JP2924410B2 - LCD projector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal video projector.

[0002]

2. Description of the Related Art In a liquid crystal projector which irradiates liquid crystal with a light source lamp and projects an image on a screen from the front, the brightness of the light source lamp is limited. When used in a bright place, the contrast deteriorates due to the influence of external light. It intends Teshima. others
Therefore, it was common to use it in a dark place . for that reason
Use after shading the room or at night
Ease of use because it was so as to was bad.

On the other hand, a method of projecting from the back of a screen as shown in FIG. 1 of Japanese Utility Model Application Laid-Open No. 2-131775 has been proposed so that the apparatus can be used in a bright place. Has become larger,
There is a drawback that portability deteriorates.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to improve portability and ease of use, although the screen size is somewhat small, but it can be used in bright places.

[0005]

According to a first aspect of the present invention, there is provided a reflective screen for projecting an image, and means for connecting the reflective screen to a projector main body. Are rotatably connected independently at each connection part , and the reflection type screen is
The projector and the projector body are rotated by the rotation of the
The projection lens axis of the projector body and the surface of the reflective screen
Connection means having a configuration that can be set so as to be orthogonal . According to a second aspect of the present invention, there is provided a transmissive screen for projecting an image, and means for connecting the transmissive screen to a projector main body, wherein the transmissive screen and the projector main body are independently provided at each joint. Rotatably coupled with the transmission screen
The projector body by the rotation
The projection lens axis of the main body and the surface of the transmission screen
And a connecting means having a configuration that can be set to a posture orthogonal to the direction of the arrow . In a third aspect of the present invention,
A transmission type screen for projecting an image, and means for coupling the transmission screen to the projector body, the transmission screen, each of said projector main body is rotatably coupled independently at each coupling section, said transmission type Screen and
The projector body is rotated by the rotation of the projector body.
Axis of the projection lens and the surface of the transmission screen
A connecting means having a configuration that is settable in orthogonal orientation, includes a direct light of the projection lens, the transmission type scan
The configuration is such that projection is performed on a clean surface .

[0006]

The connecting means may be a reflective screen or a transmissive screen.
Clean and the projector body to the means
Are connected in an independently rotatable state, and
The professional screen of the reflective screen or the transmissive screen
The positional relationship with respect to the ejector body is specified.

[0007]

1 to 3 show a first embodiment of the present invention. FIG. 4 shows a second embodiment. First, a first embodiment will be described. In FIG. 1, the small screen 4 attached to the frame 3 does not interfere with the projection of the screen, that is, the main body 1 of the liquid crystal video projector 1.
-1 is stored on the surface where the projection lens 2 is not provided. The liquid crystal video projector body 1-1 and the frame 3
Are connected by two joints 7-1 and 7-2 rotatable about axes 5 and 6, respectively. In the case of the state shown in FIG. 1, the user darkens the room and projects it on a large screen 9 (generally, a screen for a large screen of 40 inches to 100 inches).
Watch from. As is clear from FIG. 1, the external dimensions of the liquid crystal video projector body 1-1 and the screen 3 are as follows.
Approximately the same size and excellent portability. When viewing in a bright place, as shown in FIG.
1 and 7-2, and by rotating the frame 3 and the projector main body 1-1 about the joint axes 5 and 6, the axis 2-1 of the projection lens is moved with respect to the surface of the small screen 4. At right angles (set at right angles to eliminate trapezoidal distortion on the screen). By making the small screen 4 a transmissive screen, the user can view the screen from the position shown in 8-2. Since the provided small screen 4 is as small as about 10 inches, the luminous flux density is high and a bright screen is obtained (claim 2 above). In order to obtain a brighter and higher-contrast screen, it is sufficient to cover the space between the video projector body 1-1 and the small screen with a small light-shielding cover as shown in FIG. Furthermore, when the small screen is used as a reflection type screen, it is obvious that the user only needs to view the screen from the position shown in 8-3 (claim 1 above).

FIG. 4 shows a second embodiment.
Since the joint in FIG. 1 is a single joint and has the same operation as that of the first embodiment, detailed description is omitted. , The solid line shows the state when the image is projected on the small screen 4.

[0009]

The projector of the present invention can be used in a bright place.
Can also be used, thus expanding the applications. In addition, the present invention
As shown in Fig. 1, the projector has a
Because it can be compact, it is suitable for carrying, outdoors and when traveling
But can be used.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of a liquid crystal projector of the present invention.

FIG. 2 is a diagram showing a state at the time of operation of the embodiment of FIG. 1;

FIG. 3 is a diagram showing a state in which a bellows-shaped cover is provided to increase contrast when the small screen shown in FIG. 2 is used as a transmission screen.

FIG. 4 is a diagram showing a second embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Liquid crystal video projector, 1-1 ... Liquid crystal video projector main body, 2 ... Projection lens, 2-1 ... Projection lens axis, 3 ... Small screen frame, 4 ... Small screen (second screen), 5 ... Joint Rotary axis (video projector side), 6 ... rotational axis of joint (small screen side), 7, 7-1, 7-2 ... joint, 8-1, 8-
2, 8-3: user, 9: large screen (first screen), 10: bellows-like cover.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-41493 (JP, A) Japanese Utility Model Showa 57-28438 (JP, U) Japanese Utility Model Showa 57-1997028 (JP, U) Japanese Utility Model Showa 61- 44644 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G03B 21/00 G03B 21/30 G03B 21/10

Claims (3)

(57) [Claims] 1. A liquid crystal projector for projecting an image on a screen, comprising: a reflective screen for projecting an image; and means for connecting the reflective screen to a projector main body, wherein each of the reflective screen and the projector main body is provided. rotatably coupled independently at each coupling unit, the reflected
The rotation of the projection screen and the projector body
The projection lens axis of the projector body and the reflection type screen
A liquid crystal projector comprising: a connecting means having a configuration that can be set so that surfaces of the screens are orthogonal to each other . 2. A liquid crystal projector for projecting an image on a screen, comprising: a transmissive screen for projecting an image; and means for connecting the transmissive screen to a projector main body, wherein each of the transmissive screen and the projector main body includes: Each connection is independently rotatably connected , and
The oversized screen and the projector body are
Projection lens axis of projector body and the transmission screen
A liquid crystal projector comprising: a connecting means having a configuration in which the surfaces can be set so as to be orthogonal to each other . 3. A liquid crystal projector for projecting an image on a screen, comprising: a transmissive screen for projecting an image; and means for connecting the transmissive screen to a projector main body, wherein each of the transmissive screen and the projector main body includes: Each connection is independently rotatably connected , and
The oversized screen and the projector body are
The axis of the projection lens of the projector body and the transmission screen
Comprising a coupling means having a structure in which the emission surface is settable in attitude perpendicular to each other, the direct light of the projection lens, the surface of the transmission screen
A liquid crystal projector characterized in that the liquid crystal is projected onto a liquid crystal panel.