JPH06202225A - Projection type picture display device - Google Patents

Abstract

PURPOSE:To provide a projection type picture display device capable of being used even in a room having no space where an external screen is set or on the outside of a room which is easily influenced by sun beam. CONSTITUTION:This device is equipped with a slide cover 24 provided on the inner side of a main body cover 4 so that it can slide and having guide pins engaging in guide grooves 36 formed on the right and left inner side surfaces of the main body cover 4 on right the and left outer side surfaces, a screen holding frame 39 pivotally supported at the trailing edge part of a rear side main body case 2 so that it can freely turn and having guide bosses 41 engaging with the guide grooves formed on the right and left inner side surfaces of the cover 24 on the right and left outer side surfaces, a transmission type screen 38 held by the holding frame 39, a reflector moving mechanism 50 moving a reflector 46 to the front position of a projection optical system 7 in response to sliding action to the front side of a front side main body case 3, and light shielding plates 44 pivotally supported on the right and left side surface parts of the case 2 so that they can freely turn and shielding light on both sides of the holding frame 39.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Generally, an external projection type projection image display apparatus for projecting and displaying an image on an external screen (reflection type screen) has a projection source such as a liquid crystal display panel in a main body case. The pixel light emitted from the projector is projected onto an external screen via a projection optical system.

Further, a projection type image display device of this kind has a projection hole in the front of the main body case, and the image light is emitted from this projection hole to project and display an image image on an external screen. .

[0004]

However, the above-mentioned projection type image display device has the following problems. That is, the above-described projection type image display device is an external projection system in which image light is emitted from a projection hole provided in the front surface of the main body case to project and display an image on an external screen. It could not be used indoors or outdoors where it is susceptible to sunlight.

The present invention has been made in view of the above problems, and an object thereof is a projection type image which can be used even in a room without a space for installing an external screen or an outdoor environment susceptible to sunlight. It is to provide a display device.

[0006]

In order to solve the above-mentioned problems, a projection type image display apparatus according to the present invention comprises a rear side main body case and a front side main body slidable in the front-rear direction with respect to the rear side main body case. A case and a main body cover rotatably supported at the front end of the front side main body case;
A projection optical system for projecting image light onto an external screen from a projection hole provided in the front main body case, a projection source for generating image light projected on the external screen from the projection optical system, and an inside of the main body cover. A guide pin that is slidably provided on the left and right inner side surfaces of the body cover and that engages with a guide groove formed on the left and right inner side surfaces of the body cover. Formed on the slide cover and a guide boss that is rotatably supported by the rear end of the rear body case and engages with guide grooves formed on the left and right inner side surfaces of the slide cover, or on the left and right inner side surfaces of the slide cover. Screen holding frame having guide grooves on the left and right outer sides for engaging with the formed guide boss, and a transmissive screen held by the screen holding frame. And a reflector for reflecting the image light projected from the projection optical system toward the transmissive screen, and the projection optical system for causing the reflector to move in response to a sliding movement of the front body case to the front side. And a light-shielding plate that is rotatably supported by the left and right inner side surfaces of the rear side main body case and that shields both side portions of the screen holding frame from light. .

[0007]

In the present invention, when the front body case is slid forward, the reflector moves to the front position of the projection optical system. Further, when the screen holding frame is rotated upward after sliding the front body case to the front side, the transmissive screen held by the screen holding frame appears on the rear side of the rear body case. After sliding the front body case to the front side and then rotating the screen holding frame upward, the light shielding plate rotatably attached to the left and right inner side surfaces of the rear body case is biased by a spring (not shown). Thus, the rear side main body case is rotated to both sides, and the openings formed on both sides of the screen holding frame are shielded from light.

Therefore, the image light projected from the projection optical system onto the external screen can be projected onto the transmissive screen held by the screen holding frame.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be described with reference to.

FIG. 1 is a plan view of a projection type image display apparatus according to an embodiment of the present invention, and FIG. 2 is a side view of the projection type image display apparatus according to the embodiment. 3 is a front view of the projection type image display apparatus according to the same embodiment, and FIG. 4 is a rear view of the projection type image display apparatus according to the embodiment.

1 to 4, reference numeral 1 denotes a projection type image display apparatus according to an embodiment of the present invention, and this projection type image display apparatus 1 has a rear side as shown in FIGS. A body case 2 is provided. The rear side main body case 2 is open at the upper side and the front side, and the front side main body case 3 having the upper side and the rear side opened is provided at the front side. This front side body case 3 is the rear side body case 2
It is slidable in the front-rear direction, and a projection hole 6 is provided in the center of the front surface thereof.

As shown in FIGS. 1 and 3, the rear side main body case 2 is provided above the rear side main body case 2.
A body cover 4 that covers the upper part of the front body case 3 is provided. The main body cover 4 is rotatably supported at its front end portions by hinge portions 5, 5 provided at the upper edge portion of the front end of the front side main body case 3, and these hinge portions 5, 5 serve as fulcrums to move upward. It is rotatable.

On the other hand, inside the rear side main body case 2, a projection optical system for projecting image light from a projection hole 6 formed in the front center of the front side main body case 3 to an external screen (reflection type screen) not shown. 7 are provided (see FIG. 5). As shown in FIG. 6, the projection optical system 7 includes a lens holder support 8 fixed to the bottom surface of the rear body case 2, and a space between the lens holder support 8 and the front wall portion of the rear body case 2. The lens holder 10 includes a guide rod 9 installed on the lens holder 10, a lens holder 10 slidably held by the guide rod 9, and a plurality of projection lenses 11 held in the lens holder 10. Is provided with a lead nut 12. The lead screw 1 of the focus adjusting mechanism 13 is attached to the lead nut 12.
4 is screwed, and by rotating the lead screw 14, the lens holder 12 is moved in the front-rear direction, and the focus of the projection image projected on the external screen can be adjusted.

As shown in FIG. 8, the focus adjusting mechanism 13 has a focus adjusting knob 15 provided on the front surface of the front side main body case 3 and rotation of the focus adjusting knob 15 via gears 17a, 17b and 17c. The lead screw 14
The focus adjusting shaft 16 is provided on both sides of the focus adjusting shaft 16.
Guide grooves 18a, 18b are formed along the axial direction to allow the axial movement of the (see FIG. 9).

A projection source 19 for emitting image light projected from the projection optical system 7 to the external screen is provided inside the rear side main body case 2. As shown in FIG. 6, the projection source 19 includes a liquid crystal display panel 20 and a condenser lens 21 provided on the back side of the liquid crystal display panel 20, and the condenser lens 21 has a condenser lens 21 on the rear side thereof. A backlight device 22 that illuminates the liquid crystal display panel 20 from the back side is provided.

Although not shown, the backlight device 22 is composed of a high-intensity lamp such as a metal halide lamp and a parabolic reflector that reflects the emitted light generated by the high-intensity lamp forward. There is.

Inside the body cover 4, a slide cover 24 is provided as shown in FIGS. 5 and 6. The slide cover 24 is slidable in the front-rear direction with respect to the main body cover 4, and guide grooves 25, 25 are formed on the left and right inner side surfaces thereof (see FIG. 10).

Further, on the left and right inner side surfaces of the slide cover 24, click mechanisms 26, 26 for restricting the movement of the slide cover 24 are provided. As shown in FIG. 10, these click mechanisms 26, 26 are rotatably supported by a first pivot shaft 27 provided on the inner surface of the slide cover 24 and the first pivot shaft 27. The first click plate 2 is provided with a first click plate 28 which is urged to rotate counterclockwise in the drawing by a spring (not shown).
8 is provided with a lock receiving portion 29 and bent portions 30a and 30b.

Further, as shown in FIG. 10, the click mechanisms 26, 26 are pivoted on the second pivot 31 provided on the inner surface of the slide cover 24 and the second pivot 31. The second click plate 32 is provided with a second click plate 32 that is freely supported and is urged to rotate counterclockwise in the drawing by a spring (not shown). A stop claw 34 is provided, and a guide pin 35 also serving as a locking member is provided. The guide pin 35 projects from the outer side surface of the slide cover 24 and engages with a guide groove 36 formed in the inner side surface of the main body cover 4, and the rear end upper edge portion of the guide groove 36 is provided with the slide cover 24. A lock receiving concave portion 37 that restricts movement is formed.

A screen holding frame 39 for holding the transmissive screen 38 is provided inside the slide cover 24 (see FIG. 5). The screen holding frame 39 is rotatably supported at its rear end by hinges 40, 40 provided at the upper edge of the rear end of the rear side main body case 2. Guide bosses 41, 41 that engage with the guide grooves 25, 25 formed on the left and right inner side surfaces of 24 are provided (see FIG. 11).

On the left and right outer surfaces of the screen holding frame 39, locking bosses 42, 4 which engage with the bent portion 30a and rotate the first click plate 28 counterclockwise in the drawing.
2 is provided, and the engaging protrusion 4 engages with the engaging recess 33 and restricts the movement of the second click plate 32.
3, 43 are provided.

On the lower surface side of the screen holding frame 39,
As shown in FIGS. 6 and 7, light shielding plates 44, 44 are provided. These light shielding plates 44, 44 are for shielding both sides of the screen holding frame 39 when the device 1 is used as a rear projection type image display device, and are rotatable on the inner surface of the rear body case 2. And are biased upward by springs (not shown).

As shown in FIGS. 6 and 12, a reflector 46 is provided on the side of the projection optical system 11.
The reflector 46 holds the image light projected on the external screen in the screen holding frame 39.
8, a support shaft 47 that is erected on the bottom surface of the front-side body case 3, and the support shaft 47.
The mirror holder 48 is rotatably supported by the mirror holder 48, and the mirror 49 is held by the mirror holder 48. The mirror holder 48 is urged to rotate counterclockwise in FIG. 12 by a spring (not shown).

In the vicinity of the reflector 46, the reflector 4 is moved in response to the sliding movement of the front body case 3 to the front side.
A reflector moving mechanism 50 that moves the projection optical system 6 from the side position of the projection optical system 7 to the front position is provided. As shown in FIGS. 12 and 13, the reflector moving mechanism 50 includes a fixed post 51 provided on the bottom surface portion of the front body case 3.
The first slide plate 52a having the front end fixed to the first slide plate 52a and the second slide plate 52b arranged on the lower surface side of the first case interlocking plate 52a are provided.
Oval slits 53a and 53b, which slidably engage with guide posts 54a and 54b provided on the bottom surface of the rear body case 2, are formed in the center of the 2a and 52b along the front-rear direction. There is.

Further, rack gears 55a and 55b are formed on one side edges of the slide plates 52a and 52b, respectively. A two-stage gear 56 rotatably provided on the bottom surface of the rear body case 2 is engaged with these rack gears 55a and 55b, and when the first slide plate 52a moves to the front side, the two-stage gear 56 is formed. Is rotated counterclockwise in the figure.

Further, the reflector moving mechanism 50 includes a reflector driving plate 57 for rotating the reflector 46 counterclockwise in the drawing with a support shaft 47 provided on the bottom surface of the front body case 3 as a fulcrum. I have it. The reflector driving plate 57 is a support post 58 provided on the bottom surface of the rear body case 2.
Is rotatably supported by a reflector 4 at its front end.
An oval slit 59 that slidably engages with a pin 60 provided on the mirror holder 48 of No. 6 is formed.

A pin 61 is provided at the rear end of the reflector driving plate 57. The pin 61 is engaged with a slit 62 formed at the front end of the second slide plate 52b, and a recess 63 is formed at the rear end of the slit 62.

As shown in FIG. 14, the projection type image display apparatus 1 configured as described above has a front side main body case 3 as shown in FIG.
Slide the front of the reflector moving mechanism 50 of the first
The slide plate 52a slides to the front side, and the two-step gear 56 rotates counterclockwise in FIG. 12 by the slide operation of the slide plate 52a to the front side. And the two-stage gear 56
When is rotated counterclockwise, the second slide plate 52b slides to the front side, and the sliding action of the second slide plate 52b urges the reflector to rotate counterclockwise in FIG. 12 by a spring (not shown). The drive plate 57 is the support post 5.
It rotates counterclockwise in FIG. 12 about 8 as a fulcrum. When the reflector drive plate 57 rotates counterclockwise, the mirror holder 48 causes the support shaft 4 to move by the urging force of a spring (not shown).
It rotates counterclockwise in FIG. 12 about 7 as a fulcrum. As a result, the mirror 49 held by the mirror holder 48 is shown in FIG.
As shown in, the projection optical system 7 moves from the side position to the front position and faces the projection lens 11 held by the lens holder 10.

After the front body case 3 is slid forward, the screen holding frame 39 is rotated upward as shown in FIGS. 15 and 16, and the screen holding frame 39 is provided on the left and right outer side surfaces. Locking projections 43, 4
3 is disengaged from the locking recess 33 provided in the second click plate 32, and the second click plate 32 is counterclockwise in the figure with the second pivot shaft 31 as a fulcrum by the urging force of a spring (not shown). Rotate. Then, the second click plate 32 rotates counterclockwise in the figure. As a result, the second click plate 32
The guide pin 35 provided at the above position engages with the lock receiving recess 37 provided at the upper edge of the rear end of the guide groove 36, and the slide cover 24 is locked at a predetermined position.

At this time, the locking bosses 42, 42 provided on the left and right outer surfaces of the screen holding frame 39 are separated from the bent portion 30a provided on the first click plate 28. As a result, the first click plate 28 rotates counterclockwise in the figure by the urging force of the spring (not shown), and the second click plate 3
The locking receiving portion 29 is brought into contact with the locking claw 34 provided on the second position.

When the screen holding frame 39 is rotated upward after the front body case 3 is slid forward, the transmissive screen 38 held by the screen holding frame 39 is placed behind the rear body case 2. Appear to the side (see FIGS. 16 and 17). When image light is emitted from the projection source 19 in this state, the image light emitted from the projection source 19 passes through the projection optical system 7 and hits the reflector 46 that has moved to a position in front of the projection optical system 7 and reaches the reflector 46. Then, the light is reflected obliquely upward and projected onto the transmissive screen 38.

Therefore, in the projection type image display apparatus 1 configured as described above, the image light emitted from the projection source 19 can be projected on the transmission type screen 38,
It can also be used indoors where there is no space to install an external screen or outdoors where it is susceptible to sunlight.

Further, in the projection type image display apparatus 1 having the above-mentioned structure, when the screen holding frame 39 is rotated upward after the front side main body case 3 is slid forward, the rear side main body case 2 is rotated. The light shielding plates 44, 44 rotatably supported on the left and right inner side surfaces of the body rotate to the side surface side of the front side body case 3 by the urging force of a spring (not shown), and the body cover 4, the slide cover 24 and the screen holding frame Three
Since it abuts on the left and right inner side surfaces of 9, the outside light can be prevented from entering from both sides of the body cover 4.

In the above embodiment, the guide pins 35, 35 engaging with the guide grooves 36, 36 formed on the left and right inner side surfaces of the body cover 4 are provided on the left and right outer side surfaces of the slide cover 24. Guide grooves may be provided on the left and right outer side surfaces of the main cover 4 and guide pins that engage with the guide grooves may be provided on the left and right inner side surfaces of the body cover 4.

Further, in the above embodiment, the slide cover 24
The guide bosses 41, 41 that engage with the guide grooves 25, 25 formed on the left and right inner side surfaces of the screen holding frame 39 are provided on the left and right outer side surfaces of the screen holding frame 39. Guide bosses that engage with the guide grooves may be provided on the left and right inner side surfaces of the slide cover 24. In the above embodiment, the projection source 19 including the liquid crystal display panel 20 and the backlight device 22 is used as the means for emitting the image light projected on the external screen and the transmissive screen 38. CR instead
You may use T etc.

[0036]

As described above, according to the present invention, when the screen holding frame is rotated upward after the front side body case is slid forward, the transmission screen held by the screen holding frame is opened. It appears on the rear side of the rear body case. When the front body case is slid forward, the reflector moves to the front position of the projection optical system, and the image light emitted from the projection source is projected on the transmissive screen via the projection optical system and the reflector. Therefore,
It is possible to provide a projection-type image display device that can be used indoors without a space for installing an external screen or outdoors that is easily affected by sunlight.

[Brief description of drawings]

FIG. 1 is a plan view of a projection-type image display device according to an embodiment of the present invention.

FIG. 2 is a side view of the projection type image display device according to the embodiment.

FIG. 3 is a front view of the projection type image display device according to the embodiment.

FIG. 4 is a rear view of the projection type image display apparatus according to the embodiment.

5 is a cross-sectional view taken along the line AA of FIG.

6 is a sectional view taken along line BB of FIG.

7 is a sectional view taken along line CC of FIG.

8 is a plan view of the focus adjustment mechanism shown in FIG.

9 is a cross-sectional view taken along line DD of FIG.

10 is a cross-sectional view taken along line EE of FIG.

11 is a sectional view taken along line FF of FIG.

FIG. 12 is a plan view of the reflector and the reflector moving mechanism shown in FIG.

13 is a cross-sectional view taken along line GG of FIG.

FIG. 14 is a side view showing a state where the front side main body case of the projection type image display device according to the example is pulled out to the front side.

FIG. 15 is a side view showing a state in which a main body cover and a screen holding frame of the projection type image display device according to the embodiment are turned upward.

16 is a rear view of the projection-type image display device shown in FIG.

17 is a cross-sectional view taken along line HH of FIG.

18 is a cross-sectional view taken along the line I-I of FIG.

[Explanation of symbols]

 2 ... Rear side body case 3 ... Front side body case 4 ... Body cover 6 ... Projection hole 7 ... Projection optical system 13 ... Focus adjustment mechanism 19 ... Projection source 24 ... Slide cover 25 ... Guide groove 26 ... Click mechanism 35 ... Guide pin 36 ... Guide groove 48 ... Transmissive screen 39 ... Screen holding frame 41 ... Guide boss 44 ... Shading plate 46 ... Reflector 50 ... Reflector moving mechanism

Claims (1)

[Claims] 1. A rear side main body case, a front side main body case slidable in the front-rear direction with respect to the rear side main body case, and a main body cover rotatably supported at a front end portion of the front side main body case. A projection optical system for projecting image light onto an external screen from a projection hole provided in the front main body case; a projection source for generating image light projected on the external screen from the projection optical system; and the main body cover. A guide pin that is slidably provided inside the main body cover and that engages with guide grooves formed on the left and right inner side surfaces of the body cover or a guide groove that engages with guide pins formed on the left and right inner side surfaces of the body cover. And a guide groove that is rotatably supported by the rear end of the rear body case and is formed on the left and right inner side surfaces of the slide cover. A screen holding frame having guide grooves on the left and right outer surfaces that engage with the matching guide bosses or guide bosses formed on the left and right inner surfaces of the slide cover; a transmissive screen held by the screen holding frame; A reflector that reflects the image light projected from the optical system toward the transmissive screen, and moves the reflector to the front position of the projection optical system in response to the sliding operation of the front body case toward the front side. A projection-type image display device, comprising: a reflector moving means for swiveling; and a light-shielding plate that is rotatably supported on the left and right inner side surfaces of the rear side main body case and shields both side portions of the screen holding frame. .