JP2002258404A - Lamp unit, projector, method of fixing light source lamp to reflector, and method of assembling lamp unit - Google Patents

Abstract

(57) [Summary] A lamp unit, a projector, a method of fixing a light source lamp and a reflector, and a method of assembling the lamp unit, which can easily improve the accuracy of a reflector and can support a light source lamp in a good state. To provide. SOLUTION: In a lamp unit 10, a light source lamp 11 and a reflector 12 are fixed to a lamp housing 13 independently of each other. Therefore, it is not necessary to form a mounting portion for mounting and fixing the light source lamp 11 on the reflector 12 which is an optical component, so that the shape of the reflector 12 is simplified and the reflection surface 121 (particularly the reflection surface 12) is formed.
1 (the bottom part of 1), and the illuminance of the lamp unit 10 can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a lamp unit,
The present invention relates to a projector, a method of fixing a light source lamp to a reflector, and a method of assembling a lamp unit. More specifically, the present invention relates to a lamp unit including a light source lamp, a reflector that reflects light from the light source lamp, and the lamp unit. The present invention relates to a projector, a method for fixing a light source lamp and a reflector, and a method for assembling a lamp unit assembled using the fixing method.

[0002]

2. Description of the Related Art Conventionally, it has been known to use a projector for presentations at conferences, conferences, exhibitions, and the like. In such a projector, a light beam emitted from the lamp unit is modulated according to image information to form an optical image, and the optical image is enlarged and projected. Here, the lamp unit is configured to include a light source lamp having a light emitting unit that emits light rays, and a substantially cone-shaped (cup-shaped) reflector that reflects light rays from the light emitting units. The light source lamp is directly fixed to the bottom portion of the reflector with cement or the like in a state where the light emitting portion is disposed at substantially the same position as the focal point of the reflector, and the light emitting portion of the light source lamp and the portion near the light emitting portion are housed in the reflector. .

[0003]

However, in the lamp unit as described above, a mounting portion for mounting and fixing the light source lamp needs to be formed on the bottom of the reflector, so that the shape of the reflector becomes complicated. There is a problem that it is difficult to improve the accuracy of the reflection surface. Also, since the mounting part is formed on the reflector which is an optical component,
In consideration of the accuracy of the reflecting surface of the reflector, it is not possible to form a mounting portion having an optimal shape for supporting and fixing the light source lamp, that is, a mounting portion having a complicated shape or the like. There is a possibility that it can not be supported in a state.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lamp unit, a projector, a method of fixing a light source lamp and a reflector, and a method of assembling the lamp unit, in which the accuracy of the reflector can be easily improved and the light source lamp can be favorably supported. Is to provide.

[0005]

A lamp unit according to the present invention has the following arrangement to achieve the above object.
A lamp unit according to the present invention includes a light source lamp having a light emitting portion, a reflector in which the light emitting portion of the light source lamp is disposed, and which reflects light emitted from the light emitting portion, and the light source lamp and the reflector are fixed. A lamp unit comprising a fixing member, wherein the light source lamp and the reflector are fixed to the fixing member independently of each other, and are fixed to the fixing member of the light source lamp. A portion between the portion and the light emitting portion is exposed to the outside of the reflector. Here, the fixing member may be formed integrally or may be divided into a plurality.

According to the present invention, since the light source lamp and the reflector are fixed to the fixing member independently of each other, the light source lamp as described in the background art is attached and fixed to the reflector which is an optical component. It is not necessary to form a mounting portion for the connection. Thereby, the shape of the reflector can be simplified, the accuracy of the reflection surface can be easily improved, and the illuminance of the lamp unit can be increased. And, since the light source lamp is attached to the fixing member, unlike the conventional method in which the shape and the like of the attachment portion had to be determined in consideration of the accuracy of the reflector, the light source lamp had an optimal shape and the like for supporting and fixing the light source lamp. By providing the mounting structure (a structure corresponding to the mounting portion of the conventional reflector) on the fixing member, the light source lamp can be favorably supported.

Further, in the light source lamp, a portion between the light emitting portion and the fixed portion, that is, a portion which is disposed near the light emitting portion and which tends to increase in temperature during lighting is exposed to the outside of the reflector. Is easier to escape. For this reason, the portion can be cooled and the light-emitting portion does not easily reach a high temperature, and the life of the light source lamp can be extended. Conventionally, as described above, since the light emitting portion and the portion near the light emitting portion of the light source lamp are housed in the reflector,
At the time of lighting, the temperature of the light source lamp tends to be high, and the life of the light source lamp may be shortened. In contrast,
In the present invention, since the light source lamp is fixed to the fixing member, the portion (fixed portion) remote from the light emitting portion is supported and fixed, and the portion between the light emitting portion and the fixed portion can be exposed to the outside of the reflector. It has become.

In the lamp unit of the present invention, a light transmitting member for protection may be provided on the light emitting side of the reflector. According to the present invention, since the light emitting side of the reflector is covered with the light transmitting member, even if the light source lamp ruptures, the fragments can be prevented from scattering outside the reflector.

In the lamp unit of the present invention, it is preferable that the light transmitting member is divided into a plurality of parts. According to the present invention, the light transmitting member is divided into a plurality of pieces in advance, and is made of, for example, a plurality of small glass plates. Thereby, at the time of lighting, when the temperature inside the reflector rises with the rise in the temperature of the light source lamp, cracks in the light transmitting member due to thermal deformation, cracks generated when processing the insertion hole in the light transmitting member, etc. Cracks of the light transmitting member due to the cause can be prevented.

In the lamp unit according to the present invention, it is preferable that the light transmitting member is fixed to the fixing member. According to the present invention, since the light transmitting member is fixed to the fixing member, the mounting operation can be facilitated differently from the case where the light transmitting member is mounted on the reflector. In particular, in the case of using the divided light transmitting member according to the third aspect, for example, it is necessary to attach small glass plates and the like which are arranged in close proximity one by one, and the attaching operation becomes complicated. The workability is improved by attaching a split light transmitting member to the fixing member.

In the lamp unit of the present invention, it is preferable that an air flow passage penetrating through the holding portion is formed in the holding portion of the fixing member to which the fixing portion of the light source lamp is fixed and held. According to the present invention, since the air flow passage is formed in the holding portion of the fixing member, the fixing portion of the light source lamp fixed and held in the holding portion can be efficiently cooled,
The life of the light source lamp can be extended. Further, since the air flow passage is formed in the holding portion of the fixing member, the shape of the reflector does not need to be complicated, and the air flow passage can be easily formed.

A projector according to the present invention has the following arrangement to achieve the above object. A projector according to another aspect of the invention includes any one of the lamp units described above. According to the present invention, the lamp unit according to any one of claims 1 to 4 is mounted on a projector. According to such a projector, the same operation and effect as described above can be obtained.

On the other hand, the method of fixing the light source lamp and the reflector according to the present invention employs the following method to achieve the above object. The method of fixing a light source lamp and a reflector according to the present invention includes a step of fixing one of a light source lamp that emits a light beam and a reflector that reflects a light beam from the light source lamp to a fixing member; A step of positioning the other of the lamp and the reflector with respect to the one; and a step of fixing the other to the fixing member in a state independent of the one. Things.

On the other hand, the method of assembling the lamp unit of the present invention employs the following method to achieve the above object. A method of assembling a lamp unit according to the present invention is a method of assembling a lamp unit including a light source lamp that emits a light beam and a reflector that reflects a light beam from the light source lamp, wherein the light source lamp and the reflector are combined. The method includes a step of positioning the other with respect to the one, and a step of fixing the other to the fixing member in a state independent of the one.

In the invention according to the fixing method and the assembling method, since the light source lamp and the reflector are fixed to the fixing member independently of each other, the reflector as an optical component is provided with the light source as described in the background art. There is no need to form a mounting portion for mounting and fixing the lamp.
Thereby, the shape of the reflector can be simplified, the accuracy of the reflection surface can be easily improved, and the illuminance of the lamp unit can be increased. Then, since the light source lamp is fixed to the fixing member, unlike the conventional method, the shape of the mounting part has to be determined in consideration of the accuracy of the reflector. The light source lamp can be supported in a favorable state by providing the fixing member with the mounting structure (structure corresponding to the mounting portion of the conventional reflector). Further, since the light source lamp and the reflector are respectively positioned with respect to the fixing member, unlike the conventional lamp unit in which the light source lamp is integrally attached to the reflector, the degree of freedom of each positioning is increased, and the lamp unit is improved. Illuminance can be easily increased.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. [1. Overall description of optical unit in projector)
FIG. 1 schematically shows an optical unit 4 used in a projector 1 according to one embodiment of the present invention. The optical unit 4 is a unit that optically processes a light beam emitted from a light source to form an optical image corresponding to image information, and includes an integrator illumination optical system 41, a color separation optical system 42, a relay optical system 43, An electro-optical device 44, a cross dichroic prism 45, and a projection lens 46 are provided.

The integrator illumination optical system 41 supplies an optical beam to an image forming area of three liquid crystal panels 441 (shown as liquid crystal panels 441R, 441G, and 441B for each color light) constituting the electro-optical device 44. And the lamp unit 10, the UV filter 418, the parallelizing lens 413, the first lens array 414, the second lens array 416, the polarization conversion element 415, and the superimposing lens 4.
19 and a reflection mirror 424.

The lamp unit 10 includes a light source lamp 11 as a radiation light source for emitting a radial light beam,
It has a reflector 12 for reflecting the radiated light emitted from the light source lamp 11, and a lamp housing 13 (see FIG. 2 et seq.) As a fixing member to be described later. As the light source lamp 11, a halogen lamp, a metal halide lamp, or a high-pressure mercury lamp is often used. As the reflector 12, an ellipsoidal mirror is used. In addition, about the structure of such a lamp unit 10,
Details will be described later.

The first lens array 414 has a configuration in which small lenses 414A each having a substantially rectangular outline viewed from the optical axis direction are arranged in a matrix. Each small lens 41
4A is the UV filter 4 emitted from the light source lamp 11
The light beam passing through 18 and the collimating lens 413 is split into a plurality of partial light beams. The contour shape of each small lens 414A is set to be substantially similar to the shape of the image forming area of the liquid crystal panel 441. For example, the liquid crystal panel 4
If the aspect ratio (ratio between the horizontal and vertical dimensions) of the 41 image forming area is 4: 3, the aspect ratio of each small lens 414A is also set to 4: 3.

The second lens array 416 has substantially the same configuration as the first lens array 414,
6A are arranged in a matrix. The second lens array 416 has a function of forming an image of each small lens 414A of the first lens array 414 on the liquid crystal panel 441 together with the superimposing lens 419.

The polarization conversion element 415 is disposed between the second lens array 416 and the superimposing lens 419, and converts the light from the second lens array 416 into one kind of polarized light. , Electro-optical device 44
The light use efficiency in the light is improved. Specifically, each partial light converted into one type of polarized light by the polarization conversion element 415 is substantially superimposed on the liquid crystal panels 441R, 441G, and 441B of the electro-optical device 44 by the superimposing lens 419. The projector 1 (the electro-optical device 4) of the present embodiment using a liquid crystal panel 441 of a type that modulates polarized light.
In 4), since only one type of polarized light can be used, almost half of the light from the light source lamp 11 that emits other types of randomly polarized light is not used. Therefore, the polarization conversion element 41
By using 5, the light emitted from the light source lamp 11 is all converted into one type of polarized light, and the light use efficiency of the electro-optical device 44 is increased. Note that such a polarization conversion element 415 is introduced in, for example, Japanese Patent Application Laid-Open No. 8-304739.

The color separation optical system 42 has two dichroic mirrors 421 and 422 and a reflection mirror 423, and the plurality of partial light beams emitted from the integrator illumination optical system 41 by these dichroic mirrors 421 and 422 are red. , Green, and blue light.

The relay optical system 43 includes an incident side lens 43.
1, relay lens 433, and reflection mirrors 432, 4
34, and has a function of guiding blue light among the color lights separated by the color separation optical system 42 to the liquid crystal panel 441B.

Here, the dichroic mirror 421 of the color separation optical system 42 reflects the blue light and the green light of the light beam emitted from the integrator illumination optical system 41 and transmits the red light. The red light transmitted by the dichroic mirror 421 is reflected by the reflection mirror 423,
Liquid crystal panel 4 for red through field lens 417
Reach 41R. This field lens 417 is
Each partial light beam emitted from the lens array 416 is converted into a light beam parallel to the central axis (principal ray). The same applies to the field lens 417 provided in front of the other liquid crystal panels 441G and 441B.

Of the blue light and the green light reflected by the dichroic mirror 421, the green light is reflected by the dichroic mirror 422, passes through the field lens 417, and reaches the liquid crystal panel 441G for green. On the other hand, the blue light passes through the dichroic mirror 422, passes through the relay optical system 43, and further passes through the field lens 417 to reach the liquid crystal panel 441B for blue light. The reason why the relay optical system 43 is used for blue light is that the optical path length of blue light is longer than the optical path lengths of other color lights, thereby preventing a reduction in light use efficiency due to light diffusion or the like. That's why. That is, this is for transmitting the partial light beam incident on the incident side lens 431 to the field lens 417 as it is.

The electro-optical device 44 includes liquid crystal panels 441R, 441G, and 441B serving as three light modulating devices.
These use, for example, a polysilicon TFT as a switching element, and each color light separated by the color separation optical system 42 is supplied to these three liquid crystal panels 441R and 441R.
The optical image is modulated by 41G and 441B in accordance with the image information.

The cross dichroic prism 45 includes three
A color image is formed by combining images modulated for each color light emitted from the liquid crystal panels 441R, 441G, and 441B. In the prism 45, a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light are formed in an approximately X shape along the interface between the four right-angle prisms. The three color lights are synthesized by the multilayer film. Then, the color image synthesized by the prism 45 is emitted from the projection lens 46 and is enlarged and projected on the screen.

[2. FIG. 2 is a plan view of the above-described lamp unit 10, FIG. 3 is a side view thereof, FIG. 4 is a longitudinal sectional view thereof, FIG. 5 is a front view thereof, and FIG.
7 shows a rear view thereof, and FIG. 7 shows an exploded perspective view thereof. The lamp unit 10 is housed inside a casing (not shown) of the projector 1, and includes a light source lamp 11, a reflector 12 for aligning and emitting light rays emitted from the light source lamp 11, and a light source lamp 11 and a reflector 12. And a lamp housing 13 as a fixing member fixed independently of each other.

The light source lamp 11 is, for example, a high-pressure mercury lamp, and includes an arc tube 111 made of glass and this arc tube 11.
1 and a pair of electrodes (not shown) housed inside. A light emitting portion 111A which is a central portion of the light emitting tube 111
Are both side portions 111B, 1 sandwiching the light emitting portion 111A.
It is swollen compared to 11C. The pair of electrodes face each other just inside the light emitting unit 111A, and the light source lamp 11 is turned on by the discharge between the pair of electrodes.

Also, both side portions 111B of the arc tube 111,
111C, one side portion 11 arranged on the left side in FIG.
The end of 1B penetrates a protective glass plate 14 as a light transmitting member described later. On the other hand, a fixing portion 111D is formed on the other side portion 111C disposed on the right side in FIG. 4, and the arc tube 111 is supported and fixed to the lamp housing 13 via the fixing portion 111D.

The reflector 12 is cup-shaped (substantially cone-shaped)
The inner surface is formed in an elliptical shape as shown in FIG. Such a reflector 12 is open on the left side (light emission side) in the figure, and has a bottom portion on the right side in the figure. A flange 122 for attaching the reflector 12 to the lamp housing 13 is formed in a peripheral portion of the opening of the reflector 12. In the center of the bottom part of the reflector 12, the light source lamp 1 is provided.
1 is formed.

In such a reflector 12, the arc tube 1
11 with the light emitting portion 111A disposed in the reflector 12, the other side portion 111C of the light emitting tube 111 is inserted into the insertion hole 12A.
3 is inserted. Here, the arrangement of the arc tube 111 and the reflector 12 is adjusted so that the center point of light emission in the light emitting section 111A is arranged at the focal position of the reflector 12. Note that the center point of light emission is defined as the arc tube 11.
1 means a position substantially at the center of a discharge path generated between a pair of electrodes.

The lamp housing 13 includes the projector 1
And a reflector holder 132 and a light source lamp holder 133 as a holder according to the present invention. And these bases 1
The reflector 31, the reflector holder 132, and the light source lamp holder 133 are integrally formed.

The reflector holding section 132 includes a main body 132A formed in a substantially rectangular frame shape (FIG. 5) and the main body 1A.
The two reinforcing portions 13 erected on both sides of the main body portion 132A and formed in a substantially triangular frame shape in order to reinforce the 32A.
2B. A protective glass plate 1 is provided on the back side of the frame of the main body 132A constituting the reflector holder 132.
4 are arranged. The protective glass plate 14 is divided into a plurality of pieces, and for example, in the present embodiment, is composed of four substantially rectangular small glass plates 141. In the center of such a protective glass plate 14, a through hole 14A is formed,
One side portion 111 of the arc tube 111 is provided in the through hole 14A.
The end of B is penetrated.

The main body 132A of the reflector holder 132
The peripheral edge of the opening of the reflector 12 is in contact with the rear side of the protective glass plate 14 to which no glass is attached, and the main body 132A of the reflector holding portion 132, the protective glass plate 1
4 and the clip 15 sandwiching the flange 122 of the reflector 12, the flange 122 of the reflector 12 and the protective glass plate 14 are pressed against the main body 132 </ b> A of the reflector holder 132, and the reflector 12 and the reflector holder 132 are attached to the lamp housing 13. Fixed. The clip 15 is, as shown in FIG.
In this embodiment, two protective glass plates 14 are used.
Are arranged on a diagonal line of each. Further, the protective glass plate 14 is attached to the reflector holding portion 13 using an appropriate adhesive.
2 may be fixed. As a result, the light emitting side of the reflector 12 is covered with the protective glass plate 14, and even if the arc tube 111 ruptures, fragments are generated.
2 so that it does not fly outside.

The light source lamp holder 133 is formed in a substantially U-shape (FIG. 2) when viewed from the bottom.
11 are arranged at positions separated by a predetermined distance along the longitudinal direction. As a result, the light emitting unit 111A of the light emitting tube 111 disposed inside the reflector 12 and the light source lamp holding unit 1
The portion between the arc tube 111 and the fixing portion 111 </ b> D supported by 33 is exposed outside the reflector 12,
The heat generated by the light source lamp 11 can easily escape from the portion, and can be cooled by applying cooling air.

A holding hole 134 (see FIG. 6) through which the fixing portion 111D of the arc tube 111 is inserted and fixed is formed substantially at the center of the upper portion of the light source lamp holding portion 133. The holding hole 134 has a substantially circular insertion hole 134A into which the fixing portion 111D of the arc tube 111 is inserted, and an adhesive 134C (see FIG. 4) formed continuously with the insertion hole 134A and made of cement or the like. Two substantially fan-shaped adhesive filling holes 13 to be formed
4B. Here, the insertion hole 134A and the adhesive filling hole 134B are formed continuously in a direction substantially orthogonal to the direction in which the arc tube 111 is inserted into the insertion hole 134A. Further, the two adhesive filling holes 134B are opposed to each other with the insertion hole 134A interposed therebetween.

In the light source lamp holding portion 133, two substantially fan-shaped air circulation holes 135 are formed near the insertion hole 134A of the holding hole 134. These two air holes 135 are opposed to each other with the insertion hole 134A interposed therebetween, like the two adhesive filling holes 134B.
Unlike the adhesive filling hole 134B, it is not continuous with the insertion hole 134A. By forming the air circulation hole 135 near the insertion hole 134A in which the arc tube 111 is held, the flow of the cooling air around the fixing portion 111D of the arc tube 111 is improved. That is, since an air flow passage can be formed around the fixed portion 111D of the arc tube 111, the fixed portion 111D can be efficiently cooled.

Next, the light source lamp 11 in the present embodiment
A method of fixing the lamp unit and the reflector 12 and a method of assembling the lamp unit 10 using the fixing method will be described. First, the protective glass plate 14 is attached to the reflector holder 132 of the lamp housing 13 by bonding or the like. Next, the reflector 12 is arranged so that its opening faces the protective glass plate 14, and the reflector 12 and the reflector holding portion 13 are arranged.
2 and the clip 15
Thus, the reflector 12 is fixed to the reflector holding portion 132. In addition, the protective glass plate 14 is
32, the protective glass plate 14 is attached to the main body 132 of the reflector holder 132 by the clip 15.
The protective glass plate 14 may be fixed to the reflector holding part 132 by holding it between the A and the flange 122 of the reflector 12. After attaching the protective glass plate 14 and the reflector 12 to the lamp housing 13,
The light source lamp 11 is inserted into the insertion hole 13 of the light source lamp holder 133.
4A, and is sequentially inserted into the insertion hole 12A of the reflector 12.
Then, the center point of light emission of the light source lamp 11 is set to the reflector 1
After positioning the light source lamp 11 with respect to the reflector 12 in accordance with the focal position of the second light source 2, the light source lamp holding unit 13
An adhesive 134C is filled in the adhesive filling hole 134B of No. 3 to fix the light source lamp 11 to the light source lamp holding portion 133.

According to the above-described embodiment, the following effects can be obtained. (1) In the lamp unit 10, since the light source lamp 11 and the reflector 12 are fixed to the lamp housing 13 independently of each other, a mounting portion for mounting and fixing the light source lamp 11 is formed on the reflector 12, which is an optical component. You don't have to. Therefore, the shape of the reflector 12 can be simplified, the accuracy of the reflection surface 121 (particularly, the bottom portion of the reflection surface 121) can be easily improved, and the illuminance of the lamp unit 10 can be increased.

(2) Light source lamp 1 in lamp housing 13
1, the holding hole 134 having an optimal shape for supporting and fixing the light source lamp 11 can be easily formed regardless of the complexity of the shape, and the light source lamp 11 can be favorably supported. .

(3) In the light source lamp 11, the light emitting section 11
1A and a portion between the fixed portion 111D, that is, the light emitting portion 1
Since a portion that is arranged near 11A and easily rises in temperature during lighting is exposed to the outside of the reflector 12, heat can be easily released from the portion. This allows
Since the portion can be cooled, the temperature of the light emitting portion 111A is hardly increased, and the life of the light source lamp 11 can be extended. Further, since the cooling efficiency of the light source lamp 11 is improved, for example, the temperature control of the light source lamp 11 by a cooling function such as a cooling fan (not shown) of the projector 1 becomes easy, and the relighting property of the light source lamp 11 can be improved. .

(4) Since the light emitting side of the reflector 12 is covered with the protective glass plate 14, even if the arc tube 111 of the light source lamp 11 ruptures due to its life, the fragments can be prevented from scattering outside the reflector 12. .

(5) Since the protective glass plate 14 is composed of four small glass plates 141, when the temperature inside the reflector 12 rises due to the rise in the temperature of the light source lamp 11 during lighting, the protective glass plate 14 is subjected to thermal deformation. Cracking of the protective glass plate 14 can be prevented.

(6) Since the protective glass plate 14 is fixed or held on the reflector holding portion 132 of the lamp housing 13, the mounting work can be facilitated differently from the case where the protective glass plate 14 is mounted on the opening of the reflector 12. In particular, in the present embodiment, since the divided type protective glass plate 14 is used, the complicated work of attaching the small glass plates 141 one by one is involved. However, the workability is improved by attaching the small glass plates 141 to the lamp housing 13. .

(7) Since the light source lamp holding portion 133 of the lamp housing 13 is provided with the air circulation hole 135 forming an air flow path around the fixing portion 111D of the light source lamp 11, the fixing portion 111D can be cooled efficiently. , Light source lamp 1
1, the service life can be extended.

(8) The light source lamp 11 is held by the light source lamp holding portion 133 of the lamp housing 13 and the air flow hole 135 is provided in the light source lamp holding portion 133.
Is formed, the shape of the reflector 12 does not have to be complicated, and the formation of the air circulation hole 135 can be facilitated.

It should be noted that the present invention is not limited to the above embodiment, and modifications and improvements as long as the object of the present invention can be achieved are included in the present invention. For example,
In the embodiment, the fixing portion 11 of the light source lamp 11 is provided by providing the airflow hole 135 in the light source lamp holding portion 133.
Although the air flow passage is formed in the vicinity of 1D, such an air flow passage is not necessarily provided, and the case where it is not provided is also included in the present invention. However, the provision of the air flow passage allows the light source lamp 11 to be cooled more efficiently.

In the above embodiment, the protective glass plate 14 is fixed to the lamp housing 13, but may be fixed directly to the opening of the reflector as in the conventional case. Further, the protective glass plate 14 may be of a split type as in the above-described embodiment, or may be formed integrally. It should be noted that the split-type protective glass plate is not limited to one divided into four, but includes one divided into two, three, or five or more. In the above-described embodiment, the through holes 14A of the divided protective glass plate 14 are formed in a substantially circular shape. For example, one corner of each of the four small glass plates 141 is cut out in a triangular shape, and By combining the four small glass plates 141 such that the cutout portions are concentrated at the center, a substantially rectangular through hole 14A may be formed at the center of the protective glass plate 14. In such a case, the formation of the through-hole 14A in the protective glass plate 14 is facilitated, and the generation of a crack during the processing of the through-hole 14A can be prevented.

In the above embodiment, the protective glass plate 14 that covers the light exit side of the reflector 12 is provided. However, the lamp unit according to the present invention is not limited to this, and does not include the protective glass plate. You may.

In the above embodiment, the lamp housing 13 in which the base 131, the reflector holder 132, and the light source lamp holder 133 are integrally formed is used. However, the base 131, the reflector holder 132, and The split-type lamp housing in which the light source lamp holding portion 133 is formed of independent parts may be used.

By doing so, the light source lamp 11 is removed from the base 131 together with the light source lamp holder 133, and the reflector 12 is removed together with the reflector holder 132, so that the light source can be maintained even after the lamp unit 10 is assembled. The lamp 11 and the reflector 12 can be divided. When the light source lamp 11 has reached the end of its life, it is possible to replace only the light source lamp 11 by making it divisible. Further, in the light source lamp 11, the fixing portion 111D can be unnecessary, and in such a case, the one side portion 111C may be used as the fixing portion.

On the other hand, if the illuminance is unsatisfactory after assembling the lamp unit 10, first, one of the light source lamp 11 and the reflector 12, for example, the light source lamp 11 and the light source lamp holding part 133 together with the base unit 13
1 and a new light source lamp holder 133 is attached to the base 131. Next, the light source lamp holding unit 133
A new light source lamp 11 is inserted into the holding hole 134, and is positioned with respect to the reflector 12, and then fixed with cement or the like. By doing so, even after the lamp unit 10 is assembled, the light source lamp 11 and the reflector 12
Position adjustment (alignment adjustment) of
Illuminance can be improved by replacing one of the light source lamp 11 and the reflector 12. Therefore,
When the above-described problem occurs in the lamp unit 10, only one of the light source lamp 11 and the reflector 12 is attached to the base unit 1 together with the holding units 133 and 132.
It is economical since it is sufficient to remove the battery and replace it.

The projector of the present invention is not limited to a projector using a liquid crystal panel as a light modulation device. For example, a projector having a light modulation device using a plasma element or a micromirror, or a projector for reflecting incident light. One with a reflection type light modulation device that modulates and emits light, single plate type, two-sheet type,
Rear type can be adopted. In short, a projector that modulates a light beam emitted from a light source lamp in accordance with image information to form an optical image, and projects the optical image in an enlarged manner may appropriately determine the configuration and the like in implementation.

[0055]

According to the present invention, there is an effect that the accuracy of the reflector can be easily improved and the light source lamp can be supported in a good state.

[Brief description of the drawings]

FIG. 1 is a plan view schematically illustrating an optical system of a projector according to an embodiment of the invention.

FIG. 2 is a plan view showing a lamp unit in the embodiment.

FIG. 3 is a side view showing the lamp unit in the embodiment.

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2;

FIG. 5 is a front view showing a lamp unit in the embodiment.

FIG. 6 is a rear view showing the lamp unit in the embodiment.

FIG. 7 is an exploded perspective view showing the lamp unit in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Projector 10 Lamp unit 11 Light source lamp 12 Reflector 13 Lamp housing which is a fixing member 14 Protective glass plate which is a light transmitting member 111A Light emitting unit 111D Fixed unit 133 Light source lamp holding unit which is a holding unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) // F21Y 101: 00

Claims (8)

[Claims] 1. A light source lamp having a light emitting portion, a reflector in which a light emitting portion of the light source lamp is disposed and reflecting light emitted from the light emitting portion, and a fixing device to which the light source lamp and the reflector are fixed And a fixing unit for fixing the light source lamp and the reflector independently of each other to the fixing member, and fixing the light source lamp to the fixing member of the light source lamp. And a portion between the light emitting portion and the light emitting portion is exposed to the outside of the reflector. 2. The lamp unit according to claim 1, wherein a light transmitting member for protection is provided on a light emitting side of the reflector. 3. The lamp unit according to claim 2, wherein the light transmitting member is divided into a plurality of light transmitting members. 4. The lamp unit according to claim 2, wherein the light transmitting member is fixed to the fixing member. 5. The lamp unit according to claim 1, wherein the holding portion of the fixing member, to which the fixing portion of the light source lamp is fixed and held, passes through the holding portion. A lamp unit having an air flow passage formed therein. 6. A projector comprising the lamp unit according to claim 1. Description: 7. A step of fixing any one of a light source lamp that emits a light beam and a reflector that reflects a light beam from the light source lamp to a fixing member, wherein the light source lamp and the reflector A method for fixing a light source lamp and a reflector, comprising: a step of positioning the other with respect to the one; and a step of fixing the other to the fixing member in a state independent of the one. . 8. A method of assembling a lamp unit comprising: a light source lamp that emits a light beam; and a reflector that reflects a light beam from the light source lamp, wherein the other of the light source lamp and the reflector is the other of the light source lamp and the reflector. A method of assembling a lamp unit, comprising: a step of positioning with respect to one; and a step of fixing the other to the fixing member in a state independent of the one.