Projection-type optical module

A modular optical apparatus comprising:

• a screen disposed inside a vehicle;
• an optical system disposed inside the vehicle, the optical system including a plurality of lenses and configured to output light rays for forming an image;
• a first reflective mirror configured to reflect the light rays from the optical system;
• and
• a second reflective mirror configured to reflect the light rays reflected by the first reflective mirror again and project the image onto the screen,
• wherein the plurality of lenses comprise six lenses arranged sequentially, and
• wherein the six lenses, along a sequence starting from the screen in a direction away from the screen, comprise
• a first lens having a negative refractive power,
• a second lens having a positive refractive power,
• a third lens having a negative refractive power,
• a fourth lens having a negative refractive power,
• a fifth lens having a positive refractive power, and
• a sixth lens having a positive refractive power.

A modular optical apparatus comprising:

• a screen disposed inside a vehicle;
• an optical system disposed inside the vehicle, the optical system including a plurality of lenses and configured to output light rays for forming an image;
• a first reflective mirror configured to reflect the light rays from the optical system;
• and
• a second reflective mirror configured to reflect the light rays reflected by the first reflective mirror again and project the image onto the screen,
• wherein the plurality of lenses comprise six lenses arranged sequentially, and
• wherein the six lenses, along a sequence starting from the screen in a direction away from the screen, comprise
• a first lens having a negative refractive power,
• a second lens having a positive refractive power,
• a third lens having a negative refractive power,
• a fourth lens having a negative refractive power,
• a fifth lens having a positive refractive power, and
• a sixth lens having a positive refractive power, wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens comprise plastic, and the sixth lens comprises glass, wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens comprise aspherical surface, and wherein the sixth lens comprises a spherical surface.