JP2003107583A - Projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection type display device which has an attachment/ detachment part 2 tightly fixed in the front 11 of a housing and the housing front 11 reinforced by the circumference of an opening 12 and facilitates replacement with a wide-angle lens unit. SOLUTION: The projection type display device, equipped with the housing 1 comprising the attachment/detachment part 2 and a main-body part 3 constituting the whole housing 1 with the loaded attachment/detachment part 2 and also having a circular opening 12, where a projection lens unit 8 is exposed or inserted, formed in the housing front 11 as arcuate cuts 23 and 33 provided to the attachment/detachment part 2 and main body part 3 connect with each other, is equipped with a nearly annular fixed ring member 5 which is mounted in the housing front 11 along the opening edge 13; and a hollow part 4 where the fixed ring member 5 is fitted and inserted is formed in an area of fixed width from the opening edge 13 in an opening radius direction in the housing front 11 and at the fixed ring member 5 and hollow part 4, coupling means are formed which couple the fixed ring member 5, attachment/detachment part 2, and main-body part 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection display device such as a liquid crystal projector. In particular, the present invention relates to a projection display device in which a part of a housing is detachably attached for replacement of a projection lens.

[0002]

2. Description of the Related Art A projection display device such as a liquid crystal projector collects and reflects light emitted from a light source such as a metal halide lamp, and reflects this light into R (red), G (green) and B.
The light is separated into (blue), and the light is subjected to intensity or phase modulation by a light valve, and the modulated light, that is, image information obtained from the light valve is projected on a screen through a projection lens.

The distance between the projection display device and the screen is often limited by the circumstances in which the projection display device is used, such as the layout of a venue where a presentation is made. Therefore, in order to project a clear image on the screen in response to changes in the distance from the screen,
There is known a projection display device in which a projection lens unit can be replaced. By using such a projection display device, the user can select a projection lens unit having an appropriate focal length such as a long focus lens unit or a short focus lens unit, and the existing projection lens unit can be zoomed. It is also possible to change to a special projection lens unit having functions and the like.

FIG. 12 shows an exploded perspective view of a conventional projection display device. The housing (1) for accommodating the components such as the projection lens unit (8), the metal halide lamp, and the ride bulb is a molded product such as ABS resin, and the main housing (16) and the projection lens unit (8) side The front housing (17) is located at the front of the front housing (17), and the front housing (17) has a circular opening (12) through which the projection lens unit (8) is inserted. The projection lens unit (8)
The lens (81) is exposed at the front end and is connected to the projection lens unit holding means (not shown) arranged in the housing (1) at the rear end. It has the necessary mechanism for.

In order to replace the projection lens unit (8), the front housing (17) near the projection lens unit (8)
A part of it is removable. By separating the front and top parts of the front housing (17) from the front and the upper part, the space (10) necessary for exchanging the projection lens unit (8) is provided as a detachable part (2). It can be opened upward of (17). Projection lens unit for replacement
The opening (12) also needs to be separated to allow the (8) to move upwards. Therefore, the upper half of the opening (12) is
It is a semicircular cutout (23) provided in (2) and the opening (1
The lower half of 2) is a semi-circular cutout (33) provided in the fixed part (18) to which the detachable part (2) is attached, and the detachable part (2) is attached to the fixed part (18). Two notches by doing (23)
The (33) forms an opening (12) on the front surface (11) of the housing. In FIG. 12, the detachable part (2) attached to the fixed part (18) is shown by a dashed line.

In order to detachably attach the detachable portion (2) to the fixed portion (18), a claw piece (25) is attached to the lower end of the detachable portion front surface portion (22).
Projecting pieces (36) are respectively provided from the front edge of the fixing portion (18). When attaching the detachable part (2) to the fixed part (18), the claw piece (25) fits into the recess (35) provided on the back of the front surface of the fixed part (18), and the detachable part (2) Projecting piece (36) in the recess (26) provided on the back side
Come into contact with each other, and the front surface portion (22) of the detachable portion is joined to the front surface portion of the fixed portion (18). Further, the detachable portion (2) is attached to the fixed portion (18) by connecting the detachable portion upper surface portion (21) and the fixed portion (18) upper surface portion with screws.

[0007]

However, the conventional projection type display device as described above has the following problems. When attaching or detaching the detachable part (2),
Projection lens unit (8) to support (2)
In order to be able to finely adjust the position of the
It is formed to be larger than the cross-sectional diameter of the projection lens unit (8). That is, between the outer peripheral surface of the projection lens unit (8) and the opening peripheral edge (13), there is formed a gap into which a human finger can easily enter. Usually, this gap is the only place on the front surface of the projection projection device where a finger can be put, so an inadvertent user may hang his / her finger on the opening edge (13) during transportation or the like. In this case, the user, for example, puts his thumb on the detachable part.
(2) It is brought into contact with the front surface, and other fingers are hung on the opening peripheral edge (13) to support the detachable portion (2), and force is applied to the detachable portion (2). Therefore, as described above, only the claw piece (25) and the projecting piece (36) are used to attach and detach
When (2) and the fixing part (18) are fixed, if the magnitude of the force applied to the detaching part (2) is inappropriate, the claw piece (25) or the projecting piece (36)
May be damaged, and in severe cases, the front surface (22) of the detachable part may be damaged.

In order to firmly fix the detachable portion (2) and the fixed portion (18), for example, in the front surface (11) of the housing, the detachable portion
It is possible to fix the (2) and the fixing part (18) with a screw. However, in order to facilitate the replacement work of the projection lens unit (8), it is desirable to avoid the use of screws as much as possible. Further, it is not preferable to expose the screws on the front surface (11) of the housing in terms of design. In addition, if the user's behavior as described above is taken into consideration, it is necessary to reinforce the front surface (11) of the housing around the opening (12).

Further, in the conventional projection type display device, when the projection lens unit (8) is changed from the normal type to the wide-angle lens unit, it is necessary to replace the front case (17). The front of the wide-angle lens unit
The reason is that the wide-angle lens unit cannot be inserted into the opening (12) because it is tapered toward the tip and has a diameter larger than the opening diameter. Note that if the aperture diameter is increased to match the wide-angle lens unit, an excessively large gap will be created when a normal type projection lens unit (8) is installed, and foreign matter may easily enter the projection display device. It is not desirable because it occurs. Therefore, in the conventional projection display device, when the wide-angle lens unit is used, the user replaces the existing front casing (17) with the separately supplied front casing for the wide-angle lens unit. . However, replacement of the front housing (17) is a very complicated work, and further, it is necessary to store the unused front housing detached from the main housing (16). Therefore, it is necessary to reduce such a burden on the user when replacing the wide-angle lens unit.

According to the present invention, the above problem is solved, the detachable portion (2) is firmly fixed on the front surface (11) of the housing, and the front surface (11) of the housing is reinforced around the opening (12). Provided is a projection display device that can be easily replaced with a wide-angle lens unit.

[0011]

A projection display device of the present invention comprises a housing (1) for accommodating constituent devices such as a projection lens unit (8) and a light valve, and the housing (1) is A part (21) of the upper surface of the housing located above the projection lens unit (8),
A detachable portion (2) having a portion (21) of the upper surface of the housing and a portion (22) of the front surface of the housing, and a main body portion (3) to which the removable portion (2) is detachably mounted. It is composed of the detachable part (2) and the main body part (3)
By connecting the arcuate notches (23) and (33) provided in each of the
In a projection display device having a circular opening (12) through which (8) is inserted, a substantially ring-shaped fixing ring member (removably mounted on the front surface (11) of the housing and surrounding the opening (12) ( 5), the housing front surface (11), in a region at a constant distance from the opening peripheral edge (13), a recessed portion (4) into which the fixed ring member (5) is fitted is formed,
The fixing ring member (5) and the recess (4) have the fixing ring member
It is characterized in that a connecting means for connecting the (5) to the detachable section (2) and the main body section (3) is formed.

Further, in the projection display device of the present invention, in addition to the above structure, the fixing ring member (5) has a substantially cylindrical inner wall portion (51) and a diameter larger than the inner wall portion (51) diameter. The substantially cylindrical outer wall portion (52) and the inner wall portion at the front end of the fixed ring member (5)
(51) and the front wall portion (53) connected to the outer wall portion (52), and the space between the inner wall portion (51) and the outer wall portion (52) is open at the rear end of the fixed ring member (5). The connecting means is a fixed ring member utilizing the elastic deformation of the outer wall portion (52).
The (5) is connected to the detachable section (2) and the main body section (3).

Further, in addition to the above-mentioned structure, the projection display device of the present invention has a predetermined ring around the central axis Y of the fixed ring member (5) on the outer wall portion (52) of the fixed ring member (5). A recess (58) that opens at the rear end of the fixed ring member (5) is formed at intervals of, and the coupling means includes a lock rib mechanism (6) provided in the recess (58) and an opening (12). The lock rib mechanism (6) includes a lock groove mechanism (7) provided in the recess (4) around the central axis X at a predetermined interval, and the lock rib mechanism (6) rotates in the rotational direction Q around the central axis Y.
Along with the guide rib (62) projecting from at least one of the recess wall surface (58a) and the recess bottom surface (58b), and along the central axis Y direction of the fixed ring member (5), the guide rib front surface (62).
b) and a lock rib (63) protrudingly provided on at least one of the bottom surface (58b) of the recess.

Further, in addition to the above-mentioned structure, the projection display device of the present invention has a fixing ring member (5) on the bottom surface (42) of the recess between the guide groove (72) and the opening peripheral edge (13). ) Outer wall (52)
A mounting guide rib (43) for limiting the deformation of the projection is provided.

[0015]

[Operation and effect] In the projection display device of the present invention, since the substantially annular fixing ring member (5) is mounted around the opening (12), the user is not aware of the peripheral edge of the opening of the attaching / detaching part (2). Put the finger on the inner peripheral surface (54) of the fixing ring member (5) without putting the finger on the (13). Further, even when the finger reaches the opening peripheral edge (13), most of the force applied by the user is applied to the fixing ring member (5). The fixed ring member (5) is fitted in the recess (4) formed on the front surface (11) of the housing, and further, the fixed ring member (5).
Since a coupling means for coupling with the detachable part (2) and the main body part (3) is formed in this, even if a force is applied to the fixed ring member (5), it is stably supported by the recess part (4). Exists. In this way, the housing (1) can be reinforced around the opening (1). In addition to this, since the fixing ring member (5) is formed with a connecting means for connecting to the detaching part (2) and the main body part (3), the detaching part is formed via the fixing ring member (5).
Since the (2) and the main body part (3) are coupled, the detachable part (2) can be firmly fixed to the main body part (3) on the front surface (11) of the housing.

Further, in the projection display device of the present invention, if the fixing ring member (5) is removed, the wide-angle lens unit (8a)
Can be attached to the projection display device. Recess (4)
Is provided around the opening (12), so that no interference occurs between the front part of the wide-angle lens unit (8a) and the front surface of the housing (11). Therefore, the wide-angle lens unit (8a) can be replaced more easily than the conventional device.

Further, in the projection display device of the present invention, the fixing ring member (5) has a substantially cylindrical inner wall portion (51) and a substantially cylindrical or substantially conical shape having a diameter larger than the inner wall portion (51). Outer wall of (5
2) and the inner wall portion (51) at the front end of the fixing ring member (5)
And a front wall portion (53) connected to the outer wall portion (52),
The space between the inner wall portion (51) and the outer wall portion (52) is a fixed ring member.
(5) Since it is open at the rear end, it is possible to connect the fixing ring member (5) with the detachable part (2) and the main body part (3) by utilizing the elastic deformation of the outer wall part (52). it can. Then, by utilizing the elastic deformation of the outer wall portion (52), the user merely applies an appropriate force to the fixing ring member (5) to move the fixing ring member (5) to the front surface (11) of the housing. It can be bound or unbound.

Further, in the projection display device of the present invention, a recess (58) which opens at the rear end of the fixed ring member (5) is formed, and the coupling means is a lock rib mechanism (provided in the recess (58). 6) and a lock groove mechanism (7) provided in the recess (4). The lock rib mechanism (6) includes a guide rib (62) along the rotation direction Q around the central axis Y and a fixing ring. Material (5)
The lock groove mechanism (7) includes a lock rib (63) along the central axis Y direction of the guide groove (7).
2) and the lock groove (74) into which the lock rib (63) fits, so when the fixing ring member (5) is fitted into the recess (4),
By fitting the lock groove mechanism (7) into the opening of the recess (58), the fixing ring member (5) can be easily positioned. After that, the fixed ring member (5) can be easily coupled to the front surface (11) of the housing only by rotating the fixed ring member (5), and the reverse rotation can easily release the coupling.

In addition to this, the lock groove mechanism (7) includes a mounting guide rib (43) for limiting the deformation of the outer wall portion (52) of the fixed ring member (5), so that a force is exerted on the outer wall portion (52). Even if added, the lock rib mechanism (6) and the lock groove mechanism (7) can be kept connected.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION An example of the present invention will be described in detail below with reference to the drawings. Regarding the same components as the conventional device,
The same code is used. FIG. 1 is a perspective view of a projection display device according to the present invention. The projection display device includes a substantially rectangular parallelepiped housing (1) that houses components such as a light valve, a prism, and a lamp, and the projection lens unit (8) also includes the housing (1).
Placed inside. The housing (1) is made of, for example, A with excellent toughness.
It is made by molding a resin such as BS resin.
The projection lens unit (8) is
A circular opening (12) through which is inserted is provided. The projection lens unit (8) has a substantially columnar shape and is arranged substantially perpendicular to the front surface (11) of the housing via a mounting base (not shown) in the housing (1). It The diameter of the opening (12) is larger than the diameter of the projection lens unit, and there is a space between the peripheral edge (13) of the opening and the outer peripheral surface of the projection lens unit (8) such that a human finger can easily enter.

The casing (1) is composed of a detachable portion (2) and a main body portion (3). The attaching / detaching part (2) includes a part (22) of the upper surface of the housing located above the projection lens unit (8) (hereinafter referred to as the upper surface of the attaching / detaching part), and a front surface of the housing connected to the upper surface of the attaching / detaching part (2). It has a part (21) of 11) (hereinafter referred to as the front surface of the detachable portion), and is detachably attached to the main body portion (3). The body part (3) is a detachable part
By mounting the (2), the entire housing (1) is formed. In addition, in order to perform maintenance inside the projection display device,
The body part (3) can be divided into a plurality of parts.

Around the opening (12), a substantially ring-shaped fixed ring member (5) having an inner diameter equal to the opening diameter.
Is detachably attached to the front surface (11) of the housing. The fixing ring member (5) is located on the front surface (11) of the housing when the detachable portion (2) is arranged at a predetermined position with respect to the main body portion (3), and the detachable portion (2) is attached by a coupling means described later. And the main body (3), respectively. That is, on the front surface (11) of the housing, the attaching / detaching part (2) is fixed to the main body part (3) via the fixing ring member (5).

When the fixing ring member (5) is mounted, a part of the fixing ring member (5) projects from the front surface (11) of the housing. Therefore, when the projection lens unit (8) projects through the opening (12) near the tip thereof to the outside of the housing (1), the fixing ring member (5) can surround the circumference of the tip,
The projection lens unit (8) is protected. Also,
Since the fixed ring member (5) has an inner peripheral diameter approximately equal to the diameter of the opening (12), the inner peripheral surface of the fixed ring member (5)
There is a space between the (54) and the outer peripheral surface of the projection lens unit (8) such that a human finger can easily enter it.

The detachable portion (2) and the fixing ring member (5) will be further described with reference to FIGS. 2 to 4 are exploded views in the vicinity of the front surface (11) of the housing showing a state in which the detachable part (2) and the fixing ring member (5) are separated.
Is a front view, FIG. 3 is a top view, and FIG. 4 is a side view. Desorption part
(2) is mainly composed of a substantially rectangular upper surface (21) of the detachable portion and a front surface (22) of the detachable portion which extends substantially at right angles from the end of the upper surface (21) of the detachable portion. Screw holes (91) are provided in the upper surface (21) of the detachable portion at both corners of the end portion away from the front surface (22) of the detachable portion. When attaching the detachable part (2) to the main body (3), the screw hole (91) faces the screw hole (92) provided in the main body (3), and these screw holes (91) A screw is screwed onto the (92) so that the upper surface (21) of the detachable portion is joined to the main body (3).

From the lower edge of the front surface (22) of the detachable part, the claw piece (25)
Is protruding. When the attachment / detachment part (2) is attached, the claw piece (25) fits into the recess (35) provided on the back surface of the main body part (3). Further, a projecting piece (36) projects from the edge of the main body part (3) that abuts the lower edge part of the detachable part front face part (22), and the projecting piece (36) is attached when the detachable part (2) is mounted. Is a recess (2
Fit in 6). By these, the detachable part (2) can be arranged at a predetermined mounting position with respect to the main body part (3), and the main body part (3)
Since the displacement of the detachable part (2) with respect to is suppressed, the fixing ring member (5) can be easily attached.

An arcuate notch is formed on the front surface (22) of the detachable section.
(23) is provided, and the notch (2
An arcuate notch (33) is provided in the opposite direction to 3).
These notches (23) and (33) are connected to each other, and a circular opening (12) is opened in the front surface (11) of the housing when the attachment / detachment part (2) is attached. FIG. 5 shows a state in which the detachable part (2) is attached to the main body part (3).
In the present embodiment, these notches (23) and (33) are both provided in a semicircular shape, but it is not necessary to do so. However, in order to facilitate replacement of the projection lens unit (8), it is preferable that the notch (23) of the attachment / detachment part (2) be substantially semicircular.

As shown in FIG. 5, in the front surface (11) of the housing, a region having a certain distance outward from the opening peripheral edge (13) is recessed inside the housing (1) with respect to the peripheral surface. There is. That is, the opening (1
2) A central side of the hollow portion (41) that shares the central axis X with the opening (12) at regular intervals, and an annular side surface (41) extending from the opening peripheral edge (13) to the end of the side surface (41) of the hollow portion. The bottom of the recess (42) and the front of the housing (1
It is formed in 1). The central axis X of the opening (12) (hereinafter referred to as the X axis) is an axis that passes through the center of the opening (12) and is perpendicular to the plane including the opening peripheral edge (13). The recess side surface (41) forms a cylindrical surface extending along the X axis, and the diameter thereof also forms the cylindrical surface.
It is slightly larger than the outer diameter of the rear end of the
When the fixing ring member (5) is inserted into (4), the recess side surface (4
Using 1) as a guide, the fixing ring member (5) can be easily attached at a predetermined position. Further fixed ring member
The (5) can be mounted on the front surface (11) of the housing stably and firmly. The recess side surface (41) may be tapered so as to gradually widen toward the outside of the housing (1).

The fixed ring member (5) has a central axis Y (hereinafter,
It is based on an annular shape that is rotationally symmetric with respect to the Y axis). The fixing ring member (5) is divided into an insertion portion (56) fitted into the recess (4) and a protruding portion (57) protruding from the housing front surface (11) when the housing (1) is mounted. To be done. Further, the outer peripheral surface (55) of the fixed ring member (5) is formed into a cylindrical surface having the Y axis as a central axis in the insertion portion (56), and the protruding portion (57)
It is formed into a tapered cylindrical surface whose diameter decreases toward the tip. Inner peripheral surface (54) of the fixing ring member (5)
Form a cylindrical surface having a diameter substantially the same as the opening diameter and having the Y axis as the central axis.

FIG. 6 shows a part of a cross section of the fixing ring member (5) taken along a plane including the line AA in FIG. The fixed ring member (5) has an inner wall portion (51) forming an inner peripheral surface (54).
An outer wall portion (52) forming the outer peripheral surface (55), and a tip portion (53) connecting the inner wall portion (51) and the outer wall portion (52) at the tip of the fixed ring member (5). . The inside of the fixed ring member (5) is hollow, and the inner wall portion (51) and the outer wall portion (52) are separated from each other on the rear end of the fixed ring member (5), that is, on the side that contacts the bottom surface (42) of the recess. ing. Therefore, when a force in the direction perpendicular to the Y-axis is applied inward to the outer wall portion (52), the outer wall portion (5
The outer wall portion (52) is deformed so as to reduce the distance between the inner wall portion (51) and the inner wall portion (2).

In the present embodiment, the fixing ring member (5) and the recessed portion (4) have the above-mentioned shapes. For example, Y of the outer peripheral surface (55) of the insertion portion (56) of the fixing ring member (5) is Y. The width W in the axial direction may change around the Y axis, that is, along the outer circumference of the outer peripheral surface (55). The step of the recess (4), that is, the length L of the recess side surface (41) in the X-axis direction may also change around the X-axis, that is, along the outer edge (13) of the opening. Further, the outer peripheral surface (55) of the fixed ring member (5) does not necessarily have to be formed into a tapered cylindrical surface in the protruding portion (57), and the inner peripheral surface (54) of the fixed ring member (5) is completely formed. It does not have to be a cylindrical surface.

Next, the coupling means according to the present invention will be described. As shown in FIGS. 2 to 4, the fixing ring member (5)
On the outer peripheral surface (55) of the insertion portion (56), concave portions (58) are formed at predetermined intervals around the Y axis. The coupling means corresponds to the lock rib mechanism (6) provided in the recess (58), and can be coupled to the lock rib mechanism (6) corresponding to the lock rib mechanism (6), that is, when the fixing ring member (5) is mounted. The lock groove mechanism (7) provided in the recess (4) at the position. The recessed portion (58), the lock rib mechanism (6) and the lock groove mechanism (7) allow
When fitted in (4), the fixed ring member (5) can be positioned in the rotation direction Q about the Y axis (hereinafter referred to as the circumferential direction Q), and then the fixed ring member (5) is moved in a predetermined direction. By rotating, the lock rib mechanism (6) and the lock groove mechanism (7) are combined.

In this embodiment, the three recesses (58) have the insertion portions (5
The outer peripheral surface (55) of (6) is formed at equal intervals, three lock rib mechanisms (6) are provided in the same arrangement for each recess (58), and three lock groove mechanisms (7) are provided at the opening peripheral edge. The depressions (4) are provided at equal intervals on the (13). The number of sets of the concave portion (58), the lock rib mechanism (6), and the lock groove mechanism (7) does not necessarily have to be three, but the fixing ring member (5) is stabilized on the front surface (11) of the housing. It is desirable to have three or more to attach to. Further, it is not always necessary to arrange these at equal intervals. However, in order to attach the fixing ring members (5) stably, it is preferable to arrange them at substantially equal intervals. The lock groove mechanism (7) must be attached to the detachable part (2) and the main body.
(3) need to be placed on both sides, that is, lock rib mechanism
(6) and the lock groove mechanism (7) need to be arranged so that the fixing ring member (5) can be coupled with both the detachable part (2) and the main body part (3).

FIG. 7 (a) is a top view of the periphery of the lock rib mechanism (6). 7 (b) is a cross-sectional view taken along the plane including the line BB in FIG. 7 (a), and FIG. 7 (c) is C in FIG. 7 (a).
It is sectional drawing fractured | ruptured by the plane containing the -C line. Recessed (58)
The lock rib mechanism (6) provided in the lock rib mechanism (6) includes a guide rib (62) and a lock rib (63), and the recess (58) has a portion of the outer wall portion (52) including the rear end of the fixed ring member (5). , And is formed by being recessed in the direction perpendicular to the Y-axis direction. On the rear end side of the fixed ring member (5), the recess (58) has an opening (58c), and the wall surface of the recess (58) does not exist. On one wall surface (58a) of the two recess wall surfaces along the Y-axis direction, a rectangular guide rib (6) is provided from the position on the rear end side of the fixed ring member (5).
2) is protruding along the circumferential direction Q. The guide rib (62)
Is connected to the bottom surface (58b) of the recess, and the height of the guide rib (62) from the bottom surface (58b) of the recess is approximately the same as the depth of the recess (58). A guide piece (71) described later is provided with an opening (58c) of the recess (58).
So that the guide rib (62) can be fitted with the guide piece (71).
Is less than half the length of the recess 58 in the circumferential direction Q. Further, a sliding portion (62a), which is a minute convex portion, is formed on the rear surface of the guide rib (62), and by contacting this with the bottom surface (42) of the recessed portion, the entire rear end surface of the fixed ring member (5) is formed. The fixed ring member (5) can be rotated more smoothly than the contact of the fixed ring member (5).

Near the center of the front face of the guide rib (62b),
A lock rib (63) is provided so as to project along the Y-axis direction. The lock rib (63) is connected to the bottom surface (58) of the recess, and the height of the lock rib (63) from the bottom surface (58) of the recess is equal to that of the guide rib (6).
It is slightly lower than the height of 2). Further, as shown in FIG. 7B, the lock rib upper end portion (63a) is formed so as to have a semicircular cross section with respect to a plane perpendicular to the Y-axis direction. The length of the lock rib (63) along the Y-axis direction is approximately the same as the thickness of the guide piece (71) described later.

FIG. 8 (a) is a front view of the vicinity of the lock groove mechanism (7). 8B is a cross-sectional view taken along the plane including the line D-D in FIG. 8A, and FIG. 8C is a sectional view taken along line E-E in FIG. 8A.
It is sectional drawing which was fractured | ruptured by the plane containing a line. Lock groove mechanism
(7) is the circumferential direction P of the opening outer edge (13) from the side surface (41) of the recess.
Along with the guide piece (7
Including 1). The end of the guide piece (71) hangs toward the inside of the housing (1) at a substantially right angle and is connected to the bottom surface (41) of the recess. The inner surface of the guide piece (71) and the bottom surface (42) of the recessed portion form a guide groove (72) into which the guide rib (62) fits. The stopper portion (75) functions to limit the movement of the guide rib (62) in the circumferential direction P during the coupling. On the lower edge of the guide piece (71),
A lock groove (74), which is a round groove into which the tip portion (63a) of the lock rib (63) can be fitted, is provided along the X-axis direction. The corner (7) of the guide piece (71) located on the opposite side of the stopper (73)
1a) is formed in an arc shape. Also, the bottom of the recess (42)
A substantially rectangular attachment guide rib (43) is provided along the circumferential direction P at a position separated from the guide piece (71) toward the opening peripheral edge (13) by a predetermined distance.

The functions of the lock rib mechanism (6) and the lock groove mechanism (7) will be described with reference to FIG. FIG. 9 is a front view of the periphery of the lock groove mechanism (7). For the sake of explanation, the fixing ring member (5) is shown.
The cross section of FIG. Insertion part (56) of the fixing ring member (5)
Is inserted into the recess (4). Guide piece (71) in the recess opening (58c)
When the fixing ring member (5) is inserted such that the insertion portion (56) is positioned, the insertion portion (56) is completely fitted and inserted in the recessed portion (4). In other cases, since the rear end surface of the outer wall portion (52) of the fixed ring member (5) and the guide piece (71) interfere with each other, the fixed ring member (5) should be completely inserted into the recess (4). , That is, the guide rib
The sliding portion (62a) of (62) cannot abut on the bottom surface (42) of the recess. In this case, when the fixing ring member (5) is appropriately rotated, the guide piece (71) is positioned in the recess opening (58c),
The fixed ring member (5) is fitted into the recess (4) (S1).

Next, the fixed ring member (5) is rotated clockwise. The tip of the guide rib (62) will then
(72), enter the lock rib upper end (63a) and the guide piece (7
The corner (71a) of 1) abuts. The lock rib upper end portion (63a) has a semicircular cross section, and the guide piece (71) has a corner portion (71a) formed in an arc shape, so that the outer wall portion (52) of the fixing ring member (5) is A pushing force is generated inward in the direction perpendicular to the Y-axis direction, and the outer wall portion (52) is locally elastically deformed around the lock rib mechanism (6). Then, since the peripheral portion of the lock rib mechanism (6) is displaced toward the inner wall portion (51), the lock rib upper end portion (63a) is in contact with the lower end portion of the guide piece (71),
Further, the fixed ring member (5) is rotated (S2).

Further, the fixing ring member (5) is rotated clockwise. The guide rib (62) further enters the guide groove (72), and when the lock rib (63) reaches below the lock groove (74),
The elastic deformation of the peripheral portion of the lock rib mechanism (6) is returned or alleviated, whereby the upper end portion (63a) of the lock rib fits into the lock groove (74). At this time, the stopper (7
The contact between 3) and the guide rib (62) prevents further rotation of the fixed ring member (5). As a result, the lock rib mechanism (6) and the lock groove mechanism (7) are coupled (S3).

FIG. 10 (a) is a sectional view taken along line FF in FIG. By fitting the lock rib (63) into the lock groove (74), the rotation of the fixed ring member (5) around the X axis on the front surface (11) of the housing is restricted. In addition, guide ribs (6
The movement of the fixed ring member (5) in the X-axis direction is restricted by the fact that 2) fits into the guide groove (72). The lock ring mechanism (6) and the lock groove mechanism (7) can be released from each other by rotating the fixed ring member (5) counterclockwise.
The fixing ring member (5) can be removed by returning to the state of S1 and then pulling out the fixing ring member (5) from the recess (4).

The projection display device of the present invention has a lock groove mechanism.
A mounting guide rib (43) is provided on (7). Although it is possible to position and fix the fixed ring member (5) to the front housing without the mounting guide ribs (43), the fixed ring member (5) can be fixed to the outer wall portion (52) of the fixed ring member (5) in the direction perpendicular to the X-axis direction. Inner wall
When an excessive force in the (51) direction is applied, the guide rib (62) separates from the guide groove (72) as shown in FIG. 10 (b).
In this state, if a force that pulls out the fixed ring member (5) is applied in the Y-axis direction, the lock rib mechanism (6) and the lock groove mechanism
The combination of (7) is released. Other Lock Rib Mechanism (6)
If the lock groove mechanism (7) and the lock groove mechanism (7) are coupled together, undue stress will be exerted, causing a situation in which the fixing ring member (5) is distorted and damaged. The mounting guide ribs (43) prevent such a situation.

As shown in FIGS. 9 and 10 (a), when the fixing ring member (5) is fixed to the front surface (11) of the housing, the mounting guide ribs (43) are attached to the fixing ring member (5). It is located between the outer wall portion (52) and the inner wall portion (51), and is provided so as to project at a position where it interferes with the outer wall portion (52) when the above deformation occurs. Therefore, the outer wall portion (52) is prevented from being deformed such that the guide rib (62) is detached from the guide groove (72). In this embodiment, the mounting guide rib (43) is a rectangular piece along the circumferential direction P, but the shape is not particularly limited as long as the above object can be achieved.

The mounting guide rib (43) should be attached to the guide piece (7
1) It is possible to reduce the deformation of the outer wall portion (52) within a small range by arranging it closer, but as shown in FIG. 9, when the fixing ring member (5) is attached, the outer wall portion (52) is Since the elastic deformation locally occurs (S2), the mounting guide rib (43) needs to be separated from the guide piece (71) to such an extent that it does not interfere with the outer wall portion (52) in this case. In addition, mounting guide ribs (43)
Needs to be provided at a position that does not interfere with the inner wall portion (51) when the fixing ring member (5) is attached.

In the present embodiment, the concave portion (58), the lock rib mechanism (6) and the lock groove mechanism (7) have the same shape, but a specific lock rib mechanism (6) and a specific lock groove mechanism are used.
It is sufficient if (7) can be combined, and it is not always necessary to do this. Further, in this embodiment, the lock rib (63) is provided so as to project from the recess wall portion (58a) and the recess bottom portion (58b), but it may be provided so as to project from at least one of them. The guide rib (62) does not have to be provided integrally with the lock rib (63), and may be provided so as to project from at least one of the guide rib front surface (62b) and the recess bottom portion (58b). Further, in this embodiment, the guide piece (71) is provided with the lock groove (73),
The lock groove (73) may be formed in a member formed separately from the guide piece (71).

FIG. 11 (a) is an exploded top view of the projection type display device according to the present invention in which a normal projection lens unit (8) is mounted. FIG. 11B shows a wide-angle lens unit.
It is an exploded top view when (8a) is attached. These figures show the state before the attaching / detaching part (2) is attached. Figure 11 (a)
As shown in Figure 4, when installing the normal projection lens unit (8), fix it to the holding means in the projection display device, then attach the detachable part (2) to the main body part (3) and Attach the fixing ring member (5) to. As shown in FIG. 11 (b), when the wide-angle lens unit (8a) is attached, the fixing ring member
(5) is not used. Wide-angle lens unit instead
The front part of (8a) is near the notch (33), that is, the detachable part (2)
It is located near the opening (12) after the installation. Since the recessed part (4) is formed around the opening (12) on the front surface (11) of the housing, the front part of the wide-angle lens unit (8a) does not interfere with the housing (1). ) It is possible to spread in a taper shape from the vicinity.

The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or limiting the scope. The configuration of each part of the present invention is not limited to the above-mentioned embodiment, and it goes without saying that various modifications can be made within the technical scope described in the claims.

[Brief description of drawings]

FIG. 1 is a perspective view of a projection display device according to the present invention.

FIG. 2 is a front view of the periphery of the front surface of the housing, showing a state in which the attachment / detachment portion and the fixing ring member are separated in the projection display device according to the present invention.

FIG. 3 is a top view around the front surface of the housing showing a state in which the detachable portion and the fixing ring member are separated in the projection display device according to the present invention.

FIG. 4 is a side view around the front surface of the housing showing a state in which the detachable portion and the fixing ring member are separated in the projection display device according to the present invention.

FIG. 5 is a front view of the front surface of the housing showing a state in which the detachable portion is attached to the main body portion in the projection display device according to the present invention.

6 is a cross-sectional view of the fixing ring member of the projection display device according to the present invention, taken along a plane including line AA in FIG.

FIG. 7 is a view showing the periphery of the lock rib mechanism according to the present invention. 7 (a) is a top view, FIG. 7 (b) is a cross-sectional view taken along the plane containing the line BB, and FIG. 7 (c) is a cross-sectional view taken along the plane containing the line C-C. .

FIG. 8 is a view showing the periphery of a lock groove mechanism according to the present invention. 8 (a) is a front view, FIG. 8 (b) is a sectional view taken along a plane including the line D-D, and FIG. 7 (c) is a sectional view taken along a plane including the line E-E. .

9A and 9B are views for explaining a coupling process of the lock rib mechanism and the lock groove mechanism according to the present invention.

FIG. 10 (a) is a cross-sectional view of the lock rib mechanism and the lock groove mechanism according to the present invention, taken along a plane including the line FF. FIG. 10B is a cross-sectional view showing a state in which the mounting guide rib does not exist.

FIG. 11 (a) is an exploded top view of the projection display apparatus according to the present invention with a normal projection lens unit attached. FIG. 11B is an exploded top view when the wide-angle lens unit is mounted.

FIG. 12 is an exploded perspective view of a conventional projection display device.

[Explanation of symbols]

(1) Case (10) Space (11) Front of chassis (12) Opening (13) Opening edge (2) Desorption part (21) Top surface of desorption section (22) Front of removable part (23) Notch (3) Main body (33) Notch (4) Recess (42) Bottom of recess (43) Mounting guide rib (5) Fixed ring member (51) Inner wall (53) Front wall (55) Outer surface (58) Recess (58a) Recessed wall surface (58b) Bottom of recess (6) Lock rib mechanism (62) Guide rib (62b) Guide rib front (63) Lock rib (7) Lock groove mechanism (72) Guide groove (74) Lock groove (8) Projection lens unit

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Koji Okada             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. F-term (reference) 5C058 BA35 EA02 EA12 EA42 EA54

Claims (4)

[Claims] 1. A housing (1) for accommodating constituent devices such as a projection lens unit (8) and a light valve, the housing (1)
Is a detachable part having a part (21) of the upper surface of the housing located above the projection lens unit (8) and a part (22) of the front surface of the housing connected to part (21) of the upper surface of the housing. 2) and a main body part (3) to which the detachable part (2) is detachably mounted, and arc-shaped notches provided in the detachable part (2) and the main body part (3) respectively.
(23) (33) is connected to the front surface of the housing (11) in the projection display device in which a circular opening (12) through which the projection lens unit (8) is inserted is opened in the front surface (11) of the housing. It has a substantially annular fixing ring member (5) that is detachably attached to the opening (12), and the front surface (11) of the housing has a fixing ring at a certain distance from the opening peripheral edge (13). A recess (4) in which the member (5) is fitted is formed, and the fixing ring member (5) and the recess (4) are provided with the fixing ring member.
A projection display device, characterized in that a coupling means for coupling the (5), the detachable part (2) and the main body part (3) is formed. 2. The fixing ring member (5) comprises a substantially cylindrical inner wall portion (51), a substantially cylindrical outer wall portion (52) having a diameter larger than the inner wall portion (51), and a fixing ring member (5). 5) The inner wall (5
1) and the front wall portion (53) connected to the outer wall portion (52), and the space between the inner wall portion (51) and the outer wall portion (52) is opened at the rear end of the fixing ring member (5). And the connecting means is
The projection display device according to claim 1, wherein the fixing ring member (5), the detachable portion (2), and the main body portion (3) are coupled by utilizing elastic deformation of the outer wall portion (52). 3. The outer wall portion (52) of the fixed ring member (5) is opened at a rear end of the fixed ring member (5) at predetermined intervals around the central axis Y of the fixed ring member (5). A recess (58) is formed, and the coupling means is provided in the recess (4) at a predetermined interval around the central axis X of the opening (12) and the lock rib mechanism (6) provided in the recess (58). The lock rib mechanism (6) is configured to project into at least one of the recess wall surface (58a) and the recess bottom surface (58b) along the rotation direction Q about the central axis Y. A guide rib (62) provided, and a lock rib (63) protruding along at least one of the guide rib front face (62b) and the recess bottom face (58b) along the central axis Y direction of the fixed ring member (5). The projection mold according to claim 2, wherein the lock groove mechanism (7) includes a guide groove (72) into which the guide rib (62) fits and a lock groove (74) into which the lock rib (63) fits. table Apparatus. 4. The mounting guide rib (43) for limiting deformation of the outer wall portion (52) of the fixed ring member (5) between the guide groove (72) and the opening peripheral edge (13) on the bottom surface (42) of the recess. 4. The projection display device according to claim 3, wherein the projection is provided.