Printed wiring board and electric device using the same

• US 20050237364A1
• Filed: 04/25/2005
• Published: 10/27/2005
• Est. Priority Date: 04/26/2004
• Status: Active Grant

• Current Assignee: Brother Kogyo Kabushiki Kaisha (Brother Industries Limited)
• Original Assignee: Brother Kogyo Kabushiki Kaisha (Brother Industries Limited)
• Inventors: Ito, Hirosumi
• Granted Patent: US 7,703,889 B2
• Time in Patent Office: Days
• US Class Current: 347/58
• CPC Class Codes: B41J 2/14209 of finger type, chamber walls consisting integrally of piezoelectric material
• CPC Class Codes: B41J 2002/14217 Multi layer finger type piezoelectric element
• CPC Class Codes: B41J 2002/14225 Finger type piezoelectric element on only one side of the chamber
• CPC Class Codes: B41J 2002/14306 Flow passage between manifold and chamber
• CPC Class Codes: B41J 2002/14459 Matrix arrangement of the pressure chambers
• CPC Class Codes: B41J 2002/14491 Electrical connection
• CPC Class Codes: H05K 2201/0133 Elastomeric or compliant polymer
• CPC Class Codes: H05K 2201/0367 Metallic bump or raised conductor not used as solder bump
• CPC Class Codes: H05K 2201/091 Locally and permanently deformed areas including dielectric material
• CPC Class Codes: H05K 2201/10977 Encapsulated connections
• CPC Class Codes: H05K 2203/0195 Tool for a process not provided for in H05K3/00, e.g. tool for handling objects using suction, for deforming objects, for applying local pressure
• CPC Class Codes: H05K 3/0058 Laminating printed circuit boards onto other substrates, e.g. metallic substrates H05K1/0281 takes precedence
• CPC Class Codes: H05K 3/321 by conductive adhesives
• CPC Class Codes: H05K 3/361 Assembling flexible printed circuits with other printed circuits
• CPC Class Codes: H05K 3/365 by abutting, i.e. without alloying process
• CPC Class Codes: H05K 3/4007 Surface contacts, e.g. bumps H05K3/4092 takes precedence; deposition of finish layers on pads H05K3/24; forming solder bumps H05K3/3457

Abstract

There is disclosed a printed wiring board comprising: an electrically insulating flexible layer which has on one of its opposite sides a protrusion which forms a corresponding recess on the other side of the flexible layer; an electrically conducting layer formed on the protrusion; and a wire formed on the flexible layer, connected to the conducting layer, and extending in a direction. The conducting layer has a shape long in the direction of extension of the wire.

Claims

1. A printed wiring board comprising:

an electrically insulating flexible layer which has on one of its opposite sides a protrusion which forms a corresponding recess on the other side of the flexible layer;

an electrically conducting layer formed on the protrusion;

a wire formed on the flexible layer, connected to the conducting layer, and extending in a direction; and

the conducting layer having a shape long in the direction of extension of the wire.

2. The printed wiring board according to claim 1, wherein the shape of the conducting layer is such that a length of a longer side thereof is at least 1.1 times a length of a shorter side thereof.

3. The printed wiring board according to claim 1, wherein the shape of the conducting layer is such that a length of a longer side thereof is at least 1.2 times a length of a shorter side thereof.

4. The printed wiring board according to claim 1, wherein the shape of the conducting layer is such that a length of a longer side thereof is at least 1.3 times a length of a shorter side thereof.

5. The printed wiring board according to claim 1, wherein the shape of the conducting layer is such that a length of a longer side thereof is at least 1.4 times a length of a shorter side thereof.

6. The printed wiring board according to claim 1, wherein the shape of the conducting layer is rectangular.

7. The printed wiring board according to claim 1, wherein the shape of the conducting layer is elliptical.

8. The printed wiring board according to claim 1, further comprising a covering layer which covers at least a part of the conducting layer.

9. The printed wiring board according to claim 8, wherein the covering layer is a solder resist.

10. The printed wiring board according to claim 8, wherein the covering layer covers at least one of two ends of the conducting layer which are opposite in the direction of extension of the wire.

11. The printed wiring board according to claim 8, wherein the covering layer covers a peripheral portion of the conducting layer over an entire circumference thereof.

12. A printed wiring board comprising:

an electrically insulating flexible layer which has on one of its opposite sides a protrusion which forms a corresponding recess on the other side of the flexible layer;

an electrically conducting layer formed on the protrusion;

a wire connected to the conducting layer and extending in a direction on the flexible layer; and

a covering layer which covers at least a part of the conducting layer.

13. An electric device comprising:

an actuator unit which includes a plurality of electrodes formed thereon; and

a printed wiring board comprising;

an electrically insulating flexible layer which has on one of its opposite sides a plurality of protrusions which form a plurality of corresponding recesses on the other side of the flexible layer;

a plurality of electrically conducting layers formed on the respective protrusions;

a plurality of wires formed on the flexible layer, connected to the respective conducting layers, and extending in a direction; and

each of the conducting layers having a shape long in the direction of extension of the wires.

14. The electric device according to claim 13, wherein the printed wiring board further comprising a covering layer which covers at least a part of each of the conducting layers.

15. The electric device according to claim 13, wherein the conducting layers of the printed wiring board are respectively connected to the electrodes of the actuator unit by bonding.

16. The electric device according to claim 13, wherein the actuator unit constitutes a recording head that includes a plurality of recording elements, and the electrodes are formed at respective positions corresponding to the recording elements.

17. The electric device according to claim 16, wherein the recording head is a printhead and the recording elements are a plurality of printing elements, and the electrodes are formed at respective positions corresponding to the printing elements.

18. The electric device according to claim 17, wherein the printhead is an inkjet printhead and the printing elements are a plurality of sets each comprising an actuating portion, a pressure chamber, and a nozzle, and the electrodes are formed at respective positions corresponding to the sets.

19. The electric device according to claim 13, wherein the actuator unit comprises a plurality of actuating portions which are deformable.

20. The electric device according to claim 13, wherein the actuator unit is movable.

21. The electric device according to claim 19, wherein the actuator unit includes a plurality of piezoelectric elements as stacked, and the electrodes are formed on an outermost one of the piezoelectric elements.