TWM590694U - Point projection device for changing light-traveling direction - Google Patents

Abstract

The present disclosure provides a point projection device for changing the direction of the light. The point projection device is including a substrate, a supporting member, a light-emitting element, and an optical lens. The supporting member is disposed on the substrate. The light-emitting element is disposed on the substrate and surrounded by the supporting member. The optical lens is disposed on a top surface of the supporting member and covers the light-emitting element. The optical lens has a reflective layer, a light-emitting surface, and a convex surface, wherein the light-emitting surface is adjacent to the convex surface, and the reflective layer is disposed on the convex surface. The light- emitting surface extends upward from the top surface of the supporting member, and the reflective layer is disposed above the light-emitting element, and the reflective layer is configured to reflect the light of the light-emitting element to the light-emitting surface for emitting the light.

Description

Point projection device for changing light traveling direction

The present invention relates to a point projection device that changes the traveling direction of light.

With the vigorous development of optical technology, structured light has been used in many fields, such as: 3D contour reproduction, distance measurement, anti-counterfeiting identification and other fields. However, in the prior art, the structure light can be generated by laser through a diffractive optical element (DOE).

However, there must be a sufficient distance (telephoto) between the diffractive optical element and the laser light source to allow the imaging position of the light to be extended. Therefore, it is difficult to reduce the total height of the projection device, which is not conducive to a thin design.

One technical aspect of the present invention is a projection device that changes the direction of light travel.

According to an embodiment of the present invention, a projection device that changes the direction of light travel includes a substrate, a support, a light emitting element, and an optical lens. supporting item Set on the substrate. The light emitting element is disposed on the substrate and surrounded by the support. The optical lens is arranged on the top surface of the support and covers the light emitting element. The optical lens has a reflective layer, an adjacent light exit surface and a convex surface, and the reflective layer is located on the convex surface. The light exit surface extends upward from the top surface of the support, the reflective layer is located above the light emitting element, and the reflective layer is configured to reflect the light of the light emitting element to the light exit surface to emit light.

In some embodiments of the present invention, the reflective layer is configured to reflect the light from the light emitting element in the first direction to the second direction and pass through the light exit surface, where the first direction is perpendicular to the second direction.

In some embodiments of the present invention, there is a first distance between the light-emitting element and the reflective layer, and a second distance between the reflective layer and the light-emitting surface. The path length of the light-emitting element light before exiting the light-emitting surface is the first distance and The sum of the second distance.

In some embodiments of the present invention, the light exit surface of the optical lens has a diffractive optical element.

In some embodiments of the present invention, the reflective layer extends from the top surface of the support to the edge of the light exit surface.

In some embodiments of the present invention, the light emitting element is a vertical cavity surface emitting laser (VCSEL).

In some embodiments of the present invention, the projection device for changing the traveling direction of light further includes an upper cover, which is disposed on the optical lens and has a concave surface, and the concave surface is coupled with the convex surface of the optical lens.

In some embodiments of the present invention, the reflective layer is located between the concave surface of the upper cover and the convex surface of the optical lens.

In some embodiments of the present invention, the upper cover has a top surface facing away from the concave surface, and the top surface is a flat surface, configured to be sucked by the suction nozzle.

In some embodiments of the present invention, the projection device that changes the traveling direction of light further includes a reflecting mirror, which is located outside the optical lens and faces the light exit surface of the optical lens.

In the above-mentioned embodiments of the present invention, since the optical lens has a reflective layer, and the light exit surface of the optical lens extends upward from the top surface of the support, when the light emitting element emits light, the reflective layer can reflect the light of the light emitting element to the light exit surface sold out. In this way, the direction of light travel can be changed and the travel distance of light from the light emitting element to the light exit surface of the optical lens can be increased to increase the focal length, so as to obtain a better projection effect and effectively reduce the total height of the projection device, which is advantageous for thin design .

100, 100a, 100b‧‧‧Projection device

110‧‧‧ substrate

120‧‧‧Support

122‧‧‧Top

130‧‧‧Lighting element

140‧‧‧Optical lens

142‧‧‧Reflective layer

144‧‧‧Glossy

145‧‧‧ edge

146‧‧‧Convex

147‧‧‧diffractive optical element

148‧‧‧Bottom

150‧‧‧Colloid

152‧‧‧Second colloid

160‧‧‧Cover

162‧‧‧Concave

164‧‧‧Top

170‧‧‧Reflecting mirror

210‧‧‧ nozzle

D1‧‧‧First direction

D2‧‧‧Second direction

A‧‧‧ First distance

B‧‧‧Second distance

D1‧‧‧First direction

D2‧‧‧Second direction

L‧‧‧Light

S‧‧‧accommodation space

2-2‧‧‧ line

FIG. 1 is a top view of a projection device that changes the direction of light travel according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a projection device that changes the light traveling direction along line 2-2 of FIG. 1. FIG.

FIG. 3 is a cross-sectional view of a projection device that changes the direction of light travel according to another embodiment of the present invention.

4 is a cross-sectional view of a projection device that changes the direction of light travel according to another embodiment of the present invention.

In the following, a plurality of embodiments of the present invention will be disclosed in the form of diagrams. For clear description, many practical details will be described together in the following description. Ran However, it should be understood that these practical details should not be used to limit the new model. That is to say, in some embodiments of the new model, these practical details are unnecessary. In addition, in order to simplify the drawings, some conventional structures and elements will be shown in a simple schematic manner in the drawings.

FIG. 1 is a top view of a projection device 100 that changes the direction of light travel according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the projection device 100 that changes the light traveling direction along line 2-2 of FIG. Referring to FIGS. 1 and 2 at the same time, the projection device 100 includes a substrate 110, a support 120, a light emitting element 130 and an optical lens 140. The support 120 is disposed on the substrate 110. The light emitting element 130 is disposed on the substrate 110 and surrounded by the support 120. In other words, the supporting member 120 surrounds the accommodating space S, and the light emitting element 130 is located in the accommodating space S. In some embodiments, the light emitting element 130 may be connected to the substrate 110 through wires through wire bonding.

The optical lens 140 is disposed on the top surface 122 of the support 120 and covers the light emitting element 130. The optical lens 140 has a reflective layer 142, an adjacent light exit surface 144, a convex surface 146, and a bottom surface 148. The reflective layer 142 is located on the convex surface 146 and above the light emitting element 130. The reflective layer 142 is configured to reflect the light L of the light emitting element 130 to the light exit surface 144 to emit light. That is, the reflective layer 142 at least partially covers the light emitting element 130, so that the light L of the light emitting element 130 can be reflected by the reflective layer 142 out of the light surface 144 to emit light. In addition, the light exit surface 144 of the optical lens 140 extends upward from the top surface 122 of the support 120. The bottom surface 148 of the optical lens 140 faces the light emitting element 130 and is a light incident surface. The light exit surface 144 of the optical lens 140 is substantially perpendicular to the bottom surface 148 (light entrance surface).

When the light emitting element 130 emits light L, the reflective layer 142 may emit light The light L of the optical element 130 is reflected to the light exit surface 144 to emit light. In this way, the direction of light travel can be changed and the travel distance of light from the light emitting element 130 to the light exit surface 144 of the optical lens 140 can be increased to increase the focal length, thereby obtaining a better projection effect and effectively reducing the total height of the projection device 100, Favorable thin design.

In this embodiment, the reflective layer 142 reflects the light L from the light emitting element 130 in the first direction D1, and causes the reflected light L to pass through the light exit surface 144 in the second direction D2. The first direction D1 may be perpendicular to the second direction D2, but it is not used to limit the present invention. There is a first distance A (focus distance A) between the light emitting element 130 and the reflective layer 142, and a second distance B (focus distance B) between the reflective layer 142 and the light exit surface 144. The path length (length of focal length) before the light L of the light emitting element 130 exits the light exit surface 144 is the sum of the first distance A and the second distance B. In this way, the transmitted light L is reflected by the reflective layer 142 on the convex surface 146 and passes through the light exit surface 144, which can achieve the effect of increasing the length of the optical path (extending the focal length), so that the light L is projected at the desired position without adding support The height of the piece 120.

In some embodiments, after the light L is emitted through the light exit surface 144 of the optical lens 140, spot light can be projected on the human face, and the spot light irradiated on the human face can be detected by the receiving end for face recognition, but It is not intended to limit this new type.

In this embodiment, the reflective layer 142 can be directly formed on the convex surface 146 by coating. That is, the reflective layer 142 may directly contact the convex surface 146 and extend along the convex surface 146. In addition, the reflective layer 142 may extend from the top surface 122 of the support 120 to the edge 145 of the light exit surface 144 to cover the entire convex surface 146, but it is not intended to limit the present invention. The material of the reflective layer 142 may be a metal material, such as silver (Ag), platinum (Pt), or other suitable metals or composite gold It is a layer to improve the metal reflectivity. .

In this embodiment, the projection device 100 further includes a first colloid 150 and a second colloid 152. The first glue 150 is disposed between the substrate 110 and the support 120 to help the support 120 to be attached to the substrate 110. The second colloid 152 is disposed between the support 120 and the optical lens 140, which helps the optical lens 140 to be attached to the support 120.

In this embodiment, the material of the substrate 110 may be ceramic. The material of the support 120 may be liquid crystal polymer (Liquid Crystal Polymer; LCP), or the material of the support 120 may be nylon (Nylon), which facilitates the adhesion between the support 120 and the substrate 110.

In addition, the light emitting element 130 may be a laser light emitting element, such as a vertical cavity surface emitting laser (Vertical-Cavity Surface-Emitting Laser; VCSEL), which has lower energy consumption, longer life, smaller size and more Quick switch.

The light exit surface 144 of the optical lens 140 has a diffractive optical element 147 (Diffractive Optical Element; DOE), so that the light L forms a plurality of diffraction patterns after passing through the diffractive optical element 147 of the light exit surface 144. Further, when the aforementioned diffraction pattern is projected on the surface of the object to be detected with surface relief, a plurality of optical patterns with specific geometric shapes and distribution relationships can be formed, which can provide subsequent image analysis. For example, the light L passing through the diffractive optical element 147 of the light exit surface 144 can be projected on the object to be detected 1 meter away.

FIG. 3 is a cross-sectional view of a projection device 100a that changes the direction of light travel according to another embodiment of the present invention. As shown, the projection device 100a includes a substrate 110, a support 120, a light emitting element 130, and an optical lens 140. With the first The difference between the projection device 100 in FIG. 2 is that the projection device 100a further includes an upper cover 160. Since the substrate 110, the supporting member 120, the light-emitting element 130, and the optical lens 140 of the projection device 100a are similar to the components of the projection device 100 of FIG. 2, they are not repeated here for the sake of simplicity, and will be described first.

The upper cover 160 is disposed on the optical lens 140. The upper cover 160 has a concave surface 162, and the concave surface 162 of the upper cover 160 is coupled to the convex surface 146 of the optical lens 140. That is, the concave surface 162 of the upper cover 160 is conformally disposed on the convex surface 146 of the optical lens 140. In addition, the reflective layer 142 is located between the concave surface 162 of the upper cover 160 and the convex surface 146 of the optical lens 140. In addition, the upper cover 160 has a top surface 164 facing away from the concave surface 162, and the top surface 164 is a flat surface, and is configured to be sucked by the suction nozzle 210. During assembly, the arrangement of the upper cover 160 allows the suction nozzle 210 to be easily attracted to the flat top surface 164 of the upper cover 160 to facilitate moving the projection device 100a.

In some embodiments, the material of the upper cover 160 may be a glass material. Alternatively, the material of the upper cover 160 may be a synthetic resin, such as polyethylene terephthalate (PET). The upper cover 160 may be transparent or opaque, and is not intended to limit the present invention.

FIG. 4 is a cross-sectional view of a projection device 100b that changes the direction of light travel according to another embodiment of the present invention. As shown, the projection device 100b includes a substrate 110, a support 120, a light emitting element 130, and an optical lens 140. The difference from the projection device 100 in FIG. 2 is that the projection device 100b further includes a mirror 170. Since the substrate 110, the supporting member 120, the light-emitting element 130, and the optical lens 140 of the projection device 100b are similar to the components of the projection device 100 of FIG. 2, they are not repeated here for the sake of simplicity, and will be described first.

As shown in FIG. 4, the mirror 170 is located outside the optical lens 140, And toward the light exit surface 144 of the optical lens 140. In detail, the light emitting element 130 emits light L along the first direction D1. After the light L reaches the reflective layer 142, the light L is reflected by the reflective layer 142 and passes through the light exit surface 144 along the second direction D2. Then, the light L reaches the reflecting mirror 170 and is reflected by the reflecting mirror 170 to illuminate an object (such as a human face).

Although the present invention has been disclosed as above by way of implementation, it is not intended to limit the present invention. Anyone who is familiar with this skill can make various modifications and retouching without departing from the spirit and scope of the present invention, so the protection of the present invention The scope shall be as defined in the appended patent application scope.

100‧‧‧Projection device

110‧‧‧ substrate

120‧‧‧Support

122‧‧‧Top

130‧‧‧Lighting element

140‧‧‧Optical lens

142‧‧‧Reflective layer

144‧‧‧Glossy

145‧‧‧ edge

146‧‧‧Convex

147‧‧‧diffractive optical element

148‧‧‧Bottom

150‧‧‧Colloid

152‧‧‧Second colloid

A‧‧‧ First distance

B‧‧‧Second distance

D1‧‧‧First direction

D2‧‧‧Second direction

L‧‧‧Light

S‧‧‧accommodation space

Claims (10)

A point-shaped projection device that changes the direction of light travel, including: A substrate A support member, arranged on the substrate; A light emitting element disposed on the substrate and surrounded by the support; and An optical lens is disposed on a top surface of the support and covers the light emitting element. The optical lens has a reflective layer, an adjacent light exit surface and a convex surface, the reflective layer is located on the convex surface, and the light exit surface Extending upward from the top surface of the support, the reflective layer is located above the light emitting element, and the reflective layer is configured to reflect one of the light rays of the light emitting element to the light exit surface to emit light. The point projection device for changing the traveling direction of light according to claim 1, wherein the reflective layer is configured to reflect the light from the light emitting element in a first direction to reflect in a second direction through the light exit surface, wherein the first One direction is perpendicular to the second direction. The point-shaped projection device for changing the traveling direction of light according to claim 1, wherein there is a first distance between the light-emitting element and the reflective layer, and there is a second distance between the reflective layer and the light-emitting surface. The path length before the light exits the light exit surface is the sum of the first distance and the second distance. The point projection device for changing the traveling direction of light according to claim 1, wherein the light exit surface of the optical lens has a diffractive optical element. The point-shaped projection device for changing the traveling direction of light as described in claim 1, wherein the reflective layer extends from the top surface of the support to the edge of the light exit surface. The point projection device for changing the traveling direction of light as described in claim 1, wherein the light emitting element is a vertical cavity surface emitting laser (VCSEL). The point projection device for changing the traveling direction of light as described in claim 1 further includes: An upper cover is arranged on the optical lens and has a concave surface, and the concave surface is coupled with the convex surface of the optical lens. According to the point projection device for changing the traveling direction of light as described in claim 7, the reflective layer is located between the concave surface of the upper cover and the convex surface of the optical lens. The point-shaped projection device for changing the traveling direction of light according to claim 7, wherein the upper cover has a top surface facing away from the concave surface, and the top surface is a flat surface, configured to be attracted by a suction nozzle. The point projection device for changing the traveling direction of light as described in claim 1 further includes: A reflecting mirror is located outside the optical lens and faces the light exit surface of the optical lens.

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