Abstract: When a projection lens system used for a rear projection type image display apparatus has a first lens group having an aspherical lens surface, a second lens group, a third lens group sharing almost all the positive refractive power of the overall system, a fourth lens group having an aspherical lens surface, a fifth lens group, and a sixth lens group including a lens having a profile of aspherical surface in which the concave surface thereof faces the screen side and the refractive power in the marginal area is weaker than the refractive power around the optical axis, a projection lens system having a large aperture ratio (low F-number), high focus, wide field angle, and sufficient marginal light amount ratio can be realized at a low cost. When a predetermined opening portion is formed in the projection lens and lens barrel, the lens elements are cooled by air suction and exhaust and the lowering of the lens performance due to temperature change can be prevented.

Abstract: For obtaining both high brightness under condition of small-sized and simplified structure and suppression of increase in temperature of liquid crystal display elements and polarizing elements, in a liquid crystal display apparatus, comprising: a liquid crystal display element 2 for converting light from a light source into display picture depending on a driving signal; an optical projection system 1b containing a first optical element 1a and for projecting said light signal toward an object of projection; exit side polarizing elements 3b; a holding member 6 for holding them with the liquid crystal display element 2; and cooling medium 5; incident side polarizing elements 3a, wherein, a space is defined by either one of the incident side polarizing elements 3a and the liquid crystal display element 2, the first optical element 1a, between the liquid crystal display element 2 and the first optical element 1a, and the holding member 6, and said space is filled up with the cooling medium 5.

Abstract: A projection display apparatus including an optical modulator for modulating an incident light from a light source, and a projection lens device for projecting the light modulated by the optical modulator. The optical modulator includes a liquid crystal panel, a cooling liquid filled up at least within a space defined between the liquid crystal panel and a lens of the projection lens device which is located closest to a light source side, and a polarizing plate. The polarizing plate is positioned in the space so that opposite surfaces of the polarizing plate contact the cooling liquid.

Abstract: When one or more storage data are coincident with single search data (105), an associative memory with a shortest mask producing function carries out logical multiplication for all of mask information corresponding to the coincident storage data with a mask valid state as true. The result of logical multiplication is used as shortest mask information. In a primary searching operation, the associative memory with a shortest mask producing function is supplied with the search data (105) to provide the shortest mask information on shortest mask lines. Then, as a secondary searching operation, the shortest mask information thus extracted is used as the search data and supplied to the associative memory with a shortest mask producing function. Among the coincident storage data, only a mask match line connected to a particular word having mask information coincident with the shortest mask information is selected as the secondary search result.

Abstract: For obtaining both high brightness under condition of small size and simplified structure, and for achieving suppression of increase in temperature of liquid crystal display elements and polarizing elements in a liquid crystal display apparatus, a liquid crystal display element converts light from a light source into a display picture depending on a driving signal, and an optical projection system contains a first optical element and projects a light signal toward an object of projection. A space is defined by an incident side polarizing element or the liquid crystal display element, the first optical element and a holding member, and the space is filled up with a cooling medium.

Abstract: When a projection lens system used for a rear projection type image display apparatus has a first lens group having an aspherical lens surface, a second lens group, a third lens group sharing almost all the positive refractive power of the overall system, a fourth lens group having an aspherical lens surface, a fifth lens group, and a sixth lens group including a lens having a profile of aspherical surface in which the concave surface thereof faces the screen side and the refractive power in the marginal area is weaker than the refractive power around the optical axis, a projection lens system having a large aperture ratio (low F-number), high focus, wide field angle, and sufficient marginal light amount ratio can be realized at a low cost. When a predetermined opening portion is formed in the projection lens and lens barrel, the lens elements are cooled by air suction and exhaust and the lowering of the lens performance due to temperature change can be prevented.

Abstract: An associative memory with a shortest mask output function has data cells, mask cells, comparators for the data cells, comparators for the mask cells, a first bit lines for inputting compared bits to the data cell comparators, and a second bit lines for inputting compared bits to the mask cell comparator, a search data are input to the first bit line and bit data corresponding to the shortest mask lines are input to the second bit line.

Abstract: In a multiple determination apparatus for determining whether or not a dividend is a multiple of a divisor which is represented by D=.alpha..multidot.2.sup.r where .alpha. is an odd number and r is 0, 1, 2, . . . , a non-zero determination circuit determines whether or not a remainder of a division of the dividend by 2.sup.r is zero. A selector circuit replaces a first number with a quotient of the division. An operational circuit determines whether or not a greatest common measure between .alpha. and the first number coincides with .alpha., when the remainder is zero. Thus, it is determined that the dividend is a multiple of the divisor when the greatest common measure coincides with .alpha..

Abstract: An image display device which is compact on the whole and low in cost, and which uses a plurality of projection lens systems each of which is constituted by five lens groups including a first aspherical lens group, a second aspherical lens group, a third biconvex lens group, a fourth aspherical lens group and a fifth aspherical lens group which are arranged in this order successively from a screen side, the third lens group having refractive power of not lower than 70% of the total power of the projection lens system, the respective peripheral shapes of the first and second aspherical lens groups being set to have a predetermined relation, a low-dispersion high-index glass material being used for a convex lens of a green projection lens system, a high-dispersion high-index glass material being used for convex lenses of blue and red projection lens systems.

Abstract: A projection lens device for extensively projecting an original image being displayed on an image source, such as a liquid crystal panel, upon a screen, comprising in sequence from the screen: a first lens group having a negative refractive power as an entire system thereof, and including at least a meniscus lens of negative refractive power, which has a convex surface toward the screen side; a second lens group having a positive refractive power as an entire system thereof, and including cemented lenses having a negative refractive power, one of which has convex surfaces at both sides and a first Abbe's number and the other of which has concave surfaces at both sides and a second Abbe's number being smaller than the first Abbe's number; and a third lens group having a negative refractive power as an entire system thereof, and including at least a lens which has a concave surface at a center thereof toward the screen.

Abstract: The projection image display apparatus includes a plurality of image generating sources for generating three primary colors, including red, green, blue image light, respectively, and a projection lens containing a plurality of lens elements provided in correspondence with each of said image generating sources for enlarging/projecting images displayed by the image generating sources onto a screen. The projection lens corresponding to the red image generating source includes a light transmitter that satisfies the condition: TRS<TRL/3, wherein TRS is the transmittance with respect to a wavelength .lambda. RSmax of sub-peak energy of a spurious component existing in a short-wavelength-sided region rather than a peak energy waveform .lambda. Rmax of a spectral distribution of the red image light, and TRL is the transmittance with respect to a wavelength .lambda. RLmax of sub-peak energy of a spurious component existing in a long-wavelength-sided region rather than the peak energy wavelength .lambda.

Abstract: A taping member supporting device is used in an electronic component feeding apparatus, and supports a taping member having electronic components thereon and wound around a tape reel. The supporting device includes an elongated supporting member contacting a lower side portion of the taping member at an outermost feeding side thereof to rotationally support the taping member thereon. An attaching member is connected to the supporting member to attach the supporting member to an electronic component feeding apparatus.

Abstract: To increase access speed, a moving image communication system includes a transmitter for outputting a packet including a predetermined number of subpackets containing a first information and a second information, and a receiver for receiving the packet. The receiver includes a memory for storing the first information, a counter for counting a number of the first information read out from the memory, an image processor for receiving the first information from the memory, and for generating an output signal of the receiver based on the first information, and a controller for controlling the image processor to output the output signal, when the counter counts the predetermined number.

Abstract: When a projection lens system used for a rear projection type image display apparatus has a first lens group having an aspherical lens surface, a second lens group, a third lens group sharing almost all the positive refractive power of the overall system, a fourth lens group having an aspherical lens surface, a fifth lens group, and a sixth lens group including a lens having a profile of aspherical surface in which the concave surface thereof faces the screen side and the refractive power in the marginal area is weaker than the refractive power around the optical axis, a projection lens system having a large aperture ratio (low F-number), high focus, wide field angle, and sufficient marginal light amount ratio can be realized at a low cost. When a predetermined opening portion is formed in the projection lens and lens barrel, the lens elements are cooled by air suction and exhaust and the lowering of the lens performance due to temperature change can be prevented.

Abstract: When a projection lens system used for a rear projection type image display apparatus has a first lens group having an aspherical lens surface, a second lens group, a third lens group sharing almost all the positive refractive power of the overall system, a fourth lens group having an aspherical lens surface, a fifth lens group, and a sixth lens group including a lens having a profile of aspherical surface in which the concave surface thereof faces the screen side and the refractive power in the marginal area is weaker than the refractive power around the optical axis, a projection lens system having a large aperture ratio (low F-number), high focus, wide field angle, and sufficient marginal light amount ratio can be realized at a low cost. When a predetermined opening portion is formed in the projection lens and lens barrel, the lens elements are cooled by air suction and exhaust and the lowering of the lens performance due to temperature change can be prevented.

Abstract: An image display device which is compact on the whole and low in cost, and which uses a plurality of projection lens systems each of which is constituted by five lens groups including a first aspherical lens group, a second aspherical lens group, a third biconvex lens group, a fourth aspherical lens group and a fifth aspherical lens group which are arranged in this order successively from a screen side, the third lens group having refractive power of not lower than 70% of the total power of the projection lens system, the respective peripheral shapes of the first and second aspherical lens groups being set to have a predetermined relation, a low-dispersion high-index glass material being used for a convex lens of a green projection lens system, a high-dispersion high-index glass material being used for convex lenses of blue and red projection lens systems.

Abstract: A memory has a plurality of word lines WL1-8, a plurality of bit lines BL1-512 and BLa1-32, a plurality of memory cells C1-512 and Ca1-32, each of memory cells C1-512 and Ca1-32 are connected between selected one of said word lines WL1-8 and selected one of said bit lines BL1-512 and BLa1-32, said plurality of memory cells C1-512 and Ca1-32 connected to said selected one of said word lines WL1-8 are divided into a first group memory cells C1-512 and a second group memory cells Ca1-32,said first group memory cells C1-512 are provided for storing data and said second group memory cells Ca1-32 are provided for storing attribute data of said first group memory cells C1-512.

Abstract: An image display device which is compact on the whole and low in cost, and which uses a plurality of projection lens systems each of which is constituted by five lens groups including a first aspherical lens group, a second aspherical lens group, a third biconvex lens group, a fourth aspherical lens group and a fifth aspherical lens group which are arranged in this order successively from a screen side, the third lens group having refractive power of not lower than 70% of the total power of the projection lens system, the respective peripheral shapes of the first and second aspherical lens groups being set to have a predetermined relation, a low-dispersion high-index glass material being used for a convex lens of a green projection lens system, a high-dispersion high-index glass material being used for convex lenses of blue and red projection lens systems.

Abstract: A non-volatile semiconductor memory with an electrically erasable and programmable read only memory showing a high speed batch erasure operation is provided wherein applications of erasure pulse signals onto the memory cells are continued until the number of times of the erasure pulse signal applications made corresponds to a predetermined number already set before commencement of the erasure pulse signal applications, the predetermined number being set to correspond to an estimated number of times of the erasure pulse signal applications necessary for completing the batch erasure operation for subsequently repeating a set of an additional erasure pulse signal application onto the memory cells and a verifying process for verifying erasure states of all the memory cells until there is verified the fact that all the memory cells have been in erasure states.

Abstract: The equalizing mechanism includes: timing belts laid in parallel to the rails for moving on a base; timing pulleys engaged with the timing belts; timing pulleys for interlocking mounted on shafts of the timing pulleys; and a timing belt for interlocking racked between the timing pulleys for interlocking whereby, when the movable beam on the rails for moving is driven, a driving force given by the rotation between the timing belt and the timing pulley on one side is equalized to be transmitted to the timing belt and the timing pulley on the other side through the timing pulley for interlocking, the timing belt for interlocking and the timing pulley for interlocking.