Abstract An apparatus for detecting motion of an object or person movable in a field of view has a cylindrical reflecting type lens, oriented with its concentric axis in a vertical direction or at right angles to the direction of motion of the object in the field of view. It includes a photosensitive cell oriented in a direction transverse to the principal axis of the lens and positioned at a point on the principal axis less than the focal length of the lens from the lens surface. The lens produces images in the shape of bands for stationary objects in the field of view, the narrow bands extending parallel to the concentric axis of the cylindrical surface. When an object or person enters the field of view at least two images, movable in character, and in the form of narrow bands are produced on the photosensitive cell and these two movable images traverse the surface of the photosensitive cell in opposite directions with respect to each other, coinciding at a point where the principal axis of the lens intersects the photosensitive cell. When the movable bands traverse the stationary bands on the photosensitive cell, they produce a modulation of the light impinging on the photosensitive cell, which is converted to voltage pulses by the photosensitive cell. The apparatus further includes a frequency discriminator and amplitude discriminator for segregating the pulses produced by the photosensitive cell on the basis of frequency and amplitude, a normalizer for converting the pulses of varying energy content to pulses of uniform energy content, a voltage accumulator for building up a voltage in response to the reception of a given number of pulses in a given interval of time and a switch controlled alarm responsive to a predetermined voltage level for sounding an alarm or for giving an indication that the field of view has been penetrated by a movable object.
An intrusion detecting apparatus responsive to motion in a predetermined area comprising: a cylindrical concave reflecting type lens means directed towards said predetermined area for producing a duality of band-shaped images of each stationary object within said area and a duality of images of each movable object in said area, which images are movable at different speeds and in opposite directions with respect to each other and into and out of coincidence with each other and the images of said stationary objects as the movable objects traverse said area; photosensitive means for receiving said images of objects in said area and responsive to the changing conditions caused by the images moving into and out of coincidence with each other and with said stationary images to produce a signal voltage having a series of voltage pulses; means for amplifying said voltage pulses and generating a series of pulses of uniform amplitude and duration in response to said amplified voltage pulses; means for storing said uniform voltage pulses and for generating a voltage whose level represents the frequency of said uniform pulses; and means responsive to a predetermined level of voltage in said means for storing said uniform pulses for sounding an alarm.
Claim 2
Dependent Claim
201 words
An intrusion detecting apparatus responsive to motion in a predetermined area comprising: a cylindrical concave reflecting type lens means directed towards said predetermined area for producing a duality of band-shaped images of each stationary object within said area and a duality of images of each movable object in said area, which images are movable at different speeds and in opposite directions with respect to each other and into and out of coincidence with each other and the images of said stationary objects as the movable objects traverse said area; photosensitive means for receiving said images of objects in said area and responsive to the changing conditions caused by the images moving into and out of coincidence with each other and with said stationary images to produce a signal voltage having a series of voltage pulses; means for amplifying said voltage pulses and generating a series of pulses of uniform amplitude and duration in response to said amplified voltage pulses; means for storing said uniform voltage pulses and for generating a voltage whose level represents the frequency of said uniform pulses; and means responsive to a predetermined level of voltage in said means for storing said uniform pulses for sounding an alarm.
Claim 3
Dependent Claim
101 words
The apparatus as set forth in claim 1, wherein; said photosensitive means comprises a plurality of cells arranged approximately in a focal surface of said lens means extending the sensitive surface of said photosensitive means in a direction in which the movable images will move, whereby to increase the number of coincidences of the movable images that will be sensed, and means responsive to the amplitude of said voltage pulses to elimiinate low amplitude pulses and to restrict the response of said apparatus to voltage pulses having amplitudes comparable to those produced as a result of coincidence of said movable images.
Claim 4
Dependent Claim
56 words
The apparatus as set forth in claim 1 wherein; said cylindrical concave reflective type lens has a reflecting surface extending through two hundred and seventy degrees and wherein said photosensitive means comprises two cells arranged at an angle to each other and in a side by side relation along the path of motion of said images.
Claim 5
Dependent Claim
50 words
The apparatus as set forth in claim 1 wherein said cylindrical concave reflecting type lens has a reflecting surface extending over one hundred and eighty degrees and wherein said photosensitive means comprises of a single cell oriented at right angles to and astraddle the principal axis of said lens means.
Claim 6
Dependent Claim
46 words
Apparatus as set forth in claim 1 further including means for selectively adjusting the position of said photosensitive means along the principal axis of said lens, whereby said apparatus may be adjusted to suit conditions produced by the environment in which the apparatus will find utilization.