Optical module and imaging device

An imaging device comprising:

• a lens (21);
• an optical module (10), wherethrough light from the lens (21) transmits;
• a first polarizer (22) for adjusting the polarization plane of the light entering into the optical module (10);
• a second polarizer (23) for polarizing and separating the light being emitted from the optical module (10);
• and
• a photodetector (24) for detecting light emitted from the second polarizer (23),
• wherein the optical module (10) comprises:
• a first plate-like optical element (4) formed with a ¼ wavelength plate portion (1) and a −¼ wavelength plate portion (2), the ¼ wavelength plate portion (1) and the −¼ wavelength plate portion (2) alternately being jointed together at a joint portion (3);
• and
• a second plate-like optical element (8) formed with a ¼ wavelength plate portion (5) and a −¼ wavelength plate portion (6), the ¼ wavelength plate portion (5) and the −¼ wavelength plate portion (6) alternately being jointed together at a joint portion (7),
• wherein the first optical element (4) and the second optical element (8) are parallel,
• wherein the ¼ wavelength plate portion (1) of the first optical element (4) and the −¼ wavelength plate portion (6) of the second optical element (8) are overlapped across a gap (9), and
• wherein the −¼ wavelength plate portion (2) of the first optical element (4) and the ¼ wavelength plate portion (5) of the second optical element (8) are overlapped across the gap (9), or
• wherein the optical module (10) comprises:
• a first plate-like optical element (4) formed with a ¼ wavelength plate portion (1) and a −¼ wavelength plate portion (2), the ¼ wavelength plate portion (1) and the −¼ wavelength plate portion (2) alternately being jointed together at a joint portion (3);
• and
• a second plate-like optical element (8) formed with a ¼ wavelength plate portion (5) and a −¼ wavelength plate portion (6), the ¼ wavelength plate portion (5) and the −¼ wavelength plate portion (6) alternately being jointed together at a joint portion (7),
• wherein the first optical element (4) and the second optical element (8) are parallel,
• wherein the ¼ wavelength plate portion (1) of the first optical element (4) and the ¼ wavelength plate portion (5) of the second optical element (8) are overlapped across a gap (9), and
• wherein the −¼ wavelength plate portion (2) of the first optical element (4) and the −¼ wavelength plate portion (6) of the second optical element (8) are overlapped across the gap (9).