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JPS49102323

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DESCRIPTION JPS49102323
Patent Office Secretary 1, Title of the Invention Knee Name Patent Attorney (6214) Blue White
Agate (2 others) 1 ■ Japan Patent Office Open Patent Gazette ■ JP 49-102323 @ Open JP 49.
(1974) 92-/ Request for examination not yet filed (all three pages) Specification 1, Title of the
invention 1, Title of the invention Ultrasonic head
3, patent applicant
3. Detailed Description of the Invention The present invention relates to an ultrasonic head which
emits an ultrasonic beam over a wide range. When an ultrasonic head is used as, for example, asensor of an ultrasonic type vehicle detector, it is necessary to use ultrasonic heads having
various directivity depending on the mounting state. As for the mounting condition, the mounting
height is about 1 meter and the beam center axis is parallel to the road surface, and the
mounting height is 4.7 meters or more, and the beam center axis is with respect to the road
surface There are three types, the diagonal type, which has an angle (60 ° to 700), and the
overhead type, which has a mounting height of 4.7 meters or more and the central axis of the
beam is perpendicular to the road surface. In the case of the side-to-side type and the oblique
type, although it is possible to secure a detection range that can cover one lane even if the
ultrasonic head does not have so wide directivity, in the overhead type Without the spread of the
beam, it is impossible to secure a detection range that can cover one lane. Therefore, when the
ultrasonic head is used overhead, a head that emits a beam over a wide range is required.
However, if the beam width is too wide, it may be possible to detect vehicles passing in the
adjacent lanes, so there is a limit to the spread of the beam width. In the conventional ultrasonic
head, as shown in FIG. 1, a reflector having a frusto-conical surface with an apex angle of 90 ° is
used. In FIG. 1, 1 is an ultrasonic transducer, 2 21 is a first reflector, 3 is a second reflector, and
4 is a reflector. The reflectors 2.2 ', 3' and the reflecting surface of the reflector 4 all have a tilt
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angle of 45 DEG with respect to the axial direction of the transducer 1, i.e. between the top and
bottom of the drawing. Since this structure is conventionally well known, EndPage: 1 will not be
described in detail. FIG. 2 is an outline view of FIG. 1, and the apex angle of the reflector 4 is 90
°. In the one having such a reflector 4, as shown in FIG. 3A-2, the ultrasonic waves emitted from
the vibrator l are reflectors 2.2 at the paths indicated by the arrows 6, 7, 8, 9, and 10. ', 3. The
light is reflected by the reflector 4 and emitted from the opening 5 of the ultrasonic head to the
outside. Then, the size of the reflector 4 is determined so that the phases of the ultrasonic waves
radiated from the respective parts of the vibrator 1 coincide with each other in the plane of the
opening 5. In this case, the directivity of the ultrasonic head can be approximated by the
directivity of a disk of a diameter that vibrates at the same frequency as that of the transducer 1.
Where D is the diameter of the opening 5. As is well known, the directivity of a disk-like sounding
body is inversely proportional to its vibration frequency and diameter.
Therefore, to expand the directivity of the ultrasonic head, it is necessary to use a transducer
with a low resonance frequency or to reduce the aperture diameter of the ultrasonic head.
However, in general, a low-A transducer with a resonant frequency has a large size and an
increased weight. F'Lll-j: If it is small, the ultrasonic radiation area will be small, and a large
ultrasonic output can not be taken out. Therefore, there is a limit to expanding directivity by
using an oscillator with a low resonance frequency, and no effect can be expected. Even when the
size of the reflector is reduced, it can not be made too small due to restrictions such as the size
and structure of the vibrator and the phase matching in the plane of the opening 5. However, the
directivity can not be expected with a head using a reflector having a conical surface with an
apex angle of 90 ° as shown in FIGS. 1 and 2. The present invention has been made in
consideration of the above problems, and its object is to provide an ultrasonic head having wide
directivity. For this reason, in the present invention, the shape of the reflecting surface of the
reflector is special, that is, a shape in which the apex angle is wider than 90 ° and the
frustoconical surface and the apex angle are narrower than 90 ° A frustoconical surface are
combined. . Hereinafter, an embodiment illustrating the present invention will be described in
detail. FIG. 3 is a partial cross-sectional view for showing the structure of one embodiment of the
present invention, and the same reference numerals as in FIG. 1 are given to the parts equivalent
to those in FIG. In FIG. 3 the reflector comprises two parts 11 and 12. The reflecting surface of
the reflector 11.12 is shown in FIG. In the portion 11, as shown in FIG. 4, the apex angle I of the
reflecting surface thereof is larger than 90 °, and the portion 12 has the apex angle θ of the
reflecting surface smaller than 90 °. As seen from FIG. 4, assuming that the angle between the
part 11 and the horizontal direction is α, 2α is smaller than 90 °. Also, assuming that the
angle between the portion 12 and the horizontal direction is β, 2β is larger than 90 °.
Therefore, as shown in FIG. 3, in the portion 11, the ultrasonic wave is projected onto the
reflection surface at an angle of 90 ° -α with respect to @X in the direction perpendicular to
the reflection surface, and further 900- It is reflected from the reflective surface of the portion
11 at an angle of α. The direction of this reflected wave is inclined outward by an angle of 90 °
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−2α with respect to the direction Z parallel to the central axis direction of the vibrator 1.
Further, on the reflection surface of the portion 12, the ultrasonic wave is projected at an angle
of 90 ° -β with respect to the line Y in the direction perpendicular to the reflection surface, and
the ultrasonic wave is further projected at an angle of 90 ° -β with respect to the line Y. It is
reflected from the reflective surface. The direction of the reflected wave is directed inward at an
angle of 90 ° -2β with respect to the direction Z parallel to the axial direction of the vibrator 1.
That is, the ultrasonic wave is inclined outward from the central axis of the vibrator 1 at the
reflection surface of the portion 11 and reflected in two directions, and is inclined toward the
central axis of the resonator 1 at the reflection surface of the portion 12 It is reflected in the
direction. Therefore, the reflected wave from the reflecting surface in the portion 11 is diffused
outward from the central axis of the vibrator 1 and the reflected wave from the reflecting surface
in the portion 12 is focused toward the central axis of the vibrator 1 . Therefore, when an
ultrasonic head having such a reflector is used as a sensor of a dual detector and mounted in an
overhead manner, assuming that the mounting height is 4.7 meters, for example, the angle θ · 0.
The reflection from the reflection surface of the portion 11 is near the road surface at a distance
of about 4.7 meters from the opening end face 5 of the ultrasonic head by appropriately
selecting the dimension of θ and the portion 11.12. The wave can be annularly diffused, so that
the reflected wave from the reflection surface of the portion 12 can be thrown to the state
EndPage: 2 to fill the inward of the annular portion. Thus, the range of the ultrasonic waves
projected onto the road surface can be expanded, and the density of the ultrasonic waves can be
made substantially uniform in the range where the ultrasonic waves are projected. That is, the
ultrasonic wave reflected from the reflector is annularly diffused only by making the apex angle
of the reflector larger than 90 °, and a gap is created between the ultrasonic wave reflected
from the reflector 2 'and so on. Although the directivity can not be referred to as spread,
combining it with a portion whose apex angle is smaller than 90 ° makes it possible to broaden
the directivity of ultrasonic waves and to obtain a substantially gapless distribution.
4. Brief description of the drawings') i-1 is a partial sectional view of a conventional ultrasonic
head, FIG. 2 is an outline view of a reflector in FIG. 1, and FIG. 3 is an embodiment of the present
invention. A partial sectional view, FIG. 4 is an outline view of the reflector in FIG. 1 ··· Ultrasonic
transducer, 11.12 ··· Reflective umbrella. Patent Applicant Tateishi Electric Co., Ltd. Attorney
Attorney Aoyama, et al. 2 other people, 5 List of attached documents (1) Specification 1 (2)
Drawing 11 (3) Power of attorney 1 (4) Request 6. Other Inventors and Agents (1) Inventors (2)
Agent Name Patent Attorney (7629) Toshio Miyai, EndPage: 3
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