Survey setting point indicating device
A survey setting point indicating device comprises a support member 3 which can be tilted with respect to a vertical direction, a connecting member which can be freely tilted with respect to the support member and hangs vertically downward by gravity, a laser pointer 7 which is provided at a lower end of the connecting member, is concentric with an axis of the connecting member and emits a laser beam vertically downward, and a reflector 5 provided such that the axis of the connecting member passes through a center of the reflector.
1. A survey setting point indicating device comprising a support member which can be tilted with respect to a vertical direction, a connecting member which can be freely tilted with respect to said support member and hangs vertically downward by gravity, a laser pointer which is provided at a lower end of said connecting member, is concentric with an axis of said connecting member and emits a laser beam vertically downward, and a reflector provided such that the axis of said connecting member passes through a center of said reflector.
2. The survey setting point indicating device according to claim 1 , wherein said support member is a rod-like member which can be rotated torsionally with a lower end of said support member as a center, a prism support part extends from said support member in a horizontal direction, and said connecting member is supported by said prism support part.
3. The survey setting point indicating device according to claim 2 , wherein said reflector is an omnidirectional prism which is fixed to said support member and has a space at a center portion, a spherical body is rotatably accommodated in the space, and said connecting member hangs down from said spherical body.
4. The survey setting point indicating device according to claim 3 , wherein at a top portion of said spherical body, a reflection part or a non-reflective part corresponding to a tilting limit of said connecting member is provided, a photosensor is provided so as to face said reflection part or said non-reflective part, and the tilting limit of said connecting member is detected by detecting a boundary of said reflection part or said non-reflective part by said photosensor.
5. The survey setting point indicating device according to claim 3 , wherein a first contact is provided on said connecting member, a second contact is provided on said omnidirectional prism in a portion facing said first contact, and a voltage is applied between said first contact and said second contact, and wherein when said connecting member is tilted and said first contact makes contact with said second contact, the tilting limit of said connecting member is detected.
6. The survey setting point indicating device according to any one of claims 3 to 5 , wherein a hood is provided at a lower end of said omnidirectional prism, and said laser pointer is surrounded with said hood.
7. The survey setting point indicating device according to claim 2 , wherein said connecting member is provided in such manner that said connecting member can be freely tilted with respect to said support member, said reflector is an omnidirectional prism having a space at a center portion, said connecting member passes through the space, and said reflector is fixed to said connecting member.
8. The survey setting point indicating device according to claim 7 , wherein at an upper end of said connecting member, another laser pointer is provided, and a laser beam is emitted upward from said another laser pointer.