JP2003015222A - Light source device, projector using the same, and die of reflector for light source device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably converge light emitted from a light source on a predetermined converging point. SOLUTION: In a reflector 111B, a reflective surface 11 and a reference surface 14 are integrally formed by a reflective surface forming part 23A provided in one core 23 of a die 20 and a reference surface forming part 23B. Thereby, a deviation is not caused in a positional relationship between the reflective surface 11 and the reference surface 14 even when the thickness of a main body part 12 varies according to the amount of a glass material supplied to a lower die 21. Accordingly, the light emitted from the light source can reliably be converged on the converging point irrespective of the amount of the glass material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source device having a reflector made of glass, a projector using the light source device, and a molding die for molding the reflector.

[0002]

BACKGROUND ART Today, the development and research of projectors for enlarging and projecting images of personal computers and the like are active. In such a projector, the light emitted from the light source lamp is reflected by a reflector, the emitted light is modulated by an optical modulator such as a liquid crystal panel based on an image signal, and the modulated optical image is projected by a projection lens or the like. The configuration is such that enlarged projection is performed on the surface. Further, in a conventional projector, a light source device is composed of a light source lamp and a reflector having the light source lamp attached to its axis. FIG. 5 shows a schematic view of such a light source device 90.

In the light source device 90 shown in FIG. 5, a reflector 91 is held by a lamp housing 93. The reflector 91 is biased toward the upright surface 94 side of the lamp housing 93 by a linear spring member (not shown), and the peripheral edge 92 on the light emitting side thereof is in contact with the upright surface 94 of the lamp housing 93. The inner surface of the reflector 91 is a reflecting surface 95. The cross section parallel to the optical axis of the reflecting surface 95 (the central axis of the light flux emitted from the light source) has an elliptical shape, and the reflector 91
By arranging the light source C at the first focal point closer to, the luminous flux emitted from the light source C is condensed at the farther second focal point, that is, the focal point S.

A lamp housing 93 is provided on the peripheral edge 92 of the reflector 91 as shown in an enlarged view in FIG.
A reference surface 97 is formed so as to be in contact with the raised surface 94. In some cases, a protective glass 98 (illustrated by a chain double-dashed line) is provided on the step portion inside the reference surface 97, and the surface of the protective glass 98 on the light emitting side is the lamp housing 9.
In some cases, the surface that contacts the rising surface 94 via the protective glass 98, that is, the mounting surface of the protective glass 98 serves as the reference surface 99. The positions between the reference planes 97 and 99 and the light source C, the mounting position of the reflector 91 to the lamp housing 93, and the like are strictly controlled in order to maintain the positional accuracy of the condensing point S.

Such a reflector 91 is generally made of glass as a whole, and as shown in FIG. 6, a lower mold 81 having a concave cavity and a lower mold 81 are installed so as to surround the peripheral edge of the cavity. Holding die 82 and holding die 8
It is molded by a molding die 80 having a core 83 that slides inside the sliding opening of No. 2 toward the inside of the cavity of the lower die 81. That is, the softened glass material is supplied into the cavity of the lower die 81, the glass material is pressed by sliding the core 83, and the glass material is spread and expanded.
Fill within 0. As a result, the pressing mold 82 forms the reference surfaces 97 and 99, and the core 83 forms the reflecting surface 95.

[0006]

However, the glass material supplied to the molding die 80 is picked up by an operator by entwining it from the crucible to the tip of the rod, and the supply amount tends to vary. For this reason, if the supply amount is extremely large or, conversely, small, the sliding amount of the core 83 is extremely different, as indicated by the alternate long and short dash line in FIG. 6, and only the wall thickness of the reflecting surface 95 portion greatly changes. To do. Since such a variation in wall thickness is absorbed by the straight line portion 95A of the reflecting surface 95, it does not affect the overall external dimensions of the reflector 91, but the variation in wall thickness causes the reflecting surface 95 with respect to the reference surfaces 97 and 99. There is a problem in that the position of the condensing point S deviates from the predetermined position due to the positional deviation of. As a result, such problems have caused problems such as a decrease in illuminance of the projected screen and uneven illuminance.

An object of the present invention is to provide a light source device capable of arranging a condensing point of light emitted from a light source at a predetermined position, a projector using the light source device, and a mold for a reflector for the light source device. is there.

[0008]

A light source device according to claim 1 of the present invention comprises a light source lamp and a glass reflector for reflecting the light emitted from the light source lamp, and the light source lamp is the reflector. The light source device is attached to the lamp housing, and the reflector is attached to the lamp housing, and the peripheral edge of the reflector on the light emitting side is directly contacted with the lamp housing or is contacted via a light transmitting member. A reference surface to be in contact with is formed, and the reference surface of the reflector and the reflecting surface for reflecting the light are integrally molded by one core that constitutes a molding die of the reflector.

In such a structure, since the reference surface and the reflecting surface of the reflector are integrally molded by one core, the thickness of the reflecting surface varies depending on the amount of the glass material, but the position of the reflecting surface with respect to the reference surface is changed. Is constant regardless of the amount of glass material.

A light source device according to a second aspect of the present invention is characterized in that the reference surface of the reflector is formed by an end surface most protruding toward the light emitting side.

In such a structure, the reflecting surface of the reflector can be formed up to a position near the peripheral edge on the light emitting side, and the area of the reflecting surface becomes large. On the contrary, it is possible to bring the peripheral edge closer to the reflection surface side, and in such a case, the reflector can be downsized.

The projector according to claim 3 of the present invention is
What is claimed is: 1. A projector comprising: a modulator that modulates light emitted from a light source device; and a projection optical system that magnifies and projects the light flux modulated by the modulator to form a projected image, wherein the light source device comprises: The light source device according to claim 1 or claim 2.

A projector according to claim 4 of the present invention is
A color separation optical system that separates the light emitted from the light source device into a plurality of color lights, a plurality of light modulators that modulate the plurality of color lights for each color light according to image information, and a light modulator that is modulated by each light modulator. What is claimed is: 1. A projector comprising: a color combining optical system for combining colored lights; and a projection optical system for enlarging and projecting a light flux combined by the color combining optical system to form a projected image, wherein the light source device comprises: It is the light source device according to claim 1 or claim 2.

In the projectors according to the third and fourth aspects, in the light source device used, the light emitted from the light source is surely focused at a predetermined focusing point, so that the above-mentioned object can be achieved similarly. Also, as a projector,
It is less likely that the illuminance on the projected screen will decrease or unevenness will occur.

A mold for a reflector for a light source device according to a fifth aspect of the present invention is a mold for molding the reflector for a light source device according to the first or second aspect. Specifically, the lower mold to which the softened glass material is supplied, the pressing mold installed so as to surround the peripheral edge of the cavity of the lower mold, and the inside of the sliding opening of the pressing mold toward the lower mold cavity. A molding die for a reflector for a light source device, comprising a sliding core, which is used when the reflector is directly contacted with a lamp housing or with a light transmitting member. A reference surface forming portion that forms a reference surface and a reflecting surface forming portion that forms a reflecting surface that reflects the light emitted from the light source lamp are provided.

With such a structure, the reference surface and the reflection surface forming portion provided on the core integrally form the reference surface and the reflection surface of the reflector in one core, thereby achieving the above object.

In the mold for the reflector for a light source device according to claim 6 of the present invention, the sliding surfaces of the pressing mold and the core that are in contact with each other are set at positions where the outer peripheral portion of the reflector is formed. Is characterized by.

In such a structure, the core forms the end face of the reflector that protrudes to the most light emitting side, and if this end face is used as the reference face, the reflecting surface of the reflector is illuminated by the light. Increase the area of the reflecting surface by forming it closer to the edge on the exit side, or
The reflector can be miniaturized.

[0019]

[First Embodiment]

1. Structure of Optical System of Projector FIG. 1 shows structures of various optical systems of a projector 100 using the light source device according to the embodiment of the invention.
The projector 100 includes an integrator illumination optical system 110, a color separation optical system 120, a relay optical system 130, an electro-optical device 140, a cross dichroic prism 150 as a color combining optical system, and a projection lens 160 as a projection optical system. There is.

The integrator illumination optical system 110 comprises:
The light source device 111 including the light source lamp 111A and the reflector 111B, the first lens array 113, the second lens array 115, the reflecting mirror 117, and the superposing lens 1
19 and. The cross section parallel to the optical axis of the reflecting surface of the reflector 111B (the central axis of the light beam emitted from the light source) has an elliptical shape. The light emitting point in the light source lamp 111A, that is, the light source C is arranged near the first focus S1 closer to the reflector 111B. The light flux emitted from the light source lamp 111A is reflected by the reflector 111B to generate a second light beam.
After being reflected so as to be focused on the focal point S2, which is the focal point, it is made into substantially parallel light by the concave lens 112 arranged at an intermediate position up to the focal point S2. This light is further divided into a plurality of partial light fluxes by the first lens array 113, and enters the second lens array 115. Each partial light flux emitted from the second lens array 115 is converted into one type of polarized light by the polarization conversion element 116. Such a polarization conversion element 116 is introduced, for example, in Japanese Patent Laid-Open No. 8-304739. Each partial light flux converted into one type of polarized light by the polarization conversion element 116 is a superimposing lens 11
9 constitutes an electro-optical device 140 described later.
Liquid crystal panel 1 as one light modulator (light valve)
41 (liquid crystal panels 141R, 141G, 141 for each color light)
(Denoted as B).

The color separation optical system 120 includes two dichroic mirrors 121 and 122 and a reflection mirror 123. The dichroic mirrors 121 and 122 cause a plurality of partial light beams emitted from the integrator illumination optical system 110 to be red, It has a function of separating light of three colors of green and blue. The relay optical system 130 includes the incident side lens 13
1, relay lens 133, and reflection mirrors 135, 1
37, and has a function of guiding the color light separated by the color separation optical system 120, for example, blue light B to the liquid crystal panel 141B.

The electro-optical device 140 includes three liquid crystal panels 141R, 141G and 141B, which are light modulators, which use, for example, a polysilicon TFT as a switching element, and a color separation optical system. 12
Each color light separated by 0 is emitted from these three liquid crystal panels 14
The 1R, 141G, and 141B are modulated according to the image information to form an optical image. The cross dichroic prism 150 includes the three liquid crystal panels 141R and 141R.
The image modulated for each color light emitted from 1G and 141B is combined to form a color image. still,
In the prism 150, a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light are formed in a substantially X shape along the interfaces of the four rectangular prisms. The three colored lights are combined by. Then, the color image combined by the prism 150 is projected by the projection lens 16
It is emitted from 0 and enlarged and projected on the screen.

2. Structure of Light Source Device Light source lamp 111A that constitutes light source device 111 covers electrodes that are arranged to face each other, molybdenum foils connected to the ends of these electrodes that do not face each other, and each electrode and each molybdenum foil. It is a high pressure mercury lamp for AC lighting equipped with a light emitting tube. Then, when a voltage is applied between the electrodes, arc discharge occurs in the arc tube. In this embodiment, the substantially central portion of the arc thus generated is regarded as the light source C. As the light source lamp 111A, not only AC lighting but also DC lighting can be used.

As shown in FIG. 2, the reflector 111B has a semi-elliptical main body 12 whose inner surface is a mirror-like reflection surface 11, and a peripheral edge 13 of the main body 12 on the light emitting side.
A reference surface 14 to which a protective glass 98 as a light transmitting member is fixed by being adhered is provided, and an outer peripheral surface of the protective glass 98 is held on the outer peripheral side of the reference surface 14 as shown in an enlarged view in FIG. The holding portion 15 is provided with a convex portion 16 further protruding toward the light emitting side. On the other hand, an insertion hole 17 for inserting the light source lamp 111A is provided on the bottom side of the main body portion 12, and a fixing member 18 (FIG. 1) for fixing the light source lamp 111A is provided outside the insertion hole 17. A section 19 is provided. Such a reflector 111B is held by a linear spring material (not shown) in a state of being urged to the front surface side of the lamp housing (not shown), and is in contact with the front surface of the lamp housing via the protective glass 98. .

3. Structure of Mold of Reflector Mold In FIG. 3, the reflector 111 B is molded by the mold 20. Although the entire molding die 20 is omitted, a lower die 21 having a concave cavity 21A and a lower die 21
The pressing die 22 installed so as to surround the peripheral edge of the cavity 21A of the lower die 2 and the sliding opening 22A of the pressing die 22 in the lower die 2
The core 23 is slid toward the inside of the first cavity 21A.

In the cavity 21A of the lower die 21, mainly the outer peripheral portion of the main body 12 and the fixed portion 19 (FIG. 2) of the reflector 111B are formed. In the pressing die 22, the lower die 21
The holding portion 15 of the reflector 111B is formed with a part of the above. The pressing die 22 has a convex portion 1 of the holding portion 15.
6 is provided with a concave portion 22B, and by pressing the pressure of the expanded glass material to the concave portion 22B, the sliding opening 22 of the pressing die 22 is formed.
The pressure acting on the boundary portion between the A peripheral edge and the core 23 is reduced to extend the life of the molding die 20. The inner peripheral surface of the sliding opening 22A has a sliding surface 22 on which the core 23 slides.
It is C.

The core 23 is provided with a reflecting surface forming portion 23A for forming the reflecting surface 11 of the reflector 111B and a reference surface forming portion 23B for forming the reference surface 14, respectively. The surface 14 is integrally formed with the core 23. In addition, the sliding opening 22 of the pressing die 22
The sliding surface 23C of the core 23 protruding from A forms the inner peripheral surface 15A of the holding portion 15 that faces the outer peripheral surface of the protective glass 98. In these sliding surfaces 23C (inner peripheral surface 15A as the reflector 111B), the vertical dimension h in the figure varies depending on the amount of glass material supplied to the lower mold 21. That is, when the amount of glass material is large, the sliding amount becomes small and the vertical dimension h becomes small
The wall thickness of the main body 12 on which the reflecting surface 11 is formed is increased.
On the other hand, when the amount of glass material is small, the sliding amount becomes large, the vertical dimension h becomes large, and the thickness of the main body 12 becomes thin. However, in any case, the positional relationship between the reference surface 14 and the reflecting surface 11 does not deviate.

4. Effects of Embodiments (1) In the reflector 111 </ b> B that constitutes the light source device 111 of the projector 100, the reflecting surface 11 and the reference surface 14 are provided in the core 23 of the molding die 20, and the reflecting surface forming portion 2 is provided.
Since 3A and the reference surface forming portion 23B are integrally formed, even if the thickness of the main body portion 12 varies due to the amount of the glass material supplied to the lower mold 21, the reflection surface 11 and the reference surface 14 are The positional relationship does not shift. Therefore, the light source C
It is possible to reliably condense the light emitted from the condensing light at a predetermined condensing point S2 (FIG. 5) on the side of the integrator illumination optical system 110 regardless of the amount of the glass material.

(2) Since the predetermined position accuracy of the condensing point S2 of the emitted light is good, the projector 100 is less likely to cause a decrease in illuminance or uneven illuminance on the projected screen projected on the screen, thus improving the image quality. Can be made.

(3) Since the protective glass 98 is fixed to the reference surface 14 of the reflector 111B, the reflector 111B
It is possible to make it difficult for foreign matter such as dust and the like to enter the inside, and even if the light source lamp 111A is damaged for some reason, it is possible to prevent the fragments and the like from scattering inside the device of the projector 100.

(4) The pressing die 22 is provided with a concave portion 22B. In order to concentrate the pressure of the glass material on the concave portion 22B, the peripheral edge of the sliding opening 22A of the pressing die 22 and the sliding surface 23C of the core 23 are formed. It is possible to reduce the pressure exerted on the boundary part of the mold and to extend the life of the molding die 20.

[Second Embodiment] FIG. 4 shows another embodiment of the reflector and its molding die according to the present invention. In FIG. 4, the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted or simplified.

In the reflector 111B of this embodiment, the most projecting end surface of the peripheral edge 13 on the opening side is the reference surface 14.
It is said that. Such a reference surface 14 is directly brought into contact with a lamp housing (not shown), and the protective glass is arranged, for example, in a protective glass relief portion of the lamp housing.

On the other hand, in the molding die 20, the pressing die 2
2 and the sliding surface 22C, 23C of the core 23 which are in contact with each other
Is set at a position forming the outer peripheral side of the reflector 111B. Therefore, the sliding surface 22C of the pressing die 22 projects below the sliding surface 23C of the core 23 in the figure,
The protruding sliding surface 22C forms a part of the outer circumference of the reflector 111B.

In addition, the reflecting surface 11 of the reflector 111B
It is the same as the first embodiment in that the reference surface 14 and the reference surface 14 are integrally formed by the reflection surface forming portion 23A and the reference surface forming portion 23B provided in one core 23.

With such a configuration, the effects (1) and (2) described in the first embodiment can be obtained in the same manner, and the following effects can be obtained. (5) Since the protective glass is not arranged on the peripheral edge 13 of the reflector 111B, the step difference for mounting the protective glass can be reduced. Therefore, if the size of the main body 12 is set to be the same as that of the first embodiment, the area of the reflecting surface 11 can be increased by the amount of the reduced step. Further, if the size of the reflecting surface 11 is set to be the same as that of the first embodiment, the peripheral portion 13 can be made smaller by the amount of the step difference, and the miniaturization of the reflector 111B can be promoted.

The present invention is not limited to the above-described embodiment, but includes other configurations and the like that can achieve the object of the present invention, and the following modifications and the like are also included in the present invention.

For example, in the first embodiment, the depression 22B is provided in the pressing die 22 to extend the life, but such a depression 22B may be provided as necessary. It may be omitted as indicated by the alternate long and short dash line.

Further, in the core 23 of the second embodiment, as shown by the alternate long and short dash line in FIG. 4, the reference surface 14 is formed by the convex portion 23D of the core, and the convex portion 23D is pressed by the glass material. May be concentrated to extend the life, and further, as shown by the chain double-dashed line, the step between the reference surface 14 and the reflecting surface 11 may be eliminated to form the reflecting surface 11 larger, or The reflector 111B may be made smaller.

In short, in the reflector 111B, it is sufficient that the reflecting surface 11 and the reference surface 14 are integrally formed by one core 23, and the shape and the like of the peripheral edge 13 thereof may be arbitrarily determined in practice.

The light source lamp used in the light source device of the present invention is not limited to a high pressure mercury lamp, but may be a xenon lamp or a metal halide lamp.

In addition, various optical systems of the projector are not limited to the above-mentioned configurations, and specific arrangement positions of each optical system, specific shapes of members forming each optical system, materials of members excluding the reflector, and the like. May be arbitrarily determined in the implementation.

In the above embodiment, an example of a projector using three light modulation devices has been described, but the light source device of the present invention uses one, two, or four or more light modulation devices. It can also be applied to other projectors. Further, the light modulator is not limited to the transmissive liquid crystal panel, but a reflective liquid crystal panel or a device using a micromirror can be adopted by appropriately changing the configuration of the optical system.
Furthermore, there are two types of projectors, a front type that projects from the front side of the screen and a rear type that projects from the back side of the screen, but the present invention is applicable to either type.

[0044]

As described above, according to the present invention,
Regardless of the amount of glass material supplied for forming the reflector, the positional relationship between the reference surface and the reflecting surface of the reflector can be made constant, and the light emitted from the light source can be reliably focused at a predetermined focusing point. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a plan view showing a main part of a projector according to a first embodiment of the invention.

FIG. 2 is a sectional view showing a reflector used in the light source device of the embodiment.

FIG. 3 is a cross-sectional view showing an enlarged main part of the reflector.

FIG. 4 is an enlarged sectional view showing a main part of a reflector according to a second embodiment of the present invention.

FIG. 5 is a schematic view showing a conventional technique of the present invention.

FIG. 6 is a cross-sectional view showing an enlarged main part of the conventional technique.

[Explanation of symbols]

11 Reflection Surface 13 Edge 14 Reference Surface 20 Mold 21 Lower Mold 22 Pressing Mold 22A Sliding Openings 22C, 23C Sliding Surface 23 Core 23A Reflection Surface Forming Section 23B Reference Surface Forming Section 98 Protective Glass 100 Projector 111 Light source device 111A Light source lamp 111B Reflector 120 Color separation optical system 141, 141R, 141G, 141B Light modulator 150 Cross dichroic prism 160 which is a color combining optical system Projection optical system

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) // F21Y 101: 00 (72) Inventor Atsushi Miyazawa 3-3-5 Yamato, Suwa-shi, Nagano Seiko Epson shares In-house (72) Inventor Shuji Tamaru Osaka Prefecture Kadoma City 1006 Kadoma, Matsushita Electric Industrial Co., Ltd. BB05 BB18 BE01 5C058 AA06 AB03 BA05 BA23 BA29 EA01 EA02 EA26 EA42 EA51

Claims (6)

[Claims] 1. A light source lamp, and a glass reflector for reflecting light emitted from the light source lamp,
A light source device in which the light source lamp is attached to the reflector, and the reflector is attached to a lamp housing, wherein a peripheral edge of a light emitting side of the reflector is directly contacted with the lamp housing or is A reference surface that is in contact with the transparent member is formed, and the reference surface of the reflector and the reflection surface that reflects the light are integrally molded by one core that constitutes the molding die of the reflector. Characteristic light source device. 2. The light source device according to claim 1, wherein the reference surface of the reflector is formed by an end surface most protruding toward the light emitting side. 3. A projector comprising: a modulator that modulates light emitted from a light source device; and a projection optical system that magnifies and projects the light flux modulated by the modulator to form a projected image, A projector, wherein the light source device is the light source device according to claim 1. 4. A color separation optical system that separates the light emitted from the light source device into a plurality of color lights, and a plurality of light modulators that modulate the plurality of color lights for each color light according to image information.
A projector provided with a color combining optical system for combining the color lights modulated by the respective light modulators, and a projection optical system for enlarging and projecting the light fluxes combined by the color combining optical system to form a projected image, The projector according to claim 1, wherein the light source device is the light source device according to claim 1. 5. A lower mold to which a softened glass material is supplied, a pressing mold installed so as to surround a peripheral edge of the cavity of the lower mold, and an inside of a sliding opening of the pressing mold is directed into the cavity of the lower mold. A mold for a reflector for a light source device, comprising: a core that slides and slides when the reflector is directly contacted with the lamp housing or with a light transmitting member. 1. A molding die for a reflector for a light source device, comprising: a reference surface forming portion that forms a reference surface and a reflecting surface forming portion that forms a reflecting surface that reflects light emitted from a light source lamp. 6. The molding die for a reflector for a light source device according to claim 5, wherein a sliding surface of the pressing die and the core that are in contact with each other is set at a position that forms an outer peripheral portion of the reflector. A mold for a reflector for a light source device, which is characterized in that