Abstract: Weeding apparatus includes a concentrator assembly having a two-dimensional array of discrete semiconductor light emitters (2), e.g. laser diodes or LEDs. A primary optical stage (3) includes collimating lenses (4) each corresponding to one of the semiconductor light emitters (2) to collimate their light and produce a compound collimated beam. A secondary optical stage (5) incorporates a lens system arranged to convert the collimated beam into a convergent beam to concentrate the emitted light at a focal position. The concentrator assembly (1) may be incorporated in a weeding unit with a mechanical drive arrangement to direct the focal position onto a selected plant. A number of such weeding units maybe incorporated in a weeding module along with a control system. The weeding modules can be carried by an autonomous rover.

Abstract: Wireless power receiving apparatus (150) is retrofitted to a portable electrical device (100) to enable the device to receive power wirelessly. The apparatus comprises a power-receiving element (200) adapted to be attached to the device, e.g. by adhesive (201), and also being adapted to receive power wirelessly from a transmitter of power when the element and transmitter are in proximity with one another. One or more power connectors (203) are connected electrically to the power-receiving element and are adapted to be connected, when the apparatus is in use, to one or more corresponding power connectors (101) of the portable electrical device to deliver power received by the element to the device. The power-receiving element may be in the form of a sticker or may be carried by or incorporated in a replacement cover portion for the portable electrical device.