Miniature taking lens

Abstract

The invention provides a miniature taking lens, which is applicable to a mobile phone and a miniature digital camera. The miniature taking lens comprises an aperture diaphragm, a first lens and a second lens sequentially from an object end to an image end, wherein the first lens is crescent-shaped, and the convex surface of the first lens faces the object end; the second lens is crescent-shaped, and the convex surface of the second lens faces the image end; and each of the first and second lenses is made from plastics, and has at least one aspheric surface. The miniature taking lens is in accordance with conditions that f1 / EFL is more than 0.1 and less than 2 and that R1 / R2 is more than 0.1 and less than 2, wherein f1 is the focal length of the first lens; EFL is the effective focal length of the miniature taking lens; and R1 and R2 are the curvature radiuses of the object end surface and image end surface of the first lens respectively. The miniature taking lens has a compact structure, is relatively lower in cost and easy to manufacture, satisfies the needs of massive production and can ensure relatively higher imaging quality.

Description

technical field [0001] The invention relates to a miniature imaging lens, in particular to a miniature imaging lens with high performance, low cost and small size, which is composed of two lenses and is suitable for use in mobile phones and small digital cameras. Background technique [0002] The integration of mobile communication devices such as mobile phones, personal digital assistants (PDAs) and optoelectronic technology has become one of the trends in today's technological development, and camera phones are a typical representative of this technology trend. As far as the design is concerned, in order to be convenient to carry and meet the needs of humanization, the imaging lens of the camera phone not only needs to have good image quality, but also needs to be small in size and low in cost. Therefore, unlike the adjustable focus and variable focus lenses of traditional cameras, video cameras, and general digital cameras, the imaging lenses used in camera phones are muc...

AI Technical Summary

Problems solved by technology

Due to the difficulty of grinding the glass lens, which increases the complexity of manufacturing and is expensive, this configuration not only loses its competitiveness in terms of mass production and price factors, but also makes the overall length of the lens still long, and the weight is also due to the Contains a glass lens and is still heavy

In addition, the aspheric surface of the aspheric lens used in this type of imaging lens often has large turning and undulations, which further increases the difficulty of manufacturing

Therefore, there is still room for further improvement of the existing three-element lens of this type

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