Thin wide-angle four-piece imaging lens group

Abstract

A thin wide-angle four-piece imaging lens set comprises an optical set and a fixed diaphragm, wherein the optical set sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an image side along a central optical axis, the refractive power of the first lens, the second lens, the third lens and the fourth lens is positive, positive, negative and positive respectively, the first lens and the third lens face the object side, the parts, close to the central optical axis, of the first lens and the third lens are a convex surface and a concave surface respectively, the second lens faces the image side, the part, close to the central optical axis, of the second lens is a convex surface, the third lens faces the image side, the part, close to the central optical axis, of the third lens is a convex surface, the fourth lens faces the image side, the part, close to the central optical axis, of the fourth lens is a concave surface, and at least one inflection point is located from the central optical axis to an aspheric-surface termination point of the fourth lens; the fixed diaphragm is located between the object side and the second lens. The lens set meets the condition that the quotient of HFOV (high-frequency oscillatory ventilation) divided by f is larger than 15 and smaller than 50, HFOV is half of the largest viewing angle used by the lens set, and f is a focal length value of the imaging lens set; the whole imaging lens set can be more compact and the resolving power is improved due to the facts that a value of HFOV is large and a value of f is small; meanwhile, the imaging lens set has the advantages that the imaging lens set is light, thin, short, small and high in efficiency.

Description

technical field [0001] The invention relates to an imaging lens group, in particular to a thin wide-angle four-chip imaging lens group. Background technique [0002] The existing imaging lens group is suitable for imaging lens groups in electronic products such as mobile phones, smart phones, tablet computers, notebook computers, and cameras. With the continuous development of such electronic products, there is a tendency of thinner and smaller design gradually, but at the same time, high performance is required. Therefore, the imaging lens group is developed towards a thinner and more compact overall size. In order to improve the resolution, the imaging The lens group also needs to develop towards a wider angle. [0003] The existing imaging lens sets, such as Chinese Taiwan patents TW201215941A, TW201224568A, TW201239443A, etc., although disclose a four-piece imaging lens set, the implementation of the previously disclosed patents can not further meet the thin and wide-an...

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Problems solved by technology

[0003] However, the existing imaging lens groups, such as Chinese Taiwan patents TW201215941A, TW201224568A, TW201239443A, etc., although revealing a four-piece imaging lens group, the implementation of the previously disclosed patents failed to further meet the thin and wide-angle requirements.

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