JPH0516512Y2 - - Google Patents
Info
- Publication number
- JPH0516512Y2 JPH0516512Y2 JP8740385U JP8740385U JPH0516512Y2 JP H0516512 Y2 JPH0516512 Y2 JP H0516512Y2 JP 8740385 U JP8740385 U JP 8740385U JP 8740385 U JP8740385 U JP 8740385U JP H0516512 Y2 JPH0516512 Y2 JP H0516512Y2
- Authority
- JP
- Japan
- Prior art keywords
- scanning mirror
- oscillator
- frequency
- amplitude
- self
- 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 - Lifetime
Links
- 230000010355 oscillation Effects 0.000 claims description 22
- 238000001931 thermography Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010408 sweeping Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000005516 engineering process 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、赤外線で温度を見るサーモグラフイ
装置に係り、特に、走査ミラーを自励発振に引き
込むサーモグラフイ装置の走査ミラー自励発振引
き込み回路に関するものである。[Detailed description of the invention] [Industrial application field] The present invention relates to a thermography device that measures temperature using infrared rays, and in particular, to a scanning mirror self-oscillation of a thermography device that pulls a scanning mirror into self-oscillation. This relates to a pull-in circuit.
第３図は従来のサーモグラフイ装置の走査ミラ
ー自励発振引き込み回路を示す図であり、１１は
固定端、１２はコイルバネ、１３は走査ミラー、
１４はモータ、１５は位置センサー、１６は増幅
器、１７は同期信号発生器、１８はパルス幅変調
器、１９は振幅検出回路、２０は誤差増幅器、２
１と２４は基準信号発生器、２２は発振器、２３
は比較器、２５はドライバー、TR1とTR2はパ
ワートランジスタ、VRは調整抵抗、SWは切り
換えスイツチを示す。
FIG. 3 is a diagram showing a scanning mirror self-oscillation pull-in circuit of a conventional thermography apparatus, in which 11 is a fixed end, 12 is a coil spring, 13 is a scanning mirror,
14 is a motor, 15 is a position sensor, 16 is an amplifier, 17 is a synchronization signal generator, 18 is a pulse width modulator, 19 is an amplitude detection circuit, 20 is an error amplifier, 2
1 and 24 are reference signal generators, 22 is an oscillator, 23
is a comparator, 25 is a driver, TR1 and TR2 are power transistors, VR is an adjustment resistor, and SW is a changeover switch.
第３図に示すようにサーモグラフイ装置は、コ
イルバネ１２を介して走査ミラー１３を固定端１
１に取り付けこれをモータ１４により駆動する、
固有振動を持つ系で構成されている。このモータ
１４は、パワートランジスタTR1とTR2のオ
ン／オフによつて制御され、パワートランジスタ
TR1とTR2は、切り換えスイツチSWを通して発
振器２２又はパルス幅変調器１８から供給される
ドライブ信号を基にドライバー２５によつてオ
ン／オフされる。 As shown in FIG.
1 and driven by the motor 14,
It consists of a system with natural vibrations. This motor 14 is controlled by turning on/off power transistors TR1 and TR2.
TR1 and TR2 are turned on and off by a driver 25 based on a drive signal supplied from the oscillator 22 or the pulse width modulator 18 through the changeover switch SW.
スタート時には、切り換えスイツチSWが発振
器２２側にあり、発振器２２の周波数を調整抵抗
VRにより調整（一般には初めに固有振動系の周
波数に合わせて調整し、その後固定する）し、そ
の周波数によりドライバー２５を制御して、その
系の固有振動に合わせて走査ミラー１３を振動さ
せる。そして、位置センサー１５からの位置信号
（振幅に比例して大きくなる信号）から振幅検出
回路１９で振幅を検出し、走査ミラー１３が固有
振動の振動周波数に同期して振動してある程度の
振幅になると、比較器２３にてスイツチSWをパ
ルス幅変調器１８側に切り換えてドライバー２５
をパルス幅変調器１８の出力により制御し、安定
した走査ミラー１３の振動を持続させている。 At the start, the changeover switch SW is on the oscillator 22 side, and the frequency of the oscillator 22 is adjusted by the resistor.
It is adjusted by VR (generally first adjusted to match the frequency of the natural vibration system and then fixed), and the driver 25 is controlled by the frequency to vibrate the scanning mirror 13 in accordance with the natural vibration of the system. Then, the amplitude detection circuit 19 detects the amplitude from the position signal (a signal that increases in proportion to the amplitude) from the position sensor 15, and the scanning mirror 13 vibrates in synchronization with the vibration frequency of the natural vibration to a certain degree of amplitude. Then, the comparator 23 switches the switch SW to the pulse width modulator 18 side and the driver 25
is controlled by the output of the pulse width modulator 18 to maintain stable vibration of the scanning mirror 13.
パルス幅変調器１８は、位置センサー１５から
の位置信号を基に生成した同期信号（同期信号発
生器１７）、及び走査ミラー１３の振幅を基準値
と比較して得られた振幅誤差信号（誤差増幅器２
０）により固有振動の周波数で所定の振幅が得ら
れるパルス幅変調信号を生成する。 The pulse width modulator 18 uses a synchronization signal (synchronization signal generator 17) generated based on the position signal from the position sensor 15 and an amplitude error signal (error signal) obtained by comparing the amplitude of the scanning mirror 13 with a reference value. amplifier 2
0) to generate a pulse width modulation signal that obtains a predetermined amplitude at the frequency of the natural vibration.
しかしながら、上述のような従来の走査ミラー
自励発振引き込み回路では、固有振動系の周波数
が経年的に変化し、或いは周囲の温湿度により変
化すると、調整抵抗を使つて調整した発振器の周
波数で系の固有振動と同期せず起動がかからなく
なつてしまうという問題が生じる。
However, in the conventional scanning mirror self-oscillation pull-in circuit as described above, when the frequency of the natural oscillation system changes over time or due to ambient temperature and humidity, the system cannot be adjusted at the frequency of the oscillator adjusted using the adjustment resistor. A problem arises in that it is not synchronized with the natural vibration of the engine and cannot be started.
本考案は、上記の問題を解決するものであつ
て、系の固有振動数が変化しても円滑な起動が可
能なサーモグラフイ装置の走査ミラー自励発振引
き込み回路を提供することを目的とするものであ
る。 The present invention solves the above-mentioned problems, and aims to provide a scanning mirror self-oscillation pull-in circuit for a thermography device that can be started smoothly even when the natural frequency of the system changes. It is something to do.
そのために本考案は、振動する固有振動系の走
査ミラーの同期信号と振幅を検出して所定の周波
数と振幅の駆動信号を走査ミラーのドライバに与
える自励発振ループ、所定範囲の周波数と振幅の
駆動信号を走査ミラーのドライバに与える発振
器、及び振動する走査ミラーの振幅を検出し該振
幅が所定の振幅になつたことを検出して発振器か
ら自励発振ループに走査ミラーのドライバを切り
換え接続する切り換え手段を備え、起動時には発
振器の発振出力を使つて走査ミラーを振らせ、所
定の振幅が得られたことを条件にしてスイツチ手
段を発振器から自励発振ループに切り換えて走査
ミラーを振らせるサーモグラフイ装置の走査ミラ
ー自励発振引き込み回路であつて、発振周波数が
固有振動系の周波数の前後にわたつて変化する発
振器を用いたことを特徴とするものである。
To this end, the present invention uses a self-excited oscillation loop that detects the synchronization signal and amplitude of the scanning mirror in the vibrating natural vibration system and provides a driving signal of a predetermined frequency and amplitude to the scanning mirror driver. An oscillator that applies a drive signal to the scanning mirror driver, detects the amplitude of the vibrating scanning mirror, detects that the amplitude reaches a predetermined amplitude, and switches and connects the scanning mirror driver from the oscillator to a self-excited oscillation loop. A thermostat comprising a switching means, which uses the oscillation output of an oscillator to swing the scanning mirror at startup, and, on the condition that a predetermined amplitude is obtained, switches the switching means from the oscillator to a self-excited oscillation loop to swing the scanning mirror. This is a scanning mirror self-excited oscillation pull-in circuit for a graphic device, and is characterized by using an oscillator whose oscillation frequency varies around the frequency of the natural oscillation system.
本考案のサーモグラフイ装置の走査ミラー自励
発振引き込み回路では、起動時に発振器の周波数
が固有振動系の周波数の前後にわたつて変化する
ので、固有振動系の周波数が変化してもその周波
数により走査ミラーを振らせることができる。従
つて、所定の振幅を得ることができ、自励発振へ
引き込み立ち上げることができる。
In the scanning mirror self-oscillation pull-in circuit of the thermography device of the present invention, the frequency of the oscillator changes before and after the frequency of the natural oscillation system at startup, so even if the frequency of the natural oscillation system changes, it will not change depending on the frequency. The scanning mirror can be made to swing. Therefore, a predetermined amplitude can be obtained and self-sustained oscillation can be started.
以下、実施例を図面を参照しつつ説明する。 Examples will be described below with reference to the drawings.
第１図は本考案に係る走査ミラー自励発振引き
込み回路の１実施例を示す図であり、１は低周波
発振器、２は積分器、３は電圧コントロール発振
器を示す。 FIG. 1 is a diagram showing one embodiment of the scanning mirror self-excited oscillation pull-in circuit according to the present invention, in which 1 represents a low frequency oscillator, 2 represents an integrator, and 3 represents a voltage controlled oscillator.
第１図に示す走査ミラー自励発振引き込み回路
は、低周波発振器１、積分器２、電圧コントロー
ル発振器３により第３図に示す発振器２２を構成
するようにしたものである。この回路構成では、
電源がオンすると、低周波発振器１で第１図ｂに
示す矩形波を発生し、積分器２でこの矩形波を積
分することによつて第１図ｃに示す三角波とし、
この三角波を電圧コントロール発振器３の制御電
圧とする。電圧コントロール発振器３は、制御電
圧に比例した周波数の信号を出力するものであ
り、第１図ｃに示す三角波の平均レベル（点線）
のときに走査ミラーによる固有振動系の周波数0
と同じ周波数の信号を出力するように設定され
る。従つて、走査ミラーの固有振動の周波数0を
中心として
0−Δ〜0＋Δ
の範囲で電圧コントロール発振器３から第１図ｃ
に示すように三角波に対応して周波数が低い周期
でゆつくりとスイープするパルス列の信号が出力
される。そのため、先に述べたようななんらかの
条件の変化により走査ミラーの固有振動数が変化
した場合においても、その範囲がΔの範囲内で
あれば電源オンにより電圧コントロール発振器３
が低い周期でゆつくりとスイープするパルス列の
途中で固有振動数と一致する。これにより、所定
の振幅が得られるようになるから、切り換えスイ
ツチSWがパルス幅変調器側に切り換えられて起
動がかかる。 The scanning mirror self-excited oscillation pull-in circuit shown in FIG. 1 has a low frequency oscillator 1, an integrator 2, and a voltage control oscillator 3 forming an oscillator 22 shown in FIG. In this circuit configuration,
When the power is turned on, the low frequency oscillator 1 generates the rectangular wave shown in FIG. 1b, and the integrator 2 integrates this rectangular wave to create the triangular wave shown in FIG. 1c,
This triangular wave is used as the control voltage of the voltage control oscillator 3. The voltage control oscillator 3 outputs a signal with a frequency proportional to the control voltage, and the average level of the triangular wave (dotted line) shown in FIG.
When the frequency of the natural vibration system due to the scanning mirror is 0
is set to output a signal with the same frequency as . Therefore, from the voltage controlled oscillator 3 in the range of 0 - Δ to 0 + Δ centering on the frequency 0 of the natural vibration of the scanning mirror, as shown in FIG.
As shown in the figure, a slowly sweeping pulse train signal with a low frequency cycle corresponding to the triangular wave is output. Therefore, even if the natural frequency of the scanning mirror changes due to a change in some condition as described above, as long as the range is within the range of Δ, the voltage controlled oscillator 3 can be activated by turning on the power.
coincides with the natural frequency in the middle of a slowly sweeping pulse train with a low period. As a result, a predetermined amplitude can be obtained, so the changeover switch SW is switched to the pulse width modulator side and activation is started.
第２図は本考案に係る走査ミラー自励発振引き
込み回路の他の実施例を示す図であり、４は電圧
コントロール発振器、Ｒは抵抗、Ｃはコンデンサ
を示す。抵抗ＲとコンデンサＣにより時定数の長
い積分回路を構成し、電源オン時に電圧コントロ
ール発振器４の制御電圧を第２図ｂに示すように
ゆつくりと上昇させる。この制御電圧の変化に従
つて電圧コントロール発振器４は、第２図ｃに示
すように周波数がゆつくりと上昇するパルス列の
信号を送出する。従つて、その上昇の途中で走査
ミラーの固有振動の周波数に等しくなると所定の
振幅が得られるようになり切り換えスイツチSW
がパルス幅変調器側に切り換えられて起動がかか
る。 FIG. 2 is a diagram showing another embodiment of the scanning mirror self-excited oscillation pull-in circuit according to the present invention, in which 4 represents a voltage controlled oscillator, R represents a resistor, and C represents a capacitor. A resistor R and a capacitor C constitute an integrating circuit with a long time constant, and when the power is turned on, the control voltage of the voltage controlled oscillator 4 is slowly increased as shown in FIG. 2b. In accordance with this change in control voltage, the voltage controlled oscillator 4 sends out a pulse train signal whose frequency gradually increases as shown in FIG. 2c. Therefore, when it becomes equal to the frequency of the natural vibration of the scanning mirror during its ascent, a predetermined amplitude is obtained and the changeover switch SW is turned on.
is switched to the pulse width modulator side and activation takes place.
以上の説明から明らかなように、本考案によれ
ば、起動時に走査ミラーを固有振動の周波数で振
動させ自励発振引き込みを行う際、起動時の周波
数発生回路を走査ミラーの固有振動の周波数の前
後でゆつくりと変化させ、固有振動数と同期した
ところで起動をかけるので、経年変化や環境の変
化などにより固有振動数が変化しても確実に起動
をかけることができる。
As is clear from the above explanation, according to the present invention, when the scanning mirror is vibrated at the frequency of the natural oscillation at the time of startup to perform self-excited oscillation pull-in, the frequency generating circuit at the time of startup is set to the frequency of the natural oscillation of the scanning mirror. Since it changes slowly back and forth and starts when it is synchronized with the natural frequency, it can be started reliably even if the natural frequency changes due to aging or changes in the environment.
第１図は本考案に係る走査ミラー自励発振引き
込み回路の１実施例を示す図、第２図は本考案に
係る走査ミラー自励発振引き込み回路の他の実施
例を示す図、第３図は従来のサーモグラフイ装置
の走査ミラー自励発振引き込み回路を示す図であ
る。
１……低周波発振器、２……積分器、３と４…
…電圧コントロール発振器、１１……固定端、１
２……コイルバネ、１３……走査ミラー、１４…
…モータ、１５……位置センサー、１６……増幅
器、１７……同期信号発生器、１８……パルス幅
変調器、１９……振幅検出回路、２０……誤差増
幅器、２１と２４……基準信号発生器、２２……
発振器、２３……比較器、２５……ドライバー、
TR1とTR2……パワートランジスタ、SW……切
り換えスイツチ、VR……調整抵抗、Ｒ……抵
抗、Ｃ……コンデンサ。
FIG. 1 is a diagram showing one embodiment of the scanning mirror self-excited oscillation pull-in circuit according to the present invention, FIG. 2 is a diagram showing another embodiment of the scanning mirror self-excited oscillation pull-in circuit according to the present invention, and FIG. 1 is a diagram showing a scanning mirror self-oscillation pull-in circuit of a conventional thermography apparatus. 1...Low frequency oscillator, 2...Integrator, 3 and 4...
...Voltage controlled oscillator, 11...Fixed end, 1
2...Coil spring, 13...Scanning mirror, 14...
... Motor, 15 ... Position sensor, 16 ... Amplifier, 17 ... Synchronous signal generator, 18 ... Pulse width modulator, 19 ... Amplitude detection circuit, 20 ... Error amplifier, 21 and 24 ... Reference signal Generator, 22...
Oscillator, 23... comparator, 25... driver,
TR1 and TR2...power transistor, SW...changeover switch, VR...adjustment resistor, R...resistor, C...capacitor.
Claims (1)
と振幅を検出して所定の周波数と振幅の駆動信
号を走査ミラーのドライバに与える自励発振ル
ープ、所定範囲の周波数と振幅の駆動信号を走
査ミラーのドライバに与える発振器、及び振動
する走査ミラーの振幅を検出し該振幅が所定の
振幅になつたことを検出して発振器から自励発
振ループに走査ミラーのドライバを切り換え接
続する切り換え手段を備え、起動時には発振器
の発振出力を使つて走査ミラーを振らせ、所定
の振幅が得られたことを条件にしてスイツチ手
段を発振器から自励発振ループに切り換えて走
査ミラーを振らせるサーモグラフイ装置の走査
ミラー自励発振引き込み回路であつて、発振周
波数が固有振動系の周波数の前後にわたつて変
化する発振器を用いたことを特徴とするサーモ
グラフイ装置の走査ミラー自励発振引き込み回
路。 (2) 発振器は、電圧コントロール発振器を用い、
起動時に該電圧コントロール発振器に供給する
制御電圧を固有振動系の周波数の発生電圧の前
後にわたつて変化させるように構成したことを
特徴とする実用新案登録請求の範囲第１項記載
のサーモグラフイ装置の走査ミラー自励発振引
き込み回路。[Utility Model Claims] (1) A self-oscillating loop for detecting a synchronization signal and amplitude of a scanning mirror of a vibrating natural vibration system and providing a drive signal of a prescribed frequency and amplitude to the driver of the scanning mirror, an oscillator for providing a drive signal of a prescribed range of frequencies and amplitudes to the driver of the scanning mirror, and switching means for detecting the amplitude of the vibrating scanning mirror and detecting when the amplitude reaches the prescribed amplitude and switching and connecting the driver of the scanning mirror from the oscillator to the self-oscillating loop, the scanning mirror is oscillated using the oscillation output of the oscillator at startup, and when the prescribed amplitude is obtained, the switching means is switched from the oscillator to the self-oscillation loop to oscillate the scanning mirror, characterized in that the self-oscillating loop for a scanning mirror of a thermography device is characterized in that it uses an oscillator whose oscillation frequency varies over a range between the frequency of the natural vibration system. (2) The oscillator uses a voltage-controlled oscillator,
A scanning mirror self-oscillation pull-in circuit for a thermography device as claimed in claim 1, characterized in that the control voltage supplied to the voltage-controlled oscillator at start-up is changed over a range including before and after the generation voltage of the frequency of the natural oscillation system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8740385U JPH0516512Y2 (en) | 1985-06-10 | 1985-06-10 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8740385U JPH0516512Y2 (en) | 1985-06-10 | 1985-06-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61203328U JPS61203328U (en) | 1986-12-20 |
| JPH0516512Y2 true JPH0516512Y2 (en) | 1993-04-30 |
Family
ID=30639587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8740385U Expired - Lifetime JPH0516512Y2 (en) | 1985-06-10 | 1985-06-10 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0516512Y2 (en) |
-
1985
- 1985-06-10 JP JP8740385U patent/JPH0516512Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61203328U (en) | 1986-12-20 |
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