Solvent composition and camera module using same

Abstract

The solvent composition includes a first solvent and a second solvent. The first solvent includes at least one solvent selected from a first group having a swelling ratio of 60% or more, and the second solvent includes at least one solvent selected from a second group having a swelling ratio of less than 60%.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority from Korean Patent Application No. 10-2023-0085455 filed on July 3, 2023, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety for all purposes by reference. Technical Field

[0003] The following description relates to a solvent composition and a camera module using the solvent composition. Background Art

[0004] The camera module may include a lens. For example, a high-resolution camera module may include four or more lenses disposed in a lens barrel.

[0005] The camera module may include a component that prevents the lens disposed in the lens barrel from being separated. For example, the camera module may include a press-fit ring or an adhesive for fixing the lens to the lens barrel.

[0006] However, conventional adhesives used in optical modules are generally UV curing adhesives, heat curing adhesives, or UV heat curing adhesives, which may be quite expensive per unit gram (g). In addition, curing and shrinkage of the adhesive may cause changes in the modulation transfer function (MTF) of the lens or non-curing of the core, which may increase the defect rate of the camera module.

[0007] When the lens is secured by a press-fit ring, the typical bonding force (or restraining force) between the press-fit ring and the lens barrel is insufficient.

[0008] The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with respect to the present disclosure. Summary of the invention

[0009] The purpose of providing this summary is to introduce a selection of concepts in a concise form, and these concepts will be further described in the following detailed description. This summary is not intended to identify the key features or essential features of the claimed subject matter, nor is it intended to be used to help determine the scope of the claimed subject matter.

[0010] In one general aspect, the solvent composition includes a first solvent including at least one solvent selected from a first group having a swelling ratio of 60% or more and a second solvent including at least one solvent selected from a second group having a swelling ratio of less than 60%.

[0011] The first solvent may be at least one of dichloromethane (MC) and tetrahydrofuran (THF), and the second solvent may be at least one of ethyl acetate (EA), methyl ethyl ketone (MEK), and acetone (AC).

[0012] The first solvent may be THF and the second solvent may be MEK.

[0013] The solvent composition may include 70% to 95% by volume of MEK and 5% to 30% by volume of THF.

[0014] The camera module includes a lens barrel accommodating a plurality of lenses and a press-fit ring disposed in the lens barrel to support the plurality of lenses. The solvent composition may be used to couple the press-fit ring to the lens barrel.

[0015] In another general aspect, a camera module includes: a plurality of lenses; a lens barrel in which an accommodation space for accommodating the plurality of lenses is formed; and a press-fit ring bonded to the lens barrel by a solvent composition including a first solvent selected from a first group having a swelling ratio of 60% or more and a second solvent selected from a second group having a swelling ratio of less than 60%.

[0016] The first solvent may be at least one of dichloromethane (MC) and tetrahydrofuran (THF), and the second solvent may be at least one of ethyl acetate (EA), methyl ethyl ketone (MEK), and acetone (AC).

[0017] The first solvent may be THF and the second solvent may be MEK.

[0018] The solvent composition may include 70% to 95% by volume of MEK and 5% to 30% by volume of THF.

[0019] The plurality of lenses may include a first lens group and a second lens group, the first lens group including a front lens disposed closest to the object, and the second lens group including a rear lens disposed closest to the imaging surface. The lens barrel may include a first accommodation space for accommodating the first lens group and a second accommodation space for accommodating the second lens group.

[0020] A gap maintaining member may be disposed between the first lens group and the second lens group.

[0021] In another general aspect, the solvent composition includes: a first solvent consisting of at least one solvent selected from a first group having a swelling ratio of 60% or more; and a second solvent consisting of at least one solvent selected from a second group having a swelling ratio of less than 60%.

[0022] Other features and aspects will become apparent from the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a cross-sectional view of a camera module according to an embodiment.

[0024] Figure 2 yes Figure 1 An enlarged view of part A is shown in FIG.

[0025] Figure 3 yes Figure 1 A bottom view of the camera module shown in FIG. 1 , viewed in direction V. FIG.

[0026] Figure 4 is a graph showing the swelling ratio and adhesion of a flat sample according to solvents.

[0027] Figure 5 is a graph showing changes in adhesion according to the volume content of THF in a mixed solvent of tetrahydrofuran (THF) and methyl ethyl ketone (MEK).

[0028] Figure 6 is a graph comparing the removal forces of a conventional solvent composition using an acetone solvent and a solvent composition using a mixed solvent of THF and MEK.

[0029] Figure 7 This is a graph comparing whether a conventional solvent composition using an acetone solvent and a solvent composition using a mixed solvent of THF and MEK remain.

[0030] Throughout the drawings and detailed description, unless otherwise described, the same reference numerals refer to the same elements. For purposes of clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative sizes, proportions, and depictions of elements in the drawings may be exaggerated. DETAILED DESCRIPTION

[0031] Hereinafter, although examples of the present disclosure will be described in detail with reference to the accompanying drawings, it should be noted that the examples are not limited thereto.

[0032] The following specific embodiments are provided to help the reader gain a comprehensive understanding of the methods, devices and / or systems described herein. However, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent after understanding the present disclosure. For example, the order of operations described herein is merely an example, and except for operations that must occur in a specific order, it is not limited to the order set forth herein, but can be changed, which will be apparent after understanding the present disclosure. In addition, for greater clarity and brevity, descriptions of features known in the art may be omitted.

[0033] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein are provided merely to illustrate some of the many possible ways to implement the methods, devices, and / or systems described herein that will be apparent after understanding the present disclosure.

[0034] Throughout the specification, when an element such as a layer, a region, or a substrate is described as being “on,” “connected to,” or “coupled to” another element, the element may be directly “on,” “connected to,” or “coupled to” the other element, or one or more other elements may be present between the element and the other element. Conversely, when an element is described as being “directly on,” “directly connected to,” or “directly coupled to” another element, no other elements may be present between the element and the other element.

[0035] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items; similarly, "at least one" includes any one of the associated listed items and any combination of any two or more items.

[0036] Although terms such as "first", "second" and "third" may be used herein to describe various members, components, regions, layers or portions, these members, components, regions, layers or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer or portion from another member, component, region, layer or portion. Therefore, without departing from the teachings of the examples described herein, the first member, first component, first region, first layer or first portion mentioned in these examples may also be referred to as the second member, second component, second region, second layer or second portion.

[0037] Spatially relative terms such as "above", "above", "below", "below", etc. may be used herein for descriptive convenience to describe the relationship of one element relative to another element as shown in the accompanying drawings. In addition to covering the orientations depicted in the accompanying drawings, these spatially relative terms are intended to also cover different orientations of the device in use or operation. For example, if the device in the accompanying drawings is flipped, an element described as being "above" or "above" another element relative to the other element will be "below" or "below" the other element relative to the other element. Therefore, depending on the spatial orientation of the device, the term "above" covers both orientations of "above" and "below". The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein should be interpreted accordingly.

[0038] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the terms "a", "an" and "the" are intended to include plural forms as well. The terms "include", "comprise" and "have" indicate the presence of the features, numbers, operations, components, elements and / or combinations thereof, but do not exclude the presence or addition of one or more other features, numbers, operations, components, elements and / or combinations thereof.

[0039] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0040] It should be noted that herein, use of the word “may” with respect to an example, such as regarding what an example may include or implement, means that there is at least one example in which such feature is included or implemented, and all examples are not limited thereto.

[0041] The features of the examples described herein may be combined in various ways that will be apparent after understanding the present disclosure. In addition, although the examples described herein have various configurations, other configurations that will be apparent after understanding the present disclosure are also possible.

[0042] The camera module described herein can be installed in a portable electronic product. For example, the camera module can be installed in a portable phone, a laptop computer, etc. However, according to the present disclosure, the scope of use of the camera module is not limited to the above electronic devices. For example, the camera module can be installed in all electronic devices that require screen imaging and video recording, such as motion detection, image capture, face recognition, iris recognition, virtual reality implementation, augmented reality implementation, etc.

[0043] According to the implementation mode, reference Figures 1 to 3 Describes the camera module.

[0044] The camera module 10 includes a plurality of lenses, a lens barrel 300 in which an accommodation space for accommodating the plurality of lenses is formed, and a press-fit ring 500 .

[0045] The lenses may be divided into a first lens group 100 and a second lens group 200. However, the configuration of the camera module 10 is not limited to the above configuration.

[0046] For example, the camera module 10 may further include a filter (not shown), an image sensor (not shown), etc. In addition, the camera module 10 may further include a driving device for driving the lens barrel 300 in the optical axis or in a direction intersecting the optical axis.

[0047] The first lens group 100 may include one or more lenses. For example, the first lens group 100 may include a frontmost lens 110 disposed closest to the object.

[0048] The frontmost lens 110 may include an optical portion 112 and a flange portion 114. The optical portion 112 is configured to exhibit optical performance, and the flange portion 114 is configured to enable position alignment of the lens.

[0049] For example, the optical portion 112 may be configured to have a positive refractive power or a negative refractive power, and the flange portion 114 may be configured to contact an adjacent lens or the lens barrel 300 .

[0050] The optical portion 112 may be exposed outside the lens barrel 300. For example, Figure 1 As shown in FIG. 3 , the optical portion 112 may be partially or completely exposed through the opening of the lens barrel 300 . In contrast, the flange portion 114 may be configured not to be exposed through the opening of the lens barrel 300 .

[0051] The frontmost lens 110 may be disposed in the innermost portion of the lens barrel 300. The frontmost lens 110 may contact a plurality of different inner surfaces of the first receiving space 310 described later.

[0052] For example, an object-side surface of the flange portion 114 may contact an upper surface 312 of the first receiving space 310 , and an outer edge surface of the flange portion 114 may contact an inner surface 314 of the first receiving space 310 .

[0053] Therefore, the frontmost lens 110 may be aligned to coincide with the optical axis C of the lens barrel 300 by being mounted in the lens barrel 300 .

[0054] The first lens group 100 may include a plurality of lenses. For example, in addition to the front lens 110, the first lens group 100 may further include one or more lenses.

[0055] For reference, according to the present embodiment, the first lens group 100 may further include four lenses 120, 130, 140, and 150 in addition to the front lens 110. However, the number of lenses forming the first lens group 100 is not limited to five. For example, depending on the optical performance of the camera module 10, the first lens group 100 may include less than 5 lenses or include 6 or more lenses.

[0056] The lenses 110, 120, 130, 140, and 150 of the first lens group 100 may generally have larger diameters from the object side toward the imaging surface. For example, the second lens 120 may have a larger diameter than the first lens 110 (the frontmost lens), and the third lens 130 may have a larger diameter than the second lens 120.

[0057] However, the positions of the lenses 110, 120, 130, 140, and 150 and the sizes of the lenses 110, 120, 130, 140, and 150 are not necessarily proportional. For example, the fourth lens 140 and the third lens 130 may be formed to be substantially the same size. Among the lenses of the first lens group 100, the lens disposed closest to the second lens group 200 may generally have the largest diameter. For example, in the present embodiment, the fifth lens 150 may have a larger diameter than the first lens 110 to the fourth lens 140.

[0058] The second lens group 200 may include one or more lenses. For example, the second lens group 200 may include a final lens 280 disposed closest to the imaging surface. The final lens 280 may include an optical portion 282 and a flange portion 284.

[0059] The optical portion 282 is configured to present optical performance, and the flange portion 284 is configured to enable position alignment of the lens. For example, the optical portion 282 can be configured to have positive refractive power or negative refractive power, and the flange portion 284 can be configured to contact the lens barrel 300. The peripheral surface of the flange portion 284 can be configured to be substantially parallel to the optical axis C.

[0060] The lens barrel 300 is configured to accommodate therein the first lens group 100 and the second lens group 200. For example, a first accommodation space 310 and a second accommodation space 320 may be formed inside the lens barrel 300.

[0061] The first receiving space 310 is configured to receive the first lens group 100. For example, the first receiving space 310 may be formed to have a considerable size to receive the lenses 110, 120, 130, 140, and 150 of the first lens group 100.

[0062] Steps may be formed in the first accommodation space 310. For example, a plurality of steps may be formed in the first accommodation space 310 to specify accommodation positions of the first to fifth lenses 110 to 150. The steps may be formed to have different sizes. For example, each of the steps may be formed to substantially match the size of the first to fifth lenses 110 to 150.

[0063] The second receiving space 320 is configured to receive the second lens group 200. For example, the second receiving space 320 may be formed to receive the last lens 280 of the second lens group 200.

[0064] The camera module 10 may further include a gap maintaining member 400. The gap maintaining member 400 may be disposed between the first lens group 100 and the second lens group 200.

[0065] For example, the gap maintaining member 400 may be disposed between the fifth lens 150 and the final lens 280. In this case, the gap maintaining member 400 may maintain a distance between the fifth lens 150 and the final lens 280 in the optical axis direction to be constant.

[0066] In addition, the gap maintaining member 400 may serve to increase a coupling force between the final lens 280 and the lens barrel 300 by acting a force on the final lens 280 in a direction of an imaging plane or transferring a force to the final lens 280 .

[0067] The camera module 10 configured as above can improve the bonding force between the lens barrel 300 and the final lens 280 , so that the phenomenon that the final lens 280 and other lenses are separated from the lens barrel 300 due to external impact can be significantly reduced.

[0068] The press-fit ring 500 is installed to fix the last lens 280 of the second lens group 200 and the lens barrel 300 .

[0069] The press-fit ring 500 may be configured in the form of an annular ring, may be installed in the lens barrel 300 to press-fit and fix the lens and support the lower edge portion of the lens, and may have a plurality of support portions formed to extend directly below the inner peripheral surface thereof.

[0070] The press-fit ring 500 and the lens barrel 300 are bonded to each other using a solvent bonding technique by applying a solvent composition 600 between the press-fit ring 500 and the lens barrel 300 .

[0071] According to an embodiment of the present disclosure, the solvent composition 600 is used to assemble the lens and the lens barrel 300 in the camera module 10 using a simple and economical method of combining thermoplastic resins called solvent bonding technology. In the present disclosure, more specifically, the optimized solvent composition 600 is applied to the bonding area between the press-fit ring 500 and the lens barrel 300, softened, and then pressed together to combine the press-fit ring 500 and the lens barrel 300.

[0072] This solvent joining technique has the advantage of rapid bonding through solvent evaporation simply by heating the solvent to an appropriate temperature rather than using separate curing equipment such as a UV device.

[0073] Generally, acetone (AC) or ethyl acetate (EA) is used as a bonding solvent. When acetone and ethyl acetate are used on a product having a small diameter, it is difficult to ensure an adhesive area, and there is a concern that the removal force may be insufficient.

[0074] Therefore, the present disclosure discloses a solvent composition having stronger adhesion than the existing AC and EA, so that the applicability can be expanded to various models, such as models with small diameters, etc.

[0075] Taking this into consideration, in the present disclosure, first, basic physical properties of lens barrel and press-fit ring resins (e.g., polycarbonate (PC) series) and candidate organic solvents are evaluated to classify various solvents, and adhesion on samples and products is evaluated to select a solvent composition.

[0076] Solvent bonding techniques ultimately improve bonding by increasing polymer chain mobility by the solvent as well as polymer diffusion and rearrangement at the interface. For this reason, the selection of a suitable solvent with high reactivity with the target polymer is of utmost priority.

[0077] To this end, the basic physical properties of the solvent are determined by measuring the swelling ratio of the polymer with the solvent and evaluating the spreading of the solvent on the polymer surface.

[0078] It is generally known that the larger the adhesion area and dissolving power, the better the adhesion. To this end, in an embodiment, two or more solvents are mixed instead of a single solvent to ensure physical properties, and adhesion evaluation is performed for each composition to select an excellent solvent.

[0079] In view of this, the solvent composition 600 of the embodiment is composed of two types of solvents. In this case, the first solvent with a high swelling ratio increases the swelling solubility of the resin, causing more surface dissolution of the resin, and as a result, when the solvent is removed, the miscibility between the two materials increases, thereby improving adhesion.

[0080] The first solvent includes at least one solvent selected from a first group having a high swelling ratio, and the solvent of the first group has a swelling ratio of 60% or more.

[0081] In addition, the solvent of the first group may be at least one of dichloromethane (MC) and tetrahydrofuran (THF).

[0082] The second solvent includes at least one solvent selected from a second group having a low swelling ratio, and the solvent of the second group has a swelling ratio of less than 60%.

[0083] In addition, the solvent of the second group may be at least one of ethyl acetate (EA), methyl ethyl ketone (MEK), and acetone (AC).

[0084] Among the five solvents AC, EA, MEK, MC, and THF, for the swelling ratio, MC>THF>MEK≈EA>AC, and for the spreadability, AC>EA≈MEK>THF≈MC.

[0085] The solvent composition 600 of this embodiment may include MEK and THF, and may include 70 to 95% by volume of MEK and 5 to 30% by volume of THF.

[0086] In this case, when the content of MEK is less than 70% by volume, the surface of the resin to be bonded may be whitened, resulting in problems with product appearance, and when the content of MEK exceeds 95% by volume, there is substantially no effect in improving adhesion.

[0087] Conventional lenses and lens barrels are bonded using a heat-curing adhesive utilizing UV.

[0088] Specifically, after applying the thermal curing adhesive, the 2 or less UV pre-curing heat-curing adhesive, and then heat curing at 90° C. for 30 minutes to cure the adhesive. In this case, an adhesive force of 15 kgf or less can be provided.

[0089] When using solvent bonding technology instead of UV, acetone is generally used as a solvent. Specifically, the solvent bonding technology is performed by simply applying acetone solvent to the bonding area and drying it, and through this process, an adhesion force of 16kgf can be provided.

[0090] In an embodiment of the present disclosure, the press-fit ring 500 and the lens barrel 300 are fixed using a solvent bonding technique, and the solvent composition 600 used at this time includes a first solvent and a second solvent, the first solvent includes at least one solvent selected from a first group having a swelling ratio of 60% or more, and the second solvent includes at least one solvent selected from a second group having a swelling ratio of less than 60%.

[0091] The solvent composition 600 configured as described above may be applied to a region where the press-fit ring 500 and the lens barrel 300 are bonded thereto, and dried at a temperature ranging from 60° C. to 90° C. for 20 minutes, thereby obtaining an adhesive force of 19 kgf.

[0092] Hereinafter, it is intended to confirm the excellent effect of the solvent composition 600 of the present disclosure by comparing the solvent composition 600 according to the present disclosure with the conventional case of using a solvent of AC.

[0093] Test Example 1

[0094] In order to compare the adhesion according to the solvent characteristics, the swelling ratio and adhesion of the flat sample were measured for five types of solvents AC, EA, MEK, THF and MC, and are shown in Figure 4 middle.

[0095] For the swelling rate, five types of solvents AC, EA, MEK, THF, and MC were prepared. Depending on the time, 1 ml of each solvent was dispensed into 1 g of polymer pellets and waited for 10 minutes. Then, the weight of the pellets was measured, and the increase and decrease in weight before / after the wait were compared to calculate the swelling rate as shown in the following equation 1.

[0096] Equation 1: Swelling ratio = ((weight after waiting - initial weight) / initial weight) × 100

[0097] The adhesion of the samples was measured after producing a flat plate and a sample having a diameter of 4 mm, and applying and pressing five types of solvents. Specifically, 1 μl of the solvent was applied between the contact surface of the sample and the flat plate under a pressure of 0 to 0.1 kgf, heated and dried at 90°C for 20 minutes, and then the adhesion of each solvent was measured using a tape tester.

[0098] Reference Figure 4 , it can be seen that MC and THF with high swelling ratios have high adhesion when the solvents are pre-applied to the bonding surface and pressed.

[0099] On the other hand, it can be seen that MEK, EA and AC have relatively low swelling ratios and good spreadability on the surface when compared to other solvents. It can be seen that MEK, EA and AC show excellent adhesion when separated, as if the solvent was injected into the gap between the samples using a jet device after pressing. Therefore, it is expected that the solvent composition obtained by mixing two types of solvents has better adhesion than the solvent composition containing only one type of solvent.

[0100] Test Example 2

[0101] In order to evaluate the lens product, a solvent composition was prepared by mixing THF having an excellent swelling rate and MEK having excellent spreadability, and the adhesion to the sample was measured.

[0102] The solvent composition was screened at 0, 30%, 70% and 100% by volume of high swelling THF. A detailed evaluation was then performed by varying the content of high swelling THF in the composition consisting of THF and MEK from 10% to 50% by volume.

[0103] Figure 5 is a graph showing changes in adhesion according to the volume content of THF in a mixed solvent of THF and MEK. Figure 5 , it can be seen that generally the lower the volume content of THF is relatively, the higher the adhesion is, and the adhesion is relatively most excellent within the composition range of 5% to 30% by volume of THF.

[0104] The removal force for a mixed solvent composition of MEK and THF was measured after an actual lens-barrel was assembled using a solvent dispenser, and compared.

[0105] This removal force was obtained by producing a sample using an automatic dispenser and applying a solvent under the conditions of a stroke of 54%, a line speed of 8 mm / s, and a pressure of 10 kPa. The coated sample was pressed again at 65° C. with 0.1 kgf for 5 seconds, pre-dried, and then secondary dried at 90° C. for 20 minutes.

[0106] The press-fit ring of the sample model was designed to have a clearance of -3 μm compared to the lens barrel. The removal force of the product was measured using a push-pull gauge at a speed of 12 mm / min.

[0107] Figure 6 is a graph showing a comparison of removal force between adhesion force using a conventional acetone solvent and adhesion force using a mixed solvent of THF and MEK of the present disclosure.

[0108] Reference Figure 6 , when the AC single solvent in the prior art is used, the removal force is about 11 kgf, and when the mixed solvent of the embodiment is used, the removal force is about 14 kgf. It can be seen that when the MEK-THF mixed solvent composition of the embodiment (mixing ratio MEK:THF=9:1) is used, the removal force is excellent compared to the conventional bonding method using the AC single solvent.

[0109] Test Example 3

[0110] After the lens product was adhered, it was evaluated whether the coated solvent remained by GC-MS analysis.

[0111] Reference Figure 7 , as in an embodiment, after applying a mixed solvent composition of MEK and THF, the mixed solvent still remains in a portion to which the mixed solvent is applied or inside the lens barrel 300 even after drying at 90° C. for 20 minutes and is detected under heating conditions at 200° C.

[0112] Therefore, as described above, through Test Examples 1 to 3, it can be confirmed that when the press-fit ring 500 and the lens barrel 300 are bonded using the solvent composition in which the first solvent and the second solvent of the embodiment are mixed, excellent adhesion and removal forces are obtained.

[0113] As described above, according to the present disclosure, the solvent composition can be formed by mixing two types of solvents with different swelling rates. The solvent composition according to the present disclosure can be used to join optical modules, and can also be used to join other components. For example, by applying the solvent composition between the press-fit ring 500 and the lens barrel 300, the effect of reducing the phenomenon of the lens being separated from the lens barrel 300 due to external impact can be improved.

[0114] As a result of evaluating the adhesion of the product, when the lens is fixed by combining the press-fit ring 500 and the lens barrel 300 using a solvent composition including the first solvent and the second solvent of the mixed composition developed in the present disclosure, the adhesion can be improved by about 30% compared to a conventional acetone solvent.

[0115] Therefore, if the bonding force between the lens and the lens barrel increases, the drop reliability of a single lens is improved and the change in resolution in a subsequent heat treatment is reduced, so that the effect of reducing the defect rate during the manufacturing process of the camera module can be expected.

[0116] An aspect of the present disclosure is to provide a solvent composition that can prevent a lens from being separated from a lens barrel by improving a bonding force and a removal force between the lens and the lens barrel, and a camera module using the same.

[0117] Although specific examples have been shown and described above, it will be apparent after understanding the present disclosure that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are understood in a descriptive sense only and not for limiting purposes. The description of the features or aspects in each example should be considered to be applicable to similar features or aspects in other examples. If the described techniques are performed in a different order, and / or if the components in the described system, architecture, device or circuit are replaced or supplemented in a different manner and / or by other components or their equivalents, appropriate results can still be achieved. Therefore, the scope of the present disclosure is not limited by specific embodiments, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be understood to be included in the present disclosure.

Claims

1. A solvent composition comprising: a first solvent including at least one solvent selected from a first group having a swelling ratio of 60% or more; as well as The second solvent includes at least one solvent selected from the second group having a swelling ratio of less than 60%.

2. The solvent composition according to claim 1, wherein The first solvent is at least one of dichloromethane and tetrahydrofuran, and The second solvent is at least one of ethyl acetate, methyl ethyl ketone and acetone.

3. The solvent composition according to claim 2, wherein The first solvent is tetrahydrofuran, and the second solvent is methyl ethyl ketone.

4. The solvent composition according to claim 3, wherein The solvent composition includes 70% to 95% by volume of methyl ethyl ketone and 5% to 30% by volume of tetrahydrofuran.

5. A camera module, comprising: a lens barrel, housing a plurality of lenses; as well as a press-fit ring disposed in the lens barrel to support the plurality of lenses, wherein the press-fit ring is coupled to the lens barrel using the solvent composition of claim 1.

6. A camera module, comprising: Multiple lenses; a lens barrel in which a receiving space for receiving the plurality of lenses is formed; as well as A press-fit ring is bonded to the lens barrel by a solvent composition including a first solvent selected from a first group having a swelling ratio of 60% or more and a second solvent selected from a second group having a swelling ratio of less than 60%.

7. The camera module according to claim 6, wherein: The first solvent is at least one of dichloromethane and tetrahydrofuran, and The second solvent is at least one of ethyl acetate, methyl ethyl ketone and acetone.

8. The camera module according to claim 7, wherein: The first solvent is tetrahydrofuran and the second solvent is methyl ethyl ketone.

9. The camera module according to claim 8, wherein: The solvent composition includes 70% to 95% by volume of methyl ethyl ketone and 5% to 30% by volume of tetrahydrofuran.

10. The camera module according to claim 6, wherein: The plurality of lenses include a first lens group and a second lens group, the first lens group includes a front lens disposed closest to the object, the second lens group includes a rear lens disposed closest to the imaging surface, and Wherein, the lens barrel comprises a first accommodating space for accommodating the first lens group and a second accommodating space for accommodating the second lens group.

11. The camera module according to claim 10, further comprising: A gap maintaining member is provided between the first lens group and the second lens group.

12. A solvent composition comprising: a first solvent consisting of at least one solvent selected from the first group having a swelling ratio of 60% or more; as well as The second solvent consists of at least one solvent selected from the second group having a swelling ratio of less than 60%.

13. The solvent composition according to claim 12, wherein The first solvent is at least one of dichloromethane and tetrahydrofuran, and The second solvent is at least one of ethyl acetate, methyl ethyl ketone and acetone.

14. The solvent composition according to claim 13, wherein The first solvent is tetrahydrofuran, and the second solvent is methyl ethyl ketone.

15. A camera module, comprising: a lens barrel, housing a plurality of lenses; as well as a press-fit ring disposed in the lens barrel to support the plurality of lenses, wherein the press-fit ring is coupled to the lens barrel using the solvent composition of claim 12.

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