DE1721559U - DIMMABLE MOTOR VEHICLE LAMP. - Google Patents

Description

63c, 63/20. 1 72! 559. Robert Bosch "~ Siutt" 2rt-W. ! Dimmable

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9. 55.

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To September 1955
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ROBERT BOSCH GMBH, Stuttgart-W, Breitsoheidstr,

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Dimmable vehicle headlight

Ma Nauetimng 'refers to a motor vehicle headlight with at least one screen arranged at least approximately concentrically to the axis of a p & rabolischon concave mirror to intercept the light rays emerging from aea filamentous filaments directly upwards and after the seldom emerging light rays and with a two-wire incandescent lamp, whose focal point is a parabolic concave mirror arranged main thread the far beam and its located in front of the focal point

the low beam delivers. The known types of radiators shield the rays, which are particularly disturbing in the case of levers and haze, but they also swallow a considerable proportion of the usable light emitted. However, this measure was unsuccessful , since a large auxiliary mirror suitable for this purpose, which also acts as a beam, intercepts a considerable part of the light reflected by the headlight cavity.

Liix-ch dis crouching is done with a headlight of the type mentioned ai-u particularly simple and expedient way to reduce the risk of dazzling üttuöiöigtf without a noticeable loss of light »·

■ - 2 -

• G.m.b.H., Stuttgart-W. | Dimmable

Automotive headlights. 2. 9. 55.

Robert Bosch GmbH - 2 - R 23 056. (T. 5-, z. I)

3, Ml 135s

Stuttgart I: io9 »lS55 fd / Üi

■ innovation consists in _r daß''die effective _{Schiraifläehe;} .on a truncated cone deficiency, the uppermost mantle earth after

; ' is inclined downwards at least approximately at the same angle »as

■ \ the upper rays of the dipped beam reflected by the concave mirror

\\ light. When using such a glare shield, even

i-: the previously used as an additional shielding means in front of the; incandescent lamp asga-

Y ordered the dipping spoon to be dropped, then the one from the light opening

S of the Abblendschiraea still directly from the light bulb below

\ interferes with light emitted flat upwards at an acute angle

j not even in fog »These light beams become more swacky ™

wise through sin with strongly scattering optical meansInV / in particular

j central field of the translucent one with scattered corrugations

| <The diffuser is distributed in such a way that it shows the outside above the chiaroscuro «

S, brighten the border slightly and therefore a certain amount when driving

<Convey a feeling of security »

The effective surface of the end screen is expedient with a matt black coating that prevents the occurrence of light reflections * The. Umbrella can also consist of one limited translucent material exist, the .only the 'special disturbing parts of the light entering it swallowed dia on the other hand, lets through remaining rays that are no longer disturbing «Da in usually only the rays of light directed obliquely upwards are undesirable, only needs a partial area, for example over the upper half of the circumference extending Truncated cone segment above the horizontal central borio of the Headlights to be arranged »

The drawing shows an embodiment in three figures of the innovation item in each case in vertical Hittalsohnitt.

In the first example according to Fig. 1 is in the Brena point part parabolic concave mirror 5 of the high beam filament δ airier two filament lamp, the second filament 8 in front of the focal point of the Concave mirror lies. Below the 'filament 8 is a small :: - Bmlaenföralgar Schira 7 arranged in a known manner, DIs

63c, 63/20. i 72i 559. Robert Bosch GmbH, Stuttgart-W. | Dimmable motor vehicle headlights. 2. 9. 55. B 23036. (T. 5; line 1)

3rd Ma;

Robert Bosch GmbH Stuttgart

./Ho -

636 '

.1955

Is the outlet opening of the EonX j? Tegels is covered by a mat sckwaoh 'light-scattering corrugation provided translucent window pane 9, the middle field 10 of which is more .scattering corrugations must be. By means of a narrow web 11 is EIA on the hollow mirror as AVolenc.- schirin serving truncated cone 12 coaxially ZXM concave mirror and lying mounted in front of the bulb "The uppermost generating line of this screen runs approximately parallel to the light reflected from the upper concave mirror = hälfts beam a of Abblendglüafadens The Scüiasn fefc designed and arranged so that the upper half of the mirror is still fully illuminated; & oh "its facing front edge just barely allows the light beam directed towards the uppermost point & es £ ohl apiegelD b to pass."

If it proves necessary _? aas light from the Ferruichtf steeply downgoing direct 'aoüsuschstten completely, directly to a au strong whitening of the roadway. "pre dam. the Schiria 15 illustrated in ^ ¹ Ig" 2 "prevent vehicle can verwamst

v; erdonc This differs from the first A-asführmigsfoi-m in that its front edge facing the incandescent lamp touches the light beam c 'and that part of the measure eleven laughs on the upper side is cut out so that the cutting edge touches the beam b.

A particularly effective design, which is also not noticeable

Figure 3 shows that in this embodiment, two are concentric to one another and to the central axis. Sections 16 and 17 so aia web 11 "is attached _{9 so} that only the rays of light that are radiated from the unraveled, unrestricted barrels catch 'wards', but the reflected light is almost completely exploited _or above the horizontal center line lying vvirksama ffläohe des 3chirme3 17 belonging "!; a Eegelstunxpf coat, the upper to biantellinie has about the same inclination as the frequent reflected by the hobl "mirror" rays of the low beam83, X »the lower half © of the Schinaee 17, on the other hand, lies on a cylinder jacket * ■ desoin / paränSS towards the Kolilspiegelaohse of the lower half of the hollow spxegöl- ro'flektiarten Ji'oi'nlichtstrablen ver

63c, 65/20. 1721559. Robert ßosch G.m.b.H., Stuttgart-W. | Dimmable " Automotive headlights. 2. 9. 55. B 25 036. (T. 5; line 1)

Robert Bosch GMBH Stuttgart

4.-

'■ f

364

.1955

IZ / '& i

the visor 12 in Figo 1 or 15 in Pig, 2 can this s'orm be given.

That the lower ropes of the Abbland screens may be dispensable are, i.e. that in many cases it is already sufficient, above the horizontal mid-plane bleading screens in fora of truncated cone segments to be arranged in the concave mirror »has already been mentioned.»

Claims (2)

Ι »Dimmable motor vehicle headlight with at least one at least approximately concentric, on the axis '' of a parabolic concave mirror arranged screen to intercept the ·. -Upwards and. rays of light emerging to the sides and with a two-fade incandescent lamp ^! which is arranged in the focal point of the concave mirror main filament, the high beam and the befindlicher before Bremiptuikt secondary filament provides the low beam, characterized ₉ that the effective screen area is geleenhzeiehnot on a frustoconical coat, dasBen uppermost generatrix to is down at least approximately genigt in the same angle as the upper Dipped beam rays reflected by concave mirrors. 2. Headlight according to claim 1, dadui'ch marked _? that the screen is ring-shaped and its above the horizontal *! Effective area lying in the center line of the stump of the sail, but the area below it belonged to a cylinder jacket Headlight according to Claim 1 or 2, characterized., that two screens are at least approximately concentric to the, concave mirror The axis is arranged within the concave mirror in the beam path of the light emanating directly from the light threads 4 ·. Headlight according to one of Claims 1 to 5 »characterized in that that the top of the screen faces the incandescent lamp. iand is cut out »