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Optical imaging system

An optical imaging system and imaging surface technology, applied in optics, optical components, instruments, etc., can solve problems such as increased imaging distortion rate, failure to meet photography requirements, and deterioration of peripheral imaging quality

Active Publication Date: 2016-08-24
ABILITY OPTO ELECTRONICS TECH
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Problems solved by technology

However, the optical system designed with a large aperture often faces the situation of producing more aberrations, resulting in the deterioration of the surrounding imaging quality and the difficulty of manufacturing, while the optical system designed with a wide viewing angle will face an increase in the distortion rate of imaging. The advanced optical imaging system can no longer meet the requirements of more advanced photography

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Embodiment approach

[0150] The sum of the focal lengths fp of each lens with positive refractive power in the optical imaging system is ΣPP, and the sum of the focal lengths of each lens with negative refractive power is ΣNP. An embodiment of the optical imaging system of the present invention satisfies the following conditions: <ΣPP≦200; and f1 / ΣPP≦0.85. Preferably, the following conditions may be satisfied: 0<ΣPP≦150; and 0.01≦f1 / ΣPP≦0.6. Therefore, it is helpful to control the focusing ability of the optical imaging system, and properly distribute the positive refractive power of the system to suppress the premature occurrence of significant aberrations.

[0151] The first lens may have positive refractive power, and its object side may be convex. Thus, the positive refractive power of the first lens can be properly adjusted, which helps to shorten the total length of the optical imaging system.

[0152] The second lens may have negative refractive power. Thereby, aberrations generated by t...

no. 1 example

[0181] Please refer to Figure 1A and Figure 1B ,in Figure 1A A schematic diagram showing an optical imaging system according to a first embodiment of the present invention, Figure 1B From left to right are the spherical aberration, astigmatism and optical distortion curves of the optical imaging system of the first embodiment. Figure 1C It is a TV distortion curve diagram of the optical imaging system of the first embodiment. Depend on Figure 1A It can be seen that the optical imaging system includes an aperture 100, a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, an infrared filter 170, an imaging surface 180, and an image sensing element sequentially from the object side to the image side. 190.

[0182]The first lens 110 has positive refractive power and is made of plastic material. The object side 112 is convex and the image side 114 is concave, both of which are aspherical. Both the object side 112 and the image side 114 have an inflection...

no. 2 example

[0224] Please refer to Figure 2A and Figure 2B ,in Figure 2A A schematic diagram showing an optical imaging system according to a second embodiment of the present invention, Figure 2B From left to right are the spherical aberration, astigmatism and optical distortion curves of the optical imaging system of the second embodiment. Figure 2C It is a TV distortion curve diagram of the optical imaging system of the second embodiment. Depend on Figure 2A It can be seen that the optical imaging system sequentially includes a first lens 210, an aperture 200, a second lens 220, a third lens 230, a fourth lens 240, an infrared filter 270, an imaging surface 280, and an image sensing element from the object side to the image side. 290.

[0225] The first lens 210 has positive refractive power and is made of plastic material. The object side 212 is convex, and the image side 214 is convex, both of which are aspherical. The object side 212 has an inflection point.

[0226] The ...

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Abstract

An optical imaging system includes a first lens, a second lens, a third lens, and a fourth lens in order from the object side to the image side. The first lens has positive refractive power and its object side can be a convex surface. The second lens to the third lens has refractive power, and both surfaces of the above lenses may be aspherical. The fourth lens may have negative refractive power, and the image-side surface of the fourth lens may be concave. The both surfaces of the fourth lens are aspherical, wherein at least one surface of the fourth lens has a reverse curvature. The lenses having refractive power in the optical imaging system are the first lens to the fourth lens. When the specific conditions are met, greater light receiving ability and better light adjustment ability can be realized to enhance the imaging quality.

Description

technical field [0001] The invention relates to an optical imaging system group, more specifically, to a miniaturized optical imaging system applied to electronic products. Background technique [0002] In recent years, with the rise of portable electronic products with photography functions, the demand for optical systems has increased day by day. The photosensitive element of the general optical system is nothing more than two types of photosensitive coupling device (Charge Coupled Device; CCD) or complementary metal oxide semiconductor element (Complementary Metal-Oxide SemiconduTPor Sensor; CMOSSensor), and with the improvement of semiconductor manufacturing technology, The pixel size of the photosensitive element is reduced, and the optical system is gradually developing into the high-pixel field, so the requirements for image quality are also increasing. [0003] Traditional optical systems mounted on portable devices mostly use two-element or three-element lens struc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B13/18
CPCG02B13/004G02B13/18
Inventor 刘耀维张永明
Owner ABILITY OPTO ELECTRONICS TECH
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