| 摘要 |
PURPOSE:To prevent the shading, and also, to raise the purity of a color by constituting the title system so that a real image is not formed in an acousto- optical element in a cross section being vertical to the propagation direction of an ultrasonic wave, and the real image is formed only in a cross section being parallel to said propagation direction. CONSTITUTION:In a cross section being vertical to the propagation direction of an ultrasonic wave, the luminous flux which is emitted from one point of an object to be measured 101 goes to parallel rays by a collimator lens 103 consisting of a spherical lens and made incident on an acoustic filter 105, and by a Bragg diffracted light, a final real image 111 of specific wavelength is formed. Subsequently, in a cross section being parallel to the propagation direction of the ultrasonic wave, power of a cylindrical lens 104 is added, and the luminous flux from one point of the object 101 forms an intermediate real image 110 in the acousto-optical element 105 through a first slit diaphragm 102, the spherical lens 103 and a lens 104. Next, the luminous flux which is separated into spectral components by an ultrasonic wave forms a final real image 111 by a cylindrical lens 107 and a spherical lens 108. |
