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Subminiature optical system

a sub-miniature and optical system technology, applied in the field of imaging optical systems, can solve the problems of limited design flexibility and unsatisfactory optical capability, and achieve the effects of less manufacturing cost, easy manufacturability, and light weigh

Active Publication Date: 2007-08-16
SAMSUNG ELECTRO MECHANICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]Further another aspect of the invention is to provide a subminiature imaging optical system which employs a plurality of plastic lenses to ensure lighter weight, easy manufacturability, mass-producibility and less manufacturing costs.
[0012]Further another aspect of the invention is to provide a subminiature imaging optical system which adopts an aspherical lens to be high-definite and superior in various optical properties.

Problems solved by technology

Furthermore, the photographing lenses installed in the mobile phones should be less numbered to achieve miniaturization and low cost, which however accompanies limited flexibility in design and unsatisfactory optical capability.

Method used

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Examples

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example 1

[0067]Table 1 below shows exemplary aberrations of a subminiature optical system according to Example 1 of the invention. FIG. 1 is a diagram illustrating lens arrangement of the subminiature optical system according to Example 1 of the invention. FIGS. 2a to 2c are aberrational diagrams illustrating the optical system shown in Table 1 and FIG. 1. Meanwhile, in the following astigmatic aberration diagram, “S” denotes sagittal and “T” denotes tangential.

[0068]In Example 1, an F number FNo is 2.8, an angle of view is 60 degree, a distance TL between the aperture stop and the image plane is 6.07 mm, and an effective focal distance f of the optical system is 4.6 mm. Also, in Example 1, the first lens L1, the third lens L3, and the fourth lens L4 are made of plastics.

TABLE 1Radius ofPlaneAbbePlaneCurvatureInterval tRefractiveNumberNo.R(mm)(mm)Index ndvdRemarks1∞0.800000Aperture stop*21.709080.8800001.51764.2First lens*3−3.756900.1000004−10.000000.4000001.71729.5Second lens53.000000.65000...

example 2

[0070]Table 3 below demonstrates aberrations of a subminiature optical system according to Example 2 of the invention. FIG. 3 is a diagram illustrating lens arrangement of the subminiature optical system according to Example 2 of the invention. FIGS. 4a to 4c are aberrational diagrams illustrating the optical system shown in Table 3 and FIG. 3.

[0071]In Example 2, an F number FNo is 2.8, an angle of view is 60 degree, a distance TL between the aperture stop and an image plane is 5.96 mm, an effective focal distance f of the optical system is 4.85 mm. Also, in Example 2, the first, third and fourth lenses L1, L3 and L4 are made of plastics.

TABLE 3Radius ofPlaneAbbePlaneCurvatureIntervalRefractiveNumberNo.R(mm)t(mm)Index ndvdRemarks1∞0.050000Aperture stop*21.774850.8000001.52955.8First lens*3−8.374630.1300004−20.984580.4000001.71729.5Second lens53.061860.850000*6−2.412890.9071171.52955.8Third lens*7−1.211720.120000*85.106470.7000001.52955.8Fourth lens*91.614730.43186110∞0.3000001.51764...

example 3

[0073]Table 5 below indicates aberrations of a subminiature optical system according to Example 3 of the invention. FIG. 5 is a diagram illustrating lens arrangement of the subminiature optical system according to Example 3 of the invention. FIGS. 6a to 6c are aberrational diagrams illustrating the optical system shown in Table 5 and FIG. 5.

[0074]In Example 3, an F number FNo is 2.8, an angle of view is 60 degree, a distance TL between the aperture stop and an image plane is 7.22 mm, and an effective focal distance f of the optical system is 6 mm. Also, in Example 3, the first, third and fourth lenses L1, L3 and L4 are made of plastics.

TABLE 5Radius ofPlanePlaneCurvature RInterval tRefractiveAbbeNo.(mm)(mm)Index ndnumberRemarks1∞0.058564Aperturestop*22.078840.9370211.52955.8First lens*3−9.809000.1522664−24.578730.4685101.75527.5Second lens53.586280.995584*6−2.826161.0624851.52955.8Third lens*7−1.419260.140553*85.981080.8198931.52955.8Fourth lens*91.891290.50582810∞0.3513831.51764.2C...

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Abstract

A subminiature imaging optical system suitable for a subminiature optical device such as a mobile phone camera. An aperture stop is provided. A first lens has a positive refractive power and is convex at an object side. A second lens has a negative refractive power. A third lens has a positive refractive power. Also, a fourth lens has a negative refractive power. The optical system has a total length along an optical axis direction according to following relation 1:1.2<TL / f<1.5 relation 1,where TL is a distance from the aperture stop to an image plane, and f is an effective focal distance of an entire optical system.

Description

CLAIM OF PRIORITY[0001]This application claims the benefit of Korean Patent Application No. 2006-14476 filed on Feb. 15, 2005 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention relates to an imaging optical system, and more particularly, to a subminiature imaging optical system which is suitably applicable to a subminiature optical device such as a mobile phone camera.[0004]2. Description of the Related Art[0005]In general, mobile phones featured only a communicative function at an incipient stage. However, with their use broadened, various services such as photographing or image transmission or communication have been in demand, accordingly evolving the function and services thereof. Recently, the spotlight has been given to a new concept of mobile phones, so-called, camera phones or camera mobile phones integrating digital camera technology with mobile...

Claims

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Application Information

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IPC IPC(8): G02B9/34
CPCG02B13/004G02B9/34G02B1/041G02B13/18
Inventor JO, YONG JOOPARK, JONG CHEOL
Owner SAMSUNG ELECTRO MECHANICS CO LTD
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