Safety Shutter for Phototherapy Devices - Component Specifications

Product Specifications

Technical details and manufacturing context for Safety Shutter

Definition

The safety shutter is a critical safety component in portable home phototherapy devices that physically prevents accidental exposure to therapeutic light when the device is powered on but not actively treating a patient. It serves as a fail-safe mechanism that must be manually or automatically engaged/disengaged to ensure controlled light delivery only during intended treatment sessions. The shutter operates either mechanically (sliding barrier) or optically (filter wheel) to block the light path between the LED/lamp source and the treatment surface. It typically engages automatically when the device is powered on or when treatment is paused, and only retracts when the device is in active treatment mode with proper user confirmation. This component is designed for integration into phototherapy devices used in home settings, where user safety is paramount. The shutter is available in configurations using ABS plastic, polycarbonate, or aluminum alloy, with an anodized aluminum housing (Al 6061-T6) for corrosion resistance. Key parameters include an operating temperature range of -20 to 70 °C, a response time of ≤0.1 seconds, optical density ≥4 (blocking >99.99% of light), mechanical life of ≥100,000 cycles, operating voltage of 24 V DC ±10%, power consumption ≤5 W, IP rating IP54–IP65 per IEC 60529, weight 0.5–1.5 kg, aperture size 10–50 mm, leakage rate ≤0.1 mL/min at 1.0 MPa differential pressure, and operating pressure 1.0–1.6 MPa. These values are reference ranges for directory purposes and must be verified for the specific model and application with the legal manufacturer or supplier. The safety shutter is a component, not a standalone device, and its integration requires careful consideration of the phototherapy device's design and safety requirements.

Working Principle

The safety shutter operates by physically blocking or filtering the light path between the light source and the treatment surface. In mechanical designs, a sliding barrier moves into position to obstruct the beam; in optical designs, a filter wheel rotates to insert a light-absorbing or reflecting element. The shutter is typically actuated by a solenoid or motor, controlled by the device's electronics. It engages automatically when the device is powered on or when treatment is paused, and retracts only when active treatment is confirmed by the user. The response time of ≤0.1 seconds ensures rapid blocking to prevent accidental exposure. The optical density of ≥4 ensures that over 99.99% of light is blocked, providing effective protection. The mechanical life of ≥100,000 cycles ensures reliable operation over the device's lifetime. The shutter's design must maintain a leakage rate of ≤0.1 mL/min at 1.0 MPa differential pressure to ensure seal integrity, and it operates within a pressure range of 1.0–1.6 MPa. The operating temperature range of -20 to 70 °C defines the environmental limits for reliable function.

Common Materials

ABS plastic, Polycarbonate, Aluminum alloy

Technical Parameters

Parameter	Typical range	Notes & selection driver
Operating Temperature	-20–70 °C	Outside this range, seal integrity may fail.
Response Time	≤0.1 s	Critical for safety interlock.
Optical Density	≥4 OD	Blocks >99.99% of light.
Mechanical Life	≥100000 cycles	Endurance for repeated operations.
Operating Voltage	24 ±10% V DC	Standard actuator supply.
Power Consumption	≤5 W	Peak during actuation.
IP Rating	IP54–IP65	Protection against dust and water jets.IEC 60529
Material	Al 6061-T6	Housing; anodized for corrosion resistance.ASTM B221
Weight	0.5–1.5 kg	Depends on aperture size.
Aperture Size	10–50 mm	Clear aperture for light path.
Leakage Rate	≤0.1 mL/min	At 1.0 MPa differential pressure.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Shutter Blade Part
Primary light-blocking element that moves into the light path

Material: ABS plastic with light-absorbing coating
Actuation Mechanism
Motor or manual system that moves the shutter blade

Material: Stainless steel components
Position Sensor
Detects whether shutter is open or closed for safety interlock

Material: Electronic components with plastic housing
Filter Wheel Optional
Rotates an absorbing or reflecting element into the beam on optical-design shutters.

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Frequently Asked Questions

What is the primary function of the safety shutter?

The safety shutter prevents accidental exposure to therapeutic light when the phototherapy device is powered on but not in active treatment mode. It blocks or filters the light path to ensure light is delivered only during intended treatment sessions.

What materials are used in the safety shutter?

The shutter can be made from ABS plastic, polycarbonate, or aluminum alloy. The housing is typically anodized aluminum (Al 6061-T6) for corrosion resistance. Material selection depends on the specific application and environmental requirements.

What are the key performance parameters to verify?

Key parameters include operating temperature (-20 to 70 °C), response time (≤0.1 s), optical density (≥4), mechanical life (≥100,000 cycles), operating voltage (24 V DC ±10%), power consumption (≤5 W), IP rating (IP54–IP65), weight (0.5–1.5 kg), aperture size (10–50 mm), leakage rate (≤0.1 mL/min at 1.0 MPa), and operating pressure (1.0–1.6 MPa). Always confirm these values with the manufacturer for your specific model.

How does the safety shutter engage and disengage?

The shutter engages automatically when the device is powered on or when treatment is paused. It retracts only when the device is in active treatment mode and the user confirms the start of treatment. This ensures controlled light delivery and prevents accidental exposure.

Data Basis

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Preliminary Technical Classification

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pressure:	0 to 1 bar (atmospheric)
other spec:	Light wavelength range: 200-1100 nm, Response time: <100 ms
temperature:	-20°C to +70°C

Safety Shutter

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Reliability & Engineering Risk Analysis

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