| 摘要 |
A security system device using a laser is provided to increase a light receiving region of a receiving sensor by forming a focusing lens and a focusing film at a receiving portion of the receiving sensor. A security system device includes a light emitting unit and a receiving unit having a receiving sensor. A fixing hole is formed at a front center of a main body of the receiving unit. A holding bump is formed on an inner periphery of the fixing hole, such that a case(230) is coupled with a front surface of a PCB(Printed Circuit Board)(210). A focusing lens(240) includes a circular body. Holding protrusions are formed on an outer periphery of the body. The focusing lens is coupled with the fixing hole of the case, such that a center of the receiving sensor is aligned on the same line as a center of the body. A fixing packing(250) has a through-hole formed at a center of a circular body. An insertion protrusion is formed to be elongated from a rear portion of the outer periphery of the body, which supports a front surface of the holding protrusion. The insertion protrusion is formed between the inner periphery of the fixing hole and an outer periphery of the holding protrusion of the focusing lens, such that the focusing lens is fixed in the fixing hole of the case. |
