JPS5853895A - Unit type electronic device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention #i relates to a unit type electronic III device.

Conventionally, as shown in Figure 1, one power supply unit (i.e. CPU
A unit-type electronic device in which a unit (2), an l101 unit (3), etc. are fixed to a single motherboard (4) using tightening screws (6) is a sequential control system f.
It is used in the field of IT, (so-called sequencer), etc. Figure 2 shows the internal structure of each unit ill... (3) in such a conventional unit type electronic machine mK. has a built-in printed board ( ) on which electronic components are mounted, and a lid (8) made of metal such as an aluminum plate is attached thereto. A slit (9) is formed in the bottom of the synthetic resin case (6).
The card edge of the printed board (7) is exposed to the bottom side of the case (6) through this slit (9). This card edge (lO) is formed with a wiring base circuit that serves as an external connection terminal, and is adapted to be attached to a socket (not shown) of the motherboard (4). In addition, from the bottom of the synthetic resin case +8+, there are 1-knit fixing pieces (1'4) protruding from both sides that are flush with the bottom. A fixing hole (11) is provided for the purpose of fixing.Furthermore, a connector is provided on the top surface of the resin case (6) to be connected to the electronic components of the printed board (). In the conventional example, round holes Q0 are formed in the four corners of the metal lid body (8), and a screw Oη is inserted into the internal threaded boss in the case (6) through the round holes Q@wo.
It is fixed to the metal lid body i811 by screwing the metal lid body (8) onto the motherboard (4).
Therefore, there is a problem that the shielding effect of foreign noise by the metal lid (8) is small, and the heat dissipation effect through the metal lid (81) is small. The present invention was made in order to solve these problems of the conventional example, and the present invention was made in order to solve the problems of the conventional example, and it is necessary to tightly attach the metal lid body attached to the synthetic resin case to the metal motherboard. The object of the present invention is to provide a type of electronic device that has excellent noise shielding effects and heat dissipation effects.

The configuration of the present invention will be described below with reference to illustrated embodiments. Third
The figure shows one embodiment of the present invention, and as shown in the figure, a plurality of electronic IaII units (201) (20to) are arranged in - rows on one metal motherboard (4). It is implemented in each electronic tis unit (20
1)...(20io) is tightened and fixed to the motherboard (4) by a tightening screw (6). Fig. 4 shows an exploded perspective view of each electronic device unit (201)... A printed board (7) on which electronic components are mounted is built into the plastic case body, and the card edges of this printed board (2012) are exposed on the bottom side of the synthetic resin case body υ. ing. As in the case of the conventional example, this card edge has a wiring board (Ql), which is an external connection electronic, in the form of VL, and is designed to be installed in a socket (not shown) of the motherboard (4). be. (22
L+! It is a metal lid body made by bending a metal plate like a plate into a 1kL shape, and the bottom side of this lid body has a notch at a position corresponding to the card edge +101K of the printed board (7). (c) is provided. Also, round holes (15
) is the shape Ff! , 2! By screwing the screw 0'7) inserted into the round hole 00 into the female screw boss 4, the metal lid body is attached to the synthetic resin case 1). However, from the bottom of the synthetic resin case circle,
Insert the tightening screw (6) into the fixing hole of the unit fixing piece 02) that can protrude from both sides flush with the bottom surface, and then attach the synthetic resin goose screw l) to the fixing hole of the metal motherboard (4) (Fig. (not shown), the bottom of the metal lid body is tightened to the metal motherboard (4), so the lid body
will be electrically and thermally coupled to the motherboard (4), and if the motherboard (4) is grounded,
The lid body is also grounded, thereby shielding the electronic components inside the synthetic wood from foreign noise and preventing malfunctions.
)) The heat generated from the upper electronic components is transferred to the metal lid body 122.
In FIG. 3, this is an α41ti connector, to which the output of a control relay, etc. mounted on the board (7) is connected.

The present invention is KIiU as described above, and an electronic device is built in a square box-shaped synthetic l5IIWfI case with an open bottom and one side, and an L-shaped metal lid is used to connect the bottom and one side. The metal cover and the metal motherboard are designed to be tightly fixed to the metal motherboard, so the metal cover and the metal motherboard are protected from sudden and thermal damage. Therefore, if the mother board is grounded, the electronic components in each electronic device will be shielded from foreign noise, which has the advantage of preventing malfunctions caused by noise. , also electronic Il! The heat generated within the device unit is collected at the side surface of the metal lid and transferred to the metal motherboard via the bottom of the lid, which has the advantage of improving heat dissipation. be

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the conventional example, and Fig. 2 is the electronic 41! FIG. 3 is a perspective view of one embodiment of the present invention, and FIG. 4 is an exploded perspective view of one unit of the same electronic device. 07) Fi screw, (20θ” (20to) Id electronic device 1 nit, sil) is a synthetic resin case, and the handle is a metal lid body. Agent Patent attorney Ishi 1) Choshichi

Claims (1)

[Claims] (1) Electronic equipment is stored in a square box-shaped synthetic resin case with an open bottom and one side, and an L-shaped metal lid that covers the bottom and one side is made mainly of 511 + resin. An electronic device unit that is attached to the case and allows external connection terminals of the electronic device to be exposed to the bottom side through a cutout at the bottom Ifia~Kv of the metal lid, and an electronic device Iiii! ! It consists of a metal motherboard on which a plurality of sockets are arranged to attach the external connection terminals of the unit, and it runs from the bottom of the electronic equipment unit flush with the bottom and on both sides in a direction perpendicular to the arrangement direction of the electronic equipment unit. The metal lid body and the metal motherboard are electrically and thermally connected by tightening the tightening screws into the fixing holes opened at positions corresponding to each other on the protruding unit fixing piece and the motherboard. Knitted electronic device with a characteristic of barking @