FR2739174A1 - MOTOR VEHICLE PROJECTOR - Google Patents

Abstract

Projector comprising a reflector (10) with a reflecting internal face (12) with concave curvature and having an opening (14) at its top for receiving the bulb holder (20) provided with a light source (22). The support (20) is mounted from the inside of the reflector and comprises a segment (28) in the form of a tab housed in a cavity (25) at the edge of the opening (14) of the reflector (10). The bulb holder (20) is fixed by a fixing means (30) on the reflector (10). The mounting of the support (20) from the inside on the reflector guarantees it an exact positioning.

Description

State of the art.

  The invention relates to a headlight for a vehicle,

  comprising a reflector having a reflective inner face

  health with a concave curvature and, at its apex, one or

  green receiving a bulb holder itself provided with a

  light source, this support being fixed to the reflector.

  Such a projector is already known according to document DE 43 23 991 A1. This projector includes a reflector, the

  reflective inner side is curved concave.

  At its top, the reflector has an opening receiving a bulb holder, fixed to the reflector. The support receives a light source passing through the opening. The bulb holder is mounted on the reflector passing from the side

  rear of the reflector opposite to the interior reflective

  concave curvature health. When manufacturing the reflector, it is first of all necessary to ensure that its inner face has only very small manufacturing tolerances because the defects

  deflect the light beam reflected by the reflector.

  On the other hand, the rear face of the reflector can be marred by significant manufacturing tolerances since this face has no optical role. If the reflector is for example manufactured by injection, its inner face and its rear face are formed with different molding tools which may, if necessary, have defects linked to tolerances and which result in dimensional deviations between the inner face and the face. rear or exterior of the reflector. The disadvantage of mounting the bulb holder by the rear side of the reflector

  is that the bulb holder can take different positions

  annuities due to manufacturing tolerances. This has repercussions on the light source thus installed which, because of the different positions it can take relative to the

  reflective inner side of the reflector, produces

  annoying viations of the light beam reflected by the reflective

  tor. This is particularly troublesome in the case of a light source emitting a large luminous flux such as for example

a gas discharge lamp.

Advantages of the invention.

  The object of the present invention is to remedy these drawbacks and to this end relates to a headlamp characterized in that the bulb holder is provided on the reflective inner face of the reflector. The projector according to the invention, the bulb holder of which is mounted with extremely small tolerances

  relative to the reflective interior surface of the reflective

  tor, allows to position the light source in a pre-

  in relation to the interior surface of the projector.

  According to an advantageous characteristic of the invention

  tion, the bulb holder is fixed with at least one element

  fixing on the reflector by crossing it from the rear.

  This realization allows a simple and secure fixing.

rantie of the bulb holder.

  According to another advantageous characteristic of the invention, the bulb holder is mounted in the cavity with little transverse and longitudinal play with respect to the axis

reflector optics.

  This allows exact positioning of the support

bulb on the reflector.

  According to other advantageous characteristics: - the bulb holder comes to bear against the reflector

  in the opposite direction to the exit direction of the

mother;

  - the reflector comprises, at the level of its inner surface

  flexing near the edge surrounding the opening, a cavity for the bulb holder; - the bulb holder has a leg-shaped segment by which this holder is mounted in the cavity;

  - the bulb holder is a piece of injected metal and in particular-

  light metal; - the light source is a gas discharge lamp; - the bulb holder (20) includes a screen device which partially cuts off the light emitted by the light source; - At least part of the screen device is integral with the bulb holder; - the screen device has two opposite branches

  to each other, located laterally next to the light source

  miner and extending in the direction of light exit and the upper edges of the branches form the limit

  light / darkness for the light beam coming out of the projector

tor. Drawings.

  An embodiment of the invention is shown

  felt in the drawings and will be described below in more detail. So:

  - Figure 1 shows a horizontal longitudinal section

  zontal of a headlamp, - Figure 2 shows a detail of the headlamp in a vertical longitudinal section, - Figure 3 shows a detail of the headlamp in a cross section corresponding to line III-III of the

  figure 2. Description of the exemplary embodiment.

  A headlight for a motor vehicle, shown in FIGS. 1 to 3, comprises a reflector 10 with a face

  reflective surface 12 with concave curvature. The reflector 1025 has an opening 14 on its rear face opposite its face

  reflective interior and at the top. The re-

  flector 10 mounts in an adjustable manner in a housing 16 and can have different zones associated with different lighting functions, such as for example the low beam

  and / or the long distance light and / or the fog light.

  The light exit orifice of the housing 16 is closed by a transparent glass 18. On the rear side, the housing 16 comprises

  at least one opening 17 which closes with a cap 19.

  The projector can also be a modular projector.

  nobloc, the glass 18 of which is connected to the reflector 10, itself mounted adjustable on a frame.

  At its opening 14, provided at its top, the reflector 10 receives a bulb holder 20 in which is

  accommodates a light source 22 passing through the opening 14 for

  river at the reflective interior surface 12 of the

  reflector 10. The bulb holder 20 has a segment

  térieur 21 hollow cylindrical, stepped, for receiving the base 23 for the light source 22. The inner segment 21 is formed to receive the base 23 of the light source 22

  with as little play as possible in the transverse direction

  transverse and in the longitudinal direction of the optical axis 11

  of the reflector 10, and the base 23 comes to bear against the segment

  inside with its shoulder, in the direction of exit

  of light 26. In addition, the interior segment 21 can be reacted

  so that the base 23 can only be mounted in a certain

  position of rotation, to guarantee the correct mounting of

the light source 22.

  The reflector 10 has, on its reflective inner face 12, at the edge surrounding the opening 14, a housing 25 for the bulb holder 20; this housing is formed by a recess recessed in the direction opposite to the

  light exit direction 26, i.e. in the direction

  opposite to that of the light beams reflected by the

  reflective interior surface 12 of reflector 10. The support

  bulb port 20 comprises, at its end opposite to the direction of light exit 26, a segment 28 in the form of a tab by which it is housed in the cavity 25. The segment

  28 in the shape of a paw can occupy the entire periphery of the support

  bulb port 20 or only part of the periphery in the form of several projecting parts. Preferably, the flange-shaped segment 28 of the bulb holder 20 is mounted with a small clearance transverse to the optical axis 11 of the reflector 10 in the cavity 25, so that it is in a determined position relative to the reflector 10. The bulb holder 20 is mounted relative to the surface

  reflective interior 12 of reflector 10, in the direction

  opposite to the direction of light output 26 and, in po-

  end position, it comes to rest against the bottom of the cavity 25, in the direction opposite to the exit direction

of light 26.

  The bulb holder 20 is fixed to the reflector 10 by means of one or more fixing elements 30 engaged by the rear of the reflector 10 through openings provided in the edge of the opening 14 and coming to grip on the segment 28 in the shape of a paw. The fastening elements 30 may be screws housed in corresponding threads of the segment

  28. The fastening elements 30 can also be ri-

  vets as shown; these rivets cross the ou-

  corresponding vertices of the segment 28 passing in the direction of the light exit direction 28, then the rivets are matted. The fastening elements 30 hold the segment 28 in the form of a tab of the bulb holder 20, bearing against the

bottom of housing 25.

  The light source 22 is engaged from the rear of the reflector 10 in the direction of light exit

  26, by engagement of its base 23 in segment 21 of the sup-

  bulb holder 20; its glass socket 24 passes through the opening

  14 to reach the reflective inner side 12 of the reflector

  reflector 10. The light source 22 may be a bulb

  candles or a gas discharge bulb; it is fixed in the bulb holder 20 using the fixing element 32. The fixing element 32 can be made, for example

  as shown, in a known manner, of an elastic stirrup

  tick pivotally mounted on the bulb holder 20 and applied

  as against the base 23, or in the form of a ring-

  hat slipped over the base 23.

  The reflector 10 can be made of a material

  heat resistant plastic, and be manufactured by injec-

  tion. The tool used to manufacture the reflector consists of

  laying of two parts; one of the two parts of the tool makes it possible to mold the internal face of the reflector 10 and the other the external face or rear face. One of the parts of the tool must be able to move relative to the other to release the reflector 10. The housing 25 of the bulb holder 20 and the inner face 12 of the reflector 10 are made with the same part of tool which therefore has to comply with strict manufacturing tolerances. The bulb holder 20 mounts, thus

  relative to the reflective interior surface 12 of the

  flector 10, with very reduced tolerances with respect to this internal surface 12. The bulb holder 20 is preferably an injected part, for example a part made of injected metal, and in particular of light metal such as aluminum. As a variant, the bulb holder 20 can also be made of shaped sheet metal or of heat-resistant plastic,

manufactured by injection.

  The bulb holder 20 may further comprise a screen device 40 which cuts off part of the light emitted by the light source 22 so that this light cannot reach the reflective interior surface 12 of the reflector 10 and / or leave the projector. . The screen device 40 comprises for example a cup 42 passing under the glass bulb of the light source 22 and extending from the leg-shaped segment 28 of the bulb holder 20 in the direction of light output 26 ; this cup 42

  is opaque. It cuts the light directed by the light source

  neuse 22 towards the lower zone of the reflector 10. The cup 42 may be a separate piece, fixed to the bulb holder 20;

  it can also be integrated with the bulb holder 20.

  The screen device 40 may further include a cap

  opaque cap 44 fixed to the end zone of the cup 42,

  in the light exit direction 26, and stopping the light

  light emitted by light source 22, which would come out directly-

  of the projector, i.e. without being reflected by the

  inner face 12 of reflector 10.

  Finally, the protection device 40 can comprise

  ter opaque branches 46, on both sides of the glass bulb 24 of the light source 22; these branches 46 then extend from the segment 28 in the form of a flange of the bulb holder 20, in the direction of light exit 26. The branches 46 each have an upper edge 47 over which the emitted light passes by the light source 22 which

  can thus arrive on the inner face 12 of the reflector 10.

  The upper edges 47 of the branches 46 define a line

  light / dark mite for the light beam reflected by the

  inner face 12 of the reflector 10 and leaving the projector.

  The upper edges 47 of the branches 46 are located

  at different heights to create a clear limit

  asymmetrical tee / darkness for the light beam; in other words, on the side of circulation, the light beam has a brightness / darkness limit different from that which it presents on the side corresponding to reverse traffic. The branches 46 pass close to the bulb of

  glass 24 of light source 22 to create a clear light / dark limit. The branches 46, as well as the cup 42, can be fixed as separate pieces on the support

  bulb holder 20; they can also be one with the

bulb holder 20.

Claims (7)

R E V E N D I C A T IONS   1) Headlamp for vehicle, comprising a reflector (10)   having a reflective inner face (12) with curvature   cellar and, at its top, an opening (14) receiving a bulb support (20) itself provided with a light source (22), this support being fixed to the reflector (10), characterized in that   the bulb holder (20) is provided on the inner side   bending (12) of the reflector (10).   2) Projector according to claim 1, characterized in that   the bulb holder (20) is fixed with at least one element   fixing ment (30) on the reflector (10) crossing this him from the back.   ) Projector according to claim 1 or 2, characterized in that the bulb holder (20) comes to bear against the reflector   (10) in the direction opposite to the direction of exit from lu-. mother (26).   4) Projector according to any one of claims 1 to 3,   characterized in that the reflector (10) comprises, at its reflective inner face (12), near the edge surrounding the opening (14),   a cavity (25) for the bulb holder (20).    ) Projector according to claim 4, characterized in that the bulb holder (20) is mounted in the cavity (25) with a   low transverse and longitudinal play with respect to the op axis tick (11) of the reflector (10).   6) Projector according to any one of claims 4 or   , characterized in that the bulb holder (20) has a segment (28) in the form of   tab by which this support is mounted in the cavity (25).   ) Projector according to any one of the preceding claims. teeth, characterized in that   the bulb holder (20) is a piece of injected metal and no- especially in light metal.   8) Projector according to any one of the preceding claims. teeth, characterized in that   the light source (22) is a gas discharge lamp.   9) Projector according to any one of the preceding claims.   teeth, characterized in that the bulb holder (20) comprises a screen device   (40) which partially cuts off the light emitted by the light source miner (22).    ) Projector according to claim 9, characterized in that at least one part (42, 46) of the screen device (40)   is integral with the bulb holder (20).   11) Projector according to any one of claims 9 or   , characterized in that the screen device (40) has two branches (46) opposite one another, located laterally next to the light source (22) and extending in the direction of light output ( 26), and the upper edges (46) of the branches form the light / dark limit for the light beam coming out of the projector.