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Infrared (IR) sensors are used for various purposes, such as human body detection. This study concerns the development of downsized, low-cost lenses for IR sensors, and it is argued that computer generated holograms (CGH) are applicable to a lens. Lenses with CGH are inexpensive and lightweight since they can be mass-produced by using stampers, similar to compact discs. This study shows that lenses with CGH can detect IR with excellent angular resolution with a viewing angle of up to plusmn60deg.