JPS6271342A - Infrared ray type transmitter - Google Patents
Infrared ray type transmitterInfo
- Publication number
- JPS6271342A JPS6271342A JP60211305A JP21130585A JPS6271342A JP S6271342 A JPS6271342 A JP S6271342A JP 60211305 A JP60211305 A JP 60211305A JP 21130585 A JP21130585 A JP 21130585A JP S6271342 A JPS6271342 A JP S6271342A
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- infrared light
- emitting diodes
- angle
- infrared ray
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/18—Printed circuits structurally associated with non-printed electric components
Abstract
Description
【発明の詳細な説明】
［技術分野］
本発明は配線機器に用いられる赤外線式発信器に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an infrared transmitter used in wiring equipment.
［背景技術１
この種の配線器共が事務所などの広い部屋で用いられる
場合、制御範囲は比較的近距離から遠距離までとなるの
で、指向角ができるだけ広い赤外線式発信器を用いなけ
ればならない。しかし、従来のこの種の赤外線式光イｉ
↑器に用いられる赤外線発光ダイオードには指向性があ
り（たとえばＬＮＧ６ではメーカ発表で゛Ｖ−俯角±２
５゛）、充分に広い指向性を得ることは困１ｉであった
。[Background technology 1] When this type of wiring device is used in a large room such as an office, the control range is from a relatively short distance to a long distance, so it is necessary to use an infrared transmitter with as wide a directional angle as possible. It won't happen. However, this type of conventional infrared light i
↑The infrared light-emitting diode used in the device has directivity (for example, in LNG6, the manufacturer announces ゛V - angle of depression ± 2
5), it was difficult to obtain a sufficiently wide directivity.
［発明の目的］
本発明は上述の点に鑑みて為されたものであり、その目
的とするところは、赤外線発光ダイオードを用い指向角
を広くできる赤外線式発信器を提供することにある。[Object of the Invention] The present invention has been made in view of the above-mentioned points, and its object is to provide an infrared transmitter that uses an infrared light emitting diode and can widen the directivity angle.
［発明の開示１
（実施例）
第１図は本発明の一実施例を示す図であり、これは複数
個（本実施例では電池を電源とすることによる制限から
１０個としである）の赤外線発光ダイオードＬＤ、〜１
．ＤＩ。を扇状に配設したものであり、各赤外線発光ダ
イオードしＤ１〜ＬＤ、。[Disclosure of the Invention 1 (Embodiment) Fig. 1 is a diagram showing an embodiment of the present invention, in which a plurality of (10 in this embodiment due to limitations due to the use of batteries as a power source) Infrared light emitting diode LD, ~1
．． D.I. are arranged in a fan shape, and each infrared light emitting diode is D1 to LD.
は夫々異なる水平方向に光を投光するようになっており
、さらに垂直方向にもリードを折り曲げるようにしてプ
リント基板１上に配設しであるものである。そして、こ
れらの赤外線発光ダイオードＬＤを駆動回路（図示せず
）によってすべて同時に発光させることにより、広い範
囲に光信号を送信するものである。are arranged on the printed circuit board 1 so as to project light in different horizontal directions, and the leads are also bent in the vertical direction. By causing all of these infrared light emitting diodes LD to emit light simultaneously by a drive circuit (not shown), an optical signal is transmitted over a wide range.
土泥赤外線発光グイオードＬＤ、〜ＬＤ、ｏの水平方向
及び垂直方向の向きに関して説明する。まず、本実施例
では次に示す事務所等の広い部屋での赤外線式発信器Ａ
の無指向性を得ることを目的としているものである。第
２図は事務所等の部屋での赤外線式発信器Ａと受信器Ｂ
の設置場所を示す図であり、同図（、）が平面図で、同
図（ｂ）が側面図である。ここで示されている赤外線式
発信器Ａはマスター発信器で、この赤外線式発信器Ａを
図中下側の壁１０に設置し、受信器Ｂを天井１１に設置
しである。この場合赤外線式発信器Ａの水平方向で光を
発信するに必要な角度は前方から左右ｌ：９０°づつ必
要で、垂直方向には赤外線式発信器Ａから立てた垂線よ
り上方に９０°必要である。The horizontal and vertical directions of the earth and mud infrared light emitting diodes LD, -LD, o will be explained. First, in this embodiment, an infrared transmitter A is used in a large room such as an office as shown below.
The purpose is to obtain omnidirectionality. Figure 2 shows infrared transmitter A and receiver B in a room such as an office.
FIG. 3 is a diagram showing the installation location, with (,) being a plan view and (b) being a side view. The infrared transmitter A shown here is a master transmitter, and the infrared transmitter A is installed on the lower wall 10 in the figure, and the receiver B is installed on the ceiling 11. In this case, the angle required for infrared transmitter A to transmit light in the horizontal direction is 90 degrees on each side from the front, and 90 degrees vertically above the perpendicular line from infrared transmitter A. It is.
つまり、この範囲の空間では赤外線式発信器Ａに無指向
性が必要となる。そして、本実施例では電池容量による
規制により赤外線発光ダイオードＬＤ１〜ＬＤ、、を１
０個しか用いることができない。In other words, in this range of space, the infrared transmitter A needs to be omnidirectional. In this embodiment, the infrared light emitting diodes LD1 to LD, .
Only 0 can be used.
したがって、１０個の赤外線発光ダイオードＬＤ、〜Ｉ
＝ Ｄ 、、で水平方向−９０゛〜＋９０°の範囲をカ
バーする必要がある。つまり、Ｏ°〜９０゛の範囲を赤
外線発光ダイオードＬＤ、〜ＬＤ、０のうちで５個づつ
でカバーする必要があることになる。ここで、制ａｌｌ
範囲が１５１以内であるとし、赤外線発光ダイオードＬ
Ｎ６６の発光特性を実測した値（第３図及びｆｐＪ４図
に示し、内側の細い実線が赤外線発光グイオード１個、
内側の破線が２個、−７つ鎖線が３個、２点鎖線が４個
、外側の破線が５個、外側の細い実線が６個用いた場合
を示す）を基準として用いる。そして以降の説明で使用
する水平方向の広がりを第３図に太い実線にて示し、指
向角を第４図に太い実線にて示しである。Therefore, 10 infrared light emitting diodes LD, ~I
= D, , it is necessary to cover the range of -90° to +90° in the horizontal direction. In other words, it is necessary to cover the range of 0° to 90° with five infrared light emitting diodes LD, -LD, and 0 each. Here, control all
The range is within 151, and the infrared light emitting diode L
The actual measured values of the light emission characteristics of N66 (shown in Figure 3 and fpJ4, the inner thin solid line indicates one infrared light emitting diode,
2 inner broken lines, 3 -7 dashed lines, 4 double-dot chain lines, 5 outer broken lines, and 6 outer thin solid lines) are used as standards. Further, the horizontal spread used in the following explanation is shown by a thick solid line in FIG. 3, and the directivity angle is shown by a thick solid line in FIG.
この水平方向の広がりは実測値の３分の１の値を用い、
指向角は１５舶の点が最悪値であるのでこの点の値の３
分の１を動作指向角として用いる。For this horizontal spread, use a value that is one-third of the actual measurement value,
As for the directivity angle, the worst value is at the point of 15 ships, so the value at this point is 3.
1/1 is used as the motion directivity angle.
この理由は蛍光灯の影響及び赤外線発光ダイオードＬＤ
のばらつきを考慮するためである。したがって、１個当
たりの赤外線発光ダイオードＬＤの水平方向の広がりは
第３図の１個の赤外線発光ダイオード１．、、 Ｄの実
測値から求めて５〜１５鴫では１゜８ ＋ａとなり、動
作指向角θａは
θａ＝ｊａｎ−’［６Ｘ（１／ ３ ）／ １５ ］＝
７ 、６゜となる。The reason for this is the influence of fluorescent lights and infrared light emitting diodes.
This is to take into account the variation in Therefore, the horizontal spread of each infrared light emitting diode LD is equal to the width of one infrared light emitting diode LD in FIG. ,, Determined from the actual measured value of D, it becomes 1°8 + a for 5 to 15 yen, and the motion directivity angle θa is θa = jan-' [6X (1/3) / 15 ] =
7.6°.
そこで、第５図のように水平方向に赤外線発光ダイオー
ドＬＤ、〜［、Ｄ、を配列するとし、各赤外線発光ダイ
オードＬＤ、〜ＬＤ５開の間隔θ２とし、壁１０の表面
に相当する紬Ｘと赤外線発光ダイオードＬ、 Ｄ 、の
投光する光軸、及び壁１０に垂直に立てられた垂線に相
当する紬ｙと赤外線発光ダイオード１．、 Ｄ 、の投
光する光軸とのなす角を０１とし、動作指向角θａを簡
単の為に７．５゛ とすると、θ２は１５° となり、
４θ２＋２θ１＝９０゜
から、θ１は１５° となる。したがって、総ての赤外
線発光グイオードＬＤ、〜ＬＤ、を１５°間隔で設置す
れば良いことが分かる。Therefore, as shown in FIG. 5, the infrared light emitting diodes LD, ~ [, D, are arranged in the horizontal direction, and the distance between each infrared light emitting diode LD, ~LD5 is θ2, and the pongee X corresponding to the surface of the wall 10 is The optical axis of the infrared light emitting diodes L, D and the perpendicular line erected perpendicular to the wall 10 correspond to the pongee y and the infrared light emitting diode 1. If the angle formed by , D and the optical axis of light projection is 01, and the motion directivity angle θa is 7.5° for simplicity, then θ2 will be 15°, and since 4θ2 + 2θ1 = 90°, θ1 will be 15°. Become. Therefore, it can be seen that all the infrared light emitting diodes LD, ~LD, should be installed at intervals of 15 degrees.
次に垂直方向の設置状態について説明する。第３図に示
すように赤外線発光ダイオードＬＤの水平方向の広がり
を５〜１５ｍは１．８ｍとしたことに伴い、垂直方向に
関しても５〜１５ｍは１．８ｍの広がりを持つことにな
る。そして赤外線式発信器Ａの取付位置を第６図に示す
ように床１２から１．３ａ＋、天井１１の高さを２．６
１とすると、この場合で天井の中点Ａの仰角θｂは９．
８°（以降簡単のため１０° とする）となるので、こ
の仰角θｂが１０°の線上に光軸の中心が来るように赤
外線式発信器Ａの赤外線発光ダイオードＬＤを向ければ
ほば０〜１５ｍの範囲をカバーできることになる。Next, the installation state in the vertical direction will be explained. As shown in FIG. 3, since the horizontal extent of the infrared light emitting diode LD is 1.8 m from 5 to 15 m, the vertical extent is also 1.8 m from 5 to 15 m. As shown in Figure 6, the installation position of the infrared transmitter A is 1.3a+ from the floor 12, and the height of the ceiling 11 is 2.6a.
1, the elevation angle θb of the midpoint A of the ceiling is 9.
8 degrees (hereinafter referred to as 10 degrees for simplicity), if the infrared light emitting diode LD of the infrared transmitter A is oriented so that the center of the optical axis is on the line where the elevation angle θb is 10 degrees, the angle will be approximately 0 to 10 degrees. This means that it can cover a range of 15m.
上述より赤外線発光ダイオードＬＤの取付方向は水平方
向に１５゛の間隔で配列し、垂直方向に仰角１０”の傾
きを付ければ良いことが分かる。From the above description, it can be seen that the infrared light emitting diodes LD may be mounted horizontally at intervals of 15 degrees and vertically tilted at an elevation angle of 10 inches.
しかし。このままの数値では赤外線発光ダイオードＬＤ
のプリント基板１への取付方向が不明である。but. If the numbers remain as they are, infrared light emitting diode LD
The mounting direction on the printed circuit board 1 is unknown.
したがって、次にプリント基板１への取付方向について
説明する。ここで、プリント基板１は赤外線式発信器Ａ
を１！ｌ！１０に設置したとき水≠方向に向くように取
り付けられているものとする。すると第７図に示すよう
に赤外線発光ダイオードＬＤのり−ド３を括り曲げ、こ
の折り曲げ角度θｄを１０° とし、第８図（こ示すよ
つに水平方向の角度θＣを］５°にすれば良いことにな
る。尚第８図中には赤外線発光ダイオードＬＤのリード
３が挿入される挿入孔２を示しである。Therefore, next, the mounting direction to the printed circuit board 1 will be explained. Here, the printed circuit board 1 is an infrared transmitter A.
1! l! 10, it shall be installed so that it faces in the direction of water≠. Then, as shown in Fig. 7, the infrared light emitting diode LD glue 3 is bent together, the bending angle θd is set to 10°, and the horizontal angle θC is set to 5° as shown in Fig. 8. In addition, FIG. 8 shows the insertion hole 2 into which the lead 3 of the infrared light emitting diode LD is inserted.
こ：で、全く光信号の反射がないと仮定した場合には第
９図に示すように＄制御不能距離久Ｃ１が存在し、天井
１１を抜けて直進すると仮定した場合の垂直方向の広が
りは上述の５〜１５１カより長くなり垂直方向の広がり
Ｑ７＾、が狭くなる。ｖＪ９図は床１２から赤外線式発
信器Ａの取付位置までの高さを１ 、３ ＋ｏ、天井１
１までの高さを２．６葎とした場合である。この条件に
基づき上記制御不能距離０、 ＣＩ及び垂直方向の広が
り０．Ａ３を求めると、制御不能距離Ｑｃ、は
Ｑｃ、＝１．３ ／ ｔａｎθＣ２
となり、ここでθｃ２は仰角θｂに赤外線発光グイオー
ＶＬＤの半値角（ＬＮ６６Ｓでは±２５°）を足したで
直である。So, if it is assumed that there is no reflection of the optical signal at all, there will be an uncontrollable distance C1 as shown in Figure 9, and if it is assumed that the optical signal passes through the ceiling 11 and goes straight, the vertical spread is It becomes longer than the above-mentioned 5 to 151, and the vertical extent Q7^ becomes narrower. The vJ9 diagram shows the height from the floor 12 to the installation position of the infrared transmitter A as 1, 3 + o, and the ceiling as 1.
This is the case where the height up to 1 is 2.6 cucumbers. Based on this condition, the above uncontrollable distance is 0, CI and vertical spread are 0. When determining A3, the uncontrollable distance Qc is Qc, = 1.3 / tan θC2, where θc2 is the elevation angle θb plus the half-value angle of the infrared light-emitting Goo VLD (±25° for LN66S).
そして垂直方向の広が’）０．Ａ、は
の＾コニ０．八２Ｘｔａ電１θ Ａ３
となる。ここでグへ、は光が天井１１を直進した場合の
距離、つまり光が直進した直線に部屋の隅Ｃから垂線を
下ろした所までの距離を示し、θ＾３はθＡ３＝θｂ−
θＡ２
であり、θＡ２は部屋の隅Ｃの赤外線式発信器Ａカ・ら
見た仰角である。and vertical spread')0. A, Hano^Koni0. 82Xta electric 1θ A3. Here, G indicates the distance when the light travels straight on the ceiling 11, that is, the distance from the corner C of the room to the point where a perpendicular line is drawn down to the straight line that the light travels, and θ^3 is θA3 = θb-
θA2 is the angle of elevation seen from the infrared transmitter A in the corner C of the room.
上記２式によって赤外線発光ダイオードＬ Ｄの取付基
準、つまり赤外線発光ダイオードしＤのリード３の７オ
ーミング角θｄ、及シブリント基板の取付孔の傾耕角θ
Ｃに討°して最大±３°ずれた場合を計算すると
１．７Ｉ≦Ｑ、Ｃ１≦２．１１
となる。しかし実際は床１２、天井１１、室内の器具等
により光の反射があるので制御不能距離グＣ５ほかなり
小さくなる。したがって、赤外線式発信器への設置され
た壁１０の直ぐ近くに受信器Ｂを取り付けない限り特に
問題となることはない。Based on the above two equations, the mounting standards for the infrared light emitting diode LD, that is, the 7 ohm angle θd of the lead 3 of the infrared light emitting diode D, and the tilting angle θ of the mounting hole of the shiblint board.
Considering C and calculating the case where there is a maximum deviation of ±3°, it becomes 1.7I≦Q and C1≦2.11. However, in reality, since light is reflected by the floor 12, ceiling 11, indoor fixtures, etc., the uncontrollable distance C5 becomes considerably smaller. Therefore, there is no particular problem unless the receiver B is installed in the immediate vicinity of the wall 10 where the infrared transmitter is installed.
さらに垂直方向の広が’）ＬＡ３についても上記誤差を
＃慮して計算すると、
０．５ ｍ≦ ηＡコ≦ ２ ・ ０１となる。赤外線
発光ダイオードＬＤの広がりに関しては充分な余裕を持
たせていること及び上述の光の反射によって問題となる
ことはない。Furthermore, when calculating the vertical spread ') LA3 in consideration of the above error, it becomes 0.5 m≦ηA≦2·01. Regarding the spread of the infrared light emitting diode LD, there is no problem due to the sufficient margin and the above-mentioned light reflection.
以上より本発明が実用範囲内で無指向性を確保できるこ
とが分かる。From the above, it can be seen that the present invention can ensure omnidirectionality within a practical range.
ｉ発明の効果１
本発明は上述のように、複数個の赤外線発光ダイオード
を光の投光方向を投光指向性の略半値角だけ異ならせて
プリント基板上に配設し、駆動回路にてすべての赤外線
発光ダイオードを同時に発光しているので、ある一方向
に対して略半値角分だけずらせて赤外線発光ダイオード
を配設することにより扇状に赤外線発光ダイオードの光
を投光でき、略一定な強さの光を広い範囲に投光できる
から、受信器の設置場所の限定が少なくなり、赤外線式
発信器と受信器との光帖合わせが不要となる効果を奏す
る。i Effect of the Invention 1 As described above, the present invention includes a plurality of infrared light emitting diodes arranged on a printed circuit board with their light emitting directions differing by approximately the half angle of the light emitting directivity, and a driving circuit. Since all the infrared light emitting diodes emit light at the same time, by arranging the infrared light emitting diodes so that they are shifted by approximately half the angle in one direction, the light from the infrared light emitting diodes can be projected in a fan shape, and the light from the infrared light emitting diodes can be emitted at a substantially constant level. Since strong light can be projected over a wide range, there are fewer restrictions on where the receiver can be installed, and there is no need to match the infrared transmitter and receiver.
第１図は本発明の一実施例に用いられる赤外線発光ダイ
オードの配列状態を示す斜視図、第２図（ａ）は同上の
部屋での設置状態を示す平面図、同図（ｌ］）は第２図
（、）の側面図、第３図及び第４図は同上に用いられる
赤外線発光ダイオードの発光特性を測定した結果を示す
説明図、ｆ５５図は赤外線発光ダイオードの水平方向へ
の投光状態を示す説明図、第６図は赤外線発光ダイオー
ドの垂直力向の投光角度を示す説明図、第７図は赤外線
発光ダイオードの加工状態を示す側面図、ｆｐＪ８図は
赤外線発光ダイオードが取り付けられるプリント基板の
加工状態を示す平面図、第９図は同上の制御不能領域及
び垂直方向の広がりを求めるための説明図である。
Ａは赤外線式発信器、Ｌ Ｄ 、〜ＬＤ、ｏは赤外線発
光ダイオード、１はプリント基板である。
代理人 弁理士 石 １）艮 七
第１図
第２図
第３図
第４図
第９図Fig. 1 is a perspective view showing the arrangement of infrared light emitting diodes used in an embodiment of the present invention, Fig. 2(a) is a plan view showing the arrangement in the same room, and Fig. 2(l) is Figure 2 (,) is a side view, Figures 3 and 4 are explanatory diagrams showing the results of measuring the light emitting characteristics of the infrared light emitting diode used in the above, and Figure f55 is the horizontal light projection of the infrared light emitting diode. An explanatory diagram showing the state, Fig. 6 is an explanatory diagram showing the projection angle of the vertical force direction of the infrared light emitting diode, Fig. 7 is a side view showing the processing state of the infrared light emitting diode, and fpJ8 figure is an infrared light emitting diode installed. FIG. 9 is a plan view showing the processing state of the printed circuit board, and is an explanatory diagram for determining the uncontrollable area and the vertical spread of the same as above. A is an infrared transmitter, LD, to LD, o are infrared light emitting diodes, and 1 is a printed circuit board. Agent Patent Attorney Ishi 1) Ai 7 Figure 1 Figure 2 Figure 3 Figure 4 Figure 9
Claims (1)
投光指向性の略半値角だけ異ならせてプリント基板上に
配設し、駆動回路にてすべての赤外線発光ダイオードを
同時に発光して成る赤外線式発信器。(1) A plurality of infrared light emitting diodes are arranged on a printed circuit board with their light emitting directions different by approximately the half angle of the light emitting directivity, and all the infrared light emitting diodes emit light at the same time using a drive circuit. An infrared transmitter consisting of
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60211305A JPS6271342A (en) | 1985-09-25 | 1985-09-25 | Infrared ray type transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60211305A JPS6271342A (en) | 1985-09-25 | 1985-09-25 | Infrared ray type transmitter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6271342A true JPS6271342A (en) | 1987-04-02 |
| JPH0418727B2 JPH0418727B2 (en) | 1992-03-27 |
Family
ID=16603741
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60211305A Granted JPS6271342A (en) | 1985-09-25 | 1985-09-25 | Infrared ray type transmitter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6271342A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0291591A (en) * | 1988-09-29 | 1990-03-30 | Yamatake Honeywell Co Ltd | Photoelectric sensor |
| JPH02186847A (en) * | 1988-11-14 | 1990-07-23 | Photonics Corp | Infrared network-transceiver device |
| US5243430A (en) * | 1991-07-24 | 1993-09-07 | Mitsubishi Electronics America, Inc. | Remote control apparatus and method for omnidirectional signal transmission |
| US5808769A (en) * | 1995-12-29 | 1998-09-15 | International Business Machines Corporation | Combination diffused and directed infrared transceiver |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56134858U (en) * | 1980-03-12 | 1981-10-13 | ||
| JPS6068738U (en) * | 1983-10-15 | 1985-05-15 | 株式会社富士通ゼネラル | remote control transmitter |
-
1985
- 1985-09-25 JP JP60211305A patent/JPS6271342A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56134858U (en) * | 1980-03-12 | 1981-10-13 | ||
| JPS6068738U (en) * | 1983-10-15 | 1985-05-15 | 株式会社富士通ゼネラル | remote control transmitter |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0291591A (en) * | 1988-09-29 | 1990-03-30 | Yamatake Honeywell Co Ltd | Photoelectric sensor |
| JPH02186847A (en) * | 1988-11-14 | 1990-07-23 | Photonics Corp | Infrared network-transceiver device |
| US5243430A (en) * | 1991-07-24 | 1993-09-07 | Mitsubishi Electronics America, Inc. | Remote control apparatus and method for omnidirectional signal transmission |
| US5808769A (en) * | 1995-12-29 | 1998-09-15 | International Business Machines Corporation | Combination diffused and directed infrared transceiver |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0418727B2 (en) | 1992-03-27 |
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