JPH0511071A - Equipment casing with indication plate - Google Patents

Abstract

PURPOSE:To improve the appearance of a casing without any flash produced during soldering being seen from an indication plate by forming a recessed part for collecting fused members in a periphery of fixed part of the casing itself having a fixed part to which an end part of a transparent indication plate is fused and fixed. CONSTITUTION:At an upper inner side of main body 1 of a casing, a fixed part 3 slanting downward and toward the inner side is formed, and its lower part is extended further innerward to form a fused member collecting recessed part 5 by erecting its end part upwardly. This erected part becomes a protruding part 6 closing the intruding part 5 to which a folded peripheral part 4 of an indication plate 2 is inserted. And then, by welding the peripheral part 4 to the fixed part 3, molten flash of embers is collected in the recessed part 5. In this way, no flash comes into the casing 1 and is viewed from the outside, and also the appearance of the casing is much improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device case having a transparent display plate such as a watch case of a wristwatch.

[0002]

2. Description of the Related Art In a wristwatch or the like, a display plate such as a watch glass is fixed by welding or the like to the upper part of a device case which is a watch case. 3 and 4 show a conventional structure of this device case, which includes a case body 31 made of plastic or the like and a transparent display plate 32 such as acrylic glass fixed to the upper portion of the case body 31. In the case of a wristwatch or the like, the display plate 32 constitutes a watch glass, and a timepiece module (not shown) having a dial is attached inside the case main body 31 located below the display plate 32, and It is possible to read the time silently. Since it is necessary to prevent the display plate 32 from falling off or make the inside of the device case watertight, the display plate 32 and the case body 31 are firmly fixed to each other. Therefore, a fixing portion 34 with which the outer peripheral portion 33 of the display plate 32 abuts is formed on the inner peripheral surface side of the case main body 31, and the outer peripheral portion 33 of the display plate 32 abuts on the fixing portion 34. Ultrasonic welding is performed on a contact portion between the case body 31 and the case body 31 (see FIG. 4).

[0003]

In the above structure, it is necessary to increase the adhesion strength between the display plate 32 and the case body 31 in order to make the inside of the equipment case a high-pressure waterproof structure, for example. For this purpose, it is necessary to sufficiently perform melting and bonding by ultrasonic waves, and it is inevitable that the display plate 32 and the case body 31 are inevitably joined.
The amount of melting of is increased. However, due to the increase in the melting amount, the melting residue protrudes from the joint between the display plate 32 and the case body 31, and as shown in FIG.
Adheres to the inside of the device case. Then, since such a protrusion of the burr 35 is seen through from the display plate 32, the appearance is deteriorated and the commercial value of the device case is reduced. In addition, there is a drawback that if the burr 35 is removed and enters the inside of the equipment case, it may cause a failure or the like.

The present invention has been made in consideration of the above circumstances, and provides a device case equipped with a display plate which can improve the appearance without burrs generated during welding being visible on the display plate. The purpose is to do.

[0005]

DISCLOSURE OF THE INVENTION The present invention has a structure in which burrs generated at the time of welding are released, and a case body having a transparent display plate and a fixing portion to which an end portion of the display plate is melted and fixed. And a recess for escaping the melted member is formed in the vicinity of the fixed portion of the case body.

[0006]

1 and 2 show an embodiment in which the present invention is applied to a watch case of a wristwatch, which comprises a case body 1 and a display plate 2 attached to the upper part of the case body 1. The case body 1 has a timepiece module (not shown) housed therein, and is made of plastic or other ultrasonically fusible material. The case body 1 has a fixing portion 3 which is inclined downward toward the inside and is formed on the inner surface of the upper portion. On the other hand, the display plate 2 is transparent, has a tapered surface 2a on the outer peripheral surface, and is ultrasonically meltable,
For example, it is formed of acrylic glass or the like, and its outer peripheral portion is bent downward, and the bent peripheral edge portion 4 is attached to the case main body 1 so as to contact the fixed portion 3 of the case main body 1. Then, in this contact state, the display plate 2 is fixed by ultrasonic welding.

In addition to the above structure, the case body 1 is provided with a recess 5 for escape. The escape concave portion 5 is formed in a portion surrounded by the lower portion of the fixing portion 3 by extending the case main body 1 portion further inward and raising the extended end portion upward. . Further, in the illustrated example, the bent peripheral edge portion 4 of the display plate 2 is inserted into the rising portion of the escape recess 5 to form a protrusion 6 that closes the escape recess. The protruding portion 6 is formed so as to be higher than the fixing portion 3 to which the display plate 2 is abutted and ultrasonically bonded.

In the above structure, the display plate 2 is attached to the upper portion of the case body 1 so that the peripheral edge portion 4 thereof contacts the fixing portion 3 of the case body 1 as shown in FIG. Then, the peripheral edge portion 4 and the fixed portion 3 which are in contact with each other are ultrasonically vibrated,
By welding these, the display plate 2 is fixed. The burr (melting part) 7 of each member melted by ultrasonic waves at the time of ultrasonic welding is housed in the escape recess 5 as shown in FIG. 1, so that the burr 7 does not come off and enter the inside of the watch case. Also, the burr 7 is hidden and the display board 2 is covered.
Never seen through. Therefore, the appearance of the device case can be improved and the commercial value thereof can be increased. Therefore, even if the ultrasonic welding amount is increased for high-pressure waterproofing or the like, no problem occurs. Further, in this embodiment, the escape recess 5
Since the inner protruding portion 6 is higher than the fixed portion 3, the burr 7 can be hidden more reliably.

The present invention is not limited to the above embodiment, but various modifications can be made. For example, the shape of the escape recess may be any shape as long as it can accommodate the burr,
Further, the protrusions 6 may have the same height or lower than the fixed portions 3. Furthermore, the present invention can be similarly applied to a device case other than a wrist watch, for example, a communication clock such as a table clock, a computer, and a pager.

[0010]

According to the present invention, the appearance of the equipment case can be improved because the escape recess for covering the molten portion of the member generated during ultrasonic welding is provided.

[Brief description of drawings]

FIG. 1 is a cross-sectional view after welding of an embodiment of the present invention.

FIG. 2 is a sectional view of one embodiment of the present invention before welding.

FIG. 3 is a cross-sectional view of a conventional technique before welding.

FIG. 4 is a cross-sectional view after welding according to the related art.

[Explanation of symbols]

1 case body 2 display board 3 fixed plate 5 Recessed recess 6 protrusion

Claims (2)

[Claims] 1. A transparent display plate and a case body having a fixing portion to which an end portion of the display plate is melted and fixed, and a recess for escaping the melted member is formed in the vicinity of the fixing portion of the case body. A device case equipped with a display board that is characterized in that 2. The equipment case provided with a display plate according to claim 1, wherein a protrusion that is higher than the fixed portion is formed in the escape recess.