JPH1090438A - Cover glass for watch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the mass-productivity of a cover glass for watch, and at the same time, to reduce the cost of the glass by reducing the number of parts and to maintain the appearance quality of the glass for a long period. SOLUTION: Since a cover glass 10 for watch is composed of an integrally formed glass section 12 and a bezel section 14, the numbers of parts and assembling processes of the glass 10 are reduced. In addition, since a printed layer 16 is formed on the rear surface 14b of the bezel section 14, the layer 16 can be enclosed between the bezel section 14 and a barrel 24. Moreover, since a constricted groove 18 is provided between the sections 12 and 14, the sections 12 and 14 can be seen as if they are separate bodies.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover glass attached to the front of a time display section of a timepiece, and more particularly to an integrated cover glass and bezel.

[0002]

2. Description of the Related Art Heretofore, a cover glass and a bezel have been formed separately, and have a structure as shown in FIGS. That is, the cover glass 4 is attached on the inner step 2 a provided at the upper end of the body 2 to cover the time display section, and the bezel 6 is attached to the outer step 2 b provided at the upper end of the body 2. The cover glass 4 is made of a transparent resin or inorganic glass, while the bezel 6 is made of a resin or metal, and numbers, marks, etc. are formed on the upper surface thereof, forming part of the design of the watch. Was.

Various methods of fixing the cover glass 4 and the body 2 and the bezel 6 and the body 2 according to the conventional materials are employed. For example, when the cover glass 4, the body 2 and the bezel 6 are all made of plastic,
As shown in FIG. 4, they are generally welded by ultrasonic waves. Further, when the cover glass 4 is made of inorganic glass, it has been bonded or press-fitted with a packing 8 interposed as shown in FIG. Further, when the bezel 6 and the body 2 are made of metal, bonding or brazing has been performed. However, in any case, since the cover glass 4 and the bezel 6 are separate bodies, it was necessary to fix the cover glass 4 and the body 2 and the bezel 6 and the body 2 respectively.

[0004]

In the case of using the above-mentioned conventional cover glass 4 and bezel 6, since these are formed separately, it is difficult to improve the mass productivity and reduce the cost of parts and assembly. Was difficult.

The numbers and marks formed on the upper surface of the bezel 6 by engraving or the like are colored and decorated by printing, plating, or the like, and then a protective film is formed thereon by clear coating. The use of the period may cause peeling of printing or plating, and may degrade the appearance quality.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to reduce the number of parts, improve mass productivity, reduce costs, and maintain excellent appearance quality over a long period of time. It is to provide a cover glass.

[0007]

SUMMARY OF THE INVENTION A timepiece cover glass according to the present invention includes a cover glass having a glass portion for covering a time display portion and a bezel portion integrally formed around the glass portion, and the bezel portion. And a print layer formed on the back surface of the cover glass, and further provided with a constricted groove in a boundary area between the glass part and the bezel part on the upper surface of the cover glass.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A watch cover glass according to the present invention comprises:
It comprises a cover glass having a glass portion and a bezel portion, and a printing layer formed on the back surface of the bezel portion. Since the cover glass is formed of a glass part and a bezel part integrally formed, the glass part and the bezel part can be attached to the body only by a step of fixing the cover glass to the body. In addition, since a printing layer is formed on the back surface of the bezel part, when the cover glass is fixed to the body, this printing layer can be confined between the bezel part and the body,
The appearance quality can be prevented from deteriorating due to long-term use. Further, the constricted groove provided between the glass portion and the bezel portion allows the glass portion and the bezel portion to visually appear as if they are separate bodies.

[0009]

1 is a sectional view showing a watch cover glass according to an embodiment of the present invention, and FIG. 2 is a plan view thereof.
Reference numeral 10 in the figure denotes a cover glass made of an acrylic transparent resin. At the center of the cover glass 10, a glass part 1 is provided.
2 and a bezel portion 14 is provided integrally therewith.

The glass portion 12 swells to the front side,
It is formed so as to correspond to the shape of the time display unit of the timepiece and to cover the front surface thereof. The front surface 14a of the bezel portion 14 is an inclined surface, and the rear surface 14b is a horizontal surface.

Reference numeral 16 denotes a printing layer formed by printing on the back surface 14b of the bezel portion 14. The printing layer 16 is formed by using a single color or a plurality of colors, numbers, marks, patterns, or a combination or a combination thereof.

Reference numeral 18 denotes a constricted groove which is formed in an annular shape in a boundary region between the glass portion 12 and the bezel portion 14 on the upper surface of the cover glass 10 and has a U-shaped cross section. This constriction groove 18
It is provided to make the glass part 12 and the bezel part 14 visually distinct from each other when viewed from obliquely upward like a time display part when using a watch, and to make it appear as if they are separate bodies. I have.

Reference numeral 20 denotes an annular protrusion for positioning and fixing projecting from the back surface of the cover glass 10, and reference numeral 22 denotes an annular recess provided outside the protrusion 20.

The timepiece cover glass having the above structure is attached to the body 24 as follows. As described above, there are various fixing methods depending on the materials of the cover glass 10 and the body 24. In this embodiment, the cover glass 10 made of resin is used.
Shows an example of a fixing method of attaching to a plastic body 24. That is, the protruding portion 20 of the cover glass 10 is brought into contact with the inner step portion 24 a provided at the upper end of the body 24. At this time, the upper protruding portion 24b at the upper end of the body 24 fits into the concave portion 22 of the cover glass 10, and the bezel portion 14
Is positioned so that the back surface 14b of the upper surface 14b faces the outer step portion 24c at the upper end of the body 24. In this state, the surface in contact with the inner step portion 24a of the body 24 and the projecting portion 20 is joined by ultrasonic welding.

By fixing the cover glass 10 to the body 24 as described above, the printed layer 16 formed on the back surface 14b of the bezel part 14 is positioned between the bezel part 14 and the outer step 24c of the body 24. As a result, it is possible to prevent an object or a fingertip from touching the printed layer 16 during use of the timepiece, thereby preventing peeling or damage.

[0016]

According to the present invention, by integrating the cover glass and the bezel, which have conventionally been made up of separate parts, the number of parts can be reduced and the mounting process can be reduced, and mass productivity can be reduced. Can be improved and costs can be reduced.

Further, since the printed layer for forming numbers, marks and the like is formed on the back surface of the bezel portion, damage or peeling due to contact with a finger or the like can be prevented.

Further, since numbers, marks, etc. are formed by printing, it is easy to change them, and a plurality of colors can be used, various colors can be produced, or complicated patterns and shades can be produced. The number of variations can be greatly increased without changing the manufacturing process.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a timepiece cover glass according to an embodiment of the present invention.

FIG. 2 is a plan view of the watch cover glass shown in FIG.

FIG. 3 is a sectional view showing a conventional cover glass and bezel.

FIG. 4 is a cross-sectional view showing a conventional cover glass and bezel.

[Explanation of symbols]

 2 Body 4 Cover glass 6 Bezel 8 Packing 10 Cover glass 12 Glass part 14 Bezel part 14a Surface 14b Back surface 16 Print layer 18 Constriction groove 20 Projection 22 Depression 24 Body 24a Inner step 24b Upper protrusion 24c Outside step

Claims (2)

[Claims] 1. A cover glass comprising: a glass part covering a time display part; a bezel part integrally formed around the glass part; and a print layer formed on the back surface of the bezel part. A watch cover glass characterized by the following. 2. The timepiece cover glass according to claim 1, wherein a constriction groove is provided in a boundary region between the glass portion and the bezel portion on the upper surface of the cover glass.