Patent ID: 8835850
Filing Date: 2014-09-16
Classification: G01J,G01V

Abstract:
1. A human body sensing device being mounted on an object, the human body sensing device comprising: a first and second pyroelectric sensor being mounted on a vertical plane of the object and each having a pair of a positive and negative electrode; a lens covering over the first and second pyroelectric sensors, wherein the lens is composed of a fly-eye lens containing a plurality of element lenses to form a plurality of sensing blocks in a sensing area; a calculator configured to adjust output from the first and second pyroelectric sensors to obtain an absolute value of the same when a human body moves toward the object having the human body sensing device; and an identification portion configured to identify a direction in which a human body is moving based on results obtained by the calculator from each of the plurality of sensing blocks, wherein: the lens forms the plurality of sensing blocks in a sensing area constituting a plane perpendicular to the vertical plane of the object, each sensing block including a first positive and negative field corresponding to the positive and negative electrodes of the first pyroelectric sensor, and a second positive and negative field corresponding to the positive and negative electrodes of the second pyroelectric sensor, the plurality of sensing blocks arranged in an approaching/separating direction perpendicular to the vertical plane of the object; each sensing block arranged such that either a first virtual line connecting the first positive and negative fields or an extended part thereof and either a second virtual line connecting the second positive and negative fields or an extended part thereof have a point of intersection in the sensing area; the first and second virtual lines are symmetric with respect to an axis corresponding to a line perpendicular to the vertical plane of the object and passing through the point of intersection; and the identification portion recognizes that a human body is moving toward the object having the human body sensing device when maximum values of the results obtained by the calculator from each of the plurality of sensing blocks indicate an increase.