Title:
OPTICAL DEVICE AND ELECTRONIC DEVICE
Document Type and Number:
Japanese Patent JP2015105990
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an electronic device configured to increase diffraction efficiency in a wide range of a field of view, to observe a large-size virtual image.SOLUTION: On a light incident surface of a light guide plate 200 formed of glass or light-transmissive resin material or the like, a first diffraction optical element 102, which is a surface-relief diffraction grating formed of SiN or the like, is arranged. A refraction index of the first diffraction optical element 102 is higher than that of the light guide plate 200. An image forming apparatus 500 makes TE-polarized image light 10 incident on the first diffraction optical element 102.
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Inventors:
YOKOYAMA OSAMU
Application Number:
JP2013247035A
Publication Date:
June 08, 2015
Filing Date:
November 29, 2013
Export Citation:
Assignee:
SEIKO EPSON CORP
International Classes:
G02B27/02; H04N5/64
Domestic Patent References:
| JP2012042955A | 2012-03-01 | |||
| JP2013228688A | 2013-11-07 |
Foreign References:
| US20090268295A1 | 2009-10-29 |
Attorney, Agent or Firm:
Akira Obayashi
Taro Takahashi
Taro Takahashi