JPS628587Y2 - - Google Patents
Info
- Publication number
- JPS628587Y2 JPS628587Y2 JP8496278U JP8496278U JPS628587Y2 JP S628587 Y2 JPS628587 Y2 JP S628587Y2 JP 8496278 U JP8496278 U JP 8496278U JP 8496278 U JP8496278 U JP 8496278U JP S628587 Y2 JPS628587 Y2 JP S628587Y2
- Authority
- JP
- Japan
- Prior art keywords
- coil
- capacitor
- bobbin
- circuit board
- printed circuit
- 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
- 239000003990 capacitor Substances 0.000 claims description 18
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 239000011889 copper foil Substances 0.000 claims description 5
- 230000010355 oscillation Effects 0.000 description 3
- 229910000679 solder Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
Description
【考案の詳細な説明】
本考案は送、受信機の局部発振回路等に用いる
同調装置に関し、簡単な構成で湿度変化等に起因
する周波数ずれを防止するようにしたものであ
る。[Detailed Description of the Invention] The present invention relates to a tuning device used in local oscillation circuits of transmitters and receivers, and is designed to prevent frequency shifts caused by changes in humidity and the like with a simple configuration.
一般にFM受信機等の局部発振回路は、第１図
に示すようにコイルＬ、コンデンサC1〜C3、可
変コンデンサVCからなる同調部分と、トランジ
スタTr、抵抗R1〜R3、コンデンサC4〜C6からな
る発振部分とで構成されている。 Generally, a local oscillation circuit such as an FM receiver has a tuning part consisting of a coil L, capacitors C1 to C3 , and a variable capacitor VC, as shown in Fig. 1, a transistor Tr, resistors R1 to R3 , and a capacitor C4. It consists of an oscillating part consisting of ~ C6 .
従来、上記同調部分を構成する場合には、第２
図に示すようにしていた。すなわち、プリント基
板１上にコイルＬを巻いたボビン２を配置し、上
記コイルＬの信号側ｓとアース側ｅを共にプリン
ト基板１に半田付けし、さらにコンデンサC2等
も信号側ｓとアース側ｅを共にプリント基板１に
半田付けし、上記コイルＬの信号側ｓと可変コン
デンサVCの信号側ｓとを銅箔３で接続するよう
にしていた。 Conventionally, when configuring the above-mentioned tuning part, the second
It was as shown in the figure. That is, a bobbin 2 on which a coil L is wound is placed on a printed circuit board 1, and both the signal side s and the ground side e of the coil L are soldered to the printed circuit board 1, and the capacitor C 2 etc. are also connected between the signal side s and the ground side. Both sides e were soldered to the printed circuit board 1, and the signal side s of the coil L and the signal side s of the variable capacitor VC were connected with a copper foil 3.
ところが、このように構成すると、一般に耐湿
特性の良くないプリント基板を用いた場合、第３
図に示すように各接続部分の間に形成される浮遊
容量C0が湿度変化によつて大きく変化し、その
ため同調周波数がずれてしまうという問題があつ
た。 However, with this configuration, if a printed circuit board with generally poor moisture resistance is used, the third
As shown in the figure, there was a problem in that the stray capacitance C 0 formed between each connection part changed greatly due to changes in humidity, which caused the tuning frequency to shift.
また、このような構成では、ボビンの下方に突
出するリードが、コイルのアース側及び信号側端
部の２本だけであるため、半田デイツプ時にボビ
ンが安定に自立せず、そのため傾いて取付けられ
て、近くの部品とシヨートする等の問題もある。 In addition, in this configuration, the only two leads that protrude below the bobbin are the ground side and signal side ends of the coil, so the bobbin cannot stand stably on its own during soldering, and is therefore installed at an angle. There are also problems such as shooting with nearby parts.
本考案はこのような問題を解決するようにした
同調装置を提供するものである。 The present invention provides a tuning device that solves these problems.
第４図は本考案の一実施例を示すものであり、
同調装置を構成するコンデンサC1，C2等をコイ
ルボビン２上に載置し、そのアース側ｅをボビン
２の孔を介して下方へ延長するとともに、その信
号側ｓをコイルＬの信号側ｓに半田４によつて接
続し、上記コイルＬの信号側ｓとアース側ｅとを
ボビン２の孔を介して下方へ延長するようにした
ものである。 FIG. 4 shows an embodiment of the present invention,
Capacitors C 1 , C 2 , etc. constituting the tuning device are placed on the coil bobbin 2, and their ground side e extends downward through the hole in the bobbin 2, and their signal side s is connected to the signal side s of the coil L. The signal side s and the ground side e of the coil L are extended downward through a hole in the bobbin 2.
そして第４図に示したような複合部品を第５図
に示すようにプリント基板１上に配置し、コイル
ＬとコンデンサC1，C3のアース側ｅを銅箔に半
田付けし、コイルＬの信号側ｓはプリント基板１
の銅箔を介することなく、半田５によつて直接可
変コンデンサVCの信号側ｓに接続するようにし
ている。 Then, the composite parts shown in Fig. 4 are arranged on the printed circuit board 1 as shown in Fig. 5, and the ground sides e of the coil L and capacitors C 1 and C 3 are soldered to copper foil, and the coil L The signal side s of is printed circuit board 1
It is directly connected to the signal side s of the variable capacitor VC by the solder 5 without going through the copper foil.
このようにすれば、浮遊容量の変化を受け易い
各部品の信号側が、耐湿特性のよいコイルボビン
上で接続されるため、湿度変化による同調周波数
のずれをきわめて小さくすることができる。 In this way, the signal side of each component that is susceptible to changes in stray capacitance is connected on the coil bobbin, which has good moisture resistance, so that deviations in tuning frequency due to changes in humidity can be made extremely small.
しかもこの実施例のように、コイルＬの信号側
ｓと可変コンデンサVCの信号側ｓとを、プリン
ト基板１の銅箔を介することなく直接接続するよ
うにすれば、この部分の浮遊容量も小さくするこ
とができ、全体として非常に優れた同調装置にす
るとができる。 Moreover, as in this embodiment, if the signal side s of the coil L and the signal side s of the variable capacitor VC are directly connected without going through the copper foil of the printed circuit board 1, the stray capacitance of this part can also be reduced. This makes it possible to make a very good tuning device as a whole.
以上のように本考案は同調装置を構成するコン
デンサをコイルボビン上に載置し、それらのアー
ス側端部をプリント基板に半田付けし、それらの
信号側端部を直接可変コンデンサに接続するよう
にしたものであるから、耐湿特性の悪いプリント
基板を用いた場合にも、湿度変化に伴う周波数ず
れを小さくすることができる。しかもコイルボビ
ン上に複数の部品が一体的に組合わされるため、
耐湿対策や作業工数の点でも有利になる。また、
コンデンサのアース側端部がボビンを貫通してプ
リント基板の透孔に差しこまれるため、コイルの
両端部とコンデンサのアース側端部とが共働して
ボビンを支持することになる。このため、半田デ
イツプ時にボビンを安定に自立させることがで
き、ボビンが傾いて取付けられることによる不測
の事故を確実に防止することができる。 As described above, in this invention, the capacitors that make up the tuning device are placed on the coil bobbin, their ground side ends are soldered to the printed circuit board, and their signal side ends are directly connected to the variable capacitor. Therefore, even when a printed circuit board with poor moisture resistance characteristics is used, frequency shifts due to changes in humidity can be reduced. Moreover, since multiple parts are integrated on the coil bobbin,
It is also advantageous in terms of moisture resistance and work hours. Also,
Since the ground side end of the capacitor passes through the bobbin and is inserted into the through hole of the printed circuit board, both ends of the coil and the ground side end of the capacitor work together to support the bobbin. Therefore, the bobbin can be stably made to stand on its own during solder dipping, and unexpected accidents caused by the bobbin being installed at an angle can be reliably prevented.
第１図は一般的な局部発振回路を示す回路図、
第２図、第３図は従来の同調装置を示す側面図、
第４図は本考案の一実施例の要部を示す斜視図、
第５図は上記実施例の側面図である。
１……プリント基板、２……コイルボビン、
４，５……半田、Ｌ……コイル、C1，C3……コ
ンデンサ。
Figure 1 is a circuit diagram showing a general local oscillation circuit.
Figures 2 and 3 are side views showing a conventional tuning device;
FIG. 4 is a perspective view showing the main parts of an embodiment of the present invention;
FIG. 5 is a side view of the above embodiment. 1... Printed circuit board, 2... Coil bobbin,
4, 5...Solder, L...Coil, C1 , C3 ...Capacitor.
Claims (1)
サのアース側端部を挿入し、上記コイルの一端と
コンデンサの各アース側端部をそれぞれプリント
基板の銅箔に接続するとともに、上記コイルとコ
ンデンサの信号側端部を直接可変コンデンサの信
号側端部に接続するようにした同調装置。 Insert the ground side end of the capacitor into the hole provided in the bobbin that makes up the coil, connect one end of the coil and each ground side end of the capacitor to the copper foil of the printed circuit board, and connect the signals of the coil and capacitor. A tuning device whose side end is directly connected to the signal side end of the variable capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8496278U JPS628587Y2 (en) | 1978-06-20 | 1978-06-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8496278U JPS628587Y2 (en) | 1978-06-20 | 1978-06-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS553532U JPS553532U (en) | 1980-01-10 |
| JPS628587Y2 true JPS628587Y2 (en) | 1987-02-27 |
Family
ID=29008146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8496278U Expired JPS628587Y2 (en) | 1978-06-20 | 1978-06-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS628587Y2 (en) |
-
1978
- 1978-06-20 JP JP8496278U patent/JPS628587Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS553532U (en) | 1980-01-10 |
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