NS45B 45mm Optical Shutter

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Overview

The Uniblitz NS45B is a 45mm-aperture bi-stable optical shutter utilizing our patented N-CAS® technology. The NS45B’s simple design provides maximum clearance around the aperture, and a machined flat surface makes for its easy integration into telescopes, video cameras, etc. The NS45B has an overall diameter of 3.915 inches, and an electronic synchronization is available.

Bi-stable shutter devices, like the NS45B, require no power to hold the blades in either the open or closed state

Specifications

For additional technical information please see the NS45B Optical Shutter Datasheet.

1 Two 12 OHM coils wired in parallel
2 Peak voltage as provided by the VED24 Driver
3 (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

The synchronization system for NS 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 NS 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.

Shutter Timing

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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.

 

NS45B (w/ VDM1000 and Teflon® coated blades)		Time (msec.)
O – A:	Delay time on opening after current applied	7.0
A – C:	Transfer time on opening	12.0
O – C:	Total opening time	19.0
C – E:	Min. dwell time with min. input pulse	12.5
B – F:	Min. equivalent exp. time	6.0
D – E:	Delay time on closing after current applied	24.5
E – G:	Transfer time on closing	12.0
A – G:	Total window time	36.5
MET:	Min. exposure time	26.0
TEP:	Typical exposure pulse	>30.0

 

Technical Drawing