KR20100000757A - Triplet objective lens - Google Patents

Triplet objective lens Download PDF

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Publication number
KR20100000757A
KR20100000757A KR1020080060377A KR20080060377A KR20100000757A KR 20100000757 A KR20100000757 A KR 20100000757A KR 1020080060377 A KR1020080060377 A KR 1020080060377A KR 20080060377 A KR20080060377 A KR 20080060377A KR 20100000757 A KR20100000757 A KR 20100000757A
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KR
South Korea
Prior art keywords
lens
convex lens
convex
surface facing
objective lens
Prior art date
Application number
KR1020080060377A
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Korean (ko)
Inventor
슈쉬킨 이하
Original Assignee
삼성전기주식회사
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Publication date
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Priority to KR1020080060377A priority Critical patent/KR20100000757A/en
Publication of KR20100000757A publication Critical patent/KR20100000757A/en

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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
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G02B1/041—Lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/12—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only
    • G02B9/14—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only arranged + - +
    • G02B9/16—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only arranged + - + all the components being simple
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B9/00—Exposure-making shutters; Diaphragms
    • G03B9/02—Diaphragms

Abstract

PURPOSE: A triple objective lens is provided to obtain a high optical property by correcting optical aberration, distortion aberration, and hardness aberration according to a wide view angle. CONSTITUTION: A first convex lens(1) has a positive refractive power, and includes an aspherical surface. A meniscus lens(2) has a negative refractive power. A second convex lens(3) has a positive refractive power, and includes an aspherical surface. The first convex lens, the meniscus lens, and the second convex lens are successively arranged from an object to a top surface side according to the same optical axis. An aperture(S) is positioned in front of the object of the first convex lens, and controls quantity of incident light.

Description

Triple objective lens

The present invention relates to a triple objective lens.

In particular, the present invention relates to a triple objective lens having a high number of apertures to obtain a bright image with high resolution, and having at least two or more aspherical surfaces and having good aberration correction.

Recently, the demand for objective lenses suitable for small cameras is increasing, and such objective lenses are also required to be low in manufacturing cost.

Triple objective lenses are suitable for this purpose because the number of lenses is minimal, and such triple objective lenses or improved objective lenses have been widely used in camera fields (digital cameras, video cameras, etc.). In addition, it has been used in other projectors, projector displays, viewfinders, screen devices and the like.

The triple objective can correct all first order aberrations, but the remaining astigmatism cannot be corrected, so the performance of the objective is limited by astigmatism.

Too much demand for the specification of a triple objective lens makes it difficult to manufacture the lens simply because the astigmatism will be excessive and the depth of focus will be very shallow and any manufacturing error will further reduce the shallow depth.

A disadvantage of the triple objective design is that spherical and astigmatism corrections are made because the concave lens element introduces only the exact amount of the aberration of the opposite component to eliminate the effects of the two convex lens elements. This means that excessively dislodged lenses must be properly positioned without tilt or dispersion or that the aberrations cannot be completely removed from each other.

There are many four types of lens elements that are superior to conventional triple objectives, and these types of lens elements are typically used to achieve higher performance than conventional triple objectives but are slightly more expensive in terms of price.

Further, since the aperture is located too close to the concave lens element with respect to the astigmatism to be corrected, the improvement of the conventional triple objective lens is limited even if an aspherical surface is used because the manufacturing sensitivity problem still exists.

Accordingly, an object of the present invention is to provide a triple objective lens that can be obtained to solve the above problems and to obtain a bright image with high resolution.

It is also an object of the present invention to provide a triple objective lens having at least two aspherical surfaces and having good aberration correction.

The present invention for achieving the above object, the first convex lens having a positive refractive power and including an aspherical surface; A meniscus lens having negative refractive power; And a second convex lens having positive refractive power and including an aspherical surface, wherein the first convex lens, the meniscus lens and the second convex lens are arranged in an order from an object side to an image surface side along the same optical axis. Is arranged and fixed.

In addition, the first convex lens of the present invention is characterized in that the surface facing the image surface is an aspherical surface.

In addition, the second convex lens of the present invention is characterized in that the surface facing the object side is an aspherical surface.

In addition, the present invention is characterized in that it further comprises an aperture stop which is located in front of the object side of the first convex lens and adjusts the amount of incident light.

In addition, the present invention is characterized in that it further comprises a light source aperture positioned behind the image surface of the second convex lens for adjusting the position of the incident light.

In addition, in the first convex lens of the present invention, the surface facing the object is convex and the surface facing the image is convex, and the meniscus lens has the surface facing the object side concave. The surface facing the upper surface is convex, and the second convex lens is characterized in that the surface facing the meniscus lens is convex and the surface facing the upper surface is convex.

The first convex lens, the meniscus lens, and the second convex lens of the present invention may be formed to have focal lengths satisfying the following conditions.

0.8 <f1 / f <1.4,

-1.4 <f2 / f <-0.4,

0.5 <f3 / f <0.8

Here, f is the total focal length of the objective lens, f1 is the focal length of the first convex lens, f2 is the focal length of the meniscus lens, f3 is the focal length of the second convex lens.

The first convex lens, the meniscus lens and the second convex lens of the present invention may be formed to have refractive indices satisfying the following conditions.

1.85 <N1,

2.00 <N2,

1.85 <N3

Where N1 is the refractive index of the first convex lens, N2 is the refractive index of the meniscus lens, and N3 is the refractive index of the second convex lens.

According to the present invention as described above, having a high number of apertures has the effect of obtaining a high resolution image.

In addition, according to the present invention, having a high number of apertures has the effect of obtaining a bright image even in the dark.

In addition, according to the present invention, since it has at least two or more aspherical surfaces, the aberration correction is improved.

Hereinafter, the triple objective lens of the present invention will be described in detail with reference to the drawings below.

1 is a cross-sectional view of a triple objective lens according to an embodiment of the present invention.

Referring to FIG. 1, a triple objective lens according to an exemplary embodiment of the present invention may include a first convex lens 1 having positive refractive power, a meniscus lens 2 having a negative refractive power, and a positive refractive power from an object side. And a second convex lens (3) having, and these lenses (1, 2, 3) are arranged at regular intervals along the optical axis.

The aperture stop S is located in front of the object side of such a triple objective lens to adjust the amount of light of incident light incident from the object side and to adjust the depth of focus.

Then, the light source diaphragm F is positioned on the image surface IP side of the objective lens to determine the position where the incident light is focused on the image surface.

Here, the first convex lens 1 is provided between the object and the meniscus lens 2, is formed to have a positive refractive power, the surface facing the object is formed convex, and the upper surface (IP) The facing face is also convex.

This first convex lens 1 is designed to have an aspherical surface in order to facilitate aberration correction, and is preferably designed such that the surface facing the upper surface has an aspherical surface.

As such, when the first convex lens 1 is designed to have an aspherical surface, spherical aberration is particularly corrected, and accordingly, the first convex lens 1 can be designed to have a high number of apertures, so that a high resolution image can be obtained and a bright image can be obtained even in the dark.

The first convex lens 1 can be manufactured using plastic, and can be manufactured using glass or the like at low cost.

The meniscus lens 2 is provided between the first convex lens 1 and the second convex lens 3, is formed to have negative refractive power, and faces the first convex lens 1. This concave and the other side is formed convexly.

In addition, the meniscus lens 2 can be manufactured using plastic, and can be manufactured using glass etc. at low cost.

The second convex lens 3 is provided between the meniscus lens 2 and the image surface IP, is formed to have a positive refractive power, and the surface facing the object side is convex and the shave facing the image surface.

This second convex lens 3 is designed to have an aspherical surface to facilitate aberration correction, and is preferably designed such that the surface facing the object side has an aspherical surface.

In addition, the second convex lens 3 can be manufactured using plastic, and can be manufactured using glass or the like at low cost.

As such, when the objective lens is designed to have at least two aspherical surfaces, the aberration may be further improved.

In particular, when the aspherical surface is used in the objective lens as described above, the spherical aberration can be corrected, and as a result, it is possible to design a lens having a high aperture number.

Of course, the surface facing the image surface of the first convex lens 1 and the surface facing the object side of the second convex lens 3 are designed to have an aspherical surface, but the present invention is not limited thereto.

In addition, the approach distance d3 of the first convex lens 1 and the meniscus lens 2 is smaller than the approach distance of the meniscus lens 2 and the second convex lens 3, and thus a high focus. Depth can be obtained.

On the other hand, the first convex lens 1 of the objective lens of the present invention preferably satisfies the following conditional expression (1).

0.8 <f1 / f <1.4 ------ (1)

Here, f1 is the focal length of the first convex lens 1, and f is the overall focal length.

If the positive refractive power of the first convex lens 1 becomes stronger than the upper limit in Condition Expression 1, the thickness of the first convex lens 1 can be made thin, which is advantageous in miniaturizing the objective lens. However, distortion aberration is largely generated, resulting in poor lens characteristics.

On the contrary, if the positive refractive power of the first convex lens 1 becomes weak below the lower limit in Condition Expression 1, the second convex lens 3 should bear the larger refractive power. As a result, aberration, especially spherical aberration, is largely generated in the second convex lens 3, resulting in poor lens characteristics.

Next, the meniscus lens 2 of the objective lens of the present invention preferably satisfies the following conditional expression (2).

-1.4 <f2 / f <-0.4 ------ (2)

Here, f2 is the focal length of the meniscus lens 2, and f is the overall focal length.

When the negative refractive power of the meniscus lens 2 becomes weaker than the upper limit in the conditional expression 2, the positive refractive power of the first convex lens 1 becomes strong, which is advantageous in miniaturizing the objective lens. However, distortion aberration is largely generated, resulting in poor lens characteristics.

On the contrary, when the negative refractive power of the meniscus lens 2 becomes lower than the lower limit in the conditional expression 2, the positive refractive power of the first convex lens 1 is weakened, so that the second convex lens 3 is As a result of the greater refractive power, spherical aberration is largely generated in the second convex lens 3.

It is preferable that the second convex lens 3 of the objective lens of the present invention satisfies the following conditional expression (3).

0.5 <f3 / f <0.8 ------ (3)

When the refractive power of the second convex lens 3 becomes stronger than the upper limit of Conditional Expression 3, the objective lens can be miniaturized. However, aberrations, especially spherical aberration, occur largely.

When the refractive power of the second convex lens 3 becomes weaker than the lower limit of Conditional Expression 3, in order to miniaturize the objective lens, the refractive power of the first convex lens 1 must be made larger, and aberration, in particular coma aberration, is reduced. Occurs greatly.

Next, the objective lens of the present invention preferably satisfies the following conditional expression (4).

1.85 <N1

2.00 <N2

1.85 <N3 ------ (4)

Here, N1-N3 are refractive index of each lens (1st convex lens 1, meniscus lens 2, and 2nd convex lens 3).

When the first convex lens 1, the meniscus lens 2, and the second convex lens 3 satisfy the conditional expression 4, the total refractive power arrangement and the lens material are optimized by the number of three lenses, and the miniaturization and the large angle of view It is possible to secure.

In particular, the widest angle of view can be obtained by making the first convex lens 1 on the object side have positive refractive power, which is advantageous for miniaturization. In addition, when the above conditions are satisfied, glass materials and the like may be used as the material of each lens, so that objective lenses may be manufactured at low cost.

(Example 1)

In the first embodiment of the present invention, the focal length F of the entire triple objective lens is set to 25 mm, the angle-of view 2w is set to 20 °, and the numerical aperture F # is 0.8333. Is set.

Table 1 shows numerical data of the triple objective lens according to the first embodiment of the present invention, wherein r is a radius of curvature, d is a lens thickness or an interval between lenses, Nd is a refractive index of d-line, and vd is an Abbe. Indicates a number.

Here, the frequencies of incident light used are 486.13, 587.56, and 656.27 nm.

In the first embodiment, the first convex lens 1 has a positive curvature radius on the surface facing the object side and a negative curvature radius on the surface facing the image surface.

The meniscus lens 2 has a negative curvature radius on both the surface facing the object side and the surface facing the image surface.

In the second convex lens 3, the surface facing the object side has a positive curvature radius, and the surface facing the image surface has a negative curvature radius.

The thickness of the first convex lens 1 and the thickness of the third convex lens 3 are the same, and the refractive index and the Abbe's number are also the same. That is, the first convex lens 1 and the third convex lens 3 were manufactured using the same material.

In addition, the second convex lens 3 is positioned 13.4 mm in front of the image surface IP.

Table 1

Face number Radius of curvature (r) Thickness (d) Refractive index (Nd) Abbe number (vd) 2 20.88 9.5 1.5168 64.17 3 -43.68 7.9 4 -5.784 5.0 1.9525 20.36 5 -12.558 0.1 6 9.534 8.0 1.5168 64.17 7 -52.06 13.4

In these conditions, a graph of experimental results of the triple objective lens according to the first embodiment of the present invention is shown in FIGS. 2 to 6.

2 shows the coma aberration of the triple objective lens according to the first embodiment at different half angles of view, and FIG. 3 shows the wavelengths 486.1327 (nm) and 587.5618 (nm) of the triple objective lens according to the first embodiment. , Which shows an astigmatic field curvature for each of light having a value of 656.2725 (nm), FIG. 4 shows a% distortion of the triple objective lens according to the first embodiment, and FIG. 5 shows a triple according to the first embodiment. Spherical aberration is shown for each of the light having the wavelength of 486.1327 (nm), 587.5618 (nm), and 656.2725 (nm) of the objective lens.

FIG. 6 is a diagram showing an adjustment transfer function (MTF) of the triple objective lens according to the first embodiment.

As described above, the triple objective lens according to the first exemplary embodiment of the present invention can properly correct optical aberration, distortion aberration and hardness aberration according to a wide angle of view as shown in FIGS. 2 to 6 even in a wide wavelength range. High optical properties can be obtained.

(Example 2)

In the second embodiment of the present invention, the focal length F of the entire triple objective lens is set to 30 mm, the angle-of view 2w is set to 15.2 °, and the numerical aperture F # is 1.0. Is set.

Table 2 shows numerical data of the triple objective lens according to the second embodiment of the present invention, where r is the radius of curvature, d is the thickness of the lens or the distance between the lenses, Nd is the refractive index of the d-line, and vd is the Abbe. Indicates a number.

Here, the frequencies of incident light used are 486.13, 587.56, and 656.27 nm.

Similar to the first embodiment in the second embodiment, the first convex lens 1 has a positive radius of curvature on the surface facing the object side, a surface facing the upper surface has a negative radius of curvature, and Both the surface facing the object side and the image facing the image surface have a negative curvature radius, and the second convex lens 3 has the positive curvature radius on the surface facing the object side. The face opposite to the upper face has a negative curvature radius.

The thickness of the first convex lens 1 and the thickness of the third convex lens 3 are the same, and the refractive index and the Abbe's number are also the same. That is, the first convex lens 1 and the third convex lens 3 were manufactured using the same material.

However, in the second embodiment, unlike the first embodiment, the radius of curvature of the surface facing the object side and the image facing the image surface of the first convex lens 1 is relatively large, and thus the thickness is made thinner.

In addition, in the second embodiment, the curvature radius of the surface facing the object side and the image facing the object side of the meniscus lens 2 is designed to be relatively large, and the thickness is designed to be thicker.

In the second embodiment, unlike the first embodiment, the radius of curvature of the surface facing the object side of the second convex lens 3 is larger, and the radius of curvature of the surface facing the upper surface is made smaller and the thickness is the same. .

Table 2

Face number Radius of curvature (r) Thickness (d) Refractive index (Nd) Abbe number (vd) 2 24.288 9.4 1.5163 64.14 3 -29.257 7.4 4 -6.579 8.0 1.7552 27.58 5 -28.764 0.15 6 10.258 8.0 1.5163 64.14 7 -38.16 18.4

In these conditions, a graph of experimental results of the triple objective lens according to the second exemplary embodiment of the present invention is shown in FIGS. 7 to 11.

Here, FIG. 7 shows the coma aberration of the triple objective lens according to the second embodiment at different half angles of view, and FIG. 8 shows the wavelengths 486.1327 (nm) and 587.5618 (nm) of the triple objective lens according to the second embodiment. , Which shows an astigmatic field curvature for each of light having a value of 656.2725 (nm), FIG. 9 shows the% distortion of the triple objective lens according to the second embodiment, and FIG. 10 shows the triple according to the second embodiment. Spherical aberration is shown for each of the light having the wavelength of 486.1327 (nm), 587.5618 (nm), and 656.2725 (nm) of the objective lens.

FIG. 11 is a diagram illustrating an adjustment transfer function (MTF) of the triple objective lens according to the second embodiment.

As described above, the triple objective lens according to the second exemplary embodiment of the present invention can properly correct optical aberration, distortion aberration and hardness aberration according to a wide angle of view as shown in FIGS. 7 to 11 even in a wide wavelength range. High optical properties can be obtained.

1 is a cross-sectional view of a triple objective lens according to an embodiment of the present invention.

2 is a graph showing coma aberration of an objective lens according to a first exemplary embodiment of the present invention at different half angles of view;

3 is a graph showing an astigmatic field curvature for each of light having a wavelength of 486.1327 (nm), 587.5618 (nm), and 656.2725 (nm) of the triple objective lens according to the first embodiment of the present invention.

4 is a graph showing the% distortion of the triple objective lens according to the first embodiment of the present invention.

5 is a graph showing spherical aberration for each of light having a wavelength of 486.1327 (nm), 587.5618 (nm), and 656.2725 (nm) of the triple objective lens according to the first embodiment of the present invention.

6 is a graph showing a diffraction adjustment transfer function (MTF) of a triple objective lens according to the first embodiment of the present invention.

7 is a graph illustrating coma aberration of an objective lens according to a second exemplary embodiment of the present invention at different half angles of view;

8 is a graph showing an astigmatic field curvature for each of light having a wavelength of 486.1327 (nm), 587.5618 (nm), and 656.2725 (nm) of a triple objective lens according to a second exemplary embodiment of the present invention.

9 is a graph showing the% distortion of the triple objective lens according to the second embodiment of the present invention.

10 is a graph showing spherical aberration for each of light having a wavelength of 486.1327 (nm), 587.5618 (nm), and 656.2725 (nm) of the triple objective lens according to the second embodiment of the present invention.

FIG. 11 is a graph showing the adjusted transfer function (MTF) of the triple objective lens according to the second embodiment of the present invention. FIG.

<Explanation of symbols for the main parts of the drawings>

1: convex lens 2: meniscus lens

3: convex lens

Claims (8)

A first convex lens having positive refractive power and including an aspherical surface; A meniscus lens having negative refractive power; And And a second convex lens having positive refractive power and including an aspherical surface, wherein the first convex lens, the meniscus lens, and the second convex lens are arranged in an order from the object side to the image side along the same optical axis. Triple objective lens, characterized in that arranged and fixed. The method of claim 1, The first convex lens is a triple objective lens, characterized in that the surface facing the image surface aspherical. The method of claim 1, And the second convex lens is an aspherical surface facing the object side. The method of claim 1, And an aperture stop positioned in front of the object side of the first convex lens to adjust an amount of incident light. The method of claim 1, And a light source aperture positioned behind the upper surface of the second convex lens and adjusting a position of incident light. The method of claim 1, The first convex lens has a convex surface facing toward the object and a convex surface facing upward. The meniscus lens has a concave surface facing the object side and a convex surface facing the upper surface, And the second convex lens has a convex surface facing the meniscus lens and a convex surface facing the image lens. The method of claim 1, And the first convex lens, the meniscus lens, and the second convex lens each have a focal length that satisfies the following conditions. 0.8 <f1 / f <1.4, -1.4 <f2 / f <-0.4, 0.5 <f3 / f <0.8 Here, f is the total focal length of the triple objective lens, f1 is the focal length of the first convex lens, f2 is the focal length of the meniscus lens, f3 is the focal length of the second convex lens. The method of claim 1, And the first convex lens, the meniscus lens, and the second convex lens are formed to have refractive indices satisfying the following conditions, respectively. 1.85 <N1, 2.00 <N2, 1.85 <N3 N1 is a refractive index of the first convex lens, N2 is a refractive index of the meniscus lens, and N3 is a refractive index of the second convex lens.
KR1020080060377A 2008-06-25 2008-06-25 Triplet objective lens KR20100000757A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103018886A (en) * 2012-12-26 2013-04-03 苏州大学 Virtual image projection objective and ultrawide-angle objective
US10422976B2 (en) 2016-02-26 2019-09-24 Samsung Electronics Co., Ltd. Aberration corrected optical system for near-eye displays
WO2019208881A1 (en) * 2018-04-25 2019-10-31 Samsung Electronics Co., Ltd. Tiled triplet lenses providing a wide filed of view

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103018886A (en) * 2012-12-26 2013-04-03 苏州大学 Virtual image projection objective and ultrawide-angle objective
US10422976B2 (en) 2016-02-26 2019-09-24 Samsung Electronics Co., Ltd. Aberration corrected optical system for near-eye displays
WO2019208881A1 (en) * 2018-04-25 2019-10-31 Samsung Electronics Co., Ltd. Tiled triplet lenses providing a wide filed of view
US11454783B2 (en) 2018-04-25 2022-09-27 Samsung Electronics Co., Ltd. Tiled triplet lenses providing a wide field of view

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