JP2011228150A - Lamp unit and video projection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lamp unit capable of easily and surely adjusting a light-axis position in a simple structure.SOLUTION: The lamp unit is provided with a light source lamp 1, a lamp-holding member 2 holding the light source lamp, a positional adjustment member 3 for movably holding the lamp-holding member 2 in an X-direction, and a front-side lamp case 4 for movably holding the positional adjustment member 3 in a Y-direction. Furthermore, the lamp unit is provided with a spring 7 for biasing the lamp-holding member 2 and the positional adjustment member 3 toward the lamp case 4.

Description

  The present invention relates to a lamp unit capable of adjusting the optical axis position of a lamp light source, and an image projection apparatus including the lamp unit.

  2. Description of the Related Art Conventionally, image projection apparatuses such as DMD (Digital Micromirror Device) projectors are widely used as one of image display apparatuses. As is well known, in this type of image projection apparatus, a lamp unit including a light source lamp is mounted in a set body. Then, by irradiating the DMD element with a light beam from the light source lamp and modulating the DMD element with a video signal, the video display device emits video light, and the emitted light is transmitted to a screen or the like via a lens. Magnify.

  However, in the image projection apparatus having the above-described configuration, if the light source lamp optical axis and the image projection apparatus optical system optical axis are not accurately aligned, uneven illuminance distribution of the projected image and illuminance decrease occur. For this reason, the installation of the light source lamp requires a highly accurate optical axis adjustment operation. Patent Document 1 exists as a prior document relating to the lamp optical axis adjustment mechanism.

  In the technique according to Patent Document 1, the lamp unit is divided into a lamp holding part and a base part. The lamp holder is provided with an optical axis adjusting rotary shaft hole, a fixing arcuate elongated hole, and an optical axis adjusting notch. The base portion is provided with an optical axis adjusting rotary shaft that fits into the optical axis adjusting rotary shaft hole. The lamp unit mounting portion is provided with an optical axis adjusting window and a screw insertion hole for a lamp holding portion fixing screw.

JP 2002-244204 A (FIG. 1)

  However, in the configuration according to Patent Document 1, the lamp holding portion fixing screw of the lamp holding portion is loosened during the optical axis adjustment. For this reason, since the lamp holding part is merely placed on the base part, when an external force is applied to the lamp holding part in order to adjust the optical axis, the lamp holding part is easily placed between the lamp holding part and the base part. A gap is created.

  Even if the optical axis is adjusted to a desired position in the state where the gap is generated, if the lamp holding portion fixing screw is tightened, the above gap will be displaced, and the optical axis cannot be adjusted accurately. The technology according to Patent Document 1 was possessed.

  Further, the lamp holding part easily moves until the lamp holding part fixing screw is tightened. For this reason, until the lamp holding part fixing screw is tightened even after the optical axis adjustment, the lamp holding part must be held constantly so as not to move in an unintended direction. The technology according to Patent Document 1 was possessed.

  Therefore, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a lamp unit that can easily and surely adjust the optical axis position with a simple mechanism. And Furthermore, an object of the present invention is to provide an image projection apparatus provided with the lamp unit.

  In order to achieve the above object, in a lamp unit according to the present invention, a light source lamp, a lamp holding member that holds the light source lamp, and the lamp holding member are crossed with the direction of the optical axis of the light source lamp. A position adjusting member that is held movably in one direction, and a first lamp that holds the position adjusting member movably in a second direction that intersects the direction of the optical axis and is different from the first direction. A case, and a biasing member that biases the lamp holding member and the position adjustment member toward the first lamp case.

  The lamp unit according to the present invention includes a biasing member that biases the lamp holding member and the position adjustment member to the first lamp case.

  Therefore, since the lamp holding member and the position adjusting member are urged to the first lamp case by the urging member, the lamp holding member, the position adjusting member, and the first lamp case are also adjusted during the optical axis adjustment. There are no gaps between the members. Therefore, the optical axis is not displaced even after the optical axis is adjusted. Therefore, accurate optical axis adjustment with high accuracy is possible with a simple mechanism.

  Further, a frictional force is generated between the lamp holding member, the position adjusting member, and the first lamp case by the biasing member. Therefore, it is possible to prevent the lamp holding member and the position adjusting member from being inadvertently shifted in an unintended direction during the optical axis adjustment. Therefore, holding with a jig or the like is not necessary, and the optical axis adjustment is easy.

FIG. 3 is an exploded perspective view showing a configuration of a lamp unit having an optical axis adjustment function in the first embodiment. It is an expansion disassembled perspective view which shows the structure of the light source lamp 1 and the lamp holding member 2 part. It is an expansion disassembled perspective view which shows the structure of the position adjustment member 3 and the front lamp case 4 part. It is an expansion disassembled perspective view which shows the structure of the rear lamp case 5 and the pressing metal fitting 6 part. FIG. 10 is a cross-sectional view showing the shape of a hole and a protrusion guide portion provided in a rear lamp case in the second embodiment. 1 is a cross-sectional view showing a configuration of a light source lamp 1. FIG. 6 is an exploded perspective view showing a configuration of a rectifying fin held by a lamp holding member 2 in Embodiment 3. FIG. 10 is an exploded perspective view showing the configuration of position reference holes 2g, 3f, 4f in the fourth embodiment.

  An image projection apparatus such as a DMD projector includes a light source lamp that emits light for displaying an image on a screen or the like. Specifically, in the image projection apparatus, a lamp unit including the light source lamp is mounted in the set body. The lamp unit stores a light source lamp and serves as a replacement unit when the lamp is replaced.

  In the video display device, a light beam from a light source lamp is irradiated onto a DMD element, and the DMD element is modulated by a video signal to emit video light, and the emitted light is enlarged and irradiated onto a screen or the like via a lens. .

  Hereinafter, the lamp unit having the optical axis adjusting mechanism of the light source lamp will be specifically described with reference to the drawings.

<Embodiment 1>
FIG. 1 is an exploded perspective view showing an embodiment of a lamp unit according to the present invention. 2 is an enlarged exploded perspective view of the light source lamp 1 and the lamp holding member 2 of FIG. 3 is an enlarged exploded perspective view of the position adjusting member 3 and the front lamp case 4 of FIG. Further, FIG. 4 is an enlarged exploded perspective view of the rear lamp case 5 and the holding bracket 6 of FIG.

  Hereinafter, the structure of the lamp unit according to the present invention will be described with reference to exploded perspective views shown in FIGS. 1 to 4 also show the X direction, the Y direction, and the Z direction. Here, the Z direction is the optical axis direction of the light source lamp 1, and the X direction and the Y direction are directions perpendicular to the Z direction. The X direction and the Y direction are perpendicular to each other. The Z-axis direction is a direction parallel to the optical axis direction of the light source lamp 1.

  The light source lamp 1 is disposed between the presser fitting 6 and the lamp holding member 2. Screws 10 are screwed into the holes 6 a of the presser fitting 6 and the screw holes 2 d of the lamp holding member 2. Accordingly, the light source lamp 1 is positioned on the lamp holding member 2 by the presser fitting 6, and the light source lamp 1 is held and fixed to the lamp holding member 2.

  The lamp holding member 2 is provided with a slide hole 2a which is long in the X direction in the drawing. The slide hole 2 a engages with a circular guide pin 3 b provided on the position adjustment member 3. By fitting the slide hole 2a and the circular guide pin 3b, the lamp holding member 2 is held in the position adjusting member 3 in the X direction (can be grasped as the first direction) with respect to the position adjusting member 3. It becomes possible to move. Here, the movable range of the lamp holding member 2 is a range of the drilling length in the X direction of the slide hole 2a.

  Furthermore, a slit 2 c is provided near the side surface of the lamp holding member 2, and a screw hole 3 c is provided near the side surface of the position adjusting member 3. On the other hand, the position adjustment screw (which can be grasped as the first position adjustment mechanism) 8A has a slit portion 8a formed on the side surface. In this configuration, the slit 2c of the lamp holding member 2 is engaged with the slit portion 8a of the position adjusting screw 8A, and the position adjusting screw 8A is screwed into the screw hole 3c of the position adjusting member 3. Therefore, the relative position in the X direction of the lamp holding member 2 with respect to the position adjusting member 3 can be freely adjusted by rotating the position adjusting screw 8A.

  Further, the position adjusting member 3 that holds the lamp holding member 2 so as to be movable in the X direction is provided with a slide hole 3a that is long in the Y direction in the drawing. The slide hole 3a engages with a circular guide pin 4b provided in the front lamp case (which can be grasped as a first lamp case) 4. By fitting the slide hole 3a and the circular guide pin 4b, the position adjusting member 3 is held in the front lamp case 4 in the Y direction (can be grasped as the second direction) with respect to the front lamp case 4. It becomes possible to move. Here, the movable range of the position adjusting member 3 is the range of the drilling length in the Y direction of the slide hole 3a.

  Further, a slit 4 c is provided near the top surface of the front lamp case 4, and a screw hole 3 d is provided near the top surface of the position adjusting member 3. On the other hand, the position adjustment screw (which can be grasped as the second position adjustment mechanism) 8B has a slit portion 8b formed on the side surface. In this configuration, the slit 4c of the front lamp case 4 is engaged with the slit portion 8b of the position adjusting screw 8B, and the position adjusting screw 8B is screwed into the screw hole 3d of the position adjusting member 3. Therefore, the relative position in the Y direction of the position adjusting member 3 with respect to the front lamp case 4 can be freely adjusted by rotating the position adjusting screw 8B.

  The position adjustment member 3 held by the front lamp case 4 holds the lamp holding member 2 through fitting between the circular guide pin 3b and the slide hole 2a. Therefore, as the position adjusting member 3 moves in the Y direction, the lamp holding member 2 also moves in the Y direction. Since the lamp holding member 2 holds the light source lamp 1, naturally, as the position adjusting member 3 moves in the Y direction, the light source lamp 1 also moves in the Y direction.

  Further, the lamp holding member 2, the position adjusting member 3, and the front lamp case 4 are sandwiched by a clip-shaped spring (which can be grasped as an urging member) 7. The lamp holding member 2 and the position adjusting member 3 are urged toward the front lamp case 4 by being sandwiched by the spring 7.

  The spring 7 is provided with a hole 7a, and the front lamp case 4 is provided with a circular protrusion 4d that engages with the hole 7a. The spring 7 is held by fitting the hole 7a and the circular protrusion 4d. Further, the upper limit end region of the position adjusting member 3 in the vicinity of the hole 3e drilling and the upper and lower end region of the lamp holding member 2 in the vicinity of the hole 2b drilling are regions sandwiched by the springs 7.

  In addition, holes 2 b are provided in the four corner portions of the lamp holding member 2, and holes 3 e are provided in the four corner portions of the position adjusting member 3, and the four corner portions of the front lamp case 4 are provided. The part is provided with a screw hole 4e. The lamp holding member 2 and the position adjusting member 3 are fixed to the front lamp case 4 by screwing a fixing screw (which can be grasped as a fixing mechanism) 9 into the hole 2b, the hole 3e, and the screw hole 4e.

  The rear lamp case (which can be grasped as a second lamp case) 5 has a box shape so as to cover the light source lamp 1, and holes 5a are provided on the top and bottom surfaces of the front end. On the other hand, screw holes 4 a are also provided on the top and bottom surfaces of the front lamp case 4. By screwing the screw 11 into the hole 5a and the screw hole 4a, the rear lamp case 5 and the front lamp case 4 are fixed in a combined state.

  The rear lamp case 5 is provided with an adjustment window 5b1 at a position corresponding to the position adjustment screw 8A, and an adjustment window 5b2 is provided at a position corresponding to the position adjustment screw 8B. It has been. In a state where the light source lamp 1, the lamp holding member 2, the position adjusting member 3, the front lamp case 4 and the rear lamp case 5 are combined, the position adjusting screws 8A and 8B are exposed from the adjustment windows 5b1 and 5b2.

  Furthermore, a driver hole 5 c is provided on the rear surface of the rear lamp case 5 at a position corresponding to the fixing screw 9 described above. In a state where the light source lamp 1, the lamp holding member 2, the position adjusting member 3, the front lamp case 4 and the rear lamp case 5 are combined, the fixing screw 9 is exposed from the driver hole 5c.

  In the above configuration (a state in which the light source lamp 1, the lamp holding member 2, the position adjusting member 3, the front lamp case 4 and the rear lamp case 5 are combined), the driver of the rear lamp case 5 is used when adjusting the lamp optical axis. A screwdriver is inserted through the hole 5c, and the fixing screw 9 is loosened. The fixing screw 9 may be loosened in advance. Next, the position adjustment screw 8A is rotated from the adjustment window 5b1 to adjust the lamp optical axis in the X direction, and the position adjustment screw 8B is rotated from the adjustment window 5b2 to adjust the lamp optical axis in the Y direction. Do it.

  At this time, since the lamp holding member 2 and the position adjusting member 3 are fixed simultaneously with the fixing screw 9, when the fixing screw 9 is loosened, the X direction and the Y direction are adjusted alternately or simultaneously. You can also.

  When the adjustment of the lamp optical axis is completed, a screwdriver is inserted from the screw hole 5c of the rear lamp case 5 and the fixing screw 9 is tightened.

  As described above, the lamp unit according to the present embodiment includes the clip-shaped spring 7 that urges the lamp holding member 2 and the position adjustment member 3 toward the front lamp case 4.

  Therefore, since the lamp holding member 2 and the position adjusting member 3 are urged toward the front lamp case 4 by the spring 7, the lamp holding member 2, the position adjusting member 3, and the There are no gaps between the members of the front lamp case 4. Therefore, the optical axis does not shift when the optical axis is adjusted and when the fixing screw 9 is tightened. Therefore, in the lamp unit according to the present embodiment, accurate and reliable optical axis adjustment can be performed with a simple mechanism.

  In addition, a frictional force is generated between the lamp holding member 2, the position adjusting member 3, and the front lamp case 4 by the bias of the spring 7. Therefore, it is possible to prevent the lamp holding member 2 and the position adjusting member 3 from being inadvertently shifted in an unintended direction during the optical axis adjustment. Therefore, the lamp unit according to the present embodiment does not need to be held by a jig or the like, and the optical axis can be easily adjusted.

  Further, since the image projection apparatus includes the lamp unit according to the present embodiment, the lamp optical axis position of the lamp unit can be easily and reliably adjusted. Therefore, in the video projection device, it is possible to prevent uneven illuminance distribution or a decrease in illuminance of the projected image.

<Embodiment 2>
FIG. 5 is a side sectional view showing the configuration of the rear lamp case 5 according to the present embodiment.

  As described in the first embodiment, the rear surface of the rear lamp case 5 is provided with a driver hole 5c at a position corresponding to the fixing screw 9 (see FIGS. 1, 4 and 5). Furthermore, in the rear lamp case 5 according to the present embodiment, as shown in FIG. 5, a projection guide portion 5d is provided so as to be connected to the driver hole 5c.

  The projection guide portion 5d extends in the direction in which the fixing screw 9 exists in a state where the light source lamp 1, the lamp holding member 2, the position adjustment member 3, the front lamp case 4 and the rear lamp case 5 are combined, and is hollow. It has a shape (for example, a cylindrical shape).

  When the fixing screw 9 is loosened and when the fixing screw 9 is tightened (hereinafter referred to as a tightening process), a driver is inserted into the driver hole 5c and the protrusion guide portion 5d.

  The configuration of the lamp unit according to the present embodiment other than the protrusion guide portion 5d is the same as the configuration of the lamp unit according to the first embodiment.

  As described above, the rear lamp case 5 according to the present embodiment is provided with not only the driver hole 5c but also the protrusion guide portion 5d, so that the driver shaft can be tightened when the fixing screw 9 is tightened. , Kept accurate. Therefore, since the fixing screw 9 and the driver tip can be easily fitted, the tightening process of the fixing screw 9 using a screwdriver becomes easy.

  The shape of the protrusion guide portion 5d is not limited to a cylindrical shape as long as it is hollow. For example, as long as the shaft of the driver can be held with high accuracy, a polygon, a U-shape, or a shape combining ribs may be used.

<Embodiment 3>
FIG. 6 is a cross-sectional view showing the structure of the light source lamp 1.

  The light source lamp 1 has an arc tube bulb 1a, an arc tube tip 1b, and an arc tube neck 1c. At the upper part of the arc tube sphere 1a, the temperature is 1000 ° C. or less, at the lower part of the arc tube sphere 1a, the temperature is 950 ° C. ± 20 ° C., at the arc tube tip 1b, the temperature is 400 ° C. or less, and at the arc tube neck 1c The light source lamp 1 is set with cooling conditions such that the temperature is 420 ° C. or lower.

  In the image projection apparatus, temperature management is performed so as to satisfy these cooling conditions. Since these light emitting portions 1a, 1b, and 1c are very hot, a means for cooling them is necessary. For example, a cooling fan is placed in the vicinity of the light source lamp 1, and cooling is performed by sending cooling air to the lamp light emitting unit.

  However, when the optical axis adjusting structure described in the first embodiment is provided, the distance between the light source cooling fan and the lamp arc tube portion that is a heating element is variable. For this reason, the cooling air does not strike the arc tube well, and temperature management becomes difficult.

  Therefore, in this embodiment, as shown in FIG. 7, the rectifying fins 12 are provided so as to be held by the lamp holding member 2 holding the light source lamp 1. Specifically, a rectifying fin 12 for rectifying air that cools the arc tube of the light source lamp 1 is provided in the vent hole 2 e of the lamp holding member 2.

  The straightening fins 12 are provided with holes 12a, and the lamp holding member 2 is provided with screw holes 2f on both side surfaces of the vent holes 2e. By screwing the screw 13 into the hole 12a and the screw hole 2f, the rectifying fin is fixed to the vent hole 2e provided in the upper part of the lamp holding member 2.

  As described above, the present embodiment further includes the rectifying fins 12 that rectify the air that is held by the lamp holding member 2 and that cools the light source lamp 1. Thereby, even if the optical axis is adjusted, the positional relationship between the arc tube of the light source lamp 1 and the rectifying fin 12 is always constant. Therefore, the flow of the cooling air with respect to the light source lamp 1 is always constant, and a stable cooling effect can be obtained.

<Embodiment 4>
When performing the optical axis adjustment by the optical axis adjustment structure described in the first embodiment, if the optical axis adjustment is started from a state where the lamp holding member 2 and the position adjustment member 3 are at appropriate positions, the adjustment amount increases and the work is increased. Becomes complicated.

  Therefore, in the present embodiment, as shown in FIG. 8, the lamp holding member 2 is provided with a position reference hole 2g at a position serving as a design reference for determining the initial reference position. The position adjusting member 3 is provided with a position reference hole 3f at a position that serves as a design reference for determining the initial reference position. Similarly, the front lamp case 4 is provided with a position reference hole 4f at a position serving as a design reference for determining the initial reference position.

  A pin (not shown) is communicated with each position reference hole 2g, 3f, 4f. Thereby, the optical axis can be easily adjusted to the design reference position simultaneously in both the X and Y axis directions in the figure.

  As described above, in the present embodiment, setting to the design reference position is easy by providing the position reference holes 2g, 3f, and 4f in each of the lamp holding member 2, the position adjusting member 3, and the front lamp case 4. It becomes. In addition, since the optical axis adjustment can be started from the design reference position, the optical axis adjustment can be performed only for the variation of the optical axis of the light source lamp 1, the adjustment amount is reduced, and the optical axis adjustment work is efficiently performed. it can.

  In the example of FIG. 8, the position reference holes 2 g, 3 f, and 4 f are one for each of the lamp holding member 3, the position adjustment member 3, and the front lamp case 4. However, a plurality of position references are provided for each of the lamp holding member 2, the position adjustment member 3, and the front lamp case 4 so that, for example, the same lamp unit can be used for an image projection apparatus including optical system units having different optical axis positions. Holes 2g, 3f, 4f may be provided.

  1 light source lamp, 1a arc tube sphere, 1b arc tube tip, 1c arc tube neck, 2 lamp holding member, 2a slide hole, 2b hole, 2c slit, 2d screw hole, 2e vent hole, 2f screw hole, 2g Position reference hole, 3 Position adjustment member, 3a Slide hole, 3b Circular guide pin, 3c Screw hole, 3d Screw hole, 3e hole, 3f Position reference hole, 4 Front lamp case, 4a Screw hole, 4b Circular guide pin, 4c Slit, 4d Circular protrusion, 4e Screw hole, 4f Position reference hole, 5 Rear lamp case, 5a hole, 5b1, 5b2 Adjustment window, 5c Driver hole, 5d Protrusion guide, 6 Holding bracket, 6a hole, 7 Spring, 7a hole, 8A, 8B Position adjustment screw, 8a, 8b Slit, 9 Fixing screw, 10, 11, 13 Screw, 12 Rectification fin, 1 a hole.

Claims (6)

A light source lamp,
A lamp holding member for holding the light source lamp;
A position adjusting member that holds the lamp holding member so as to be movable in a first direction intersecting the direction of the optical axis of the light source lamp;
A first lamp case that holds the position adjusting member movably in a second direction that intersects the direction of the optical axis and is different from the first direction;
A biasing member that biases the lamp holding member and the position adjustment member toward the first lamp case;
A lamp unit characterized by that. A first position adjusting mechanism for adjusting movement of the lamp holding member in the first direction;
A second position adjustment mechanism for adjusting movement of the position adjustment member in the second direction;
A fixing mechanism for fixing the lamp holding member and the position adjusting member to the first lamp case;
The lamp unit according to claim 1. A second lamp case that covers the light source lamp in combination with the first lamp case;
In the position corresponding to the fixing mechanism in the second lamp case,
With holes,
A hollow guide portion connected to the hole and extending in a direction in which the fixing mechanism exists,
Provided,
The lamp unit according to claim 2. A fin that rectifies air that is held by the lamp holding member and that cools the light source lamp;
The lamp unit according to claim 1. In each of the lamp holding member, the position adjusting member, and the first lamp case,
A position reference hole for defining the reference position is provided,
The lamp unit according to claim 1. An image projection apparatus including a light source device that emits light for displaying an image on a screen,
The lamp unit according to any one of claims 1 to 5 is provided as the light source device.
An image projection apparatus characterized by that.

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