CN205899117U - Mixed structure's optical devices is moulded to glass - Google Patents

Abstract

The utility model discloses a mixed structure's optical devices is moulded to glass, this device include the unsmooth negative optical power's that sets gradually along the light incidence orientation a glass spherical lens L1, biconvex positive refractive power's the 2nd glass spherical lens L2, biconvex positive refractive power's the non - spherical lens L3 of third plastic, biconcave negative optical power's the non - spherical lens L4 of fourth plastic, convex -concave positive refractive power's the non - spherical lens L5 of the 5th plastic, this camera lens adopts 2G3P's structure, and the full glass lens who compares all specifications of the same race structurally will lack one piece of lens to the structure has been simplified. And compact through reasonable distribution focal power messenger lens structure, and then the tolerance susceptibility has been reduced by a wide margin to reasonable adoption plastic aspherical mirror piece makes the various phases difference obtain fine correction, has promoted the image quality greatly, can satisfy the 3Mega high definition completely like matter.

Description

A kind of glass moulds the Optical devices of mixed structure

Technical field

The utility model design mainly for safety monitoring day and night and ensures the light in -30 DEG C～70 DEG C not out of focus Learn device.

Background technology

Closed-circuit control industry (cctv) domestic at present all towards miniaturization, multi-functional, the direction of strong environmental adaptability Development, and under the very fierce form of domestic compentition, day and night tight shot can not meet different geographical client's Demand, what the market in such as China northeast required to design be placed in outdoor and not out of focus throughout the year supervising device, I State northeast and also can reach 31 DEG C about to summer highest in winter temperature often at subzero 30 DEG C.As considered further that monitoring camera The circuit heating factor of machine, designs a day and night and can not offset to obtain optical imaging device by focal plane in -30 DEG C～70 DEG C Just very necessary.Because the camera lens of two kinds of specifications of market 4mm, 6mm is very universal, so the design have chosen 8mm Jiao The blank to fill up this focal length end for the specification away from, f/no1.8.

Utility model content

The utility model design mainly for safety monitoring day and night and ensures the light in -30 DEG C～70 DEG C not out of focus Learn device.

For reaching above design requirement, the technical scheme that the utility model provides is as follows:

A kind of glass moulds the Optical devices of mixed structure it is characterised in that described Optical devices are included along light incident direction First glass spherical lens l1 of the concavo-convex negative power setting gradually, the second glass spherical lens l2 of biconvex positive light coke, 3rd plastic aspheric lenes l3 of biconvex positive light coke, the 4th plastic aspheric lenes l4 of concave-concave negative power, convex-concave are just 5th plastic aspheric lenes l5 of focal power；Wherein, described 3rd plastic aspheric lenes l3, the 4th plastic aspheric lenes The focal length of l4 and the 5th plastic aspheric lenes l5 meets following condition:

$-32.66\≤\frac{f_3*f_5}{f_4}\≤-29.55;$

Wherein, f₃, f₄, f₅Focal length value for non-spherical lens l3, l4, l5.

Effectively ensure the utility model can in -30 DEG C～70 DEG C of temperature change not out of focus, and infrared confocal.And Reasonably can be very good to lift edge image quality the image quality it is ensured that very high using plastic cement is aspherical.

Brief description

Fig. 1 is lens assembling figure of the present utility model.

Fig. 2 is Optical devices figure of the present utility model.

Fig. 3 is that wavelength vs of the present utility model is burnt moves figure.

Fig. 4 is 20 DEG C of mtf curve maps of the utility model normal temperature.

Fig. 5 is -30 DEG C of mtf curve maps of the utility model low temperature.

Fig. 6 is 70 DEG C of mtf curve maps of the utility model high temperature.

Specific embodiment

Further illustrate the technical solution of the utility model below in conjunction with the accompanying drawings and by specific embodiment.Can manage Solution, specific embodiment described herein is used only for explaining the utility model, rather than to restriction of the present utility model.Separately Outer also, it should be noted for the ease of description, illustrate only the part related to the utility model in accompanying drawing and not all interior Hold.See Fig. 1 and Fig. 2, the utility model includes the first glass marble of concavo-convex negative power setting gradually along light incident direction Face lens l1, the second glass spherical lens l2 of biconvex positive light coke, the 3rd plastic aspheric lenes l3 of biconvex positive light coke, 4th plastic aspheric lenes l4 of concave-concave negative power, the 5th plastic aspheric lenes l5 of convex-concave positive light coke；Wherein, institute State lens l1 and comprise relative r1 face and r2 face, described lens l2 comprises relative r3 face and r4 face, described lens l3 comprises phase To r5 face and r6 face, described lens l4 comprises relative r7 face and r8 face, and described lens l5 comprises relative r9 face and r10 Face.A kind of focal length is that the 2g3p glass of 8mm moulds mixed structure and infrared and Optical devices that high/low temperature is confocal are it is characterised in that include First glass spherical lens l1 of the concavo-convex negative power setting gradually along light incident direction, the second glass of biconvex positive light coke Glass spherical lens l2, the 3rd plastic aspheric lenes l3 of biconvex positive light coke, concave-concave negative power the 4th plastic cement aspherical Lens l4, the 5th plastic aspheric lenes l5 of convex-concave positive light coke；The focal length of five lens of this device, refractive index and two pieces The radius of curvature of glass lens meets following condition respectively:

Table 1

In upper table: " f " is refractive index, " n " is refractive index, and " r " is radius of curvature, and bottom right mark " 1,2,3.. " corresponds to lens " l1, l2, l3... ", "-" represents that direction is negative direction.

The aspherical equation that non-spherical lens l3, l4, l5 meet is:

$z=\frac{{\mathrm{cy}}^2}{1+\sqrt{1-(1+{\mathrm{kc}}^2{y}^2)}}+{\mathrm{\α}}_4{y}^4+{\mathrm{\α}}_6{y}^6+{\mathrm{\α}}_8{y}^8+{\mathrm{\α}}_{10}{y}^{10}$

In above formula, parameter c is the curvature corresponding to radius, and y is radial coordinate (its unit is identical with length of lens unit), K is circular cone whose conic coefficient.

The corresponding aspherical parameter of non-spherical lens l3, l4, l5 see table:

Table 2

More than synthesis, the axial distance that this Optical devices must also meet lens l1 and l2 is 3.5mm, lens l2 and l3 The axial distance for 0.11mm, lens l3 and l4 for the axial distance is the axial distance of 0.078mm, lens l4 and l5 is 0.94mm.

In this main focal length passing through control 3 pieces of plastic aspheric lenes, the focal length of two pieces of positive lens is long-pending negative divided by one piece The value of the focal length of lens.

I.e.

$-32.66\≤\frac{f_3*f_5}{f_4}\≤-29.55;$

Wherein, f₃, f₄, f₅It is shown in Table 1

Implement design one

Radius of curvature, thickness difference when the focal length, refractive index and two pieces of glass lens of five lens of this utility model When meeting table 1 below and table 2 condition, meet simultaneously lens l1 and l2 axial distance be 3.5mm, lens l2 and l3 axial away from From the axial distance for 0.11mm, lens l3 and l4 be 0.078mm, lens l4 and l5 axial distance for 0.94mm when, wavelength Vs is burnt to be moved it is seen that the infrared defocusing amount that can ensure that ± 75um, and this has fully met infrared confocal design requirement.

Implement design two

Radius of curvature, thickness difference when the focal length, refractive index and two pieces of glass lens of five lens of this utility model When meeting table 1 below condition, be can be seen that by Fig. 4, Fig. 5, Fig. 6 be originally located at 20 degrees Celsius of normal temperature, subzero 30 DEG C of low temperature, above freezing 70 Under the maximum conditions such as DEG C high temperature, all serious out of focus phenomenon in the mtf curve of actual measurement.

These are only preferred embodiment of the present utility model, not in order to limit the utility model, all in the utility model Spirit and principle within, any modification, equivalent substitution and improvement made etc., should be included in protection model of the present utility model Within enclosing.

Claims (3)

1. a kind of glass mould mixed structure Optical devices it is characterised in that described Optical devices include along light incident direction according to First glass spherical lens l1 of the concavo-convex negative power of secondary setting, the second glass spherical lens l2 of biconvex positive light coke, double 3rd plastic aspheric lenes l3 of convex positive light coke, the 4th plastic aspheric lenes l4 of concave-concave negative power, the positive light of convex-concave 5th plastic aspheric lenes l5 of focal power；Wherein, described 3rd plastic aspheric lenes l3, the 4th plastic aspheric lenes l4 Meet following condition with the focal length of the 5th plastic aspheric lenes l5:

Wherein, f₃, f₄, f₅Focal length value for non-spherical lens l3, l4, l5.

2. Optical devices as claimed in claim 1 it is characterised in that: described Optical devices also comprise a device diaphragm, described Device diaphragm is located between lens l1 and l2.

3. Optical devices as claimed in claim 1 it is characterised in that: the axial direction of the described lens l1 and l2 of described Optical devices Distance is 3.5mm, and the axial distance of described lens l2 and l3 is 0.11mm, and the axial distance of described lens l3 and l4 is The axial distance of 0.078mm, described lens l4 and l5 is 0.94mm.