Alignment method and assembly method of lens group, lens, glued lens group and display device

Abstract

The invention discloses an alignment method and an assembly method of a lens group, a lens, a glued lens group and a display device. The alignment method of the lens group comprises the following steps: arranging a first electrode body on the first lens, and arranging a second electrode body on the second lens; the oppositely spaced electrode bodies are used as capacitors; adjusting the lens, measuring the capacitance of the capacitor, and adjusting the gap to reach the target thickness according to the capacitance change of the capacitor. According to the lens group alignment method, the control precision of the gap thickness of the lenses can be improved, the cost is low, and the measurement and adjustment efficiency is high.

Description

Technical Field

[0001] The invention relates to the field of optical equipment, and comprises an alignment method and an assembly method of a lens group, a lens and a glued lens group, and a display device. Background Art

[0002] Generally, there is a gap between adjacent lenses in a lens set. Usually, the thickness between lenses is controlled by an assembly tool. However, there is a certain error in the assembly of the assembly tool itself, and the control accuracy of the thickness between lenses is limited. Especially when the thickness between lenses needs to be adjusted, if the assembly tool is adjusted first, and then the thickness between lenses is indirectly adjusted by the assembly tool, the thickness between lenses will have a greater error.

[0003] The thickness between lenses in some lens groups is at the micron level. For example, the thickness of the colloid between lenses in a glued lens group is extremely thin, so the gap thickness between adjacent lenses needs to be controlled with extremely high precision. However, due to the error in the injection molding process, the thickness of the general colloid cannot be well controlled, which affects the final display effect.

[0004] Some solutions in the prior art use optical equipment to further measure the thickness between lenses. The equipment has high cost and is complicated to use, which affects the assembly efficiency of the lens group. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an alignment method for a lens assembly, which can be used to align and improve the control accuracy of the gap thickness of the lens, and has low cost and easy operation.

[0006] The present invention also provides an assembling method of a glued lens assembly using the above alignment method.

[0007] The present invention also provides a lens for implementing the above alignment method.

[0008] The present invention also provides a cemented lens set having the above lenses.

[0009] The present invention also provides a display device having the lens.

[0010] According to the alignment method of the lens assembly of the first aspect of the present invention, the lens assembly comprises two lenses, namely a first lens and a second lens, and there is a gap between the two lenses. The alignment method comprises the following steps:

[0011] S1: a first electrode body is arranged on the first lens, and a second electrode body is arranged on the second lens, wherein the first electrode body and the second electrode body are arranged in a direction parallel to the optical axis of the lens group to form a column of electrode groups;

[0012] S2: using the electrode group as a capacitor, and setting the distance between the first electrode body and the second electrode body opposite to each other on both sides of the gap to an adjustable electrode distance;

[0013] S3: According to the change relationship between the capacitance of the capacitor and the plate spacing, the lens is adjusted and the capacitance of the capacitor is measured, and the adjustable plate spacing is adjusted to the target distance according to the change of the measurement result so that the gap reaches the target thickness.

[0014] The alignment method of the lens assembly according to the first aspect of the present invention can not only improve the control accuracy of the gap thickness of the lens, but also, compared with other complex devices, the solution of using capacitance changes to react to distance changes is not costly, and the detection results can be obtained quickly and the adjustment efficiency is high, which can improve the alignment efficiency of the lens assembly.

[0015] In some embodiments, step S3 includes the following steps:

[0016] S31: adjusting the adjustable pole distance to an initial distance to obtain an initial capacitance value of the capacitor;

[0017] S32: acquiring a target capacitance value of the capacitor corresponding to the adjustable plate distance at the target distance according to a change relationship between the capacitance of the capacitor and the plate distance;

[0018] S33: adjusting the lens until the measured capacitance of the capacitor reaches a set range where the target capacitance value is located.

[0019] In some specific embodiments, when the first electrode body is provided in step S1, the first electrode bodies are provided on opposite sides of the first lens respectively;

[0020] When the second electrode bodies are arranged in step S1, the second electrode bodies are arranged on opposite sides of the second lens, respectively, so that two first electrode bodies and two second electrode bodies in the same column of the electrode group are arranged in a direction parallel to the optical axis of the lens group;

[0021] When the electrode group is used as a capacitor in step S2, two first electrode bodies opposite to each other on the first lens are used as a first capacitor, the first electrode body and the second electrode body opposite to each other on both sides of the gap are used as a second capacitor, two second electrode bodies opposite to each other on the second lens are used as a third capacitor, the first capacitor, the second capacitor and the third capacitor are used as a series capacitor group, and the distance between the first electrode body and the second electrode body of the second capacitor is used as the adjustable electrode distance;

[0022] When measuring the capacitance of the capacitor in step S3, the capacitance of the series capacitor group is measured.

[0023] Specifically, in step S1, a plurality of the first electrode bodies are disposed on both sides of the first lens, and a plurality of the second electrode bodies are disposed on both sides of the second lens, and the first electrode bodies and the second electrode bodies form a plurality of columns of the electrode groups;

[0024] In step S2, each column of the electrode groups is used as a series capacitor group;

[0025] In step S3, the capacitance of each of the series capacitor groups is measured when the lens is adjusted.

[0026] Optionally, in step S3, adjusting the lens includes translating along a direction parallel to the optical axis, translating along a direction perpendicular to the optical axis, and tilting the lens.

[0027] Optionally, the plurality of rows of electrode groups are centrally symmetrically distributed relative to the optical axis of the mirror group.

[0028] Optionally, the first electrode body and the second electrode body are electrode sheets with equal areas.

[0029] Furthermore, the first electrode body is buried in the first lens and has a flush surface, and the second electrode body is buried in the second lens and has a flush surface.

[0030] According to the second aspect of the present invention, the method for assembling a glued lens assembly comprises the following steps:

[0031] Overlaying a first lens and a second lens, with a gap between the first lens and the second lens;

[0032] According to the above alignment method, aligning the first lens and the second lens;

[0033] After the alignment is completed, the gap between the first lens and the second lens is filled with colloid to form a glued lens set.

[0034] According to the assembly method of the glued lens assembly of the second aspect of the present invention, the gap thickness of the lenses is strictly controlled by the alignment method before the glue is injected, which can improve the control accuracy of the glue thickness and reduce the impact of poor thickness control caused by injection molding process errors.

[0035] The lens according to the embodiment of the third aspect of the present invention is used to implement the above alignment method, and an electrode body is arranged on the lens.

[0036] According to the lens of the embodiment of the third aspect of the present invention, the electrode body on the lens can be used as a capacitor during the alignment process to accurately adjust the spacing thickness.

[0037] Specifically, electrode bodies are disposed on two opposite sides of the lens, and the electrode bodies on both sides are arranged in a direction parallel to the optical axis of the lens.

[0038] Specifically, the electrode body is buried in the lens, and one side surface of the electrode body is flush with the surface of the lens.

[0039] Optionally, a plurality of the electrode bodies are provided on each side of the lens, and the plurality of the electrode bodies are centrally symmetrically distributed relative to the optical axis of the lens.

[0040] The glued lens set according to the fourth aspect of the present invention comprises at least two lenses as described in the above embodiments, and the gap between two adjacent lenses is filled with colloid.

[0041] According to the glued lens assembly of the fourth aspect of the present invention, the precision control of the colloid thickness can be improved, thereby improving the quality of the displayed image.

[0042] A display device according to an embodiment of a fifth aspect of the present invention comprises: a housing and a lens disposed in the housing, wherein the lens comprises at least two lenses described in the above embodiments or comprises the cemented lens group described in the above embodiments.

[0043] The display device according to the fifth aspect of the present invention can improve the quality of displayed images.

[0044] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0046] Figure 1 is a cross-sectional view of a lens assembly according to an embodiment of the present invention;

[0047] Figure 2 is an alignment flow chart of a mirror assembly according to some embodiments of the present invention;

[0048] Figure 3 is an alignment flow chart of a lens assembly in some other embodiments of the present invention;

[0049] Figure 4 is a flow chart of the adjustment process of the lens assembly during alignment according to an embodiment of the present invention;

[0050] Figure 5 is a graph showing a change in relationship between the capacitance of the second capacitor and the adjustable polar distance in one embodiment;

[0051] Figure 6 is a front view of a lens assembly according to an embodiment of the present invention;

[0052] Figure 7 is an assembly flow chart of a glued lens assembly according to an embodiment of the present invention;

[0053] Figure 8 is an alignment flow chart in the assembly of a cemented lens assembly in some embodiments;

[0054] Fig. 9 is a cross-sectional view of a lens according to an embodiment of the present invention;

[0055] Fig.10 is a cross-sectional view of a cemented lens assembly according to an embodiment of the present invention;

[0056] Fig.11 is a schematic diagram of a display device according to an embodiment of the present invention.

[0057] Reference numerals:

[0058] Display device 1000,

[0059] Lens assembly 100, cemented lens assembly 100A, optical axis L;

[0060] Lens 10, first lens 11, second lens 12, gap 13;

[0061] Electrode group 20, electrode body 2, first electrode body 21, second electrode body 22;

[0062] A series capacitor group 30, a capacitor 3, a first capacitor 31, a second capacitor 32, and a third capacitor 33;

[0063] The capacitance C of the series capacitor group total , capacitance C1 of the first capacitor, capacitance C2 of the second capacitor, capacitance C3 of the third capacitor;

[0064] The first pole distance d1, the third pole distance d2,

[0065] Adjustable pole distance d2, initial distance d2_0, target distance d2_2, distance change Δd;

[0066] The initial capacitance value C of the series capacitor group total _0, target capacitance value C total _2. Capacitance change ΔC;

[0067] Colloid40. DETAILED DESCRIPTION

[0068] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0069] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "thickness", "axial" and the like is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0070] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] The following describes an alignment method of the lens assembly 100 according to an embodiment of the present invention with reference to the accompanying drawings.

[0072] In the alignment method of the lens assembly 100 according to the first aspect of the present invention, Figure 1 As shown, the lens assembly 100 includes two lenses 10, namely a first lens 11 and a second lens 12, with a gap 13 between the two lenses 10. The alignment method of the lens assembly 100 is mainly an adjustment method for the thickness of the gap 13. The thickness of the lens 10 and the gap 13 mentioned herein refers to their dimensions along the direction of the optical axis L of the lens assembly 100.

[0073] It is understandable that the lens assembly 100 may include two or more lenses 10, and there is a gap 13 between every two lenses 10. In this document, for the convenience of simplifying the description, when the thickness of a gap 13 is adjusted, the lenses 10 on both sides of the gap 13 are referred to as the first lens 11 and the second lens 12 respectively.

[0074] The alignment method of the lens assembly 100 is as follows: Figure 1 and Figure 2 , including the following steps:

[0075] S1: a first electrode body 21 is disposed on the first lens 11, and a second electrode body 22 is disposed on the second lens 12, wherein the first electrode body 21 and the second electrode body 22 are arranged in a direction parallel to the optical axis L of the lens assembly 100 to form a row of electrode groups 20;

[0076] Among them Figure 1 As shown, the distance between the center of the first electrode body 21 on the first lens 11 and the optical axis L is x1, and the distance between the center of the second electrode body 22 on the second lens 12 and the optical axis L is x2. In order to reduce waste and simplify subsequent calculations, x1 and x2 can be set equal, the first electrode body 21 and the second electrode body 22 are exactly the same in shape, and the relative area of ​​the two is the projection area of ​​one of the electrode bodies 2 on the plane perpendicular to the optical axis L. Of course, the present application solution may not be limited to this.

[0077] S2: The electrode group 20 is used as a capacitor 3, and the distance between the first electrode body 21 and the second electrode body 22 on both sides of the gap 13 is used as the adjustable electrode distance d2;

[0078] S3: According to the change relationship between the capacitance and the plate spacing of the capacitor, the lens 10 is adjusted and the capacitance of the capacitor 3 is measured. According to the change in the measurement result, the adjustable plate spacing d2 is adjusted to the target distance d2_2 so that the gap 13 reaches the target thickness.

[0079] The alignment method of the lens assembly 100 of the embodiment of the present invention can improve the adjustment accuracy of the thickness of the gap 13 between the two lenses 10. For example, the lens assembly 100 used in many devices has a gap 13 thickness of several microns to tens of microns. It is difficult to adjust the thickness of the gap 13 at the micron level by assembly tooling, but the alignment method of the embodiment of the present invention can control the thickness of the gap 13 to the micron level. Of course, in actual applications, the control accuracy level of the thickness of the gap 13 of the lens 10 is adaptively changed according to the needs of the application scenario, and is not limited here.

[0080] Before performing step S3, the first lens 11 and the second lens 12 are in a superimposed state, a gap 13 is formed between the first lens 11 and the second lens 12, and the optical axes L of the two lenses 10 are substantially overlapped, so the optical axes L of the two lenses 10 can also be collectively referred to as the optical axis L of the lens assembly 100. Usually, according to the alignment method of the embodiment of the present invention, after the lenses 10 are aligned and adjusted, the lenses 10 are fixed and installed.

[0081] The solution of forming a capacitor 3 by two opposing electrode bodies 2 in the embodiment of the present invention is the same as the principle of a common parallel plate capacitor. In a common parallel plate capacitor, the capacitance of the capacitor is inversely proportional to the distance between the plates, and the capacitance of the capacitor can be obtained when the distance between the plates is obtained. On the contrary, in the alignment method of the lens assembly 100 in the embodiment of the present invention, after obtaining the capacitance of the capacitor 3, the adjustable distance d2 can be obtained by calculation.

[0082] Specifically, the capacitance of a common parallel plate capacitor is calculated as shown in the following formula (1).

[0083]

[0084] In the formula, C is the capacitance of the capacitor, ε0 is the absolute dielectric constant in vacuum, εr is the relative dielectric constant, A is the facing area of ​​the two plates, and d is the distance between the plates.

[0085] Therefore, the first lens 11 or the second lens 12 can be adjusted to change the adjustable pole distance d2. When the adjustable pole distance d2 changes, the capacitance detector detects that the capacitance of the capacitor 3 also changes. When the capacitance value is detected to be within the set range of the target capacitance value, it indicates that the adjustable pole distance d2 reaches the target distance d2_2, and the gap 13 between the two lenses 10 reaches the target thickness.

[0086] Here, the capacitance detector can be any capacitance detector known in the prior art. The type, structure and principle of the capacitance detector are well-known technologies and are not described in detail herein. The result directly obtained by the capacitance detector (such as a multimeter) may be a capacitance value or other electrical parameters. When the direct result after the capacitance detector detects is other electrical parameters, the electrical parameters are converted to the capacitance value.

[0087] When it is detected that the electrical parameter reaches the set range of the target value, it can also indicate that the adjustable pole distance d2 reaches the target distance d2_2 and the gap 13 between the two lenses 10 reaches the target thickness.

[0088] This alignment method can not only improve the control accuracy of the thickness of the gap 13 of the lens 10, but also, compared with other complex devices, the solution of using capacitance changes to respond to distance changes is low-cost and easy to operate.

[0089] It should be noted that, in the embodiment of the present invention, the specific position of the electrode body 2 on the lens 10 is not limited. The electrode body 2 can be located on the surface of the lens 10, such as Figure 1The first electrode body 21 and the second electrode body 22 shown as solid blocks in the example are respectively arranged on the surface of the first lens 11 and the second lens 12. This not only makes it easy to arrange the electrode body 2, but also the surface of the electrode body 2 is exposed on the surface of the lens 10, which is convenient for power connection. The electrode body 2 can also be arranged inside the lens 10, and a lead wire can be connected for power connection, and the other end of the lead wire extends from the lens 10. Figure 1 In the example, the first electrode body 21 and the second electrode body 22 shown in the dashed blocks are disposed inside the first lens 11 and the second lens 12 respectively.

[0090] Under the two settings, when the relative position of the electrode body 2 on the lens 10 is determined, and the relevant parameters of the electrode body 2 and the lens 10 (such as the dielectric constant, the shape parameters of the electrode body 2, etc.) are determined, the mathematical model of the lens group 100 is constructed according to the calculation method known in the prior art, and the relationship between the capacitance of the capacitor 3 and the adjustable pole distance d2 is determined, and the target capacitance value corresponding to the capacitor 3 when the adjustable pole distance d2 reaches the target distance d2_2 is obtained.

[0091] It is understandable that, during the alignment stage of the lens assembly 100, the lens assembly 100 is usually in an air environment, and it is not excluded that some solutions are adjusted in a vacuum environment. To simplify the description, it is assumed here that the lens assembly 100 is aligned in an air environment and the lens 10 is a glass sheet. When the electrode group 20 is provided with a capacitor 3, the medium between the two electrode bodies 2 of the capacitor 3 can be a single air medium or a composite medium including an air layer and a glass layer. In the case of a composite medium, the method of constructing a mathematical model of the relationship between the capacitance of the capacitor 3 and the adjustable pole distance d2 is also a prior art, and how to determine the capacitance-pole distance relationship of the capacitor according to the mathematical model is not the protection point of the present invention, so it is not repeated here.

[0092] As described above, when the inter-plate dielectric of the capacitor 3 is set to a single dielectric, the difficulty of setting the capacitance-plate distance relationship of the capacitor can be greatly reduced.

[0093] To further reduce the difficulty, in some embodiments, such as Figure 1 As shown, each lens 10 is provided with electrode bodies 10 on both sides.

[0094] That is, when the first electrode bodies 21 are arranged in step S1, the first electrode bodies 21 are respectively arranged on two opposite sides of the first lens 11. When the second electrode bodies 22 are arranged in step S1, the second electrode bodies 22 are respectively arranged on two opposite sides of the second lens 12. In this way, the two first electrode bodies 21 and the two second electrode bodies 22 in the same column of the electrode group 20 are arranged in a direction parallel to the optical axis L of the lens group 100.

[0095] When the electrode group 20 is used as the capacitor 3 in step S2, the two opposite first electrode bodies 21 on the first lens 11 are used as the first capacitor 31, the first electrode body 21 and the second electrode body 22 opposite to each other on both sides of the gap 13 are used as the second capacitor 32, and the two opposite second electrode bodies 22 on the second lens 12 are used as the third capacitor 33. The first capacitor 31, the second capacitor 32 and the third capacitor 33 are used as a series capacitor group 30, and the distance between the first electrode body 21 and the second electrode body 22 of the second capacitor 32 is used as the adjustable pole distance d2.

[0096] When measuring the capacitance of capacitor 3 in step S3, the capacitance C of the series capacitor group 30 is measured. total .

[0097] therefore, Figure 2 The alignment flow chart of the mirror assembly 100 shown in FIG. 1 can be further developed into Figure 3 The alignment flow chart shown in FIG. 1 is a method for aligning the lens assembly 100. Figure 3 , including the following steps:

[0098] S1′: first electrode bodies 21 are respectively disposed on two opposite sides of the first lens 11, and second electrode bodies 22 are respectively disposed on two opposite sides of the second lens 12. The two first electrode bodies 21 and the two second electrode bodies 22 are arranged in a direction parallel to the optical axis L of the lens assembly 100 to form a row of electrode groups 20;

[0099] S2': the two first electrode bodies 21 opposite to each other on the first lens 11 are used as the first capacitor 31, the first electrode bodies 21 and the second electrode bodies 22 opposite to each other on both sides of the gap 13 are used as the second capacitor 32, the two second electrode bodies 22 opposite to each other on the second lens 12 are used as the third capacitor 33, and the first capacitor 31, the second capacitor 32 and the third capacitor 33 are connected in series as a series capacitor group 30, wherein the distance between the first electrode body 21 and the second electrode body 22 of the second capacitor 32 is the adjustable pole distance d2;

[0100] S3': According to the change relationship between the capacitance and the plate spacing of the capacitor, the lens 10 is adjusted and the capacitance C of the series capacitor group 30 is measured. total According to the capacitance change of the series capacitor group 30, the adjustable pole distance d2 of the second capacitor 32 is adjusted to the target distance d2_2 so that the gap 13 reaches the target thickness.

[0101] In the alignment method of the lens assembly 100, the electrode group 20 is arranged in a direction parallel to the optical axis L of the lens assembly 100. When the series capacitor group 30 is set, it is not necessary to connect wires between the electrode bodies 2. totalWhen the two connectors of the capacitance detector are connected directly to the outermost first electrode body 21 and the second electrode body 22, there is no need to connect the two electrode bodies 2 of the second capacitor 32, which greatly reduces the difficulty of detection.

[0102] Especially when the gap 13 of the lens 10 is relatively small (even only a few microns), it is difficult for the connector of the capacitance detector to extend into the gap 13 and connect to the electrode body 2, and it is difficult not to knock the aligned lens 10 out of alignment again when the connector of the capacitance detector is removed after the measurement is completed. Therefore, by adopting the alignment method of the embodiment of the present invention, since there is no need for a connector to connect the two electrode bodies 2 of the second capacitor 32, the existence of the connector will not interfere with the adjustment of the lens 10, and the influence of the removal of the connector on the position of the lens 10 is also reduced.

[0103] In the embodiment of the present invention, the series capacitor group 30 is composed of a first capacitor 31, a second capacitor 32, and a third capacitor 33 connected in series. Therefore, the capacitance C of the series capacitor group 30 is total The relationship between the capacitance C1 of the first capacitor 31, the capacitance C2 of the second capacitor 32, and the capacitance C3 of the third capacitor 33 is as shown in the following formula (2).

[0104]

[0105] Therefore, the capacitance C of the series capacitor group 30 can be obtained by substituting the capacitance formula (1) into the above formula (2). total The relationship between the adjustable pole distance d2 of the second capacitor 32 is shown in the following formula (3).

[0106]

[0107] Wherein, ε0 is the absolute dielectric constant in vacuum, and ε0 is a known constant. ε1 and ε3 are the relative dielectric constants when the medium is the lens 10, and both are known constants. ε2 is the relative dielectric constant when the medium is the ambient gas (such as air), and is a known constant.

[0108] Wherein, A1 is the facing area of ​​the two first electrode bodies 21 of the first capacitor 31, A2 is the facing area of ​​the first electrode body 21 and the second electrode body 22 of the second capacitor 31, and A3 is the facing area of ​​the two second electrode bodies 22 of the third capacitor 33. Since each electrode body 2 is arranged on the lens 10 for measurement, its installation position on the lens 10 has been determined, and A1, A2, and A3 are all known quantities. Even if there is a certain error in the relative position of the first lens 11 and the second lens 12, the influence of the error on A2 can be ignored.

[0109] Wherein, d1 is the distance between the two first electrode bodies 21 of the first capacitor 31 (referred to as the first electrode distance d1), d2 is the distance between the first electrode body 21 and the second electrode body 22 of the second capacitor 31 (i.e., the adjustable electrode distance d2 of the second capacitor 32), and d3 is the distance between the two second electrode bodies 22 of the third capacitor 33 (referred to as the third electrode distance d3). The specific positions are as follows: Figure 1 As shown. Since each electrode body 2 is set on the lens 10 for measurement, its installation position on the lens 10 has been determined, and d1 and d3 can be determined as known quantities. And d2 is the target to be adjusted and obtained through measurement and calculation. Therefore, in Figure 1 The second capacitor 32 is shown with a variable capacitance symbol.

[0110] It is understandable that when the gap 13 between the two lenses 10 needs to be adjusted to the target thickness, the adjustable pole distance d2 of the second capacitor 31 needs to be adjusted to the target distance d2_2. According to formula (3), when the adjustable pole distance d2 is at the target distance d2_2, the capacitance C of the corresponding series capacitor group 30 is total To achieve the target capacitance value C total _2.

[0111] Therefore, the first lens 11 or the second lens 12 can be adjusted to change the adjustable polarity d2 of the second capacitor 32. When the adjustable polarity d2 of the second capacitor 32 changes, the capacitance detector detects the capacitance C of the series capacitor group 30. total When the capacitance C is detected total Reach the target capacitance value C total_ 2, it indicates that the adjustable pole distance d2 reaches the target distance d2_2, and the gap 13 between the two lenses 10 reaches the target thickness.

[0112] In some embodiments, Figure 4 As shown, step S3 includes the following steps:

[0113] S31: adjusting the adjustable pole distance d2 to the initial distance d2_0, and obtaining the initial capacitance value of the capacitor 3;

[0114] According to the change relationship between the capacitance and the plate spacing of the capacitor, the target capacitance value of the capacitor 3 corresponding to the adjustable plate spacing d2 at the target distance d2_2 is obtained;

[0115] S32: adjusting the lens 10 until the measured capacitance of the capacitor 3 reaches a set range where the target capacitance value is located.

[0116] That is to say, in the initial stage of the lens assembly 10, the adjustable pole distance d2 is first adjusted to the initial distance d2_0 using the assembly tool, and the initial capacitance value of the capacitor 3 is obtained. Then the adjustable pole distance d2 is adjusted in the direction of the target distance d2_2 until the capacitance of the capacitor 3 reaches the set range where the target capacitance value is located. The size of the set range is determined according to the actual situation, such as the set range is within the range of plus or minus 10% of the target capacitance value.

[0117] In step S31 , the adjustable pole distance d2 is adjusted to the initial distance d2_0 , and the target capacitance value is obtained. The order of these two steps is not limited.

[0118] In this embodiment, the adjustable pole distance d2 is first adjusted to the determined initial distance d2_0 by using an assembly tool. The reason is that the variation relationship curve between the capacitance of the capacitor and the adjustable pole distance d2 has a large slope when the adjustable pole distance d2 is too small, and the difference between the adjustable pole distance d2 and the target distance d2_2 is too large when the adjustable pole distance d2 is too large, and the adjustment is slow. Figure 4 The change relationship curve of the capacitance C2 of the second capacitor 32 relative to the adjustable pole distance d2 is shown. Near the initial distance d2_0, the curvature of the change relationship curve is moderate, and the change amplitude of the adjustable pole distance d2 and the capacitance is generally close. When the adjustable pole distance d2 is adjusted, it is easy to observe whether the capacitance reaches the target capacitance value. If the adjustable pole distance d2 is adjusted from zero to the direction of the target distance d2_2, the measured capacitance change amplitude is too large, making it difficult to find whether the target capacitance value has been reached.

[0119] It is understandable that when the assembly tool is designed, the assembly tool can be matched to the most common specifications of the spacing of the lenses 10. When the spacing of the lenses 10 to be assembled is of other specifications, the assembly tool can be used to first adjust the spacing of the lenses 10 to the most common specifications, and then the lenses 10 can be further adjusted using step S32 under the premise of this spacing.

[0120] For example, the assembly tool can only accurately adjust the thickness of the gap 13 between the two lenses 10 to 20 microns. When the target thickness of the gap 13 of the lens group 100 is 20 microns, the assembly tool can be directly used to adjust the thickness of the gap 13 of the lens group 100 to 20 microns. When the target thickness of the gap 13 of the lens group 100 is 15 microns, the assembly tool is first used to adjust the thickness of the gap 13 of the lens group 100 to 20 microns, and then the thickness of the gap 13 is reduced, and the capacitance of the capacitor 3 is synchronously detected. When the capacitance reaches the set range where the target capacitance value is located, it is determined that the thickness of the gap 13 is adjusted to 15 microns. Conversely, when the target thickness of the gap 13 of the lens group 100 is 25 microns, the assembly tool is first used to adjust the thickness of the gap 13 of the lens group 100 to 20 microns, and then the thickness of the gap 13 is increased, and the capacitance of the capacitor 3 is synchronously detected. When the capacitance reaches the set range where the target capacitance value is located, it is determined that the thickness of the gap 13 is adjusted to 25 microns.

[0121] Similarly, when the electrode group 20 is set to Figure 1 When the series capacitor group 30 is connected as shown, the adjustable pole distance d2 of the second capacitor 32 can also be adjusted to the initial distance d2_0 in step S31 to obtain the initial capacitance value C of the series capacitor group 30. total _0, obtain the target capacitance value C of the series capacitor group 30 corresponding to the target distance d2_2 total Then in step S32, when the capacitance C of the series capacitor group 30 is measured, total Reach the target capacitance value C total _2, it can be determined that the adjustable pole pitch d2 reaches the target distance d2_2, and the gap 13 reaches the target thickness.

[0122] In some specific embodiments, the target thickness of the gap 13 of the lens 10 is extremely small relative to the thickness of the lens 10, so the target distance d2_2 of the adjustable pole distance d2 is extremely small relative to the first pole distance d1 and the third pole distance d3. For example, in some solutions, the thickness of the lens 10 is at the millimeter level, while the thickness of the gap 13 of the lens 10 is at the micrometer level, which is a hundred times different. Therefore, in these embodiments, when calculating the capacitance C according to the adjustable pole distance d2, total can be further simplified.

[0123] See formula (3) for details. Usually, A1, A2, and A3 are close to or even equal to each other, and the relative dielectric constants of different media are not much different. Under normal conditions, the relative dielectric constant of glass is about 5-10 times that of gas. Therefore, the difference between ε1, ε3, and ε2 is not much.

[0124] When d2 is extremely different from d1 and d3, the second capacitor 32 and the third capacitor 33 can be regarded as being negligible or constant in the series circuit. In this case, the relationship (4) can be obtained.

[0125]

[0126] Further, Figure 5 The variation relationship curve between the capacitance C2 of the second capacitor 32 and the adjustable pole distance d2 is shown. According to the variation relationship curve, the calculation formula of the capacitance variation ΔC of the series capacitor group 30 with respect to the distance variation Δd of the adjustable pole distance d2 can be obtained by using the calculus algorithm to fit the curve, as shown in relational formula (5).

[0127]

[0128] Where, the capacitance change ΔC is the target capacitance value C total _2 and initial capacitance C total _0, the distance change Δd is the difference between the initial distance d2_0 and the target distance d2_2.

[0129] According to the relation (5), when the adjustable pole distance d2 of the second capacitor 32 is adjusted to the initial distance d2_0, the initial capacitance value C of the series capacitor group 30 is total _0, according to the distance change Δd, the capacitance change ΔC is obtained, so that the capacitance C of the monitored series capacitor group 30 can be used total , it is determined that when the capacitance change reaches the capacitance change ΔC, the adjustable pole distance d2 is adjusted to the target distance d2_2.

[0130] Of course, the present application scheme is to connect the capacitor C of the series capacitor group 30 total When performing calculations, it is also possible not to use the simplified method of formula (5), but to directly use formula (3) to substitute all parameters into the formula for accurate calculations, so as to improve the accuracy of the calculation results.

[0131] In some embodiments, Figure 6 As shown, when the electrode group 20 is provided, a plurality of groups may be provided.

[0132] In the specific operation, in step S1, a plurality of first electrode bodies 21 are arranged on both sides of the first lens 11, and a plurality of second electrode bodies 22 are arranged on both sides of the second lens 12. The first electrode bodies 21 and the second electrode bodies 22 form a plurality of columns of electrode groups 20. In step S2, each column of electrode groups 20 is used as a series capacitor group 30. In step S3, when adjusting the lens 10, the capacitance C of each series capacitor group 30 is adjusted. total All measurements were taken.

[0133] In this way, when adjusting the thickness of the gap 13 of the lens 10, multiple points can be adjusted. In this way, each position of multiple points reaches the target thickness, and the overall thickness of the gap 13 of the lens 10 is controlled more accurately.

[0134] In addition, other tests can be performed using multiple series capacitor groups 30 at each point. For example, when the capacitance C of each series capacitor group 30 total If the two lenses 10 are equal, it can be determined that the two lenses 10 are in a parallel state, or in other words, the optical axes L of the two lenses 10 are in a parallel state.

[0135] For another example, when adjusting the lens 10 to tilt the lens 10 to a certain extent, the capacitance C of the capacitor group 30 connected in series at different points is observed. total The capacitance change ΔC can be used to determine whether the optical axes L of the two lenses 10 are parallel, that is, whether one lens 10 is tilted relative to the other lens 10. In addition, it can also be deduced whether the state of the electrode body 2 is qualified (such as whether the electrode sheets are parallel), and if unqualified, the state of the electrode body 2 is adjusted.

[0136] For example, when the lens 10 is translated, the capacitors C of the capacitor group 30 connected in series at different points can be used. total The capacitance change ΔC is used to determine whether the two lenses 10 are eccentric.

[0137] Therefore, in step S3, the action of adjusting the lens 10 may include translating the lens 10 in a direction parallel to the optical axis L, which can be used to adjust the thickness of the gap 13 of the lens 10. When there are at least two series capacitor groups 30, the action of adjusting the lens 10 may also include translating the lens 10 in a direction perpendicular to the optical axis L, or tilting the lens 10 relative to the optical axis L, etc.

[0138] In the embodiment of the present invention, when the electrode group 20 is arranged in multiple columns, the arrangement of the electrode group 20 can be variously arranged. For example, the multiple columns of electrode groups 20 are centrally symmetrically distributed relative to the optical axis L of the lens group 100. In this way, when the lens 10 is moved, the capacitance C of the multi-point series capacitor group 30 is observed. total The capacitance change ΔC makes it easier to determine whether the two lenses 10 are eccentric.

[0139] Optionally, the first electrode body 21 and the second electrode body 22 are both electrode sheets with equal areas, so that the electrode sheets are low in cost, easier to be arranged on the lens 10, and less likely to damage the strength of the lens 10. In addition, the electrode sheets have a certain area to ensure that the series capacitor group 30 has sufficient capacitance C total Changes can be measured and observed.

[0140] Of course, in the embodiment of the present invention, the structure of the electrode body 2 is not limited to the electrode sheet, and a mesh body or other capacitor structures known in the prior art may also be used, which is not limited here.

[0141] Furthermore, the first electrode body 21 is buried in the first lens 11 and has a flat surface, and the second electrode body 22 is buried in the second lens 12 and has a flat surface. This arrangement facilitates the determination of the plate spacing of each capacitor 3.

[0142] For example Figure 1 As shown, the adjustable pole distance d2 is equal to the thickness of the gap 13, and the first pole distance d1 is equal to the thickness of the lens 10 minus twice the thickness of the electric plate.

[0143] In addition, the electrode body 2 is buried in the lens 10 and has a flat surface, which is also helpful to keep the surface of the lens 10 smooth and flat and reduce scratches.

[0144] According to the alignment method of the lens 10 of the embodiment of the present invention, the control accuracy of the alignment of the lens 10 can be effectively improved by using this method. Moreover, when a plurality of series capacitor groups 30 are provided, the plurality of series capacitor groups 30 can also be used to monitor the tilt and eccentricity of the lens 10, thereby facilitating the adjustment of the lens group 100 in a direction coaxial with the lens 10.

[0145] The following describes an assembling method of a cemented lens assembly 100A according to an embodiment of the present invention with reference to the accompanying drawings.

[0146] According to the assembling method of the cemented lens assembly 100A of the second aspect of the present invention, refer to Figure 7 The steps include:

[0147] SX: The first lens 11 and the second lens 12 are stacked, with a gap 13 between the first lens 11 and the second lens 12;

[0148] SY: Align the first lens 11 and the second lens 12 according to the above alignment method;

[0149] SZ: After the alignment is completed, the gap 13 between the first lens 11 and the second lens 12 is filled with the colloid 40 to form a glued lens assembly 100A.

[0150] After strictly controlling the thickness of the gap 13 of the lens 10 by the above alignment method, the glue is injected, which can improve the control accuracy of the thickness of the glue 40 and reduce the influence of poor thickness control caused by injection molding process errors.

[0151] In some specific embodiments, Figure 8 As shown, the assembly of the glued lens assembly 100A includes the following steps:

[0152] SX1: overlap two lenses 10 in the lens assembly 100 to form a gap 13;

[0153] SY1: measuring the capacitance of the capacitor 3 on the mirror assembly 100;

[0154] SY2: offset one of the lenses 10 so that the capacitance of the capacitor 3 reaches the target capacitance value corresponding to the target distance d2_2;

[0155] SY3: Measure the capacitance of capacitor 3 during adjustment; if the measurement result reaches the target capacitance value, enter SY5; if the measurement result does not reach the target capacitance value, enter SY4;

[0156] SY4: Tilt and move the lens 10 to confirm whether the electrode body 2 is parallel and overlapped, and then return to SY2;

[0157] SY5: Complete the alignment of the lens 10.

[0158] After the alignment is completed, SZ is performed: the gap 13 between the first lens 11 and the second lens 12 is filled with glue 40 to form a glued lens assembly 100A.

[0159] The following describes a lens 10 according to an embodiment of the present invention with reference to the accompanying drawings. The lens 10 is used to implement the above alignment method.

[0160] The lens 10 according to the third aspect of the present invention is as follows: Fig. 9 As shown, an electrode body 2 is provided on the lens 10. Specifically, electrode bodies 2 are provided on opposite sides of the lens 10, and the electrode bodies 2 on both sides are arranged in a direction parallel to the optical axis L of the lens 10. In this way, the electrode bodies 2 on the lens 10 can be used as capacitors 3 during the alignment process to accurately adjust the thickness of the spacer 13.

[0161] Specifically, the electrode body 2 is buried in the lens 10, and one side surface of the electrode body 2 is flush with the surface of the lens 10. This arrangement facilitates the determination of the plate spacing of each capacitor 3. The electrode body 2 is buried in the lens 10 and the surface is flush, which is also conducive to keeping the surface of the lens 10 smooth and flat, reducing scratches.

[0162] Optionally, a plurality of electrode bodies 2 are provided on each side of the lens 10, and the plurality of electrode bodies 2 are centrally symmetrically distributed relative to the optical axis L of the lens 10. Thus, when the lens 10 is moved, the capacitance C of the multi-point series capacitor group 30 is observed. total The capacitance change ΔC can be used to more easily determine whether the two lenses 10 are eccentric. It can also be deduced whether the state of the electrode body 2 is qualified (such as whether the electrode sheets are parallel), and if unqualified, the state of the electrode body 2 is adjusted.

[0163] According to the fourth aspect of the present invention, the cemented lens assembly 100A is as follows: Fig.10 As shown, at least two lenses 10 of the above embodiment are included, and the gap 13 between two adjacent lenses 10 is filled with colloid 40. Therefore, the control accuracy of the thickness of the colloid 40 can be improved, and the display image quality can be improved.

[0164] According to a fifth aspect of the present invention, a display device 1000 is Fig.11 As shown, it comprises: a housing and a lens arranged in the housing. The lens comprises at least two lenses 10 of the above-mentioned embodiment, or comprises a cemented lens group 100A of the above-mentioned embodiment.

[0165] Therefore, by improving the control accuracy of the thickness of the gap 13, the quality of the display image is improved.

[0166] The structures and operating principles of other components of the display device 1000 according to the embodiment of the present invention, such as a display screen and a controller, are well known to those skilled in the art and will not be described in detail here.

[0167] In the description of this specification, the description with reference to the terms "embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0168] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for aligning a lens assembly, wherein the lens assembly comprises two lenses, namely a first lens and a second lens, and a gap is provided between the two lenses, wherein: The alignment method comprises the following steps: S1: a first electrode body is arranged on the first lens, and a second electrode body is arranged on the second lens, wherein the first electrode body and the second electrode body are arranged in a direction parallel to the optical axis of the lens group to form a column of electrode groups; S2: using the electrode group as a capacitor, and using the distance between the first electrode body and the second electrode body opposite to each other on both sides of the gap as an adjustable electrode distance; S3: According to the change relationship between the capacitance of the capacitor and the plate spacing, the lens is adjusted and the capacitance of the capacitor is measured, and according to the change of the measurement result, the adjustable plate spacing is adjusted to the target distance so that the gap reaches the target thickness.

2. The alignment method according to claim 1, characterized in that: Step S3 includes the following steps: S31: adjusting the adjustable pole distance to an initial distance to obtain an initial capacitance value of the capacitor; According to the change relationship between the capacitance and the plate spacing of the capacitor, obtaining a target capacitance value of the capacitor corresponding to the adjustable plate spacing at the target distance; S32: adjusting the lens until the measured capacitance of the capacitor reaches a set range where the target capacitance value is located.

3. The alignment method according to claim 1, characterized in that: When the first electrode body is provided in step S1, the first electrode bodies are provided on two opposite sides of the first lens respectively; When the second electrode bodies are arranged in step S1, the second electrode bodies are arranged on opposite sides of the second lens, respectively, so that two first electrode bodies and two second electrode bodies in the same column of the electrode group are arranged in a direction parallel to the optical axis of the lens group; When the electrode group is used as a capacitor in step S2, two first electrode bodies opposite to each other on the first lens are used as a first capacitor, the first electrode body and the second electrode body opposite to each other on both sides of the gap are used as a second capacitor, two second electrode bodies opposite to each other on the second lens are used as a third capacitor, the first capacitor, the second capacitor and the third capacitor are used as a series capacitor group, and the distance between the first electrode body and the second electrode body of the second capacitor is used as the adjustable electrode distance; When measuring the capacitance of the capacitor in step S3, the capacitance of the series capacitor group is measured.

4. The alignment method according to claim 3, characterized in that: In step S1, a plurality of the first electrode bodies are disposed on both sides of the first lens, and a plurality of the second electrode bodies are disposed on both sides of the second lens, and the first electrode bodies and the second electrode bodies form a plurality of columns of the electrode groups; In step S2, each column of the electrode groups is used as a series capacitor group; In step S3, the capacitance of each of the series capacitor groups is measured when the lens is adjusted.

5. The alignment method according to claim 4, characterized in that: The plurality of rows of electrode groups are centrally symmetrically distributed relative to the optical axis of the mirror group.

6. The alignment method according to any one of claims 1 to 5, characterized in that: In step S3, adjusting the lens includes translating along a direction parallel to the optical axis, translating along a direction perpendicular to the optical axis, and tilting the lens.

7. The alignment method according to any one of claims 1 to 5, characterized in that: The first electrode body and the second electrode body are electrode sheets with equal areas.

8. The alignment method according to any one of claims 1 to 5, characterized in that: The first electrode body is buried in the first lens and has a flat surface, and the second electrode body is buried in the second lens and has a flat surface.

9. A method for assembling a glued lens assembly, characterized in that: The steps include: Overlaying a first lens and a second lens, with a gap between the first lens and the second lens; Aligning the first lens and the second lens according to the alignment method according to any one of claims 1 to 8; After the alignment is completed, the gap between the first lens and the second lens is filled with colloid to form a glued lens set.

10. A lens for implementing the alignment method according to any one of claims 1 to 8, characterized in that: An electrode body is arranged on the lens.

11. The lens according to claim 10, characterized in that: The electrode bodies are disposed on opposite sides of the lens, and the electrode bodies on the two sides are arranged in a direction parallel to the optical axis of the lens.

12. The lens according to claim 10, characterized in that The electrode body is buried in the lens, and one side surface of the electrode body is flush with the surface of the lens.

13. The lens according to any one of claims 10 to 12, characterized in that: A plurality of electrode bodies are provided on each side of the lens, and the plurality of electrode bodies are centrally symmetrically distributed relative to the optical axis of the lens.

14. A cemented lens assembly, characterized in that: The invention comprises at least two lenses according to any one of claims 10 to 13, wherein a gap between two adjacent lenses is filled with colloid.

15. A display device, characterized in that: include: A housing and a lens arranged in the housing, wherein the lens comprises at least two lenses according to any one of Claims 10-13, or comprises a cemented lens group according to Claim 14.

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