CN109001894B - Small-distortion high-low-temperature-resistant prime lens - Google Patents
Small-distortion high-low-temperature-resistant prime lens Download PDFInfo
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- CN109001894B CN109001894B CN201811226193.7A CN201811226193A CN109001894B CN 109001894 B CN109001894 B CN 109001894B CN 201811226193 A CN201811226193 A CN 201811226193A CN 109001894 B CN109001894 B CN 109001894B
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- 239000011521 glass Substances 0.000 claims abstract description 42
- 230000003287 optical effect Effects 0.000 claims abstract description 41
- 238000003384 imaging method Methods 0.000 claims abstract description 13
- 230000005499 meniscus Effects 0.000 claims description 20
- 125000006850 spacer group Chemical group 0.000 claims description 11
- 229910001374 Invar Inorganic materials 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 3
- 230000004075 alteration Effects 0.000 abstract description 10
- 230000035699 permeability Effects 0.000 abstract description 2
- 239000006185 dispersion Substances 0.000 description 6
- 239000000956 alloy Substances 0.000 description 5
- 229920000106 Liquid crystal polymer Polymers 0.000 description 4
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000002848 electrochemical method Methods 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- 239000003365 glass fiber Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
Abstract
The invention discloses a small-distortion high-low-temperature-resistant fixed-focus lens, and relates to the field of fixed-focus lenses. The fixed focus lens comprises a first lens, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, an optical filter and imaging equipment, and light rays emitted from an object sequentially pass through the first lens, the diaphragm, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the optical filter and then are imaged on the imaging equipment. The fixed focus lens has excellent permeability, performs aberration and chromatic aberration correction, and solves the problem of purple fringing of visible light wave band imaging. The all-glass fixed focus lens has the characteristics of small distortion, large aperture, compact structure and small incidence angle of principal ray of an image plane when the corresponding chip size is 1/2.9 inch, can maintain excellent performance in high and low temperature (-40 ℃ to 105 ℃) environments, and has good reliability.
Description
Technical Field
The invention relates to the field of fixed focus lenses, in particular to a fixed focus lens with small distortion and high and low temperature resistance.
Background
In recent years, in the field of security protection, the requirements of the market on security protection monitoring lenses are higher and higher, such as high definition imaging requirements, purple fringing, less stray light, short and small size requirements, and adaptability to severe high and low temperature environments, water resistance, scratch resistance and the like. Among them, a lens with a focal length of about 8mm is widely used in various fields because of its relatively moderate observation range. The existing lens with large aperture and focal length of about 8mm meets the requirements of high definition, low distortion and the like, and the number of the used lenses is relatively large, so that the lens is complex in structure and large in volume; in order to adapt to harsh high-low temperature environments, the lens base is processed by adopting a metal material, and the lens is aspheric, so that the cost is high.
Disclosure of Invention
The invention aims to provide a small-distortion high-low temperature resistant fixed focus lens, which solves the problems that the total optical length is large and the lens cannot adapt to severe high-low temperature environments.
In order to achieve the above object, the present invention provides the following solutions:
a small-distortion high-low temperature resistant fixed focus lens comprises: a first lens, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and an optical filter.
Light rays emitted from an object sequentially pass through the first lens, the diaphragm, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the optical filter, and then are imaged on an imaging device.
The first lens is a biconcave glass lens having negative optical power.
The second lens is a biconvex glass lens having positive optical power.
The third lens is a biconvex glass lens having positive optical power.
The fourth lens is a biconcave glass lens having negative optical power.
The exit surface of the third lens is glued with the entrance surface of the fourth lens.
The fifth lens is a meniscus glass lens with positive focal power, the incident surface of the fifth lens is a concave surface of the meniscus glass lens, and the emergent surface of the fifth lens is a convex surface of the meniscus glass lens.
The sixth lens is a meniscus glass lens with positive focal power, the incident surface of the sixth lens is a convex surface of the meniscus glass lens, and the emergent surface of the sixth lens is a concave surface of the meniscus glass lens.
Optionally, the fixed focus lens further includes:
lens barrel and end cap.
The end cover is arranged at one end of the lens barrel, the optical filter is glued at the other end of the lens barrel, and the first lens, the diaphragm, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are sequentially arranged in the end cover, the lens barrel and the optical filter.
Optionally, the fixed focus lens further includes: a plurality of spacers;
the spacer is arranged between the first lens and the second lens, between the second lens and the third lens, between the fourth lens and the fifth lens, between the fifth lens and the sixth lens and between the end cover and the lens barrel.
Optionally, the spacer ring between the first lens and the second lens is made of invar alloy or super invar alloy material, and then is subjected to surface treatment by an electrochemical method.
Optionally, the refractive index of the first lens is less than or equal to 1.70, and the abbe number of the first lens is less than or equal to 35;
the refractive index of the second lens is more than or equal to 1.90, and the Abbe number of the second lens is less than or equal to 40;
the refractive index of the third lens is less than or equal to 1.65, and the Abbe number of the third lens is more than or equal to 60;
the refractive index of the fourth lens is more than or equal to 1.80, and the Abbe number of the fourth lens is less than or equal to 30;
the refractive index of the fifth lens is more than or equal to 1.75, and the Abbe number of the fifth lens is less than or equal to 50;
the refractive index of the sixth lens is more than or equal to 1.80, and the Abbe number of the sixth lens is less than or equal to 45;
and the difference value between the refractive index of the fourth lens and the refractive index of the third lens is more than or equal to 0.20, and the difference value between the Abbe number of the third lens and the Abbe number of the fourth lens is more than or equal to 30.
Optionally, the first lens is a front group lens, and the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens form a rear group lens group.
Optionally, a ratio of a focal length of the front group lens to a combined focal length of the rear group lens is greater than-1 and less than 0.
Optionally, the optical filter is an optical component that passes visible light in a wavelength band of 436nm to 656 nm.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention provides a small-distortion high-low-temperature-resistant fixed-focus lens, which comprises a first lens, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, an optical filter and imaging equipment, wherein light rays emitted from an object sequentially pass through the first lens, the diaphragm, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the optical filter and then are imaged on the imaging equipment. The fixed focus lens has excellent permeability, performs aberration and chromatic aberration correction, and solves the problem of purple fringing of visible light wave band imaging. The all-glass fixed focus lens has the characteristics of small distortion, large aperture, compact structure and small incidence angle of principal ray of an image plane when the corresponding chip size is 1/2.9 inch, and can keep excellent performance and good reliability in high and low temperature (-40 ℃ to 105 ℃) environments.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a lens structure with small distortion and high and low resistance Wen Dingjiao according to an embodiment of the invention;
FIG. 2 is a schematic view of an optical path of a lens Wen Dingjiao with low distortion and high/low resistance according to an embodiment of the present invention;
FIG. 3 is a point column diagram of a low distortion, high and low resistant Wen Dingjiao lens in accordance with an embodiment of the present invention at 436-656nm of visible light;
FIG. 4 is a graph showing MTF of a lens with small distortion and high and low resistance Wen Dingjiao at a temperature of 20 ℃ and 436-656nm in visible light according to an embodiment of the invention;
FIG. 5 is a graph showing curvature of field and distortion of a lens Wen Dingjiao with low distortion and high and low resistance at 436-656nm of visible light according to an embodiment of the invention;
FIG. 6 is a graph of the relative illuminance of a lens of low distortion and high and low resistance Wen Dingjiao at 436-656nm of visible light according to an embodiment of the present invention;
FIG. 7 is a graph of the defocus MTF of a low distortion, high and low resistant Wen Dingjiao lens at 436-656nm of visible light according to an embodiment of the present invention;
FIG. 8 is a graph of chromatic aberration of magnification of a lens Wen Dingjiao with low distortion and high and low resistance at 436-656nm in an embodiment of the invention;
FIG. 9 is a graph showing MTF of a lens with small distortion and high and low resistance Wen Dingjiao at 436-656nm and 40 ℃ in accordance with an embodiment of the present invention;
FIG. 10 is a graph showing the MTF of a small distortion, high and low resistant Wen Dingjiao lens at 105℃and 436-656nm in visible light according to an embodiment of the present invention.
1, a first lens; 2. a diaphragm; 3. a second lens; 4. a third lens; 5. a fourth lens; 6. a fifth lens; 7. a sixth lens; 8. an optical filter.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
FIG. 1 is a schematic diagram of a lens structure with small distortion and high and low resistance Wen Dingjiao according to an embodiment of the invention; fig. 2 is a schematic view of an optical path of a small distortion, high and low tolerant Wen Dingjiao lens according to an embodiment of the invention.
Referring to fig. 1 and 2, a small-distortion high-low temperature resistant fixed focus lens provided by an embodiment of the invention includes: a first lens 1, a diaphragm 2, a second lens 3, a third lens 4, a fourth lens 5, a fifth lens 6, a sixth lens 7 and a filter 8.
Light rays emitted from an object sequentially pass through the first lens 1, the diaphragm 2, the second lens 3, the third lens 4, the fourth lens 5, the fifth lens 6, the sixth lens 7 and the optical filter 8, and are imaged on an imaging device.
The first lens 1 is a biconcave glass lens having negative optical power.
The second lens 3 is a biconvex glass lens having positive optical power.
The third lens 4 is a biconvex glass lens having positive optical power.
The fourth lens 5 is a biconcave glass lens having negative optical power.
The exit surface of the third lens 4 and the entrance surface of the fourth lens 5 are glued together;
the fifth lens 6 is a meniscus glass lens with positive optical power, the incident surface of the fifth lens 6 is a concave surface of the meniscus glass lens, and the exit surface of the fifth lens 6 is a convex surface of the meniscus glass lens.
The sixth lens 7 is a meniscus glass lens with positive power, the incident surface of the sixth lens 7 is a convex surface of the meniscus glass lens, and the exit surface of the sixth lens 7 is a concave surface of the meniscus glass lens.
Preferably, the fixed focus lens provided by the embodiment of the present invention further includes:
a lens barrel and an end cap; the end cover is arranged at one end of the lens barrel, the optical filter 8 is glued at the other end of the lens barrel, and the first lens 1, the diaphragm 2, the second lens 3, the third lens 4, the fourth lens 5, the fifth lens 6 and the sixth lens 7 are sequentially arranged in the end cover, the lens barrel and the optical filter 8.
Preferably, the fixed focus lens provided by the embodiment of the present invention further includes: a plurality of spacers; the space rings are respectively arranged between the first lens 1 and the second lens 3, between the second lens 3 and the third lens 4, between the fourth lens 5 and the fifth lens 6, between the fifth lens 6 and the sixth lens 7 and between the end cover and the lens barrel, so that the lens is prevented from being collided.
The spacer rings of the first lens 1 and the second lens 3 are firstly manufactured by adopting invar alloy or super invar alloy materials, and then are subjected to surface treatment by an electrochemical method to reduce stray light.
The lens base is made of a material with a thermal expansion coefficient of about 50 x 10 (-6)/DEG C, and the material is preferably glass fiber LCP (LCP: reinforced liquid crystal polymer) or Polycarbonate (PC). The lens is matched with a lens seat, can be used for leading in a visible light wave band of 436nm to 656nm and is applied to security monitoring camera shooting, and has the characteristics of small distortion (distortion is lower than 1.6 percent), high and low temperature resistance (-40 ℃ to 105 ℃), large aperture (F/# = 1.8), compact and reasonable structure (total optical length Total Track Length, TTL is less than or equal to 24 mm), anti-ultraviolet edge, small image plane Chief Ray incidence Angle (CRA, chief Ray Angle), and the like when the corresponding chip size is 1/2.9 inches.
The first lens 1 is a biconcave glass lens with low refractive index and high dispersion, one surface of the first lens 1 facing the object side is a concave surface, the other surface of the first lens 1 facing the image side is also a concave surface, and the refractive index (nd 1) of the first lens 1 is less than or equal to 1.70 and the Abbe number (Vd 1) is less than or equal to 35.
The second lens 3 is a biconvex glass lens with high refractive index and high dispersion, one surface of the second lens 3 facing the object space is a convex surface, the other surface of the second lens 3 facing the image space is also a convex surface, and the refractive index (nd 2) of the second lens 3 is more than or equal to 1.90 and the Abbe number (Vd 2) is less than or equal to 40.
The third lens 4 is a biconvex glass lens with low refractive index and low dispersion, one surface of the third lens 4 facing the object side is a convex surface, the other surface of the third lens 4 facing the image side is also a convex surface, the refractive index (nd 3) of the third lens 4 is less than or equal to 1.65, and the Abbe number (Vd 3) is more than or equal to 60.
The fourth lens 5 is a double concave glass lens with high refractive index and high dispersion, one surface of the fourth lens 5 facing the object side is a concave surface, the other surface of the fourth lens 5 facing the image side is also a concave surface, and the refractive index (nd 4) of the fourth lens 5 is more than or equal to 1.80 and Abbe number (Vd 4) is less than or equal to 30.
The fifth lens 6 is a high-refractive-index and high-dispersion meniscus glass lens, one surface of the fifth lens 6 facing the object side is a concave surface, the other surface of the fifth lens 6 facing the image side is a convex surface, and the refractive index (nd 5) of the fifth lens 6 is more than or equal to 1.75 and the Abbe number (Vd 5) is less than or equal to 50.
The sixth lens 7 is a high-refractive-index and high-dispersion meniscus glass lens, one surface of the sixth lens 7 facing the object side is a convex surface, the other surface of the sixth lens 7 facing the image side is a concave surface, and the refractive index (nd 6) of the sixth lens 7 is more than or equal to 1.80 and the Abbe number (Vd 6) is less than or equal to 45.
The third lens 4 and the fourth lens 5 are glued to form a glued lens with negative focal power, and the convex surface of the third lens 4 facing the image space and the concave surface of the fourth lens 5 facing the object space are glued surfaces. The refractive index (nd 4) of the fourth lens 5 and the refractive index (nd 3) of the third lens 4 are different from each other in the range of nd4-nd3 being more than or equal to 0.20, and the Abbe number (Vd 3) of the third lens 4 and the Abbe number (Vd 4) of the fourth lens 5 are different from each other in the range of Vd3-Vd4 being more than or equal to 30.
The lens is divided into a front group lens and a rear group lens by taking a diaphragm as a boundary, wherein the first lens 1 is a front group lens, the second lens 3, the third lens 4, the fourth lens 5, the fifth lens 6 and the sixth lens 7 form a rear group lens group, and the focal length of the front group lens is denoted as f f The combined focal length of the rear group lens group is denoted as f b Focal length f of front group lens f Combined focal length f with the rear group lens group b The ratio of (C) is-1<f b /f f <0。
The optical filter 8 is an infrared cut-off optical filter or blue glass, the spectral reflectivity of the visible light wave band of the optical filter 8 is low, and the rest wave bands are cut off.
FIG. 3 is a plot of the point of the low distortion, high and low resistant Wen Dingjiao lens of an embodiment of the invention at 436-656nm visible light. Referring to fig. 3, the wavelengths are taken as g light, F light, e light, d light and C light, the g light is 436nm visible light, the F light is 486nm visible light, the e light is 546nm visible light, the d light is 588nm visible light, the C light is 656nm visible light, and the weight ratio is 3:7:10:8:3. As can be seen from fig. 3, the diffuse spots in each view field are concentrated and distributed uniformly. Meanwhile, the phenomenon that the diffuse spots are separated up and down along with the wavelength under a certain visual field does not occur, which indicates that the purple fringing is better eliminated. The invention only uses 6 lenses, the number of lenses is less, and the lens has simple structure and small volume.
The fixed focus lens has excellent transmittance for five wavelengths of g light (436 nm), F light (486 nm), e light (546 nm), d light (588 nm) and C light (656 nm) in terms of spectral transmittance, and performs aberration and chromatic aberration correction, thereby solving the problem of ultraviolet imaging in the visible light wave band.
FIG. 4 is a graph of MTF (modulation transfer function: modulation Transfer Function) at 20℃with a small distortion, high and low resistant Wen Dingjiao lens in accordance with an embodiment of the present invention at 436-656nm in visible light. The MTF graph represents the comprehensive resolution level of an optical system, and as can be seen from FIG. 4, the full-field MTF value at 150lp/mm is more than or equal to 0.2, and the imaging is clearer.
FIG. 5 is a graph showing curvature of field and distortion of a low distortion, high and low resistant Wen Dingjiao lens at 436-656nm of visible light according to an embodiment of the invention. The distortion graph shows the magnitude of the conventional optical distortion (F-Tan (theta)) distortion in% for different angles of view. As can be seen from FIG. 5, the optical distortion is barrel distortion, the absolute value of which is less than or equal to 1.60%.
FIG. 6 is a graph of the relative illuminance of a small distortion, high and low resistant Wen Dingjiao lens at 436-656nm of visible light according to an embodiment of the present invention. As can be seen from fig. 6, the curve is smoothly dropped, the relative illuminance value at the maximum field is > 0.548, and the imaged picture is bright.
FIG. 7 is a graph of the defocus MTF of a small distortion, high and low resistant Wen Dingjiao lens of an embodiment of the present invention at a visible light of 436-656nm, with a spatial frequency of 75lp/mm and a defocus range of-0.03 mm to 0.03mm. FIG. 7 may reflect the extent of field curvature correction, when a system has field curvature, and as a result, the center and periphery cannot be simultaneously clear, i.e., the center of the field of view is adjusted to the clearest, but the edges are not clear enough; the edges of the field of view need to be made clear by reducing the sharpness of the center of the field of view by recalling. As can be seen from fig. 7, the field curvature correction of the fixed focus lens of the present invention is good.
FIG. 8 is a graph showing the chromatic aberration of magnification of a lens with small distortion and high/low resistance Wen Dingjiao under 436-656nm of visible light, wherein the degree of chromatic aberration of magnification correction can be known by combining the size of the pixel particles with FIG. 8. As can be seen from FIG. 8, the chromatic aberration of magnification of the fixed focus lens of the present invention is better corrected, and the purple fringing is eliminated.
Fig. 9 is a graph of MTF at 436-656nm and-40 ℃ for a small distortion, high and low resistant Wen Dingjiao lens according to an embodiment of the invention, and fig. 10 is a graph of MTF at 436-656nm and 105 ℃ for a small distortion, high and low resistant Wen Dingjiao lens according to an embodiment of the invention. Wherein the coefficient of thermal expansion of the lens holder is set to 50 x 10 (-6)/DEG C, the coefficient of thermal expansion of the spacer between the first lens 1 and the second lens 3 is set to 0.9 x 10 (-6)/DEG C, and the coefficient of thermal expansion of the lens barrel and other spacers is set to 23.2 x 10 (-6)/DEG C. As can be seen from FIGS. 9 and 10, the MTF value of the full field of view at 150lp/mm is basically equal to or more than 0.2 in the high and low temperature environment, and the definition is relatively stable.
In the embodiment of the present invention, starting from the object side, the respective mirrors are numbered in order, the concave surface of the first lens 1 facing the object side is R1, the concave surface of the first lens 1 facing the image side is R2, the number Stop of the aperture Stop of the second lens 2, the convex surface of the second lens 3 facing the object side is R4, the convex surface of the second lens 3 facing the image side is R5, the convex surface of the third lens 4 facing the object side is R6, the bonding surface of the third lens 4 and the fourth lens 5 is R7, the concave surface of the fourth lens 5 facing the image side is R8, the concave surface of the fifth lens 6 facing the object side is R9, the convex surface of the fifth lens 6 facing the image side is R10, the convex surface of the sixth lens 7 facing the object side is R11, the concave surface of the sixth lens 7 facing the image side is R12, the filter 8 facing one surface of the object side is 13, the filter 8 facing the image side is 14, the image sensor surface protection glass facing the object side is 15, and the image sensor surface protection glass facing the image side is 16. The final Image Plane, i.e. the receiving surface of the Image sensor, indicated by IMA.
Preferred parameter values for the present invention are as follows:
efl=8.16 mm, fno=1.8, fov=42°, ttl=24.00 mm, CRA is no more than 11.21 °, where EFL is the overall focal length value of the optical lens, FNO is the aperture value, FOV is the field angle, TTL is the total optical length of the lens, CRA is the image plane chief ray incidence angle. The photosensitive imaging chip is OV2718 of OmniVision, unit: mm.
Table 1 example table of lens parameters
The spacer between the first lens and the second lens is processed by super invar alloy 4J32, and then surface treatment is carried out by an electrochemical method; the lens cone and the other space ring are processed by adopting metal aluminum, and then are subjected to anodic oxidation blackening treatment; the matched lens seat is processed by adopting glass fiber reinforced LCP or PC, thereby reducing the cost.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (8)
1. A small distortion, high-low temperature resistant fixed focus camera lens, characterized by comprising: a first lens, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and an optical filter;
light rays emitted from an object sequentially pass through the first lens, the diaphragm, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the optical filter and then are imaged on an imaging device;
the first lens is a biconcave glass lens with negative focal power;
the second lens is a biconvex glass lens with positive focal power;
the third lens is a biconvex glass lens with positive focal power;
the fourth lens is a biconcave glass lens with negative focal power;
the emergent surface of the third lens and the incident surface of the fourth lens are glued together;
the fifth lens is a meniscus glass lens with positive focal power, the incident surface of the fifth lens is a concave surface of the meniscus glass lens, and the emergent surface of the fifth lens is a convex surface of the meniscus glass lens;
the sixth lens is a meniscus glass lens with positive focal power, the incident surface of the sixth lens is a convex surface of the meniscus glass lens, and the emergent surface of the sixth lens is a concave surface of the meniscus glass lens;
the filter is an infrared cut-off filter or blue glass.
2. The fixed focus lens of claim 1, further comprising:
a lens barrel and an end cap;
the end cover is arranged at one end of the lens barrel, the optical filter is glued at the other end of the lens barrel, and the first lens, the diaphragm, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are sequentially arranged in the end cover, the lens barrel and the optical filter.
3. The fixed focus lens of claim 2, further comprising: a plurality of spacers;
the spacer is arranged between the first lens and the second lens, between the second lens and the third lens, between the fourth lens and the fifth lens, between the fifth lens and the sixth lens and between the end cover and the lens barrel.
4. A fixed focus lens as claimed in claim 3, wherein said spacer between said first and second lenses is fabricated from invar or super invar material and is surface treated electrochemically.
5. The fixed focus lens of claim 1, wherein,
the refractive index of the first lens is less than or equal to 1.70, and the Abbe number of the first lens is less than or equal to 35;
the refractive index of the second lens is more than or equal to 1.90, and the Abbe number of the second lens is less than or equal to 40;
the refractive index of the third lens is less than or equal to 1.65, and the Abbe number of the third lens is more than or equal to 60;
the refractive index of the fourth lens is more than or equal to 1.80, and the Abbe number of the fourth lens is less than or equal to 30;
the refractive index of the fifth lens is more than or equal to 1.75, and the Abbe number of the fifth lens is less than or equal to 50;
the refractive index of the sixth lens is more than or equal to 1.80, and the Abbe number of the sixth lens is less than or equal to 45;
and the difference value between the refractive index of the fourth lens and the refractive index of the third lens is more than or equal to 0.20, and the difference value between the Abbe number of the third lens and the Abbe number of the fourth lens is more than or equal to 30.
6. The fixed focus lens of claim 1, wherein the first lens is a front group lens, and the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens form a rear group lens group.
7. The fixed focus lens of claim 6, wherein a ratio of a focal length of the front group lens to a combined focal length of the rear group lens is greater than-1 and less than 0.
8. The fixed focus lens of claim 1, wherein the optical filter is an optical component that passes visible light in a 436nm to 656nm wavelength band.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811226193.7A CN109001894B (en) | 2018-10-22 | 2018-10-22 | Small-distortion high-low-temperature-resistant prime lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811226193.7A CN109001894B (en) | 2018-10-22 | 2018-10-22 | Small-distortion high-low-temperature-resistant prime lens |
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| CN116299982B (en) * | 2023-05-11 | 2023-09-05 | 宁波永新光学股份有限公司 | Long-focus receiving optical system of low-temperature drift laser radar |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002258156A (en) * | 2000-12-26 | 2002-09-11 | Nikon Corp | Image forming optical system |
| CN101614864A (en) * | 2009-06-09 | 2009-12-30 | 宁波舜宇车载光学技术有限公司 | Super wide angle mega pixel vehicle-mounted lens |
| CN108333730A (en) * | 2018-04-12 | 2018-07-27 | 厦门爱劳德光电有限公司 | A kind of high definition ultra-wide angle day and night confocal camera lens |
| CN108388004A (en) * | 2018-03-26 | 2018-08-10 | 河南翊轩光电科技有限公司 | A kind of starlight grade high definition day and night confocal optics camera lens |
| CN208833989U (en) * | 2018-10-22 | 2019-05-07 | 厦门爱劳德光电有限公司 | It is a kind of it is small distortion, high-low temperature resistant tight shot |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002258156A (en) * | 2000-12-26 | 2002-09-11 | Nikon Corp | Image forming optical system |
| CN101614864A (en) * | 2009-06-09 | 2009-12-30 | 宁波舜宇车载光学技术有限公司 | Super wide angle mega pixel vehicle-mounted lens |
| CN108388004A (en) * | 2018-03-26 | 2018-08-10 | 河南翊轩光电科技有限公司 | A kind of starlight grade high definition day and night confocal optics camera lens |
| CN108333730A (en) * | 2018-04-12 | 2018-07-27 | 厦门爱劳德光电有限公司 | A kind of high definition ultra-wide angle day and night confocal camera lens |
| CN208833989U (en) * | 2018-10-22 | 2019-05-07 | 厦门爱劳德光电有限公司 | It is a kind of it is small distortion, high-low temperature resistant tight shot |
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