JP2003346509A - Linear light source for image scanner and liquid crystal module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a linear light source for an image scanner and a liquid crystal module with a light guide rod which has a simple structure and shape and easy to make at low cost, which is small in volume, good in light energy efficiency, changeable in its length, high in brightness and low in cost, having multi-function of generating monochromatic lights of various wavelength and a polychromatic light. <P>SOLUTION: The linear light source comprises a light source and a light guide rod of polygonal prism, one of whose faces is a reflecting face and distributed surface emission. The face opposite to the reflecting face is made to be a convex face of emission and the other faces have reflecting layers on them. At least one of both end faces of this polygonal prism are faces of incidence of light beams from light sources placed on both ends or a light source placed on one end of the prism which has a reflecting layer on the other end. The light beams from the light sources are evenly emitted through the convex face of emission. <P>COPYRIGHT: (C)2004,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus and a linear light source used for a liquid crystal module, and more particularly to an image reading apparatus such as a scanner, a facsimile, a multifunctional peripheral office machine, and a copying machine, or a liquid crystal module. The present invention relates to a linear light source used for an image reading device and a liquid crystal module, comprising a light source device and a light guide rod.

[0002]

2. Description of the Related Art In image reading apparatuses such as a scanner, a facsimile, a multifunctional peripheral office machine, and a copying machine, it is necessary to illuminate a target using a linear light source. It is necessary to illuminate the liquid crystal background, but one type of method used for this is to use a linear light source and further combine a light guide rod that converts the linear light source into a planar light source. Thus, a backlight is provided to the liquid crystal panel.

The current technologies of the image reading device and the linear light source of the liquid crystal module include a linear light source 110 using a cold cathode tube of FIG. 1, a linear light source 120 using a light emitting diode (LED) array of FIG. A linear light source 130 in which a columnar lens is added to the LED array in FIG. 3, a linear light source 140 in which the columnar light guide rod in FIG. 4 is adopted, and a linear light source in which a case is added to the columnar light guide rod in FIGS. Light sources 150, linear light sources 160, 170 adopting light guide rods configured to intersect the columnar surface and the inclined surface of FIGS. 7, 8, 9 and 10, 11 and 12;
180 and 190.

The linear light source 110 shown in FIG.
12 and the conversion circuit 114. The light emission principle of the cold cathode tube 112 is the same as that of an ordinary fluorescent tube (hot cathode tube), except that the electrode portion has no filament structure, is simple, and the electrode is small. It has the advantage that it can be adapted to the diameter of a thin tube. However, this technique requires the conversion circuit 114 to be arranged, and therefore has a large volume, and the cold-cathode tube 112 is a columnar light-emitting device, and therefore has a low light energy utilization rate and can generate light of different wavelengths. It cannot be broken easily and has a short life.

In FIG. 2, a large number, for example, 4
Zero LEDs 124 are mounted. This technique has a low light utilization factor because the radiation solid angle of the LED 124 can be as large as half a space. The gap existing between the LEDs 124 does not match the light emission intensity, so that the uniformity of light is low, and the manufacturing cost is high because many LEDs 124 are employed.

In FIG. 3, a large number of substrates, for example, 40
LEDs 124 are attached, and the columnar lens 13
2 are installed. Compared to FIG. 2, the technology of the added cylindrical lens 132 improves the light energy utilization and the uniformity of the light, but the light energy utilization,
Uniformity was still insufficient, and there was a drawback that the production cost was increased.

See US Pat. No. 5,400,224 for the technique shown in FIG. The cross section of the light guide rod 142 may be circular, rectangular, triangular, elliptical, or irregular. After being incident, the incident light 200 propagates through the light guide rod 142 in a total reflection manner with no light transmission loss for light rays having an incident angle larger than the critical angle, and finally exits from another end and exits. An emission light 202 is formed. After the light beam reaches the surface pattern 144, a light beam having an incident angle smaller than the critical angle is refracted and emitted from the surface pattern 144, and the surface pattern 1 is emitted.
Forty-four refracted light rays 204 are formed, and at the same time, the light smooth surface corresponding to the surface pattern 144 refracts and emits light rays whose incident angle is smaller than the critical angle, thereby forming refracted light rays 206 of the light smooth surface. Since light rays are emitted from three sides, the light energy utilization rate is low. Since the light guide rod 142 has only a simple columnar surface and the surface pattern 144 has only a simple band shape, light uniformity is low.

For the technique shown in FIGS. 5 and 6, see Japanese Patent Application Laid-Open No. 8-163320. Linear light source 150
Is composed of the light guide rod 152, the light source device 300, and the case 158, and the cross section of the light guide rod 152 having a columnar surface is a pentagon formed by cutting off one corner of a rectangle,
Alternatively, it is a polygon formed by cutting two corners or more corners of a rectangle, and a plane formed after cutting one corner is the emission surface 154, and the light guide rod 1
A reflection layer 156 is applied to the side surfaces other than the both side surfaces adjacent to the emission surface 154 of the light source 52 (see FIG. 6), and a thin air layer is formed on at least one surface other than the emission surface 154 and the end surface where the light source device 300 is installed. A case 158 is provided separately. This technique requires the installation of a case 158, which increases volume and manufacturing costs. The cross section of the light guide rod 152 is a polygon formed by cutting some corners from a rectangle, and it is easy to generate a light beam whose incident angle is smaller than the critical angle.
For the light rays refracted and emitted from the surface of the light guide rod 1, only a part is reflected by the inner wall of the case 158 and then newly refracted.
52, the light energy utilization rate is not sufficiently high, and the output light distribution is adjusted only by the reflective layer 158, so that the light uniformity is not sufficiently good.

The technology shown in FIGS. 7 and 8 is described in Taiwan Patent Publication No. 326,931. 6, the linear light source 16 is shown.
0 is composed of the light guide bar 162 and the light source device 300.
Light guide rod 162 configured so that the column surface and the slope intersect each other
The cross section of each of the pillars is rectangular, the slope is a slope 164, the emission face 168 corresponds to the slope 164, and a surface pattern 165 and a reflection layer 166 are provided on the slope 164. The linear light source 170 shown in FIG. 8 is composed of a light guide bar 172 and a light source device 300 at two ends. In FIG.
Light guide bar 172 configured so that the pillar surface and the inclined surface cross each other
Has a rectangular cross section with two pillars, and a slope 17 having two slopes.
4. The emission surface 178 corresponds to the inclined plane 174,
Others are installed similarly to FIG. In the above-described technique, the light guide rods 162 and 172 have rectangular cross sections, easily generate a light beam having an incident angle smaller than the critical angle, and form a loss of light transmission. Therefore, the light energy utilization rate is not high. Since the output light distribution is adjusted by the slightly inclined slopes 164 and 174 and the reflective layer 166, the light uniformity is poor.

The linear light source 180 shown in FIG. 9 and FIG.
Is composed of a light guide rod 182 and a light source device 300 located at two ends. The light guide rod 182 configured such that the pillar surface and the slope intersect each other has both pillar cross sections in an irregular shape (see FIG. 10), and the slope has two pairs of inclination directions located on two sides of the light guide rod 182. The emission surface 186 is formed of another non-cylindrical column surface, and the emission surface 186 corresponds to a surface pattern 188 coated with a reflective layer. Because of this irregular cross-sectional shape of the light guide rod 182, this technique tends to generate light rays whose incident angle is smaller than the critical angle, which results in a loss of light transmission, and thus the light energy utilization is not very high. Further, since the reflection layer has a simple band shape and the light transmission distribution is adjusted by the inclined plane 184 exhibiting a slight linear change, the light uniformity is not so good.

A linear light source 190 shown in FIGS. 11 and 12 is composed of a light guide rod 192 and a light source device 300. Light guide bar 192 configured so that the pillar surface and the slope surface intersect each other
The cross section of the column has an irregular shape, the slope is a curved surface 194, the exit surface 196 is an irregular column surface, and the output surface 196 corresponds to a surface pattern 198 coated with a reflective layer. In addition, a groove 199 composed of two more slopes
There is. Because of this irregular cross-sectional shape of the light guide rod 192, this technique is prone to generate light rays having an incident angle smaller than the critical angle, resulting in a loss of light throughput, and therefore less than ideal light energy utilization. In addition, since the reflection layer has a simple band shape and the distribution of output light is adjusted slightly by the inclined surface 194 and the groove 199, the light uniformity is not ideal.

The technique shown in FIG. 13 is disclosed in Taiwan Patent Publication No. 420306, in which the surface pattern of the reflecting surface of the light guide bar is perpendicular to the optical axis of the transmission surface, which is formed as an unequal distance bevel. The reflective layer has an irregular shape. The bevel is inclined in a direction opposite to the light source device, and reflected light is propagated in a direction opposite to the light source device. This has the advantages of achieving excellent light uniformity, small volume, high light energy utilization, and being able to cut or extend short. However, it is necessary to make the surface pattern into an unequal-diagonal beveled shape by making the standard requirements for the accuracy of the light guide rod mold stricter considerably, and it is necessary to apply and form an irregular reflection layer. The mold manufacturing cost is high, it is difficult to increase the yield, and the production cost cannot be reduced, which is not ideal.

[0013]

SUMMARY OF THE INVENTION The main object of the present invention is to provide a kind of image reading apparatus and a linear light source used for a liquid crystal module, and the structure and shape of the light guide bar are simple. Therefore, the accuracy requirement of the mold is reasonable and not strict, the mold manufacturing cost can be reduced, and the surface pattern of the reflective layer having the surface pattern and the reflective function can be treated with the surface roughness. Therefore, the application of the reflective varnish or the plating level is simple, and the application under the reflective varnish is extremely poor and the plating is not performed. Therefore, the production yield of the light guide bar can be easily achieved.

A further object of the present invention is to provide a kind of image reading apparatus and a linear light source used for a liquid crystal module. Can do so.

Another object of the present invention is to provide a kind of image reading device and a linear light source used for a liquid crystal module, and this linear light source emits a point light source or a point light source after conversion. It is assumed that linear emitted light can be obtained by transmitting the light through the light guide rod of the present invention.

Still another object of the present invention is to provide a kind of image reading device and a linear light source used for a liquid crystal module, and this linear light source can generate monochromatic light of different wavelengths, respectively. In addition, a longer linear light source can be obtained by merging and extending.

Another object of the present invention is to provide a kind of image reading apparatus and a linear light source used for a liquid crystal module. The present invention is particularly applied to a scanner, a facsimile, a multifunctional peripheral office machine and a copying machine. It is applied to a linear light source for target illumination required for an image reading device such as a printer and background illumination required for a liquid crystal module.

[0018]

According to a first aspect of the present invention, in a linear light source, at least a light source device, one non-closed convex positioning surface, at least one reflection surface and at least one mounting surface are provided. Surface, and at least one light-emitting diode attached to the mounting surface, the light source device, and a light guide rod, one convex polygonal column,
At least one exit surface, a reflection surface, and a plurality of reflection layers, at least one caudal end of the main body is an entrance surface through which light rays enter, and two corresponding surfaces in the main body have a surface pattern. A reflection surface having a reflection surface and an emission surface corresponding to the reflection surface are provided, and the other surface is composed of a reflection layer surface having a reflection effect, and light rays entering from the incidence surface perform transmission of the polygon body and multi-order reflection of the reflection surface. The light guide rod, which is uniformly emitted from the emission surface after passing through, is provided as a linear light source. The invention of claim 2 is based on claim I
Wherein the convex polygonal column of the light guide bar is a convex octagonal column. According to a third aspect of the present invention, in the linear light source according to the first aspect, the center line of the non-closed convex polygonal body of the light source device is perpendicular to the mounting surface, and the center line is the optical axis of the light source device. And a linear light source.
According to a fourth aspect of the present invention, in the linear light source according to the first aspect, the non-closed convex polygonal main body constituting the convex positioning surface of the light source device is mutually intersected with another plane constituting the positioning surface. The light source is a linear light source.
According to a fifth aspect of the present invention, in the linear light source according to the first aspect, one plane constituting the positioning surface of the convex polygonal body of the light source device is parallel to the mounting surface. Light source. The invention of claim 6 is the invention of claim 1
A linear light source characterized in that a non-closed convex polygonal main body constituting a positioning surface of the light source device and a CIS light guide rod incident side end are tightly combined. . According to a seventh aspect of the present invention, in the linear light source according to the first aspect, the center line of the convex polygonal body constituting the reflection surface of the light source device overlaps with the optical axis of the light source device. Light source. According to an eighth aspect of the present invention, in the linear light source according to the first aspect, an upper portion of the reflection surface of the light source device and a plane of the positioning surface are cut to form at least one circular matched light beam emission port. , And a linear light source. According to a ninth aspect of the present invention, in the linear light source according to the first aspect, the mounting surface and a bottom portion forming a parabolic reflective surface intersect to form one rectangular notch, and the light emitting diode is formed in the rectangular notch. A linear light source characterized by being attached. According to a tenth aspect of the present invention, in the linear light source according to the first aspect, one or more light emitting diodes are mounted on the mounting surface in such a manner that a distance from the optical axis is latest and uniformly distributed. To be a linear light source. According to an eleventh aspect of the present invention, in the linear light source according to the first aspect, a substantially convex body is formed on an emission surface of the main body of the light guide rod. According to a twelfth aspect of the present invention, in the linear light source according to the thirteenth aspect, the emission surface of the convex body of the light guide rod is formed in an elongated shape, and the width of the elongated shape is adjusted depending on an application, so that ideal light is obtained. A linear light source characterized by achieving intensity. According to a thirteenth aspect of the present invention, in the linear light source according to the fourteenth aspect, a surface pattern is provided on a reflection surface of the light guide bar, and the surface pattern is subjected to a stepwise process, and the degree of roughness of the surface at each section is different. The linear light source is characterized in that it is a linear light source. According to a fourteenth aspect of the present invention, in the linear light source according to the first aspect, a surface pattern is provided on a surface of the polygonal main body reflecting surface of the light guide rod, and the surface pattern is subjected to a stepwise processing, and a portion close to the light source is provided. Is relatively smooth and slightly rough, and the degree of roughness at the part distant from the light source gradually increases. The feature is a linear light source. According to a fifteenth aspect of the present invention, in the linear light source of the thirteenth aspect, the surface pattern is a groove pattern, and a region forming the groove pattern is divided into two or more regions. The linear light source is characterized in that the roughness of the pattern is uniform in the area, and the pattern varies between the areas at different depths and widths. According to a sixteenth aspect of the present invention, in the linear light source according to the first aspect, the surface of the reflection surface having the surface pattern of the polygonal main body of the light guide rod is formed of a silver-white reflection varnish. , And a linear light source. According to a seventeenth aspect of the present invention, in the linear light source according to the first aspect, another end of the polygonal main body of the light guide rod is a tail end surface, and the tail end surface transmits the light reaching the surface in the polygonal main body. The linear light source is characterized by being reflected back to the light source. According to an eighteenth aspect of the present invention, there is provided the linear light source according to the eighteenth aspect, wherein a film is formed on a surface of a tail end surface of the light guide rod with a silver-white reflective varnish. According to a nineteenth aspect of the present invention, in the linear light source of the first aspect, the outer surface of the polygonal column is covered with a polygonal reflective cover, and the reflective cover covers the outer surface of the polygonal column, and the area covered by the polygonal column. And a reflecting surface having a surface pattern.

[0019]

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a kind of linear light source, which comprises a light guide rod and a light source device.

The light guide bar has a polygonal body, at least one tail end of which is an entrance surface for entering a light beam, and has a corresponding surface pattern on two corresponding surfaces in the body. A reflection surface having the same and an emission surface corresponding to the reflection surface are provided, and the other surface is composed of a reflection layer having a reflection action, whereby light rays entering from the entrance surface can transmit the polygon body and multi-order reflection of the reflection surface. After passing through, the light beam is uniformly emitted from the emission surface.

The polygonal body has a convex surface on one surface to serve as a light emitting surface, is not coated with a film by a white reflective varnish, and has a reflective surface having a surface pattern corresponding thereto. A plating film is formed with a white reflection varnish, the surface pattern of the nuclear reflection surface is subjected to a stepwise treatment, and a portion near the light source is relatively smooth and slightly rough, and a portion far from the light source gradually increases in roughness. By adjusting the steps, the light beams on the exit surface are uniformly distributed, and the light beam uniformity is improved. The surface of the other polygonal body is a reflective layer having a reflective action, a white reflective varnish film is formed, both tail end faces of the polygonal body are light incident surfaces, and the light flux is transmitted from the light sources at both ends. Each is incident on the main body, that is, no white reflective varnish is added to both end faces, or one tail end is used as an incident surface for entering a light beam and the other tail end is used as a reflection end surface. The end face reflects the light beam that has reached this face and reaches the inside of the polygonal body, and a film made of a white reflecting varnish is formed on the reflecting end face.

The light source device is connected to the light guide rod incident end of the contact type image sensor (CIS) to form a CIS light guide rod incident light source, which is a convex polygonal seat type positioning surface, a reflecting surface and a flat mounting surface. , And at least one light emitting diode (LED) mounted on the mounting surface, the convex polygonal seating positioning surface being connected to the light guide rod entrance tail end of the CIS and tightly assembled and assembled. The mounting surface of the light rod and the light source device are orthogonal.

The center line of the unsealed polygonal light guide rod main body is perpendicular to the mounting surface of the light source device, which is the optical axis of the light source device. One non-closed convex polygonal main body constituting the positioning surface and the incident end of the convex columnar light guide rod of the CIS are tightly combined, and the other seating plane constituting the positioning surface is a CIS conductor. It comes into contact with the tail end face of the light rod incident end.

The positioning surface is a plane which intersects with the non-closed convex polygonal main body, and the one non-closed convex polygonal main body constituting the positioning surface is connected to the CIS light guide rod incident end. Tightly combined, another plane constituting the positioning surface is in contact with the end face of the CIS light guide rod incident end, and therefore has a characteristic of high accuracy of joint positioning with the CIS light guide rod incident end, and The degree of leakage light of the incident light source of the CIS light guide rod is reduced to a minimum, so that the emission intensity distribution coincidence is excellent, and at least one of the light emitting diodes has the latest distance from the optical axis and the mounting surface in a uniform distribution manner. , So that the luminous intensity distribution is concentrated on the optical axis, thereby increasing the light energy utilization and light uniformity of the CIS light guide rod connected thereto.

By simply inserting the CIS light guide rod incident end directly, one unsealed polygonal body forming the positioning surface and the CIS light guide rod incident end are tightly combined to realize connection, and a normal hot No melt riveting process required
Therefore, it has the characteristic that the process is simple, and the production cost can be reduced.

[0026]

FIG. 14 is a three-dimensional display diagram of a preferred embodiment of the present invention. As shown, the linear light source 10 of the present invention is composed of a light guide rod 20 and a light source device 30. The structure of the light guide bar 20 has a main body having an essentially octagonal shape, and a symmetrical octagonal prism is the most preferred embodiment in the present invention. The symmetrical octagonal prism 210 has at least one entrance surface 220 provided for light ray entry, one reflecting surface 230,
It comprises one exit surface 240 and a reflective layer 250, the other end of the symmetric octagonal prism 210 being a tail end surface 260, of which the entrance surface 220 is located at one end of the nuclear symmetric octagonal prism 210, which is , The nuclear symmetric octagonal prism 2
10 is provided with a long convex body 270 on one side. The upper end of the elongated convex body 270 is an emission surface 240, and the nuclear reflection surface 23
0 and the exit surface 240 are respectively symmetrical octagonal prisms 210
Are provided on the corresponding two side surfaces, and the other is a reflection layer 250. The reflection layer 250 has a reflection surface 230 and an emission surface 2 respectively.
The other end is a tail end surface 260. Separately, the material of the symmetrical octagonal column 210 is made of an optical material having high transmission and low absorption, for example, acrylic. The smaller the degree of roughness of the surface of the light guide rod structure is, the better the refractive index of the medium is. The angle of incidence of the incident light is more likely to be greater than the critical angle, achieving total internal reflection and reducing loss of light throughput.

The inner surface of the nuclear reflection surface 230 is separately subjected to a surface treatment, and the surface pattern treatment method is divided into two types.
Please refer to FIG. 15 and FIG. These are sectional views of the light guide bar structure of the present invention. One of the surface pattern processing methods is a method in which the roughness of the surface remote from the light source is increased, and the surface roughness of a portion close to the light source is reduced. Another method is a severing process, where each step has a different degree of surface roughness, increasing or decreasing its reflection, refraction and absorption coefficients,
A surface having a high surface roughness has a large light diffusing ability and a large reflection angle.On the other hand, a surface having a low surface roughness has a small light diffusing ability and a small reflection angle, and at the same time, has a small reflection angle. The amount of light source can be modified. That is, a region for forming a pattern is divided into a plurality of regions, and a groove-shaped pattern having a different depth and width is formed for each region. Similarly, this symmetric octagonal prism 2
By changing the length of the surface 10, the area of the surface pattern can be reduced or increased, whereby the amount of light transmission can be adjusted, and thereby the light uniformity can be increased. The light exit surface 240 is provided so as to correspond to the reflection surface 230, and the reflection surface 250 is composed of a plurality of rectangular planes, is connected to the reflection surface 230 and the light exit surface 240, respectively, and has an optical axis of the transmission surface, that is, x. Each section of the axis is composed of the reflection surface 230 and the exit surface 2.
Perpendicular to 40. FIG. 17 and FIG. 18 are ray path diagrams, in which light rays entering from the entrance surface 220 pass through multiple reflections of the plurality of reflective layers 250, thereby increasing the light uniformity, thereby increasing the light rays. Are concentrated on the reflection surface 230, and further, through the reflection of the reflection surface 230,
0, and the reflection layer 250 of the reflection surface 230
Is surface-treated, so that the light uniformity is greatly increased. The other end of the symmetrical octagonal column 210 is a tail end surface 260
It is a white or silver reflective varnish formed by a film plating method, and further reflects light rays into the symmetrical octagonal column 210, thereby further increasing the light energy utilization rate, and Since the entrance surface 220, the reflection surface 230, the plurality of transmission surfaces 240, and the tail end surface 260 of the symmetrical octagonal prism 210 are all formed of white or silver varnish, the utilization and reflectance of light rays are increased. , Reducing the likelihood of light being absorbed by the material and reducing its absorption.

FIG. 19 is a perspective view of another experimental example of the present invention. As shown, another end of the target octagonal prism 210 is an entrance surface 280 that is subjected to light ray penetration,
The target octagonal column 210 can be entered from two ends.

FIG. 20 is a perspective view of a light source device according to another embodiment of the present invention.
20 and a reflecting surface 330, and the appearance of the mounting surface 310 is an octagonal prism body equivalent to a light guide rod, of which LED is
Is at least one attachment position.

FIG. 21 is a light-emitting diode mounting diagram according to one embodiment of the present invention. As shown, a light-emitting diode (LED) 40 is mounted at the center of a circular mounting surface 350. FIG. 22 is a schematic view showing a light emitting diode mounting according to another embodiment of the present invention. As shown, the center of two light emitting diodes (LEDs) 40 and the extending portion of the circular mounting surface 350 are on one straight line. In addition, the center distance between the two light emitting diodes 40 is made as small as possible. FIG. 23 is a view showing the mounting of light emitting diodes according to still another embodiment of the present invention, in which the centers of three light emitting diodes 40 are provided in a single circle having a diameter as small as possible. Circular mounting surface 3
50, and the three connecting lines between the center of the circular mounting surface 350 and the center of the three light emitting diodes 40 are 1
Adjacent at 20 °. FIG. 24 is a schematic view showing a light emitting diode mounting according to still another embodiment of the present invention, in which the centers of four light emitting diodes 40 are provided on one circle having the smallest possible diameter, and the center of the circle And the center of the circular mounting surface 350 overlap, and the connecting line at the center of the four light emitting diodes forms one square. 21 to 24, the light emitting diode is mounted on the circular mounting surface in such a manner that the distance from the optical axis is recent and evenly distributed, so that the light emission intensity distribution of the light source device is further concentrated on the optical axis. .

As disclosed in FIG. The symmetrical octagonal column (210) of the light guide rod 20 is a multi-sided reflective cover 29.
Cover the outer surface with 0. The coverage of the reflective cover 290 includes the reflective surface 230, the main effect of which is to achieve a focusing effect, so that the energy of the incident light 200 is fully utilized in the light guide rod 20 and emitted from the other end. It is to make. The above is only a description of preferred embodiments of the present invention, and does not limit the scope of the present invention, and any modification or alteration of details that can be made based on the present invention shall fall within the scope of the present invention. I do.

[0032]

The linear light source used in the image reading apparatus and the liquid crystal module of the present invention has a simple structure and shape of the light guide rod, is simple to manufacture, has low manufacturing cost, is small, and has a low light energy utilization rate. It is a linear light source used in image readers and liquid crystal modules, which has high functions, can shorten and extend the length, has multiple functions of generating monochromatic light or color light of different wavelengths, has high brightness and low manufacturing cost. is there.

[Brief description of the drawings]

FIG. 1 is a plan view showing a known linear light source employing a cold cathode tube.

FIG. 2 is a plan view of a known linear light source employing an LED array.

FIG. 3 is a cross-sectional display diagram of a known linear light source in which a columnar lens is added to an LED array.

FIG. 4 is a perspective view of a known linear light source employing a light guide bar.

FIG. 5 is a perspective view of a known linear light source in which a case is added to a light guide bar.

FIG. 6 is a sectional view of FIG. 5;

FIG. 7 is a perspective view of a known linear light source employing a light guide bar formed so that a pillar surface and an inclined surface intersect.

FIG. 8 is a plan view of another known linear light source employing a light guide bar formed so that a pillar surface and an inclined surface intersect.

FIG. 9 is a plan view of a kind of a known linear light source employing a light guide bar formed so that a pillar surface and an inclined surface intersect.

FIG. 10 is a sectional view of FIG. 9;

FIG. 11 is a plan view of another well-known linear light source of a light guide formed so that a pillar surface and an inclined surface intersect.

FIG. 12 is a sectional view of FIG. 11;

FIG. 13 is a perspective view of a known linear light source.

FIG. 14 is a perspective view of a light guide rod structure according to one embodiment of the present invention.

FIG. 15 is a cross-sectional view of the light guide rod structure of the present invention.

FIG. 16 is a cross-sectional view of the light guide rod structure of the present invention.

FIG. 17 is a view showing a path of a light beam according to the present invention.

FIG. 18 is a diagram showing a path of a light beam according to the present invention.

FIG. 19 is a perspective view of another embodiment of the present invention.

FIG. 20 is a perspective view of a light source device according to an embodiment of the present invention.

FIG. 21 is a schematic diagram showing a light emitting diode mounted according to an embodiment of the present invention.

FIG. 22 is a schematic view showing a light emitting diode according to another embodiment of the present invention.

FIG. 23 is a schematic diagram showing a light emitting diode mounted according to still another embodiment of the present invention.

FIG. 24 is a schematic view showing a light emitting diode mounted in still another embodiment of the present invention.

FIG. 25 is a cross-sectional view illustrating a light guide bar according to the present invention in which a reflection cover is provided.

[Explanation of symbols]

110 Linear light source employing a cold cathode tube 112 Cold cathode tube 114 Conversion circuit 120 Linear light source employing an LED array 122 Substrate 124 LED 130 Linear light source obtained by adding a columnar lens to an LED array 132 Columnar lens 140 Columnar light guide Adopted linear light source 142 Light guide rod 144 Surface pattern 150 Linear light source 152 with case added to columnar light guide rod Light guide rod 154 Outgoing surface 156 Reflective layer 158 Case 160 The column surface and the inclined surface intersect. Light guide rod linear light source 162 Light guide rod 164 Beveled surface 165 Surface pattern 166 Reflecting surface 168 Outgoing surface 170 Light guide rod linear light source 172 configured so that a column surface and a slant surface intersect Light guide rod 174 Beveled surface 178 Emission surface 180 Linear light source 182 of a light guide bar configured so that a column surface and a slope intersect Light guide bar 184 Slanted plane 186 Emission surface 188 Surface pattern coated with reflective layer 190 Linear light source 192 of light guide rod configured so that pillar surface and slope cross each other 192 Light guide rod 194 Inclined surface 196 Outgoing surface 198 Surface pattern 199 coated with reflective layer Groove 200 Incident light 202 Outgoing light 204 Surface pattern is refracted The emitted light beam 206 The light beam 300 whose surface pattern is refracted and emitted 300 Light source device 10 Linear light source 20 Light guide rod 210 Symmetrical octagonal prism 220 Incident surface 230 Reflective surface 240 Exit surface 250 Multiple transmission surfaces 260 Tail end surface 270 Reflective layer 290 Reflective cover 30 Light source device 310 Mounting surface 320 Positioning surface 330 Reflective surface

Continuation of front page    F-term (reference) 2H038 AA54 BA42                 2H109 AA02 AA15 AA26 AA67                 5C072 AA01 BA02 CA05 CA09 DA04                       DA16 DA25 DA30 EA07 XA01

Claims (19)

[Claims] In a linear light source, at least a light source device, at least one non-closed convex positioning surface, at least one reflection surface, at least one attachment surface, and at least one attached to the attachment surface The light source device comprising one light-emitting diode; and a light guide rod, comprising one convex polygonal column, at least one exit surface, a reflection surface, and a plurality of reflection layers, and at least one of its main body. One of the two tail-side ends is a light incident surface, and two corresponding surfaces in the main body are provided with a reflection surface having a surface pattern and a corresponding outgoing surface, and the other surface is reflected. The light guide rod, wherein the light guide rod is composed of a reflective layer surface having an effect, and is uniformly emitted from the exit surface after light rays entering from the entrance surface pass through the polygon body and multi-reflection of the reflection surface. Characterized by , Linear light source. 2. The linear light source according to claim 1, wherein the convex polygonal column of the light guide bar is a convex octagonal column. 3. The linear light source according to claim 1, wherein the center line of the non-closed convex polygonal body of the light source device is perpendicular to the mounting surface, and the center line is the optical axis of the light source device. A linear light source. 4. The linear light source according to claim 1, wherein an unsealed convex polygonal main body forming a convex positioning surface of the light source device intersects another plane configuring the positioning surface. A linear light source. 5. The linear light source according to claim 1, wherein one plane constituting the positioning surface of the convex polygonal body of the light source device is parallel to the mounting surface. 6. The linear light source according to claim 1, wherein an unsealed convex polygonal main body forming a positioning surface of the light source device and a CIS light guide rod incident side end are tightly combined. A linear light source. 7. The linear light source according to claim 1, wherein the center line of the convex polygonal body forming the reflecting surface of the light source device overlaps with the optical axis of the light source device. 8. The linear light source according to claim 1, wherein an upper portion of a reflection surface of the light source device and a plane of the positioning surface are cut to form at least one circular matched light beam emission port. Light source. 9. The linear light source according to claim 1, wherein the mounting surface intersects with the bottom part constituting the parabolic reflective surface to form one rectangular notch, and the light emitting diode is mounted in the rectangular notch. A linear light source. 10. The linear light source according to claim 1,
A linear light source, wherein one or more light emitting diodes are mounted on a mounting surface in such a manner that a distance from an optical axis is recent and uniform. 11. The linear light source according to claim I,
A linear light source, wherein a substantially convex body is formed on an emission surface of a main body of the light guide rod. 12. The linear light source according to claim 11, wherein the light-irradiating surface of the convex body of the light guide bar is formed in a long strip shape, and the width of the long strip shape is adjusted depending on an application to obtain an ideal light intensity. A linear light source, characterized in that it is achieved. 13. The linear light source according to claim 1, wherein
A linear light source, characterized in that a surface pattern is provided on a reflection surface of a light guide rod, the surface pattern is subjected to a stepwise processing, and the degree of surface roughness of each step is different. 14. The linear light source according to claim 1,
A surface pattern is provided on the surface of the polygonal main body reflecting surface of the light guide rod, and this surface pattern is subjected to a stepwise processing, and a portion close to the light source is relatively smooth and slightly rough, and the roughness of a portion far from the light source is rough. A linear light source, wherein the linear light source is gradually increased, and the uniformity of the light beam is increased by uniformly adjusting the degree of roughness so that the light beam on the emission surface is uniformly distributed. 15. The linear light source according to claim 13, wherein the surface pattern is a groove pattern, and a region forming the groove pattern is divided into two or more regions. A linear light source characterized in that the roughness of a pattern is uniform in an area, and the pattern varies between areas in different depths and widths. 16. The linear light source according to claim 1, wherein
A linear light source, characterized in that the surface of the reflection surface having the surface pattern of the polygonal main body of the light guide rod is formed of a film of silver-white reflection varnish. 17. The linear light source according to claim 1, wherein
A linear light source, characterized in that the other end of the polygonal body of the light guide rod is a tail end face, which reflects light rays reaching this surface back into the polygon body. 18. The linear light source according to claim 17, wherein a film is formed on the surface of the tail end surface of the light guide rod with a silver-white reflective varnish. 19. The linear light source according to claim 1, wherein
A line, wherein the outer surface of the polygonal column is covered with a polygonal reflective cover, the reflective cover covers the outer surface of the polygonal column, and includes a reflective surface having a surface pattern in an area to be covered; Light source.