JB/T 5577-2002 Method for measuring performance characteristics of transmissive projectors
Some standard content:
ICS37.040.10
N45
JB
Machinery Industry Standard of the People's Republic of China
JB/T5577—2002
replaces JB/T5577.1—1991, JB/T5577.2~1991 Transmissive projectors
Performance characteristics
Measurement methods
Overhead projectors--methods for measuring performance characteristics
Released on 2002-07-16|| tt||2002-12-01 Implementation
Foreword issued by the National Economic and Trade Commission of the People's Republic of China.
1 Scope
2 Normative reference documents
3 Terms and definitions
4 test conditions..
4.1 Environmental conditions,
4.2 Pretreatment
Power supply
4.3
4.4 Projector test conditions| |tt||5 Measurement and calculation of effective luminous flux (light output) 6 Calculation of illumination uniformity
Measurement and calculation of screen span
8 Measurement and calculation of maximum effective projection elevation angle 8.1 Maximum effective Determination of the projection elevation angle
8.2 Measurement and calculation of the maximum effective projection elevation angle 9 Measurement and calculation of the temperature rise of the projection table
m
times
Appendix A (informative appendix ) Transmissive projector projection elevation angle calculation formula derivation, figure! Screen surface size and light measurement point position Figure 2 Schematic diagram of the image projected on the screen with a square pattern for measuring picture distortion Figure 3 Schematic diagram of projection elevation angle
JB/T55772002
JB/T55772002||tt| |Foreword
This standard is not equivalent to ISO9767: 1990 "Photography - Transmissive projectors - Performance characteristics testing and recording methods", and also revised JB/T5577.1 - 199I "Transmissive projectors - Picture distortion" Measurement Method" and JB/T5577.2-1991 "Measurement Method of Transmissive Projector - Projection Elevation Angle".
While revising and merging JB/T5577.1-1991 and JB/T5577.2-1991, this standard adds methods for determining effective luminous flux, illumination uniformity and projection table temperature rise. This standard replaces JB/T5577.1-1991 and JB/T5577.2-1991. Appendix A of this standard is an informative appendix.
This standard is proposed by China Machinery Industry Federation. This standard is under the jurisdiction of Qinhuangdao Audiovisual Machinery Research Institute. The unit responsible for drafting this standard is: Casehuangdao Audiovisual Machinery Research Institute. Units participating in the drafting of this standard: 3M China Co., Ltd., Shanghai Photographic Office Equipment Quality Supervision and Inspection Station, Nanjing New World Changjiang Instrument Co., Ltd.
The main drafter of this standard: Yu Jicun.
Previous versions of the standard replaced by this standard: JB/T5577.1-1991, JB/T5577.2-1991. 1 Scope
Transmissive projector
, performance Characteristic measurement method
JB/T5577-2002
This standard specifies the measurement method for the effective luminous flux, screen illumination uniformity, picture distortion, maximum effective projection elevation angle and projection table temperature rise of the transmission projector
This standard applies to all types of transmissive projectors in JB/T8259.1, and does not apply to reflective projectors and other special-purpose projectors.
2 Normative reference documents
The clauses in the following documents become the clauses of this standard through reference in this standard. For dated reference documents, all subsequent amendments (excluding corrigenda) or revisions do not apply to this section. However, parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. Version. For undated referenced documents, the latest edition applies to this standard. JB/T5381 Transmissive projector picture distortion test version technical conditions (neqISO/DIS9767) JB/T8259.1 Projector projection table size (negISO7943.1: 1987) 3 terms and definitions
The following terms and definitions apply to this standard. 3.1
Projection stage
A working area where slides or other materials are placed on the projector for projection. 3.2
Object plane
A transparent plane area on the projection table specially placed for projection. 3.3
picture area picturearea
The area on the projection table where images can be projected. 3.4
The projection stage aperture is a through hole in the projection stage used to determine the beam boundary of the picture area. 3.5
Transparancy
A general term for a projection film with a projected image for use by a projector. 3.6 | It is measured as the percentage of the maximum deviation between curves and the length of the corresponding straight line. 3.7 | | tt | Projection elevation angle maximunavilableprojectionelevation can project the maximum projection elevation angle of the complete picture area image. It is the relatively smaller elevation angle of the following two: The maximum adjustment amount of the elevation angle adjustment mechanism:
The picture area does not appear on the screen due to projection The extreme elevation angle that causes image loss through the aperture of the projection platform if the elevation angle is too large. 4 Test conditions
4.1 Environmental conditions
The ambient temperature should be 23℃±3℃.
If the manufacturer stipulates additional atmospheric conditions, such as smaller ambient temperature range, relative humidity and atmospheric pressure requirements, the test should be carried out according to the specified conditions and recorded in the test report. 4.2 Pretreatment
Before starting the test, the projector sample should be pretreated for 24 hours in a room that meets the test conditions. 4.3 Power supply
The projector should work under its rated power supply conditions, and the power supply voltage should be adjusted to within 0.5% of its rated voltage (measured at the power socket).
The projector should be designed to be used without voltage adjustment equipment and should adapt to the local voltage (the fluctuation range allowed by the country), but the test should be controlled within 4% of the lamp's calibrated voltage. 4.4 Projector test conditions
4.4.1 The projector should be placed on a stable bracket, and the projector should be kept at a suitable distance from the white matte screen placed vertically for testing to ensure that the projected image of the projector The width and height of the commercial area formed on the screen are both 1.5m; when the size of the projection table is designed to be larger or smaller than the passband type A or B, the test projection screen can be calculated based on the 6 times magnification of the screen area size of the projection table. And its dimensions should be indicated in the test report. If possible, the plane of the projector bracket should be able to be tilted by at least 30° to facilitate testing in accordance with the elevation test method 2 of 8.2.2.
Adjust the position and elevation of the projector so that: the projection optical axis of the projector is horizontal and perpendicular to the screen surface, so as to achieve the position of each horizontal and vertical side line of a 1.5m square image on the screen The deviation is no more than 0.025m, see Figure 1. - Within the error range of 0.025m given above, the trapezoidal error of the square should be the smallest. The projection optical axis should pass through the center of the objective lens group. 4.4.2 Use a commonly used slide film to adjust the focus so that the overall picture quality is the clearest. The slide film should be moved when adjusting the focus. 5 Measurement and calculation of effective luminous flux (light output) 5.1 The illuminance meter should have spectral response characteristics that comply with the standard observer proposed by the International Commission on Illumination (CIE) in 1931. 5.2 The photosensitive element of the illuminance meter should be close to the screen plane and should be parallel to the screen so that the projection beam of the projector can be measured directly. 5.3 After the focus adjustment is completed according to 4.4.2, no projection film should be placed on the projector table. A square picture according to the light aperture of the projection table as described in 4.4.1 should be projected on it.
5.4 The interfering light on the screen should be controlled to a minimum. It is required that when the projector is turned on and the light hole of the projection table is blocked by an opaque body, the illumination at any measurement point should not be greater than that according to 5.1% of the lowest illumination out of 9 points obtained in 6. 5.5 Before formal measurement, the projector should turn on the lamp and work for at least 20 minutes. 5.6 When Chapter 4 and the above conditions are met, the illuminance readings can be measured with a light meter at the 9 o'clock positions as shown in Figure 1, with the unit being 1x. The effective luminous flux is calculated using the following formula: @=E.'A...
where:
2
(1)
@——effective luminous flux, The unit is lm;
JB/T5577—2002
E.—The average value of 9-point illumination readings, the unit is x: the area of ??the projection screen, which is the projection of the light hole on the projection table on the silver statue The product of the full width and full height of the screen, the unit is m2A
re
W/6
Figure 1
6 Calculation of illumination uniformity
W/3
/
me
9/H
0.025
0.025
Screen size and light measurement point position 6.1 Usually only the ratio of the lowest value of the four-corner illumination at the 9-point position to the center point illumination is calculated to determine the illumination uniformity formula of the transmissive projector as follows:
Eee×100%
n=||tt ||Es
In the formula:
Illumination uniformity, %:
Emi
Es
Four points on the corner (1, 3, 7, 9) The lowest value of illumination, the unit is x: the illumination of a center point 5, the unit is 1x.
(2)
When necessary, the illumination uniformity between points 1, 3, 7, and 9 on all corners and the center point and the four corners 1, 3, 7, and 9 should also be calculated The average illumination between point 8.2
and the center point. The formulas are as follows: E
×100%
,
Es
E×100%
Es
where: || tt||n,
E
- represents the uniform hook between the corner point n (n=1, 3, 7, 9) and the center point, %: the angle point n Illumination, unit is x:
Es—Illuminance at center point 5, unit is x: (3)
(4)
3
JB/T5577—2002
7 represents the average illumination of four points on the corners and the uniformity between the center point 5 and the illumination, %. Em - the average illumination of the four corner points.
7 Measurement and calculation of picture distortion
7.1 Under the conditions of Chapter 4, place a surface distortion test piece that complies with JB/T5381 on the projection table of the projector, with a square pattern External dimensions: Type A (250mm × 250mm) projector is 200mm ± 2.0mm: Type B (285mm × 285mm) projector is 230mm ± 2.0mm, and the center of the square coincides with the center of the light hole of the projection table, and the focus button The provisions of 4.4.2. The screen span test film can be customized.
7.2 The four-sided projection of the square pattern presents the actual image as shown in Figure 2 on the screen. Use a ruler to measure the maximum deviation between the straight lines on the four sides in Figure 2 and the corresponding actual side lines, and the deviation value Expressed by dtdz, ds.d4 respectively, 7.3 select the maximum deviation as dmx from dj, ddd4. Using the corresponding straight line length of H or W, the percentage rate of picture distortion can be calculated. The formula is as follows:
Surface distortion
W (or H)
Determination of the effective projection elevation angle
(5)
When the test conditions Chapter 4 is met, the projection elevation angle is adjusted to the maximum effective position with the help of the elevation adjustment mechanism. This maximum effective elevation angle should It is the relatively smaller angle of the following two: The maximum adjustment amount of the elevation adjustment mechanism
There is no image loss in the upper picture area due to the projection elevation angle being too large The limit elevation angle of the projection table light hole is 8.2 Maximum Measurement and calculation of effective projection elevation angle 8.2.1 Method 1
After determining the maximum effective projection elevation position as described in 8.1, use a protractor to measure the angle 0 between the main ray emerging from the reflector and the horizontal line (see Figure 3).
The maximum effective projection elevation angle of the projector is calculated using formula (6): 4
OA.OC
In the formula:
Incident chief ray:
MN.M'N\
Figure 3 Schematic diagram of projection elevation angle
One reflector:
AB.CD-
One emerging chief ray
Maximum effective Reflector opening angle at projection elevation: =2(α-45°
Maximum effective projection elevation angle, unit is (°): Reflector opening angle, unit is (“).
formula The derivation of (6) is shown in Appendix A.
8.2.2 Method 2
AB.CE
Maximum effective projection elevation angle,
JB/T5577--2002|| tt||Horizontal chief ray and horizontal line:
(6)
After determining the maximum effective projection elevation position as described in 8.1, adjust the horizontal tilt of the projector bracket plane so that the projector body faces Tilt forward until the outgoing main light returns to the horizontal state as in Chapter 4, and record the difference in angle between the before and after adjustment of the bracket as the maximum effective projection elevation angle of the projector
9 Measurement and calculation of the temperature rise of the projection table|| tt||9.1 Turn on the maximum power bulb allowed by the projector and work for 30 minutes under the test conditions in Chapter 4. 9.2 Without turning off the projection light source, use a point thermometer to vertically touch the area with a diameter of 5mm in the center of the projection surface, and take readings every 1 minute. temperature until the temperature rise rate is no more than 0.5°C per minute. 9.3 Record the final temperature of the point thermometer, and subtract the ambient temperature to determine the temperature rise of the projector JB/T5577-2002||tt| |Appendix A
(informative appendix)
Derivation of the calculation formula for the projection elevation angle of a transmissive projector A.1 As shown in Figure 3 in the text, when the reflector opening angle is the original 45, the light is The incident point is A, and the normal line is AP. According to the law of reflection, the reflected light emits along the water direction AB
2 When the mirror opening angle increases to α, the incident point of the light is C, and the normal line is. CS, according to the law of reflection, the reflected light ray emerges along the CD direction A.2
3 and passes through point C to draw a straight line CE parallel to AB. According to the definition of the projection elevation angle, ZDCE is the required projection elevation angle \| tt||It can be seen from Figure 3 that ZDCE=ZDCS-ECSA.4
And: ZM\CA=ZNCD=ZECS,
So: ZDCS=W+ZECS=+ZN\CD= α
That is: w=aECS=a-(90*a)=2(a45°)6
2
is the average value of the illumination and the uniformity of illumination between the center point. The formulas are as follows: E
×100%
,
Es
E×100%
Es
where:
n,
E
- represents the uniformity between the corner point n (n=1, 3, 7, 9) and the center point, %: the illumination of the corner point n, the unit is x:
Es- the illumination of the center point 5, the unit is x: (3)
(4)
3
JB/T5577—2002
7 represents the average illumination of the four corner points and the uniformity between the center point 5 and the illumination, %. Em-the average illumination of the four corner points.
7 Measurement and calculation of image distortion
7.1 Under the conditions of Chapter 4, place a surface distortion test piece that meets the requirements of JB/T5381 on the projection table of the projector. The outer dimensions of the square pattern are: 200mm±2.0mm for type A (250mm×250mm) projector: 230mm±2.0mm for type B (285mm×285mm) projector. The center of the square is aligned with the center of the projection table light hole. Focus is adjusted according to the requirements of 4.4.2. The image distortion test piece can be made by yourself.
7.2 The four sides of the square pattern are projected onto the screen to present an actual image as shown in FIG2. Use a ruler to measure the maximum deviation between the straight lines of the four sides in FIG2 and each corresponding actual side line. The deviation values ??are represented by dtdz, ds.d4, respectively. 7.3 Select the maximum deviation dmx from dj, ddd4. Use the corresponding straight line length H or W to calculate the percentage rate of image distortion. The formula is as follows:
Through-plane distortion
W (or H)
X100%
Figure 2 Schematic diagram of the image projected on the screen using a square pattern for measuring image distortion 8 Measurement and calculation of the maximum effective projection elevation angle 8 .1 Determination of the maximum effective projection elevation angle
(5)
When the test conditions in Chapter 4 are met, the projection elevation angle is adjusted to the maximum effective position with the aid of the elevation adjustment mechanism. This maximum effective elevation angle should be the smaller of the following two angles: The maximum adjustment amount of the elevation adjustment mechanism
The limit elevation angle at which no image loss occurs in the projection table aperture due to excessive projection elevation in the upper picture area. 8.2 Measurement and calculation of the maximum effective projection elevation angle 8.2.1 Method 1
After the maximum effective projection elevation angle position is determined as described in 8.1, use a protractor to measure the angle 0 between the main light ray emitted by the reflector and the horizontal line (see Figure 3).
The maximum effective projection elevation angle of the projector is calculated using formula (6): 4bZxz.net
OA.OC
Wherein:
Incident chief ray:
MN.M'N\
Figure 3 Schematic diagram of projection elevation angle
A reflector:
AB.CD-
A outgoing chief ray
The reflector opening angle at the maximum effective projection elevation angle: =2(α-45°
The maximum effective projection elevation angle, in degrees): The reflector opening angle, in "".
The derivation of formula (6) is shown in Appendix A.
8.2.2 Method 2|| tt||AB.CE
Maximum effective projection elevation angle,
JB/T5577--2002
Horizontal main ray and horizontal line:
(6)
After the maximum effective projection elevation angle position is determined as described in 8.1, adjust the horizontal inclination of the projector bracket plane to tilt the projector body forward until the outgoing main ray returns to the horizontal state as in Chapter 4. The difference in angles before and after the bracket adjustment is the maximum effective projection elevation angle of the projector.
9 Measurement and calculation of the temperature rise of the projection table
9.1 Turn on the maximum power bulb allowed by the projector under the test conditions in Chapter 4. Work for 30 minutes. 9.2 Without turning off the projection light source, use a spot thermometer to vertically contact the 5mm diameter area in the center of the projection table object plane, and read the temperature every 1 minute until the temperature rise rate is no more than 0.5℃ per minute. 9.3 Record the final temperature of the spot thermometer and subtract the ambient temperature to get the temperature rise of the projection table of the projector. JB/T5577-2002
Appendix A
(Informative Appendix)
Derivation of the projection elevation angle calculation formula for a transmission projector A.1 As shown in Figure 3 in the text, when the reflector angle is the original 45, the incident point of the light is A and the normal is AP. According to the law of reflection, the reflected light is along the AB line.
2When the angle of the reflector increases to α, the incident point of the light is C, and the normal is CS. According to the law of reflection, the reflected light is emitted in the direction of CD A.2
3Draw a straight line CE through point C parallel to AB. According to the definition of projection elevation angle, ZDCE is the required projection elevation angle\. A.3
As can be seen from Figure 3, ZDCE=ZDCS一ECSA.4
And: ZM\CA=ZNCD=ZECS,
So: ZDCS=W+ZECS=+ZN\CD=α
That is: w=aECS=a-(90*a)=2(a45°)6
The illumination average between the average value of 2
and the center point. The formulas are as follows: E
×100%
,
Es
E×100%
Es
where: || tt||n,
E
- represents the uniform hook between the corner point n (n=1, 3, 7, 9) and the center point, %: the angle point n Illumination, unit is x:
Es—Illuminance at center point 5, unit is x: (3)
(4)
3
JB/T5577—2002
7 represents the average illumination of four points on the corners and the uniformity between the center point 5 and the illumination, %. Em - the average illumination of the four corner points.
7 Measurement and calculation of picture distortion
7.1 Under the conditions of Chapter 4, place a surface distortion test piece that complies with JB/T5381 on the projection table of the projector, with a square pattern External dimensions: Type A (250mm × 250mm) projector is 200mm ± 2.0mm: Type B (285mm × 285mm) projector is 230mm ± 2.0mm, and the center of the square coincides with the center of the light hole of the projection table, and the focus button The provisions of 4.4.2. The screen span test film can be customized.
7.2 The four-sided projection of the square pattern presents the actual image as shown in Figure 2 on the screen. Use a ruler to measure the maximum deviation between the straight lines on the four sides in Figure 2 and the corresponding actual side lines, and the deviation value Expressed by dtdz, ds.d4 respectively, 7.3 select the maximum deviation as dmx from dj, ddd4. Using the corresponding straight line length of H or W, the percentage rate of picture distortion can be calculated. The formula is as follows:
Surface distortion
W (or H)
Determination of the effective projection elevation angle
(5)
When the test conditions Chapter 4 is met, the projection elevation angle is adjusted to the maximum effective position with the help of the elevation adjustment mechanism. This maximum effective elevation angle should It is the relatively smaller angle of the following two: the maximum adjustment amount of the elevation adjustment mechanism
There is no image loss in the upper picture area due to the projection elevation angle being too large The limit elevation angle of the projection table light hole is 8.2 Maximum Measurement and calculation of effective projection elevation angle 8.2.1 Method 1
After determining the maximum effective projection elevation position as described in 8.1, use a protractor to measure the angle 0 between the main ray emerging from the reflector and the horizontal line (see Figure 3).
The maximum effective projection elevation angle of the projector is calculated using formula (6): 4
OA.OC
In the formula:
Incident chief ray:
MN.M'N\
Figure 3 Schematic diagram of projection elevation angle
One reflector:
AB.CD-
One emerging chief ray
Maximum effective Reflector opening angle at projection elevation: =2(α-45°
Maximum effective projection elevation angle, unit is (°): Reflector opening angle, unit is (“).
formula The derivation of (6) is shown in Appendix A.
8.2.2 Method 2
AB.CE
Maximum effective projection elevation angle,
JB/T5577--2002|| tt||Horizontal chief ray and horizontal line:
(6)
After determining the maximum effective projection elevation position as described in 8.1, adjust the horizontal tilt of the projector bracket plane so that the projector body faces Tilt forward until the outgoing main light returns to the horizontal state as in Chapter 4, and record the difference in angle between the before and after adjustment of the bracket as the maximum effective projection elevation angle of the projector
9 Measurement and calculation of the temperature rise of the projection table|| tt||9.1 Turn on the maximum power bulb allowed by the projector and work for 30 minutes under the test conditions in Chapter 4. 9.2 Without turning off the projection light source, use a point thermometer to vertically touch the area with a diameter of 5mm in the center of the projection surface, and take readings every 1 minute. temperature until the temperature rise rate is no more than 0.5°C per minute. 9.3 Record the final temperature of the point thermometer, and subtract the ambient temperature to determine the temperature rise of the projector JB/T5577-2002||tt| |Appendix A
(informative appendix)
Derivation of the formula for calculating the projection elevation angle of a transmissive projector A.1 As shown in Figure 3 in the text, when the mirror opening angle is the original 45, the light is The incident point is A, and the normal line is AP. According to the law of reflection, the reflected light emits along the water direction AB
2 When the mirror opening angle increases to α, the incident point of the light is C, and the normal line is. CS, according to the law of reflection, the reflected light ray emerges along the CD direction A.2
3 and passes through point C to draw a straight line CE parallel to AB. According to the definition of the projection elevation angle, ZDCE is the required projection elevation angle \| tt||It can be seen from Figure 3 that ZDCE=ZDCS-ECSA.4
And: ZM\CA=ZNCD=ZECS,
So: ZDCS=W+ZECS=+ZN\CD= α
That is: w=aECS=a-(90*a)=2(a45°)6
After the maximum effective projection elevation position as described in 1 is determined, adjust the horizontal tilt of the projector bracket plane to tilt the projector body forward until the outgoing main light ray returns to the horizontal state as in Chapter 4, and record the difference in angles before and after the bracket is adjusted. This is the maximum effective projection elevation angle of the projector.
9 Measurement and calculation of the temperature rise of the projection table
9.1 Turn on the lamp with the maximum power allowed by the projector and work for 30 minutes under the test conditions in Chapter 4. 9.2 Without turning off the projection light source, use a point thermometer to vertically touch an area with a diameter of 5mm in the center of the projection surface, and read the temperature every 1 minute until the temperature rise rate is no more than 0.5°C per minute. 9.3 Record the final temperature of the point thermometer, and subtract the ambient temperature to obtain the temperature rise of the projection table of the projector. JB/T5577-2002
Appendix A
(informative appendix)
Derivation of the calculation formula for the projection elevation angle of a transmissive projector A.1 As shown in Figure 3 in the text, when the reflector When the opening angle is the original 45, the incident point of the light is A and the normal is AP. According to the law of reflection, the reflected light emits in the direction AB.
2 When the mirror opening angle increases to α, the incident point of the light is C and the normal is CS. According to the law of reflection, the reflected light emerges along the CD direction A.2
3 passes through C Point the straight line CE parallel to AB, defined according to the projection elevation angle, ZDCE is the desired projection elevation angle\. A.3
As can be seen from Figure 3, ZDCE=ZDCS-ECSA.4
And: ZM\CA=ZNCD=ZECS,
So: ZDCS=W+ZECS= +ZN\CD=α
That is: w=aECS=a-(90*a)=2(a45°)6
After the maximum effective projection elevation position as described in 1 is determined, adjust the horizontal tilt of the projector bracket plane to tilt the projector body forward until the outgoing main light ray returns to the horizontal state as in Chapter 4, and record the difference in angles before and after the bracket is adjusted. This is the maximum effective projection elevation angle of the projector.
9 Measurement and calculation of the temperature rise of the projection table
9.1 Turn on the lamp with the maximum power allowed by the projector and work for 30 minutes under the test conditions of Chapter 4. 9.2 Without turning off the projection light source, use a point thermometer to vertically touch the area with a diameter of 5mm in the center of the projection surface, and read the temperature every 1 minute until the temperature rise rate is no more than 0.5°C per minute. 9.3 Record the final temperature of the point thermometer, and subtract the ambient temperature to obtain the temperature rise of the projection table of the projector. JB/T5577-2002
Appendix A
(informative appendix)
Derivation of the calculation formula for the projection elevation angle of a transmissive projector When the opening angle is the original 45, the incident point of the light is A and the normal is AP. According to the law of reflection, the reflected light emits in the direction AB.
2 When the mirror opening angle increases to α, the incident point of the light is C and the normal is CS. According to the law of reflection, the reflected light emerges along the CD direction A.2
3 passes through C Point the straight line CE parallel to AB, defined according to the projection elevation angle, ZDCE is the desired projection elevation angle\. A.3
As can be seen from Figure 3, ZDCE=ZDCS-ECSA.4
And: ZM\CA=ZNCD=ZECS,
So: ZDCS=W+ZECS= +ZN\CD=α
That is: w=aECS=a-(90*a)=2(a45°)6
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