CN220188781U

CN220188781U - Lens group

Info

Publication number: CN220188781U
Application number: CN202321575890.XU
Authority: CN
Inventors: 梁世音; 陈俊贤
Original assignee: Yirui Industrial Co ltd
Current assignee: Yirui Industrial Co ltd
Priority date: 2022-07-29
Filing date: 2023-06-20
Publication date: 2023-12-15
Anticipated expiration: 2033-06-20
Also published as: TWM637087U

Abstract

The utility model discloses a lens group, which comprises a first lens, a second lens and a plurality of fusion bonding parts. The second lens is connected with the first lens, wherein an annular gap is formed between the first lens and the second lens. The fusion bonding portion is positioned in the interface annular slit and is adjacent to the peripheral side walls of the first lens and the second lens. According to the lens group disclosed by the utility model, the strength of the whole lens group at the joint can be close to the strength of the lens by using the remolding method of melting and solidifying the lens material instead of the adhesiveness of the external materials such as glue, so that the safety and durability of the lens can be effectively improved, and offset misalignment between the two lenses caused by collision or vibration of the lens group in use can be reduced.

Description

Lens group

Technical Field

The present utility model relates to a lens assembly, and more particularly to a lens assembly composed of a plurality of lenses.

Background

Currently, the lens for vehicles has been increasingly used for various devices on vehicles, such as a reverse display, a driving recorder, or a self-driving vehicle. The automotive lens is primarily considered to be safe and durable, so that the general lens is made of glass because of being capable of bearing higher temperature and not easy to deform than plastic, and the lens is made of metal aluminum parts in most cases because of being capable of bearing higher pressure and higher temperature than plastic. At present, most of the vehicular lenses are fixed by locking the upper cover on the lens shaft and then dispensing UV glue, and the combination fixing mode is to use the UV glue for fixing without loosening. The upper and lower lens barrels are required to be processed by screw threads, and the upper cover is slightly inclined instead of being evenly downward after being locked.

Disclosure of Invention

In view of the foregoing, the present utility model provides a lens assembly.

The lens group comprises a first lens, a second lens and a plurality of fusion bonding parts. The second lens is connected with the first lens, wherein an annular gap is formed between the first lens and the second lens. The fusion bonding portion is positioned in the interface annular slit and is adjacent to the peripheral side walls of the first lens and the second lens.

By means of the structure, the lens set disclosed by the scheme utilizes the melt-solidification remolding method of the lens materials rather than the adhesiveness of the external materials such as glue, so that the strength of the whole lens set at the joint can be close to the strength of the lens, the safety and durability of the lens can be effectively improved, and offset misalignment caused by collision or vibration of the lens set in use to the two lenses can be reduced.

The foregoing description of the disclosure and the following description of embodiments are provided to illustrate and explain the spirit and principles of the utility model and to provide a further explanation of the utility model as claimed.

Drawings

FIG. 1 is a schematic cross-sectional view of a lens assembly according to an embodiment of the utility model.

FIG. 2 is a flow chart of a method for joining lenses of a lens group according to an embodiment of the utility model.

FIG. 3 is another flow chart of a portion of a lens laser bonding method of a lens group according to an embodiment of the utility model.

FIG. 4 is a schematic cross-sectional view showing a laser bonding process of a lens assembly according to an embodiment of the utility model.

FIG. 5 is a schematic cross-sectional view illustrating another state of the laser bonding process of the lens assembly according to an embodiment of the present utility model.

Reference numerals illustrate:

1: lens group

10: first lens

101: first periphery

103: circular track

12: second lens

121: a second peripheral edge

123: peripheral side wall

14: interface annular slit

16: fusion bonding portion

18: mirror shaft

3: laser beam

S1-S7: step (a)

Detailed Description

The detailed features and advantages of the present utility model will be readily apparent to those skilled in the art from that description, that is, the objects and advantages of the utility model will be readily apparent to those skilled in the art from the following detailed description, claims, and drawings. The following examples illustrate the aspects of the utility model in further detail, but are not intended to limit the scope of the utility model in any way.

The lens set according to the embodiments of the present utility model may be applied to various lenses, such as cameras, video recorders, drive recorders, mobile phones or computers, and the laser used for the bonding may be a pulse laser or a continuous wave laser (CWlaser), and the wavelength may include infrared light, visible light, ultraviolet light or other electromagnetic waves in other wavelength bands sufficient to melt the lens material under heat. In this context, two lenses are defined as a first lens and a second lens, and the first lens is disposed on the second lens during the bonding process, and there is no limitation in any relation between the two lenses, so long as two lenses that can be combined to produce a lens group by using the present bonding method can be the first lens and the second lens, this part should not be the limitation in the present application. On the other hand, if more than three lens groups are considered as lens groups formed by two lenses, the lens groups can be protected according to the present disclosure.

Referring to fig. 1, fig. 1 is a schematic diagram of a lens assembly according to an embodiment of the utility model. As shown in fig. 1, the lens assembly 1 includes a first lens 10 disposed above, a second lens 12 disposed below, and a plurality of fusion bonds 16 between the two lenses, wherein the two lenses each have a lens and a barrel, particularly a lens made of glass and a barrel made of metal, and the embodiment of the two lenses is not limited to the example shown here, although the first lens 10 has a shorter barrel than the second lens 12. In the present figure, the lens assembly 1 is a combination of a first lens 10 and a second lens 12, and as seen in a sectional view, the first lens 10 is connected to the second lens 12, wherein an annular slit 14 is interposed between the first lens 10 and the second lens 12. The fusion bond 16 is located in the interface annular slit 14 adjacent to the peripheral sidewalls 123 of the first and second lenses. Specifically, the annular slit 14 is formed at the junction of the lens barrels of the first lens 10 and the second lens 12, and the portion of the annular slit 14 near the outer sidewall 123 is covered by an annular sealed fusion bonding portion 16. Unlike the prior art, the material of the joined fusion bond 16 is not a glue-like material such as UV glue, but is formed by solidifying a molten metal such as an aluminum alloy, while the fusion bond 16 is structurally infiltrated into the interface annular slit 14 to some extent. Therefore, the strength of the material of the fusion bonding portion 16 is matched with the contact of a large area, so that the fusion bonding portion 16 has remarkable bonding effect on two lenses, external force vibration can be effectively resisted, and the lens group 1 can maintain imaging quality for a long time, and is a reliable and durable lens group.

Specifically, the first lens 10 and the second lens 12 can be joined by laser joining to form the lens group 1, in particular, by the lens laser joining method of the embodiment described later. Referring to fig. 2, fig. 2 is a flowchart of a lens laser bonding method according to an embodiment of the utility model. As shown in fig. 2, the lens laser bonding method includes the steps of S1: placing the first lens on the second lens such that the first periphery of the first lens and the second periphery of the second lens contact each other and form an interfacing annular slit; step S3: emitting a laser along an annular track on the first lens adjacent to the first periphery such that material located in the annular track melts, wherein a projection of the annular track along a contact direction of the first lens and the second lens is identical to a projection of the first periphery along the contact direction; step S5: stopping the laser while the material flows down and wraps around the interface annular slit; step S7: after stopping the laser, waiting for a predetermined cooling time to form a plurality of fusion bonds in the material.

Although the lens laser bonding method of the lens assembly herein illustrates that the first lens is disposed above the second lens, the above is not limited to being disposed perpendicular to the horizon, for example, in a specific embodiment, the first lens may be disposed on the second lens in an inclined manner, so that the material melted by heat can naturally flow to the lower portion to cover the junction between the two lenses due to the local slope change of the material, and thus, the present disclosure can be claimed.

In step S1, the first lens may be placed on the second lens to allow the two lenses to directly contact each other, or the first lens may be temporarily suspended and fixed by, for example, a fixture, so that a space exists between the first lens and the second lens, which is not a direct contact. Similarly, in step S1, the first lens may be fixed on a reference plane, and then the second lens is slowly moved closer from below the first lens, that is, the second lens may be placed under the first lens, which should not be a limitation in this case.

In addition, step S1 indicates that the first peripheral edge and the second peripheral edge may contact each other to form an interface annular slit, however, other additional steps may be included before the two peripheral edges contact each other, which will be described later. In this example, the first and second peripheral edges are annular planes, and the lens, barrel and lens may be circular, however, the area and shape between the first and second peripheral edges need not be completely equal, i.e. the area of the first peripheral edge may be larger than the area of the second peripheral edge or the area of the second peripheral edge may be larger than the area of the first peripheral edge, so long as the first and second peripheral edges can correspondingly contact and form the interface annular slit.

In step S3, the laser heats the material along a circular track on the first lens adjacent to the first periphery. Specifically, the material in the circular track belongs to an aluminum alloy such as ADC12, and mainly includes substances such as aluminum, silicon, copper, iron, and the like, and the melting point is about 550 degrees celsius (because of the mixture, there is no single exact melting point). The aluminum material is lighter than other metals and has a low melting point, so that the aluminum material is quite suitable for welding by using the laser processing mode, however, the laser processing method of the lens is not limited, is only suitable for the case that the lens material is an aluminum alloy, and can also comprise other metals; in addition, the first lens and the second lens may be made of different materials, for example, aluminum is used for the first lens requiring laser processing, steel is used for the second lens, and even the annular track portion of the first lens may be made of a different material from the other portions of the first lens. The laser may be focused appropriately to increase the light intensity per unit area to melt the material, in particular, the laser intensity for welding may be up to 1MW/cm ² The focusing size can be about 1mm, wherein the intensity of the laser is related to the characteristics of the material to be welded, and suitable materials and laser related parameters can be practically selected according to different requirements, which are not described herein.

When the material of the annular track on the first lens is melted into a liquid state by laser heating, the melted material flows to the second lens by gravity along the contact direction of the first lens and the second lens, and the projection of the contact direction of the first lens and the second lens is the same as the projection of the first periphery along the contact direction, that is, the melted material flows along the contact direction and in step S5, when the material flows downwards to cover the two annular slits formed by the two peripheries, the laser can be stopped.

Specifically, the stopping of the laser does not necessarily mean turning off the laser, but may be, for example, shifting the laser heating point or the laser focusing point, specifically, when the material on the first heating point of the annular track has been melted by heat and is flowing to cover the interface annular slit, the laser and the lens group (the first lens and the second lens) may be relatively rotated, so that the laser heats up for different heating points on the annular track, which is the same as producing the effect of stopping the laser for the first heating point; in addition, the present utility model does not exclude the implementation of multi-task heating, for example, the lens axis of the lens set may be fixed in any direction in space, and the laser is fixed to a point on the annular periphery in space, so that when the method proceeds to S5, the lens set starts to rotate about the lens axis (e.g. Z axis) as the rotation axis, until the laser re-heats the first heating point, which may be referred to as a circle. Considering the difference of materials, laser characteristics and even the residence time of the laser at the heating point, the operator can choose the optimal or required number of turns according to the method, so that each heating point on the circular track is properly melted at each round of laser heating. More specifically, for a multi-turn laser welding scheme, the laser can be trimmed in the Z direction when heating each turn, i.e., the degree of freedom in the axial direction can be increased on the basis of the annular trajectory of each turn, so as to more precisely control the laser welding and improve the quality of the molten bond.

In step S7, the molten material is reshaped into a solid and becomes a molten bond after a period of time without receiving the laser. Specifically, the molten material in the liquid state can be completely coated, filled and slightly infiltrated into the interface annular slit by the plasticity of the liquid, so that a molten joint part with a certain strength is formed at the junction between the two lens barrels after cooling, and the lens laser joining method for joining the two lenses by using laser to form the lens group is completed.

Referring to fig. 3, fig. 3 is another flow chart of a portion of a lens laser bonding method according to an embodiment of the utility model. In this embodiment, in addition to steps S1, S3, S5 and S7 shown in fig. 2, step S2 of adjusting the relative positions of the first lens and the second lens is further included. As shown in fig. 3, before step S3, that is, before the laser is emitted along the annular track, the optical properties of the lens group can be adjusted for the relative positions of the two lenses, that is, step S2: a modulation transfer function (ModulationTransferFunction, MTF) of a combination of the first lens and the second lens is tested and optimized. In other embodiments, the optical transfer function (OpticalTransferFunction, OTF) may be additionally tested and optimized, and related parameters and techniques are not described herein as will be understood by those of ordinary skill in the art.

In step S2, the adjustment of the modulation transfer function ensures the imaging quality of the lens assembly formed by the two lenses, meaning that the two lenses still have a small degree of freedom for fine adjustment in operation before the welding is completed. Specifically, whether the central axes (optical axes or mirror axes) of the two lenses are parallel and coincident and whether the distance between the two lenses is proper affects the imaging quality of the final lens group. Ideally, step S3 of welding using a laser will not change the modulation transfer function after step S2 ensures optimization of the modulation transfer function; however, in other embodiments, when the molten material has not formed the molten bond, i.e. before step S7, the modulation transfer function may be finely tuned again by using some allowable plasticity of the molten material, and even in the case of the above-mentioned multi-turn welding, the modulation transfer function may be finely tuned after step S3 performed for each turn, so as to ensure that the optical condition of the lens set reaches the desired standard.

Referring to fig. 4, fig. 4 is a schematic diagram illustrating a state of a laser bonding process of a lens assembly according to an embodiment of the utility model. As shown in fig. 4, before performing laser welding, the first lens 10 may be placed on the second lens 12, and the modulation transfer function may be adjusted according to the step S2 shown in fig. 2, for example, aligning the lens axes 18 of the two lenses, and preparing to make the first periphery 101 and the second periphery 121 correspond to contact to form an interface annular slit. Referring to fig. 5, fig. 5 is a schematic diagram illustrating another state of the laser bonding process of the lens assembly according to an embodiment of the utility model. When the first periphery 101 of the first lens 10 and the second periphery 121 of the second lens 12 are contacted to generate the interface annular slit 14, the laser 3 heats the annular track 103 made of aluminum alloy of the first lens 10, and after the laser 3 heats and cools, the molten material forms a fusion joint 16 on the outer peripheral side walls 123 of the two lenses to cover and fix the two lenses to form the lens set 1 as shown in fig. 1.

Although the lens group is a combination of the first lens and the second lens, as will be understood by those skilled in the art, the lens group is generally composed of a barrel and a lens, and thus the individual barrel or lens may be regarded as part of the lens or as a lens to be completed later. In another embodiment, the first lens is a lens barrel partially without a lens, and after the two lenses are contacted, an interface annular slit is formed at the junction of the two lens barrels and is attached to the peripheral side wall, that is, the interface annular slit is not necessarily horizontal or vertical relative to the lens axis, so long as the molten material can cover the interface annular slit to form a molten junction after the lens laser joining method is performed.

Although the present utility model has been described in terms of the foregoing embodiments, it is not intended to be limited thereto. Changes and modifications can be made without departing from the spirit and scope of the utility model, and the utility model is not limited to the above-described embodiments. Reference is made to the appended claims for a review of the scope of the utility model.

Claims

1. A lens assembly comprising:

a first lens;

the second lens is connected with the first lens, and an interface annular slit is arranged between the first lens and the second lens; and

and a plurality of fusion bonding parts positioned in the annular slit and adjacent to the peripheral side walls of the first lens and the second lens.

2. The lens assembly of claim 1, wherein the fusion bonds are formed by a lens laser bonding method.

3. The lens assembly of claim 1, wherein the first lens and the second lens each comprise a lens, and a material of the lens is glass.

4. The lens assembly of claim 1, wherein the first lens and the second lens each comprise a barrel, wherein a material of the barrel is metal, and the interface annular slit is located between the barrel of the first lens and the barrel of the second lens.