# US 6,739,741 B2 · Display device by columnar light

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- Number: US 6,739,741 B2
- Document ID: US6739741B2
- Status: Granted
- Kind: B2
- Application number: 10/255,001
- Filed: 2002-09-26
- Published: 2004-04-01
- Granted: 2004-05-25
- Earliest claimed: 2002-09-26
- Assignees: APT, Inc.
- Inventors: Yoshihiko Awa
- Web page: https://patentgrep.com/patent/US6739741B2

## CPC

- G08G 1/095: Traffic lights
- G08G: TRAFFIC CONTROL SYSTEMS (guiding railway traffic, ensuring the safety of railway traffic B61L; arrangement of road signs or traffic signals E01F9/00; radar or analogous systems, sonar systems, lidar systems specially adapted for traffic control G01S13/91, G01S15/88, G01S17/88; {radar or analogous systems, sonar systems, lidar systems specially adapted for anti-collision purposes G01S13/93, G01S15/93, G01S17/93})

## Abstract

A display system comprising a high-intensity discharge lamp system equipped with a stabilizer, a reflector mirror coated with a heat-absorption film, a shutter, and a light-gathering lens; and a pole holding the high-intensity discharge lamp system at a desired height above the road or its vicinity. The display system of the invention enables drivers to easily see and locate the centerline, road shoulder, crosswalk, and traffic signs, even in the midst of rainstorm, dense fog, or blizzard.

## Claims

### Claim 1

A display device using columnar light comprising:
a high-intensity discharge lamp system equipped with a stabilizer, a reflector mirror coated with a heat-absorption film, a shutter, and a light-gathering lens; and
a pole holding the high-intensity discharge lamp at a desired height above the road or its vicinity,
wherein the shutter is placed at the primary focal point of the high-intensity discharge lamp, and the light choked by the shutter is gathered by the lens to illuminate the road or its vicinity.

### Claim 2 (depends on 1)

The display device according to claim 1, wherein the light intensity in the center of the high-intensity discharge lamp is between 50,000 and 1,000,000 candela (cd).

### Claim 3 (depends on 1)

The display device according to claim 1, wherein the high-intensity discharge lamp is equipped with a stabilizer, a reflector mirror coated with a heat-absorption film, a shutter, a high-gathering lens, a sensor sensitive to light intensity or weather conditions, and an On/Off switch driven manually or by said sensor.

### Claim 4 (depends on 1)

The display device according to claim 1, wherein a plurality of poles each equipped with a high-intensity discharge lamp are installed at appropriate intervals in pairs facing each other within a predetermined area including the road shoulder, and the reach of the resulting light is limited by directing light from each high-intensity discharge lamp to the lamp opposite.

### Claim 5 (depends on 2)

The display device according to claim 2, wherein the high-intensity discharge lamp is equipped with a stabilizer, a reflector mirror coated with a heat-absorption film, a shutter, a light-gathering lens, a sensor sensitive to light intensity or weather conditions, and an On/Off switch driven manually or by said sensor.

### Claim 6 (depends on 2)

The display device according to claim 2, wherein a plurality of poles each equipped with a high-intensity discharge lamp are installed at appropriate intervals in pairs facing each other within a predetermined area including the road shoulder, and the reach of the resulting light is limited by directing light from each high-intensity discharge lamp to the lamp opposite.

### Claim 7 (depends on 3)

The display device according to claim 3, wherein a plurality of poles each equipped with a high-intensity discharge lamp are installed at appropriate intervals in pairs facing each other within a predetermined area including the road shoulder, and the reach of the resulting light is limited by directing light from each high-intensity discharge lamp to the lamp opposite.

### Claim 8 (depends on 5)

The display device according to claim 5, wherein a plurality of poles each equipped with a high-intensity discharge lamp are installed at appropriate intervals pairs facing each other within a predetermined area including the road shoulder, and the reach of the resulting light is limited by directing light from each high-intensity discharge lamp to the lamp opposite.