CN202546603U

CN202546603U - Zoom lens

Info

Publication number: CN202546603U
Application number: CN201220012628XU
Authority: CN
Inventors: 岑亮; 刘振
Original assignee: Shenzhen Langheng Electronic Co Ltd
Current assignee: Shenzhen langheng Lighting Technology Co.,Ltd.
Priority date: 2012-01-12
Filing date: 2012-01-12
Publication date: 2012-11-21
Anticipated expiration: 2022-01-12

Abstract

The utility model discloses a zoom lens. The zoom lens comprises a lens body (1) and a Fresnel lens (15) arranged on the upper surface of the lens body (1), wherein the lens boy (1) comprises an accommodating space (10) for placing an LED (Light Emitting Diode) light source, a first optical aspheric surface (11), a second optical aspheric surface (12), a third optical aspheric surface (13), a fourth optical aspheric surface (14); the first optical aspheric surface (11) is arranged on the outer surface of the lens body (1); the second optical aspheric surface (12) is arranged on the top convex part of the lens body (1); the third optical aspheric surface (13) is arranged on the bottom concave part of the lens body (1); the concave part is communicated with the accommodating space (10); and the fourth optical aspheric surface (14) is arranged on the side surface of the lens body (1). The plurality of optical aspheric surfaces are combined with the position of the Fresnel lens, and the LED light source is moved forwards and backwards, so as to achieve a light focusing effect and a light dispersion effect, thereby greatly avoiding an image forming problem and effectively improving the efficiency of the lens.

Description

A kind of zoom lens

Technical field

The utility model relates to lighting field, relates in particular to a kind of zoom lens that are used for torch.

Background technology

Along with constantly popularizing of torch lens, generally speaking, the light shape of a torch has only a kind of; The user often needs different light shapes under different environment, for example floodlight and optically focused or the like cooperate with the lens of one piece of plano-convex and zoom torch lens in the market are most of; Distance through moving light source realizes zoom; As shown in Figure 1, but this zoom torch lens have following defective: 1, varifocal is from long, reach gather, the distance of floodlight point needs is longer; Operate the inconvenience of rising in rebellion, and increased the length of flashlight; 2, luminous energy inefficiency, lens adopt common plano-convex structural design, still are that the floodlight state all has very big a part of luminous energy to lose in vain in spot condition.

The utility model content

The technical problem that the utility model will solve is; Leave the long and inefficient defective of luminous energy to the prior art varifocal; A kind of zoom lens are provided; This technical scheme can have been avoided imaging problem to greatest extent in short varifocal from interior realization spotlight effect and floodlight effect, has effectively improved lens efficiency.

The utility model solves the technical scheme that its technical problem adopted: construct a kind of zoom lens; Comprise lens body (1); It comprises one be used to place led light source accommodation space (10), first optical aspherical surface (11), second optical aspherical surface (12), the 3rd optical aspherical surface (13), the 4th optical aspherical surface (14) and be provided with Fresnel Lenses (15) in lens body (1) upper surface; Wherein, First optical aspherical surface (11) is positioned at lens body (1) outer surface, and second optical aspherical surface (12) is positioned at lens body (1) top protuberance, and the 3rd optical aspherical surface (13) is positioned at lens body (1) bottom recess; This recess communicates with accommodation space (10), and the 4th optical aspherical surface (14) is positioned at lens body (1) side.

In the described zoom lens of the utility model, the focus of the focus of second optical aspherical surface (12) and the 3rd optical aspherical surface (13) all is positioned at the center of lens body (1) bottom.

In the described zoom lens of the utility model, said zoom lens are zoom torch lens.

Implement the technical scheme of the utility model; Has following beneficial effect: through a plurality of optical aspherical surfaces and the locational combination of Fresnel Lenses; And move forward and backward led light source realization spotlight effect and floodlight effect, and avoided imaging problem to greatest extent, effectively improved lens efficiency.

Description of drawings

To combine accompanying drawing and embodiment that the utility model is described further below, in the accompanying drawing:

Fig. 1 is the structural representation of prior art zoom torch lens light gathering state;

Fig. 2 is the structural representation of the utility model zoom lens;

Fig. 3 is the structural representation of the utility model zoom lens spot condition;

Fig. 4 is the distribution curve flux figure of the utility model zoom lens spot condition;

Fig. 5 is the structural representation of the utility model zoom lens floodlight state;

Fig. 6 is the distribution curve flux figure of the utility model zoom lens floodlight state.

The specific embodiment

For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.

See also Fig. 2, Fig. 2 is the structural representation of the utility model zoom lens, and is as shown in Figure 2; These zoom lens comprise lens body 1, and wherein, lens body 1 comprises an accommodation space 10, first optical aspherical surface 11, second optical aspherical surface 12, the 3rd optical aspherical surface 13, the 4th optical aspherical surface 14 and is provided with Fresnel Lenses 15 in lens body 1 upper surface; Wherein, accommodation space 10 is used to place led light source, what deserves to be mentioned is; These accommodation space 10 bottoms are equal with lens body 1 bottom; First optical aspherical surface 11 is positioned at lens body 1 outer surface, and second optical aspherical surface 12 is positioned at lens body 1 top protuberance, and the 3rd optical aspherical surface 13 is positioned at lens body 1 bottom recess; This recess communicates with accommodation space 10, and the 4th optical aspherical surface 14 is positioned at lens body 1 side.In the present embodiment, the focus of the focus of second optical aspherical surface 12 and the 3rd optical aspherical surface 13 all is positioned at the center of lens body 1 bottom.Should be noted that led light source reaches spotlight effect when being positioned at the center of lens body 1 bottom, in addition, can reach the floodlight effect according to user's moving forward and backward of led light source of demand control, those skilled in the art should understand, and repeats no more here.

The effect of specifically introducing each several part below in conjunction with the spot condition and the floodlight state of zoom lens.

Please combine to consult Fig. 3, Fig. 3 is the structural representation of the utility model zoom lens spot condition, and is as shown in Figure 3; Under spot condition, A is a led light source, and light sends from led light source; More light refraction is after by 11 reflections of first optical aspherical surface; Light after the 4th optical aspherical surface 14 will be launched reflects, and the purpose of doing like this is: the one, weaken lens imaging, and the 2nd, utilize lens to follow the different of incidence angle and refraction angle between two kinds of different mediums of air; The final angle of emergence of light is reduced as far as possible, to strengthen the optically focused performance.In addition, Fresnel Lenses 15 is mainly used in the loosing of light to edge, thereby avoids the generation that forms images.In the present embodiment, first optical aspherical surface 11 is used for the light of led light source is converged in the center spot place, thereby strengthens the optically focused performance; Second optical aspherical surface 12 and the 3rd optical aspherical surface 13 are with the parallel as far as possible ejaculation of light, and 14 pairs of the 4th optical aspherical surfaces avoid lens imaging to help out.This zoom lens spot condition distribution curve flux is as shown in Figure 4.

Please combine to consult Fig. 5, Fig. 5 is the structural representation of the utility model zoom lens floodlight state, and is as shown in Figure 5; Under the floodlight state, A is a led light source, and first optical aspherical surface 11 mainly effectively reflects the light of led light source side edge; Thereby strengthened the utilization rate of lens; Second optical aspherical surface 12 and the 3rd optical aspherical surface 13 mainly carry out uniform scattering to the light of led light source, and dead line is clearly arranged, and this zoom lens floodlight floodlight state distribution curve flux is as shown in Figure 6.

Preferably, these zoom lens are zoom torch lens.Should be noted that these zoom lens can be applicable in other illuminations, those skilled in the art should understand, and repeats no more here.

Compared to prior art, through a plurality of optical aspherical surfaces and the locational combination of Fresnel Lenses, and move forward and backward led light source realization spotlight effect and floodlight effect, avoided imaging problem to greatest extent, effectively improved lens efficiency.

The preferred embodiment that the above is merely the utility model is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the utility model.

Claims

1. zoom lens; It is characterized in that, comprise lens body (1), it comprise one be used to place led light source accommodation space (10), first optical aspherical surface (11), second optical aspherical surface (12), the 3rd optical aspherical surface (13), the 4th optical aspherical surface (14) and be provided with Fresnel Lenses (15) in lens body (1) upper surface; Wherein, First optical aspherical surface (11) is positioned at lens body (1) outer surface, and second optical aspherical surface (12) is positioned at lens body (1) top protuberance, and the 3rd optical aspherical surface (13) is positioned at lens body (1) bottom recess; This recess communicates with accommodation space (10), and the 4th optical aspherical surface (14) is positioned at lens body (1) side.

2. zoom lens according to claim 1 is characterized in that, the focus of the focus of second optical aspherical surface (12) and the 3rd optical aspherical surface (13) all is positioned at the center of lens body (1) bottom.

3. zoom lens according to claim 1 and 2 is characterized in that, said zoom lens are zoom torch lens.