CPC Main Group
G02B 27/00 Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
25 direct subcodes
Child Classifications
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- G02B 27/01 Head-up displays
- G02B 27/02 Viewing or reading apparatus (stereoscopic systems G02B30/00)
- G02B 27/09 Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B 27/10 Beam splitting or combining systems (polarising systems G02B27/28; mixing and splitting light signals using optical waveguides G02B6/28; )
- G02B 27/18 for optical projection, e.g. combination of mirror and condenser and objective
- G02B 27/28 for polarising (used in stereoscopes G02B30/25)
- G02B 27/30 Collimators
- G02B 27/32 Fiducial marks and measuring scales within the optical system
- G02B 27/40 Optical focusing aids
- G02B 27/42 Diffraction optics (G02B27/60 takes precedence)
- G02B 27/48 Laser speckle optics
- G02B 27/50 Optics for phase object visualisation