TWI484223B - An optical component for multi-angle illumination of line scanning, and a light source system using the same - Google Patents

Description

Optical component for multi-angle illumination of line scan and light source system using same

The present invention relates to an assembly for diffusing light projected by a light source, and more particularly to an optical assembly for multi-angle illumination of line scans and a light source system using the same.

The light source system plays a pivotal role in automatic optical inspection (AOI). For example, precision automated optical inspection is required in the manufacture of liquid crystal displays, wafers of semiconductor integrated circuits, and related circuits. However, an important factor in the detection is the provision of illumination for the detection area.

The conventional lighting device simply projects a light source, such as a light-emitting diode, against the detection area, so that the light source disposed in the limited space of the precision detecting instrument cannot be effectively utilized, and the detection area cannot be provided. Good lighting brightness.

It is an object of the present invention to provide multiple angle illumination.

Another object of the invention is to reduce the volume occupied by the optical components required to project the light source.

Still another object of the present invention is to reduce the weight of the optical components required to project the light source.

To achieve the above and other objects, the present invention provides an optical component for multi-angle illumination of line scan, comprising: a first light transmissive element, wherein only a surface is formed with light from the surface, and the incident is only a three-dimensional pattern that converges on one dimension; a second light-transmitting element that is shaped only on one surface a three-dimensional pattern in which the light incident from the first light-transmitting element is incident from the surface is concentrated only in the first dimension, and the second light-transmitting element has the surface of the three-dimensional pattern for the first through The light element has a surface of the three-dimensional pattern; and a light-shaping diffusion film layer diffuses the incident light in a second dimension, and is located on a surface of the first light-transmitting element that does not have the three-dimensional pattern, and the second transparent The light element does not have the surface of the three-dimensional pattern, and between the first light-transmitting element and the second light-transmitting element and is in contact with the first light-transmitting element and the second light-transmitting element. One of them.

To achieve the above and other objects, the present invention further provides a light source system for projecting light into a target region, comprising: a plurality of light sources projecting a light source toward the target region; and a plurality of optical components, each optical component being separately One of the light sources, the optical components are located between the light source and the target region, wherein the optical component comprises: a first light transmissive element, and light is formed on the surface from only one surface a three-dimensional pattern that is concentrated only in the first dimension; the second light-transmissive element is formed on only one surface, and the light incident from the first light-transmitting element is incident from the surface, and is concentrated only in the first dimension. a three-dimensional pattern, wherein the second light-transmitting element has a surface of the three-dimensional pattern facing the first light-transmitting element; and a light-forming diffusion film layer is configured to make the incident light in the second dimension And diffusing on the surface of the first light-transmitting element that does not have the three-dimensional pattern, the surface of the second light-transmitting element that does not have the three-dimensional pattern, and the first light-transmitting element and the second light-transmitting layer And in contact with the first light-transmissive member and said second member between the light-transmitting member, one of these three positions.

In an embodiment of the invention, the three-dimensional pattern is a plurality of protrusions protruding from the surface of the light-transmitting element, and the protrusions are shaped from a hemisphere or a square pyramid.

In one embodiment of the present invention, the first light transmissive element and the second light transmissive element are Fresnel lenses, and the three-dimensional pattern is such that the first light transmissive element and the second light transmissive element form a phenanthrene The pattern of the Ner lens.

Thereby, the opposite arrangement of the faces of the two light-transmitting elements having the three-dimensional pattern facing each other will greatly reduce the weight and volume of the light-transmitting elements, and, in conjunction with the light-shaping diffusion film layer, further make the light source After becoming a line source through the action of the optical component, a larger angle of illumination can be provided in this dimension, thereby enabling the illumination source to provide high-intensity illumination to the target zone.

100‧‧‧Optical components

110‧‧‧First light transmitting element

112‧‧‧Second light transmitting element

115a‧‧‧The first light transmissive element has a three-dimensional pattern

115b‧‧‧The second light transmissive element has a three-dimensional pattern

120‧‧‧Light forming diffusion film

200‧‧‧Light source

300‧‧‧ Target area

H‧‧‧ area

Line of L‧‧‧Light

X‧‧‧axis direction

Y‧‧‧ axis direction

Figure 1 is a schematic illustration of an optical assembly in accordance with one embodiment of the present invention.

2 is a schematic view of an optical component in another embodiment of the present invention.

3A is a schematic view showing a first aspect of an optical component in still another embodiment of the present invention.

Figure 3B is a schematic view of a second aspect of the optical assembly in accordance with still another embodiment of the present invention.

3C is a schematic view showing a third aspect of the optical component in still another embodiment of the present invention.

Figure 4 is an isometric view of the light path after the light has passed only the Fresnel lens group.

Figure 5 is a side elevational view of the light path of the light passing through the optical assembly in accordance with an embodiment of the present invention.

Fig. 6 is a plan view showing a light path of a light source system using an optical component in an embodiment of the invention.

In order to fully understand the objects, features and effects of the present invention, the present invention will be described in detail by the following specific embodiments and the accompanying drawings, which are illustrated as follows: First, refer to FIG. A schematic diagram of an optical component in an embodiment of the invention. The optical component 100 disclosed in the present invention comprises: a first light transmissive element 110, a second light transmissive element 112, and a Light Shaping Diffuser (LSD) 120.

The first light transmissive element 110 has a three-dimensional pattern 115a on only one surface. The three-dimensional pattern 115a functions as a light when the light is incident from the surface having the three-dimensional pattern 115a. Convergence is only done on a single dimension (eg, the first dimension). The three-dimensional pattern 115a can be produced by roughening the surface of one of the first light-transmitting elements 110 to form a protrusion. The shape of the protrusion of the three-dimensional pattern 115a can be achieved by different shapes to achieve the aforementioned function of "the light system is concentrated only in the first dimension (such as on the X-axis)", which is familiar to those skilled in the art. It can be easily completed, for example, a hemisphere or a square pyramid can be applied, but the invention is not limited thereto. Among them, the first picture is a hemisphere, and the second picture is an example of a square pyramid, which can converge the incident light in a single dimension. Convergence on a single dimension will be described in more detail later with reference to Figure 5.

The second light transmissive element 112 is the same as the first light transmissive element 110. In the present invention, the first light transmissive element 110 and the second light transmissive element 112 are opposite in a special arrangement. That is, the surface of the second light-transmitting element 112 having the surface of the three-dimensional pattern 115b facing the first light-transmitting element has the surface of the three-dimensional pattern 115a, which can be seen with reference to FIGS. 1 and 2.

The light-forming diffusion film layer 120 is used to cause the incident light to produce a diffusion phenomenon in a second dimension (such as the Y-axis) in a single dimension, and the degree of diffusion in the remaining dimensions does not affect the formation of light in the first dimension. For a line segment, that is, the light system is mainly diffused in the second dimension, and even if the light-forming diffusion film layer 120 has a diffusion phenomenon in the first dimension, it does not affect the convergence in the first dimension to be achieved in the present case. In turn, the light from the light source does not cause a diffusion phenomenon that affects the formation of light into a line segment in the first dimension (eg, in the X-axis direction).

For the light-forming diffusion film layer 120, for example, a light-formed diffusion film layer of the LSD series produced by Luminit, LLC, USA can be used. The light-formed diffusion film layer 120 is preferably used in a thickness of less than 1 mm. The diffusion angle of the light-forming diffusion film layer 120 (defined in the present invention as the diffusion angle in the Y-axis direction) may be a diffusion angle of 60 degrees or 80 degrees or the like. For example, when the 60 degree*1 degree LSD system is used, the diffusion angle in the Y-axis direction is 60 degrees, and the diffusion angle in the X-axis direction is only 1 degree. In the narrow space of the optical detecting device, the 1 degree spread angle does not affect the extent to which light is formed into a line segment. The diffusion only in the second dimension will be described in more detail later with reference to Figure 6. The light-shaping diffusion film layer 120 can be located at one of the following three positions: 1. The first light-transmitting element 110 does not have the surface of the three-dimensional pattern 115a; 2. The second light-transmitting element 112 does not have the three-dimensional pattern 115b. 3, the first light transmissive element 110 and the second light transmissive element 112 are in contact with the first light transmissive element 110 and the second light transmissive element 112.

Preferably, the optical component 100 is composed only of the first light transmitting component 110, the second light transmitting component 112, and the light shaping diffusion film layer 120. That is, when the light-forming diffusion film layer 120 is not located between the first light-transmitting element 110 and the second light-transmitting element 112, the first light-transmitting element 110 and the second light-transmitting element 112 are in direct contact. Together (refer to Figure 3A~3C).

Next, please refer to FIGS. 3A-3C, which are schematic diagrams showing first to third aspects of the optical component in still another embodiment of the present invention. In the present embodiment, the three-dimensional patterns 115a, 115b which are formed by roughening the surface of one of the first light-transmitting element 110 and the second light-transmitting element 112 are formed to form a Fresnel lens (Fresnel Lens) The pattern of the first light transmitting element 110 and the second light transmitting element 112 is a Fresnel lens, for example, a lens group composed of a two-linear Fresnel lens, and some applications for line scanning The preferred method uses a Fresnel lens with a focal length of 0.25 to 6 inches. 3A is a schematic view of the light-shaping diffusion film layer 120 on the surface of the first light-transmitting element 110 that does not have the three-dimensional pattern 115a; FIG. 3B is a view that the light-shaping diffusion film layer 120 is located on the second light-transmitting element 112. A schematic view on the surface of the three-dimensional pattern 115b; a third light-patterned diffusion film layer 120 is located between the first light-transmitting element 110 and the second light-transmitting element 112 and is in contact with the first light-transmitting element 110 and the A schematic view of the second light transmissive element 112.

The optical component of the present invention is condensed by two special light-transmitting elements only in the first dimension The opposite arrangement of the pieces, and the arrangement of the light-forming diffusing film layer diffused in the second dimension, allows the light passing through the optical component to be concentrated into a long bright line for use by the scanning light on the optical detecting device .

Next, please refer to Fig. 4, which is an isometric view of the light path after the light passes only the Fresnel lens group. As shown in the figure, after the light emitted by the light source 200 passes through the Fresnel lens group (ie, two Fresnel lenses arranged opposite each other), a convergence phenomenon occurs in the direction of the first dimension (X-axis), and In the direction of the second dimension (Y-axis), there is almost a phenomenon of straight forward and no diffusion, and the line segment L of the concentrated light is relatively short.

Next, please refer to FIG. 5, which is a side view of the light path of the light in the embodiment of the present invention after passing through the optical component. As shown, the light emitted by the light source 200, after passing through the optical assembly 100 of the present invention, causes a converging phenomenon in the direction of the first dimension (X-axis).

Next, please refer to FIG. 6, which is a plan view of a light path of a light source system using an optical component in an embodiment of the present invention. The light source system is used to project light to a range in which the target zone 300 is located. In the light source system, a plurality of light sources 200 are used (the sixth figure is exemplified by three LED light sources), and the light emitted by each light source 200 passes through the optical component 100 of the present invention, except that the first image shown in FIG. 5 is In the direction of the one dimension (X-axis), the phenomenon of diffusion may be further generated in the direction of the second dimension (Y-axis), and the light diffusion of one piece of the optical component 100 corresponding to each light source 300 is formed. The device (consisting of a plurality of optical components) effectively increases the illumination intensity of the intermediate portion of the target zone 300 because the light of each source substantially increases the illumination angle in the second dimension after passing through the optical component 100. Instead, the illumination area projected by the adjacent light source on the target zone 300 can contribute more illumination angles, such as the H zone shown in FIG.

In summary, the present invention allows the light in the first dimension to be concentrated by the opposite arrangement of the faces of the two light-transmitting elements having the three-dimensional pattern facing each other, and by the phase of the light-forming diffusion film layer. Under the mutual matching, the illumination angle of the light in the second dimension is enlarged, thereby providing more angles of illumination light to the target area, and further, the relative arrangement of the two transparent elements makes the weight and volume of the transparent element more. Significantly reduced, reducing the volume occupied in the limited space of the optical detection device.

The invention has been described above in terms of the preferred embodiments, and it should be understood by those skilled in the art that the present invention is not intended to limit the scope of the invention. It should be noted that variations and permutations equivalent to those of the embodiments are intended to be included within the scope of the present invention. Therefore, the scope of protection of the present invention is defined by the scope of the patent application.

100‧‧‧Optical components

110‧‧‧First light transmitting element

112‧‧‧Second light transmitting element

115a‧‧‧The first light transmissive element has a three-dimensional pattern

115b‧‧‧The second light transmissive element has a three-dimensional pattern

120‧‧‧Light forming diffusion film

Claims (6)

An optical component for multi-angle illumination of line scan, comprising: a first light transmissive element, wherein only a surface is formed with a three-dimensional pattern in which light is incident from the surface and is concentrated only in the first dimension; The optical element has a three-dimensional pattern in which only light incident on the surface of the first light-transmitting element is concentrated from the surface and is concentrated only in the first dimension, and the second light-transmitting element has the three-dimensional pattern. The surface of the first light-transmitting element has a surface of the three-dimensional pattern; and a light-shaping diffusion film layer diffuses incident light rays in a second dimension to form linear scanning light, and is located at the second light-transmitting element The surface that does not have the three-dimensional pattern, wherein the incident light rays sequentially pass through the first light transmitting element, the second light transmitting element, and the light forming diffusion film layer. The optical component according to claim 1, wherein the three-dimensional pattern is a plurality of protrusions protruding from a surface of the light-transmitting element, and the protrusions are selected from a hemisphere or a square pyramid. The optical component of claim 1, wherein the first light transmissive element and the second light transmissive element are Fresnel lenses, the three-dimensional pattern is such that the first light transmissive element and the second The light transmissive element forms a pattern of Fresnel lenses. A light source system for projecting light to a target area, comprising: a plurality of light sources projecting a light source toward the target area; and a plurality of optical components, each of the optical components respectively corresponding to one of the light sources, the optical components Located between the light source and the target area, the optical component comprises: a first light transmissive element, a three-dimensional pattern formed on a surface from which light is incident from the surface only in a first dimension; The second light transmissive element is formed on only one surface with a stereoscopic pattern in which the light incident from the first light transmissive element is concentrated from the surface and is concentrated only in the first dimension, and the second light transmissive element has the same The surface of the three-dimensional pattern is opposite to the surface of the first light-transmitting element; and a light-shaping diffusion film layer diffuses the incident light in a second dimension to form linear scanning light, and is located at the first The two light transmissive elements do not have the surface of the three-dimensional pattern, wherein the incident light rays sequentially pass through the first light transmitting element, the second light transmitting element, and the light forming diffusion film layer. The light source system of claim 4, wherein the three-dimensional pattern in each optical component is a plurality of protrusions protruding from a surface of the light-transmitting element, and the shape of the protrusions is selected from a hemisphere Or square pyramids. The light source system of claim 4, wherein the first light transmitting element and the second light transmitting element in each optical component are Fresnel lenses, and the three-dimensional pattern is such that the first The light transmissive element and the second light transmissive element form a pattern of Fresnel lenses.