Abstract: The high pressure discharge lamp ballast drives a high pressure discharge lamp with a synthesized-waveform alternating current made of multiple frequency components, the high pressure discharge lamp having a pair of electrodes disposed to face each other. The ballast controls a ratio of the multiple frequency components per unit time; applies a synthesized-waveform current in accordance with the ratio to the high pressure discharge lamp; and detects a lamp parameter of the high pressure discharge lamp. The control circuit is configured to shift the ratio to a first ratio when the lamp parameter is in a first state, and shifts the ratio to a second ratio when the lamp parameter is in a second state. The control circuit changes the ratio stepwise when the ratio is shifted from the first ratio to the second ratio, or when the ratio is shifted from the second ratio to the first ratio.

Abstract: A high pressure discharge lamp ballast performs driving with a synthesized current waveform comprising a combination of first and second sets of current waveforms. The ballast controls content rates of each of the sets per unit time; detects a rotation synchronization signal for a color wheel; applies a synthesized current waveform in accordance with the synchronization signal and the content rates to a high pressure discharge lamp; and detects a lamp voltage. A period of each of the first and second sets equals to one rotation of the color wheel. The number of inversions of the second set is larger than that of the first set. The content rate of the second set is set to RL% when the lamp voltage exceeds a value V, and the content rate of the second set is set to RH% when lamp voltage falls below a value V?.

Abstract: Provided is an electrode for a high pressure discharge lamp, which prevents spring-back of an electrode coil, and which has high productivity and high accuracy in positioning the coil. The electrode for the high pressure discharge lamp includes: an electrode core bar (30); and a coil (35) mounted on the electrode core bar, and is configured as follows. The electrode core bar (30) includes: a small-diameter section (31) on a power supply side; and a large-diameter section (32) on a leading end side. The large-diameter section (32) has: a large-diameter portion (32a) on the small-diameter section side; a small-diameter portion (32b) having a smaller outer diameter than the large-diameter portion, the small-diameter portion forming a step (s) with the large-diameter portion therebetween; and a leading end portion (32c). The coil (35) covers a portion between the step (s) and the leading end portion.

Abstract: Provided is an electrode for a high pressure discharge lamp, which prevents spring-back of an electrode coil, and which has high productivity and high accuracy in positioning the coil. The electrode for the high pressure discharge lamp includes: an electrode core bar (30); and a coil (35) mounted on the electrode core bar, and is configured as follows. The electrode core bar (30) includes: a small-diameter section (31) on a power supply side; and a large-diameter section (32) on a leading end side. The large-diameter section (32) has: a large-diameter portion (32a) on the small-diameter section side; a small-diameter portion (32b) having a smaller outer diameter than the large-diameter portion, the small-diameter portion forming a step (s) with the large-diameter portion therebetween; and a leading end portion (32c). The coil (35) covers a portion between the step (s) and the leading end portion.

Abstract: In a frequency control for a high pressure discharge lamp ballast, short-term increase and decrease of a lamp voltage are suppressed. The high pressure discharge lamp ballast drives a high pressure discharge lamp with a synthesized-waveform alternating current made of multiple frequency components, the high pressure discharge lamp having a pair of electrodes disposed to face each other. The ballast includes: a control means for controlling a component contained ratio of the multiple frequency components per unit time; an output means for applying a synthesized-waveform current in accordance with the component contained ratio to the high pressure discharge lamp; and detection means for detecting a lamp parameter of the high pressure discharge lamp.

Abstract: Even when usable driving frequencies are limited, a lamp voltage is appropriately controlled. A high pressure discharge lamp ballast performs driving with a synthesized current waveform comprising a combination of first and second sets of current waveforms. The ballast includes: a control means for controlling content rates of each of the sets per unit time; a detection means for detecting a rotation synchronization signal for a color wheel; an output means for applying a synthesized current waveform in accordance with the synchronization signal and the content rates to a high pressure discharge lamp; and a detection means for detecting a lamp voltage. The sets are each in a waveform inverted so as to correspond to at least one of a rotational speed and segment positions of color wheel. A period of each of the first and second sets has a length equivalent to one rotation of the color wheel. The number of inversions of the second set is larger than the number of inversions of the first set.

Abstract: The invention uses: a clock signal generator for generating a clock signal asynchronized with an input signal; a frequency dividing unit for frequency dividing the clock signal outputted from the clock signal generator and outputting a predetermined clock enable signal; a digital interface processor for separating and outputting a compressed video image, audio information, and the like from a compressed digital signal in response to the clock enable signal outputted from the frequency dividing unit; a video processing unit for decoding the compressed video information outputted from the digital interface processor, obtaining a video signal, and synchronizing it with the input signal; and an audio processing unit for decoding the audio information outputted from the digital interface processor, obtaining a audio signal, and outputting the audio signal at synchronous timing according to an audio operating mode.

Abstract: In a machine tool for performing cutting work of a work employing a tool provided with at least one throw away tip, abnormality of the tip C can be certainly detected by picking up tips C1, C2, . . . Cn of the tool by means of image pick-up means 23, providing different image processes for the obtained image, obtaining a luminance value distribution data of an inspecting region set at a cutting edge portion of the tip, and performing interpolation processing between the images for the obtained luminance value distribution data to take out only a luminance value of a defective portion Cc of the inspecting region and to detect abnormality of the tip C1, C2, . . . Cn on the basis of the luminance value. Thus, abnormality of the tip C can be certainly detected even when a stain is deposited.

Abstract: A turn broach abnormality sensing apparatus is provided for use in a turn broach for cutting a rotating workpiece (3) by rotating a broach cutter (18) that comprises a plurality of unitary cutters (18b) axially coupled together, each having a plurality of tip rows (181, 182, . . . 18n) arranged on, a peripheral surface thereof in the form of a helicoid. The abnormality sensing apparatus includes a plurality of image pickup means (23) disposed corresponding respectively to the unitary cutters (181, 182, . . .

Abstract: A die height correcting apparatus for a press having sides formed by C-shaped frames and a slide to be driven up and down being provided on an upper portion of a press body, includes an auxiliary frame provided on the side surface of at least one of the C-shaped frame. The lower end side of the auxiliary frame is pivotably mounted on the C-shaped frame and has a free end at the upper end side, a slide position detector provided on the upper end side of the auxiliary frame, and a temperature detector provided at least on the upper end side of the auxiliary frame among the upper end side of the auxiliary frame and the slide position detector. The slide is NC controlled on the basis of a slide position detected by the slide position detector, the temperature detector detects a temperature of the upper end side of the auxiliary frame among the upper end side of the auxiliary frame and the slide position detector.

Abstract: A metal sheet bending machine for bending a metal sheet inserted between an upper bender and lower bender to a desired angle. While the metal sheet is being bent to the desired angle, a linear image of projected measuring light, which rotates with a change in the bending angle of the metal sheet, is formed by a measuring light source on an outer face of the bent metal sheet and sequentially photographed and stored. Based on the stored images, the bending angle of the metal sheet is calculated. Based on the result of the calculation, the positions of tile upper and/or lower benders are controlled whereby the metal sheet can be bent to the desired angle.

Abstract: A metal sheet bending machine for bending a metal sheet inserted between an upper bender and lower bender to a desired angle. While the metal sheet is being bent to the desired angle, a linear image of projected measuring light, which rotates with a change in time bending angle of the metal sheet, is formed by a measuring light source on an outer face of the bent metal sheet and sequentially photographed and stored. Based on the stored images, the bending angle of the metal sheet is calculated. Based on the result of the calculation, the positions of the upper and/or lower benders are controlled whereby the metal sheet can be bent to the desired angle.