/ / / / FS25 25mm Optical Shutter

FS25 25mm Optical Shutter


Current Lead Time: 4 – 5 weeks

SKU: FS25 Categories: , Tags: ,


Current Lead Time: 4 – 5 weeks

The Uniblitz FS series shutters are designed and optimized to operate directly from +5VDC and do not require a separate driver. Removing the +5VDC (0VDC) closes these shutters. A simple control circuit can be used to operate these shutter devices from a TTL trigger pulse. This control can be also accomplished with our new VLM1 TTL control interface (available soon).

This low-cost innovation provides the reliability of Uniblitz shutters (typical lifetime >300K cycles) at a single operating voltage.

For the remote operation of FS series shutters from a TTL signal or USB interface, check out the VLM1 interface module.


Standard Features

  • 25mm aperture
  • Slim, small form-factor
  • Default closed operation, +5VDC opens the shutter, 0VDC closes the shutter
  • RoHS Compliant
  • Transfer time on opening: 9.0 milliseconds
  • Total opening time: 16.0 milliseconds
  • Operation at +5VDC (open and hold) – Two wire operation, 18-inch flying leads for connection to the actuator coil
  • Black carbon impregnated plastic (C-PET) shutter blades (5 each) – Blade surface only can handle up to 100°C
  • Default closed operation, +5VDC opens the shutter, 0VDC closes the shutter
  • Black anodized aluminum mount (included) provides multiple mounting options
  • Operating temperature range: -40°C to +65°C



For additional technical information please see the FS25 Optical Shutter Datasheet.

Coil Resistance Pulse Voltage to Open Hold Voltage
12 OHMS +5 VDC at 425mA  +5 VDC


Weight (Unhoused/Half/Housed) Operating Temp. Max. Opening Bounce Max. Closing Bounce Max. Freq. of Operation 1 Number of Shutter Blades
22.0 g / 57.0 g / 92.5 g -40 – +65 °C 15% 15% 5.0 Hz / 10.0 Hz 5


1 (Continuous/Burst) Continuous frequency rating specified at shutter’s minimum exposure pulse. Burst frequency rating specified for four (4) seconds maximum with one (1) minute minimum between bursts.


Electronic Synchronization System

[columns] [span7]The synchronization system for FS shutter devices incorporates a small magnet mounted to the driving mechanism and a Hall effect sensor. When the device achieves approximately 80% of full open, the magnet causes the Hall effect sensor to change state, producing a signal to indicate that the shutter has switched to the active state. Shown to the left is the FS series shutter schematic which incorporates the electronic synchronization system. There is no connection to the designated synchronization pins when an electronic sync. is not selected.
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Shutter Timing

[columns] [span5]timing-diagram-fs-web

The question regarding enhancement of shutter speed with the application of user supplied lubricants has been repeatedly asked. It is our experience that lubricating the shutter blades will actually slow the shutter down and eventually render the shutter inoperable. Under no circumstances should any type of lubricant be applied to the shutter blade area.



FS25 (w/ 5VDC and C-PET blades) Time (msec.)
O – A:     Delay time on opening after current applied 7.0
A – C: Transfer time on opening 9.0
O – C: Total opening time 16.0
C – E: Min. dwell time with min. input pulse 15.0
B – F: Min. equivalent exp. time 30.5
E – G: Transfer time on closing 22.0
A – G: Total window time 46.0
MET: Min. exposure time 30.0
TEP: Typical exposure pulse >30.0



Technical Drawings

Technical Drawings – FS25 (Half-Housed – FS25S2C0L)

Uniblitz FS25 25mm Optical Shutter Drawing - Half-housed

Technical Drawings – FS25 (Un-Housed – FS25S1C0L)

Uniblitz FS25 25mm Optical Shutter Drawing - Un-housed

Technical Drawings – FS25 (Housed – FS25S3C0L)

Uniblitz FS25 25mm Optical Shutter Drawing - Housed


Key Features

  • 25mm aperture – (FS Series Application Note)
  • Default closed operation, +5VDC opens the shutter and sustains the device in the open position, 0VDC closes the shutter.  No Driver circuit is necessary.
  • Slim, small form-factor
  • RoHS Compliant
  • Operation at +5VDC (open and hold) – Two wire operation, 18-inch flying leads for connection to the actuator coil.  Place +5VDC/0.5A on Red wire, +5V Return on Brown wire – Shutter opens.  Remove +5V from the Red wire, shutter closes.
Figure #1: Sample drive circuit to control the FS series shutter from +5V TTL


  • To operate the shutter from a TTL signal, figure #1 illustrates a typical, simple circuit that can be used to open and close the shutter. Active High TTL on the TTL Input opens the shutter, Low on the TTL Input closes the Shutter. The FS25 Series Shutter will not operate directly from TTL.
  • This circuit is also built into the new VLM1, TTL Interface Module.


  • Shutter blades – Black carbon impregnated plastic (C-PET) (5) each)
  • Blade surface only can handle up to 100°C and laser power up to 50mW/mm2.

Housing Options:

  • Half Housed – Optimized for cost and function, this Black anodized aluminum mount allows several mounting options.
  • Full Housed – Provides a complete enclosure of the FS25.  This will provide a mounting surface on both sides and two C Mount Female Threads, one each side.
  • Un-Housed – Mainly for OEM applications, the device can be purchased without a mount for direct assembly into a user optical system.
  • The Half and Full Housed options will provide the following standard mounting methods.  (Please note when the mount is selected, the 25.4mm clear aperture of the shutter is reduced to .965 inches.  This is due to the max diameter of the C-Mount.)
  • Allows 30mm Cage System Extension Rods to be directly attached to 4-40 threaded holes in mount surface
  • C-Mount Female threaded aperture bore
  • ¼-20 and M6 threaded holes included for post mounting
  • Provides a flat surface for ease of mounting into an optical system

Electronic Synchronization Option Available:

  • The shutter can be equipped with a sensor to provide a signal to indicate when the shutter achieves an open state. See more information under the FS25 Specification tab.
  • This sensor can be omitted and is not required for shutter operation.

To learn more about optional features, mounting considerations, or VLML/VLM1B TTL interfacing, check out the FS Series Application Note 001.



FS25 Datasheet Download
Emissivity of “C” Blade Type Download
FS Series Application Note 001 Download


3D Models
FS25 3D Models (STEP files included in ZIP) Download

Additional information


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Electronic Sync.