KR101174441B1 - Optical input device using side directional light source - Google Patents

Abstract

The present invention is thinner than conventional, performs excellent functions, and replaces expensive prism or pranel lenses, the production cost is low, and eliminates the reflections that can occur in the lens structure, high precision and low probability of malfunction As to provide an optical input device using a side-directed light source,
An optical input device using a lateral light source according to the present invention includes a circuit board having an optical sensor for detecting light, a light source assembly connected to the circuit board, and having a lateral orientation, and positioned on an upper surface of the circuit board. And a cover for forming a light source, wherein the light source assembly has a light emitting device for emitting light and a reflecting plate positioned on an upper portion of the light emitting device and having a reflective surface set at a predetermined angle with respect to the circuit board to change a path of the emitted light. It includes.

Description

Optical input device using side-oriented light source {OPTICAL INPUT DEVICE USING SIDE DIRECTIONAL LIGHT SOURCE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical input device using a lateral light source, and more particularly, to an optical input device using a lateral light source used to input a command to an electronic device.

As the field of computer science has developed, a variety of devices have been developed that allow users to enter information into computer devices. One group of such devices is called a pointing device. As the user manipulates the components of this device, position data corresponding to the movement of the pointing device is generated. This position data is then converted into movement of the pointer image appearing on the display.

Thus, by moving the pointing device, the user can associate the pointer image with the objects displayed on the display. The object refers to a user interface that performs a specific operation when a menu, a button, an image, or the like is selected. Thereafter, the user may perform a specific command related to the object through a selection operation such as pressing a specific button of the pointing device.

Users of general personal computers use Microsoft's Windows as an operating system (OS) to run their own computers. This is due to convenient mouse functions and various graphic functions that are not supported by the existing DOS (Disk Operating System) system. When a user enters a specific command through a window, the user can drag, scroll, or click the mouse without typing a keyboard. You can easily enter a command by, for example.

In recent years, as portable small electronic products such as smart phones, PDAs, and netbooks have come into the spotlight, technology for miniaturizing and transplanting a mouse, which is one of input devices, has been developed. In particular, as a small portable device such as a smart phone is widely used, a configuration corresponding to a mouse for facilitating movement and control of a cursor has been required. Recently, an optical input device for this has been proposed.

In the conventional optical input device, as shown in FIG. 1, an optical sensor 20 for detecting position information by detecting light on a PCB substrate 10 is connected, and an aperture is formed so that the light may be collected by the optical sensor 20. An optical filter 40 which performs a role and is positioned between the first light blocking unit 30 to block external light and the first light blocking unit 30 and the optical sensor 20 to pass only light having a specific wavelength. ). The upper end of the first light blocking unit 30 is provided with a lens 50 that performs a light condensing function so that the light from the LED light source 80 can be directed to the optical sensor 20, the lens 50 from the body It further comprises a second light blocking unit 60 to protect it from being separated and to block external light, to protect the above configuration from the outside, and similarly comprises a cover 70 to block unnecessary external light.

Light originating from the LED light source 80 of the optical input device is collected through a prism or a pranel lens 90 or the like and transmitted to an object surface forming one side of the cover 70 provided to be in contact with the outside. Light reflected by the contact surface of an object located on the surface is transmitted to the optical sensor 20 through the lens 50. Based on the reflected light, shape information of the object in contact with the object surface is found, and based on this, displacement information is detected by comparing shape information on a predetermined time basis. Since the light finally reaching the optical sensor 20 in the above process should be purely the light emitted from the LED light source, the remaining lights are the cover 70, the first and second light blocking parts 30, 60), and is blocked through the optical filter 40.

As described above, in the conventional optical input device, the light starting from the LED light source 80 is collected by changing the traveling direction of the light through the prism structure or the pranel type structure 90 to the objective surface of the cover 70. Delivered. The prism structure 90 includes a condenser lens for condensing light, a reflecting surface for reflecting the condensed light source, and an emission surface for transmitting the reflected light source to the object surface. In order to manufacture such a precise reflective surface, it is required to manufacture a precise mold. To this end, a high production cost is required, and when the precision of the mold decreases finely, a problem occurs in the direction of light or the light condensing function. Because of problems in operation, the precision mold for producing the prism or pranel lens 90 of the present invention has a shorter lifespan compared to the general mold, and thus has to be frequently replaced.

In addition, in the conventional optical input device, as illustrated in FIG. 2, the prism structure 90 reflecting light and the lens structure 40 are adjacent to each other, so that a part of the light emitted from the light source is diffusely reflected in the lens structure 40. There is a problem that occurs, some of them directly reach the lens 42 to reduce the accuracy of the optical input device and cause malfunctions that the user does not intend. Although there is a case where the light blocking wall 44 is formed to prevent this, it is difficult to solve the diffuse reflection problem only by the configuration of the light blocking wall 44, and still some light is transmitted through the lens 42. do.

SUMMARY OF THE INVENTION The present invention has been conceived based on these points, and the problem to be solved by the present invention is to provide an optical input device using a side-directed light source that is thinner than the prior art and performs an excellent function.

Another object of the present invention is to provide an optical input device using a directional light source having a low production cost by replacing a high-cost prism or prasnel lens.

Another object of the present invention is to provide an optical input device using a side-directed light source with high precision and low probability of malfunction by eliminating diffuse reflection that may occur in the lens structure.

The objects of the present invention are not limited to the above-mentioned objects, and other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

In order to solve this problem, an optical input device using a lateral light source according to an embodiment of the present invention includes a circuit board having an optical sensor for detecting light, a light source assembly connected to the circuit board, and having a lateral orientation, and the circuit A cover disposed on an upper portion of the substrate to form an objective surface, wherein the light source assembly includes a point light source that emits light and a predetermined position with respect to the circuit board so as to be positioned above the point light source to change a path of the emitted light. And a reflecting plate having a reflecting surface set at an angle.

An optical input device using a side-oriented light source assembly according to another embodiment of the present invention is a circuit board having an optical sensor for detecting light, a light source assembly connected to the circuit board, having a side-oriented, and an upper portion of the circuit board A first light blocking part formed at a cover to form an objective surface, and covering the optical sensor, and having a guide hole for guiding the light emitted from the light source assembly and reflected by the objective surface to the optical sensor, The light source assembly includes a point light source that emits light and a reflecting plate having a reflection surface that is positioned above the point light source and is set at an angle with respect to the circuit board so as to change a path of the emitted light.

As described above, the optical input device using the lateral light source according to the embodiments of the present invention removes a prism lens or a pranel lens, which is an essential component for refracting or reflecting light emitted from the light source in a desired direction, and has lateral orientation. By adopting the light source, it is possible to prevent wrong image information due to the diffuse reflection between the light blocking unit and the adjacent prism lens from being detected by the optical sensor, and to reduce additional cost according to the prism structure.

A more detailed example of the optical input device using the side-directed light source according to the present invention will be described later in the embodiments with reference to the drawings.

The optical input device using the side-directed light source according to the present invention can perform an excellent function while thinner than the conventional.

In addition, by eliminating expensive prism or prasnel lenses and employing a directional light source, it is possible to reduce the production cost of the prism lens.

In addition, since the light reflection or refraction process is unnecessary due to the directional light source, an optical input device using a directional light source with high precision and low probability of malfunction is eliminated by eliminating diffuse reflection that may occur in the lens structure during the reflection and refraction process. can do.

The effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the present specification.

1 is a view showing the structure of a conventional optical input device.
2 is a diagram illustrating an adjacent structure of a prism lens and an optical lens of a conventional optical input device.
3 is an exploded perspective view of an optical input device using a side-directed light source according to an embodiment of the present invention.
4 is a cross-sectional view showing in detail the configuration of the light source assembly of FIG.
5 is an exploded perspective view of an optical input device using a side-directed light source according to another embodiment of the present invention.
FIG. 6 is a cross-sectional view of an optical input device using the lateral light source of FIG. 5.
FIG. 7 is a perspective view illustrating a first light blocking unit having a wall structure among components of an optical input device using the lateral light source of FIG. 5.
8 is a cross-sectional view of an optical input device using a side-directed light source according to another embodiment of the present invention.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention, and the general knowledge in the art to which the present invention pertains. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. &Quot; and / or "include each and every combination of one or more of the mentioned items. ≪ RTI ID = 0.0 >

Although the first, second, etc. are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical scope of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. As used herein, "comprises" and / or "comprising" does not exclude the presence or addition of one or more other components in addition to the mentioned components.

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used in a sense that can be commonly understood by those skilled in the art. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

The spatially relative terms " below ", " beneath ", " lower ", " above ", " upper " It may be used to easily describe the correlation of a component with other components. Spatially relative terms are to be understood as including terms in different directions of components in use or operation in addition to the directions shown in the figures. For example, when inverting an element shown in the figures, an element described as "below" or "beneath" of another element may be placed "above" another element . Thus, the exemplary term "below" can include both downward and upward directions.

Hereinafter, with reference to the accompanying drawings will be described embodiments of the present invention.

First, with reference to FIGS. 3 and 4, an optical input device using a side-directed light source according to an embodiment of the present invention will be described. 3 is an exploded perspective view of an optical input device using a side-directed light source according to an embodiment of the present invention.

As described above, the optical input device using the side-directed light source of the present invention uses a light source having direct directivity without using a prism structure or a pranel structure for refraction and reflection of light, thereby directly from the light source to the upper surface of the cover. Can be reached. Therefore, it is possible to fundamentally block the positional error due to the diffuse reflection caused by the light refracted by the prism or the pranel lens directly incident on the lens, and the effect of cost reduction that occurs except for the prism structure is large.

Specifically, the optical input device using the side-directed light source according to an embodiment of the present invention is connected to the circuit board 110 having an optical sensor 112 for detecting light, and the circuit board 110, It includes a light source assembly 120 and a cover 160 positioned on the circuit board 110 to form an objective surface, the light source assembly 120 is a point light source 122 for emitting light and the It includes a reflecting plate 124 positioned on the point light source 122 and having a reflecting surface set at an angle with respect to the circuit board to change the path of the emitted light.

First, the circuit board 110 includes an optical sensor 112 on one surface thereof. In the circuit board 110, a circuit wiring connected to the optical sensor 112 and a circuit wiring connected to the light source assembly 120 are formed to operate a light source assembly 120 and to emit desired light to operate the optical sensor 112. It is.

The material of the circuit board 110 is not limited, and may be made of various materials such as polycarbonate. The circuit wiring formed on the circuit board 110 may be made of a metal having excellent conductivity, for example, copper.

After the light emitted from the light source assembly 120 reaches the cover, the optical sensor 112 detects the light reflected by the object located on the upper surface of the cover 160, and then the image information processor (not shown). Send information with). The optical sensor 112 may be spaced apart from each other at a predetermined distance from the light source assembly 120 to be described later. Specifically, the optical sensor 112 generates a constant signal upon receiving light, and the generated electrical signal is moved to the image information processor along the circuit wiring of the circuit board 110. The image information processing unit compares the captured frame with the previous frame to determine how much the object displacement has moved in which direction, and converts the image to a pixel unit on the display to move an object, for example, a pointer, to an appropriate position.

For example, when the object located on the upper surface of the cover 160, that is, the object surface, is a human finger, a finger image such as a fingerprint contacting the object surface is obtained every frame. By comparing the fingerprint images obtained continuously for a short time, it is determined in which direction the finger moved during the time corresponding to each frame. The position of the pointer is moved on the display based on the determined information.

The light source assembly 120 is located on the point light source 122 emitting the light and the reflection surface set at an angle with respect to the circuit board 110 so as to change the path of the emitted light. It may include a reflector 124 having a. Since the light source assembly 120 according to the present exemplary embodiment has a reflecting plate 124 having a reflective surface on its own, the light emitted from the point light source 122 may have side orientation even without a separate prism or pranel lens. Can be reached directly. The type of the point light source 122 is not limited, and a light emitting device such as a light emitting diode (LED) which can be driven with low power and exhibits a constant luminance may be used. The light emitted from the point light source 122 may be set to have a wavelength of another region in addition to the general visible light wavelength. A detailed configuration of the light source assembly 120 will be described later with reference to FIG. 4.

Subsequently, the cover 160 is positioned on the circuit board 110 to be combined with the circuit board 110 to protect the inside of the circuit board 110. As described above, the cover 160 is formed to form an objective surface. The pointer can be manipulated to a desired position by placing a finger or the like on the outer surface and moving it.

The height of the cover 160 may be at least equal to or higher than the height of the light source assembly 120. As described above, since the light source assembly 120 having directivity is used without using a prism structure or a pranel structure for refraction and reflection of light, the overall thickness can be reduced as compared with the conventional optical input device. This is advantageous in terms of slimming the product, which is a recent trend.

4 is a cross-sectional view showing in detail the configuration of the light source assembly 120 according to an embodiment of the present invention.

The light emitting device 122 emits light by power supply wiring connected from the circuit board 110. The light emitting device 122 may be attached to one side of the light source assembly 120. More specifically, the light emitting device 122 may be installed so that the emitted light is directed upward, thereby improving the light efficiency of reaching the objective surface of the cover 160. That is, when the light emitting device 122 is installed such that the light emitted from the light emitting device 122 is emitted in the left direction of FIG. 4, the light reaching the top is reduced, so that the light emitted to increase the light efficiency is reduced. It may be installed to face upward.

The light source assembly 120 having directivity has a reflective surface structure in which light can be emitted in a specific direction, and since light can be collected in a predetermined direction, the optical efficiency is superior to a conventional light source. As described above, the light used for the light source 120 may use a long wavelength region having excellent transmittance, and preferably light having a wavelength of 650 to 700 nm.

The light emitted from the light emitting element 122 reaches the reflecting plate 124 having a reflecting surface provided above. Since the light source assembly 120 is installed at one side of the circuit board 110, that is, the cover 160, it is necessary to direct the light emitted from the light source assembly 120 toward the center of the cover 160. Therefore, as described above, the light is configured to reach the center portion of the cover 160 by using a prism structure or a pranel structure for refraction and reflection of light in the conventional case.

To solve this problem, the light source assembly 120 according to the embodiment of the present invention includes a reflector plate 124. The reflecting plate 124 is provided on the upper side of the light emitting device 122 and has a reflective surface oblique to form a predetermined angle with the circuit board 110. The reflector 124 may be made of one or more materials selected from glass, plastic, ceramic, and metal having excellent reflection efficiency, so that light may be refracted in a desired direction.

In addition, the reflecting plate 124 of the light source assembly 120 may be provided to be adjustable so that the reflecting surface has an angle different from the predetermined angle. That is, the reflecting plate 124 is rotatably provided, for example, to change a predetermined angle formed with the circuit board 110 around the rotation axis, and to change the mounting angle rather than the rotation method to change the predetermined angle. It may have a configuration to make.

As described above, in the optical input device using the side-oriented light source according to the embodiment of the present invention, the light emitted from the light source assembly 120 may reach the upper surface of the cover 160 directly without a separate optical member. Therefore, it is possible to fundamentally block the positional error due to diffuse reflection caused by the light refracted by the prism or the pranel lens directly entering the lens, and reduce the manufacturing cost by excluding the prism structure.

Next, an optical input device using a side-directed light source according to another embodiment of the present invention will be described with reference to FIGS. 5 to 7. FIG. 5 is an exploded perspective view of an optical input device using the lateral light source according to another embodiment of the present invention, FIG. 6 is a cross-sectional view of the optical input device using the lateral light source of FIG. 5, and FIG. 7 is a side directional light of FIG. 5. A perspective view showing a first light blocking unit having a wall structure among components of an optical input device using a light source.

The optical input device using the side-directed light source according to another embodiment of the present invention is a circuit board 110 having an optical sensor 112 for detecting light, and a light source connected to the circuit board 110, having a side orientation An assembly 120, a cover 160 positioned on the circuit board 110 to form an objective surface, and covering the optical sensor 112, and emitted from the light source assembly 120 to the objective surface. And a first light blocking unit 130 having a guide hole 134 for guiding the light reflected by the optical sensor 112, wherein the light source assembly 120 includes a light emitting device 122 for emitting light; Located on the light emitting device 122 includes a reflecting plate 124 having a reflective surface at a predetermined angle with respect to the circuit board 110 to change the path of the emitted light.

In addition to the light emitted from the light source 120 and reflected by an object normally located on the upper surface of the cover 160, the optical sensor 112 may receive information by light detected by unintended diffuse reflection or refraction. Can be. In this case, since accurate position change information cannot be extracted, an error may occur in positioning of a cursor or a pointer. Therefore, in order to prevent this, the optical input device using the side-directed light source according to another embodiment of the present invention may further include a first light blocking unit 130. The first light blocking unit 130 is positioned above the optical sensor 112, and serves as an aperture for guiding the reflected light to accurately reach the optical sensor 112 while blocking other light from passing through. do. That is, the first light blocking unit 130 is formed with a guide hole 134 through which light can pass at a position corresponding to the vertical upper portion of the optical sensor 112, and is incident vertically to guide the guide hole 134. Only the light passing through is incident on the optical sensor 112, and the incident light incident by the diffuse reflection or refraction does not have the angle of incidence perpendicular to the guide hole 134 and thus is blocked from passing through the guide hole 134.

As shown in FIG. 5, an optical input device using a side-directed light source according to another embodiment of the present invention includes a lens 140 inserted into the first light blocking unit 130 and incident on the lens 140. It may further include a second light blocking unit 150 for adjusting the amount of light to be.

As described above, a guide hole 134 is formed on an upper surface of the first light blocking unit 130, and the lens 140 is accommodated in the guide hole 134 to perform a lens accommodating part function. . That is, the lens 140 may be positioned directly in the guide hole 134, and a step may be formed around the guide hole 134 to be mounted on the step.

The lens 140 performs a function of condensing light passing in one direction, and the type of the lens 140 is not limited. For example, a convex lens type lens capable of performing a light collecting function may be used. The lens 140 is inserted into the first light blocking unit 130 as shown in FIG. 7.

On the other hand, when light arrives directly from the light source 120, since the optical input device using the side-directed light source may malfunction, as shown in FIG. 7 to block the first light blocking unit 130, A blocking wall 132 may be formed outside the lens accommodating part of the lens. Therefore, a part of the light emitted from the light source 120 may be blocked so as not to directly enter the lens 140, thereby preventing malfunction.

The second light blocking unit 150 may be provided on the lens 140. The second light blocking unit 150 is stacked on top of the first light blocking unit to protect the lens 140, and prevents incident light other than the light emitted from the light source 120 from entering the lens 140. To this end, the second light blocking unit 150 may also be made of a material that does not transmit light, such as the first light blocking unit, or may be coated with a blocking film on its outer surface. A through hole 152 may be formed to allow the light emitted by the light source assembly 120 to be incident on the lens 140. Therefore, all other than the light passing through the through hole 152 is blocked.

The second light blocking unit 150 is formed to be parallel to the circuit board 110 and extends to contact the inner surface of the cover 160, and the light emitted from the light source assembly 120 is upper surface of the cover 160. An opening 154 may be formed to reach. The opening 154 will be described later.

In the conventional optical input device, a lens structure including a lens and a prism structure is provided at the same time, and incorrect image information is input to the optical sensor through the lens due to diffuse reflection between them, thereby causing a malfunction. The optical input device using a directional light source adopts a configuration in which a prism lens is removed and a single lens 140 is inserted into the first light blocking unit 130, which is advantageous in terms of the overall thickness of the product and also in performance. By reducing the volume of unnecessary optics, malfunctions due to diffuse reflection or unplanned refraction or reflection are reduced.

Referring back to FIG. 6, the light from the light source assembly 120 having the side orientation reaches the cover 160 directly without the prism lens configuration, and the user places a finger or the like on the upper surface of the cover 160. When moved, the reflected light reaches the optical sensor 112 on the circuit board 110 through the second light blocking unit 150 and the first light blocking unit 130.

The emission angle of the light emitted from the light source 120 is determined differently according to the width of the circuit board 110, the height of the cover 160, and the angle of the reflecting plate 124. As shown in FIG. 6, in order to prevent the second light blocking unit 150 from blocking the traveling direction of the light emitted from the light source assembly 120, an opening 154 is formed in the second light blocking unit 150. Can be formed. That is, the through-hole 152 is reflected by the objective surface of the cover 160 when the reference to Figure 6 passes through the light downward (optical sensor direction) from the top, the opening 154 is a light source assembly The light exiting from 120 passes upward while forming a predetermined angle with the circuit board 110 upward from the lower portion. Alternatively, the configuration may be such that the area of the second light blocking portion 150 is made small so that the opening 154 is not formed. However, the area of the second light blocking portion 150 may be increased in order to increase the blocking rate of the light. The wider this is, the more advantageous it is. Therefore, the position of the opening 154 and the exit angle of the emitted light may be changed so that the light emitted from the light source 120 may pass through the opening 154 to reach the cover 160.

As described above, since the light does not interfere with the traveling direction of the light except for being reflected by the cover 160 starting from the light source assembly 120, the light loss rate is low and light does not deviate from the path due to refraction or the like.

In addition, as described above, the optical input device using the side-directed light source according to an embodiment of the present invention by removing the high-cost prism or pranel lens and employing the light source assembly 120 having a reflector plate 124, prism lens It is possible to reduce the production cost. In addition, since the reflection or refraction of light is unnecessary due to the light source assembly 120, the optical input using a side-oriented light source having high precision and low probability of malfunction by eliminating diffuse reflection that may occur in the lens structure during these reflection and refraction processes. A device can be provided.

Next, with reference to FIG. 8, an optical input device using a side-directed light source according to another embodiment of the present invention will be described. 8 is a cross-sectional view of an optical input device using a side-directed light source according to another embodiment of the present invention.

In the optical input device using the side-directed light source according to another embodiment of the present invention, unlike the previous embodiments, the lens assembly 140 is not provided in the guide hole 134 of the first light blocking unit 130. As illustrated in FIG. 8, the light blocking unit 130 may be interposed between the first light blocking unit 130 and the second light blocking unit 150. That is, by increasing the area and thickness of the lens assembly 140, it is possible to improve the light condensing function.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above embodiments, and may be manufactured in various forms within the scope of the present invention, and the present invention Those skilled in the art will understand that it can be implemented in other specific forms without changing the technical spirit or essential features of the present invention, the embodiments described above are exemplary in all respects and limited It is not limited to form.

110: circuit board 112: optical sensor
120: light source assembly 130: first light blocking portion
132: blocking wall 140: lens assembly
150: second light blocking portion 152: through hole
154: opening 160: cover

Claims (10)

A circuit board having an optical sensor for detecting light,
A light source assembly connected to the circuit board and having a side orientation;
Includes a cover positioned on the upper portion of the circuit board to form an objective surface,
The light source assembly includes a light emitting device for emitting light; And a reflecting plate positioned on an upper portion of the light emitting element and having a reflecting surface set at an angle with respect to the circuit board so as to change a path of the emitted light. A circuit board having an optical sensor for detecting light,
A light source assembly connected to the circuit board and having a side orientation;
A cover positioned on an upper portion of the circuit board to form an objective surface;
A first light blocking unit covering the optical sensor and having a guide hole for guiding the light emitted from the light source assembly and reflected by the object surface to the optical sensor,
The light source assembly includes a light emitting device for emitting light; And a reflecting plate positioned on an upper portion of the light emitting element and having a reflecting surface set at an angle with respect to the circuit board so as to change a path of the emitted light. The method according to claim 1 or 2,
The light source assembly is located on the circuit board, the light source assembly and the optical sensor is an optical input device using a side-oriented light source assembly spaced apart from each other. The method according to claim 1 or 2,
The reflection plate of the light source assembly is an optical input device using a side-oriented light source assembly made of at least one material selected from glass, plastic, ceramic and metal. The method according to claim 1 or 2,
And a reflection plate of the light source assembly using a side-oriented light source assembly which is adjustable such that its reflecting surface has an angle different from the predetermined angle. The method according to claim 1 or 2,
The light emitting device is an optical input device using a side-oriented light source assembly that emits upward toward the object surface. The method of claim 2,
And a sidewall light source assembly having a blocking wall for blocking light reaching directly from the light source assembly. The method of claim 2,
A lens assembly inserted into the guide hole of the first light blocking unit;
And a second light blocking unit formed at a position corresponding to the guide hole to adjust an amount of light incident on the lens assembly. The method of claim 8,
The second light blocking unit is formed to be parallel to the circuit board and extends to contact the cover, wherein the side-oriented light source assembly having an opening so that light emitted from the light source assembly reaches the upper surface of the cover Input device. The method of claim 8,
And the lens assembly is positioned between the first light blocking portion and the second light blocking portion to space the first light blocking portion and the second light blocking portion.

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