Patent ID: 7448549

Claim:
An optical information reader for optically reading a target based on a light reflected from the target, said optical information reader comprising: an imaging lens with an optical axis and a focal length, said reflected light entering into the imaging lens; a photodetector having an active area and located on the optical axis, said imaging lens focusing the reflected light on the active area of the photodetector based on the focal length; and a translucent optical member located on the optical axis and rotatable around a rotation axis substantially orthogonal to the optical axis, said translucent optical member being fixable at least first and second predetermined positions, wherein, when the translucent optical member is fixed at the first predetermined position, the translucent optical member has a first thickness through which the optical axis is penetrated, and when the translucent optical member is temporally fixed at the second predetermined position, the translucent optical member has a second thickness through which the optical axis is penetrated, and wherein said first thickness and second thickness are different from each other.