JP2006189467A - Light quantity control device and projector apparatus using the same - Google Patents

Light quantity control device and projector apparatus using the same Download PDF

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Publication number
JP2006189467A
JP2006189467A JP2004381490A JP2004381490A JP2006189467A JP 2006189467 A JP2006189467 A JP 2006189467A JP 2004381490 A JP2004381490 A JP 2004381490A JP 2004381490 A JP2004381490 A JP 2004381490A JP 2006189467 A JP2006189467 A JP 2006189467A
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light
means
light quantity
image forming
blade
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Pending
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JP2004381490A
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Japanese (ja)
Inventor
Masahide Shirasu
Sumio Takeuchi
雅秀 白須
澄男 竹内
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Nisca Corp
ニスカ株式会社
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Priority to JP2004381490A priority Critical patent/JP2006189467A/en
Publication of JP2006189467A publication Critical patent/JP2006189467A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a light quantity control device which is improved in durability of attaining a stable light quantity control over a long period, and also, which is with less discomfort feeling such as noise, and to provide a projector apparatus that uses the light quantity control device. <P>SOLUTION: The light quantity controller arranged in an optical path for irradiating a liquid crystal panel, a DLP (digital light processor) and other image forming means with light emitted from a light source has the constitution: a substrate, equipped with an optical path aperture, is arranged between the light source and the image forming means, one or a plurality of light quantity control blades are attached rotatably and slidably to the substrate so as to open/close the optical path aperture while adjusting the size of the aperture diameter, and an electromagnetic drive means is connected to the light quantity blade, and a control means for supplying a control current to the electromagnetic drive means is arranged. A sensor means, for distinguishing the presence a person in an area for observing the projected image obtained by projecting the light from the image forming means by the projecting means, is arranged. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a light amount adjusting device for adjusting the brightness of an image when irradiating light from a light source onto an image formed by an image forming means such as a cathode ray tube or a liquid crystal panel and projecting the image on a screen with a light projecting lens or the like. The present invention relates to a so-called projector apparatus such as a front projector and a rear projection TV.

  In general, this type of projection apparatus forms images such as characters and images on an image forming unit such as a cathode ray tube (CRT) or a liquid crystal panel, irradiates light from a light source such as a halogen lamp, and projects it onto a screen with a projection lens. It is widely known as a device to perform. It is used for various presentations by projecting still images such as character images on a screen, or as a home theater or the like for projecting moving images such as images on a screen. Whether it is a bright room or a dark room, whether it is used for presentation or video viewing, the effect on the viewer's vision is large. For example, it is clear that the brightness of the image is low in a bright room. An image is not obtained, and conversely, if the brightness is high in a dark room, it feels dazzling. At the same time, if a large luminance change is repeated for a long time, for example, the luminance of an image that changes sequentially changes from a dark screen to a bright screen, there is a risk of eye fatigue or optical stimulation.

  Therefore, it is necessary to adjust the brightness of the image projected on the screen appropriately. It is easy for the user to adjust the light amount to be small when projecting in a dark room and to increase the light amount in a bright room. In addition, when the image changes sharply, it is necessary to adjust the amount of light for each screen so as to reduce the stimulus given to the eyes of the user. Further, even in a dark scene, by reducing the amount of light and lowering the black level, improvement in contrast is required so that black becomes black.

  Conventionally, in order to adjust the amount of light, for example, as disclosed in Patent Document 1, light from a light source is split into R, G, and B primary colors by a dichroic mirror and irradiated to an image forming panel such as a liquid crystal. In addition, a light quantity stop device is disposed between the light source and the dichroic mirror. The projector apparatus of the patent document splits light from a light source lamp into R, G, and B primary colors using a spectroscope such as a dichroic mirror, and irradiates the image forming panel composed of a liquid crystal panel with each of the three primary colors and passes through the panel. The collected light is condensed and projected onto an external screen by a projection lens. As an image forming means, a method of emitting a scanning line with a cathode ray tube other than a liquid crystal panel (CRT projector) or a digital image method of converting R, G, B3 primary color beam light into scanning light with a fine mirror surface (digital light) Processing projectors) are known.

  Further, although the light quantity diaphragm device is not disclosed in the same document, in an optical device such as a camera device, a substrate having an aperture (optical path aperture) in which the optical axis center coincides with the optical path from the light source to the imaging unit, A plurality of blades are sequentially stacked on the periphery of the optical path opening of the substrate, and each blade is rotatably arranged. The contour edges of each blade are attached to the periphery of the optical path opening at a predetermined interval so as to overlap each other in a scale-like manner, and are arranged so that the leading end of each blade faces the optical path opening, and each blade is centered on the base end portion. A structure in which the tip covers the optical path opening from a large diameter to a small diameter when rotated is widely known.

  In this way, the blade member with the distal end facing the optical path opening is rotatably supported on the base plate by a pin or the like, and is connected to the drive motor by the transmission member. Various types of drive motors are known. An exciting coil is wound around the outer circumference of the magnet rotor, and a current is supplied to this coil to rotate the rotor by a predetermined angle. Transmission structures are widely used.

Therefore, the light amount is adjusted by detecting the brightness of the external environment with a photoelectric sensor, calculating the brightness as a reference of the projected image based on the detected value, and then detecting the position of the blade member. For the position detection of the blade member, for example, a position sensor that detects the magnetic pole of the magnet rotor with a Hall sensor is used. Then, an appropriate position (aperture position) of the blade member is calculated and the blade is operated in the opening direction or is operated in the closing direction. Conventionally, the power supply circuit to the exciting coil applies a predetermined current to the coil at a predetermined voltage, and the magnet rotor is rotated by the current applied to the driving coil by configuring the exciting coil by a driving coil and a braking coil. A braking force is applied to the rotor by a counter electromotive force generated in the braking coil.
JP 2003-241311 A

  However, if a light amount adjusting device that moves blades by arranging blade members widely known in camera devices or the like in the optical path opening and supplying power to the excitation coil of the driving device, the following problems arise. Arise. For example, when the image changes every 1/60 seconds in the projector device, the luminance change of each image (frame) is adjusted to adjust the amount of light to soften the stimulus given to the viewer's eyes, or to adjust the contrast, the light amount adjustment blade Must continue to move at a high speed of, for example, 1/60 second or more. For this reason, a problem arises in the durability of the drive motor and movable members such as blade members connected thereto.

  When projecting on a screen with a projector device and viewing it, whether or not the change in brightness of the image stimulates the viewer's eyes and causes discomfort depends on the viewing position as well as individual differences, and is viewed from a relatively short distance. The case differs from the case of viewing from a relatively long distance. Similarly, the light amount adjustment device continues to operate even when there is no viewer in the viewing range. In this case, it is time-consuming and inconvenient to repeatedly turn off and start the projector each time.

  Therefore, in the present invention, when adjusting the light amount of the optical path from the light source to the projection lens, the light amount adjustment cycle is varied depending on whether or not there are viewers in the viewable range or whether or not there are viewers in the predetermined viewing range. Therefore, the problem is to supply a light amount adjusting device with high durability such as a stable light amount adjustment for a long period of time and a projector device using the same.

  The present invention adopts the following configuration in order to solve the above problems. A light amount adjusting device arranged in an optical path for irradiating light from a light source to a liquid crystal panel, a DLP (digital light processor) or other image forming means is configured as follows. A substrate having an optical path opening is disposed between the light source and the image forming means. On this substrate, one or a plurality of light quantity adjustment blades are attached to the optical path opening so as to be able to rotate or slide so that the opening and closing of the optical path can be adjusted to a large or small diameter. An electromagnetic driving means is connected to the light quantity adjusting blade, and a control means for supplying a control current to the electromagnetic driving means is provided.

  On the other hand, sensor means for identifying the presence of a person is provided in an area for viewing a projection image obtained by projecting light from the image forming means by the projection means. This sensor means, for example, arranges a pyroelectric sensor for detecting infrared rays from a person toward a preset area. The control means includes a first control mode in which the blades are opened and closed at a predetermined cycle according to a change in luminance of the image forming means, and the electromagnetic drive means is inactivated or not in response to a signal from the sensor means. A second control mode is provided in which the blades are opened and closed with a period different from the predetermined period.

  In the first control mode, for example, luminance is extracted from an image data portion that transfers image data to the image forming unit, a luminance change of a continuous image is calculated from the extracted luminance, and the image data is sent to the image forming unit. The light quantity adjustment blade is driven to open and close in synchronization with the timing. For example, the light quantity adjustment blade is opened and closed at a preset cycle with the reference clock of the control CPU. The opening / closing positions of the blades at this time are calculated based on the luminance data extracted from the image data in advance.

  For example, when the operation cycle of the first control mode is 1/60 seconds, the second control mode is set smaller than the first control mode, for example, the operation cycle for opening and closing the blades is 1/30 seconds. With this setting, the brightness change is adjusted every 1/60 seconds in the first control mode, and a flicker-free image is projected on the screen. In the second control mode, there is a slight flicker, but the light amount adjusting blade And durability of the electromagnetic drive device which drives this can be increased. In the second control mode, the electromagnetic drive device may be deactivated, and the light amount adjustment blade may be stopped at a predetermined position (maximum aperture position or minimum aperture position). Further, even if the sensor means detects whether or not a person exists in the entire area where the image projected on the screen is viewed, for example, it detects whether or not a person exists in a part of the area such as a short-distance viewing area. You may set as follows. The control means is configured to turn off or reduce the light quantity of the light source simultaneously with controlling the light quantity adjusting blade in the second control mode when a person is not present in a predetermined area by a signal from the infrared sensor. It is also possible to do.

  The present invention includes a first operation mode in which drive control of the light amount adjustment blade is controlled at a predetermined cycle according to a luminance difference between images projected continuously, and a second operation mode in which drive control is performed at a different cycle. Since the first and second operation modes are selected by a signal from the sensor means for detecting the presence of the viewer who views the projected image, the presence or absence of the viewer or the viewer is placed in a specific area. It is possible to provide a light quantity adjusting device with few failures and high durability as compared with the conventional apparatus in which the light quantity adjusting blade is driven and controlled at a constant cycle regardless of whether or not it is present.

  The present invention will be described in detail below based on the preferred embodiments shown in the drawings. First, according to the present invention, a light source unit in a casing, a spectroscopic unit that splits light from the light source into RGB three primary colors, an image forming unit that forms an image based on a signal from an image data unit, and image formation from the spectroscopic unit A projector unit comprising a light projecting unit for projecting light radiated on the unit, a light amount adjusting device built in the casing and disposed between the light source and the spectroscopic unit, and an integral part inside or outside the casing And a sensor unit including a human sensor that detects whether or not a person is present in an area in a predetermined direction.

  Each of the above configurations will be described. As an image input method to the projector, there are an RGB signal, a component signal, a high-definition signal, a video signal, and the like. The RGB signal is, for example, a case where a signal is sent to the projector from an image output terminal of a computer. The signal is connected to a tuner such as a high-definition television, and the video signal is connected to an output terminal such as a video deck and the projector device. Various projector devices are known. As an example, FIG. 2 shows a layout configuration in the case where a liquid crystal panel is used as an image forming unit (image forming means).

  In FIG. 2, H is a projector, and S is a screen for projecting an image. The projector H includes a light source 1 for projection, and 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 is applied. Then, the light emitted from the light source 1 is collected by the reflecting mirror 2 on the object surface, converted into almost parallel light by the integrator lenses 3 and 4 to be light with less spots, and then the light amount is adjusted to an optimum brightness by the light amount adjusting device E. Is done.

  This light passes through the integrator lens 4 that improves the light collection efficiency to the liquid crystal panel and the peripheral light amount ratio, 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 light beam is guided to the condensing lens 5a via the reflection mirror 12b, condensed into parallel light, transmitted through the liquid crystal panel 8, and reaches 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 the characteristic of transmitting R light and reflecting G light. The light is condensed into parallel light by the optical lens 5b, passes through the liquid crystal panel 8, 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 through the two reflecting mirrors 12c and 12d, is condensed into parallel light, and is transmitted through the liquid crystal panel 8, and is transmitted through the R light image. 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, and is appropriately enlarged by the projection lens 9 and projected onto the front screen S.

  Next, an arrangement relationship among the light source 1, the integrator lens 3, and the light amount adjusting device E will be described with reference to FIG. In FIG. 3, 1 is a light source, 2 is a parabolic reflector, 3 is an integrator lens, and E is a light amount adjusting device.

  Therefore, the light beam emitted from the light source 1 is applied to the integrator lens 3 as shown in the figure while being reflected and collected by the parabolic reflecting mirror 2. As described above, the integrator lens 3 has a rectangular region 3a that reduces light spots and transmits light at the center.

  Accordingly, the emitted light beam is irradiated to the light amount adjusting device E after the ambient light unnecessary for the screen projection is cut in the rectangular area 3a. The light path opening 510 of the light amount adjusting device E is set to be larger than the opening diameter when the light amount adjusting blade 200 is fully opened, and the maximum opening diameter of the light amount adjusting blade 200 is set to be smaller than the region transmitting the rectangular region 3a. .

  Therefore, the light quantity adjusting blade 200 is configured by arranging a plurality of blade members in the optical path opening 510 so as to be openable and closable as will be described later, and this blade member uses a metal material such as a stainless material, an SK material, etc. The surface is subjected to gloss plating such as chrome plating or nickel plating so as not to absorb light. The reason why the blade member is made of a thin metal plate is to prevent the light passing through the rectangular region 3a from being cut by infrared rays by the filter 3 but still having a considerably high temperature, thereby preventing deformation due to heat.

  Next, the light quantity adjusting device E will be described. As shown in an exploded perspective view in FIG. 4, 100 is a pressing plate, 200 is a light quantity adjusting blade, 300 is a protective cover, 400 is a transmission ring member that drives the light quantity adjusting blade, Reference numeral 500 denotes a substrate, 600 denotes an operation lever that operates the transmission ring member in a predetermined direction, and 700 denotes a drive motor (electromagnetic drive means) that drives the operation lever. These are sequentially stacked on the substrate 500 and assembled.

  That is, the light quantity adjusting blade 200 formed of a blade member on a substrate having an appropriate shape such as a disk shape, a transmission member (a transmission ring member shown in the figure) 400 that opens and closes the adjustment unit 200, and a drive that drives the transmission member 400 The motor 700 is attached, and the holding plate 100 is attached to the substrate 500. Accordingly, each of the above components is accommodated and held between the substrate 500 and the presser plate 100.

  The substrate 500 has an optical path opening 510 in the center, a concave groove 520 is formed on the outer concentric circle of the optical path opening 510, and a projection guide rail 525 is formed on the bottom of the groove, so that the transmission ring member (transmission member) 400 is rotatable. To support. Further, the shaft 530 serving as the center of rotation of the light quantity adjusting blades 200 respectively planted at equally divided positions on the outer concentric circles, and the operation of the light quantity adjusting blades (blade members) 200 in the vicinity of the respective support shafts 530. A stop hole 550 for screwing the presser plate to a position where it does not obstruct, a stop hole 542 for supporting the drive motor 700 protruding to the outside, an escape hole 544, and an operation pin 620 to be described later of the operation lever 600 pass therethrough. The support part 540 in which the fan-shaped slit 546 to be formed is provided. In addition, the spindle 530 shown with the same shape in the drawing has the same function, and the reference numerals are omitted.

  The transmission ring member 400 has an opening 410 in the center, and is rotatably fitted in the concave groove 520 of the substrate 500. Further, in order to swing the light quantity adjusting blade 200, an operating pin 420 planted at a position equally divided on the circumference on the ring plane, an arm 430 projecting toward the support portion 540 side of the substrate 500, and the arm 430 A slit hole 440 is formed at the tip, and an operation pin 620 of an operation lever 600 to be described later is fitted.

  The light quantity adjusting blade 200 is composed of a plurality of blade members (six illustrated members), and a fitting hole 210 that is fitted to the support shaft 530 of the substrate 500 at the end of each blade member and is rotatable. A slit hole 220 into which the operating pin 420 of the transmission ring member 400 is fitted, and protrusions 230 that support the blade members at predetermined intervals are provided at the tip portions of the blade members stacked as shown in the figure. In addition, the same shape shown in FIG. 4 has the same function, and the code | symbol is abbreviate | omitted.

  The holding plate 100 is formed in a ring shape having an optical path opening 110 having the same diameter as the optical path opening 510 of the substrate 500 in the center, and holds and protects the transmission ring member 400 and the light quantity adjustment blade 200 so as to be rotatable with respect to the substrate 500. In order to achieve this, the mounting portion 120 for fixing the substrate 500 to the substrate 500 at a constant interval, the relief slit hole 130 of the operating pin 420 of the transmission ring member 400, and the relief hole 140 of the support shaft 530 of the substrate 500. Is forming.

  The operating lever 600 has a fitting hole 610 that fits and fixes to the support shaft 710 of the drive motor 700 at one end, and an operating pin 620 formed at the tip of the other end. The operating pin 620 is a slit hole of the transmission ring member 400. The drive of the drive motor 700 is transmitted to the transmission ring member 400 by fitting to 440.

  When the drive motor 700 is described with reference to FIG. 5, the rotating shaft 710 fitted to the aforementioned operation lever 600 at the center of the outside, the magnet rotor 720 through which the rotating shaft 710 passes, and the rotating shaft direction for rotatably supporting the magnet rotor 720. A coil frame 730 that is divided into two parts, top and bottom or left and right; a conductive coil 740 wound around the outer periphery of the coil frame 730; a yoke 750 that cuts magnetic influences from the outside; covers 770 and 780; A fixing portion 760 that is integrally formed and fixedly supported on the substrate 500 is provided.

  In addition, various electromagnetic motors can be used as the drive motor 700. In the illustrated motor, an excitation coil is wound around the magnet rotor 720 in a direction perpendicular to the magnetic pole direction, and current is applied to the excitation coil. The magnet rotor 720 is rotated by a predetermined angle by the magnetic field generated in this manner.

  Then, it is rotated clockwise or counterclockwise in the direction of the applied current. It is also possible to stop the rotor rotated by the drive coil by the brake coil by winding the drive coil and the brake coil around the coil frame 730 and applying a current in the opposite direction. It is also possible to detect the rotor magnetic wave (magnetic field) by embedding a Hall element at a location or at several locations to detect the angular wave position of the rotor.

  Therefore, the blade member rotates in a predetermined direction by energizing the drive coil, the angular position is detected by the Hall element, and the blade member is accurately stopped at the predetermined position by energizing the braking coil, and the light quantity is applied to the aperture formed by the blade member. Will be adjusted.

  Next, the assembly process of the light quantity adjustment unit composed of six blade members as shown in FIG. 4 will be described. First, the transmission ring member 400 is fitted into the concave groove 520 of the substrate 500 at the position shown in FIG. From there, the fitting hole 210 is fitted into the support shaft 530 of the substrate 500 at the position where the first blade member of the light quantity adjusting blade 200 faces, and the slit hole 220 is fitted into the operating pin 420 of the transmission ring member 400. In the same manner, the second blade member, the third blade member, the fourth blade member, and the fifth blade member are overlapped with each other so that the sixth blade member is similarly overlapped with the fifth blade member. As shown in the figure, the tip of the blade is superposed so as to be positioned below the first blade member. Next, the presser plate 100 is screwed from the top at six locations with a set screw 160 in the state shown in the drawing to complete the light quantity adjustment unit. That is, each blade member is supported between the substrate 500 and the presser plate 100 so as to be openable and closable (turnable), and the substrate is composed of the flat member 500 and the presser plate 100, respectively.

  The assembly process of the drive motor 700 will be described with reference to FIG. 5. First, a rotor in which a support shaft 710 and a sintered magnet rotor 720 are integrated in advance by insert molding is a top and bottom where a conductive coil 740 is wound around an outer circumferential groove. Alternatively, after the yoke 750 is fitted in a state where the coil 730 is pivotably wrapped by the left and right divided coil frame 730 and sandwiched between the cover 770 and the cover 780, the operating lever 600 is fitted and fixed at an appropriate position of the support shaft 710. The drive motor 700 is completed.

  Then, as shown in FIG. 4, the operation pin 620 of the operation lever 600 attached to the drive motor 700 is fitted into the slit hole 440 of the transmission ring member 400 positioned at the support portion 540 of the drive motor 700 of the substrate 500 and protected. 5 is completed by attaching and fixing the cover 300 to the substrate 500 together with the fixing portion 760 of the drive motor 700 from the opposite surface facing the transmission ring member 400 with respect to the support portion 540.

  Therefore, the following consideration is given to the illustrated blade member in order to reduce friction between the overlapping blades. In other words, at least one of the substrate 500 and the holding plate 100 constituting the above-described substrate is provided with a guide surface that restricts (guides) the movement of the blade, and the blade is configured to open and close along this surface. And this guide surface is provided with the 1st guide surface formed in the peripheral part (near) of the said spindle, and the 2nd guide surface formed in the peripheral part of the said optical path opening, This 1st guide surface and 2nd guide surface A height difference is formed such that one is high and the other is low in the direction perpendicular to the direction of the optical path. This height difference is configured by forming the substrate surface on an inclined plane or a stepped surface. As a result, each blade member opens and closes at a predetermined angle in the direction of the optical path.

  Accordingly, when one of the first guide surface and the second guide surface is formed high, the substrate 500 and the holding plate 100 are formed low. The built-in state of the light quantity adjusting blade 200 will be described with reference to FIG. 6. First, the tip portion that contacts the light quantity adjusting blade 200 at the circumferential edge of the concave groove 520 forming the optical path opening 510 with respect to the plane reference XX of the substrate 500. A step that protrudes by a height h1 and that contacts the light amount adjusting blade 200 at a portion where the support shaft 530 is implanted protrudes by a height h2 (h2> h1) with respect to the plane reference XX.

  On the other hand, the front end portion of the press plate 100 parallel to the plane reference XX is a front end portion that contacts the light amount adjusting blade 200 by the restriction protrusion 150 formed by drawing processing facing the protruding front end portion of the circumferential edge portion of the substrate 500. The tip portion that protrudes by a height h3 from the reference YY and contacts the light quantity adjusting blade 200 through the escape hole 140 formed by drawing to which the support shaft 530 is fitted is higher than the plane reference YY. It protrudes by h4 (h4> h3).

  Accordingly, each blade member of the light quantity adjusting blade 200 is set on the substrate 500 in a posture in which the inclination direction is different from the plane reference XX of the substrate 500, but the absolute value is inclined by the same inclination α, and on each different plane. It rotates. As a result, the six blade members of the light quantity adjusting blade 200 are not closely contacted as shown in FIG. 6A, and the intervals are not uniform, but are held and rotated at a certain interval. The contact portion between the blade members is drastically reduced, and the noise generated by the mutual contact and rubbing of the surfaces during operation can be suppressed.

  Next, referring to FIG. 7, the light quantity adjusting blade 200 will be described. The blade member is formed by stamping a thin metal sheet plate made of stainless steel, SK material or the like by press working. At this time, since the support shaft 530 and the fitting hole 210 of the substrate 500 and the operation pin 420 and the slit hole 220 of the transmission ring member 400 are fitted and slid, respectively, the operation pin 420 of the support shaft 530 or the transmission ring member 400 is inserted. However, it is scraped against the press fracture surface of the blade member and adversely affects the durability.

  For this reason, as shown in the figure, the hole side is subjected to bar link processing so that the end portion of the press fracture surface does not directly contact the support shaft 530 of the substrate 500 and the operation pin 420 of the transmission ring member 400, and By enlarging the contact area, the contact portion is less likely to be worn and durability can be increased.

  Similarly, the shape of the slit hole 440 of the transmission ring member 400 shown in FIG. 8 will be described. The transmission ring member 400 is formed by press forming an aluminum plate. At that time, the slit side portion of the slit hole 440 is processed by burring to make the plate thickness t1 equivalent to the plate thickness t2 (t1 <t2), and this processing increases the contact area of the operating lever 600 with the operating pin 620. The operating pin 620 is less likely to be worn on the side end surface of the slit hole 440 against friction during operation, and durability can be increased.

  Next, a control circuit for opening and closing the blade member 200 will be described. Each blade member described above is connected to a ring-shaped transmission member 400 that is rotatably disposed around the optical path opening 510, and the transmission motor 400 is connected to the transmission member 400. Therefore, when power is supplied to the exciting coil 740 constituting the drive motor 700, the magnet rotor 720 rotates in a predetermined direction, and the operating lever 600 attached to the rotating shaft 710 of the rotor rotates the transmission member 400. .

  Then, as shown in FIG. 9, the power supply control circuit for the exciting coil 740 compares the detected value obtained by detecting the angular position of the magnet rotor with the appropriate light amount adjustment level value of the projector device described later, and compares the both. A light amount adjustment signal for moving the position, a differential amplifier for comparing the light amount adjustment signal and the detected position value of the rotor, and a power supply circuit for supplying a drive current to the exciting coil by the differential amplifier.

  In FIG. 9, IN represents an input terminal for a light amount adjustment signal transmitted from the control circuit of the projector apparatus, and OUT represents the detection value of the Hall element HS for detecting the angular position of the rotor by an amplifier Q3, and the control circuit This is an output terminal for transmission. + V is a voltage applied to the power supply control circuit D, and G is a ground terminal that applies a predetermined voltage to the ground grounded by the exciting coil. In the figure, Q1 to Q3 constitute operational amplifiers with operational amplifiers, L1 denotes a driving coil constituting an exciting coil, and L2 denotes a braking coil.

  On the other hand, the above-mentioned projector device has a built-in or externally mounted human detection sensor having the following structure in its casing. As the person detection sensor S0, various sensors are known for detecting whether or not a person (viewer, the same applies hereinafter) exists within a predetermined range (area). For example, infrared rays emitted from a person are detected to detect the energy distribution. A pyroelectric sensor that detects and identifies the movement of a person from a change, or an ultrasonic sensor that transmits an ultrasonic wave toward the person and captures and determines the Doppler effect of the reflected wave is used.

  FIG. 10 is an explanatory diagram showing a detection region of the person detection sensor S0, and FIG. 11 is an explanatory diagram showing a control circuit for processing an output signal from the person detection sensor S0. The illustrated example is an example using a pyroelectric sensor as a person detection sensor. In FIG. 10, the pyroelectric sensor S0 is detachably attached as an attachment to the exterior casing 13 of the projector device, and the areas AR1, AR2, AR3 are detected by the three pyroelectric sensors S01, S02, S03.

  Each pyroelectric sensor S01, S02, S03 is provided with a condensing lens (not shown), and detects the presence of a person within 360 degrees around the outer casing 13. The detection value of each pyroelectric sensor S0 is amplified by the amplifier circuit S1 and A / D converted. The A / D conversion value from each pyroelectric sensor SO is compared with the reference value in the comparison circuit S3 and sent to the control CPU (S2). The control CPU (S2) receives the comparison data from the comparison circuit S3 and determines whether or not a person exists in at least one of the sensors. The control CPU (S2) executes a first control mode, which will be described later, when it is determined that a person exists, and a second control mode when it does not exist. The control CPU (S2) extracts the luminance from the image data simultaneously with sequentially transferring the image signals from the image data storage unit to the image forming unit of the projector apparatus at a predetermined cycle. A light amount control value is set according to the luminance information extracted from the image data.

At this time, the control CPU (S2) executes the setting of the light quantity control value in a preset first cycle (first control mode) or in a second cycle (second control mode). This light quantity control value setting cycle is set in advance according to the apparatus specification, the first control mode cycle is 1/60 seconds, for example, and the second control mode cycle is a different value, for example 1/30 seconds. Set. The second period is set by selecting one of the following.
(1) The unit time of the second cycle is set to infinite time, and the control cuts off the supply current of the light quantity control circuit.
(2) The unit time of the second period is set to a long value of the unit time of the first period, for example, the first unit time is set to 1/60 seconds, and the second unit time is set to 1/30 seconds.
(3) The second unit time is selected and set from a plurality of unit times. That is, when the pyroelectric sensors S01 and S03 do not detect a person, that is, when there is no viewer at a short distance from the screen and when the pyroelectric sensor S02 detects a person, that is, when there is a viewer at a long distance. For example, when 1/30 second is set and none of the sensors S01, S02, and S03 detects a person, that is, when there is no viewer, the unit time is set to infinite time and the light amount adjustment is not performed. In this case, the control cuts off the supply current to the electromagnetic drive means.

  The configuration of each circuit will be described. A light amount adjustment signal for adjusting the light amount of an image to be projected is input from the control circuit of the projector H to the input terminal IN. On the other hand, the light quantity adjustment level signal of the light quantity adjustment device E at that time is detected by the Hall element HS, amplified by the operational amplifier Q3, and output. As a result, the two light quantity adjustment signals are compared at the circuit point E1, and either the positive or negative drive current corresponding to the potential difference between the operational amplifier Q1 and the operational amplifier Q2 flows to the drive coil L1 due to the potential difference, and the drive motor 700 in FIG. Is rotated.

  At this time, due to the magnetic characteristics that change in accordance with the rotation of the magnet rotor 720 in the braking coil L2, a braking current corresponding to the change amount flows into the braking coil L2 to simultaneously apply braking to the rotation of the magnet rotor 720, and at the same time, the Hall element The detection output of HS changes with the rotation of the rotor, and when the potential difference at the previous circuit point E1 disappears, the rotation of the drive motor 700 is stopped and appropriate light quantity adjustment is performed.

  In this driving, the capacitor C0 <bypass filter> connected between both ends of the driving coil L1 suppresses the change immediately after the driving current supply to the driving coil L1 is started, so that the rotation of the driving motor 700 is suppressed only immediately after the driving is started. Since the light amount adjustment speed of the light amount adjusting device E is decelerated, the connection between the substrate 500, the light amount adjusting blade 200, the transmission ring member 400, and the drive arm 600 starting to move is rattled, the impact when contacting each other, etc. The noise generated by is reduced.

  In the light amount adjusting device, as described above, a current is applied to the excitation coil (drive coil and braking coil), and the blade member moves to a predetermined position. In this process, according to the present invention, power is supplied as follows to a drive device (drive motor) that controls opening and closing of the blade member facing the opening of the optical path to adjust the opening diameter.

  First, a power supply voltage is applied to the drive coil L1 configured as described above. This power supply voltage is different when the detected value of the angular position of the rotor (opening / closing position of the blade member) detected by a position detection sensor such as a hall element is compared with the detected light amount adjustment value by the projector device. In this case, a light quantity adjustment signal is generated and a drive current is supplied to the drive coil L1 via the operational amplifiers Q1 and Q2.

  Therefore, the operation of the projector apparatus will be described with reference to FIGS. 9 and 11. The apparatus power is turned on and the light source lamp is turned on. Next, after adjusting the image, the image data is transferred and projected onto the screen. The transfer of the image data sends each image data to the image forming unit at a cycle set based on the reference clock of the control CPU (S2). Simultaneously with this data transfer, the control CPU obtains luminance data, compares it with the luminance of the previous image, and sets a light amount adjustment value. This light quantity adjustment value calculates a luminance change between successive images, and if there is a difference between them, a light quantity adjustment signal is sent to the control circuit of the electromagnetic drive means. In parallel with this operation, the control CPU (S2) monitors the status signals of the pyroelectric sensors S01, S02, and S03, and compares each output value with a reference value to determine whether each sensor has a person in the detection area. to decide.

  When determining that there is no person in each detection area AR1, AR2, AR3, the control CPU selects the second operation mode. The second operation mode is executed in any of the following. First, when it is determined that no person exists in any of the detection areas, that is, when the image is projected on the screen but there is no viewer, the operation is stopped. As a result, the light quantity adjusting blade is maintained in a state before being blocked. It is also possible to delay the light amount adjustment cycle instead of this stop, and set the unit time of the first operation mode to a longer unit time. Second, when the detection values of the pyroelectric sensors AR1 and AR3 whose detection areas are relatively close do not detect a person and the pyroelectric sensor AR2 whose detection areas are relatively far away detect a person The supply current of the electromagnetic drive means is cut off, or the light quantity adjustment cycle is delayed.

  By controlling in this way, it is possible to improve the durability of the electromagnetic driving means and the light quantity adjusting blades under the usage environment of the projector device that continues the photographing state for a long time, and to prevent problems such as failure. In addition, it is possible to prevent noise due to the operation sound of the light quantity adjusting blade.

  The illustrated light amount adjusting device has been described as being disposed between the light source of the projector device and the image forming means, but this light amount adjusting device may be disposed in the optical path from the light source to the light projecting means. You may incorporate in the lens part of a light projector.

  The control means is configured to turn off or reduce the light quantity of the light source simultaneously with controlling the light quantity adjusting blade in the second control mode when a person is not present in a predetermined area by a signal from the infrared sensor. It is also possible to do. In this case, a switch means for turning off the power supplied to the light source lamp may be provided, or a configuration for reducing the voltage of the power supplied to the light source lamp may be employed. In the illustrated embodiment, the present invention has been described with respect to the front projector that projects from the light projecting means onto the reflective screen. However, the present invention is a rear projection TV projector that projects from the light projecting means onto the transmissive screen and is viewed from the back side. But the same is true. In this case, the infrared sensor is arranged so as to detect whether a person is present in the viewing area on the back side of the screen.

Explanatory drawing which shows the system configuration | structure of the projector apparatus concerning this invention. The schematic block diagram of the projector apparatus concerning this invention. The layout explanatory drawing of the light quantity adjustment apparatus concerning this invention. The assembly exploded perspective view of a light quantity adjustment device. FIG. 5 is a side sectional view of the apparatus of FIG. 4. Explanatory drawing which expanded and showed a part of apparatus of FIG. FIG. 6 is an explanatory view showing the overlapping state of the blade members of the apparatus of FIG. 5 and an explanatory view showing a partial cross section thereof. It is a perspective view which shows the transmission member of the apparatus of FIG. 4, (a) shows the cross-sectional shape of a slit hole, (b) is sectional drawing which shows the shape of a slit hole different from (a). The light quantity adjustment circuit diagram which drives the light quantity adjustment apparatus which concerns on this invention. Explanatory drawing which shows the detection area | region of a person detection sensor. Explanatory drawing which shows the control circuit which processes the output signal from a person detection sensor

Explanation of symbols

H Projector 1 Light source 2 Reflector 3, 4 Integrator lens 5 a, 5 b Condenser lens 8 Liquid crystal panel 9 Projection lens 10 a, 10 b Dichroic mirror 11 Composite prism 12 a, 12 b, 12 c, 12 d Reflective mirror 13 Exterior casing S Screen E Light quantity adjustment device 100 Holding plate (presser plate)
200 Light intensity adjustment blade (blade member)
300 Protective cover 400 Transmission ring member (transmission means)
500 Substrate 510 Optical path opening 600 Actuating arm 700 Driving source (driving motor)
D Light intensity adjustment circuit

Claims (7)

  1. A liquid crystal panel and other image forming means;
    A light source for irradiating the image forming means with light;
    A light amount adjusting device that is mounted on a projector device including a projecting unit that projects light from the image forming unit and adjusts the light amount of the light from the light source according to a change in luminance of the image forming unit;
    A substrate disposed in the optical path from the light source to the projection means and having an optical path opening;
    A light amount adjusting blade which is movably attached to the substrate and adjusts the opening of the optical path to be large or small;
    Electromagnetic driving means for opening and closing the light quantity adjusting blade;
    A control means for supplying a control current to the electromagnetic drive means,
    The control means includes a first control mode for opening and closing the light amount adjusting blade at a predetermined cycle in accordance with a change in luminance of the image forming means;
    A second control unit that controls driving of the light amount adjusting blade in a non-operating state or a period different from the predetermined period by a signal from a sensor unit that identifies the presence of a person who appreciates a projected image from the projection unit; Control mode,
    A projector light amount adjusting device characterized by comprising:
  2.   2. The light quantity for a projector according to claim 1, wherein the light quantity for a projector according to claim 1 is set such that the unit time of the operation cycle in the second control mode is longer than the unit time of the operation cycle in the first control mode. Adjustment device.
  3.   2. The projector light amount adjusting device according to claim 1, wherein the sensor means is an infrared sensor that detects whether or not a person is present in a predetermined area where an image from the projection means can be viewed.
  4.   The light quantity adjusting blade for a projector according to claim 1, wherein the light quantity adjusting blade is composed of a plurality of blade members, and the blade member adjusts an opening diameter of an optical path opening formed in the substrate. .
  5.   4. The projector light amount adjusting device according to claim 3, wherein the infrared sensor is composed of a pyroelectric sensor capable of detecting the presence of a human body by a change in distribution of infrared energy.
  6. A liquid crystal panel and other image forming means;
    A light source for irradiating the image forming means with light;
    Projection means for projecting light from the image forming means;
    A substrate having an optical path opening disposed in an optical path from the light source to the projection means;
    A light amount adjusting blade which is movably attached to the substrate and adjusts the opening of the optical path to be large or small;
    Electromagnetic driving means for opening and closing the light quantity adjusting blade;
    Control means for supplying a control current to the electromagnetic drive means;
    An infrared sensor for detecting whether or not a person is present in a predetermined area where the image from the projection means can be viewed,
    The control means includes a first control mode for opening and closing the light amount adjusting blade at a predetermined cycle in accordance with a change in luminance of the image forming means;
    A projector apparatus, comprising: a second control mode for driving and controlling the light amount adjusting blade in a non-operating state or a period different from the predetermined period by a signal from the infrared sensor.
  7.   The projector device according to claim 6, wherein the control unit turns off the light source or reduces the light emission amount by a signal from the infrared sensor.
JP2004381490A 2004-12-28 2004-12-28 Light quantity control device and projector apparatus using the same Pending JP2006189467A (en)

Priority Applications (1)

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