KR20060085418A - Structure of liquid crystal cell and projection lens and image projection system using the same - Google Patents

Abstract

The present invention provides a liquid crystal cell that can be easily rotated and moved in an axial direction or a liquid crystal cell that can be easily rotated and moved in an axial direction and / or a projection lens structure for a liquid crystal projector that can be easily moved in an axial direction, and image projection using the same. Apparatus, the liquid crystal cell and the projection lens structure according to the present invention, R, G and B liquid crystal cells, and R, G and B liquid crystal cells are attached to each other, the central portion of at least R, G and B liquid crystal cells A plurality of holders having a window through which light incident on the effective screen portion is transmitted, and an alignment hole penetrating at a predetermined diameter in the vicinity of the corner; and protrudingly formed with a diameter smaller than the diameter of the alignment hole. A carrier having an alignment pin inserted into the in-hole and having a bar-shaped upper frame and a lower frame, an adhesive for bonding each holder and the carrier, and R and G B are respectively provided in correspondence to the liquid crystal cell, it characterized in that it comprises a plurality of the projection lens to be mounted on the reverse side that is R, G, and B liquid crystal cells are arranged in the carrier.

Liquid crystal cell; Projection lens; Image projection apparatus; Conversion

Description

Liquid Crystal Cell and Projection Lens Structure and Image Projection Device Using the Same

1 is a block diagram of an image projection apparatus using a conventional 3-liquid crystal 3-projection lens.

2 is a perspective view showing a holder for holding a liquid crystal cell according to the present invention.

3 is a state diagram showing a state in which a liquid crystal cell is attached to a holder according to the present invention.

4 is a state diagram for explaining a process of aligning a liquid crystal cell to a carrier according to the present invention.

5 is a cross-sectional view illustrating a process of aligning a liquid crystal cell with a carrier according to the present invention.

6A and 6B are perspective views of the projection lens structure as one embodiment according to the present invention.

7A and 7B are perspective views showing the structure of the image projection apparatus according to the present invention.

8A and 8B are perspective views showing the structure of the adjusting reflector used in the liquid crystal projection optical system according to the present invention.

9 is a diagram showing the structure of another embodiment of an image projection device according to the present invention;

*** Explanation of symbols on the main parts of the drawing ***

20: carrier 20a, 20b, 20c, 20d: alignment pin

22: rail 30a, 30b, 30c: liquid crystal cell

32: substrate 34: analyzer

36a, 36b, 36c: projection lens 50: light source

51: heat dissipation fan 52, 54: fly eye lens

53 UV / IR filter 55 PBS array

56, 57: dichroic mirror 58: reflector

60: first illumination system lens 61: adjustable reflector

62: second illumination lens 63: reflector case

64: adjusting screw head portion 65: adjusting screw

66: spring 70, 71: polarizer

80: lower frame 81: connecting bar

82: upper frame 100: liquid crystal cell and projection lens structure

110: holder 110a, 110b, 110c, 110d: alignment hole

111: flexible cable

The present invention relates to a liquid crystal cell and a projection lens structure and an image projection apparatus using the same, and more particularly, a liquid crystal cell that is easy to rotate and move in an axial direction or a liquid crystal cell that is easy to rotate and move in an axial direction and / Or it relates to a projection lens structure for a liquid crystal projector that can be easily moved in the axial direction and an image projection apparatus using the same.

Projection apparatus using liquid crystal separates the light from the light source by R, G, and B through a dichroic mirror, and then uses an image through the liquid crystal to selectively turn on / off the light separated by each color. It is a device that provides information. Conventionally, a projection apparatus using a CRT (Cathode Ray Tube) is mainly used instead of a liquid crystal, but a projection apparatus using a CRT has been replaced by a projection apparatus using a liquid crystal due to a disadvantage of taking up a lot of volume.

As a projection device using liquid crystal, (1) the light source is separated into R, G, and B, an image for each color is generated, and then R, G, and B are synthesized using a synthetic lens, and the synthesized image is projected onto the screen And (2) separate light sources into R, G, and B, generate images for each color, and project them on a screen to match conversion.

A typical configuration of an image projection apparatus using a conventional liquid crystal is shown in FIG. 1 is a block diagram of an image projection apparatus using a conventional 3-liquid crystal 3-projection lens. A configuration of a conventional image projection apparatus will be described below with reference to FIG. 1.

Light emitted from the lighting device 2 having at least one light source 1 is incident on the R, G, B dichroic mirrors 4, 5, 6 system 7 via the UV blocking lens 3. . Each dichroic mirror 4, 5, 6 functions to reflect only the light of the corresponding wavelength band and pass the rest. For example, the R dichroic mirror 4 reflects only light in the R wavelength band and transmits light in the remaining wavelength band. The light reflected by each dichroic mirror 4, 5, 6 is incident on the respective liquid crystal cells 11, 12, 13 through the field lenses 8, 9, 10. Images of R, G, and B are formed by on / off operations of the liquid crystal cells 11, 12, and 13, and the images for each color are projected on the screen 17.

As shown in FIG. 1, since the distances reaching the center of the screen 17 from the projection lenses 14, 15, and 16 of R, G, and B are respectively different, the G liquid crystal cell 12 and the projection lens ( 15 is arranged on the same line, the R liquid crystal cell 13 and the R projection lens 16 and the B liquid crystal cell 11 and the B projection lens 14 positioned on both sides are not shown in the drawing, but Placed slightly apart on the phase so that light is incident toward the center point of the screen 17. Also, it can be seen that the distance from which the light emitted from the R, G, and B projection lenses reaches varies from each projection lens 14, 15, 16 to both edge portions of the screen 17. FIG. Therefore, in the case of the 3-liquid crystal 3-projection lens system as shown in FIG. 1, each projection lens or liquid crystal cell can be easily adjusted to accurately convert the light emitted from the R, G, and B projection lenses onto the screen. There is a need for liquid crystal and projection lens structures.

On the other hand, the conventional image projection apparatus used a structure including a linear optical system and a plurality of reflectors to project an image on the screen. That is, when light is projected from the linear optical system toward the lower portion of the screen, the light is reflected in a predetermined direction by the first reflector disposed at a predetermined angle in front of the linear optical system, which is again at a predetermined angle on the upper part of the linear optical system and the first reflector. The structure reflected by the second reflector disposed and projected onto the screen was used. However, in the case of such a linear optical system structure, since the first reflecting mirror is disposed in front of the linear optical system, not only the assembly of the image projector is difficult, but the width of the image projector is increased, thereby increasing the total area of the image projector. For this reason, there is a problem in that the installation and movement of the image projection apparatus is restricted.

In order to solve this conventional problem, an image projection apparatus using an L-shaped optical system including an X-cube for changing the direction of light has been proposed. In this case, since the direction of light is switched by the X-cube inside the L-shaped optical system, a structure having only a reflecting mirror disposed at a predetermined angle on the top thereof without applying a separate reflecting mirror can be applied. Therefore, the light projected from the L-shaped optical system is reflected by the reflector to be projected onto the screen. However, the L-shaped optical system has a problem of increasing the manufacturing cost of the entire image projection apparatus by using an expensive X-cube inside.

The present invention is to meet the above necessity, an object of the present invention is to provide a liquid crystal cell and a projection lens structure and the image projection apparatus using the same that can easily perform the conversion control by the horizontal axis and vertical axis movement and rotational movement will be.

In addition, another object of the present invention is to combine a liquid crystal cell that is easy to move and rotate the horizontal axis and vertical axis and a projection lens that is easy to move the horizontal axis, and more precise conversion control liquid crystal cell and projection lens structure and an image projection apparatus using the same To provide.

In addition, another object of the present invention can form a width of the image projection apparatus by reflecting the direction of the light emitted from the light source at any angle without using expensive components such as X-cube, thereby making the image It is to provide an image projection apparatus that reduces the manufacturing cost of the projection apparatus and makes it easy to install and move the image projection apparatus.

In order to achieve the above object, the liquid crystal cell and the projection lens structure according to the present invention is a liquid crystal cell and a projection lens structure capable of rotation and movement in a predetermined axial direction, R, G and B liquid crystal cells, R, G And a B liquid crystal cell, each of which has a window through which light incident on an effective screen portion of the R, G, and B liquid crystal cells is transmitted, and an alignment hole formed through a predetermined diameter near a corner thereof. A carrier having a plurality of holders, an alignment pin protruding to a diameter smaller than the diameter of the alignment holes and inserted into the alignment holes of each holder, the upper frame and the lower frame having a bar shape, and each holder. And a plurality of projection lenses which are respectively provided in correspondence with the R, G and B liquid crystal cells, and are mounted on opposite surfaces on which the R, G and B liquid crystal cells are disposed. It is characterized by.

Preferably, the liquid crystal cell and the projection lens structure are each provided with respect to the R, G and B liquid crystal cells, the plurality of analyzers are provided at a position spaced a predetermined distance away from the back of each liquid crystal cell with respect to the incident direction of light, A plurality of substrates are further attached to one surface of each analyzer so as to face the incident direction of light, and each projection lens is disposed at a position spaced a predetermined distance apart from the rear surface of each analyzer with respect to the incident direction of light. At this time, the substrate is to use a sapphire substrate. In addition, each projection lens is to be bonded to at least one of the upper frame and the lower frame of the carrier, it is preferable to include a rail portion formed in the transverse direction on the surface of the upper frame and the lower frame of the carrier is fixed. In addition, UV (Ultra Violet) curing agent to be used as the adhesive. In addition, the liquid crystal cell and the projection lens structure are arranged on opposite surfaces on which the R, G, and B liquid crystal cells are respectively disposed among the carriers, and have a frame having through grooves formed on both sides thereof, and at least one mounted above and below the frame. A plurality of support plates each provided with a shaft and each projection lens and having insertion grooves formed through the left and right so that the respective shafts are fitted at the upper and lower ends thereof, and each mounted on the rear surface of each supporting plate with respect to the incident direction of light; At least one elastic member which is fitted between the projection lens and each shaft and is inserted between the insertion grooves of adjacent support plates of each support plate to support each support plate, and is inserted into and coupled to each through groove of the frame to press the side of the support plate. The microcontroller further comprises. At this time, each support plate, so as to further include a plurality of through grooves formed through the front and rear so that the fixing member for fixing each support plate to the frame.

In addition, in order to achieve the above another object, the image projection apparatus using the liquid crystal cell and the projection lens structure according to the present invention, a dichro to separate the light emitted from the at least one light source and the light source by R, G and B An image projection apparatus using a liquid crystal cell and a projection lens structure capable of selectively turning on / off a light output from a dichroic mirror and rotating and moving in a predetermined axial direction, wherein the liquid crystal cell and the projection lens structure include: R, G and B liquid crystal cells and R, G and B liquid crystal cells are attached to each other, and a central portion is provided with a window through which light incident on the effective screen portion of the R, G and B liquid crystal cells is transmitted, and near the corners. Has a plurality of holders having alignment holes penetrated to a predetermined diameter, and aligning pins protruding to a diameter smaller than the diameter of the alignment holes and inserted into the alignment holes of the respective holders. A carrier having a top frame and a bottom frame having a bar shape, an adhesive for adhering each holder and the carrier, and R, G, and B liquid crystal cells, respectively. It characterized in that it comprises a plurality of projection lenses mounted on the opposite surface disposed.

Preferably, the liquid crystal cell and the projection lens structure are arranged on the opposite surface on which the R, G and B liquid crystal cells of the carrier are respectively disposed, and have a frame having through grooves formed through the left and right sides of the carrier, and mounted above and below the frame. A plurality of support plates each provided with at least one shaft, each of the projection lenses and having insertion grooves formed through the left and right so that the shaft is fitted at the top and the bottom thereof, and mounted on the rear surface of each support plate with respect to the incident direction of light. A plurality of elastic members which are fitted between each projection lens and each shaft and are inserted between the insertion grooves of adjacent support plates of each support plate, and which are inserted and fastened to each through groove of the frame and press the side surfaces of the support plates. To further include a fine control unit. The image projection apparatus further includes an illumination optical system for reflecting light separated into R, G and B by a dichroic mirror at a predetermined angle, wherein the illumination optical system is R, G and B by a dichroic mirror. A plurality of first illumination system lenses for respectively condensing the light separated by the plurality of light sources, a plurality of adjustment reflectors each reflecting the direction of the light projected from the first illumination system lens at a predetermined angle, and a plurality of agents respectively condensing the light reflected from the adjustment reflectors It includes a two illumination system lens, and the light projected from each second illumination system lens is respectively incident to the R, G and B liquid crystal cells. At this time, the second end is fixedly mounted to each vertex region of the virtual triangle disposed at a position spaced apart from the center of the reflector case in which the adjusting reflector is accommodated and the rear region of the adjusting reflector by a predetermined distance. A plurality of adjustment screw head portion is formed, a plurality of adjustment screws, each of which is fitted to each adjustment screw, and a plurality of adjustment screw head portion is formed in the screw groove is formed along the inner circumference Further, each adjustment screw is fitted into a plurality of through-holes formed in a predetermined area of the housing of the image projection apparatus for fixedly mounting the adjustment reflector, the second end of each adjustment screw and each adjustment screw head portion to the outside of the housing To be deployed.

Hereinafter, with reference to the accompanying drawings will be described in detail the advantages, features and preferred embodiments of the present invention.

2 is a perspective view showing a holder holding a liquid crystal cell according to the present invention, Figure 3 is a state diagram showing a state in which the liquid crystal cell is attached to the holder according to the present invention. 4 is a state diagram illustrating a process of aligning a liquid crystal cell to a carrier according to the present invention, and FIG. 5 is a cross-sectional view illustrating a process of aligning a liquid crystal cell to a carrier according to the present invention. Hereinafter, the structure and operation of the liquid crystal cell and the projection lens structure according to the present invention will be described with reference to FIGS. 2 to 5.

Light separated for each color is incident on the liquid crystal cells 30a, 30b, and 30c for R, G, and B through a dichroic mirror. Each liquid crystal cell may be configured as R, G, B, or B, G, and R from the left side. Hereinafter, for convenience of description, reference is made to R, G, and B.

In the liquid crystal cell and the projection lens structure 100, the liquid crystal cells 30a, 30b, and 30c, the substrate 32, and the projection lens 36 are sequentially disposed with respect to the incident direction of light, and each of the liquid crystal cells and the projection lens structure is formed by the carrier 20. It is fixed. In addition, an analyzer 34 is attached to one surface of the substrate 32 with respect to the traveling direction of the light, and the liquid crystal cells 30a, 30b, 30c, the substrate 32, the analyzer 34, and the projection lens 36 Place them apart from each other. That is, air gaps 38a and 38b are formed between the liquid crystal cell, the substrate, the analyzer, and the projection lens. The substrate 32, the analyzer 34, and the projection lens 36 are provided for the R, G, and B liquid crystal cells 30a, 30b, and 30c, respectively. Each component is described in detail as follows.

The liquid crystal cells 30a, 30b, and 30c are fixed to the holder 110, and the holder is fixed to the carrier 20 again to mount each liquid crystal cell to the carrier. At least the center portion of each holder 110 is provided with a window through which light incident on the effective screen of the liquid crystal cell is transmitted, and four corner portions are provided with alignment holes 110a, 110b, 110c, and 110d, respectively. As shown in FIG. 3, the liquid crystal cell 30a is inserted into a small hole around the window of the holder or fixed by using an adhesive, and is connected to an external control circuit through a flexible cable 111.

In addition, the upper and lower portions of the carrier 20 are provided with alignment pins 20a, 20b, 20c, and 20d respectively fitted into the alignment holes 110a, 110b, 110c, and 110d of the holder 110. At this time, the diameter of the alignment pins 20a, 20b, 20c, and 20d is smaller than that of the alignment holes 110a, 110b, 110c, and 110d to have a clearance, thereby substantially moving the liquid crystal cell in the horizontal / vertical direction. Or rotate it. Specifically, the holder 110 by using the clearance between the alignment pin and the alignment hole in a state in which the alignment pins 20a, 20b, 20c, 20d and the alignment holes 110a, 110b, 110c, and 110d are bound. Can be moved vertically (in the Y-axis direction) or horizontally (in the X-axis direction), and θ _Z can be rotated by tilting the holder in a specific direction. Accordingly, the liquid crystal cells 30a, 30b, and 30c mounted on the holder may be moved by X / Y axis and rotated θ _Z to adjust and match the conversion on the screen. An example of adjusting the liquid crystal cells 30a, 30b, and 30c will be described with reference to FIG. 4.

In the state diagram of FIG. 4, the liquid crystal cell 30a is moved in parallel in the + y-axis direction. This can be confirmed that the alignment pins 20a, 20b, 20c, and 20d are in contact with the lower portion of the alignment holes 110a, 110b, 110c, and 110d. In addition, the liquid crystal cell 30b is moved in parallel in the -y axis direction, which can be confirmed that the alignment pin is in contact with the upper portion of the alignment hole. The liquid crystal cell 30c is rotated in the −θ _Z rotational axis direction, and this can also be confirmed as a contact state with the alignment hole of the alignment pin. In a similar manner, it is possible to move each liquid crystal cell in parallel in the x-axis direction and / or the z-axis direction. Meanwhile, in FIG. 5, the liquid crystal cell 30a and the holder 110 are illustrated as being coupled to each other by pins apart from each other at a slight interval. However, this is only an embodiment of the drawing. It is preferable to adhere the holder 110 in close contact. As described above, the liquid crystal cell 30a and the holder 110 may be bonded using an adhesive.

On the other hand, unlike the above-described alignment holes (110a, 110b, 110c, 110d) formed through the carrier 20, respectively, and the alignment pin (20a, protruding on one surface of the holder 110 facing the carrier) 20b, 20c and 20d) may be provided, of course.

Each substrate 32 is made of glass or sapphire substrate. The substrate 32 is mounted on the carrier 20 corresponding to each of the liquid crystal cells 30a, 30b, and 30c, wherein the perimeter region of the substrate is in contact with a part of the carrier. As described above, the analyzer 34 is attached to one surface of each substrate 32, that is, the front or rear surface of the substrate with respect to the traveling direction of light.

Each projection lens 36 has a bottom surface coupled to the carrier 20, and a rail 22 is formed as a surface of the carrier that the bottom surface of the projection lens contacts. Therefore, each projection lens 36 can be slid along the rail 22, so that the position in the X-axis direction can be easily adjusted. On the other hand, the carrier 20 may bind the top surface of each projection lens 36 and form a rail 22 on the contact surface of the carrier in contact with the top surface of each projection lens, and the carrier may contact the top and bottom surfaces of each projection lens. It can also be configured to bind at the same time. After each projection lens 36 is adjusted in the X-axis direction, the projection lens 36 is fixed by using an adhesive, a screw, or other fastening means. It is a matter of course that the magnification of the projection lens can be adjusted by turning each projection lens 36.

Meanwhile, as shown in FIGS. 2 to 5, the alignment pins 20a, 20b, 20c and 20d and the alignment holes 110a, 110b, 110c and 110d may be used to form the liquid crystal cells 30a, 30b and 30c. When the horizontal and vertical axis movement and rotation is possible, each projection lens 36 may be fixed. 6A and 6B described below, the projection lens can be modified into a structure having a shaft.

A process of aligning using the liquid crystal cell illustrated in FIGS. 2 to 5 will be described.

First step: The liquid crystal cells 30a, 30b, 30c are coupled to the holder 110. Specifically, the liquid crystal cell is inserted into a small hole around the window of the holder or fixed using an adhesive.

Second step: Insert the combined liquid crystal cells 30a, 30b, and 30c into the alignment pins 20a, 20b, 20c, and 20d of the carrier 20, respectively. That is, the alignment holes 110a, 110b, 110c, and 110d of the holder 110 for each liquid crystal cell are inserted into the alignment pins.

Third step: After holding the holder 110 by using the alignment equipment to finely move the holder to adjust the alignment of each liquid crystal cell (30a, 30b, 30c). As described above, the alignment control of the liquid crystal cell uses a gap between the alignment holes 110a, 110b, 110c, and 1110d and the alignment pins 20a, 20b, 20c, and 20d.

Fourth step: UV between alignment pins 20a, 20b, 20c, 20d and holder 110, in particular alignment holes 110a, 110b, 110c, 110d, in order to fix each aligned liquid crystal cell. Apply the adhesive.

5th step: The process of aligning a liquid crystal cell to a desired position is completed by irradiating UV-ray to the apply | coated UV adhesive and hardening a UV adhesive.

Variation 1

The liquid crystal cell and the projection lens structure and the image projection apparatus using the same according to the present invention are each projection lens for the liquid crystal cell separately from the X / Y axis movement and θ _Z rotation of the liquid crystal cells (30a, 30b, 30c) as described above By adjusting the X-axis position, the conversion to the screen can be adjusted more precisely. In this case, the liquid crystal cell may move only the Y axis and rotate the θ _Z and move and adjust the X-axis of the projection lens. The structure of the projection lens capable of X-axis movement will be described with reference to FIG. 6.

6 is a perspective view of a projection lens structure according to the present invention, Figure 6a is an exploded perspective view of the projection lens structure, Figure 6b is a combined perspective view of the projection lens structure. The projection lens structures shown in FIGS. 6A and 6B are components corresponding to the rear ends of the carriers 20 on which the projection lenses 36 are mounted, based on the traveling direction of light in FIG. It is for adjusting the X-axis position of (36a, 36b, 36c) more precisely. Each projection lens of FIGS. 6A and 6B is arranged in the order of R, G, B or B, G, R from the right side, and in the following, the projection lenses are arranged in the order of R, G, B from the right side in order to match the above description. On a case-by-case basis.

The projection lens structure has shafts 44a and 44b mounted to the front and bottom of the frame 40, and supporting plates 42a, 42b and 42c of the projection lenses 36a, 36b and 36c are attached to the shafts above and below. Insertion grooves formed through left and right are formed at the upper and lower ends of the support plates 42a, 42b and 42c so as to be fitted to the shafts 44a and 44b, and projected toward the front of the support plates (the direction in which light is emitted). The lens outer barrels 37a, 37b, 37c are respectively mounted. Each of the projection lens outer barrels is equipped with R, G, and B projection lenses 36a, 36b, and 36c.

On the other hand, two springs 46a and 46b are fitted to the upper and lower shafts 44a and 44b. Specifically, they are provided between the insertion grooves of the respective support plates 42a, 42b and 42c. In addition, on both sides of the frame 40, fine adjustment screws 48a and 48b for finely adjusting the X-axis position of the support plates 42a and 42c on both sides of each support plate are mounted. The side to form a through groove formed through the left and right.

Referring to the process of adjusting the X-axis position of the projection lens (36a, 36b, 36c) using the lens structure according to the present invention.

First step: After each projection lens support plate 42a, 42b, 42c is fitted to the shafts 44a, 44b, the support plate 42b of the G projection lens disposed in the center is fixed to the frame.

Second step: After adjusting the X-axis position of the R projection lens support plate and the B projection lens support plate using the left and right fine adjustment screw (48a, 48b) is fixed to the frame 40. Specifically, when the fine adjustment screws 48a and 48b are tightened, the fine adjustment screws are pushed on the right side of the support plate 42a of the R projection lens and the left side of the support plate 42c of the B projection lens disposed on both sides. , Both support plates 42a and 42c move in a direction in close contact with the support plate 42b of the G projection lens. Further, when the fine adjustment screws 48a and 48b are released, the R projection lens support plate 42a and the B projection lens support plate 42c are pushed by the springs 46a and 46b, respectively, to be separated from the G projection lens support plate 42b.

Third step: Each projection lens 36a, 36b, 36c is turned to adjust the magnification of each projection lens.

Accordingly, X of the liquid crystal cells 30a, 30b, and 30c is formed by using a gap between the alignment holes 110a, 110b, 110c and 110d of each holder 110 and the alignment pins 20a, 20b, 20c and 20d. By adjusting the X-axis position of the projection lenses 36a, 36b, and 36c separately from the / Y-axis position adjustment and the θ _Z rotation, it is possible to more accurately match the conversion on the screen.

Modification 2

The image projection apparatus using the liquid crystal cell and the projection lens structure according to the present invention separates the light emitted from the light source into R, G, B and reflects the separated light through a separate illumination optical system in a predetermined direction, respectively. The width can be made thin to facilitate installation and movement. That is, the light separated into R, G, and B by the dichroic mirror is collected through the illumination optical system and reflected in a predetermined direction, and then the image is generated through the R, G, and B liquid crystal cells 30a, 30b, and 30c. After that, the light is projected through the projection lens, and the projected light is projected on the screen through the reflector. Therefore, since a separate expensive component such as an X-cube is not used to reflect light in a certain direction, manufacturing cost of the image projection apparatus can be reduced. As described above, the image projection apparatus to which the illumination optical system is applied will be described with reference to FIGS. 7A and 7B and 8A and 8B.

7A and 7B are perspective views showing the structure of the image projection apparatus according to the present invention. FIG. 7A is a front view of the image projection apparatus according to the present invention, and FIG. 7B is a rear view of the image projection apparatus according to the present invention. This is a perspective view. Hereinafter, the structure of the image projection apparatus according to the present invention will be described with reference to FIGS. 7A and 7B, but the description of the basic components of the image projection apparatus will be omitted, and the description will be given based on the components related to the illumination optical system.

The illumination optical system receives light separated into R, G, and B by dichroic mirrors 56, 57, and reflectors 58, respectively. The light efficiency is improved by irradiating the cells 30a, 30b, and 30c. The illumination optical system is provided with respect to the light of R, G, and B, respectively, and each illumination optical system includes a first illumination system lens 60, an adjustment reflector 61, and a second illumination system lens 62.

The first illumination system lens 60 is disposed to correspond to the dichroic mirrors 56 and 57 and the reflector 58, respectively, and receives and condenses the light of R, G, and B separated by the dichroic mirror and the reflector. And then project onto each adjustment reflector 61.

The adjusting reflector 61 is disposed corresponding to each of the first illumination system lenses 60, and reflects the light collected by the first illumination system lens so that the irradiation direction of the light can be bent by 90 ° or more. Therefore, the length of the optical system is shorter than that of the conventional linear optical system, thereby reducing the width of the image projection apparatus, and since the reflector is not disposed under the screen, the length of the lower screen is also reduced. In addition, since it is not necessary to use expensive components such as X-cube to reflect the incident light in a certain direction, manufacturing cost of the image projection apparatus can be reduced.

The adjusting reflector 61 may be attached to the lower housing 80 and move in the lower housing to adjust the angle at which the light is reflected and bent, which will be described in detail with reference to FIGS. 8A and 8B below. .

The second illumination lens 62 collects the light reflected by each of the adjustment reflectors 61 and irradiates the R, G, and B liquid crystal cells 30a, 30b, and 30c, and each of the liquid crystal cells is R, G, and B. Create an image. The R, G, and B images generated by each liquid crystal cell are projected by the R, G, and B projection lenses 36a, 36b, and 36c, respectively, and then reflected by a reflector (not shown) outside the image projection apparatus to display a screen ( (Not shown).

Reference numeral 50 denotes a light source that emits light, and 51 denotes a heat radiating fan that emits heat of the light source. In addition, 52 and 54 are the first and second fly-eye lenses for collecting the light emitted from the light source, 53 is a UV / IR filter for blocking ultraviolet (UV) and infrared (IR) contained in the light emitted from the light source, 55 shows a polarizing beam splitter (PBS) array for polarizing incident light. And 70 and 71 represent the polarizing plates which polarize incident light. Each component is applied to the image projection apparatus as well, and those skilled in the art may easily understand the configuration and operation thereof and thus the detailed description thereof will be omitted.

On the other hand, each component of the image projection apparatus is installed in a predetermined position in a housing of a predetermined size, in particular, the light source 50, the dichroic mirrors 56 and 57, the reflector 58 and the first illumination system lens of the illumination optical system ( 60 and the adjusting reflector 61 are installed in the lower housing 80, and the second illumination lens 62, the liquid crystal cells 30a, 30b and 30c of the illumination optical system, and the projection lenses 36a, 36b and 36c are upper portions. It is installed in the housing 82. In addition, the upper housing 82 and the lower housing 80 is connected by a connecting bar 81, the connecting bar to rotate in a state in which one axis is fixed to the lower housing so that the upper housing is a predetermined angle with respect to the lower housing Allow it to rotate until

8A and 8B are perspective views showing the structure of the adjustment reflector used in the liquid crystal projection optical system according to the present invention, FIG. 8A is a perspective view of the adjustment reflector according to the present invention, and FIG. 8B is an adjustment reflector according to the present invention. This is a perspective view from the back. Referring to Figures 8a and 8b will be described with respect to the structure of the adjustment reflector according to the present invention.

As described above, the adjustment reflector 61 should be able to adjust the angle in the lower housing in order to adjust the angle at which the incident light is reflected. To this end, the reflector case 63 for accommodating the adjusting reflector 61 and the rear surface of the reflector case are provided to further include an adjusting screw 65 for adjusting the reflecting angle of the adjusting reflector. The adjusting screw 65 is fixedly mounted to the first end of each of the vertices of the imaginary triangle which is separated by a predetermined distance from the center of the reflector case 63. In addition, each adjustment screw 65 is fitted into a predetermined through hole (not shown) formed in the lower housing 80 with a predetermined spring 66 is attached, wherein the second end of each adjustment screw is It will be exposed to the outside of the lower housing. Accordingly, the adjustment reflector 61 is fixedly mounted to the lower housing 80 by each adjustment screw 65, and the spring 66 is supported between the rear surface of the reflector case 63 and the lower housing. The adjusting screw head 64 is attached to the second end of each adjusting screw 65 exposed to the outside of the lower housing 80. On the other hand, it is preferable to form a predetermined screw groove along the outer circumference of the adjustment screw 65 and the inner circumference of the adjustment screw head 64 and to allow each screw groove to be mutually engaged.

When the adjustment screw head 64 is turned in a predetermined direction from the outside of the lower housing 80 to adjust the angle of the adjustment reflector 61 according to the present invention, the adjustment screw head and the adjustment screw 65 As the screw grooves engage with each other, the adjusting screw head portion tightens or loosens the adjusting screw. As described above, since the spring 66 is supported between the rear surface of the adjustment reflector 61 and the lower housing 80, the distance between the adjustment reflector and the lower housing can be adjusted by turning the adjustment screw head 64. Will be. In addition, it is possible to adjust the angle of the adjustment reflector 61 by adjusting the adjustment screw head 64 differently. In addition, since the angle of the adjustment reflector 61 is adjusted by the screw groove of the adjustment screw 65 and the adjustment screw head 64, it is possible to finely adjust the angle of the adjustment reflector.

Modification 3

In the above, an embodiment in which the liquid crystal cell and the projection lens structure according to the present invention are applied to an image projection apparatus having projection lenses for each of R, G, and B is illustrated. However, unlike this, two images of R, G, and B images are synthesized and projected through the first projection lens, and the other image is projected through the second projection lens, that is, an image having two projection lenses. Applicable to the projection device. The structure of such an image projection apparatus is shown in FIG. 9 is a structural diagram showing a structure of another embodiment of an image projection apparatus according to the present invention. Another embodiment of the image projection apparatus according to the present invention will be described with reference to FIG. 9.

Another embodiment 200 of the image projection apparatus according to the present invention includes a light source 1 for emitting light forward and a fly eye lens 120 and 130 for evening the intensity of light emitted from the light source. A condensing lens (131 to 136) for concentrating incident light, a polarization conversion system (PCS) 140 for converting the polarization state of the light into a stable state, a light of a specific color among the incident light Dichroic mirrors 150 and 151 for reflecting and transmitting the rest, reflectors 152 and 153 for reflecting incident light in a specific direction, phase retarders for converting the polarization direction of the incident light, 160, polarizers 170 to 172 and analyzers 175 to 177 for passing only light having a specific polarization direction among incident light, and a liquid crystal cell 180 for generating an image of light having a specific color incident. 182), mouth Comprises: (Polarizing Beam Splitter, 185 PBS), it enters the first projection lens 190 and the second projecting lens 191 for enlarging and projecting the image on the screen which is a polarizing beam splitter for synthesizing the image of each color. In the structure shown in FIG. 9, instead of the fly's eye lenses 120 and 130, an integrator may be used.

In another embodiment 200 of the image projection apparatus according to the present invention, the light emitted from the light source 1 is selectively reflected by R and G using dichroic mirrors 150 and 151, respectively. Next, light is selectively turned on / off using the R liquid crystal 180 and the G liquid crystal 181, respectively. The selectively projected R / G image is synthesized using the polarization beam splitter 185 and then projected onto the screen using the first projection lens 190. The remaining B light is incident on the B liquid crystal 182 through the reflector 152. The image selectively turned on / off by the B liquid crystal 182 is projected onto the screen using the second projection lens 191. The two colors of light synthesized by the polarization beam splitter 185 may be arbitrarily selected as B / G or R / B, and the light of the other color may be directly projected to the projection lens 191 without passing through the polarization beam separator 185. To be projected on the screen.

Meanwhile, each liquid crystal cell 180 to 182 is mounted to the holder 110 as described above, and the holder is mounted to the carrier 20. That is, the R liquid crystal cell 180 and the G liquid crystal cell 181 are mounted on the holder 110 and the carrier 20 disposed on the incident side of the polarization beam separator 185, and the B liquid crystal cell 182 is second. It is mounted on the holder and the carrier disposed on the incident side of the projection lens 191. Accordingly, the liquid crystal cell is formed on the X / Y axis by using the clearance between the alignment holes 110a, 110b, 110c and 110d of the holder 110 and the alignment pins 20a, 20b, 20c and 20d of the carrier 20. Move and rotate θ _Z to adjust and match the conversion on the screen. After adjusting the liquid crystal cell, the alignment state is fixed by applying and curing a UV adhesive to the alignment hole as described above.

As described above, the liquid crystal cell and the projection lens structure and the image projection apparatus using the same according to the present invention have a remarkable effect that the liquid crystal cell and the projection lens can be easily adjusted for accurate focus control.

That is, the liquid crystal cell and the projection lens structure and the image projection apparatus using the same according to the present invention can precisely control the conversion to the screen by facilitating the X-axis and Y-axis movement and the θ _Z rotation movement of the liquid crystal cell. In addition, by applying a projection lens structure that can finely adjust the X-axis position of the R, G, B projection lens, it is possible not only to precisely adjust the position of each projection lens, but also to the structure in which the liquid crystal cell is fixed, The application is wide because it can be applied to both the Y axis position of the liquid crystal cell and the structure capable of adjusting the θ _Z rotation.

In addition, the image projection apparatus according to the present invention forms a width of the image projection apparatus by reflecting the direction of the light emitted from the light source at an arbitrary angle to facilitate the installation and movement of the image projection apparatus, as well as the X-cube and It is possible to reduce the manufacturing cost of the image projection apparatus because it can be switched in the direction of light without using the same expensive parts.

While the preferred embodiments of the present invention have been described using specific terms, such descriptions are for illustrative purposes only, and it is understood that various changes and modifications may be made without departing from the spirit and scope of the following claims. Should be done.

Claims (13)

A liquid crystal cell and a projection lens structure capable of rotating and moving in a predetermined axial direction, R, G and B liquid crystal cell; The R, G, and B liquid crystal cells are attached to each other, and a central portion has a window through which light incident on the effective screen portion of the R, G, and B liquid crystal cells is transmitted, and penetrates through a predetermined diameter near a corner. A plurality of holders having an alignment hole; A carrier having an upper pin and a lower frame having an alignment pin protruding to a diameter smaller than the diameter of the alignment hole and inserted into the alignment holes of the respective holders, and having a bar shape; An adhesive for adhering the respective holders to the carriers; And The liquid crystal cell and the projection lens are respectively provided corresponding to the R, G and B liquid crystal cells, and are mounted on opposite surfaces on which the R, G and B liquid crystal cells are disposed. Structure. The method of claim 1, The liquid crystal cell and the projection lens structure, A plurality of analyzers provided respectively with respect to the R, G, and B liquid crystal cells, and disposed at positions spaced apart from each other by the rear surface of the liquid crystal cell with respect to the incident direction of light; And Further comprising a plurality of substrates attached to one surface of each analyzer facing the incident direction of light, Each projection lens, The liquid crystal cell and the projection lens structure, wherein the liquid crystal cell is disposed at a position separated by a predetermined distance from the rear surface of each analyzer with respect to the incident direction of light. The method of claim 2, The liquid crystal cell and the projection lens structure, characterized in that the substrate is a sapphire substrate. The method of claim 1, Each projection lens, And at least one of an upper frame and a lower frame of the carrier. The method of claim 4, wherein And a rail portion formed transversely to a surface of the upper frame and the lower frame of the carrier to which the projection lens is bound. The method of claim 1, Liquid crystal cell and the projection lens structure, characterized in that the adhesive is a UV (Ultra Violet) curing agent. The method of claim 1, The liquid crystal cell and the projection lens structure, A frame disposed on opposite surfaces of the carriers in which the R, G, and B liquid crystal cells are disposed, and having through grooves formed on both sides of the carrier; At least one shaft mounted above and below the frame; A plurality of support plates respectively provided for the projection lenses and having insertion grooves formed at left and right sides thereof so that the shafts may be fitted at upper and lower ends thereof; Each projection lens mounted on a rear surface of each support plate with respect to an incident direction of light; A plurality of elastic members fitted to the shafts and disposed between insertion grooves of adjacent support plates of the support plates to support the support plates; And Liquid crystal cell and projection lens structure characterized in that it further comprises one or more fine control unit is inserted into and coupled to each through groove of the frame to press the side of the support plate. The method of claim 7, wherein Each said support plate, The liquid crystal cell and the projection lens structure, characterized in that it further comprises a plurality of through grooves formed through the front and rear so that the fixing member for fixing the respective support plates to the frame. A dichroic mirror that separates at least one light source and light emitted from the light source by R, G, and B, and selectively turns on / off the light output from the dichroic mirror, and rotates and moves in a predetermined axial direction An image projection apparatus using a liquid crystal cell and a projection lens structure capable of The liquid crystal cell and the projection lens structure, R, G and B liquid crystal cell; The R, G, and B liquid crystal cells are attached to each other, and a central portion has a window through which light incident on the effective screen portion of the R, G, and B liquid crystal cells is transmitted, and penetrates through a predetermined diameter near a corner. A plurality of holders having an alignment hole; A carrier having an upper pin and a lower frame having an alignment pin protruding to a diameter smaller than the diameter of the alignment hole and inserted into the alignment holes of the respective holders, and having a bar shape; An adhesive for adhering the respective holders to the carriers; And The liquid crystal cell and the projection lens are respectively provided corresponding to the R, G and B liquid crystal cells, and are mounted on opposite surfaces on which the R, G and B liquid crystal cells are disposed. Image projection apparatus using the structure. The method of claim 9, The liquid crystal cell and the projection lens structure, A frame disposed on opposite surfaces of the carriers in which the R, G, and B liquid crystal cells are disposed, and having through grooves formed on both sides of the carrier; At least one shaft mounted above and below the frame; A plurality of support plates respectively provided for the projection lenses and having insertion grooves formed at left and right sides thereof so that the shafts may be fitted at upper and lower ends thereof; Each projection lens mounted on a rear surface of each support plate with respect to an incident direction of light; A plurality of elastic members fitted to the shafts and disposed between insertion grooves of adjacent support plates of the support plates to support the support plates; And And at least one microadjustment unit inserted into and coupled to each of the through grooves of the frame to compress the side surfaces of the support plate. The method of claim 9, The image projection device, It further comprises an illumination optical system for reflecting the light separated into R, G and B by the dichroic mirror at a predetermined angle, The illumination optical system, A plurality of first illumination system lenses for respectively condensing light separated into R, G, and B by the dichroic mirror; A plurality of adjustment reflectors for respectively reflecting the directions of the light projected from the first illumination lens at a predetermined angle; And A plurality of second illumination system lenses for respectively condensing the light reflected by the adjustment reflector, And a light projecting from each of the second illumination system lenses into the R, G, and B liquid crystal cells, respectively. The method of claim 11, The illumination optical system, A reflector case in which the adjusting reflector is accommodated; A plurality of adjustment screws having a second end fixedly mounted at each vertex region of a virtual triangle disposed at a position spaced a predetermined distance from a center of the rear region of the adjustment reflector case, and having a screw groove formed along an outer circumference; A plurality of springs respectively fitted to the adjustment screws; And And a plurality of adjustment screw heads each of which is attached to the second end of each adjustment screw, which is not fixed, and has a screw groove formed along an inner circumference thereof. The adjustment screws are fitted into a plurality of through holes formed in a predetermined area of the housing of the image projection apparatus for fixedly mounting the adjustment reflector; And a second end of each adjustment screw and each adjustment screw head portion disposed outside the housing. A dichroic mirror that separates at least one light source and light emitted from the light source by R, G, and B, and selectively turns on / off the light output from the dichroic mirror, and rotates and moves in a predetermined axial direction An image projection apparatus using a liquid crystal cell and a projection lens structure capable of The liquid crystal cell and the projection lens structure, R, G and B liquid crystal cell; A polarization beam splitter for synthesizing only two images selected from the R, G, and B images generated by the R, G, and B liquid crystal cells; Two liquid crystal cells selected from the R, G, and B liquid crystal cells are attached to each other, and a central portion is provided with a window through which light incident on an effective screen portion of each liquid crystal cell to be attached is transmitted, and at a corner thereof, Two first holders having first alignment holes formed through the diameters of the first alignment holes; The remaining liquid crystal cells of the R, G, and B liquid crystal cells are attached to each other, and a central portion is provided with a window through which light incident on the effective screen portion of the liquid crystal cell to be attached is transmitted, and at a corner having a predetermined diameter. A second holder having a second alignment hole formed therethrough; Two agents disposed on the incidence side of the polarizing beam splitter and having first alignment pins protruding to a diameter smaller than the diameter of the first alignment holes and inserted into the first alignment holes of the respective first holders. 1 carrier; A second carrier protruding to a diameter smaller than the diameter of the second alignment hole and having a second alignment pin inserted into the second alignment hole of the second holder; An adhesive for adhering said first holder and said each first carrier, and said second holder and said second carrier; A first projection lens for projecting the image synthesized by the polarization beam splitter onto a screen; And And a second projection lens for directly projecting the remaining images of the R, G, and B images onto the screen. .

Images