| 摘要 |
An electrographic apparatus has a transparent photoconductor on which visible images are formed by applying toner to a latent electrostatic image. The toned image is subsequently transferred to a copy sheet and fused to the sheet. A post-development erase lamp is located on one side of the photoconductor. The density of toned images on the photoconductor is measured by light rays from the erase lamp traveling through the photoconductor and a toned control image thereon to a photodetector on the opposite side of the photoconductor. This eliminates the need for special lamps used only for measuring the density of toned control images.
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