Four-element high-resolution day-and-night dual-purpose multipoint varifocal lens

Abstract

The invention relates to video devices, monitoring devices and pick-up lens devices, in particular to a four-element high-resolution day-and-night dual-purpose multipoint varifocal lens. The multipoint varifocal lens in a novel four-element structural style has the advantages of high optical zoom ratio, large focal length, large aperture, high resolution, wide light spectrum, confocal property and the like; and the multipoint varifocal lens also has the characteristic of small structural length. The light path is composed of a front fixing element (A), an optical zooming element (B), a back fixing element (D) and a compensation element (E). Since the optical zooming element (B) and the compensation element (E) correspondingly move back and forth along the optical axis, the focal length ofthe optical system can be conveniently changed. In the light path design process, the focal power of the four elements are reasonably distributed, so that the optical lens has the performance indexesof high optical zoom ratio, large focal length and large relative aperture.

Description

technical field [0001] The invention relates to a video surveillance camera lens device, in particular to a four-component high-resolution day and night dual-purpose multi-point zoom lens. Background technique [0002] like figure 2 Shown is the schematic diagram of the result of the existing four-component multi-point zoom lens. The four-component multi-point zoom lens was used in the video camera system as early as the 1990s, but its optical performance index is low, and the magnification is variable. The ratio is less than 10, and the longest focal length is about 50~60mm; no ultra-low dispersion glass is used in the optical path, the resolution of the lens is relatively low, and it can only be adapted to CCD or CMOS cameras with 20~30 pixels, and it is not suitable for wide spectral range. With chromatic aberration correction, the lens adapts to a narrow spectral range, and can only be used under the daylight conditions of 480nm to 650nm. SUMMARY OF THE INVENTION [...

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Problems solved by technology

[0002] like figure 2 Shown is a schematic diagram of the results of the existing four-element multi-point zoom lens. The four-element multi-point zoom lens was used in the video camera system as early as the 1990s, but its optical performance index is low, and the variable magnification The ratio is less than 10, and the longest focal length is about 50-60mm; no ultra-low dispersion glass is used in the optical path, and the resolution of the lens is relatively low, which can only be adapted to CCD or CMOS cameras with 20-30 pixels, and does not have a wide spectral range For chromatic aberration correction, the lens adapts to a narrow spectral range and can only be used under daylight conditions of 480nm to 650nm

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