1. An illumination aperture diaphragm in a light source device for supplying illumination light to a subject for use when a subject image formed by reflected illumination light in a visible light region and a fluorescence image from fluorescent substance in a subject are simultaneously observed,
the illumination aperture diaphragm comprising an annular filter region formed on a base material and an aperture region formed inside the filter region, the filter region serving to transmit light in a wavelength region of excitation light for allowing the subject to emit fluorescent light and serving to reduce or block the transmission of light in a visible light region for forming the subject image.
2. The illumination aperture diaphragm according to claim 1, wherein the excitation light is infrared light.
3. The illumination aperture diaphragm according to claim 2, wherein the base material is flat, plate-like with the annular filter region formed on one surface of the base material and with the other surface of the base material being provided entirely with a filter layer which blocks the transmission of light in the wavelength region of the fluorescent light.
4. A light source device to be used for an imaging device for simultaneously observing a subject image formed by illumination light and a fluorescence image from a portion of a subject being observed, the light source device comprising a white light source and the illumination aperture diaphragm according to claim 1.
5. The light source device according to claim 4, wherein the light source device is used for an endoscope device.
6. The illumination aperture diaphragm according to claim 1, wherein the aperture diaphragm has a surface provided entirely with a filter layer which blocks the transmission of light in the wavelength region of the fluorescent light.
7. An illumination aperture diaphragm to be used in a light source device when a subject image formed by reflected illumination light in a visible light region and a fluorescence image from a fluorescent substance in a subject are simultaneously observed,
the illumination aperture diaphragm comprising a plurality of diaphragm blade members each having a surface partially or entirely formed with a filter portion, and having a filter region which is formed of the filter portions of the plurality of diaphragm blade members and an aperture region located inside the filter region, the filter region serving to transmit light in a wavelength region of excitation light for allowing the subject to emit fluorescent light and serving to reduce or block the transmission of light in a visible light region for forming the subject image.
8. The illumination aperture diaphragm according to claim 7, wherein the aperture region has a variable area.
9. The illumination aperture diaphragm according to claim 8, wherein the excitation light is infrared light.
10. The illumination aperture diaphragm according to claim 9, wherein the filter region has a diameter greater than a diameter of an optical path from a light source, at a position at which the illumination aperture diaphragm is mounted, and the filter region does not block the optical path.
11. A light source device to be used for an imaging device for simultaneously observing a subject image formed by illumination light and a fluorescence image from a portion of a subject being observed, the light source device comprising a white light source and the illumination aperture diaphragm according to claim 7.
12. The light source device according to claim 11, wherein the light source device is used for an endoscope device.
13. The illumination aperture diaphragm according to claim 7, wherein the excitation light is infrared light.
14. The illumination aperture diaphragm according to claim 7, wherein the filter region has a diameter greater than a diameter of an optical path from a light source, at a position at which the illumination aperture diaphragm is mounted, and the filter region does not block the optical path.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A planar light source apparatus comprising:
a light guide plate;
a light source arranged on a side face of the light guide plate;
a mounting substrate on which the light source is mounted; and
a frame body that holds the light guide plate,
wherein the frame body has a plurality of projection portions on an inner side of the frame body,
wherein the light source is arranged between the projection portions,
wherein the frame body, the mounting substrate, and the light guide plate are fixed via a fixing member,
wherein the light source has a pair of electrode terminals,
wherein the mounting substrate has a land portion on which the electrode terminals are mounted,
wherein connection portions are provided by which the electrode terminals and the land portion are electrically connected,
wherein the projection portions have a thickness defined by a surface on the mounting substrate side and an opposite surface relative thereto, and
wherein each of the projection portions is formed such that, in a cross-section of at least a portion of the projection portion viewed in a projecting direction of the projection portion in a vicinity of the connection portions, the height or the width of the projection portion is smaller than the highest height or the highest width of the projection portion from the surface of the projection portion on the mounting substrate side toward the opposite surface.
2. The planar light source apparatus according to claim 1,
wherein a plurality of the light sources are provided, and
wherein, in each of the projection portions located between the connection portions, the width of the surface that comes into contact with the substrate via the fixing member is the smallest in the projection portion.
3. The planar light source apparatus according to claim 1, wherein each of the projection portions is formed such that, in a cross-section of at least a portion of the projection portion viewed in the projecting direction of the projection portion, only the width of the projection portion is smaller than the highest width of the projection portion.
4. The planar light source apparatus according to claim 1,
wherein tips of the projection portions and the light guide plate oppose each other, and
wherein each of the projection portions is formed such that the width of a cross-section of the tip of the projection portion is larger than the cross-section of at least a portion of the projection portion as viewed in the projecting direction of the projection portion in which the highest height or the highest width of the projection portion is smaller than the highest width of the projection portion from the surface of the projection portion on the mounting substrate side toward the opposite surface.
5. The planar light source apparatus according to claim 1, wherein the height or the width of the projection portion at the tip of the projection portion is smaller than the highest height or the highest width of the projection portion from the surface of the projection portion on the mounting substrate side.
6. The planar light source apparatus according to claim 1, wherein as viewed in the projecting direction of the projection portions, at least a portion of a cross-sectional shape of the projection portions is T-shaped.
7. The planar light source apparatus according to claim 1, wherein as viewed in the projecting direction of the projection portions, at least a portion of a cross-sectional shape of the projection portions is trapezoidal.
8. The planar light source apparatus according to claim 1, wherein as viewed in the projecting direction of the projection portions, a portion of the contour of a cross-sectional shape of the projection portions includes a curved line.
9. The planar light source apparatus according to claim 1,
wherein tips of the projection portions and the light guide plate oppose each other,
wherein the fixing member is arranged so as to span the projection portions and the light guide plate, and
wherein the thickness of the projection portions and the thickness of the light guide plate are the same thickness at the opposing surfaces.
10. The planar light source apparatus according to claim 1, wherein an area of each of the projection portions on the mounting substrate side is smaller than the area of the opposite surface relative thereto.
11. The planar light source apparatus according to claim 1, wherein an area of a shape of portions of the fixing member arranged over the projection portions is smaller than or equal to the area of the projection portions.
12. A display apparatus comprising the planar light source apparatus according to claim 1.
13. An electronic device comprising the planar light source apparatus according to claim 1.
14. The planar light source apparatus according to claim 2, wherein an area of a shape of portions of the fixing member arranged over the projection portions is smaller than or equal to the area of the projection portions.
15. The planar light source apparatus according to claim 3, wherein an area of a shape of portions of the fixing member arranged over the projection portions is smaller than or equal to the area of the projection portions.
16. The planar light source apparatus according to claim 4, wherein an area of a shape of portions of the fixing member arranged over the projection portions is smaller than or equal to the area of the projection portions.
17. The planar light source apparatus according to claim 5, wherein an area of a shape of portions of the fixing member arranged over the projection portions is smaller than or equal to the area of the projection portions.
18. The planar light source apparatus according to claim 6, wherein an area of a shape of portions of the fixing member arranged over the projection portions is smaller than or equal to the area of the projection portions.
19. The planar light source apparatus according to claim 7, wherein an area of a shape of portions of the fixing member arranged over the projection portions is smaller than or equal to the area of the projection portions.
20. The planar light source apparatus according to claim 8, wherein an area of a shape of portions of the fixing member arranged over the projection portions is smaller than or equal to the area of the projection portions.