JP2009025840A - Projection type video display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection type video display device capable of protecting a projection lens and an operation member from dust and impact. <P>SOLUTION: In the projection type video display device, the operation member 4 that is turnably operated for adjusting zoom and focus of the projection lens 2 is arranged near the projection lens 2, a slide cover 7 freely slidably covering the projection lens 2 and the operation member 4 is slidably engaged with a slide holder 9, and also forming a holding mechanism with the slide holder 9, whereby it is nearly integrated with the slide holder 9, and the slide cover 7 is supported inside a body case 1 to freely slide between the body case 1 and the slide holder 9 attached to the body case 1, in the same direction as the turning direction of the operation member 4, and the slide cover 7 is held by the holding mechanism in such a state that it covers the projection lens 2 and the operation member 4. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a projection-type image display device such as a liquid crystal projector that displays an image by modulating light from a light source based on an image signal and projecting it through a projection lens exposed from an opening on the front surface of a main body case. It is.

  In this type of projection display device, when no image projection is performed, projection may occur due to dust adhering to the glass surface of the projection lens exposed from the opening on the front surface of the main body case or intrusion from a gap or the like. Adversely affects performance. In particular, since the projection lens portion is vulnerable to impact, it may be damaged by impact such as hitting something when the apparatus is moved.

  For this reason, conventionally, a cap-type lid is fitted into the tip of the projection lens, and the opening where the projection lens is exposed can be opened and closed with a lid that slides sideways (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. H10-228561 discloses a device in which the front side of the main body case provided with a projection lens can be opened and closed with a detachable cover, an openable / closable cover, or a slidable slidable cover.
JP 11-64971 A (G03B 21/00, G02F 1/13) JP 2002-344848 (H04N 5/74, G03B 21/00)

  By the way, the projection lens generally has a function of adjusting zoom, focus, and the like, and there are a lens that can be adjusted electrically, and a lens that can be adjusted manually for cost reduction in a low-priced model. In the case of this type of manual adjustment, it is preferable to expose an operation member such as an adjustment dial by providing an opening on the adjacent surface of the front surface of the main body case, for example, the upper surface of the main body case in consideration of operability.

  However, when configured as described above, the operation opening formed on the upper surface of the main body case or the like cannot be closed with the lid or cover disclosed in Patent Documents 1 and 2 described above. The projection lens part cannot be protected against dust and impact from the part. Accordingly, the present invention has been made to solve such problems, and an object thereof is to provide a projection display apparatus capable of protecting the projection lens and the operation member from dust and impact. is there.

  The means for solving the above-mentioned problems is a projection-type image display device that displays an image by modulating light from a light source based on an image signal and projecting it through a projection lens exposed from the front surface of the main body case. An operation member that is rotated to adjust the zoom and focus of the lens is disposed in the vicinity of the projection lens, and a slide cover that slidably covers the projection lens and the operation member is slidably engaged with the slide holder. By forming a holding mechanism between the slide holder and the slide holder, the slide cover can be substantially integrated with the slide holder, and the slide cover is located inside the main body case and between the main body case and the slide holder attached to the main body case. And is slidably supported in the same direction as the rotation direction of the operation member and is slid by the holding mechanism. Wherein the cover is configured to be held in a state of covering the projection lens and the operating member.

  According to the configuration of the present invention, when performing image projection, it is possible to project an image from the projection lens, and it is possible to adjust the zoom and focus of the projection lens by operating the operation member. Further, when image projection is not performed, the slide lens and the operation member can be protected from dust and impact by the slide cover.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS.

  FIG. 1 is a perspective view of an embodiment of a liquid crystal projector as a projection display apparatus according to the present invention as seen obliquely from above, and FIG. 1 (a) shows a state in which an opening is closed, and FIG. Indicates an open state. 2 (a) and 2 (b) are plan views, FIG. 2 (c) and FIG. 2 (d) are front views, FIG. 2 (e) is a side view, and FIG. 2 (a) and FIG. (B) and (d) show a state in which the opening is opened. FIG. 3 shows the A-A ′ cross section to the E-E ′ cross section of FIG. 2.

  A projection lens opening 3 for exposing the projection lens 2 to the left of the front surface 1a is formed in the main body case 1 of the liquid crystal projector, and a projection lens opening is formed on the upper surface 1b adjacent to the front surface 1a. Corresponding to the part 3, there is formed an operation opening 5 for exposing the adjustment dial 4 which is an operation member for adjusting the zoom and focus of the projection lens 2.

  The operation opening 5 is formed in a horizontally long rectangular shape corresponding to the adjustment dial 4 that is rotated in the horizontal direction. The positional relationship between the adjustment dial 4 and the operation opening 5 is described below between the uppermost part of the adjustment dial 4 and the operation opening 5 as shown in FIGS. The slide cover 7 is set to have an interval through which the upper cover portion 7b passes. Thus, even if the adjustment dial 4 is provided at a position lower than the operation opening 5, the adjustment dial 4 is operated with a fingertip such as an index finger through the operation opening 5, so that it can be sufficiently operated.

  The projection lens opening 3 and the operation opening 5 are arranged on the inner surface side of the main body case 1 by an opening / closing mechanism including a slide cover 7 and the like in which a front cover portion 7a and an upper cover portion 7b are integrally formed. It is configured so that it can be opened and closed simultaneously with one operation.

  This will be specifically described with reference to FIG. 4A is an exploded perspective view of the main part when the bottom plate 1c of the main body case 1 is removed, FIG. 4B is a perspective view of the main part showing a state in which the slide cover 7 is opened, and FIG. It is a principal part perspective view which shows the state which closed. As shown in FIG. 4, the opening / closing mechanism 6 is formed in an inverted L-shaped cross section that can open and close the projection lens opening 3 on the front surface 1a of the main body case and the operation opening 5 on the upper surface 1b of the main body case. A slide cover 7 is provided.

  The slide cover 7 is made of a transparent or translucent member, and a pair of guide long holes 7c and 7c are formed on the front and rear sides of the upper cover part 7b for opening and closing the operation opening 5, and the guide long hole 7c. , 7c, and is slidably screwed with a pair of guide screws 8 and 8 to one side end of the operation opening 5 so as to be slidable in the lateral direction.

  As shown in FIGS. 1 and 2, the upper cover 7 b that opens and closes the operation opening 5 protrudes into the operation opening 5 on one end side in the sliding direction to become a slide operation knob. In addition, a convex portion 7d that defines the slide range is formed.

  Here, as an example, the guide long hole 7 c is formed on the upper cover portion 7 b side of the slide cover 7, and the guide screw 8 is provided on one end of the operation opening 5. A guide slot may be formed on the side 7a, and a guide screw may be provided at one end of the projection lens opening 3. Further, guide grooves for guiding the upper and lower edges of the slide cover 7 may be formed.

  In the above configuration, when image projection is performed, first, the projection opening 5 and the operation opening 5 are closed by the slide cover 7 as shown in FIG. By operating the projection 7d formed on the upper cover portion 7b with the index finger or the like on the opposite side with the tip of the index finger or the like, the slide cover 7 is slid in the horizontal direction and projected as shown in FIG. The lens opening 3 and the operation opening 5 are opened.

  Then, by turning on the power of the liquid crystal projector main body and turning on the light source composed of an unillustrated ultra-high pressure mercury lamp or the like, the light from the light source is split into RGB color lights via an optical system (not shown) and split. The RGB color lights are modulated on the basis of the video signal through the corresponding three liquid crystal panels, and the modulated RGB color lights are synthesized by a color synthesis prism or the like, and an image is enlarged and projected from the projection lens 2 onto the screen. Furthermore, since the operation opening 5 is also opened, the zoom, focus, etc. of the projection lens 2 are adjusted by operating the adjustment dial 4 exposed therefrom with the fingertip.

  On the other hand, when the image projection is not performed, the light source is turned off, and the projection lens opening 3 and the operation opening 5 are opened as shown in FIG. By operating the convex portion 7d formed on the cover portion 7b to the opposite side with the fingertip, the slide cover 7 is slid in the lateral direction, and the projection lens opening 3 and the operation portion are operated as shown in FIG. The opening 5 is closed. In this way, by closing the projection lens opening 3 and the operation opening 5, the projection lens portion is protected from dust and impact with respect to both the projection lens opening 3 and the operation opening 5. Will be able to.

  Further, according to the present embodiment, the operability and the like are improved by forming the operation opening 5 on the main body case upper surface 1b. On the other hand, particularly when used in a classroom using a blackboard, the chalk powder is particularly generated on the upper surface of the main body case. Although it becomes a problem by invading from the operation opening 5 formed in 1b, this problem is also solved by the slide cover 7 having the above-described configuration. .

  The operation opening 5 on the upper surface 1b of the main body case is formed to correspond to the adjustment dial 5 operated in the lateral direction, and the slide cover 7 is provided with the opening 3 for the projection lens on the front surface 1a of the main body case and the upper surface 1b of the main body case. The operation opening 5 can be opened and closed and is formed in an inverted L-shaped cross section so as to be slidable in the lateral direction. Therefore, the slide cover can be operated with a simple configuration and the same operation as that of the adjustment dial 4. 7 can be opened and closed, and the operation is extremely simple.

  In addition, since the slide cover 7 is made of a transparent or translucent member, the light source can be easily turned on / off even when the projection lens opening 3 is closed by the slide cover 7. Forgetting to turn off can be surely prevented.

  Furthermore, if the slide cover 7 is made of a transparent member, it is possible to project an image even when the projection lens opening 3 is closed by the slide cover 7. As an advantage of this configuration, this type of projection display device can be used on the floor or desk depending on the application, etc. In this case, the opening / closing operation of the slide cover 7 is difficult. However, if the projection lens opening 3 is closed by the slide cover 7, the image can be projected even if the projection lens opening 3 is closed. Is not necessary and convenience is improved.

  When the slide cover 7 is closed, the adjustment dial 4 such as zoom and focus cannot be operated. However, in the case of the ceiling suspension, since it is a fixed installation, there is no problem because the adjustment is performed at the time of installation.

  Further, when an image is projected with the slide cover 7 closed, if the slide cover 7 is heated to a high temperature and distorted by high luminance light, the projected image is also distorted. It is important to use a transparent member such as heat-resistant glass that does not cause any problems.

  Furthermore, in this embodiment, since the projection lens opening 3 and the operation opening 5 are formed independently, the strength of the main body case 1 can be improved as compared with the case where they are formed in communication. it can.

  Although the manual opening / closing mechanism 6 has been described in the above embodiment, the light source is turned off using a shape memory alloy, paying attention to an electric opening / closing mechanism using a motor or the like, or a temperature rise due to high-intensity light from the light source. It is also conceivable that the opening is closed when the room temperature is normal, and the opening is opened when the light source is turned on (during image projection).

  Moreover, in the said embodiment, although the operation opening part 5 was formed in the main body case upper surface 1b, it is also possible to form in the main body case bottom face and main body case side surface which are surfaces adjacent to the main body case front surface 1a. In the case of the bottom surface of the main body case, it is the reverse of the above embodiment, and in the case of the side surface of the main body case, if the height of the main body case is high and can be slid up and down, a slide cover substantially similar to the above embodiment can be used However, when the height of the main body case is low and cannot be slid up and down, it can be realized by using a flexible slide cover or an arc-shaped slide cover.

(Second Embodiment)
5 to 9 show a second embodiment of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the first embodiment, the slide cover 7 is simply slid. In the second embodiment, the slide cover 70 opens the projection lens opening 3 and the operation opening 5, and closes. In this state, the holding mechanism is used for holding.

  As shown in FIG. 5, the slide cover 70 constituted by a substantially L-shaped plate is configured to be slidable with respect to the slide holder 9 in a state of covering the slide holder 9 also constituted by a substantially L-shaped plate. Has been.

  As shown in FIG. 6, the slide cover 70 has a groove portion 10 that opens in a substantially U shape along the sliding direction of the front cover portion 70 a, and communicates with the groove portion 10, and one side in the sliding direction of the front cover portion 70 a. And a claw portion 11 having elasticity protruding in a direction orthogonal to the outside of the groove portion 10, a recess portion 12 opened in a substantially U shape on the other side in the sliding direction of the upper cover portion 70 b, An engaging claw portion 13 having elasticity that protrudes from one facing wall to the other wall is formed.

  A plurality of projecting portions 14 projecting toward the slide holder 9 are provided on the slide holder 9 side of the front cover portion 70a, and a side facing the slide holder 9 is projected on the side facing the slide holder 9 on the side facing the slide holder 9. A plurality of protrusions 15 are formed.

  Further, the slide holder 9 has a protrusion 16 slidably engaged with the groove portion 10 of the slide cover 70, a latching portion 17 detachably engaged with the claw portion 11 of the slide cover 70, and a slide. A protrusion 18 that protrudes in the sliding direction toward the front cover 70 a side of the cover 70 and a screw attachment portion 20 that is attached to an engagement boss 19 formed on the main body case 1 by a screw (not shown) are formed.

  As shown in FIG. 5, the groove portion 10 of the slide cover 70 is engaged with the protrusion 16 of the slide holder 9 to be substantially integrated, and as shown in FIG. 8, the engagement boss 19 of the main body case 1 is engaged with the engagement boss 19 of the slide holder 9. The screw attachment portion 20 is attached by a screw (not shown). By doing so, the slide cover 70 is slidably attached to the main body case 1 via the slide holder 9.

  The slide cover 70 is slidably slidable with respect to the slide holder 9 with the protrusion 16 of the slide holder 9 serving as a guide. The slide holder 9 is formed with a protrusion 18 that protrudes along the sliding direction on the slide cover 70 side, and the slide cover 70 is formed with a plurality of protrusions 14 that protrude toward the slide holder 9. Therefore, the slide cover 70 does not contact the entire surface of the slide holder 9 but partially contacts. Further, since the plurality of projecting portions 15 are formed on the main body case 1 side of the slide cover 70, the sludge cover 70 does not contact the entire surface of the main body case 1. Therefore, a smooth slide operation of the slide cover 70 can be performed.

  As shown in FIG. 8, when the slide cover 70 closes the projection lens opening 3 and the operation opening 5, the claw portion 11 of the slide cover 70 is moved to the slide holder as shown in FIG. 9, the slide cover 70 is held in a state where the projection lens opening 3 and the operation bright rear portion 5 are closed. Accordingly, it is possible to prevent dust from intruding into the projection lens opening 3 and the operation opening 5 by unexpectedly opening the slide cover 70.

  Further, as shown in FIG. 9, when the slide cover 70 opens the projection lens opening 3 and the operation bright rear portion 5, the engaging claw portion 13 of the slide cover 70 is formed in the main body case 1. This state is maintained by engaging the locking boss 21. Therefore, it is possible to prevent the slide cover 70 from obstructing the projection from the projection lens due to the slide cover 70 closing unexpectedly.

  In the second embodiment described above, the slide cover 70 is provided with the plurality of protrusions 14 protruding toward the slide holder 9, but the slide cover 70 may be configured without the protrusions 14. Even in this configuration, the slide cover 70 does not contact the entire surface of the slide holder 9 by the protrusion 16 of the slide holder 9 but partially contacts.

  In the first embodiment and the second embodiment, the liquid crystal projector using the liquid crystal panel is shown as the projection image display device. However, the invention of the present application is also applied to the projection image display device having another image light generation system. Can be applied. For example, the present invention can also be applied to a projector using a DLP (Digital Light Processing; registered trademark of Texas Instruments (TI)) system.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a first embodiment of a liquid crystal projector as a projection display apparatus according to the present invention as viewed obliquely from above, with (a) showing a state in which the opening is closed and (b) showing a state in which the opening is open. Indicates. In the plan views (a), (b), the front views (c), (d) and the side view (e) of the liquid crystal projector, (a) and (c) are the states in which the opening is closed, and (b) (D) shows a state in which the opening is opened. 2 shows the AA ′ cross section to the EE ′ cross section of FIG. 2, (a) is the AA ′ cross sectional view of FIG. 2 (c), and (b) is the EE ′ cross section of FIG. 2 (d). FIG. 2C is a sectional view taken along the line BB ′ of FIG. 2A, FIG. 2D is a sectional view taken along the line DD ′ of FIG. 2B, and FIG. 2E is a sectional view taken along line CC ′ of FIG. It is sectional drawing. It is a figure which shows the principal part of the said embodiment, (a) is a principal part disassembled perspective view which removed the bottom plate of the main body case, (b) is a principal part perspective view which shows the state which the slide cover opened, (c). FIG. 3 is a perspective view of a main part showing a state in which a slide cover is closed. It is a perspective view which shows the state which assembled the slide cover and slide holder of 2nd Embodiment of the liquid crystal projector as a projection type video display apparatus concerning this invention. It is a disassembled perspective view of the slide cover and slide holder of the liquid crystal projector. It is the perspective view which looked at the slide cover of the said liquid crystal projector from the back side. It is the perspective view which looked at the state which closed the projection lens opening part and the operation opening part of the above-mentioned liquid crystal projector from the body case back side. It is the expansion perspective view which looked at the state which opened the opening part for projection lenses of the above-mentioned liquid crystal projector, and the opening part for operation from the main part case back side. It is the perspective view which looked at the slide cover of other forms of the above-mentioned liquid crystal projector from the back side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body case 1a Front 1b Top 1c Bottom plate 2 Projection lens 3 Projection lens opening 4 Adjustment dial (operation member)
5 Opening for Operation 6 Opening / Closing Mechanism 7 Slide Cover 7a Front Cover 7b Upper Cover 7c Guide Slot 7d Convex 8 Guide Screw

Claims (1)

To adjust the zoom and focus of the projection lens in a projection-type image display device that displays light by modulating light from a light source based on a video signal and projecting it through a projection lens exposed from the front surface of the main body case An operating member to be rotated is disposed in the vicinity of the projection lens, and a slide cover that slidably covers the projection lens and the operating member is slidably engaged with the slide holder and has a holding mechanism between the slide holder and the slide holder. By forming, it is configured so that it can be substantially integrated with the slide holder, the slide cover is inside the main body case, and the same rotation direction of the operation member between the main body case and the slide holder attached to the main body case The slide cover is supported by the holding mechanism so as to be slidable in the direction, and the projection lens and the operation member Projection display device characterized by being configured to be held in the covered state.