Light transceiver device
First Claim
1. An improved light transceiver for transmitting and receiving a light beam along a predetermined light path, said transceiver comprising:
- a frame having spaced apart side members,one of said side members including an enclosure and having an opening aligned with said path but otherwise being light tight,a light source for emitting a light beam and being located within said enclosure,an aperture in said enclosure to permit passage of light from said source toward said other side member,light receiver means secured within said enclosure including an active element to receive said light, said element being offset from said opening,light directing mirror means on said other side member for receiving the light beam from said source and directing it along said path into said opening in the enclosure, andlight reflecting means secured within said enclosure offset from said element and aligned with said opening, said light path and said element for directing light passing trough said opening from said source to said active element, said reflecting means directing substantially all light received at an angle from said path to positions around and away from said receiver active element.
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Accused Products
Abstract
An improved light transceiver device for use in alarm or counting systems. The transceiver is housed in a light tight housing and includes an adjustable mirror offset from the active element of the transceiver. The mirror directs light through an aperture in the housing along a predetermined axis from the active element and directs light to the active element which is received through the aperture along the axis. The mirror deflects any light received through the aperture which is received at an angle greater than a predetermined angle from the axis around the active element of the transceiver to block ambient light interference. The transceiver also may be utilized in an improved light screen or barrier which may be utilized either for an alarm system such as in a jewelry case or in a counting system wherein objects are passed through the light screen in the frame to be counted.
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Citations
9 Claims
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1. An improved light transceiver for transmitting and receiving a light beam along a predetermined light path, said transceiver comprising:
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a frame having spaced apart side members, one of said side members including an enclosure and having an opening aligned with said path but otherwise being light tight, a light source for emitting a light beam and being located within said enclosure, an aperture in said enclosure to permit passage of light from said source toward said other side member, light receiver means secured within said enclosure including an active element to receive said light, said element being offset from said opening, light directing mirror means on said other side member for receiving the light beam from said source and directing it along said path into said opening in the enclosure, and light reflecting means secured within said enclosure offset from said element and aligned with said opening, said light path and said element for directing light passing trough said opening from said source to said active element, said reflecting means directing substantially all light received at an angle from said path to positions around and away from said receiver active element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification