JP4846337B2 - Light amount adjusting device and projector device provided with the same - Google Patents

Description

  The present invention relates to a light amount adjustment device that is incorporated in a photographing device such as a still camera or a video camera, or a projector device, and adjusts the light amount of photographing light or projection light, and a projector device using the same. Light amount diaphragm device that is arranged in the projection optical path and restricts the amount of light passing through the optical path to an appropriate photographing light amount with a blade member, or a shutter device that shields the amount of light passing through the optical path, or an aperture that also blocks after restricting the amount of light The present invention relates to a support structure for a light amount adjusting blade member in a light amount adjusting device such as a shutter device.

  In general, this type of light amount adjusting device is configured such that one or a plurality of blade members are slidably disposed on a substrate disposed in an optical path of an imaging device, a projector device, etc., and this blade member is driven by a driving means such as a drive motor. Thus, the optical path opening formed in the substrate is opened and closed by moving in the linear direction or the rotational direction. And when restricting the amount of light in the optical path as a diaphragm device, the diameter of the blade member covering the optical path opening is changed to be large or small, the amount of light passing through the optical path is adjusted, and the amount of light in the optical path is shielded as a shutter device The blade member is configured to open and close between an open position where the blade member is retracted from the optical path opening and a closed position covering the optical path opening.

  In addition, as a diaphragm / shutter device, the blade member is caused to face the optical path opening at a predetermined position corresponding to the photographing condition and the projection condition, the passing light amount is regulated, and the blade member is moved to a position covering the optical path opening to release the shutter. It is configured to operate.

  As such a light quantity adjusting device, a substrate constituting a unit frame is arranged in an optical path, an optical path opening is provided in the substrate, a blade member that opens and closes the optical path opening, and a drive motor that opens and closes the blade member. The attached unit structure is widely known. In this case, there are a structure in which the blade member is pivotally supported on the substrate so as to be rotatable, and a structure in which the blade member is slidably supported in a linear direction with respect to the optical path opening. Are known. The substrate is formed in a flat shape by molding with a synthetic resin, and the blade member is used as a general processing method by stamping and molding a resin film or a thin metal plate into an appropriate shape.

The present invention relates to a structure in which a blade member is slidably supported in a linear direction on a substrate on which the optical path opening is formed.

  Conventionally, as such a blade support structure, a guide pin is integrally formed on the substrate, and a slit hole formed in the blade member is fitted to the guide pin to support the blade member so as to be reciprocally movable in a linear direction. For example, it is disclosed by patent document 1 (FIG. 1). In this document, a pair of blade members as a diaphragm device are supported by pin-slit engagement so as to be movable in a linear direction with respect to the optical path opening. What is configured to move in the direction is disclosed. Each blade member is provided with slit grooves on both sides of the optical axis opening, and pin members implanted in the substrate are fitted into the slit grooves and supported so as to be movable in the linear direction. Such a blade structure is generally employed as a light amount adjusting device for a photographing device such as a camera, and a punched product such as a plastic film is used as the blade member.

  On the other hand, as a rear projection television, a display device for enlarging and projecting an image formed on a liquid crystal or other image forming panel from the back side on a screen screen has recently been widely used, and this kind of projection light quantity is used for indoor lightness (brightness) or image brightness. As a light amount adjusting device that adjusts the light amount according to the change, the light amount is appropriately adjusted under high temperature (around 200 degrees C in a normal rear projection television) due to the influence of the light source and the like. High speed opening and closing such as 1 second and downsizing of the device have been required.

  Under such conditions where high temperature, high speed, and miniaturization are required, the blade member may be deformed by temperature change in the synthetic resin. Even if the blade member is made of a thin metal plate such as an aluminum alloy or stainless steel, A site where the slit groove is formed may be distorted and deformed in a temperature environment, and a stable and smooth opening / closing operation cannot be obtained.

  Therefore, the present applicant tried to improve the blade structure shown in FIGS. In the conventional blade structure, the portion where the slit groove is formed is distorted due to the environmental temperature, and in the metal blade, the groove edge causes wear of the pin member and hinders the movement of the blade, which is shown in FIG. Thus, when forming a blade | wing, a bending edge is formed by a drawing process (burring process) in the slit periphery. That is, as shown in FIG. 9, slit members 215 and 225 of blade members 210 and 220 that are slidably fitted to guide pins 110 and 120 of substrate 100 as shown in FIG. At the time of drawing, a bending edge was formed by drawing, and an attempt was made to increase durability by increasing the contact area when fitting the guide pins 110 and 120 with the bending edge. In this case, there is a disadvantage that the space for drawing the slits 215 and 225 further increases and the entire apparatus becomes large.

Japanese Utility Model Publication No. 7-14978 (FIG. 1)

When one or two blade members are slidably supported in a linear direction on a substrate having an optical path opening as described above, a slit groove is provided in the blade member as disclosed in Patent Document 1. In a structure that fits and supports the pin member implanted in the substrate, a narrow narrow portion is formed in the blade member to form the slit groove, and this portion is distorted by an external force such as temperature or impact. Deformation of this part may hinder smooth movement of the blade member. In this case, as shown in FIG. 7, it may be possible to prevent the partial deformation of the slit groove formed on the blade member by burring, but the blade member forming the slit groove moves regardless of the structure. There is a disadvantage that the momentum device must be wide and large in size in a width direction that is orthogonal to the direction in which the force is applied.

  Therefore, the present invention is less likely to deform the blade member that adjusts the amount of light even in a high-temperature device environment such as a projector device, and supports the blade member so as to reciprocate in a linear direction. The main object is to provide a light quantity adjusting device that is simple and small-sized, and particularly capable of reducing the size in the width direction perpendicular to the moving direction of the blade member itself.

  Furthermore, in the present invention, when the blade member is composed of a thin metal plate having a small temperature change, when the blade member is guided in the reciprocating direction with a substrate such as a rigid resin, the rattling is less likely to occur due to wear during use. It is an object of the present invention to provide a light amount adjusting device and a projector device that are less likely to cause sticking and have an unstable opening / closing motion.

The present invention adopts the following configuration in order to solve the above problems.
For example, a flat plate-like substrate having an optical path opening is formed of synthetic resin or the like, and at least one blade member that opens and closes the optical path opening and driving means that opens and closes the blade member are attached to the substrate. The blade guide means for reciprocally supporting the blade member is formed on the side edge guide surface formed along the linear movement direction of the blade member on both side end surfaces of the substrate and on both side edges or one side edge of the blade member. The folding engagement piece of the blade member is engaged with the side edge guide surface, and the blade member is slidably supported on the substrate by a holding plate. As a result, the blade member bends both side edges of a thin plate such as a metal plate into, for example, a bowl shape, and the end surface of the blade member comes into contact with and engages with the side edge guide surface formed on the side end surface of the substrate. The apparatus is guided by the edge guide surface and reciprocates in the linear direction, so that the apparatus can be reduced in size and space can be saved without requiring special guide guide means such as a slit groove.

  When the blade member is a thin metal plate, the bent engagement pieces provided on both sides of the blade are easily deformed, and the side edge guide surface provided on the substrate may not be reliably engaged. is there. In this case, the configuration of claim 2 is adopted. In other words, bent pieces are provided on both side edges of the presser plate formed of a thicker and more rigid metal plate than the blade member, and the bent engagement pieces of the blade member engaged with the side edge guide surfaces are sandwiched between the bent pieces. Hold it. As a result, even if the folding engagement piece of the blade member is a soft and easily deformable material, it is held in a sandwich shape between the side edge guide surface of the substrate and the bending piece of the holding plate and is not deformed.

  When the light quantity adjusting device having such a configuration is incorporated into a high-temperature device such as a projector device, the blade member is preferably made of a metal material, the substrate is made of a resin material, and the presser plate is made of a metal material. For example, the blade member and the pressing plate are each formed by stamping an aluminum alloy, stainless steel or other metal thin plate by press working, and the substrate is molded by a synthetic resin material. As a result, the substrate can be easily processed as a base frame on which a driving means such as a blade member or a drive motor is mounted, and the blade member and the holding plate are metal plates that are resistant to heat or external impact, and the processing is easily formed by press processing. It will be possible. In this case, it is preferable that the blade member is made of a thin plate and light in weight so that the opening and closing operation can be performed at high speed, and the presser plate is made of a thick plate that can withstand external impact.

  Further, the blade member is composed of a pair of blade members that reciprocally move in a reciprocal direction between a retracted position (open position) retracted from the optical path opening and an entry position (closed position) that entered the optical path opening. Is common. In this case, the substrate and the pressing plate are provided with protrusions that support the front and back of the pair of blade members, and a height difference is formed on the protrusions so that the blade members are overlapped without interfering with each other.

  Further, a projector apparatus according to the present invention includes a light source, an image forming unit that forms an image by light from the light source, a projection unit that projects an image formed by the image forming unit on a screen, and the light source. A light amount adjusting device that is disposed in an optical path to the projection unit and adjusts the light amount in the optical path. And this light quantity adjustment apparatus is comprised by the above-mentioned structure. As a result, even if the temperature inside the projector apparatus becomes high due to the influence of heat from the light source, for example, the blade member does not easily deform and can be incorporated into the apparatus as a unit with a small configuration.

  According to the present invention, when one or more blade members are translated in a linear direction on a substrate having an optical path opening to open and close the optical path opening, bent engagement pieces formed on both side edges of the blade member are arranged on both side end surfaces of the substrate. Since both of the blade guide means are configured to abut and engage with the side edge guide surface formed along the linear movement direction of the blade to restrict the movement of the blade member, the blade bending engagement piece The contact area between the substrate and the side edge guide surface of the substrate is large, and the movement is smoother and smoother than the conventional case where the blade slit and the pin member of the substrate are engaged. At the same time, since the blade member is provided with a bent engagement piece whose both side edges or one side edge is bent, it is not easily deformed by environmental temperature or external impact. In addition, the blade member arranged on the base does not need to be provided with a guide means such as a slit for restricting its opening and closing movement on the plane where the optical path opening is located, and it is possible to suppress the dimension in the direction perpendicular to the movement of the blade. The device can be miniaturized.

  Further, according to the present invention, the blade member is made of a thin metal plate that does not deform at ambient temperature, and its mass is reduced, and the folding engagement pieces of the blade joined to the side edge guide surface of the substrate side end surface are formed on both side edges of the presser plate. By adopting a configuration in which the blade member is sandwiched between the bent pieces, even if the blade member is formed of a thin metal plate, the blade member is securely engaged with the side edge guide surface of the substrate without being loosened, and a stable opening / closing operation can be obtained. .

  The present invention will be described in detail below based on the illustrated embodiment. FIG. 1 is a schematic configuration diagram showing a configuration of a projector apparatus incorporating a light amount adjusting device adopting the present invention, FIG. 2 is an exploded perspective view in which a blade member is incorporated in a substrate constituting the light amount adjusting device, and FIG. Are respectively exploded perspective views in which drive motors (drive means) are incorporated.

  In general, the projector device is connected to an image output unit of a computer, and receives an RGB signal from this to project an image on a screen. Alternatively, it is connected to an output unit of a DVD player, obtains a component signal from this, and projects an image on a screen. It is also connected to a TV tuner, and from there it receives a high-definition signal, a video signal, etc. and projects the image on a screen. Various types of such projector apparatuses are known as image forming methods. As an example, FIG. 1 shows a layout configuration when a liquid crystal panel method is used.

  In FIG. 1, H is a projector device, and S is a screen for projecting an image. The projector H includes a light source unit, an image forming unit, and a light projecting unit. The projector H irradiates light from the light source onto the image forming unit, irradiates light on the image formed on the image forming unit, and projects the light from the light projecting unit onto the screen. It is configured to project.

  The light projecting part A includes a light source 1 and uses a light source lamp such as a metal halide lamp, a high-pressure mercury lamp, an NSH lamp, a xenon lamp, or a VIP lamp. The light emitted from the light source 1 is reflected as almost parallel light by the reflecting mirror 2 on the object surface. For example, harmful infrared rays and ultraviolet rays are cut by a filter 3 formed of an integrator lens which is a kind of lens array, and then described later. The light amount is adjusted to an optimum brightness by the light amount adjusting device E. Thereafter, the light passes through the integrator lens 4 that improves the light collection efficiency and the peripheral light amount ratio to the liquid crystal panel, and is bent at a substantially right angle by the reflection mirror 12a. This light is branched into R, G, and B primary colors by the spectroscopic mirror. First, the B light reflected and separated by the dichroic mirror 10a having the characteristic of transmitting only the G light and the R light and reflecting only the B light is further The image forming means, which is guided to the condensing lens 5a through the reflecting mirror 12b and condensed into parallel light, is configured to pass through the liquid crystal panel 8a and reach the combining prism 11 as an image of B light. .

  The G light and R light transmitted through the first stage dichroic mirror 10a are reflected and separated by the second stage dichroic mirror 10b having a characteristic of transmitting R light and reflecting G light. The light is condensed into parallel light by the lens 5b, passes through the liquid crystal panel 8b, and reaches the combining prism 11 as an image of G light. Further, the R light transmitted through the second stage dichroic mirror 10b is guided to the condensing lens 5c via the two reflecting mirrors 12c and 12d, is condensed into parallel light, and is transmitted through the liquid crystal panel 8c to be an image of the R light. To the synthesis prism 11. Therefore, the R, G, and B primary colors are combined into one by the combining prism 11 and guided to the projection lens 9 as a color image. The projection lens 9 constitutes a projection unit and is projected onto the front screen S.

  Further, a part of the light that has passed through the light amount adjusting device E is split by a half mirror (or dichroic mirror) 150, and the light is received by a light sensor (for example, a photodiode) 170 through a condenser lens 160. Then, the light amount adjustment device E is controlled by a light amount adjustment circuit (not shown) by an output signal of the optical sensor (for example, a photodiode) 170 to perform appropriate light amount adjustment.

  The light amount adjusting device E is disposed between the light source 1 and the integrator lens 4 as described above, or is incorporated in the lens array constituting the projection lens 9, or in the optical path from the light source to the light transmitting portion. The next light quantity adjustment is performed. First, when adjusting the amount of light according to the environment in which the device is used, a detection sensor such as a photo sensor that detects the brightness of the usage environment such as a room is provided, and the amount of light adjustment device according to the brightness of the room light detected by this sensor E is controlled. Further, when performing contrast adjustment or brightness adjustment according to luminance change for each frame of the image, the brightness (luminance) for each image (frame) is extracted from the image data transferred to the liquid crystal panel 8 and projected. Data, contrast, and correction values for luminance change are calculated, and the light amount adjusting device E is adjusted according to the calculation results.

  Next, the light amount adjusting device E will be described. The illustrated light amount adjusting device E includes a substrate 60, a blade member 80, a pressing plate 90, and a driving motor 10 (driving means; the same applies hereinafter). As shown in FIG. 2, the flat plate-like substrate 60 has first and second blade members 81 and 85 incorporated in the plane (upper surface of FIG. 2), and a presser plate 90 is overlaid from above the blade member, The drive motor 10 is attached to the back side of the substrate 60 as shown in FIG. As described above, the light amount adjusting device H is configured as the light amount adjusting unit 50.

  The substrate 60 is formed into a flat plate shape by molding of synthetic resin or the like, and has a flat surface with a step difference from the optical path opening 61 and the plane (right side in FIG. 2; hereinafter referred to as blade support surface) in which the optical path opening is formed ( The left side of FIG. 2; hereinafter referred to as a drive device mounting portion) is formed in an elongated rectangular shape as a whole so that a transmission arm 70 of the drive motor 10 described later is disposed. A flange wall 69 is formed around the substrate 60, and rib-like protrusions 64 and 63 are formed on the blade support surface. A protruding portion illustrated by 63 is a guide rib that supports the first blade member 81, and a protruding portion illustrated by 64 is a guide rib that supports the second blade member 85. A step corresponding to the thickness of the blade member is formed in the guide ribs 63 and 64, and the guide rib 64 supporting the second blade member 85 is at least as much as the thickness of the blade with respect to the guide rib 63 supporting the first blade member 81. Highly formed. This is to support the first blade member 81 at a low position and the second blade member 85 at a high position so that the second blade members superimposed on the first blade member do not interfere with each other. Further, a through-hole 62 through which a rotating shaft 13 of the drive motor 10 described later is inserted is formed in the drive device mounting portion of the substrate. Then, after the first and second blade members 80 are mounted on the guide rib and assembled, the presser plate 90 is overlaid and supported on the flange wall 69.

  Side edge guide surfaces 65 and 67 are formed on the both sides of the substrate 60 thus configured along the moving direction of the blades. The illustrated side edge guide surface is formed of a rail-like protruding wall, and the left side edge guide surface 65 and the right side edge guide surface 67 are disposed on the left and right side end surfaces of the substrate 60. 66 and 68 shown in the figure are projection claws for locking a presser plate 90 described later.

  Next, the blade member 80 will be described. The blade member that performs the light amount diaphragm operation for adjusting the opening diameter of the optical path opening 61 formed on the substrate or the shutter operation for shielding the optical path opening is one or a plurality of blade members. Composed. The illustrated one illustrates a diaphragm device that performs a diaphragm operation with the first and second blade members. The first blade member 81 is made of a plate-like material having a substantially semicircular aperture opening edge 82 and is supported by the guide rib 63 of the substrate 60 in the left-right direction in FIG. 2, and similarly, the second blade member 85 also has an aperture opening edge. It is made of a plate-like material having 86 and is supported by guide ribs 64. The diaphragm opening edges 82 and 86 are arranged to face each other so as to form a half-moon shaped opening diameter in the center. The first and second blade members are formed of a metal plate corresponding to the apparatus specifications such as aluminum alloy and stainless steel, and the first blade member is in contact with and engaged with the right edge guide surface 67 formed on the substrate 60 described above. A bending engagement piece 84 is provided.

  The second blade member 85 is formed with a bent engagement piece 88 that abuts and engages with the left edge guide surface 65. As described above, the folding engagement pieces 84 and 88 are formed on the side edges of the blade members 81 and 85 so that the portions of the blade members that form the opening edges 82 and 86 are not deformed due to the environmental temperature or the like. This is to increase the second moment of section. Accordingly, each blade member has a shape that is difficult to be deformed by temperature, external impact, etc., and at the same time, each of the bending engagement pieces 84 and 88 is abutted and supported by the left and right edge guide surfaces 65 and 67 of the substrate, and along this guide surface. It is guided so as to be movable in a straight line direction. The first and second blade members 80 can be integrally formed with an outer shape, a diaphragm opening edge, and a bent engagement piece by, for example, stamping and forming a thin metal plate.

  Next, the structure of the presser plate 90 will be described. The presser plate 90 is formed in substantially the same shape as the substrate 60 and is connected to the flange wall 69 of the substrate. The opening 91 is provided at a position that coincides with the optical path opening 61 of the substrate. The opening 61 is formed to have the same diameter as the optical path opening 61 or a slightly larger diameter. A guide rib 93 is formed at the periphery of the opening 61 at a position facing the guide rib 63 formed on the substrate 60, and a guide rib 94 is formed at a position facing the guide rib 64. It is provided. Both guide ribs of the holding plate are formed to have a height difference, the guide rib 93 abuts and supports the first blade member 81 at a high position, and the guide rib 94 supports the second blade member 85 at a low position. It has become. 92a and 92b shown in the figure are escape grooves of a transmission pin 73 of the transmission arm 70 described later.

  Folding pieces 99a and 99b are formed on both side portions of the left and right sides of the presser plate 90 thus configured, and the bent pieces on the left and right side portions are side edge guide surfaces formed on the substrate 60. It is formed at a position facing 65 and 67. Positioning pieces 97 and 98 are bent at the side edges of the presser plate 90, and the positioning pieces engage with positioning notches (see FIG. 2) formed on the substrate. Further, on the left and right side edges of the presser plate 90, connecting pieces 95, 96 having fitting holes for fitting with the projection claws 66, 68 formed on the substrate are bent. Therefore, if the holding plate 90 is combined so that it matches the flange wall 69 of the substrate 90, the positioning pieces 97 and 98 are positioned by the notches, and the connecting pieces 95 and 96 and the projection claws 66 and 67 are fitted to each other. Integrated.

  Next, the drive motor 10 will be described. As shown in FIG. 3, a rotor 11 comprising a hollow cylindrical magnet 12 and a rotary shaft 13 fitted in the hollow portion, and a rotor 11 that wraps and supports the rotor 11 in a rotatable manner. Two upper and lower coil frames 14 and 15 for winding a conductive coil (not shown), a terminal 16 for energizing the conductive coil, a yoke 17 for forming a magnetic circuit with the rotor 11, and an insulation through which the terminal 16 penetrates. It comprises a board 18 and a printed board 19 that connects the terminals 16 to an external power source.

  As shown in FIG. 2, the transmission arm set 70 is disposed on the front and back surfaces of the substrate through the through hole 62 of the substrate. The transmission arm set 70 includes an arm 71, a mounting boss 72 attached to the rotary shaft 13 of the drive motor 10 protruding from the through hole 62 of the substrate 60 at the central portion of the arm 71, and protruding upward at both ends of the arm 71. The transmission pins 73, 73 and the mounting boss 72 are wound around the outer periphery, one end is stretched to the arm 71 and the other end is stretched to the side end of the substrate 60, so that the transmission arm 70 is always in the clockwise direction (blade member closing direction). A spring 74 that urges the rotation is provided. The pair of transmission pins 73 formed on the left and right sides of the arm 71 are fitted in the slit hole 83 formed in the first blade member 81 and the slit hole 87 formed in the second blade member 85, respectively. Accordingly, the first and second blade members are moved in the opposite directions by the swinging motion of the arm 71, and the motion becomes a linear motion along the side edge guide surfaces 65 and 67. The side edge guide surfaces 65 and 67 and the bent engagement pieces 84 and 88 constitute blade guide means.

  The light quantity adjustment unit 50 described above constitutes a structure as shown in a sectional view in FIG. 4 will be described in accordance with FIG. 4, in which the light quantity adjustment unit 50 shown in FIG. 3 is assembled, not a cross-section cut in a direction perpendicular to the longitudinal direction, but the positional relationship of each component. It is explanatory drawing which shows the cross section which cut and synthesized several places in order to do. In FIG. 4, members denoted by the same reference numerals as those in FIG. In particular, the first blade member 81 has at least three locations parallel to the reference plane of the substrate 60 by the first guide rib 63 with a low protrusion amount of the substrate 60 and the third guide rib 93 with a high protrusion amount of the holding plate 90. The second blade member 85 is supported with respect to the reference plane of the substrate 60 by the second guide rib 64 having a high protrusion amount of the substrate 60 and the fourth guide rib 94 having a low protrusion amount of the holding plate 90. At least three places (not shown) are supported so as to be parallel to each other and spaced apart from each other with a certain gap so that sliding friction is reduced and smooth operation is possible.

  Further, as shown in an exploded perspective view in FIG. 5, the bent engagement piece 84 of the first blade member 81 abuts on the side edge guide surface 67 protruding from the both end surfaces of the substrate 60, and this side edge guide. The bending engagement piece 88 of the second blade member 85 abuts on the side edge guide surface 65 opposite to the guide surface 65, and is slidably guided in the direction of the guide surface. The illustrated structure has a structure in which the bent engagement piece is easily deformed by an external force because the blade member is formed of a metal plate having a thickness that does not deform by heat and has a small mass.

  Therefore, the folding engagement pieces of the blades are sandwiched from outside by the folding pieces 99a and 99b formed on the holding plate 90 described above. As a result, the folding engagement pieces of the blade members are sandwiched between the side edge guide surfaces and the bending pieces of the holding plate 90 and protected so as not to be deformed by an external force such as an impact.

  Since the bending engagement pieces 84 and 88 formed on the blade member 80 are supported by being sandwiched between the side edge guide surface of the substrate and the bending piece of the presser plate as described above, as shown in FIG. Compared with the apparatus, the illustrated dimension L in the width direction can be reduced, and the entire apparatus can be configured compactly. At the same time, the blade member 80 can be held in a cantilevered manner by a bent engagement piece formed on one side thereof, and the device can be further downsized simultaneously with the downsizing of the blade member.

  In the present invention, the blade member 80 shown in FIG. 2 shows the case where the bent engagement pieces are formed on one side edge. However, the bent engagement pieces may be formed on both side surfaces of the blade member. Of course it is good.

1 is a schematic configuration diagram of a projector device according to an embodiment of the present invention. The disassembled perspective view of the light quantity adjustment apparatus concerning this invention built in the apparatus of FIG. FIG. 3 is an exploded perspective view of a drive motor incorporated in the substrate of the apparatus of FIG. 2. Cross-sectional explanatory drawing of the light quantity adjustment apparatus of FIG. The principal part expansion disassembled perspective view of the apparatus of FIG. FIG. 8 is an explanatory diagram for comparing the sizes of the light amount adjusting device of FIG. 2 and the device of FIG. 7 according to the present invention. The disassembled perspective view of the apparatus structure preceding this invention. Sectional explanatory drawing of the apparatus structure of FIG.

Explanation of symbols

H Projector device E Light amount adjusting device 8 Image forming means 9 Projection lens (projection means)
DESCRIPTION OF SYMBOLS 10 Drive motor 50 Light quantity adjustment unit 60 Substrate 61 Optical path opening 65, 67 Side edge guide surface 70 Transmission arm 80 Blade member 81 First blade member 84 Folding engagement piece 85 (of the first blade member) Second blade member 88 ( Bending engagement piece 90 of second blade member Presser plate

Claims (6)

A flat plate-like substrate having an optical path opening;
At least one blade member attached to the substrate for opening and closing the optical path opening;
Blade guide means provided on the substrate for guiding the blade member movably in a linear direction;
Drive means for reciprocating the blade member in a linear direction along the blade guide means;
A presser plate that holds the blade member on the substrate;
The blade guide means is
Side edge guide surfaces formed along the linear movement direction of the blade member on both side end surfaces of the substrate;
A folding engagement piece formed on both side edges or one side edge of the blade member,
A light quantity adjusting device characterized in that a bending engagement piece of the blade member is engaged with the side edge guide surface, and the blade member is slidably supported on the substrate by the pressing plate. The holding plate is provided with bent pieces on both side edges, and the bent pieces hold the bent engagement pieces of the blade member engaged with the side edge guide surfaces between the side edge guide surfaces. The light amount adjusting device according to claim 1, wherein the light amount adjusting device is formed so as to do so. The blade member is made of a metal material, the substrate is made of a resin material, and the holding plate is made of a metal material,
The blade member and the presser plate are each formed by stamping an aluminum alloy, stainless steel or other metal thin plate by pressing,
The light quantity adjusting device according to claim 1, wherein the substrate is molded with a synthetic resin material. The said blade member is comprised by a pair of blade member which reciprocates in the opposite direction between the retreat position retracted | saved from the said optical path opening, and the approach position which approached this optical path opening. 4. The light amount adjusting device according to any one of items 1 to 3. The substrate and the presser plate are respectively formed with protrusions that support the front and back of the pair of blade members, and the protrusions have a height difference that guides the pair of blade members to overlap. The light quantity adjusting device according to any one of claims 1 to 4. A light source;
Image forming means for forming an image with light from the light source;
Projection means for projecting the image formed by the image forming means on a screen;
A light amount adjusting device that is disposed in an optical path from the light source to the projection unit and adjusts the light amount in the optical path,
6. A projector apparatus comprising the light quantity adjusting device having the structure according to claim 1.

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