CN114942516B - Compact image space telecentric optical system - Google Patents
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- CN114942516B CN114942516B CN202210619973.8A CN202210619973A CN114942516B CN 114942516 B CN114942516 B CN 114942516B CN 202210619973 A CN202210619973 A CN 202210619973A CN 114942516 B CN114942516 B CN 114942516B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 49
- 230000005499 meniscus Effects 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 18
- 239000011521 glass Substances 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 229910052738 indium Inorganic materials 0.000 claims description 5
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- 125000006850 spacer group Chemical group 0.000 claims 3
- 238000005286 illumination Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 7
- 238000012546 transfer Methods 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000005357 flat glass Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/22—Telecentric objectives or lens systems
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
Abstract
The invention relates to a compact image space telecentric optical system, which is sequentially provided with a protection window with the same optical axis, a first lens and a second lens with negative diopter, a third lens with positive diopter, a fourth lens with negative diopter, a diaphragm, a fifth lens and a sixth lens with positive diopter, a seventh lens with negative diopter, an eighth lens and a ninth lens with positive diopter, a CCD window and an image plane along the light propagation direction; the first lens is a negative meniscus lens protruding to the object space; the second lens is a biconcave lens; the third lens is a biconvex lens; the fourth lens is a negative meniscus lens protruding to the object space; the fifth lens is a positive meniscus lens protruding towards the image space; a sixth lens biconvex lens; the seventh lens is a biconcave lens; the eighth lens is a biconvex lens; the ninth lens is a biconvex lens; the invention has the advantages of large view field, excellent illumination uniformity of the image surface and good system reliability.
Description
Technical Field
The invention belongs to the technical field of optical lens imaging, and particularly relates to a compact image space telecentric optical system.
Background
Along with the wide application of the space remote sensing technology in various fields, the requirement of people on the volume of the remote sensing system is gradually moving toward miniaturization and light weight so as to meet the requirements of different scenes including the field, and the volume of an optical module in the remote sensing system is also required to be compact. Besides compact structure, optical modules in remote sensing systems gradually develop to large fields of view, and when the angle of view is large, uneven illuminance on an image surface is extremely easy to generate, and the telecentric structure of the image space can enable the image surface to have excellent illuminance uniformity.
In addition, the space remote sensing system often works in environments with changeable climate, high and low temperature change, sand dust and the like, so that a lens suitable for the complex and changeable environments is urgently needed. At present, a compact lens capable of achieving a compact type is available on the market, but a compact type lens capable of simultaneously having an image space telecentric structure and adapting to a complex environment is not available. The invention provides an optical system of a compact lens, which can solve the problem of uneven image surface and adapt to complex environments. Therefore, it is necessary to develop and design a compact image-side telecentric optical system.
Disclosure of Invention
The invention aims to solve the technical problem of providing a compact image space telecentric optical system, which has clear and stable imaging, an image space telecentric structure, can solve the problem of uneven image surface, has a compact structure, and achieves the purposes of miniaturization and light weight.
To solve the above technical problems, the compact image side telecentric optical system of the present invention sequentially sets a protection window W1, a first lens L1 and a second lens L2 with negative diopter, a third lens L3 with positive diopter, a fourth lens L4 with negative diopter, a diaphragm O, a fifth lens L5 and a sixth lens L6 with positive diopter, a seventh lens L7 with negative diopter, an eighth lens L8 and a ninth lens L9 with positive diopter, a CCD window W2 and an image plane I1 along the light propagation direction; the first lens L1 is a negative meniscus lens protruding to the object space; the second lens L2 is a biconcave lens; the third lens L3 is a biconvex lens; the fourth lens L4 is a negative meniscus lens protruding to the object space; the fifth lens L5 is a positive meniscus lens convex toward the image side; a sixth lens L6 biconvex lens; the seventh lens L7 is a biconcave lens; the eighth lens L8 is a biconvex lens; the ninth lens L9 is a biconvex lens.
The surfaces of the lenses are spherical surfaces.
The curvature radius ranges of the front surface and the rear surface of the first lens L1 are 16.014 mm-22.680 mm and 7.981 mm-13.888 mm respectively, and the thickness range is 3 mm-4 mm; the radius of curvature of the front surface and the rear surface of the second lens L2 are respectively-29.169 mm to-12.704 mm and 13.326mm to 24.657mm, and the thickness range is 2mm to 2.5mm; the radius of curvature of the front surface and the rear surface of the third lens L3 are respectively 22.794 mm-39.707 mm and-42.228 mm to-19.251 mm, and the thickness range is 3.8 mm-4.2 mm; the radius of curvature of the front surface and the rear surface of the fourth lens L4 are respectively 7.641 mm-8.636 mm and 4.286 mm-6.086 mm, and the thickness range is 3.5 mm-5 mm; the radius of curvature of the front surface and the rear surface of the fifth lens L5 are respectively-18.307 mm to-11.676 mm and-8.876 mm to-6.748 mm, and the thickness range is 3mm to 4mm; the radius of curvature of the front surface and the rear surface of the sixth lens L6 are respectively 15.200 mm-26.074 mm and-10.223 mm to-8.846 mm, and the thickness range is 3.2 mm-4 mm; the radius of curvature of the front surface and the back surface of the seventh lens L7 are respectively-9.349 mm to-9.106 mm and 21.713mm to 73.259mm, and the thickness range is 2mm to 2.5mm; the radius of curvature of the front surface and the rear surface of the eighth lens L8 are respectively 36.461 mm-142.526 mm and-16.463 mm to-12.480 mm, and the thickness range is 3.6 mm-4 mm; the radius of curvature of the front and back surfaces of the ninth lens L9 ranges from 36.347mm to 103.077mm and from-45.221 mm to-24.617 mm, and the thickness ranges from 3.5mm to 4.5mm.
The air interval between the protective window W1 and the first lens L1 is 3mm; the air interval between the first lens L1 and the second lens L2 ranges from 4.41mm to 7.08mm; the air interval between the second lens L2 and the third lens L3 ranges from 1.42mm to 1.56mm; the air interval between the third lens L3 and the fourth lens L4 ranges from 0.4mm to 1.42mm; the air interval range between the fourth lens L4 and the diaphragm is 2.65 mm-5.43 mm; the air interval range between the diaphragm and the fifth lens L5 is 1.31 mm-1.34 mm; the air interval between the fifth lens L5 and the sixth lens L6 ranges from 0.4mm to 0.68mm; the air interval between the sixth lens L6 and the seventh lens L7 ranges from 0.75mm to 1.08mm; the air interval between the seventh lens L7 and the eighth lens L8 ranges from 0.98mm to 1.59mm; the air interval between the eighth lens L8 and the ninth lens L9 ranges from 0.75mm to 5.16mm; the air gap between the ninth lens L9 and the CCD window W2 is in the range of 10.07 mm-13.16 mm.
The first lens L1 to the ninth lens L9 are all made of glass materials.
The refractive index of the first lens L1 is 1.59, and the Abbe number is 68.3; the refractive index of the second lens L2 is 1.43, and the abbe number is 95; the refractive index of the third lens L3 ranges from 1.76 to 1.80, and the Abbe number ranges from 42.3 to 52.3; the refractive index of the fourth lens L4 ranges from 1.76 to 1.81, and the Abbe number ranges from 25.5 to 27.5; the refractive index of the fifth lens L5 ranges from 1.43 to 1.44, and the Abbe number ranges from 94.5 to 95; the refractive index of the sixth lens L6 ranges from 1.44 to 1.59, and the Abbe number ranges from 67.3 to 94.5; the refractive index of the seventh lens L7 is 1.76 and the abbe number is 27.5; the refractive index of the eighth lens L8 ranges from 1.43 to 1.44, and the Abbe number ranges from 94.5 to 95; the refractive index of the ninth lens L9 ranges from 1.81 to 1.85, and the abbe number ranges from 23.8 to 25.5.
Further, the invention also comprises a spacing ring arranged between the lenses, the spacing ring between the sixth lens and the seventh lens is made of indium steel, and the spacing ring between other adjacent lenses is made of aluminum alloy.
And the two sides of the protection window W1 are plated with three-proofing films.
The protection window W1 is K9 plane glass and has a thickness of 3mm.
The CCD window W2 is D263TECO planar glass, and the thickness is 0.7mm.
Based on the technical scheme, the invention has the following advantages:
the optical system provided by the invention is provided with the protection window W1, and the three-proofing film is plated on the two sides of the protection window W1, so that the whole system has the shock and vibration resistance, is dustproof, waterproof and mildew-proof, and is suitable for complex and changeable environments.
The athermalization lens can realize optical passive athermalization by selecting optical materials with different refractive index ranges and dispersion ranges and mechanical materials with proper thermal expansion coefficients, can clearly image at the temperature of-40 ℃ to 60 ℃, has simple and reliable structure and high assembly efficiency, and can be produced in a large scale.
The invention adopts an image space telecentric structure, the field angle reaches 47 degrees, and the image plane has excellent illumination uniformity while having a large field of view. On the other hand, the image space telecentric structure can prevent imaging blurring caused by image plane deviation under the vibration condition, and is beneficial to improving the reliability of the system.
The optical system provided by the invention has compact structure, the lens length is less than 70mm, the weight is less than 16g while realizing the athermalization of optics and the telecentric structure of an image space, the compactness of the optical system is realized, and meanwhile, the volume trend of the remote sensing system is favorable for realizing miniaturization and light weight so as to meet the requirements of different scenes including the field.
All lenses of the invention adopt single lenses, and compared with double-cemented lenses, the structure of the single lenses has higher stability and is not easy to deform. All glass materials are bright common materials, the materials are easy to obtain, all lenses are spherical, the processing and assembling technologies are mature, and the cost is low.
The optical system adopts the design technology of image space telecentric light path and optical athermalization, and reasonably matches surface parameters, glass materials, thickness, mechanical materials and the like, thereby realizing the purposes of compact structure, miniaturization and light weight, and simultaneously having the characteristics of high resolution, large view field, complex environmental adaptability, image space telecentric light path and the like.
Drawings
The invention is described in further detail below with reference to the drawings and the detailed description.
Fig. 1 is a schematic diagram of a compact image-side telecentric optical system according to the present invention.
Fig. 2 is an illuminance distribution diagram of an image plane of example 1.
FIGS. 3 (a), 3 (b) and 3 (c) are transfer diagrams of example 1 at a room temperature of 20℃and a low temperature of-50℃and a high temperature of +60℃, respectively.
Fig. 4 is an illuminance distribution diagram of an image plane of example 2.
FIGS. 5 (a), 5 (b) and 5 (c) are transfer diagrams of example 2 at a room temperature of 20℃and a low temperature of-50℃and a high temperature of +60℃, respectively.
Fig. 6 is an illuminance distribution diagram of an image plane of example 2.
FIGS. 7 (a), 7 (b) and 7 (c) are transfer diagrams of example 3 at room temperature of 20 ℃, low temperature of-50 ℃ and high temperature of +60 ℃, respectively.
Detailed Description
The present invention will now be described in further detail with reference to the drawings and examples, it being understood that the specific examples described herein are intended to illustrate the invention only and are not intended to be limiting. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements or interaction relationship between the two elements. The specific meaning of the above terms in the present invention can be understood in detail by those skilled in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below", "beneath" the second feature includes the first feature being "directly under" and obliquely below "the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, for convenience of description and simplicity of operation, and are not meant to indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
As shown in fig. 1, the compact image-side telecentric optical system of the present invention is provided with a protection window W1, a first lens L1 and a second lens L2 having negative diopters, a third lens L3 having positive diopters, a fourth lens L4 having negative diopters, a stop O, a fifth lens L5 and a sixth lens L6 having positive diopters, a seventh lens L7 having negative diopters, an eighth lens L8 and a ninth lens L9 having positive diopters, a CCD window W2, and an image plane I1. The first lens L1 is a negative meniscus lens protruding to the object space; the second lens L2 is a biconcave lens; the third lens L3 is a biconvex lens; the fourth lens L4 is a negative meniscus lens protruding to the object space; the fifth lens L5 is a positive meniscus lens convex toward the image side; a sixth lens L6 biconvex lens; the seventh lens L7 is a biconcave lens; the eighth lens L8 is a biconvex lens; the ninth lens L9 is a biconvex lens. The surfaces of the lenses are spherical surfaces.
In the embodiment of the invention, the protection window W1 mainly plays a role of a protection mirror for the whole system, the thickness is 3mm but not limited to 3mm, and K9 glass can be adopted as the material, and other transparent materials can also be adopted; the protection window W1 can be coated with three-proofing films on two sides, plays roles of dust prevention, water prevention and mildew prevention, and is suitable for complex and changeable environments.
In the embodiment of the invention, the CCD window W2 is D263TECO flat glass.
And space rings are arranged between the lenses, the space rings between the sixth lens and the seventh lens are made of indium steel, and the space rings between other adjacent lenses are made of aluminum alloy.
The optical system of the invention selects the optical materials with proper refractive index range and dispersion range and matches the mechanical materials with proper thermal expansion coefficient, and the mechanical materials selected by the invention comprise aluminum alloy and indium steel, and the thermal expansion coefficient of the indium steel is smaller, thus the athermalization can be well realized, and the system can image clearly with high quality in the temperature range of-40 ℃ to 60 ℃.
The optical system adopts an image space telecentric structure, and achieves the relative illumination of the image plane >93 percent by controlling the emergence angle of each view field to be smaller than 0.2 degrees, so that the image plane has excellent illumination uniformity while having a large view field.
The coverage wave band of the optical system is 400-650nm, and the optical system has better image quality under the high resolution condition of 200lp/mm by selecting proper surface type parameters, optical materials, air intervals and mechanical materials with proper thermal expansion coefficients for optimization.
Example 1
The parameters (radius, thickness, material, cone coefficient, etc.) of each optical element in this example 1 are shown in Table 1, where t i For the i-th optical element thickness, di is the spacing between the i-th optical element back surface and the next optical element front surface.
TABLE 1
The above example 1 can achieve the following criteria:
a) Focal length: 13.50mm;
b)F/#：2.8；
c) Wave band: 400-650 nm;
d) Angle of view: 42.1 ° X21.7 °,47.3 °;
e) MTF (normal temperature 20 ℃ C.). On-axis field of view >0.45@200mm/lp, full field of view >0.38@200mm/lp;
f) Relative illuminance: >94%;
g) And (3) adapting to the environmental temperature: -40-60 DEG C
h) Total optical length (front surface of protection window W1 to image plane): 69.16mm
Example 2
The parameters (radius, thickness, material, cone coefficient, etc.) of each optical element in this example 2 are shown in Table 2, where t i For the i-th optical element thickness, di is the spacing between the i-th optical element back surface and the next optical element front surface.
TABLE 2
The above example 2 can achieve the following criteria:
a) Focal length: 13.50mm;
b)F/#：2.8；
c) Wave band: 400-650 nm;
d) Angle of view: 42.1 ° X21.7 °,47.3 °;
e) MTF: on-axis field of view >0.4@200mm/lp, full field of view >0.22@200mm/lp;
f) Relative illuminance: >95%;
g) And (3) adapting to the environmental temperature: -40-60 DEG C
h) Total optical length (front surface of protection window W1 to image plane): 68.96mm
Example 3
The parameters (radius, thickness, material, cone coefficient, etc.) of each optical element in this example 3 are shown in Table 3
TABLE 3 Table 3
The above example 3 can achieve the following criteria:
a) Focal length: 13.50mm;
b)F/#：2.8；
c) Wave band: 400-650 nm;
d) Angle of view: 42.1 ° X21.7 °,47.3 °;
e) MTF: on-axis field of view >0.44@200mm/lp, full field of view >0.26@200mm/lp;
f) Relative illuminance: 93%;
g) And (3) adapting to the environmental temperature: -40-60 ℃;
h) Total optical length (front surface of protection window W1 to image plane): 68.58mm
As shown in fig. 2, fig. 4 and fig. 6, the relative illumination of all view fields of the compact image space telecentric athermalization system provided by the invention is greater than 93%, so that the uniformity of the illumination of the image plane can be better realized.
As shown in fig. 3 (a), 3 (b), 3 (c), 5 (a), 5 (b), 5 (c), 7 (a), 7 (b) and 7 (c), at normal temperature of 20 ℃, the central view field of the compact image telecentric athermalization system provided by the invention has a transfer function value of more than 0.4 at a frequency of 200lp/mm, the transfer function values of the central view field are all more than 0.38 at-40 ℃ and 60 ℃, the transfer function values of other view fields are all more than 0.2, and the compact image telecentric athermalization system is clear to image in a full view field and a full band range, and has a good athermalization effect.
The embodiments described herein represent only a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the present invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (9)
1. A compact image-side telecentric optical system characterized by being composed of a protection window (W1) with the same optical axis, a first lens (L1) and a second lens (L2) with negative diopter, a third lens (L3) with positive diopter, a fourth lens (L4) with negative diopter, a diaphragm (O), a fifth lens (L5) and a sixth lens (L6) with positive diopter, a seventh lens (L7) with negative diopter, an eighth lens (L8) and a ninth lens (L9) with positive diopter, a CCD window (W2) and an image plane (I1) which are sequentially arranged along the light propagation direction; the first lens (L1) is a negative meniscus lens protruding to the object space; the second lens (L2) is a biconcave lens; the third lens (L3) is a biconvex lens; the fourth lens (L4) is a negative meniscus lens protruding to the object space; the fifth lens (L5) is a positive meniscus lens protruding towards the image space; a sixth lens (L6) biconvex lens; the seventh lens (L7) is a biconcave lens; the eighth lens (L8) is a biconvex lens; the ninth lens (L9) is a biconvex lens; the radius of curvature of the front surface and the back surface of the first lens (L1) are 16.014 mm-22.680 mm and 7.981 mm-13.888 mm respectively, and the thickness range is 3 mm-4 mm; the radius of curvature of the front surface and the rear surface of the second lens (L2) are respectively-29.169 mm to-12.704 mm and 13.326mm to 24.657mm, and the thickness range is 2mm to 2.5mm; the radius of curvature of the front and back surfaces of the third lens (L3) are respectively 22.794 mm-39.707 mm and-42.228 mm-19.251 mm, and the thickness range is 3.8 mm-4.2 mm; the radius of curvature of the front surface and the rear surface of the fourth lens (L4) are respectively 7.641 mm-8.636 mm and 4.286 mm-6.086 mm, and the thickness range is 3.5 mm-5 mm; the radius of curvature of the front and back surfaces of the fifth lens (L5) are respectively-18.307 mm to-11.676 mm and-8.876 mm to-6.748 mm, and the thickness range is 3mm to 4mm; the radius of curvature of the front surface and the rear surface of the sixth lens (L6) are respectively 15.200 mm-26.074 mm and-10.223 mm-8.846 mm, and the thickness range is 3.2 mm-4 mm; the radius of curvature of the front surface and the back surface of the seventh lens (L7) are respectively-9.349 mm to-9.106 mm and 21.713mm to 73.259mm, and the thickness range is 2mm to 2.5mm; the radius of curvature of the front surface and the rear surface of the eighth lens (L8) are respectively 36.461 mm-142.526 mm and-16.463 mm-12.480 mm, and the thickness range is 3.6 mm-4 mm; the radius of curvature of the front and rear surfaces of the ninth lens (L9) ranges from 36.347mm to 103.077mm and from-45.221 mm to-24.617 mm, respectively, and the thickness ranges from 3.5mm to 4.5mm.
2. The compact, image-side telecentric optical system of claim 1, wherein each of said lens surfaces is spherical.
3. A compact image side telecentric optical system according to claim 1, characterized in that the air space between the protection window (W1) and the first lens (L1) is 3mm; the air interval between the first lens (L1) and the second lens (L2) is in the range of 4.41 mm-7.08 mm; the air interval between the second lens (L2) and the third lens (L3) ranges from 1.42mm to 1.56mm; the air interval between the third lens (L3) and the fourth lens (L4) ranges from 0.4mm to 1.42mm; the air interval range between the fourth lens (L4) and the diaphragm is 2.65 mm-5.43 mm; the air interval between the diaphragm and the fifth lens (L5) ranges from 1.31mm to 1.34mm; the air interval between the fifth lens (L5) and the sixth lens (L6) is in the range of 0.4 mm-0.68 mm; the air interval between the sixth lens (L6) and the seventh lens (L7) ranges from 0.75mm to 1.08mm; the air interval between the seventh lens (L7) and the eighth lens (L8) ranges from 0.98mm to 1.59mm; the air interval between the eighth lens (L8) and the ninth lens (L9) is in the range of 0.75 mm-5.16 mm; the air gap between the ninth lens (L9) and the CCD window (W2) is in the range of 10.07 mm-13.16 mm.
4. The compact image side telecentric optical system according to claim 1, characterized in that the first lens (L1) to the ninth lens (L9) are all made of glass material.
5. The compact image side telecentric optical system according to claim 4, characterized in that said first lens (L1) has a refractive index of 1.59 and an abbe number of 68.3; the refractive index of the second lens (L2) is 1.43 and the abbe number is 95; the refractive index of the third lens (L3) ranges from 1.76 to 1.80, and the Abbe number ranges from 42.3 to 52.3; the refractive index of the fourth lens (L4) ranges from 1.76 to 1.81, and the Abbe number ranges from 25.5 to 27.5; the refractive index of the fifth lens (L5) ranges from 1.43 to 1.44, and the Abbe number ranges from 94.5 to 95; the refractive index of the sixth lens (L6) ranges from 1.44 to 1.59, and the Abbe number ranges from 67.3 to 94.5; the refractive index of the seventh lens (L7) is 1.76, and the abbe number is 27.5; the refractive index of the eighth lens (L8) ranges from 1.43 to 1.44, and the Abbe number ranges from 94.5 to 95; the refractive index of the ninth lens (L9) is in the range of 1.81 to 1.85, and the Abbe number is in the range of 23.8 to 25.5.
6. The compact image side telecentric optical system of claim 5, further comprising a spacer disposed between each lens, the spacer between the sixth lens and the seventh lens being made of indium steel, the spacers between other adjacent lenses being made of aluminum alloy.
7. The compact image side telecentric optical system according to claim 1, characterized in that the protection window (W1) is double-sided coated with a tri-proof film.
8. The compact image side telecentric optical system according to claim 1, wherein the protection window (W1) is a K9 planar glass with a thickness of 3mm.
9. The compact image side telecentric optical system according to claim 1, wherein the CCD window (W2) is D263TECO planar glass with a thickness of 0.7mm.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI628462B (en) * | 2017-07-07 | 2018-07-01 | 上暘光學股份有限公司 | Telecentric lens system |
| KR20180123622A (en) * | 2017-05-09 | 2018-11-19 | 둥관 위퉁 옵티컬 테크놀로지 컴퍼니 리미티드 | Large aperture super wide angle and super high quality zoom lens |
| US10139595B1 (en) * | 2014-03-16 | 2018-11-27 | Navitar Industries, Llc | Optical assembly for a compact wide field of view digital camera with low first lens diameter to image diagonal ratio |
| CN110007438A (en) * | 2019-04-29 | 2019-07-12 | 佛山科学技术学院 | A kind of number aerial mapping color camera telecentric optical system |
| CN113885178A (en) * | 2021-10-26 | 2022-01-04 | 长春精仪光电技术有限公司 | Wide-spectrum image space telecentric athermal optical system |
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2022
- 2022-06-01 CN CN202210619973.8A patent/CN114942516B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10139595B1 (en) * | 2014-03-16 | 2018-11-27 | Navitar Industries, Llc | Optical assembly for a compact wide field of view digital camera with low first lens diameter to image diagonal ratio |
| KR20180123622A (en) * | 2017-05-09 | 2018-11-19 | 둥관 위퉁 옵티컬 테크놀로지 컴퍼니 리미티드 | Large aperture super wide angle and super high quality zoom lens |
| TWI628462B (en) * | 2017-07-07 | 2018-07-01 | 上暘光學股份有限公司 | Telecentric lens system |
| CN110007438A (en) * | 2019-04-29 | 2019-07-12 | 佛山科学技术学院 | A kind of number aerial mapping color camera telecentric optical system |
| CN113885178A (en) * | 2021-10-26 | 2022-01-04 | 长春精仪光电技术有限公司 | Wide-spectrum image space telecentric athermal optical system |
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| CN114942516A (en) | 2022-08-26 |
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