JP2606288Y2 - Infrared detector - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal infrared detector for detecting an object such as a human body which generates infrared rays by means of a pyroelectric element.

[0002]

2. Description of the Related Art As shown in FIG. 6, a conventional infrared detector of this type has conductor patterns 2a to 2c on an insulating substrate 1 made of ceramic or glass epoxy resin or the like.
Are formed on the insulating substrate 1, and the conductor patterns 2a, 2a
b, the conductive supports 3, 3 are fixed by solder or the like, and the rectangular pyroelectric element 4 is placed thereon, and both ends thereof are placed on the supports 3, 3 and electrically connected by solder or the like. It is fixed. Under the pyroelectric element 4, a peripheral circuit component 5 such as an FET is provided.
Are fixed to the conductor patterns 2b and 2c by soldering or the like. The pyroelectric element 4 is not only composed of a single pyroelectric element, but also detects a movement of a human body. For example, as disclosed in Japanese Patent Publication No. 3-26334, a pair of pyroelectric elements is integrated. There is also a configuration in which the output is amplified in the peripheral circuit component 5 by being connected in parallel or in series with an electrically opposite polarity.

Reference numeral 6 denotes a conductive cap made of a metal or the like which is hermetically bonded to the insulating substrate 1 with an adhesive, and 7 denotes a head opening 6a of the conductive cap 6 which is hermetically bonded and sealed with an adhesive 8. It is an attached infrared transmission filter. The cap 6 is formed to be narrower than the substrate 1 as disclosed in Japanese Utility Model Laid-Open No. 2-140427. The reason is that the cap 6 is fixed to the substrate 1 with an adhesive, and is to prevent the adhesive from leaking from the edge of the substrate 1.

[0004]

As described above, in the conventional infrared detector, the width of the cap 6 is set to be smaller than that of the substrate 1, so that the cap 6 must be set at an accurate position on the substrate 1. Therefore, there is a problem that the position of the infrared transmission filter 7 with respect to the pyroelectric element 4 is shifted, and the visual field characteristics are deteriorated. Also, the cap 6 is shifted
And the adhesive leaks from the substrate 1 or forms around the substrate 1
Adhesive leaks into the semicircular concave terminals 20 to 22
There was a problem.

In view of the above problems, the present invention can accurately position and fix a cap on a substrate on which a pyroelectric element or the like is mounted, thereby preventing deterioration of visual field characteristics.
It is an object of the present invention to provide an infrared ray detector that can prevent the adhesive from leaking around the substrate and the terminals .

[0006]

According to the present invention, in order to achieve the above object, a pyroelectric element and its peripheral circuit parts are mounted on an upper surface of a rectangular insulating substrate, and an infrared transmitting filter is provided in an opening in a head. The attached rectangular cylindrical cap is placed on the conductive pattern forming surface of the insulating substrate so as to cover the pyroelectric element and its peripheral circuit components, and the insulating substrate and the cap are bonded with an adhesive. In the infrared detector provided with terminals around the insulating substrate, a plurality of cap positioning projections projecting outward to a skirt portion of the cap, which is a joint with the insulating substrate, provided to avoid the formation of terminal and disposed substantially equal position of the tip of the projecting portion to the position of the corresponding end of the insulating substrate, wherein the key
Cap bottom, peripheral portion of substrate, and terminal forming portion
Are separated from each other. Further, according to the present invention, an insulating material for setting a cap position is fixed to at least a portion of the portion facing the inside or outside on the insulating substrate along the inside or outside of the skirt portion of the cap. A bank is provided, and the cap hem and front
The peripheral portion of the substrate and the terminal forming portion are separated from each other.
Characterized in that was.

[0007]

In the present invention, since the plurality of cap positioning projections are provided on the cap skirt, an appropriate jig or the like is brought into contact with the tip of the projection and the side of the substrate to align the position of the infrared transmission filter. Is set exactly. In the case where the bank portion is provided, the same positioning action is performed by making the inside or outside of the skirt portion of the cap follow the bank portion. Also, by the protruding portion or the bank portion
By the positioning action, the outer periphery of the terminal forming portion and the skirt portion
And the space between the skirt and the periphery of the substrate.
The space between them is set accurately.

[0008]

1 is a perspective view showing one embodiment of an infrared detector according to the present invention, FIG. 2A is a plan view of the embodiment, and FIG. 2B is a longitudinal sectional view thereof. In these figures, 1
Is a rectangular insulating substrate made of ceramic or glass epoxy resin, etc., 2a to 2c are conductor patterns formed on the front and back surfaces thereof, 2a is a ground pattern, 2b,
c is a conductor pattern for terminal electrodes electrically connected to a component 5 described later. 20 to 23 are conductor patterns 2 respectively
a to 2c and a semicircle connected to a conductor pattern (not shown)
It is an arc-shaped concave terminal.

A pyroelectric element 4 is mounted on the insulating substrate 1 via a support 3, and a peripheral circuit component 5 such as an FET is arranged below the pyroelectric element 4. Reference numeral 6 denotes a rectangular cylindrical conductive cap made of metal or the like having an infrared transmitting filter 7 attached to the head opening 6a. The conductive cap 6 prevents malfunction of the infrared detector due to external noise. That's why. The cap 6 is adhered to the insulating substrate 1 with an adhesive 8 and hermetically sealed.

The skirt 6b of the lower opening surface of the cap 6
A protruding portion 6c is provided at the center of one side a of the two sides a and b facing each other.
Are formed at both ends of the other side b, and the protrusions 6 have the same protrusion width.
d, 6e, and as shown in FIG.
The width between the tip of c and the tips of the protrusions 6d and 6e on the opposite side is equal to the width W of the insulating substrate 1.

In this infrared detector, as shown in FIG. 2 (B), a cap 6 is placed on a substrate 1 and one side of the substrate 1 and a projection 6c of the cap 6 are used to cure a surface perpendicular to the substrate 1. The position of the cap 6, that is, the position of the infrared transmitting filter 7, can be accurately set with respect to the substrate 1 by bringing the tool 10 into contact with the other jig 11 on the other side of the substrate 1. The protrusions 6c to 6e allow the cap 6
Formation of skirt portion 6b, outer peripheral portion of substrate 1, and terminals 20 to 23
Since the parts are separated from each other, a space for preventing leakage of the adhesive and a space between the concave terminals 20 to 23 and the skirt 6b of the sides a and b can be accurately secured therebetween .

In this embodiment, the protruding portions 6 are formed only on two sides a and b of the four sides of the skirt portion 6b of the rectangular cap 6.
Although c to 6e are formed, as shown in FIG. 3, the protrusions 6f to 6i are formed on all the four sides a to d of the skirt portion 6b of the cap 6 instead of the two opposing sides. If the protrusions are provided, the number of the protrusions can be reduced), and the alignment between the substrate 1 and the cap 6 can be performed in all the vertical and horizontal directions. to this
Between the side surface of the substrate 1 and the skirt 6b of the cap 6.
Space for preventing leakage of formed adhesive and concave terminal
The space between 20-23 and the skirt 6b of the four sides a-d is accurate
Can be secured.

FIG. 4A is a longitudinal sectional view showing another example of the positioning means for the cap 6 according to the present invention, and FIG. 4B is a transverse sectional view thereof (internal components are omitted). In the example, the bank 12 is provided by fixing an insulating material such as glass epoxy resin along the inside of the skirt 6b of the cap 6 on the substrate 1. In this example, by fitting and adhering the skirt 6b of the cap 6 to the bank portion 12, the position of the opening 6a and thus the position of the infrared transmission filter 7 are accurately set so that the deterioration of the visual field characteristics due to the displacement is achieved. In addition to the prevention, the presence of the bank 10 increases the bonding area and increases the bonding strength. In addition, the protrusions 6f-
6i, the side surface of the substrate 1 and the cap 6
A seal for preventing leakage of the adhesive formed between the
Between the pace, the concave terminals 20 to 23 and the skirts 6b of the sides a and b.
Space can be secured accurately.

Note that the bank 12 is a hem 6b of the cap 6.
May not be provided over the entire inner circumference, but may be provided partially, or as shown in FIG. 5, may be provided outside the hem portion 6b, and furthermore, the bank portions 13 are provided on both the inside and the outside. Is also good.

[0015]

According to the first aspect of the present invention, the cap can be accurately positioned on the substrate by aligning the tip of the projecting portion of the cap with the side surface of the substrate. In addition, the protrusions allow the cap
The gap between the outer periphery of the plate and the terminal formation
Therefore, a space for preventing leakage of the adhesive between the cap and the skirt of the cap and a space between the concave terminal and the skirt can be accurately secured. Thus, in the surface-mounted infrared detector, it is possible to reliably prevent the adhesive from leaking from the substrate, prevent the adhesive from leaking to the terminals, and prevent the substrate from being poorly connected to the mother substrate. .

According to the second aspect, the position of the cap with respect to the substrate can be accurately set by aligning the inside or outside of the skirt of the cap with the bank on the substrate. to this
Thus, as in the first aspect, it is ensured that the adhesive leaks from the substrate.
And prevent leakage of the adhesive to the terminals.
Wear. In addition, due to the presence of the bank, the bonding area with the cap
And the adhesive strength increases.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of an infrared detector according to the present invention.

FIG. 2A is a plan view of the present embodiment, and FIG. 2B is a longitudinal sectional view thereof.

FIG. 3 is a plan view showing another embodiment of the infrared detector according to the present invention;

FIG. 4A is a longitudinal sectional view of another embodiment of the present invention,
(B) is a cross-sectional view thereof (internal components are omitted).
It is.

FIG. 5 is a cross-sectional view showing another embodiment of the present invention (omitted from internal components).

FIG. 6 is a perspective view showing a conventional infrared detector.

[Explanation of symbols]

1: Insulating substrate, 2a to 2c: conductor pattern, 3: support base, 4: pyroelectric element, 5: peripheral circuit component, 6: cap, 6a: opening, 6b: bottom, 6c to 6i: protrusion ,
7: infrared transmission filter, 8: adhesive, 10, 11: jig, 12, 13: bank, 20 to 23: terminal

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-128316 (JP, A) JP-A-2-177462 (JP, A) JP-A-60-8847 (JP, U) JP-A-2-88 70445 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) G01J 1/02 G01J 5/02 G01V 9/04 G08B 13/19-13/191 H01L 23/02-23/04 H01L 37/00-37/02

Claims (2)

(57) [Scope of request for utility model registration] 1. A rectangular tubular cap having a pyroelectric element and its peripheral circuit components mounted on an upper surface of a rectangular insulating substrate, and an infrared transmitting filter attached to an opening in a head portion. It was placed on the conductor pattern forming surface of the insulating substrate so as to cover the peripheral circuit components, and the insulating substrate and the cap were bonded with an adhesive, and terminals were provided around the insulating substrate. In the infrared detector, a plurality of cap positioning protrusions that protrude outward from a skirt portion of the cap, which is a joint portion with the insulating substrate, are provided avoiding the terminal forming portion, and a tip position of the protrusion portion is provided. Are disposed almost equally at the positions of the corresponding ends of the insulating substrate, and the bottom of the cap, the peripheral portion of the substrate, and the terminal
An infrared detector, wherein the infrared detector is separated from the forming part . 2. A cap having a pyroelectric element and its peripheral circuit components mounted on an upper surface of an insulating substrate, and a cap having an infrared transmission filter attached to an opening in a head portion so as to cover the pyroelectric element and its peripheral circuit components. An infrared detector which is placed on the conductive pattern forming surface of the insulating substrate, and the insulating substrate and a cap are bonded to each other with an adhesive, and a terminal is provided around the insulating substrate. along the inside or outside of the skirt, at least a portion of the inner or opposed portions on the outside of the insulating substrate is provided with a bank portion formed by sticking an insulating material for the cap position setting, the cap And the peripheral portion of the substrate and the terminal
An infrared detector, wherein the infrared detector is separated from the forming part .