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

Claim 0:
1. 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 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 a group of optical-path deflectors that change the optical path of the light, wherein
the group of optical-path deflectors:
deflects the light incident on the light guide plate from a first light source arranged at a predetermined position to form a first stereoscopic image in the space within the predetermined first angle range with respect to the reference plane that is orthogonal to the emission surface and parallel to a side surface of the light guide plate; and
deflects the light incident on the light guide plate from a second light source arranged at a position away from the position of the first light source, to form a second stereoscopic image in the space within the predetermined second angle range with respect to the reference plane,

the first angle range and the second angle range are separate from each other or adjoining each other,
the group of 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 the first angle range and the 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 the 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 the incidence surface, through which the light enters the light guide plate, and the group of optical-path deflectors, and W is the spread angle of the light from the first light source and the second light source.