JPH0971174A - Electrical unit for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a unit by forming a connector housing with a frame surrounding the periphery of bare chips and filled with a sealing resin and terminals protruded into the frame in the unit provided with a board mounted with the bare chips and the connector housing fixed to the board. SOLUTION: Power MOS-FET elements are used for bare chips 1A-1C in an automatic light unit serving as an electrical unit for a vehicle, and they are mounted on a board 2 made of a metal material such as aluminum via chip dies 6. A connector housing 3 provided with a frame 31 and terminals 32 is fixed to the board 2. The frame 31 is filled with a sealing resin 4, and it is formed to surround the periphery of the bare chips 1A-1C. The terminals 32 and the bare chips 1A-1C are electrically connected by bonding wires 5, then the sealing resin 4 is filled into the frame 31 to seal the bare chips 1A-1C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle electrical unit such as an auto light unit having a bare chip.

[0002]

2. Description of the Related Art A vehicle electrical unit of this type is disclosed, for example, in Japanese Utility Model Laid-Open No. 4-48046. FIG. 6 shows an auto light device for a vehicle in this conventional technique. The auto light device is a device that automatically turns on and off illumination lamps such as head lamps and tail lamps according to the illuminance of the outside of the vehicle, and is an optical sensor that generates an electric signal at a level according to the illuminance of an external light beam received. a, a control circuit b for generating a lighting signal of an illuminating lamp by comparing an electric signal input from the optical sensor a with a predetermined threshold value, and a head lamp c and a tail lamp receiving a lighting signal derived by the control circuit b. It was equipped with relays e and f which closed the electric path leading to d. Incidentally, g and h are manual switches, i is a changeover switch, and j is a power source.

[0003]

However, in the above-described auto light device, it is necessary to electrically connect the unit incorporating the control circuit b, the optical sensor a and the relays e and f using a connector or a harness. This is not only one of the factors that complicates the wiring inside the vehicle body, but also the number of man-hours for connecting the connector in the vehicle assembly line is large, and the unit including the control circuit b, the optical sensor a, and the relays e and f are They had to be managed individually, which was a cause of increasing costs in the vehicle assembly line. As a means for coping with this, it is conceivable to collect the control circuit, the optical sensor and the relay in one unit. However, if they are simply assembled, the unit shape becomes large and the mounting position of the unit is limited. I will end up. For example, the light sensor of the auto light device is generally provided on the dashboard part of the vehicle, but the internal space of the dashboard part does not have much room for accommodation volume, and as a result, it has become large as a result of being assembled as described above. It could be difficult to install the unit in the dashboard section. The present invention is to solve the above-mentioned problems, and in the case where the components such as a control circuit, an optical sensor, and a relay, which are conventionally individually arranged at various places in a vehicle, are assembled into one unit, the size of the unit is reduced. It is an object of the present invention to provide an electric unit for a vehicle that can be made into a vehicle, and is particularly suitable for a place where an installation place of an auto light device or the like is limited.

[0004]

In order to solve the above-mentioned problems, first of all, the invention according to claim 1 is a vehicle electrical unit comprising a substrate on which a bare chip is mounted and a connector housing fixed to the substrate. A vehicle characterized in that the connector housing includes a frame that surrounds the bare chip and into which a sealing resin flows, and a terminal that projects into the frame and that is electrically connected to the bare chip by a bonding wire. An electrical equipment unit is provided.

Further, the invention according to claim 2 provides an electric component unit for a vehicle, wherein a height of a portion projecting into the frame of the terminal is substantially equal to a height of the bare chip. .

Further, the invention according to claim 3 provides an electric component unit for a vehicle, wherein the substrate is made of a metal material and integrally has a mounting bracket for mounting on a vehicle body.

According to a fourth aspect of the present invention, a chip die for mounting the bare chip on a substrate is provided with a bare chip mounting portion and adjacent to the mounting portion, and a bonding wire is fixed to the terminal to electrically connect to the terminal. A vehicle electrical component unit, comprising: a bonding portion that is electrically connected.

According to a fifth aspect of the present invention, the connector housing has a connection terminal formed by projecting a part of the terminal to an outer wall, and an optical sensor having a signal path connected to a bare chip via the connection terminal. And a cover having a light introducing hole for covering an upper surface of the optical sensor and guiding an external light beam toward the optical sensor, and an electric component unit for a vehicle.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment according to the present invention will be described with reference to FIGS.
It will be described based on. This embodiment exemplifies an auto light unit U as a vehicle electrical unit. 1A, 1
B and 1C are bare chips. Bare chips 1A, 1B,
1C uses a power MOS FET element in this embodiment, and the source electrode 1S is formed on the surface as shown in FIG.
And a gate electrode 1G, and a drain electrode 1D on the back surface, and the drain electrode 1D is soldered to the chip die 6. The chip die 6 is a component for mounting the bare chips 1A, 1B, 1C on the substrate 2, and has excellent thermal conductivity,
In addition, it is made of a material such as copper that can be plated. The chip die 6 includes bare chips 1A, 1B, 1
It has a C mounting portion 61 and a bonding portion 62 provided adjacent to the mounting portion 61. The mounting portion 61 is plated with silver (Ag), and the bonding portion 62 is coated with nickel (N).
i) Each plate is plated.

Reference numeral 2 is a substrate. The base plate 2 is made of a metal material such as aluminum and is mounted on the vehicle body.
1 is integrated. Then, an insulating coating is formed on the surface of the portion excluding the bracket 21 with an epoxy resin or the like, and the chip die 6 that is electrically connected to the drain electrodes 1D of the bare chips 1A, 1B, 1C is placed on the substrate 2. However, the drain electrode 1D does not short-circuit with the substrate 2. The bracket 21 fixes the substrate 2 to the vehicle body side, and has a mounting hole 21A for inserting a screw (not shown) to conduct heat generated from the bare chips 1A, 1B, 1C to the vehicle body side via the bracket 21. Have.

A connector housing 3 is attached to the board 2.
Is fixed. The connector housing 3 includes a frame 31 and a terminal 32. The frame 31 is a portion into which the sealing resin 4 such as a silicone resin or an epoxy resin flows, and is formed so as to surround the bare chips 1A, 1B, 1C. Then, after the terminal 32 and the bare chips 1A, 1B, 1C are electrically connected by the bonding wires 5, the sealing resin 4 is flown into the frame 31 and the bare chip 1 is introduced.
A, 1B and 1C are sealed.

The terminal 32 is a portion which is electrically connected to the bonding portion 62 connected to the source electrode 1S, the gate electrode 1G and the drain electrode 1D of the bare chips 1A, 1B and 1C by the bonding wire 5, and which is the connector housing 3 of the connector housing 3. It is insert-molded in the main body. Then, one end 32A thereof is projected into the frame 31,
The other end 32B is projected to the connector part 36, and a part of the outer wall 33 is formed.
The connection terminals 34 and 35 are formed so as to project to the above. The height of one end 32A of the terminal 32 is the bare chip 1A,
The height is substantially the same as that of 1B and 1C, and the connection portion of the bonding wire 5 is plated with nickel (Ni).

The connection terminals 34 and 35 are connected to the sensor substrate 3
7 are inserted into the connection holes 37A and 37B. An optical sensor 7 is mounted on the sensor substrate 37, and a current / voltage conversion circuit U1, a non-inverting amplifier circuit U2, and a headlamp lighting comparator U for processing an output signal from the optical sensor 7 and the like.
3, turn-off delay circuit U4, tail lamp lighting comparator U5, ON / OFF determination circuit U6, constant voltage circuit U
7 and various circuits such as the power-on reset circuit U8.

Further, a cover 8 is placed on the upper surface of the sensor substrate 37. The cover 8 is provided with a light introducing hole 81. The light introducing hole 81 guides an external light beam to the optical sensor 7 and adjusts the incident amount of the incident light beam. Also cover 8
Is provided with a recess 82.
6 is fitted.

The autolight unit U constructed as described above is constructed in each circuit in the vehicle as shown in FIG. That is, in the auto light unit U, the light switch 9 is connected to the input side, and the tail lamp 10 and the head lamp 11 are connected to the output side. Incidentally, the light switch 9 includes a tail lamp contact 91, a head lamp contact 92, an auto light contact 93, and main dimmer switching contacts 94 and 95. Further, 12 is an ignition switch, 13 is an ignition relay, and 14 is a DC power supply.

Next, the operation of the above embodiment will be described.
First, when the tail lamp contact 91 of the light switch 9 is turned on, conduction is established between the drain and source of the bare chip 1A, and the tail lamp 10 is turned on. Next, when the head lamp contact 92 of the light switch 9 is turned on, the drain-source of the bare chips 1B and 1C are electrically connected, and the head lamp 11 is turned on.

Next, when the auto light contact 93 of the light switch 9 is turned on, the operation signal is input to the on / off determination circuit U6 to activate the auto light mode state. In this state, the headlamp lighting comparator U3 and the tail lamp lighting comparator U5 input the preset threshold value and the input signal from the optical sensor 7 input via the current / voltage conversion circuit U1 and the non-inverting amplifier circuit U2. Compare with the level.

Then, when the input signal level from the optical sensor 7 is at the level of the illuminance such as twilight, the tail lamp lighting comparator U5 outputs an ON signal to the bare chip 1A. As a result, the drain-source of the bare chip 1A is electrically connected, and the tail lamp 10 is turned on.

Further, when the input signal level from the optical sensor 7 reaches the darker illuminance level, the headlamp lighting comparator U3 outputs an ON signal to the bare chips 1B and 1C. As a result, the bare chips 1B and 1C are electrically connected between the drain and the source, and the headlamp 11 is turned on.

[0020]

As described above, the present invention has the above-described structure and operation. Therefore, when the components such as the control circuit, the optical sensor and the relay, which have conventionally been individually arranged at various places in the vehicle, are assembled into one unit. Since the unit can be downsized, it is suitable for those where the installation place of the auto light device is limited. In particular, since the connector housing is provided with a frame that surrounds the periphery of the bare chip and also has a frame into which the sealing resin flows, it is not necessary to set a separate member into which the sealing resin flows. Further, since the terminal protruding into the frame and the bare chip are directly connected by the bonding wire, a relatively large current flowing through the head lamp or the tail lamp does not flow through the printed wiring portion of the board, and the pattern width of the printed wiring portion is wide. Therefore, it is not necessary to increase the pattern thickness, the degree of freedom in design is increased, and a so-called bonding pad, which is generally used when bonding to a printed wiring portion, is not required. Further, since the height of the portion protruding into the frame of the terminal is set to be substantially the same as the height of the bare chip, the workability of bonding is good. Further, by forming the substrate with a metal material and integrally forming the mounting bracket to the vehicle body, the heat generated from the bare chip can be satisfactorily transferred to the vehicle body and radiated.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a preferred embodiment of the present invention.

FIG. 2 is a detailed perspective view of the bare chip shown in FIG.

FIG. 3 is a longitudinal sectional view of the one shown in FIG.

FIG. 4 is a plan view of what is shown in FIG.

FIG. 5 is an electric circuit diagram showing a state in which the vehicle shown in FIG. 1 is connected to another portion of the vehicle.

FIG. 6 is an electrical circuit diagram showing a conventional technique.

[Explanation of symbols]

 U Auto light unit 1A, 1B, 1C Bare chip 2 Substrate 3 Connector housing 4 Sealing resin 5 Bonding wire 6 Chip die 7 Optical sensor 8 Cover

Claims (5)

[Claims] 1. A vehicle electrical unit comprising a substrate (2) on which bare chips (1A, 1B, 1C) are mounted and a connector housing (3) fixed to the substrate (2), wherein the connector housing (3) ) Surrounds the bare chip (1A, 1B, 1C) and also has a frame (31) into which the sealing resin (4) flows, and a bare wire (5) protruding into the frame (31) and bonding wire (5). 1A, 1B, 1C), and a terminal (32) electrically connected to the vehicle electrical component unit. 2. The invention according to claim 1, wherein the height of a portion of the terminal (32) protruding into the frame (31) is substantially equal to the height of the bare chip (1A, 1B, 1C). A vehicle electrical unit characterized by the above. 3. The vehicle according to claim 1 or 2, characterized in that the substrate (2) is made of a metal material and integrally has a vehicle body mounting bracket (21). Electrical unit. 4. The invention according to claim 1, 2 or 3, wherein a chip die (6) for mounting the bare chip (1A, 1B, 1C) on a substrate (2) is a bare chip (1A, 1B, 1C) mounting portion (61), and a bonding portion (62) provided adjacent to the mounting portion (61) and for fixing the bonding wire (5) to electrically connect to the terminal (32). A vehicle electrical unit characterized by the above. 5. The connection terminal (34) according to claim 1, 2, 3 or 4, wherein the connector housing (3) is formed by projecting a part of the terminal (32) to an outer wall (33). , 35) and the bare chip (1A,
1B, 1C) an optical sensor (7) having a signal path connected thereto, and an optical sensor (7) covering the upper surface of the optical sensor (7)
And a cover (8) having a light introducing hole (81) for guiding an external light beam toward the vehicle.