SPECTRAL IMAGE DEVICE

PURPOSE:To easily form the image of equal size and the image of equal intensity by providing an optical amount where plural image branching optical parts for dividing the image are fixed and arranged to satisfy a specified optical condition and an optical path change finely adjusting device which adjusts the fine deviation of an optical path made incident on a video device. CONSTITUTION:The image is branched by a half mirror mount 3, a half mirror 4 and a total reflection mirror 5 which are integrated to be formed as a device. The optical path finely adjusting device 10 is provided with a clockwise and counterclockwise rotating frame 19 supported to a fixed frame 18 by a pair of up-and-down clockwise and counterclockwise rotating shafts 21 and 21 inside the frame 18. Then, a thick quartz plate 23 is fitted in the frame 19. The emitted position of the light made incident on the plate 23 is changed according to the tilt angle and the refractive index of the quartz plate, but the refractive index is constant, so that the optical path is optionally changed corresponding to the tilt angle and the deviation of the optical path made incident on the video device 12 is corrected. Thus, the deviation of the optical path is easily adjusted and the work of forming the sized image is facilitated.