CN103698875B - A kind of medical miniature near infrared blood vessel development camera lens of hard contrast high sharpness - Google Patents

A kind of medical miniature near infrared blood vessel development camera lens of hard contrast high sharpness Download PDF

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Publication number
CN103698875B
CN103698875B CN201410002419.0A CN201410002419A CN103698875B CN 103698875 B CN103698875 B CN 103698875B CN 201410002419 A CN201410002419 A CN 201410002419A CN 103698875 B CN103698875 B CN 103698875B
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China
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lens
negative lens
negative
positive
positive lens
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CN201410002419.0A
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CN103698875A (en
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罗洁
蒋庆
贾祥志
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National Sun Yat-sen University
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National Sun Yat-sen University
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Abstract

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.Comprise four optical lenses, diaphragm, the infrared filter of a slice.Four optical lenses, are divided into three groups, and first group comprises two lens, be made up of a positive lens and a negative lens, lay respectively at first and second, the face type of positive lens is convex after lordosis, the face type of negative lens is lordosis recurve, is provided with diaphragm between positive lens and negative lens; Second group is a front recessed rear convex positive lens being positioned at the 3rd; 3rd group is a negative lens, and be positioned at the 4th, its first surface is convex surface, and the second face is concave surface; Whole four lens are all aspherical types, and infrared filter is located at the side of the 3rd group of negative lens.The present invention, under the prerequisite meeting microminiaturization, can improve contrast and the acutance of camera lens to greatest extent, and limit corner parameter, and the stability of machine-shaping is increased greatly.

Description

A kind of medical miniature near infrared blood vessel development camera lens of hard contrast high sharpness
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 gets 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 obtains in the mobile products such as mobile phone and favors widely.
But most of micro-lens all carries out imaging in limit of visible spectrum, and be only used to cooperation and take pictures use.And be applied to medical context of detection, the particularly infrared lens of blood vessel development aspect, in order to be detected data accurately, need contrast and acutance that certain mass is provided.But general minisize photography camera lens lacks hard contrast and acutance.Generally cause again volume bigger than normal to the high request of imaging contrast and acutance, lens increase, and are unfavorable for the Integrated design of instrument entirety.
Meanwhile, spherical lens cannot bring desirable Large visual angle angle again under the prerequisite of small size, goes for Large visual angle angle, increases lens numbers again.Therefore generally adopt aspheric design, but the lens of aspheric design difficulty in glass processing 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, fail to address this problem preferably.
Summary of the invention
The present invention is for overcoming at least one defect 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, improve contrast and the acutance of camera lens to greatest extent, and limit 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, be made up of a positive lens and a negative lens, lay respectively at first and second, the face type of positive lens is convex after lordosis, the face type of negative lens is lordosis recurve, is provided with diaphragm between positive lens and negative lens;
Second group is a front recessed rear convex positive lens being positioned at the 3rd;
3rd group is a negative lens, and be positioned at the 4th, its first surface is convex surface, and the second face is concave surface; Whole four lens are all aspherical types, and infrared filter is located at the side of the 3rd group of negative lens.
In this programme, whole four lens are all designed to aspherical types, 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, effectively can reach the balance of lens body sum visual field.
The positive and negative lens combination of first group, effectively reduces spherical aberration, and reduces camera lens total length, and diaphragm is between lens simultaneously, controls distortion well, effectively improves image quality.
Further, described the 3rd front recessed rear convex 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 the 3rd positive lens second.By above-mentioned setting, ensure under aspheric design with this, significantly reduce the curvature of field and the coma of generation.
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 the 4th negative lens second.By above-mentioned setting, ensure under aspheric design with this, astigmatism and the counteracting had in various degree that distorts.
The performance of camera lens can be improved with co-relation, as astigmatism, the curvature of field, distortion etc.
For the ease of processing and fabricating, and not easily produce deformation, ensure 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 equalities:
Wherein, c is the slope on aspheric surface summit, and k is relevant with quadric eccentricity, , , deng the every expression aspheric surface for coefficient relative to the quadric distortion of benchmark.
Compared with prior art, beneficial effect is: the present invention, under the prerequisite meeting microminiaturization, can improve contrast and the acutance of camera lens to greatest extent, 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 that FFTMTF of the present invention schemes (0-5lp/mm);
Fig. 6 is that FFTMTF of the present invention schemes (0-60lp/mm);
Fig. 7 is that FFTMTF of the present invention schemes (0-100lp/mm).
Embodiment
Accompanying drawing, only for exemplary illustration, can not be interpreted as the restriction to this patent; In order to better this exemplifying embodiment is described, 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 features and explanation thereof may be omitted is understandable.Describe position relationship in accompanying drawing only for exemplary illustration, the restriction to this patent can not be interpreted as.
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, are made up of a positive lens 1 and a negative lens 2, lay respectively at first and second, the face type of positive lens 1 is convex after lordosis, and the face type of negative lens 2 is lordosis recurve, is provided with diaphragm 6 between positive lens 1 and negative lens 2;
Second group is a front recessed rear convex positive lens 3 being positioned at the 3rd;
3rd group is a negative lens 4, and be positioned at the 4th, its first surface is convex surface, and the second face is concave surface; Whole four lens are all aspherical types, and infrared filter 5 is located at the 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, effectively decrease spherical aberration, and reduce camera lens total length, and diaphragm 6 controls distortion well, effectively improves image quality.Lens 3 are positive lenss, its face type is the design of platycelous bent moon, curvature meets formula: 0.35<C31/C32<0.45, C31 is the curvature of the 3rd positive lens 3 first surface, C32 is the curvature of the 3rd positive lens 3 second, ensure under aspheric design with this, effectively reduce the curvature of field and the coma of generation.Negative lens 4, its first surface is convex surface, second face is concave surface, its bent moon designs, curvature meets following formula: 0.15<C41/C42<0.2, C41 are the curvature of the 4th negative lens 4 first surface, and C42 is the curvature of the 4th negative lens 4 second, ensure under aspheric design with this, astigmatism and the counteracting had in various degree that distorts.
Whole four lens are all designed to aspherical types, 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, effectively can reach the balance of lens body sum visual field.
Infrared filter 5 is positioned at finally, can the situation of active balance uneven luminance, and can eliminate the impact of part distortion.
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 accompanying drawing 5, the modulation transfer function image shown in 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 reach 98%, visible contrast is fine.In the frequency range of 10-40lp/mm, principal rays can reach 75%, and obviously, acutance is very desirable.Under the frequency of 100lp/mm, most of curve can also reach the numerical value of 60%.
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 the need to also giving all embodiments.All any amendments done within the spirit and principles in the present invention, equivalent to replace and improvement etc., within the protection domain that all should be included in the claims in the present invention.

Claims (4)

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, diaphragm (6), the infrared filter of a slice (5), four described optical lenses are divided into three groups, first group comprises two lens, be made up of a positive lens (1) and a negative lens (2), lay respectively at first and second, the face type of positive lens (1) is convex after lordosis, the face type of negative lens (2) is lordosis recurve, is provided with diaphragm (6) between positive lens (1) and negative lens (2);
Second group is a front recessed rear convex positive lens (3) being positioned at the 3rd;
3rd group is a negative lens (4), and be positioned at the 4th, its first surface is convex surface, and the second face is concave surface; Whole four lens are all aspherical types, and infrared filter (5) is located at the side of the 3rd group of negative lens (4);
Described the 3rd front recessed rear convex 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 the 3rd positive lens (3) second.
2. 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 the 3rd described 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).
3. 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: the 4th described 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 the 4th negative lens (4) second.
4. 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 the 4th described 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).
CN201410002419.0A 2014-01-03 2014-01-03 A kind of medical miniature near infrared blood vessel development camera lens of hard contrast high sharpness Expired - Fee Related CN103698875B (en)

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Publication number Priority date Publication date Assignee Title
JP6632311B2 (en) * 2015-10-14 2020-01-22 キヤノン株式会社 Optical system and imaging apparatus having the same

Citations (2)

* Cited by examiner, † Cited by third party
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

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8369031B2 (en) * 2010-12-21 2013-02-05 Newmax Technology Co., Ltd. Single focus wide-angle lens module

Patent Citations (2)

* Cited by examiner, † Cited by third party
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

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