TWI567340B - A light source device using a point light source, and an illumination device for an optical reader using the same - Google Patents

Description

Linear light source device using point light source and illumination device for optical reader using the same Field of invention

The present invention relates to a linear light source device, and more particularly to a linear light source device and an illumination device for an optical reader using the same, the linear light source device being a point light source having strong light source direction characteristics And the spot light emitted from the point light source forms a linear light and emits light.

Background of the invention

In recent years, the research and development of light-emitting diodes (hereinafter referred to as "LEDs") has advanced by leaps and bounds. Various types of LEDs have been developed and manufactured, and have been used in a wide range of fields, even in the field of lighting. More use. In the field of illumination, in addition to applications such as replacing fluorescent lamps and light bulbs, it is also possible to use, for example, a light source of an image sensor in an optical reader.

However, when the LED is compared with a fluorescent lamp or a halogen lamp, the direction characteristic of the light is strong, and the light amount distribution of the light-irradiated portion is unevenly formed only when the LED is separately disposed, and the image reading is difficult. Therefore, in order to make the light amount distribution of the light-irradiated portion uniform, various efforts are made.

For example, Patent Document 1 discloses an invention of an image reading apparatus and an image forming apparatus. The invention of the image reading apparatus arranges a plurality of LEDs along the main scanning direction, and diffuses between the LED and the original glass table. The member is a device that uniformly distributes and diffuses the amount of light of the LED lamp in the main scanning direction. The image sensor used in the image reading apparatus will be described using FIG. Light emitted from the LED 22 passes through the diffusion member 24 When the convex lens-shaped diffusing portion 24a converges, it diffuses and illuminates the document C to reflect light, and the grating receives light. As described above, the LED 22 emits light even if the light is diverged less, but the light is evenly radiated by the diffusion portion to illuminate the original.

Moreover, in the following patent document 2, the invention of the linear light source unit is described. The invention of the linear light source unit is composed of a translucent resin rod provided with a mirror on one end surface, and a diffusion stripe on a peripheral surface of the translucent resin rod to have a high refractive index diffused reflector. The lens is attached in the form of a straight stripe in the axial direction; and the light source is provided on the other end surface of the translucent resin rod so as to be integral with the rod. If the distance from the light source is farther, the amount of light will decrease. Therefore, in order to make the brightness of the light-irradiated surface uniform, diffusion streaks are provided on the resin rod. As shown in Fig. 9, the width of the diffusion stripe 61 provided in the linear light source device 6 is wider as the distance from the light source 62 is farther. By using the device, the number of point light sources for the linear light source device can be reduced, and energy can be saved.

Conventional technical literature Patent literature

Patent Document 1 Japanese Patent Laid-Open Publication No. 2008-271158

Patent Document 2 Japanese Unexamined Patent No. 6-21940

Summary of invention

However, since the number of LEDs used in the light source device described in Patent Document 1 is increased, the amount of heat generation is large, and it is difficult to reduce the weight and read. It is difficult to speed up. Further, in the point light source unit described in Patent Document 2, since the LED is attached to the end, the length of the resin rod depends on the LED power, that is, if the LED power is low, only the short-distance illumination can be performed.

In view of the above problems, the inventors of the present invention have developed a linear light source device in which a plurality of point light sources are arranged at equal intervals at a certain distance, and light emitted from each point light source is converted into a linear light source, thereby providing uniformity. The linear illumination light can further correspond to linear illumination of various lengths.

An object of the present invention is to provide a lightweight linear light source device which uses a point light source having a strong directivity and can convert light emitted from a point light source into a linear light source without sealing the LED with a resin or the like.

In order to achieve the above object, a linear light source device according to the present invention includes: a point light source; and a casing formed by a bottom portion having a hole for arranging the point light source and having a long side and a short side a long side portion having a predetermined length perpendicularly formed from a long side of the bottom portion; a short side portion having a predetermined length perpendicularly formed from a short side of the bottom portion; the light guiding reflector is The short side surface portion and the long side surface portion supporter are characterized in that the light guiding reflector is formed by a plate-like body provided with a center centered on the optical axis of the point light source. Reflecting the light guiding portion, and providing an outer reflecting light guiding portion around the central reflecting light guiding portion, and having a light irradiation direction attached to one of the long side surface portions The adjustment unit; the respective illumination direction adjustment units are attached at a predetermined angle so as to approach each other as they move away from the bottom surface portion.

Further, in the linear light source device of the present invention, the predetermined angle is attached at an angle of 45 to 60 degrees with respect to the optical axis of the point light source.

Moreover, in the linear light source device of the present invention, the outer reflection light guiding portion has a plurality of rectangular holes, and the length of the side parallel to the short side is constant.

Further, in the linear light source device of the present invention, the point light source is a light-emitting diode or a laser diode.

Further, in the linear light source device of the present invention, the shape of the light irradiation direction adjusting portion is a curved plate-like body.

Moreover, in the linear light source device of the present invention, the long side surface portion of the casing has an arc shape.

Further, in the linear light source device of the present invention, the casing, the light guiding reflector, and the light irradiation direction adjusting portion are formed by an ultrafine foaming light reflecting member.

Further, in the linear light source device of the present invention, a diffusion sheet or a diffusion plate that diffuses light is attached to an opening portion of the light irradiation direction adjusting portion.

Moreover, in the linear light source device of the present invention, the light irradiation direction adjusting portion is formed integrally with the casing.

Further, in order to achieve the above object, the present invention is used for optical reading A linear illumination device according to any one of the preceding claims, characterized in that the linear light source device, the mounting table and the concentrating device according to any one of the above aspects are provided, and a reflector is provided in such a manner as to be irradiated by the linear light source device The light reflected by the stage is concentrated toward the concentrating device.

According to the linear light source device of the present invention, the light from the point light source, which is converted into a uniform linear light source by the light guiding plate, can be converted into a uniform brightness line of a desired thickness by the light irradiation direction adjusting portion. Illumination to illuminate the desired direction.

When the angle of the optical axis with respect to the point light source is less than 45 degrees, the reflected light from the point light source is concentrated at the connection portion between the side wall portion and the irradiation direction adjusting portion, and the light use efficiency is lowered. Further, if the angle with respect to the optical axis of the point light source is more than 60 degrees, the height of the linear light source device becomes too high, and the setting range of the linear light source device must be widely obtained.

By making the shape of the light guiding reflection hole into a shape of a rectangular hole whose length parallel to the short side is constant, the longitudinal direction of the illumination range and the direction of the light interference fringe formed by the light guiding reflection hole are Orthogonally, the shadow of the hole provided in the light guiding reflector becomes less likely to occur, and it is easy to form uniform illumination light. Moreover, the ratio of the opening portion can be increased as compared with the round hole.

Light-emitting diodes and laser diodes are well-known point sources with strong directional characteristics and strong luminous intensity. Therefore, with the linear light source device of the present invention, it is possible to obtain a linear light source device which is bright even if the size is large.

By forming the light irradiation direction adjusting portion into a curved shape, the connection portion between the side surface portion and the light irradiation direction adjusting portion is smoothly connected, and thus The reflected light of the point source will no longer have an undesired convergence in the direction of the connection portion, and the utilization efficiency of the light can be improved.

By forming the long side surface portion into an arc shape, not only linear illumination light but also curved illumination light can be provided.

The ultrafinely-foamed light-reflecting member can obtain homogeneous scattered light in all directions, for example, in comparison with the case where the light-scattering particles are dispersed by the plastic material. Therefore, with the linear light source device of the present invention, illumination light having a relatively uniform illuminance distribution can be obtained. Further, from the viewpoint of the lightweight of the ultrafine foamed light reflecting member, the weight of the linear light source device can be suppressed.

It becomes easier to homogenize the illumination light by installing a diffusion sheet or a diffusion plate.

According to the linear illumination device of the present invention, since linear illumination light having uniform brightness can be obtained, more vivid optical reading can be performed.

Simple illustration

Fig. 1A is a perspective view showing a linear light source device according to a first embodiment of the present invention, and Fig. 1B is a cross-sectional view taken along line IB-IB of Fig. 1A.

Fig. 2 is an exploded perspective view showing the linear light source device of the first embodiment of the present invention.

Fig. 3A is a plan view of a light guiding reflector used in the linear light source device according to Embodiment 1 of the present invention, and Fig. 3B is a modification of the light guiding reflector.

4A to 4F are cross-sectional views of a portion of the linear light source device of each modification corresponding to the portion of Fig. 1B.

5A is a perspective view of a linear light source device according to Embodiment 2 of the present invention, and FIG. 5B is a light guide reflection used by the linear light source device of Embodiment 2 of the present invention. Plan view of the board.

Fig. 6A is a perspective view showing a linear light source device according to a third embodiment of the present invention, and Fig. 6B is a side view showing a linear light source device according to a third embodiment of the present invention.

Fig. 7A is a plan view of an optical reading device according to a fourth embodiment of the present invention, and Fig. 7B is a cross-sectional view taken along line VIIB-VIIB of Fig. 7A.

8A and 8B are cross-sectional views of the image reading apparatus disclosed in Patent Document 1.

Fig. 9 is a perspective view of the linear light source unit disclosed in Patent Document 2.

Form for implementing the invention

Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings. The embodiment shown below is for exemplifying a linear light source device embodying the technical idea of the present invention, and is not intended to limit the present invention to those other, but other implementations included in the scope of patent application. The morphological things can also be adapted to the winner.

Example 1

First, a linear light source device according to a first embodiment of the present invention will be described with reference to Figs. 1A is a perspective view of a linear light source device according to Embodiment 1 of the present invention, and FIG. 1B is a cross-sectional view taken along line IB-IB of FIG. 1A; FIG. 2 is a line of Embodiment 1 of the present invention. 3A is a plan view of a light guiding reflector used in the linear light source device according to Embodiment 1 of the present invention, and FIG. 3B is a modification of the light guiding reflector.

The linear light source device 1 used in the present embodiment includes a point light source 2 having a strong directional characteristic, a rectangular casing 3 to which the spot light source 2 is mounted, and a light guiding reflector 4 And the light irradiation direction adjusting portions 5b and 5c. The point light source 2 uses an LED having one light-emitting element or a plurality of light-emitting elements.

The casing 3 has a long side and a short side, and is provided with a plurality of rectangular bottom portions 3a for mounting the holes 30 of the point light source 2, and long sides vertically defined by the long sides and the short sides of the bottom portion 3a. The side surface portions 3b and 3c and the short side surface portions 3d and 3e are formed, and an opening 3f is provided on a surface facing the bottom surface portion 3a. The opening 3f of the casing 3 is covered by the light guiding reflector 4, and the light guiding reflector 4 is fixed to the edge of the opening. The casing 3 and the light guiding reflector 4 can be formed separately, and the light guiding reflector 4 can be fixed at the opening edge of the casing 3. Further, a portion corresponding to the casing 3 and the light guiding reflector 4 may be cut out from a single plate body, and the casing 3 and the light guiding reflector 4 may be assembled by bending.

The bottom surface portion 3a has a rectangular shape with a long side of 10 cm and a short side of 2.5 cm, and a hole 30 for mounting the point light source 2 is provided at a line on the midpoint of each short side. The long side surface portions 3b and 3c having a height of 3 cm and the short side surface portions 3d and 3e having a height of 5 cm are vertically formed from the long side and the short side of the bottom surface portion 3a.

As shown in FIG. 3A, the light-guiding reflector 4 is provided with a central light-guiding reflection portion 4a around the optical axis of the point light source 2, and an outer light-guiding reflection portion 4b is provided around the outer circumference of the central light-guiding reflection portion 4a.

The central light guiding reflection portion 4a is formed to have a high light reflectance, and reflects the strong light radiated from the point light source 2, and the reflected light is further reflected by the inner wall surface of the casing and the light guiding reflector 4. The light reflectance of the central light guiding reflection portion 4a is appropriately set depending on the selection of the optically reflective plate material, the processing of the material (for example, the formation of the half groove, and the adjustment of the thickness), whereby the light can be effectively utilized.

An outer light guiding reflector is provided around the outer periphery of the central light guiding reflection portion 4a. 4b. The outer light guiding reflection portion 4b is provided with a hole 4c which becomes larger as the distance from the point light source is extended.

As shown in FIG. 3B, the hole 4c may be disposed in parallel with the long side and the short side of the light guiding reflector 4, and the sides parallel to the short side direction are all the same length, and only parallel to the long side direction. The sides are different, so as to form square holes 4c1~4cn whose size is adjusted. By forming such a square hole, the opening area can be increased, and the light originating from the point light source 2 can be increased. Further, the illuminance can be easily made uniform by merely making the sides parallel to the longitudinal direction different.

The light irradiation direction adjusting portions 5b and 5c have the same rectangular shape, and are attached to the upper portions of the long side surface portions 3b and 3c at a state inclined by 45 degrees on the point light source 2 side so as to be symmetrical with respect to the light of the point light source. The lengths of the long sides of the light irradiation direction adjusting portions 5b and 5c are the same as those of the long side surface portions 3b and 3c, and a gap 5a of a fixed width h is provided between the light irradiation direction adjusting portions 5b and 5c. By irradiating the light from the gap h through the light guiding reflector 4, a uniform linear light source can be obtained. In the present embodiment, the light irradiation direction adjusting portions 5b and 5c are attached at an inclination of 45 degrees. However, if the angle is made smaller, the width h of the gap 5a is made thinner, and a finer uniform linear light source can be obtained. If the angle is made larger and the width h of the gap 5a is made thicker, the amount of light can be increased. However, if the angle is too small, the angles of the connecting portions of the long side surface portions 4b, 4c and the light irradiation direction adjusting portions 5b, 5c become too sharp, and the reflected light concentrated to the connecting portion increases, and the light loss becomes Big. Moreover, if the angle is too large, the height of the linear light source device 1 itself will become too high, and the angle is desirably 45 degrees or more and 60 degrees or less.

The housing 3, the light guiding reflector 4, and the light irradiation direction adjusting portions 5b and 5c forming the linear light source device 1 are members having high reflectance, for example, having light reflectance. A material such as an ultrafine foamed light reflecting plate having a characteristic of 98%, a light transmittance of 1%, and a light absorptance of 1%. Since the ultrafinely-foamed light-reflecting material can reflect light from the point light source 2 on the inner wall surface of the casing 3 with high light reflectance, it can be utilized efficiently. Further, since the ultrafine foamed light reflecting plate is lightweight, the weight of the linear light source device 1 can be reduced. Further, it is easy to obtain from the ultrafine microfoamed light reflecting plate, and it is also possible to reduce the cost when manufacturing the linear light source device 1 from a point where the price is low.

A modification of the linear light source device according to Embodiment 1 of the present invention will be described with reference to Fig. 4. In addition, the 4A to 4F are cross-sectional views of the linear light source device of each modification corresponding to the portion of Fig. 1B.

As shown in FIG. 4A, the light irradiation direction adjusting portion 51b can also be longer than the light irradiation direction adjusting portion 51c. Further, as shown in FIG. 4B, the longer side surface portion 3c is used as the long side portion 3b, and the irradiation direction adjusting portions 52b and 52c are attached to the long side surface portion so as to be parallel to the bottom surface portion 3a. 3b, 3c. By forming the above configuration, the irradiation direction of the light can be changed from the optical axis of the point light source 2 to the other direction.

Further, as shown in Figs. 4C and 4D, the light irradiation direction adjusting portions 53b, 53c, and 53d may be attached to illuminate the light in two directions. The light irradiation direction adjusting portions 53b and 53c are attached to the respective long side surface portions 3b and 3c, and the light irradiation direction adjusting portion 53d is attached to the respective light direction adjusting portions 53b and 53c with a fixed width h and mounted in parallel.

In the above-described embodiments and modifications, a flat plate is used as the light irradiation direction adjusting portion, but a curved plate obtained by cutting a part of the cylinder may be used as shown in Fig. 4E. By using the curved plate, since there is no longer a corner, there is no longer the case where the reflected light converges toward the corner, and the amount of light irradiated from the gap 5a Increase, the illuminance will increase. Further, as shown in FIG. 4F, the point light source 2 may be attached to the long side surface portion 3b or 3c instead of the bottom surface portion 3a. When the position of the linear light source device 1 is lowered, even when it is difficult to install, the height of the linear light source device 1 can be reduced by attaching the point light source 2 to the long side surface portion.

Example 2

A linear light source device according to a second embodiment of the present invention will be described with reference to Figs. 5 and 6. 5A is a perspective view of a linear light source device according to a second embodiment of the present invention, and FIG. 5B is a plan view of a light guiding reflector used in the linear light source device according to Embodiment 2 of the present invention, and FIG. 6A is a plan view. A perspective view of a linear light source device according to a third embodiment of the present invention, and a sixth side view of a linear light source device according to a third embodiment of the present invention.

In the above-described embodiment, the shape of the long side surface portion is a flat rectangular shape. However, as shown in Fig. 5, the shape of the long side surface portion may be an arc shape in which the center of the circle is parallel to the bottom surface portion. . As shown in FIG. 5, the long side surface portions 31b and 31c are formed in an arc shape, and the bottom surface portion 31a and the light guiding reflector 41 are also formed in an arc shape, and a plurality of the linear light source devices are connected by a plurality of the linear light source devices. 1B, it is possible to obtain a circular illumination light that is not linear, but a so-called donut-shaped circular illumination light. Further, as shown in Fig. 6, the shape of the long side surface portion may be an arc shape in which the center of the circle is located on a plane parallel to the long side surface portion. The linear light source device 1C having an arc shape in which the center of the circle is located on the surface parallel to the long side surface portions 32b and 32c is connected in plurality in the longitudinal direction, whereby linear illumination light can be obtained even on the curved surface.

Example 3

Next, an optical reading apparatus according to a third embodiment of the present invention will be described with reference to Fig. 7. Further, Fig. 7A is a plan view of an optical reading apparatus according to a fourth embodiment of the present invention, and Fig. 7B is a cross-sectional view taken along line VIIB-VIIB of Fig. 7A.

The image forming apparatus 6 includes an apparatus main body and an image reading apparatus 7 mounted on the apparatus main body. The image reading device 7 can also be incorporated into the device body.

The image forming apparatus 6 includes a document glass table G on which a document can be placed, or a document is fed by an automatic document feeding device (not shown), a linear light source device 1D for reading a document, and guide shafts 61a and 61b. Guide the image sensor to the sub-scan direction; etc. For example, the original glass table G, which is a light-transmitting original table, is divided by the stay S. Furthermore, the main scanning direction is the direction of the arrow A, and the sub-scanning direction is the direction of the arrow B.

The linear light source device 1D is coupled to the endless belt 63 by a motor 62. The linear light source device 1D is normally detected by a sensor (not shown) and stands by at the home position.

The linear light source device 1D is supported by the one guide shaft 61a, and is guided to move in the sub-scanning direction B, while the other guide shaft 61b is supported only in the idling state. Therefore, the linear light source device 1D can smoothly move back and forth in the sub-scanning direction B at a uniform speed with respect to the guide shafts 61a and 61b without rubbing. Therefore, the image reading device 7 can read the original evenly without unevenness.

The operation of the image reading device will be described. There are flow reading and fixed reading in terms of the reading operation of the original. First, the flow reading will be described. The flow reading system moves the original and fixes the linear light source device 1D to read the original.

The automatic document feeding device causes the document on the document tray to be discharged to the document discharge tray through the document glass table G. At this time, the linear light source device 1D moves to the lower side of the round glass table G and stops, and the light of the LED 2 is irradiated onto the original on the original glass table G, and the original is read. The operation of reading the original is as follows. Since the original glass table G passes the original document and causes the linear light source device to read the glass table of the original document, it is a document glass table for flow reading.

Next, the fixed reading will be described. The fixed reading system fixes the original and moves the linear light source device 1D to read the original.

The user opens the original automatic feeding device at the rear to open the original glass table G. Then, the user places the original on the original glass table G, and closes the automatic document feeding device. As a result, the document is pressed against the glass table G by the automatic document feeding device. Thereafter, the linear light source device 1D irradiates the document with the light of the LED 2 while moving in the sub-scanning direction B, and reads the document. The action of reading the original is as described later. In this manner, the original glass table G mounts the original and causes the moving linear light source device 1D to read the glass table of the original, so that the original glass table for reading is fixed.

The original reading operation of the linear light source device 1D will be described. Regardless of the flow reading or the fixed reading, the original is moved relative to the image sensor to read the original, and the reading operation of the linear light source device 1D itself is the same. Therefore, the reading operation of the linear light source device 1D that is fixedly read will be described.

LED2 illuminates the original. The linear light source device 1D illuminates the respective reflected light after the respective LEDs 2 arranged in the main scanning direction A, and condenses the light into the main scanning direction A by the condensing mirror 71, and converts it into an electric signal by a CCD (not shown). .

The linear light source device 1D reads the original while reading the main scanning direction A Below the glass table G, by the guidance of the guide shafts 61a, 61b and the pulling of the belt, only a predetermined pitch is moved in the sub-scanning direction to perform reading. In this manner, the linear light source device 1D moves while reading in the main scanning direction A and reading in the sub-scanning direction B, and transmits the obtained electric signal as a video signal to the image forming device 6. Device body. Apparatus This system copies an original on a sheet based on an image signal from the image reading apparatus 7.

When the linear light source device is used in an optical reading device, since linear illumination light having uniform brightness can be obtained, relatively vivid optical reading can be performed. Further, when the linear light source device is formed by the ultrafinely-foamed light-reflecting member, the reading speed can be increased because of the light weight, and the speed of reading can be increased.

1, 1B, 1C, 1D‧‧‧ linear light source device

2‧‧‧ point light source

3‧‧‧Shell

3a, 31a, 32a‧‧‧ bottom part

3b, 3c, 31b, 31c, 32b, 32c‧‧‧ long side

3d, 3e‧‧‧ short side side

4, 41, 42‧‧‧ light guide reflector

4a‧‧‧Central light guiding reflector

4b‧‧‧Outside light guiding reflector

4c1, 4c2, 4cn‧‧‧ square holes

5, 5b, 5c, 51b, 51c, 52b, 52c, 53b, 53c, 53d, 54b, 54c‧‧‧Light irradiation direction adjustment section

6‧‧‧Image forming device

6‧‧‧Linear light source device

7‧‧‧Image reading device

22‧‧‧LED

24‧‧‧Diffusion members

24a‧‧‧Development Department

61‧‧‧Diffuse stripes

61a, 61b‧‧‧Guidance axis

62‧‧‧Motor

62‧‧‧Light source

63‧‧‧With

71‧‧‧Condenser

A‧‧‧ main scanning direction

B‧‧‧Sub Scanning Direction

D‧‧‧ original

G‧‧‧Original glass table

S‧‧‧ stay

Fig. 1A is a perspective view showing a linear light source device according to a first embodiment of the present invention, and Fig. 1B is a cross-sectional view taken along line IB-IB of Fig. 1A.

Fig. 2 is an exploded perspective view showing the linear light source device of the first embodiment of the present invention.

Fig. 3A is a plan view of a light guiding reflector used in the linear light source device according to Embodiment 1 of the present invention, and Fig. 3B is a modification of the light guiding reflector.

4A to 4F are cross-sectional views of a portion of the linear light source device of each modification corresponding to the portion of Fig. 1B.

Fig. 5A is a perspective view showing a linear light source device according to a second embodiment of the present invention, and Fig. 5B is a plan view showing a light guiding reflector used in the linear light source device according to the second embodiment of the present invention.

6A is a perspective view of a linear light source device according to Embodiment 3 of the present invention, 6B is a side view of the linear light source device of Embodiment 3 of the present invention.

Fig. 7A is a plan view of an optical reading device according to a fourth embodiment of the present invention, and Fig. 7B is a cross-sectional view taken along line VIIB-VIIB of Fig. 7A.

8A and 8B are cross-sectional views of the image reading apparatus disclosed in Patent Document 1.

Fig. 9 is a perspective view of the linear light source unit disclosed in Patent Document 2.

2‧‧‧ point light source

4‧‧‧Light guide reflector

5b, 5c‧‧‧Light illumination direction adjustment

Claims (10)

A linear light source device comprising: a point light source; the housing is configured by: a bottom surface portion having a hole for providing the point light source, and having a long side and a short side; and a long side surface portion; And a short side portion that is vertically erected from the short side of the bottom surface portion and has a predetermined length; the light guiding reflector is A supporter of the short side surface portion and the long side surface portion; wherein the light guiding reflector is formed of a plate-like body having a center centered on an optical axis of the point light source a reflection light guiding portion and an outer reflection light guiding portion provided around the central reflection light guiding portion, and a first light irradiation direction adjusting portion that is attached to the outer side surface portion from the long side surface portion And a second light irradiation direction adjusting portion that is mounted in parallel with the first light irradiation direction adjusting portion in a predetermined width. A linear light source device comprising: a point light source; the housing is configured by: a bottom surface portion having a hole for providing the point light source, and having a long side and a short side; and a long side surface portion; a portion having a predetermined length vertically erected from the long side of the bottom surface portion; and a short side portion from the short side of the bottom portion a light guide reflector that is vertically erected and has a predetermined length; the light guide reflector is supported by the short side surface portion and the long side surface portion; and the light guide reflector is formed of a plate body. The plate-like body is provided with a central reflective light guiding portion centered on the optical axis of the point light source, and an outer reflective light guiding portion provided around the central reflective light guiding portion, and is attached to each of the long side surface portions. a pair of light irradiation direction adjusting portions; the respective light irradiation direction adjusting portions are attached at an angle of 45 to 60 degrees with respect to the optical axis of the point light source so as to approach each other away from the bottom surface portion. The linear light source device according to claim 1 or 2, wherein the outer reflection light guiding portion has a plurality of rectangular holes, and the length of the side parallel to the short side of the rectangular holes is constant. A linear light source device according to claim 1 or 2, wherein the point light source is a light emitting diode or a laser diode. The linear light source device according to claim 1 or 2, wherein the casing, the light guiding reflector, and the light irradiation direction adjusting portion are formed of an ultrafine foaming light reflecting member. A linear light source device comprising: a point light source; the housing is configured by: a bottom surface portion having a hole for providing the point light source, and having a long side and a short side; and a long side surface portion; And a short side portion that is vertically erected from the short side of the bottom surface portion and has a predetermined length; the light guiding reflector is A supporter of the short side surface portion and the long side surface portion; wherein the light guiding reflector is formed of a plate-like body having a center centered on an optical axis of the point light source a reflective light guiding portion and an outer reflective light guiding portion provided around the central reflective light guiding portion, and having a light irradiation direction adjusting portion attached to one of the long side surface portions; and the light irradiation direction adjustment The parts are attached by being inclined at a predetermined angle so as to be close to each other away from the bottom surface portion, and the shape of the light irradiation direction adjusting portion is a curved plate-like body. A linear light source device comprising: a point light source; the housing is configured by: a bottom surface portion having a hole for providing the point light source, and having a long side and a short side; and a long side surface portion; And a short side portion that is vertically erected from the short side of the bottom surface portion and has a predetermined length; the light guiding reflector is Supported by the aforementioned short side side portion and the aforementioned long side side portion; characterized in that: The light-guiding reflector is formed of a plate-like body having a central reflection light guide centered on an optical axis of the point light source and an outer reflection guide disposed around the central reflection light guide portion. The light portion has a light irradiation direction adjusting portion that is attached to one of the pair of long side surface portions, and each of the light irradiation direction adjusting portions is attached at a predetermined angle so as to approach each other away from the bottom surface portion. The long side surface portion of the casing has an arc shape. A linear light source device comprising: a point light source; the housing is configured by: a bottom surface portion having a hole for providing the point light source, and having a long side and a short side; and a long side surface portion; And a short side portion that is vertically erected from the short side of the bottom surface portion and has a predetermined length; the light guiding reflector is A supporter of the short side surface portion and the long side surface portion; wherein the light guiding reflector is formed of a plate-like body having a center centered on an optical axis of the point light source a reflective light guiding portion and an outer reflective light guiding portion provided around the central reflective light guiding portion, and having a light irradiation direction adjusting portion attached to one of the long side surface portions; and the light irradiation direction adjustment Departments to keep away from the aforementioned bottom The face is attached to each other so as to be attached to a predetermined angle, and a diffusion sheet or a diffusion plate that diffuses light is attached to the opening portion of the light irradiation direction adjusting portion. A linear light source device comprising: a point light source; the housing is configured by: a bottom surface portion having a hole for providing the point light source, and having a long side and a short side; and a long side surface portion; And a short side portion that is vertically erected from the short side of the bottom surface portion and has a predetermined length; the light guiding reflector is A supporter of the short side surface portion and the long side surface portion; wherein the light guiding reflector is formed of a plate-like body having a center centered on an optical axis of the point light source a reflective light guiding portion and an outer reflective light guiding portion provided around the central reflective light guiding portion, and having a light irradiation direction adjusting portion attached to one of the long side surface portions; and the light irradiation direction adjustment The parts are attached at a predetermined angle so as to be close to each other away from the bottom surface portion, and the light irradiation direction adjusting portion is formed integrally with the casing. A linear illumination device for an optical reading device, comprising a linear light source device, a mounting table and a concentrating device, wherein the linear light source device comprises: spot light The source, the housing, and the light guiding reflector are characterized in that the housing is configured by a bottom portion having a hole for arranging the point light source and having a long side and a short side. a long side portion having a predetermined length vertically erected from the long side of the bottom portion; and a short side portion having a predetermined length vertically erected from the short side of the bottom portion The light guiding reflector is composed of the short side surface portion and the long side surface portion supported by the long side portion, and is composed of a plate body provided with a central reflection centering on the optical axis of the point light source. a light guiding portion and an outer side light guiding portion provided around the central reflecting light guiding portion, wherein the linear light source device includes a light irradiation direction adjusting portion attached to one of the long side surface portions; the light The irradiation direction adjusting portions are attached at a predetermined angle so as to approach each other as they move away from the bottom surface portion, and are provided with a reflector that is irradiated by the linear light source device and reflected by the mounting table. Converging toward the converging means.