Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Reexamination Certificate
1998-06-25
2001-11-20
Pascal, Leslie (Department: 2633)
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
C359S199200
Reexamination Certificate
active
06320686
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to an optical transmitter and receiver combination arranged concentrically to each other for infrared transceiving through the atmosphere.
BACKGROUND OF THE INVENTION
The invention relates to an optical infrared receiver-transmitter for a directed bi-directional optical data transmission where in a single-part or multi-part housing the following are arranged as components: an emitter chip for transmitting IR beams, a detector chip for receiving IR beams, an integrated circuit for amplifying the transmission and reception power, as well as an optical system complete with an optical axis for focusing the transmitted and received beams.
Such an arrangement, also designated as a transceiver, is used for data transmission in IrDA applications. For data transmission by means of an optical point-to-point transmission route, the IrDA (Infrared Data Association) standard has been developed. For example, integrated transceiver components known by the designation TFDS 3000 or TFDS 6000 are available from TEMIC TELEFUNKEN microelectronic GmbH, which components correspond to the IrDA standard.
According to the state of the art, in a common transceiver housing there are arranged an infrared transmitter (emitter), an infrared receiver (detector), and an integrated circuit for signal processing. A surface of the transceiver component holds two lens-shaped moldings located adjacent to each other, in whose focal points a transmitter and a receiver are respectively located. These optical systems are necessary in order to achieve the directional signal emission of the transmitter and the directional sensitivity of the receiver required by the IrDA standard.
Such transceivers have the disadvantage that due to the transmitter and the receiver being located adjacent to each other, they each require their own respective optical system in order to be able to achieve the required directional signal transmission of the transmitter and the directional sensitivity of the receiver. This causes very high material costs, and the dimensions of the transceiver component will be relatively large.
SUMMARY OF THE INVENTION
The object of the invention is to provide an infrared transceiver having dimensions which are significantly smaller so that material costs and space requirements will be reduced.
According to the invention an optical infrared transceiver for a directed bi-directional optical data transmission combines the following features in a single-part or multi-part housing: an emitter chip for transmitting IR beams, a detector chip for receiving IR beams, a metallization between the chips, an integrated circuit for amplifying the transmission and reception power, an optical lens with an optical axis for focusing the transmitted and received beams, wherein the detector chip and the emitter chip are arranged one on top of the other and on the integrated circuit and concentrically to the optical axis of the optical lens thereby forming a stack.
The advantages of the invention are that it is possible to use a common optical lens for both, transmitter and receiver; this reduces the dimensions of the transceiver very considerably and provides savings in material costs. In addition, shorter bond wires will reduce the interference sensitivity of the component.
Further advantageous applications of the invention are described below.
REFERENCES:
patent: 4721384 (1988-01-01), Dietrich et al.
patent: 5140152 (1992-08-01), Van Zeghbroeck
patent: 5267070 (1993-11-01), Stewart et al.
patent: 5506445 (1996-04-01), Rosenberg
patent: 2629356 (1978-01-01), None
patent: 19508284 (1996-01-01), None
patent: 2011610 (1979-07-01), None
patent: 04237005 (1992-08-01), None
“IrDA-Compatible Data Transmission”, Design Guide Apr. 1996, published by TEMIC semiconductors, pp. 11, 39, 46.
Fasse W. F.
Fasse W. G.
Pascal Leslie
Vishay Semiconductor GmbH
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