JP3301971B2 - Light collection unit and projection device provided with the light collection unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projector for projecting an image by irradiating a liquid crystal panel with intense light, and a mechanism for adjusting the liquid crystal panel used in the projector.

[0002]

2. Description of the Related Art Conventionally, three primary colors of light, R, G, B
It is equipped with three liquid crystal panels (7), (7a) and (7b) corresponding to, irradiates them with strong light from a light source (35), and synthesizes a light flux modulated by passing through the liquid crystal panel to form an image. There has been proposed a liquid crystal projector that projects the image. FIG. 6 is a plan view of the projection device. In the chassis (3), liquid crystal panels (7a) and (7b) corresponding to R and B sandwich the optical axis of the projection lens (67).
Is provided, and a rectangular prism body (30) is provided between the liquid crystal panels (7a) and (7b). On the opposite side of the projection lens (67) across the prism body (30), a liquid crystal panel corresponding to G
(7) is provided. Each liquid crystal panel (7) (7a) (7b)
Is attached to the frame (1), and the frame (1) is
It is attached to the support frame (2) fixed to (30). A light source (35) is provided at the light path entrance to the chassis (3), and a total reflection mirror (75) (76) (77) (78) and a dichroic mirror (45) (46) are provided on the light path. It is arranged at an angle of 45 degrees.

The light from the light source (35) passes through a condenser lens (7
After passing through (9) and being reflected by the total reflection mirror (75), the dichroic mirror (45) allows the passage of R and reflects G and B. R is reflected by the total reflection mirror (76), irradiates the liquid crystal panel (7a) corresponding to R, and the prism body (3).
The light is reflected by the combining mirror (31) in (0) and is emitted toward the projection lens (67). G is reflected by the dichroic mirror (46) and enters the prism body (30), and the incident light passes through the prism body (30) as it is and enters the projection lens (67).
B is reflected by the total reflection mirrors (77) and (78), and then reflected by the composite mirror (32) in the prism body (30) to project the projection lens.
(67). The parallel light passing through the condenser lens (79) needs to uniformly irradiate the entire surface of each liquid crystal panel (7) (7a) (7b). Therefore, the liquid crystal panels (7) (7a) (7b)
Is slightly moved back and forth along the optical axis, and is rotated in a vertical plane including the optical axis and orthogonal to the upper surface of the chassis (3).
This is called back focus adjustment. In addition, prism body
Since the optical axis of each light incident on (30) must coincide with one point, the liquid crystal panels (7), (7a) and (7b) are rotated in the plane including the liquid crystal panel, and An adjustment to move is made. This adjustment is called convergence adjustment.

FIG. 5 is a perspective view showing a back focus adjustment and a convergence adjustment. Both adjustments are performed by an automatic machine without manual operation. Except for the front surface, a support frame (2) (2) (2) provided with an opening (22) is attached to the peripheral surface of the prism body (30), and a support piece ( 20) (20) (20)
(20) is protruding. Each support piece (20) is pre-loaded with solder (5). The liquid crystal panel (7) is mounted on the frame (1), and a control device (8) is provided above the frame (1). The frame (1) is carried by the automatic arm (80) extending downward from the control device (8) to a position lightly in contact with the support piece (20). At this position, the light source (35) (see FIG. 6) is turned on and the frame
(1) is slightly rotated in the direction of arrow B and slightly moved back and forth in the plane perpendicular to the upper surface of the chassis (3), including the optical axis of the liquid crystal panel (7), to perform back focus adjustment. The light applied to the liquid crystal panel (7) passes through the opening (22) and enters the projection lens (67). Projection lens (67) to screen
An image projected on a camera (81) is photographed. The image from the camera (81) is sent to the control device (8),
When the brightness on the screen is at its maximum, the camera (81)
Sends a signal to that effect to the control device (8). Control equipment (8)
Stops the front and rear drive of the automatic arm (80).

Next, the control device (8) moves the automatic arm (80) to the left and right, and includes a liquid crystal panel (7) and a chassis.
(3) The convergence adjustment is performed by slightly rotating the liquid crystal panel (7) in a plane perpendicular to the upper surface. When the brightness on the screen is maximum, the control device (8)
Stop driving of (80). Next, the beam irradiating means (82) (82) is moved toward the frame (1), and the beam irradiating means (82) ( Irradiate the beam light of 82). The solder (5) on the support piece (20) melts and the frame
(1) is fixed to the support frame (2). At this time, the frame (1) may be slightly separated from the support frame (2). That is, the frame (1) is attached to the support frame (2) in a state where the back focus adjustment and the convergence adjustment are completed. Frame (1)
Condensing unit with the support frame (2) and the prism body (30)
(4) is constituted.

[0006]

Conventionally, when replacing the liquid crystal panels (7), (7a) and (7b), the prism (3)
0) and the light collecting unit (4) including the support frame (2) were replaced. Therefore, the cost for replacement has increased. Further, the distance from the liquid crystal panel (7) to the prism body (30) and the inclination with respect to the optical axis are determined by mounting the frame body (1) to the support frame (2). It was noticed that if only the liquid crystal panel (7) was removed and replaced, the back focus adjustment was unnecessary and only the convergence adjustment was necessary.
That is, if convergence adjustment is performed for each liquid crystal panel (7), there is no need to replace the prism body (30) and the support frame (2), and the cost for replacing the liquid crystal panel can be reduced. Further, the applicant has previously disclosed a convergence adjusting mechanism for a liquid crystal panel (see Japanese Patent Application Laid-Open No. 9-61782), and FIG. 7 is a perspective view showing a main part of this mechanism. This is a jig for adjustment
(55) is inserted from directly above, the liquid crystal panel (7) is raised and lowered and rotated by two adjusting screws (65) and (65), and the liquid crystal panel (7) is adjusted by the eccentric shaft (6). Adjust left and right. In this case, the jig (5
5) Insert the adjustment screw (65) and eccentric shaft
It is necessary to provide a member (64) that supports (6) at a position that covers the upper surface of the adjustment mechanism (100). The thickness of the adjustment mechanism (100) is increased by the front and rear width of the member (64). In such a projection device, downsizing is required, and it is necessary to reduce the thickness of the adjusting mechanism. An object of the present invention is to reduce the thickness of the adjustment mechanism and reduce costs when replacing a liquid crystal panel.

[0007]

Means for Solving the Problems A light collecting unit of a projection device
(4) is provided in the chassis (3), and the liquid crystal panel (7) is
The frame (1) detachably attached is fixed to a support frame (2), and the support frame (2) is attached to a prism body (30). Frame (1) supports frame (2) after back focus adjustment
And an adjusting tool into which an adjusting jig (55) is inserted is provided between the support frame (2) and the prism body (30), and the liquid crystal panel (7) is connected to the liquid crystal panel (7). A converter that moves in a plane perpendicular to the optical axis and perpendicular to the upper surface of the chassis (3).
An adjustment mechanism (100) for judge adjustment is provided. The adjusting mechanism (100) includes a plurality of plate is formed by stacking along the optical axis of the liquid crystal panel (7), the adjuster is protruded from the plate in the optical axis direction, the liquid crystal panel (7) When replacing, the frame
Remove the liquid crystal panel (7) from (1).

[0008]

[Operation and Effect] When replacing the liquid crystal panel (7), the frame
Remove only the liquid crystal panel (7) from (1). Since the frame body (1) is not removed, the back focus adjustment is unnecessary, and the convergence adjustment can be performed by operating the adjustment mechanism (100). Thus, when the liquid crystal panel (7) is replaced, only the liquid crystal panel (7) need be replaced without replacing the entire light collecting unit (4), and the cost at the time of replacement can be reduced. Also,
The adjusting mechanism (100) is configured by stacking a plurality of plates along the optical axis of the liquid crystal panel (7), and the adjusting tool into which the jig (55) is inserted is projected from the plate in the optical axis direction. Unlike the conventional example shown in FIG. 7, the member (64) that covers the adjusting mechanism (100) is unnecessary, and the adjusting mechanism (100) can be made thin.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. The same reference numerals are used for the same configuration as the conventional one. FIG. 1 is a plan view of the chassis (3). Light source (35),
Total reflection mirror (75) (76) (77) (78), dichroic mirror
(45), (46) and the arrangement of the prism body (30) are the same as in the prior art. Except for the front surface of the prism body (30), the liquid crystal panel
The frame (1) in which the (7) is fitted is opposed, and an adjustment mechanism () configured by stacking a support frame (2) and a plurality of plates between the frame (1) and the prism (30). 100) is deployed. Also in this example, as shown in FIG. 5, solder (5) is put on support pieces (20) (20) projecting from both sides of the support frame (2) in advance, and the solder (5) is melted. The frame (1) is fixed to the support frame (2). Also, the back focus adjustment and the convergence adjustment are automatically performed by combining the control device (8) and the camera (81).

(Details of Adjustment Mechanism) FIG. 2 shows a liquid crystal panel (7).
Adjustment mechanism (10
0) is an exploded perspective view, FIG. 3 is a front view of the adjustment mechanism (100), and FIG.
Fig. 2 is a perspective view of the same. The adjusting mechanism (100) includes a support frame (2).
On top, a rotating plate (9), a vertical moving plate (90), and a fixed plate (91) are stacked in this order along the optical axis of the liquid crystal panel (7). An opening that allows the image of panel (7) to pass through
(92) is provided. Support frame (2), vertical moving plate (90),
Eccentric shafts (6), (6a), (6b) are attached to the rotating plate (9), respectively, and window holes (93) are provided in the vertical moving plate (90), the rotating plate (9), and the fixed plate (91). ) Has been established. Eccentric shafts (6), (6a) and (6b) with adjusting holes (60) recessed in the head are fitted from the back side of each window hole (93), and the abutment protrudes from both edges of the window hole (93). The peripheral surface of the eccentric shaft (6) contacts the plates (94) (94). The contact plate (94) (9
4) is inclined obliquely, and the contact plates (94b) and (94b) of the vertical moving plate (90) are horizontal, and the contact plates (94c) and (94c) of the fixed plate (91) are vertical. Guide holes (95), (95a), (95b), and (95) are opened in the support frame (2), the rotating plate (9), the vertical moving plate (90), and the fixed plate (91), respectively. The guide hole (95a) of (9) extends vertically, and the guide hole (95b) of the vertical moving plate (90) extends horizontally. Support frame
Guide holes (98) and (98) are formed diagonally at the lower end of (2), and a guide boss (99) protrudes from the back surface of the rotating plate (9). In addition, the guide boss (9
9a), the guide bosses (99b) protrude from the surface, the guide boss (99b) is in the guide hole (95c) of the fixed plate (91), and the guide boss (99a) is the guide hole of the rotary plate (9). (95a). As shown in FIG. 4, a fixing screw (85) passes through the guide holes (95), (95a), (95b), and (95) with a margin. The tip of the fixing screw (85) is screwed into a stop plate (96) applied to the back surface of the support frame (2). The lower ends of the support frame (2) and the three plates (9), (90), (91) are clamped by clamps (97, 97).

An eccentric shaft (6) projecting from the support frame (2) has
Since the contact plates (94) and (94) of the rotating plate (9) are in contact, the eccentric shaft
When (6) is rotated, the support frame (2) and the liquid crystal panel (7) are rotated about the guide hole (98) and the guide boss (99) as a fulcrum.
Similarly, the eccentric shaft (6a) of the rotating plate (9) is attached to the vertical moving plate (9).
When the eccentric shaft (6a) is rotated, the vertical moving plate (90) moves up and down, and the vertical moving plate (9) contacts the contact plate (94b) (94b).
The guide boss (99a) of (0) penetrates the guide hole (95a) of the rotating plate (9), comes into contact with the support frame (2), and moves the support frame (2) up and down. Since the guide hole (95a) of the rotating plate (9) extends vertically, the rotating plate (9) does not move even if the vertical moving plate (90) moves up and down.

When the eccentric shaft (6b) of the vertical moving plate (90) is rotated, the eccentric shaft (6b) pushes the contact plates (94) and (94) of the fixed plate (91) sideways. However, since the fixing plate (91) is fixed to the prism body (30), it does not move, and the guide holes (9) of the fixing plate (91) do not move.
5c) extends sideways, so the vertical moving plate (90) and support frame
(2) moves sideways. To rotate each eccentric shaft (6), a jig (55) such as a hexagon wrench is inserted into the adjustment hole (60) of the eccentric shaft (6).
Is inserted from the optical axis direction. As shown in FIG. 4, the eccentric shaft
(6) is located above the prism body (30), and the prism body (30) does not hinder the adjustment.

The adjusting mechanism (100) in this embodiment is configured by stacking four plates along the optical axis direction. Also, since the jig (55) is inserted from the optical axis direction during adjustment, the adjustment mechanism (10
It is not necessary to provide an adjusting tool such as a screw at a position to cover the top surface of 0). In the conventional adjusting mechanism for inserting the jig (55) from above, as shown in FIG. 7, a member (64) for supporting the adjusting tool is provided at a position to cover the upper surface of the adjusting mechanism (100). The thickness of the adjusting mechanism (100) is increased by the width of the member (64). However, in this example, such a member (64) is unnecessary,
The adjustment mechanism (100) can be reduced in thickness by the amount of the member (64).

Since the frame 1 is attached to the support frame 2 shown in FIG. 4 in a state where the back focus is adjusted, when the liquid crystal panel 7 is replaced, the frame 1 is not used. If you remove only the liquid crystal panel (7) from (1), a new liquid crystal panel
Even if (7) is attached, back focus adjustment is not required. However, convergence adjustment is necessary because there is a possibility that the optical axis of the liquid crystal panel (7) is shifted from the prism body (30). This allows the liquid crystal panel (7) to be replaced without having to replace the entire light collecting unit (4).
Only (7) needs to be replaced, and the cost for the replacement can be reduced. The adjusting mechanism (100) is provided in each of the liquid crystal panels (7) corresponding to R, G, and B. In the actual convergence adjustment, since the G light is used as a reference for the adjustment mechanism (100), the adjustment mechanism (1) is attached to the liquid crystal panel (7) corresponding to G.
00), and liquid crystal panels (7a) and (7b) corresponding to R and B
A liquid crystal panel corresponding to G with an adjustment mechanism (100)
It is also conceivable to align the optical axis with (7). However, if the liquid crystal panel (7) corresponding to G is replaced, R and B
It is necessary to adjust both the liquid crystal panels (7a) and (7b) corresponding to. In this example, since the adjusting mechanism (100) is provided in each of the liquid crystal panels (7), (7a) and (7b), when the liquid crystal panel (7) corresponding to G is replaced,
It is sufficient to adjust the convergence of (7). That is, the workability when replacing the liquid crystal panel (7) is improved.

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 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 a plan view of a projection device.

FIG. 2 is a front view of the disassembled adjustment mechanism.

FIG. 3 is a front view of an adjustment mechanism.

FIG. 4 is a perspective view of an adjustment mechanism.

FIG. 5 is a perspective view showing back focus and convergence adjustment of the projection device.

FIG. 6 is a plan view of a conventional projection device.

FIG. 7 is a perspective view of a conventional adjustment mechanism.

[Explanation of symbols]

 (1) Frame (2) Supporting frame (3) Chassis (4) Light collecting unit (7) Liquid crystal panel (30) Prism (35) Light source (55) Jig

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G03B 21/14 G02F 1/13 505

Claims (3)

(57) [Claims] 1. A liquid crystal panel provided in a chassis (3).
Supporting frame (2) with frame (1) to which (7) is detachably attached
In the light-collecting unit configured by fixing the support frame (2) to the prism body (30), the frame body (1) is fixed to the support frame (2) after adjusting the back focus.
The adjustment jig (55) is provided between the support frame (2) and the prism body (30).
The adjustment tool into which is inserted is provided, and the liquid crystal panel (7) is
Convergence adjustment to move in a plane perpendicular to the optical axis of the liquid crystal panel (7) and perpendicular to the upper surface of the chassis (3)
The adjusting mechanism (100) is provided by stacking a plurality of plates along the optical axis of the liquid crystal panel (7), and the adjusting tool projects from the plate in the optical axis direction. When replacing the LCD panel (7) , the LCD panel (7) must be
A light-collecting unit characterized by removing the flannel (7) . 2. A light source (35) and a light source (3) in a chassis (3).
5) a spectroscopic means for separating the light from R, G, and B into light, and a condensing unit (4) on which each of the divided lights enters, and the condensing unit (4) is a prism body for synthesizing each light. A support frame (2) is attached to the peripheral surface of (30), and a frame (1) on which a liquid crystal panel (7) is detachably attached is fixed to the support frame (2). Frame (1) is fixed to the support frame (2) after adjusting the back focus
It is, between the support frame of the light collecting unit (4) and (2) of the prism body (30), the adjuster is deployed the adjustment jig (55) is inserted,
The liquid crystal panel (7), co-moved in a vertical plane relative to the perpendicular to and chassis (3) the upper surface to the optical axis of the liquid crystal panel (7)
An adjustment mechanism (100) for convergence adjustment is provided. The adjustment mechanism (100) is configured by stacking a plurality of plates along the optical axis of the liquid crystal panel (7). When the liquid crystal panel (7) is replaced , the liquid crystal panel is removed from the frame (1).
A projection device characterized by removing the flannel (7) . 3. The support frame (2) and the adjusting mechanism (100) are R,
3. The projection device according to claim 2, wherein the three liquid crystal panels corresponding to G and B are provided on each of the three liquid crystal panels.