Nippon Sheet Glass Company, Limited

Tomihisa Saito

Takashi Kishimoto

Hidemitsu Takeuchi

Takeshi Ishimaru

Hiroyuki Nemoto

Makoto Ikeda

Yoshiyuki Uemura

Hirohiko Iwase

Satoshi Furusawa

Takahiro Hashimoto

Yukihiro Kato

Masafumi Taguchi

Haruo Matsumoto

Hideki Azuma

Kozo Fujimura

An electronic component capable of effectively dissipating heat generated in an LED chip and other elements is provided. A light emitting unitincludes a substratemade of copper or aluminum, an insulating layerformed on the surface thereof, a circuit patternformed on the insulating layer, and a circuit patternformed on the substratethrough an openingthat has been formed in advance in the insulation layer. An LED chipis mounted on the circuit patternsandby using solder. The LED chipincludes a ceramic substrate, electrodesandformed thereon, and an LED dieas a light emitting portion disposed on the electrode, which is one of the electrodes. Terminalsandare provided on the upper surface of the LED die. The terminal, which is one of the terminals, is connected to the electrodevia a bonding wire, and the terminal, which is the other one of the terminals, is connected to the electrodevia a bonding wire

Electronic component, illuminating device, contact-type image sensor, and image reading device having no short circuit condition achieved by allowing only one electrode of an LED chip in direct contact with a metallic substrate

A rod- or plate-shaped light guide includes a first end that receives illuminating light incident thereon, a bottom surface having a reflecting portion thereon for reflecting the light, an emitting face which emits the reflected light, and a protruding portion protruding longitudinally and continuously from the light guide at a second end thereof. The protruding portion has a reduced peripheral dimension compared to a peripheral dimension of an adjacent portion of the light guide, and a reflective body is provided on the protruding portion and covers a longitudinal end face of the protruding portion extending perpendicular to the emitting face. When viewed along an axial direction of the light guide, the reflective body does not jut out from an end face of the light guide even when the body wraps on to a side surface of the protruding portion or expansion occurs.

Light guide having reflective protruding portion, and lighting devices including such light guide

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. The light scattering patterns formed at the portion near the incident face are composed of a large number of fine hemispherical concaves, whereas the light scattering patterns at the portion away from the incident face are composed of triangular grooves or half cylindrical grooves, and the axial direction of these triangular grooves or half cylindrical grooves coincides with the width direction (sub-scanning direction) of the bottom face on which the patterns are formed.

Light guide having light scattering patterns with different light reflected directions

A structure of a line lighting device permits a rod-like light guide to be attached to a case without rubbing against the case. An end portion of the rod-like light guide provided with a pin is inserted into an opening in a case main body and pushed down, thus making the pin engage with a recess in the case main body. At this time, a distal end of the rod-like light guide is inserted, to some extent, into an opening in a light emitting unit fixing portion. Subsequently, the rod-like light guide is pushed down and pivoted around the pin so as to be completely contained within the case main body. In this state, the distal end of the rod-like light guide is fitted into the opening and the end face of the rod-like light guide is flush with the outer side face of the light emitting unit fixing portion.

Line lighting device and image reading device

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. A notch is formed at the end section of the bar-shaped 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 this notch and the light-emitting unit to be introduced into the bar-shaped light guide.

Illumination device and image scanning device

A bar-shaped light guide is provided to allow its emitting surface to be exposed from a white casing and is provided with a pattern for scattering and reflecting the light on a bottom surface opposite to the emitting surface. This pattern is formed by a white paint or minute irregularities. Further, an end face of the bar-shaped light guide opposite to the incident side is made cube-corner shaped. In other words, the end face is made chevroned by mirror-finished flat surfaces. These flat surfaces are tilted at such an angle that an incident angle &#x3b8; of the rays of light traveling through the bar-shaped light guide parallel to the longitudinal direction of the bar-shaped light guide is smaller than a critical angle.

Bar-shaped light guide, illumination unit and image-scanning device

A line-illuminating device which is resistant to shrinkage problems caused by repetition of heating and cooling includes a white casing made of polycarbonate or the like, a light guide made of an acrylic resin or the like and accommodated in the casing such that the light-emitting surface thereof is exposed, and light-emitting elements (for example, light-emitting diodes) as a light source provided on both ends of the casing so as to abut against the end surfaces of the light guide without a gap. The casing is divided into two portions in the longitudinal direction, and a gap is formed between the two divided portions. With this gap, even if the light guide shrinks due to repetition of heating and cooling, the divided portions can effectively shrink together with the light guide via the gap, and the abutting state between the end surface of the light guide and the light-emitting element can be maintained.

Line illuminating device and image-scanning device incorporating line-illuminating device

A light guideof a rectangular cross-section has side facesincluding short sides in the longitudinal direction of which one side faceis provided with a light-scattering pattern, formed by screen-printing in white paint, for scattering the light incident to the light guide. The other side facefacing the side faceis exposed from a casingto serve as a light-emitting surface. In the present embodiment, it is possible to secure a sufficient amount of light because the whole area of the side face is used as the light-emitting surface. The remaining side facesof the light guideare side faces including the long sides. Since the side faceseasily produce a surface sink during molding, neither the light-scattering patternnor the light-emitting surface is provided thereon.

Line-illuminating device and image sensor

A light-emitting unithas a light-emitting unit boardmade of resin provided with a lead frame. The light-emitting unit boardis also provided with an open windowfor mounting a light-emitting device. The lead framecomprises a lead terminal section, an inner lead section, and a light-emitting device mounting and connecting sectionwhich is exposed within the open windowThe light-emitting devices, andare bonded with the light-emitting device mounting and connecting section, and electrodes of the light-emitting devices and the lead frame are connected by a metal wire, wherein the open windowis sealed by transparent resin. The lead frameis made of iron-containing copper to improve heat radiation performance of the light-emitting unit board. By increasing maximum current to be supplied to the light-emitting diodes, it is possible to increase illumination brightness and to attain speedup of image reading.

Light-emitting unit and illumination device and image reading device using light-emitting unit

A line-illuminating device having a light guide of which the cross-sectional shape is rectangular and its one corner is chamfered to form an emission plane is provided, in which the light guide is housed in a light guide casing wherein the chamfer dimension of the emission plane is more than 40% of a height dimension of the light guide By enlarging the chamfer dimension and broadening the width of the emission plane the directional characteristics of the emitted light is expanded. In this manner, it is possible to reduce the extent of decrease in the quantity of illuminating light on a document surface when the document surface is elevated.

Line-illuminating device

A line type illuminator comprising a plurality of light sources at a side of one end of a rod-like transparent light guide, wherein an auxiliary light scattering pattern is formed with two (2) spot-like patterns, which are provided at positions being shifted from a center line of a main light scattering pattern in the longitudinal direction and are separate in a width direction, for maintaining evenness or uniformity of illumination intensity in a longitudinal direction. Normal lines of those two (2) spot-like patterns and the center line of any one of the plurality of light sources, extending in the longitudinal direction, intersect each other. Specifically, the longitudinal center lines of the red-color light sources and the green-color light source intersect the respective normal lines of the spot-like patterns and

Line type illuminator

In a line illumination device, a light source is provided at one end of a rod-like transparent light guiding member, for maintaining high and uniform illuminance, and the shape of a light scattering pattern 11 has: a first portion 11a gradually increasing in area from one end to the other end thereof; a second portion 11b continuous with the first portion 11a and increasing in area in the direction towards the other end at a higher rate than that of the first portion; and a third portion 11c continuous with the second portion 11b and extending towards the other end at a maximum width of the second portion 11b.

Growing community of inventors

Tokyo, Japan

Tomihisa Saito