JP4110448B2 - Method for regular finishing of printed wiring board, printed wiring board, discharge lamp lighting device, and lighting fixture - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a printed wiring board provided in circuit modules constituting various circuits, a method for regular finishing of a printed wiring board that is cut out from a blank panel to a regular size, and a circuit module that forms a discharge lamp lighting circuit. The present invention relates to a discharge lamp lighting device for lighting an electric lamp, and a lighting fixture such as a fluorescent lamp lighting fixture provided with the lighting device.
[0002]
[Prior art]
The printed wiring board provided in the electronic discharge lamp lighting device is obtained by cutting out from a hard blank panel. In order to facilitate this cutting, the plank panel is provided with a slit row formed by arranging a plurality of slits extending in the longitudinal direction in a straight line. The slits in each slit row have the same width (slit width) in each part, and this width is set slightly larger than the diameter of the rotary cutting tool commonly called a router.
[0003]
By cutting the connecting part between each slit in this blank panel according to the following procedure, the part between the slit rows adjacent in the width direction of the blank panel is obtained as a fixed-size printed wiring board on which circuit components are mounted. ing.
[0004]
In the cutting of the connecting portion, after inserting a rotationally driven cutting tool into one of the slits adjacent in the row direction of the slit row, the cutting tool is moved toward the adjacent end of the other slit. Is done. In this case, since the cutting tool cuts and cuts the joint portion, both side edges of the obtained fixed-size printed wiring board are formed in a straight line. Note that microscopically, a slight convex portion corresponding to the clearance between the slit width and the diameter of the cutting tool may be provided at the position where the connecting portion was present.
[0005]
[Problems to be solved by the invention]
Since it is necessary for the cutting tool to pass through each slit provided in the blank panel with a certain margin, the slit width of each slit is a size obtained by adding a dimension of, for example, about 0.1 mm to the diameter of the cutting tool. Is set. Therefore, when multi-sided printed wiring board from the blank panel, the printed wiring board obtained by cutting from this blank panel is accompanied by the increase in the outer shape of the blank panel according to the wide slit width of each slit. Cost is high.
[0006]
The rigidity against the warp of the blank panel provided with the slit row is determined by the number of slits and the length of the connecting portion (distance between slits). Therefore, as the length of the slit is longer and the number of slits is increased, the number of the connecting portions is reduced and the distance is shortened, so that the rigidity against the warp of the blank panel is lowered.
[0007]
A blank panel having low rigidity is likely to warp due to a heavy circuit component when the circuit component is temporarily attached thereto and conveyed to a solder bath or the like. Further, when the circuit component temporarily attached to the blank panel is flow soldered, the blank panel is likely to warp due to heat applied from below the blank panel. Such warpage is a cause of poor soldering, and is therefore desired to be suppressed.
[0008]
The rigidity of the blank panel against warping can be improved by increasing the distance between the slits. However, if it does in this way, since the cutting time of the said connection part by a cutting tool will become long, the cost for cutting out a printed wiring board from a blank panel will rise, and it is apparatus, such as a discharge lamp lighting device provided with this wiring board It also affects the cost.
[0009]
SUMMARY OF THE INVENTION A first problem to be solved by the present invention is to obtain a method for finishing a printed wiring board that can cut out a printed wiring board having a fixed size and a high quality from a blank panel at a low cost.
[0010]
A second problem to be solved by the present invention is to obtain a high-quality and inexpensive printed wiring board, discharge lamp lighting device, and lighting fixture.
[0011]
[Means for Solving the Problems]
In order to solve the first problem, a method for finishing a printed wiring board according to a first aspect of the present invention includes a slit row forming step and a cutting step. In the slit row forming step, a portion other than the cutting tool insertion hole is formed with a slit width narrower than the diameter of the cutting tool insertion hole at one end in the longitudinal direction, and the other end in the longitudinal direction is the same as the slit width. a plurality of slits that are or width dimension der Ru U-shaped formed on the tapering a width of less than the slit width, the slit rows formed by arranging in a straight line, providing a plurality blank panels. In this slit row forming step, the slit row is divided into the cutting tool insertion hole at one end in the longitudinal direction, the connecting portion, and the lengths of the other slits adjacent to each other in the row direction with the connecting portion in between. The other end in the direction is formed side by side so as to be continuous along the moving direction of the rotary cutting tool. In the cutting step, the rotary cutting tool having a circular cross section larger than the slit width and smaller than the diameter of the cutting tool insertion hole is inserted into the cutting tool insertion hole, and the other adjacent to the cutting tool insertion hole. By moving the slit toward the other end in the longitudinal direction of the slit, the connecting portion between the slits adjacent in the row direction of the slit row is cut, and the wiring between the slit rows adjacent in the width direction of the blank panel is cut Cut out the board area.
[0012]
The invention of claim 1 is applied to a method for finishing at least one printed wiring board to a fixed size from a rigid blank panel. It can be suitably applied to a chamfered regular finishing method.
[0013]
In the first aspect of the invention, the slit width of the portion other than the cutting tool insertion hole provided at one end in the longitudinal direction of each slit formed in the blank panel by the slit row forming step is the cutting tool insertion hole. Narrower than the diameter of the part. Therefore, the width of the end of the slit positioned in the moving direction of the cutting tool (referred to as an adjacent end) is cut after being inserted into the cutting tool insertion hole of the slit adjacent to this end. Smaller than the tool diameter. Therefore, when cutting the connecting portion between the slits in the next cutting step, the cutting of the connecting portion is completed when the front portion in the moving direction of the cutting tool overlaps the adjacent end portion. In this way, since it is not necessary for the entire cutting tool to overlap the adjacent end portion, the cutting tool insertion hole is provided under the condition that the moving distance of the cutting tool for cutting the connecting portion is the same as the conventional one. It is possible to increase the length of the connecting portion by moving the adjacent end portion away from the portion. Therefore, the rigidity with respect to the warp of the blank panel can be improved, and even if the length of the connecting portion increases, the time required for the cutting does not take long. Further, as described above, the slit width of each slit is narrow except for the cutting tool insertion hole, and accordingly, a standard printed wiring board can be cut out from this panel using a small blank panel. .
[0014]
In order to solve the second problem, a printed wiring board according to a second aspect of the present invention includes a plurality of cut surfaces formed by the regular finishing method according to the first aspect on each of both side edges, A recess adjacent to one end of the processed surface is provided at intervals along the direction in which the side edge extends.
[0015]
In the second aspect of the invention, since the both side edges of the printed wiring board are formed by applying the regular finishing method of the first aspect of the invention, the cutting cost for cutting out the printed wiring board from the blank panel In addition, the cost of the printed wiring board can be reduced as the size of the blank panel is reduced. And since the curvature until this printed wiring board is cut out from a blank panel is suppressed, the soldering defect can be prevented.
[0016]
In order to solve the second problem, a discharge lamp lighting device according to a third aspect of the present invention includes a case body and a terminal block mounted on the end portion in the longitudinal direction of the printed wiring board according to the second aspect. A circuit module is mounted on the part, the terminal block is arranged outside the case body, and the circuit module is housed in the case body.
[0017]
In the invention of claim 3, since the printed wiring board of claim 2 having high soldering quality and low cost is provided, the quality of the discharge lamp lighting device can be improved and the cost can be reduced accordingly.
[0018]
In order to solve the second problem, according to a fourth aspect of the present invention, a lighting fixture includes a printed wiring board having a high soldering quality and a low price. Since the lighting device is provided, the quality of the lighting fixture can be improved and the cost can be reduced accordingly.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
[0020]
A lighting fixture 1 shown in FIG. 1 includes an elongated box-shaped chassis 2 having an open lower surface, and the lower surface of the chassis 2 is covered with a reflector 3. For example, fluorescent lamp sockets 4 are mounted as lamp sockets at both ends in the longitudinal direction of the chassis 2, and these sockets 4 penetrate both ends in the longitudinal direction of the reflector 3. A discharge lamp lighting device 5 called a so-called electronic ballast is accommodated in the chassis 2. A straight tube fluorescent lamp 6 as a discharge lamp that is lit by the lighting device 5 is connected to and supported by the lamp socket 4 so as to be removable at both longitudinal ends thereof, and is disposed below the reflector 3.
[0021]
A discharge lamp lighting device 5 shown in FIG. 2 includes a case body 11 and a circuit module 12. The case body 11 is formed in an elongated box-like container shape by connecting an aluminum alloy base case 13 and a cover case 14 . The circuit module 12 is housed in the case body 11 except for both ends in the longitudinal direction. The circuit module 12 is electrically insulated from the case body 11 by an insulating sheet (not shown) provided so as to surround the circuit module 12, and controls the lighting of the fluorescent lamp 6 by performing power conversion by inverter control.
[0022]
Fixing holes 13a (only one is shown) are formed at both ends of the base case 13 in the longitudinal direction. By screwing screws (not shown) passed through the fixing holes 13a into the chassis 2, the discharge lamp lighting device 5 is attached to the chassis 2 in an upside down posture from the posture shown in FIG. In this attached state, the base case 13 comes into contact with the inner surface of the chassis 2 and the heat of the discharge lamp lighting device 5 can be released to the chassis 2.
[0023]
The cover case 14 is shorter than the base case 13, thereby exposing both longitudinal ends of the circuit module 12 to both longitudinal ends of the case body 11. In FIG. 2, reference numeral 14a denotes an end plate (only one is shown) formed by bending both ends in the longitudinal direction of the cover case 14, and the end in the longitudinal direction of the circuit module 12 is exposed with the end plate 14a as a boundary. Yes.
[0024]
The circuit module 12 includes a printed wiring board 15, a large number of circuit components 16 mounted on at least one surface of the wiring board 15, an input side terminal block 17, and an output side terminal block 18.
[0025]
The terminal blocks 17 and 18 are individually mounted on both ends in the longitudinal direction of the printed wiring board 15 exposed from the case body 11. A power supply wire (not shown) is inserted and connected to the terminal block 17. An in-appliance wiring wire (not shown) is inserted and connected to the output side terminal block 18.
[0026]
The printed wiring board 15 has a hard insulating substrate whose one surface is a component mounting surface such as various circuit components 16, a wiring layer composed of a copper foil pattern or the like laminated on the other surface, and a solder covering the wiring layer. And a resist layer. Therefore, although the printed wiring board 15 of this embodiment is a single-sided mounting type, the present invention is not limited to this, and a double-sided mounting type printed wiring board or a multilayer printed wiring board can also be used in the present invention. Many circuit components 16 and the wiring layer form a lighting circuit for controlling the lighting of the fluorescent lamp 6. One surface of the printed wiring board 15 on which each circuit component 16 is mounted is covered with a cover case 14 except for both ends in the longitudinal direction.
[0027]
The printed wiring board 15 is obtained by cutting out to a fixed length (predetermined dimensions) from the multi-panel blank panel 21 illustrated in FIG. Slit rows 22 extending in the longitudinal direction of the panel 21 are provided on both sides of the blank panel 21, and one or more slit rows 23 extending in the longitudinal direction of the blank panel 21 are also provided in the middle portion. ing. The pair of slit rows 22 is formed by arranging a plurality of, for example, four slits 22a to 22d in a straight line at regular intervals. Similarly, the slit row 23 at the intermediate position is also formed by arranging a plurality of, for example, four slits 23a to 23d in a straight line at regular intervals.
[0028]
Each of the slits 22a to 22d and 23a to 23d has the same configuration, and has a circular cutting tool insertion hole 24 at one end in the longitudinal direction as representatively shown in FIG. The slit width A of the hole portion extending from the portion 24 to the other end in the longitudinal direction is narrower than the diameter (diameter) B of the cutting tool insertion hole 24, and is formed to be, for example, approximately half the diameter B. The center S of the cutting tool insertion hole portion 24 is positioned on the center line a of the elongated hole portion having the slit width A, and is opposite to the cutting tool insertion hole portion 24 of the hole portion having the slit width A. The end portion 25 (hereinafter referred to as an adjacent end portion) 25 has, for example, a U shape. As shown in FIG. 3 (A), each of the slits 22a to 22d and 23a to 23d forming the slit rows 22 and 23 has the cutting tool insertion hole 24 for one row oriented in the same direction and cut for each row. It is provided so that the direction of the tool insertion hole 24 is alternately reversed.
[0029]
The slit row 22 in the blank panel 21 and the side edges 21a of the blank panel 21 are partitioned as a scrap region 21b. The slit rows 22 and 23 and the slit rows 23 in the blank panel 21 are partitioned as a wiring board region 21c. The scrap region 21b and the wiring board region 21c adjacent to each other in the width direction of the blank panel 21 are integrally continuous via a connecting portion 21d between the slits 22a to 22d of the slit row 22. Similarly, the wiring board regions 21c adjacent to each other in the width direction of the blank panel 21 are also integrally connected via a connecting portion 21d between the slits 23a to 23d of the slit row 23.
[0030]
In FIG. 3, reference numeral 21e denotes a slit groove, which is located on an extension line of each of the slit rows 22 and 23 and is provided at both ends of the blank panel 21 so as to be opened.
[0031]
The blank panel 21 having the above-described configuration is produced by using a processing machine (not shown) to obtain a slit forming process in which the slit rows 22 and 23 and the slit groove 21e are provided. In this case, the blank panel 21 is already provided with a wiring layer and a solder resist layer, and the component mounting surface is used for designating the arrangement of mounting components such as the circuit component 16 and the terminal blocks 17 and 18. Silk printing (not shown) is applied. Also, before and after the slit forming step, the blank panel 21 is provided with component mounting holes and the like necessary for mounting mounted components.
[0032]
After this processing, a predetermined circuit component 16 and terminal blocks 17 and 18 are assembled to the wiring panel region 21c in a temporarily fixed state by manual operation or an automatic machine, and then flow soldered. The soldering is performed from the solder resist layer side. The temporary attachment of these mounted parts and the conveyance of the blank panel 21 for soldering are performed by using holes 21f and the like provided at both ends of the scrap area 21b shown in FIG. 3 and supporting both ends in the scrap area 21b. It is.
[0033]
After the soldering, a cutting process to separate the wiring board regions 21c of the blank panel 21 into the printed wiring board 15 is performed by a cutting process described below. This cutting is performed using an automatic cutting machine including a rotary cutting tool 28 commonly called a router. The cutting tool 28 is a rotary cutter in which a grindstone is attached to the outer peripheral surface of a cylinder. With this automatic cutting machine, the rotating cutting tool 28 is moved relative to the blank panel 21 along the direction of the arrow in FIG. 3A, whereby each connecting portion 21d is cut to produce the printed wiring board 15.
[0034]
In this case, the cutting tool 28 escapes the slits 22a to 22d and 23a to 23d and cuts only the connecting portions 21d. The end side connecting portions 21g between the slits 22a, 22d, 23a, 23d at the both end positions and the slit grooves 21e are not to be cut by the cutting tool 28, and these end side connecting portions 21g are bent by hand work or the like. Easy to cut. Thereby, finally, the printed wiring board 15 on which the mounting components such as the circuit component 16 are mounted is separated .
[0035]
The printed wiring board 15 separated in this way is shown in FIG. 4, and this wiring board 15 is finished to a regular size in both vertical and horizontal dimensions. In FIG. 4A, the mounted components and printed information are omitted for convenience of explanation. Each of the side edges 15c of the printed wiring board 15 includes a plurality of cutting surfaces 15a ground by the cutting tool 28 as shown in FIG. 4B, and a recess 15b adjacent to one end of the processing surface 15a. Are provided at predetermined intervals along the direction in which the side edge 15c extends.
[0036]
The cut surface 15a and the recess 15b are formed when the connecting portion 21d is cut by the cutting tool 28 and the printed wiring board 15 is cut out from the blank panel 21. A mode of cutting the connecting portion 21d by the cutting tool 28 will be described as a representative of the slits 22a and 22b adjacent in the row direction of the slit row 22.
[0037]
First, as shown in FIG. 3B, the rotating cutting tool 28 is inserted into the cutting tool insertion hole 24 of one slit 22a, and then this cutting tool 28 is connected to the adjacent end 25 of the other slit 22b. Move towards. With the grinding of the cutting tool 28 thereby, first, a part of the cutting tool insertion hole 24 is left as it is based on the clearance between the cutting tool 28 and the cutting tool insertion hole 24 to form the recess 15b. When the cutting tool 28 is further ground, the front end of the cutting tool 28 in the moving direction reaches the adjacent end 25 of the slit 22b (the position of the cutting tool at this point is indicated by reference numeral 28a). Thus, the cutting of the connecting portion 21d is completed, and the cutting surface 15a having a length corresponding to the moving distance C of the cutting tool 28 is formed. Both the cut surface 15a and the recess 15b are provided to be slightly recessed from the side edge 15c of the printed wiring board 15, and the depth of the recess is shallower on the cut surface 15a and deeper on the recess 15b.
[0038]
In the above separation (cutout) of the printed wiring board 15, the cutting of the connecting portion 21 d is completed when the front end portion in the moving direction of the cutting tool 28 reaches the adjacent end portion 25 as described above. To do. This is realized because the slit width A of the adjacent end portion 25 is narrower than the diameter D of the cutting tool 28.
[0039]
As described above, since the connecting portion 21d can be cut without requiring the entire cutting tool 28 to overlap the adjacent end portion 25, the moving distance C necessary for cutting the connecting portion 21d is set to be the same as the conventional one. In this case, the length E of the connecting portion 21d can be increased. This increased dimension is indicated by symbol F in FIG. The increased dimension F can be expressed by the following equation.
[0040]
F = G + H + √ (G ² −A / 2) ²
Here, symbol G is the radius of the cutting tool 28, H is the clearance between the cutting tool insertion hole 24 and the cutting tool 28 (usually about 0.1 mm), and A is the slit width as described above. From this equation, it can be seen that the length E of the connecting portion 21d can be increased in proportion to the diameter D and the clearance H of the cutting tool 28 and shortened in inverse proportion to the slit width A. Therefore, as described above, the diameter D and the clearance H of the cutting tool 28 are increased, and the slit width A is reduced, so that the dimension of the length E of the connecting portion 21d is indicated by the symbol F in FIG. Can be increased.
[0041]
For the above reason, since the length of each connecting portion 21d included in each slit row 22 and 23 is increased, the rigidity against the warp of the blank panel 21 can be improved. Therefore, when the blank panel 21 is transported or flow soldered, warping of the blank panel 21 is suppressed, and soldering defects are suppressed accordingly. Therefore, the quality of the circuit module 12 can be improved.
[0042]
Moreover, even if the length of the connecting portion 21d is increased as described above, the moving distance C of the cutting tool 28 necessary for cutting the portion 21d is the same as in the prior art and does not increase. Therefore, the cutting time of the connecting portion 21d by the cutting tool 28 becomes long, and the cost for cutting out the printed wiring board 15 from the blank panel 21 does not increase. Therefore, the cost of the discharge lamp lighting device 5 including the wiring board 15 and the lighting fixture 1 including the lighting device 5 is not increased.
[0043]
Further, each of the slits 22a to 22d and 23a to 23d of the blank panel 21 must be formed with a slit width through which the cutting tool 28 passes (this width is the same width as the diameter B of the cutting tool insertion hole 24). .)) And the slit width A of each slit is narrow except for the cutting tool insertion hole 24 provided only at one end in the longitudinal direction. The width of the printed wiring board 15 can be increased by an amount corresponding to a dimensional difference from the narrower slit width A. In addition, since the cutting tool insertion hole 24 is locally provided, the arrangement of the circuit components 16 is not affected. Therefore, the width of the blank panel 21 can be narrowed by setting the width of the printed wiring board 15 to be the same as the conventional design. By using the small blank panel 21 in this way, the cost of the panel 21 itself can be lowered, and accordingly, the printed wiring board 15, the discharge lamp lighting device 5, and the lighting fixture 1 can be contributed to the cost reduction. .
[0044]
The present invention is not limited to the one embodiment. For example, the adjacent end portion 25 of each slit may be tapered as represented by a two-dot chain line in FIG. In this case, when the front end in the moving direction of the cutting tool 28 reaches the adjacent end 25 at the tip of the tapered shape, the cutting of the connecting portion 21d is completed, and therefore the length E of the connecting portion 21d of the blank panel 21 is reached. Can be further increased.
[0045]
【The invention's effect】
According to the invention of claim 1, the length of the connecting portion between the slits adjacent to each other in the slit row is increased so that the rigidity against the warp of the blank panel is improved, and the cutting time of the connecting portion is not prolonged. In addition, since a printed wiring board is cut out from a small blank panel, a fixed length finishing method for a printed wiring board that can cut out a printed wiring board with a fixed length and high soldering quality at a low cost from the blank panel is provided. it can.
[0046]
According to the second aspect of the present invention, the printed wiring board having a high soldering quality can be provided at a low cost because it is finished to a regular size by the inventive method of the first aspect.
[0047]
According to the invention of claim 3, since the printed wiring board of claim 2 having high soldering quality and low cost is provided, a high-quality and inexpensive discharge lamp lighting device can be provided accordingly.
[0048]
According to the invention of claim 4, since the discharge lamp lighting device of claim 3 including a printed wiring board having high soldering quality and low cost is provided, a high-quality and inexpensive lighting fixture is provided accordingly. it can.
[Brief description of the drawings]
FIG. 1 is a side view showing a partial section of a lighting apparatus according to an embodiment of the present invention.
2 is a perspective view showing a discharge lamp lighting device according to an embodiment of the present invention provided in the lighting fixture of FIG. 1. FIG.
3A is a plan view showing a state in which a plurality of slit rows are provided on a blank panel in which a printed wiring board included in the discharge lamp lighting device of FIG. 2 is multi-faced. FIG. FIG. 4B is an enlarged view showing a Z portion in FIG.
4A is a plan view showing a printed wiring board according to an embodiment of the present invention, and FIG. 4B is an enlarged view showing a Y portion in FIG. 4A.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Lighting fixture, 2 ... Chassis, 4 ... Lamp socket, 5 ... Discharge lamp lighting device, 6 ... Fluorescent lamp (discharge lamp), 11 ... Case body, 12 ... Circuit module, 15 ... Printed wiring board, 15a ... Cutting process Surface, 15b ... concave portion, 16 ... circuit component, 17, 18 ... terminal block, 21 ... blank panel, 21c ... wiring board area of blank panel, 21d ... connection portion, 22, 23 ... slit row, 22a-22d, 23a- 23d: Slit, A: Slit width, 24: Cutting tool insertion hole, B: Diameter of cutting tool insertion hole, 25: Adjacent end of slit, 28: Cutting tool, D: Diameter of cutting tool.

Claims (4)

Ru same width der and the slit width in the longitudinal direction of the other end portion with a portion other than the cutting implement insertion hole portion in a narrow slit width are formed than the diameter of the cutting instrument insertion hole portion having one longitudinal end A slit row forming step in which a plurality of slit rows formed in a U shape or a taper shape having a width less than the slit width are arranged in a straight line on a blank panel; and
A rotary cutting tool having a circular cross section larger than the slit width and smaller than the diameter of the cutting tool insertion hole is inserted into the cutting tool insertion hole, and the longitudinal direction of another slit adjacent to the cutting tool insertion hole Cutting that cuts the connecting portion between the slits adjacent in the row direction of the slit row by moving toward the other end, and cuts out the wiring board region between the slit rows adjacent in the width direction of the blank panel Process,
Comprising
The slit row formed in the slit row forming step includes a cutting tool insertion hole at one end in the longitudinal direction, the connecting portion, and the length of another slit adjacent to the slit in the row direction with the connecting portion interposed therebetween. A method for finishing a printed wiring board, characterized in that the other end in the direction is formed side by side so as to be continuous along the moving direction of the rotary cutting tool. A plurality of cut surfaces formed by the regular finishing method according to claim 1 and concave portions adjacent to one end of the processed surfaces are spaced apart from each other on both side edges along the direction in which the side edges extend. A printed wiring board characterized by being provided. The case body,
A terminal block is mounted on an end portion in the longitudinal direction of the printed wiring board according to claim 2, and a circuit component is mounted on an intermediate portion. The terminal block is disposed outside the case body and is housed in the case body. A discharge lamp lighting device comprising: a circuit module. The chassis,
The discharge lamp lighting device according to claim 3 attached to the chassis;
A lamp socket attached to the chassis;
And a discharge lamp that is removably supported by the socket and is lit by the discharge lamp lighting device.

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