Abstract: A spectrometer includes a support having a bottom wall part and a side wall part surrounding a spectroscopic space, a cover arranged on an opening part formed by the side wall part and provided with a light transmitting part, a joining member arranged between the cover and the opening part, a light detection element supported by the side wall part between the spectroscopic space and the cover, and an optical function part provided on a surface of the bottom wall part. A vent is provided in at least one of the support, the cover, and the joining member. The vent is open to an outside and a space defined by the support, the cover, and the light detection element. The space communicates with the spectroscopic space.

Abstract: A PWM signal generator of a motor controller 100-1 divides, upon occurrence of a condition in which one among a count incrementing period and a count decrementing period for a carrier is greater than or equal to a threshold, in conjunction with a condition in which the other among the count incrementing period and the count decrementing period is less than the threshold, an on time period of any one among a first PWM signal, a second PWM signal, and the third PWM signal into given on time periods and to add a given divided on time period to an energizing time period that is less than the threshold.

Abstract: The present application provides a motor control device capable of suppressing noise. A motor control device includes a control unit configured to generate a PWM signal corresponding to each phase (U, V, W) of a motor, an inverter circuit configured to drive the motor, based on the PWM signal, and a current detector connected to a direct-current line of the inverter circuit in series. The control unit includes a current detection unit, a duty cycle setting unit configured to set a duty cycle, based on a detection result of the current detection unit, and a PWM signal generation unit configured to generate the PWM signal. The PWM signal of each phase has a signal level changing at a timing according to the set duty cycle in a first period in one cycle of the PWM signal and has a signal level changing at a different fixed timing in the second period in one cycle of the PWM signal. The current detection unit detects a current (Sd) of the current detector in the second period.

Abstract: A motor controller 100-1 includes an inverter, a current detection unit, a current detector, and a PWM signal generator.

Abstract: The present application provides a motor control device capable of suppressing noise. A motor control device includes a control unit configured to generate a PWM signal corresponding to each phase (U, V, W) of a motor, an inverter circuit configured to drive the motor, based on the PWM signal, and a current detector connected to a direct-current line of the inverter circuit in series. The control unit includes a current detection unit, a duty cycle setting unit configured to set a duty cycle, based on a detection result of the current detection unit, and a PWM signal generation unit configured to generate the PWM signal. The PWM signal of each phase has a signal level changing at a timing according to the set duty cycle in a first period in one cycle of the PWM signal and has a signal level changing at a different fixed timing in the second period in one cycle of the PWM signal. The current detection unit detects a current (Sd) of the current detector in the second period.

Abstract: A motor controller 100-1 includes an inverter, a current detection unit, a current detector, and a PWM signal generator.

Abstract: A PWM signal generator of a motor controller 100-1 divides, upon occurrence of a condition in which one among a count incrementing period and a count decrementing period for a carrier is greater than or equal to a threshold, in conjunction with a condition in which the other among the count incrementing period and the count decrementing period is less than the threshold, an on time period of any one among a first PWM signal, a second PWM signal, and the third PWM signal into given on time periods and to add a given divided on time period to an energizing time period that is less than the threshold.

Abstract: A spectrometer includes a support having a bottom wall part and a side wall part surrounding a spectroscopic space, a cover arranged on an opening part formed by the side wall part and provided with a light transmitting part, a joining member arranged between the cover and the opening part, a light detection element supported by the side wall part between the spectroscopic space and the cover, and an optical function part provided on a surface of the bottom wall part. A vent is provided in at least one of the support, the cover, and the joining member. The vent is open to an outside and a space defined by the support, the cover, and the light detection element. The space communicates with the spectroscopic space.

Abstract: A dielectric ceramic composition is provided which exhibits a high unloaded quality factor (Qu) and permits regulation of the relative dielectric constant (?r) and the temperature coefficient (?f) of resonance frequency (fo) within specific ranges in accordance with use or application of the composition. A dielectric resonator is also provided which includes a resonator main body formed from the composition. The dielectric ceramic composition contains, as metallic components, Ba, Zn, Nb, Ta, and Sb, and the amounts of the metallic components, as reduced to their oxides, satisfy the following relations expressed in mol %: 57.5?BaO?62.6; 16.0?ZnO?22.2; 0<Nb2O5?20.6; 0<Ta2O5?20.6; and 0<Sb2O3?5.9.

Abstract: A dielectric ceramic material is represented by the following compositional formula, (100-a)[Bau{(ZnvCo1-v)wNbx}O?1]-a[MyTazO?2], where M represents at least one species selected from K, Na, and Li. In one method, the dielectric material is produced by mixing raw material powders such that proportions by mol of component metals simultaneously satisfy the relations, 0.5?a?25; 0.98?u?1.03; 0?v?1; 0.274?w?0.374; 0.646?x?0.696; 0.5?y?2.5; and 0.8?z?1.2. The method further includes subjecting the resultant mixture to primary pulverization; calcining the resultant powder at 1,100-1,300° C., followed by wet secondary pulverization; drying the resultant paste; granulating; molding the resultant granules to thereby yield a compact; and firing the compact in air advantageously at 1,400-1,600° C.

Abstract: A dielectric composition is based on a BaO—MgO—Nb2O5 system material (BMN system material) having a dielectric constant, &egr;, of about 30, a large Q-value (no-load quality coefficient) and a comparatively small absolute value of the temperature coefficient (&tgr;f) of its resonance frequency but containing no expensive Ta. The dielectric material has a composite perovskite crystal structure as the main crystal phase, wherein a predetermined amount of KNbO3 is added to a BMN system material. The high frequency characteristics can be further improved by partially replacing Nb with Sb and partially replacing the B site of the perovskite crystal structure with Sn.

Abstract: A dielectric ceramic composition is provided which exhibits a high unloaded quality factor (Qu) and permits regulation of the relative dielectric constant (&egr;r) and the temperature coefficient (&tgr;f) of resonance frequency (fo) within specific ranges in accordance with use or application of the composition. A dielectric resonator is also provided which includes a resonator main body formed from the composition. The dielectric ceramic composition contains, as metallic components, Ba, Zn, Nb, Ta, and Sb, and the amounts of the metallic components, as reduced to their oxides, satisfy the following relations expressed in mol %: 57.5≦BaO≦62.6; 16.0≦ZnO≦22.2; 0<Nb2O5≦20.6; 0<Ta2O5≦20.6; and 0<Sb2O3≦5.9.

Abstract: A dielectric composition is based on a BaO—MgO—Nb2O5 system material (BMN system material) having a dielectric constant, &egr;, of about 30, a large Q-value (no-load quality coefficient) and a comparatively small absolute value of the temperature coefficient (&tgr;f) of its resonance frequency but containing no expensive Ta. The dielectric material has a composite perovskite crystal structure as the main crystal phase, wherein a predetermined amount of KNbO3 is added to a BMN system material. The high frequency characteristics can be further improved by partially replacing Nb with Sb and partially replacing the B site of the perovskite crystal structure with Sn.

Abstract: A dielectric ceramic material is represented by the following compositional formula, (100-a)[Bau{(ZnvCo1-v)wNbx}O&dgr;1]-a[MyTa2O&dgr;2], where M represents at least one species selected from K, Na, and Li. In one method, the dielectric material is produced by mixing raw material powders such that proportions by mol of component metals simultaneously satisfy the relations, 0.5≦a≦25; 0.98≦u 23 1.03; 0≦v≦1; 0.274 ≦w≦0.374; 0.646≦x ≦0.696; 0.5≦y≦2.5; and 0.8≦z≦1.2. The method further includes subjecting the resultant mixture to primary pulverization; calcining the resultant powder at 1,100-1,300° C., followed by wet secondary pulverization; drying the resultant paste; granulating; molding the resultant granules to thereby yield a compact; and firing the compact in air advantageously at 1,400-1,600° C.

Abstract: The present invention is directed to a dielectric ceramic composition exhibiting a high unloaded quality factor and a small variation thereof. The dielectric ceramic composition of the invention containing Ba, Zn, and Ta, contains 100 parts by weight of a predominant component represented by xBaO—yZnO—(½)zTa2O5 (x, y, and z represent compositional proportions by mol and satisfy x+y+z=1), wherein x, y, and z fall within a quadrilateral region formed by connecting points A (x=0.503, y=0.152, z=0.345), B (x=0.497, y=0.158, z=0.345), C (x=0.503, y=0.162, z=0.335), and D (x=0.497, y=0.168, z=0.335) (sides AB, BD, DC, and CA being included) as shown in FIG. 1; 0.2-1.6 parts by weight K as reduced to K2O; and 0.7-8 parts by weight Ta as reduced to Ta2O5, wherein the ratio by weight of K to Ta falls within the range of 0.185-0.4.

Abstract: The present invention is directed to a dielectric ceramic composition exhibiting a high unloaded quality factor and a small variation thereof. The dielectric ceramic composition of the invention containing Ba, Zn, and Ta, contains 100 parts by weight of a predominant component represented by xBaO-yZnO-(½)zTa2O5 (x, y, and z represent compositional proportions by mol and satisfy x+y+z=1), wherein x, y, and z fall within a quadrilateral region formed by connecting points A (x=0.503, y=0.152, z=0.345), B (x=0.497, y=0.158, z=0.345), C (x=0.503, y=0.162, z=0.335), and D (x=0.497, y=0.168, z=0.335) (sides AB, BD, DC, and CA being included) as shown in FIG. 1; 0.2-1.6 parts by weight K as reduced to K2O; and 0.7-8 parts by weight Ta as reduced to Ta2O5, wherein the ratio by weight of K to Ta falls within the range of 0.185-0.4.

Abstract: This invention has as its object to provide an ink-jet head assembling apparatus, which can improve productivity by omitting the step of temporarily fixing a top plate and a heater board using an ultraviolet curing adhesive.In order to achieve this object, an ink-jet head assembling apparatus of this invention includes a plurality of work stations, an index table, upper and front pressing members, arranged at a position on the index table corresponding to at least one of the plurality of work stations, for holding the top plate on the heater board, and first and second driving mechanisms, arranged outside the index table, for switching the holding member between a holding state wherein the top plate member is held on the heater board, and a non-holding state attained by releasing the holding state.