JPH02265778A - print head - Google Patents

Abstract

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

Description

TECHNICAL FIELD The present invention relates to a wiring cable that connects a print head and a circuit board that drives the print head. [Prior Art] As electronic devices become more densely packaged, flexible printed wiring cables are used to connect components in order to improve work efficiency during assembly. By the way, the end of such a flexible printed wiring cable and the electronic component are connected by attaching a socket to the end of the cable and inserting the socket into the connection pin of the electronic component. However, this method not only requires the attachment of a socket to the end of the cable, but also has problems such as the size of the connection portion being increased due to the use of the socket. To solve this problem, a widely adopted method is to provide a base with a conductive pattern formed on the end of the flexible printed wiring cable in accordance with the connection bin arrangement of the target component, and to connect this to the bins by soldering. It's starting to be done. However, due to the recent miniaturization of components, the distance between the bins of electronic components has become narrower, and the conductive pattern at the base not only becomes complicated, making soldering work difficult, but also the conductive path of the pattern becomes thinner, reducing reliability. There is a problem that this causes a decrease in current capacity. In order to solve the above problems, some devices use hard substrates made of glass epoxy or other materials to mount electronic components, and use multilayer wiring patterns to increase packaging density and ensure current capacity. However, since it is a hard board, the mounting position with the connector that connects the pigeon board is fixed, which imposes constraints on the print head design and has the disadvantage that the size of the print head section becomes large. Furthermore, when the hard board is attached to and removed from the connector, the hard board is subjected to excessive lateral pressure and bends, and the hanging parts of electronic components mounted on the hard board may peel off. [Problems to be Solved by the Invention] Therefore, the present invention is intended to solve this problem, and its purpose is to design a fixing position of the print head on the carriage with excellent reliability and operability. The aim is to provide a low-cost print head with a large degree of freedom. [Means for Solving the Problems] The print head of the present invention is characterized by using a flexible printed wiring cable in which a wiring pattern is formed on both sides of the signal line connecting the print head and a circuit board that drives the print head. Further, the other end of the flexible printed wiring cable connected to the print head is connected to a circuit board via a connector. [Embodiment 1] Fig. 1 is a side view of a print head in an embodiment of the present invention, Fig. 2 is a rear view as seen from arrow A in Fig. 1, and the print head l is moved in the direction of arrow B during printing. It is fixed on a movable carriage 2, and the carriage 2 is held by a carriage shaft 3.Electronic components such as coils not shown in the figure are mounted on flexible printed wiring cables (hereinafter abbreviated as FPC) 4a and 4b. It is mounted and built into the print head 1. FPC4a, 4b are
As shown in FIG. 3 and FIG. 4, which is a cross section taken along line C-C in FIG. It is a double-sided FPC. The FPCs 4a and 4b are connected to flexible flat cables (hereinafter abbreviated as FFC) 6a and 6b via relay connectors 5a and 5b, which are relay connectors 7. The FFCs 6a, 6b are connected to a circuit board 7 for driving the print head l. By configuring the electronic component mounting board with a double-sided FPC in this way, the problem that occurs when using the conventional hard substrate $i11 such as glass epoxy as shown in FIG. It is possible to avoid restrictions on the mounting position on the hard board 1, and avoid excessive lateral pressure when attaching or detaching the print head l to the connector 12 in the direction of the arrow.
When the hard board 1.1 is bent, the soldered parts of the electronic components mounted on the hard board 1.1 can be prevented from peeling off from the board. By providing relay connectors 5a and 5b near the print head 1 as shown in Fig. 2, the length of the FPC can be saved and costs reduced, and the handling and assembly of the print head when assembling it into the print head can be improved. It is possible to improve sexual performance. Effects of the Invention J As described above, according to the present invention, by using a flexible printed wiring cable in which a wiring pattern is formed on both sides of the signal line connecting the print head and the circuit board that drives the print head, It is possible to lower the backing density of the cable and widen the conductor width of the signal line pattern, resulting in a large current capacity and high reliability. In addition, by using FPC as the mounting board for electronic components, when the board is constructed from a hard board, the board bends due to the excessive lateral pressure that the board receives when attaching and removing the print head, making it difficult to solder the electronic components mounted on the board. Peeling can be prevented and reliability is improved. Furthermore, by providing a relay connector on the other end side connected to the print head of the FPC and connecting it to the circuit board via the FFC, the cost increases due to the additional parts of the relay connector compared to the case where 5FPCs are integrated. In addition, FPC is very expensive compared to FFC, so FP
The cost reduction effect by shortening C is large,
It also has the effect of reducing costs overall. Furthermore, when a relay connector is added compared to the case of an integrated FPC, the FPC protruding from the print head can be shortened, which reduces the area occupied by the print head, improves print head operability, and allows installation of a long FPC. Another effect is that the FPC can be prevented from being dented or bent due to poor handling during assembly, which was the case when the FPC was used, and the ease of assembly is improved.

[Brief explanation of drawings]

FIG. 1 is a side view of a print head showing an embodiment of the present invention. FIG. 2 is a rear view as viewed from arrow A in FIG. Figure 3 is a perspective view of double-sided FPC, Figure 4 is C-C in Figure 3.
Cross-sectional view. FIG. 5 is a perspective view of a print head using a conventional hard substrate. l ・ ・ ・ ・ 2 ・ ・ ・ ・ 3 ・ ・ ・ ・ 4a, 4b 5a, 5b 6a, 6b 7 ・ ・ ・ ・ Print head carriage Carriage shaft double-sided FPC Relay connector FFC Circuit board or more

Claims (2)

[Claims] (1) A printer used for an output device such as a computer is characterized by using a flexible printed wiring cable in which a wiring pattern is formed on both sides of a signal line connecting a print head and a circuit board that drives the print head. print head. (2) The print head according to claim 1, wherein the other end of the flexible printed wiring cable connected to the print head is connected to the circuit board via a relay connector.