JPH0116017Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pyroelectric type infrared detection device that detects infrared rays using a pyroelectric effect, and particularly relates to an improvement in the support structure of a pyroelectric body that constitutes the main body of the detector.

Since the output of a pyroelectric infrared detector corresponds to the temperature change of the pyroelectric body caused by absorption of incident infrared rays, it is necessary to reduce the heat capacity and heat dissipation of the pyroelectric body. It is also necessary to suppress the effects of vibration peculiar to piezoelectric bodies in order to reduce noise. Taking these points into consideration, conventional infrared detectors are
A part or the entire circumference of the pyroelectric body 1 that does not cover the back surface of the infrared receiving part 2 is attached to the base 4 with an elastic body 3 interposed therebetween.
(See Figure 1). That is,
Vibration countermeasures are taken by providing the pyroelectric body 1 on the base 4 via an elastic body, and by limiting the elastic body to the vicinity of the pyroelectric body and making the back surface of the infrared receiving part 2 hollow, the heat capacity can be reduced. and reduce heat dissipation.

However, according to this conventional method, it is actually necessary to use a silicone resin with low hardness as the elastic body, but since this resin has a low viscosity before hardening, when the pyroelectric body is mounted on it, the resin becomes weak. Although it has a low viscosity, it can be expanded and hollow parts may be filled with resin.
In other words, it is technically very difficult to make the back surface of the infrared receiver hollow and mount the area around it in resin, and therefore it is not suitable for mass production.

In addition, since the degree of resin spreading is not uniform,
The contact area between the elastic body and the pyroelectric body differs between individual infrared detectors, resulting in variations in characteristics.

Because the base is flat, the accuracy of the mounting position of the pyroelectric material is poor.

There are other drawbacks.

Therefore, the present invention provides a new means that can eliminate all of these drawbacks.

Therefore, the pyroelectric infrared detector according to the present invention is
The base on which the pyroelectric body is provided is constituted by baking an overcoat glass onto a substrate, and all or a part of the periphery of the base except for the back surface of the infrared receiving part of the pyroelectric body is installed at a position corresponding to the installation, The present invention is characterized in that a mounting base is provided by raising a part of the overcoat glass to a certain height.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In Figures 2 and 3, 11 is the base;
2 is a pyroelectric body, and 13, 13 is an infrared light receiving section.
The base 11 is constructed by baking an overcoat glass 15 onto a substrate 14.
In addition to protecting the gate leak resistance 16, the substrate 1
It is applied to both the upper and lower surfaces of the substrate 14 in order to protect the substrate 4 from humidity and the like.

The overcoat itself is placed at a certain height on the upper surface of the overcoat glass 15 at a position where all or part of the periphery of the pyroelectric body 12 except for the back surface of the infrared light receiving section 13 is installed. A mount base 17 is formed by raising it. In the illustrated example, the mount base 17 includes a pyroelectric material 12
It is formed along two opposing sides of. However, 4
It may be formed along the sides, and the pyroelectric body 12
They may be formed at positions corresponding to the four corners of.

In order to provide the pyroelectric body 12 on the mount base 17, silicone resin 18 serving as an elastic body may be applied to the upper surface of the mount base 17, and the pyroelectric body 12 may be mounted thereon. In this case, by mounting the pyroelectric body 12, the excess low viscosity silicone resin 18
The mount base 17 will be expanded.
Because of the raised shape, the expanded silicone resin 18 flows down along the side surface of the mount base 17. Therefore, the contact surface between the pyroelectric body 17 and the resin does not become large, and the back surface of the infrared light receiving section 13 is not buried with the silicone resin 18. It should be noted that if the top surface of the mount base 17 is colored when forming the mount base 17, it can be used as a marker for the pyroelectric body mount position, which is extremely convenient during manufacturing.

Since the pyroelectric infrared detector according to the present invention is constructed as described above, it has the following effects.

Since the base on which the pyroelectric body is installed is constructed by baking an overcoat glass onto the substrate, for example, as shown in the example, it is a so-called dual type in which two infrared receiving sections are arranged side by side on the pyroelectric body. Whether it is a so-called single type in which only one infrared receiver is provided on the pyroelectric body, the infrared receiver is electrically insulated from the board, making it easy to connect lead wires, etc. can be done.

A mount base formed by raising a part of the overcoat glass to a certain height is provided at a position corresponding to all or a part of the periphery of the base except for the back surface of the infrared receiving part of the pyroelectric body. Therefore, by applying a resin that will become an elastic body onto this mount base and mounting the pyroelectric body on top of it, the excess resin will flow down from the mount base and the pyroelectric body and resin will be connected. The contact area is kept constant, and the hollow part on the back surface of the infrared receiver is not filled with resin.
Therefore, regardless of the amount of resin applied, the contact area between the pyroelectric body and the resin can be kept constant, and the back surface of the infrared receiver can be kept hollow, making it suitable for mass production. Moreover, the variation in characteristics is also significantly improved.

Furthermore, since the mount base is formed from the overcoat glass itself, the mount base can be formed in the step of baking the overcoat glass onto the substrate, and no new process for forming the mount base is required.

Furthermore, since the mount base is formed to protrude from the base, this mount base can be used as a positioning reference for mounting the pyroelectric body, and therefore the pyroelectric body can be mounted with high positional accuracy. be able to. In particular, it would be more convenient to color the top surface of the mount as in the embodiment.

[Brief explanation of the drawing]

Figure 1 is a side view of a conventional pyroelectric infrared detector.
FIG. 2 is a plan view of a pyroelectric infrared detector as an embodiment of the present invention, and FIG. 3 is a side view of FIG. 2. DESCRIPTION OF SYMBOLS 11...Base, 12...Pyroelectric material, 13...Infrared receiver, 14...Substrate, 15...Overcoat glass, 17...Mount stand.

Claims (1)

[Scope of utility model registration request] The base on which the pyroelectric body is provided is constituted by baking an overcoat glass onto a substrate, and all or a part of the periphery of the base except for the back surface of the infrared receiving part of the pyroelectric body is installed at a position corresponding to the installation, A pyroelectric infrared detector characterized in that a mount base is provided by raising a part of the overcoat glass to a certain height.