JP2845503B2 - Fixed resistor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a fixed resistor.

2. Description of the Related Art As shown in FIG. 2A, a conventional fixed resistor comprises a resistor element in which a lead conductor 3 is welded to a metal cap 2 press-fitted at both ends of a resistor 1, and a lead conductor is drawn at both ends by opening the upper surface. Exit
In a fixed resistor inserted into a cement case 4 as an insulating case having 4a and filled with cement 5,
The cement case 4 and the resistor element need to have a certain size in order to obtain the rated power of the fixed resistor.
I was using a thin 2mm one.

However, in the conventional configuration, as shown in FIG. 3, there is a difference of 2 to 5 mm between the internal length L of the cement case 4 in the longitudinal direction and the total length l of the resistor element. , The resistor element is shifted and inserted into the cement case 4,
As a result, there is a difference of 5 mm between the left and right lengths of the lead conductor 3 from the outside of the cement case 4. For this reason, when taping and packaging the fixed resistor, the length of the lead conductor 3 applied to the tape becomes longer on one side, and a cutting step of the lead conductor 3 is required in a later step. On the other hand, the length of the lead conductor 3 applied to the tape was shortened, and the holding force of the tape became weak.

Further, when the paste-like cement was filled, since the inner thickness of the lead conductor outlet 4a was small, the protrusion 6 of the cement 5 was generated as shown in FIG.

Due to the above two problems, inconvenience occurs when taping this fixed resistor. That is, if the length of the left and right lead conductors is different, taping is impossible, or if the overhang 6 of the cement is large, the taping is restricted by the overhang 6 of the cement during taping, making it difficult to position correctly. Was not possible.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a fixed resistor in which a predetermined fixed resistor can be manufactured and a predetermined correct taping can be performed.

Means for Solving the Problems To achieve the above object, the fixed resistor of the present invention is a resistor element having lead conductors drawn out from both ends of the resistor,
An insulating case for housing the resistor element, having an upper surface opened and having lead conductor outlets at both ends, and an inorganic insulator filled in a gap between the insulating case and the resistor element; A guide plate for forming the lead conductor outlet and for positioning the resistor element is provided on the inner wall at both ends of the insulating case so as to protrude toward the inside of the insulating case.

According to the above configuration, a resistor element having lead conductors drawn out from both ends of the resistor, an insulating case which is housed in the resistor element, has an open upper surface and has lead conductor outlets at both ends, And an inorganic insulator filled in a gap between the resistor element and a guide plate for forming the lead conductor outlet on the inner wall of both ends of the insulating case and positioning the resistor element. Because it is provided so as to protrude toward the inside of the case, when the resistor element is stored in the insulating case, due to the presence of the guide plate,
It is possible to fit the resistor element in a predetermined position in the insulating case without inserting the resistor element in the insulating case side by side, and as a result, the length of the lead conductor drawn out on both sides of the insulating case. Are approximately equal, so that accurate taping can be realized. Further, even when the gap between the insulating case and the resistor element is filled with the inorganic insulator, the presence of the guide plate prevents the inorganic insulator from protruding from the lead conductor outlet, so that the fixed resistor is fixed in a predetermined arrangement. Are arranged side by side to enable predetermined correct taping.
Further, since the guide plate serves to increase the distance of the lead conductor outlet between the inside and the outside of the insulating case, the insulator filled in the insulating case is made of inorganic insulating material.
Even if it is of a kind, the inorganic insulating material has a special effect that it does not protrude outside the insulating case.

Embodiment An embodiment of the present invention will be described below with reference to the drawing of FIG. In FIG. 1, the same portions as those shown in FIGS. 2 to 4 are denoted by the same reference numerals.

1a and 1b show a fixed resistor according to an embodiment of the present invention. FIG. 1a is a cross-sectional view as viewed from a lateral direction, and FIG. 1b is a cross-sectional view as viewed from above. Reference numeral 7 denotes a cement case, which is an insulating case in which a resistor element is accommodated, and has a structure in which an upper surface is opened and lead conductor outlets 9 are provided at both ends. Reference numeral 8 denotes a guide plate which is provided on the inner walls at both ends of the cement case 7 so as to form lead conductor outlets 9 and protrudes toward the inside of the cement case 7. The guide plate 8 is set so that the clearance between the resistor element inserted in the cement case 7 and the guide plate 8 in the guide plate longitudinal direction is 2 mm or less.

In the fixed resistor configured as described above, the offset of the resistor element in the cement case 7 is reduced, and as a result, the difference between the left and right lengths of the lead conductor 3 from the outside of the cement case 7 is Pressed within 2mm. Further, the cement 5 does not protrude from the lead conductor outlet 9 when the paste-like cement 5 which is an inorganic insulator is filled.

In addition, in the said Example, although the plate-shaped guide plate 8 was described in the Example in order to obtain an inexpensive cement case,
Guide plate 8 depending on ease of making and use of cement case
The same operation and effect as those of the above embodiment can be obtained even if the shape of R is a triangle or a quadrangle when viewed from above, or a shape obtained by adding an R shape or a C shape. .

As described above, according to this embodiment, the following effects can be obtained by installing the guide plate 8 forming the lead conductor outlet 9 of the cement case 7 of the fixed resistor so as to protrude toward the inside of the cement case 7. Is obtained.

(1) Eliminating the bias of the resistor element in the cement case eliminates variations in the left and right lengths of the lead conductors from the outside of the cement case.

(2) The cement does not protrude from the lead conductor outlet of the cement case.

 Further, the following effects can be obtained.

(3) The step of cutting the lead conductor after taping and packaging the fixed resistor can be omitted, and the variation in the length of the lead conductor applied to the tape is reduced, and the variation in the holding force of the tape is reduced.

(4) Since the protrusion of the cement is eliminated, the protrusion is not restricted by the protrusion of the cement, so that the predetermined arrangement can be performed and accurate taping can be realized.

Effect of the Invention As described above, the fixed resistor according to the present invention includes a resistor element having lead conductors drawn out from both ends of the resistor, and a housing for accommodating the resistor element, and opening the upper surface and forming lead conductor outlets at both ends. An insulating case having an inorganic insulating material filled in a gap between the insulating case and the resistor element, wherein the lead conductor outlets are formed on inner walls at both ends of the insulating case, and the resistor element is formed. Since the guide plate for positioning is provided so as to protrude toward the inside of the insulating case, when the resistor element is stored in the insulating case, the resistor element is biased in the insulating case due to the presence of the guide plate. Without inserting, the resistor element can be stored at a predetermined position in the insulating case, and as a result, the lengths of the lead conductors drawn out on both sides of the insulating case become substantially equal, so that accurate Taping can be realized. Further, even when the gap between the insulating case and the resistor element is filled with the inorganic insulator, the presence of the guide plate prevents the inorganic insulator from protruding from the lead conductor outlet, so that the fixed resistor is fixed in a predetermined arrangement. Are arranged side by side to enable predetermined correct taping. Further, since the guide plate serves to increase the distance of the lead conductor outlet between the inside and the outside of the insulating case, even if the insulator filled in the insulating case is one kind of inorganic insulator. This has a special effect that the inorganic insulator does not protrude outside the insulating case.

[Brief description of the drawings]

1a and 1b are a side sectional view and a top sectional view showing an embodiment of a fixed resistor according to the present invention, and FIGS. 2a and 2b are a front view and a perspective view showing a conventional resistor element and a cement case. FIG. 3 is a top cross-sectional view showing a state in which a resistor element is offset in a conventional cement case, and FIG. 4 is a perspective view showing a state in which the conventional problem of cement has protruded. 1 ... resistor, 3 ... lead conductor, 5 ... filled cement, 7 ... cement case, 8 ... guide plate, 9 ...
... Lead conductor outlet.

Claims (1)

(57) [Claims] 1. A resistor element having lead conductors drawn out from both ends of a resistor, an insulating case for accommodating the resistor element, having an open upper surface and having lead conductor outlets at both ends, and an insulating case and a resistor. A guide plate for forming the lead conductor outlets on the inner walls of both ends of the insulating case and positioning the resistor element on the inner wall of the insulating case. A fixed resistor that protrudes inward.