Photoelectric detector having an indicator for indicating the operating condition thereof
AssigneeOmron Tateisi Electronics Co.
InventorsToshifumi Fukuyama, Yasunori Asakura, Norio Onji
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Abstract
A photoelectric detector for detecting the presence of an object which comprises at least a light ray projecting element, for example, of a luminescent diode and a light ray receiving photoelectric element, for example, of a photo transistor. The two elements are respectively received in bores formed in a housing in such a manner that only the light rays emitted by the projecting elements is received by the receiving element with any lights due to irregular reflection prevented from reaching the receiving element so as to avoid erroneous functioning of the detector.
Claims15
A photoelectric detector having an indicator for indicating the operating condition thereof which comprises a housing, and at least a light ray projecting element and a light ray receiving element received in corresponding bores formed in said housing with front surfaces of said projecting element and said receiving element spaced away from a light ray receiving front surface of said housing by a predetermined distance so that each of said bores forms a passage of light rays between said light ray receiving front surface of said housing and each of said front surfaces of said projecting element and said receiving element, said bores for receiving said light ray projecting and receiving elements being in parallel to one another and said distance between said front surface of said housing and each front surface of said elements being determined in such an extent that an optimum angle of directivity of said detector can be obtained with any light rays due to irregular reflection prevented from reaching said light ray receiving element, and with only light rays emitted by said light ray projecting element and reflected by an object to be detected reaching said light ray receiving element, and said photoelectric detector being further provided with a third bore in parallel to and in spaced relation to said bores for said projecting element and said receiving element, said third bore receiving therein a luminescent element for indicating the operating condition of said photoelectric detector at a position visible at the front surface of said housing.
A photoelectric detector having an indicator for indicating the operating condition thereof comprising a housing, at least a first light ray projecting element and a first light ray receiving element received in corresonding parallel extending bores formed in said housing, said first projecting element and said first receiving element having the front surfaces thereof spaced fron a light ray receiving front surface of said housing by a predetermined distance so that each of said bores forms a passage of light rays beteeen said light receiving front surface of said housing and each of said front surfaces of said first projecting element and said first receiving element, the distance between said front surface of said housing and each front surface of said elements being determined such that an optimum angle of directivity of said detector can be obtained with any light rays and irregular reflection being prevented from reaching said first light ray receiving element and with only light rays emitted by said light ray projecting element and reflected by an object to be detected reaching said first light ray receiving element, a first luminescent element for indicating the operating condition of said first light ray receiving element and positioned within a third bore formed in said housing in parallel to and in spaced relation to said bores for said projecting and receiving elements, said luminescent element being visible at said front surface of said housing, and filter means being provided at said light ray receiving front surface of said housing for covering at least said first projecting element and said first receiving element, said filter means serving for passing light rays emitted by said first projecting element and cutting off light rays due to irregular reflection so as to prevent said photoelectric detector from functioning erroneously.
Dependencies are inferred from the claim text.