CN101320201A - projection display device - Google Patents

Abstract

The object of the present invention is to provide a projection display device which can easily adjust the light quantity continuously so that the light irradiated on the light valve according to the video signal does not produce uneven illumination, so that the video with sufficient contrast can be displayed all the time. The projection display device of the present invention is characterized in that it has: a light valve (2); a light source (3a) that generates light that is irradiated on the light valve (2); an integrating lens (4) that is disposed on the light source (3a) and the light path between the light valve (2), so that the illuminance distribution of the light irradiated from the light source (3a) to the light valve (2) is uniform; and the light quantity adjustment system (9), which is arranged on the light path, has a pair of A rotating mechanism (9a) that is used to adjust the light quantity of light irradiated from the light source (3a) to the light valve (2) and rotates in a way that the door is opened left and right, the rotating mechanism (9a) is formed to reduce the light quantity (shading) ) in the direction of "ㄑ".

Description

projection display device

technical field

The present invention relates to a projection display device having a light quantity adjustment mechanism for adjusting the light quantity of light irradiated on a light valve according to a video signal.

Background technique

In a projection display device, there is a darker image display due to light leakage from various optical elements constituting the optical system, such as a guide optical system and a projection lens, and stray light (unwanted light) generated at the optical elements. Not dark enough to get a higher contrast tendency. Especially when an image is projected on a screen in a dark room, if the dark image cannot be displayed dark enough, it will give the viewer the impression that the contrast is insufficient. In particular, in projection display devices using liquid crystal light valves, the liquid crystal light valves block transmitted light due to the polarization characteristics of light, but cannot completely block transmitted light, and there is a limit in coping with image signal processing, so it is required to improve contrast .

As a countermeasure to solve this problem, a light shield is arranged between the first lens array and the second lens array, and the plate-shaped light shield is rotated according to the video signal, thereby suppressing the light quantity of light irradiated on the light valve and improving projection. to the contrast of an image on a screen or the like (for example, refer to Patent Document 1).

Patent Document 1: WO 2005-026835 Publication

In Patent Document 1, when the shape of the front end of the shading plate has a rectangular surface in the direction perpendicular to the shading plate, in the vicinity of the first lens array, when the front end of the shading plate is located in the second lens array in the direction of rotation of the shading plate When the center of curvature of the shading plate is at the center of the curvature, the rectangular surface of the shading plate is imaged on the light valve, so there is a problem of linear uneven illuminance in the direction of rotation on the light valve and the direction perpendicular to the direction of the optical axis. In addition, depending on the shape of the tip of the light-shielding body, there is also a problem that sufficient contrast cannot be obtained.

Contents of the invention

The present invention was made to solve the above-mentioned problems, and its object is to provide a projection type display device that can easily perform continuous light quantity adjustment so that the light irradiated on the light valve according to the video signal does not produce uneven illuminance, thereby An image with sufficient contrast can always be displayed.

In order to solve the above-mentioned problems, the projection type display device of the present invention is characterized in that it has: a light valve; a light source that generates light irradiated on the light valve; The illuminance distribution of the light irradiated from the light source to the light valve is uniform; and the light quantity adjustment mechanism, which is arranged on the light path, has a pair of light shielding bodies that rotate in a way of opening left and right, and the pair of light shielding bodies are used to adjust the light source from the light source. The amount of light irradiated on the light valve is formed so that the light-shielding body bends in a "く" shape in a direction that reduces the amount of light when it is rotated.

According to the present invention, since there are: an integrating lens arranged on the optical path between the light source and the light valve to make the illuminance distribution of light irradiated from the light source to the light valve uniform; and a light quantity adjusting mechanism arranged on the optical path and having A pair of light-shielding bodies for adjusting the amount of light irradiated from the light source to the light valve, which rotate in a double-sided manner, and the light-shielding bodies are formed to bend in a "く" shape in the direction of reducing the light amount when turning, Therefore, it is possible to easily perform continuous light quantity adjustment, so that the light irradiated on the light valve according to the video signal does not produce uneven illuminance, so that images with sufficient contrast can always be displayed.

Description of drawings

1 is a configuration diagram of an illumination optical system of a projection display device according to Embodiment 1 of the present invention.

FIG. 2 is a configuration diagram of a polarization conversion element according to Embodiment 1 of the present invention.

FIG. 3 is a diagram showing an example of the shape of a turning mechanism according to Embodiment 1 of the present invention.

FIG. 4 is a diagram showing the turning operation of the turning mechanism according to Embodiment 1 of the present invention.

5 is a diagram showing the relationship between the rotation angle and the relative light intensity ratio when the rotation mechanism according to Embodiment 1 of the present invention has the shape shown in FIG. 3 .

6 is a diagram showing the position of the tip of the rotation mechanism in the z direction when the relative light intensity ratio is 20% according to Embodiment 1 of the present invention.

7 is a diagram showing an illuminance distribution of light irradiated on a light valve when the rotating mechanism according to Embodiment 1 of the present invention completely shields light in the shape shown in FIG. 3 .

8 is a graph showing the relationship between the rotation angle and the relative light intensity ratio when no concave portion is formed on the light shielding body according to the embodiment of the present invention.

9 is a diagram showing a light source image in the vicinity of a second lens array according to Embodiment 1 of the present invention.

FIG. 10 is a diagram showing an example of the shape of a turning mechanism according to Embodiment 1 of the present invention.

11 is a diagram showing the relationship between the rotation angle and the relative light intensity ratio when the rotation mechanism according to Embodiment 1 of the present invention has the shape shown in FIG. 10 .

FIG. 12 is a diagram showing a trajectory of light with respect to the shape of the rotation mechanism according to Embodiment 1 of the present invention.

FIG. 13 is a diagram showing the trajectory of light when the size of the rotating mechanism according to Embodiment 1 of the present invention is smaller than that of the lens array.

FIG. 14 is a diagram showing light trajectories when backward ray tracing is performed from the center of the light valve according to Embodiment 1 of the present invention.

FIG. 15 is a diagram showing the rotational position of the rotational mechanism when an image is formed on the light valve according to Embodiment 1 of the present invention.

FIG. 16 is a diagram showing the rotational position of the rotational mechanism when an image is formed on the light valve according to Embodiment 1 of the present invention.

FIG. 17 is a diagram showing an illuminance distribution of light irradiated on the light valve according to Embodiment 1 of the present invention.

FIG. 18 is a diagram showing an illuminance distribution of light irradiated on the light valve according to Embodiment 1 of the present invention.

19 is a graph showing relative light intensity ratios on the respective y-axes in FIG. 17 and FIG. 18 according to Embodiment 1 of the present invention.

20 is a configuration diagram of an illumination optical system of a projection display device according to Embodiment 2 of the present invention.

FIG. 21 is a diagram showing the rotational position of the rotational mechanism when an image is formed on the light valve according to Embodiment 2 of the present invention.

FIG. 22 is a diagram showing the rotational position of the rotational mechanism when an image is formed on the light valve according to Embodiment 2 of the present invention.

23 is a diagram showing the illuminance distribution of light irradiated on the light valve according to Embodiment 2 of the present invention.

24 is a graph showing relative light intensity ratios on the respective y-axes in FIG. 23 according to Embodiment 2 of the present invention.

Fig. 25 is a diagram showing the shape of the tip of the turning mechanism according to Embodiment 2 of the present invention.

26 is a configuration diagram showing an illumination optical system of a projection display device according to Embodiment 3 of the present invention.

27 is a diagram showing the optical path of light incident on the light valve according to Embodiment 3 of the present invention.

FIG. 28 is a diagram showing trajectories of light passing through the second lens array and the polarization conversion element according to Embodiment 3 of the present invention.

29 is a diagram showing the relationship between the incident angle of light incident on the light valve according to Embodiment 3 of the present invention and the contrast.

FIG. 30 is a diagram showing an example of the shape of a turning mechanism according to Embodiment 3 of the present invention.

FIG. 31 is a diagram showing the light quantity of light passing through each unit of the second lens array 4 b according to Embodiment 3 of the present invention.

FIG. 32 is a diagram showing traces of light emitted from the light source 3 according to Embodiment 3 of the present invention.

33 is a diagram showing the illuminance distribution of light irradiated on the light valve according to Embodiment 3 of the present invention.

34 is a diagram showing an example of the shape of a turning mechanism according to Embodiment 3 of the present invention.

35 is a diagram showing the relationship between the rotation angle and the relative light intensity ratio when the rotation mechanism according to Embodiment 3 of the present invention has the shape shown in FIG. 30 .

Fig. 36 is a diagram showing an example of the shape of a turning mechanism according to Embodiment 3 of the present invention.

37 is a diagram showing the relationship between the rotation angle and the relative light intensity ratio when the rotation mechanism according to Embodiment 3 of the present invention has the shape shown in FIG. 35 .

Fig. 38 is a diagram showing an example of the shape of a turning mechanism according to Embodiment 3 of the present invention.

Detailed ways

Embodiments of the present invention will be described below using the drawings.

<Embodiment 1>

FIG. 1 is a configuration diagram of an illumination optical system 1 of a projection display device according to Embodiment 1 of the present invention. As shown in FIG. 1 , the illumination optical system 1 is composed of an integrating lens 4 , a polarization conversion element 5 , a condenser lens 6 , a field lens 7 and a polarizer 8 located between the light source system 3 and the light valve 2 . In addition, the projection display device according to Embodiment 1 of the present invention has a projection lens (not shown) for projecting the light emitted from the light valve 2 onto a screen. In addition, the light valves 2 are provided on respective optical paths of RGB, and the illumination optical system 1 shown in FIG. 1 typically shows one of the respective optical paths of RGB.

The light valve 2 uses a liquid crystal light valve in the embodiment of the present invention, but when using a lens array, it may also be a DMD (Digital Micro-Mirror Device, digital micromirror device) and a reflective liquid crystal display element.

The light source system 3 is provided for irradiating light to the light valve 2, and is composed of a light source 3a and a reflector 3b for reflecting the light emitted from the light source 3a to the integrator lens 4 side. A high-pressure mercury lamp, a halogen lamp, or a xenon lamp is usually used as the light source 3a, but any light emitting device may be used, for example, an LED (light emitting diode), a laser, an electrodeless discharge lamp, or the like. The shape and structure of the reflection mirror 3b are not particularly limited, and it is formed, for example, as a paraboloid or an ellipse, and it may have any shape and structure as long as it converges light on the polarization conversion element 5 . For example, in the case of making the light incident on the integrating lens 4 approximately parallel to the optical axis C, the shape of the reflector 3b can be made a paraboloid, or when it is an elliptical surface, in order to make the light approximately parallel, the light source system 3 can be used. What is necessary is just to arrange means, such as a concave lens, between the integrator lens 4 (refer FIG. 32).

The integrating lens 4 is arranged on the optical path between the light source system 3 and the light valve 2, and is used to uniformize the illuminance distribution irradiated from the light source system 3 onto the light valve 2, and is separated by the first lens array 4a and the first lens array 4a. The second lens array 4b arranged at intervals is constituted. Both the first lens array 4a and the second lens array 4b are formed by a plurality of convex lenses arranged vertically and horizontally, and the convex lenses of the first lens array 4a and the convex lenses of the second lens array 4b are arranged opposite to each other.

The polarization conversion element 5 converts the incident light beam into linearly polarized light and emits it, and is arranged at appropriate intervals in the x-axis direction. FIG. 2 is a configuration diagram of the polarization conversion element 5 according to Embodiment 1 of the present invention. As shown in FIG. 2, the polarization conversion element 5 is composed of a plurality of polarization separation films 5a arranged obliquely (for example, at 45 degrees) with respect to the optical axis C direction (z direction); a plurality of reflection films 5b arranged Arranged between the respective polarization separation films 5a so as to be inclined (for example, inclined at 45 degrees) with respect to the optical axis C direction (z direction); On the part of the surface irradiated with the light transmitted through the polarization separation film 5a. The light incident on the polarization conversion element 5 is separated into s-polarized light and p-polarized light by the polarization separation film 5 a. The p-polarized light passes through the polarization separation film 5a, is converted into s-polarized light by the λ/2 retardation plate 5c, and exits from the polarization conversion element 5. On the other hand, the s-polarized light is reflected on the polarization separation film 5 a, is reflected by the reflection film 5 b, and then exits from the polarization conversion element 5 . Therefore, almost all the light beams emitted from the polarization conversion element 5 are s-polarized light.

The light amount adjustment system 9 (light amount adjustment mechanism) has a pair of light-shielding bodies that rotate in a way of opening left and right, that is, the rotation mechanism 9a, which is arranged on the optical path and is used to adjust the light amount of light irradiated from the light source system 3 to the light valve 2 , the light amount adjustment system 9 is composed of: a rotating mechanism 9a, which is arranged between the first lens array 4a and the second lens array 4b; a signal detection part 9b, which detects the image signal input to the light valve 2, and calculating a relative light quantity ratio of the light quantity irradiated on the light valve 2; and a rotation control part 9c which controls the rotation of the rotation mechanism 9a based on the relative light quantity ratio calculated by the signal detection part 9b. As shown in FIG. 3( b ), the rotating mechanism 9 a is composed of light shielding bodies 9T and 9B that are bent in a "く" shape in a direction to reduce the amount of light (shield light). Moreover, the light shielding bodies 9T and 9B are formed in the concave-shaped part 9g whose front-end|tip part is cut|disconnected and restrict|limits the passage of light. The concave portion 9g may have any shape such as a concave curved shape, a parabolic shape, a semi-elliptical shape, or a triangular shape.

The enhancement of the contrast will be described below. When the relative light intensity ratio of the video signal is 100%, the relative light intensity of 100% is adjusted so that the light is not blocked by the rotating mechanism 9a. For example, when the relative light intensity ratio of the video signal is 20%, the rotation mechanism 9a performs light shielding so that the relative light intensity ratio is 20%, thereby finely adjusting the video signal by about 5 times. In addition, by reducing the relative light intensity ratio through the light shielding of the rotating mechanism 9a, a darker effect can be achieved than when the video signal is a signal with a relative light quantity ratio of 0% and black is not shielded. That is, since the transmittance of the light valve 2 is substantially constant, by reducing the amount of light irradiated on the light valve 2 by the rotating mechanism 9a, the image projected on the screen can be darkened to improve contrast.

Fig. 4(a) is a diagram showing the rotation action of the light-shielding bodies 9T and 9B in Fig. 3(a) in units of 15 degrees, and Fig. 4(b) is a diagram showing the light-shielding body 9T in Fig. 3(b) The rotation action diagram when the rotation action of 9B and 9B is rotated in units of 15 degrees. According to Fig. 4 (a) and Fig. 4 (b), it can be seen that the movement amount of the front ends of the light-shielding bodies 9T and 9B in the z direction is that the movement amount Zb shown in Fig. 4 (b) is smaller than that shown in Fig. 4 (a) The amount of movement is Za (Za>Zb), so in FIG. 4( b ), the amount of movement in the y direction is large for each rotation angle of the light shielding bodies 9T and 9B. Therefore, the shapes of the shades 9T and 9B shown in FIG. 4( b ) can achieve an illuminance with a relative light quantity ratio of 100% with a small rotation angle.

FIG. 5 is a diagram showing the relationship between the rotation angle and the relative light intensity ratio when the rotation mechanism 9a has the shape shown in FIG. 3 . γT and γB in Fig. 3(b) are 20 degrees, and the rotation angle of each rotation mechanism 9a is 2 degrees. Moreover, the rotation angle of 0 degrees refers to when the light-shielding bodies 9T and 9B are completely closed, that is, when the light-shielding bodies 9T and 9B are in the state shown by 41a and 41b in FIG. 4 . The curve 50 shows the simulation result of the turning mechanism 9a having the shape shown in FIG. 3( a ), and the curve 51 shows the simulation result of the turning mechanism 9 a having the shape shown in FIG. 3( b ). As shown in FIG. 5 , the curve 51 rises faster than the curve 50 when the relative light intensity is relatively low, and the relative light intensity ratio reaches 100% when the rotation angle is about 75 degrees. Since the operating angle range is narrow, the shape shown in FIG. 3( b ) enables more responsive control than the shape shown in FIG. 3( a ). Furthermore, it can be seen from the curve 50 and the curve 51 that, except for the place where the relative light quantity is relatively low, the change of the relative light quantity ratio with respect to the rotation angle is approximately equal. Based on the above, as will be described later in FIG. 14 , when the relative light intensity is relatively low, the illuminance can be reduced by forming the front ends of the light shields 9T and 9B to be bent in the direction of the radius of rotation in a "く" shape. uneven. Furthermore, as can be seen from FIG. 5 , continuous light quantity adjustment can be performed by forming two concave portions 9 g at respective front ends of the light shielding bodies 9T and 9B as shown in FIG. 3 . In addition, in the embodiment of the present invention, γT and γB are set at 20 degrees, but any angles may be used, and the same effect can be obtained even if the relationship of γT=γB is not the same. In addition, the relationship between the rotation angle of the rotation mechanism 9a and the relative light intensity ratio on the light valve 2 shown in the embodiment of the present invention shows the relationship when a signal with a relative light intensity ratio of 100% is input, and only the rotation mechanism 9a is shown. characteristic.

度，图3(b)所示形状时的转动角度约为14度，

度。并且，在图6(b)中，α3＝γT＝20度。在图6(a)中，把遮光体9T和9B的长度设为d1，在图6(b)中，把从遮光体9T和9B的转动轴到折弯部的长度设为d2，把从折弯部到前端的长度设为d3。根据以上条件，计算图3(b)中的遮光体9T和9B的前端在z方向上的位置。FIG. 6 shows positions in the z direction of the front ends of the shades 9T and 9B when the relative light quantity ratio in FIG. 5 is 20%. As shown in Figure 6(a), the rotation angle of the shape shown in Figure 3(a) is about 24 degrees,

degree, the rotation angle when the shape shown in Fig. 3(b) is about 14 degrees,

Spend. Also, in FIG. 6( b ), α3=γT=20 degrees. In Fig. 6 (a), the length of the light-shielding bodies 9T and 9B is set as d1, and in Fig. The length from the bent portion to the tip is set to d3. Based on the above conditions, the positions in the z direction of the front ends of the light shielding bodies 9T and 9B in FIG. 3( b ) are calculated.

According to FIG. 6( a ) and FIG. 6( b ), the movement amounts Zc and Zd of the light shielding bodies 9T and 9B in the z direction are represented by the following equations (1) and (2).

$\mathrm{<span\; class="notranslate">\; Z</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="d"\; filenames="A20081009867300221.png,A20081009867300252.png"\; state="\{\{state\}\}">d</figure-callout></span>}\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; sin</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&alpha;</span>}\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; <figure-callout\; id="3"\; label="d"\; filenames="A20081009867300221.png,A20081009867300332.png"\; state="\{\{state\}\}">d</figure-callout></span>}\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; sin</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&alpha;</span>}\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; \&alpha;</span>}\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

According to Fig. 4(b), d1 is represented by formula (3).

Therefore, Zc is represented by the formula (4), so the condition Zc>Zd is satisfied from the formula (5).

1＞d2/d3 ...(5)

Therefore, by making the length of d2 shorter than d3, the shape shown in FIG. 3(b) can reduce illuminance unevenness compared to the shape shown in FIG. 3(a). The cause of uneven illuminance is not only the moving distance of the front ends of the light-shielding bodies 9T and 9B, so the condition of formula (5) is preferable, but not necessarily satisfied.

FIG. 7 is a diagram showing an illuminance distribution of light irradiated on the light valve 2 when the light is completely shielded in the shape shown in FIG. 3( b ). When the light is completely shielded, the light incident on the second lens array 4b uniformly overlaps and irradiates substantially the entire light valve 2 (region 7a) and both peripheral portions in the x direction (region 7b), so that uneven illumination does not occur. The area 7a shows the illuminance distribution of light irradiated on the light valve 2 from the unit (area 30 in FIG. The illuminance distribution of the light irradiated on the light valve 2 from the cell (area 31 in FIG. 3( b )) when the opening of the cell of the array 4b is approximately half opened.

FIG. 8 is a graph showing the relationship between the rotation angle and the relative light intensity ratio when no concave portion is formed on the light shielding bodies 9T and 9B having no bent portion. Simulations were performed with rotation angles in units of 2 degrees. From the curve 80, it can be seen that the change of the relative light intensity ratio with respect to the rotation angle is not continuous, and there are four flat portions (8a, 8b, 8c, 8d).

FIG. 9 is a diagram showing a light source image in the vicinity of the second lens array 4b. FIG. 9 utilizes a grayscale representation of 256 grayscales. According to FIG. 9 , 9 a , 9 b , 9 c , and 9 d represent dark portions between light source images in the +y direction, respectively. The four flat parts 8a, 8b, 8c, 8d in Fig. 8 correspond to the dark parts 9a, 9b, 9c, 9d between the four light source images shown in Fig. 9, and it can be confirmed that the dark parts between the light source images are The effect of the flat part. Therefore, in order to continuously change the light intensity, it is necessary to simultaneously shield the bright and dark portions between the light source images. As shown in FIG. 3, if recessed portions are formed on the light-shielding bodies 9T and 9B, the amount of light can be continuously changed as shown in FIG. of light and shade.

FIG. 10 is a diagram showing an example of the shapes of the light shields 9T and 9B, and one concave portion 9g is formed symmetrically with respect to the optical axis C. As shown in FIG. In the case of complete shading with this shape, the irradiance distribution on the light valve 2 is approximately uniform.

FIG. 11 is a graph showing the relationship between the rotation angle and the relative light quantity ratio when the shades 9T and 9B have the shapes shown in FIG. 10 . In FIG. 10, γT and γB of the light-shielding bodies 9T and 9B are set to 20 degrees. A curve 110 represents a simulation result of the rotating mechanism 9 a having the shape shown in FIG. 10 . The curve 80 shows the simulation result of the rotation mechanism 9a without the recessed part shape shown in FIG. 8, and the effect of the presence or absence of the recessed part 9g is compared. For ease of comparison, curve 80 is shifted to coincide with curve 110 . According to FIG. 11 , when one concave portion 9 g is formed on the light shielding bodies 9T and 9B, the amount of light can be continuously adjusted compared to the light shielding bodies 9T and 9B without the concave portion. That is, forming at least one concave portion 9g on the light-shielding bodies 9T and 9B is effective for continuous adjustment of the amount of light. However, according to the curve 51 of FIG. 5 and the curve 110 of FIG. 11 , compared with the case of forming one concave portion, the light intensity change is smoother when two concave portions are formed, so in order to perform smoother light intensity adjustment, it is preferable to form a plurality of concave portions. .

Fig. 12 is a diagram showing the trajectory of light when turning to the side of the first lens array 4a when the light-shielding bodies 9T and 9B are light-shielding, especially showing the light passing through the lens unit farthest from the center in the +y direction in the first lens array 4a trajectory diagram. Here, only the shade 9T will be described, but the same applies to the shade 9B. 120a indicates a trajectory of light passing through the center of the lens unit on the +y side, 120b indicates a trajectory of light passing through the center of the lens unit, and 120c indicates a trajectory of light passing through the center of the lens unit on the −y side. As shown in FIG. 12, when the bending angle of the light-shielding body 9T is small or the bending position is far away from the rotation axis, the unnecessary light reflected at the light-shielding body 9T passes through the second lens array 4b, and is transmitted to the illumination optical system 1. Multiple reflections within the frame (not shown) may appear on the screen. Therefore, it is preferable that the light shielding bodies 9T and 9B rotate toward the second lens array 4b side during light shielding, rather than the light shielding bodies 9T and 9B in the opening and closing direction shown in FIG. 12 .

FIG. 13( a ) is a diagram showing light trajectories when the shades 9T and 9B have smaller dimensions in the x-direction and y-direction than the first lens array 4 a and the second lens array 4 b. And, Fig. 13 (b) is the comparison diagram of the size on the x direction and the y direction of each light-shielding body 9T and 9B and the x-direction and the size of the y direction of the second lens array 4b, and represents each light-shielding body 9T and 9B The dimensions in the x direction and the y direction are smaller than those of the second lens array 4b in the x direction and the y direction. Here, only the shade 9T will be described, but the same applies to the shade 9B. 130a represents the trajectory of light passing through the center of the lens unit at the 5th position in the +y direction from the optical axis C of the first lens array 4a, and 130b represents the trajectory of light passing through the center of the lens unit in the +x direction side, wherein , the lens unit is located at the second position in the +y direction and the third position in the +x direction from the optical axis C of the first lens array 4a. From FIG. 13( a ), it can be seen that the light passing through the first lens array 4 a on the +y side of the rotation axis of the light-shielding bodies 9T and 9B passes through the +y side without touching the light-shielding bodies 9T and 9B. Therefore, in order to adjust the light quantity of light emitted from the first lens array 4a by the light shields 9T and 9B, it is preferable that the dimensions of the light shields 9T and 9B in the x direction and the y direction are larger than the first lens array 4a and the second lens array 4b. When the size of the second lens array 4b is larger than that of the first lens array 4a, the size of the x-direction and the y-direction of the light-shielding bodies 9T and 9B is preferably larger than that of the second lens array 4b, but through the second lens array 4b and the polarization conversion element A light-shielding plate is arranged between 5 to shield unwanted light passing through the second lens array 4b. Therefore, the dimensions in the x-direction and y-direction of the light-shielding bodies 9T and 9B do not necessarily have to be larger than the first lens array 4 a and the second lens array 4 b.

FIG. 14 is a diagram showing the trajectory of light when ray tracing is performed backward from the center of the light valve 2 . 140 represents a trajectory of light, and a region 141 represents a position where light shown at 140 converges. It can be confirmed from FIG. 14 that the image near the first lens array 4a is formed on the light valve 2, so the light valve 2 has a conjugate relationship with the vicinity of the incident surface of the first lens array 4a. Therefore, when the front ends of the light shields 9T and 9B are located near the region 141 , the front ends of the light shields 9T and 9B are imaged on the light valve 2 , and linear unevenness of illuminance occurs in the x direction near the center on the light valve 2 . Therefore, it is preferable to arrange the front ends of the light-shielding bodies 9T and 9B close to the second lens array 4b, that is, arrange the rotation axis near the second lens array 4b.

And, looking at the front end portions of the light-shielding bodies 9T and 9B, if the light-shielding bodies 9T and 9B are formed so as to be bent in a "く" shape in the direction of reducing the amount of light (shielding light), the y Since the width of the image in the direction (see dy1 in FIG. 15 and dy2 in FIG. 16 ) becomes small, it is possible to reduce the unevenness of illuminance generated in the light valve 2 . Therefore, by forming the light-shielding bodies 9T and 9B to be bent in a "く" shape in the direction of reducing the light amount (shielding light), it is possible to reduce the unevenness of illuminance generated on the light valve 2 .

15 and FIG. 16 are diagrams showing the rotational positions of the light-shielding bodies 9T and 9B when the front ends of the light-shielding bodies 9T and 9B are formed on the light valve 2 in the shape shown in FIG. 3(a) and FIG. 3(b). picture. As a condition for generating imaging on the light valve 2, the front ends of the light-shielding bodies 9T and 9B are located in the vicinity of the first lens array 4a, and at the same position as the center of curvature of the lens units, which are obtained from the second lens array 4b. The optical axis C starts from the second lens unit in the +y or -y direction. 150 , 151 , 160 , and 161 all represent axes passing through the center of curvature of the second lens unit in the +y or -y direction from the optical axis C of the second lens array. 152, 162 both represent the front-end|tip part of 9 T of light shielding bodies.

The reason why the front ends of the light-shielding bodies 9T and 9B are at the same position as the center of curvature of the second lens unit in the +y or -y direction from the optical axis C of the second lens array 4b will be described. First, at the same position as the center of curvature of the first lens unit in the +y or -y direction from the optical axis C of the second lens array 4b, the illuminance is low, and it is difficult to confirm the light generated on the light valve 2. Uneven illumination. And, at the same position as the center of curvature of the third lens unit in the +y or -y direction from the optical axis C of the second lens array 4b, from the optical axis C in the +y or -y direction The 1st lens unit and the 2nd lens unit on the top, the light without illuminance unevenness is superimposed on the light valve 2, so the illuminance unevenness on the light valve 2 caused by the 3rd lens unit is relatively low , difficult to confirm. Therefore, as a condition for easily confirming the images of the front ends of the light-shielding bodies 9T and 9B on the light valve 2, the front ends of the light-shielding bodies 9T and 9B are arranged in the +y or -y direction from the optical axis C of the second lens array 4b. The same position as the center of curvature of the second lens unit.

Fig. 17(a) shows the simulation results of the illuminance distribution on the light valve 2 in the state shown in Fig. 15 when the shape of the concave portion 9g shown in Fig. 3(a) does not exist; 3(b), the simulation results of the illuminance distribution on the light valve 2 in the state shown in FIG. 16 are obtained. As shown in FIG. 17 , 170 a and 170 b represent areas with low illuminance, and 171 a and 171 b represent the y-axis passing through the center of the light valve 2 . Comparing 170a and 170b, it can be confirmed that the illuminance unevenness of 170b is small. This is because the relationship between dy1 in FIG. 15 and dy2 in FIG. 16 is dy1>dy2. Therefore, by forming the light-shielding bodies 9T and 9B to be bent in a "く" shape in the direction of reducing the light amount (shielding light), it is possible to reduce the unevenness of illuminance generated on the light valve 2 . From the above, even if the condition of the above-mentioned formula 5 is not met, if the light shielding bodies 9T and 9B are formed by bending, it is possible to reduce the unevenness of illuminance.

FIG. 18 shows the simulation results of the illuminance distribution on the light valve 2 in the state shown in FIG. 16 when the shape shown in FIG. 3( b ) is used. As shown in FIG. 18 , there is almost no region of low illuminance in the x direction from the center of the light valve 2 . 180 denotes a region of low illuminance in the y direction from the center of the light valve 2 , and 181 denotes a y-axis passing through the center of the light valve 2 . The concave portions 9g of the light-shielding bodies 9T and 9B are located at the condensing positions of the second lens array 4b, and slight unevenness in illuminance can be confirmed in the area 180, but the illuminance distribution of the entire light valve 2 is substantially uniform, so there is no problem. Therefore, the light-shielding bodies 9T and 9B are bent into a "く" shape in the direction of reducing the amount of light (shielding light), at least one concave portion is formed at the front end portion of the light-shielding bodies 9T and 9B, and the light outside the concave portion at the front end is reduced. The flat portion reduces the overlap of the front end shape imaged on the light valve 2, and can greatly reduce the unevenness of illumination.

FIG. 19 is a graph showing relative light quantity ratios in the y direction on the y axes 171 a , 171 b , and 181 respectively shown in FIG. 17( a ), FIG. 17 ( b ) and FIG. 18 . The horizontal axis corresponds to the vertical axis of the light valve 2 shown in FIG. 18 . As shown in FIG. 19 , 190 denotes the relative light quantity ratio at 171 a , 191 denotes the relative light quantity ratio at 171 b , and 192 denotes the relative light quantity ratio at 181 . From FIG. 19 , it can be confirmed that 190<191<192 and that the illuminance unevenness also decreases in the order of 190, 191, and 192 from the relative light intensity ratio value of 0.5Y which is the center of the light valve 2 in the y direction. Therefore, by forming the light-shielding bodies 9T and 9B to be bent in a "く" shape in the direction of reducing the light amount (shielding light), and forming the front end portion as a concave portion, it is possible to reduce the unevenness of illuminance.

In addition, in the embodiment of the present invention, when it is at the position of 41b in FIG. 4(b), the angle shown in FIG. Since the width of dy2 shown in FIG. 16 is further reduced, illuminance unevenness can be further reduced compared to the shape shown in FIG. 4( b ). In addition, although the light shielding bodies 9T and 9B are bent only at one place, they may be bent at two places as long as the width of dy2 shown in FIG. 16 can be reduced. In this way, unevenness in illuminance can be reduced. In addition, in FIG. 3( b ), the bending position is defined as a position near the second lens unit in the y direction centered on the optical axis C of the second lens array 4b, but it may be bent at any position.

According to the above, by forming the light-shielding bodies 9T and 9B of the rotating mechanism 9a to be bent into a "く" shape in the direction of reducing the amount of light (shielding light), and forming the front end to cut out at least one concave portion, it can be achieved. Continuous light quantity adjustment that does not cause illuminance unevenness on the light valve 2 .

<Embodiment 2>

20 is a configuration diagram of an illumination optical system 1b of a projection display device according to Embodiment 2 of the present invention. In Embodiment 2 of this invention, it is characterized in that the front-end|tip part of the light-shielding bodies 9T and 9B of the rotation mechanism 9a is formed in the shape of a blade. The configuration and operation of the other parts are the same as those of Embodiment 1, and therefore description thereof will be omitted here.

FIG. 21 is a diagram showing the rotational position of the rotational mechanism when an image is formed on the light valve according to Embodiment 2 of the present invention. Portions corresponding to Embodiment 1 are given the same reference numerals. In FIG. 22 , the arrangement positions of the shades 9T and 9B are the same as those in FIG. 15 . In addition, 210, 211, 220, and 221 all represent axes passing through the center of curvature of the second lens unit in the +y or -y direction from the optical axis C of the second lens array. As shown in FIG. 22 , the front end portions of the light shielding bodies 9T and 9B are formed such that a portion located on the optical axis C side of the shaft 220 is cut off to form a blade-shaped portion. Thus, the width of dy is reduced. In addition, the width t of the light shields 9T and 9B is usually about 0.5 mm in consideration of the strength of the light shield with respect to the rotation of the rotating mechanism 9a. 212, 222 both represent the front-end|tip part of 9 T of light shielding bodies.

Figure 23 (a) shows the simulation results of the illuminance distribution on the light valve 2 in the state shown in Figure 21 when the shape of the concave portion 9g shown in Figure 3 (a) does not exist, and Figure 23 (b) shows that there is no 3(a), the simulation results of the illuminance distribution on the light valve 2 in the state shown in FIG. 22 are obtained. Here, let t=0.5 mm. As shown in FIG. 23 , 230 a and 230 b represent areas with low illuminance, and 231 a and 231 b represent the y-axis passing through the center of the light valve 2 . Comparing 230a and 230b, it can be confirmed that the illuminance unevenness of 230b is greatly improved. Therefore, as shown in FIG. 22 , by forming the front end portions of the light-shielding bodies 9T and 9B in such a way that the portion located on the optical axis C side of the axis is cut off to form a blade-shaped portion, the unevenness of illumination can be greatly reduced, wherein the axis passes through The center of curvature of the second lens unit in the +y or -y direction from the optical axis C of the second lens array.

FIG. 24 is a graph showing relative light quantity ratios in the y direction on 231 a and 231 b which are the y axes shown in FIG. 23( a ) and FIG. 23 ( b ), respectively. As shown in FIG. 24 , 240 denotes the relative light quantity ratio at 231 a, and 241 denotes the relative light quantity ratio at 231 b. From the comparison of the relative light intensity ratio value of 0.5Y which is the center of the light valve 2 in the y direction in FIG. 24 , it can be confirmed that the illuminance unevenness of 241 is greatly reduced compared with 240 . Therefore, by forming the front end portions of the light-shielding bodies 9T and 9B so that the portion on the side of the optical axis C of the axis is cut off to be a blade-shaped portion, it is possible to greatly reduce the unevenness of illumination. The optical axis C starts from the center of curvature of the second lens unit in the +y or -y direction.

FIG. 25 is a diagram showing the shapes of the front ends of the light-shielding bodies 9T and 9B. Both 250 and 251 represent axes passing through the center of curvature of the second lens unit in the +y or -y direction from the optical axis C of the second lens array. According to FIG. 25 , it is preferable that the angles of the front ends of the light shielding bodies 9T and 9B be smaller than β.

As described above, by cutting out and forming at least one concave-shaped portion at the front end of the light-shielding bodies 9T and 9B, and cutting the front end into a blade-shaped portion, it is possible to realize a continuous light quantity that does not cause unevenness in illuminance on the light valve 2. adjust.

<Embodiment 3>

26 is a configuration diagram of an illumination optical system 1 c of a projection display device according to Embodiment 3 of the present invention. Embodiment 3 of the present invention is characterized in that the front ends of the light-shielding bodies 9T and 9B are shaped to have a small opening area, so that the contrast can be sufficiently improved without causing uneven illumination on the light valve 2 . The configuration and operation of the other parts are the same as those of Embodiment 1, and therefore description thereof will be omitted here.

The light 270 emitted from the second lens array 4b enters the light valve 2 at a relatively large incident angle. At this time, according to the characteristics of the light valve, as the angle of light incident on the light valve 2 increases, the contrast decreases (refer to FIG. 29 ), so it is preferable that the shapes of the light shields 9T and 9B can be relatively large relative to the incident angle of the light valve 2. The light, especially the incident light in the x direction is shielded.

FIG. 28 shows an example of a front view (a) and a side view (b) of the second lens array 4 b and the polarization conversion element 5 on the xy plane. Fig. 28(c) is a diagram showing Fig. 2 in more detail. Moreover, the trajectory of the light incident on the second lens array 4 b is shown in FIG. 28( c ). Here, the dotted line represents the polarization conversion element 5, and the gray represents the λ/2 retardation plate 5c. Normally, polarization conversion condenses light only in the region of the λ/2 retardation plate 5c, thereby effectively performing polarization conversion. Thus, the rays 270, 271, 272, 273, 274, 275 become rays to be polarized converted. According to FIG. 28(c), the incident p+s linearly polarized light is converted into s-polarized light by the λ/2 retardation plate 5c after the p-polarized light enters the polarization conversion element 5, so it is at the same position as the incident The x-direction position of is emitted from the polarization conversion element 5, and is emitted at a position dx (distance between 275a-275b) away from the optical axis compared with s-polarized light. Therefore, blocking the incidence of light away from the optical axis in the x-direction is indispensable for improving the contrast. That is, the light rays 270 and 275 are lights that affect the contrast. In other words, incident light at a position in the x direction close to the optical axis C is a condition for improving the contrast.

Fig. 30 shows the shapes of the light-shielding bodies 9T and 9B. The concave portions at the front ends of the light shielding bodies 9T and 9B include two concave portions 9g and 9h having different areas, and the opening area of 9g is smaller than that of 9h. Also, 9g and 9h are formed on the light-shielding bodies 9T and 9B at positions that are point-symmetrical with respect to the optical axis C when the light-shielding bodies 9T and 9B are closed.

FIG. 31 is a diagram showing a simulation calculation of the light quantity of light passing through each unit of the second lens array 4b, and a numerical value representing the calculation result for each unit. By forming the shape shown in FIG. 30 , the difference in contrast in the x direction is reduced. In addition, in FIG. 31, since the second lens array 4b is vertically symmetrical, it represents the first quadrant.

FIG. 32 is a diagram schematically showing how light emitted from the light source 3 is reflected by the reflection mirror 3b. The reflecting mirror 3b is formed as an elliptical surface, and the light emitted from the light source system 3 passes through the concave lens 310 to become parallel. In general, a bulb having a light source exists near the optical axis C, and 311 denotes an opening thereof.

As shown in FIG. 32 , 311 is an opening, so the amount of light emitted from the light source system 3 is small in the V1H1 unit shown in FIG. 31 . When light is completely shielded in the shape shown in FIG. 30 , the concave portion 9 g illuminates both ends of the light valve 2 in the x direction, and the concave portion 9 h illuminates the center of the light valve 2 . That is, a uniform illuminance distribution is formed by making the relative light quantities of light irradiated to both ends and the center of the light valve 2 in the x direction equal and overlapped. For example, when the shape of the recessed portion 9g and the recessed portion 9h are the same, as shown in FIG. 33 , the illuminance at the center of the light valve 2 becomes low, resulting in uneven illuminance. Therefore, it is necessary to make the opening area of the concave portion 9h larger than that of the concave portion 9g. In FIG. 33 , the light emitted from the concave portion 9 g irradiates the region 32 b on the light valve 2 , and the light emitted from the concave portion 9 h irradiates the region 32 a on the light valve 2 .

FIG. 34 shows the shapes of the light-shielding bodies 9T and 9B in consideration of contrast. The concave portion 9i is formed in the cell (V1H1) to form a right triangle shape opening portion, and the illuminance distribution on the light valve 2 is uniform. However, according to FIG. 31, since the amount of light passing through the unit (V1H1) is small, when 100% video signal is displayed on the screen, the image projected on the screen cannot have sufficient contrast due to the small amount of light.

From the above, in general, in order not to cause unevenness in illuminance in the light valve 2, the number of openings needs to be about 8 units. However, by considering the shape and the relative light intensity ratio incident on the opening, approximately four units can be used so that the light valve 2 does not have uneven illuminance. That is, the apex in the x direction of the concave portion 9h having a large opening area is taken as the x-direction center of the unit (V1H1) closest to the optical axis C, and the apex of the concave portion 9g with a small opening area is taken as the closest to the optical axis C The junction between the unit (V1H1) and the adjacent unit (V2H1) on the other side of the optical axis C, so that about 4 units can be used to prevent uneven illumination on the light valve 2 and improve contrast .

FIG. 35 is a graph showing the relationship between the rotation angle and the relative light quantity ratio when the shades 9T and 9B have the shapes shown in FIG. 30 . A curve 331 is a simulation result of the rotating mechanism 9a having the shape shown in FIG. 30 . A curve 330 is a simulation result of the turning mechanism 9a when the shape of the concave portion shown in FIG. 8 is not formed. For ease of comparison, curve 330 is moved to coincide with curve 331 . It can be confirmed from FIG. 35 that by forming the light shields 9T and 9B in the shapes shown in FIG. 30 , it is possible to realize substantially continuous adjustment of the light quantity of the light valve 2 with respect to the rotation angle. Therefore, by forming the front ends of the light-shielding bodies 9T and 9B as shown in FIG. 30 , continuous light quantity adjustment can be realized, and contrast can be improved without causing illuminance unevenness on the light valve 2 .

In this embodiment, an elliptical shape is illustrated, but a triangular shape can also obtain the same effect if the same opening area and apex positions as in this embodiment are considered.

Fig. 36 shows the shapes of the light-shielding bodies 9T and 9B. The concave portions at the front ends of the light shielding bodies 9T and 9B are formed in a triangular shape. The feature of the shape shown in FIG. 36 is that when the relative light quantity ratio is 30% or less, the light quantity can be finely adjusted. By arranging the concave portions 9g on both sides in the x direction of the second lens array 4b, it is possible to finely control the portion where the relative light intensity is relatively low. In addition, although the number of units used in the second lens array 4b during complete light shielding is relatively small, by forming a triangular shape as shown in FIG. Illumination unevenness will occur.

FIG. 37 is a graph showing the relationship between the rotation angle and the relative light quantity ratio when the shades 9T and 9B have the shapes shown in FIG. 36 . A curve 351 is a simulation result of the rotating mechanism 9a having the shape shown in FIG. 36 . A curve 350 is a simulation result of the rotation mechanism 9a in the shape shown in FIG. 38 . For ease of comparison, curve 350 is moved to coincide with curve 351 . From FIG. 37 , it can be confirmed that by forming the shades 9T and 9B in the shapes shown in FIG. 36 , a curve with a gentle slope is formed when the relative light quantity ratio is around 10% to 30%. The reason for forming such a gentle curve is that when the rotation angle of the rotation mechanism 9a is small, the lens unit V1H1 shown in FIG. 31 is shielded from light, so that the variation in illuminance can be reduced. In the relatively low range of 10% to 30% of the relative light quantity ratio, the sensitivity of human vision to changes in the relative light quantity ratio is very high, so it is important to finely adjust the light quantity by the rotating mechanism 9a. Therefore, by forming the shape shown in FIG. 36 , it is possible to finely control the light quantity adjustment when the relative light quantity ratio is less than 30%.

As described above, by forming the light-shielding bodies 9T and 9B in the shapes shown in FIG. 36 , it is possible to finely adjust the light quantity even when the relative light quantity is relatively low.

Claims (17)

1. a projection display device is characterized in that, this projection display device has:

Light valve;

Light source, its generation shines the light on the described light valve;

Integration lens, it is configured on the light path between described light source and the described light valve, the Illumination Distribution homogenising of the light on making from described light source irradiation to described light valve; With

Light intensity adjusting mechanism, it is configured on the described light path, has a pair of occulter that rotates in the mode that splits around door, the light quantity of the light on this a pair of occulter is used to regulate from described light source irradiation to described light valve,

Described occulter forms and be bent into " く " shape on the direction that light quantity is reduced.

2. projection display device according to claim 1 is characterized in that described occulter forms leading section and is cut into concavity portion.

3. projection display device according to claim 1 and 2 is characterized in that, described occulter forms leading section and is cut into tooth shape shape portion.

4. a projection display device is characterized in that, this projection display device has:

Light valve;

Light source, its generation shines the light on the described light valve;

Integration lens, it is configured on the light path between described light source and the described light valve, the Illumination Distribution homogenising of the light on making from described light source irradiation to described light valve; With

Light intensity adjusting mechanism, it is configured on the described light path, has a pair of occulter that rotates in the mode that splits around door, the light quantity of the light on this a pair of occulter is used to regulate from described light source irradiation to described light valve,

Described occulter forms leading section and is cut into tooth shape shape portion.

5. projection display device according to claim 4 is characterized in that described occulter forms leading section and is cut into concavity portion.

6. according to claim 1 or 4 described projection display devices, it is characterized in that described integration lens is made of first lens arra of being located at described light source side and second lens arra of being located at described light valve side,

Described occulter is configured between described first lens arra and described second lens arra, and rotates in the direction that opens and closes towards described first lens arra.

7. projection display device according to claim 6 is characterized in that, the rotation axis of described occulter and is configured near described second lens arra between described first lens arra and described second lens arra.

8. according to claim 1 or 4 described projection display devices, it is characterized in that the size of two radius of gyration directions of described a pair of occulter is greater than the size of described integration lens.

9. according to claim 2 or 5 described projection display devices, it is characterized in that described concavity portion forms the concavity curve shape.

10. according to claim 2 or 5 described projection display devices, it is characterized in that described concavity portion forms parabolic shape.

11., it is characterized in that described concavity portion forms half-oval shaped according to claim 2 or 5 described projection display devices.

12., it is characterized in that described concavity portion forms triangle according to claim 2 or 5 described projection display devices.

13., it is characterized in that described concavity portion is formed with a plurality of according to claim 2 or 5 described projection display devices on described occulter.

14. projection display device according to claim 13, it is characterized in that, described concavity portion comprises two concavity portions that area is different, and these two concavity portions are formed on each described occulter, and is located at described occulter point-symmetric position of relative optical axis when closed.

15. projection display device according to claim 14, it is characterized in that, in the xyz of following hypothesis coordinate system, this coordinate system is by constituting as the x axle of horizontal direction and the y axle as vertical direction of relative described z axle and described x axle quadrature as the z axle of described optical axis direction, described relatively z axle quadrature, in the described concavity of different two of area portion

The summit of the described concavity portion of aperture area the greater is positioned at the y direction of principal axis at lens unit center, this lens unit is arranged in described second lens arra x direction of principal axis of approaching described optical axis, the summit of aperture area smaller's described concavity portion is positioned at the y direction of principal axis of connecting portion, to another lens unit, this another lens unit is on the x axle and in the side opposite with described lens unit of described optical axis from described lens unit for this connecting portion.

16. a projection display device is characterized in that, this projection display device has:

Light valve;

Light source, its generation shines the light on the described light valve;

Integration lens, it is configured on the light path between described light source and the described light valve, the Illumination Distribution homogenising of the light on making from described light source irradiation to described light valve; With

Light intensity adjusting mechanism, it is configured on the described light path, has a pair of occulter that rotates in the mode that splits around door, the light quantity of the light on this a pair of occulter is used to regulate from described light source irradiation to described light valve,

Described occulter forms the concavity portion that leading section is cut into the concavity curve shape, described concavity portion comprises two concavity portions that area is different, these two concavity portions are formed on the described occulter, and are located at the described occulter point-symmetric position of relative optical axis when closed.

17. projection display device according to claim 16, it is characterized in that, in the xyz of following hypothesis coordinate system, this coordinate system is by constituting as the x axle of horizontal direction and the y axle as vertical direction of relative described z axle and described x axle quadrature as the z axle of described optical axis direction, described relatively z axle quadrature, in the described concavity of different two of area portion

The summit of the described concavity portion of aperture area the greater is positioned at the y direction of principal axis at lens unit center, this lens unit is arranged in described second lens arra x direction of principal axis of approaching described optical axis, the summit of aperture area smaller's described concavity portion is positioned at the y direction of principal axis of connecting portion, to another lens unit, this another lens unit is on the x axle and in the side opposite with described lens unit of described optical axis from described lens unit for this connecting portion.

Images