Abstract: An optical pick-up device for use in an optical disc information recording/reproducing apparatus is provided. In the present optical pick-up device, the functions of two or more separate optical elements provided in the prior art structure are combined or integrated in a single element to reduce the total number of separate optical elements provided in the device. In particular, use is made of a diffraction grating rather than lenses and/or lenses are formed as holo lenses. A diffraction grating and a holo lens may be formed substantially in the shape of flat plates, so that many optical components can be put together to define an integrated subassembly, which reduces the total number of discrete elements, facilitates manufacturing and eliminates the necessity of adjustments among optical elements once set.

Abstract: An optical pick-up device for use in an optical disc information recording/reproducing apparatus is provided. In the present optical pick-up device, the functions of two or more separate optical elements provided in the prior art structure are combined or integrated in a single element to reduce the total number of separate optical elements provided in the device. In particular, use is made of a diffraction grating rather than lenses and/or lenses are formed as holo lenses. A diffraction grating and a holo lens may be formed substantially in the shape of flat plates, so that many optical components can be put together to define an integrated subassembly, which reduces the total number of discrete elements, facilitates manufacturing and eliminates the necessity of adjustments among optical elements once set.

Abstract: An information reading device which comprises a semiconductor laser source which emits a semiconductor laser beam and a first condenser lens for converging the laser beam to form an irradiation beam. A beam shaping optical system is disposed on the optical path of the laser beam to form a predetermined beam section shape of the irradiation beam which is converged by the first condenser lens. A hologram disk is used for deflecting the irradiation beam. The information reading device further comprises an optical path separation system. The optical path of the irradiation beam is separated from that of the reflection beam reflected from the scanning surface irradiated by the irradiation beam. A second condenser lens is arranged from converging the reflection beam separated from the irradiation beam by the optical path separation means. And an optical sensor is arranged for detecting the reflection beam converged by the second condenser lens.

Abstract: An optical pick-up device for use in an optical disc information recording/reproducing apparatus is provided. In the present optical pick-up device, the functions of two or more separate optical elements provided in the prior art structure are combined or integrated in a single element to reduce the total number of separate optical elements provided in the device. In particular, use is made of a diffraction grating rather than lenses and/or lenses are formed as holo lenses. A diffraction grating and a holo lens may be formed substantially in the shape of flat plates, to define an optical components can be put together to define an integrated subassembly, which reduces the total number of discrete elements, facilitates manufacturing and eliminates the necessity of adjustments among optical elements once set.

Abstract: An optical head device for recording and reproducing information includes beam splitting and converging mechanisms which has a first portion and a second portion secured to the first portion and is disposed on an optical path of light reflected from a photo-magnetic disk.The first portion is adapted to split the reflected light received by the beam splitting and converging means into two beams which propagate in at least two directions different from each other and adapted to proportion the amount of reflected light in each of the two beams by means of the magnitude of the p-polarized component contained in the reflected light.The second portion is adapted to converge separately the two split beams.The converged two beams are used for reproducing binary data in the photo-magnetic disk.

Abstract: A liquid supply apparatus comprising a mixing tank provided with a stirring means for stirring a liquid mixture, an electrode for measuring the hydrogen ion concentration of the liquid mixture, a plurality of supply liquid tanks for storing different supply liquids, a liquid supply section for supplying the supply liquids to the mixing tank, a supply control section for controlling the amounts of the supply liquids to be supplied at the liquid supply section based on a difference between a preliminary memorized initially the value and a measured value signaled from the electrode and on the amounts of the supply liquids supplied to the mixing tank, conduits connecting the supply liquid tanks and the liquid supply section and a conduit connecting the liquid supply section and the mixing tank.

Abstract: A method of recording a hologram on a recording medium composed of a substrate and a recording material coated as a thin layer on the substrate, the recording medium being transparent or semitransparent with respect to light to which the recording medium is exposed. A value B, B/A, B/Bo, A/B, or Bo/B is established where A is the intensity of the light at a surface of the recording medium, B is the intensity of the light that has passed through the recording medium, and Bo is the intensity of the light that has passed through the recording medium immediately after the recording medium has started to be exposed to the light. The recording medium is exposed to the light until the established value is equalized to a preset value. The exposure of the recording medium is stopped when the established value is equalized to the preset value.

Abstract: A liquid injection device, comprising:a pair of a rotor and a stator relatively rotatable in a face-contacting relationship under a liquid-tight state;a plurality of small openings penetrating through the rotor or stator and communicating to a plurality of liquid systems; anda plurality of bridging grooves or openings provided on the contacting surface of the rotor or stator to communicate two or more of the small openings so as to form a liquid flowing path. The rotor can be rotated to a predetermined angle in a normal or reverse direction with respect to the stator so as to communicate a desired number of small openings or cut off the communication between a desired number of small openings by the relative shift of the bridging grooves with respect to the small openings.

Abstract: The present invention relates to a chromatographic apparatus for analyzing a sample of an aqueous solution containing a plurality of micro-concentration components. In the apparatus an aqueous solution sample and an eluting solution are introduced into a separating column having a length of 20 to 90 mm, which is filled with a predetermined separating carrier and placed in a thermostatic oven which also contains a detecting cell connected to the separating column, by means of a constant flow, pulse free feeding pump.

Abstract: A liquid chromatographic flow cell for measuring constituents of a specimen solution, comprising at least two electrodes, each having a first through hole, an insulating member having a second through hole and so disposed as to electrically insulate the electrodes from each other, a first and a second supporting members for clamping therebetween the electrodes and the insulating member in such a way that the first and the second through holes are coaxially aligned so as to define a first passage of the specimen solution and having, respectively, a second passage and a third passage of the specimen solution which communicate with the first passage, a first light guiding member for guiding a light for measuring an absorbance of the specimen solution into the second passage defined in the first supporting member, and a second light guiding member for guiding the light transmitted through the third passage defined in the second supporting member to means for measuring an absorbance of the specimen solution.

Abstract: A laser light beam is projected through a fluid measuring cell having a fluid accommodating chamber and inlet and outlet pathways for the fluid. The light is separated into transmitted light and scattered light. Separate light detectors sense the transmitted light and scattered light. An electric control circuit uses the variations of the intensity of the transmitted light to compensate for fluctuations in the intensity of the scattered light to provide an output related to the intensity of the scattered light.

Abstract: An apparatus for painting the outer circumferential surfaces of a plurality of cylindrical containers. The apparatus comprises a rotatable disc having a surface positioned in a vertical plane and a plurality of mandrels secured to the surface of the disc and projecting horizontally therefrom for supporting the containers. A rotatable painting roll is positioned adjacent the disc for applying paint to the containers. First and second rotatable paint storage rolls are provided, the second paint storage roll being above said painting roll and interposed between the painting roll and the first paint storage roll. The axes of the two paint storage rolls are parallel and in a horizontal plane, and the axes of the painting roll and the second storage roll are parallel and define a plane which is angularly displaced with respect to the horizontal and vertical planes.

Abstract: A gel permeation chromatograph system comprises a series of a solvent tank, a line filter and a distribution block; a pair of series of constant flow feeding pumps and sample injecting devices which are connected to the distribution block under dividing into a sample side passage and a reference side passage; a pair of analysis columns in each passage; and a detector connected to the outlet side passages of said analysis columns.

Abstract: A stereo-viewer and a stereo-sheet for use therewith, includes a set of oculars disposed in a horizontal plane in a case and separated from each other by the distance between the eyes of the user. The case has an insertion slot for accommodating the stereo-sheet which passes in the vertical direction through the case. A frame feeding device is connected to the case for moving the stereo-sheet in the vertical direction. No elements are required to change the direction of the path of the light in a vertical direction.

Abstract: A refractometric densitometer includes a first packing element and a first gasket disposed at one side of a glass element and a second packing element and a second gasket disposed at the other side of the glass element. A groove for passage of a reference material and a groove for passage of a sample are respectively formed in the first and second packing elements. An inlet pipe and an outlet pipe are formed in the first and second gaskets for passing the reference material or the sample to the grooves. The outlet pipe of the first gasket is connected to the inlet pipe of the second gasket. Multiple reflection is imparted to an incident light from the part of the glass element between the faced surfaces of the glass element contacting the first and second packing elements.