Ultrasonic probe, and ultrasonic transmitter-receiver system using the same
Provided is an ultrasonic probe having ultrasonic elements and a printed-circuit board that establishes connection between the ultrasonic elements and external wiring, achieving strong connection between the ultrasonic elements and the printed-circuit board mechanically and electrically, and thereby improving performance in examination and diagnosis using the ultrasonic probe. The printed-circuit board with pads each having a via-hole to be bonded to electrode pads of a chip equipped with the ultrasonic elements, is provided with a reinforcement, in an area of the base material where the pad having the via-hole is not formed. The reinforcement is formed simultaneously with forming the pads and wiring on the printed-circuit board, having the same thickness as the pads. With the reinforcement, pressure is evenly applied to the printed-circuit board when the electrode pad is press-fitted into the pad having the via-hole, thereby preventing warping and deforming of the board.
1. An ultrasonic probe comprising,
a chip having a plurality of ultrasonic elements and a plurality of connecting terminals respectively connected thereto, and
a flexible printed circuit having an opening for exposing the plurality of ultrasonic elements and provided with pads along the opening, respectively associated with the plurality of connecting terminals, wherein,
the connecting terminals and the pads are connected by press-fitting bumps provided on the connecting terminals into via holes provided in the pads, and
a first area on a surface of the flexible printed circuit, facing to a second area of the chip where no connecting terminal is formed, is provided with a stiffness reinforcement for increasing stiffness of the flexible printed circuit.
2. The ultrasonic probe according to claim 1 , wherein,
the stiffness reinforcement is formed in a process of forming the pads on the flexible printed circuit, and the stiffness reinforcement has the same thickness as the pad.
3. The ultrasonic probe according to claim 1 , wherein,
both surfaces of the flexible printed circuit are provided with the stiffness reinforcement.
4. The ultrasonic probe according to claim 1 , wherein,
the stiffness reinforcement being adjacent to the pads, is a dummy pad that does not contribute to a signal line.
5. The ultrasonic probe according to claim 1 , wherein,
the opening of the flexible printed circuit has a quadrilateral shape when viewed from the top, and the stiffness reinforcement is formed at each of four corners of the quadrilateral shape.
6. The ultrasonic probe according to claim 5 , wherein,
the stiffness reinforcement has a hook-like shape.
7. The ultrasonic probe according to claim 6 , wherein,
the stiffness reinforcement has an opening used for alignment with the chip.
8. The ultrasonic probe according to claim 1 , wherein,
the flexible printed circuit has a ground line for grounding, and the stiffness reinforcement is connected to the ground line.
9. The ultrasonic probe according to claim 1 , wherein,
the ultrasonic elements and the connecting terminals are formed on the same surface of the chip, and the flexible printed circuit is bonded to the chip in a manner that covers the top surface of the connecting terminals.
10. The ultrasonic probe according to claim 1 , wherein,
the connecting terminals are formed on the undersurface of the chip, with the ultrasonic elements formed on the top surface thereof, and the flexible printed circuit is bonded to the undersurface of the chip.
11. The ultrasonic probe according to claim 10 , further comprising a backing material fixed on the underside of the flexible printed circuit, wherein,
the backing material is positioned below the chip, through the opening of the flexible printed circuit.
12. The ultrasonic probe according to claim 11 , wherein,
the backing material has a level difference between an area facing the ultrasonic elements and a surrounding area thereof, on a contact surface with the flexible print circuit, and the area facing the ultrasonic elements is accommodated in the opening of the flexible printed circuit.
13. The ultrasonic probe according to claim 1 , wherein,
the flexible print circuit comprises bands that are bent to serve as side surfaces, with respect to the surface connected to the chip, and
the ultrasonic probe further comprises an acoustic lens covering the ultrasonic elements on the chip and the side surfaces of the flexible print circuit.
14. The ultrasonic probe according to claim 1 is an ultrasonic probe of an ultrasonic diagnostic system.
15. An ultrasonic transmitter-receiver system, comprising,
an ultrasonic transmitter-receiver configured to transmit an ultrasonic signal to an ultrasonic probe coming into contact with a test subject, and to receive a signal from the ultrasonic probe, and
an ultrasonic image former configured to form an image of the test subject by using the signal received by the ultrasonic transmitter-receiver, wherein,
the ultrasonic probe according to claim 1 is used as the ultrasonic probe.