Did You Know...
...that it was melting ice cream that inspired the invention of the outboard motor? It was a lovely August day and Ole Evinrude was rowing his boat to his favorite island picnic spot. As he rowed, he watched his ice cream melt and wished he had a faster way to get to the island. At that moment the idea for the outboard motor was born!
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 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 |
| 5006880 | Programmable shutter A programmable shutter of the type wherein a shutter blade is opened and closed by means of a stepping motor. The motor is rotated in a forward direction by drive pulses of a predetermined fixed period to gradually open a sector while at the same time a l... | 04/09/1991 |
| 4808811 | Light integrating circuit for use in a light measuring device which is accurate for both low and high light values A light measuring circuit including a light sensing device for sensing light and producing a signal representative of the light sensed, a compressing circuit for compressing the signal, a capacitor having one terminal connected to a predetermined voltage,... | 02/28/1989 |
| 4710014 | Control circuit for a programming shutter A control circuit for a programming shutter includes a light receiving element which is always exposed to light from a subject to be photographed and a logarithmic compression device which logarithmically compresses a photocurrent flowing through the ligh... | 12/01/1987 |
| 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 |
| 4500192 | Automatic exposure controller for a camera An automatic exposure controller for a camera comprises an analog-to-digital converter which converts a logarithmically compressed voltage corresponding to the brightness of an object being photographed into a digital value. A central processing unit rece... | 02/19/1985 |
| 4482238 | Brightness warning device for camera A brightness warning device for a camera is disclosed, which has a warning means and a detecting circuit for detecting a charge level of the timing capacitor in the exposure amount adjusting circuit of the aforesaid camera upon attainment of the detecting... | 11/13/1984 |
| 4479707 | Exposure time reproducing device In the disclosed exposure time reproducing device, a digitally suppressed exposure time datum is expanded by shifting the decimal part of the datum according to the contents of its integral part. The expanded datum thus obtained is read out by means of pu... | 10/30/1984 |
| 4435057 | Exposure control device for cameras A camera capable of AE-lock photography wherein an output of a light measuring circuit is stored in response to a manual operation at an arbitrary time prior to a shutter release operation, and exposure is controlled in accordance with the stored output. ... | 03/06/1984 |
| 4408852 | Automatic exposure controller for camera of TTL direct photometry type Automatic exposure controller for camera of TTL direct photometry type forms a difference between a photometric value which is obtained by determining a fixed reflection from only a first blind surface at the initiation of running of a first shutter blind... | 10/11/1983 |
| 4375321 | Exposure amount control device An exposure control device for use with a set of shutter blades which form a principal opening through which an exposure is made, includes a member which forms an auxiliary opening of a predetermined aperture before the shutter release starts. Upon releas... | 03/01/1983 |
| 4324462 | Exposure time control circuit for camera A circuit for controlling an exposure time of a camera which operates depending on whether or not an electronic flash used with the camera is charged and ready for operation. An arithmetic operation circuit operates upon signals representing object bright... | 04/13/1982 |
| 4313656 | Weighting of the scene light signal during the shutter opening operation A system is disclosed for automatically controlling the shutter in a camera in accordance with ambient scene light level. While the shutter is opening, incident light is weighted at only one-half the value at which it is weighted after the shutter has bee... | 02/02/1982 |
| 4303318 | Camera exposure time control device An exposure time control device for a camera which measures the light reflected from a surface of a leading shutter curtain and/or a surface of a film can determine exact exposure time even if difference exists between reflection factors of the surfaces, ... | 12/01/1981 |
| 4264159 | Control system for single lens reflex camera An automatic exposure control system for a single lens reflex camera, of the type wherein diaphragm blades defining a diaphragm aperture are driven in response to a camera release operation to change the aperture in accordance with the light from an objec... | 04/28/1981 |
| 4255027 | Exposure control device for photographic camera In a photographic camera provided with an electric shutter speed control circuit including a light measuring circuit in which scene brightness information is log-compressed and memorized by a memory circuit, the information is log-expanded by use of a dec... | 03/10/1981 |
| 4229088 | Exposure time controlling system An exposure time controlling system includes a circuit for producing an APEX shutter speed signal which is applied to a first discriminator for briefly classifying the APEX shutter speed signal into four classes and also to a second discriminator for sub-... | 10/21/1980 |
| 4213683 | Electronic shutter driving device for camera An electronic shutter driving device has a logarithmic expansion circuit which includes no semiconductor element such as a transistor and a field-effect transistor and comprises an operational amplifier, a series of resistors connected to an inverting inp... | 07/22/1980 |
| 4192586 | Electronic system for photographic devices There is disclosed herein an electronic system and circuits for photographic devices for performing certain photographic calculation and control functions. In an exemplary embodiment, the system is particularly useful for performing metering, calculation ... | 03/11/1980 |
| 4158492 | Light responsive circuit A light responsive circuit adapted to measure natural or ambient light and artificial light such as from an electronic flash device, includes a photocell, a logarithmic compression circuit for generating a first output proportional to the logarithm of the... | 06/19/1979 |
| 4141633 | Exposure control device An automatic exposure control circuit for a camera is disclosed. The circuit is capable of automatically controlling the shutter speed when the diaphragm is manually set, and is capable of automatically controlling the diaphragm opening when the shutter s... | 02/27/1979 |
| 4095241 | Photo-sensing circuit The photo-sensing circuit of the present invention has output characteristics which are linear for a wider range than that of a conventional photo-sensing circuit. In this invention the amount of incident light of the photographing field which is to be se... | 06/13/1978 |
| 4072961 | Light measuring circuit for automatic exposure control Light measuring circuit for camera automatic exposure control measures scene light passing through the objective and reflected at the film surface and/or the shutter curtain surface located at the exposre aperture of the camera. The measuring circuit is p... | 02/07/1978 |
| 4040068 | Exposure time control device for an electric shutter in a single reflex camera with through the lens measuring system A control device for controlling the exposure time automatically for an electric shutter, in a single reflex camera of the so-called "through the lens" photometric type which determines the brightness of an object by means of the light past through the pr... | 08/02/1977 |
| 4021822 | Electrically controlled shutter An improvement is made in a camera wherein the exposure is controlled by an electronic circuit comprising a photoelectric element so situated as to receive a light reflected from the surface of photographic film in the camera. Conventional shortcomings of... | 05/03/1977 |
| 3972055 | Multi-exposure control device for cameras The multi-exposure control device is provided with an automatic mechanism for stopping-down the diaphragm from an open position prior to exposure. A diaphragm adjusting ring stops the stopping-down operation at the pre-selected diaphragm aperture. An auto... | 07/27/1976 |
| 3968502 | Electric shutter circuit An electric shutter circuit is disclosed, which linearly varies the resistance in a bias electric power source for setting exposure factors for an automatic exposure control to thereby adjust the collector current of an electric current controlling transi... | 07/06/1976 |
| 3961338 | Automatic exposure time control device for use in single lens reflex camera In a device including a light measuring circuit having a photocell for receiving light from the object to be photographed to give an output and operable to convert the output to a voltage proportional to the logarithm of the intensity of the light, a memo... | 06/01/1976 |
| 3956757 | Camera exposure control circuit An automatic exposure control circuit for a camera including a light receiving element positioned internally of the camera for receiving light passing through the camera objective. The light receiving element converts the incident light into a correspondi... | 05/11/1976 |
| 3952318 | Shutter control circuit for cameras An electrical system to be used in a camera for controlling exposure time. The electrical system includes a pair of substantially identical constant voltage sources respectively having inputs connected together. A buffer circuit is coupled between an inte... | 04/20/1976 |
| 3949412 | Camera with an exposure indicating and control device A camera is provided, in which the light sensitive element for the electronic exposure meter can be commonly used as the light sensitive element for the exposure control circuit.... | 04/06/1976 |
| 3936842 | Automatic exposure time control circuitry for a camera using a photodiode as a light measuring element A light measuring circuit for an exposure time control device uses a photodiode to measure the object brightness and a logarithmic compressing diode to provide negative feedback between the output terminal and one input terminal of a differential amplifyi... | 02/03/1976 |
| 3931628 | Exposure time control device for an electric shutter in a single reflex camera with through the lens measuring system A control device for controlling the exposure time automatically for an electric shutter, in a single reflex camera of the so-called "through the lens" photometric type which determines the brightness of an object by means of the light past through the pr... | 01/06/1976 |
