CN112711120A - Large-target-surface large-aperture near-infrared lens - Google Patents
Large-target-surface large-aperture near-infrared lens Download PDFInfo
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- CN112711120A CN112711120A CN201911027297.XA CN201911027297A CN112711120A CN 112711120 A CN112711120 A CN 112711120A CN 201911027297 A CN201911027297 A CN 201911027297A CN 112711120 A CN112711120 A CN 112711120A
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- 239000011521 glass Substances 0.000 claims abstract description 24
- 230000003287 optical effect Effects 0.000 claims abstract description 13
- 230000005499 meniscus Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000003384 imaging method Methods 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 5
- 230000004075 alteration Effects 0.000 description 4
- 238000013473 artificial intelligence Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
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- 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
- G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
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- Optics & Photonics (AREA)
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Abstract
The invention provides a large-target-surface large-aperture near-infrared lens which comprises a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an image plane, wherein the first lens, the second lens, the diaphragm, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the image plane are sequentially arranged from an object space to an image space, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the image plane are all. The invention reasonably distributes focal power through the structure of 7 glass spherical lenses, solves the problems of large target surface, large aperture, more aspheric surfaces, high cost, larger total optical length TTL and the like, and realizes the advantages of large target surface (imaging circle 16 mm), large aperture (F # = 1.4), total optical length (TTL is less than or equal to 30 mm) and the like.
Description
Technical Field
The invention relates to the field of near-infrared lenses, in particular to a large-target-surface large-aperture near-infrared lens.
Background
With the continuous development of artificial intelligence, the demands of industries such as robots, intelligent security, unmanned driving, unmanned aerial vehicles and the like on cameras are more and more severe. Such applications require lenses to operate in the near infrared band, with center wavelengths of 850nm, 905nm and 940nm, as well as increased aperture, reduced distortion and reduced size; since the target surface of the receiving sensor directly affects the product performance, more and more manufacturers select sensors with large target surfaces for imaging. In the prior art, most lenses have a small imaging area or an insufficient aperture, and cannot meet the application of a large aperture and a large target surface. Therefore, according to the market demand, a near-infrared lens with an imaging target surface of 1 inch, an aperture value F # =1.4 and a wide band of 600-950nm working wavelength is designed and developed, and the all-glass spherical lens is used, so that the cost is controllable, and the mass production is easy.
Disclosure of Invention
The invention aims to provide a large-target-surface large-aperture near-infrared lens, which solves the technical difficulties and batch processing problems of small imaging surface area, large number of aspheric lenses, high cost and the like.
In order to achieve the purpose, the invention provides the following scheme:
the utility model provides a big target surface big light ring near-infrared camera lens, includes first lens, second lens, diaphragm, third lens, fourth lens, fifth lens, sixth lens, seventh lens and the image plane of arranging in proper order from the object space to the image space, first to seventh lens all be glass spherical lens, the diaphragm is on third lens is close to the object space surface.
Optionally, the first lens is a meniscus glass spherical lens with negative focal power, one surface of the first lens facing the object space is a convex surface, and one surface of the first lens facing the image space is a concave surface.
Optionally, the second lens is a plano-convex glass spherical lens with positive focal power, one surface of the second lens facing the object space is a convex surface, and one surface of the second lens facing the image space is a concave surface.
Optionally, the third lens is a biconcave glass spherical lens with negative focal power, one surface of the third lens facing the object space is a concave surface, and one surface of the third lens facing the image space is a concave surface.
Optionally, the fourth lens is a double-convex glass spherical lens with positive focal power, one surface of the fourth lens facing the object space is a convex surface, and one surface of the fourth lens facing the image space is a convex surface.
Optionally, the fifth lens is a concave-convex glass spherical lens with negative focal power, one surface of the fifth lens facing the object space is a concave surface, and one surface of the fifth lens facing the image space is a convex surface.
Optionally, the sixth lens is a plano-convex glass spherical lens with positive focal power, one surface of the sixth lens facing the object space is a plane, and one surface of the sixth lens facing the image space is a convex surface.
Optionally, the seventh lens is a concave-convex glass spherical lens with negative focal power, one surface of the seventh lens facing the object space is a concave surface, and one surface of the seventh lens facing the image space is a convex surface.
Optionally, the diaphragm is located on the object-side surface of the third lens.
Optionally, the maximum size of the image transmission surface is 16 mm.
Optionally, the length from the object space surface to the image plane of the first lens is 30 mm.
Optionally, the working waveband of the lens is 600-950 nm.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention provides a large-target-surface large-aperture near-infrared lens which comprises a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an image plane, wherein the first lens, the second lens, the diaphragm, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the image plane are sequentially arranged from an object space to an image space, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the image plane are all. The invention reasonably distributes focal power through the structure of 7 glass spherical lenses, solves the problems of large target surface, large aperture, more aspheric surfaces, high cost, larger total optical length TTL and the like, and realizes the advantages of large target surface (imaging circle 16 mm), large aperture (F # = 1.4), total optical length (TTL is less than or equal to 30 mm) and the like.
Drawings
FIG. 1 is a schematic diagram of the optical path of the present invention.
FIG. 2 is a dot-column diagram of the present invention under the near infrared light of 600-950 nm.
FIG. 3 is a graph of MTF under the near infrared light of 600-950nm according to the present invention.
FIG. 4 is a graph of field curvature and distortion at 600-950nm in the present invention.
FIG. 5 is a graph of relative illuminance at 600-950nm in the present invention.
FIG. 6 is a spherical aberration curve under the near infrared light of 600-950 nm.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a large-target-surface large-aperture near-infrared lens, which solves the technical difficulties of small imaging surface area, large number of aspheric lenses, high cost and the like and the problem of batch processing.
FIG. 1 is a schematic diagram of the optical path of the present invention. As shown in FIG. 1, the large-target-surface large-aperture near infrared lens comprises a first lens 1, a second lens 2, a diaphragm 3, a third lens 4, a fourth lens 5, a fifth lens 6, a sixth lens 7, a seventh lens 8 and an image plane 9 which are sequentially arranged from an object side to an image side, wherein the first lens 1, the third lens 4, the fifth lens 6 and the seventh lens 8 have negative focal power, the second lens 2, the fourth lens 5 and the sixth lens 7 have positive focal power, and the diaphragm 3 is arranged on the surface, close to the object side, of the third lens 4.
The lens works in a near-infrared band of 600-950nm, is mainly applied to non-visible light illumination environments such as unmanned driving, intelligent security and unmanned aerial vehicles, has a corresponding chip size of 1 inch, and has the characteristics of large aperture (F # = 1.4), low distortion (DIST < 4%), total optical length (TTL is less than or equal to 30 mm), and the like.
First lens 1 adopts the meniscus glass spherical lens of negative focal power, the one side of first lens 1 towards the object space is the convex surface, the one side of first lens 1 towards the image space is the concave surface.
The second lens 2 is a plano-convex glass spherical lens with positive focal power, one surface of the second lens 2 facing the object space is a convex surface, and one surface of the second lens 2 facing the image space is a concave surface.
The diaphragm 3 is located on the object-side surface of the third lens 4.
The third lens 4 adopts a double-concave glass spherical lens with negative focal power, one surface of the third lens 4 facing the object space is a concave surface, and one surface of the third lens 4 facing the image space is a concave surface.
The fourth lens 5 is a double-convex glass spherical lens with positive focal power, one surface of the fourth lens 5 facing the object space is a convex surface, and one surface of the fourth lens 5 facing the image space is a convex surface.
The fifth lens 6 is a concave-convex glass spherical lens with negative focal power, one surface of the fifth lens 6 facing the object space is a concave surface, and one surface of the fifth lens 6 facing the image space is a convex surface.
The sixth lens 7 is a plano-convex glass spherical lens with positive focal power, one surface of the sixth lens 7 facing the object space is a plane, and one surface of the sixth lens 7 facing the image space is a convex surface.
The seventh lens 8 is a concave-convex glass spherical lens with negative focal power, one surface of the seventh lens 8 facing the object space is a concave surface, and one surface of the seventh lens 8 facing the image space is a convex surface.
The maximum size of the image surface 9 is 16 mm.
The length from the object space surface of the first lens 1 to the image surface 9 is 30 mm.
Fig. 2 to 6 are optical performance diagrams of embodiments of the present invention, in which:
FIG. 2 is a dot-column diagram of the wavelength below the near-infrared band of 600-950nm, wherein the wavelengths are 600nm, 800nm and 950nm, and the weight is 1: 2: 1. as can be seen from fig. 2, the scattered spots under each field are relatively concentrated and uniformly distributed, and only the scattered spot at the maximum field is relatively large but within a tolerable range.
FIG. 3 is a graph of MTF at the near-infrared band of 600-950 nm. As can be seen from FIG. 3, the MTF value at 55lp/mm in the full field is not less than 0.45, and the imaging quality is good.
FIG. 4 is a graph of field curvature and distortion in the near infrared band of 600-950 nm. As can be seen from FIG. 4, the optical distortion is negative, with a maximum value of-3.6%; the maximum value of the field curvature is 0.15 mm.
FIG. 5 is a graph of relative illuminance under 600-950nm near-infrared light. As can be seen from fig. 5, the relative illuminance curve decreases smoothly, and the relative illuminance value at the maximum field of view is greater than 45%.
FIG. 6 is a graph of spherical aberration under the near infrared light of 600 and 950 nm. As can be seen from fig. 6, the spherical aberration of the lens is relatively small, and the aberration is well corrected.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to assist understanding of the system and its core concepts; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (12)
1. The large-target-surface large-aperture near-infrared lens comprises a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an image surface which are sequentially arranged from an object space to an image space.
2. The large-target-surface large-aperture near infrared lens according to claim 1, wherein the first lens is a negative meniscus spherical lens, the surface of the first lens facing the object side is convex, and the surface of the first lens facing the image side is concave.
3. The large-target-surface large-aperture near infrared lens according to claim 1, wherein the second lens is a plano-convex glass spherical lens with positive optical power, the surface of the second lens facing the object side is a convex surface, and the surface of the second lens facing the image side is a concave surface.
4. The large-target-surface large-aperture near infrared lens according to claim 1, wherein the third lens is a negative-power biconcave glass spherical lens, the surface of the third lens facing the object side is a concave surface, and the surface of the third lens facing the image side is a concave surface.
5. The large-target-surface large-aperture near infrared lens according to claim 1, wherein the fourth lens is a double-convex glass spherical lens with positive optical power, a surface of the fourth lens facing the object side is a convex surface, and a surface of the fourth lens facing the image side is a convex surface.
6. The large-target-surface large-aperture near infrared lens according to claim 1, wherein the fifth lens is a negative-power concave-convex glass spherical lens, a surface of the fifth lens facing the object side is a concave surface, and a surface of the fifth lens facing the image side is a convex surface.
7. The large-target-surface large-aperture near infrared lens according to claim 1, wherein the sixth lens is a plano-convex glass spherical lens with positive optical power, one surface of the sixth lens facing the object side is a plane, and one surface of the sixth lens facing the image side is a convex surface.
8. The large-target-surface large-aperture near infrared lens according to claim 1, wherein the seventh lens is a concave-convex glass spherical lens with negative optical power, a surface of the seventh lens facing the object side is a concave surface, and a surface of the seventh lens facing the image side is a convex surface.
9. The large-target-surface large-aperture near-infrared lens according to claim 1, wherein the diaphragm is located on the object-side surface of the third lens.
10. The large-target-surface large-aperture near-infrared lens according to claim 1, wherein the maximum size of the image transmission surface is 16 mm.
11. The large target area large aperture near-infrared lens of claim 1, wherein the first lens has a length from object-side surface to image-side surface of 30 mm.
12. The large-target-surface large-aperture near infrared lens according to claim 1, wherein the operating band of the lens is 600-950 nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911027297.XA CN112711120A (en) | 2019-10-27 | 2019-10-27 | Large-target-surface large-aperture near-infrared lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911027297.XA CN112711120A (en) | 2019-10-27 | 2019-10-27 | Large-target-surface large-aperture near-infrared lens |
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| CN112711120A true CN112711120A (en) | 2021-04-27 |
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| CN201911027297.XA Pending CN112711120A (en) | 2019-10-27 | 2019-10-27 | Large-target-surface large-aperture near-infrared lens |
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2019
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| JPH06324264A (en) * | 1993-05-13 | 1994-11-25 | Nikon Corp | Wide angle lens |
| TW200912421A (en) * | 2007-09-11 | 2009-03-16 | Young Optics Inc | Fixed-focus lens |
| US20100046094A1 (en) * | 2008-08-21 | 2010-02-25 | Taro Asami | Imaging lens and imaging apparatus |
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