Some standard content:
ICS37.040.10
Machinery Industry Standard of the People's Republic of China
JB/T10069-2002
Replaces JB/T10069-1999
Enlargers
2002-07-16 Issued
2002-12-01 Implementation
Issued by the State Economic and Trade Commission of the People's Republic of China Foreword
Normative References
Terms and Definitions
Technology Requirements
Basic light output
Illumination uniformity
Chromaticity uniformity,
Color correction
Color correction filter
Safety filter (this item is only applicable to black and white enlargers) Light leakage
Film surface temperature rise
Basic dimensions and limit deviations of lens connection threads Parallelism..
Magnification adjustment mechanism and focusing mechanism
Light intensity adjustment
Light shield..
Enlargement ruler.
Timing controller,
Electrical safety Safety.
Appearance,
Test method
Basic light output
Illumination uniformity.
Chromaticity uniformity
Color correction
Color correction filter,
Effect of safety filter
Lens connection thread
Parallelism.
Magnification adjustment mechanism and focusing mechanism
Light intensity adjustment
Light shield
JB/T10069--2002
JB/T10069—20 02
Magnifying ruler
5.16 Timing controller
5.17 Electrical safety.
5.18 Focus parallelism..
5.19 Appearance.
6 General test conditions
7 Inspection rules
8 Marking, packaging, transportation and storage,
8.1 Marking
Transportation and storage
JB/T100692002
This standard is a supplement and modification to JB/T100691999 "Magnifying Machine". In the process of formulating this standard, the relevant content of the relevant technology adoption and the mandatory requirements of the national standards for electrical safety performance are mainly added based on the relevant national standards, so that the technical indicators of the standard are advanced and reasonable, and the quality of the products is improved, which is in line with the actual production and can meet the use requirements of customers. Compared with JB/T10069-1999, this standard has the following main changes: - This standard supplements the content of GB10971-1989 "Color Mixing Head" to the original "Enlarger" standard mainly applicable to black and white photographic paper, making it applicable to the technical requirements of both black and white and color photographic paper enlargement. This standard supplements the lens connection thread specifications used in enlargers based on the internationally commonly used enlarger lens thread series. 3.1.1 Insulation resistance not less than 2MQ in JB/T10069-1999 is changed to 4.17.3 Grounding performance. This standard is proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Photographic Machinery Standardization Technical Committee. The drafting units of this standard: Shanghai Bayi Precision Machinery Co., Ltd., Hangzhou Photographic Machinery Research Institute. The main drafters of this standard: Zhai Jiming, Li Shenpu, Feng Guansen. 1 Scope
Enlarger
This standard specifies the terms and definitions, technical requirements, test methods, and detection rules of photographic enlargers. This standard applies to all kinds of photographic enlargers for professional and amateur photo enlargement. 2. Normative references
JB/T10069—2002
The clauses in the following documents become the clauses of this standard through reference in this standard. For all references with dates, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties who reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all undated references, the latest versions are applicable to this standard. GB/T191-2000 Pictorial marking for packaging, storage and transportation (eqVISO780:1997) GB/T13384-1992 General technical conditions for packaging of electromechanical products JB/T8250.7-1995 Packaging, transportation, storage conditions and test methods for photographic machinery 3 Terms and definitions
Basic luminous exitance basic luminous exitance The luminous exitance of the exit surface of the light source mixing cavity corresponding to the standard exposure time for enlarged photos to obtain appropriate exposure. 3.2
Uniformity of image plane illumination The percentage of the ratio of the minimum illumination (Emin) on the imaging plane to the maximum illumination (Emx) on the imaging plane is called the uniformity of image plane illumination, and is represented by the symbol K.
The calculation formula is as follows:
Emimx100%
Uniformity of image plane color uniformity The percentage of the ratio of the minimum illumination Egmin, EGmia, EBmin of the red, green, and blue light on the imaging plane to the corresponding maximum illumination ERmxEGmax, EBmax of the red, green, and blue light is called the uniformity of image plane color, and is represented by the symbol Kz. i is red, green, and blue respectively. The calculation formula is as follows: Emx100% (i=red, green, blue)
4 Technical requirements
4.1 Basic light output
The basic light output of the exit surface of the color mixing cavity shall not be less than 30000Lx. 4.2 Illumination uniformity
The illumination uniformity of the imaging surface shall not be less than 80%. The central illumination shall not be lower than the illumination of the four corners of the edge. 4.3 Chromaticity uniformity
The chromaticity uniformity of the imaging surface shall not be less than 70%. JB/T100692002
4.4 Color correction amount
Continuously adjusting the color correction knob dial value should make the corresponding color illumination value change in the same direction, and there should be no reverse change. Color correction filter
4.5.1 The optical performance of the color correction filter shall meet the requirements of Table 1. Table
Hongguang Mirror
Yellow (Y)
Magenta (M)
Cyan (C)
Red (R)
Green (G)
Blue (B)
4.5.2 Physical Properties of Filters
4.5.2.1 Appearance Quality of Film
Wavelength Range nm
410~475
520±5
550750
535~565
495±5, 600±5| |tt||400~475, 650~750
630~730
585±5
400~550
380~550
610~730
380~460, 600~730
505-575
535~560
540~750
390~480
The film layer is not allowed to have any signs of damage, such as peeling, delamination, cracks and gray penetration. Transmittance T
Average ≥85%
Average ≥85%
Average ≥85%
≥75%
≥70%
≥75%
4.5.2.2 Film wear resistance
Use a handheld friction tool (grinding head holds 9.8N pressure) to rub 20 times. The film is not allowed to have obvious scratches and damage. 4.5.2.3 Constant heat and humidity
Under the conditions of 40℃±2℃ and relative humidity of 90%~95%, keep it for 24h. The film is not allowed to fall off and the optical properties remain unchanged. 4.5.2.4 Low temperature
Keep it at -20℃±3℃ for 2h. The film should not have cracks or fall off and the optical properties remain unchanged. Safety filter (this item is only applicable to Xibai enlarger) 4.6
The projection image obtained after the light passes through the enlarger safety filter can still be clearly seen, and at the same time, it is projected onto the photosensitive photographic paper placed on the bottom plate. After 1 minute, its density is not greater than 0.04.
4.7 Light leakage
JB/T10069--2002
For other light passing through the enlarger lens, for the bottom plate and the photosensitive paper on the same plane near the bottom plate, after 8 minutes, its density is not greater than 0.04.
4.8 Film surface temperature rise
After the enlarger is used normally for 5 minutes, the temperature rise of the film surface should not exceed 20℃. 4.9 Film clamp
The gap between the two matching surfaces of the film clamp is less than 0.15mm (film area range) 4.10 Basic dimensions and limit deviations of lens connection threads The basic dimensions and limit deviations of lens connection threads are shown in Table 2. Table 2
Nominal diameter
X pitch
: 90×1
4.11 Parallelism
Measurement location
Basic dimensions
External threads
Limit deviation
4.11.1 The parallelism tolerance of the lens mounting plane to the film surface is 0.6mm. 4.11.2 The parallelism tolerance of the bottom plate (imaging) surface to the film surface is 2.4mm. Basic dimensions
Internal threads
Unit: mm
Limit deviation
JB/T10069-2002
4.12 Magnification adjustment mechanism and focusing mechanism 4.12.1 The magnification adjustment mechanism and focusing mechanism should be flexible to adjust and reliable in positioning. 4.12.2 The magnification adjustment and focusing mechanism should be operated continuously for 1000 times, and there should be no abnormal change in performance. 4.13 Light intensity adjustment
Light intensity adjustment should be flexible and convenient, and the positioning should be reliable. 4.14 Light shield
The verticality tolerance of adjacent edges of the light shield is 1mm. 4.15 Magnification scale
4.15.1 When the effective length of the magnification scale is L, the parallelism tolerance of the two planes is 0.005L. 4.15.2 When the effective length of the magnification scale is L, the verticality tolerance of adjacent edges is 0.01L. 4.15.3 The flatness tolerance value of the magnification scale within the maximum working range is 1mm for metal plates and 2mm for wooden boards. 4.15.4 The magnification size should be flexible to adjust, the positioning should be reliable, and the scale bar should be close to the working surface. 4.16 Timing controller
4.16.1 The relative error of the set time should not be greater than 5%. 4.16.2 The relative error of timing repeatability shall not exceed 0.3%. 4.17 Electrical safety
4.17.1 Dielectric strength
The dielectric strength shall be able to withstand 50Hz, 1500V sine wave AC voltage for 1 minute without breakdown or arcing. 4.17.2 Leakage current
The leakage current of the amplifier shall not exceed 3.5mA.
4.17.3 Grounding performance
4.17.3.1 Grounding terminal
For the amplifier, the protective grounding terminal shall be resistant to obvious corrosion. Corrosion resistance can be achieved through appropriate electroplating or coating treatment.
Grounding requirements
The connection resistance between the grounding terminal or grounding contact and the parts that need to be grounded shall not exceed 0.12, and the grounding wire must be a green wire.
4.17.4 All electrical components used in the amplifier shall comply with national standards or industry standards. 4.18 Appearance
4.18.1 Optical parts should not have defects such as clogs, oil stains, bubbles, streaks and scratches that affect the imaging effect. 4.18.2 The paint should be uniform, without paint flow, paint leakage, shedding, cracks, abrasions, scratches and other defects. 4.18.3 Electroplated parts and coatings should not have defects such as shedding, cracks, abrasions, scratches and other defects. 5 Test method
5.1 Basic light output
Place the detector head of the illuminometer at any position on the light source exit surface of the amplifier to measure the light output. The measurement should be carried out 10 minutes after the light source of the amplifier is ignited.
5.2 Illuminance uniformity
Adjust the lens aperture to F8 and the image size to the maximum size specified by the amplifier. Turn all color calibration knobs to zero, adjust the focus, and visually check that there should be no dark spots or bright spots on the entire picture. Then place the detector head of the illuminometer at the center of the picture and at five positions at the diagonal line of the imaging plane 0.4 from the center to measure the illuminance, and take out the ratio Kl of the minimum illuminance Emin and the maximum illuminance Emax in the five positions. During the measurement, all calibration filters are placed at zero position, the low illuminance range of the illuminometer should reach 10-21x, the diameter of the detector head should not be greater than 10mm, and the accuracy of the illuminometer is within 4%. 5.3 Chromaticity uniformity
JB/T10069—2002
Adjust the lens aperture to F8 and the image amplitude to the maximum size specified by the enlarger. Adjust the focus, and then place the detector head of the illuminometer at five positions at the center of the picture and at the diagonal line of the imaging plane 0.4 from the center to measure the red, green and blue illumination when each calibration filter is at 20% and 80% in the optical path, and calculate the ratio K2 of the minimum illuminance Emin and the maximum illuminance Emax in each of the five positions. During measurement, the red, green and blue filters that are consistent with the color analyzer detector head filters should be covered on the illuminometer detection head. The low illumination range of the illuminometer should reach 10-\Ix, the diameter of the detection head should not be greater than 10mm, and the accuracy of the illuminometer should be within 4%. 5.4 Color correction amount
In a dark room, put the enlarger in normal working state, and change the three-color correction adjustment knobs for color enlargement. Then the exposed color photographic paper is subjected to standard washing, and the density meter is used to measure and read the change in the adjacent level value: during the test, the color correction adjustment knobs are changed from the initial value to the final value step by step, and the negative film used in the test is a standard bull's eye film. The accuracy of the densitometer is within 0.01.
5.5 Color correction filter
5.5.1 Optical performance of the filter
Measured by a spectrophotometer.
5.5.2 Physical properties of filters
5.5.2.1 Appearance quality of film
Visual inspection.
5.5.2.2 Abrasion resistance of film
Use a hand-held friction tool to rub vertically on the film, with a stroke of no more than 25mm, and go back and forth 20 times. Clean the surface and then inspect. 5.5.2.3 Constant humidity and heat
Put the tested parts in a constant humidity and heat box, raise the temperature to 40℃±2℃, then adjust the humidity to 90%~95%, keep it for 24h, take out the parts, clean the surface and inspect. 5.5.2.4 Low temperature
Put the tested parts in a refrigerator, cool it to -20℃±3℃, keep it for 2h, immediately take out the parts, clean the surface and inspect. 5.6 Efficacy of safety filter
When using the safety filter, measure the optical density of the photosensitive paper on the bottom plate and the visibility of the projected image. 5.6.1 Put the safety filter in the enlarger film holder without film, cover the part of the photosensitive paper placed on the bottom plate facing the center of the lens with opaque material, then light the enlargement bulb, flash for 1 minute, and then develop the film, and measure the density difference between the covered part and the uncovered part.
5.6.2 After inserting the film holder with suitable film (try to use general image-bearing film), determine the visibility of the projected image in the two states with and without the safety filter. When making the above two measurements, the aperture of the lens must be fully open. According to the diagonal size D (mm) of the film screen used on the enlarger, the magnification ratio is about 37.4/D, see Table 3. Table 3
Specifications mm
24×36
60×60
60×90
102×127
Basic screen size mm
24×36
100×125
Diagonal size of film surface mm
Magnification 37.4/D
JB/T10069--2002
5.7 Light leakage
Install the lens and cover it with a light-proof lens cover. In a dark room, place the photosensitive paper adjacent to the bottom plate of the enlarger at the same height. Cover part of the photosensitive material with light-proof material. Light the enlarging bulb for 8 minutes and then measure the density difference between the covered and uncovered parts after developing and rinsing.
5.8 Temperature rise
After the enlarger has been enlarged normally for 5 minutes, use a thermocouple thermometer to measure the normal film surface temperature. 5.9 Film clamp
The gap between the two matching surfaces of the film clamp is checked with a 0.15mm standard plug. 5.10 Lens connection thread
The lens connection thread is checked with a thread gauge.
5.11 Parallelism
Use an autocollimator to measure the parallelism between the film surface and the lens mounting surface, and the parallelism between the film surface and the bottom plate surface (see Figure [ and Figure 2).
Collimator telescope
Film surface
Mounting surface of the lens
Self-aligned telescope
Bottom plate surface
5.11.1 The minimum scale of the autocollimator telescope is below 5°, and the measuring angle is above 3°. Figure 2
Film surface
Lens mounting surface
Base surface
5.11.2 During measurement, install a reflector on the lens mounting surface. Its parallelism with the mounting reference surface should be adjusted to less than 2. 5.12 Magnification adjustment mechanism and focusing mechanism 5.12.1 Check the flexibility and reliable positioning of the magnification adjustment mechanism and focusing mechanism by hand. 5.12.2 Operate the magnification adjustment mechanism and focusing mechanism 1000 times continuously within the maximum movable range of the enlarger, and check whether there is any abnormal change in performance by hand.
5.13 Light intensity adjustment
Touch test.
5.14 Light shield
The perpendicularity tolerance of the adjacent sides of the light shield is measured by a standard 90° angle ruler. 5.15 Magnifying plate
5.15.1 The parallelism tolerance of the two planes of the magnifying plate can be measured by placing it on a flat plate and using a vernier height gauge. 5.15.2 The perpendicularity tolerance of the adjacent sides of the magnifying plate is measured by using a standard 90° angle ruler. 5.15.3 The flatness tolerance of the magnifying plate is measured by using a flat plate and a dial indicator. 5.16 Timing controller
5.16.1 The formula for calculating the relative error of the setting time: 100%
Where:
——Relative error of setting time:
A——Setting time value: bZxz.net
E——The average value of five measurements.
5.16.2 Relative error of timing repeatability
Use a timer to measure any range within 1s to 10s five times, and calculate the measured value according to the following formula: S,
Where:
8, Relative error of timing repeatability;
E,—Time value of each measurement in five measurements E——Average value of five measurements.
5.17 Electrical safety
5.17.1 Dielectric strength
JB/T100692002
After power is turned on, apply 50Hz, 1500V AC for 1min between the live parts and the dead parts of the whole machine, and check whether there is a shock. 5.17.2 Leakage current
After the rated voltage is applied to the amplifier, connect a 1kQ resistor to the part that the user touches and between the dangerous non-live metal parts and the ground, and measure the leakage current. When recording the test results, the measurement location of each item should be noted. 5.17.3 Grounding performance
5.17.3.1 Visually inspect the screws and locking devices of the grounding terminal. 5.17.3.2 Measure the voltage drop between the grounding terminal or grounding point of the equipment and the easily accessible parts, and then calculate the resistance value based on the voltage drop and current.
5.18 Focus parallelism
Use the color mixing tube and film holder of the largest film size of the enlarger to focus. The clarity of the four corners of the image surface should be consistent after focusing. When measuring the scene, the lens aperture is F8, and the clarity is visually inspected. 5.19 Appearance
Visual inspection.
General test conditions
6.1 The test is carried out in a dark room with an ambient temperature of 15℃～35℃ and a relative humidity of 45%～75%. 6.2 The film holder equipped with the machine should be used during the test, and each screen size should use a corresponding film holder. 6.3 The test shall use the light bulb configured for this machine. After lighting the light bulb, the rated voltage shall be kept within ±3%, and a new light bulb shall be used.
6.4 The test shall use the lens recommended by this machine. 7 Inspection rules
The manufacturer must conduct factory inspection on the items specified in 4.1, 4.2, 4.3, 4.8, 4.10, 4.13, 4.14, 4.15, 4.16, 4.17, 4.19, and 4.20 according to the technical content and test methods of this standard, and the remaining items shall be sampled according to actual conditions. JB/T10069--2002
8 Marking, packaging, transportation and storage
8.1 Marking
The amplifier should have the following markings:
a) Trademark, product name, model, manufacturer name in Chinese: b) Factory number, manufacturing date:
c) Power nature: AC or ~:
d) Rated voltage, unit is V:
e) Rated frequency, unit is Hz:
f) Rated input power, unit is W: or rated current, unit is A. 8.2 Packaging
8.2.1 The outside of the packaging box should be marked with the manufacturer's name, product model, year and month of production, and transportation marks such as "Handle with care", "Afraid of moisture", and "Upward". The markings should comply with the provisions of GBT191-2000. 8.2.2 The packaging box should meet the requirements of moisture-proof, dust-proof and shock-proof. The packing box should contain a packing list, inspection certificate and related random documents. The packaging should comply with the provisions of GB/T13384-1992. 8.3 Transportation and storage
The anti-transportation and storage performance of the amplifier should comply with the provisions of JB/T8250.71995
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