JP2693002B2 - Circuit device and electrical equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a circuit device and an electric device that protect an electric component from static electricity.

[Prior Art] When an electrostatic device jumps into a circuit and the applied voltage exceeds the withstand voltage of an electric component such as an IC, there are many problems that the electric component mounted on the circuit board is destroyed. It is generally known that static electricity is generated outside of a product, and travels through some path to a circuit. Therefore,
The countermeasure against this static electricity is to electrically disconnect the circuit from the outside. As a path for static electricity generated externally to fly to the circuit, static electricity may fly directly to the circuit board from the opening formed on the exterior of the product. Static electricity is transmitted to the second case that flies and the conductive member that extends from the appearance to the vicinity of the internal circuit board, and the third case that flies to the circuit board.
It is roughly summarized in one. Therefore, the measures that have been conventionally taken in each case are listed below.

In the first and second cases, an insulating member is arranged between the hole or the gap and the circuit board to prevent static electricity from entering.

As a measure against the third case, the conductive member connected to the inside from the exterior was electrically connected to the GND on the circuit, and the static electricity was always dropped to the GND.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional example, as a countermeasure against static electricity,
By arranging an insulating member and connecting a conductive component to GND, the addition of components and mounting and assembly were complicated.

[Means for Solving the Problem] The present invention is characterized in that static electricity entering from the outside is prevented by forming a ground pattern on a circuit board.

[Embodiment] FIG. 1 is a sectional view best showing the features of the present invention, and FIG. 2 is a front view of only a substrate. In FIGS. 1 and 2, reference numeral 1 denotes a circuit board, which includes a hole 1a through which a lens group 7 described later passes, a GND (ground) pattern 1b formed so as to surround the hole 1a, and a circuit pattern (not shown). Has been formed. 2a and 2b are electrical components mounted on the circuit board 1.
3 is the first external component (the exterior of the lens barrel). The second external component 4 is fixed to the first external component 3 with a screw, allows the light flux of the lens group 7 to be described later to pass freely, and has a hole 4a slightly smaller than the diameter of the hole 1a (lens back cover). . Reference numeral 5 is a supporting member (fixed cylinder) for supporting the circuit board 1 described above, 6 is a lens group 7, and the hole 1a of the circuit board 1 and the second member
The lens group holding barrel is capable of passing through the hole 4a of the external appearance component 4 and is driven in the thrust direction by the driving means (not shown) along the support member 5.

In the above configuration, the lens group 7 can pass through,
Since the holes 1a and 4a are formed in the circuit board 1 and the second external appearance component 4, the external appearance component 4 hides the circuit board 1 from the outside, but the inner diameter side of the circuit board 1 is easily exposed from the outside. Since it is easy to touch, static electricity easily enters the circuit board 1 through the hole 4a of the external appearance component 4. However, the circuit board 1
Since the GND pattern 1b that surrounds the inner diameter is arranged in,
The static electricity that enters from the hole 4a of the external appearance component 4 is designed to fall to the GND pattern 1b.

FIG. 3 shows a second embodiment of the present invention. Reference numeral 11 denotes a circuit board, on which a GND pattern 11a and a circuit pattern connected to an electric component 12 (not shown) which will be described later are formed. 12 is an electric component mounted on the circuit board 11 described above.
Reference numerals 13 and 14 denote external parts that form the outer shape of the electric device, and the connecting parts 13a and 14a connect the two parts.

In the above configuration, the GND pattern 11a is provided at a position facing the joint between the two external components 13 and 14 so that static electricity entering through the gap formed between the external components can fall to the GND pattern 11a.

FIG. 4 shows a third embodiment of the present invention, in which 21 is a circuit board, on which a hole 21a for passing a shaft 23 described later and a GND pattern 21b surrounding the hole 21a are formed. 22 is a circuit board
Electrical components mounted on 21. Reference numeral 23 denotes a shaft made of a metal material that penetrates the circuit board 21 and an external component 24 to be described later and is driven by a driving member (not shown) and transmits rotation to an external product (not shown). Reference numeral 24 is an external component that penetrates the aforementioned shaft 23 and forms the external appearance of the product.

In the above configuration, the GND pattern 21a is provided around the shaft 23, and the static electricity that enters through the shaft 23 and invades the GND.
The pattern 21a is designed to easily fall.

In addition, the GND patterns 1b and 11 in the above-described first to third embodiments.
Solders are coated on a and 21b. That is, a resist existing in another area on the GND patterns 1b, 11a, 21b,
By eliminating the insulating coating (not shown) such as the cover lay and coating solder instead of the insulating coating, static electricity can be more easily removed.

[Effects of the Invention] As described above, according to the present invention, electrostatic countermeasures can be taken only by devising the arrangement of the ground pattern on the circuit board. It is possible to eliminate it, it is economical, and it is possible to take measures against static electricity that is easy to assemble.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a first embodiment of the present invention. FIG. 2 is a front view of a substrate shown in FIG. 1. FIG. 3 is a sectional view showing a second embodiment of the present invention. FIG. 4 is a sectional view showing a third embodiment of the present invention. Circuit board 4a …… Hole (opening) 13a ・ 14a …… Connection part 23 …… Shaft 1b ・ 11a ・ 21b …… Grand pattern as conductive member

Claims (8)

(57) [Claims] 1. A circuit device located in the vicinity of an opening formed in an external component of an electric device, wherein a circuit board on which the electric component is mounted has an opening at a position corresponding to the opening of the external component. A circuit device having a ground pattern formed on a surface of the circuit board on which the electric component is mounted so as to surround an opening of the circuit board. 2. An electric device having an exterior component having an opening and a circuit board which is located in the vicinity of the opening of the exterior component and on which an electrical component is mounted, wherein the circuit board is an opening of the exterior component. An electric device having an opening at a position corresponding to the portion, and a ground pattern is formed on a surface of the circuit board on which the electric component is mounted so as to surround the opening of the circuit board. 3. A circuit device located in the vicinity of a connecting portion between a first appearance component and a second appearance component of an electric device, wherein a circuit board on which an electric component is mounted is the first and second appearance components. And a ground pattern formed on the surface of the circuit board on which the electric components are mounted, the ground pattern being formed at a position corresponding to the connecting portion. 4. An electric device comprising a first appearance part and a second appearance part connected to each other, and a circuit board having an electric part mounted on a surface of the connection part in the vicinity of the connection part.
The circuit board is arranged along a direction connecting the first and second external components, and a ground pattern is formed at a position corresponding to the connecting portion on a surface of the circuit board on the connecting portion side. Electrical equipment. 5. A circuit device located near a conductive member penetrating an external component of an electric device, wherein a circuit board on which the electric component is mounted has an opening through which the conductive member penetrates. 2. A circuit device, characterized in that a ground pattern is formed on the surface on which the electric component is mounted so as to surround the opening. 6. An electric device having a conductive member penetrating an external component and a circuit board located near the conductive member and having an electric component mounted thereon, wherein the circuit board has an opening through which the conductive member penetrates. And a ground pattern is formed on a surface of the circuit board on which the electric component is mounted so as to surround the opening. 7. The ground pattern is formed by removing an insulating coating such as a resist or a coverlay from the circuit board and coating solder instead. The circuit device according to 5). 8. The ground pattern is formed by removing an insulating coating film such as a resist or a coverlay from the circuit board and coating solder instead of the insulating coating film. The electric device according to 6).