Abstract: A display selection button 10 comprises a light projecting unit 21, a light guide plate 13, a plurality of light receiving units 22, and a control unit 30. The light guide plate 13 has an incident surface 13a, a plurality of prisms 13d that reflect incident light toward the side approached by a finger and are provided at positions corresponding to push buttons 10c, and an exit surface 13b that emits the light reflected by the prisms 13d in the direction in which the finger approaches or touches. The light receiving units 22 are provided at positions corresponding to the push buttons 10c and receive light reflected from a finger approaching a push button 10c. The prisms 13d reflect light so as to compensate for the amount of light that decreases depending on the distance from the light projecting unit 21.

Abstract: A display selection button 10 comprises a light projecting unit 21, a light guide plate 13, a light receiving units 22, a control unit 30, and LED 23,24. The light guide plate 13 has an incident surface 13a to which the light emitted from the light projecting unit 21 is incident, a plurality of prisms 13d that reflect incident light toward the side approaching or touching a finger and are provided at positions corresponding to push buttons 10c, and an exit surface 13b that emits the light reflected in the direction in which the finger approaches. The light receiving units 22 receive light emitted from the exit surface 13b and reflected from a finger. The control unit 30 detects the approach of a finger depending on the amount of light received by the light receiving units 22. The light guide plate 13 has the plurality of the prisms 13e that reflect the incident light and displays the desired design.

Abstract: A display selection button 10 comprises a light projecting unit 21, a light guide plate 13, a light receiving units 22, a control unit 30, and a printed sheet 14 and a LED 25. The light guide plate 13 has an incident surface 13a to which the light emitted from the light projecting unit 21 is incident, a plurality of prisms 13d that reflect incident light toward the side approaching or touching a finger and are provided at positions corresponding to push buttons 10c, and an exit surface 13b that emits the light reflected in the direction in which the finger approaches. The light receiving units 22 receive light emitted from the exit surface 13b and reflected from a finger. The control unit 30 detects the approach of a finger depending on the amount of light received by the light receiving units 22. The printed sheet 14 displays the desired numerals. The LED 25 emits light for displaying the desired numerals in the printed sheet 14.

Abstract: A display selection button 10 comprises a light projecting unit 21, a light guide plate 13, a plurality of light receiving units 22, and a control unit 30. The light guide plate 13 has an incident surface 13a to which the light projected from the light projecting unit 21 incident, a plurality of prisms 13d that reflect incident light toward the finger side and are provided at positions corresponding to push buttons 10c, and an exit surface 13b that emits the light reflected in the direction in which the finger approaches. The light receiving units 22 are provided at positions corresponding to the push buttons 10c and receive light reflected from a finger. The light receiving unit 22 have higher detection sensitivity as a distance from the light projecting unit 21 increases so as to compensate for the amount of light that decreases depending on the distance from the light projecting unit 21.

Abstract: A push button switch includes a push button, a movable contact that moves together with the push button, and a fixed contact with respect to which the movable contact comes into contact or separates in accordance with the operation of the movable contact. The push button switch includes a light emitting element, and a light receiving element. A light emitting position where light emitted from the light emitting element is radiated to the outside, and a light receiving position where light detected by the light receiving element is received from the outside are disposed outward of an edge of the push button when viewed in a pushing direction. The light receiving element is disposed to detect light emitted from the light emitting element and reflected by an object in a detection region set in a space on the push button side in the opposite direction to the pushing direction.

Abstract: A push button switch 1 comprises: a push button 10 that can be pushed in; a movable contact 120 that is linked to the push button 10; and a fixed contact 121 that comes into contact with or separates from the movable contact 120 by operation of the movable contact 120. The push button switch 1 further comprises a light-emitting element 130 for emitting light, and a light-receiving element 131 for detecting light. The light-receiving element 131 is disposed so as to detect the light emitted from the light-emitting element 130 and reflected by an object within a prescribed region. The push button switch 1 outputs an ON signal if the push button 10 has been pushed in, thereby causing the movable contact 120 to come into contact with the fixed contact 121, or if it is determined that the light-receiving element 131 has detected light reflected by an object.

Abstract: A limited reflection type sensor which irradiates exit light from a light emitting unit toward an object sensing region through an exit light lens and receives, at a light receiving unit, reflected light from an object existing in the object sensing region through a reflected light lens, may include a casing including a latching portion formed on a side surface and a first opening facing the object sensing region, the casing accommodating the light emitting unit and the light receiving unit; and a lens part including a light incident/exit part formed integrally with the exit light lens and the reflected light lens, and a side surface covering part in which an end of the light incident/exit part is extended along the side surface, in which the lens part covers the first opening with the light incident/exit part and the side surface covering part is latched by the latching portion.