Patent ID: 9154129
Filing Date: 2015-10-06
Classification: G01B,G01C,H03K

Abstract:
1. A tilt switch comprising: a housing defining a chamber that has a chamber axis and opposite top and bottom ends, and including a frusto-conical inner wall surface that surrounds said chamber axis and that has a cone angle which is less than or equal to 90 degrees, and a tapered bottom inner wall surface that defines said bottom end of said chamber, that tapers downwardly from a bottom end of said frusto-conical inner wall surface and that forms a cone angle which is greater than 90 degrees; a photoelectric module including a light emitter and a light receiver disposed respectively at two opposite sides of said chamber, said light emitter and said light receiver cooperatively defining an optical axis, wherein light emitted from said light emitter travels along said optical axis and passes through said chamber toward said light receiver; and a rolling element that is disposed in said chamber and that is rollable along said tapered bottom inner wall surface and said frusto-conical inner wall surface between a blocking position that blocks the light emitted from said light emitter, and an unblocking position that unblocks the light emitted from said light emitter so that the light can be received by said light receiver; wherein said cone angle of said tapered bottom inner wall surface is less than 180 degrees, and said cone angle of said frusto-conical inner wall surface is between 20 and 90 degrees; and wherein said rolling element in said chamber is not in annular contact with said tapered bottom inner wall surface, and at most contents only one side of said tapered bottom inner wall surface when said tilt switch is in a normal state.