JP2005005473A - Hall element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To switch input and output in terms of time, to correct unbalance voltage, and to improve an SN ratio for a wide temperature range. <P>SOLUTION: Electrodes 2, a Hall element chip 5 and metal wires 3 connecting one end of the electrodes 2 with pads 4 of the Hall element chip 5 are arranged on a substrate 1. An objective Hall element 6 where an input terminal and an output terminal have the same shapes and input and output are not discriminated is disposed in the center of the Hall element chip 5. An electric route of input or output of the Hall element 6 is installed in an oblique angle with respect to a longitudinal direction of the substrate 1. The other ends of the electrodes 2 are connected to an outer part in the end of one side of the substrate 1, and they are linearly arranged in the longitudinal direction of the substrate 1. In vertical and lateral lengths of mold resin 7, it is desirable that one (lateral length) is three times to 30 times of the other (vertical length). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a Hall element, and more specifically, allows an unbalanced voltage to be calibrated by temporally switching between an input and an output without any distinction between the input and the output, and an SN ratio in a wide temperature range. The present invention relates to a Hall element in which is increased.
[0002]
[Prior art]
In recent years, a technique has been proposed in which noise such as an unbalanced voltage is calibrated while temporally switching between input and output (see, for example, Patent Document 1). This proposal relates to a chop Hall sensor, which alternately switches the excitation current of the Hall element from a flow in one direction to a flow in another direction, and synchronizes the chop sample and hold circuit with the switched Hall sensor. This is a Hall sensor that is clocked automatically.
[0003]
3A and 3B are diagrams for explaining a conventional Hall element, in which FIG. 3A is a plan view and FIG. 3B is a side view. In the figure, reference numeral 21 denotes a base material, 22 denotes an electrode, 23 denotes a gold wire, 24 denotes a pad, 25 denotes a Hall element chip, 26 denotes a Hall element, and 27 denotes a molding resin.
[0004]
The conventional Hall element has an electrode 22 having one end connected to the pad 24 provided on the Hall element chip 25 and the other end connected to the outside on the substrate 21, and one end of the electrode 22 and the pad. In this structure, a Hall element chip 25 to be connected via 24 and a gold wire 23 for connecting one end of the electrode 22 to the pad 24 are provided. In the central portion of the Hall element chip 25, a target Hall element 26 having the same input terminal and output terminal and having no distinction between input and output is provided, and the other end of the electrode 22 has two opposite sides of the substrate 21. It is designed to be connected to the outside at the end. In addition, the input or output electrical path of the Hall element 26 is arranged in parallel with each side of the base material 1, and the surface of the Hall element chip 25 and the gold ear 23 are covered with a mold resin 27. .
[0005]
In this way, the other end of the electrode 22 is connected to the outside at the two opposite ends of the base material 21. With this structure, the ratio of the length and width of the mold resin 27 is large. There was no need to increase the size. Therefore, there has been no mold resin 27 having a ratio of vertical and horizontal sizes larger than 2 so far.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 9-196699 [0007]
[Problems to be solved by the invention]
However, in recent years, Hall elements having mold resins with greatly different vertical and horizontal lengths, such as by arranging the external terminals of the electrodes provided on the base material in a straight line, have been manufactured with a structure that particularly stands the magnetic sensing portion. In this case, it was found that the temperature characteristics of the resistance and the unbalanced voltage are greatly different in the Hall element when the input and the output are switched. For this reason, it has been difficult to calibrate noise such as unbalanced voltage over a wide temperature range.
[0008]
As a result of analyzing these problems, it was found that the stress applied to input and output is different. That is, it was found that when the vertical and horizontal sizes differ greatly, the stress generated in the vertical and horizontal directions differs depending on the temperature, so that the electrical characteristics also changed differently.
[0009]
The present invention has been made in view of such a problem. The object of the present invention is to calibrate the unbalanced voltage by switching the input and the output temporally without completely distinguishing the input and the output. It is another object of the present invention to provide a Hall element in which the S / N ratio is increased over a wide temperature range.
[0010]
[Means for Solving the Problems]
The present invention has been made to achieve such an object. The invention according to claim 1 is an object type in which the input terminal and the output terminal have the same shape and do not distinguish between input and output on the base material. In the Hall element formed by providing a Hall element chip having a Hall element, providing an electrode for electrically connecting the outside and a pad provided on the Hall element chip, and covering the surface of the Hall element chip with a mold resin, The length and the horizontal length of the mold resin are 3 times or more and 30 times or less compared to one, and the input or output electrical path of the Hall element is oblique with respect to the longitudinal direction of the substrate. It is characterized by being arranged at an angle.
[0011]
The invention according to claim 2 is the invention according to claim 1, characterized in that the oblique angle is arranged in a range of 40 degrees to 50 degrees.
[0012]
The invention described in claim 3 is characterized in that, in the invention described in claim 1 or 2, the connection ends of the electrodes to the outside are arranged linearly in the longitudinal direction of the base material. .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIGS. 1A and 1B are views for explaining an embodiment of the Hall element of the present invention. FIG. 1A is a plan view and FIG. 1B is a side view. In the figure, reference numeral 1 is a base material, 2 is an electrode, 3 is a gold wire, 4 is a pad, 5 is a Hall element chip, 6 is a Hall element, and 7 is a mold resin.
[0014]
The Hall element of the present invention has a structure in which an electrode 2, a Hall element chip 5, and a gold wire 3 that connects the electrode 2 and the Hall element chip 5 are provided on a substrate 1. The electrode 2 has one end connected to the pads 4 provided at the four corners of the Hall element chip 5 and the other end connected to the outside. The Hall element chip 5 is provided with pads 4 connected to one end of the electrode 2 via the gold wire 3 at the four corners, and the input terminal and the output terminal have the same shape and input / output at the center. An indistinguishable target Hall element 6 is provided. The input or output electrical path of the Hall element 6 is arranged on the Hall element chip 5 at an oblique angle with respect to the longitudinal direction of the base material 1.
[0015]
The other end of the electrode 2 is connected to the outside at one end of the base 1 and is arranged in a straight line in the longitudinal direction of the base 1. The surface and the gold ear 3 are covered with a mold resin 7. The length and width of the mold resin 7 are desirably 3 times or more and 30 times or less in the other (horizontal) as compared with one (vertical).
[0016]
In FIG. 1, the ratio (b / a) between the length a and the width b of the mold resin 7 is about 3 times. The input / output pattern of the Hall element 6 is disposed obliquely with respect to the base material 1 from the longitudinal direction.
[0017]
With this configuration, the stress works equally between the input and output, and the temperature characteristics due to the stress are aligned with the input and output over a wide temperature range. In this case, the oblique angle is preferably 45 degrees, and the effect is sufficiently exhibited if it is in the range of 40 degrees to 50 degrees. The substrate 1 may be a lead frame, a printed wiring board, a ceramic wiring board, or the like. However, when a printed wiring board is used, the effect is further increased.
[0018]
When the lengths a and b of the mold resin 7 are 30 times or more, the warpage of the package becomes large, and soldering mounting such as reflow is difficult. Therefore, in the present invention, the length is 30 times or less. .
[0019]
The mold method may be screen printing or transfer molding. The material of the mold resin may be epoxy or acrylic, but epoxy resin is preferable from the viewpoint of reliability. Further, the base 1 and the Hall element chip 5 can be fixed using a silver paste or an epoxy adhesive, but is not particularly concerned with the bonding method.
[0020]
FIG. 2 is a view for explaining another embodiment of the Hall element of the present invention. Since it has the same function as FIG. 1, the same reference numerals are given to the components. The difference from the embodiment of FIG. 1 is that the arrangement of the Hall element chip 5 with respect to the substrate 1 is different. That is, in FIG. 1, the side of the Hall element chip 5 is arranged in parallel to the side of the base material 1, whereas the Hall element chip 5 in FIG. Are inclined at an angle of approximately 45 degrees.
[0021]
Also, the electrical path of the input or output of the hall element 6 is arranged at an oblique angle with respect to the longitudinal direction of the substrate 1 as in FIG.
[0022]
【The invention's effect】
As described above, according to the present invention, the length and width of the mold resin are 3 times or more and 30 times or less on the other side, and the input or output electrical path of the Hall element is based on the basic length. Since it is arranged at an oblique angle with respect to the longitudinal direction of the material, it is possible to calibrate the unbalanced voltage by switching the input and output in time without completely distinguishing between input and output, In addition, the SN ratio can be increased over a wide temperature range.
[Brief description of the drawings]
1A and 1B are diagrams for explaining an embodiment of a Hall element of the present invention, in which FIG. 1A is a plan view and FIG. 1B is a side view.
FIG. 2 is a view for explaining another embodiment of the Hall element of the present invention.
3A and 3B are diagrams for explaining a conventional Hall element, in which FIG. 3A is a plan view and FIG. 3B is a side view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Base material 2 Electrode 3 Gold wire 4 Pad 5 Hall element chip 6 Hall element 7 Mold resin

Claims (3)

Provided on the base material is a Hall element chip having a target Hall element having the same shape of input terminal and output terminal and having no distinction between input and output, and electrically connecting the outside and the pad provided on the Hall element chip In the Hall element formed by providing an electrode to be connected and covering the surface of the Hall element chip with a mold resin,
The length and the horizontal length of the mold resin are 3 times or more and 30 times or less compared to one, and the input or output electrical path of the Hall element is oblique with respect to the longitudinal direction of the substrate. Hall element arranged at an angle. The Hall element according to claim 1, wherein the oblique angle is arranged in a range of 40 degrees to 50 degrees. 3. The Hall element according to claim 1, wherein connection ends of the electrodes to the outside are arranged linearly in the longitudinal direction of the base material.

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