CN201369024Y - Light guide assembly - Google Patents

Abstract

A light guide assembly applied to an optical mouse comprises: a light guide cylinder comprising: the first lens part is used for converging light beams provided by the light source; a light emitting surface is arranged corresponding to the first lens part; two surface treatment layers arranged at two sides of the light emergent surface for filtering edge scattered light of the light beam; and at least one light refracting surface for refracting the light beam to the light emergent surface to make the light beam emergent from the light emergent surface to the surface for setting the optical mouse; and set up in the main part of this light guide cylinder one side, contain: a recessed portion; and a second lens part arranged corresponding to the recess part for focusing the light beam reflected by the surface to the image sensor in the recess part.

Description

Light guide components

technical field

The utility model relates to a light guide assembly, in particular to a light guide assembly applied to an optical mouse.

Background technique

The basic elements of the optical module in the optical mouse are to have a light source, an optical light guide structure and a sensor. The light beam emitted by the light source passes through the optical light guide structure in sequence, and finally guides the light beam to focus on the sensor. The quality of the focused beam on the sensor is the basis for judging the recognition of the positioning point. It can be seen from the optical path that the optical structure directly affects the behavior of the light beam, how to prevent the light beam from diverging, reduce the interference of stray light beams, and focus the high-brightness light beam on the sensor to achieve a high-sensitivity optical mouse. From the above, it can be seen that the design of the optical light guide structure plays a key role in influencing the light collection quality of the beam path.

Conventionally, FIG. 1 is a schematic diagram of a sensing module of an optical mouse. As shown in the figure, the sensing module 10 is disposed on the lower casing 50 of the optical mouse. The sensing module 10 is mainly composed of a light emitting diode 20 , a CMOS image sensing element 40 and a light guiding element 30 . The light emitting diode 20 is adapted to provide a light beam 22 , and the light beam 22 is sequentially reflected by the reflective surface 32 and the reflective surface 34 of the light guide component 30 and projected on a specific area of the desktop 60 where the optical mouse is placed. Then, the light beam 22 will be reflected by the desktop 60 onto a lens portion 36 of the light guide assembly 30, and the lens portion 36 will focus the light beam 22 onto the CMOS image sensing element 40, so that the CMOS image sensing element 40 can identify it. deal with.

In the above sensing module 10, the light beam 22 provided by the light emitting diode 20 needs to be reflected by the reflective surfaces 32, 34 to be projected onto the desktop 60, and the reflective surfaces 32, 34 cannot reflect the light beam 22 provided by the light emitting diode 20. Converging into ideal parallel light causes the light beam 22 to diverge more easily during transmission, resulting in low energy of the light beam 22 projected on the CMOS image sensing component 40 . In other words, the conventional sensing module 10 has poor focusing quality due to the divergence of light beams, and cannot have high brightness and high contrast, so the optical sensitivity is also impaired.

Utility model content

In order to solve the above problems, one of the purposes of this utility model is to provide a light guide component. By filtering the light beam emitted by the light guide component through the surface treatment layer, the scattered light at the edge of the light beam can be filtered out to reduce the focal plane of the light beam, so as to improve the light beam output from the light guide component. The light and dark contrast of the surrounding environment can enhance the recognition of the sensor and improve the positioning point sensitivity of the optical mouse.

In order to achieve the above purpose, a light guide assembly according to an embodiment of the present invention is applied to an optical mouse, including: a light guide cylinder, including: a first lens part for converging the light beam provided by the light source; a light exit surface, It is arranged corresponding to the first lens part; two surface treatment layers are arranged on both sides of the light exit surface to filter the edge scattered light of the light beam; and at least one light refraction surface is used to refract the light beam to the light exit surface so that the light beam passes through The light exit surface is emitted to the surface where the optical mouse is placed; and the main body is arranged on one side of the light guide cylinder, including: a concave portion; and a second lens portion is set corresponding to the concave portion, so as to focus the light beam reflected by the surface to the concave internal image sensor.

A light guide component of the present utility model filters out the light beam emitted by the light guide component through the surface treatment layer structure, which can filter out the scattered light at the edge of the light beam and reduce the focal plane of the light beam, so as to improve the light and dark contrast with the surrounding environment, thereby It can enhance the recognition of the sensor and improve the sensitivity of the positioning point of the optical mouse.

Description of drawings

FIG. 1 is a schematic structural diagram of a conventional light guide assembly.

FIG. 2A is a schematic structural diagram of a light guide assembly according to an embodiment of the present invention.

FIG. 2B is a schematic view from another angle of the surface treatment layer of the structure of the light guide assembly according to an embodiment of the present invention.

Explanation of main component symbols

10 sensing module

20 LEDs

22 beams

30 Light guide components

32, 34 reflective surface

36 Lens Department

40 CMOS image sensor components

50 lower shell

60 desktop

100 light guide cylinder

110 first lens part

120 first top surface

130 light exit surface

140 first bottom surface

150 light refraction surface

160 surface

170 surface treatment layer

200 subjects

210 depression

220 second top surface

230 second lens part

240 second bottom surface

Detailed ways

FIG. 2A is a schematic structural view of a light guide assembly according to an embodiment of the present invention; FIG. 2B is a schematic structural view of another angle of the surface treatment layer in the light guide assembly according to an embodiment of the present invention. Please refer to FIG. 2A and FIG. 2B , as shown in the figure, the light guide assembly is applied to an optical mouse to guide a light source (not shown) to a surface 160 on which the optical mouse is placed and reflectively focus on an optical mouse. An image sensor (not shown in the figure), wherein the light guide assembly includes a main body 200 and a light guide cylinder 100 .

Continuing the above, the light guide assembly of the present invention is characterized in that the light guide column 100 disposed on one side of the main body 200 includes: a first lens portion 110, a light exit surface 130, two surface treatment layers 170, and at least one light refraction Face 150. In one embodiment, as shown in FIG. 2A , the light guide column 100 is obliquely disposed on one side of the main body 200 . The first lens portion 110 is disposed on a first top surface 120 of the light guide column 100 . The light emitting surface 130 is disposed on a first bottom surface 140 of the light guide column 100 . The surface treatment layer 170 is disposed on both sides of the light emitting surface 130 . The light refraction surface 150 is used to refract a light beam (not shown) provided by the light source and converged by the first lens part 110, and then emerge from the light exit surface 130, wherein the light beam can only pass through the gap between the surface treatment layers 170 The light exit surface 130 is emitted to the surface 160, such as a desktop; in other words, when the light beam hits the structure of the surface treatment layer 170, the stray light beam at the edge is filtered due to the structure of the surface treatment layer 170, and finally the light beam is limited The light exits from the light exit surface 130 between the surface treatment layers 170, so that the edge scattered light interference of the outgoing light beam can be reduced, the focal plane of the light beam can be narrowed, and the light and dark contrast with the surrounding environment can be improved. In yet another embodiment, the number of light refracting surfaces 150 is four.

Continuing the above description, please continue to refer to FIG. 2A and FIG. 2B , the main body 200 includes a concave portion 210 and a second lens portion 230 . The concave portion 210 is disposed on a second top surface 220 of the main body 200 and the second lens portion 230 is disposed on a second bottom surface 240 of the main body 200 corresponding to the concave portion 210 . The second lens portion 230 is used to focus the light beam reflected by the surface 160 to an image sensor (not shown) in the concave portion 210 . The surface treatment layer 170 of the present invention prevents the beam from passing through, that is, filters out the interference of edge scattered light, enhances the contrast of the beam to focus on the image sensor, improves the recognition of the image sensor, and achieves a high-sensitivity optical mouse.

In one embodiment, the surface treatment layer 170 on the light guide cylinder 100 is disposed symmetrically on both sides of the light exit surface 130 to enhance the symmetry of the light beams guided between the light exit surfaces 130 . In yet another embodiment, the surface treatment layer 170 is an opaque surface, wherein the opaque surface can be a sprayed surface or a colored surface. Furthermore, the spray surface can be made by atomization treatment such as embossing, sandblasting, engraving, and electric discharge machining. In yet another embodiment, the surface of the light emitting surface 130 has an arc angle.

The above-described embodiments are only to illustrate the technical ideas and characteristics of the present utility model, and its purpose is to enable those skilled in this art to understand the content of the present utility model and implement it accordingly, and should not limit the scope of the present utility model with it. In the scope of the patent, all equivalent changes or modifications made according to the spirit disclosed in the utility model should still be covered in the patent scope of the utility model.

Claims (8)

1. A light guide assembly applied to an optical mouse, characterized in that it comprises: A light guide cylinder, including: a first lens part for converging a light beam provided by a light source; A light exit surface is set corresponding to the first lens part; Two surface treatment layers are arranged on both sides of the light exit surface to filter an edge scattered light of the light beam; and At least one light refraction surface is used to refract the light beam to the light exit surface, so that the light beam is emitted from the light exit surface to a surface on which the optical mouse is placed; and A main body is arranged on one side of the light guide cylinder, including: a depression; and A second lens part is arranged corresponding to the concave part, and is used for focusing the light beam reflected by the surface to an image sensor in the concave part. 2. The light guide assembly according to claim 1, wherein the light guide column is obliquely disposed on one side of the main body. 3. The light guide assembly as claimed in claim 1, wherein the surface treatment layer is an opaque surface. 4. The light guide assembly as claimed in claim 3, wherein the opaque surface is a spray surface. 5. The light guide assembly as claimed in claim 3, wherein the opaque surface is a colored surface. 6. The light guide assembly according to claim 1, wherein the surface treatment layer is symmetrically disposed on both sides of the light exiting surface. 7. The light guide assembly according to claim 1, wherein the number of the light refracting surfaces is four. 8. The light guide assembly as claimed in claim 1, wherein the surface of the light emitting surface has an arc angle.

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