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Composite lens system

A composite lens system and lens technology, applied in optical components, optics, instruments, etc., can solve the problems of poor impact resistance, increased lens weight, and easy damage of the lens, and achieve the effect of light weight

Inactive Publication Date: 2007-04-04
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After adopting the above structure, the size of the lens is small, and the lens is made of spherical glass lens, which is easy to process, but the material is made of glass, which increases the weight of the lens, and the use of glass material makes it less impact resistant, and it is accidentally dropped to the ground. The lens is easily damaged when the camera is on. In addition, the application of spherical lenses will inevitably bring about spherical aberration, which will affect the imaging performance.

Method used

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Embodiment Construction

[0015] Please refer to FIG. 1 , which is a compound lens system 100 according to an embodiment of the present invention, including: a first lens 10 , a second lens 20 , a third lens 30 and a fourth lens 40 arranged in sequence from the object side to the image side. In addition, a diaphragm 50 is disposed on the object side of the first lens 10 , and a flat plate element 60 and an image sensor 70 are sequentially disposed on the image side of the fourth lens 40 .

[0016] The first lens 10 is a lens with a positive focal length, and the refractive index and dispersion are n 1 = 1.53116, v 1 =56.04 optical plastic material, the first and second surfaces 11, 12 are convex, the first surface 11 or the second surface 12 can be coated with an infrared cut-off film to eliminate the impact of infrared on imaging quality. The second lens 20 is a lens with a negative focal length, and the refractive index and dispersion are respectively n 2 = 1.60726, v 2 =26.645 made of optical pla...

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Abstract

A composite lens system is prepared as setting the first plastic lens, the second plastic lens, the third plastic lens and the fourth plastic lens in sequence from object side to image side on said lens system, setting the first plastic lens and the third plastic lens to be lens with focal distance in positive value and the second plastic lens and the fourth plastic lens to be lens with focal distance in negative value as well as setting all four said lens to be nonspherical structures.

Description

【Technical field】 [0001] The invention relates to a compound lens system, in particular to a compound lens system applicable to mobile phones. 【Background technique】 [0002] A digital camera is a new product that combines optics, precision machinery and electronic technology, and generally includes a lens and a CCD (Charge Coupled Device) or CMOS (Complementary Metal-Oxide Semiconductor) image sensor. CCDs or CMOSs ​​with different resolutions require corresponding digital camera lenses to match them to meet the requirements of the best imaging performance. Especially with the combination of digital cameras and portable electronic devices such as mobile phones, higher requirements are put forward for digital camera lenses. in the phone. [0003] In an existing digital camera lens, according to the order from the object side to the image side, the lens includes a first lens, a second lens, a third lens and a fourth lens, wherein the first lens is a biconvex lens, The seco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B9/34
CPCG02B9/34G02B13/004G02B13/001G02B13/18
Inventor 孙文信
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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