USRE45592E1 - Photographing lens - Google Patents
Photographing lens Download PDFInfo
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- USRE45592E1 USRE45592E1 US14/487,817 US201414487817A USRE45592E US RE45592 E1 USRE45592 E1 US RE45592E1 US 201414487817 A US201414487817 A US 201414487817A US RE45592 E USRE45592 E US RE45592E
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- photographing lens
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- 230000014509 gene expression Effects 0.000 claims abstract description 51
- 230000003287 optical effect Effects 0.000 claims abstract description 17
- 230000004075 alteration Effects 0.000 description 18
- 239000013078 crystal Substances 0.000 description 3
- 206010010071 Coma Diseases 0.000 description 2
- 201000009310 astigmatism Diseases 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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- 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 -
- G02B9/34—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only
-
- 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
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/004—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having four lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/16—Optical objectives specially designed for the purposes specified below for use in conjunction with image converters or intensifiers, or for use with projectors, e.g. objectives for projection TV
-
- 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
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/22—Telecentric objectives or lens systems
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
- G02B15/173—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +-+
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
Definitions
- the present invention relates to a photographing lens. More specifically, the present invention relates to a miniature photographing lens for cameras using an image pickup device such as charge coupled device (CCD).
- CCD charge coupled device
- the optical system using a solid-state image pickup device employs a crystal filter so as to prevent moiré caused by the periodical structure of the image pickup device. Therefore, the thickness and location of the crystal filter must be taken into consideration in designing optical systems. In particular, the telecentricity of an incident ray to the image side to face an image forming plane is an important factor of the design.
- the photographing lens for cameras using a solid-state image pickup device must have good telecentricity and a long retrofocal length for the use of the crystal filter, as well as high resolution.
- the photographing lens is also required to have a low F-number for entrance of a larger amount of light so as to compensate for the deterioration of sensitivity caused by the high pixel value of the solid-state image pickup device, and its compactness is needed to realize miniaturization and weight savings.
- lens-designing technologies for adequately arranging the refractive powers of the component lenses of the photographing lens and precise technologies for realizing good performance are necessary.
- the conventional optical systems using a solid-state image pickup device are as follows:
- the optical systems disclosed in the cited patents 1) and 2) are retrofocus optical systems comprising, in order from the object side, a lens group having a negative refractive power, an iris diaphragm, and a second lens group having a positive refractive power.
- These conventional optical systems may easily secure a large amount of peripheral light and have good telecentricity, but the correction of aberration, particularly distortion, is difficult to achieve, and the overall length of the optical systems is increased.
- the present invention provides a compact photographing lens that has a high resolution with good telecentricity and a long retrofocal length as a photographing optical system of a camera using an image pickup device.
- One embodiment of the present invention is directed to a photographing lens comprising, in order from an object side: a first lens having a positive refractive power and a convex surface on the object side; a second lens having a negative refractive power; a third lens having a positive refractive power; and a fourth lens having a negative refractive power and at least one aspheric surface, the photographing lens satisfying the following conditional expressions:
- L T denotes the distance on the optical axis between the object side of the first lens and the image side of the fourth lens
- f denotes the total focal length of the photographing lens
- f 3 denotes the focal length of the third lens.
- the third lens has at least one aspheric surface.
- the photographing lens further satisfies the following conditional expressions:
- f 1 denotes the focal length of the first lens
- f 2 denotes the focal length of the second lens
- the photographing lens further satisfies the following conditional expressions:
- the photographing lens further satisfies the following conditional expressions:
- f 4 denotes the focal length of the fourth lens.
- FIG. 1 illustrates the configuration of a photographing lens according to a first embodiment of the present invention.
- FIG. 2 is a graph showing aberrations of the photographing lens according to the first embodiment of the present invention depicted in FIG. 1 .
- FIG. 3 illustrates the configuration of a photographing lens according to a second embodiment of the present invention.
- FIG. 4 is a graph showing the aberrations of the photographing lens according to the second embodiment of the present invention depicted in FIG. 3 .
- FIG. 5 illustrates the configuration of a photographing lens according to a third embodiment of the present invention.
- FIG. 6 is a graph showing the aberrations of the photographing lens according to the third embodiment of the present invention depicted in FIG. 5 .
- FIG. 7 illustrates the configuration of a photographing lens according to a fourth embodiment of the present invention.
- FIG. 8 is a graph showing the aberrations of the photographing lens according to the fourth embodiment of the present invention depicted in FIG. 7 .
- Embodiments of the present invention provide a photographing lens having high resolution and good telecentricity, and can be miniaturized as a photographing optical system of cameras using an image pickup device.
- FIGS. 1 , 3 , 5 , and 7 illustrate the configuration of the photographing lens according to an embodiment of the present invention.
- the photographing lens according to an embodiment of the present invention includes, in order from an object side, a first lens 1 having a positive refractive power, a second lens 2 having a negative refractive power, a third lens 3 having a positive refractive power, and a fourth lens 4 having a negative refractive power.
- the photographing lens has an iris diaphragm A located on the object side of the first lens 1 , and a filter 5 on the image side of the fourth lens 4 .
- the photographing lens according to an embodiment of the present invention basically has a second lens 2 having a negative refractive power after a first lens 1 having a positive refractive power, a third lens 3 having a positive refractive power after the second lens 2 , and a fourth lens 4 having a negative refractive power after the third lens 3 , so as to correct spherical aberration, coma, or chromatic aberration occurring near the optical axis by the first and second lenses 1 and 2 and to maintain telecentricity on the third lens 3 .
- the arrangement of the fourth lens 4 contributes to the correction of abaxial aberrations such as astigmatism and distortion.
- L T denotes the distance between the object side of the first lens 1 and the image side of the fourth lens 4
- f denotes the total focal length of the photographing lens.
- the conditional expression 1 defines the ratio of the length of the photographing lens to the total focal length so as to realize the compactness of the photographing lens.
- the ratio exceeds the upper limit of the conditional expression 1, the telecentricity may be better but the increased length makes it difficult to realize compactness of the photographing lens.
- n 3 denotes the refractive index of the third lens 3 ; and n 4 denotes the refractive index of the fourth lens 4 .
- the conditional expression 2 defines the difference of refractive index between the third and fourth lenses 3 and 4 .
- the ratio falls below the lower limit of the conditional expression 2
- the magnification chromatic aberration becomes large due to the increased difference of refractive index between the third and fourth lenses 3 and 4 .
- conditional expression 3 defines the ratio of the focal length of the first lens 1 to the total focal length of the photographing lens.
- the ratio exceeds the upper limit of the conditional expression 3
- the refractive power of the first lens 1 lowers to increase the chromatic aberration.
- the ratio falls below the lower limit of the conditional expression 3
- the refractive power of the first lens 1 becomes large and increases the spherical aberration and coma.
- conditional expression 4 defines the ratio of the focal length of the second lens 2 to the total focal length of the photographing lens.
- the ratio exceeds the upper limit of the conditional expression 4
- the refractive power of the second lens 2 increases and it becomes difficult to correct the spherical aberration.
- the ratio falls below the lower limit of the conditional expression 4
- the refractive power of the second lens 2 becomes lower and it becomes difficult to correct the chromatic aberration.
- conditional expression 5 defines the ratio of the focal length of the third lens 3 to the total focal length of the photographing lens.
- the ratio exceeds the upper limit of the conditional expression 5
- the refractive power of the third lens 3 lowers and it becomes difficult to maintain telecentricity.
- the ratio falls below the lower limit of the conditional expression 5
- the refractive power of the third lens 3 becomes stronger and increases the chromatic aberration and it becomes difficult to correct the astigmatism.
- conditional expression 6 defines the ratio of the focal length of the fourth lens 4 to the total focal length of the photographing lens.
- the ratio exceeds the upper limit of the conditional expression 6, the refractive power of the fourth lens 4 becomes stronger deteriorating the telecentricity, and it becomes difficult to correct distortion.
- the refractive power of the fourth lens 4 reduces to increase the total focal length of the photographing lens, and it becomes difficult to realize the compactness of the photographing lens.
- f is the focal length
- nd is the refractive index
- v is the Abbe's value.
- the unit of length is “mm (millimeter)”.
- the F-number Fno is 2.82
- the focal length f is 4.5 mm
- the angle of view (2 ⁇ ) is 60.60°.
- FIG. 1 illustrates the configuration of the photographing lens according to a first embodiment of the present invention.
- the photographing lens according to the first embodiment comprises, as shown in FIG. 1 , a first lens 1 having a positive refractive power and a convex surface facing to the object side, a second lens 2 having a negative refractive power and a concave surface on both sides, a third lens 3 having a positive refractive power and a convex surface on the image side, and a fourth lens 4 having a negative refractive power and at least one aspheric surface.
- the photographing lens has filter 5 arranged on the image side of the fourth lens 4 .
- x c 2 ⁇ y 2 1 + 1 - ( K + 1 ) ⁇ c 2 ⁇ y 2 + Ay 4 + By 6 + Cy 8 + Dy 10 [ Equation ⁇ ⁇ 1 ]
- x is the distance along the optical axis from the vertex of the lens
- y is the distance in the direction vertical to the optical axis
- c is the inverse (1/R) of the radius of curvature on the vertex of the lens
- K is the conical constant
- A, B, C, and D are aspheric surface coefficients.
- the aspheric surface coefficients according to the first embodiment of the present invention as determined by the equation 1 are presented in Table 2.
- the third and fourth lenses 3 and 4 have a double aspheric surface.
- FIG. 2 shows the aberrations of the photographing lens according to the first embodiment of the present invention.
- the F-number Fno is 2.82
- the focal length f is 4.5 mm
- the angle of view (2 ⁇ ) is 59.46°.
- FIG. 3 illustrates the configuration of the photographing lens according to the second embodiment of the present invention.
- the configuration of the photographing lens according to the second embodiment is the same as that of the first embodiment, as shown in FIG. 3 .
- the symbol “*” indicates the aspheric surface.
- the first and fourth lenses 1 and 4 have a double aspheric surface.
- the aspheric surface coefficients according to the second embodiment of the present invention are presented in Table 4.
- FIG. 4 shows the aberrations of the photographing lens according to the second embodiment of the present invention.
- the F-number Fno is 2.80
- the focal length f is 5.6 mm
- the angle of view (2 ⁇ ) is 62.43°.
- FIG. 5 illustrates the configuration of the photographing lens according to the third embodiment of the present invention.
- the configuration of the photographing lens according to the third embodiment is the same as that of the first embodiment, as shown in FIG. 5 .
- FIG. 6 shows the aberrations of the photographing lens according to the third embodiment of the present invention.
- the F-number Fno is 3.18
- the focal length f is 7.0 mm
- the angle of view (2 ⁇ ) is 66.30°.
- FIG. 7 illustrates the configuration of the photographing lens according to the fourth embodiment of the present invention.
- the configuration of the photographing lens according to the fourth embodiment is the same as that of the first embodiment, as shown in FIG. 7 .
- FIG. 8 shows the aberrations of the photographing lens according to the fourth embodiment of the present invention.
- the embodiments of the present invention provide a photographing lens having telecentricity adequate for solid-state image pickup devices such as a CCD, and high resolution.
- the embodiments of the present invention also provide a photographing lens that has an adequate arrangement of refractive powers of the component lenses and aspheric surfaces and thereby can be miniaturized with high performance.
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Abstract
The present invention is directed to a photographing lens containing, in order from an object side: a first lens having a positive refractive power and a convex surface facing the object side; a second lens having a negative refractive power; a third lens having a positive refractive power; and a fourth lens having a negative refractive power and at least one aspheric surface, the photographing lens satisfying the following conditional expressions:
where LT denotes the distance on the optical axis between the object side of the first lens and the image side of the fourth lens; f denotes the total focal length of the photographing lens; and f3 denotes the focal length of the third lens.
Description
This application is a reissue application of U.S. patent application Ser. No. 10/744,770, filed Dec. 23, 2003, which issued as U.S. Pat. No. 6,917,479 on Jul. 12, 2005, the contents of which are incorporated herein by reference.
This application claims priority to and the benefit of Korea Patent Application No. 2002-87437 filed on Dec. 30, 2002 in the Korean Intellectual Property Office, the content of which is incorporated herein by reference.
The present invention relates to a photographing lens. More specifically, the present invention relates to a miniature photographing lens for cameras using an image pickup device such as charge coupled device (CCD).
Recently, the use of electronic still cameras and video cameras employing a CCD or a solid-state image pickup device has been expanding rapidly, and the needs for miniaturization and weight/cost savings are increasing. Miniaturization and weight/cost savings are also needed for photographing lenses that are built into cameras.
The optical system using a solid-state image pickup device employs a crystal filter so as to prevent moiré caused by the periodical structure of the image pickup device. Therefore, the thickness and location of the crystal filter must be taken into consideration in designing optical systems. In particular, the telecentricity of an incident ray to the image side to face an image forming plane is an important factor of the design.
Thus the photographing lens for cameras using a solid-state image pickup device must have good telecentricity and a long retrofocal length for the use of the crystal filter, as well as high resolution.
The photographing lens is also required to have a low F-number for entrance of a larger amount of light so as to compensate for the deterioration of sensitivity caused by the high pixel value of the solid-state image pickup device, and its compactness is needed to realize miniaturization and weight savings.
To satisfy these requirements, lens-designing technologies for adequately arranging the refractive powers of the component lenses of the photographing lens and precise technologies for realizing good performance are necessary.
The conventional optical systems using a solid-state image pickup device are as follows:
1) Japanese Patent Application Laid-Open No. Pyung 9-297264; and
2) Japanese Patent Application Laid-Open No. Pyung 10-293246.
The optical systems disclosed in the cited patents 1) and 2) are retrofocus optical systems comprising, in order from the object side, a lens group having a negative refractive power, an iris diaphragm, and a second lens group having a positive refractive power. These conventional optical systems may easily secure a large amount of peripheral light and have good telecentricity, but the correction of aberration, particularly distortion, is difficult to achieve, and the overall length of the optical systems is increased.
The present invention provides a compact photographing lens that has a high resolution with good telecentricity and a long retrofocal length as a photographing optical system of a camera using an image pickup device.
One embodiment of the present invention is directed to a photographing lens comprising, in order from an object side: a first lens having a positive refractive power and a convex surface on the object side; a second lens having a negative refractive power; a third lens having a positive refractive power; and a fourth lens having a negative refractive power and at least one aspheric surface, the photographing lens satisfying the following conditional expressions:
where LT denotes the distance on the optical axis between the object side of the first lens and the image side of the fourth lens; f denotes the total focal length of the photographing lens; and f3 denotes the focal length of the third lens. The third lens has at least one aspheric surface.
The photographing lens further satisfies the following conditional expressions:
where f1 denotes the focal length of the first lens; and f2 denotes the focal length of the second lens.
In addition, the photographing lens further satisfies the following conditional expressions:
|n3−n4|≧0.1
where n3 denotes the refractive index of the third lens; and n4 denotes the refractive index of the fourth lens.
|n3−n4|≧0.1
where n3 denotes the refractive index of the third lens; and n4 denotes the refractive index of the fourth lens.
Additionally, the photographing lens further satisfies the following conditional expressions:
where f4 denotes the focal length of the fourth lens.
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate an embodiment of the invention, and, together with the description, serve to explain the principles of the invention.
In the following detailed description, only a preferred embodiment of the invention has been shown and described, simply by way of illustration of the best mode contemplated by the inventor(s) of carrying out the invention. As will be realized, the invention is capable of modification in various obvious respects, all without departing from the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not restrictive.
Embodiments of the present invention provide a photographing lens having high resolution and good telecentricity, and can be miniaturized as a photographing optical system of cameras using an image pickup device.
As shown in FIGS. 1 , 3, 5, and 7, the photographing lens according to an embodiment of the present invention includes, in order from an object side, a first lens 1 having a positive refractive power, a second lens 2 having a negative refractive power, a third lens 3 having a positive refractive power, and a fourth lens 4 having a negative refractive power.
Additionally, the photographing lens has an iris diaphragm A located on the object side of the first lens 1, and a filter 5 on the image side of the fourth lens 4.
The following description describes the configuration of each lens of the four embodiments of the present invention depicted in FIGS. 1-8 .
The photographing lens according to an embodiment of the present invention basically has a second lens 2 having a negative refractive power after a first lens 1 having a positive refractive power, a third lens 3 having a positive refractive power after the second lens 2, and a fourth lens 4 having a negative refractive power after the third lens 3, so as to correct spherical aberration, coma, or chromatic aberration occurring near the optical axis by the first and second lenses 1 and 2 and to maintain telecentricity on the third lens 3. The arrangement of the fourth lens 4 contributes to the correction of abaxial aberrations such as astigmatism and distortion.
The photographing lens according to an embodiment of the present invention satisfies the following conditional expression:
where LT denotes the distance between the object side of the
The conditional expression 1 defines the ratio of the length of the photographing lens to the total focal length so as to realize the compactness of the photographing lens. When the ratio exceeds the upper limit of the conditional expression 1, the telecentricity may be better but the increased length makes it difficult to realize compactness of the photographing lens.
The photographing lens according to an embodiment of the present invention also satisfies the following conditional expression:
[Conditional Expression 2]
|n3−n4≧0.1
where n3 denotes the refractive index of the third lens 3; and n4 denotes the refractive index of thefourth lens 4.
|n3−n4≧0.1
where n3 denotes the refractive index of the third lens 3; and n4 denotes the refractive index of the
The conditional expression 2 defines the difference of refractive index between the third and fourth lenses 3 and 4. When the ratio falls below the lower limit of the conditional expression 2, the magnification chromatic aberration becomes large due to the increased difference of refractive index between the third and fourth lenses 3 and 4.
The photographing lens according to an embodiment of the present invention also satisfies the following conditional expression:
where f1 denotes the focal length of the
The photographing lens according to the embodiment of the present invention also satisfies the following conditional expression:
where f2 denotes the focal length of the
The photographing lens according to the embodiment of the present invention also satisfies the following conditional expression:
where f3 denotes the focal length of the third lens 3. The
The photographing lens according to the embodiment of the present invention also satisfies the following conditional expression:
where f4 denotes the focal length of the
The first to fourth embodiments of the present invention depicted in FIGS. 1-8 that satisfy the aforementioned conditions (conditional expressions 1 to 6) will be described.
In the description, “f” is the focal length, “ri (where i=1 to 11)” is the radius of curvature of a lens surface, “di (where i=1 to 11)” is the thickness of a lens or the distance between lenses, “nd” is the refractive index, and “v” is the Abbe's value. Here, the unit of length is “mm (millimeter)”.
For the photographing lens according to the first embodiment of the present invention, the F-number Fno is 2.82, the focal length f is 4.5 mm, and the angle of view (2ω) is 60.60°.
Various values associated with the component lenses of the photographing lens according to the first embodiment of the present invention are listed in Table 1.
TABLE 1 | ||||
Surface | Radius of | Thickness, | Refractive | |
Number | Curvature (r) | Distance (d) | Index (nd) | Variation (v) |
1 | ∞ | 0.150000 | ||
2 | 4.50400 | 1.260000 | 1.806 | 46.5 |
3 | −8.72100 | 0.470000 | ||
4 | −2.50000 | 0.500000 | 1.847 | 23.8 |
5 | 16.54200 | 0.170000 | ||
*6 | −13.96700 | 1.690000 | 1.743 | 49.3 |
*7 | −2.09300 | 0.100000 | ||
*8 | 2.57200 | 0.800000 | 1.525 | 56.4 |
*9 | 1.94700 | 1.390000 | ||
10 | ∞ | 0.500000 | 1.517 | 64.2 |
11 | ∞ | 1.000000 | ||
The symbol “*” indicates the aspheric surface. Aspheric surface coefficients can be expressed by the following equation:
where x is the distance along the optical axis from the vertex of the lens; y is the distance in the direction vertical to the optical axis; c is the inverse (1/R) of the radius of curvature on the vertex of the lens; K is the conical constant; and A, B, C, and D are aspheric surface coefficients.
The aspheric surface coefficients according to the first embodiment of the present invention as determined by the equation 1 are presented in Table 2. In the first embodiment, the third and fourth lenses 3 and 4 have a double aspheric surface.
TABLE 2 |
Aspheric Surface Coefficients |
of Sixth Face |
K | 0.000000 | |
A | 0.160073E−01 | |
B | −0.822184E−02 | |
C | 0.125395E−02 | |
D | 0.000000E+00 |
Aspheric Surface Coefficients |
of Seventh Face |
K | −5.182678 | |
A | −0.551418E−01 | |
B | 0.150488E−01 | |
C | −0.328615E−02 | |
D | 0.255345E−03 |
Aspheric Surface Coefficients |
of Eighth Face |
K | 0.000000 | |
A | −0.491192E−01 | |
B | −0.755780E−02 | |
C | 0.238448E−02 | |
D | −0.305757E−03 |
Aspheric Surface Coefficients |
of Ninth Face |
K | −1.853830 | |
A | −0.578054E−01 | |
B | 0.250117E−02 | |
C | 0.520886E−03 | |
D | −0.742182E−04 | |
For the photographing lens according to the second embodiment of the present invention, the F-number Fno is 2.82, the focal length f is 4.5 mm, and the angle of view (2ω) is 59.46°.
Various values associated with the component lenses of the photographing lens according to the second embodiment of the present invention are listed in Table 3.
TABLE 3 | ||||
Surface | Radius of | Thickness, | Refractive | |
Number | Curvature (r) | Distance (d) | Index (nd) | Variation (v) |
1 | ∞ | 0.150000 | ||
*2 | 3.67900 | 1.170000 | 1.806 | 40.7 |
*3 | −9.04300 | 0.300000 | ||
4 | −2.21800 | 0.500000 | 1.847 | 23.8 |
5 | 12.90500 | 0.130000 | ||
6 | −92.09900 | 1.740000 | 1.804 | 46.5 |
7 | −2.47900 | 0.100000 | ||
*8 | 3.82500 | 0.800000 | 1.607 | 27.6 |
*9 | 3.23800 | 1.540000 | ||
10 | ∞ | 0.500000 | 1.5168 | 64.2 |
11 | ∞ | 1.000000 | ||
The symbol “*” indicates the aspheric surface. In the second embodiment, the first and fourth lenses 1 and 4 have a double aspheric surface. The aspheric surface coefficients according to the second embodiment of the present invention are presented in Table 4.
TABLE 4 |
Aspheric Surface Coefficients |
of Second Face |
K | 3.117975 | |
A | −0.572230E−02 | |
B | −0.217344E−02 | |
C | 0.688181E−02 | |
D | −0.396604E−02 |
Aspheric Surface Coefficients |
of Third Face |
K | 12.412284 | |
A | −0.693221E−02 | |
B | 0.800818E−02 | |
C | −0.372426E−04 | |
D | 0.338160E−05 |
Aspheric Surface Coefficients |
of Eighth Face |
K | −0.770745 | |
A | −0.340273E−01 | |
B | −0.137097E−02 | |
C | −0.577892E−03 | |
D | −0.841877E−04 |
Aspheric Surface Coefficients |
of Ninth face |
K | −0.433161 | |
A | −0.353828E−01 | |
B | −0.985183E−03 | |
C | 0.303790E−04 | |
D | 0.102236E−04 | |
For the photographing lens according to the third embodiment of the present invention, the F-number Fno is 2.80, the focal length f is 5.6 mm, and the angle of view (2ω) is 62.43°.
Various values associated with the component lenses of the photographing lens according to the third embodiment of the present invention are listed in Table 5.
TABLE 5 | ||||
Surface | Radius of | Thickness, | Refractive | |
Number | Curvature (r) | Distance (d) | Index (nd) | Variation (v) |
1 | ∞ | 0.280000 | ||
2 | 5.35700 | 1.290000 | 1.835 | 43.0 |
3 | −26.73400 | 0.790000 | ||
4 | −3.50000 | 0.500000 | 1.847 | 23.8 |
5 | 15.89600 | 0.180000 | ||
*6 | −40.81200 | 2.190000 | 1.743 | 49.3 |
*7 | −2.72000 | 0.100000 | ||
*8 | 2.60100 | 0.800000 | 1.607 | 27.6 |
*9 | 2.08600 | 2.131000 | ||
10 | ∞ | 0.500000 | 1.5168 | 64.2 |
11 | ∞ | 1.000000 | ||
The symbol “*” indicates the aspheric surface. In the third embodiment, the third and
TABLE 6 |
Aspheric Surface Coefficients |
of Sixth Face |
K | 0.000000 | |
A | 0.574890E−02 | |
B | −0.35331.9E−02 | |
C | 0.793086E−03 | |
D | −0.513107E−04 |
Aspheric Surface Coefficients |
of Seventh Face |
K | −1.532735 | |
A | −0.149553E−01 | |
B | 0.370413E−02 | |
C | −0.753572E−03 | |
D | 0.598484E−04 |
Aspheric Surface Coefficients |
of Eighth Face |
K | −5.745605 | |
A | −0.105599E−01 | |
B | −0.319804E−02 | |
C | 0.420310E−03 | |
D | −0.110990E−04 |
Aspheric Surface Coefficients |
of Ninth face |
K | −1.547321 | |
A | −0.407695E−01 | |
B | 0.280992E−02 | |
C | −0.127053E−03 | |
D | 0.463035E−05 | |
For the photographing lens according to the fourth embodiment of the present invention, the F-number Fno is 3.18, the focal length f is 7.0 mm, and the angle of view (2ω) is 66.30°.
Various values associated with the component lenses of the photographing lens according to the fourth embodiment of the present invention are listed in Table 7.
TABLE 7 | ||||
Surface | Radius of | Thickness, | Refractive | |
Number | Curvature (r) | Distance (d) | Index (nd) | Variation (v) |
1 | ∞ | 0.500000 | ||
2 | 4.08100 | 1.480000 | 1.517 | 64.2 |
3 | −129.34100 | 1.460000 | ||
4 | −4.39100 | 0.600000 | 1.847 | 23.8 |
5 | 106.03700 | 0.220000 | ||
*6 | 103.53700 | 2.340000 | 1.806 | 40.7 |
*7 | −2.86400 | 0.100000 | ||
*8 | 3.52800 | 1.100000 | 1.607 | 27.6 |
*9 | 1.76500 | 2.030000 | ||
10 | ∞ | 0.500000 | 1.5168 | 64.2 |
11 | ∞ | 1.000000 | ||
The symbol “*” indicates the aspheric surface. In the third embodiment, the third and
TABLE 8 |
Aspheric Surface Coefficients |
of Sixth Face |
K | 0.000000 | |
A | 0.251650E−02 | |
B | −0.109474E−02 | |
C | 0.133684E−03 | |
D | −0.406126E−05 |
Aspheric Surface Coefficients |
of Seventh Face |
K | −3.679245 | |
A | −0.549879E−02 | |
B | 0.589170E−03 | |
C | −0.101550E−03 | |
D | 0.798107E−05 |
Aspheric Surface Coefficients |
of Eighth Face |
K | −10.364695 | |
A | −0.479419E−02 | |
B | −0.639085E−03 | |
C | 0.809810E−04 | |
D | −0.274455E−05 |
Aspheric Surface Coefficients |
of Ninth face |
K | −3.685431 | |
A | −0.107672E−01 | |
B | 0.581683E−03 | |
C | −0.246036E−04 | |
D | 0.367072E−06 | |
The photographing lenses according to the aforementioned embodiments of the present invention satisfy the above-stated conditions (Conditionals Expressions 1 to 6), and the various values for the respective conditional expressions are presented in Table 9.
TABLE 9 | |||
|
1 | 2 | 3 | 4 | |||
|
1.11 | 1.05 | 1.05 | 1.03 | ||
|
0.22 | 0.20 | 0.14 | 0.20 | ||
Conditional Expression 3 | 0.85 | 0.75 | 1.20 | 1.70 | ||
|
−0.56 | −0.48 | −0.74 | −1.09 | ||
|
0.69 | 0.69 | 0.85 | 0.77 | ||
Conditional Expression 6 | −6.05 | −15.87 | −9.32 | −1.63 | ||
While this invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
As described above, the embodiments of the present invention provide a photographing lens having telecentricity adequate for solid-state image pickup devices such as a CCD, and high resolution.
The embodiments of the present invention also provide a photographing lens that has an adequate arrangement of refractive powers of the component lenses and aspheric surfaces and thereby can be miniaturized with high performance.
Claims (14)
1. A photographing lens comprising, in order from an object side:
a first lens having a positive refractive power and a convex surface facing the object side;
a second lens, separate from the first lens, having a negative refractive power;
a third lens having a positive refractive power, aspheric surfaces on both sides, and a concave surface on the object side; and
a fourth lens having a negative refractive power and at least one aspheric surface surfaces on both sides,
the photographing lens satisfying the following conditional expressions:
wherein LT denotes the distance on the optical axis between the object side of the first lens and the image side of the fourth lens; f denotes the total focal length of the photographing lens; f1 denotes the focal length of the first lens; and f3 denotes the focal length of the third lens.
2. The photographing lens as claimed in claim 1 , wherein the third lens has at least one aspheric surface.
3. The photographing lens as claimed in claim 1 , wherein the photographing lens further satisfies the following conditional expressions expression:
wherein f1 denotes the focal length of the first lens; and f2 denotes the focal length of the second lens.
4. The photographing lens as claimed in claim 1 , wherein the photographing lens further satisfies the following conditional expressions:
|n3−n4|≧0.1
|n3−n4|≧0.1
wherein n3 denotes the refractive index of the third lens; and n4 denotes the refractive index of the fourth lens.
5. The photographing lens as claimed in claim 1 , wherein the photographing lens further satisfies the following conditional expressions:
wherein f4 denotes the focal length of the fourth lens.
6. The photographing lens as claimed in claim 1, wherein the photographing lens satisfies the following expression:
0.85<f1/f<2.0.
0.85<f1/f<2.0.
7. The photographing lens as claimed in claim 1, wherein the photographing lens comprises an iris diaphragm located on the object side of the first lens.
8. A photographing lens comprising, in order from an object side:
a first lens having a positive refractive power, a convex surface facing the object side, and aspheric surfaces on both sides;
a second lens having a negative refractive power;
a third lens having a positive refractive power and a concave surface on the object side; and
a fourth lens having a negative refractive power and aspheric surfaces on both sides, the photographing lens satisfying the following conditional expressions:
0.75<f1/f<2.0
0.75<f1/f<2.0
wherein LT denotes the distance on the optical axis between the object side of the first lens and the image side of the fourth lens; f denotes the total focal length of the photographing lens; f1 denotes the focal length of the first lens; and f3 denotes the focal length of the third lens.
9. The photographing lens as claimed in claim 8, wherein the photographing lens satisfies the following conditional expression:
0.85<f1/f<2.0.
0.85<f1/f<2.0.
10. The photographing lens as claimed in claim 8, wherein the photographing lens comprises an iris diaphragm located on the object side of the first lens.
11. A photographing lens comprising, in order from an object side:
a first lens having a positive refractive power and a convex surface facing the object side;
a second lens having a negative refractive power;
a third lens having a positive refractive power; and
a fourth lens having a negative refractive power and at least one aspheric surface, the photographing lens satisfying the following conditional expressions:
wherein LT denotes the distance on the optical axis between the object side of the first lens and the image side of the fourth lens; f denotes the total focal length of the photographing lens; f1 denotes the focal length of the first lens; and f3 denotes the focal length of the third lens.
12. The photographing lens as claimed in claim 11, wherein the photographing lens comprises an iris diaphragm located on the object side of the first lens.
13. The photographing lens as claimed in claim 10, wherein the third lens has aspheric surfaces on both sides and the fourth lens has aspheric surfaces on both sides.
14. The photographing lens as claimed in claim 10, wherein the first lens has aspheric surfaces on both sides and the fourth lens has aspheric surfaces on both sides.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/487,817 USRE45592E1 (en) | 2002-12-30 | 2014-09-16 | Photographing lens |
US14/753,849 USRE46507E1 (en) | 2002-12-30 | 2015-06-29 | Photographing lens |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2002-0087437A KR100509370B1 (en) | 2002-12-30 | 2002-12-30 | Photographing lens |
KR10-2002-0087437 | 2002-12-30 | ||
US10/744,770 US6917479B2 (en) | 2002-12-30 | 2003-12-23 | Photographing lens |
US14/487,817 USRE45592E1 (en) | 2002-12-30 | 2014-09-16 | Photographing lens |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/744,770 Reissue US6917479B2 (en) | 2002-12-30 | 2003-12-23 | Photographing lens |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/744,770 Continuation US6917479B2 (en) | 2002-12-30 | 2003-12-23 | Photographing lens |
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Publication Number | Publication Date |
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USRE45592E1 true USRE45592E1 (en) | 2015-06-30 |
Family
ID=32709767
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US10/744,770 Ceased US6917479B2 (en) | 2002-12-30 | 2003-12-23 | Photographing lens |
US14/487,817 Expired - Lifetime USRE45592E1 (en) | 2002-12-30 | 2014-09-16 | Photographing lens |
US14/753,849 Expired - Lifetime USRE46507E1 (en) | 2002-12-30 | 2015-06-29 | Photographing lens |
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US10/744,770 Ceased US6917479B2 (en) | 2002-12-30 | 2003-12-23 | Photographing lens |
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US14/753,849 Expired - Lifetime USRE46507E1 (en) | 2002-12-30 | 2015-06-29 | Photographing lens |
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KR (1) | KR100509370B1 (en) |
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US20160191764A1 (en) * | 2014-12-19 | 2016-06-30 | Sheng-Wei Hsu | Optical imaging lens and electronic device comprising the same |
Also Published As
Publication number | Publication date |
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US20040136097A1 (en) | 2004-07-15 |
USRE46507E1 (en) | 2017-08-08 |
KR100509370B1 (en) | 2005-08-19 |
KR20040060621A (en) | 2004-07-06 |
US6917479B2 (en) | 2005-07-12 |
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