JPH0416537Y2 - - Google Patents
Info
- Publication number
- JPH0416537Y2 JPH0416537Y2 JP10985484U JP10985484U JPH0416537Y2 JP H0416537 Y2 JPH0416537 Y2 JP H0416537Y2 JP 10985484 U JP10985484 U JP 10985484U JP 10985484 U JP10985484 U JP 10985484U JP H0416537 Y2 JPH0416537 Y2 JP H0416537Y2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- signal group
- television signal
- low
- output
- 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.)
- Expired
Links
- 230000010355 oscillation Effects 0.000 claims description 23
- 238000006243 chemical reaction Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 239000000969 carrier Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
Description
【考案の詳細な説明】
(産業上の利用分野)
本考案は、低域と高域のテレビ信号群を所定の
空きチヤンネルを介して周波数配置し、低域のテ
レビ信号の映像及び音声搬送波が高域に対し逆配
置されるマルチデイストリビユーシヨンサービス
網として知られたテレビ信号を受信して中間周波
数信号に変換する周波数変換器に関する。[Detailed description of the invention] (Field of industrial application) This invention arranges frequencies of low-frequency and high-frequency television signals via predetermined empty channels, and the video and audio carrier waves of the low-frequency television signals are The present invention relates to a frequency converter that receives a television signal known as a multi-distribution service network arranged inversely to a high frequency band and converts it into an intermediate frequency signal.
(従来技術)
従来、マルチデイストリビユーシヨンサービス
(MDS)として知られたテレビネツトワークで
は、2〜3GHz帯の周波数を使用し、CATVシス
テムに代わるサービス網として実用化されてい
る。(Prior Art) A television network conventionally known as multi-distribution service (MDS) uses frequencies in the 2 to 3 GHz band and has been put into practical use as a service network to replace the CATV system.
第3図は、このMDSで使用されるテレビ信号
の周波数配置を示したもので、低域テレビ信号群
として2150〜2162MHzに1,2チヤンネを割当
て、この低域テレビ信号群に対し所定の空きチヤ
ンネル(2162〜2500MHz)を介して2500〜2886M
Hzの間に高域テレビ信号群として31チヤンネルを
割当てている。 Figure 3 shows the frequency allocation of the television signals used in this MDS. 1 and 2 channels are allocated from 2150 to 2162 MHz as the low-frequency television signal group, and a predetermined free space is allocated to this low-frequency television signal group. 2500~2886M via channel (2162~2500MHz)
31 channels are allocated as a group of high-frequency television signals between Hz.
ところで、高域テレビ信号群の各チヤンネルに
おける音声および映像搬送波の周波数配置は、
VHF、UHFと同様に6MHz帯で映像搬送波
1.25MHz、音声搬送波5.75MHzであるが、低域テ
レビ信号群の各チヤンネルでは、逆に6MHzで映
像搬送波4.75MHz、音声搬送波0.25MHzと入れ代
つた信号配置としている。 By the way, the frequency arrangement of audio and video carrier waves in each channel of the high-frequency television signal group is as follows.
Video carrier wave in 6MHz band like VHF and UHF
1.25MHz, audio carrier 5.75MHz, but in each channel of the low-frequency TV signal group, the signal arrangement is reversed, with the video carrier 4.75MHz and the audio carrier 0.25MHz at 6MHz.
(考案が解決しようとする問題点)
しかしながら、このようなMDSによるテレビ
信号を受信して所定の中間周波数信号に変換する
する場合には、低域テレビ信号群と高域テレビ信
号群における映像および音声搬送波の配置が逆の
関係にあるため、低域と高域のそれぞれについて
独立した周波数変換器を設けなければならず、更
に中間周波数回路から音声及び映像検波までの回
路も低域と高域の専用回路を設けなければなら
ず、受信回路が複雑化し、テレビ受信機のコスト
も高価になるという問題があつた。(Problem to be solved by the invention) However, when receiving such MDS television signals and converting them into predetermined intermediate frequency signals, the video and video signals in the low frequency television signal group and the high frequency television signal group must be Since the arrangement of audio carrier waves is in an inverse relationship, separate frequency converters must be provided for each of the low and high frequencies, and the circuits from the intermediate frequency circuit to the audio and video detection also have separate frequency converters for the low and high frequencies. However, there were problems in that a dedicated circuit had to be provided for the TV, making the receiving circuit complicated and making the television receiver expensive.
(問題点を解決するための手段)
本考案は、このような従来の問題点に鑑みてな
されたもので、1または複数チヤンネルの低域テ
レビ信号群と高域テレビ信号群を所定の空きチヤ
ンネル幅をもつて周波数配置し、低域テレビ信号
群の映像搬送波及び音声搬送波が高域テレビ信号
群に対し逆配置され、この低域テレビ信号群およ
び高域テレビ信号群を所定の中間周波数信号に変
換する周波数変換器に於いて、低域テレビ信号群
の上限周波数より高く且つ高域テレビ信号群の下
限周波数より低い所定の発振周波数を有する局部
発振器と、低域テレビ信号及び高域テレビ信号と
局部発振器の出力とを混合する混合器と、この混
合器の出力のうち差信又は和号を出力する出力回
路とを設け、単一の局部発振周波数の設定で搬送
波の配置が逆の関係にある低域と高域のテレビ信
号群を周波数変換し、且つ低域テレビ信号群の搬
送波配置を反転して高域の搬送波配置に一致させ
るようにしたものである。(Means for Solving the Problems) The present invention has been made in view of the above-mentioned problems in the prior art. The video carrier wave and audio carrier wave of the low frequency television signal group are arranged inversely to the high frequency television signal group, and the low frequency television signal group and the high frequency television signal group are converted into a predetermined intermediate frequency signal. In the frequency converter for converting, a local oscillator having a predetermined oscillation frequency higher than the upper limit frequency of the low frequency television signal group and lower than the lower limit frequency of the high frequency television signal group; A mixer that mixes the output of the local oscillator and an output circuit that outputs the difference signal or sum signal of the output of this mixer are provided, and the arrangement of carrier waves is reversed by setting a single local oscillation frequency. A certain low-frequency and high-frequency television signal group is frequency-converted, and the carrier wave arrangement of the low-frequency television signal group is inverted to match the carrier wave arrangement of the high frequency band.
(実施例)
第1図は本考案の一実施例を示した回路ブロツ
ク図である。(Embodiment) FIG. 1 is a circuit block diagram showing an embodiment of the present invention.
まず構成を説明すると、1は混合回路であり、
MDSテレビ放送で送信された1又は複数チヤン
ネルの高域テレビ信号群の受信信号を入力する第
1の入力端子2と、1又は複数チヤンネルの低域
テレビ信号群を入力する第2の入力端子3を有す
る。高域テレビ信号群が入力する第1の入力端子
2はバンドパスフイルタ4に入力接続され、この
バンドパスフイルタ4は高域テレビ信号群のチヤ
ンネル帯域となる、例えば2500〜2686MHzのテレ
ビ信号を通過する帯域特性をもつ。一方、低域テ
レビ信号群が入力される第2の入力端子3はバン
ドパスフイルタ5に接続され、バンドパスフイル
タ5は低域テレビ信号群のチヤンネル帯域とな
る。例えば2150〜2162MHzのテレビ信号の通過帯
域特性を有する。バンドパスフイルタ4の出力は
コンデンサC1,C2及びインダクタンスL1で
なるハイパスフイルタを介してアンプ6に入力接
続され、またバンドパスフイルタ5の出力はイン
ダクタンスL2,L3及びコンデンサC3でなる
ローパスフイルタを介して同じくアンプ6に入力
接続され、アンプ6より高域テレビ信号群と低域
テレビ信号群を加え合せた出力を得る。アンプ6
の出力は周波数変換を行なう混合器7の一方に入
力接続され、混合器7の他方には局部発振器8の
発振出力が与えられている。 First, to explain the configuration, 1 is a mixed circuit,
A first input terminal 2 that inputs a received signal of a group of high-frequency television signals of one or more channels transmitted by MDS television broadcasting, and a second input terminal 3 that inputs a group of low-frequency television signals of one or more channels. has. A first input terminal 2 into which a group of high-frequency television signals is input is connected as an input to a bandpass filter 4, and this bandpass filter 4 passes television signals of, for example, 2500 to 2686MHz, which are the channel band of the high-frequency television signal group. It has a band characteristic that On the other hand, the second input terminal 3 into which the low frequency television signal group is input is connected to a bandpass filter 5, and the bandpass filter 5 serves as a channel band for the low frequency television signal group. For example, it has passband characteristics of a television signal of 2150 to 2162 MHz. The output of the band-pass filter 4 is connected to the amplifier 6 via a high-pass filter consisting of capacitors C1, C2 and an inductance L1, and the output of the band-pass filter 5 is connected via a low-pass filter consisting of inductances L2, L3 and a capacitor C3. Similarly, the input signal is connected to an amplifier 6, and an output is obtained from the amplifier 6, which is a combination of a high-frequency television signal group and a low-frequency television signal group. Amplifier 6
The output of the mixer 7 is inputted to one side of the mixer 7 which performs frequency conversion, and the oscillation output of the local oscillator 8 is given to the other side of the mixer 7.
ここで、局部発振器8の発振周波数foは次のよ
うに定められる。 Here, the oscillation frequency fo of the local oscillator 8 is determined as follows.
第2図は第1図の実施例における低域及び高域
テレビ信号群に対する局部発振周波数foの設定を
示したもので、低域テレビ信号群における上限周
波数を2162MHz、高域テレビ信号群における下限
周波数を2600MHzとした場合、局部発振周波数fo
は低域テレビ信号群の上限周波数2162MHzより大
きく、且つ高域テレビ信号群の下限周波数2600M
Hzより小さい所定の値に定められる。更に詳細に
説明するならば、局部発振周波数foに対する低域
及び高域テレビ信号群の上限及び下限周波数との
差をf1,f2とした場合、f1<f2となるように局部
発振周波数foを定め、従つて、f1=f2+Δfとな
り、このΔfは周波数変換したときの低域と高域
の混信を避けるための空チヤンネルを与え、例え
ば2チヤンネル分に相当するΔf=12MHzとする。 Figure 2 shows the setting of the local oscillation frequency fo for the low-frequency and high-frequency television signal groups in the embodiment shown in Figure 1. When the frequency is 2600MHz, the local oscillation frequency fo
is higher than the upper limit frequency of 2162MHz for the low frequency TV signal group, and the lower limit frequency of the high frequency TV signal group is 2600M
It is set to a predetermined value smaller than Hz. To explain in more detail, if the difference between the local oscillation frequency fo and the upper and lower limit frequencies of the low-frequency and high-frequency television signal groups is f1 and f2, the local oscillation frequency fo is determined so that f1<f2. , Therefore, f1=f2+Δf, and this Δf gives an empty channel to avoid interference between low and high frequencies when converting the frequency, and for example, Δf corresponding to two channels is set to 12 MHz.
このような局部発振周波数foによれば、例えば
局部発振周波数fo=2284MHzに設定される。 According to such a local oscillation frequency fo, the local oscillation frequency fo is set to 2284 MHz, for example.
この局部発振周波数fo=2284MHzを得るため第
1図の局部発振器8においては、まず水晶発振器
9で114.2MHzの源振出力を取り出し、逓倍器1
0で高調波抽出により4倍に逓倍してバンドパス
フイルタ11より456.8MHzの発振出力を取り出
し、更に逓倍器12で5倍に逓倍してバンドパス
フイルタ13より局部発振周波数fo=2284MHzを
取り出し、混合器7に出力している。 In order to obtain this local oscillation frequency fo = 2284 MHz, in the local oscillator 8 in Fig. 1, the crystal oscillator 9 first takes out the source oscillation output of 114.2 MHz, and the multiplier 1
0, the frequency is multiplied by 4 times by harmonic extraction and an oscillation output of 456.8MHz is taken out from the bandpass filter 11, and further multiplied by 5 times by the multiplier 12, and the local oscillation frequency fo=2284MHz is taken out from the bandpass filter 13. It is output to mixer 7.
従つて、混合器7ではアンプ6より与えられる
低域と高域テレビ信号に周波数foの局部発振出力
を混合し、この混合により周波数変換された信号
を次段の出力回路14に与えている。 Therefore, the mixer 7 mixes the local oscillation output of the frequency fo with the low-frequency and high-frequency television signals provided by the amplifier 6, and provides a frequency-converted signal by this mixing to the output circuit 14 at the next stage.
出力回路14はバンドパスフイルタ16、アン
プ17,18、及び直流カツト用のコンデンサC
4を備え、出力端子19から周波数変換された信
号を取り出している。この出力回路14におい
て、バンドパスフイルタ16は混合器7の混合出
力の内の差信号を取り出す通過帯域特性を有し、
局部発振周波数をfo=2284MHzとした場合には
122〜402MHzの通過帯域特性を設定している。 The output circuit 14 includes a bandpass filter 16, amplifiers 17 and 18, and a capacitor C for cutting DC.
4, and a frequency-converted signal is taken out from an output terminal 19. In this output circuit 14, a bandpass filter 16 has a passband characteristic for extracting a difference signal from the mixed output of the mixer 7,
When the local oscillation frequency is fo=2284MHz,
The passband characteristics are set from 122 to 402MHz.
次に、第1図の実施例による周波数変換を第2
図の信号周波数配置図を参照して説明する。 Next, the frequency conversion according to the embodiment of FIG.
This will be explained with reference to the signal frequency allocation diagram shown in the figure.
まず、第1の入力端子2には2600〜2686MHzの
チヤンネル帯域をもつ31チヤンネル分の高域テレ
ビ信号群が入力し、バンドパスフイルタ4及び次
段のハイパスフイルタによつて高域テレビ信号群
のみが抽出される。また、第2の入力端子3には
2150〜2162MHzのチヤンネル周波数帯域をもつ低
域テレビ信号群が入力され、バンドパスフイルタ
5及びローパスフイルタによつて低域テレビ信号
群のみが抽出される。これらの高域テレビ信号群
及び低域テレビ信号群はアンプ6で加算増幅さ
れ、混合器7に入力される。混合器7には局部発
振器8より局部発振周波数fo=2284MHzの局部発
振出力が与えられているため、局部発振周波数fo
に対する低域及び高域テレビ信号群の和及び差信
号が周波数変換出力として得られる。このような
混合器7の周波数変換出力の内、出力回路14の
バンドパスフイルタ16は差信号の通過帯域特性
122〜402MHzをもつているため、出力端子19か
らは混合器7の出力の内の差信号のみが出力され
る。 First, 31 channels of high-frequency television signals having a channel band of 2600 to 2686 MHz are input to the first input terminal 2, and only the high-frequency television signal group is input by the bandpass filter 4 and the next high-pass filter. is extracted. Also, the second input terminal 3
A low frequency television signal group having a channel frequency band of 2150 to 2162 MHz is input, and only the low frequency television signal group is extracted by the bandpass filter 5 and the low pass filter. These high frequency television signal groups and low frequency television signal groups are summed and amplified by an amplifier 6 and input to a mixer 7. Since the mixer 7 is given a local oscillation output with a local oscillation frequency fo = 2284MHz from the local oscillator 8, the local oscillation frequency fo
The sum and difference signals of the low-frequency and high-frequency television signals are obtained as frequency conversion outputs. Of the frequency converted output of the mixer 7, the bandpass filter 16 of the output circuit 14 converts the passband characteristic of the difference signal.
Since it has a frequency of 122 to 402 MHz, only the difference signal among the outputs of the mixer 7 is output from the output terminal 19.
この出力端子19における周波数変換された差
信号は、第2図から明らかなように周波数変換前
の低域テレビ信号群を局部発振周波数foを中心に
折り返したチヤンネル配置となり、チヤンネル位
置が逆に入れ代わる。従つて、低域テレビ信号群
の各チヤンネルにおける映像及び音声搬送波が、
第3図に示したように高域テレビ信号群に対し逆
配置になつていても、周波数変換により低域テレ
ビ信号群のチヤンネル位置が入れ代わることで高
域テレビ信号群と全く同じ映像と音声搬送波の周
波数配置とすることができる。従つて、出力端子
19以降の回路部は、低域テレビ信号群及び高域
テレビ信号群について共通化できる。 As is clear from FIG. 2, the frequency-converted difference signal at the output terminal 19 has a channel arrangement in which the low-frequency television signal group before frequency conversion is folded back around the local oscillation frequency fo, and the channel positions are reversed. . Therefore, the video and audio carrier waves in each channel of the low frequency television signal group are
As shown in Figure 3, even if the channel position of the low-frequency television signal group is reversed to the high-frequency television signal group, the channel position of the low-frequency television signal group is swapped due to frequency conversion, so that the video and audio carriers are exactly the same as those of the high-frequency television signal group. frequency arrangement. Therefore, the circuit section after the output terminal 19 can be shared by the low frequency television signal group and the high frequency television signal group.
勿論、低域テレビ信号群と高域テレビ信号群を
所定の中間周波数に周波数変換する周波数変換器
についても局部発振器が1台で済み、低域と高域
に分けて周波数変換を行なう必要はない。 Of course, the frequency converter that converts the low frequency TV signal group and the high frequency TV signal group to a predetermined intermediate frequency requires only one local oscillator, and there is no need to perform frequency conversion separately for low frequency and high frequency bands. .
尚、上記の実施例はMDSで使用されるテレビ
信号を例にとるものであつたが、本考案はこれに
限定されず、所定の空チヤンネル幅を間に介して
1または複数のチヤンネルの高域信号群と低域テ
レビ信号群の周波数配置をもち、且つ一方のテレ
ビ信号群に対し他方のテレビ信号群における映像
及び音声搬送波か逆配置となる適宜のテレビ放送
の受信再生における周波数変換にそのまま適用す
ることができる。また、出力回路14のバンドパ
スフイルタ16を和信号の通過帯域特性とすれ
ば、和信号のみ出力することもできる。 Although the above embodiment takes the television signal used in MDS as an example, the present invention is not limited to this. It is possible to directly apply frequency conversion in the reception and playback of appropriate television broadcasts that have the frequency allocation of a low-frequency television signal group and a low-frequency television signal group, and the video and audio carrier waves of one television signal group are reversely allocated to the other television signal group. Can be applied. Further, if the bandpass filter 16 of the output circuit 14 has a passband characteristic of the sum signal, only the sum signal can be output.
(考案の効果)
以上説明してきたように本考案によれば、1ま
たは複数チヤンネルの低域テレビ信号群と高域テ
レビ信号群を所定の空チヤンネル幅をもつて周波
数配置し、低域テレビ信号群の映像搬送波及び音
声搬送波が高域テレビ信号群に対し逆配置され、
低域テレビ信号群及び高域テレビ信号群を所定の
中間周波数信号に変換する周波数変換器におい
て、低域テレビ信号群の上限周波数より高く且つ
高域テレビ信号群の下限周波数より低い所定の発
振周波数を有する局部発振器と、低域テレビ信号
群または高域テレビ信号群と局部発振器の出力と
を混合する混合器と、この混合器出力の内の差ま
たは和信号を出力する出力回路とを設けたため、
高域テレビ信号群に対し低域テレビ信号群の映像
及び搬送波の周波数配置が逆配置になつていて
も、両者の中間となる局部発振周波数の使用によ
る周波数変換から得られた差信号の出力で低域テ
レビ信号群のチヤンネル配置を逆に入れ代え、こ
の逆入れ代えによつて低域テレビ信号群の映像及
び音声の周波数配置を高域テレビ信号群に一致さ
せることができ、信号方式の異なる高域と低域の
テレビ信号を単一の周波数変換器で中間周波数信
号に変換できると共に、周波数変換器以降の受信
回路部を高域と低域について共通化でき、従来、
低域と高域に分けて周波数変換を行なつていた場
合に比べ回路構成の大幅な簡略化を実現し、テレ
ビ受信機そのもののコストを引き下げることがで
きるという効果が得られる。(Effects of the invention) As explained above, according to the invention, the low-frequency television signal group and the high-frequency television signal group of one or more channels are arranged in frequency with a predetermined empty channel width, and the low-frequency television signal group the video carrier wave and the audio carrier wave of the group are reversely arranged with respect to the group of high frequency television signals;
In a frequency converter that converts a low-frequency television signal group and a high-frequency television signal group into a predetermined intermediate frequency signal, a predetermined oscillation frequency higher than the upper limit frequency of the low-frequency television signal group and lower than the lower limit frequency of the high-frequency television signal group. , a mixer that mixes the output of the local oscillator with the low-frequency television signal group or the high-frequency television signal group, and an output circuit that outputs the difference or sum signal of the mixer output. ,
Even if the frequency arrangement of the video and carrier waves of the low-frequency television signal group is reversed to that of the high-frequency television signal group, the difference signal obtained by frequency conversion using a local oscillation frequency that is intermediate between the two can be output. By reversing the channel arrangement of the low-frequency TV signal group, it is possible to match the video and audio frequency arrangement of the low-frequency TV signal group with the high-frequency TV signal group, and by this reverse swapping, it is possible to match the frequency arrangement of the video and audio of the low-frequency TV signal group to the high-frequency TV signal group. It is possible to convert high-frequency and low-frequency television signals into intermediate frequency signals with a single frequency converter, and the receiving circuit after the frequency converter can be shared for high and low frequencies.
Compared to the case where frequency conversion is performed separately for low and high frequencies, the circuit configuration can be significantly simplified, and the cost of the television receiver itself can be reduced.
第1図は本考案の一実施例を示した回路ブロツ
ク図、第2図は本考案による周波数変換を示した
周波数配置図、第3図はMDSにおけるチヤンネ
ル周波数の配置図である。
1……混合回路、2……第1の入力端子、3…
…第2の入力端子、4,5,11,13,16…
…バンドパスフイルタ、6,17,18……アン
プ、7……混合器、8……局部発振器、9……水
晶発振器、10,12……逓倍器、19……出力
端子。
FIG. 1 is a circuit block diagram showing an embodiment of the present invention, FIG. 2 is a frequency allocation diagram showing frequency conversion according to the invention, and FIG. 3 is a channel frequency allocation diagram in MDS. 1...Mixing circuit, 2...First input terminal, 3...
...Second input terminal, 4, 5, 11, 13, 16...
... Band pass filter, 6, 17, 18 ... Amplifier, 7 ... Mixer, 8 ... Local oscillator, 9 ... Crystal oscillator, 10, 12 ... Multiplier, 19 ... Output terminal.
Claims (1)
高域テレビ信号群を所定の空きチヤンネル幅をも
つて周波数配置し、前記低域テレビ信号群の映像
搬送波及び音声搬送波が高域テレビ信号群に対し
逆配置され、該低域テレビ信号群および高域テレ
ビ信号群を所定の中間周波数信号に変換する周波
数変換器に於いて、 前記低域テレビ信号群の上限周波数より高く且
つ前記高域テレビ信号群の下限周波数より低い所
定の発振周波数を有する局部発振器と、前記低域
テレビ信号群及び高域テレビ信号群と前記局部発
振器の出力とを混合する混合器と、該混合器出力
のうちの差又は和信号を出力する出力回路とを備
えたことを特徴とする周波数変換器。[Claims for Utility Model Registration] One or more channels of low-frequency television signal group and high-frequency television signal group are arranged in frequency with a predetermined empty channel width, and the video carrier wave and audio carrier wave of the low-frequency television signal group are a frequency converter arranged inversely to the high frequency television signal group and converting the low frequency television signal group and the high frequency television signal group into a predetermined intermediate frequency signal, the frequency being higher than the upper limit frequency of the low frequency television signal group; a local oscillator having a predetermined oscillation frequency lower than the lower limit frequency of the high-frequency television signal group; a mixer for mixing the low-frequency television signal group and the high-frequency television signal group with the output of the local oscillator; 1. A frequency converter, comprising: an output circuit that outputs a difference or sum signal of the outputs of the frequency converter.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10985484U JPS6126381U (en) | 1984-07-20 | 1984-07-20 | frequency converter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10985484U JPS6126381U (en) | 1984-07-20 | 1984-07-20 | frequency converter |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6126381U JPS6126381U (en) | 1986-02-17 |
JPH0416537Y2 true JPH0416537Y2 (en) | 1992-04-14 |
Family
ID=30668987
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10985484U Granted JPS6126381U (en) | 1984-07-20 | 1984-07-20 | frequency converter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6126381U (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH089172Y2 (en) * | 1989-08-23 | 1996-03-13 | 株式会社豊田自動織機製作所 | Cleaning device in spinning machine |
-
1984
- 1984-07-20 JP JP10985484U patent/JPS6126381U/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS6126381U (en) | 1986-02-17 |
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