JPH0612043U - Liquid jet recording head - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent disconnection of the wiring pattern due to dirt and scratches on the external signal connection contact pad of the liquid jet recording head, and to improve the reliability of electrical contact. [Structure] An ink storage case 8, a film-shaped circuit board 7 extending in the ink storage case 8, and a protective member 15 having a guide window 16 at a position facing the upper part of the film-shaped circuit board 7 The film-shaped circuit board 7 was protected by sandwiching the circuit board 7 between the protective member 15 and the ink housing 8. [Effect] It is possible to provide a compact liquid jet recording head in which there is no disconnection of the wiring pattern due to stains or scratches on the contact pads for external signal connection of the film circuit board.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a liquid ejecting recording head, which ejects the recording liquid from an ejection port by selectively supplying an electric signal to a plurality of protrusion pressure generating means, and performs recording as a flying droplet. Regarding the recording head.

[0002]

[Prior art]

 FIG. 3 shows an example of this liquid jet recording head. Reference numeral 101 denotes a support containing an ink reservoir, an ink protrusion 102 and a circuit board 103 are attached to the support, and a wiring pattern 104 is formed on the circuit board. The circuit board 103 is a board for relaying a signal from the outside to the ink ejection portion, and the wiring pattern 104 is adapted to be electrically connected by pressure contact with an external signal connection terminal or the like.

[0003]

[Problems to be solved by the device]

 However, in the conventional liquid jet recording head as described above, the wiring pattern of the circuit board is exposed. Therefore, especially in the removable liquid jet recording head, the external signal contact portion of the wiring pattern is used for the external signal connection. The contact pads were not suitable for electrical connection between fine patterns because the contact pads failed due to dirt from the user's hand oil and scratches on the wiring patterns.

In order to solve the above-mentioned conventional problems, an object of the present invention is to provide a small and compact liquid without the contamination of contact pads for external signal connection with external signal contact parts and the disconnection due to scratches in the wiring pattern. An object of the present invention is to provide a jet recording head.

[0005]

[Means for Solving the Problems]

 In order to achieve such an object, a liquid jet recording head of the present invention is a liquid jet recording head that utilizes electrostrictive deformation of a piezoelectric substrate, and relays a signal from the outside to an electrode portion of the piezoelectric substrate. The film-like circuit board, which extends to the ink storage case, and also has contact pads for external signal connection. Further, by using a protection member having a guide window, the film-shaped circuit board is sandwiched between the protection member and the ink storage case so that the guide window of the protection member comes to the position facing the upper part of the external signal connection contact pad. Then, the circuit board is protected by electrically connecting the external signal connection contact pad of the film circuit board and the external signal terminal through the guide window of the protective member.

[0006]

[Action]

 According to the present invention, the film-shaped circuit board for relaying a signal from the outside to the electrode portion of the piezoelectric substrate is sandwiched between the ink containing case and the protective member, and the film is provided through the guide window of the protective member. The electrical connection between the external signal connection contact pads of the circuit board and the external signal terminals can be obtained, and the wiring pattern of the circuit board and the external signal connection contact pads are not exposed as in the conventional case, and high density is achieved. Electrical connection with the external signal terminal is made.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention, in which 1 denotes a flat support substrate. Reference numeral 2 denotes a piezoelectric substrate mounted on the supporting substrate 1 by adhesion or the like and utilizing electrostrictive deformation (shear mode) in the sliding direction. The piezoelectric substrate 2 is polarized perpendicular to the plane direction, a plurality of pressure chamber-shaped linear grooves 3 are formed on the upper surface of the piezoelectric substrate 2, and independent electrodes 4 are provided in the grooves 3. Reference numeral 5 denotes a nozzle plate. The nozzle plate 5 has a discharge port 6 and is bonded to the ends 1a 1 and 1b of the rectangular pressure chamber formed by the supporting substrate 1 and the piezoelectric substrate 2 and at the corresponding positions. It is fixed by an agent. Reference numeral 7 denotes a film-shaped circuit board, which extends on the ink containing housing 8 and has a wiring pattern 9 and contact pads 10 for external signal connection. The electrode 4 of the piezoelectric substrate 2 and the wiring pattern are connected via an anisotropic conductive film. The support substrate 1 is provided with a flow channel 11, a common liquid chamber 12, and an ink supply channel 13 which correspond to the pressure chamber-shaped linear groove 3. Reference numeral 14 denotes a protrusion formed on the ink housing 8. Reference numeral 15 denotes a flat plate-shaped protection member, and a guide window 16 is formed at a position corresponding to the external signal connection contact pad 10 of the film-shaped circuit board. The film-shaped circuit board 7 is sandwiched between the protective member 15 and the ink containing housing 8 by heat-sealing caulking or the like of the protrusions 14. Electrical connection between the external signal connection contact pad 10 and an external signal terminal (not shown) is made through the guide window 16 of the protective member 15.

[0008]

[Effect of device]

 As described above, the liquid jet recording head of the present invention has the protective member having the guide window at the position opposite to the external signal connection contact pad of the film circuit board for relaying the external signal to the electrode portion of the piezoelectric substrate. The film-like circuit board is sandwiched between the ink storage case and the protective member, and the external signal connection contact pad and the external signal terminal of the film-like circuit board are inserted through the guide window of the protective member. Since it is electrically connected to the contact pad for external signal connection, there is no disconnection due to dirt on the contact pad for external signal connection or scratches on the wiring pattern, and a small and compact liquid jet recording head can be realized.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of the configuration of a liquid jet recording head of the present invention.

FIG. 2 is an exploded perspective view of a main part of the present invention of the recording head shown in FIG.

FIG. 3 is a perspective view of a conventional liquid jet recording head.

[Explanation of symbols]

 1 Support Substrate 2 Piezoelectric Substrate 7 Film Circuit Board 8 Ink Storage Case 9 Wiring Pattern 10 External Signal Connection Contact Pad 15 Protective Member 16 Guide Window

Claims (1)

[Scope of utility model registration request] 1. A liquid jet recording head utilizing electrostrictive deformation of a piezoelectric substrate, the liquid jet recording head having a film-like circuit substrate for relaying a signal from the outside to an electrode portion of the piezoelectric substrate. , An ink containing case, a film-like circuit board extending to the ink containing case, having a contact pad for external signal connection, and a protective member having a guide window, the film-like circuit board being a protective member It is sandwiched between the ink and the ink housing, and the film-shaped circuit board is protected by electrically connecting the external signal connection contact pad of the film-shaped circuit board and the external signal terminal through the guide window of the protective member. A liquid jet recording head characterized by the above.