Assisted Fiber-optic & Electric Rotary Joints

The Assisted Fiber-optic & Electric Rotary Joint is electrically driven as it senses and follows the tethered animal’s rotations. It detects the torsion of the optical cable during the animal movements and releases it with a very high sensitivity. 

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The Assisted Fiber-optic & Electric Rotary Joint is electrically driven as it senses and follows the tethered animal’s rotations. It detects the torsion of the optical cable during the animal movements and releases it with a very high sensitivity. A good electrical signal transmission requires frictional contacts that brake the rotation of the rotary joint. The assistance of this rotary joint helps to counter the resistive force and offers a good transmission of the signal during experiment with freely moving small animals like mice. It comes with 12 electrical contacts and one optical channel with FC receptacles on both ends.

If the experiment requires a really stable output (e.g. miniaturized fluorescence microscopy), we recommend the use of the Pigtailed Assisted Fiber-optic & Electric Rotary Joints (AHRJ-OE_PT_AH_12_HDMI and AHRJ-OE_PT_AH_12_USB-C, see the Miniaturized Fluorescence Microscopy section). These rotary joints have pigtailed input (1 m) and output (0.2 m) fiber-optic patch cords of 200 µm diameter, NA 0.48 with a light weight metal jacket.

The Assisted Fiber-optic & Electric Rotary Joints can be designed with two types of lenses: achromatized doublet (AD) and aspheric 0.53 NA (AH). The achromatized doublets AD allow a near-equal focal distance for wavelengths between 450 nm and 650 nm, minimizing chromatic aberration. Our AD models are designed for use with a 200 µm core, 0.22 NA optical fiber. The 0.53 NA aspheric AH is optimized for reduced optical aberration. It is designed for use at a wavelength of 470 nm.

Contact us to discuss the possibility of custom wavelengths and NA.

Notes:

• The holder for the Assisted Fiber-optic & Electric Rotary Joint is included (Holder_ARJ).
• The output fiber-optic patch cords are also included.
• An optional adapter kit can be provided to allow a Harwin-connectorized rotary joint to be used with an Omnetics-connectorized systems (ADAPTER_HO12).



HDMI pinout assisted

Maximum variation2%
Transmission80%
Input NA0.22 or 0.5
Output NA0.22 or 0.5
Harwin Electrical ConnectorMale Datamate L-Tek, 2 mm pitch, 2 rows of 12
HDMI Electrical ConnectorFemale Blackrock 2 Pinout, Microscope Pinout
Number of contacts12
Contact materialGold
Contact resistanceLess than 500 mOhm
Resistance variation during rotation (constant rotation)Less than 100 mOhm at 5 VDC
Maximum current (typical)2 A per contact
Start up torqueLess than 20 µN·m
Rotation speedUp to 300 rpm
Length83 mm
Outer Diameter56 mm
Mass208 g
HolderHolder_ARJ included
NoteTested with 200 µm core NA 0.22 fiber-optic patch cords

AHRJ_OE-DRAWING.pdf

Assisted Fiber-optic & Electric Rotary Joint

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AHRJ-OE_MANUALV1.0.3.pdf

User Manual for Assisted Fiber-optic & Electric Rotary Joint

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