Did You Know...
...that several people are credited with the invention of the flush toilet? Most people have heard of Thomas Crapper (1837-1910), the sanitary engineer who invented the valve-and-siphon arrangement that made the modern toilet possible. Another claimant to "the throne" was British inventor Alexander Cumming who patented a toilet in 1775. Then there's a nameless Minoan (a native of ancient Crete) who lived 4,000 years ago who supposedly was ahead of his time and created the first flush toilet!
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| Number | Title | Issue Date |
| 7684691 | Image capture apparatus and control method thereof An image capture apparatus includes a photometry unit, which performs photometry of luminance in each of the photometry areas in an image sensing scene, a photometry mode determination unit, which determines a photometry mode, a filter operation unit, which performs... | 03/23/2010 |
| 7268806 | Exposure control device for camera mounted on electronic apparatus An exposure control device accurately adjusts exposure even when photographing the operator. An area-integration circuit divides a photographed image into a central area and a peripheral area to integrate corresponding video signals for the respective areas. When th... | 09/11/2007 |
| 7206093 | Scanning device and method for saving compensation memory A method of reducing memory requirement in the compensation memory unit of a scanner. The method includes providing an even compensation data value and an odd compensation data value and averaging the two to produce an odd-even compensation data value. Only half as ... | 04/17/2007 |
| 6945260 | Machine for treating objects A machine for treating objects having a series of stations (12) whereof each includes a system for gripping (16) a container (11) in a loading point of the path, wherein, between the loading and unloading points, the container (11) is dis... | 09/20/2005 |
| 6941240 | Position measuring device A position measuring system that includes a scale graduation, a scanning unit for scanning the scale graduation. An adjustment device that includes a displacement element for setting a position of the scanning unit with respect to the scale graduation and a gear-dow... | 09/06/2005 |
| 6324344 | Light measuring device and camera A light measuring device includes an integration-type light measuring sensor having a plurality of pixels and arranged to logarithmically compress a signal of light received by each pixel and to output the signal as a light measurement value for each pixe... | 11/27/2001 |
| 5708880 | CMOS-analog IC for controlling camera and camera system using the same In a camera controller using a CMOS-analog-IC, a microcomputer, logarithmic compression type distance measuring and photometric circuits, each constituted by a CMOS device having a parasitic bipolar transistor having a p- or n-type well as a base and an n... | 01/13/1998 |
| 5602615 | Photometric device to determine a correct photometric value of a spot photometric region A photometric device, used in an optical apparatus such as a camera, which includes photometric elements to measure photometric values according to plural regions of a subject field, and corrects the photometric values of photometric elements correspondin... | 02/11/1997 |
| 5557363 | CMOS-analog IC for controlling camera and camera system using the same In a camera controller using a CMOS-analog IC, a microcomputer, logarithmic compression type distance measuring and photometric circuits, each constituted by a CMOS device having a parasitic bipolar transistor having a p- or n-type well as a base and an n... | 09/17/1996 |
| 5548398 | Illuminant discriminator providing detection of high efficiency illumination An illuminant discriminator distinguishes a range of separate illuminants, including high efficiency fluorescent lighting, by modifying the frequency response of a signal output from a photodetector. A switchable high pass filter coupled to the photodetec... | 08/20/1996 |
| 5291238 | Photometering circuit A photometering circuit comprises a photo-diode, an operational amplifier, a feedback diode and a latch releasing transistor. In a circuit utilizing a PNP transistor, for example, a cathode of the photo-diode is connected to a non-inverting input terminal... | 03/01/1994 |
| 4802107 | Offset drift correction method in color film inspection apparatus An offset drift correction method for use in in a color film inspection apparatus includes the steps of; measuring the changes of various amounts of light at intervals of a predetermined amount of light as density signals by using a green standardized log... | 01/31/1989 |
| 4711546 | Photometric circuit A photometric circuit which has an operational amplifier and produces a result of light measurement with a logarithmic compression element arranged between the input and output terminals of the operational amplifier to logarithmically compress a signal ob... | 12/08/1987 |
| 4647175 | Circuit arrangement for an electronic exposure meter In a switching circuit for an electronic exposure meter in optical devices with a photoelectric converter at the input of an amplifier which logarithmizes the output current from said converter, with a temperature compensation circuit and a photoelectric ... | 03/03/1987 |
| 4498753 | Photometric apparatus for cameras A photometric apparatus for a camera comprises a reference voltage circuit; an operational amplifier including a photoelectromotive element for photometry, an output terminal of said reference voltage circuit and an input terminal of said amplifier being ... | 02/12/1985 |
| 4492858 | Photometric circuit having a plurality of photoelectric transducer elements capable of being selectively enabled for photometry A photometric circuit comprises an operational amplifier including a plurality of differential amplifiers, a constant current bias circuit for supplying a constant current bias to the differential amplifiers, and a bias control switching circuit which sel... | 01/08/1985 |
| 4477161 | Compensator system for diaphragm control in a single-lens reflex camera of interchangeable lens type A compensator system for diaphragm control in a single-lens reflex camera of interchangeable type having an exposure control circuit responsive to the position of a lever that is operatively coupled to the diaphragm according to a preset position of a dia... | 10/16/1984 |
| 4473744 | Photometric apparatus for camera A photometric apparatus for a camera includes a diode for logarithmic compression and a semiconductor analog switch in series connection between an output terminal of a first operational amplifier and a second operational amplifier forming an integration ... | 09/25/1984 |
| 4462670 | Light measuring apparatus for camera A light measuring apparatus for camera is disclosed. It is known that some type of light measuring apparatus for camera involves the problem of so-called "latch" which is caused by opposite charge accumulated at the high impedance location in the light me... | 07/31/1984 |
| 4391488 | Mount device of an interchangeable lens In an interchangeable lens having a mount mountable on a camera incuding an electric circuit associated with exposure control and a displaceable actuating member for correcting the electric circuit so as to be accommodated to the focal length of the inter... | 07/05/1983 |
| 4390258 | Photomeric circuit for camera A photometric circuit includes a differentiator arranged in cascade connection with an integrating circuit including an integrating capacitor which directly integrates a photocurrent produced by a photoelectric transducer element which is used for photome... | 06/28/1983 |
| 4367932 | Exposure control system An exposure control system includes a device for measuring an intensity of the ambient light, three controllers for controlling three factors of exposure time, aperture size and amount of flash light to be emitted, and a device for setting three pieces of... | 01/11/1983 |
| 4367022 | Exposure control circuit for camera of TTL reflective photometry type An exposure control circuit for camera of TTL reflective photometry type includes a shutter blind of a lower reflectivity than that of a film. The circuit is arranged such that until a given proportion of the film surface becomes exposed as a result of ru... | 01/04/1983 |
| 4353631 | Exposure information input circuit for electric shutter In an electric shutter having a photoelectric element, a time constant circuit for use in controlling exposure and a low brightness sensor circuit for use in connecting said photoelectric element in series with a comparator resistance and in sensing a low... | 10/12/1982 |
| 4325615 | Exposure control system for single lens reflex cameras A through-the-lens type automatic exposure control system controls exposure time in accordance with an object light representative signal stored in a storage device prior to a shutter actuation, with respect to exposure time faster than a given value, and... | 04/20/1982 |
| 4306807 | Light measuring system In the disclosed system, a light measuring circuit having a logarithmical amplifier, is constructed to produce pulses at a frequency corresponding to the output of the light measuring circuit. Pulses are counted during a time interval corresponding to the... | 12/22/1981 |
| 4302780 | Photometric system A photometric system for use in an image pick-up device is disclosed. The photometric system comprises the steps of forming an image focussed by a camera lens system on a light receiver consisting of a plurality of charge transfer elements arranged in a p... | 11/24/1981 |
| 4269490 | Programmed shutter gamma switching circuit A gamma switching circuit of a programmed shutter having a voltage conversion circuit which subjects to logarithmic compression an optical current which varies with γ=1 with respect to brightness variation. A constant circuit has only an inflow current a... | 05/26/1981 |
| 4258993 | Light discrimination apparatus A control apparatus is disclosed for discriminating between light emitted from sources having respectively different flicker ratios (the ratio of the brightest and the dimmest intensities during a given time period). A photocell produces a voltage having ... | 03/31/1981 |
| 4247186 | Photometric circuit for camera A photometric circuit for a camera including a first operational amplifier with a photo-electric element connected between its inverted and non-inverted input terminals and, a logarithmic compression diode connected between the output terminal and the inv... | 01/27/1981 |
| 4188551 | Amplifier circuit having photoelectric converter A photometric amplifier circuit, having a photocurrent converting element connected between a pair of inverting and noninverting input terminals of a differential amplifier, for amplifying an electric signal responsive to the quantity of light, is charact... | 02/12/1980 |
| 4181413 | Electronic shutter control circuit An electronic shutter control circuit in a camera has an operational amplifier, a light receiving element connected between the input terminals of the operational amplifier and a logarithmic compression diode, one terminal of which is connected to the cat... | 01/01/1980 |
| 4176955 | Exposure meter An exposure meter provides a display indicating the brightness of selected portions of a scene to be photographed. In one embodiment, a photometering block including a plurality of light sensitive elements is employed, and there is an automatic fixed disp... | 12/04/1979 |
| 4174160 | Programmed automatic exposure control circuitry In a photographic camera capable of programmed automatic exposure control, circuitry is provided for also enabling exposure time-preferred automatic diaphragm control and diaphragm-preferred automatic exposure time control. The diaphragm is settable to an... | 11/13/1979 |
| 4170411 | Control circuit for a memory type electric shutter In the system disclosed, a feedback circuit connects the output of the last of a plurality of cascaded amplifier stages to the input of the first stage. A photoelectric transducer is connected to one of the stages. The feedback connection compresses the o... | 10/09/1979 |
| 4166679 | Exposure information setting circuit The present invention is an exposure information setting circuit for use in photographic cameras which calculates the required exposure time in response to input signals indicative of APEX indices and produces a signal indicative of the exposure time. The... | 09/04/1979 |
| 4166696 | Photometer A photometer for providing a measurement of shutter speed or aperture setting corresponding to a preselected value of the other comprises a photodiode supplying a voltage proportional to the logarithm of the measured light intensity. This voltage controls... | 09/04/1979 |
| 4132985 | Automatic control device for cameras This invention relates to an automatic camera exposure control device comprising a first light measuring circuit including a photoelectric element receiving light through the objective lens of the camera and generating a first output proportional to the l... | 01/02/1979 |
| 4129366 | Photometric device for a camera A photometric device for a camera, wherein there are provided a photometric circuit having a photo-electric conversion element of quick photo-responsive characteristic so as to convert light from an object to be photographed into a photo-electric output s... | 12/12/1978 |
| 4124855 | Automatic exposure control apparatus and a camera having the same An automatic exposure control apparatus of electric type for a photographic camera having an exposure control parameter setting means cooperative with a geometrical progression scale in isometric graduation is provided with a resistor device. The device i... | 11/07/1978 |
