TW201425802A - Linear light source apparatus - Google Patents

Abstract

A light guide body (1) extends in the long axis direction, and has a reflecting region formed therein over the whole area in the long axis direction for the purpose of outputting light from the side surface thereof, said light having been inputted from the end surface thereof in the long axis direction and traveled inside. Holders (5a, 5b) are fitted in the opened side of a housing (8), said opened side being at one housing end portion in the long axis direction, and hold a light source, and the one end portion of the light guide body (1), said end portion being in the long axis direction. A light source substrate (3) is disposed such that the mounting surface where the light source is to be mounted faces holder (5a, 5b) end surfaces in the long axis direction, and a housing (8) end surface in the long axis direction, and an outer edge of the light source substrate is on the same plane with the holders (5a, 5b) and the housing (8). A connector (4) inputs, from the outside, power to be supplied to the light source. The connector (4) is mounted on the mounting surface side of the light source substrate (3), said mounting surface facing the housing (8) end surface in the long axis direction, and the housing (8) is provided with a recessed section (8a) such that the housing does not interfere with the connector (4).

Description

Linear light source device

The present invention relates to a linear light source device using a light guide.

A line source for image reading (see, for example, Patent Document 1) in which an LED light source is disposed at an end of a rod-shaped light guide and placed on an epoxy resin material or the like is disclosed. In the line source for image reading, a reed-like connector that supplies power to the LED light source is provided on the substrate.

Further, a lighting module (see, for example, Patent Document 2) having a casing including a member that emits light, a base portion corresponding to the opening portion, and at least one provided on the base portion is disclosed Side mounting section. In the lighting module, the light source unit is disposed in a mounting portion of the outer casing. The light guide plate is disposed inside the outer casing and optically coupled to the light source portion. The diffuser plate is disposed inside the outer casing and disposed on the lower side of the light guide plate. In the lighting module, the external power source is electrically connected (or connected to another lighting module), and at least one connector that supplies electric power to the light source unit is provided on a surface (outer surface) on the outer side of the base.

[Prior patent documents] [Patent Literature]

[Patent Document 1] JP-A-2012-60356

[Patent Document 2] JP-A-2011-222516

The wire light source connector for image reading disclosed in Patent Document 1 has a reed shape and is not fixed to a casing or the like. Therefore, the connector is not easy to assemble and disassemble with other connectors, and the handling of the connector is inconvenient. Further, there is a need for a holding member that is held in the fitting portion of the connector with the external connector, which is inconvenient.

In the illumination module disclosed in Patent Document 2, since the connector is fixed to the base, although the handling thereof is easy, it protrudes from the outer surface of the base. Therefore, in the case where the lighting module and other devices are connected, it is necessary to provide the recess of the connector to the other device side.

The present invention has been made in order to solve the problems as described above, and an object of the invention is to provide a linear light source device which is easy to attach and detach with other connectors, and the connected device does not need to form a concave portion. It is easy to use.

In order to solve the problem, the linear light source device of the present invention is a linear light source device that emits light having a linear cross section, and includes a light guide body that is a columnar member extending in the longitudinal direction and is long. a reflection region for emitting light that is incident from the end surface in the long axis direction and traveling inside is emitted from the side surface as a whole; the light source is an end surface that emits light into one of the long axis directions of the light guide body; , accommodating the light guide body so that the light emitted from the side surface of the light guide body passes The opening has an opening surface formed to extend in the longitudinal direction; the seat is fitted to the opening surface side of one end portion of the longitudinal direction of the casing, and holds one end of the longitudinal direction of the light guiding body And a light source; the light source substrate, the assembly surface assembled by the light source is disposed to face the end surface in the longitudinal direction of the seat and the end surface in the longitudinal direction of the housing, and the outer edge is flush with the seat and the housing; and In order to input electric power supplied to the light source from the outside, the connector is fitted to the connector of the external device; the connector is assembled on the side of the assembly surface of the light source substrate facing the end surface in the longitudinal direction of the casing; The recess is set so as not to interfere with the connector.

According to the invention, the connector provided for supplying electric power to the light source is fixed to the assembly surface of the light source substrate facing the casing, and is housed in the recess provided in the casing. That is, the connector is fixed to the light source substrate so as not to protrude from the casing. Therefore, it is easy to disassemble and attach to other connectors, and the connected device does not need to form a concave portion, and a linear light source device with excellent usability can be obtained.

1‧‧‧Light guide

2‧‧‧Light source

3‧‧‧Light source substrate

4‧‧‧Connector

5‧‧‧

5a‧‧‧ Block (Extended section)

5b‧‧‧ Block (same section)

6‧‧‧ Thermal Conductor

7‧‧‧ Department of heat dissipation

8‧‧‧Shell

8a‧‧‧ recess

8b‧‧‧Long slot

9‧‧‧ Thermal Conductor

10‧‧‧Optical components

11‧‧‧ Screws (installation means)

101, 102‧‧‧ linear light source device

Fig. 1 is an external view of the linear light source device according to the first embodiment of the present invention as viewed from the side opposite to the light emitting side.

Fig. 2 is an external view of the linear light source device according to the first embodiment of the present invention as seen from the light emitting side.

Fig. 3A is a cross-sectional view showing the linear light source device according to the first embodiment of the present invention cut in the longitudinal direction.

Fig. 3B is an enlarged cross-sectional view of Fig. 3A.

Fig. 4 is an exploded view of the linear light source device according to the first embodiment of the present invention as viewed from the side opposite to the light emitting side.

Fig. 5 is an exploded view of the linear light source device according to the first embodiment of the present invention as seen from the light emitting side.

Fig. 6 is an enlarged exploded view of Fig. 4.

Fig. 7 is an exploded view showing the vicinity of a light source substrate of the linear light source device according to the first embodiment of the present invention.

Fig. 8A is an external view of a seat of the linear light source device according to the first embodiment of the present invention.

Figure 8B is an exploded view of the seat of Figure 8A.

Fig. 9 is a view showing a path of light in the linear light source device according to the first embodiment of the present invention.

Fig. 10A is a cross-sectional view showing a state in which the linear light source device according to the second embodiment of the present invention is cut in the longitudinal direction.

Fig. 10B is an enlarged cross-sectional view of Fig. 10A.

Fig. 11 is an exploded view of the linear light source device according to the second embodiment of the present invention as viewed from the side opposite to the light emitting side.

Fig. 12 is an exploded view of the linear light source device according to the second embodiment of the present invention as seen from the light emitting side.

Fig. 13 is an enlarged exploded view of Fig. 11.

First embodiment

The first embodiment of the present invention will be described in detail using the drawings. In the first embodiment, the appearance of the linear light source device 101 according to the first embodiment of the present invention is observed from the side opposite to the light emission side (bottom side). In the second drawing, the appearance when the linear light source device 101 is viewed from the light emitting side (upper side) is shown. Fig. 3A shows a cross section when the linear light source device 101 is cut in the longitudinal direction. Fig. 3B is a cross-sectional view taken along line 3A, showing an enlarged cross-sectional view of the end portion of the linear light source device 101 in the longitudinal direction. Fig. 4 is an exploded view of the linear light source device 101 as seen from the side opposite to the light emission side (bottom side). Fig. 5 is an exploded view of the linear light source device 101 as seen from the light exit side. Fig. 6 is a part of an exploded view of Fig. 4, specifically, an exploded view showing an end portion of the linear light source device 101 in the longitudinal direction. Fig. 7 is an enlarged exploded view of the vicinity of the light source substrate of the linear light source device 101. Fig. 8A is an external view of the seat 5 of the linear light source device 101. Fig. 8B is an exploded view of the seat 5 of Fig. 8A.

The configuration of the linear light source device 101 according to the first embodiment of the present invention will be described with reference to Figs. 1 to 8B. The light guide 1 is shown in FIGS. 3A, 3B, 4, 5, and 6. The light guide 1 is formed of a transparent resin. The light guide 1 is formed of a transparent resin. As shown in FIGS. 3A, 4, and 5, the light guide 1 is a columnar member extending in the longitudinal direction (long axis direction). The light guide 1 has a reflection region formed integrally in the longitudinal direction. As shown in Fig. 4, Fig. 5, and Fig. 6, in the present embodiment, in the present embodiment, the side surface of the light guide 1 has a cylindrical shape, but the side surface shape of the light guide 1 is not limited to a circle. Cylindrical. For example, it can be an ellipse or a combination of 2 circles. shape. In the light guide body 1, a reflection region for emitting light traveling from the end surface in the long axis direction and traveling inside is formed integrally from the side surface in the longitudinal direction. The light incident from the inside of the light guide 1 from the end surface of the light guide 1 is reflected by the reflection region, and finally emitted as a light having a linear cross section extending from the side surface of the light guide 1 in the long axis direction.

The light source 2 is shown in FIGS. 3B and 7. Moreover, the light source substrate 3 is shown in FIGS. 3B, 4, 5, 6, and 7. The light source 2 is a light-emitting element such as an LED (Light Emitting Diode) light source. As shown in FIG. 3B, the light source 2 emits light toward one end surface of the light guide 1 in the longitudinal direction. The light source 2 is assembled to the light source substrate 3 by solder bonding or the like. The surface on which the light source 2 is assembled is referred to as an assembly surface. As shown in FIG. 3B, the assembly surface is a surface facing the end surface in the longitudinal direction of the seat 5 and the end surface in the longitudinal direction of the casing 8. Therefore, the light source 2 is incident on the end surface of one surface of the light guide body 1 in the long axis direction. As shown in FIG. 3B, the light source substrate 3 is disposed such that its outer edge is flush with the seat 5 and the casing 8. The connector 4 is shown in Figs. 1, 6 and 7. The connector 4 is a fitting portion that is fitted to a connector of an external device in order to input electric power supplied to the light source 2 from the outside. The light source 2 emits light by current driving from a power supply supplied from a connector 4 (see FIG. 1) assembled to the light source substrate 3 from the outside. As shown in FIGS. 6 and 7, the connector 4 is assembled to the assembly surface side of the light source 2 of the light source substrate 3. As shown in FIGS. 6 and 7, the assembly position of the connector 4 of the light source substrate 3 is outside the range facing the seat 5 to be described later, that is, the assembly surface, and the long axis direction of the casing 8 to be described later. The end faces are opposite to each other.

The holder 5 (5a, 5b) is shown in Fig. 2, Fig. 3A, Fig. 3B, Fig. 4, Fig. 5, Fig. 6, Fig. 8A and Fig. 8B. Block 5 series 2, 3B, and 6 are inserted into the opening surface side of the end portion of the casing 8 to be described later in the longitudinal direction. The seat 5 holds the end of one of the long axis directions of the light guide 1 and the light source 2. The seat 5 has a through hole into which the light guide 1 is inserted. An end portion of one of the longitudinal directions of the light guide 1 is inserted from one end of the through hole of the seat 5. Further, the light source substrate 3 assembled by the light source 2 is disposed from one end of the through hole of the seat 5. The light source substrate 3 is disposed such that the light source 2 faces the light guide 1 .

As shown in FIG. 3B, the diameter of the through hole of the seat 5 is increased from the light source 2 to the light guide 1. That is, the through hole has a tapered structure.

The optical component 10 is shown in FIGS. 3B, 4, 5, 6, and 8B. As shown in Fig. 3B, in the present embodiment, the optical unit 10 is inserted between the light source 2 and the light guide 1. The optical component 10 is a thin-wavelength module having a wavelength conversion property such as an IR (Infrared Ray) cut filter. By inserting the optical component 10, the wavelength characteristic of the light emitted from the light source 2 and incident on the light guide 1 can be adjusted. As shown in FIG. 3B, FIG. 4, FIG. 5, FIG. 6 and FIG. 8B, the seat 5 is divided into a seat 5a as a first seat and a seat 5b as a second seat in order to mount the optical unit 10. . As shown in Fig. 3B, in the through hole of the seat 5a, the diameter of the portion into which the light source 2 is inserted is matched with the light source 2 to have a uniform diameter, but in other portions, as the light source 2 is directed from the light source 2, the diameter gradually becomes Become bigger. Further, the diameter of the through hole of the seat 5b is uniform. Strictly, the optical unit 10 is held by the seat 5a and the seat 5b in a state of being embedded in the seat 5a and in contact with the seat 5b. The inner walls of the through holes of the seats 5a, 5b reflect or scatter light emitted from the light source 2. Thereby, the seat 5 can suppress the accidental light emitted from the light source 2 and the light guide 1.

As shown in FIG. 3B, the light source substrate 3 is interposed with the light source 2 On the reverse side, the heat conductor 6 and the heat radiating portion 7 are sequentially disposed. The heat conductor 6 transmits heat conducted from the light source substrate 3 to the heat radiating portion 7. The heat conductor 6 is formed, for example, in the form of a sheet-like sheet. Therefore, in the heat conductor 6, the adhesion and thermal conductivity are improved. The heat radiating portion 7 is formed of a metal having good thermal conductivity such as aluminum in the form of a plate or a fin. The heat radiating portion 7 is formed by extrusion molding or the like. The heat generated by the light emission of the light source 2 is transmitted to the heat radiating portion 7 via the light source substrate 3 and the heat conductor 6, and is radiated through the heat radiating portion 7.

The casing 8 is shown in Figs. 1, 2, 3A, 3B, 4, 5, 6, and 7. The casing 8 is an outer casing of the linear light source device 101. The casing 8 is formed of a metal such as aluminum. As shown in FIG. 3B and FIG. 5, the casing 8 is formed with a long groove 8b having an opening having a fixed width in a direction (width direction) orthogonal to the longitudinal direction so as to extend in the longitudinal direction. In the long groove 8b, the light guide body 1 held by the seat 5 is housed. Further, the long groove 8b is formed to cover the light guide body 1 accommodated, but a predetermined gap is formed between the inner surface of the long groove 8b and the light guide body 1 accommodated. The light propagating inside the light guide 1 is scattered or reflected by the reflection region of the light guide 1, and then emitted from the side surface of the light guide 1 and then emitted to the outside through the opening of the long groove 8b. Further, in order to increase the emission efficiency of the light emitted from the opening of the long groove 8b, a white ink or a white member may be applied to the inner surface of the long groove 8b. In the casing 8, the surface on which the opening of the long groove 8b is provided, that is, the surface on which the light is emitted is the upper surface (opening surface), and the surface on the opposite side is the bottom surface.

The seat 5, the light source board 3, the heat conductor 6 and the heat radiating portion 7 are fixed to the end portion of the casing 8 in the longitudinal direction by using a screw (mounting means) 11. The light source substrate 3 is covered and fixed to the end portion of the casing 8 so as to cover the end surface of the end portion of the casing 8 in the longitudinal direction. The connector 4 assembled to the light source substrate 3 is assembled with light and The bottom side of the casing 8 on the side where the injection side (opening surface) is opposite to the position where the seat 5 does not interfere. As shown in Fig. 6, the bottom surface of the casing 8 is provided in a recessed portion 8a which is recessed in the longitudinal direction at a position facing the connector 4 so that the casing 8 and the connector 4 do not interfere with each other. In the recess 8a, the length of the casing 8 in the width direction is longer than the length of the connector 4 in the width direction. Further, in the concave portion 8a, the length of the casing 8 in the longitudinal direction is longer than the length (height) of the connector 4 protruding from the light source substrate 3.

The casing 8 has a function of dissipating heat generated by the light source 2. The heat generated by the light source 2 is transmitted from the junction surface of the light source 2 and the light source substrate 3 to the light source substrate 3. The heat transmitted to the light source substrate 3 is transmitted from the joint surface of the light source substrate 3 and the heat conductor 9 to the heat conductor 9. The heat transmitted to the heat conductor 9 is transmitted from the joint surface of the heat conductor 9 and the casing 8 to the casing 8.

In Fig. 9, the path of the light of the linear light source device 101 is shown. The light emitted from the light source 2 is as shown by the arrow of Fig. 9, a part of the light is directly incident on the light guide 1, and the remaining light is reflected or scattered by the tapered portion of the inner wall of the seat 5a. The light guide 1 is incident. The light incident on the light guide 1 is advanced while the wall surface of the light guide 1 is repeatedly reflected, and a part of the light is incident on a white printed pattern or a concave-convex shape formed along the longitudinal direction of the light guide 1. region. A part of the light reflected in the reflection area is emitted from the side surface of the light guide 1. The light that is not incident on the reflection region is re-evolved in the light guide body 1 and is emitted from the end surface on the opposite side to the incident surface, and is scattered by the tapered portion of the other seat 5 and from the end face of the length of the light guide body 1. The light guide 1 is injected again. A part of the light that is incident again is reflected by the reflection area and emitted from the side surface of the light guide 1, and the remaining light is repeatedly emitted and re-injected from the end surface on the opposite side to the incident surface. By following this light path, Most of the light that has entered the inside of the light guide body 1 is a linear light whose cross section extends in the longitudinal direction, and is emitted from the side surface of the light guide body 1.

The electric power required for the light emission of the light source 2 is supplied from the outside via the connector 4. The connector 4 is fixed to the light source substrate 3, and since the position thereof is stable, the attachment and detachment work of the connector 4 and other connectors becomes easy. Further, since the connector 4 is covered by the recess 8a of the casing 8, the mechanical externality of the connector 4 can be prevented from being damaged by the connector 4. Thereby, the reliability of the connector 4 is improved. As described in the above detailed description, according to the present embodiment, the connector 4 provided for supplying electric power to the light source 2 is fixed to the assembly surface of the light source substrate 3 facing the casing 8, and is housed in the basket. The recess 8a of the body. That is, the connector 4 is fixed to the light source substrate 3 so as not to protrude from the casing 8. Therefore, it is easy to disassemble and attach to other connectors, and the connected device does not need to form a concave portion, and the linear light source device 101 which is easy to use can be obtained.

Second embodiment

The second embodiment of the present invention will be described in detail using the drawings. FIG. 10A is a cross-sectional view showing the linear light source device 102 according to the second embodiment of the present invention when it is cut in the longitudinal direction. In Fig. 10B, an enlarged view of Fig. 10A, that is, a cross section near the end portion of the linear light source device 102 in the longitudinal direction, is shown. Fig. 11 is an exploded view of the linear light source device 102 as seen from the side opposite to the light exiting side. Fig. 12 is an exploded view of the linear light source device 102 as seen from the light exit side. Fig. 13 is an enlarged view showing an enlarged end portion of the linear light source device 102 in the exploded view of Fig. 11 in the longitudinal direction. In the 10A, 10B, and 11th to 13th, the same components as those in the 3A, 3B, and 4 to 6 are denoted by the same reference numerals, and their description will be omitted.

As shown in FIG. 10B, the linear light source device 102 according to the second embodiment of the present invention is an optical component 10 such as an IR cut filter that is omitted from the linear light source device 101 according to the first embodiment of the present invention. Therefore, as shown in FIG. 10B, FIG. 11, FIG. 12, and FIG. 13, the seat 5 is different from the first embodiment of the present invention, and the portion of the seat 5a (the enlarged diameter portion of the through hole) is integrally formed. The part of the seat 5b (the same diameter).

In the linear light source device 102 according to the second embodiment of the present invention, the number of component points is smaller than that of the linear light source device 101 according to the first embodiment of the present invention, and the configuration thereof is simplified. Therefore, the manufacture of the device becomes easy.

Here, in this embodiment, the light source 2 is provided at both ends in the longitudinal direction of the light guide 1, but either one of them may be used. In this case, a light source 2 may be provided instead of the one, and a mirror may be provided.

The linear light source devices 101 and 102 of the respective embodiments are for reading an image. Such linear light source devices 101 and 102 are provided in optical devices such as a facsimile machine, a word processor, a photocopier, and an image scanner. These optical devices include: a linear light source device 101 (or a linear light source device 102), an image sensor, and an image sensor pair emitted from the linear light source device 101 (or the linear light source device 102) and An imaging optical system in which light reflected by a document surface receives light. In order to recognize the image information by the image sensor or the like, the thin line light is applied to the surface of the document to be read from the linear light source device 101 or the like. The light reflected by the original surface is imaged on the image sensor via a predetermined imaging optical system. The image of the original surface is read based on the image of the image imaged on the image sensor.

The present invention can be variously modified and modified without departing from the spirit and scope of the invention. Moreover, the above embodiments are used to say The inventors of the present invention are not intended to limit the scope of the invention. That is, the scope of the present invention is not expressed by the embodiment, but by the scope of the patent application. Further, various modifications made within the scope of the invention and the scope of the invention are also intended to be within the scope of the invention.

This patent application is based on Japanese Patent Application No. 2012-207231 filed on Sep. 20, 2012. The patent specification of the Japanese Patent Application No. 2012-207231, the entire patent application and the entire drawings are hereby incorporated by reference.

[Industrial Applicability]

The present invention is suitable for an optical machine such as an image scanner.

1‧‧‧Light guide

3‧‧‧Light source substrate

4‧‧‧Connector

5a‧‧‧ Block (Extended section)

5b‧‧‧ Block (same section)

6‧‧‧ Thermal Conductor

7‧‧‧ Department of heat dissipation

8‧‧‧Shell

8a‧‧‧ recess

9‧‧‧ Thermal Conductor

10‧‧‧Optical components

11‧‧‧ Screws (installation means)

Claims (7)

A linear light source device that emits light having a linear cross section, comprising: a light guide body, a columnar member extending in a long axis direction, and integrally formed in the long axis direction from the long axis direction a light-emitting area that emits light that is incident on the end surface and that is emitted from the side surface; the light source emits light into one end surface of the light guide body in the long-axis direction; and the housing receives the light guide body The opening through which the light emitted from the side surface of the light guide passes has an opening surface formed to extend in the longitudinal direction; and the seat is fitted into the opening of one end portion of the housing in the longitudinal direction a surface side and an end portion of the light guide body in the longitudinal direction and the light source; the light source substrate is configured such that an assembly surface of the light source is disposed in an end surface of the seat and the housing The end faces in the longitudinal direction are opposed to each other, and the outer edge is flush with the seat and the casing; and the connector is fitted to the connector of the external device for inputting electric power supplied to the light source from the outside; The connector is assembled to the long axis of the housing End surface opposed to the assembly surface of the light source side of the substrate; the housing, the recess arranged does not interfere with the connector. The linear light source device according to claim 1, wherein the seat has a through hole; and the end portion of the light guide body in the longitudinal direction and the light source are inserted into the through hole. A linear light source device as claimed in claim 2, wherein the light source is An optical component having wavelength conversion property of the passed light is inserted between the light guides, and the seat is divided into a first seat holding the light source and an end portion of the light guide body in the long axis direction. The second seat; the optical component is sandwiched between the first seat and the second seat. The linear light source device of claim 2, wherein the inner wall of the through hole reflects or scatters light emitted from the light source. The linear light source device of claim 4, wherein the through hole gradually increases in diameter as it goes from the light source to the light guide. The linear light source device according to any one of claims 1 to 5, wherein a heat dissipating portion is provided on a side opposite to the light source via the light source substrate. The linear light source device according to claim 6, wherein the base, the light source substrate, and the heat dissipating portion are fixed to an end portion of the light guide body in the longitudinal direction by using a mounting means.