CN103698875A - High-contrast high-acutance medical miniature near-infrared blood vessel visualization lens - Google Patents
High-contrast high-acutance medical miniature near-infrared blood vessel visualization lens Download PDFInfo
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- CN103698875A CN103698875A CN201410002419.0A CN201410002419A CN103698875A CN 103698875 A CN103698875 A CN 103698875A CN 201410002419 A CN201410002419 A CN 201410002419A CN 103698875 A CN103698875 A CN 103698875A
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Abstract
The invention relates to the technical field of thin optical lens assemblies in medical instruments, in particular to a high-contrast high-acutance medical miniature near-infrared blood vessel visualization lens, which comprises four optical lenses, a diaphragm and an infrared filter, wherein the four optical lenses are divided into three groups; the first group comprises two lenses and consists of a positive lens and a negative lens which are the first and second slices; the face type of the positive lens is convex on the front and convex on the back; the face type of the negative lens is convex on the front and concave on the back; the diaphragm is arranged between the positive lens and the negative lens; the second group is a positive lens which is concave on the front and convex on the back and is the third slice; the third group is a negative lens and is the fourth slice, the first face of the negative lens is a convex face, and the second face of the negative lens is a concave face; the four lenses are all aspherical; the infrared filter is arranged on one side of the third group of negative lens. On the premise of miniaturization, the contrast and the acutance of the lens can be improved to the maximum, edge parameters are limited, and the stability for processing and forming the lens is greatly improved.
Description
Technical field
The present invention relates to the technical field of the thin optical lens group in Medical Instruments, more specifically, relate to a kind of medical miniature near infrared blood vessel development camera lens of hard contrast high sharpness.
Background technology
In recent years, the application of optical lens is more and more, and its volume is more and more less, and meanwhile, imaging resolution is also more and more higher.In mobile product application, micro-lens is very universal, to meet ever-increasing user demand.Technique also has many patents, especially in the mobile products such as mobile phone, has obtained favor widely.
But most of micro-lens all carries out imaging in limit of visible spectrum, and be only used to coordinate the use of taking pictures.And be applied to medical context of detection, the particularly infrared lens of blood vessel development aspect, in order to obtain detecting accurately data, need to provide contrast and the acutance of certain mass.Yet general minisize photography camera lens lacks hard contrast and acutance.To the high request of imaging contrast and acutance, generally cause again volume bigger than normal, lens increase, and are unfavorable for the Integrated design of instrument integral body.
Meanwhile, spherical lens cannot bring desirable large field angle again under the prerequisite of small size, goes for large field angle, increases again lens numbers.Therefore generally adopt aspheric surface design, but lens difficulty in glass processing of aspheric surface design is quite large, adopts plastic material to need again to consider the deformation of the plastics paid special attention in press mold manufacturing technology.Because under the processing of micro lens, its Forming Quality and shape relation are close, and current most non-spherical lens fails to address this problem preferably.
Summary of the invention
The present invention is at least one defect overcoming described in above-mentioned prior art, a kind of medical miniature near infrared blood vessel development camera lens of hard contrast high sharpness is provided, improved to greatest extent contrast and the acutance of camera lens, and limited corner parameter, the stability of machine-shaping is increased greatly.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of medical miniature near infrared blood vessel development camera lens of hard contrast high sharpness, wherein, comprise four optical lenses, diaphragm, the infrared filter of a slice, four described optical lenses are divided into three groups, first group comprises two lens, by a positive lens and a negative lens, formed, lay respectively at first and second, the face type of positive lens is protruding after lordosis, the face type of negative lens is lordosis recurve, between positive lens and negative lens, is provided with diaphragm;
Second group is a front recessed rear protruding positive lens that is positioned at the 3rd;
The 3rd group is a negative lens, is positioned at the 4th, and its first surface is convex surface, and the second face is concave surface; Whole four lens are all aspheric surface type, and infrared filter is located at a side of the 3rd group of negative lens.
In this programme, whole four lens are all designed to aspheric surface type, make eyeglass thinner, gentlier, more flat, more can revise the phenomenons such as the visual field is narrow and small, imaging is unintelligible.Meanwhile, diaphragm, between first and second lens, can effectively reach the balance of camera lens volume and visual field.
The positive and negative lens combination of first group, has reduced spherical aberration effectively, and reduces camera lens total length, and diaphragm, between lens, has been controlled distortion well simultaneously, has effectively improved image quality.
Further, the 3rd described front recessed rear protruding positive lens is curved month type, and curvature meets formula: 0.35<C31/C32<0.45; C31 is the curvature of the 3rd positive lens first surface, and C32 is the curvature of second of the 3rd positive lens.By above-mentioned setting, with this, guarantee under aspheric design, effectively reduced the curvature of field and the coma that produce.
Further, the 4th described lordosis recurve negative lens is curved month type, and curvature meets formula: 0.15<C41/C42<0.2; C41 is the curvature of the 4th negative lens first surface, and C42 is the curvature of second of the 4th negative lens.By above-mentioned setting, with this, guarantee under aspheric design, astigmatism and distortion have counteracting in various degree.
With co-relation, can improve the performance of camera lens, as astigmatism, the curvature of field, distortion etc.
For the ease of processing and fabricating, and be difficult for producing deformation, guarantee Forming Quality, center thickness and the edge thickness of lens meet following formula:
D3/d3<2:1；
D4/d4<1.2:1；
Wherein, D3 is the center thickness of the 3rd positive lens, and d3 is the edge thickness of the 3rd positive lens.D4 is the center thickness of the 4th negative lens, and d4 is the edge thickness of the 4th negative lens.
The present invention also comprises infrared filter, after it is positioned at the 4th negative lens.
In of the present invention three groups of four lens, all surface all meets following equation:
Wherein, c is the slope on aspheric surface summit, and k is relevant with quadric eccentricity,
,
,
deng being that every expression aspheric surface of coefficient is with respect to the quadric distortion of benchmark.
Compared with prior art, beneficial effect is: the present invention is meeting under the prerequisite of microminiaturization, can improve to greatest extent contrast and the acutance of camera lens, and limit corner parameter, and the stability of machine-shaping is increased greatly.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the curvature of field of the present invention and distortion figure;
Fig. 3 is chromatic longitudiinal aberration figure of the present invention;
Fig. 4 is longitudinal aberration diagram of the present invention;
Fig. 5 is FFT MTF figure of the present invention (0-5lp/mm);
Fig. 6 is FFT MTF figure of the present invention (0-60lp/mm);
Fig. 7 is FFT MTF figure of the present invention (0-100lp/mm).
Embodiment
Accompanying drawing, only for exemplary illustration, can not be interpreted as the restriction to this patent; For better this exemplifying embodiment of explanation, some parts of accompanying drawing have omission, zoom in or out, and do not represent the size of actual product; To those skilled in the art, in accompanying drawing some known configurations and explanation thereof may to omit be understandable.In accompanying drawing, describe position relationship only for exemplary illustration, can not be interpreted as the restriction to this patent.
As shown in Figure 1, a kind of medical miniature near infrared blood vessel development camera lens of hard contrast high sharpness, wherein, comprises four optical lenses, diaphragm 6, the infrared filter 5 of a slice.Four optical lenses are divided into three groups, and first group comprises two lens, a positive lens 1 and a negative lens 2, consist of, lay respectively at first and second, the face type of positive lens 1 is protruding after lordosis, and the face type of negative lens 2 is lordosis recurve, between positive lens 1 and negative lens 2, is provided with diaphragm 6;
Second group is a front recessed rear protruding positive lens 3 that is positioned at the 3rd;
The 3rd group is a negative lens 4, is positioned at the 4th, and its first surface is convex surface, and the second face is concave surface; Whole four lens are all aspheric surface type, and infrared filter 5 is located at a side of the 3rd group of negative lens 4.
The present invention is by lens 1,2,3,4, and infrared filter 5 forms, and diaphragm is number in the figure 6.Positive lens 1 and negative lens 2 are first group.Herein, positive lens 1 and negative lens 2 are positive and negative lens combination, have effectively reduced spherical aberration, and reduce camera lens total length, and diaphragm 6 controlled distortion well, have effectively improved image quality.Lens 3 are positive lenss, its face type is platycelous bent moon design, curvature meets formula: 0.35<C31/C32<0.45, C31 is the curvature of the 3rd positive lens 3 first surfaces, C32 is the curvature of 3 second of the 3rd positive lenss, with this, guarantee under aspheric design, effectively reduce the curvature of field and the coma of generation.Negative lens 4, its first surface is convex surface, the second face is concave surface, its bent moon design, curvature meets following formula: 0.15<C41/C42<0.2, and C41 is the curvature of the 4th negative lens 4 first surfaces, and C42 is the curvature of 4 second of the 4th negative lenses, with this, guarantee under aspheric design, astigmatism and distortion have counteracting in various degree.
Whole four lens are all designed to aspheric surface type, make eyeglass thinner, gentlier, more flat, more can revise the phenomenons such as the visual field is narrow and small, imaging is unintelligible.Meanwhile, diaphragm 6, between positive lens 1 and negative lens 2, can effectively reach the balance of camera lens volume and visual field.
Center thickness and the edge thickness of the 3rd positive lens 3 meet formula: D3/d3<2:1; Wherein, D3 is the center thickness of the 3rd positive lens 3, and d3 is the edge thickness of the 3rd positive lens 3.Center thickness and the edge thickness of the 4th negative lens 4 meet formula: D4/d4<1.2:1; Wherein, D4 is the center thickness of the 4th negative lens 4, and d4 is the edge thickness of the 4th negative lens 4.
Selected near-infrared wavelength is 720nm, 760nm and 850nm.
Each lens position maintains static above.
The present invention is applied on the sensor devices of 1/4 inch.
With reference to the modulation transfer function image shown in accompanying drawing 5,6 and 7, as seen from the figure, 0-100lp/mm in a big way in, at low frequency section 0-5lp/mm, as accompanying drawing 5, almost reached 98%, visible contrast is fine.In the frequency range of 10-40lp/mm, main light can reach 75%, and obviously, acutance is very desirable.Under the frequency of 100lp/mm, most of curve can also reach 60% numerical value.
Instantiation is as shown in the table:
Table one
Table two
Obviously, above-mentioned exemplifying embodiment of the present invention is only used to example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all embodiments.All any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in the protection domain of the claims in the present invention.
Claims (5)
1. the medical miniature near infrared blood vessel development camera lens of a hard contrast high sharpness, it is characterized in that, comprise four optical lenses, a diaphragm (6), the infrared filter of a slice (5), four described optical lenses are divided into three groups, first group comprises two lens, by a positive lens (1) and a negative lens (2), formed, lay respectively at first and second, the face type of positive lens (1) is protruding after lordosis, the face type of negative lens (2) is lordosis recurve, between positive lens (1) and negative lens (2), is provided with diaphragm (6);
Second group is a front recessed rear protruding positive lens (3) that is positioned at the 3rd;
The 3rd group is a negative lens (4), is positioned at the 4th, and its first surface is convex surface, and the second face is concave surface; Whole four lens are all aspheric surface type, and infrared filter (5) is located at a side of the 3rd group of negative lens (4).
2. the medical miniature near infrared blood vessel development camera lens of a kind of hard contrast high sharpness according to claim 1, it is characterized in that: described the 3rd front recessed rear protruding positive lens (3) is curved month type, curvature meets formula: 0.35<C31/C32<0.45, C31 is the curvature of the 3rd positive lens (3) first surface, and C32 is the curvature of (3) second of the 3rd positive lenss.
3. the medical miniature near infrared blood vessel development camera lens of a kind of hard contrast high sharpness according to claim 1, is characterized in that: center thickness and the edge thickness of described the 3rd positive lens (3) meet formula: D3/d3<2:1; Wherein, D3 is the center thickness of the 3rd positive lens (3), and d3 is the edge thickness of the 3rd positive lens (3).
4. the medical miniature near infrared blood vessel development camera lens of a kind of hard contrast high sharpness according to claim 1, it is characterized in that: described the 4th lordosis recurve negative lens (4) is curved month type, and curvature meets formula: 0.15<C41/C42<0.2; C41 is the curvature of the 4th negative lens (4) first surface, and C42 is the curvature of (4) second of the 4th negative lenses.
5. the medical miniature near infrared blood vessel development camera lens of a kind of hard contrast high sharpness according to claim 1, is characterized in that: center thickness and the edge thickness of described the 4th negative lens (4) meet formula: D4/d4<1.2:1; D4 is the center thickness of the 4th negative lens (4), and d4 is the edge thickness of the 4th negative lens (4).
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| CN201410002419.0A CN103698875B (en) | 2014-01-03 | 2014-01-03 | A kind of medical miniature near infrared blood vessel development camera lens of hard contrast high sharpness |
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| CN201410002419.0A CN103698875B (en) | 2014-01-03 | 2014-01-03 | A kind of medical miniature near infrared blood vessel development camera lens of hard contrast high sharpness |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106597646A (en) * | 2015-10-14 | 2017-04-26 | 佳能株式会社 | Optical system and image pickup apparatus including the same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001051191A (en) * | 1999-08-10 | 2001-02-23 | Sumitomo Electric Ind Ltd | ftheta LENS |
| CN101114045A (en) * | 2006-07-25 | 2008-01-30 | 三星电机株式会社 | Subminiature optical system |
| US20120154905A1 (en) * | 2010-12-21 | 2012-06-21 | Fei-Hsin Tsai | Single focus wide-angle lens module |
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2014
- 2014-01-03 CN CN201410002419.0A patent/CN103698875B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001051191A (en) * | 1999-08-10 | 2001-02-23 | Sumitomo Electric Ind Ltd | ftheta LENS |
| CN101114045A (en) * | 2006-07-25 | 2008-01-30 | 三星电机株式会社 | Subminiature optical system |
| US20120154905A1 (en) * | 2010-12-21 | 2012-06-21 | Fei-Hsin Tsai | Single focus wide-angle lens module |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106597646A (en) * | 2015-10-14 | 2017-04-26 | 佳能株式会社 | Optical system and image pickup apparatus including the same |
| CN106597646B (en) * | 2015-10-14 | 2021-01-19 | 佳能株式会社 | Optical system and imaging apparatus including the same |
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| CN103698875B (en) | 2016-01-20 |
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