JPS637456B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a pyroelectric element using a polymer pyroelectric film, and an object of the present invention is to provide a manufacturing method that increases the strength of metal vapor deposition, improves performance, and is excellent in mass production. With the goal.

As this type of pyroelectric element, there is one in which metal vapor deposition is performed on both sides of a polymer pyroelectric film. However, since the vapor deposition strength is weak, noise is likely to be generated due to peeling, and since the film is in the form of a film, the film may sag depending on the temperature, resulting in a decrease in performance.

The present invention eliminates these drawbacks and will be explained below with reference to an embodiment of the drawings. FIG. 1 is a process diagram for fixing a pyroelectric film to a frame. In FIG. In this case, frames 1 and 2 are
The pyroelectric film 3 is sandwiched between the frames 1 and 2 as shown in FIG. is set so that it can be applied.

Figure b shows a state in which the fixing base 4 is attached to the lower surface of the frame 2.

FIG. 2 is a diagram for explaining the vapor deposition process. First, the positive side (frame 2 side) of the pyroelectric film 3 fixed between the frames 1 and 2 as shown in FIG. and deposit the positive side first.
Note that during vapor deposition, the film 3 is washed and kept in a dry state.

Next, as shown in FIG. 2B, the frames 1 and 2 are reversed, a heating jig 6 having a heater 6a is set, and metal vapor deposition is performed on one side while heating. The purpose of using the heating evaporation method is to increase the evaporation strength, and it is desirable that the heating temperature be as high as the physical properties of the pyroelectric film 3 allow.
It is desirable to set the temperature to 70℃. In addition, as a vapor-deposited metal, the pyroelectric film 3 has a high absorption efficiency of infrared light.
NiCr, Ni, Al, etc. are preferable.

In the above description, only one side is heated and vapor-deposited, but both sides may be heated and vapor-deposited, but the strength of the side that is vapor-deposited first is lower than that of the side that is vapor-deposited later. This is because when vapor deposition is performed later, the film 3 will stretch due to the heat generated during the vapor deposition, and cracks will occur on the vapor deposition surface due to the difference in elongation rate between the metal surface on which the vapor deposition is applied and the film 3.

FIG. 3 shows the process of adhering the membrane rings 7, and FIG. 3a shows a state in which a plurality of rings 7 are placed on one surface of the pyroelectric film 3, and a weight 9 is placed with a cushion material 8 interposed therebetween.

Figure b is an enlarged view of a portion thereof, and numeral 10 indicates an adhesive.

FIG. 4 shows the step of cutting along the membrane ring 7 using the die set 11 as shown in FIG.

Note that when bonding the membrane ring 7, the bonding temperature should be equal to or higher than the heating temperature because if the bonding temperature is lower than the heating temperature during vapor deposition, the film 3 inside the membrane ring 7 may be bonded and fixed in a bent state. (70-80℃) is desirable.

However, since there is a pyroelectric effect when the temperature exceeds the Pauling temperature, the temperature must be lower than that.

Further, when the membrane ring 7 is adhesively fixed to the + side surface, the above procedure may be reversed.

As described above, according to the present invention, the strength of metal vapor deposition on the pyroelectric film can be increased, so that there is no need to specially smooth the surface by corona discharge, and manufacturing is easy.

Furthermore, since the formed pyroelectric element also has strong metal vapor deposition strength, it is possible to improve the performance and reliability of the pyroelectric element.

[Brief explanation of the drawing]

The drawings show a method of manufacturing a pyroelectric element according to an embodiment of the present invention, in which FIG. 1 is a process diagram showing the process of fixing a pyroelectric film to a frame, and FIG. 2 is a process diagram showing a vapor deposition process. Figure 3 is a process diagram showing the process of fixing the membrane ring, Figure 4 is a process diagram showing the process of cutting along the membrane ring, and Figure 5 is a perspective view of the pyroelectric element manufactured by the above process. It is. 1, 2...Frame, 2b...Rubber material, 3...
Pyroelectric film, 4...fixing stand, 6...heating jig,
7... Membrane ring, 8... Cushion material, 9... Weight, 10... Adhesive, 11... Die set.

Claims (1)

[Scope of Claims] 1. A pyroelectric film is held between frames having a rubber ring on at least one side, and metal vapor deposition is performed on one surface of the film, and metal vapor deposition is performed on the other surface by heating. A method for manufacturing a pyroelectric element, characterized in that a film ring is adhesively fixed to the metal vapor-deposited surface side by the above-mentioned heating, and then cut along the film ring. 2. The method of manufacturing a pyroelectric element according to claim 1, wherein the metal vapor deposition temperature by heating is 60 to 70°C, and the film ring is fixed by heating to 70 to 80°C.