JPS6030087A - Device for firing discharge lamp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

TECHNICAL FIELD OF THE INVENTION The present invention relates to a discharge lamp lighting device that switches the polarity of a DC power supply applied to a discharge lamp each time the discharge lamp is turned on or off. Technical background and its rJJ issues Conventionally, when a fluorescent lamp is lit by an AC power source, an anode side with a low luminous intensity and a part of a cathode electrode on a cathode side with a high luminous intensity appear alternately near the end of the tube. I feel a flicker. In order to prevent this glare, fluorescent lamps are powered by a DC power source. however,
In the case of direct current lighting, there are problems such as a dark end effect due to the separation of the filled gas or wear and tear on the electrodes. In order to solve these shortcomings,
As seen in the publication, a polarity reversal device is installed between the rectifier circuit and the two electrodes of the fluorescent lamp to reverse the polarity in conjunction with the start switch.

[There are things that have been written. The specific shape of this polarity reversing device is that two polarity changeover switches are disposed on the outer periphery of a cam that rotates in one direction, and a start switch is interlocked with the pull string that rotates the cam. It is something that exists. In the structure of such a conventional polarity reversing device, since the outer circumference of the cam is used, even if it is attempted to arrange other switches in addition to the two polarity changeover switches, the number of stations is limited to It is difficult to set the power switch to n, and it is difficult to link it with a power switch or the like. OBJECTS OF THE INVENTION An object of the present invention is to provide a discharge lamp lighting device that can reliably switch polarity in conjunction with opening and closing of a power switch. SUMMARY OF THE INVENTION The present invention provides movable contact pieces for a power switch and a polarity changeover switch in parallel, and generates a force 11 that causes a rotating shaft provided along these movable contact pieces to switch the switch every rotation.
Since the switch is arranged in the axial direction, it is possible to reliably switch the polarity in conjunction with switching the power switch, and since the switch arrangement can be arranged in a straight line, there is no structural unreasonableness, and the required number can be easily arranged. It was created in 414. Embodiments of the Invention First, a rectifier circuit 4 is connected to an AC power source 1 with a ballast 2 and a power switch 3 interposed therebetween. This rectifier circuit 4 is connected to electrodes 8 of a fluorescent lamp 7 as a discharge lamp through two polarity changeover switches 5 and 6, and glowless contacts 9 are connected to these electrodes 8. The power switch 3 is comprised of a fixed contact 0, denoted as "a", and a movable contact piece 11, denoted as rbJ. The polarity changeover switch 5 has two fixed contacts 12 and 13 labeled rcJrdJ and a movable contact 1 labeled reJ.
4, and the other polarity changeover switch 6 is "fJr
It consists of two fixed contacts 15, 16 labeled gJ and a movable contact piece 17 labeled rhJ. Furthermore, the glowless contact 9 consists of a movable contact 18 labeled rjJ and a fixed contact 19 labeled rKJ. This fixed contact 19 is formed to be elastic in order to maintain the range of operation of the push button, which will be described later. Next, attach raJrcJrd to the temporary base 20 made of an insulating plate.
JrfJrgJ fixed contacts 10, 12, 13, 15゜1
6 are arranged on a straight line, and above that 1kr bJr eJ
rhJ movable contact pieces 11, 14. ．． 17 are arranged in a normally open state with their movable parts positioned on a straight line. Further, on the other edge, a movable contact 118 and a fixed contact 19 are provided overlapping each other in a normally open state. Notches 21 are formed on both side edges of the base 20, and a case 23 is provided with engaging claws 22 that fit into these notches 21 and are bent. This case 23 has side surfaces 25 bent at right angles from both sides of the upper surface 24.
26 and a support wall 27 formed by partially bending from the upper surface 24. Further, longitudinally long guide notches 28 are formed in parallel in the side surface 26 and the support wall 27, and a guide hole 29 is formed in the upper surface at the center thereof. Therefore, a notch 2 is formed in the guy 1.
Protrusion 30 that fits into 8 and moves up and down and guide hole 2 of 08
an operating body 32 having a push button 31 protruding in one direction from 9;
is provided so as to be biased upwardly by a compression spring 33, and the operating body 32 has a drive piece 34 formed diagonally downward and formed by a leaf spring, and a drive piece 34 extending horizontally to the side and the movable contact piece 18. A suppression piece 35 is formed to suppress the. The head of a rivet for fixing the movable contact piece 17 to the base 20 is fitted into the lower end of the compression spring 33, so that it will not shift during use. Next, a support hole 36.37 is formed in the front side of the side surface 25.26 of the case 23, and a rotating shaft 38 is rotatably installed in this support hole 36.37. This rotation 11111138 has five cams 39, 40, 41
, 42, 4.3 and one ratchet 1-44 are arranged in the axial direction. This ratchet 44 has eight teeth, and the drive piece 34 provided on the operating body 32 is centered. Further, an elastic piece 45 formed separately and integrally with the movable contact piece 17 is also engaged with the ratchets 1 to 44 to prevent rotation. Therefore, one reciprocation of the operating body 32 rotates the rotating shaft 38 by 1/8 rotation. The cam 39 is for the 11.eta. power switch 3, and is formed in a square shape and has four hyper sections at 90 degree intervals. Further, the cams 40 and 41 are for the polarity changeover switch 5, and the cams 42 and 41 are for the polarity changeover switch 5.
．． 43 is for the polarity changeover switch 6;
The cams 40.42 have the same shape with two hyperbars corresponding to the highverts of the cam 39, and the cams 41,43 have two hyperverts perpendicular to these cams 40,42. They have the same shape. In such a configuration, when the push button 31 is pressed, the operating body 32
moves downward, and the driving piece 34 turns the ratchet 44 to rotate the rotation ΦII+ 38 by 1/8 rotation, and slightly later than that timing, the pressing piece 35 turns the movable contact piece]
Press 8 to close the glowless contact 9. When the push button 31 is released, the operating body 33 is raised by the force of the compression spring 33. As a result, OJ by the suppressor 35
By dividing the suppression of J contact 18 by l71v, glowless contact 9
Let's open. When the operating body 33 returns, the rotating shaft 38 does not rotate. However, what is shown in FIG. 4 shows the relationship between the power switch 3 and the polarity changeover switches 5 and 6. In the figure, (a) and (c) are when the lamp is on, (b) and (d) are when it is off, and (a) and (c) are when the power supply to the fluorescent lamp 7 is turned off. The polarity has been switched. 1. First, when the push button 31 is pressed V in the state shown in FIG. 71 (d), the power switch 3 is turned on as shown in FIG. Conductivity occurs between f and h. At the same time, the tallowless contact 9 is also closed. Then, when the fluorescent lamp 7 lights up and the suppression of the push button 31 is released, the glowless contact 9 is opened, and the state shown in FIG. Then, as shown in FIG. 4 (b), the rotating shaft 38 rotates another 1/8 turn, turning off all the switches.Then, when the push button 31 is pressed next,
Fig. 4 (c) As shown in the figure, 1 electric current lE (switch 3 is set to 0)
At the same time as the N switch is turned on, conduction is established between d and 8 of the polarity changeover switch 5 and between 60g and h of the polarity changeover switch, and the polarity of the power source of the fluorescent lamp 7 is changed from the state shown in FIG. 4(a). . By repeating such an operation, the polarity changeover switch 5.6 is changed and the low-lowless contact 9 is turned on and off in conjunction with the ON/OFF of the power switch 3.
〇FF is performed in conjunction. The present invention provides a rotating shaft in which a plurality of cams are arranged in the axial direction in correspondence with the movable contact pieces of the power switch and the movable contact pieces of the polarity changeover switch that are arranged in parallel with each other as described above. Therefore, as the rotating shaft rotates, the ON/OFF of the power switch and the switching of the polarity switch can be performed reliably in conjunction with each other, thereby preventing dark end effects and electrode wear even with DC power supply. In addition, no matter how many switches there are, they can be arranged in the axial direction of the rotating shaft, providing structural leeway, resulting in extremely high stability. It is possible to perform polarity switching.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a circuit diagram, FIG. 2 is an exploded perspective view, FIG. 3 is a partial cross-sectional view, and FIG. 4 (A), (B), and (C). (D) is an explanatory diagram showing changes in the switching states of the power switch and the polarity changeover switch. ■・・・AC power supply, 3 Power switch, 4 Rectifier circuit, 5
~6 Polarity selector switch, 7-Poppy light lamp (discharge lamp), 8-Electrode, 11, 14.17・-riJ moving contact, 3
8.Rotating axis, 39-43.Force 11 Applicant: Toshiba Electric Materials Corporation

Claims (1)

[Claims] a power switch provided between the AC power supply and the rectifier circuit; and a polarity changeover switch provided between the rectifier circuit and the discharge lamp, each of which switches the polarity of the voltage applied to the discharge lamp each time the discharge lamp blinks. movable contact pieces are arranged in parallel, a rotating shaft is provided along the arrangement direction of these movable contact pieces to rotate a predetermined angle each time an operation is performed by the operating section, and the power switch and the polarity changeover switch are connected to the rotating shaft. A discharge lamp lighting device characterized in that a plurality of cams are disposed in the axial direction, the cams being joined to each movable contact piece of the cam and switching the switch every rotation.