FR2590725A1 - FLUORESCENT TUBE LAMP - Google Patents

Abstract

The invention relates to a fluorescent tube lamp comprising in the enclosure 2 formed by a hollow cylindrical casing 20, blind at one end 21, closed at the other end by a base 1, a fluorescent tube 5 forming a succession of loops arranged along a polygonal contour, characterized in that this tube is mounted on an annular support and fixing plate 3 made of reflective material, said lamp further comprising a central reflector 6 formed by a hollow cylinder 60 whose base is a polygon with n sides, an electronic circuit 4 for supplying and starting the fluorescent tube. (CF DRAWING IN BOPI)

Description

- 1 -

FLUORESCENT TUBE LAMP

  The present invention relates to a fluorescent tube lamp which

  can operate either on a DC current or from the mains.

  It is known fluorescent tube lamps operating on mains, the fluorescent tube is fed through a self limiting current. This self, called ballast, is of a high weight and a volume

  important. Therefore, existing fluorescent tube bulbs-

  have dimensions larger than the normal dimensions of

  incandescent filament lamps and are of a significantly higher weight.

  These disadvantages impede the use of this type of bulb as soon as the weight or the volume of the lamp can become a gene (for example in

architect lamps).

  The object of the present invention is to provide a fluorescent tube lamp.

  cent overcoming the above drawbacks and may have a range of light power corresponding to the luminous powers of the lamps

  filaments, while having equivalent weight and dimensions.

  This first object is achieved by the fact that the fluorescent tube lamp comprises, in the enclosure formed by a hollow envelope, cylindrical, blind at one end and closed at the other end by a base, a fluorescent tube forming a succession of loops arranged in a polygonal contour, this fluorescent tube being mounted on an annular plate:

  of support and fixation of reflective material, said lamp comprising

  in addition, a central reflector formed by a hollow cylinder whose base is a polygon with n sides, an electronic circuit supply and

start of the fluorescent tube.

  A second object of the invention is to improve the efficiency of a

such a lamp.

  This second aim is achieved by the fact that, in the lamp, the electronic circuit delivers, from a DC voltage supply, a current of frequency greater than the frequency of 50 Hz of the sector.

  and having a form factor of less than 1.7.

  This second object is also achieved by the fact that, in the lamp, the central reflector is mounted tight on a flange integral with the annular plate and comprises, at the opposite end to the annular plate,

  a pyramidal hat with a polygonal base, whose polygon is offset

  the stretch of 21., so as to have its sides parallel to the loops of the 4n

  fluorescent tube adjacent to the first end.

  A third object of the invention is to have a tube lamp

  fluorescent that can work in all applications.

  This third goal is achieved by the fact that, in the lamp, the DC voltage is obtained, either by an accumulator, or by the tension

  of the sector, by a rectifier circuit integrated in the electronic circuit.

  According to another characteristic, in the lamp, the polygonal contour of the adjacent fluorescent tube loops of the base is offset from the polygonal contour of the loops located near the first end of the lamp.

the enclosure of an angle 21.

  4n According to another characteristic, in the lamp, the sides of the polygon of the base of the hollow cylinder of the central reflector, are parallel to the

  polygonal outline of the fluorescent tube loops, adjacent to the pellet.

  According to another characteristic, the polygonal outlines are six

or eight are.

  Other features and advantages of the present invention are

  will become clearer when reading the description given as a reference

  In the drawings below, in which - Figure 1 shows a sectional and perspective view of the lamp; - Figure 2 shows a perspective view of the upper part of the central reflector of the lamp. FIG. 1 shows a fluorescent tube lamp (5) according to the invention having the normal dimensions of a filament lamp which are of the order of 70 mm in diameter and 180 mm in length. This lamp comprises a base (1) provided with a thread (10) allowing, in known manner, its fixing in a socket. A central stud (11) of connection is connected

  by a wire (41) to a block (4) representing the electronic circuit enabling

  both to ensure, on the one hand, the "starter" function of lighting

  fluorescent tube, on the other hand the "ballast"

  current in operation. An insulator (12) isolates electrical

  the central stud (11) of the threaded portion of the base to which is connected by a second wire (40) the electronic circuit. The son (42) and (43) output of the electronic circuit (4) can supply, by the wire (43) a first end (52 f) of the fluorescent tube and the wire (42) the

  second end (52 e) not visible from the fluorescent tube. The fluorescent tube

  cent (5) describes, forming loops, a parallel circular path

  at the annular edges (13) of the base (1). On the outer surface of the annular edge

  The wheel (13) is mounted by any means known to those skilled in the art, a cylindrical hollow envelope (20), blind at a first end, so as to form a closed chamber (2) with the base. This hollow cylindrical envelope, made of material allowing the passage of light, is closed at its first end by a surface (21). On the inner surface of the annular flange (13) is mounted by any means known to those skilled in the art, an annular plate (3) having a central orifice (31) provided

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  -4 - a rim (30). The annular plate (3) comprises, as can be seen in FIG. 1, an orifice (33) of dimension corresponding to the dimension of the fluorescent tube in which the end (52 f) of this tube which is connected by the conducting wire (43) to the electronic circuit (4). As can be understood, the conductive wire (42) will be connected to the second end (52 e) of the tube which also passes through a hole (32), not shown.

  and adjacent to the hole (33). On the edge of the plate (3) made of

  Intense, comes a reflector (6). This reflector (6) comprises, as can be seen in Figures 1 and 2, a cylindrical body (60), closed at one end by a pyramidal cap (61). The open end of this reflector (6) is tightly mounted on the flange (30). The cylindrical body (60) comprises, as can be seen in Figure 2, a base whose vertices are coincident with the vertices of a hexagon and the summers connecting each vertex are constituted by arcs of cerele. This base will constitute what will be called thereafter a polygonal contour whose sides are (60 a) to (60 f). The pyramidal hat (61) also includes

  a polygonal base with six sides (61 a) to (61 f) whose ends adJa

  The cylindrical body members (60) form a curved surface that joins the vertices of the polygon forming the base of the cylinder. It will be noted in FIG. 2 that the polygon forming the base of the pyramidal cap is angularly shifted by a value of 15 '= 21 T with n = 6 relative to the polygon 4 n.

  forming the base of the cylindrical portion (60) of the reflector. The fluorescent tube

  rescent (5) forms a succession of loops having a U-shaped cross-section so that two consecutive loops have their U-shaped cross section oriented in opposite directions. These loops are arranged

  parallel to the walls of the enclosure (2), the reflector (6) and the intd-

  of the hollow volume delimited by these walls. As can be noted, a first loop is shifted from its next one which is in the opposite direction of an angle of 15 = 21W with n-6, while two consecutive loops 4n of the same direction are shifted between them. an angle of 600. Thus, a first loop is constituted by the vertical portions (52 f, 52 fa)

  and by the portion (51 f) which is of direction perpendicular to the por-

  (52 f, 52 f a) and parallel to the surface (21). The following loop is constituted by the portions (52 f a, 52 a), which are parallel in direction to the cylindrical sides (20) and (60 a) and by the central portion (50 a), which

  is adjacent to the annular plate (3) and of direction parallel to that

  this. The loop having a central part (51 f) of the tube is of direction opposite to the loop having the central portion (50 a) of the tube. The consecutive and directional loop identical to that having the central portion of the part (51 f) consists of the elements (52 a), (51a)

  and (52 a b). The fluorescent tube is thus formed by a succession of

  of the fluorescent tube, adjacent the base (1) and the plate (3) and a second succession of loops, of the fluorescent tube, adjacent to the

  first end (21) of the enclosure. These two sets of strong loops

  a single continuous tube starting with the end (52 f) and ending with the end (52 e) that is not visible. The loops (50 a,

  b, 50 c, 50 d, 50 e), the loop (50 f) does not exist because it is replaced by

  placed by the links (43) and (42), are arranged in a hexagonal contour, parallel to the hexagonal contour (60 a) to (60 e) of the cylinder (60) of the reflector (6). The second series of loops comprising the central portions (51 f), (51 a), (51 e), loops which are located near the first end (21) of the enclosure, are arranged in a polygonal contour, parallel the contour (61 a) to (61 f) constituting the base of the pyramidal cap (61). Since the lower loops (50a) are shifted from the upper loops (51f), (51a) to an angle corresponding to now, the interest of the angle shift of 15 = 2T between 4n -6 - the base polygon of the reflector cylinder (60) and the base polygon of

  pyramidal cap (61). Indeed, this makes it possible to have the central portion

  (50 b) and the side portions (52 a b) and (52 b) arranged symmetrically

  with respect to the concave surface (60b) of the reflective cylinder

  tor (60), so that a radius (C), emerging from the tube (52 ab) in the direction

  reflector (60) is reflected towards the outer face of the enclosure (2).

  This arrangement allows parallel to have the upper adjacent portions (51a) and (51b) arranged parallel to the faces (61a) and (61b) of the pyramidal cap so that a radius (B), emerging from the face (51 a) of the tube, turned towards the pyramidal hat be reflected

  towards the outside of the enclosure closed by the surface (21).

  It will be the same for the radius (A) emitted by the face of the portion

  tube (51b) turned towards the reflector (61b). O note-

  ra that this arrangement of elements allows to release a volume

  hollow inside the cylindrical reflector (60). This common hollow volume

  by the opening (31), with the part of the base (1) which contains the circuit

  electronics (4), which makes it possible to penetrate, possibly, the

  electronic cookware (4) in this hollow volume portion, if the need arises

  makes you feel. The electronic circuit (4), serving as "ballast", function-

  will be at a frequency of the order of 20 to 25 KEz. This frequency, much higher than the sector frequency of 50 Hertz, significantly improves the luminous efficiency of the fluorescent tube because of the better tearing of electrons, cathodes by thermal agitation. Similarly, this electronic circuit (4) supplies the electrodes with the ends of the fluorescent tube

  (5) a current having a form factor of less than 1.7. Remind us-

  The form factor is equal to the ratio of the rms current to the peak current. This electronic circuit (4) is intended to be supplied normally by a DC voltage of 12 or 24 volts which enables

  lamp applications for emergency lighting, for example.

  However, to this electronic circuit (4), one can add a rectifying circuit which allows, from the seeter, to deliver

  the DC voltage required to supply the electronic circuit (4).

  This variant allows the use of the lamp for domestic lighting. A lamp having a six-sided polygonal contour has been presented and described, but it is obvious that, to enable the lamp to cover a range of light power equivalent to the illumination of an electric power filament lamp, varying from 25 to 100 watts, it may be necessary to have an eight-side polygonal contour. We have an interest in choosing

  an eight-sided polygonal contour, as this makes it easier to reach

  the power of the high light, and when you want to reduce the power, to go from 100 Watts to 25 Watts, it is enough to reduce the length of the sides (52 f, 52 f, 52 a, 52 ab etc ...) The smaller the proportion that the polygonal contour will have, since the luminous power of a fluorescent tube is proportional to its length. Finally, it will be noted that by eliminating the "self-ballast" and replacing it with an "electronic ballast", not only does one gain in weight, but one improves the efficiency of the lamp because the losses by joule effect of the self are removed. and, on the other hand, for a given volume, it is possible to increase the luminous power of the tube situated in this volume, since the heating of the lamp is due to the tube and no longer to the tube.

  the inductive tube-ballast assembly as in the prior art. This neo

  was, moreover, to use a support plate as radiator of the

  "ballast" to the external surfaces of the lamp.

  With the lamp which we have just described, it is thus possible, in the dimensions and the weight of a normal lamp, to have lamps whose luminous power equivalent to the illumination of a filament lamp.

  covers a range of 25 to 100 Watts, with electrical power consump-

  from 8 to 24 Watts, that is to say with an energy efficiency of 4.

  Any modification to the scope of the skilled person is also

part of the spirit of the invention.

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Claims (7)

CLAIMS I 0ON S   1) Fluorescent tube lamp comprising in the enclosure (2) formed by a cylindrical hollow envelope (20), blind at one end (21), closed at the other end by a base (1), a fluorescent tube ( 5) forming   a succession of loops arranged along a polygonal contour,   characterized in that said tube is mounted on an annular plate (3) for supporting and fixing reflective material said lamp further comprising a central reflector (6) formed by a hollow cylinder (60) whose base is a polygon In addition, an electronic circuit (4) for feeding and start of the fluorescent tube.   2) Lamp according to claim 1, characterized in that the electronic circuit (4) delivers, from a DC voltage supply, a current of frequency greater than the frequency of 50 Hz of the sector and   having a form factor of less than 1.7.   3) Lamp according to claim 2, characterized in that the DC voltage is obtained, either by an accumulator, or from the voltage   of the sector by a rectifier circuit integrated in the electronic circuit (4).   4) Lamp according to one of the preceding claims, characterized in that   that the polygonal contour of the adjacent fluorescent tube loops of the base (1) is offset from the polygonal contour of the loops of the fluorescent tube located near the first end (21) of the enclosure, a angle (21). 4n   Lamp according to one of the preceding claims, characterized in that - 10 -   the central reflector (6) is mounted tightly on a flange (30), integral with the annular plate (3) and comprises, at the end opposite the annular plate (3), a pyramidal cap (61) with a polygonal base of which the polygon is angularly offset by 21T with respect to the polygon of the 4n cylinder (60), so as to have its sides parallel to the tube loops   fluorescent adjacent to the first end.   6) Lamp according to one of the preceding claims, characterized in that   that the cylinders of the polygon of the base of the hollow cylinder (60) of the reflector   are parallel to the polygonal contour of the loops of the fluorescent tube. adjacent cent of the pellet (1).   7) Lamp according to one of claims 1, 4, 5, 6, characterized in that   that the number of sides of the polygonal outlines is greater than 4.   8) Lamp according to claim 7, characterized in that the number of   sides of the polygonal contours is preferably 6 or 8.