Customised motorisation of camera lenses

Sirris is helping a company to motorise the lenses of mini-cameras for remotely controlling images.

Traditional cameras are increasingly often being replaced in certain applications by mini-cameras, inexpensive and yet of good quality, to multiply the shots. These devices have to be calibrated so that their colours are in conformity with those seen by traditional TV or cine cameras.

To achieve optimal images from mini-cameras, CyanView has developed a remote control panel, with IP connection. This product called Cy-RCP has already been used for the French programme Fort Boyard (22 mini-cameras) or to support production of the TV Ninja Warrior game. Cars in the Le Mans 24 Hours are also equipped with cameras controlled by CyanView.

To perform this remote adjustment work, the lenses of the mini-cameras have to be motorised. Now there are many lenses on the market and news ones are often appearing. So it is difficult to invest in a plastic injection mould for producing parts for these devices.

CyanView consulted Sirris to see how to customise the mechanics of motorisation without accepting large investments for manufacturing moulds.

For the company Sirris developed a system of mini-motors for actuating the adjusting rings of a lens. The transmission is produced by two standard pinions on the motors and two customised graduated rings. Additive manufacturing technology was chosen.

It had to be verified whether a gearset produced by polymer powder sintering (SLS) could satisfy the specifications. Sirris studied pinion toothing and pitch compatible with polyamide 3D printing, given the difficulty that the surface finish is not very precise.

Since additive manufacturing allows parts to be made complex without extra cost, the sensors, screws and other functions were integrated in the unit.

As the printed parts are relatively small, additive manufacturing remains competitive, even for runs of some tens of parts.

After validation, Sirris supplied Cyanview with configurable CAD files that the company can modify itself according to new lenses appearing on the market and which it can transfer to its choice of printer.

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