CN100397239C - Projection lens assembly and vibration device thereof - Google Patents

Abstract

The invention relates to a projection lens group and a vibration device thereof. The vibration device comprises a light reflection element, a supporting element, a base, at least one magnetic element and at least one coil loop. Wherein, the light reflection element is arranged on the supporting element; at least one supporting element is vertically arranged on one surface of the base, and the supporting element supports the holding element and the light reflecting element; the magnetic element is arranged on the base and is adjacent to one side of the light reflection element, and the magnetic element has a first polarity and a second polarity; the coil loop is wound around the side of the light reflecting element relative to the magnetic element, and when the current direction of the coil loop is changed, an attractive magnetic force and a repulsive magnetic force are formed between the light reflecting element and the magnetic element, so that the light reflecting element vibrates. The vibration of the light reflecting element makes the light path shift, and the visual persistence is utilized to eliminate the discontinuous picture caused by the gap on the digital micromirror wafer in the projection system, so that the method is more practical.

Description

Projection lens group and its vibration device

technical field

The invention relates to a projection lens group and its vibrating device, in particular to a projection lens group and its vibrating device used in an image projection system.

Background technique

Under the multiple demands of large display area, miniaturization and lightweight system, image projection system has become one of the most popular sub-items in the optoelectronic industry.

According to the principle of projection, the projection system can be divided into three major types, which are liquid crystal projection system (Liquid Crystal Display, LCD), single crystal silicon liquid crystal projection system (Liquid Crystal on Silicon, LCOS) and digital light source processor projection system. (Digital Light Processing, DLP), among them, DLP has become one of the new generation of popular projection systems due to its advantages of high brightness, accurate tone reproduction, fast response time, no noise, and light and small.

Please refer to FIG. 1 , which is a schematic diagram showing a conventional digital light source processor projection system. The existing known DLP projection system 1 adopts digital control and utilizes the principle of reflected light to gather the light from a light source 11 and focus it through a lens 12, and then pass through a color filter of red, green and blue. After the chip 13, it is projected onto a digital micro-mirror chip (Digital Micro-mirror Device, DMD) 14. There are many tiny movable mirrors on the digital micro-mirror chip 14, and the tilt angle and deflection time of the movable mirror are controlled by the driving electrodes to switch The light is reflected into a projection lens group 15, and the projection lens group 15 generally includes a plurality of lenses, which are usually combined with a reflector 151 to turn the light, and the light path is changed by the reflector 151 to allow the light to be enlarged and projected through the lens to a screen 16 for imaging.

Among them, the digital micromirror chip 14 is used to replace the liquid crystal panel responsible for presenting images in the traditional liquid crystal projector. It is a very high-precision technology. Please refer to FIG. Schematic diagram of a mirror wafer. This digital micromirror chip 14 is made of CMOS SRAM memory cell 141 and tiny movable mirror 142, and each movable mirror 142 is equivalent to a pixel (Pixel), and each movable mirror 142 can light from two It is reflected in one direction, and the reflection direction depends on the memory unit cell 141 at the bottom of the movable mirror 142. For example, when the memory unit cell 141 is in the “ON” state, the movable mirror 142 will rotate to +12 degrees. The memory cell 141 is in the "OFF" state, and the movable lens 142 will rotate to -12 degrees, and the incident light will be reflected (ON) or leave (OFF) the projection lens group 15 by the change of the rotation angle of the movable lens 142 The light entrance hole of the digital micromirror chip 14 is composed of about 1.3 million movable mirrors 142, each movable mirror 142 has a size of about 17 μm, and the gap between the movable mirrors 142 is about 1.0 μm. However, although the gap between the movable mirrors 142 is very narrow, the gap will be enlarged during projection and display, which will affect the continuity of the picture.

Also, please refer to FIG. 1 and FIG. 3 . FIG. 3 is a schematic view showing a conventional reflecting mirror and a cover plate. In the existing known projection lens group 15, the reflector 151 is fixed on a cover plate 152, and the cover plate 152 is fixed on a lens barrel 153 of the projection lens group 15, so that the reflector 151 is positioned at the lens barrel 153 inside and fixed on it.

In summary, because the existing known reflector 151 is fixed, and the gap of the movable mirror 142 of the digital micromirror chip 14 will affect the continuity of the picture due to projection magnification, how to solve the problem of digital micromirror chip (DMD) ) gaps cause the discontinuity of the projected picture, which is an important issue.

It can be seen that the above-mentioned existing projection lens group obviously still has inconvenience and defects in structure and use, and needs to be further improved urgently. In order to solve the problems existing in the projection lens group, the relevant manufacturers have tried their best to find a solution, but no suitable design has been developed for a long time, and the general products do not have a suitable structure to solve the above problems, which is obvious. It is a problem that relevant industry players are eager to solve.

In view of the above-mentioned defects existing in the existing projection lens group, based on the rich practical experience and professional knowledge engaged in the design and manufacture of such products for many years, and in conjunction with the application of academic theory, the inventor actively researched and innovated, in order to create a new type of structure The projection lens group and its vibrating device which can improve the discontinuity of the picture and further increase the quality of the picture and the fidelity of the image can improve the general existing projection lens group and make it more practical. Through continuous research, design, and after repeated trial samples and improvements, the present invention with practical value is finally created.

Contents of the invention

The purpose of the present invention is to overcome the defects of the existing projection lens group, and provide a projection lens group and its vibration device with a new structure. The technical problem to be solved is to make it possible to improve the discontinuity of the picture, so that Suitable for practical use.

The purpose of the present invention and the solution to its technical problems are achieved by adopting the following technical solutions. According to a vibrating device proposed by the present invention, it includes: a light reflection element; a holding element, the light reflection element is arranged on the holding element; a base, a surface of which is provided with at least one supporting element, The support element supports the holding element and the light reflection element; at least one magnetic element is arranged on the base and adjacent to one side of the light reflection element, and the magnetic element has a first polarity and a second polarity; and at least one coil loop, which is wound around the side of the light reflective element relative to the magnetic element, when the coil loop changes the direction of the current, there is a gap between the light reflective element and the magnetic element An attractive magnetic force and a repulsive magnetic force make the light reflective element vibrate.

The purpose of the present invention and its technical problems can also be further realized by adopting the following technical measures.

In the aforementioned vibrating device, the coil circuit has a coil and a switch circuit.

In the aforementioned vibrating device, the light reflecting element is a mirror, and the magnetic element is a magnet.

The aforementioned vibrating device further includes at least one elastic element disposed under the supporting element.

In the vibration device mentioned above, the vibration frequency of the light reflection element is 60 Hz.

The purpose of the present invention and the solution to its technical problems are also achieved by the following technical solutions. According to the projection lens group proposed by the present invention, it includes: a lens barrel, which has a through hole; and a vibrating device, which includes a light reflection element, a holding element, a base, at least one magnetic element and at least one coil circuit, the light reflecting element is arranged on the holding element, and at least one supporting element is erected on one surface of the base, and the supporting element supports the holding element and the light reflecting element, and the magnetic element is arranged on the base On the seat and adjacent to one side of the light reflection element, the magnetic element has a first polarity and a second polarity, and the coil loop is wound on the side of the light reflection element relative to the magnetic element, When the coil circuit changes the current direction, there is a magnetic attraction force and a magnetic repulsion force between the light reflection element and the magnetic element, so that the light reflection element vibrates, wherein the base is combined with the through hole, so that The light reflection element is located in the lens barrel.

The purpose of the present invention and its technical problems can also be further realized by adopting the following technical measures.

In the aforementioned projection lens group, the coil circuit has a coil and a switch circuit.

In the aforementioned projection lens set, the light reflection element is a lens, and the magnetic element is a magnet.

The aforementioned projection lens group further includes at least one elastic element disposed under the holding element.

In the aforementioned projection lens group, the vibration frequency of the light reflection element is 60 Hz.

Compared with the prior art, the present invention has obvious advantages and beneficial effects. As can be seen from above technical scheme, main technical content of the present invention is as follows:

In order to achieve the above object, the vibrating device according to the present invention includes a light reflection element, a holding element, a base, at least one magnetic element and at least one coil circuit. Wherein, the light reflection element is arranged on the holding element; one surface of the base is erected at least one support element, and the support element is to support the holding element and the light reflection element; the magnetic element is arranged on the base and adjacent to the On one side of the light reflective element, the magnetic element has a first polarity and a second polarity; the coil loop is wound around the side of the light reflective element relative to the magnetic element. When the coil loop changes the current direction, the light reflective element There is an attractive magnetic force and a repulsive magnetic force between the magnetic element and the light reflective element to vibrate.

Furthermore, in order to achieve the above purpose, the projection lens assembly according to the present invention includes a lens barrel and a vibrating device. Wherein, the lens barrel has a through hole; the vibration device includes a light reflection element, a holding element, a base, at least one magnetic element and at least one coil circuit, the light reflection element is arranged on the holding element, and the base One surface is erected with at least one support element, the support element supports the holding element and the light reflection element, the magnetic element is arranged on the base and adjacent to one side of the light reflection element, and the magnetic element has a first pole and a second polarity, the coil loop is wound around the side of the light reflective element relative to the magnetic element, when the coil loop changes the direction of the current, there is a mutual attraction magnetic force and a mutual repulsion magnetic force between the light reflective element and the magnetic element, The light reflection element is vibrated, wherein the base is combined with the through hole, so that the light reflection element is located in the lens barrel.

By means of the above-mentioned technical solution, the projection lens group and its vibrating device of the present invention have at least the following advantages: Based on the above, because the projection lens group and its vibrating device according to the present invention utilize the principle that opposite polarity attracts the same sex and repels each other , when the coil wound around the light reflective element is supplied with current, a magnetic field will be generated and the magnetic field will interact with the magnetic element adjacent to the light reflective element, by changing the direction of the current, the distance between the light reflective element and the magnetic element will be The magnetic force attracts and repels each other and vibrates. The projection lens group including this vibration device is applied to a projection system (such as a DLP projection system). Due to the vibration of the light reflection element, the light path is displaced, and the projection is eliminated by using the persistence of vision. Picture discontinuity caused by gaps on the DMD chip in the system.

To sum up, the projection lens group and its vibration device with special structure of the present invention can improve the discontinuity of the picture, and there is no similar structural design published or used in similar products, so it is indeed innovative, no matter in The product structure or function has been greatly improved, and the technology has made great progress, and has produced useful and practical effects. Compared with the existing projection lens group, it has a number of enhanced functions, so it is more suitable for practical use. And it has wide application value in the industry, and it is a novel, progressive and practical new design.

The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable , the following preferred embodiments are specifically cited below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

FIG. 1 is a schematic diagram showing a conventional digital light source processor projection system.

FIG. 2 is a schematic diagram showing a conventional digital micromirror chip.

FIG. 3 is a schematic diagram showing a conventional reflecting mirror and a cover plate.

FIG. 4 is a schematic side view showing a vibration device according to a preferred embodiment of the present invention.

FIG. 5 is a schematic top view showing a vibrating device according to a preferred embodiment of the present invention.

FIG. 6 is a schematic side view showing another vibrating device according to a preferred embodiment of the present invention.

FIG. 7 is a schematic diagram showing a projection lens assembly according to a preferred embodiment of the present invention.

1: DLP projection system 11: Light source

12: Lens 13: Color filter

14: Digital micromirror chip 141: Memory unit cell

142: Movable lens 15: Projection lens group

151: Mirror 152: Cover

153: lens barrel 16: screen

2: Vibration device 20: Light reflection element

21: Holding element 23: Base

231: Supporting element 24: Magnetic element

241: First polarity 242: Second polarity

25: Coil loop 251: Coil

252: Switch circuit 26: Elastic element

3: Projection lens group 31: Lens barrel

311: Through hole

Detailed ways

In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, the specific implementation, structure and characteristics of the projection lens group and its vibrating device according to the present invention will be described below in conjunction with the accompanying drawings and preferred embodiments. Its functions are described in detail below, and the same elements will be described with the same reference symbols.

Please refer to FIG. 4 and FIG. 5 , which are schematic side and top views showing a vibrating device according to a preferred embodiment of the present invention. The vibrating device 2 according to a preferred embodiment of the present invention includes a light reflection element 20, a holding element 21, a base 23, at least one magnetic element 24 and a coil circuit 25, wherein:

The light reflective element 20 is disposed on the supporting element 21 . In this embodiment, the light reflection element 20 is a lens.

A surface of the base 23 is erected with at least one supporting element 231 , and the supporting element 231 supports the supporting element 21 and the light reflecting element 20 .

The magnetic element 24 is arranged on the base 23 and adjacent to one side of the light reflecting element 20 (as shown in FIG. 4 ). In addition, the magnetic element 24 can also be adjacent to the opposite two sides of the light reflecting element 20 On the side (as shown in FIG. 5 ), the magnetic element 24 has a first polarity 241 and a second polarity 242 . In this embodiment, the magnetic element 24 is a magnet. As shown in FIG. 4 , the first polarity 241 can be an N pole, and the second polarity 242 can be an S pole.

The coil loop 25 is wound around the side of the light reflective element 20, and the coil loop 25 is arranged relative to the magnetic element 24. Therefore, the coil loop 25 can be formed on one side of the light reflective element 20 (as shown in FIG. 4 shown), or formed on opposite sides of the light reflection element 20 (as shown in FIG. 5 ), in this embodiment, the coil loop 25 has a coil 251 and a switch loop 252, when the switch loop 252 controls the coil When 251 changes the direction of the current, there is an attractive magnetic force and a repulsive magnetic force between the light reflective element 20 and the magnetic element 24, so that the light reflective element 20 vibrates (as shown by the arrow in FIG. 4 ). In this embodiment, the vibration frequency of the light reflective element 20 is 60 Hz.

In addition, please refer to FIG. 6 , which is a schematic side view showing another vibrating device according to a preferred embodiment of the present invention. The vibrating device 2 of this embodiment further includes at least one elastic element 26 disposed under the supporting element 21 to provide a restoring force for the light reflecting element 20 to tilt in one direction when vibrating. In this embodiment, the elastic element 26 is a reed.

Also, please refer to FIG. 7 , which is a schematic diagram showing a projection lens group according to a preferred embodiment of the present invention. The projection lens group 3 according to a preferred embodiment of the present invention includes a lens barrel 31 and a vibrating device 2, wherein:

The lens barrel 31 has a through hole 311;

The vibration device 2 includes a light reflection element 20 , a holding element 21 , a base 23 , at least one magnetic element 24 and at least one coil loop 25 . Wherein, the base 23 is combined with the through hole 311 of the lens barrel 31 , so that the light reflection element 20 is located in the lens barrel 31 .

The vibrating device 2 of the projection lens set 3 further includes at least one elastic element 26 . In this embodiment, the light reflecting element 20 is a lens; the magnetic element 24 is a magnet; and the elastic element 26 is a reed.

In this embodiment, the component structure, arrangement and action of the vibrating device 2 are as described above, so details will not be repeated here.

In order to make the present invention easier to understand, please refer to FIG. 4 below to describe the operation mode of the vibrating device 2 according to the preferred embodiment of the present invention.

The light reflection element 20 is disposed on the holding element 21 , and the supporting element 231 of the base 23 supports the holding element 21 and the light reflection element 20 .

As shown in FIG. 4 , at least one side of the light reflecting element 20 is wound with a coil loop 25 , and the coil loop 25 can be wound in an 8-shape, since the magnetic element 24 on the base 23 is opposite to the coil loop 25 However, when the coil loop 25 is supplied with current in one direction, different magnetic poles will be generated at both ends of the coil loop 25, and the light reflecting element 20 will be inclined toward a first direction ( As shown in the solid line arrow in Figure 4), on the contrary, when the coil loop 25 is passed with current in the other direction, the two ends of the coil loop will change the magnetic poles, and similarly utilize the principle of opposite sex attraction and same sex repulsion, so that the light reflection element 20 Tilt toward a second direction (as shown by the dotted arrow in FIG. 4 ), thereby forming a way of vibrating left and right.

In addition, the elastic element 26 (as shown in FIG. 6 ) under the supporting element 21 can further provide a restoring elastic force to the vibrating light reflecting element 20 .

Based on the above, the projection lens group and its vibrating device according to the preferred embodiment of the present invention use the magnetic field generated by the coil loop to interact with the magnetic element to vibrate the optical element, and the vibration device is used in the projection lens group When it is applied to a projection system (such as a DLP projection system), the optical path of the reflected light can be displaced by the vibrating device, which effectively improves the movable mirror gap of the digital micromirror chip (DMD) in the projection system. The resulting image discontinuity.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this field Those skilled in the art, without departing from the scope of the technical solution of the present invention, may use the structure and technical content disclosed above to make some changes or modifications to equivalent embodiments with equivalent changes, but any content that does not depart from the technical solution of the present invention, Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solutions of the present invention.

Claims (10)

1. A vibration device for projection lens group, characterized in that it comprises: a light reflective element; a holding element, the light reflecting element is arranged on the holding element; A base, one surface of which is erected with at least one supporting element, and the supporting element supports the holding element and the light reflecting element; at least one magnetic element, which is disposed on the base and adjacent to one side of the light reflection element, the magnetic element has a first polarity and a second polarity; and At least one coil loop is wound around the side of the light reflective element relative to the magnetic element. When the coil loop changes the current direction, there is a magnetic attraction force and a magnetic repulsion force between the light reflective element and the magnetic element , so that the light reflective element vibrates. 2. The vibrating device for the projection lens group according to claim 1, wherein the coil circuit has a coil and a switch circuit. 3. The vibrating device for the projection lens group according to claim 1, wherein the light reflecting element is a mirror, and the magnetic element is a magnet. 4. The vibrating device for the projection lens group according to claim 1, further comprising at least one elastic element disposed under the holding element. 5. The vibrating device for the projection lens group according to claim 1, wherein the vibration frequency of the light reflecting element is 60 Hz. 6. A projection lens group, characterized in that it comprises: a lens barrel having a through hole; and A vibration device, which includes a light reflection element, a holding element, a base, at least one magnetic element and at least one coil loop, the light reflection element is arranged on the holding element, and a surface of the base is erected At least one supporting element, the supporting element supports the holding element and the light reflecting element, the magnetic element is arranged on the base and adjacent to one side of the light reflecting element, the magnetic element has a first polarity and a second polarity, the coil loop is wound on the side of the light reflective element relative to the magnetic element, when the coil loop changes the current direction, there is an attraction between the light reflective element and the magnetic element The magnetic force and a repulsive magnetic force cause the light reflection element to vibrate, wherein the base is combined with the through hole so that the light reflection element is located in the lens barrel. 7. The projection lens set according to claim 6, wherein the coil circuit has a coil and a switch circuit. 8. The projection lens set according to claim 6, wherein the light reflecting element is a mirror, and the magnetic element is a magnet. 9. The projection lens assembly according to claim 6, further comprising at least one elastic element disposed under the holding element. 10. The projection lens assembly according to claim 6, wherein the vibration frequency of the light reflection element is 60 Hz.

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