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Photographing lens

a technology of photographing lens and lens body, which is applied in the field of photographing lens, can solve the problems of difficult to achieve aberration correction, especially distortion, and increase the overall length of the optical system, and achieves good telecentricity, long retrofocal length, and high resolution

Active Publication Date: 2015-06-30
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention offers a small camera lens with high resolution and good telecentricity, making it easy to capture photos. Additionally, the lens has a long retrofocal length, making it ideal for cameras using image pickup devices. This invention allows for more precise and accurate photography in a compact package.

Problems solved by technology

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.

Method used

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Experimental program
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Effect test

first embodiment

[0053]For the photographing lens according to 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°.

[0054]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. In addition, the photographing lens has filter 5 arranged on the image side of the fourth lens 4.

[0055]Various values associated with the component lenses of the photographing lens according to the first embodiment of the present invention are listed in ...

second embodiment

[0061]For the photographing lens according to 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°.

[0062]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.

[0063]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.

[0064]

TABLE 3SurfaceRadius ofThickness, RefractiveNumberCurvature (r)Distance (d)Index (nd)Variation (v)1∞0.150000*23.679001.1700001.80640.7*3−9.043000.3000004−2.218000.5000001.84723.8512.905000.1300006−92.099001.7400001.80446.57−2.479000.100000*83.825000.8000001.60727.6*93.238001.54000010∞0.5000001.516864.211∞1.000000

[0065]The symbol “*” indicates the aspheric surface. In the second embodimen...

third embodiment

[0068]For the photographing lens according to 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°.

[0069]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.

[0070]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.

[0071]

TABLE 5SurfaceRadius ofThickness,RefractiveNumberCurvature (r)Distance (d)Index (nd)Variation (v)1∞0.28000025.357001.2900001.83543.03−26.734000.7900004−3.500000.5000001.84723.8515.896000.180000*6−40.812002.1900001.74349.3*7−2.720000.100000*82.601000.8000001.60727.6*92.086002.13100010∞0.5000001.516864.211∞1.000000

The symbol “*” indicates the aspheric surface. In the third embodiment, the thi...

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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:LTf≤1.20.5≤f3f≤1.0where 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

CROSS REFERENCE TO RELATED APPLICATION [0001]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.[0002]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.FIELD OF THE INVENTION[0003]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).BACKGROUND OF THE INVENTION[0004]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. Mini...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G02B13/22G02B9/34G02B15/173G02B13/16G02B13/18G02B13/00G02B27/28G02B7/02
CPCG02B13/004G02B13/16G02B13/18G02B13/22G02B27/286G02B9/34G02B15/173
Inventor PARK, YOUNG-WOO
Owner SAMSUNG ELECTRONICS CO LTD