CN2138304Y

CN2138304Y - Vari-focal lens

Info

Publication number: CN2138304Y
Application number: CN 92238059
Authority: CN
Inventors: 刘广言
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-10-16
Filing date: 1992-10-16
Publication date: 1993-07-14
Anticipated expiration: 2002-10-16

Abstract

The utility model discloses a multifocal lens for experimental classes in middle and elementary schools, which can change the problem that shaped model lens lacks of third dimension. The two sides of a shell lens are provided with transparent films, and a shell and an injector or an air cylinder are intercommunicated. Liquid or gas can be injected in the shell, and a switch is arranged on a communicating pipe in order to control filling. The amount of the filling can be composed of convex lenses or concave mirrors of different focal length, which reaches the multifocal lens.

Description

Vari-focal lens

The utility model relates to a kind of zoom lens that change focal length, can be for the usefulness on primary and secondary students' laboratory.

Lens are critical elements of optical instruments such as glasses, magnifier, microscope and telescope, and its performance is all relevant with the focal length of lens; People's eyes also are a kind of zoom systems of exquisiteness, and the variation by focal length (by the variation of the degree of crook that changes lens surface) can be seen Qingyuan City, near objects; And at present, the experiment of the relevant lens of primary school can only explain with setting model or wall chart, lacks the sense of reality, can not give more deep impression of student.

The purpose of this utility model is to overcome above-mentioned shortcoming part of the prior art, and a kind of zoom lens of adjustable focal length are provided, and the usefulness for primary and secondary students' experiment makes the student more deep to the understanding of lens.

The purpose of this utility model can reach by following technology: lens are housing, and the housing two sides are hyaline membrane, and housing is communicated with syringe or inflator, and switch was arranged on communicating pipe.

Said lens can be the drum type housing, filled water or air in the housing.

The utility model is compared above-mentioned prior art and had following effect: this focal length of lens F can be between 50 to-75 changes arbitrarily, can accomplish the many usefulness of a mirror, during decapacitation is carried out at present, outside primary school's lens experiment, can also carry out the experiments such as adjusting of eyes; When injecting water in the housing, can do convex lens convergence, concavees lens disperse experiment; When injecting air in the housing, can convex lens disperse, the convergence experiment of concavees lens, can also observe the light path of rays pass through lens simultaneously; Can improve teaching efficiency, reach theoretical with actual combining.

Fig. 1 is the utility model diagrammatic sketch;

Fig. 2 is an A-A cut-open view on Fig. 1.

Below in conjunction with accompanying drawing will the utility model is described in further detail:

By Fig. 1, shown in 2, can use transparent membrane 2 bonding or tight in the ring body both sides by getting annular casing 1 on the beverage can with elastic rope.The connection joint 3 that is connected with communicating pipe 4 is arranged on the ring body, communicating pipes 4 other end be connected with syringe or inflator 6, switch 5 was arranged on communicating pipe 4.

Above-mentioned communicating pipe 4 can be adopted flexible rubber hose, and switch can replace with general clip.When in annular casing, injecting water, can inject, can inject with inflator during injecting gas with syringe; What of injection rate IR can form protruding, concavees lens according to, its focal length can be changed by injection rate IR, realizes zoom lens, for the usefulness that can do the zoom lens experiment on primary and secondary students' laboratory.Also has inserted link joint 7 in addition on the ring body.

Claims

1, in a kind of confession, the zoom lens of primary school's experiment usefulness, its feature: lens are housing 1, the housing two sides are hyaline membrane 2, and housing is communicated with syringe or inflator 6, and switch 5 was arranged on communicating pipe 4.

2, zoom lens as claimed in claim 1, its feature: lens can be the drum type housing, can inject liquid or gas in the housing.