摘要:
A range finder system to detect distance to an object by irradiating radiation toward an object, a distance to which is to be detected based on the principle of a base line range finder and receiving radiation being reflected by said object. It is particularly characterized by that a distance to an object is detected by irradiating a photoelectric conversion means with radiation and then comparing the signal outputted by said photoelectric conversion means with a prescribed reference signal. And the system of the present invention has, for that end, a radiation generation source to generate radiation, a light receiving system being positioned with a prescribed base line distance from said radiation generation source for receiving the reflected radiation being emitted by the radiation generation source and reflected by the object, a photoelectric conversion means to take in the radiation from said light receiving system being reflected by said object, an oscillating device having such function as intermittently irradiating the above mentioned photoelectric conversion means with the radiaton reflected by the above mentioned object within the radiation path between said photoelectric conversion means and the above mentioned radiation source, a reference signal generation means to generate reference signal, and a signal comparison means to compare the signal generated by the above mentioned photoelectric conversion means and the above mentioned reference signal.
摘要:
A camera having an objective and visual or automatic focusing means for the objective. For assistance in bringing into sharpest focus an image of an object formed by the objective at the focal plane of the camera, there is provided a sharp focus detecting apparatus constructed in the form of an attachment unit attachable to and detachable from the camera and essentially comprising an optical system subsidiary to the objective, photoelectric means arranged upon receiving light coming from the object through the objective and subsidiary optical system for producing an electrical output signal proportional to the degree of sharpness of the image and oscillatory motion imparting means or scanning means associated with the photoelectric means for periodically varying the spatial relationship along the projection path between the photoelectric means and the subsidiary optical system.
摘要:
The present invention relates to a method and a system for detecting the sharpness of the object image by detecting the amount of the component of a certain specified frequency, whereby the object image formed by means of an image forming optical system is detected by an image sensitive element consisting of a number of fine photo sensitive elements arranged respectively integrated on one plane, while the outputs of the above mentioned photo sensitive elements are delivered out one after another in accordance with the arrangement order of the above mentioned elements by means of a signal time series means so as to carry out an electrical scanning of the above mentioned object image in such a manner that the then obtained scanning outputs of the object image are successively converted by means of an A - D (analogue-digital) converting means into digital signals which are put in a small computer in which an estimation function for estimating the amount of the component of a certain specified frequency in the spectrum of the spacial frequencies of the object light beam forming the above mentioned object image is programmed in advance.
摘要:
The present invention relates to a photo-electric conversion element suitable for use in a system for detecting object image visibility and a method for detecting object image visibility employing the same and also relates to a device therefor. The photo-electric conversion element is characterized by having a first electrode at both ends of the direction along with a short side of a photo-semiconductor which has an extremely shorter short side as compared to its long side, and having a second electrode discretely formed at both ends of the direction along with its long side. Further an element with electrical characteristics being non-linear is connected to or formed at each of the above mentioned electrodes.
摘要:
A method and an apparatus is disclosed for detecting the sharpness of the object image suited for optical instruments such as a camera and for adjusting the focus of the optics by means of photoelectric means presenting a non-linear resistance-illumination characteristics such as CdS or CdSe. Such an object image may be formed by means of the optics on the above mentioned photoelectric means presenting the electrodes at both ends along the longer side of a photoelectric semiconductor whose longer side is extremely long as compared with the shorter side as well as on the above mentioned photoelectric means presenting the electrodes at both ends along the shorter side of the photoelectric semiconductor. An object distance measuring system which digitally displays the distance between camera and photographing object when an automatic focusing operation is carried out is also disclosed.
摘要:
The present invention relates to a method and a device for detecting visibility of the image of an object for adjusting the focus of an optical system. The invention is especially suitable to an optical instrument such as camera, using photo-electric conversion elements having non-linear resistance -- intensity of illumination characteristics such as cadmium sulfide CdS or cadmium selenide CdSe, etc. The invention is characterized in that the photo-electric effect of the above mentioned photo-electric conversion elements will have mutually reverse characteristics depending on the properties inherent to the photo-electric conversion elements, to the arrangement of the electrode and the electric circuit, and further on the state of the image of an object formed on said photo-electric conversion elements. An electric circuit to enhance object image visibility is disclosed which makes use of these characteristics.
摘要:
An image sharpness detecting system employing two photoconductive cells of different geometry which permits detection of an optimum degree of sharpness of an image formed thereon regardless of variation in the direction of light distribution of the image relative to the electrodes of the cells. Differences between light response characteristics of these two cells due to the different geometry thereof are compensated for by providing optical means such as filter arranged between the cells, whereby the system is made accurately and reliably responsive to variation of light distribution even at low total light levels.
摘要:
A system for detecting the distinction of the object image characterized in that respectively on a photoelectric transducing element presenting electrodes on both extremities along the longer sides of a photoelectric semiconductor presenting considerably short sides as compared with the long sides and on a photoelectric transducing element presenting electrodes on both extremities along the shorter sides of a photoelectric semiconductor presenting considerably short sides as compared with the long sides an object image is formed by means of an optics and that the distinction of the above mentioned object image is detected by detecting the electric characteristics variable corresponding to the distinction of the above mentioned object image, of each of the above mentioned photoelectric transducing elements.
摘要:
This invention relates to a system for automatic focus adjustment of an optical system particularly adapted for use in a photographic camera which utilizes non-linear resistance versus illumination response characteristics which are prominent in photoconductive cells such as cadmium sulfide and cadmium selenide cells. In one embodiment, a pair of photoconductive cells, one of which has a photoconductive surface having elongated side portions which contact the electrodes along the length of the elongated side portions and another cell which has an elongated photoconductive surface and shortened end portions and which contact the electrodes only at the shortened end portions, are arranged so that portions of an image-forming light beam entering through an objective of the camera are directed to the photoconductive surfaces on which similar real images of an object are formed. The objective includes at least one lens member movable for focusing associated with an automatic focus control mechanism operative in response to variation of an electrical output signal of the photoconductive cell assembly produced when the degree of sharpness of the image on each of the photoconductive surfaces is varied as the focussing member is moved for focussing purposes with respect to the photoconductive cell assembly.
摘要:
In the disclosed optical distance measuring system, a pair of mirrors spaced from each other along a base line direct light coming from a scene along two optical paths onto reflecting surfaces of a prism positioned between them and through a pair of image forming lenses positioned between the prism and the mirrors so that the prism forms images of the scene on respective photoelectric element arrays. A light baffle in front of the photoelectric element arrays forms an aperture for limiting a desired field of view and includes a light shading projection at the edge of the aperture for preventing light rays from the lenses and outside the desired field of view from impinging upon the arrays.