JPH0253204A - Voice magnetic recording and reproducing circuit - Google Patents
Voice magnetic recording and reproducing circuitInfo
- Publication number
- JPH0253204A JPH0253204A JP20188588A JP20188588A JPH0253204A JP H0253204 A JPH0253204 A JP H0253204A JP 20188588 A JP20188588 A JP 20188588A JP 20188588 A JP20188588 A JP 20188588A JP H0253204 A JPH0253204 A JP H0253204A
- Authority
- JP
- Japan
- Prior art keywords
- recording
- switch
- voltage
- amplifier
- turns
- 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.)
- Pending
Links
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/02—Control of operating function, e.g. switching from recording to reproducing
- G11B15/12—Masking of heads; circuits for Selecting or switching of heads between operative and inoperative functions or between different operative functions or for selection between operative heads; Masking of beams, e.g. of light beams
- G11B15/125—Masking of heads; circuits for Selecting or switching of heads between operative and inoperative functions or between different operative functions or for selection between operative heads; Masking of beams, e.g. of light beams conditioned by the operating function of the apparatus
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
- G11B5/027—Analogue recording
- G11B5/03—Biasing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/17—Construction or disposition of windings
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、音声信号の磁気記録再生回路に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic recording and reproducing circuit for audio signals.
（従来の技術）
近年、電子機器の低消費電力化のための回路の低電流化
、低電圧化が進んでいる。以下、図面を参照しながら従
来の音声磁気記録再生回路の一例について説明する。、
第３図は、従来の音声磁気記録再生回路における記録用
増幅器（以下、記録アンプという）、再生用増幅器（以
下、再生アンプという）、磁気記録再生ヘッドの接続関
係を示したものである。第３図において、１は記録アン
プで、その出力点１１を流れる信号電流を工１．電圧を
Ｖ工とする。２は記録電流調整用の抵抗器で、その抵抗
値をＲ工とする。(Prior Art) In recent years, in order to reduce the power consumption of electronic devices, the current and voltage of circuits have been reduced. An example of a conventional audio magnetic recording/reproducing circuit will be described below with reference to the drawings. FIG. 3 shows the connection relationship between a recording amplifier (hereinafter referred to as a recording amplifier), a reproduction amplifier (hereinafter referred to as a reproduction amplifier), and a magnetic recording and reproduction head in a conventional audio magnetic recording and reproduction circuit. In FIG. 3, 1 is a recording amplifier, and the signal current flowing through its output point 11 is processed by 1. The voltage is set to V. 2 is a resistor for adjusting the recording current, and its resistance value is R.
３は交流バイアス発振器、４は混合回路、５は記録再生
用磁気ヘッドで、その両端のインピーダンスをＺとする
。６は記録時開、再生時閉のスイッチ、７は記録時閉、
再生時間のスイッチ、８は再生アンプである。3 is an AC bias oscillator, 4 is a mixing circuit, and 5 is a recording/reproducing magnetic head, and the impedance at both ends thereof is Z. 6 is a switch that is open during recording and closed during playback, 7 is closed during recording,
A playback time switch 8 is a playback amplifier.
以上のように構成された従来の音声磁気記録再生回路に
ついて、以下その動作を説明する。The operation of the conventional audio magnetic recording and reproducing circuit configured as described above will be explained below.
まず、記録時の動作は以下の通りである。記録アンプ１
の出力に出てきた信号は、抵抗器２を介して混合回路４
に入力され、バイアス供給用の発振器３の出力と混合さ
れて磁気ヘッド５に供給される。この時、スイッチ６は
開、スイッチ７は閉の状態になっている。First, the operation during recording is as follows. Recording amplifier 1
The signal that appears at the output of is passed through resistor 2 to mixing circuit 4.
The signal is mixed with the output of the oscillator 3 for bias supply and supplied to the magnetic head 5. At this time, switch 6 is open and switch 7 is closed.
再生時の動作は以下の通りである。スイッチ６は閉、ス
イッチ７は開の状態になり、そして、テープ上の磁気の
変化を磁気ヘッド５が読み取り、そのコイルに発生した
電圧を再生アンプ８に供給し、電圧増幅を行なう。The operation during playback is as follows. The switch 6 is closed and the switch 7 is opened, and the magnetic head 5 reads the magnetic change on the tape and supplies the voltage generated in the coil to the reproduction amplifier 8 for voltage amplification.
（発明が解決しようとする課題）
しかしながら、上記従来の構成では、次のような問題が
ある。磁気記録の場合、再生の周波数特性、Ｓ／Ｎ、歪
等の必要性能上の観点からバイアス電流、信号記録電流
が最適値に決定されるが、これらは主に磁気ヘッド５の
インピーダンスにより決定される。従って、磁気ヘッド
５のインピーダンスとバイアス電流、信号電流が決定さ
れることにより、スイッチ６の端子６１にはある電圧が
発生する。記録が正しく行なわれるためには、スイッチ
６の端子６１．６２間の耐圧が、印加される電圧に耐え
ることが必要であり、所定の耐圧性能が要求される。(Problems to be Solved by the Invention) However, the above conventional configuration has the following problems. In the case of magnetic recording, the bias current and signal recording current are determined to optimal values from the viewpoint of required performance such as reproduction frequency characteristics, S/N, distortion, etc., but these are mainly determined by the impedance of the magnetic head 5. Ru. Therefore, by determining the impedance, bias current, and signal current of the magnetic head 5, a certain voltage is generated at the terminal 61 of the switch 6. In order to perform recording correctly, it is necessary that the voltage between the terminals 61 and 62 of the switch 6 withstand the applied voltage, and a predetermined voltage resistance is required.
また、信号に関しては、磁気ヘッド５のインピーダンス
をＺとして、信号電流Ｉ□が流れた時。Regarding the signal, when the impedance of the magnetic head 5 is Z, a signal current I□ flows.
Ｖｉ＝Ｉ、・（Ｒ，＋Ｚ）なる電圧が記録アンプ１の出
力点１１に発生する。磁気ヘッド５のインピーダンスＺ
が決定されると、前述の諸性能の確保の観点から最適電
流工□を流すために抵抗器２の抵抗値Ｒ１が決定され、
前記関係式より所定の電圧ｖ１が必要となる。しかるに
、記録アンプ１はその電源電圧によりｖｌが歪なく出力
される信号の大きさに限界がある。A voltage of Vi=I,·(R,+Z) is generated at the output point 11 of the recording amplifier 1. Impedance Z of magnetic head 5
is determined, the resistance value R1 of the resistor 2 is determined in order to flow the optimum current flow from the viewpoint of ensuring the various performances mentioned above,
According to the above relational expression, a predetermined voltage v1 is required. However, the recording amplifier 1 has a limit in the magnitude of the signal vl that can be outputted without distortion due to its power supply voltage.
次に、再生時には、磁気ヘッド５のコイル両端に発生す
る電圧は、テープ上の磁気レベルが一定であれば一定の
出力が得られる。ここで、再生時にコイルの巻数が変え
られるならば、その巻数に応じた出力が得られる。Next, during reproduction, the voltage generated across the coil of the magnetic head 5 provides a constant output if the magnetic level on the tape is constant. Here, if the number of turns of the coil can be changed during reproduction, an output corresponding to the number of turns can be obtained.
以上のように、スイッチ６の耐圧、記録アンプ１の電源
電圧、再生時出力レベル等の問題がある。As described above, there are problems such as the withstand voltage of the switch 6, the power supply voltage of the recording amplifier 1, and the output level during reproduction.
実際の回路においては、スイッチ６は電子的なものが多
く、その耐圧性能が重要であり、特にＩＣ化の場合、プ
ロセス上のネックになることが多い。In actual circuits, the switch 6 is often electronic, and its voltage resistance is important, and especially when integrated into an IC, this often becomes a bottleneck in the process.
また、記録アンプに関しては、ダイナミックレンジ確保
のために従来回路では低電圧化に限界がある。再生時出
力レベルにおいては、ヘッドのコイルの巻数が一定のた
め、再生アンプの設計はヘッドにより決定されてしまい
、自由度がない。Furthermore, regarding the recording amplifier, there is a limit to how low the voltage can be in conventional circuits in order to ensure a dynamic range. At the output level during reproduction, since the number of turns of the head coil is constant, the design of the reproduction amplifier is determined by the head, and there is no degree of freedom.
本発明は、上記従来の問題点に鑑み、バイアス電流を供
給するバイアス発振回路が接続される磁気ヘッドのコイ
ルの巻数と、信号電流を受は取る磁気ヘッドのコイルの
巻数とを変えることにより。In view of the above conventional problems, the present invention changes the number of turns of the coil of the magnetic head to which the bias oscillation circuit that supplies the bias current is connected and the number of turns of the coil of the magnetic head that receives and receives the signal current.
バイアス発振回路と信号出力の負荷となるコイルのイン
ピーダンスが異なり、設計上の自由度を増し、スイッチ
の低耐圧化、記録アンプのダイナミックレンジの向上（
または同一ダイナミックレンジでの低電圧化）および再
生出力の可変を図ることが可能になる。The impedance of the bias oscillation circuit and the coil that serves as the signal output load are different, increasing the degree of freedom in design, lowering the withstand voltage of the switch, and improving the dynamic range of the recording amplifier (
(or lower voltage within the same dynamic range) and variable reproduction output.
（課題を解決するための手段）
上記問題点を解決するために１本発明の音声磁気記録再
生回路は、磁気ヘッドのコアに巻かれたコイルの巻数を
Ｎ、、 Ｎ、としくＮ、≠ＮＳ）、一方を交流バイアス
回路、他方を信号回路にそれぞれ接続する構成としたも
のである。この時、Ｎユ〉Ｎ２ならば、Ｎ２はＮ８の巻
数の途中から中間タップとして取り出すことも可能であ
る。また、再生時、再生アンプと磁気ヘッドの接続は、
従来例では同一端子、すなわちＮ２となるが、スイッチ
を設けることにより、Ｎ１と再生アンプ入力を接続して
、再生信号レベルを上げることも可能にする。(Means for Solving the Problems) In order to solve the above-mentioned problems, the audio magnetic recording/reproducing circuit of the present invention has the number of turns of the coil wound around the core of the magnetic head as N, N, and N,≠ NS), one side is connected to an AC bias circuit and the other side is connected to a signal circuit. At this time, if N>N2, N2 can be taken out as an intermediate tap from the middle of the number of turns of N8. Also, during playback, the connection between the playback amplifier and the magnetic head is
In the conventional example, it is the same terminal, that is, N2, but by providing a switch, it is also possible to connect N1 and the reproduction amplifier input to increase the reproduction signal level.
（作 用）
本発明は、上記した構成により、スイッチの耐圧の低減
、記録アンプの電源電圧の低減（従来例に対し、同一ダ
イナミックレンジでの電源電圧の低電圧化、または同一
電源電圧での記録信号レベルのダイナミックレンジ拡大
）が達成され、特に音声磁気記録においては、記録アン
プ出力は数に七〜１０数ｋＨｚの周波数領域で数ｄＢ〜
１０数ｄＢのピーキング（１ｋＨｚに対し）がかけられ
ることが多く、記録アンプの電源電圧は、記録時のダイ
ナミックレンジに大きな影響を与える。(Function) With the above configuration, the present invention reduces the withstand voltage of the switch, reduces the power supply voltage of the recording amplifier (compared to the conventional example, lowers the power supply voltage in the same dynamic range, or lowers the power supply voltage in the same power supply voltage). In particular, in audio-magnetic recording, the recording amplifier output has increased from several dB to several dB in the frequency range of several 7 to 10-odd kHz.
Peaking of more than 10 dB (relative to 1 kHz) is often applied, and the power supply voltage of the recording amplifier has a large effect on the dynamic range during recording.
（実施例）
以下、本発明の実施例の音声磁気記録再生回路について
図面を参照しながら説明する。(Embodiment) Hereinafter, an audio magnetic recording/reproducing circuit according to an embodiment of the present invention will be described with reference to the drawings.
第１図は、本発明の一実施例を示したものであり、１は
記録アンプ、２は信号記録電流調整用抵抗器、３・はバ
イアス発振器、５は磁気ヘッド、６および７はスイッチ
、８は再生アンプである。５１゜５２、５３は磁気ヘッ
ド５のコイルの端子を示し、端子５１はバイアス発振器
３．端子５２は信号ライン、端子５３は再生アンプ８に
それぞれ接続されている。FIG. 1 shows an embodiment of the present invention, in which 1 is a recording amplifier, 2 is a resistor for adjusting a signal recording current, 3 is a bias oscillator, 5 is a magnetic head, 6 and 7 are switches, 8 is a reproduction amplifier. 51, 52 and 53 indicate terminals of the coil of the magnetic head 5, and the terminal 51 is connected to the bias oscillator 3. The terminal 52 is connected to the signal line, and the terminal 53 is connected to the reproduction amplifier 8.
スイッチ６は記録時開、再生時閉となり、スイッチ７は
記録時閉、再生時開となる。記録アンプ１の出力点１１
の信号電圧をｖ２．抵抗器２を流れる記録電流をＩ２、
磁気ヘッド５のコイルの端子５１〜５３間のインピーダ
ンスをＺい巻数をＮい端子５２〜５３間のインピーダン
スをＺｌ、巻数をＮ８とする。端子５１〜５３間のバイ
アスによる電圧をＶ、とする。説明が理解し易いように
、本実施例ではＮ１＝ ２ Ｎ、、すなわち全巻数の半
分の巻数部分にタップを引き出し、これに記録アンプ１
を接続する。この時、ｚ、＝−！−ｚ１である。端子５
１〜５３間の° ２
インダクタンスをＬとすると、Ｚ、＝、）ωＬ。The switch 6 is open during recording and closed during reproduction, and the switch 7 is closed during recording and open during reproduction. Output point 11 of recording amplifier 1
The signal voltage of v2. The recording current flowing through resistor 2 is I2,
The impedance between the terminals 51 to 53 of the coil of the magnetic head 5 is Z, the number of turns is N, the impedance between the terminals 52 to 53 is Z1, and the number of turns is N8. It is assumed that the voltage due to the bias between the terminals 51 to 53 is V. To make the explanation easier to understand, in this embodiment, a tap is drawn out at N1 = 2 N, that is, half the number of turns of the total number of turns, and the recording amplifier 1 is connected to this tap.
Connect. At this time, z, =-! −z1. terminal 5
Let L be the ° 2 inductance between 1 and 53, then Z, =, )ωL.
ｚ、＝よｊωＬとなる。z,=yojωL.
以上のように構成された本実施例について、従来例（第
３図）の回路と比較しながら、その動作を説明する。The operation of this embodiment configured as described above will be explained while comparing it with the circuit of the conventional example (FIG. 3).
従来例の磁気ヘッド５のコイル巻数およびインダクタン
スと、本実施例の端子５１〜５３間巻数およびインダク
タンスが等しいとすると、バイアス発生回路より供給さ
れる電流により、端子５１〜５３間には従来例と同じだ
けの電圧が印加され、それはｖあである。これにより、
スイッチ６の端子６１゜６２、間に発生する電圧は２
Ｖ ｂとなる。Assuming that the number of coil turns and inductance of the magnetic head 5 of the conventional example is equal to the number of turns and inductance between the terminals 51 to 53 of this embodiment, the current supplied from the bias generation circuit causes a difference between the terminals 51 and 53 compared to the conventional example. The same amount of voltage is applied, which is va. This results in
The voltage generated between terminals 61 and 62 of switch 6 is 2
It becomes Vb.
次に、信号電流としては、磁気ヘッド５に対しテープ上
に従来例と同じレベルで記録させるには、コアを通る磁
束が同一でなければならないことと。Next, as for the signal current, in order for the magnetic head 5 to record on the tape at the same level as in the conventional example, the magnetic flux passing through the core must be the same.
信号電流用巻線が従来例に比べて半分になっていること
から、２倍の電流が必要になる。端子５２〜５３間のイ
ンダクタンスは従来例の半分となっているから、記録ア
ンプ１の出力は従来例と同じｖ、＝ｖ、とじておけば、
Ｒ，＝ＬＲ１となるように抵抗器２の抵抗値Ｒ２を設
定すればＩ、＝２１．となり、テープ上に同じレベルの
記録が可能となる。Since the signal current winding is halved compared to the conventional example, twice as much current is required. Since the inductance between the terminals 52 and 53 is half that of the conventional example, if the output of the recording amplifier 1 is set to v, which is the same as the conventional example, = v, then
If the resistance value R2 of resistor 2 is set so that R,=LR1, then I,=21. This makes it possible to record at the same level on tape.
この場合、スイッチ６の耐圧は１／２に軽減できる。In this case, the withstand voltage of the switch 6 can be reduced to 1/2.
第２図は、本発明の他の実施例を示したもので、再生ヘ
ッドのコイル切換を可能にした例である。FIG. 2 shows another embodiment of the present invention, which is an example in which the coils of the reproducing head can be switched.
第１図と同一符号のものは同一のものを示し、また、９
はコイル切換用のスイッチである。そこで、記録時には
切換スイッチ９の端子９２と９４を接続し、再生時には
端子９１と９４を接続するようにすれば。Items with the same symbols as in Figure 1 indicate the same items, and 9
is a switch for switching coils. Therefore, the terminals 92 and 94 of the selector switch 9 should be connected during recording, and the terminals 91 and 94 should be connected during playback.
再生時には記録時の２倍のインダクタンスとなるため、
２倍の出力が再生アンプの入力に得られる。During playback, the inductance is twice as high as during recording, so
Twice the output is available at the input of the regenerative amplifier.
従って、第３図の従来例と同じ信号電流を流すと、テー
プ上には従来例の１７２のレベルで記録されるが、■□
も従来例のＶ□に対して１／２で済む。Therefore, if the same signal current as in the conventional example shown in Fig. 3 is applied, it will be recorded on the tape at the level 172 of the conventional example, but ■□
Also, V□ of the conventional example is only 1/2.
このことから、同一ダイナミックレンジを確保するには
、記録アンプの電源も１／２で済む、そして、１／２の
レベルでテープ上に記録された信号は、再生時に切換用
スイッチ９の切換を行なうことで、再生アンプの入力に
は同一のレベルで再生することが可能となる。From this, in order to ensure the same dynamic range, the power supply for the recording amplifier can be reduced to 1/2, and signals recorded on the tape at 1/2 the level require switching of the changeover switch 9 during playback. By doing so, it becomes possible to reproduce the same level at the input of the reproduction amplifier.
（発明の効果）
以上のように１本発明によれば、記録時における録再切
換のためのスイッチの耐圧を大幅に低減することができ
、これを半導体化、ＩＣ化する時。(Effects of the Invention) As described above, according to the present invention, the withstand voltage of the switch for recording/reproducing switching during recording can be significantly reduced, and when this is implemented as a semiconductor or an IC.
性能面、コスト面で大きなメリットとなる。また、記録
アンプの電源電圧が低減でき、前記スイッチの耐圧をも
含めて低消費電力化、低電圧化といった効果を得ること
ができる。This has major advantages in terms of performance and cost. Further, the power supply voltage of the recording amplifier can be reduced, and effects such as lower power consumption and lower voltage can be obtained including the withstand voltage of the switch.
第１図は１本発明の一実施例の構成図、第２図は、本発
明の他の実施例の構成図、第３図は、従来例の構成図で
ある。
１・・・記録アンプ、 ３・・・バイアス発振器、５・
・・磁気ヘッド、 ６，７・・・スイッチ。
８・・・再生アンプ、 ９・・・切換用スイッチ。
特許出願人 松下電器産業株式会社
第
図
第
図
第
図FIG. 1 is a block diagram of one embodiment of the present invention, FIG. 2 is a block diagram of another embodiment of the present invention, and FIG. 3 is a block diagram of a conventional example. 1... Recording amplifier, 3... Bias oscillator, 5.
...magnetic head, 6,7...switch. 8... Reproduction amplifier, 9... Selector switch. Patent applicant: Matsushita Electric Industrial Co., Ltd.
Claims (1)
ッドに記録信号を供給する記録用増幅器と、再生時に前
記磁気記録再生ヘッドの再生信号を増幅する再生用増幅
器と、前記磁気記録再生ヘッドに交流バイアスを与える
バイアス回路とを備え、前記磁気記録再生ヘッドはＮ＿
１ターンのコイルとＮ＿２ターンのコイルとを有し、一
方のコイルに前記バイアス回路を、他方のコイルに前記
記録用増幅器をそれぞれ接続してなることを特徴とする
音声磁気記録再生回路。a magnetic recording and reproducing head; a recording amplifier that supplies a recording signal to the magnetic recording and reproducing head during recording; a reproducing amplifier that amplifies the reproduced signal of the magnetic recording and reproducing head during reproduction; and an AC bias for the magnetic recording and reproducing head. and a bias circuit that gives N_
1. An audio magnetic recording/reproducing circuit comprising a 1-turn coil and an N_2-turn coil, wherein one coil is connected to the bias circuit and the other coil is connected to the recording amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20188588A JPH0253204A (en) | 1988-08-15 | 1988-08-15 | Voice magnetic recording and reproducing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20188588A JPH0253204A (en) | 1988-08-15 | 1988-08-15 | Voice magnetic recording and reproducing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0253204A true JPH0253204A (en) | 1990-02-22 |
Family
ID=16448459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20188588A Pending JPH0253204A (en) | 1988-08-15 | 1988-08-15 | Voice magnetic recording and reproducing circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0253204A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008301662A (en) * | 2007-06-01 | 2008-12-11 | Panasonic Electric Works Co Ltd | Control panel device |
| JP2008301661A (en) * | 2007-06-01 | 2008-12-11 | Panasonic Electric Works Co Ltd | Control panel device |
-
1988
- 1988-08-15 JP JP20188588A patent/JPH0253204A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008301662A (en) * | 2007-06-01 | 2008-12-11 | Panasonic Electric Works Co Ltd | Control panel device |
| JP2008301661A (en) * | 2007-06-01 | 2008-12-11 | Panasonic Electric Works Co Ltd | Control panel device |
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