US 6,144,407 AGranted

Image pickup apparatus which enables a light receiving period to commence within a relatively small amount of time after a shutter signal

AssigneeSony Corporation

InventorsYoichi Mizutani, Akihiro Kikuchi, Junichi Sakagami

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Abstract

An image pickup apparatus comprises a solid-state image pickup device including a plurality of light receiving areas, charge transfer areas, charge-reading gate areas and an output portion, a synchronous signal generator for producing line and frame synchronous signals, a timing signal generator for producing selectively a first internal frame synchronous signal in synchronism with the frame synchronous signal and a second internal frame synchronous signal asynchronous with the frame synchronous signal and for forwarding a charge-reading timing signal and a charge-transfer timing signal each synchronizing with the first or second internal frame synchronous signal, a driving signal generator for producing a gate driving signal and a charge-transfer driving signal in response to the charge-reading timing signal and the charge-transfer timing signal, respectively, and for supplying charge-reading gate areas and charge transfer areas with the gate driving signal and the charge-transfer driving signal, respectively, and a control unit operative, in response to a light-receiving command signal supplied thereto, to cause the timing signal generator to forward the charge-reading timing signal and the charge-transfer timing signal each synchronizing with the second internal frame synchronous signal during a predetermined period so that a light receiving period for the solid-state image pickup device is determined in response to the second internal frame synchronous signal.

Claims8

Dependent claims

An image pickup apparatus comprising;

a solid-state image pickup device having a light receiving and charge transfer portion which comprises a plurality of light receiving areas for storing charge produced by light reception, charge transfer areas for transferring charge, charge-reading gate areas for reading the charge stored in the light receiving areas to the charge transfer areas, and an output portion for converting the charge transferred through the charge transfer areas into an image pickup signal output,
synchronous signal generating means for producing line and frame synchronous signals,
timing signal generating means for producing selectively a first internal frame synchronous signal having the same phase as the frame synchronous signal or a fixed phase difference from the frame synchronous signal, an internal line synchronous signal having the same phase as the line synchronous signal or a fixed phase difference from the line synchronous signal, and a second internal frame synchronous signal asynchronous with the frame synchronous signal and for forwarding a charge-reading timing signal and a charge-transfer timing signal each synchronizing with one of the first and second internal frame synchronous signals and the internal line synchronous signal,
driving signal generating means for producing a gate driving signal and a charge-transfer driving signal in response to the charge-reading timing signal and the charge-transfer timing signal, respectively, and for supplying the charge-reading gate areas and the charge transfer areas with the gate driving signal and the charge-transfer driving signal, respectively, and
control means operative to form a light receiving period signal in response to an edge of the internal line synchronous signal which occurs first after an edge of a light-receiving command signal supplied thereto and, in response to the light receiving period signal, to cause the timing signal generating means to produce the second internal frame synchronous signal and forward the charge-reading timing signal and the charge-transfer timing signal such that a light receiving period for the light receiving and charge transfer portion of the solid-state image pickup device begins after the edge of the internal line synchronous signal which occurs within a time period corresponding to one line period after the edge of the light-receiving command signal.

2 more elements

An image pickup apparatus comprising:

a solid-state image pickup device having a light receiving and charge transfer portion which comprises a plurality of light receiving areas for storing charge produced by light reception, charge transfer areas for transferring charge, charge-reading gate areas for reading the charge stored in the light receiving areas to the charge transfer areas, and an output portion for converting the charge transferred through the charge transfer areas into an image pickup signal output;
synchronous signal generating means for producing frame synchronous signals;
timing signal generating means for producing selectively an internal frame synchronous signal having the same phase as the frame synchronous signal or a fixed phase difference from the frame synchronous signal, and for forwarding a charge-reading timing signal and a charge-transfer timing signal each synchronizing with said internal frame synchronous signals;
driving signal generating means for producing a gate driving signal and a charge-transfer driving signal in response to the charge-reading timing signal and the charge-transfer timing signal, respectively, and for supplying the charge-reading gate areas and the charge transfer areas with the gate driving signal and the charge-transfer driving signal, respectively;
and
control means operative to cause the timing signal generating means to forward the charge-reading timing signal repeatedly by a number of predetermined times so that the charge stored in the light receiving areas is read to the charge transfer areas intermittently by the number of predetermined times and accumulated in the charge transfer areas in the solid-state image pickup device in a predetermined unit period determined based on the internal frame synchronous signal, and then to cause the timing signal generating means to forward the charge-transfer timing signal so that the charge accumulated in the charge transfer areas is transferred through the charge transfer areas to the output portion as the signal charge in the solid-state image pickup device.

3 more elements

An image pickup apparatus with a solid-state image pickup device comprising:

a solid-state image pickup device having a light receiving and charge transfer portion which comprises a plurality of light receiving areas for storing charge produced by light reception, charge transfer areas for transferring charge, charge-reading gate areas for reading the charge stored in the light receiving areas to the charge transfer areas, and an output portion for converting the charge transferred through the charge transfer areas into an image pickup signal output;
synchronous signal generating means for producing line and frame synchronous signals;
timing signal generating means for producing selectively a first internal frame synchronous signal having the same phase as the frame synchronous signal or a fixed phase difference from the frame synchronous signal and a second internal frame synchronous signal asynchronous with the frame synchronous signal and for forwarding a charge-reading timing signal and a charge-transfer timing signal each synchronizing with one of the first and second internal frame synchronous signals;
driving signal generating means for producing a gate driving signal and a charge-transfer driving signal in response to the charge-reading timing signal and the charge-transfer timing signal, respectively, and for supplying the charge-reading gate areas and the charge transfer areas with the gate driving signal and the charge-transfer driving signal, respectively;
and
control means operative, in response to a light-receiving command signal supplied thereto, to cause the timing signal generating means to produce the second internal frame synchronous signal and forward the charge-reading timing signal and the charge-transfer timing signal each synchronizing with the second internal frame synchronous signal during a predetermined period so that a light receiving period for the light receiving and charge transfer portion of the solid-state image pickup device is determined in response to the second internal frame synchronous signal;
wherein said timing signal generating means is operative to forward a charge-sweeping timing signal synchronizing with one of the first and second internal frame synchronous signals in addition to the charge-reading timing signal and the charge-transfer timing signal, and said driving signal generating means is operative to supply the charge transfer areas with a charge-sweeping driving signal produced in response to the charge-sweeping timing signal so that charge in the charge transfer areas is swept away in the solid-state image pickup device and then to supply the charge transfer areas with the charge-transfer driving signal so that charge stored in the charge transfer areas is transferred to the output portion as signal charge in the solid-state image pickup device,
wherein said control means is operative to cause the timing signal generating means to forward the charge-reading timing signal repeatedly by the number of predetermined times so that the charge stored in the light receiving areas is read to the charge transfer areas intermittently by the number of predetermined times and accumulated in the charge transfer areas in the solid-state image pickup device in a predetermined unit period determined based on the second internal frame synchronous signal, and then to cause the timing signal generating means to forward the charge-transfer timing signal so that the charge accumulated in the charge transfer areas is transferred through the charge transfer areas to the output portion as the signal charge in the solid-state image pickup device, and
wherein said control means is operative to cause the timing signal generating means to forward a charge-drain timing signal so that the driving signal generating means supplies overflow control areas in the solid-state image pickup device with an overflow gate control signal produced in response to the charge-drain timing signal and thereby charge in the light receiving and charge transfer areas is drained through the overflow control areas to drain areas in the solid-state image pickup device before the timing signal generating means forwards the charge-transfer driving signal so that the charge accumulated in the charge transfer areas is transferred to the output portion as the signal charge in the solid-state image pickup device.

6 more elements

Dependencies are inferred from the claim text.