阅读说明：本技术 一种迷你型3.6mm日夜两用高清定焦镜头 (Miniature 3.6mm dual-purpose high definition tight shot of day night ) 是由 杨樟洪 陈嘉旺 冯科 张世忠 于 2019-10-16 设计创作，主要内容包括：本发明涉及一种迷你型3.6mm日夜两用高清定焦镜头,包括主镜筒,所述主镜筒内沿光线入射方向自左向右依次设置有前组镜片、光阑和后组镜片,所述前组镜片为双凹透镜,所述后组镜片为第一双凸透镜、弯月形透镜和第二双凸透镜胶合而成的胶合镜片,所述主镜筒的前端设置有与前组镜片的周部相抵接的前压圈。该镜头镜头实现了体积小与高品质的高清像质共存。(The invention relates to a miniature 3.6mm day and night dual-purpose high-definition fixed focus lens which comprises a main lens barrel, wherein a front group of lenses, a diaphragm and a rear group of lenses are sequentially arranged in the main lens barrel from left to right along the light incidence direction, the front group of lenses are biconcave lenses, the rear group of lenses are cemented lenses formed by cementing a first biconvex lens, a meniscus lens and a second biconvex lens, and the front end of the main lens barrel is provided with a front pressing ring abutted against the periphery of the front group of lenses. The lens realizes the coexistence of small volume and high-quality high-definition image quality.)

1. The utility model provides a dual-purpose high definition tight shot of miniature 3.6mm day night, includes the main lens cone, its characterized in that, follow light incidence direction in the main lens cone and set gradually front group lens, diaphragm and back group lens from left right side, front group lens is biconcave lens, back group lens is the veneer lens that first biconvex lens, meniscus lens and the veneer of second biconvex lens formed, the front end of main lens cone is provided with the preceding clamping ring with the week looks butt of front group lens.

2. The miniature 3.6mm high definition prime lens for day and night use according to claim 1, wherein the air space between the biconcave lens and the first biconvex lens is 0.49 mm; the air space between the first biconvex lens and the meniscus lens is 0.09 mm.

3. The miniature 3.6mm high-definition prime lens for day and night use according to claim 1, wherein the curvature radii of the biconcave lens are 3.39mm and 2.73mm respectively; the curvature radius of the first biconvex lens is 8.58mm and 4.82mm respectively; the curvature radiuses of the meniscus lens are respectively 9.42mm and 3 mm; the curvature radius of the second biconvex lens is 3mm and 4.36mm respectively.

4. The miniature 3.6mm high definition prime lens for day and night use according to claim 1, 2 or 3, wherein a first space ring is arranged between the biconcave lens and the first biconvex lens in the main lens barrel, an annular space paper is arranged between the first space ring and the biconcave lens, and a second space ring is arranged between the first biconvex lens and the meniscus lens.

5. The miniature 3.6mm high-definition prime lens for day and night use according to claim 4, wherein an annular flange for abutting against the periphery of the second biconvex lens is arranged in the inner cavity at the rear end of the main lens barrel, and the front pressing ring is in threaded connection with an external thread arranged on the main lens barrel.

6. The miniature 3.6mm high definition prime lens for day and night use according to claim 1, 2, 3 or 5, wherein a cover glass is further disposed on the right side of the second biconvex lens glue.

Technical Field

The invention relates to a miniature 3.6mm day and night dual-purpose high-definition prime lens.

Background

At present, various 3.6mm and other short-focus lenses are applied to security systems in the market, but the imaging quality of the lenses is improved and stray light is reduced. Often through increase volume and lens, greatly increased product cost again like this, lead to the product to promote the degree of difficulty, market competition descends. In short, in the current security industry, the fixed-focus lens with small volume, low cost and high image quality has a real meaning.

Disclosure of Invention

The invention aims to provide a miniature 3.6mm day and night dual-purpose high-definition fixed focus lens, which realizes the coexistence of small volume and high-quality high-definition image quality.

The technical scheme of the invention is as follows: the utility model provides a dual-purpose high definition tight shot of miniature 3.6mm day night, includes the main lens cone, follow light incidence direction in the main lens cone and set gradually front group lens, diaphragm and back group lens from the left hand right side, front group lens is biconcave lens, back group lens is the cemented lens that first biconvex lens, meniscus lens and the second biconvex lens cemented and form, the front end of main lens cone is provided with the preceding clamping ring with the week looks butt of front group lens.

Further, the air space between the biconcave lens and the first biconvex lens is 0.49 mm; the air space between the first biconvex lens and the meniscus lens is 0.09 mm.

Further, the curvature radii of the biconcave lens are 3.39mm and 2.73mm respectively; the curvature radius of the first biconvex lens is 8.58mm and 4.82mm respectively; the curvature radiuses of the meniscus lens are respectively 9.42mm and 3 mm; the curvature radius of the second biconvex lens is 3mm and 4.36mm respectively.

Furthermore, a first space ring is arranged between the biconcave lens and the first biconvex lens in the main lens cone, annular space paper is arranged between the first space ring and the biconcave lens, and a second space ring is arranged between the first biconvex lens and the meniscus lens.

Furthermore, an annular flange used for abutting against the periphery of the second biconvex lens is arranged in the inner cavity at the rear end of the main lens barrel, and the front pressing ring is in threaded connection with an external thread arranged on the main lens barrel.

Further, a cover glass is arranged on the right side of the second biconvex lens glue.

Compared with the prior art, the invention has the following advantages:

1. the structural design of the lens adopts the layout of 1 lens in front of the diaphragm and 3 lenses behind the diaphragm, and the focal power is negative one positive, the total length of the optical path is short, so that the lens has small volume and large back focal length and can meet the requirements of cameras with various interfaces;

2. the system enables night vision, high and low temperature to be fully aligned by accurately distributing focal power, and ensures that the system can still be normally used in severe environments such as high and low temperature;

3. all the lenses adopt flint glass with high refraction and low dispersion and crown glass with high refraction index and high dispersion to eliminate chromatic aberration and astigmatism, so that the imaging quality of the lenses is ensured;

4. the CCD or CMOS sensor has the advantages of super economy, high resolution, dual-purpose day and night, simple structure and light weight, can be adapted to a CCD or CMOS with 200 ten thousand pixels and high resolution, and has a dominant position in a middle and low-end miniature television monitoring camera system;

5. the camera lens realizes coexistence of small volume and high quality, promotes development of a security lens to be small and fine, improves market competitiveness of products, and enlarges application range of the camera lens;

6. the lens has the advantages of ensuring excellent imaging quality, small temperature drift, day and night confocal performance, realizing lower cost, meeting the advantages of smaller volume, lighter weight and more simplified structure, not only reaching high-quality pixels in the daytime, but also having high-definition image quality under the night condition, and ensuring the imaging quality under the severe environment of extreme temperature.

Drawings

FIG. 1 is a diagram of the optical path system of the present invention;

FIG. 2 is a schematic view of a lens structure according to the present invention;

FIG. 3 is a MTF graph of the present invention under the condition of best image quality of the central visual field of visible light during focusing;

FIG. 4 is a graph of MTF at night vision for the present invention when focused;

in the figure: a1-double concave lens, B1-first double convex lens, B2-meniscus lens, B3-second double convex lens, 1-front pressing ring, 2-annular paper spacer, 3-first spacer, 4-second spacer, 5-main lens cone, 6-cover glass 7-imaging surface, 8-external thread, 9-annular flange.

Detailed Description

In order to make the aforementioned features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below, but the present invention is not limited thereto.

Refer to fig. 1 to 4

The utility model provides a dual-purpose high definition tight shot of miniature 3.6mm day night, includes main lens cone 5, follow light incidence direction in the main lens cone from the left hand right side and set gradually front group lens, diaphragm C and back group lens, front group lens is biconcave lens A1, back group lens is the cemented lens that first biconvex lens B1, meniscus lens B2 and second biconvex lens B3 veneer formed, the front end of main lens cone is provided with the preceding clamping ring 1 with the week looks butt of front group lens.

In this embodiment, the lenses and the spacer ring are fixed by the front pressing ring to satisfy the coaxiality and the air space between the lenses. The front pressing ring is processed by adopting precise numerical control processing equipment and has the advantages of high dimensional precision, good stability, light weight and the like.

In this embodiment, a Cover Glass 6 (Cover Glass) is further disposed on the right side of the second lenticular lens glue.

In this embodiment, the air space between the biconcave lens and the first biconvex lens is 0.49 mm; the air space between the first biconvex lens and the meniscus lens is 0.09 mm.

In this embodiment, the curvature radii of the biconcave lens are 3.39mm and 2.73mm, respectively; the curvature radius of the first biconvex lens is 8.58mm and 4.82mm respectively; the curvature radiuses of the meniscus lens are respectively 9.42mm and 3 mm; the curvature radius of the second biconvex lens is 3mm and 4.36mm respectively.

In this embodiment, a first space ring 3 is disposed between the biconcave lens and the first biconvex lens in the main barrel, and the first space ring is used to ensure an air space between the biconcave lens and the first biconvex lens and an assembly of an optical axis of the biconcave lens and the first biconvex lens, and intercept and absorb the ineffective light, and an extinction design is adopted inside the space ring to effectively solve the problem of stray light of the lens, so that an imaging picture is clear and has no stray light.

In this embodiment, an annular partition paper 2 is arranged between the first partition ring and the biconcave lens, and the invalid light of the biconcave lens and the first biconvex lens is intercepted by the annular partition paper, so that the clear aperture of the lens can be ensured by controlling the size of an inner hole at the position of the diaphragm.

In this embodiment, a second space ring 4 is disposed between the first biconvex lens and the meniscus lens, and the air space and the optical axis assembly of the first biconvex lens and the meniscus lens are ensured by the second space ring, and meanwhile, the invalid light is intercepted and absorbed, and the stray light problem of the lens can be effectively solved by adopting an extinction design inside the space ring.

In this embodiment, an annular flange 9 for abutting against the periphery of the second biconvex lens is disposed in the inner cavity at the rear end of the main barrel, and the front pressing ring is screwed with an external thread 8 disposed on the main barrel.

In this embodiment, the main lens barrel is used as a sleeve for bearing the lens and the spacer ring, is made of aluminum, and is processed by precise numerical control processing equipment, so that the main lens barrel has the advantages of high dimensional accuracy, good stability, light weight and the like. Besides the inner diameters of all steps in the main lens cone need to be processed strictly according to the drawing tolerance, the coaxiality between all steps is also an important factor for ensuring the imaging quality, namely, the plane where the space ring is contacted with the lens needs to have accurate perpendicularity and coaxiality to ensure the accuracy of lens assembly, so that the space ring is tightly matched with the lens, and the consistency of the optical axis of the lens is ensured. The lens cone is tightly matched with the threads of the front pressing ring and is dispensed with glue, so that the imaging quality is ensured, and certain waterproof and shockproof effects are achieved. The lens barrel also adopts an M8X0.35-6H interface mode to match the use requirements of a client camera.

The overall structure of the lens is light and handy, the principle of small overall size is met, the pressing ring, the main lens barrel and all the space rings are machined by adopting precise numerical control machining equipment in order to match precision, and the matching accuracy and stability of all mechanical parts and lenses are guaranteed.

In this embodiment, as can be seen from fig. 3 and 4, the distance difference between the visible light and the infrared light passing through the back focal plane of the lens is very small, and the visible light and the infrared light are on the same image planeCan simultaneously meet the imaging requirements of two wave bands. When visible light imaging is carried out, the position of the 80 line pairs of the central view field is more than 0.85, and the position of the 80 line pairs of the edge view field is more than 0.2; infrared 0.85

When the wavelength is imaged, the position of the 80 line pairs of the central view field is larger than 0.75, and the position of the 80 line pairs of the edge view field is larger than 0.3, so that the day and night confocal effect is really realized.

In addition, the technical indexes which can be realized by the invention are as follows:

focal length: f' =3.6 mm;

relative pore size F = 2.5;

the field angle is more than or equal to 80 degrees (the image field angle is 2 η' ≧ phi 4.5 mm);

distortion: less than-27 percent;

resolution ratio: can be matched with 200 ten thousand pixel high-resolution CCD or CMOS cameras;

the total length sigma of the optical path is less than or equal to 11.5mm, and the optical back intercept L' is more than or equal to 5 mm;

applicable spectral line range: 480 nm-850 nm.

It will be apparent to those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and it is not necessary to invent or create a new design of miniature 3.6mm day and night high definition prime lens with different forms according to the teachings of the present invention, and all equivalent changes, modifications, substitutions and alterations made in the claims of the present invention should fall within the scope of the present invention.