JP3177344B2 - LCD video projector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical system mounting apparatus for a liquid crystal projector mainly used for business such as a high-definition theater.

[0002]

2. Description of the Related Art A liquid crystal projector usually uses an optical system shown in FIG. The light from the light source (71) passes only visible light through a filter, and is converted into three primary colors of red light (R), green light (G), and blue light (B) by two dichroic mirrors (72) and (73). Separated and liquid crystal light valve (75)
An image is placed on each primary color light by (76) and (77), the three primary color lights are combined by dichroic mirrors (79) and (80), and the combined light is projected by a projection lens (81) and formed on a screen. Image.

As shown in FIG. 11, dichroic mirrors (72), (73), (79), (80) and a liquid crystal light valve (75) of the above-mentioned optical system are located at opposing positions of the front and rear chassis (41), (42). (76) (77)
A plurality of mounting holes (58) for assembling the substantially rectangular optical system insertion window (43) and the chassis (41) (42) in order to insert them into the chassis (41) (42). I have.

The front and rear chassis (41) and (42) are arranged to face each other with a plurality of spacers (19) interposed therebetween, and the front and rear chassis (41) and (4)
Assemble by screwing both ends of the spacer (19) through the mounting hole (58) of 2).

Next, a dichroic mirror of the above optical system
(72) (73) (79) (80) and liquid crystal light valve (75) (76) (77),
They were inserted into the front and rear chassis (41) and (42) through the optical system insertion window (43) and fixed. Further, the outsides of the front and rear chassis (41) and (42) were covered with exterior parts.

[0006]

When the chassis (41) (42) is fixed by the spacer (19), the relative positional relationship between the front and rear chassis (41) (42) can be easily determined at the stage of assembly. It is difficult to accurately assemble the front and rear chassis (41) and (42). In particular, if one or both of the chassis (41) and (42) is warped, or if there is a burr in the mounting hole (58), the spacer (19) may be bent and fixed. At the stage of the rise, the entire chassis (41) (42) was easily distorted. Also, the outside of the front and rear chassis (41) (42)
It was necessary to separately arrange exterior parts for shading.

The present invention provides a simple and highly accurate chassis.
(41) A liquid crystal video projector capable of assembling (42) is disclosed.

[0008]

According to the liquid crystal video projector of the present invention, two chassis (41) and (42) having a positioning mechanism (5) using a mold are arranged to face each other, and the chassis (41) ( Positioning mechanism (2) using a mold that links with the positioning mechanism (5) of (42)
Are arranged at a plurality of required locations between the front and rear chassis (41) and (42) and fixed.

[0009]

[Operation and Effect] The connecting plate (1) having the positioning mechanism (2) engaging with the positioning mechanism (5) of the two chassis (41) and (42) is attached to the front and rear chassis (41) ( Since it is arranged between the two and fixed at the same time as the positioning, the relative positions of the front and rear chassis (41) and (42) at the fixed portion can be accurately determined.

The connecting plate (1) is connected to the front and rear chassis (41) (42).
Multiple front and rear chassis (41) in multiple places between
(42) Since the relative position between them is accurately determined and fixed,
The entire chassis (41) (42) is assembled accurately and the connecting plate
Since light leakage is blocked by (1), no exterior parts for light shielding are required, and cost can be reduced by reducing the number of spacers (19), removing exterior parts for light shielding, and simplifying assembly.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. The optical system of this embodiment and the front and rear chassis (41) (4
The optical system insertion window (43) opened in 2) is shown in FIGS.
Use the same one as shown in.

As shown in FIG. 1, in the present embodiment, upper connecting plates (11), upper, front, lower and rear portions between chassis (41) and (42) are used as connecting plates (1), respectively. The front connecting plate (13), the lower connecting plate (12), and the rear connecting plate (14) were arranged. Each connecting plate (11)
The positioning mechanisms (2) and (5) are formed on the chassis (12), (13) and (14) and the chassis (41) and (42), respectively, as described later.

The connecting plates (11), (12), (13) and (14) and the chassis (4)
1) Since the positioning mechanisms (2) and (5) of (42) are all formed of the same material, the upper connecting plate (11) and the portion A of the chassis (41) (42) in FIG. The positioning mechanisms (2) and (5) are shown in FIGS. 2 to 10 and will be described as a representative.

(Positioning Mechanism of Front Chassis (42)) As shown in FIG. 2, the positioning mechanism (5) of the front chassis (42) includes a horizontal positioning edge (52) and a vertical positioning edge (53) (53). )
And a positioning fixing part (55). The lateral positioning edge (52) is formed on the side surface of a portion vertically protruding from the upper side of the front chassis (42), and this serves as a reference surface in the lateral direction (61), and the upper connecting plate (11) described later. Lateral positioning edge (2
2), the front chassis (42) is positioned relative to the lateral direction (61) of the upper connecting plate (11). The vertical positioning edges (53) and (53) are formed so as to be parallel to the upper side of the front chassis (42), and this serves as a reference plane in the vertical direction (62), and the connecting plate of the upper connecting plate (11) is formed. By contacting the bottom (23) (Fig. 7)
The position of the front chassis (42) with respect to the vertical direction (62) of the upper connecting plate (11) is determined. The positioning fixing part (55) is an extension of the horizontal positioning edge (52) and the vertical positioning edge (5).
3) It is inclined in the diagonal X direction (63), which is oblique to the extension line made by it, and protrudes outward from the front chassis (42). ) Is provided.

(Positioning Mechanism of Rear Chassis (41)) As shown in FIGS. 3 and 4, the positioning mechanism (5) of the rear chassis (41) includes a horizontal positioning edge (51) and a vertical positioning edge (51).
(53) (53) and a positioning and fixing part (54). The lateral positioning edge (51) is formed on the side surface of the protrusion perpendicular to the upper side of the rear chassis (41), and is in contact with a lateral positioning edge (21) (FIG. 6) of the upper connecting plate (11) described later. Contact, upper connecting plate
The rear chassis (41) is positioned in the lateral direction (61) of (11). The vertical positioning edges (53) (53) are
(41) is formed so as to be parallel to the upper side, and by contacting the connecting plate bottom surface (23) (FIG. 5) of the upper connecting plate (11), the upper connecting plate (11) with respect to the longitudinal direction (62). The position of the rear chassis (41) is determined. The positioning fixing part (54) is inclined in an oblique X direction (63) that is oblique to an extension of the horizontal positioning edge (51) and an extension of the vertical positioning edge (53), and is located inside the chassis. It is formed so as to protrude, and a positioning mounting screw hole (56) is provided in the center.

On the other hand, the upper connecting plate (11) has
As shown in the figure, a positioning mechanism (2) for engaging the front chassis (42) (FIG. 2) is provided on the front side, and a positioning mechanism for engaging the rear chassis (41) (FIGS. 3 and 4) is provided on the opposite side. (2) is provided.

(Positioning mechanism for connecting plate) Front chassis (42)
Upper connecting plate (11) engaged with the positioning mechanism (5) of FIG.
The positioning mechanism (2) comprises a lateral positioning edge (22), a positioning fixing part (25) and a fixing part (32). Rear chassis
(41) The positioning mechanism (2) engaging with (FIGS. 3 and 4)
It comprises a lateral positioning edge (21), a positioning fixing part (24) and a fixing part (31).

(Positioning Mechanism of Connecting Plate on Front Chassis (42)) As shown in FIGS. 2, 6, 7 and 10, the lateral positioning edge (22) is located on the upper connecting plate (11). It is located on the side of the protrusion, abuts the lateral positioning edge (52) of the front chassis (42) when assembled, and connects the front chassis (4) to the upper connecting plate (11).
Determine the position in the horizontal direction (61) in 2). Connecting plate bottom surface of the upper connecting plate (11) (23), above the longitudinal positioning edge (53) abuts (53) when was assembled, longitudinal front chassis relative to the upper coupling plate (11) (42) The position of (62) is determined.

In FIG. 10, a circle E is an enlarged portion of the circle D. The positioning fixing part (25) is the upper connecting plate (11)
Of the front chassis (42) is bent perpendicularly so as to be parallel to the front chassis (42) surface, and the tip is further turned back to form a positioning fixing part (25), and the positioning fixing part (55) of the front chassis (42) is formed. ) With a predetermined gap (35). The positioning fixing part (25)
And positioning the mounting holes in the central portion (27) is opened, when was assembled, through the positioning mounting hole (27), is locked screw before the chassis positioning the mounting screw holes (42) (57).

At this time, between the positioning and fixing portions (25) and (55),
Since the predetermined gap (35) exists, the force due to the screwing is applied as a force obliquely pressing the upper connecting plate (11) against the front chassis (42) obliquely in the Y direction (64). The horizontal component to the upper side of the front chassis (42) of the force is
It acts to press the lateral positioning edge (22) of (11) against the lateral positioning edge (52) of the front chassis (42). Further, the component of the force perpendicular to the upper side of the front chassis (42) of the force due to the screwing is the vertical positioning edge (53) of the front chassis (42) with the bottom surface (23) of the upper connecting plate (11). Acts to press against. Therefore, the positional relationship between the upper connecting plate (11) and the front chassis (42) depends on one positioning screw (29), and the lateral positioning edge (22) of the upper connecting plate (11) and the connecting plate bottom (23)
It is fixed exactly on the basis of. After that, the mounting screw (34)
(34), through the mounting holes (58) (58) of the front chassis (42), the positioning fixing part (25) and the fixing part (3) of the upper connecting plate (11).
Securely screw into the mounting screw holes (33) (33) provided in 2).

(Positioning mechanism of the connecting plate on the rear chassis (41)) The lateral positioning edge (21) on the upper connecting plate (11) is, as shown in FIGS. 5, 6, 8 and 9, Located on the side of the small protrusion on the rear chassis (41) side of the upper coupling plate (11), it comes into contact with the lateral positioning edge (51) of the rear chassis (41) during assembly, and the upper coupling plate (11) The rear chassis (4
Confirm the position of 1). Connection plate bottom surface (23) of upper connection plate (11)
The longitudinal positioning edges of the aforementioned time had assembled (53) (53)
To determine the position of the rear chassis (41) in the lateral direction (61) with respect to the upper connecting plate (11).

In FIG. 8, a circle C is an enlarged portion of the circle B. The positioning and fixing part (24) is formed by bending the edge of the upper connecting plate (11) at right angles in the direction of the rear chassis (41) and further folding the tip to form a positioning and fixing part (24).
It faces the positioning fixing part (54) of (41) with a predetermined gap (35). Positioning and fixing unit (24), positioning the mounting holes in the central portion (26) (FIG. 5, FIG. 6) is open, when was assembled, through the positioning mounting hole (26), the rear chassis (41) It is screwed into the positioning mounting screw hole (56).

At this time, between the positioning and fixing parts (24) and (54),
As before, a predetermined gap (35) exists, and the upper connecting plate
Acts exactly the same as in the relationship between (11) and the front chassis (42), with one positioning screw (28)
The positional relationship between (11) and the rear chassis (41) is accurately fixed with reference to the lateral positioning edge (21) of the upper connecting plate (11) and the connecting plate bottom surface (23). Thereafter, the mounting screws (34) and (34) are used to mount the positioning fixing portion (24) and the fixing portion (31) of the upper coupling plate (11) through the mounting holes (58) and (58) of the rear chassis (41). ) Securely screw into the mounting screw holes (33) (33).

That is, the position of the front and rear chassis (41) and (42) in the horizontal direction (61) on the upper side of the front and rear chassis (41) and (42) is determined by the horizontal positioning existing on one upper connecting plate (11). Edge (21) (22)
Is fixed on the basis of On the other hand, 2 on the upper connecting plate (11)
Since the two lateral positioning edges (21) and (22) are formed by the same mold, the horizontal positions of the front and rear chassis (41) and (42) are fixed with mold accuracy. Meanwhile, the front and rear chassis
The vertical position (62) of (41) and (42) with respect to the upper connecting plate (11) is based on the connecting plate bottom surface (23) of the same upper connecting plate (11) in both chassis (41) and (42). , The vertical direction (62) is also positioned with the planar accuracy of the upper connecting plate (11).

As described above, in this embodiment, the same positioning mechanism (5) as described above is mounted on the front and rear chassis (41) and (42).
The lower connecting plate (12), the front connecting plate (13), and the rear connecting plate (14) formed on the side surface and also having the same positioning mechanism (2) as above are placed between the front and rear chassis (41) (42). And fixed on the four sides of the chassis (41) (42) and the connecting plates (11) (12) (13) (1
4) Easy to assemble without distortion. At the same time, each connecting plate
(11) The leakage of light was prevented by the presence of (12), (13) and (14), and exterior parts for light shielding were eliminated. In this embodiment, the connecting plates (1) having the positioning mechanism on both sides are provided at four places.
It may be provided in more than two places.

The description of the above embodiments is for the purpose of illustrating the present invention and should not be construed as limiting the invention described in the appended claims or reducing the scope thereof. Further, the configuration of each part of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made within the technical scope described in the claims.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a liquid crystal video projector of the present invention.

FIG. 2 is an enlarged perspective view of a front chassis (42) and an upper connecting plate (11) of a portion A in FIG. 1;

FIG. 3 is a plan view when the rear chassis (41) of part A in FIG. 1 is tilted forward;

FIG. 4 is a plan view of a rear chassis (41) of a portion A in FIG. 1;

FIG. 5 is a plan view when the upper connecting plate (11) of the portion A in FIG. 1 is set up with its front side down;

FIG. 6 is a plan view of an upper connecting plate (11) of a portion A in FIG. 1;

FIG. 7 is a front view of an upper connecting plate (11) of a portion A in FIG. 1;

FIG. 8 is a chassis (41) after assembling the portion A in FIG. 1;
FIG. 3 is a plan view when the player is tilted inward with the front facing down.

FIG. 9 is an assembled chassis (41) (4) of a portion A in FIG. 1;
It is a top view of 2).

FIG. 10 is a front view of the portion A in FIG. 1 as viewed from the near side.

FIG. 11 is an exploded perspective view of a conventional liquid crystal video projector.

FIG. 12 is an arrangement diagram of an optical system of the liquid crystal video projector.

[Explanation of symbols]

 (1) Connecting plate (2) Positioning mechanism (5) Positioning mechanism (41) Chassis (42) Chassis (72) Dichroic mirror (73) Dichroic mirror (75) Liquid crystal light valve (76) Liquid crystal light valve (77) Liquid crystal light Valve (79) Dichroic mirror (80) Dichroic mirror (81) Projection lens

Claims (1)

(57) [Claims] The light source is a dichroic mirror.
The liquid crystal light valves (75), (76), and (77) are arranged for each of the primary color light paths, and the images are superimposed on each other by the dichroic mirrors (79) and (80). )
In a liquid crystal video projector having an optical system for projecting the optical system, the optical system is arranged in a chassis, and two chassis (41) and (42) having a positioning mechanism (5) using a mold are arranged facing each other. A connecting plate provided on both sides with a positioning mechanism (2) using a mold linked to a positioning mechanism (5) of the chassis (41) (42).
A liquid crystal video projector characterized in that (1) is arranged and fixed at a plurality of required locations between the front and rear chassis (41) and (42), and the front and rear chassis (41) and (42) are accurately assembled.