JP2000056395A - Condensing unit and projector provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an adjusting mechanism thin and to reduce a cost in the case of exchanging a liquid crystal panel. SOLUTION: The condensing unit 4 of this projector is constituted by fixing a frame body 1 on which the liquid crystal panel 7 is attached to a supporting frame 2, and attaching the frame 2 to a prism body 30. An adjusting screw in which an adjusting jig 55 is inserted is arranged, and the adjusting mechanism 100 moving the panel 7 on a plane orthogonally crossing with the optical axis of the panel 7 and perpendicular to the upper surface of a chassis 3 is provided between the frame 2 and the body 30. The mechanism 100 is constituted by superposing plural plates along the optical axis of the panel 7, and the adjusting screw is protrudingly set in an optical axis direction from the plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection device 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 projection device.

[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 the 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), there is 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 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 supporting frame (2) (2) (2) provided with an opening (22) is attached to the peripheral surface of the prism body (30). 20) (20) (20)
(20) is protruding. Each support piece (20) is pre-loaded with solder (5). The liquid crystal panel (7) is attached to 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 where it comes into light contact with the support piece (20). At this position, the light source (35) (see FIG. 6) is turned on and the frame
The back focus is adjusted by slightly rotating (1) in the direction perpendicular to the upper surface of the chassis (3) including the optical axis of the liquid crystal panel (7) in the direction of arrow B and slightly moving it back and forth. The light irradiated on the liquid crystal panel (7) passes through the opening (22) and enters the projection lens (67). Projection lens (67) to screen
An image to be 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) in the left-right direction 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 (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, after the back focus adjustment and the convergence adjustment are completed, the frame (1) is attached to the support frame (2). 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 the attachment of the frame (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 the 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 adjustment 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 screw (65) and the 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 also necessary to reduce the thickness of the adjustment 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 Light-collecting unit of projection device
(4) fixing the frame (1) in which the liquid crystal panel (7) is mounted on the support frame (2) to the support frame (2), and mounting the support frame (2) on the prism body (30); Be composed. 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 moved to the optical axis of the liquid crystal panel (7). An adjustment mechanism (100) is provided for moving in a plane that is orthogonal and perpendicular to the upper surface of the chassis (3). 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 projects from the plate in the optical axis direction.

[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 (1) is not removed, the back focus adjustment is unnecessary, and the convergence can be adjusted 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 Hereinafter, an example of the present invention will be described 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 (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 body (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 support frame (2) in advance, and solder (5) is melted. The frame (1) is fixed to the support frame (2). Also, by combining the control device (8) and the camera (81), the back focus adjustment and the convergence adjustment are automatically performed.

(Details of Adjustment Mechanism) FIG. 2 shows a liquid crystal panel (7).
Adjustment mechanism (10
FIG. 3 is an exploded perspective view of the adjusting mechanism (100), FIG.
Is a perspective view of the same. The adjusting mechanism (100) includes a support frame (2).
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). Opening to allow the image of panel (7) to pass through
(92) is provided. Support frame (2), vertical moving plate (90),
Eccentric shafts (6), (6a) and (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), (6b) with recessed adjustment holes (60) fitted in the head from the back side of each window hole (93), and abutment protruding from both edges of window hole (93) The peripheral surface of the eccentric shaft (6) contacts the plates (94) (94). The contact plate (94) (9) of the rotating plate (9)
4) is tilted obliquely, the contact plates (94b) and (94b) of the vertical moving plate (90) are oriented horizontally, and the contact plates (94c) and (94c) of the fixed plate (91) are oriented vertically. 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
At the lower end of (2), guide holes (98) and (98) are formed diagonally, 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 rotating 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 fulcrums.
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 plates (94b) and (94b).
The guide boss (99a) of (0) penetrates the guide hole (95a) of the rotating plate (9), contacts 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. 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). However, the thickness of the adjusting mechanism (100) increases by the width of the member (64). However, in this example, such a member (64) is unnecessary,
The adjustment mechanism (100) can be made thinner 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 required. 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 adjustment 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 adjusting mechanism (100), the adjusting mechanism (1) is provided on 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 enough 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 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 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 F term (reference) 2H088 EA14 EA19 HA13 HA21 HA23 HA24 HA28 MA20 2H091 FA05Z FA14Z FA26X FA26Z FA41Z FD12 LA11 LA12 MA07

Claims (3)

[Claims] A liquid crystal panel provided in a chassis (3).
Fix the frame (1) to which (7) is attached to the support frame (2),
In the light collecting unit configured by attaching the support frame (2) to the prism body (30), an 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
An adjustment mechanism (100) for moving the liquid crystal panel (7) in a plane perpendicular to the optical axis of the liquid crystal panel (7) and perpendicular to the upper surface of the chassis (3) is provided. The adjustment mechanism (100) includes a plurality of plates. A light-collecting unit comprising a liquid crystal panel (7) stacked along the optical axis, and wherein the adjusting tool projects from the plate in the optical axis direction. 2. A light source (35) and a light source (3) in a chassis (3).
5) a spectroscopic means for dividing 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. In a projection device comprising a support frame (2) attached to the peripheral surface of (30) and a frame (1) on which a liquid crystal panel (7) is attached fixed to the support frame (2), An adjusting tool into which an adjusting jig (55) is inserted is provided between the support frame (2) of the optical unit (4) and the prism body (30).
An adjusting mechanism (100) for moving the liquid crystal panel (7) in a plane perpendicular to the optical axis of the liquid crystal panel (7) and perpendicular to the upper surface of the chassis (3); Is a projection device comprising a plurality of plates stacked along an optical axis of a liquid crystal panel (7), and an adjusting tool protruding from the plates in the optical axis direction. 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 (7), (7a), and (7b) corresponding to G and B are provided respectively.