JPH11327046A - Projecting system for projecting unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projecting system where transmitted heat is reduced and light quantity is large. SOLUTION: A light source device 10 is constituted by housing in a heat- resistant housing 13 a light source part 11 by which a picture to be projected 3 is projected with high lightness and whose light quantity is large and a condensing lens system 12 for collecting a heat ray out of the light from part 11 at a position separated therefrom in comparison with visible light. The condensing end of an optical fiber 7 is attached at the visible light condensing position of the light source device 10, and the light emission end of the optical fiber 7 is attached at the starting end of the projection optical path 2 of a projecting unit 1, and the picture to be projected 3 held by being crossed with the path 2 is projected with the high lightness. Plural light source devices 10 are provided, and plural individual optical fibers attached at each light source device 10 and aggregated optical fibers attached to the projecting unit 1 are connected by an optical coupling means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light projecting system for a projector, and more particularly, to a light projecting system for a projector having a large amount of light for projecting a projected image held at a position crossing a projection optical path with high brightness.

[0002]

2. Description of the Related Art Conventional slide film projectors,
LCD projector, movie film projector, OHP
A projector such as a projector has an optical path (hereinafter, referred to as a projection optical path) in which a light source is attached at a start end and a lens optical system is provided at an end, and a slide film and a transmissive liquid crystal intersect with the projection optical path. In general, a panel, a movie film, an OHP film, or the like (hereinafter, referred to as an image to be projected) is held, and the light transmitted from the image to be projected among the light from the light source is output via a lens optical system. . The output is projected on, for example, a projection surface facing the lens optical system, and a projection image on the projection surface is used for observation.

[0003]

However, the conventional projector uses a halogen lamp or the like which emits a large amount of infrared rays (hereinafter, sometimes referred to as a heat ray) as a light source and projects an image to be projected near the light source. Therefore, if the wattage of the light source is increased, heat transfer from the light source may cause damage to the projected image. For example, when the image to be projected is a slide film, if the light source is a halogen lamp of several hundreds to several kilowatts and continuous projection is performed for about several tens of seconds or more, the film may be burned out or cause a fire if the film is remarkable. There is a fear.

Therefore, when the brightness of the light source (hereinafter, sometimes referred to as light amount) is increased in order to increase the brightness (hereinafter, sometimes referred to as lightness) of the projected image on the projection surface,
The time during which the projected image can be continuously projected may be limited to a very short time. In this case, a method of providing a heat ray absorbing filter between the light source and the slide film to protect the film has been proposed, but the projection of the performance of effectively shielding heat transfer from a halogen lamp of several hundred to several kilowatts has been proposed. A dexterous heat absorbing filter has not yet been developed. When the image to be projected is a liquid crystal panel, a light source that emits a large amount of heat rays cannot maintain good image optical characteristics of the liquid crystal, and may shorten the life of the liquid crystal panel. In short, the conventional projector has a problem that it is difficult to increase the light amount of the light source.

One method of increasing the brightness of a projected image on a projection surface without increasing the light amount of a light source of the projector is to hold a plurality of projectors with the same projected image or projected images created for three primary colors. A method of superposing and projecting the output of each projector on a projection plane (hereinafter referred to as a parallel projection method) has been performed. However, the conventional parallel projection method requires a plurality of projectors, and also requires a troublesome operation of superimposing a plurality of projection images on a projection plane.

SUMMARY OF THE INVENTION An object of the present invention is to provide a light projecting system for a projector which has a small amount of heat transfer and a large amount of light.

[0007]

In order to achieve the above object, the present inventor has paid attention to a solar lighting device using an optical fiber which suppresses heat rays. This sunlight illuminating device illuminates indoors, furniture, and the like with sunlight that suppresses heat rays. However, the amount of light was small and it was not suitable for projection by a projector. The present invention
The use of an optical fiber increases the light amount of a light source for a projector.

Referring to the embodiment of FIG. 1, the light projecting system for a projector according to the present invention is a light projecting system for a projector 1 which holds a projected image 3 by intersecting with a projection optical path 2. A large-intensity light source unit 11 that projects the projection image 3 with high brightness and a condenser lens system 12 that condenses heat rays of the light from the light source unit 11 at a position distant from the light source unit 11 compared to visible light are insulated. A light source device 10 housed in a flexible housing 13, and an optical fiber 7 having a light collecting end attached to a visible light condensing position of the light source device 10 and a light emitting end attached to a start end portion of the projection optical path 2 of the projector 1. It is.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a light projecting system according to the present invention comprises a light source device 10 independent of a projector 1, and an optical fiber 7 connecting the light source device 10 and the projector 1. You. The light source device 10 of FIG. 1 has a heat insulating housing 13 provided with a mounting hole 10a at the light collecting end of the optical fiber 7, and a light source unit 11 and a light collecting lens system 12 housed therein.

As shown in FIG. 3, there is known a condensing lens system 12 for condensing ultraviolet light, visible light, and heat rays of light from a light source at different distances from the light source by utilizing chromatic aberration. According to the present invention, the heat ray included in the light from the light source unit 11 is incident on the light collecting end of the optical fiber 7 by attaching the light collecting end of the optical fiber 7 to the light collecting position of the visible light by the light collecting lens system 12. Suppress. An example of the light source unit 11 is a xenon lamp or a discharge lamp having a large light amount of several hundreds to several kilowatts or more, and an example of the condenser lens system 12 is a Fresnel lens. Further, as the light source unit 11 and the condensing lens system 12, a conventional solar light condensing unit having a large amount of light can be used. Reference numeral 14 in FIG. 1 indicates a cooling supply / exhaust fan of the light source device 10.

In the light source device 10 shown in FIG. 1, the distance d between the light collecting end of the optical fiber 7 and the light source unit 11 and the light collecting device 12 can be adjusted. For example, the optical fiber 7 with respect to the mounting hole 10a
The distance d can be adjusted by the fitting depth of the light collecting end. Further, the light source device 10 of FIG. 1 includes a light source unit 11 and a condenser lens system 12 provided in a housing 13. However, a plurality of sets of light source units 11 and condenser lens systems 12 are provided in a housing 13 of the light source device 10, and the respective condenser lens systems 12 condense the visible light of each light source unit 11 to the same condensing position and collect the light. By attaching the light collecting end of the optical fiber 7 to the light position, the optical fiber 7
Can be increased. Multiple light sources 11
Is provided, each light source unit 11 can be a lamp of about several hundred watts.

The optical fiber 7 has a structure in which light incident from the light-collecting end is transmitted to the light-emitting end while being confined. The center core has extremely high transparency and is elongated and has a lower refractive index than the central core and has an outer periphery of the core. And a cylindrical cladding that covers the substrate in a cylindrical form. For example, an optical fiber having a large core cross-sectional area and a low transmission loss in the visible light region has been used as an image fiber for transmitting visible light (refer to Hiroshi Narita, "Optical Fiber Communication and Measurement Technology," Denki Shoin (Showa 61 This image fiber can be used as the optical fiber 7 of the present invention. In order to increase the amount of light guided to the projector 1, the optical fiber 7 of the present invention can be an optical fiber group in which a plurality of optical fibers are laid in parallel.

[0013] The light emitting end of the optical fiber 7 is attached to the start end of the projection optical path 2 of the projector 1 toward the end of the projection optical path 2;
The light transmitted through the optical fiber 7 is guided to the projection optical path 2. The projector 1 shown in FIG. 1 is mounted by fitting a light emitting end of an optical fiber 7 into a mounting hole 1a provided at a start end portion of a projection optical path 2. Light source device
The light source device 10 and the projector 1 can be separated from each other by making the mounting holes 10a, 1a of the projector 10 or the mounting holes 10a, 1a of the optical fiber detachable from the converging end or the light emitting end of the optical fiber. Can be achieved. Reference numeral 5 in FIG. 1 indicates an adjusting means such as a filter or a lens for adjusting the intensity or diffusion property of light output from the light emitting end.

The conventional projector makes the light source and the projected image adjacent to each other, so that heat from the light source can be transmitted to the projected image by conduction, convection and radiation. And the light source unit 11 is insulated from the heat insulating housing 13.
Since it is housed inside, the heat transfer from the light source unit 11 to the projector 1 due to conduction and convection is interrupted, and the heat transfer to the projected image 3 can be reduced. In the present invention, since visible light separated from heat rays by the condenser lens system 12 is incident on the condenser end of the optical fiber 7,
Heat transfer due to hot wire radiation can also be significantly reduced.

When the sunlight is condensed into heat rays and visible light by the condenser lens system 12 and the condensing end of the optical fiber 7 is positioned at the visible light condensing position, the ratio of the heat rays in the incident light Has been reported to be reduced by about 40% compared to the ratio of heat rays in sunlight. Therefore, according to the present invention, even when a high-intensity lamp of several hundreds to several kilowatts or more is used as the light source unit 11, the projected screen 3 is less likely to be damaged by the transferred heat, and is less likely than the conventional projector 1. High-brightness projection and long-time continuous projection of the projection target screen 3 can be performed.

Thus, the object of the present invention is to provide a "light projecting system for a projector which has a small amount of heat transfer and a large amount of light".

[0017]

FIG. 2 shows an embodiment of the present invention in which a plurality of light source devices 10 ₁ , 10 ₂ ,..., 10 _n are provided to increase the amount of light guided to the projector 1. Projection system of FIG. 2, the light source devices, respectively 10 _1, 10 _2, ..., a plurality of individual optical fibers 17 ₁ having a collection end attached to the visible light converging position of the 10 _n, 17 _2, ...
, 17 _n , a plurality of individual optical fibers 17 ₁ , 17 ₂ ,..., 17 _n , optical coupling means 19 to which all the light emitting ends are attached, and all the light emitting ends which are attached to the optical coupling means 19 And a light-collecting optical fiber 18 having a light-emitting end attached to the start end of the projection optical path 2 of the projector 1.

The individual optical fibers 17 ₁ , 17 ₂ ,..., 17 _n and the aggregated optical fiber 18 can have the same structure as the optical fiber 7 shown in FIG. It can be an optical coupler that belongs to it. As shown in FIG. 2, when a plurality of light source devices 10 ₁ , 10 ₂ ,..., 10 _n are provided in parallel, the light source unit 11 of each light source device 10 is not a large light source lamp of several kilowatts or more but several hundred watts. , A sufficiently large amount of light can be guided to the projector 1.

When a large-intensity lamp is used for the light source unit 11 of the light source device 10, or when a plurality of light source devices 10 ₁ , 10 ₂ ,.
.., When 10 _n are provided in parallel, the optical fiber 7 may generate heat. In such a case, a heat-resistant optical fiber can be used, and a cooling fluid flow path in contact with the optical fiber 7 is provided between the projector 1 and the light source device 10 to cool the optical fiber 7. Can be. As the cooling fluid, for example, air can be used, and when heat generation is large, a liquid can be used.

[0020]

As described above, in the light projecting system for a projector according to the present invention, a large light amount light source is accommodated in a heat insulating housing, and light from the light source is separated into visible light and heat rays by a condenser lens system. The light is condensed, and the light is guided to the projector by an optical fiber having a light collecting end attached to the visible light condensing position, so that the following remarkable effects are obtained.

(A) The brightness of the projected image on the projection surface can be increased while protecting the screen to be projected of the projector from heat transfer. (Mouth) It is possible to perform a long-time continuous projection of the projected screen as compared with a conventional projector. (C) By using the optical coupling means, the light amount of the light source can be adjusted by appropriately increasing or decreasing the number of light source means according to the brightness required for the projected image.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of one embodiment of the present invention.

FIG. 2 is an explanatory diagram of another embodiment of the present invention.

FIG. 3 is an explanatory diagram of light collection using chromatic aberration by a light collecting lens system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Projector 1a ... Mounting hole 2 ... Projection optical path 3 ... Projected image 5 ... Adjusting means 7 ... Optical fiber 7a ... Condensing end 7b ... Light emitting end 10 ... Light source device 10a ... Mounting hole 11 ... Light source part 12 ... Condensing Lens system 13 ... Heat-insulating housing 14 ... Supply / exhaust means 15 ... Light flux 17 ... Individual optical fiber 18 ... Integrated optical fiber 19 ... Optical coupling means

Claims (6)

[Claims] In a light projection system for a projector which holds an image to be projected while intersecting with a projection optical path, a large light amount light source unit for projecting the image to be projected with high brightness and a heat ray among light of the light source unit are visible. A light source device in which a condensing lens system for condensing light at a position distant from the light source unit in comparison with light is accommodated in a heat insulating housing, and a light condensing end attached to a visible light condensing position of the light source device and the projector A light projecting system for a projector, comprising: an optical fiber having a light emitting end attached to a start end portion of the projection optical path. 2. The light projecting system according to claim 1, wherein a plurality of said light source devices, a plurality of individual optical fibers each having a light collecting end attached to a visible light collecting position of each light source device, and said plurality of individual light beams. An optical coupling means having all the light emitting ends of the fiber attached thereto, and a secondary light collecting end attached to the optical coupling means for receiving the light flux from all the light emitting ends, and a starting end portion of a projection optical path of the projector. A light projecting system for a projector comprising an aggregated optical fiber having an attached light emitting end. 3. The light projecting system according to claim 1, wherein said condenser lens system is a Fresnel lens. 4. The light projecting system according to claim 1, wherein said light source unit is a xenon lamp or a discharge lamp. 5. A light projecting system for a projector according to claim 1, wherein said light source unit is a solar light collecting unit. 6. A light projecting system according to claim 1, further comprising a cooling fluid flow path in contact with said optical fiber between said projector and said light source device. Light system.