Paten Sensor “Foveon Like” Sony

2 Feb

Paten baru Sony mengenai sensor yang memiliki tiga warna. Deskripsi mengenai paten ini terdapat di situs freepatentsonline.  Paten “foveon like” yang mirip ini sebelumnnya juga telah dibikin oleh Sigma untuk produk kameranya.

Sigma sebagai satu-satunya perusahaan pembuat kamera saat ini yang menggunakan konsep mirip paten yang dimiliki oleh Sony. Produk kamera Sigma yang menggunakan konsep tersebut adalah  Sigma DP2s dan SD15.

Penjelasan lebih detil mengenai paten tersebut adalah sebagai berikut:
In recent years, in the CCD image sensor or the CMOS image sensor, since the size of a pixel decreases and the number of photons incident on a unit pixel decreases, sensitivity deteriorates and thus a decrease in S/N occurs. In widely used pixel arrangement where red, green, and blue pixels are arranged on a planar surface, for example, the Bayer arrangement using the primary color filters, green and blue light does not penetrate a color filter in red pixels and is not used in photoelectric conversion. Therefore, sensitivity may decrease. Moreover, when a color signal is formed by executing an interpolation process between pixels, a problem of a false color may arise.
In order to solve these problems, Japanese Unexamined Patent Application Publication No. 2007-12796 discloses a solid-state imaging device in which green, blue, and red photoelectric conversion units are laminated in a depth direction of the same pixel. In the solid-state imaging device, a blue photodiode (photoelectric conversion unit) and a red photodiode (photoelectric conversion unit) are formed in the depth direction in a silicon substrate. In addition, the solid-state imaging device includes an organic photoelectric conversion unit in which a green organic photoelectric conversion layer interposed between electrodes is formed on the upper layer of the front surface of the silicon substrate on the side of a light incident side with a wiring layer interposed therebetween. According to the configuration disclosed in Japanese Unexamined Patent Application Publication No. 2007-12796, since a light loss does not occur in the above-mentioned color filter, the sensitivity is improved. Moreover, since the interpolation process is not performed between pixels, a false color does not occur.

Sumber: Sony Alpha Rumors

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