Flash tube simmer circuitry for a film video player electronic s

Details Flash tube simmer circuitry for a film video player electronic s Flash tube simmer circuitry for a film video player electronic s

1985-05-03

1986-11-18

Hix, L. T.

Facsimile and static presentation processing

Facsimile

Recording apparatus

315101, 315107, 315241S, H04N 336, H05B 4114

Patent

active

046239294

ABSTRACT:
A film video player includes an electronic strobe light operable for repetitively firing a flash tube, to flash illuminate a solid state image sensor via a high-intensity light pulse projected onto photographic film at the vertical retrace rate of a standard television signal. A current sink circuit is provided for drawing a flash tube simmer current, to maintain an arc in the flash tube between sensor-illuminating pulses. Sensing circuitry, coupled to a junction common to the flash tube and the current sink circuit, produces a control signal corresponding to whether or not the flash tube is conducting simmer current. Switching circuitry, responsive to the control signal at the vertical retrace rate, (1) causes the overriding of the operation of a flash tube trigger circuit when the control signal indicates that the flash tube is conducting simmer current, and (2) causes the operating of the trigger circuit when the control signal indicates that the flash tube is not conducting simmer current. By providing for the triggering of the flash tube only when the simmer current is off, electromagnetic interference, which is produced by the flash tube trigger voltage and which can adversely affect the video display signal, is minimized.

REFERENCES:
patent: 4158793 (1979-06-01), Lewis
patent: 4495516 (1985-01-01), Moore et al.
patent: 4506300 (1985-03-01), Fearnside

Affiliated with

Also associated with

Rating

Flash tube simmer circuitry for a film video player electronic s does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Flash tube simmer circuitry for a film video player electronic s, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flash tube simmer circuitry for a film video player electronic s will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1620387