Optical lens module

Provided is an optical lens module including a lens barrel, a lens assembly and a press ring, the lens barrel has an object side end surface, the lens assembly includes a first lens and a second lens, the first lens is a plastic lens including an imaging portion and a fixing portion around the imaging portion, the imaging portion extends towards and beyond an object side, the second lens is located in the lens barrel. The press ring includes an inner side surface and an outer side surface, the inner side surface is fixed with the fixing portion, the outer side surface is connected with the lens barrel, the press ring abuts against an object side surface of the second lens. In this optical lens module, head size of the optical lens module is no longer limited by wall thickness of the lens barrel, thereby greatly reducing head size.

TECHNICAL FIELD

The present invention relates to the field of optical imaging technology and, in particular, to an optical lens.

BACKGROUND

Nowadays, an optical lens module has been widely used in various electronic products, such as mobile phones and tablets. With development of camera technology and increasing demand for the electronic products, the optical lens module is becoming more and more miniaturized.

In spite of this, many optical lens modules are still limited by the size of the lens and the wall thickness of the lens barrel, which cannot meet design requirements for miniaturization of the head portion of the optical lens module.

Therefore, it is necessary to provide an optical lens module to solve the above technical problems.

SUMMARY

An object of the present invention is to provide an optical lens module, which aims to solve the problem of a relatively large size of the head of the conventional optical lens module.

An optical lens module, including:

a lens barrel comprising an object side end surface;

a lens assembly comprising a first lens and a second lens disposed on an image side of the first lens, the first lens being a plastic lens and comprising an imaging portion and a fixing portion surrounding the imaging portion, the imaging portion extending towards an object side and protruding from the object side end surface, and the second lens being located in the lens barrel; and

a press ring comprising an outer side surface and an inner side surface arranged opposite to the outer side surface, the outer side surface being connected to the lens barrel, the inner side surface being fixed to the fixing portion, and the press ring abutting against an object side surface of the second lens.

In an embodiment, a adhesive receiving groove is provided between the inner side surface and the fixing portion, and the inner side surface is adhered and fixed to the fixing portion.

In an embodiment, the imaging portion comprises a first curved surface and a second curved surface that is bent and extends from the first curved surface, and in a direction from an object side to an image side, a generatrix of the second curved surface is inclined in a direction facing away from an optical axis of the optical lens module.

In an embodiment, an image side surface of the fixing portion comprises a first horizontal surface and a first inclined surface obliquely extending from the first horizontal surface towards the image side, an object side surface of the second lens comprises a second horizontal surface and a second inclined surface obliquely extending from the second horizontal surface towards the image side, the first horizontal surface abuts against the second horizontal surface, and the first inclined surface abuts against the second inclined surface.

In an embodiment, the outer side surface is adhered and fixed to the lens barrel.

In an embodiment, the lens assembly further comprises a third lens and a first light-shielding sheet, the third lens is provided on an image side of the second lens, an outer diameter of the third lens is smaller than an outer diameter of the second lens, and the first light-shielding sheet is disposed between the second lens and the third lens.

In an embodiment, an image side surface of the second lens comprises a third horizontal surface, a third inclined surface connected to the third horizontal surface and a first bearing surface connected to the third inclined surface, the third inclined surface extends obliquely from the third horizontal surface towards the image side, an object side surface of the third lens comprises a fourth horizontal surface, a fourth inclined surface connected to the fourth horizontal surface and a second bearing surface connected to the fourth inclined surface, the fourth inclined surface extends obliquely from the fourth horizontal surface towards the image side, the third horizontal surface abuts against the fourth horizontal surface, the third inclined surface abuts against the fourth inclined surface, and the first light-shielding sheet is sandwiched between the first bearing surface and the second bearing surface.

In an embodiment, the lens assembly further comprises a fourth lens and a fifth lens, and the third lens, the fourth lens and the fifth lens are sequentially arranged in the direction from the object side to the image side, and outer diameters of the third lens, the fourth lens and the fifth lens gradually decrease.

In an embodiment, the lens barrel further comprises a bearing portion extending from an end close to the image side towards an optical axis of the optical lens module, and a lens in the lens assembly closest to the image side rests on the bearing portion.

In an embodiment, the second lens is a plastic lens.

The beneficial effects of the present invention lie in:

In the above optical lens module, the imaging portion of the first lens extends towards the object side and protrudes from the object side end surface of the lens barrel. In other words, a partial structure of the first lens is located outside the lens barrel. Therefore, a size of the partial structure of the first lens located outside the lens barrel determines a head size of the entire optical lens module, and the head size of the optical lens module is no longer limited by a wall thickness of the lens barrel, thereby greatly reducing the head size.

DESCRIPTION OF EMBODIMENTS

The present invention will be further illustrated with reference to the accompanying drawings and the embodiments.

As shown inFIGS. 1 and 2, an optical lens module according to an embodiment can be applied to electronic products such as mobile phones and tablets, and the optical lens module includes a lens barrel100and a lens assembly200. The lens barrel100, as a main mounting structure of the lens assembly200, may be a circular barrel or a square barrel.

The lens barrel100includes a bearing portion110and a sidewall120. An end of the sidewall120close to an object side is open and has an object side end surface122, and the object side end surface122is a plane perpendicular to an optical axis10of the optical lens module. The bearing portion110is provided at an end of the sidewall120close to an image side and extends from the sidewall120along a direction of the optical axis10. The bearing portion110is connected to the sidewall120to form a receiving cavity102. A surface of the sidewall120close to the receiving cavity102is a multi-stage stepped surface124, and an inner diameter of the stepped surface124gradually increases along a direction from the object side to the image side.

The lens assembly200includes a plurality of lenses sequentially arranged along the direction from the object side to the image side, the plurality of lenses are respectively a first lens210, a second lens220, a third lens230, a fourth lens240, and a fifth lens250. In other words, in the present embodiment, the lens assembly200includes 5 lenses in total. An outer diameter of the first lens210is smaller than an outer diameter of the second lens220. The outer diameter of the second lens220, an outer diameter of the third lens230, an outer diameter of the fourth lens240, and an outer diameter of the fifth lens250gradually decrease. Therefore, it is not difficult to understand that, among the plurality of lenses, the first lens210is closest to the object side, the fifth lens250is closest to the image side, and the second lens220has the largest outer diameter.

Moreover, the second lens220, the third lens230, the fourth lens240and the fifth lens250are all disposed in the receiving cavity102, and an image side surface of the fifth lens250rests on the bearing portion110. The outer diameters of the lenses are adapted to the inner diameter of the corresponding stepped surface124, so that these lenses can be prevented from shifting in a direction perpendicular to the optical axis10.

Referring toFIG. 1, the first lens210includes an imaging portion212and a fixing portion214surrounding the imaging portion212, the imaging portion212extends along a direction towards the object side and extends beyond the object side end surface122. In other words, a partial structure of the first lens210is located outside the lens barrel100. Therefore, a size A1 of the partial structure of the first lens210located outside the lens barrel100determines a head size of the entire optical lens module, and the head size of the optical lens module is no longer limited by a wall thickness of the lens barrel100, such that the head size can be greatly reduced. However, in a conventional optical lens module shown inFIG. 7, a lens assembly200ais completely received in a lens barrel100a, a head size A2 of an optical lens module is equal to a sum of a size of a first lens210aand a wall thickness of the lens barrel100a. Moreover, for the first lens210aof different models, the lens barrel100aalso needs to be adaptively resized to fit the first lens210a, which will also increase production cost of the conventional optical lens module.

As shown inFIG. 3, in an embodiment, the imaging unit212includes a first curved surface2122and a second curved surface2124bent from the first curved surface2122. In the direction from the object side to the image side, a generatrix of the second curved surface2124is inclined towards a direction facing away from the optical axis10. In other words, that is, in the direction from the object side to the image side, a distance between the second curved surface2124and the optical axis10gradually increases. Since the first lens210is a plastic lens and is manufactured by an injection molding process, such design of the second curved surface2124can facilitate demoulding of the first lens210.

In addition, in the present embodiment, the second lens220, the third lens230, the fourth lens240, and the fifth lens250are also plastic lenses.

In an embodiment, the first lens210and the second lens220are fitted by bumpy ridges. Specifically, referring toFIGS. 3-4, an image side surface of the fixing portion214includes a first horizontal surface2142and a first inclined surface2144extending obliquely from the first horizontal surface2142in a direction towards the image side, and the first inclined surface2144is inclined towards a direction close to the optical axis10. An object side surface of the second lens220includes a second horizontal surface222and a second inclined surface224extending obliquely from the second horizontal surface222in the direction towards the image side, and the second inclined surface is inclined towards the direction close to the optical axis10. The first horizontal surface2142abuts against the second horizontal surface222, and the first inclined surface2144abuts against the second inclined surface224.

Further, the second lens220and the third lens230are also fitted by bumpy ridges. Specifically, referring toFIGS. 4-5, an image side surface of the second lens220includes a third horizontal surface221, a third inclined surface223and a first bearing surface225that are connected in sequence. The third inclined surface223extends obliquely from the third horizontal surface221in the direction towards the image side, the third inclined surface223is inclined towards the direction close to the optical axis10, and the first bearing surface225is parallel to the third horizontal surface221. An object side surface of the third lens230includes a fourth horizontal surface231, a fourth inclined surface233and a second bearing surface235that are connected in sequence. The fourth inclined surface233extends obliquely from the fourth horizontal surface231in the direction towards the image side, the fourth inclined surface233is inclined towards the direction close to the optical axis10, and the second bearing surface235is parallel to the fourth horizontal surface231. The third horizontal surface221abuts against the fourth horizontal surface231, the third inclined surface223abuts against the fourth inclined surface233, and the first bearing surface225is arranged opposite to the second bearing surface235.

In an present embodiment, referring toFIG. 1, the lens assembly200further includes a first light-shielding sheet260, a second light-shielding sheet270and a third light-shielding sheet280, and the first light-shielding sheet260is disposed between the second lens220and the third lens230. More specifically, the first light-shielding sheet260is sandwiched between the first bearing surface225and the second bearing surface235. The second light-shielding sheet270is disposed between the third lens230and the fourth lens240, and the third light-shielding sheet280is disposed between the fourth lens240and the fifth lens250. These light-shielding sheets all have the function of blocking stray light, so as to avoid the stray light from entering an imaging area and affecting the imaging quality.

In the present embodiment, the first light-shielding sheet260, the second light-shielding sheet270, and the third light-shielding sheet280are all made of a black plastic material by injection molding, in order to improve dimensional accuracy, such that an effect of blocking the stray light will not be reduced or effective imaging light will not be blocked too much to affect the imaging quality due to manufacturing errors. In other embodiments, these light-shielding sheets can also be made of a black thin-film by stamping.

As shown inFIGS. 1 and 6, the optical lens module further includes a press ring300disposed in the receiving cavity102, and the press ring300includes an outer side surface310and an inner side surface320that are oppositely arranged in a direction perpendicular to the optical axis. The outer side surface310is connected to a surface of the sidewall120close to the receiving cavity102so as to realize connection between the press ring300and the lens barrel100, and the inner side surface320is connected to the fixing portion214to realize connection between the press ring300and the first lens210, so that the press ring300achieves the purpose of fixing the first lens210on the lens barrel100. In addition, the press ring300also abuts against the object side surface of the second lens220, and specifically, in the present embodiment, the side of the press ring300close to an image side abuts against the second horizontal surface222, so that the press ring300can also fit to the bearing portion110to achieve the purpose of fixing the second lens220, the third lens230, the fourth lens240and the fifth lens250on the lens barrel100.

In an embodiment, the outer side surface310and the lens barrel100are glued and fixed by glue dispensing, Specifically, the fixing portion214has a side surface2145arranged opposite to the inner side surface320in a direction perpendicular to the optical axis, an adhesive receiving groove106is provided between the inner side surface320and the side surface2145, and the glue connection and fixing of the two are achieved by dispensing glue in the adhesive receiving groove106. It can be understood that, in other embodiments, the press ring300may also be connected to the sidewall120by thread connection, which is not limited herein.

When assembling the optical lens module of the present invention, the fifth lens250, the fourth lens240, the third lens230, the second lens220, and the first lens210are assembled in sequence on the lens barrel100along the direction from the image side to the object side, and finally the fixing of the lens assembly200is achieved by the press ring300.

In addition, it should be noted that the number of the lenses included in the lens assembly200is not limited to the embodiment shown inFIG. 1, and the number of the lenses may be 2, 3, 4, 6 or more.

It should be noted that, the above are merely embodiments of the present invention, those skilled in the art can make improvements without departing from the inventive concept of the present invention, however, these improvements shall belong to the protection scope of the present invention.