JP2002528747A - LCD integrated / overhead projector - Google Patents

Abstract

(57) Abstract A projector includes a housing having a single light projection source. The first condenser lens projects a first light beam from the light source through a LCD image display screen mounted on the housing to a projection surface. The second condenser lens projects the second light beam from the light source to the overhead projector mounted on the housing and the projection surface. The light blocking device is connected to the housing for moving to a position that selectively blocks the second light beam.

Description

DETAILED DESCRIPTION OF THE INVENTION

TECHNICAL FIELD The disclosure described herein generally relates to methods and apparatus for providing a projector system, and more particularly, as an integrated projector only or an overhead projector only. Liquid crystal display (LCD) integrated / can be used or both systems can be used simultaneously
It relates to combining overhead projector systems.

BACKGROUND Various projector devices have been developed for overhead projectors, and more recently have used LCD panels. One such device is:
7 describes a series of projectors adapted to project images from several sources. One embodiment is a projector having a transparency projector that is clearly suitable for 35 mm slides, an episcope type projector (the episcope projector is a projector intended for opaque document projection), and a television screen. Is disclosed. The TV screen is
The light is projected through a similar optical system which is the projection direction of the opaque object. Two separate light sources are used, and the television screen is self-luminous. The projected image of the opaque object and the projected image of the television screen are expected to be very dim, since this is a characteristic of the images projected from both these objects. The second embodiment differs from that of the first embodiment in that the slide projector is configured to project through the same optics as opaque projection and television screen projection.
A system is disclosed that achieves a similar goal as described above. Again, several light sources are used and the television screen is self-luminous. Yet another embodiment discloses a system in which the transparency projector, episcope projector, and television screen are integrated in a single unit.
In this embodiment, various images are generated from separate documents using two light sources and one self-luminous television screen. All of the above tend to be limited by the brightness of the final image and require an independent light source. Further, the electronic signal is reproduced by a television screen that generates light rather than simply modulating the electronic signal. Conventional television screens cannot alter the light incident on their surface, and indeed, the incident light is Note that it causes a noticeable visual degradation of the television screen.

Another device discloses a projector adapted to achieve a so-called “lap dissolve” projection. The latter is a technique for improving the continuity or smoothness of a presentation by configuring the intensity of a second image to increase as one image progressively disappears from the screen in the same frame. As a result, when the first image completely disappears, the second image is projected at full output. Although its mechanical complexity, and thus the number of discrete components that must be used, varies, there are many ways to achieve this goal. Certain embodiments have a single light source and a single projection lens. Two physically separated object planes (transparency or slide) provide a slide mirror that can be positioned so that light from a light source can be directed at one object plane or the other object plane at will. In addition, it is provided. There is no provision for electronic image projection, and no provision for altering the image during projection, for example, by writing with appropriate markers on the surface of the transparency.

[0004] Overhead projectors have been known for many years as presentation and teaching tools. One such device discloses an overhead projector having an automatic lamp changer function. If the lamp fails during use, one device of the projector detects the failure, removes the failed lamp, and transfers a second lamp to the position previously occupied by the failed lamp. The interruption of the presentation is minimal. More recent overhead projectors fold for compact storage. Among other recent developments in the field of overhead projectors are LCD panels. This is a device used with an overhead projector that is placed on the horizontal stage of the projector and connected to a computer, and can function as a video display device. Another device discloses a laptop computer having a removable display that can then be placed in an overhead projector to give a computer-based presentation.

[0005] More recently, devices commonly referred to as integrated or electronic projectors have become commercially available. This type of device is an LCD panel (transmission type panel)
Discloses the use of a collapsible optical system that transmits light. Other devices are
Sometimes they use reflective LCD panels called liquid crystal light valves. While such devices have great utility for making computer-based presentations, one limitation of this device is that it is difficult for the presenter to interact with the projected display. This ability to interact with the display is considered one of the advantages of an overhead projector, which makes it easy to use the pointer while facing the viewer without moving from the podium. Also, presentation techniques such as exposing images are more easily performed with overhead projectors.

[0006] Accordingly, what is needed is a system that can be used as an integrated projector only, or as an overhead projector only, or share a single lamp source. Combined LCD-integrated, which allows simultaneous use of both systems utilizing their own optical components without pivoting
A method and apparatus for providing an overhead projector system.

Accordingly, one aspect provides a method and apparatus for providing a combined LCD-integrated overhead projector system. To this end, the projector includes a housing with a single light projection source. The first condenser lens projects a first light beam from the light source through a LCD image display screen mounted on the housing onto a projector surface. The second condenser lens is
A second light beam from the light source is projected onto an overhead projector mounted on the housing and onto the projector surface. The light blocking device is connected to the housing for moving to a position that selectively blocks the second light beam. The main advantage of this aspect is that it provides a projector system that can be used as an integrated projector only, or as an overhead projector only, or use both systems simultaneously sharing a single lamp source. It is. The user can annotate the overhead projector while giving a data or video presentation on the LCD projector.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a projector is generally designated by 10 and is in a housing 12 formed of a suitable plastic material. The overhead projector member 13 is formed of a suitable material and has a folded position (FIG. 1) and an extended position (FIG. 2).
) Includes an arm 14 pivotally connected to the housing 12 by a pivot connection 16 to move the projector arm 14 between the arm 14 and the housing 14. The distal end 18 of the arm 14 includes a projection mirror 20 and a projection lens 22 mounted on a support 24 (FIGS. 2 and 3). The mirror 20 is pivotally mounted on a support 24 so as to move in a direction indicated by an arrow indicated by A. The mirror 20 is mounted so as to rotate within the support 24 in the direction indicated by the arrow B (FIG. 3a).

A recess 26 (FIGS. 2 and 3) allows housing 1 to receive arm 14.
2 is formed on the surface 28 and is formed integrally with the recess 26.
Also formed on a surface 28 of the housing 12 to receive a support 24 containing a mirror 20 and a lens 22. It can be seen from FIG. 1 that the arm 14 containing the mirror 20 is flush with the surface 28 when the arm 14 is in the collapsed position. Also, on the surface 28 (FIGS. 1, 2 and 3)
, A light exit port 30 is provided on a stage portion of the housing 12 that is covered by a suitable smooth planar glass member 32. Other surface 3 of housing 12
4 (FIG. 3) includes an exit port 36 for another light beam.

As shown schematically in FIGS. 4 and 5, projector 10 is an LCD-integrated overhead projector. A light source 38 is mounted in the housing 12 and includes a 575 watt metal halogen lamp mounted in a socket 41.
Preferably it is a lamp. As discussed below, lamp 38 provides a single light source for projecting a first light beam at exit port 30 and a second light beam at exit port 36.

A reflector 40 is mounted adjacent one side of lamp 38 (FIG. 5).
. On the other side, immediately next to the lamp 38 and opposite the reflector 40,
There is a condenser lens 42 that collects the light reflected by the reflector 40, transmits the divergent light represented by C through an infrared filter 44, and passes it through a lamp-side Fresnel lens 46. Ray C is collimated by Fresnel lens 46 and passes through polarizer 48, LCD image display screen 50, and projection Fresnel lens 52, which directs ray C to projector lens 54. Focus (Fig. 4
), Said projector lens 54 intensifies and diverges ray C from housing 12 via exit port 36 to a suitable projection surface (not shown).

The ray D from the lamp 38 is also collected by another adjacent condenser lens 56 that transmits the diverging ray D to another infrared filter 58 and Fresnel lens 60, said Fresnel lens 60 From the housing 12 via the exit port 30 and through the flat glass member 32 to the projection lens 22 (FIG. 3) and the projection mirror 20 on the same projection surface as the ray C.

A movable shutter member 62 (FIG. 5) or other light blocking means is movably mounted on the housing 12 and the light beam D is directed to the overhead projector member 1.
3. Acts as a means to block projection to 3. The shutter member 62 is moved from a first non-light blocking position E adjacent to the reflector 40 to a second position immediately adjacent to the condenser lens 56 so as to block the light beam D from exiting the exit port 30. It is suitably provided to manually pivot to F.

The lamp 38 emits a significant amount of light, which is much more than a typical tungsten halogen bulb commonly used in overhead projectors. The output of ray C is about 500 lumens. The output of the ray D is about 4000 to 50
It is 00 lumen.

If one wishes to use the projector 10 only for an LCD presentation while driving, for example, a personal computer can be connected to transmit the display content directly to the LCD image display screen 50 in a known manner. . Therefore, the image transmitted to the screen 50 is projected on the projection surface by the light ray C.
In this operation mode, the shutter member 62 has moved to the position F so as to block the light beam D from being projected on the overhead projector 13. When it is desired to use the projector 10 for a combined LCD and overhead presentation, the shutter member 62 has moved to the position E, so that the ray D can also be projected on the projection surface. The image on the projection surface from the LCD display screen 50 can be enhanced in image quality by transparency arranged on the stage at the exit port 30. Further, by moving the position of the mirror 20, the projection of the light beam D can be moved on the projection surface with respect to the projection of the light beam C, and as a result, for example, the presentation can be performed side by side. When it is desired to use the projector 10 only for overhead presentation, the shutter member 62 is located at the position E, so that the light beam D can be projected on the projection surface. However, no display signal is input to the LCD display screen 50, and therefore the only image projected on the projection surface is the image generated by the ray D from the stage at the exit port 30.

The embodiments described herein are an improvement over prior devices in that they utilize only one light source that can power one or both optics modes. Uses a transmissive LCD panel and is configured as an integrated projector, and the second mode is a projector similar to an overhead projector. The first mode can project images from a video or computer source onto the screen, while the second mode can project conventional overhead transparency. These modes can be used independently in the presenter's choice, or can be used together in an overlay, so that the presenter can point features on the video display, or use color overlays or presentations. Other tools can be used to make it easier to understand. Adjusting the overhead projector makes it possible to display an overhead projector image that is offset from the video image. Thus, two nominally unrelated images can be placed next to each other for comparison.

While exemplary embodiments have been illustrated and described, extensive modifications, changes, and substitutions are contemplated in the foregoing disclosure and in some instances, with some of the features of the embodiments corresponding to a range of corresponding uses of other features. Some may be used beyond. Therefore, it is appropriate that the claims appended hereto be construed broadly and in a manner consistent with the scope of the embodiments disclosed herein.

[Brief description of the drawings]

FIG. 1 is an isometric view illustrating one embodiment of a projector with an overhead projector arm in a collapsed position.

FIG. 2 is an isometric view illustrating one embodiment of a projector with an overhead projector arm in an extended position.

FIG. 3 is another isometric view illustrating one embodiment of a projector with the overhead projector arm in an extended position.

FIG. 3a is a partial isometric view illustrating one embodiment of a projection mirror and projection lens section of an overhead projector.

FIG. 4 is a side view schematically showing components of the projector mounted on the housing.

FIG. 5 is a partial side view schematically showing components of the projector.

[Procedural Amendment] Submission of translation of Article 34 Amendment of the Patent Cooperation Treaty

[Submission date] October 10, 2000 (2000.10.10)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

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Claims (20)

[Claims] 1. A housing, a light source mounted on the housing, and first condensing lens means for projecting a first light beam from the light source onto a projection surface through an LCD image display screen mounted on the housing. A projector comprising: an overhead projector mounted on a housing, and a second condenser lens means for projecting a second light beam from a light source onto the housing. 2. The projector of claim 1, wherein said housing includes an overhead projector arm pivotally mounted thereto. 3. The projector according to claim 2, wherein the projector arm includes a projection lens and a projection mirror attached to an end of the projector arm. 4. The housing of claim 3, wherein the housing includes a recess formed therein for receiving the projector arm, a projection lens, and a projection mirror.
The projector according to 1. 5. The projector according to claim 3, wherein the projection lens and the projection mirror are movably connected to the projector arm. 6. The first converging lens means is mounted on a first side of the light source, and a reflector is mounted on a second side of the light source opposite the first side. The projector according to claim 1, wherein: 7. The light source has a socket on one side thereof, and the second condenser lens means is mounted adjacent to the light source on another side opposite to the one side. The projector according to claim 1. 8. The projector according to claim 1, wherein the housing has a first light beam exit port and a second light beam exit port. 9. The first light beam exit port is provided on a first surface of the housing, and the second light beam exit port extends substantially perpendicular to the first surface. The projector according to claim 8, wherein the projector is provided on a second surface of the housing. 10. The apparatus further comprising: means connected to the housing and movable to a position for selectively blocking the second light beam, wherein the means for blocking the second light beam comprises: Two condenser lens means;
The projector according to claim 9, wherein the projector is movable to a position between the second light beam and an exit port. 11. The first light beam is sequentially transmitted from the first condenser lens means to an infrared filter, a first Fresnel lens, a polarizer, the LCD image display screen, a second Fresnel lens, 9. The projector according to claim 8, wherein the light passes through the projection lens. 12. The projector according to claim 8, wherein the second light beam sequentially passes through the infrared filter, the Fresnel lens, and the flat stage glass member from the second condenser lens means. 13. The light source of claim 1, wherein the light source is a metal halogen lamp.
The projector according to 1. 14. The projector arm, including the projection lens and the projection mirror, pivots within a recess formed in the surface for mounting flush with the surface of the housing. Item 3. The projector according to Item 3. 15. The first light beam for projecting on the projection surface.
The projector according to claim 8, wherein the projector exits through an exit port of the projector. 16. The second light beam exits the second exit port for sequentially projecting onto a projection lens, a projection mirror, and the projection surface onto the projection surface.
The projector according to 1. 17. The first light beam is a reflected light beam directly projected from the housing in a first direction with respect to the projection surface, and the second light beam is transmitted from the housing to the overhead projector. The projector according to claim 1, wherein the light is projected in a second direction substantially perpendicular to the first direction. 18. The first exit port directs the first light beam in a first direction, and the second exit port directs the second light beam in a second direction different from the first direction. The projector according to claim 8, wherein the projector is oriented in a direction. 19. An LCD-integrated overhead projector, comprising: a housing, a light source mounted on the housing, a reflector mounted adjacent the light source, and projecting a first light beam reflected by the reflector from the light source. First condensing lens means, wherein the first light beam is transmitted to an L-shaped light source mounted on the housing.
Condensing lens means adapted to be projected out of said housing in a first direction through means for collimating said light rays going through a CD image display screen toward a projection surface; Second condensing lens means for projecting a second light beam of
Passing said second light beam through an overhead projector mounted on said housing and means for collimating said light beam towards said projection surface, in a second direction substantially perpendicular to said first direction, Second condensing lens means adapted to be projected out of the housing; and means coupled to the housing, wherein the second light ray is projected to the overhead projector. Means for selectively moving to a position for blocking. 20. A method for providing an LCD-integrated overhead projector, comprising: mounting a light source on a housing; and transmitting a first light beam from the light source from the housing to an LCD image display mounted on the housing. Projecting through a screen to a projection surface; and directing a second light beam from the light source from the housing toward an overhead projector mounted on the housing and the projection surface. And moving a light blocking device mounted in the housing to selectively block the second light beam from exiting the housing.