JP4988948B2 - Projection display - Google Patents

Description

  The present invention relates to a projection display apparatus that enlarges and projects an image on a display element onto a projection surface, and in particular, forms an image on the display element as an intermediate image between a projection lens unit and a reflection mirror. It is suitable for use in a projection display device that magnifies and projects an image on a reflecting surface.

  Projection display devices (hereinafter referred to as “projectors”) that enlarge and project an image on a display element (liquid crystal panel or the like) onto a projection surface (screen or the like) have been commercialized and widely spread. In order to shorten the distance between the screen and the projector body, this type of projector adopts an oblique projection configuration in which the projection optical system is widened and the traveling direction of the projection light is inclined with respect to the optical axis of the projection optical system. Projectors have been proposed.

  For example, in the invention described in Patent Document 1 below, a wide-angle lens having a large field angle is used as the projection optical system, and the display element and the screen are shifted in directions opposite to each other with respect to the optical axis of the projection optical system. In addition, the projection distance is shortened and oblique projection without distortion is realized. However, since this prior invention requires a wide-angle lens with a large angle of view, the increase in cost associated with the increase in the size of the lens and the increase in the size of the projector body are problematic.

  On the other hand, in the invention described in Patent Document 2 below, a projection lens unit and a mirror are used as a projection optical system, and an image on the display element is formed as an intermediate image between the projection lens unit and the mirror. The projection distance is reduced by enlarging and projecting the intermediate image with a mirror. According to this prior invention, widening of the angle is realized by a relatively small curved mirror, so that an increase in cost and an increase in size of the projector main body can be suppressed.

In this type of projector, generally, focus adjustment and zoom adjustment are performed in a projection lens unit. For example, as shown in Patent Document 3 and Patent Document 4, an operation unit operated by the user is provided, and by operating this operation unit, the position of the lens in the projection lens unit is displaced in the optical axis direction, thereby The focus and zoom are adjusted.
Japanese Patent Laid-Open No. 05-10032 JP 2004-258620 A JP 2002-228910 A JP 2003-215702 A

  However, as in the invention described in Patent Document 2, in the case of a projector that reflects light from the projection lens unit by a reflection mirror, the light that is folded back to the projection lens unit by the reflection mirror is near the projector body. Will pass. For this reason, depending on the arrangement of the operation unit for adjusting the focus and zoom, the operation unit itself may be in the optical path, or the user's finger may be in the optical path when operating the operation unit. There is a risk of shadowing the image.

  The present invention has been made to solve such a problem, and it is an object of the present invention to provide a projection display device that prevents a shadow from being generated in a projected image when adjusting focus or zoom. To do.

  In view of the above problems, the present invention has the following features.

  According to the first aspect of the present invention, the projection lens unit into which the light modulated by the light modulation element is incident, and the light emitted from the projection lens unit is reflected and folded back toward the projection lens unit toward the projection surface. A projection display device including a mirror unit to be displaced, and an operation unit for displacing a lens in the projection lens unit, wherein the operation unit is folded by the mirror unit, and a projection port disposed in a main body cabinet is provided. It is arranged in a region that does not go along the optical path of the light after passing through.

  Note that the operation unit optically adjusts the state of the projected image on the projection surface, for example, for performing focus adjustment and zoom adjustment.

  According to a second aspect of the present invention, in the projection display device according to the first aspect, the operation unit projects the projection when the main body cabinet is viewed from the projection port side in a side region on the main body cabinet. It is arranged in a side region other than the side region on the projection port side occupied by the optical path of the light after passing through the mouth.

  According to a third aspect of the present invention, in the projection display device according to the second aspect, the operation unit is exposed to the outside from a side surface of the main body cabinet on the left side or the right side as viewed from the projection port side. It is characterized by.

  According to a fourth aspect of the present invention, in the projection display device according to the third aspect, the operation portion includes a knob portion that is touched when operated by a user, and a side surface of the main body cabinet on the left side or the right side is An accommodation portion that is recessed from the side surface is provided, and the knob portion is accommodated in the accommodation portion so as not to protrude from the side surface of the cabinet.

  According to the configuration of the present invention, it is possible to prevent the operation unit for performing focus adjustment, zoom adjustment, and the like, and the user's finger when operating the operation unit from blocking the projection light directed to the projection screen. As a result, it is possible to prevent the projected image from being shaded.

  In particular, if the operation unit is exposed to the outside from the left or right side of the main body cabinet as viewed from the projection port side, the rear side is installed on a desk or the like for projection. Even when the mold display device is used, the operation unit can be operated smoothly.

  In addition, according to the fourth aspect of the present invention, since the knob portion does not protrude from the main body cabinet, it is difficult for the knob portion to be caught by something and damaged when the projector is moved.

  The effects and significance of the present invention will become more apparent from the following description of embodiments. However, the following embodiment is merely an example when the present invention is implemented, and the present invention is not limited to what is described in the following embodiment.

The figure (perspective view) which shows the structure of the projector which concerns on embodiment The figure (top view) which shows the structure of the projector which concerns on embodiment The figure which shows the structure of the projector which concerns on embodiment (bottom view) The figure which shows the structure of the projector which concerns on embodiment (right view) The figure which shows the structure of the projector which concerns on embodiment (left side view) The figure which shows the structure of the projector which concerns on embodiment (front view) The figure which shows the structure of the projector which concerns on embodiment (rear view) The figure which shows the structure of the projection optical system which concerns on embodiment (perspective view) The figure (sectional drawing) which shows the structure of the projection optical system which concerns on embodiment The figure which shows the structure of the optical engine which concerns on embodiment The figure (perspective view) which shows the external appearance structure of the projector which concerns on embodiment The figure which shows the external appearance structure of the projector which concerns on embodiment (right side view) The figure which shows the structure of the lever which concerns on embodiment The figure which shows the knob housing part and lever arrangement | positioning relationship of the side panel which concern on embodiment

  The configuration of the projector according to the embodiment will be described below with reference to the drawings.

  1 to 7 are diagrams showing the projector in a state where the external cabinet is omitted. 1 is an external perspective view of the projector, and FIGS. 2, 3, 4, 5, 6, and 7 are a top view, a bottom view, a right side view, a left side view, a front view, and a front view of the projector, respectively. It is a rear view. 2 to 7 show the projector with the main board 40 removed. 8 and 9 show an overview perspective view and a sectional view (schematic diagram) of the projection optical system, respectively.

  1 to 7, the projector includes an optical engine 10, a projection optical system 20, a power supply unit 30, a main board 40, an AV terminal unit 50, an intake fan 60, an exhaust fan 70, An AC inlet 90 is provided. In addition, 80a is a boss from the upper surface side cabinet, 80b is a boss from the lower surface side cabinet, and 80c is a bush for absorbing vibration.

  The projection optical system 20 has a plate-like portion 202a, 205a shown in FIG. 8 that is sandwiched between bosses 80a, 80b via a bush 80c as shown in FIGS. Installed. Since the projection optical system 20 is sandwiched via the vibration absorbing bush 80c, it is difficult for an impact to be transmitted to the projection optical system 20. Further, since the projection optical system 20 is supported by the boss 80a from the upper surface side cabinet and the boss 80b from the bottom surface side cabinet via the vibration absorbing bush 80c, the support strength is improved.

  The optical engine 10 separates white light from the light source 101 into light in the blue wavelength band, green wavelength band, and red wavelength band and modulates light in each wavelength band with a display element (liquid crystal panel). The light of each wavelength band is color-synthesized by a dichroic prism, and the synthesized light is emitted to the projection optical system 20. As shown in FIG. 2, the light source 101 is arranged so as to irradiate light in the X-axis direction, and the projection optical system 20 is arranged so that the optical axis is in the Y-axis direction. The configuration of the optical engine 10 and the positional relationship between the optical engine 10 and the projection optical system 20 will be described later with reference to FIG.

  The power supply unit 30 supplies power to the light source 101 and the main circuit 40. An AC voltage is input to the power supply unit 30 via the AC inlet 90. The main circuit 40 is a circuit for driving and controlling the projector. As shown in FIG. 1, the circuit board that holds the main circuit 40 is disposed on the upper surface of the optical engine 10 so as to cover a part of the optical engine 10. Further, an AV (Audio Visual) signal is input to the main circuit 40 via the AV terminal unit 50.

  As shown in FIGS. 1 and 3, three intake fans 60 are arranged on the bottom surface side of the optical engine 10. The air sucked by these intake fans 60 is exhausted by an exhaust fan 70 (see FIG. 5) disposed on the left side of the optical engine 10 and an exhaust fan 70 (see FIG. 7) disposed on the back side. By arranging the intake fan 60 and the exhaust fan 70 in this way, the air sucked by the intake fan 60 flows through the optical system of the optical engine 10, the light source 101 and the power supply unit 30. Further, as shown in FIGS. 2, 3, and 6, the sucked air is guided to the side surface of the light source 101 through the duct 61 and flows from the side surface of the light source 101 toward the exhaust fan 70. The heat generated in these members is removed by the air flow.

  FIG. 8 and FIG. 9 show an overview perspective view and a sectional view of the projection optical system. FIG. 9 is a diagram schematically showing the A-A ′ cross section of FIG. 8.

  In the figure, 201 is a projection lens unit, 202 is a housing, 203 is a dust prevention cover, 204 is a reflection mirror, 205 is a mirror cover, and 206 is a light passage window (corresponding to the projection port of the present invention).

  The projection lens unit 201 includes a lens group for forming the projection light on the intermediate image plane, and an actuator for adjusting a focus state of the projection image by displacing a part of the lens group in the optical axis direction. I have. Here, the focus adjustment of the projection lens unit 201 is performed by rotating the lever 201a around the optical axis of the projection lens unit 201. The lever 201a is arranged so as to protrude from the side of the projection lens unit 201 as shown in FIG. 8 so as not to block the projection light projected from the light passage window 206.

  The reflection mirror 204 has an aspherical reflection surface, widens the projection light incident from the projection lens unit 201, and projects it from the light beam passage window 206 onto the projection surface (screen surface).

  The projection lens unit 201 is accommodated in the housing 202 and further covered with a dust prevention cover 203. The reflection mirror 204 is accommodated in the mirror cover 205 and attached to the housing 202 by attaching the mirror cover 205 to the housing 202.

  As shown in FIG. 9, the combined light generated by the optical engine 10 enters the projection lens unit 201 at a position away from the optical axis of the projection lens unit 201 in the Z-axis direction. The combined light incident in this way is subjected to a lens action by the projection lens unit 201 and is incident on the mirror 204. Thereafter, the combined light is widened by the reflection mirror 204 and projected onto the projection surface (screen surface) via the light beam passing window 206.

  As described above, the combined light from the optical engine 10 is incident on the projection lens unit 201 at a position shifted in the Z-axis direction from the optical axis of the projection lens unit 201. As shown in FIG. 4, the projection lens unit 201 is arranged so as to shift from the optical axis to the side opposite to the shift direction of the combined light. Here, since the reflection mirror 204 has a reflection surface larger than the lens surface of each lens constituting the projection lens unit 201, the shift amount of the reflection mirror 204 with respect to the optical axis of the projection lens unit 201 is relatively large. . For this reason, a relatively large space G is generated on the bottom side of the projector as shown in FIGS.

  Next, the main configuration of the optical engine 10 will be described with reference to FIG.

  The light source 101 includes a burner and a reflector, and emits substantially parallel light to the illumination optical system 102. The light source 101 is composed of, for example, an ultra high pressure mercury lamp. The illumination optical system 102 includes a fly-eye integrator, a PBS (polarization beam splitter) array, and a condenser lens, and uniformizes the light quantity distribution of each color light when entering the display elements (liquid crystal panels) 106, 109, and 115. The polarization direction of the light traveling toward the dichroic mirror 103 is aligned in one direction.

  The dichroic mirror 103 reflects only the light in the blue wavelength band (hereinafter referred to as “B light”) out of the light incident from the illumination optical system 102, and the red wavelength band (hereinafter referred to as “R light”) and green. Transmits through a wavelength band (hereinafter referred to as “G light”). The mirror 104 reflects the B light reflected by the dichroic mirror 103 in a direction toward the condenser lens 105.

  The condenser lens 105 imparts a lens action to the B light so that the B light enters the display element 106 as parallel light. The display element 106 is driven according to the blue video signal, and modulates the B light according to the driving state. A polarizing plate (not shown) is disposed on the incident side and the emission side of the display element 106.

  The dichroic mirror 107 reflects only the G light out of the R light and the G light transmitted through the dichroic mirror 103. The condenser lens 108 imparts a lens action to the G light so that the G light is incident on the display element 109 as parallel light. The display element 109 is driven according to the green video signal and modulates the G light according to the driving state. A polarizing plate (not shown) is disposed on the incident side and the emission side of the display element 109.

  The relay lenses 110 and 112 give a lens action to the R light so that the incident state of the R light with respect to the display element 115 becomes equal to the incident state of the B light and the G light with respect to the display elements 106 and 109. The mirrors 111 and 113 change the optical path of the R light so that the R light transmitted through the dichroic mirror 107 is guided to the display element 115.

  The condenser lens 114 imparts a lens action to the R light so that the R light enters the display element 115 in a parallel light state. The display element 115 is driven according to the video signal for red, and modulates the R light according to the driving state. Note that polarizing plates (not shown) are arranged on the incident side and the emission side of the display element 115.

  The dichroic prism 116 reflects B light and R light among the B light, G light, and R light modulated by the display elements 106, 109, and 115 and transmits the G light. And R color light is synthesized. The color-synthesized light (synthesized light) is incident on the projection lens unit 201 in the projection optical system 20 as described above. Then, the angle is widened by the reflection mirror 204 and projected onto the projection surface (screen surface) via the light beam passing window 206.

  As shown in the figure, the light source 101 is arranged so that the light irradiation direction is in the X-axis direction. By arranging the light source 101 in this way, the light source 101 is always positioned to irradiate light in the horizontal direction regardless of whether the projector is used in a ceiling-mounted installation, a stationary installation, or a desktop installation. Become. For this reason, the lifetime reduction of the light source 101 by arrange | positioning the light source 101 to a perpendicular direction can be suppressed.

  Further, as shown in FIGS. 2 and 10, since the light source 101 is arranged so that the optical axis of the light source 101 is orthogonal to the optical axis of the projection lens unit 201, the dimensions of the optical engine 10 in the optical axis direction of the projection lens unit 201. Can be suppressed. Therefore, the projection distance can be reduced, and as a result, the possibility that the light emitted from the light passage window 206 is blocked by an obstacle before reaching the screen can be reduced.

  FIG. 11 is a diagram (perspective view) showing an overview of the projector in a state where the internal structure of the projector shown in FIG. 1 is housed in a cabinet. FIG. 12 is also a right side view of the projector. In FIG. 12, the terminals of the AV terminal unit 50 are not shown.

  As shown in the figure, an arm member 400 is mounted on the bottom surface of the main body cabinet 300 in the main body cabinet 300 in order to correct a step generated corresponding to the space G (see FIGS. 4 and 5). In addition, two adjustment screws 500 are attached to the arm member 400 so that the tip portion penetrates the arm member 400.

  An operation button unit 301 is disposed on the upper surface of the main body cabinet 300. Further, an arc-shaped protrusion 302 is disposed on the bottom surface of the main body cabinet 300 at a position where the reflection mirror 204 is disposed.

  On the upper surface of the main body cabinet 300, a downwardly inclined surface 300a descending forward and an upwardly inclined surface 300b rising forward are formed following the downwardly inclined surface. The upward inclined surface 300b faces obliquely upward and rearward, and the light beam passing window 206 is disposed on this surface.

  The main body cabinet 300 is configured such that a part of the right side surface is opened and a side panel 303 is fitted into the opening portion. Each terminal of the AV terminal section 50 is arranged on the side panel 303. A knob housing portion 304 is formed at the front end of the side panel 303. The knob housing part 304 is provided with the knob part 201b of the focus adjusting lever 201a described above.

  As shown in FIG. 13, the lever 201a has a mounting portion 201c formed at the base end thereof fixed to the operation tube 201e of the projection lens unit 201 by a screw 201d. The operation cylinder 201e is one component constituting an actuator that displaces the lens in the projection lens unit 201. The lever 201a extends laterally from the operation cylinder 201e, and a knob portion 201b is provided at the tip thereof. The lever 201a is configured to rotate by a predetermined range (for example, 20 degrees each) in a clockwise direction and a counterclockwise direction in FIG.

  FIG. 14 is a diagram showing an arrangement relationship between the knob housing portion 304 of the side panel 303 and the lever 201a. In the figure, the components other than the lever 201a and the side panel 303 are not shown.

  The knob housing part 304 is a part to be an operation area of the knob part 201 b and has a vertically long groove shape that is recessed from the side surface of the main body cabinet 300. The bottom surface 304a of the knob housing part 304 has a curved shape that bulges outward. The center of curvature of the bottom surface 304a is the rotation center of the lever 201a, that is, the optical axis of the projection lens unit 201. On the bottom surface of the knob housing 304, a slit 304b is formed over the range in which the lever 201a rotates. The lever 201a is exposed in the knob housing 304 through the slit 304b.

  The knob portion 201b protrudes most laterally when the lever 201a is in a horizontal state. Even in this state, the knob portion 201b does not protrude from the recess of the knob housing portion 304 (the side line of the main body cabinet 300). As such, the length of the lever 201a is determined.

  Thus, when the user moves the knob portion 201b in the vertical direction from the horizontal state shown in FIG. 14A, the operation cylinder 201e rotates with the lever 201a accordingly. When the operation cylinder 201e rotates, the position of the lens in the projection lens unit 201 is displaced in the optical axis direction by a known interlocking mechanism such as a cam mechanism. Thereby, the focus state of the projected image is adjusted.

  In addition, the same figure (b) shows the state which moved the knob part 201b upwards. Since the bottom surface 304a of the knob housing portion 304 is curved as described above, the knob portion 201b moves along the bottom surface 304a and does not contact the bottom surface 304a as shown in the figure.

  In the present embodiment, the focus adjustment lever 201 a is disposed so as to be exposed from the right side surface of the main body cabinet 300. Therefore, as shown in FIG. 12, the projection light emitted from the light passage window 206 passes slightly above the upper surface of the main body cabinet 300 while gradually spreading and toward the projection surface. The knob portion 201b of the lever 201a exposed from the main body cabinet 300 does not block the projection light, and there is no possibility that the projected image will be shaded. Furthermore, since the knob portion 201b is arranged on the side surface of the main body cabinet 300 as described above, it is possible to prevent the projection light from being blocked by fingers operating the knob portion 201b.

  Further, since the knob portion 201b does not protrude from the side surface of the main body cabinet 300, it is difficult for the knob portion 201b to be caught by something and damaged when the projector is moved.

  Further, since the lever 201a is long and the distance between the knob portion 201b and the operation tube 201e is increased, the rotation amount of the operation tube 201e when the knob portion 201b is moved by the same amount can be reduced. it can. Therefore, it is possible to facilitate fine adjustment of the focus.

  In order to solve the problem that the fingers block the projection light, the focus adjustment lever 201a is linked by a separate linkage mechanism or the like so that the focus adjustment can be performed at a position where the fingers do not block the projection light. good. For example, an operation knob that slides in the same direction as the lever 201a is arranged on the side surface of the main body cabinet in the protruding direction of the lever 201a, and the operation knob and the lever 201a are connected by a linkage mechanism. In this case, for example, the operation knob is arranged at a position shifted from the arrangement position of the lever 201a toward the space G in FIG. If the operation knob is arranged at this position, even if the operation knob is operated at the time of focus adjustment, there is no possibility that the finger will block the projection light.

  As mentioned above, although embodiment of this invention was described, this invention is not restrict | limited by the said embodiment. For example, in the above-described embodiment, the projection lens unit has a configuration that can only adjust the focus. However, the configuration is not limited to this, and the configuration that can adjust not only the focus but also the zoom, or the configuration that can only adjust the zoom. It is good. In this case, the configuration of the operation unit for adjusting the zoom can be the configuration of the operation unit of the present invention. In addition to the above, the embodiment of the present invention can be variously modified.

201 ... Projection lens unit 201a ... Lever 201b ... Knob portion 204 ... Reflection mirror 300 ... Main body cabinet 303 ... Side panel 304 ... Knob housing portion

Claims (1)

A projection lens unit having a plurality of lenses, a mirror unit for reflecting light emitted from the projection lens unit to a projection surface,
In a projection display device comprising at least a main body cabinet that covers the projection lens unit and the mirror unit,
The projection lens unit includes a first lens group disposed on the display element side, and a second lens group disposed on the mirror unit side and having a larger diameter than the first lens group,
An operation unit for displacing the position of the lens in the projection lens unit;
The operation unit is
Attached to the second lens group;
A surface constituting a part of the main body cabinet, which is specified from a direction of light emitted from the projection lens unit to the mirror unit and a direction of light emitted from the mirror unit to the projection surface Provided on a plane parallel to the plane,
A projection display apparatus, wherein the projection display apparatus is provided so as to be movable in a direction orthogonal to the optical axis of the second lens group.

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