초록 ▼

An imager pixel including a photodetector, a first MOS transistor functioning as the driver of a source follower amplifier during signal readout, a second MOS transistor serving as a pixel readout transistor, a third MOS transistor serving as a photodetector reset transistor, and a reset noise cance

An imager pixel including a photodetector, a first MOS transistor functioning as the driver of a source follower amplifier during signal readout, a second MOS transistor serving as a pixel readout transistor, a third MOS transistor serving as a photodetector reset transistor, and a reset noise cancellation circuit including a fourth MOS transistor, first and second capacitances, and an amplifier having a gain which is the inverse of the ratio of the first to the second capacitance.

대표청구항 ▼

An imager pixel including a photodetector, a first MOS transistor functioning as the driver of a source follower amplifier during signal readout, a second MOS transistor serving as a pixel readout transistor, a third MOS transistor serving as a photodetector reset transistor, and a reset noise cance

An imager pixel including a photodetector, a first MOS transistor functioning as the driver of a source follower amplifier during signal readout, a second MOS transistor serving as a pixel readout transistor, a third MOS transistor serving as a photodetector reset transistor, and a reset noise cancellation circuit including a fourth MOS transistor, first and second capacitances, and an amplifier having a gain which is the inverse of the ratio of the first to the second capacitance. efore developing of said electrostatic latent image. 7. An image forming apparatus as claimed in claim 5, being characterized by further comprising a charge control device for making said latent image carrier into a uniformly charged state, wherein residual developing powder left on said latent image carrier after transfer is adapted to be charged to have the same polarity as the original polarity of said developing powder consisting of a single component at the same time when said charge control device makes said latent image carrier into the uniformly charged state. 8. An image forming apparatus as claimed in claim 5, being characterized in that said developing is reverse developing. 9. An image forming apparatus as claimed in claim 6, being characterized by further comprising a charge control device for making said latent image carrier into a uniformly charged state, wherein residual developing powder left on said latent image carrier after transfer is adapted to be charged to have the same polarity as the original polarity of said developing powder consisting of a single component at the same time when said charge control device makes said latent image carrier into the uniformly charged state. 10. An image forming apparatus as claimed in claim 6, being characterized in that said developing is reverse developing. 11. An image forming apparatus as claimed in claim 7, being characterized in that said developing is reverse developing. 12. An image forming apparatus as claimed in claim 9, being characterized in that said developing is reverse developing. 13. An image forming apparatus as claimed in claim 2, being characterized in that said developing device is a developing device for developing said electrostatic latent image with developing powder consisting of a single component; by further comprising a transferring device for transferring a developing powder image on said latent image carrier, developed by said developing device, to a receiving medium; and in that residual developing powder left on said latent image carrier after transfer is adapted to be charged to have the same polarity as the original polarity of said developing powder consisting of a single component. 14. An image forming apparatus as claimed in claim 13, being characterized in that a large number of microscopic particles are interposed at least between said writing electrodes and said latent image carrier to allow free rolling of said microscopic particles, wherein said microscopic particles are adapted to be charged at least to have the same polarity as the original polarity of said developing powder before developing of said electrostatic latent image. 15. An image forming apparatus as claimed in claim 13, being characterized by further comprising a charge control device for making said latent image carrier into a uniformly charged state, wherein residual developing powder left on said latent image carrier after transfer is adapted to be charged to have the same polarity as the original polarity of said developing powder consisting of a single component at the same time when said charge control device makes said latent image carrier into the uniformly charged state. 16. An image forming apparatus as claimed in claim 13, being characterized in that said developing is reverse developing. 17. An image forming apparatus as claimed in claim 14, being characterized by further comprising a charge control device for making said latent image carrier into a uniformly charged state, wherein residual developing powder left on said latent image carrier after transfer is adapted to be charged to have the same polarity as the original polarity of said developing powder consisting of a single component at the same time when said charge control device makes said latent image carrier into the uniformly charged state. 18. An image forming apparatus as claimed in claim 14, being characterized in that said developing is reverse developing. 19. An image forming appara