JP2008116577A - Height adjustment device and projection type video display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a height adjustment device capable of adjusting the height of a body to be supported by operating an adjustment knob in the same direction as a direction desired to be adjusted. <P>SOLUTION: The height adjustment device has: a screw type adjustment leg 18 for adjusting the height of the housing 12 of the projection type video display device with an projecting amount from the housing 12; a screw piece mechanism 40 screwed together with the adjustment leg 18 to make the adjustment leg 18 project from the housing 12; and a gear mechanism 60 for adjusting the projecting amount of the adjustment leg 18 made to project from the housing 12. The gear mechanism 60 is equipped with: a polygonal shaft 62 that is a nut type fixing tool fixed at the head of the adjustment leg 18 capable of getting in/out of the through-hole 56 of a case fitting part 52 by a male screw for fixing 64; a polygonal cylinder type leg guide 66 guiding the adjustment leg 18 through the polygonal shaft 62; and a disk type adjustment knob 24 having a bevel gear 68 at the center part, and is provided with a bevel gear 67 screwed together with the bevel gear 68 of the adjustment knob 24 at the circumferential end of the leg guide 66. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a height adjusting device that adjusts the height of a supported body, and a projection-type image display device including the height adjusting device.

  Conventionally, when an electronic device such as an OHP and a video display device is arranged on a floor or a table, the height and the elevation angle of the electronic device are often adjusted so that the electronic device maintains a predetermined posture. 2. Description of the Related Art An electronic device provided with a height adjusting device (adjuster) is known so that the height of the electronic device can be adjusted.

There are the following proposals as an electronic device provided with this type of height adjusting device.
In the example of the image display device disclosed in Patent Document 1, when the rotary knob is rotated and the driving force is supplied to the horizontal shaft, the screw gear provided at the other end of the horizontal shaft rotates and the screw gear is provided on the vertical shaft that is screwed. By rotating the gear, the vertical shaft rotates, the screw gear at the tip of the vertical shaft rotates, and the internal thread in the cylinder of the expansion / contraction part of the expansion / contraction foot is screwed so that the expansion / contraction leg moves up and down. The horizontal and elevation angles can be adjusted while viewing the projected image.

  In the example of the adjuster device and the home appliance shown in Patent Document 2, the adjuster device includes a height adjustment shaft, an adjustment leg, and an adjuster case. The height adjustment shaft has a worm attached to the lower portion and a knob attached to the upper portion. The adjusting leg is formed of a shaft having a quadrangular cross section, a rack that engages with the worm is formed over a predetermined length on one surface, and a foot member that contacts the support base is attached to the lower end. Rotate the knob attached to the outside of the adjuster case to rotate the worm together with the height adjustment shaft, drive the rack, adjust the protruding amount of the adjustment legs, and raise the attitude of household appliances such as projection devices up and down I try to adjust it.

  In the example of the tilt device of the projector shown in Patent Document 3, a foot support portion including a side rack gear and a grounding portion at the lower end, and a guide that movably stores the foot support portion and is suspended inside the projector main body. A first transmission part provided with a telescopic leg, a pinion gear screwed to the rack gear and a worm wheel screwed to the worm gear, and a transmission gear linked to the worm gear and worm gear shafts. A rotational drive force transmission unit comprising a second transmission unit, a drive motor connected to the shaft of the second transmission unit, a reception processing unit that receives an instruction signal and retrieves an instruction command, a drive motor, and a rotational drive By providing a force transmission unit and a control unit that controls the reception processing unit, the extension angle can be adjusted by extending the extension foot by forward rotation control of the drive motor and by contracting the extension foot by reverse rotation control. And so that it is leveling two telescopic legs by operating separately.

FIG. 11 is a perspective view showing a projector provided with a conventional projection height adjusting device, and FIG. 12 is a cross-sectional view showing the conventional projection height adjusting device.
As shown in FIGS. 11 and 12, the conventional projection height adjusting device lifts up the projector 1 and releases the screwing of the male screw projection height adjusting leg 2 and the female screw screw piece 4 with the lever 3. After the adjustment to the approximate position, the adjustment knob 7 of the projection height adjustment leg 2 is rotated to the left or right, and fine adjustment is performed upward or downward by the projection amount of the projection height adjustment leg 2.

In FIG. 11, the black arrow indicates the rotation direction of the adjustment knob 7, and the reference numeral 6 indicates the projection lens. In FIG. 12, reference numeral 5 denotes a case that supports the screw piece 4 so as to be rotatable, and reference numeral 8 denotes a leg base that supports the adjustment knob 7 so as to be rotatable.
11 and 12 is the unlocking direction of the lever 3, and indicates the direction in which the projected height adjustment leg 2 of the male screw and the screw piece 4 of the female screw are engaged.
JP 2002-241875 A JP 2006-106487 A JP 2003-5279 A

However, the conventional projection height adjusting device, when performing the fine adjustment of the projection amount of the projection height adjusting leg 2, rotates the counterclockwise or clockwise once and confirms the upward or downward adjustment direction before adjusting. After confirming the operation display or instruction manual displayed on the main body, the leg was rotated to adjust the protruding amount of the leg.
Also in the example shown in Patent Document 1, the rotation knob on the side of the image display device is rotated while viewing the projected image. Also in the example shown in Patent Document 2, the knob of an adjuster device such as a projection device is turned to the left or right. Therefore, it is necessary to check (make) the correspondence between the rotation direction and the vertical direction with a projection image or a manual.
Also, in the example shown in Patent Document 3, the light receiving window of the infrared remote control receiver is provided on the rear surface of the projector main body and adjusted with the remote control while looking at the projection screen from the rear of the projector main body. I need to confirm the move.

  The present invention has been made in view of such circumstances, and its object is to operate the adjustment knob in the same direction as the adjustment direction of the supported body to increase the height of the supported body. An object of the present invention is to provide a height adjusting device that can adjust the height of the supported body by operating the adjusting knob in the same direction as the direction in which the adjusting knob is to be adjusted.

  Further, another object of the present invention is that when the adjustment knob is rotated in the same direction as the adjustment direction of the supported body, the leg guide cylinder interlocked with the adjustment knob is rotated, and the supported body. To provide a height adjusting device capable of adjusting the amount of protrusion of the adjusting leg from the supported body in accordance with the operation of the adjusting knob by providing a configuration for moving the adjusting leg in the vertical direction with respect to is there.

  Another object of the present invention is to provide an adjustment direction of the supported body by providing a configuration in which a manual force is transmitted to the rotation shaft of the leg guide cylinder perpendicular to the rotation shaft of the adjustment knob by the bevel gear. Another object of the present invention is to provide a height adjusting device that can make the turning direction of the adjusting knob the same direction.

  Another object of the present invention is to operate the respective adjustment knobs in the same direction as the adjustment direction to be adjusted by providing the support body with a plurality of gear mechanisms for adjusting the protruding amount of the adjustment legs. An object of the present invention is to provide a height adjusting device that can perform the above-described operation.

  Another object of the present invention is to provide a structure in which one adjustment leg and a gear mechanism are provided on the supported body, thereby operating the adjustment knob in the same direction as the height adjustment direction. It is an object of the present invention to provide a height adjusting device that can determine the height of an object.

  Another object of the present invention is to provide a projection-type image display device that is provided with the height adjusting device of the present invention so that the height direction of projection and the operation direction of the adjusting knob can be made the same. It is to provide.

  The height adjustment device according to the present invention includes a screw-like adjustment leg that adjusts the height adjustment of the supported body by the amount of protrusion from the supported body, and the adjustment leg that is screwed to the adjustment leg. A height adjusting device including a screwing portion that protrudes from the body, and a gear mechanism that adjusts a protruding amount of the adjusting leg from the supported body, the gear mechanism being the same as the height adjustment. It has an adjustment knob operated in the adjustment direction.

  In the height adjustment device of the present invention having such a configuration, when the adjustment knob is operated in the adjustment direction to be adjusted, the gear mechanism supports the supported body in accordance with, for example, rotation of the adjustment knob operated in the same adjustment direction. Adjust the height of the supported body by adjusting the protruding amount of the adjusting leg from the top.

  In the height adjusting device of the present invention, the gear mechanism has a first gear provided on the adjusting knob and a second gear that is screwed with the first gear, and rotates. A leg guide tube having a polygonal cylindrical shape for guiding the guide member, and a slidable sliding portion fixed to one end of the adjustment leg and fitted into the leg guide tube.

  In the height adjusting device of the present invention having such a configuration, when the adjustment knob is rotated in the adjustment direction to be adjusted, the leg guide tube rotates in conjunction with the second gear screwed with the first gear of the adjustment knob. The sliding part is rotated in conjunction with the leg guide tube and the adjustment leg is rotated, and the adjustment leg is moved upward or downward by the screwing part, and the sliding part moves the leg guide cylinder upward or downward. The height of the supported body is adjusted by adjusting the amount of protrusion of the adjusting leg from the supported body.

  In the height adjusting device of the present invention, the first gear and the second gear are bevel gears.

  In the height adjusting device of the present invention having such a configuration, the first and second bevel gears transmit manual force from the supported body to the rotating shaft of the leg guide cylinder perpendicular to the rotating shaft of the adjusting knob. The amount of protrusion of the adjusting leg is adjusted so that the adjusting direction of the supported body is the same as the operating direction of the adjusting knob.

  In the height adjusting device of the present invention, the supported body includes a plurality of the gear mechanisms, and one gear mechanism is a gear mechanism having a reverse screw with respect to the other gear mechanism.

  In the height adjustment device of the present invention having such a configuration, the two adjustment mechanisms protruding from the supported body are operated by operating the respective adjustment knobs in the same direction as the adjustment direction to be adjusted by the both gear mechanisms of the supported body. Adjust the length.

  The height adjusting device of the present invention is characterized in that the adjusting leg and the gear mechanism are each provided on the supported body.

  In the height adjustment device of the present invention having such a configuration, the height of the adjustment leg protruding from the supported body is adjusted by operating the adjustment knob in the same direction as the adjustment direction to be adjusted. Adjust.

  In the projection display apparatus according to the present invention, the supported body includes a light source and a video display unit that reflects or transmits light from the light source. It is characterized by height adjustment.

  In the projection type image display apparatus of the present invention having such a configuration, the adjustment leg for adjusting the projection height moves upward or downward by rotating the adjustment knob in the projection direction to be adjusted, and the projection height is adjusted. adjust.

  Since the height adjustment device of the present invention is configured to adjust the height of the supported body by operating the adjustment knob in the same direction as the adjustment direction of the supported body, the height adjustment apparatus is adjusted in the direction in which the adjustment knob is to be adjusted. It has the effect that it can be operated and the height of a to-be-supported body can be adjusted.

  In the height adjustment device of the present invention, when the adjustment knob is rotated in the same direction as the adjustment direction of the supported body, the leg guide cylinder interlocked with the adjustment knob is rotated, so that Since the adjustment leg is moved in the vertical direction, the amount of protrusion of the adjustment leg from the supported body can be adjusted according to the operation of the adjustment knob.

  In the height adjustment device of the present invention, the manual force is transmitted to the pivot shaft of the leg guide cylinder perpendicular to the pivot shaft of the adjustment knob by the bevel gear, so that the supported body is operated according to the operation of the adjustment knob. The length of the adjustment leg protruding from the adjustment lever can be adjusted, and the adjustment direction of the supported body and the operation direction of the adjustment knob can be made the same direction.

  Since the height adjustment device of the present invention has a plurality of gear mechanisms for adjusting the protruding amount of the adjustment leg on the supported body, each adjustment knob can be operated in the same direction as the adjustment direction to be adjusted, This has the effect that the amount of protrusion of both adjusting legs from the supported body can be adjusted.

  Since the height adjusting device of the present invention is provided with one adjusting leg and one gear mechanism on the supported body, by operating the adjusting knob in the same direction as the height adjusting direction, The effect is that the height can be determined.

  Since the projection type image display apparatus of the present invention includes the height adjustment apparatus of the present invention, the projection height direction and the operation direction of the adjustment knob can be made the same.

Hereinafter, preferred embodiments of a height adjusting device according to the present invention will be described with reference to the drawings.
(Embodiment 1)
A projection type video display device provided with a height adjusting device according to the present invention will be described as an example.
FIG. 1 is a perspective view showing a projection-type image display device including a height adjusting device according to Embodiment 1 of the present invention. FIG. 2 is a plan view showing the top surface of the projection display apparatus according to Embodiment 1 of the present invention.

The height adjusting device 30 according to the first embodiment is provided in a projection type video display device 14 (supported body) having a substantially rectangular casing 12, and the projection lens 16 of the projection type video display device 14 is provided. Adjustable legs 17 and 18 for adjusting the projection height provided at two positions on both front corners, bases 20 and 20 for supporting the adjustable legs 17 and 18, and the bases 20 and 20 can be rotated. And the levers 42 and 42 for releasing the adjustment legs 17 and 18 and the adjustment knob 24 for rotating the one adjustment leg 18 in the same direction as the projection direction for adjustment. is doing.
In FIG. 1, reference numeral 13 denotes an opening that exposes a part of the adjustment knob 24, and a white arrow indicates that the lever 42 releases the fixing of the adjustment leg 18 (screwing with a screw piece 32 described later). The black arrow indicates the direction of rotation of the adjustment knob 24.

FIG. 3 is a perspective view showing the screw piece mechanism according to the first embodiment. FIG. 4 is a block diagram showing the height adjusting apparatus according to Embodiment 1 of the present invention. 5 is a cross-sectional view taken along line AA shown in FIG. 6 is a cross-sectional view taken along line BB shown in FIG.
As shown in FIGS. 4 to 6, the height adjusting device 30 includes a screw piece mechanism 40 that is a screwing portion that is screwed into or released from the adjusting leg 18 that is a movable male screw, and the adjusting leg 18. And a gear mechanism 60 for rotating the motor.
In FIG. 4, dotted arrows indicate the assembly direction of the parts.

As shown in FIG. 3, the screw piece mechanism 40 includes a screw piece 32 of a female screw that is screwed to the adjustment leg 18 that is a movable male screw, and a lever 42 that releases the screw piece 32 and the adjustment leg 18. And a case 48 for housing the screw piece 32 and the lever 42.
The screw piece 32 includes an engagement portion 38 and a projection 37 on the end surface of 32, and arms 36 and 36 are provided on both sides, and pins 39 and 39 are provided on the side end surfaces of the arms 36 and 36, respectively. Projected. The screw piece 32 is pivotally supported on the case 48 by the pins 39 and 39.

  The lever 42 has both levers 44, 44 extending toward the screw piece 32, and is pivotally supported on the case 48 by pins 46, 46 protruding from the bases of the levers 44, 44. Both levers 44 and 44 are engageable with the engaging portions 38 and 38 of the screw piece 32.

  In such a screw piece mechanism 40, when the lever 42 is pushed up and rotated, both levers 44, 44 of the lever 42 engage with the engaging portion 38 of the inclined screw piece 32, and the screw piece 32 and the adjustment leg 18 are engaged. The screwing is released (see FIG. 7). When the stress on the lever 42 is released, the screw piece 32 is pushed back by the lever 45 projecting from the case 48, the screw piece 32 is screwed into the adjustment leg 18, and the lever 42 is pushed back horizontally ( (See FIG. 5).

  The case 48 has through holes 49 that allow the adjustment legs 18 to pass through on both sides, and the case 48 is fitted to a case fitting portion 52 provided at a corner of the casing 12 of the projection display apparatus 14. It is possible. When the case 48 is fitted to the case fitting portion 52, the pawls 47, 47 elastically formed on both sides of the case 48 are hooked holes 54 formed on both sides of the case fitting portion 52, The case 48 is fixed to the case fitting portion 52 so as to fit into the case 54.

As shown in FIG. 3, the adjustment leg 18 has a structure erected on the base 20, and the head 19 of the adjustment leg 18 has a polygonal shape, and a polygonal shaft 62 (a nut-like fixture described later) 4), the head 19 of the adjusting leg 18 is screwed into the fixing male screw 64 in a state where the polygon shaft 62 is fitted. (See FIG. 5).
As shown in FIG. 4, the case fitting portion 52 has a fitting portion 58 on the top surface that protrudes annularly along the edge of the through hole 56 through which the adjustment leg 18 passes.

As shown in FIGS. 4 to 6, the gear mechanism 60 is a nut-like fixture that is fixed to the head portion 19 of the adjustment leg 18 that can enter and exit from the through hole 56 of the case fitting portion 52 with a fixing male screw 64. A disk-like shape having a polygonal shaft 62, a polygonal cylindrical leg guide 66 (leg guide tube) for guiding the adjusting leg 18 through the polygonal shaft 62, and a bevel gear 68 of the first gear at the center. An adjustment knob 24 is provided, and a bevel gear 67 of a second gear that is screwed with the bevel gear 68 of the adjustment knob 24 is provided at the peripheral end portion of the leg guide 66.
The adjustment knob 24 is partially exposed from the opening 13 provided in the housing 12 and can be operated from the outside of the housing 12 (see FIGS. 1 and 4).

The gear mechanism 60 is housed in a gear case 73, and the gear case 73 is fixed to the housing 12 with screws 74 (see FIGS. 4 and 6). The rotating shaft 71 of the adjusting knob 24 is pivotally supported by the gear case 73 (see FIG. 6).
A cylindrical fitting portion 58 projecting along the edge of the through hole 56 of the case fitting portion 52 is slidably fitted into the cylindrical shaft hole 65 of the bevel gear 67, and the case fitting portion 52. Slidably supports the cylindrical portion 69 of the bevel gear 67 of the leg guide 66 (see FIGS. 5 and 6).

In the first embodiment, the shape of the hole of the leg guide 66 is formed in a similar shape corresponding to the plan view of the polygonal shaft 62 (see FIG. 4). The guide 66 is latched against the rotation.
Therefore, the polygon shaft 62 can slide only in the guide direction of the leg guide 66.
In the first embodiment, the polygon shaft 62 is a regular hexagonal prism.

In the gear mechanism 60 having such a configuration, when the adjusting knob 24 is rotated, the bevel gear 68 is rotated, the screwed bevel gear 67 is rotated, the leg guide 66 is rotated, and the rotation of the leg guide 66 is interlocked. Then, the polygon shaft 62 rotates. The adjustment leg 18 is rotated by the rotation of the polygon shaft 62.
Therefore, the gear mechanism 60 according to the first embodiment can transmit the driving force between the two orthogonal axes of the adjustment knob 24 and the leg guide 66.

Next, the operation of the height adjustment apparatus according to Embodiment 1 will be described.
7 and 8 are schematic cross-sectional views showing a state where the adjusting leg and the screw piece according to the first embodiment are disengaged.
In the height adjusting device 30 according to the first embodiment, first, when the projection-type image display device 14 is lifted and the lever 42 is pushed up around the rotation axis, both levers 44 and 44 of the lever 42 are lowered downward. The levers 44, 44 push the engaging portions 38, 38, rotate around the pin 39 pivotally supported by the case 48, the adjustment leg 18 and the screw piece 32 are disengaged, and the adjustment leg 18 is fixed. Release (see FIG. 3, FIG. 7 or FIG. 8).

Next, when the base 20 of the adjustment leg 18 is operated and the adjustment leg 18 is taken in and out of the housing 12, the polygonal shaft 62 slides in the leg guide 66 and stops at the approximate height. 18 is adjusted (see H shown in FIG. 8).
Next, when the stress on the lever 42 is released, the screw piece 32 is pushed back by the lever 45 protruding from the case 48, the screw piece 32 is screwed onto the adjusting leg 18, and the lever 42 is pushed back horizontally ( (See FIGS. 3 and 5).

Then, if the projection direction in which the adjustment leg 18 is to be adjusted is upward, the adjustment knob 24 is rotated upward, and if the projection direction is downward, the adjustment knob 24 is rotated downward (see FIG. 1).
At this time, when the adjusting knob 24 is rotated upward, the bevel gear 68 is rotated, the screwed bevel gear 67 is rotated clockwise, the leg guide 66 is rotated clockwise, and the leg guide 66 is rotated clockwise. The polygon shaft 62 rotates clockwise in conjunction with the rotation of. The adjustment leg 18 is rotated clockwise by the clockwise rotation of the polygon shaft 62, and the adjustment leg 18 is extended with respect to the housing 12 by screwing with the screw piece 32, and the height is increased (see FIG. 6). reference).

  Further, when the adjustment knob 24 is rotated downward, the bevel gear 68 is rotated, the screwed bevel gear 67 is rotated counterclockwise, the leg guide 66 is rotated counterclockwise, and the leg guide 66 is rotated counterclockwise. In conjunction with the rotation, the polygon shaft 62 rotates counterclockwise. The adjustment leg 18 is rotated counterclockwise by the counterclockwise rotation of the polygon shaft 62, and the adjustment leg 18 is contracted with respect to the housing 12 by screwing with the screw piece 32, and the height is lowered (see FIG. 6). reference).

  Therefore, the height adjusting device 30 according to the first embodiment can make the projection height direction and the rotation direction of the adjusting knob 24 the same, that is, the operation direction can be made the same.

  In the first embodiment, the adjustment legs 17 and 18 are provided at two positions. However, the adjustment knob 24 is provided only on the right side toward the projection type image display device 14 (see FIG. 1). When the knob 24 is arranged symmetrically with respect to the projection type image display device 14, that is, when the knob for adjustment is also provided on the other adjusting leg 17, the adjusting leg 17 and the screw piece 32 (see FIGS. 4 and 5). ) May be reversed and the gear case 73 accommodating the gear mechanism 60 may be symmetrical.

(Embodiment 2)
In Embodiment 1 described above, one adjustment leg is provided at each of the front corners of the housing. However, one adjustment leg may be provided at the center of the front side of the projection display apparatus.
FIG. 9 is a perspective view showing a projection-type image display device including the height adjustment device according to the second embodiment.
In the second embodiment, the adjusting leg 18 is provided at the approximate center of the projection display apparatus 14, and the screw piece mechanism 40 and the gear mechanism 60 are substantially the same as those in the first embodiment described above. The adjusting leg 18, the screw piece 32, and the bevel gears 67 and 68 of the gear mechanism 60 are reverse screws, and the gear case 73 has a symmetrical shape.
In FIG. 9, the black arrow indicates the rotation direction of the adjustment knob 24.

  In the second embodiment having such a configuration, by rotating the adjustment knob 24 in the projection height direction to be adjusted, the leg guide 66 having a polygonal hole is rotated in conjunction with the bevel gears 67 and 68. The polygon shaft 62 fixed to the adjustment leg 18 that adjusts the projection height by the fixing male screw 64 rotates, and the adjustment leg 18 that adjusts the projection height moves upward or downward to project the projection height. Tweak the.

  Therefore, the height adjustment apparatus according to the second embodiment can make the projection height adjustment direction and the rotation direction of the adjustment knob 24 the same, that is, the operation direction can be made the same.

  In the first embodiment and the second embodiment, the projection-type image display device is described as an example of the electronic device including the height adjustment device. However, the present invention is not limited to this, and for example, a measurement device having an XY stage can also be used. Good.

(Embodiment 3)
FIG. 10 is a schematic diagram showing a projection-type image display device including the height adjusting device according to the third embodiment of the present invention.
The projection-type image display device 80 includes the height adjusting device 30 of the present invention, a high-intensity discharge lamp 86 having a structure in which a lamp bulb 82 is attached to a reflecting mirror 84, and a color wheel unit 88 that emits light from the high-intensity discharge lamp 86. A condenser lens 90 for condensing light, a rod lens 92 for uniforming the illuminance distribution of each monochromatic light that has passed through the color wheel portion 88 divided into the three primary colors of RGB, a relay lens portion 94 for transmitting a real image as it is, A reflection-type image display element 96 (image display unit) that generates a monochrome image in synchronism with monochromatic light and expresses time-division full color, and a projection lens 16 are provided.
In FIG. 10, reference numeral 98 denotes a power source.

  In such a projection-type image display device 80, the white light emitted from the lamp bulb 82 is transmitted through the color filter on the color wheel portion 88 by the condenser lens 90 to improve the quality on the screen. The light is condensed on the lens 92. The light that has passed through the rod lens 92 and the relay lens portion 94 is selectively reflected by the video display element 96 according to the video signal. The projection lens 16 images this reflected light on a screen and displays an image.

In the third embodiment having such a configuration, by rotating the adjustment knob 24 in the projection direction to be adjusted, the adjustment leg 18 for adjusting the projection height moves upward or downward, and finely adjusts the projection height. To do.
Therefore, the projection-type image display device 80 including the height adjustment device 30 according to the third embodiment can make the projection height adjustment direction and the rotation direction of the adjustment knob 24 the same.

In the third embodiment, the projection type video display device having the color wheel unit is taken as an example of the video display device provided with the height adjusting device of the present invention. However, the present invention is not limited to this. In addition, a liquid crystal projector of a type that obtains a large screen by transmitting through a liquid crystal display panel (video display unit) that combines a liquid crystal shutter and three primary color filters and projecting it may be used.
Moreover, although the high intensity | strength discharge lamp was mentioned as an example as a light source, LED may be used as a light source.

It is a perspective view which shows a projection type video display apparatus provided with the height adjustment apparatus which concerns on Embodiment 1 by this invention. It is a top view which shows the upper surface of the projection type video display apparatus concerning Embodiment 1 by this invention. 3 is a perspective view showing a screw piece mechanism according to Embodiment 1. FIG. It is a block diagram which shows the height adjustment apparatus which concerns on Embodiment 1 by this invention. It is AA sectional drawing shown in FIG. It is BB sectional drawing shown in FIG. It is a schematic sectional drawing which shows the state which the adjustment leg and screw piece which concern on Embodiment 1 have released the screwing. It is a schematic sectional drawing which shows the state which the adjustment leg and screw piece which concern on Embodiment 1 have released the screwing. It is a perspective view which shows a projection type video display apparatus provided with the height adjustment apparatus which concerns on Embodiment 2. FIG. It is the schematic which shows a projection type video display apparatus provided with the height adjustment apparatus of this invention which concerns on Embodiment 3. FIG. It is a perspective view which shows the projector provided with the conventional projection height adjustment apparatus. It is sectional drawing which shows the conventional projection height adjustment apparatus.

Explanation of symbols

14 Projection-type image display device (supported body)
18 Adjustment leg 24 Adjustment knob 30 Height adjustment device 40 Screw piece mechanism (screwing part)
60 Gear mechanism 66 Leg guide (leg guide tube)
67 Bevel gear (second gear)
68 Bevel gear (first gear)
96 Video display element (video display unit)

Claims (6)

A screw-like adjustment leg that adjusts the height adjustment of the supported body by the amount of protrusion from the supported body, and a screwing portion that is screwed to the adjustment leg and causes the adjustment leg to protrude from the supported body. In the height adjustment device provided,
A gear mechanism for adjusting the amount of protrusion of the adjustment leg from the supported body;
The gear mechanism includes an adjustment knob that operates in the same adjustment direction as the height adjustment. The gear mechanism is
A first gear provided on the adjustment knob;
A polygonal cylindrical leg guide tube that rotates with a second gear threadably engaged with the first gear and guides the adjustment leg;
The height adjusting device according to claim 1, further comprising a slidable sliding portion that is fixed to one end of the adjusting leg and is fitted into the leg guide tube.   The height adjusting device according to claim 2, wherein the first gear and the second gear are bevel gears. The supported body has a plurality of the gear mechanisms;
4. The height adjusting device according to claim 1, wherein one gear mechanism is a reverse screw gear mechanism with respect to the other gear mechanism.   The height adjusting device according to any one of claims 1 to 3, wherein each of the adjusting leg and the gear mechanism is provided on the supported body. The supported body is a housing having a light source and an image display unit that reflects or transmits light from the light source,
A projection-type image display device, wherein the height of the housing is adjusted by the height adjusting device according to any one of claims 1 to 5.

Images