Abstract
A design is described regarding a new restitution instrument. Characteristics of the instrument are as following :
(1) non-tilting projectors of the instrument,
(2) fixed optical system,
(3) minimum elements of relative orientation: two swing, oneX-tilt of left projector, oneY-tilt of right projector andZ-motion.
Chosen the elements of orientation as (3), only one tilt about one axis for one projector is sufficient for the relative orientation, which simplify the mechanism of the instrument.To accomplih (1), the instrument is constructed as illustrated in Fig. 3 by means of the stereo-gram. In this figure, ABis a horizontal rotation axis about which a device ABCDEF is rotated. Two guid railsEF, CDare fixed to the device so that the carriagePQTUbe able to move along the rails. The carriage is moved by the guid rodGRwhich is through a sleeved pivotRfixed to the middle of the carriage. A short spindleTUattached also to the carriage, the endSof the guid rodSAmove along the spindle, another end of the rodSAis through the sleeved pivotHfixed to the negative carrier by a gimbal system.
The movementS, or the tilt of the rodSAregarding to the rodRG, corresponds to a tilt of the projector. The verification is shown in Fig. 5 and formula (1) - (6) .
