Abstract: A method for producing a polymerized hydrocarbon includes a step of a dehalogenation of a halogenated hydrocarbon with a magnesium-diene complex. Low-molecular-weight compounds, such as dimers or trimers of hydrocarbon units, oligomers of hydrocarbon units, or polymers of hydrocarbon units can be produced by this method while generating significantly less odor.

Abstract: A calibration jig for a component recognition device and a component recognition calibration method using the jig which can stabilize the mounting accuracy of a component to a to-be-mounted object and improve amount quality. An opening is formed at a to-be-picked up face of the calibration jig. A predetermined position of the calibration jig is recognized on the basis of the contrast between the picked-up face and the opening. The position of the calibration jig can be recognized with higher accuracy, so that a resolution of the component recognition device, etc. can be obtained with a higher degree of accuracy. Mount accuracy of the component to the object is thus stabilized and mount quality is improved.

Abstract: A method for preparing bromofluorenes includes a step of dispersing a compound selected from the group consisting of fluorene, fluorenone, and derivatives of fluorene and fluorenone in water to prepare a disperse system. Bromination is initiated by adding bromine Br2 into the disperse system. Thus, bromofluorenes can be efficiently and economically prepared without using any environmentally harmful organic solvent requiring a high cost to dispose of.

Abstract: A crystallized glass is provided. A &bgr;-quartz solid solution or a &bgr;-eucryptite solid solution is precipitated as a main crystal. The crystallized glass has a crystallization degree not less than 70 mass %, a crystal grain size not more than 0.5 &mgr;m, substantially no gap or crack occurring at boundaries of crystal grains. The crystallized glass also has a thermal expansion coefficient being negatively greater than −10×10−7/° C. within a temperature range of −40° C.˜100° C., a hysteresis of the thermal expansion coefficient within the temperature range being not more than 10 ppm, and a temperature dependence of the refractive index being not more than 13×10−6/° C.

Abstract: The present invention includes a component placement apparatus that can obtain information on the presence/absence of hold members inexpensively and easily, and a component placement method carried out by the component placement apparatus. A replacement hold member detector for detecting the presence/absence of replacement hold members at a hold member change part is installed at a placement head. The presence/absence is detected by moving an XY-robot so as to scan the hold member change part equipped with the replacement hold member detector. At the same time, type information attached to the replacement hold members is rendered readable by the replacement hold member detector. One replacement hold member detector is enough according to the apparatus and method of the present invention. The presence/absence information of the hold members can be obtained inexpensively and easily.

Abstract: A process is provided for the production of 2,7-dibromofluorenone. According to the process, a 2,7-dibromofluorene-contianing raw material is oxidized with molecular oxygen in the presence of a phase transfer catalyst such as a quaternary ammonium salt in a heterogeneous, mixed solvent of an aqueous solution of a caustic alkali and a water-insoluble organic solvent. Crude crystals of 2,7-dibromofluorenone, which have been obtained by the oxidization, can be purified by recrystallization to recover 2,7-dibromofluorenone as crystals having a purity of at least 99 wt. %.

Abstract: A component installing device comprises: a tray component supply section (8) having a plurality of conjointly provided tray component supply mechanisms (7) for moving selected trays (4) from a storage position (5) to a component supply position (6), according to need, thereby providing the components (2) accommodated therein for use; and a cassette component supply section (13) having a plurality of mutually aligned component supply cassettes (12) for carrying components in a tape cassette or a bulk cassette, and transporting said components to a component supply position (11), one at a time, thereby providing said components for use.

Abstract: A method of preventing a nozzle or nozzles from dropping in a component mounting apparatus include gripping the nozzle structures with pivotal levers that are biased to a closed position. The pivotal levers are released after activation of the nozzles to permit appropriate movement for picking up, inspecting, orientating and locating electronic components on a substrate with the nozzles. During the operation of the mounting head, the levers are maintained in a release position against a biasing force and at the end of the operation, the biasing force can then cause the levers to close and support the nozzles in a gripping manner.

Abstract: A method for preparing bromofluorenes includes a step of dispersing a compound selected from the group consisting of fluorene, fluorenone, and derivatives of fluorene and fluorenone in water to prepare a disperse system. Bromination is initiated by adding bromine Br2 into the disperse system. Thus, bromofluorenes can be efficiently and economically prepared without using any environmentally harmful organic solvent requiring a high cost to dispose of.

Abstract: A crystallized glass is provided. A &bgr;-quartz solid solution or a &bgr;-eucryptite solid solution is precipitated as a main crystal. The crystallized glass has a crystallization degree not less than 70 mass %, a crystal grain size not more than 0.5 &mgr;m, substantially no gap or crack occurring at boundaries of crystal grains. The crystallized glass also has a thermal expansion coefficient being negatively greater than −10×10−7/° C. within a temperature range of −40° C.˜100° C., a hysteresis of the thermal expansion coefficient within the temperature range being not more than 10 ppm, and a temperature dependence of the refractive index being not more than 13×10−6/° C.

Abstract: A substance 6 is located in a gradient magnetic field and held in a levitating state by a magnetic force produced by the gradient magnetic field. The substance 6 as such in the levitating state is heated and melted by ray or heat irradiation or by a resistance heater. Thereafter, the heating is stopped, and the substance 6 is cooled as such in the levitating state. Since the magnetic force realizes the microgravity field where the substance 6 is melted and cooled in the levitating state, the substance 6 is formed to an ideally spherical shape with an extremely smooth surface.

Abstract: According to the present invention, a control device and a circuit board moving device controlled in operation by the control device for holding a circuit board are provided, whereby the circuit board moving device is moved to bring a component mount position on the circuit board closest to a recognition device after the circuit board moving device is moved to bring the component mount position closest to a component feed position. In the state, a circuit board mark formed on the circuit board is detected, thereby recognizing a position of the circuit board. A transfer distance for the component by a component hold device from the recognition device to the component mount position is thus shortened, enabling high-speed mounting with higher accuracy.

Abstract: According to the present invention, a control device and a circuit board moving device controlled in operation by the control device for holding a circuit board are provided, whereby the circuit board moving device is moved to bring a component mount position on the circuit board closest to a recognition device after the circuit board moving device is moved to bring the component mount position closest to a component feed position. In the state, a circuit board mark formed on the circuit board is detected, thereby recognizing a position of the circuit board. A transfer distance for the component by a component hold device from the recognition device to the component mount position is thus shortened, enabling high-speed mounting with higher accuracy.

Abstract: An electronic component mounting apparatus which employs a first air feed device connected to an air passage at one end part of a spline shaft, and a second air feed device connected to the air passage in the vicinity of the other end of the spline shaft. The first and second air feeds function to supply air to the air passage to return an interior thereof to atmospheric pressure. The time required to return the vacuum pressure in the air passage to atmospheric pressure can be shortened by the use of the two separate air feeds.

Abstract: An electronic component mounting method which employs a first air feed device connected to an air passage at one end part of a spline shaft, and a second air feed device connected to the air passage in the vicinity of the other end of the spline shaft. The first and second air feeds function to supply air to the air passage to return an interior thereof to atmospheric pressure. The time required to return the vacuum pressure in the air passage to atmospheric pressure can be shortened by the use of the two separate air feeds.

Abstract: Method and apparatus for mounting electronic components in which components are efficiently fed and transferred for enhancing productivity is provided. Tray draw-out device (6) is disposed at a component feeding unit (4) for pulling out a tray (3) accommodating electronic components (2) from the component feeding unit (4) to a given pick-up position, where the electronic components (2) are transferred by the transfer mechanism (11) on to a temporary holder (8) disposed on a draw-out arm (7) of the tray draw-out device (6). Mounting head (5) has a plurality of mounting nozzles (5a), with which the mounting head (5) picks up several electronic components (2) aligned on the temporary holder (8) at a time and mount them on to a circuit board (1) which has been loaded and located at a prescribed position.

Abstract: A mounting head is provided with a pair of first levers which are pivotally connected so that the first levers can swing in an open and close direction and forced in the close direction by a compression spring so as to grip a shaft, a release pin for opening the first levers by engaging release grooves at an open/close end of the first levers, a second lever for driving the release pin toward the open/close end of the first levers by a driving means, and a spring for forcing the second lever in a direction opposite to the driving direction of the release pin. During an operation of the mounting head, the first levers are opened by driving the release pin with the second lever, only after the shaft is activated, and at the end of the operation releasing the drive of the release pin by the second lever, allowing the first levers to close and support the shaft in a gripping manner.

Abstract: A transmission mechanism includes a pressing stroke controller for changing the effective pressing stroke of each feed lever of a component feeder unit corresponding to a predetermined pitch of carrying electronic components in respective component feeder unit, whereby the vibration generated when the transmission mechanism is in operation is reduced. Adverse effects on a component feeder unit having small components thereon at a fine pitch which is susceptible to the vibration will be prevented, and the feeding speed can be increased to be more productive.