JPS5488151A - Protection circuit for acousto-optic modulator - Google Patents

Protection circuit for acousto-optic modulator

Info

Publication number
JPS5488151A
JPS5488151A JP15682977A JP15682977A JPS5488151A JP S5488151 A JPS5488151 A JP S5488151A JP 15682977 A JP15682977 A JP 15682977A JP 15682977 A JP15682977 A JP 15682977A JP S5488151 A JPS5488151 A JP S5488151A
Authority
JP
Japan
Prior art keywords
acousto
optic modulator
peak
signal
amplifier
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.)
Pending
Application number
JP15682977A
Other languages
Japanese (ja)
Inventor
Masaaki Mori
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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 by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP15682977A priority Critical patent/JPS5488151A/en
Publication of JPS5488151A publication Critical patent/JPS5488151A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To surely protect the acousto-optic modulator by branching part of the signal being applied from a power amplifier to the acousto-optic modulator, peak- detecting the same, comparing and amplifying the output there of with a reference voltage and gain-controlling the input signal of the power aamplifier.
CONSTITUTION: The carrier from a carrier oscillator 1 is modulated by the picture signal fs by a modulator 2, passes through a gain control circuit 11 and is aiplified in a power amplifier 3, after which it is applied via directional coupler 5 to an acousto-optic modulator 4. At the same time, part of the output signal of the power amplifier 3 is branched by the directional coupler 5 and the peak value thereof is detected with a peak detecotor 12. The output signal of the peak detector 12 is compared and amplified with a reference voltage 14 in a comparing amplifier 13. The output of the comparing amplifier 13 is led to the gain control circuit 11, which lowers the input voltage of the acousto-optic modulator 4 and protects the acousto- optic modulator 4 against excessive input power when any excessive input voltage is applied to the acousto-optic modulator 4.
COPYRIGHT: (C)1979,JPO&Japio
JP15682977A 1977-12-26 1977-12-26 Protection circuit for acousto-optic modulator Pending JPS5488151A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15682977A JPS5488151A (en) 1977-12-26 1977-12-26 Protection circuit for acousto-optic modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15682977A JPS5488151A (en) 1977-12-26 1977-12-26 Protection circuit for acousto-optic modulator

Publications (1)

Publication Number Publication Date
JPS5488151A true JPS5488151A (en) 1979-07-13

Family

ID=15636253

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15682977A Pending JPS5488151A (en) 1977-12-26 1977-12-26 Protection circuit for acousto-optic modulator

Country Status (1)

Country Link
JP (1) JPS5488151A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101197032B1 (en) 2009-12-08 2012-11-06 (주) 인티그럴 Protection circuit for high power amplifiers
JP2016087676A (en) * 2014-11-10 2016-05-23 パナソニックＩｐマネジメント株式会社 Laser processing apparatus and laser processing method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101197032B1 (en) 2009-12-08 2012-11-06 (주) 인티그럴 Protection circuit for high power amplifiers
JP2016087676A (en) * 2014-11-10 2016-05-23 パナソニックＩｐマネジメント株式会社 Laser processing apparatus and laser processing method

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