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JPS61235749

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DESCRIPTION JPS61235749
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultrasonic probe which transmits and receives ultrasonic pulse beams to perform ultrasonic flaw
detection or ultrasonic diagnosis and the like. (Conventional technology) Ultrasonic diagnosis or
ultrasonic flaw detection, etc. by transmitting an ultrasonic pulse into a sound quality medium
such as a human body to be diagnosed or a metal welding portion and receiving an echo from
the sound field medium. Ultrasonic probes using piston transducers that perform However, in
this probe, the pressure on the central axis of the piston oscillator is determined by Xo = a ? ? /
? (where a is the radius of the piston oscillator and ? is the wavelength of ultrasonic waves, as
is well known) Reflected echoes generated in the near field do not always exhibit characteristics
that can be treated quantitatively as analytical data because they exhibit complex changes in the
near field closer to the transducer than the near field limit distance x 0 . Then, the following
vibrator is known as what improves the sound pressure characteristic of this piston vibrator. One
of them is a chrysanthemum-shaped electrode pregnant female child in which a plurality of petallike electrodes are formed on at least one end face of the vibrator to stabilize the sound pressure
within the near sound field limit distance, and the other one Is a vibrator in which concentric
electrodes are formed on at least one end face of the vibrator and a stable sound field area near
the near sound field limit distance is continuously generated from the vicinity of the vibrator.
Although these transducers have improved sound pressure characteristics in the near field with
respect to the piston transducer, when different sound pressure characteristics are required,
other ultrasonic waves using transducers of different electrode shapes are used. The probe must
be prepared, which is expensive. (Problems to be Solved by the Invention) The object of the
present invention is to improve the sound pressure characteristics in the near field of a piston
vibrator and to obtain an ultrasonic probe free from the above-mentioned disadvantages. .
(Means for Solving the Problems) The present invention comprises a piston vibrator and a
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contact having a protrusion pattern formed on one end surface thereof for contacting the
vibrator, and the formation of the protrusion pattern results in transmission characteristics of
ultrasonic waves. To improve the sound pressure characteristics in the near sound field. An
embodiment of the invention will now be described with reference to the drawings. In FIG. 1 and
FIG. 2, (1) is a piston vibrator in which the electrode is formed on the entire surface, and this
vibrator (1) is housed in the hole (4) of the housing member (3) together with the damper (2).
The surface was covered with a front plate (9) with a thickness of 1?4 of the wavelength unique
to the oscillator / motor to protect the oscillator and improve sensitivity. (6) is a cylindrical
contact made of silicon rubber or the like, and a protrusion pattern (7) for improving the sound
pressure characteristic to be in contact with the vibrator (1) is formed on one end surface of the
contact.
The projection pattern (7) has a Gaussian distribution in area and is dispersed in, for example,
eight petals, and the ultrasonic wave transmitted from the entire surface of the transducer is
transmitted only to the projection. And others are blocked by the space. Thus, the vibration
approximately similar to the Gaussian distribution is transmitted from the oscillator (1) to the
sound field medium. The housing member (3) is inserted into the small hole (9) from one end
face of the case (8), and then 1 (10 is attached to the case (8) and fixed to the housing member
(3) a The fixing member (delta is positioned in the case (8) by attaching one end thereof to the lid
00 and attaching it. The contact (6) was inserted into the large hole a3 from the other end face of
the case (8), and the protrusion pattern (7) was brought into contact with the vibrator (1)
through the front plate (5). In FIG. 1, (I? is a lead wire connected to the electrode of the vibrator
(1), and this lead wire (+41 is led out through the pipe (lv). According to the configuration of this
embodiment, the vibrator (1) vibrates in the same manner as a conventional piston vibrator, but
an unnecessary transmission portion of the ultrasonic wave transmitted from the vibrator (1)
over the entire space is a space The ultrasonic wave transmitted to the lower end face of the
figure of the contact (6) through the protrusion pattern (T>) is cut off by the The sound pressure
on the directional axis of the sound field created thereby does not cause the complex
disturbances in the near field as in conventional piston oscillators. In FIG. 3, concentric
projections are formed on one end face of the contact (6) as projection patterns (1 ') for
improving the sound pressure characteristics, and each projection (7+') (72 ') ( 73 ') (74') (7s')
was provided with a slit Gs for air removal. The other configurations do not differ from those
shown in FIG. According to the configuration of this embodiment, the vibrator (1) vibrates in the
same manner as the conventional piston vibrator (1), but unnecessary transmission parts for
ultrasonic waves transmitted from the vibrator (1) over the whole surface Block in the space, and
only the effective part is through each protrusion (7+ ') (72') (73 ') (74') (7s ') of the protrusion
pattern (7') and the other of the contacts (6) The ultrasonic wave transmitted to the end face of
the vibrator has the same vibration as that of the conventional vibrator having electrodes of the
shape corresponding to the projections (7+ ') to (7s'), and the near sound field limit distance
produced thereby is near The stable sound field area of the above can be created continuously
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from the vicinity of the vibrator, and the complex change of the sound pressure in the near sound
field observed in the conventional piston vibrator does not occur.
The protrusion pattern formed on the contact is not limited to the above embodiment. (Effects of
the Invention) According to the present invention, by forming a projection pattern in contact with
the piston vibrator on one end face of the contact, the transmission characteristic of the
ultrasonic wave is changed to improve the sound pressure characteristic in the near field. When
different sound pressure characteristics are required, it is advantageous to be economical
because it may be simply replaced with another contact having a different protrusion pattern.
[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view of an embodiment of the present invention, FIG. 2 is a cross-sectional
view taken along the line A-AI of FIG. 1, and FIG. 3 is a plan view of a contact in an embodiment
of the present invention.
(1) иии Vibrator (6) иии Contact (7) (7 ?) иии Protrusion pattern (8) иии Case and other 2 persons Fig. 3
Fig. 2
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