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http://techon.nikkeibp.co.jp/atclen/news_en/15mk/122000258/
Olympus Integrates Visible, Infrared Image Sensors
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Tetsuo Nozawa, Dec 21, 2015
Olympus Corp developed a device by integrating a color visible-light image sensor and a near-infrared image sensor.
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Olympus used a lamination technique to stack them. The company made this announcement Dec 9, 2015, at IEDM 2015 (thesis number 30.1).
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The device is expected to be used for (1) medical purposes such as examination of veins under skin with a near-infrared sensor and pathological examination of living tissues with a fluorescent material, (2) security applications such as vein authentication and (3) distance measurement based on the time difference between irradiation and reception of infrared light.
ÀÌ ÀåÄ¡´Â (1) ±ÙÀû¿Ü¼± ¼¾¼¸¦ ÀÌ¿ëÇÑ ÇÇÇÏ Ç÷°üÀÇ ½ÃÇèÀ̳ª Çü±¤¹°ÁúÀ» ÀÌ¿ëÇÑ »ýüÁ¶Á÷ÀÇ º´¸®ÇÐÀû ½ÃÇè µîÀÇ ÀÇ·áÀû ¸ñÀû°ú (2) Ç÷°üÀÎ½Ä µîÀÇ º¸¾È ¸ñÀû (3) Àû¿Ü¼±ÀÇ ¹æ»ç-¼ö½Å ½Ã°£Â÷¸¦ ÀÌ¿ëÇÑ °Å¸®ÃøÁ¤ µî¿¡ »ç¿ëµÉ ¼ö ÀÖÀ» °ÍÀ¸·Î º¸ÀδÙ.
The laminated image sensor is made by combining (1) an image sensor equipped with an RGB color filter for visible light (top layer) and (2) a near-infrared image sensor (bottom layer). Each layer functions as an independent sensor and independently outputs video signals.
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The visible-light image sensor is a backside-illuminated type, and its light-receiving layer (made of semiconductor) is as thin as 3μm. Each pixel measures 3.8 x 3.8μm, and the number of pixels is 4,224 x 240.
°¡½Ã±¤¼± ´ë¿ªÀº À̸éÁ¶»ç(BSI) Çü½ÄÀ̸ç, ¹ÝµµÃ¼·Î Á¦ÀÛµÈ °¨±¤¿µ¿ªÀÇ µÎ²²´Â 3¸¶ÀÌÅ©·Î Á¤µµÀÇ µÎ²²ÀÌ´Ù. °¢ Çȼ¿Àº 3.8x3.8 ¸¶ÀÌÅ©·Î¹ÌÅÍÀ̸ç, ¼¾¼ÀÇ Çȼ¿ ¼ýÀÚ´Â 4,224 x 240 Çȼ¿ÀÌ´Ù. (¿ªÁÖ : 3.8¸¶ÀÌÅ©·Î¹ÌÅÍÀÇ Çȼ¿ÇÇÄ¡´Â 1600¸¸ È¼Ò ¸¶ÀÌÅ©·ÎÆ÷¼µå ¼¾¼ Á¤µµÀÔ´Ï´Ù.)
One of the concerns about such a laminated type is that infrared light becomes a noise for visible-light images. In many cases, conventional visible-light image sensors remove the influence of infrared light on visible-light images by using an infrared filter.
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This time, Olympus dispelled such concerns by reconstituting visible-light images without infrared components based on signals output from the top and bottom layers, the company said.
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