Claims
- 1. A metal oxide semiconductor (MOS) type solid-state image sensor comprising:an n type semiconductor substrate; at least one first p well area provided in a surface portion of the n type semiconductor substrate; a plurality of second p well areas selectively provided at a surface portion of the first p well area and having a higher p type impurity concentration than the first p well area; at least one third p well area provided in the surface portion of the n type semiconductor substrate and spaced a predetermined distance from the first p well area; an image pickup area comprising a two-dimensional array of row and column unit cells having a photoelectric conversion section provided in the first p well area and a signal scanning circuit section in the second p well areas; a plurality of signal lines respectively reading out signal charges from the unit cells in the image pickup area; and a peripheral circuit area formed in the third p well area.
- 2. A MOS type solid-state image sensor according to claim 1, wherein a first n well area is formed in the third p well area.
- 3. A MOS type solid-state image sensor according to claim 2, wherein the first n well area is equal in depth to, or greater in depth than, the first p well area.
- 4. A MOS type solid-state image sensor according to claim 2, further comprising a second n well area formed in the surface portion of the n type semiconductor substrate at an area between the first p well area and the third p well area and having a higher n type impurity concentration than the substrate.
- 5. A MOS type solid-state image sensor according to claim 4, wherein the second n well area is grounded.
Priority Claims (1)
Number |
Date |
Country |
Kind |
10-317833 |
Nov 1998 |
JP |
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Parent Case Info
This is a divisional of Application No. 09/435,464, filed Nov. 8, 1999, now U.S. Pat. No. 6,403,998, which is incorporated herein by reference.
US Referenced Citations (8)
Foreign Referenced Citations (4)
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62-023156 |
Jan 1987 |
JP |
4-30472 |
Feb 1992 |
JP |
10-12855 |
Jan 1998 |
JP |
10-150182 |
Jun 1998 |
JP |