JP2590212B2 - Rotation angle detector - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation angle detection device incorporated in a power distribution device for an internal combustion engine, and more particularly to a pickup system using a photoelectric element.

[Conventional technology]

2. Description of the Related Art In an electronic control system of an engine, there is a rotation angle detection device built in a power distribution device that rotates in synchronization with the rotation of the engine as described in Japanese Patent Application Publication No. 83-12635. In this detection device, a light-emitting element and a light-receiving element are opposed to each other, and a disc having a slit is arranged between the light-emitting element and the light-receiving element so as to rotate, so that a light-dark change of light is converted into a voltage change, and a predetermined signal is output. It was done.

[Problems to be solved by the invention]

To output a signal, amplify the output voltage of the photo detector,
Further, an electronic circuit for shaping the waveform is required, and the rotation angle detecting device is constituted by using a hybrid integrated circuit together.

The light receiving element and the hybrid integrated circuit are electrically connected with a lead frame or the like. If the lead frame is long, noise is likely to be induced. In addition, the number of elements such as a capacitor and a Zener diode for preventing such malfunction and destruction of the hybrid integrated circuit is increased. Further, there is a problem that it is difficult to reduce the size and weight of the entire apparatus. An object of the present invention is to provide a rotation angle detection device that is not affected by discharge noise of a power distribution unit.

[Means for solving the problem]

The object is to rotate integrally with a shaft that rotates in synchronization with a crankshaft of an engine, a rotating plate having a predetermined slit, a light emitting element emitting light, and light emitted from the light emitting element and passing through the slit. A light-receiving area responding to
An amplifier for amplifying a signal in the light receiving area, a chip in which the light receiving area and the amplifier are integrally formed, a power supply circuit for supplying power to the chip, a surge protection circuit, and a lead to a connector for extracting a signal to the outside And a hybrid integrated circuit having a frame, wherein the chip is sealed and grounded in a metal can, and the chip is isolated from the hybrid integrated circuit.

[Action]

A region having an effect of generating an electromotive force when receiving light or an effect of reducing an internal resistance on a chip of a light receiving element;
A region forming an amplifier and a voltage comparator is formed. By incorporating this chip in a conductive can, a hybrid integrated circuit as a circuit configuration is not required.
In addition, by connecting the ground line of the chip (preferably a silicon chip) to the can, a conductive shield is provided around the chip. Therefore, the power distribution unit is less susceptible to discharge noise, and malfunction can be prevented.

〔Example〕

 One embodiment of the present invention will be described with reference to the drawings.

 FIG. 1 is a sectional view of a distributor to which the present invention is applied.

A first collar 4 is attached to one end of the shaft 1, and a pin 5 is pressed into a flange 4 a of the collar 4.
The pin 5 is fitted in a hole 7 provided in the flange portion 6a of the second collar 6.

A rotating plate 8 is adhered between the flange portions 4a and 6a, and the second collar 6 and the first collar 4 are connected to the shaft 1 with screws 9.
And press the rotating plate 8 against both flanges.
It is sandwiched between 4a and 6a.

Reference numeral 10 denotes a case made of a synthetic resin, which is integrally formed with a connector 11 for taking out signals to the outside. In addition, a hybrid integrated circuit 12 constituting a power supply circuit of the signal detection circuit and a surge protection circuit is provided in the case 10.

The photoelectric pickup 13 has a shape integrally formed with the holder portion 22 and the case 10, and the case 10 is fixed to a bottom surface of the housing 2 with screws (not shown). Below, the case
An assembly of the hybrid integrated circuit 12 and the photoelectric pickup 13 installed in the unit 10 is called an electronic circuit unit 15.

FIG. 2 is a plan view showing details of the electronic circuit unit 15, and FIG. 3 is a sectional view.

Two metal bushes 28 each having a hole 21 are buried in the case 10, and screws for mounting so as to have the arrangement shown in FIG.

The photoelectric pickup 13 includes a light emitting element 23 and a photo IC 24, and is fixed to the holder 22 and a part 100 of the case 10, respectively.

The lead 23a of the light emitting element 23 is welded to the lead frame 26, and the lead 24a of the photo IC 24 is welded to the lead frame 27.

The terminal 11a of the connector 11 is welded to the lead frame 29, and is electrically connected to the hybrid integrated circuit 12.

The lead frames 26, 27, 29 are made of a material such as brass, phosphor bronze, nickel, iron nickel alloy or the like, and are selected from those having relatively high flexibility and good solderability.

The hybrid integrated circuit 12 comprises an element 12b mounted on a ceramic substrate 12a and lead frames 26, 27 and 29, and these components are joined by solder as is well known.

The hybrid integrated circuit 12 is placed on the case 10 and bonded. When mounted, the lead frames 26, 27, and 29 are the lead 23a of the light emitting element 23, the lead 24a of the photo IC 24, and the terminal 11
It is arranged to approach a. Then, in the next step, they are connected by welding.

FIG. 4 is a plan view of the photo IC 24, as viewed from the AA direction in the sectional view shown in FIG.

Chip 205 is preferably constructed of silicon. As is well known, a photodiode is an element generally formed of silicon and having an effect of generating an electromotive force between a cathode and an anode when receiving light and an effect of reducing an internal resistance. It is also well known that in a monolithic IC, an amplifier or a voltage comparator can be formed using silicon.

The central portion of the chip 205 has a region 20 which has an effect of generating an electromotive force when receiving light and an effect of reducing internal resistance.
5a is provided, and an area 205b constituting an amplifier and / or a voltage comparator is provided therearound.

The chip 205 uses, for example, a conductive adhesive 206, and
Joined to 3. The stem 203 and the cap 202 are made of a metallic member (for example, an iron / nickel / cobalt alloy), and a combination of these two is called a can.

The ground electrode lead 207a is welded to the stem 203 at a portion B,
The power supply electrode lead 207b and the output electrode 207c are held by the insulating glass 204 with respect to the stem 203.

The area 205b of the chip 205 and each electrode lead 207a, 207b, 207c
Are electrically connected by a gold wire 208.

201 is a lens, for example, made of hard lead glass, etc.
It functions as a condenser lens for applying light to the light receiving area 205a of the chip 205.

〔The invention's effect〕

 According to the above configuration, the following effects can be obtained.

Since the photo IC chip and the light receiving area and the amplifier are formed in the same element, the configuration of the external circuit can be minimized.

Since the ground line of the photo IC chip is connected to the conductive can, there is an effect that the noise that jumps around the chip through the space can be shielded.

Therefore, when incorporated in the power distribution device shown in FIG. 1, it is less susceptible to the discharge noise of the high-voltage power distribution unit, and a malfunction as a rotation angle detection device can be prevented.

[Brief description of the drawings]

1 is a sectional view of a power distribution device to which the present invention is applied, FIG. 2 is a plan view showing an embodiment of a rotation angle detecting device, FIG. 3 is a sectional view thereof, and FIG. 4 is a chip of a photo IC. Plan view, fifth
The figure is a sectional view thereof. 1 ... shaft, 2 ... housing, 8 ... rotating plate, 15
…… Electronic circuit unit, 23 …… Light-emitting element, 24 …… Photo
IC, 205 ... chip.

Claims (1)

(57) [Claims] 1. A rotating plate having a predetermined slit that rotates integrally with a shaft that rotates in synchronization with a crankshaft of an engine, a light emitting element that emits light, and a light emitting element that is emitted from the light emitting element and passes through the slit. A light receiving region responsive to light; an amplifier for amplifying a signal in the light receiving region; a chip integrally formed with the light receiving region and the amplifier; a power supply circuit for supplying power to the chip; a surge protection circuit; A hybrid integrated circuit having a lead frame to a connector for extracting a signal to the chip, wherein the chip is sealed and grounded in a metal can, and the chip is isolated from the hybrid integrated circuit. A rotation angle detection device characterized by the above-mentioned.