JPS5640334A - Indoor information transmission system - Google Patents

Indoor information transmission system

Info

Publication number
JPS5640334A
JPS5640334A JP11636579A JP11636579A JPS5640334A JP S5640334 A JPS5640334 A JP S5640334A JP 11636579 A JP11636579 A JP 11636579A JP 11636579 A JP11636579 A JP 11636579A JP S5640334 A JPS5640334 A JP S5640334A
Authority
JP
Japan
Prior art keywords
information
modulation
converting part
light
information transmission
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
JP11636579A
Other languages
Japanese (ja)
Inventor
Daisuke Yoshida
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.)
Komatsu Ltd
Original Assignee
Komatsu 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 Komatsu Ltd filed Critical Komatsu Ltd
Priority to JP11636579A priority Critical patent/JPS5640334A/en
Publication of JPS5640334A publication Critical patent/JPS5640334A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/1149—Arrangements for indoor wireless networking of information

Landscapes

  • Engineering & Computer Science (AREA)
  • Computing Systems (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To make wide-range information transmission possible, by lighting the interior illumination by the power source voltage which is FM-modulated according to information to be transmitted and by receiving this illumination light in the receiving terminal by a light receiving element and subjecting it to FM detection to take out information. CONSTITUTION:Information to be transmitted is applied to FM modulating circuit 5 through signal buffer 4 and is subjected to FM modulation. This modulation signal is applied to reverse converting part 3 to drive the thyristor inverter. The power source voltage is subjected to FM modulation to approximately 400Hz+ or -5% and is taken out from converting part 3. The voltage taken out from converting part 3 is applied to each interior illumination 7 through transformer 6. The light of interior illumination 7 is received by light receiving element 11 and is amplified by AC amplifier 12 and is detected by FM detector 13 and is amplified by amplifier 14.
JP11636579A 1979-09-11 1979-09-11 Indoor information transmission system Pending JPS5640334A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11636579A JPS5640334A (en) 1979-09-11 1979-09-11 Indoor information transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11636579A JPS5640334A (en) 1979-09-11 1979-09-11 Indoor information transmission system

Publications (1)

Publication Number Publication Date
JPS5640334A true JPS5640334A (en) 1981-04-16

Family

ID=14685153

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11636579A Pending JPS5640334A (en) 1979-09-11 1979-09-11 Indoor information transmission system

Country Status (1)

Country Link
JP (1) JPS5640334A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62193328A (en) * 1986-02-19 1987-08-25 Japan Radio Co Ltd Optical communication equipment using ac power source
WO2004038962A1 (en) * 2002-10-24 2004-05-06 Nakagawa Laboratories, Inc. Illumination light communication device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4839483A (en) * 1971-09-22 1973-06-09
JPS4898704A (en) * 1972-03-27 1973-12-14

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4839483A (en) * 1971-09-22 1973-06-09
JPS4898704A (en) * 1972-03-27 1973-12-14

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62193328A (en) * 1986-02-19 1987-08-25 Japan Radio Co Ltd Optical communication equipment using ac power source
WO2004038962A1 (en) * 2002-10-24 2004-05-06 Nakagawa Laboratories, Inc. Illumination light communication device
US7583901B2 (en) 2002-10-24 2009-09-01 Nakagawa Laboratories, Inc. Illuminative light communication device
US7929867B2 (en) 2002-10-24 2011-04-19 Nakagawa Laboratories, Inc. Emergency lamp and wireless emergency lamp data transmission system

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