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    • 7. 发明申请
    • OPTICAL DEVICE, METHOD FOR MANUFACTURING OPTICAL DEVICE, AND IMAGE DISPLAY DEVICE
    • US20230133805A1
    • 2023-05-04
    • US17906538
    • 2021-03-09
    • SONY GROUP CORPORATION
    • ATSUSHI TAKAHASHI
    • F21V8/00G02B27/42
    • The object of the present invention is to provide an optical device capable of easily making a sum of grating vectors of optical elements disposed on a light guide plate zero and realizing further improvement of optical characteristics, and a method for manufacturing the optical device.
      An optical device (100) of the present invention includes: a light guide plate (1) that totally reflects and guides incident light; a first optical element (5) that is disposed on the light guide plate (1); an input optical element (2) that is disposed on the light guide plate (1) and introduces the incident light into the light guide plate; a second optical element (3) that is disposed on the light guide plate (1) and bends light propagated by total reflection in the light guide plate, in a direction different from a direction of the light; and
      an output optical element (4) that is disposed on the light guide plate (1) and emits light propagated by total reflection in the light guide plate, to an outside of the light guide plate. The first optical element (5) has substantially the same grating vector as a grating vector of the input optical element (2), and the first optical element (5) and the input optical element (2) are disposed to face each other with the second optical element (3) interposed therebetween.