JP2012230230A - Lens unit and assembly method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for assembling a lens unit in which a whitening phenomenon of an instant adhesive is hard to occur and a lens unit capable of suppressing the whitening phenomenon of the instant adhesive without requiring a complicate process.SOLUTION: A lens unit 10 comprises a lens barrel 1 having a lens 9 inside thereof, and a decoration member 2 fitted to the lens barrel 1. Two adhesive reservoirs 3 comprising a recess are provided in the outer periphery of the lens barrel 1. A space between the lens barrel 1 and the decoration member 2 in the adhesive reservoirs 3 is provided so as to be kept at an interval where the curing phenomenon of the instant adhesive is properly generated, and after coating the instant adhesive on the adhesive reservoirs 3, the decoration member 2 is fitted and adhered to the lens barrel 1.

Description

  The present invention relates to a lens unit and an assembling method thereof, and, for example, relates to a lens unit in which a lens barrel and an appearance member are fixed with an instantaneous adhesive and an assembling method thereof.

  In the exterior part of the lens barrel of the camera lens unit, the purpose of the lens barrel is to improve the quality, to improve the rigidity of the lens barrel, to cover the barrel mechanism or screw tightening at the tip of the lens barrel, etc. There is a case in which a decorative member is provided at the tip. In that case, the lens barrel is generally made of plastic, and the decorative member is generally made of metal. To fix the two members together, a press-fitting method using an interference fit or a method using a double-sided tape or an adhesive is employed. It is normal to do. As an example in the case of bonding using an adhesive, the method described in Patent Document 1 can be mentioned. In addition, a method of fixing by sandwiching a plurality of components without using an adhesive or an adhesive tape has been proposed (see, for example, Patent Document 2).

  The press-fitting method using a simple fit requires a high degree of accuracy for each member dimension, and a shrinkage difference due to a difference in material occurs as the environmental temperature changes, resulting in a weak press input. There is also a fear of falling off. In the fixing method using the double-sided tape, the adhesive surface of the double-sided tape sticks to the member in the middle of inserting the decorative member into the lens barrel, and the double-sided tape may be deformed or floated without being completely inserted. there's a possibility that. For this reason, care must be taken during assembly. In the fixing method by sandwiching a plurality of parts, a complicated configuration is required. In recent years, since the lens unit is required to be light and small, it is difficult to adopt such a configuration.

  As a fixing method using an adhesive, an epoxy resin-based, silicon-based, or instantaneous curing adhesive is generally used. When an epoxy resin-based adhesive or a silicon-based adhesive is used, it is necessary to hold the decorative member for a long time so that the decorative member does not float on the lens barrel until the adhesive is cured. On the other hand, when an instantaneous curing type adhesive (that is, an instantaneous adhesive) is used, since the adhesive is cured in a short time, the holding for a long time is unnecessary. Therefore, the working method is not complicated. However, if it is not completely cured, gas is generated from the uncured part and reacts with moisture in the air over time, and adheres to the exterior part of the lens barrel and decorative member, resulting in poor appearance (that is, whitening) Phenomenon).

  In the lens unit, when the whitening phenomenon occurs in the lens, the optical performance is deteriorated. For this reason, it is necessary to clean the lens. However, cleaning the lens requires a more complicated process than cleaning other components. Further, since this whitening phenomenon may occur while an uncured portion of the adhesive exists, it may occur after shipment even after passing through the inspection process. As a method to prevent this whitening phenomenon, the gas generated during the curing of the adhesive is sealed with a sealing adhesive and held in a lens frame, so that the lens surface is not affected by the gas and the optical performance of the lens. Patent Document 3 proposes a method for preventing the deterioration of the above.

JP 2003-248260 A JP 2007-65448 A JP-A-1-62606

  However, in the method proposed in Patent Document 3, the number of steps of applying a sealing adhesive increases, resulting in a complicated process and an increased cost. In addition, when the sealing adhesive is used for bonding a lens barrel external part, the sealing adhesive is visible, so that the appearance is unacceptably poor.

  The present invention has been made in view of such a situation, and its purpose is to suppress the instant adhesive whitening phenomenon without requiring a complicated process and a lens unit in which the instant adhesive whitening phenomenon is unlikely to occur. And a method of assembling a lens unit that can be performed.

  To achieve the above object, a lens unit assembling method according to a first aspect of the present invention is an adhesive comprising a concave portion in at least one of a lens barrel having a lens therein and an external member fitted to the lens barrel. An assembly method for a lens unit, in which an adhesive reservoir is provided and an instantaneous adhesive is applied to the adhesive reservoir, and then the outer appearance member is fitted and bonded to the lens barrel, and the lens barrel in the adhesive reservoir is The gap with the outer appearance member is provided so as to be maintained at an interval at which the instantaneous adhesive is appropriately cured.

  The lens unit assembling method of the second invention is characterized in that, in the first invention, the external member is a decorative member fixed to the tip of the lens barrel.

  A lens unit assembling method according to a third invention is characterized in that, in the first or second invention, the gap is 0.05 mm to 0.1 mm.

  A lens unit assembling method according to a fourth aspect of the present invention is the lens unit according to any one of the first to third aspects, wherein the adhesive reservoir is provided on at least one of an outer periphery of the barrel and an inner periphery of the external member. It is characterized by providing a plurality.

  The lens unit assembling method according to a fifth aspect of the present invention is characterized in that in the fourth aspect of the present invention, 2 to 4 adhesive reservoirs are provided.

  A lens unit assembling method according to a sixth aspect of the present invention is characterized in that, in the fourth or fifth aspect, the adhesive reservoir is provided at equal positions on the circumference.

  A lens unit assembling method according to a seventh invention is the method of assembling the lens unit according to any one of the first to sixth inventions, wherein a groove is provided around the adhesive reservoir, and the external member is fitted to the lens barrel. A curing accelerator that accelerates the curing of the instantaneous adhesive is applied to the groove.

  A lens unit according to an eighth aspect of the present invention is a lens unit having a lens barrel having a lens inside, and an external member fixed by an instantaneous adhesive while being fitted to the lens barrel, At least one of the outer appearance members is provided with an adhesive reservoir comprising a concave portion to which an instantaneous adhesive is applied, and a gap between the barrel and the outer appearance member in the adhesive reservoir is the instantaneous adhesive. It is provided so that it may be kept at the space | interval which generate | occur | produces the hardening phenomenon appropriately.

  By providing a gap between the lens barrel and the appearance member in the adhesive reservoir so that the instantaneous adhesive curing phenomenon is appropriately generated, an uncured portion of the instantaneous adhesive is prevented from being generated. It is possible to prevent whitening caused by insufficient curing of the adhesive. Accordingly, it is possible to suppress the whitening phenomenon of the instantaneous adhesive without requiring a complicated process, and it is possible to realize a lens unit in which the whitening phenomenon of the instantaneous adhesive is unlikely to occur. For example, even when the appearance member is a decorative member fixed to the tip of the lens barrel, it is possible to prevent the appearance from being deteriorated due to the whitening phenomenon. In addition, it is possible to clearly show the application position of the instantaneous adhesive to the operator by the adhesive pool, and the curing time is shortened by using the instantaneous adhesive, so the process time can be greatly shortened Become.

  By setting the gap between the lens barrel and the appearance member in the adhesive reservoir to 0.05 mm to 0.1 mm, the strength and curability of the adhesion can be improved. Providing a groove around the adhesive reservoir and applying a curing accelerator to the groove to accelerate the curing of the instantaneous adhesive before fitting the exterior member to the lens barrel, prevents the adhesive from sticking out. Curing of the instant adhesive at the uncured portion can be further promoted.

  By providing a plurality of adhesive reservoirs on at least one of the outer periphery of the lens barrel and the inner periphery of the outer appearance member, the lens barrel and the outer appearance member can be fixed stably and firmly. Furthermore, since the formation of the adhesive reservoir is performed not on the entire circumference but on a part of the circumference, it becomes easy to process the gap of the adhesive reservoir into a predetermined interval. At that time, by providing 2 to 4 adhesive reservoirs, it is possible to simplify the bonding process and reduce the cost of the auxiliary material. Further, by providing the adhesive reservoir at equal positions on the circumference, it is possible to reduce distortion of the lens barrel and the appearance member during bonding.

FIG. 3 is an assembly diagram illustrating an embodiment of a lens unit. The enlarged view which shows the formation part of the adhesive reservoir in FIG. 1 with an external appearance and a cross section. The enlarged view which shows the formation part of the adhesive reservoir in other embodiment with an external appearance and a cross section.

  Hereinafter, a lens unit embodying the present invention and an assembling method thereof will be described with reference to the drawings. In addition, the same code | symbol is mutually attached | subjected to the part which is the same in each embodiment etc., and the corresponding part, and duplication description is abbreviate | omitted suitably.

  FIG. 1 shows an embodiment of a lens unit 10 in a state in which a lens barrel 1 and a decorative member 2 are disassembled, and an essential part thereof is enlarged and shown in FIG. 2A is a plan view showing a portion where the adhesive reservoir 3 is formed, and FIG. 2B is a cross-sectional view taken along the line P-P ′ of FIG.

  The lens unit 10 is fixed by a lens barrel 1 having a lens 9 (FIG. 1, AX: optical axis) inside, and an instantaneous adhesive 5 (FIG. 2B) in a state of being fitted to the lens barrel 1. And a decorative member 2. The lens barrel 1 is made of plastic and is made by injection molding using a mold. The decorative member 2 is a metal appearance member, and is made, for example, by drawing a metal plate having a thickness of 0.2 mm.

  A decorative member 2 is attached to the distal end portion of the lens barrel 1 in a fitted state for the purpose of blinding a barrier mechanism (not shown) and improving the quality of the appearance. That is, the distal end portion of the lens barrel 1 (that is, the portion to which the decorative member 2 is attached) has a stepped shape so as to reduce the diameter (FIG. 2B). At the distal end of the lens barrel 1, adhesive reservoirs 3 made of concave portions are provided at two positions 180 degrees equally on the circumference (FIG. 1), and the instantaneous adhesive 5 is attached to each adhesive reservoir 3. After the coating, the decorative member 2 is fitted and bonded to the lens barrel 1 to complete the fixing of the decorative member 2 to the lens barrel 1.

  By disposing the adhesive reservoir 3 at the 180-degree equally divided position as described above, it is possible to suppress distortion of the lens barrel 1 and the decorative member 2 that occurs when the instantaneous adhesive 5 is cured. Moreover, a collimation convex part may be provided in the front-end | tip part (however, the position different from the adhesive reservoir 3) of the lens-barrel 1, and the collimation notch corresponding to a collimation convex part may be provided in the decoration member 2. FIG. By combining the collimation convex portion of the lens barrel 1 and the collimation notch of the decorative member 2 into a fitted state, the decorative member 2 can be easily assembled to the lens barrel 1 in a predetermined positional relationship. .

  The adhesive reservoir 3 has a rectangular shape as shown in FIG. 2A. In this embodiment, the size of the adhesive reservoir 3 is assumed to be, for example, y = 5.2 mm on one side and x = 2 mm on the other side. Yes. Then, as the arrangement of the adhesive reservoir 3, in order to prevent the instantaneous adhesive 5 from sticking out to the external part of the lens barrel 1, from the joint (step part) between the lens barrel 1 and the decorative member 2 exposed in the external part. , A position with an interval a = 2 mm is assumed.

  If the instantaneous adhesive 5 (for example, cyanoacrylate adhesive) is too thick, curing is insufficient, and if it is too thin, sufficient adhesive force cannot be obtained. Therefore, it is necessary to provide a gap between the lens barrel 1 and the decorative member 2 in the adhesive reservoir 5 so as to be maintained at an interval at which the instantaneous adhesive 5 is properly cured. When the gap between the adhesive members is 0.1 mm or more, the general instantaneous adhesive 5 may not be completely cured and an uncured part may remain. If an uncured portion exists, gas is generated from the uncured portion, and a whitening phenomenon occurs around the bonded portion. Therefore, in order to prevent the uncured adhesive 5 from being uncured, a gap between the lens barrel 1 and the decorative member 2 in the adhesive reservoir 3 is here, as shown in FIG. An appropriately generated interval d = 0.05 mm.

  In FIG. 3, the formation part of the adhesive reservoir 3 in other embodiment is expanded and shown. 3A is a plan view showing a portion where the adhesive reservoir 3 is formed, and FIG. 3B is a cross-sectional view taken along the line P-P ′ of FIG. The difference from the embodiment shown in FIG. 1 and FIG. 2 is that a groove 4 is provided around the adhesive reservoir 3 to accelerate the hardening of the instantaneous adhesive 5 before fitting the decorative member 2 to the lens barrel 1. The curing accelerator 6 is applied to the groove 4.

  In this embodiment, as the size of the groove 4 provided around the adhesive reservoir 3, for example, the width b = 0.5 mm (FIG. 3A) and the depth d1 = 0.1 mm (FIG. 3 ( B)) is assumed. By applying the curing accelerator 6 to the groove 4, it is possible to prevent the instantaneous adhesive 5 from sticking out and further accelerate the curing of the uncured portion of the instantaneous adhesive 5 to suppress the whitening phenomenon. Become. Since the front end side of the lens barrel 1 is the side on which the decorative member 2 is fitted (that is, the side opposite to the side where the instantaneous adhesive 5 spreads when fitted), as shown in FIG. Even if the groove 4 and the curing accelerator 6 are omitted on the front end side, the adhesive reservoir 3 can be kept sealed by the decorative member 2, and the whitening phenomenon can be more effectively prevented.

  Next, an evaluation result of the lens unit 10 obtained by fixing the decorative member 2 to the lens barrel 1 by the assembly method described above will be described. A lens barrel 1 in which three adhesive reservoirs 3 were provided at equal intervals on the circumference was produced, and about 1 ml of instantaneous adhesive 5 was applied to each adhesive reservoir 3 by a fixed amount application machine. Next, the decorative member 2 was attached to the lens barrel 1 so that the collimation portions (collimation convex portions and collimation notches) coincided with each other. And it hold | maintained for 1 second so that the decoration member 2 might not float. For five types of samples having different gaps d between the lens barrel 1 and the decorative member 2, the whitening phenomenon and the like were verified.

  Experiments were performed for each of the above five types of samples. The bonding condition and the amount of the instantaneous adhesive 5 are fixed, and the whitening state and the bonding strength after being allowed to stand for 24 hours after the bonding and the confirmation of the bonding strength (determined by whether or not they are detached when pulled with a predetermined force) are confirmed. went. The verification results are shown in Table 1.

  Of the 5 units, all were OK, 1 was NG, 2 and more were NG. When the gap d = 0.15 mm, whitening occurred. When d = 0.2 mm, there was a portion where the adhesive was not completely cured in 24 hours. In the case of d = 0.025 mm, there was no protrusion of the instantaneous adhesive 5 to the appearance portion, but there was one in which the instantaneous adhesive 5 wraps around a place other than the adhesive reservoir 3. When d = 0.05 mm and d = 0.1 mm, there was no problem in both whitening and strength. From the above results, it can be said that the distance d of the gap between the lens barrel 1 and the decorative member 2 in the adhesive reservoir 3 is preferably 0.05 mm to 0.1 mm.

  As in the above-described embodiments, the gap between the lens barrel 1 and the decorative member 2 in the adhesive reservoir 3 is provided so as to be maintained at an interval d at which the instantaneous adhesive 5 is properly cured. The uncured portion of the instantaneous adhesive 5 can be prevented from occurring, and the whitening phenomenon caused by the insufficient curing of the instantaneous adhesive 5 can be prevented. Therefore, the whitening phenomenon of the instantaneous adhesive 5 can be suppressed without requiring a complicated process, and a lens unit in which the whitening phenomenon of the instantaneous adhesive 5 hardly occurs can be realized. For example, it is possible to prevent the appearance of the decorative member 2 fixed to the tip of the lens barrel 1 from being deteriorated due to the whitening phenomenon. In addition, the adhesive reservoir 3 can clearly show the application position of the instantaneous adhesive 5 to the operator, and the use of the instantaneous adhesive 5 shortens the curing time, thereby greatly reducing the process time. Is possible.

  As described above, by setting the gap d between the lens barrel 1 and the decorative member 2 in the adhesive reservoir 3 to be 0.05 mm to 0.1 mm, the bonding strength, curability and workability can be improved. it can. By providing a groove 4 around the adhesive reservoir 3 and applying a curing accelerator 6 that accelerates the curing of the instantaneous adhesive 5 to the groove 4 before fitting the decorative member 2 to the lens barrel 1, the instantaneous adhesion is achieved. The protrusion of the agent 5 can be prevented and the curing of the instant adhesive 5 in the uncured portion can be further promoted.

  By providing a plurality of adhesive reservoirs 3 on at least one of the outer periphery of the lens barrel 1 and the inner periphery of the decorative member 2, the lens barrel 1 and the decorative member 2 can be fixed stably and firmly. . Furthermore, since the formation of the adhesive reservoir 3 is performed not on the entire circumference but on a part of the circumference, it becomes easy to process the gap of the adhesive reservoir 3 to a predetermined interval d (in addition, the entire circumference) It is difficult to manufacture the gaps with the uniform distance d). At that time, by providing 2 to 4 adhesive reservoirs 3, it is possible to simplify the bonding process and to reduce the cost of the auxiliary material. Further, by providing the adhesive reservoir 3 at equal positions on the circumference, it is possible to reduce distortion of the lens barrel 1 and the decorative member 2 during bonding.

1 Lens barrel 2 Decoration member (appearance member)
3 Adhesive pool 4 Groove 5 Instant adhesive 6 Curing accelerator 9 Lens 10 Lens unit AX Optical axis

Claims (8)

At least one of a lens barrel having a lens inside and an appearance member fitted to the lens barrel is provided with an adhesive reservoir made of a recess, and after applying an instantaneous adhesive to the adhesive reservoir, the mirror A lens unit assembling method for fitting and adhering the outer appearance member to a tube,
A method of assembling a lens unit, characterized in that a gap between the lens barrel and the external appearance member in the adhesive reservoir is provided so as to be maintained at an interval at which the instantaneous adhesive is appropriately cured.   The lens unit assembling method according to claim 1, wherein the appearance member is a decorative member fixed to a tip of the lens barrel.   The lens unit assembling method according to claim 1, wherein an interval between the gaps is 0.05 mm to 0.1 mm.   The lens unit assembling method according to any one of claims 1 to 3, wherein a plurality of the adhesive reservoirs are provided on at least one of an outer periphery of the lens barrel and an inner periphery of the appearance member.   5. The method of assembling a lens unit according to claim 4, wherein two to four adhesive reservoirs are provided.   6. The method of assembling a lens unit according to claim 4, wherein the adhesive reservoir is provided at equal positions on the circumference.   A groove is provided around the adhesive reservoir, and a hardening accelerator for promoting hardening of the instantaneous adhesive is applied to the groove before fitting the appearance member to the lens barrel. The assembly method of the lens unit of any one of 1-6. A lens unit having a lens barrel having a lens inside, and an appearance member fixed by an instantaneous adhesive in a state of being fitted to the lens barrel,
At least one of the lens barrel and the outer appearance member is provided with an adhesive reservoir consisting of a concave portion to which an instantaneous adhesive is applied, and a gap between the lens barrel and the outer appearance member in the adhesive reservoir, The lens unit is provided so as to be maintained at an interval at which the instantaneous adhesive is appropriately cured.

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