WO2022051997A1

WO2022051997A1 - Lens barrel, lens, and lens barrel manufacturing mold

Info

Publication number: WO2022051997A1
Application number: PCT/CN2020/114573
Authority: WO
Inventors: 邹海荣; 李明; 张刚强; 杨文明
Original assignee: 欧菲光集团股份有限公司; 南昌欧菲精密光学制品有限公司
Priority date: 2020-09-10
Filing date: 2020-09-10
Publication date: 2022-03-17

Abstract

The present application discloses a lens barrel, comprising a lens barrel body and a light blocking member. The light blocking member and the lens barrel body are separate structures, and the light blocking member is fixed at a light entrance hole of the lens barrel body. The light blocking member comprises a light blocking portion. The light blocking portion is annular and located in the light entrance hole, and surrounds and defines a light blocking hole. The diameter of the light blocking hole is less than the minimum inner diameter of the light entrance hole, and serves as an aperture diameter of the lens barrel. In the present application, the light blocking member having the light blocking hole is arranged at the light entrance hole, so as to shift the location at which the aperture is designed from the lens barrel body to the light blocking member, thereby solving the problem in which plastic at an aperture is too thin and thus results in molding difficulty during plastic injection molding of lens barrels. The present application further provides a lens and a lens barrel manufacturing mold.

Description

Lens barrel, lens and lens barrel making mold

technical field

The present application relates to the field of lens technology, in particular to a lens barrel, a lens and a lens barrel manufacturing mold.

Background technique

The lens barrel is a device that accommodates the lens in the lens, and the design of its light aperture is directly related to the shooting quality of the lens. In the actual lens production process, in order to achieve higher optical performance, the processing requirements for the light-passing hole are also very high, for example, the light-passing hole must not have burrs. The general lens barrels are plastic injection molded parts, and it is difficult to form due to the thin glue level, which affects the stability of the lens barrel production quality.

SUMMARY OF THE INVENTION

The present application provides a lens barrel. By arranging a light blocking member with a light blocking hole at the light entrance hole, the problem that the glue position at the light passing hole is too thin and difficult to form during plastic injection molding of the lens barrel is avoided.

In a first aspect, the present application provides a lens barrel including a lens barrel main body and a light blocking member, the light blocking member and the lens barrel main body are of a separate structure, and the light blocking member is fixed on the lens barrel main body. a light entrance hole, the light blocking member includes a light blocking part, the light blocking part is annular and is located in the light entrance hole, the area surrounded by the light blocking part is a light blocking hole, and the light blocking part is a light blocking hole. The aperture of the hole is smaller than the minimum inner diameter of the light entrance hole, and the aperture of the light blocking hole is the clear aperture of the lens barrel. The lens barrel in the embodiment includes a lens barrel main body and a light blocking member. The light blocking member is arranged at the light entrance hole of the lens barrel main body. For a circular hole, when the aperture of the circular hole is smaller than the minimum inner diameter of the light incident hole, the circular hole is a clear aperture, and the aperture of the circular hole is the clear aperture. Through the design of the light-blocking member, the light-passing hole that should have been injection-molded on the main body of the lens barrel is transformed into a light-blocking hole opened on the light-blocking member. In this way, it is possible to avoid specially designing the glue position of the light-passing hole in the injection molding process of the lens barrel body, and reduce the processing difficulty of the injection molding process of the lens barrel body. It should be noted that the axis of the light-blocking hole and the optical axis of the lens barrel body need to be collinear. Since the optical axis of the lens barrel body represents the optical axis of the lens housed in it, in order to make the light-blocking hole cooperate with the lens, then The axis of the light blocking hole needs to coincide with the optical axis of the lens barrel main body.

In a possible embodiment, the light blocking member further includes a positioning portion connected to the light blocking portion, the positioning portion is arranged around the outer side of the light blocking portion, and the lens barrel body is located on the outer side of the light blocking portion. The inner wall part at the light entrance hole is recessed to form a positioning groove, and the positioning portion is embedded in the positioning groove to fix the light blocking member to the lens barrel main body. Specifically in this embodiment, a positioning groove is provided on the inner wall of the lens barrel main body, and the positioning groove is used to accommodate the positioning portion of the light blocking member. Through the positioning groove, the fixed connection of the light blocking member on the light entrance hole can be realized. In actual operation, the position and height of the positioning groove can be changed to adjust the distance between the light hole and the lens housed in the main body of the lens barrel. distance.

In a possible embodiment, the light blocking member is an annular sheet, the positioning groove is an annular groove, and the positioning portion is accommodated in the positioning groove. The light blocking member in the embodiment is a circular ring sheet. At this time, the light blocking part and the positioning part are both circular, so that the outer ring edge of the light blocking part is connected to the inner ring edge of the positioning part, and the two form a large ring. For the annular sheet, the positioning groove designed on the inner wall of the light entrance hole is also an annular groove.

In a possible embodiment, the light blocking portion and the positioning portion are integrally formed. The integrally formed light blocking part and positioning part form a complete circular ring sheet. The light blocking part is designed as a large circular ring sheet, which belongs to the processing of regular structure, and the production cost is low and the efficiency is high. At the same time, the design of the circular ring sheet is convenient for size measurement. , the inner ring and the outer ring are concentric circles. Since the outer ring corresponds to the groove bottom surface of the positioning groove, it is only necessary to limit the size and position of the positioning groove to complete the axis of the light blocking hole on the light blocking member. The optical axes of the lens barrel bodies coincide.

In a possible embodiment, the thickness of the light blocking portion in the light path direction ranges from 0.01 to 0.03 mm. The thickness of the light blocking part is selected in the range of 0.01mm to 0.03mm, on the one hand, it can meet the needs of blocking light and avoid the penetration of incident light due to the thin light blocking part, and on the other hand, it can also realize the miniaturization design, and avoid the size is too thick. The compact design of the lens.

In a possible embodiment, the round hole on the object side of the light blocking member is a first round hole, the round hole on the image side face of the light blocking member is a second round hole, and the first hole diameter of the first round hole is smaller than The second aperture of the second circular hole, and the first aperture is a clear aperture. In the embodiment, the light blocking member has a certain thickness, and the sizes of the first circular hole located on the side of the object and the second circular hole located on the image side can have various dimensional relationships. The size of the aperture is the smallest of the two. In this embodiment, since the first aperture is smaller than the second aperture, the clear aperture is the first aperture of the first circular hole on the side of the object.

In a possible embodiment, the light blocking part includes two surfaces perpendicular to the light path direction, and the roughness of the surfaces ranges from VDI level 5 to level 24. Roughness VDI standard is a classification of product surface roughness. The grades selected here are relatively rough surfaces ranging from 5 to 24. The purpose is to reduce the reflection of light from the side of the light-blocking part and the image side.

In a possible embodiment, the positioning groove is provided at the minimum inner diameter of the light incident hole. In the embodiment, the inner wall of the main body of the lens barrel is usually not parallel to the optical axis, so the inner wall apertures at different positions of the inner wall are also different. Part of the light blocking part is blocked, resulting in secondary reflection of light, which affects the light passing through the light hole and reduces the imaging effect of the lens.

In a second aspect, the present application provides a lens, comprising a lens and the above-mentioned lens barrel, wherein the lens is fixed in a receiving space of the lens barrel. The lens in the embodiment adopts the above-mentioned lens barrel, and the design of the light blocking member avoids the glue position of the light-passing hole formed by direct injection molding, and reduces the manufacturing difficulty of the injection molding process.

In a third aspect, the present application provides a lens barrel manufacturing mold, comprising a light blocking member positioning insert, a cylindrical fixed side mold core and a cylindrical movable side mold core arranged oppositely, and a fixed side insert and a cylindrical movable side set oppositely arranged. Insert, the fixed side mold core is provided with a first through hole, the fixed side insert is located inside the first through hole, the movable side mold core is opened with a second through hole, and the movable side insert is located in the Inside the second through hole, the movable side insert opens a third through hole, the light blocking member positioning insert is located inside the third through hole, the first through hole, the second through hole and the The third through hole is coaxial, and the first positioning surface of the fixed-side insert is arranged opposite to the second positioning surface of the movable-side insert for sandwiching the light-blocking piece, which is positioned to locate the insert. The circular hole of the light blocking piece is penetrated by the piece, which is used for the positioning of the light blocking piece. The lens barrel manufacturing mold in the embodiment positions the light-blocking member in the axial direction through the fixed-side insert and the movable-side insert, and at the same time uses the light-blocking member positioning insert to ensure the light-blocking member on a plane perpendicular to the axis. Positioning, thereby determining the positional connection relationship between the light blocking member and the lens barrel main body.

In the lens barrel provided by the present application, a light blocking member with a light blocking hole is arranged at the light entrance hole, so that the design of the light passing hole is transferred from the lens barrel main body to the light blocking member, which avoids the need for plastic injection molding of the lens barrel. The problem that the glue position at the clear hole is too thin and difficult to form. At the same time, the present application also provides a lens including the lens barrel and a mold for making the lens barrel.

Description of drawings

1 is a cross-sectional view of a lens barrel in an embodiment of the present application;

Figure 2 is a schematic cross-sectional view along section line A-A in Figure 1;

Fig. 3 is a partial enlarged view at B in Fig. 1;

4 is a top view of a light blocking member in an embodiment of the present application;

Figure 5 is a schematic cross-sectional view along section line C-C in Figure 4;

6 is a top view of a light blocking member in another embodiment of the present application;

7 is a structural cross-sectional view of a lens barrel manufacturing mold in an embodiment of the present application;

FIG. 8 is a partial enlarged view at E in FIG. 7 .

detailed description

The specific embodiments of the present application will be clearly described below with reference to the accompanying drawings.

In the traditional lens manufacturing process, the lens barrel of the lens is usually formed by injection molding. However, such an injection molded lens barrel usually has a manufacturing difficulty, that is, how to form a thin glue position at the light entrance of the lens barrel through injection molding. of the light hole. The present application provides a lens barrel. By arranging a light blocking member at the light entrance, a light-passing hole that meets the requirements is formed, and the formation by the injection molding process is avoided.

Please refer to FIG. 1 to FIG. 4 together, which is a lens barrel 50 provided by the present application. The lens barrel 50 includes a lens barrel body 20 and a light blocking member 10 , and the light blocking member 10 is disposed at the entrance of the lens barrel body 20 . At the light hole 25, it can be seen from the figure that the lens barrel 50 further includes a receiving space 26. In the lens manufacturing process, it is usually necessary to fix a plurality of lenses in the receiving space 26 of the lens barrel 50. In the embodiment, the light blocking member 10 can be fixed to the light entrance hole 25 in a variety of ways, which may be fixed connection methods such as bonding, embedding, etc. Specifically, the embedding method is adopted in this embodiment. In FIG. 2 , the light blocking member 10 is a sheet-like structure with a light blocking hole 15 in the central area. With reference to FIGS. 1 and 5 , the axis Y of the light blocking hole 15 is collinear with the optical axis X of the lens barrel main body 20 , and the light blocking hole The aperture d1 of 15 is smaller than the minimum inner diameter D2 of the light entrance hole 25. Here, the inner diameter D1 of the light entrance hole 25 varies, and the inner diameter D1 will be different at different positions of the light entrance hole 25. The minimum inner diameter is D2. 10, the minimum inner diameter D2 is the clear aperture of injection molding, but here, through the design of the light blocking member 10, the aperture of the light blocking hole 15 surrounded by the light blocking part 11 is smaller than the minimum inner diameter D2 of the light entrance hole 25 , at this time, the aperture d1 of the light blocking hole 15 is the clear aperture of the lens barrel 20 . The lens barrel 50 in the embodiment includes two parts: the lens barrel main body 20 and the light blocking member 10. The light blocking member 10 is embedded in the light entrance hole 25 of the lens barrel main body 20. Through the design of the light blocking member 10, The light-passing hole that should be formed in the lens barrel main body 20 is converted into the light-blocking hole 15 opened on the light-blocking member 10 , and the light-blocking hole 15 here is the light-passing hole of the entire lens barrel 50 . This design can avoid specially designing the glue position of the light-passing hole in the injection molding process of the lens barrel main body 20 , and reduce the processing difficulty of the injection molding process of the lens barrel main body 20 . It should be noted that the axis Y of the light-blocking hole 15 and the optical axis X of the lens barrel main body 20 need to be collinear. The light-blocking hole 15 of the light-transmitting hole is matched with the lens, and the axis Y of the light-blocking hole 15 needs to coincide with the optical axis X of the lens barrel main body 20 . For the convenience of description, the optical path direction in the following embodiments coincides with the extending direction of the optical axis X, and at the same time, the extending direction of the optical axis X is also the opening direction of the mold.

Further, as shown in FIGS. 1 to 4 , the inner wall 21 of the lens barrel body 20 at the light entrance hole 25 is partially recessed to form a positioning groove (not shown in the figure), and the light blocking member 10 includes interconnected light blocking portions 11 and the positioning part 12, the positioning part 12 is arranged on the outer side of the light blocking part 11, the light blocking part 11 has a circular hole as the light blocking hole 15, the positioning part 12 is embedded in the positioning groove, and the light blocking part 10 is fixed to the mirror barrel body. Specifically, in this embodiment, a positioning groove is provided inside the light incident hole, and the positioning groove is used to accommodate the positioning portion 12 of the light blocking member 10 . Through the positioning groove, the fixed connection of the light blocking member 10 at the light entrance hole 25 can be realized. In actual operation, changing the position and height of the positioning groove can adjust the light through hole (light blocking hole 15 ) and accommodate it in The distance between the lenses inside the barrel body 20 .

It should be noted here that, in the specific embodiment, since the lens barrel body 20 is formed by injection molding, when manufacturing the lens barrel body 20 , it is only necessary to set the light blocking member 10 at a predetermined position, and then go through the injection molding process. , the light blocking member 10 can be fixed at the corresponding position of the lens barrel main body 20 , that is, the light entrance hole 25 . By using this method, it is avoided to separately form a positioning groove on the inner wall 21 of the lens barrel main body 20 , which saves the manufacturing cost.

In a specific embodiment, as shown in FIG. 1 to FIG. 4 , the light blocking part 11 and the positioning part 12 are both annular sheets, and the outer ring edge of the light blocking part 11 is connected to the inner ring edge of the positioning part 12 . Correspondingly, as shown in Fig. 2, the positioning groove (not shown in the figure) is an annular groove, and the positioning portion 12 is accommodated in the positioning groove. The light-blocking portion 11 and the positioning portion 12 in the embodiment are both annular sheets, and the outer ring edge of the light-blocking portion 11 is connected to the inner ring edge of the positioning portion 12, and the two form a large annular sheet. The positioning groove on the inner wall 21 of the light incident hole 25 is also an annular groove. Specifically, the light blocking portion 11 and the positioning portion 12 in the embodiment are integrally formed. The integrally formed light blocking portion 11 and the positioning portion 12 form a complete annular sheet, and the light blocking member 10 is designed as a large annular sheet, which belongs to the processing of a regular structure, with low production cost and high efficiency. At the same time, the design of the annular sheet It is convenient for size measurement. The inner ring and the outer ring are concentric circles. Since the outer ring corresponds to the groove bottom surface of the positioning groove, it is only necessary to limit the size and position of the positioning groove to complete the light blocking on the light blocking member 10. The axis Y of the hole 15 coincides with the optical axis X of the lens barrel main body 20 .

In another specific embodiment, as shown in FIG. 6 , the light-blocking portion 11 is a circular ring sheet, and the positioning portion 12 disposed on its periphery is a square hollow sheet. The light-blocking member 10 formed by the combination of the two is A square sheet is provided with a light-blocking hole 15 at the center of the sheet, and the light-blocking hole 15 is the light-passing hole of the entire lens barrel. Different from the light blocking member 10 in the embodiment shown in FIG. 4 , which is a circular ring sheet, the difference between the two lies in the difference of the positioning portion 12 . For different embodiments, the shape design of the positioning portion 12 can meet the requirements of the present invention. According to the needs of the application, the choice of the specific shape can be determined according to the actual needs.

In a specific embodiment, as shown in FIG. 5 , the thickness d6 of the light blocking portion 11 in the optical path direction (the extension direction of the optical axis X) is in the range of 0.01-0.03 mm. The thickness d6 of the light-blocking portion 11 is selected in the range of 0.01mm to 0.03mm. On the one hand, it can meet the needs of light-blocking and avoid the incident light penetration due to the light-blocking portion 11 being too thin. Thickness is not conducive to the miniaturized design of the lens. In a specific embodiment, since the light blocking portion 11 and the positioning portion 12 are integrally formed into the light blocking member 10 , the thickness d6 of the light blocking portion 11 is the thickness d6 of the light blocking member 10 .

In a specific embodiment, as shown in FIGS. 3 to 5 , the round hole on the object side 13 of the light blocking member 10 is the first round hole, and the round hole on the image side 14 of the light blocking member 10 is the second round hole , the first aperture d4 of the first circular hole is smaller than the second aperture d5 of the second circular hole, and the first aperture d4 is the clear aperture 15 . In the embodiment, the light blocking member 10 has a certain thickness d6, and the sizes of the first circular hole located on the object side 13 and the second circular hole located on the image side 14 can have various dimensional relationships. In other words, the size of the clear aperture 15 takes the minimum value. In this embodiment, since the first aperture d4 is smaller than the second aperture d5, the clear aperture 15 is the first aperture of the first circular hole on the object side surface 13. d4. In other embodiments, if the first aperture d4 is larger than the second aperture d5 , then the clear aperture 15 is the second aperture d5 of the second circular hole on the image side 14 .

In a specific embodiment, as shown in FIG. 3 , the roughness VDI level of the surfaces on both sides of the light blocking portion 11 ranges from level 5 to level 24. Roughness VDI standard is a classification of product surface roughness (Charmilles fire pattern roughness). To reduce the reflection effect of the surface, the design purpose here is to reduce the reflection of light from the object side and the image side of the light blocking part 11 .

In a specific embodiment, as shown in FIGS. 1 to 3 , the diameter of the inner wall 21 on a plane perpendicular to the optical axis X is the inner wall aperture D1, and the positioning groove (not shown in the figure) is provided in the inner wall aperture D1 minimum location. In the embodiment, the minimum aperture of the light entrance hole 25 is the minimum inner wall aperture D1 of the inner wall. Since the inner wall 21 is usually not parallel to the optical axis, the inner wall aperture at different positions of the inner wall 21 is also different. If the positioning groove is not set to the inner wall aperture At the position where D1 is the smallest, that is, at the inner wall aperture D2, the position on the inner wall 21 with the smallest inner wall aperture will partially block the light blocking portion 11, thereby causing secondary reflection of light, affecting the light passing through the light blocking hole and reducing the impact on the lens. imaging effect.

In a second aspect, the present application further provides a lens, the lens includes a lens and the above-mentioned lens barrel, and the lens is fixed in a receiving space of the lens barrel. The lens in the embodiment adopts the above-mentioned lens barrel, and the design of the light blocking member avoids the glue position of the light-passing hole formed by direct injection molding, and reduces the manufacturing difficulty of the injection molding process.

In the third aspect, as shown in FIG. 7 and FIG. 8 , the present application provides a lens barrel manufacturing mold 100 , which includes a lens barrel manufacturing mold 100 , a light blocking member positioning insert 80 , and a cylindrical fixed side mold core 61 arranged oppositely. With the cylindrical movable side die 62, the fixed side insert 71 and the cylindrical movable side insert 72, the fixed side die 61 is provided with a first through hole (not shown in the figure), and the fixed side insert 71 Located inside the first through hole, the movable side mold core 62 has a second through hole (not shown in the figure), the movable side insert 72 is located inside the second through hole, and the movable side insert 72 has a third through hole (in the figure). (not shown), the light blocking member positioning insert 80 is located inside the third through hole, the first through hole, the second through hole and the third through hole have the same axis Z, and the light blocking member 10 is sandwiched between the fixed side inserts 71 and Between the movable side inserts 72 , the object side 13 of the light blocking member 10 is attached to the first positioning surface 715 of the fixed side insert 71 in the mold opening direction (the extension direction of the optical axis X), and the image of the light blocking member 10 is The side 14 is attached to the second positioning surface 725 of the movable side insert 72 in the mold opening direction (the extension direction of the optical axis X). The hole 15 is sleeved on the outer wall 85 of the light blocking member positioning insert 80 . The lens barrel manufacturing mold 100 in the embodiment positions the light blocking member 10 in the direction of the optical axis X through the fixed side inserts 71 and the movable side inserts 72, and at the same time uses the light blocking member positioning inserts 80 to ensure the light blocking member 10. The positioning on the plane perpendicular to the axis Z further determines the positional connection relationship between the light blocking member 10 and the lens barrel main body 20 .

In the specific production process, prepare a light blocking piece with a size that meets the needs in advance, put it into the corresponding position of the lens barrel manufacturing mold, and use the fixed side insert, the movable side insert and the light blocking piece positioning insert to block the light block. The optical part is positioned and then injected into the mold, thus completing the positional fixation of the light blocking part at the light entrance hole of the lens barrel. In this embodiment, it is not necessary to set a positioning groove for the light blocking member at the light entrance of the lens barrel, because the light blocking member itself is located at the corresponding light entrance hole position. When the injection molding process is completed, the light blocking member is naturally completed. Positioning work.

The embodiments of the present application have been introduced in detail above, and the principles and implementations of the present application are described in this paper using specific examples. The descriptions of the above embodiments are only used to help understand the methods and core ideas of the present application; at the same time, for the present application Persons of ordinary skill in the art, based on the idea of the present application, may have changes in the specific implementation manner and application scope. In conclusion, the contents of this specification should not be construed as a limitation on the present application.

Claims

A lens barrel, characterized in that it comprises a lens barrel main body and a light blocking member, the light blocking member and the lens barrel main body are of a separate structure, and the light blocking member is fixed on the incoming light of the lens barrel main body The light-blocking member includes a light-blocking portion, the area surrounded by the light-blocking portion is a light-blocking hole, and the aperture of the light-blocking hole is smaller than the minimum inner diameter of the light-incident hole. The aperture is the clear aperture of the lens barrel.
The lens barrel according to claim 1, wherein the light blocking member further comprises a positioning portion connected with the light blocking portion, the positioning portion is arranged around the outer side of the light blocking portion, and the mirror The inner wall part of the barrel body at the light incident hole is recessed to form a positioning groove, and the positioning portion is embedded in the positioning groove to fix the light blocking member to the lens barrel body.
The lens barrel according to claim 2, wherein the light blocking member is a circular ring sheet, and the positioning groove is an annular positioning groove.
The lens barrel of claim 2, wherein the light blocking portion and the positioning portion are integrally formed.
The lens barrel according to claim 1, wherein the thickness of the light blocking portion in the light path direction ranges from 0.01 mm to 0.03 mm.
The lens barrel according to claim 1, wherein the opening on the object side of the light blocking member is a first round hole, the opening on the image side of the light blocking member is a second round hole, and the The first aperture of the first circular hole is smaller than the second aperture of the second circular hole, and the first aperture is a clear aperture.
The lens barrel of claim 1, wherein the light blocking portion comprises two surfaces perpendicular to the optical path direction, and the surface roughness VDI level ranges from 5 to 24.
The lens barrel according to claim 2, wherein the positioning groove is provided at the minimum inner diameter of the light incident hole.
A lens is characterized in that it comprises a lens and the lens barrel according to any one of claims 1 to 8, wherein the lens is fixed in the accommodation space of the lens barrel.
A lens barrel manufacturing mold is characterized in that it comprises a light blocking part positioning insert, a cylindrical fixed side mold core and a cylindrical movable side mold core arranged oppositely, a fixed side insert and a cylindrical movable side insert arranged oppositely, The fixed side mold core has a first through hole, the fixed side insert is located inside the first through hole, the movable side mold core has a second through hole, and the movable side insert is located in the first through hole. Inside the two through holes, the movable side insert defines a third through hole, the light blocking member positioning insert is located inside the third through hole, the first through hole, the second through hole and the The third through hole is coaxial, and the first positioning surface of the fixed side insert in the mold opening direction is opposite to the second positioning surface of the movable side insert in the mold opening direction, for clamping the stopper A light blocker, wherein the light blocker positioning insert penetrates the light blocker hole of the light blocker, and is used for the positioning of the light blocker.