Zoom lenses and zoom lens modules

Abstract

A zoom lens and a zoom lens module are disclosed. The zoom lens is suitable for imaging a scenery of an object side to an imaging surface of an image side. The zoom lens comprises a first lens group, a second lens group, a third lens group and a fourth lens group. The first lens group is configured between the object side and the image side and possesses a negative diopter. The second lens group is configured between the first lens group and the image side and possesses a positive diopter. The third lens group is configured between the second lens group and the image side and possesses the negative diopter. The fourth lens group is configured between the third lens group and the image side. The zoom lens accords with the following formulas: 16>= C. R. A. (W) / ImgH>=10; and 15>= C. R. A. (T) / ImgH>= 7, wherein the C. R. A. (W) is an incidence angle of a zoom lens primary ray which irradiates to a largest field of a light detector when the zoom lens is in a wide angle end state; the C. R. A. (T) is an incidence angle of a zoom lens primary ray which irradiates to the largest field of the light detector when the zoom lens is in a telescopic end state; and the ImgH is a largest image height of the light detector.

Description

technical field [0001] The present invention relates to a lens and a lens module, and in particular to a zoom lens and a zoom lens module. Background technique [0002] With the advancement of modern video technology, in recent years, the demand for high-resolution, high-quality digital video camera (DVC) and digital camera (digital camera, DC) lenses has gradually increased, and is moving towards miniaturization and large aperture. Developed with a wide viewing angle. One of the core elements of these imaging devices is a zoom lens. The optical zoom of the zoom lens can make the far and near images clearly imaged. Therefore, the optical quality of the zoom lens is closely related to the image quality. In the fiercely competitive market, various manufacturers are committed to improving the quality of the zoom lens and reducing its production cost, so as to enhance the competitive advantage of the above-mentioned imaging devices. [0003] However, the current design of the ...

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Problems solved by technology

[0003] However, the current design of the periscope zoom lens is difficult to achieve high resolution, large aperture and wide viewing angle at the same time due to the difficulty in processing and limited by stricter tolerances.

In addition, when using a digital camera at night with a small aperture, it is easy to face the dilemma of insufficient luminous flux, more noise, and underexposure

For example, the F-numbers (F-number) of the apertures disclosed in US Patent No. 7466500 and US No. 7180684 are both above 3.5, so it is easy to face the problem of insufficient luminous flux

[0004] In addition, the zoom lens proposed in U.S. Patent No. 7,286,299 not only fails to meet the needs of a large aperture, but also has a small field of view (FOV) (2ω), which will lead to the shortcomings of narrowing the shooting range and insufficient luminous flux. Unable to meet user needs

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