JP2011248174A - Light source device and projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device in which degrading due to a light flux is suppressed.SOLUTION: The light source device 31 includes a light source; a light source case 6 for storing the light source; a parallelizing lens 313 which is arranged in the light source case 6 and transmits a light flux emitted by the light source; a reflection film 8 which is formed on the parallelizing lens 313 made of glass, and is formed by depositing aluminum or the like; and a light shielding film 7 formed in the light source case 6 and made of a metal plate of aluminum or the like.

Description

  The present invention relates to a light source device that emits a light beam and a projector including the light source device.

  2. Description of the Related Art Conventionally, there has been known a projector that modulates and projects a luminous flux emitted from a light source device according to image information. In recent years, the brightness of projected images has been further increased, and a high-intensity light source such as an ultra-high pressure mercury lamp is used as a light source device. And since the light source housing that houses the light source is irradiated with a high-luminance light beam from the light source, a technique for suppressing light degradation and thermal degradation of the light source housing has been proposed (for example, Patent Documents). 1).

  The light source device described in Patent Document 1 includes a light source, a reflector that reflects a light beam emitted from the light source, a collimating lens that aligns the direction of the light beam emitted from the reflector, and a holding member that holds the collimating lens. I have. The holding member has a housing for light source (holding member main body) made of synthetic resin and an absorbing member disposed inside thereof, and has a double structure. The absorbing member is formed of a metal plate such as aluminum, and is configured to shield the light flux from the light source from the inside of the light source casing.

JP 2006-106656 A

  However, although the technique described in Patent Document 1 suppresses light from being irradiated to the inside of the light source casing by the absorbing member, the portion of the light source casing that holds the collimating lens is used. Is irradiated with the light beam from the collimating lens. That is, among the light beams emitted from the light source, a light beam that cannot be optically controlled and becomes stray light from the parallelizing lens is emitted to the light source casing. When the stray light is irradiated to the light source housing, a part of the material may float in a gaseous state or be deformed due to light deterioration or heat deterioration. When the housing for the light source deteriorates, the light source device has a deterioration in optical characteristics due to a decrease in luminance due to a part of the gaseous floating material adhering to the collimating lens or reflector, or due to a displacement of the collimating lens. There is a problem. In addition, in order to prevent stray light from being applied to the light source housing, when the absorbing member is also disposed between the collimating lens and the light source housing, the collimating lens is accurately used for the light source. There is a problem that it is difficult to arrange in the housing or the light source device is enlarged.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A light source device according to this application example includes a light source, a light source housing that houses the light source, and a light transmission member that is disposed in the light source housing and transmits a light beam emitted from the light source. And a light shielding film interposed between the light source casing and the light transmission member.

As the light transmitting member, an optical component that optically processes the light beam emitted from the light source, or a cover member for protecting the light source and preventing the scattering of the damaged object to the outside when the light source is damaged Etc. According to this configuration, since the light-shielding film is interposed between the light source casing and the light transmission member, the light beam emitted from the light source cannot be optically controlled and becomes stray light. It becomes possible to block the light flux from the transmitting member toward the light source casing.
Therefore, the light source casing suppresses the generation of gas due to the absorption of stray light from the light transmitting member and the deterioration such as thermal deformation, and the light source device allows the gaseous floating material to adhere to the light transmitting member. The positional deviation of the light transmission member due to the deformation of the light source casing is suppressed. Further, by forming the light shielding film thin, it is possible to arrange the light transmitting member with high accuracy with respect to the light source casing.
Therefore, the light source device can suppress deterioration of luminance and luminance unevenness due to deterioration of the light source casing, and can emit a light beam having stable optical characteristics over a long period of time. That is, the life of the light source device can be extended.

  Application Example 2 In the light source device according to the application example, it is preferable that the light shielding film includes a reflective film formed on the light transmitting member.

  According to this configuration, the light transmission member is provided with the reflection film as the light shielding film between the light source casing. Examples of the reflective film include a thin film such as a metal film formed by processing such as vapor deposition or sputtering. Accordingly, it is possible to suppress the stray light from the light transmitting member from being reliably reflected by the reflective film and irradiated to the light source casing. Therefore, in the light source device, deterioration of the light source casing due to stray light from the light transmitting member is suppressed, and a light beam having stable optical characteristics can be emitted over a long period of time.

  Application Example 3 In the light source device according to the application example, it is preferable that the light shielding film includes a light absorption film formed on the light source casing.

  According to this configuration, the light source casing is provided with the light absorbing film as the light shielding film between the light transmitting member. Examples of the light absorbing film include a coating film formed by painting or coating a material that absorbs a light beam. As a result, it is possible to easily stray light between the light transmitting member and the light source casing to absorb stray light and prevent the light source casing from being irradiated. Therefore, in the light source device, deterioration of the light source casing due to stray light from the light transmitting member is suppressed, and a light beam having stable optical characteristics can be emitted over a long period of time.

  Application Example 4 A projector according to this application example includes the light source device described above, a light modulation device that modulates the light beam emitted from the light source device, and a projection lens that projects the light beam modulated by the light modulation device. And.

  According to this configuration, since the projector includes the light source device described above, the light beam having stable optical characteristics from the light source device is modulated to display an image with good image quality and brightness over a long period of time. Is possible.

1 is a schematic diagram showing a schematic configuration of a projector according to a first embodiment. The perspective view of the light source device of 1st Embodiment. The disassembled perspective view of the light source device of 1st Embodiment. The fragmentary sectional view which shows typically the light source device of the parallelization lens vicinity of 1st Embodiment. The fragmentary sectional view which shows typically the light source device of the parallelization lens vicinity of 2nd Embodiment.

(First embodiment)
Hereinafter, the projector according to the first embodiment will be described with reference to the drawings.
The projector according to the present embodiment modulates a light beam emitted from a light source according to image information and enlarges and projects it on a screen or the like.
FIG. 1 is a schematic diagram illustrating a schematic configuration of a projector according to the present embodiment.
As shown in FIG. 1, a projector 1 includes an exterior casing 2 that constitutes an exterior, a control unit (not shown), an optical unit 3 having a light source device 31, and a power supply device that supplies power to the light source device 31 and the control unit. 4 etc. Although illustration is omitted, a cooling fan or the like for cooling the inside of the projector 1 is disposed in the exterior housing 2.

  The control unit includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and functions as a computer, and is related to control of the operation of the projector 1, for example, image projection. Control and so on.

The optical unit 3 optically processes and projects the light beam emitted from the light source device 31 under the control of the control unit.
As shown in FIG. 1, the optical unit 3 includes an integrator illumination optical system 32, a color separation optical system 33, a relay optical system 34, an electro-optical device 35, a projection lens 36, and these optical components 31 in addition to the light source device 31. To 36 are arranged at predetermined positions on the optical path.

  The light source device 31 includes a discharge-type light source 311, such as an ultra-high pressure mercury lamp or a metal halide lamp, a reflector 312 and a collimating lens 313 as a light transmitting member, and is configured to be detachable from the optical component casing 5. Yes. The light source device 31 reflects the light beam emitted from the light source 311 by the reflector 312, aligns the emission direction by the collimating lens 313, and emits the light toward the integrator illumination optical system 32. The light source device 31 will be described later in detail.

The integrator illumination optical system 32 includes a first lens array 321, a second lens array 322, a polarization conversion element 323, and a superimposing lens 324.
The first lens array 321 is an optical element that divides the light beam emitted from the light source device 31 into a plurality of partial light beams, and is matrixed in a plane substantially orthogonal to the optical axis L of the light beam emitted from the light source device 31. A plurality of small lenses arranged in a shape.

The second lens array 322 has substantially the same configuration as the first lens array 321, and together with the superimposing lens 324, a partial light beam emitted from the first lens array 321 is superimposed on the surface of a liquid crystal light valve 351 described later. Let
The polarization conversion element 323 has a function of aligning randomly polarized light emitted from the second lens array 322 with substantially one type of polarized light that can be used by the liquid crystal light valve 351.

  The color separation optical system 33 includes two dichroic mirrors 331 and 332 and a reflection mirror 333, and the light emitted from the integrator illumination optical system 32 is converted into red light (hereinafter referred to as “R light”) and green light (hereinafter referred to as “R”). G light ”) and blue light (hereinafter referred to as“ B light ”).

  The relay optical system 34 includes an incident side lens 341, a relay lens 343, and reflection mirrors 342 and 344, and has a function of guiding the R light separated by the color separation optical system 33 to the liquid crystal light valve 351R for R light. The optical unit 3 has a configuration in which the relay optical system 34 guides the R light. However, the configuration is not limited thereto, and may be configured to guide the B light, for example.

  The electro-optical device 35 includes a liquid crystal light valve 351 as a light modulation device and a cross dichroic prism 352 as a color synthesis optical device, and modulates each color light separated by the color separation optical system 33 according to image information.

  The liquid crystal light valve 351 is provided for each of the three color lights (the liquid crystal light valve for R light is 351R, the liquid crystal light valve for G light is 351G, and the liquid crystal light valve for B light is 351B). Each has a transmissive liquid crystal panel, and an incident-side polarizing plate and an emitting-side polarizing plate arranged on both sides thereof.

  The liquid crystal light valve 351 has a rectangular pixel region in which minute pixels (not shown) are formed in a matrix, each pixel is set to a light transmittance corresponding to a display image signal, and a display image is formed in the pixel region. To do. Each color light separated by the color separation optical system 33 is modulated by the liquid crystal light valve 351 and then emitted to the cross dichroic prism 352.

  The cross dichroic prism 352 has a substantially square shape in plan view in which four right angle prisms are bonded together, and two dielectric multilayer films are formed on the interface where the right angle prisms are bonded together. In the cross dichroic prism 352, the dielectric multilayer film reflects the color light modulated by the liquid crystal light valves 351R and 351B, transmits the color light modulated by the liquid crystal light valve 351G, and synthesizes each color light.

  The projection lens 36 is configured as a combined lens combining a plurality of lenses, and enlarges and projects the light modulated by the liquid crystal light valve 351 and synthesized by the cross dichroic prism 352 on the screen.

  Although not shown in detail, the power supply device 4 includes a power supply block and a light source drive block that drives the light source device 31, and supplies power to electronic components such as the control unit and the light source 311. The light source drive block includes an output connector connected to the light source device 31, and this output connector is arranged in the optical component casing 5 via a cable.

Here, the light source device 31 will be described in detail.
2 to 4 are diagrams showing the light source device 31. 2 is a perspective view of the light source device 31, FIG. 3 is an exploded perspective view of the light source device 31, and FIG. 4 is a partial cross-sectional view schematically showing the light source device 31 in the vicinity of the parallelizing lens 313. . Note that FIG. 4 is a diagram in which a lens mounting plate 314, which will be described later, is omitted. In order to make each component large enough to be recognized on the drawing, dimensions and ratios of each component are appropriately determined as actual ones. It is different. In the following, for convenience of explanation, the direction in which the light beam is emitted from the light source device 31 is orthogonal to the + X direction, the direction in which image light is projected from the projection lens 36 is orthogonal to the + Y direction, the X direction, and the Y direction. The top in the drawing is described as the + Z direction (upward direction). That is, the ± X direction is the optical axis L direction.

  In addition to the light source 311, the reflector 312, and the collimating lens 313, the light source device 31 includes a lens mounting plate 314, an input connector 315, a light source housing 6, and a light shielding member 7 (see FIG. 4). ing.

As shown in FIGS. 3 and 4, the collimating lens 313 is disposed on the light emission side of the light source housing 6, and transmits the light emitted from the light source 311 (see FIG. 1).
The collimating lens 313 is made of glass and is formed to have a small diameter portion 3131 and a large diameter portion 3132 having different external dimensions, and the small diameter portion 3131 whose external dimensions are smaller than the large diameter portion 3132 is formed on the light beam incident side (−X Side). The collimating lens 313 has a concave surface 313A (see FIG. 4) in which the end surface on the light beam incident side of the small diameter portion 3131 is formed in a concave shape, and the + Y side and −Y side ends of the large diameter portion 3132 are formed flat. And a flat portion 3133 (see FIG. 3).

  As shown in FIG. 4, the outer peripheral surface of the small diameter portion 3131, the outer peripheral surface of the large diameter portion 3132, and the step surface 313 </ b> B that forms a step between the small diameter portion 3131 and the large diameter portion 3132 have a reflective film as a light shielding film. 8 is formed. The reflection film 8 is a thin film that reflects a light beam formed by vapor deposition of aluminum, chromium, or the like, and the thickness thereof is sufficiently within the dimensional tolerance of the parallelizing lens 313 that does not include the reflection film 8. Is formed. The reflective film 8 is not limited to vapor deposition, and may be formed by sputtering or the like, and may be a dielectric multilayer film in which a plurality of thin films are stacked.

  The lens mounting plate 314 is a member for narrowing the collimating lens 313 with the light source housing 6 and is formed of a plate material having a spring property such as stainless steel. As shown in FIG. 3, the upper and lower ends of the lens mounting plate 314 are bent to the −X side, and rectangular holes 3141 are formed in the bent portions. In addition, a light beam reflected by the reflector 312 passes through the center portion of the lens mounting plate 314, and a round hole 3142 having an inner diameter smaller than the outer diameter of the large diameter portion 3132 of the parallelizing lens 313 is formed.

  The input connector 315 is a connection portion that is electrically connected to the power supply device 4 and is disposed on the −X side of the light source housing 6 as illustrated in FIG. 3. The input connector 315 is connected to an electrode (not shown) of the light source 311 via the cable CA. The input connector 315 is connected to the output connector of the power supply device 4 when the light source device 31 is inserted into the optical component casing 5.

The light source housing 6 accommodates the light source 311 and the reflector 312 inside, and the collimating lens 313 and the input connector 315 are arranged as described above.
The light source casing 6 is made of a synthetic resin such as polyphenylene sulfide or liquid crystal polymer containing glass filler, and is formed in a substantially rectangular parallelepiped box shape. As shown in FIG. 3, an opening 61 into which the small diameter portion 3131 of the collimating lens 313 is inserted is formed on the wall surface on the + X side of the light source housing 6, and outside the opening 61 in the + X direction. A cylindrical part 62 that protrudes and has an inner diameter dimension larger than the outer dimension of the large diameter part 3132 is provided. A plurality of ribs 63 for positioning the collimating lens 313 are provided on the inner surface of the cylindrical portion 62.

In addition, a flat surface substantially along the XY plane is formed in the vertical direction of the cylindrical portion 62 of the light source housing 6, and the square hole 3141 of the lens mounting plate 314 is associated with this flat surface. A locking portion 64 to be stopped is provided.
After the small diameter portion 3131 is inserted into the opening 61, the collimating lens 313 is held by the light source housing 6 with the lens mounting plate 314 locked by the locking portion 64. The collimating lens 313 is pressed by the lens mounting plate 314 when the lens mounting plate 314 is locked to the locking portion 64, and the large diameter portion 3132 contacts the rib 63, as shown in FIG. Positioned on the light source casing 6. The reflective film 8 is interposed between the light source casing 6 and the collimating lens 313.

  The light shielding member 7 is formed of a metal plate material such as aluminum, and is disposed inside the light source casing 6. Specifically, although the detailed illustration of the light shielding member 7 is omitted, from the edge of the opening 61 to the outside of the + X side edge of the reflector 312 along the inner surface 6A of the light source housing 6 (see FIG. 4). Is formed. The light shielding member 7 may be formed such that the surface is subjected to black alumite treatment, or the surface is roughened by corrosion processing, etching, or the like.

  The light beam emitted from the light source 311 is emitted with its direction aligned by the collimating lens 313, while the light beam directed to the light source housing 6 is shielded by the light shielding member 7 and the reflective film 8. Specifically, as shown in FIG. 4, among the light beams emitted from the light source 311, the light beam L <b> 1 toward the inner surface 6 </ b> A of the light source housing 6 is shielded by the light shielding member 7. The light beam L2 incident on the collimating lens 313 is emitted in the same direction, while a part of the light beam L2 is not controlled optically and becomes stray light and travels toward the light source housing 6, but becomes this stray light. The light beam L3 is reflected by the reflective film 8.

As described above, according to the projector 1 of the present embodiment, the following effects can be obtained.
(1) In the light source device 31, the reflection film 8 is provided between the light source housing 6 and the parallelizing lens 313 in addition to the light shielding member 7. As a result, not only the light beam L1 directed to the inner surface 6A but also the light beam L3 directed from the collimating lens 313 to the light source housing 6 can be shielded. Therefore, the light source housing 6 is prevented from being deteriorated due to gas generation or thermal deformation due to the absorption of the light flux, and the light source device 31 is such that the gas floating material adheres to the collimating lens 313 and the reflector 312. In addition, displacement of the collimating lens 313 due to deformation of the light source housing 6 is suppressed. Further, since the thickness of the reflective film 8 is formed with a dimension that is sufficiently within the dimensional tolerance of the collimating lens 313 that does not include the reflective film 8, even if the reflective film 8 is interposed, the collimating lens 313 is A highly accurate arrangement with respect to the light source casing 6 is possible.
Therefore, the light source device 31 can suppress deterioration in luminance and luminance unevenness due to deterioration of the light source housing 6 and can emit a light beam having stable optical characteristics over a long period of time.

  (2) Since the reflective film 8 is formed of aluminum or the like by vapor deposition or the like, the outer peripheral surface of the small diameter portion 3131, the outer peripheral surface of the large diameter portion 3132, and the step surface even if the reflective film 8 has a step surface 313B or the like. It becomes possible to form 313B without unevenness. Therefore, the light beam L3 can be reliably shielded, the degree of freedom in designing the collimating lens 313 and the light source housing 6 can be improved, the size of the collimating lens 313 and the light source housing 6 can be reduced, and the light source device 31. Can be miniaturized.

  (3) Since the light beam L3 from the collimating lens 313 can be shielded without arranging other parts between the collimating lens 313 and the light source housing 6, the number of parts increases and the size of the light source device 31 increases. Can be suppressed.

  (4) Since the deterioration of the light source casing 6 is suppressed, choices of materials to be used are widened, and it becomes possible to reduce the weight, reduce the cost, and facilitate the molding.

  (5) Since the projector 1 includes the light source device 31 described above, the light beam having stable optical characteristics from the light source device 31 is modulated to display an image with good image quality and brightness over a long period of time. Is possible.

(Second Embodiment)
Next, a projector 1 according to a second embodiment will be described with reference to the drawings. In the following description, the same structure and the same members as those of the projector 1 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
The projector 1 of this embodiment includes a light source device 131 having a configuration different from that of the light source device 31 of the first embodiment.

FIG. 5 is a partial cross-sectional view schematically showing the light source device 131 in the vicinity of the collimating lens 1313. 5 is a view in which the lens mounting plate 314 is omitted as in FIG. 4. In order to make each component large enough to be recognized on the drawing, the dimensions and ratios of each component are actually set. It is different from what is appropriate.
As shown in FIG. 5, the light source device 131 is different from the light source device 31 of the first embodiment in that the light shielding member 7 is omitted, the collimating lens 1313 in which the reflective film 8 is not formed, and a light shielding film. A light source casing 16 having a light absorbing film 9 is provided.

  The light absorption film 9 has a function of absorbing a light beam. In this embodiment, an insulating black paint (inorganic coat manufactured by Suncoat Co., Ltd.) containing a composite oxide of copper, iron and manganese is used. Yes. Further, this paint has a function of efficiently shielding light against ultraviolet rays.

  As shown in FIG. 5, the light absorbing film 9 has a surface facing the collimating lens 1313 in addition to the inner surface 16 </ b> A of the light source casing 16, specifically, the inner peripheral surface of the opening 61 and the cylindrical portion 62. It is formed on the inner surface and the inner surface of the rib 63. That is, the light absorption film 9 is interposed between the light source casing 16 and the collimating lens 1313 as a light transmission member. Further, the light absorption film 9 is formed so that the thickness thereof is sufficiently within the dimensional tolerance of the light source casing 16 that does not include the light absorption film 9.

  The light beam emitted from the light source 311 is emitted with its direction aligned by the collimating lens 1313, while the light beam directed to the light source housing 16 is shielded by the light absorption film 9. Specifically, as shown in FIG. 5, among the light beams emitted from the light source 311, the light beam L 1 that travels toward the inner surface 16 A of the light source housing 16 and the light beam L 3 that travels from the collimating lens 1313 toward the light source housing 16 are And is absorbed by the light absorption film 9.

As described above, according to the projector 1 of the present embodiment, the following effects can be obtained in addition to the effects of the first embodiment.
In addition to the inner surface 16 </ b> A, the light source casing 16 is provided with a light absorption film 9 between the collimating lens 1313. Accordingly, it is possible to suppress the light beam from being irradiated onto the light source casing 16 with a simple configuration without increasing the number of parts. Therefore, it is possible to further reduce the size of the light source device 131, simplify the manufacturing process, and reduce the cost while suppressing deterioration of the light source casing 16.

(Modification)
In addition, you may change the said embodiment as follows.
The light source devices 31 and 131 of the embodiment include the collimating lenses 313 and 1313 as light transmitting members, but are not limited to the collimating lenses 313 and 1313, and other optical components and the light source 311 are protected. The present invention can also be applied to a light source device provided with a cover member or the like for preventing the damage from being scattered outside when the light source 311 is damaged. And you may comprise so that a light shielding film may be interposed between this light transmissive member and the light source housing.

  You may provide both the reflecting film 8 and the light absorption film 9 in the light source device 31 and 131 of the said embodiment. For example, in the light source device 31 of the first embodiment, the light-shielding member 7 may be deleted, and the light absorbing film 9 may be formed on the inner surface 6A of the light source housing 6 or the surface facing the inner surface 6A and the parallelizing lens 313. Good. In the light source device 131 of the second embodiment, the reflective film 8 may be provided on the outer peripheral surface of the small diameter portion 3131, the outer peripheral surface of the large diameter portion 3132, and the step surface 313B of the parallelizing lens 1313.

  The projector 1 according to the embodiment uses the transmissive liquid crystal light valve 351 as the light modulation device, but may use a reflective liquid crystal light valve.

  The light source device 31 of the embodiment employs a discharge-type light source 311, but uses various solid-state light emitting elements such as a laser diode, an LED (Light Emitting Diode), an organic EL (Electro Luminescence) element, and a silicon light emitting element. It can also be applied to a conventional light source device.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 3 ... Optical unit, 6,16 ... Light source housing, 7 ... Light shielding member, 8 ... Reflection film, 9 ... Light absorption film, 31, 131 ... Light source device, 61 ... Opening, 62 ... Cylindrical shape 63, rib, 311 ... light source, 312 ... reflector, 313, 1313 ... collimating lens, 351, 351B, 351G, 351R ... liquid crystal light valve.

Claims (4)

A light source;
A light source housing that houses the light source;
A light transmissive member that is disposed in the light source casing and transmits a light beam emitted from the light source;
A light shielding film interposed between the light source casing and the light transmission member;
A light source device comprising: The light source device according to claim 1,
The light source device, wherein the light shielding film includes a reflective film formed on the light transmission member. The light source device according to claim 1 or 2,
The light-shielding film has a light-absorbing film formed on the light source casing. The light source device according to any one of claims 1 to 3,
A light modulation device for modulating a light beam emitted from the light source device;
A projection lens that projects a light beam modulated by the light modulator;
A projector comprising:

Images