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Title:
テレビカメラ用LED照明装置
Document Type and Number:
Japanese Patent JP4320245
Kind Code:
B2
Abstract:

To provide an LED illuminator for television camera capable of reducing the circuit and simplifying the configuration system.

The illuminator 1 comprises a plurality of LED groups 3a, 3b-3h being driven through drive circuits 2a, 2b ... 2h provided for respective groups to emit light in units of group, an oscillation circuit 4 outputting a clock pulse at a predetermined frequency, a counter circuit 5 outputting a plurality of address signals sequentially to circulate periodically upon receiving the clock pulse, a decoder circuit 6 provided with a decoder outputting sequential selection signals upon receiving each address signal, a pulse modulation circuit 7 outputting a pulse modulation signal synchronized with the clock pulse, gate circuits 8a, 8b ... 8h outputting control signals performing drive control of the drive circuits 2a, 2b ... 2h with the pulse width of the pulse modulation signal upon receiving the pulse modulation signal and the sequential selection signal in AND state, and a power supply circuit 9 for each LED group and each circuit.

COPYRIGHT: (C)2005,JPO&NCIPI


Inventors:
Yuji Kamata
Yoshitaka Ohara
Application Number:
JP2003400607A
Publication Date:
August 26, 2009
Filing Date:
November 28, 2003
Export Citation:
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Assignee:
Mikami Co., Ltd.
International Classes:
G03B15/02; H04N5/238; H05B37/02
Domestic Patent References:
JP2001215579A
JP2003243713A
JP9282442A
Attorney, Agent or Firm:
Taichi Chiba



 
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