JP2733614B2 - Adhesive fixing method of watch cover glass - Google Patents
Adhesive fixing method of watch cover glassInfo
- Publication number
- JP2733614B2 JP2733614B2 JP3159789A JP3159789A JP2733614B2 JP 2733614 B2 JP2733614 B2 JP 2733614B2 JP 3159789 A JP3159789 A JP 3159789A JP 3159789 A JP3159789 A JP 3159789A JP 2733614 B2 JP2733614 B2 JP 2733614B2
- Authority
- JP
- Japan
- Prior art keywords
- cover glass
- adhesive
- watch case
- glass
- case
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Joining Of Glass To Other Materials (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、腕時計用カバーガラスの接着固定方法に関
する。The present invention relates to a method for bonding and fixing a cover glass for a wristwatch.
本発明は、紫外線硬化型接着剤を用いて、材質が無機
ガラスまたはサファイヤであるカバーガラスを接着する
腕時計ケースまたは縁において、接着剤を塗布し、カバ
ーガラスをセットした腕時計ケースまたは縁を加熱し直
ちに紫外線を照射して接着剤を硬化させることにより腕
時計ケースとカバーガラスの熱膨張係数の違いにより、
常温に戻した状態で接着部に圧縮応力を与えて接着固定
したものである。The present invention uses an ultraviolet-curable adhesive to apply an adhesive to a watch case or an edge to which a cover glass made of inorganic glass or sapphire is bonded, and heat the watch case or the edge on which the cover glass is set. Immediately by irradiating ultraviolet light to cure the adhesive, the difference in the coefficient of thermal expansion between the watch case and the cover glass,
In the state where the temperature is returned to normal temperature, a compressive stress is applied to the bonding portion and the bonding portion is bonded and fixed.
従来、腕時計用カバーガラスを腕時計ケースまたは縁
に接着剤を用いて接着固定する構造は多く提案され実施
されている。接着剤により固定する構造の利点は、腕時
計用カバーガラスの取付け固定が容易で部品点数が少な
く、仕上がり外観も良好であることである。2. Description of the Related Art Hitherto, many structures for bonding and fixing a watch cover glass to a watch case or an edge using an adhesive have been proposed and implemented. The advantages of the structure of fixing with an adhesive are that the cover glass for a wristwatch is easily attached and fixed, the number of parts is small, and the finished appearance is good.
接着剤としては従来はエポキシ系の熱硬化型接着剤が
多く用いられていたが、近年はアクリル系等の紫外線硬
化型接着剤も多用されるようになった。紫外線硬化型接
着剤は１液タイプであるため２液混合の手間がかから
ず、ポットライフが長く、短時間の紫外線照射で硬化す
ることができるため、作業性が良好である利点がある。Conventionally, an epoxy-based thermosetting adhesive has been widely used as an adhesive, but in recent years, an ultraviolet curable adhesive such as an acrylic-based adhesive has also been frequently used. Since the UV-curable adhesive is a one-part type, it does not require two-component mixing, has a long pot life, and can be cured by short-time UV irradiation, and thus has the advantage of good workability.
しかし、紫外線硬化型の接着剤は、エポキシ系の熱硬
化型接着剤と比較すると接着強度が弱くガラス剥離等の
問題が起こることがあった。However, UV-curable adhesives have lower adhesive strength than epoxy-based thermosetting adhesives, and may cause problems such as glass peeling.
その原因として、カバーガラス接着剤にかかる応力の
問題がある。熱硬化型接着剤により接着した場合はカバ
ーガラスより腕時計ケースの方が熱膨張係数が大きく加
熱状態では腕時計ケースのほうが伸びが大きい。接着剤
が硬化した後常温に戻すと、カバーガラスより腕時計ケ
ースの方が収縮が大きいので腕時計ケースによりカバー
ガラスが締められ、接着部に圧縮応力がかかる。そのた
めパッキンを介してガラスを圧入した場合のような応力
状態となる。そのため、ガラス外し力は大きくなる。As a cause thereof, there is a problem of stress applied to the cover glass adhesive. When bonded with a thermosetting adhesive, the watch case has a larger coefficient of thermal expansion than the cover glass, and the watch case has a larger elongation in the heated state. When the temperature is returned to normal temperature after the adhesive is cured, the watch case shrinks more than the cover glass, so that the cover glass is tightened by the watch case, and compressive stress is applied to the bonding portion. For this reason, a stress state occurs as when glass is press-fitted through packing. Therefore, the glass removing force is increased.
カバーガラス（材質：無機ガラス）の熱膨張係数を8.
8×10-6/℃、腕時計ケース（材質：ステンレス）の熱膨
張係数を21×10-6/℃とし、外径30mmのカバーガラスを
接着するとすると80℃と常温23℃とでは約30μｍの相対
的ずれを生じることになる しかし、紫外線硬化型接着剤により接着した場合は、
接着時に加熱される温度が低いため、接着部にかかる圧
縮応力が小さい。Set the thermal expansion coefficient of the cover glass (material: inorganic glass) to 8.
8 × 10 -6 / ° C, the coefficient of thermal expansion of a watch case (material: stainless steel) is 21 × 10 -6 / ° C, and when a cover glass with an outer diameter of 30 mm is bonded, it will be about 30 μm at 80 ° C and normal temperature 23 ° C. However, it will cause a relative displacement.
Since the temperature heated during bonding is low, the compressive stress applied to the bonded portion is small.
さらに、カバーガラス付きの腕時計ケースに裏蓋を装
着した場合について考えると、裏蓋を装着すると腕時計
ケースは裏蓋の食い付き凸部により内側から押し広げら
れる。そのため、接着部に圧縮応力がかかっていればそ
の圧縮応力が減少する。しかし、紫外線硬化型接着剤に
より接着し接着部にかかる圧縮応力が小さい場合は、裏
蓋を装着することにより接着部にかかる圧縮応力がほと
んどなくなり、特に裏蓋装着による変形が大きい場合は
接着部にかかる圧縮応力がなくなり逆に引っ張り応力が
発生する。そのため接着剥離等の問題を起こすことがあ
った。Furthermore, considering the case where the back cover is attached to the watch case with the cover glass, when the back cover is attached, the watch case is pushed out from the inside by the biting convex portion of the back cover. Therefore, if a compressive stress is applied to the bonding portion, the compressive stress decreases. However, when the compressive stress applied to the bonded portion is small due to bonding with the ultraviolet curing adhesive, the compressive stress applied to the bonded portion is almost eliminated by mounting the back cover. , The compressive stress applied thereto disappears, and on the contrary, tensile stress is generated. For this reason, problems such as adhesion peeling may occur.
本発明は、紫外線硬化型接着剤を用いカバーガラスを
接着する場合にエポキシ系の熱硬化型接着剤で接着した
場合と同様に圧縮応力を発生させ同程度の接着力を得
て、また裏蓋を装着し腕時計ケースが変形した状態でも
接着部に圧縮応力が残るようにするものである。In the present invention, when bonding a cover glass using an ultraviolet-curing adhesive, a compressive stress is generated in the same manner as when bonding with an epoxy-based thermosetting adhesive to obtain the same adhesive strength, and a back cover is obtained. Is attached so that a compressive stress remains in the bonded portion even when the watch case is deformed.
本発明は、紫外線硬化型接着剤を用い、腕時計用カバ
ーガラスを接着する際、接着剤を塗布しカバーガラスを
セット後、腕時計ケースを加熱した状態で紫外線を照射
して接着剤を硬化させることにより、熱硬化型接着剤で
接着した場合と同様に常温に戻した状態でガラス接着部
に圧縮応力を付与しようとするものである。The present invention uses an ultraviolet-curable adhesive, when bonding a cover glass for a watch, after applying the adhesive and setting the cover glass, curing the adhesive by irradiating ultraviolet light with the watch case heated. Thus, it is intended to apply a compressive stress to the glass-bonded portion in a state where the temperature is returned to normal temperature in the same manner as in the case of bonding with a thermosetting adhesive.
ただし、本発明方法が使えるのは、腕時計ケースの熱
膨張係数よりカバーガラスの熱膨張係数が小さい場合で
ある。従って、材質が金属である腕時計ケースでは、カ
バーガラスの材質が、無機ガラスまたはサファイヤであ
る場合に本発明方法を適用できるが、アクリル樹脂の場
合は本発明方法は適用できない。However, the method of the present invention can be used when the thermal expansion coefficient of the cover glass is smaller than the thermal expansion coefficient of the watch case. Therefore, in a wristwatch case made of metal, the method of the present invention can be applied when the material of the cover glass is inorganic glass or sapphire, but the method of the present invention cannot be applied when the material is acrylic resin.
以上の工程により、容易にガラス接着部に圧縮応力を
付与しガラス外し力を向上させることができる。Through the above steps, it is possible to easily apply a compressive stress to the glass bonded portion and improve the glass removing force.
以下実施例により本発明を詳細に説明する。 Hereinafter, the present invention will be described in detail with reference to examples.
第１図は、本発明方法によりカバーガラスを接着しカ
バーガラスが締め付けられ中心部が凸状に湾曲した状態
を示す腕時計ケースの断面図である。第２図（Ａ）〜
（Ｃ）は、本発明の各工程でのカバーガラスの腕時計ケ
ースの相対的ずれを示す断面図である。FIG. 1 is a cross-sectional view of a watch case showing a state in which a cover glass is adhered by the method of the present invention, the cover glass is tightened, and a center portion is curved in a convex shape. Fig. 2 (A)-
(C) is sectional drawing which shows the relative displacement of the wristwatch case of the cover glass in each process of this invention.
（Ａ）アクリル系等の紫外線硬化型接着剤を注射器にい
れ、ステンレス製腕時計ケース３のガラス接着部に塗布
し、カバーガラス１を装着する。(A) Acrylic UV-curable adhesive is put into a syringe, applied to the glass bonding portion of the stainless steel watch case 3, and the cover glass 1 is attached.
（Ｂ）ついで赤外線を照射して腕時計ケース３を80℃に
加熱した。カバーガラス１より腕時計ケース３の方が熱
膨張係数が大きいため膨張が大きく接着槽の厚さt2は
（Ａ）の状態t1より広がる。直ちに高圧水銀灯で50cmの
距離から紫外線を１分間照射して接着剤を硬化させ接着
層２を形成した。(B) Then, the watch case 3 was heated to 80 ° C. by irradiating infrared rays. The thickness t 2 of the expansion is large adhesive tank for it is a large thermal expansion coefficient of the wristwatch case 3 from the cover glass 1 is spread from state t 1 of (A). Immediately, ultraviolet light was irradiated from a distance of 50 cm with a high-pressure mercury lamp for 1 minute to cure the adhesive and form an adhesive layer 2.
（Ｃ）常温に戻した。カバーガラス１より腕時計ケース
３の方が収縮が大きくt1よりt2の方が大きいため、腕時
計ケース３によりカバーガラス１が締められ、t3はt2よ
り少し小さくなる。カバーガラス１の中心部が凸状にた
わんでいる。(C) The temperature was returned to normal temperature. For people of the wristwatch case 3 from the cover glass 1 is larger t 2 than shrinkage is large t 1, the cover glass 1 is clamped by the wristwatch case 3, t 3 is slightly smaller than t 2. The center of the cover glass 1 is bent in a convex shape.
第３図（Ａ）〜（Ｃ）は、本発明方法（加熱あり）と
従来方法（加熱無し）で接着固定されたカバーガラス表
面の平坦度をオプチカルフラットを用いて測定した場合
を示すものである。（Ａ）のようにカバーガラスの上に
オプチカルフラットをのせ上から観察すると（Ｂ）本発
明方法の場合はニュートンリングが細かい間隔で見えカ
バーガラスが上方に湾曲していることがわかるが、
（Ｃ）従来方法の場合は、観察されるニュートンリング
の間隔が（Ｂ）より広く、湾曲が少ないことがわかる。FIGS. 3A to 3C show the case where the flatness of the surface of the cover glass adhered and fixed by the method of the present invention (with heating) and the conventional method (without heating) is measured using an optical flat. is there. When the optical flat is placed on the cover glass as in (A) and observed from above (B), in the case of the method of the present invention, it can be seen that the Newton rings are seen at small intervals and the cover glass is curved upward.
(C) In the case of the conventional method, it can be seen that the distance between the observed Newton rings is wider than in (B) and the curvature is small.
第４図（Ａ）〜（Ｃ）は、裏蓋を装着した状態で本発
明方法（加熱あり）と従来方法（加熱無し）で接着固定
されたカバーガラス表面の平坦度をオプチカルフラット
を用いて測定した場合を示すものである。（Ｂ）本発明
方法の場合は楕円形のニュートンリングが観察され、食
い付け凸部のある方向に腕時計ケースが引き伸ばされ変
形しているが、カバーガラスの上方への湾曲は残り、接
着部の応力が残っていることがわかる。（Ｃ）従来方法
の場合は、図に示すような縞が観察され、カバーガラス
の上方への湾曲が無くなり逆に下方への湾曲が生じ、接
着部に引っ張り応力がかかっていることがわかる。4 (A) to 4 (C) show the flatness of the surface of the cover glass adhered and fixed by the method of the present invention (with heating) and the conventional method (without heating) with the back cover attached, using an optical flat. This shows the case where measurement was performed. (B) In the case of the method of the present invention, an elliptic Newton ring is observed, and the watch case is stretched and deformed in the direction of the biting convex portion, but the upward curvature of the cover glass remains, and It can be seen that stress remains. (C) In the case of the conventional method, stripes as shown in the figure are observed, and it can be seen that the upward curving of the cover glass is lost and conversely, the downward curving occurs, and a tensile stress is applied to the bonding portion.
本発明方法によれば、腕時計ケースが裏蓋装着により
引き伸ばされ変形しても接着部の圧縮応力は残るため、
接着剥離は起こりにくい。According to the method of the present invention, the compressive stress of the bonded portion remains even if the watch case is stretched and deformed by attaching the back cover,
Adhesive peeling is unlikely to occur.
このようにして接着したカバーガラスの接着強度を従
来の加熱しないで紫外線を照射して硬化させたものと比
較した結果を表１に示す。Table 1 shows the result of comparing the adhesive strength of the cover glass thus bonded with that of the conventional cover glass cured by irradiating ultraviolet rays without heating.
本発明方法の著しい接着力向上効果が認められた。 A remarkable effect of improving the adhesive strength of the method of the present invention was recognized.
腕時計ケースを加熱する方法は本実施例に述べた赤外
線を照射する方法以外に、恒温槽で加熱する方法、熱風
を吹き付ける方法、高周波誘導加熱による方法等があ
る。In addition to the method of irradiating infrared rays described in this embodiment, a method of heating a watch case includes a method of heating in a thermostat, a method of blowing hot air, and a method of high-frequency induction heating.
また、加熱温度については80℃の場合について説明し
たが、60℃から100℃の範囲内で有効であることを確認
した。In addition, the heating temperature was described in the case of 80 ° C., but it was confirmed that the heating temperature was effective in the range of 60 ° C. to 100 ° C.
以上実施例に述べたように本発明によれば、腕時計用
カバーガラス接着部に圧縮応力を付与し接着力を向上さ
せることができる。裏蓋を装着した状態でも接着部に圧
縮応力がなくならないため、時間経過にともなって発生
する接着剥離、ガラスはずれ等の不良を防止することが
でき、信頼性の高い腕時計外装部品を供給することがで
きる。As described in the above embodiments, according to the present invention, it is possible to apply a compressive stress to the bonded portion of the cover glass for a wristwatch to improve the bonding strength. Even when the back cover is attached, the adhesive part does not lose the compressive stress, so it is possible to prevent defects such as adhesive peeling and glass detachment that occur over time, and supply highly reliable watch exterior parts Can be.
第１図は、本発明方法によりカバーガラスを接着した腕
時計ケースの断面図、第２図（Ａ）〜（Ｃ）は、本発明
の各工程でのカバーガラスと腕時計ケースの相対的ずれ
を示す断面図、第３図（Ａ）〜（Ｃ）は本発明方法と従
来方法とで接着したカバーガラスの平坦度を調べた説明
図、第４図（Ａ）〜（Ｃ）は、裏蓋を装着した状態でカ
バーガラスの平坦度を調べた説明図である。 １……カバーガラス ２……接着層 ３……腕時計ケース ４……オプチカルフラット ５……裏蓋FIG. 1 is a cross-sectional view of a watch case to which a cover glass is adhered by the method of the present invention, and FIGS. 2A to 2C show relative displacement between the cover glass and the watch case in each step of the present invention. 3 (A) to 3 (C) are explanatory diagrams for examining the flatness of the cover glass adhered by the method of the present invention and the conventional method, and FIGS. 4 (A) to 4 (C) are diagrams of the back cover. FIG. 5 is an explanatory diagram illustrating a flatness of a cover glass when the cover glass is mounted. DESCRIPTION OF SYMBOLS 1 ... Cover glass 2 ... Adhesive layer 3 ... Watch case 4 ... Optical flat 5 ... Back cover
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭53−45564（ＪＰ，Ａ) 特開 昭58−9848（ＪＰ，Ａ) 特開 昭51−2465（ＪＰ，Ａ) 特開 平２−36393（ＪＰ，Ａ) 実開 昭53−76868（ＪＰ，Ｕ) 実開 昭48−68572（ＪＰ，Ｕ) ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-53-4564 (JP, A) JP-A-58-9848 (JP, A) JP-A-51-2465 (JP, A) JP-A-2- 36393 (JP, A) Fully open Showa 53-76868 (JP, U) Really open Showa 48-68572 (JP, U)
Claims (1)
外線硬化型接着剤を塗布する工程と、材料が無機ガラス
またはサファイヤであるカバーガラスをセットする工程
と、前記カバーガラスをセットした腕時計ケースまたは
縁を加熱し紫外線を照射して前記接着剤を硬化させる工
程とからなり、常温に戻した状態で前記接着部に圧縮応
力を与えることを特徴とする腕時計用カバーガラスの接
着固定方法。1. A step of applying an ultraviolet-curing adhesive to a watch case or an edge glass bonding portion, a step of setting a cover glass made of inorganic glass or sapphire, and a watch case or a watch case in which the cover glass is set. A step of heating the edge and irradiating ultraviolet rays to cure the adhesive, and applying a compressive stress to the adhesive portion in a state where the temperature is returned to a normal temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3159789A JP2733614B2 (en) | 1989-02-10 | 1989-02-10 | Adhesive fixing method of watch cover glass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3159789A JP2733614B2 (en) | 1989-02-10 | 1989-02-10 | Adhesive fixing method of watch cover glass |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02210293A JPH02210293A (en) | 1990-08-21 |
| JP2733614B2 true JP2733614B2 (en) | 1998-03-30 |
Family
ID=12335606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3159789A Expired - Fee Related JP2733614B2 (en) | 1989-02-10 | 1989-02-10 | Adhesive fixing method of watch cover glass |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2733614B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5195003B2 (en) * | 2008-05-09 | 2013-05-08 | トヨタ自動車株式会社 | Reactor device and reactor device manufacturing method |
-
1989
- 1989-02-10 JP JP3159789A patent/JP2733614B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02210293A (en) | 1990-08-21 |
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