CN219320564U - Objective lens, imaging system and endoscope - Google Patents
Objective lens, imaging system and endoscope Download PDFInfo
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- CN219320564U CN219320564U CN202223610728.5U CN202223610728U CN219320564U CN 219320564 U CN219320564 U CN 219320564U CN 202223610728 U CN202223610728 U CN 202223610728U CN 219320564 U CN219320564 U CN 219320564U
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Abstract
The application discloses objective, imaging system and endoscope, objective include along the optical axis by the first lens that thing side set gradually to image side, second lens, diaphragm, third lens and fourth lens, each lens has negative focal power, positive focal power and negative focal power in proper order, adopts symmetrical focal power collocation, is favorable to optimizing off-axis aberration such as coma, astigmatism. The object side surface of the first lens isThe image side surface of the lens is a concave surface, the second lens is a biconvex lens, the third lens is a biconvex lens, and the fourth lens is a meniscus lens. The focal length of the first lens and the second lens satisfies 1.3 < |f 2 /f 1 And the focal length of the third lens and the fourth lens is smaller than 1.5 and smaller than 0.5 f 3 /f 4 And the optical power of each lens is distributed to be smaller than 0.8, so that the optical power of each lens and the height of converging light are balanced, good imaging quality is obtained, and the caliber is reduced.
Description
Technical Field
The present application relates to the field of optical systems, and in particular to an objective lens. The application also relates to an imaging system and an endoscope.
Background
In the medical field, endoscopes play an increasingly important role in diagnosis and treatment of diseases such as digestive tracts, bronchi, nasopharynx and the like, and in order to improve diagnosis efficiency and accuracy of diseases in body cavities by doctors and comfort level of patients in endoscopy, stricter requirements are also put on optical performance and size of the endoscopes in industry, and the endoscopes have a high image quality and miniaturization, so that future development trend of the endoscopes is seen.
Disclosure of Invention
In view of this, an object of the present application is to provide an objective lens, which is applied to an endoscope, can obtain good imaging quality, and can reduce the aperture. The application also provides an imaging system and an endoscope.
In order to achieve the above purpose, the present application provides the following technical solutions:
an objective lens is applied to an endoscope and comprises a first lens, a second lens, a diaphragm, a third lens and a fourth lens which are sequentially arranged from an object side to an image side along an optical axis, wherein the first lens is a plano-concave lens with negative focal power, the object side surface is a plane, the image side surface is a concave surface, the second lens is a biconvex lens with positive focal power, the third lens is a biconvex lens with positive focal power, and the fourth lens is a meniscus lens with negative focal power;
the objective lens also satisfies the following conditional expression: 1.3 < |f 2 /f 1 ∣＜1.5，0.5＜∣f 3 /f 4 ∣＜0.8；
Wherein f 1 Representation houseFocal length f of the first lens 2 Representing the focal length, f, of the second lens 3 Represents the focal length, f, of the third lens 4 Representing the focal length of the fourth lens.
Optionally, the first lens is a spherical lens, the second lens is an aspherical lens, the third lens is an aspherical lens, and the fourth lens is an aspherical lens.
Optionally, the object-side and image-side edges of the second, third and fourth lenses are free of curvature.
Optionally, the following conditional expression is also satisfied:
0.6mm＜d 2 < 1.1mm, and/or 0.3mm < d 4 ＜1mm；
Wherein d 2 Represents the thickness of the second lens on the optical axis, d 4 Representing the thickness of the fourth lens on the optical axis.
Optionally, the following conditional expression is also satisfied: d is 0.3mm < 1 < 0.5mm, and/or 0.4mm < d 3 < 0.7mm, where d 1 Represents the thickness of the first lens on the optical axis, d 3 Representing the thickness of the third lens on the optical axis.
Optionally, the following conditional expression is also satisfied: l is less than 0.3mm 1 < 0.6mm, wherein L 1 Representing the spacing of the first lens and the second lens.
Optionally, the following conditional expression is also satisfied: l is less than 0.1mm 2 < 0.2mm, wherein L 2 Representing the pitch of the third lens and the fourth lens.
Optionally, the maximum caliber of the objective lens is 2.5+/-0.01 mm, and the length is less than 5mm.
An imaging system for use with an endoscope, comprising:
an objective lens as described above;
and an imaging device disposed on an imaging surface of the objective lens.
An endoscope comprising an imaging system as described above.
As can be seen from the technical scheme, the present applicationThe provided objective lens applied to the endoscope comprises a first lens, a second lens, a diaphragm, a third lens and a fourth lens which are sequentially arranged from an object side to an image side along an optical axis, wherein each lens sequentially has negative focal power, positive focal power and negative focal power, and symmetrical focal power collocation is adopted, so that the lens is favorable for optimizing off-axis aberrations such as coma and astigmatism. The object side surface of the first lens is a plane, the image side surface of the first lens is a concave surface, the second lens is a biconvex lens, the third lens is a biconvex lens, and the fourth lens is a meniscus lens. The focal length of the first lens and the second lens satisfies 1.3 < |f 2 /f 1 And the focal length of the third lens and the fourth lens is smaller than 1.5 and smaller than 0.5 f 3 /f 4 And the focal power of each lens is distributed to be smaller than 0.8, so that the focal power of each lens and the height of converging light are balanced, the objective lens is facilitated to obtain good imaging quality, and the caliber of the objective lens is reduced. Therefore, the objective lens of the present application can reduce the aperture while obtaining good imaging quality, and can be applied to an endoscope.
The imaging system and the endoscope can achieve the beneficial effects.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, 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 an imaging system according to an embodiment of the present disclosure;
FIG. 2 is a schematic light path diagram of the imaging system shown in FIG. 1;
FIG. 3 is an MTF curve obtained by imaging simulation of the objective lens shown in FIG. 2;
FIG. 4 is a point column diagram obtained by imaging simulation of the objective lens shown in FIG. 2;
FIG. 5 is a schematic view of an optical path of an imaging system according to another embodiment of the present disclosure;
FIG. 6 is an MTF curve obtained by imaging simulation of the objective lens shown in FIG. 5;
fig. 7 is a dot column diagram obtained by imaging simulation of the objective lens shown in fig. 5.
Reference numerals in the drawings of the specification include:
10. 30-objective lens, 40-protective glass, 50-imaging device;
100. 300-diaphragm, 101, 301-first lens, 102, 302-second lens, 103, 303-third lens, 104, 304-fourth lens.
Detailed Description
In order to better understand the technical solutions in the present application, the following description will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
The embodiment provides an objective lens, which is applied to an endoscope and comprises a first lens, a second lens, a diaphragm, a third lens and a fourth lens which are sequentially arranged from an object side to an image side along an optical axis, wherein the first lens is a plano-concave lens with negative focal power, the object side surface is a plane, the image side surface is a concave surface, the second lens is a biconvex lens with positive focal power, the third lens is a biconvex lens with positive focal power, and the fourth lens is a meniscus lens with negative focal power;
the objective lens also satisfies the following conditional expression: 1.3 < |f 2 /f 1 ∣＜1.5，0.5＜∣f 3 /f 4 ∣＜0.8；
Wherein f 1 Representing the focal length, f, of the first lens 2 Representing the focal length, f, of the second lens 3 Represents the focal length, f, of the third lens 4 Representing the focal length of the fourth lens.
Each lens of the first lens to the fourth lens sequentially has negative focal power, positive focal power and negative focal power, and symmetrical focal power collocation is adopted, so that off-axis aberration such as coma, astigmatism and the like can be optimized.
Wherein the focal length f of the second lens 2 And focal length f of the first lens 1 Satisfying the condition 1.3 < |f 2 /f 1 I < 1.5 and focal length f of the third lens 3 And focal length f of fourth lens 4 Satisfying the condition 0.5 < |f 3 /f 4 And the focal power of each lens is distributed to be smaller than 0.8, so that the focal power of each lens and the height of converging light are balanced, the objective lens is facilitated to obtain good imaging quality, and the caliber of the objective lens is reduced. Specifically, if the focal length f of the second lens 2 And focal length f of the first lens 1 Ratio |f 2 /f 1 I is smaller than the lower limit value of the corresponding condition, or the focal length f of the third lens 3 And focal length f of fourth lens 4 Ratio |f 3 /f 4 When the angle is larger than the upper limit value of the corresponding condition, the incidence height and the incidence angle of the light on each lens of the objective lens can be increased, so that the caliber of the lens is increased and the tolerance of the system is sensitive; if the focal length f of the first lens 1 And focal length f of the second lens 2 Ratio |f 2 /f 1 When i is greater than the upper limit value of the corresponding condition, the focal power difference between the first lens and the second lens is larger, or the focal length f of the third lens 3 And focal length f of fourth lens 4 Ratio |f 3 /f 4 And when the value is smaller than the lower limit value of the corresponding condition, the optical power difference of the third lens and the fourth lens is larger, and the aberration correction is not facilitated. And the focal length of each lens meets the above conditional expression, and the focal power distribution of each lens is balanced, so that the light entering the objective lens has smooth trend, and the objective lens has good tolerance.
Therefore, the objective lens of the present embodiment can reduce the aperture while obtaining good imaging quality, and can be applied to an endoscope.
Preferably, in some embodiments, the first lens is a spherical lens, the second lens is an aspherical lens, the third lens is an aspherical lens, and the fourth lens is an aspherical lens. In the objective lens, the second lens to the fourth lens adopt aspheric lenses, and the aspheric coefficients of the lenses are reasonably optimized, so that the aberration can be well corrected, and the objective lens can obtain good imaging quality and reduce the caliber of the lenses; and by reasonably optimizing the aspherical coefficients of each lens, each surface of each lens well balances the three-level aberration contribution quantity, the objective lens has good imaging effect, and the tolerance of the whole system is loose.
Further, in order to obtain a smaller size of the present objective lens, the objective lens of the present embodiment also satisfies the following conditional expression: d is 0.3mm < 1 < 0.5mm, and/or 0.4mm < d 3 < 0.7mm; wherein d 1 Represents the thickness of the first lens on the optical axis, d 3 Representing the thickness of the third lens on the optical axis. When the thickness of the first lens and/or the thickness of the third lens satisfy the above-mentioned conditional expression, the objective lens can be shortened in size and the clamping assembly can be facilitated.
In addition, in order to facilitate the production of an aspherical lens by a molding method, the objective lens of the present embodiment also satisfies the following conditional expression: d is 0.6mm < 2 < 1.1mm, and/or 0.3mm < d 4 Less than 1mm; wherein d 2 Represents the thickness of the second lens on the optical axis, d 4 Representing the thickness of the fourth lens on the optical axis.
Further, in order to facilitate the assembly of the present objective lens, the objective lens of the present embodiment also satisfies the following conditional expression: l is less than 0.3mm 1 < 0.6mm, wherein L 1 Representing the spacing of the first and second lenses, such that configuring the first and second lenses not only facilitates the reduction in length of the objective lens, tending to miniaturize, but also facilitates placement of conventional spacers therebetween to ensure accuracy of the spacing, making the objective lens easy to assemble.
Further, the objective lens of the present embodiment also satisfies the following conditional expression: l is less than 0.1mm 2 < 0.2mm, wherein L 2 Representing the spacing of the third and fourth lenses, such that the arrangement of the third and fourth lenses not only facilitatesThe objective lens is reduced in length, tending to be miniaturized, while making the objective lens easy to assemble.
Further, in the objective lens of the present embodiment, if the second lens element to the fourth lens element are aspheric lenses, the object-side surface and the image-side surface of each of the second lens element, the third lens element and the fourth lens element are free from inflection, so that the required aspheric lenses can be easily processed by the mold pressing method, and the second lens element to the fourth lens element using the aspheric lenses have better workability and ease of assembly. Preferably, each lens may be formed from a glass lens, preferably a low melting glass material, which is easy to mold, and illustratively each lens may be formed from a glass material having a melting point of less than 700 ℃.
The optical power refers to the deflection of the parallel light passing through the optical system in the propagation direction of the light, and is used for representing the deflection power of the optical system to the incident parallel light beam. The optical system has a positive optical power, indicating that the deflection of the light is convergent; the optical system has a negative optical power, indicating that the deflection of the light is divergent. In this application, if the power or focal length of a lens does not define its zone location, then that lens' power or focal length may be that of the lens at the paraxial region.
For each lens arrangement in the lens, when the object side is from left to right to the image side, the object side of the lens is a convex surface, which means that any point on the object side surface of the lens is a tangential plane, the surface is always on the right of the tangential plane, the curvature radius of the surface is positive, and conversely, the object side is a concave surface, and the curvature radius of the surface is negative. The convex image side surface of the lens means that any point on the image side surface of the lens is a tangential plane, the surface is always on the left side of the tangential plane, the curvature radius is negative, and the concave image side surface is positive.
The present embodiment also provides an imaging system applied to an endoscope, including an objective lens and an imaging device, where the imaging device is disposed on an imaging surface of the objective lens, and the objective lens adopts the objective lens described in any one of the embodiments.
The present imaging system will be described in detail with reference to specific examples.
Example 1
Referring to fig. 1, fig. 1 is a schematic structural diagram of an imaging system according to an embodiment, and fig. 2 is a schematic optical path diagram of the imaging system shown in fig. 1. As shown in fig. 1 or 2, the imaging system of the present embodiment includes an objective lens 10, a cover glass 40, and an imaging device 50, the imaging device 50 being disposed on an imaging surface of the objective lens 10, the cover glass 40 covering a side of the imaging device 50 facing the objective lens 10 for protecting the imaging device 50 from damage.
The objective lens 10 includes a first lens 101, a second lens 102, a stop 100, a third lens 103 and a fourth lens 104, which are disposed in order from an object side to an image side along an optical axis Z, each lens having an object side facing the object side and an image side facing the image side. As shown in fig. 1, the first lens element 101 has negative refractive power, wherein an object-side surface S1 thereof is a plane, an image-side surface S2 thereof is a concave surface, the second lens element 102 has positive refractive power, an object-side surface S3 thereof is a convex surface, an image-side surface S4 thereof is a convex surface, the third lens element 103 has positive refractive power, an object-side surface S6 thereof is a convex surface, an image-side surface S7 thereof is a convex surface, the fourth lens element 104 has negative refractive power, an object-side surface S8 thereof is a concave surface, and an image-side surface S9 thereof is a convex surface. The maximum aperture of the objective lens is 2.5+/-0.01 mm, the length is less than 5mm, and the imaging surface of the objective lens 10 is matched with the light incidence angle (CRA) of the imaging device 50.
The specifications of the present embodiment are as follows:
angle of view: 150 °, effective F number: 8.8, focal length: 1.00mm, image height: 1.05mm.
In this embodiment, basic data of the objective lens 10 is shown in table 1, in which S0 represents an object plane, S5 represents a surface of the diaphragm 100, S10 represents an object plane of the cover glass 40, S11 represents an image plane of the cover glass 40, and S12 represents an imaging plane. The unit of curvature radius and distance is millimeter. The cone coefficient k and the higher order coefficients A4, A6, A8 satisfied by the aspherical surface profile of each lens are shown in table 2. The curve equation for an aspherical surface is expressed as follows:
wherein Z represents that the aspherical surface is high in the optical axis directionWhen the degree y is located, the distance from the aspheric vertex is sagittal, c represents the radius of curvature of the aspheric vertex, k represents the conic coefficient, A 4 ～A 12 Respectively represent the aspheric coefficients corresponding to the four to twelve orders.
TABLE 1
TABLE 2
| S3 | S4 | S6 | S7 | S8 | S9 | |
| k | 0.4 | -45 | -45 | -0.8 | -0.3 | 0.6 |
| A4 | 0.068 | -0.050 | 5.946 | -0.447 | -1.020 | -0.136 |
| A6 | 0.018 | -0.406 | -80.569 | 4.690 | 0.205 | -0.420 |
| A8 | -0.357 | 0.490 | 432.916 | 17.207 | -5.004 | 0.345 |
By performing imaging simulation based on the objective lens 10, an MTF curve as shown in fig. 3 and a point chart as shown in fig. 4 can be obtained. As can be seen from fig. 3 to 4, the objective lens 10 provided in this embodiment can obtain good imaging quality at an object distance of 10mm, and the imaging quality is close to the diffraction limit.
Example 2
Referring to fig. 5, fig. 5 is a schematic view illustrating an optical path of an imaging system according to still another embodiment, and as shown in fig. 5, the imaging system of the present embodiment includes an objective lens 30, a cover glass 40, and an imaging device 50. The objective lens 30 includes a first lens 301, a second lens 302, a stop 300, a third lens 303 and a fourth lens 304 sequentially disposed from an object side to an image side along an optical axis, each lens having an object side facing the object side and an image side facing the image side.
The specifications of the present embodiment are as follows:
angle of view: 150 °, effective F number: 8.4, focal length: 1.00mm, image height: 1.05mm.
In this embodiment, basic data of the objective lens 30 is shown in table 3, in which S0 represents an object plane, S5 represents a surface of the diaphragm 300, S10 represents an object plane of the cover glass 40, S11 represents an image plane of the cover glass 40, and S12 represents an imaging plane. The unit of curvature radius and distance is millimeter. The cone coefficient k and the higher order coefficients A4, A6, A8 satisfied by the aspherical surface profile of each lens are shown in table 4. The curve equation for the aspherical surface can be referred to as the equation described in example 1.
TABLE 3 Table 3
TABLE 4 Table 4
| S3 | S4 | S6 | S7 | S8 | S9 | |
| k | 3.410 | -0.700 | -45.000 | 1.000 | -0.500 | 13.000 |
| A4 | -0.100 | -0.006 | 2.800 | 0.400 | -0.680 | -0.050 |
| A6 | 0.004 | -0.238 | -5.000 | 10.000 | 3.200 | 0.800 |
| A8 | -0.633 | 0.123 | 10.000 | 22.000 | -16.000 | 0.500 |
By performing imaging simulation based on the objective lens 30, an MTF curve as shown in fig. 6 and a point chart as shown in fig. 7 can be obtained. As can be seen from fig. 6 to 7, the objective lens 30 provided in this embodiment can obtain good imaging quality at an object distance of 10mm, and the imaging quality is close to the diffraction limit.
The present embodiment also provides an endoscope including the imaging system described in the above embodiment. The detailed technical features and technical effects of the imaging system are described in the related parts, and are not repeated here. In addition, reference may be made to conventional solutions in the art for other structural features in the endoscope, which are not further elaborated here.
The above describes in detail an objective lens, an imaging system and an endoscope provided by the present application. Specific examples are set forth herein to illustrate the principles and embodiments of the present application, and the description of the examples above is only intended to assist in understanding the methods of the present application and their core ideas. It should be noted that it would be obvious to those skilled in the art that various improvements and modifications can be made to the present application without departing from the principles of the present application, and such improvements and modifications fall within the scope of the claims of the present application.
Claims (10)
1. An objective lens is applied to an endoscope, and is characterized by comprising a first lens, a second lens, a diaphragm, a third lens and a fourth lens which are sequentially arranged from an object side to an image side along an optical axis, wherein the first lens is a plano-concave lens with negative focal power, the object side surface is a plane, the image side surface is a concave surface, the second lens is a biconvex lens with positive focal power, the third lens is a biconvex lens with positive focal power, and the fourth lens is a meniscus lens with negative focal power;
the objective lens also satisfies the following conditional expression: 1.3 < |f 2 /f 1 ∣＜1.5，0.5＜∣f 3 /f 4 ∣＜0.8；
Wherein f 1 Representing the focal length, f, of the first lens 2 Representing the focus of the second lensDistance f 3 Represents the focal length, f, of the third lens 4 Representing the focal length of the fourth lens.
2. The objective lens of claim 1, wherein the first lens is a spherical lens, the second lens is an aspherical lens, the third lens is an aspherical lens, and the fourth lens is an aspherical lens.
3. The objective lens of claim 2, wherein the object side and image side edges of the second lens, the third lens and the fourth lens are free of curvature.
4. Objective according to claim 2, characterized in that the following conditional expression is also satisfied:
0.6mm＜d 2 < 1.1mm, and/or 0.3mm < d 4 ＜1mm；
Wherein d 2 Represents the thickness of the second lens on the optical axis, d 4 Representing the thickness of the fourth lens on the optical axis.
5. Objective according to any one of claims 1 to 4, characterized in that the following conditional expression is also satisfied: d is 0.3mm < 1 < 0.5mm, and/or 0.4mm < d 3 < 0.7mm, where d 1 Represents the thickness of the first lens on the optical axis, d 3 Representing the thickness of the third lens on the optical axis.
6. Objective lens according to claim 5, characterized in that the following conditional expression is also satisfied: l is less than 0.3mm 1 < 0.6mm, wherein L 1 Representing the spacing of the first lens and the second lens.
7. Objective lens according to claim 5, characterized in that the following conditional expression is also satisfied: l is less than 0.1mm 2 < 0.2mm, wherein L 2 Representing the pitch of the third lens and the fourth lens.
8. Objective according to claim 5, characterized in that the objective has a maximum caliber of 2.5±0.01mm and a length of less than 5mm.
9. An imaging system for use with an endoscope, comprising:
an objective lens according to any one of claims 1 to 8;
and an imaging device disposed on an imaging surface of the objective lens.
10. An endoscope comprising the imaging system of claim 9.
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| CN202223610728.5U CN219320564U (en) | 2022-12-30 | 2022-12-30 | Objective lens, imaging system and endoscope |
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| CN202223610728.5U CN219320564U (en) | 2022-12-30 | 2022-12-30 | Objective lens, imaging system and endoscope |
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