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GOLDEN SCAN 3 - MIRROR UNIT |
Clay Paky's long standing mechanical design expertise and
Pulsar's unparalleled control electronics know-how, both accumulated in
the professional show-lighting sector, have enabled us to develop the
ultimate in microstepping motor technology. As a results, the Golden Scan
3 light beam can be positioned with exceptional accuracy, total control
and no speed or excursion limits.
The moving mirror is highly reflective, reducing the loss of light
output efficacy to negligible values.
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Its perfectly flat surface is very
large to ensure it reflects the entire light beam projected by the
luminire, even when the Frost filter and prism are inserted and
irrespective of wheter the wide-angle lens is used or not. The mirror is
moved by two microstepping motors with a pan movement of 150° and a tilt
movement of 110°. The possibilities of positioning the light beam in
relation to the scene are increased still further by the possibility of
easily rotating the mirror head through 360° on the luminaire body.
Completing this flexibility, the Golden Scan 3 features a device for
reversing the movement of the mirror. This makes it possible to switch
straight from symmetrical to asymmetrical movements, in conjunction with
other lights, without the need for time-consuming changes to their control
programs. Thanks to all these devices, the Golden Scan 3's installation,
centering and programming operations are fairly simple to carry out, above
all in touring applications, since the movement of the mirror is virtually
independent from its position on the luminaire body.
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| The speed at which the mirror moves can be selected as
desired from a wide range of values, extending from an infinitesimal
minimum value to a maximum pan value of 0.4 s/150° and a maximum tilt
value of 0.3 s/110°. The most surprising aspect of the Golden Scan 3's
performance, however, is its smooth, even movement, which is particularly
noticeable at low speeds. The effective mirror rotation resolution is thus
0.6° for the pan action (150°/256) and 0.4° for the tilt action
(110°/256). Thanks to this, in the worst case, the light beam could be
0,3° or 0,2° from the required position for pan and tilt respectively. A
sophisticated algorithm in the control software developed by Pulsar has in
fact made it possible to double the microstepping resolution.
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