Specifications

Appendix G Interline CCD Cameras 89

Empty Readout Register

Transfer Image to

Storage Registers

Readout Register with charge

from first cell in each storage

One cell shifted down

to Readout Register.

Second exposure begins.

Second cell shifted

down to Readout

posure continues.

All charges transferred.

Storage registers empty.

Second exposure continues.

Empty Output Register. All

charges have been shifted to

output.

Readout Register with charge from

second cell of each storage register.

Storage Cell

Imaging Cell

Output Register Cell

Charge Absent

First Exposure Charge

Second Exposure Charge

Figure 45. Overlapped mode Exposure and Readout

Non-Overlapped Operation Exposure and Readout

Figure 46 illustrates exposure and readout when operating in the non-overlapped mode.

Non-overlapped operation occurs automatically any time the exposure time is shorter

than the readout time. Figure 46 contains four parts, each depicting a later stage in the

exposure-readout cycle.

Part 1 of the figure shows the array early in the exposure. The imaging cells contain

charge proportional to the amount of light integrated on each of them. The storage cells

are empty because no charge has been transferred to them. The arrows between adjacent

imaging and storage cells indicate the direction the charge will be shifted when the

transfer occurs.

Part 2 of Figure 46 shows the situation early in the readout cycle. The charge in the imaging

cells has been transferred to the adjacent storage cells and down-shifting to the readout