JP2009058726A - Light source device and display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To exactly align an optical axis of a light source with an optical axis of the post-stage even after the light source is attached to base material. <P>SOLUTION: A light source device 101 includes: the light sources 101R, 101G and 101B; cooling fins 1,011 attached to the light sources 101R, 101G and 101B; the base material 1,010 performing positioning in the optical axis direction of the light sources 101R, 101G and 101B; a pressing plate 1,020 holding and fixing the cooling fin 1,011 between the base material 1,010 and the pressing plate 1,020; a first eccentric cam whose rotary shaft is inserted in the base material 1,010 and whose cam abuts on the end of the cooling fin 1,011 so as to adjust the position in the direction of a first axis out of two axes orthogonal to the optical axis of the light source; and a second eccentric cam whose rotary shaft is inserted in the cooling fin 1,011 and whose cam abuts on the end of the pressing plate 1,020 so as to adjust the position in the direction of a second axis out of two axes orthogonal to the optical axis of the light source. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a light source device in which a cooling unit is attached to a light source, and a display device that generates projection images by irradiating light onto a display element using the light source device.

  Projection-type display devices such as liquid crystal projectors split light emitted from a light source into three primary colors of R (red), G (green), and B (blue), and display elements (liquid crystals) corresponding to each color through a predetermined path. Panel, etc.), modulation, synthesis by a synthesis prism, and then enlarged projection on a screen via a projection optical system (see, for example, Patent Document 1).

  Here, a light source device that makes light incident on the display element is provided with a light source that serves as a light emission source, and this light source is provided with cooling means such as cooling fins for suppressing heat generation.

JP 10-133303 A

  Here, since the light source to which the cooling means is attached increases in weight, it is difficult to accurately align the light source with the base material in order to align the optical axis of the light source with the optical axis of the projection lens. In particular, in a light source device including a plurality of monochromatic light sources such as LEDs and lasers corresponding to RGB, it is necessary to accurately attach each color light source to the substrate, and after attaching the light source to the substrate from the positional relationship with the projection lens It is necessary to adjust the position of each light source independently. Such position adjustment is very difficult.

  Therefore, an object of the present invention is to provide a light source device and a display device that can accurately adjust the position by a simple mechanism even after the light source is attached to a substrate.

  The present invention has been made to achieve the above object. That is, the present invention includes a light source, a cooling means attached to the light source, a base material that positions the light source along the optical axis direction, a pressing plate that sandwiches and fixes the cooling means between the base material, A first eccentric cam in which a rotating shaft is inserted into the base material and a cam abuts against an end of the cooling means in order to adjust the position along the direction of the first axis out of the two axes orthogonal to the optical axis of the light source; In order to adjust the position along the direction of the second axis orthogonal to the first axis among the two axes orthogonal to the optical axis of the light source, a rotating shaft is inserted into the cooling means, and a cam is provided at the end of the holding plate. It is a light source device provided with the 2nd eccentric cam which contact | abuts.

  In such this invention, positioning along an optical axis direction is performed by attaching a light source to a base material. Further, since the cooling means is sandwiched between the light source and the base material by the pressing plate, the direction along the two axes orthogonal to the optical axis is adjusted on the base material by the first eccentric cam and the second eccentric cam. You can finely move along.

  The present invention also includes a light source device, an optical unit that divides the light emitted from the light source device into a plurality of colors, guides the light to a display element corresponding to each color, and synthesizes the light modulated by each display element, In a display device including a projection optical system that projects light synthesized by an optical unit, a light source device includes a light source, a cooling unit attached to the light source, and a base material that positions the light source along the optical axis direction. A rotating shaft is inserted into the base material in order to adjust the position along the direction of the first axis out of the two axes perpendicular to the optical axis of the light source, and a holding plate that holds the cooling means between the base material and fixes it. The first eccentric cam with which the cam contacts the end of the cooling means and the position along the direction of the second axis orthogonal to the first axis among the two axes orthogonal to the optical axis of the light source are adjusted. Therefore, the rotating shaft is inserted into the cooling means and the cam contacts the end of the holding plate A display device and a second eccentric cam.

  In such this invention, the positioning along an optical axis direction is performed because the light source in a light source device is attached to a base material. Further, since the cooling means is sandwiched between the light source and the base material by the pressing plate, the direction along the two axes orthogonal to the optical axis is adjusted on the base material by the first eccentric cam and the second eccentric cam. You can finely move along.

  Therefore, according to the present invention, the light source can be finely adjusted along the direction of two axes perpendicular to the optical axis in a state where the light source is attached to the base material, and even after the light source with the cooling means is attached to the base material. It becomes possible to accurately align the optical axis of the light source with the optical axis of the subsequent stage.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Display device: Rear projector)
FIG. 1 is a schematic diagram illustrating a rear projector that is an example of a display device to which the light source device of the present embodiment is applied. This rear projector is configured to include a liquid crystal projector 1000, a reflection mirror 1001, and a screen S arranged in a housing.

  The liquid crystal projector 1000, which is a main part of the rear projector, includes an optical unit 1000U in which a display element (liquid crystal panel: liquid crystal display device) is attached around the prism block, and the light emitted from the light source device is transmitted to the optical unit 1000U. Is modulated into an image, projected, reflected by the reflection mirror 1001, and projected from the back surface of the screen S.

  In the present embodiment, in the light source device provided with the light source provided in the liquid crystal projector 1000, the optical axis can be accurately aligned in a state where a plurality of single color light sources corresponding to each color of RGB are attached to the base material. .

(Display device: LCD projector)
FIG. 2 is a schematic diagram illustrating the configuration of a liquid crystal projector to which the light source device according to the present embodiment is applied. The liquid crystal projector 1000 is mainly applied to the rear projector shown in FIG. 1, but can also be applied to other devices such as a front projector.

  That is, the liquid crystal projector 1000 includes a light source device 101, a lens unit 102, a dichroic color separation filter 103, beam splitters 104r, 104g, and 104b, liquid crystal display devices 1r, 1g, and 1b, optical compensation plates 10r, 10g, and 10b, and a drive circuit 105r. , 105g, 105b, a prism (dichroic mirror) 106, and a projection lens 107.

  In this system, light emitted from the light source device 101 is sent from the lens unit 102 to the dichroic color separation filter 103, where it is separated in two directions. The light separated in two directions corresponds to three colors R (RED), G (GREEN), and B (BLUE) by total reflection mirrors 108 and 109, beam splitters 104r, 104g, and 104b, dichroic mirror 110, and prism 106. Each of them is sent to a display unit composed of a reflective liquid crystal display device 1r, 1g, 1b.

  For example, light from the light source device 101 enters the liquid crystal display device 1r corresponding to R (RED) from the dichroic color separation filter 103 via the total reflection mirror 108, the beam splitter 104r, and the optical compensation plate 10r, and G ( GREEN) liquid crystal display device 1g receives light from light source device 101 from dichroic color separation filter 103 via total reflection mirror 108, dichroic mirror 110 and beam splitter 104g, and optical compensator 10g, and B ( The light from the light source device 101 enters the liquid crystal display device 1b corresponding to (BLUE) from the dichroic color separation filter 103 via the total reflection mirror 109, the beam splitter 104b, and the optical compensation plate 10b.

  Each of the liquid crystal display devices 1r, 1g, and 1b is provided via beam splitters 104r, 104g, and 104b in a state corresponding to the plurality of surfaces of the prism 106 that is a dichroic mirror. Each of the liquid crystal display devices 1r, 1g, and 1b is driven by the corresponding drive circuits 105r, 105g, and 105b, reflects the incident light as an image on the liquid crystal layer, synthesizes it by the prism 106, and sends it to the projection lens 107. . As a result, an image corresponding to three colors R (RED), G (GREEN), and B (BLUE) is projected onto a screen (not shown) and reproduced as a color image.

  The liquid crystal projector shown in FIG. 2 is a reflective liquid crystal projector that reflects and modulates the light emitted from the light source device 101 by the liquid crystal display devices 1r, 1g, and 1b. The present invention can also be applied to a transmissive liquid crystal projector that transmits and modulates light at 1g and 1b.

(Optical unit)
The optical unit 1000U according to the present embodiment includes, for example, a lens unit 102 including a fly-eye lens 110, a dichroic color separation filter 103, total reflection mirrors 108 and 109, and a dichroic mirror in the configuration of the liquid crystal projector 1000 illustrated in FIG. 110, optical compensation plates 10r, 10g, and 10b, display devices (liquid crystal display devices 1r, 1g, and 1b), and beam splitters 104r, 104g, and 104b corresponding to the display devices. It should be noted that other combinations are possible as the optical unit 1000U.

(Light source device)
FIG. 3 is a schematic perspective view illustrating the light source device according to the present embodiment. The light source device 101 is connected to the rear of the optical unit 1000U, and can project light from the projection lens 107 disposed in front of the optical unit 1000U by irradiating light toward the optical unit 1000U. .

  The light source device 101 applied in this embodiment has a configuration in which separate light sources 101R, 101G, and 101B are attached to a base material 1010 corresponding to the three primary colors R (red), G (green), and B (blue). It has become. As the light sources 101R, 101G, and 101B, LEDs and lasers are used.

  When LEDs or lasers are used as the light sources 101R, 101G, and 101B, a cooling means such as a cooling fin 1011 is attached to the light sources 101R, 101G, and 101B, particularly in the high output type. In this embodiment, the cooling fin 1011 is attached to the back surface of the LED or laser element so that heat can be radiated therefrom.

  Each of the light sources 101R, 101G, and 101B is attached to the base material 1010 through cooling fins 1011. That is, a flange portion provided in advance on the cooling fin 1011 is sandwiched between the base material 1010 and the holding plate 1020, the cooling fin 1011 is brought into contact with the reference surface of the base material 1010, and positioning along the optical axis direction is performed. And fixing.

  In the present embodiment, for each of the three light sources 101R, 101G, and 101B, the left and right ends of the cooling fin 1011 are fixed to the base material 1010 by the two pressing plates 1020. Specifically, the light source 101R and the light source 101G are fixed together by two left and right pressing plates 1020, and the light source 101B is fixed by two left and right pressing plates 1020.

  FIG. 4 is a schematic perspective view of the light source device, and FIG. 5 is a schematic side view of the light source device. The three light sources 101R, 101G, and 101B are arranged in a vertically arranged state in the drawing, and are attached to the reference surface of the base material 1010 by the press plate 1020 described above. The holding plate 1020 is fastened to the base material 1010 side by bolts, and the flange portions of the cooling fins 1011 of the light sources 101R, 101G, and 101B are sandwiched between the base material 1010 and the holding plate 1020 by this fastening. As a result, the light sources 101R, 101G, and 101B are fixed to the base material 1010. Therefore, the fixing strength of the light sources 101R, 101G, and 101B can be set by the tightening degree of the bolt that fixes the pressing plate 1020.

  FIG. 6 is a schematic rear view of the light source device. The back surface of the base material 1010 has a frame shape, and the light sources 101R, 101G, and 101B are arranged in the frame to emit light to the front side. The frame portion on the back surface of the base material serves as a reference surface. By attaching the cooling fins 1011 of the light sources 101R, 101G, and 101B to the reference surface, the light sources 101R, 101G, and 101B are positioned along the optical axis direction. Is going.

  In order to fix the light sources 101R, 101G, and 101B to the base material 1010, the light sources 101R, 101G, and 101B to which the cooling fins 1011 are attached are arranged at predetermined positions within the frame of the base material 1010, and the flange portions of the cooling fins 1011 are attached. It contacts the reference surface of the frame portion of the base material 1010. In this state, the flange portion of the cooling fin 1011 is pressed by the pressing plate 1020, and the pressing plate 1020 is fixed to the base material 1010 by the bolt B. Accordingly, the flange portion of the cooling fin 1011 can be sandwiched and fixed between the pressing plate 1020 and the base material 1010.

  In the present embodiment, the R light source 101R and the G light source 101G are fixed by a pair of left and right pressing plates 1020, and the B light source 101B is fixed by a pair of left and right pressing plates 1020. Fig.7 (a) is the sectional view on the aa line of FIG. The bolt B penetrates the holding plate 1020 and is screwed with a base material 1010. As a result, the cooling fin 1011 can be fixed to the base material 1010 via the pressing plate 1020 by tightening the bolt B.

  In the present embodiment, the base 1010 has a rotational axis for adjusting the position along the direction of the first axis (x direction in the drawing) of the two axes orthogonal to the optical axes of the light sources 101R, 101G, and 101B. Is inserted, the first eccentric cam C1 in which the cam contacts the end of the cooling fin 1011 and the second axis orthogonal to the first axis among the two axes orthogonal to the optical axes of the light sources 101R, 101G, and 101B. In order to adjust the position along the direction of the shaft (y direction in the figure), a second eccentric cam C2 in which the rotation shaft is inserted into the cooling fin 1011 and the cam abuts against the end of the holding plate 1020 is provided.

  The first eccentric cam C1 and the second eccentric cam C2 are provided independently corresponding to the light sources 101R, 101G, and 101B, and the light sources 101R, 101G, and the like are respectively provided by the eccentric cams C1 and C2. 101B can be finely adjusted independently along the x and y directions.

  FIG. 7B is a cross-sectional view taken along the line bb of FIG. The first eccentric cam C <b> 1 is disposed at the notch portion of the pressing plate 1020 so as not to interfere with the pressing plate 1020, and the rotation shaft is inserted into the base material 1010. The cam portion is provided so as to contact the end portion of the cooling fin 1011. Accordingly, the cooling fin 1011 can be pressed in the x-axis direction by the rotation of the cam portion.

  FIG. 7C is a cross-sectional view taken along the line cc of FIG. The second eccentric cam C <b> 2 is arranged in a state in which the rotating shaft is inserted into the flange portion of the cooling fin 1011 at the cut portion of the pressing plate 1020. And the cam part is provided so that it may contact | abut to the edge part of the notch part of a holding | suppressing plate. Thereby, the end of the cut portion of the pressing plate 1020 is pressed by the rotation of the cam portion, and the cooling fin 1011 can be moved in the y-axis direction by the reaction.

  FIG. 8 is a schematic perspective view of the eccentric cam. The eccentric cams C1 and C2 are composed of a rotation shaft and a cam portion, and the center of the rotation shaft is provided at a position shifted from the center of the cylindrical cam portion. The rotating shaft has a cylindrical shape, and a groove for attaching a retainer such as a C-shaped clip is provided at the tip. By rotating the cam portion around the rotation axis, the object with which the cam portion abuts can be moved by the cam action.

  Here, the movement of the light source by the rotation of the eccentric cams C1 and C2 will be described with reference to FIG. In addition, since the operation | movement by rotation of the eccentric cam C1 and C2 is the same in each light source 101R, 101G, 101B, the movement is demonstrated below using the light source 101R as a representative.

  As for the light source 101R, the first eccentric cam C1 is provided on the left side in the drawing, the rotation shaft is inserted into the base material 1010, and the cam portion is in contact with the left end surface in the drawing of the cooling fin 1011 of the light source 101R. Yes.

  Therefore, when the cam portion of the first eccentric cam C1 is rotated, the distance from the rotation shaft to the contact position of the cam portion with the cooling fin 1011 changes, and the cooling fin 1011 can be moved in the x-axis direction. it can. In order to adjust the position of the light source 101R, the first eccentric cam C1 is rotated with the bolt B for fixing the holding plate 1020 slightly loosened. As a result, the light source 101R can move in the x-axis direction via the cooling fin 1011. The optical axis adjustment is performed with the optical axis of a subsequent optical unit or projection lens in a state where light is emitted from the light source 101R. Then, in a state where the adjustment is completed, the fixing bolt B of the presser plate 1020 is tightened to perform secure fixing.

  The second eccentric cam C2 is provided on each of the left and right flange portions of the cooling fin 1011. The rotating shaft of the second eccentric cam C2 is inserted into the flange portion of the cooling fin 1011. The cam portion is in contact with a cut portion provided along the x-axis direction of the pressing plate 1020.

  Therefore, when the cam portion of the second eccentric cam C2 is rotated, the distance from the rotation shaft to the contact position of the cam portion with the pressing plate 1020 changes, and the cooling fin 1011 is in the y-axis with respect to the pressing plate 1020. It will move to the direction. In order to adjust the position of the light source 101R, the second eccentric cam C2 is rotated in a state where the bolt B for fixing the pressing plate 1020 is slightly loosened. As a result, the light source 101R can move in the y-axis direction via the cooling fin 1011 with reference to the holding plate 1020. The optical axis adjustment is performed with the optical axis of a subsequent optical unit or projection lens in a state where light is emitted from the light source 101R. Then, in a state where the adjustment is completed, the fixing bolt B of the presser plate 1020 is tightened to perform secure fixing.

  In this manner, the light sources 101R, 101G, and 101B are sandwiched and fixed to the base material 1010 by the pressing plate 1020 via the cooling fins 1011 and the eccentric cams C1 and C2 described above are used, whereby each of the light sources 101R, 101G. , 101B can be finely adjusted in the x and y directions with the substrate 1010 attached, and accurate optical axis alignment can be performed with the light sources 101R, 101G, and 101B incorporated in the actual product.

It is a schematic diagram explaining the rear projector which is an example of the display apparatus which concerns on this embodiment. It is a schematic diagram which shows the example of the liquid crystal projector which is an example of the display apparatus which concerns on this embodiment. It is a model perspective view explaining the light source device which concerns on this embodiment. It is a model perspective view of a light source device. It is a model side view of a light source device. It is a model rear view of a light source device. It is sectional drawing of the vicinity of the fixing bolt and the eccentric cam. It is a model perspective view of an eccentric cam.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display device, 10 ... Optical compensator, 100 ... Optical component, 101 ... Light source device, 101R ... Light source, 101G ... Light source, 101B ... Light source, 102 ... Lens part, 1000 ... Liquid crystal projector, 1010 ... Base material, 1020 ... Presser plate, 1000U ... Optical unit, C1 ... First eccentric cam, C2 ... Second eccentric cam

Claims (3)

A light source;
Cooling means attached to the light source;
A base material for positioning along the optical axis direction of the light source;
A pressing plate for sandwiching and fixing the cooling means between the base material;
In order to adjust the position along the direction of the first axis out of the two axes orthogonal to the optical axis of the light source, a first shaft is inserted into the base and the cam contacts the end of the cooling means. Core cam,
In order to adjust the position along the direction of the second axis orthogonal to the first axis among the two axes orthogonal to the optical axis of the light source, a rotating shaft is inserted into the cooling means, and the end of the holding plate is A light source device comprising: a second eccentric cam with which the cam abuts. A plurality of the light sources are provided, and the cooling means, the pressing plate, the first eccentric cam, and the second eccentric cam are provided corresponding to each light source. 1. The light source device according to 1. A light source device;
An optical unit that divides the light emitted from the light source device into a plurality of colors, guides the light to a display element corresponding to each color, and synthesizes the light modulated by each display element;
In a display device comprising a projection optical system that projects light synthesized by the optical unit,
The light source device is
A light source;
Cooling means attached to the light source;
A base material for positioning along the optical axis direction of the light source;
A pressing plate for sandwiching and fixing the cooling means between the base material;
In order to adjust the position along the direction of the first axis out of the two axes orthogonal to the optical axis of the light source, a first shaft is inserted into the base and the cam contacts the end of the cooling means. Core cam,
In order to adjust the position along the direction of the second axis orthogonal to the first axis among the two axes orthogonal to the optical axis of the light source, a rotating shaft is inserted into the cooling means, and the end of the holding plate is And a second eccentric cam with which the cam abuts.