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We proposed the laser navigation system navigating a mobile robot with a laser source and considered the effectiveness. As the result of our research, we proved we could navigate the mobile robot by the laser navigation system. However, the optical sensor array decided the operating range and the angle of incident laser. Therefore, we added a pan and tilt mechanism to the optical sensor array and expanded the operating range without the limitation of the angle of incident laser. In this paper, we examine the mobile robot navigation and expansion of its operating range by the optical sensor array with pan and tilt mechanism.