Abstract: A flat fluorescent lamp and a display device including the same. The flat fluorescent lamp includes a lamp body that has a plurality of discharge spaces and generates light, electrodes that are formed at the both ends of the lamp body, and a plurality of cold spots that are formed on the rear surface of the lamp body.

Abstract: A field-emission electron source apparatus includes a vacuum container that receives a field-emission electron source array, a target and an auxiliary electrode, and a getter pump that is disposed in the vacuum container and absorbs and removes excess gas. An electron beam emitted from the field-emission electron source array passes through a plurality of through holes formed in the auxiliary electrode and reaches the target. A space containing the field-emission electron source array and a space containing the target and the getter pump are separated substantially by the auxiliary electrode so that gas generated from the target is absorbed by the getter pump without passing through the space containing the field-emission electron source array. This makes it possible to provide a highly-reliable field-emission electron source apparatus in which the influence of gas and ions on the field-emission electron source array is eliminated or reduced.

Abstract: The present invention ensures the hermetic bonding of a support body which is interposed between a face substrate and a back substrate and is formed of a plurality of members thus easily realizing the large-sizing of a screen of a display image and, at the same time, enhancing a hermetic property holding function of the image display device. A support body is interposed between a face substrate and a back substrate while surrounding a display region and hermetically seals both substrates using a sealing material. The support body is formed by hermetically bonding a plurality of support body members each other using a bonding material which has a softening point higher than a softening point of the sealing material.

Abstract: To provide a structure of a light emitting element superior in light emission efficiency to a top surface. A structure where two electrodes are arranged in a surface parallel to a substrate with a light emitting layer interposed therebetween, is provided. An electrode is not disposed below the light emitting layer. Therefore, by providing a reflective film below the light emitting layer, light emission efficiency to a top surface can be improved. For example, a film with a reflective index lower than that of the light emitting layer is provided, and light toward the lower side of the light emitting layer is reflected at an interface of the stack where the refractive index has a gap; accordingly, light emission efficiency to the top surface can be improved. In addition, a metal film with a high reflectance (a reflective metal film with a fixed potential or in a floating state) can be disposed below the light emitting layer.

Abstract: The present invention relates to the use of triazole derivatives selected from the group consisting of triazolopyrimidine derivatives and triazolouracil derivatives in organic light-emitting diodes (OLEDs), an OLED comprising at least one of the organic triazole derivatives mentioned, a light-emitting layer comprising at least one of the triazole derivatives mentioned, an OLED comprising the light-emitting layer of the invention, a device comprising an OLED according to the invention and also specific novel triazole derivatives.

Abstract: An organic electroluminescence display includes a first substrate with a pixel region formed with an organic electroluminescence element including a first electrode, an organic thin film layer and a second electrode and a non-pixel region formed with a metal wiring for transmitting signals from the exterior to the organic electroluminescence element, a second substrate arranged in a upper side of the first substrate, a frit provided between the first and second substrates, and a first and a second protective films provided as a stacking structure between the metal wiring and the frit, wherein the first substrate and the second substrate are attached to each other through the frit. The metal wirings of the non-pixel region have a first protective film made of a silicon compound formed thereon.

Abstract: A flat fluorescent lamp including a first substrate, a second substrate facing the first substrate to provide a discharge region having a plurality of discharge spaces and a non-discharge region encompassing the discharge region. Fluorescent layers are arranged on the first and second substrates, and a sealing member is arranged in the non-discharge region shielded from the discharge spaces, and it couples the first and second substrates together.

Abstract: An organic electroluminescent device having an improved structure includes; a duo-bank defining a unit pixel on a substrate, the duo-bank including a first bank and a second bank which are spaced apart from each other, and an organic luminescent material layer formed by inkjet printing a solution containing an organic luminescent material in the unit pixel and a gap between the first bank and the second bank.

Abstract: A liquid crystal display including a liquid crystal panel and an organic EL device, which functions as a backlight. The organic EL device includes a Peltier element, which functions as a substrate, and an organic EL element formed on the Peltier element. The organic EL element includes an organic EL layer and first and second electrodes, which sandwich the organic EL layer. The first electrode is shared with a metal layer, which is a heat absorbing electrode of the Peltier element. The second electrode is formed from ITO, which transmits visible light. Light emitted from the organic EL element exits from the second electrode. As a result, the organic EL device is thin and has a superior cooling effect.

Abstract: An organic electroluminescent device including a pair of electrodes, and at least two organic emitting layers held between the pair of electrodes, (1) two organic emitting layers being arranged with an electron barrier layer interposed therebetween, (2) the two organic emitting layers both including an electron-transporting emitting material.

Abstract: An organic electro luminescent device including at least a first light reflecting layer (2), a first transparent electrode (3), an organic emitting layer (4), a second transparent electrode (5) and a second light reflecting layer (6) stacked on a substrate (1) in this order; wherein at least one of the first light reflecting layer (2) and the second light reflecting layer (6) is light semi-transmissive. Applied light (A) is reflected between the first and second light reflecting layers (2), (6) and undergoes optical interference effect, and reflected light (B) is emitted outside through the second light reflecting layer (6) which is semi-transmissive. At that time, by adjusting an optical path length between the light reflecting layers (2) and (6), the spectrum of reflected light (B) is allowed to have a sharp peak with a specific value. As a result, the color purity is improved.

Abstract: An active matrix display device has pixels each with a light-sensitive device (84) for optical feedback functions. Each pixel has a light blocking structure (100) formed from the thin film layers of the display substrate in the proximity of the light-sensitive device (84) and substantially at the level of an input surface of the light sensitive device. This structure prevents the passage of light (g) to the light sensitive device from a substantially lateral direction.

Abstract: At least one stacked organic or polymeric light emitting diode (PLEDs) devices to comprise a light source is disclosed. At least one of the PLEDs includes a patterned cathode which has regions which transmit light. The patterned cathodes enable light emission from the PLEDs to combine together. The light source may be top or bottom emitting or both.

Abstract: An organic light emitting display device which can prevent separation of a buffer layer, thereby reducing an electrical short is disclosed. One embodiment of the organic light emitting display device includes a substrate made of a metal, a metal thin film formed on the substrate, a buffer layer formed on the metal thin film, and an organic light emitting diode formed on the buffer layer. Accordingly, a leakage current caused by an electrical short can be effectively prevented by preventing the separation of the buffer layer.

Abstract: In a planar display apparatus having electron-emitter elements, phosphors, and spacers in combination, occurrence of vacuum discharge such as arc discharge or spark discharge is reduced and after images are reduced in the display apparatus by using a thin-film electron emitter, in which an electron-emitter elements are operated before starting-up of image display and a phosphor-application voltage during the operation is set to a non-light emitting voltage.

Abstract: The present invention relates to an organic light emitting device including a substrate, first and second signal lines formed on the substrate, a switching transistor connected to the first and second signal lines and including a first semiconductor, a driving transistor connected to the switching transistor and including a second semiconductor, a first electrode connected to the driving transistor, a second electrode facing the first electrode, and a light emitting member formed between the first electrode and the second electrode. The first semiconductor and the second semiconductor are formed on different layers of the display.

Abstract: An electron beam emitted from a field-emission electron source array passes through a plurality of through holes formed in a trimming electrode and reaches a target. Each of the plurality of through holes in the trimming electrode has an opening on a side of the field-emission electron source array and an electron beam passageway that continues from the opening. The length of the electron beam passageway is larger than the diameter of the opening. Part of the electron beam that has entered the through holes is absorbed and removed by a lateral wall of the electron beam passageway. In this way, it is possible to provide a high-definition field-emission electron source apparatus in which divergence of an electron beam emitted from a field-emission electron source array is suppressed.

Abstract: An electron beam emitted from a field-emission electron source array passes through a plurality of through holes formed in a mesh structure and reaches a target. Each of the plurality of through holes in the mesh structure has an opening on a side of the field-emission electron source array and an electron beam passageway that continues from the opening. The mesh structure is formed of a silicon-containing material doped with a N-type or P-type material. In this way, it is possible to suppress a decrease in the amount of the electron beam reaching the target while securing a mechanical strength of an electrode provided with a large number of through holes, and suppress expansion of the electron beam on the target.

Abstract: The present invention relates to a flexible EL lamp that can extend emission region. In the flexible EL lamp, a phosphor layer, a dielectric layer, and a front electrode layer are exposed to the outside by extending to edge portion of the product. The phosphor layer that is vulnerable to moisture is formed of the phosphor material to which water repellent process is performed. Therefore, the reliability characteristic with respect to moisture can be obtained. The EL lamp can facilitate the design of the compact mobile phones and can improve the reliability of the product.

Abstract: An organic electroluminescent display panel includes a substrate, a plurality of first electrodes forming parallel stripes on the substrate, a plurality of electrical insulating partitions intersecting the first electrodes, an organic electroluminescent layer formed on the first electrodes and the partitions, a plurality of second electrodes located on the organic electroluminescent layer, and a sealing film. The second electrodes form stripes parallel with the partitions. An organic electroluminescent element is formed at each intersection of the first and second electrodes. The sealing film covers exposed portions of the first electrodes, the organic electroluminescent layer, the partitions, and the second electrodes. Each partition has an inverse tapered portion with a widened distal end.

Abstract: A device for controlling the atmosphere in a space (16) which is partly delimited by at least one glass component (12, 13; 61) and which is separated from the environment (17, 18), with at least one connection between the space and the environment, and with at least one electrically actuatable valve (32, 33; 47, 48) associated with the connection, which valve is connected to an electric control unit (24); the valve (32, 33; 47, 48) is arranged in a connecting passage (34) within a member (15A) delimiting the space (16), namely in the case of an insulating glass assembly (11), a connecting ledge (15) arranged between two glass panes (12, 13) or, in the case of a lamp (60), in a socket (64), and the control unit (24) provided for an automatic actuation of the valve is also arranged in said member (15A).

Abstract: A planar light source is provided, and the planar light source includes a first plasma planar lamp and a second plasma planar lamp. The second plasma planar lamp is disposed on the first plasma planar lamp. The first and second plasma planar lamp have a plurality of bright regions and dark regions, respectively, wherein through allocating the bright regions and dark regions, the light emitted from the bright regions of the first plasma planar lamp is able to pass through the dark regions of the second plasma planar lamp. As mentioned above, the brightness of the planar light source can be improved.

Abstract: A flat panel display having an improved impact resistance performance is provided. The flat panel display includes a front panel made up of a transparent substrate and a laminate that is fixed to the back side of the transparent substrate, and a back panel that is adhered to the front panel. The transparent substrate of the front panel has a remaining tensile stress while the laminate of the same has a remaining compressive stress.

Abstract: A phosphor layer to improve the light emitting efficiency and color purity and a plasma display panel using the same are provided. According to an embodiment, the phosphor layer includes a phosphor to be excited by a discharge gas and to emit light of a specific color, and a photonic crystal and having a photonic band gap.

Abstract: A plasma display panel may include a first substrate and a second substrate facing each other, barrier ribs disposed between the first substrate and the second substrate, and at least partially defining a plurality of discharge cells therebetween, a plurality of pairs of discharge electrodes for generating a discharge in the discharge cells, the plurality of pairs of discharge electrodes being arranged in non-display portions of the plasma display panel, and a color filter layer disposed between the barrier ribs and the first substrate.

Abstract: Disclosed herein is a light source device. The light source device includes a front transparent substrate, a rear substrate, a plurality of partitions, and fluorescent material. The rear substrate is configured to face the front transparent substrate with a discharge space disposed therebetween. The partitions are arranged between the front transparent substrate and the rear substrate to divide the discharge space into a plurality of discharge channels. The fluorescent material is applied on the inside of the discharge space. Meanwhile, the partitions are formed such that the ratio of the radius of curvature R of each partition to the width W of the partition, that is, R/W, ranges from 0.1 to 4.

Abstract: An arc tube is provided for use in a high intensity discharge lamp. The arc tube is generally comprised of an elongated outer envelope defining two opposed ends and a cavity therebetween; an electrode sleeve protruding outwardly from each end of the outer envelope, such that each electrode sleeve has a passageway; and an electrical feedthrough member inserted into the passageway of the electrode sleeve, where the feedthrough member includes an inner rod that extends into the cavity of the arc tube and a ceramic sleeve encircling a portion of the inner rod disposed within the passageway. A sealing compound is disposed at an outwardly facing end of the passageway for sealing the feedthrough member to the electrode sleeve, such that the sealing compound extends into the passageway of the electrode sleeve but is spatially separated from the ceramic sleeve.

Abstract: It's about a new kind of fluorescent springlamp, which includes lamp base (1), lower part of the plastic housing (2), cover for the plastic housing (3), spiral lamp tube (4), the PCB that placed inside the plastic housing (5) and some other components. Among them, the legs of the tube with filaments in them are straight. The characteristic of this springlamp is there are two notches on the PCB, and two holes on the upper cover of the housing as well, so the straight part of the tube can be placed in the housing. Moreover, the length of the straight part of the tube can be longer than the distance between the PCB in the housing and the top of the housing. This method can greatly reduce the overall height of the lamp and reduce the operating temperature in the housing, which increased the working efficiency of the lamp and prolonged the lamp life. The diameter of the housing can be less than the diameter of the spiral tube part of the lamp, making the lamp more adaptable to all kinds of lamp fixtures.

Abstract: A backlight unit using a microwave plasma ultraviolet lamp as a light source and a liquid crystal display including the backlight unit. The backlight unit for a liquid crystal display comprises a tube filled with discharge gas, a cavity resonator in which one end of the tube is inserted, a magnetron for generating microwaves and supplying the generated microwaves to the cavity resonator, a magnetron driver for driving the magnetron, and a phosphor layer for converting ultraviolet light generated in the tube into visible light.

Abstract: A lamp package includes a base for insertion into an electrical socket, a complete dimmable ballast circuit contained within and electrically connected to the base, and a fluorescent lamp, including a CFLP, connected to and dimmed through the ballast circuit. The base includes a thermally conductive body, such as an epoxy, so that the base dissipates heat from the ballast. The package also includes a diffuser, possibly connected directly to the base, that surrounds the lamp. In a further aspect of the invention, the lamp package includes one or more of a variety of sensors, such as a photodetector, that are connected to the dimmable ballast circuit, thereby providing a self-dimming lamp. The self-dimming lamp is suitable for use in a standard Edison socket and with CFLPs to provide a self-regulated light output. Various lighting schemes may be incorporated into the dimmable ballast circuit, such as regulated light output applications.

Abstract: A strongly-ionized plasma generator includes a chamber for confining a feed gas. An anode is positioned inside the chamber. A cathode assembly is positioned adjacent to the anode inside the chamber. An output of a pulsed power supply is electrically connected between the anode and the cathode assembly. The pulsed power supply comprising solid state switches that are controlled by micropulses generated by drivers. At least one of a pulse width and a duty cycle of the micropulses is varied so that the power supply generates a multi-step voltage waveform at the output having a low-power stage including a peak voltage and a rise time that is sufficient to generate a plasma from the feed gas and a transient stage including a peak voltage and a rise time that is sufficient to generate a more strongly-ionized plasma.

Abstract: The invention relates to a method of determining a zero point (V0) of a current sensor in a circuit arrangement for operating a gas discharge lamp. The invention is characterized by the following process steps: the current (11) through the sensor is switched off for a short period during a first half wave (13) and a first test value (V6) is determined, then the current (11) through the sensor is switched off for a short period during a second half wave (14) having a different polarity and a second test value (?V7) is determined, whereupon an average value is formed of the two test values (V6, ?V7), and the zero point (Vx, V0) is determined by means of said average value. It is prevented thereby that the zero point drifts during lamp operation, for example owing to heating, and that amplitudes of the positive and negative half waves (13, 14) of the lamp current (11) are formed differently. Impairment of lamp life and visible artefacts in a presented projection image are prevented.

Abstract: Control methods and apparatus are disclosed for operating a full-bridge inverter at resonant frequency mode, hybrid frequency mode, and fixed frequency mode. The operating frequency of the inverter equals to the user programmed frequency if the user programmed frequency is above the resonant tank frequency; and the operating frequency is synchronized with the resonant tank frequency if the user programmed frequency is below the resonant tank frequency.

Abstract: A high pressure discharge lamp lighting device includes: a DC power supply circuit that is supplied with a DC voltage and performs current control to supply a predetermined constant power to a high pressure discharge lamp; an inverter that converts an output current of the DC power supply circuit into an AC current having a predetermined frequency and supplies a driving current to the high pressure discharge lamp; and a control unit that controls the DC power supply circuit and the inverter. In the high pressure discharge lamp lighting device, the control unit superposes a current pulse asynchronous with the driving current on the driving current.

Abstract: A driving device for driving a light source module (32) includes a switch circuit (30), a transformer circuit (31), a voltage sensing circuit (34), a current sensing circuit (35), and a PWM controller (33). The switch circuit converts a received direct current (DC) power signal to an alternating current (AC) signal. The transformer circuit converts the AC signal to an appropriate signal to drive the light source module. The voltage sensing circuit receives the DC power signal and senses a voltage level of the DC power signal. The current sensing circuit receives the DC power signal and senses a current level of the DC power signal. The PWM controller controls the AC signal output from the switch circuit according to the sensed voltage and current levels.

Abstract: To provide a discharge lamp ignition device to light high-intensity discharge lamps in which, during alternating current ignition, the fluctuation of luminous flux on the reversal of polarity of the voltage impressed on the lamp is minimized and in which steady lighting characteristics of the discharge at startup are secured, a discharge lamp ignition device has a capacitor Ch connected to a transformer Th and an intermittent voltage impression arrangement Uj to drive voltage impression on the primary winding Ph, with the secondary winding Sh of the transformer Th constituted so that the voltage generated in the secondary winding Sh can be impressed overlapping the output voltage of an inverter Ui between the electrodes of the discharge lamp Ld by interposing it in the path connecting the output of the inverter Ui and the electrode for the main discharge of the discharge lamp Ld.

Abstract: A dimming mode selecting circuit (25) includes a switch circuit (251) and a compensation circuit (252). The switch circuit selects a first input voltage or a second input voltage according to an input signal. The compensation circuit connects to the switch circuit, for compensating voltage loss of the first input voltage or the second input voltage in the dimming mode selecting circuit, and outputting a first compensated input voltage or a second compensated input voltage according to the switch circuit. In the invention, the dimming mode selecting circuit combines a hysteresis circuit (250) with the compensation circuit, to make the input signal stably and the output signal reliably. The structure of the circuit is simple.

Abstract: An electronic ballast for driving a gas discharge lamp avoids mercury pumping in the lamp by adaptively changing an operating frequency of an inverter of the ballast when operating near high-end. The inverter of the ballast generates a high-frequency AC voltage, which is characterized by the operating frequency and an operating duty cycle. The ballast also comprises a resonant tank for coupling the high-frequency AC voltage to the lamp to generate a present lamp current through the lamp, and a current sense circuit for determining the magnitude of the present lamp current. A hybrid analog/digital control circuit controls both the operating frequency and the operating duty cycle of the inverter with closed-loop techniques. The control circuit adjusts the duty cycle of the inverter in response to a target lamp current and the present lamp current. To avoid mercury pumping, the control circuit attempts to maximize the duty cycle of the inverter when operating at high-end.

Abstract: An apparatus for driving an LED is provided. The driving apparatus may have an LED unit including at least one LED, and a current controlling unit for controlling the magnitude of current flowing through the LED unit in response to a control signal. The LED driving apparatus may include a voltage detecting unit for detecting a voltage across the LED unit and a control signal blocking unit for comparing the voltage detected by the voltage detecting unit with a reference voltage. The control signal blocking part prevents the control signal from being applied to the current controlling unit when the detected voltage is lower than the reference voltage. With this configuration, the LED driving apparatus is capable of preventing a circuit from being damaged by overcurrent by cutting off a control signal when a determined number or more of LEDs are short-circuited or otherwise not operational.

Abstract: In a lamp lighting apparatus for lighting a high intensity discharge lamp, which is used for a projector, it is possible to carry out high speed modulation of brightness of the discharge lamp, in synchronization with a conversion operation to sequential color light flux which is carried out by using a dynamic filter such as a rotation color wheel, and it is also possible to switch modulation patterns by electric control. A lamp current detection signal conversion circuit has two or more switching elements whose ON/OFF state is controlled corresponding to truth/false of respective bits of modulation signal, in which a gain can be changed by a combination of truth and false of the respective bits of the modulation signal. When a modulation switching timing signal is received, an original modulation signal is updated by selecting a bit set corresponding to a value counted by a modulation change count section.

Abstract: Methods and apparatus for high power factor power transfer to a load using a single switching stage. In exemplary implementations, a controllable variable power may be delivered to a load using a single switching stage while maintaining high power factor, in some cases without requiring any feedback information relating to the load conditions (i.e., without monitoring load voltage and/or current) to control normal switching operations in the single switching stage, and without requiring regulation of load voltage and/or load current. In one example, a single stage high power factor driver is used to control power delivery to an LED-based light source.

Abstract: The backlight module includes a first lamp, a second lamp, a circuit board and a driving circuit board. The circuit board includes chambers to be connected to the first lamp and the second lamp, and capacitors to stabilize a voltage across two ends of each of the first lamp and the second lamp. The driving circuit board includes an inverter for driving the first lamp and the second lamp via the circuit board.

Abstract: A master unit and a plurality of slave units are connected by way of a communication path. The master unit sends to the slave units timing signals generated by its own cycle signal generator by way of a communication path. The slave units determine the cycle difference and the phase difference between a timing signal generated by its own cycle signal generator and the timing signal sent from the master unit and, in accordance therewith, determine a cycle adjustment amount. The cycle signal generators of the slave units adjust the timing signal cycle based on the cycle adjustment amount.

Abstract: A control unit of a motor driver performs feedback control to supply current to a linear motor based on a detection value of a linear encoder. An anomaly detection unit monitors the supply current to the linear motor, and the anomaly detection unit detects anomaly of a linear motion apparatus based on a waveform of the supply current. In the case where the anomaly is detected, a user is notified of warning by means of a lamp, a buzzer, an e-mail, and the like. Therefore, the anomaly of the linear motion apparatus can be detected early and accurately.

Abstract: A linear drive apparatus comprising: a guide having an internal body; a slider moved along the guide, a driving mechanism for generating a driving force by magnetic interaction of the slider with the guide so as to linearly drive the slider; and a magnetic measurement unit having a magnetic scale and a detector which are opposed to each other and change a relative position relative to each other in order to obtain the relative position of the slider relative to the guide, wherein an opposing direction of the magnetic scale and the detector is the direction of the outer circumference of the guide, and the detector detects a signal from the magnetic scale in accordance with the relative position of the slider, whereby the relative position of the slider is obtained.

Abstract: In order to improve reliability, cost performance, and cooling property, a control device integrated dynamo-electric machine mounted to a dynamo-electric machine includes an inverter bridge configured with a plurality of semiconductor switching elements, and a plurality of heat sinks provided for respective arms of the inverter bridge and having the semiconductor switching elements of the corresponding arms mounted thereon for cooling the mounted semiconductor switching elements, wherein the semiconductor switching element includes a plurality of semiconductor switching devices arranged in parallel, and the plurality of semiconductor switching devices arranged in parallel are mounted on the common heat sinks.

Abstract: An operating system which utilizes a multi-functional wall station for a motorized barrier includes an operator for controlling movement of a barrier between various positions. The operator may receive signals from a wireless or wired wall station transmitter, a wireless keyless entry device and/or a portable remote transmitter device. The multi-function wall station provides for selective concealment of certain switches or buttons which are not commonly used in the day-to-day operation of a wall station. For example, the up/down switch may be actuated by a hinged cover which conceals other selected operational buttons and wherein those operational buttons are only accessed upon opening of the hinged cover. The wall station also provides a periodic lighting element so as to easily direct the user to push the hinge cover to initiate up/down movement of the barrier.

Abstract: Provided is a motor having a magnetic polar unit in which a permanent magnetic polar array having arranged therein alternately a plurality of permanent magnetic polar elements in alternate opposite poles is made to face a plurality of electromagnetic coil arrays alternately excited at opposite poles, and the permanent magnetic polar array is made to move thereby; wherein the motor further comprises a sensor for detecting the periodical magnetic change accompanying the movement of the permanent magnetic polar array, the output of the sensor is directly returned as a direct drive waveform to the electromagnetic coils, and this drive circuit forms the excitation signal based on the return signal.

Abstract: A control system and method for closing a window on an unattended vehicle includes a window actuator coupled to the window and adapted to move the window. An occupant detection system generates an occupant signal. A rain sensor generates a rain signal. A window obstruction sensor generates an obstruction signal based on an object obstructing a path of the window. A controller communicates with the occupant detection system, the rain sensor and the window obstruction sensor and generates and communicates a window signal to the window actuator based on the occupant signal, the rain signal and the obstruction signal.

Abstract: A controller for a servomotor capable of improving accuracy of positioning and quality of a machined surface by switching modes of correction of a position command or the like, and reducing a shock at the time of switching. A correction amount generating section obtains a correction amount based on a value of a correction factor such as machine temperature. When the external signal is in ON state, a position command or the like is corrected by the correction amount obtained by the correction amount generating section and sent via switches. A correction amount holding section holds the correction amount obtained by the correction amount generating section. When the external signal turns to OFF state, the connection of the switches is changed so that correction is performed by the correction amount held in the correction amount holding section. When the connection of the switches is changed, the correction amount does not change rapidly, so that the machine does not suffer a shock.