| 摘要 |
Rear end face films of a first device portion and a second device portion have a first reflective film in which one or a plurality of sets of a first rear end face film with a refractive index of n1 and a second rear end face film with a refractive index of n2 (>=n1) are layered on the rear end face; and a second reflective film in which one or a plurality of sets of a third rear end face film with a refractive index of n3 (<=n1) and a fourth rear end face film with a refractive index of n4 (>=n1) are layered on the first reflective film.
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