The linearity and dynamic range of a photodetector system is enhanced by providing real time cancellation of condition-dependent quiescent output signals from the photosensitive devices by provision of a condition-dependent output signal monitoring device which drives the input section of a current mirror having output sections connected to the active photosensitive devices to zero out the condition-dependent quiescent output signals of those photosensitive devices during system operation. Multiple output sections may be run from a single input section of the current mirror.

Quiescent signal compensated photodetector system for large dynamic range and high linearity

An electromagnetic radiation intensity comparator is disclosed for providing an indication of differences between electromagnetic radiation intensities occurring at different photodetectors.

Electromagnetic radiation intensity comparator apparatus

The disclosed light measuring arrangement is positioned to receive and measure light from a focusing screen on which a display of focusing conditions is superimposed. A correcting circuit corrects the object brightness sensed by the light measuring arrangement. When display segments of the display are selectively switched on and off, the correcting circuit produces an output signal representing a corresponding brightness correction factor which is applied to the light measuring arrangement.

Light measuring device

The present invention involves identifying media type in a media processing device. A system according to one embodiment of the invention includes a thermal energy source and a thermal energy sensor. The thermal energy source and thermal energy sensor are arranged along a media feed path so as to accommodate transfer of thermal energy to the media by the thermal energy source, diffusion of such thermal energy, and subsequent sensing of such diffused thermal energy to determine a heat capacity of the media, such heat capacity being indicative of media type.

Media identification system

Printing controlling device and method, and program executed on computer

An object-to-be-printed detector for judging whether an object-to-be-printed is made of plane paper or of special paper. The detector comprises an infrared sensor for detecting infrared radiation (4) radiated from an object (1) heated by heating means (2) to judge whether the object is made of plane paper or special paper.

Object-to-be-printed detector and print detecting method

An exposure control system for use with single lens reflex cameras in which a photo-diode is connected across first and second inputs of a differential amplifier, and first and second variable resistors are connected at one end to the first and second differential amplifier inputs, respectively, and at the other ends in common with a power source, the resistors being variable as a function of film speed adjustment and lens aperture adjustment, respectively, the output of the differential amplifier being negatively fed back to one of its inputs such that the amplification factor of the photo-current generated by the photo-diode is the ratio of the first and second resistors.

Exposure control system for cameras

An automatic exposure control circuit for a camera or the like includes a memory circuit comprising a series connection of a capacitor and an impedance element connected to an input of a high input impedance circuit to enable the measurement of the amount of mean light during photography under a fluorescent lamp.

Automatic exposure control circuit for a camera

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Object-to-be-printed detector and print detecting method

Exposure control system for cameras

Automatic exposure control circuit for a camera