Abstract: An illuminating device for an electric part which can illuminate a light conducting member uniformly with a simple construction. The illuminating device comprises an annular filter having a light passing zone and a light absorbing zone formed at different circumferential portions thereof. The filter is located on a lower face of and positionable in a circumferential direction relative to a cylindrical light conducting member which surrounds a manually operable knob mounted for rotation relative to an operation panel. A light source is located below the light conducting member so that light emitted from the light source is transmitted to an upper end face of the operation panel by way of the filter and the light conducting member. The distribution of the light passing zone and the light absorbing zone of the filter is selected suitably so as to attain desired uniform illumination at the upper end face of the operation panel.

Abstract: There is disclosed a device for displaying the operation of a knob that is used for an automobile heater control unit, for example. The device has a frame in which a slider is mounted so as to be horizontally slidable. The knob is fixed to one end of the slider. A first light-conducting body that can be illuminated by a lamp to display the operation of the knob is so formed as to surround the slider and the knob. A second light-conducting body that can be illuminated by a second lamp to display the position of the knob is so mounted that the end of this body is located within the outer end surface of the knob. That is, the first light-conducting body is located around the second conducting body.

Abstract: An optical switch comprising an optical fiber member having its light sending end surface and light receiving surface bound closely in contact along a flat side of their ends, and a reflecting surface which is provided at the end surface of a swinging lever for switching ON and OFF the light reflecting condition where the light sent from the sending end surface is guided or not guided to the receiving end surface.

Abstract: Discloded is a light transmission device in which a plug is elastically urged toward an E-O converter element by a plug urging means provided between the plug and a receptacle of a light transfer device and in which a spacer is provided between the plug and the E-O converter element so that the end surface of the plug and the E-O converter element are separated from each other by a predetermined distance.

Abstract: A device for detecting rotating speed of a thin shape motor including a vertical shaft rotatably supported on a base plate, a rotor of a planar shape secured to the vertical shaft in a spaced apart relation from the base plate, and a stator provided downwardly from the rotor on the base plate, comprises a rotatable disc of a diameter smaller than that of the rotor secured to the vertical shaft and having speed detecting indices on a peripheral surface thereof, and a luminous element and a light-receiving element provided outwardly of the rotor. A light-projecting optical fiber and a light-receiving optical fiber are further provided to extend along the base plate such that one end of the light-projecting optical fiber is located to oppose the luminous element, while one end of the light-receiving optical fiber is located to oppose the light-receiving element, and that the other ends of the two optical fibers are placed in opposition to the peripheral surface of the rotatable disc.

Abstract: A light-reflective type rotary encoder used to measure the rotational frequency of a rotating shaft, the distance travelled by a sliding body, or other physical quantity has a casing body in which a rotor is rotatably held. Two input optical fibers laid parallel to each other and an output optical fiber laid between the input fibers are held in the casing body in such a way that each one end of these fibers is arranged in line and opposed to the fringe of the rotor on which reflective areas and non-reflective areas are alternately formed at regular intervals circumferentially. The other ends of the fibers which are disposed on the open end side of the casing body are surrounded and covered by a device-mounting case which is detachably mounted to the casing body and which holds a light-emitting device and light-receiving devices therein.