CN102819080A - Lens module - Google Patents

Abstract

The invention relates to a lens module. The lens module comprises a first lens, a shade and a second lens. The first lens, the shade and the second lens are sequentially arranged from an objective side to an image side of the lens module. The first lens comprises a first optical part and a first support part. The first support part surrounds the first optical part and comprises a first lower surface which locates on the image side of the first lens and is recessed towards the objective side of the first lens. The shade comprises a first shading part, a second shading part and a third shading part, which are connected in sequence. The second shading part extends from the inner edge of the first shading part to the outer edge of the third shading part in a cone frustum form. The third shading part and the first shading part are concentric and parallel to each other. The shade is used to cover the first lower surface and is capable of absorbing light refracted to the first lower surface, so that dazzling generated by the light refracted to an image sensor is avoided, and vivid images can be generated by the lens module.

Description

Lens module

technical field

The invention relates to the field of lens processing, in particular to a lens module using the shading sheet.

Background technique

Existing lens modules usually include a lens barrel, a plurality of plastic lenses held in the lens barrel, an infrared cut filter, a shading sheet, and other optical components. There are through holes. When in use, the shading sheet is arranged between two adjacent lenses to separate the two adjacent lenses, the light used for imaging passes through the through hole and is imaged on the image sensor, and the rest of the light is shaved by the shading Sheet absorbs. In this way, the light reflected by the surface can be prevented from being reflected or refracted to be imaged on the image sensor to cause glare, so as to ensure the image quality and prevent distortion and deformation of the shooting picture.

However, it is still difficult for ordinary shading sheets to achieve a better shading effect in a strong light external environment. In particular, since the existing lens usually has a slope-shaped non-optical area, and the shading plate is in the shape of an annular plate, it cannot completely absorb the light entering the non-optical area, so that the light is reflected or refracted in the non-optical area. , can still be incident on the image sensor to produce glare, resulting in blurred imaging. In order to reduce glare, the non-optical area of the lens usually requires surface atomization treatment such as scratching or sandblasting. However, in the molding process of plastic lenses, surface atomization treatment is more likely to cause mold sticking, which is not conducive to improving work efficiency. And the cost is higher.

Contents of the invention

In view of this, it is necessary to provide a lens module that can reduce glare.

A lens module includes a first lens, a light-shielding sheet and a second lens arranged in sequence from the object side to the image side of the lens module. The first lens includes a first optical part and a first supporting part. The first supporting portion is disposed around the first optical portion, and the first supporting portion includes a first lower surface located on the image side of the first lens and partially recessed toward the object side of the first lens. The light-shielding sheet includes a first light-shielding portion, a second light-shielding portion, and a third light-shielding portion connected in sequence, and the second light-shielding portion extends from the inner edge of the first light-shielding portion to the third light-shielding portion in a frustum shape. The outer edge of the portion, the third light shielding portion and the first light shielding portion are in the shape of concentric rings and are parallel to each other. The shading sheet is used to cover the first lower surface.

Compared with the prior art, the shading sheet provided by the present invention has a first shading portion, a second shading portion and a third shading portion, so it can absorb the light refracted to the first lower surface, thereby preventing the light from being reflected to The glare phenomenon generated by the image sensor ensures that the lens module forms a clear image.

Description of drawings

FIG. 1 is a schematic cross-sectional view of a lens module provided by a first embodiment of the present invention, and the lens module has a light-shielding sheet.

FIG. 2 is a perspective cross-sectional view of a light-shielding sheet of the lens module of FIG. 1 .

FIG. 3 is a schematic cross-sectional view of the lens module provided by the second embodiment of the present invention.

FIG. 4 is a perspective cross-sectional view of a light-shielding sheet of the lens module in FIG. 3 .

Description of main component symbols

Lens module 100, 200 lens barrel 10 Front cover 11 Clear hole 111 Cylinder 13 containment cavity 131 first lens 20, 20A First Optics twenty one first support twenty three first upper surface 231 first lower surface 233 first ring 233a, 233aA Inclined part 233b, 233bA second ring 233c, 233cA first side 235 second lens 30,30A second optics 31 second support 33 second upper surface 331 second lower surface 333 second side 335, 335A Shading film 40, 40A first shading part 41, 41A second shading part 43, 43A third shade 45, 45A outer edge 411 inner edge 413 first via 414 flange 415, 415A Frusto-conical inner surface 417 Second via 418 filter 50 optical axis o

The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

Detailed ways

first embodiment

Please refer to FIG. 1 , the first embodiment of the present invention provides a lens module 100 . The lens module 100 includes a lens barrel 10 , a first lens 20 , a second lens 30 , a light shield 40 and a filter 50 .

The lens barrel 10 has a front cover 11 and a cylinder 13 extending from the front cover 11 . In this embodiment, the front cover 11 is in the shape of a circular plate, and the cylinder 13 extends vertically from the front cover 11 . The central part of the front cover 11 defines a light through hole 111, the light through hole 111 defines an optical axis O located at its central axis, and the cylindrical body 13 surrounds the optical axis O to form a cylinder A receiving cavity 131 is formed, and the receiving cavity 131 communicates with the light-through hole 111 . When in use, the light-through hole 111 can allow external light to enter the receiving cavity 131 .

The first and second lenses 20 and 30 are both plastic lenses, wherein the first lens 20 is disposed adjacent to the front cover 11 , and the second lens 30 is located on the image side of the first lens 20 .

The first lens 20 includes a first optical portion 21 and a first supporting portion 23 surrounding the first optical portion 21, and the first supporting portion 23 includes a first upper surface 231 and a first upper surface 231 oppositely arranged. The lower surface 233 and a first side 235 connecting the first upper surface 231 and the first lower surface 233 . The first upper surface 231 is parallel to the front cover 11 , and the first lower surface 233 is located on the image side of the first lens 20 and is recessed toward the object side of the first lens 20 . The first lower surface 233 includes a first annular portion 233a, an inclined portion 233b forming a certain inclined angle with the first annular portion 233a, and a second annular portion 233c extending from the inclined portion 233b, Both ends of the inclined portion 233b are respectively connected to the inner edge of the first annular portion 233a and the outer edge of the second annular portion 233c.

The second lens 30 includes a second optical portion 31 and a second supporting portion 33 surrounding the second optical portion 31 . The second supporting portion 33 includes a second upper surface 331, a second lower surface 333 and a second side 335 connecting the second upper surface 331 and the second lower surface 333, the second upper surface 331 Parallel to the first upper surface 231 , the configuration of the second lower surface 333 is substantially the same as that of the first lower surface 233 .

The shading sheet 40 is fixed between the first lower surface 233 and the second upper surface 331 to separate the first lens 20 and the second lens 30 . The light-shielding sheet 40 includes a first light-shielding portion 41 in the shape of an annular plate, a second light-shielding portion 43 forming a certain inclination angle with the first light-shielding portion 41 , and a ring-shaped light-shielding portion 43 aligned with the first light-shielding portion 41 . The third light shielding portion 45 is arranged concentrically, and the two ends of the second light shielding portion 43 are respectively connected to the first light shielding portion 41 and the third light shielding portion 45 . The light-shielding sheet 40 is made of a bendable light-shielding material, for example, it can be a copper sheet coated with black paint, or black polyester. In this embodiment, the material of the light-shielding sheet 40 is black polyester. It can be understood that the material of the light-shielding sheet 40 is not limited to the above two.

Please refer to FIG. 2, specifically, the first light shielding portion 41 includes an outer edge 411 and an inner edge 413, and a first through hole 414 is formed in the center thereof, and the center of the first through hole 414 is located on the optical axis O. . The thickness of the first light shielding portion 41 is approximately 0.030-0.054 mm. In this embodiment, the thickness of the first light shielding portion 41 may be approximately 0.033 mm. The first light shielding portion 41 is bonded to the first annular portion 233a of the first lens 20 by glue. A flange 415 extends from the outer edge 411 of the first light shielding portion toward the third light shielding portion 45 , and the flange 415 is parallel to the optical axis O. The inner diameter of the flange 415 is equal to the outer diameter of the first lens 20, and the extension length of the first light shielding portion 41 is less than or equal to the first side 235, so that the flange 415 can be sleeved on the on the first lens 20 to define the light shielding sheet 40 on the first lens 20 .

The second light shielding portion 43 extends from the inner edge 413 of the first light shielding portion 41 in a frustum shape along the optical axis O to the outer edge of the third light shielding portion 45 . The first light shielding portion 41 forms an included angle greater than 0 degrees. In this embodiment, the included angle is 65°. An included angle between the second light shielding portion 43 and the first light shielding portion 41 is approximately equal to an inclination angle of the inclined portion 233 b relative to the first annular portion 233 a. Thus, the second light shielding portion 43 is formed with a truncated cone-shaped inner surface 417 , and the truncated cone-shaped inner surface 417 is inclined relative to the optical axis O. As shown in FIG. In this embodiment, the diameter of the truncated cone-shaped inner surface 417 gradually decreases along the optical axis O and away from the first light shielding portion 41 . A second through hole 418 is formed at the center of the other end of the truncated cone-shaped inner surface 417 , and the second through hole 418 is concentric with the first through hole 414 . In addition, the thickness of the second light shielding portion 43 may be approximately 0.030-0.054 mm. In this embodiment, in order to facilitate injection molding with the first light shielding portion 41 , the thickness of the second light shielding portion 43 is the same as that of the first light shielding portion 41 . The second light shielding portion 43 is bonded to the inclined portion 233b of the first lens 20 by glue.

The third light shielding portion 45 extends from the edge of the second through hole 418 along the radial direction of the first light shielding portion 41 . The ring diameter of the third light shielding portion 45 is smaller than the radial width of the first light shielding portion 41 . In this embodiment, the ring diameter of the third light shielding portion 45 is approximately equal to 0.5 mm.

In other embodiments, if more than two lenses are provided in the lens module 100 , the shading sheet 40 may be provided between other adjacent lenses to separate the adjacent lenses.

In addition, when the shape of the lens (including the first lens 20 and the second lens 30 ) changes, for example, the included angle of the inclined portion 233b changes, the distance between the first light shielding portion 41 of the light shielding sheet 40 and the optical axis O The included angle also changes accordingly. However, when the shape of the first annular portion 233 a changes slightly and the first annular portion 233 a can be supported by the light shielding sheet 40 , the shape of the light shielding sheet 40 does not need to be changed.

The filter 50 is disposed on the image side of the second lens 30 . In this embodiment, the filter 50 is bonded to the second lower surface 333 of the second supporting portion 33 by glue. The filter 50 may specifically be an infrared cut filter (infrared cut filter), which is used to filter out infrared light that cannot be recognized by human eyes.

When assembling the shading sheet 40, the shading sheet 40 is covered on the bottom of the first lens 20, so that the flange 415 is attached to the first side 235, and the first shading part 41 is in contact with the first lens 20. The first annular portion 233a of the first lens 20 is bonded, the second light shielding portion 43 is bonded to the inclined portion 233b of the first lens 20, the third light shielding portion 45 is bonded to the first lens 20 The second annular portion 233c fits. Thus, the light shielding sheet 40 can be stably installed between the first lens 20 and the second lens 30 according to the setting method, preventing the light shielding sheet 40 from shifting in the left and right direction, and the second light shielding part 43 And the third light shielding portion 45 can guide the incident angle of the incident light so that the incident angle is limited within a preset range. Finally, the lens barrel 10 is covered on the first lens 20 , the second lens 30 , the shading sheet 40 and the filter 50 .

second embodiment

Please refer to Fig. 3 and Fig. 4, the lens module 200 provided by the second embodiment of the present invention is substantially the same as the lens module 100 provided by the first embodiment, except that the flange 415A is away from the second light shielding portion 43A and extend in a direction parallel to the central axis of the first light shielding portion 41A, and the inner diameter of the flange 415A is equal to the outer diameter of the second lens 30A.

When assembling the shading sheet 40A, cover the shading sheet 40A on the top of the second lens 30A, so that the flange 415A is attached to the second side 335A, and the first shading part 41A is in contact with the second side 335A. The first annular portion 233aA of the first lens 20A is bonded, the second light shielding portion 43A is bonded to the inclined portion 233bA of the first lens 20A, and the third light shielding portion 45A is bonded to the first lens The second annular portion 233cA of 20A is bonded. Thus, the light-shielding sheet 40 can be stably installed on the second lens 30A in a set manner.

In other modified embodiments, the size of the light-shielding sheet 40 can also be adjusted, such as the outer diameter, thickness, etc., and the light-shielding sheet 40 is arranged between the second lens 30 and the filter 50 to space the second lens 30 and filter 50 to achieve anti-glare effect. Moreover, when the position between the first lens 20 and the second lens 30 and the light shielding sheet 40 needs to be fixed at the same time, two flanges 415, 415A.

Since the lens module of the present invention is provided with a light-shielding sheet, and the light-shielding sheet has a first light-shielding portion, a second light-shielding portion, and a third light-shielding portion, it can absorb the light refracted to the first lower surface and the second upper surface, In this way, the glare phenomenon caused by the light being reflected to the image sensor (not shown in the figure) is avoided, and a clear image is ensured by the lens module.

In addition, the number of lenses and shading sheets included in the lens module can be adjusted accordingly according to actual needs, as long as it can prevent glare in the lens module while separating multiple lenses.

It should be pointed out that the above-mentioned embodiments are only preferred embodiments of the present invention, and those skilled in the art can also make other changes within the spirit of the present invention, which should be included within the scope of protection claimed by the present invention.

Claims (10)

1. camera lens module; It comprises from said camera lens module thing side to first eyeglass, anti-dazzling screen and second eyeglass that are arranged in order as side; Said first eyeglass comprises first optic and first support portion; Said first support portion is around the said first optic setting, and said first support portion comprises and is positioned at said first eyeglass as side and to first lower surface of said first eyeglass thing side sections depression, it is characterized in that; Said anti-dazzling screen comprises first light shielding part, second light shielding part and the 3rd light shielding part that connects successively; Said second light shielding part is the outward flange that frustum extends to said the 3rd light shielding part from the inward flange of said first light shielding part, and said the 3rd light shielding part and first light shielding part are concentric ring-shaped and are parallel to each other, and said anti-dazzling screen is used to coat said first lower surface.

2. camera lens module as claimed in claim 1 is characterized in that, said anti-dazzling screen adopts the light screening material with bending property to process.

3. camera lens module as claimed in claim 2 is characterized in that, the material of said anti-dazzling screen is coated with pitch-dark copper sheet for the surface.

4. camera lens module as claimed in claim 2 is characterized in that, the material of said anti-dazzling screen is black polyester.

5. camera lens module as claimed in claim 1 is characterized in that, said at least one anti-dazzling screen is mutually bonding with said first lower surface through glue.

6. camera lens module as claimed in claim 1 is characterized in that, the internal diameter of said second light shielding part diminishes along the direction away from said first light shielding part with respect to the central shaft of said first light shielding part gradually.

7. camera lens module as claimed in claim 1 is characterized in that, said the 3rd light shielding part edge second light shielding part width radially is less than said first light shielding part said first light shielding part in edge width radially.

8. camera lens module as claimed in claim 1 is characterized in that, the thickness of said anti-dazzling screen is 0.030mm ~ 0.054mm.

9. camera lens module as claimed in claim 1; It is characterized in that; Said first eyeglass comprises that from vertically extending first side of first lower surface outward flange of said first light shielding part is extended with a collar flange, the central shaft of parallel said first light shielding part of said collar flange along the direction away from the 3rd anti-dazzling screen; The internal diameter of said flange equals the external diameter of said first eyeglass, and said flange is used to be set in said first eyeglass outside.

10. camera lens module as claimed in claim 1; It is characterized in that; Said second eyeglass comprises one second side; The outward flange edge of said first light shielding part is extended with a collar flange near the direction of the central shaft of the 3rd anti-dazzling screen and parallel first light shielding part, and the internal diameter of said flange equals the external diameter of said second eyeglass, and said flange is used to be set in said second eyeglass outside.

Images