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TECHNICAL FIELD The present invention relates to a microphone switchable between a
directional microphone and a stereo microphone. (Conventional art) Conventionally, as a
microphone device of this type, that is, a microphone device used by being attached to a camera,
there are a unidirectional boom microphone, a zoom microphone, a super directional gun
microphone and the like. Also, recently, stereo recording has become possible with video, and
stereo microphones have also appeared. However, there are only seven microphones and only
one stereo microphone. Therefore, to use these two microphones, it is necessary to hold the
microphone each time. Moreover, the equipment was bulky 9 and it was not preferable from the
viewpoint of camera portability. (Purpose) The present invention is to provide a microphone that
can be used both as a zoom microphone and as a stereo microphone. 1 to 4 show an embodiment
of the present invention. FIG. 1 is a view showing a state in which a microphone of the present
invention capable of manually switching between a narrow directional microphone and a stereo
microphone is mounted on a camera, and FIG. 1 (a) is a side view of the camera; ) Is a front view.
2 (a) and 2 (b) are structural embodiments of the first and the figure microphones. FIG. 3 is a
view showing the microphone according to another embodiment of the present invention
attached to a camera. FIG. 4 (a), fbl is a structural example of the FIG. 3 microphone. In FIG. 1, 1
is a camera, 2 is a lens, 3 is a finder eye cup, 4 is a casing containing a microphone, 5a, 5b and
5c are openings provided in the casing to collect sound from the microphone, 6 is a mounting
member provided on the casing for mounting the microphone to the camera, 7 is a fixing knob
for fixing the mounting member 6 to the camera, and 8 is a switching operation member for
switching the microphone between narrow directivity and stereo , 9 is a cable for conducting the
conduction of the microphone signal and the power between the microphone and the camera,
and 9a is a cable connector. In FIG. 2, 10.11 is a holding member for holding the microphone,
10a and 11a are fitted with the main body, and a holding member rotation shaft for making the
holding member rotatable on its circumference, 10c and IIC are cam plates A cam follower 16
provided on the holding member 10.11 which engages with the cams 16c and 16e of the cam
plate 16 which rotates the microphone along with the movement of 16; 12.14 is a microphone;
13.15 is a casing 10.11; The cam plate is moved by the operation of to control the rotation of the
microphone, 16a is a click stopper for determining the position of the cam plate provided on the
cam plate, and 16b, 16c, 16d and 16e are cams for controlling the rotation of the microphone.
FIG. 3 shows another embodiment of the present invention, in which a microphone is mounted
on a camera when switching between a narrow directional microphone and a stereo microphone
by changing the mounting direction of the microphone. Reference numerals 17a and 17b denote
sound collection openings provided in a casing containing a microphone, and reference numeral
18 denotes a coupling unit for coupling the casing 17 to the camera. The reference numeral 18a
denotes a positioning bin of the joint portion 18 and the casing 17, 19 denotes a switching cam
for controlling the movement of the microphone, 19a and 19b denote fixed bins coupled to the
switching cam 19 and the coupling member 18 ', and 20 moves the casing 17 The click ball
stopped at the switching position, 21 is a click ball for click ball, 22 is a switching interlocking
member for switching the camera side recording circuit to a stereo or monophonic as the
microphone moves, and 23 is a switching interlocking member 22 Is fixed to the microphone
rotating shaft 17d, 24 is an interlocking switching knob engaged with the switching interlocking
member 22 provided on the camera side, 25, 25a, 25b is a camera side stereo seven aural
switching switch, 26 is a rotation of the switching cam 19 The microphone movement control
follower 26a, 26b is moved by 27a, a long groove for guiding along the 27b, 27a, 27b td long
groove 26a, 26b guide bottle, 28.29 the microphone holding frame, 28a. 29a is a microphone
holding frame follower for moving the microphone according to the movement of the follower
26, 28b, 29b are rotating shafts fixed to the casing 17 on which the microphone holding frame
28. 29 is rotatably mounted. (Bl is a view showing a state in which the casing 17 of FIG. 4 (a) is
rotated about the 90 ° rotation shaft 17d Lv. The embodiment of FIG. 1 will be described with
reference to the drawings. FIG. 2 (al is a view showing a case of using as narrow directivity. In
this case, the directional axial directions of the microphones 12 and 14 are the same. Here, it is
known that the directivity of the microphone can be changed by circuit processing from narrow
directivity to single directivity. FIG. 2 (C) shows a state in which the switching operation member
8 is moved from the state in FIG. 2 (al in the direction of the arrow). FIG. 2 (C1 is a case where a
microphone is used for stereo. As the switching operation member 8 is moved in the arrow
direction, the cam plate 16 also moves in the same manner. At this time, the rotating shaft 10a.
11a does not receive any force since it is fitted in the long grooves 16b and 16d.
However, the cam follower 10C211c receives a force by the cam grooves 16c and 16e of the cam
plate 16, so that the microphone holding member 10 ° 11 rotates around the rotation shafts
10a, 10b, lla and llb as shown by the arrows. Therefore, as shown in FIG. 2 (C1), the microphone
is positioned with a symmetrical inclination about the axis of the casing 4 by switching of the
switching operation member. In this case, the directivity axis of the microphone has a peak in the
direction of inclination, and is placed in the stereo recording state. Next, an explanation of the
embodiment shown in FIG. 3 will be made. Fig. 4 is an explanatory view of the structure of the
microphone of Fig. 3 (in the case of al, it is in a state just before the coupling of the camera and
the microphone; In FIG. 3, the directions of the microphone axis and the optical axis are parallel.
Here, the positioning 18a is fitted in the positioning hole 1b, and the mounting screw 7a is
screwed into the main body screw 1a, whereby the microphone is mounted on the main body. In
this state, when the microphone casing is rotated 900 in the direction of the arrow around the
rotation shaft 17C117d, the stereo use state shown in FIG. 4 (bl is reached. FIG. 4 (bl is a view of
the cross section of the microphone rotation shaft section perpendicular to the camera optical
axis in FIG. 4 (a), viewed from the front of the camera. In FIG. 4 (a), when the casing 17 is rotated
in the direction of the arrows 17c and 17d i, the cam 19 is fixed to the coupling member 18 by
19a and 19b. Move in the arrow X direction. Then, since the holding frame followers 28a and
29a provided on the holding frames 28 and 29 are moved, the holding frames 28 and 29 rotate
in the direction of arrow Y around the rotation shafts 28b and 29b. In this way, the microphone
is positioned at an angle that is symmetrical with respect to the camera optical axis, and is in a
stereo recording state. Further, by the rotation of 17d, 24 engaged with 22 is rotated, and the
switch 25 is flipped to the dotted line side by the switching unit 24a provided in 24, and the
conduction of 25 25a is switched to the conduction of 25 25b, Although the microphone
combination is illustrated in the case where monaural and stereo switching are performed on the
camera side by monaural and stereo switching of the microphone, it goes without saying that
circuit switching may be performed manually. Next, FIG. 5 is a block diagram showing the narrow
directivity of the microphone and the switching of the microphone circuit accompanying the
stereo switching.
In the figure, a switch 30.31 is a switch which is switched in conjunction with the switching
control member of FIG. 16 or FIG. 4 etc., and in the case of FIG. It is configurable by 25b. When
the switch 30.31 is connected to the terminals 3Qa and 31a, the microphone has narrow
directivity, and when connected to the terminals 30b and 31b, the microphone circuit is stereo.
In stereo switching, the outputs of the respective microphones are separated and mixed in the
path, then the equalizer adjusts the frequency characteristics, and the amplifier amplifies and
outputs. (Effects) As described above, since one microphone can be used as a narrow directional
microphone, a stereo microphone, or as a zoom microphone or a stereo microphone, it is possible
to collect various sounds according to the situation. Because one microphone can be used for all
uses, it is very effective in terms of portability. In addition, since the circuit for processing the
output signal of the microphone is automatically switched in response to the switching between
the stereo and unidirectionality of the microphone, the operability is excellent.
Brief description of the drawings
FIG. 1 is a view showing a microphone according to a first embodiment of the present invention
which performs microphone switching by the operation of a switching operation member
attached to a camera, FIG. 1 (al is a side view, and FIG. The side view which attached the
microphone of 2nd Example of this invention which performs microphone switching to the
camera is shown.
FIG. 4 is a view showing the structure of the microphone of FIG. 3, and FIG. 4 (al is a view
showing a narrow directivity condition, the patent applicant Canon Inc.