Theatre Design & Technology - Dec 1970 - 11

are installed around the four sides of the hall and
two red Helium Neon lasers are grouped in the
center of the ceiling. The mirrors are installed in
four groups, each providing rotation, deflection, and
dispersion. For example, the stage center mirrors,
placed on a trolley in four groups, reflect laser
beams vertically or horizontally. The 32 laser movement patterns are, therefore, achieved by careful
combination of mirror movements. The daily program offers concerts of modern musical composition by Takemitsu, Yuji Takahashi, and Xenaxis.
The Hitachi Pavilion demonstrates laser color
TV projection. This experimental system is designed to produce color images on a large screen
by picking up signals either directly from a color
television camera or through the standard broadcasting system. Laser beams of extreme brightness and small divergence project sharp, clear
images on a large screen. Compared with conventional devices such as the Eidphor, or the light
tube method, the laser system is capable of producing much brighter images with better image
resolution. While the laser TV projection system
of the demonstration in Expo has the same image
resolution as ordinary television systems, the resolution can be improved simply by increasing the
rotation speed of the scanning mirrors. Basically,
the laser color television projector is composed of
three lasers in the three primary colors-blue,

@ill] THEATER DESIGN AND TECHNOLOGY

DECEMBER. 1970

green, and red. The system first picks up television
signals boosted by a newly developed video amplifier, and then three light modulators impress the
amplified television signals on the three laser
beams, which are combined into a single beam as
they pass through a set of dichroic mirrors. The
combined beam proceeds to the second mirror
system-a team deflection system-consisting of
a horizontal scanner with 1 6 mirror facets and a
vertical scanner with 24 mirrorfacets. Thescanners
rotate at constant speeds, the former at 60,000
r.p.m., the latter at 150 r.p.m. The laser beam
first reflects onto the 16-faceted mirror and is
horizontally deflected. Then, it undergoes vertical
deflection as it is thrown onto the 24-faceted
mirror. The deflected laser beam, as it falls on a
large screen, draws an image composed of 525
scanning Iines per frame. The image thus produced
is much brighter than that from the regular cathode
ray tube.
The adjustment of the color contrast is accomplished by regulating the power output of the laser
beams. Since the blue laser is set at 4880 degree
A, instead of the ideal vicinity of 4600 degree A,
the projected image tends to be greenish. But
when the problem of balanced color contrast is
solved and when it becomes commercially available,
a wide range of applications is expected, including
the theatre.

11



Table of Contents for the Digital Edition of Theatre Design & Technology - Dec 1970

Contents
Theatre Design & Technology - Dec 1970 - 1
Theatre Design & Technology - Dec 1970 - 2
Theatre Design & Technology - Dec 1970 - 3
Theatre Design & Technology - Dec 1970 - Contents
Theatre Design & Technology - Dec 1970 - 5
Theatre Design & Technology - Dec 1970 - 6
Theatre Design & Technology - Dec 1970 - 7
Theatre Design & Technology - Dec 1970 - 8
Theatre Design & Technology - Dec 1970 - 9
Theatre Design & Technology - Dec 1970 - 10
Theatre Design & Technology - Dec 1970 - 11
Theatre Design & Technology - Dec 1970 - 12
Theatre Design & Technology - Dec 1970 - 13
Theatre Design & Technology - Dec 1970 - 14
Theatre Design & Technology - Dec 1970 - 15
Theatre Design & Technology - Dec 1970 - 16
Theatre Design & Technology - Dec 1970 - 17
Theatre Design & Technology - Dec 1970 - 18
Theatre Design & Technology - Dec 1970 - 19
Theatre Design & Technology - Dec 1970 - 20
Theatre Design & Technology - Dec 1970 - 21
Theatre Design & Technology - Dec 1970 - 22
Theatre Design & Technology - Dec 1970 - 23
Theatre Design & Technology - Dec 1970 - 24
Theatre Design & Technology - Dec 1970 - 25
Theatre Design & Technology - Dec 1970 - 26
Theatre Design & Technology - Dec 1970 - 27
Theatre Design & Technology - Dec 1970 - 28
Theatre Design & Technology - Dec 1970 - 29
Theatre Design & Technology - Dec 1970 - 30
Theatre Design & Technology - Dec 1970 - 31
Theatre Design & Technology - Dec 1970 - 32
Theatre Design & Technology - Dec 1970 - 33
Theatre Design & Technology - Dec 1970 - 34
Theatre Design & Technology - Dec 1970 - 35
Theatre Design & Technology - Dec 1970 - 36
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