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Imaging optical lens group and automatic focusing operating method thereof

An imaging optics and lens group technology, applied in optics, optical components, instruments, etc., can solve the problems of large power consumption, long optical length of the overall lens module, etc., achieve good imaging quality, reduce variability, and reduce crowd The effect of the number of groups

Active Publication Date: 2012-02-29
LARGAN PRECISION
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AI Technical Summary

Problems solved by technology

Generally, for a photographic lens with adjustable focus function, the method of adjusting the focus is to use a drive motor to change the relative distance between the overall photographic lens and the image sensor. Since the overall photographic lens must be driven, the power consumption is relatively large, and the overall lens The overall optical length of the module will also be longer

Method used

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  • Imaging optical lens group and automatic focusing operating method thereof
  • Imaging optical lens group and automatic focusing operating method thereof
  • Imaging optical lens group and automatic focusing operating method thereof

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Embodiment Construction

[0053] The present invention provides an imaging optical lens group, which includes sequentially from the object side to the image side: a first lens group, which is only composed of a first lens with positive refractive power, and the first lens and the subject There is no lens with refractive power in between; and a second lens group, which includes in sequence from the object side to the image side: a second lens with negative refractive power, a third lens and a fourth lens; when the subject When the distance from the imaging optical lens group is from far to near, the first lens moves along the optical axis, and its distance from the imaging surface is from near to far to perform focus adjustment; and in the imaging optical lens group, there is a refractive power The number of lenses is N, which satisfies the following relationship: 4≤N≤5.

[0054] When N=5, the fifth lens may be placed between the first lens and the second lens, between the third lens and the fourth lens...

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Abstract

The invention provides an imaging optical lens group and an automatic focusing operating method thereof. The imaging optical lens group sequentially comprises a first lens group and a second lens group from an object side to an image side, wherein the first lens group only comprises a first lens with positive refractive force; no any lens with refractive force is arranged between the first lens and an imaged object; the second lens group sequentially comprises a second lens with negative refractive force, a third lens and a fourth lens from the object side to the image side; when the distancebetween the imaged object and the imaging optical lens group is decreased gradually, the distance is increased for executing focusing adjustment by moving the first lens along an optical axis; and inthe imaging optical lens group, the number of the lenses with the refractive force is N: 4<=N<=5. The invention has good imaging quality and smaller consumption power by lens configuration and the focusing operating method.

Description

technical field [0001] The present invention relates to an imaging optical lens group; in particular, it refers to an imaging optical lens group applied to a mobile phone camera and an automatic focusing operation method thereof. Background technique [0002] In recent years, with the rise of mobile phone cameras, the demand for miniaturized photographic lenses has increased day by day, and the photosensitive elements of general photographic lenses are nothing more than photocoupled devices (Charge Coupled Device, CCD) or complementary metal oxide semiconductor (Complementary Metal-Oxide Semiconductor, CMOS), and due to the advancement of semiconductor process technology, the pixel area of ​​the photosensitive element is reduced, and the miniaturized photographic lens is gradually developing into the high-pixel field. Therefore, the requirements for imaging quality are also increasing. [0003] Traditional miniaturized photographic lenses mounted on mobile phone cameras usua...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B15/15G02B13/00
Inventor 陈俊杉汤相岐
Owner LARGAN PRECISION
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