CN203519916U - Ultra wide angle lens - Google Patents

Abstract

The utility model discloses an ultra wide angle lens comprising a diaphragm, a lens group formed by six spherical glass lenses and a lens barrel. The lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are coaxially arranged in order from an object side to an image side. Both the first lens and the second lens are meniscus lenses which have negative focal power and project toward the object side. Both the third lens and the fourth lens are biconvex spherical lenses with positive focal power. The fifth lens and the sixth lens are bound together to be a lens element with positive focal power. The diaphragm is between the third lens and the fourth lens. The viewing angle of the ultra wide angle lens can reach a 170-degree ultra wide angle, the lens processing is easy to realize, the cost is low, and the need of lens high-definition quality can be satisfied.

Description

A kind of bugeye lens

[technical field]

The utility model relates to optical image technology field, is specifically related to a kind of bugeye lens.

[background technology]

In recent years, the use of safety monitoring equipment and vehicle-mounted camera-shooting and recording device is more and more universal, as all kinds of security monitoring cameras, automobile travel recorder, rear-view device for reverse etc., wide-angle lens is with great visual angle core component indispensable in this kind equipment, in wide-angle lens, the bugeye lens that angular field of view is wide especially can meet the demands of series products to super large visual angle such as motion DV and on-vehicle lens.The camera lens that has many employing 4G structures in prior art, structure is small and exquisite, can accomplish the wide-angle of 120 °～150 °, but is subject to the restriction of optical aberration, is difficult to accomplish 170 ° of super wide-angles; Adopt aspheric surface technology, can under equal 4G structure, make the larger wide-angle lens in visual angle, but aspherical mirror machining difficulty is large, glass aspherical mirror machining and detection technique there also are not universalization, and equipment cost is very high; Moulded plastic aspheric surface can realize scale of mass production, and cost is not high yet, but performance is affected by environment large, and working range is very undesirable at-45 ° of C～+ 75 ° C, and heat is poor large, and logical light is little, and smearing of image, can not meet the requirement of camera lens high definition quality.

[utility model content]

For above-mentioned defect, the utility model discloses a kind of bugeye lens, visual angle can reach 170 ° of super wide-angles, and machining eyeglass is easy to realize, with low cost, and can meet the requirement of camera lens high definition quality.

The technical solution of the utility model is as follows:

A bugeye lens, comprises diaphragm, the lens combination being comprised of six spherical glass lens and lens barrel; Described lens combination comprises the first to the 6th lens from object space to image space successively arranged in co-axial alignment, described first lens and the second lens are to have negative power the protruding curved month type eyeglass to object space, described the 3rd lens and the 4th lens are the biconvex spheric glass with positive light coke, and described the 5th lens and the 6th lens glue are combined into the lens element with positive light coke; Described diaphragm is between the 3rd lens and the 4th lens;

Described bugeye lens meets: D/H>1.5, and D/L>0.4 and 2.0<BF/F<2.4, the effective aperture value that wherein D is first lens, H is image planes sizes, L is the optics overall length of bugeye lens, BF is that the minute surface central point of the 6th lens image space one side is to the distance of image planes, the focal length that F is camera lens.

In the lens combination of bugeye lens of the present utility model, all eyeglasses all adopt spherical glass eyeglass, and the process technology of spherical glass eyeglass is ripe, and technique is universal, with low cost; Meanwhile, the logical optical property of glass material is stronger than plastic material, has guaranteed high resolving power, and the operating temperature range wider than the eyeglass of plastic material is provided simultaneously; The satisfied condition of bugeye lens makes bugeye lens can reach the visual angle higher than 170 °.

[accompanying drawing explanation]

Fig. 1 is the structural representation of the utility model embodiment.

[embodiment]

Below in conjunction with accompanying drawing, the embodiment of utility model is elaborated.

As shown in Figure 1, bugeye lens of the present utility model comprises diaphragm 9, the lens combination being comprised of six spherical glass lens and lens barrel; Described lens combination comprises the first to the 6th lens from object space to image space 8 successively arranged in co-axial alignment, described first lens 1 and the second lens 2 are for having negative power the protruding curved month type eyeglass to object space, described the 3rd lens 3 and the 4th lens 4 are for having the biconvex spheric glass of positive light coke, and described the 5th lens 5 and the 6th lens 6 gummeds form the lens element with positive light coke; Described diaphragm 9 is between the 3rd lens and the 4th lens;

Described bugeye lens meets:

D/H>1.5，

And D/L>0.4,

And 2.0<BF/F<2.4,

Wherein: the effective aperture value that D is first lens, H is image planes sizes, the optics overall length that L is bugeye lens, BF is that the minute surface central point of the 6th lens image space one side is to the distance of image planes, the focal length that F is camera lens.

In the lens combination of bugeye lens of the present utility model, all eyeglasses all adopt spherical glass eyeglass, and the process technology of spherical glass eyeglass is ripe, and technique is universal, with low cost; Meanwhile, the logical optical property of glass material is stronger than plastic material, has guaranteed high resolving power, and the operating temperature range wider than the eyeglass of plastic material is provided simultaneously;

The condition D/H>1.5 that bugeye lens is satisfied,

And D/L>0.4,

And 2.0<BF/F<2.4,

Wherein: the effective aperture value that D is first lens, H is image planes sizes, the optics overall length that L is bugeye lens, and BF is that the minute surface central point of the 6th lens image space one side is to the distance of image planes, F is the focal length value of camera lens, makes bugeye lens of the present utility model reach 170 ° of super wide-angles.

Preferably, described the 6th lens 6 be below also provided with infrared fileter 7, for eliminating the impact of infrared aberration, lenses is played a protective role simultaneously;

Further, described first lens 1 is selected the chromatic dispersion material that refractive index is high, its refractive index N1 >=1.7, and dispersion V1 >=50, convex surface is towards object plane; The second lens 2 are selected the chromatic dispersion material that refractive index is high, its refractive index N2 >=1.7, and dispersion V2 >=50, convex surface is towards object plane; The 3rd lens 3 are selected high-refractivity and low-dispersion material, its refractive index N3 >=1.74, dispersion V3≤30, the 3rd lens 3 can produce a certain amount of positive curvature of field, offset the negative curvature of field of first lens 1 and the second lens 2 above, can increase the emergence angle of light, reduce to the distance of diaphragm, the length of reduction system; The 4th lens 4 are selected high chromatic dispersion material, its refractive index N4 < 1.65, abbe number V4 >=55; The 5th lens 5 are selected high chromatic dispersion material, its refractive index N5 < 1.6, abbe number V5≤65; The 6th lens 6 are selected high-refractivity and low-dispersion material, its refractive index N6 >=1.70, abbe number V6≤35; The 4th lens 4 and the gummed eyeglass being combined into by the 5th lens 6 and the 6th lens 6 produce the positive curvature of field and a certain amount of positive astigmatism;

Further, in concrete enforcement, as a preferred embodiment, the refractive index N1=1.739 of described first lens 1, abbe number V1=56.7; The refractive index N2=1.713 of the second lens 2, V2=51.8; The refractive index N3=1.79 of the 3rd lens 3, abbe number V3=27.5; The refractive index N4=1.603 of the 4th lens 4, abbe number V4=60.6; The refractive index N5=1.589 of the 5th lens 5, abbe number V4=61.4; The refractive index N6=1.765 of the 6th lens 6, abbe number V6=27.5;

Further, the center thickness 1mm>D1>0.6m of described first lens 1, focal distance f 1 >=-9.5mm; The center thickness 1mm>D2>0.5mm of the second lens 2, focal distance f 2 >=-4.7mm; The center thickness 4.5mm>D3>3.5mm of the 3rd lens 3, focal distance f 3≤9.4mm; The center thickness 1.8mm>D4>1.2mm of the 4th lens 4, focal distance f 4≤6.7mm; The center thickness 2mm>D5>1.5mm of the 5th lens 5, focal distance f 5≤4.4mm; The center thickness 2mm>D6>1.5mm of the 6th lens 6, focal distance f 6≤5.8mm;

Focal distance f 56≤the 32mm of the lens element that further, described the 5th lens 5 and the 6th lens 6 gummeds form;

Further, the spacing 2.5mm<D12<3mm of described first lens 1 and the second lens 2; The spacing 1mm<D23<1.8mm of the second lens 2 and the 3rd lens 3; The spacing 1.5mm<D30<1.9mm of the 3rd lens 3 and diaphragm 9; The spacing 0mm<D04<0.5mm of diaphragm 9 and the 4th lens 4; The spacing 0mm<D45<0.2mm of the 4th lens 4 and the 5th lens 5.

For example, in concrete enforcement, a preferred configuration of bugeye lens of the present utility model is as shown in table 1:

Front surface described in table 1 refers to that lens are near the surface of object space, and the rear surface described in table 1 refers to that lens are near the surface of image space, when the radius on the first to the 6th lens, diaphragm and infrared fileter surface is ∞ in table 1, represents that this surface is for plane;

Table 1

Preferably, described diaphragm 9 is one-body molded with the lens barrel of bugeye lens, to reduce due to the improper error causing of diaphragm 9 assembling.

Above-described the utility model embodiment, does not form the restriction to the utility model protection domain.Any modification of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in claim protection domain of the present utility model.

Claims (8)

1. a bugeye lens, it is characterized in that: comprise diaphragm, the lens combination being formed by six spherical glass lens and lens barrel, described lens combination comprises the first to the 6th lens from object space to image space successively arranged in co-axial alignment, described first lens and the second lens are to have negative power the protruding curved month type eyeglass to object space, described the 3rd lens and the 4th lens are the biconvex spheric glass with positive light coke, and described the 5th lens and the 6th lens glue are combined into the lens element with positive light coke; Described diaphragm is between the 3rd lens and the 4th lens;

Described bugeye lens meets: D/H>1.5, and D/L>0.4 and 2.0<BF/F<2.4, the effective aperture value that wherein D is first lens, H is image planes sizes, L is the optics overall length of bugeye lens, BF is that the minute surface central point of the 6th lens image space one side is to the distance of image planes, the focal length that F is bugeye lens.

2. bugeye lens as claimed in claim 1, is characterized in that: also comprise infrared fileter, described infrared fileter be located at the 6th lens after.

3. bugeye lens as claimed in claim 1 or 2, is characterized in that: refractive index N1 >=1.7 of described first lens, abbe number V1 >=50; Refractive index N2 >=1.7 of the second lens, V2 >=50; Refractive index N3 >=1.74 of the 3rd lens, abbe number V3≤30; The refractive index N4 < 1.65 of the 4th lens, abbe number V4 >=55; The refractive index N5 < 1.6 of the 5th lens, abbe number V5≤65; Refractive index N6 >=1.70 of the 6th lens, abbe number V6≤35.

4. bugeye lens as claimed in claim 3, is characterized in that: the refractive index N1=1.739 of described first lens, abbe number V1=56.7; The refractive index N2=1.713 of the second lens, V2=51.8; The refractive index N3=1.79 of the 3rd lens, abbe number V3=27.5; The refractive index N4=1.603 of the 4th lens, abbe number V4=60.6; The refractive index N5=1.589 of the 5th lens, abbe number V4=61.4; The refractive index N6=1.765 of the 6th lens, abbe number V6=27.5.

5. bugeye lens as claimed in claim 3, is characterized in that: the center thickness 1mm>D1>0.6m of described first lens, focal distance f 1 >=-9.5mm; The center thickness 1mm>D2>0.5mm of the second lens, focal distance f 2 >=-4.7mm; The center thickness 4.5mm>D3>3.5mm of the 3rd lens, focal distance f 3≤9.4mm; The center thickness 1.8mm>D4>1.2mm of the 4th lens, focal distance f 4≤6.7mm; The center thickness 2mm>D5>1.5mm of the 5th lens, focal distance f 5≤4.4mm; The center thickness 2mm>D6>1.5mm of the 6th lens, focal distance f 6≤5.8mm.

6. bugeye lens as claimed in claim 5, is characterized in that: the focal distance f 56≤32mm of the lens element that described the 5th lens and the 6th lens glue are combined into.

7. bugeye lens as claimed in claim 5, is characterized in that: the spacing 2.5mm<D12<3mm of described first lens and the second lens; The spacing 1mm<D23<1.8mm of the second lens and the 3rd lens; The spacing 1.5mm<D30<1.9mm of the 3rd lens and diaphragm; The spacing 0mm<D04<0.5mm of diaphragm and the 4th lens; The spacing 0mm<D45<0.2mm of the 4th lens and the 5th lens.

8. bugeye lens as claimed in claim 1 or 2, is characterized in that: the lens barrel of described diaphragm and bugeye lens is one-body molded.

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