Telecommunications – Transmitter and receiver at same station – Having particular housing or support of a transceiver
Reexamination Certificate
1998-12-18
2001-08-28
Legree, Tracy (Department: 2681)
Telecommunications
Transmitter and receiver at same station
Having particular housing or support of a transceiver
C455S575100, C379S433020, C702S107000, C439S105000
Reexamination Certificate
active
06282409
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a lid of a portable electric device, said lid also comprising electric circuitry. In particular the invention relates to the lid itself as well as a portable device comprising the lid as well as a method of manufacturing the lid.
DESCRIPTION OF RELATED ART
The technical evolution, in terms of features such as weight and size, in the field of portable mobile telephone terminals has reached a point where physiognomic considerations must be made. Limitations in terms of size of previous generations of mobile terminals were dictated by the size of the components of the terminal, not least the size of the battery pack. Present day terminals, on the other hand, comprise a small number of highly integrated low-power circuits that easily fit inside a palm-sized unit. In fact the dimensions of the smaller among the recently developed terminals are such that the distance between the loudspeaker and the microphone has become an important design factor. In order to further miniaturize the terminals, while still enabling a proper alignment between the loudspeaker/microphone and the ear/mouth of the user, mechanical solutions such as foldable lids and arms comprising a microphone or a speaker have become commonplace.
A problem relating to the foldable and flip-lid equipped terminals is obviously their sensitivity to mechanical abuse. Both in terms of normal every day wear as well as occasional abuse due to carelessness on the side of the user. This problem has led to a requirement of replaceable lids of the terminals. A typical example of the state of the art in this respect is disclosed in the international patent application having publication number WO 96/21988. A portable radio with a detachable flip portion comprises a housing and a flip, each having electrical circuitry. The flip is rotatively mounted to the housing and the flip can be detached and reattached. Electrical coupling means on both flip and housing, that are freely separable from one another, allow electrical attachment and reattachment of the flip.
The arrangement disclosed in WO 96/21988 does not allow a user to replace a lid of the portable radio with any other lid while at the same time retaining electrical matching between the circuits of the lid and the radio.
SUMMARY OF THE INVENTION
In view of prior art as discussed above, a number of problems remain to be solved regarding attachable and detachable lids at portable electrical devices. Hence, a first problem solved by the present invention is how to provide a lid comprising electrical circuitry which is capable of being attached and detached to a portable electrical device while retaining an electrical match between the circuits of the lid and the device.
Another problem solved by the present invention is how to provide a portable electrical device with a replaceable lid containing electrical circuitry while retaining an electrical match between the circuits of the lid and the device.
Yet another problem solved by the present invention is how to provide a method of manufacturing a lid containing electrical circuitry which is electrically matched with respect to circuitry of a device to which the lid is to be attached.
The object of the present invention is to overcome the problems as stated above. This is achieved by providing a lid equipped with electrical circuitry, a portable electrical device comprising such a lid as well as a method of manufacturing the lid at a portable electrical device.
In short, the objects of the present invention is achieved by providing the lid containing electrical circuitry with an electrical calibration circuit capable of being calibrated to a predetermined calibration value suitable for enabling electrical connection to the portable electrical device. Further, a method of manufacturing the lid entails assembling the lid with its electrical circuitry and calibrating the circuitry to a predetermined calibration level.
In some more detail, it is shown a lid at a portable device, as well as a portable device having a lid, where said portable device contains electrical device circuitry within a device housing. The lid comprises electrical lid circuitry, mechanical lid connection means for enabling mechanical connection and disconnection to mechanical device connection means of the device that are accessible from without the housing. The lid further comprises electrical lid connection means for enabling electrical connection and disconnection to electrical device connection means of the device that are accessible from without the housing. The electrical lid circuitry comprises electrical calibration means that enable calibration of the electrical lid circuitry to a predetermined calibration value as sensed at the electrical lid connection means.
It is also shown a method of manufacturing such a lid at a portable device where the method comprises the steps of assembling the electrical lid circuitry to a lid base plate, and calibrating the electrical lid circuitry to a predetermined calibration value as sensed at the electrical lid connection means.
An advantage of the present invention is that a lid comprising electrical circuitry which is capable of being calibrated to a predetermined calibration value may be supplied as a replacement part to any portable device, without need for individual electrical calibration at the time of attachment to the device.
Another advantage of the present invention is that a manufacturer of lids may be alleviated of the responsibility of ensuring that the lid circuitry is correctly calibrated by the fact that the lid circuitry is calibrated in a separate step in the method of manufacturing the lid.
REFERENCES:
patent: 5473685 (1995-12-01), Mulder
patent: 5537472 (1996-07-01), Estevez-Alcolado et al.
patent: 5572223 (1996-11-01), Phillips et al.
patent: 5673314 (1997-09-01), Olkoski et al.
patent: 6091938 (2000-07-01), Go
patent: 6178388 (2001-01-01), Claxton
patent: WO96/21988 (1996-07-01), None
Landström. R., International-Type Search Report, Sep. 14, 1998, Search Request No. SE97/01562, pp. 1-3.
Jenkens & Gilchrist
Legree Tracy
Telefonaktiebolaget LM Ericsson
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