Patent ID: 7016053

Claim:
A lighting system for an image processing type of measuring device having an optical system for lighting including a luminescent light source and irradiating light from this optical system for lighting to an object to be measured to measure such parameters as the size or form of the measured object from an obtained image of the measured object, said lighting system comprising: a storage unit with data concerning relations between the luminous intensity obtained with said optical system for lighting and the currents flown to said luminescent light source stored therein; and a control unit for controlling a current flown to said luminescent light source based on the data concerning relations between the luminous intensity and the current stored in the storage unit so that the luminous intensity obtained with the optical system for lighting satisfies a preset values, wherein the luminescent light source for said optical system for lighting comprises LEDs, and said storage unit stores therein data concerning a plurality of relations between the luminous intensity obtained with said optical system for lighting and the impressed currents then flown to said LEDs as references for different luminous intensities.