JP2010108741A - Manufacturing method of secondary mirror, light source device, and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a secondary mirror for manufacturing a secondary mirror which is used for a light source capable of realizing thinness, without deteriorating the luminance and further, has high shock resistance. <P>SOLUTION: The manufacturing method of the secondary mirror includes, in the order starting from a tube member preparing process to prepare a tube member 50, having an inner diameter size corresponding to the inside diameter of a fixing part; an expansion portion forming process in which after heating and putting the tube member 50 in a molding die, the tube member 50 is rotated and applied with an internal pressure by an inert gas to expand a part of the tube member 50 so that a part of internal surface shape of the tube member 50 becomes a shape that corresponds to a reflected surface of the reflection part, and an expansion portion 52 and a pair of tube portions 50a, 50b located on both the sides of the expansion portion 52 are formed; a secondary mirror base forming process in which, by applying a prescribed cutting process on the tube member 50, after being subjected to an expansion portion forming process; secondary mirror bases 58, having an outer profile corresponding to the secondary mirror are formed; and a reflecting layer forming process, in which a reflecting layer 60 is formed on the portion that serves as the reflecting surface from among the secondary mirror bases 58. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a secondary mirror, a light source device, and a projector.

Conventionally, a light source device used for a projector is known (for example, see Patent Document 1).
In a conventional light source device, a shape in which an end portion on one side is deleted when the tube is cut along a predetermined plane including a rotation center axis and an arc tube having a tube bulb portion and a pair of sealing portions that enclose the light emitting portion And a reflector that reflects the light emitted from the light emitting part to the illuminated area side, and a reflection that reflects the light emitted from the light emitting part toward the light emitting part. And a secondary mirror having a portion. The secondary mirror is disposed on one side of one of the pair of sealing portions, and further includes a fixing portion for fixing the secondary mirror to the sealing portion. The fixing part is fixed to the sealing part by an adhesive, and the arc tube is fixed to the reflector by the adhesive.

  For this reason, according to the conventional light source device, one end of the reflector is deleted to reduce the thickness, while a secondary mirror is disposed so as to cover one side of the bulb portion and the light is emitted from the light emitting portion. Since light is used effectively, it is possible to reduce the thickness without reducing the luminance. Further, by providing such a light source device, it is possible to manufacture a high-brightness and thin projector.

JP2007-335196A

  However, according to the investigation by the inventors of the present invention, it has been found that the conventional light source device has a problem that the secondary mirror is easily dropped from the sealing portion and the impact resistance is low.

  Therefore, the present invention has been made to solve such a problem, and it is possible to reduce the thickness without reducing the luminance, and to provide a light source device having high impact resistance. With the goal. It is another object of the present invention to provide a projector that has such a light source device and has high brightness, a thin shape, and high impact resistance. Moreover, it aims at providing the manufacturing method of the secondary mirror for manufacturing the secondary mirror used for the above light source devices.

  When the secondary mirror manufacturing method according to the present invention is cut along a predetermined plane including a tube bulb portion including a light emitting portion and a pair of sealing portions, and a predetermined plane including a rotation center axis, at least an end portion on one side is A reflector having a deleted shape and reflecting the light emitted from the light emitting portion toward the illuminated area, and arranged to cover the one side of the tube portion, and the light emitted from the light emitting portion A secondary mirror having a reflective part that reflects toward the light emitting part, and the secondary mirror further has a fixing part for fixing the secondary mirror to the sealing part with an adhesive, and the fixing part is The method of manufacturing a secondary mirror in a light source device configured to cover the outer periphery of one sealing portion of the pair of sealing portions beyond a half circumference, the inner diameter dimension corresponding to the inner diameter of the fixed portion A tubular member preparing step of preparing a tubular member having the structure, and the tubular portion Is heated and placed in the mold, and an internal pressure is applied by an inert gas while rotating the tubular member so that a part of the inner surface of the tubular member has a shape corresponding to the reflecting surface of the reflecting portion. In this way, a part of the tubular member is inflated to form an inflatable part and a pair of tubular parts located on both sides of the inflatable part, and the like. Cutting process to form a secondary mirror base material having an outer shape corresponding to the secondary mirror, and a reflective layer to be formed on the reflective surface portion of the secondary mirror base material And a layer forming step in this order.

  For this reason, according to the manufacturing method of the secondary mirror of the present invention, “the one side of the reflector is deleted to reduce the thickness, while the secondary mirror is disposed so as to cover one side of the tube portion. Since the light emitted from the light emitting part can be used effectively, it is possible to reduce the thickness without lowering the brightness, and further, the outer periphery of the sealing part is configured to cover more than a half circumference. Since the secondary mirror can be strongly fixed to the arc tube with a large bonding area so as to cover the sealing portion, the secondary mirror is difficult to drop off from the sealing portion, and the It is possible to manufacture a secondary mirror used in a “light source device with high impact”.

  Further, according to the method for manufacturing a secondary mirror of the present invention, since the secondary mirror is manufactured by a so-called atmospheric pressure molding method, a mold for forming the reflecting surface of the secondary mirror is not necessary. For this reason, even if the continuous production quantity of the secondary mirror is increased, the surface of the molding die is not worn, and the secondary mirror material does not adhere to the surface of the molding die. Therefore, the characteristics of the reflecting surface of the secondary mirror to be manufactured are not deteriorated, so that the light use efficiency is not reduced and the manufacturing cost is not increased. In addition, according to the method for manufacturing a secondary mirror of the present invention, the inner surface of the tubular member is in contact with only the inert gas, so that a smooth reflective surface with extremely small surface roughness can be obtained as the reflective surface of the secondary mirror. it can. As a result, according to the method for manufacturing a secondary mirror of the present invention, it is possible to manufacture an inexpensive secondary mirror that is excellent in surface roughness and light utilization efficiency.

  In the secondary mirror manufacturing method of the present invention, when the inflating part of the tubular member that has undergone the inflating part forming process is viewed from a direction orthogonal to the axis of the tubular member, the front side portion of the inflating part is the front side. When it is an inflating part, and the back side part of the inflating part is a back side inflating part, the cutting process includes a front side predetermined region including the front side inflating part in the tubular member and a back side including the back side inflating part in the tubular member. A first cutting step for making a first cut along the longitudinal direction of the tubular member in each of the predetermined regions, and a first predetermined position in one tubular portion of the pair of tubular portions into the predetermined region on the front side A second cutting step for making a second cut so as to reach the first cut made and the first cut made in the backside predetermined region, and the other tubular portion of the pair of tubular portions It is a fixed position, and the first predetermined position is a first notch put in the front-side predetermined area and a back-side predetermined area from a second predetermined position that is 180 ° apart in the circumferential direction of the tubular member. A third cutting step for making a third cut so as to reach one cut, and a fourth cut for cutting the end of the one tubular portion to form the fixing portion in the one tubular portion. It is preferable to form the secondary mirror base material including the fixing part on the one tubular part side.

  By adopting such a method, it is possible to reliably form the sub-mirror substrate having a relatively complicated structure as described above by performing the four cutting processes.

  In the secondary mirror manufacturing method of the present invention, in at least one of the second cutting process and the third cutting process, an oblique cut is made so as to approach the expanding portion as the cut is made deeper. Is preferred.

  By adopting such a method, the length along the longitudinal direction of the sealing portion in the fixed portion of the manufactured secondary mirror is gradually shortened from one side to the other side. It is possible to fix the secondary mirror to the arc tube without hindering the emitted light as much as possible.

  In the method for manufacturing a secondary mirror according to the present invention, the cutting step includes a first cut in the front-side predetermined region and a back-side predetermined region from a third predetermined position in the other tubular portion. A fifth cutting step of making a fifth cut so as to reach one cut, and a fourth position which is a predetermined position in the one tubular portion and is separated from the third predetermined position by 180 ° in the circumferential direction of the tubular member. A sixth cutting process step for inserting a sixth cut so as to reach a first cut made in the front-side predetermined region and a first cut made in the back-side predetermined region from a predetermined position; and in the other tubular portion And a seventh cutting step of forming a fixing portion on the other tubular portion by cutting a seventh notch so as to cut off an end portion, and having the fixing portion on the one tubular portion side In addition to the secondary mirror substrate, it is preferable to also form the secondary mirror substrate having the fixed portion to the other tubular portion.

  By adopting such a method, it becomes possible to form two secondary mirror base materials from one tubular member, and therefore it becomes possible to manufacture a further inexpensive secondary mirror.

  In the secondary mirror manufacturing method of the present invention, in at least one of the fifth cutting process and the sixth cutting process, the cutting may be performed obliquely so as to approach the expanding portion as the cutting is made deeper. preferable.

  By adopting such a method, the length along the longitudinal direction of the sealing portion in the fixing portion of the manufactured secondary mirror is also gradually shortened from one side to the other side with respect to the second secondary mirror. Therefore, it becomes possible to fix the secondary mirror to the arc tube without hindering the light emitted from the light emitting part to the reflector as much as possible.

  In the secondary mirror manufacturing method of the present invention, it is preferable to perform the cutting process using a slicer.

  By adopting such a method, it becomes possible to manufacture the secondary mirror without using an expensive wire cut or the like, and therefore it becomes possible to manufacture a cheaper secondary mirror.

  When the light source device of the present invention is cut along a predetermined plane including a tube bulb portion including a light emitting portion and a pair of sealing portions, and a predetermined plane including a rotation center axis, at least an end portion on one side is deleted. A reflector having a shape and reflecting light emitted from the light emitting part toward the illuminated region side, and arranged to cover the one side of the tube part, and emitting light from the light emitting part to the light emitting part A secondary mirror having a reflecting portion that reflects toward the screen, and the secondary mirror further includes a fixing portion for fixing the secondary mirror to the sealing portion with an adhesive, and the fixing portion includes the pair of mirrors. A light source device configured to cover the outer periphery of one of the sealing portions over a half circumference, wherein the secondary mirror is manufactured by the secondary mirror manufacturing method of the present invention. It is characterized by being.

  For this reason, according to the light source device of the present invention, one end of the reflector is deleted to reduce the thickness, while a secondary mirror is disposed so as to cover one side of the bulb portion, and from the light emitting portion. Since it is possible to effectively use the emitted light, it is possible to reduce the thickness without reducing the brightness, and furthermore, the fixing is configured to cover the outer periphery of the sealing portion beyond the half circumference. Therefore, the secondary mirror can be strongly fixed to the arc tube with a large bonding area so as to cover the sealing portion. As a result, it is difficult for the secondary mirror to drop off from the sealing portion, and the impact resistance can be increased. That is, the light source device of the present invention can be reduced in thickness without lowering the luminance, and further becomes a light source device with high impact resistance.

  The projector of the present invention projects an illumination device having the light source device of the present invention, an electro-optic modulation device that modulates illumination light from the illumination device according to an information image, and modulated light from the electro-optic modulation device. And a projection lens.

  For this reason, the projector according to the present invention can be thinned without lowering the luminance. Further, since the light source device according to the present invention having high impact resistance is provided, the projector is high in luminance and thin, and further, It becomes a projector with high impact resistance.

  Hereinafter, a method for manufacturing a secondary mirror, a light source device, and a projector according to the present invention will be described based on embodiments shown in the drawings.

[Embodiment 1]

1. Configuration of Light Source Device FIG. 1 is a diagram illustrating a light source device 10 according to the first embodiment. 1A is a perspective view of the light source device 10, and FIG. 1B is a longitudinal sectional view of the light source device 10.
FIG. 2 is a view for explaining the secondary mirror 40 in the light source device 10 according to the first embodiment. 2A is a perspective view of the secondary mirror 40, FIG. 2B is a longitudinal sectional view of the secondary mirror 40, and FIG. 2C shows the secondary mirror 40 fixed to the arc tube 20. FIG.

  As illustrated in FIG. 1, the light source device 10 according to the first embodiment includes a light emitting tube 20 having a tube portion 22 and a pair of sealing portions 24 and 26 that contain a light emitting portion 28, and a predetermined center including a rotation center axis 30 ax. And a reflector 30 that reflects the light L1 emitted from the light emitting part 28 toward the illuminated area side, and one of the tube part 22 And a secondary mirror 40 having a reflecting portion 42 that is disposed so as to cover the side and reflects the light L2 emitted from the light emitting portion 28 toward the light emitting portion 28.

  As shown in FIGS. 1 and 2, the secondary mirror 40 further includes a fixing portion 44 for fixing the secondary mirror 40 to the sealing portion 24. The fixing portion 44 is fixed to the sealing portion 24 with cement c. The fixing portion 44 is fixed to the reflector 30 with cement c. The fixing portion 44 is configured to cover the entire outer periphery of the sealing portion 24. Further, as shown in FIG. 2C, the fixing portion 44 has a length B along the longitudinal direction A of the sealing portion 24 in the fixing portion 44 that gradually decreases from one side to the other side. It is configured. An angle formed by a straight line 45c connecting the base end portion 45a and the tip end portion 45b of the fixing portion 44 and an axis along the longitudinal direction A of the arc tube 20 is, for example, 45 °.

  The inner surface of the reflecting portion 42 has an aspherical shape, and is configured such that the light L <b> 2 reflected by the reflecting portion 42 is reflected toward the light emitting portion 28. The reflector 30 has, for example, a spheroidal reflecting surface. The material of the secondary mirror 40 is, for example, quartz glass.

2. Manufacturing method of light source device In the manufacturing method of the light source device, the arc tube 20, the reflector 30 and the secondary mirror 40 are prepared in advance, and after fixing the secondary mirror 40 to the luminous tube 20, first, the secondary mirror 40 is fixed. The arc tube 20 is fixed to the reflector 30 at the portion 44. Among these, since the manufacturing method of the arc tube 20 and the reflector 30 is well known, the manufacturing method of the secondary mirror 40 is demonstrated in detail here.

3. Method for Manufacturing Secondary Mirror FIG. 3 is a view for explaining the method for manufacturing the secondary mirror according to the first embodiment. FIG. 3A to FIG. 3G are process diagrams. In the actual process, a margin for cutting is generated, but the illustration is omitted in FIG. In FIG. 3, one side and the other side when the secondary mirror 40 is incorporated in the light source device 10 are shown.

(1) Tubular member preparation step First, a tubular member 50 having an inner diameter corresponding to the inner diameter of the fixing portion 44 (see FIG. 3G) is prepared (see FIG. 3A). As the material of the tubular member 50, hard glass or quartz glass can be suitably used. Among these, it is more preferable to use quartz glass. This is because quartz glass has a low coefficient of thermal expansion and no internal strain, so that it is not necessary to perform an annealing process.

(2) Forming Step for Expanding Part Next, after the tubular member 50 is heated and placed in a mold (not shown), the shape of a part of the inner surface of the tubular member 50 corresponds to the reflecting surface of the reflecting part 42 The tubular member 50 is rotated so as to apply an internal pressure with an inert gas so as to expand a part of the tubular member 50, and the pair of tubular portions 50a located on both sides of the expanded portion 52, 50b is formed (see FIG. 3B). As the inert gas, for example, argon gas or nitrogen gas can be suitably used.

(3) Cutting process Next, the secondary mirror 40 is subjected to a predetermined cutting process (refer to the following first cutting process to fourth cutting process) on the tubular member 50 that has undergone the forming process of the expansion portion and the like. A secondary mirror substrate 58 having a corresponding outer shape is formed.

(3-1) 1st cutting process In addition, in the following description, when the expansion part 52 of the tubular member 50 which passed through the expansion part etc. formation processes is seen from the direction orthogonal to the axis | shaft of the tubular member 50, the expansion part 52 is shown. The front side portion is the front side inflating portion, and the back side portion of the inflating portion 52 is the back side inflating portion.
First, using the slicer, the longitudinal direction of the tubular member 50 is set in each of the front-side predetermined region R1 including the front-side expanded portion in the tubular member 50 and the back-side predetermined region R1 (not shown) including the back-side expanded portion in the tubular member 50. A first cut X1 is made along the axis 50ax of the tubular member (see FIG. 3C). At this time, the first cut X1 is made so that the length from the center point X1c of the expansion part to the target point X1a is equal to the length from the center point X1c of the expansion part to the target point X1d.

(3-2) Second cutting process step Next, using a slicer, the first cut made in the front-side predetermined region from the first predetermined position P1 in one tubular portion 50a of the pair of tubular portions 50a, 50b. The second cut X2 is made so as to reach X1 and the first cut X1 put in the predetermined area on the back side (see FIG. 3D). The second cut X2 is cut obliquely (45 °) so as to approach the expansion portion 52 as the cut is made deeper.

(3-3) Third Cutting Process Next, using a slicer, a predetermined position in the other tubular portion 50b of the pair of tubular portions 50a and 50b, and the first predetermined position P1 is the circumference of the tubular member 50. The third cut X3 is made so as to reach the first cut X1 put in the front-side predetermined region and the first cut X1 put in the back-side predetermined region from the second predetermined position P2 that is 180 ° apart in the direction (FIG. 3). (See (e).) In addition, since the tubular member 50 will be isolate | separated into the two cut pieces 54a and 54b after the 3rd cutting process process is complete | finished, a cutting process will be performed with respect to the cut piece 54a after this.

(3-4) Fourth Cutting Process Step Next, using a slicer, the fourth cut X4 is made so as to cut off the end portion 56a of the one tubular portion 50a, and the fixed portion 44 is formed in the one tubular portion 50a. (See FIG. 3 (f)). When the cutting process is completed, the secondary mirror base material 58 is completed.

(4) Reflective layer formation process Next, the reflective layer 60 is formed in the part used as a reflective surface among the submirror base materials 58 (refer FIG.3 (g)). As the reflective layer 60, for example, a reflective layer made of a dielectric multilayer film of tantalum oxide (Ta ₂ O ₅ ) and silicon oxide (SiO ₂ ) can be suitably used. When the reflection layer forming step is completed, the secondary mirror 40 is completed.

3. Configuration of Projector FIG. 4 is a diagram illustrating an optical system of the projector 1000 according to the first embodiment.
FIG. 5 is a view for explaining the lighting device 100. FIG. 5A is a longitudinal sectional view of the lighting device 100, and FIG. 5B is a transverse sectional view of the lighting device 100.

  As shown in FIG. 4, the projector 1000 according to the first embodiment separates the illumination device 100 and the illumination light flux from the illumination device 100 into three color lights of red light, green light, and blue light and guides them to the illumination area. The three color liquid crystal devices 400R, 400G, and 400B as electro-optic modulation devices that modulate the light-separated color separation light guide optical system 200 and the three color lights separated by the color separation light guide optical system 200 according to image information. A cross dichroic prism 500 that combines the color lights modulated by the three liquid crystal devices 400R, 400G, and 400B, and a projection optical system 600 that projects the light combined by the cross dichroic prism 500 onto a projection surface such as a screen SCR. It is a projector provided with.

  As shown in FIGS. 4 and 5, the illuminating device 100 includes a light source device 10 that emits an illuminating light beam toward the illuminated region, a concave lens 90 that emits focused light from the light source device 10 as substantially parallel light, and a concave lens 90. The first lens array 120 having a plurality of first small lenses 122 for dividing the illumination light beam emitted from the first partial light beam into a plurality of partial light beams, and a plurality of first lens elements corresponding to the plurality of first small lenses of the first lens array 120. A second lens array 130 having two small lenses 132, a polarization conversion element 140 that converts each partial light beam from the second lens array 130 into substantially one type of linearly polarized light having a uniform polarization direction, and emits the polarized light, and polarization conversion And a superimposing lens 150 for superimposing the partial light beams emitted from the element 140 in the illuminated area.

  As shown in FIGS. 4 and 5, the light source device 10 according to the first embodiment includes a reflector 30 having a spheroidal reflection surface as a reflector, an arc tube 20 having a light emission center near the first focal point of the reflector 30, and And a secondary mirror 40 as a reflecting means. The secondary mirror 40 is manufactured by the secondary mirror manufacturing method of the present invention. The light source device 10 emits a light beam having the illumination optical axis 100ax as a central axis.

  As shown in FIG. 5, the arc tube 20 includes a bulb portion 22 containing a pair of electrodes arranged along the illumination optical axis 100ax, and a pair of sealing portions 24 and 26 extending on both sides of the bulb portion 22. And a pair of metal foils sealed in the pair of sealing portions 24 and 26, respectively, and a pair of lead wires electrically connected to the pair of metal foils. And the outer surface of the tube part 22 and the outer surface of a pair of sealing parts 24 and 26 are connected smoothly. When a voltage is applied to the lead wire, a potential difference is generated between the pair of electrodes, discharge occurs, and an arc image is generated. This arc image is a light emitting part.

In addition, when the conditions of the components of the arc tube 20 are exemplarily shown, the tube portion 22 and the sealing portions 24 and 26 are made of, for example, quartz glass, and mercury or a rare gas is contained in the tube portion 22. And a small amount of halogen is enclosed. The electrode is, for example, a tungsten electrode, and the metal foil is, for example, a molybdenum foil. The lead wire is made of, for example, molybdenum or tungsten.
Further, as the arc tube 20, various arc tubes that emit light with high luminance can be employed, for example, a high pressure mercury lamp, an ultra high pressure mercury lamp, a metal halide lamp, or the like.

  As shown in FIG. 5, the reflector 30 includes an opening for inserting and fixing the sealing portion 24 of the arc tube 20, and a reflective surface that reflects light emitted from the arc tube 20 toward the second focal position. And have. The reflector 30 is fixed to the sealing portion 24 of the arc tube 20 and the fixing portion 44 of the secondary mirror 40 with cement c filled in the opening of the reflector 30.

For example, crystallized glass, alumina (Al ₂ O ₃ ), or the like can be suitably used as the material for the base material constituting the reflecting surface. On the inner surface of the reflecting surface, for example, a visible light reflecting layer made of a dielectric multilayer film of titanium oxide (TiO ₂ ) and silicon oxide (SiO ₂ ) is formed.

  As described above, the secondary mirror 40 is disposed so as to cover one side of the tube portion 22, and includes a reflective portion 42 that reflects the light L 2 emitted from the light emitting portion 28 toward the light emitting portion 28, and the secondary mirror 40. And a fixing portion 44 for fixing the mirror 40 to the sealing portion 24. The secondary mirror 40 is manufactured by the above-described secondary mirror manufacturing method.

  As shown in FIG. 5, the concave lens 90 is disposed on the illuminated region side of the reflector 30. The light from the reflector 30 is emitted toward the first lens array 120.

  The first lens array 120 has a function as a light beam splitting optical element that splits light from the concave lens 90 into a plurality of partial light beams, and a plurality of first lens arrays 120 arranged in a matrix in a plane orthogonal to the illumination optical axis 100ax. It has a configuration provided with one small lens 122. Although not illustrated, the outer shape of the first small lens 122 is similar to the outer shape of the image forming area of the liquid crystal devices 400R, 400G, and 400B.

  The second lens array 130 is an optical element that collects a plurality of partial light beams divided by the first lens array 120 described above, and in the same manner as the first lens array 120, a matrix is formed in a plane orthogonal to the illumination optical axis 100ax. And a plurality of second small lenses 132 arranged in a shape.

The polarization conversion element 140 is a polarization conversion element that emits the polarization direction of each partial light beam divided by the first lens array 120 as approximately one type of linearly polarized light having a uniform polarization direction.
The polarization conversion element 140 transmits one linear polarization component of the polarization component included in the illumination light beam from the light source device 10 as it is, and reflects the other linear polarization component in a direction perpendicular to the illumination optical axis 100ax. And the other linearly polarized light component reflected by the polarization separation layer in a direction parallel to the illumination optical axis 100ax, and the other linearly polarized light component reflected by the reflective layer is converted into one linearly polarized light component. And a retardation plate.

  The superimposing lens 150 condenses a plurality of partial light beams that have passed through the first lens array 120, the second lens array 130, and the polarization conversion element 140, and superimposes them on the vicinity of the image forming regions of the liquid crystal devices 400R, 400G, and 400B. It is an element. In addition, although the superimposing lens 150 shown in FIG. 4 is comprised by one lens, you may be comprised by the compound lens which combined several lenses.

  As shown in FIG. 4, the color separation light guide optical system 200 includes dichroic mirrors 210 and 220, reflection mirrors 230, 240 and 250, an incident side lens 260, and a relay lens 270. The color separation light guide optical system 200 separates the illumination light beam emitted from the illumination device 100 into three color lights of red light, green light, and blue light, and the respective color lights are liquid crystal devices 400R, 400G, and 400 to be illuminated. It has a function of leading to 400B.

  The dichroic mirrors 210 and 220 are optical elements on which a wavelength selection film that reflects a light beam in a predetermined wavelength region and transmits a light beam in another wavelength region is formed on a substrate. The dichroic mirror 210 disposed in the front stage of the optical path is a mirror that reflects a red light component and transmits other color light components. The dichroic mirror 220 disposed in the latter stage of the optical path is a mirror that reflects the green light component and transmits the blue light component.

  The red light component reflected by the dichroic mirror 210 is bent by the reflection mirror 230 and enters the image forming area of the liquid crystal device 400R for red light through the condenser lens 300R.

  The condenser lens 300R is provided to convert each partial light beam from the superimposing lens 150 into a light beam substantially parallel to each principal ray. The condensing lenses 300G and 300B disposed in the preceding stage of the optical path of the other liquid crystal devices 400G and 400B are configured in the same manner as the condensing lens 300R.

Of the green light component and the blue light component that have passed through the dichroic mirror 210, the green light component is reflected by the dichroic mirror 220, passes through the condenser lens 300G, and enters the image forming region of the green light liquid crystal device 400G. On the other hand, the blue light component is transmitted through the dichroic mirror 220, passes through the incident side lens 260, the incident side reflection mirror 240, the relay lens 270, the emission side reflection mirror 250, and the condensing lens 300B, and is a liquid crystal for blue light. The light enters the image forming area of the apparatus 400B. The incident side lens 260, the relay lens 270, and the reflection mirrors 240 and 250 have a function of guiding the blue light component transmitted through the dichroic mirror 220 to the liquid crystal device 400B.

  The reason that the incident side lens 260, the relay lens 270, and the reflection mirrors 240 and 250 are provided in the optical path of blue light is that the length of the optical path of blue light is longer than the length of the optical paths of other color lights. For this reason, a decrease in light use efficiency due to light divergence or the like is prevented. The projector 1000 according to Embodiment 1 has such a configuration because the length of the optical path of blue light is long. However, the length of the optical path of red light is increased, and the incident side lens 260 and the relay lens 270 are configured. And the structure which uses the reflective mirrors 240 and 250 for the optical path of red light is also considered.

The liquid crystal devices 400 </ b> R, 400 </ b> G, and 400 </ b> B modulate the incident illumination light beam according to image information, and are the illumination target of the illumination device 100. Although not shown, incident side polarizing plates are arranged between the condenser lenses 300R, 300G, and 300B and the liquid crystal devices 400R, 400G, and 400B, respectively, and the liquid crystal devices 400R, 400G, and 400B, Between the cross dichroic prism 500, an exit-side polarizing plate is disposed. The incident-side polarizing plate, the liquid crystal devices 400R, 400G, and 400B and the exit-side polarizing plate modulate light of each incident color light.
The liquid crystal devices 400R, 400G, and 400B are a pair of transparent glass substrates in which a liquid crystal that is an electro-optical material is hermetically sealed. For example, a polysilicon TFT is used as a switching element and incident according to a given image signal. Modulates the polarization direction of one type of linearly polarized light emitted from the side polarizing plate.

  The cross dichroic prism 500 is an optical element that forms a color image by synthesizing an optical image modulated for each color light emitted from the emission side polarizing plate. The cross dichroic prism 500 has a substantially square shape in plan view in which four right-angle prisms are bonded together, and a dielectric multilayer film is formed on a substantially X-shaped interface in which the right-angle prisms are bonded together. The dielectric multilayer film formed at one of the substantially X-shaped interfaces reflects red light, and the dielectric multilayer film formed at the other interface reflects blue light. By these dielectric multilayer films, the red light and the blue light are bent and aligned with the traveling direction of the green light, so that the three color lights are synthesized.

  The color image emitted from the cross dichroic prism 500 is enlarged and projected by the projection optical system 600 to form an image on the screen SCR.

  Thus, as described above, the method for manufacturing the secondary mirror according to the first embodiment includes the tubular member preparation step, the expanding portion forming step, the cutting step, and the reflective layer forming step in this order. It is a manufacturing method of a secondary mirror. In addition, the light source device 10 according to the first embodiment is a light source device including the arc tube 20, the reflector 30, and the sub mirror 40 as described above. Furthermore, the projector 1000 according to the first embodiment is a projector including the illumination device 100 including the light source device 10 according to the first embodiment.

  For this reason, according to the manufacturing method of the secondary mirror according to the first embodiment, “the end 30z on one side of the reflector 30 is deleted to reduce the thickness, while the secondary side is covered so as to cover one side of the tube portion 22. Since the mirror 40 can be disposed to effectively use the light emitted from the light emitting unit 28, it is possible to reduce the thickness without reducing the luminance. Since the fixing portion 44 configured to cover more than half a circumference is provided, the secondary mirror 40 can be strongly fixed to the arc tube 20 with a large adhesion area so as to cover the sealing portion 24. It becomes difficult for the secondary mirror 40 to fall off from the stop portion 24, and it becomes possible to manufacture the secondary mirror used for the light source device 10 "having high impact resistance.

  Moreover, according to the manufacturing method of the submirror which concerns on Embodiment 1, since it is supposed that a submirror will be manufactured by what is called an atmospheric pressure forming method, the shaping | molding die for forming the reflective surface of a submirror will become unnecessary. For this reason, even if the continuous production quantity of the secondary mirror is increased, the surface of the molding die is not worn, and the secondary mirror material does not adhere to the surface of the molding die. Therefore, the characteristics of the reflecting surface of the secondary mirror to be manufactured are not deteriorated, so that the light use efficiency is not reduced and the manufacturing cost is not increased. Moreover, according to the manufacturing method of the secondary mirror which concerns on Embodiment 1, since the inner surface of the tubular member 50 contacts only an inert gas, a smooth reflective surface with very small surface roughness is used as the reflective surface of the secondary mirror. Obtainable. As a result, according to the manufacturing method of the secondary mirror according to the first embodiment, it is possible to manufacture an inexpensive secondary mirror that is excellent in surface roughness and light utilization efficiency.

  Moreover, according to the manufacturing method of the secondary mirror which concerns on Embodiment 1, it is possible to form reliably the secondary mirror base material which has a comparatively complicated structure as mentioned above by implementing four cutting processes. It becomes.

  Moreover, according to the manufacturing method of the secondary mirror which concerns on Embodiment 1, the length along the longitudinal direction of the sealing part 24 in the fixing | fixed part 44 of the manufactured secondary mirror 40 gradually goes from one side toward the other side. Therefore, the secondary mirror can be fixed to the arc tube without hindering the light emitted from the light emitting unit 28 to the reflector 30 as much as possible.

  Moreover, since it becomes possible to manufacture the secondary mirror 40 without using an expensive wire cut etc., it becomes possible to manufacture a further inexpensive secondary mirror.

  According to the light source device 10 according to the first embodiment, the one end of the reflector 30 is deleted to reduce the thickness, while the secondary mirror 40 is disposed so as to cover the one side of the tube portion 22 to emit light. Since the light emitted from the portion 28 can be effectively used, it is possible to reduce the thickness without lowering the luminance, and further to cover the outer periphery of the sealing portion 24 over a half circle. Since the fixing portion 44 is configured, the sub mirror 40 can be strongly fixed to the arc tube 20 with a large adhesion area so as to cover the sealing portion 24. As a result, the secondary mirror 40 is less likely to drop off from the sealing portion 24, and the impact resistance can be increased. That is, the light source device 10 according to the first embodiment can be thinned without lowering the luminance, and further becomes a light source device with high impact resistance.

  The projector 1000 according to the first embodiment can be reduced in thickness without lowering the luminance, and further includes the light source device 10 according to the first embodiment having high impact resistance. Becomes a projector with high impact resistance.

[Embodiment 2]
FIG. 6 is a view for explaining the method of manufacturing the secondary mirror according to the second embodiment. FIG. 6A to FIG. 6C are process diagrams. In the actual process, a margin for cutting is generated, but the illustration is omitted in FIG.

  The manufacturing method of the secondary mirror according to the second embodiment basically includes the same steps as the manufacturing method of the secondary mirror according to the first embodiment. However, the secondary mirror base material is formed in the cutting process. This is different from the manufacturing method of the secondary mirror of the first embodiment. Specifically, in the secondary mirror manufacturing method according to the second embodiment, as shown in FIG. 6, the fourth cutting step in the secondary mirror manufacturing method according to the first embodiment (see FIG. 3F). And the reflecting layer forming step (see FIG. 3G), the following fifth to seventh cutting steps are performed.

(3-5) Fifth Cutting Process Step First, the slicer is used to enter the front-side predetermined region from the third predetermined position P3 that is farther from the expansion portion 52 than the second predetermined position P2 in the other tubular portion 50b. The fifth notch X5 is made so as to reach the first notch X1 and the first notch X1 put in the predetermined area on the back side (see FIG. 6A). Further, the fifth cut X5 is made obliquely (45 °) so as to approach the expansion part 52 as the cut is made deeper, and is made toward the target point X1d that is symmetrical with the target point X1a with respect to the center of the expansion part 52. .

(3-6) Sixth Cutting Step Next, using a slicer, the predetermined position in one tubular portion 50a and the third predetermined position P3 is 180 ° apart in the circumferential direction of the tubular member 50, and the first predetermined position is obtained. From the fourth predetermined position P4 closer to the expansion portion 52 than the position P1, the sixth cut X6 is made so as to reach the first cut X1 put in the front-side predetermined area and the first cut X1 put in the back-side predetermined area. (See FIG. 6B.) The sixth cut X6 is made toward the target point X1e that is symmetrical to the target point X1b with the center of the expanding portion 52 as a reference.

(3-7) Seventh cutting step Next, using a slicer, the seventh cut X7 is made so as to cut off the end portion 56b of the other tubular portion 50b, and the fixing portion 44 is formed in the other tubular portion 50b. (See FIG. 6C.) When the cutting process is completed, in addition to the secondary mirror base material 58 having the fixing portion 44 on the one tubular portion 50a side, the second secondary mirror base material 58 having the fixing portion 44 on the other tubular portion 50b side is provided. Complete.

  For this reason, according to the manufacturing method of the secondary mirror which concerns on Embodiment 2, in addition to the effect which the manufacturing method of the secondary mirror which concerns on Embodiment 1 has, it has the following effects. That is, since the two secondary mirror base materials are formed in the cutting process, it is possible to form two secondary mirror base materials from one tubular member, and it is possible to manufacture an inexpensive secondary mirror. It becomes possible. Also, for the second secondary mirror base material, the length along the longitudinal direction of the sealing portion in the fixed portion of the secondary mirror manufactured gradually decreases from one side to the other side, It is possible to manufacture a secondary mirror that can take a large adhesion area without hindering the light emitted from the light emitting portion to the reflector as much as possible, and further reducing the cost.

[Embodiment 3]
FIG. 7 is a view for explaining the method of manufacturing the secondary mirror according to the third embodiment. Fig.7 (a)-FIG.7 (c) are each process drawing. In the actual process, a margin for cutting is generated, but the illustration is omitted in FIG.

  The manufacturing method of the secondary mirror according to Embodiment 3 basically includes the same steps as the manufacturing method of the secondary mirror according to Embodiment 1, but the contents of the third cutting process are the same as those of the secondary mirror of Embodiment 1. This is different from the manufacturing method. Specifically, in the secondary mirror manufacturing method according to the third embodiment, instead of the third cutting step (see FIG. 3E) in the secondary mirror manufacturing method according to the first embodiment, the following Three cutting steps (see FIG. 7A) are to be performed.

(3-3) Third Cutting Process Step Using a slicer, a predetermined position in the other tubular portion 50b of the pair of tubular portions 50a and 50b, and the first predetermined position P1 is 180 in the circumferential direction of the tubular member 50. A third notch X3a is made so as to reach the first notch X1 placed in the front-side prescribed region and the first notch X1 placed in the back-side prescribed region from the second prescribed position P2a that is separated by [°] (FIG. 7A). reference.). The second predetermined position P2a is a position symmetrical to the first predetermined position with respect to the center of the inflating portion 52. When the third cutting process is completed, the tubular member 50 is separated into two cut pieces 54c, and thereafter, the fourth cut process is performed on the two cut pieces 54c (see FIG. 7B). A reflective layer forming step (see FIG. 7C) is performed.

  For this reason, according to the manufacturing method of the secondary mirror which concerns on Embodiment 3, in addition to the effect which the manufacturing method of the secondary mirror which concerns on Embodiment 1 has, there exist the following effects. That is, the method for manufacturing the secondary mirror according to the third embodiment includes the third cutting process as described above in place of the third cutting process in the method for manufacturing the secondary mirror according to the first embodiment. It is possible to obtain two secondary mirror base materials from one tubular member without making it possible to form two secondary mirror base materials from one tubular member, and to manufacture an inexpensive secondary mirror. Is possible. In addition, according to the method for manufacturing the secondary mirror according to the third embodiment, the secondary mirror 40a having the extending portion 48 can be manufactured. For this reason, it is possible to fix the arc tube and the secondary mirror also in the extending portion 48, and it is possible to manufacture a light source device with higher impact resistance.

[Embodiment 4]
FIG. 8 is a diagram for explaining the method of manufacturing the secondary mirror according to the fourth embodiment. FIG. 8A to FIG. 8D are process diagrams. In the actual process, a margin for cutting is generated, but the illustration is omitted in FIG.

  The manufacturing method of the secondary mirror according to the fourth embodiment basically includes the same steps as the manufacturing method of the secondary mirror according to the first embodiment, but the content of the second cutting process is the same as that of the secondary mirror of the first embodiment. This is different from the manufacturing method. Specifically, in the method for manufacturing the secondary mirror according to the fourth embodiment, the second cutting process (see FIG. 3D) in the method for manufacturing the secondary mirror according to the first embodiment is performed as described below. Two cutting steps (see FIG. 8A) are to be performed.

(3-2) Second cutting process step Using a slicer, from the first predetermined position P1a in one tubular portion 50a of the pair of tubular portions 50a, 50b, the first cut X1 and the back side that are put in the front-side predetermined region The second cut X2a is made so as to reach the first cut X1 put in the predetermined area (see FIG. 8A). The second cut X2a is made along a plane perpendicular to the axis of the tubular member 50. Thereafter, as shown in FIGS. 8B to 8D, the same steps as those in the method of manufacturing the secondary mirror according to the first embodiment are performed.

  As described above, the secondary mirror manufacturing method according to the fourth embodiment differs from the secondary mirror manufacturing method according to the first embodiment in the content of the second cutting process, but the secondary mirror manufacturing method according to the first embodiment. As in the case of the method, by performing the four cutting processes, it is possible to reliably form the secondary mirror base material having a relatively complicated structure as described above.

  As mentioned above, although the manufacturing method of the secondary mirror, the light source device, and the projector of this invention were demonstrated based on said embodiment, this invention is not limited to this, It can implement in the range which does not deviate from the summary. For example, the following modifications are possible.

(1) In the first embodiment, as shown in FIG. 3C, the length from the center point X1c of the expansion part to the target point X1a and the length from the center point X1c of the expansion part to the target point X1d Although the first cut X1 is made to be equal, the present invention is not limited to this. For example, the first cut may be made so that the length from the center point X1c of the inflating portion to the target point X1a is not equal to the length from the center point X1c of the inflating portion to the target point X1d.

(2) In the first embodiment, as shown in FIG. 3 (d), the angle between the second cut X2 and the shaft 50ax of the tubular member is 45 °, but the present invention is limited to this. is not. For example, the angle between the second cut and the axis of the tubular member may be other than 45 °.

(3) In the said Embodiment 1, although implemented in this order from the 1st cutting process to the 4th cutting process, this invention is not limited to this. For example, the second cutting process and the third cutting process may be interchanged, or the fourth cutting process may be performed first.
In the second embodiment, the fifth cutting process to the seventh cutting process are performed after the second cutting process to the fourth cutting process, but the present invention is not limited to this. For example, the second cutting process and the fifth cutting process may be performed continuously, the third cutting process and the sixth cutting process may be performed continuously, or the fourth The cutting process and the seventh cutting process may be performed continuously.

(4) In Embodiment 2 or 3, the two secondary mirrors having the same shape are manufactured. However, the present invention is not limited to this. For example, two secondary mirrors having different shapes may be manufactured.

(5) In the above embodiments, the secondary mirror having the cylindrical fixing portions 44, 44a is manufactured. However, the present invention is not limited to this. For example, it is good also as manufacturing a secondary mirror which has a fixing | fixed part which cylindrical part opened.

(6) In each of the above embodiments, each cutting process is performed by making a linear cut (see, for example, FIGS. 3C to 3F), but the present invention is limited to this. Is not to be done. For example, each cutting process may be performed by making a curved cut.

(7) In the above embodiment, an example in which the light source device of the present invention is applied to a projector has been described, but the present invention is not limited to this. For example, the light source device of the present invention can be applied to other optical devices (for example, an optical disk device).

(8) Although the ellipsoidal reflector is used as the reflector in the above embodiment, the present invention is not limited to this. For example, a parabolic reflector can be used.

(9) In the above embodiment, the lens integrator optical system including the first lens array and the second lens array is used as the light uniformizing optical system of the projector. However, the present invention is not limited to this. For example, a rod integrator optical system including a light guide rod can be used.

(10) In the above embodiment, the projector is a transmissive projector, but the present invention is not limited to this. For example, a reflective projector may be used. Here, “transmission type” means that an electro-optic modulation device as a light modulation means, such as a transmission type liquid crystal device, transmits light, and “reflection type” This means that an electro-optic modulation device as a light modulation means, such as a reflective liquid crystal device, is a type that reflects light. Even when the present invention is applied to a reflective projector, the same effect as that of a transmissive projector can be obtained.

(11) In the above embodiment, a projector using three liquid crystal devices has been described as an example, but the present invention is not limited to this. For example, the present invention can also be applied to a projector using one, two, or four or more liquid crystal devices.

(12) In the above embodiment, the liquid crystal device is used as the electro-optic modulation device of the projector, but the present invention is not limited to this. In general, the electro-optic modulation device may be any device that modulates incident light in accordance with image information, and a micromirror light modulation device or the like may be used. For example, a DMD (digital micromirror device) (trademark of TI) can be used as the micromirror light modulator.

(13) The present invention is applied to a rear projection type projector that projects from a side opposite to the side that observes the projected image, even when applied to a front projection type projector that projects from the side that observes the projected image. Is also possible.

It is a figure shown in order to demonstrate the light source device 10 which concerns on Embodiment 1. FIG. It is a figure shown in order to demonstrate the secondary mirror 40 in the light source device 10 which concerns on Embodiment 1. FIG. FIG. 5 is a view for explaining the method for manufacturing the secondary mirror according to the first embodiment. FIG. 2 is a diagram for explaining a projector 1000 according to the first embodiment. It is a figure shown in order to demonstrate the illuminating device 100 in the projector 1000 which concerns on Embodiment 1. FIG. FIG. 10 is a view for explaining a method for manufacturing the secondary mirror according to the second embodiment. It is a figure shown in order to demonstrate the manufacturing method of the secondary mirror which concerns on Embodiment 3. FIG. It is a figure shown in order to demonstrate the manufacturing method of the secondary mirror which concerns on Embodiment 4. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Light source device, 20 ... Light emission tube, 22 ... Tube part, 24, 26 ... Sealing part, 28 ... Light emission part, 30 ... Reflector, 30z ... End part of one side, 30ax ... Center axis of rotation, 40, 40a , 40b ... secondary mirror, 42 ... reflecting part, 44, 44a ... fixed part, 45a ... base end part, 45b ... tip part, 45c ... straight line, 46 ... connecting part, 48 ... extension part, 50 ... tubular member, 50a , 50b, 50c ... tubular portion, 50ax ... shaft of the tubular member, 52 ... expansion portion, 54a, 54b, 54c, 54d, 54e ... cut piece, 56a, 56b, 56c, 56d ... end, 58, 58a, 58b ... Sub mirror substrate, 60 ... reflective layer, 90 ... concave lens, 100 ... illuminating device, 100ax ... illumination optical axis, 120 ... first lens array, 122 ... first small lens, 130 ... second lens array, 132 ... second Small lens, 140 ... polarization conversion element , 150 ... superposition lens, 200 ... color separation light guide optical system, 210, 220 ... dichroic mirror, 230, 240, 250 ... reflection mirror, 260 ... incident side lens, 270 ... relay lens, 300R, 300G, 300B ... condensing Lens, 400R, 400G, 400B ... Liquid crystal device, 500 ... Cross dichroic prism, 600 ... Projection lens, 1000 ... Projector, c ... Cement, R1 ... Predetermined area, L1, L2 ... Light, P1, P1a ... First predetermined position, P2, P2a ... 2nd predetermined position, P3 ... 3rd predetermined position, P4 ... 4th predetermined position, X1 ... 1st cut, X2, X2a ... 2nd cut, X3, X3a ... 3rd cut, X4, X4a ... 1st 4 cuts, X5 ... 5th cut, X6 ... 6th cut, X7 ... 7th cut, X1a, X1b, X1d, X1 ... target point, X1c ... center point of the expansion unit, S ... predetermined plane, SCR ... screen

Claims (8)

An arc tube having a tube part containing a light emitting part and a pair of sealing parts;
A reflector that has a shape in which at least one end portion on one side is deleted when cut along a predetermined plane including the rotation center axis, and reflects light emitted from the light emitting unit toward the illuminated region; and
A secondary mirror that is disposed so as to cover the one side of the tube portion and has a reflecting portion that reflects the emitted light from the light emitting portion toward the light emitting portion;
The secondary mirror further includes a fixing portion for fixing the secondary mirror to the sealing portion with an adhesive, and the fixing portion has a half circumference of an outer periphery of one of the pair of sealing portions. A method of manufacturing a secondary mirror in a light source device configured to cover over,
A tubular member preparation step of preparing a tubular member having an inner diameter corresponding to the inner diameter of the fixed portion;
After the tubular member is heated and placed in a mold, the tubular member is rotated by an inert gas while rotating the tubular member so that a part of the inner surface of the tubular member has a shape corresponding to the reflecting surface of the reflecting portion. Forming part of the tubular member by applying internal pressure to form an inflating part and a pair of tubular parts located on both sides of the inflating part;
A secondary mirror base material forming step of forming a secondary mirror base material having an outer shape corresponding to the secondary mirror by performing a predetermined cutting process on the tubular member that has undergone the forming step of the expanding portion, and the like.
A method of manufacturing a secondary mirror, comprising: a reflective layer forming step of forming a reflective layer on a portion of the secondary mirror base material that becomes the reflective surface in this order. In the manufacturing method of the secondary mirror of Claim 1,
When the inflating part of the tubular member that has undergone the forming step of the inflating part is viewed from a direction orthogonal to the axis of the tubular member, the front side part of the inflating part is a front side inflating part, and the back side part of the inflating part Is the back side expansion part,
The cutting step is
A first cutting step of making a first cut along the longitudinal direction of the tubular member in each of the front side predetermined region including the front side expansion portion in the tubular member and the back side predetermined region including the back side expansion portion in the tubular member; ,
A second cut is made so as to reach from the first predetermined position in one tubular portion of the pair of tubular portions to the first cut in the front-side predetermined region and the first cut in the back-side predetermined region. A second cutting process to be inserted;
A predetermined position in the other tubular portion of the pair of tubular portions, and the first predetermined position is a second predetermined position that is 180 ° apart in the circumferential direction of the tubular member, and is placed in the front-side predetermined region. A third cutting process step of making a third cut so as to reach one cut and the first cut put in the backside predetermined region;
Including a fourth cutting process step of forming a fourth cut so as to cut off an end portion of the one tubular portion and forming the fixing portion in the one tubular portion,
A method of manufacturing a secondary mirror, comprising forming the secondary mirror substrate having the fixed portion on the one tubular portion side. In the manufacturing method of the secondary mirror of Claim 2,
In at least one of the second cutting process and the third cutting process, the sub-mirror manufacturing method is characterized in that a cut is made obliquely so as to approach the expanded portion as the cut is made deeper. In the manufacturing method of the secondary mirror of Claim 2 or 3,
The cutting step is
A fifth cutting process step of making a fifth cut so as to reach the first cut made in the front-side predetermined region and the first cut made in the back-side predetermined region from the third predetermined position in the other tubular portion When,
A predetermined position in the one tubular portion and the third predetermined position is a first notch and a predetermined value on the back side that are put in the front-side predetermined region from a fourth predetermined position that is 180 ° apart in the circumferential direction of the tubular member. A sixth cutting step of making a sixth cut so as to reach the first cut made in the region;
A seventh cutting step of forming a seventh cut so as to cut off an end portion of the other tubular portion and forming the fixing portion on the other tubular portion,
In addition to the secondary mirror substrate having the fixed portion on the one tubular portion side, a secondary mirror substrate having the fixed portion on the other tubular portion side is also formed. Method. In the manufacturing method of the secondary mirror of Claim 4,
In at least one of the fifth cutting process and the sixth cutting process, the sub-mirror manufacturing method is characterized in that a cut is made obliquely so as to approach the expansion portion as the cut is made deeper. In the manufacturing method of the secondary mirror in any one of Claims 1-5,
A method of manufacturing a secondary mirror, wherein the cutting process is performed using a slicer. An arc tube having a tube part containing a light emitting part and a pair of sealing parts;
A reflector that has a shape in which at least one end portion on one side is deleted when cut along a predetermined plane including the rotation center axis, and reflects light emitted from the light emitting unit toward the illuminated region; and
A secondary mirror that is disposed so as to cover the one side of the tube portion and has a reflecting portion that reflects the emitted light from the light emitting portion toward the light emitting portion;
The secondary mirror further includes a fixing portion for fixing the secondary mirror to the sealing portion with an adhesive, and the fixing portion has a half circumference of an outer periphery of one of the pair of sealing portions. A light source device configured to cover over,
The light source device according to claim 1, wherein the sub mirror is a sub mirror manufactured by the method for manufacturing a sub mirror according to claim 1. An illumination device comprising the light source device according to claim 7;
An electro-optic modulation device that modulates illumination light from the illumination device according to an information image;
A projector comprising: a projection lens that projects modulated light from the electro-optic modulation device.

Images