Patent ID: 8128234

Claim:
A position adjustment device for an integration rod, comprising: a fixed plate together with a part of a housing of an optical engine to define an accommodation space for accommodating the integration rod; a first resilient member positioned between the fixed plate and the integration rod for exerting an elastic force on the integration rod in a first direction; a second resilient member positioned between the fixed plate and the integration rod for exerting an elastic force on the integration rod in a second direction different to the first direction; a first adjusting screw inserted through the part of the housing of the optical engine and comprising a first end surface pressing against one side surface of the integration rod opposite the first resilient member; and a second adjusting screw inserted through the part of the housing of the optical engine and comprising a second end surface pressing against one side surface of the integration rod opposite the second resilient member; wherein each of the first end surface and the second end surface is a substantially arc surface to provide point contact between each of the first adjusting screw and the second adjusting screw and the integration rod.