JP2006162456A - Straight tube type light source for line illumination - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive and high-illuminance light source lamp for line illumination having high illuminance to bodies to be inspected and objects and capable of implementing line illumination by visible or ultraviolet light without having to depend on a conventional line light guide using fibers. <P>SOLUTION: The circumference inner surface of a cylindrical straight tube 1 is alternately provided with a reflective light shielding part 3 and a light transmitting part 4 of a prescribed width by dividing the circumference of the straight tube 1 by approximately 60° and differently applying a light reflective coating. A fluorescent coating is applied to the overall circumferential inner surface of the straight tube 1 from above the light shielding layer 3 to provide a fluorescent luminous layer 2. Light in two directions among light in three directions emergent from the light transmitting part 4 is condensed in a line form by an elliptical reflector, and light in the other direction is condensed in a line form by a condensing lens to condense light in the three directions into one line-like luminous flux. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a line illumination used for linear line illumination of an inspection apparatus, an imaging apparatus, etc. in a straight tube light source lamp such as a fluorescent lamp for visible light illumination such as a white light and a fluorescent lamp for ultraviolet light illumination such as a black light. The present invention relates to a straight tube light source lamp.

  As a line light source (bright line light source) used for line illumination for irradiating an article with linear illumination light in inspection or photographing of various articles using an inspection apparatus or an imaging apparatus, a straight tube type white has been conventionally used. Fluorescent lamps for visible light illumination such as lights and black light for straight tube ultraviolet light illumination are used as the most affordable light sources that generate diffuse light that does not have a predetermined directionality (isotropic) It has been.

  However, it is a line light source used for such line illumination (linear illumination) and has a predetermined directionality (anisotropy) that is not diffused light, for example, parallel light (that is, directed toward an object to be inspected). When light in a direction is required, the amount of illumination light is insufficient. To compensate for the insufficient light amount, a fiber (line) light guide and a plate light guide are used. It is common to use a linear light source.

  Further, if only the shortage of light quantity is compensated, it is possible to obtain some light quantity using a reflector or the like, but the effect of supplementing the light quantity is not doubled.

Known patent documents relating to the technology of the present invention are described below.
JP-A-9-244158 JP 2003-232747 A

  When the line light source needs to illuminate with parallel light, a line-shaped light guide using a fiber is used as before, and imaging is performed by directing parallel light toward the subject. Further, when the amount of light is insufficient (when the photographing speed is high), the shortage can be covered by increasing the amount of light of the original light source.

  However, in order to increase the amount of light, the number of light sources increases, the price of the line light guide itself is expensive, and if a straight line type fluorescent lamp is used to perform line parallel light illumination In the case of a fluorescent lamp, most of the light is diffuse light and scattered in the entire circumferential direction of the circular cross section of the straight tube type fluorescent lamp, and only a small part of the light beam irradiates the subject.

  Further, even if it is attempted to increase the amount of light using a reflector or the like, there is a lot of scattered light, and the parallel light coming from the reflection is disturbed by the fluorescent lamp itself and does not hit the subject efficiently. An object of the present invention is to eliminate the above inconvenience.

The invention according to claim 1 of the present invention is a straight tube type light source lamp having electrodes at both ends of a cylindrical straight tube made of transparent glass and a fluorescent light emitting layer on the inner surface of the straight tube. A reflective light-shielding portion 3 and a translucent portion 4 having a predetermined width are alternately provided by applying a light-reflective light-shielding material to the inner circumferential surface of the straight tube 1 at intervals of about 60 ° of the circumference of the straight tube 1. The fluorescent light emitting layer 2 is provided by applying a fluorescent paint from above the light shielding layer 3 on the entire inner surface of the circumference 1, and two directions of light emitted from the light transmitting portion 4 are transmitted by the elliptical reflector 5. Line illumination characterized by condensing light in one line and condensing light in the other direction in a line shape by a light collecting lens and condensing the light in the three directions as one light beam in a line shape This is a straight tube light source lamp.

  The invention according to claim 2 of the present invention is a straight tube type light source lamp having electrodes at both ends of a cylindrical straight tube made of transparent glass and a fluorescent light emitting layer on the inner surface of the straight tube. An ultraviolet light transmitting film layer 7 having a spectral transmittance peak in the ultraviolet light region is provided on the entire inner surface of the outer circumference of the tube, and the circumference of the straight pipe 1 is about 60 ° on the inner circumferential surface side of the ultraviolet light transmitting film layer 7. By applying a light-reflective light-shielding material in each division, a reflective light-shielding part 3 and a light-transmitting part 4 having a predetermined width are alternately provided, and the fluorescent paint is applied to the entire inner surface of the straight pipe 1 from above the light-shielding layer 3. The fluorescent light emitting layer 2 is applied and the light in two directions out of the three directions emitted from the light transmitting portion 4 is collected in a line by the elliptical reflector 5 to collect the light in the other direction. A straight tube light source lamp for line illumination, wherein the light is condensed in a line by a lens, and the light in the three directions is condensed as a light beam in one line.

  According to the straight tube type light source lamp for line illumination of the present invention, a light-reflective light-shielding material is applied to the inner circumferential surface of the glass cylindrical straight tube 1 at intervals of about 60 ° in the circumference of the straight tube 1. The reflective light-shielding portions 3 and the light-transmitting portions 4 having a predetermined width are alternately provided, and the fluorescent light-emitting layer 2 is provided on the entire inner circumferential surface of the straight pipe 1 by applying a fluorescent paint from the light-shielding layer 3. It is a light source lamp, and the light in two directions among the light in the three directions emitted from the three light transmitting portions 4 at every 120 ° is condensed in a line by the elliptical reflector (or reflecting mirror) 5. Since the light in the other direction is condensed in a line shape by the light collecting lens and the light in the three directions is condensed as a light beam in one line shape, the light emitted from the fluorescent light emitting layer 2 Does not scatter in the 360 ° direction of the entire circumference of the cylindrical straight tube 1, but efficiently emits light in three directions emitted from the three light transmitting portions 4 at every 120 ° with good optical gain. It can be condensed as a single line-shaped light beam, and can realize line illumination with visible light or ultraviolet light with high illuminance on the object to be inspected or subject, using fiber An inexpensive light source lamp for line illumination can be provided without depending on a conventional line light guide.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  FIG. 1 shows an embodiment of a straight tube light source lamp A for line illumination according to the present invention, and is a side view of an illumination optical system. FIG. 2 shows a straight tube light source lamp A for line illumination according to the present invention. FIG. 3 is a side view of an illumination optical system according to another embodiment, and FIG. 3 shows a case where the straight tube light source lamp A for line illumination according to the present invention is arranged as a light source lamp for line illumination of the inspection means B of the inspection apparatus. FIG.

  As shown in FIG. 1, a straight tube type light source lamp A for line illumination according to the present invention has a filament counter electrode portion for lighting at both ends (both ends in the front and back direction of the drawing) of a cylindrical straight tube 1 made of transparent glass. 8 and 8 and a sealing cap (see FIG. 3), the straight tube 1 is provided with a fluorescent light emitting layer on the inner surface, and the straight tube 1 is filled with argon gas and mercury vapor gas. Type light source lamp.

  On the inner circumferential surface of the cylindrical straight pipe 1, for example, a light-reflective and light-shielding paint such as a white paint having a concealing property or a white ink is divided at intervals of about 60 ° in the transverse direction of the straight pipe 1. The reflective light-shielding portions 3 and the light-transmitting portions 4 having a predetermined width are alternately provided by coating them separately (or by forming a metal vapor deposition film such as concealing aluminum). 3 and the translucent part 4 are formed every 120 °.

A fluorescent paint (a mixture of fluorescent dyes in a binder resin (paint)) is applied on the light-shielding layer 3 over the entire inner surface of the cylindrical straight tube 1 to provide a fluorescent light-emitting layer 2. Then, by applying a predetermined voltage to the straight tube 1 from the counter electrode portions 8 and 8 at both ends of the straight tube 1 shown in FIG. 3, the fluorescent light emitting layer 2 emits fluorescence. In addition, the inner surface of the cylindrical straight tube 1 may be a smooth surface or may exhibit a fine uneven light diffusing surface.

  As shown in FIG. 1, the straight tube light source lamp A for line illumination of the present invention illuminates at least one light transmitting portion 4 among three light transmitting portions 4 formed every 120 °. It faces the object to be inspected C (or subject) and faces in the Z direction.

  The straight tube light source lamp A for line illumination according to the present invention emits fluorescence by the fluorescent light emitting layer 2 provided on the entire inner peripheral surface of the straight tube 1 by applying a predetermined voltage, and the outside of the straight tube 1 In addition, the fluorescence L1, L2, and L3 are emitted directly from the three light transmitting portions 4, and the fluorescence emitted from the fluorescent light emitting layer 2 on the three reflective light shielding portions 3 is also emitted to the outside of the straight tube 1. Fluorescence L1, L2, and L3 are emitted directly from the three light-transmitting portions 4, and reflected by the reflective light-shielding portion 3, and then emitted from the three light-transmitting portions 4 to the outside of the straight tube 1. , L3 is emitted.

  As shown in FIG. 1, among the three directions of fluorescence L1, L2, and L3 emitted from the three light transmitting portions 4 of the straight line light source lamp A for line illumination of the present invention, the two directions of fluorescence L1 and L2 are A semi-elliptical elliptical reflector 5 (or an elliptical reflector) reflects the inner surface of the reflector 5 so that a line is formed with a predetermined line illumination width in the Y direction of the surface of the object C (or subject). The light L3 in the other direction is condensed in a line shape with a predetermined line illumination width in the Y direction of the surface of the object C (or subject) by the light collecting lens 6. The light L, L2, L3 in the three directions is condensed on the surface of the inspected object C (or the subject) as one line-shaped condensed light beam L having a predetermined width in the Y direction, and a linear line in the Y direction. Lighting is performed.

  As another embodiment of the straight tube type light source lamp A for line illumination of the present invention, as shown in FIG. 2, a peak of spectral transmittance in the ultraviolet region is formed on the entire inner surface of the cylindrical straight tube 1. An ultraviolet light transmitting film layer 7 is provided, and a light-reflective coating is separately applied to the inner surface of the circumferential surface of the ultraviolet light transmitting film layer 7 at intervals of about 60 ° in the circumference of the straight pipe 1. The reflective light-shielding portions 3 and the light-transmitting portions 4 having a predetermined width are alternately provided, and a fluorescent paint is applied to the entire inner circumferential surface of the straight pipe 1 from above the light-shielding layer 3. The fluorescent light emitting layer 2 is provided.

  The straight tube light source lamp A for line illumination according to the present invention emits fluorescence by the fluorescent light emitting layer 2 provided on the entire inner peripheral surface of the straight tube 1 by applying a predetermined voltage. On the other hand, ultraviolet light L1, L2, and L3 are emitted directly from the three light transmitting portions 4 through the ultraviolet light transmitting film layer 7 and emitted from the fluorescent light emitting layer 2 on the three reflective light shielding portions 3. The emitted fluorescence also emits ultraviolet light L 1, L 2, L 3 directly from the three light transmitting portions 4 to the outside of the straight tube 1, and is reflected by the reflective light shielding portion 3 to be reflected at the three light transmitting portions 4. Ultraviolet light L1, L2, L3 is emitted from the straight pipe 1 to the outside.

  As shown in FIG. 2, among the three directions of ultraviolet light L1, L2, L3 emitted from the three light transmitting portions 4 of the straight line light source lamp A for line illumination according to the present invention, two directions of ultraviolet light L1, L2 is condensed in a line shape in the Y direction on the surface of the inspection object C (or subject) by the elliptical reflector 5, and the ultraviolet light L3 in the other direction is collected by the collecting lens 6 to the inspection object C ( (Or subject) is condensed in a line shape in the Y direction of the surface, and the ultraviolet light L, L2, L3 in the three directions is converted into a single line-shaped condensed ultraviolet light beam L having a predetermined width in the Y direction. The light is condensed on the (or subject) surface and linear line illumination in the Y direction is performed.

  As shown in FIG. 3, for example, the straight tube light source lamp A for line illumination according to the present invention is a line in the Y direction of inspection means B such as a linear (line type) or area type CCD camera 9 of an inspection apparatus. Used as a light source for illumination.

  The inspection means B of the inspection apparatus sets a predetermined inspection surface of an inspection object C (or subject) such as a print sheet as an inspection position by the inspection means (a subject distance equivalent portion to which the CCD camera 9 is focused), and prints. While the inspection object C (or the subject) such as a sheet is fed, the state (foreign matter, defect, etc.) of the inspection object C is inspected while the inspection object C is photographed by the CCD camera 9 or the like.

  As shown in FIG. 3, the light source lamp A of the present invention aligns the condensed light beam L in the Y direction at the inspection position (corresponding to the subject distance in focus of the CCD camera 9) by the inspection means of the inspection apparatus. Line illumination is performed to inspect the state of the inspected object C.

  As shown in FIGS. 1 and 2, the light source lamp A of the present invention is disposed at a position centered on a focal point f1 closer to the reflecting plate 5 out of the two elliptical focal points f1 and f2 of the elliptical reflecting plate 5. The fluorescent light L1 and L2 from the two light-transmitting portions 4 and 4 oriented in the direction of the reflecting plate 5 of the light source lamp A are reflected by the reflecting surface of the reflecting plate 5 (the inner surface of the elliptically reflecting plate). 5 is focused on another focal point f2.

  Further, the fluorescent light L3 directed in the opposite direction to the reflecting plate 5 is condensed by the light collecting lens 6 and condensed at another focal point f2 of the elliptical reflecting plate 5 which is the same as the focal point f2 of the fluorescent light L1 and L2. To do. At this time, the characteristics of the lens 6 are combined so as to focus on the focal point f2 of the fluorescent light L1 and L2 of the elliptical reflector 5. Note that the line illumination width of the condensed light beam L by the fluorescence L1, L2, and L3 with respect to the surface of the object C (or subject) is different from that of the other focal point f2 of the elliptical reflector 5 and the surface of the object C (or object). By adjusting the separation distance, it can be changed as appropriate.

  By doing so, most of the radial parallel light (fluorescence) emitted from the light source lamp A of the present invention passes through the elliptical reflector 5 and the light collecting lens 6 as a condensed light beam L by the fluorescence L1, L2, and L3. When the subject C is imaged using this line with a predetermined line illumination width, a brighter image can be obtained than when imaged with ordinary fluorescent light.

The outline side view explaining one embodiment of the straight tube type light source lamp for line lighting of the present invention. The outline side view explaining other embodiments of the straight tube type light source lamp for line lighting of the present invention. The whole perspective view explaining an example of the inspection apparatus (or imaging device) using the straight tube type light source lamp for line illumination of the present invention.

Explanation of symbols

A ... Straight tube light source lamp for line illumination B ... Inspection device (imaging device)
C ... Subject (subject)
L ... Condensed light flux L1, L2, L3 ... Fluorescence f1 ... First focus f2 ... Second focus 1 ... Glass cylindrical straight tube 2 ... Fluorescent light emitting layer 3 ... Reflective light shielding layer 4 ... Translucent portion 5 ... Ellipse Reflector 6 ... light collecting lens 7 ... ultraviolet light transmitting layer 8 ... counter electrode 9 ... inspecting means

Claims (2)

  In a straight tube type light source lamp provided with electrodes on both ends of a cylindrical straight tube made of transparent glass and having a fluorescent light emitting layer on the inner surface of the straight tube, the straight tube 1 is provided on the circumferential inner surface of the cylindrical straight tube 1. A light-reflective light-shielding material is applied in a division of about 60 ° in the circumference to alternately provide a light-reflective light-shielding portion 3 and a light-transmitting portion 4 having a predetermined width. A fluorescent paint is applied from above the layer 3 to provide the fluorescent light emitting layer 2. Of the three directions of light emitted from the light transmitting part 4, the light in two directions is condensed into a line shape by the elliptical reflector 5. A straight tube light source lamp for line illumination, wherein light in a direction is condensed in a line shape by a light collecting lens, and the light in the three directions is condensed as one line-shaped light beam.   In a straight tube type light source lamp having electrodes on both ends of a cylindrical straight tube made of transparent glass and a fluorescent light emitting layer on the inner surface of the straight tube, the entire surface of the circumferential inner surface of the cylindrical straight tube 1 is in the ultraviolet region. An ultraviolet light transmitting film layer 7 having a peak of spectral transmittance is provided, and a light-reflective light-shielding material is divided on the circumferential inner surface side of the ultraviolet light transmitting film layer 7 at intervals of about 60 ° in the circumference of the straight tube 1. The reflective light-shielding portions 3 and the light-transmitting portions 4 having a predetermined width are alternately applied, and a fluorescent paint is applied to the entire inner circumferential surface of the straight tube 1 from above the light-shielding layer 3 to form the fluorescent light-emitting layer 2. Provided, light in two directions out of the light in three directions emitted from the light transmitting portion 4 is condensed in a line shape by the elliptical reflector 5 and the light in the other direction is condensed in a line shape by the light collecting lens. A straight tube light source lamp for line illumination, wherein the light in the three directions is condensed as one line-shaped light beam.

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