Abstract: To keep a printing paste, which is most influential to a printing performance, always in a uniform state, carry out printing at a high accuracy and in a stable manner, and use an expensive paste with no waste, there is provided a printing paste automatic supplying apparatus which supplies a predetermined amount of printing paste (5) by charging the printing paste (5) in a printing paste supply bag (15) and pressurizing the printing paste (5), provided with a mechanism for opening and closing a printing paste supply port (7) by bringing a printing paste supply plate (6) having the printing paste supply port (7) into contact with the back surface side of a squeegee (4) and vertically moving them, and further provided with a scraper (9) which scrapes up the printing paste on a screen printing plate (3).

Abstract: To keep a printing paste, which is most influential to a printing performance, always in a uniform state, carry out printing at a high accuracy and in a stable manner, and use an expensive paste with no waste, there is provided a printing paste automatic supplying apparatus which supplies a predetermined amount of printing paste (5) by charging the printing paste (5) in a printing paste supply bag (15) and pressurizing the printing paste (5), provided with a mechanism for opening and closing a printing paste supply port (7) by bringing a printing paste supply plate (6) having the printing paste supply port (7) into contact with the back surface side of a squeegee (4) and vertically moving them, and further provided with a scraper (9) which scrapes up the printing paste on a screen printing plate (3).

Abstract: To keep a printing paste, which is most influential to a printing performance, always in a uniform state, carry out printing at a high accuracy and in a stable manner, and use an expensive paste with no waste, there is provided a printing paste automatic supplying apparatus which supplies a predetermined amount of printing paste (5) by charging the printing paste (5) in a printing paste supply bag (15) and pressurizing the printing paste (5), provided with a mechanism for opening and closing a printing paste supply port (7) by bringing a printing paste supply plate (6) having the printing paste supply port (7) into contact with the back surface side of a squeegee (4) and vertically moving them, and further provided with a scraper (9) which scrapes up the printing paste on a screen printing plate (3).

Abstract: To keep a printing paste, which is most influential to a printing performance, always in a uniform state, carry out printing at a high accuracy and in a stable manner, and use an expensive paste with no waste, there is provided a printing paste automatic supplying apparatus which supplies a predetermined amount of printing paste (5) by charging the printing paste (5) in a printing paste supply bag (15) and pressurizing the printing paste (5), provided with a mechanism for opening and closing a printing paste supply port (7) by bringing a printing paste supply plate (6) having the printing paste supply port (7) into contact with the back surface side of a squeegee (4) and vertically moving them, and further provided with a scraper (9) which scrapes up the printing paste on a screen printing plate (3).

Abstract: To keep a printing paste, which is most influential to a printing performance, always in a uniform state, carry out printing at a high accuracy and in a stable manner, and use an expensive paste with no waste, there is provided a printing paste automatic supplying apparatus which supplies a predetermined amount of printing paste (5) by charging the printing paste (5) in a printing paste supply bag (15) and pressurizing the printing paste (5), provided with a mechanism for opening and closing a printing paste supply port (7) by bringing a printing paste supply plate (6) having the printing paste supply port (7) into contact with the back surface side of a squeegee (4) and vertically moving them, and further provided with a scraper (9) which scrapes up the printing paste on a screen printing plate (3).

Abstract: Gray scale printing data with compensation for dispersion is stored in a first shift register, the data is sliced into respective bits and is fetched by means of a second shift register and AND-gates. Standard resistances are scanned by means of a third shift register and switches, in synchronization with the data retrieval, for changing standard current, and light emitting current to light emitting bodies is changed according to the standard current.

Abstract: The object of the invention is to provide a small-size image forming apparatus in which a plurality of light emitting element arrays are easily aligned with each other at high accuracy. Each of light emitting element arrays of Y, M, C, K comprises a plurality of LED elements arranged in a straight line and is driven by a color image signal of each color. On the reference plate disposed on the support are arranged head substrates having light emitting element arrays of each color in such a manner that the light emitting element arrays are nearly in parallel with each other. On a peripheral surface of each photosensitive drum, an electrostatic latent image forming position is established where an electrostatic image is formed by receiving light from each of the light emitting element arrays, and toner of the specified color is supplied to the specified electrostatic latent image forming apparatus by each developing device.

Abstract: In an LED head operated on a time sharing basis, a multiplexer switches resistances for determining LED currents on LED arrays and assigns appropriate resistance to each array. The multiplexer is operated by block select signals of a block select circuit for time sharing operation, where the number of resistances corresponds to the number of blocks. The multiplexer capacity may also be less than the number of blocks, where the number of resistances less than the number of blocks and the same resistances correspond to more than one block. Output dispersions between arrays are adjusted by appropriate assignment of the resistances. sharing operation. Capacity of the multiplexer correspond to the number of blocks required for time. Gray scale printing is achieved by switching the current determining resistances in accordance with shading degree of image with the multiplexer.

Abstract: A lens plate is provided with many lenses, and a base plate is provided with many LED arrays and driving ICs arranged at respective opposite ends of the base plate. The lens plate and the base plate are positioned in place relative to each other by spacers. The base plate has a thermal conductive layer and a thermal preserving layer over the layer. Grooves are formed in the preserving layer between the driving ICs and the LED arrays.

Abstract: A plurality of image arrays are sandwiched between a first and a second substrates. The common electrodes of the image arrays are connected to the first substrate; the individual electrodes of the image arrays are connected to the second substrate by flip chip connection. The image arrays are installed in holes of a spacer made by etching a metal plate. Plural lenses are installed in a lens plate made by etching a metal plate; the lens plate is secured to support members for positioning the lenses with respect to the image arrays. The image arrays include a plurality of light elements which may be either light emitter or light receiver elements.

Abstract: An optical print head in an image forming apparatus includes linearly arranged blocks and integrated circuits for driving disposed at one or both ends of the line of blocks. Each of the blocks includes a plurality of light emitting diodes. Positionally corresponding light emitting diodes in each block are connected to one of a plurality of meandering individual signal lines which are connected to the integrated circuits and each block is further connected to a corresponding common signal electrode to which power is selectively applied, thereby making possible illumination and drive of light emitting diodes in each block. The head may include a housing containing the blocks, individual signal lines and common signal electrodes and further include a flexible substrate located outside of the housing connected to and supplying power to the common signal electrodes.

Abstract: This invention relates to an image forming apparatus based on the electrophotographic process, more particularly to the image forming apparatus having an exposure member inside of a photoreceptor member, which develops upon receiving light exposed with the exposure member. The image forming apparatus features to include the exposure member having a plurality of LED elements arrayed along a main scanning line of the photoreceptor member which is exposed with the LED elements in a time sharing manner by n bits unit, and the photoreceptor means having the photoconductive layer formed of amorphous silicon compounds for receiving the light. The photoreceptor member is electrified through brushing contact of the developer carried by the toner support member, and wherein the exposure portion of the exposure means is located in the developer brushing contact region.

Abstract: In an image device wherein rays from LED arrays are guided through single lenses to form an image, LED arrays are arranged on a base plate, single lenses are arranged on a lens plate, the distance between the base plate and the lens plate is kept constant by using a spacer, and the coefficients of thermal expansion of the lens plate, base plate and spacer are made virtually identical to each other.

Abstract: An image head in which storage time is shortened to ease block selection. The image head is provided with means for preventing the influence of storage time. For instance, minority carriers in the switching transistors for driving image blocks are extracted by amplification circuits. Another method is to drive the switching transistors in the non-saturation region to prevent accumulation of minority carriers. The image head is provided with block selection circuit comprising a shift register and a clock counter. The datum is set in the head data set bit of the shift register at the time of resetting. Whenever the clock counter counts clock signals for one image block, the counter will shift the datum by one bit. This datum drives the image blocks.

Abstract: A print head operated on a time sharing basis. Print data are transferred from the outside into the print head in synchronization of clock pulses. The print head stores the print data in a shift register, detects input of print data for one print block portion on the basis of the number of clock pulses, then paralleltransfers the print data in the shift register to a latch circuit and at the same time shifts the print block by one block. When high-speed transfer is possible, the print head releases the external central processing unit or the like from the print head itself for a period from the input of print data of one block portion till the completion of the processing of the block. Moreover, the print head realizes mirror image printing by means of reversal of the order of the print blocks in the print head and reversal of print data in print blocks.

Abstract: A light emitting region of light emitting elements is so configured as to extend in an elongated fashion along the direction of movement of a photosensitive drum to prevent the area of exposure in the direction of movement of the drum from becoming unreasonably small. The width of the light emitting region of the light emitting elements is reduced to restrain unreasonable expanse of emitted light beams. Further, arrangement is made to provide greater current density thereby to obtain increased light intensity, and the distribution of current is equalized to provide uniform light brightness. Through development of finer and more intense light beams in this way, it is possible to inhibit unreasonable expanse of light beams thereby to enable each single light emitting diode to provide sufficient exposure intensity. Thus, the width of continuously printed lines, the width of intermittently printed lines, and the diameter of each dot in one dot printing can be substantially equalized.

Abstract: In a light emitting diode printing head provided with a plurality of LED arrays on which a plurality of LEDs are formed, a prior art driving circuit element is connected to each LED array. One or a plurality of driving circuit elements is disposed at least one end of the plurality of LED arrays, each LED array is sequentially connected by snaky individual signal lines, and the transmitting direction of printing data into a driving circuit element is alternately changed between one direction and another, inverted direction.

Abstract: In an optical printer head or image reading apparatus, light emitting diodes, photo detectors and other picture elements are formed, by a specified number of pieces individually, as picture element arrays, and these arrays are linearly arranged. The distance of the picture elements at the adjacent outermost positions of the arrays, that is, the distance between the arrays, and the position of the heightwise direction of the arrays must be composed to be identical. Accordingly, the positioning marks are formed in the arrays in the same manufacturing process of the picture elements, and the distance between the arrays is adjusted at high precision. The arrays are affixed to the wiring substrate with an adhesive, and at this time by adjusting the layer thickness of the adhesive, the positions in the heightwise direction of the array surface are identically controlled.

Abstract: An optical printer head using LEDs, which is a form of image forming apparatus, comprises a plurality of arrays formed from a plurality of LEDs arranged in a straight line, the LEDs disposed symmetrically to each other in adjacent arrays being connected to respective individual signal lines formed in a cranked pattern extending from one array to the next, to supply printing data. Because the arranging order of the LEDs relative to the individual signal lines is reversed between adjacent arrays, prior art has required the provision of an external circuit for alternately reversing the arranging order of image data from one array to the next. On the other hand, according to the present invention, the optical printer head contains a hardware circuit configuration for reversing the arranging order of the input image data each time a signal generated for each array is supplied.