KR101414049B1 - Package structure for eliminating impact of ambient light for optical sensors - Google Patents

Abstract

According to an embodiment of the present invention, an optical waveguide (100) which induces light emitted from a compensation device (13) to a light receiving device (12) in an optical sensor structure including a light emitting device, the light receiving device (12), and the compensation device (13) emitting a light to the light receiving device (12) to compensate for an operation signal of the light receiving device (12), includes: sidewalls (19) enclosing the light receiving device (12) and the compensation device (13) and blocking a light emitted towards the side surfaces of the compensation device (13); a top portion member (20) positioned on a top portion of the compensation device (13), attached to a top end of the sidewalls (19), and reflecting a light emitted upward from the compensation device (13) into a downward direction; and a transmissive resin layer (21) coated inner surface of the top portion member (20), wherein light emitted upward from the compensation device (13) is incident on the transmissive resin layer (21) coated on the inner surface of the top portion member 20, is repeated such that the light incident on the transmissive resin layer (21) is reflected on a reflection surface (23) of the inner surface of the top portion member (20) and is totally reflected on a boundary surface (24) of the transmissive resin layer (21), and the light is then guided to the light receiving device (12) through a light output surface (22). According to the waveguide of the present invention, since a compensation light emitted from the compensation device to the light receiving unit can be transferred without leaks towards the outside, an operation of the operation detecting sensor can be precisely controlled.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a package structure for eliminating disturbance light from an optical sensor,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical waveguide, and more particularly, to an optical waveguide capable of eliminating the influence of disturbance light on an optical sensor that controls a mobile device, a vehicle device, a home appliance, and the like in a noncontact manner.

BACKGROUND ART [0002] With the development of electronic communication technology, mobile devices such as a mobile phone terminal, a PDA, and a Tablet PC have become a necessity in everyday life or duties. In addition to the basic phone call function, And a variety of additional functions such as a storage function, an information search function, a voice recording and playback function, and a video shooting and reproduction function. The various functions of the mobile device can be selected and controlled through a key button or a screen touch.

However, when there is an inconvenience in operating the mobile device by directly touching the key button or the screen of the mobile device, there is a problem that the operation of the mobile device is limited.

In order to solve such a problem, a motion detection sensor technology has been developed which can control the operation of the mobile device by sensing the operation of the user's mobile device without directly touching the key button or screen of the mobile device.

In the case of such motion detection sensors, a receiver is disposed in a transmissive or reflective form using a light source of infrared or visible light as a light emitting element so that light emitted from the light emitting element 1 is reflected by a reflector (for example, And the reflected light 4 is recognized by the receiver 2. A receiver, which is a light-receiving element, generally uses a photodiode, a phototransistor, or the like. When a receiver senses light, a current is generated. A current generated in the receiver is transmitted as an operation signal to a controller, And controls the operation. In this case, when the light emitted from the light emitting element is directly transmitted to the receiver (light receiving element), the function of the motion detecting sensor is deteriorated. Therefore, in order to prevent the light from being directly transmitted from the light emitting element to the light receiving element, Shielding wall 8 is provided between the light-emitting element 1 and the light-receiving element 2 in order to remove an unnecessary signal 4 'directly transmitted from the light-emitting element 2 to the light- A structure in which the light-receiving element 1 and the light-receiving element 2 are provided in the shielding chambers 5 and 6, respectively (see Fig. 3).

However, even if the light is directly transmitted from the light emitting element to the light receiving element as described above, the light receiving element reacts to light in all wavelength regions. Therefore, if there are other light sources in the surrounding environment, . ≪ / RTI > Due to such a problem, it is difficult to apply a non-contact type motion detection sensor in a bright place with an external light source.

Accordingly, in order to reduce the influence of the external light source on the motion detection sensor, a method of sending a light to a light source emitting light or filtering the light using a wavelength of a certain region has been used. However, even in this method, if the external light source becomes too strong, the function of the motion detection sensor deteriorates.

In order to solve the above problems, there has been developed a technique of using a compensation element for removing the influence of disturbance light and irradiating light for compensation to the light receiving element. 4, the compensation element 3 is disposed on the side surface of the light-receiving element 2 and irradiates light to the light-receiving element 2. The compensation element 3 emits light from the light-emitting element 1 and is reflected by the reflector 9 And corrects the operation signal generated in the light receiving element 2 by light. The compensation element 3 emits light (compensation signal 10) so that the light receiving element 2 senses a certain amount of light according to the brightness of the ambient environment sensed by a separately mounted sensor (not shown). In other words, a change in the surrounding environment such as outdoor weather, tunnel, and intensity of indoor illumination is reflected on the reflector 9 to affect the intensity of the light reaching the light receiving element 2 to accurately detect the light receiving element 2 The compensation element 3 is controlled by a control unit (not shown) so that the light receiving element 2 can accurately sense the intensity of light that is reflected by the reflector 9 and reaches the light receiving element 2, The light receiving element 2 is irradiated with the compensation light according to the amount of the external light.

As described above, even when the compensating element corrects the operation signal of the light-receiving element 2 by irradiating the light-receiving element with the compensation light in order to eliminate the influence of the disturbance light, the compensating light The light 10 'flowing out to the outside becomes an unnecessary signal. When the unnecessary signal 10 'flows out to the outside or the emitted light is radiated to the other reflector and returns to the light receiving element 2, it becomes difficult to control the operation signal of the light receiving element 2 accurately. Particularly, since the light receiving element 2 must receive the light reflected by the reflector 9, the upper part of the light receiving element 2 must be formed in a structure that allows light to pass therethrough. 2, a part of the light irradiated from the compensating element 3 toward the light receiving element 2 can flow out to the upper part of the light receiving element 2. [

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide an optical sensor structure including a compensation element for emitting light to a light receiving element for correcting operation signals of a light emitting element, An object of the present invention is to provide an optical waveguide which guides light emitted from an element to a light receiving element, and which can radiate light emitted from a compensating element toward a light receiving element without flowing out to the outside.

An optical waveguide according to an embodiment of the present invention includes a compensation element for emitting light to a light receiving element for correcting operation signals of a light emitting element, a light receiving element, and a light receiving element, To the light receiving element, the optical waveguide comprising: a sidewall surrounding the compensation element and the light reception element, the sidewall shielding light emitted to the side of the compensation element; An upper member positioned on the upper side of the compensation element and attached to an upper end of the side wall to reflect light emitted upward from the compensation element in a downward direction; And a translucent resin layer applied to an inner surface of the upper member, wherein light emitted in an upward direction from the compensator is incident on a translucent resin layer coated on an inner surface of the upper member, and is incident on the translucent resin layer The light reflected from the reflection surface of the inner surface of the upper member is totally reflected at the interface of the transparent resin layer, and is guided to the light receiving element through the light exit surface.

In the optical waveguide according to an embodiment of the present invention, the light transmitting resin layer may be made of silicon.

In the optical waveguide according to an exemplary embodiment of the present invention, the refractive index of silicon may be about 1.41 and the critical angle may be about 45.17 degrees.

In the optical waveguide according to an embodiment of the present invention, the reflection surface of the inner surface of the upper member may be a combination of the regular reflection surface and the irregular reflection surface.

In an optical waveguide according to an embodiment of the present invention, the side wall may be integrally formed with a base portion on which a compensation element and a light receiving element are mounted.

In the optical waveguide according to an embodiment of the present invention, the upper member may be integrally formed with the side wall.

The optical waveguide according to an embodiment of the present invention may further include a shielding wall provided between the compensation element and the light receiving element.

According to another aspect of the present invention, there is provided an optical sensor structure including a light emitting element, a light receiving element, and a compensation element for emitting light to the light receiving element for correcting operation signals of the light receiving element, To the light receiving element, the optical waveguide comprising: a sidewall surrounding the compensation element and the light reception element, the sidewall shielding light emitted to the side of the compensation element; And an upper member disposed on the upper side of the compensating element and attached to an upper end of the side wall to reflect light emitted upward in the upward direction from the compensating element in a downward direction, The light diffused upward from the compensation element is reflected by the reflection surface of the inner surface of the upper member and guided to the light receiving element.

The optical waveguide according to another embodiment of the present invention may further include a shielding wall provided between the compensation element and the light receiving element.

According to another aspect of the present invention, there is provided an optical waveguide provided on a display unit of a portable terminal, the optical waveguide including a compensation element for emitting light to a light receiving element to correct operation signals of the light emitting element, the light receiving element, An optical waveguide for guiding light emitted from a compensation element to a light receiving element in an optical sensor structure for controlling operation of the portable terminal, the optical waveguide comprising: a base portion mounted on an upper portion of a display portion of the portable terminal; A side wall surrounding the compensating element and the light receiving element mounted on the base and shielding light emitted to the side of the compensating element; An upper member positioned on the upper side of the compensation element and attached to an upper end of the side wall to reflect light emitted upward from the compensation element in a downward direction; And a translucent resin layer applied to an inner surface of the upper member, wherein light emitted in an upward direction from the compensator is incident on a translucent resin layer coated on an inner surface of the upper member, and is incident on the translucent resin layer The light reflected from the reflection surface of the inner surface of the upper member is totally reflected at the interface of the transparent resin layer, and is guided to the light receiving element through the light exit surface.

According to another aspect of the present invention, there is provided an optical waveguide provided on a display unit of a portable terminal, the optical waveguide including a compensation element for emitting light to a light receiving element to correct operation signals of the light emitting element, the light receiving element, An optical waveguide for guiding light emitted from a compensation element to a light receiving element in an optical sensor structure for controlling operation of the portable terminal, the optical waveguide comprising: a base portion mounted on an upper portion of a display portion of the portable terminal; A side wall surrounding the compensating element and the light receiving element mounted on the base and shielding light emitted to the side of the compensating element; And an upper member disposed on the upper side of the compensating element and attached to an upper end of the side wall to reflect light emitted upward in the upward direction from the compensating element in a downward direction, The light diffused upward from the compensation element is reflected by the reflection surface of the inner surface of the upper member and guided to the light receiving element.

According to another aspect of the present invention, there is provided an optical sensor structure including a light emitting element, a light receiving element, and a compensation element for emitting light to the light receiving element for correcting operation signals of the light receiving element, A first optical waveguide part in which a compensation element is disposed and in which a first transparent resin layer is applied to an upper surface and a side surface of the compensation element; A second optical waveguide part in which a second light transmitting resin layer is applied to an upper surface and a side surface of the light receiving element; A shielding wall disposed above the first optical waveguide part and the second optical waveguide part and having a light path formed thereon for communicating the first optical waveguide part and the second optical waveguide part, Light is incident through the light path above the shielding wall and totally reflected by the second translucent resin layer and guided to the light receiving element.

According to another aspect of the present invention, there is provided an optical waveguide comprising: a compensation element provided on a display unit of a portable terminal and emitting a light to a light receiving element to correct operation signals of the light emitting element, the light receiving element, An optical waveguide for guiding light emitted from a compensation element to a light receiving element in an optical sensor structure for controlling operation of the portable terminal, the optical waveguide comprising: a base portion mounted on an upper portion of a display portion of the portable terminal; A first optical waveguide part to which a first transmissive resin layer is applied on an upper surface and a side surface of the compensating element; A second optical waveguide part in which a second light transmitting resin layer is applied to an upper surface and a side surface of the light receiving element; A shielding wall disposed above the first optical waveguide part and the second optical waveguide part and having a light path formed thereon for communicating the first optical waveguide part and the second optical waveguide part, Light can be incident through the light path above the shielding wall and totally reflected by the second translucent resin layer to be guided to the light receiving element.

Using the optical waveguide according to the present invention, the compensation light emitted from the compensation element to the light receiving element can be transmitted without being leaked to the outside, so that an effect of more accurately controlling the operation of the motion detection sensor can be obtained .

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view showing a light sensor structure including a light emitting element and a light receiving element in the prior art; FIG.
2 is a view showing an optical sensor structure including a light emitting element and a light receiving element in the prior art and having a shielding wall between the light emitting element and the light receiving element.
3 is a view showing an optical sensor structure including a light emitting element and a light receiving element in the prior art, in which a light emitting element and a light receiving element are provided in a shielded room, respectively.
4 is a view showing a light sensor structure including a light emitting element, a light receiving element, and a compensation element for emitting light to a light receiving element for correcting operation signals of the light receiving element in the prior art.
Fig. 5 is a diagram showing light induction characteristics between the dense medium n1 and the noble medium n2.
6 is a view illustrating a light guiding path in an optical waveguide according to an embodiment of the present invention.
7 is a view illustrating a light induction path in an optical waveguide according to another embodiment of the present invention.
8 is a view showing a light guiding path in an optical waveguide according to another embodiment of the present invention.
9 is a view showing a light guiding path in an optical waveguide according to another embodiment of the present invention.
10 is a view showing the relationship between the critical angle and the refractive index.

BRIEF DESCRIPTION OF THE DRAWINGS The above objects, features and advantages will become more apparent through the following examples in conjunction with the accompanying drawings.

It is to be understood that the specific structure or functional description is illustrative only for the purpose of describing an embodiment according to the concept of the present invention and that the embodiments according to the concept of the present invention may be embodied in various forms, Should not be construed as limited to these.

The embodiments according to the concept of the present invention can make various changes and have various forms, so that specific embodiments are illustrated in the drawings and described in detail in the specification of the present application. However, it should be understood that the embodiments according to the concept of the present invention are not intended to limit the present invention to specific modes of operation, but include all changes, equivalents and alternatives included in the spirit and scope of the present invention.

The terms first and / or second etc. may be used to describe various components, but the components are not limited to these terms. The terms may be named for the purpose of distinguishing one element from another, for example, without departing from the scope of the right according to the concept of the present invention, the first element being referred to as the second element, The second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when it is mentioned that an element is "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Other expressions for describing the relationship between components, such as "between" and "between" or "adjacent to" and "directly adjacent to" should also be interpreted.

The terminology used in the specification of the present application is used only to describe a specific embodiment and is not intended to limit the present invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. It is to be understood that the terms such as " comprises "or" having "in this specification are intended to specify the presence of stated features, integers, But do not preclude the presence or addition of steps, operations, elements, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning in the context of the relevant art, and unless otherwise expressly defined in the specification of the present application, It is not interpreted.

Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

Fig. 5 is a diagram showing the light-induced characteristic between the dense medium n1 and the noble medium n2; 6 is a view illustrating a light guiding path in an optical waveguide according to an embodiment of the present invention.

5 and 6, an optical sensor structure including a light emitting device, a light receiving device, and a compensation device to which an optical waveguide according to an embodiment of the present invention can be applied will be described.

As the light emitting element, for example, an infrared ray diode can be used, and parallel light is preferably used. A receiver, which is a light-receiving element, generally uses a photodiode, a phototransistor, or the like. When a receiver senses light, a current is generated. A current generated in the receiver is transmitted as an operation signal to a controller, And controls the operation.

The optical sensor structure for non-contact controlling the operation of a mobile device such as a mobile phone, a PDA, and a Tablet PC includes at least one light emitting element 11 and one light receiving element 12, The compensating element 13 for emitting the compensating light to the light receiving element 12 may be disposed adjacent to the light receiving element 12 in order to correct the signal.

The light is continuously emitted from the light emitting element 11 of the optical sensor structure mounted on the mobile device and the light is reflected by the user's body or the like The light receiving element 12 generates a current, and the current generated in the light receiving element 12 becomes an operation signal and is transmitted to a control unit (not shown). Here, the light emitted from the light emitting element 11 may be, for example, infrared light of 870 nm, and the light receiving element 12 may be a photodiode, a phototransistor, or the like.

When other light sources exist in the surrounding environment, the output of the light receiving element 12 is influenced. Therefore, in order to eliminate the influence of the disturbance light, a compensation element 13 for irradiating light for compensation to the light receiving element 12 is used And is disposed on the side surface of the light receiving element 12. [ The compensation element 13 emits light so that the light receiving element 12 senses a certain amount of light according to the brightness of the ambient environment sensed by a separately mounted sensor (not shown). That is, light emitted to the light emitting element 11 is reflected by a reflector (not shown) and reaches the light receiving element 2, regardless of changes in the surrounding environment such as outdoor weather, tunnel, The compensation element 13 irradiates the light receiving element 12 with the compensation light according to the amount of the external light under the control of the control unit (not shown).

The optical waveguide 100 is provided between the compensation element 13 and the light receiving element 12 so that the compensation light emitted from the compensation element 13 can be guided to the light receiving element 12 without flowing out to the outside / RTI >

An optical waveguide 100 according to an embodiment of the present invention includes a light emitting element, a light receiving element 12, and an optical sensor 12 including a compensation element 13 for emitting light to a light receiving element for correcting operation signals of the light receiving element. And an optical waveguide 100 for guiding the light emitted from the compensation element 13 to the light receiving element 12 in the structure. A side wall (19) surrounding the compensation element (12) and the light receiving element (13) and shielding light emitted to the side of the compensation element (12); An upper member 20 positioned on the upper side of the compensation element 13 and attached to an upper end of the side wall 19 to reflect light emitted upward from the compensation element 13 in a downward direction; And a translucent resin layer (21) applied to the inner surface of the upper member (20). Light emitted upward from the compensating element 13 is incident on the translucent resin layer 21 coated on the inner surface of the upper member 20 and light incident on the translucent resin layer is incident on the upper member 20 And is then totally reflected on the interface 24 of the transparent resin layer 21 and then guided to the light receiving element 12 through the light exit surface 22 .

When the translucent resin layer 21 is applied to the inner surface of the upper member 20 as described above, since the outside of the translucent resin layer is an air layer which is a less medium than the translucent resin layer, When the incident angle of the light reflected by the reflective surface 23 of the inner surface of the upper member 20 and directed to the interface 24 of the translucent resin layer is greater than the critical angle c of the resin layer, It is reflected to the inside without being leaked to the outside by total internal reflection (TIR). That is, as shown in FIG. 5, when the light advances from the medium (n1) having a high refractive index to the medium (n2) having a low refractive index, light is not moved from the first medium to the second medium when the light is incident at a certain angle or more The total internal reflection (TRI) phenomenon occurs, which is returned to the first medium, and the incidence angle of the light at which total internal reflection starts to occur is referred to as a critical angle (θc).

The relationship between the critical angle c and the refractive index is given by the following equation.

θc = arcsin (n2 / n1)

Here, n1 is the refraction index of the dense medium, and n2 is the refraction index of the refraction medium.

As can be seen from Fig. 10, in the relationship between the critical angle? C and the refractive index, the critical angle? C becomes smaller as the refractive index n1 of the dense medium becomes larger. Therefore, as the refractive index of the dense medium increases, the critical angle c decreases, and the light emitted from the compensating element to the dense medium becomes more refracted within the dense medium. Therefore, as the material of high refractive index is used, The transmission efficiency can be increased.

The translucent resin layer 21 applied to the present invention may be formed of a silicon layer. The silicon layer has a refractive index of about 1.41 and a critical angle of about 45.17. Further, epoxy may be used for the light-transmitting resin layer 21, and other transparent resin may be used.

In the present invention, if the intensity of the light directly irradiated from the compensation element 13 to the light receiving element 12 is too strong, the compensation element 13 for correcting the operation signal of the light receiving element 12 The upper end portion is opened between the compensating element 13 and the light receiving element 12 so that the light is not directly irradiated from the compensating element 13 to the light receiving element 12, A shielding wall 14 having a predetermined height can be provided.

In the optical waveguide according to an embodiment of the present invention, the shielding wall 14 is located away from the compensating element 13 by the width of the compensating element, and the height h4 of the shielding wall 14 is less than the height Can be set to about 1.5 times the height (h3) of the element (13). When the height of the shielding wall 14 is set as described above, light having an incident angle of about 47 to 55 out of the light emitted from the compensating element 13 can be guided to the light receiving element 12. [

The reflection surface 23 of the inner surface of the upper member 20 in the optical waveguide 100 according to the embodiment of the present invention is formed of a combination of the regular reflection surface and the irregular reflection surface and is emitted from the compensation element 13, Can be designed to adjust the amount of light that is guided to the light source (12).

In the optical waveguide 100 according to the embodiment of the present invention, the side wall 19 may be formed integrally with the base portion 17 on which the compensation element and the light receiving element are mounted. In this case, an upper member 20 coated with a light-transmitting resin layer 21 on the inner side is attached to the upper portion of the side wall 19 formed integrally with the base portion 17. The attachment of the upper member 20 and the side wall 19 is performed using a known method such as adhesion by an adhesive agent, so that detailed description thereof will be omitted.

In the optical waveguide 100 according to an embodiment of the present invention, the upper member 20 and the side wall 19 may be integrally formed. In this case, a side wall 19 integrated with the upper member 20 to which the translucent resin layer 21 is applied is attached to the base portion 17 on the inner side. Attachment of the side wall 19 and the base portion 18 is performed by a known method such as adhesion by an adhesive agent, so a detailed description thereof will be omitted.

Next, the operation of the optical waveguide 100 according to an embodiment of the present invention will be described.

In the optical waveguide 100 according to the embodiment of the present invention, since the translucent resin layer 21 is applied to the inner surface of the upper member 20, the outer portion of the translucent resin layer 21 is an air layer, The incident angle of the light that is diverged from the element 13 and is incident on the translucent resin layer 21 and then reflected by the reflection surface 23 of the inner side surface of the upper member 20 and directed to the interface 24 of the translucent resin layer, Is larger than the critical angle (? C) of the stratum, it is reflected to the inside without flowing out to the outside due to total internal reflection (TIR). The light incident on the translucent resin layer 21 is reflected by the reflective surface 23 on the inner side of the upper member 20 and then is totally reflected on the boundary surface 24 of the translucent resin layer 20, The light exit surface 22 is evacuated. 6, since the light exit surface 22 is inclined inward, the light reflected by the reflection surface 23 of the inner surface of the upper member 20 and directed toward the light exit surface 22 is almost The incident angle is much smaller than the critical angle c of the resin layer so that it passes through the inclined interface 22 of the resin layer as it is without causing total internal reflection and is directed to the light receiving element 12. [ Accordingly, it is possible to prevent a phenomenon that a part of the light emitted from the compensation element 13 is reflected by an external object and is incident on the light receiving element 12.

6, a method of manufacturing an optical waveguide according to an embodiment of the present invention will be described.

The light receiving element 12 and the compensation element 13 are mounted on the base 17 and the side wall 19 surrounding the compensation element 13 and the light receiving element 12 mounted on the base 17 are mounted . The technique of mounting the light receiving element 12 and the compensation element 13 on the base 17 and the technique of mounting the side wall 19 on the base 17 can be well known in the art, do. The side wall 19 may be integrally formed with the base 17. The height hw of the side wall 19 surrounding the light receiving element 12 and the compensating element 13 on the upper surface of the base 17 is about 1.5 to 2.5 times the height h3 of the compensating element 13. [ Times. When the height of the side wall 19 is set as described above, light having an incident angle of about 47 ° to 55 ° among the light emitted from the compensation element 13 can be guided to the light receiving element 12. Next, the translucent resin layer 21 is applied to the inner surface of the upper member 20, which is located on the upper side of the compensation element 13 and attached to the upper end of the side wall 19. [ The thickness t of the translucent resin layer 21 may be set to about 0.5 to 2 times the height h3 of the compensating element 13. [ When the thickness of the light-transmitting resin layer 21 is set as described above, light having an incident angle of about 47 to 55 degrees out of the light emitted from the compensation element 13 can be guided to the light-receiving element 12. [

 The inner surface of the upper member 20 is basically formed as a front slope surface, but may be formed by a combination of a regular reflection surface and a diffusely reflecting surface before applying the translucent resin layer 21.

Then, the upper member 20, to which the translucent resin layer 21 is applied to the inner surface, is attached to the upper end of the side wall 19 at the upper portion of the compensation element 13. A known technique can be used for attaching the upper member 20 to the side wall 19, and a description thereof will be omitted.

Although the upper member 20 is attached to the side wall 19, the present invention is not limited thereto. The upper member 20 may be integrally formed with the side wall 19 have. In this case, the light receiving element 12 and the compensation element 13 are mounted on the base 17, and then the integrally formed upper member 20 and the side wall 19 are attached to the base 17.

By using the optical waveguide according to the present invention, it is possible to dramatically reduce the influence of disturbance light of a conventional optical sensor, and it is possible to design an optical sensor that can operate up to 200,000 lux theoretically. The sensor structure can be miniaturized.

Meanwhile, the optical waveguide according to another embodiment of the present invention can be applied to mobile devices such as a smart phone, a mobile phone terminal such as a touch phone, a PDA, and a Tablet PC.

Referring to FIG. 7, an optical waveguide 200 according to another embodiment of the present invention is shown. 7 includes a light emitting element, a light receiving element 12 and a compensating element 13 for emitting light to the light receiving element for correcting an operation signal of the light receiving element. In the optical sensor structure, And an optical waveguide for guiding the light emitted from the light receiving element 12 to the light receiving element 12. A side wall (19) surrounding the compensation element (13) and the light reception element (12) and shielding light emitted to the side of the compensation element; And an upper member 20 disposed on the upper side of the compensation element 13 and attached to the upper end of the side wall 19 to reflect light upward in the upward direction from the compensation element. The reflective surface 23 of the inner surface of the upper member 20 is formed by a combination of a regular reflective surface and a diffusive reflective surface so that light emitted upward from the compensating element 13 is reflected by the inner surface of the upper member 20 And can be reflected by the reflecting surface and guided to the light receiving element 12. [ The optical waveguide 200 according to another embodiment of the present invention may be configured such that the reflection surface 23 inside the upper member 20 is formed of a combination of the regular reflection surface and the irregular reflection surface, It is possible to simplify the manufacturing process and reduce the development cost. In addition, when the upper member 20 and the side wall 19 are integrally formed, it is advantageous for thinning and miniaturization.

According to another embodiment of the present invention, a light emitting element 11, a light receiving element 12, and a light receiving element are provided on a display unit (not shown) The optical waveguide includes a compensation element (13) for guiding light emitted from a compensation element in an optical sensor structure for controlling the operation of the portable terminal. The optical waveguide includes a base (17); A side wall (19) surrounding the compensation element (13) and the light receiving element (12) mounted on the base portion and shielding light emitted to the side of the compensation element; An upper member 20 positioned on the upper side of the compensation element 13 and attached to an upper end of the side wall to reflect light emitted upward from the compensation element in a downward direction; And a translucent resin layer (21) applied to the inner surface of the upper member, wherein light emitted in an upward direction from the compensating element (13) is applied to a translucent resin layer The light incident on the translucent resin layer 21 is reflected by the reflection surface 23 of the inner surface of the upper member 20 and then reflected on the boundary surface 24 of the translucent resin layer 21 The total reflection operation can be repeated to be guided to the light receiving element 12 through the light exit surface 22.

The basic structure, action and manufacturing method of the optical waveguide according to another embodiment of the present invention are similar to those of the optical waveguide 100 according to the embodiment of the present invention described above, The description is omitted.

Referring to FIG. 8, an optical waveguide 300 according to another embodiment of the present invention is shown. 8 includes a light emitting element, a light receiving element 12 and a compensation element 13 that emits light to the light receiving element for correcting an operation signal of the light receiving element. In the optical sensor structure, And an optical waveguide 300 for guiding the light emitted from the light receiving element 12 to the light receiving element 12. The optical waveguide 300 includes a first optical waveguide portion A and a second optical waveguide portion B and is disposed between the first optical waveguide portion A and the second optical waveguide portion B And a shielding wall 14 formed on top of the optical path for communicating the first and second optical waveguide portions A and B with each other. A compensation element 13 is disposed in the first optical waveguide portion A and a first transparent resin layer 15 is coated on the upper surface and side surfaces of the compensation element. A light receiving element 12 is disposed on the second optical waveguide portion B and a second light transmitting resin layer 15 'is coated on the upper surface and the side surface of the light receiving element.

When the first optical waveguide portion A and the second optical waveguide portion B are coated with the light transmitting resin layer as described above, since the upper portion of the light transmitting resin layer is an air layer which is a less medium than the light transmitting resin layer, When the angle of incidence of the light emitted from the light emitting device toward the resin layer is larger than the critical angle? C of the resin layer, the light is reflected to the inside without being leaked to the outside due to total internal reflection.

In the optical waveguide 300 according to another embodiment of the present invention shown in FIG. 8, the shielding wall 14 is located apart from the compensation element 13 by a width of the compensation element, and the first transparent resin layer A (H3 + t3) of the shielding wall 14 and the height h2 + t2 of the second transparent resin layer B are about twice the height h3 of the compensating element and the height h4 of the shielding wall 14 is Can be set to about 1.5 times the height (h3) of the compensating element (13). When the dimensions of the shielding wall 14, the first translucent resin layer A and the second translucent resin layer B are set as described above, the light emitted from the compensation element 13 has an incident angle of about 47 to 55 degrees The light can be guided to the light receiving element 12. The light emitted from the compensating element 13 in the first translucent resin layer 15 at a smaller angle than the critical angle? C flows out through the first translucent resin layer 15, An opaque layer may be provided on the upper surface of the first transparent resin layer 15 in order to prevent light incident at an angle of less than the critical angle θc from flowing out to the outside of the first transparent resin layer 15. For example, The upper surface of the first transparent resin layer 15 may be coated with an opaque material or the opaque cover may be provided on the upper surface of the first transparent resin layer 15. In the optical waveguide 400 as shown in FIG. The upper member 20 may be attached to the upper end of the first transparent resin layer 19 so as to block light passing through the interface of the first transparent resin layer 15 at an angle less than the critical angle? C.

In recent years, optical sensor structures that can control the operation of a vehicle device in a non-contact manner have been widely applied to automotive devices such as vehicle instrument devices, navigation devices, air conditioner control devices, audio and video reproducing devices, A photo sensor structure capable of controlling the operation in a non-contact manner has been widely applied to home appliances in residential or office buildings, air conditioner control devices, security devices, and the like. Therefore, the optical waveguide for guiding the light emitted from the compensation element in the optical sensor structure according to the present invention to the light receiving element controls the operation of the home appliance, the air conditioner control device, the security device, and the like in the above- The present invention is not limited thereto.

The optical waveguide according to the present invention needs not only an optical system capable of guiding all the light irradiated from the compensation element to the light receiving element without flowing out to the outside but also need to guide all the light irradiated from one light emitting element to another light receiving element The present invention can be applied to an optical system having an optical system.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. Will be clear to those who have knowledge of.

1, 11: light emitting element 2, 12: light receiving element
3, 13: a light source for compensation 7, 17:
8, 18: partition wall 9: reflector
14: shielding walls 15, 15 ', 21: translucent resin layer
16: light absorbing resin layer 19: side wall
20: upper member 22: light outlet face
23: Reflecting surface 24: Interface surface of translucent resin layer
100, 200, 300, 400: optical waveguide
A: first optical waveguide part B: second optical waveguide part
h2: Height of the light receiving element h3: Height of the light source for compensation
h4: height of shielding wall hw: height of shielding wall
t: Thickness of light-transmitting resin layer t2: Thickness of resin layer above light-receiving element
t3: thickness of the resin layer above the light source for compensation w4: width of the shielding wall
n1, n2: refractive index

Claims (11)

1. An optical waveguide for guiding light emitted from a compensation element to a light receiving element in an optical sensor structure comprising a compensation element for emitting light to a light receiving element for correcting operation signals of a light emitting element, a light receiving element and a light receiving element,
A side wall surrounding the compensation element and the light-receiving element to block light emitted to the side of the compensation element;
An upper member positioned on the upper side of the compensation element and attached to an upper end of the side wall to reflect light emitted upward from the compensation element in a downward direction; And
And a translucent resin layer applied to the inner surface of the upper member,
Wherein the light emitted from the compensation element is incident on the translucent resin layer coated on the inner surface of the upper member, the light incident on the translucent resin layer is reflected by the reflection surface of the inner surface of the upper member, And the light is guided to the light-receiving element through the light exit surface by repeating the operation of total reflection at the interface of the light-transmitting resin layer. The method according to claim 1,
Wherein the light transmitting resin layer is made of silicon. 3. The method of claim 2,
Wherein the refractive index of the silicon is 1.41 and the critical angle is 45.17 DEG. 3. The method according to claim 1 or 2,
Wherein the reflection surface of the inner surface of the upper member is formed by a combination of a regular reflection surface and a diffusive reflection surface. 3. The method according to claim 1 or 2,
And the side wall is formed integrally with a base portion on which the compensation element and the light receiving element are mounted. 3. The method according to claim 1 or 2,
And the upper member is formed integrally with the side wall. 3. The method according to claim 1 or 2,
And a shielding wall is provided between the compensation element and the light receiving element. 1. An optical waveguide for guiding light emitted from a compensation element to a light receiving element in an optical sensor structure comprising a compensation element for emitting light to a light receiving element for correcting operation signals of a light emitting element, a light receiving element and a light receiving element,
A side wall surrounding the compensation element and the light-receiving element to block light emitted to the side of the compensation element; And
And an upper member positioned on the upper side of the compensation element and attached to an upper end of the side wall to reflect light emitted upward from the compensation element in a downward direction,
The reflection surface of the inner surface of the upper member is formed by a combination of the regular reflection surface and the irregular reflection surface so that the light emitted upward from the compensation element is reflected by the reflection surface of the inner surface of the upper member to be guided to the light reception element Characterized by a light waveguide. 9. The method of claim 8,
And a shielding wall is provided between the compensation element and the light receiving element. A light sensor structure for controlling the operation of a portable terminal, the light sensor comprising: a compensation element which is provided above a display unit of the portable terminal and emits light to the light receiving element to correct operation signals of the light emitting element, An optical waveguide for guiding light emitted from a compensation element to a light receiving element,
A base unit mounted on an upper portion of the display unit of the portable terminal;
A side wall surrounding the compensating element and the light receiving element mounted on the base and shielding light emitted to the side of the compensating element;
An upper member positioned on the upper side of the compensation element and attached to an upper end of the side wall to reflect light emitted upward from the compensation element in a downward direction; And
And a translucent resin layer applied to the inner surface of the upper member,
Wherein the light emitted from the compensation element is incident on the translucent resin layer coated on the inner surface of the upper member, the light incident on the translucent resin layer is reflected by the reflection surface of the inner surface of the upper member, And the light is guided to the light-receiving element through the light exit surface by repeating the operation of total reflection at the interface of the light-transmitting resin layer. A light sensor structure for controlling the operation of a portable terminal, the light sensor comprising: a compensation element which is provided above a display unit of the portable terminal and emits light to the light receiving element to correct operation signals of the light emitting element, An optical waveguide for guiding light emitted from a compensation element to a light receiving element,
A base unit mounted on an upper portion of the display unit of the portable terminal;
A side wall surrounding the compensating element and the light receiving element mounted on the base and shielding light emitted to the side of the compensating element; And
And an upper member positioned on the upper side of the compensation element and attached to an upper end of the side wall to reflect light emitted upward from the compensation element in a downward direction,
The reflection surface of the inner surface of the upper member is formed by a combination of the regular reflection surface and the irregular reflection surface so that the light emitted upward from the compensation element is reflected by the reflection surface of the inner surface of the upper member to be guided to the light reception element Characterized by a light waveguide.

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