JPS6038860Y2 - see-through plate - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improved structure of a see-through plate used in a see-through window, and in particular simplifies the structure of a dew condensation prevention heater and allows the amount of heat generated to be easily varied and selected.

Conventionally, this type of transparent plate has been widely used in refrigerator showcases, etc., but due to the temperature difference inside and outside the refrigerator, dew condensation formed on the surface of the transparent plate, making it difficult to see inside the refrigerator.

For this reason, linear electric heaters were arranged in a meandering pattern on the back side of the transparent plate, and electric heaters were installed in the spacers around the periphery of double-glazed glass to heat and prevent condensation. In order to prevent dew condensation on the entire viewing window, a heater with a large heat generating capacity is required, and the structure becomes complicated, including the addition of safety devices, and power consumption increases.

This proposal was developed in view of these points, and the figure will be explained below.

Reference numeral 1 denotes a see-through plate that forms a see-through window installed in the door body 5 of the freezer showcase 4, etc., which freely opens and closes the upper surface opening of the storage chamber 3 cooled by the cooler 2; It consists of transparent plates 6, 6', etc. made of a plurality of transparent glass or synthetic resin plates that are polymerized together.

This transparent plate 1 has a heat ray reflective film 7 having excellent visible light transmittance and heat ray reflectance attached to the back surface of at least the outermost transparent plate 6.

The heat ray reflective film 7 has a base layer 7a made of polyester or the like.
It is constructed by sequentially polymerizing and laminating a vapor deposited layer 7b made of a conductive metal such as silver, titanium oxide, or aluminum, and a transparent protective plate 7c, etc., and has a moisture-proof property and a selective transmission/reflection function, and transmits visible light. It reflects infrared rays.

The heat ray reflective film 7 is adhered to the back surface of the transparent plate 6 with an adhesive layer 7d, and a plurality of slits 8, 8, . It is formed so that it terminates inward from the edge of the layer 7b.

These slits8. As in the embodiment, it is preferable to arrange the ends so that the ends in the vapor deposited layer 7b are alternated.

Electrodes 9, 9 are formed at appropriate positions at both end corners of the vapor deposition layer 7b,
Connect to power supply 10.

The resistance value and distribution of the vapor deposited layer 7b can be adjusted by appropriately selecting the number and mutual spacing of the slits 8, 8, etc., as in the embodiment shown in FIG. 5, different from those in the embodiment shown in FIG. can be selected arbitrarily, and the amount of heat generated can be set arbitrarily.

Although it is preferable in actual work to use a layer 7b that is polymerized and laminated on the base layer 7a as in the embodiment, it may also be provided directly on the back surface of the transparent plate 6.

Since the present invention is constructed as described above, the vapor deposited layer made of conductive metal or metal oxide and having excellent visible light transmittance and heat reflectance becomes a resistor by providing slits, and generates heat when energized. Heat the transparent plate to prevent condensation.

Moreover, since this vapor-deposited layer covers almost the entire surface of the transparent plate,
A low amount of heat is sufficient without requiring a large amount of heat as in local heating, and the structure can be simplified, such as by simplifying electrical insulation.

Furthermore, most of the infrared rays from the outside that pass through the transparent plate and enter the storage chamber are reflected to the outside, and the reflection of this infrared rays causes the vapor deposited layer with excellent visible light transmittance and heat ray reflectance to heat the transparent plate. Since it is also used as a body, a dew condensation prevention device can be provided at low cost and the design and manufacture are simple.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a refrigeration showcase equipped with the transparent plate of the present invention, Fig. 2 is a perspective view of the door body, Fig. 3 is a sectional view of the main parts, and Fig. 4 is a schematic plan view of the vapor deposited layer. , FIG. 5 is a schematic plan view of a vapor deposited layer showing another embodiment. 6... Transparent plate, 7b... Vapor deposition layer, 8.
·····slit.

Claims (1)

[Scope of utility model registration request] The transparent plate is provided with a heat ray reflective film having a vapor deposited layer made of conductive metal with excellent visible light transmittance and heat ray reflectance on the back surface, and a plurality of slits are provided at intervals in the vapor deposited layer. A see-through plate characterized in that the vapor-deposited layer is provided as an electric heating element.