JPH0314634U - - Google Patents

Info

Publication number
JPH0314634U
JPH0314634U JP6675290U JP6675290U JPH0314634U JP H0314634 U JPH0314634 U JP H0314634U JP 6675290 U JP6675290 U JP 6675290U JP 6675290 U JP6675290 U JP 6675290U JP H0314634 U JPH0314634 U JP H0314634U
Authority
JP
Japan
Prior art keywords
time
lamp
subject
power source
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP6675290U
Other languages
Japanese (ja)
Other versions
JPH0535386Y2 (en
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP1990066752U priority Critical patent/JPH0535386Y2/ja
Publication of JPH0314634U publication Critical patent/JPH0314634U/ja
Application granted granted Critical
Publication of JPH0535386Y2 publication Critical patent/JPH0535386Y2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Description

【図面の簡単な説明】[Brief explanation of drawings]

図は、本考案の一実施例の電気的回路図である
。 １……電源、４……ランプ、５……トランジス
タ、１３……コンパレータ、１４，１５……コン
デンサ、１７……フオトダイオード、２１，２２
……トランジスタ、２４……コンパレータ、２５
……トランジスタ。 The figure is an electrical circuit diagram of an embodiment of the present invention. 1... Power supply, 4... Lamp, 5... Transistor, 13... Comparator, 14, 15... Capacitor, 17... Photo diode, 21, 22
...Transistor, 24...Comparator, 25
...Transistor.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] ビデオ撮影用カメラなどの撮影用カメラととも
に使用するものであつて、ランプと、直流電源と
、上記ランプと直流電源との間に接続され、直流
電源からランプへの電力供給をオン、オフするス
イツチング回路と、このスイツチング回路のオフ
時間をランプが消灯しない程度の短い時間に固定
して、被写体までの距離に応じて近いときオン時
間を短く、遠いときオン時間を長く前記スイツチ
ング回路を制御する制御回路とを有することを特
徴とする撮影用光源。 A switch that is used with a camera such as a video camera and is connected between a lamp, a DC power source, and the lamp and the DC power source, and turns on and off the power supply from the DC power source to the lamp. A control circuit that controls the switching circuit by fixing the off-time of the switching circuit to a short time such that the lamp does not go out, and controlling the on-time to shorten the on-time when the subject is close and lengthen the on-time when the subject is far away, depending on the distance to the subject. A photographic light source characterized by having a circuit.
JP1990066752U 1990-06-26 1990-06-26 Expired - Lifetime JPH0535386Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1990066752U JPH0535386Y2 (en) 1990-06-26 1990-06-26

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1990066752U JPH0535386Y2 (en) 1990-06-26 1990-06-26

Publications (2)

Publication Number Publication Date
JPH0314634U true JPH0314634U (en) 1991-02-14
JPH0535386Y2 JPH0535386Y2 (en) 1993-09-08

Family

ID=31599728

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1990066752U Expired - Lifetime JPH0535386Y2 (en) 1990-06-26 1990-06-26

Country Status (1)

Country Link
JP (1) JPH0535386Y2 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5531274U (en) * 1978-08-23 1980-02-28
JPS5722262A (en) * 1980-07-15 1982-02-05 Toshiba Corp Exposure control device for copying machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5531274U (en) * 1978-08-23 1980-02-28
JPS5722262A (en) * 1980-07-15 1982-02-05 Toshiba Corp Exposure control device for copying machine

Also Published As

Publication number Publication date
JPH0535386Y2 (en) 1993-09-08

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