6 results about "Zoom lens" patented technology

In this invention, to provide a compact zoom lens having a small number of optical element groups to be driven and a simple moving mechanism, at least one of a plurality of optical element groups arranged in the lens system includes a refractive power variable element of a transmission type which has a compensation function to correct focus movement caused by zooming and a focus function to correct focus movement caused by a variation in inter-object distance. The refractive power variable element is a liquid optical element including a first liquid having a conductivity or a polarity and a second liquid which is not mixed with the first liquid, the first liquid and the second liquid being enclosed in a container fluid-tight so as to define an interface therebetween having a predetermined shape, the liquid optical element being arranged such that a refractive power thereof is adjusted by changing a curvature of the interface.

The invention discloses a suspended adsorption type automatic adhering device for indicating gratings, relates to the field of a grating ruler manufacturing process, and solves the problems of poor adhesive consistency, low yield and low measurement accuracy because the three-dimensional adjustment amount of the indicating gratings, the pressing force of carriages and the contractibility of glue water cannot be accurately controlled in the manual adhering process of the indicating grating in the conventional fixed-position adhering device for the indicating gratings. The device comprises a substrate, a hollow turntable, an electric rotating platform, a grating pickup assembly, a carriage positioning assembly, an adhesive dispensing and curing assembly, a two-gear zoom lens, an adjusting seat, and a suspended adsorption structure which is fixed on a third turntable of the electric rotating platform and is used for adsorbing the indicating grating, wherein the electric rotating platform, the grating pickup assembly, the carriage positioning assembly, the adhesive dispensing and curing assembly, the two-gear zoom lens and the adjusting seat are arranged in the hollow turntable and are fixed on the substrate; the indicating grating pickup assembly and the carriage positioning assembly are respectively positioned on two sides of the electric rotating platform; a plurality of indicating gratings and a plurality of carriages are uniformly distributed on the inner and outer circumferences of the hollow turntable respectively. The adhesive accuracy, the measurement accuracy and the yield are improved through full-automatic adhesion, and the adhesive consistency is better.

A projecting zoom lens includes in order from a magnification side, a first negative group, second, third and fourth positive groups, a fifth negative group and a sixth positive group. The third group, the fourth group and the fifth group are moved along the optical axis to the magnification side during zooming from the wide-angle end to the telephoto end, and such that the projecting zoom lens satisfies given following conditional expressions.

0.9<|f1|/fw<1.7  (1)

55<νd4  (2)

An imaging apparatus includes: a zoom lens system including a plurality of groups and performing variable magnification by changing intervals of the lens groups; a color-separation optical system configured to carry out color separation of a light flux from the zoom lens system; and a plurality of imaging devices configured to convert optical images separated by colors by the color-separation optical system into electric signals. The zoom lens system includes at least one reflection member configured to bend an optical axis by 90 degrees or approximately 90 degrees. The color-separation optical system is arranged such that color-separation is performed in a direction within a plane perpendicular to another plane formed by an optical axis for light incident to the zoom lens system and an optical axis for light reflected by the reflection member.

The invention discloses a variable-focus cavity type lens based on a dielectric elastomer. The lens comprises a lens driver which consists of a first dielectric elastomer film, a second dielectric elastomer film and a flexible electrode, and the first dielectric elastomer film and the second dielectric elastomer film are fixedly pasted on an annular supporting frame. The first dielectric elastomerfilm and the second dielectric elastomer film are symmetrically arranged and attached to each other, arc-shaped grooves are formed in the first dielectric elastomer film and the second dielectric elastomer film, the two sets of arc-shaped grooves correspond to each other, a cavity is formed between the two sets of arc-shaped grooves, and the cavity is filled with transparent liquid media. Flexible electrodes are coated from the peripheries of the arc-shaped grooves of the first dielectric elastomer film and the second dielectric elastomer film to the annular part of the annular support frame.The lens is made of the dielectric elastomer film, the flexible electrode and the transparent liquid medium, wherein the zoom imaging effect can be achieved by changing the shape of the cavity of thezoom lens, and the zoom lens has the advantages of being light in structure, small in size and the like.