Abstract: The apparatus in accordance with the present invention detects locations of opposite ends of a running strip in a width-wise direction and heights of the ends. The apparatus includes a first light-source irradiating a light onto a lower surface of a strip, a second light-source perpendicularly irradiating a linear light onto an upper surface of the strip, a camera taking a photo of the strip, and a calculation unit calculating locations of opposite ends of the strip in width-wise and height-wise directions thereof, based on an image resulted from a light irradiated from the first light-source and an image resulted from a light irradiated from the second light-source and reflected at the strip.

Abstract: A glass substrate for a reflective mirror of a rear projection television (RPTV) which ensures display quality by quantitative control, and can reduce control cost and manufacture cost is provided. A reflective mirror 3 of the rear projection television (RPTV) includes a float glass plate (glass substrate) 1 formed to have a plate thickness of 3 mm by a float process, and a reflection enhancing film 2 constituted of aluminum (Al) formed on one surface 1a of the glass substrate 1 by a sputtering method. In the measurement condition of a cut-off value of 0.8 to 8 mm, the maximum amplitude of a filtered waviness curve is 0.1 ?m or less, the maximum value of a viewability index value ? (=A/D3) in a range of spatial frequencies 2 to 500/mm by spectral analysis of the filtered waviness curve is 0.02 (/m2) or less, and an integral value of the viewability index value ? is 2.0 (/m3) or less.

Abstract: A rod-shaped light guide which does not cause unevenness in color at the portion near an incident face is produced by injection-molding transparent resin such as acryl and its surfaces include a light-emitting surface, a bottom face, left and right sides and end faces. One end face opposes a light emitting unit, and light scattering patterns for scattering light incident from the end face are formed on the bottom face. The light scattering patterns are different in shape between a portion near the end face as the incident face and a portion away from the end face.

Abstract: A glass substrate for a reflective mirror of a rear projection television (RPTV) which ensures display quality by quantitative control, and can reduce control cost and manufacture cost is provided. A reflective mirror 3 of the rear projection television (RPTV) includes a float glass plate (glass substrate) 1 formed to have a plate thickness of 3 mm by a float process, and a reflection enhancing film 2 constituted of aluminum (Al) formed on one surface 1a of the glass substrate 1 by a sputtering method. In the measurement condition of a cut-off value of 0.8 to 8 mm, the maximum amplitude of a filtered waviness curve is 0.1 ?m or less, the maximum value of a viewability index value ? (=A/D3) in a range of spatial frequencies 2 to 500/mm by spectral analysis of the filtered waviness curve is 0.02 (/m2) or less, and an integral value of the viewability index value ? is 2.0 (/m3) or less.

Abstract: A rod-shaped light guide which does not cause unevenness in color at the portion near an incident face is produced by injection-molding transparent resin such as acryl and its surfaces include a light-emitting surface, a bottom face, left and right sides and end faces. One end face opposes a light emitting unit, and light scattering patterns for scattering light incident from the end face are formed on the bottom face. The light scattering patterns are different in shape between a portion near the end face as the incident face and a portion away from the end face.

Abstract: An improved illumination device shortens a redundant area of insufficient light intensity close to a longitudinal end thereof. The device includes a casing, a bar-shaped light guide housed in the casing to cause a light-emitting surface thereof to be exposed, a light-emitting unit secured to an end section of the casing, wherein light from the light-emitting unit is introduced into the bar-shaped light guide through the end face thereof and is totally reflected within the bar-shaped light guide to be emitted through the light-emitting surface, and a shielding section provided to cover an end section of the bar-shaped light guide including the redundant area at the end section of the casing close to the light-emitting unit.

Abstract: The present invention provides a light guide, a line-illuminating device, and an image-scanning device that provide excellent uniformity in the amount of light produced. A light-reflecting portion comprised of spherical concave surfaces becomes a reflecting surface having spherical convex surfaces when it is seen from the inside of the light guide. Even when the incident angle of light from the light source unit is slightly offset, the reflection angle in spherical convex surfaces significantly changes, and light is reflected uniformly toward the upper surface serving as a light-emitting surface. In particular, when the fine spherical concave portions of the light-reflecting portion have a small depth, the incident light from the end surface is reflected toward the upper surface, serving as a light-emitting surface, and both side surfaces without reflecting back to the light-emitting unit side, so that uniform reflection can be achieved.

Abstract: The present invention provides a light guide, a line-illuminating device, and an image-scanning device that provide excellent uniformity in the amount of light produced. A light-reflecting portion comprised of spherical concave surfaces becomes a reflecting surface having spherical convex surfaces when it is seen from the inside of the light guide. Even when the incident angle of light from the light source unit is slightly offset, the reflection angle in spherical convex surfaces significantly changes, and light is reflected uniformly toward the upper surface serving as a light-emitting surface. In particular, when the fine spherical concave portions of the light-reflecting portion have a small depth, the incident light from the end surface is reflected toward the upper surface, serving as a light-emitting surface, and both side surfaces without reflecting back to the light-emitting unit side, so that uniform reflection can be achieved.

Abstract: A light guide, a line-illuminating device, and an image-scanning device are provided which are excellent in uniformity of the light amount. A light-reflecting portion comprised of tubular concave surfaces becomes a reflecting surface having tubular convex surfaces when seen from the inside of the light guide. With such structure, even when the incident angle of light from a light source unit slightly displaces, the reflection angle in the tubular convex surfaces significantly changes. In an irregular surface having a triangular shape, as in a conventional example, the incident angle becomes almost uniform in the area far from the light source unit, and thereby the reflection angle also becomes uniform. Consequently, it is difficult to achieve uniform reflection in the main-scanning direction. However, with the tubular concave surfaces, light is reflected uniformly toward the upper surface as a light-emitting surface.

Abstract: An illumination device includes a casing, a bar-shaped light guide housed in the casing to expose a light-emitting surface thereof, a light-emitting unit secured to an end section of the casing, wherein light from the light-emitting unit is introduced within the light guide through an end face thereof and then totally reflected within the light guide to be emitted through the light-emitting surface, a shielding section which covers an end section of the light guide at the end section of the casing close to the light-emitting unit and is provided on the light-emitting surface side of the light guide, a notch is formed at an end of the light guide on the light-emitting surface side close to the light-emitting unit, and light from the light-emitting unit is reflected on a rear surface of the shielding section through a gap between the notch and the light-emitting unit to be introduced into the light guide.

Abstract: A light guide, a line-illuminating device, and an image-scanning device are provided which are excellent in uniformity of the light amount. A light-reflecting portion comprised of tubular concave surfaces becomes a reflecting surface having tubular convex surfaces when seen from the inside of the light guide. With such structure, even when the incident angle of light from a light source unit slightly displaces, the reflection angle in the tubular convex surfaces significantly changes. In an irregular surface having a triangular shape, as in a conventional example, the incident angle becomes almost uniform in the area far from the light source unit, and thereby the reflection angle also becomes uniform. Consequently, it is difficult to achieve uniform reflection in the main-scanning direction. However, with the tubular concave surfaces, light is reflected uniformly toward the upper surface as a light-emitting surface.