JPH03196724A - Space transmission talking device - Google Patents

Abstract

PURPOSE:To attain talking over a wide range with simple constitution by forming a reflecting face reflecting an infrared ray with a silk printing on a mounting face of a LED in the device making talking by means of the infrared ray. CONSTITUTION:Plural LEDs 7 are mounted around a base 6 while an infrared ray luminous section 7a of each LED is tilted aside outward and a reflection face 10 by silk printing is formed to a mount face of the LED 7 of the base 6. A luminous area by the infrared ray from all the LEDs 7 whose directivity is improved by the reflection face 10 is an area 12 as shown in hatched lines, resulting in indicating that the infrared ray luminous intensity beneath an infrared ray luminous device 3 is improved. Thus, the infrared ray space transmission talking over a wide range is attained with a reflection face formed comparatively inexpensively.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a space transmission communication device using infrared rays used in specific areas such as schools and various conference halls.

(Prior art) Fig. 4 is an explanatory diagram of a conventional infrared space transmission communication device, where 1 and 2 are the ceiling and floor of the room where the infrared space transmission communication device is used, and 3 is the one installed on the ceiling 1. infrared light emitting device,
Reference numeral 4 denotes a radio set for receiving light for telephone calls, and 5 indicates a main body of a telephone communication device connected to the light receiving headset 4 for telephone calls.

FIG. 5 is a perspective view showing how the light emitting diode (LED) is installed, 6 is a board provided inside the infrared light emitting device 3 of FIG. 4, and 7 is an infrared light emitting part 7a around the board 6. LE mounted on its side so that it faces outward
In this example, 12 LEDs 7 are provided at approximately equal angles.

In the figure, in response to the movement of the RAD set 4 to receive light for a call in the entire circumferential direction of 360 degrees with respect to the infrared light emitting device 3, infrared rays are emitted from the entire circumference of the infrared light emitting device 3 by a plurality of LEDs 7. Then, a call is made using the light-receiving headset 4 that receives the emitted infrared rays.

The directivity of the infrared rays emitted from the LED 7 used in the above-mentioned infrared light emitting device 3 is the 6th direction when the LED 7 is used alone.
If the LED 7 is provided on the board 6, the infrared light emitting area will be the area 8 indicated by diagonal lines in the figure.
Due to the presence of , a region 9 shown by diagonal lines in FIG. 7 is formed.

Therefore, as a communication area, the infrared light emitting device 3 is located relatively close to the infrared light emitting device 3 at the expense of the emission intensity directly below the infrared light emitting device 3.
It covers from directly below to the horizontal direction where the light emission intensity is improved due to the directivity of the LED 7.

(Problems to be Solved by the Invention) In the above-mentioned conventional infrared space transmission light emitting device, the light emission intensity directly below the infrared light emitting device 3 is reduced due to the directivity of the LED 7. 3
There was a problem that calls could not be made directly under the

An object of the present invention is to provide a space transmission communication device that has a simple configuration and is capable of communicating over a wide range.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a space transmission communication device that includes a light emitting diode (LED) that emits infrared rays and an infrared communication device, and that performs communication using infrared rays. , characterized in that a reflective surface that reflects infrared rays is formed by silk printing on the mounting surface of the LED.

(Function) Since the above method is adopted, a reflective surface is formed on the mounting surface of the LED by silk printing, which is commonly used in the manufacture of printed circuit boards, and this reflective surface prevents light from emitting in directions that would not conventionally contribute to communication. The infrared rays emitted from the LED are reflected in a direction perpendicular to the mounting surface, increasing the emission intensity in this direction.

(Example) An embodiment of the present invention will be described below based on the drawings.

Figure 1 shows an LED used in the space transmission communication device of the present invention.
2 is a perspective view showing an example of the installation configuration, in which a plurality of LEDs 7 are mounted around the board 6 in a horizontally laid state with the infrared light emitting part 7a facing outward, and the L on the board 6 is
A white reflective surface 1O is formed on the mounting surface of the ED7 by known silk printing.

FIG. 2 is an explanatory diagram showing the directivity of the LED 7 shown in FIG. 1. Due to the presence of the reflective surface 10, infrared rays emitted from the LED 7, which conventionally do not contribute to communication, are reflected in a direction that does not contribute to communication. The directivity of infrared rays in the direction perpendicular to the mounting surface 6 (in the six directions of the arrows) is improved to the extent of region 11, and the emission intensity of infrared rays in the vertical direction is increased.

FIG. 3 is an explanatory diagram showing the communication area by the space transmission communication device of the present invention, where 1 and 2 are the ceiling and floor of the room where the space transmission communication device is used, and 3 is the infrared light emitting device installed on the ceiling 1. The device 4 is a movable infrared communication device that performs communication using infrared rays emitted from the infrared light emitting device 3.

In the same figure, all LEs with improved directivity with one reflective surface 10
The infrared light emitting area from D7 is a shaded area 12, and the infrared light emission intensity directly below the infrared light emitting device 3 is improved.

In this way, in this embodiment, the infrared rays emitted from the LED 7 in one direction of the ceiling (direction of the board 6), which is unnecessary for the telephone call, are emitted from the LED 7.
Since it is reflected by the white reflective surface 10 on the mounting surface of 7,
The light emission intensity near the infrared light emitting device 3, which has decreased due to the directivity of the ED7, is improved.

Further, the light emission intensity in the horizontal direction is ensured because the directivity of the LED 7 alone is not impaired.

According to the above embodiment, the white reflective surface 10 on the mounting surface of the LED 7 reflects infrared rays that would conventionally be emitted in unnecessary directions without contributing to a call, with higher efficiency. The infrared communication device 4 can be used over a wide range because the infrared emission intensity can be ensured.
In particular, the vertical directivity is improved, so it can be used in places with high ceilings such as halls and theaters.

(Effects of the Invention) According to the present invention, the directivity in the direction perpendicular to the mounting surface is improved by reflecting infrared rays, which were conventionally emitted in directions that do not contribute to communication, on a reflective surface formed by silk printing. It is possible to provide a space transmission communication device that can perform wide-range infrared space transmission communication using a reflecting surface that can be improved and formed at a relatively low cost.

[Brief explanation of drawings]

Figure 1 shows an LED used in the space transmission communication device of the present invention.
FIG. 2 is an explanatory diagram showing the directivity of the LED shown in FIG. The figure is an explanatory diagram of a conventional infrared space transmission communication device, Figure 5 is a perspective view showing the installation state of a conventional LED, and Figures 6 and 7 are L
It is an explanatory view showing directionality of ED. 3...Infrared light emitting device, 4...Infrared communication device, 6...Substrate, 7...Light emitting diode (L E
D), 7a-light emitting section, IO... reflective surface.

Claims (1)

[Claims] A space transmission communication device that includes a light emitting diode that emits infrared rays and an infrared communication device and that performs communication using infrared rays, characterized in that a reflective surface that reflects infrared rays is formed by silk printing on the mounting surface of the light emitting diode. Space transmission communication device.