JPH0531086U - Fuse display circuit - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a fuse that can easily recognize whether it is in a blown state or a normal state. [Composition] A connection terminal (Ta, Tb) is connected to a fuse element (1), and the fuse element (1) and a part of the connection terminal (Ta, Tb) are housed in a housing case, or made of resin. In the fuse molded in (2), the light emitting means (3) which emits light when the fuse element is blown is connected to the connection terminals (Ta, Tb).

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a fuse disconnection display circuit that can quickly find a fuse blown by an overcurrent, and is particularly useful when used in an automobile or the like.

[0002]

[Prior Art]

 For example, even in passenger cars, fuses are provided in major parts in order to protect various circuits and devices from overcurrent. Most of these fuses are of the mold type as shown in Fig. 1, unlike the fuses of home appliances. The fuse shown in FIG. 1 has a structure in which a fuse element 1 is attached to the connection terminals Ta and Tb, and the fuse element 1 and a part of the terminals Ta and Tb are molded with a transparent synthetic resin 2. .

[0003]

[Problems to be solved by the device]

 In general, the fuses are generally arranged collectively in any part of the instrument panel in the vehicle compartment or in the engine room. If for some reason the equipment has stopped working at all, the fuse that protects the equipment must be suspected of being blown out. Therefore, it is not easy to visually identify which fuse has blown, and the current situation is to search for it using a disconnection detector. In particular, when such a situation occurs in the evening or at night, the disconnection detector cannot be used, and the recognition becomes even more difficult.

The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide a fuse disconnection display circuit capable of easily recognizing a blown fuse.

[0005]

[Means for Solving the Problems]

 The present invention for attaining the above object provides a fuse in which a connection terminal is connected to a fuse element and the fuse element and a part of the connection terminal are housed in a housing case, or a fuse molded with a resin, A light emitting means which emits light when the fuse element is blown is connected to the connection terminal.

[0006]

[Action]

 In the present invention, since the above-mentioned configuration is adopted, when the fuse is blown, the light emitting means emits light. This makes it easy to visually recognize whether the fuse has blown.

[0007]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. FIG. 2 is a schematic configuration diagram of a fuse including a fuse disconnection display circuit according to the present invention. As shown in the figure, in addition to the conventional structure, this fuse has a series connection circuit of a resistor R and a light emitting diode LED constituting the light emitting means 3 connected to the connection terminals Ta and Tb. It is configured to be. That is, the fuse element 1 and the light emitting means 3 are attached to the connection terminals Ta and Tb, and the fuse element 1 and the light emitting means 3 and a part of the terminals Ta and Tb are molded by the transparent synthetic resin 2 '. ing. The resistance value of the resistor R constituting the light emitting means should be as large as possible. This is because the current flowing through the light emitting means when the fuse element 1 is blown is made as small as possible so that the inflow current of the circuit in which the failure occurs is close to zero.

The fuse having such a structure operates as follows. First, in a normal time when the fuse element 1 is not blown, the impedance of the light emitting means is so large that almost all the current flowing through the circuit flows through the fuse element 1. On the other hand, if an abnormality occurs in this circuit and an overcurrent flows, the fuse element 1 will automatically blow. As a result, this time, a current flows in this circuit through the series connection circuit of the resistor R and the light emitting diode LED which constitute the light emitting means 3. Therefore, the light emitting diode LED is turned on.

As described above, when the fuse element 1 is in a blown state, the light emitting diode LED is turned on, so that a large number of fuses are arranged at one place like a passenger car. It will be very easy to check for blown fuses in the fuse box. Although the light emitting diode LED is illustrated as the light emitting means in the above embodiments, the present invention is not limited to this, and a lamp may be used.

[0010]

[Effect of the device]

 As described above, according to the fuse disconnection display circuit of the present invention, the light emitting means emits light when the fuse element is blown. It is possible to easily recognize whether or not it is in a fused state.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a general fuse.

FIG. 2 is a schematic configuration diagram of a fuse including a fuse disconnection display circuit according to the present invention.

[Explanation of symbols]

 1: Fuse element 2, 2 ': Transparent synthetic resin 3: Light emitting means 4: Conductor R: Resistor LED: Light emitting diode Ta, Tb: Connection terminal

Claims (2)

[Scope of utility model registration request] 1. A connection terminal (Ta, Tb) is connected to a fuse element (1), and the fuse element (1) and a part of the connection terminal (Ta, Tb) are housed in a housing case. Alternatively, in a fuse molded with a resin (2), a light emitting means (3) which emits light when the fuse element is blown is connected to the connection terminal (Ta, Tb), and a fuse disconnection display circuit. 2. A fuse disconnection display circuit, wherein the light emitting means is a light emitting diode connected to a resistor or a lamp.