9.4% 6.4-8-476Zzys
Total Page:16
File Type:pdf, Size:1020Kb
& U. " a O ... if ?: CROSS REFERENCE C s 2 / 2 re 2. June 8, 1965 BUNSAKU SHIOM 3,188,519 AUTOMATIC CONTROL SYSTEM FOR HEADiGHis OF MOTOR WEHICLES COMPRISING A SUPPLEMENTARY LIGHT WITH FILTER Filed Oct. 13, 1559 2 Sheets-Sheet l - . AF/6 / DRIVERS vehicle ON-COMING vehicle PHOTOTRANSISTOR PHOTOTRANssTOR /7 /7 3LOWBEAM 2HGHBEAM AMP LAMP AMP 13 Loy. AM 4SUPPMENARY 4SUPPLEMENTARY LAMP AMPFER A/G 3 1OO 8 O 6 O 4OO 6OO 900 /OOO WAVE LAWGTH (MICAOW) INVENTOR. BUNSAYU SHIOM t 9.4% 6.4-8-476ZZys. June 8, 1965 BUNSAKU SHIOM 3,188,519 AUTOMATIC CONTROL SYSTEM FOR HEADLIGHTS OF MOTOR WEHICLES COMPRISING A SUPPLEMENTARY LIGHT WITH FILTER Filed Oct. 13, 1959 2 Sheets-Sheet 2 2/HEGHBEAM HEADLIGHT 22 LOW BAM HEADI supplementary AP-6 GHT PHOTOcell O 6 O2 ola. V r- -- 4OOO 5OOO 6OOO ZOOO &OOO 9000 (OOOO IOOO 12OOO 130OO WAVE LENGTH (4) INVENTOR. 6UWSAKU SHIOMI BY /2Zy 3,188,519 United States Patent Office Patented June 8, 1965 1. 2 3,188,519 Therefore, it is impossible that the shortage of light en AUTOMATIC CONTROL SYSTEM FOR HEAD ergy caused by the switching-off or dimming of the head LIGHTS OF MOTORVEHICLES COMPRISING lights be supplemented at the instant if the supplementary A SUPPLEMENTARY LIGHT WITH FILTER lights be switched on simultaneously with the switching Bunsaku Shiomi, Tokyo, Japan, assignor to Tokuji off or dimming of the headlights. Kikuyama, Nagoya-shi, Japan According to the present invention, there is provided Filed Oct. 13, 1959, Ser. No. 846,149 Claims priority, application Japan, Nov. 11, 1958, an automatic control system for headlights of an auto 33/32,030 mobile in which the main headlights thereof are auto 4 Claims. (C. 315-83) matically switched off or dimmed only when auxiliary 10 headlights and supplementary lights, being switched on The present invention relates to an automatic control before the main headlights are operated, have obtained a system for headlights of a motor vehicle. sufficient luminous intensity. In driving at night, when motor vehicles running in In the control system in accordance with this inven opposite directions pass each other, it is a common prac tion, a lightsensitive device such as a phototransistor or tice for the driver to dim or switch of the headlight or 5 a photocell is employed as a means for receiving light headlights of the vehicle driven by him to keep other from the headlamps on an on-coming vehicle or light drivers of the on-coming vehicles from being dazzled or from its auxiliary headlights of (lower candle-power) and blinded for the purpose of preventing traffic accidents. supplementary lights. When the lightsensitive device re Need for such operation has increased in recent years ceives such light, it generates an electric power output, because of the marked rise of the running speed of motor 20 which is amplified to operate a lamp switching means. vehicles. On the other hand, such switching-off or dim As described above, in the control system of this in ming operation, especially on highways having heavy traf vention, auxiliary headlights and supplementary lights are fic, is troublesome for the driver, and in fact is not car turned on while the main headlights are switched off or ried out at all times rigidly. Under such situations, it dimmed, said supplementary lights forming each a source has already been suggested to provide a control System 25 of invisible light such as an infrared lamp or a source in which the headlight or headlights of a motor vehicle of visible light such as a violet, blue, or green light lamp. are automatically dimmed or switched off by the action In any way, as a light source for use in Such supple of a light beam coming from the on-coming vehicle. mentary lights, an ordinary incandescent lamp is much However, in such automatic control system, some Sup advantageous in actual use. Thus, in the control system plementary source of light is required for meeting the 30 of this invention, an incandescent lamp is preferably em shortage of brightness and luminous flux of the head ployed in combination with a suitable photofilter in the lights due to dimming. The reason for this is that, with form of a film of gelatine or other organic material col out any such supplementary light sources, the headlights ored blue or green. being dimmed under the action of light from the on The photofilter comprising an organic film has in gen coming vehicle may not be effective to operate the head 35 eral a very good transparency or penetration coefficient light control system thereof, which means that it be im with respect to infrared rays. Thus, it is preferred that possible to automatically control the headlights of both Supplementary lights each comprising an incandescent vehicles passing each other in opposing directions with lamp are used with a blue-colored organic filter disposed out failure by the use of a control system of such kind. in front thereof for the purpose of projecting blue light Accordingly, it is important that such automatic control 40 and infrared light without giving rise to glare or dazzling system operates to dim the headlights on the vehicle by effect and discomfort on drivers. light from an on-coming vehicle while at the same time An object of the present invention is to provide an projecting to the on-coming vehicle an amount of Sup automatic control system for headlights of a motor ve plementary light energy correspondingly to the decrease hicle which comprises a main headlight or headlights, in light energy emitted by the headlights. Further, in 45 a Supplementary light or lights, a lightsensitive device this case, such supplementary light beam or beams are and means adapted to be controlled by the output of not permitted to dazzle the driver of the on-coming ve said lightsensitive device so as to dim or switch off said hicle, but are required to make up for the decrease in main headlights while switching on said supplementary luminous intensity of the headlights on the vehicle pro lights which project light through a filter made of an vided with a source of such suplementary light energy. 50 As a source of the above described supplementary organic material. light energy, any light beam may be selected such as A further object of the present invention is to pro invisible rays, say, infrared rays or red, violet or other vide an automatic control system for headlights of a visible light rays. According to the present invention, motor vehicle comprising a main headlight or headlights, therefore, there is provided an automatic switching sys 55 a supplementary light or lights and a lightsensitive de tem comprising a high candlepower electric lamp con vice, which is adapted to be controlled by said lightsen stituting a light source of a main headlight, a low candle sitive device so as to switch on said supplementary lights power electric lamp, and a supplementary light such as and subsequently switch off said main headlights. an infrared electric lamp, these electric lamps being ar Other object, features and advantages of the present ranged such that they may be switched over automati 60 invention will become apparent from the following de cally by the action of light coming from the headlights scription when read with reference to the accompanying of passing vehicles. As stated above, this automatic drawings illustrating embodiments of the present inven switching system employs a supplementary light or lights tion. having no dazzling effect on on-coming drivers so that In the drawings: even when dimmed the system may not make similar 65 FIGURE 1 is a wiring diagram of an automatic con devices on the on-coming vehicles inoperative. The sup trol system for headlights of a motor vehicle embodying plementary lights may each form a source of invisible the present invention, showing a pair of symmetrically light such as infrared or visible light such as violet, identical parts of the system, one part being on the driver's blue or red. It is known that when an electric lamp is vehicle and the other being on the on-coming vehicle; turned on, the luminous intensity of its filament rises to 70 FIGURE 2 is a wiring diagram of another embodiment its steady value only after a substantial length of time. of the present invention adapted to switch of the main 3,188,519 3 4. headlights after the auxiliary headlights and the supple beam headlight 21, a low beam headlight 22, a supple mentary lights have been switched on; mentary light 23 and a photocell 24. The photocell 24 FIGURE 3 is a graphical representation of a character is connected to an amplifier 25 as shown so that the istic of a filter employed in the invention and comprising power output of said photocell is amplified by the ampli a film of organic material, showing penetrating power fier 25 to be fed to the solenoid coil 28 of a relay 26. in percentage plotted against wave lengths; The relay 26 has a stationary contact 27 connected FIGURE 4 is a graphical representation of respective to one polarity of an electric source 29 and a movable characteristics of a number of photocells utilizable with contact 30 connected through a solenoid coil 32 of a the filter in accordance with the present invention; and Second relay 31 to the other polarity of the electric source FIGURE 5 is a sectional view of a supplementary lamp O 29. The second relay 31 comprises two stationary con device having a filter according to the present invention.