JP2001209120A - Projector device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector device where a light source unit is attached to an optical unit accurately with reference to the optical axis of the optical unit. SOLUTION: A screen 110 is arranged on the outer surface of a housing 101, and a light source unit 200 and an optical unit 130 connected to the light source unit are arranged inside the housing. The light source unit is provided with a base part 220 for fixedly holding a light source 210 and positioning the light source 210 with reference to the optical unit, and a casing part 230 which is fixed to the housing part and for idly supporting the light source fixedly held by the base part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projector for displaying an image using light from a light source housed in a housing.

[0002]

2. Description of the Related Art A projector apparatus combines three light components using, for example, three liquid crystal light valves for controlling red, green, and blue colors, respectively, and enlarges and projects the combined light through a lens. Things. FIG. 15 is a diagram schematically illustrating a general projector device. The illumination light L from the light source 1 is separated and reflected by a red light R by a dichroic mirror 2a. The red light R separated and reflected is reflected by the reflection mirror 3a and reaches the liquid crystal light valve 4a for red.

On the other hand, the green light G and the blue light B transmitted through the dichroic mirror 2a are separated by the dichroic mirror 2b.
Green light G is separated and reflected. Green light G separated and reflected
Reaches the liquid crystal light valve 4b for green. On the other hand, the blue light B transmitted through the dichroic mirror 2b is reflected by the reflection mirror 3b, passes through the lens 5, and is reflected by the reflection mirror 3c.
And reaches the liquid crystal light valve 4c for blue.

Then, red light R, green light G, blue light B
Are liquid crystal light valves 4a, 4b, respectively driven by a driving circuit based on red, green, and blue video signals.
4c, the light is modulated. Thereafter, the light-modulated lights are color-synthesized by the synthesizing prism 6 and are enlarged and projected on the screen 7. Thereby, an image can be displayed on the screen 7.

[0005] Such a projector device comprises a light source 1 case or a dichroic mirror 2a following the case.
Form a positioning hole in one of the optical system cases, etc.
On the other side, a positioning pin is provided to make the optical axis of the light source 1 coincide with the optical axis of the optical system.
Reference).

[0006]

However, even if the case of the light source 1 is attached to the case of the optical system and the optical axis is aligned with the positioning hole and the pin, the light source 1 and the case have an integral structure. After that, the case of the light source 1 is
If a mounting error occurs when the optical axis is mounted on the house, the optical axis once aligned will be shifted. Then, when the optical axis shifts, there is a problem that the brightness is reduced, the brightness is uneven, and the color is uneven.

FIG. 16 is a view for explaining the occurrence of a decrease in luminance. As shown in FIG. 16A, when the optical axes are aligned, the liquid crystal light valve is illuminated by the illumination light from the light source 1. Since the effective screens 4a, 4b, and 4c cover almost the entire surface, there is no reduction in luminance. However, as shown in FIG. Since the effective screens 4a, 4b, and 4c are surfaces except for the hatched portions in the drawing, the brightness is reduced.

FIG. 17 is a diagram for explaining the occurrence of luminance unevenness. As shown in FIG. 17A, when the optical axes are coincident, the peak of the illuminance distribution P of the light source 1 is equal to the liquid crystal. Since the illuminance distribution Q of the liquid crystal light valves 4a, 4b, and 4c is substantially uniform because there is the center of the light valves 4a, 4b, and 4c, luminance unevenness does not occur. However, as shown in FIG. Is shifted, the peak of the illuminance distribution P of the light source 1 is shifted from the center of the liquid crystal light valves 4a, 4b, 4c, so that the illuminance distribution Q 'of the liquid crystal light valves 4a, 4b, 4c is obtained.
Is uneven and luminance unevenness occurs.

FIG. 18 is a diagram for explaining the occurrence of color unevenness. As described above, when the optical axis is shifted,
The peaks of the illuminance distribution of the light source 1 are
b, 4c, the liquid crystal light valve 4
Although the illuminance distribution of a, 4b, and 4c becomes non-uniform,
Further, as shown in the figure, since only the blue light B needs to be inverted from the arrangement of the optical system, the illuminance distribution is also inverted. Therefore, when the red, green, and blue video signals are combined on the screen 7, color unevenness occurs. Occurs.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a projector device in which a light source unit can be attached to an optical axis of an optical unit with high accuracy.

[0011]

According to the present invention, a screen is provided on an outer surface of a housing, and a light source unit and an optical unit connected to the light source unit are provided inside the housing. In the projector device that is provided and displays an image by irradiating the screen with light from a light source through an optical system, the light source unit includes:
A base portion fixedly holding the light source for positioning with respect to the optical unit; and a case portion fixed to the house portion and supporting the light source fixedly held on the base portion with play. This is achieved by:

According to the above configuration, the base portion independent of the case portion of the light source unit fixedly holds the light source, and the case portion supports the base portion fixedly holding the light source with play. For this reason, once the base unit fixedly holding the light source is mounted on the optical unit with high precision, even if a mounting error occurs when the case unit is mounted on the house unit, the mounting error may occur between the case unit and the base unit. Since the mounting error can be corrected, the optical axis of the light source unit and the optical axis of the optical unit can be maintained in alignment.

[0013]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the embodiments described below are preferred specific examples of the present invention,
Although various technically preferable limits are given, the scope of the present invention is not limited to these modes unless otherwise specified in the following description.

FIG. 1 is a schematic perspective view showing the appearance of a preferred embodiment of a projector apparatus according to the present invention, and FIGS.
FIG. 2 is a schematic plan view and a schematic side view of the internal structure example viewed from the front side and the side. This projector device 10
Reference numeral 0 denotes a so-called three-panel type liquid crystal projector device using three liquid crystal light valves. Projector device 10
0 has a housing 101, and the upper 10
2 is provided with a screen 110 in front of the housing 101.
A mirror 120 is provided on the inner rear surface of the upper part 102 of the camera.

Further, an optical unit 130 and a light source unit 200 connected to the optical unit 130 are arranged in the center of the lower portion 103 of the housing 101, and an electric circuit, a cooling fan, etc. (not shown) are arranged around them. ing. And
A light source unit 200 is provided on the front surface of the lower portion 103 of the housing 101.
Light source unit entrance 1
04 is provided.

FIG. 4 is a diagram showing an optical system of the optical unit 130. The lens array 1 is provided on the light source unit 200 side.
A dichroic mirror 132a for dispersing light from the light source unit 200 into light of three colors of red, green, and blue (R, G, B) and guiding the light to the liquid crystal light valves 137a, 137b, and 137c is provided. , 132b and reflection mirrors 133a, 133b, 133c are arranged along the optical axis L.

The paths through which the three colors of light pass are:
The condensing lenses 134a, 134b, and 134 are so arranged that the three colors of light are separately incident on the respective surfaces of the subsequent synthesis prism 137.
c, polarizing plates 135a, 135b, and 135c, and liquid crystal light valves 136a, 136b, and 136c, respectively. Further, a projection lens 138 for enlarging and projecting the combined light is disposed downstream of the combining prism 137.

The operation of such a configuration will be described. Illumination light from a light source such as a metal halide lamp provided in the light source unit 200 passes through the lens arrays 131a and 131b through cut filters that block ultraviolet rays and infrared rays, and the red light R is separated and reflected by the dichroic mirror 132a. You. The separated and reflected red light R is reflected by the reflection mirror 133a, passes through the condenser lens 134a and the polarizing plate 135a, and reaches the liquid crystal light valve 136a for red.

On the other hand, green light G and blue light B transmitted through the dichroic mirror 132a are separated and reflected by the dichroic mirror 132b. The green light G separated and reflected passes through the condenser lens 134b and the polarizing plate 135b, and reaches the liquid crystal light valve 136b for green.
On the other hand, the blue light B transmitted through the dichroic mirror 132b passes through the lens 139a, is reflected by the reflection mirror 133b, further passes through the lens 139b, and is reflected by the reflection mirror 13b.
It is reflected at 3c. Then, the light passes through the condenser lens 134c and the polarizing plate 135c, and is transmitted through the liquid crystal light valve 13 for blue.
Reaches 6c.

Then, red light R, green light G, blue light B
Are liquid crystal light valves 136a, 1d driven by a drive circuit based on red, green, and blue video signals, respectively.
The light is modulated when passing through 36b and 136c, respectively. After that, each of the light modulated light is combined with the combined prism 137.
And is transmitted through the projection lens 138 to the mirror 12.
The light is reflected at 0 and is enlarged and projected on the rear side (inner side) of the screen 110. Thus, an image can be displayed on the screen 110.

FIG. 5 is a partial sectional side view showing an example of the structure of a light source unit 200 which is a characteristic part of the present invention.
FIG. 6 is a plan view seen from the direction a in FIG. 5. The light source unit 200 fixes and holds the light source 210 and positions the base portion 220 for positioning with respect to the optical unit 130, and houses the light source 210 fixed and held on the base portion 220 and supports the light source 210 with play. The case 230 is schematically configured.

As the light source 210, for example, a metal halide lamp or the like is used. The base portion 220 is formed in a substantially ring shape as shown in the three views of FIGS. 7 and 8 and the plan view seen from the direction a in FIG. Formed slightly smaller than the outer diameter of
The inner diameter on the b-direction side is formed to be slightly larger than the outer diameter of the tip of the light source 210. Then, on the outer end face on the a-direction side,
Two positioning pins 221 and 222 for positioning with respect to the optical unit 130 and one butting pin 22
3 are arranged at equal angles. The distal end of the light source 210 is inserted into the inner peripheral portion on the b-direction side of the base 220, and the distal end surface of the light source 210 is positioned against the inner end surface on the a-direction side.

The case portion 230 is formed in a hollow box shape, and includes a lid portion 231 shown in a two-sided view of FIG. 9, a side view of FIGS. 10 and 11, and a plan view seen from the direction a in FIG. As shown in FIG. A hole 233 having substantially the same diameter as the inside diameter of the base portion 220 on the a direction side is formed on the outer end surface of the cover portion 231 on the direction a, and a positioning pin of the base portion 220 is formed on the periphery of the hole 233. Notch 23 for projecting 221 and 222 and butting pin 223
4, 235 and 236 are formed. The inside of the main body 232 has a space that can accommodate the rear end of the light source 210, and a plurality of holes 237 for radiating heat generated by the light source 210 are provided on the side surface.

The procedure for assembling and mounting the light source unit 200 having such a configuration will be described with reference to FIGS. First, as shown in FIG. 12, the distal end of the light source 210 is inserted into the inner peripheral portion of the base portion 220 in the direction b (see FIG. 7), and the distal end surface of the light source 210 is inserted in the direction a of the base portion 220 (see FIG. (See 7)). Then, by inserting a plate-like light source fixing spring (holding means) 240 between the outer peripheral surface of the distal end portion of the light source 210 and the inner peripheral surface of the base portion 220, the restoring force causes the outer periphery of the distal end portion of the light source 210 to be inserted. The surface is pressed against the inner peripheral surface of the base portion 220. At this time, by increasing the elastic force of the light source fixing spring 240, the light source 210 can be firmly fixed and held on the base portion 220.

Subsequently, the base 220 on which the light source 210 is fixedly held is inserted into the cover 231 from the direction a (see FIG. 9), and the positioning pins 221 and 222 and the abutment pin 223 of the base 220 are connected to the cover 231. 231 cutout portion 234,
235, 236. Then, the lid 231
Light source fixing spring (supporting means) between inner surfaces facing each other
241 is locked, the conical rear portion of the light source 210 is sandwiched by its restoring force, and the light source 210 is urged toward the distal end, so that the base portion 220 on the a-direction side (see FIG. 7) is The outer end face is in the a direction side of the lid portion 231 (see FIG. 9).
Press against the inner end face of. Then, the rear end portion of the light source 210 incorporated in the lid portion 231 is inserted into the main body portion 232 from the direction a (see FIG. 10), and the lid portion 231 and the main body portion 23 are inserted.
And 2 are fixed with screws.

At this time, the rear portion of the light source 210 has a curved surface so that it is easy to slide, and since the light source fixing spring 241 has a U-shape, it is easy to open and close. When an external force greater than the restoring force is applied, the light source 21 fixed and held on the base portion 220
0 can move. Therefore, by setting the elastic force of the light source fixing spring 241 to a certain value,
The light source 210 fixed and held by the base part 220 can be supported by the case part 230 with play. Thus, the assembly of the light source unit 200 is completed.

Next, a light source positioning plate 250 as shown in FIG. 13 is attached with high precision to the optical unit 130 side. The light source positioning plate 250 is provided with positioning guide holes 251 and 252 into which the positioning pins 221 and 222 of the base 220 are inserted, and a hole 253 through which illumination light from the light source 210 passes. The light source unit 200 is brought close to the light source positioning plate 250, and the positioning pins 2 of the light source unit 200 are inserted into the positioning guide holes 251 and 252 of the light source positioning plate 250 as shown in FIG.
21 and 222 are inserted and the abutment pin 223 is abutted against the light source positioning plate 250, so that the base portion 220
Is positioned with respect to the optical unit 130. Then, the case 230 is fixed to the house 260 by screws.

At this time, as described above, the light source 210
Is fixedly held by the base 220 and the case 23
0 with play, and is positioned on the light source positioning plate 250, so that the case 230
Even if an error occurs in the screw fixing position between the housing and the house part 260, it is possible to obtain a highly accurate optical axis which is not affected by the error.

The above-described embodiment is a so-called three-panel type projector having three liquid crystal light valves 136a, 136b, and 136c, but is not limited thereto, and is a single-panel type projector using one liquid crystal light valve. Of course, it does not matter.

[0030]

As described above, according to the present invention,
The light source unit can be attached to the optical axis of the optical unit with high accuracy.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an appearance of a projector according to a preferred embodiment of the invention.

FIG. 2 is a schematic plan view of an example of the internal structure of the projector device of FIG. 1 as viewed from the front side.

FIG. 3 is a schematic side view of an example of the internal structure of the projector device of FIG. 1 as viewed from the side.

FIG. 4 is a diagram showing an optical system of an optical unit of the projector device of FIG.

FIG. 5 is a partial cross-sectional side view showing a structural example of a light source unit of the projector device of FIG.

FIG. 6 is a plan view of the light source unit of FIG. 5 viewed from the direction a.

FIG. 7 is a three-view drawing of a base part of the light source unit of FIG. 5;

FIG. 8 is a plan view of the base portion of FIG. 7 viewed from the direction a.

FIG. 9 is a two-sided view of a case of the light source unit of FIG. 5;

FIG. 10 is a side view of the case section of FIG. 9;

FIG. 11 is a plan view of the case section of FIG. 10 viewed from the direction a.

FIG. 12 is a first diagram illustrating a procedure for assembling and mounting the light source unit of FIG. 5;

FIG. 13 is a second diagram for explaining a procedure of assembling and mounting the light source unit of FIG. 5;

FIG. 14 is a third view for explaining the procedure of assembling and mounting the light source unit of FIG. 5;

FIG. 15 is a diagram schematically illustrating a general projector device.

FIG. 16 is a view for explaining the occurrence of a decrease in luminance in the projector device of FIG. 15;

FIG. 17 is a diagram for explaining occurrence of uneven brightness in the projector device of FIG.

18 is a view for explaining the occurrence of color unevenness in the projector device of FIG.

[Explanation of symbols]

100: Projector device, 101: Housing, 1
10 ... screen, 120 ... mirror, 130.
..Optical units, 131a, 131b... Lens arrays, 132a, 132b... Dichroic mirrors, 133a, 133b, 133c.
134a, 134b, 134c: condenser lens, 13
5a, 135b, 135c ... polarizing plates, 136a, 1
36b, 136c ... liquid crystal light valve, 137 ...
.Synthetic prism, 138: Projection lens, 200
・ Light source unit, 210 ・ ・ ・ Light source, 220 ・ ・ ・ Base part, 221 ・ 222 ・ ・ ・ Positioning pin, 223 ・ ・
・ Abutment pin, 230 ・ ・ ・ Case part, 231 ・ ・ ・
Lid portion, 232: main body portion, 240: light source fixing spring (holding means), 241: light source fixing spring (supporting means)

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09F 9/00 360 H04N 5/74 F H04N 5/74 G02F 1/1335 530 F term (Reference) 2H088 EA14 EA15 EA18 EA19 HA06 HA13 HA20 HA23 HA24 HA28 MA04 MA06 2H089 HA40 QA05 QA06 QA11 QA13 2H091 FA05Z FA10Z FA21Z FA26Z FA41Z FD06 FD12 FD22 GA11 LA03 LA18 MA07 5C058 AB03 AB06 BA35 EA01 A12 EA11 A12 EA11 A12 EA11 EA32 FF03 FF12 GG02 GG03 GG04 GG23 GG28 KK03 LL15

Claims (6)

[Claims] 1. A screen is provided on an outer surface of a housing, and a light source unit and an optical unit connected to the light source unit are provided inside the housing, and light of the light source is transmitted through an optical system. In a projector device that displays an image by irradiating the screen, the light source unit is fixed to a house portion that fixes and holds the light source and is positioned with respect to the optical unit, and is fixed to the base portion. And a case section for supporting the held light source with play. 2. The projector according to claim 1, wherein the base unit includes a holding unit for holding the light source. 3. The projector device according to claim 2, wherein said holding means is a spring for urging said light source in a direction perpendicular to an optical axis. 4. The projector according to claim 1, wherein the base unit includes a positioning pin inserted into the optical unit to position the light source. 5. The projector according to claim 1, wherein the case unit includes a support unit for supporting the light source with play. 6. The projector device according to claim 5, wherein said support means is a spring for urging said light source in an optical axis direction.