CN103163582A - Glass optical lens and lens module using the same - Google Patents

Abstract

The invention provides a glass optical lens which comprises an object side face and an image side face opposite to the object side face, wherein the object side face and the image side face are used for enabling light rays entering through the object side face to be converged or diverged and exit from the image side face. The glass optical lens is made of glass base materials capable of absorbing infrared rays, and used for absorbing the infrared rays of the light rays passing through the glass optical lens. The glass optical lens is made of the materials capable of absorbing the infrared rays to absorb the infrared rays passing through the lens, and therefore other optical elements used for filtering the infrared rays do not need to be extra arranged in a lens module, the size of the lens module is reduced, and producing cost of the lens module is further reduced. The invention further provides a lens module using the glass optical lens.

Description

Glass lens and lens module using the glass lens

technical field

The invention relates to a lens, in particular to a glass lens capable of absorbing infrared rays and a lens module using the glass lens.

Background technique

A traditional lens module includes a lens barrel, at least one lens and a filter assembled in the lens barrel, and the shading sheet is adjacent to the lens. The optical filter is used to filter out infrared light in the light passing through the lens and only allow visible light with a wavelength of 420nm-680nm to pass through. In addition to the traditional function of filtering out infrared light, the filter does not have the function of converging and diverging light like a lens. The optical filter located in the lens module not only increases the volume of the lens module, but also increases the production cost of the lens module.

Contents of the invention

In view of this, it is necessary to provide a glass lens capable of absorbing infrared rays and a lens module using the glass lens.

A glass lens, which includes an object side and an image side opposite to the object side, used to converge or diverge light entering through the object side and exit from the image side; the glass lens is made of glass capable of absorbing infrared rays The substrate is made to absorb infrared rays from the light passing through the glass lens.

A lens module, which includes a lens barrel and at least one glass lens accommodated in the lens barrel; the glass lens includes an object side and an image side opposite to the object side; light projected to the object side After being converged or diverged by the glass lens, it is projected from the side of the image; the glass lens is made of a material capable of absorbing infrared light, so as to absorb the infrared light in the light passing through the glass lens.

The glass lens in the lens module provided by the present invention is made of a material capable of absorbing infrared light, so as to absorb the infrared light in the light passing through the glass lens, so that the lens module does not need to be additionally equipped with other optical elements for filtering infrared light , thus only reducing the volume of the lens module and also reducing the production cost of the lens module.

Description of drawings

FIG. 1 is a schematic structural diagram of a lens module provided by an embodiment of the present invention.

FIG. 2 is a schematic structural diagram of the glass lens in FIG. 1 .

Description of main component symbols

Lens module 100 lens barrel 10 object side 11 image side 12 Accommodating space 13 Glass lenses 20 object side twenty one like the side twenty two Anti-reflection film twenty three Infrared filter film twenty four image sensor 40 imaging surface 41

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

Detailed ways

As shown in FIGS. 1-2 , a lens module 100 provided in an embodiment of the present invention includes a lens barrel 10 , at least one glass lens 20 and an image sensor 40 .

The lens barrel 10 is cylindrical and includes a semi-enclosed object side 11 , an unenclosed image side 12 and an accommodating space 13 communicating with the object side 11 and the image side 12 .

The at least one glass lens 20 is accommodated in the accommodating space 13 . The glass lens 20 includes an object side 21 facing the object side 11 and an image side 22 facing the image side 12 , at least one of the object side 21 and the image side 22 has a non-zero curvature. The light projected to the object side 21 is projected from the image side 22 after being converged or diverged by the glass lens 20 . The glass lens 20 is molded by a glass substrate capable of absorbing infrared rays. In this embodiment, the raw material composition of the glass substrate includes, by weight percentage, 40-75% of P ₂ O ₅ , 10-28 % Al ₂ O ₃ , 3~8.5% CuO and 0~5% B ₂ O ₃ , the total content of P ₂ O ₅ and Al ₂ O ₃ is preferably more than 70%. It can be understood that the glass substrate may also be composed of other materials or weights, but the glass substrate has a better absorption effect on infrared rays.

In this embodiment, the lens module 100 includes two glass lenses 20, and the glass lenses 20 may be spherical lenses or aspherical lenses. The two glass lenses 20 are sequentially arranged in the lens barrel 10 along the light incident direction, wherein one glass lens 20 is arranged adjacent to the object side 11 of the lens barrel 10, and the other glass lens 20 is arranged adjacent to the image side 12 of the lens barrel 10 , the glass lens 20 disposed adjacent to the image side 12 is made of a glass substrate capable of absorbing infrared rays. When the lens module 100 includes a plurality of glass lenses 20, preferably the glass lens 20 closest to the image side 12 is made of a glass substrate that absorbs infrared light, and the other glass lenses 20 are made of common materials in order to save costs.

In this embodiment, the object side 21 of the glass lens 20 is coated with a layer of the antireflection film 23 , and the image side 22 is coated with an infrared filter film 24 . The anti-reflection film 23 is used to enhance the penetration of the light projected to the object side 21 , and the infrared filter film 24 is used to further filter out the infrared light in the light passing through the glass lens 20 . It can be understood that on the object side 21 or the image side 22 of the glass lens 20, other film layers, for example, an ultraviolet filter film, can also be coated. Compared with the traditional infrared filter film 24 , the infrared filter film 24 in this embodiment can filter out light of a certain wavelength in a more targeted manner.

The image sensor 40 is disposed at the image end 12 of the lens barrel 10 and closes the image end 12 . The image sensor 40 includes an imaging surface 41 for converting light projected onto its surface into electrical signals. There is no optical element with a curvature radius of 0, such as a filter, between the image side 22 and the imaging surface 41 . In this embodiment, the optical element with a curvature radius of 0 includes an optical element in which one surface has a curvature radius of 0 and both surfaces have a curvature radius of 0.

During use, light entering from the object side 11 of the lens barrel 10 is projected to the object side 21 of the glass lens 20 . Since the anti-reflection film 23 coated on the object side surface 21 enhances the penetration of light, the light reflected by the glass lens 20 is reduced and the generation of glare is prevented. When the light passes through the glass lens 20, due to its function of absorbing infrared light, the infrared part of the light is effectively filtered, and compared with the traditional filter, the generation of reflected infrared light is reduced. When the light passes through the infrared filter film 24 , the infrared filter film 24 further filters out the infrared light in the light after passing through the glass lens 20 . The light converged or diverged by the glass lens 20 is finally projected on the imaging surface 41 of the image sensor 40 .

The glass lens in the lens module provided by the present invention is made of a material capable of absorbing infrared light, so as to absorb the infrared light in the light passing through the glass lens, so that the lens module does not need to be additionally equipped with other optical elements for filtering infrared light , thus only reducing the volume of the lens module and also reducing the production cost of the lens module.

It can be understood that, for those skilled in the art, various other corresponding changes and deformations can be made according to the technical concept of the present invention, and all these changes and deformations should belong to the protection scope of the claims of the present invention .

Claims (7)

1. glass mirror, it comprises a thing side and a picture side relative with this thing side, is used for making the convergence of rays that enters through this thing side or disperses and from picture side outgoing; This glass mirror is made by the glass baseplate that can absorb Infrared, is used for absorbing the Infrared by the light of this glass mirror.

2. glass mirror as claimed in claim 1, it is characterized in that: the feedstock composition of described glass baseplate comprises 40 ~ 75% P by weight percentage ₂O ₅, 10 ~ 28% Al ₂O ₃And 3 ~ 8.5% CuO.

3. eyeglass as claimed in claim 2, is characterized in that: also comprise 0 ~ 5% B in the feedstock composition of described glass baseplate ₂O ₃

4. camera lens module, it comprises a lens barrel and at least one glass mirror that is housed in this lens barrel; Described glass mirror comprises a thing side and a picture side relative with this thing side; The light that is projected to this thing side through the convergence of this glass mirror or after dispersing from throwing away as the side; This glass mirror adopts the material that can absorb Infrared to make, to absorb by the Infrared in the light of this glass mirror.

5. camera lens module as claimed in claim 4, it is characterized in that: the feedstock composition of described glass baseplate comprises 40 ~ 75% P by weight percentage ₂O ₅, 10 ~ 28% Al ₂O ₃And 3 ~ 8.5% CuO.

6. camera lens module as claimed in claim 5, is characterized in that: also comprise 0 ~ 5% B in the feedstock composition of described glass baseplate ₂O ₃

7. camera lens module as claimed in claim 4 is characterized in that: the described image formation by rays that throws away as the side from glass mirror is in an imaging surface, and not having radius-of-curvature between described picture side and imaging surface is 0 optical element.