JP2514963Y2 - Fuse with diode - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a fuse with a diode for use in automobiles, electronic devices and the like.

[Problems of conventional technology and device]

Generally, a fuse protects an electronic device or the like from an overcurrent by melting itself due to Joule heat generated by the overcurrent when the overcurrent flows. Specifically, the fusing part is formed of a substance having a low fusing temperature, and the part is further thinned to facilitate fusing.

By the way, since the conventional fuse does not have a reverse current preventing function, the electronic device can be protected from an overcurrent, but the reverse current cannot be prevented. Therefore, in the case where the reverse current causes trouble to the device, it is necessary to provide a rectifier in the circuit to prevent the reverse current.

However, there is a strong demand for downsizing of electronic devices in recent years, and in order to achieve this, it is necessary to reduce the number of parts as much as possible to simplify or downsize. Therefore, it is not preferable to install the rectifier or the like in the circuit.

Therefore, conventionally, in Japanese Utility Model Application Laid-Open No. 61-102058, Japanese Utility Model Application Laid-Open No. 62-183379, etc., fuses in which a diode element is provided in a part of a current path are disclosed. This fuse blocks a reverse current due to the directivity of the diode element with respect to the current.

However, these conventional fuses are not provided with means for preventing erroneous mounting when they are mounted in sockets, so if they are erroneously mounted, normal current will not flow and the electronic device or the like will not operate.

Therefore, an object of this invention is to prevent overcurrent and reverse current at the same time without erroneous mounting.

[Means for solving the problem]

In order to solve the above problems, in the present invention, in the fuse with a diode element described above, terminal pieces are provided at both ends of the current path, and one terminal piece is provided with a protrusion in the socket of the terminal piece. This is because a notch that engages is formed.

[Action]

In the fuse with diode according to the present invention having such a configuration, if the socket is erroneously mounted, the protrusion does not engage with the notch, and the erroneous mounting can be confirmed. For this reason, the fuse is always installed in the socket with the notch engaged with the protrusion in the correct state.In that state, the fuse operates in the same manner as the conventional one against the forward current of the diode to prevent overcurrent and reverse The diode blocks the directional current, ie the reverse current.

〔Example〕

 Hereinafter, embodiments will be described with reference to the drawings.

The embodiment shown in FIGS. 1 and 2 has a pair of terminal pieces 11
Connect a and 11b with an elongated fusing part 12 made of low melting metal,
This is mold-coated with resin 13, and a diode element 14 is provided on one terminal piece 11a.
Therefore, when an overcurrent flows in the forward direction of the diode element 14, the fusing part 12 blows to cut off the circuit, and a current in the reverse direction is blocked by the diode element 14.

As shown in FIG. 3, the diode element 14 has its lead wire 14a fitted in the notch 15 of the one terminal piece 11a, and its joint portion is soldered. Further, the other terminal piece 11b is formed with a notch 16 at its end portion, and is engaged with a protrusion of a mounting portion (socket) of the fuse to prevent erroneous mounting.

The diode element 14 can be directly provided in the fusing part 12, as shown in FIG.

In the above embodiment, the diode element 14 has terminals at both ends thereof, but in the case of having terminals on the front and back sides, as shown in FIGS. 5 (a) and 5 (b), it is divided into upper and lower parts. It can be sandwiched between the terminal pieces 11a formed, or can be sandwiched by newly providing an auxiliary piece 11c as shown in FIG. 5 (c).

〔effect〕

Since the present invention is configured as described above, overcurrent and reverse current are surely prevented without being erroneously mounted. Therefore, it is effective when used as a fuse for automobiles with complicated wiring.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment according to the present invention, FIG. 2 is a circuit diagram of the same as above, FIG. 3 is an enlarged perspective view of the same main portion, and FIGS. 4 and 5 show other embodiments. FIG. 11a, 11b …… Terminal piece, 11c …… Auxiliary piece, 12 …… Fusing part, 1
3 ... Resin, 14 ... Diode element, 14a ... Lead wire,
15 …… notches, 16 …… notches.

Claims (1)

(57) [Scope of utility model registration request] 1. A fuse with a diode in which a diode element 14 is provided in a part of a current path, wherein terminal pieces 11a and 11b are provided at both ends of the current path, and one terminal is provided.
A fuse with a diode characterized in that a cutout (16) that engages with a protrusion in the socket of the terminal piece (11b) is formed in the fuse (11b).