JP2591821B2 - Automatic light intensity control circuit - Google Patents
Automatic light intensity control circuitInfo
- Publication number
- JP2591821B2 JP2591821B2 JP1122799A JP12279989A JP2591821B2 JP 2591821 B2 JP2591821 B2 JP 2591821B2 JP 1122799 A JP1122799 A JP 1122799A JP 12279989 A JP12279989 A JP 12279989A JP 2591821 B2 JP2591821 B2 JP 2591821B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- reference voltage
- control circuit
- image signal
- 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 - Lifetime
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- Laser Beam Printer (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
- Facsimile Scanning Arrangements (AREA)
- Fax Reproducing Arrangements (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は中間調画像を記録するフアクシミリ装置の記
録，光学系に使用する光量自動制御回路に関するもので
ある。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light quantity automatic control circuit used for recording and an optical system of a facsimile apparatus for recording a halftone image.
従来の光量自動制御回路の一例を第３図に示し説明す
る。An example of a conventional automatic light amount control circuit is shown in FIG. 3 and described.
図において、21は基準電圧発生回路、22は画像信号／
基準電圧切替回路、23はゲイン制御回路、24は駆動回
路、25はレーザー管、26は光学変調器、27は光センサ
ー、28は増幅回路、29は設定電圧発生回路、30は増幅回
路28からの光量電圧VHと設定電圧発生回路29よりの設定
電圧VSを比較する比較回路である。In the figure, 21 is a reference voltage generating circuit, 22 is an image signal /
Reference voltage switching circuit, 23 is a gain control circuit, 24 is a drive circuit, 25 is a laser tube, 26 is an optical modulator, 27 is an optical sensor, 28 is an amplifying circuit, 29 is a set voltage generating circuit, 30 is an amplifying circuit 28 a comparator circuit for comparing the set voltage V S than the light amount-voltage V H set voltage generation circuit 29.
そして、ａはレーザー光、ｂは切替信号を示し、VPは
画像信号、VRは基準電圧、VDは駆動入力電圧を示す。Then, a is a laser beam, b represents a switching signal, V P is the image signal, V R is the reference voltage, V D denotes a drive input voltage.
このように構成された光量自動制御回路において、光
量の制御を行う場合には、まず、画像信号／基準電圧切
替回路22を切替信号ｂにより基準電圧に切替え、基準電
圧発生回路21より一定電圧を出力する。つぎに、駆動入
力電圧VDは駆動回路24を経て光学変調器26によりレーザ
ー管25よりのレーザー光ａを制御する。そして、光セン
サー27の出力を増幅回路28により増幅した光量電圧VHが
設定電圧発生回路29からの設定電圧VSに等しくなるよう
にゲイン制御回路23において増幅度が制御される。In the light amount automatic control circuit configured as described above, when controlling the light amount, first, the image signal / reference voltage switching circuit 22 is switched to the reference voltage by the switching signal b, and the reference voltage generation circuit 21 supplies a constant voltage. Output. Next, the drive input voltage V D to control the laser beam a of from laser tube 25 by an optical modulator 26 through the driving circuit 24. Then, the amplification degree in the gain control circuit 23, as light amount-voltage V H was amplified becomes equal to the set voltage V S from the set voltage generation circuit 29 by the amplifier circuit 28 the output of the optical sensor 27 is controlled.
その後、切替信号ｂにより画像信号／基準電圧切替回
路22を画像信号に切替え、ゲイン制御回路23を固定して
記録を行う。Thereafter, the image signal / reference voltage switching circuit 22 is switched to the image signal by the switching signal b, and the recording is performed with the gain control circuit 23 fixed.
第４図は第３図の動作説明に供する図で、（ａ）は第
３図における駆動回路24の特性を示し、（ｂ）は光学変
調器26の特性を示す。なお、この第４図（ｂ）において
，，は特性曲線の変化を表わしたものである。4A and 4B are diagrams for explaining the operation of FIG. 3, wherein FIG. 4A shows the characteristics of the drive circuit 24 in FIG. 3, and FIG. 4B shows the characteristics of the optical modulator 26. In FIG. 4 (b), represents a change in the characteristic curve.
上述した従来の光量自動制御回路は、例えば、レーザ
ー管25の光量が低下した場合には、上記の制御方法によ
りゲイン制御回路23においてゲインを上げ、駆動回路24
の出力電圧を増して光学変調器26の効率を上げることに
よりVH＝VSとなるように制御される。そして、このよう
に自動的に基準電圧VRに対し出力光量が一定になるよう
に制御されることにより、基準電圧VRに等しい画信号に
おいては光量は一定となる。The above-mentioned conventional automatic light amount control circuit, for example, when the light amount of the laser tube 25 decreases, the gain is increased in the gain control circuit 23 by the above-described control method, and the drive circuit 24
By increasing the output voltage of the optical modulator 26 to increase the efficiency of the optical modulator 26, it is controlled so that V H = V S. By thus automatically reference voltage V R to the output light quantity is controlled to be constant, the amount of light is constant in equal image signal to the reference voltage V R.
しかし、画信号が中間調を記録するため、特性曲線が
変化した場合、駆動回路24および光学変調器26の振幅特
性が非線形であるので、第４図（ａ）示すようにゲイン
制御回路23におけるゲイン係数がＫ倍変化した場合使用
する電圧域の変化によつて傾きが変わる。そして、第４
図（ｂ）に示すように画像信号VPと光量電圧VHの関係を
表わすと、基準電圧VRのポイントを中心に傾きが変動す
ることになる。However, if the characteristic curve changes because the image signal records a halftone, the amplitude characteristics of the drive circuit 24 and the optical modulator 26 are non-linear, and as shown in FIG. When the gain coefficient changes by a factor of K, the slope changes due to a change in the voltage range used. And the fourth
When representing the relationship between the image signals V P and the light quantity voltage V H as shown in FIG. (B), slope will vary around a point of reference voltage V R.
そのため、従来の光量自動制御回路では、画像信号VP
の振幅幅における安定性が得られないという課題があつ
た。Therefore, in the conventional automatic light amount control circuit, the image signal V P
However, there is a problem that stability in the amplitude width cannot be obtained.
本発明の光量自動制御回路は、画像信号又は画像信号
に相当する基準電圧を選択して出力する画像信号／基準
電圧切替回路と、光量電圧が最も低くなる画像信号の最
低値に相当する第１の基準電圧及び第１の基準電圧より
高い第２の基準電圧を画像信号／基準電圧切替回路に与
える基準電圧発生回路と、光量電圧に相当する電圧とし
て、第１の設定電圧及び第１の設定電圧より高い第２の
設定電圧を発生する設定電圧発生回路と、画像信号／基
準電圧切替回路の出力を入力とし、第２の基準電圧が入
力されたとき、光量電圧と第２の設定電圧が等しくなる
ように増幅度を制御するゲイン制御回路と、このゲイン
制御回路の出力に応じて光学変調器を駆動する駆動回路
と、ゲイン制御回路に第１の基準電圧が入力されたと
き、光量電圧と第１の設定電圧が等しくなるように駆動
回路のバイアス値を制御するバイアス制御回路とを備
え、画像信号に対する光量電圧の特性曲線について、最
初に第１の基準電圧と第１の設定電圧の交点をバイアス
制御回路によって設定し、次に第２の基準電圧と第２の
設定電圧の交点をゲイン制御回路によって設定すること
により、２つの交点を通る特性曲線を設定して、系の非
線形成分をも含め記録する中間調の範囲において光量特
性を一致させるようにしたものである。An automatic light amount control circuit according to the present invention includes an image signal / reference voltage switching circuit for selecting and outputting an image signal or a reference voltage corresponding to the image signal, and a first signal corresponding to the lowest value of the image signal at which the light amount voltage is lowest. A reference voltage generating circuit for providing a reference voltage and a second reference voltage higher than the first reference voltage to the image signal / reference voltage switching circuit; and a first setting voltage and a first setting as voltages corresponding to the light amount voltage. A setting voltage generating circuit for generating a second setting voltage higher than the voltage and an output of the image signal / reference voltage switching circuit are input. When the second reference voltage is input, the light amount voltage and the second setting voltage are changed. A gain control circuit for controlling the degree of amplification so as to be equal, a drive circuit for driving the optical modulator according to the output of the gain control circuit, and a light amount voltage when a first reference voltage is input to the gain control circuit. And the first And a bias control circuit for controlling a bias value of the drive circuit so that the constant voltage is equal to each other. In the characteristic curve of the light amount voltage with respect to the image signal, first, an intersection of the first reference voltage and the first set voltage is bias-controlled. The characteristic curve passing through the two intersections is set by setting the intersection of the second reference voltage and the second set voltage by the gain control circuit, and recording including the nonlinear component of the system. In this case, the light amount characteristics are matched in the range of the half tone.
本発明においては、バイアスの制御と、ゲインの制御
により画像信号に対する光量電圧の特性曲線における設
定電圧の交わる２点を設定し、系の非線形成分をも含め
記録する中間調の範囲において光量特性を一致させる。According to the present invention, two points where the set voltage intersects in the characteristic curve of the light quantity voltage with respect to the image signal are set by controlling the bias and the gain, and the light quantity characteristic is adjusted in the range of the halftone to be recorded including the nonlinear component of the system. Match.
以下、図面に基づき本発明の実施例を詳細に説明す
る。Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
第１図は本発明による光量自動制御回路の一実施例を
示すブロック図である。FIG. 1 is a block diagram showing an embodiment of an automatic light quantity control circuit according to the present invention.
この第１図において第３図と同一符号のものは相当部
分を示し、１は２つの基準電圧VR1,VR2を発生する基準
電圧発生回路、２は画像信号／基準電圧切替回路、３は
この画像信号／基準電圧切替回路２の出力を入力とし増
幅度を制御するゲイン制御回路、４は駆動回路、５はレ
ーザー管、６は光学変調器、７は光センサー、８は増幅
回路、９は２つの設定電圧VS1,VS2を発生する設定電圧
発生回路、10は増幅回路８からの光量電圧VHと設定電圧
発生回路９よりの設定電圧VS1,VS2を比較する比較回
路、11はこの比較回路10の出力と切替信号ｂを入力とし
２つの基準電圧VR1,VR2,2つの設定電圧VS1,VS2および画
像信号VPに対する光量電圧VHの特性曲線における設定電
圧の交わる２点を設定するためのバイアス制御回路であ
る。In FIG. 1, the same reference numerals as those in FIG. 3 denote corresponding parts, 1 is a reference voltage generating circuit for generating two reference voltages V R1 and V R2 , 2 is an image signal / reference voltage switching circuit, and 3 is A gain control circuit for controlling the amplification by using the output of the image signal / reference voltage switching circuit 2 as an input, 4 is a driving circuit, 5 is a laser tube, 6 is an optical modulator, 7 is an optical sensor, 8 is an amplification circuit, 9 Is a set voltage generation circuit that generates two set voltages V S1 and V S2 , 10 is a comparison circuit that compares the light intensity voltage V H from the amplifier circuit 8 and the set voltages V S1 and V S2 from the set voltage generation circuit 9, 11 reference voltage V R1 the output and the input switching signal b of the two comparison circuits 10, V R2, two set voltage V S1, V S2 and the image signal setting of the characteristic curve of the light intensity voltage V H voltage for V P Is a bias control circuit for setting two points where.
第２図は第１図の動作説明に供する図で、（ａ）は本
発明の特性を示したものであり、（ｂ）はバイアス設定
状態、（ｃ）はゲイン設定状態を示したものである。2A and 2B are diagrams for explaining the operation of FIG. 1, wherein FIG. 2A shows the characteristics of the present invention, FIG. 2B shows the bias setting state, and FIG. 2C shows the gain setting state. is there.
つぎに第１図に示す実施例の動作を第２図を参照して
説明する。Next, the operation of the embodiment shown in FIG. 1 will be described with reference to FIG.
まず、基準電圧発生回路１は画像信号VPに対する光量
電圧VHの特性曲線における設定電圧の交わる２点を決定
するための基準電圧VR1＝０と基準電圧VR2を発生し、切
替信号ｂによつて画像信号／基準電圧切替回路２で切替
え、駆動回路４を経て光学変調器６によりレーザー管５
からのレーザー光ａを制御し、光センサー７の出力を増
幅回路８にて増幅した光量電圧VHを出力する。First, the reference voltage generating circuit 1 generates a reference voltage V R1 = 0 and the reference voltage V R2 for determining the two points of intersection of the set voltage in the characteristic curve of the light intensity voltage V H for the image signal V P, the switching signal b Is switched by the image signal / reference voltage switching circuit 2, and the laser tube 5 is driven by the optical modulator 6 through the driving circuit 4.
Controlling a laser beam a from, and outputs a light amount-voltage V H obtained by amplifying the output of the light sensor 7 in the amplifier circuit 8.
そして、この光量電圧VHは設定電圧発生回路９よりの
設定電圧VS1および設定電圧VS2と比較回路10により比較
され、切替信号ｂが設定電圧VS1を選択している場合
は、VH＝VS1となるようにバイアス制御回路11において
バイアス値が制御され、駆動回路４で加算される。ま
た、切替信号ｂが設定電圧VS2を選択している場合にはV
H＝VS2となるようにゲイン制御回路３において増幅度が
制御される。Then, the light quantity voltage V H are compared by the comparison circuit 10 and the set voltage V S1, the set voltage V S2 than the set voltage generation circuit 9, when the switching signal b has selected a set voltage V S1, V H The bias value is controlled by the bias control circuit 11 so that = V S1, and the bias value is added by the drive circuit 4. When the switching signal b selects the set voltage V S2 , V
The gain is controlled in the gain control circuit 3 so that H = VS2 .
以上の動作により、まず、切替信号ｂによつて画像信
号／基準電圧切替回路２は基準電圧VR1＝φを選択し、
比較回路10は設定電圧VS1を選択してバイアス制御回路1
1を動作状態とする。これによつて、バイアス制御回路1
1はVH＝VS1となるように駆動回路４へのバイアス値を制
御する。その状態を第２図（ｂ）に示す。そして、VH＝
VS1となつたところで、バイアス制御回路11は動作を停
止する。By the above operation, first, the image signal / reference voltage switching circuit 2 selects the reference voltage V R1 = φ by the switching signal b,
The comparison circuit 10 selects the set voltage VS1 and sets the bias control circuit 1
Set 1 to the operating state. As a result, the bias control circuit 1
1 controls the bias value to the drive circuit 4 so that V H = V S1 . The state is shown in FIG. 2 (b). And V H =
When the voltage reaches V S1 , the bias control circuit 11 stops operating.
つぎに、切替信号ｂにより画像信号／基準電圧切替回
路２は基準電圧VR2を選択し、比較回路10は設定電圧VS2
を選択し、ゲイン制御回路３を動作状態にする。これに
よつてゲイン制御回路３はVH＝VS2となるように増幅度
を制御する。その状態を第２図（ｅ）に示す。Next, the image signal / reference voltage switching circuit 2 selects the reference voltage V R2 according to the switching signal b, and the comparison circuit 10 sets the set voltage V S2.
Is selected, and the gain control circuit 3 is set to the operating state. This Yotsute gain control circuit 3 controls the amplification degree so that V H = V S2. The state is shown in FIG.
そして、VH＝VS2となつたところでゲイン制御回路３
は動作を停止する。つぎに、切替信号ｂにより画像信号
／基準電圧切替回路２で画像信号VPを選択し、記録を行
うこととなる。Then, when V H = V S2 , the gain control circuit 3
Stops operation. Next, the image signal / VP is selected by the image signal / reference voltage switching circuit 2 based on the switching signal b, and recording is performed.
このように、バイアスの制御とゲインの制御により画
像信号に対する光量電圧の特性曲線における設定電圧の
交わる２点を設定することによつて、第２図（ａ）に示
すように従来の技術における第４図（ｂ）に示すような
ゲインのバラツキをなくし、画像信号の振幅幅全域にお
ける変動の発生しない光量制御ができる。As described above, by setting two points where the set voltage intersects in the characteristic curve of the light quantity voltage with respect to the image signal by controlling the bias and controlling the gain, as shown in FIG. 4 A variation in gain as shown in FIG. 4B can be eliminated, and light quantity control can be performed without fluctuation in the entire amplitude width of the image signal.
以上説明したように本発明は、バイアスの制御とゲイ
ンの制御により画像信号に対する光量電圧の特性曲線に
おける設定電圧の交わる２点を設定することによつて、
ゲインのバラツキをなくし、画像信号の振幅幅全域にお
いて変動の発生しない光量制御ができる効果がある。As described above, the present invention sets the two points where the set voltage intersects on the characteristic curve of the light intensity voltage with respect to the image signal by controlling the bias and the gain.
There is an effect that the variation in gain can be eliminated and the light quantity can be controlled without fluctuation in the entire amplitude width of the image signal.
第１図は本発明による光量自動制御回路の一実施例を示
すブロツク図、第２図は第１図の動作説明に供する特性
図、第３図は従来の光量自動制御回路の一例を示すブロ
ツク図、第４図は第３図の動作説明に供する特性図であ
る。 １……基準電圧発生回路、２……画像信号／基準電圧切
替回路、３……ゲイン制御回路、４……駆動回路、９…
…設定電圧発生回路、10……比較回路、11……バイアス
制御回路。FIG. 1 is a block diagram showing an embodiment of an automatic light amount control circuit according to the present invention, FIG. 2 is a characteristic diagram for explaining the operation of FIG. 1, and FIG. FIG. 4 and FIG. 4 are characteristic diagrams for explaining the operation of FIG. 1 ... reference voltage generation circuit, 2 ... image signal / reference voltage switching circuit, 3 ... gain control circuit, 4 ... drive circuit, 9 ...
... Set voltage generation circuit, 10 ... Comparison circuit, 11 ... Bias control circuit.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 荒川 徳夫 東京都港区芝５丁目33番１号 日本電気 株式会社内 (56)参考文献 特開 昭64−97974（ＪＰ，Ａ) 特開 昭62−237474（ＪＰ，Ａ) ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Tokuo Arakawa 5-33-1, Shiba, Minato-ku, Tokyo Within NEC Corporation (56) References JP-A-64-97974 (JP, A) JP-A-62 −237474 (JP, A)
Claims (1)
学変調器と光学変調器からの出射光を検出する光センサ
ーとを備え、光センサーから得られた光量電圧に基づい
て光量を制御する、中間調画像を記録するファクシミリ
装置の記録・光学系に使用される光量自動制御回路にお
いて、 画像信号又は画像信号に相当する基準電圧を選択して出
力する画像信号／基準電圧切替回路と、 前記光量電圧が最も低くなる画像信号の最低値に相当す
る第１の基準電圧及び第１の基準電圧より高い第２の基
準電圧を画像信号／基準電圧切替回路に与える基準電圧
発生回路と、 前記光量電圧に相当する電圧として、第１の設定電圧及
び第１の設定電圧より高い第２の設定電圧を発生する設
定電圧発生回路と、 画像信号／基準電圧切替回路の出力を入力とし、第２の
基準電圧が入力されたとき、光量電圧と第２の設定電圧
が等しくなるように増幅度を制御するゲイン制御回路
と、 このゲイン制御回路の出力に応じて前記光学変調器を駆
動する駆動回路と、 ゲイン制御回路に第１の基準電圧が入力されたとき、光
量電圧と第１の設定電圧が等しくなるように駆動回路の
バイアス値を制御するバイアス制御回路とを備え、 画像信号に対する光量電圧の特性曲線について、最初に
第１の基準電圧と第１の設定電圧の交点をバイアス制御
回路によって設定し、次に第２の基準電圧と第２の設定
電圧の交点をゲイン制御回路によって設定することによ
り、２つの交点を通る前記特性曲線を設定して、系の非
線形成分をも含め記録する中間調の範囲において光量特
性を一致させるようにしたことを特徴とする光量自動制
御回路。An optical modulator that controls laser light from a laser tube; and an optical sensor that detects light emitted from the optical modulator, and controls a light amount based on a light amount voltage obtained from the optical sensor. An image signal / reference voltage switching circuit for selecting and outputting an image signal or a reference voltage corresponding to the image signal; A first reference voltage corresponding to the lowest value of the image signal having the lowest voltage and a second reference voltage higher than the first reference voltage to the image signal / reference voltage switching circuit; And a set voltage generating circuit for generating a first set voltage and a second set voltage higher than the first set voltage, and an output of an image signal / reference voltage switching circuit as inputs. A gain control circuit for controlling an amplification degree such that a light quantity voltage becomes equal to a second set voltage when a second reference voltage is input; and driving the optical modulator according to an output of the gain control circuit. And a bias control circuit that controls a bias value of the drive circuit so that the light amount voltage becomes equal to the first set voltage when the first reference voltage is input to the gain control circuit. First, the intersection of the first reference voltage and the first set voltage is set by the bias control circuit, and then the intersection of the second reference voltage and the second set voltage is set to the gain control circuit. By setting the characteristic curve, the characteristic curve passing through the two intersections is set, and the light amount characteristics are matched in the range of the halftone to be recorded including the nonlinear component of the system. The amount automatic control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1122799A JP2591821B2 (en) | 1989-05-18 | 1989-05-18 | Automatic light intensity control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1122799A JP2591821B2 (en) | 1989-05-18 | 1989-05-18 | Automatic light intensity control circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02303272A JPH02303272A (en) | 1990-12-17 |
| JP2591821B2 true JP2591821B2 (en) | 1997-03-19 |
Family
ID=14844924
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1122799A Expired - Lifetime JP2591821B2 (en) | 1989-05-18 | 1989-05-18 | Automatic light intensity control circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2591821B2 (en) |
-
1989
- 1989-05-18 JP JP1122799A patent/JP2591821B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02303272A (en) | 1990-12-17 |
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