JP3937349B2 - Optical unit, method for manufacturing the same, and projection display device - Google Patents

Description

  The present invention relates to an optical unit for polarizing and irradiating light emitted from a light source to an image display element such as a liquid crystal display panel, a method for manufacturing the optical unit, and an image projected onto a projection surface such as a screen. The present invention relates to a projection display device.

  As a conventional projection display device, there is a projection display device that projects a color image on a projection surface such as a screen using a liquid crystal display panel on which an image signal is displayed. FIG. 7 is a plan view showing a configuration of an optical system provided in a conventional projection display apparatus.

  As shown in FIG. 7, the light emitted from the light source 110 is reflected by the reflector 120, and the luminance is uniformed by the first integrator 112, the second integrator 113, and the field lens 165. In addition, the light emitted from the light source 110 is subjected to polarization separation and polarization conversion by the polarization conversion element 115 before being incident on the field lens 165 to be an S-polarized light beam. After the polarization conversion, the dichroic mirror 161 reflects and separates only the red light (R), and the dichroic mirror 162 reflects only the green light (G) to separate the green light and the blue light (B). Is done.

  The red light (R) is reflected by the dichroic mirror 161, and then enters the red liquid crystal panel 191R through the reflection mirror 171 and the condenser lens 189R. The green light (G) is reflected by the dichroic mirror 162, and then enters the green liquid crystal panel 191G through the condenser lens 189G. The blue light (B) passes through the dichroic mirror 162, and then enters the blue liquid crystal panel 191B through a relay optical system including relay lenses 181 and 182 and reflection mirrors 172 and 173. The R, G, and B lights are light-modulated by the liquid crystal display panels 191R, 191G, and 191B, and the modulated lights are color-synthesized by the cross dichroic prism 193. After color synthesis, each light is projected onto a projection surface (not shown) by the projection lens 194, and an image is formed on the projection surface.

  When a liquid crystal display panel is used as the image display element, the display principle is to use polarized light regardless of the transmissive and reflective liquid crystal display panels. On the other hand, it is strongly required that the projected image has a uniform brightness and color tone within the projection screen. These requirements are almost determined by the polarization state of illumination light incident on the image display element, uniformity of brightness, incident angle, irradiation position, etc., and the positional accuracy of each optical element constituting the illumination optical system from the light source to the field lens It depends on the setting. Moreover, in the conventional illumination optical system, since the light source and the reflector are integrated, and the lamp as the light source is a consumable item, it is assumed that the light source can be replaced.

On the other hand, in order to position the relative position of the first integrator, the second integrator, and the field lens with high accuracy, a position adjustment mechanism is added to each of the first integrator, the second integrator, and the field lens. A configuration is disclosed in which the integrator lens is configured to be movable so that the polarization state, luminance uniformity, incident angle, irradiation position, and the like of illumination light incident on the image display element can be adjusted after assembly (for example, Patent Documents 1, 2, and 3).
JP-A-10-115799 JP 2000-231077 A JP 2000-314919 A

  However, the above-described conventional technology has the following problems.

  In the above-mentioned Patent Document 1, there is a technique for adjusting the state of illumination light by finely adjusting the mounting positions of the first integrator, the second integrator, the field lens, and the like with respect to the direction intersecting the optical axis. It is disclosed. In the conventional position adjustment mechanism, in order to finely adjust the integrator etc. in the direction intersecting the optical axis, the integrator etc. is supported with a gap with respect to the optical axis direction, so that it can easily move in the direction intersecting the optical axis. It is possible to let That is, it is difficult for the conventional position adjusting mechanism to sufficiently secure the positional accuracy of the integrator or the like in the optical axis direction because the gap is provided in the optical axis direction.

  For this reason, the variation in the size and irradiation position of the light source image produced by the first integrator and the second integrator on the polarization conversion element is large, which causes a reduction in the yield of the final product in the manufacturing process. Further, the conventional projection display device has a disadvantage that the manufacturing cost is increased by adding the position adjusting mechanism, and the manufacturing cost is increased.

  In addition, the above-mentioned Patent Document 2 discloses a configuration that realizes positioning the integrator with high accuracy in the three axial directions by attaching the integrator by urging the positioning means provided in the unit case. Has been. The unit case is provided with positioning means by being integrally molded or processed. However, the positioning means has a structure in which a groove is provided in the unit case, and an integrator is inserted into the groove from the upper part of the unit case. For this reason, this positioning means needs to ensure a predetermined dimensional tolerance (play) in the width of the groove in the optical axis direction, and this dimensional tolerance causes deterioration of the positional accuracy of the integrator in the optical axis direction. ing. Further, since it is necessary to form the groove with a relatively large depth, there is a problem that it is difficult to guarantee the dimensional accuracy of the groove when forming a molding die or molding by injection molding or the like. For this reason, by using additional members such as an integrator holding member, an elastic material, and a leaf spring, these problems are compensated for. Therefore, there are problems in terms of position accuracy and member cost.

  Further, the configuration disclosed in Patent Document 3 described above also has a problem in terms of position accuracy, member cost, and the like because the integrator is provided with a position adjustment mechanism.

  Therefore, the present invention improves the positional accuracy of the relative positions of the first and second lens arrays, the light shielding means, and the polarization conversion element, and improves the brightness of the projected image and the uniformity of the brightness within the projected image. It is an object of the present invention to provide an optical unit that can be used, a manufacturing method thereof, and a projection display device.

In order to achieve the above-described object, an optical unit according to the present invention includes a first lens array on which light emitted from a light source is incident, and a second lens array on which light emitted from the first lens array is incident. A brightness uniformizing optical system for uniformizing the brightness of the light emitted from the light source, a light shielding means for selectively shielding a part of the light emitted from the brightness uniformizing means, and polarizing the light emitted from the light shielding means And a holder member that holds the first lens array and the second lens array. Then, the holder member, the end face of the outer peripheral portion, the first surface is formed for fixing tanning the first lens array position-decided, on the end surface of the outer peripheral portion of the first surface opposite a second lens an array, a second surface for fixing the shielding means tanning position-decided is formed. A polarization conversion element is fixed to the light shielding means. Further, the holder member is formed by injection molding using a molding die having a pair of fixed side die and movable side die. Further, the first surface and the second surface are formed by molding surfaces of the fixed-side mold body and the movable-side mold body that are orthogonal to the moving direction of the movable-side mold body with respect to the fixed-side mold body, respectively.

According to the optical unit according to the present invention configured as described above, the first surface of the holder member, the first lens array is fixed tanning position-decided, on the second surface of the holder member, the second lens The array and the light shielding means to which the polarization conversion element is fixed are positioned and fixed. For this reason, according to this optical unit, the relative positions of the first lens array and the second lens array are positioned with the holder member interposed therebetween, and the first lens array, the second lens array, the polarization The light shielding means to which the conversion element is fixed is positioned with high accuracy.

Further, the holder member provided in the optical unit according to the present invention is formed by injection molding using a molding die having a pair of fixed side mold body and movable side mold body, and the first surface and the second surface are fixed. By forming the side mold body and the movable side mold body respectively by molding surfaces orthogonal to the moving direction of the movable side mold body relative to the fixed side mold body , the first surface and the second surface of the holder member are highly accurate. It is easily formed with dimensional accuracy.

  A projection display device according to the present invention includes the above-described optical unit of the present invention and an image display element irradiated with light emitted from the optical unit.

The method for manufacturing an optical unit according to the present invention includes a first lens array into which light emitted from a light source is incident, and a second lens array into which light emitted from the first lens array is incident. A brightness uniformizing optical system for uniformizing the brightness of the emitted light from the light, a light shielding means for selectively shielding a part of the light emitted from the brightness uniformizing optical system, and polarizing the light emitted from the light shielding means In a method for manufacturing an optical unit comprising a polarization conversion element and a holder member for holding a first lens array and a second lens array, the holder member is for molding having a pair of fixed side mold body and movable side mold body a forming step of forming by injection molding using a mold member, a fixing step of fixing the first lens array position-decided rice on a first surface formed on the end surface of the outer peripheral portion of the holder member, the holder member On the other side of one side A fixing step of fixing by tanning the second lens array position-decided on a second surface which is formed on the end surface of the peripheral portion, and a fixing step of positioning and fixing the polarization conversion element in the light-shielding means, the holder member 2 And a fixing step of positioning and fixing the light shielding means on which the polarization conversion element is fixed . In the molding step, the first surface and the second surface are respectively formed by molding surfaces of the fixed-side mold body and the movable-side mold body that are orthogonal to the moving direction of the movable-side mold body relative to the fixed-side mold body .

  As described above, according to the present invention, it is possible to ensure the positional accuracy of the relative position from the luminance uniformizing optical system having the first lens array and the second lens array to the polarization conversion element with high accuracy. For this reason, according to the present invention, the light use efficiency of the light emitted from the light source is improved, and the brightness of the projected image and the uniformity of the brightness within the projected image can be improved. Furthermore, according to the present invention, the number of parts can be reduced, and the manufacturing cost can be greatly reduced.

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

  FIG. 1 is a perspective view showing an optical unit of the present embodiment, and FIG. 2 is an exploded perspective view showing the optical unit.

  The optical unit of the present embodiment is an optical unit that is applied to a projection display device for projecting an image on a projection surface and irradiates an image display element with uniform brightness of light emitted from a light source.

  As shown in FIGS. 1 and 2, the optical unit 1 of the present embodiment includes a first integrator 12 that is a first lens array into which light emitted from the light source 10 is incident, and the first integrator 12. And an integrator optical system, which is a brightness uniformizing optical system that uniformizes the brightness of the emitted light from the light source. In addition, the optical unit 1 includes a mask 14 that is a light shielding unit that selectively shields part of the light emitted from the integrator optical system, a polarization conversion element 15 that polarizes the light emitted from the mask 14, and a first An integrator holder 11 (hereinafter referred to as an IT holder 11), which is a holder member for holding the integrator 12 and the second integrator 13.

  The first and second integrators 12 and 13 have a plurality of lens groups arranged in a matrix, and are so-called fly eye lenses. The first integrator 12 is positioned and fixed to the first surface A formed on the outer peripheral portion of the IT holder 11 with respect to the X, Y, and Z axis directions that are triaxial directions. The second integrator 13, the mask 14, and the polarization conversion element 15 are positioned with respect to the X, Y, and Z axis directions on the second surface B formed on the outer peripheral portion of the IT holder 11 opposite to the first surface A. Has been fixed.

  The first integrator 12 and the second integrator 13 are bonded and fixed to the first surface A and the second surface B of the IT holder 11 with, for example, a silicon-based adhesive. A mask 14 is bonded to the polarization conversion element 15, and is fixed to the second surface B of the IT holder 11 with a fixing screw 16 through the mask 14.

  As a result, the first integrator 12, the second integrator 13, and the polarization conversion element 15 are held with high accuracy and in parallel with each other by the first surface A and the second surface B of the IT holder 11. The optical system from the first integrator 12 to the polarization conversion element 15 makes the light flux from the light source 10 discrete, and performs polarization conversion on each of the discrete light fluxes, thereby converting single-polarized light. It has a function of irradiating an image display element (not shown).

  Here, the distance in the optical axis direction between the first integrator 12, the second integrator 13, and the polarization conversion element 15 is an important factor that determines the size and aberration of the light source image formed on the polarization conversion element 15. . Further, in addition to the interval in the optical axis direction of each optical element such as the integrators 12 and 13, the positional deviation with respect to the direction orthogonal to the optical axis of each optical element is also important. By arranging these optical elements at optimum relative positions, the illumination light from the light source 10 can be efficiently guided to the image display element.

  The optimum arrangement is obtained by optical simulation or the like. The present invention relates to a specific configuration and manufacturing method for realizing an optimal arrangement of optical elements, and the optical elements can be arranged with high accuracy by the above-described configuration. Furthermore, the structure of the optical unit according to the present invention is characterized in that no mounting bracket is used and no position adjusting mechanism is used, and the number of parts is reduced to the limit. Thus, the structure according to the present invention is extremely useful industrially.

  Hereinafter, the configuration of the optical unit 1 of the present embodiment will be described in more detail.

  First, the IT holder 11 will be described. FIG. 3 is a diagram for explaining the first surface of the IT holder, and FIG. 4 is a diagram for explaining the second surface of the IT holder.

  The IT holder 11 is formed by injection molding with a resin material such as polyetherimide (PEI). Injection molding is a manufacturing method in which a molding material melted by a high-temperature cylinder is poured into a molding die and cooled in this state for a certain period of time, so that a resin material is hardened and a molded product is molded. Although not shown in the drawings, the molding die is a lump of steel material having two basic configurations, including a pair of fixed side die and movable side die in the molding machine. A product is molded by pouring a resin material into a molding space constituted by a cavity and a core between the fixed side mold and the movable side mold. And in a molded article, the dimensional accuracy of the site | part shape | molded by the molding surface orthogonal to the moving direction of a movable side metal mold | die is the highest in the site | part which faced the molding surface of a movable side metal mold | die and a fixed side metal mold | die.

  The Z-axis direction in FIG. 2 indicates the moving direction of the movable-side mold that contacts and separates from the solid mold. As shown in FIG. 2, on the outer periphery of the IT holder 11, the first surface A and the second surface B are parallel to a plane orthogonal to the moving direction of the movable mold with respect to the fixed mold when the mold is opened. The fixed side mold and the movable side mold are respectively formed by molding surfaces. That is, the dimensional accuracy of the parts molded on the first surface A and the second surface B is ensured with high accuracy.

  Therefore, as shown in FIGS. 3A and 3B, the first surface A of the IT holder 11 has an X reference portion 30a for positioning the first integrator 12 in the X-axis direction, and Y Y reference portions 31a for positioning with respect to the axial direction are respectively formed. As shown in FIGS. 4A to 4D, the second surface B of the IT holder 11 has an X reference portion 30b for positioning the second integrator 13 with respect to the X-axis direction, and Y Y reference portions 31b for positioning in the axial direction are formed.

  Further, on the second surface B of the IT holder 11, reference pins 32 and 33 for positioning the mask 14 and the polarization conversion element 15 with respect to the X and Y axis directions are integrally formed, respectively. On the first surface A of the IT holder 11, a Z reference surface 34 that forms a reference surface for positioning the first integrator 12 with respect to the Z-axis direction that is the optical axis direction is formed. Similarly, on the second surface B of the IT holder 11, a Z reference surface 35 that forms a reference surface for positioning the second integrator 13 with respect to the Z-axis direction, a mask 14, and a polarization conversion element 15 are Z A Z reference surface 36 is formed as a reference surface for positioning in the axial direction.

  Each of these three types of Z reference surfaces 34, 35, 36 is orthogonal to the moving direction of the movable mold and faces the molding surfaces of the solid mold and the movable mold, so that it is highly accurate. Is formed. In addition, for example, the entire surface where the first integrator 12 contacts the IT holder 11 is not formed with high accuracy, but the Z reference surface 34 is formed only at a part of the four corners. The dimensional accuracy is further guaranteed.

  In the conventional position adjusting mechanism described above, a groove is formed in the IT holder in parallel with the Y-axis direction, and an integrator or the like is inserted along the groove. Therefore, along with the dimensional tolerance of the groove in the Z-axis direction. Thus, it has been difficult to sufficiently secure the positional accuracy of the integrator or the like in the Z-axis direction. On the other hand, in the present embodiment, the integrator is brought into contact with and fixed to the Z reference surfaces 34, 35, and 36 formed by the molding surfaces of the fixed mold and the movable mold of the IT holder 11. The position accuracy in the Z-axis direction is ensured with high accuracy.

  Next, a method for attaching each optical element to the IT holder 11 will be described. The first integrator 12 is made of heat-resistant glass (Pyrex: trademark) having a thickness of about 2 mm, and has an outer shape of a rectangle having a width of about 43 mm and a length of about 39 mm. The first integrator 12 is formed with a total of 80 lenses having a width of about 4 mm and a length of about 3 mm, 8 rows in width and 10 columns in length. The shape of the second integrator 13 is also the same as that of the first integrator 12. The first integrator 12 is attached to the first surface A of the IT holder 11.

  First, when the first integrator 12 is attached to the IT holder 11, for example, a silicon-based adhesive is applied onto the Z reference surface 35 of the IT holder 11, and the first integrator 12 is attached to the X reference portion 30a and the Y reference portion 30a. The adhesive is abutted against the reference portion 31a, brought into contact with the Z reference surface 34, and fixed by curing the adhesive while maintaining this state. Accordingly, the first integrator 12 is positioned and fixed on the first surface A of the IT holder 11 with high accuracy in the three axial directions.

  The second integrator 13 is also positioned with high accuracy in the three axial directions on the second surface B of the IT holder 11 in the same manner as the method of attaching the first integrator 12. It is fixed via an adhesive. In this state, the first integrator 12 and the second integrator 13 are positioned with respect to the IT holder 11 only with mechanical accuracy. The IT holder 11 is formed with the X reference portions 30a, 30b in the X axis direction, the Y reference portions 31a, 31b in the Y axis direction, and the Z reference surfaces 34, 35, 36 in the Z axis direction with high accuracy. In this way, the respective first and second integrators 12 and 13 are in the X, Y and Z axis directions by being brought into contact with the respective reference portions 30a, 30b, 31a and 31b and the Z reference surfaces 34, 35 and 36, respectively. The relative position to can be positioned with high accuracy.

  The mask 14 is made of an aluminum alloy having a thickness of about 0.5 mm, and slits (gap) for selectively passing a part of the light emitted from the second integrator are formed in a lattice shape. The mask 14 is bonded and fixed to the polarization conversion element 15 by using an adhesive jig (not shown) so that the slit matches the portion where the wavelength plate of the polarization conversion element 15 is present. As shown in FIG. 2, the mask 14 is provided with an attachment reference hole 40 and a screw hole 41. Although not shown, a reference pin inserted into the attachment reference hole 40 of the mask 14 and an abutting reference surface against which the polarization conversion element 15 is abutted are formed on the bonding jig. The mask 14 is placed on the bonding jig, and the polarization conversion element 15 is placed on the mask 14. The polarization conversion element 25 is pressed against the abutting reference surface of the bonding jig, and the mask 14 and the polarization conversion element 15 are bonded and fixed with a silicon-based adhesive. By such a fixing method, the mask 14 and the polarization conversion element 15 are integrated with high accuracy in the X, Y, and Z axis directions.

  After the first integrator 12 and the second integrator 13 are fixed to the IT holder 11, the mask 14 and the polarization conversion element 15 that are already integrated by the fixing method described above are attached. The reference pin 32 of the IT holder 11 is inserted into the mounting reference hole 40 of the mask 14, and the mounting reference hole 40 and the reference pin 32 are engaged, so that the positional accuracy in the X axis direction and the Y axis direction is high. Secured. By bringing the mask 14 into contact with the Z reference surfaces 36 provided at the four corners of the second surface B of the IT holder 11, the positional accuracy of the mask 14 and the polarization conversion element 15 is ensured with high accuracy in the Z-axis direction. The

  In this state of positioning, the mask 14 is screwed and fixed to the IT holder 11 by a fixing screw 26 inserted through the screw hole 41. Note that the wave plate of the polarization conversion element 15 is made of an organic film, and the organic film is vulnerable to ultraviolet rays and heat and easily deteriorates. For this reason, a fixing method by screwing is adopted as a mounting method for the IT holder 11, and the deteriorated mask 14 and polarization conversion element 15 can be easily replaced.

  Each of the reference portions 30a, 30b, 31a, 31b and the reference pin 32 are formed on the IT holder 11 which is one integrally formed member at the same time and with high accuracy at the time of forming. The first integrator 12, the second integrator 13, and the mask 14 and the polarization conversion element 15 are arranged with high accuracy by the reference portions 30a, 30b, 31a, 31b and the reference pin 32, so that the illumination optical system The light utilization efficiency can be improved.

  According to the optical unit 1 described above, the Z reference surfaces 34, 35, 36, the reference portions 30a, 30b, the first surface A and the second surface B formed on the outer periphery of the IT holder 11 with high accuracy. 31a, 31b and reference pins 32, 33 are used as references, and the first and second integrators 12, 13, mask 14, and polarization conversion element 15 are positioned and fixed in the X, Y, Z axis directions, respectively. Thus, the relative positions of the first and second integrators 12, 13, the mask 14, and the polarization conversion element 15 can be positioned with high accuracy. Therefore, according to the optical unit 1, the light loss portion is reduced, the light use efficiency of the light emitted from the light source 10 is improved, the brightness of the projected image and the uniformity of the brightness in the projected image are improved, and the projection is performed. The brightness of the image can be improved by about 5%. Furthermore, according to the optical unit 1, the conventional position adjustment mechanism such as an integrator is not required and the position adjustment process is omitted, so that the number of parts can be reduced and the manufacturing cost can be greatly reduced. it can.

  As described above, the optical unit 1 configured by attaching the first and second integrators 12 and 13 and the like to the IT holder 11 is incorporated in the optical engine 5 provided in the projection display device.

  FIG. 5 shows a plan view of the optical system of the optical engine. FIG. 6 is a perspective view showing a state in which the optical unit is assembled in the optical engine. The configuration of the optical system of the optical engine 5 is the same as that of the conventional projection display device except for the configuration of the optical unit 1.

  As shown in FIG. 5, the emitted light from the light source 10 is reflected by the reflector 20, and the luminance is made uniform by the first integrator 12 and the second integrator 13 of the optical unit 1 and the field lens 65. Further, before the light emitted from the light source 10 enters the field lens 65, the polarization conversion element 15 performs polarization separation and polarization conversion to form an S-polarized light beam. After the polarization conversion, the dichroic mirror 61 reflects and separates only the red light (R), and the dichroic mirror 62 reflects only the green light (G) to separate the green light and the blue light (B). Is done.

  The red light (R) is reflected by the dichroic mirror 61 and then enters the red liquid crystal panel 91R through the reflecting mirror 71 and the condenser lens 89R. The green light (G) is reflected by the dichroic mirror 62 and then enters the green liquid crystal panel 91G via the condenser lens 89G. The blue light (B) passes through the dichroic mirror 62 and then enters the blue liquid crystal panel 91 </ b> B through a relay optical system composed of relay lenses 81 and 82 and reflection mirrors 72 and 73. The R, G, and B lights are light-modulated by the liquid crystal display panels 91R, 91G, and 91B, and the modulated lights are color-synthesized by the cross dichroic prism 93. After color synthesis, each light is projected onto a projection surface (not shown) by the projection lens 94 and forms an image on the projection surface.

  Further, the IT holder 11 provided in the optical unit 1 is provided with positioning pins 42 and leg portions 43 on the bottom surface as shown in FIG. 4 (d), and the top surface as shown in FIG. 4 (c). In addition, a screw hole 44 is provided. The positioning pins 42 are provided at two places with respect to the X-axis direction.

  When the optical unit 1 is assembled into the optical engine 5, the positioning pins 42 of the IT holder 11 are engaged with positioning holes (not shown) provided in the optical base (not shown) of the optical engine 5. As a result, the optical unit 1 is positioned in the X-axis direction, and the optical unit 1 is fixed to the optical engine 5 by a fixing screw 45 inserted through the screw hole 44 as shown in FIG. The positioning of the optical unit 1 does not require high accuracy as compared with the positional accuracy of the arrangement of the first integrator 12 and the second integrator 13 in the optical unit 1, and is therefore orthogonal to the moving direction of the movable mold. Even if the positioning pins 42 are not formed by the molding surfaces of the fixed side mold and the movable side mold parallel to the plane, the optical performance is not deteriorated.

  The influence of the optical axis of the optical unit 1 is adjusted by an adjustment mechanism provided in another optical element of the optical engine 5. The optical engine 5 is provided with first, second, and third adjustment mechanisms 51, 52, and 53 for adjusting the positions of the field lens 65, the reflection mirror 71, and the relay lens 82 with respect to the optical axis, respectively. .

  Therefore, after the optical unit 1 is incorporated in the optical engine 5, as shown in FIG. 6, the position of the field lens 65 with respect to the optical axis is adjusted by the first adjustment mechanism 51, and the reflection mirror is adjusted by the second adjustment mechanism 52. 71 is adjusted with respect to the optical axis, and the third adjusting mechanism 53 adjusts the position of the relay lens 82 with respect to the optical axis.

It is a perspective view which shows the optical unit of embodiment. It is a disassembled perspective view which shows the said optical unit. It is a figure for demonstrating the 1st surface of an integrator holder. It is a figure for demonstrating the 2nd surface of the said integrator holder. It is a top view for demonstrating a projection type display apparatus provided with the said optical unit. It is a perspective view which shows the state which incorporates the said optical unit with respect to an optical engine. It is a top view for demonstrating the conventional projection type display apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical unit 5 Optical engine 10 Light source 11 Integrator holder 12 1st integrator 13 2nd integrator 14 Mask 15 Polarization conversion element 16 Fixing screw 20 Reflector 30a, 30b X reference | standard part 31a, 31b Y reference | standard part 32, 33 Reference | standard pin 34 Z reference plane for the first integrator 35 Z reference plane for the second integrator 36 Z reference plane for the mask and polarization conversion element 40 Mounting reference hole 41 Screw hole 42 Positioning pin 43 Leg portion 44 Fixing screw hole 45 Fixing screw 51, 52, 53 Optical axis adjustment unit 65 Field lens 61, 62 Dichroic mirror 71, 72, 73 Reflection mirror 81, 82 Relay lens 89R, 89G, 89B Condenser lens 91R, 91G, 91B Liquid crystal panel 93 Cross dichroic Kupurizumu 94 projection lens A first side B the second surface

Claims (8)

A first lens array on which light emitted from the light source is incident; and a second lens array on which light emitted from the first lens array is incident, and uniformizing the luminance of the light emitted from the light source Brightness uniformizing optical system,
A light shielding means for selectively shielding part of the light emitted from the brightness uniformizing optical system;
A polarization conversion element for polarizing the light emitted from the light shielding means;
A holder member for holding the first lens array and the second lens array;
Wherein the holder member, the end face of the outer peripheral portion, the first surface of the first lens array and fixed tanning position-decided is formed on the end surface of the outer peripheral portion opposite to the first surface, the second a lens array, a second surface for fixing the light shielding unit position-decided tanning and is formed,
The polarization conversion element is fixed to the light shielding means,
The holder member is formed by injection molding using a molding die having a set of a fixed side die and a movable side die,
The first surface and the second surface are respectively formed by molding surfaces of the fixed-side mold body and the movable-side mold body that are orthogonal to the moving direction of the movable-side mold body with respect to the fixed-side mold body . unit.   The first lens array and the second lens array are positioned on the first surface and the second surface with respect to the optical axis direction of the first lens array and the second lens array, respectively. The optical unit according to claim 1, wherein reference surfaces for fixing are respectively formed.   The first surface and the second surface are formed with reference portions for positioning and fixing with respect to a biaxial direction orthogonal to the optical axis direction of the first lens array and the second lens array. The optical unit according to claim 1 or 2.   The optical unit according to claim 2, wherein a plurality of the reference surfaces are respectively formed on the first surface and the second surface. The reference surface for positioning and fixing the second lens array and a reference surface for positioning and fixing the light shielding unit are formed on the second surface, respectively. Optical unit. The light shielding means has a portion protruding from an outer peripheral portion of the polarization conversion element, and the protruding portion is fixed to a reference surface for positioning and fixing the light shielding means,
On the second surface, a reference surface for positioning and fixing the light shielding means is formed at a position protruding in the optical axis direction from the reference surface for positioning and fixing the second lens array. The optical unit according to claim 5 . The optical unit according to any one of claims 1 to 6 ,
A projection display device comprising: an image display element irradiated with light emitted from the optical unit. Uniform brightness that has a first lens array into which light emitted from the light source is incident and a second lens array into which light emitted from the first lens array is incident, and uniformizes the luminance of the light emitted from the light source An optical system, a light shielding means for selectively shielding a part of the light emitted from the luminance uniforming optical system, a polarization conversion element for polarizing the light emitted from the light shielding means, the first lens array, In the manufacturing method of an optical unit provided with the holder member holding the 2nd lens array,
A molding step of forming the holder member by injection molding using a molding die having a set of a fixed mold and a movable mold;
The first surface which is formed in the end surface of the outer peripheral portion of the holder member, and a fixing step of fixing the first lens array position-decided tanning and,
A fixing step of the a second surface formed on the end surface of the outer peripheral portion opposite to the first surface of the holder member, for fixing the second lens array tanning position-decided,
A fixing step of positioning and fixing the polarization conversion element to the light shielding means;
On the second surface of the holder member, it has a fixed step of positioning and fixing the light shielding means for the polarization conversion element is fixed,
In the molding step, the first surface and the second surface are respectively formed by molding surfaces of the fixed-side mold body and the movable-side mold body perpendicular to the moving direction of the movable-side mold body with respect to the fixed-side mold body. Manufacturing method of optical unit to be formed .

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