TEN-FOLD ULTRA-COMPACT VARIFOCAL LENS WITH MACRO-MODE Russian patent published in 2011 - IPC G02B15/16 G02B15/22 

FIELD: physics.

SUBSTANCE: objective lens consists of four series-arranged components: the first is convergent, the second is divergent and third and fourth are convergent. The first component is immovable in zooming mode and is movable in macro-mode and consists of a converging and a diverging lens glued together. The second component is movable and contains a biconcave lens and consists of a converging and a diverging lens glued together. A shutter with an aperture diaphragm, having two fixed openings, lies between the second and third components and can move together with the third component. The distance from the centre of the shutter to the CCD matrix lies in the range of 0.42…0.50 times the total length of the objective lens. The third component is movable and consists of a converging and a diverging lens glued together and a divergent-meniscus lens. The fourth component is movable and consists of a divergent- and a convergent-meniscus lens and a converging lens.

EFFECT: fewer number of lenses and aspherical surfaces while maintaining or improving functionalities of the objective lens.

3 cl, 9 dwg, 3 tbl