KR920020146U - 독서시 시력 보호용 회로 - Google Patents

독서시 시력 보호용 회로

Info

Publication number
KR920020146U
KR920020146U KR2019910004336U KR910004336U KR920020146U KR 920020146 U KR920020146 U KR 920020146U KR 2019910004336 U KR2019910004336 U KR 2019910004336U KR 910004336 U KR910004336 U KR 910004336U KR 920020146 U KR920020146 U KR 920020146U
Authority
KR
South Korea
Prior art keywords
reading
circuit
protecting eyesight
eyesight
protecting
Prior art date
Application number
KR2019910004336U
Other languages
English (en)
Other versions
KR940004422Y1 (ko
Inventor
홍정자
백봉석
Original Assignee
홍정자
백봉석
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 홍정자, 백봉석 filed Critical 홍정자
Priority to KR2019910004336U priority Critical patent/KR940004422Y1/ko
Publication of KR920020146U publication Critical patent/KR920020146U/ko
Application granted granted Critical
Publication of KR940004422Y1 publication Critical patent/KR940004422Y1/ko

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18—Status alarms
    • G08B21/182—Level alarms, e.g. alarms responsive to variables exceeding a threshold
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/70—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using electromagnetic waves other than radio waves
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B7/00—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
    • G08B7/06—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
KR2019910004336U 1991-04-01 1991-04-01 독서시 시력 보호용 회로 KR940004422Y1 (ko)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019910004336U KR940004422Y1 (ko) 1991-04-01 1991-04-01 독서시 시력 보호용 회로

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR2019910004336U KR940004422Y1 (ko) 1991-04-01 1991-04-01 독서시 시력 보호용 회로

Publications (2)

Publication Number Publication Date
KR920020146U true KR920020146U (ko) 1992-11-17
KR940004422Y1 KR940004422Y1 (ko) 1994-06-30

Family

ID=19312233

Family Applications (1)

Application Number Title Priority Date Filing Date
KR2019910004336U KR940004422Y1 (ko) 1991-04-01 1991-04-01 독서시 시력 보호용 회로

Country Status (1)

Country Link
KR (1) KR940004422Y1 (ko)

Also Published As

Publication number Publication date
KR940004422Y1 (ko) 1994-06-30

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Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
NORF Unpaid initial registration fee