JP2001188302A - Holding mechanism of planar member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a holding mechanism capable of holding planar members, such as liquid crystal mounting plates, in home positions without being affected by the variations in the dimensions of the parts of the planar members and without clattering and is capable of holding the planar members without deformation by adjusting a holding power quantity. SOLUTION: The holding mechanism for the planar members has a base part 101 which is fixed to the main body side of the device, such as a liquid crystal projector, and a pair of holding parts (arms) 102 and 103 which are projectingly disposed at two points of the base part and are arranged to face each other and at least one of which is disposed movably an air pressure or elastic force, etc. The one arm 102 has two pawl parts 105 and 106 and the other arm 103 has one pawl part 107. The respectively pawl parts of the two arms are engaged with the upper and lower or right and left two sides of the planar member 104, such as the liquid crystal panel mounting plate, and the planar member is grasped and is held in the home position by the two arms. The holding power quantity is regulated by adjusting the air pressure or the elastic force, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal panel mounting plate on which a liquid crystal panel is mounted, or a plate-like member such as a glass substrate, a glass epoxy substrate, a pressed part, etc. The present invention relates to a holding mechanism for a plate-like member that can be held in a fixed position without being deformed, and particularly to a plate optimally used as a mechanism for holding a liquid crystal panel mounting plate on which a liquid crystal panel is mounted in a single-panel or three-panel liquid crystal projector. The present invention relates to a holding mechanism for holding a member.

[0002]

2. Description of the Related Art After transmitting light from an illumination light source through a liquid crystal panel, a single-plate type liquid crystal projector that projects the light on a screen with a projection lens or an illumination light source is separated into three colors of green, red, and blue. There is known a three-panel type liquid crystal projector in which respective lights are transmitted through three liquid crystal panels, then combined by a prism, and projected on a screen by a projection lens. Conventionally, in this type of liquid crystal projector,
As a mechanism for holding the liquid crystal panel mounting plate to which the liquid crystal panel is mounted, for example, a holding mechanism having a configuration as shown in FIGS. 4 and 5 (see Japanese Utility Model Laid-Open No. 5-36422) can be cited.

FIG. 4 is a front view of a holding mechanism for a liquid crystal panel mounting plate, and FIG. 5 is a side view. In FIGS. 4 and 5, reference numeral 10 is a bracket, 12 is a liquid crystal panel mounting plate, 14 is a fixing screw, and 18 is a liquid crystal. Panel, 20 is a jig, 21 is a jig fixing screw, 22 is a fixing member, 23 is a rotating member, 24 is a Y direction moving member, 25 is an X direction moving member, 26 is a θ direction adjusting screw, and 27 is a θ direction adjusting screw. Screw, 28 is X direction adjusting screw, 2
9 denotes a Y-direction adjusting screw, 30 denotes a liquid crystal panel mounting plate clamp screw, 31 denotes a screw mounting member, and 32 and 33 denote clamp members.

As a holding method, as shown in FIG. 5, a hook-shaped screw attaching member 1 and a clamp member 32 are integrally provided on an X-direction moving member 25, and a liquid crystal is attached to the screw attaching member 31. A panel mounting plate clamp screw 30 is screwed, and a clamp member 33 that moves forward and backward with respect to the clamp member 32 by rotation of the liquid crystal panel mounting plate clamp screw 30 is arranged. Then, the fixing member 22 of the jig 20 is fixed on the bracket 10 as a liquid crystal panel holding member by the jig fixing screw 21. Subsequently, the liquid crystal panel mounting plate clamp screw 30 is turned, and the liquid crystal panel mounting plate 12 is moved between the fixed clamp member 32 and the clamp member 33 moved by the liquid crystal panel mounting plate clamp screw 30.
Clamp.

In the above-mentioned conventional holding mechanism, the liquid crystal panel mounting plate 12 is sandwiched between the fixed clamp member 32 and the clamp member 33 which is moved by the liquid crystal panel mounting plate clamp screw 30, so that the liquid crystal panel mounting plate 12 is held.
However, depending on the shape variation of the parts, there is a possibility that the liquid crystal panel mounting plate 12 and the liquid crystal panel 18 may be stressed by the holding. Also, the jig 20
Is fixed to the jig fixing screw 21 and then the liquid crystal panel mounting plate 12 is held by the liquid crystal panel mounting plate clamp screw 30. Therefore, it is difficult to mount and remove the jig.

[0006]

In a three-panel liquid crystal projector, an electric signal is sent to each of the green, red, and blue liquid crystal panels to form the same image on each panel surface, and illumination light is applied to each of the liquid crystal panels. To combine the image with the prism,
The projection lens magnifies it about 30 times on the screen and projects it. For this reason, a slight positional deviation between the panels is greatly increased, and it is necessary to adjust the relative positions between the panels with a high precision of the order of μm. However, the liquid crystal panel mounting plate on which the liquid crystal panel is mounted is held by the holding mechanism. In this case, the required accuracy cannot be satisfied if there is a deformation or a play due to the holding force as in the prior art.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a plate-like member such as a liquid crystal panel mounting plate (or a glass substrate, a glass epoxy substrate, or a pressed part) is left and right depending on the component size variation of the plate-like member. An object of the present invention is to provide a holding mechanism that can hold a fixed member without any backlash and can hold a plate-shaped member such as a liquid crystal panel mounting plate by changing a holding force without deformation.

[0008]

As a means for solving the above-mentioned problems, a plate-like member holding mechanism according to the present invention comprises two parts, a base fixed to a main body of an apparatus such as a liquid crystal projector and the base. At least one of which is provided so as to protrude from and is movably provided with at least one of the pair of holding portions.
The holding means engages with the side, holds the plate-shaped member between the pair of holding portions and holds the plate member in a fixed position, and means for adjusting a holding force of the pair of holding portions of the holding means. (Claim 1).

Further, in the plate-shaped member holding mechanism according to the present invention, in addition to the above-mentioned structure, of the pair of holding portions of the holding means, one holding portion has two claw portions and the other holding portion has two claw portions. Has one claw portion, engages each claw portion of the pair of holding portions with the upper and lower sides or left and right sides of the plate-like member, and pinches the plate-like member between the pair of holding portions to fix the position. (Claim 2). In addition to the above configuration,
Each claw portion provided on the pair of holding portions of the holding means is provided with a groove, a concave portion, or a protrusion, and a portion opposed to each of the claw portions on the upper and lower sides or on the left and right sides of the plate-like member, A groove, a concave portion, or a hole in which the groove, the concave portion, or the protrusion of each of the claws is engaged is provided. When the plate-like member is sandwiched between the pair of holding portions, the groove or the concave portion on the claw portion side is formed. A configuration may be employed in which the projection is engaged with a projection, a concave portion, or a hole on the plate-like member side to hold the plate-like member in a fixed position without rattling.

Further, in the plate-shaped member holding mechanism according to the present invention, in addition to the above-described structure, at least one of the pair of holding portions may be used as a means for adjusting a holding force by the pair of holding portions of the holding means. An air pressure may be applied to one side, and the air pressure may be adjusted to adjust the amount of holding force (claim 4). Alternatively, as a means for adjusting the amount of holding force by a pair of holding portions of the holding means, a pair of holding forces may be used. An elastic force may be applied to at least one of the holding portions, and the elastic force may be adjusted to adjust the amount of the holding force.

Further, as an example of a specific configuration of the holding mechanism of the plate-like member according to the present invention, the holding means includes a cross roller bearing type parallel air hand having two arms (102, 103) as a pair of holding portions. 100), at least one of the two arms (102, 103) is movably provided by air pressure, and
One arm (102) has two claws (105, 10).
6) The other arm (103) has one claw (10
7), and each claw (105, 106, 107) of the two arms (102, 103) is attached to a plate-like member (104).
And the two arms hold the plate-shaped member between the two arms and hold it in a fixed position, and adjust the holding force by adjusting the air pressure. (Claim 6).

In the plate-shaped member holding mechanism according to the present invention, the pair of holding portions are engaged with the upper, lower, left and right sides of the plate-shaped member, and the pair of holding portions sandwich the plate-shaped member. Since it is provided with a holding means for holding in a fixed position and a means for adjusting a holding force of a pair of holding portions of the holding means, a plate-like member such as a liquid crystal panel mounting plate can be used as a component of the plate-like member. It is possible to hold the plate-like member such as the liquid crystal panel mounting plate without deformation by adjusting the amount of holding force without being affected by the variation. In addition, since at least one of the pair of holding portions is provided so as to be movable, it is possible to move at least one side of the pair of holding portions and to attach / detach the plate-shaped member very easily. .

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure, operation and operation of the present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 is a perspective view of a holding mechanism showing a first embodiment of the present invention.
This holding mechanism is an example of a holding mechanism for holding the liquid crystal panel mounting plate 104 on which the liquid crystal panel 111 is mounted in the liquid crystal projector.
As a holding unit 100 that holds the base unit 04, the base unit 101 is fixed to a device main body of a liquid crystal projector (not shown),
This is an example in which a cross roller bearing type parallel air hand having two arms 102 and 103 is used as a pair of holding portions. The two arms 102 and 103 of the holding means 100 using this cross roller bearing type parallel air hand.
At least one of them is provided so as to be movable by air pressure, and one arm 102 has two claw portions 105 and 106 having a V-groove shape at the tip end, and faces the liquid crystal panel mounting plate 131. The other arm 103 has one claw 107 having a V-shaped groove at the tip.
And each claw part 10 of the two arms 102 and 103
5, 106, 107 V-groove-shaped portions are provided on the upper and lower sides of the liquid crystal panel mounting plate 104 by protrusions 108, 109, 1
10, the two arms 102 and 103 sandwich the liquid crystal panel mounting plate 104 to hold the liquid crystal panel mounting plate 104 in a fixed position, and adjust the holding force by adjusting the air pressure.

The operation of the holding mechanism of the present embodiment will now be described. In FIG. 1, the movable components of the liquid crystal panel mounting plate 104 are represented by six components of three directions of X, Y, and Z and rotational components of α, β, and γ. When considered when disassembled, the V-groove of the projection 110 provided on the lower side of the liquid crystal panel mounting plate 104 and the V-groove of the claw 107 of the lower arm 103 of the holding mechanism 100 engage and engage with each other. As a result, the movable components in the X, Y, and Z directions are fixed,
It is possible to restrict only the rotational components in the α, β, and γ directions around the engagement portion. Also, the liquid crystal panel mounting plate 1
04 and the claw portion 10 of the upper arm 102 of the holding mechanism 100.
By engaging and engaging the 5, 106 V grooves, α,
The rotation components in the β and γ directions can be fixed. Therefore, each claw 105, 1 of the two arms 102, 103
06, 107 are attached to the liquid crystal panel mounting plate 10
The above-mentioned six movable components are fixed by being engaged with the projections 108, 109 and 110 provided on the upper and lower two sides of 4 and holding the liquid crystal panel mounting plate 104 between the two arms 102 and 103, so that the movable components are fixed. By adjusting the amount of holding force by adjusting the air pressure acting on at least one of the two arms 102 and 103, the liquid crystal panel mounting plate 104 can be held in place without rattling. Can be held. When the liquid crystal panel mounting plate 104 is removed, the air pressure acting on at least one of the two arms 102 and 103 is reduced, and the arm is moved in a direction away from the liquid crystal panel mounting plate 104 to thereby remove the liquid crystal panel. The mounting plate 104 can be easily removed. Therefore, in the holding mechanism of the present embodiment, the attachment / detachment of the liquid crystal panel attachment plate 104 is easy.

FIG. 2 is a perspective view of a main part of a holding mechanism according to a second embodiment of the present invention. This holding mechanism uses a cross roller bearing type parallel air hand as the holding means as in FIG. However, in the figure, only the configuration of two arms 202 and 203 as a pair of holding members and the liquid crystal panel mounting plate 204 is shown. The configuration of the holding mechanism shown in FIG. 2 other than the arms 202 and 203 is the same as that shown in FIG. In the present embodiment, the lower arm 202 with respect to the figure has two claw portions 205 and 206 having a conical protrusion at the tip,
The other arm 2 facing the liquid crystal panel mounting plate 204
03 is one claw 207 having a conical protrusion at the tip.
have. A bent hole 210 on the upper side of the liquid crystal panel mounting plate 204 is provided with a circular hole to be fitted with a conical projection provided on the claw portion 207 of the upper arm 203 of the holding mechanism. The two bent portions 208 and 209 are provided with long holes that fit into the conical projections provided on the two claws 205 and 206 of the lower arm 202 of the holding mechanism. And each claw part 205,206,207 of two arms 202,203
Is bent at the upper and lower two sides of the liquid crystal panel mounting plate 204.
8,209,210, and each claw part 205,206,
207 conical protrusions and each of the bent portions 208 and 20
9, 210, and two arms 202,
The liquid crystal panel mounting plate 204 is pinched and held at a fixed position by 203, and the holding force is adjusted by adjusting the air pressure.

In the case of this configuration, the two arms 202, 2
Since the conical projection provided on each of the claws 205, 206, and 207 of No. 03 is fitted with the elongated holes and the circular holes provided on the bent portions 208, 209, and 210 on the upper and lower sides of the liquid crystal panel mounting plate 204. Thus, the liquid crystal panel mounting plate 204 can be held at a fixed position without any backlash without being deformed.
Further, the two claw portions 20 of the lower arm 202 of the holding mechanism are provided.
Since the two holes on the lower side of the liquid crystal panel mounting plate 204 with which the conical protrusions provided on the liquid crystal panel mounting plates 5 and 206 are engaged are provided as elongated holes to provide a slight play, the variation in parts of the liquid crystal panel mounting plate 204 is absorbed. be able to.

FIG. 3 is a perspective view of a main part of a holding mechanism according to a third embodiment of the present invention. This holding mechanism uses a cross roller bearing type parallel air hand as holding means as in FIG. However, in the figure, only the configuration of the two arms 302 and 303 as a pair of holding members and the liquid crystal panel mounting plate 304 is shown. The configuration of the holding mechanism shown in FIG. 3 other than the arms 302 and 303 is the same as that shown in FIG. In the present embodiment, the lower arm 302 in the figure has two claw portions 305 and 306 having spherical projections at the distal ends, and the other arm 30 is opposed to the liquid crystal panel mounting plate 304.
3 has one claw 307 having a spherical projection at the tip. A bent hole 310 on the upper side of the liquid crystal panel mounting plate 304 is provided with a circular hole to be fitted with a spherical projection provided on the claw portion 307 of the upper arm 303 of the holding mechanism. The lower arm 202 of the holding mechanism is attached to the two bent portions 308 and 309.
The two claw portions 305, 306 are provided with elongated holes to be fitted with spherical projections. And two arms 3
02 and 303 are bent at the upper and lower two sides of the liquid crystal panel mounting plate 304.
9, 310, and the spherical projections of the claws 305, 306, 307 and the bent portions 308, 309, 310
The two arms 302 and 303 hold the liquid crystal panel mounting plate 304 so as to hold the liquid crystal panel mounting plate 304 in a fixed position, and adjust the holding force by adjusting the air pressure.

In the case of this configuration, the two arms 302, 3
03, the spherical projections provided on the claw portions 305, 306, 307 and the elongated holes and the circular holes provided on the bent portions 308, 309, 310 on the upper and lower sides of the liquid crystal panel mounting plate 304 are fitted. In addition, the liquid crystal panel mounting plate 304 can be held at a fixed position without rattling without being deformed. Also, two claw portions 305 of the lower arm 302 of the holding mechanism,
Since the two holes on the lower side of the liquid crystal panel mounting plate 304 with which the spherical projections provided on the liquid crystal panel mounting plate 306 are engaged are provided as elongated holes to provide a slight play, it is possible to absorb variations in parts of the liquid crystal panel mounting plate 304. it can.

In the first to third embodiments described above, a cross roller bearing type parallel air hand is used as the holding means, and at least one of the two arms can be moved by air pressure. Although the holding force amount is adjusted by adjusting, the means for adjusting the holding force amount by the pair of arms of the holding mechanism is to apply an elastic force to at least one of the pair of arms and adjust the elastic force. The holding force may be adjusted by adjusting the holding force. More specifically, in a configuration similar to that of FIG.
A tension spring may be provided between the two springs 103 to adjust the amount of force of the tension spring to adjust the amount of holding force. It is also possible to use a cross roller stage or a ball roller stage having the same function as the cross roller bearing type parallel air hand without play, and to adjust the holding force by adjusting the amount of force of the tension spring provided on these. It can also be configured.

In the above embodiment, an example of the holding mechanism for holding the liquid crystal panel mounting plate on which the liquid crystal panel is mounted in the liquid crystal projector has been described.
It is characterized by being able to be held in a fixed position without being affected by variations in component dimensions and being able to be held without being deformed.Therefore, in addition to the liquid crystal panel mounting plate, glass substrates, glass epoxy substrates, pressed parts, etc. It can also be used as a holding mechanism for a precision positioning device.

[0021]

As described above, in the plate member holding mechanism according to the present invention, the pair of holding portions are engaged with the upper and lower or left and right sides of the plate member, and Since it is provided with holding means for holding the plate-shaped member and holding it in a fixed position, and means for adjusting the amount of holding force by a pair of holding portions of the holding means (Claim 1), a liquid crystal panel mounting plate or the like is provided. The plate-like member can be held at a fixed position without being affected by the variation in the component dimensions of the plate-like member, and the plate-like member such as a liquid crystal panel mounting plate can be deformed by adjusting the holding force. Can be held without. Further, since at least one of the pair of holding portions is provided so as to be movable, it is possible to move at least one side of the pair of holding portions and to attach / detach the plate member very easily.

Further, in the plate-shaped member holding mechanism according to the present invention, in addition to the above-described configuration, of the pair of holding portions of the holding means, one holding portion has two claws and the other holding portion has two claws. Has one claw portion, engages each claw portion of the pair of holding portions with the upper and lower sides or left and right sides of the plate-like member, and pinches the plate-like member between the pair of holding portions to fix the position. (Claim 2), one side of the plate-shaped member such as a liquid crystal panel mounting plate is held at one point and the other side is held at two points. Part size variations can be absorbed and held in place without rattling. Further, in addition to the above configuration, each claw portion provided on the pair of holding portions of the holding means is provided with a groove, a concave portion, or a projection, and the upper and lower sides or the left and right sides of the plate-like member. In the portion opposed to the claw portion, a projection or a recess or a hole is provided in which the groove or the recess or the projection of each of the claw portions is engaged, and when the plate-shaped member is sandwiched by the pair of holding portions, The claw part side groove or concave part or projection engages with the plate-like member side protrusion or concave part or hole part,
Since the plate-like member is held at a fixed position without rattling (claim 3), each of the claws provided on the pair of holding portions can be reliably engaged with the plate-like member. The positioning of the plate-like member is also reliably performed, and the plate-like member can be held at a fixed position with high precision and without play.

In the plate-like member holding mechanism according to the present invention, in addition to the above-described structure, at least one of the pair of holding portions may be used as a means for adjusting a holding force of the pair of holding portions of the holding means. A configuration (claim 4) in which an air pressure is applied to and adjusted by the air pressure to adjust the amount of holding force, or a means for adjusting the amount of holding force by the pair of holding portions of the holding means, By applying a resilient force to at least one of the above and adjusting the retentive force by adjusting the resilient force (claim 5), the retentive force can be adjusted with a simple configuration. A plate-like member such as a panel mounting plate can be securely held without being deformed.

Further, as a specific configuration example of the holding mechanism of the plate-shaped member according to the present invention, the holding means is a cross roller bearing type parallel air hand having two arms as a pair of holding portions, and the two arms are provided. At least one of them is provided movably by air pressure, and
One arm has two claws, and the other arm has one claw. The claws of the two arms are engaged with the upper and lower sides or the left and right sides of the plate-like member. By holding the plate-like member in a fixed position with an arm and adjusting the holding force by adjusting the air pressure (claim 6), a cross roller bearing type parallel air hand is used. With a simple configuration, a plate-like member such as a liquid crystal panel mounting plate can be held at a fixed position without any backlash without being affected by variations in the dimensions of the plate-like member. Also, since the amount of holding force can be easily adjusted by adjusting the air pressure, a plate-like member such as a liquid crystal panel mounting plate can be reliably held without being deformed.

As described above, the plate-like member holding mechanism according to the present invention can hold the plate-like member at a fixed position without any play without being affected by the dimensional variation of the component of the plate-like member. By adjusting the amount of holding force, a plate-like member such as a liquid crystal panel mounting plate can be held without being deformed. Therefore, the holding mechanism of the present invention is used for a holding mechanism of each liquid crystal panel mounting plate in a three-panel type liquid crystal projector. As a result, the liquid crystal panel mounting plate can be held at a fixed position without deformation and can be held in a fixed position, and the relative position between the liquid crystal panels can be adjusted with high precision on the order of μm. And reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a holding mechanism showing a first embodiment of the present invention.

FIG. 2 is a perspective view of a main part of a holding mechanism according to a second embodiment of the present invention.

FIG. 3 is a perspective view of a main part of a holding mechanism according to a third embodiment of the present invention.

FIG. 4 is a front view of a holding mechanism showing an example of a conventional technique.

FIG. 5 is a side view of the holding mechanism shown in FIG.

[Explanation of symbols]

100: holding means (cross roller bearing type parallel air hand) 101: base 102, 103, 202, 203, 302, 303: arm (holding part) 104, 204, 304: liquid crystal panel mounting plate (plate-like member) 105, 106 , 107, 205, 206, 207, 3
05, 306, 307: claw portions 108, 109, 110: protrusions 208, 209, 210, 308, 309, 310: bent portion 111: liquid crystal panel

Claims (6)

[Claims] 1. A holding mechanism for holding a liquid crystal panel mounting plate or a plate-shaped member such as a glass substrate, a glass epoxy substrate, and a pressed part in a liquid crystal projector, the base being fixed to an apparatus body side of the liquid crystal projector or the like. And a pair of holding portions provided at two sides of the base so as to protrude and be opposed to each other, and at least one of the holding portions is provided movably. A holding means for engaging and holding the plate-like member between the pair of holding portions and holding the plate-shaped member at a fixed position; and a means for adjusting a holding force of the pair of holding portions of the holding means. A plate-shaped member holding mechanism. 2. A holding mechanism for a plate-like member according to claim 1, wherein, of the pair of holding portions of said holding means, one holding portion has two claw portions and the other holding portion has one claw portion. And engaging the claw portions of the pair of holding portions with the upper and lower sides or the left and right sides of the plate-like member, and holding the plate-like member between the pair of holding portions and holding it in a fixed position. Characteristic plate-shaped member holding mechanism. 3. A holding mechanism for a plate-like member according to claim 2, wherein each of the claws provided on the pair of holding portions of said holding means is provided with a groove, a concave portion or a projection, and said plate-like member has Protrusions, recesses, or holes in which the grooves, recesses, or protrusions of the claw portions are engaged are provided at portions of the upper and lower or left and right sides facing the respective claw portions. When the plate-like member is sandwiched, the groove or recess or projection on the claw side engages with the protrusion or recess or hole on the plate-like member side, and the plate-like member is in a fixed position without rattling. A holding mechanism for holding a plate-shaped member, characterized by holding. 4. A holding mechanism for a plate-like member according to claim 1, wherein at least one of said pair of holding portions is provided with air as means for adjusting a holding force of said pair of holding portions of said holding means. A holding mechanism for a plate-shaped member, wherein a holding force is adjusted by applying pressure and adjusting the air pressure. 5. A holding mechanism for a plate-shaped member according to claim 1, wherein at least one of said pair of holding portions has an elasticity as means for adjusting a holding force of said pair of holding portions of said holding means. A holding mechanism for a plate-shaped member, wherein a holding force is adjusted by adjusting a holding force by applying a force and adjusting an elastic force thereof. 6. A holding mechanism for a plate-like member according to claim 1, wherein said holding means is a cross roller bearing type parallel air hand having two arms as a pair of holding portions,
At least one of the two arms is provided so as to be movable by air pressure, and one arm has two claws and the other arm has one claw. The claw portion is engaged with the upper and lower sides or the left and right sides of the plate-like member, and the plate-like member is held by the two arms and held at a fixed position, and the holding force is adjusted by adjusting the air pressure. A plate-shaped member holding mechanism, characterized in that: