JP3200811U - Linear light source assembly with FPC - Google Patents

Abstract

A compact and economical linear light source assembly is provided. A linear light source assembly includes a light guide bar having a patterned light emitting surface, a reflection holder, an LED light source module, and an FPC. The light guide bar is an elongated polygonal transparent material, and has a light scattering pattern on a light emitting surface from which light is emitted. The FPC is a flexible plastic substrate having a plurality of conductive traces and a plurality of FPC holes. The light guide bar is disposed on the reflection holder. The LED light source module is attached to the FPC. By inserting the holder post into the FPC hole, the FPC provided with the LED light source module is mounted on the reflection holder, and the LED light source module is arranged in accordance with the position of the light receiving end of the light guide bar. [Selection] Figure 1B

Description

  The present invention relates to a linear light source, and more particularly, a compact and economical linear light source including a light guide rod having a patterned light emitting surface and a light emitting diode (LED) light source module connected to a flexible printed circuit (FPC). The present invention relates to a linear light source assembly.

  A conventional scanner irradiates light on a target using a linear light source to acquire a target image. The quality of the acquired image largely depends on the performance of the linear light source, and the mismatch of the intensity and uniformity of the light source affects the accuracy of the image.

  The quality of the acquired image is not within a certain focal length and is also degraded when the effective focal length of the light source is exceeded.

  Further, the shape of a conventional linear light source is generally designed so that it can be easily assembled and molded. However, because of design limitations, control of light propagation efficiency and uniformity in terms of light diffusion and scattering is limited.

  For this reason, different approaches have been used to improve the uniformity and intensity of light, but it saves energy efficiently, improves the intensity and uniformity of the emitted light, and reduces the light rays within the effective focal length. Greater improvements are needed to increase uniformity.

  Furthermore, conventional linear light sources are not compact enough to meet current needs and are not cost effective. In order to survive market competition, smaller and lower manufacturing cost light sources are needed.

  Accordingly, a compact and economical light source can be provided using FPC, and an improvement to a linear light source having superior light intensity and uniformity is required.

  In order to achieve the above-mentioned improvements and other advantages and overcome the drawbacks of the prior art, the object of the present invention is to provide a compact and cost-effective linear light source assembly that can improve the quality and accuracy of the acquired image. It is.

  The linear light source assembly of the present invention includes a light guide bar having a patterned light emitting surface, a reflection holder, an LED light source module, and an FPC.

  The light guide bar of the present invention is disposed in the reflection holder, and the FPC to which the LED light source module is attached is connected to the reflection holder.

  The light guide bar is an elongated polygonal transparent material. The light guide bar is arranged in a holder such as a reflection holder or a box with a reflection window. The surface of the light guide rod is a light emitting surface from which light is emitted.

  The LED light source module includes, for example, one LED or a plurality of LEDs in an LED package. The LED light source module is a general top side LED module used for, for example, an LED television or an electric bulletin board. The production of such general LED modules is large-scale and increasing, their use is widespread, and general LED modules are extremely useful for reducing the unit cost of linear light source assemblies with FPC. It is an important driving force. This cost reduction is an advantage of the present invention.

  The LED light source module is arranged in accordance with the position of the light receiving end of the light guide bar.

  The LED light source module is attached to an FPC using surface mounting technology (SMT) or surface mounting type device (SMD).

  The FPC includes a flexible plastic substrate and a plurality of conductive traces. The FPC further has a plurality of FPC holes on the flexible plastic substrate.

  The holder covers all surfaces except the light emitting surface of the light guide bar. The holder includes a box with a window, and a portion other than the light emitting surface of the light guide bar is surrounded by the box, and light is emitted from the opening or the window of the box. The surface of the light guide bar surrounded by the reflection holder is a reflection surface that reflects light.

  The holder further comprises a plurality of holder posts provided on the end of the holder. At the time of assembly, the holder post is inserted into the FPC hole, and the FPC including the LED light source module is arranged and attached to the holder.

  When the light from the LED light source module is incident on the light receiving end or the end of the light guide rod, the light is reflected on one of the reflecting surfaces. This light is finally emitted from the light guide rod through the light emitting surface. The light emitting surface further has a light scattering pattern that serves to diffuse light. The light scattering pattern can have continuous valleys and / or peaks formed along the length of the light guide, and can have a slight slope or slope when viewed from the side.

  As described above, the light scattering pattern diffuses light by reflecting light to one or more valleys or peaks. Light is continuously propagated from the light receiving end toward the opposite end through the light guide rod, and is emitted from the surface through the valley or the peak. Further, the light emitted from the light emitting surface passes through various valleys and mountain parts and is refracted at various angles.

  According to the linear light source assembly of the present invention, the uniformity of light rays within the effective focal length can be enhanced. In addition, the linear light source assembly of the present invention provides a light source with a larger emission amount or uniform light beam that can accurately detect objects without light loss due to uneven or non-uniform intensity. it can. Furthermore, according to the linear light source assembly of the present invention, it is possible to provide a high-intensity linear light source that repeatedly reflects light in order to efficiently save light energy and greatly increase the intensity.

  Furthermore, according to the present invention, by using the FPC and the LED light source module SMD, the linear light source can be improved so as to have better light intensity and uniformity, thereby providing a more compact and economical light source. it can.

  For better understanding of the present invention, the drawings are attached as a part of the present specification. These drawings illustrate embodiments of the present invention and serve to explain the principles of the present invention.

1 is a perspective view showing a linear light source assembly in an embodiment of the present invention. 1 is an exploded perspective view showing a linear light source assembly in an embodiment of the present invention. It is a figure which shows the light guide rod of the linear light source assembly in the Example of this invention. It is sectional drawing which shows the light guide bar in the reflection holder of the linear light source assembly in the Example of this invention. It is sectional drawing which shows the light-scattering pattern on the light-guide rod light emission surface of the linear light source assembly in the Example of this invention. It is a figure which shows the reflection holder of the linear light source assembly in the Example of this invention. FIG. 3B is a cross-sectional view of the reflection holder and the light guide bar of the linear light source assembly according to the embodiment of the present invention, taken along section line AA of FIG. 3A. 3B is a cross-sectional view of the reflection holder and the light guide rod of the linear light source assembly according to the embodiment of the present invention, taken along section line BB in FIG. 3A. FIG. It is a figure which shows FPC of the linear light source assembly in the Example of this invention. 1 is a perspective view showing an LED light source module of a linear light source assembly in an embodiment of the present invention. It is a front view which shows the LED light source module of the linear light source assembly in the Example of this invention. It is a side view which shows the LED light source module of the linear light source assembly in the Example of this invention. It is a rear view which shows the LED light source module of the linear light source assembly in the Example of this invention. 1 is an exploded view showing a linear light source assembly in an embodiment of the present invention. 1 is an exploded view showing a linear light source assembly in an embodiment of the present invention. It is a front view which shows LED light source module and FPC of the linear light source assembly in the Example of this invention. It is a side view which shows LED light source module and FPC of the linear light source assembly in the Example of this invention. It is a perspective view which shows the linear light source assembly in the image acquisition apparatus submodule housing in the Example of this invention. It is sectional drawing which shows the linear light source assembly in the image acquisition apparatus submodule housing in the Example of this invention.

  Those skilled in the art can clearly understand the above-described objects of the present invention by reading the preferred embodiments described in detail below.

  The above-mentioned outline and details to be described later are representative examples, and are intended to explain the claimed invention in more detail.

  Now, preferred embodiments of the present invention will be described in detail. This embodiment is illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like elements.

  Please refer to FIG. 1A which is a perspective view showing a linear light source assembly in an embodiment of the present invention, and FIG. 1B which is an exploded perspective view showing the same linear light source assembly.

  The linear light source assembly 100 of the present invention includes a light guide bar 200, a reflection holder 300, an FPC 400, and an LED light source module 500.

  The light guide bar 200 is inserted into the opening at the end of the reflection holder 300 and held in the internal cavity of the reflection holder 300 that matches the shape of the light guide bar 200. In order to hold the light guide rod 200 in the reflection holder 300, at least one holder holding portion 350 is provided. In the embodiment shown in FIG. 1B, the holder holding portion 350 is disposed at the center portion of the reflection holder 300. In other embodiments, a larger number of holder holding portions 350 are used.

  The LED light source module 500 is attached to the FPC 400, and the FPC 400 is attached to the end of the reflection holder so that the LED light source module 500 is disposed corresponding to the light receiving end of the light guide bar 200.

  Power is supplied from the image acquisition device submodule to the LED light source module 500 via a conductive trace on the FPC 400. When the LED light source module 500 is turned on, light enters the light receiving end of the light guide bar 200. The light is reflected by the reflection holder 300 through the light guide bar 200 and is emitted from the light emitting surface of the light guide bar 200.

  2A is a view showing a light guide rod of the linear light source assembly in the embodiment of the present invention, and FIG. 2B is a cross-sectional view showing the light guide rod of the light guide rod in the reflection holder of the linear light source assembly. To do.

  The light guide bar 200 includes a polygonal cylindrical body made of a transparent or translucent material. In this embodiment, an octagonal cylindrical body is illustrated. However, in other embodiments, the number of sides of the light guide bar 200 is different. The light guide bar 200 is mainly used to convert a spot light source of the LED light source module into a linear light source. One of the surfaces of the light guide bar 200 is a light emitting surface 210 that emits linear light. The other surface is a reflection surface that reflects light by the reflection holder 300.

  Reference is made to FIG. 2C, which is a cross-sectional view showing a light scattering pattern on the light guide bar light emitting surface of the linear light source assembly in the embodiment of the present invention.

  In order to improve the intensity of light and increase the uniformity, in one embodiment, the light emitting surface 210 is inclined and has a jagged shape composed of peaks and troughs, and on the light emitting surface 210 of the light guide bar 200. A light scattering pattern 220 is formed. In the present invention, valleys 220 </ b> B and peaks 220 </ b> A are formed on the surface of the light emitting surface 210. When the valley 220B is formed on the reflection surface, the light reflected on the surface is refracted on the main body of the light guide bar 200. As a result, the uniformity of light can be improved, but the shadows of the remaining valleys or depressions become prominent beyond a certain range. Therefore, it is preferable that the valley 220 </ b> B is formed on the light emitting surface 210. As a result, it can be said that the present invention not only reduces the influence or shadow of the depression or valley, but also improves the uniformity.

  The light is reflected and refracted by the light guide bar 200 and the reflection surface of the reflection holder, and is emitted from the light scattering pattern 220 of the light emitting surface 210. The light can be adjusted to be more uniform by changing the angle of the valley. Since the light is directly emitted after being made uniform, the shadow of the recessed portion is not noticeable, and the allowable range of the effective focal length of the light is improved.

  In the present invention, the design of the valley 220B or the depression is closely related to the light uniformity. The angle of the valley 220B is generally between 0.03 and 0.15 degrees, and this angle increases gradually or from section to section. For example, if the tilt angle of one section is between 0.03 degrees and 0.09 degrees (eg 0.07 degrees), the tilt angle of another section is between 0.09 degrees and 0.15 degrees ( Example: 0.11 degree). Also, for example, when an increase in tilt angle is shown over three sections, if the tilt angle of the first section is between 0.03 degrees and 0.05 degrees (example: 0.04 degrees), 2 The inclination angle of the first section is between 0.05 degrees and 0.10 degrees (example: 0.08 degrees), and the inclination angle of the third section is between 0.10 degrees and 0.15 degrees ( Example: 0.12 degrees).

  Of course, other tilt angles can be varied as required. For example, in one embodiment, the tilt angle increases linearly or logarithmically from one end of the light guide bar 200 to the opposite end.

  FIG. 3A is a diagram showing a reflection holder of the linear light source assembly in the embodiment of the present invention, and a sectional view of the reflection holder and the light guide rod of the linear light source assembly along the cutting line AA of FIG. 3A. Reference is made to FIG. 3B and FIG. 3C, which is a cross-sectional view along section line BB of FIG. 3A.

  The reflection holder 300 has an elongated body that holds the light guide bar 200 and reflects light toward the light emitting surface 210 of the light guide bar 200. The internal cavity of the reflection holder 300 has a shape that matches the shape of the outer surface of the light guide bar 200.

  The reflection holder 300 further includes a plurality of holder posts 330 disposed on the holder end plate 360 of the reflection holder 300. The plurality of holder posts 330 are inserted into the FPC holes of the FPC 400, so that the FPC 400 is mounted on the reflection holder 300, and the LED light source module is arranged in accordance with the position of the light receiving end of the light guide bar 200.

  The reflection holder 300 further includes at least one holder holding portion 350 that holds the light guide rod 200 in the cavity of the holder. The holder holding part 350 extends from the wall surface of the reflection holder 300 and holds the surface of the light guide bar 200 from both sides of the light emitting surface 210.

  Reference is made to FIG. 4, which is a diagram showing an FPC of a linear light source assembly in an embodiment of the present invention.

  The FPC 400 includes a flexible substrate 430, a plurality of conductive traces 410, and a plurality of FPC holes 420.

  The plurality of conductive traces 410 are paths for electrically coupling the power sources of the LED light source module and the image acquisition device submodule.

  The plurality of FPC holes 420 are provided as means for attaching the FPC 400 to the reflection holder by inserting a holder post.

  5A is a perspective view showing the LED light source module of the linear light source assembly in the embodiment of the present invention, FIG. 5B is a front view showing the module, FIG. 5C is a side view showing the module, and the module. Reference is made to FIG. 5D, which is a rear view shown.

  The LED light source module 500 provides a light source for a linear light source assembly. The LED light source module 500 further includes a plurality of LEDs 510, a module housing 520 and a plurality of LED conductors 530.

  The LED 510 is disposed in the module housing recess 521 of the module housing 520. The plurality of LED conductors 530 provide a conductive path for power to flow from the conductive trace to the LED 510.

  Please refer to FIG. 6A and FIG. 6B which are exploded views showing the linear light source assembly in the embodiment of the present invention.

  One end of the light guide bar 200 is a light receiving end 250. When the LED light source module 500 and the light guide bar 200 are assembled, the light receiving end 250 corresponds to the LED of the LED light source module 500. Therefore, the light from the LED enters the light guide bar 200 via the light receiving end 250 and is guided. Disperse through the structure of the light rod 200.

  The reflection holder 300 covers most of the light guide bar 200 other than the light emitting surface 210, so that the reflection effect is enhanced and the intensity of the emitted light is improved. In order to allow light to pass therethrough, an exit opening is formed at a portion corresponding to the light emitting surface 210 of the light guide bar 200 in the reflection holder 300. The other surface of the light guide bar 200 is a reflection surface and is covered with the reflection holder 300.

  After the light is incident on the light guide bar 200, the light is reflected by the reflection surface of the light guide bar 200 and the reflection holder 300, and the intensity of the light is increased. After the light is reflected, it is emitted from the light emitting surface 210 through the emission opening of the reflection holder 300.

  During assembly, when the light guide bar 200 is inserted into the holder opening 320 at the end of the reflection holder 300, the light guide bar 200 is held in the holder cavity 310 of the reflection holder 300 that matches the shape.

  When the light guide bar 200 is completely inserted, parts other than the light emitting surface 210 of the light guide bar 200 are covered with the reflection holder 300. Since the function of the reflection holder 300 is to reflect light, the color of the reflection holder 300 is selected to be a highly reflective color such as white, silver, or silver white.

  When the light guide bar 200 is completely inserted into the holder cavity 310 of the reflection holder 300, the FPC 400 to which the LED light source module 500 is attached is assembled to the reflection holder 300. The holder post 330 on the holder end plate 360 is inserted into the FPC hole of the FPC 400. When staking (caulking) such as heat staking or thermoplastic staking is performed, the holder post 330 is deformed, the FPC 400 and the reflection holder 300 are united and fixed, and the LED of the LED light source module 500 is a light guide bar. It is arranged at the position of the light receiving end 250 of 200.

  Please refer to FIG. 7A which is a front view showing the LED light source module and the FPC of the linear light source assembly in the embodiment of the present invention, and FIG. B which is a side view showing the LED light source module and the FPC.

  The LED light source module 500 includes a surface mount device (SMD). The LED light source module 500 is attached to an FPC using a surface mount technology (SMT) and a surface mount device (SMD). For example, the LED conductor 530 and the conductive trace 410 are connected and electrically coupled by surface mounting soldering, and the LED light source module 500 and the FPC 400 are assembled.

  After the LED light source module 500 and the FPC 400 are connected, the conductive trace 410 becomes a conductive path for transmitting power from the image acquisition device submodule to the LED 510 of the LED light source module 500.

  Reference is made to FIG. 8A, which is a perspective view showing a linear light source assembly in an image acquisition device sub-module housing in an embodiment of the present invention, and FIG. 8B, which is a sectional view of the linear light source assembly.

  The linear light source assembly of the present invention is installed in the image acquisition device sub-module housing 50 after assembly. The image capture device sub-module housing 50 holds the linear light source assembly in place so that optimum performance can be maintained during use of the main image capture device.

  It will be apparent to those skilled in the art that various modifications can be made without departing from the scope and spirit of the present invention. In view of the above, all the various changes and color changes made without departing from the scope of the present invention are included in the present invention and correspond to the present invention.

50 Image Acquisition Device Submodule Housing 100 Linear Light Source Assembly
200 Light guide bar 210 Light emitting surface
220 Light Scattering Pattern 220A Mountain 220B Valley 250 Light Receiving End 300 Reflective Holder
310 Holder cavity part 320 Holder opening part 330 Holder post 350 Holder holding part 360 Holder end plate 400 FPC
410 conductive trace 420 FPC hole 430 flexible substrate 500 LED light source module
510 LED
520 Module housing 521 Module housing recess 530 LED conductor

Claims (20)

A light guide bar having a light emitting surface and a plurality of reflective surfaces, the light emitting surface having a light scattering pattern;
A flexible printed circuit (FPC) comprising a flexible plastic substrate and a plurality of conductive traces;
An LED light source module comprising at least one light emitting diode (LED) and attached to the FPC;
A reflective holder that partially covers the light guide bar and to which the FPC is attached;
Linear light source assembly.   The linear light source assembly according to claim 1, further comprising: a plurality of FPC holes provided in the FPC; and a plurality of holder posts provided in the reflection holder.   By inserting the plurality of holder posts into the plurality of FPC holes, the FPC is attached to the reflection holder, and the LED light source module is arranged in accordance with the position of the light receiving end of the light guide rod. The linear light source assembly according to claim 2.   The linear light source assembly of claim 1, wherein the LED light source module further comprises a plurality of LED conductors for electrically coupling the plurality of conductive traces and the at least one LED.   The linear light source assembly of claim 1, wherein the LED light source module comprises a surface mount device.   The linear light source assembly according to claim 1, wherein the LED light source module is attached to the FPC by surface mounting soldering.   The linear light source assembly according to claim 1, wherein the light scattering pattern has a plurality of valleys.   The linear light source assembly according to claim 7, wherein the plurality of valleys are formed on an outer surface of the light emitting surface.   The linear light source assembly according to claim 7, wherein an inclination angle of the plurality of valley portions on the light emitting surface gradually increases for each section.   The linear light source assembly according to claim 1, wherein the angle of the light scattering pattern gradually increases with a change in inclination angle of 0.03 to 0.15 degrees. A light guide bar having a light emitting surface and a plurality of reflective surfaces, the light emitting surface having a light scattering pattern;
An FPC comprising a flexible plastic substrate, a plurality of conductive traces and a plurality of FPC holes in the flexible plastic substrate;
An LED light source module comprising at least one LED and attached to the FPC;
A reflection holder partially covering the light guide rod and having a plurality of holder posts, wherein the FPC is mounted on the reflection holder by inserting the plurality of holder posts into the plurality of FPC holes. And the LED light source module is arranged in accordance with the position of the light receiving end of the light guide rod, and includes a reflection holder.
Linear light source assembly.   The linear light source assembly of claim 11, wherein the LED light source module further comprises a plurality of LED conductors for electrically coupling the plurality of conductive traces and the at least one LED.   The linear light source assembly of claim 11, wherein the LED light source module comprises a surface mount device.   The linear light source assembly according to claim 11, wherein the LED light source module is attached to the FPC by surface mounting soldering.   The linear light source assembly of claim 11, wherein the light scattering pattern has a plurality of valleys.   The linear light source assembly according to claim 15, wherein the plurality of valleys are formed on an outer surface of the light emitting surface.   The linear light source assembly according to claim 15, wherein an inclination angle of the plurality of valleys on the light emitting surface gradually increases for each section.   The linear light source assembly according to claim 11, wherein the angle of the light scattering pattern gradually increases as the tilt angle changes from 0.03 to 0.15 degrees. A light emitting surface and a plurality of reflective surfaces, the light emitting surface has a light scattering pattern, the light emitting surface has a light scattering pattern, and the light scattering pattern is a light guide rod having a plurality of valleys. The angle of inclination of the plurality of valleys of the light scattering pattern on the light emitting surface gradually increases from section to section,
An FPC comprising a flexible plastic substrate, a plurality of conductive traces and a plurality of FPC holes in the flexible plastic substrate;
The FPC further comprises at least one LED and a plurality of LED conductors for electrically coupling the plurality of conductive traces and the at least one LED, comprising a surface mount device, and surface mount soldering to the FPC. An LED light source module to be attached;
A reflection holder that partially covers the light guide rod and includes a plurality of holder posts, wherein the plurality of holder posts are inserted into the plurality of FPC holes, and the holder posts are welded by heat staking. The FPC is mounted on the reflection holder, and the LED light source module is disposed in accordance with the position of the light receiving end of the light guide bar.
Linear light source assembly.   The linear light source assembly according to claim 19, wherein the angle of the light scattering pattern gradually increases with a change in inclination angle of 0.03 to 0.15 degrees.