JP2014089997A - Imaging device and illumination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the amount of light produced by a light-emitting unit.SOLUTION: An imaging device 100 comprises a light-receiving unit 10 in which a plurality of light-receiving elements 14 are arranged; and a light source unit 36 disposed between the light-receiving unit 10 and a subject 200. In the light source unit 36, light-emitting units 50 for irradiating the subject 200 with light, and transmission units 60 for transmitting light originating from the subject 200 to the light-receiving unit 10 side are arranged in a planar configuration. At least a part of the rim of the light-emitting unit 50 has a shape that conforms to the rim of the transmission unit 60 in plan view. Specifically, the rim of the transmission units 60 has a circular shape, and the rim of the light-emitting unit 50 has an arcuate shape concentric to the rim of the transmission unit 60.

Description

  The present invention relates to a technique for illuminating an object.

  Various techniques for capturing a vein image of a living body for biometric authentication have been proposed. For example, Patent Document 1 discloses an imaging device having a structure in which a light source layer and a detection layer are stacked on a surface of a substrate. In the technique of Patent Document 1, the subject is illuminated by the light source element of the light source layer, and light coming from the subject side is detected by each light receiving element of the detection layer after passing through the transmission part of the light source layer.

JP 2009-3821 A

  In order to clearly capture a subject under the technique of Patent Document 1, it is important to secure a sufficient amount of light emitted from each light source element to the subject. If the electric energy supplied to each light source element is increased, the amount of light can be increased, but there is a problem that the power consumption increases. In the above description, the illumination of the subject imaged by the imaging device is focused. However, an illumination device (so-called front light) is arbitrarily installed between the light receiving side of light coming from the object to be illuminated and the object. A similar problem may occur under the configuration. In view of the above circumstances, an object of the present invention is to ensure a sufficient amount of light that can be used for illumination of an object.

  In order to solve the above problems, an imaging apparatus of the present invention includes a light receiving unit in which a plurality of light receiving elements are disposed, and a light source unit disposed between the light receiving unit and the subject. The light emitting unit for irradiating the subject with light and the transmission unit for transmitting the light coming from the subject to the light receiving unit side are arranged in a planar shape, and at least a part of the periphery of the light emitting unit is the periphery of the transmission unit in plan view It is a shape along. In the above configuration, since at least a part of the periphery of the light emitting unit is shaped along the periphery of the transmission unit in plan view, for example, when forming a rectangular light emission unit so as not to overlap the transmission unit in plan view ( In comparison with (proportional), the area of the light emitting part is enlarged. Therefore, it is possible to use a sufficient amount of light for illuminating the subject. In other words, it is possible to reduce power consumption as compared with the case where a light amount equivalent to the proportionality is secured by an increase in electrical energy.

  In a preferred aspect of the present invention, the light source unit includes a plurality of transmission parts, and at least a part of the periphery of the light emitting part has a shape along the periphery of each of the plurality of transmission parts located around the light emission part. . In the above configuration, since at least a part of the periphery of the light emitting unit is shaped along the periphery of each of the plurality of transmission units located around the light emitting unit, the area of the light emitting unit is reduced compared to the comparative example. The effect that it can be secured sufficiently is particularly remarkable.

  In a preferred aspect of the present invention, the periphery of the transmission part is circular, and a part of the periphery of the light emitting part is arcuate and concentric with the periphery of the transmission part. In the above configuration, since a part of the periphery of the light emitting part is formed in an arc shape along the circular periphery of the transmission part in a plan view, the effect that the area of the light emitting part can be sufficiently secured as compared with the comparative example. Is particularly prominent.

  In a preferred aspect of the present invention, a condensing unit that condenses light coming from the subject and emits the light to the light receiving unit side is provided. In the above configuration, since the reflected light from the subject is collected by the light collecting unit and reaches the light receiving unit, there is an advantage that a sufficient amount of light reaching the light receiving unit from the subject can be secured.

  In a preferred aspect of the present invention, the light source unit includes a plurality of light emitting units arranged in a plane, and a wiring that supplies current to one light emitting unit and a wiring that supplies current to another light emitting unit are spaced from each other. It is formed with a gap. For example, the plurality of light emitting units are arranged in a matrix along a first direction (for example, the X direction) and a second direction (for example, the Y direction) that intersect each other, and the first light emitting units are spaced apart from each other in the second direction. Each of the plurality of wirings extending in the direction is electrically connected to two or more light emitting units arranged in the first direction. According to the above configuration, for example, compared to a case where wirings extending over all the light emitting units (for example, a grid-like wiring corresponding to a matrix arrangement of a plurality of light emitting units) are formed in one light emitting unit. There is an advantage that the range in which the influence of a defect (for example, a short circuit between electrodes) that can occur can be limited.

  The imaging device according to each aspect described above is suitably used for various electronic devices. Specific examples of electronic devices include a biometric authentication device that performs biometric authentication using a vein image captured by an imaging device, and blood alcohol concentration, blood glucose level, and the like from an image (for example, a vein image) captured by the imaging device. Medical devices (biological information estimation devices such as blood alcohol concentration estimation devices and blood glucose level estimation devices) that estimate biological information can be exemplified.

  Moreover, this invention is specified also as an illuminating device which illuminates an object. An illumination device of the present invention includes a light source unit in which a light emitting unit that emits light and a transmission unit that transmits light are arranged in a planar shape, and at least a part of the periphery of the light emitting unit is a plan view of the transmission unit. It is a shape along the periphery. The illumination device of the present invention can be suitably used as a light source (front light) for illuminating display devices of various electronic devices, in addition to the imaging devices exemplified in the above-described embodiments.

It is sectional drawing of the imaging device which concerns on embodiment of this invention. It is an exploded sectional view of an imaging device. It is a top view which shows the positional relationship of each element of an imaging device. It is sectional drawing of a wiring layer and a light source part. It is a top view of a light source part. It is a top view explaining the planar shape of a light emission part and a permeation | transmission part. It is a top view for demonstrating the effect of 1st Embodiment. It is a top view of the illumination part in 2nd Embodiment. It is sectional drawing of the IX-IX line in FIG.

<First Embodiment>
FIG. 1 is a cross-sectional view of the imaging apparatus 100 according to the first embodiment of the present invention, and FIG. 2 is an exploded cross-sectional view of the imaging apparatus 100. The imaging apparatus 100 according to the present embodiment is a sensing apparatus that captures an image of the subject 200 in a state where light of a specific wavelength (hereinafter referred to as “imaging light”) is irradiated. For example, a vein of a living body (typically, a human finger). It is suitably used for a biometric authentication device (venous sensor) that captures an image. Therefore, for example, near-infrared light that passes through a living body is suitable as imaging light.

  As shown in FIGS. 1 and 2, the imaging apparatus 100 of the present embodiment includes a light receiving unit 10, a light collecting unit 20, and an illumination unit 30. The illumination unit 30 is disposed on the subject 200 side of the light receiving unit 10 (between the light receiving unit 10 and the subject 200), and the light collecting unit 20 is disposed on the subject 200 side of the illumination unit 30 (between the illumination unit 30 and the subject 200). Be placed. That is, the illumination unit 30 is located between the light receiving unit 10 and the light collecting unit 20. Schematically, incident light from the subject 200 illuminated by the imaging light emitted from the illumination unit 30 is collected by the light collection unit 20, then passes through the illumination unit 30 and reaches the light receiving unit 10.

  The light receiving unit 10 is an element that captures an image of the subject 200 and includes a substrate 12 and a plurality of light receiving elements 14. The substrate 12 is a plate-like member made of, for example, a semiconductor material. The plurality of light receiving elements 14 are formed on a surface (light receiving surface) 121 on the subject 200 side of the substrate 12 and intersect each other in a plan view (that is, viewed from a direction perpendicular to the surface 121) as shown in FIG. They are arranged in a matrix along the X and Y directions. Each light receiving element 14 generates a detection signal corresponding to the amount of received light. An image of the subject 200 is generated by performing image processing on the detection signal generated by each light receiving element 14. For example, a known CMOS (Complementary Metal Oxide Semiconductor) sensor or CCD (Charge Coupled Device) sensor is suitably used as the light receiving unit 10.

  The condensing unit 20 in FIG. 1 is an element that condenses imaging light coming from the subject 200 side, and includes a substrate 22 and a plurality of lenses 24 (microlenses). As shown in FIG. 2, the substrate 22 is a light-transmitting (a property that transmits imaging light) plate-shaped member that includes a surface 221 that faces the subject 200 and a surface 222 opposite to the surface 221. For example, a glass substrate or a quartz substrate is preferably used as the substrate 22. The plurality of lenses 24 are formed on the surface 222 of the substrate 22. Each lens 24 is a convex lens that collects imaging light that has entered the surface 221 of the substrate 22 from the subject 200 and has transmitted through the substrate 22.

  As shown in FIGS. 1 to 3, each lens 24 of the light collecting unit 20 and each light receiving element 14 of the light receiving unit 10 correspond one-to-one. Specifically, as shown in FIG. 1, the optical axis L0 of each lens 24 passes through the light receiving element 14 (typically the center of the light receiving element 14) corresponding to the lens 24. Therefore, as shown in FIG. 3, the plurality of lenses 24 are arranged in a matrix along the X direction and the Y direction in a plan view like the respective light receiving elements 14.

  The illumination unit 30 in FIG. 1 is an element that generates imaging light to illuminate the subject 200 and transmits the imaging light condensed by each lens 24 toward each light receiving element 14, and includes a substrate 32, a light shielding layer 33, and wiring. The layer 35 includes a light source unit 36 and a protective layer 37. As shown in FIG. 2, the substrate 32 is a light-transmissive plate member (for example, a glass substrate or quartz) that includes a surface 321 that faces the light collecting unit 20 (each lens 24) and a surface 322 opposite to the surface 321. Substrate). The light shielding layer 33 is a film body having a light shielding property (a property of absorbing or reflecting imaging light) formed on the surface 322 of the substrate 32. As shown in FIGS. 1 to 3, a plurality of circular openings 34 corresponding to the respective light receiving elements 14 are formed in the light shielding layer 33.

  The wiring layer 35 in FIG. 1 is formed on the surface 321 of the substrate 32 and includes a wiring for supplying a current to the light source unit 36. The light source unit 36 is formed on the surface of the wiring layer 35 and illuminates the subject 200 and transmits imaging light from the subject 200 side to each light receiving element 14 side. As shown in FIGS. 2 and 3, the light source unit 36 is divided into a plurality of light emitting units 50 and a plurality of transmission units 60 in a plan view (that is, a state viewed from a direction perpendicular to the surface 321 of the substrate 32). In FIG. 3, the area of each light emitting unit 50 is hatched for convenience.

  Each light emitting unit 50 generates imaging light for illuminating the subject 200 and emits it to the subject 200 side. Each transmitting unit 60 transmits incident light from the subject 200 side to each light receiving element 14 side. As shown in FIG. 3, each transmission part 60 is formed in a circular shape in plan view. Each transmission part 60 of the light source part 36 and each lens 24 (or each light receiving element 14 of the light receiving part 10) of the light collecting part 20 correspond one-to-one. Specifically, as shown in FIG. 1, the optical axis L 0 of each lens 24 passes through a transmission part 60 (typically the center of the transmission part 60) corresponding to the lens 24. Therefore, as shown in FIG. 3, the transmission parts 60 are arranged in a matrix along the X direction and the Y direction in a plan view like the lenses 24 and the light receiving elements 14. As shown in FIG. 3, each light emitting unit 50 is formed in a region surrounded by each transmitting unit 60. Accordingly, the light emitting units 50 are also arranged in a matrix along the X direction and the Y direction in a plan view like the lenses 24 and the light receiving elements 14. The protective layer 37 in FIG. 1 is an element (sealing layer) that seals the light source unit 36 and protects it from the outside air and moisture, and is formed of a light-transmissive insulating material (for example, a resin material).

  The light receiving unit 10 and the illumination unit 30 are fixed to each other with a light-transmitting adhesive 18, for example. Moreover, as for the condensing part 20 and the illumination part 30, each outer peripheral part is mutually fixed. In FIG. 1, the structure which joined the condensing part 20 and the illumination part 30 so that the surface of each lens 24 of the condensing part 20 and the surface of the protective layer 37 of the illumination part 30 may contact is illustrated. However, it is also possible to fix the light collecting unit 20 and the illumination unit 30 to each other so that the surface of each lens 24 and the surface of the protective layer 37 face each other with a space therebetween.

  In the configuration described above, the imaging light emitted from the light emitting unit 50 of the light source unit 36 is transmitted through the condensing unit 20 (the substrate 22 and each lens 24) to be irradiated on the subject 200 and to the veins inside the subject 200. Then, the light is scattered or reflected to be incident on the condensing unit 20, collected by each lens 24, and then passes through the transmission unit 60 of the light source unit 36, the substrate 32, and the opening 34 of the light shielding layer 33. To reach. Therefore, a vein image of the subject 200 is captured. In the above configuration, since the imaging light from the subject 200 illuminated by the light source unit 36 is collected by each lens 24 of the light collecting unit 20 and reaches the light receiving element 14, an element for collecting the imaging light is provided. Compared with the technique of Patent Document 1 that does not exist, there is an advantage that a sufficient amount of light reaching each light receiving element 14 from the subject 200 can be secured.

  FIG. 4 is an enlarged cross-sectional view of the wiring layer 35 and the light source unit 36. As shown in FIG. 4, the wiring layer 35 includes a wiring 351 formed on the surface 321 of the substrate 32 and a light-transmissive insulating layer 352 that is formed over the entire surface 321 and covers the wiring 351. The The wiring 351 of the wiring layer 35 is formed in a region overlapping with the light emitting unit 50 in a plan view and does not overlap with each transmission unit 60. For example, the wiring 351 is formed in a lattice shape in which a plurality of portions extending in the X direction with a space between each other and a plurality of portions extending in the Y direction with a space between each other are crossed. As shown in FIG. 4, the light source unit 36 includes a reflective layer 361, an insulating layer 362, a first electrode layer 363, an insulating layer 364, a light emitting layer 365, and a second electrode layer 366.

  The reflection layer 361 is a light-reflective thin film that is formed in a region corresponding to the light emitting unit 50 on the surface of the wiring layer 35 (insulating layer 352) and reflects light generated by the light emitting layer 365 toward the subject 200. The reflective layer 361 is formed of a conductive material such as silver or aluminum. As shown in FIGS. 4 and 5, the reflective layer 361 is not formed in the transmissive portion 60. The insulating layer 362 of FIG. 4 is formed on the surface of the wiring layer 35 with a light transmissive insulating material and covers each reflective layer 361.

  The first electrode layer 363 is formed in a region corresponding to the light emitting unit 50 on the surface of the insulating layer 362. As shown in FIGS. 4 and 5, the first electrode layer 363 is electrically connected to the wiring 351 of the wiring layer 35 through the contact hole 353 that penetrates the insulating layer 362 and the insulating layer 352, and the light emitting layer 365. It functions as an electrode (anode) for supplying a current. The first electrode layer 363 is formed of a light transmissive conductive material such as ITO (Indium Tin Oxide). An insulating layer 364 is formed on the surface of the insulating layer 362 on which the first electrode layer 363 is formed.

  The light emitting layer 365 is formed to have a substantially constant film thickness over both the light emitting unit 50 and the transmission unit 60 so as to cover the first electrode layer 363 and the insulating layer 364. As shown in FIG. 4, the light emitting layer 365 is an electro-optical layer that emits light when supplied with an electric current, and is formed of, for example, an organic EL (Electroluminescence) material. Note that although the light emitting layer 365 is illustrated as a single layer for convenience in FIG. 4, a charge transport layer (hole transport layer, electron transport layer) or a charge injection layer (hole transport) for improving the light emission efficiency of the light emitting layer 365 is shown. It is also possible to form an injection layer or an electron injection layer. Further, the material of the light emitting layer 365 is not limited to the organic EL material.

  The second electrode layer 366 is a light-transmitting film body that is continuously formed over the entire surface of the light emitting layer 365, and is an electrode (cathode) that supplies current to the light emitting layer 365 with the first electrode layer 363. Function as. The protective layer 37 described above is formed so as to cover the second electrode layer 366.

  As shown in FIG. 5, the insulating layer 364 includes a plurality of first portions 71 and a plurality of second portions 72. Each first portion 71 is an annular portion in plan view, and is arranged in a matrix along the X direction and the Y direction corresponding to each lens 24. That is, the optical axis L0 of each lens 24 passes through the inside of the first portion 71 corresponding to the lens 24 (typically, the center of the first portion 71). Each second portion 72 is a linear portion connecting the first portions 71 adjacent to each other in the X direction or the Y direction. A contact hole 353 for conducting the first electrode layer 363 to the wiring 351 is covered with the second portion 72 of the insulating layer 364.

  In the region surrounded by the outer periphery of each first portion 71 and the periphery of the second portion 72, the first electrode layer 363 and the second electrode layer 366 are in contact with the light emitting layer 365 therebetween. Therefore, a region surrounded by the outer periphery of each first portion 71 and the periphery of the second portion 72 in the plan view in the light source unit 36 functions as the light emitting unit 50. On the other hand, the transmission part 60 is an area surrounded by the inner peripheral edge of each first portion 71 in the light source part 36. Since the first electrode layer 363 is not formed in the transmissive part 60, the light emitting layer 365 in the transmissive part 60 does not emit light. As described above, the insulating layer 364 functions as an element that defines each light emitting section 50 and each transmission section 60 (an element that separates both).

  FIG. 6 is a plan view illustrating the planar shapes of the light emitting unit 50 and the transmissive unit 60. As understood from FIG. 6, the periphery of the transmission part 60 is a circle C1 having a radius r centered on a point P (a point on the optical axis L0 of the lens 24) in plan view. The circle C1 corresponds to the inner peripheral edge of the first portion 71 of the insulating layer 364. Considering that the light beam collected by the lens 24 has a conical shape centered on the optical axis L0, the transmission part 60 (circle C1) has a cross section of the light beam centered on the optical axis L0 as described above. It is formed in a circular shape similar to the shape.

  On the other hand, FIG. 6 shows a circle C2 having a radius R that is concentric (center P) with the circle C1 of the transmission part 60 and exceeds the radius r of the circle C1. The circle C2 corresponds to the outer peripheral edge of the first portion 71 of the insulating layer 364. That is, the difference between the radius R and the radius r corresponds to the width of the first portion 71 of the insulating layer 364. A part of the periphery of the light emitting unit 50 is an arc of a circle C2. That is, as shown in FIG. 6, the light emitting unit 50 connects the arcs of the respective circles C <b> 2 concentric with each of the four transmission units 60 (circle C <b> 1) positioned around the light emitting unit 50. It is formed in a substantially cross shape defined by the periphery of the second portion 72. As understood from the above description, a part of the periphery of the light emitting unit 50 in the first embodiment has a shape along the periphery (circle C1) of the transmission unit 60 in plan view.

  FIG. 7 is a plan view for explaining the effect of the first embodiment. In FIG. 7, the light emitting unit 50 </ b> A that is proportional to the first embodiment is illustrated by a broken line so as to overlap the light emitting unit 50 and the transmission unit 60 of the first embodiment. As shown in FIG. 7, rectangular light emitting portions 50 </ b> A are formed so as not to overlap each transmission portion 60 in a plan view in comparison. That is, the peripheral edge of the proportional light emitting part 50 is linear, and is not in a shape along the circular peripheral edge of the transmission part 60 in plan view. As understood from FIG. 7, the light emitting unit 50 according to the present embodiment has a shape in which a part of the periphery thereof is along the periphery of the transmission unit 60 in plan view, and thus has a rectangular light emission in plan view as compared with the light emitting unit 50. The area of the light emitting unit 50 is enlarged as compared with the case of forming the portion. Therefore, it is possible to use a sufficient amount of light for illumination of the subject 200 as compared with the comparative example.

Second Embodiment
A second embodiment of the present invention will be described below. In addition, about the element which an effect | action and a function are equivalent to 1st Embodiment in each aspect illustrated below, each reference detailed in description of 1st Embodiment is diverted, and each detailed description is abbreviate | omitted suitably.

  FIG. 8 is a plan view of the illumination unit 30 in the second embodiment, and FIG. 9 is a cross-sectional view taken along the line IX-IX in FIG. As shown in FIG. 8, in the second embodiment as well, in the same manner as in the first embodiment, the plurality of first electrode layers 363 (the plurality of light emitting units 50) are arranged in a matrix along the X direction and the Y direction. To do.

  As shown in FIGS. 8 and 9, the wiring layer 35 of the second embodiment includes a plurality of wirings 351 extending in the X direction. Each wiring 351 is formed on the surface 321 of the substrate 32 at a predetermined interval in the Y direction in plan view. Specifically, each wiring 351 is formed linearly in a region sandwiched in plan view by the transmission parts 60 adjacent to each other in the Y direction. Therefore, as shown in FIG. 8, each wiring 351 overlaps with the plurality of first electrode layers 363 arranged in the X direction in a plan view and does not overlap with each transmission part 60. The plurality of wirings 351 are commonly connected to a power supply line to which a predetermined potential is supplied, for example, at one end or both ends of each.

  Also in the second embodiment, each first electrode layer 363 is electrically connected to each wiring 351 through a contact hole 353. Specifically, a plurality of first electrode layers 363 arranged in the X direction are commonly connected to any one wiring 351 extending in the X direction. As understood from the above description, in the second embodiment, a current is supplied to the wiring 351 that supplies current to each light emitting unit 50 in an arbitrary row arranged in the X direction, and to each light emitting unit 50 in the other row. Wirings 351 to be supplied are formed at intervals.

  By the way, there is a possibility that the first electrode layer 363 and the second electrode layer 366 of the light emitting unit 50 may be electrically short-circuited due to, for example, a film formation failure (insufficient film thickness or defect) of the light emitting layer 365 or aged deterioration. is there. Since the second electrode layer 366 is continuous over the plurality of light emitting units 50, the first electrode layer 363 and the second electrode layer 366 are short-circuited with each other in one light emitting unit 50, and the potential difference therebetween is reduced ( Accordingly, when the current supplied to the light emitting layer is reduced), the light emitting amount of the surrounding light emitting units 50 may be decreased in addition to the single light emitting unit 50.

  In the configuration (for example, the first embodiment) in which the wirings 351 are formed in a lattice shape in which a plurality of portions extending in the X direction and a plurality of portions extending in the Y direction cross each other, one light emitting unit 50 is formed. Due to the short circuit between the first electrode layer 363 and the second electrode layer 366, the light emission amount of the surrounding light emitting unit 50 in both the X direction and the Y direction around the light emitting unit 50 decreases. That is, the influence of a short circuit in one light emitting unit 50 affects both the X direction and the Y direction.

  On the other hand, in the second embodiment, a plurality of wirings 351 extending in the X direction are formed at intervals in the Y direction. Therefore, the range in which the light emission amount of each light emitting unit 50 decreases due to a short circuit between the first electrode layer 363 and the second electrode layer 366 in one light emitting unit 50 is limited in the X direction. Are not affected by the short circuit in the range where the positions in the Y direction are different (each light emitting unit 50 connected to the wiring 351 different from the light emitting unit 50 in which the short circuit has occurred). That is, according to the second embodiment, the expansion of the range in which the light emission amount of each light emitting unit 50 decreases due to the short circuit between the first electrode layer 363 and the second electrode layer 366 in one light emitting unit 50 is suppressed. There is an advantage of being.

<Modification>
Each of the above-described embodiments can be variously modified. Specific modifications are exemplified below. Two or more aspects arbitrarily selected from the following examples can be appropriately combined.

(1) Each element illustrated with the above-mentioned form may be abbreviate | omitted suitably. For example, the light shielding layer 33 and the plurality of lenses 24 can be omitted. Moreover, the positional relationship of each element illustrated by the above-mentioned form can be changed suitably. For example, in the above-described embodiment, the top emission type light emitting element is formed as the light emitting unit 50. However, if the bottom emission type light emitting element is used as the light emitting unit 50, the light source unit 36 is formed on the surface 322 of the substrate 32. Is also possible. A configuration in which each lens 24 is disposed between the light source unit 36 and the light receiving unit 10 may be employed. It is also possible to interpose any other element between the elements exemplified in the above embodiment.

(2) In each of the above-described embodiments, a configuration in which a plurality of light emitting units 50 that are spaced apart from each other in a plan view is arranged in a matrix is illustrated, but the light emitting units 50 are continuous over the entire area of the light source unit 36 (for example, the insulating layer 364 It is also possible to omit the second portion 72 of FIG. Similarly, the configuration in which the plurality of transmission parts 60 are arranged in a matrix can be changed as appropriate.

(3) In the above-described embodiment, the imaging apparatus 100 (vein sensor) that captures a biometric authentication vein image is illustrated, but the application of the present invention is arbitrary. For example, the medical device such as an alcohol detection device that estimates a blood alcohol concentration from a vein image of a living body imaged by the imaging device 100 or a blood glucose level estimation device that estimates a blood glucose level from a vein image of the living body imaged by the imaging device 100. The present invention can also be applied. A known technique can be arbitrarily employed for estimation of blood alcohol concentration using the imaging result and estimation of blood glucose level using the imaging result. The present invention can also be applied to an image reading apparatus that reads an image from a printed material. Note that when the present invention is applied to an image reading apparatus, visible light is suitably used as imaging light.

(4) In each of the above-described embodiments, the embodiment in which the present invention is applied to the imaging apparatus has been illustrated. However, the present invention can be realized as an illumination apparatus that illuminates an arbitrary object (illuminated body). The illumination device is disposed between the observer and the object to be illuminated. Specifically, the illumination device includes a light source unit 36 in which a light emitting unit 50 that irradiates light to an object to be illuminated and a transmission unit that transmits light arriving from the object to be illuminated to the viewer side are arranged in a planar shape. It has. As in the above-described embodiments, the periphery of each light emitting unit 50 has a shape along the periphery of the transmission unit 60 in plan view.

  The illumination device of the present invention is suitably used as a light source (front light) that illuminates display devices of various electronic devices, for example. Examples of electronic devices that can use the lighting device of the present invention include a television, a computer, a mobile phone, a portable information terminal, a game device, electronic paper, a digital still camera, a video camera, and a car navigation device. However, the use of the illumination device of the present invention is not limited to illumination of a display device. For example, the present invention can be used as a portable illumination device (flashlight) that illuminates an arbitrary object to be illuminated. An observer arrange | positions an illuminating device (light source part) in the near side of a to-be-illuminated body, and visually recognizes to-be-illuminated body through an illuminating device. In addition, in the illuminating device of this invention illustrated above, the presence or absence of the condensing part 20 and the light shielding layer 33 is not ask | required.

DESCRIPTION OF SYMBOLS 100 ... Imaging device, 200 ... Subject, 10 ... Light receiving part, 12 ... Substrate, 14 ... Light receiving element, 18 ... Adhesive, 20 ... Condensing part, 22 ... Substrate, 24 ... Lens , 30 .. Illumination part, 32 .. substrate, 33 .. light-shielding layer, 34 .. opening part, 35 .. wiring layer, 351 .. wiring, 352 .. insulating layer, 353. Light source section, 361 ... reflective layer, 362 ... insulating layer, 363 ... first electrode layer, 364 ... insulating layer, 365 ... light emitting layer, 366 ... second electrode layer, 37 ... protective layer, 50 ... Light-emitting part, 60 ... Transmission part, 71 ... First part, 72 ... Second part

Claims (6)

A light receiving section in which a plurality of light receiving elements are arranged;
A light source unit disposed between the light receiving unit and the subject,
In the light source unit, a light emitting unit that irradiates light to the subject and a transmission unit that transmits light arriving from the subject to the light receiving unit side are arranged in a plane,
At least a part of the periphery of the light emitting unit has a shape along the periphery of the transmission unit in plan view. The light source unit includes a plurality of the transmission units,
The imaging device according to claim 1, wherein at least a part of the periphery of the light emitting unit has a shape along the periphery of each of the plurality of transmission units located around the light emitting unit. The perimeter of the transmission part is circular,
A part of the periphery of the light emitting part has an arc shape concentric with the periphery of the transmission part.
The imaging device according to claim 1 or 2. The imaging apparatus according to claim 1, further comprising a condensing unit that condenses light coming from the subject and emits the light to the light receiving unit side. In the light source unit, a plurality of the light emitting units are arranged in a planar shape,
5. The imaging device according to claim 1, wherein a wiring for supplying current to one of the light emitting units and a wiring for supplying current to the other light emitting unit are formed with a space therebetween. A light source unit that irradiates light and a light transmission unit that transmits light are provided in a planar shape, and a light source unit is provided.
At least a part of the periphery of the light emitting unit has a shape along the periphery of the transmission unit in plan view.

Images