He admitted two counts of engaging in sexual activity in the presence of children. A judge on Tuesday called it a worrying case and jailed the defendant for 20 months.
The court also heard Deakin had been jailed for eight years in 2007 for attempted murder. His wife suffered 22 stab wounds after Deakin flew into a rage because he thought she was seeing another man.
At Mold Crown Court, the judge said exposure used to be "ridiculed" but recent events have shown it can be a precursor to more serious sexual offending. Prosecutor Laura Knightly said the incidents happened in Wrexham on June 10 and in Flintshire on October 9 this year.
In the first incident Deakin drove past two girls, aged eleven and 12, at 8.20am. He performed a sex act with his window down.
The girls felt scared and told their parents that evening, saidMs Knightly. Police investigated and found CCTV showing the defendant's van driving past the youngsters.
Police arrested the defendant at his home in Oswestry the following day. He gave no comment answers to questions. Then on October 9 two more girls aged ten and eleven were walking in Flintshire. They saw the defendant in a dark van looking towards them as he committed a sex act.
On another day the defendant's van was seen in the area and a member of the public passed its registration number to police. Deakin, who was on bail for the first offence, was arrested two days later. In statements the first victim said she felt frightened and avoids the area where she saw the van.
A second one said she feels scared when a car stops near her. Another said she avoids vans. Nicholas Williams, defending, said Deakin feels "remorse, regret and embarrassment" for the offences which were "noncontact" ones against the girls. Mr Williams claimed this is "quite an unusual" case.
He said: "He's not actually stopped his van. He was doing what he was doing as he drove past them. So, distressing though it would have been for them, in reality he would have been in their view for one or two seconds on each occasion." Footage shows "he's driving at what appeared to be normal speed past them". He added: "They are walking... The opposite way."
Mr Williams said Deakin, of Henley Close, Oswestry, lives with his partner of four years although their relationship has become "strained" lately. However his partner remains committed to standing by the defendant when he is released.
She and Deakin have researched his condition and concluded ...