Optical low pass filter

An optical low-pass filter for use in front of a solid-state image sensor of an offset sampling structure wherein pixels are arrayed at a pitch Px in a horizontal direction and at a pitch Py in a vertical direction, and are shifted by an offset amount of Px/2 in the horizontal direction from the pixels of the adjacent rows, said optical low-pass filter comprising:

• a first optical member that splits an incident light ray into a rectilinear ray and a refracted ray whose propagation direction is about 45° or about −45° to the horizontal direction;
• and
• a second optical member that splits an incident ray into a rectilinear ray and a refracted ray whose propagation direction is about 90° or about −90° to the horizontal direction,
• wherein respective split widths D1 and D2 of the incident light rays through said first and second optical members satisfy the following conditions:
• D1=Px/2
• Py≦D2≦2·Py.

An optical low-pass filter for use in front of a solid-state image sensor of an offset sampling structure wherein pixels are arrayed at a pitch Px in a horizontal direction and at a pitch Py in a vertical direction, and are shifted by an offset amount of Px/2 in the horizontal direction from the pixels of the adjacent rows, said optical low-pass filter comprising:

• a first optical member that splits an incident light ray into a rectilinear ray and a refracted ray whose propagation direction is about 45° or about −45° to the horizontal direction;
• and
• a second optical member that splits an incident ray into a rectilinear ray and a refracted ray whose propagation direction is about 90° or about 90° to the horizontal direction,
• wherein said second optical member is bonded to a front side of said solid-state image sensor, and said first optical member is mounted in front of said second optical member.