Switching functions such as for windshield wiper control in a vehicle are remotely controlled by a manually positioned optical selector connected through a fiber optic conductor to an electro-optic transceiver. The transceiver provides a light source for illuminating the light conductor and the selector controls the positions of color coated mirrors which are selectively positioned to reflect color coded light via the light conductor to the transceiver which analyzes the modified light spectrum. A logic circuit responsive to the transceiver output controls actuators according to the selected switch function.

A touch-sensitive key particularly for use in a fibre-optic system has a radiation propagating unit (3) with a touching surface (5). Radiation input and output devices, such as optical fibres (1, 2), are arranged respectively to direct radiation at the touching surface (5) through the unit (3) and to receive such radiation scattered from the touching surface (5) through the unit (3). The unit (3) incorporates a radiation collecting arrangement to reduce radiation losses between the input and output devices. In one embodiment this arrangement is achieved by using a unit (3) in the form of an optical-fibre light guide. In a further embodiment the unit (9) has a suitably curved touching surface (10) which has a focusing action. In other embodiments focusing mirrors (19, 22) are used. In order to discriminate between internal radiation and external radiation entering the unit, air gaps (4, 14, 21, 26) may be provided e.g. between the output device and the unit, and also radiation-absorbing material (15, 28, 27).

Bathing systems with electronic and optionally microcomputer control of optionally multiple functions, user safety being assured by fibre-optic remoting techniques. Systems include electrically safe optical control means to be positioned in or proximate to the bathing location, this location being a swimming pool, bathtub, whirlpool bath, shower, bidet, or similar installation. These systems also include such valves, pumps, pulsation-causing devices, water conditioning devices, and the like, as may be required by any of the multiple functions that may be desired, all of these devices being under the control of a single electronic controller responsive to the optical control means at the bathing location, and also responsive to various water condition sensors. The optical control means includes a light altering mechanism, preferably an optical touch switch such as might be operated by light reflected from the user's finger, this mechanism being connected by fibre optic tube means to a remote light source and detector; it may also include a display means such as optical fibres or fibre bundles carrying light from remote light sources indicating water or other conditions known by the electronic controller. The electronic controller preferably includes a microcomputer because of the ease with which microcomputers can handle many input variables and many possible output functions, for the optimization of both comfort and efficiency of the bathing installations. For simplicity of installation, fibre optic tube means are preferably incorporated into the water-carrying plastic pipe.

The invention relates to a joystick control unit featuring a joystick shaft member with a reflective surface on its bottom portion which is parallel to the X-Y plane when the shaft is placed in a centered upright position. The reflective surface tilts as the shaft member is moved through the X-Y plane and reflects the radiant energy emitted from a source mounted beneath the shaft member and directs it towards a plurality of radiant energy detectors selectively arranged beneath the reflective surface. The shaft member includes a movable inner member with at least one aperture in an upstanding sidewall which selectively permits or prevents the transmission of radiant energy through the aperture for purposes of controlling a switch function.

The present invention teaches a touch activated switch. The switch comprises a light source for generating a light ray. Further, the switch comprises a first lens for collimating the light source's light ray. The first lens, as a result, generates a collimated light ray in a first direction. In a second direction, the first lens forms a first and a second focal point, such that the light source is positioned at the first focal point. Moreover, the switch comprises a second lens for converging the collimated light ray to a surface. This surface scatters the collimated light ray in the direction of the first lens when the surface is substantially touched. The switch also comprises a detector for detecting the collimated light ray which have been scattered by touching the surface, with the detector being positioned at the second focal point, such that the switch is activated in response to touching the surface.