Abstract: A sintered alumina-based ceramic has a relative density of equal to or higher than 95%, an average grain size in a range of 10-25 .mu.m and a fracture toughness Kc equal to or lower than 3.0 MPam.sup.1/2 Furthermore. In a machinability evaluation test using a surface grinder, the ceramic exhibits equal to or less than 310 W of increase in the load on a motor rotating a grinding wheel of the surface grinder. The machinability evaluation test is performed under the following condition.(1) The dimension of a test piece of the sintered alumina-based ceramic is larger than 15 mm in width, larger than 30 mm in length and larger than 10 mm in height.(2) The test piece is fixed on a table of said surface grinder and ground by the grinding wheel along a direction of its length.(3) The grinding wheel has a dimension of 10 mm in width and 200 mm in outer diameter, and consists of synthetic (or artificial) diamond abrasive grains more than 80 wt % of which are in a grain size range of 74-88 .mu.

Abstract: The present invention relates to an alloy film resistor containing mainly nickel and phosphorus having an excellent fuse function and a method for producing the alloy film resistor. After the conductivity is given to the surface of an electrical insulating substrate such as ceramics by sequentially performing an etching treatment, an activating treatment and an electroless plating treatment to the electrical insulating substrate, an alloy film containing mainly nickel and phosphorus is formed by not an electroless plating process but an electrolytic plating process. By adopting the electrolytic plating process, a film thickness of the formed alloy film of the middle part on the surface of the insulating substrate is thinner than that of the alloy film of the corner or ridge parts on the surface of the insulating substrate, and the thin part of the film thickness serves as a suitable fusing start part when applying an overload.

Abstract: Positive first and second lenses each having a convex surface directed onto the object side, a negative third lens having a concave surface directed onto an image side, a negative fourth lens having a concave surface directed onto the object side, and positive fifth and sixth lenses each having a convex surface directed onto the image side are successively disposed from the object side, and predetermined conditional expressions are satisfied, thus yielding an image readout imaging lens suitable for reading out color originals. Successively from the object side, positive first and second lenses L1 and L2 each having a convex surface directed onto the object side, a negative third lens L3 having a concave surface directed onto an image side, a negative fourth lens L4 having a concave surface directed onto the object side, and positive fifth and sixth lenses L5 and L6 each having a convex surface directed onto the image side are disposed, and the following conditional expressions (1) to (6) are satisfied:Nda+0.

Abstract: The present system is an electronic endoscope system capable of immediately deciding a trouble on scope connection and moreover easily obtaining ROM version information from the system. In the case of this system, a scope having a CCD is provided with a microprocessor and a processor unit for processing a signal is provided with a microcomputer and a ROM to communicate intrinsic data between the scope and the processor. In this case, the microcomputer decides imperfect connection of the scope and moreover decides a scope-connection error by detecting a fixed value for detection incorporated into communication data. Moreover, when there is imperfect connection of the scope or a connection error, a character message for prompting connection is displayed on the screen of a monitor. Furthermore, in this case, the version information of the ROM is displayed at the same time.

Abstract: Negative, positive, and positive lens groups are disposed successively from the larger conjugate length side, and focal length adjustment is effected by the convex lens disposed on the smallest conjugate length side of the first lens group, thereby yielding a long back focus and a telecentric characteristic, decreasing distortion and chromatic aberration, and simplifying the focusing structure. Successively from the larger conjugate length side, a first lens group G.sub.1 having a negative refracting power and including a convex lens L.sub.5 disposed on the smallest conjugate length side, a second lens group G.sub.2 having a positive refracting power and causing a luminous flux diverged by the first lens group G.sub.1 to become substantially afocal, and a third lens group G.sub.3 having a positive refracting power are disposed, and the convex lens L.sub.5 disposed on the smallest conjugate length side of the first lens group G.sub.1 is moved on an optical axis so as to effect focus adjustment.

Abstract: Each of first and second lenses, which are in meniscus forms with concave surfaces opposing each other, is made as a plastic lens having at least one aspheric surface, and the whole lens system has a three-sheet lens configuration, thereby achieving a smaller size and a lower cost, while making it easy to restrain focus from fluctuating upon changes in temperature. Disposed successively from the object side are a first lens L.sub.1 in a low-power meniscus form made of a plastic having a convex surface directed onto the object side, whose both surfaces are aspherical; a second lens L.sub.2 in a low-power meniscus form made of a plastic having a concave surface directed onto the object side, whose both surfaces are aspherical; and a third lens L.sub.3 in a meniscus form made of a glass with a positive refracting power having a convex surface directed onto the object side.

Abstract: A signal processor circuit which stabilizes a clamp processing of black levels even in an endoscope system of an all-pixels readout type and prevents image qualities from being degraded at a stage to shift from a still image to a moving image in particular. In this signal processor circuit, video signals of all picture elements obtained with a single exposure are read out of a CCD, odd line data is stored into a first memory, even line data is stored into a second memory, and mixed picture element signals are generated by a mixer circuit, whereafter a predetermined image processing is performed by a first DVP. A clamp circuit and an A/D converter are disposed at stages preceding the first and second memories, a through video signal output from the A/D converter is input into the first DVP by way of a selector circuit on the basis of an optical black pulse and a black level clamp signal generated on the basis of the through video signal is fed back to the clamp circuit.

Abstract: A pyrrolidine derivative or a salt thereof expressed by the following formula 1: ##STR1## wherein R.sub.1 is an alkenyl group; R.sub.2 is a lower alkoxy group or a halogen atom;R.sub.3 is a lower alkyl group;X is a group expressed by --O-- or --S--;Y is carbon or nitrogen atom;m is an integer of 1 to 3; andn is an integer of 0 to 2.The pyrrolidine derivative has an anti-ulcer effect or an antibacterial activity against Helicobacter pyroli, and has also high safety to be available for prevention or cure of ulcers.

Abstract: A hand-held LCD game machine is used as a hand-held LCD fish finder, in addition to its original game functions. Instead of a typical ROM game cassette, another device, which includes a cassette portion, a main body, and a float sensor having an ultrasonic transmitter, is inserted into the LCD game machine, so that the topography of the water bottom and the fish in water are displayed on a LCD panel by means of a program ROM having a memory to display the same based on an echo signal issued and received through the ultrasonic transmitter.

Abstract: Through an imaging lens, respective luminous fluxes from a semiconductor laser array light source comprising a plurality of semiconductor laser devices arranged in a row form images on a photosensitive surface, thereby effecting light dot formation (light scanning) on a surface to be scanned without using mechanical light-scanning means such as polygon mirror. The laser printer apparatus comprises a semiconductor laser array light source (1) composed of a number of semiconductor laser devices (light-emitting devices; 1a) arranged in a row, and an imaging lens (3) for forming images of the luminous fluxes from the respective light-emitting devices (1a) in a row on a photosensitive surface (2). The semiconductor laser array light source (1) comprises not less than 700 pieces of minute semiconductor laser devices (1a) arranged in a row and is adapted to modulate laser beams from the respective devices (1a) independently of each other.

Abstract: A signal adapter including a first circuit board adapted to process wired TV signal and telephone signal from a first coaxial cable; a first casing holding the first circuit board at its one side and having a plurality of connectors at its opposite side adapted to transmit processed signal from the first circuit board to end users; a first cover fastened to the first casing and covered over the first circuit board, having a main signal input port through which wired TV signal and telephone signal are transmitted from a coaxial cable to the first circuit board, and a main signal output port through which wired TV signal and telephone signal are transmitted from the first circuit board to a next signal adapter through a second coaxial cable; a second circuit board adapted to provide the necessary telephone signal working power supply to the first circuit board; a second casing extended from one side of the first casing and adapted to hold the second circuit board on the inside; and a second cover fastened to th

Abstract: It is judged whether or not the pivotal movement of gimbal suspension is in a locked state. When the gimbal suspension is judged to be in the locked state, an actuator is stopped, and an operator is informed of this state, whereby the actuator can be prevented from being damaged, and the operator can rapidly respond to the locked state. An angular velocity value detected by an angular velocity sensor is read out (S6); an angle value detected by a position sensor is read out (S7); the read-out value of detedted angular velocity is subracted from an amplified value of detected angle (S9); the value resulting from the subtraction is integrated with respect to time (S10); and it is judged whether or not the gimbal suspension is in a locked state (S11). If it is consequently judged that the gimbal suspension is in the locked state, the control system is stopped (S12), and an alarm LED is flickered (S13).