JPS6015149Y2 - Pyroelectric infrared detection element - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pyroelectric infrared detection element that includes a pyroelectric pellet that generates an electric charge depending on the amount of change in incident infrared radiation.

In the conventional pyroelectric infrared detecting element of this type, as shown in FIG. 1, the pyroelectric pellet 3, which has front and back electrodes 1 and 2 on both sides and generates a charge according to the amount of change in incident infrared rays, is mounted on an insulating support. 4 was adhered to the upper surface with a conductive adhesive 5, and the lead wire 6 of the back electrode 2 was attached to the side surface of the adhesive with a conductive adhesive 7.

However, the side surface of the adhesive 5 was very thin, and therefore the step of attaching the lead wire 6 was very difficult.

Therefore, in order to eliminate such difficulty, that is, to remove the lead wire 6, the pyroelectric pellet 3 is glued to the upper surface of a metal support 8 with a conductive adhesive 5, as shown in FIG. By electrically coupling the pellet 3 and the metal support 8, progress is being made in making the metal support 8 have the effect of the lead wire 6.

However, since the output of the pyroelectric pellet 3 generally increases as its dissipated heat decreases, using a metal with high thermal conductivity as the support 8 as shown in FIG. This resulted in a decrease in

The present invention has been developed in view of these points, and an embodiment of the present invention will be described in detail below with reference to FIGS. 3 and 4.

In Fig. 3, 9 is a pyroelectric pellet made of lithium tantalate (LiTa03) crystal that generates electric charge according to the amount of change in incident infrared rays.
The pellet has front and back electrodes 10.11 made of Ni--Cr vapor deposited films on both sides.

12 is a metal support made of copper, aluminum, phosphor bronze, etc. that supports the pellet 9; 13 is a conductive adhesive that adheres the pellet 9 and the support 12; 14 is an adhesive that does not contain silver paste; A thin piece of low thermal conductivity is interposed between the 13 layers and fills the adhesive 13 into the opening groups 15, 15, . . . as cutouts, as shown in FIG. It is formed.

Note that 16 is a lead wire bonded onto the surface electrode 10 with a conductive adhesive 17.

Therefore, the pyroelectric pellet 9 and the metal support 12 can be extremely effectively shielded from heat by the thin piece 14 with low thermal conductivity, and the thin piece 1
4 has a group of openings 15, 1 filled with conductive adhesive 13.
5... are provided, the back electrode 11 of the pyroelectric pellet 9 and the metal support 12 are electrically coupled via the conductive adhesive 13.

Therefore, while maintaining such electrical coupling, the aperture group 15.1
5...If the area is minimized, a decrease in the output of the pyroelectric pellet 9 can be efficiently prevented.

As detailed above, according to the present pyroelectric infrared detection element,
With a simple structure in which a low thermal conductivity material is placed on the conductive adhesive layer that adheres the pyroelectric pellet and the metal support,
The support base can also function as a back electrode lead line without reducing the output of the pyroelectric pellet.

[Brief explanation of the drawing]

Figure 1 is a front view of a conventional pyroelectric infrared detection element;
3 is a longitudinal cross-sectional view of the pyroelectric infrared detecting element according to the embodiment of the present invention, and FIG. 4 is a plan view of the main part thereof. 9... Pyroelectric pellet, 12... Metallic support base, 13... Conductive adhesive, 14...
...Low thermal conductivity thin piece, 15.15...Opening group (notch).

Claims (1)

[Claims for Utility Model Registration] 1. A pyroelectric pellet that has at least one pair of electrodes and generates a charge according to the amount of change in incident infrared rays, a metallic support base that supports the pyroelectric pellet, and the pyroelectric pellet described above. A pyroelectric infrared detection element comprising: a conductive adhesive for bonding at least one electrode of a pellet to a support; and a low thermal conductivity member embedded in the adhesive layer. 2. The pyroelectric infrared detecting element according to claim 1, wherein the low thermal conductivity member is a thin piece having a cutout portion filled with the adhesive.