JPS61239692A - Flexible pc board - 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 [Technical Field of the Invention] The present invention relates to a flexible PC board used, for example, as an electrode lead-out component in an ultrasonic probe or the like.

[Technical background of the invention and its problems]

For example, in an ultrasonic probe that uses a large number of transducers arranged in a row to transmit and receive ultrasound, a flexible PC (print server) is used to transmit the excitation signals of the transducers and the ultrasonic echo signals obtained from the imager. Kit) board is stored inside the ultrasound probe.

A conventional example of such a PC board will be explained with reference to FIG.

A substrate 3 made of PCCaO2, an insulating material, shown in the same figure.
A conductive pattern for connecting to the electrode of the vibrating element is formed on the substrate 31, and a circuit refining land portion 32 is formed, for example, in the center of the substrate 31. This circuit configuration land portion 32 is formed by drilling holes 34 in circular lands 33 connected to each conductor pattern, and this circuit pattern is formed by connecting a resistor between each hole 34. The aim is to reduce noise in the transmitted signals.

However, since the cable wiring for taking out the PCCaO2 signal is directly attached to the land 33, there is a problem that the wiring time is long and the number of man-hours is increased.

Although not shown in the figure, a coil for forming a resonant circuit for the signal is housed in the connector for extracting the signal from the electrode pattern of the PC board 30, and a coil for forming a resonant circuit for the signal is housed in the connector for extracting the signal from the electrode pattern of the PC board 30. There are also known devices that improve signal transmission characteristics.

However, in this case, there is a problem that the connector becomes larger and the operability deteriorates.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and it is possible to reduce the number of man-hours for cable connections, etc., to integrate the circuit configuration, and to downsize the entire circuit using this PC board. The purpose of this invention is to provide a flexible PC board that can be used.

[Summary of the invention]

To achieve the above object, the present invention provides a flexible PC board in which a large number of patterned conductors for transmitting electrical signals to circuit components having a large number of channels are formed on the board. This is characterized in that a circuit j-configuring land portion and a connector connection portion are formed in correspondence with each conductor at the positions of.

[Embodiments of the invention]

Examples of the present invention will be described in detail below. The flexible PC board shown in Figure 1 is approximately rectangular and made of flexible insulating material (for example, synthetic resin such as polyimide) with a thickness of 25 μm.
An external circuit connecting portion 2 is patterned on a substrate 1 having a thickness of approximately 35 μm using a conductor made of rolled steel foil or the like having a thickness of approximately 35 μm.
Land portion 3 and first to third connector connection portions 5a to 5C
It is constructed by forming.

The external circuit connection section 2 is connected to a substrate 7 as also shown in FIG.
48 external connection conductor parts 4-1 to 4-48 extending to the vicinity of one end 1a side with a minute gap a between them, and the external connection conductor parts 4-1 and 4-48. Ground conductor portions 6a formed on both sides.

6b, and the external connection conductor parts 4-1 to 4-48 and the ground conductor parts 5a and 5b are integrally formed so as to be electrically connected by the cutting conductor part 7 at the stage of molding the conductor. The width of this cutting conductor portion 7 is determined by the minute gap a.
For example, when connecting this flexible PC board to 48 transducers of an ultrasound probe,
The cutting conductor portion 7 is cut in correspondence with the gap formed between each vibrator, and is cut between the ground conductor portions 6a, 6b and each external connection conductor portion 4-1 to 4-48 and each external connection conductor portion 4-. 1 to 4-48 are electrically insulated from each other.

Further, the ground conductor portions 6a, 6b are formed to extend on the substrate protrusions 1b, lc that are formed protrudingly on both sides of the end portion 1a,
Also, along both sides of this substrate 1, a first . It extends to the vicinity of the second connector connection parts 5a and 5b.

The first to third connector connecting portions 5a to 5C are connected to the substrate 1.
is formed on the other end 1d side. That is, an opening 8 consisting of a rectangular opening 8a for inserting a connector and an oblong opening 8b is cut out on the end 1d side, and a first opening 8 is disposed facing the square opening 8a. Second connector connecting portions 5a and 5b are formed, and a third connector connecting portion 5C is formed facing the oval opening 8b.

As shown in FIG.
-16 are patterned with a small gap between them, and a connector is inserted into the conductor portion 9-1.9'-16.
It is constructed by providing U mark portions 10a and ]Ob, and further attaching a reinforcing plate 11 of a constant width to the back surface of the substrate 1.

The second.
The third connector connections 5b, 5c are also described above.

As shown in FIG. 2, the land portion 3 includes a land 13-1 having land holes 12-1 to 12-48 for connecting circuit components such as resistors and coils at approximately the center of the board 1.
〜13-48, and each land 13-1〜
13-48 has the external connection conductor section 4- mentioned above.
1 to 4-48 and first to third connector connection parts 5a to 5
48 conductors each stretched from C are 1
Each article is connected in a corresponding manner.

Note that a total of 48 conductors, 16 of which extend from the first to third connector connecting portions 5a to 5C to each of the lands 13-1 to 13-48 (indicated by broken lines in FIG. 1), are connected to the board. The strips are separated into 16 strips each by minute cutouts 14a and 14b cut out in advance. Further, each conductor on the substrate 1 has a certain range X on the end 1a side of each of the external connection conductor parts 4-1 to 4-48 and the ground conductor parts 6a and 6b, and a land part 3,
Except for a certain range y on the tip side of each of the first to third connector connecting portions 5a to 5C, it is covered with an overlay 15 made of synthetic resin such as polyimide and having a thickness of about 25 μm. Note that this overlay 15 is omitted in FIG. 2. On the overlay 15 covering the first to third connector connection parts 58 to 5C, there are numbers ■, o, o, o, o, ■ are marked.

Further, on each conductor exposed in the certain ranges x and y and the land portion 3, solder plating 16 with a thickness of about 10 μm is applied, as partially shown in FIG. 3 (bl).

In the flexible PC board having the above configuration, the external connection conductor parts 4-1 to 48 are brought into contact with each of the cutting conductor parts 7 cut into external circuit components, for example, 48 vibrators provided in an ultrasonic probe. The conductors of the connectors (not shown) are brought into contact with the connector connection parts 5a to 5c of the first to third connectors of Kunita to K and the first to third connectors to transmit electrical and electrical signals to the vibrator, and also to connect each land hole of the land part 3. 12
By inserting resistor terminals or coil terminals into the terminals -1 to 12-48 to construct a circuit, it is possible to reduce the noise of the electrical signal to be transmitted and to construct a resonant circuit.

Therefore, by using this flexible PC board, there is no need for conventional cable connections, and the number of man-hours can be significantly reduced, and the circuit configuration can be integrated. In addition, since connector connection is possible, operability is excellent.

In addition, when a circuit is constructed on this flexible PC board, the shape of the case that houses this flexible PC board becomes slightly larger, but the first to Third connector connection part 5a-5
There is also an advantage that the position of C can be changed freely to a certain extent, and the degree of freedom in setting the connector insertion position is increased, and as a result, the case can be made smaller.

The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the invention.

For example, in the above-described embodiment, a case has been described in which 48 channels of conductors are formed on the substrate 1, but the present invention is not limited to this, and any number of channels can be formed.

Further, this flexible PC board is not limited to being used for signal transmission of an ultrasonic glove, but can also be used for signal transmission of circuit components having a large number of channels.

〔Effect of the invention〕

According to the present invention described in detail above, by forming the land portion for circuit configuration and the connector connection portion on a flexible substrate, it is possible to reduce the number of man-hours for cable connection etc. and to integrate the circuit configuration. , Moreover, this flexible P
It is possible to provide a flexible PC board that can also reduce the size of the case itself using the C board.

[Brief explanation of drawings]

Fig. 1 is a schematic plan view showing an embodiment of the flexible PC board of the present invention, Fig. 2 is a partially enlarged plan view showing the main parts of the above on an enlarged scale; FIG. 3 is an enlarged and omitted plan view of the connecting portion (bl is a sectional view taken along the line I-I in FIG. 3 (al), and FIG. 4 is a plan view of a conventional flexible PC board. ... External circuit connection part, 3... Land part, 4-1 to 4-48... Row part connection conductor part, 5a
~5C...First...Third connector portion, 8...Opening portion, 13-1 to 13-48...Land. Representative Patent Attorney Kensuke Chika (and 1 other person) (b) Figure

Claims (1)

[Claims] In a flexible PC board in which a large number of patterned conductors are formed on a substrate for transmitting electrical signals to circuit components having a large number of channels, a land for circuit configuration corresponding to each conductor is placed at an arbitrary position on the substrate. A flexible PC board characterized by forming a connector connection part and a connector connection part.