1. An apparatus (1) for the positioning of a measuring device (10) having an annular or arcuate track (11) on which the measuring device (10) is supported and for the positioning of the sensing head (100) of the measuring device (10) at a position radial to the track (11) characterised in that the apparatus has a crossbeam (14) which supports the measuring device (10), bearings (12, 13) arranged between the track (11) and the crossbeam (14) and a device for the changing of the position of the crossbeam (14) with the measuring device (10) in a radial direction to the track (11) with respect to the track (14).
2. An apparatus (1) in accordance with claim 1 wherein the bearings between the track (11) and the crossbeam (14) are swivelling bolsters (12, 13) which are movable towards one another, away from one another and in the same direction on the track (11) at the same or at different speeds and wherein at least one of the swivelling bolsters (12, 13), preferably both swivelling bolsters (12, 13), are displaceable with respect to the crossbeam (14).
3. An apparatus (1) in accordance with claim 1 or claim 2, wherein at least one of the swivelling bolsters (12, 13) has a drive motor, preferably an electric motor, in order to move the swivelling bolsters (12, 13) and the crossbeam (14) with the measuring device (10) on the track (11).
4. An apparatus (3) in accordance with claim 1 having an annular or ring segment-like track (31) which has two rings (311, 312) or segments which are displaceable relative to one another by turning and wherein the crossbeam (34) is doubly supported on the track (31) and one each of the bearings (32, 33) is connected to one of the two rings (311, 312) or segments.
5. An apparatus (3) in accordance with claim 4 having a device for the synchronous turning of the rings (311, 312) or segments of the track (31) andor for the synchronous turning or synchronous turning to and fro of the rings (311, 312) with the crossbeam (34).
6. An apparatus in accordance with one of claims 1 to 5 wherein the measuring device (10) is arranged displaceably in the longitudinal direction of the crossbeam (14).
7. An apparatus in accordance with one of claims 1 to 6 having a measuring device (10) with a support arm (101) on which the sensing head (100) of the measuring unit (10) is arranged and which is displaceably or telescopically extendable obliquely or transversely to the longitudinal direction of the crossbeam (14), preferably in a radial direction to the track (11).
8. An apparatus in accordance with one of claims 1 to 7 having a circular track (11) with a diameter in the range from one to eight meters and a crossbeam (14) with a length in the range from 0.5 to 8 meters.
9. An apparatus in accordance with one of claims 1 to 8 having a measuring unit (10) for measuring the thickness of plastic films and having a measuring system which operates capacitively using a Hall probe or with ionising radiation, in particular with or radiation.
10. An apparatus in accordance with one of claims 1 to 9 wherein the transmission of measuring and control signals from and to the measuring unit (10) is effected by modulation onto the supply voltage via the feed line andor via separate signal lines andor in a wireless manner.
11. An apparatus in accordance with one of claims 1 to 10 wherein the transmission of the electric feed and of measuring and control signals from andor to the movable measuring unit (10) is effected at least in part via sliding contacts.
12. An apparatus in accordance with one of claims 1 to 11 having a device (1213) which holds the measuring unit in a fixed spatial position on the crossbeam (14) or on the chord formed by the crossbeam (14) with the track (11), preferably at the centre of said chord.
13. An apparatus in accordance with one of claims 1 to 12 wherein each of the swivelling bolsters (12,13) or rings (311, 312) have one stepping motor each for the drive and a control for the exact independent controlling of the stepping motors, with the same frequency or with different frequencies, and for the moving of the swivelling bolsters (12, 13) or rings (311, 312) in the same direction or in different directions and at the same speed or at different speeds.
14. An apparatus in accordance with one of claims 1 to 13 wherein each of the swivelling bolsters (12, 13) or rings (311, 312) have a asynchronous motor, in particular a linear induction motor or a motor with a friction wheel for the drive, and an arrangement for determining the exact position of the swivelling bolsters (12,13) on the track (11) and a control for independently controlling the motors with the same frequency or different frequencies and for, with the same frequency or with different frequencies, and for the moving of the swivelling bolsters (12, 13) or rings (311, 312) in the same direction or in opposite directions and at the same speed or at different speeds.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A lighting device for an electronic or electromechanical apparatus, the lighting device including:
a display device for displaying time-related data or data not related to time;
a light source arranged to light the display device and to measure intensity of ambient light;
a measurement stage that provides an electric signal representative of the ambient lighting conditions;
a memory stage that stores an electric state corresponding to a low or strong luminosity level as a function of the electric signal generated by the measurement stage; and
a third stage which, when a signal ordering the light source to be switched on is produced, adapts the intensity of the light provided by said light source as a function of the electric state stored in the memory stage.
2. The lighting device according to claim 1, wherein the measurement stage includes the light source associated with a transistor so as to form a current generator controlled by the ambient light intensity.
3. The lighting device according to claim 2, wherein the memory stage includes a capacitor connected in parallel to terminals of a resistor so as to form an RC circuit whose time constant value is adjusted as a function of the capacitance values of the capacitor and the resistor.
4. The lighting device according to claim 3, wherein the time constant value corresponds to the time necessary for the human eye to become accustomed to the dark.
5. The lighting device according to claim 3, wherein a circuit controlling the switching on of the light source includes a flip flop mounted following the circuit formed by the capacitor and the resistor, the high or low state of a logic input D of the flip flop being a function of the state of charge of the capacitor, this state being transferred to a logic output Q of the same flip flop upon reception of the control signal ordering the light source to be switched on, the output Q of said flip flop then controlling means capable of powering the light source with strong or weak current depending upon whether the logic state of said output Q is high or low.
6. The lighting device according to claim 5, wherein the means for controlling the intensity of the current powering the light source includes at least two series connected resistors, one of which short-circuits by a transistor arranged across the terminals of the one resistor when the transistor is made conductive.
7. The lighting device according to claim 5, wherein the control signal is generated by a timing circuit, this timing circuit ordering closure of switching means for connecting the light source to a power source and determining the time during which said light source will remain switched on.
8. The lighting device according to claim 7, wherein the switching means include a transistor.
9. The lighting device according to claim 7, wherein the light source is powered with a timing with respect to the transmission of the control signal for switching on said light source.
10. The lighting device according to claim 9, wherein the timing is generated by an RC circuit including a capacitor and a resistor.
11. The lighting device according to claim 5, wherein when the light source is switched off, a second timing circuit resets the logic output Q of the flip flop to zero.
12. The lighting device according to claim 3, Wherein the memory stage is separated from the measurement stage by an anti-return diode preventing the capacitor from discharging into said measurement stage.
13. The lighting device according to claim 3, wherein switching means are arranged between the measurement stage and the memory stage, these switching means being conductive for as long as the light source measures the ambient light intensity, and being non conductive upon reception of the signal ordering the light source to be switched on in order to avoid disturbing the state of charge of said memory stage.
14. The lighting device according to claim 13, wherein the switching means include a transistor.
15. A lighting method for a device displaying time-related data, or data not related to time, for an electronic or electromechanical apparatus, wherein the method includes the steps of:
providing an electronic or electromechanical apparatus having a display device for displaying time-related data, or data not related to time, wherein the apparatus includes
a light source arranged to light the display device and to measure the intensity of ambient light and
a programmable circuit connected to power the light source;
programming the programmable circuit with times for adapting the lighting of the light source to day and night vision conditions;
lighting the display device with the light source; and
measuring the intensity of ambient light using the light source.