, astigmatism and optical distortion of the optical imaging system according to the first embodiment of the present invention from left to right in sequence;
fig. 1C is a diagram showing the visible spectrum modulation conversion characteristics of the optical imaging system according to the first embodiment of the present invention;
fig. 2A is a schematic view of an optical imaging system according to a second embodiment of the present invention;
fig. 2B is a graph showing the spherical aberration, astigmatism and optical distortion of the optical imaging system according to the second embodiment of the present invention from left to right in sequence;
fig. 2C is a diagram showing the visible spectrum modulation conversion characteristic of the optical imaging system according to the second embodiment of the present invention;
fig. 3A is a schematic view of an optical imaging system according to a third embodiment of the present invention;
fig. 3B is a graph showing the spherical aberration, astigmatism and optical distortion of the optical imaging system according to the third embodiment of the present invention from left to right in sequence;
fig. 3C is a diagram showing the visible spectrum modulation conversion characteristics of the optical imaging system according to the third embodiment of the present invention;
fig. 4A is a schematic view of an optical imaging system according to a fourth embodiment of the present invention;
fig. 4B is a graph showing the spherical aberration, astigmatism and optical distortion of the optical imaging system according to the fourth embodiment of the present invention from left to right in sequence;
fig. 4C is a diagram showing the visible spectrum modulation conversion characteristic of the optical imaging system according to the fourth embodiment of the present invention;
fig. 5A is a schematic view of an optical imaging system according to a fifth embodiment of the present invention;
fig. 5B is a graph showing the spherical aberration, astigmatism and optical distortion of the optical imaging system according to the fifth embodiment of the present invention from left to right in sequence;
fig. 5C is a diagram showing the visible spectrum modulation conversion characteristics of the optical imaging system according to the fifth embodiment of the present invention;
fig. 6A is a schematic view of an optical imaging system according to a sixth embodiment of the present invention;
fig. 6B is a graph showing spherical aberration, astigmatism and optical distortion of the optical imaging system according to the sixth embodiment of the present invention from left to right in sequence;
fig. 6C is a diagram showing a visible spectrum modulation conversion characteristic of an optical imaging system according to a sixth embodiment of the present invention.
Description of reference numerals: 10. 20, 30, 40, 50, 60-optical imaging system; 100. 200, 300, 400, 500, 600-aperture; 110. 210, 310, 410, 510, 610-first lens; 112. 212, 312, 412, 512, 612-object side; 114. 214, 314, 414, 514, 614-image side; 120. 220, 320, 420, 520, 620 — second lens; 122. 222, 322, 422, 522, 622-object side; 124. 224, 324, 424, 524, 624-image side; 130. 230, 330, 430, 530, 630-third lens; 132. 232, 332, 432, 532, 632-item side; 134. 234, 334, 434, 534, 634-image side; 140. 240, 340, 440, 540, 640-fourth lens; 142. 242, 342, 442, 542, 642-object side; 144. 244, 344, 444, 544, 644-image side; 150. 250, 350, 450, 550, 650-fifth lens; 152. 252, 352, 452, 552, 652-object side; 154. 254, 354, 454, 554, 654-image side; 180. 280, 380, 480, 580, 680 infrared filters; 190. 290, 390, 490, 590, 690-imaging plane; 192. 292, 392, 492, 592, 692-image sensing elements; f-the focal length of the optical imaging system; f 1-focal length of the first lens; f 2-focal length of the second lens; f 3-focal length of the third lens; f 4-focal length of the fourth lens; f 5-focal length of fifth lens; F/HEP, Fno, F # -aperture value of the optical imaging system; half of the maximum viewing angle of the HAF-optical imaging system; NA1 — abbe number of the first lens; NA2, NA3, NA4, NA5 — the abbe numbers of the second to fifth lenses; r1, R2-radius of curvature of the object-side and image-side surfaces of the first lens; r3, R4-radius of curvature of the object-side and image-side surfaces of the second lens; r5, R6-radius of curvature of the object-side and image-side surfaces of the third lens; r7, R8-radius of curvature of the object and image sides of the fourth lens; r9, R10-radius of curvature of the object and image sides of the fifth lens; TP1 — thickness of first lens on optical axis; TP2, TP3, TP4, TP 5-thicknesses of the second to fifth lenses on the optical axis; Σ TP-the sum of the thicknesses of all the lenses with refractive power; IN 12-the distance between the first lens and the second lens on the optical axis; IN 23-the distance separating the second lens and the third lens on the optical axis; IN 34-the distance separating the third lens and the fourth lens on the optical axis; IN 45-the distance between the fourth lens and the fifth lens on the optical axis; InRS 51-horizontal displacement distance of the maximum effective radius position of the fifth lens object side surface from the intersection point of the fifth lens object side surface on the optical axis to the optical axis; IF 511-the point of inflection on the object-side of the fifth lens closest to the optical axis; SGI511 — the amount of subsidence at this point; HIF 511-vertical distance between the inflection point on the object-side of the fifth lens closest to the optical axis and the optical axis; IF 521-an inflection point on the image-side surface of the fifth lens closest to the optical axis; SGI521 — the amount of subsidence at this point; vertical distance between inflection point closest to optical axis on image side surface of HIF 521-fifth lens and optical axis; IF 512-a second inflection point on the object-side of the fifth lens near the optical axis; SGI512 — amount of subsidence at this point; HIF 512-vertical distance between the optical axis and the inflection point of the second near optical axis of the object-side surface of the fifth lens; IF 522-a second inflection point on the image-side surface of the fifth lens near the optical axis; SGI522 — amount of subsidence at this point; HIF 522-vertical distance between the second inflection point near the optical axis on the image-side surface of the fifth lens and the optical axis; c51-critical point of the object-side surface of the fifth lens; c52-critical point of image side surface of fifth lens; SGC 51-horizontal displacement distance of critical point of the object-side surface of the fifth lens from the optical axis; SGC 52-horizontal displacement distance between critical point of image side surface of fifth lens and optical axis; HVT 51-perpendicular distance of critical point of object side of fifth lens from optical axis; HVT 52-perpendicular distance between critical point of image side surface of the fifth lens and optical axis; HOS-System Total height (distance on optical axis from first lens object side to imaging plane); dg-diagonal length of the image sensor device; (ii) InS-distance of the aperture to the imaging plane; the InTL is the distance from the object side surface of the first lens to the image side surface of the fifth lens; InB-the distance from the image side surface of the fifth lens to the imaging surface; HOI-half of the diagonal length of the effective sensing area of the image sensing device (maximum image height); TDT-TV distortion (TVDistoretion) of the optical imaging system at the time of imaging; optical distortion (optical distortion) of the ODT-optical imaging system at the time of image formation; 201. 301, 401, 501, 601-mechanism light feed hole diameter (DDH).
Detailed Description
The utility model provides an optical imaging system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and an image plane with refractive power from an object side to an image side according to a certain order. The optical imaging system may further include an image sensor disposed on the imaging surface.
The optical imaging system can be designed using three operating wavelengths, 486.1nm, 587.5nm, 656.2nm, wherein 587.5nm is the primary reference wavelength for extracting the technical features. The optical imaging system can also be designed using five operating wavelengths, 470nm, 510nm, 555nm, 610nm, 650nm, respectively, where 555nm is the primary reference wavelength for the primary extraction features.
The ratio of the focal length f of the optical imaging system to the focal length fp of each lens with positive refractive power is PPR, the ratio of the focal length f of the optical imaging system to the focal length fn of each lens with negative refractive power is NPR, the sum of the PPR of all the lenses with positive refractive power is Σ PPR, and the sum of the NPR of all the lenses with negative refractive power is Σ NPR, which helps to control the total refractive power and the total length of the optical imaging system when the following conditions are satisfied: 0.5 ≦ Σ PPR/| Σ NPR ≦ 3.0, preferably, the following condition may be satisfied: 1 ≦ Σ PPR/| Σ NPR | < 2.5.
The optical imaging system may further include an image sensor disposed on the imaging surface. Half of the diagonal length of the effective sensing area of the image sensor (i.e. the imaging height of the optical imaging system or the maximum image height) is HOI, and the distance from the object-side surface of the first lens to the imaging surface on the optical axis is HOS, which satisfies the following conditions: HOS/HOI is less than or equal to 25; and HOS/f is more than or equal to 0.5 and less than or equal to 25. Preferably, the following conditions are satisfied: HOS/HOI is more than or equal to 1 and less than or equal to 20; and HOS/f is more than or equal to 1 and less than or equal to 20. Therefore, the optical imaging system can be kept miniaturized and can be carried on light and thin portable electronic products.
Additionally, the utility model discloses an among the optical imaging system, can set up an at least light ring according to the demand to reduce stray light, help promoting image quality.
The utility model discloses an among the optical imaging system, the diaphragm configuration can be leading light ring or put the light ring, and wherein leading light ring meaning light ring sets up between shot object and first lens promptly, and the middle-placed light ring then shows that the light ring sets up between first lens and imaging surface. If the diaphragm is a front diaphragm, the exit pupil of the optical imaging system can generate a longer distance with the imaging surface to accommodate more optical elements, and the image receiving efficiency of the image sensing element can be increased; if the diaphragm is arranged in the middle, the wide-angle lens is beneficial to expanding the field angle of the system, so that the optical imaging system has the advantage of a wide-angle lens. The distance between the diaphragm and the imaging surface is InS, which satisfies the following condition: 0.2-1.1 of InS/HOS. Thus, the optical imaging system can be kept compact and has wide-angle characteristics.
The utility model discloses an among the optical imaging system, the distance between first lens element object side to fifth lens element image side is InTL, and the thickness sum of all lens elements that have refractive power on the optical axis is sigma TP, and it satisfies the following condition: 0.1-0.9 of sigma TP/InTL. Therefore, the contrast of system imaging and the qualified rate of lens manufacturing can be considered simultaneously, and a proper back focal length is provided for accommodating other elements.
The radius of curvature of the object-side surface of the first lens is R1, and the radius of curvature of the image-side surface of the first lens is R2, which satisfies the following conditions: 0.01< "R1/R2 | 100. Therefore, the first lens element has proper positive refractive power strength, and the spherical aberration is prevented from increasing and speeding up. Preferably, the following conditions are satisfied: 0.05< "R1/R2 | < 80.
The radius of curvature of the object-side surface of the fifth lens is R9, and the radius of curvature of the image-side surface of the fifth lens is R10, which satisfies the following conditions: -50< (R9-R10)/(R9+ R10) < 50. Therefore, astigmatism generated by the optical imaging system is favorably corrected.
The first lens and the second lens are separated by a distance IN12 on the optical axis, which satisfies the following condition: IN12/f is less than or equal to 5.0. Therefore, the chromatic aberration of the lens is improved to improve the performance of the lens.
The fourth lens element is spaced apart from the fifth lens element by an optical axis distance IN45, which satisfies the following condition: IN45/f is less than or equal to 5.0. Therefore, the chromatic aberration of the lens is improved to improve the performance of the lens.
The thicknesses of the first lens element and the second lens element on the optical axis are TP1 and TP2, respectively, which satisfy the following conditions: (TP1+ IN12)/TP2 is more than or equal to 0.1 and less than or equal to 50.0. Therefore, the method is beneficial to controlling the manufacturing sensitivity of the optical imaging system and improving the performance of the optical imaging system.
The thicknesses of the fourth lens element and the fifth lens element on the optical axis are TP4 and TP5, respectively, and the distance between the two lens elements on the optical axis is IN45, which satisfies the following conditions: (TP5+ IN45)/TP4 is more than or equal to 0.1 and less than or equal to 50.0. Thereby, it is helpful to control the sensitivity of the optical imaging system and reduce the total height of the system.
The optical axis thicknesses of the second lens element, the third lens element and the fourth lens element are TP2, TP3 and TP4, respectively, the distance between the second lens element and the third lens element on the optical axis is IN23, the distance between the third lens element and the fourth lens element on the optical axis is IN34, and the distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is intil, which satisfies the following conditions: 0.1 is not less than TP3/(IN23+ TP3+ IN34) <1. Therefore, the optical fiber is helpful for slightly correcting aberration generated in the process of incident light advancing layer by layer and reducing the total height of the system.
The utility model discloses an among the optical imaging system, the critical point C51 of fifth lens object side is HVT51 with the vertical distance of optical axis, the critical point C52 of fifth lens image side is HVT52 with the vertical distance of optical axis, fifth lens object side is the horizontal displacement distance of the nodical to critical point C51 position on the optical axis for SGC51, the nodical to critical point C52 position on the optical axis of fifth lens image side is SGC52 in the horizontal displacement distance of optical axis, it satisfies the following condition: HVT51 is more than or equal to 0mm and less than or equal to 3 mm; 0mm < HVT52 is less than or equal to 6 mm; 0 is less than or equal to HVT51/HVT 52; 0mm | -SGC 51 | -is not less than 0.5 mm; 0mm < | SGC52 | is less than or equal to 2 mm; and 0 | SGC52 | l/(| SGC52 | TP5) is less than or equal to 0.9. Therefore, the aberration of the off-axis field can be effectively corrected.
The utility model discloses an optical imaging system its satisfies following condition: HVT52/HOI is more than or equal to 0.2 and less than or equal to 0.9. Preferably, the following conditions are satisfied: HVT52/HOI is more than or equal to 0.3 and less than or equal to 0.8. Thereby, aberration correction of the peripheral field of view of the optical imaging system is facilitated.
The utility model discloses an optical imaging system its satisfies following condition: HVT52/HOS is more than or equal to 0 and less than or equal to 0.5. Preferably, the following conditions are satisfied: HVT52/HOS is more than or equal to 0.2 and less than or equal to 0.45. Thereby, aberration correction of the peripheral field of view of the optical imaging system is facilitated.
The utility model discloses an among the optical imaging system, fifth lens object side represents with SGI511 with the parallel horizontal displacement distance of optical axis between the point of inflection of the most recent optical axis of the nodical to fifth lens object side of optical axis, fifth lens image side represents with SGI521 with the parallel horizontal displacement distance of optical axis between the point of inflection of the most recent optical axis of the nodical to fifth lens image side of optical axis, its following condition of satisfying: 0< SGI511/(SGI511+ TP5) ≦ 0.9; 0< SGI521/(SGI521+ TP5) ≦ 0.9. Preferably, the following conditions are satisfied: SGI511/(SGI511+ TP5) is more than or equal to 0.1 and less than or equal to 0.6; SGI521/(SGI521+ TP5) is more than or equal to 0.1 and less than or equal to 0.6.
A horizontal displacement distance parallel to the optical axis between an intersection point of the object-side surface of the fifth lens element on the optical axis and an inflection point of the object-side surface of the fifth lens element second near the optical axis is represented by SGI512, and a horizontal displacement distance parallel to the optical axis between an intersection point of the image-side surface of the fifth lens element on the optical axis and an inflection point of the image-side surface of the fifth lens element second near the optical axis is represented by SGI522, which satisfies the following conditions: 0< SGI512/(SGI512+ TP5) ≦ 0.9; 0< SGI522/(SGI522+ TP5) ≦ 0.9. Preferably, the following conditions are satisfied: SGI512/(SGI512+ TP5) is more than or equal to 0.1 and less than or equal to 0.6; SGI522/(SGI522+ TP5) is more than or equal to 0.1 and less than or equal to 0.6.
The vertical distance between the inflection point of the nearest optical axis of the object side surface of the fifth lens and the optical axis is represented by HIF511, and the vertical distance between the inflection point of the nearest optical axis of the image side surface of the fifth lens and the optical axis is represented by HIF521, which satisfies the following conditions: HIF 511-is less than or equal to 0.001mm and less than or equal to 5 mm; 0.001mm < l > HIF521 l < l > 5 mm. Preferably, the following conditions are satisfied: 0.1mm < l-HIF 511- < 3.5 mm; 1.5mm < l > HIF521 l < l > 3.5 mm.
The vertical distance between the second near-optical-axis inflection point of the object-side surface of the fifth lens element and the optical axis is HIF512, and the vertical distance between the second near-optical-axis inflection point of the image-side surface of the fifth lens element and the optical axis from the intersection point of the image-side surface of the fifth lens element and the optical axis is HIF522, wherein the following conditions are satisfied: HIF512 | is less than or equal to 5mm and is more than or equal to 0.001 mm; HIF522 | of 0.001 mm. ltoreq.5 mm. Preferably, the following conditions are satisfied: 0.1mm < l HIF522 l < 3.5 mm; 0.1mm ≦ HIF512 ≦ 3.5 mm.
The vertical distance between the third inflection point near the optical axis of the object-side surface of the fifth lens and the optical axis is represented by HIF513, and the vertical distance between the intersection point on the optical axis of the image-side surface of the fifth lens and the third inflection point near the optical axis and the optical axis is represented by HIF523, which satisfies the following conditions: 0.001mm < l-HIF 513 l < l > 5 mm; 0.001 mm. ltoreq. HIF523 | 5 mm. Preferably, the following conditions are satisfied: 0.1mm < l-HIF 523 l < l > 3.5 mm; 0.1mm ≦ HIF513 ≦ 3.5 mm.
The vertical distance between the fourth inflection point near the optical axis on the object-side surface of the fifth lens element and the optical axis is denoted by HIF514, and the vertical distance between the fourth inflection point near the optical axis on the image-side surface of the fifth lens element and the optical axis is denoted by HIF524, wherein the following conditions are satisfied: 0.001mm < l > HIF514 | < l > 5 mm; 0.001mm ≦ HIF524 ≦ 5 mm. Preferably, the following conditions are satisfied: 0.1mm < l HIF524 | < 3.5 mm; 0.1mm ≦ HIF514 ≦ 3.5 mm.
The utility model discloses an optical imaging system's an embodiment, the accessible has the lens staggered arrangement of high dispersion coefficient and low dispersion coefficient to help optical imaging system chromatic aberration's correction.
The equation for the above aspheric surface is:
z＝ch2/[1+[1(k+1)c2h2]0.5]+A4h4+A6h6+A8h8+A10h10+A12h12+A14h14+A16h16+A18h18+A20h20+… (1)
where z is a position value referenced to a surface vertex at a position of height h in the optical axis direction, k is a cone coefficient, c is a reciprocal of a radius of curvature, and a4, A6, A8, a10, a12, a14, a16, a18, and a20 are high-order aspheric coefficients.
The utility model provides an among the optical imaging system, the material of lens can be plastics or glass. When the lens material is plastic, the production cost and the weight can be effectively reduced. In addition, when the lens is made of glass, the thermal effect can be controlled and the design space of the refractive power configuration of the optical imaging system can be increased. In addition, the object side and the image side of first lens to fifth lens among the optical imaging system can be the aspheric surface, and it can obtain more control variable, except that being used for subducing the aberration, compare in the use of traditional glass lens the number that reducible lens used even, consequently can effectively reduce the utility model discloses optical imaging system's overall height.
Furthermore, in the optical imaging system provided by the present invention, if the lens surface is a convex surface, the lens surface is a convex surface at the paraxial region in principle; if the lens surface is concave, it means in principle that the lens surface is concave at the paraxial region.
The utility model discloses an optical imaging system more visual demand is applied to in the optical system that removes and focus to have good aberration concurrently and revise and good imaging quality's characteristic, thereby enlarge the application aspect.
The utility model discloses a more visual demand of optical imaging system includes a drive module, and this drive module can be coupled with these a plurality of lenses and make these a plurality of lenses produce the displacement. The driving module may be a Voice Coil Motor (VCM) for driving the lens to focus, or an optical hand vibration prevention element (OIS) for reducing the frequency of out-of-focus caused by lens vibration during the shooting process.
The utility model discloses an optical imaging system more visual demand makes at least one lens be the light filtering component that the wavelength is less than 500nm in first lens, second lens, third lens, fourth lens and the fifth lens, and coating film on at least one surface of the lens of its accessible this special utensil filtering function or this lens itself are made by the material that has the filterable short wavelength and reach.
The utility model discloses a more visual demand of imaging surface of optical imaging system selects to a plane or a curved surface. When the imaging plane is a curved surface (e.g., a spherical surface with a radius of curvature), it is helpful to reduce the incident angle required for focusing light on the imaging plane, which is helpful to improve the relative illumination in addition to achieving the length (TTL) of the miniature optical imaging system.
Use the utility model discloses an on the electron device that optical imaging system loaded, an mechanism light inlet can be located to have in the thing side, and aforementioned mechanism light inlet can be electron device's leading camera lens trompil, and it can restrict the route that the thing side light penetrated, and this mechanism light inlet diameter shows with DDH. The optical imaging system of the present invention can further include at least one reflection element, such as a prism or a reflection mirror, etc., to enhance the space of the imaging system disposed on the terminal device for distribution and application, and to allow the imaging system to increase the total number of lenses in the limited mechanism space. The reflecting element can be arranged between the lenses in the optical imaging system, and is favorable for reducing the mechanism caliber before the light enters the first lens. In addition, the reflective element can also be disposed at the object-side end of the first lens element, which is favorable for shortening the total system length of the optical imaging system. The number of the reflecting elements can be more than two according to requirements, and the arrangement mode of the reflecting surface can be adjusted according to requirements such as space configuration and the like. The prism may be made of a material with a suitable refractive index or dispersion coefficient, such as glass or plastic, as required. The thickness of the prism (i.e., the total length of the internal optical path of the prism) is denoted by PT, and is mainly composed of an incident section ray path PT1 (i.e., the central field ray or optical axis) and an emergent section ray path PT2 (i.e., the central field ray or optical axis), i.e., PT1+ PT 2. The thickness of the prism is mainly affected by the refractive index of the material, the angle of view of the optical imaging system and the size of the aperture.
In the following, specific embodiments are provided and will be described in detail with reference to the drawings.
First embodiment
Referring to fig. 1A and fig. 1B, wherein fig. 1A is a schematic diagram illustrating an optical imaging system according to a first embodiment of the present invention, and fig. 1B is a graph illustrating spherical aberration, astigmatism and optical distortion of the optical imaging system according to the first embodiment in order from left to right. Fig. 1C is a diagram illustrating the visible light spectrum modulation conversion characteristics of the present embodiment. In fig. 1A, the optical imaging system includes, in order from an object side to an image side, a first lens element 110, an aperture stop 100, a second lens element 120, a third lens element 130, a fourth lens element 140, a fifth lens element 150, an ir-filter 180, an image plane 190 and an image sensor 192.
The first lens element 110 with negative refractive power has a convex object-side surface 112 and a concave image-side surface 114, and is aspheric, and the object-side surface 112 has an inflection point. The thickness of the first lens on the optical axis is TP1, and the thickness of the first lens at 1/2 of the entrance pupil diameter (HEP) height is represented by ETP 1.
The horizontal displacement distance parallel to the optical axis between the intersection point of the object-side surface of the first lens on the optical axis and the inflection point of the nearest optical axis of the object-side surface of the first lens is represented by SGI111, and the horizontal displacement distance parallel to the optical axis between the inflection points of the nearest optical axis of the image-side surface of the first lens is represented by SGI121, which satisfy the following conditions: SGI 111-1.96546 mm; | SGI111 |/(| SGI111 | + TP1) | -0.72369.
The vertical distance between the inflection point of the nearest optical axis of the object-side surface of the first lens and the optical axis is represented by HIF111, and the vertical distance between the inflection point of the nearest optical axis of the image-side surface of the first lens and the optical axis is represented by HIF121, which satisfies the following conditions: HIF 111-3.38542 mm; HIF111/HOI 0.90519.
The second lens element 120 with positive refractive power has a convex object-side surface 122 and a concave image-side surface 124. The thickness of the second lens on the optical axis is TP2, and the thickness of the second lens at 1/2 of the entrance pupil diameter (HEP) height is represented by ETP 2.
The horizontal displacement distance parallel to the optical axis between the intersection point of the object-side surface of the second lens on the optical axis and the inflection point of the nearest optical axis of the object-side surface of the second lens is represented by SGI211, and the horizontal displacement distance parallel to the optical axis between the inflection points of the nearest optical axis of the image-side surface of the second lens is represented by SGI 221.
The vertical distance between the inflection point of the nearest optical axis of the object-side surface of the second lens and the optical axis is represented by HIF211, and the vertical distance between the inflection point of the nearest optical axis of the image-side surface of the second lens and the optical axis is represented by HIF 221.
The third lens element 130 with positive refractive power has a convex object-side surface 132 and a convex image-side surface 134, and is aspheric, and the object-side surface 132 has an inflection point. The thickness of the third lens on the optical axis is TP3, and the thickness of the third lens at 1/2 of the entrance pupil diameter (HEP) height is represented by ETP 3.
The horizontal displacement distance parallel to the optical axis between the intersection point of the object-side surface of the third lens on the optical axis and the inflection point of the nearest optical axis of the object-side surface of the third lens is represented by SGI311, and the horizontal displacement distance parallel to the optical axis between the intersection point of the image-side surface of the third lens on the optical axis and the inflection point of the nearest optical axis of the image-side surface of the third lens is represented by SGI321, which satisfies the following conditions: SGI311 0.00388 mm; | SGI311 |/(| SGI311 | + TP3) | 0.00414.
The horizontal displacement distance parallel to the optical axis between the intersection point of the object-side surface of the third lens element on the optical axis and the second inflection point near the optical axis of the object-side surface of the third lens element is shown as SGI312, and the horizontal displacement distance parallel to the optical axis between the intersection point of the image-side surface of the third lens element on the optical axis and the second inflection point near the optical axis of the image-side surface of the third lens element is shown as SGI 322.
The vertical distance between the inflection point of the nearest optical axis of the object-side surface of the third lens and the optical axis is represented by HIF311, and the vertical distance between the inflection point of the nearest optical axis of the image-side surface of the third lens and the optical axis is represented by HIF321, which satisfies the following conditions: HIF311 0.38898 mm; HIF311/HOI 0.10400.
The vertical distance between the second near-optic axis inflection point of the object-side surface of the third lens and the optic axis is denoted by HIF412, and the vertical distance between the second near-optic axis inflection point of the image-side surface of the fourth lens and the optic axis is denoted by HIF 422.
The fourth lens element 140 with positive refractive power has a convex object-side surface 142 and a convex image-side surface 144, and is aspheric, and the object-side surface 142 has a inflection point. The thickness of the fourth lens on the optical axis is TP4, and the thickness of the fourth lens at 1/2 of the entrance pupil diameter (HEP) height is shown as ETP 4.
The horizontal displacement distance parallel to the optical axis between the intersection point of the object-side surface of the fourth lens on the optical axis and the inflection point of the nearest optical axis of the object-side surface of the fourth lens is represented by SGI411, and the horizontal displacement distance parallel to the optical axis between the intersection point of the image-side surface of the fourth lens on the optical axis and the inflection point of the nearest optical axis of the image-side surface of the fourth lens is represented by SGI421, which satisfies the following conditions: SGI421 ═ 0.06508 mm; | SGI421 |/(| SGI421 | + TP4) | -0.03459.
The horizontal displacement distance parallel to the optical axis between the intersection point of the object-side surface of the fourth lens element on the optical axis and the second inflection point near the optical axis of the object-side surface of the fourth lens element is shown as SGI412, and the horizontal displacement distance parallel to the optical axis between the intersection point of the image-side surface of the fourth lens element on the optical axis and the second inflection point near the optical axis of the image-side surface of the fourth lens element is shown as SGI 422.
The vertical distance between the inflection point of the nearest optical axis of the object-side surface of the fourth lens and the optical axis is represented by HIF411, and the vertical distance between the inflection point of the nearest optical axis of the image-side surface of the fourth lens and the optical axis is represented by HIF421, which satisfies the following conditions: HIF421 of 0.85606 mm; HIF421/HOI 0.22889.
The vertical distance between the second inflection point near the optical axis on the object-side surface of the fourth lens and the optical axis is denoted by HIF412, and the vertical distance between the second inflection point near the optical axis and the optical axis on the image-side surface of the fourth lens is denoted by HIF 422.
The fifth lens element 150 with negative refractive power has a concave object-side surface 152 and a concave image-side surface 154, and is aspheric, and the object-side surface 152 and the image-side surface 154 have inflection points. The thickness of the fifth lens on the optical axis is TP5, and the thickness of the fifth lens at 1/2 of the entrance pupil diameter (HEP) height is represented by ETP 5.
The horizontal displacement distance parallel to the optical axis between the intersection point of the object-side surface of the fifth lens on the optical axis and the inflection point of the nearest optical axis of the object-side surface of the fifth lens is represented by SGI511, and the horizontal displacement distance parallel to the optical axis between the intersection point of the image-side surface of the fifth lens on the optical axis and the inflection point of the nearest optical axis of the image-side surface of the fifth lens is represented by SGI521, which satisfies the following conditions: SGI 511-1.51505 mm; | SGI511 |/(| SGI511 | TP5) | 0.70144; SGI521 ═ 0.01229 mm; | SGI521 |/(| SGI521 | + TP5) | -0.01870.
A horizontal displacement distance parallel to the optical axis between an intersection point of the object-side surface of the fifth lens element on the optical axis and an inflection point of the object-side surface of the fifth lens element second close to the optical axis is represented by SGI512, and a horizontal displacement distance parallel to the optical axis between an intersection point of the image-side surface of the fifth lens element on the optical axis and an inflection point of the image-side surface of the fifth lens element second close to the optical axis is represented by SGI 522.
The vertical distance between the inflection point of the nearest optical axis of the object side surface of the fifth lens and the optical axis is represented by HIF511, and the vertical distance between the inflection point of the nearest optical axis of the image side surface of the fifth lens and the optical axis is represented by HIF521, which satisfies the following conditions: HIF 511-2.25435 mm; HIF511/HOI 0.60277; HIF521 ═ 0.82313 mm; HIF521/HOI 0.22009.
The vertical distance between the second inflection point near the optical axis on the object-side surface of the fifth lens element and the optical axis is HIF512, and the vertical distance between the second inflection point near the optical axis and the optical axis on the image-side surface of the fifth lens element is HIF 522.
In this embodiment, the distance between the coordinate point of the first lens element at the 1/2HEP height on the object-side surface and the image plane parallel to the optical axis is ETL, and the horizontal distance between the coordinate point of the first lens element at the 1/2HEP height on the object-side surface and the coordinate point of the fourth lens element at the 1/2HEP height on the image-side surface is EIN, which satisfies the following conditions: ETL 10.449 mm; EIN 9.752 mm; EIN/ETL is 0.933.
This example satisfies the following conditions, ETP1 ═ 0.870 mm; ETP2 ═ 0.780 mm; ETP3 ═ 0.825 mm; ETP4 ═ 1.562 mm; ETP5 ═ 0.923 mm. The sum SETP of the ETP1 to ETP5 is 4.960 mm. TP1 ═ 0.750 mm; TP2 ═ 0.895 mm; TP3 ═ 0.932 mm; TP 4-1.816 mm; TP5 ═ 0.645 mm; the sum STP of the aforementioned TP1 to TP5 was 5.039 mm. SETP/STP is 0.984.
In the present embodiment, the proportional relationship (ETP/TP) between the thickness (ETP) of each lens at 1/2 of the entrance pupil diameter (HEP) height and the Thickness (TP) of the lens on the optical axis to which the surface belongs is controlled so as to balance the manufacturability and the aberration correction capability, and the ETP1/TP1 is 1.160; ETP2/TP2 ═ 0.871; ETP3/TP3 ═ 0.885; ETP4/TP4 is 0.860; ETP5/TP5 ═ 1.431.
IN the present embodiment, the horizontal distance between two adjacent lenses at the height of 1/2 of the entrance pupil diameter (HEP) is controlled to balance the degree of "shrinkage" of the length HOS of the optical imaging system, the manufacturability and the aberration correction capability, and particularly, the proportional relationship (ED/IN) between the horizontal distance (ED) between the height of 1/2 of the entrance pupil diameter (HEP) of the two adjacent lenses and the horizontal distance (IN) between the two adjacent lenses on the optical axis is controlled to satisfy the following condition that the horizontal distance parallel to the optical axis between the first lens and the second lens at the height of 1/2 of the entrance pupil diameter (HEP) is ED12 ═ 3.152 mm; the horizontal distance parallel to the optical axis between the second lens and the third lens at 1/2 of the height of the entrance pupil diameter (HEP) is ED 23-0.478 mm; the horizontal distance between the third lens and the fourth lens at the height of 1/2 of the entrance pupil diameter (HEP) and parallel to the optical axis is ED 34-0.843 mm; the horizontal distance parallel to the optical axis between the fourth lens and the fifth lens at 1/2 of the height of the entrance pupil diameter (HEP) is ED 45-0.320 mm. The sum of the aforementioned ED12 to ED45 is denoted SED and SED 4.792 mm.
The horizontal distance between the first lens and the second lens on the optical axis is IN 12-3.190 mm, and ED12/IN 12-0.988. The horizontal distance between the second lens and the third lens on the optical axis is IN 23-0.561 mm, and ED23/IN 23-0.851. The horizontal distance between the third lens and the fourth lens on the optical axis is 0.656mm IN34, and 1.284 IN ED34/IN 34. The horizontal distance between the fourth lens and the fifth lens on the optical axis is IN 45-0.405 mm, and ED45/IN 45-0.792. The sum of the aforementioned IN12 to IN45 is denoted by SIN and SIN is 0.999 mm. SED/SIN is 1.083.
The implementation also satisfies the following conditions ED12/ED23 ═ 6.599; ED23/ED34 is 0.567; ED34/ED45 is 2.630; IN12/IN23 ═ 5.687; IN23/IN34 is 0.855; IN34/IN45 equals 1.622.
The horizontal distance that is on a parallel with the optical axis between the coordinate point of 1/2HEP height on the image side of the fifth lens to this imaging plane is EBL 0.697mm, and the horizontal distance that is on a parallel with the optical axis between the nodical to this imaging plane of the fifth lens image side of the fifth lens is BL 0.71184mm, the embodiment of the utility model can satisfy the following formula: and EBL/BL is 0.979152. In this embodiment, the distance between the coordinate point of the image-side surface of the fifth lens element at 1/2HEP height and the infrared filter, which is parallel to the optical axis, is EIR 0.085mm, and the distance between the intersection point of the image-side surface of the fifth lens element and the optical axis and the infrared filter, which is parallel to the optical axis, is PIR 0.100mm, and the following formula is satisfied: EIR/PIR is 0.847.
The infrared filter 180 is made of glass, and is disposed between the fifth lens element 150 and the image plane 190 without affecting the focal length of the optical imaging system.
In the optical imaging system of this embodiment, the focal length of the optical imaging system is f, the diameter of the entrance pupil of the optical imaging system is HEP, and half of the maximum viewing angle in the optical imaging system is HAF, and the numerical values thereof are as follows: 3.03968 mm; f/HEP is 1.6; and HAF 50.001 degrees and tan (HAF) 1.1918.
In the optical imaging system of the present embodiment, the focal length of the first lens 110 is f1, and the focal length of the fifth lens 150 is f5, which satisfies the following conditions: f 1-9.24529 mm; | f/f1 | -0.32878; f5 ═ 2.32439; and | f1 | f 5.
In the optical imaging system of the present embodiment, the focal lengths of the second lens 120 to the fifth lens 150 are f2, f3, f4, and f5, respectively, which satisfy the following conditions: f2 | + -f 3 | + f4 | -17.3009 mm; | f1 | + -f 5 | -11.5697 mm and | -f 2 | + f3 | -f 4 | -f 1 | + f5 |.
In the optical imaging system of this embodiment, the sum of the PPRs of all the lenses with positive refractive power is Σ PPR ═ f/f2+ f/f3+ f/f4 ═ 1.86768, the sum of the NPRs of all the lenses with negative refractive power is Σ NPR ═ f/f1+ f/f5 ═ 1.63651, and Σ PPR/| NPR | _ 1.14125. The following conditions are also satisfied: | f/f2 | -0.47958; | f/f3 | -0.38289; | f/f4 | -1.00521; | f/f5 | -1.30773.
In the optical imaging system of this embodiment, the distance between the object-side surface 112 of the first lens element and the image-side surface 154 of the fifth lens element is InTL, the distance between the object-side surface 112 of the first lens element and the image plane 190 is HOS, the distance between the aperture stop 100 and the image plane 180 is InS, half of the diagonal length of the effective sensing area of the image sensor 192 is HOI, and the distance between the image-side surface 154 of the fifth lens element and the image plane 190 is BFL, which satisfy the following conditions: instl + BFL ═ HOS; HOS 10.56320 mm; HOI 3.7400 mm; HOS/HOI 2.8244; HOS/f 3.4751; 6.21073mm for InS; and InS/HOS 0.5880.
In the optical imaging system of the present embodiment, the sum of the thicknesses of all the lenses with refractive power on the optical axis is Σ TP, which satisfies the following condition: Σ TP is 5.0393 mm; 9.8514mm for InTL and 0.5115 for Σ TP/InTL. Therefore, the contrast of system imaging and the qualified rate of lens manufacturing can be considered simultaneously, and a proper back focal length is provided for accommodating other elements.
In the optical imaging system of the present embodiment, the radius of curvature of the object-side surface 112 of the first lens is R1, and the radius of curvature of the image-side surface 114 of the first lens is R2, which satisfy the following conditions: R1/R2 | -1.9672. Therefore, the first lens element has proper positive refractive power strength, and the spherical aberration is prevented from increasing and speeding up.
In the optical imaging system of the present embodiment, the radius of curvature of the object-side surface 152 of the fifth lens is R9, and the radius of curvature of the image-side surface 154 of the fifth lens is R10, which satisfy the following conditions: (R9-R10)/(R9+ R10) — 1.1505. Therefore, astigmatism generated by the optical imaging system is favorably corrected.
In the optical imaging system of this embodiment, the sum of the focal lengths of all the lenses with positive refractive power is Σ PP, which satisfies the following condition: f2+ f3+ f4 is 17.30090 mm; and f2/(f2+ f3+ f4) ═ 0.36635. Therefore, it is helpful to properly distribute the positive refractive power of the second lens element 120 to the other positive lens elements to suppress the occurrence of significant aberration during the incident light traveling process.
In the optical imaging system of this embodiment, the sum of the focal lengths of all the lenses with negative refractive power is Σ NP, which satisfies the following condition: Σ NP ═ f1+ f5 ═ -11.56968 mm; and f5/(f1+ f5) ═ 0.20090. Therefore, the negative refractive power of the fifth lens element can be properly distributed to the other negative lens elements, so as to suppress the occurrence of significant aberration during the incident light beam traveling process.
IN the optical imaging system of the present embodiment, the distance between the first lens element 110 and the second lens element 120 on the optical axis is IN12, which satisfies the following condition: IN 12-3.19016 mm; IN12/f 1.04951. Therefore, the chromatic aberration of the lens is improved to improve the performance of the lens.
IN the optical imaging system of the present embodiment, the distance between the fourth lens element 140 and the fifth lens element 150 on the optical axis is IN45, which satisfies the following condition: IN 45-0.40470 mm; IN45/f 0.13314. Therefore, the chromatic aberration of the lens is improved to improve the performance of the lens.
In the optical imaging system of the present embodiment, the thicknesses of the first lens element 110, the second lens element 120, and the third lens element 130 on the optical axis are TP1, TP2, and TP3, respectively, which satisfy the following conditions: TP 1-0.75043 mm; TP 2-0.89543 mm; TP 3-0.93225 mm; and (TP1+ IN12)/TP2 ═ 4.40078. Therefore, the method is beneficial to controlling the manufacturing sensitivity of the optical imaging system and improving the performance of the optical imaging system.
IN the optical imaging system of the present embodiment, the thicknesses of the fourth lens element 140 and the fifth lens element 150 on the optical axis are TP4 and TP5, respectively, and the distance between the two lens elements on the optical axis is IN45, which satisfies the following conditions: TP 4-1.81634 mm; TP 5-0.64488 mm; and (TP5+ IN45)/TP4 ═ 0.57785. Thereby, it is helpful to control the sensitivity of the optical imaging system and reduce the total height of the system.
IN the optical imaging system of the present embodiment, the distance between the third lens element 130 and the fourth lens element 140 on the optical axis is IN34, and the distance between the object-side surface 112 of the first lens element and the image-side surface 164 of the fifth lens element is invl, which satisfies the following conditions: TP2/TP3 ═ 0.96051; TP3/TP4 ═ 0.51325; TP4/TP5 ═ 2.81657; and TP3/(IN23+ TP3+ IN34) ═ 0.43372. Thereby being helpful to slightly correcting aberration generated in the process of incident light advancing layer by layer and reducing the total height of the system.
In the optical imaging system of the present embodiment, a horizontal displacement distance between an intersection point of the fourth lens object-side surface 142 on the optical axis and a maximum effective radius position of the fourth lens object-side surface 142 on the optical axis is InRS41, a horizontal displacement distance between an intersection point of the fourth lens image-side surface 144 on the optical axis and a maximum effective radius position of the fifth lens image-side surface 144 on the optical axis is InRS42, and a thickness of the fourth lens element 140 on the optical axis is TP4, which satisfies the following conditions: InRS 41-0.09737 mm; InRS 42-1.31040 mm; | InRS41 |/TP 4 ═ 0.05361 and | InRS42 |/TP 4 ═ 0.72145. Therefore, the manufacturing and molding of the lens are facilitated, and the miniaturization of the lens is effectively maintained.
In the optical imaging system of the present embodiment, a vertical distance between a critical point of the object-side surface 142 of the fourth lens element and the optical axis is HVT41, and a vertical distance between a critical point of the image-side surface 144 of the fourth lens element and the optical axis is HVT42, which satisfies the following conditions: HVT41 ═ 1.41740 mm; HVT42 ═ 0.
In the optical imaging system of this embodiment, a horizontal displacement distance between an intersection point of the fifth lens object-side surface 152 on the optical axis and a maximum effective radius position of the fifth lens object-side surface 152 on the optical axis is InRS51, a horizontal displacement distance between an intersection point of the fifth lens image-side surface 154 on the optical axis and a maximum effective radius position of the fifth lens image-side surface 154 on the optical axis is InRS52, and a thickness of the fifth lens 150 on the optical axis is TP5, which satisfies the following conditions: InRS 51-1.63543 mm; InRS 52-0.34495 mm; | InRS51 |/TP 5 ═ 2.53604 and | InRS52 |/TP 5 ═ 0.53491. Therefore, the manufacturing and molding of the lens are facilitated, and the miniaturization of the lens is effectively maintained.
In the optical imaging system of the present embodiment, a vertical distance between a critical point of the object-side surface 162 of the fifth lens element and the optical axis is HVT51, and a vertical distance between a critical point of the image-side surface 154 of the fifth lens element and the optical axis is HVT52, which satisfies the following conditions: HVT51 ═ 0; HVT52 ═ 1.35891 mm; and HVT51/HVT52 ═ 0.
In the optical imaging system of the present embodiment, it satisfies the following conditions: HVT52/HOI 0.36334. Thereby, aberration correction of the peripheral field of view of the optical imaging system is facilitated.
In the optical imaging system of the present embodiment, it satisfies the following conditions: HVT52/HOS 0.12865. Thereby, aberration correction of the peripheral field of view of the optical imaging system is facilitated.
In the optical imaging system of this embodiment, the third lens element and the fifth lens element have negative refractive power, the third lens element has an abbe number NA3, and the fifth lens element has an abbe number NA5, which satisfy the following conditions: NA5/NA3 0.368966. Therefore, the correction of the chromatic aberration of the optical imaging system is facilitated.
In the optical imaging system of this embodiment, the TV distortion of the optical imaging system at the time of image formation is TDT, and the optical distortion at the time of image formation is ODT, which satisfy the following conditions: | TDT | -0.63350%; and | ODT | -2.06135%.
In the optical imaging system of the present embodiment, the modulation conversion contrast transfer ratios (MTF values) at the spatial frequency of 55cycles/mm of the optical axis, 0.3HOI and 0.7HOI on the imaging plane are respectively expressed by MTFE0, MTFE3 and MTFE7, which satisfy the following conditions: MTFE0 was about 0.65; MTFE3 was about 0.47; and MTFE7 is about 0.39. Modulation conversion contrast transfer ratios (MTF values) of the optical axis, 0.3HOI, and 0.7HOI on the imaging plane at a spatial frequency of 110cycles/mm are respectively expressed by MTFQ0, MTFQ3, and MTFQ7, which satisfy the following conditions: MTFQ0 was about 0.38; MTFQ3 was about 0.14; and MTFQ7 is about 0.13. The modulation conversion contrast transfer ratios (MTF values) of the optical axis, 0.3HOI and 0.7HOI on the imaging plane at the spatial frequency of 220cycles/mm are respectively expressed by MTFH0, MTFH3 and MTFH7, which satisfy the following conditions: MTFH0 was about 0.17; MTFH3 was about 0.07; and MTFH7 was about 0.14.
In the optical imaging system of this embodiment, when the infrared operating wavelength is 850nm and is focused on the imaging plane, the optical axis, 0.3HOI and 0.7HOI of the image on the imaging plane are respectively expressed by MTFI0, MTFI3 and MTFI7, which satisfy the following conditions: MTFI0 was about 0.05; MTFI3 was about 0.12; and MTFI7 is about 0.11.
The following list I and list II are referred to cooperatively.
TABLE II aspherical coefficients of the first example
According to the first and second tables, the following values related to the length of the profile curve can be obtained:
in the first embodiment, detailed structural data are shown in fig. 1A-1C, wherein the units of the radius of curvature, the thickness, the distance, and the focal length are mm, and surfaces 0-16 sequentially represent surfaces from the object side to the image side. Table II shows aspheric data of the first embodiment, where k represents the cone coefficients in the aspheric curve equation, and A1-A20 represents the aspheric coefficients of order 1-20 of each surface. In addition, the following tables of the embodiments correspond to the schematic diagrams and aberration graphs of the embodiments, and the definitions of the data in the tables are the same as those of the first and second tables of the first embodiment, which is not repeated herein.
Second embodiment
Referring to fig. 2A and fig. 2B, fig. 2A is a schematic diagram of an optical imaging system according to a second embodiment of the present invention, and fig. 2B is a graph of spherical aberration, astigmatism and optical distortion of the optical imaging system of the second embodiment in order from left to right. Fig. 2C is a diagram illustrating the visible light spectrum modulation conversion characteristics of the embodiment. In fig. 2A, the optical imaging system includes, in order from an object side to an image side, a first lens element 210, an aperture stop 200, a second lens element 220, a third lens element 230, a fourth lens element 240, a fifth lens element 250, an ir-pass filter 280, an image plane 290 and an image sensor 292.
In the electronic device of the present embodiment, a mechanism light inlet 201 may be disposed at the object side to limit the path of the incident object-side light, and the diameter DDH of the mechanism light inlet 201 is 1.967 mm. The distance between the mechanism light inlet 201 and the object side lens center (where the optical axis passes) of the first lens 210 is 0.2 mm.
The first lens element 210 with positive refractive power is made of glass, has a planar object-side surface 212 and a planar image-side surface 214, and has an infinite focal length (INF).
The second lens element 220 with positive refractive power has a convex object-side surface 222 and a convex image-side surface 224, and is aspheric, wherein the object-side surface 222 has two inflection points and the image-side surface 224 has one inflection point.
The third lens element 230 with negative refractive power has a concave object-side surface 232 and a concave image-side surface 234, and is aspheric, wherein the object-side surface 232 has three inflection points and the image-side surface 234 has one inflection point.
The fourth lens element 240 with positive refractive power has a concave object-side surface 242 and a convex image-side surface 244, and is aspheric, wherein the object-side surface 242 has two inflection points and the image-side surface 244 has one inflection point.
The fifth lens element 250 with negative refractive power has a convex object-side surface 252 and a concave image-side surface 254, and is aspheric, and has two inflection points on the object-side surface 242 and an inflection point on the image-side surface 244. Therefore, the angle of incidence of the light rays in the off-axis field can be effectively suppressed, and the aberration of the off-axis field can be further corrected.
The infrared filter 280 is made of glass, and is disposed between the fifth lens element 250 and the image plane 290 without affecting the focal length of the optical imaging system.
Please refer to the following table three and table four.
TABLE IV aspheric coefficients of the second embodiment
In the second embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.
According to the third table and the fourth table, the following conditional expressions can be obtained:
the following values can be obtained according to table three and table four:
third embodiment
Referring to fig. 3A and 3B, fig. 3A is a schematic diagram illustrating an optical imaging system according to a third embodiment of the present invention, and fig. 3B is a graph illustrating spherical aberration, astigmatism and optical distortion of the optical imaging system according to the third embodiment in order from left to right. Fig. 3C is a diagram illustrating the visible light spectrum modulation conversion characteristics of the embodiment. In fig. 3A, the optical imaging system includes, in order from an object side to an image side, a first lens element 310, an aperture stop 300, a second lens element 320, a third lens element 330, a fourth lens element 340, a fifth lens element 350, an ir-pass filter 380, an image plane 390 and an image sensor 392.
In the electronic device equipped in this embodiment, a mechanism light inlet 301 may be disposed at the object side to limit the incident path of the object side light, and the diameter DDH of the mechanism light inlet 301 is 1.962 mm. The distance between the mechanism light inlet hole 301 and the object side lens center (where the optical axis passes) of the first lens 310 is 0.2 mm.
The first lens element 310 with positive refractive power is made of glass, has a planar object-side surface 312 and a planar image-side surface 314, and is a flat glass with an infinite focal length (INF).
The second lens element 320 with positive refractive power has a convex object-side surface 322 and a convex image-side surface 324, and is aspheric, and the object-side surface 322 has an inflection point.
The third lens element 330 with negative refractive power has a convex object-side surface 332 and a concave image-side surface 334, and is aspheric, wherein the object-side surface 332 has two inflection points and the image-side surface 334 has three inflection points.
The fourth lens element 340 with positive refractive power is made of plastic, has a concave object-side surface 342 and a convex image-side surface 344, and is aspheric, wherein the object-side surface 342 has two inflection points and the image-side surface 344 has one inflection point.
The fifth lens element 350 with negative refractive power is made of plastic, has a convex object-side surface 352 and a concave image-side surface 354, is aspheric, and has two inflection points on the object-side surface 352 and one inflection point on the image-side surface 354. Thus, it is advantageous to shorten the back focal length to maintain miniaturization.
The infrared filter 380 is made of glass, and is disposed between the fifth lens element 350 and the image plane 390 without affecting the focal length of the optical imaging system.
Please refer to table five and table six below.
TABLE sixth, aspherical coefficients of the third example
In the third embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.
According to table five and table six, the following conditional values can be obtained:
according to table five and table six, the following conditional values can be obtained:
fourth embodiment
Referring to fig. 4A and 4B, fig. 4A is a schematic diagram illustrating an optical imaging system according to a fourth embodiment of the present invention, and fig. 4B is a graph illustrating spherical aberration, astigmatism and optical distortion of the optical imaging system according to the fourth embodiment in order from left to right. Fig. 4C is a graph showing the visible light spectrum modulation conversion characteristics of the present embodiment. In fig. 4A, the optical imaging system includes, in order from an object side to an image side, a first lens element 410, an aperture stop 400, a second lens element 420, a third lens element 430, a fourth lens element 440, a fifth lens element 450, an ir-filter 480, an image plane 490 and an image sensor 492.
In the electronic device of the present embodiment, a mechanism aperture 401 may be disposed at the object side to limit the path of the incident light beam, and the diameter DDH of the mechanism aperture 401 is 1.950 mm. The distance between the mechanism light inlet 401 and the object side lens center (where the optical axis passes) of the first lens 410 is 0.2 mm.
The first lens element 410 with negative refractive power has a concave object-side surface 412 and a convex image-side surface 414, and is made of glass.
The second lens element 420 with positive refractive power has a convex object-side surface 422 and a convex image-side surface 424, and is aspheric, and the object-side surface 422 has a inflection point.
The third lens element 430 with negative refractive power has a convex object-side surface 432 and a concave image-side surface 434, and is aspheric, and the object-side surface 432 and the image-side surface 434 have an inflection point.
The fourth lens element 440 with positive refractive power has a concave object-side surface 442 and a convex image-side surface 444, and is aspheric, and the image-side surface 444 has an inflection point.
The fifth lens element 450 with negative refractive power is made of plastic, has a convex object-side surface 452 and a concave image-side surface 454, and is aspheric, wherein the object-side surface 452 has two inflection points and the image-side surface 454 has one inflection point. Thus, it is advantageous to shorten the back focal length to maintain miniaturization.
The infrared filter 480 is made of glass, and is disposed between the fifth lens element 450 and the image plane 490 without affecting the focal length of the optical imaging system.
Please refer to table seven and table eight below.
TABLE eighth, fourth example aspherical surface coefficients
In the fourth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.
According to the seventh and eighth tables, the following conditional values can be obtained:
according to the seventh and eighth tables, the following conditional values can be obtained:
fifth embodiment
Referring to fig. 5A and 5B, fig. 5A is a schematic diagram illustrating an optical imaging system according to a fifth embodiment of the present invention, and fig. 5B is a graph illustrating spherical aberration, astigmatism and optical distortion of the optical imaging system according to the fifth embodiment in order from left to right. Fig. 5C is a graph showing the visible light spectrum modulation conversion characteristics of the present embodiment. In fig. 5A, the optical imaging system includes, in order from an object side to an image side, a first lens element 510, an aperture stop 500, a second lens element 520, a third lens element 530, a fourth lens element 540, a fifth lens element 550, an infrared filter 580, an image plane 590 and an image sensor 592.
In the electronic device of the present embodiment, a mechanism aperture 501 may be disposed at the object side to limit the path of the incident light beam, and the diameter DDH of the mechanism aperture 501 is 1.978 mm. The distance between the mechanism light inlet 501 and the object side lens center (where the optical axis passes) of the first lens 510 is 0.2 mm.
The first lens element 510 with negative refractive power has a concave object-side surface 512 and a convex image-side surface 514, and is made of glass.
The second lens element 520 with positive refractive power has a convex object-side surface 522 and a convex image-side surface 524, and is aspheric, and the object-side surface 522 has a inflection point.
The third lens element 530 with negative refractive power has a concave object-side surface 532 and a concave image-side surface 534, and is aspheric, wherein the object-side surface 532 has four inflection points and the image-side surface 534 has an inflection point.
The fourth lens element 540 with positive refractive power is made of plastic, has a concave object-side surface 542 and a convex image-side surface 544, and is aspheric, and has an inflection point on the image-side surface 544.
The fifth lens element 550 with negative refractive power is made of plastic, has a convex object-side surface 552 and a concave image-side surface 554, and is aspheric, wherein the object-side surface 552 has four inflection points and the image-side surface 554 has one inflection point. Thus, it is advantageous to shorten the back focal length to maintain miniaturization.
The infrared filter 580 is made of glass, and is disposed between the fifth lens element 550 and the imaging plane 590 without affecting the focal length of the optical imaging system.
Please refer to table nine and table ten below.
Aspherical surface coefficients of Table ten and fifth example
In the fifth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.
The following conditional values are obtained according to table nine and table ten:
the following conditional values are obtained according to table nine and table ten:
sixth embodiment
Referring to fig. 6A and 6B, fig. 6A is a schematic diagram illustrating an optical imaging system according to a sixth embodiment of the present invention, and fig. 6B is a graph illustrating spherical aberration, astigmatism and optical distortion of the optical imaging system according to the sixth embodiment in order from left to right. Fig. 6C is a graph showing the visible light spectrum modulation conversion characteristics of the present embodiment. In fig. 6A, the optical imaging system includes, in order from an object side to an image side, a first lens element 610, an aperture stop 600, a second lens element 620, a third lens element 630, a fourth lens element 640, a fifth lens element 650, an ir-pass filter 680, an image plane 690, and an image sensor 692.
In the electronic device of the present embodiment, a mechanism aperture 601 may be disposed at the object side to limit the path of the incident light beam, and the diameter DDH of the mechanism aperture 601 is 1.990 mm. The distance between the mechanism light inlet 601 and the object side lens center (where the optical axis passes) of the first lens 610 is 0.2 mm.
The first lens element 610 with negative refractive power has a concave object-side surface 612 and a convex image-side surface 614.
The second lens element 620 with positive refractive power has a convex object-side surface 622 and a convex image-side surface 624, and is aspheric, and the object-side surface 622 has an inflection point.
The third lens element 630 with negative refractive power has a concave object-side surface 632, a concave image-side surface 634, and both aspheric surfaces, and the object-side surface 632 has an inflection point.
The fourth lens element 640 with positive refractive power is made of plastic, has a concave object-side surface 642 and a convex image-side surface 644, and is aspheric, and the image-side surface 644 has an inflection point.
The fifth lens element 650 with negative refractive power has a convex object-side surface 652 and a concave image-side surface 654, and is aspheric, wherein the object-side surface 652 has two inflection points and the image-side surface 654 has one inflection point. Thus, it is advantageous to shorten the back focal length to maintain miniaturization. In addition, the incident angle of the light rays in the off-axis field can be effectively suppressed, and the aberration of the off-axis field can be further corrected.
The ir filter 680 is made of glass, and is disposed between the fifth lens element 650 and the image plane 690 without affecting the focal length of the optical imaging system.
Please refer to the following table eleven and table twelve.
TABLE twelfth and sixth examples of aspherical surface coefficients
In the sixth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.
The following conditional values were obtained according to table eleven and table twelve:
the following conditional values were obtained according to table eleven and table twelve:
although the present invention has been described with reference to the above embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but may be modified and practiced by those skilled in the art without departing from the spirit and scope of the invention.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims and their equivalents.
Claims (25)
1. An optical imaging system, in order from an object side to an image side comprising:
a first lens element with refractive power;
a second lens element with refractive power;
a third lens element with refractive power;
a fourth lens element with refractive power;
a fifth lens element with refractive power; and
an imaging plane, wherein the optical imaging system has five lens elements with refractive power, at least one of the first lens element to the fifth lens element has positive refractive power, the first lens element is made of glass, at least one of the second lens element to the fifth lens element is made of plastic, focal lengths of the first lens element to the fifth lens element are f1, f2, f3, f4 and f5, respectively, the focal length of the optical imaging system is f, an entrance pupil diameter of the optical imaging system is HEP, a distance from an object-side surface of the first lens element to the imaging plane on the optical axis is HOS, a distance from an object-side surface of the first lens element to an image-side surface of the fifth lens element on the optical axis is InTL, the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the imaging plane, thicknesses of the first lens element to the fifth lens element on a 1/2HEP height and parallel to the optical axis are ETP1, ETP2, respectively, ETP3, ETP4, and ETP5, a total of the ETP1 to ETP5 being SETP, thicknesses of the first lens to the fifth lens in the optical axis being TP1, TP2, TP3, TP4, and TP5, respectively, a total of the TP1 to TP5 being STP, which satisfies the following conditions: f/HEP is more than or equal to 1.0 and less than or equal to 10; HOS/f is more than or equal to 0.5 and less than or equal to 3; and 0.5 is less than or equal to SETP/STP <1.
2. The optical imaging system of claim 1, wherein half of the maximum viewing angle of the optical imaging system is the HAF, which satisfies the following equation: 0deg < HAF ≤ 50 deg.
3. The optical imaging system of claim 1, wherein the second lens element to the fifth lens element are made of plastic.
4. The optical imaging system of claim 1, wherein the first lens has a refractive index Nd1, which satisfies the following formula: nd1 is more than or equal to 1.70 and less than or equal to 3.0.
5. The optical imaging system of claim 1, wherein the first lens has a thickness TP1, which satisfies the following equation: TP1 is more than or equal to 0.5mm and less than or equal to 0.9 mm.
6. The optical imaging system of claim 1, wherein a horizontal distance parallel to the optical axis between a coordinate point at 1/2HEP height on the object-side surface of the first lens element and the image plane is ETL, and a horizontal distance parallel to the optical axis between a coordinate point at 1/2HEP height on the object-side surface of the first lens element and a coordinate point at 1/2HEP height on the image-side surface of the fourth lens element is EIN, wherein the following conditions are satisfied: EIN/ETL is more than or equal to 0.2 and less than 1.
7. The optical imaging system of claim 1, wherein the thicknesses of the first through fifth lenses at 1/2HEP height and parallel to the optical axis are ETP1, ETP2, ETP3, ETP4 and ETP5, respectively, the sum of the aforementioned ETP1 through ETP5 is SETP, which satisfies the following formula: SETP/EIN is more than or equal to 0.2 and less than 1.
8. The optical imaging system of claim 1, wherein the optical axis, 0.3HOI and 0.7HOI on the imaging plane, and the modulation conversion contrast transfer ratios at the spatial frequency of 110cycles/mm are respectively expressed by MTFQ0, MTFQ3 and MTFQ7, which satisfy the following conditions: MTFQ0 is more than or equal to 0.2; MTFQ3 is more than or equal to 0.01; and MTFQ7 is more than or equal to 0.01.
9. The optical imaging system of claim 1, further comprising an aperture stop, and the distance between the aperture stop and the imaging plane on the optical axis is InS, which satisfies the following formula: 0.2-1.1 of InS/HOS.
10. An optical imaging system, in order from an object side to an image side comprising:
a first lens made of glass and having a planar object-side surface and an image-side surface;
a second lens element with refractive power;
a third lens element with refractive power;
a fourth lens element with refractive power;
a fifth lens element with refractive power; and
an imaging plane, wherein the optical imaging system has five lens elements with refractive power, at least one of the first to fifth lens elements has positive refractive power, the second to fifth lens elements are made of plastic, focal lengths of the first to fifth lens elements are f1, f2, f3, f4 and f5, respectively, the focal length of the optical imaging system is f, an entrance pupil diameter of the optical imaging system is HEP, a distance from an object-side surface of the first lens element to the imaging plane on an optical axis is HOS, a distance from an object-side surface of the first lens element to an image-side surface of the fifth lens element on the optical axis is invl, the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the imaging plane, a horizontal distance from a coordinate point of 1/2HEP height on the object-side surface of the first lens element to the imaging plane parallel to the optical axis is ETL, the horizontal distance parallel to the optical axis between the coordinate point at the 1/2HEP height on the object side surface of the first lens and the coordinate point at the 1/2HEP height on the image side surface of the fourth lens is EIN, which satisfies the following conditions: f/HEP is more than or equal to 1.0 and less than or equal to 10; HOS/f is more than or equal to 0.5 and less than or equal to 3; and EIN/ETL is more than or equal to 0.2 and less than 1.
11. The optical imaging system of claim 10, wherein half of the maximum viewing angle of the optical imaging system is the HAF, which satisfies the following equation: 0deg < HAF ≤ 50 deg.
12. The optical imaging system of claim 10, wherein the first lens has a thickness TP1, and the third lens has a thickness TP3, which satisfies the following equation: TP1> TP 3.
13. The optical imaging system of claim 10, wherein the distance between the third lens element and the fourth lens element on the optical axis is IN34, and satisfies the following formula: IN34 is more than or equal to 0.5mm and less than or equal to 0.7 mm.
14. The optical imaging system of claim 10, wherein an axial distance between the third lens element and the fourth lens element is IN34, and an axial distance between the fourth lens element and the fifth lens element is IN45, which satisfies the following formula: IN34> IN 45.
15. The optical imaging system of claim 10, wherein the optical imaging system satisfies the following equation: f2> f 3.
16. The optical imaging system of claim 10, wherein a horizontal distance between a coordinate point on the image-side surface of the fifth lens element at 1/2HEP height and the image plane parallel to the optical axis is EBL, and a horizontal distance between an intersection point of the image-side surface of the fifth lens element and the optical axis and the image plane parallel to the optical axis is BL, which satisfies the following formula: EBL/BL is more than or equal to 0.2 and less than 1.1.
17. The optical imaging system of claim 10, wherein the optical imaging system comprises a filter element disposed between the fifth lens element and the imaging surface, a distance between a coordinate point on the image side surface of the fifth lens element at a height of 1/2HEP and the filter element parallel to the optical axis is EIR, a distance between an intersection point on the image side surface of the fifth lens element and the optical axis and the filter element parallel to the optical axis is PIR, and the following formula is satisfied: EIR/PIR is more than or equal to 0.1 and less than 1.
18. The optical imaging system of claim 10, wherein the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the imaging plane, and the optical axis, 0.3HOI and 0.7HOI on the imaging plane have three modulation-conversion contrast transfer rates at a spatial frequency of 220cycles/mm, respectively denoted by MTFH0, MTFH3 and MTFH7, which satisfy the following condition: MTFQ0 is more than or equal to 0.2; MTFQ3 is more than or equal to 0.01; and MTFQ7 is more than or equal to 0.01.
19. The optical imaging system of claim 10, wherein at least one of the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element is a light filtering element with a wavelength less than 500 nm.
20. An optical imaging system, in order from an object side to an image side comprising:
a mechanism light inlet hole which limits the path of the incident light of the object side and has a diameter DDH;
a first lens made of glass and having a planar object-side surface and an image-side surface;
a second lens element with refractive power;
a third lens element with refractive power;
a fourth lens element with refractive power;
a fifth lens element with refractive power; and
an image plane, wherein at least one of the second lens element to the fifth lens element has positive refractive power, the second lens element to the fifth lens element is made of plastic, focal lengths of the first lens element to the fifth lens element are f1, f2, f3, f4, and f5, respectively, the focal length of the optical imaging system is f, an entrance pupil diameter of the optical imaging system is HEP, a distance on the optical axis from the object-side surface of the first lens element to the image plane is HOS, a distance on the optical axis from the object-side surface of the first lens element to the image-side surface of the fifth lens element is InTL, the optical imaging system has a maximum imaging height HOI on the image plane perpendicular to the optical axis, a horizontal distance on the optical axis between a coordinate point on the object-side surface of the first lens element at a HEP height of 1/2 and the image plane is ETL, and a horizontal distance on the object-side surface of the first lens element from a coordinate point on the object-side surface at a HEP height of 1/2 to a coordinate point on the image-side surface of the fifth lens element at a HEP height of the image plane is EIN, it satisfies the following conditions: f/HEP is more than or equal to 1.0 and less than or equal to 10; HOS/f is more than or equal to 0.5 and less than or equal to 3; DDH is more than 0mm and less than or equal to 10 mm; and EIN/ETL is more than or equal to 0.2 and less than 1.
21. The optical imaging system of claim 20, wherein half of the maximum viewing angle of the optical imaging system is the HAF, which satisfies the following equation: 0deg < HAF ≤ 50 deg.
22. The optical imaging system of claim 20, wherein the distance d between the center of the light entrance hole of the mechanism and the center of the object-side surface of the first lens on the optical axis satisfies the following formula: d is less than or equal to 1 mm.
23. The optical imaging system of claim 20, wherein the first lens has a refractive index Nd1, which satisfies the following equation: nd1 is more than or equal to 1.70 and less than or equal to 3.0.
24. The optical imaging system of claim 20, wherein the first lens has a thickness TP1, which satisfies the following equation: TP1 is more than or equal to 0.5mm and less than or equal to 0.9 mm.
25. The optical imaging system of claim 20, further comprising an aperture stop, an image sensor disposed on the image plane and located at an axial distance InS from the aperture stop to the image plane, and a driving module capable of coupling with the first lens element to the fifth lens element and displacing the first lens element to the fifth lens element, wherein the following formula is satisfied: 0.2-1.1 of InS/HOS.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW109201111 | 2020-01-30 | ||
| TW109201111U TWM598410U (en) | 2020-01-30 | 2020-01-30 | Optical image capturing system |
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| CN211928285U true CN211928285U (en) | 2020-11-13 |
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| TW (1) | TWM598410U (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI780399B (en) * | 2020-01-30 | 2022-10-11 | 先進光電科技股份有限公司 | Optical image capturing system |
| TWI797816B (en) * | 2021-11-05 | 2023-04-01 | 大立光電股份有限公司 | Image capturing system lens assembly, imaging apparatus and electronic device |
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2020
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