A continuous zoom optical device

Abstract

The invention discloses a continuous zoom optical device which comprises a compensation group, a zooming group, a variable diaphragm group, a focusing group, a rear fixation group and an image plane. The compensating group moves in the direction of the optical axis O-O, and is composed of two double glued lenses. The zooming group moves in the direction of the optical axis O-O, and is composed of a double glued lens and a negative meniscus lens. The variable diaphragm group moves perpendicular to the optical axis O-O. The focusing group moves in the direction of the optical axis O-O, and is composed of two biconvex lenses and a double glued lens. The rear fixation group is fixed on the optical axis O-O, and is composed of a biconvex lens and two double glued lenses. According to the invention, the total length is variable, and a compensation curve is an irregular curve shaped like a parabola. Under the same relative aperture condition, the continuous zoom optical device has the advantages that the optical aperture is reduced by 30% and the entrance pupil distance is reduced by 25.7 % compared with an optical device with invariable total length.

Description

technical field [0001] The invention belongs to the technical field of optical systems, and in particular relates to a continuous zoom optical device with a small aperture and a large amount of light, which is suitable for concealed observation of a target in a periscope state. Background technique [0002] In the periscope state, in order to observe the target on the water surface that requires a field of view and operating distance, and at the same time have good concealment, it is required that the part of the observation equipment exposed to the water surface should be as small as possible. figure 1 The schematic diagram of the structure of the existing periscope equipment is shown, that is, when the size of the protective glass is fixed, to meet the requirements of the field of view and the operating distance, the aperture of the light must be reduced as much as possible under the premise of ensuring that the relative aperture of the optical device remains unchanged and...

AI Technical Summary

Problems solved by technology

[0005] like Figure 4 As shown, if the iris diaphragm is placed between the front fixed group and the variable magnification group, the distance between the aperture of the first surface and the entrance pupil of the optical device is the smallest, but the apertures of the compensation group and the rear fixed group increase rapidly. Large, resulting in increased volume and weight of the optical device, which is not conducive to miniaturization design

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