| 摘要 |
PURPOSE: To eliminate the infiltration of the magnetism generated by an image forming means into a magnetism shielding space and to make a liquid crystal projector, CRT, etc., usable by installing an image forming means for forming an image for stimulating visual sensation in order to elucidate the nerve activity of the brain at the outside of the magnetism shielding space. CONSTITUTION: A testee 10 wearing a SQUID sensor 12 is put into the inside cylinder 11 of a superconducting magnetism shield and the image light emitted from the liquid crystal projector 13 as the image forming means capable of displaying the image at a high speed is cast as parallel beams 16 through an objective lens (group) 14 and a relay lens (group) 15 into the aperture of the inside cylinder 11. The parallel beams 16 are passed through an imaging lens (group) 17 and is imaged onto a screen 18 held in the specified position. with respect to the testee 10. When the testee 10 assumes an opposite posture, the screen 18 moves according thereto and the imaging lens (group) 17 to be formed on the screen 18 moves in the same manner so as to maintain the specified position. |
