CN112596231A

CN112596231A - Liquid lens, preparation method thereof and optical system

Info

Publication number: CN112596231A
Application number: CN202011500386.4A
Authority: CN
Inventors: 方勇勇; 邱承彬
Original assignee: Shanghai Kuju Technology Co ltd
Current assignee: Shanghai Kuju Technology Co ltd
Priority date: 2020-12-17
Filing date: 2020-12-17
Publication date: 2021-04-02
Anticipated expiration: 2040-12-17
Also published as: CN112596231B

Abstract

The invention relates to the field of liquid lenses, in particular to a liquid lens, a preparation method thereof and an optical system. The liquid lens includes at least: the light guide plate comprises a shell, a first light-transmitting plate and a second light-transmitting plate, wherein the shell is provided with an assembling hole; a mounting ring mounted in a mounting hole of the housing; an electrode mounted in the annular hole of the mounting ring for applying a voltage; a through hole is formed in the electrode, and a second light-transmitting plate is arranged in the through hole; part of the surface of the housing, part of the surface of the mounting ring, part of the surface of the electrode, the first light-transmitting plate and the second light-transmitting plate constitute the cavity walls of a closed cavity for storing optical liquid in the liquid lens. The liquid lens provided by the invention can seal the gap between the electrode and the shell by using the mounting ring, thereby achieving the purpose of preventing the liquid in the liquid lens from leaking in a severe environment.

Description

Liquid lens, preparation method thereof and optical system

Technical Field

The invention relates to the field of liquid lenses, in particular to a liquid lens, a preparation method thereof and an optical system.

Background

The liquid lens based on the electrowetting principle takes one or two liquids as a base material, and achieves the purpose of zooming by changing the curvature of the liquid surface. The traditional solid lens zooming system needs to drive one or more groups of lenses to move by a stepping/voice coil motor and the like, and has large volume, high cost and slow response. The liquid lens based on the electrowetting principle can perfectly solve the problems, and has the special advantages of high response speed, small occupied space of the structure and good imaging quality. The performance and reliability of a liquid lens is directly dependent on the sealing design of the lens.

However, in the liquid lens, the sealing of the lens may fail due to the harsh environment such as temperature variation and mechanical vibration during the use process, and the risk of liquid leakage may be generated. Therefore, it is an urgent problem to be solved by those skilled in the art to improve the sealing property of the liquid lens.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present invention is directed to a liquid lens with good sealing performance, a method for manufacturing the same, and an optical system, so as to improve the reliability and prolong the lifetime of the liquid lens under severe environments such as temperature variation and mechanical vibration.

To achieve the above and other related objects, the present invention provides a liquid lens including at least:

the light guide plate comprises a shell, a first light-transmitting plate and a second light-transmitting plate, wherein the shell is provided with an assembling hole;

a mounting ring mounted in a mounting hole of the housing;

an electrode mounted in the annular hole of the mounting ring for applying a voltage;

a through hole is formed in the electrode, and a second light-transmitting plate is arranged in the through hole;

part of the surface of the housing, part of the surface of the mounting ring, part of the surface of the electrode, the first light-transmitting plate and the second light-transmitting plate constitute cavity walls of an enclosed cavity in the liquid lens for storing an optical liquid;

and the light beams incident into the closed cavity respectively penetrate through the first light-transmitting plate and the second light-transmitting plate.

In one embodiment, the inner wall of the assembly hole of the shell is provided with an internal thread, the outer wall of the mounting ring is provided with an external thread, and the shell is in threaded connection with the mounting ring.

In one embodiment, a first sealant layer is disposed between the housing and the first transparent plate, and a second sealant layer is disposed between the electrode and the second transparent plate.

In one embodiment, the mounting ring includes a mounting ring body and a first projection provided on an end of the mounting ring body, the first projection extending from the end of the mounting ring body toward the electrode.

In one embodiment, a third sealant layer is disposed between the mounting ring and the electrode, the third sealant layer is respectively disposed between the mounting ring body and the electrode and between the first protrusion and the electrode, and an end of the first protrusion forms a cavity wall of the closed cavity.

In one embodiment, the surface of the electrode in contact with the optical liquid is sequentially plated with a dielectric film and a hydrophobic film, the hydrophobic film covering the dielectric film.

In one embodiment, the optical liquid comprises a conducting liquid and a non-conducting liquid, a liquid interface is formed between the conducting liquid and the non-conducting liquid, the conducting liquid is in contact with the second light-transmitting plate, and the non-conducting liquid is in contact with the first light-transmitting plate.

In one embodiment, the surface of the electrode contacting the conductive liquid is an inclined surface, an included angle between the inclined surface and the second light-transmitting plate is a, and a is greater than 0 ° and smaller than 90 °.

In one embodiment, the first light-transmitting plate has a thickness of less than 0.2mm, and/or the second light-transmitting plate has a thickness of less than 0.2 mm.

In one embodiment, the housing includes a first external force absorbing layer, and the first external force absorbing layer corresponds to the first transparent plate.

In one embodiment, the electrode comprises a second external force absorbing layer, which corresponds to the second light-transmitting plate.

To achieve the above and other related objects, the present invention provides a method for manufacturing a liquid lens,

the preparation method at least comprises the following steps:

installing the first light-transmitting plate in the assembly hole of the shell;

mounting the second light-transmitting plate in the through-hole of the electrode;

mounting the electrode in an annular ring of a mounting ring;

mounting the mounting ring in the mounting hole to form the liquid lens, wherein a part of the surface of the housing, a part of the surface of the mounting ring, a part of the surface of the electrode, the first light-transmitting plate and the second light-transmitting plate form a cavity wall of a closed cavity for storing optical liquid in the liquid lens; and the light beams incident into the closed cavity respectively penetrate through the first light-transmitting plate and the second light-transmitting plate.

To achieve the above and other related objects, the present invention provides an optical system including the liquid lens described in the above embodiments.

In conclusion, the beneficial effects of the invention are as follows:

according to the liquid lens, the preparation method thereof and the optical system provided by the invention, the mounting rings respectively connecting the electrode and the shell are arranged between the shell and the motor, so that the gap between the electrode and the shell can be sealed by the mounting rings, the sealing property of the liquid lens is improved, and the liquid in the liquid lens is prevented from leaking in a severe environment.

Drawings

FIG. 1 is a schematic view of a liquid lens according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a housing of a liquid lens according to an embodiment of the invention;

FIG. 3 is a schematic diagram of a mounting ring in a liquid lens according to an embodiment of the invention;

FIG. 4 is a schematic diagram of an electrode structure in a liquid lens according to an embodiment of the invention;

FIG. 5 is an enlarged view of FIG. 4 at A;

FIG. 6 is a schematic view of a liquid lens with a first external force absorbing layer and a second external force absorbing layer according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a first external force absorbing layer according to an embodiment of the invention;

FIG. 8 is a schematic view showing the structure of a second external force absorbing layer provided for one embodiment of the present invention;

fig. 9 is a schematic flow chart illustrating a method for manufacturing a liquid lens according to an embodiment of the invention.

Description of the element reference numerals

101 outer casing

1011 outer shell body

1012 first projection

1013 assembling hole

1014 installation groove

1015 tool withdrawal groove

102 first light-transmitting plate

103 first sealant layer

104 mounting ring

1041 mounting ring body

1042 second projection

105 third sealant layer

106 electrodes

1061 through hole

1062 inclined plane

1063 dielectric film

1064 hydrophobic Membrane

107 second light-transmitting plate

108 second sealant layer

109 optical liquid

1091 non-conductive liquid

1092 conducting liquid

110 liquid interface

111 first external force absorbing layer

1111 packaging tube

1112 first connecting pipe

1113 first end face

1114 a first through hole

112 second external force absorbing layer

1121 circular plate

1122 second connecting pipe

1123 second through hole

1124 circular hole

1125 second end face

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.

Please refer to fig. 1 to 9. It should be noted that the drawings provided in the present embodiment are only schematic and illustrate the basic idea of the present invention, and although the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation, the form, quantity and proportion of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.

An embodiment of the invention provides a liquid lens, as shown in fig. 1, the liquid lens includes a housing 101, a first transparent plate 102, a mounting ring 104, an electrode 106, and a second transparent plate 107.

As shown in fig. 2, the housing 101 includes a housing body 1011 and a second projection 1012. The housing body 1011 has a fitting hole 1013 formed therein. The second protrusions 1012 are provided on the wall of the fitting hole 1013. The second projection 1012 is disposed around the wall of the fitting hole 1013.

In one embodiment, the second protrusion 1012 is separate from the housing body 1011, and the second protrusion 1012 is mounted in the fitting hole 1013 of the housing body 1011. In another embodiment, the second protrusion 1012 and the housing body 1011 are an integral structure, when the housing body 1011 is processed, a tubular housing blank is processed, then pipe holes of the housing blank are processed from two ends of the housing blank, and the diameter of the pipe holes at the two ends of the housing blank is enlarged, so that the housing body 1011 with the second protrusion 1012 in the middle is formed.

The inner wall of the fitting hole 1013 is provided with an internal thread. The length of the internal thread is more than 0.5mm, preferably 1mm-2 mm. The pitch may be set to 0.5mm, 0.75mm, 1mm, 1.25mm, 1.5mm, 1.75mm, 2mm or any value within the interval.

In one example, the wall of the fitting hole 1013 is further provided with a relief 1015. The relief 1015 is disposed around the wall of the fitting bore 1013 and is formed by the tool that machines the internal threads formed in the fitting bore 1013 after the machining is completed. The relief 1015 is disposed between the second projection 1012 and the internal threads disposed on the interior wall of the assembly bore 1013 and is further configured to receive debris generated during assembly on the interior wall of the assembly bore 1013.

In one example, a mounting slot 1014 is provided on an end surface of the mounting bore 1013. The mounting groove 1014 is circular. The mounting slot 1014 is concentrically disposed with the mounting bore 1013. The mounting slot 1014 has a diameter greater than the diameter of the fitting bore 1013.

As an example, the material of the housing body 1011 includes any one of metallic iron, an iron alloy, metallic copper, a copper alloy, metallic aluminum, and an aluminum alloy.

The first light-transmitting plate 102 is mounted on the second protrusion 1012. The first light-transmitting plate 102 has the same shape as the cross-sectional shape of the fitting hole 1013. The first light-transmitting plate 102 is smaller than the cross-section of the assembly bore 1013. The first light-transmitting plate 102 is mounted on the surface of the second protrusion 1012 perpendicular to the wall of the fitting hole 1013. In one example, the first transparent plate 102 extends to the surfaces of the first protrusions on both sides, and in an alternative example, the first transparent plate covers the surfaces of the first protrusions on both sides, and the end of the first transparent plate is in contact with the wall of the assembly hole.

The first light-transmitting panel 102 is capable of transmitting visible light. The material of the first transparent plate 102 may be an organic material or an inorganic material. In one embodiment, the first light-transmitting plate 102 comprises a glass plate or a PMMA (polymethylmethacrylate) plate.

In one example, the first sealant layer 103 is disposed between the first transparent substrate 102 and the second protrusion 1012. In a further alternative example, the first sealant layer 103 contains glass beads therein for defining the thickness of the sealant layer. Glass beads are attached to the surfaces of the second protrusions 1012 and the first light-transmitting plate 102, respectively. By disposing the glass beads between the first transparent plate 102 and the second protrusions 1012, the thickness of the adhesive layer between the first transparent plate 102 and the second protrusions 1012 can be increased, and the adhesive strength between the first transparent plate 102 and the second protrusions 1012 can be improved.

A mounting ring 104 is also disposed in the mounting bore 1013. The mounting ring 104 includes a mounting ring body 1041 and a first protrusion 1042. The first protrusion 1042 extends from the end of the mounting ring body 1041 toward the electrode 106. An external thread is arranged on the outer wall of the mounting ring body 1041. The mounting ring 104 is threaded by external threads provided on the outer wall of the mounting ring body 1041 and internal threads provided in the fitting bore 1013. After the mounting ring 104 is installed in the mounting bore 1013, the outer sides of the first protrusions 1042 are connected with the second protrusions 1012. The first protrusions 1042 and the first transparent plate 102 are respectively mounted on two opposite sides of the second protrusions 1012.

In one example, relief grooves 1015 can receive debris generated during installation of mounting ring 104 into mounting bore 1013.

In one example, after the collar 104 is installed in the assembly bore 1013, the collar 104 can be removed from the assembly bore 1013 via the mounting slot 1014 because the diameter of the collar 104 is smaller than the diameter of the mounting slot 1014.

In one embodiment, the material of the mounting ring 104 is selected from brass, aluminum alloy, stainless steel, etc. The length of the external thread structure arranged on the outer wall of the mounting ring body 1041 is greater than 0.5mm, preferably 1mm-2 mm. The pitch may be set to 0.5mm, 0.75mm, 1mm, 1.25mm, 1.5mm, 1.75mm, 2mm or any value within the interval.

An electrode 106 is mounted in the annular bore of the mounting ring 104. A third layer of sealant 105 is disposed between the electrode 106 and the mounting ring 104. The third sealant layer 105 is used to fill the gap between the electrode 106 and the mounting ring 104. The surface of the electrode 106 corresponds to the surface of the first protrusion 1042. The surface of the first protrusion 1042 is connected to the surface of the electrode 106. The third sealant layer 105 filled between the electrode 106 and the mounting ring 104 has a "U" shape in cross section.

In one embodiment, the cross-sectional shape of the annular ring of the mounting ring 104 is the same as the cross-sectional profile of the electrode 106. The electrode 106 is bonded in the annular hole of the mounting ring 104 by a glue layer. The electrode 106 is made of brass, aluminum alloy, or the like. The electrode 106 has a through hole 1061 formed therein. The through hole 1061 penetrates the electrode 106. A second transparent plate 107 is installed in the through hole 1061. The cross section of the through hole 1061 is stepped, and the second transparent plate 107 is mounted on the stepped surface of the wall of the through hole 1061. The second transparent plate 107 covers the through hole 1061. The second transparent plate 107 is arranged in parallel to the first transparent plate 102. A second sealant layer 108 is disposed between the second transparent substrate 107 and the wall of the through hole 1061. Glass beads for limiting the thickness of the sealant layer are arranged in the second sealant layer 108. The glass beads are attached to the wall of the through hole 1061 and the surface of the second transparent plate 107, respectively. By arranging the glass beads between the second transparent plate 107 and the wall of the through hole 1061, the thickness of the adhesive layer between the second transparent plate 107 and the wall of the through hole 1061 can be increased, and the bonding strength between the second transparent plate 107 and the wall of the through hole 1061 can be improved.

The first sealant layer 103, the third sealant layer 105, and the second sealant layer 108 are all organic sealant layers. In one embodiment, the sealant used for the first sealant layer 103, the third sealant layer 105 and the second sealant layer 108 is epoxy glue.

The second transparent plate 107 is arranged parallel to the first transparent plate 102. The end surfaces of the second protrusions 1012, the end surfaces of the first protrusions 1042, the walls of the through holes 1061, the surface of the first plate 102 and the surface of the second plate 102 form a closed cavity. Light beams incident into the enclosed cavity can pass through the first and second

transparent plates

102 and 107, respectively. In one embodiment, the axis of the through hole 1061 coincides with the axis of the fitting bore 1013. The first transparent plate 102 is coaxially arranged with the second transparent plate 107.

The sealed cavity is filled with optical liquid. The optical liquid includes a conductive liquid 1091 and a non-conductive liquid 1092. A liquid interface 110 is formed between the conducting liquid 1091 and the non-conducting liquid 1092 inside the closed cavity. The conductive liquid 1091 comprises water, alcohol, a salt solution, or a mixture thereof. The non-conductive liquid 1092 may comprise organic solvents such as silicone oil, chlorobenzene, etc., or mixtures thereof. The density of the conductive liquid 1091 is the same as the density of the non-conductive liquid 1092. The conductive liquid 1091 is in contact with the surface of the electrode 106.

In one embodiment, the surface of the electrode 106 in contact with the conductive liquid 1091 is a bevel 1062. The included angle between the inclined surface 1062 and the second transparent plate 107 is a, and a is greater than 0 ° and smaller than 90 °. Preferably, a is 30 ° to 40 °. By setting the surface of the electrode 106 in contact with the conductive liquid 1091 to be an inclined surface, the contact area between the electrode 106 and the conductive liquid 1091 can be increased, and the electrical triggering efficiency of the electrode 106 on the conductive liquid 1091 can be improved.

The surface of the electrode 106 in contact with the conductive liquid 1091 is sequentially plated with a dielectric film 1063 and a hydrophobic film 1064. The hydrophobic film 1064 covers the dielectric film 1063. The dielectric film 1063 can prevent the electrode 106 from being electrically broken, and the hydrophobic film 1064 is to obtain a larger initial contact angle to make the retardation of the lens smaller. Dielectric film 1063 may be selected from one or more of parylene, tantalum pentoxide, aluminum oxide, and silicon nitride. Hydrophobic membrane 1064 may be a Cytop, AF1600, or other fluoride. Hydrophobic film 1064 has a contact angle with water greater than 100 °.

In one embodiment, the thickness of the first transparent plate 102 and the thickness of the second transparent plate 107 are both less than 0.2 mm. In one embodiment, the thickness of the first transparent plate 102 and the thickness of the second transparent plate 107 are both less than 0.15 mm. Through making the thickness of first light-transmitting board 102 and the thickness of second light-transmitting board 107 all be less than 0.15mm, can take place slight deformation for first light-transmitting board 102 and second light-transmitting board 107 when the deformation takes place under the effect of electrode 106 at the inside optical liquid of seal chamber, for optical liquid provides the deformation space.

In one embodiment, a first external force absorbing layer 111 is provided in the housing 101 and a second external force absorbing layer 112 is provided in the electrode 106 in order to protect the liquid lens. The first external force absorption layer 111 and the second external force absorption layer 112 can absorb external impact force, and prevent the liquid lens from generating bubbles under the impact of external force.

In one embodiment, a first external force absorbing layer 111 is provided in the housing 101 for protecting the liquid lens. As shown in fig. 7, the first external force absorption layer 111 includes a package tube 1111 and a first connection tube 1112 provided on an end surface of the package tube 1111. The wall thickness of first connecting tube 1112 is smaller than the wall thickness of packaging tube 1111. The first connection tube 1112 is concentrically disposed with the package tube 1111. The first connecting pipe 1112 is provided with a plurality of first through holes 1114 distributed in a circular array on the circumferential surface. In one embodiment, the first through hole 1114 extends through an annular wall of the first connection tube 1112. The first through hole 1114 is a square hole. The first connecting pipe 1112 is provided with a first end surface 1113. The first external force absorbing layer 111 is mounted in the fitting hole 1013, the circumferential surface of the packing tube 1111 is connected to the wall of the fitting hole 1013, and the first end 1113 of the first connecting tube 1112 is adhered to the first transparent plate 102. The first external force absorbing layer 111 is disposed concentrically with the fitting hole 1013. The light beam is incident into the sealed cavity through the annular hole of the first connection pipe 1112 and the pipe hole of the packaging pipe 1111.

In one embodiment, the material of the first external force absorbing layer 111 is a metal material. The material of the first external force absorbing layer 111 includes iron, stainless steel, aluminum alloy, titanium alloy TC4, and the like. In one embodiment, the yield strength of the first external force absorbing layer 111 is between 400MPa and 1000MPa, for example the yield strength of the first external force absorbing layer 111 is 500MPa, 700MPa or 800MPa, 950 MPa. The thickness of the first external force absorbing layer 111 is in the range of 8mm to 20mm, for example the thickness of the first external force absorbing layer 111 is 10mm, 12mm or 15 mm. The first connection tube 1112 is arranged coaxially with the package tube 1111. The first connection tube 1112 has a wall thickness of between 0.5mm and 2mm, for example the wall thickness of the first connection tube 1112 is 0.8mm, 1mm, 1.2mm, 1.5mm or 1.8 mm. The first connection pipe 1112 is provided with a plurality of first through holes 1114 distributed in a circular array along the circumference of the first connection pipe 1112. The first through hole 1114 has a length in the axial direction of the first connection pipe 1112 of between 0.2mm and 1mm, for example a length of 0.4mm, 0.6mm, 0.7mm or 0.9 mm. The first through-going hole 1114 has a length along the circumferential surface of the first connection pipe 1112 of between 2mm and 5mm, for example a length of 3mm, 4mm or 4.5 mm.

When the liquid lens falls from a high place, the first through hole 1114 arranged in the first external force absorption layer 111 can absorb external impact force, prevent the liquid in the liquid lens from generating bubbles when the liquid lens is impacted or falls, and prolong the service life of the liquid lens.

In one embodiment, a second external force absorbing layer 112 is provided in the electrode 106 for protecting the liquid lens. As shown in fig. 8, the second external force absorption layer 112 includes a circular plate 1121. The circular plate 1121 is provided with a circular hole 1124. The circular plate 1121 is further provided with a second connection pipe 1122. The annular hole of the second connection pipe 1122 is concentrically disposed with the circular hole 1124. A plurality of second through holes 1123 are formed in the circumferential surface of the second connecting pipe 1122 in a circular array. The height of the second penetration hole 1123 in the axial direction of the second external force absorption layer 112 is between 0.05mm and 0.2 mm. In one embodiment, second through hole 1123 penetrates through the annular wall of second connecting pipe 1122. The second through hole 1123 is a square hole. The second connecting pipe 1122 is provided with a second end face 1125. The second external force absorbing layer 112 is installed in the through hole 1061, the circumferential surface of the circular plate 1121 is connected to the hole wall of the through hole 1061, and the second end face 1125 of the second connecting pipe 1122 is adhered to the second transparent plate 107. The second external force absorbing layer 112 is disposed concentrically with the through hole 1061. The light beam is incident into the sealed chamber through the annular hole of the second connection pipe 1122 and the circular hole 1124.

In one embodiment, the parameters of the second external force absorbing layer 112 are the same as the parameters of the first external force absorbing layer 111.

The second external force absorbing layer 112 can also absorb external force that strikes the liquid lens, and plays a role in preventing liquid in the liquid lens from generating bubbles when the liquid lens is struck or falls, and improving the service life of the liquid lens.

In another embodiment, the first external force absorbing layer 111 and the second external force absorbing layer 113 may also be made of a flexible material having elasticity. The flexible materials such as rubber and foam can also absorb the impact force of the outside on the liquid lens, and play a role in preventing the liquid lens from generating bubbles when being impacted or falling.

In one embodiment, the material layer for absorbing external force is also disposed on the outer sidewall of the housing 101, and the material is selected to be compatible with the first external force absorbing layer 111 and the second external force absorbing layer 112, so that when the liquid lens is impacted by external force, the material layer for absorbing external force disposed on the outer sidewall of the housing 101 can also absorb the impact force of external force, thereby preventing the liquid in the liquid lens from generating bubbles.

By applying a voltage to the electrode 106, the shape of the liquid interface 110 can be changed.

In the liquid lens, the outer surface of the mounting ring 104 is provided with the external thread, the hole wall of the assembly hole 1013 is provided with the internal thread, and the mounting ring 104 can be connected with the shell 101 in a threaded manner, so that the mounting ring 104 and the shell 101 can be quickly detached and maintained, and the service life of each component in the liquid lens is prolonged. By providing the mounting ring 104 between the electrode 106 and the casing 101, the sealing performance of the liquid lens can be improved by the mounting ring 104, and the liquid lens is prevented from leaking under severe environments such as high temperature and severe vibration, thereby improving the service life of the liquid lens.

An embodiment of the present invention provides an optical system including the liquid lens described in the above embodiment.

An embodiment of the present invention provides a method for manufacturing a liquid lens described in the above embodiments, and as shown in the figure, the method includes the following steps S1 to S4.

Step S1: the first light-transmitting plate is mounted in the fitting hole of the housing.

The first transparent plate is a flat plate capable of transmitting visible light. The first light-transmitting plate comprises a glass plate or a PMMA plate. After the first light-transmitting plate is installed in the assembling hole of the shell, the first light-transmitting plate covers the assembling hole.

The shell is a cylindrical pipe, and an assembly hole is formed in the shell. The hole wall of the assembling hole is provided with a first bulge. The first bulge is annular. The surface of the first protrusion is a plane. The shape of the first light-transmitting plate is the same as the shape of the cross section of the assembly hole. The first light-transmitting plate is smaller than the cross section of the assembling hole. The first transparent plate is larger than an annular hole formed by the first protrusion in a surrounding mode.

In one embodiment, at step S1, mounting the first light-transmitting plate in the mounting hole of the housing includes: coating colloid on the surfaces of the second bulges; placing the first light-transmitting plate on the second convex surface coated with the colloid; the glue between the first light-transmitting plate and the second protrusion is cured, and a first sealing glue layer is formed between the first light-transmitting plate and the second protrusion, so that the mounting piece comprising the first light-transmitting plate, the shell and the first sealing glue layer is formed.

Since the first light-transmitting plate is smaller than the cross section of the assembling hole and larger than the annular hole formed by the second protrusion in a surrounding manner, after the first light-transmitting plate is placed on the surface of the second protrusion, the annular hole formed by the second protrusion in a surrounding manner is completely covered by the first light-transmitting plate.

In step S2, a second light-transmitting plate is mounted in the through-hole of the electrode.

The second transparent plate is a flat plate capable of transmitting visible light. The second light-transmitting plate comprises a glass plate or a PMMA plate. After the second light-transmitting plate is installed in the through-hole of the electrode, the second light-transmitting plate covers the through-hole.

The electrodes are cylindrical. The electrodes are provided with through holes. The axis of the through hole coincides with the axis of the electrode. The wall of the through hole is in a step shape. The second light-transmitting plate is larger than the hole on the step surface.

At step S2, mounting a second light-transmitting plate at a through hole provided in an electrode, including: coating colloid on the step surface in the wall of the through hole; placing a second light-transmitting plate on the step surface; and the colloid between the second light-transmitting plate and the stepped surface is cured, and a second sealing adhesive layer is formed between the second light-transmitting plate and the stepped surface, so that the mounting part comprising the second light-transmitting plate, the electrode and the second sealing adhesive layer is formed.

Because the second light-transmitting plate is larger than the holes on the step surface, the second light-transmitting plate covers the holes on the step surface after the second light-transmitting plate is placed on the step surface.

Step S3: the electrode is mounted in the annular ring of the mounting ring.

At step S3, mounting the electrode in the annular ring of the mounting ring, including: coating colloid on the annular hole wall; placing an electrode in the annular ring; and curing the colloid between the electrode and the mounting ring, and forming a third sealing adhesive layer between the electrode and the mounting ring, thereby forming the mounting piece comprising the second light-transmitting plate, the electrode and the second sealing adhesive layer.

In one embodiment, at step S3, mounting the electrode in the annular ring of the mounting ring includes: and installing the electrode in the installation piece comprising the electrode, the second light-transmitting plate and the second sealant layer in the annular hole of the installation ring to form the installation piece comprising the electrode, the second light-transmitting plate, the second sealant layer and the installation ring.

In one embodiment, the mounting ring includes a mounting ring body and a first protrusion disposed on an end of the mounting ring body. The first protrusion extends from the end surface of the mounting ring body toward the inside of the mounting ring. In step S3, the electrode in the mounting member including the electrode, the second light-transmitting plate and the second sealant layer is mounted in the ring hole of the mounting ring, and the mounting member including the electrode, the second light-transmitting plate, the second sealant layer and the mounting ring is formed, including: coating colloid on the outer surface of the electrode; placing the electrode into the annular hole of the mounting ring body, so that the side face of the electrode is connected with the annular wall in the annular hole, and the bottom face of the electrode is connected with the inner surface of the first protrusion; and solidifying the colloid between the mounting ring and the electrode to form a third sealing adhesive layer, thereby forming a mounting piece comprising the electrode, the second light-transmitting plate, the second sealing adhesive layer, the mounting ring and the third sealing adhesive layer.

The cross section of the formed third sealant layer is U-shaped.

Step S4: installing the mounting ring in the assembly hole to form the liquid lens, wherein a cavity wall of an enclosed cavity for storing optical liquid in the liquid lens comprises a part of the surface of the shell, a part of the surface of the mounting ring, a part of the surface of the electrode, the first light-transmitting plate and the second light-transmitting plate; and the light beams incident into the closed cavity respectively penetrate through the first light-transmitting plate and the second light-transmitting plate.

In step S4, mounting the mount ring in the mount hole, forming the liquid lens, including: placing a mounting piece comprising a shell, a first light-transmitting plate and a first sealing adhesive layer in first liquid; injecting a second liquid into the through hole of the electrode in the mounting piece comprising the electrode, the second light-transmitting plate, the second sealant layer, the mounting ring and the third sealant layer; in the first liquid, will the collar is installed in the pilot hole, forms the liquid lens including first liquid, second liquid, shell, first light-passing board, first sealed glue film, electrode, second light-passing board, second sealed glue film, collar, third sealed glue film, and wherein, shell, first light-passing board, first sealed glue film, electrode, second light-passing board, second sealed glue film, collar, third sealed glue film have formed the seal chamber who is used for saving first liquid and second liquid. The housing, the mounting ring, the electrode, the first light-transmitting plate and the second light-transmitting plate are all cavity walls of a closed cavity in the liquid lens for storing the first liquid and the second liquid.

The first liquid is a conductive liquid. In one embodiment, the first liquid comprises an aqueous solution of a salt. The second liquid is a non-conductive liquid. In one embodiment, the second liquid comprises an organic solvent such as silicone oil, chlorobenzene, or the like. The first liquid and the second liquid have the same density and different refractive indexes, are not dissolved, form a liquid interface in the sealed cavity, and can change the shape of the liquid interface by changing the voltage applied to the electrodes, so that the focal length of the liquid lens is changed.

The light beams incident into the sealed cavity respectively pass through the first light-transmitting plate and the second light-transmitting plate.

In one embodiment, the wall of the assembly hole is provided with internal threads and the exterior of the mounting ring is provided with external threads.

In step S4, mounting the mount ring in the mount hole, forming the liquid lens, including: placing a mounting piece comprising a shell, a first light-transmitting plate and a first sealing adhesive layer in first liquid; injecting a second liquid into the through hole of the electrode in the mounting piece comprising the electrode, the second light-transmitting plate, the second sealant layer, the mounting ring and the third sealant layer; in the first liquid, will in the pilot hole is gone into to the collar, make collar and shell threaded connection, form the liquid lens including first liquid, second liquid, shell, first light-passing board, first sealed glue film, electrode, second light-passing board, second sealed glue film, collar, third sealed glue film, wherein, shell, first light-passing board, first sealed glue film, electrode, second light-passing board, second sealed glue film, collar, third sealed glue film have formed the seal chamber body who is used for saving first liquid and second liquid.

After the mounting ring is screwed into the mounting hole, the first protrusion on the mounting ring is connected with the second protrusion in the mounting hole. The end face of the first protrusion, the end face of the second protrusion, the first light-transmitting plate, the second light-transmitting plate and the side wall of the through hole in the electrode form the sealed cavity. The surfaces of the first protrusion and the second protrusion are both flat. The processing precision of the surface of the first protrusion and the surface of the second protrusion are both less than 0.1 mm.

In one embodiment, to improve the sealing property at the joint of the first protrusion and the second protrusion, a flexible material layer is disposed between the first protrusion and the second protrusion. The first protrusion and the second protrusion are respectively connected with two opposite surfaces of the flexible material layer.

In one embodiment, a layer of flexible material is disposed on an outer side of the first protrusion.

In one embodiment, the thickness of the first light-transmitting plate and the thickness of the second light-transmitting plate are both less than 0.2 mm. Through making the thickness of first printing opacity board and second printing opacity board all be less than 0.2mm, can make first printing opacity board and the easy elastic deformation that takes place of second printing opacity board, when the effect of electrode is out of shape to inside first liquid and the second liquid of seal chamber, the elastic deformation of first printing opacity board and second printing opacity board can provide the deformation space for first liquid and second liquid.

The first light-transmitting plate includes a glass plate or a PMMA plate or the like having high light transmittance. The first light-transmitting plate also includes a glass plate or a PMMA plate or the like having high light transmittance. When the thickness of the first light transmission plate and the thickness of the second light transmission plate are smaller, the first light transmission plate and the second light transmission plate are easy to damage. In order to prevent the first and second light-transmitting plates from being damaged, a first external force absorbing layer and a second external force absorbing layer are respectively disposed in the liquid lens.

In step S4, after the mounting ring is mounted in the mounting hole and the liquid lens is formed, the method further includes: and a first external force absorption layer is arranged on the surface of the first light-transmitting plate. The first external force absorption layer is a hollow material layer.

In one embodiment, the first external force absorbing layer comprises an encapsulation tube and a first connection tube arranged on an end face of the encapsulation tube. The wall thickness of the first connecting tube is smaller than the wall thickness of the encapsulation tube. The first connecting pipe and the packaging pipe are arranged concentrically. The circumferential surface of the first connecting pipe is provided with a plurality of first through holes distributed in an annular array. The height of the first through hole along the axial direction of the first external force absorption layer is between 0.05mm and 0.2 mm. In one embodiment, the first through-going hole extends through the circumferential wall of the first connecting tube. The first through hole is a square hole. The first connecting pipe is provided with a first end surface. The first external force absorption layer is installed in the assembly hole, the circumferential surface of the packaging tube is connected with the hole wall of the assembly hole, and the first end face of the first connecting tube is bonded on the first light-transmitting plate. The first external force absorption layer is concentrically arranged with the assembly hole. And light beams are emitted into the sealed cavity through the annular hole of the first connecting pipe and the pipe hole of the packaging pipe.

Installing a first external force absorbing layer on a surface of the first transparent plate, comprising: and adhering the first end face on the first external force absorption layer to the first light-transmitting plate.

In step S4, after the mounting ring is mounted in the mounting hole and the liquid lens is formed, the method further includes: and a second external force absorption layer is arranged on the surface of the second light-transmitting plate. The second external force absorbing layer is a hollow material layer.

The second external force absorbing layer includes a circular plate. The circular plate is provided with a circular hole. The circular plate is also provided with a second connecting pipe. The annular hole of the second connecting pipe is concentrically arranged with the circular hole. The circumferential surface of the second connecting pipe is provided with a plurality of second through holes distributed in an annular array. The height of the second through hole along the axial direction of the second external force absorption layer is between 0.05mm and 0.2 mm. In one embodiment, the second through hole penetrates through the annular wall of the second connecting pipe. The second through hole is a square hole. The second connecting pipe is provided with a second end face. The second external force absorption layer is arranged in the through hole, the circumferential surface of the circular plate is connected with the hole wall of the through hole, and the second end face of the second connecting pipe is bonded on the second light-transmitting plate. The second external force absorbing layer is concentrically disposed with the through-hole. The light beam is incident to the inside of the sealed cavity through the annular hole and the circular hole of the second connecting pipe.

Mounting a second external force absorbing layer on a surface of the second light-transmitting plate, comprising: and adhering the second end face on the second external force absorption layer to the second light-transmitting plate.

According to the method, the outer surface of the mounting ring is provided with the external threads, the hole wall of the assembling hole is provided with the internal threads, and the mounting ring can be in threaded connection with the shell, so that the mounting ring and the shell can be rapidly detached and maintained, and the service life of each part in the liquid lens is prolonged. Through set up the collar between electrode and shell, can utilize the collar to improve liquid lens's leakproofness, prevent that liquid lens from appearing phenomenons such as weeping under adverse circumstances such as high temperature, violent vibrations to improve liquid lens's life.

The explanations of the terms, the steps and the functional parameters in this embodiment can refer to the above embodiments, and are not repeated here.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. A liquid lens, characterized in that the liquid lens comprises at least:

a mounting ring mounted in a mounting hole of the housing;

2. The liquid lens as claimed in claim 1, wherein the fitting hole of the housing has an inner thread on an inner wall thereof, and the mounting ring has an outer thread on an outer wall thereof, and the housing is screwed to the mounting ring.

3. The liquid lens according to claim 1, wherein a first sealant layer is disposed between the housing and the first transparent plate, and a second sealant layer is disposed between the electrode and the second transparent plate.

4. The liquid lens according to claim 1, wherein the mount ring includes a mount ring body and a first projection provided at an end of the mount ring body, the first projection extending from the end of the mount ring body toward the electrode.

5. The liquid lens according to claim 4, wherein a third sealant layer is disposed between the mounting ring and the electrode, the third sealant layer is respectively disposed between the mounting ring body and the electrode, and between the first protrusion and the electrode, and an end of the first protrusion forms a cavity wall of the closed cavity.

6. The liquid lens according to claim 1, wherein a surface of the electrode in contact with the optical liquid is sequentially plated with a dielectric film and a hydrophobic film, the hydrophobic film covering the dielectric film.

7. The liquid lens according to claim 1, wherein the optical liquid comprises a conductive liquid and a non-conductive liquid, the conductive liquid and the non-conductive liquid forming a liquid interface therebetween, the conductive liquid being in contact with the second light-transmissive plate, the non-conductive liquid being in contact with the first light-transmissive plate.

8. The liquid lens according to claim 7, wherein the surface of the electrode in contact with the conductive liquid is a slope, the angle between the slope and the second transparent plate is a, and a is greater than 0 ° and smaller than 90 °.

9. The liquid lens according to claim 1, wherein the first light-transmitting plate has a thickness of less than 0.2mm and/or the second light-transmitting plate has a thickness of less than 0.2 mm.

10. The liquid lens according to any one of claims 1-9, wherein the housing comprises a first external force absorbing layer corresponding to the first light-transmitting plate.

11. A liquid lens according to any one of claims 1-9, wherein said electrode comprises a second external force absorbing layer, said second external force absorbing layer corresponding to said second light-transmitting plate.

12. A method for producing a liquid lens, comprising at least the steps of:

mounting the electrode in an annular ring of a mounting ring;

13. An optical system comprising a liquid lens according to any one of claims 1 to 11.