Pulnix TM-76 Manual de instrucciones descargar pdf (Pagina 24)

Page 18

Operation Mode

TM-75/76 High-Resolution CCD Camera

5.3 Snapshot Reset-Restart Shutter (Donpisha Shutter)

In this mode the shutter trigger pulse (TRIG) should be 150 nsec (two pixel clock) or wider. Snapshot

mode is similar to Pulse Position mode. However the leading edge of TRIG pulse in snapshot mode

immediately produces discharge pulse without delay (means Donpisha= no delay) and starts exposure,

which enables very high speed shutter up to over 1/1,000,000 sec (1 µsec exposure). It can, in theory, go

to a 70 nsec exposure time.

The transfer (read out) occurs at 9.5H (TM-76 is 14.5H) line from VD (R-R VD) leading edge.

TRIG pulse timing can be anywhere. However, when the pulse is generated during active video period,

white noise of the pulse location may appear (faster than 1/1000 sec shutter is inside Vertical blank

period and no noise will be seen).

FIGURE 12. Donpisha Timing

EXT. VD (R-R)

TRIG

Discharge

Transfer Gate

Accumulation

(Exposure)

Video

9.5H (EIA), 14.5H (CCIR)

EXPOSURE

1.9µsec

150nsec Min.

VD (R-R)

TRIG

DISCHARGE

TRANSFER

9.5H (EIA), 14.5H (CCIR)

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Pulnix TM-76 Manual de instrucciones Pagina 24