JP3070180B2 - Liquid crystal display panel holding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display panel holding device for holding a liquid crystal display panel of a liquid crystal projector.

[0002]

2. Description of the Related Art A liquid crystal projector for projecting and displaying a liquid crystal image on a screen or the like is configured as shown in FIG. 7, for example. Light emitted from a light source 1 is applied to a dichroic mirror 3 via a reflection mirror 2. It has become.

The dichroic mirror 3 separates light (white light) from the light source 1 into a green component and other color components. The green component light reflected by the dichroic mirror 3 is reflected by the reflection mirror 4. After that, the light enters the liquid crystal display panel 5.

The liquid crystal display panel 5 displays a projected image of a green portion on a liquid crystal display. Light of a green component transmitted through the liquid crystal display panel 5 is transmitted through a condenser lens 6 to a dichroic mirror 13. It is designed to be irradiated. On the other hand, light of other color components, that is, blue component and red component, transmitted through the dichroic mirror 3 is irradiated to the dichroic mirror 7.

The dichroic mirror 7 decomposes the transmitted light from the dichroic mirror 3 into a blue component and a red component. The blue component light reflected by the dichroic mirror 7 is incident on the liquid crystal display panel 8. Has become.

The liquid crystal display panel 8 is for displaying a projected image of a blue portion on a liquid crystal display. Light of a blue component transmitted through the liquid crystal display panel 8 is transmitted through the condenser lens 9 to the dichroic mirror 13. It is designed to be irradiated. The light of the red component transmitted through the dichroic mirror 7 enters the liquid crystal display panel 10.

This liquid crystal display panel 10 is for displaying a projected image of a red portion on a liquid crystal display. Light of a red component transmitted through the liquid crystal display panel 10 is transmitted through a condenser lens 11 and further reflected by a reflection mirror 12. After that, the light is irradiated to the dichroic mirror 14.

The dichroic mirror 13 transmits light (green light) transmitted from the liquid crystal display panel 5 to the liquid crystal display panel 8.
The transmitted light (blue light) is color-synthesized, and the light of the green component and the light of the blue component transmitted through the dichroic mirror 13 are applied to the dichroic mirror 14.

The dichroic mirror 14 is configured to transmit the light transmitted from the dichroic mirror 13 to the liquid crystal display panel 10.
And red, blue, and green component lights transmitted through the dichroic mirror 14 enter the projection lens 15 and pass through the projection lens 15 to a screen (not shown) or the like. It is projected.

In such a liquid crystal projector, the liquid crystal display panel is mounted on a fixed plate fixed to the main body housing of the liquid crystal projector in order to match the liquid crystal images displayed on the liquid crystal display panels 5, 8, and 10 on the screen surface. The held panel holder is provided so as to be movable, and the panel holder can be moved along the plate surface of the fixed plate to perform optical axis alignment.

[0011]

However, in the above-mentioned conventional apparatus, a moving mechanism for moving the panel holder along the plate surface of the fixed plate is provided integrally between the fixed plate and the panel holder. The number of parts increases, the manufacturing cost increases, the weight increases, and it is difficult to carry easily.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to eliminate the need to provide a moving mechanism between a fixing plate and a panel holder, thereby reducing the number of parts and the weight. It is an object of the present invention to provide a liquid crystal display panel holding device capable of performing the above.

[0013]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a fixing plate fixed to a main body housing of a liquid crystal projector and having a light transmitting window at a central portion, and a fixing plate extending in a direction along the plate surface. A panel holder for slidably holding the liquid crystal display panel; and fixing means for fixing the panel holder to the fixing plate, wherein the panel holder is a top plate of the main body housing. It has an upper end which projects from the upper end
The detachable positioning device is engaged with the engaging part provided in the part.
It is determined by the positioning.

[0014]

According to the present invention, a moving mechanism is provided between the fixed plate and the panel holder by providing an engaging portion for engaging with the positioning device at the upper end of the panel holder protruding from the top plate of the main body housing. This eliminates the need and reduces the number of parts and weight.

[0015]

1 to 5 show an embodiment of the present invention. FIG. 1 is an exploded perspective view of a liquid crystal display panel holding apparatus according to an embodiment of the present invention, and FIG. 2 is a side view of the same. FIG. 3 is a plan view of the same device, FIG. 4 is a front view of the same device as viewed from the exit surface side, and FIG. 5 is a front view of the same device as viewed from the incident surface side.

In FIGS. 1 to 5, reference numeral 20 denotes a fixing plate which is vertically fixed to the main housing of the liquid crystal projector. The fixing plate 20 is formed of one metal plate, and chassis fixing pieces 20a and 20b which are screwed to the bottom plate 21a and the top plate 21b of the main body housing are bent at the lower end and the center of the upper end. It is formed, and a light transmission window 21 is formed in the center.

On one surface of the fixed plate 20, a panel holder 23 for holding the liquid crystal display panel 22 is provided slidably in a direction along the plate surface of the fixed plate 20. The panel holding body 23 is composed of two panel holding plates 24 and 25 having light transmitting windows 26 and 27 at the center. The panel holding plate 24 and the panel holding plate 25
The lower edge portions are fitted together by fitting the pin 28 and the pin fitting hole 29 together, and the upper edge portions are fastened together by screws 30 to be combined.

The panel holding member 23 is disposed with its panel holding plate 24 facing the fixing plate 20. At a plurality of positions (three in this embodiment) of the panel holding plate 24, It is slidably supported in the direction along the plane.

Referring to FIG. 1, reference numeral 31 denotes a support screw for supporting the panel holding plate 24 on the fixing plate 20, and reference numeral 32 denotes a fixing plate. The square-shaped screw through holes 33 are screw holes provided in the panel holding plate 24 corresponding to the screw through holes 32, respectively.
It is formed in an area sufficiently larger than the thickness of 1.

Reference numerals 34 and 35 denote a pair of sliding washers for holding the screw through hole forming portion of the fixing plate 20 from both sides thereof. The sliding washers 34 and 35 are made of a low friction resin.

The support screw 31 has one sliding washer 34 and a screw through hole 32 of the fixing plate 20.
And the other slide washer 35 and the panel holding plate 2
4 is screwed into the screw hole 33 of the panel holding plate 24.
Means that the tightening force of the support screw 31 is
Adjustment is made to such an extent that sliding between the fixing plates 20 and 4 and 35 is allowed, and the panel holding plate 24 is brought into contact with the fixing plate 20 via the slide washer 35 with a contact pressure that does not cause “rattle”. The fixing plate 20
Are slidably supported in all directions along the plate surface.

In FIG. 1, reference numeral 36 denotes two fixing screws for fixing the panel holding plate 24 to the fixing plate 20. The fixing screws 36 are provided on both sides of the upper end of the fixing plate 20 by screw holes. It is screwed through holes 37 into screw holes 38 provided on both sides of the upper end of the panel holding plate 24. The fixing screw 36 is tightened after the panel holder 23 is slid along the plate surface of the fixing plate 20 to perform optical axis alignment described later. The screw through hole 37 is formed to have a diameter sufficiently larger than the fixing screw 36 so as not to hinder the slide of the panel holder 23, and the head of the fixing screw 36 has a large diameter washer 39.
And is in contact with the fixing plate 20 via the.

A plurality (three in FIG. 3) of polarizing plate support posts 40 are projected from front and rear surfaces of the panel holding member 23, that is, outer surfaces of the panel holding plates 24 and 25, respectively. On the outer surface of the plate 25, a plurality (three in the figure) of lens support posts 41 project from the polarizing plate support posts 40 at different positions.

The polarizing plate support post 40 of the panel holding plate 24 protrudes to the opposite surface side of the fixed plate 20 through a square-shaped relief hole 42 provided in the fixed plate 20. The escape hole 42 is formed to have a sufficiently larger area than the polarizing plate support post 40 so as not to hinder the slide of the panel holder 23.

A polarizing plate support frame 44 for supporting the incident-side polarizing plate 43 is attached to the leading end of the polarizing plate support post 40 provided on the panel holding plate 24 while being separated from the fixed plate 20. The polarizing plate support frame 44 has its back surface supported by the distal end surface of the polarizing plate support post 40, and is screwed into the polarizing plate support post 40 through an arc-shaped hole 45 provided in the polarizing plate support frame 44. It is fastened and fixed to the polarizing plate support post 40.

The incident side polarizing plate 43 is attached to the polarizing plate support frame 44 by a polarizing plate pressing plate 47 and its fastening screw. The polarizing axis (transmission axis or absorption axis) of the incident side polarizing plate 43 is provided. ) Is the direction of the polarizing plate support frame 4.
4 is fixed to a predetermined direction by loosening the screw 46 fixing the post 4 to the post 40, and rotating the polarizing plate support frame 44 in the circumferential direction.

On the other hand, a polarizing plate support frame 49 for supporting the output-side polarizing plate 48 is attached to the leading end of the polarizing plate support post 40 provided on the panel holding plate 25 while being separated from the panel holding plate 25. ing. This polarizing plate support frame 49
Is a polarizing plate support frame 44 that supports the incident side polarizing plate 43.
The polarizing plate support frame 49 also has its back surface supported by the leading end surface of the polarizing plate support post 40 and has an arc-shaped hole 50.
The part is screwed and fixed to the polarizing plate support post 40 by a screw 51.

The output-side polarizing plate 48 is attached to the polarizing plate support frame 49 by a polarizing plate pressing plate 52 and its fastening screw. The direction of the polarization axis of the output-side polarizing plate 48 is also changed by the polarizing plate. The support frame 49 is adjusted in a predetermined direction by rotating and adjusting the support frame 49 in the circumferential direction.

Further, the tip of the lens support post 41 is loosely fitted into an arc-shaped post through hole 53 provided in the polarizing plate support frame 49, and the tip of the lens support post 41 has a liquid crystal display panel. A lens frame 55 holding a condenser lens 54 for narrowing a light beam transmitted through 22 is attached.

The panel holding plate 2 of the panel holding body 23
The upper end portions of the panel holding plates 24 projecting from the top plate portion 21b of the main body housing have engagement holes 56a, 56b for adjusting the optical axis. Are formed. These engagement holes 5
The engagement pins 83a and 83b of the positioning jig 70 shown in FIG. 6 are engaged with 6a and 56b, so that the position of the liquid crystal display panel 22 can be adjusted using the positioning jig 70. Has become.

As shown in FIG. 6, the positioning jig 70 is provided with the fixing plate 20 or the top plate 21 of the main body housing.
b, and a jig base 71 fixed to
A first moving plate 73 rotatably supported by a fixed shaft 72 protruding from a base surface of the first moving plate 73, and circles engaging with engaging pins 74a, 74b protruding from the first moving plate 73. A second moving plate 76 having arcuate engaging holes 75a and 75b, and arcuate engaging holes 78a and 78b engaging with engaging pins 77a and 77b protruding from the second moving plate 76, respectively. A third moving plate 79 having a plurality of arc-shaped engaging holes 81a, which engage with engaging pins 80a, 80b protruding from the third moving plate 79, respectively.
A jig upper plate 82 having a first movable plate 7
3, engaging pins 83a, detachably engaging with engaging holes 56a, 56b formed at the upper end of the panel holding plate 24;
83b is protruded.

The second moving plate 76 and the third moving plate 79 are provided with moving screws 84 and 85, respectively.
By rotating these moving screws 84 and 85, the first moving plate 73 moves in the axial direction of the moving screws 84 and 85. Further, the jig upper plate 82 is provided with an angle worm 87 that engages with a gear portion 86 formed on the third moving plate 79. When the angle worm 87 is rotated, the first moving plate 73 is moved. Rotate about a fixed shaft 72.

In this embodiment configured as described above, the panel holder 23 for holding the liquid crystal display panel 22 is provided movably in the direction along the plate surface of the fixed plate 20.
Engagement holes 56a, 56b which engage with positioning jig 70 at the upper end of panel holding plate 24 constituting panel holding body 23.
Is provided, the positioning of the liquid crystal display panel 22 can be easily performed by the positioning jig 70. Therefore, there is no need to provide a moving mechanism between the fixing plate 20 and the panel holder 23 as in the related art, and the number of parts and the weight can be reduced.

In this embodiment, the engagement holes 56a, 56b
Is provided at the upper end of the panel holding plate 24 protruding from the top plate 21b of the main body housing, so that the alignment of the liquid crystal display panel 22 can be performed from outside the main body housing. Since it is not necessary to attach the top plate portion 21b of the main body housing after the positioning of the top plate 22, the top plate portion 21b of the main body housing is not required.
The position of the liquid crystal display panel 22 does not shift when b is attached. The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0035]

As described above, the present invention relates to a fixed plate fixed to a main body housing of a liquid crystal projector and having a light transmitting window at a central portion, and a liquid crystal provided slidably in a direction along the plate surface of the fixed plate. A panel holder for holding the display panel, and fixing means for fixing the panel holder to the fixing plate,
The panel holder is provided from a top plate of the main body housing.
An engaging portion provided on the upper end portion, the upper end portion having a projecting end;
Is positioned by engaging a removable positioning device
Things. Therefore, there is no need to provide a moving mechanism between the fixing plate and the panel holder, and it is possible to provide a liquid crystal display panel holding device capable of reducing the number of components and the weight.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a liquid crystal display panel holding device according to an embodiment of the present invention.

FIG. 2 is a side view of the device.

FIG. 3 is a plan view of the same device.

FIG. 4 is a front view of the same device as viewed from an emission surface side.

FIG. 5 is a front view of the apparatus as viewed from the incident surface side.

FIG. 6 is an exploded perspective view of a positioning jig.

FIG. 7 is a diagram showing a schematic configuration of a liquid crystal projector.

[Explanation of symbols]

Reference numeral 20: fixing plate, 22: liquid crystal display panel, 23: panel holding body, 24, 25: panel holding plate, 56a, 56
b ... engagement hole.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-195382 (JP, A) JP-A-3-293390 (JP, A) JP-A-2-113774 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) G02F 1/13 G02F 1/1333 G02F 1/1335

Claims (1)

(57) [Claims] 1. A fixing plate fixed to a main body housing of a liquid crystal projector and having a light transmitting window in a central portion, a panel holder slidably provided in a direction along a plate surface of the fixing plate and holding a liquid crystal display panel. , the panel holder made by and a fixing means for fixing to the fixing plate, the panel holding member has an upper portion projecting from the top plate portion of the main body housing, on the
A detachable positioning device is provided for the engaging portion provided at the end.
LCD panel characterized by positioning
Holding device.