摘要:
A distance measuring device for ensuring accuracy of the positional relationship between the optical axis of a light-receiving lens and the optical center of a light-receiving element obtains distance information data by measuring the distance to a target plate which is 1 meter from the distance measuring device. If the distance information is not smaller than 1.625 meter, a switch is connected to one pair of terminals and the difference between reference output data stored in a control circuit and output data of an AF-IC obtained when the distance to the target plate is measured with the switch connected to the pair of terminals is calculated and stored in a memory circuit. When the value of the distance information data is not greater than 0.375 meter, the switch is connected to another pair of terminals, and output deviation data is stored in the memory circuit 11 in the same way. When the value of the distance information value is smaller than 1.625 meter and greater than 0.375 meter, the switch is connected to a further pair of terminals, and output deviation data is stored in the memory circuit in the same way.
摘要:
A photographic camera has a rectilinear approximate operation circuit for calculating characteristic correction data for correcting errors in the operational characteristics of the camera. Predetermined theoretical characteristic data dependent on operational characteristics of the camera are stored. Measured data corresponding to predetermined measured values are stored as individually measured characteristic data in a nonvolatile EEPROM so that the stored measured data can be easily changed by rewriting the EEPROM. An object signal is generated depending on an object to be photographed. The rectilinear approximate operational circuit calculates characteristic correction data from the object signal, the theoretical characteristic data and the measured characteristic data, which is then used for correcting errors in the operation characteristics of the camera.
摘要:
A distance measuring apparatus for a camera comprises a light projecting device for projecting light to an object to be photographed, a light receiving circuit for receiving light projected by the light projecting device and reflected by the object to be photographed and for converting the reflected light into first and second output signals, a first selecting device for selecting the first output signal, and a second selecting device for selecting one of the first and second output signals. A first signal processing circuit is connected to the first selecting device for processing the output signal selected by the first selecting device. A second signal processing circuit is connected to the second selecting device for processing the output signal selected by the second selecting device. A first memory stores output signals of the first and second signal processing circuits, the output signals being generated upon operation of the light projecting device when the first selecting device selects the first output signal and the second selecting device selects the second output signal. A second memory stores output signals of the first and second signal processing circuits, the output signals being generated upon operation of the light projecting device when the first and the second selecting devices both select the first output signal. A calculation circuit calculates a distance to the object to be photographed by adjusting an output of the first memory by an output of the second memory.
摘要:
In a step-up circuit for causing the emission of light of a distance measuring light emitting element, the step-up circuit outputs a step-up voltage from one terminal of a step-up capacitor. A step-up voltage level changeover circuit applies a step-up voltage to the capacitor every time the distance measuring light emitting element emits light that is higher than the step-up voltage in the normal state. The number of parts is reduced by eliminating a separate capacitor for light emission, the space for the circuit is reduced by using the capacitor having a small capacity, the soldering steps for fabrication of the circuit are automated; and the costs for assembly are ameliorated owing to the automation.
摘要:
In the distance measuring device for an automatic focusing camera, the reliability is improved by preventing the device from electric noise, and the structure is simplified so as to provide interchangeability to reduce the production cost. A light receiving lens 2 and a multilayer printed circuit board 3 are mounted on a holder 1. A potting frame 6 is provided on the lens-facing side surface of the printed circuit board 3. An optical sensor 4 and an IC 5 are both mounted within a space 3 enclosed by the potting frame 6, and sealed by a protecting resin 7 simultaneously. Further, resistors S and capacitors C of a distance measuring circuit are mounted on the opposite surface of the printed circuit board 3. Both the surfaces of the printed circuit board 3 are connected to each other via a through hole to construct the distance measuring circuit. The protecting resin 7 transmits light having specified wave lengths. The light reflected from a subject to be photographed is received by the optical sensor 4 after passing through the protecting resin, and a distance to the subject is calculated on the basis of the received light data.
摘要:
A distance measuring device may be constructed utilizing a reduced number of components by calculating distance on the basis of the duration of an integration. Pulsed light is projected toward an object. A selecting circuit selectively outputs one of a pair of output voltages from two current-voltage converting circuits, each of which is connected to a position sensitive device which is configured to receive light reflected from the object. A variable-gain amplifying circuit is used for amplifying the selected output voltage and for producing an amplified output voltage. The output voltage of the amplifying circuit is integrated by an integrating circuit. Reference voltage generating circuitry generates two reference voltages having different levels and a comparing circuit compares the output voltage of the integrating circuit with one of a pair of reference voltages. Gain selecting circuitry is used for determining the gain of the variable-gain amplifying circuit on the basis of the output result of the comparing circuit. The distance to the object is determined in accordance with the duration of time that integration is performed by the integrating circuit until the integrated output voltage exceeds one of the reference voltages. Thus, distance may be determined in accordance with the magnitude of the integrated output voltage, the number of times integration is performed or the number of light projections performed by the device.
摘要:
In order to reduce noise in a controlling circuit including digital circuitry and analog circuitry constructed together on a single CMOS integrated circuit, a regulator is constructed as part of the integrated circuit. A power supply is directly connected to the digital circuitry, and a voltage output of the regulator is supplied to the analog circuitry. The output state of the regulator may be controlled by a switch. Degradation of the performance characteristics of the analog circuitry while the digital circuitry is being operated can be prevented by electrically isolating the power supply to the digital circuitry from the power supply to the analog circuitry. Since the regulator is built into the integrated circuit, the number of externally provided components is thereby reduced, further contributing to the downsizing of an electronic device such as a camera. Furthermore, even when the power supply of the digital circuitry fluctuates greatly, the effects on the analog circuitry are minimized.
摘要:
A distance measuring device for an automatic focusing camera includes a light receiving lens and a multilayer printed circuit board mounted on a holder. A potting frame is provided on the lens-facing side surface of the printed circuit board. An optical sensor and an IC are both mounted within a space enclosed by the potting frame and simultaneously sealed by a protecting resin. Resistors and capacitors of a distance measuring circuit are mounted on the opposite surface of the printed circuit board. The two surfaces of the printed circuit board are connected to each other via a through hole to construct the distance measuring circuit. The protecting resin transmits light having specified wavelengths. The light reflected from a subject to be photographed is received by the optical sensor after passing through the protecting resin, and the distance to the subject is calculated on the basis of the received light data.
摘要:
A camera with a battery checking function is provided with a timer for generating an output signal at predetermined time intervals, a memory for storing a calculated time value, an external switch for generating an activating signal for activating the camera, and a microcomputer for activating the camera in response to the activating signal generated by the external switch, for updating the content of the memory in accordance with the output of the timer at first time intervals when the camera is activated, for placing the camera in a standby mode when the activating signal has not been detected for a predetermined period of time, and for updating the content of the memory in accordance with the output of the timer means at second time intervals, longer than the first time intervals, when the camera is in a standby mode. A voltage detector detects the voltage of a battery at third time intervals when the camera is activated and detects the voltage of the battery at fourth time intervals when the camera is in the standby mode. A display indicates the charge level of the battery.
摘要:
An apparatus for constructing a building (K) is disclosed. The building (K) includes a framework constituted of permanent columns (10) and permanent beams (11). The apparatus (S) is provided with a temporary framework, (13) which is constructed and located above the building (K) under construction. Lifting mechanisms (14) for lifting the temporary framework (13) are provided at and supported by the permanent columns (10) of the building (K). Each of the lifting mechanisms (14) is able to lift the lifting mechanism (14) itself along the permanent column (10) of the building (K). A crane (12, 413, 511) is provided at the temporary framework (13) for hoisting and conveying structural elements (U) of the building (K), for example, the permanent columns (10) and beams (11). Alternatively, movable hoists (131, 607) are provided so as to transfer at least under the temporary framework (13).