Three-dimensional printing apparatus

Abstract

A three-dimensional printing apparatus is provided, including a container, a display, a control unit and an optical film. The container contains a photosensitive material. The display has a plurality of display units. Each of the display units is capable of emitting a light beam. The control unit is capable of controlling the display units. The optical film is capable of projecting the light beams emitted from the display units onto the photosensitive material, forming a plurality of projected patterns. An arranging sequence and an arranging direction of the projected patterns are substantially the same as an arranging sequence and an arranging direction of the display units.

Description

CROSS-REFERENCE TO RELATED APPLICATION

This application Referring again to FIG. 1A to FIG. 1C, in some embodiments, an optical assembly configured for the three-dimensional printing apparatus 100 can be formed by including the container 110 and the display 120 therein.

It is noted that, in the three-dimensional printing apparatus 100 of the embodiment, the image displayed on the display 120 is divided into multiple display units 122 for displaying, and the light beams L of the display units 122 corresponding to the image are projected onto the photosensitive material 112 to form the projected patterns through the optical film 130 in the one-to-one manner. The arranging sequence and the arranging direction of the projected patterns on the photosensitive material 112 are substantially the same as the arranging sequence and the arranging direction of the display units 122 on the display 120. In the present embodiment, a projection system configured for the three-dimensional printing apparatus 100 can be formed by including the container 110 and the display 120 comprising the display units 122 therein. Comparatively, a conventional three-dimensional device with the projection lens projects the image of the display 120 by using whole surface image-forming method via the projection lens, forming the image on the photosensitive material 112. Based on the image-forming principle, the image formed on the photosensitive material 112 is a 180 degree reversed image. Therefore, design of an image-forming distance is necessary in order to meet the image-forming requirement, thereby increasing the size of the printing device.

In the embodiment, the image displayed on the display 120 is divided into multiple display units 122, and the light beams L of the display units 122 of the display 120 corresponding to the image are projected on the photosensitive material 112 to form the projected patterns through the optical film 130 in the one-to-one manner. Since a size of each display unit 122 is smaller than the entire image, the projecting distance between the display units 122 and the photosensitive material 112 may be reduced. As a result, a required distance between the display 120 and the photosensitive material 112 may be reduced, and the size of the three-dimensional printing apparatus 100 may also be reduced. For example, in the embodiment, a distance between the display 120 and an upper surface 114a of the bottom 114 of the container 110 is less than or equal to 3 cm. On the other hand, the display 120 of the embodiment may be a liquid crystal display. Therefore, a light source of the display 120 provided for projecting may be a visible light. However, an invisible light (such as UV light) source for curing or hardening the photosensitive material 112 may also be used.

Referring to FIG. 1A, in particularly, the three-dimensional apparatus 100 further includes a work platform 140 and a control unit 150. The work platform 140 is dipped into the photosensitive material 112 and capable of moving with respect to the container 110, wherein the work platform 140 has a work surface 140a facing the bottom 114 of the container 110. The control unit 150 is coupled with the work platform 140 and the display 120, for controlling the work platform 140 and the display unit 122. In the embodiment, the work platform 140 is capable of relatively moving from top to bottom of the container 110 or from bottom to top of the container 110.

Next, referring to FIG. 1A, FIG. 1B, and FIG. 1C in sequence. In FIG. 1A, the control unit 150 commands the display 120 to display a first image during a first time, and the first image is divided into a plurality of corresponding display units 122, and the work surface 140a is located at a first location (the location as shown in FIG. 1A). Here, the light beams L emitted from the display units 122 corresponding to the first image are projected to a layer of the photosensitive material 112 between the work surface 140a of the work platform 140 and the upper surface 114a of the bottom 114 through the optical film 130, such that a first cured layer S1 is formed by curing the layer of the photosensitive material 112 between the work surface 140a and the upper surface 114a and corresponds to the first image. Next, in FIG. 1B, the work surface 140a moves to be located at a second location (the location as shown in FIG. 1B) by the control unit 150 during a second time. Here, the photosensitive material 112 in the container 110 is filled between the first cured layer S1 and the upper surface 114a, the control unit 150 commands the display 120 to display a second image, and the second image is divided into a plurality of corresponding display units 122. The light beams L emitted from the display units 122 corresponding to the second image are projected to a layer of the photosensitive material 112 between the first cured layer S1 and the upper surface 114a through the optical film 130, such that a second cured layer S2 is formed by curing the layer of the photosensitive material 112 between the first cured layer S1 and the upper surface 114a and corresponds to the second image. Subsequently, in FIG. 1C, the work surface 140a moves to be located at a N^th location (the location as shown in FIG. 1C) by the control unit 150. The control unit 150 commands the display 120 to display an N^th image during an N^th time, the N^th image is divided into a plurality of corresponding display units 122. The light beams L corresponding to the N^th image are projected to a layer of the photosensitive material 112 between an N−1^th cured layer SN−1 and the upper surface 114a through the optical film 130, so that an N^th cured layer SN is formed by curing the layer of the photosensitive material 112 between an N−1^th cured layer SN−1 and the upper surface 114a and corresponds to the N^th image. In the embodiment, N, for example, is a positive integer larger than or equal to 3.

Regarding the embodiment, the work surface 140a faces the upper surface 114a of the bottom 114, the second cured layer S2 is located between the first cured layer S1 and the upper surface 114a of the bottom 114, and the first location is located between the bottom 114 and the second location. More specifically, a slicing process may be performed on the three-dimensional object, so as to divide an object into multilayer image data. The control unit 150 commands the corresponding display units 122 to display the first layer image of the object during the first time. Next, the corresponding display units 122 are commanded to display the second layer image of the object during the second time. After repeating said process for a number of times, the images of different layers are sequentially projected to the corresponding layers of photo sensitive material 112 through the optical film 130, so that the corresponding layers of the photosensitive material 112 are cured in respond to each different layer of images, such that a three-dimensional object is formed in a layer-by-layer manner.

In the embodiment, the display 120 is disposed under the bottom 114 of the container 110, so that the light beams L of the display units 122 may be emitted from bottom to top onto the photosensitive material 112 above the upper surface 114a of the bottom 114. However, the invention is not limited thereto. In other embodiments, the display 120 may also be disposed on a top of the container 110 (not illustrated), so that the light beams L of the display units 122 may be emitted from top to bottom onto the photosensitive material 112.

FIG. 2 is a schematic view of the plurality of display units of the display. Referring to FIG. 2, in the three-dimensional printing apparatus 100, the display 120 may be a liquid crystal display panel, and the display unit 122 may include at least one pixel 122a in the liquid crystal display panel. For example, in FIG. 2, the display units 122 are composed by nine pixels 122a. The number of the pixels 122a included in the display units 122 may be adjusted according to the required resolution of the image. On the other hand, the conventional three-dimensional technology usually uses a display with color filter. The three-dimensional printing apparatus 100 according to an embodiment of the invention may use a display 120 without color filter, each of the sub-pixels corresponding to filters of different color in the original display may now be referred to as one single pixel, such that the resolution of the display 120 may be improved, thereby allowing the three-dimensional printing technology in providing a higher resolution.

In the embodiment, the optical film 130 includes a plurality of optical structures 132, for projecting the light beams L emitted from the display unit 122 onto the photosensitive material 112. Several preferable embodiments are provided below to further illustrate the relative relation between the display unit 122 and the optical film 130.

FIG. 3A illustrates a corresponding relationship between the display units of the display and the optical structures of the optical film in a first embodiment of the invention. FIG. 3A is a top view illustrating the overlapping of the display 120 and an optical film 130A, wherein the portion with dotted line surrounded represents the display 120, and the portion with full line surrounded represents the optical film 130A. FIG. 3B is a side view of FIG. 3A.

Referring to FIG. 3A and FIG. 3B together. In the embodiment, the optical film 130A has a plurality of optical structures 132A, wherein each optical structure 132A is a lens (such as lens having bent surface on both two directions that are perpendicular to each other), a size of each optical structure 132A is substantially equal to the size of each display unit 122.

FIG. 4A illustrates a corresponding relationship between the display units of the display and the optical structures of the optical film in a second embodiment of the invention. FIG. 4B is a side view of FIG. 4A. Each optical structure 132B of the optical film 130B of the embodiment is similar to the optical structure 132A shown in the FIG. 3A, namely, the lens. However, a size of each optical structure 132B is substantially smaller than the size of the display unit 122.

FIG. 5A illustrates a corresponding relationship between the display units of the display and the optical structures of the optical film in a third embodiment of the invention. FIG. 5B is a side view of FIG. 5A. In the embodiment, each optical structure 132C on the optical film 130C is a cylindrical lens, and a width of each optical structure 132C is substantially equal to the width of the display unit 122.

According to the embodiments in FIG. 3A, FIG. 4A and FIG. 5A, an image of the display units 122 is formed on the photosensitive material 112 through the lens or the cylindrical lens. Therefore, each of the optical structures 132A, 132B and 132C may be adjusted, for aligning with at least one display unit 122. For example, in FIG. 3A, each lens (the optical structure 132A) is aligned with one corresponding display unit 122. In another embodiment, each of the display unit 122 is aligned with a plurality of optical structures. For example, in FIG. 4A, each of the display units 122 is align with four lenses (the optical structures 132B). When one display unit 122 includes a plurality of pixels 122a (referring to FIG. 2), each lens is aligned with the plurality of pixels 122a, and when one display unit 122 includes one pixel 122a, each lens is aligned with one pixel 122a. In other words, in FIG. 3A, the size of each optical structure 132A may be an integral times the size of the pixel 122a of the corresponding display unit 122 (referring to FIG. 2). Whereas in FIG. 4A, the size of each display unit 122 is an integral times the size of the corresponding optical structure 132B. In FIG. 5A, each cylindrical lens (the optical structure 132C) is aligned with a row of display units 122. Since the size of each display unit 122 is smaller than the size of the entire image displayed by the display 120, the image-forming distance for projecting the image of the display units 122 respectively onto the photosensitive material 112 by using the optical structures 132 (such as the plurality of lenses or cylindrical lenses) may be smaller than the image-forming distance for projecting the entire image onto the photosensitive material 112 by using whole surface image-forming method. Therefore, the overall size of the three-dimensional printing apparatus 100 may be effectively reduced.

FIG. 6A illustrates a corresponding relationship between the display units of the display and the optical structures of the optical film in a fourth embodiment of the invention. FIG. 6B is a side view of FIG. 6A. In the embodiment, each optical structure 132D of the optical film 130D is a triangular-shaped prism, and a width of each optical structure 132D is substantially equal to the width of the display unit 122.

FIG. 7A illustrates a corresponding relationship between the display units of the display and the optical structures of the optical film in a fifth embodiment of the invention. FIG. 7B is a side view of FIG. 7A. In the embodiment, each optical structure 132E of the optical film 130E is a pyramidal prism, and a size of each optical structure 132E is equal to the size of each display unit 122.

However, in other embodiments, the size of the triangular-shaped prism or the pyramidal prism may not be an integer times the display unit 122, and the location of the triangular-shaped prism or the pyramidal prism may not have corresponding relationship with the location of the display unit 122, both are also possible.

FIG. 8 illustrates a corresponding relationship between the display units of the display and the optical structures of the optical film in a sixth embodiment of the invention. In the embodiment, the optical film 130F is a diffusing film, and optical structures 132F of the optical film 130F are provided for converging the light beams L, whereas in the other embodiments, the optical film 130F may also be a Fresnel lens or a privacy filter.

In the embodiments of FIG. 6A and FIG. 7A, the method for projecting the display units 122 on the photosensitive material 112 is tended to use a projection method. Therefore, the locations of each triangular-shaped prism (the optical structure 132D) and each pyramidal prism (the optical structure 132E) may not have corresponding relationship with the locations of the display units 122. However, the light beams L emitted from the corresponding display units 122 may be converged onto the photosensitive material 112 (as shown in FIG. 1A, FIG. 1B and FIG. 1C). Similarly, the optical film 130F (such as a Fresnel lens or a privacy filter) shown in FIG. 8 is also capable of converging the light beams L emitted from the display units 122. In addition, when the light beams L emitted from the display 120 are converged more, the light beams L of the display units 122 may still be projected on the photosensitive material 122 (as shown in FIG. 1A, FIG. 1B and FIG. 1C) when the optical film 130F is the diffusing film.

Based on above, the three-dimensional printing apparatus according to the embodiment of the invention projects the display units of the display onto the photosensitive material through the optical film, and the arranging sequence and the arranging direction of the projected patterns are substantially the same as the arranging sequence and arranging direction of the display units. As a result, the distance between the display and the photosensitive material may be reduced, thereby reducing the size of the three-dimensional printing apparatus, and providing good effect of three-dimensional printing.

The foregoing description of the preferred embodiments of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form or to exemplary embodiments disclosed. Accordingly, the foregoing description should be regarded as illustrative rather than restrictive. Obviously, many modifications and variations will be apparent to practitioners skilled in this art. The embodiments are chosen and described in order to best explain the principles of the invention and its best mode practical application, thereby to enable persons skilled in the art to understand the invention for various embodiments and with various modifications as are suited to the particular use or implementation contemplated. It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents in which all terms are meant in their broadest reasonable sense unless otherwise indicated. Therefore, the term “the invention”, “the present invention” or the like does not necessarily limit the claim scope to a specific embodiment, and the reference to particularly preferred exemplary embodiments of the invention does not imply a limitation on the invention, and no such limitation is to be inferred. The invention is limited only by the spirit and scope of the appended claims. The abstract of the disclosure is provided to comply with the rules requiring an abstract, which will allow a searcher to quickly ascertain the subject matter of the technical disclosure of any patent issued from this disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. Any advantages and benefits described may not apply to all embodiments of the invention. It should be appreciated that variations may be made in the embodiments described by persons skilled in the art without departing from the scope of the present invention as defined by the following claims. Moreover, no element and component in the present disclosure is intended to be dedicated to the public regardless of whether the element or component is explicitly recited in the following claims. In addition, the terms such as “first”, “second” as recited in the specification or the claims are used to give the elements names or distinguish different embodiments or scopes, but not to limit the maximum number or the minimum number of the elements.

Claims

31. A projection system for a three-dimensional printing apparatus, comprising:

a display, comprising a plurality of display units; and

a container disposed above the display and comprising a light-transparent bottom being configured to accommodate a photosensitive material, wherein the light-transparent bottom of the container has an upper surface facing the photosensitive material,

wherein each of the display units is capable of emitting light beams to the light-transparent bottom, and a distance between the display and of the upper surface of the transparent bottom of the container is less than or equal to 3 cm.