JPH0314694Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is based on a synthetic resin that can be used to reduce heat generated by a lamp in a display device in which a display board with a transparent part is disposed in the opening of a synthetic resin case, and an internal lamp is turned on to provide an illuminated display. This relates to a heat shielding device for a manufactured case.

Conventionally, this type of display device has been applied to various fields such as abnormality warning display for vehicles and gear indicator as seen in Japanese Utility Model Publication No. 57-41821. Centralization is being planned.

Figure 1 shows the general structure of such a display device, in which a synthetic resin case 1 is divided into rooms 2 corresponding to the number of display items, a lamp 3 is arranged inside each room, and the case opening is divided into rooms 2 corresponding to the number of display items. A transparent display board 4 arranged on the screen is used to provide illumination display.

By the way, a considerable amount of heat is generated by lighting the lamp, and since the case 1 is closed, the heat is not dissipated well, and the temperature inside the room 2 increases significantly.

A material with good heat resistance that can withstand such high temperature conditions must be selected for the synthetic resin case 1, but it is extremely expensive. In particular, as the number of display items increases and the number of display items increases, the capacity of room 2 becomes smaller and the distance between the lamp 3 and the inner wall of the case narrows.
This is the part that receives the most direct heat from the lamp 3 and reaches a high temperature, and the thermal deformation of this part is more significant than that of other parts of the inner wall of the case.

Therefore, as described in Japanese Utility Model Application Publication No. 57-190572, a cylindrical body 9 that reflects light well is attached to the inner wall of the cylindrical portion 7 that houses the light source 10 of the indicator device.
There is a structure in which the cylindrical body 9 is provided in contact with the cylindrical part 7, and this cylindrical body 9 provides good illumination to the indicator dial 15 disposed on the upper part, and also prevents the irradiation heat of the light source 10 from being directly transmitted to the cylindrical part 7. Products that also have a heat shielding effect are known.

However, since the cylindrical body 9 is provided in contact with the cylindrical part 7, of the irradiated heat that the cylindrical body 9 receives, the heat that is generated in the cylindrical body 9 without being reflected is directly transmitted to the cylindrical part 7 and has an adverse effect. It will affect you. In other words, even if the cylindrical body 9 having the above-mentioned reflective effect is provided, if heat continues to be transmitted as it is through the cylindrical body 9, it cannot be said that thermal deformation will not occur on the inner wall of the cylindrical part 7. This does not solve the aforementioned problem that thermal deformation is more likely to occur as the light source 10 is approached.

The present invention was made to solve the above problem, and includes a cylindrical metal heat shield that shields between the lamp and the inner wall of the case, and a part or all of the space between the heat shield and the inner wall of the case. An object of the present invention is to provide a heat shielding device having good heat resistance by having a structure in which the heat shielding device is arranged and fixed with an air layer interposed therebetween to slow down heat transfer.

Hereinafter, embodiments of the present invention will be described in detail based on the accompanying drawings.

In Figure 2, the basic structure of the display device is shown in Figure 1.
The figure is similar to the conventional device, and a synthetic resin case 1 is divided into rooms 2 for display items, and a lamp 3 is housed in each room to illuminate and display a display board 4 disposed in the opening. There is. Here, reference numeral 5 denotes a metal heat shield plate, which has a cylindrical shape with a smaller diameter than the inner diameter of the chamber 2 made by bending a flat metal plate, and has a plurality of protrusions 6 formed at its lower end. At the bottom of the case 1 and at predetermined locations in each room 2, there are protrusions 6 of the metal heat shield plate 5.
A groove 7 is formed into which the metal heat shield plate 5 is press-fitted, and by press-fitting the protrusion 6 into the groove 7, the metal heat shield plate 5 is placed and fixed in the room 2, covering the lamp.

As a result, as shown in FIG. 2d (the thickness of the arrow represents the amount of heat), a heat shield wall is formed between the lamp 3 and the inner wall of the room 2 by the metal heat shield plate 5, and furthermore, the metal The air layer 5 between the heat shield plate 5 and the inner wall of the room 2 forms a heat shield gap.

The irradiated heat emitted by the lamp 3 is first transmitted to the metal heat shield plate 5. This irradiation heat is applied to the lamp 3 of the metal heat shield plate 5.
The part closest to the irradiation is most intensely irradiated, and the temperature becomes highest in this part, but since the heat shield plate 5 itself is made of metal, the amount of heat generated by this irradiation does not cause thermal deformation. Further, since metal is a substance with good thermal conductivity, the irradiated heat does not remain in the above portion but tends to be transmitted to the entire metal heat shield plate 5 (dispersion effect). In other words, the metal heat shield plate 5 acts so that only a specific portion does not reach a high temperature and the entire temperature becomes uniform. The heat that is uniformly transmitted through the metal heat shield plate 5 tries to radiate toward the lower temperature direction, that is, toward the case 1, but due to the above-mentioned dispersion effect, the heat radiated from a specific location is not at a high temperature; Heat is dissipated evenly.

There is an air layer S between the metal heat shield plate 5 and the case 1, and since air is a substance that conducts heat,
This air layer S slows down the heat transfer from the metal heat shield plate 5, suppressing the temperature rise of the case 1, and thereby preventing thermal deformation.

In other words, we focused on the resistance of metal to thermal deformation and its good thermal conductivity, and used it as a heat shield plate to block the irradiation heat of the lamp 3 and to slow the transmission of heat with the heat shield gap. This allows the case 1 to be prevented from deforming.

FIG. 3 shows another embodiment of the metal heat shield plate 5, in which a locking claw 8 bent in a U-shape is integrally formed at the upper end, and a groove portion into which the locking claw 8 can be press-fitted into the upper surface of the case 1. The structure is the same as that of the embodiment shown in FIG. 2 except for the fixing structure 9 formed therein. In this case as well, the air layer S is formed with a constant gap around the entire circumference between the metal heat shield plate 5 and the inner wall of the room 2, and together with the direct heat of the lamp 3, it suppresses heat transfer well and increases the temperature of the synthetic resin case 1. It can be effective in alleviating the

FIG. 4 shows still another embodiment of the present invention, which provides a structure for more easily attaching the metal heat shield plate 5 to the case 1.

That is, a bent elastic locking arm 10 is formed to extend from the upper end of the metal heat shield plate 5 to sandwich the side wall of the case 1. Therefore, the metal heat shield plate 5 is connected to the outer circumferential surface of the side where the locking arm 10 is bent and suspended, and the elastic locking arm 1
The case 1 is fixed with the side wall of the case 1 sandwiched between the case 1 and the case 1. In this case, the air layer S that slows down the heat transfer between the metal heat shield plate 5 and the inner wall of the room 2 will be formed only on the other three sides, and it is undeniable that the heat shielding effect will be slightly reduced. It can be adopted as a sufficient structure depending on the amount of heat generated by the lamp 3 and the size of the room 2, and it has the advantage that it can be provided at a low cost as an additional part that does not require modification to the case of a conventional display device.

In addition, FIGS. 5a and 5b show a modification of the heat shielding device of the present invention. In the case 1 made of synthetic resin, the integrated partition wall that partitions the storage room for lamps 3 for each display item is omitted, and each lamp 3 is A cylindrical metal heat shield plate 5 that covers
A single metal plate is bent to form a plurality of rooms in a row, and each room is partitioned by a metal heat shield plate 5.

In this case as well, the metal heat shield plate 5 is interposed on the inner wall side of the case 1 that receives direct heat from the lamp 3, and an air layer S is formed to moderate heat transfer, so that a similar heat shield effect can be obtained. Needless to say. In addition, according to the above structure, there is no need for a partition wall to separate the lamp 3 storage rooms for each display item, so the area of the synthetic resin case 1 relative to the lamp 3 is reduced, which improves heat resistance and allows easier assembly. possible.

As described in detail above, the present invention is a display board with a transparent part attached to the opening of a synthetic resin case, which displays illumination using an internal lamp. A cylindrical metal heat shield plate is installed and fixed with a heat shield gap between the heat shield plate and the inner wall of the case to reduce heat transfer, so direct heat from the lighting lamps is removed from the metal heat shield. A two-stage heat shielding effect is achieved: the heat generated by the metal heat shield is dispersed throughout the metal heat shield, the heat radiated from the metal heat shield is made uniform, and the heat is further alleviated by the heat shield gap. It is possible to suppress the significant temperature rise of the synthetic resin case and prevent damage such as thermal deformation, and it is possible to create a highly reliable heat shielding device with a simple structure without using expensive heat-resistant materials. This is something that can be provided.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional display device, FIG. 2a is an exploded perspective view showing the heat shielding structure of the display device according to the present invention, FIG. 2b is a plan view of the device, and FIG. 2c is the same device. Figure 3(d) is a partial cross-sectional view showing the dispersion and heat radiation effect of the metal heat shield plate of the present invention, the heat shield gap, and Figure 3(a) is another implementation of the heat shield device of the present invention. FIG. 4B is a sectional view showing the assembled state of the device; FIG. 4A is an exploded perspective view showing still another embodiment of the heat shielding device of the present invention; FIG. FIG. 5 is a sectional view showing an assembled state, and FIG. 5 is a plan view showing a modification of the device of the present invention. 1...Synthetic resin case, 2...Room, 3...Lamp, 4...Display board, 5...Metal heat shield plate, 6...
Projection, 7, 9... Groove, 8... Locking claw, 10...
Locking arm, S... heat shielding gap.

Claims (1)

[Scope of utility model registration request] A display device in which a display board that is at least partially transparent is disposed in an opening of a synthetic resin case, a lamp is housed in the case, and the display board is illuminated by lighting the lamp. A cylindrical metal heat shield plate having a diameter smaller than the inner diameter of the case storage portion is provided, and the heat shield plate is inserted into the case so as to cover the lamp, and the space between the inner wall of the case and the heat shield plate is inserted. 1. A heat shielding device characterized in that the heat shielding device is arranged and fixed with a heat shielding gap interposed in part or all of the part.