TWI556053B - Optical module for an optical projection apparatus - Google Patents

Description

Optical module for use on a projection device

The invention relates to an optical module, in particular to an optical module for use on a projection device.

One of the features of the projector is that it does not require a fixed screen, so it is not limited by the size of the screen. As long as there is a plane for projecting images, a large size image can be easily projected. Therefore, it has been widely applied to various fields, such as a large-scale conference presentation with a projector to enlarge a picture to be projected, or applied to a home theater group.

In general, a common projection system is provided with a filter in front of the light source, which filters out the unnecessary invisible light, then separates the color through the filter structure of the color wheel, and then sends it to other optical components for projection. However, today's light sources are getting brighter and brighter, and the light source is filtered through the filter unless the necessary invisible light is projected and projected, and the projected image often flickers.

Therefore, how to propose a flicker problem caused by avoiding an image projected by a projector having a high-intensity light source has become an important subject to be solved by those skilled in the art.

In view of the above problems, the present invention provides an optical filter capable of forming a diffused light source having a predetermined angle, whereby the light source generated by the light source module of the projector can be diffused when it is irradiated on the optical filter. To overcome the problem of flickering on the screen projected by the projector.

In order to achieve the above object, an embodiment of the present invention provides an optical module for a projection device, which includes an optical filter and a light source module. The optical filter is disposed at a predetermined position, and the optical filter comprises a light transmissive substrate and an optical unit having an optical microstructure layer thereon. The light source module includes a light emitting unit, wherein the light emitting unit is configured to generate a projection light source directly irradiated on the predetermined position. Wherein the projection light source passes through the optical filter to form a diffusion light source having a predetermined angle.

The beneficial effects of the present invention may be that the optical module for the projection device provided by the embodiment of the present invention can diffuse the projection light source generated by the projector by the optical microstructure layer on the optical filter to prevent The flicker problem caused by the projected image of the projection system. At the same time, the ultraviolet filter film and the infrared filter film included in the optical unit on the optical filter will destroy the ultraviolet light of the liquid crystal molecules in the light valve of the projection system and the embrittlement plastic optical component, and generate high heat inside the projection system. Infrared light filtering that results in reduced optical component efficiency and lifetime.

For a better understanding of the features and technical aspects of the present invention, reference should be made to the accompanying drawings.

N‧‧‧ optical module

1‧‧‧Optical filter

11‧‧‧Light transmissive substrate

111‧‧‧ first surface

112‧‧‧ second surface

12‧‧‧Optical microstructure layer

13‧‧‧ Optical unit

131‧‧‧First optical layer

132‧‧‧Second optical layer

133‧‧‧ Third optical layer

2‧‧‧Light source module

21‧‧‧Lighting unit

22‧‧‧ pedestal

P‧‧‧projection light source

D‧‧‧Diffuse light source

Θ‧‧‧predetermined angle

A‧‧‧predetermined location

1A is a schematic view showing the projection of a light source according to a first embodiment of the optical module of the present invention.

FIG. 1B is a schematic diagram of a light source module according to a first embodiment of an optical module of the present invention.

2A is a perspective view of one of the first embodiments of the optical module of the present invention.

2B is a front elevational view of the first embodiment of the optical module of the present invention.

2C is another front perspective view of the first embodiment of the optical module of the present invention.

3 is a front elevational view of a second embodiment of the optical module of the present invention.

4 is a front elevational view of a third embodiment of an optical module of the present invention.

Figure 5 is a front elevational view of a fourth embodiment of the optical module of the present invention.

The following is a description of the present invention by way of a specific example. Other embodiments of the present invention will be readily appreciated by those skilled in the art from this disclosure. The present invention may be embodied or applied in various other specific embodiments, and various modifications and changes can be made without departing from the spirit and scope of the invention. Further, the drawings of the present invention are merely illustrative, and are not depicted in actual dimensions, that is, the actual dimensions of the related structures are not reflected, which will be described first. The following embodiments are intended to further explain the related art of the present invention, but are not intended to limit the technical scope of the present invention.

[First Embodiment]

1A to FIG. 1B, FIG. 1A is a schematic diagram of a light source projection of a first embodiment of an optical module according to the present invention, and FIG. 1B is a schematic diagram of a light source module according to a first embodiment of the optical module of the present invention. The first embodiment of the present invention provides an optical module N for a projection device, which includes an optical filter 1 and a light source module 2. The optical filter 1 can be disposed at a predetermined position A. For example, the predetermined position A can be located on the base 22 of the light source module 2, but the invention is not limited thereto. The optical filter 1 can include a transparent substrate 11 and an optical unit 13 . The transparent substrate 11 has an optical microstructure layer 12 . Specifically, the transparent substrate 11 can be made of glass or glass. It may be selected from systems such as citrate, phosphate, borate and citrate, but the invention is not limited thereto. Next, the light source module 2 can include a light emitting unit 21 for generating a projection light source P directly irradiated on the predetermined position A. In the present invention, the projection light source P generated by the light emitting unit 21 can be An illuminating light source of a laser projector is produced. Thereby, the projection light source P passes through the optical filter 1 to form a diffusion light source D having a predetermined angle θ.

2A to 2B, FIG. 2A is a perspective view of a first embodiment of an optical module according to the present invention, and FIG. 2B is a front view of the first embodiment of the optical module of the present invention. For example, in the first embodiment of the present invention, the optical microstructure layer 12 disposed on the transparent substrate 11 can be polished, cast, printed, etched, sandblasted, atomized, and molded. Protruding, concave, concave, The optical microstructure layer 12 of various shapes, such as a granular or atomized surface, is not limited thereto.

In the above, the transparent substrate 11 can have a first surface 111 and a second surface 112. In detail, the first surface 111 and the second surface 112 can respectively be the lower surface and the upper surface of the transparent substrate 11. The first surface 111 is disposed in a direction facing the light source module 2. Further, the optical unit 13 may further include a first optical layer 131 and a second optical layer 132, and the light source module is changed by the first optical layer 131 and the second optical layer 132 disposed on the transparent substrate 11. The light source characteristics of the projection light source P irradiated on the light-transmitting substrate 11. Further, in the first embodiment of the present invention, the first optical layer 131 may be an infrared filter (IR filter), and the second optical layer 132 may be an ultraviolet filter (Ultraviolet filter, UV filter). For example, the material of the ultraviolet light reflecting film is, for example, a mixed material of titanium oxide (TiO ₂ ) and cerium oxide (SiO ₂ ).

The first optical layer 131 can be disposed on the first surface 111 of the transparent substrate 11 , the second optical layer 132 can be disposed on the first optical layer 131 , and the optical microstructure layer 12 can be disposed on the transparent substrate 11 . The second surface 112, whereby the projection light source P sequentially passes through the second optical layer 132, the first optical layer 131, the transparent substrate 11 and the optical microstructure layer 12 to form a diffusion light source D. Not limited to this. Specifically, the ultraviolet filter film and the infrared filter film can be filtered out before the light source that leads to an increase in temperature of the light source is injected into the projection device, thereby improving the life of the light source module 2.

Further, the projection light source P passes through the optical filter 1, and a diffusion light source D having a predetermined angle θ is formed, and the predetermined angle θ may be between 0 and 75 degrees. Thereby, the optical microstructure layer 12 formed by adjusting grinding, casting, printing, etching, sand blasting, atomization and mold pressing to control the predetermined angle θ of the diffusion light source D can prevent the projection system from being projected. The flicker problem caused by the picture. For example, when the angle of the predetermined angle θ through which the projection light source P passes is larger, the brightness of the formed diffusion light source D can be lowered to avoid the projection of the projected image. The problem of flickering. It is worth mentioning that since the optical microstructure layer 12 is directly formed on the light-transmitting substrate 11 by means of grinding, casting, printing, etching, sand blasting, atomization and mold pressing, thereby, the optical microstructure The material of the layer 12 is the same as that of the light-transmitting substrate 11, so that it can have excellent heat resistance properties, and thus can be applied to high-energy (40-50 watts, or higher wattage) light sources, such as laser projectors, including mines. A device that emits a diode source or such a high-energy source. In addition, it should be noted that the projection light source P passes through the optical filter 1, and a diffusion light source D having a predetermined angle θ is formed, and the predetermined angle θ can be controlled by controlling the roughness of the optical microstructure 12.

Further, referring to FIG. 2C, FIG. 2C is another front view of the first embodiment of the optical module of the present invention. A third optical layer 133 may be further disposed on the optical unit 13. Specifically, the third optical layer 133 may be an anti-reflective film (AR). For example, the material of the anti-reflective film may be, for example, Includes magnesium fluoride (MgF ₂ ) or cryolite (Na ₃ AlF ₆ ). Therefore, the projection light source P generated by the light source module 2 sequentially passes through the third optical layer 133, the second optical layer 132, the first optical layer 131, the transparent substrate 11 and the optical microstructure layer 12 to form a A diffused light source D of a predetermined angle θ. That is, the light source generated by the light source module 2 sequentially passes through the anti-reflection film, the ultraviolet filter film, the infrared filter film, the light-transmitting substrate 11 and the optical microstructure layer 12.

The optical module N for the projection device provided by the first embodiment of the present invention can pass the optical microstructure layer 12 disposed on the transparent substrate 11 to project the projection light source P generated by the light source module 2. A diffusion light source D having a predetermined angle θ is formed. Further, the diffusion light source D can also be made more uniform by the arrangement of the optical microstructure layer 12. In addition, the problem of flicker caused by the projected picture can be avoided by directly replacing the conventional optical filter with the optical filter 1 provided by the invention without having to change other systems. In detail, since the projection device systems of the respective manufacturers are different, the predetermined angle θ of the diffusion light source D can be adjusted to match the projection device systems of various manufacturers, so as to avoid the problem of flicker.

[Second embodiment]

First, please refer to FIG. 3, which is a front view of a second embodiment of the optical module of the present invention. As can be seen from a comparison between FIG. 3 and FIG. 2B, the greatest difference between the second embodiment of the present invention and the first embodiment is that the positions of the first optical layer 131 and the second optical layer 132 can be interchanged. Specifically, the second embodiment of the present invention provides an optical module N for a projection device, which includes an optical filter 1 and a light source module 2. The optical filter 1 can include a transparent substrate 11 and an optical unit 13. The optical unit 13 can also include a first optical layer 131 and a second optical layer 132. The light transmissive substrate 11 can have a first surface 111 and a second surface 112. Thereby, the second optical layer 132 can be disposed on the first surface 111 of the transparent substrate 11, the first optical layer 131 can be disposed on the second optical layer 132, and the optical microstructure layer 12 can be disposed on the transparent substrate On the second surface 112 of the first optical layer 131, the first optical layer 131 can be an infrared filter film, and the second optical layer 132 can be an ultraviolet filter film. The projection light source sequentially passes through the first optical layer 131 and the second optical layer. 132. The light-transmitting substrate 11 and the optical microstructure layer 12 are formed to form a diffusion light source D. Further, the materials of the light-transmitting substrate 11 and the optical unit 13 provided in the second embodiment are the same as those in the first embodiment, and are not described herein again. It is to be noted that the optical module N for the projection device provided by the second embodiment may further be provided with a third optical layer 133, which may further be provided with an anti-reflection film and a third optical layer. The 133 may be disposed on the surface of the first optical layer 131, whereby the projection light source P passes through the third optical layer 133 first, but the invention is not limited thereto.

[Third embodiment]

First, please refer to FIG. 4. FIG. 4 is a front view of a third embodiment of the optical module of the present invention. As can be seen from a comparison between FIG. 4 and FIG. 2B, the greatest difference between the third embodiment of the present invention and the first embodiment is that the optical unit 13 can be disposed on the optical microstructure layer 12. Specifically, a third embodiment of the present invention provides an optical module N for a projection device, wherein the optical microstructure layer 12 is disposed on the second surface 112 of the transparent substrate 11, and the second optical layer 132 The first optical layer 131 is disposed on the second optical layer 132, wherein the first optical layer 131 is disposed on the optical microstructure layer 12. The second optical layer 132 is an ultraviolet filter film, and the projection light source P sequentially passes through the transparent substrate 11, the optical microstructure layer 12, the second optical layer 132, and the first optical layer 131. A diffusion light source D is formed. Further, the materials of the transparent substrate 11 and the optical unit 13 provided in the third embodiment are the same as those in the first embodiment, and are not described herein again. It is to be noted that the optical module N for the projection device provided by the third embodiment may further be provided with a third optical layer 133, that is, an anti-reflection film may be further disposed, the third optical The layer 133 can be disposed on the first surface 111 of the light-transmitting substrate 11, whereby the projection light source P passes through the third optical layer 133 first, but the invention is not limited thereto.

[Fourth embodiment]

First, please refer to FIG. 5. FIG. 5 is a front view of a fourth embodiment of the optical module of the present invention. As can be seen from a comparison between FIG. 5 and FIG. 4, the greatest difference between the fourth embodiment of the present invention and the third embodiment is that the positions of the first optical layer 131 and the second optical layer 132 can be interchanged. Specifically, an optical module N for a projection device according to a fourth embodiment of the present invention, wherein the optical microstructure layer 12 is disposed on the second surface 112 of the transparent substrate 11, the first optical layer The second optical layer 132 can be disposed on the first optical layer 131, wherein the first optical layer 131 is an infrared filter film, and the second optical layer 132 is an ultraviolet filter film. The projection light source P sequentially passes through the transparent substrate 11, the optical microstructure layer 12, the first optical layer 131, and the second optical layer 132 to form the diffusion light source D. It is to be noted that the optical module N for the projection device provided by the fourth embodiment may further be provided with a third optical layer 133, that is, an anti-reflection film may be further disposed, the third optical The layer 133 can be disposed on the first surface 111 of the light-transmitting substrate 11, whereby the projection light source P passes through the third optical layer 133 first, but the invention is not limited thereto.

[Possible effects of the examples]

In summary, the beneficial effects of the present invention may be that the optical module N for the projection device provided by the present invention can pass the optical microstructure layer 12 disposed on the light-transmitting substrate 11 to The projection light source P generated by the module 2 is formed A diffused light source D having a predetermined angle θ, further, the diffused light source D can also be made more uniform by the arrangement of the optical microstructure layer 12. In addition, the ultraviolet filter film and the infrared filter film provided by the second optical layer 132 and the first optical layer 131 disposed on the transparent substrate 11 may also damage the liquid crystal molecules in the light valve of the projection system. The ultraviolet light of the embrittled plastic optical element and the infrared light filtering which causes the heat inside the projection system to reduce the efficiency and life of the optical element.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Therefore, equivalent technical changes made by using the present specification and the contents of the drawings are included in the protection scope of the present invention. .

1‧‧‧Optical filter

11‧‧‧Light transmissive substrate

111‧‧‧ first surface

112‧‧‧ second surface

12‧‧‧Optical microstructure layer

13‧‧‧ Optical unit

Claims (9)

An optical module for a projection device, comprising: an optical filter, the optical filter is disposed at a predetermined position, the optical filter comprises a transparent substrate and an optical unit, The light substrate has an optical microstructure layer; and a light source module, the light source module includes a light emitting unit, wherein the light emitting unit is configured to generate a projection light source directly irradiated at the predetermined position; The projection light source passes through the optical filter to form a diffused light source having a predetermined angle; wherein the predetermined angle is between 0 and 75 degrees. The optical module for use in a projection device according to claim 1, wherein the optical unit is disposed on the light transmissive substrate, and the optical unit comprises an infrared filter film and an ultraviolet filter film. An optical module for use in a projection device according to claim 1, wherein the optical microstructure layer is formed by grinding, casting, printing, etching, sandblasting, atomizing or mold pressing. An optical module for use in a projection apparatus according to claim 1, wherein said light transmissive substrate has said optical microstructure layer in the form of particles. The optical module for use in a projection device of claim 1, wherein the optical unit comprises a first optical layer and a second optical layer, the transparent substrate having a first surface and a second surface. The optical module for use in a projection device according to claim 5, wherein the first optical layer is disposed on the first surface, and the second optical layer is disposed on the first optical layer. The optical microstructure layer is disposed on the second surface, wherein the first optical layer is an infrared filter film, the second optical layer is an ultraviolet filter film, and the projection light source sequentially passes through the a second optical layer, the first optical layer, the light transmissive substrate, and the optical microstructure layer to form the diffusion light source. The optical module for use in a projection device according to claim 5, wherein the second optical layer is disposed on the first surface, and the first optical layer is disposed on the second optical layer. The optical microstructure layer is disposed on the second surface, wherein the first optical layer is an infrared filter film, the second optical layer is an ultraviolet filter film, and the projection light source sequentially passes through the a first optical layer, the second optical layer, the light transmissive substrate, and the optical microstructure layer to form the diffusion light source. The optical module for use in a projection device according to claim 5, wherein the optical microstructure layer is disposed on the second surface, and the second optical layer is disposed on the optical microstructure layer. The first optical layer is disposed on the second optical layer, wherein the first optical layer is an infrared filter film, and the second optical layer is an ultraviolet filter film, and the projection light source sequentially passes through The light transmissive substrate, the optical microstructure layer, the second optical layer, and the first optical layer are formed to form the diffusion light source. The optical module for use in a projection device according to claim 5, wherein the optical microstructure layer is disposed on the second surface, and the first optical layer is disposed on the optical microstructure layer. The second optical layer is disposed on the first optical layer, wherein the first optical layer is an infrared filter film, and the second optical layer is an ultraviolet filter film, and the projection light source sequentially passes through The light transmissive substrate, the optical microstructure layer, the first optical layer, and the second optical layer are formed to form the diffusion light source.