DE3139943A1 - HEADLIGHTS, IN PARTICULAR HEADLIGHTS FOR MOTOR VEHICLES - Google Patents

Description

_Hi 173 53, .Π l

9/30/1981 Hk / Pi

ROBERT BOSCH GMBH, TOOO STUTTGART 1

Headlights, in particular headlights for motor vehicles

State of the art

The invention is based on a headlight for motor vehicles according to the preamble of the main claim. One of those "Known headlights have two rotationally paraboloid-shaped sectors, the sector with a larger focal length the light bundle portion is concentrated in the far area of the roadway, whereas the sector with a smaller one Focal length illuminates the near area of the road with a relatively large luminous flux.

This illumination directly in front of the vehicle is, however, less desirable, rather it becomes an even better one The aim is to illuminate the more distant road areas.

Advantages of the invention

With the headlight according to the invention, the problem presented in the prior art is essentially

173

solves that the light bundle portion illuminating the near area is raised and used for the illumination of the far area, over a relatively large width in the HH line or in the area of the light-dark border of the low beam; In addition, the road is still sufficiently illuminated when cornering. When using strongly vertically inclined diffusing screens there is the advantage that the reflector already scatters the light beam in the horizontal direction, avoiding the disadvantage that the light beam falls downwards with increasing side scattering.

Advantageous further developments of the invention are described in the subclaims. With the configuration of the headlight according to claim 2, the filament patterns of the low beam are lowered below the light / dark border. With the design of the headlamp according to claim 3 in conjunction with claim k , a maximum of the previous ear i flat advantages is achieved.

A lateral scattering of the large, weaker spiral images with simultaneous concentration of the bright,

smaller spiral images around the HV point and therefore results in a relatively broad bundle of light a further development of the headlight with the features of claim 5 or 6. Claim T indicates how the invention can be used in an expedient manner for rectangular reflectors is to be applied.

drawing

An embodiment of the invention is shown in the drawing and explained in more detail in the following description. FIG. 1 shows the rear view of a rectangular reflector on a reduced scale; and Figure 2 shows the interior

139943

. G-

view of the rectangular reflector in the direction of view II Figure 1.

Description of the embodiment

FIGS. 1 and 2 show a rectangular reflector 101 of a so-called rectangular headlight, the reflection surface of which consists of a horizontal central sector 102 and an upper and lower sector 103-10U. The central sector 102 is arranged symmetrically to the horizontal meridional section plane 105 and is part of a paraboloid of revolution with a relatively large focal length. The two sectors 103, 1 Ok are symmetrical to the vertical meridional section plane 106 and are part of an envelope whose vertical section is a parabola and whose horizontal section is an ellipse. Both sectors 103, 10Ϊ + delimit a section 107 parallel to the horizontal meridional section plane 105. The central sector 102 and both sectors 103, 101) connect flat surfaces 108 which are arranged radially with respect to the optical axis 109 of the reflector 101. In the apex region of the reflector 101, an opening 110 is cut out for receiving an incandescent lamp (not shown) with a luminous element for generating a light beam.

The intersection curves resulting from the intersection of planes perpendicular to the axis 109 of the reflector 101 with the reflection surface of the upper and lower sectors 103, 10U are elliptical segments whose semi-axes are perpendicular to the axis 109 of the reflector and a semi-axis of the ellipse lies in the horizontal center plane.

The left and right halves of the top and bottom. Sector 103, 10U by the intersection of the upper and lower sectors arise with the vertical meridional section plane 106,

• © β β β

ι · «β a et αβ

-.173-59

are slightly unfolded about that axis 111 which is arranged at right angles to the horizontal meridional section plane 105 and goes through the reflector vertex (z-axis). If, on the other hand, the horizontal meridional section of the envelope is a hyperbola, the left and right halves of the upper and lower sectors 103, 10 ¹ +, which arise from the intersection of both sectors with the vertical meridional section plane 106, are slightly folded over one another about the axis 111 which is arranged at right angles to the horizontal meridional section plane 105 and goes through the reflector vertex (z-axis).

Blank page

Claims (1)

R. ' 30.9.1-981 Hk / Pi ROBERT BOSCH GMBH, 7000 STUTTGART 1 Expectations ff ⁵ =!). / " ³ ^ f 1J headlights, in particular headlights for motor vehicles with a reflector, the reflection surface of which has several sectors of different focal lengths and the sectors echo approximately the same focal point, and with a luminous element for generating a light beam, characterized by: a) a horizontal central sector (102) is part of a paraboloid of revolution, b) an upper and a lower sector (i03 - 101+) are part of an envelope whose vertical section is a parabola and whose horizontal section is a curve _{similar to a conic section,} c) the focal length of the vertical section parabola and that of the conic-like curve of the upper and lower Sector (103, 10 ^) are smaller than the focal length of the horizontal middle sector (102). 2. Headlight according to claim 1, characterized by: d) With respect to the reflector axis (109) is the parabolic axis of the upper sector (103) inclined downwards by approximately 2 degrees and the parabolic axis of the lower. Sector (1O |) inclined upwards by approximately 2 degrees - 3. Headlight according to claim 1 or 2, characterized by: e) is the horizontal section of the envelope of the upper and lower sectors (103, 10 * 0 of the reflector (101) a conic section line, in particular an ellipse. k. Headlight according to claim 3 _S characterized by: f) the intersection curves resulting from the intersection of planes perpendicular to the axis (109) of the reflector (101) with the reflection surface of the upper and lower sectors (1O3 ₉ 10U) are elliptical segments, the semiaxes of which are perpendicular to the axis (109) of the Reflector (101) Btehen, a semiaxis lying in the horizontal meridional section plane (105). 5. Headlight according to claim 3 or h _t characterized by: g) the left and right halves of the upper and lower sectors (103, 10 * 0, obtained by the intersection of both Sectors with the vertical meridional section plane (1O6) are created around the axis (111) O · © ο ο ο β α * ° β β 0 D Βββ a O _{βα βββ} .17 3 5 9 ' opened slightly, the right-angled to the horizontal Meridional section plane (105) is arranged and goes through the reflector vertex '(z-axis). 6 ". Headlight according to Claim 1 or 2, characterized through this: h) the horizontal section of the envelope is a hyperbola, i) the left and right halves of the upper and lower sectors (103, 10 * 0, obtained by the intersection of both Sectors with the vertical meridional section plane (1O6) arise, are slightly around that axis (T11) Folded one on top of the other, which are arranged at right angles to the horizontal meridional section plane (105) is and goes through the reflector. vertex (z-axis). T. In particular headlights, the reflector of which is a so-called rectangular reflector with two sections parallel to the horizontal central _{element, characterized by: j) one section (107) each delimits the upper and lower sectors (1O3 5} 10U), k) the horizontal central sector (102) and the upper or lower sector (1O3 _S 10U) connect flat surfaces (108) which are arranged radially with respect to the optical axis (109) of the reflector (101).