Single focus lens

Abstract

The single focus lens with the advantage of wide view field includes the first optical module with weak refraction index, the second optical module with positive refraction index, the third optical module with negative refraction index, the fourth optical module with positive refraction index, the fifth optical module with positive refraction index and one image sensing unit successively arranged from the object space to the image space. The single focus lens meets the following conditions: 0<f23 / f1<0.12; where f23 is the combination focus length of the second optical module and the third optical module and f1 is the focus length of the first optical module.

Description

technical field [0001] The present invention relates to a single focus lens, in particular to a single focus lens which can be applied to a handheld camera device. Background technique [0002] The miniaturization and the increase of the pixels of the image sensing unit have made the requirements for the camera lens more and more strict. At the same time, the application of low-cost and wide-angle video optical systems is becoming more and more extensive, such as monitors, vehicle lenses and endoscopes. Japanese Laid-Open Patent Publication No. Sho 61-035,414 discloses a wide viewing angle inner lens. The inner lens has four optical components and a crescent lens adjacent to the imaging end. [0003] However, although the internal view lens disclosed in Japanese Patent Application Laid-Open No. 61-035,414 can correct the distortion aberration, it cannot make all the light incident on the lens from the object end enter the CCD vertically, so shadows are generated. [0004] ...

AI Technical Summary

Problems solved by technology

However, this design makes the entire optical system more complicated

[0005] Japanese Laid-Open Patent Publication No. 05-107,470 discloses an objective optical system, but it still cannot solve the problem of shadows

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