| 摘要 |
The present invention relates to a method of manufacturing a flat sign device from which a gas injection tube is removed, the flat sign device having a structure in which a front plate and a rear plate are sealed while a predetermined gap is formed, and an injection hole is provided at a predetermined location on the front plate or the rear plate, the method including a step of causing a cylindrical injection tube to be located over the injection hole, and sealing a portion of a plate, which comes into contact with the injection tube, using a first sealing member, a step of inserting a second sealing member into the injection tube, exhausting air from the flat sign device using a vacuum, and injecting a discharge gas, a step of melting the second sealing member by heating a plate that is located opposite the second sealing member, thus sealing the injection hole and a portion of the gap that neighbors the injection hole, and a step of removing the injection tube by melting the first sealing member. According to the present invention, the flat sign device of the present invention is formed such that the injection tube is completely removed, that is, such that the protruding sealing part is absent, as in the conventional technology. Accordingly, an effect in which the flat sign device can be very easily carried, stored, or handled can be realized. |
