阅读说明：本技术 一种一次成型的多面lcd光源3d打印装置 (One shot forming's multiaspect LCD light source 3D printing device ) 是由 孙慧超 耿浩棒 陈少康 杨家林 吉翔宇 于 2019-11-21 设计创作，主要内容包括：本发明公开了一种一次成型的多面LCD光源3D打印装置,包括支撑框架、光源系统、投影装置和投影装置运动机构,光源系统包括从下到上依次设置的UV光源、凸透镜、菲涅尔透镜、下偏振膜、LCD显示屏和上偏振膜。其中,菲涅尔透镜、下偏振膜、LCD液晶显示屏和上偏振膜形成打印平台,光敏树脂槽设置于打印平台上,LCD显示屏显示打印件三视图信息,需要打印的地方在LCD显示屏上出现选择性的透明区域,其他没有图像显示的区域,紫外光线被阻,光源系统发出的光经整理后通过投影装置将光透射在光敏树脂槽上,实现了把LCD光固化3D打印技术和一次成型的3D打印技术结合的打印技术,把LCD打印的高精度与一次成型的高效率结合起来。(The invention discloses a once-forming multi-surface LCD light source 3D printing device which comprises a supporting frame, a light source system, a projection device and a projection device movement mechanism, wherein the light source system comprises a UV light source, a convex lens, a Fresnel lens, a lower polarization film, an LCD display screen and an upper polarization film which are sequentially arranged from bottom to top. Wherein, fresnel lens, lower polarizing film, LCD liquid crystal display and last polarizing film form print platform, the photosensitive resin groove sets up on print platform, LCD display screen shows the three-view information of printing, the place that needs to print appears selective transparent region on the LCD display screen, other do not have image display's region, ultraviolet light is hindered, the light that light source system sent passes through projection arrangement after the arrangement with light transmission on the photosensitive resin groove, the printing technique that LCD photocuring 3D printing technique and one shot forming's 3D printing technique combined has been realized, combine LCD printing's high accuracy and one shot forming's high efficiency.)

1. A one shot forming multiaspect LCD light source 3D printing device mainly includes: the projection device comprises a supporting frame, a light source system, a projection device and a projection device movement mechanism;

the light source system comprises a UV light source (1), a convex lens (2), a support rod (3), a Fresnel lens (4), a lower polarization membrane (5), an LCD display screen (6) and an upper polarization membrane (7), wherein the Fresnel lens (4), the lower polarization membrane (5), the LCD display screen (6) and the upper polarization membrane (7) are sequentially stacked from bottom to top to form a printing platform, the printing platform is horizontally erected on the ground to the top through a support frame (14), and the polarization angles of the lower polarization membrane (5) and the upper polarization membrane (7) are the same;

the LCD display screen (6) is used for displaying three-view information of a printed piece, a selective transparent area appears on the LCD display screen (6) at the position needing to be printed, and ultraviolet rays are blocked in other areas without image display;

the UV light source (1) is fixedly arranged below the printing platform in a hoisting mode through the supporting rod (3), and the UV light source (1) transmits UV light to the right upper side; a convex lens (2) is arranged on the light path of the light source, and the convex lens (2) is fixed on the support rod (3);

the projection device movement mechanism is fixed on the support frame (14), and the projection device is suspended right above the printing platform through the projection device movement mechanism;

the projection device consists of four triangular reflectors (10), an upper corner sleeve (11) and four lower corner sleeves (9); the four reflectors are spliced into a pyramid reflector array, and the reflecting direction is downward; the upper part of the pyramid-shaped reflector array is fixed through an upper corner sleeve (11), and the lower part of the pyramid-shaped reflector array is fixed through four lower corner sleeves (9); the upper part of the upper corner sleeve (11) is fixedly connected with a projection device movement mechanism, and the projection device is used for projecting vertical upward UV rays to the side surface of a photosensitive resin printing piece on a printing plane.

2. The multi-sided LCD light source 3D printing apparatus as claimed in claim 1, wherein the four mirrors (10) are angled at 45 ° to the horizontal.

3. The multi-surface LCD light source 3D printing device formed in one step as claimed in claim 1, wherein the moving mechanism of the projection device mainly comprises a stepping motor (15), a lead screw (17), a nut (19), a guide rail (18) and a cantilever beam (13); the lead screw (17) is vertically and fixedly installed on the side face of the supporting frame (14) through the upper bearing (20) and the lower bearing (16), the lead screw (17) is connected with an output shaft of the stepping motor (15), a nut (19) is installed on the lead screw (17), the nut (19) is fixedly connected with the cantilever beam (13), the cantilever beam (13) is installed along the horizontal direction, a guide plate is arranged in the vertical direction of the cantilever beam, and the guide plate is matched with a guide rail installed on the supporting frame (14) to play a role in guiding and supporting.

4. The multi-sided LCD light source 3D printing device of claim 1, wherein when the focal length of the convex lens (2) is f, the distance between the LCD display screen (6) and the convex lens (2) is larger than 2f, and the distance between the lower polarizer (5) and the convex lens (2) is larger than f and smaller than 2 f.

Technical Field

The invention belongs to the technical field of 3D printing, and particularly relates to a large-size micro-nano LCD photocuring 3D printing device.

Background

One major branch of the 3D printing technology is the photocuring printing technology, which utilizes the principle that ultraviolet light beams irradiate liquid photosensitive resin to cause photopolymerization and subsequent curing, so that the material is formed by accumulating point by point or layer by layer. Photocuring printing technologies are largely classified into SLA, DLP, and LCD projection technologies. The SLA is called stereo light curing and forming technology, and is formed by irradiating the photosensitive resin with laser beam through fast scanning point by point. The SLA technology is mainly used for molding photosensitive resin materials and has the characteristic of wide application. DLP and LCD projection technology projects the whole layer of image onto photosensitive resin through a projection lens and forms the image layer by superposition.

The DLP projection technology is a photo-curing printing technology developed earlier, and the core component of the DLP projection technology is a digital light processing chip produced by Texas instruments. Since the chip is a proprietary technology of texas instruments, the chip is expensive, especially for high pixels, which limits the development of large-size printing technology. In addition, the difficulty of assembling and debugging the optical system is increased because the chip needs off-axis illumination.

LCD projection technology uses LCD as an image generator, and its printing principle is similar to DLP projection technology. The difference is that the application is extremely wide, and different pixels and different sizes are applied in different fields in the society, so that the variety of the selectable LCDs is wide, and the DLP projection technology is characterized by lower cost.

Another common feature of LCD and DLP projection technologies is that the number of pixels of the image generator determines the size and accuracy of 3D printing, and since the image of the image generator is projected onto the photosensitive resin through the projection lens, the number of pixels of 3D printing is the same as the number of pixels of the image generator, e.g., the printing accuracy is achieved, and a commonly used image generator has a pixel 1280 × 800, and the printing size is 128mm × 80 mm. The high pixel DLP and LCD, especially DLP, are expensive, which limits the application of DLP and LCD projection technology in large-size printing or only reduces the printing precision to realize large-size printing.

Disclosure of Invention

The invention provides a one-step forming multi-surface LCD light source 3D printing device, which is used for solving the problems of low printing speed of the existing LCD, small size and low precision of DLP one-step forming printing, can simultaneously play the advantages of the two and can instantly print a printed piece with higher precision and larger size.

The technical scheme adopted by the invention is as follows:

a one shot forming multiaspect LCD light source 3D printing device mainly includes: the projection device comprises a supporting frame, a light source system, a projection device and a projection device movement mechanism.

The light source system comprises a UV light source 1, a convex lens 2, a support rod 3, a Fresnel lens 4, a lower polarization film 5, an LCD display screen 6 and an upper polarization film 7, wherein the Fresnel lens 4, the lower polarization film 5, the LCD display screen 6 and the upper polarization film 7 are sequentially stacked from bottom to top to form a printing platform, the printing platform is horizontally arranged on the ground to top through a support frame 14, and the polarization angles of the lower polarization film 5 and the upper polarization film 7 are the same;

the LCD display screen 6 is used for displaying three-view information of a printed piece, selective transparent areas appear on the LCD display screen 6 at the positions needing printing, and ultraviolet rays are blocked in other areas without image display;

the UV light source 1 is fixedly arranged below the printing platform in a hoisting mode through a support rod 3, and the UV light source 1 transmits UV light to the right upper side; a convex lens 2 is arranged on the light path of the light source, and the convex lens 2 is fixed on a support rod 3;

the projection device movement mechanism is fixed on the support frame 14, and the projection device is suspended right above the printing platform through the projection device movement mechanism;

the movement mechanism of the projection device mainly comprises a stepping motor 15, a lead screw 17, a nut 19, a guide rail 18 and a cantilever beam 13; the lead screw 17 is vertically and fixedly arranged on the side surface of the supporting frame 14 through an upper bearing 20 and a lower bearing 16, the lead screw 17 is connected with an output shaft of the stepping motor 15, a nut 19 is arranged on the lead screw 17, the nut 19 is fixedly connected with the cantilever beam 13, the cantilever beam 13 is arranged along the horizontal direction, a guide plate is arranged in the vertical direction, and the guide plate is matched with a guide rail arranged on the supporting frame 14 to play a role in guiding and supporting.

The projection device consists of four triangular reflectors 10, an upper corner sleeve 11 and four lower corner sleeves 9; the four reflectors are spliced into a pyramid reflector array, and the reflecting direction is downward; the upper part of the pyramid-shaped reflector array is fixed through an upper corner sleeve 11, and the lower part of the pyramid-shaped reflector array is fixed through four lower corner sleeves 9; the upper part of the upper corner sleeve 11 is fixedly connected with a cantilever beam 13, and the projection device is used for projecting vertical and upward UV rays to the side surface of the photosensitive resin groove 8 on the printing plane.

Preferably, the four reflectors 10 form an angle of 45 ° with the horizontal plane, so that the light emitted from the light source system can be reflected to form horizontal light reflecting information of the object.

When the focal length of the convex lens 2 is f, the distance between the LCD display screen 6 and the convex lens 2 is greater than 2f, and the distance between the lower polarizing film 5 and the convex lens 2 is greater than f and less than 2 f.

The invention has the beneficial effects.

The invention designs an excellent triangular pyramid projection mechanism, and can realize one-step forming with higher precision through a certain light path design.

The invention adopts the LCD display screen to project the product information, and can print the workpiece with larger size compared with the defect of distortion of the existing DLP projection.

The invention only uses one LCD display screen, and has lower cost compared with the three light sources of the existing DLP one-step molding technology.

The invention controls the irradiation direction of the light by controlling the deflection angle of the reflector, has higher precision and is easy to control

Compared with the traditional LCD laser printing technology, the invention realizes the conceptual breakthrough from surface molding to body molding.

Drawings

Fig. 1 is a schematic view of the general structure of the present invention.

FIG. 2 is a schematic view of a projection system according to the present invention.

The labels used in the above figures are as follows: the device comprises a 1-UV light source, a 2-convex lens, a 3-support rod, a 4-Fresnel lens, a 5-lower polarizing film, a 6-LCD display screen, a 7-upper polarizing film, an 8-photosensitive resin groove, 9-four lower corner sleeves, a 10-four-side reflector, an 11-upper corner sleeve, a 12-bolt, a 13-cantilever beam, a 14-support frame, a 15-stepping motor, a 16-lower bearing, a 17-lead screw, an 18-guide rail, a 19-nut, a 20-upper bearing seat and 21-light.

Detailed Description

The technical solution of the present invention is further explained and illustrated below by way of specific examples.