光学装置、影像投影装置及电子机器;OPTICAL DEVICE, IMAGE PROJECTING APPARATUS, AND ELECTRONIC DEVICE

摘要

本发明提供一种光学装置，其用于影像投影装置，可藉由简易之构成显示高品质之图像。又，本发明提供一种影像投影装置，其具有此种光学装置，可显示高品质之图像。进而，本发明提供一种电子机器，其具有此种影像投影装置，可显示高品质之图像。;本发明之特征在于包括：导光板21；透过型之第1绕射元件31，其设置于导光板21之第1面21a，使于导光板21之内部传导之光之至少一部分绕射并将其撷取；透过型之第2绕射元件32，其设置于导光板21之第1面21a，使朝向导光板21之光之至少一部分绕射；及反射型之第3绕射元件33，其设置于导光板21之与第1面21a为相反侧之面即第2面21b，使经由第2绕射元件32入射至导光板21之内部之光之至少一部分绕射。; a first diffraction element that is a transmission type diffraction element provided on a first face of the light guide plate and that diffracts and ejects at least a portion of light which is guided along inside the light guide plate; a second diffraction element that is a transmission type diffraction element provided on the first face of the light guide plate and that diffracts at least a portion of light proceeding to the light guide plate; and a third diffraction element that is a transmission type diffraction element provided on a face which is an opposite face of the light guide plate from the first face, and that diffracts at least a portion of light which enters an inside of the light guide plate via the second diffraction element.