Patent ID: 7267276

Claim:
An apparatus for optically reading a target based on light reflected from the target, said apparatus comprising: an imaging lens with a first optical axis, the reflected light entering into the imaging lens; a photodetector having an active area and a second optical axis, the imaging lens focusing the reflected light on the active area of the photodetector; a first reflector disposed on the first optical axis; a second reflector disposed on the second optical axis, the first and second reflectors being opposite to each other, each of the first and second reflectors folding an optical path of the reflected light between the imaging lens and the photodetector; and an adjusting mechanism configured to adjust a length of the optical path of the reflected light between the imaging lens and the photodetector while keeping each of the first and second optical axes constant by: changing a first reflector angle of the first reflector, a second reflector angle of the second reflector, and an interval between the first and second reflectors along the first optical axis, the first reflector angle representing a sum of an incident angle of the reflected light to the first reflector and a reflection angle thereof from the first reflector, the second reflector angle representing a sum of an incident angle of the reflected light to the second reflector and a reflection angle thereof from the second reflector.