GB2097111A - Marker light - Google Patents

Marker light Download PDF

Info

Publication number
GB2097111A
GB2097111A GB8211632A GB8211632A GB2097111A GB 2097111 A GB2097111 A GB 2097111A GB 8211632 A GB8211632 A GB 8211632A GB 8211632 A GB8211632 A GB 8211632A GB 2097111 A GB2097111 A GB 2097111A
Authority
GB
United Kingdom
Prior art keywords
lens
light
segments
housing
marker
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB8211632A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Electric Equipment Corp
Original Assignee
Toshiba Electric Equipment Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Electric Equipment Corp filed Critical Toshiba Electric Equipment Corp
Publication of GB2097111A publication Critical patent/GB2097111A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
    • B64F1/00—Ground or aircraft-carrier-deck installations
    • B64F1/18—Visual or acoustic landing aids
    • B64F1/20—Arrangement of optical beacons
    • B64F1/205—Arrangement of optical beacons arranged underground, e.g. underground runway lighting units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
    • B64F1/00—Ground or aircraft-carrier-deck installations
    • B64F1/18—Visual or acoustic landing aids
    • B64F1/20—Arrangement of optical beacons
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
    • E01F9/50—Road surface markings; Kerbs or road edgings, specially adapted for alerting road users
    • E01F9/553—Low discrete bodies, e.g. marking blocks, studs or flexible vehicle-striking members
    • E01F9/559—Low discrete bodies, e.g. marking blocks, studs or flexible vehicle-striking members illuminated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2111/00—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00
    • F21W2111/06—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00 for aircraft runways or the like

Abstract

A marker light comprising a housing (1) provided with light projecting windows (5), a light source (6) arranged inside the housing (1) and optically facing light projecting windows (5), and a light control member (7) arranged inside the housing (1) and provided with a lens section (8) optically facing light projecting windows (5), said lens section (8) comprising a plurality of lens segments formed continuous from one another, wherein each of lens segments is formed in the lens section (8) to have a different angle of refraction in such a way that beam lights radiated outside through adjacent lens segments are slightly superposed with one another at outer edges thereof to form a single composite intensity distribution. <IMAGE>

Description

SPECIFICATION Marker light The present invention relates to an improvement of a marker light.
Each of marker lights which are arranged and used as guide lights on the taxiway in airport, for example, is designed to project its light beam in two predetermined directions using lens only. The marker light of this type is needed to meet the intensity distribution regulation under a certain luminous intensity level. The regulation provided by the Internation Civil Aviation Organization (which will be hereinafter referred to as ICAO) asks each of marker lights of the taxiway line lights center on curved section to have a lowest average luminous intensity of 50cd and a main beam higher than 25cd in a range of horizontal angle +20 and vertical angle 095" in the case of green color light.
As disclosed by British Patent 1,099,636, for example, conventional marker light of this type has a lens opposite to the light projecting window in the ring of glass. It has been found, however, that this conventional marker light can not satisfy the regulation of intensity distribution because of its single curved lens. This marker light will be able to satisfy the regulation of intensity distribution when a light source of higher output is employed or its housing is made larger in size to project its light beam more widely, but a limit exists in the attempt of making the output of light source higher and the size of housing larger, and an intensity distribution satisfactory enough can not be achieved accordingly.
The object of the present invention is to provide a marker light having a smaller-sized housing and a light source of smaller power consumption, and capable of satisfying the regulation of intensity distribution enough.
The object of the present invention can be achieved by a marker light comprising a housing provided with light projecting windows, a light source optically arranged opposite to light projecting windows, and a light control member having a lens section optically arranged opposite to light projecting windows, said lens section comprising a plurality of lens segments juxtaposed to one another, wherein each of lens segments is formed to have a different angle of refraction in such a way that beam lights emitted outside through adjacent lens segments are slightly superposed with one another at outer edges thereof to form a single composite distribution of intensity.
This invention can be more fully understood from the following detailed description when taken in conjunction with the accompanying drawings, in which: Fig. 1 is a plane view showing an example of marker light according to the present invention; Fig. 2 is a sectional view taken along the line ll-ll in Fig. 1; Fig. 3 is a plane view showing the enlarged main portion of a light control member shown in Fig. 1; Fig. 4 is a view showing the pattern of intensity distribution of each of lens segments employed in the marker light according to the present invention; Fig. 5 is a view for comparing the intensity distribution regulated with that achieved by the marker light according to the present invention; and Figs. 6 and 7 are plane views showing enlarged main portions of other examples of light control member.
An example of marker light according to the present invention will be described referring to the drawings.
In Figs. 1 and 2, numeral 1 represents a housing formed as a unit having a lower cylindrical cover 2 and an upper disc-like cover 3, and detachably attached to a seating base 4 embedded in the ground. Numeral 5 denotes light projecting windows provided in the upper cover 3 and arranged opposite to each other to project light in two substantially reverse directions in the case of this embodiment.
Numeral 6 denotes a light source such as halogen lamp optically arranged opposite to light projecting windows 5 in the housing 1. The light source 6 is erected in the center of housing 1 in this embodiment. Numeral 7 denotes a ring-shaped light control member made of light transmitting material such as glass, for example, and arranged inside the housing 1 having a lens section 8 at the inner circumference thereof, said lens section 8 being optically arranged opposite to light projecting windows. As shown in Fig. 3, the lens section 8 of light control member 7 has a series of convex lens segments 10, 11 and 12.
Namely, the lens section 8 comprises the first lens segment 10 positioned in the center thereof, second paired lens segments 1 1 and 11 symmetrically formed on both sides of first lens segment 10, and third lens segments 12 and 12 symmetrically formed outside second lens segments, respectively. Each of lens segments 10, 11 and 12 in the lens section 8 is formed to have an angle of refraction different from those of other lens segments in such a way that beam lights emitted outside through adjacent lens segments are slightly superposed with one another at outer edges thereof to form a single composite distribution of intensity.Beam light in this case means a light emitted through each of lens segments and having a level of intensity, which is about one-fourth or more of the maximum intensity thereof, and these lights having such level of intensity and emitted through adjacent lens segments are slightly superposed with one another at outer edges thereof. Namely, a first beam light is radiated through the first lens segment 10 to pass through the light projecting windows 5, second beam lights are radiated on both sides of first beam light through a pair of second lens segments 11 and 11, and third beam lights are radiated outside second beam lights through a pair of third lens segments 12 and 12, so that beam lights radiated through adjacent lens segments and having the level of intensity, which is about one-fourth or more of the maximum intensity thereof may be superposed with one another.Num eral 13 in Fig. 2 represents a color filter, which is green, for example, and arranged between the light control member7 and light source 6.
The marker light having such arrangement as described above W25 turned on and tested. As shown in Fig. 4, the pattern of intensity distribution radiated through the first lens segment 10 is as shown by A, patterns of intensity distribution radiated through second lens segments 11 and 11 are as shown by B and B', and patterns of intensity distribution radiated through third lens segments are as shown by C and C', wherein beam lights radiated through adjacent lens segments and having the level of intensity, which is about one-fourth or more of the maximum intensity thereof are slightly superposed with one another at outer edges thereof. It has been found that an intensity distribution D which is composed by these intensity distribution patterns A, B, B', C and C' can satisfy the regulation of ICAO enough as shewn in Fig. 5.In addition, the lens section 8 comprising a plurality of lens segments continuous from one another allows the light control member 7 to be smaller-sized and also the housing 1 to be made smaller in size accordingly.
Although the present invention has been described referring to the embodiment having such arrangement as described above, it should be understood that the present invention is not limited to such embodiment. The lens section 8, for example, may be provided with a first lens segment 10 and a pair of second lens segments 11 and 11 symmetrically formed on both sides of first lens segment 10, as shown in Fig. 6, or the lens section 8 may be formed to have plural pairs of lens segments sym metrically formed, as shown in Fig. 7. Same parts as those in the above-described embodiment are represented by same reference numerals in Figs. 6 and 7 and description on these parts will be omitted. The lens section 8 may also be provided with a pair of symmetrically formed lens segments. The light control member 7 may not be ring-shaped.

Claims (6)

1. A marker light comprising a housing provided with light projecting windows, a light source arranged inside the housing and optically facing the light projecting windows, and a light control member arranged inside the housing and provided with a lens section optically facing the light project ing windows, said lens section comprising a plurality of lens segments formed continuous from one another, wherein each of lens segments is formed in the lens section to have a different angle of refraction in such a way that beam lights radiated outside through adjacent lens segments are slightly superposed with one another at the outer edges thereof to form a single composite intensity distribution.
2. A marker light according to claim 1, wherein said light control member is made of a ring-shaped light transmitting material and said lens section is formed at the inner circumference of said light control member.
3. A marker light according to claim 1 or 2, wherein said lens section is provided with a first lens segment positioned in the center thereof, and a pair of second lens segments symmetrically formed on both sides of said first lens segment.
4. A marker light according to claim 1 or 2, wherein said lens section is provided with plural pairs of lens segments, said paired lens segments being formed symmetrical to each other
5. A marker light according to claim 1, wherein said light projecting windows are arranged in two directions, respectively.
6. A marker light substantially as hereinbefore described with reference to the accompanying drawings. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
GB8211632A 1981-04-22 1982-04-22 Marker light Withdrawn GB2097111A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56061036A JPS57174508A (en) 1981-04-22 1981-04-22 Marking lamp

Publications (1)

Publication Number Publication Date
GB2097111A true GB2097111A (en) 1982-10-27

Family

ID=13159646

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8211632A Withdrawn GB2097111A (en) 1981-04-22 1982-04-22 Marker light

Country Status (3)

Country Link
JP (1) JPS57174508A (en)
BE (1) BE892935A (en)
GB (1) GB2097111A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0210503A1 (en) * 1985-07-23 1987-02-04 Minnesota Mining And Manufacturing Company Luminous horizontal roadway marking strips
DE4008932A1 (en) * 1990-03-20 1991-09-26 Siemens Ag Modular lighting recessed into airport runways - has circular bases with independent light modules for directional beam

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008311207A (en) * 2007-05-14 2008-12-25 Toshiba Lighting & Technology Corp Embedded marker lamp

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0210503A1 (en) * 1985-07-23 1987-02-04 Minnesota Mining And Manufacturing Company Luminous horizontal roadway marking strips
EP0422696A2 (en) * 1985-07-23 1991-04-17 Minnesota Mining And Manufacturing Company Luminous horizontal roadway marking strips, and method and devices for forming such luminous horizontal roadway markings
EP0422696A3 (en) * 1985-07-23 1992-03-04 Minnesota Mining And Manufacturing Company Luminous horizontal roadway marking strips, and method and devices for forming such luminous horizontal roadway markings
DE4008932A1 (en) * 1990-03-20 1991-09-26 Siemens Ag Modular lighting recessed into airport runways - has circular bases with independent light modules for directional beam

Also Published As

Publication number Publication date
JPS57174508A (en) 1982-10-27
BE892935A (en) 1982-08-16

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)