JP2022036349A - Oled lighting module, oled lighting device, and lighting imaging system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an OLED lighting module, an OLED lighting device and an illumination imaging system which can be made smaller and less likely to have shadows.
An OLED lighting module ML of the present invention is formed on a first surface SFa and a columnar member 1 including a first surface SFa and a second surface SFb intersecting the first surface SFa at a predetermined angle. The columnar member 1 is provided with an OLED light emitting unit 2 and a semitransparent mirror 3 formed on the second surface SFb, which reflects a part of the light radiated from the OLED light emitting unit 2 and transmits the remaining light. It is made of a material that is transparent to the wavelength of the light emitted from the OLED light emitting unit 2.
[Selection diagram] Fig. 2

Description

The present invention relates to an OLED lighting module using an OLED, an OLED lighting device including a plurality of the OLED lighting modules, and a lighting imaging system including the OLED lighting module or the OLED lighting device.

In the human vision of seeing an object with the naked eye and the man vision of seeing (imaging) an object with an image sensor in which multiple photoelectric conversion elements are arranged in a one-dimensional or two-dimensional array, in order to properly see the object. In addition, the object is usually illuminated by a lighting device. At this time, it may be desired to irradiate the object with the illumination light coaxially with the line of sight of the naked eye or the optical axis of the camera.

As a lighting device used in such a case, there is a group (plural types) of lighting devices called LFV3 series manufactured by CCS Co., Ltd. disclosed in Non-Patent Document 1. As shown in FIG. 4, the LFV3 series lighting device 1000 disclosed in Non-Patent Document 1 includes a beam splitter 1001, a diffuser plate 1002, a plurality of light emitting diodes (LEDs) 1003, an antireflection material 1006, and the like. A reflective film 1007 and a rectangular housing 1004 that accommodates the antireflection material 1006, the beam splitter 1001, the diffuser plate 1002, the reflective film 1007, and a plurality of LEDs 1003 in this order are provided. The plurality of LEDs 1003 are arranged so as to be juxtaposed on the inner wall surface on one side of the housing 1004. The diffuser plate 1002 has the light emission surface so that the first normal line of the light emission surface formed by the plurality of LEDs 1003 and the second normal line of the diffusion plate coincide with each other (so that they are parallel to each other). It is arranged in the housing 1004 at a distance from the housing 1004 by a predetermined distance. The reflective film 1007 is attached on the upper, lower, left, and right side walls of the housing 1004 so as to surround the space between the plurality of LEDs 1003 and the diffuser plate 1002. The beam splitter 1001 includes a main body member 1001a having an isosceles right triangle columnar shape and a half mirror 1001b provided on the slope of the main body member 1001a. The antireflection material 1006 is arranged between the beam splitter 1001 and the inner wall surface on the other side of the housing 1004. On the other side of the housing 1004, first and second through openings 1005a and 1005b are formed on the upper surface wall and the lower surface wall facing each other, respectively, and the beam splitter 1001 is provided with a half mirror 1001b at this location. Each of the other surfaces that are not split is abutted against the inner surface of the side wall and the inner surface of the upper surface wall on the other side of the housing 1004, the main body member 1001a can be seen from the outside through the first through opening 1005a, and the half mirror 1001b can be seen from the second through opening 1005b. It is arranged so that it can be seen from the outside. One end of the half mirror 1001b and one end of the diffuser plate 1002, which are close to the upper surface wall of the housing 1004, are arranged apart by a predetermined distance SL without intersecting each other. In machine vision, the LFV3 series lighting device 1000 having such a configuration is arranged between the work WK of the object and the camera CA, and the camera CA sees and images the work WK via the beam splitter 1001. Can be done. At this time, the light radiated by the plurality of LEDs 1003 is diffused by the reflective film 1007 and the diffuser plate 1002, becomes substantially uniform illumination light, and is incident on the half mirror 1001b. A part of this substantially uniform illumination light is reflected by the half mirror 1001b toward the work WK along the optical axis direction of the camera CA, and the rest passes as it is. As a result, the illumination light is applied to the work WK of the object coaxially with the optical axis of the camera CA. In Human Vision, the naked eye replaces the camera CA.

"LFV3 series", CCS Inc., [Search on September 3, 2018], Internet (URL; https: //www.ccs-inc.co.jp/products/series/150

By the way, if the light from the plurality of LEDs 1003 is irradiated through the beam splitter 1001, the work WK cannot be illuminated with a uniform amount of light. Therefore, the lighting device 1000 includes the reflective film 1007 and the diffuser plate 1002, but in order to illuminate the work WK with a substantially uniform amount of light, it is appropriate between the plurality of LEDs 1003 and the diffuser plate 1002. It is necessary to set a distance. Therefore, in the configuration of the lighting device 1000, it is difficult to further reduce the size.

Further, in the lighting device 1000, a portion separated by the above-mentioned distance SL may be reflected on the work WK as a shadow. In particular, when the work WK is a member made of a metal material, the surface thereof is often a mirror surface, and the portion of the distance SL reflected on the surface becomes conspicuous.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an OLED lighting module, an OLED lighting device, and a lighting imaging system that can be made smaller and are less likely to have shadows.

As a result of various studies, the present inventor has found that the above object can be achieved by the following invention. That is, the OLED lighting module according to one aspect of the present invention includes a columnar member including a first surface, a second surface that intersects the first surface at a predetermined angle, and an OLED formed on the first surface. The columnar member includes a light emitting portion and a semi-translucent mirror formed on the second surface, which reflects a part of the light radiated from the OLED light emitting portion and transmits the remaining light, and the columnar member is the OLED light emitting portion. It is made of a material that is transparent to the wavelength of light emitted from. Preferably, in the above-mentioned OLED lighting module, the columnar member has a triangular prismatic shape having the predetermined angle of 45 degrees.

In such an OLED lighting module, since the OLED light emitting portion capable of surface emission is formed on the first surface of the columnar member, the reflective film and the diffuser can be omitted in the OLED lighting module. Therefore, since the above-mentioned event caused by the diffuser does not occur, the OLED lighting module can be made smaller and the shadow is less likely to be formed.

The OLED lighting device according to another aspect of the present invention includes a plurality of the above-mentioned OLED lighting modules, and the plurality of OLED lighting modules emit light emitted from each OLED light emitting unit in the same direction. Is located in. Preferably, in the above-mentioned OLED lighting module, the columnar member has a quadrangular prism shape having the predetermined angle of 45 degrees. Preferably, in the above-mentioned OLED lighting device, the plurality of OLED lighting modules are emitted by each OLED light emitting unit by sequentially connecting each columnar member in a row so that the reflection directions of the semitransparent mirrors are aligned. The lights are arranged so as to be aligned and emitted in the same direction. Preferably, in the above-mentioned OLED lighting device, each OLED light emitting unit in the plurality of OLED lighting modules emits light of the same color from the viewpoint of increasing the intensity of light radiated from the OLED lighting device. Preferably, in the above-mentioned OLED lighting device, each OLED light emitting unit in the plurality of OLED lighting modules emits light of a different color from the viewpoint of radiating light of a desired color from the OLED lighting device.

According to this, it is possible to provide an OLED lighting device including a plurality of OLED lighting modules. Since the OLED lighting device includes a plurality of OLED lighting modules, the reflective film and the diffuser can be omitted in the OLED lighting device. Therefore, since the above-mentioned event caused by the diffuser does not occur, it is difficult for the above-mentioned OLED lighting device to form the above-mentioned shadow. Since the OLED lighting device includes a plurality of OLED lighting modules, it is possible to increase the amount of the illuminating light, irradiate the illuminating light of a plurality of colors, irradiate the illuminating light of a composite color, and the like.

In another aspect, in the above-mentioned OLED lighting device, the plurality of OLED lighting modules are arranged so that the light emission efficiency of the OLED light emitting unit becomes smaller as it is closer to the light radiation surface of the OLED lighting device. In other words, the plurality of OLED lighting modules are arranged so that the light radiation efficiency of the OLED light emitting unit increases as the distance from the light radiation surface of the OLED lighting device increases. Preferably, in the above-mentioned OLED lighting device, the plurality of OLED lighting modules are three first to third OLED lighting modules, and the first OLED light emitting unit of the first OLED lighting module emits green light. The second OLED light emitting unit of the second OLED lighting module emits red light, the third OLED light emitting unit of the third OLED lighting module emits blue light, and the first to third OLED lighting modules emit the OLED. The third OLED lighting module, the second OLED lighting module, and the first OLED lighting module are arranged in this order from the light emitting surface of the lighting device.

The light emitted from the OLED lighting module located farther from the light emitting surface of the OLED lighting device must pass through more translucent mirrors. In the OLED lighting device, the light emission efficiency of the OLED light emitting unit becomes smaller as each OLED lighting module is closer to the light emission surface of the OLED lighting device. In other words, each OLED lighting module is the light of the OLED lighting device. It is arranged so that the farther from the radiation surface, the higher the light emission efficiency of the OLED light emitting unit. Therefore, the OLED lighting device can irradiate the light radiated from the OLED lighting module arranged at a position far from the light emitting surface of the OLED lighting device with a larger amount of light.

The illumination imaging system according to another aspect of the present invention is arranged so as to align the optical axis direction with the reflection direction of the semitransparent mirror with the above-mentioned OLED lighting module or any of the above-mentioned OLED lighting devices. It includes a semi-transparent mirror and an image pickup unit that captures an image of a subject via the columnar member.

According to this, it is possible to provide the above-mentioned OLED lighting module or an illumination imaging system including any of these above-mentioned OLED lighting devices. Since the lighting imaging system includes the above-mentioned OLED lighting module or any of the above-mentioned OLED lighting devices, the size can be further reduced and an image of the work without shadows can be generated.

The OLED lighting module according to the present invention can be made smaller and the shadow is less likely to be formed. According to the present invention, it is possible to provide an OLED lighting device including a plurality of the OLED lighting modules, and a lighting imaging system including the OLED lighting module or the OLED lighting device.

It is a figure for demonstrating the illumination imaging system in 1st Embodiment. It is a figure for demonstrating the OLED lighting module and auxiliary member used in the said lighting image pickup system. It is a figure for demonstrating the structure of the OLED lighting apparatus in 2nd Embodiment. As a prior art, it is a partial sectional view showing a schematic structure of LFV3-100 manufactured by CCS Co., Ltd.

Hereinafter, one or more embodiments of the present invention will be described with reference to the drawings. However, the scope of the invention is not limited to the disclosed embodiments. It should be noted that the configurations with the same reference numerals in the respective drawings indicate the same configurations, and the description thereof will be omitted as appropriate. In the present specification, when they are generically referred to, they are indicated by reference numerals without subscripts, and when they refer to individual configurations, they are indicated by reference numerals with subscripts.
(First Embodiment)
FIG. 1 is a diagram for explaining the illumination imaging system according to the first embodiment. 1A is a partial cross-sectional view showing the configuration of an illumination imaging system, and FIG. 1B is a cross-sectional perspective view of an OLED lighting device. In FIG. 1A, the OLED lighting device is a cross-sectional view. FIG. 2 is a diagram for explaining an OLED lighting module and an auxiliary member used in the lighting imaging system. FIG. 2A is an overall perspective view of each of the OLED lighting module and the auxiliary member, and FIG. 2B is a cross-sectional view showing the configuration of the OLED. In FIG. 2A, the OLED lighting module and the auxiliary member are shown in a separated state, the OLED lighting module is shown by a solid line, and the auxiliary member is shown by a two-dot chain line.

The illumination imaging system according to the first embodiment is a system that irradiates the work WK to be imaged with illumination light to image the work WK. For example, as shown in FIG. 1A, an image pickup device CA and an OLED lighting device LPa. And prepare.

The image pickup device CA is a device that takes an image of the work WK illuminated by the illumination light emitted from the OLED lighting device LPa via the OLED lighting device LPa. The image pickup apparatus CA is, for example, an imaging optical system that forms an optical image of a subject on a predetermined image plane, and is arranged so that a light receiving surface is aligned with the image plane, and the optical image of the subject is electrically formed. It is a digital camera or the like including an area image sensor that converts into a signal, an image processing circuit that generates image data that is data representing the image of the subject by image processing the output of the area image sensor, and the like. The image pickup apparatus CA outputs an image of the work WK (image data of the work WK) to a predetermined apparatus (not shown) according to the application. For example, in an inspection system that inspects a work WK, the image pickup device CA outputs an image of the work WK to a determination device that determines the presence or absence of a defect in the work WK based on the image of the work WK. The arrangement relationship between the image pickup device CA and the OLED lighting device LPa will be described later.

The OLED lighting device LPa is a lighting device using an OLED (Organic Light Emitting Diode). As shown in FIGS. 1A and 1B, the OLED lighting device LPa includes, for example, an OLED lighting module ML including a columnar member 1, an OLED light emitting unit 2 and a translucent mirror 3, an auxiliary member 4, a driving unit 5, and a housing. It includes a body HS and a cable LN.

The OLED lighting module ML is a device provided with an OLED and radiating light emitted by the OLED from a predetermined direction. For example, as described above, the columnar member 1, the OLED light emitting unit 2, and the semitransparent mirror 3 are provided. Provide (see FIGS. 1A and 2A).

The columnar member 1 is a columnar optical element including a first surface SFa and a second surface SFb intersecting the first surface SFa at a predetermined angle θ with respect to the wavelength of light emitted from the OLED light emitting unit 2. It is made of transparent material. More specifically, in the present embodiment, the columnar member 1 is provided with a triangular prism shape having the predetermined angle θ of 45 degrees, more specifically, a third surface SFc and both side surfaces (reference numerals omitted). It is a triangular prism-shaped member having an isosceles triangle with a right angle in cross section, and is connected in the order of the first surface SFa, the second surface SFb, and the third surface Sfc (the third surface Sfc is connected to the first surface SFa). Concatenated). That is, one end of the first surface SFa is connected to the other end of the second surface SFb, one end of the second surface SFb is connected to the other end of the third surface Sfc, and one end of the third surface Sfc is the first. It is connected to the other end of the surface SFa. The cross section of the first surface SFa and the third surface SFc forms the two sides of the right-angled isosceles triangle, and the cross section of the second surface SFb forms the hypotenuse of the right-angled isosceles triangle. Therefore, the angle formed by the first surface SFa and the third surface Sfc is 90 degrees, and the angle θ formed by the first surface SFa and the second surface SFb and the angle formed by the third surface Sfc and the second surface SFb are formed. It is 45 degrees, and the second surface SFb is a slope. The material of such a columnar member 1 is, for example, a resin (polycarbonate (PC), polymethylmethacrylate (PMMA), etc.), glass, or the like, but glass is preferable from the viewpoint of moisture resistance (waterproofness).

The OLED light emitting unit 2 is a layered (film-like) element formed on the first surface SFa of the columnar member 1 and emitting light by the OLED by the electric power supplied from the driving unit 5. The OLED light emitting unit 2 may have an arbitrary shape such as a polygonal shape or a circular shape in a plan view, but in the present embodiment, as shown in FIG. 2A, the OLED light emitting unit 2 has a rectangular shape in a plan view. The OLED light emitting unit 2 is provided with an organic light emitting layer between a pair of first and second electrodes, and when power is supplied to the first and second electrodes, electrons and holes in the organic light emitting layer are regenerated. It emits light by binding. More specifically, in one example, as shown in FIG. 2B, the OLED light emitting unit 2 is a transparent electrode 21 as the first electrode formed in a layer (film shape) on the first surface SFa of the columnar member 1. An organic light emitting layer 22 formed in a layered state (film shape) on the transparent electrode 21, a metal electrode 23 as the second electrode formed in a layered state (film shape) on the organic light emitting layer 22, and an external electrode. With the sealing layer 24 that seals the transparent electrode 21, the organic light emitting layer 22, and the metal electrode 23 in cooperation with the columnar member 1 so as to be able to energize each of the transparent electrode 21 and the metal electrode 23. To prepare for. In one example, the organic light emitting layer 22 is a hole injection layer (HIL: Hole Injection Layer) / hole transport layer (HTL: Hole Transfer Layer) / light emitting layer (EML: EMSive Layer) / electron transport layer (ETL: Electron Transferr). It is composed of a Rayer) / electron injection layer (EIL: Electron Injection Layer). In addition to the above, the organic light emitting layer 22 includes, for example, a light emitting layer / electron transporting layer, a hole transporting layer / light emitting layer / electron transporting layer, and a hole transporting layer / light emitting layer / positive. Those composed of hole blocking layer / electron transport layer, hole transport layer / light emitting layer / hole blocking layer / electron transport layer / buffer layer, buffer layer / hole transport layer / light emitting layer unit / Examples thereof include those composed of a hole blocking layer / an electron transporting layer / a buffer layer. In addition, in order to increase the amount of light, the organic light emitting layer 22 may be multi-layered.

The semi-transmissive mirror (half mirror) 3 is formed on the second surface SFb of the columnar member 1, reflects a part of the light radiated from the OLED light emitting unit 2, and has a layered (film-like) shape that transmits the remaining light. It is an optical element. The semitransparent mirror 3 is, for example, a metal thin film such as aluminum (Al), gold (Au), silver (Ag), platinum (Pt), and chromium (Cr). Since the semitransparent mirror 3 functions as described later, a high reflectance is preferable from the viewpoint of increasing the amount of illumination light, but the image pickup device CA captures the work WK via the semitransparent mirror 3. From the viewpoint of balancing illumination and imaging, the semitransparent mirror 3 is designed and created so that the transmittance and the reflectance with respect to the wavelength of the light emitted from the OLED light emitting unit 2 are 50% each. ..

In such an OLED lighting module ML, an OLED light emitting unit 2 is formed on the first surface SFa, a semitransparent mirror 3 is formed on the second surface SFb, and an angle θ formed by the first surface SFa and the second surface SFb. Is 45 degrees, the light emitted by the OLED light emitting unit 2 is incident on the columnar member 1 from the first surface SFa, reaches the second surface SFb, and a part of the light is transmitted to the third surface Sfc by the semitransparent mirror 3. It is reflected toward and radiated from the third surface SFc, and the rest of the light is transmitted through the semitransparent mirror 3.

The auxiliary member 4 protects the semitransparent mirror 3 of the OLED lighting module ML, and when the OLED lighting module ML is housed in the housing HS as described later, the space formed by the OLED lighting module ML and the housing HS is formed. It is a member for filling (filling, filling). More specifically, for example, the auxiliary member 4 has substantially the same shape as the columnar member 1 and is made of the same material, and in the present embodiment, the auxiliary member 4 is made of a material transparent to the wavelength of the light emitted from the OLED light emitting unit 2. It is a triangular prism-shaped member having an isosceles triangle with a right angle in cross section. In such an auxiliary member 4, the slope (second surface) FSe of the auxiliary member 4 is brought into contact with the semitransparent mirror 3, so that the columnar member 1 and the auxiliary member 4 have the semitransparent mirror 3 on each other's slopes FSb and FSe. It becomes a prism shape with a rectangular cross section sandwiched.

The drive unit 5 is a device that is electrically connected to each of the cable LN and the OLED light emitting unit 2 of the OLED lighting module ML, and drives the OLED light emitting unit 2 of the OLED lighting module ML to emit light. For example, the drive unit 5 drives the OLED light emitting unit 2 of the OLED lighting module ML by converting the electric power supplied by the cable LN into a predetermined current value and supplying power to the OLED light emitting unit 2 of the OLED lighting module ML. And make it emit light. The predetermined current value may be appropriately set in advance so that the OLED light emitting unit 2 emits light with a predetermined amount of light, or may be set according to a control signal received from the outside via the cable LN.

The housing HS is a member that houses the OLED lighting module ML, the auxiliary member 4, and the drive unit 5. The housing HS is, for example, a hollow box member having a substantially rectangular parallelepiped shape, and on one side thereof, a first surface wall WLa and a lower surface wall WLb facing each other have a predetermined size (area). And the second through openings APa and APb are formed, and the OLED lighting module ML and the auxiliary member 4 are arranged at this location. More specifically, the auxiliary member 1 sandwiching the semitransparent mirror 3 and the third surface Sfc of the columnar member 1 in the auxiliary member 4 face the outside from the second through opening APc and face the third surface Sfc of the columnar member 1. The second surface SFf of the member 4 faces the outside from the first through opening APa, and the first surface SFd of the auxiliary member 4 faces the first surface SFa of the columnar member 1, and the first surface SFd of the auxiliary member 4 faces the side wall on one side of the housing HS. The OLED lighting module ML and the auxiliary member 4 are arranged and housed in the one side of the housing HS so as to abut on the inner wall surface of the WLc. Then, the cable LN is inserted into the third through opening formed in the side wall WLd on the other side of the housing HS, and the OLED light emitting portion 2 formed on the inner wall surface of the side wall WLd and the first surface SFa of the columnar member 1. The drive unit 5 is arranged between (the first surface SFa of the columnar member 1 via the OLED light emitting unit 2) and is housed in the other side of the housing HS.

The OLED lighting device LPa having such a configuration is, for example, a predetermined first distance (first height) from the support CB so as to illuminate the work WK mounted on the support CB such as a mounting table or a transport belt. It is placed at a position separated by (). Then, with respect to the OLED lighting device LPa arranged in this way, the image pickup device CA aligns the optical axis direction of the image pickup device CA with the reflection direction of the semitransparent mirror 3 in the OLED lighting module ML of the OLED lighting device LPa. , Is arranged at a position separated from the OLED lighting device LPa by a predetermined second distance (second height). In the present embodiment, the light emitted by the OLED light emitting unit 2 propagates in the direction of the first normal along the first normal line NLa of the first surface SFa in the columnar member 1, and is propagated in the direction of the first normal by the semitransparent mirror 3. Since the imager CA reflects in the direction of the second normal along the second normal NLb of the third surface SFc in the columnar member 1 orthogonal to the normal NLa, the optical axis AX of the image pickup apparatus CA is the second normal NLb. Arranged to match. The upper wall WLa of the housing HS in the OLED lighting device LPa is further provided with an attachment to which the image pickup device CA can be attached and detached for mounting the image pickup device CA, and the image pickup device CA may be attached to the attachment. ..

In such an illumination imaging system S, when power is supplied via the cable LN and the OLED light emitting unit 2 of the OLED lighting module ML emits light by the drive unit 5, the light emitted by the OLED light emitting unit 2 is the first. It is incident on the columnar member 1 from the surface SFa, propagates in the columnar member 1 in the direction of the first normal along the first normal line NLa of the first surface SFa, reaches the second surface SFb, and a part thereof is half. It is reflected by the fluoroscope 3 toward the third surface Sfc, propagates in the columnar member 1 in the second normal direction along the second normal line NLb of the third surface Sfc, is emitted from the third surface Sfc, and the rest thereof. Passes through the semitransparent mirror 3. The light radiated from the third surface SFc becomes illumination light, and the work WK is illuminated by this illumination light. On the other hand, the image pickup apparatus CA arranged as described above includes the first through opening APa of the housing HS, the auxiliary member 4, the semitransparent mirror 3 and the columnar member 1 in the OLED lighting module ML, and the housing HS. The work WK of the subject is captured through the two through openings APb, and the work WK illuminated by the illumination light from the OLED lighting device LPa is imaged. That is, the optical image of the work WK is incident on the image pickup apparatus CA via the second through opening APb of the housing HS, the columnar member 1, the semitransparent mirror 3, the auxiliary member 4, and the first through opening APa of the housing HS. , The image is taken by the image pickup device CA.

As described above, the OLED lighting module ML, the OLED lighting device LPa provided with the OLED lighting module ML, and the illumination imaging system S provided with the OLED lighting module ML according to the first embodiment are surface-emitting on the first surface SFa of the columnar member 1. Since the possible OLED light emitting unit 2 is formed, the reflective film and the diffuser can be omitted in the OLED lighting module ML. Therefore, since the above-mentioned event caused by the diffuser does not occur, the OLED lighting module ML, the OLED lighting device LPa, and the lighting imaging system S can be further miniaturized, and the shadow is less likely to be formed. Therefore, the illumination imaging system S can generate an image of the work WK without the shadow.

Further, in the conventional lighting device 1000, it is necessary to assemble the beam splitter 1001, the diffuser plate 1002 and a plurality of LEDs 1003 in the housing 1004, but the OLED lighting device LPa is integrated with the OLED lighting module ML, that is, Since the columnar member 1, the OLED light emitting unit 2 and the semitransparent mirror 3 may be assembled to the housing HS, the number of parts is reduced, so that the assembling property is improved and the cost can be expected to be reduced.

In the above-mentioned OLED lighting device LPa, the auxiliary member 4 may be omitted. In this case, the cover glass may be fitted into the first through opening APa from the viewpoint of preventing the semitransparent mirror 3 from being contaminated by dust or the like.

Further, in the above-mentioned OLED lighting device LPa, the drive unit 5 may be omitted. In this case, the cable LN is connected to the OLED light emitting unit 2, and power having a current value appropriately set so that the OLED light emitting unit 2 emits light with a predetermined amount of light is supplied to the OLED light emitting unit 2 via the cable LN. Ru.

Further, in the above-mentioned OLED lighting device LPa, from the viewpoint of preventing stray light, a film such as black paint or the like is formed between the first surface SFd of the auxiliary member 4 and the inner wall surface of the side wall WLc on the one side of the housing HS. A light absorbing layer that absorbs light such as a shape, a black cloth, and a black paper may be arranged.

Next, another embodiment will be described.
(Second Embodiment)
The OLED lighting device LPa in the first embodiment is configured to include one OLED lighting module ML, but the OLED lighting device in the second embodiment includes a plurality of OLED lighting modules and each of the OLED lighting modules. It is a device that aligns and emits each light emitted by the OLED light emitting unit in the same direction. Hereinafter, the case where the number of OLED lighting modules is three will be described more specifically, but the number is not limited to three, and two or four or more may be used.

FIG. 3 is a diagram for explaining the configuration of the OLED lighting device according to the second embodiment. FIG. 3A is a cross-sectional view showing the configuration of the OLED lighting device, and FIG. 3B is a cross-sectional view showing the configuration of the OLED lighting module used in the OLED lighting device.

In such a second embodiment, the OLED lighting device LPb includes, for example, three first to third OLED lighting modules MLG, MLR, MLB and two first and second auxiliary members, as shown in FIG. 3A. It includes 4a and 4b.

The first to third OLED lighting modules MLG, MLR, and MLB have basically the same configuration as shown in FIGS. 3A and 3B, except that the emission color (emission wavelength band) of the OLED light emitting unit 2 is different. The first OLED lighting module MLG will be mainly described, and for the second and third OLED lighting modules MLR and MLG, the reference numerals of the components of the first OLED lighting module MLG corresponding to the components of the second and third OLED lighting modules MLR and MLG. The description of the second and third OLED lighting modules MLR and MLG is replaced with the description of these codes in parentheses following. The code subscript "G" represents a component related to the first OLED lighting module MLG, and the code subscript "R" represents a component related to the second OLED lighting module MLR, and the code subscript "B". Represents a component of the third OLED lighting module MLB.

The first OLED lighting module MLG (MLR, MLB) is a device including an OLED and radiating light emitted by the OLED from a predetermined direction. For example, as shown in FIG. 3, a columnar member 1G (1R, 1B) The OLED light emitting unit 2G (2R, 2B) and the semitransparent mirror 3G (3R, 3B) are provided. The OLED light emitting unit 2G (2R, 2B) and the semitransparent mirror 3G (3R, 3B) of the first OLED lighting module MLG (MLR, MLB) in the OLED lighting device LPb of the second embodiment each emit light color of the OLED light emitting unit 2. Except for the above points, the same is true for the OLED light emitting unit 2 and the semitransparent mirror 3 of the OLED lighting module ML in the OLED lighting device LPa of the first embodiment, and the description thereof will be omitted.

The columnar member 1G (1R, 1B) includes a first surface SFaG (SFaR, SFaB) and a second surface SFbG (SFbR, SFbB) that intersects the first surface SFaG (SFaR, SFaB) at a predetermined angle θ. It is a columnar optical element, and is made of a material that is transparent to the wavelength of light emitted from each OLED light emitting unit 2G, 2R, and 2B. More specifically, in the present embodiment, the columnar member 1G (1R, 1B) has a quadrangular prism shape having the predetermined angle θ of 45 degrees, and more specifically, a third surface SFcG (SFcR, SfcB). It is a quadrilateral prism-shaped member having a parallelogram cross section having a fourth surface SFdG (SFdR, SFdb) and both side surfaces (reference numerals omitted), and is a first surface SFaG (SFaR, SFaB), a second surface SFbG (SFbR, SFbB), the third surface SFcG (SFcR, SfcB) and the fourth surface SFdG (SFdR, SFdb) are connected in this order (note that the fourth surface SFdG (SFdR, SFdb) is the first surface SFaG (SFaR, It is linked to SFaB)). Therefore, the angle formed by the first surface SFaG (SFaR, SFaB) and the second surface SFbG (SFbR, SFbB), and the formation of the third surface SfcG (SFcR, SfcB) and the fourth surface SFdG (SFdR, SFdb). The angles are 45 degrees, respectively, and the angles formed by the first surface SFaG (SFaR, SFaB) and the fourth surface SFdG (SFdR, SFdb), and the second surface SFbG (SFbR, SFbB) and the third surface SFcG. The angle formed by (SFCR, SFcB) is 135 degrees, respectively. The size of the second surface SFbG (SFbR, SFbB) is such that the semitransparent mirror 3G (3R, 3B) formed on the second surface SFbG (SFbR, SFbB) can receive all the light from the OLED light emitting unit 2G (2R, 2B). When the OLED light emitting unit 2G (2R, 2B) formed on the surface SFaG (SFaR, SFaB) is projected onto the second surface SFbG (SFbR, SFbB), the projected OLED light emitting unit 2G (2R, 2B) is projected. ) Is preferably included.

Then, the first to third OLED lighting modules MLG, MLR, and MLB are arranged so as to align and emit the respective lights emitted by the respective OLED light emitting units 2G, 2R, and 2B in the same direction. Further, in the second embodiment, in the first to third OLED lighting modules MLG, MLR, and MLB, the closer to the light radiation surface of the OLED lighting device LPb, the smaller the light radiation efficiency of the OLED light emitting units 2G, 2R, and 2B. Arranged to be. In other words, the first to third OLED lighting modules MLG, MLR, and MLB are arranged so that the light radiation efficiency of the OLED light emitting units 2G, 2R, and 2B increases as the distance from the light radiation surface of the OLED lighting device LPb increases. There is.

More specifically, in the first to third OLED lighting modules MLG, MLR, and MLB, the columnar members 1G, 1R, and 1B are sequentially connected in a row so that the reflection directions of the semitransparent mirrors 3G, 3R, and 3B are aligned. As a result, the lights emitted by the OLED light emitting units 2G, 2R, and 2B are arranged so as to be aligned and emitted in the same direction. The OLED light emitting unit 2G of the first OLED lighting module MLG is configured to include a first organic light emitting layer that emits green light, and the OLED light emitting unit 2R of the second OLED lighting module MLR emits red light. The OLED light emitting unit 2B of the third OLED lighting module MLB is configured to include a light emitting layer, and is configured to include a third organic light emitting layer that emits blue light. In general, the emission efficiency is higher in the order of OLED that emits green light, OLED that emits red light, and OLED that emits blue light ((Emission efficiency of OLED that emits green light)> (red). Emission efficiency of OLED that radiates light from)> (Emission efficiency of OLED that radiates blue light). Therefore, in the second embodiment, the first to third OLED lighting modules MLG, MLR, and MLB are the third OLED lighting module MLB, the second OLED lighting module MLR, and the first OLED lighting from the light emitting surface of the OLED lighting device LPb. The modules are arranged in the order of MLG.

More specifically, in contrast to the columnar member 1G of the first OLED lighting module MLG, in the columnar member 1R of the second OLED lighting module MLR, the second surface SFbR of the columnar member 1R passes through the semitransparent mirror 2R in the first OLED lighting module MLG. The columnar member 1B of the third OLED lighting module MLB is arranged so as to be in contact with the fourth surface SFdG of the columnar member 1G, and the second surface SFbB of the columnar member 1B is the columnar member 1B of the third OLED lighting module MLB with respect to the columnar member 1R of the second OLED lighting module MLR. It is arranged so as to abut on the fourth surface SFdR of the columnar member 1R in the second OLED lighting module MLR via the semitransparent mirror 2B.

The first auxiliary member 4a protects the semitransparent mirror 3G of the first OLED lighting module MLG, and when the first to third OLED lighting modules MLG, MLR, and MLB are housed in the housing shown in the drawing, the first auxiliary member 4a and the first OLED lighting module MLG. It is a member for filling the space formed by the housing. More specifically, for example, the first auxiliary member 4a is made of a material that is transparent to the wavelength of the light emitted from each OLED light emitting unit 2G, 2R, and 2B, and the columnar member 1G in the first OLED lighting module MLG. It is a triangular prism-shaped member having a right-angled isosceles triangle with a slope having the same area as the second surface SFbG. The second auxiliary member 4b is a member for filling the space formed by the third OLED lighting module MLB and the housing when the first to third OLED lighting modules MLG, MLR, and MLB are housed in the housing. Is. More specifically, for example, the second auxiliary member 4b is made of a material transparent to the wavelength of the light emitted from each OLED light emitting unit 2G, 2R, 2B, and is formed of a columnar member 1B in the third OLED lighting module MLG. It is a triangular prism-shaped member having a right-angled isosceles triangle with a slope having the same area as the fourth surface SFdB. In such first and second auxiliary members 4a and 4b, the slope of the first auxiliary member 4a is brought into contact with the semitransparent mirror 3G of the first OLED lighting module MLG, and the slope of the second auxiliary member 4b is brought into contact with the third OLED lighting module. By abutting on the fourth surface SFdB of the MLG, the columnar members 1G, 1R, 1B and the second auxiliary member 4b of the first auxiliary member 4a, the first to third OLED lighting modules MLG, MLR, and MLB have a rectangular cross-sectional shape. It becomes the shape of a prism. Then, the surface SFex of the second auxiliary member 4b whose normal is a line extending along the reflection direction of each of the semitransparent mirrors 3G, 3R, and 3B in the first to third OLED lighting modules MLG, MLR, and MLB is the OLED lighting device. It becomes the light emission plane SFex of LPb.

In the OLED lighting device LPa having such a configuration, in the first OLED lighting module MLG, an OLED light emitting unit 2G is formed on the first surface SFaG, a semitransparent mirror 3G is formed on the second surface SFbG, and the first surface is formed. Since the angle θ formed by the SFaG and the second surface SFbG is 45 degrees, the light emitted by the OLED light emitting unit 2G is incident on the columnar member 1G from the first surface SFaG and reaches the second surface SFbG, one of which. The portion is reflected by the semitransparent mirror 3G toward the fourth surface SFdG and is incident on the semitransparent mirror 3R of the second OLED lighting module MLR via the fourth surface SFcG, and the rest thereof is transmitted through the semitransparent mirror 3G. In the semitransparent mirror 3R of the second OLED lighting module MLR, a part of the light emitted by the OLED light emitting unit 2G is further reflected by the semitransparent mirror 3R toward the third surface SFaG, and the rest is the semitransparent mirror. It penetrates the 3Rs.

In the second OLED lighting module MLR, an OLED light emitting unit 2R is formed on the first surface SFaR, a semitransparent mirror 3R is formed on the second surface SFbR, and an angle θ formed by the first surface SFaR and the second surface SFbR. Is 45 degrees, the light emitted by the OLED light emitting unit 2R is incident on the columnar member 1R from the first surface SFaR, reaches the second surface SFbR, and a part of the light is transferred to the fourth surface SFdR by the semitransparent mirror 3R. It is reflected toward the light of the first OLED lighting module MLG and is incident on the semitransparent mirror 3B of the third OLED lighting module MLB via the fourth surface SFcR, and the rest thereof is transmitted through the semitransparent mirror 3R. In the semitransparent mirror 3B of the third OLED lighting module MLB, a part of the light emitted by the OLED light emitting unit 2B is combined with the light of the first OLED lighting module MLG, and a part of the light is further directed to the third surface SFaR by the semitransparent mirror 3B. And the rest is transmitted through the semitransparent mirror 3B.

In the third OLED lighting module MLB, an OLED light emitting unit 2B is formed on the first surface SFaB, a semitransparent mirror 3B is formed on the second surface SFbB, and an angle θ formed by the first surface SFaB and the second surface SFbB. Is 45 degrees, the light emitted by the OLED light emitting unit 2B is incident on the columnar member 1B from the first surface SFaB, reaches the second surface SFbB, and a part of the light is transferred to the fourth surface SFdB by the semitransparent mirror 3B. It is reflected toward and incident on the second auxiliary member 4b via the fourth surface SFcB together with the light of the first and second OLED lighting modules MLG and MLR, and the rest thereof passes through the semitransparent mirror 3B.

Then, the light of the first to third OLED lighting modules MLG, MLR, and MLB incident on the second auxiliary member 4b is transmitted from the surface SFex of the second auxiliary member 4b, that is, the light emission surface SFex of the OLED lighting device LPb. Be ejected.

Since the light emitted by each OLED light emitting unit 2G, 2R, and 2B propagates in this way, the semitransparent mirrors 3G, 3R, and 3B of the first to third OLED lighting modules MLG, MLR, and MLB are each OLED light emitting unit 2G. When designed and created with a transmission rate of 50% with respect to the wavelength of the light emitted from 2, 2R and 2B, the light emitted by the OLED light emitting unit 2G of the first OLED lighting module MLG is logically three semitransparent mirrors. Since it acts on 3G, 3R, and 3B, the light emitted from the light emitting surface SFex with a light amount of 1/8 of the initial light amount and emitted by the OLED light emitting unit 2R of the second OLED lighting module MLR is two semitransparent mirrors. Since it acts on 3R and 3B, the light emitted from the light emitting surface SFex with a light amount of 1/4 of the initial light amount and emitted by the OLED light emitting unit 2B of the 3rd OLED lighting module MLB is combined with one semitransparent mirror 3B. Since it works, it is emitted from the light emitting surface SFex with a light amount of 1/2 of the initial light amount. Therefore, in one example, when the same amount of light is emitted from the light emitting surface SFex, the OLED light emission of the first OLED lighting module MLG is relative to the amount of light emitted by the OLED light emitting unit 2B of the third OLED lighting module MLB. The unit 2G needs to emit light with four times the amount of light, and the OLED light emitting unit 2R of the second OLED lighting module MLR needs to emit light with twice the amount of light.

On the other hand, when the OLED lighting device LPb in the second embodiment is used in a lighting imaging system like the OLED lighting device LPa in the first embodiment, the OLED lighting device LPb in the second embodiment is, for example, on a support. It is arranged at a position separated from the support by a predetermined third distance (third height) so as to illuminate the work placed on the support. Then, with respect to the OLED lighting device LPb arranged in this way, the image pickup device CA is, for example, a half in the first to third OLED lighting modules MLG, MLR, MLB in the OLED lighting device LPb, as shown by a broken line in FIG. 3A. It is arranged at a position separated from the OLED lighting device LPb by a predetermined fourth distance (fourth height) so as to align the optical axis direction of the image pickup device CA with the reflection directions of the fluoroscopes 3G, 3R, and 3B. In the present embodiment, the image pickup apparatus CA has the surface SFsv of the first auxiliary member 4a facing the surface SFex of the second auxiliary member 4b of the OLED lighting device LPb via the first to third OLED lighting modules MLG, MLR, and MLB. The optical image of the work WK, which is incident via the above, is imaged. In the image pickup apparatus CA shown by the broken line in FIG. 3A, the optical image of the work WK is received through the three semitransparent mirrors 3G, 3R, and 3B of the first to third OLED lighting modules MLG, MLR, and MLB. ..

As described above, since the OLED lighting device LPb in the second embodiment includes a plurality of OLED lighting modules ML, and in this example, three first to third OLED lighting modules MLG, MLR, and MLB, the above-mentioned OLED lighting. In the apparatus LPb, the diffuser plate can be omitted. Therefore, since the above-mentioned event caused by the diffuser does not occur, the above-mentioned shadow is difficult to be formed in the above-mentioned OLED lighting device LPb. Since the OLED lighting device LPb includes three first to third OLED lighting modules MLG, MLR, and MLB having different emission colors from each other, it is possible to irradiate three colors of illumination light of green, red, and blue, and green, red, and It is possible to illuminate a composite color of illumination light, which is a composite of a plurality of blue colors.

In the OLED lighting device LPb, the more light emitted from the OLED lighting module ML (MLG, MLR, MLB) arranged at a position far from the light emitting surface SFex of the OLED lighting device LPb, the more translucent mirror 3 (3G). 3R, 3B) must be transmitted. In the OLED lighting device LPb, the closer the OLED lighting modules MLG, MLR, and MLB are to the light emitting surface SFex of the OLED lighting device LPb, the smaller the light radiation efficiency of the OLED light emitting unit 2 (2G, 2R, 2B). In other words, the OLED lighting modules MLG, MLR, and MLB are arranged so that the light emission efficiency of the OLED light emitting unit 2 increases as the distance from the light emission surface SFex of the OLED lighting device LPb increases. Therefore, the OLED lighting device LPb can irradiate the light radiated from the OLED lighting module ML located at a position far from the light emitting surface SFex of the OLED lighting device LPb with a larger amount of light.

The above-mentioned OLED lighting device LPa includes three first to third OLED lighting modules MLG, MLR, and MLB having different emission colors from each other, but in order to increase the intensity of light emitted from the OLED lighting device LPb. In addition, the OLED light emitting units 2G, 2R, and 2B in the first to third OLED lighting modules MLG, MLR, and MLB may emit light of the same color to each other.

In order to express the present invention, the present invention has been appropriately and sufficiently described through embodiments with reference to the drawings above, but those skilled in the art can easily modify and / or improve the above embodiments. It should be recognized that it is possible. Therefore, unless the modified or improved form implemented by a person skilled in the art is at a level that deviates from the scope of rights of the claims stated in the claims, the modified form or the improved form is the scope of rights of the claims. It is interpreted to be included in.

S lighting imaging system; ML, MLG, MLR, MLB OLED lighting module; LPa, LPb OLED lighting device; CA imaging device; WK work; SFa, SFaG, SFaR, SFaB first surface; SFb, SFbG, SFbR, SFbB second Surface; 1,1G, 1R, 1B columnar member; 2,2G, 2R, 2B OLED light emitting part; 3,3G, 3R, 3B semi-translucent mirror

Claims (4)

A columnar member including a first surface and a second surface that intersects the first surface at a predetermined angle.
The OLED light emitting unit formed on the first surface and the
A semitransparent mirror formed on the second surface, reflecting a part of the light radiated from the OLED light emitting portion, and transmitting the remaining light is provided.
The columnar member is made of a material that is transparent to the wavelength of the light emitted from the OLED light emitting portion.
OLED lighting module. The plurality of OLED lighting modules according to claim 1 are provided.
The plurality of OLED lighting modules are arranged so as to align and emit each light emitted by each OLED light emitting unit in the same direction.
OLED lighting device. The plurality of OLED lighting modules are arranged so that the closer to the light radiating surface of the OLED lighting device, the smaller the light radiating efficiency of the OLED light emitting unit.
The OLED lighting device according to claim 2. The OLED lighting module according to claim 1, or the OLED lighting device according to claim 2 or 3.
It is arranged so as to align the optical axis direction with the reflection direction of the semitransparent mirror, and includes an image pickup unit that captures an image of a subject via the semitransparent mirror and the columnar member.
Illumination imaging system.

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