JPH02140630A - Vertical scanning signal forming circuit - Google Patents
Vertical scanning signal forming circuitInfo
- Publication number
- JPH02140630A JPH02140630A JP63293985A JP29398588A JPH02140630A JP H02140630 A JPH02140630 A JP H02140630A JP 63293985 A JP63293985 A JP 63293985A JP 29398588 A JP29398588 A JP 29398588A JP H02140630 A JPH02140630 A JP H02140630A
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- Prior art keywords
- signal
- vertical scanning
- horizontal
- scanning
- vco
- Prior art date
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- Granted
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- 238000001514 detection method Methods 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 230000010354 integration Effects 0.000 claims abstract description 3
- 230000001360 synchronised effect Effects 0.000 claims description 8
- 230000007423 decrease Effects 0.000 abstract description 4
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 11
- 230000005855 radiation Effects 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- WPYVAWXEWQSOGY-UHFFFAOYSA-N indium antimonide Chemical compound [Sb]#[In] WPYVAWXEWQSOGY-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000001931 thermography Methods 0.000 description 1
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Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は赤外線放射温度計の走査手段に用い好適な垂直
走査信号形成回路に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vertical scanning signal forming circuit suitable for use in a scanning means of an infrared radiation thermometer.
従来の赤外線温度計を用いたサーモグラフィーはサーマ
ルカメラ内に赤外線温度計となるＩｎＳｂ或はＨｇＣｄ
Ｔｅ等からなる光電変換用のセンサをクライオスタット
内に配設し、−１９６℃の液体窒素で冷却して使用して
いる。又、サーマルカメラ内には機械的走査機構が配さ
れ、この走査機構は被検体上を水平及び垂直方向に走査
し、この被検体からの赤外線放射エネルギをセンサに集
束させる様になされている。第３図は従来から用いられ
ている水平共振走査鏡の概念図であり、水平走査鏡（１
）の左右端には可動軸（２Ｌ） （２Ｒ）が固定され、
可動軸（２Ｒ）は一端が固定部（３）に固定した板バネ
（４）に固定されている。又、可動軸（２Ｌ）の他端に
はマグネット（５）が固定され、このマグネット（５）
と対向して水平走査鏡を水平方向に駆動する駆動用のコ
イル（６）が巻回されている。尚、（７）はベアリング
軸受を示す。In thermography using a conventional infrared thermometer, InSb or HgCd, which serves as an infrared thermometer, is placed inside the thermal camera.
A photoelectric conversion sensor made of Te or the like is placed in a cryostat and is used while being cooled with liquid nitrogen at -196°C. A mechanical scanning mechanism is also disposed within the thermal camera, and the scanning mechanism is configured to scan the subject in horizontal and vertical directions and to focus infrared radiation energy from the subject onto the sensor. Figure 3 is a conceptual diagram of a conventionally used horizontal resonant scanning mirror.
) are fixed to the left and right ends of the movable shafts (2L) (2R),
The movable shaft (2R) has one end fixed to a leaf spring (4) fixed to the fixed part (3). Also, a magnet (5) is fixed to the other end of the movable shaft (2L), and this magnet (5)
A driving coil (6) for driving the horizontal scanning mirror in the horizontal direction is wound opposite to the horizontal scanning mirror. Note that (7) indicates a bearing.
この水平共振走査鏡で被検体上を水平方向に走査するた
めにコイル（６）に電流を流すと、時計方向に水平走査
鏡（１）が回転する。このときバネ（４）が撚られて、
反時計方向の反撥力が発生する。この時点でコイル（６
）に流す電流の向きを逆転させれば水平走査鏡（１〕は
反時計方向に力が掛かる。この様にバネの反撥力とタイ
ミングをとりながらコイル（６）に流す電流の向きを変
えてやれば走査鏡（１）は共振し、水平走査電流を小さ
くすることが出来る。この様な水平共振走査鏡と垂直走
査鏡との関係を第４図に模式的に示す。垂直走査鏡（８
）もガルバノメータと同じ様な構造の駆動部（８ｂ）を
有し図の如く実線位置から破線位置迄の所定角度回動す
る様になされている。第４図で水平走査鏡〔１）に紙面
の手前から入射した光は水平走査鏡（１）を矢印Ｄ−Ｄ
’方向に回動させることで９０°±１０°垂直走査鏡（
８）上で走査される（紙面の奥から手前に）。更に垂直
走査鏡（８）の時計又は反時計方向の回動によって第４
図Ａ−Ａ’で示す上下（垂直）方向の走査が行なわれる
。第５図は被検体上を水平走査する場合の走査線の模式
図で（９）は往路水平走査線、（１０）は復路水平走査
線を示し、水平走査と共に垂直走査（１３）がなされ、
出発点（１１）から最終点（１２）に達した水平走査線
は垂直帰線期間（１４）内に出発点（１１）に戻される
。When a current is applied to the coil (6) in order to scan the subject in the horizontal direction with this horizontal resonant scanning mirror, the horizontal scanning mirror (1) rotates clockwise. At this time, the spring (4) is twisted,
A counterclockwise repulsive force is generated. At this point, the coil (6
) If you reverse the direction of the current flowing through the coil (6), a force will be applied to the horizontal scanning mirror (1) in a counterclockwise direction.In this way, change the direction of the current flowing through the coil (6) while adjusting the timing with the repulsive force of the spring. If this is done, the scanning mirror (1) will resonate and the horizontal scanning current can be reduced.The relationship between such a horizontal resonant scanning mirror and the vertical scanning mirror is schematically shown in Figure 4.
) also has a drive part (8b) having a structure similar to that of the galvanometer, and is configured to rotate by a predetermined angle from the solid line position to the broken line position as shown in the figure. In Fig. 4, the light incident on the horizontal scanning mirror [1] from the front of the page moves along the horizontal scanning mirror (1) with the arrow D-D.
90°±10° vertical scanning mirror (
8) Scanned at the top (from the back of the page to the front). Further, by rotating the vertical scanning mirror (8) clockwise or counterclockwise, the fourth
Scanning is performed in the vertical (vertical) direction shown in FIG. AA'. FIG. 5 is a schematic diagram of scanning lines when horizontally scanning a subject. (9) shows the outward horizontal scanning line, (10) shows the returning horizontal scanning line, and vertical scanning (13) is performed along with the horizontal scanning.
The horizontal scanning line that has reached the final point (12) from the starting point (11) is returned to the starting point (11) within the vertical retrace period (14).
畝上の水平走査鏡（１）を駆動するためにコイル（６）
に供給する駆動波形は第６図Ｂの如きサイン波形（１６
）であり、この波形の直線部分を用いて第６図Ａに示す
水平同期信号（以下Ｈ！＋７１Ｎ：と記す）（１５）を
得て、この１（ｓＢ。（１５）を計数することで第６図
りに示す垂直走査信号（以下ｖｓｃＡｘと記す） （１
８）を得ている。第７図は従来の垂直同期信号（以下Ｖ
ｉ７１１Ｃと記す） （１７）をえるための垂直走査信
号形成回路を示すものである。第７図でＨＳ、Ｍｌ：（
１５）は入力端子（１９）を通してカウンタ（２０）の
ＣＬＫ端子に入力され、カウンタ（２０）の所定ビット
（例えば８ビツト）データがデジタル−アナログ変換回
路（２１） （以下ＤＡＣと記す）に供給される。ＤＡ
Ｃ（２１）の出力は第６図りに示すＶＳＣＡＭ（１８）
と成されて出力端子（２２）から第４図に示す垂直走査
鏡（８）を駆動する駆動部（８ｂ）の駆動コイルに供給
される。Coil (6) to drive the horizontal scanning mirror (1) on the ridge
The driving waveform to be supplied to is a sine waveform (16
), and by using the straight line part of this waveform to obtain the horizontal synchronizing signal (hereinafter referred to as H!+71N) (15) shown in Figure 6A, and counting this 1 (sB. (15)), Vertical scanning signal (hereinafter referred to as vscAx) shown in the sixth diagram (1
8). Figure 7 shows the conventional vertical synchronization signal (V
(17) (referred to as i711C) shows a vertical scanning signal forming circuit for obtaining (17). In Figure 7, HS, Ml: (
15) is input to the CLK terminal of the counter (20) through the input terminal (19), and predetermined bit (for example, 8 bits) data of the counter (20) is supplied to the digital-to-analog conversion circuit (21) (hereinafter referred to as DAC). be done. D.A.
The output of C (21) is the VSCAM (18) shown in Figure 6.
It is supplied from the output terminal (22) to the drive coil of the drive unit (8b) that drives the vertical scanning mirror (8) shown in FIG.
更にこのＶＳＣＡ）Ｉ（１８）はコンパレータ（２３）
に供給され、基準電圧源（２５）の基準電圧と比較され
、その比較電圧がワンショットマルチバイブレーク（２
４）に供給され、第６図Ｃに示すＶｓｙｘｃ（１７）が
得られる。このＶｓｏ。（１７）をカウンタ（２０）の
クリア端子ＣＬＲに供給すると共に出力端子（２６）に
供給している。Furthermore, this VSCA) I (18) is a comparator (23)
is supplied to the reference voltage source (25), and the comparison voltage is supplied to the one-shot multi-by-break (25).
4) to obtain Vsyxc (17) shown in FIG. 6C. This Vso. (17) is supplied to the clear terminal CLR of the counter (20) and also to the output terminal (26).
従来の畝上の同期回路の走査機構においては被検体から
１個のセンサに入射する放射赤外線を水平及び垂直走査
しているため、１水平走査に対し垂直方向の走査は１ス
テツプずつ進んで第６図りの破線で示す様に階段状とな
り擬似的に鋸歯状波状のＶＳＣＡＮ（１８）が構成され
ているのでＶＳｙＮＣ（１７）は始めのスタート点だけ
でＨ１７Ｍｅ（１５）と同期をとっていることとなる。In the conventional scanning mechanism of the synchronized circuit on the ridge, the radiation infrared rays incident on one sensor from the subject are scanned horizontally and vertically, so the vertical scan advances one step at a time for one horizontal scan. As shown by the broken line in Figure 6, VSCAN (18) has a step-like, pseudo-sawtooth waveform, so VSyNC (17) is synchronized with H17Me (15) only at the initial starting point. becomes.
更に、最近の赤外線放射温度計に於いてはセンサが多素
子化されている。第８図でセンサ（２７ａ）〜（２７ｈ
） を８個縦に並べてこれら８個のセンサを同時に水
平方向に走査する場合について考える。Furthermore, in recent infrared radiation thermometers, the sensor has multiple elements. In Figure 8, sensors (27a) to (27h)
) are arranged vertically and these eight sensors are simultaneously scanned in the horizontal direction.
第８図で（２８）は画面の画素で、一般には３００Ｘ４
００、５２５Ｘ６００等の画素数のものが用いられてい
る。センサ（２７ａ） 〜（２７ｈ） はこの画素
（２８）のピッチＴの２倍の２Ｔのピッチで縦方向に配
列されて水平方向Ｈに往方向に走査させれば往路走査線
（９ａ）〜（９ｈ）が同時に走査される。センサ（２７
ａ） 〜（２７ｈ）が画面の右端に持ち来されると水
平方向Ｈと逆の水平方向Ｈ′に復方向走査させれば復路
走査線（１０ａ） 〜（１０ｈ） が同時に走査され
る。実際に表示される画素データは破線（２９）で示す
位置となり、水平方向Ｈ，Ｈ’に走査線の一往復で一画
素当り２ラインとなる。この様に構成させると往復走査
を利用しているので走査効率を２倍にすることが出来る
反面、Ｈｓｙ＊ｃ（１５）を基準に第７図の様にＶｓｃ
Ａｘ（１７）やＶＳｙＩＣ（１８）を取り出す場合には
、例えば、水平走査線が２５６本あるとすると２５６÷
８＝３２本となって１垂直走査期間の走査線数は３２本
と極めて少なくなってカウンタ（２０）からのＨ３□。In Figure 8, (28) is the screen pixel, which is generally 300x4.
The number of pixels such as 00, 525×600, etc. is used. The sensors (27a) to (27h) are arranged in the vertical direction at a pitch of 2T, which is twice the pitch T of this pixel (28), and if they are scanned in the horizontal direction H in the forward direction, the outgoing scanning lines (9a) to ( 9h) are scanned simultaneously. Sensor (27
a) When lines (27h) to (27h) are brought to the right end of the screen, if scanning is performed in the backward direction in the horizontal direction H' opposite to the horizontal direction H, the backward scanning lines (10a) to (10h) are simultaneously scanned. The pixel data actually displayed is at the position indicated by the broken line (29), and one scan line in the horizontal direction H, H' results in two lines per pixel. With this configuration, since reciprocating scanning is used, the scanning efficiency can be doubled, but on the other hand, as shown in FIG.
When extracting Ax (17) and VSyIC (18), for example, if there are 256 horizontal scanning lines, 256 ÷
8=32, and the number of scanning lines in one vertical scanning period is extremely small, 32, and the counter (20) indicates H3□.
（１５）のカウント値は３２となって分解能は大幅に低
下する問題があった。There was a problem that the count value of (15) was 32 and the resolution was significantly reduced.
更に、水平及び垂直走査鏡を速く振って高速走査しよう
とするとスキャンの遅延が大きくなる問題もあった。Furthermore, there is a problem in that when the horizontal and vertical scanning mirrors are quickly swung to perform high-speed scanning, the scanning delay becomes large.
本発明は畝上の問題点に鑑みなされたもので、その目的
とするところは分解能の低下を抑えることの出来る赤外
線放射温度計に用いる垂直走査信号形成回路を得る様に
したものである。The present invention was made in view of the problem of ridges, and its purpose is to provide a vertical scanning signal forming circuit for use in an infrared radiation thermometer that can suppress a decrease in resolution.
本発明の赤外線放射温度計はその１例が第１図及び第２
図に示されている様に水平同期信号（１５）を計数して
、水平同期信号（１５）に同期した垂直走査信号を形成
する垂直走査信号形成回路に於いて、電圧制御型発振器
（３０）からの基準クロック信号（３０ａ） を分周
した基準信号（３１ａ） と、水平同期信号（１５）
を位相検波する位相検波手段（３２）と、位相検波手段
（３２）出力を電圧制御型発振器（３０）に積分手段（
３３）を介して帰還させた位相ロックループ手段を具備
し、電圧制御型発振器（３０）の基準クロック信号（３
０ａ） をカウンタ（２０）及びデジタル−アナログ
変換手段（２１）に供給して水平同期信号（１５）に同
期した垂直走査信号（１８）を形成したものである。Examples of the infrared radiation thermometer of the present invention are shown in FIGS. 1 and 2.
As shown in the figure, in a vertical scanning signal forming circuit that counts horizontal synchronizing signals (15) and forms vertical scanning signals synchronized with the horizontal synchronizing signals (15), a voltage controlled oscillator (30) A reference signal (31a) obtained by frequency-dividing the reference clock signal (30a) from the horizontal synchronization signal (15)
a phase detection means (32) that detects the phase of the phase detection means (32), and an integration means (
The reference clock signal (33) of the voltage controlled oscillator (30) is
0a) is supplied to a counter (20) and a digital-to-analog conversion means (21) to form a vertical scanning signal (18) synchronized with a horizontal synchronizing signal (15).
本発明の垂直走査信号形成回路によれば位相ロックルー
プを形成するＶ ＣＯ（３０）の基準クロック信号を例
えば、１／２５６ に分周した基準信号と水平同期信号
が位相検波され、積分されてＶ ＣＯ（３０）に帰還さ
れ、このＶＣ○（３０）の基準クロック信号をカウンタ
（２０）でカウントしているのでセンサの多素子化に共
なう水平同期信号のカウント値の減少を補償し、水平同
期信号に正確に同期した垂直走査信号が得られる。According to the vertical scanning signal forming circuit of the present invention, a reference signal obtained by dividing the reference clock signal of the VCO (30) forming a phase-locked loop by, for example, 1/256, and a horizontal synchronizing signal are phase-detected and integrated. Since the reference clock signal of this VC○ (30) is fed back to the V CO (30) and counted by the counter (20), it compensates for the decrease in the count value of the horizontal synchronizing signal due to the increase in the number of elements in the sensor. , a vertical scanning signal accurately synchronized with the horizontal synchronizing signal can be obtained.
以下、本発明の赤外線放射温度計の多素子化した複数セ
ンサを用いる走査機構の垂直走査信号形成回路の一実施
例を第１図及び第２図について詳記する。Hereinafter, an embodiment of a vertical scanning signal forming circuit of a scanning mechanism using a plurality of multi-element sensors of an infrared radiation thermometer of the present invention will be described in detail with reference to FIGS. 1 and 2.
第１図及び第２図で第６図及び第７図との対応部分とは
同一符号を付して重１ｍ明を省略する。In FIGS. 1 and 2, corresponding parts to those in FIGS. 6 and 7 are designated by the same reference numerals, and 1m in height is omitted.
第１図に於いて、入力端子（１９）には第２図へに示す
様なＨｓ□。（１５）が入力される、入力端子（１９）
は位相検波回路（３２）に接続されている。この位相検
波回路（３２）にはｖＣ○（３０）で発振した基準クロ
ック信号（第２図Ｂ参照） （３０ａ）をカウンタ（３
１）に供給し、このカウンタ（３１）で分周された、例
えば１／２５６に分周された第２図Ｃの如き基準パルス
信号（３１ａ） が供給され、上述のＨｓ、ｃ（＋５）
と位相比較がなされる。位相検波された検波出力は積分
回路（３３）で平均化されてＶ Ｃ０（３０）に帰還さ
れ、全体として位相ロックドループ回路（以下ＰＬＬと
記す＞ （３５）を形成している。本例ではＶ ＣＯ（
３０）から基準クロック信号（３０ａ＞ （基準クロッ
ク信号の拡大波形を第２図Ｅに示す）がカウンタ（２０
）とＤＡＣ（２１）に供給される。Ｖ ＣＯ（３０）か
らの基準クロック信号（３０ａ） はカウンタ（２０
）でデータがカウントされて各パルスに対応したＲＯＭ
アドレスを発生し、データ変換テーブルが格納されたＲ
ＯＭ（リード・オンリ・メモリ”） （３４）のアドレ
スに供給される。ＲＯＭ （３４）内ではデータ変換と
共にタンジェントエラーを吸収する様な変換が行なわれ
スキャンの遅延を吸収する。第２図ＦはＲＯＭ（３４）
のアドレス波形を、第２図Ｇの斜線部はＤＡＣ（２１）
の有効データを示している。Ｄ Ａ Ｃ（２１）からは
アナログ化された第２図りに示すＶＳＣＡＮ（１８）が
出力端子（２２）に得られ、これが垂直走査機構を駆動
する垂直駆動コイルに供給される。In FIG. 1, the input terminal (19) has Hs□ as shown in FIG. (15) is input to the input terminal (19)
is connected to the phase detection circuit (32). This phase detection circuit (32) receives the reference clock signal (see Figure 2B) (30a) oscillated by vC○ (30) and converts it into a counter (3
1), and the reference pulse signal (31a) as shown in FIG.
A phase comparison is made. The phase-detected output is averaged by an integrating circuit (33) and fed back to VCO (30), forming a phase-locked loop circuit (hereinafter referred to as PLL) (35) as a whole.In this example, V CO(
The reference clock signal (30a> (an enlarged waveform of the reference clock signal is shown in FIG. 2E) from the counter (20)
) and DAC (21). The reference clock signal (30a) from the VCO (30) is applied to the counter (20
) and the data is counted in the ROM corresponding to each pulse.
R where addresses are generated and data conversion tables are stored.
It is supplied to the address of the OM (Read Only Memory) (34). In the ROM (34), along with data conversion, conversion to absorb tangent errors is performed to absorb scanning delays. Fig. 2F is ROM (34)
The address waveform of
shows valid data. From the DAC (21), an analog VSCAN (18) shown in the second figure is obtained at an output terminal (22), which is supplied to a vertical drive coil that drives a vertical scanning mechanism.
本例の畝上の構成によれば赤外線放射温度計のセンサを
多素子化して垂直、水平走査する走査機構に於いて、水
平同期信号の周波数が減少して垂直走査信号の鋸歯状波
が階段状となり、解像度を劣化させることのない垂直走
査信号を得ることが出来る。According to the ridge configuration of this example, in a scanning mechanism that uses a multi-element infrared radiation thermometer sensor to perform vertical and horizontal scanning, the frequency of the horizontal synchronization signal decreases and the sawtooth wave of the vertical scanning signal becomes stepped. Thus, it is possible to obtain a vertical scanning signal without deteriorating the resolution.
尚、本発明は上述の実施例に限定されることなく、本発
明の要旨を逸脱しない範囲で種々の変更を行うことが出
来る。Note that the present invention is not limited to the above-described embodiments, and various changes can be made without departing from the gist of the present invention.
本発明によれば正確に水平同期信号に同期した垂直走査
信号が得られ、センサの多素子化を行うことの出来る赤
外線放射温度計用の垂直走査信号形成回路が得られる。According to the present invention, it is possible to obtain a vertical scanning signal forming circuit for an infrared radiation thermometer, which can obtain a vertical scanning signal accurately synchronized with a horizontal synchronizing signal, and can make the sensor multi-element.
第１図は本発明の垂直走査信号形成回路の系統図、第２
図は第１図を説明するための波形図、第３図は水平共振
走査鏡の概念図、第４図は水平及び垂直走査鏡の関係を
示す構成図、第５図は従来の走査方法を示す走査線模式
図、第６図は水平及び垂直走査用の波形図、第７図は従
来の垂直走査信号形成回路の系統図、第８図は往復走査
方法を示す走査線模式図である。
（２１）はＤＡＣｌ（３０）はＶ ＣＯ、（２０）、
（３１） はカウンタ、（３２）は位相検波回路、（
３５）はＰＬＬである。
代 理 人 伊 藤 頁間
松 隈 秀 盗人４Ｉ：明分垂直走
萱信号刑広回ｇ＆功為疵図第１図
第２図
第３図
ａ、米の走−萱方応笈示す走査線棟式同第５図
第８図
従−来の争直乏査信湯形八回院系地図
第７図FIG. 1 is a system diagram of the vertical scanning signal forming circuit of the present invention, and FIG.
The figure is a waveform diagram to explain Fig. 1, Fig. 3 is a conceptual diagram of a horizontal resonant scanning mirror, Fig. 4 is a configuration diagram showing the relationship between horizontal and vertical scanning mirrors, and Fig. 5 is a diagram showing the conventional scanning method. 6 is a waveform diagram for horizontal and vertical scanning, FIG. 7 is a system diagram of a conventional vertical scanning signal forming circuit, and FIG. 8 is a schematic diagram of scanning lines showing a reciprocating scanning method. (21) is DACl (30) is V CO, (20),
(31) is a counter, (32) is a phase detection circuit, (
35) is a PLL. Agent Paige Ito
Hide Matsukuma Thief 4I: Akibun Vertical Scanning Signal Punishment and Widespread G & Merits and Defects Figure 1 Figure 2 Figure 3 a, Scanning line ridge type showing the rice running - Kayakata Oshiro Figure 5 Figure 8 Figure 7 - Traditional map of the 8th school system
Claims (1)
走査信号を形成する垂直走査信号形成回路に於いて、 電圧制御型発振器からの基準クロック信号を分周した基
準信号と、水平同期信号を位相検波する位相検波手段と
、該位相検波手段出力を上記電圧制御型発振器に積分手
段を介して帰還させた位相ロックループ手段を具備し、
上記電圧制御型発振器の基準クロック信号をカウンタ及
びデジタル−アナログ変換手段に供給して水平同期信号
に同期した垂直走査信号を形成してなることを特徴とす
る垂直走査信号形成回路。[Claims] In a vertical scanning signal forming circuit that counts horizontal synchronizing signals and forms a vertical scanning signal synchronized with the horizontal synchronizing signals, a reference signal obtained by frequency-dividing a reference clock signal from a voltage controlled oscillator. and a phase detection means for phase detecting a horizontal synchronization signal, and a phase lock loop means for feeding back the output of the phase detection means to the voltage controlled oscillator via an integration means,
A vertical scanning signal forming circuit characterized in that the reference clock signal of the voltage controlled oscillator is supplied to a counter and digital-to-analog conversion means to form a vertical scanning signal synchronized with a horizontal synchronizing signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63293985A JP2849596B2 (en) | 1988-11-21 | 1988-11-21 | Vertical scanning signal forming circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63293985A JP2849596B2 (en) | 1988-11-21 | 1988-11-21 | Vertical scanning signal forming circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02140630A true JPH02140630A (en) | 1990-05-30 |
| JP2849596B2 JP2849596B2 (en) | 1999-01-20 |
Family
ID=17801758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63293985A Expired - Fee Related JP2849596B2 (en) | 1988-11-21 | 1988-11-21 | Vertical scanning signal forming circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2849596B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100338460B1 (en) * | 1999-01-22 | 2002-05-30 | 조동일 | Vehicle Detector Using Loop Sensor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61281694A (en) * | 1985-05-16 | 1986-12-12 | Sanyo Electric Co Ltd | Pll circuit |
| JPS6213670A (en) * | 1985-07-10 | 1987-01-22 | 渡辺 三義 | Bag box body having stress responsive lock mounted thereto |
-
1988
- 1988-11-21 JP JP63293985A patent/JP2849596B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61281694A (en) * | 1985-05-16 | 1986-12-12 | Sanyo Electric Co Ltd | Pll circuit |
| JPS6213670A (en) * | 1985-07-10 | 1987-01-22 | 渡辺 三義 | Bag box body having stress responsive lock mounted thereto |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100338460B1 (en) * | 1999-01-22 | 2002-05-30 | 조동일 | Vehicle Detector Using Loop Sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2849596B2 (en) | 1999-01-20 |
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