| 摘要 |
A circuit for an illuminator includes LEDs (DL1, . . . , DL6) which are connected to resistors (R1, . . . , R6) respectively in series to provide six series units and twos of these series units therein are connected in parallel and moreover threes of these parallel units are connected in series in a lattice arrangement. Even when DL2 undergoes disconnection, for example, an increased amount of current flowing in DL1 can thus be restrained as much as possible and even when LEDs with variable forward voltage are connected in parallel, a difference in the flowing amount of current between the LEDs is minimized and a difference in brightness is substantially nullified. Moreover, as resistors are added to the respective units, the number of LEDs can freely be changed by directly connecting units with the omission of the LED.
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