Abstract: Transparent solid, fused microspheres are provided. In one embodiment, the microspheres contain alumina, zirconia, and silica in a total content of at least about 70% by weight, based on the total weight of the solid, fused microspheres, wherein the total content of alumina and zirconia is greater than the content of silica, and further wherein the microspheres have an index of refraction of at least about 1.6 and are useful as lens elements.

Abstract: An acrylic polymer powdery material, which is a particularly useful powdery material as a modifier for cementitious material, comprising fine particles of a core-shell structure comprising a core polymer being comprised of an acrylic polymer having a glass transition temperature (Tg) of −20-+15° C., a weight average molecular weight of 100000-2000000, an acid value of 25 mg KOH/g or less and a shell polymer being comprised of an acrylic polymer having a Tg of 50-90° C., a weight average molecular weight of 100000-2000000, an acid value of 30-130 mg KOH/g, wherein the weight ratio of the core polymer and shell polymer is 30/70-80/20 (% by weight).

Abstract: Acrylic polymer fine particles which comprise primary particles P of 250 nm or more in average particle diameter having a core shell structure and plastisols prepared using the same.

Abstract: Transparent solid microspheres that contain titania plus alumina, zirconia, and/or silica in a total content of at least about 75% by weight, based on the total weight of the solid microspheres, wherein the total content of alumina, zirconia, and titania is greater than the content of silica.

Abstract: An image forming apparatus of the present invention includes a conveyer belt for conveying an image receiving medium toward an image carrier, an image transferring member for electrostatically transferring a developed image formed on the image carrier onto the image receiving medium conveyed by the conveyer belt by applying an electric charge through the back of the conveyer belt, and an adsorbing roller provided on the surface of the conveyer belt facing it for electrostatically adsorbing the image receiving medium to the conveyer belt. The electric resistance of the conveyer belt from a first position where the conveyer belt and the adsorbing roller are facing each other to a second position where the conveyer belt and the image carrier are facing each other is larger than the electric resistance between the image carrier and the image transferring member.

Abstract: An image forming apparatus includes at least two developing units containing two types of developing agents of different colors. This image forming apparatus is improved in the following points. i) The triboelectric charging amounts of the toner of the developing agents are reduced in the order of transfer. ii) The volume resistivities of the developing agents are reduced in the order of transfer. iii) The charging potentials of image carriers when electrostatic latent images corresponding to individual developing agents are formed are reduced in the order of transfer.

Abstract: A color printer includes a conveyer belt for conveying a paper sheet to make the sheet pass through a plurality of photoconductive drums. A suction roller for sucking a supplied paper sheet on the conveyer belt is provided on the upstream side of the photoconductive drums in the conveying direction of the paper sheet, such that the suction roller is in rolling contact with the belt. Transfer chargers are provided at positions opposing the photoconductive drums, respectively, with the conveyer belt situated between the drums and the transfer chargers. The running distance L1 (mm) of the conveyer belt from a sheet peeling position corresponding to the photoconductive drum at the rearmost position to a suction position where the suction roller is provided, the volume resistance .rho. (.OMEGA..multidot.cm) of the belt, and the relative dielectric constant .epsilon. of the belt are set so as to satisfy a relation of L1/V.gtoreq.(.epsilon..multidot..epsilon..sub.0 .multidot..rho.).times.7.

Abstract: This apparatus forms a multiplex image on a sheet of paper conveyed on a conveyor belt through a plurality of image forming stations and prevents any misregistration between the images on the paper by using a first charger to charge the conveyor belt and a second charger for charging the paper on the conveyor belt. The first charger supplies the conveyor belt with an electrical charge of a predetermined polarity before the paper is supplied thereon. The second charger charges the paper on the conveyor belt with an electrical charge of a polarity opposite to the predetermined polarity.

Abstract: A developing roller is opposed to a photosensitive drum on which a latent image is carried, and developer supplied to the latent image is held and fed by the developing roller. Developer is supplied from a feeding roller to the developing roller. A thickness defining blade is pressed against the feeding roller to press the feeding roller against the developing roller and form a developer layer of certain thickness on the feeding roller. A developing device thus arranged enables developer to be electrically charged without adding any stress to the developer, and a developer layer of certain thickness to be formed.

Abstract: A mold clamping device in an injection molding machine comprising a stationary electromagnetic plate and a movable electromagnetic plate provided at the side of the stationary electromagnetic plate away from the movable platen so as to be capable of being moved toward and away from the stationary electromagnetic plate. Both electromagnetic plates are each provided with an electromagnetic coil for generating a magnetic attracting force. The device further comprises a movable platen driving mechanism which is composed of a combination of a feed screw shaft and a nut member and is connected to the movable platen. An operation for closing the molds is performed by the driving mechanism. Subsequently, a mold clamping operation of both molds is performed by a magnetic attracting force from the electromagnetic coil.

Abstract: An image forming apparatus having a humidity detector which is detachably attached to the main apparatus body that accommodates an image forming member. The humidity detector detects a humidity in the vicinity of the image forming member, converts the detected humidity into a relative humidity and outputs it. Based on the value of the output relative humidity, image forming conditions, such as the amount of exposure, are set. The humidity detecting unit contains a time detecting unit for detecting the time for replacement.

Abstract: An image forming apparatus having a static latent image forming unit for forming a static latent image corresponding to an original image on an image carrying member, a first developing unit for developing the static latent image, formed by the static latent image forming unit, by a first magnetic developing agent containing a magnetizable magnetic material, so as to form a first developing agent image, a fixing unit for fixing the first developing agent image, formed by the first developing unit, on the image carrying member, a magnetizing unit for magnetizing the first developing agent image fixed by the fixing unit, so as to form a magnetic latent image, a second developing unit for developing the magnetic latent image by a second magnetic developing agent whose magnetic material content is lower than that of the first magnetic developing agent, so as to form forming a second developing agent image, and a transferring unit for transferring the second developing agent image to a recording medium.

Abstract: The invention provides a printing apparatus. The said printing apparatus comprises thermosensitive adhesive paper and a thermal recording head. The printing apparatus heats the thermal recording head to form a thermal pattern image on the thermosensitive adhesive paper. The imaging part on the thermosensitive adhesive paper then becomes adhesive, causing the first developer adhere to the adhesive imaging part on the thermosensitive adhesive paper. Then the first developer is magnetized. After being adhered to the first developer, the second developer is transferred to the paper. The printing apparatus prints manuscripts rapidly using the master image formed by the first developer.

Abstract: The particles of a first magnetic developing agent are electrostatically attracted to the electrostatic latent image formed on a photosensitive belt, thus forming a first developer image. An AC voltage having a frequency f [Hz] is applied to a magnetic head. The head magnetizes the first developer image, thereby forming a master image. The frequency f satisfies the following inequality: ##EQU1## where V [mm/sec] is the speed at which the developer image moves relative to the magnetic head, and Dt [.mu.m] is the average particle size of a second magnetic developing agent. The particles of the second magnetic developing agent are attracted to the magnetized master image, thus forming a second developer image. The second developer image is transferred from the photosensitive belt onto a sheet of paper.

Abstract: A recording apparatus according to the present invention in which a data is recorded by charging a recording medium, scanning laser beams on the recording medium to form electrostatic latent images thereon, and developing and transferring the electrostatic latent image, comprises a charger for charging the recording medium; and at least two image forming device disposed around the recording medium for recording multi-colored and/or uni-colored data in a plurality of print modes. In the recording apparatus, the print modes is controlled so as to drive the second image forming device corresponding to the second print mode after the operation of the first print mode is closed, when the second print mode is designated in the operation of the first image forming means corresponding to the first print mode. And, the driver for driving the recording medium is controlled so as to continuously drive the recording medium when the first print mode is switched to the second print mode by the switching device.

Abstract: A recording apparatus according to the present invention in which a data is recorded by charging a driven recording medium, scanning laser beams on the driven recording medium to form electrostatic latent images thereon, and developing and transferring the electrostatic latent image, comprises a charger for charging the driven recording medium; and at least two image forming device disposed around the recording medium for recording multi-colored and/or uni-colored data in a plurality of print modes. In the recording apparatus, the print modes is controlled so as to drive the second image forming device corresponding to the second print mode after the operation of the first print mode is closed, when the second print mode is designated in the operation of the first image forming means corresponding to the first print mode.

Abstract: A recording apparatus having a photosensitive body, a charger for charging the photosensitive body, an exposure unit for forming a latent image on the photosensitive body charged by the charger, and a developing unit for developing the latent image into a visible image on the photosensitive body. The recording apparatus also includes a first surface potential sensor for measuring the surface potential of the photosensitive body before the latent image has been developed by the developing unit, a second surface potential sensor for measuring the surface potential of the photosensitive body after the latent image has been developed by the developing unit, a computer for computing the surface potential of the photosensitive body at a position between the first and second surface potential sensors to estimate the surface potential at the position of the developing unit, and a controller for controlling the charger so that the estimated surface potential becomes a determined level.

Abstract: A recording apparatus according to the present invention in which a data is recorded by charging a drived recording medium, scanning laser beams on the drived recording medium to form electrostatic latent images thereon, and developing and transferring the electrostatic latent image, comprises a charger for charging the drived recording medium; and at least two image forming device disposed around the recording medium for recording multi-colored and/or uni-colored data in a plurality of print modes. In the recording apparatus, the print modes is controlled so as to drive the second image forming device corresponding to the second print mode after the operation of the first print mode is closed, when the second print mode is designated in the operation of the first image forming means corresponding to the first print mode.

Abstract: In a developing system, a first latent image is formed on a photoconductive drum which is rotated in a direction and is developed by a black toner fed from a first developer. A second latent image is also formed on a rotated photoconductive drum and is also developed by a chromatic toner fed from a second developer. The first and second developers are arranged around the rotated photoconductive drum and are rotated in a direction opposite to the rotated direction of the photoconductive drum. The first developer is rotated at a predetermined peripheral velocity higher than that of the drum and the second developer is rotated at a predetermined peripheral velocity equal to that of the drum.

Abstract: Single-colored image printing and multi-colored image printing are carried out by an image forming apparatus in response to color signals. The image forming apparatus includes an image carrier, a first image forming unit having a first developer wherein a first color developing agent is stored, and a second image forming unit having a second developer wherein a second color developing agent is stored.A single color image is formed on the image carrier when only a first color signal is received by the apparatus in the single-colored image printing. When a single-colored image printing is carried out by the first developer, a prescribed bias voltage is applied to the second developer to prevent the second color developing agent from the contamination by the first color developing agent of the single color image formed on the image carrier.