1 Scope
This standard specifies the characteristic parameters and measurement methods for reflection and transmission projection screens. This standard applies to various types of films, slides, projection, recording, and video projection screens, and is not applicable to other special purpose screens
2 Terms and Definitions
The following terms and definitions apply to this document. 2.1
Projection screens
Light reflection and transmission screens with specified optical characteristics used for projection.
. 2.2D-type screen
Also known as diffuse reflection screen. The D-type screen produces diffuse reflection of incident light in a 2r solid angle space, and its brightness coefficient polar characteristic curve is close to the ideal diffuse reflection semicircle
2.3
Type screen
Refers to the gain reflection screen at the incidence angle.
. The reflection of incident light on B-type screens exhibits a concentrated gain reflection characteristic at the incident angle of light in a 2n solid angle space
2.4
S-type screen
Also known as gain reflection screen at the reflection angle.
. The reflection of incident light on an S-shaped screen has a characteristic of concentrated gain reflection in the light reflection angle within a 2r solid angle space, and the magnitude of the reflection angle is equal to or equal to the incident angle2.5
R screen
Function of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problemsBaijian and testing process:
1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
1. The testing industry is fully covered, meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing, with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China