JP2004281215A - Light source device and projection display device using the same - Google Patents

Abstract

The present invention relates to a display of a projection type display device, in which a boundary between an output light from an output side opening surface of a through hole of a cylindrical light guide member and an output light from an output side end surface of a peripheral wall is inconspicuous. Make it incident.
A light source includes a transparent peripheral wall and a through-hole surrounded by the peripheral wall, one end of which is an incident end, and the other end is an emission end. Is formed of a cylindrical body which is formed so as to be shifted from the extension of the emission side opening surface 16b of the through hole 16, and reflects the light incident into the through hole 16 from the incident end on the inner peripheral surface of the peripheral wall 15. While being guided through the through hole 16, the light exits from the emission side opening surface 16 b and enters the peripheral wall 15 from the incident end, the light is guided inside the peripheral wall 15 while being reflected by the inner peripheral surface and the outer peripheral surface of the peripheral wall 15. The light guide member 14 that emits light from the emission side end face 15b is arranged.
[Selection] Fig. 2

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a light source device and a projection display device using the same.
[0002]
[Prior art]
The light source device used for the projection display device and the like, in order to emit light with a uniform intensity distribution, on the emission side of the light source unit that emits light, makes the emission light from the light source unit incident from the incident end, A light guide member that guides the light while reflecting the light inside and emits the light from the emission end is disposed (see Patent Document 1).
[0003]
This type of light source device includes a light source device with a solid rod-shaped light guide member and a light source device with a hollow cylindrical light guide member, but the cylindrical light guide member is lighter, Moreover, it is inexpensive.
[0004]
FIG. 7 is a side view of a conventional light source device provided with a cylindrical light guide member. The light source unit 1 has a light source lamp 2 and an emission port 3a at one end, and the light source lamp housed therein. And a reflector 3 that reflects the emitted light from the light source 2 in a direction in which the emitted light is condensed in front of the emission port 3a and emits the light from the emission port 3a.
[0005]
The light guide member 4 has a transparent peripheral wall 5 and a through-hole 6 surrounded by the peripheral wall 5, and is formed of a rectangular cylindrical body having one end as an incident end and the other end as an exit end. The incident end face 5a and the emission end face 5b of the peripheral wall 5 are respectively formed on surfaces perpendicular to the axis of the light guide member 4 (the axis of the cylindrical body).
[0006]
That is, the incident-side end face 5a of the peripheral wall 5 of the light guide member 4 is formed flush with the incident-side opening face 6a of the through-hole 6, and the exit-side end face 5b of the peripheral wall 5 is It is formed flush with the side opening surface 6b.
[0007]
The light guide member 4 is disposed with its incident end facing the light source unit 1, and transmits light incident into the through hole 6 from the incident end as shown by a solid line in FIG. Light guided through the through-hole 6 while being totally reflected at the interface between the inner peripheral surface and the air layer in the through-hole 6, emitted from the emission-side opening surface 6 b, and entered into the peripheral wall 5 from the incident end is shown in FIG. As shown by a broken line in FIG. 5, the light is guided inside the peripheral wall 5 while being totally reflected at the interface between the inner peripheral surface and the outer peripheral surface of the peripheral wall 5 and the inside of the through hole 6 and the external air layer, and is emitted from the emission side end face 5b. I do.
[0008]
The light source device is, for example, a projection type including a display body that displays an image by controlling reflection or transmission of light, such as a micromirror display device (Digital Micromirror Device) or a liquid crystal display device, which is generally abbreviated as DMD. Although not shown, the projection type display device is used in a display device, and a light source device, a light source side optical system that causes light emitted from the light source device to enter the display, and light emitted from the display. And a projection optical system that projects the image on a projection surface such as a screen.
[0009]
[Patent Document 1]
JP 9-160034 A
[0010]
[Problems to be solved by the invention]
By the way, the light source side optical system of the projection type display device is designed so that the light emitted from the light guide member 4 of the light source device is focused on and incident on the display body. Is designed to focus and project the outgoing light on the projection surface.
[0011]
On the other hand, in the light source device shown in FIG. 7, the cylindrical light guide member 4 guides the light incident into the through-hole 6 out of the light incident from the incident end to the light exit The light exiting from the opening surface 6b and entering the peripheral wall 5 is guided through the peripheral wall 5 and exits from the exit side end surface 5b, so that the light exiting from the exit end of the light guide member 4 is transmitted through the through hole 6b. Of the rectangular plane light A1 emitted from the emission-side opening surface 6b is light surrounded by a rectangular frame-shaped light A2 emitted from the emission-side end surface 5b of the peripheral wall 5.
[0012]
In the conventional light source device, the emission-side end surface 5b of the peripheral wall 5 of the light guide member 4 and the emission-side opening surface 6b of the through-hole 6 are flush with each other, and the light is emitted from the emission-side opening surface 6b of the through-hole 6. Both the light emitted and the light emitted from the emission side end face 5b of the peripheral wall 5 are focused on the display by the light source side optical system and enter the display, so that the light exits from the emission side opening 6b of the through hole 6. The boundary between the planar light A1 emitted and incident on the display body and the frame-shaped light A2 emitted from the emission side end face 5b of the peripheral wall 5 and incident on the display body is conspicuous.
[0013]
FIG. 8 is a schematic diagram showing the state of the light emitted from the conventional light source device incident on the display body. In FIG. 8, the light emitted from the emission side opening surface 6b of the through hole 6 of the light guide member 4 is displayed. 7 is hatched with solid lines, and the frame-shaped light A2 emitted from the emission side end face 5b of the peripheral wall 5 of the light guide member 4 and incident on the display 7 is hatched with broken lines.
[0014]
As described above, in the conventional light source device, the planar light A <b> 1 emitted from the emission side opening surface 6 b of the through hole 6 of the light guide member 4 and the emission side end surface 5 b of the peripheral wall 5 and incident on the display body 7 are formed by the frame. Since the boundary between the planar light A2 and the frame light A2 is conspicuous, when the boundary enters the display area 7a of the display body 7, the boundary between the planar light A1 and the frame light A2 is displayed on the display screen of the display body 7. Along the line pattern is visible.
[0015]
Therefore, the projection display device using the conventional light source device emits only the planar light A1 out of the light emitted from the light source device through the emission side opening surface 6b of the through hole 6 of the light guide member 4. It is designed to be incident on the display area 7a of the display 7 so that the display 7 displays a good image in which the line pattern is not visible on the display screen.
[0016]
However, since there is a certain error in the assembling accuracy of the projection display device, even if the position of the light from the light source device incident on the display body 7 is shifted due to the error, the through-hole of the light guide member 4 of the light source device. In order to ensure that only the planar light A1 emitted from the emission-side opening surface 6b of the display 6 enters the display area 7a of the display 7, as shown in FIG. The area 7a must be sufficiently smaller than the outer shape of the planar light A1 incident on the display body 7 in consideration of an error in the assembling accuracy of the projection display device. The projection type display device using the device cannot efficiently use the light emitted from the light source device for display on the display 7.
[0017]
According to the present invention, for example, a boundary between light emitted from an emission-side opening surface of a through-hole of a cylindrical light guide member and light emitted from an emission-side end surface of a peripheral wall is conspicuous with respect to a display body or the like of a projection display device. It is an object of the present invention to provide a light source device that can make incident light incident thereon and a projection display device that can efficiently use light from the light source device for display.
[0018]
[Means for Solving the Problems]
The light source device of the present invention has a light source unit that emits light, a transparent peripheral wall, and a through hole surrounded by the peripheral wall, one end of which is an incident end, and the other end is an emission end. An emission-side end surface is formed of a cylindrical body formed so as to be shifted from an extension surface of the emission-side opening surface of the through-hole, and the incident end is disposed so as to face the light source unit, and from the incident end to the inside of the through-hole. The incident light is guided through the through-hole while being reflected by the inner peripheral surface of the peripheral wall, exits from the opening surface of the through-hole, and the light incident on the peripheral wall from the incident end is incident on the inner peripheral surface and the outer periphery of the peripheral wall. A light guide member that guides the inside of the peripheral wall while reflecting on the surface, and emits the light from the end surface on the emission side.
[0019]
This light source device is used, for example, in a projection display device in which light emitted from a light source device is made incident on a display by a light source side optical system, and light emitted from the display is projected onto a projection surface by a projection optical system. The light source-side optical system of the projection display device is designed so that light emitted from the emission-side opening surface of the through-hole of the light guide member of the light source device is focused on the display body to be incident thereon. .
[0020]
Further, in the light source device according to the present invention, the light guide member is formed such that the emission side end surface of the peripheral wall of the light guide member is shifted from the extension surface of the emission side opening surface of the through hole surrounded by the peripheral wall. Out of the light that enters the display body through the light source-side optical system, the light emitted from the emission side opening surface of the through hole of the light guide member enters the display body as focused light. Light emitted from the end face on the emission side of the peripheral wall of the light guide member enters the display body as light that is out of focus, that is, light with a blurred outline.
[0021]
Therefore, according to this light source device, for example, with respect to the display body or the like of the projection type display device, the light emitted from the emission side opening surface of the through hole of the cylindrical light guide member and the emission light from the emission side end surface of the peripheral wall. Light whose boundary with the emitted light is inconspicuous can be incident.
[0022]
In the light source device of the present invention, the light source unit has a light source lamp and an emission port at one end, and reflects the light emitted from the light source lamp housed therein in a direction of condensing the light in front of the emission port. And a reflector that emits light from the emission port, and the light guide member is configured such that the incident side opening surface of the through-hole and the incident side end surface of the peripheral wall are in the cross section of the light beam that is collected and emitted from the light source unit. It is desirable to position and arrange.
[0023]
In this light source device, it is preferable that the incident side end surface of the peripheral wall of the light guide member is formed as an inclined surface inclined from the inner peripheral surface of the peripheral wall toward the outer peripheral surface toward the emission end.
[0024]
Further, it is preferable that the light guide member has an inner peripheral surface formed as a straight cylindrical surface and an outer peripheral surface formed as a tapered cylindrical surface that becomes wider from an emission end to an incidence end.
[0025]
A projection display device according to the present invention includes a light source device according to the present invention, a display body that displays an image by controlling reflection or transmission of light, and a light source side optic that causes light emitted from the light source device to enter the display body. And a projection optical system that projects light emitted from the display body onto a projection surface, wherein the light source-side optical system is configured to penetrate the light guide member among light emitted from the light guide member of the light source device. Since the light emitted from the opening surface on the emission side of the hole is designed to be focused and incident on the display body, the display area of the display body is changed to the emission side of the through hole of the light guide member. It is not necessary to make the light emitted from the opening surface smaller than the outer shape of the light incident on the display body. Therefore, the light from the light source device can be efficiently used for display.
[0026]
In the projection display device of the present invention, the display body has a display area having an area substantially equal to a region where light emitted from the emission side opening surface of the through hole of the light guide member of the light source device enters, Alternatively, it is larger than a region where the light emitted from the emission side opening surface of the through hole of the light guide member of the light guide member is incident, and is larger than an outer shape of a region where the light emitted from the emission side end surface of the peripheral wall of the light guide member is incident. Preferably has a display area with a small area.
[0027]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 4 show a first embodiment of the present invention. FIG. 1 is a configuration diagram of a projection display device, FIG. 2 is an enlarged side view of a light source device used in the projection display device, and FIG. FIG. 3 is a sectional view of a light guide member of the light source device.
[0028]
As shown in FIG. 1, the projection display device of this embodiment includes a light source device 10, a display body 17 for displaying an image by controlling the reflection or transmission of light, and a light source from the light source device 10. A light source side optical system 18 for entering the display 17 and a projection optical system 20 for projecting light emitted from the display 17 onto a projection surface are provided.
[0029]
The display 17 has, for example, a display area in which a plurality of micromirrors are arranged in a matrix in a row direction and a column direction, and is incident at a predetermined incident angle from an incident direction inclined in one direction with respect to the front direction. A micromirror display element for displaying an image by controlling the reflected direction of the light by switching the inclination direction of the plurality of micromirrors. Hereinafter, the display 17 is referred to as a micromirror display element.
[0030]
In this embodiment, in order to display a color image on the micromirror display element 17, the light emitted from the light source device 10 is applied to a plurality of colors, for example, red, green, and blue, on the emission side of the light source device 10. A color wheel 22 for sequentially coloring three colors is arranged.
[0031]
The color wheel 22 is composed of a disk-shaped rotating plate provided with fan-shaped red, green, and blue color filters arranged in the circumferential direction, and is driven to rotate by a motor 23.
[0032]
As shown in FIGS. 2 and 3, the light source device 10 is disposed on a light source unit 11 that emits light, and is disposed on an emission side of the light source unit 11, and emits light from the light source unit 11 from an incident end. The light guide member 14 guides the light while reflecting the light internally and emits the light from the emission end.
[0033]
The light source unit 11 of the light source device 10 has a light source lamp 12 and an emission port at one end, and reflects light emitted from the light source lamp 12 housed therein in a direction in which the light is collected in front of the emission port. And a reflector 13 emitted from the emission port.
[0034]
Further, the light guide member 14 has a transparent peripheral wall 15 formed by bonding side edges of four transparent plates made of glass or the like to each other, and a through hole 16 surrounded by the peripheral wall 15. One end is an incident end, and the other end is a rectangular cylindrical body having an emission end. The inner peripheral surface and the outer peripheral surface are formed as straight cylindrical surfaces parallel to each other.
[0035]
The incident side end face 15a of the peripheral wall 15 of the cylindrical light guide member 14 is formed on a plane perpendicular to the axis of the light guide member 14 (the axis of the cylindrical body), and the exit side end face 15b is formed of the peripheral wall 15b. 15 are formed on an inclined surface inclined from the inner peripheral surface toward the outer peripheral surface toward the incident end.
[0036]
That is, the incident side end surface 15a of the peripheral wall 15 of the light guide member 14 is formed flush with the incident side opening surface 16a of the through hole 16, and the exit side end surface 15b of the peripheral wall 15 is It is formed obliquely shifted from the extension surface of the side opening surface 16b.
[0037]
The light guide member 14 has its incident end opposed to the light source unit 11, and collects and emits the light from the light source unit 11 through the incident side opening surface 16 a of the through hole 16 and the incident side end surface 15 a of the peripheral wall 15. As shown by a solid line in FIG. 2, the light incident on the through hole 16 from the incident end is positioned inside the cross section of the light beam, and the air inside the through hole 16 and the inner peripheral surface of the peripheral wall 15. Light guided through the through-hole 16 while being totally reflected at the interface with the layer and emitted from the emission-side opening surface 16b, and incident on the peripheral wall 15 from the incident end, as shown by a broken line in FIG. The light is guided inside the peripheral wall 15 while being totally reflected at the interface between the inner peripheral surface and the outer peripheral surface of the peripheral wall 15 and the inside of the through hole 16 and the outer air layer, and is emitted from the exit side end surface 15b.
[0038]
In this embodiment, the light incident on the peripheral wall 15 from the incident end of the light guide member 14 is totally reflected at the interface between the inner and outer peripheral surfaces thereof and the through hole 16 and the external air layer. A light-reflecting film is provided on the outer peripheral surface of the light guide member 14, and the light incident on the peripheral wall 15 is reflected by the interface between the inner peripheral surface and the air layer in the through hole 16. The light may be guided while being reflected by the reflection film.
[0039]
The light source side optical system 18 emits light from the light guide member 14 of the light source device 10, corrects the light colored by the color wheel 22 disposed on the emission side to parallel light, and supplies the parallel light to the micromirror display element 17. The light source side optical system 18 is provided with a light source side lens 19 for making the light incident thereon. The light emitting side opening surface 16 b of the through hole 16 of the light guide member 14 is included in the light emitted from the light guide member 14 of the light source device 10. Is designed so that light emitted from the micromirror display element 17 is focused and incident on the micromirror display element 17.
[0040]
Further, the projection optical system 20 includes a projection lens 21 that projects outgoing light from the micromirror display element 17 while enlarging its light flux. Is designed to be focused and projected onto a projection surface such as a screen (not shown).
[0041]
Since this projection display device uses the light source device 10 having the above-described configuration, the light is emitted from the light guide member 14 of the light source device 10 and is transmitted to the micromirror display element 17 via the light source side optical system 18. The incident light is a light in which the boundary between the light emitted from the emission side end surface 15b of the peripheral wall 15 of the light guide member 14 and the light emitted from the emission side opening surface 16b of the through hole 16 surrounded by the peripheral wall 15 is inconspicuous. The light can be incident on the micromirror display element 17.
[0042]
That is, in the light source device 10, the cylindrical light guide member 14 guides the light incident into the through hole 16 out of the light incident from the incident end to the inside of the through hole 16 and outputs the light through the opening side surface 16b. The light emitted from the light guide member 14 is guided through the peripheral wall 15 and emitted from the emission side end face 15 b, so that the light emitted from the emission end of the light guide member 14 is emitted from the emission side of the through hole 16. The periphery of the rectangular surface light B1 emitted from the opening surface 16b is light surrounded by the rectangular frame-shaped light B2 emitted from the emission side end surface 15b of the peripheral wall 15.
[0043]
However, the light source device 10 is formed by shifting the emission side end surface 15b of the peripheral wall 15 of the light guide member 14 from the extension surface of the emission side opening surface 16b of the through hole 16 surrounded by the peripheral wall 15, The light source-side optical system 18 is configured to output, of the light emitted from the light guide member 14 of the light source device 10, light emitted from the emission side opening surface 16 b of the through hole 16 of the light guide member 14 to the micromirror display element 17. Since the light is designed to be focused on and incident on the micromirror display element 17 through the light source side optical system 18 and emitted from the light guide member 14 of the light source device 10, The planar light B1 emitted from the emission side opening surface 16b of the through hole 16 of the light guide member 14 is incident on the micromirror display element 17 as focused light, and the peripheral wall of the light guide member 14 is formed. Light frame-shaped light B2 emitted from the exit end face 15b of the 5 does not fit in focus on the micromirror display device 17, i.e. as a light contour is blurred.
[0044]
Therefore, according to the light source device 10, the emission light B 1 from the emission-side opening surface 16 b of the through hole 16 of the cylindrical light guide member 14 and the emission-side end surface of the peripheral wall 15 with respect to the micromirror display element 17. Light whose boundary with the output light B2 from 15b is inconspicuous can be incident.
[0045]
Further, in this embodiment, the light source unit 11 of the light source device 10 is provided with a light source lamp 12 and an emission port at one end, and radiated light from the light source lamp 12 housed therein is provided in front of the emission port. The light guide member 14 is formed by a reflector 13 that reflects light in the direction of light collection and exits from the exit port. The light guide member 14 is configured such that the entrance side opening surface 16a of the through hole 16 and the entrance side end surface 15a of the peripheral wall 15 are the light source unit. Since it is located and arranged in the cross section of the light flux condensed and emitted from 11, the light emitted from the light source unit 11 is made to enter into the through hole 16 and the peripheral wall 15 of the light guide member 14, The light can be emitted from the emission side opening face 16b of the through hole 16 and the emission side end face 15b of the peripheral wall 15.
[0046]
In the projection display device, light emitted from the light guide member 14 of the light source device 10 and incident on the micromirror display element 17 is emitted from the through hole 16 of the light guide member 14 as described above. Since the boundary between the output light B1 from the opening surface 16b and the output light B2 from the output side end surface 15b of the peripheral wall 15 is inconspicuous, the display area of the micromirror display element 17 extends through the light guide member 14. There is no need to make the outer shape of the planar light B1 emitted from the emission-side opening surface 16b of the hole 16 and incident on the micromirror display element 17 smaller. Therefore, the light from the light source device 10 is efficiently used for display. be able to.
[0047]
In this projection display device, the micromirror display element 17 is substantially equal to a region where the planar light B1 emitted from the emission side opening surface 16b of the through hole 16 of the light guide member 14 of the light source device 10 is incident. The light guide member 14 of the light source member 14 of the light source device 10 is larger than a region where the planar light B1 emitted from the emission side opening surface 16b of the through hole 16 of the light guide member 14 is incident. It is preferable to have a display area having an area smaller than the outer shape of the area where the frame-shaped light B2 emitted from the emission side end face 15b of the peripheral wall 15 is incident.
[0048]
FIG. 4 is a schematic diagram showing the state of the light emitted from the light source device 10 incident on the micromirror display element 17. In the figure, the light is emitted from the emission side opening surface 16 b of the through hole 16 of the light guide member 14. The solid light B1 incident on the micromirror display element 17 is subjected to solid line hatching, and the frame light B2 emitted from the exit side end face 15b of the peripheral wall 15 of the light guide member 14 and incident on the micromirror display element 17 is applied. Are hatched with broken lines.
[0049]
4A, the area of the display area 17a of the micromirror display element 17 is substantially equal to the area where the planar light B1 emitted from the emission side opening surface 16b of the through hole 16 of the light guide member 14 is incident. (B) is a plane light emitted from the emission side opening surface 16b of the through hole 16 of the light guide member 14 with the area of the display area 17a of the micromirror display element 17 shown. The figure shows an incident state when the area is larger than the area where B1 is incident and smaller than the outer shape of the area where the frame light B2 emitted from the exit side end face 15b of the peripheral wall 15 of the light guide member 14 is incident.
[0050]
4 (a) and 4 (b) show the case where the incident position of the light from the light source device 10 on the micromirror display element 17 is shifted obliquely to the upper left in the figure due to an assembly error of the projection display device. The state is shown.
[0051]
First, the light source when the area of the display area 17a of the micromirror display element 17 is substantially equal to the area where the planar light B1 emitted from the emission side opening surface 16b of the through hole 16 of the light guide member 14 is incident. The state of incidence of light from the device 10 will be described. In this case, as shown in FIG. 4A, the through hole 16 of the light guide member 14 covers almost the entire display area 17a of the micromirror display element 17. Since the planar light B1 emitted from the emission side opening surface 16b enters, most of the planar light B1 emitted from the emission side opening surface 16b of the through hole 16 of the light guide member 14 can be efficiently used for display. it can.
[0052]
The planar light B1 emitted from the emission side opening surface 16b of the through hole 16 of the light guide member 14 enters the micromirror display element 17 as in-focus light as described above. An image of good quality can be displayed on the display element 17 over substantially the entire display area 17a, and the image can be projected onto a projection surface by the projection optical system 20.
[0053]
In this case, if the incident position of the light from the light source device 10 on the micromirror display element 17 shifts due to the assembly error of the projection display device as described above, the shift direction of the light incident position in the display area 17a is determined. The unfocused frame light B2 emitted from the emission side end face 15b of the peripheral wall 15 of the light guide member 14 is incident on the opposite edge, and the display of that area is blurred. There is no visible line pattern along the boundary between the planar light B1 and the frame light B2 on the screen, and the width of the area where the frame light B2 is incident is extremely small, so that the focus adjustment is performed. There is almost no influence on the display quality of the micromirror display element 17 due to the incidence of the non-frame light B2.
[0054]
Next, the area of the display area 17a of the micromirror display element 17 is larger than the area where the planar light B1 emitted from the emission side opening surface 16b of the through hole 16 of the light guide member 14 is incident. The incident state of light from the light source device 10 when the outer shape of the region where the frame-shaped light B2 emitted from the emission-side end face 15b of the peripheral wall 15 is incident will be described. In this case, FIG. As described above, the planar light B1 emitted from the emission-side opening surface 16b of the through hole 16 of the light guide member 14 is incident on a region excluding the peripheral portion in the display area 17a of the micromirror display element 17, and the display is performed. Since part of the frame-shaped light B2 (light other than light incident outside the display area) emitted from the emission end face 15b of the peripheral wall 15 of the light guide member 14 is incident on the peripheral portion in the area 17a, the light source Apparatus 10 Can be utilized et of light more efficiently displayed.
[0055]
The planar light B1 incident on a region excluding the peripheral edge in the display area 17a of the micromirror display element 17 is focused light, and the frame-shaped light incident on the peripheral edge in the display area 17a is in focus. Since the light B2 is out of focus, when the light B2 and the light B2 are incident on the display area 17a of the micromirror display element 17, the display screen of the display area 17a is blurred at its peripheral edge. Display.
[0056]
However, also at this time, a line pattern along the boundary between the planar light B1 and the frame light B2 is not seen in the display screen, and the display blur at the periphery of the display screen is not so noticeable. The image of sufficient quality can be displayed on the micromirror display element 17, and the image can be projected on the projection surface by the projection optical system 20.
[0057]
FIG. 5 is a side view of a light source device showing a second embodiment of the present invention, and FIG. 6 is a side view of a light source device showing a third embodiment of the present invention. 5 and 6, the same components as those of the light source device 10 of the first embodiment described above are denoted by the same reference numerals in the drawings, and description thereof will be omitted.
[0058]
The light source device 10a according to the second embodiment shown in FIG. 5 has a light-emitting side end face 15b of a peripheral wall 15 of a cylindrical light guide member 14 having an inner peripheral surface and an outer peripheral surface formed as straight cylindrical surfaces parallel to each other. Similarly to the light source device 10 of the first embodiment, the light guide member 14 is formed so as to be obliquely shifted from the extension surface of the emission side opening surface 16b of the through hole 16 and the incident side end surface 15a of the peripheral wall 15 of the light guide member 14 is connected to the peripheral wall. 15 is formed on an inclined surface inclined from the inner peripheral surface toward the outer peripheral surface toward the emission end.
[0059]
According to the light source device 10a, of the light condensed from the light source unit 11 and emitted, the amount of light incident on the peripheral wall 15 of the light guide member 14 is increased, and the light from the exit side end face 15b of the peripheral wall 15 is increased. The intensity of the emitted light B2 can be increased.
[0060]
That is, the cylindrical light guide member 14 guides the light incident into the through hole 16 from the incident end thereof through the through hole 16 while reflecting the light on the inner peripheral surface of the peripheral wall 15, and guides the light from the exit side opening surface 16 b. The emitted light is guided into the peripheral wall 15 while being reflected by the inner peripheral surface and the outer peripheral surface of the peripheral wall 15 from the incident end into the peripheral wall 15, and is emitted from the exit side end surface 15 b. The light incident inside the through hole 16 (in the air layer) is guided with almost no attenuation and exits from the exit side opening surface 16b, whereas the light incident into the peripheral wall 15 is The light is attenuated to some extent in the process of being guided through the peripheral wall 15 and exits from the exit side opening surface 16b.
[0061]
However, in the light source device 10a of this embodiment, the incident side end surface 15a of the peripheral wall 15 of the light guide member 14 is formed as a slope inclined from the inner peripheral surface of the peripheral wall 15 toward the outer peripheral surface toward the emission end. Therefore, the amount of light incident on the peripheral wall 15 of the light guide member 14 can be made larger than that of the light source device 10 of the first embodiment described above. The light B2 emitted from the emission-side opening surface 16b of the through hole 16 has almost the same intensity as the light B1 and is emitted to the micromirror display element 17 of the projection display device shown in FIG. Light in which the boundary between the outgoing light B1 from the outgoing-side opening surface 16b and the outgoing light B2 from the outgoing-side end surface 15b of the peripheral wall 15 can be made more invisible.
[0062]
Further, in the light source device 10b of the third embodiment shown in FIG. 6, the light exit side end face 15b of the peripheral wall 15 of the light guide member 14 is made to emit light from the through hole 16 in the same manner as the light source device 10 of the first embodiment. The taper is formed so as to be obliquely shifted from the extension surface of the side opening surface 16b, the inner peripheral surface of the peripheral wall 15 is formed as a straight cylindrical surface, and the outer peripheral surface of the peripheral wall 15 becomes wider from the emission end side to the incidence end side. The area on the incident side end face 15a of the peripheral wall 15 is increased by being formed on the cylindrical surface.
[0063]
According to the light source device 10a, similarly to the second embodiment, of the light condensed from the light source unit 11 and emitted, the amount of light incident on the peripheral wall 15 of the light guide member 14 is increased, Since the intensity of the light B2 emitted from the emission side end face 15b of the peripheral wall 15 can be increased, the light B1 emitted from the emission side opening surface 16b of the through hole 16 and the peripheral wall 15 The light with which the boundary with the outgoing light B2 from the outgoing side end face 15b of 15 is less noticeable can be made to enter.
[0064]
In this embodiment, as shown in FIG. 6, the incident side end face 15a of the peripheral wall 15 of the light guide member 14 is formed flush with the incident side opening face 16a of the through hole 16. The member 14 forms the inner peripheral surface of the peripheral wall 15 as a straight cylindrical surface as described above, and forms the outer peripheral surface of the peripheral wall 15 as a tapered cylindrical surface that becomes thicker from the emission end side toward the incident end side. As in the second embodiment, the incident side end face 15a may be formed as a slope inclined from the inner peripheral face toward the outer peripheral face toward the emission end.
[0065]
In the light source devices 10, 10 a, and 10 b of the first to third embodiments, the exit side end surface 15 b of the peripheral wall 15 of the light guide member 14 is directed from the inner peripheral surface of the peripheral wall 15 to the outer peripheral surface. However, if the emission-side end surface 15b of the peripheral wall 15 is shifted from the extension surface of the emission-side opening surface 16b of the through hole 16, the inner peripheral surface of the peripheral wall 15 will be inward. It may be an inclined surface inclined toward the incident end toward the peripheral surface, a curved surface, a stepped surface, or the like.
[0066]
Further, the projection type display device shown in FIG. 1 uses the micromirror display element 17 as a display body. In the present invention, a reflection type liquid crystal display element having a reflection film on the back side is used as a display body. A projection type display device, a transmission type liquid crystal display element for controlling transmission of light and displaying an image as a display body, and a light source side optical system for making light from the light source device incident on the display body on an incident side thereof. The present invention can also be applied to a projection type display device in which a projection optical system is arranged on the emission side of the display body.
[0067]
In the case of a projection display device using a liquid crystal display element as a display, the liquid crystal display element may be a color image display element having a plurality of color filters, for example, three color filters of red, green, and blue. In this case, the color wheel 22 disposed on the emission side of the light source device 10 in the projection display device shown in FIG. 1 is unnecessary.
[0068]
Further, the light source device of the present invention can be used not only for a projection display device having a display body for displaying an image by controlling the reflection or transmission of light but also for other optical devices.
[0069]
【The invention's effect】
The light source device of the present invention has a light source unit that emits light, a transparent peripheral wall, and a through hole surrounded by the peripheral wall, one end of which is an incident end, and the other end is an emission end. An emission-side end surface is formed of a cylindrical body formed so as to be shifted from an extension surface of the emission-side opening surface of the through-hole, and the incident end is disposed so as to face the light source unit, and from the incident end to the inside of the through-hole. The incident light is guided through the through-hole while being reflected by the inner peripheral surface of the peripheral wall, exits from the opening surface of the through-hole, and the light incident on the peripheral wall from the incident end is incident on the inner peripheral surface and the outer periphery of the peripheral wall. And a light guide member that guides the inside of the peripheral wall while reflecting on the surface and emits the light from the end surface on the emission side. Outgoing light from the outgoing opening of the through hole and outgoing from the outgoing end of the peripheral wall Can be incident light boundary is inconspicuous with.
[0070]
In the light source device of the present invention, the light source unit has a light source lamp and an emission port at one end, and reflects the light emitted from the light source lamp housed therein in a direction of condensing the light in front of the emission port. And a reflector that emits light from the emission port, and the light guide member is configured such that the incident side opening surface of the through-hole and the incident side end surface of the peripheral wall are in the cross section of the light beam that is collected and emitted from the light source unit. It is preferable that the light source unit emits light from the light source unit into the through hole and the peripheral wall of the light guide member, and the light is emitted from the emission side opening of the through hole. The light can be emitted from the surface and the end face on the emission side of the peripheral wall.
[0071]
In this light source device, the incident side end surface of the peripheral wall of the light guide member is preferably formed as a slope inclined toward the emission end from the inner peripheral surface of the peripheral wall toward the outer peripheral surface. By increasing the amount of light incident on the peripheral wall of the light guide member to increase the intensity of light emitted from the exit side end surface of the peripheral wall, the display body, etc., from the exit side opening surface of the through hole. Light in which the boundary between the outgoing light and the outgoing light from the outgoing end surface of the peripheral wall is less noticeable can be made to enter.
[0072]
In addition, the light guide member is preferably formed such that the inner peripheral surface of the peripheral wall is formed as a straight cylindrical surface, and the outer peripheral surface of the peripheral wall is formed as a tapered cylindrical surface that becomes wider from the emission end side toward the incident end side. By doing so, the amount of light incident on the peripheral wall of the light guide member is increased to increase the intensity of light emitted from the exit side end face of the peripheral wall, and the emission of the through hole to the display body or the like is performed. Light in which the boundary between the light emitted from the side opening surface and the light emitted from the emission side end surface of the peripheral wall is less noticeable can be made to enter.
[0073]
A projection display device according to the present invention includes a light source device according to the present invention, a display body that displays an image by controlling reflection or transmission of light, and a light source side optic that causes light emitted from the light source device to enter the display body. And a projection optical system that projects light emitted from the display body onto a projection surface, wherein the light source-side optical system is configured to penetrate the light guide member among light emitted from the light guide member of the light source device. It is characterized in that it is designed so that light emitted from the emission-side opening surface of the hole is focused and incident on the display body.
[0074]
According to this projection display device, the light emitted from the light guide member of the light source device and incident on the display body is, as described above, the light emitted from the emission side opening surface of the through hole of the light guide member. Since the boundary between the light emitted from the end face of the peripheral wall and the light emitted from the end face is inconspicuous, the light that exits the display area of the display from the opening face of the through hole of the light guide member and enters the display. It is not necessary to make it smaller than the outer shape of the light source device. Therefore, light from the light source device can be efficiently used for display.
[0075]
In the projection display device according to the aspect of the invention, the display body has a display area having an area substantially equal to a region where light emitted from an emission side opening surface of the through hole of the light guide member of the light source device is incident. In this way, most of the light emitted from the emission-side opening surface of the through-hole of the light guide member can be efficiently used for display, and the display area of the display body is An image of good quality can be displayed over substantially the entire area, and the image can be projected on a projection surface by the projection optical system.
[0076]
Further, the display body is larger than a region where the light emitted from the emission side opening surface of the through hole of the light guide member of the light source device is incident, and the light emitted from the emission side end surface of the peripheral wall of the light guide member is incident thereon. A display area having an area smaller than the outer shape of the region to be displayed may be used. With this configuration, light from the light source device can be more efficiently used for display.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a projection display device showing a first embodiment of the present invention.
FIG. 2 is an enlarged side view of a light source device used in the projection display device of the first embodiment.
FIG. 3 is a sectional view of a light guide member of the light source device.
FIG. 4 is a schematic diagram showing a state where light emitted from the light source device is incident on a display body.
FIG. 5 is a side view of a light source device according to a second embodiment of the present invention.
FIG. 6 is a side view of a light source device showing a third embodiment of the present invention.
FIG. 7 is a side view of a conventional light source device provided with a cylindrical light guide member.
FIG. 8 is a schematic diagram showing a state where light emitted from a conventional light source device enters a display body.
[Explanation of symbols]
Reference numerals 10, 10a, 10b: light source device, 11: light source unit, 12: light source lamp, 13: reflector, 14: light guide member, 15: peripheral wall, 15a: incident end face, 15b: emission end face, 16: through hole, 16a: entrance side aperture, 16b: exit side aperture, 17: micromirror display element (display), 18: light source side optical system, 20: projection optical system, 22: color wheel.

Claims (7)

A light source unit that emits light, a transparent peripheral wall, and a through-hole surrounded by the peripheral wall, one end being an incident end, the other end being an emission end, and an exit end surface of the peripheral wall being the penetration end; A cylindrical body which is formed so as to be shifted from an extension surface of the emission side opening surface of the hole, is disposed so that the incident end faces the light source unit, and transmits light incident into the through hole from the incident end to the peripheral wall. The peripheral wall reflects the inner peripheral surface, guides the inside of the through hole, emits light from the exit side opening surface, and reflects light incident on the peripheral wall from the incident end on the inner peripheral surface and the outer peripheral surface of the peripheral wall. A light guide member that guides the inside and emits light from the end surface on the emission side. The light source unit has a light source lamp and an emission port at one end, and a reflector that reflects emitted light from the light source lamp housed therein in a direction of condensing the light in front of the emission port and emits the light from the emission port. The light guide member is arranged such that the incident side opening surface of the through hole and the incident side end surface of the peripheral wall are positioned within the cross section of the light beam condensed and emitted from the light source unit. The light source device according to claim 1, wherein: The light source device according to claim 2, wherein an incident-side end surface of the peripheral wall of the light guide member is formed as an inclined surface that is inclined in a direction of an emission end from an inner peripheral surface of the peripheral wall toward an outer peripheral surface. The inner peripheral surface of the peripheral wall of the light guide member is formed as a straight cylindrical surface, and the outer peripheral surface of the peripheral wall is formed as a tapered cylindrical surface that becomes thicker from the emission end side to the incidence end side. Or the light source device according to 3. 2. The light source device according to claim 1, a display body that controls reflection or transmission of light to display an image, a light source side optical system that causes light emitted from the light source device to enter the display body, and the display body. A projection optical system for projecting light emitted from the light source onto a projection surface, wherein the light source-side optical system includes an emission-side opening surface of a through-hole of the light guide member among light emitted from the light guide member of the light source device. A projection-type display device, which is designed so that light emitted from the device is focused and incident on the display body. 6. The display body according to claim 5, wherein the display body has a display area having an area substantially equal to a region on which light emitted from the emission side opening surface of the through hole of the light guide member of the light source device is incident. Projection display device. The display body is larger than a region where light emitted from the emission side opening surface of the through hole of the light guide member of the light source device is incident, and an outer shape of a region where light emitted from the emission side end surface of the peripheral wall of the light guide member is incident. The projection type display device according to claim 5, wherein the projection type display device has a display area having a smaller area.

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