U.S. patent application number 10/502081 was filed with the patent office on 2005-04-28 for functional cover for use with a wireless terminal.
Invention is credited to Nielsen, Peter Dam.
Application Number | 20050090280 10/502081 |
Document ID | / |
Family ID | 27787471 |
Filed Date | 2005-04-28 |
United States Patent
Application |
20050090280 |
Kind Code |
A1 |
Nielsen, Peter Dam |
April 28, 2005 |
Functional cover for use with a wireless terminal
Abstract
A wireless communication terminal has a user exchangeable cover
part. The wireless communication terminal and user exchangeable
cover part are electrically interconnected by means of an
electrical connector. The user exchangeable cover part comprises
identification means. The user exchangeable cover part has an
electric circuitry for supporting a user interface of the wireless
terminal. The wireless terminal identifies the user exchangeable
cover part by detecting the identification means. The wireless
terminal operates the electric circuitry of the user exchangeable
cover part independently of the identification of user exchangeable
cover part.
Inventors: |
Nielsen, Peter Dam; (Lyngby,
DK) |
Correspondence
Address: |
PERMAN & GREEN
425 POST ROAD
FAIRFIELD
CT
06824
US
|
Family ID: |
27787471 |
Appl. No.: |
10/502081 |
Filed: |
December 14, 2004 |
PCT Filed: |
February 12, 2003 |
PCT NO: |
PCT/IB03/00451 |
Current U.S.
Class: |
455/550.1 ;
455/575.8 |
Current CPC
Class: |
H04M 1/7246
20210101 |
Class at
Publication: |
455/550.1 ;
455/575.8 |
International
Class: |
H04M 001/00 |
Claims
What is claimed is:
1. A method of operating an electric circuitry included in an
exchangeable cover part for supporting a user interface of a
wireless terminal, said wireless communication terminal and said
user exchangeable cover part are electrically interconnected by
means of an electrical connector having a plurality of pins, said
method comprises: identifying the type of said user exchangeable
cover part; operating at least one of said connector pins in an
identification means; and afterwards in an operation state for
operating the electric circuitry of said user exchangeable cover
part; and mapping to one or more keys connected to said electric
circuitry of said user exchangeable cover a set of tones and/or
sound effects.
2. A method according to claim 1, wherein said value is a resistor
value included in the identification means.
3. A method according to claim 2, wherein operation state is a
frequency mode for directing an electrical representation of a
ringing signal to the electric circuitry for providing an
illumination effect following the ringing signal.
4. A wireless communication terminal having a user exchangeable
cover part, wherein the wireless communication terminal and user
exchangeable cover part are electronically interconnected by means
of an electrical connector; said user exchangeable cover part
comprises identification means; said user exchangeable cover part
including an electric circuitry for supporting a user interface of
said wireless terminal; said connector includes a plurality of
connector pins, where at least one of said connector pins is
adapted to allow said wireless terminal to operate said user
exchangeable cover in an identification state for sensing a value
included in the identification means, and afterwards in an
operation state for operating the electric circuitry of said user
exchangeable cover part; and said user exchangeable cover part
comprises one or more keys connected to said electric circuitry of
said user exchangeable cover and adapted to map to a set of tones
and/or sound effects.
5. A wireless communication terminal according to claim 4, wherein
said connector pins are arranged in line in an equal distance.
6. A wireless communication terminal according to claim 5, wherein
the connector pins are arranged at the rear side of the cover
part.
7. A wireless communication terminal according to claim 6, wherein
the number of connector pins is three.
8. A wireless communication terminal according to claim 6, wherein
the number of connector pins is five.
9. A wireless communication terminal according to claim 5, wherein
said value is a resistor value included in the identification
means.
10. A wireless communication terminal according to claim 6, wherein
the operation state is a frequency mode for directing an electrical
representation of a ringing signal to the electric circuitry for
providing an illumination effect synchronised with the ringing
signal.
11. A wireless communication terminal according to claim 4, wherein
said set of tones and/or sound effects comprise music instrument
digital interface tones.
12. A wireless communication terminal according to claim 4, wherein
said keys are adapted for sound creating purposes comprising music
composing applications, sound creating applications, gaming, ring
tone creation, system sound creation, sending sounds with
multimedia messaging service or other messaging service, or any
combination thereof.
13. A user exchangeable cover for releasable attachment to a
wireless communication terminal, wherein the user exchangeable
cover part and wireless communication terminal in attached position
are electrically interconnected by means of an electrical
connector, wherein said user exchangeable cover comprises
identification means; said user exchangeable cover includes an
electric circuitry for supporting a user interface of said wireless
terminal; and said user exchangeable cover part comprises one or
more keys connected to said electric circuitry of said user
exchangeable cover and adapted to map to a set of tones and/or
sound effects; and said connector includes a plurality of connector
pins, where at least one of said connector pins is adapted to allow
said wireless terminal to operate said user exchangeable cover in
an identification state for sensing a value included in the
identification means, and afterwards in an operation state for
operating the electric circuitry of said user exchangeable cover
part.
14. A user exchangeable cover part according to claim 13, wherein
said set of tones and/or sound effects comprise music instrument
digital interface tones.
15. A user exchangeable cover part according to claim 13, wherein
said keys are adapted for sound creating purposes comprising music
composing applications, sound creating applications, gaming, ring
tone creation, system sound creation, sending sounds with
multimedia messaging service or other messaging service, or any
combination thereof.
Description
BACKGROUND OF THE INVENTION
[0001] The invention relates to a functional cover for use with a
wireless terminal, such as a cellular phone. Such covers include
functionality that is implemented by adding electronics to the
cover. The invention furthermore relates to the mechanical and the
electrical interface between a functional cover and a wireless
terminal.
SUMMARY OF THE INVENTION
[0002] According to a first aspect of the invention a method is
provided for operating an electric circuitry included in an
exchangeable cover part for supporting a user interface of said
wireless terminal. The wireless communication terminal and said
user exchangeable cover part are electrically interconnected by
means of an electrical connector having connector pins, and the
method includes identification of the type of said user
exchangeable cover part, and operating at least one of the
connector pins in an identification state for sensing a value
included in the identification means, and afterwards in an
operation state for operating the electric circuitry of the user
exchangeable cover part. Hereby the wireless terminal is able to
identify the type of the cover in a booting routine and afterwards
to operate the cover according to this. The cover may have special
illumination effect, special game keys, special sound keys, special
memories for playing music or playing games.
[0003] Preferably the connector has a plurality of pins, and at
least one of said connector pins is operated in an identification
state for sensing a resistor value included in the identification
means, and afterwards in an operation state for operating the
electric circuitry of said user exchangeable cover part.
[0004] According to a preferred embodiment of the invention, the
operation state is a frequency mode for directing an electrical
representation of a ringing signal to the electric circuitry for
providing an illumination effect following the ringing signal.
[0005] According to a further aspect, the invention relates to a
wireless communication terminal having a user exchangeable cover
part, wherein the wireless communication terminal and the user
exchangeable cover part are electrically interconnected by means of
an electrical connector. The user exchangeable cover part comprises
identification means, and an electric circuitry for supporting a
user interface of the wireless terminal. The wireless terminal
identifies the user exchangeable cover part by detecting the
identification means; and the connector includes a plurality of
connector pins, where at least one of the connector pins is
operated in an identification state for sensing a value included in
the identification means, and afterwards in an operation state for
operating the electric circuitry of the user exchangeable cover
part.
[0006] Preferably, the connector includes a plurality of connector
pins arranged in line in an equal distance. Advantageously, the
connector pins are arranged at the rear side of the cover part.
According to a preferred embodiment of the invention the number of
connector pins is three. According to a further embodiment of the
invention the number of connector pins is five.
[0007] Preferably, at least one of said connector pins is operated
in an identification state for sensing a resistor value included in
the identification means, and afterwards in an operation state for
operating the electric circuitry of said user exchangeable cover
part.
[0008] In one implementation of the invention, the operation state
is a frequency mode for directing an electrical representation of a
ringing signal to the electric circuitry for providing an
illumination effect synchronised with the ringing signal.
[0009] In a further aspect of the present invention the user
exchangeable cover part may comprise one or more keys adapted to
play at least one sound, the one or more keys being connected to
the electric circuitry of the user exchangeable cover. The one or
more keys may be mapped to a set of tones and/or sound effects,
which set of tones and/or sound effects may comprise Music
Instrument Digital Interface (MIDI) tones ( ). The keys may be
adapted for sound creating purposes, which may comprise music
composing applications, sound creating applications, gaming, ring
tone creation, system sound creation, sending sounds with
Multimedia Messaging Service (MMS) or other messaging services, or
any combination thereof.
[0010] According to a further aspect of the invention a user
exchangeable cover is provided for releasable attachment to a
wireless communication terminal, the user exchangeable cover has an
electrical connector part for being electrically connected to the
wireless communication terminal in attached position. The user
exchangeable cover comprises identification means, and an electric
circuitry for supporting a user interface of the wireless terminal.
The connector part includes a plurality of connector holes, where
at least one of said connector holes is adapted to allow the
wireless terminal to operate the user exchangeable cover in an
identification state for sensing a value included in the
identification means, and afterwards in an operation state for
operating the electric circuitry of said user exchangeable cover
part.
[0011] The user exchangeable cover part may comprise one or more
keys adapted to play at least one sound, the one or more keys being
connected to the electric circuitry. The one or more keys may be
mapped to a set of tones and/or sound effects, which set of tones
and/or sound effects may comprise MIDI-tones. The keys may be
adapted for sound creating purposes, which may comprise music
composing applications, sound creating applications, gaming, ring
tone creation, system sound creation, sending sounds with MMS or
other messaging services, or any combination thereof.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] For a better understanding of the present invention and to
understand how the same may be brought into effect reference will
now be made, by way of example only, to the accompanying drawings,
in which:
[0013] FIG. 1 schematically illustrates a preferred embodiment of a
wireless telephone according to the invention.
[0014] FIG. 2 schematically illustrates a functional front cover
for the wireless telephone shown in FIG. 1.
[0015] FIG. 3 schematically shows the essential parts of a wireless
telephone for communication with e.g. a cellular network.
[0016] FIG. 4 shows electrical connection between the main block of
a wireless telephone and a functional front cover according to
preferred embodiments of the invention.
[0017] FIG. 5 shows the connection pad for connecting the wireless
telephone and a functional front cover according to the preferred
embodiment of the invention.
[0018] FIG. 6 shows the preferred embodiment for the connector part
mounted in the functional cover according to the preferred
embodiment of the invention.
[0019] FIG. 7 shows schematically in partial cross section the
connector part connecting the main block of a wireless telephone
and a functional front cover according to the preferred embodiments
of the invention.
[0020] FIG. 8 shows a flow chart illustrating the booting and mode
selection procedure according to the preferred embodiment of the
invention.
DETAILED DESCRIPTION OF THE INVENTION
[0021] FIG. 1 shows a preferred embodiment of a wireless terminal,
such as a cellular phone 1, which comprises a user interface having
a keypad 2, a display 3, an on/off button 4, a speaker 5 (only
openings are shown), and a microphone 6 (only openings are
shown).
[0022] According to the preferred embodiment of the invention the
keypad 2 has a first group 7 of keys as alphanumeric keys, two soft
keys 8, and a scroll-key 10 (up/down) for moving a cursor in the
display. Furthermore the keypad includes two call-handling keys 9
for initiating and terminating calls. The present functionality of
the soft keys 8 is shown in a separate field in the bottom of the
display 3 just above the soft keys 8.
[0023] The cellular phone 1 has an exchangeable functional front
cover 25. An exchangeable front cover is intended to be changed by
the user himself without use of tools. Such an exchangeable front
cover is disclosed in U.S. Ser. No. 09/503595 filed by the
applicant, and this disclosure is hereby incorporated by reference.
FIG. 2 shows the exchangeable functional front cover 25 according
to the invention.
[0024] FIG. 2 schematically shows the most important parts of a
preferred embodiment of the phone, said parts being essential to
the understanding of the invention. A processor 18, which supports
the GSM terminal software, also controls the communication with the
network via the transmitter/receiver circuit 19 and an antenna
20.
[0025] The microphone 6 transforms the user's speech into analogue
signals; the signals formed thereby are A/D converted in an A/D
converter (not shown) before the speech is encoded in an audio part
14. The encoded speech signal is transferred to the processor 18.
The processor 18 also forms the interface to a RAM memory 17a and a
Flash ROM memory 17b, a SIM card 16, the display 3 and the keypad 2
(as well as data, power supply, etc.). The audio part 14 speech
decodes the signal, which is transferred from the processor 18 to
the earpiece 5 via a D/A converter (not shown).
[0026] Furthermore a clock generator 24 supplies a clock signal to
the processor 18. The processor 18 is via a three or five wire bus
and a connector 41, 42, 44 connected to electronics 46 in the
functional cover 25.
[0027] A functional cover 25 is a cover for a wireless terminal 1,
which includes functionality that is implemented by adding
electronics 46 to the cover 25. To give some examples, it may
include an application reacting e.g. to the power supply or ringing
tone. It can also be an application that provides input to the
phone (e.g. touch pad).
[0028] The interface between the functional cover and the phone
will be described. Five different modes will be introduced, out of
which three are very simple and can be used for e.g. sensor
applications. The remaining two modes are the generic asynchronous
serial bus and a mode based on a synchronous data protocol.
[0029] The objective of the invention is not to provide a full
specification of all the different operation modes, but to allow
functional covers and transceivers to interact, even through all
the modes are not supported by both parts.
[0030] According to the preferred embodiment of the invention the
connector includes three connector pins, a positive power supply
voltage pin (V.sub.DD), a negative power supply voltage pin
(V.sub.SS) and a Cover Type Indicator pin (CTI).
[0031] Preferably the CTI-pin (Cover Type Indicator) is a
bi-directional and bi-mode (analogue/digital) signal pin. The
CTI-pin is used for a frequency mode, a PWM-mode and a
CTI-mode.
[0032] According to an alternative embodiment of the invention the
connector includes five connector pins. As for the first
embodiment, the connector includes a positive power supply voltage
pin (V.sub.DD), a negative power supply voltage pin (V.sub.SS), and
a Cover Type Indicator pin (CTI). Furthermore the connector
includes a Data Signal pin and a Clock Signal pin.
[0033] The Data Signal pin is used for asynchronous data in data
mode and in a synchronous data mode. The protocol for the
synchronous data mode may be according to the I2C-Bus
Specification, version 2.1, January 2000. The Clock Signal pin is
used for the clock in synchronous data mode.
1TABLE 1 Functional cover interface pins Output Pin type
Description Communication direction Vdd Power supply Transceiver to
Functional cover Vss Ground Transceiver to Functional cover CTI
Analogue Frequency output Transceiver to Functional cover Digital
PWM output Transceiver to Functional cover Analogue Cover Type
Functional cover to Indicator Transceiver Digital PWM input
Functional cover to Transceiver Data Digital Asynchronous data
Transceiver to Functional output cover Digital Synchronous data
Transceiver to Functional output cover Digital Asynchronous data-
Functional cover to input. Transceiver Digital Synchronous data
Functional cover to input Transceiver Clock Digital Clock output
Transceiver to Functional cover Digital Clock input Functional
cover to Transceiver
[0034] According to the invention, a baseband engine and a
functional cover do not have to support all the modes. This means
that the physical interface may comprise from three to five pins
depending on the number of supported modes.
[0035] If the BB engine supports multiple modes, passive mode is
not allowed to affect the active mode. This means for example, when
making the CTI measurement, other pins driving the CTI-pin must
have high impedance. Furthermore the baseband engine must be able
to drive R.sub.CTI.
[0036] When the wireless terminal 1 is switched on, or the
processor 18 detects that a new functional cover has been attached
to the transceiver part, a boot sequence is initiated. During the
boot, the type of the cover is detected via the CTI signal.
According to that information, the corresponding data mode is
selected and the appropriate power supply level, V.sub.dd, is
supplied. An example of the boot sequence and mode determination
process is presented in FIG. 8.
[0037] First the power is switched on to the phone in step 100.
Then the size of the CTI-resistor, R.sub.CTI, is measured in step
101. If the resistor measurement result in step 102 does not exceed
a predetermined value (e.g. 750 kOhm), the functional cover is
deemed to be attached and a further investigation in order to
identify the cover, has to be done. If the resistor measurement
result in step 102 exceeds the first predetermined value, the
functional cover is deemed to be present. The booting in step 103
has to be continued under the presumption that the cover does not
support the electric interface according to the invention.
[0038] If the processor 18 in step 104, identifies that the cover
is "intelligent", this means that the cover 25 has an asynchronous
or synchronous data interface, further information will be
exchanged via the digital interface in step 105. The digital
interface and the power scheme have to be defined. Hereafter the
booting with be continued in step 106.
[0039] If the cover in step 104 is deemed not to be "intelligent",
the CTI-resistor, R.sub.CTI, is compared with a second threshold
(e.g. 64.9 kOhm) and a third threshold (e.g. 93.1 kOhm), the cover
25, is deemed to have passive components only, and these components
are powered by the power supply of the wireless terminal 1. The
voltage is determined by the processor 18 in step 108 by means of a
look-up table. The booting is continued in step 109.
[0040] If the CTI-resistor, R.sub.CTI, falls outside the interval
defined by the second and the third threshold, the cover 25 is
deemed to be able to perform other modes as a pulse mode, a PWM
mode or a frequency mode. The mode and power scheme are determined
by the processor 18 in step 110 by means of a look-up table. The
booting is continued in step 111.
2TABLE 2 mode supported in dependence of the impedance R.sub.CTI.
Mode R_CTI value Synchronous data mode 2.00 kOhm Asynchronous data
mode 6.65 kOhm PWM data mode 30.90 kOhm 45.30 kOhm 64.90 kOhm CTI
data mode 93.10 kOhm 137.0 kOhm Freq. data mode 210.0 kOhm 357.0
kOhm 750.0 kOhm NO COVER .infin.
[0041] Table 2 above describes the CTI resistor value R.sub.CTI vs.
functionality conversion. The whole conversion range is preferably
divided into a predetermined number of different sub-ranges. For
the "intelligent" modes (synchronous and asynchronous), only one
resistor value has been reserved, since all the needed additional
information can be transferred via the interface. For PWM- and
CTI-modes, two resistor values are reserved and for the
Frequency-mode, four resistor values have been reserved.
[0042] The power control scheme is based on the CTI-information,
which is defined in the table 2. The electrical parameters of the
power supply include the power supply voltage VDD, the output
current IDD. The output impedance ZOUT of the wireless terminal is
1, and the power on time and power off time.
[0043] Data Interface Synchronous Mode (Data and Clock Pins)
[0044] The data specification used according to the invention may
be a sub set of I2C-bus specification version 2.1, January 2000, by
Philips Semiconductors. In the synchronous data mode the data pin
is used for transferring data between the wireless terminal 1 and
the functional cover 25, usually under control of the processor 18
and the clock oscillator 24 associated therewith.
[0045] Data Interface Asynchronous Mode (Data Pin)
[0046] Data is transferred in the asynchronous data mode based on
an asynchronous half-duplex signal. The power supply may be in the
level of V.sub.DD=2.7V with a data rate of up to 230 kbps.
[0047] The asynchronous data mode as well as the synchronous data
mode may be used for loading data from multi-media memory card
(MMC) like memories included in the functional cover 25 into the
wireless terminal for being handled by means of the processor 18.
Such a data connection may be used for loading data from
multi-media memory card (MMC), like memories included in the
functional cover 25, into the wireless terminal for being handled
by means of the processor 18. These data may include, e.g. MP3
music files and executable games. Hereby it has become possible to
provide a gaming cover, perhaps having an extra joystick, whose
operation is sensed by the gaming cover and transferred to the
wireless terminal via the data pin. The game may also be run on an
extra processor included in the functional cover 25, but using the
display 3 of the wireless terminal 1. Extra UI units as a touch
sensitive pad/screen or an extra display may be provided on the
functional cover 25 and controlled by the processor 18.
[0048] Alternatively, the functional cover 25 is adapted for a
music composer application or any sound creating application
designating keys to be assigned to tones and/or sound effects. A
default mapping between the keys and a set of tones and/or sound
effects is provided. However, a user is enabled to select a number
of tones and/or sound effects, and to map these tones and/or sound
effects to the keys. Repeated tone, fading tone or any other sound
may be mapped to e.g. pressing a key for a particular long period
of time or pressing a key together with a shift key. The tones
and/or sound effects comprise sounds provided by the wireless
terminal 1, and/or MIDI-tones.
[0049] The MIDI protocol is an entire music description language in
binary form. Each word describing an action of musical performance
is assigned a specific binary code. The protocol also includes
percussion oriented actions. To sound a note in MIDI language a
"Note On" message is sent, and then a note "velocity" is assigned,
which determines how loud the note is played. Other MIDI messages
include selecting which instrument to play, mixing and panning
sounds, and controlling various aspects of electronic musical
instruments. Normally, a wave table comprising available sounds is
used for sound creation according to the MIDI music description.
While MIDI is musical performance information, the term MIDI-tones
is here the audio output from the entire MIDI system.
[0050] Further, the functional cover 25 comprises memory and
processing capabilities so as to provide an ability to create
sounds. The memory may comprise wave tables, sound clips, or any
other sound information required by said music composer application
or sound creating application. Processing capabilities are needed
for audio processing. Processing capabilities and memory may be
located in the functional cover 25, in the wireless terminal 1, or
any combination thereof.
[0051] The sound creating capabilities are used for music composing
applications, sound creating applications, gaming, ring tone
creation, system sound creation, sending sounds with MMS
(Multimedia Messaging Service) or other messaging service, or any
combination thereof.
[0052] PWM Data Mode (Via CTI-Pin)
[0053] Data is transferred using bi-directional CMOS level
PWM-modulated CTI-signal. The power supply may be in the level of
V.sub.DD=2.7V. The pulse signal may have a variable frequency up to
32 kHz. The pulse duty cycle may be varied between 0.01 and 1. This
is an analogue signal in digital format, whereby a sound can easily
be transferred ref. buzzer signal.
[0054] CTI Data Mode (Via CTI-Pin)
[0055] The type information of the cover is given in the CTI. I.e.
the processor 18 detects the value of the pull down resistor during
the start-up (boot) of the phone and selects the right data and
power interface mode according to the predefined table.
[0056] This mode is very applicable for applications that do not
need any stimulus from the wireless terminal. A flashlight is a
good example of such an application.
[0057] Frequency Mode (Via CTI-Pin)
[0058] In the frequency mode, the functional cover 25 is controlled
with the frequency of the CTI-signal. Amplitude information is not
needed. Therefore the driving signal can be a small analogue
voltage, which is then amplified in the cover end. The frequency
signal may according to the preferred embodiment be variable up to
10 kHz.
[0059] This mode can be used to direct a ringing tone to the
functional cover 25. Once there, it can be used as a stimulus, for
example driving a "light organ".
[0060] The connector interface may comprise three to five pins and
associated pads. The electrical requirements for different signal
pins will probably be quite different. The CTI-pin will be used for
low, whereas clock and data will be used for medium bandwidth
communication. For high bandwidth communication something more
sophisticated is needed. As a result, the connector has to be
designed with a view to optimising the connector with regard to
performance and cost.
[0061] The interface on the wireless terminal comprises three to
five signal pads for interacting with a similar amount of pogo pins
41, which are included in the cover 25.
3TABLE 3 Pin order and pad sizes Pin name Pin no A D Unit CTI 1.
4.3 2 mm V.sub.SS 2. V.sub.DD 3. Data 4. Clock 5.
[0062] The order of the pins appears from FIGS. 4 and 5. The pins
41 are arranged in a line in equal distance, A. The diameter, D, of
the five pads 44 is substantially greater than the diameter of the
plungers 42 of the pins 41 in order to ensure a reliable
connection.
[0063] It shall be noted that the wireless terminal 1 may have five
pads 44. If the functional cover does not support the data modes,
only three pins 41 are needed, and these three pins 41 engage the
pad 44 corresponding,to pins no 1-3.
[0064] The connector according to the preferred embodiment of the
invention comprises three Pogo-pins 41 (spring-loaded contacts)
mounted on a rigid Printed Wiring Board 40.
[0065] The pogo-pins 41 are mechanically fixed and soldered on the
Printed Wiring Board 40 in order to maintain safe and low
resistance contact between the phone's main Printed Wiring Board
and Functional Cover's small rigid Printed Wiring Board 40. A
plunger 42 travel should be at least 1 mm, and the pressure force
between plunger and main Printed Wiring Board's pads should be
minimum 25 g for use in a standard wireless terminal. The pad
dimensions and spacing are given in table 4 above.
[0066] Pins may advantageously be gold-plated, and their internal
resistance has to be specified according to the application.
Preferably the internal resistance does exceed 100 m.OMEGA. even
after 10,000 cycles.
[0067] FIG. 7 shows the wireless terminal 1 with the front cover 25
lifted. The pads 44 are arranged on the printed wiring board 43 of
the terminal. The printed wiring board 43 is covered by a light
guide 45 of transparent plastic, which has openings allowing the
con-nector pins 41,42 to access the pads. The connector pins 41,42
are mounted on a printed wiring board 40.
[0068] The printed wiring board 40 is mounted on the inner side of
the cover 25 by means of snap coupling means 48. On the rear side
of the printed wiring board 40 an electric circuitry is provided
including e.g. three LED's 47 illuminating respective pipe formed
light-guides 49. In, the frequency mode an electrical
representation of a ringing signal is directed to the electric
circuitry for providing an illumination effect following the
ringing signal. The light-guides 49 may be illuminated individually
in a tempo following the ringing signal. This gives an exciting
effect for the user when the functional cover 25 is partly
transparent.
* * * * *