JP4882051B2

JP4882051B2 - Remote control transmitter

Info

Publication number: JP4882051B2
Application number: JP2005081833A
Authority: JP
Inventors: 靖貴片岡; 純一山川; 豊蔵満
Original assignee: SMK Corp
Current assignee: SMK Corp
Priority date: 2005-03-22
Filing date: 2005-03-22
Publication date: 2012-02-22
Anticipated expiration: 2025-03-22
Also published as: JP2006270213A

Description

この発明は、テレビ等のＡＶ機器や、エアコン等の電気製品をリモートコントロールするために赤外線パルス信号を送信するリモコン送信機に関する。 The present invention relates to a remote control transmitter that transmits an infrared pulse signal to remotely control an AV device such as a television and an electric product such as an air conditioner.

従来、テレビ等を操作するリモコン送信機は、所望の操作の入力手段である押しボタンと、この押しボタンからの信号が入力されると、所定の制御信号を出力する制御回路とを備えている。制御回路は、ＩＣ化されてリモコン送信器内に収納され、所定の押しボタン操作があると、所定のパルス信号を受信機に向けて送信する。そして、受信機には、赤外線受けるフォトトランジスタが設けられ、送信機からの赤外線パルス信号に基づいて、所定の制御や操作を行う。 2. Description of the Related Art Conventionally, a remote control transmitter that operates a television or the like includes a push button that is an input unit for a desired operation, and a control circuit that outputs a predetermined control signal when a signal from the push button is input. . The control circuit is integrated into an IC and stored in the remote control transmitter, and when a predetermined push button operation is performed, a predetermined pulse signal is transmitted to the receiver. The receiver is provided with a phototransistor that receives infrared rays, and performs predetermined control and operation based on the infrared pulse signal from the transmitter.

リモコン送信機から発信される赤外線による制御パルス信号は、特許文献１、２等に開示されているように、信号照射の意図を受信機側に知らせるために、信号の頭にヘッダー部またはガイドパルスといわれる信号部があり、この後データコード等の制御データ部のパルス信号が送られる。 As disclosed in Patent Documents 1 and 2 and the like, the control pulse signal by infrared rays transmitted from the remote control transmitter is a header or guide pulse at the head of the signal in order to inform the receiver of the intention of signal irradiation. After that, a pulse signal of a control data portion such as a data code is sent.

また、ワイヤレスのリモコン送信機は駆動電源として乾電池や充電池等の直流電源を備え、赤外線信号を出力する赤外ＬＥＤは、赤外線の到達距離を稼ぐために光量を大きくする必要があり、赤外ＬＥＤに流す電流は抵抗で調整するとともに、電解コンデンサ等を電源と並列に組み込み赤外ＬＥＤの駆動電流を補っている。さらに、このコンデンサにより、赤外ＬＥＤに供給される電流の変動を吸収し、制御回路へのノイズやリプル変動を吸収し印加電圧変動を抑えている。
特開平７−３８９８０号公報特開平１１−２８５０８６号公報特開平２００３−２４３７１１号公報 In addition, the wireless remote control transmitter has a DC power source such as a dry battery or a rechargeable battery as a driving power source, and an infrared LED that outputs an infrared signal needs to increase the amount of light in order to increase the infrared reach distance, The current flowing through the LED is adjusted by resistance, and an electrolytic capacitor or the like is incorporated in parallel with the power source to supplement the drive current of the infrared LED. Furthermore, this capacitor absorbs fluctuations in the current supplied to the infrared LED, absorbs noise and ripple fluctuations in the control circuit, and suppresses fluctuations in the applied voltage.
JP-A-7-38980 JP-A-11-285086 Japanese Unexamined Patent Publication No. 2003-243711

上記従来の技術の場合、コンデンサを電源と並列に組み込んだとしても、送信機からの信号の送信当初とその後の段階では、赤外ＬＥＤに流れる信号パルス電流に差が生じていた。即ち、図４の信号構成図、及び図５の拡大図に示すように、コンデンサへの充電により、各信号コード毎に送信当初のパルス信号電圧が最も高くなりその後漸減し、コンデンサの充放電が平衡状態になると安定する。従って、信号の送信当初とその後では赤外線の光量に差が生じ、受信機側では安定的に正確に受信できないという問題があった。 In the case of the above conventional technique, even if a capacitor is incorporated in parallel with the power source, a difference occurs in the signal pulse current flowing through the infrared LED between the initial stage of signal transmission from the transmitter and the subsequent stage. That is, as shown in the signal configuration diagram of FIG. 4 and the enlarged view of FIG. 5, by charging the capacitor, the pulse signal voltage at the beginning of transmission becomes the highest for each signal code and then gradually decreases, and the capacitor is charged and discharged. Stable when in equilibrium. Accordingly, there is a difference in the amount of infrared light between the beginning and after transmission of the signal, and there is a problem that the receiver side cannot receive the signal stably and accurately.

この解決方法としては、コンデンサの容量を大きくすることにより、変動の少ない信号を送ることができるが、コンデンサのスペースを多く必要とし、コストもかかるものである。また、電気二重層コンデンサを用いることによりスペースの増大はほとんど無いが、この場合もコストが上がるという問題があった。 As a solution to this problem, it is possible to send a signal with little fluctuation by increasing the capacitance of the capacitor, but it requires a lot of space for the capacitor and costs high. Further, the use of the electric double layer capacitor hardly increases the space, but in this case, there is a problem that the cost increases.

この発明は上記従来の技術の問題点に鑑みてなされたものであり、簡単な構成で、安定した制御信号を送ることができ、正確な受信を可能にするリモコン送信機を提供することを目的とする。 The present invention has been made in view of the above problems of the prior art, and an object thereof is to provide a remote control transmitter capable of transmitting a stable control signal with a simple configuration and enabling accurate reception. And

この発明は、電池等の直流電源と、この直流電源と並列に接続されたコンデンサを備え、前記直流電源に直列に接続された赤外ＬＥＤとその駆動素子を有し、操作部の操作に連動して、制御回路からの信号により前記駆動素子を駆動して前記赤外ＬＥＤから赤外線パルス信号を送信し、電気製品等の機器をリモートコントロールするリモコン送信機であって、前記コンデンサと並列にスイッチング回路を設け、前記制御回路は、前記赤外ＬＥＤの駆動素子に制御信号を送信する際に、その制御信号の送信直前に前記スイッチング回路に前記制御回路からダミーパルス信号を送るものであって、前記ダミーパルス信号は、前記制御信号である制御信号コード群のうちの所定の制御信号コード毎に、その発信直前に出力されるコード信号であり、前記ダミーパルス信号は、前記制御信号と同様の信号であり、前記制御信号コードの発信直前に前記コンデンサの充放電を行い、前記制御信号コードの送信動作時の前記コンデンサの出力を安定化させるものであるリモコン送信機である。 The present invention includes a direct current power source such as a battery and a capacitor connected in parallel with the direct current power source, and includes an infrared LED and a driving element connected in series to the direct current power source, and interlocks with an operation of an operation unit. A remote control transmitter for driving the drive element by a signal from a control circuit and transmitting an infrared pulse signal from the infrared LED to remotely control a device such as an electric product, and switching in parallel with the capacitor; provided circuit, the control circuit, in transmitting control signals to the driving element of the infrared LED, a shall send a dummy pulse signal from the control circuit to the switching circuit immediately before transmission of the control signal The dummy pulse signal is a code signal that is output immediately before transmission for each predetermined control signal code in the control signal code group that is the control signal, Serial dummy pulse signal, said a control signal similar to the signal, have rows charging and discharging of the capacitor in the outgoing immediately before the control signal code, to stabilize the output of the capacitor during the transmission operation of the control signal codes It is a remote control transmitter.

前記スイッチング回路は、前記コンデンサと並列に接続されたトランジスタを備え、このトランジスタのベースに、前記ダミーパルス信号を出力する前記制御回路のダミーパルス端子が接続されているものである。また、前記ダミーパルス信号は、前記制御回路である制御用ＩＣから出力されるコード信号である。 The switching circuit includes a transistor connected in parallel with the capacitor, and a dummy pulse terminal of the control circuit that outputs the dummy pulse signal is connected to a base of the transistor. The dummy pulse signal is a code signal output from a control IC that is the control circuit .

この発明のリモコン送信機は、常に安定した制御信号を送ることができ、受信機側では正確な受信を可能にし、正確で安定した制御が可能となる。しかも、構成が簡単でありコストもほとんどかからないものである。 The remote control transmitter of the present invention can always send a stable control signal, enables accurate reception on the receiver side, and enables accurate and stable control. In addition, the configuration is simple and the cost is low.

以下、この発明の実施の形態について図面に基づいて説明する。図１〜図３はこの発明の一実施形態を示すもので、この実施形態のリモコン送信機１０は、乾電池や充電電池等の直流電源１２と、この直流電源１２と並列に接続された電解コンデンサ等のコンデンサ１４を備える。直流電源１２の＋側端子には、直列に赤外ＬＥＤ１６のアノードが接続され、カソードは抵抗１８を介して、駆動素子であるｎｐｎ型のトランジスタ２０のコレクタに接続されている。このトランジスタ２０のエミッタは接地され、ベースは制御用ＩＣである制御回路２２の制御用端子に接続されている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 3 show an embodiment of the present invention. A remote control transmitter 10 of this embodiment includes a DC power source 12 such as a dry battery or a rechargeable battery, and an electrolytic capacitor connected in parallel with the DC power source 12. And the like. The anode of the infrared LED 16 is connected in series to the + side terminal of the DC power supply 12, and the cathode is connected to the collector of an npn transistor 20 as a driving element via a resistor 18. The emitter of the transistor 20 is grounded, and the base is connected to the control terminal of the control circuit 22 which is a control IC.

制御回路２２は、操作部である押しボタン等の操作ボタン２４に接続され、操作ボタン２４のオン−オフにより制御信号を出力する。 The control circuit 22 is connected to an operation button 24 such as a push button that is an operation unit, and outputs a control signal when the operation button 24 is turned on and off.

コンデンサ１４には、並列にスイッチング回路２６が接続されている。スイッチング回路２６は、ｎｐｎ型のトランジスタ３０を備え、コンデンサ１４の一端と直流電源１０の＋側端子に、抵抗２８を介してトランジスタ３０のコレクタが接続されている。このトランジスタ３０のエミッタは接地され、ベースは抵抗３２を介して、制御回路２２のダミーパルス端子に接続されている。 A switching circuit 26 is connected to the capacitor 14 in parallel. The switching circuit 26 includes an npn-type transistor 30, and the collector of the transistor 30 is connected to one end of the capacitor 14 and the + side terminal of the DC power supply 10 via a resistor 28. The emitter of the transistor 30 is grounded, and the base is connected to a dummy pulse terminal of the control circuit 22 via a resistor 32.

この実施形態のリモコン送信機１０の動作は、操作ボタン２４の押圧動作により、まず制御回路２２のダミーパルス端子からトランジスタ３０のベースに、ダミーパルス信号が送信される。ダミーパルス信号は、所定の操作ボタンの押圧により制御回路２２からトランジスタ２０へ送信される一連の制御信号である制御信号コード群の、各ヘッダー信号コード部、データコード部等の制御信号コード毎に、その発信直前に所定の短期間出力される。このダミーパルス信号は、制御信号とオン−オフ期間がほぼ等しいものである。これにより、所定の短期間コンデンサ１４の充放電を行わせ、コンデンサ１４の充放電を平衡状態にし、出力を安定化する。 In the operation of the remote control transmitter 10 of this embodiment, a dummy pulse signal is first transmitted from the dummy pulse terminal of the control circuit 22 to the base of the transistor 30 by the pressing operation of the operation button 24. The dummy pulse signal is generated for each control signal code such as each header signal code portion and data code portion of a control signal code group which is a series of control signals transmitted from the control circuit 22 to the transistor 20 by pressing a predetermined operation button. , It is output for a predetermined short period immediately before the transmission. This dummy pulse signal has substantially the same on-off period as the control signal. As a result, the capacitor 14 is charged and discharged for a predetermined short period, the charge and discharge of the capacitor 14 is balanced, and the output is stabilized.

この後、制御回路２２からトランジスタ２０のベースに、制御信号である赤外ＬＥＤ１６の駆動パルス信号が送られ、この駆動パルス信号はトランジスタ２０で増幅されて、赤外ＬＥＤ１６に駆動パルス電流を流す。これにより赤外ＬＥＤ１６から赤外線パルス信号が送信される。 Thereafter, a drive pulse signal of the infrared LED 16 as a control signal is sent from the control circuit 22 to the base of the transistor 20, and this drive pulse signal is amplified by the transistor 20, and a drive pulse current is passed through the infrared LED 16. Thereby, an infrared pulse signal is transmitted from the infrared LED 16.

この実施形態のリモコン送信機１０は、図２に示すように、操作ボタン２４の操作に伴う制御信号の送信に際して、所定の制御信号コード毎に先立って、制御回路２２からスイッチング回路２６のトランジスタ３０に、制御信号と同様のダミーパルス信号を送り、コンデンサ１４の充放電を制御信号の送信直前に行わせ、コンデンサ１４の出力を安定状態にし、その後、制御信号による制御パルス信号が出力される。従って、トランジスタ２０により駆動される赤外ＬＥＤ１６に流れる電流は、図３に示すように、コンデンサ１４の充放電が平衡状態であり安定しており、赤外ＬＥＤ１６の赤外光の強さがほぼ一定のものとなる。よって、安定した赤外ＬＥＤ１６の発光により確実な受信が可能となるものである。 As shown in FIG. 2, the remote control transmitter 10 of this embodiment, when transmitting a control signal accompanying the operation of the operation button 24, prior to every predetermined control signal code, from the control circuit 22 to the transistor 30 of the switching circuit 26. Then, a dummy pulse signal similar to the control signal is sent to charge / discharge the capacitor 14 immediately before the transmission of the control signal, the output of the capacitor 14 is stabilized, and then the control pulse signal based on the control signal is output. Therefore, as shown in FIG. 3, the current flowing through the infrared LED 16 driven by the transistor 20 is stable because the charging and discharging of the capacitor 14 is in an equilibrium state, and the intensity of the infrared light of the infrared LED 16 is almost equal. It will be constant. Therefore, reliable reception is possible by stable light emission of the infrared LED 16.

なお、この発明のリモコン送信機は、上記実施形態に限定されるものではなく、スイッチング回路の構成は適宜設定されるもので、赤外ＬＥＤの駆動素子も適宜選択可能である。 Note that the remote control transmitter of the present invention is not limited to the above embodiment, the configuration of the switching circuit is set as appropriate, and the driving element of the infrared LED can be selected as appropriate.

この発明の一実施形態のリモコン送信機の概略回路図である。It is a schematic circuit diagram of the remote control transmitter of one Embodiment of this invention. この実施形態のリモコン送信機の制御信号を示す概略図である。It is the schematic which shows the control signal of the remote control transmitter of this embodiment. この実施形態の制御信号の拡大パルス波形図である。It is an expansion pulse waveform figure of the control signal of this embodiment. 従来のリモコン送信機の制御信号を示す信号構成図である。It is a signal block diagram which shows the control signal of the conventional remote control transmitter. 従来の制御信号の拡大パルス波形図である。It is an enlarged pulse waveform diagram of a conventional control signal.

Explanation of symbols

１０リモコン送信機
１２直流電源
１４コンデンサ
１６赤外ＬＥＤ
１８，２８抵抗
２０，３０トランジスタ
２２制御回路
２４操作ボタン
２６スイッチング回路
10 Remote control transmitter 12 DC power supply 14 Capacitor 16 Infrared LED
18, 28 Resistance 20, 30 Transistor 22 Control circuit 24 Operation button 26 Switching circuit

Claims

A direct-current power supply and a capacitor connected in parallel with the direct-current power supply, and an infrared LED connected in series to the direct-current power supply and its drive element, and in conjunction with the operation of the operation unit, from the control circuit In a remote control transmitter for driving the drive element by a signal and transmitting an infrared pulse signal from the infrared LED,
A switching circuit is provided in parallel with the capacitor,
Wherein the control circuit, in transmitting control signals to the driving element of the infrared LED, a shall send a dummy pulse signal from the control circuit to the switching circuit immediately before the transmission of the control signal,
The dummy pulse signal is a code signal that is output immediately before transmission for each predetermined control signal code in the control signal code group that is the control signal,
The dummy pulse signal, said a control signal similar to the signal, have rows charging and discharging of the capacitor in the outgoing immediately before the control signal code, to stabilize the output of the capacitor during the transmission operation of the control signal codes A remote control transmitter characterized by being a thing.

The remote control transmitter according to claim 1, wherein the switching circuit includes a transistor connected in parallel with the capacitor, and a dummy pulse terminal of the control circuit that outputs the dummy pulse signal is connected to a base of the transistor. .

3. The remote control transmitter according to claim 1, wherein the dummy pulse signal is a code signal output from a control IC that is the control circuit .