JP3770415B2 - Telecine device - Google Patents

Description

で表される。また発振器９１の出力電圧ｅ₂ と加算回路９２に供給される入力電圧ｅ₄ との関係は、抵抗Ｒ₂ 及び第２のコンデンサ７０Ｂ〜７３Ｂの静電容量Ｃ₂ を考慮して、次式
【数２】

で表される。
【００６５】
ところでこの場合、発振器９０及び９１の出力電圧ｅ₁ 及びｅ₂ は互いに逆相でなり、その電圧値をｅとした場合、それぞれ次式
【数３】

【数４】

という関係が得られ、また抵抗Ｒ₁ 及びＲ₂ は同一の抵抗値Ｒを有し、次式
【数５】

で表される。
【００６６】
ここで映画フイルム１では、その幅方向における各パーフオレーシヨン列３Ａ、３Ｂの外側の領域及び各パーフオレーシヨン２間の領域がトリアセテート（ＴＡＣ）又はポリエステル（ＰＥＴ）等の絶縁体から構成されている。因みに平行板コンデンサの静電容量は、一般的に両極板の対向面積及び極板間の絶縁体の誘電率に比例し、絶縁体の空気に対する比誘電率は比較的大きいことから極板間が空気のときよりも絶縁体が介挿されているときの方が高い値を示すという特徴がある。
【００６７】
従つて第１及び第２のコンデンサ７０Ａ〜７３Ａ及び７０Ｂ〜７３Ｂでは、映画フイルム１が間欠送りされる際に当該映画フイルム１の各パーフオレーシヨン２が第１及び第２の電極４８Ａ〜５１Ａ及び４８Ｂ〜５１Ｂ上に位置するか否かによつてそれぞれ静電容量が異なる値を示すこととなる。
【００６８】
このように第１のコンデンサ７０Ａ〜７３Ａの静電容量Ｃ₁ は、映画フイルム１の各パーフオレーシヨン２が第１の電極４８Ａ〜５１Ａに位置する場合、すなわち極板間が空気で満たされる場合に最大値を示し、これに対して映画フイルム１の各パーフオレーシヨン２が第１の電極４８Ａ〜５１Ａ上に位置しない場合すなわち極板間が絶縁体で満たされる場合に最小値を示す。
【００６９】
これと同様に、第２のコンデンサ７０Ｂ〜７３Ｂの静電容量Ｃ₂ も、映画フイルム１の各パーフオレーシヨン２が第２の電極４８Ｂ〜５１Ｂに位置する場合に最大値を示し、これに対して映画フイルム１の各パーフオレーシヨン２が第２の電極４８Ｂ〜５１Ｂ上に位置しない場合に最小値を示す。
【００７０】
従つて第１及び第２のコンデンサ７０Ａ〜７３Ａ及び７０Ｂ〜７３Ｂの静電容量Ｃ₁ 及びＣ₂ は、それぞれ極板間が空気で満たされたときの静電容量の値をＣとした場合に、当該各極板間に絶縁体が部分的又は全体的に介挿された場合の静１容量の変化量ΔＣ₁ 及びΔＣ₂ を加えた値からなり、それぞれ次式
【数６】

【数７】

で表される。
【００７１】
このようにして加算回路９２の出力電圧ｅ₀ は、発振器９０及び９１の出力電圧ｅ₁ 及びｅ₂ が互いに逆相でなることから、加算回路９２において入力電圧ｅ₃ 及びｅ₄ を加算することによつて得られ、式（３）〜式（７）を代入して、次式
【数８】

で表される。因みに実験結果によれば、第１及び第２のコンデンサ７０Ａ〜７３Ａ及び７０Ｂ〜７３Ｂの各極板面積の分解能は１〔μm 〕単位であり、すなわち１〔μm 〕につき１〔mv〕の電圧が変化することが知られている。
【００７２】
また、第１の検出回路３６Ａにおいては、発振器９５は抵抗Ｒ₃ を介して一端がグランド接続された第３のコンデンサ８０〜８２の他端と接続されている。この第３のコンデンサ８０〜８２では、映画フイルム１が間欠送りされる際に当該映画フイルム１の両縁部がそれぞれエツジ電極６２〜６４を２分割するように位置しており、このとき第３のコンデンサ８０〜８２からは、それぞれほぼ一定の静電容量に基づく幅方向検出信号Ｓ２Ａが出力される。
【００７３】
一方、第２の検出回路３６Ｂも第１の検出回路３６Ａと同一の構成からなり、加算回路９２からは第１及び第２のコンデンサ７４Ａ〜７７Ａ及び７４Ｂ〜７７Ｂの静電容量の差分に基づく差分信号ＳＢＴが同期検出部９３に供給される。同期検出部９３は、加算回路９２から与えられた出力電圧ｅ₀ でなる差分信号ＳＢＴを、発振器９０から与えられた出力電圧ｅ₁ でなる基準信号ＲＥＦに位相同期させた後、ＬＰＦ９４を介して長手方向検出信号Ｓ１Ｂとして出力する。また第３のコンデンサ８３〜８５からは、それぞれほぼ一定値を示す静電容量に基づく幅方向検出信号Ｓ２Ｂが出力される。
【００７４】
（３）光軸制御部の構成
図７は光軸制御部３２を示し、駆動制御部３５には差分検出部３６（図１）から長手方向検出信号Ｓ１及び幅方向検出信号Ｓ２が供給されると共に、主制御部３７（図１）から補正制御信号Ｓ３及びＳ４が供給される。
この場合、駆動制御部３５において、長手方向検出信号Ｓ１及び補正制御信号Ｓ３は増幅回路１００を介して増幅された後加算回路１０２に送出される。一方、幅方向検出信号Ｓ２及び補正制御信号Ｓ４は増幅回路１０１を介して増幅された後加算回路１０３に送出される。
【００７５】
加算回路１０２は、長手方向検出信号Ｓ１を補正制御信号Ｓ３に同期させて、これを同期出力信号Ｓ１０として増幅回路１０４を介して増幅した後ドライブ部１０５に送出する。また加算回路１０３は、幅方向検出信号Ｓ２を補正制御信号Ｓ４に同期させて、これを同期出力信号Ｓ１１として増幅回路１０６を介して増幅した後ドライブ部１０７に送出する。
【００７６】
ドライブ部１０５は、同期出力信号Ｓ１０に基づいて光軸補正部３４における投影光ビームＬ１の光軸の角度を変換させると共に、当該変換した角度情報を位置センサ１０８に送出する。またドライブ部１０７は、同期出力信号Ｓ１１に基づいて光軸補正部３４における投影光ビームＬ１の光軸の角度を変換させると共に、当該変換した角度情報を位置センサ１１０に送出する。
【００７７】
位置センサ１０８は、ドライブ部１０５から得られる角度情報に基づいて光軸の補正量を検出し、これを光軸補正検出信号Ｓ１２として増幅回路１０９を介して加算回路１０２に送出する。加算回路１０２は、補正制御信号Ｓ３に同期された長手方向検出信号Ｓ１に光軸補正検出信号Ｓ１２を加算して、映画フイルム１の長手方向の位置振れの信号レベルと当該位置振れに応じた光軸の補正量との差分を同期出力信号Ｓ１０として出力し、これによりドライブ部１０５は光軸が補正されるまで光軸の角度を変換する。
【００７８】
位置センサ１１０は、ドライブ部１０７から得られる角度情報に基づいて光軸の補正量を検出し、これを光軸補正検出信号Ｓ１３として増幅回路１１１を介して加算回路１０３に送出する。加算回路１０３は、補正制御信号Ｓ４に同期された幅方向検出信号Ｓ２に光軸補正検出信号Ｓ１３を加算して、映画フイルム１の幅方向の位置振れの信号レベルと当該位置振れに応じた光軸の補正量との差分を同期出力信号Ｓ１１として出力し、これによりドライブ部１０７は光軸が補正されるまで光軸の角度を変換する。
【００７９】
（４）光軸補正部の構成
ここで図７との対応部分に同一符号を付して示す図８において、光軸補正部３４は、第１及び第２の平板１３０及び１３１を有し、当該第１及び第２の平板１３０及び１３１は共に同一の屈折率を有する硝子部材によつて成形されている。
【００８０】
第１の平板１３０は、一側端部及び他側端部にそれぞれモータ（ドライブ部）１０５の出力軸を同軸とする軸棒１３２及び１３３が一体化して取り付けられ、当該軸棒１３２及び１３３を回動軸として第１の平板１３０を矢印ｃで示す方向又はこれとは逆方向に移動し得るようになされている。また軸棒１３２はモータ１０５の出力軸と連結されている。
【００８１】
第２の平板１３１は、一側端部及び他側端部にそれぞれモータ（ドライブ部）１０７の出力軸を同軸とする軸棒１３４及び１３５が一体化して取り付けられ、当該軸棒１３４及び１３５を回動軸として第２の平板１３１を矢印ｄで示す方向又はこれとは逆方向に移動し得るようになされている。また軸棒１３４はモータ１０７の出力軸と連結されている。
【００８２】
ここでモータ１０５及び１０７の出力軸は互いに垂直関係を有するようになされている。またモータ１０５には位置センサ１０８が設けられ、軸棒１３２の回転角に基づいて第１の平板１３０の移動量を検出し得、かくして投影光ビームＬ１の光軸の補正量を検出し得るようになされている。さらにモータ１０７には位置センサ１１０が設けられ、軸棒１３４の回転角に基づいて第２の平板１３１の移動量を検出し得、かくして投影光ビームＬ１の光軸の補正量を検出し得るようになされている。
【００８３】
図８に示す光軸補正部３４のうち第１の平板１３０を、投影光ビームＬ１の光軸（図示せず）とモータ１０５の出力軸とで形成される平面を断面にとつて図８に示す。図８において第１の平板１３０が、モータ１０５及び１０７の出力軸で形成される平面と平行になるような位置関係にあるとき、外側平面部１３０Ａ側の光軸Ｌ１Ｘと内側平面部１３０Ｂ側の光軸Ｌ１Ｙは共に一致する。
【００８４】
次に第１の平板１３０を軸棒１３２及び１３３を中心として矢印ｃで示す方向又はこれとは逆方向に回動移動させて外側平面部１３０Ａとモータ１０５及び１０７の出力軸で形成される平面とのなす角がθになるように傾けた場合、外側平面部１３０Ａ側の光軸Ｌ１Ｘは内側平面部１３０Ｂ側の光軸Ｌ１Ｙに対してｘだけモータ１０７の出力軸と平行方向に移動することとなる。
【００８５】
また図８に示す光軸補正部１０７のうち第２の平板１３１を、投影光ビームＬ１の光軸（図示せず）とモータ１０７の出力軸とで形成される平面を断面にとつた場合も図９と同様に示される。図９において第２の平板１３１が、モータ１０５及び１０７の出力軸で形成される平面と平行になるような位置関係にあるとき、外側平面部１３１Ａ側の光軸Ｌ１Ｘと内側平面部１３１Ｂ側の光軸Ｌ１Ｙは共に一致する。
【００８６】
次に第２の平板１３１を軸棒１３４及び１３５を中心として矢印ｄで示す方向又はこれとは逆方向に回動移動させて外側平面部１３１Ａとモータ１０５及び１０７の出力軸で形成される平面とのなす角がθになるように傾けた場合、外側平面部１３１Ａ側の光軸Ｌ１Ｘは内側平面部１３１Ｂ側の光軸Ｌ１Ｙに対してｘだけモータ１０５の出力軸と平行方向に移動することとなる。
【００８７】
ここで、第１及び第２の平板１３０及び１３１について、それぞれ硝子材の厚さをｄ、屈折率をｎとするとθとｘの間には、次式
【数９】

が成立する。この式（９）は、平行移動量ｘをθの関数として表され、θの値が小さい場合にはｘとθはほぼ比例関係となり、図１０に示すような屈折率ｎに応じて異なる直線Ｋ１０、Ｋ２０及びＫ３０で表される。この場合、直線Ｋ１０はｄ＝２、ｎ＝1.2 の場合を示し、直線Ｋ２０はｄ＝２、ｎ＝1.5 の場合を示し、直線Ｋ３０はｄ＝２、ｎ＝2.0 の場合を示す。例えば直線Ｋ２０上の点Ｐは、θを４°傾けたときには光軸Ｌ１Ｘがｘ＝0.05〔mm〕だけ平行移動することを表している。このようにｘとθの関数は、θの値が小さい場合にはｎの値が大きい程ｘの値が大きくなる。
【００８８】
（５）映像再生部における動作タイミング
次に図１１において、図１５と同様に２〜３欠き落とし方式を用いた場合の映像再生部３０（図１）における間欠送りスプロケツト１９、光軸補正部３４、投影シヤツタ２４及びカメラ部２９の動作タイミングを示す。
まず映画フイルム１は間欠送りスプロケツト１９によつて間欠送りされる際、時点ｔ₁ で映画フイルム１の欠き落としが開始される（図１１（Ａ））と共に投影シヤツタ２４が閉口状態となる（図１１（Ｂ））。
【００８９】
続いて、時点ｔ₂ で映画フイルム１の欠き落としが終了すると共に、当該時点ｔ₂ から時点ｔ₃ までの間に光軸補正部３４は、前期間における映画フイルム１（画像ＣＦ_Z のコマ部分）の各パーフオレーシヨン２及び両縁部の位置情報に基づいて投影光ビームＬ１の光軸の補正を行う（図１１（Ａ））。
一方、カメラ部２９は、時点ｔ₁ の直前の投影シヤツタ２４の開閉動作の間に取り込んでおいた１コマ分の画像ＣＦ_Z を時点ｔ₁ から時点ｔ₃ までの間に走査しておく（図１１（Ｃ））。
【００９０】
続いて、時点ｔ₃ で映画フイルム１の欠き落としが終了する（図１１（Ａ））と共に投影シヤツタ２４が開口状態となつた直後（約1/1200秒経過後）すぐに閉口状態となる（図１１（Ｂ））。この投影シヤツタ２４の開閉動作の間にカメラ部２９は、撮像素子２８に照射された映画フイルム１の透過光に基づく１コマ分の画像ＣＦ_A （画像ＣＦ_Z の次のコマ）を取り込むようにする（図１１（Ｃ））。
【００９１】
この後、時点ｔ₃ から時点ｔ₄ までの間にカメラ部２９は、取り込んだ１コマ分の画像ＣＦ_A を走査しておき（図１１（Ｃ））、この後、再び投影シヤツタ２４が時点ｔ₄ で閉口状態となるように開閉動作を行う（図１１（Ｂ））。
続いて時点ｔ₄ で映画フイルム１の欠き落としが開始されると共に、投影シヤツタ２４が閉口状態となる（図１１（Ｂ））。
【００９２】
続いて、時点ｔ₅ で映画フイルム１の欠き落としが終了すると共に、当該時点ｔ₅ から時点ｔ₆ までの間に光軸補正部３４は、前期間における映画フイルム１（画像ＣＦ_A のコマ部分）の各パーフオレーシヨン２及び両縁部の位置情報に基づいて投影光ビームＬ１の光軸の補正を行う（図１１（Ａ））。
一方、カメラ部２９は、時点ｔ₄ の直前の投影シヤツタ２４の開閉動作の間に再び取り込んでおいた１コマ分の画像ＣＦ_A を、時点ｔ₄ から時点ｔ₆ までの間に走査しておく（図１１（Ｃ））。
【００９３】
続いて、時点ｔ₆ で映画フイルム１の欠き落としが終了する（図１１（Ａ））と共に投影シヤツタ２４が開口状態となつた直後（約1/1200秒経過後）すぐに閉口状態となる（図１１（Ｂ））。この投影シヤツタ２４の開閉動作の間にカメラ部２９は、画像ＣＦ_A の次のコマに相当する１コマ分の画像ＣＦ_B を取り込むようにする（図１１（Ｃ））。
【００９４】
この後、時点ｔ₆ から時点ｔ₇ までの間に、カメラ部２９は取り込んだ１コマ分の画像ＣＦ_B を走査した後、２回目の投影シヤツタ２４の開閉動作に伴つて１コマ分の画像ＣＦ_B を取り込んで走査しておく（図１１（Ｃ））。さらにカメラ部２９は３回目の投影シヤツタ２４の開閉動作に伴つて１コマ分の画像ＣＦ_B を取り込んだ後（図１１（Ｃ））、当該投影シヤツタ２４は時点ｔ₇ で閉口状態となる（１１（Ｂ））と共に映画フイルム１の欠き落としが開始される（図１１（Ａ））。
【００９５】
以下同様にして、時点ｔ₇ 以後においても、上述のように映画フイルム１は２コマ毎に周期Ｔ１で繰り返して間欠送りされるようになされ、映画フイルム１の欠き落とし動作及び光軸補正動作を、それぞれ投影シヤツタ２４の開閉動作に同期させる。これにより、カメラ部２９は映画フイルム１における期間Ｔ１Ａ及びＴ１Ｂに割り当てられた各コマ分の画像を、それぞれ当該映画フイルム１の透過光の光軸が補正された状態で、それぞれ２フールド及び３フールドずつ走査し得るようになされている。
【００９６】
この場合、図１６との対応部分に同一符号を付して示す図１２において、投影シヤツタ２４は、位置Ａ₁ は図１１に示す時点ｔ₁ の位置に対応しており、以下順次矢印ａで示す方向に回転するに伴つて、位置Ｂ₁ 、Ａ₂ 、Ａ₃ 、Ｂ₂ 及びＡ₄ はそれぞれ時点ｔ₂ 、ｔ₃ 、ｔ₄ 、ｔ₅ 及びｔ₆ の位置に対応すると共に一周期後の位置Ａ₁ は時点ｔ₇ に対応する。この間に、投影シヤツタ２４は、時点ｔ₁ 〜ｔ₄ でなる期間Ｔ１Ａで開閉動作を２回行うと共に、時点ｔ₄ 〜ｔ₇ でなる期間Ｔ１Ｂで開閉動作を３回行うようになされている。
【００９７】
このとき期間Ｔ１Ａのうち時点ｔ₁ 〜ｔ₃ でなる期間Ｔ２（約1/72秒）は、投影シヤツタ２４における露光口２４Ａ及び２４Ｂ間すなわち位置Ａ₁ 及びＡ₂ 間に相当し、このうち時点ｔ₁ 及びｔ₂ でなる期間Ｔ２Ａ（約 1/100秒）で、間欠送りスプロケツト１９は１コマ分の欠き落とし動作を行つた後、時点ｔ₂ 及びｔ₃ でなる期間Ｔ２Ｂ（約 1/250秒）で、光軸補正部３４は当該欠き落とし動作された１コマ分に相当する映画フイルム１の透過光の光軸補正を行う。
【００９８】
また期間Ｔ１Ｂのうち時点ｔ₄ 〜ｔ₆ でなる期間Ｔ２（約1/72秒）は、投影シヤツタ２４における露光口２４Ｃ及び２４Ｄ間すなわち位置Ａ₃ 及びＡ₄ 間に相当し、このうち時点ｔ₄ 及びｔ₅ でなる期間Ｔ２Ａ（約 1/100秒）で、間欠送りスプロケツト１９は１コマ分の欠き落とし動作を行つた後、時点ｔ₅ 及びｔ₆ でなる期間Ｔ２Ｂ（約 1/250秒）で、光軸補正部３４は当該欠き落とし動作された１コマ分に相当する映画フイルム１の透過光の光軸補正を行う。
【００９９】
（６）実施例の動作
以上の構成において、テレシネ装置の映像再生部３０では、映画フイルム１が２コマ毎に周期Ｔ１で繰り返して間欠送りされる際に、当該各コマ毎にそれぞれ投影シヤツタ２４の開閉動作が２回及び３回行われるように、主制御部３７は投影シヤツタ２４の開閉動作に間欠送りスプロケツト１９による欠き落とし動作を同期させる。
【０１００】
このとき主制御部３７は、間欠送りスプロケツト１９による欠き落とし動作を投影シヤツタ２４の閉口状態から開口状態までの間に亘つて行うことなく、当該閉口状態から所定期間以内で欠き落とし動作を行わせた後、投影シヤツタ２４が開口状態となる前に、光軸補正部３４に映画フイルム１の透過光の光軸を補正するように動作させる。
【０１０１】
この結果、間欠送りスプロケツト１９による欠き落とし動作及び光軸補正部３４による光軸補正動作がそれぞれ投影シヤツタ２４の開閉動作に同期されることとなり、かくしてカメラ部２９は、投影シヤツタ２４の開閉動作に同期して、光軸補正動作が行われた各コマ分の画像を周期Ｔ１毎にそれぞれ２フイールド及び３フーイルド走査することができる。
【０１０２】
かくして映画フイルム１の走行方向及び又は幅方向に位置振れが生じた場合であつても、当該映画フイルム１の各コマ毎の画像に振れが生じるのを防止しながら、当該各コマ毎の画像を順次テレビ信号ＴＥＬに変換することができる。
【０１０３】
またゲート部３１のガイドシユー３３側に第１及び第２の電極４８Ａ〜５５Ａ及び４８Ｂ〜５５Ｂとエツジ電極６２〜６７とを設け、当該第１及び第２の電極４８Ａ〜５５Ａ及び４８Ｂ〜５５Ｂ並びにエツジ電極６２〜６７とスチールバンド１７とによつて第１〜第３のコンデンサ７０Ａ〜７７Ａ、７０Ｂ〜７７Ｂ及び８０〜８５を形成し、映画フイルム１の位置振れ量に応じて変化する第１〜第３のコンデンサ７０Ａ〜７７Ａ、７０Ｂ〜７７Ｂ及び８０〜８５の各静電容量の変化量に基づいて映画フイルム１の位置を検出するようにしたことにより、簡易な構成で映画フイルム１の位置検出の精度を向上させることができる。
【０１０４】
さらに光軸補正部３４としてそれぞれ光透過性をもつ第１及び第２の平板１３０及び１３１を組み合わせたものを用いたことにより、比較的構成及び機構が簡易となることから、装置全体として小型化及び軽量化することができ、かくして比較的高速に動作させることができる。
【０１０５】
（７）実施例の効果
以上の構成によれば、テレシネ装置の映像再生部３０においては、映画フイルム１を投影シヤツタ２４の開閉動作に同期させて間欠送りする際、当該投影シヤツタ２４の閉口状態から所定期間以内で間欠送りスプロケツト１９による欠き落とし動作を行わせた後、投影シヤツタ２４が開口状態となる前に、光軸補正部３４に光軸補正動作を行わせるようにしたことにより、映画フイルム１の走行方向及び又は幅方向に位置振れが生じた場合であつても、当該映画フイルム１の各コマ毎の画像に振れが生じるのを防止しながら、当該各コマ毎の画像を順次テレビ信号ＴＥＬに変換することができる。
【０１０６】
（８）他の実施例
なお上述の実施例においては、差分検出回路３６として図５に示す構成のものを用いた場合について述べたが、本発明はこれに限らず、第１及び第２のコンデンサ７０Ａ〜７７Ａ及び７０Ｂ〜７７Ｂの静電容量の差分に基づいて長手方向検出信号Ｓ１を出力し得ると共に、第３のコンデンサ８０〜８５の静電容量の変化に基づいて幅方向検出信号Ｓ２を出力し得るものであれば種々の構成からなる回路を適用し得る。
【０１０７】
例えば、図５の差分検出回路３６の第１の検出回路３６Ａにおいて、発振器９０及び９１に代えて単一の発振器（図示せず）を接続すると共に、加算回路９２に代えて差分回路（図示せず）を設けた場合、単一の発振器から互いに同相でなる出力電圧が減算回路に供給され、当該減算回路において減算されることにより、第１及び第２のコンデンサ７０Ａ〜７３Ａ及び７０Ｂ〜７３Ｂの静電容量の差分に基づく長手方向検出信号Ｓ１Ａを出力し得る。
【０１０８】
また上述の実施例においては、第１のガイド部でなるガイドシユー３３の位置検出面３３ＡＸ及び３３ＢＸに、それぞれ４個の第１及び第２の電極４８Ａ〜５５Ａ及び４８Ｂ〜５５Ｂと３個のエツジ電極６２〜６７とを配設した場合について述べたが、本発明はこれに限らず、各位置検出面３３ＡＸ及び３３ＢＸにおいて、第１及び第２の電極は各パーフオレーシヨン２と同じピツチでかつ当該各パーフオレーシヨンに対応してそれぞれ一対で配設されていれば３個以下又は５個以上であつても良く、またエツジ電極６２〜６７は３個以外の所定数配設するようにしても良い。
【０１０９】
さらに上述の実施例においては、ガイドシユー３３における位置検出面３３ＡＸ及び３３ＢＸの両方にそれぞれ第１及び第２の電極４８Ａ〜５５Ａ及び４８Ｂ〜５５Ｂとエツジ電極６２〜６７とを配設するようにした場合について述べたが、本発明はこれに限らず、位置検出面３３ＡＸ又は３３ＢＸの一方にこれら複数の電極を配設するようにしても良い。
【０１１０】
さらに上述の実施例においては、光軸補正部３４としてそれそれ光透過性をもつ第１及び第２の平板１３０及び１３１を組み合わせたものを用いた場合について述べたが、本発明はこれに限らず、平凸レンズ及び平凹レンズでなる２枚のレンズを組み合わせたもの（図示せず）及び音響光学光変調器（図示せず）等を用いても良く、要は投影光ビームＬ１の光軸の角度を変換し得るものであれば種々のものを適用し得る。
【０１１１】
さらに上述の実施例においては、光軸補正部３４を設けた場合について述べたが、本発明はこれに限らず、光軸補正部３４を取り除いて、ＣＣＤカメラ２６の撮像素子２８の照射面積を拡大するようにしても良い。この場合、当該拡大された撮像素子２８に照射された透過光に基づいて画面の切り出しを行うことにより、カメラ部２９において画面振れを補正するようにする。
【０１１２】
さらに上述の実施例においては、カメラ部２９で映画フイルム１に基づく画像を取り込んで走査するための所要時間が１フールド当たり約1/60秒となる場合について述べたが、本発明はこれに限らず、例えば映画フイルム１に基づく画像を取り込んで走査するための所要時間が１フールド当たり約1/48秒となる場合でも本発明を適用し得る。この場合、主制御部３７は投影シヤツタ２４の開閉動作に対する間欠送りスプロケツト１９による欠き落とし動作及び光軸補正部３４による光軸補正動作をカメラ部２９に設けられたメモリ（図示せず）に予めデータとして書き込んでおく。この後、映像再生時においてカメラ部２９は主制御部３７の制御に基づいて当該メモリから読み出したデータに基づいてテレビ信号ＴＥＬに変換するようにする。
【０１１３】
【発明の効果】
上述のように本発明によれば、映画フイルムの長手方向に沿つて複数形成された走行同期穴を介してスプロケツトの回転に同期させて映画フイルムを間欠的に停止させ、当該停止させた停止位置で光源からの光源光を映画フイルムの所定領域に照射して、映画フイルムの透過光に基づいてテレビ信号を生成するテレシネ装置において、同期制御手段は、シヤツタの開閉動作のタイミングに同期してスプロケツトを回転させる際、シヤツタの閉口状態からスプロケツトを回転させて映画フイルムを間欠的に停止した後、シヤツタが開口状態となる前に光軸補正手段に透過光の光軸を補正させることにより、映画フイルムに位置振れが生じた場合にも当該映画フイルムから得られる映像に振れが生じるのを防止しながら当該映像をテレビ信号に変換し得るテレシネ装置を実現することができる。
【図面の簡単な説明】
【図１】本発明の一実施例による映像再生部の構成を示すブロツク図である。
【図２】実施例によるガイドシユーの構成を示す部分的平面図である。
【図３】図２のガイドシユーの構成を示す拡大図である。
【図４】図３のガイドシユーの構成を示す断面図である。
【図５】実施例による差分検出回路の構成を示すブロツク図である。
【図６】図５の差分検出回路における静電容量の差分検出の説明に供するブロツク図である。
【図７】実施例による光軸制御部の構成を示すブロツク図である。
【図８】実施例による光軸補正部を示す斜視図である。
【図９】図８の光軸補正部による光軸補正の説明に供する断面図である。
【図１０】図９の光軸補正における平行移動量及び傾斜角の関係を表すグラフである。
【図１１】実施例による映像再生部における動作状態の説明に供する信号波形図である。
【図１２】実施例による投影シヤツタの説明に供する平面図である。
【図１３】従来の映画フイルムを示す平面図である。
【図１４】従来の映像再生部の構成を示すブロツク図である。
【図１５】従来の映像再生部における動作状態の説明に供する信号波形図である。
【図１６】従来の投影シヤツタの説明に供する平面図である。
【符号の説明】
１……映画フイルム、２……パーフオレーシヨン、３Ａ……第１のパーフオレーシヨン列、３Ｂ……第２のパーフオレーシヨン列、１０、３０……映像再生部、１３、３１……ゲート部、１５……ピクチヤゲート、１６……プレツシヤプレート、１７……スチールバンド、１８、３３……ガイドシユー、１９……間欠送りスプロケツト、２１……サーボモータ、２２……ランプハウスブロツク、２３……光源、２４……投影シヤツタ、２５……モータ、２６……ＣＣＤカメラ、２７……レンズ部、２８……撮像素子、２９……カメラ部、３２……光軸制御部、３４……光軸補正部、３５……駆動制御部、３６……差分検出回路、３７……主制御部、３８……サーボモータ制御部、３９……シヤツタモータ制御部。[0001]
【table of contents】
The present invention will be described in the following order.
TECHNICAL FIELD OF THE INVENTION
Conventional technology (FIGS. 13 and 14)
Problems to be Solved by the Invention (FIGS. 15 and 16)
Means for solving the problem
BEST MODE FOR CARRYING OUT THE INVENTION
(1) Configuration of video playback unit (Fig. 1)
(2) Configuration of the guide show (FIGS. 2 to 6)
(3) Configuration of optical axis controller (FIG. 7)
(4) Configuration of optical axis correction unit (FIGS. 8 to 10)
(5) Operation timing in the video playback unit (FIGS. 11 and 12)
(6) Operation of the embodiment
(7) Effects of the embodiment
(8) Other embodiments
The invention's effect
[0002]
BACKGROUND OF THE INVENTION
The present invention relates to a telecine apparatus, and is particularly suitable for application to an apparatus for converting video obtained from a movie film into a television signal.
[0003]
[Prior art]
2. Description of the Related Art Conventionally, as an apparatus for converting video obtained from this kind of movie film into a television signal, a telecine apparatus having a configuration in which a projector and a television apparatus are combined is used.
[0004]
Here, as shown in FIG. 13, a 35 [mm] movie film 1 used in a movie theater has a feed hole (hereinafter referred to as this) for running synchronization at both ends in the width direction of the movie film 1. Each of the two perforations (hereinafter referred to as “perforation”) 2 is sequentially provided at predetermined intervals (for example, 19.05 [mm] per frame and four perforations per frame). These are referred to as first and second perforation rows, respectively). Audio information consisting of images and analog signals is optically stored in the corresponding recording areas 4 and 5 respectively on the inner portions sandwiched between 3A and 3B. It is recorded.
[0005]
When the movie film 1 is run, as shown in FIG. 14, the video reproducing unit 10 in the telecine device (not shown) is supplied from the supply reel through the sprocket 11 and the sprocket shout 12. Are sequentially fed to the take-up reel through the gate portion 13 and the intermittent feeding portion 14.
[0006]
Here, the gate portion 13 is configured to sandwich the movie film 1 between the picture gate 15 and the pressure plate 16, and a steel band 17 is provided on the surface of the picture gate 15 facing the movie film 1. On the surface of the pressure plate 16 facing the movie film 1, a guide shoe 18 having a curved surface is provided.
[0007]
The intermittent feed section 14 sandwiches the movie film 1 between an intermittent feed sprocket (hereinafter referred to as an intermittent feed sprocket) 19 and an intermittent feed sprocket shout (hereinafter referred to as an intermittent feed shroud) 20. It consists of the following.
In this case, the intermittent feed sprocket 19 in the intermittent feed section 14 is sequentially rotated by a predetermined angle at a predetermined timing based on the drive control of the servo motor 21 in the reproduction mode, whereby each image recording area 4 ( 13) intermittently feeds the movie film 1 to the gate unit 13 so as to stop instantaneously (for example, at a rate of 24 times / second).
[0008]
At this time, the gate portion 13 is configured so that both end portions in the width direction of the movie film 1 are sandwiched between the steel band 17 and the guide shoe 18 while the movie film 1 is traveling.
[0009]
At this time, the lamp house part 22 is disposed on the left side of the picture gate 15 in the video reproducing part 10, and a light beam for projection from the light source 23 in the lamp house part 22 (hereinafter referred to as a projection light beam). L1 is fired and enters the movie film 1 through a picture aperture (not shown) provided on the surface of the projection shutter 24 and the picture gate 15 facing the movie film 1. Here, the projection shutter 24 provided in the lamp house section 22 repeats opening and closing in conjunction with the intermittent feeding operation of the movie film 1 based on the drive control of the motor 25.
[0010]
Further, in the video reproduction unit 12, the transmitted light obtained by transmitting the projection light beam L1 through each image recording area 4 of the movie film 1 is used as a picture aperture (provided on the surface of the pressure plate 16 facing the movie film 1). The image sensor 28 in the CCD camera body 26A is irradiated through the lens unit 27 of the CCD camera 26 and a lens unit 27 of the CCD camera 26 so that an image based on the imaging result of the image sensor 28 is displayed on the camera unit 29 as a television signal. After being converted to TEL, it is output to the outside.
[0011]
Thus, the television signal TEL output from the CCD camera 26 is supplied to a television device (not shown) provided outside, and an image based on the television signal TEL can be displayed on the screen in the television device.
[0012]
[Problems to be solved by the invention]
By the way, in the video reproduction unit 10 in this telecine apparatus, it is necessary to synchronize the timing at which the movie film 1 is intermittently fed and the timing at which the camera unit 29 scans when converting the video based on the movie film 1 into the television signal TEL. For this reason, unlike the case of using a normal projector, a so-called 2-3 dropout method is used.
[0013]
According to this 2-3 dropout method, the movie film 1 of 1/24 seconds per frame is intermittently fed every two frames at a period T1, and the film film 1 is delivered twice during the period T1. By dividing into two parts, a period T1A of about 1/20 second and a period T1B of about 1/30 second at a ratio of 2: 3 so as to be missing, the time required for scanning by taking in the camera unit 29 is 1 It is designed to be synchronized with an image of about 1/60 second per field.
[0014]
FIG. 15 shows the operation timing of the intermittent feed sprocket 19, the projection shutter 24, and the camera unit 29 in the video playback unit 10 when this 2-3 dropout method is used. First, when the film 1 is intermittently fed by the intermittent feed sprocket 19, the time t ₁ Then, the movie film 1 is started to be removed (FIG. 15A) and the projection shutter 24 is closed (FIG. 15B). At this time, the camera unit 29 ₁ Image CF for one frame based on the transmitted light of the movie film 1 that was captured immediately before _Z At time t ₁ To time t ₂ Scan until 1/72 seconds (FIG. 15C).
[0015]
Subsequently, time t ₂ Then, the film film 1 is completely removed (FIG. 15A) and immediately after the projection shutter 24 is opened (after about 1/1200 seconds have elapsed), the film is immediately closed (FIG. 15B). . During the opening / closing operation of the projection shutter 24, the camera unit 29 displays an image CF for one frame based on the transmitted light of the movie film 1 irradiated on the image sensor 28. _A (Image CF _Z Next frame) is taken in (FIG. 15C).
[0016]
After this time t ₂ To time t _Three Until the camera unit 29 captures one frame of image CF _A (FIG. 15C), and after that, the projection shutter 24 again moves to the time t. _Three Then, an opening / closing operation is performed so as to be in a closed state (FIG. 15B).
Followed by time t _Three Then, the movie film 1 is started to be removed, and the projection shutter 24 is closed (FIG. 15B). At this time, the camera unit 29 _{3 1} Image CF for one frame that was captured again immediately before _A At time t _Three To time t _Four Scan until 1/72 seconds (FIG. 15C).
[0017]
Subsequently, time t _Four Then, the film film 1 is completely removed (FIG. 15A), and immediately after the projection shutter 24 is opened (after about 1/1200 seconds have elapsed), the film is immediately closed (FIG. 15B). . During the opening / closing operation of the projection shutter 24, the camera unit 29 _A Image CF for one frame corresponding to the next frame _B (Fig. 15C).
[0018]
After this time t _Four To time t _Five In the meantime, the camera unit 29 captures one frame of image CF _B , The image CF for one frame is accompanied by the opening / closing operation of the projection shutter 24 for the second time. _B Are scanned in advance (FIG. 15C). Further, the camera unit 29 performs image CF for one frame in accordance with the third opening / closing operation of the projection shutter 24. _B (FIG. 15C), the projection shutter 24 _Five Then, the closed state (15 (B)) is started, and the movie film 1 is started to be removed (FIG. 15 (A)).
[0019]
Similarly, time t _Five Thereafter, as described above, the movie film 1 is repeatedly fed every two frames at a cycle T1, and the camera film 1 is synchronized with the opening / closing operation of the projection shutter 24 by synchronizing the dropping operation of the movie film 1 with the camera. The unit 29 can scan the image for each frame assigned to the periods T1A and T1B by 2 fields and 3 fields, respectively.
[0020]
In this case, as shown in FIG. 16, the projection shutter 24 has a disk shape and is rotated in the direction indicated by the arrow a, so that the rotation time of the projection shutter 24 and the period T1 are the same. The rotation speed of the motor 25 is set. In the projection shutter 24, exposure ports 24A to 24E are formed at predetermined positions on the outer peripheral side obtained by dividing the central angle into five parts with the central position O of the output shaft of the motor 25 as a reference.
[0021]
In the projection shutter 24, the position A ₁ Is the time t shown in FIG. ₁ The position A corresponds to the position A as it rotates in the direction indicated by the arrow a. ₂ ~ A _Four Is the time t ₂ ~ T _Four And position A after one cycle ₁ Is the time t _Five Corresponding to During this time, the projection shutter 24 is at time t. ₁ ~ T _Three The opening / closing operation is performed twice in a period T1A consisting of _Three ~ T _Five The opening / closing operation is performed three times during the period T1B.
[0022]
At this time, the intermittent feed sprocket 19 is set at time t1 in the period T1A. ₁ And t ₂ During the period T2, the dropout operation for one frame is performed, and at the time t in the period T1B _Three And t _Four The missing operation for one frame continuing in the period T2 is performed.
[0023]
In this way, when the movie film 1 is repeatedly intermittently sent every two frames at the cycle T1, the projection shutter 24 is operated so that the projection shutter 24 is opened and closed twice and three times for each frame. Is synchronized with the opening / closing operation of the movie film 1. As a result, the camera unit 29 is exposed twice and three times by the projection shutter 24, and in synchronization with the opening / closing operation of the projection shutter 24, the image for each frame is displayed in two fields and three fields per frame. Can be scanned.
[0024]
By the way, in practice, in the gate section 13 of the video reproducing section 10, the area outside the perforation rows 3A and 3B in the width direction of the movie film 1 and the area between the perforation 2 in the width direction of the movie film 1 by the guide 18 is a steel band. The film film 1 is prevented from being displaced in the longitudinal direction, that is, the traveling direction by being pressed against the film 17.
[0025]
As a result, when the movie film 1 is intermittently fed by the intermittent feed sprocket 19, the position where the video film 1 stops instantaneously in the gate portion 13 as the intermittent feed sprocket 19 rotates can be stabilized. As a result, it is possible to prevent the image based on the imaging result by the imaging device 28 of the CCD camera 26 from being shaken.
[0026]
However, when the movie film 1 is intermittently fed, relative friction is likely to occur between the first and second perforation rows 3A, 3B and the guide shoe 18 and / or the steel band 17, so that the movie film 1 travels. There was a problem that the first and second perforation rows 3A and 3B were liable to cause many scratches. Further, due to the relationship with the surface state of the movie film 1, there is a problem that it is difficult to keep the stop position of the movie film 1 in the gate portion 13 in a stable state when intermittently feeding.
[0027]
In addition, when the position of the movie film 1 is shifted in the width direction, there is a possibility that the image obtained via the CCD camera 26 may be shaken. Therefore, the movie film 1 is sandwiched in the gate portion 13 from the width direction. By providing a guide (not shown), the movie film 1 is prevented from swinging in the width direction. However, there is a case where the movie film 1 is displaced in the width direction due to a gap generated between the movie film 1 and the guide. As a result, the image based on the image pickup result by the image pickup device 28 of the CCD camera 26 is shaken. There is a fear.
[0028]
In particular, today, when there are many opportunities to use movie films as materials for TV movie programs, images obtained through the CCD camera 26 when using a telecine device are more than images recorded using a video camera. The reality is that the runout is large and unstable.
[0029]
The present invention has been made in consideration of the above points, and even when a position fluctuation occurs in a movie film, the image obtained from the movie film is converted into a TV signal while preventing the image from being shaken. It is intended to propose a telecine device to obtain.
[0030]
[Means for Solving the Problems]
In order to solve such a problem, in the present invention, the movie film is intermittently stopped in synchronization with the rotation of the sprocket through a plurality of travel synchronization holes formed along the longitudinal direction of the movie film. At the stop position In a telecine device that irradiates a predetermined area of a movie film with light from the light source and generates a television signal based on the transmitted light of the movie film, irradiates the predetermined area of the movie film with the light source light from the light source at a predetermined timing. The shutter that opens and closes, the photoelectric conversion means that generates the television signal based on the transmitted light of the movie film, and the timing at which the photoelectric conversion means generates the television signal is synchronized with the timing of the opening and closing operation of the shutter. Also Position fluctuation of the above film film at the stop position with reference to the picture aperture. Amount Based on the above traveling synchronization hole After detection, the optical axis of the transmitted light is corrected according to the detection result. At this time, the synchronization control means When rotating the sprocket in synchronization with the timing of the shutter opening / closing operation, the sprocket is rotated from the closed state of the shutter to stop the movie film intermittently, and before the shutter is opened. The optical axis correction means is made to correct the optical axis of the transmitted light.
[0032]
As described above, the synchronization control means rotates the sprocket in synchronization with the shutter opening / closing operation timing and causes the optical axis correction means to correct the optical axis of the transmitted light, thereby causing a positional fluctuation in the movie film. However, the photoelectric conversion means can convert the video into a television signal while preventing the video obtained from the movie film from shaking.
[0033]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
[0034]
(1) Configuration of video playback unit
In FIG. 1, in which the same reference numerals are assigned to the parts corresponding to those in FIG. 14, the video playback unit 30 in the telecine device (not shown) is different from the conventional video playback unit 10 in the configuration of the gate unit 31. An optical axis correction unit 34 of the optical axis control unit 32 is provided between the gate unit 31 and the lens unit 27.
[0035]
The gate portion 31 sandwiches the first and second perforation rows 3A and 3B of the movie film 1 between the steel band 17 and the guide shoe 33, thereby stopping the movie film 1 from the stop position with respect to the picture aperture. Each of the perforations 2 can detect the amount of positional fluctuation in the longitudinal direction and the width direction.
[0036]
The optical axis control unit 32 includes an optical axis correction unit 34 and a drive control unit 35, and the drive control unit 35 determines the optical axis correction unit 34 based on the position shake amount of the movie film 1 detected by the gate unit 31. By controlling the above, the optical axis correction unit 34 converts the angle of the optical axis of the projection light beam L1.
[0037]
Here, when the movie film 1 is intermittently fed, the gate unit 31 detects the positional deviation amount in the longitudinal direction of the movie film 1 and then sends the longitudinal direction detection signal S1 obtained through the difference detection unit 36 to the main control unit 37. And sent to the drive control unit 35. At the same time, the gate unit 31 detects the amount of positional fluctuation in the width direction of the movie film 1 and then sends a width direction detection signal S 2 obtained via the difference detection circuit 36 to the main control unit 37 and the drive control unit 35.
[0038]
Here, the main control unit 37 outputs correction control signals S3 and S4 to the drive control unit 35 when the movie film 1 is running, that is, when the projection shutter 24 is in the closed state. The drive control unit 35 has two drive units (not shown). Based on the correction control signals S3 and S4 given from the main control unit 37, the drive control unit 35 receives the longitudinal direction detection signal S1 and the width direction detection signal S2. By supplying to each drive unit in synchronization with the correction control signals S3 and S4, the angle of the optical axis of the projection beam L1 in the optical axis correction unit 34 is converted through the drive unit until it is corrected.
[0039]
The main control section 37 sends control signals S5 and S6 to the servo motor control section 38 and the shutter motor control section 39, respectively, and sends a synchronization control signal S7 to the camera section 29. Thus, the servo motor control unit 38 controls the servo motor 21 to sequentially rotate by a predetermined angle at a predetermined timing based on the control signal S5, and the shutter motor control unit 39 controls the motor 25 based on the control signal S6. Are controlled so as to be sequentially rotated by a predetermined angle at a predetermined timing.
[0040]
At this time, the servo motor 21 and the motor 25 are driven and controlled so as to be synchronized with each other at a predetermined timing, and thus the operation of removing the movie film 1 and the opening / closing operation of the projection shutter 24 can be synchronized with each other at a predetermined timing.
[0041]
Further, the camera unit 29 outputs, based on the synchronization control signal S7, images based on the transmitted light of the movie film 1 irradiated to the image sensor 28 at predetermined timings at predetermined timings synchronized with the rotational drive of the servo motor 21 and the motor 25. It is designed to scan.
[0042]
(2) Configuration of guide show
Here, the gate portion 31 has substantially the same configuration as that of the conventional gate portion 13 (FIG. 14) except that the configuration of the guide shoe 33 is different. That is, as shown in FIG. 2, the guide shoe 33 is made of, for example, a conductive member such as stainless steel, and is a surface located on both ends of the center of the picture plate aperture 16A of the pressure plate 16 on the opposed surfaces 33A and 33B of the movie film 1. 33AX and 33BX (hereinafter referred to as position detection surfaces, respectively) are formed so as to be widened outward so that the width is wider than that of the movie film 1.
[0043]
In this case, the steel band 17 has been formed with a sufficiently wide width so that the position detection surfaces 33AX and 33BX of the guide shoe 33 can sufficiently abut against the entire position detection surfaces 33AX and 33BX. Yes.
[0044]
In each of the position detection surfaces 33AX and 33BX, a plurality of grooves (not shown) are formed at predetermined intervals along the first and second perforation rows 3A and 3B of the movie film 1, respectively. Insulating members 40 to 47 made of glass or the like are filled. A pair of plate-like electrodes 48 to 55 are embedded in these insulating members 40 to 47 so as to expose their surfaces and not to be electrically connected to the position detection surfaces 33AX and 33BX.
[0045]
In addition, a plurality of grooves (not shown) are formed at predetermined intervals along both edge portions of the movie film 1 on the position detection surfaces 33AX and 33BX, and the insulating members 56 to 61 correspond to the plurality of grooves, respectively. Is filled. In each of these insulating members 56 to 61, one plate electrode 62 to 67 is embedded so as to expose the surface thereof and not to be electrically connected to the position detection surfaces 33AX and 33BX.
[0046]
In this case, the insulating members 40 to 47 and the plurality of plate electrodes 48 to 55 embedded in the insulating members 40 to 47 and the insulating members 56 to 61 and the plurality of plate electrodes embedded in the insulating members 56 to 61 are used. 62 to 67 are processed smoothly so as not to have irregularities on the position detection surfaces 33AX and 33BX, respectively, so that relative friction is caused on the first and second perforation rows 3A and 3B while the movie film 1 is running. It is possible to prevent the occurrence of scratches caused by the above.
[0047]
Specifically, as shown in FIG. 3, on one position detection surface 33AX of the guide show 33, four insulations with the same pitch as each perforation 2 along the first perforation row 3A of the movie film 1 are provided. Members 70 to 73 are embedded, and a pair of plate electrodes (hereinafter referred to as first and second electrodes, respectively) 78A to 81A and 78B to 81B are provided corresponding to the insulating members 70 to 73, respectively. It has been.
[0048]
In this case, the length of the first and second electrodes 48 </ b> A to 51 </ b> A and 48 </ b> B to 51 </ b> B in the traveling direction of the movie film 1 is previously set so as to be shorter than the length of one end 2 </ b> B in the width direction of each perforation 2. Is set. The intervals between the first and second electrodes 48 </ b> A to 51 </ b> A and 48 </ b> B to 51 </ b> B are set in advance so as to be shorter than the length of the end portion 2 </ b> B in the width direction of each perforation 2.
[0049]
As a result, when the intermittently fed movie film 1 is instantaneously stopped, each perforation 2 contacts between the first and second electrodes 48A to 51A and 48B to 51B, respectively (FIG. 3) Each perforation 2 is in contact only with the first and second electrodes 48A to 51A and 48B to 51B and the insulating members 40 to 43, and the first and second electrodes 48A to 51A and 48B to It does not contact the position detection surface 33AX made of a conductive member other than 51B.
[0050]
Therefore, in FIG. 4 in which the guide shoe 33 of FIG. 3 is taken along the line AA ′, when the movie film 1 is sandwiched between the guide shoe 33 and the steel band 17, the steel band 17 is made of a conductive member, and Since the first and second electrodes 48A to 51A and 48B to 51B are processed smoothly so as not to be uneven with the position detection surface 33AX, the steel band 17 and the first and second electrodes 48A to 51A are formed. And 48B to 51B form parallel plate capacitors (hereinafter referred to as first and second capacitors, respectively) 70A to 73A and 70B to 73B.
[0051]
Incidentally, although the position detection surface 33AX has a slightly curved shape, the length of the first and second electrodes 48A to 51A and 48B to 51B in the running direction of the movie film 1 is very short as a whole. The second electrodes 48A to 51A and 48B to 51B and the steel band 17 can be treated as parallel.
[0052]
Similarly, on the other position detection surface 33BX of the guide shoe 33, when the movie film 1 is sandwiched between the guide shoe 33 and the steel band 17, the steel band 17 is made of a conductive member and a plurality of plate-like electrodes 52 to 55 is processed smoothly so as not to have unevenness on the position detection surface 33BX, and the first and second plates made of parallel plate capacitors are formed by the steel band 17 and the plurality of plate-like electrodes 52 to 55, respectively. Two capacitors (not shown) are formed.
[0053]
On the other hand, as shown in FIG. 3, on one position detection surface 33AX of the guide shoe 33, one corresponding to each of the three insulating members 56 to 58 embedded at a predetermined interval along the edge of the movie film 1. Plate-like electrodes (hereinafter referred to as edge electrodes) 62 to 64 are provided.
[0054]
In this case, the edge electrodes 62 to 64 are set in advance so as to be substantially line symmetric about the edge of the movie film 1. As a result, during the intermittent feeding of the movie film 1, the movie film 1 always abuts only about half of the edge electrodes 62-64.
[0055]
Therefore, when the movie film 1 is sandwiched between the guide shoe 33 and the steel band 17, the steel band 17 is made of a conductive member, and the plurality of edge electrodes 62 to 64 are not uneven with the position detection surface 33AX. Since it is processed smoothly, a parallel plate capacitor (hereinafter referred to as a third capacitor) (not shown) is formed by the steel band 17 and the edge electrodes 62 to 64, respectively.
[0056]
Incidentally, the position detection surface 33AX has a slightly curved shape, but the length of the edge electrodes 62 to 64 in the running direction of the movie film 1 is very short as a whole, so that the edge electrodes 62 to 64 and the steel band 17 are Can be treated as parallel.
[0057]
Similarly, on the other position detection surface 33BX of the guide shoe 33, when the movie film 1 is sandwiched between the guide shoe 33 and the steel band 17, the steel band 17 is made of a conductive member and a plurality of plate-like electrodes 52 to Each of the third capacitors 55 is processed smoothly so as not to have irregularities on the position detection surface 33BX. Therefore, a third capacitor composed of a parallel plate capacitor is formed by the steel band 17 and the plurality of plate-like electrodes 52 to 55. (Not shown).
[0058]
In FIG. 5, the configuration of the guide show 33 and the difference detection circuit 36 is shown.
When the movie film 1 is sandwiched between the position detection surfaces 33AX and 33BX of the guide shoe 33 and the steel band 17 (FIG. 1), the steel band 17 and the first and second electrodes 48A to 55A and 48B to 55B form first and second capacitors 70A to 77A and 70B to 77B, respectively.
[0059]
At this time, in the first and second capacitors 70A to 77A and 70B to 77B, the steel band 17 is connected to the ground, and the first and second electrodes 48A to 55A and 48B to 55B are connected to the difference detection circuit 36, respectively. The first and second detection circuits 36A and 36B are electrically connected to each other.
[0060]
In the third capacitors 80 to 85, the steel band 17 is connected to the ground, and the edge electrodes 62 to 67 are electrically connected to the main control unit 37 and the drive control unit 35 (FIG. 1).
[0061]
Here, in the first detection circuit 36A, the oscillator 90 has a resistance R ₁ And is connected to the adder circuit 92 via the resistor R ₁ And the adder circuit 92 are connected to the other ends of the first capacitors 70A to 73A, one end of which is ground-connected. The oscillator 91 has a resistance R. ₂ And is connected to the adder circuit 92 via the resistor R ₂ And the adder circuit 92 are connected to the other ends of the second capacitors 70B to 73B having one end connected to the ground.
[0062]
A difference signal SBT based on the difference between the capacitances of the first and second capacitors 70 </ b> A to 73 </ b> A and 70 </ b> B to 73 </ b> B is supplied from the adder circuit 92 to the synchronization detection unit 93. The synchronization detection unit 93 outputs the output voltage e given from the addition circuit 92. ₀ The differential signal SBT is expressed by the output voltage e given from the oscillator 90. ₁ Is phase-synchronized with the reference signal REF, and is output as a longitudinal direction detection signal S1A via a low-pass filter (LPF) 94.
[0063]
In this case, the output voltage e of the adder circuit 92 in FIG. ₀ Changes based on the difference in capacitance between the first and second capacitors 70A to 73A and 70B to 73B. Hereinafter, the output voltage e of the adder circuit 92 will be described. ₀ Will be described.
[0064]
First, the output voltage e of the oscillator 90 ₁ And the input voltage e supplied to the adding circuit 92 _Three Is the resistance R ₁ And the capacitance C of the first capacitors 70A to 73A ₁ In consideration of
[Expression 1]

It is represented by The output voltage e of the oscillator 91 ₂ And the input voltage e supplied to the adding circuit 92 _Four Is the resistance R ₂ And the capacitance C of the second capacitors 70B to 73B ₂ In consideration of
[Expression 2]

It is represented by
[0065]
In this case, the output voltages e of the oscillators 90 and 91 are as follows. ₁ And e ₂ Are in opposite phase to each other, and when the voltage value is e,
[Equation 3]

[Expression 4]

And the resistance R ₁ And R ₂ Have the same resistance value R, and
[Equation 5]

It is represented by
[0066]
Here, in the movie film 1, the outer region of each perforation row 3A, 3B in the width direction and the region between each perforation 2 are made of an insulator such as triacetate (TAC) or polyester (PET). Yes. Incidentally, the capacitance of a parallel plate capacitor is generally proportional to the opposing area of both plates and the dielectric constant of the insulator between the plates, and since the relative dielectric constant of the insulator to air is relatively large, there is a gap between the plates. There is a feature that the value is higher when an insulator is inserted than when air is used.
[0067]
Therefore, in the first and second capacitors 70A to 73A and 70B to 73B, when the movie film 1 is intermittently fed, each perforation 2 of the movie film 1 is moved to the first and second electrodes 48A to 51A. Depending on whether or not it is located on 48B to 51B, the capacitances will show different values.
[0068]
Thus, the capacitance C of the first capacitors 70A to 73A ₁ Shows the maximum value when each perforation 2 of the movie film 1 is located at the first electrodes 48A to 51A, that is, when the gap between the plates is filled with air, whereas each perforation of the movie film 1 is The minimum value is shown when the oscillation 2 is not positioned on the first electrodes 48A to 51A, that is, when the gap between the electrode plates is filled with an insulator.
[0069]
Similarly, the capacitance C of the second capacitors 70B to 73B ₂ In addition, the maximum value is shown when each perforation 2 of the movie film 1 is positioned at the second electrodes 48B to 51B, whereas each perforation 2 of the movie film 1 has the second electrodes 48B to 51B. The minimum value is shown when not positioned above.
[0070]
Accordingly, the capacitance C of the first and second capacitors 70A to 73A and 70B to 73B. ₁ And C ₂ Is a static 1 capacitance when an insulator is partially or wholly inserted between each electrode plate, where C is the value of the capacitance when each electrode plate is filled with air. Change ΔC ₁ And ΔC ₂ Each of which is
[Formula 6]

[Expression 7]

It is represented by
[0071]
In this way, the output voltage e of the adding circuit 92 ₀ Is the output voltage e of the oscillators 90 and 91 ₁ And e ₂ Are in reverse phase with each other. _Three And e _Four Is obtained by substituting Equations (3) to (7) and
[Equation 8]

It is represented by Incidentally, according to the experimental results, the resolution of the electrode plate areas of the first and second capacitors 70A to 73A and 70B to 73B is 1 [μm], that is, a voltage of 1 [mv] per 1 [μm]. It is known to change.
[0072]
Further, in the first detection circuit 36A, the oscillator 95 has a resistance R _Three Is connected to the other ends of the third capacitors 80 to 82 whose one ends are connected to the ground. In the third capacitors 80 to 82, when the movie film 1 is intermittently fed, both edges of the movie film 1 are positioned so as to divide the edge electrodes 62 to 64 into two, respectively. Each of the capacitors 80 to 82 outputs a width direction detection signal S2A based on a substantially constant capacitance.
[0073]
On the other hand, the second detection circuit 36B also has the same configuration as the first detection circuit 36A, and the addition circuit 92 determines the difference based on the difference in capacitance between the first and second capacitors 74A to 77A and 74B to 77B. The signal SBT is supplied to the synchronization detector 93. The synchronization detection unit 93 outputs the output voltage e given from the addition circuit 92. ₀ The differential signal SBT is expressed by the output voltage e given from the oscillator 90. ₁ After being phase-synchronized with the reference signal REF consisting of In addition, the third capacitors 83 to 85 output a width direction detection signal S2B based on a capacitance indicating a substantially constant value.
[0074]
(3) Configuration of optical axis controller
7 shows the optical axis control unit 32. The drive control unit 35 is supplied with the longitudinal direction detection signal S1 and the width direction detection signal S2 from the difference detection unit 36 (FIG. 1), and at the same time the main control unit 37 (FIG. 1). ) To supply correction control signals S3 and S4.
In this case, in the drive control unit 35, the longitudinal direction detection signal S 1 and the correction control signal S 3 are amplified via the amplifier circuit 100 and then sent to the adder circuit 102. On the other hand, the width direction detection signal S <b> 2 and the correction control signal S <b> 4 are amplified via the amplifier circuit 101 and then sent to the adder circuit 103.
[0075]
The adder circuit 102 synchronizes the longitudinal direction detection signal S1 with the correction control signal S3, amplifies the detected signal as a synchronous output signal S10 via the amplifier circuit 104, and sends the amplified signal to the drive unit 105. Further, the adder circuit 103 synchronizes the width direction detection signal S2 with the correction control signal S4, amplifies it as a synchronous output signal S11 via the amplifier circuit 106, and sends it to the drive unit 107.
[0076]
The drive unit 105 converts the angle of the optical axis of the projection light beam L1 in the optical axis correction unit 34 based on the synchronization output signal S10, and sends the converted angle information to the position sensor 108. In addition, the drive unit 107 converts the angle of the optical axis of the projection light beam L1 in the optical axis correction unit 34 based on the synchronization output signal S11, and sends the converted angle information to the position sensor 110.
[0077]
The position sensor 108 detects the optical axis correction amount based on the angle information obtained from the drive unit 105, and sends this to the adder circuit 102 via the amplifier circuit 109 as an optical axis correction detection signal S12. The adder circuit 102 adds the optical axis correction detection signal S12 to the longitudinal direction detection signal S1 synchronized with the correction control signal S3, and the light level corresponding to the position shake signal level in the longitudinal direction of the movie film 1 and the light corresponding to the position shake. The difference from the correction amount of the axis is output as a synchronous output signal S10, whereby the drive unit 105 converts the angle of the optical axis until the optical axis is corrected.
[0078]
The position sensor 110 detects the optical axis correction amount based on the angle information obtained from the drive unit 107, and sends this to the adder circuit 103 via the amplifier circuit 111 as an optical axis correction detection signal S13. The adder circuit 103 adds the optical axis correction detection signal S13 to the width direction detection signal S2 synchronized with the correction control signal S4, and the light according to the signal level of the position shake in the width direction of the movie film 1 and the position shake. The difference from the correction amount of the axis is output as a synchronous output signal S11, whereby the drive unit 107 converts the angle of the optical axis until the optical axis is corrected.
[0079]
(4) Configuration of optical axis correction unit
Here, in FIG. 8, in which parts corresponding to those in FIG. 7 are denoted by the same reference numerals, the optical axis correction unit 34 includes first and second flat plates 130 and 131, and the first and second flat plates 130. And 131 are formed of a glass member having the same refractive index.
[0080]
The first flat plate 130 is integrally attached to one end portion and the other end portion with shaft rods 132 and 133 having the same output shaft of the motor (drive unit) 105 as the shaft rods 132 and 133. The first flat plate 130 can be moved as a rotation axis in the direction indicated by the arrow c or in the opposite direction. The shaft bar 132 is connected to the output shaft of the motor 105.
[0081]
The second flat plate 131 is integrally attached to one end portion and the other end portion with shaft rods 134 and 135 having the same output shaft of the motor (drive unit) 107 as the coaxial shafts 134 and 135. The second flat plate 131 can be moved as a rotation axis in the direction indicated by the arrow d or in the opposite direction. The shaft bar 134 is connected to the output shaft of the motor 107.
[0082]
Here, the output shafts of the motors 105 and 107 have a vertical relationship with each other. Further, the position sensor 108 is provided in the motor 105 so that the movement amount of the first flat plate 130 can be detected based on the rotation angle of the shaft bar 132, and thus the correction amount of the optical axis of the projection light beam L1 can be detected. Has been made. Further, the motor 107 is provided with a position sensor 110 so that the movement amount of the second flat plate 131 can be detected based on the rotation angle of the shaft bar 134, and thus the correction amount of the optical axis of the projection light beam L1 can be detected. Has been made.
[0083]
The first flat plate 130 of the optical axis correction unit 34 shown in FIG. 8 is shown in FIG. 8 with a cross section taken along the plane formed by the optical axis (not shown) of the projection light beam L1 and the output axis of the motor 105. Show. In FIG. 8, when the first flat plate 130 is in a positional relationship parallel to the plane formed by the output shafts of the motors 105 and 107, the optical axis L1X on the outer plane portion 130A side and the inner plane portion 130B side are arranged. The optical axes L1Y coincide with each other.
[0084]
Next, the first flat plate 130 is rotated about the shaft rods 132 and 133 in the direction indicated by the arrow c or in the opposite direction to the plane formed by the outer flat portion 130A and the output shafts of the motors 105 and 107. When the optical axis L1X on the outer plane portion 130A side is tilted so as to be θ, the optical axis L1X on the outer plane portion 130B side moves in the direction parallel to the output axis of the motor 107 by x with respect to the optical axis L1Y on the inner plane portion 130B side It becomes.
[0085]
In addition, the second flat plate 131 of the optical axis correction unit 107 shown in FIG. 8 may have a cross section taken along the plane formed by the optical axis (not shown) of the projection light beam L1 and the output axis of the motor 107. It is shown similarly to FIG. In FIG. 9, when the second flat plate 131 is in a positional relationship parallel to the plane formed by the output shafts of the motors 105 and 107, the optical axis L1X on the outer plane portion 131A side and the inner plane portion 131B side The optical axes L1Y coincide with each other.
[0086]
Next, the second flat plate 131 is rotated around the shaft bars 134 and 135 in the direction indicated by the arrow d or in the opposite direction to the plane formed by the outer flat surface portion 131A and the output shafts of the motors 105 and 107. The optical axis L1X on the outer plane portion 131A side moves in a direction parallel to the output axis of the motor 105 by x with respect to the optical axis L1Y on the inner plane portion 131B side. It becomes.
[0087]
Here, for the first and second flat plates 130 and 131, the thickness of the glass material is d and the refractive index is n.
[Equation 9]

Is established. This equation (9) expresses the parallel movement amount x as a function of θ. When the value of θ is small, x and θ are substantially proportional to each other, and a straight line that varies depending on the refractive index n as shown in FIG. It is represented by K10, K20 and K30. In this case, the straight line K10 shows the case of d = 2 and n = 1.2, the straight line K20 shows the case of d = 2 and n = 1.5, and the straight line K30 shows the case of d = 2 and n = 2.0. For example, the point P on the straight line K20 represents that the optical axis L1X is translated by x = 0.05 [mm] when θ is inclined by 4 °. Thus, in the function of x and θ, when the value of θ is small, the value of x increases as the value of n increases.
[0088]
(5) Operation timing in the video playback unit
Next, in FIG. 11, as in FIG. 15, the intermittent feed sprocket 19, the optical axis correction unit 34, the projection shutter 24, and the camera unit 29 in the video reproduction unit 30 (FIG. 1) when the 2-3 dropout method is used. Indicates the operation timing.
First, when the film 1 is intermittently fed by the intermittent feed sprocket 19, the time t ₁ Then, the movie film 1 is started to be removed (FIG. 11A) and the projection shutter 24 is closed (FIG. 11B).
[0089]
Subsequently, time t ₂ At this point, the film film 1 has been removed, and the time t ₂ To time t _Three In the meantime, the optical axis correction unit 34 performs the movie film 1 (image CF in the previous period). _Z The optical axis of the projection light beam L1 is corrected on the basis of the position information of each perforation 2 and both edge portions (FIG. 11A).
On the other hand, the camera unit 29 ₁ The image CF for one frame captured during the opening / closing operation of the projection shutter 24 immediately before _Z At time t ₁ To time t _Three Scanning is performed before (FIG. 11C).
[0090]
Subsequently, time t _Three Then, the movie film 1 is completely removed (FIG. 11A), and immediately after the projection shutter 24 is opened (after about 1/1200 seconds have elapsed), the film is immediately closed (FIG. 11B). . During the opening / closing operation of the projection shutter 24, the camera unit 29 displays an image CF for one frame based on the transmitted light of the movie film 1 irradiated on the image sensor 28. _A (Image CF _Z Next frame) is taken in (FIG. 11C).
[0091]
After this time t _Three To time t _Four Until the camera unit 29 captures one frame of image CF _A (FIG. 11 (C)), and then the projection shutter 24 again moves to the time t. _Four Then, an opening / closing operation is performed so as to be in a closed state (FIG. 11B).
Followed by time t _Four Then, the movie film 1 is started to be removed, and the projection shutter 24 is closed (FIG. 11B).
[0092]
Subsequently, time t _Five At this point, the film film 1 has been removed, and the time t _Five To time t ₆ In the meantime, the optical axis correction unit 34 performs the movie film 1 (image CF in the previous period). _A The optical axis of the projection light beam L1 is corrected on the basis of the position information of each perforation 2 and both edge portions (FIG. 11A).
On the other hand, the camera unit 29 _Four The image CF for one frame that was captured again during the opening / closing operation of the projection shutter 24 immediately before _A At time t _Four To time t ₆ Scanning is performed before (FIG. 11C).
[0093]
Subsequently, time t ₆ Then, the movie film 1 is completely removed (FIG. 11A), and immediately after the projection shutter 24 is opened (after about 1/1200 seconds have elapsed), the film is immediately closed (FIG. 11B). . During the opening / closing operation of the projection shutter 24, the camera unit 29 _A Image CF for one frame corresponding to the next frame _B Is taken in (FIG. 11C).
[0094]
After this time t ₆ To time t ₇ In the meantime, the camera unit 29 captures one frame of image CF _B , The image CF for one frame is accompanied by the opening / closing operation of the projection shutter 24 for the second time. _B Are scanned in advance (FIG. 11C). Further, the camera unit 29 performs image CF for one frame in accordance with the third opening / closing operation of the projection shutter 24. _B (FIG. 11C), the projection shutter 24 takes the time t. ₇ Then, the closed state (11 (B)) is started, and the movie film 1 is started to be removed (FIG. 11 (A)).
[0095]
Similarly, time t ₇ Thereafter, as described above, the movie film 1 is repeatedly fed intermittently every two frames at the cycle T1, and the film film 1 dropping operation and the optical axis correcting operation are respectively performed by the projection shutter 24 opening / closing operation. Synchronize with. As a result, the camera unit 29 converts the images of the frames assigned to the periods T1A and T1B in the movie film 1 to 2 fields and 3 fields, respectively, with the optical axis of the transmitted light of the movie film 1 being corrected. It can be scanned one by one.
[0096]
In this case, in FIG. 12, in which parts corresponding to those in FIG. ₁ Is the time t shown in FIG. ₁ The position B corresponds to the position B as it rotates in the direction indicated by the arrow a. ₁ , A ₂ , A _Three , B ₂ And A _Four Is the time t ₂ , T _Three , T _Four , T _Five And t ₆ And position A after one cycle ₁ Is the time t ₇ Corresponding to During this time, the projection shutter 24 is at time t. ₁ ~ T _Four The opening / closing operation is performed twice in a period T1A consisting of _Four ~ T ₇ The opening / closing operation is performed three times during the period T1B.
[0097]
At this time, time t1 in the period T1A ₁ ~ T _Three A period T2 (about 1/72 second) is defined between the exposure openings 24A and 24B in the projection shutter 24, that is, the position A. ₁ And A ₂ Of which time t ₁ And t ₂ After a period T2A (about 1/100 second), the intermittent feed sprocket 19 performs a dropout operation for one frame, and then the time t ₂ And t _Three In the period T2B (approximately 1/250 seconds), the optical axis correction unit 34 corrects the optical axis of the transmitted light of the movie film 1 corresponding to one frame that has been dropped.
[0098]
In addition, the time point t in the period T1B _Four ~ T ₆ A period T2 (about 1/72 second) is defined between the exposure openings 24C and 24D in the projection shutter 24, that is, the position A. _Three And A _Four Of which time t _Four And t _Five After a period T2A (about 1/100 second), the intermittent feed sprocket 19 performs a dropout operation for one frame, and then the time t _Five And t ₆ In the period T2B (approximately 1/250 seconds), the optical axis correction unit 34 corrects the optical axis of the transmitted light of the movie film 1 corresponding to one frame that has been dropped.
[0099]
(6) Operation of the embodiment
In the above configuration, in the video playback unit 30 of the telecine device, when the movie film 1 is repeatedly intermittently sent every two frames at the cycle T1, the opening / closing operation of the projection shutter 24 is performed twice for each frame. The main control unit 37 synchronizes the dropping operation by the intermittent feed sprocket 19 with the opening / closing operation of the projection shutter 24 so as to be performed three times.
[0100]
At this time, the main control unit 37 does not perform the drop operation by the intermittent feed sprocket 19 from the closed state to the open state of the projection shutter 24, and performs the drop operation within a predetermined period from the closed state. After that, before the projection shutter 24 is opened, the optical axis correction unit 34 is operated to correct the optical axis of the transmitted light of the movie film 1.
[0101]
As a result, the dropout operation by the intermittent feed sprocket 19 and the optical axis correction operation by the optical axis correction unit 34 are synchronized with the opening / closing operation of the projection shutter 24, and thus the camera unit 29 performs the opening / closing operation of the projection shutter 24. In synchronism, the images for each frame on which the optical axis correction operation has been performed can be scanned by 2 fields and 3 fields, respectively, every period T1.
[0102]
In this way, even when a position shake occurs in the traveling direction and / or the width direction of the movie film 1, the image for each frame is displayed while preventing the image for each frame of the movie film 1 from being shaken. It can be sequentially converted into a television signal TEL.
[0103]
Further, first and second electrodes 48A to 55A and 48B to 55B and edge electrodes 62 to 67 are provided on the guide shoe 33 side of the gate portion 31, and the first and second electrodes 48A to 55A and 48B to 55B and the edge are provided. The first to third capacitors 70A to 77A, 70B to 77B, and 80 to 85 are formed by the electrodes 62 to 67 and the steel band 17, and the first to first capacitors that change in accordance with the position shake amount of the movie film 1 are formed. The position of the movie film 1 can be detected with a simple configuration by detecting the position of the movie film 1 based on the amount of change in capacitance of each of the three capacitors 70A to 77A, 70B to 77B, and 80 to 85. Accuracy can be improved.
[0104]
In addition, since the optical axis correction unit 34 is a combination of the first and second flat plates 130 and 131 having optical transparency, the configuration and mechanism are relatively simple. And can be reduced in weight, and thus can be operated at a relatively high speed.
[0105]
(7) Effects of the embodiment
According to the above configuration, in the video playback unit 30 of the telecine apparatus, when the movie film 1 is intermittently fed in synchronization with the opening / closing operation of the projection shutter 24, the movie playback 1 is intermittently fed within a predetermined period from the closed state of the projection shutter 24. Since the optical axis correction unit 34 performs the optical axis correction operation after the projection operation by the sprocket 19 and before the projection shutter 24 is opened, the traveling direction of the movie film 1 and / or Even in the case where a position shake occurs in the width direction, it is possible to sequentially convert the image for each frame into a television signal TEL while preventing the image for each frame of the movie film 1 from being shaken. it can.
[0106]
(8) Other embodiments
In the above-described embodiment, the case where the difference detection circuit 36 having the configuration shown in FIG. 5 is used has been described. However, the present invention is not limited to this, and the first and second capacitors 70A to 77A and 70B to As long as the longitudinal direction detection signal S1 can be output based on the difference in the electrostatic capacity of 77B and the width direction detection signal S2 can be output based on the change in the electrostatic capacity of the third capacitors 80 to 85. Circuits having various configurations can be applied.
[0107]
For example, in the first detection circuit 36A of the difference detection circuit 36 of FIG. 5, a single oscillator (not shown) is connected instead of the oscillators 90 and 91, and a difference circuit (not shown) is substituted for the adder circuit 92. 1), the output voltages having the same phase as each other are supplied from a single oscillator to the subtraction circuit, and are subtracted in the subtraction circuit, whereby the first and second capacitors 70A to 73A and 70B to 73B are subtracted. The longitudinal direction detection signal S1A based on the difference in capacitance can be output.
[0108]
In the above-described embodiment, four first and second electrodes 48A to 55A and 48B to 55B and three edge electrodes are provided on the position detection surfaces 33AX and 33BX of the guide shoe 33, which is the first guide portion, respectively. Although the present invention is not limited to this, the first and second electrodes of the position detection surfaces 33AX and 33BX have the same pitch as each perforation 2 and If a pair is provided corresponding to each perforation, three or less or five or more edge electrodes 62 to 67 may be provided, and a predetermined number other than three may be provided. good.
[0109]
Further, in the above-described embodiment, the first and second electrodes 48A to 55A and 48B to 55B and the edge electrodes 62 to 67 are disposed on both the position detection surfaces 33AX and 33BX of the guide shoe 33, respectively. However, the present invention is not limited to this, and the plurality of electrodes may be disposed on one of the position detection surfaces 33AX or 33BX.
[0110]
Further, in the above-described embodiment, the case where the optical axis correction unit 34 is a combination of the first and second flat plates 130 and 131 each having light transmittance is described. However, the present invention is not limited to this. Alternatively, a combination of two lenses including a plano-convex lens and a plano-concave lens (not shown), an acousto-optic light modulator (not shown), or the like may be used. In short, the optical axis of the projection light beam L1 may be used. Various things can be applied as long as the angle can be changed.
[0111]
Further, in the above-described embodiment, the case where the optical axis correction unit 34 is provided has been described. However, the present invention is not limited to this, and the irradiation area of the image sensor 28 of the CCD camera 26 is reduced by removing the optical axis correction unit 34. You may make it expand. In this case, the camera unit 29 corrects screen shake by cutting out the screen based on the transmitted light applied to the enlarged image sensor 28.
[0112]
Further, in the above-described embodiment, the case has been described in which the time required for capturing and scanning an image based on the movie film 1 by the camera unit 29 is about 1/60 second per field. However, the present invention is not limited to this. For example, the present invention can be applied even when the time required for capturing and scanning an image based on the movie film 1 is about 1/48 second per field. In this case, the main control unit 37 performs in advance a memory (not shown) provided in the camera unit 29 with a dropout operation by the intermittent feed sprocket 19 for the opening / closing operation of the projection shutter 24 and an optical axis correction operation by the optical axis correction unit 34. Write as data. Thereafter, at the time of video reproduction, the camera unit 29 converts it into a television signal TEL based on the data read from the memory under the control of the main control unit 37.
[0113]
【The invention's effect】
As described above, according to the present invention, the movie film is intermittently stopped in synchronization with the rotation of the sprocket through the plurality of travel synchronization holes formed along the longitudinal direction of the movie film. At the stop position In a telecine apparatus that irradiates a predetermined area of a movie film with light from a light source and generates a television signal based on the transmitted light of the movie film, the synchronization control means includes: When rotating the sprocket in synchronization with the timing of the shutter opening / closing operation, the sprocket is rotated from the closed state of the shutter to stop the movie film intermittently, and before the shutter is opened. By making the optical axis correction means correct the optical axis of the transmitted light, even if a position fluctuation occurs in the movie film, the image obtained from the movie film is converted to a TV signal while preventing the image from being shaken. A telecine device that can be used can be realized.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a video reproduction unit according to an embodiment of the present invention.
FIG. 2 is a partial plan view showing the structure of a guide show according to an embodiment.
FIG. 3 is an enlarged view showing the configuration of the guide show in FIG. 2;
4 is a cross-sectional view showing a configuration of the guide shoe of FIG. 3;
FIG. 5 is a block diagram showing a configuration of a difference detection circuit according to the embodiment.
6 is a block diagram for explanation of capacitance difference detection in the difference detection circuit of FIG. 5; FIG.
FIG. 7 is a block diagram showing a configuration of an optical axis control unit according to the embodiment.
FIG. 8 is a perspective view illustrating an optical axis correction unit according to an embodiment.
FIG. 9 is a cross-sectional view for explaining optical axis correction by the optical axis correction unit in FIG. 8;
10 is a graph showing the relationship between the amount of parallel movement and the tilt angle in the optical axis correction of FIG.
FIG. 11 is a signal waveform diagram for explaining an operation state in the video reproduction unit according to the embodiment.
FIG. 12 is a plan view for explaining a projection shutter according to an embodiment.
FIG. 13 is a plan view showing a conventional movie film.
FIG. 14 is a block diagram showing a configuration of a conventional video reproduction unit.
FIG. 15 is a signal waveform diagram for explaining an operation state in a conventional video reproduction unit.
FIG. 16 is a plan view for explaining a conventional projection shutter.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Movie film, 2 ... Perforation, 3A ... 1st perforation row, 3B ... 2nd perforation row, 10, 30 ... Image reproduction part, 13, 31 ... Gate 15 ... Picture gate, 16 ... Pressure plate, 17 ... Steel band, 18, 33 ... Guide shout, 19 ... Intermittent feed sprocket, 21 ... Servo motor, 22 ... Ramp house block, 23 ... ... light source, 24 ... projection shutter, 25 ... motor, 26 ... CCD camera, 27 ... lens section, 28 ... imaging device, 29 ... camera section, 32 ... optical axis control section, 34 ... light Axis correction unit, 35 ... drive control unit, 36 ... difference detection circuit, 37 ... main control unit, 38 ... servo motor control unit, 39 ... shutter motor control unit.

Claims (2)

The movie film is intermittently stopped in synchronization with the rotation of the sprocket through a plurality of travel synchronization holes formed along the longitudinal direction of the movie film, and the light source light from the light source at the stop position is stopped. In a telecine device that irradiates a predetermined area of a film and generates a television signal based on the transmitted light of the movie film,
A shutter that opens and closes to emit the light source light from the light source to the predetermined area of the movie film at a predetermined timing;
Photoelectric conversion means for generating the television signal based on the transmitted light of the movie film;
Synchronization control means for synchronizing the timing at which the photoelectric conversion means generates the television signal with the timing of the opening / closing operation of the shutter;
Film position detecting means for detecting a position fluctuation amount of the movie film at the stop position with respect to a picture aperture based on the traveling synchronization hole ;
Optical axis correction means for correcting the optical axis of the transmitted light in accordance with the detection result of the film position detection means,
When the sprocket is rotated in synchronization with the opening / closing operation timing of the shutter, the synchronization control means rotates the sprocket from the closed state of the shutter to stop the movie film intermittently, and then the shutter The telecine apparatus, wherein the optical axis correction unit corrects the optical axis of the transmitted light before the opening state is reached. The film position detecting means includes
A first guide portion made of a conductive material for sandwiching the movie film;
A second guide portion provided with a plurality of electrodes on the surface for sandwiching the movie film;
With
2. The telecine apparatus according to claim 1, wherein the amount of positional shake is detected by measuring a capacitance of the electrode that changes in accordance with a position of the traveling synchronization hole .

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