Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 7848631 | Imaging apparatus and method for controlling the same An imaging apparatus includes an image sensor configured to capture an image of an object, a mechanical shutter including a second curtain and a second-curtain holding mechanism configured to electromagnetically hold the second curtain at an initial position prior t... | 12/07/2010 |
| 7133072 | Image processing apparatus having an image correction circuit and its processing method An image processing apparatus for processing an image sensed by an image sensing element such as a CCD sensor includes a dark correction circuit for making dark correction of the image, a defect correction circuit for correcting a defective pixel in the image using ... | 11/07/2006 |
| 7052143 | Projection device having blower and/or lamp with feedback control In one example, a method for controlling temperature in a projection device, comprises measuring a plurality of temperatures in the projection device; averaging said plurality of temperatures to determine an averaged temperature; determining an error between a set-p... | 05/30/2006 |
| 6822688 | Movable-lens position control apparatus An optical apparatus having an image-forming optical system comprising a movable lens, comprises a lens drive mechanism for moving the movable lens, a focus adjusting device for automatically adjusting an imaging position by moving the movable lens or another optica... | 11/23/2004 |
| 6515275 | Method and apparatus for determining the illumination type in a scene A method and apparatus for determining the illuminant type in a digital image. A photo sensor that has an array of photo-cells that detect non-visible light, embedded in the array of photo-cells that detect only visible light is disclosed. Using the visib... | 02/04/2003 |
| 6496651 | Method and apparatus for controlling exposure of camera An exposure control method and apparatus for a camera having a two-area divided brightness measurement system. A central light value is determined based on a central area brightness of a photographic scene, and a peripheral light value is determined based... | 12/17/2002 |
| 6389235 | Camera having the capability to detect and display insufficient shutter speed A camera includes a shutter unit for limiting the exposure time to a record medium, a shutter time setting unit for setting the shutter time of the shutter unit, a shutter drive and control unit for driving and controlling the shutter unit, a shutter cond... | 05/14/2002 |
| 5809315 | Electronic apparatus The present invention relates to an electronic apparatus which is arranged to drive a load by means of a microcomputer to which the boosted voltage obtained by boosting a battery output by boosting means is applied. The present invention also relates to a... | 09/15/1998 |
| 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 |
| 5636143 | Method and apparatus for estimating color temperature, photographing apparatus, and method and apparatus for determining exposure There are provided a method and apparatus capable of estimating a color temperature of a photographic light source. A theoretical reference value is obtained which is represented by summation or integration of the product of a spectral energy distribution... | 06/03/1997 |
| 5541706 | Exposure calculation device for a camera In an exposure calculation device for a camera including a photometric sensor which performs photometry on the light from an object to be photographed and outputs a photometric signal related to the brightness thereof and a calculation device which calcul... | 07/30/1996 |
| 5162836 | Temperature measuring apparatus for camera A temperature measuring apparatus for a camera includes an actuator for performing an operation of the camera. A time measuring unit starts time measurement when the actuator finishes its operation and is set in an inoperative state, and outputs timeover ... | 11/10/1992 |
| 4668069 | Exposure control device in a camera An exposure control device in a camera comprises power supply circuit means for producing a temperature signal representative of an amount proportional to the absolute temperature, means for producing a first digital data representative of the film speed,... | 05/26/1987 |
| 4512643 | Exposure control device for camera An exposure control device for a camera wherein a current produced from a light sensitive element in proportion to the quantity of light incident on the element is logarithmically suppressed. A suppressed voltage obtained from this current to which voltag... | 04/23/1985 |
| 4511234 | Gain switching amplifier A circuit for use in a temperature compensated large signal current amplifier. As utilized in one embodiment, a camera exposure control compensates film reciprocity errors with a buffer amplifier. Another embodiment of the buffer amplifier includes log co... | 04/16/1985 |
| 4479708 | Temperature compensation system of light measuring circuit Disclosed is a temperature compensation system for light measuring circuits. Said system compensates for the change, over temperature, of the output of the light measuring circuit by applying a bias source with a predetermined temperature coefficient. The... | 10/30/1984 |
| 4462672 | Control circuit for an electromagnetically driven programming shutter The electromagnetically driven programming shutter includes magnets and shutter blade driving coils provided on the respective shutter blades of the shutter and electromagnetically cooperating with the magnets and the shutter blades are actuated for openi... | 07/31/1984 |
| 4340284 | Temperature-compensated signal transmitting device In a camera having means for arbitrarily selecting the exposure condition of a film thereby to generate a signal based on said selection, said signal representing exposure information and having a temperature coefficient, and exposure time determining mea... | 07/20/1982 |
| 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 |
| 4284334 | Circuit arrangement for the compensation of the temperature coefficient of semiconductor junctions An arrangement for compensating the temperature coefficient of the semiconductor junction connected in a circuit, comprising first, second, and third transistors of the same predetermined type, each having a base-emitter junction and operatively connected... | 08/18/1981 |
| 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 |
| 4210394 | Shutter time temperature compensating device in a camera An electrical circuit for compensating for variations in the shutter time of the shutter mechanism in a camera which are caused by temperature variations comprises a temperature detecting circuit which generates an output voltage corresponding to the ambi... | 07/01/1980 |
| 4180310 | Photometric circuit A novel photometric circuit for a camera is disclosed wherein the operational amplifiers common to conventional photometric circuits are eliminated from that part of the circuit which solves the exposure Apex indication equation: Sv +Bv | 12/25/1979 |
| 4149786 | Camera exposure time control circuitry Control circuitry controls exposure time in accordance with a light representative signal that has been stored in a storing device through a storing switch from a light measuring circuit which includes a photocell receiving scene light through the camera ... | 04/17/1979 |
| 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 |
| 4112446 | Exposure control circuit for cameras with shutter release locking means An exposure control circuit for a camera is provided with a temperature compensating circuit. The temperature compensating circuit has a compensable range. When the ambient temperature of the camera is beyond the compensable range, the shutter release mec... | 09/05/1978 |
| 4106035 | Photometric circuit A novel photometric circuit for a camera is disclosed wherein the operational amplifiers common to conventional photometric circuits are eliminated from that part of the circuit which solves the exposure Apex indication equation: Sv + Bv | 08/08/1978 |
| 4072962 | Metering device A metering device comprises a photoelectric converter circuit for generating a first voltage corresponding to the brightness of a subject to be photographed. The converter circuit includes a photoelectric converter element and a first conductor element fo... | 02/07/1978 |
| 4051490 | Photographic exposure meter circuit having temperature compensation An exposure meter circuit includes a photo diode 2 and associated components 1, 3-6 for producing a first logarithmically compressed voltage V1 proportional to the apex value Bv of the sensed brightness level. The temperature charact... | 09/27/1977 |
| 4037234 | Exposure control system stabilized against temperature variation An exposure control system for a camera capable of deriving more reliable and accurate exposure values over an extended range of scene luminance despite variation of the ambient temperature of the system than was previously possible. The exposure control ... | 07/19/1977 |
| 4000498 | Temperature compensated exposure control apparatus for a camera An exposure control apparatus which can set accurate shutter speed constantly irrespective of changes in ambient temperature and which can eliminate not only an error in shutter speed caused by an expansion semiconductor element but also an error in shutt... | 12/28/1976 |
| 3992714 | Photographic film exposure determining system compensated for temperature and voltage fluctuations An electrical system wherein exposure time and diaphragm aperture form a pair of exposure-determining factors one of which is automatically determined by the system in connection with exposure of film in a camera. The electrical system forms an exposure m... | 11/16/1976 |
| 3988749 | Device for automatic diaphragm setting in photographic cameras An automatic diaphragm control for camera lenses having independent diaphragm and shutter speed rings in which a reversible motor is positioned to drive the diaphragm ring, and a gear engaging the diaphragm ring drives a potentiometer. A light-sensor is i... | 10/26/1976 |
| 3973267 | Exposure control apparatus for a camera The present invention relates to an exposure control apparatus for a camera which is so designed that the output terminal of the light measuring circuit of the brightness of the object to be photographed having a photo electric transducing means is connec... | 08/03/1976 |
