KR102053838B1

KR102053838B1 - Lens

Info

Publication number: KR102053838B1
Application number: KR1020120144877A
Authority: KR
Inventors: 박선아; 안명진; 권나영
Original assignee: 엘지이노텍 주식회사
Priority date: 2012-12-12
Filing date: 2012-12-12
Publication date: 2019-12-09
Also published as: KR20140076397A

Abstract

A lens according to the present invention includes a lens body having a first effective diameter having a first curvature and a second effective diameter having a second curvature; A ring-shaped first groove having a first diameter formed on an upper surface of the first effective diameter; And a ring-shaped second groove having a second diameter formed on a lower surface of the second effective diameter, wherein the first groove, the second groove, and the lens body may be arranged to be concentric.

Description

Lens {Lens}

The present invention relates to a lens applied to the camera module.

In the camera module, various types of lenses are assembled and used in the lens barrel assembly to transfer external images to the image sensor. Various types of lenses can be used. For example, a diffractive optical element lens diffracts light passing by forming an aspheric surface formed at an arbitrary pitch and an arbitrary depth on the surface of the base material. It can be a lens.

Diffraction optical element lens (hereinafter referred to as 'DOE lens') is used as collimated lens such as LD, laser scanning unit (LSU), CD, DVD, etc., optical lens for display such as projection TV, or optical communication connector It can be used as a lens or the like. DOE lenses are mostly micro lenses that are about 1 mm in diameter and only a few micrometers thick. As a method of manufacturing such a DOE lens, there is a machining method, an epoxy molding or an injection molding method.

Recently, such aspherical lenses are formed in a plurality of stages and combined to form a lens of a camera module. In this case, the eccentricity and tilt at each lens stage are the lens and the optical system using the lens. It is a very important factor in implementing the performance of. In order to check the eccentricity of the lens at the manufacturing stage, the center is generally checked by a microscope or the like with reference to the outer diameter of the lens to determine whether the center of the lens of each stage is eccentric.

However, after assembling the lens to the lens barrel, there is a problem that it is almost impossible to check the eccentricity using the outer diameter due to the lens barrel. Therefore, the optical method is used to check the eccentricity by transmitting or reflecting light to the lens, but since the components such as the lens are very small and precise, not only accurate measurement is difficult, but also the eccentricity adjustment while performing the eccentric inspection There is also a problem that is difficult to do.

Japanese Laid-Open Patent Publication No. 2005-083981 (2005.03.01.) Republic of Korea Patent Publication No. 10-2006-0129322 (2006.12.15.)

SUMMARY OF THE INVENTION An object of the present invention is to provide a lens having an improved structure so as to include a confirmation means that can be used for eccentricity checking and inspection.

According to one embodiment of the invention, the first ring is inserted into the first groove; And a second ring inserted into the second groove.

Cross sections of the first and second rings may be formed in any one of a circle, a semicircle, a wedge, a rectangle, and a polygon.

The first and second grooves may be formed at positions not interfering with the first and second effective diameters, and the distance between the first groove and the lens body center may be greater than the distance between the second groove and the lens center. have.

The first and second grooves have the same width and may be formed within 20 μm.

The curvature of the first effective diameter may be larger than the curvature of the second effective diameter, and the diameter of the first effective diameter may be larger than the diameter of the second effective diameter.

The lens body may mold the first effective diameter, the second effective diameter, the first groove, and the second groove at a time by using a mold.

The lens body may have a diameter of an outer diameter greater than that of the first and second effective diameters.

In addition to the outer diameter on the surface of the lens is provided with a fine shape, as a reference point, since the center of the lens can be measured quickly and accurately, eccentricity check and inspection can be easily performed.

In addition, while performing the eccentric inspection of the lens, it is possible to accurately align the center of the lens to implement the lens of the high performance camera module.

1 is a perspective view showing an example of a lens coupled to both upper and lower sides according to an embodiment of the present invention,
2 is an exploded perspective view of FIG. 1;
3 is a cross-sectional view of FIG. 1, and
4 is a plan view of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 is a perspective view showing an example of a lens coupled to the upper and lower both sides according to an embodiment of the present invention, Figure 2 is an exploded perspective view of Figure 1, Figure 3 is a cross-sectional view of Figure 1, and Figure 4 of Figure 1 It is a top view.

1 is a view showing a lens according to an embodiment of the present invention schematically illustrates a case in which aspherical lenses having different diameters are assembled up and down to form one lens body.

As shown, the lens body 1 may be composed of a combination of the first and second effective diameters 10 and 20, and differently formed curvatures of the first and second effective diameters 10 and 20. can do. The lens body 1 may be formed of a light transmissive material, and the first and second effective diameters 10 and 20 may be integrally formed with the lens body 1.

The diameter of the first effective diameter 10 and the diameter of the second effective diameter 20 may be formed to have different values. According to an embodiment of the present invention, the diameter of the first effective diameter 10 is the second diameter. It may be formed larger than the diameter of the effective diameter (20).

Meanwhile, the centers of the first and second effective mirrors 10 and 20 need to be formed to be coaxial with each other. If an eccentricity is deviated from these centers, since the centers of the first and second effective mirrors 10 and 20 may be poor lenses, normal operation may be impossible. In order to prevent such a lens from being used in a camera module or the like, it is necessary to confirm whether the lens is defective in advance.

The present invention is characterized in that the lens itself is provided with a means for easily detecting a defective lens in advance.

The lens according to the present invention for this purpose is the first groove 2 and the outer side of the first and second effective diameter 10, 20 constituting the lens body 1, as shown in Figs. The second groove 3 can be formed.

The diameter of the first groove 2 may be formed to be larger than the diameter of the second groove 3, as shown, but is not limited thereto and, if necessary, the diameter of the first groove 2 may be greater than that of the first groove 2. It is also possible to form a larger diameter. However, the diameters of the first and second grooves 2 and 3 may be configured differently so that the first and second grooves 2 and 3 do not overlap each other when viewed in a plan view.

The first and second grooves 2 and 3 optically check whether the centers of the first effective diameter 10 and the second effective diameter 20 coincide with each other. 2 As a reference of the outer boundary of the effective diameter 20, according to an embodiment of the present invention, the first and second grooves (2) (3) are provided in a ring shape, their center and the first and The centers of the second effective diameters 10 and 20 may be formed to be the same.

Meanwhile, the first and second grooves 2 and 3 may be engraved, and the width thereof may be provided not to exceed 20 μm. This is because if the first and second grooves 2 and 3 are formed too large, the non-image area through which light does not pass in the lens body 1 may increase, which may unnecessarily increase the size of the camera module. In addition, the first and second grooves 2 and 3 may be provided with a shape of a groove in a predetermined mold in advance, and thus may be integrally formed with the lens body 1 when injection molding the lens body 1. have.

Although only the first and second grooves 2 and 3 may optically measure the centers of the first and second effective diameters 10 and 20, the lens body 1 is generally formed of a light transmissive material. Therefore, when observing using an electron microscope or the like, the first and second grooves 2 and 3 may not be clearly seen.

Therefore, as shown in FIGS. 1 to 4, the lens according to the embodiment of the present invention inserts the first and second rings 100 and 200 into the first and second grooves 2 and 3. Can be installed.

The first and second rings 100 and 200 may be provided in a ring shape having a diameter corresponding to the diameters of the first and second grooves 2 and 3, according to an embodiment of the present invention. The cross section may be configured in various ways such as a wedge, a semicircle, a circle, a right angle, a polygon such as a trapezoid, and the like.

In addition, the first and second rings 100 and 200 may be formed of an opaque material so that the first and second rings 100 and 200 may be clearly observed using a microscope or the like. . In this case, since the diameters of the first and second rings 100 and 200 are also the same as those of the first and second grooves 2 and 3, each diameter may have a different value.

Therefore, as shown in FIG. 4, when the lens body 1 is viewed through a microscope or the like in a plane, the first and second rings 100 and 200 may be observed at different positions, and if the first And when the center of the second ring 100, 200 is observed in the optically different position, it can be easily confirmed that the first and second effective mirrors 10, 20 are formed in an eccentric state.

According to the lens according to the present invention, because it is possible to accurately determine the eccentricity of the lens in a non-contact manner through an optical measuring equipment such as a microscope instead of physically scraping the lens surface to determine the shape and center of the lens, contact There is no fear of scratches on the surface of the lens that can occur during eccentric detection of the system, and the first and second rings 100 and 200 or the first and second grooves 2 and 3 Since it is used as a reference point for measuring the center of the effective diameter (10, 20), it is possible to determine whether the eccentricity is more accurate.

In particular, since the boundary of the effective diameter is not clear due to the curved surface of the lens, it is possible to check whether the eccentricity of the double-sided lens occurs in a non-contact method even in a lens that cannot be measured conventionally, which is advantageous for product yield and process shortening.

The embodiments of the present invention described above and illustrated in the drawings should not be construed as limiting the technical idea of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention as long as it will be apparent to those skilled in the art.

One; Lens body 2; First home
3; Second groove 10; 1st effective diameter
20; Second effective diameter 100; First ring
200; Second ring

Claims

A lens body having a first effective diameter having a first curvature and a second effective diameter having a second curvature;
A ring-shaped first groove having a first diameter formed on an upper surface of the first effective diameter; And
A ring-shaped second groove having a second diameter formed on a lower surface of the second effective diameter;
A first ring inserted into the first groove; And
A second ring inserted into the second groove,
The first ring and the second ring is an opaque material,
And the first groove, the second groove and the lens body are arranged concentrically.

delete

The method of claim 1,
Cross sections of the first and second rings are formed in the form of any one of a circle, a semicircle, a wedge, a rectangle and a polygon.

The method of claim 1, wherein the first and second grooves,
And a lens formed at a position that does not interfere with the first and second effective mirrors.

The method of claim 1,
And the distance between the first groove and the center of the lens body is greater than the distance between the second groove and the lens center.

The method of claim 1,
The first and second grooves have the same width.

The method of claim 6,
The width of the first and second grooves is formed within 20㎛.

The method of claim 1,
The curvature of the first effective diameter is formed larger than the curvature of the second effective diameter.

The method of claim 1,
The diameter of the first effective diameter is larger than the diameter of the second effective diameter.

The method of claim 1, wherein the lens body,
A lens for molding the first effective diameter, the second effective diameter, the first groove and the second groove at a time by using a mold.

The method of claim 1, wherein the lens body,
And a disk-shaped lens having an outer diameter larger than that of the first and second effective diameters.