JP3269486B2 - projector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[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.

[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]

A liquid crystal projector of the present invention According to an aspect of the image formed by the light valve, and the projector which projects the image by the projection lens, auto for performing autofocus of the <br/> projection lens A focus distance measuring unit,
An exterior case and a light fixing side for fixing another lens on the light emitting side of the projection lens, wherein the autofocus distance measuring unit includes an infrared light emitting unit, an infrared light receiving unit, An infrared filter that covers the infrared light emitting unit and the infrared light receiving unit, and the autofocus distance measuring unit includes:
The infrared filter is disposed below the projection lens, is housed in a concave groove provided in the outer case, is fixed to the lens fixing frame, and has an infrared filter.
The focusing distance measuring unit is configured to control the optical axis of the projection lens and the
Make sure that the center axis of the focus
Through the lens fixing frame, the projection lens
And is fixed so as to be integrated therewith.

Further, the liquid crystal projector of the present invention, the image formed by the light valve has a projector which projects the image by the projection lens, and a autofocus measuring distance unit for performing autofocus of the projection lens In the projector, the autofocus distance measuring unit includes an infrared light emitting unit, an infrared light receiving unit, and an infrared filter that covers the infrared light emitting unit and the infrared light receiving unit. , The auto focus distance measuring unit,
Density completely separated from the outside by the infrared filter
The infrared filter is configured to be in a sealed state, and the infrared filter has a partition rib for separating the infrared light emitting unit and the infrared light receiving unit.

[0015]

[0016]

[0017]

[0018]

[0019]

[0020]

[0021]

[0022]

[0023]

[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 the name and the purpose display of each input / output terminal are displayed on the upper slope 3d and the lower slope 3e, there is an effect that the user can confirm even if the user does not look at the place. Further, the interface frame 3 and the interface circuit 12 are provided with the notch 1
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 on 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 at the bottom of the main body of the liquid crystal projector, and the dustproof filter 18 is provided in a groove formed by the lower case 1 and the dustproof filter fixing frame 19. 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 concave portion 19a can easily provide a detachable fixing with a click feeling, so that it is not necessary to fix the parts by deforming the 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]

According to the present invention, as described above, the infrared filter is housed in the concave groove provided in the outer case,
By being fixed to the lens fixing frame, there is an effect that the degree of design freedom is improved without screws appearing on the surface in appearance, and the number of parts and the number of processing and assembling steps are reduced. Also,
The autofocus distance measuring unit can be protected from scratches and dirt caused by disturbances by engaging the infrared filter in the concave groove of the case and storing the infrared filter in a sealed state completely separated from the outside. Further, since the infrared filter has a partition rib for separating the infrared light emitting portion and the infrared light receiving portion, interference between the infrared emitting portion and the infrared light receiving portion due to infrared rays, external light, and unnecessary light can be prevented. Malfunction of the autofocus distance measuring unit can be prevented.

[0036]

[0037]

[0038]

[0039]

[0040]

[0041]

[0042]

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.

[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

Claims (2)

(57) [Claims] 1. An external case, comprising: a projector that forms an image with a light valve and projects the image with a projection lens; and an autofocus distance measurement unit that performs autofocus of the projection lens. And, on the light emitting side of the projection lens, has a lens fixing frame for fixing another lens, The autofocus distance measuring unit, an infrared light emitting unit, an infrared light receiving unit, An infrared filter that covers an infrared light emitting unit and an infrared light receiving unit, wherein the autofocus distance measuring unit is located below the projection lens.
The infrared filter is housed in a concave groove provided in the outer case, is fixed to the lens fixing frame, and the autofocus distance measuring unit is configured to control the light of the projection lens.
Axis and the central axis of the autofocus distance measuring unit are the same
Through the lens fixing frame, so as to be on a straight plane,
A projector, wherein the projector is fixed so as to be integrated with the projection lens . 2. A projector comprising: a projector that forms an image by a light valve and projects the image by a projection lens; and an autofocus distance measuring unit that performs autofocus of the projection lens. The focus distance measuring unit includes an infrared light emitting unit, an infrared light receiving unit, and an infrared filter that covers the infrared light emitting unit and the infrared light receiving unit, and the auto focus distance measuring unit Is the infrared filter
Configuration that is completely sealed from the outside by
The projector, wherein the infrared filter includes a partition rib for separating the infrared light emitting unit and the infrared light receiving unit.