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Laser sound head esp. for sound film projector - has laser in tube with lens and two blinds which focus laser onto analogue or digital track on film and minimise distortion factor
Laser sound head esp. for sound film projector - has laser in tube with lens and two blinds which focus laser onto analogue or digital track on film and minimise distortion factor
The laser sound head (L) includes a unit [1] that has a cylindrical body within which is contained a laser diode [11]. The laser diode emits red light that passes through a collimator lens [10]. A further head section [12] has a cylinder lens [9] and an objective lens [13] that focuses the beam onto the film [F]. A blind/screen directs the beam onto narrow analogue or digital sound track. The two sections are connected by a bridging element. The transmitted image is received by a photo detector that can be a CCD array [D]. Two blinds/screens (8,15) minimise the distortion factor near the analog film scanner by diminishing the light intensity. Both blinds are pref. free-standing and made from machine cut sheet steel.
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