JPH0517888U - Dustproof touch panel - Google Patents

Abstract

(57) [Summary] [Construction] In the dustproof type touch panel of the present invention, the PC plate 3 and the cover 2 are airtightly coupled via the packing 4, and the partition plate 6 is airtightly partitioned at one corner of the cover 2. Isolation room 5
Is provided, the partition plate 6 of the isolation chamber 5 is provided with a vent hole 8, and the internal volume of the end of the pipe 11 communicating with the isolation chamber 5 and airtightly attached is changed according to the internal pressure. The pressure regulating container 12 communicates with the inside of the pipe 11 and is attached in an airtight manner. [Effect] The volume change of the internal gas due to the ambient temperature change is
Since the internal gas moves through the communication path from the inside of the cover through the isolation chamber to the pressure control container via the pipe, the internal volume of the pressure control container is absorbed by the expansion and contraction of the internal volume. The pressure difference from the atmospheric pressure is not applied, the airtightness inside the touch panel is maintained, the invasion of dust and the like from the outside is prevented, and the deterioration of the touch panel performance due to the dust can be eliminated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a CRT touch panel used for a control device or the like.

[0002]

[Prior Art]

 2A, 2B, and 2C show conventional touch panels. The touch panel 21 is configured by connecting a cover 22 and a PC board 23 with machine screws 26. The cover 22 is formed by using a plastic material having a U-shaped cross section to open the lower surface in a frame shape surrounding the CRT display surface. The PC plate 23 has a shape that closes the open surface of the cover 22. The PC plate 23 extends on the inner surface of the PC plate 23 in the longitudinal direction thereof, stands upright in parallel with the side surface of the cover 22, and the diode holding plate 24 is a small screw. It is fixedly provided at 26.

On two adjacent sides of the cover 22, light emitting diodes 25 are arranged at short intervals on each diode holding plate 24 so as to be directed to the inner side surface of the cover 22 and face the two sides. On the two sides of the cover 22, photodiodes are arranged on the respective diode holding plates 24 so as to be directed to the inner surface of the cover 22 and to be located on the same optical axis as the respective light emitting diodes 25.

In the conventional touch panel 21 configured as described above, since the volume of gas (air) inside the touch panel changes due to the change in ambient temperature, the touch panel cannot be hermetically sealed, and each time the volume changes, the touch panel is externally changed. Dust and the like entered inside the touch panel and adhered to the surface of the light emitting diode and the photodiode and the inner surface of the cover 22 and deteriorated the performance of the touch panel.

[0005]

[Problems to be solved by the device]

 As described above, in the conventional touch panel, since the volume of the internal gas changes due to the change in the ambient temperature, the cover 22 and the PC board 23 need to have a strong structure because the cover 22 and the PC plate 23 have a pressure difference from the atmospheric pressure. Because of this, it was not possible to make it airtight, and as a result, there was the drawback that dust and the like would enter the inside of the touch panel. Therefore, an object of the present invention is to realize a dust-proof type touch panel in which the touch panel is made airtight to prevent dust from entering, and the cover and the PC plate are not subjected to a pressure difference from the atmospheric pressure.

[0006]

[Means for Solving the Problems]

 The dustproof touch panel of the present invention keeps the inside of the cover airtight by packing between the cover and the PC plate that closes the open surface of the cover, and further, at one corner of the cover, the PC plate is attached. An isolation chamber with both ends closed by partition plates that abut against each other via packing to partition the cross section of the cover, fill the isolation chamber with air filter material, and provide ventilation holes in one partition plate. One end of the pipe is attached to the PC plate on the bottom surface of the pipe in an airtight manner, and a pipe that opens to the isolation chamber is installed. The pressure control container is connected to the inside of the pipe so that it is kept airtight.

[0007]

[Action]

 In the dustproof touch panel of the present invention, the volume change of the internal air when the ambient temperature changes is communicated from the inside of the cover through the ventilation hole to the isolation chamber, and through the pipe through the air filter material to the pressure regulating container. It is absorbed by the expansion and contraction of the internal volume of the pressure regulation container due to the movement of the internal gas through the communication passage leading to. As a result, the cover and the PC plate are not subjected to a pressure difference from the atmospheric pressure, the airtightness inside the touch panel is maintained, and dust and the like are prevented from entering from the outside.

[0008]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings.

1A, 1B, and 1C show a dustproof touch panel according to an embodiment of the present invention. 1 (a) is a perspective view showing the overall appearance, FIG. 1 (b) is a sectional view taken along the line AA in FIG. 1 (a), and FIG. 1 (c) is a line BB in FIG. 1 (a). FIG.

The dust-proof type touch panel 1 is configured by connecting a cover 2 and a PC plate 3 via a packing 4 and tightening and fixing them with a machine screw 13. The cover 2 is formed by using a plastic material having a U-shaped cross section so as to surround the CRT display surface and having an open lower surface. One of the corners of the cover 2 abuts the PC board 3 and the packing 4. An isolation chamber 5 whose both ends are closed by partition plates 6 that partition the cross section of the cover 2 is provided. An air filter material 7 is put in the inside of the isolation chamber 5, a ventilation hole 8 is provided in one partition plate 6 of the isolation chamber 5, and the internal space of the dustproof touch panel 1 and the isolation chamber 5 are communicated with each other. ing.

The PC plate 3 has a shape that closes the open surface of the cover 2. On the inner surface of the PC plate 3, the diode holding plate 9 extends in the longitudinal direction and stands upright in parallel with the side surface of the cover 2. It is fixedly installed by machine screws 13 inserted into the screw insertion holes of the plate 3 through the packing 4.

On two adjacent sides of the cover 2, the light emitting diodes 10 are arranged at short intervals on each diode holding plate 9 so as to be directed to the inner side surface of the cover 2, and the covers facing these two sides are arranged. In the two sides of 2, the photodiodes are arranged on each diode holding plate 9 so as to be directed to the inner surface of the cover 2 and to be located on the same optical axis as the light emitting diodes 10.

A pipe 11 which is attached to the PC plate 3 on the bottom surface of the isolation chamber 5 of the cover 2 by one end of which is attached by a method of keeping airtightness such as soldering and opened to the isolation chamber 5 is provided. At the other end outside the touch panel, for example, a comb balloon 12 is attached as a pressure regulating container whose internal volume changes in accordance with the change in internal pressure so as to communicate with the inside of the pipe 11 while keeping airtightness.

In the dustproof touch panel according to the embodiment of the present invention configured as described above, the volume change of the gas inside due to the change of the surrounding temperature is passed from the inside of the cover 2 to the isolation chamber 5 through the ventilation hole 8. The internal volume of the rubber balloon 12 is absorbed by expansion and contraction of the internal volume of the rubber balloon 12 as a result of the internal gas moving through a communication path that passes through the pipe 11 through the air filter material 7 and reaches the rubber balloon 12. As a result, the cover 2 and the PC plate 3 are not subjected to a pressure difference from the atmospheric pressure, the airtightness inside the dustproof touch panel 1 is maintained, and dust and the like are prevented from entering from the outside. Therefore, it is possible to eliminate the deterioration of the touch panel performance due to the dust that has entered the inside. Further, since the cover 2 and the PC plate 3 are not subjected to a pressure difference from the atmospheric pressure, the touch panel can be made airtight without a strong structure, and a dustproof touch panel can be realized at low cost. In addition, even if the rubber balloon 12 is damaged, the air filter material 7 is interposed between the air filter material 7 and the inside of the touch panel, so that dust can be prevented from entering.

As the pressure regulating container of the present invention, a similar effect can be obtained by using, instead of the rubber balloon, a substance having a variable inner volume and capable of maintaining airtightness, such as a bellows or an air cylinder.

[0016]

[Effect of the device]

 As described in detail above, according to the present invention, the inside of the cover is kept airtight by interposing the packing between the cover and the PC plate that closes the open surface of the cover, and further, at one corner of the cover. An isolation chamber is provided whose both ends are closed by partition plates that come into contact with the PC plate via packing and partition the cross section of the cover. The isolation chamber is filled with air filter material and at the same time a ventilation hole is provided in one partition plate. In addition, a pipe is attached to the PC plate on the bottom of the isolation chamber so that one end is airtightly penetrated and opened to the isolation chamber. At the other end outside the touch panel of this pipe, contents such as rubber balloons are provided according to changes in internal pressure. By realizing a dust-proof touch panel in which a pressure-controlled container whose volume changes is connected to the inside of the pipe to maintain airtightness, the volume change of the internal gas due to the ambient temperature change is passed through the ventilation hole from the inside of the cover. The cover and PC board are absorbed by the expansion and contraction of the internal volume of the pressure regulating container caused by the movement of the internal gas through the communication passage that leads to the isolation chamber, passes through the pipe through the air filter material and reaches the pressure regulating container. Since there is no differential pressure from the atmospheric pressure, the inside of the dust-proof touch panel is kept airtight and the intrusion of dust from the outside is prevented. Therefore, it is possible to eliminate the deterioration of the touch panel performance due to the invading dust and the like. Further, since the cover and the PC plate are not subjected to a pressure difference from the atmospheric pressure, the touch panel can be made airtight without a strong structure, and a dustproof touch panel can be realized at low cost. Further, even if the pressure control container is damaged, the air filter material is interposed between the air filter material and the inside of the touch panel, so dust can be prevented from entering.

[Brief description of drawings]

FIG. 1 shows a dustproof touch panel according to an embodiment of the present invention,
FIG. 1A is a perspective view showing the overall appearance.
1B is a sectional view taken along the line AA in FIG.
FIG. 1C is a sectional view taken along the line BB of FIG.

FIG. 2 shows a conventional touch panel, FIG. 2 (a) is a perspective view showing the overall appearance, FIG. 2 (b) is a cross-sectional view taken along the line CC of FIG. 2 (a), and FIG. ) Is the DD of FIG.
FIG.

[Explanation of symbols]

 1 ... Dust-proof type touch panel 2 ... Cover 3 ... PC plate 4 ... Packing 5 ... Isolation chamber 6 ... Partition plate 7 ... Air filter material 8 ... Vent hole 9 ... Diode holding plate 10 ... Light emitting diode 11 ... Pipe 12 ... Pressure regulation container ( (Rubber balloon)

Claims (1)

[Scope of utility model registration request] 1. A PC plate is covered with a cover having a U-shaped cross section to form a frame surrounding a CRT display surface. Light emitting devices are arranged and housed on two adjacent sides of the frame, and two sides opposite to these sides. In the touch panel in which the light receiving elements are arranged and housed, the PC plate and the cover are airtightly coupled through a packing, and an isolation chamber that is airtightly partitioned by a partition plate is provided at one corner of the cover. Ventilation holes are provided in the partition plate of the isolation chamber, and a pressure-regulating container whose internal volume changes according to the internal pressure communicates with the inside of the pipe outside the pipe that is airtightly connected to the isolation chamber. The dust-proof touch panel is characterized by being installed airtightly.