Lighting control device, exposure device, and adjusting method for lighting control device

The invention provides a lighting control device, an exposure device, and an adjusting method for the lighting control device. Discontinuous variation of light intensity of the lighting control device would not occur. The device comprises a laser diode drive circuit with more than 2 terminals used for current output, and current output from different terminals is respectively controlled in different ranges, so as to be used in fin adjustment and coarse adjustment. In the structure, with a view to two target values (D) (imaginary lines in a picture) with the same output current value, an offset target value (Dc) is calculated in a manner that the high-order value of the target value (D) is increased by 1 (that is, be carried) when the target value is increased by one. Thus, output current value is not restrained or discontinuous variation of light intensity would not occur.