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JPH0397328

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DESCRIPTION JPH0397328
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio signal transmission apparatus used for space transmission of an audio signal or the like. 2.
Description of the Related Art In recent years, with the advent of acoustic devices that spatially
transmit audio signals as optical signals or radio wave signals, the use of cordless devices has
progressed. However, even if it says cordless, in the present circumstances, only between the
transmitting device and the receiving device is cordless, and the earphone speaker and the
earphone speaker driving unit are cord-connected. Although there are headphone types and
cordless ones, cords are connected in the headphones. The prior art will be described below. An
example of the prior art will be described with reference to FIG. 1 No, in the transmitter! The
audio signal ▲ of Qi is converted into an optical signal B by the optical signal transmission unit 1
、 and sent out to space. Next, in the receiving unit, the light signal B is converted into the
electric signal C by the photoelectric conversion unit 2 ▲, and then sent to the skier driving unit
3 ▲. The skier driver 33 amplifies the electric signal C to drive the speaker 4 ▲. The problem to
be solved by the invention is that, according to the above-mentioned prior art, an electric cable is
required between the skier driver 3 ▲ and the speaker 4 ▲ or an earphone speaker (not shown).
In addition, in order to operate the photoelectric conversion unit 2 and the speaker drive unit 3,
the power supply unit (not shown) is also required. The present invention solves the abovementioned conventional problems, and an object of the present invention is to provide an audio
signal transmission apparatus which does not require a power supply unit and an electric cable
and enables good sound quality and volume control. Means for Solving the Problems In order to
achieve this object, the present invention is directed to a condensing lens for condensing an
optical signal of a specific wavelength from space, and in close contact with the condensing lens,
specified from the optical signal A shielding plate which is in close contact with the surface of the
wavelength filter opposite to the condensing lens and which mechanically adjusts the intensity of
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the optical signal of a specific wavelength which has passed through the wavelength filter; It has
a discipline comprising a photoelectric conversion element for converting an optical signal
adjusted by a plate into an electric signal, and an earphone speaker which is directly connected
to a terminal of the photoelectric conversion element and converts the electric signal to sound.
The optical signal of the specific wavelength from the optical signal transmission unit is
condensed according to the function or function, and the specific wavelength is passed and
supplied to the photoelectric conversion element to be converted into an electric signal. The
electrical signal is adjusted in strength with a mechanical shield and supplied to the earphone
scyker to obtain good sound quality and volume control.
In addition, it is possible to realize an optical signal receiving unit that does not require electricity
m (electricity / battery) and an electric cord. Embodiment An embodiment of the present
invention will be described with reference to the drawings. FIG. 1 is a block diagram of a specific
embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an optical signal
transmission unit, which drives a light emitting element (not shown) for emitting a specific
wavelength (for example, infrared light of asonm) to convert an electrical audio signal 変 換 into
an optical signal B It sends to space later. A condenser lens 2 collects an optical signal B
transmitted through space. A wavelength filter 3 transmits a specific wavelength (infrared light
of asonm) from the light signal B. Reference numeral 4 denotes a shielding plate, which adjusts
the intensity at which the light signal B having passed through the wavelength filter 3 is input to
the photoelectric conversion element 6. The 54d photoelectric conversion element converts the
strength of the optical signal B collected via the condenser lens 2 and the wavelength filter 3
button and the shielding plate 4 to an electrical signal C (power and weakness signal). An
earphone speaker 6 converts the electric signal G whose intensity is adjusted by the volume 5
into vibration. The operation of the audio signal transmission apparatus configured as described
above will be described below. First, the operation of the transmitting side will be described. The
audio signal ▲ of the electrical signal input to the optical signal transmission unit 1 of the
present apparatus is a circuit (a drive circuit is generally used) for driving a light emitting
element (not shown) such as LICD having a specific wavelength (for example The light signal B is
converted into a light signal B and sent out to space through a circular structure (not shown).
Next, the receiving side will be described. The condenser lens 2 receives the light of the audio
signal ▲ converted to the optical signal B of a specific wavelength on the transmission side and
sent out to space. The condenser lens 2 operates to efficiently receive the light signal B from an
unspecified position in space. The shape of the condenser lens 2 is not particularly limited, but in
general, it is sufficient that the tip is hemispherical and the lens shape thereafter is cylindrical or
the like. The light signal B received by the condenser lens 2 is transmitted to the wavelength
filter 3 disposed in close contact with one cylindrical surface of the condenser lens 2. In the
wavelength filter 3, a specific wavelength (for example, the wavelength 850n on the transmission
side) is selected from various wavelengths included in ambient light such as natural light and
fluorescent light by passing through space. The effect of disturbance light is eliminated by
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passing only 1), and the light is transmitted to the shielding plate 4 disposed in close contact
with one surface of the wavelength finisher 3. The shielding plate 4 mechanically shields partially
or entirely the light passing through the wavelength resonator 3, and transmits the light to the
photoelectric conversion element 6 by adjusting the amount of light. The structure of the
shielding plate 4 may be either a sliding type or a rotating type, and is not particularly limited.
The photoelectric conversion element 6 converts an optical signal B corresponding to an audio
signal person into an electrical signal only for a specific wavelength. The photoelectric
conversion element 6 can be realized, for example, by using a photodiode, a photo sensor, or the
like, without using an external power supply, and by using an element that converts light into an
electric signal. The light signal B converted into the electric signal supplies and drives the electric
signal D to the earphone skier 6 directly connected to the terminal of the photoelectric
conversion element 4. The earphone speaker 6 is similar to an earphone speaker such as a
normal television or radio, converts an electric signal into air vibration, vibrates the eardrum, and
hears sound. As described above, according to the present embodiment, the light signal receiving
unit 7 does not require a power supply (such as a t pond or a DC power supply), and disturbance
light in space transmission (signals such as natural light and fluorescent light The effect of
disturbing light is eliminated, mechanical volume control and good sound quality can be
obtained. Furthermore, an audio signal transmission device can be realized which does not
require an earphone speaker electrical cord. Also, it is possible to realize an audio signal
transmission apparatus of about the size of earphones from powerless, cordless, etc. As described
above, according to the present invention, by causing the photoelectric conversion element to act
as a pseudo power source, it is possible to realize a power source (battery or DC power source) less. By the wavelength filter and the shielding plate, it is possible to eliminate the influence of
disturbance light (natural light or fluorescent light) and obtain an audio signal with good sound
quality and mechanical volume adjustment. Since the condenser lens and the earphone speaker
can be directly connected to the photoelectric conversion element and the wavelength filter, it is
possible to achieve cordlessness and miniaturization.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram of an embodiment of the present invention.
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FIG. 2 is a block diagram of the prior art. 1-· · · · · · · · · optical signal transmission unit, 2 · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Photoelectric conversion element, 6
..... Earphone speaker.
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