CN201041588Y

CN201041588Y - A compound layer infrared thin film optical lens

Info

Publication number: CN201041588Y
Application number: CNU2006200989683U
Authority: CN
Inventors: 陈清明
Original assignee: WUHAN FUTAILAI PHOTOELECTRIC DEVICE CO Ltd
Current assignee: Wuhan Furen photoelectric Co.,Ltd.; Wuhan Zhong Hao photoelectric Co.,Ltd.
Priority date: 2006-09-14
Filing date: 2006-09-14
Publication date: 2008-03-26
Anticipated expiration: 2016-09-14

Abstract

The utility model relates to an optical lens of a composite layer infrared thin film, and belongs to the optics technical field. The utility model aims at providing a composite infrared thin film which is combined by various materials, the combination of the composite infrared thin film and substrate is firm and the service life is long. The utility model adopts a full-penetration thin film with a composite layer to be laid out on the optical lens base material, the full-penetration thin film with the composite layer is six layers of full-penetration thin films formed by compounding the four kinds of thin film materials of MgO, ZnS, Ge, and YbF3, and the six layers of full-penetration thin films of the MgO, the ZnS, the Ge, the ZnS, the YbF3 and the ZnS, are compounded on the substrate in sequence. The lens transmittance of the utility model is up to 100 percent within the wave length range of 3 to 5 micron and 8 to 14 micron, and the service life is long.

Description

The optical lens of the infrared film of a kind of composite bed

Technical field

The utility model belongs to optical technical field, and the infrared film of arranging multiplayer on optical lens specifically is to improve the performance of infrared film.

Background technology

Before the utility model proposes, infrared film is widespread use in many fields such as industry, medical treatment and military affairs.One of modal application is exactly to be used for thermal infrared imager.The camera lens matrix material that is used for thermal infrared imager at present has Si, Ge, ZnS, ZnSe, GaAs or the like, and that wherein cost is minimum is Ge.Thereby, must plate infrared full impregnated film (being that transmitance is near 100%) in the scope of wavelength ratio broad on two surfaces of camera lens for the sensitivity that the transmitance that improves camera lens improves thermal infrared imager.Optical theory and practice all show, infrared optical thin film generally is deposited on the infrared matrix material through the mode of vacuum coating by two or more the infrared membraneous material with different refractivity and prepares.Therefore infrared lens exists the combinatorial problem of matrix material and two or more membraneous material.Present infrared film is because problems such as the combination of membraneous material and coating techniques, and the ubiquity film comes off easily, serviceable life short, film transmitance and 100% requirement differ bigger problem.

The utility model content

At the shortcoming that original infrared film exists, the purpose of this utility model provides the compound infrared film of multiple combination of materials.The combining firmly of this film and matrix, long service life, transmitance in desired wavelength coverage near 100%.

To achieve these goals, the utility model has adopted on the optical lens base material, is furnished with the full impregnated film of composite bed, and the full impregnated film of this composite bed is by MgO, ZnS, 6 layers of compound full impregnated film of four kinds of membraneous materials of Ge, YbF3.

The optical lens of the infrared film of composite bed described in the utility model, be compound successively on its base material be MgO, ZnS, Ge, ZnS, YbF3, ZnS, 6 layers of full impregnated film.

Superiority of the present utility model proves by experiment: by MgO, ZnS, Ge, YbF ₃Compound full impregnated film and the matrix bond of four kinds of membraneous materials is firm, difficult drop-off, and more weight is its lens transmission efficiency at desired wavelength 3-5 μ m and 8-14 mu m range near 100%, and long service life.

Description of drawings

Fig. 1 is the structural representation of the infrared full impregnated Film Optics of composite bed camera lens.

Basic structure such as Fig. 1. Two surfaces of general camera lens take the full impregnated film as target Film is identical, so this specification is only set forth the film on a surface. In Fig. 1, (1) Be the matrix material of infrared optics eyeglass, (2) are the MgO films of one deck low-refraction, (3) Be the ZnS film of one deck middle refractive index, (4) are the Ge films of one deck high index of refraction, (5) Be the ZnS film of one deck middle refractive index, (6) are the YbF3 films of one deck low-refraction, (7) be the ZnS film of one deck middle refractive index.

In the structure of Fig. 1, adopted altogether 6 layer films, adopted altogether MgO, ZnS, Ge, With 4 kinds of thin-film materials such as YbF3, their refractive index data have on the related optical handbook Record.

The matrix material (1) of the infrared optics eyeglass that the film of Fig. 1 structure is suitable for has following several Kind: Si or Ge or ZnS or ZnSe or GaAs etc. Select for concrete camera lens Wherein a kind of.

The number of plies of the film of Fig. 1 structure increases more than 7 layers and 7 layers as required, and the number of plies is more many Calculating and preparation are also more complicated and difficult.

Embodiment

Specific embodiment of the utility model is as follows:

The Ge eyeglass of diameter 100mm, a focal length F=100mm, requirement can be used on the thermal infrared imager of wavelength coverage 8-12 μ m, two surface needs infrared full impregnated film of plating 8-12 mum wavelength scope, promptly plate the later transmitance at 8-12 mum wavelength scope eyeglass of infrared film near 100%.Because the coating process on two surfaces is identical, so only describe the coating process and the technology on a surface here.Concrete coating process is as follows: at surface plating one deck MgO film, MgO is about 1.6 in the refractive index of 8-12 mum wavelength scope earlier, and the optical thickness of this layer film is 22.24nm; Plate one deck ZnS film again on the MgO film, ZnS is about 2.2 in the refractive index of 8-12 mum wavelength scope, and the optical thickness of this layer film is 833.2nm; Plating one deck Ge film on the ZnS film then, Ge is about 4.0 in the refractive index of 8-12 mum wavelength scope, the optical thickness of this layer film is 749.6nm; Plate one deck ZnS film again on the Ge film, the optical thickness of this layer film is 154.9nm; Plate one deck YbF3 film again on the ZnS film, YbF3 is about 1.47 in the refractive index of 8-12 mum wavelength scope, and the optical thickness of this layer film is 2065.1nm; Plating one deck ZnS film on the YbF3 film then, the optical thickness of this layer film is 212.6nm.The film on such surface just preparation finishes, and has plated 6 layer films altogether.Turn-over repeats described just now technological process again, and whole eyeglass just preparation is finished.The eyeglass that is coated with so just satisfies in the transmitance of 8-12 mum wavelength scope eyeglass near 100% technical requirement; Has film simultaneously and matrix bond is firm, many-sided advantage such as long service life.

Claims

1. the optical lens of the infrared film of composite bed is to be furnished with composite bed full impregnated film on the optical lens base material, it is characterized in that being furnished with on the optical lens base material MgO, ZnS, 6 layers of compound full impregnated film of four kinds of membraneous materials of Ge, YbF3.

2. by the optical lens of the infrared film of the described a kind of composite bed of claim 1, it is characterized in that compound successively on the base material of optical lens is MgO, ZnS, Ge, ZnS, YbF3, ZnS, 6 layers of full impregnated film.