ISRO has selected the Bengaluru based Hind High Vacuum Co Pvt Ltd (HHV), a vacuum science and technology company, under its technology transfer program. HHV will produce the entire thin film metallized circuit for ISRO's satellite program.
In 2017, HHV was awarded a ‘Certification of Qualification’ by the Space Application Center, ISRO for thin film metalized substrates. Circuits are designed on these multi-layered metallised substrates and used in ISRO’s space and satellite program. This indigenously developed technology, as a part of HHV’s ‘Make in India’ initiative, was recognised by the Government of India and the company was conferred with the prestigious National Research & Development Award in May, 2018.
“As a part of ISRO’s technology transfer program and as a forward integration of this award winning technology, HHV will now produce the entire thin film metallised circuit (TFMC) for ISRO’s 40-micron accuracy line, in its new technology production line known as ‘Photo Lithography’. HHV has established a new Photo Lithography Lab (PLL) at its Dabaspet plant to develop TFMCs on alumina substrates that first need to be metallised in a vacuum chamber,” said Prasanth Sakhamuri, Managing Director, HHV.
Once metallised these substrates are cleaned and then coated with a photo resistive material using a spin coater. A laser writer is used to define different designs as required by customers on blank chromium mask plates. Once covered with a patterned mask plate the substrates go through ultra-violet exposure to harden exposed areas. HHV uses positive lithography to pattern and etch the metallised substrates.
A specialised etching room containing a chemical wet bench is used for multiple rounds of etching for each metallic layer. A dicing machine is then used to cut the metallised substrates to required sizes and an ISO 8 clean room is used to qualify the products. High performance microscopes and profile projectors are available for the inspection and measurement of the patterned substrates.
“The entire process requires high levels of precision and sophisticated technology to deposit coatings pattern the circuits and check the quality of the substrates within a 1000th of a millimetre. All these processes require clean room environments to ensure minimal interference with particle matter present in air. HHV’s Photo Lithography Lab has ISO 7 and ISO 8 clean rooms as well as class 100 laminar flow stations that allow us to achieve resolutions of up to 40 microns” added Prasanth Sakhamuri.
Established in 1965 at Bangalore as a specialised enterprise to develop Indian self-reliance in high vacuum technology, HHV today serves a spectrum of industries and R&D centres covering aerospace, atomic energy, defence, automotive, semi-conductors, electrical, horology, scientific instrumentation, decorative, food processing to name a few. HHV has an advanced research and manufacturing program in thin film technology, material science, metallurgy, astronomy, and special purpose machinery.
(Note: As Published in Industrial products finder: https://ipfonline.com/news/detail/industrynews/HHV_to_supply_thin_film_metallised_circuit_to_ISRO/9853 )