JPH11316418A - Projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safe projector which is so constituted that a dustproofing filter is easily made attachable. SOLUTION: This liquid crystal projector is provided with a base plate 6, on which members housed in the inside of an armor case constituted of a lower case 1 and an upper case 2 are loaded. The plate 6 is arranged so as to be interposed on the bottom surface of the case 1. Then, the plate 6 is provided with a ventilating hole 6c, and the case 1 is provided with a ventilating hole 1i. The holes 6a and 1i are arranged so that they do not coincide with each other when they are viewed in a plane. Thus, since a heating source and a high voltage source become hard to be brought directly into contact from the outside, prevention of hazard situation can be made. Moreover, since the dustproofing filter 18 can be slid along the surface of the case 1, it is easily made attachable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal projector using a liquid crystal light valve.

[0002]

2. Description of the Related Art Conventionally, as shown in the drawing of Japanese Patent Application Laid-Open No. 1-302387, a rectangular parallelepiped case 1 as an exterior case has four members of a bottom plate 1A, a front plate 1B, a back plate 1C, and a top plate 1D. The interface circuit and input / output terminals for taking in video / audio signals input from the outside are directly incorporated in the rear panel 1C, and the names and applications of the input / output terminals are the input / output terminals of the vertical rear panel 1C. It was displayed in the vicinity of the output terminal device by marking or printing. Also,
The interface circuit and the input / output terminals were fixed directly to the back plate 1C with screws or fixed to other members with screws, and the other members were fixed or welded to the back plate 1C with screws at several points to the bottom plate 1A and the top plate 1D. Further, in the prior art, the exhaust hole disposed in the vicinity of the cooling fan is covered with a cover having a hole that does not directly touch the cooling fan from the outside, and the cover is also used as, for example, the top plate 1D. It is constituted by fixing it to the face plate 1C with screws, and an exhaust duct is installed on the back side. Further, in the prior art, the projection lens 18
The lens cover 5 is mounted on the outside of the front plate 1B so as to be slidable in the left-right direction, and is used by opening and closing operations. Further, in the prior art, when fixing the liquid crystal projector main body, or installing the main body on a ceiling or a wall, the main body of the liquid crystal projector is housed in a dedicated mounting frame or the main body of the liquid crystal projector is fixed with a band or the like. Further, in another conventional technique, when another member such as an anamorphic lens or a reversing mirror is attached to the outside of the projection lens, a member that cannot be directly attached to the projection lens is provided with a groove in the outer case (front plate 1B) or a threaded portion. And hooked them or fixed them with screws. Further, in the prior art, the foot and the foot adjuster 2 mounted for adjusting the height or tilting the liquid crystal projector main body had a substantially cylindrical outer shape and a flat bottom. In still another conventional technique, a dust filter provided on an intake side of a cooling fan is disposed on a side surface of the liquid crystal projector main body, is sandwiched between the liquid crystal projector main bodies by a filter cover, is fixed, and is detachable. In addition, a dustproof filter is inserted into a groove provided in the liquid crystal projector main body, and an arbitrary angle of inclination and an R-shaped deformation provided in a cross-sectional shape of the dustproof filter generate a shimeshiro, which is fixed and detachable.

[0003]

However, in the prior art, since the outer case is roughly divided into a bottom plate, a front plate, a back plate, and a top plate, each member becomes a large part. In addition, when performing injection molding, press molding, etc., the cost of the mold is enormous and handling becomes difficult. Furthermore, since each member is separated, the number of joints increases, the joining method and the fixing method become complicated, the number of parts and the number of assembling steps increase, and the cost increases. In addition, since there are many joints and the fixing method is complicated, restrictions are imposed on the appearance and design, and it has been difficult to provide a liquid crystal projector having an exterior case with a beautiful appearance. In order to improve this, the front and back panels, which are large parts, are eliminated, and the upper and lower cases have the bottom and top plates with their functions. Mold costs can be reduced, but in practice, it is not possible to simply configure the upper and lower cases only by considering the workability and assemblability of the parts, so parts are blocked according to each function as necessary Has the following problems in function and handling.

(1) An interface circuit and an input / output terminal for taking in a video / audio signal inputted from the outside are directly incorporated in the rear plate, and the names and applications of the input / output terminals are defined as the input / output terminals of the vertical rear plate. It is displayed by engraving and printing near the output terminal unit, but depending on the usage of the liquid crystal projector, it can be placed on the floor, on a desk, on a ceiling, or installed on a high place. You have to look down and look up the name and use indication,
Nevertheless, in high places and low places, the display on the vertical back plate cannot be confirmed unless the eyes are close to the place.

(2) When the interface circuit and the input / output terminal are directly screw-fixed to the back plate, the screws are exposed to the external appearance, which limits the degree of freedom in design. or,
Screw the interface circuit and input / output terminals to other members and fix or weld the members to the back plate with screws.
When screws are fixed to the top plate at several points, the same problem occurs with screw fixing, and other members increase in welding and the number of processing steps also increases. Furthermore, since a large force is applied to the input and output terminals during insertion and removal, it is difficult to fix the back plate with a few screws to the bottom plate and top plate due to the strength, and conversely, adding more screw fixing parts limits the appearance There is a problem of becoming.

(3) The cooling fan cover is constituted by a hole that does not directly touch the cooling fan, and its arrangement is also used as the top plate or fixed to the back plate with screws. There is such a problem. In addition, since the exhaust duct is provided, there is also a problem of increasing the number of parts and the space.

(4) Since the lens cover is located outside the front plate and is opened and closed by sliding in the left-right direction, the size of the liquid crystal projector body can be reduced in size by projecting only the projection lens portion. The left and right strokes of the lens cover must secure a space as the minimum projection of the liquid crystal projector main body, and even if the projection lens is small, space saving cannot be achieved. Further, since the lens cover is always exposed to the outside of the front plate and the handling operation (opening / closing operation) is frequent, there is a disadvantage that the appearance is apt to be scratched or stained.

(5) When the liquid crystal projector is fixed or installed on a ceiling or a wall, the liquid crystal projector body is housed in a dedicated mounting frame or a band or the like so as not to be easily dropped or moved. However, even if it is stored in the dedicated mounting frame, it will not be completely mounted because there is no fixing part such as screws on the LCD projector main body, and the band fixing will also scratch the LCD projector main body There's a problem.

(6) When other components are attached to the outside of the projection lens, for example, a conversion lens which is directly attached to the projection lens and does not affect the function even if the projection lens moves does not matter. For example, an anamorphic lens is used. If the lens is attached directly to the projection lens, such as a mirror or a reversing mirror, the movement of the projection lens will affect the function that was initially set, which must be installed separately from the projection lens.
Although a groove or a screw portion is provided in the outer case and these parts are hooked or fixed with screws, there is a problem that the outer case is flawed and the appearance is restricted in terms of design.

(7) Since the foot and the foot adjuster have a substantially cylindrical shape and a flat bottom surface, the outer end of the cylindrical shape is grounded when the foot adjuster is moved when adjusting the height of the liquid crystal projector or tilting the main body. There is a problem that the operation is unstable and the position cannot be determined.

(8) The dustproof filter is located on the side surface of the liquid crystal projector main body, and is detachable by being sandwiched between the main body of the filter cover. However, one component called the filter cover is required and the number of components increases. There is. In addition, the dust filter is inserted into the groove provided in the LCD projector body. This can be fixed by tilting the dust filter at an arbitrary angle when viewed in cross section or by adding a round shape to the dust filter when it is inserted. However, there is a problem in that it is difficult to set an arbitrary angle of inclination and an R shape, and there is a problem in that the shape of the part is deformed and used, so that if the shape becomes dull, it cannot be fixed.

Accordingly, the present invention eliminates the above-mentioned problems and reduces the number of parts, processing steps and assembling steps, is inexpensive, has a good design and is beautifully designed, and has excellent functions and handling. The purpose is to provide products of excellent quality.

[0013]

The liquid crystal projector of the present invention comprises: (1) a white light source, a reflector, a light source driving power supply circuit for driving the white light source, a window holding the white light source and the reflector and emitting a light beam. An optical unit incorporating a liquid crystal light valve for image formation, a dichroic mirror for light separation / synthesis, an optical filter, a prepolarizer, a condenser lens, a box light guide, and a projection lens. A cooling fan for cooling the heating element, an interface circuit for taking in video and audio signals input from the outside, a video circuit for converting an analog video signal into a digital signal and controlling it, and a liquid crystal light for image formation based on a signal from the video circuit Drive circuit for driving and controlling a valve, power supply for supplying drive energy for each of the circuit groups Road, a machine frame that holds and mounts each circuit group and each member, a lower case that houses and mounts the machine frame mounted with each circuit group and each member, an upper case that covers and seals the lower case, In a liquid crystal projector composed of side covers, cooling fan covers, interface frames, operation panels, lens covers, infrared filters, etc.
The interface frame may include an input / output terminal mounting surface and at least one type of surface having a different angle from the input / output terminal mounting surface.

(2) In the liquid crystal projector according to the preamble of claim 1, the interface frame is:
A surface orthogonal to the input / output terminal mounting surface is arranged on the base board, the end of the interface frame is engaged with the concave groove provided in the lower case, and the input / output terminal mounting of the interface frame is mounted on the convex portion of the lower case. A concave portion of a surface orthogonal to the surface is engaged, a screw fixing portion is provided in the engaging portion, and the interface frame is disposed so as to sandwich the interface frame between the upper case and the lower case.

(3) In the liquid crystal projector according to the preamble of the first aspect, the cooling fan cover has a two-stage convex shape on the entire circumference, and the cooling fan cover has a first level (the most protruding portion on the entire circumference). ) Engages with the concave groove of the lower case, is disposed so that the side portion is sandwiched between the lower case side wall and the rib, and is provided with a screw fixing portion in the interlocking portion. The cooling fan cover is disposed so as to sandwich the cooling fan cover.

(4) In the liquid crystal projector according to the preamble of claim 1, the lens cover for covering and protecting the projection lens is formed with an R surface, and the upper and lower cases are each provided with the R surface. And a concave groove having the same curvature as that described above, and the concave groove is set so that the lens cover slides.

(5) In the liquid crystal projector according to the first aspect of the present invention, a mount screw portion that can be joined to another member is provided on the bottom surface (outside) of the lower case.

(6) In the liquid crystal projector according to the preamble of claim 1, a mounter fixed to the outside of the projection lens (light exit side) so as not to obstruct the path of a light beam emitted from the projection lens. A member, and a window portion of the mounter fixing member is provided with at least one mounter claw or a screw portion on which another member can be easily attached, and a claw corresponding to each of the other members to be attached. It is characterized by providing a screw portion.

(7) In the liquid crystal projector according to the preamble of claim 1, a Z-shaped mounter fixing member is provided on a side wall of a machine frame that holds and mounts each of the circuit groups and members, The mounter fixing member is provided with a leg portion that escapes part or all of the outer shape of the projection lens, and a window portion that does not hinder the path of a light beam emitted from the projection lens.

(8) In the liquid crystal projector according to the first aspect of the present invention, the infrared filter for protecting the auto-focus distance measuring section provided in the projection lens has an L-shaped cross section. The infrared filter is housed in a concave groove provided in the lower case and sealed and fixed with a lens frame. The infrared filter is further provided with an infrared emitting light portion of an autofocus distance measuring portion of the projection lens. It is characterized by having a partition rib for separating the part.

(9) A liquid crystal projector comprising the preamble of claim 1, having a pair of movable foot adjusters at one of the front and rear of the liquid crystal projector main body and a pair of fixed feet at one of the other front and rear. Wherein the foot adjuster and the bottom of the foot are formed in an R surface or a substantially spherical shape.

(10) In the liquid crystal projector constituted by the preamble of claim 1, a machine frame for holding and mounting each of the circuit groups and other members existing below the circuit group as a heat source. The lower case is provided with ventilation holes, and the ventilation holes are arbitrarily shifted or completely shifted so that they do not completely coincide.

(11) Consisting of the preamble of claim 1,
In the liquid crystal projector in which the intake side of the cooling fan is installed on the bottom surface of the main body, a dustproof filter integrally formed with the lower case is provided at the bottom of the liquid crystal projector main body on the front side of the lower case, and the lower case and The dustproof filter is configured to slide in a groove formed by the dustproof filter fixing frame, and one of the irregularities is provided on a part of the dustproof filter, and a position corresponding to one of the irregularities is provided. In addition, one of the irregularities opposite to the dustproof filter is provided on the dustproof filter fixing frame.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the liquid crystal projector according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a plan view showing the internal structure of a liquid crystal projector according to an embodiment of the present invention. FIG. 2 is a plan view of the same embodiment of the present invention except that the optical unit 10 and the drive circuit 14 are removed. 3 to 7 are views showing the appearance of the embodiment of the present invention. FIG. 3 is a plan view and FIG.
5 is a front view, FIG. 5 is a rear view, FIG. 6 is a side view, and FIG. 7 is a bottom view.

The outer case of the present invention is mostly constituted by a lower case 1 and an upper case 2 as shown in FIGS.
In addition, lower case 1 and upper case 2 are unitized for each function.
The interface frame 3, the cooling fan cover 4, and the side cover 5, which are more advantageous to be separated from each other, have a structure that can be separated by the case screw fixing portions 1a, 1b, 2a. As shown in FIGS. 1 to 6, the lower case 1 partially has cutouts 1e, 1f, 1g, and 1h, but has a substantially lunch box shape. A machine frame (hereinafter, referred to as a base plate) 6 on which each circuit group and each member are mounted is provided on the lower case 1.
The base plate 6 is provided with reinforcing ribs 6a and bent portions 6b for securing strength and rigidity, and is further integrated with the lower case 1 by several screws to improve the strength. On the base plate 6, a white light source and a reflector 7, a window holding the white light source and the reflector 7, and having a window for emitting light, covering the others, shielding and reinforcing the lamp housing 8, and a white light source (not shown) are driven. Light source drive power supply circuit (hereinafter referred to as ballast) 9, liquid crystal light valves 10a, 10b and 10c for image formation, dichroic mirror for light separation / combination, optical filter, condenser light guide 10d incorporating a condenser lens, etc., and a projection lens 20
, A cooling fan 11 for cooling a heating element, and a video circuit 1 for converting an analog signal of a video signal from an interface circuit 12 that receives a video / audio signal input from the outside into a digital signal and controlling the digital signal.
3, a drive circuit 14 for controlling and driving information to the liquid crystal light valve for image formation by a digital signal from the video circuit 13 and a power supply circuit 15 for supplying drive energy of the circuit group are mounted, and each is directly screwed to the base plate 6. Fixing or younger fixtures 11a, 13a, 1
4a and the like.

As shown in FIGS. 8, 9 and 10, the interface circuit 12 has an input terminal and an output terminal for taking in video and audio signals from the outside (in particular, the input terminals are a video input terminal 12a, audio input terminals 12R and 12L, S input terminal 12
S, analog RGB terminals 12b, etc.) are mounted, and are fixed to bosses 3a provided on the interface frame 3 with screws. The interface frame 3 and the interface circuit 12 are formed in the lower case 1 so as to be vertically set with respect to the main body of the liquid crystal projector.
The side edge 3b of the interface frame 3 is engaged with the concave groove 1k for positioning, and the interface frame 3 is sandwiched and fixed between the lower case 1 and the upper case 2.
The interface frame has an upper inclined surface 3d and a lower inclined surface 3e having an arbitrary angle with respect to the vertical surface in addition to the vertical surface around the input terminals, and each input device mounted on the interface circuit 12 on these inclined surfaces. The name and use of the output terminal are indicated by engraving or printing. In such a structure, depending on the usage of the liquid crystal projector, it can be considered to be placed on the floor, on a desk, on a ceiling, or installed on a high place. Although it is necessary to look up and look up, since the names and use indications of the respective input / output terminals are displayed on the upper slope 3d and the lower slope 3e, there is an effect that the user can confirm even if he does not look at the place. Further, the interface frame 3 and the interface circuit 12 are cut out in the lower case 1 so that the interface frame 3 and the interface circuit 12 can be set upright with respect to the liquid crystal projector main body.
e, the side end 3b of the interface frame 3 is engaged with the concave groove 1k in the vicinity of the left and right sides to position the interface frame 3, and the interface frame 3 is sandwiched and fixed between the lower case 1 and the upper case 2; Because it is not exposed to the exterior, there is no restriction on the degree of freedom in design, and a neat design can be provided. In addition, the input / output terminal portion is provided with a large force for insertion / extraction at the time of mounting, but can easily cope with the strength and can provide a solid structure.

As shown in FIGS. 1, 2, 11, and 12, the cooling fan cover 4 is formed in a two-stage convex shape around the entire circumference, and the first lowermost portion 4b of the convex shape (the most protruding portion around the entire circumference) is a lower case. The first groove 4m with the cooling fan cover 1 has a first-stage side portion 4a having a convex shape.
Are engaged with the side wall 1q and the reinforcing rib 1n of the lower case 1, respectively.
The cooling fan cover 4 is positioned and screw-fixed with the screw fixing portion 4c, and furthermore, the cooling fan cover 4 is sandwiched and fixed between the lower case 1 and the upper case 2. For this reason, similarly to the first embodiment, since the screws are not exposed on the external surface, the degree of freedom in design is not limited, and a neat design can be provided.
It has the effect of providing a solid structure that can easily respond to a large external force in terms of strength.

As shown in FIG. 1, FIG. 2, FIG. 16, and FIG. 17, the lens cover 21 is formed in an R-shape and is arranged so as to cover and protect the projection lens 20 at a position where the movement of the projection lens 20 is not hindered. Have been. The lens cover groove 1p of the lower case 1, the lens cover guide 2d of the upper case 2, and the lens frame 24 have the same curvature R as the R surface of the lens cover 21, and the lens cover 21 smoothly slides along the R shape. The lens cover 21 is held so as to be movable. In such a structure, the trajectory of the lens cover 21 becomes a rotational trajectory in the circumferential direction by making the lens cover 21 into the R surface, compared to the conventional left and right opening and closing. Therefore, the projection lens portions 1d and 2b of the upper and lower cases are The shape has been reduced according to the shape of this trajectory,
In addition, since the lens cover 21 is located inside the upper and lower cases, even if the handling operation (opening / closing operation) is frequent, there is an effect that scratches, dirt and the like are hardly attached to the appearance.

As shown in FIG. 7, one or more mounting screw portions 1c that can be joined to other members are provided on the outer bottom surface of the lower case 1 at arbitrary positions, so that screws can be easily fixed to other members. In addition, when the liquid crystal projector is installed on a ceiling or on a wall, the problem of dropping, moving, or shifting of the liquid crystal projector main body and scratches can be solved.

As shown in FIGS. 13, 14, and 16, the lens fixing plate 23 of the mounter fixing member is located outside the projection lens 20 (light exit side) and does not obstruct the path of the light beam emitted from the projection lens 20. And a leg 23a that escapes part or all of the outer shape of the projection lens 20 and has a square Z-shape in cross-section, and is screw-fixed to the bent part 6b of the base plate 6, and further lowered through the lens frame 24. The case 1 is screw-fixed to the projection lens protrusion 1d. Also, a lens fixing plate 2
3 is provided with at least one or more mounting portions 23b which can be easily attached to other members in the window by reinforcing portions 23b which are bent to improve strength. In such a structure, the claw corresponding to the mounter claw 23d of the window portion of the lens fixing plate 23 can be easily provided by attaching a claw corresponding to another member such as an anamorphic lens or a reversing mirror (both are not shown). There is an effect that detachment is possible with one touch. Therefore, there is an effect that other members can be mounted and used without impairing the function of the initial setting irrespective of the movement of the projection lens 20, and a groove or a thread portion is provided in the outer case when the other members are mounted. Since it is not necessary to fix, the exterior case is not scratched, and a design excellent in appearance can be provided. Further, a screw-type attachment / detachment method by installing a screw portion instead of the mounter claw 23d is also possible. Further, the leg 23a of the lens fixing plate 23
Since the shape of the projection lens 20 escapes part or all of the outer shape of the projection lens 20, there is also an effect that the incorporation of the projection lens 20, particularly the autofocus distance measuring unit 20a, is improved.

As shown in FIGS. 15 and 16, the infrared filter 22 has an L-shaped cross section, and is connected to the infrared emitting section 20 b and the infrared receiving section 20 c of the autofocus distance measuring section 20 a of the projection lens 20. The corresponding flat portion, the partition rib 22a for separating the infrared emitting portion 20b and the infrared receiving portion 20c, and the infrared filter 22 are inserted into the groove 1r with the infrared filter of the lower case 1.
Are formed by positioning projections 22b which engage with the projections. The infrared filter 22 is housed so that the positioning protrusion 22 b is engaged with the infrared filter groove 1 r of the lower case 1, and is sealed and fixed with screws via the lens fixing frame 24 and the lens fixing plate 23. . The infrared filter 22 is located in front of the autofocus distance measuring unit 20a of the projection lens 20, and covers the autofocus distance measuring unit 20a including the infrared emitting unit 20b and the infrared light receiving unit 20c. In such a structure, the lens fixing plate 2
Since the screw 3 is fixed to the lens via the lens fixing frame 24, the screw does not appear on the surface in appearance, so that the degree of freedom in design is improved, and the number of parts and the number of processing and assembling steps are reduced.
Further, the positioning protrusion 22b of the infrared filter 22 is engaged with the groove 1r into the infrared filter of the lower case 1 to be housed and completely sealed off from the outside.
By separating the infrared emitting section 20b and the infrared receiving section 20c of the autofocus distance measuring section 20a by 2a, interference between infrared rays of the infrared emitting section 20b and the infrared receiving section 20c and autofocusing due to external light and unnecessary light are performed. It also has the effect of preventing malfunction of the distance measuring unit 20a and protecting it from scratches and dirt due to disturbance.

As shown in FIG. 6, the foot adjuster 16
The bottom of the foot 17 has an R surface or a substantially spherical shape. In such a structure, when the height is adjusted or the LCD projector body is tilted, the bottom grounding part is in point contact,
In addition, since the main body installation surface is in point contact even with some unevenness, the problem that the operation is unstable and the position cannot be determined during operation can be solved.

As shown in FIG. 18, a circuit group serving as a heat source (for example, power supply circuit 15, power supply circuit shield plate 15a, etc.)
The ventilation holes 1i and 6c are provided in the base plate 6 and the lower case 1 located at the lower part of the base plate, and the ventilation holes 1i and 6c are shifted to an arbitrary position or completely or completely so that they do not completely coincide with each other when viewed two-dimensionally. They are staggered. In such a structure, it is possible to easily secure and improve the air permeability of the ventilation hole for cooling the heat source, and it is difficult to directly contact the heat source or the high voltage source from the outside, thereby preventing danger. There is. Similar effects can be obtained even if the shape of the ventilation holes is the same or different from 1i and 6c. Further, a dustproof filter 18 integrally formed with the lower case 1 on the front side of the lower case 1 is provided on the bottom of the liquid crystal projector main body. It is configured to slide. The dustproof filter 18 is a positioning protrusion 1 of the dustproof filter 18.
8a and positioning recess 19a of dust-proof filter fixing frame 19
The position can be fixed by the engagement of. In such a structure, the dustproof filter 18 can be easily attached and detached simply by sliding in the groove formed by the lower case 1 and the dustproof filter fixing frame 19, so that dust and dust can be easily removed. In addition to one-touch operation, positioning protrusion 1
8a and the engagement of the positioning recess 19a can easily provide a click-fitting attachment / detachment and fixation, so that it is not necessary to fix the deformed parts, and the processing can be simplified.
Similar effects can be obtained even if the positioning convex / concave portions are reversed in component configuration.

[0035]

As described above, the present invention has the following advantages. (1) Even if it is installed in any place by the method of using the liquid crystal projector, especially in a high place or a low place, the upper and lower slopes are provided on the interface frame. A slope is provided, and it can be easily confirmed only by moving the line of sight to look down or look up at the display described therein. Further, since the screws are not exposed to the exterior in appearance, there is no restriction on the degree of freedom in design and a neat design can be provided. In addition, the input / output terminal portion is provided with a large force for insertion / extraction at the time of mounting, but can easily cope with the strength and can provide a solid structure.

(2) The first step of the cooling fan cover (the most protruding portion on the entire circumference) has the lower part in the concave groove of the lower case 1 containing the cooling fan cover, and the first part of the convex shape has the side wall and the reinforcing rib of the lower case. , Are positioned and fixed with screws by screw fixing portions, and further, the cooling fan cover is sandwiched and fixed between the lower case and the upper case. For this reason, the screws are not exposed on the external surface, so there is no restriction on the degree of freedom in design, providing a neat design.In addition, the structure is robust and easy to cope with large external forces. Has the effect of providing

(3) The lens cover is formed in an R-plane shape and is arranged at a position where the movement of the projection lens is not hindered to cover and protect the projection lens. By setting the lens frame to the same curvature R as the R surface of the lens cover and holding the lens cover so that the lens cover can slide smoothly along the R shape, the trajectory of the lens cover can be compared with the conventional left and right opening and closing The projection trajectory of the upper and lower cases is downsized because of the rotation trajectory in the circumferential direction, and the shape is adapted to this trajectory, and the handling operation (opening / closing operation) is performed because the lens cover is inside the upper and lower cases. Even if it is frequent, there is an effect that scratches and dirt are hardly attached on the appearance.

(4) Since one or more mounting screw portions are provided at an arbitrary position on the outer bottom surface of the lower case at an arbitrary position, the screws can be easily fixed to other members, and the lower case can be mounted on the ceiling. Also, when installed on a wall, the problem of dropping, moving and misalignment of the liquid crystal projector body and eliminating scratches is solved.

(5) The window portion of the lens fixing plate is located outside the projection lens (on the light emitting side) and does not obstruct the path of the light beam emitted from the projection lens. By providing a claw corresponding to the mounter claw on the mounting portion of another member such as an anamorphic lens or a reversing mirror (both not shown), there is an effect that the attachment and detachment can be easily performed with one touch. Therefore, there is an effect that other members can be mounted and used without impairing the function of the initial setting regardless of the movement of the projection lens.When mounting other members, a groove is provided in the outer case or a screw portion is provided and fixed. This eliminates the necessity of doing so, so that the exterior case is not damaged, and a design excellent in appearance can be provided. Also, a screw-type attachment / detachment method by installing a screw portion instead of the mounter claw is possible. Further, since the leg portion of the lens fixing plate has a shape that escapes part or all of the outer shape of the projection lens, there is an effect that the incorporation of the projection lens, particularly, the autofocus distance measuring unit, is improved.

(6) The infrared filter has an L-shaped cross section, and a flat portion corresponding to the infrared emitting portion and the infrared receiving portion of the autofocus distance measuring portion of the projection lens, and the infrared emitting portion and the red portion. It is composed of a partition rib for separating the outer light-receiving part, a positioning protrusion for engaging the infrared filter with the groove for the infrared filter of the lower case, and the positioning protrusion for engaging the groove for the infrared filter of the lower case. It is housed, sealed and fixed with screws via the lens fixing frame and the lens fixing plate, and further located at the front of the autofocus distance measuring unit of the projection lens and including an infrared emitting unit and an infrared light receiving unit. The screws are fixed from the inside of the lower case via the lens fixing plate and lens fixing frame, so that the screws do not come out on the surface and the design flexibility is improved, the number of parts and processing assembly Man-hours There is an effect that is Gensa. Further, the positioning protrusion of the infrared filter is engaged with the groove for the infrared filter of the lower case to be housed, so that a sealed state is completely separated from the outside, and the infrared emission part of the autofocus distance measuring part is provided by the partition rib. Separates the infrared receiver and the infrared receiver to prevent interference between the infrared emitter and the infrared receiver, malfunction of the autofocus distance measuring unit due to external light and unnecessary light, and protects from scratches and dirt due to disturbance. It has an effect.

(7) Since the bottom of the foot adjuster and the foot has a round surface or a substantially spherical shape, when the height is adjusted or the liquid crystal projector main body is tilted, the bottom grounding portion comes into point contact, and Since the mounting surface makes a point contact even with some unevenness, it is possible to solve the problem that the operation is unstable during operation and the position is not determined.

(8) Ventilation holes are provided in a base plate and a lower case located below a circuit group (for example, a power supply circuit / power supply circuit shield plate) serving as a heat source. Because it is placed at an arbitrary position so that it does not completely match,
This has the effect of easily realizing and improving the air permeability of the ventilation hole for cooling the heat source, and making it difficult to directly contact the heat source or the high voltage source from the outside, thereby preventing danger. Similar effects can be obtained even if the shape of the ventilation holes is the same or different. In addition, a dustproof filter that is integrated with the lower case is provided on the bottom of the LCD projector body on the front side of the lower case, and the dustproof filter slides in the groove formed by the lower case and the dustproof filter fixing frame. The dust filter has a structure that can be positioned and fixed by the engagement between the positioning protrusion of the dust filter and the positioning recess of the dust filter fixing frame. In such a structure, the dustproof filter can be easily attached and detached simply by sliding in the groove formed by the lower case and the dustproof filter fixing frame, so that dust and dust can be easily removed with one touch. In addition, the engagement of the positioning projections and the positioning recesses makes it easy to provide detachable fixing with a click feeling, so that it is not necessary to fix the parts by deforming them, and the processing can be simplified. Similar effects can be obtained even if the positioning convex / concave portions are reversed in component configuration.

Therefore, according to the present invention, by obtaining the above-described effects, the number of parts, the number of processing steps, and the number of assembling steps are small, and the function, use, and handling of a small-sized liquid crystal projector which is inexpensive and has excellent design aesthetics. We also provide excellent quality products.

[Brief description of the drawings]

FIG. 1 is a plan view showing the internal structure of a liquid crystal projector according to an embodiment of the present invention.

FIG. 2 shows an optical unit 10 and a drive circuit 1 from FIG.
The internal structure figure seen from the plane except for 4.

FIG. 3 is a plan view showing the appearance of a liquid crystal projector showing one embodiment of the present invention.

FIG. 4 is a front view of the appearance of a liquid crystal projector showing one embodiment of the present invention.

FIG. 5 is a rear view of the appearance of the liquid crystal projector showing one embodiment of the present invention.

FIG. 6 is a side view of the appearance of a liquid crystal projector showing one embodiment of the present invention.

FIG. 7 is a bottom view of the appearance of the liquid crystal projector showing one embodiment of the present invention.

FIG. 8 is an enlarged plan view around an interface frame of the liquid crystal projector showing one embodiment of the present invention.

FIG. 9 is an enlarged cross-sectional view around an interface frame of the liquid crystal projector showing one embodiment of the present invention.

FIG. 10 is another enlarged cross-sectional view around the interface frame of the liquid crystal projector showing one embodiment of the present invention.

FIG. 11 is an enlarged plan view around a cooling fan cover of the liquid crystal projector showing one embodiment of the present invention.

FIG. 12 is an enlarged sectional view around a cooling fan cover of the liquid crystal projector showing one embodiment of the present invention.

FIG. 13 is a front view showing the shape of a lens fixing plate of the liquid crystal projector showing one embodiment of the present invention.

FIG. 14 is a plan view showing a shape of a lens fixing plate of the liquid crystal projector according to one embodiment of the present invention.

FIG. 15A is a plan view illustrating a shape of an infrared filter of a liquid crystal projector according to an embodiment of the present invention.
(B) is a front view which shows the shape of the infrared filter of the liquid crystal projector which shows one Example of this invention. FIG.
Sectional drawing which shows the *-* part of 5 (a) (b).

FIG. 16 is an enlarged cross-sectional view around a projection lens unit of a liquid crystal projector showing one embodiment of the present invention.

FIG. 17 is an enlarged plan view of a lower case 1 around a projection lens unit of a liquid crystal projector showing one embodiment of the present invention.

FIG. 18 is an enlarged cross-sectional view of the vicinity of a dust-proof filter portion of a liquid crystal projector showing one embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 Lower case 1a, 1b, 2a Case screw fixing part 1c Mount screw part 1d, 2b Projection lens part protruding part 1e, 1f, 1g, 1h Notch part 1i Intake hole 1j Handle part 1k Interface frame concave groove 11L Interface frame engagement Convex portion 1m Groove with cooling fan cover 1n Reinforcing rib 1p Groove with lens cover 1q Lower case side wall 1r Groove with infrared filter 2 Upper case 2d Lens cover guide 3 Interface frame 3a Boss 3b Side end 3c Fixing recess 3d Upper slope 3e Lower slope 4 Cooling fan cover 4a Convex first stage side end 4b Convex first stage bottom 4c Screw fixing part 5 Side cover 6 Base plate 6a Reinforcement rib 6b Bend 6c Vent hole 7 White light source and reflector 8 Lamp housing 9 Ballast 9a Shield plate 10 Optical unit 10a, 10b, 10c Liquid crystal light valve 10d Box light guide 11 Cooling fan 11a, 13a, 14a Fixture 12 Interface circuit 12a Video input terminal 12b Analog RGB terminal 12c Shield plate 12L, 12R Audio input terminal 12S S input terminal 13 Video circuit 14 Drive circuit 15 Power supply circuit 15a Power supply circuit shield plate 16 Foot adjuster 17 Foot 18 Dustproof filter 18a Positioning convex portion 18b Net portion 19 Dustproof filter fixing frame 19a Positioning concave portion 20 Projection lens 20a Autofocus distance measuring portion 20b Infrared emitting portion 20c Infrared light receiving section 21 Lens cover 21a Lens cover protrusion 22 Infrared filter 22a Partition rib 22b Positioning projection 23 Lens fixing plate 23a Leg 23b Reinforcing part 23c Projection lens escape part 23d Mounter claw 24 Lens frame

[Procedure amendment]

[Submission date] April 1, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Name of invention

[Correction method] Change

[Correction contents]

[Title of the Invention] Projector

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction contents]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projector that forms an image with a light valve and projects the image with a projection lens.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

[0013]

A projector according to the present invention forms an image with a light valve and projects the image with a projection lens. The projector includes an outer case and a member housed in the outer case. A machine frame to be mounted, the machine frame is disposed so as to overlap the lower surface of the outer case, and a position where the outer case overlaps with the machine frame and the machine frame are provided with ventilation holes, respectively. The ventilation hole provided in the outer case and the ventilation hole provided in the machine frame are provided so as not to completely overlap.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

According to another aspect of the invention, there is provided a projector for forming an image with a light valve and projecting the image with a projection lens, comprising: an outer case; and a dustproof filter slidable along a surface of the outer case. And the following.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

In the above projector, the dustproof filter is configured to slide in a groove formed by a surface of the outer case and a dustproof filter fixing frame, and a part of the dustproof filter is provided. A recess is provided,
The dustproof filter fixing frame is characterized in that a convex portion is provided at a position corresponding to the concave portion provided on the dustproof filter.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction contents]

In the above projector, the dustproof filter is configured to slide in a groove formed by a surface of the outer case and a dustproof filter fixing frame, and a part of the dustproof filter is provided. A projection is provided,
The dustproof filter fixing frame is characterized in that a recess is provided at a position corresponding to the recess provided in the dustproof filter.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Deleted

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Deleted

[Procedure amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Deleted

[Procedure amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Deleted

[Procedure amendment 12]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Deleted

[Procedure amendment 13]

[Document name to be amended] Statement

[Correction target item name] 0022

[Correction method] Deleted

[Procedure amendment 14]

[Document name to be amended] Statement

[Correction target item name] 0023

[Correction method] Deleted

[Procedure amendment 15]

[Document name to be amended] Statement

[Correction target item name] 0035

[Correction method] Change

[Correction contents]

[0035]

As described above, according to the present invention, a machine frame for mounting a member accommodated in an outer case and a ventilation hole are provided at positions of the outer case overlapping the machine frame, respectively.
Since the ventilation holes are arranged so as not to coincide with each other when viewed two-dimensionally, it is possible to easily realize and improve the ventilation of the ventilation holes for cooling the heat source, and also to externally generate the heat source and the high voltage. There is an effect that it becomes difficult to directly touch the source and danger prevention can be measured. Similar effects can be obtained even if the shape of the ventilation holes is the same or different. Further, by providing a dustproof filter slidable along the surface of the outer case, the dustproof filter can be easily attached and detached, so that dust and dust can be easily removed with one touch. Further, the dustproof filter is configured to slide in a groove formed by the surface of the outer case and the dustproof filter fixing frame, and a part of the dustproof filter has a concave portion, and the dustproof filter fixing frame has a dustproof filter. By providing a convex portion at a position corresponding to the concave portion provided in the, the concave portion provided in the dustproof filter, by engagement with the convex portion provided in the dustproof filter fixing frame,
Since attachment and detachment fixing with a click feeling can be easily provided, it is not necessary to fix the deformed parts by deforming the parts, and the processing can be simplified. Further, the same effect can be obtained by providing the projections on the dustproof filter and the projections on the dustproof filter fixing frame.

[Procedure amendment 16]

[Document name to be amended] Statement

[Correction target item name] 0036

[Correction method] Deleted

[Procedure amendment 17]

[Document name to be amended] Statement

[Correction target item name] 0037

[Correction method] Deleted

[Procedure amendment 18]

[Document name to be amended] Statement

[Correction target item name] 0038

[Correction method] Deleted

[Procedure amendment 19]

[Document name to be amended] Statement

[Correction target item name] 0039

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[Procedure amendment 20]

[Document name to be amended] Statement

[Correction target item name] 0040

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[Procedure amendment 21]

[Document name to be amended] Statement

[Correction target item name] 0041

[Correction method] Deleted

[Procedure amendment 22]

[Document name to be amended] Statement

[Correction target item name] 0042

[Correction method] Deleted

[Procedure amendment 23]

[Document name to be amended] Statement

[Correction target item name] 0043

[Correction method] Change

[Correction contents]

According to the present invention, by obtaining the above-described effects, the number of parts, the number of processing steps, and the number of assembling steps are small, and the projector is inexpensive, has a good design and is beautifully designed, and has excellent functions and handling. It provides products of excellent quality.

Claims (11)

[Claims] 1. A white light source, a reflector, a light source driving power supply circuit for driving the white light source, a lamp housing having a window for holding the reflector and emitting a light beam, covering the others, shielding and reinforcing light, and image forming. Liquid crystal light valve, dichroic mirror for light separation / synthesis, optical filter, prepolarizer, condenser lens, optical unit with built-in light guide and projection lens, cooling fan for cooling the heating element, image input from outside An interface circuit for taking in an audio signal, a video circuit for converting an analog video signal into a digital signal and controlling it, a drive circuit for driving and controlling the liquid crystal light valve for image formation by a signal from the video circuit, and driving of each circuit group A power supply circuit for supplying energy, a machine frame for holding and mounting each circuit group and each member, A lower case for storing and mounting the machine frame mounted with each circuit group and each member, an upper case for covering and sealing the lower case, a side cover, a cooling fan cover, an interface frame, an operation panel, a lens cover, and an infrared ray In a liquid crystal projector composed of filters, etc.,
The liquid crystal projector, wherein the interface frame includes an input / output terminal mounting surface and at least one type of surface having a different angle from the input / output terminal mounting surface. 2. The liquid crystal projector according to claim 1, wherein the interface frame has a surface orthogonal to an input / output terminal mounting surface disposed on a base substrate, and a concave groove provided in the lower case. The end of the interface frame is engaged, the concave portion of the surface orthogonal to the input / output terminal mounting surface of the interface frame is engaged with the convex portion of the lower case, and a screw fixing portion is provided at the engaging portion. 2. The liquid crystal projector according to claim 1, wherein the interface frame is disposed so as to sandwich the interface frame between the upper case and the lower case. 3. The liquid crystal projector according to claim 1, wherein the cooling fan cover has a two-stage convex shape around the entire circumference, and the first stage of the convex shape (the most protruding portion around the entire circumference). The lower part of the lower case is engaged with the concave groove of the lower case, the side part is disposed so as to be sandwiched between the lower case side wall and the rib, a screw fixing part is provided in the interlocking part, and the lower case and the upper case are A liquid crystal projector characterized by being arranged so as to sandwich a cooling fan cover. 4. The liquid crystal projector according to claim 1, wherein the lens cover that covers and protects the projection lens has an R surface, and the upper and lower cases each have the R surface. A liquid crystal projector comprising: a concave groove having the same curvature; and the concave groove is set so that the lens cover slides. 5. The liquid crystal projector according to claim 1, further comprising a mount screw portion provided on a bottom surface (outside) of the lower case so as to be connectable to another member. 6. A mounter fixing member according to claim 1, wherein a window is provided outside the projection lens (a light exit side) so as not to obstruct a path of a light beam emitted from the projection lens. The mounter fixing member has a window portion provided with at least one or more mounter claws or a screw portion on which the other member can be easily mounted. Is a liquid crystal projector provided with a screw portion. 7. A liquid crystal projector according to claim 1, wherein a mounter fixing member having a square Z shape is provided on a side wall of a machine frame for holding and mounting each of said circuit groups and members. 7. The liquid crystal projector according to claim 6, wherein the mounter fixing member includes a leg portion that escapes part or all of the outer shape of the projection lens, and a window portion that does not hinder the path of a light beam emitted from the projection lens. 8. The liquid crystal projector according to claim 1, wherein the infrared filter for protecting an auto-focus distance measuring unit provided in the projection lens has an L-shaped cross section. , Housed in a concave groove provided in the lower case, and sealed and fixed by a lens frame,
Further, the infrared filter has a partition rib for separating an infrared emitting light portion and a light receiving portion of an autofocus distance measuring portion of the projection lens. 9. A liquid crystal projector comprising the preamble of claim 1 and having a pair of movable foot adjusters at one of the front and rear sides of the liquid crystal projector body and a pair of fixed foots at the other front or rear side. In the liquid crystal projector, the foot adjuster and the bottom of the foot are formed in an R surface or a substantially spherical shape. 10. A liquid crystal projector comprising the above-mentioned preamble of claim 1, wherein each of said circuit groups and other members existing under a circuit group as a heat source is held and mounted. A liquid crystal projector characterized in that a ventilation hole is provided in a case and each ventilation hole is arbitrarily shifted or completely shifted so as not to completely coincide. 11. A liquid crystal projector, wherein the cooling fan is disposed on a bottom surface of a main body of the liquid crystal projector, wherein the cooling fan has an integral view with a front side of the lower case. A dustproof filter is provided at the bottom of the liquid crystal projector main body, and the dustproof filter is configured to slide in a groove formed by the lower case and the dustproof filter fixing frame. A liquid crystal projector, wherein one of the projections and depressions is provided at a position corresponding to one of the projections and depressions on the dust-proof filter fixing frame.