JP6098076B2 - Image projection device - Google Patents

Description

  The present invention relates to an image projection apparatus.

  Conventionally, based on image data from a personal computer or a video camera, the image forming unit generates a projection image using light emitted from a light source, and the generated image is projected onto a projection surface such as a screen. There is known an image projection apparatus that displays the image. In an image projection apparatus, it is desired that an image can be projected on a large screen, and that the distance between the image projection apparatus and a projection surface can be shortened as much as possible. An image projection apparatus corresponding to the distance is disclosed.

  In an image projection apparatus, a substrate on which a small image forming element called Digital Micro-mirror Receiver (hereinafter referred to as “DMD”) is mounted is provided, and the substrate is used as an optical device including a projection lens, a reflection mirror, and the like. It is used by fixing to it.

  However, when the substrate on which the image forming element is provided is displaced with respect to the optical device as described above, the angle and size of the projected image may be different from the desired one. . Such a problem occurs, for example, when a cable is inserted or removed from an input terminal or the like, and is in an electrically connected portion between the substrate provided with the input terminal and the substrate provided with the image forming element. On the other hand, as a result of applying a force, the above-described deviation occurs. In particular, in the case of an image projection apparatus corresponding to the projection distance, even a slight deviation will occur as a large deviation during projection, and thus further prevention of deviation is necessary.

  The present invention has been made in view of the above, and an object of the present invention is to provide an image projection apparatus capable of preventing a substrate provided with an image forming element with respect to an optical apparatus from being displaced.

In order to solve the above-described problems and achieve the object, the present invention provides a first circuit board provided with an image forming unit, a second circuit board provided with a data input terminal, and the second circuit board. A housing part that holds the first circuit board, a connection part that is provided on the second circuit board and is electrically connected to the first circuit board, and is fixed to the second circuit board. and e Bei and a pair of fixing portion fixed with said housing portion, said pair of fixing portions are fixed to the portion that holds the first circuit board of the housing, wherein the housing The second circuit board is fixed, and has a fixing part different from the pair of fixing parts .

  The image projection apparatus of the present invention can prevent the substrate provided with the image forming element from being displaced with respect to the optical apparatus.

FIG. 1 is a perspective view of a projector according to an embodiment. FIG. 2 is a side view of the projector according to the embodiment. FIG. 3 is a perspective view illustrating a state in which the upper cover is removed from the projector according to the embodiment. FIG. 4 is a perspective view illustrating the optical device and the light source device of the embodiment. FIG. 5 is an internal cross-sectional view illustrating the optical device and the light source device of the embodiment. FIG. 6 is a front view of the projector according to the embodiment. FIG. 7 is a perspective view of the second circuit board of the embodiment. FIG. 8 is a perspective view of the first circuit board according to the embodiment. FIG. 9 is a perspective view illustrating a state in which the optical device and the light source device of the embodiment are attached to the second circuit board. FIG. 10 is a perspective view illustrating a state where the optical device and the light source device of the embodiment are attached to the second circuit board. FIG. 11 is a perspective view illustrating a state in which the first circuit board of the embodiment is attached to the second circuit board.

  Hereinafter, an embodiment of a projector as an image projection apparatus to which the present invention is applied will be described. FIG. 1 is a perspective view of the projector 1, and FIG. 2 is a side view of the projector 1. 2 shows a state in which the projection light L emitted from the projection lens 50 of the projector 1 is irradiated on the screen 2 that is the projection surface.

  FIG. 3 is a perspective view of the optical device 3 and the light source device 4 included in the projector 1. 3 shows a state in which the upper exterior cover 1a is removed from the state shown in FIG. 1, and FIG. 4 is a perspective view of the optical device 3 and the light source device 4 arranged in a region surrounded by α in FIG. It is. FIG. 5 is an XY sectional view of the optical device 3 and the light source device 4.

  As illustrated in FIGS. 3 to 5, the optical device 3 includes an illumination mechanism 3 a and a projection mechanism 3 b. The optical device 3 includes a color wheel 5, a light tunnel 6, a relay lens 7, a plane mirror 8, and a concave mirror 9. Each of these members is provided in a housing portion 40 that constitutes the main body of the optical device 3. The optical device 3 is provided with a first circuit board 10. As shown in FIG. 8, the first circuit board 10 is provided with an image forming unit 12 formed by a DMD element which is an image forming element for forming an image. The 1st circuit board 10 is hold | maintained by the housing part 40, and the aspect of the holding | maintenance is mentioned later.

  The disc-shaped color wheel 5 converts the white light from the light source device 4 into light that repeats RGB colors every unit time and emits the light toward the light tunnel 6. The light tunnel 6 is configured in a cylindrical shape by laminating plate gases, and guides the light emitted from the color wheel 5 to the relay lens 7. The relay lens 7 is configured by combining two lenses, and collects light while correcting axial chromatic aberration of light emitted from the light tunnel 6. The plane mirror 8 and the concave mirror 9 reflect the light emitted from the relay lens 7 and guide it to the image forming unit 12 to collect it. The first circuit board 10 has a rectangular mirror surface composed of a plurality of micromirrors, and micromirrors that are written based on video and image data are driven in a time-sharing manner to form predetermined image data. Is provided with a DMD element that processes and reflects the projection light.

  The light source device 4 includes a high-pressure mercury lamp as a light source. The light source device 4 emits white light toward the illumination mechanism 3 a of the optical device 3. In the illumination mechanism 3 a, white light emitted from the light source device 4 is split into RGB and is led to the image forming unit 12. Then, the image forming unit 12 forms an image according to the modulation signal, and enlarges and projects the image on which the projection mechanism 3b is formed.

  Further, an OFF light plate that receives unnecessary light that is not used as the projection light L out of the light incident on the image forming unit 12 is vertically above the image forming unit 12 illustrated in FIG. Is provided. When light enters the image forming unit 12, a plurality of micromirrors are operated based on video data in a time-sharing manner by the action of the DMD element, and the light used by the micromirrors is reflected to the projection lens 50, and the discarded light Reflected to the OFF light plate. In the image forming unit 12, the light used for the projection image is reflected to the projection mechanism 3 b and enlarged through the plurality of projection lenses 50, and the enlarged image light is projected in an enlarged manner.

  Next, the projector 1 will be described with reference to FIG. 6 which is a front view of the projector 1 viewed from the front side which is the outer surface on the screen 2 side. As shown in FIG. 6, the projector 1 is provided with a plurality of input terminals such as a power input unit 110, an analog data input unit 111, a video RCA terminal 112, an HDMI terminal 113, a USB terminal 114, and a stereo mini jack 115. The input / output connector portion 11 is provided. The power input unit 110 is an “AC / lenlet” for inputting power. The analog data input unit 111 is “D-Sub15-Terminal” for inputting / outputting analog data to / from an external device such as a personal computer. The video RCA terminal 112 is a video input terminal. The HDMK terminal 113 and the USB terminal 114 are terminals for communicating video and audio digital signals. The stereo mini jack 115 is a terminal for inputting and outputting audio.

  FIG. 7 shows the second circuit board 20 on which the input / output connector unit 11 is provided. The connection portion 21 is provided on the second circuit board 20 on the side opposite to the end side where the input / output connector portion 11 is also received, that is, on the back side when mounted on the projector 1. The connection unit 21 functions as a connector to which the first circuit board 10 provided with the image forming unit 12 described above is electrically connected.

  FIG. 9 is a perspective view showing a state in which the optical device 3 and the first circuit board 10 are attached to the second circuit board 20. FIG. 10 is a perspective view of FIG. 9 viewed from the opposite side. FIG. 11 is a perspective view showing a state in which the first circuit board 10 is fixed to the second circuit board 20 by the fixing unit 30. As shown in FIGS. 9 and 10, the first circuit board 10 is inserted into the connection portion 15 of the second circuit board 20. At this time, the second circuit board 20 and the first circuit board 10 are substantially orthogonal to each other. In addition, the bottom of the housing part 40 that constitutes the housing of the optical device 3 is fixed to the second circuit board 20. The housing part 40 is a magnesium housing manufactured by die casting, for example.

  The second circuit board 20 is provided with a pair of fixing portions 30. As shown in FIG. 11, the lower end of the fixing portion 30 is fixed to the second circuit board 20 with, for example, screws. In addition, the fixing portion 30 has four fixing members 31 (a), 31 (b), 31 (c), and 31 (d) with respect to the portion of the housing portion 40 that holds the first circuit board 10. It is fixed by a fastening member. Note that the fixing members 31 (a) to 31 (d) also penetrate the first circuit board 10, and also function to more firmly fix the first circuit board 10 to the housing part 40. Further, another fixing portion 32 extends from the housing portion 40, and an end portion thereof is fixed to the second circuit board 20.

  The position where the fixing portion 30 is fixed is desirably in the vicinity of the connecting portion 21, and more preferably, the positions of the connecting portion 21 and the fixing portion 30 are preferably flush with each other. By providing the fixing part 30 in this way, the load applied to the first circuit board 10 is easily dispersed to the fixing part 30. In addition, the fixing portion 30 is electrically connected to the housing portion 40 and is also electrically connected to the second circuit board 20. Therefore, the electrical noise generated in the connection portion 21 is diffused through the fixed portion 30 and contributes to the reduction of noise. Moreover, the fixing | fixed part 30 is comprised, for example with the sheet metal made from a galvanized steel plate etc., compared with the housing part 40 made from magnesium, rigidity is low and it becomes easy to deform | transform with respect to load.

  Usually, since terminals for each input / output are provided on the second circuit board 20, a force is applied when a cable or the like is inserted into or removed from these terminals. At this time, since the bottom surface of the housing part 40 is fixed to the second circuit board 20, it can be considered that the housing part 40 is almost integrated with the second circuit board 20. Since it is in a state of being inserted with respect to 21, when force is applied to the second circuit board 20, it tends to concentrate on the first circuit board 10. At this time, if the first circuit board 10 is displaced with respect to the housing part 40, the projected image and video are also displaced, and the angle and size are different from the desired ones. Become.

  Therefore, in the projector 1 according to the present embodiment, the fixing portion 30 is fixed through the portion of the housing portion 40 that holds the first circuit board 10 and the second circuit board 20. Even if a force is applied to the first circuit board 10 via the connection portion 21, the force is dispersed via the fixing portion 30, so that the first circuit board 10 is prevented from being displaced with respect to the housing portion 40. Thus, contact failure and breakage of the connecting portion 21 can be prevented.

  Further, since the fixing portion 30 is fixed to the housing portion 40 inside the second circuit board 20, there is no need to newly provide a space for installing the fixing portion 30 outside the circuit board. The enlargement of the main body size of 1 can be prevented.

  Although the position where the fixing portion 30 is provided can be changed as appropriate, it is desirable that the fixing portion 30 be provided as close as possible to the position where the first circuit board 10 of the housing portion 40 is held. Further, the fixing part 30 only needs to fix at least the housing part 40 to the second circuit board 20.

DESCRIPTION OF SYMBOLS 1 Projector 1a Upper exterior cover 2 Screen 3 Optical apparatus 3a Illumination mechanism 3b Projection mechanism 4 Light source device 5 Color wheel 6 Light tunnel 7 Relay lens 8 Plane mirror 9 Concave mirror 10 First circuit board 11 Input / output connector part 12 Image formation part 15 Connection unit 20 Second circuit board 21 Connection unit 30 Fixed unit 31 Fixed member 32 Fixed unit 40 Housing unit 50 Projection lens 110 Power input unit 111 Analog data input unit 112 RCA terminal 113 HDMI terminal 114 USB terminal 115 Stereo mini jack

JP 2002-222354 A

Claims (4)

A first circuit board provided with an image forming unit;
A second circuit board having a data input terminal;
The second circuit board is fixed, and a housing portion that holds the first circuit board;
A connecting portion provided on the second circuit board, to which the first circuit board is electrically connected;
A pair of fixing parts fixed to the second circuit board and also fixed to the housing part;
Bei to give a,
The pair of fixing portions are fixed to a portion of the housing holding the first circuit board,
The image projection apparatus according to claim 1, wherein the housing has a fixing portion different from the pair of fixing portions to which the second circuit board is fixed . The image projection apparatus according to claim 1 , wherein the fixing portion is fixed to the housing portion and the first circuit board by a common fixing member. The image projection apparatus according to claim 1, wherein the fixing portion is fixed inside an end portion of the second circuit board. The image projecting apparatus according to claim 1, wherein the fixing portion electrically connects the second circuit board and the housing portion.