CN209765146U

CN209765146U - Low-cost high definition optical lens

Info

Publication number: CN209765146U
Application number: CN201920873627.6U
Authority: CN
Inventors: 史迎媛
Original assignee: Wendeng Chengjin Optical Co Ltd
Current assignee: Wendeng Chengjin Optical Co Ltd
Priority date: 2019-06-12
Filing date: 2019-06-12
Publication date: 2019-12-10
Anticipated expiration: 2029-06-12

Abstract

The utility model discloses a low-cost high-definition optical lens, which comprises a compression ring, a lens cone, a first lens, a second lens, a third lens and a fourth lens; the first lens, the second lens, the third lens and the fourth lens are coaxially arranged between the object plane and the image plane from front to back and are all positioned in the lens barrel; the first lens is fixedly connected with the lens cone through a pressure ring; a first spacing ring is arranged between the first lens and the second lens; a second spacing ring is arranged between the second lens and the third lens; a third spacing ring is arranged on the rear side of the fourth lens, and an optical filter is arranged on the rear side of the third spacing ring; the first spacing ring, the second spacing ring, the third spacing ring and the optical filter are all arranged inside the lens barrel; the utility model discloses a low-cost high definition optical lens makes it have good optical properties such as low cost, big light ring, super wide angle, high pixel through the intercombination of four different lenses, when being applied to imaging device such as vehicle event data recorder, can shoot out the high definition picture.

Description

Low-cost high definition optical lens

Technical Field

The utility model relates to an optical lens especially relates to a low-cost high definition optical lens.

background

The automobile data recorder is an instrument for recording related information such as images and sounds during the running process of the automobile, is used for recording video images and sounds of the whole running process of the automobile, and can provide evidences for traffic accidents. In recent years, a great background of safe driving of vehicles and quick handling of traffic accidents has made higher demands on lenses of automobile data recorders. At present, the lens quantity that current vehicle event data recorder camera lens contained is more, because the glass lens is mostly the artifical hand-made of utilization of labour intensive enterprise, and mass production is consuming time and is consuming effort, causes optical lens's manufacturing cost too expensive.

SUMMERY OF THE UTILITY MODEL

In order to solve the shortcomings of the prior art, the utility model provides a low-cost high-definition optical lens.

in order to solve the technical problem, the utility model discloses a technical scheme is: a low-cost high-definition optical lens comprises a compression ring, a lens barrel, a first lens, a second lens, a third lens and a fourth lens; the first lens, the second lens, the third lens and the fourth lens are coaxially arranged between the object plane and the image plane from front to back and are all positioned in the lens barrel; a diaphragm is arranged between the first lens and the second lens; the first lens is fixedly connected with the lens cone through a pressure ring;

A first spacing ring is arranged between the first lens and the second lens; a second spacing ring is arranged between the second lens and the third lens; a third spacing ring is arranged on the rear side of the fourth lens, and an optical filter is arranged on the rear side of the third spacing ring; the first spacing ring, the second spacing ring, the third spacing ring and the optical filter are all arranged inside the lens barrel;

The first lens is a meniscus lens with negative focal power and a convex surface facing the object plane, the second lens is a double-convex lens with positive focal power, the third lens is a double-convex lens with positive focal power, and the fourth lens is a plano-concave lens with negative focal power and a concave surface facing the object plane.

further, the refractive index Nd of the first lens is 1.4< Nd <1.6, and the dispersion ratio Vd is 59< Vd < 63;

The refractive index Nd of the second lens is 1.5< Nd <1.7, and the dispersion ratio Vd is 53< Vd < 57;

The refractive index Nd of the third lens is 1.6< Nd <1.8, and the dispersion ratio Vd is 54< Vd < 57;

The refractive index Nd of the fourth lens is 1.7< Nd <1.9, and the dispersion ratio Vd is 22< Vd < 25.

further, the pressing ring is connected with the lens barrel through threads.

Furthermore, the first lens, the second lens, the third lens and the fourth lens are all glass spherical lenses.

the utility model discloses a low-cost high definition optical lens makes it have good optical properties such as low cost, big light ring, super wide angle, high pixel through the intercombination of four different lenses, when being applied to imaging device such as vehicle event data recorder, can shoot out the high definition picture.

Drawings

fig. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a diagram illustrating the path of light entering from the first embodiment.

FIG. 3 is a graph of MTF resolution in fields of 0.1 to 0.4 according to an embodiment.

FIG. 4 is a graph of MTF resolution for the first embodiment in the 0.5 to 0.9 field of view.

FIG. 5 is a graph of MTF resolution in the 1.0 field of view according to one embodiment.

Fig. 6 is a field curvature diagram of the first embodiment.

Fig. 7 is an optical distortion diagram according to the first embodiment.

FIG. 8 is a dot-sequence diagram of the first embodiment.

In the figure: 1. pressing a ring; 2. a first lens; 3. a lens barrel; 4. a first spacer ring; 5. a second lens; 6. a second spacer ring; 7. a third lens; 8. a fourth lens; 9. a third spacer ring; 10. an optical filter; 11. an image plane; 12. a diaphragm; 13. and (4) an object plane.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, a low-cost high-definition optical lens includes a compression ring 1, a lens barrel 3, a first lens 2, a second lens 5, a third lens 7, and a fourth lens 8; the first lens 2, the second lens 5, the third lens 7 and the fourth lens 8 are coaxially arranged between the object plane 13 and the image plane 11 from front to back and are all positioned in the lens barrel 3; the first lens 2 is fixedly connected with the lens cone 3 through a pressure ring 1; the first lens 2, the second lens 5, the third lens 7 and the fourth lens 8 are all glass spherical lenses, have good aberration characteristics and good imaging quality, and can also effectively reduce the processing difficulty and the production cost.

The first lens 2 is a meniscus lens with negative focal power and a convex surface facing the object plane, and is used for receiving external light with the maximum field angle, so that the light transmission performance is good, the maximum angle of 126 degrees of diagonal photographing can be realized, and partial aberration can be corrected.

The second lens 5 is a double-convex lens with positive focal power, the third lens 7 is a double-convex lens with positive focal power, and the fourth lens 8 is a plano-concave lens with negative focal power and a concave surface facing the object plane; the second lens 5, the third lens 7 and the fourth lens 8 are a group of lenses and are used for receiving the light rays of the first lens 2, correcting aberration and converging an image on an image plane with high definition; a diaphragm 12 arranged between the first lens 2 and the second lens 5 serves to limit the optical flux entering the set of lenses.

A first spacing ring 4 is arranged between the first lens 2 and the second lens 5; a second spacing ring 6 is arranged between the second lens 5 and the third lens 7; the rear side of the fourth lens 8 is provided with a third spacer ring 9, the rear side of the third spacer ring 9 is provided with an optical filter 10, noise light outside a design waveband can be filtered, the imaging definition is further improved, the optical efficiency is improved, the optimal imaging effect is achieved, and two million pixels can be achieved.

The first spacing ring 4, the second spacing ring 6, the third spacing ring 9 and the optical filter 10 are all arranged inside the lens barrel 3; the pressing ring 1 is connected with the lens cone 3 through threads, and all lenses and the spacing ring in the lens cone 3 are fixed after the pressing ring 1 is twisted.

The refractive index Nd of the first lens 2 is 1.4< Nd <1.6, and the dispersion ratio Vd is 59< Vd < 63;

the refractive index Nd of the second lens 5 is 1.5< Nd <1.7, and the dispersion ratio Vd is 53< Vd < 57;

the refractive index Nd of the third lens 7 is 1.6< Nd <1.8, and the dispersion ratio Vd is 54< Vd < 57;

The refractive index Nd of the fourth lens 8 is 1.7< Nd <1.9, and the dispersion Vd is 22< Vd < 25.

the optical properties of the present invention are further illustrated by a specific example.

The first embodiment is as follows:

In this embodiment, specific optical parameters of the optical lens are shown in table 1:

TABLE 1

Surface name	Surface type	Radius of curved surface	thickness of	Glass material
					First lens	Spherical surface	140.7	0.4	BACD5
	spherical surface	2.71	6.49
					diaphragm	Spherical surface	Infinite number of elements	0.66
Second lens	Spherical surface	11.95	4	LAC9
						Spherical surface	-7.62	0.33
Third lens	Spherical surface	6	2.5	LAK14
					Fourth lens	Spherical surface	-3.5	0.35	FDS90
	Spherical surface	infinite number of elements	0.29
					Optical filter	Spherical surface	Infinite number of elements	0.4	BK7

The optical performance of the present invention was verified through a specific experiment.

The MTF (Modulation Transfer Function) resolution curves of the present embodiment in different FIELDs of view (FIELD) are shown in fig. 3, 4, and 5; where THE abscissa SPATIAL FREQUENCY IN CYCLES PERMILLIMETER represents THE line pair/SPATIAL FREQUENCY per millimeter (lp/mm) and THE ordinate MODULUS OF THE OTF is THE optical modulation transfer function, where OTF is collectively referred to as: optical transfer function, i.e. the optical transfer function; PolyCHROMATICDIFFRACTION MTF represents polychromatic diffraction MTF. As can be seen from fig. 3-5, the present embodiment exhibits better contrast within the spatial frequency of 100lp/mm, which can indicate that the integrated resolution level of the present embodiment is higher.

The field curvature diagram and the optical DISTORTION diagram of the present embodiment are shown in fig. 6 and 7, wherein fig. 6 is the field curvature diagram (FIE LD CURVETUR), fig. 7 is the optical DISTORTION diagram (distorrion), and the vertical axes of the two graphs are normalized fields of view. The horizontal axis of FIG. 6 is field curvature in millimeters (MILLIMETERS); t and S respectively represent meridional and sagittal vectors, the distance between T and S represents the size of astigmatism, the beamlet field curvature reflects the position change of a beamlet image point of different view field points away from an image plane, the primary beamlet field curvature is in direct proportion to the square of the view field, and the influence on the imaging is to enable a planar object to form a curved image plane; beamlet astigmatism reflects the axial distance separating the misalignment of the meridional and sagittal beamlet image points (or meridional and sagittal curvature image planes). As can be seen from fig. 6, the degree of astigmatism of this embodiment is relatively light, and can be controlled within 0.05, which reflects that this embodiment has a relatively low optical distortion level to some extent; the horizontal axis of fig. 7 is the percentage value of distortion (PERCE NT), and it can be seen from fig. 7 that the maximum optical distortion of this embodiment is-54.72%, which has lower optical distortion and better optical performance.

The optical system dot DIAGRAM (SPOT diameter) of the present embodiment at different FIELDs of view (FIELD), as shown in fig. 8; wherein RMS RADIUS represents root mean square RADIUS, GEO RADIUS represents sphere RADIUS, SCALE BAR represents SCALE, REFERENCE represents REFERENCE, CHIEF RAY represents CHIEF RAY; the smaller the numerical values of the root-mean-square radius and the spherical radius are, the better the imaging quality is, and in the graph, the imaging points under each view field are almost converged into an ideal point, which shows that the embodiment has good imaging performance.

Compared with the prior art, the utility model, following advantage has:

1) The low-cost high-definition optical lens of the utility model consists of four glass spherical lenses, and when the size of the image surface of the imaging surface is 1/4 inches, the maximum angle of diagonal shooting is 126 degrees;

2) The image distortion is low, the image distortion is light, and the resolution and definition of the shot image can be effectively ensured under the condition of ensuring a larger field angle;

3) The low-cost high-definition optical lens consists of four lenses, the cost is reduced while high imaging definition is ensured, and the imaging definition can reach two million pixels.

The above embodiments are not intended to limit the present invention, and the present invention is not limited to the above examples, and the technical personnel in the technical field are in the present invention, which can also belong to the protection scope of the present invention.

Claims

1. A low-cost high-definition optical lens is characterized in that: the lens comprises a press ring (1), a lens barrel (3), a first lens (2), a second lens (5), a third lens (7) and a fourth lens (8); the first lens (2), the second lens (5), the third lens (7) and the fourth lens (8) are coaxially arranged between the object plane (13) and the image plane (11) from front to back and are all positioned in the lens barrel (3); a diaphragm (12) is arranged between the first lens (2) and the second lens (5); the first lens (2) is fixedly connected with the lens cone (3) through a pressing ring (1);

A first spacing ring (4) is arranged between the first lens (2) and the second lens (5); a second spacing ring (6) is arranged between the second lens (5) and the third lens (7); a third spacing ring (9) is arranged on the rear side of the fourth lens (8), and an optical filter (10) is arranged on the rear side of the third spacing ring (9); the first spacing ring (4), the second spacing ring (6), the third spacing ring (9) and the optical filter (10) are all arranged inside the lens barrel (3);

the first lens (2) is a meniscus lens with negative focal power and a convex surface facing an object plane, the second lens (5) is a double-convex lens with positive focal power, the third lens (7) is a double-convex lens with positive focal power, and the fourth lens (8) is a plano-concave lens with negative focal power and a concave surface facing the object plane.

2. The low-cost high-definition optical lens according to claim 1, wherein:

the refractive index Nd of the first lens (2) is 1.4< Nd <1.6, and the dispersion ratio Vd is 59< Vd < 63;

The refractive index Nd of the second lens (5) is 1.5< Nd <1.7, and the dispersion ratio Vd is 53< Vd < 57;

The refractive index Nd of the third lens (7) is 1.6< Nd <1.8, and the dispersion ratio Vd is 54< Vd < 57;

The refractive index Nd of the fourth lens (8) is 1.7< Nd <1.9, and the dispersion ratio Vd is 22< Vd < 25.

3. The low-cost high-definition optical lens according to claim 1, wherein: the pressing ring (1) is connected with the lens cone (3) through threads.

4. the low-cost high-definition optical lens according to claim 1, wherein: the first lens (2), the second lens (5), the third lens (7) and the fourth lens (8) are all glass spherical lenses.