Basic Principle
A single-edge Diffuse Reflection Press Brake Light Curtain is an advanced industrial safety protection device that achieves safety monitoring by emitting an infrared beam and receiving diffusely reflected light returned from reflecting objects. Unlike traditional through-beam safety light gratings, single-edge diffuse reflection light gratings integrate the transmitter and receiver into a single device, eliminating the need for separate components on both sides.
When this type of light grating is in operation, the built-in transmitter continuously emits an infrared beam. When the beam encounters an object (such as an operator's hand or body), part of the light is diffusely reflected back to the receiver. The system detects changes in the intensity of the received reflected light to determine whether an object has entered the hazardous area, thereby triggering the safety protection mechanism.
Key Features
✅ Single-sided installation: No need for double-sided beam detectors; easy to install in confined spaces and with irregularly shaped equipment; simple wiring.
✅ Easy commissioning: No precise alignment required; good shock resistance; low maintenance.
✅ Suitable for short distances: Typical detection distance is 0.3–2m, suitable for close-range protection.
❌ Distance limitation: Shorter than beam detectors (up to tens of meters), unsuitable for long-span scenarios.
❌ Affected by environmental conditions: Strong light and dark/highly reflective objects may affect detection stabilit
Typical Applications:
Automotive manufacturing: Used for safety protection in stamping, welding, assembly, and other processes.
Packaging machinery: Protects operators from injury caused by high-speed moving parts.
Injection molding: Prevents personnel injury when the mold closes.
Logistics sorting systems: Ensure personnel safety in automated sorting areas.
Food processing: Provides safety protection in cutting, packaging, and other processes.
Electronic assembly: Protects operators during precision assembly processes.
Key Differences Between Single-Sided Diffuse Reflection and Through-Beam Safety Light Curtains
Installation Methods:
* Single-Sided Diffuse Reflection: Requires installation on only one side; all components are integrated into a single unit.
* Through-Beam: Requires precise alignment of the transmitter and receiver, which are installed on opposite sides of the device.
Detection Principle:
* Single-Sided Diffuse Reflection: Detects objects by the light reflected from them.
* Through-Beam: Determines the presence of an object by whether the light beam is blocked.
Suitable Environments:
* Single-Sided Diffuse Reflection: More suitable for situations with limited space or where double-sided installation is not possible.
* Through-Beam: Suitable for scenarios requiring long-distance, high-precision detection.
Interference Resistance:
* Single-Sided Diffuse Reflection: May be affected by ambient reflections. Through-beam type: Generally stronger anti-interference capability
Maintenance complexity: Single-sided diffuse reflection: Simple maintenance, only one unit needs maintenance. Through-beam type: Requires ensuring synchronous operation of both sides of the equipment.
FAQ
Q: Will a single-sided diffused Press Brake Light Curtain be affected by sunlight when used outdoors?
Yes, single-sided diffuse reflection safety light curtains do pose a risk of interference from sunlight when used outdoors, but this depends entirely on the type of technology used. Simply put, traditional infrared diffuse reflection light curtains are almost impossible to operate stably under direct sunlight, while advanced laser diffuse reflection light curtains are specifically designed to solve this problem and possess excellent sunlight resistance.
Conclusions and Recommendations:
1. Define Outdoor Needs: If your application scenario is outdoors or involves strong direct sunlight, you must choose a laser diffuse reflection single-sided light curtain. Do not choose an infrared model due to cost considerations, otherwise you will face the risk of frequent false alarms, missed alarms, or even complete failure.
2. Focus on Key Indicators: When choosing, pay attention to whether the product clearly states "sunlight resistant," "suitable for outdoor use," and its protection rating (IP65 or higher is recommended).
Q: Is it resistant to strong light, dust, and vibration? Any false trigger issues?
Dust/oil: IP65 aluminum housing; lens anti-dust coating. Clean lens monthly to avoid attenuation.
Vibration: Vibration-resistant mounting brackets; internal shock absorption. Stable for CNC, packaging lines.
False trigger: Anti-reflection algorithm + teach-in function. Keep background >1.5× detection distance; avoid shiny metal backgrounds.
Q: How does the Diffuse Reflection Press Brake Light Curtain work?
A: It integrates transmitter and receiver in one unit. It emits infrared light, and detects objects when light reflects back. No opposite receiver is needed, only single-side installation.
Q: What is the detection range and effective distance?
A: Standard detection distance is 0.1m to 2m. The best working range is 0.5m–1.5m for stable accuracy. It is not recommended for use beyond 2.5m.
Q: What's the minimum detectable object size?
A: Depends on optical axis pitch: 10mm pitch for 10mm min object (finger protection), 20mm for 20mm (hand protection), 40mm for 40mm (limb protection). Dark objects may slightly affect detection performance.
Q: Is it easy to install and adjust on Press Brake Light Curtain?
A: Very easy. Single-side mounting saves installation space. Equipped with adjustable brackets and teach-in function for quick calibration, no precise alignment required.
Q: Will strong light, dust or vibration cause malfunction?
A: Built-in infrared filter resists ordinary ambient light; IP65 rating prevents dust and water splash. Internal anti-vibration structure adapts to workshop vibration. Avoid direct strong sunlight and welding arc.
Q: What output types are available?
A: We support NPN, PNP and relay output. Working voltage is universal 12–24VDC, compatible with most industrial PLC and control systems.
Q: What is the response time?
A: The overall response time is ≤20ms, fast enough for emergency stop of punching machines, bending machines and other dangerous equipment.
Q: What is the operating temperature range?
A: Working temperature: -15℃ ~ +65℃. It can work stably in normal industrial workshop environments.
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