JPH10299534A - Rotation sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set the distance between a Hall IC and a rotor to the shortest distance, and improve detecting accuracy by arranging, along the bottom part of a case, a main body part formed in such a constitution that a lead end part of the Hall IC abuts on a land on a wiring substance, the lead part is held along the end part of the wiring substrate, and the main body part is formed as the positioning detecting part of the Hall IC. SOLUTION: A rotary sensor is formed in such a constitution that a connector 10 providing with a tongue piece shaped fixing part 12 for installing a hybrid IC 30 on which a Hall IC 32 provided with a terminal 12 and a wave forming IC 34 are mounted, is covered with a case 50. In the Hall IC 32, the center vicinity of the lead part is held at right angles along the end part of the wiring substrate, and the end part of the lead part abuts on a land provided in the vicinity of the end part of the wiring substrate, and soldering is carried out. The lead end part of the Hall IC 32 is installed by means of soldering on the land formed in the vicinity of one end part of the wiring substrate on which the hybrid IC 30 is formed, and the main body of the Hall IC 32 is arranged near the bottom surface of a case along the bottom surface of the case 50 by bending the center vicinity of the lead part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation sensor for detecting the position of a crank angle and a cam angle used in an internal combustion engine, and more particularly to a means for mounting a sensor portion.

[0002]

2. Description of the Related Art Heretofore, there has been known a rotation sensor for an internal combustion engine which detects a position of a crank angle and a cam angle by using a Hall IC utilizing a Hall effect. That is, conventionally, a Hall IC that generates an electric signal according to a rotation angle of a crank angle or a cam angle of an internal combustion engine.
There is known a hybrid IC in which a waveform shaping IC for shaping a waveform of the electric signal is configured as a hybrid (integrated), and the output of the hybrid IC is used to control an internal combustion engine.

FIG. 2 is a sectional side view of a rotation sensor having the above-described hybrid IC. As shown in FIG. 2, the rotation sensor is formed by covering a connector 10 having a terminal 12 with a case 50. More specifically, the connector 10 has a hybrid IC mounted with a Hall IC 32 and a waveform shaping IC 34.
It has a tongue-shaped fixing portion 14 to which the IC 30 is attached. The output portion of the hybrid IC 30 and the terminal 12 are connected by wire bonding or the like.

[0004] The case 50 has a hollow interior and is open on one side only. The fixing portion 14 of the connector 10 and the hybrid IC 30 are inserted and fixed through the opening. Reference numeral 40 is a magnet for a rotation sensor.
Here, the mounting means of the Hall IC 32 to the conventional hybrid IC 30 will be described.A component hole 36 for component insertion is provided on a commonly used wiring board, a lead portion of the Hall IC 32 is inserted therein, and fixing by soldering. Electrical conduction is performed, and the main body of the Hall IC 32 is fixed to the fixing portion 14 with an adhesive. In such an electric component, the distance from the component hole 36 to the end face of the wiring board must be at least twice the diameter of the component hole 36 in consideration of the strength of the wiring board when the component is mounted. Case 50
The distance between the IC and the Hall IC 32 must be at least "L" or more.

In the above configuration, the Hall IC 32 is disposed directly near the bottom of the metal case 50, picks up a signal change due to the passage of the projection of the rotating body 20, and sends this signal to the waveform shaping IC 34. Is sent to an external processing unit (not shown) via a terminal 12.

[0006]

However, in the rotation sensor having the above-mentioned structure, in order to maintain the strength of the wiring board constituting the hybrid IC 30, a predetermined distance "L" from the component hole 36 is required.
Must be taken, but the actual rotation sensor
The shorter the distance between the IC 32 and the rotating body 20 (the bottom surface of the case 50), the more accurate detection results can be obtained. That is, in the conventional rotation sensor, there is a problem that the position detection accuracy of the rotation sensor is deteriorated due to a useless wiring substrate space which is provided only for maintaining the strength of the wiring substrate.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a rotation sensor which minimizes the distance between a Hall IC and a rotating body and has excellent detection accuracy.

[0008]

According to the present invention, there is provided a rotation sensor comprising a connector, a wiring board on which a Hall IC is mounted, and a case. Abuts the land on the wiring board,
The lead portion is bent along the end of the wiring board,
A rotation sensor is characterized in that a main body serving as a position detection unit of the Hall IC is arranged along a portion near the bottom surface of the case.

[0009]

An embodiment of the present invention will be described with reference to FIG. In FIG. 1, the rotation sensor is formed by covering a connector 10 having a terminal 12 with a case 50. More specifically, the connector 10 includes a Hall IC 32 and a waveform shaping IC 34.
The hybrid IC 30 has a tongue-shaped fixing portion 14 for mounting the hybrid IC 30.
12 is connected by wire bonding or the like.

[0010] The case 50 has a hollow interior, and has a shape in which only one surface is opened. The fixing portion 14 of the connector 10 and the hybrid IC 30 are inserted and fixed through the opening. Reference numeral 40 is a magnet for a rotation sensor. In such a configuration, the Hall IC 32 is directly disposed near the bottom surface of the metal case 50, picks up a signal change due to the passage of the protrusion of the rotating body 20, and sends this signal to the waveform shaping IC 34.
The processing result is sent to an external processing unit (not shown) via the terminal 12.

Next, the Hall IC to the hybrid IC 30
32 attachment means will be described. The Hall IC 32 bends the vicinity of the center of the lead portion at a right angle along the edge of the wiring board, and makes the end of the lead abut on a component arrangement position (land) on the wiring board to perform soldering. . Also,
The land of the lead portion of the Hall IC 30 is provided near the end of the wiring board. Therefore, the end of the lead portion of the Hall IC 32 is attached by soldering to a land near one end of the wiring board forming the hybrid IC 30, and along the bottom of the case 50 by bending near the center of the lead portion,
The main body of the Hall IC 32 is arranged close to the bottom of the case.

In the above configuration, the land of the Hall IC 32 is provided near the end of the wiring board forming the hybrid IC 30, but in the present invention, the main body of the Hall IC 32 is close to the bottom of the case 50 so as to be along the bottom surface of the case 50. Since the land may be provided, the position of the land does not necessarily have to be provided at the end as described above.

[0013]

According to the above configuration, a useless wiring board space only for securing the strength of the wiring board can be omitted, and the distance between the rotating body 20 and the Hall IC 32 can be minimized. Can be provided. In addition, the rotation sensor itself can be downsized.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a rotation sensor according to an embodiment of the present invention.

FIG. 2 is a side sectional view of a conventional rotation sensor.

[Explanation of symbols]

 In the drawings, the same reference numerals indicate the same or corresponding parts. DESCRIPTION OF SYMBOLS 10 Connector 12 Terminal 14 Fixed part 18 Spacer part 20 Rotating body 30 Hybrid IC 32 Hall IC 34 Waveform shaping IC 36 Component hole 40 Magnet 50 Case

Claims (1)

[Claims] In a rotation sensor comprising a connector, a wiring board on which a Hall IC is mounted, and a case, an end of a lead portion of the Hall IC comes into contact with a land on the wiring board, and the lead portion is connected to the wiring board. A rotation sensor, which is bent along an end of the case, and a main body serving as a position detection unit of the Hall IC is disposed along a portion close to a bottom surface of the case.