CN100350365C - Light-guiding module with built-in light-emitting diodes - Google Patents

Abstract

The present invention relates to a light guide module with an embedded light emitting diode, which mainly embeds a light emitting diode die (LEDDie) into the light guide input end of a light guide unit. A parabola is formed inside the light guide unit so that the light emitted by the light emitting diode die can be consistently projected in the same direction through the parabola and then guided to the light guide output end.

Description

Light-guiding module with built-in light-emitting diodes

technical field

The invention relates to a light guide module for an optical mouse, in particular to a light guide module suitable for embedding light-emitting diodes.

Background technique

FIG. 1 is an assembly diagram showing the current optical mouse. The optical mouse uses a light emitting diode 4 as a light source, and uses an optical module 5 to project the light source to the desktop, and then the light is reflected from the desktop back to the image sensor inside the optical mouse. device7. However, the position of the light emitting diode 4 is located outside the optical module 5, and a light source receiving bracket 6 (Clip) is used to fix the light emitting diode 4 in a specific position, so that the light source emitted by the light emitting diode 4 can enter the optical module as much as possible. In mod 5. However, this method will increase the cost of mass production, and the light source is transmitted from the transparent protective body 41 of the light-emitting diode 4 to the air, and then to the optical module 5 through the air. Therefore, it needs to be indirectly transmitted twice to reach the desktop. Or the surface of the irradiated object makes the light loss on transmission reach 12%-15%. To make up for the lost light source, the brightness of the light emitting diode must be increased, which increases the current power consumption and reduces the life of the light emitting diode. Therefore, it is necessary to improve the design of the light guide module of the aforementioned known optical mouse.

Based on the spirit of active invention, the inventor desperately thought of a "light guide module with embedded light-emitting diodes" that could solve the above problems, and finally completed the invention after several researches and experiments.

Contents of the invention

The main purpose of the present invention is to provide a light guide module embedded with light emitting diodes, so as to increase the light guide efficiency, increase the effective light intensity, reduce current power consumption and increase the service life of the light emitting diodes.

Another object of the present invention is to provide a light guide module with built-in light emitting diodes, so as to simplify the optical light guide structure and remove the light source receiving bracket, so as to achieve easy assembly and reduce mass production cost.

In order to achieve the above purpose, the present invention provides a light guide module embedded with light-emitting diodes, which is characterized in that it mainly includes:

a light emitting diode die; and

A light guide unit has a light guide input end and a light guide output end, and there is an optical path between the light guide input end and the light guide output end, wherein the LED crystal grain is embedded in the light guide The light guide input end of the unit, the light source emitted by the light emitting diode crystal grain is guided to the light guide output end through the light path.

Wherein, the inside of the light guide input end is a curved surface, so that the light source emitted by the LED crystal grain and projected on the curved surface can be guided into the light path through the reflection of the curved surface.

Wherein, the curved surface is a paraboloid.

Wherein, the light-emitting diode grain is placed on the focus of the paraboloid.

Wherein, the paraboloid is coated or deposited with a reflective film.

Wherein, the reflective film has the property of opaque.

Because the present invention has a novel structure, can provide industrial utilization, and has indeed enhanced effects, it applies for an invention patent according to law.

Description of drawings

In order to further illustrate the technical content of the present invention, below in conjunction with embodiment and accompanying drawing describe in detail then, wherein:

Fig. 1 is a schematic diagram of assembly of a known optical mouse.

Fig. 2 is a schematic diagram of the architecture of the present invention.

FIG. 3 is a schematic diagram illustrating light rays reflected by a paraboloid.

Detailed ways

Regarding the preferred embodiment of the present invention, please refer to the schematic diagram of the structure shown in FIG. Wherein, the light guide module 2 has a light guide input end 21 and a light guide output end 22, an optical path 23 is formed between the light guide input end 21 and the light guide output end 22, so that the light guide input end 21 The input light source can be output to the light guide output end 22 through the guidance of the light path 23 , so that the light source can be smoothly projected onto the surface of the irradiated object.

The light emitting diode crystal grain 1 is embedded in the light guide input end 21 of the light guide module 2, and the light source emitted by the light emitting diode crystal grain 1 is guided to the light guide output end 22 through the light path 23, And because the light-emitting diode crystal grain 1 is directly embedded in the light guide module 2, the emitted light source is transmitted to the light guide output end 22 by a single medium (ie, the material of the light guide module 2) instead of As described in the prior art, the light guide output can only be reached through two indirect transmissions of different media, so the light loss caused by the light source passing through different media can be greatly reduced.

The inside of the pilot input end 21 of the aforementioned light guide module 2 is a curved surface 25, so as to reflect the light source emitted by the light-emitting diode crystal 1 and projected on the curved surface 25 to the light path 23 and guide it to the The light guide output end 22, wherein, the curved surface 25 is preferably a paraboloid 24, as shown in Figure 3, the paraboloid 24 has a focus position 242, and is embedded in the light guide input end 21 of the light guide module 2 The light-emitting diode crystal grain 1 is located at the focal position 242. According to the mathematical characteristics of the paraboloid, the side light (that is, the light that is not parallel to the light path 3) emitted by the light-emitting diode crystal grain 1 located at the focus of the paraboloid is projected onto the paraboloid 24 Afterwards, it will be reflected by the paraboloid 24 to be parallel to the light path 3, so that almost all the side light energy emitted by the LED crystal grain 1 can be guided to the pilot output end 22, and then projected onto the surface of the irradiated object, and is irradiated by the irradiated object. The surface of the object is reflected back to the image sensing unit 26 for image sensing processing, thereby further reducing light loss. In addition, a reflective film 241 with opaque properties can be coated or deposited on the curved surface 25 to completely avoid light loss caused by light transmission.

It can be seen from the above description that the present invention embeds the LED crystal grains directly in the light guide module, and designs the inside of the light guide module as a paraboloid, so that the light emitted by the LED crystal grains can follow the light path And reach the surface of the illuminated object, so as to increase the light guide efficiency, increase the effective light intensity, reduce the current power consumption and improve the service life of the LED, and simplify the optical light guide structure, and remove the light source storage bracket to achieve easy assembly and Reduce mass production costs.

To sum up, the present invention is different from the features of the known technology in terms of purpose, means and efficacy, and is actually an invention of great practical value, which should meet the patent requirements. However, it should be noted that the above-mentioned embodiments are examples only for convenience of description, and the scope of rights claimed by the present invention should be determined by the scope of the patent application, rather than being limited to the above-mentioned embodiments.

Claims (6)

1. A light guide module with embedded light-emitting diodes, characterized in that it mainly includes: a light emitting diode die; and A light guide unit has a light guide input end and a light guide output end, and there is an optical path between the light guide input end and the light guide output end, wherein the LED crystal grain is embedded in the light guide The light guide input end of the unit, the light source emitted by the light emitting diode crystal grain is guided to the light guide output end through the light path. 2. The light guide module with embedded light-emitting diodes according to claim 1, wherein the interior of the light guide input end is a curved surface, so that light emitted by the light-emitting diode crystal grains is projected on the curved surface The light source can be introduced into the light path through the reflection of the curved surface. 3. The light guide module embedded with LEDs according to claim 2, wherein the curved surface is a paraboloid. 4 . The light guide module with embedded light emitting diodes as claimed in claim 3 , wherein the light emitting diode crystal grains are placed at the focus of the paraboloid. 5 . The light guide module with built-in LEDs according to claim 3 , wherein, the paraboloid is coated or deposited with a reflective film. 6 . 6 . The light guide module with built-in light emitting diodes according to claim 5 , wherein the reflective film has an opaque property. 7 .

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