We present the discovery of 5 millisecond pulsars found in the mid-Galactic latitude portion of the High Time Resolution Universe ( HTRU ) Survey .
The pulsars have rotational periods from \sim 2.3 ms to \sim 7.5 ms , and all are in binary systems with orbital periods ranging from \sim 0.3 to \sim 150 d. In four of these systems , the most likely companion is a white dwarf , with minimum masses of \sim 0.2 \mathrm { M } _ { \odot } .
The other pulsar , J1731 - 1847 , has a very low mass companion and exhibits eclipses , and is thus a member of the “ black widow ” class of pulsar binaries .
These eclipses have been observed in bands centred near frequencies of 700 , 1400 and 3000 MHz , from which measurements have been made of the electron density in the eclipse region .
These measurements have been used to examine some possible eclipse mechanisms .
The eclipse and other properties of this source are used to perform a comparison with the other known eclipsing and “ black widow ” pulsars .

These new discoveries occupy a short-period and high-dispersion measure ( DM ) region of parameter space , which we demonstrate is a direct consequence of the high time and frequency resolution of the HTRU survey .
The large implied distances to our new discoveries makes observation of their companions unlikely with both current optical telescopes and the Fermi Gamma-ray Space Telescope .
The extremely circular orbits make any advance of periastron measurements highly unlikely .
No relativistic Shapiro delays are obvious in any of the systems , although the low flux densities would make their detection difficult unless the orbits were fortuitously edge-on .