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| Scale for use with opto-electronic scale reading apparatus |
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| Acoustic wave devices |
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| Staggered SAW resonator for differential detection |
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| Beam former having variable delays between LED output signals |
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| Crystal oscillators using negative voltage gain, single pole response amplifiers |
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Device for optical interconnection of electronic component cards within a case and a method of fabrication of said device
| Details |
Inventors: D'Auria, Luigi; Huignard, Jean P.; Puech, Claude; Herriau, Jean P.;
Assignee: Thomson-CSF (Paris, FR)
Primary Examiner: Westin; Edward P.
Assistant Examiner:
Attorney, Agent or Firm: Oblon, Fisher, Spivak, McClelland, & Maier
A device for establishing optical connection links between electronic component cards forming part of a package. The device comprises a transparent plate having parallel faces and a light source which emits a divergent beam and is implanted on a first card. The beam is reflected from a first optical diffracting element in the form of a collimated beam which undergoes multiple reflections from alternate reflecting elements to a second optical diffracting element and is converted by the second element to a convergent beam transmitted to a detector which is implanted on a second card. |
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DETAILED DESCRIPTION The aim of this invention is to overcome the disadvantages of the prior art by providing an optical interconnection device for establishing multiple communication channels between any two cards or any number of cards of a given package while avoiding the bulk and complexity of optical-fiber connections.
The invention is therefore directed to an optical interconnection device for a package containing electronic component cards placed in side-by-side relation.
The device serves to establish at least one optical link between a first card among a plurality of cards of the package and a second card, a light source being implanted on said first card for emitting a divergent beam of light energy in a first mean direction of propagation, a detector which is sensitive to said light energy being implanted on said second card.
The device comprises a plate having parallel faces and placed opposite to the light source, said plate being formed of material which is transparent to the light produced by said source.
At least the following optical elements are placed on the faces of said plate: a first optical element having a diffracting structure and placed on a first face of the plate opposite to the light source for receiving the divergent beam and reflecting said beam in the form of at least one collimated beam having a direction of propagation which forms a predetermined angle with the faces of the plate, reflecting elements arranged alternately on the two faces of the plate for receiving and reflecting the collimated beam, and a second optical element having a diffracting structure and placed on the first face of the plate for receiving the collimated beam after successive reflections within the plate from alternate reflecting elements and for reflecting said collimated beam in the form of a convergent beam in a second mean direction of propagation, said beam being received by said light detector which is implanted on the second card, thereby forming a continuous optical path between said first and second cards of the package
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