TWI533634B - Optical signal transmission device - Google Patents

Description

Optical signal transmission device

The invention provides an optical signal transmission device, in particular to an optical signal transmission device capable of adjusting a light divergence angle.

In order to provide convenient handling, electrical products are usually equipped with a remote control, which allows users to remotely adjust the channel or volume of the electrical products. In general, remote remote control uses optical communication technology as a means of transmitting control signals. The remote control and the electrical product respectively have a light emitting end and a light receiving end, and the optical signal output by the light emitting end covers a preset range in the space. If the light receiving end is within the preset range, the optical signal can be received to perform the corresponding Control program. However, the optical signal output by the light emitting end is within the preset range covered by it, and often causes interference noise due to environmental characteristics, so that the light receiving end cannot receive the correct control command. For example, the electrical product can be an LCD TV placed in a low cabinet, and the low cabinet is placed on a tile floor. If the height of the low cabinet is low, the coverage of the optical signal overlaps with the tile floor, and the optical signal output by the LCD TV will be reflected by the tile floor; at this time, the remote controller receives two optical signals, that is, one From the light emitting end of the electrical product, and the other from the reflective floor of the tile floor, the light receiving end of the remote control will be difficult to distinguish the difference between the two optical signals, resulting in a reading error.

The present invention provides an optical signal transmitting device capable of adjusting a light divergence angle to solve the above problems.

The patent application scope of the present invention discloses an optical signal transmitting device, which includes A carrier, a light source and a light transmissive sheet. The carrier has an accommodating space and an opening that communicates with the accommodating space. The light source is disposed in the accommodating space. The light source faces the opening to emit an optical signal. The light transmissive sheet covers the opening. The light transmissive sheet has a light converging unit. When the optical signal penetrates the light transmissive sheet, the light converging unit adjusts the light exiting angle of the light source such that the divergence angle of the optical signal along a first direction is substantially smaller than the divergence angle along a second direction. Wherein the first direction substantially intersects the second direction.

The optical convergence unit of the present invention further discloses that the optical convergence unit is a micro-aperture structure, the micro-aperture structure is disposed on two opposite surfaces of the transparent sheet; or the optical convergence unit is a slit structure, and the slit structure is The slit direction is substantially parallel to the second direction; or the light converging unit is a bite structure, a sandblasting structure or a light guiding structure; or the light converging unit is a plano-concave lens or a meniscus lens, and The recessed end of the light converging unit faces the light source.

The invention provides an optical convergence unit in the optical signal transmission device, and the optical convergence unit is located between the light source and the light transmissive sheet. The light signal emitted by the light source needs to be adjusted by the light convergence unit so that the light-emitting angle of the optical signal transmitting device in a specific direction is smaller than the light-emitting angle (diverging angle) of other non-specific directions. In this way, if the surrounding environment of the optical signal transmitting device is placed with a material such as a tile, a glass, a mirror, and the like, the optical signal transmitting device can change the divergence angle of the optical signal by using the optical convergence unit to avoid the divergence of the optical signal. Covering these items that reflect light, the noise interference caused by reflection can be avoided accordingly.

10‧‧‧Optical signal transmission device

12‧‧‧ Carrying parts

121‧‧‧ accommodating space

123‧‧‧ openings

14‧‧‧Light source

16‧‧‧Transparent film

161‧‧‧ first surface

163‧‧‧ second surface

18‧‧‧ concentrating parts

20‧‧‧Light Convergence Unit

201‧‧‧ recessed end

22‧‧‧Electrical products

24‧‧ ‧ low cabinet

A-A’, B-B’‧‧‧ extension line

V‧‧‧ first direction

H‧‧‧second direction

N1‧‧‧ slit direction

N2‧‧‧ cylinder direction

D‧‧‧ area

θ‧‧‧Lighting angle

θ _V , θ _H ‧‧‧ divergence angle

FIG. 1 is an exploded view of components of an optical signal transmitting apparatus according to an embodiment of the present invention.

Figure 2 is a side view of the optical signal transmission device of the embodiment of the present invention after being assembled.

FIG. 3 is a schematic diagram of the optical convergence unit changing the light angle according to the embodiment of the present invention.

FIG. 4 is a schematic diagram of an optical signal transmission device applied to an electrical product according to an embodiment of the present invention.

Fig. 5 is a schematic view showing an optical convergence unit of the first embodiment of the present invention.

Figure 6 is a schematic diagram of an optical convergence unit according to a second embodiment of the present invention.

Figure 7 is a schematic diagram of an optical convergence unit of a third embodiment of the present invention.

Figure 8 is a schematic diagram of an optical convergence unit according to a fourth embodiment of the present invention.

Referring to FIG. 1 and FIG. 2, FIG. 1 is an exploded view of components of an optical signal transmitting apparatus 10 according to an embodiment of the present invention, and FIG. 2 is a side view of the optical signal transmitting apparatus 10 according to an embodiment of the present invention. . The optical signal transmission device 10 includes a carrier 12, a light source 14, a light transmissive sheet 16, and a concentrating member 18. The carrier 12 is the main carrier structure of the optical signal transmitting device 10. The carrier 12 has an accommodating space 121 and an opening 123 , and the opening 123 communicates with the accommodating space 121 . The light source 14 is disposed in the accommodating space 121 toward the opening 123, so that the light signal emitted by the light source 14 can be spread out through the opening 123 (the optical signal propagates out of the carrier 12). Generally, the light source 14 is a light emitting diode.

The light-transmissive sheet 16 covers the opening 123 for closing the accommodating space 121 of the carrier 12 to prevent dust or foreign matter from falling into the interior of the carrier 12. The material of the light-transmissive sheet 16 is designed according to the optical signal characteristics of the light source 14. For example, when the light source 14 is an infrared light source, the light-transmitting sheet 16 may be composed of an infrared light-transmitting material. In addition, the concentrating member 18 is a selective accessory of the optical signal transmitting device 10. The concentrating member 18 may be disposed behind the light source 14, that is, the light source 14 is located between the light transmitting sheet 16 and the condensing member 18. Although most of the optical signals emitted by the light source 14 are emitted through the transparent sheet 16 to the outside of the carrier 12, a small portion of the optical signals may be reflected back to the accommodating space by being irradiated to the inner wall of the accommodating space 121. Therefore, the concentrating member 18 is disposed behind the light source 14 and can be used for receiving and reflecting the missing optical signals to improve the light-emitting efficiency of the optical signal transmitting device 10.

As shown in FIG. 2, the light-transmissive sheet 16 has a light converging unit 20, preferably formed on the inner surface of the light-transmitting sheet 16 adjacent to the accommodating space 121. When the optical signal passes through the transparent sheet 16, the light converges. The unit 20 can be used to adjust the light exit angle of the light source 14, thereby converging (or narrowing) the light exit angle of the light source 14. Please refer to FIG. 3 , which is a schematic diagram of the light convergence unit 20 changing the light exit angle θ of the light source 14 according to an embodiment of the present invention. As shown in FIG. 3, the A-A' extension line is a projection range formed by the optical signal passing through the light-transmitting sheet 16 when the light-converging sheet 16 is not provided with the light-converging unit 20; the B-B' extension line is a light-transmitting sheet. 16 has a projection range formed by the optical signal passing through the light-transmissive sheet 16 when the light converging unit 20 is provided. The light converging unit 20 can limit the light exit angle θ of the light source 14 by means of light shielding, light refraction or other means of changing optical properties to suppress reflection interference caused by the environment.

On the other hand, in order to ensure that the light converging unit 20 can effectively achieve the effect of adjusting the light exit angle θ of the light source 14, the area of the light converging unit 20 is designed corresponding to the light exit angle θ of the light source 14. In detail, the light source 14 needs to be optically designed first to solve the adjustment of the light source angle, the light intensity, the luminous flux size, the light intensity distribution, and the range and distribution of the color temperature. Then, the optical signal emitted by the light source 14 is subjected to secondary optical design, that is, the optical characteristic of the optical signal is modified by the optical convergence unit 20. For example, the present invention uses the light converging unit 20 to narrow the light exit angle θ of the light source 14. The area D of the light converging unit 20 is preferably at least larger than the projected area of the optical signal on the transparent sheet 16, so that the optical signal of the light source 14 must pass through the light converging unit 20 to pass through the transparent sheet 16. As shown in FIG. 3, the farther the distance of the light source 14 from the light-transmitting sheet 16 is, the larger the area D of the light converging unit 20 is, and the projection range of the light source 14 can be completely covered.

Please refer to FIG. 4, which is a schematic diagram of the optical signal transmission device 10 applied to the electrical product 22 according to an embodiment of the present invention. The electrical product 22 can be a television placed above the low cabinet 24, and the optical signal transmitting device 10 is the signal receiving/transmitting end of the electrical product 22. The low cabinet 24 is placed on a carrying surface (such as a floor, not shown). In this embodiment, the optical signal transmitting device 10 is disposed at the top end of the electrical product 22, however, the optical signal transmitting device 10 may also be disposed at the bottom, side, or inlaid in the display panel of the electrical product 22, depending on design requirements. . When the optical signal transmitting device 10 is activated, the light source 14 emits a light signal in a conical diffusion manner, and the optical signal will be along the first direction V (the vertical direction opposite to the bearing surface) and the second direction H (the opposite bearing surface is left and right) The horizontal direction) is outward. As shown in FIG. 4, when the optical signal travels along the first direction V, it may strike the bearing surface to cause reflective interference. Therefore, in the present invention, the optical convergence unit 20 is disposed at the light exit of the optical signal transmitting device 10, so that the light source 14 The divergence angle θ _V of the optical signal in the first direction V is substantially smaller than the divergence angle θ _H in the second direction H. In practical applications, the light converging unit 20 preferably limits the divergence angle θ _V to between sixty and ninety degrees, and the divergence angle θ _H can be relaxed between ninety and one hundred and fifty degrees. Not limited to this.

Please refer to FIG. 5 and FIG. 6. FIG. 5 is a schematic diagram of the optical convergence unit 20 according to the first embodiment of the present invention, and FIG. 6 is a schematic diagram of the optical convergence unit 20 according to the second embodiment of the present invention. As shown in FIG. 5, the light converging unit 20 is a micro-aperture structure through which the opposite surfaces of the light-transmitting sheet 16 are passed. As shown in Fig. 6, the light converging unit 20 is a slit structure, and the slit direction N1 of the slit structure can be substantially parallel to the second direction H (indicated in Fig. 4). At this time, the light-transmitting sheet 16 is usually composed of a non-transparent material, and the optical signal passes through the light-transmitting sheet 16 through the light converging unit 20 (micro-aperture structure or slit structure). In the first and second embodiments, the micro-aperture structure and the slit structure adjust the light-emitting angle (diverging angle θ _V ) of the light source 14 in the first direction V in a light-shielding manner, thereby avoiding environmental reflection interference.

Please refer to FIG. 7. FIG. 7 is a schematic diagram of the optical convergence unit 20 according to the third embodiment of the present invention. The light transmissive sheet 16 has a first surface 161 and a second surface 163 opposite to each other. The light converging unit 20 may alternatively be a bite structure, a sandblasting process structure or a light guiding structure formed on the first surface 161 adjacent to the light source 14. The purpose of the third embodiment is to form a rugged structural texture in a specific region of the light-transmitting sheet 16, and the depth of the structural texture is substantially less than 100 mm, thereby achieving an optimum light convergence effect. When the optical signal of the light source 14 passes through the transparent sheet 16, the surface pattern (structure texture) of the light converging unit 20 can change the light exit angle (diverging angle θ _V ) of the optical signal in the first direction V by means of refraction to prevent environmental reflection. Interference reduces the accuracy of interpretation of optical signals.

Please refer to FIG. 8. FIG. 8 is a schematic diagram of the optical convergence unit 20 according to the fourth embodiment of the present invention. The light converging unit 20 may be an optical lens such as a plano-concave lens or a meniscus lens, and the recessed end 201 of the light converging unit 20 faces the light source 14. The light converging unit 20 shown in FIG. 8 is a cylindrical mirror. When the light converging unit 20 is disposed on the transparent sheet 16, the cylinder direction N2 of the cylindrical mirror is parallel to the second direction H to converge the optical signal. The light exit angle (diverging angle θ _V ) in one direction V does not affect the light exit angle (diverging angle θ _H ) of the light signal in the second direction H. The light converging unit 20 of the fourth embodiment may further take the form of a spherical lens, and the spherical lens is also disposed on the light transmissive sheet 16 with its concave end facing the light source 14. The function of the spherical lens is as a cylindrical mirror, and the description thereof will not be repeated here. Both the cylindrical mirror and the spherical lens adjust the light exit angle of the light source 14 in the first direction V by means of refraction to suppress interference caused by environmental reflection.

In summary, the present invention provides an optical convergence unit in the optical signal transmission device, and the optical convergence unit is located between the light source and the light transmissive sheet. The light signal emitted by the light source needs to be adjusted by the light convergence unit so that the light-emitting angle of the optical signal transmitting device in a specific direction is smaller than the light-emitting angle (diverging angle) of other non-specific directions. In this way, if the surrounding environment of the optical signal transmitting device is placed with a material such as a tile, a glass, a mirror, and the like, the optical signal transmitting device can change the divergence angle of the optical signal by using the optical convergence unit to avoid the divergence of the optical signal. Covering these items that reflect light, the noise interference caused by reflection can be avoided accordingly.

10‧‧‧Optical signal transmission device

22‧‧‧Electrical products

24‧‧ ‧ low cabinet

V‧‧‧ first direction

H‧‧‧second direction

θ _V, θ _H ‧‧‧ divergence angle

Claims (15)

An optical signal transmission device includes: a carrier member having an accommodating space and an opening, the opening being connected to the accommodating space; a light source disposed in the accommodating space, the light source facing the Opening a light signal; and a light-transmissive sheet covering the opening, the light-transmitting sheet has a light converging unit, and the light converging unit adjusts a light-emitting angle of the light source when the light signal penetrates the light-transmitting sheet, The divergence angle of the optical signal along a first direction is substantially smaller than the divergence angle along a second direction, wherein the first direction substantially intersects the second direction. The optical signal transmitting device of claim 1, wherein an area of the light converging unit corresponds to an exit angle of the light source. The optical signal transmitting device of claim 1, wherein the optical signal passes through the optical convergence unit and the divergence angle of the first direction is substantially between sixty and ninety degrees, and along the second direction. The divergence angle is substantially between ninety and one hundred and fifty degrees. The optical signal transmission device of claim 1, wherein the optical convergence unit is a micro-aperture structure, and the micro-aperture structure penetrates opposite surfaces of the transparent sheet. The optical signal transmitting device of claim 1, wherein the light converging unit is a slit structure, and a slit direction of the slit structure is substantially parallel to the second direction. The optical signal transmitting device of claim 4 or 5, wherein the light converging unit adjusts the light exiting angle of the light source in the first direction in a light shielding manner. The optical signal transmitting device of claim 1, wherein the light converging unit is a biting structure, a sandblasting structure or a light guiding structure. The optical signal transmitting device of claim 7, wherein the light transmissive sheet has an opposite first surface and a second surface, the first surface is adjacent to the light source, and the light converging unit is formed on the first surface. The optical signal transmitting device of claim 7, wherein the structure of the light converging unit has a depth substantially less than 100 mm. The optical signal transmitting device of claim 1, wherein the light converging unit is a plano-concave lens or a meniscus lens, and the recessed end of the light converging unit faces the light source. The optical signal transmitting device of claim 10, wherein the optical convergence unit is a spherical lens or a cylindrical mirror. The optical signal transmitting device of claim 11, wherein the cylindrical body has a cylinder direction substantially parallel to the second direction. The optical signal transmitting device of claim 7 or 10, wherein the light converging unit is refracting to adjust an exit angle of the light source in the first direction. The optical signal transmission device of claim 1, further comprising: a concentrating member disposed between the transparent sheet and the concentrating member. The optical signal transmission device of claim 1, wherein the light source is an infrared light source, and the light transmissive sheet is composed of an infrared light transmissive material.