Pulnix TM-76 Manual de instrucciones descargar pdf (Pagina 26)

Page 20

Operation Mode

TM-75/76 High-Resolution CCD Camera

FIGURE 15. Position Shutter Even Field Timing

5.5 Pulse Width Control Reset-Restart Shutter

The shutter Trigger (TRIG) pulse is required to be wider than 1H (70µsec). The minimum exposure time

in this mode is 2.5H (1/6200 sec). In this mode, the position of TRIG does not have to be synchronized

with Reset-Restart VD (Ext. VD) and it can be asynchronous trigger with moving object. The exposure

is set by rising edge and falling edge of TRIG pulse, which can be any timing (asynchronous). The video

output is, however, synchronous with R-R VD. Since the vertical shift register must wait for completion

of TRIG and next VD, only one ﬁeld of image is valid after TRIG pulse. If continuous shutter control is

required with pulse width control, the TRIG falling edge must be within 9.5 H (14.5H for TM-76) from

each VD leading edge. To avoid any image ﬂickering between odd and even ﬁeld, the TRIG pulse is

required to synchronize with HD and Reset-Restart VD.

FIGURE 16. Pulse Width Shutter: Asynchronous Timing

VD (Internal)

EXT. TRIG

INTERNAL TRIG

DISCHARGE

TRANSFER

Min. Exposure (1/2H)

Exposure Time: = (9.5 H - 0H) - 8H = 0.5H (EIA)

= (14.5H-0H) - 13H = 0.5H (CCIR)

EVEN FIELD RELATION SHIP

Shortest exposure time example: 8H (EIA), 13H (CCIR)

9,5H (EIA), 14.5H (CCIR)

Missing VD

R-R VD

TRIG (pulse width)

DISCHARGE

TRANSFER GATE

EXPOSURE

V SHIFT REGISTER

VIDEO

no VD,

no clock

Stop clock

11H 11H

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Pulnix TM-76 Manual de instrucciones Pagina 26