CN106596076B - Car room lamps and lanterns light distribution evaluation method - Google Patents
Car room lamps and lanterns light distribution evaluation method Download PDFInfo
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- CN106596076B CN106596076B CN201611266800.3A CN201611266800A CN106596076B CN 106596076 B CN106596076 B CN 106596076B CN 201611266800 A CN201611266800 A CN 201611266800A CN 106596076 B CN106596076 B CN 106596076B
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The present invention relates to a kind of car room lamps and lanterns light distribution evaluation methods, it is evaluated including the light distribution evaluation to preceding indoor lamp and to the light distribution of rear reading lamp, the following steps are included: (1), determine preceding indoor lamp light distribution region and rear reading lamp light distribution region: (2), determine preceding indoor lamp light distribution domain test point and rear reading lamp light distribution domain test point: (3), measure the brightness value of each test point in each light distribution region: (4), quantitative analysis is carried out with brightness and with optical uniformity to preceding indoor lamp light distribution region and rear reading lamp light distribution region, judgement, the present invention evaluates convenient, reliably, uniformity quantitative analysis can be carried out to each light distribution region, it can guarantee the visual effect of passenger.
Description
Technical field
The present invention relates to a kind of car room lamps and lanterns light distribution evaluation methods, belong to automobile lamp technical field.
Background technique
In recent years, China's development of automobile industry is rapid, and automobile is spread in daily life gradually.Country is right
The statutory standard of automobile external illuminator is improved day by day, to car room lamps and lanterns but ununified standard.Indoor lamp
Light distribution is qualified or not to lack a kind of method of objective measure indoor lamp light distribution essentially according to car manufactures subjective judgement, into
And lead to many indoor lamp preliminary analysis qualifications now, but by the various complaints of consumer after entrucking.It is shone with automobile external
Bright lamp tool is slightly different, and car room lamps and lanterns not only need to consider interior lighting requirement, also to take into account the vision of passenger
Experience.It is therefore proposed that a kind of new method that can objectively evaluate car room lamps and lanterns light distribution is very urgent.
Summary of the invention
It is convenient, reliable that the object of the present invention is to provide a kind of evaluations, can carry out uniformity quantitative analysis to each light distribution region
Car room lamps and lanterns light distribution evaluation method.
The technical solution of the present invention in order to achieve the above objectives is: a kind of car room lamps and lanterns light distribution evaluation method, feature
It is: is evaluated including the light distribution evaluation to preceding indoor lamp and to the light distribution of rear reading lamp, comprising the following steps:
(1), preceding indoor lamp light distribution region and rear reading lamp light distribution region are determined: using the steering wheel plane of driver's cabin before
First light distribution region of indoor lamp, the second light distribution region using seat plane as preceding indoor lamp are simulated in front of passenger knees
Light distribution region of the left and right sides of clinoplain as rear reading lamp, and the plane of passenger knees and horizontal direction angle α are 27
±0.5°；
(2), preceding indoor lamp light distribution domain test point and rear reading lamp light distribution domain test point: the first of preceding indoor lamp are determined
A test point is arranged using steering wheel hub as the center of circle, in the center of circle in light distribution region, on the circumference of two concentric different-diameters
The multiple test points of cloth, the second light distribution region of preceding indoor lamp include at least three rows be arranged along longitudinal direction with lateral separation it is multiple
The left side light distribution region of test point, rear reading lamp is identical with right side light distribution region, including at least three rows are along longitudinal direction and lateral separation
Multiple test points of arrangement；
(3), measure the brightness value of each test point in each light distribution region: lighting preceding indoor lamp, the first light distribution area of preceding indoor lamp
Each test point carries out illumination photometry in each test point and the second light distribution region in domain, each in the first light distribution of indoor lamp region before obtaining
The brightness value E of test pointPreceding 1With the brightness value E of each test point in the second light distribution regionPreceding 2；Rear reading lamp is lighted, to rear reading lamp
Each test point in left side light distribution region and right side light distribution region carries out illumination photometry, and the left side light distribution region for obtaining rear reading lamp is respectively surveyed
Pilot brightness value ERear leftWith each test point brightness value E in right side light distribution regionIt is right afterwards；
(4), quantified to preceding indoor lamp light distribution region and rear reading lamp light distribution region with brightness and with optical uniformity
Analysis, judgement:
1., judge each test point brightness, the illuminance value E of each test point in the first light distribution of current indoor lamp regionPreceding 1≥
The illuminance value E of each test point in 5lx and the second light distribution regionPreceding 2>=5lx, and respectively surveyed in the left side light distribution region of rear reading lamp
The point illumination E of pilotRear leftThe point illumination E respectively tested in >=8lx and right side light distribution regionIt is right afterwards>=8lx, after judging that brightness qualification enters
The light distribution Evaluation for Uniformity in portion, wherein above-mentioned requirements are not achieved in the brightness in any one light distribution region, judge unqualified, terminate to comment
Valence；
2., press | E1-E2|/L1-2≤n×E0/ cm judges the illumination gradient of any two test point in each light distribution region,
Wherein, the E in formula1And E2For the illuminance value of measurement point any in each light distribution region, unit lx；
L1-2For corresponding illuminance value E1Measurement point and illuminance value E2The distance between measurement point, unit cm；
E0For the minimal illumination value in each test point in corresponding light distribution region, unit lx；
N is gradient proportion relationship, and n=0.10；
When 0.1 times of illumination gradient≤test point minimal illumination value of any two test point in each light distribution region, judgement
Optical uniformity qualification is matched in the light distribution region, and wherein above-mentioned requirements are not achieved in the illumination gradient in any one light distribution region, then match
Optical uniformity is unqualified.
The present invention is directed to preceding indoor lamp light distribution region and rear reading lamp light distribution region, determines the steering wheel plane with driver's cabin
As the first light distribution region of preceding indoor lamp, the second light distribution region using seat plane as preceding indoor lamp, and simulate passenger's knee
Light distribution region of the left and right sides of the upper inclined plane in lid front as rear reading lamp, reads with after in preceding indoor lamp light distribution region respectively
Each test point of cloth in lamp light distribution area is read, by measuring the brightness value of each test point in each light distribution region, to each light distribution region
Interior is judged with brightness, after in each light distribution region, brightness meets condition, then is surveyed to any two in each light distribution region
The illumination gradient of pilot is compared, and carrying out uniformity to respective light distribution region can be carried out rational judgment and analysis, evaluation side
Just, it reliably, can guarantee the visual effect of passenger.
Detailed description of the invention
The embodiment of the present invention is described in further detail with reference to the accompanying drawing.
Fig. 1 is the schematic diagram of indoor lamp light distribution regional location before the present invention.
Fig. 2 is the schematic diagram of reading lamp light distribution regional location after the present invention.
Wherein: the 1-the first light distribution region, 1-1-test point, the 2-the second light distribution region, 2-1-test point, 3-left sides
Light distribution region, 3-1-test point, 4-right side light distribution areas, 4-1-test point.
Specific embodiment
Car room lamps and lanterns light distribution evaluation method of the invention, including the light distribution evaluation to preceding indoor lamp and to rear reading lamp
Light distribution evaluation, comprising the following steps:
(1), preceding indoor lamp light distribution region and rear reading lamp light distribution region are determined.
As shown in Figure 1, the first light distribution region 1 using the steering wheel plane of driver's cabin as preceding indoor lamp, with seat plane
The second light distribution region 2 as preceding indoor lamp.As shown in Figure 2, the left and right sides conduct of simulation passenger knees front upper slanted plane
The light distribution region of reading lamp afterwards, the left side light distribution region 3 and right side light distribution region 4 are identical, the plane of passenger knees and level side
To angle α at 27 ± 0.5 °.
(2), preceding indoor lamp light distribution domain test point and rear reading lamp light distribution domain test point are determined.
As shown in Figure 1, the first light distribution region 1 of indoor lamp is arranged using steering wheel hub as the center of circle in the center of circle before the present invention
One test point 1-1 is evenly distributed with multiple test point 1-1, multiple surveys on different-diameter on the circumference of two concentric different-diameters
Pilot 1-1 can be arranged with angle or the setting that is staggered.First light distribution region 1 of preceding indoor lamp of the invention is diameter 360mm's
Circumferential area, a test point 1-1 is arranged in the center of circle in the circumferential area of 360mm, in diameter D2 in the circumference of 170 ± 10mm and straight
Diameter D1 is evenly equipped with each test point 1-1 on the circumference of 340 ± 10mm.
As shown in Figure 1, the second light distribution region 2 of indoor lamp includes that at least three rows arrange with lateral separation along longitudinal direction before the present invention
Arrange multiple test point 2-1 of setting.Second light distribution region 2 of preceding indoor lamp of the invention is the rectangular area of 420 × 297mm,
And the horizontal spacing a of adjacent two test points 2-1 in 75 ± 5mm, longitudinal pitch b in 50 ± 5mm, and each test point is along rectangular area
Cross central line and longitudinal centre line be symmetrical arranged.
As shown in Figure 2, the left side light distribution region 3 and right side light distribution region 4 of reading lamp are identical after the present invention, and symmetrically set
It sets, the multiple test point 4-1 arranged along longitudinal direction with lateral separation including at least three rows.As shown in Figure 2, reading lamp after the present invention
Left side light distribution region 3 and right side light distribution region 4 are the rectangular area of 420 × 297mm, and two adjacent test points 3-1,4-1
Horizontal spacing c in 75 ± 5mm, longitudinal pitch d in 50 ± 5mm, and cross central line and longitudinal direction of each test point along rectangular area
Center line symmetrical setting.
(3), the brightness value of each test point in each light distribution region is measured.
Preceding indoor lamp is lighted, in each test point 1-1 and the second light distribution region 2 in the first light distribution region 1 of preceding indoor lamp
Each test point 2-1 carries out illumination photometry, obtains the brightness value E of each test point 1-1 and the second light distribution region in the first light distribution region 1
The brightness value E of each test point 2-1 in 2.Rear reading lamp is lighted, to the left side light distribution region 3 and right side light distribution region 4 of rear reading lamp
Each test point 4-1 carries out illumination photometry, and each test point 3-1 brightness value E in left side light distribution region 3 and right side for obtaining rear reading lamp match
Each test point 4-1 brightness value E in light region 4.
(4), quantified to preceding indoor lamp light distribution region and rear reading lamp light distribution region with brightness and with optical uniformity
Analysis, judgement.
1., judge the brightness of test point in each light distribution region.
In the first light distribution of current indoor lamp region 1 in each test point 1-1 and the second light distribution region 2 each test point 2-1 light
Brightness value E >=5lx, and each test point 4-1 in each test point 3-1 in left side light distribution region 3 of rear reading lamp and right side light distribution region 4
Illumination E >=8lx judges that brightness qualification enters the light distribution Evaluation for Uniformity at rear portion, and wherein the brightness in any one light distribution region reaches
Less than above-mentioned requirements, unqualified, end evaluation is judged.
2., press | E1-E2|/L1-2≤n×E0/ cm judges the illumination gradient of any two test point in each light distribution region.
Wherein, the E in formula1And E2For the illuminance value of measurement point any in each light distribution region, unit lx；
L1-2For E1And E2The distance between, unit cm；
E0For the minimal illumination value in each test point in corresponding light distribution region, unit lx；
N is gradient proportion relationship, and n=0.10；Cm in formula is unit.
When 0.1 times of illumination gradient≤test point minimal illumination value of any two test point in each light distribution region, judgement
Optical uniformity qualification is matched in the light distribution region, and wherein above-mentioned requirements are not achieved in the illumination gradient in any one light distribution region, then match
Optical uniformity is unqualified, therefore is calculated and compared by the illumination gradient to respective light distribution region, realize rational judgment and
Analysis, evaluation are convenient, reliable.
Embodiment 1
As shown in FIGS. 1 and 2 the first light distribution region 1 of preceding indoor lamp of the invention is circumferential area of the diameter in 360mm, in
A test point 1-1 is arranged in the heart, and the center of other test point 1-1 is evenly arranged on the circumference that diameter D2 is 170mm and diameter D1 is
Test point position on the circumference of 340mm, and on diameter D2 is identical as the test point setting angle on 2.
Second light distribution region 2 of preceding indoor lamp is in the rectangular area of 420 × 297mm, the transverse direction of two adjacent test point 2-1
In 75mm, longitudinal pitch b, in 50mm, five row's transverse direction measuring points and five row longitudinal direction measuring points can be used along the transverse direction of rectangular area in spacing a
Center line and longitudinal centre line setting.
Preceding indoor lamp is lighted, it is each in each test point 1-1 and the second light distribution region 2 in the first light distribution region 1 of preceding indoor lamp
Test point 2-1 carries out illumination photometry, obtains brightness value E and table 2 that each position test point is corresponded in the first light distribution region 1 of table 1
In the brightness value E of each position test point is corresponded in the second light distribution region 2.
1 unit of table (lx)
| 10.71 | ||||
| 15.25 | ||||
| 9.01 | 12.93 | 14.41 | 14.70 | 12.09 |
| 12.73 | ||||
| 10.55 |
2 unit of table (lx)
| 12.53 | 12.78 | 13.20 | 11.96 | 12.20 |
| 10.23 | 11.77 | 11.83 | 10.88 | 10.39 |
| 9.36 | 10.24 | 10.02 | 9.64 | 9.35 |
| 7.87 | 8.49 | 8.63 | 8.49 | 8.21 |
| 6.91 | 7.24 | 6.86 | 7.80 | 7.23 |
Each test point in each test point 1-1 and the second light distribution region 2 in first light distribution region 1 of indoor lamp before it can be seen that
The illuminance value E of 2-1 >=5lx, evaluation brightness is qualified, further according to | E1-E2|/L1-2≤n×E0/ cm is calculated, in cup
The illumination gradient maximum value in the first light distribution region 1 of lamp is 0.0593 < 0.10, the gradient in the second light distribution region 2 of preceding indoor lamp
Maximum value is 0.0671 < 0.10, and preceding indoor lamp is qualified with optical uniformity.
The left side light distribution region 3 and right side light distribution region 4 of reading lamp are surveyed in the rectangular area of 420 × 297mm, adjacent two afterwards
The horizontal spacing c of pilot 3-1 in 75mm, longitudinal pitch d in 50mm, using five row's transverse direction measuring points and five row longitudinal direction measuring points and along square
The cross central line and longitudinal centre line in shape region are arranged.Rear reading lamp is lighted, to each of the left side light distribution region 3 of rear reading lamp
The test point 4-1 of the corresponding each position of the test point 3-1 of corresponding position and right side light distribution region 4 carries out illumination photometry, obtains table 3
Left side light distribution region corresponds to the brightness value E that each position test point is corresponded in each position test point and right side light distribution region.
3 unit of table (lx)
As can be seen from Table 3 after reading lamp left side light distribution region and right light distribution region in each test point illuminance value E
>=8lx, evaluation brightness are qualified.Further according to | E1-E2|/L1-2≤n×E0/ cm is calculated, left side light distribution region illumination gradient
Maximum value is 0.0437 < 0.10；Right side light distribution region illumination gradient maximum value is 0.0447 < 0.10, the light distribution of rear reading lamp
Region is qualified with optical uniformity, the brightness in each light distribution region and reaches quantitative analysis, judgment criteria with optical uniformity, in cup
Lamp light distribution is qualified.
Embodiment 2
As shown in FIGS. 1 and 2 the first light distribution region 1 of preceding indoor lamp of the invention is diameter in the circumferential area of 360mm,
A test point 2-1 is arranged in center, and the center of other test point 2-1 is evenly arranged on the circumference that diameter D2 is 160mm and diameter D1 is
Test point position on the circumference of 330mm, and on diameter D2 is identical as the test point setting angle on 2.
And the second light distribution region 2 of preceding indoor lamp is in the rectangular area of 420 × 297mm, the transverse direction of adjacent two test points 2-1
Spacing a in 70mm, longitudinal pitch b in 45mm, using five row's transverse direction measuring points and five row longitudinal direction measuring points and along the transverse direction of rectangular area
Center line and longitudinal centre line setting.
Preceding indoor lamp is lighted, it is each in each test point 1-1 and the second light distribution region 2 in the first light distribution region 1 of preceding indoor lamp
Test point 2-1 carries out illumination photometry, obtains brightness value E and table 5 that each position test point is corresponded in the first light distribution region 1 of table 4
In the brightness value E of each position test point is corresponded in the second light distribution region 2.
4 unit of table (lx)
| 11.10 | ||||
| 15.97 | ||||
| 24.20 | 20.70 | 16.03 | 11.51 | 7.53 |
| 13.89 | ||||
| 11.75 |
5 unit of table (lx)
Each test point in each test point 1-1 and the second light distribution region 2 in first light distribution region 1 of indoor lamp before it can be seen that
Illuminance value E >=5lx, evaluation brightness is qualified.Further according to |/E1-E2|/L1-2≤n×E0/ cm is calculated, preceding indoor lamp
The first light distribution region 1 illumination gradient maximum value be 0.0799 < 0.10；The illumination ladder in the second light distribution region 2 of preceding indoor lamp
Degree maximum value is 0.0600 < 0.10, and preceding indoor lamp is qualified with optical uniformity.
The left side light distribution region 3 and right side light distribution region 4 of reading lamp are surveyed in the rectangular area of 420 × 297mm, adjacent two afterwards
The horizontal spacing c of pilot in 70mm, longitudinal pitch d in 45mm, using five row's transverse direction measuring points and five row longitudinal direction measuring points and along rectangle
The cross central line and longitudinal centre line in region are arranged.Rear reading lamp is lighted, it is corresponding to the left side light distribution region 3 of rear reading lamp each
The test point 4-1 of the corresponding each position of the test point 3-1 of position and right side light distribution region 4 carries out illumination photometry, obtains the left side of table 6
Light distribution region corresponds to each position test point and right side light distribution region corresponds to the brightness value E of each position test point.
6 unit of table (lx)
It can be seen that the illuminance value of each test point 3-1 in the left side light distribution region 3 and right side light distribution region 4 of rear reading lamp
E >=8lx, evaluation brightness is qualified.Further according to | E1-E2|/L1-2≤n×E0/ cm is calculated, 3 illumination of left side light distribution region ladder
Degree maximum value is 0.0437 < 0.10；Right side this light region illumination gradient maximum value is 0.0447 < 0.10, rear reading lamp light distribution
Uniformity is qualified, the brightness in each light distribution region and reaches quantitative analysis, judgment criteria with optical uniformity, and preceding indoor lamp is with photosynthetic
Lattice.Left side light distribution region illumination gradient and 4 illumination gradient maximum value of right side light distribution region of the invention are respectively less than 0.05, have preferable
Match optical uniformity.
Embodiment 3
As shown in FIGS. 1 and 2 the first light distribution region 1 of preceding indoor lamp of the invention is diameter in the circumferential area of 360mm,
A test point 1-1 is arranged in center, and the center of other test point 1-1 is evenly arranged on the circumference that diameter D2 is 180mm and diameter D1 is
On the circumference of 350mm, and each test point 1-1 is arranged with angle.
And the second light distribution region 2 of preceding indoor lamp is in the rectangular area of 420 × 297mm, the transverse direction of adjacent two test point
Spacing a in 80mm, longitudinal pitch b in 55mm, using five row's transverse direction measuring points and five row longitudinal direction measuring points and along the transverse direction of rectangular area
Center line and longitudinal centre line setting.
Preceding indoor lamp is lighted, it is each in each test point 1-1 and the second light distribution region 2 in the first light distribution region 1 of preceding indoor lamp
Test point 2-1 carries out illumination photometry, obtains brightness value E and table 8 that each position test point is corresponded in the first light distribution region 1 of table 7
In the brightness value E of each position test point is corresponded in the second light distribution region 2.
7 unit of table (lx)
| 10.35 | ||||
| 15.81 | ||||
| 23.40 | 19.80 | 15.75 | 11.32 | 7.35 |
| 13.52 | ||||
| 11.27 |
8 unit of table (lx)
| 20.90 | 18.26 | 17.31 | 15.41 | 13.60 |
| 19.08 | 16.26 | 15.01 | 13.53 | 11.77 |
| 17.04 | 14.90 | 13.46 | 11.99 | 10.45 |
| 15.27 | 13.57 | 11.77 | 10.59 | 9.28 |
| 13.45 | 12.06 | 10.70 | 9.54 | 8.35 |
Each test point in each test point 1-1 and the second light distribution region 2 in first light distribution region 1 of indoor lamp before it can be seen that
The illuminance value E of 2-1 >=5lx, evaluation brightness is qualified.Further according to | E1-E2|/L1-2≤n×E0/ cm is calculated, in cup
The illumination gradient maximum value in the first light distribution region 1 of lamp is 0.0874 < 0.10, the gradient in the second light distribution region 2 of preceding indoor lamp
Maximum value is 0.0572 < 0.10, and preceding indoor lamp is qualified with optical uniformity.
The left side light distribution region 3 and right side light distribution region 4 of reading lamp are surveyed in the rectangular area of 420 × 297mm, adjacent two afterwards
The horizontal spacing c of pilot in 80mm, longitudinal pitch d in 55mm, using five row's transverse direction measuring points and five row longitudinal direction measuring points and along rectangle
The cross central line and longitudinal centre line in region are arranged.
Rear reading lamp is lighted, to the test point 3-1 and right side light distribution of the corresponding each position in the left side light distribution region 3 of rear reading lamp
The test point 4-1 of the corresponding each position in region 4 carries out illumination photometry, obtains corresponding to each position test in the left side light distribution region of table 9
The brightness value E of each position test point is corresponded in point and right side light distribution region.
9 unit of table (lx)
After it can be seen that in the light distribution region of reading lamp the illuminance value E of each test point >=8lx, evaluation brightness is qualified,
Further according to | E1-E2|/L1-2≤n×E0/ cm is calculated, and left side light distribution region illumination gradient maximum value is 0.0618 < 0.10；
Right side light distribution region illumination gradient maximum value is 0.0414 < 0.10, and rear reading lamp is qualified with optical uniformity, each light distribution region
Brightness and reach quantitative analysis judgment criteria with optical uniformity, preceding indoor lamp light distribution is qualified.
Claims (4)
1. a kind of car room lamps and lanterns light distribution evaluation method, it is characterised in that: including the light distribution evaluation to preceding indoor lamp and to rear
The light distribution of reading lamp is evaluated, comprising the following steps:
(1), preceding indoor lamp light distribution region and rear reading lamp light distribution region are determined: in using the steering wheel plane of driver's cabin as cup
First light distribution region of lamp, the second light distribution region using seat plane as preceding indoor lamp, simulation passenger knees tilt on front
Light distribution region of the left and right sides of plane as rear reading lamp, and the plane of passenger knees and horizontal direction angle α 27 ±
0.5°；
(2), preceding indoor lamp light distribution domain test point and rear reading lamp light distribution domain test point: the first light distribution of preceding indoor lamp are determined
A test point is arranged using steering wheel hub as the center of circle, in the center of circle in region, uniformly distributed more on the circumference of two concentric different-diameters
A test point, the second light distribution region of preceding indoor lamp include multiple tests that at least three rows are arranged with lateral separation along longitudinal direction
The left side light distribution region of point, rear reading lamp is identical with right side light distribution region, including at least three rows arrange with lateral separation along longitudinal direction
Multiple test points；
(3), measure the brightness value of each test point in each light distribution region: lighting preceding indoor lamp, in the first light distribution region of preceding indoor lamp
Each test point carries out illumination photometry in each test point and the second light distribution region, respectively tests in the first light distribution of indoor lamp region before obtaining
The brightness value E of pointPreceding 1With the brightness value E of each test point in the second light distribution regionPreceding 2；Rear reading lamp is lighted, to the left side of rear reading lamp
Each test point in light distribution region and right side light distribution region carries out illumination photometry, obtains each test point in left side light distribution region of rear reading lamp
Brightness value ERear leftWith each test point brightness value E in right side light distribution regionIt is right afterwards；
(4), quantitatively divided to preceding indoor lamp light distribution region and rear reading lamp light distribution region with brightness and with optical uniformity
Analysis, judgement:
1., judge each test point brightness, the illuminance value E of each test point in the first light distribution of current indoor lamp regionPreceding 1>=5lx and
The illuminance value E of each test point in second light distribution regionPreceding 2>=5lx, and each test point in the left side light distribution region of rear reading lamp
Point illumination ERear leftThe point illumination E respectively tested in >=8lx and right side light distribution regionIt is right afterwards>=8lx judges that brightness qualification enters matching for rear portion
Optical uniformity evaluation, wherein above-mentioned requirements are not achieved in the brightness in any one light distribution region, judge unqualified, end evaluation；
2., press | E1-E2|/L1-2≤n×E0/ cm judges the illumination gradient of any two test point in each light distribution region,
Wherein, the E in formula1And E2For the illuminance value of measurement point any in each light distribution region, unit lx；
L1-2For corresponding illuminance value E1Measurement point and illuminance value E2The distance between measurement point, unit cm；
E0For the minimal illumination value in each test point in corresponding light distribution region, unit lx；
N is gradient proportion relationship, and n=0.10；
When 0.1 times of illumination gradient≤test point minimal illumination value of any two test point in each light distribution region, judge that this is matched
Optical uniformity qualification is matched in light region, and wherein above-mentioned requirements are not achieved in the illumination gradient in any one light distribution region, then light distribution is equal
Even property is unqualified.
2. car room lamps and lanterns light distribution evaluation method according to claim 1, it is characterised in that: the preceding indoor lamp
First light distribution region is circumferential area of the diameter in 360mm, and a test point is arranged in the center of circle in the circumferential area of 360mm, straight
Diameter D2 be on the circumference of 170 ± 10mm and diameter D1 be 340 ± 10mm circumference on be evenly equipped with each test point.
3. car room lamps and lanterns light distribution evaluation method according to claim 1, it is characterised in that: the of the preceding indoor lamp
Two light distribution regions are the rectangular area of 420 × 297mm, and the horizontal spacing a of adjacent two test point is in 75 ± 5mm, longitudinal pitch b
In 50 ± 5mm, and cross central line and longitudinal centre line of each test point along rectangular area are symmetrical arranged.
4. car room lamps and lanterns light distribution evaluation method according to claim 1, it is characterised in that: left side light distribution region
The rectangular area for being 420 × 297mm with right side light distribution region, and the horizontal spacing c of adjacent two test point is in 75 ± 5mm, longitudinal direction
Spacing d is in 50 ± 5mm, and cross central line and longitudinal centre line of each test point along rectangular area are symmetrical arranged.
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