JP5382955B2 - Linear lighting device - Google Patents

Description

  The present invention relates to a linear illumination device used for illuminating an object to be inspected, for example, in an image processing inspection.

  Conventionally, when inspecting the quality of industrial products such as sheet-like paper, glass substrates, steel plates, etc., for example, scratches and irregularities on the surface, distortion, adhesion of foreign substances, or the state of product end faces on the production line An image processing inspection using imaging by a CCD camera or the like is performed. In this image processing inspection, a linear illumination device for illuminating an object to be inspected arranged on an irradiation surface is used.

  A conventional linear illumination device includes a linear light source unit and a power source control unit for controlling lighting of the linear light source unit (see, for example, Patent Document 1). The linear light source unit includes a plurality of LEDs, a printed wiring board on which the LEDs are mounted in a line, and a cylindrical condenser lens disposed in front of the LEDs. The power control unit includes a light amount setting unit that sets a light amount of light from the LED, and a dimming unit that controls lighting of the LED with the set light amount.

JP 2001-215115 A

  The dimming means described above regards all of the plurality of LEDs as one light source and controls the entire LEDs in a lump, resulting in the following problems. First, variation in the amount of light from each LED due to individual differences among the LEDs may cause variation in the amount of light in the longitudinal direction of the linear light source unit. Even if the light quantity of the entire LEDs is increased in this state, the relative variation of the light quantity remains generated, and the uniformity of the light quantity in the longitudinal direction of the linear light source unit cannot be ensured. Secondly, in the linear light source system in which the LEDs are arranged in a line, the light amount is reduced at both ends in the longitudinal direction regardless of variations in the individual light amounts of the LEDs. In this state, even if the amount of light of the entire LED is increased, the amount of light at both ends remains relatively decreased, and the uniformity of the amount of light in the longitudinal direction of the linear light source unit cannot be ensured as described above. .

  The objective of this invention is providing the linear illuminating device which can ensure the uniformity of the light quantity in the longitudinal direction of a linear light source part.

In the linear illumination device of the present invention, in the linear illumination device comprising: a linear light source unit; and a power source control unit that is connected to the linear light source unit with a cable and controls lighting of the linear light source unit.
The linear light source unit includes a light source unit in which a plurality of LEDs are linearly arranged on a first printed wiring board, and a dimming circuit for adjusting the amount of light from the plurality of LEDs of the light source unit. A dimming unit provided on the wiring board, and the linear light source unit is arranged by arranging a plurality of the light source units side by side in a predetermined direction in a casing constituting the linear light source unit. All of the plurality of LEDs of each light source unit are configured to be linear in the predetermined direction. On the other hand, the same number of light control units as the light source units are arranged in the casing in the predetermined direction. And the first printed wiring board and the second printed wiring board of the dimming unit are electrically connected via a connection wiring, and each of the plurality of dimming units includes a second pre-printed circuit board. And a pair of first printed wiring boards adjacent to each other among the first printed wiring boards of the light source unit, connected to the power supply control unit via a plurality of control wirings. Are connected via the power supply wiring, the first printed wiring board on the most upstream side is connected to the power supply control section through the cable, and the power supply control section is connected to the plurality of the plurality of power supply control lines via the cable and the power supply wiring Drive power is supplied to each of the light source units, and the light control circuits of each of the plurality of light control units are independently driven and controlled via the plurality of control wires . It is characterized by.

Further, the power control unit includes a dimming unit selection unit that selects a specific dimming unit among the plurality of dimming units, and the plurality of LEDs of the light source unit corresponding to the specific dimming unit. A light amount setting means for setting the light amount of light, a dimming signal generating means for generating a dimming signal corresponding to the set light amount, and outputting the dimming signal to the dimming circuit of the specific dimming unit Dimming signal output means for
The dimming signal from the dimming signal output means is output to the dimming circuit of the specific dimming unit via the control wiring.

  According to the linear illumination device of the present invention, the linear light source unit includes a plurality of light source units arranged in a predetermined direction, and a plurality of light control units provided corresponding to each of the plurality of light source units. ,have. Since the power supply control unit independently controls and controls the dimming circuits of each of the plurality of dimming units, for example, the LED at a predetermined portion in the longitudinal direction of the linear light source unit due to the variation in the amount of light due to the individual difference of the LEDs. When the amount of light is low, drive control of the light control circuit of the light control unit disposed in the predetermined portion to increase the light amount, to ensure the uniformity of the light amount in the longitudinal direction of the linear light source unit, The illuminance on the irradiated surface can be made uniform. Moreover, since the light quantity of the light source unit of the both ends of the linear light source part in the longitudinal direction can be increased, the light quantity of both ends can be made uniform.

  Further, according to the linear illumination device of the present invention, each printed wiring board of the plurality of light control units is connected in a daisy chain to the power supply control unit via the plurality of control wires. The number of wirings between the light source unit and the power supply control unit can be reduced, and the wiring state can be simplified.

  Further, according to the linear illumination device of the present invention, a specific light control unit is selected from among the plurality of light control units by the light control unit selection means, and the light source unit corresponding to the specific light control unit by the light amount setting means. By adjusting the light quantity of the LED, a dimming signal corresponding to the set light quantity is generated by the dimming signal generation means, and the dimming signal is generated by the dimming signal output means. Is output. In this way, a dimming signal can be reliably output to the dimming unit corresponding to the light source unit with a low light quantity.

It is a perspective view which shows the linear illuminating device by one Embodiment of this invention. It is a disassembled perspective view which decomposes | disassembles and shows a part of linear light source part. It is a partial expansion perspective view which expands and shows a part of linear light source part of FIG. It is sectional drawing of the linear light source part by the AA line in FIG. (A) is a figure which shows the illumination intensity distribution in the longitudinal direction of an irradiation surface, (b) is sectional drawing of the linear light source part by the BB line in FIG. It is a block diagram which shows simply the circuit structure of a linear light source part and a power supply control part.

  Hereinafter, an embodiment of a linear illumination device according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view showing a linear illumination device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view showing a part of a linear light source section, and FIG. FIG. 4 is a partially enlarged perspective view showing a part of the linear light source unit in an enlarged manner, FIG. 4 is a cross-sectional view of the linear light source unit along the line AA in FIG. 1, and FIG. It is a figure which shows the illumination intensity distribution in the longitudinal direction of an irradiation surface, FIG.5 (b) is sectional drawing of the linear light source part by the BB line in FIG. 1, FIG. 6 shows a linear light source part and a power supply. It is a block diagram which shows simply the circuit structure of a control part.

  The linear illumination device 1 of the present embodiment includes a linear light source unit 2 and a power supply control unit 3 for controlling lighting of the linear light source unit 2. The linear light source unit 2 and the power supply control unit 3 are connected to each other via a cable 4 (see FIG. 1). Hereinafter, the configuration of the linear illumination device 1 will be described in detail.

  The linear light source unit 2 includes a casing 5 and a cover 6 having a U-shaped cross section that is detachably attached to the casing 5. The casing 5 includes a horizontally long bottom plate 7, a side plate 8 that extends substantially vertically from one end portion of the bottom plate 7, a plurality of support plates 9 that extend substantially vertically from the other end portion of the bottom plate 7, and both end portions of the bottom plate 7. And a pair of end plates 10 extending substantially vertically. The plurality of support plates 9 are arranged at intervals in the longitudinal direction of the bottom plate 7. The casing 5 is configured in a box shape having an upper surface opened by the bottom plate 7, the side plate 8, the plurality of support plates 9, and the pair of end plates 10. On the outer surface of the bottom plate 7, a radiating fin group 11 is provided in the longitudinal direction. The casing 5 is made of a metal with high heat dissipation such as aluminum.

  The cover 6 includes a horizontally long top plate 12 and a pair of side plates 13 and 14 that extend substantially vertically from both side end portions of the top plate 12. The top plate 12 is provided with a horizontally long and rectangular irradiation window 15. The height of one side plate 13 is configured to be higher than the height of the other side plate 14. When the cover 6 is attached to the casing 5, the top surface of the casing 5 is covered with the top plate 12, and one side plate 13 covers one side surface of the casing 5 (that is, the surface on which the plurality of support plates 9 are provided). ) Is covered. The cover 6 is made of a thin plate made of a metal material such as aluminum or iron in consideration of heat dissipation and durability.

  The casing 5 described above accommodates the condenser lens 16, the plurality of light source units 17, and the plurality of light control units 18. The condenser lens 16 is formed in a cylindrical shape, and a convex lens surface 19 is formed on the exit side. Further, a pair of support pieces 20 extending outward in the left and right directions are provided on both sides of the condenser lens 16. The pair of support pieces 20 are mounted on the opening upper edge portion of the casing 5 (specifically, the upper end portions of the side plate 8 and the plurality of support plates 9) when the condenser lens 16 is accommodated in the casing 5. Placed. Further, the convex lens surface 19 of the condenser lens 16 is somewhat protruded to the outside through the irradiation window 15 of the cover 6.

The light source unit 17 includes a printed wiring board 21 (first printed wiring board) and a plurality of LEDs 22 mounted on the printed wiring board 21 in a straight line. LED22 is comprised from high-intensity type power LED. The printed wiring board 21 is made of aluminum. The printed wiring board 21 of each light source unit 17 is attached adjacent to the inner surface of the bottom plate 7 of the casing 5 (see FIG. 5B). Thereby, several LED22 of the linear light source part 2 is arrange | positioned linearly as a whole. The heat from the LED 22 is transmitted to the bottom plate 7 of the casing 5 via the printed wiring board 21 and is radiated to the outside of the casing 5 by the radiating fin group 11.

  A pair of printed wiring boards 21 adjacent to each other are electrically connected via a pair of power supply wirings 23 (see FIG. 3). A pair of power supply wires 24 extending from the printed circuit board 21 on the most upstream side (the rightmost side in FIG. 5B) penetrates the end plate 10 of the casing 5 and supplies power to the power supply means 37 (FIG. 6). Is electrically connected). Thereby, the plurality of LEDs 22 of each light source unit 17 are electrically connected in parallel to the power supply means 37. When the driving power from the power supply means 37 is supplied to each light source unit 17 through the pair of power supply wires 23 and 24, the LEDs 22 of each light source unit 17 are turned on.

The light control unit 18 is provided corresponding to each light source unit 17. The light control unit 18 includes a printed wiring board 25 (second printed wiring board) and a plurality of electronic components 26 mounted on the printed wiring board 25. The plurality of electronic components 26 constitute a light control circuit 27 (see FIG. 6) for adjusting the amount of light from the LED 22. The printed wiring board 25 of each dimming unit 18 is attached adjacent to the inner surface of the side plate 8 of the casing 5. The printed wiring board 21 of the light source unit 17 and the printed wiring board 25 of the dimming unit 18 corresponding thereto are electrically connected via a connection wiring 28. The printed wiring boards 25 adjacent to each other are electrically connected via a control wiring 29. The control wiring 30 extending from the most upstream printed wiring board 25 passes through the end plate 10 of the casing 5 and is electrically connected to the dimming signal output means 40 (see FIG. 6) of the power supply control unit 3. . As a result, the printed wiring board 25 of each dimming unit 18 is connected to the dimming signal output means 40 via a plurality of control wires 29 in a daisy chain, and the dimming circuit 27 of each dimming unit 18 is The dimming signal output means 40 is electrically connected in parallel. The pair of power supply wires 24 and control wires 30 described above are housed in a bundled state inside the cable 4.

  The power supply control unit 3 has a housing 31, and a light control unit selection switch 33 (which constitutes a dimming unit selection unit), a light amount setting switch 34 (which constitutes a light amount setting unit), and a front panel of the housing 31, A display panel 35 and a power switch 36 are provided (see FIG. 1). The dimming unit selection switch 33 is for selecting a specific dimming unit 18 corresponding to the light source unit 17 whose light amount is to be adjusted among the plurality of dimming units 18. The light amount setting switch 34 is for setting the light amount of the light from the LED 22 for the selected specific light control unit 18. By operating the light amount setting switch 34, the light amount level is set in a range of 0 to 100, for example. The display panel 35 digitally displays the unit number (for example, “CH1”) of the dimming unit 18 selected by the dimming unit selection switch 33, the light amount level (for example, “50”) set by the light amount setting switch 34, and the like. Is displayed.

  The housing 31 includes a power supply means 37 and a controller 38 (see FIG. 6). The power supply means 37 supplies drive power (for example, 24V DC power) to the LEDs 22 of the light source units 17 via the pair of power supply wires 23 and 24. When the power switch 36 is turned on, the drive power from the power supply means 37 is supplied to the LEDs 22 of each light source unit 17, and when the power switch 36 is turned off, the supply of drive power from the power supply means 37 is cut off. .

  The controller 38 includes a dimming signal generation unit 39 and a dimming signal output unit 40. The dimming signal generation unit 39 generates a dimming signal corresponding to the light amount set by the light amount setting switch 34. This dimming signal is composed of, for example, a DC voltage signal of 0 to 5V. When the set light amount is the maximum value (for example, the light amount level is 100), the dimming signal is 5V, and the set light amount is the minimum value (for example, When the light level is 0), the dimming signal is 0V. The dimming signal output means 40 outputs the dimming signal to the dimming circuit 27 of the specific dimming unit 18 via the control wirings 29 and 30.

  Next, dimming of the LED 22 by the linear illumination device 1 of the present embodiment will be described. When the power switch 36 is turned on, the driving power from the power supply means 37 is supplied to the LEDs 22 of each light source unit 17, and the LEDs 22 are turned on. In this initial state, the dimming signal generating unit 39 generates a dimming signal (2.5 V) corresponding to the light amount level 50, for example, and the dimming signal output unit 40 outputs the dimming signal to each dimming unit 18. To the light control circuit 27. As a result, the LEDs 22 of each light source unit 17 are lit with a light amount of a light amount level 50. The light emitted from the LED 22 is converged and irradiated on the irradiation surface 32 by the condenser lens 16 (see FIG. 5A).

  For example, as indicated by the alternate long and short dash line in FIG. 5A, when the illuminance at both ends in the longitudinal direction of the irradiation surface 32 is low, dimming is performed as follows. First, the dimming unit selection switch 33 is operated to select the most upstream dimming unit 18, and the light amount setting switch 34 is operated to increase the light amount level from 50 to 70, for example. Thereby, the dimming signal generation unit 39 generates a dimming signal corresponding to the light amount level 70, and the dimming signal output unit 40 uses the dimming signal to the dimming circuit 27 of the most upstream dimming unit 18. Output to.

  Next, the dimming unit selection switch 33 is operated to select the dimming unit 18 on the most downstream side (leftmost in FIG. 5B), and the light amount setting switch 34 is operated to change the light amount level from 50 to 70, for example. Raise. As a result, the dimming signal generating unit 39 generates a dimming signal corresponding to the light amount level 70, and the dimming signal output unit 40 uses the dimming signal to the dimming circuit 27 of the dimming unit 18 on the most downstream side. Output to.

  In this way, the LED 22 of the most upstream light source unit 17 and the LED 22 of the most downstream light source unit 17 are each lit with a light amount of a light amount level 70, and the LEDs 22 of the middle two light source units 17 are respectively light amounts of a light amount level 50. Illuminated. Thereby, as shown with the continuous line in Fig.5 (a), the illumination intensity in the both ends of the longitudinal direction of the irradiation surface 32 is raised. Therefore, in the linear illumination device 1 of this embodiment, the uniformity of the light quantity in the longitudinal direction of the linear light source unit 2 can be ensured.

  As mentioned above, although one Embodiment of the linear illuminating device according to this invention was described, this invention is not limited to this Embodiment, A various deformation | transformation thru | or correction | amendment are possible without deviating from the scope of the present invention. .

  In the above-described embodiment, the case where the illuminance at both ends in the longitudinal direction of the irradiation surface 32 is low has been described. The dimming unit selection switch 33 is operated to select the two middle dimming units 18 respectively, and the light quantity of the LEDs 22 of the two middle dimming units 18 may be increased.

  In the above embodiment, four light source units 17 and four light control units 18 are used. However, the number of the light source units 17 and the light control units 18 can be set as appropriate according to the application of the linear illumination device 1 or the like. Thereby, the linear light source part 2 which has various length can be manufactured easily.

  Moreover, in the said embodiment, although LED22 was comprised from chip-type power LED, you may comprise from bullet-type LED.

  Moreover, in the said embodiment, although comprised so that the cylindrical condensing lens 16 might be accommodated in the casing 5, it replaced with this condensing lens 16, and it comprised so that a Fresnel lens, a translucent board, etc. might be accommodated. Also good.

DESCRIPTION OF SYMBOLS 1 Linear illuminating device 2 Linear light source part 3 Power supply control part 17 Light source unit 18 Light control unit 22 LED
25 Printed wiring board 27 Dimming circuit 29, 30 Control wiring 33 Dimming unit selection switch 34 Light quantity setting switch 39 Dimming signal generating means 40 Dimming signal output signal

Claims (2)

In a linear illumination device comprising: a linear light source unit; and a power source control unit that is connected to the linear light source unit with a cable and controls lighting of the linear light source unit.
The linear light source unit includes a light source unit in which a plurality of LEDs are linearly arranged on a first printed wiring board, and a dimming circuit for adjusting the amount of light from the plurality of LEDs of the light source unit. A dimming unit provided on the wiring board,
Further, the linear light source unit includes a plurality of the light source units arranged side by side in a predetermined direction in a casing constituting the linear light source unit, and all of the plurality of LEDs of each light source unit are arranged in the predetermined direction. On the other hand, the same number of light control units as the light source units are arranged in the casing in the predetermined direction, and the light source units and the first prints of the light control units corresponding to each other are arranged. The wiring board and the second printed wiring board are electrically connected via the connection wiring,
Each second printed wiring board of the plurality of light control units is connected in a daisy chain to the power supply control unit via a plurality of control wires,
A pair of first printed wiring boards adjacent to each other among the first printed wiring boards of the light source unit are connected to each other through a power wiring, and the first printed wiring board on the most upstream side is connected to the power source through the cable. Connected to the control unit,
The power control unit supplies driving power to each of the plurality of light source units via the cable and the power supply wiring, and the light control unit supplies each of the light control units via the plurality of control wirings. A linear illumination device characterized in that the optical circuit is independently driven and controlled. The power control unit includes: a dimming unit selecting unit that selects a specific dimming unit among the plurality of dimming units; and a light control unit that selects light from the plurality of LEDs of the light source unit corresponding to the specific dimming unit. A light amount setting means for setting the light amount; a light control signal generating means for generating a light control signal corresponding to the set light amount; and a light control signal for outputting the light control signal to the light control circuit of the specific light control unit. Optical signal output means, and
2. The linear illumination device according to claim 1, wherein the dimming signal from the dimming signal output unit is output to the dimming circuit of the specific dimming unit via the control wiring. .

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