JPH0633859A - Revolution crank angle detection device - Google Patents

Abstract

PURPOSE:To obtain a revolution crank angle detection device which can reduce the dimensions of a module and improve the noise generation. CONSTITUTION:In the first accommodation chamber 12 of a housing 5, a light receiving element 4 and a circuit base board 7 are arranged, keeping a prescribed gap in the vertical direction. Further, the lead terminal of the light receiving element 4 is subjected to parallel-gap-weld to one edge of an insertion electrode 14. Further, the lead frame 8 of the circuit base board 7 is parallel- gap-welded at the other edge of the insertion electrode 14. The light receiving element 4 is adherently fixed to the housing 5, and a cover 9 is installed, and the second accommodation chamber 12 is perfectly sealed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary crank angle detecting device for detecting a rotary angle of an engine crankshaft.

[0002]

2. Description of the Related Art Conventionally, control of ignition timing of an engine is performed by detecting a rotation angle of a crankshaft. This kind of rotary crank angle detection device is a device attached to the engine, and because it is used in a harsh environment where electromagnetic noise and harmful gas are generated and heat shock at high temperature and low temperature is applied, noise resistance and resistance Gas resistance and heat shock resistance are required.

FIG. 4 is a sectional view showing an example of a conventional rotary crank angle detecting device. In the figure, 1 is a distributor shaft that rotates in synchronization with a camshaft, and 2 is a shaft 1.
The disk 2a fixed to the disk 2 is a slit provided on the outer peripheral portion of the disk 2. Reference numeral 5 denotes a housing. The housing 5 is incorporated in a power distributor, and holds the light emitting element 3 and the light receiving element 4 facing each other with the disk 2 interposed therebetween. 6
Is an insert electrode provided in the housing 5 for electrically connecting the light receiving element 4 and the circuit board 7 for waveform-processing the output signal of the light receiving element 4, and 8 is a lead for electrically connecting the circuit board 7 and an external terminal. The frames 9, 10 and 11 are covers.

In the rotary crank angle detecting device, the circuit board 7 is attached to the housing 5, and the light emitting element 3 and the light receiving element 4 are adhesively fixed to the housing 5.
After that, it is configured to be hermetically sealed by the covers 9, 10 and 11, and has a structure in which circuit elements, terminals and the like are shielded from harmful gas.

Further, the light emitting element 3 and the light receiving element 4 are electrically connected to the circuit board 7 through the insert electrode 6, and even if a heat shock is applied, the light emitting element 3 and the light receiving element are received by using the through holes. It is possible to suppress the occurrence of solder cracks which are caused by stress stress concentrated on the joint portion when the element 4 and the circuit board 7 are directly connected.

Next, the operation of the conventional rotary crank angle detecting device will be described. When the shaft 1 rotates in synchronization with the cam shaft, the disc 2 rotates. With the rotation of the disk 2, the slit 2a passes between the light-emitting element 3 and the light-receiving element 4 which are arranged to face each other,
The light emitted from the light emitting element 3 is blocked / passed. Light receiving element 4
Then, the light emitted from the light emitting element 3 is received and output to the circuit board 7 via the insert electrode 6. In the circuit board 7,
The output of the light receiving element 4 is waveform-shaped by the comparator to convert the impedance, and the pulse signal is output to the external terminal via the lead frame 8.

Further, the camshaft rotates at a predetermined ratio with respect to the rotation of the crankshaft, and by counting this pulse signal, the crank angle can be detected and the ignition timing of the engine can be controlled.

[0008]

As described above, in the conventional rotary crank angle detecting device, the light receiving element 4 and the circuit board 7 are arranged in the horizontal direction on substantially the same plane and are housed in separate housing chambers. Therefore, the package size becomes large in plan and the connection line between the light receiving element 4 and the circuit board 7 becomes long.

As a result, there are problems that the number of pallets taken per package is reduced, the cost is increased, and the module cannot be downsized. In addition, the output impedance of the light receiving element 4 is large, and the interior of the distributor is a noisy environment, and external noise is likely to be superposed on the connection line, resulting in a problem of reduced noise resistance.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a rotary crank angle detecting device which can reduce the size of a module and improve noise resistance. To do.

[0011]

A rotary crank angle detecting device according to the present invention is a rotary crank angle detecting device comprising a light emitting element, a light receiving element, and a circuit board for waveform processing in a housing. Are vertically arranged in the same sealed space, and one end of the insert electrode insert-molded in the housing is joined to the light receiving element and the other end is welded to the circuit board by parallel gap welding in the space.

[0012]

According to the present invention, since the light receiving element and the circuit board are arranged vertically in the same sealed space, the package size is reduced in plan and a large number of pallets can be taken during package fabrication. Therefore, the module is downsized. Further, the length of the insert electrode connecting the light receiving element and the circuit board is shortened, external noise is less likely to be superimposed, and noise resistance is enhanced. Further, since the insert electrode, the light receiving element, and the circuit board are parallel-gap welded, the height of the welded portion is reduced, and the overall height of the module is shortened.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a sectional view of a rotary crank angle detecting device showing an embodiment of the present invention, FIG. 2 is a bottom view of a rotary crank angle detecting device showing an embodiment of the present invention, and FIG. 3 is III-I of FIG.
FIG. 6 is a cross-sectional view taken along line II, in which the same or corresponding parts as those of the conventional rotary crank angle detecting device shown in FIG. In the figure,
Reference numeral 12 denotes a first storage chamber for storing the light receiving element 4 and the circuit board 7, 13 denotes a second storage chamber for storing the light emitting element 3, and 14
Is an insert electrode that connects the light receiving element 4 and the circuit board 7.

Now, the structure of the rotary crank angle detecting device according to the above embodiment will be described. First, a step portion is formed in the first storage chamber 12, the light receiving element 4 is adhesively fixed, the circuit board 7 is adhesively fixed to the step portion, and the light receiving element 4 and the circuit board 7 have a predetermined gap in the vertical direction. It is arranged. Further, the insert electrode 14 is insert-molded so that both ends thereof are located at substantially the same surface positions as the terminal surface of the light receiving element 4 and the input / output terminal surface of the circuit board 7. The lead terminal of the light receiving element 4 is bent in the horizontal direction, is parallel gap welded to one end of the insert electrode 14, and is electrically and mechanically connected. Further, the lead frame 8 of the circuit board 7 is welded to the other end of the insert electrode 14 by parallel gap welding, is electrically and mechanically connected, and the first storage chamber 12 is completely sealed by the cover 9. The lead frame 8 of the circuit board 7 is also parallel gap welded to the insert electrodes 6 such as external terminals.

On the other hand, the light emitting element 3 is adhesively fixed to the second storage chamber 13, the lead terminals of the light emitting element 3 are also parallel gap welded to the insert electrode 6, and the second storage chamber 13 is completely sealed by the cover 10. ing.

The operation of the above embodiment operates in the same manner as the conventional rotary crank angle detecting device.

As described above, according to the above-described embodiment, since the light receiving element 4 and the circuit board 7 are arranged vertically in the first storage chamber 12 sealed by the cover 9, the package size can be reduced. The size can be reduced in plan, the number of pallets taken per package can be increased, the cost can be reduced, the module can be downsized, and the layout of the engine can be improved.

Further, since the insert electrode 14 and the light receiving element 4 and the circuit board 7 are parallel-gap welded, the height of the welded portion is lowered, and the overall height of the module can be shortened.

Further, the length of the insert electrode 14 connecting the light receiving element 4 and the circuit board 7 is shortened, and it becomes difficult for external noise to be superposed on the insert electrode 14 and the noise resistance is enhanced.

Further, like the conventional rotary crank angle detecting device, since the light emitting element 3, the light receiving element 4, the circuit board 7, and the terminal portion are completely sealed, gas resistance is obtained and the light emitting element is obtained. 3 and light receiving element 4 and circuit board 7
Since and are electrically connected via the insert electrodes 6 and 14, heat shock resistance is obtained.

[0021]

As described above, according to the present invention, the light receiving element and the circuit board are vertically arranged in the same sealed space,
Since one end of the insert electrode insert-molded in the housing is welded to the light receiving element and the other end is welded to the circuit board in the parallel gap in the above space, the module can be downsized, the cost can be reduced, and the noise resistance can be improved. There is an effect that an excellent rotary crank angle detection device can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a rotary crank angle detection device showing an embodiment of the present invention.

FIG. 2 is a bottom view of the rotary crank angle detection device according to the embodiment of the present invention.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view showing an example of a conventional rotary crank angle detection device.

[Explanation of symbols]

 3 Light emitting element 4 Light receiving element 5 Housing 7 Circuit board 14 Insert electrode

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[Procedure amendment]

[Submission date] November 2, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art Conventionally, control of ignition timing of an engine is performed by detecting a rotation angle of a crankshaft. This type of rotary crank angle detection device is a device attached to the engine, because it is used in a harsh environment where electromagnetic noise, harmful gas are generated, and heat shock at high and low temperatures is applied. Noise resistance, gas resistance, and heat shock resistance are required.

Claims (1)

[Claims] 1. A rotary crank angle detecting device comprising a light emitting element, a light receiving element, and a circuit board for waveform processing in a housing, wherein the light receiving element and the circuit board are vertically arranged in the same sealed space, A rotary crank angle detecting device, wherein one end of an insert electrode insert-molded in the housing is welded to the light receiving element and the other end is welded to the circuit board in a parallel gap in the space.