Abstract: An object of the present invention is to provide a 2,6-dioxo-3,6-dihydropyrimidine compound that has excellent bactericidal and antimicrobial activity, has excellent safety, and can be industrially favorably synthesized, and an agricultural and horticultural fungicide, a nematicide, and an antifungal agent for use in medicine/animals that contain the compound as an active ingredient.

Abstract: Disclosed is a non-thermofusible phenol resin powder having an average particle diameter of not more than 20 ?m and a single particle ratio of not less than 0.7. This non-thermofusible phenol resin powder preferably has a chlorine content of not more than 500 ppm. This non-thermofusible phenol resin powder is useful as an organic filler for sealing materials for semiconductors and adhesives for semiconductors. The non-thermofusible phenol resin powder is also useful as a precursor of functional carbon materials such as a molecular sieve carbon and a carbon electrode material.

Abstract: Disclosed is a thermofusible and thermosetting phenol resin powder having an average particle diameter of not more than 20 ?m and a single particle ratio of not less than 0.7. This phenol resin powder preferably has an average particle diameter of not more than 10 ?m, a variation coefficient of the particle size distribution of not more than 0.65, a particle sphericity of not less than 0.5 and a free phenol content of not more than 1000 ppm. Also disclosed are a dispersion liquid of such a phenol resin powder, and a method for producing a phenol resin powder having such characteristics.

Abstract: Disclosed is a non-thermofusible phenol resin powder having an average particle diameter of not more than 20 ?m and a single particle ratio of not less than 0.7. This non-thermofusible phenol resin powder preferably has a chlorine content of not more than 500 ppm. This non-thermofusible phenol resin powder is useful as an organic filler for sealing materials for semiconductors and adhesives for semiconductors. The non-thermofusible phenol resin powder is also useful as a precursor of functional carbon materials such as a molecular sieve carbon and a carbon electrode material.

Abstract: Disclosed is a non-thermofusible phenol resin powder having an average particle diameter of not more than 20 ?m and a single particle ratio of not less than 0.7. This non-thermofusible phenol resin powder preferably has a chlorine content of not more than 500 ppm. This non-thermofusible phenol resin powder is useful as an organic filler for sealing materials for semiconductors and adhesives for semiconductors. The non-thermofusible phenol resin powder is also useful as a precursor of functional carbon materials such as a molecular sieve carbon and a carbon electrode material.

Abstract: Disclosed is a non-thermofusible phenol resin powder having an average particle diameter of not more than 20 ?m and a single particle ratio of not less than 0.7. This non-thermofusible phenol resin powder preferably has a chlorine content of not more than 500 ppm. This non-thermofusible phenol resin powder is useful as an organic filler for sealing materials for semiconductors and adhesives for semiconductors. The non-thermofusible phenol resin powder is also useful as a precursor of functional carbon materials such as a molecular sieve carbon and a carbon electrode material.

Abstract: Disclosed is a non-thermofusible phenol resin powder having an average particle diameter of not more than 20 ?m and a single particle ratio of not less than 0.7. This non-thermofusible phenol resin powder preferably has a chlorine content of not more than 500 ppm. This non-thermofusible phenol resin powder is useful as an organic filler for sealing materials for semiconductors and adhesives for semiconductors. The non-thermofusible phenol resin powder is also useful as a precursor of functional carbon materials such as a molecular sieve carbon and a carbon electrode material.

Abstract: Disclosed is a thermofusible and thermosetting phenol resin powder having an average particle diameter of not more than 20 ?m and a single particle ratio of not less than 0.7. This phenol resin powder preferably has an average particle diameter of not more than 10 ?m, a variation coefficient of the particle size distribution of not more than 0.65, a particle sphericity of not less than 0.5 and a free phenol content of not more than 1000 ppm. Also disclosed are a dispersion liquid of such a phenol resin powder, and a method for producing a phenol resin powder having such characteristics.

Abstract: Disclosed is a non-thermofusible phenol resin powder having an average particle diameter of not more than 20 ?m and a single particle ratio of not less than 0.7. This non-thermofusible phenol resin powder preferably has a chlorine content of not more than 500 ppm. This non-thermofusible phenol resin powder is useful as an organic filler for sealing materials for semiconductors and adhesives for semiconductors. The non-thermofusible phenol resin powder is also useful as a precursor of functional carbon materials such as a molecular sieve carbon and a carbon electrode material.

Abstract: Disclosed is a non-thermofusible phenol resin powder having an average particle diameter of not more than 20 ?m and a single particle ratio of not less than 0.7. This non-thermofusible phenol resin powder preferably has a chlorine content of not more than 500 ppm. This non-thermofusible phenol resin powder is useful as an organic filler for sealing materials for semiconductors and adhesives for semiconductors. The non-thermofusible phenol resin powder is also useful as a precursor of functional carbon materials such as a molecular sieve carbon and a carbon electrode material.

Abstract: A focus detecting apparatus has, an imaging optical system for forming an image of an object on a predetermined plane, an array having a plurality of photoelectric conversion elements arranged at predetermined interval, a focus detecting optical system for directing to the photoelectric conversion element array the light beam from the object passed through the imaging optical system, and discrimination apparatus for discriminating the imaged condition of the image of the object on the predetermined plane on the basis of the signal output of the image of the object spatially sampled at a predetermined sampling interval by the focus detecting optical system and the photoelectric conversion element array.

Abstract: This specification discloses a focus detecting optical device for photoelectrically effecting focus delection by the use of two restricted light beams passed through different areas in the pupil of a phototaking lens in a single lens reflex camera including a finder screen capable of imaging the light beam from the phototaking lens and a pentaprism having reflecting surfaces capable of reflecting a light beam passed through said screen toward an eyepiece lens system having an optical axis substantially orthogonal to said screen.

Abstract: A lens information introducing device in a camera comprises a photoelectrically legible digital code pattern provided on a lens, optical means for introducing the code pattern into a camera body and imaging the same at a predetermined position, photoelectric converter means disposed at the predetermined position for photoelectrically converting the image of the code pattern formed by the optical means, and shaping means for comparing the photoelectrically converted signal by the photoelectric converter means with a standard signal and generating the lens information indicated by the code pattern as a digital signal.

Abstract: A lens information introducing device in a camera comprises n bits of code patterns provided on a lens and photoelectrically legible, optical means for introducing the code patterns into a camera body and imaging the same at a predetermined position, and photoelectric converter means disposed at the predetermined position and having n photoelectric converting elements corresponding to the code patterns and being effective to produce a digital electrical signal corresponding to the lens information on the basis of the photoelectric signals produced by the photoelectric converting elements.

Abstract: A TTL metering device in a single lens reflex camera for measuring light passed through the picture-taking objective lens of the camera comprises a light-sensing element for receiving the light passed through the picture-taking objective lens to produce an output corresponding to the intensity of the light, a jump-up mirror having a light-transmitting area through which the light may be transmitted, and diffusion means for permitting the light transmitted through the light-transmitting area of the jump-up mirror to reach the light-sensing element.

Abstract: An electro-optical light control element comprises a pair of transparent electrodes disposed in a predetermined spaced apart relationship, a layer of electro-optical substance disposed between the transparent electrodes and having a light transmission factor variable in accordance with a voltage applied thereto, and a substrate supporting thereon the transparent electrodes and the layer of electro-optical substance. The transparent electrodes and the layer of electro-optical substance together form a control area for controlling the quantity of light passing the transparent electrodes and the layer of electro-optical substance. Conductor electrodes are provided around the control area at a plurality of locations on one of the transparent electrodes and at least one location on the other transparent electrode so that the distribution of the light transmission factor within the control area may be made to substantially conform to a predetermined distribution characteristic.

Abstract: A light receiving device for a photoelectric conversion element in an exposure meter etc., wherein a light converging optical system and a photoelectric conversion element are held in intimate contact with a transparent elastic sheet interposed therebetween.

Abstract: An exposure control device in a camera comprises light intercepting means disposed between a picture-taking lens and a film and in the light path of the picture taking lens and retractable out of the light path by operation of a shutter release member, electro-optic light control means disposed in the light path of the picture-taking lens and having its transmittivity to light variable by an electrical signal, and control means operable in response to the retracting movement of the light intercepting means out of the light path to apply a first signal to the light control means for increasing its transmittivity, apply a second signal to the light intercepting means for returning the same to the light path in order to terminate the exposure of the film to light, and apply a third signal to the light control means for decreasing it transmittivity to a minimum.

Abstract: In a single lens reflex camera having a metering device, a principal mirror is provided for reflecting part of the light passing through an objective lens toward a finder optical system and for transmitting therethrough the remainder of the light. First optical means including a reflector member are disposed between the principal mirror and photographic film in inclined relationship with the optical axis of the objective lens. A condensing mirror extends between the image of an object formed by the objective lens and the first optical means and the light-receiving portion of the metering device. An image-forming half-lens is provided on the condensing mirror to condense the image of the object toward the light-receiving portion by cooperating with the condensing mirror. The optical axis of the half-lens is substantially coincident with the reflecting surface of the condensing mirror.

Abstract: In a numerical display element comprising seven segments, the horizontally extending central segment of the seven segments is divided into two parallel segments. On end of each of the two parallel segments is connected to an adjacent discrete segment. Thus, the numerical display element is formed by six segments.