JB/T 11849-2018The screen frame system for movie theater (English PDF)

National Standard of the People's Republic of China

Issued by: Ministry of Industry and Information Technology of the People's Republic of China

Contents

• 1 Scope
• 2 Normative references
• 3 Terms and definitions
• 4 Basic construction
• 5 Technical requirements
• 5.1 Projection requirements
• 5.2 Structural requirements
• 5.3 Electrical requirements
• 5.4 Black frame
• 5.5 Noise
• 6 Test methods
• 6.1 Sight line rise value (value c)
• 6.2 Vertical projection angle
• 6.3 Uniformity of brightness
• 6.4 Load
• 6.5 Safety factor against overturning
• 6.6 Requirements of 5.2.3 to 5.2.9, 5.2.12 to 5.2.14, 5.3 and 5.4.1
• 6.7 Levelness error
• 6.8 Plumb error
• 6.9 Diagonal length error
• 6.10 Distance of the screen frame from the rear wall and dimensions of the loudspeaker fixing plate
• 6.11 Check of the distribution of the loudspeaker fixing plates
• 6.12 Safety voltage
• 6.13 Flame retardance
• 6.14 Noise
• 6.15 Stopping position error of the motorised black frame changeover
• 7 Acceptance
• 8 Marking, packaging, transport and storage
• 8.1 Marking
• 8.2 Packaging
• 8.3 Transport and storage
• Figure 1 Diagram of the screen frame system
• Figure 2 Diagram of the adjustment of the effective picture
• Figure 3 Diagram of the vertical projection angle
• Figure 4 Diagram of the forces on the screen frame resisting overturning
• Table 1 Rated values of the classification of the basic environmental conditions