JPH08329807A - Molded mold temperature switch - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a high-quality sealed mold type temperature switch in which the resin thickness between the temperature switch element and the mounting surface does not fluctuate, the insulation characteristics do not deteriorate, and in addition the appearance defect does not occur. thing. [Structure] Permanent magnets 1a and 1b are provided on both sides of an annular temperature-sensitive magnetic body via magnetic gap spacers 3a and 3b to form a tubular body, and a reed switch 4 is inserted into the tubular body. In a sealed mold type temperature switch in which the temperature switch element in which the leads 4a and 4b of the reed switch are connected to the lead frame 5 is sealed and molded with molding resin and the signal lead-out lead of the lead frame 5 is led out in the same direction. On the end surface of the permanent magnet 1a on the side opposite to the surface of the lead frame 5 on which the lead for signal extraction is provided, a guide spacer 7 having a larger outer diameter than the permanent magnet 1a and made of the same material as the molding resin is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed mold type temperature switch used for monitoring overheating of home electric appliances and industrial equipment.

[0002]

2. Description of the Related Art FIG. 3 shows a perspective view of a conventional sealed mold type temperature switch, and FIG. 4 shows a perspective view of a temperature switch element used therein. As shown in FIG. 4, the temperature switch element used in the conventional sealed mold type temperature switch includes permanent magnets 1 a and 1 b, a temperature-sensitive magnetic body 2, and a magnetic gap spacer 3.
a and 3b are arranged on the outer peripheral portion of the reed switch 4, and the leads 4a and 4b of the reed switch are joined to the lead frame 5.

Further, as shown in FIG. 3, a conventional sealed mold type temperature switch is formed by molding such a reed switch element with a molding resin 6.

[0004]

However, when the temperature switch element is sealed and molded, since the lead frame 5 is fixed to the molding die in a cantilever manner, the positioning of the temperature switching element in the die is possible. Difficult, after sealing molding,
There is a problem in that the thickness of the resin between the permanent magnets 1a and 1b, the temperature-sensitive magnetic body 2, the magnetic gap spacers 3a and 3b, and the mounting surface varies, which causes deterioration of insulation characteristics and poor appearance.

The present invention eliminates these problems and does not cause variations in the resin thickness between the temperature switch element and the mounting surface.
It is an object of the present invention to provide a high-quality sealed mold temperature switch in which the insulation characteristics are not deteriorated and the appearance is not defective.

[0006]

In order to solve the above-mentioned problems, a sealed mold type temperature switch according to the present invention is provided with a permanent magnet on an end face of a permanent magnet, particularly on a side opposite to a lead frame lead-out side of a temperature switch element. Larger than the outer diameter of the magnet,
Moreover, a spacer made of the same material as the molding resin is provided.

That is, according to the present invention, permanent magnets are provided on both sides of an annular temperature-sensitive magnetic body via magnetic gap spacers to form a tubular body, and a reed switch is inserted into the tubular body.
A sealing molding die in which the lead of the reed switch is connected to the lead for signal lead-out of the lead frame, the lead of signal lead-out of the lead frame is led out in the same direction, and the temperature switch element is sealed and molded with an insulating resin. In the temperature switch, on the end surface of the permanent magnet on the side opposite to the side on which the lead for signal extraction of the lead frame of the temperature switch element is present, the outer diameter of the permanent magnet is larger than that of the permanent magnet, and the same material as the molding resin is used. A sealed mold type temperature switch characterized in that a guide spacer is provided.

[0008]

Function: A spacer, which is larger than the outer diameter of the permanent magnet and is made of the same material as the molding resin, is provided on the end surface of the permanent magnet on the side opposite to the lead frame lead-out side of the temperature switching element, so that the resin pressure during molding By restricting the first swinging part, the swinging of the temperature switch element up and down, right and left is limited, so that it is possible to prevent exposure of the permanent magnet, the temperature sensitive magnetic body, and the magnetic gap spacer, and the minimum distance. Can be secured. Even if the spacer is exposed, since it is made of the same material as the molding resin, the insulating resin integrally covers each element, so that insulation is ensured.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a temperature-sealing mold type temperature switch according to the present invention will be described below with reference to the drawings.

FIG. 2 is a plan view and a front view showing an embodiment of the temperature switching element of the present invention.

As shown in FIG. 2, the temperature switch element is
The permanent magnets 1a and 1b, the temperature-sensitive magnetic body 2, the magnetic gap spacers 3a and 3b, the guide spacer 7, the reed switch 4, and the lead frame 5.

The lead frame 5 includes permanent magnets 1a, 1a.
b, temperature-sensitive magnetic body 2, magnetic gap spacers 3a, 3b,
The guide spacer 7 is joined to the leads 4a and 4b of the reed switch 4 arranged on the outer peripheral portion.

FIG. 1 is a plan view and a front view showing an embodiment of a sealed mold type temperature switch according to the present invention.

As shown in FIG. 1, the sealed mold type temperature switch comprises the permanent magnets 1a and 1b, the temperature sensitive magnetic body 2, magnetic gaps 3a and 3b, a guide spacer 7, a reed switch 4 and a lead frame 5. The temperature switch element is formed by molding with a molding resin.

A guide spacer 7 having an outer diameter larger than that of the permanent magnet 1a is provided on the end surface of the permanent magnet 1a on the side opposite to the lead-out side of the lead frame 5 of the temperature switch element used in the sealed mold type temperature switch 4. ing.

Since the vertical and horizontal swings during molding are minimized, the permanent magnets 1a, 1b, the temperature-sensitive magnetic body 2,
The magnetic gap spacers 3a and 3b are not exposed on the resin surface, and the minimum distance can be maintained.

Even if the guide spacer 7 is exposed, since it is made of the same material as the molding resin, the insulation between the lead frame and the lead frame is ensured, and no abnormality is observed in appearance.

[0018]

As described above, according to the present invention, by disposing the guide spacer on the end surface of the permanent magnet on the side opposite to the lead-out side of the lead frame, the positional shift of the temperature switch element during molding can be prevented. It is possible to provide a sealed mold type temperature switch that is stable in appearance and that secures the resin thickness and insulation characteristics between the temperature switch element and the mounting surface.

[Brief description of drawings]

FIG. 1 is an explanatory view of a sealing mold type temperature switch according to the present invention. FIG. 1A is a plan view. FIG.1 (b) is a front view.

FIG. 2 is an explanatory diagram of a temperature switch element used in the sealed mold type temperature switch according to the present invention. FIG. 2A is a plan view. FIG. 2B is a front view.

FIG. 3 is a perspective view of a conventional sealed mold type temperature switch.

FIG. 4 is a perspective view of a temperature switch element used in a conventional sealed mold temperature switch.

[Explanation of symbols]

 1a, 1b Permanent magnet 2 Temperature-sensitive magnetic material 3a, 3b Magnetic gap spacer 4 Reed switch 4a, 4b Reed switch lead 5 Lead frame 6 Molding resin 7 Guide spacer 8 Signal lead

Claims (1)

[Claims] 1. A tubular body is formed by providing permanent magnets on both sides of an annular temperature-sensitive magnetic body via magnetic gap spacers,
Insert the reed switch into this tubular body, connect the lead of this reed switch to the lead for signal lead-out of the lead frame, lead out the lead for signal lead-out of the lead frame in the same direction, and use the insulating resin for the temperature switch element. In the sealed mold type temperature switch formed by sealing and molding, the end surface of the permanent magnet on the side opposite to the side having the signal lead-out lead of the lead frame of the temperature switch element is Sealing mold type temperature switch characterized in that a guide spacer made of the same material as the molding resin is provided.