CN105570701A - Luminous intensity standard lamp with LED filaments - Google Patents
Luminous intensity standard lamp with LED filaments Download PDFInfo
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- CN105570701A CN105570701A CN201610113751.3A CN201610113751A CN105570701A CN 105570701 A CN105570701 A CN 105570701A CN 201610113751 A CN201610113751 A CN 201610113751A CN 105570701 A CN105570701 A CN 105570701A
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- lamp
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- led silk
- luminous intensity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V19/00—Fastening of light sources or lamp holders
- F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V15/00—Protecting lighting devices from damage
- F21V15/02—Cages
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- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
Provided is a luminous intensity standard lamp with LED filaments. The luminous intensity standard lamp with the LED filaments comprises a lamp holder and a lamp housing, wherein a glass stem, a filament support and the LED filaments are arranged in the lamp housing; the lamp housing is sealed and filled with heat-dissipating protective gas; the filament support is fixed on the glass stem; two guide wires are led out from the inside of the glass stem and are a positive pole connecting wire and a negative pole connecting wire respectively; the positive pole connecting wire and the negative pole connecting wire are respectively connected to two poles of the lamp holder; the LED filaments are fixed on the filament support, and are arrayed in a plane in the lamp housing in parallel in an evenly spaced manner; the center of the plane is consistent to the center of the lamp housing; the surface of the lamp housing is blackened and a diaphanous window is formed in the surface of the lamp housing; the diaphanous window is positioned in the center of the blackened surface; and the center of the diaphanous window is consistent to the center of the plane of the LED filaments. The luminous intensity standard lamp with the LED filaments is simple in structure, easy to mount and adjust, good in horizontal and vertical angle characteristic and uniform in illumination field distribution, and has the advantages of good stability, vibration resistance, high yield and low cost; and measurement result uncertainty caused by spectral mismatch can be reduced remarkably.
Description
Technical field
The invention belongs to optical radiation measurement field, relate to a kind of LED silk luminous intensity standard lamp, particularly relate to one and can meet the LED silk luminous intensity standard lamp that illuminator is the photometric parameter measurement of light emitting diode (LED) light source.
Background technology
Luminous intensity standard lamp is the standard metrology appliance preserving and transmit unit of luminous intensity's value.Unit of luminous intensity's candela (cd) is one of SI seven base units, and all the other light units are as lm (lumen), lx (unit of illuminance), cd/m
2(brill) is all derived by unit of luminous intensity.Traditional luminous intensity standard lamp is incandescent lamp, its illuminator is arranged to plane, on measurement plane, intensity of illumination distribution is even, by the design of lamp housing shape, surperficial blacking or additional diaphragm, make every effort to avoid or reduce veiling glare, make it have good horizontal and vertical angular characteristics and excellent value repeatability, the starting point of measuring position is the front surface of filament.
Traditional incandescent strength criterion lamp is due to complex manufacturing technology, and price is high, the luminous intensity standard lamp partial outage of some reputable brands, is difficult at present obtain from commercial channels.LED has significant energy-saving effect, along with the continuous reduction of price, is the principal item of alternative conventional light source.Existing light quantity value transmit system is based on incandescent standard lamp, but the spectral power distribution of LED is different from incandescent source, when directly measuring LED light source with incandescent standard lamp, the deviation of the measurement result caused due to spectral mismatch error, even up to 30%, can not meet the needs of LED industry development.Given this, optical radiation measurement field is the luminous intensity standard lamp of LED in the urgent need to illuminator, to improve the degree of accuracy that LED measures, and can solve the present situation of incandescent strength criterion lamp shortage.
LED silk light fixture has good value repeatability, and preheating time is only 8-12min, makes the making of the LED silk luminous intensity standard lamp taking LED as illuminator become possibility by rational filament layout and heat dissipation design.For meeting the demand that optical radiation measurement field is LED luminous intensity standard lamp to illuminator, the invention provides a kind of LED silk luminous intensity standard lamp being illuminator with LED silk, good stability, manufacture craft is simple, yield rate is high, cost is low, and service life is much larger than traditional incandescent standard lamp; When direct use LED silk of the present invention luminous intensity standard lamp calibrating illumination photometer and the luminance meter for measuring LED light source, not needing to carry out spectral mismatch correction, simplifying data handling procedure.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, provide the LED silk luminous intensity standard lamp that a kind of LED silk is illuminator, good stability, service life is much larger than traditional incandescent standard lamp.
A kind of LED silk luminous intensity standard lamp, comprising: lamp holder and lamp housing, be provided with glass stem, filament support, LED silk in lamp housing, lamp housing seals and is filled with heat radiation protection gas; Described filament support is fixed on glass stem, and draw two seal wires in glass stem and be respectively positive pole line and negative pole line, positive pole line is connected with the two poles of the earth of lamp holder respectively with negative pole line; Described LED silk is fixed on filament support, at equal intervals the YZ plane of parallel arrangement in lamp housing, and in square or rectangular, planar central is arranged in lamp housing in the heart; Described LED silk and the projection of filament support vertical portion in XZ plane do not overlap; Described lamp housing front surface be more than or equal to 1/3 to being less than 1/2 blacking, and have the optical transmission window of a square or rectangular, optical transmission window is just to LED silk place plane, and be positioned at the center that lamp housing is coated with black flour, the center of optical transmission window and the line of LED silk place planar central are positioned in X-axis; Or described lamp housing surface not blacking, place the diaphragm of a blacking before lamp, stop plane is parallel to LED silk place plane, and the center of diaphragm and the line of LED silk place planar central are positioned in X-axis.
Described lamp housing of the present invention can be the shapes such as pyriform, cylindricality, spherical, taper.
As a preferred version of the present invention, described lamp housing resembles a pear in shape, and lamp housing is preferably A80-A170 cell-shell, more preferably A125 cell-shell.The heating of LED silk is derived by lamp housing by inert gas, and the selection of lamp housing size is relevant to the power of lamp, and small light adopts little lamp housing, and high-power lamp adopts large lamp housing.Adopt little glass bulb in power one timing of lamp, can conveniently transport and store, reduce costs; But can preheating time be increased, shorten the life-span of lamp, reduce the stability of lamp.A125 glass bulb selected by the present invention both can ensure the meter characteristic of 4.8W standard lamp, again with the lamp housing sizableness of existing standard lamp of luminous intensity, was convenient to use on existing photometric measuring apparatus.
As another preferred version of the present invention, described lamp housing is cylindricality, and cylindrical body diameter is preferably 19-61mm, more preferably 27mm.Only have all filaments coplanar for pyriform glass bulb, and be positioned at lamp housing center, the reflection image of filament could overlap with filament, otherwise a lantern festival presents multiple light emitting source, and in measuring surface, illumination field uniformity can lower; Selected cylindricality glass bulb, the reflection image of filament is positioned at the top of lamp, reduces the requirement of debuging for standard lamp filament, improves yield rate.The heating of LED silk is derived by lamp housing by inert gas, and the selection of lamp housing size is relevant to the power of lamp, and small light adopts little lamp housing, and high-power lamp adopts large lamp housing.Adopt little glass bulb in power one timing of lamp, can conveniently transport and store, reduce costs; But can preheating time be increased, shorten the life-span of lamp, reduce the stability of lamp.Selected by the present invention, the cylindricality glass bulb of diameter 27mm can ensure the meter characteristic of 1.6W standard lamp.
Preferably, described lamp housing is colourless, transparent glass, and optical transmission window place does not have obvious anti-alkali, sends out the defects such as mist, striped, bubble, the grains of sand, scratch.
As a preferred version of the present invention, for pyriform lamp housing, a bending is arranged at the top of described filament support, realizes described LED silk and the projection of filament support vertical portion in XZ plane does not overlap.The top of filament support is made to be positioned at glass bulb center by the bending of filament support top.Preferably 45 ° (degree) bending, make filament support and Z axis parallel portion in the projection of XZ plane with glass bulb center at a distance of about 4mm, the intensity decline of filament support is little, can ensure the supporting role to filament when filament is lighted and when transporting for long-distance; 45 ° is global angle, is easy to processing, can improves yield rate, reduce costs.
As a preferred version of the present invention, the vertical portion (parallel with Z axis) of described filament support and the projection of LED silk in XZ plane 1-6mm apart, more preferably at a distance of 4mm.The starting point of luminous intensity standard lamp measuring position is the front surface of filament, need the position adjusting lamp to make the projection of filament in XZ plane parallel with Z axis in use, in order to improve the precision of adjustment, filament support and filament project and should not overlap, and should at intervals, with conveniently recognized.Time both standoff distance less (1-3mm), under and environment that contrast is low bad in projection lamp collimation, both projections are not easily differentiated; When both standoff distances are larger, the bending degree of filament support is large, and the intensity of filament support reduces, and is unfavorable for the long-distance transport of standard lamp.The interval of 45 ° of (degree) bendings and 4mm both can ensure the precision that filament position adjusts, and can ensure again the intensity of filament support.
As one embodiment of the invention, described lamp housing front surface is more than or equal to 1/3 to being less than 1/2 except optical transmission window, be preferably greater than or equal to 2/5 to being less than 1/2 part, with auto lamp shading liquid blacking and through baking, auto lamp shading liquid is normally by organic siliconresin and the formulated a kind of high-temperature resistant coating of organic solvent.Such structure effectively reduces the veiling glare caused by filament reflection image and filament support.
As a preferred version of the present invention, described LED silk is arranged into square filament plane, and a foursquare optical transmission window is opened on the blacking surface of lamp housing.
As another preferred version of the present invention, described LED silk is arranged into rectangle filament plane, and a rectangular optical transmission window is opened on the blacking surface of lamp housing.
As a preferred embodiment, the side ratio filament flat edge of described optical transmission window is grown up 2-10mm, more preferably large 4-8mm.Lamp housing surface blacking is to be shielded by the veiling glare of lamp, the light that optical transmission window should only make filament send arrives measurement plane, therefore the size of optical transmission window should be greater than filament plane slightly, so both maskable veiling glares, ensure again not block the light that filament sends, optical transmission window is crossed conference and veiling glare is leaked, and optical transmission window is too small exists again the risk of blocking filament.
As another scheme, described lamp housing surface not blacking, 15-30mm before lamp, the diaphragm of preferred 20mm place placement one blacking, diaphragm aperture efficiency filament flat edge is grown up 3-8mm, more preferably large 4-6mm.Such design can effectively reduce the veiling glare caused by filament reflection image and filament support, eliminates the operation of lamp housing blacking.
Preferably, described heat radiation protection gas is inert gas, comprises nitrogen or helium, is more preferably helium.Such design effectively can reduce the junction temperature of LED, improves the stability of lamp, extends the life-span of lamp.
Preferably, described filament support is iron nickel plating, glass and molybdenum filament.For pyriform lamp housing, filament support is iron nickel plating; For cylindricality lamp housing, the top of filament support is molybdenum filament, and middle part is glass, and bottom is iron nickel plating, is fixed on glass bulb by filament glass supporter by molybdenum filament.
Preferably, described LED silk luminous intensity standard lamp adopts direct current current constant mode to power.LED is semiconductor devices, can only one-way conduction, therefore adopts the type of drive of direct current, and business LED adopts the drive pattern of alternating current 220V, but has an AC-DC conversion module in lamp holder; The luminous intensity of LED and drive current positive correlation, adopted constant current drive pattern, realized the meter characteristic of standard lamp by the precise hard_drawn tuhes of drive current.
The structure of LED silk luminous intensity standard lamp provided by the invention is simple, and filament support and filament not in same plane, are easy to debuging of lamp in the projection of XZ plane; Horizontal and vertical angular characteristics is good; In measuring surface, illumination field distribution is even; Compare with traditional incandescent standard lamp, preheating time is suitable, value repeatability is better, life-span is longer, there is good stability, anti-vibration, yield rate is high, cost is low advantage, and calibration for measuring illumination photometer and the luminance meter of LED light source time significantly can reduce the uncertainty of the measurement result caused due to spectral mismatch.
Accompanying drawing explanation
Fig. 1 is the coordinate system schematic diagram of a kind of LED silk luminous intensity standard lamp of the present invention, and reference axis initial point is positioned at lamp housing center.
Fig. 2 is the sectional structure schematic diagram of a kind of pear-shaped LED lamp silk luminous intensity standard lamp of the present invention.
Fig. 3 is the front view of a kind of pear-shaped LED lamp silk luminous intensity standard lamp of the present invention.
Fig. 4 is the rearview of a kind of pear-shaped LED lamp silk luminous intensity standard lamp of the present invention.
Fig. 5 is the side view of a kind of pear-shaped LED lamp silk luminous intensity standard lamp of the present invention.
Fig. 6 is the sectional structure schematic diagram of a kind of cylindrical LED filament luminous intensity standard lamp of the present invention.
Fig. 7 is the front view of a kind of cylindrical LED filament luminous intensity standard lamp of the present invention.
Description of reference numerals: 1-lamp holder; 2-negative pole line; 3-glass stem; 4 – positive pole lines; 5-LED filament; 6-lamp housing; 7-filament support; 7a ?molybdenum filament; 7b ?glass; 7c ?iron nickel plating; 8-optical transmission window.
Detailed description of the invention
Be described below the exemplary of the present invention with diagram.The program has been included in LED silk luminous intensity standard lamp.Certainly, it will be apparent to those skilled in the art that preferred embodiment discussed below is exemplary in itself, and can be changed when not departing from scope and spirit of the present invention.But, in order to clear and accurate, described exemplary discussed below can comprise preferred step, method and feature, and those of ordinary skill in the art it will be appreciated that, these preferred step, method and features are not the necessary conditions fallen within the scope of the present invention.
Embodiment 1
A kind of pear-shaped LED lamp silk luminous intensity standard lamp as Figure 2-Figure 5, comprising: lamp holder 1 and lamp housing 6, be provided with glass stem 3, filament support 7, LED silk 5 in lamp housing 6, lamp housing 6 seals and is filled with helium; Filament support 7 is fixed on glass stem 3, and draw two seal wires in glass stem 3 and be respectively positive pole line 4 and negative pole line 2, positive pole line 4 is connected with the center of lamp holder 1, and negative pole line 2 is connected with the edge spiral of lamp holder 1; LED silk 5 totally 6, the long 31mm of every root filament, wide 1.6mm, rated power 0.8W, electric current 12mA, colour temperature 2670K, colour rendering index 81, the two ends of filament are individually fixed in the upper and lower of filament support 7, and LED silk 5 adopts every 3 one group parallel connection, after the mode of connecting again by square (length of side 31mm) plane of parallel arrangement in lamp housing at equal intervals, the center of square-shaped planar is consistent with the center of lamp housing 6; Lamp housing 6 selects A125 cell-shell, adopts high-quality glass material.The 9/20 surface car light shading liquid blacking of lamp housing 6, and have the optical transmission window 8 of a square (length of side 37mm), optical transmission window 8 is positioned at the center being coated with black flour, and just to LED silk place plane, the line of its center and LED silk place planar central is positioned in X-axis.
The drive current of above-mentioned pear-shaped LED lamp silk luminous intensity standard lamp is 30mA, and voltage is 133V, adopts existing photometric measurement experimental provision to test its preheating time, value repeatability, illumination field uniformity and luminous intensity.Its preheating time is 10min, and luminous intensity value repeatability is 0.06%, to light in 1200 hours that value is maximum is changed to 0.32%.During test, the distance of lamp and detector receiving plane is 1.2m, detector diaphragm diameter 8mm, test result is the illumination field inhomogeneities (at central point normalizing) in the illumination field of distance lamp 1.2m in 10mm × 10mm region is 0.4%, and luminous intensity is 43.01cd.
Embodiment 2
A kind of cylindrical LED filament luminous intensity standard lamp as Figure 6-Figure 7, comprising: lamp holder 1 and lamp housing 6, be provided with glass stem 3, filament support 7, LED silk 5 in lamp housing 6, lamp housing 6 seals and is filled with helium; Filament support 7 is fixed on glass stem 3, draws two seal wires and is respectively positive pole line 4 and negative pole line 2, be connected respectively with the two ends of lamp holder in glass stem 3; LED silk 5 totally 2, the long 31mm of every root filament, wide 1.6mm, rated power 0.8W, electric current 12mA, colour temperature 2670K, colour rendering index 81, the two ends of filament are individually fixed in middle part and the bottom of filament support 7, and filament support 7b (glass) is fixed on the top of lamp housing 6 by another filament support 7a (molybdenum filament); LED silk 5 adopts series system to be connected, and be arranged in a rectangle (length of side 31mm × 18mm) plane in lamp housing, the center of rectangular planes is consistent with the center of lamp housing 6; Lamp housing 6 diameter 27mm, adopts high grade quartz glass material.2/5 surface car light shading liquid blacking of lamp housing 6 also has the optical transmission window 8 of a rectangle (length of side 35mm × 22mm), and just to LED silk 5 place plane, the line of its center and LED silk 5 place planar central is positioned in X-axis.
The drive current of above-mentioned cylindrical LED filament luminous intensity standard lamp is 12mA, and voltage is 133V, adopts existing photometric measurement experimental provision to test preheating time of this cylindrical LED filament luminous intensity standard lamp, value repeatability, illumination field uniformity.Its preheating time is 10min, and luminous intensity value repeatability is 0.06%, to light in 1200 hours that value is maximum is changed to 0.4%.During test, the distance of lamp and detector receiving plane is 1.0m, detector diaphragm diameter 8mm, test result is the illumination field inhomogeneities (at central point normalizing) in the illumination field of distance lamp 1.0m in 10mm × 10mm region is 0.5%, and luminous intensity is 16.32cd.
Claims (10)
1. a LED silk luminous intensity standard lamp, comprise: lamp holder (1) and lamp housing (6), be provided with glass stem (3), filament support (7), LED silk (5) in lamp housing (6), lamp housing (6) seals and is filled with heat radiation protection gas;
Described filament support (7) is fixed on glass stem (3), draw two seal wires in described glass stem (3) and be respectively positive pole line (4) and negative pole line (2), positive pole line (4) is connected with the two poles of the earth of lamp holder (1) respectively with negative pole line (2);
Described LED silk (5) is fixed on filament support (7), at equal intervals the YZ plane of parallel arrangement in lamp housing, and in square or rectangular, planar central is arranged in lamp housing (6) in the heart; Described LED silk (5) and the projection of filament support (7) vertical portion in XZ plane do not overlap;
Described lamp housing (6) front surface be more than or equal to 1/3 to being less than 1/2 blacking, and have the optical transmission window (8) of a square or rectangular, optical transmission window (8) is just to LED silk (5) place plane, be positioned at the center that lamp housing (6) is coated with black flour, the center of optical transmission window (8) and the line of LED silk (5) place planar central are positioned in X-axis; Or described lamp housing (6) surface not blacking, place the diaphragm of a blacking before lamp, stop plane is parallel to LED silk (5) place plane, and the center of diaphragm and the line of LED silk (5) place planar central are positioned in X-axis.
2. LED silk luminous intensity standard lamp according to claim 1, is characterized in that, the vertical portion of described filament support (7) and the projection of LED silk (5) in XZ plane 1-6mm apart, more preferably at a distance of 4mm.
3. LED silk luminous intensity standard lamp according to claim 1, is characterized in that, described lamp housing (6) resembles a pear in shape, the preferred A80-A170 cell-shell of lamp housing, more preferably A125 cell-shell; One bending is arranged at the top of described filament support (7), preferably 45 degree of bendings.
4. LED silk luminous intensity standard lamp according to claim 1, is characterized in that, described lamp housing (6) in cylindricality, the preferred 19-61mm of cylindrical body diameter, more preferably 27mm.
5. the LED silk luminous intensity standard lamp according to claim 1-4 any one, is characterized in that, described lamp housing (6) front surface be more than or equal to 2/5 to being less than 1/2 blacking.
6. the LED silk luminous intensity standard lamp according to claim 1-4 any one, it is characterized in that, described LED silk (5) is arranged into square filament plane, and a foursquare optical transmission window (8) is opened on the blacking surface of lamp housing (6).
7. the LED silk luminous intensity standard lamp according to claim 1-4 any one, it is characterized in that, described LED silk (5) is arranged into rectangle filament plane, and a rectangular optical transmission window (8) is opened on the blacking surface of lamp housing (6).
8. the LED silk luminous intensity standard lamp according to claim 6 or 7, is characterized in that, the side ratio filament flat edge of described optical transmission window (8) is grown up 2-10mm, more preferably large 4-8mm.
9. LED silk luminous intensity standard lamp according to claim 1, is characterized in that, 15-30mm before lamp, the diaphragm of preferred 20mm place placement one blacking, and described diaphragm aperture efficiency filament flat edge is grown up 3-8mm, more preferably large 4-6mm.
10. LED silk luminous intensity standard lamp according to claim 1, is characterized in that, described inertia heat radiation protection gas is nitrogen or helium, more preferably helium.
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| CN201610113751.3A CN105570701B (en) | 2016-02-29 | 2016-02-29 | A kind of LED filament luminous intensity standard lamp |
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| CN106090665A (en) * | 2016-08-01 | 2016-11-09 | 佛山科学技术学院 | LED filament lamp that how photochromic many power are and preparation method thereof |
| US10323799B2 (en) | 2016-10-26 | 2019-06-18 | Liquidleds Lighting Corp. | Light-emitting diode filament with a heat-dissipating structure and light-emitting diode filament light bulb using the same |
| US10598314B2 (en) | 2017-03-31 | 2020-03-24 | Liquidleds Lighting Corp. | LED lamp |
| TWI727150B (en) * | 2017-06-02 | 2021-05-11 | 日商東芝照明技術股份有限公司 | Lead wire and manufacturing method of vehicle bulb |
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