Patent ID: 11940114
Assignee: OMRON CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC F  B  G | IPC B  F  G

Claim 14:
15. A light guide plate positioned in an xy plane and configured to guide light incident on an incidence surface of the light guide plate, change the optical path of the light, and emit the light from an emission surface to form an image comprising a first stereoscopic image and a second stereoscopic image in a space outside the light guide plate within a predetermined first angle range and a predetermined second angle range from a reference plane orthogonal to the xy plane,
the light guide plate comprising first optical-path deflectors and second optical-path deflectors comprising a group of optical-path deflectors that change the optical path of the light, wherein:
the first optical-path deflectors change the optical path of only the light incident on the light guide plate from a first light source arranged at a predetermined first position to form the first stereoscopic image in the space outside the light guide plate within the predetermined first angle range;
the second optical-path deflectors change the optical path of only the light incident on the light guide plate from a second light source arranged at a second position away from the first position, to form the second stereoscopic image in the space outside the light guide plate within the predetermined second angle range; and
the first optical-path deflectors and the second optical-path deflectors at least partially overlap with each other in a direction in which light incident from the first light source and the second light source is guided;
the first optical-path deflectors and the second optical-path deflectors are arranged such that the first stereoscopic image and the second stereoscopic image in the space appear the same or mutually similar when viewed from within the predetermined first angle range and the predetermined second angle range, and
the first stereoscopic image is formed in the space within the predetermined first angle range by the first light source and the second stereoscopic image is formed in the space within the predetermined second angle range by the second light source such that for set values of x, L, and W the light guide plate satisfies a system of inequalities expressed by:

90°−arctan(x/2L)>W; 

and

90°−arctan(x/L)>W, 

where L is an interval between the first light source and the second light source, x comprises a distance between a point on the incidence surface, through which the light enters the light guide plate, and the first and second optical-path deflectors, and W is the spread angle of the light from the first light source and the second light source.