Patent ID: 6989894

Claim:
A lens-evaluating apparatus for evaluating a resolution of a lens, comprising a check sheet formed with a resolution-measuring test pattern; a light source for irradiating light on the check sheet to introduce an image light including the test pattern to the lens; a screen to which the image light irradiated by the lens is projected; an image sensor for taking an image of the test pattern displayed on the screen; an image import device for importing the image taken by the image sensor to generate an image signal; and a signal processor including a resolution evaluation value calculator that arithmetically operates the resolution evaluation value based on the image signal outputted by the image import device, wherein the image sensor is provided with a light adjuster for adjusting an amount of light incident on the image sensor, the light adjuster being controlled based on a control signal from the signal processor, and the resolution evaluation value calculator arithmetically operates the resolution evaluation value based on a background luminance value of a part of the check sheet having no test pattern formed thereon, a maximum luminance value and a minimum luminance value in the test pattern image.