JP2008096629A - Diaphragm blade, diaphragm device and projection type display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a diaphragm device capable of achieving high contrast by making diaphragm amount larger than in the conventional manner even if it is the same irregular color limit state as in the conventional manner. <P>SOLUTION: Two upper and lower triangular notched parts 52 are formed along the opposed edge parts 51 of a pair of diaphragm blades 47, and a crest part 53 and a trough part 54 are alternately formed by the two upper and lower notched parts 52. The positions of the crest part 53 and the trough part 54 are aligned with the positions of boundaries between the lens parts of a multi-lens. When combining the opposed edge parts 51 of the pair of diaphragm blades 47, two upper and lower aperture parts are formed between the plurality of notched parts 52. By optimizing positional relation among the positions of the crest parts 53 and the trough parts 54 of the diaphragm blades 47, the positions of the aperture parts and the positions of the lens parts of the multi-lens, the high contrast is achieved by making the diaphragm amount larger than in the conventional manner even if it is the same irregular color limit state as in the conventional manner. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a diaphragm blade that is arranged in an optical system to reduce the amount of light flux, a diaphragm device using the diaphragm blade, and a projection display device using the diaphragm device.

  2. Description of the Related Art Conventionally, there is known a projection display device that guides light from a light source to display means such as a liquid crystal panel through an optical system, and projects light modulated by the display means onto a screen through the optical system. In such a projection display device, there are cases where a multi-lens and a diaphragm device are arranged between the light source of the optical system and the display means.

  In the multi lens, a plurality of lens portions are arranged in a matrix. There is an illuminance unevenness that the illuminance distribution of the projected light is higher as it is closer to the center of the optical axis, and in order to solve this, the projection light from the light source is divided into a number of light beams corresponding to the number of lens parts of the multi-lens, The divided light flux is again superimposed by the condenser lens and is incident on the display means (see, for example, Patent Document 1).

The diaphragm device generally has a circular opening disposed at the center of the optical axis, and adjusts the contrast by changing the diameter of the opening to control the amount of light flux. In addition, by increasing the amount of aperture and reducing the diameter of the opening, the contrast is improved, while the illuminance decreases, so the shape of the opening is made circular so that both high contrast and high illuminance can be achieved. It has been proposed to form a shape other than the shape, such as a triangle or a substantially trapezoid (see, for example, Patent Document 2).
JP 2000-304905 A (second page) JP 2004-157346 A (page 2-5, FIGS. 8-11)

  Conventionally, when the amount of light flux is reduced by an aperture device, there is a tendency for color unevenness to occur in proportion to the aperture amount. For this reason, in the diaphragm device, the amount of light flux can be narrowed only to a level at which color unevenness does not cause a problem in use of the projection display device, and the contrast cannot be increased.

  SUMMARY OF THE INVENTION The present invention has been made in view of such points, and even in the same color unevenness limit as in the prior art, an aperture blade, an aperture device, and a projection type that can achieve a higher contrast by increasing the amount of aperture than in the prior art. An object is to provide a display device.

  The diaphragm blade according to claim 1 is provided between a first multi-lens having a plurality of lens portions arranged in a matrix and arranged on the light source side, and a second multi-lens arranged to face the first multi-lens. A diaphragm blade used in the invention, which has a diaphragm blade body, a triangular notch is formed at the edge of the diaphragm blade body, and a peak and a valley are formed by this notch, The positions of these peaks and valleys are formed in accordance with the position of the boundary line of the lens portion of the second multi-lens.

  The diaphragm blade according to claim 2 is provided between a first multi-lens having a plurality of lens portions arranged in a matrix and arranged on the light source side, and a second multi-lens arranged to face the first multi-lens. The diaphragm blades used in the invention have a pair of diaphragm blade bodies, and a plurality of triangular notches are formed along the mutually opposing edges of the pair of diaphragm blade bodies. A plurality of crests and troughs are alternately formed by the cutouts, and the positions of these crests and troughs are formed in accordance with the boundary position of the lens part of the second multi-lens, and the pair of diaphragm blades When the mutually opposing edges of the main body are combined, a plurality of openings are formed between the plurality of notches.

  A diaphragm blade according to a third aspect is the diaphragm blade according to the second aspect, wherein the opening is formed at two positions through the center of the optical axis except for the center of the optical axis.

  A diaphragm blade according to a fourth aspect is the diaphragm blade according to any one of the first to third aspects, wherein an angle of the trough is formed at 90 °.

  A diaphragm blade according to a fifth aspect is the diaphragm blade according to any one of the first to third aspects, wherein the angle of the valley portion is formed in accordance with the angle of the diagonal line of the lens portion of the second multi-lens. .

  A diaphragm device according to a sixth aspect includes the pair of diaphragm blades according to any one of the first to fifth aspects, and an opening / closing mechanism that opens and closes the pair of diaphragm blades in a synchronized manner.

  The projection display device according to claim 7 is a light source, an optical system that projects light from the light source, display means that is provided in the optical system and modulates light from the light source, and the light source and display of the optical system. A first multi-lens provided between the first multi-lens and arranged on the light source side, and a second multi-lens arranged opposite to the first multi-lens, The diaphragm apparatus according to claim 6, which is provided between the first multilens and the second multilens.

  According to the diaphragm blade of the first aspect, a triangular notch is formed at the edge of the diaphragm blade body to form a crest and a trough, and the positions of the crest and trough are set to the second multi-point. By forming according to the boundary line position of the lens portion of the lens, the positional relationship between the peak and valley portions of the diaphragm blade body and the position of the lens portion of the second multi-lens can be optimized. Even in an uneven state, it is possible to increase the aperture amount as compared with the prior art and realize high contrast.

  According to the diaphragm blade according to claim 2, a plurality of crests and troughs are alternately formed by forming a plurality of triangular notches along the mutually facing edges of the pair of diaphragm blade bodies, These crests and troughs are formed in accordance with the position of the boundary line of the lens part of the second multi-lens, and when the opposite edges of the pair of diaphragm blade bodies are combined, By forming a plurality of openings between the notches, it is possible to optimize the positional relationship between the positions of the peaks and valleys of the diaphragm blade body, the positions of the openings, and the positions of the lenses of the second multi-lens. Even in a state where the color unevenness is the same as that in the conventional case, the amount of aperture can be increased as compared with the conventional case and a high contrast can be realized.

  According to the diaphragm blade according to claim 3, in addition to the effect of the diaphragm blade according to claim 2, by forming the opening at two places through the center of the optical axis except the center of the optical axis, Even in a state where the color unevenness is the same as in the past, it is possible to increase the aperture amount and realize higher contrast.

  According to the diaphragm blade according to claim 4, in addition to the effect of the diaphragm blade according to any one of claims 1 to 3, by forming the angle of the valley portion at 90 °, the peak portion and the valley portion of the diaphragm blade body And the position of the lens portion of the second multi-lens can be optimized, so that the amount of aperture can be increased and higher contrast can be realized even in the same color unevenness limit state as before.

  According to the diaphragm blade of the fifth aspect, in addition to the effect of the diaphragm blade according to any one of the first to third aspects, the angle of the valley portion is formed in accordance with the diagonal angle of the lens portion of the second multi-lens. As a result, the positional relationship between the peaks and valleys of the diaphragm blade body and the position of the lens portion of the second multi-lens can be further optimized. More can be achieved and higher contrast.

  According to the diaphragm device of the sixth aspect, by using the pair of diaphragm blades according to any one of the first to fifth aspects, the diaphragm amount can be increased more than the conventional one even in the same color unevenness limit state as the conventional one. High contrast.

  According to the projection type display device of the seventh aspect, by using the diaphragm device according to the sixth aspect, it is possible to increase the diaphragm amount more than the conventional one even in the same color unevenness limit state as the conventional one, and the high contrast. A projected image can be projected.

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

  1 to 5 show a first embodiment.

  In FIG. 3, reference numeral 11 denotes a projection display device as a projector. This projection display device 11 modulates light from a light source 12, such as a discharge lamp, an optical system 13 that projects light from the light source 12, and light from the light source 12. The display device 14 is provided. The optical system 13 includes an illumination optical system 13a that guides the light from the light source 12 to the display device 14, and a projection optical system 13b that projects the light modulated by the display device 14.

  The illumination optical system 13 a includes a reflector 16, a condenser lens 17, a first multilens 18, an iris device 19 as an iris, a second multilens 20, a polarization controller 21, a condenser, along the optical axis 15. A lens 22 and a dichroic mirror 23 are disposed. A dichroic mirror 24, a relay lens 25, a total reflection mirror 26, a relay lens 27, a red dichroic filter 28, a total reflection mirror 29, and a relay lens 30 are arranged along the optical axis 15 that passes through the dichroic mirror 23. A field lens 31 is disposed along the optical axis 15 that reflects the dichroic mirror 24. A blue dichroic filter 32, a total reflection mirror 33, and a field lens 34 are arranged along the optical axis 15 that reflects the dichroic mirror 23. Therefore, the light divided in three directions is guided to the display device 14.

  The display device 14 includes display means 35R, 35G, and 35B configured by, for example, a transmissive liquid crystal panel. These display means 35R, 35G, 35B are provided with incident-side polarizing plates 36R, 36G, 36B on the illumination optical system 13a side, and output-side polarizing plates 37R, 37G, 37B are arranged on the opposite projection optical system 13b side. ing. Output-side pre-polarizers 38G and 38B are arranged between the display means 35G and 35B and the output-side polarizers 37G and 37B.

  The projection optical system 13b includes a cross prism 39 that synthesizes RGB color lights that have passed through the display means 35R, 35G, and 35B, and a projection lens 40 that projects a projection image synthesized by the cross prism 39 onto a screen. .

  Further, as shown in FIG. 2, each of the multi lenses 18 and 20 has a plurality of lens portions 41 arranged in a matrix in the vertical direction (vertical direction) and the horizontal direction (horizontal direction). Each lens unit 41 is formed in a quadrangular shape when viewed from the front in the optical axis direction, and a vertical boundary line 42 and a horizontal boundary line 43 of the lens unit 41 are formed in parallel. Then, the light from the light source 12 is divided into a plurality of light beams by the lens portions 41 of the first multi-lens 18, and the divided light beams are divided into the lens portions 41 of the second multi-lens 20, the polarization control means 21, and the like. By superimposing again through the condenser lens 22, the illuminance distribution of the light from the light source 12 is made uniform, and uneven illuminance is eliminated.

  Next, as shown in FIGS. 1 and 2, the diaphragm device 19 has a box-shaped diaphragm device body 46 having square-shaped window portions 45 on both sides, and a window is provided inside the diaphragm device body 46. A pair of aperture blades 47 for opening and closing the portion 45 are provided, and an opening / closing mechanism 48 for opening and closing the pair of aperture blades 47 in synchronization with each other is provided.

  The window portions 45 on both side surfaces are formed in a quadrangular shape with the optical axis 15 as the center, and the multi-lenses 18 and 20 are arranged to face each other.

  The pair of diaphragm blades 47 are supported so as to be slidable in the left-right direction (horizontal direction) with respect to the diaphragm device body 46 around the center of the window 45, and overlap each other in the optical axis direction. It is supported by shifting in the optical axis direction so that it can be done.

  The pair of diaphragm blades 47 have the same shape, are symmetrically formed, and have a thin diaphragm blade body 50. A plurality of upper and lower triangular cutouts 52 are formed along the mutually opposing edges 51 of the pair of diaphragm blade bodies 50, and the upper and lower two cutouts 52 form a peak 53 and a valley. The portions 54 are alternately formed.

  The positions of the upper and lower two cutout portions 52 are two places on the upper and lower sides through the center of the optical axis 15. The angle α of each trough 54 and the angle β of the central peak 53 are each 90 °. As shown in FIG. 2, the positions of the peak portions 53 and the valley portions 54 are formed in accordance with the positions of the boundary lines 43 in the lateral direction of the lens portions 41 of the multi-lenses 18 and 20 in the optical axis direction. Yes. When the first multi-lens 18 and the second multi-lens 20 have different shapes, the positions of the peak portions 53 and the valley portions 54 are the positions in the lateral direction of the lens portions 41 of the second multi-lens 20. It is formed in accordance with the position of the boundary line 43.

  As shown in FIGS. 2 (e) to 2 (g), when the opposing edge portions 51 of the pair of diaphragm blade bodies 50 are combined, the two upper and lower notch portions 52 of the pair of diaphragm blade bodies 50 are combined. Thus, two upper and lower openings 55 are formed. These two upper and lower openings 55 are formed at two upper and lower positions through the center of the optical axis 15 except for the center of the optical axis 15. The shape of the opening 55 is formed in a square because the angle α of each valley 54 is 90 °.

  The opening / closing mechanism 48 includes a mechanism unit (not shown) that slides the pair of diaphragm blades 47 in synchronization with each other, and a motor 57 as a drive unit that drives the mechanism unit.

  Next, the operation of the diaphragm device 19 will be described.

  2 (a) to 2 (h), FIG. 2 (a) shows the fully opened state of the pair of diaphragm blades 47, and FIG. 2 (h) shows the fully closed state of the pair of diaphragm blades 47. 2 (b) to 2 (g) show the process of opening and closing the pair of diaphragm blades 47. FIG.

  For example, by closing the pair of aperture blades 47 in the open state of FIG. 2A, the amount of light flux passing between the pair of aperture blades 47 is reduced. As shown in FIGS. 2 (e) to 2 (g), when the pair of diaphragm blades 47 are combined so as to overlap each other, two upper and lower openings 55 are formed by the two upper and lower notches 52, The light beam passes through the opening 55.

  In the process of closing the pair of diaphragm blades 47, that is, in the process of reducing the amount of light flux, the crests 53 and the troughs 54 of the pair of diaphragm blades 47 are lateral boundaries of the lens units 41 of the multi-lenses 18 and 20. It always matches the position of line 43. Thereby, it is possible to optimize the positional relationship between the peak portion 53 and the valley portion 54 of the pair of diaphragm blades 47 and the position of the lens portion 41 of the multi-lens 18 and 20, even in the same color unevenness limit state as before, Higher contrast can be realized by increasing the amount of aperture than before.

  Further, since the two upper and lower openings 55 are formed at two locations above and below the center of the optical axis 15 except for the center of the optical axis 15, the aperture is limited even in the same color unevenness limit state as before. High contrast can be achieved by increasing the amount.

  FIG. 4 shows the result of measuring the characteristics corresponding to the shape of the diaphragm blades 47. The embodiment is the diaphragm device 19 using the pair of diaphragm blades 47 provided with the cutout portions 52 in the embodiment described above, and the comparative example uses a pair of diaphragm blades not provided with the cutout portions 52. Otherwise, the configuration other than that is the same as that of the diaphragm 19. In both the examples and comparative examples, the open state is a fully open state, and the close state is a state where the color unevenness is not a problem.

  In the figure, NW (Normally White) indicates that the light source is on, the aperture is fully open, and the liquid crystal (display means) transmits light (non-energized state). FW (Full White) indicates that the light source is on, the aperture is fully open, and the liquid crystal is A state where light is transmitted (non-energized state) is indicated, and BK (Black) indicates a state where the light source is on, the aperture is stopped to the limit of uneven color, and the liquid crystal does not transmit light (energized state).

  As a result, in the embodiment, it is possible to increase the aperture amount at the time of closing compared to the comparative example.

  FIG. 5 shows the measurement of the central illuminance on the projection surface. In both the example and the comparative example, the open state is a fully open state and the close state is a state where the color unevenness is not a problem.

  As a result, in the embodiment, the aperture can be increased and the illuminance at the time of closing can be reduced compared to the comparative example, so that high contrast can be obtained.

  Next, FIG. 6 shows a second embodiment.

  In the first embodiment, the angle α of the valley 54 is 90 °, but the angle α of the valley 54 may be other than 90 °. For example, in a state in which the edge portions 51 of the pair of diaphragm blades 47 are closed so as to coincide with each other, the valley portion 54 is more than 90 ° so as to coincide with the vertical boundary line 42 of the lens portion 41 of the multi-lens 18, 20. It may be small. In FIG. 6, in addition to the position of the valley 54 shown by a solid line, a valley 54 of a two-dot chain line having a smaller angle α is also shown, and any of them may be used.

  Next, FIG. 7 shows a third embodiment.

  You may form the angle of the trough part 54 according to the angle of the diagonal of the lens part 41 of the multilenses 18 and 20 which the opening part 55 faces. The multi-lenses 18 and 20 have different sizes depending on the location, and the angle of the diagonal varies depending on the position of the lens unit 41 to be selected, but the position corresponds to the opening 55 formed between the pair of diaphragm blades 47. In the present embodiment, it is formed so as to match the diagonal lines of the central two rows of lens portions 41.

  In this way, by adjusting the angle of the valley portion 54 to the diagonal angle of the lens portion 41 of the multi-lens 18 and 20 facing the opening 55, the aperture amount can be reduced even in the same color unevenness limit state as before. More can be achieved and higher contrast.

  In each of the embodiments described above, two notches 52 and two openings 55 are provided, but any number may be provided, for example, four.

  Further, the aperture device 19 is not limited to the projection display device 11, but can be used for an optical system of another optical device.

It is a front view of the diaphragm | throttle device which shows the 1st Embodiment of this invention. It is explanatory drawing which shows the opening / closing operation | movement of a diaphragm | throttle device same as the above (a)-(h). It is a block diagram of the projection type display apparatus using an aperture apparatus same as the above. It is a table | surface which shows a characteristic about the Example and comparative example of a projection type display apparatus. It is a table | surface which shows the characteristic of the center illumination intensity in a projection surface about the Example and comparative example of a projection type display apparatus. It is a front view of the diaphragm | throttle device which shows the 2nd Embodiment of this invention. It is a front view of the diaphragm | throttle device which shows the 3rd Embodiment of this invention.

Explanation of symbols

11 Projection display
12 Light source
13 Optical system
15 optical axis
18 First multi-lens
20 Second multi-lens
19 Aperture device
35R, 35G, 35B Display means
41 Lens section
43 Border
47 Aperture blade
48 Opening / closing mechanism
50 Aperture blade body
51 Edge
52 Notch
53 Yamabe
54 Tanibe
55 opening

Claims (7)

A diaphragm blade used between a first multi-lens having a plurality of lens portions arranged in a matrix and disposed on the light source side, and a second multi-lens disposed opposite to the first multi-lens. ,
Having a diaphragm blade body,
A triangular cutout is formed at the edge of the diaphragm blade body, and a crest and a trough are formed by the cutout, and the positions of the crest and trough are the lenses of the second multilens. A diaphragm blade characterized by being formed in accordance with the boundary line position of the part. A diaphragm blade used between a first multi-lens having a plurality of lens portions arranged in a matrix and disposed on the light source side, and a second multi-lens disposed opposite to the first multi-lens. ,
Having a pair of diaphragm blade bodies,
A plurality of triangular cutouts are formed along the mutually facing edges of the pair of diaphragm blade bodies, and a plurality of crests and troughs are alternately formed by the plurality of cutouts. The position of the part and the valley part is formed in accordance with the boundary line position of the lens part of the second multi-lens,
A plurality of openings are formed between a plurality of notches when the opposing edges of the pair of diaphragm blade bodies are combined. The aperture blades according to claim 2, wherein the openings are formed at two locations through the center of the optical axis except for the center of the optical axis. The diaphragm blade according to any one of claims 1 to 3, wherein the trough has an angle of 90 °. The diaphragm blade according to any one of claims 1 to 3, wherein an angle of the valley portion is formed in accordance with an angle of a diagonal line of the lens portion of the second multi-lens. A pair of diaphragm blades according to any one of claims 1 to 5,
An aperture device comprising: an opening / closing mechanism for slidingly opening and closing the pair of aperture blades in synchronization. A light source;
An optical system for projecting light from this light source;
A display means provided in the optical system for modulating light from the light source;
A first multi-lens provided between the light source of the optical system and the display means, in which a plurality of lens portions are arranged in a matrix and disposed on the light source side, and a first multi-lens disposed opposite to the first multi-lens. 2 multi-lenses,
A projection type display device comprising: the diaphragm device according to claim 6 provided between the first multi-lens and the second multi-lens.

Images