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The present invention relates to a microphone in which the vibration of a diaphragm vibrated by
sound is replaced with a change in light quantity, and a light receiving element that receives the
change is a change in current. In the past, the widely used microphones were mainly moving coil
type, followed by capacitor type, but they all have advantages and disadvantages. That is, in the
moving coil type, the mass of the vibrating film and the moving coil determines the frequency
characteristic as a microphone, and the hearing feeling is a gwin nami soku but there is a
drawback that the sense of sensitivity is somewhat lacking. On the contrary, the capacitor type is
lightweight because its movable part is a thin plastic film and metal such as gold is vapordeposited. Therefore, although the expression of the delicate feeling is good, it tends to lack the
feeling of guinaminoku. The present invention combines the disadvantages and advantages of
such conventional moving coil type and capacitor type microphones to improve their
performance, and also enables expression of delicate feeling to be reproduced by Guiminami Sok,
and reproduces realistic hearing. The purpose is to An embodiment of the present invention will
be described below with reference to the drawings. Reference numeral 1 denotes a vibrating
membrane that vibrates due to sound of audio frequency, and the periphery thereof is fixed to
the microphone case 2, and a povin 4 having a slit plate 3 as a light limiting member attached to
the side is fixed at the center. When it vibrates at an audible frequency, it swings to its amplitude
and frequency (Through the bobbin 4, it swings to the ground / throttle plate 3). A light emitting
diode 5 generates visible light or invisible light 4 by applying a direct current voltage to a light
emitting diode, and is housed in a housing case 6 provided on the upper surface side of the
ground plate 3; The light beam is cut in the direction kJ1 from the slit 7 provided on the surface
facing the "node plate 3". Numeral 8 is a photodiode which is a light receiving element, and when
the light beam striking it changes, it generates a change of the current proportional to the
change of the light quantity, and the housing case 9 installed on the lower surface side of the
throat plate 3 Be housed inside). The housing case 9 is provided with a sliding node 10 at a
position corresponding to the ground node 7 of the housing case 6, and the light emitting diode
5 and the photo diode 18, rays from the light emitting diode 5. Are formed to reach the
photodiode 8 through the ground node 7.10. The above-mentioned first island day 0 is provided
with a filter 11 for passing only a light beam of a specific wavelength, and this filter 11 prevents
the influence of extraneous light from being received by the photodiode 8. 5. A filter that allows
the passage of infrared rays is desired 1 12 is a printed circuit board attached to the microphone
case 2 and wiring to the light emitting diode 5 and the light emitting diode 8 and their containing
canes, 6. As installation of 9 is done, the sound il of the microphone!
A cylinder 13 of a synthetic resin is attached to a metal (or t, t) to control unidirectionality. And,
the 7th plate 3 is made of metal or synthetic resin which is blackened with a matting treatment
of J%, and 1 beat 1t! When iil is at rest, the slit 14 is formed at a position coincident with the
ground node 7.10). Further, to the light emitting diode F5, a DC power supply 16 is connected
via a switch 15, and a device 17 is connected to the photodiode 8. Accordingly, when the switch
15 is turned on to direct a direct current to the light emitting diode 5 and the light is turned on,
the light beam passes through the slit 7, the slip [14, the filter 11, the slit 10 and reaches the
photodiode 8. A constant current flows in the At this time, when the diaphragm 1 vibrates at an
audible frequency, the slit plate 3 vibrates according to the amplitude and the frequency, and the
slit 14 blocks a part of the optical path formed by the slits 7.10. As the blocking increases the far
light area as the width of one eyebrow increases, the change of the light quantity also increases,
and the change of the light quantity is performed in a cycle according to the vibration frequency,
so it is replaced with the change of the light quantity corresponding to the sound It will be. Then,
since the resistance value of the photodiode 8 is changed due to the change of the light amount,
the current flowing through the photodiode 8 also changes according to the change of the light
amount, and this is increased by 11L in the middle item 17 and taken out. Act as The present
invention employs an optical sensor as a power generation mechanism as on paper, vibrates a
light restricting member connected to a vibrating film freely vibrating according to an audio
frequency, and the amount of light passing through the optical path of the optical sensor by its
slit. It is something to change. (2) Since it is possible to make the sound quality of the abovementioned light restricting member lighter than that of the conventional moving coil type
vibrating member, it should have an intermediate characteristic between the moving coil type
and the capacitor type. Become. Also, by making the slit width wide even for large amplitudes,
changes in the amount of light according to the amplitude can be obtained without distortion, so
a wide dynamic range can be obtained, and the disadvantages of the movable coil type and
capacitor type microphones are reduced. , Can be a microphone that has its advantages
Brief description of the drawings
FIG. 1 is a front view with a part cut away, FIG. 2 is a side sectional view, FIG. 3 is a sectional
view of the main parts, and FIG. is there.
DESCRIPTION OF SYMBOLS 1 иии Vibrating film, 3 иии Slit plate, 5 иии Light emitting diode, 8 иии
Photodiode, 7, 10.14 иии Slit. Figure 1 Figure 3
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