Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Reexamination Certificate
1998-06-25
2001-10-09
Negash, Kinfe-Michael (Department: 2633)
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
Reexamination Certificate
active
06301035
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to an infrared transceiver for a directed bi-directional optical data transmission through the atmosphere. The transceiver is mounted in a single-part or multi-part housing and includes the following components: an emitter chip for transmitting IR beams, a detector chip for receiving IR beams, and an optical system having an optical axis for focusing the transmitted and received beams.
BACKGROUND INFORMATION
Such a transceiver is used for data transmissions 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.
Conventionally there are arranged in a common transceiver housing an infrared transmitter (emitter), an infrared receiver (detector), and an integrated circuit for signal processing. A surface of the transceiver component carries two lens-shaped moldings located adjacent to each other, in whose focal points the transmitter and the receiver are respectively located. These optical lens-shaped moldings are necessary in order to achieve the directional signal emission of the transmitter and the directional sensitivity of the receiver as required by the IrDA standard.
Conventional 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 duplication causes high material costs and the dimensions of the transceiver are relatively large.
If the integrated circuit, the receiver, and the transmitter are arranged in a stack, that is, the receiver on the integrated circuit and the transmitter on the receiver, there is a disadvantage in that a part of the receiver element is covered by the transmitter element, thus reducing the receiver sensitivity. Furthermore, due to the way circuit, receiver, and transmitter are arranged, it is not possible—as, for example is possible with light-emitting diodes (LED)—to arrange the transmitter within a cup-shaped reflector; which, due to the undirected radiation, will cause a reduction in transmission power.
SUMMARY OF THE INVENTION
The object of the invention is to provide a component which in spite of smaller dimensions provides a high receiver sensitivity and a high transmission power.
According to the invention there is provided an infrared transceiver for a directed bi-directional optical data transmission through the atmosphere characterized in that in a single-part or multi-part housing are arranged in a stack an integrated circuit: an emitter chip for transmitting IR beams, a detector chip for receiving IR beams, and a lens system having an optical axis for focusing the transmitted and received beams, and in that a reflector is arranged concentrically to the optical axis and relative to the stack including the lens system, so that the transmission power and the reception sensitivity of the transceiver are increased.
The advantages of the invention are that it is possible to use a common optical lens system and reflector for both the transmitter and the receiver, whereby the dimensions of the transceiver are considerably reduced and savings in material costs are achieved. Due to the reflector, the transmission power and the sensitivity of the transceiver are increased by also detecting IR beams coming in from the side and fed to the receiver, and by also radiating outgoing IR beams being emitted by the transmitter, which go past the optical lens system, to the side thereof without necessarily passing through the lens system.
REFERENCES:
patent: 3979587 (1976-09-01), de Cremoux
patent: 4279465 (1981-07-01), Vojvodich
patent: 5122893 (1992-06-01), Tolbert
patent: 5617152 (1997-04-01), Stolov
patent: 6157476 (2000-12-01), Angerstein et al.
patent: 2523681 (1975-12-01), None
patent: 0471565 (1992-02-01), None
patent: 1466486 (1977-03-01), None
patent: 60-28279 (1985-02-01), None
Fasse W. F.
Fasse W. G.
Negash Kinfe-Michael
Vishay Semiconductor GmbH
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