JPS61105983A - Beam current controlling circuit of electron beam picture recording device - Google Patents
Beam current controlling circuit of electron beam picture recording deviceInfo
- Publication number
- JPS61105983A JPS61105983A JP59227497A JP22749784A JPS61105983A JP S61105983 A JPS61105983 A JP S61105983A JP 59227497 A JP59227497 A JP 59227497A JP 22749784 A JP22749784 A JP 22749784A JP S61105983 A JPS61105983 A JP S61105983A
- Authority
- JP
- Japan
- Prior art keywords
- electron beam
- recording device
- beam current
- circuit
- supplied
- 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.)
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Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は電子ビーム録画装置のビーム電流制御回路に関
する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a beam current control circuit for an electron beam recording device.
従来、写真用フィルムに電子ビームをスタイラスとして
テレビジョン画偉を記録する電子ビーム録画装置（以下
ＥＢＲと略称する）が知られている。そして、従来のＥ
ＢＲにおいては、動作初期におけるＥＢＲの温度変化に
起因するビームを流の変動を補償するために、ビーム電
流の制御が行なわれ【いる。まず、第３図及び第４図を
参照しながら、従来のＢＢＲのビーム電流制御回路につ
いて説明する。2. Description of the Related Art Conventionally, an electron beam recording device (hereinafter abbreviated as EBR) is known that records television images on photographic film using an electron beam as a stylus. And the conventional E
In a BR, beam current is controlled in order to compensate for variations in beam flow caused by temperature changes in the EBR at the initial stage of operation. First, a conventional BBR beam current control circuit will be described with reference to FIGS. 3 and 4.
第３図に従来のＥＢＨの電流制御回路の一例を示す。第
３図において、（１）はＥＢＲであって、その内部に装
填されたフィルムＰＫ向かつて、フィラメント（２）か
ら記録用電子ビームＢｒが射出され、電子ビームＢｒの
ビーム電・流量がグリッド（３）の電圧によって制御さ
れる。（４）はファラデーケージと呼ばれるビーム電流
検出電極であって、ブランキング期間のみ記録用電子ビ
ームＢｒがこの検出電極（４）に向う如く偏向されて、
この電極（４）にビーム電流Ｂｂカ流入する。（５）は
フィラメント（２）のための電源、（６）は排気口であ
る。なお、電子ビームに対する集束、偏向、加速手段等
は周知で′あるの二図示及び説明を省略する。FIG. 3 shows an example of a conventional EBH current control circuit. In FIG. 3, (1) is an EBR, in which a recording electron beam Br is emitted from a filament (2) toward a film PK loaded inside the EBR, and the beam current and flow rate of the electron beam Br is adjusted to a grid ( 3) is controlled by the voltage. (4) is a beam current detection electrode called a Faraday cage, and the recording electron beam Br is deflected toward this detection electrode (4) only during the blanking period.
Beam current Bb flows into this electrode (4). (5) is a power source for filament (2), and (6) is an exhaust port. Note that the means for focusing, deflecting, accelerating the electron beam, etc. are well known and will not be shown or described here.
Ｅ Ｂ Ｒ（１）のグリッド（３）Ｋは、入力端子部及
び増幅器ａυを介して、記録されるべき映像信号が供給
される。α２はバイアス制御回路、α３は最小ｌ値検出
回路であって、バイアス制御回路α２の出力がＥ Ｂ
Ｒ（１）のグリッド（３）Ｋ供給されると共に、最小１
１！検出回路（１３１の出力が制御信号としてバイアス
制御回路α３に供給される。また、Ｂ Ｂ Ｒ（１）の
検出電極（４）の出力が増幅器α滲を介して最小値検出
回路α３（・〔供給される。A video signal to be recorded is supplied to grid (3) K of EBR (1) via an input terminal section and an amplifier aυ. α2 is a bias control circuit, α3 is a minimum l value detection circuit, and the output of the bias control circuit α2 is E B
Grid (3) of R(1) is supplied with K and a minimum of 1
1! The output of the detection circuit (131) is supplied as a control signal to the bias control circuit α3. Also, the output of the detection electrode (4) of BBR (1) is supplied to the minimum value detection circuit α3 (. Supplied.
こうして、Ｂ Ｂ Ｒ（１）のブランキング期間の電子
ビームＢｂ 、増幅器Ｉ、最小値検出回路ａ３及びバイ
アス制御回路（ＬｚＫよってサーボループＬ人が形成さ
れ、電子ビームＢｂの最小値が一定になるように制御さ
れる。このサーボループＬＡの時定数７人を適宜に選べ
ば、非ブ２ンキング期間、即ち記録期間の電子ビームＢ
ｒＫ対してもブランキング期間と同様のバイアス制御が
行なわれ【、電子ビームＢｒの最小値が映像信号の例え
ば黒レベルに対応し【一定になるように制御される。In this way, a servo loop L is formed by the electron beam Bb during the blanking period of BBR(1), the amplifier I, the minimum value detection circuit a3, and the bias control circuit (LzK), and the minimum value of the electron beam Bb becomes constant. If the time constant 7 of this servo loop LA is selected appropriately, the electron beam B during the non-bending period, that is, the recording period.
Bias control similar to the blanking period is performed for rK, and the minimum value of the electron beam Br corresponds to, for example, the black level of the video signal and is controlled to be constant.
従来のＢＢＲの電流制御回路の他の例を第４図に示す。Another example of a conventional BBR current control circuit is shown in FIG.
この第４図において、第３図に対応する部分には同一の
符号を付して重複説明を省略すも第４図において、α９
は利得制御増幅器、Ｑ６１は最大値検出回路であって、
利得制御増幅器０５）は入力端子Ｑｌと増幅器αυとの
間に介挿され、最大値検出回路αｅの出力が利得制御信
号としてこの増幅器ａωに供給される。また、増幅器α
４の出力が最小ｌ検出回路翰に供給される。In FIG. 4, parts corresponding to those in FIG.
is a gain control amplifier, Q61 is a maximum value detection circuit,
A gain control amplifier 05) is inserted between the input terminal Ql and the amplifier αυ, and the output of the maximum value detection circuit αe is supplied to the amplifier aω as a gain control signal. Also, amplifier α
The output of 4 is supplied to the minimum l detection circuit.
こうして、 ＥＢＲ（１）のブランキング期間の電子と
一ムＢｂ、増幅器ａを、最大値検出回路αｅ、利得制御
増幅器（１９及び増幅器αυによってサーボループＬＢ
が形成され、電子ビームＢｂの最大値が一定になるよう
圧制御される。このサーボループＬＢの時定数τＢを適
宜に選べば、ブランキング期間のみならず、記録期間の
電子ビームＢｒに対しても、その最大値が映像信号の例
えば白レベルに対応し【一定になるよ、うな制御が行な
われる。In this way, the electrons during the blanking period of EBR (1), Bb, and amplifier a are connected to the servo loop LB by the maximum value detection circuit αe, the gain control amplifier (19), and the amplifier αυ.
is formed, and the pressure is controlled so that the maximum value of the electron beam Bb is constant. If the time constant τB of this servo loop LB is selected appropriately, its maximum value will correspond to, for example, the white level of the video signal, and will be constant not only for the blanking period but also for the electron beam Br during the recording period. , such control is performed.
なお、上述の２つの電流制御回路は併用することができ
る。Note that the above two current control circuits can be used together.
Ｅ Ｂ Ｒ（１）の動作初期の温度変化、或はフィラメ
ント（２）の交換等に起因して記録ビーム電流Ｂｒが変
動する場合、上述のようなビーム電流制御回路を用いて
、記録ビーム電ｉｌｌ、Ｂｒの最大値、最小値を映像信
号の例えば白レベル、黒レベルに対応して一定忙維持す
ることができる。If the recording beam current Br fluctuates due to temperature changes during the initial operation of the EBR (1) or replacement of the filament (2), the recording beam current can be changed using the beam current control circuit as described above. The maximum and minimum values of ill and Br can be maintained at a constant level in accordance with, for example, the white level and black level of the video signal.
しかしながら、映像信号の中間調の各レベルＥｌ、Ｅ２
・・・Ｋ対応するビーム電（ｉｆ、Ｂｒの各中間値Ｉｆ
Ｉ２・・・Ｋ対しては、上述のビーム電流制御回路は
有効忙作用せず、ビーム電＠Ｂｒの各中間値具なってし
まい、正しく記録することができないという問題があっ
た。However, each halftone level El, E2 of the video signal
... K corresponding beam electric power (if, each intermediate value If of Br
For I2...K, the above-mentioned beam current control circuit does not work effectively, resulting in intermediate values of the beam current @Br, and there is a problem in that correct recording cannot be performed.
か〜る点に鑑み、本発明の目的は、動作初期の温度変化
等に影響されることなく、ｍ像の階調が正しく記録され
るようＫＢＢＨのビーム電流を制御することのできる、
電子ビーム録画装置のビーム電流制御回路を提案するＫ
ある。In view of the above, an object of the present invention is to control the beam current of the KBBH so that the gradation of the m-image is recorded correctly without being affected by temperature changes in the initial stage of operation.
K proposes a beam current control circuit for electron beam recording equipment
be.
本発明は電子ビーム録画装置（１）と、基準レベル信勺
発生器α場と、ガンマ福生回路ａｎと、レベル比較回路
（イ）とを具備し、基準レベル信号発生器ａ９の出力を
ガンマ補正回路αｎを介して電子ビーム録画装置（１）
の入力電極（３）Ｋ供給すると共に、電子ビーム録画装
置（１）の検出電極（４）からの出力と基準レベル信号
発生器ａ９の出力とをレベル比較回路■に供給し、この
レベル比較回路■の出力によってガンマ補正回路αＤの
特性を制御するよう圧した電子ビーム録画装置のビーム
電流制御回路である。The present invention includes an electron beam recording device (1), a reference level signal generator α field, a gamma Fussa circuit an, and a level comparison circuit (a), and gamma corrects the output of the reference level signal generator a9. Electron beam recording device (1) via circuit αn
At the same time, the output from the detection electrode (4) of the electron beam recording device (1) and the output of the reference level signal generator a9 are supplied to the level comparison circuit ■. This is a beam current control circuit of an electron beam recording device that controls the characteristics of the gamma correction circuit αD by the output of (2).
かへる本発明によれば、ガンマ補正回路αＤの入出力特
性が電子ビーム録画装置（１）のビーム電流の特性に応
じて制御される。According to the present invention, the input/output characteristics of the gamma correction circuit αD are controlled according to the characteristics of the beam current of the electron beam recording device (1).
以下、第１図及び第２図を参照しながら、本発明圧よる
電子ビーム録画装量のビームを流制倫回路の一実施例に
ついて説明する。Hereinafter, with reference to FIGS. 1 and 2, an embodiment of a beam flow regulation circuit of an electron beam recording device according to the present invention will be described.
第１ｒｉＡＫ本発明の一実施例の構成を示す。この第１
図において、第３図及び第４図に対応する部分には同一
の符号を付して重複説明を省略する。First riAK shows the configuration of an embodiment of the present invention. This first
In the figure, parts corresponding to FIGS. 3 and 4 are designated by the same reference numerals, and redundant explanation will be omitted.
第１図において、αＤはガンマ補正回路であつ１切換ス
イッチＯｇｊの共通接点（１８Ｃ）と利得制御増幅器ａ
５との間に介挿される。スイッチ０秒の一方の固定接点
（１８ａ）は入力端子αＩＫ接続される。α９は階段波
発生器、艶はレベル比較器であって、階段波発生器α１
の出力（ｎ段の直線的な階段波電圧）は切換スイッチα
ａの他方の固定接点（１８ｂ） Ｋ供給されると共に、
レベル比較器［株］に供給される。In Fig. 1, αD is a gamma correction circuit, which connects the common contact (18C) of the 1 changeover switch Ogj and the gain control amplifier a.
It is inserted between 5 and 5. One fixed contact (18a) of the switch 0 seconds is connected to the input terminal αIK. α9 is a staircase wave generator, gloss is a level comparator, and staircase wave generator α1
The output (n-stage linear staircase wave voltage) is the changeover switch α
The other fixed contact (18b) of a is supplied with K, and
Supplied to a level comparator [stock].
レベル比較器ＣＩ！ＯＫは増幅器Ｉを介してＢ Ｂ Ｒ
（１１の検出電極（４）の出力が供給され、レベル比較
器（イ）の出力はガンマ補正回路（１７）Ｋ供給される
。尚、この実施例では、第３図及び第４図について説明
した従来の電流制御回路をも具備しているが、その説明
は省略する。Level comparator CI! OK is B B R via amplifier I
(The output of the detection electrode (4) of 11 is supplied, and the output of the level comparator (A) is supplied to the gamma correction circuit (17) K. In this embodiment, FIGS. 3 and 4 will be explained. Although it also includes a conventional current control circuit, a description thereof will be omitted.
上述のガンマ補正回路αηの具体的構成例を第２図に示
す。第２図において、ダイオードＤ１．半固定抵抗器Ｒ
１及び半固定電源Ｅ１が直列に接続されて第１の制御分
枝、が構成され、これが同様の構成の第２〜第ｎの制御
分枝と共に並列に接続され二公知の折れ線近似回路が形
成される。８１％８１１は制御信号分配用のスイッチで
あって、このスイッチ５ｘＳ−ｅｎを介して端子ＣＴＬ
から供給されるレベル比較回路■の出力が各制御分枝の
半固定抵抗器Ｒ１〜Ｒｎ及び半固定電源Ｅｌ〜Ｅｎ Ｋ
順次供給される。A specific example of the configuration of the above-mentioned gamma correction circuit αη is shown in FIG. In FIG. 2, the diode D1. Semi-fixed resistor R
1 and the semi-fixed power source E1 are connected in series to form a first control branch, which is connected in parallel with second to nth control branches having a similar configuration to form a known polygonal line approximation circuit. be done. 81% 811 is a switch for control signal distribution, and the terminal CTL is connected via this switch 5xS-en.
The output of the level comparator circuit supplied from
Supplied sequentially.
本実施例の動作は次のとおりである。The operation of this embodiment is as follows.
まず、切換スイッチａ＆が図示の切換え状態になされて
、階段波発生器αｌから基準階段波電圧ＳＲがガンマ補
正回路（１７）に供給される。基準階段波電圧ＳＲは同
−振幅及び同一時間幅Ｔのｎ個の単位階段８ｕ（Ｓｕｔ
〜Ｓｕｎ ）から構成される。First, the changeover switch a& is set to the illustrated switching state, and the reference staircase voltage SR is supplied from the staircase wave generator αl to the gamma correction circuit (17). The reference staircase wave voltage SR is composed of n unit steps 8u (Sut
~Sun).
ガンマ補正回路住ηの初期入出力特性が直線的であると
すれば、基準階段波電圧ＳＲは、利得制御増幅器叫及び
増幅器αυを介して、Ｂ Ｂ Ｒ（１）のグリッド（３
）に供給される。切換えスイッチ（１８）と連動し二ｌ
Ｂ Ｒ（１１のビーム電流は検出電極（４）に流入す
るようになされており、検出電極（４）罠は、単位階段
Ｓｕの時間幅Ｔ毎に、Ｅ Ｂ Ｒｔｌ）のガンマ特性に
応じて非直線的にその値が増大する階段波電流が得られ
る。検出電極（４）Ｋ得られた階段波電流ｉＢは増幅器
α滲を介して、階段波電圧ｅ包となってレベル比較器■
に供給され、基準階段波電圧ＳＲと対応する単位階段８
ｕｌ ％ ８ｕｎ ＠ Ｋレベルを比較される。Assuming that the initial input/output characteristics of the gamma correction circuit η are linear, the reference staircase wave voltage SR is applied to the grid (3) of BBR(1) via the gain control amplifier and the amplifier αυ.
). Interlocked with the changeover switch (18)
The beam current of B R (11) is configured to flow into the detection electrode (4), and the detection electrode (4) trap is activated depending on the gamma characteristics of E B Rtl for each time width T of the unit step Su. A step wave current whose value increases non-linearly is obtained. The staircase wave current iB obtained from the detection electrode (4) passes through the amplifier α and becomes a staircase wave voltage e, which is then sent to the level comparator ■
unit staircase 8 corresponding to the reference staircase voltage SR.
ul % 8un @K level is compared.
レベル比較器■の単位階段８ｕｔ ％ Ｓｕｎ毎の比較
出力Ｅｃはガンマ補正回路（１７１に供給されて、分配
スイッチ５ｌ−８ｎを介して、各制御分枝の半固定抵抗
器Ｒ１〜Ｒｎ及び半固定電源Ｅ１〜ＥｎＫ順次供給され
、増幅器（１４の出力である階段波電圧ｅＳと基準階段
波電圧ｓＨとのそれぞれ対応する単位階段毎に等レベル
となり、レベル比較器翰の単位階段毎の出力が零となる
ように、各半固定抵抗器Ｒ１〜Ｒｎ及び半固定電源Ｂ１
〜Ｂｎを制御する。The comparison output Ec for each unit step 8ut % of the level comparator The power supplies E1 to EnK are sequentially supplied, and the step wave voltage eS and the reference step wave voltage sH, which are the outputs of the amplifiers (14), are at the same level for each corresponding unit step, and the output of the level comparator for each unit step is zero. Each semi-fixed resistor R1 to Rn and semi-fixed power supply B1 are set so that
~Control Bn.
こうし【、ガンマ補正回路（１？）の入出力特性カーＥ
Ｂ Ｒ（１）の入出力特性に適合して設定されると、
切換スイッチ（１８１が図示とは逆の状態に接続され、
入力端子ＧＯからの映像信号がスイッチａＳ、ガンマ補
正回路卸、利得制御増幅器ａ５及び増幅器ａυを介して
Ｂ Ｂ Ｒ（１）のグリッド（３）に供給され、電子ビ
ームＢｒをスタイラスとしてフィルムＦに記録される。Input/output characteristics of the gamma correction circuit (1?)
When set to match the input/output characteristics of B R(1),
The changeover switch (181 is connected in the opposite state to that shown in the diagram,
The video signal from the input terminal GO is supplied to the grid (3) of the BBR (1) via the switch aS, the gamma correction circuit, the gain control amplifier a5, and the amplifier aυ, and the electron beam Br is applied to the film F using the stylus. recorded.
この場合、ビーム電流の最大値及び最小値は前述のよう
にして一定に保持されており、また、中間値は上述のよ
５Ｋして設定されたガンマ補正回路（１７）の入出力特
性によって規制されるので、動作初期のＢ Ｂ Ｒ（１
）の温度変化等に影響されることがない。In this case, the maximum and minimum values of the beam current are held constant as described above, and the intermediate value is regulated by the input/output characteristics of the gamma correction circuit (17) set at 5K as described above. Therefore, B B R (1
) is not affected by temperature changes, etc.
なお、上述のガンマ補正回路ｔ１７）は、第２図に示し
たものの他罠、演算増幅器を併用して構成することもで
きる。また、階段波に代えて、のこぎり波をガンマ補正
用の基準信号として用いることもできる。Note that the gamma correction circuit t17) described above can also be configured using a trap or an operational amplifier in addition to the one shown in FIG. Furthermore, instead of the staircase wave, a sawtooth wave can be used as a reference signal for gamma correction.
以上詳述のように、本発明によれば、電子ビーム録画装
置の毎使用時、予めガンマ補正を行なうと共に、記録動
作中にビーム電流の最大値、最小値を一定に維持するよ
うＫした【ので、動作初期の温度変化等によるビーム電
流の中間値の変動が除去され、画像の階調を正しく記録
することができる。As described in detail above, according to the present invention, gamma correction is performed in advance each time the electron beam recording device is used, and the maximum and minimum values of the beam current are maintained constant during the recording operation. Therefore, fluctuations in the intermediate value of the beam current due to temperature changes and the like at the initial stage of operation are removed, and the image gradation can be recorded correctly.
第１図は本発明による電子ビーム録画装置のビーム電流
制御回路の一実施例を示すブ四ツク図、第２図は第１図
の実施例の要部を示す結線図、第３図及び第４図はそれ
ぞれ従来の電子ビーム録画装置の構成例を示すブロック
図であ杢。
（１）は電子ビーム録画装置、（３）は入力電極、（４
）は検出電極、（１３１は最小値検出回路、αｅは最大
値検出回路、αηはガンマ補正回路、０は基準レベル信
号発生器、■はレベル比較回路である。FIG. 1 is a block diagram showing an embodiment of the beam current control circuit of an electron beam recording device according to the present invention, FIG. 2 is a wiring diagram showing main parts of the embodiment of FIG. 1, and FIGS. Figure 4 is a block diagram showing an example of the configuration of a conventional electron beam recording device. (1) is an electron beam recording device, (3) is an input electrode, (4
) is a detection electrode, (131 is a minimum value detection circuit, αe is a maximum value detection circuit, αη is a gamma correction circuit, 0 is a reference level signal generator, and ■ is a level comparison circuit.
Claims (1)
マ補正回路と、レベル比較回路とを具備し、上記基準レ
ベル信号発生器の出力を上記ガンマ補正回路を介して上
記電子ビーム録画装置の入力電極に供給すると共に、上
記電子ビーム録画装置の検出電極からの出力と上記基準
レベル信号発生器の出力とを上記レベル比較回路に供給
し、該レベル比較回路の出力によつて上記ガンマ補正回
路の特性を制御するようにしたことを特徴とする電子ビ
ーム録画装置のビーム電流制御回路。It comprises an electron beam recording device, a reference level signal generator, a gamma correction circuit, and a level comparison circuit, and the output of the reference level signal generator is connected to the input electrode of the electron beam recording device via the gamma correction circuit. At the same time, the output from the detection electrode of the electron beam recording device and the output of the reference level signal generator are supplied to the level comparison circuit, and the characteristics of the gamma correction circuit are determined by the output of the level comparison circuit. A beam current control circuit for an electron beam recording device, characterized in that the circuit controls:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59227497A JPH0693771B2 (en) | 1984-10-29 | 1984-10-29 | Beam current control circuit for electronic beam recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59227497A JPH0693771B2 (en) | 1984-10-29 | 1984-10-29 | Beam current control circuit for electronic beam recorder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61105983A true JPS61105983A (en) | 1986-05-24 |
| JPH0693771B2 JPH0693771B2 (en) | 1994-11-16 |
Family
ID=16861812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59227497A Expired - Lifetime JPH0693771B2 (en) | 1984-10-29 | 1984-10-29 | Beam current control circuit for electronic beam recorder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0693771B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6333078A (en) * | 1986-07-26 | 1988-02-12 | Sony Corp | Electron beam picture recorder |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5038451A (en) * | 1973-08-07 | 1975-04-09 | ||
| JPS511128A (en) * | 1974-06-21 | 1976-01-07 | Fuji Photo Film Co Ltd | Shashinyakitsukerokoryoseigyohoho |
| JPS51129118A (en) * | 1975-05-02 | 1976-11-10 | Sony Corp | Gamma correction circuit |
| JPS5430251A (en) * | 1977-08-10 | 1979-03-06 | Osamu Toyoda | Method of recovering protein from leather depilation processing waste liquid |
| US4300147A (en) * | 1979-03-26 | 1981-11-10 | Image Graphics, Inc. | System for accurately tracing with a charged particle beam on film |
| JPS5828699A (en) * | 1981-08-14 | 1983-02-19 | 株式会社東芝 | Feedwater control device for bwr type reactor |
| JPS58182377A (en) * | 1982-04-20 | 1983-10-25 | Sony Corp | Gradation converting method of video signal |
| JPS58196784A (en) * | 1982-05-12 | 1983-11-16 | Sony Corp | Gradation converting device of video signal |
| JPS59161189A (en) * | 1983-02-22 | 1984-09-11 | イメージ・グラフィクス・インコーポレテッド | Image strain correcting method and device |
| JPS6085689A (en) * | 1983-10-17 | 1985-05-15 | Dainippon Printing Co Ltd | Film gamma adjusting device |
-
1984
- 1984-10-29 JP JP59227497A patent/JPH0693771B2/en not_active Expired - Lifetime
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5038451A (en) * | 1973-08-07 | 1975-04-09 | ||
| JPS511128A (en) * | 1974-06-21 | 1976-01-07 | Fuji Photo Film Co Ltd | Shashinyakitsukerokoryoseigyohoho |
| JPS51129118A (en) * | 1975-05-02 | 1976-11-10 | Sony Corp | Gamma correction circuit |
| JPS5430251A (en) * | 1977-08-10 | 1979-03-06 | Osamu Toyoda | Method of recovering protein from leather depilation processing waste liquid |
| US4300147A (en) * | 1979-03-26 | 1981-11-10 | Image Graphics, Inc. | System for accurately tracing with a charged particle beam on film |
| JPS5828699A (en) * | 1981-08-14 | 1983-02-19 | 株式会社東芝 | Feedwater control device for bwr type reactor |
| JPS58182377A (en) * | 1982-04-20 | 1983-10-25 | Sony Corp | Gradation converting method of video signal |
| JPS58196784A (en) * | 1982-05-12 | 1983-11-16 | Sony Corp | Gradation converting device of video signal |
| JPS59161189A (en) * | 1983-02-22 | 1984-09-11 | イメージ・グラフィクス・インコーポレテッド | Image strain correcting method and device |
| JPS6085689A (en) * | 1983-10-17 | 1985-05-15 | Dainippon Printing Co Ltd | Film gamma adjusting device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6333078A (en) * | 1986-07-26 | 1988-02-12 | Sony Corp | Electron beam picture recorder |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0693771B2 (en) | 1994-11-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |