JP2587439Y2 - Printed board - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board.

[0002]

2. Description of the Related Art Conventionally, for example, the ground of an electric circuit of a camera is electrically connected to a camera body by a lead wire, a screw, or the like from a predetermined conductive exposed portion (a ground extraction position) on a printed circuit board. Was.

[0003]

However, depending on the convenience of mounting, it was necessary to change the position of the ground lead on the board, so that the design change of the printed board itself was unavoidable. The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide a printed circuit board that can easily change a position where a body ground is taken.

[0004]

A printed circuit board housed in an electronic device is provided on the printed circuit board,
First and second ground lead portions (2, 4) independently arranged at different positions to make the reference potential of the printed circuit board the same as the potential of the electronic device; And a selection member (3, 5) for selecting which one of the ground lead portions is to be used.

[0005]

According to the present invention, the selection member selects whether or not to use the ground lead portion even when the layout of the ground lead portion is changed in order to avoid electrostatic noise from electronic equipment. Since it is only necessary to do so, it is possible to make adjustments at the manufacturing site in time and to eliminate the troublesome trouble of changing patterns one by one.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The following embodiments are directed to a printed circuit board to be incorporated in a camera body. FIG. 1 is a partially enlarged view of a flexible printed circuit board incorporated in a camera body, including a copper foil pattern exposed portion to which lead wires shown by broken lines are soldered, and a copper foil pattern exposed portion which is bridged by solder. Parts 1a and 1b. FIG.
It is an enlarged view near a part. FIG. 3 is an enlarged view of the vicinity of the portion 1b in FIG.

In FIG. 2 and FIG. 3, reference numeral 6 denotes the original GND potential connected to the negative terminal of the battery. 2,
Dashed lines 3, 4, and 5 indicate exposed conductor portions that are openings of the coverlay. The copper foil pattern indicated by 7 and the copper foil pattern indicated by 8 are connected on this substrate. 2,
Reference numeral 4 denotes a conductor exposed portion for soldering one end of a lead wire, and reference numerals 3 and 5 denote bridge conductor exposed portions that can be electrically connected to this portion by soldering the cover lay opening. It is. Reference numeral 9 denotes a conductor exposed portion connected to a contact exposed outside the camera.

FIG. 4 is a structural view of a general double-sided flexible printed circuit board. , 14 are through-hole holes, and 15a to 15r are adhesive layers. FIG. 5 is a schematic view of the outer shape of the flexible board incorporated in the camera and the lead wires for dropping the ground to the body, 16a and 16b are the lead wires, 17 is the outer shape of the board,
Reference numerals 8a and 18b indicate exposed conductor portions to which lead wires are connected.

FIG. 6 is a GND system diagram of the camera board. 19 is the original GND potential, 20a and 20b are different body earth parts of the camera body (not shown), 21a and 21b are that the body earth connection part is alive when this switch is closed, 2
2 is a first divided copper foil pattern conducting means, 23 is a second divided copper foil pattern conducting means, 24, 25, 2
Reference numeral 6 denotes a circuit block, an electric contact, or another electric functional structure connected to each.

In this embodiment, in order to avoid intrusion of electrostatic noise from the ground of the camera body, the following two items are required.
One of the two measures can be taken selectively. First, when there is a possibility that external noise may affect the internal circuit of the camera through the copper foil pattern 9, the noise is dropped to the body by a lead wire from the conductor exposed portion 4 shown by 13e in the structural drawing.
This is a method of opening the separated conductor exposed portions 5 indicated by 13c and 13d in the structural drawing.

Secondly, the conductor exposed portion 2 shown by 13e in the structural drawing is dropped to the body by a lead wire, and the separated conductor exposed portion 3 shown by 13c and 13d in the structural drawing is removed.
This is a method in which the conductor exposed portion 5 is made conductive by making it OPEN. In this way, if the printed circuit board is designed, the influence of noise from the copper foil pattern 9 shown at 25 in FIG. 6 should not be transmitted to other circuits 26 connected to the copper foil pattern 6. The open conductor exposed portion 3 indicated by 22 is opened, the conductive exposed portion 5 indicated by 23 in FIG. 6 is made conductive, and the exposed conductor exposed portion 3 located at the portion indicated by 18a in FIG. The ground can be dropped to the body by the lead wire, that is, 21a in FIG. 6 can be conducted, and the copper foil pattern 7 indicated by 24 in FIG.
In order to prevent the influence of noise from being transmitted to the circuit block on the board, the conductor exposed portion 5 shown in FIG. 6 is opened and the conductor exposed portion located at the portion shown by 18b in FIG. The ground can be dropped to the body by a lead wire from 4, that is, 21b in FIG. 6 can be made conductive.

In the above-described embodiment, the description has been given of a printed circuit board incorporated in a camera body. However, the present invention is not limited to this, and for example, printing of a device using a lens or other electric circuit. It can also be applied to substrates.

[0013]

According to the present invention, even if the arrangement of the ground lead portion is changed in order to avoid electrostatic noise from the electronic equipment, the first and second ground lead portions are selected by the selection member. Can be selected, so that it is possible to respond only by reworking at the manufacturing site, and it is possible to eliminate the troublesome work of changing the pattern each time.

[Brief description of the drawings]

FIG. 1 is an enlarged view of a camera substrate according to the present invention.

FIG. 2 is an enlarged view of the vicinity of a portion 1a in FIG.

FIG. 3 is an enlarged view near 1b in FIG. 1;

FIG. 4 is a structural view of a general double-sided flexible printed circuit board.

FIG. 5 is a schematic view of an outer shape of a flexible substrate incorporated in a camera and a lead wire for dropping a ground to a body.

FIG. 6 is a GND system diagram of the camera board.

[Description of Signs] 1a, 1b Conductor exposed portion 2 Lead wire soldering land of conductor exposed portion a 3 Solder bridge conductor exposed portion of conductor exposed portion a 5 Solder bridge conductor exposed portion of conductor exposed portion b 6 Base Copper foil pattern which is GND of 7 Copper foil pattern 8 Copper foil pattern 9 Copper foil pattern connected to external contact

Claims (2)

(57) [Scope of request for utility model registration] 1. A printed circuit board accommodated in the electronic device, provided on the printed circuit board, it the reference potential of the printed circuit board to be the same as the potential of the electronic apparatus
First and second ground extraction portions independently disposed at different positions ; and a selection member for selecting which of the first and second ground extraction portions to use. And printed circuit board. Wherein said printed circuit board, said first and second
A first conductor portion having any one of the ground lead portions; and a second conductor portion provided separately and independently from the first conductor portion. Depending on the use state of the part, the conductive state in which the first conductor part and the second conductor part are electrically connected to each other, and the first conductor part and the second conductor part The printed circuit board according to claim 1, wherein one of a non-conductive state and an electrically non-conductive state can be selectively selected.