Abstract: Provided is a method for peeling a PSA sheet adhered on a polarizing plate. The PSA sheet has a PSA layer. The PSA layer includes a layer A forming at least one surface of the PSA layer. Of the polarizing plate, the surface to which the PSA sheet is adhered is corona-treated or plasma-treated. The peeling method includes a water-peel step in which the PSA sheet is peeled from the polarizing plate, in a state where an aqueous liquid exits at the interface between the polarizing plate and the PSA sheet at the front line of peeling the PSA sheet from the polarizing plate, with the aqueous liquid allowed to further enter the interface following the movement of the peel front line.

Abstract: A solid-state imaging element having an array of light receiving pixels is disclosed. A light receiving pixel includes a pair of photoelectric conversion units, a first separation region, and a second separation region. The pair of photoelectric conversion units is disposed adjacent to each other and has a shared floating diffusion (FD). The first separation region surrounds the pair of photoelectric conversion units. The second separation region is disposed between the pair of photoelectric conversion units. The first separation region has a rectangular shape in plan view and extends from a surface on the opposite side to a light incident surface of the semiconductor layer toward the light incident surface. The second separation region is disposed along a diagonal line of the first separation region extends from the surface on the opposite side to the light incident surface of the semiconductor layer toward the light incident surface.