CN203940291U - Linear light source device - Google Patents

Abstract

The utility model provides a linear light source device, which can suppress individual differences in the specularity of the reflective surface of the reflective member and can suppress the deformation of the reflective member and the accompanying dislocation, thereby suppressing the illuminance between the linear light source devices discrete. The linear light source device includes: a rod-shaped light guide, a light-emitting element, and a reflective member, wherein the reflective member has a tapered reflective surface, and the reflective surface moves from the base end near the light-emitting element toward the The front end of the body is enlarged in diameter, and the reflective member is formed by drawing a metal plate, and consists of a reflective surface forming part whose inner surface is the reflective surface, and a plate-shaped plate extending continuously from the front end of the reflective surface forming part. The reflective member is disposed on the substrate in a state in which the reflective member is sandwiched between a holding member disposed on the base end side of the reflective member and a pressing member disposed on the distal end side of the reflective member. of the flange.

Description

Linear light source device

technical field

The utility model relates to a linear light source device for reading originals used in fax machines, duplicators, scanners and other equipment.

Background technique

Image reading devices such as facsimile machines, copiers, and scanners have a document reading device that reads text and image information on the document surface using reflected light from the document surface. A linear light source device that emits linear light extending in the main scanning direction.

FIG. 11 is an explanatory sectional view showing the structure of an example of a conventional document reading device. This document reading device includes a linear light source device 70 extending in the main scanning direction (direction perpendicular to the paper surface in FIG. The mirror 73 has a reflection surface 72 that reflects light emitted from the linear light source device 70 and extends in the main scanning direction.

As shown in FIG. 12 , the linear light source device 70 has a rod-shaped light guide body 80 formed of, for example, a translucent resin such as acrylic resin, and an LED light source is disposed so as to face one end surface 80A of the light guide body 80 . and so on to form the light-emitting element 87. Specifically, a substrate 86 on which wiring (not shown) is formed is arranged to face one end surface 80A of the light guide 80 , and a light emitting element 87 is arranged on the surface of the substrate 86 .

Furthermore, on the surface of the substrate 86, a cylindrical reflective member 90 having a tapered reflective surface 92 whose diameter increases from the substrate 86 to the light guide 80 is provided on the inner peripheral surface, and the light-emitting element 87 is surrounded by the reflective surface 92. and the optical path between the light guide body 80 are configured.

Along the length direction of the light guide body 80 , a light exit surface 81 is formed along the length direction of the light guide body 80 . In addition, two minute prism groups 84a, 84b that reflect light in directions different from each other are formed on the peripheral surface facing the light exit surface 81 .

In such a linear light source device 70 , the light emitted from the light emitting element 87 passes through the optical path between the light emitting element 87 and the light guide body 80 directly or is reflected by the reflective surface 92 of the reflection member 90 to be reflected from one end surface of the light guide body 80 . 80A is incident on the light guide body 80 . The light incident in the light guide body 80 passes through the light guide body 80 and is reflected by its peripheral surface and guided along the length direction of the light guide body 80, and then reflected toward the light exit surface 81 by the micro prism groups 84a, 84b, The reflected light is emitted from the light emitting surface 81 of the light guide body 80 , and is irradiated onto the document surface 71 directly or via the reflecting surface 72 of the reflecting mirror 73 .

In the reflecting member 90 of such a linear light source device 70, in order to efficiently dissipate the heat generated by the light emitting element 87, a member is used in which a metal block made of, for example, aluminum with high thermal conductivity is used as a base material and cut Such machining is performed to form the reflective surface 92 on the inner surface (refer to Patent Document 1).

Therefore, the surface roughness of the reflective surface 92 of the reflective member 90 depends on the processing accuracy of the cutting process. However, when cutting is used, large individual differences occur in the surface roughness of the reflective member 90 , and as a result, individual differences occur in the specularity of the reflective surface 92 of the reflective member 90 . Finally, there is a problem that the light finally emitted through the light guide body 80 is discrete for each linear light source device 70 . Furthermore, in the case of a linear light source device having a structure in which the reflective member 90 and the light-emitting element 87 are disposed on both end surfaces of one light guide 80, if the reflective surfaces 92, 92 between the two reflective members 90, 90 If there is a difference in specular properties, there is also a problem that the alignment of light in the longitudinal direction will not become the desired alignment.

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2011-253699

Utility model content

The present invention was completed based on the above circumstances, and the object is to provide a linear light source device capable of suppressing individual differences in the specularity of the reflective surface of the reflective member, and capable of deforming the reflective member and accompanying it. Misalignment is suppressed, and variation in illuminance between linear light source devices can be suppressed.

The linear light source device of the present utility model comprises: a rod-shaped light guide body; a light-emitting element arranged on a substrate and arranged opposite to the end surface in the length direction of the light guide body; and a reflection member for emitting light from the The light emitted by the element is concentrated on the end surface of the light guide body. The linear light source device is characterized in that the reflective member has a tapered reflective surface, and the reflective surface is located close to the light emitting element. The diameter of the proximal end of the position is enlarged toward the front end located close to the light guide body, the reflective member is formed by drawing a metal plate, and the reflective surface forming part whose inner surface is the reflective surface and A plate-shaped flange portion extending continuously from the front end of the reflective surface forming portion is configured. The reflective member is disposed on the substrate in a state where the holding member disposed on the base end side of the reflective member and the The flange portion of the reflection member is sandwiched between the pressing members on the front end side of the reflection member.

In the linear light source device of the present invention, it is preferable that an engaging portion that prevents displacement of the reflection member relative to the holding member is formed on the holding member.

In the linear light source device according to the present invention, it is preferable that an engaging portion that prevents displacement of the pressing member relative to the holding member is formed on the holding member.

In the linear light source device of the present invention, it is preferable that a light shielding portion for preventing leakage of stray light is formed on at least one of the holding member and the pressing member.

In the linear light source device of the present invention, preferably, the holding member, the reflecting member, and the pressing member are fixed by passing through each of common screws.

In the linear light source device of the present invention, preferably, the holding member and the pressing member are each formed of a black resin material.

According to the linear light source device of the present invention, since the reflection member is formed by deep drawing, it is possible to suppress individual differences in the specularity of the reflection surface of the reflection member. Furthermore, since the reflective member is fixed in a state where the flange portion of the reflective member is sandwiched between the holding member and the pressing member, the reflective member can be pressed with a large contact area, and a large contact area can be obtained. frictional resistance. Therefore, it is possible to suppress the deformation of the reflection member and the dislocation associated therewith, and prevent damage to expected optical performance such as the mirror state of the reflection member. As a result, it is possible to suppress variation in illuminance among linear light source devices.

In addition, since the reflective member formed by deep drawing becomes thin, deformation due to screw fastening and accompanying displacement easily occur. Specifically, if the reflective member formed by deep drawing is screwed, the contact area between the screw and the reflective member becomes only the seat surface of the head of the screw. Excessive stress is generated in the member, causing it to bend and produce plastic deformation. Furthermore, depending on stress changes and conditions such as temperature changes and external vibrations, the plastic deformation of the reflection member may further develop, thereby impairing the fastening force of the screws and causing the screws to fall off. Occurrence of such deformation and misalignment adversely affects the mirror surface state of the reflection member, and individual differences in mirror surface properties of the reflection member become large.

According to the linear light source device of the present invention, furthermore, the holding member is formed with an engaging portion that prevents the displacement of the reflection member relative to the holding member, and an engaging portion that prevents the displacement of the pressing member relative to the holding member, so that Misalignment of the reflective member and the pressing member is further suppressed. Therefore, the reflective member can be arranged with higher positional accuracy. In particular, when the pressing member is screwed to the holding member, since the reflection member held therebetween can be prevented from rotating, it is possible to prevent damage to expected optical performance such as the mirror surface state of the reflection member. As a result, variation in illuminance among linear light source devices can be further suppressed.

According to the linear light source device of the present invention, furthermore, the holding member, the reflecting member, and the pressing member are fixed while being penetrated by common screws, so that misalignment of the reflecting member and the pressing member can be further suppressed. Therefore, the reflective member can be arranged with higher positional accuracy. As a result, variation in illuminance among linear light source devices can be further suppressed.

According to the linear light source device of the present invention, furthermore, at least one of the holding member and the pressing member is formed with a light-shielding portion for preventing leakage of stray light, so that the light from the front end surface of the reflection member and the outer peripheral surface of the light guide can be blocked. Light leaks through the gaps between. Accordingly, it is possible to prevent the occurrence of stray light due to light emission from the gap. As a result, it is possible to prevent the reading area on the document surface from being irradiated with light having an undesired illuminance distribution due to stray light.

According to the linear light source device of the present invention, furthermore, the holding member and the pressing member are formed of a black resin material, so that the light reflected on the document surface can be absorbed by the holding member and the pressing member. Thereby, it is possible to prevent the light reflected by the holding member and the pressing member from re-irradiating the document surface directly or via the light guide.

In addition, the light reflected on the document surface and incident on the light guide body via the holding member and the pressing member becomes a factor causing light intensity dispersion in the light emitted from the light guide body. In addition, if light that does not have the desired illuminance distribution due to the light with such light quantity variance is irradiated to the reading area on the document surface, the color reproducibility of the document will be reduced.

Description of drawings

1 is an explanatory cross-sectional view showing the configuration of a main part in a linear light source device according to a first embodiment of the present invention.

Fig. 2 is an explanatory cross-sectional view showing the configuration of a reflection member in the linear light source device of Fig. 1 .

3 is a plan view showing a state in which a holding member is arranged on a power supply substrate in the linear light source device of FIG. 1 .

4 is a plan view showing a state in which a holding member and a reflection member are arranged on a power supply substrate in the linear light source device of FIG. 1 .

5 is a plan view showing a state in which a holding member, a reflection member, and a pressing member are arranged on a power supply substrate in the linear light source device of FIG. 1 .

6 is an explanatory cross-sectional view showing the configuration of a main part in a linear light source device according to a second embodiment of the present invention.

FIG. 7 is a view showing a state in which a holding member is arranged on a power supply substrate with respect to the linear light source device of FIG. 6 .

8 is a plan view showing a state in which a holding member and a reflection member are arranged on a power supply substrate in the linear light source device of FIG. 6 .

9 is a plan view showing a state in which a holding member, a reflection member, and a pressing member are arranged on a power supply substrate in the linear light source device of FIG. 6 .

Fig. 10 is an exploded perspective view showing the structure of the main part of the linear light source device in Fig. 6 with the light guide removed.

FIG. 11 is an explanatory sectional view showing the structure of an example of a conventional document reading device.

Fig. 12 is an explanatory cross-sectional view showing the configuration of main parts in an example of a conventional linear light source device.

Detailed ways

<First Embodiment>

Hereinafter, embodiment of the linear light source device of this invention is demonstrated.

1 is an explanatory cross-sectional view showing the structure of a main part of the linear light source device according to the first embodiment of the present invention, FIG. 2 is an explanatory cross-sectional view showing the structure of a reflection member, and FIGS. A plan view of a state in which a holding member, a reflection member, and a pressing member are arranged on a power supply substrate.

This linear light source device has a rod-shaped light guide 10 formed of a translucent resin such as acrylic resin. In the light guide body 10, a light emitting surface 11 whose outer peripheral profile is an arc shape in a section perpendicular to its longitudinal direction is formed along the longitudinal direction of the light guide body 10, and on the peripheral surface opposite to the light emitting surface 11 The microprism group 12 is formed.

The light guide 10 is supported directly or via a suitable support on a base (not shown) formed of a rigid metal such as aluminum extending in the longitudinal direction of the light guide 10 .

At one end of the light guide 10 , a light emitting element 17 formed of an LED light source or the like is disposed so as to face the one end surface 10A of the light guide 10 . Specifically, on the power supply substrate 16 arranged to face the one end surface 10A of the light guide 10, the light emitting element 17 is arranged in a state of being electrically connected, and further, a light emitting element 17 is provided so as to cover the light emitting element 17. The hemispherical sealing body 18 is formed of a light-transmitting heat-resistant resin such as silicone resin.

The power supply substrate 16 forms a power supply pattern on a metal plate made of copper or the like via an insulating layer formed of a resin such as a resist, and the power supply pattern is covered with an insulating layer. A power supply (not shown) for supplying power.

The linear light source device of this example has a cross-sectional L-shaped support member 19 (refer to FIG. 10 ), and the support member 19 has a base plate 19a (refer to FIG. 10 ) perpendicular to the longitudinal direction of the light guide body 10, and a connection between the base plate 19a and the base plate 19a. The side plate 19b has a continuous periphery and extends in the longitudinal direction of the light guide body 10 (see FIG. 10 ). The supporting member 19 is formed of metal such as aluminum, for example.

And, on the surface of the bottom plate 19a in the support member 19, the power supply substrate 16 is arranged and fixed, and on the other hand, the side plate 19b in the support member 19 is connected to the light guide body on the base on which the light guide body 10 is fixed. 10 common ground is fixed.

Between the power feeding substrate 16 and the light guide body 10 is provided a reflective member 20 for reflecting light from the light emitting element 17 to enter the one end surface 10A of the light guide body 10 .

The reflection member 20 includes: a cylindrical reflection surface forming portion 21 extending in the longitudinal direction of the light guide 10; and a plate-shaped flange portion 23 integrally formed continuously with the front end of the reflection surface formation portion 21, and It extends in a direction perpendicular to the longitudinal direction of the light guide body 10 . The inner surface of the reflective surface forming portion 21 is a tapered reflective surface 22 whose diameter increases from the base end near the power supply substrate 16 to the front end near the light guide 10 .

The reflection member 20 is a metal member formed by drawing a metal plate such as an aluminum plate. Specifically, a depression constituting the reflection surface 22 of the reflection surface forming portion 21 was formed by deep drawing, and a through hole serving as the base end opening 21a was formed in the bottom surface of the depression to obtain the reflection member 20 .

The opening 21a at the base end of the reflective member 20 has an inner diameter larger than the maximum outer diameter of the sealing body 18 surrounding the light emitting element 17 inside.

The flange portion 23 of the reflective member 20 has a shape and a size such that the flange portion 23 does not penetrate the through hole 32 when the reflective surface forming portion 21 is fitted into the through hole 32 of the holding member 31 described later.

The surface roughness Ra of the reflective surface 22 in the reflective surface forming portion 21 of the reflective member 20 is, for example, 0.01 to 0.5 μm.

And, the reflective member 20 is fixed to the power supply board 16 in a state where the holding member 31 is arranged on the side of the opening 21 a at the proximal end of the reflective member 20 , and the pressing member 35 is arranged on the side of the opening 21 b at the front end of the reflective member 20 . The flange portion 23 of the reflective member 20 is sandwiched between them.

Regarding the holding member 31, for example, a rectangular insulating substrate formed of a resin material such as black polycarbonate resin and extending in a direction perpendicular to the longitudinal direction of the light guide body 10 is formed. The reflection surface forming portion 21 has a through hole 32 having a larger inner diameter than the maximum outer diameter. Furthermore, in this holding member 31 , two screw holes 31 h, 31 h are formed at positions away from the through hole 32 .

The holding member 31 is made of an insulating substrate, so that insulation from the power supply substrate 16 can be ensured.

The thickness of the holding member 31 (the width in the longitudinal direction of the light guide 10 ) is larger than the height of the reflection surface forming portion 21 (the length in the longitudinal direction of the light guide 10 ). By making the thickness of the holding member 31 larger than the height of the reflective surface forming part 21, it is possible to prevent the following situation: when the reflective member 20 is aligned and fixed to the power supply substrate 16, the base end surface of the reflective surface forming part 21 and the power supply substrate 16 will be prevented. The surface of the contact will destroy the insulating layer, thereby damaging the power supply pattern.

The pressing member 35 is formed, for example, at the center of a substantially rectangular insulating substrate formed of a resin material such as black polycarbonate resin and extending in a direction perpendicular to the longitudinal direction of the light guide 10. The outer diameter of the end portion of 10 matches the inner diameter of the light-transmitting hole 36 . In addition, in the pressing member 35 , two screw holes 35 h, 35 h are formed at positions away from the light transmission hole 36 and corresponding to the screw holes 31 h, 31 h of the holding member 31 .

The thickness of the pressing member 35 (width in the longitudinal direction of the light guide 10 ) is larger than the thickness of the space provided between the reflection member 20 and the light guide 10 in consideration of expansion and contraction of the light guide 10 . With such a configuration, the pressing member 35 can be used as a light shielding portion for preventing leakage of stray light.

In the linear light source device of the present invention, the reflection member 20 and the light guide body 10 are provided with respect to the power supply substrate 16 on which the light emitting elements 17 are arranged in the following manner.

That is, first, the holding member 31 is opposed to each other in a state where the sealing body 18 of the power supply substrate 16 is inserted into the through hole 32 of the holding member 31 and the screw holes 31h, 31h correspond to the screw holes (not shown) of the power supply substrate 16 . It is installed on the power supply substrate 16 . Next, the reflecting surface forming portion 21 of the reflecting member 20 is inserted into the through hole 32 of the holding member 31, and the sealing body 18 of the power supply substrate 16 is inserted into the cylinder of the reflecting surface forming portion 21 to accommodate the reflective surface. The member 20 is provided with respect to the power supply substrate 16 . Furthermore, the pressing member 35 is opposed so that the light-transmitting hole 36 of the pressing member 35 corresponds to the opening 21b at the front end of the reflection member 20 and the threaded holes 35h, 35h correspond to the threaded holes (not shown) of the power supply board 16 . Lamination is performed on the power supply substrate 16 . Next, common screws (not shown) are inserted through the threaded holes 35h, 35h of the pressing member 35, the threaded holes 31h, 31h of the holding member 31, and the threaded holes of the power supply board 16 to fasten and connect the reflecting member. The flange portion 23 of the reflecting member 20 is held between the holding member 31 and the pressing member 35 to fix the reflecting member 20 .

Then, one end of the light guide 10 is inserted into the light-transmitting hole 36 of the pressing member 35 , and the reflective member 20 is arranged so that the reflective surface 22 surrounds the optical path between the light emitting element 17 and the light guide 10 .

If an example of the size of each member of the linear light source device is given, then for the light guide 10, the total length is 340mm, the maximum diameter is 6.0mm, the size of the power supply substrate 16 is 7mm×22mm×0.7mm, and the size of the light emitting element 17 is It is 3.0mm * 4.5mm * 2.0mm, and the maximum outer diameter of sealing body 18 is 2.6mm; For reflective member 20, the height of reflective surface forming part 21 is 1.6mm, and the internal diameter of the opening 21a of the base end of reflective surface forming part 21 is 3.3mm, the inner diameter of the opening 21b at the front end of the reflective surface forming portion 21 is 4.5mm, the thickness of the reflective member 20 is 0.3mm, the size of the holding member 31 is 20mm×9.0mm×5.0mm, and the size of the pressing member 35 is 19mm× 7.0mm×0.8mm.

In the above-mentioned linear light source device, the light emitted from the light emitting element 17 is directly or reflected by the reflective surface 22 of the reflective member 20 and enters the light guide body 10 from one end surface 10A of the light guide body 10, and the incident light passes through the light guide body. The light body 10 is reflected on its peripheral surface and is guided along the length direction of the light guide body 10, and is reflected toward the light exit surface 11 by the micro prism group 12, and the reflected light is emitted from the light exit surface 11 of the light guide body 10, and For example, it is irradiated onto the document surface of the document placed on the document table.

Furthermore, according to the linear light source device of the present invention, since the reflection member 20 is formed by drawing, it is possible to suppress individual differences in the specularity of the reflection surface 22 of the reflection member 20 . Furthermore, since the reflective member 20 is fixed in a state where the flange portion 23 of the reflective member 20 is sandwiched between the holding member 31 and the pressing member 35, the reflective member 20 can be pressed with a large contact area, Thereby, greater frictional resistance can be obtained. Therefore, the deformation of the reflective member 20 and the accompanying displacement can be suppressed, and the expected optical performance such as the mirror surface state of the reflective member 20 can be prevented from being impaired. As a result, the variation in illuminance among the linear light source devices can be suppressed.

In addition, since the reflective member formed by deep drawing becomes thin, deformation due to screw fastening and accompanying displacement easily occur. Specifically, if the reflective member formed by deep drawing is screwed, the contact area between the screw and the reflective member is only the seat surface of the head of the screw. Excessive stress is applied to the member, causing it to bend, causing plastic deformation. Furthermore, depending on stress changes and conditions such as temperature changes and external vibrations, the plastic deformation of the reflection member may further develop, thereby impairing the fastening force of the screws and causing the screws to fall off. Occurrence of such deformation and misalignment adversely affects the mirror surface state of the reflection member, and individual differences in mirror surface properties of the reflection member become large.

According to the linear light source device of the present invention, furthermore, the holding member 31 and the pressing member 35 are fixed in a state penetrating with common screws, so that misalignment of the reflection member 20 can be further suppressed. Therefore, the reflective member 20 can be arranged with higher positional accuracy. As a result, variation in illuminance among linear light source devices can be further suppressed.

According to the linear light source device of the present invention, furthermore, a light-shielding portion for preventing stray light from leaking is formed on the pressing member 35, so that the gap between the front end surface of the reflection member 20 and the outer peripheral surface of the light guide 10 can be blocked. Leaked light. Accordingly, it is possible to prevent the generation of stray light due to light emission from the gap. As a result, it is possible to prevent the reading area on the document surface from being irradiated with light having an undesired illuminance distribution due to stray light.

According to the linear light source device of the present invention, the holding member 31 and the pressing member 35 are formed of black resin material, so that the light reflected on the document surface can be absorbed by the holding member 31 and the pressing member 35 . Thereby, it is possible to prevent the light reflected by the holding member 31 and the pressing member 35 from re-irradiating the document surface directly or via the light guide.

In addition, the light reflected on the document surface and incident on the light guide 10 via the holding member 31 and the pressing member 35 is a factor causing light intensity dispersion in the light emitted from the light guide 10 . In addition, if light that does not have the desired illuminance distribution due to the light with such light quantity variance is irradiated to the reading area on the document surface, the color reproducibility of the document will be reduced.

As mentioned above, although 1st Embodiment of this invention was demonstrated, this invention is not limited to said embodiment, Various changes are possible.

For example, in the case where the flange portion 23 of the reflection member 20 has a shape that covers the positions corresponding to the screw hole 31h of the holding member 31 and the screw hole 35h of the pressing member 35, it can be formed in the position corresponding to the screw hole 31h and the screw hole 35h. The position corresponding to the hole 35h is provided with a threaded hole structure. With such a configuration, the holding member 31 , the reflective member 20 , and the pressing member 35 can be fixed in a state where the common screw passes through each, and the misalignment of the reflective member 20 can be further suppressed.

<Second Embodiment>

6 is a cross-sectional view for explaining the structure of the main part in the linear light source device according to the second embodiment of the present invention, and FIGS. 10 is an exploded perspective view showing the structure of the main part of the linear light source device in FIG. 6 in a state where the light guide is detached.

This linear light source device has the same configuration as that of the linear light source device according to the first embodiment except that the outer shapes of the holding member 51 , the flange portion 43 of the reflection member 40 , and the pressing member 55 are different. Members having the same configuration as those of the linear light source device according to the first embodiment are denoted by the same symbols.

In addition, in FIG. 10 , 13 is a circuit board electrically connected to the power supply board 16 , 14 is a heat sink having a heat sink 14 a , and 14 h and 16 h are screw holes.

Specifically, the reflective member 40 has the reflective surface forming portion 21 having the same structure as the reflective member 20 in the linear light source device according to the first embodiment, and a notch 43a for locking is formed on one side as a flange portion. 43. In FIGS. 8 and 10 , 40h is a threaded hole.

The pressing member 55 has a threaded hole 35h having the same structure as the pressing member 35 in the linear light source device according to the first embodiment, and is formed in the center of the insulating substrate in an outer diameter shape similar to that of the end of the light guide 10. The notch 56 for light transmission which fits and has a part of an arc is substituted for the hole 36 for light transmission which concerns on 1st Embodiment. Furthermore, a notch 55a for locking is formed on one side of the outer shape, and a protruding portion 55b for locking is formed on the side opposite to the side.

The holding member 51 has: a convex portion 53a for engaging the reflective member 40 and the pressing member 55, which is formed over the entire length of one side of the outer edge of the rectangle; The two ends of the side of the pressing member 55 correspond to the protruding portion 55b for locking. By forming these engaging convex parts 53a, 53b, 53c, in the holding member 51, the recessed part 53d is formed in the part surrounded by these engaging convex parts 53a, 53b, 53c.

In addition, on the convex portion 53a for engagement of the holding member 51, a positioning protrusion 53a1 of a shape to fit into the notch 43a for locking of the reflection member 40 is formed in a state protruding toward the concave portion 53d side, and a protrusion for pressing is formed. The positioning protrusion 53a2 of the shape which the notch 55a of the member 55 fits. These positioning protrusions 53a1 and 53a2 have shapes different from each other. That is, the locking cutout 43 a of the reflection member 40 and the cutout 55 a of the pressing member 55 have different shapes.

The thickness of the convex portion 53 a for engagement of the holding member 51 (the size in the longitudinal direction of the light guide 10 ) is smaller than that of the space provided between the reflection member 40 and the light guide 10 in consideration of the expansion and contraction of the light guide 10 . thick. With such a configuration, the engaging convex portion 53 a of the holding member 51 can be used as a light shielding portion for preventing leakage of stray light.

In addition, in the linear light source device according to the second embodiment, the reflective member 40 is fitted into the linear light source device in a state where the notch 43 a for locking is engaged with the protrusion 53 a 1 for positioning of the protrusion 53 a for engagement of the holding member 51 . Recess 53d. Then, the protruding portion 55b for locking is fitted into the convex portions 53b and 53c for engagement of the holding member 51, and the notch 55a of the pressing member 55 is fitted with the protrusion 53a2 for positioning of the convex portion 53a for engagement of the holding member 51. state, the pressing member 55 is fitted into the concave portion 53d. In this state, the holding member 51 , the reflecting member 40 and the pressing member 55 are firmly connected to the power supply substrate 16 by screws 58 , 58 .

According to such a linear light source device, the same effect as that of the linear light source device according to the first embodiment can be obtained, and the misalignment of the reflection member 40 and the pressing member 55 can be further suppressed. Therefore, the reflective member 40 can be arranged with high positional accuracy. In particular, when the pressing member 55 is screwed to the holding member 51, since the reflection member 40 sandwiched between them can be prevented from rotating, it is possible to prevent damage to the expected optical performance such as the mirror surface state of the reflection member 40. . As a result, variation in illuminance among linear light source devices can be further suppressed.

As mentioned above, although 2nd Embodiment of this invention was demonstrated, this invention is not limited to said embodiment, Various changes are possible.

Claims (6)

1. a linear light source device, comprising: bar-shaped light conductor; Light-emitting component, is configured on substrate, and relative with end face on the length direction of this light conductor and configure; And reflecting member, by from the light optically focused of described light-emitting component transmitting to the end face of described light conductor, described linear light source device is characterised in that,

Described reflecting member has the reflecting surface of taper, described reflecting surface along with from be positioned near the cardinal extremity of the position of described light-emitting component towards being positioned near the front end of the position of described light conductor enlarged-diameter,

Described reflecting member forms by metallic plate is carried out to drawing processing, and the reflecting surface forming portion that is described reflecting surface by inner surface and forming with the tabular flange part that the front end of this reflecting surface forming portion extends continuously,

Described reflecting member is being disposed at described substrate under following state: be disposed at this reflecting member base end side retaining member and be disposed between the pressing member of front of this reflecting member, clamping has the flange part of this reflecting member.

2. linear light source device according to claim 1, is characterized in that,

Be formed with holding section at described retaining member, described holding section prevents the displacement of described reflecting member with respect to this retaining member.

3. linear light source device according to claim 1, is characterized in that,

Be formed with holding section at described retaining member, described holding section prevents the displacement of described pressing member with respect to this retaining member.

4. linear light source device according to claim 1, is characterized in that,

At least one party in described retaining member and described pressing member is formed with and prevents that veiling glare from leaking the light shielding part of use.

5. linear light source device according to claim 1, is characterized in that,

Described retaining member, described reflecting member and described pressing member are by being connected and be fixed by the screw sharing respectively.

6. linear light source device according to claim 1, is characterized in that,

Described retaining member and described pressing member are formed by the resin material of black respectively.