Patent ID: 8477568

Claim:
An alarm clock which operates in conjunction with a gradually fading-in lamp, comprising: a power supply unit; a key input setting unit ( 110 ) comprising a lamp activation time setting unit ( 111 ) for setting an activation time of a lamp ( 140 ) and an alarm activation time setting unit ( 112 ) for setting an activation time of an alarm module ( 160 ); the lamp ( 140 ) for emitting light using power supplied by a power supply unit; a microcomputer ( 120 ) configured to be provided with a timer having a clock function, which is stored in a form of a program, to output a lamp drive control signal and a pulse width signal at the lamp activation time set by the lamp activation time setting unit ( 111 ), to output an alarm control signal at the activation time of the alarm module ( 160 ) set by the alarm activation time setting unit ( 112 ), and to output a time display signal to the time display unit ( 170 ); the time display unit ( 170 ) for receiving the time display signal output by the microcomputer ( 120 ), and then displaying current time; the alarm module ( 160 ) configured to be selectively turned on and off in response to the alarm control signal output by the microcomputer ( 120 ), and to output a sound alarm signal; a lamp power supply control unit ( 130 ) connected between the power supply unit and the lamp ( 140 ), and configured to be selectively switched on and off in response to the lamp drive control signal output by the microcomputer ( 120 ) and to control the power supplied by the power supply unit to the lamp ( 140 ); and a lamp current adjustment unit ( 150 ) connected in series to the lamp ( 140 ), and configured to perform control so that an amount of current flowing through the lamp ( 140 ) gradually increases based on the pulse width signal output by the microcomputer ( 120 ), thereby making the lamp ( 140 ) gradually fade in, wherein the pulse width signal, which is output to the lamp current adjustment unit ( 150 ) by the microcomputer ( 120 ) so that the lamp current adjustment unit ( 160 ) can perform control so that the amount of current flowing through the lamp ( 140 ) gradually increases, is characterized in that a width of a logic high pulse that turns on the lamp ( 140 ) gradually increases over time.