JP2001166380A - LCD projector - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To make it possible to correct a trapezoidal image projected up and down by a liquid crystal projector and to make it possible to change lenses from the front without disassembling the set body, and to use existing cinema lenses and anamorphic To provide a device that allows a lens or other lens to be mounted. A lens is moved up and down by rotating a knob (17) on the upper part of the main body of the liquid crystal projector to the left and right, and lens exchange is performed by rotating an inner barrel (8) from the front of the main body box and removing a screw fastening. A configuration in which the lens holding member 9 is detached from the outer cylindrical portion 9-2, and a configuration in which the lens holding member is divided into three and the intermediate member has a role of an adapter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal projector for enlarging and projecting an image of a liquid crystal panel, and more particularly, to easily changing a projection lens while moving the projection lens up and down to move the position of the projection image. The present invention relates to a liquid crystal projector. In addition, the present invention relates to a liquid crystal projector that can perform projection using a projection lens for movie film.

[0002]

2. Description of the Related Art Conventionally, projectors for enlarging and projecting an image on a liquid crystal panel using a light source such as a metal halide have been released. In this projector, light emitted from a light source is condensed on a liquid crystal panel via a mirror or the like, and an image of the liquid crystal panel is projected on a screen through a projection lens.

In general, if the center of the liquid crystal panel and the lens optical axis are the same, the projector will match the center of the projected image projected on the screen with the lens optical axis center. When the projection lens is shifted upward with respect to the liquid crystal, the projection image projected on the screen shifts upward.

[0004] Usually, when using the projector, the projector is placed on a desk. In that case, it is easier to see the image projected by the projector if the center of the projected image is above the desk. Accordingly, the front legs of the projector main body are raised so that the projected image is above the desk. in this case,
The projected image is distorted into a trapezoid. As a method of preventing this, the projector is often designed so that the lens optical axis and the axis of the center of the liquid crystal surface can be shifted.

When the projector is placed on the floor, the projected image is generally shifted upward from the optical axis of the lens, and when the projector is suspended from the ceiling, the projected image is shifted downward.

A conventional mechanism for moving the optical axis of a lens is shown in FIGS. FIG. 13 is a perspective view of Japanese Patent Publication No. 5-
This is a mechanism disclosed in Japanese Patent No. 27324. This lens moving mechanism is configured to move the condensing lens 52 and the projection lens unit 53 attached to the arm 54 in the vertical direction by rotating the screw shaft 55, so that the optical axis is shifted from the center axis of the liquid crystal panel 51. Have been.

FIG. 14 is a side view of Japanese Patent Publication No. 8-1.
This is a mechanism disclosed in Japanese Patent No. 60488. This lens moving mechanism attaches the projection lens 61 to a pantograph mechanism combining an operation link 62 and a link 63,
By rotating a gear 64 meshed with the operation link 62, the projection lens 61 is translated in the vertical direction.

The inventor has proposed a configuration in which the mechanism is simplified in JP-A-10-171444.
The projection lens proposed in this publication is generally 1.5 m
It is standard to project a 40-inch (approximately 1.0 m) size projected image on a screen at a projection distance of 2 m from the screen. (Hereinafter referred to as a standard lens.) Generally, when a projector is used, the projector is installed at an appropriate position according to the distance to the screen. However, depending on the environment in which it is used, it may need to be installed at a short distance, or may have to be installed at a long distance. In this case, it is necessary to replace the projection lens according to the installation distance. However, in the projector proposed in Japanese Patent Application Laid-Open No. 10-171444, when replacing the standard lens, it was necessary to open the cabinet, remove the contents to the extent that the lens can be replaced, and replace it. The replacement was complicated and time-consuming.

Recently, the brightness of projectors has been increasing. As a projection lens, there is an increasing demand for a long focal length lens for projecting a projection image of a fixed size at a long distance from a large hall from behind and a short focal length lens for projecting a short distance such as a home theater. A projector using these lenses is desired. In addition, the projector is required to be able to exchange these projection lenses according to the projection distance of the hole used by the projector and the screen size, and to be able to change the optical axis position of the lens by the lens shift mechanism. ing.

All three-panel or single-panel liquid crystal projectors having a lens shift mechanism are designed with the lens optical axis shifted from the axis of the center of the liquid crystal plane. For example, the projector proposed above has a complicated mechanism for shifting the lens,
The number of parts was large and the cost was high. In addition, it is difficult to increase the amount of movement (shift) of the projector proposed above, and the shift amount is incomplete. (See: Figure 1
3,14)

[0011]

As described above, in the liquid crystal projection device, in order to make a projector using a long focus lens or a short focus lens, it is necessary to prepare a special long focus / short focus lens suitable for an optical unit in advance. there were. (In many cases, where the projector is used, the mounting position of the projector and the screen position are set. For example, when the projector is suspended from the ceiling, the distance to the screen and the position of the ceiling bracket are determined. First, when I actually attached the projector, I shifted the lens up and down for alignment, but if the projection distance was not the same, I needed to replace the standard lens with another lens.) In that case, lens replacement was very difficult. Further, in order to cope with a place such as a movie theater where the projector and the screen are set at predetermined positions and sizes in advance, it is necessary to prepare a great number of types of projection lenses. In order to cope with such users, the market demands that a projection lens for a conventional projector can be shared.

[0012]

In order to solve the above problems, a liquid crystal projector according to the present invention comprises a light source, a group of mirrors for separating and synthesizing color light from the light source, and a liquid crystal for controlling transmission of the color light. A lens holder having an opening slidably movable up and down, a shift rod rotatably attached to the lens holder, and the shift rod including the liquid crystal, the mirror group, the lens holder, and the shift rod. A main body box in which a first hole is provided in the vicinity of an upper portion and a second hole is provided in a position opposite to the opening formed in the lens holding portion, and the transmitted light image by the liquid crystal is enlarged. The lens unit is detachable by inserting and rotating the lens unit through the second hole of the main body box into the opening of the lens holding unit.

As described above, the lens holding section includes the fixing section for fixing the end of the projection lens section, the fitting section for slidably fitting, and the nut section for meshing with the screw section of the shift rod.

The projection lens unit includes a plurality of lens barrels and a plurality of lenses, and constitutes a fixing unit for fixing the lens holding unit to one of the lens barrels.

By adopting this structure, the liquid crystal projector of the present invention can shift the projection lens unit up and down, and can exchange the projection lens unit with one touch from the front of the main body box.

The lens holding portion has a contact portion to be fitted to the fitting portion and is slidably held by an optical base for fixing the liquid crystal. By rotating the shift bar, the lens holding portion is vertically held while holding the projection lens portion. It was configured to slide.

Furthermore, the liquid crystal projector of the present invention
By making the projection lens unit detachable from the second hole of the main body box, it is possible to replace the projection lens unit and shift the projection lens unit up and down without removing the main body box.

Further, the liquid crystal projector of the present invention
By integrating the projection lens unit and removing the projection lens unit from the optical base, the above structure is achieved with little cost and without increasing the number of parts.

According to the present invention, when the standard lens is exchanged, it is not necessary to remove the main body box every time the standard lens is exchanged and to remove the contents to the extent that the lens exchange is possible.

Further, even when the mounting position of the projector and the screen position are set, the lens is shifted up and down so as to prevent trapezoidal distortion caused by tilting the projector, and the projection distance is maintained. If not, the standard lens can be replaced with another lens.

[0021]

FIG. 1A is a plan view of an optical system of a liquid crystal projector according to a first embodiment of the present invention. FIG. 1B is a front view of FIG. FIG.
FIG. 1 is a perspective view showing details of a projection lens barrel and a mounting portion thereof according to a first embodiment of the present invention. FIG. 3 is a perspective view showing an assembled state in which the outer lens barrel and the main body lens barrel of the lens optical system of FIG. 2 are integrated, and particularly shows a state where the lens is shifted downward. FIG. 4 is a schematic diagram illustrating a projection image in a state where the projection lens unit in FIG. 2 is shifted downward. FIG. 5 (A)
Is an external perspective view of the main body box, showing a state where the rotary knob is retracted. FIG. 5B is a perspective view showing a state in which the rotary knob of FIG. 5A has protruded. FIG. 6 is an exploded perspective view showing a state before the projection lens unit according to the first embodiment of the present invention is attached to the lens holding unit. FIG. 7 is a perspective view showing a state in which the projection lens unit of the first embodiment of the present invention is attached to a lens holding unit. FIG. 8 is a perspective view showing details of a projection lens barrel and a mounting portion thereof according to a second embodiment of the present invention. FIG. 9A is a side view (partial sectional view) of FIG. 8 before the projection lens unit is inserted into the lens holding unit.
FIG. 9B is a side view (partially sectional view) of FIG. 8 in which the projection lens unit is inserted into the lens holding unit. FIG. 10 (A)
FIG. 9 is a side view (partially sectional view) of a third embodiment of the present invention, showing a state before a projection lens unit is inserted into a lens holding unit. FIG. 10B is a side view (partially sectional view) in which the projection lens unit of FIG. 10A is inserted into a lens holding unit. FIG.
FIG. 9 is an exploded perspective view showing a lens unit according to a fourth embodiment of the present invention. FIG. 12 is an exploded perspective view in which another lens part of the lens part of FIG. 11 is added. FIG. 13 is an external perspective view of a conventional liquid crystal projector. FIG. 14 is a side view of a projection lens unit in another conventional liquid crystal projector.

A liquid crystal projector according to the present invention will be described below with reference to FIGS.

(First Embodiment) FIGS. 1A and 1B
As shown in FIG. 1, the three-panel liquid crystal projector includes a lamp (light source) 1, a plurality of mirrors 2, a liquid crystal panel 3, a prism 4, a projection lens unit 5, an optical base, and the like, and a main body box 6 for housing these components. Make up. With this configuration, the light from the lamp (light source) 1 is separated into red, green, and blue light by using a plurality of mirrors 2, made incident on the liquid crystal panel 3, synthesized by the prism 4 and the like, and enlarged and projected by the projection lens unit 5. I do.

As shown in FIG. 2, the projection lens unit 5 includes a plurality of barrels 7 (outer barrel), a barrel 8 (inner barrel), and a plurality of lenses (not shown). The inner barrel 8 has a screw portion 8-1.

The optical base includes a holding base 11 disposed in an L shape so as to be orthogonal to the prism base 10, and auxiliary plates 12 disposed on the left and right sides of the holding base 11. The optical base fixes the liquid crystal panel 3. 2 and 3
As shown in FIG. 1, the lens holding unit 9 includes a holding base 11 of an optical base and the auxiliary plates 1 disposed on the left and right of the holding base 11.
2 guides and is held so as to be slidable up and down.
An outer cylindrical portion 9-2 having an opening is integrally formed with the lens holding portion 9. The projection lens unit 5 is held on the female screw portion 9-1 provided on the outer cylinder portion 9-2 by rotating the male screw portion 8-1 of the inner lens barrel 8.

In FIG. 2, the female screw part 9-1 is connected to the outer cylindrical part 9
-2, and the external thread 8-1 is formed on the outer surface of the inner lens barrel 8. However, the screw part 9-1 is connected to the outer cylinder part 9-2.
The same effect can be obtained even if the screw portion 8-1 is formed on the inner surface of the inner lens barrel 8.

A bearing 14 is integrally provided at one upper end of the holding base 11, and a shift rod 15 is rotatably attached to the bearing 14. The shift bar 15 has a rotation knob 17 (knob) on the upper end side and a screw portion 16 on the other end side. The screw portion 16 is screwed with the nut portion 13 provided integrally with the lens holding portion 9, and the lens holding portion 9 and the projection lens portion 5 are integrated with each other in response to turning the shift rod 15 right and left. To move up and down.

As shown in FIGS. 5A and 5B, the top of a rotary knob 17 (knob) provided at the upper end of the shift rod 15 is provided with a hole 18 provided on the top surface of the main body box 6. As if entering and exiting. The height of the top of the rotary knob 17 is usually set to be substantially the same as the top surface of the main body box 6.
The protruding and retracting mechanism of the rotary knob 17 is a commercially available protruding and retractable switch, the details of which are omitted. By pressing the rotary knob 17 once, the rotary knob 17 can be protruded from the top surface to be able to grip and rotate, and by pressing the rotary knob 17 again, it is lowered to return to the original state and maintain. The so-called rotary knob 17 employs a push-push type knob configuration (projection and retraction method).

The holding base 11, the auxiliary plate 12, and the prism base 10 are formed as an integral structure by aluminum die casting or molding resin. Lens holding part 9 and outer cylinder part 9-
Similarly, the nut 2 and the nut portion 13 are formed as an integral structure. 3 and 5B show a state where the projection lens unit 5 is lowered most. The relative shift amount between the center of the liquid crystal panel 3 and the longitudinal axis of the projection lens unit 5 is as follows when the liquid crystal panel 3 is 1.3 inches (about 32.5 mm).
The upper and lower movable ranges are set to about 20 mm. That is, the shift amount is configured to be movable by about 10 mm in each of the upper and lower directions centering on the case where the center of the liquid crystal panel 3 and the longitudinal axis of the projection lens unit 5 coincide. Therefore, this configuration makes it possible to shift the center of the liquid crystal panel 3 from the longitudinal axis of the projection lens unit 5. FIG. 4 is a diagram schematically showing an image projected on the screen 20 with the projection lens shifted downward.

As described above, the liquid crystal projector of the present invention can easily raise and lower the projection lens up and down with a simple configuration.

When replacing the projection lens with another one, rotate the lens from the front and remove the screw fastening.
The projection lens can be replaced with a projection lens having a screw portion at another predetermined position.

(Second Embodiment) The second embodiment relates to a bayonet structure for holding a projection lens unit in a lens holding unit. That is, similarly to the first embodiment, a configuration in which the projection lens unit is inserted from the front surface of the main body box and the projection lens unit can be fixed by a half turn is shown. A second embodiment will be described with reference to FIGS. 8, 9A and 9B. The reference numerals denoting the components of the present embodiment denote the same components having the same functions as those of the first embodiment.
An outer cylindrical portion 39-2 having an opening is integrally formed with the lens holding portion 39. The outer lens barrel 39-2 is slidable with an insertion opening 39-3 for inserting a projection lens unit, a fixing unit 39-4 for rotating and fixing the projection lens unit at a fixed angle, and a stopper mechanism 32 for preventing the projection lens unit 305 from coming off. A fitting portion 39-5 to be fitted is configured. As shown in FIGS. 8 and 9, a plurality of collars 38-2 are formed around an end of the projection lens unit 305 facing the lens holding unit 39 of the lens barrel 38.
The brim 38-2 is inserted into the insertion opening 39-3 of the lens holding portion 39, and is fixed when turned by a predetermined angle.
In the present embodiment, the stopper mechanism 32 has an example of a configuration shown by a rotation knob and a shaft for vertically moving the lens holding unit shown in the first embodiment. FIG. 5 showing the first embodiment.
As in (A) and FIG. 5 (B), the top of the rotary knob 37 (knob) provided at the upper end of the shift bar 35 enters and exits another hole provided on the top surface of the main body box 6. (Not shown). Similarly to the rotary knob 17 of the first embodiment, the height of the top of the rotary knob 37 is usually set to be substantially the same as the top surface of the main body box 6 (not shown). The protruding and retracting mechanism of the rotary knob 37 is a commercially available protruding and retractable switch, and the details are omitted. Then, by pressing the rotation knob 37 once, it can protrude from the top surface and can be gripped and rotated, and fix the projection lens unit as shown in FIG. 9 (B). By pressing the rotary knob 37 again, it descends and returns to its original state and maintains it. The so-called rotation knob 37 employs a push-push type knob configuration (projection and retraction method). In this embodiment, a mechanism for fixing the rotary knob 37 by rotating the rotary knob 37 is used, but the mechanism is not particularly limited.

The lens holding portion 39, the outer cylindrical portion 39-2, and the nut portion 33 are similarly formed as an integral structure.
Also, in the present embodiment, similarly to the first embodiment,
The lens holding unit 39 and the projection lens unit 35 move up and down (up and down) as a unit as the shift bar 15 is rotated left and right.

(Third Embodiment) The third embodiment relates to a structure for holding a projection lens unit on a lens holding unit. That is, similarly to the first embodiment, a configuration is shown in which the projection lens unit is inserted from the front of the main body box and fixed by the stopper mechanism. FIGS. 10A and 10B show a third embodiment.
This will be described with reference to FIG. The reference numerals denoting the components of the present embodiment denote the same components having the same functions as those of the first embodiment. An outer cylindrical portion 59-2 having an opening is integrally formed with the lens holding portion 59.
An insertion opening 59 for inserting a projection lens unit into the outer lens barrel 59-2.
-3, a stopper mechanism 32 for preventing the projection lens unit 505 from coming off, and a fitting portion 59-5 for slidably fitting. As shown in FIGS. 10A and 10B, the lens holding portion 59 of the lens barrel 58 of the projection lens portion 505
The cylindrical portion 58-2 is provided at the end facing the.
The cylindrical portion 58-2 is provided with an insertion opening 59-3 of the lens holding portion 59.
And fixed by the stopper mechanism 32 shown in the second embodiment. That is, a mechanism for fixing the rotary knob 37 by rotating the rotary knob 37 is used, but the mechanism is not particularly limited.

The lens holder 59, the outer cylinder 59-2 and the nut 53 are similarly formed as an integral structure.
Also, in the present embodiment, similarly to the first embodiment, the lens holding unit 59 and the projection lens unit 505 move up and down (up and down) integrally as the shift bar 15 is rotated left and right. .

(Fourth Embodiment) A fourth embodiment of the present invention relates to a liquid crystal projection apparatus which can project an image using a projection lens for a movie film projector.
The projection lens for the projector is fixed at a fixed distance from the image film, and enlarges and projects the image of the film on the screen. A fourth embodiment will be described with reference to FIG. 11 and FIG. The reference numerals denoting the components of the present embodiment denote the same components having the same functions as those of the first embodiment. FIG. 11 is an exploded perspective view showing a lens portion of a fourth embodiment of the present invention, and FIG. 12 is an exploded perspective view showing a configuration in which an anamorphic lens is integrated with FIG.

The one corresponding to the projection lens unit 5 in FIG.
This is the projection lens 705 shown in the fourth embodiment. In the fourth embodiment, a middle cylinder 71 is provided between the outer lens barrel 9-2 of the lens holder 9 and the projection lens 705. The holding base 11 has an outer lens barrel 9-2 integrated with the same lens holding portion 9 as in FIG. The inner cylinder 71 is held by the outer lens barrel 9-2 by screwing the female screw 70a and the male screw 71a. The projection lens 705 is held by the middle cylinder 71 by screwing the female screw 71b and the male screw 72a. The diameter of the screw 71b of the middle cylinder 71 matches the diameter of the screw 72a of the projection lens 705. The diameter of the screw 72a of the projection lens 705 is 62.5 mm,
There are three types, 70.6 mm and 71.8 mm. Therefore, the diameter of the screw 71b of the middle cylinder 71 is prepared according to the screw 72a, namely, 32.5 mm, 70.6 mm, and 71.8 mm. The aspect ratio of the liquid crystal panel is 4: 3.
It is. The image on the liquid crystal panel is enlarged by the projection lens unit. The aspect ratio of the image projected on the screen is also 4:
3. The aspect ratio of the image projected on the screen is
It may be requested to be able to change according to the size of the screen. For example, the projection lens 705 is provided with an aspect ratio of 4: 3 for the liquid crystal panel, an HD size of 16: 9, a cinema size,
A configuration that enlarges only in the horizontal direction, such as a Vista size, is desired. FIG. 12 shows a configuration corresponding to this. That is, when changing the aspect ratio, as shown in FIG. 12, the anamorphic lens unit 7 composed of a cylindrical lens or the like is used.
3 was attached to the projection lens 705. More specifically, the anamorphic lens 73 is attached to the tip of the projection lens 705 by fitting or screwing. As described in the fourth embodiment, by attaching the projection lens 705 to the lens holding unit 9 of the liquid crystal projector via the middle cylinder 71, the projector and the screen are set at predetermined positions and sizes in advance. It is possible to respond to places such as movie theaters. Further, it is possible to use the anamorphic lens 73 to perform projection according to the screen. In the above configuration, the lens addition, replacement work, etc. are performed by rotating the lens holding cylinder from the front side without disassembling the main body,
The lens holding tube can be attached and detached.

In the present embodiment, the fixing of the middle cylinder 71 and the lens holder 9 is described in the configuration of the first embodiment. However, the configuration shown in the second or third embodiment may be used. Needless to say. Similarly to the first embodiment, the lens holding unit and the projection lens unit move up and down (up and down) as a unit in response to turning the shift bar 15 right and left.

[0039]

As described above, according to the projector of the present invention, the projection lens can be moved up and down by rotating the shift rod. Further, with the vertical mechanism held, an arbitrary projection lens exchange such as a long focal length or a short focal length can be inserted into the cylinder with a single touch from the hole of the front cover. There is no need to remove cases as in conventional projectors. In addition, the mechanism for this up-down shift and lens exchange is very simple and can be realized at low cost.

[Brief description of the drawings]

FIG. 1A is a plan view of an optical system of a liquid crystal projector according to a first embodiment of the present invention. FIG. 1B is a front view of FIG. 1A.

FIG. 2 is a perspective view showing details of a projection lens barrel and a mounting portion thereof according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing an assembled state in which the outer lens barrel and the main body lens barrel of the lens optical system of FIG.

FIG. 4 is a schematic diagram showing a projection image in a state where the projection lens unit in FIG. 2 is shifted downward.

5A is an external perspective view of the main body box showing a state in which the rotary knob is retracted, and FIG. 5B is a perspective view showing a state in which the rotary knob in FIG.

FIG. 6 is an exploded perspective view showing a state before the projection lens unit according to the first embodiment of the present invention is attached to the lens holding unit.

FIG. 7 is a perspective view showing a state in which the projection lens unit according to the first embodiment of the present invention is mounted on a lens holding unit.

FIG. 8 is a perspective view showing details of a projection lens barrel and a mounting portion thereof according to a second embodiment of the present invention.

9A is a side view (partial cross-sectional view) of FIG. 8 before the projection lens unit is inserted into the lens holding unit. FIG. 9B is a side view (partial cross-sectional view) of FIG. Figure inserted into the lens holder

10A is a side view (partial cross-sectional view) of a third embodiment of the present invention before a projection lens unit is inserted into a lens holding unit. FIG. 10B is a diagram showing a state in which the projection lens unit of FIG. Side view (partial sectional view) inserted into the part

FIG. 11 is an exploded perspective view showing a lens unit according to a fourth embodiment of the present invention.

FIG. 12 is an exploded perspective view in which another lens part is added to the lens part of FIG. 11;

FIG. 13 is an external perspective view of a conventional liquid crystal projector.

FIG. 14 is a side view of a projection lens unit in another conventional liquid crystal projector. FIG. 14 is a perspective projection view showing an entire embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 light source 2 mirror 3 liquid crystal panel 5 projection lens 6 main body box (housing) 7 lens barrel 8 inner lens barrel 9 support plate 11 holding base 20 screen 9-2 outer lens barrel 71 middle cylinder 73 anamorphic lens 705 projection lens

Claims (16)

[Claims] 1. A light source, a mirror group for separating and synthesizing color light from the light source, a liquid crystal for controlling transmission of the color light, and a projection lens unit attaching / detaching mechanism movable up and down while holding the projection lens unit. A liquid crystal projector comprising a lens holder and a shift rod rotatably attached to the lens holder. 2. A first hole portion including the liquid crystal, the mirror group, the lens holding portion, and the shift bar, and having a first hole protruding from the shift bar near an upper portion of the shift bar. 2. The liquid crystal projector according to claim 1, wherein said liquid crystal projector comprises a main body box provided with a second hole portion detachable from said lens holding portion. 3. The liquid crystal projector according to claim 2, wherein a projection lens unit is attached to said lens holding unit. 4. The liquid crystal projector according to claim 1, wherein the projection lens unit is detachable while rotating the projection lens unit from the second hole of the main body box. 5. The lens holding section includes an insertion opening for inserting a projection lens section, a stopper for preventing the projection lens section from coming off, a fitting section slidably fitted, and a screw section of a shift rod. The liquid crystal projector according to claim 1, comprising: 6. The liquid crystal projector according to claim 5, wherein a third hole for operating the stopper for keeping the projection lens from coming off is formed in the main body box. 7. The liquid crystal device according to claim 1, wherein the lens holding portion includes a screw portion that rotates and fixes the projection lens portion, a fitting portion that slidably fits the nut portion, and a nut portion that meshes with a screw portion of the shift rod. projector. 8. The liquid crystal projector according to claim 5, wherein the projection lens unit includes a plurality of lens barrels and a plurality of lenses, and one of the lens barrels has a screw portion fixed to the lens holding unit. 9. A fitting for slidably fitting the lens holding portion with a fixing portion for rotating and fixing a predetermined angle with an insertion opening for inserting the projection lens portion, a stopper for preventing the projection lens portion from coming off. 2. The liquid crystal projector according to claim 1, comprising a joint portion and a screw portion of the shift rod. 10. The liquid crystal projector according to claim 7, wherein one of the lens barrels of said projection lens unit has a plurality of projections which are inserted into an insertion opening of said lens holding unit and fixed by a fixing unit. 11. The lens holding part has a contact part fitted with a fitting part and is slidably held by an optical base for fixing a liquid crystal, and holds the projection lens part by rotating a shift rod while holding the projection lens part. 4. The liquid crystal projector according to claim 3, wherein the projector slides. 12. A second fitting which is fitted into said first cylindrical body with a cavity.
A liquid crystal projector comprising: a cylindrical body, and a projection lens that holds a plurality of lenses for enlarging the liquid crystal. 13. The projection lens has a cylinder diameter of approximately Φ62.5 m.
2. The liquid crystal projector according to claim 1, wherein the lens is a lens for a film projector, which is one of m, Φ70.6 mm, and Φ71.8 mm. 14. The second cylinder has a diameter of approximately 62.5 mm and a diameter of 7 mm.
The liquid crystal projector according to claim 1, wherein the liquid crystal projector is fitted with any one of a cylinder diameter of 0.6 mm and a diameter of 71.8 mm. 15. The liquid crystal projector according to claim 1, wherein an anamorphic lens for freely changing the aspect ratio of the liquid crystal can be attached to the projection lens from outside the case. 16. The liquid crystal projector according to claim 1, wherein the second cylinder and the projection lens are detachably mounted on the first cylinder by rotation.