Pulnix TM-250 Instrukcja Obsługi Pobierz pdf (Strona 27)

Page 21

Operation Mode

TM-250 Miniature CCD Camera

FIGURE 12. Trigger Position Reset/Restart Mode Timing

5.1.4 Trigger Width Reset/Restart Mode

The timing of the trigger pulse is not critical. It is, rather, the duration (width) that is important for

precise exposure time. The shutter pulse does not need to synchronize with Reset-Restart (EXT VD),

and can synchronize with moving objects.

A full picture ﬁeld can be obtained on every other ﬁeld, rather than on consecutive ﬁelds, as shown in

Figure 13, “Trigger Width Reset/Restart Shutter Mode Timing,” on page 22, because V shift has to be

stopped after the transfer pulse, and resume after the 11th line. Because V shift has been halted, part of

the ﬁeld cannot be shifted out. To get a full picture ﬁeld, the next shutter trigger must be prohibited,

which means a full picture is possible only on every other ﬁeld. If a full picture ﬁeld is required one

after another, the falling edge of the shutter pulse must fall between the 1st line and the 11th line to

ensure shift out of all the transferred charge from the previous transfer in FIELD accumulation mode.

This operation is similar to that of Trigger Position shutter, except that the timing is less critical.

TABLE 6. Trigger Position Reset/Restart Shutter Mode

OFF

ASY

CYC

TRIGGER

Polarity

Up Down Up Up Up Down Positive

F2: not applicable.

EXT VD (R.R.)

TRIG

DSUB pulse

Transfer

Exposure

Video Out

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 40 41

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