TWI282439B - L-shaped projection lens and optical projection apparatus - Google Patents

Abstract

An optical projection apparatus including a light source, an L-shaped projection lens, and an imaging module is provided. The light source is suitable for providing a light beam projected to a screen to form an image by the L-shaped projection lens. The imaging module is disposed between the light source and the L-shaped projection lens and is arranged on the transmission path of the light beam. In addition, the L-shaped projection lens includes a focus lens system, a zoom lens system, and a mirror, wherein the focus lens system is used to adjust the image definition, and the zoom lens system is used to adjust to the image scaling. The mirror is disposed between the focus lens system and the zoom lens system.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical projection device, and more particularly to an optical projection projection using an L-type projection lens. [Prior Art] - The rear-projection TV mainly uses (4) the engine to generate images, and a projection lens projects the images onto the screen. In order to enable the image of the optical engine to be projected on the screen, the image of the camera is adjusted to the image of the conventional computer. As can be seen from the figure, the rear projection TV; ^ = l type projection lens m, - optical "12G and - Rong screen 13 〇, is a fixed focal projection lens. Please refer to Figure 2, : know, LS projection lens 11G includes 1 set Lens group 112, a = lens group m, and - mirror 116. Between the lens group 112 and the focus lens group μ, the fixed lens group 112 is between the mirror 116 and the glory 130, and the focus lens group m is It is disposed between the mirror 116 and the optical guide (four). Therefore, the image beam generated by the optical engine 120 can be dirtyly projected onto the first screen (10) by the L-shaped lens no. The use of Guan #. _ However, the projection lens of the conventional rear projection TV is a fixed-focus projection mirror, which means that the distance between the projection screen and the imaging is fixed, that is, the same can not be made. The lens is used in rear projection TVs of different specifications, and the projection lens must be re-measured. As a result, it will cost a lot of research and development personnel doc/g 128241 force and cost _ hair * same specifications of the money (four). Therefore, two projection mirrors The rear projection is a miscellaneous, and the projection lens of the sigh is a product that enhances the product. Competition of: reducing the cost of production important key 〃 SUMMARY OF THE INVENTION The present invention - the object is to provide - with species of high compatibility l type projection lens, which can provide power transfer Wei Movies _,.

Optical projection device of the same specification. Another object of the present invention is to provide an optical projection apparatus to which the above-described L-type projection lens is applied. In order to achieve the above object of the present invention, the present invention provides a B-type projection lens adapted to project a beam of light generated into a screen to form an image. The L-shaped projection lens includes a focusing lens group, a zoom lens group, and a mirror, and the towel focusing lens group, the Wei lens group, and the mirror are disposed on the transmission position of the light beam. In addition, the cluster lens is used to adjust the sharpness of the image, the zoom lens group is used to adjust the zoom ratio of the image, and the mirror is located between the focus lens group and the zoom lens group. According to an embodiment of the invention, the focusing lens group is disposed, for example, between the mirror and the screen, and the zoom lens group is disposed, for example, between the mirror and the light source. According to an embodiment of the invention, the zoom lens group is disposed, for example, between the mirror and the screen, and the focus lens group is disposed, for example, between the mirror and the light source. According to an embodiment of the invention, the zoom lens group includes, for example, a 6 1282 m 4 twf.doc/g first through unit, and a second lens unit, wherein the first lens unit and the second lens unit are opposed by Move to adjust the zoom ratio of the image. In order to achieve the above or other objects of the present invention, the present invention further provides an optical projection apparatus comprising an H-L type projection lens in consideration of an imaging mode, and wherein the light source is adapted to provide a light beam, and the L & projection lens is adapted The light beam is projected onto the screen to form an image, and the imaging module is disposed between the light source and the L-type projection lens and is located on the light weight transmission path. l

The type of lens includes the above-described focus lens group, the lens group, and the mirror. In addition, the imaging module includes a light valve, and the light valve is disposed between the light source and the L-shaped projection lens. According to an embodiment of the invention, the optical projection device further comprises, for example, a color generating element disposed between the light source and the light valve, wherein the color generating element is, for example, a color wheel or a color drum. According to the y embodiment of the present invention, the light valve is, for example, a digital micromirror, a pre-dip, a reflection-decrystallized crystal age unit or a transmissive liquid crystal display unit.

In accordance with an embodiment of the invention, the imaging module further includes, for example, a sputum mirror disposed between the light valve and the light source and located in the path of the beam to reflect the light beam to the light valve. In the above, the l-type projection lens of the present invention can fulfill the optical projection =, H, and the image size and position projected on the screen. Among them, the "group and the focus lens group can adjust the image zoom ratio and the w projection lens of the present invention have better compatibility, and can be applied to optical projection devices of different specifications. 7 l2S2m 4twf.d〇c/g The above and other objects, features, and advantages of the present invention will become more < A schematic diagram of an optical projection device using an L-type projection lens, and FIG. 4 is a schematic diagram of an optical path of the optical projection device of FIG. 3. Referring to FIG. 3 and FIG. 4 together, the optical projection device 300 includes a light source. 31〇, an L-type projection lens 32〇 and an imaging module 330. The light source 310 is used to provide a light beam, and the L-shaped projection lens 32 is used to project the light beam provided by the light source 310 to a mirror 3〇〇a The screen %2 is used to form an image, wherein the screen 3〇2 is, for example, a screen of a rear projection television for viewing by a user. In addition, the imaging module 330 includes a light valve 332, and the light valve 332 is disposed on the light source 31. With type B Between the projection lens 32〇, here, the L-type projection lens 320 will be further described. Please refer to FIG. 5′, which is a partial enlarged view of the optical projection device of FIG. 4. • ^ 5 can be seen as 'L-type projection The lens 32A includes a focusing lens group 322, a lens group 324, and a mirror 326, wherein the focusing lens group, the focusing mirror group 324, and the mirror 326 are all disposed in the transmission of the light beam. The focusing lens group 322 has an adjustment. The function of the sharpness of the image, 镅11, the image formed on the screen 3〇2 can be used to achieve the image clarity by the focus lens group 322. In addition, the zoom lens group 324 敕乂 敕乂 ize the image zoom The rate means that the size of the image plane on the screen is adjusted by the zoom lens group 324. In addition, the mirror 326 f.doc/g is located between the focus lens group 322 and the zoom lens group 324. To reflect the light beam. Therefore, when the optical projection device 3 of the present invention is applied to a rear projection television of different specifications, the L-type projection lens 320 in the optical projection device 3 can change the image size on the screen of the rear projection television. versus Image position, to adjust the image zoom ratio and sharpness. As described above, the zoom lens group 324 is disposed between the mirror 326 and the light source 310, and the light beam passing through the zoom lens group 324 is reflected by the mirror 326. The light beam is reflected to the focus lens group milk and is projected through the mirror onto the screen 302 (as shown in Fig. 3). Of course, the focus lens group 322 and the zoom lens group 324 are located in the L-type projection lens 32's arrangement position. For example, the focusing lens group 322 is disposed between the mirror 326 and the light source 31A, and the light beam passing through the focusing lens group 322 is reflected by the mirror 326 to the zoom lens group 324, and Projected onto the screen 302 via reflection 3〇〇a. The zoom lens group 324 of the present invention may include, for example, a - lens unit 324a and

. The lens unit 324b, wherein the first lens unit shirt and the second lens: 24b are, for example, single-lens, respectively, or a group consisting of a plurality of lenses, respectively. Further, the first lens unit and the second lens unit b can be relatively moved'. Therefore, the image size and position can be adjusted by changing the above two fresh positions. Referring to FIG. 4 again, the optical projection device 300 further includes, for example, a color generating component 340 for forming a color display of different ages. In the middle, the color generating element is, for example, a color wheel I28243S: wf.doc/g or a color drum (shown as a color wheel in Fig. 4) disposed between the light source 310 and the light valve 322. In general, the color wheel (color drum) may have a plurality of filter blocks to provide an output of color light such as red, green, or blue light.

In addition, the imaging module 330 further includes an internal total reflection 稜鏡 334 disposed between the light valve 332 and the light source 310 and located on the transmission path of the light beam, wherein the internal total reflection 稜鏡 334 is used to The light beam is reflected to the light valve 332. The light valve 332 is, for example, a digital micromirror unit, a reflective single crystal germanium liquid crystal display unit, or a transmissive liquid crystal display unit. The light valve 332 of this embodiment is exemplified by a digital micromirror device having a plurality of lenses (not shown), wherein the micromirror exhibiting an ON state reflects the light beam to the L-type projection lens 320 to be projected by the projection lens. 320 projects the beam onto the screen 302 for imaging. Further, the micromirror exhibiting the OFF state causes the light beam to deviate from the L-type projection lens 320. In summary

The invention is provided with a zoom lens group in the L-type projection lens for adjusting the imaging size and position with the original focus lens group, so that the image zoom ratio and the sharpness can be adjusted. In other words, the B-type projection lens of the present invention can be compatible with the production of optical projection devices of different specifications (such as b-TV), and can accurately adjust the image to conform to the established position. When the L-type projection mirror of the present invention is used for the production of different specification projection apparatuses, it is no longer necessary to re-sign the projection lens, and the development manpower and cost can be greatly saved. In addition, the present invention is directed to the system integration of an optical projection device. Although the present invention has been disclosed in the preferred embodiments as above, it is not intended to limit the invention to 10 f.doc/g I28243Siw, and anyone skilled in the art, The scope of the present invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a rear projection of a conventional L-type projection lens. $

FIG. 2 is a partially enlarged schematic view showing the L-type projection lens of FIG. 1. FIG. Figure 3 is a schematic illustration of an optical projection device of the head of the preferred embodiment of the present invention. Double Figure 4! shows the optical path of the optical projection device of Figure 3. FIG. 5 is a partially enlarged schematic view of the optical projection device of FIG. 3. FIG. [Main component symbol description] 100: Rear projection television 100a: Mirror 110 · L-type projection mirror 颂 112: Fixed lens group 114: Focus lens group 116: Mirror 120: Optical engine 130: Screen 300: Optical projection device 300a : Mirror 302 : Screen 310 : Light source f.doc/g 320 : L-type projection lens 322 : Focusing lens group 324 : Zoom lens group 324a : First lens unit 324b : Second lens unit 326 : Mirror 330 : Imaging mode Group 332: Light Valve 334: Internal Total Reflection 稜鏡 340: Color Generation Element

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Claims (1)

128243⁄4 :wf.doc/g X. Patent application scope: 1. An L-shaped projection lens adapted to project a light beam generated by a light source onto a screen to form an image. The L-type projection lens comprises: a focusing lens a set, disposed on the transmission path of the beam, to complete the sharpness of the image; μ a 'focus lens group disposed on the transmission path of the beam for adjusting the zoom ratio of the image; and w, one The mirror is disposed on the transmission path of the light beam and located between the focusing lens group and the zoom lens group. 2. The projection lens according to claim i, wherein the focusing lens assembly is disposed between the mirror and the screen, and the lens assembly is disposed between the mirror and the light source. [3] A type of projection lens according to the first aspect of the patent application, wherein the focal lens group is disposed between the mirror and the screen, and the condenser lens group is disposed on the mirror and the mirror Between the light sources. ", 4. The zoom lens group as described in the scope of claim 2 includes a first lens unit and 4:: single flip, which can adjust the zoom ratio of the image. 'The relative shift of the lens is 5%. An optical projection device comprising a light source adapted to provide a light beam; - an image of the L-shaped projection lens comprising: a material to be shaped by a focusing lens group On the transmission path, 13 12824^9, twf.doc/g is used to adjust the sharpness of the image; the Echo lens group is disposed on the transmission path of the beam to adjust the zoom ratio of the image; a mirror disposed on the transmission path of the light beam and located between the focusing lens group and the zoom lens group; and an imaging module disposed between the wire and the L 彡 lens and located in the transmission path of the light beam The imaging module includes an aperture, and the fine gamma is disposed between the light source and the social projection lens. The optical projection device of claim 5, wherein the focusing lens assembly Configured in the mirror and Between the screens, the zoom lens assembly is disposed between the mirror and the imaging module. The optical projection device of claim 5, wherein the zoom lens assembly is disposed in the reflection Between the mirror and the screen, the back focus lens assembly is disposed between the mirror and the imaging module. The optical projection device of claim 5, wherein the zoom lens assembly comprises a The first lens unit and a second lens unit, wherein the zoom ratio of the image is adjusted by the relative movement of the first lens unit and the second lens unit. 9. The patent item 5 is as claimed in claim 5 The optical projection device further includes a color generating component disposed between the light source and the light valve. The optical projection device of claim 9, wherein the color generating component comprises a color wheel or The optical projection device of claim 5, wherein the light valve comprises a digital micromirror unit, a reflective single crystal germanium liquid crystal display single mirn ^twf.doc/g element or One The optical projection device of claim 5, wherein the imaging module further comprises an internal total reflection prism disposed between the light valve and the light source, and Located on the transmission path of the beam to reflect the beam to the light valve.