Optical device, image display apparatus and head-mounted display unit

摘要

Disclosed herein is an image display apparatus, including: a light source; and a scanning section adapted to scan a light beam emitted from the light source; the scanning section including (a) a first mirror, (b) a first light deflection section, (c) a second mirror, and (d) a second light deflection section; the second light deflection section including an external light receiving face; the second light deflection section having a plurality of translucent films provided in the inside thereof; the translucent films having a light reflectivity R2 at a wavelength of the light beam which satisfies: R2≦k×{(P2/t2)×tan(ζ2)}1/2 where k is a constant higher 0 but lower than 1, P2 an array pitch of the translucent films, t2 a thickness of the second light deflection section, and ζ2 an angle formed between the light emitting face and the translucent films.

主权项

1. An image display apparatus, comprising:
a light source configured to generate light in at least one range of wavelengths within a wavelength band, and without generating a substantial amount of light in a remainder of the wavelength band; and a light scanning section configured to scan the light emitted from said light source; wherein said light scanning section comprises
a first deflection portion configured to deflect the light emitted from the light source, anda second deflection portion configured to deflect the light deflected by the first deflection portion, wherein said second deflection portion comprises a plurality of translucent films, wherein each of said plurality of translucent films is configured so that an average light reflectivity value of the film in the remainder of the wavelength band is lower than an average light reflectivity value of the film in the at least one range of wavelengths, wherein said translucent films comprise a first plurality of films of a first material alternately laminated with a second plurality of films of a second material that is different than the first material, and wherein each of the first plurality of films is thinner than and has a lower refractive index than each of second plurality of films that is adjacent thereto.