JP7066337B2 - Projection type display device - Google Patents

Description

The present invention relates to a projection type display device in which a projection lens can be attached and detached by operating a lever.

Conventionally, in flight simulators and the like, it has been required that a projection type display device such as a projector projects accurately while receiving disturbance such as vibration. For this reason, in a projection type display device in which a projection lens is detachably attached, a lever-type attachment structure is often adopted with a spigot mount. Further, the projection type display device is provided with a shift unit provided with a motor for driving the projection lens so as to shift the projection lens in a direction orthogonal to the optical axis.

Patent Document 1 discloses a projection type display device in which the front cover of the projection lens can be removed and the projection lens can be replaced.

Japanese Unexamined Patent Publication No. 2004-205672

However, when the projection type display device disclosed in Patent Document 1 adopts a structure in which the lever is rotated to replace the projection lens, the projection type display device becomes large in size in order to avoid interference between the lever and the motor. ..

Therefore, an object of the present invention is to provide a smaller projection type display device in which the projection lens can be exchanged by using a lever.

The projection type display device as one aspect of the present invention is a projection type display device capable of exchanging a projection lens, and has a moving portion for moving the projection lens in a direction orthogonal to the optical axis and the moving portion. The handle member for replacing the projection lens has a drive unit for driving the moving portion and a fixing member for fixing the moving portion, and the handle member for replacing the projection lens is on the opposite side of the drive portion with respect to the surface including the optical axis. The handle member is arranged on the same side as the fixing member with respect to the surface including the optical axis .
Other objects and features of the present invention will be described in the following examples.

According to the present invention, it is possible to provide a smaller projection type display device in which the projection lens can be exchanged by using a lever.

It is an internal block diagram of the projection type display device in Example 1. FIG. It is a perspective view of the projection lens unit and the shift unit in Example 1. FIG. It is a top view of the projection lens unit and the shift unit in Example 1. FIG. It is a schematic diagram which shows the effect about the position of the screw for fixing a shift unit in Example 1. FIG. It is external perspective view of the projection type display device in Example 2. FIG. It is a front view of the projection type display device in Example 2. FIG. It is a perspective view of the front cover in Example 2. FIG. It is a figure which shows the state which removed the front cover of the projection type display device in Example 2. FIG. It is sectional drawing which shows the state which the projection lens unit and the front cover of the projection type display device in Example 2 are attached. It is a block diagram of the control system of the projection type display device in Example 3. FIG. It is a flowchart which shows the protection operation of the projection type display device in Example 3. FIG.

Hereinafter, examples of the present invention will be described in detail with reference to the drawings.

First, the projection type display device (projector) according to the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is an internal configuration diagram of the projection type display device 100 in this embodiment.

In FIG. 1, the projection type display device 100 is configured so that the projection lens unit (projection lens) 5 can be replaced. Reference numeral 1 is a lamp used as a light source. Reference numeral 2 is a lamp holder for holding the lamp 1 and the explosion-proof convex lens 3 described later. Reference numeral 3 is an explosion-proof convex lens having a function of condensing the light from the lamp 1. Reference numeral 4 is a lamp unit composed of a lamp 1, a lamp holder 2, and an explosion-proof convex lens 3. α is an illumination optical system that incidents the light from the lamp 1. β is a color-separated synthetic optical system including liquid crystal panels for three colors of R, G, and B that incident light emitted from the illumination optical system α. Reference numeral 5 denotes a projection lens unit (lens device) that incidents light emitted from the color-separated synthetic optical system β and projects an image on a screen (projected surface) (not shown). The projection lens unit 5 houses a projection lens (projection optical system) inside the projection lens unit 5. Reference numeral 6 is a shift unit (moving unit) for moving the projection lens unit 5 in a direction orthogonal to the optical axis OA.

Reference numeral 7 is an optical box that houses the lamp unit 4, the illumination optical system α, and the color separation / synthesis optical system β, and to which the shift unit 6 is fixed. Reference numeral 8 is a power source, which supplies power to each part of the projection type display device 100. Reference numeral 9 is a ballast, which is a lighting power supply device for lighting the lamp 1. The ballast 9 is electrically connected to the power source 8 and the lamp 1.

Reference numeral 10 is a cooling fan (first cooling unit) for cooling the optical element of the color separation synthesis system β by the exhaust of air sucked in from the intake port 18a provided in the outer case 101, which will be described later. Reference numeral 11 is a cooling fan (second cooling unit) that cools the optical element of the color separation synthesis system β by the exhaust of the air sucked in from the intake port 18a provided in the outer case 101, which will be described later. Reference numeral 12 is an intake duct that holds the cooling fans 10 and 11 and sucks outside air from the intake ports 18a described later and guides the air to the respective intake ports of the cooling fans 10 and 11. Reference numeral 13 is an exhaust duct for blowing the air exhausted by the cooling fans 10 and 11 to the color separation synthesis system β. Reference numeral 14 is an exhaust fan. The power source 8 and the ballast 9 are cooled by the air taken in by the exhaust fan 14, the lamp 1 and its surroundings are cooled by the exhaust, and heat is exhausted to the outside of the housing from the exhaust port 18b described later. Reference numeral 15 is an exhaust fan holder for holding the exhaust fan 14. Reference numeral 16 is a cooling fan for cooling the lamp 1. The cooling fan 16 takes in air that has cooled the optical element of the color separation synthesis system β, and cools the lamp 1 by exhaust gas. Reference numeral 17 is a cooling duct for guiding the air exhausted from the cooling fan 16.

Reference numeral 101 denotes an exterior lower case, which includes a front intake port 18a and a side intake port 18b for taking in outside air inside the housing of the projection type display device 100, and an exhaust port 18c for exhausting heat to the outside of the housing. Reference numeral 19 denotes an air filter that is attached close to the intake port 18a and suppresses dust from entering the housing when the outside air is sucked into the housing.

20 is equipped with a connector (interface) that captures various signals such as image signals and control signals, and is mainly driven by a liquid crystal panel, a lighting command to a lamp 1, and a plurality of fans by the electric power from the power source 8 described above. It is a drive / control board unit for sending the drive command of. The drive / control board unit 20 is electrically connected to a liquid crystal panel arranged in the color separation / synthesis optical system β via an FPC (flexible printed circuit board).

Next, with reference to FIG. 2, the structures of the projection lens unit 5 and the shift unit 6 of the projection type display device 100 in this embodiment will be described. FIG. 2 is a perspective view of the projection lens unit 5 and the shift unit 6, showing a state in which the projection lens unit 5 is mounted on the shift unit 6.

Reference numeral 51 denotes a lever (handle member) for attaching / detaching the projection lens unit 5 from the shift unit 6, and is provided in the projection type display device 100. Reference numeral 51a is a handle portion for allowing both ends of the lever 51 to be bent and raised so that the lever 51 can be gripped. Reference numeral 61 denotes a motor (driving unit) that is a driving source for moving (driving) the shift unit 6 in the horizontal direction (left-right direction). Reference numeral 62 is a gear unit for transmitting power to the motor 61. Reference numeral 63 denotes a motor (driving unit) that is a driving source for moving (driving) the shift unit 6 in the vertical direction (vertical direction). Reference numeral 64 is a gear unit for transmitting power to the motor 63. Reference numeral 65 denotes a horizontal fixing plate for fixing the shift unit 6 in the horizontal direction in order to suppress the influence of disturbance and the like. Reference numeral 66 denotes a vertical fixing plate for fixing the shift unit 6 in the vertical direction in order to suppress the influence of disturbance and the like. Reference numeral 67 denotes a screw (fixing member) for fixing the horizontal fixing plate 65 and the vertical fixing plate 66, respectively. By fixing the screw 67 to the horizontal fixing plate 65 and the vertical fixing plate 66 in this way, the shift unit 6 is fixed so as not to move.

Next, the positional relationship between the lever 51 and the motor 61 will be described with reference to FIG. FIG. 3 is a plan view of the projection lens unit 5 and the shift unit 6, and shows the positional relationship between the lever 51 and the motor 61. Reference numeral 68 is a horizontally movable plate that holds the projection lens unit 5 and shifts in the horizontal direction. Reference numeral 69 denotes a rotation axis that shifts the horizontally movable plate 68 in the horizontal direction by the rotation of the gear unit 62. Since the horizontally movable plate 68 is attached via the rotating shaft 69, it can be shifted by driving the motor 61. Also in the vertical direction, the vertically movable plate (not shown) can operate and shift in the same manner as in the horizontal direction.

As shown in FIGS. 2 and 3, the lever 51 is arranged on the opposite side of the motors 61 and 63 with respect to the surface PL (the vertical line orthogonal to the optical axis OA) including the optical axis OA. Preferably, the lever 51 can be attached to and detached from the projection lens unit 5 with respect to the projection type display device 100 by rotating the lever 51 in a predetermined range RG between the positions P1 and P2. That is, when the lever 51 is at the position P1, the projection lens unit 5 is attached to the projection type display device 100, and the projection lens unit 5 is fixed to the projection type display device 100 by rotating the lever 51 from the position P1 to the position P2. can do. At this time, the lever 51 is provided on the opposite side of the motors 61 and 63 with respect to the surface PL including the optical axis OA in the entire predetermined range RG. Further, preferably, the lever 51 is arranged on the same side as the screw 67 (horizontal fixing plate 65 and vertical fixing plate 66) with respect to the surface PL including the optical axis OA. Further preferably, the screw 67 (horizontal fixing plate 65 and vertical fixing plate 66) is arranged on the opposite side of the motors 61 and 63 with respect to the surface PL including the optical axis OA.

Next, with reference to FIG. 4, the effect of the position of the screw 67 for fixing the shift unit 6 will be described. FIG. 4 is a schematic diagram showing the effect on the position of the screw 67 for fixing the shift unit 6. FIG. 4A shows a state (comparative example) in which the shift unit 6 is fixed at a position close to the motor 61 and the gear unit 62. At this time, the distance from the gear unit 62 to the screw 67 is L1, and the force required for fixing is F1. On the other hand, FIG. 4B shows a state in which the shift unit 6 is fixed at a position far from the motor 61 and the gear unit 62 (this embodiment). At this time, the distance from the gear unit 62 to the screw 67 is L2, and the force required for fixing is F2. In FIGS. 4A and 4B, the broken line indicates the drive region AR of the projection lens unit 5.

When the torque required for fixing is T, the relationship of T = L1 × F1 = L2 × F2 and L1 <L2 is established, so that the relationship of F2 <F1 is derived.

If the projection lens unit 5 is sandwiched and the side facing the motors 61 and 63 is not locked, the projection lens unit 5 needs to be fixed with an excessive force. Further, when the vicinity of the projection lens unit 5 is not locked, the friction at the time of locking cannot win against the moment when the projection lens unit 5 tries to rotate, so that the projection lens unit 5 rotates. Therefore, a fixing mechanism for the lever 51 and the shift unit 6 is provided on the opposite side of the motors 61 and 63 via the projection lens unit 5. As a result, the shift unit 6 can be fixed without requiring excessive force, and the projection type display device 100 can be miniaturized. Therefore, according to the present embodiment, it is possible to provide a miniaturized projection type display device in which the projection lens can be exchanged by using a lever. In addition, it is possible to achieve both lever operation and shift lock ease.

Next, the projection type display device according to the second embodiment of the present invention will be described. First, the appearance configuration of the projection type display device 100 in this embodiment will be described with reference to FIGS. 5 and 6. FIG. 5 is an external perspective view of the projection type display device 100. FIG. 6 is a front view of the projection type display device 100 and shows a state in which the shift lock screw cover 106 is removed.

In FIG. 5, 101 is an exterior lower case that protects the inner lower side of the projection type display device 100. Reference numeral 102 is an exterior case that protects the inner upper side of the projection type display device. Reference numeral 5 is a projection lens unit (a lens device that can be detachably attached to the projection type display device 100) that can be replaced by a user. The projection lens unit 5 performs magnified projection on a screen (not shown). Reference numeral 6 denotes a shift unit for moving the projection lens unit 5 horizontally and perpendicularly to the direction along the optical axis OA (optical axis direction). Reference numeral 105 is a front cover (cover member) for hiding the inside of the projection type display device 100 when viewed from the front side of the projection type display device 100. The front cover 105 is removable for replacement of the projection lens unit 5. The front cover 105 has a U-shape so as to avoid the projected image by the projection lens unit 5. Reference numeral 106 is a shift lock screw cover for hiding the screw that suppresses the movement of the shift unit 6 (performs a shift lock that fixes the shift unit).

As shown in FIG. 6, when the shift lock screw cover 106 is removed from the projection type display device 100, the screw (shift lock screw) 67 for suppressing the movement of the shift unit 6 is exposed. In this embodiment, the movement of the shift unit 6 is allowed by removing the screw 67, while the movement of the shift unit 6 is suppressed by fastening the screw 67.

Next, the structure of the front cover 105 will be described with reference to FIG. 7. FIG. 7 is a perspective view of the front cover 105. The front cover 105 is provided with two mounting portions 105a for mounting on the outer upper case 102 and two mounting portions 105b for mounting on the outer lower case 101. Further, the front cover 105 is provided with a tubular guide portion 105c for inserting the screw 67. In order to maintain the rigidity of the guide portion 105c, ribs (projections) 105d are provided radially on the outer peripheral portion of the guide portion 105c.

Next, a state in which the front cover 105 is removed from the projection type display device 100 will be described with reference to FIG. FIG. 8 is a diagram showing a state in which the front cover 105 of the projection type display device 100 is removed. By removing the front cover 105 from the projection type display device 100, the lever (handle) 51 for attaching and detaching the projection lens unit 5 is exposed when the projection lens unit 5 is replaced. Reference numeral 51a is a handle portion (handle portion) for the user to grip the lever 51. A female screw is cut on the side where the lever 51 is provided, and a male screw is cut on the projection lens unit 5 side. Therefore, the projection lens unit 5 is removed by rotating the lever 51 counterclockwise from the locked state of the projection lens unit 5. On the other hand, when the lever 51 is attached, the projection lens unit 5 can be fixed by rotating it clockwise. In this embodiment, the projection lens unit 5 and the shift unit 6 have a structure as shown in FIG. 2, similarly to the first embodiment.

Next, with reference to FIG. 9, a state in which the projection lens unit 5 and the front cover 105 are attached to the projection type display device 100 will be described. FIG. 9 is a cross-sectional view showing a state in which the projection lens unit 5 and the front cover 105 are attached. The rib 105d provided on the guide portion 105c comes into contact with the handle portion 51a of the lever 51. That is, the rib 105d abuts on the lever 51 so as to restrict the movement (rotation) of the lever 51. As a result, the movement of the lever 51 in the loosening direction is suppressed against disturbances such as vibration. Therefore, even when a disturbance such as vibration occurs, the lever 51 does not rotate significantly in the counterclockwise direction, so that the projection lens unit 5 can be reliably fixed for projection. Therefore, according to the present embodiment, it is possible to provide a projection type display device in which the interchangeable lens is prevented from loosening.

Next, the projection type display device according to the third embodiment of the present invention will be described with reference to FIGS. 10 and 11. FIG. 10 is a block diagram of the control system of the projection type display device 100 in this embodiment. FIG. 11 is a flowchart showing the protection operation of the projection type display device 100. Each step in FIG. 11 is mainly performed by the control unit 204 of the projection type display device 100.

In FIG. 10, 201 is a light source. 202 is a light source lighting power source for lighting the light source 201. Reference numeral 203 is a control board. The control board 203 has a control unit 204 for controlling the light source lighting power supply 202. Reference numeral 205 is a detection switch (detection unit) for detecting that the front cover 105 of the projection type display device 100 is attached.

First, in step S1 of FIG. 11, the control unit 204 determines whether or not the front cover 105 is attached based on the detection signal of the detection switch 205. If the front cover 105 is not attached, the process proceeds to step S2. In step S2, the control unit 204 warns the user to attach the front cover 105 with a display, a sound, or the like, and returns to step S1. On the other hand, if the front cover 105 is attached in step S1, the process proceeds to step S3. In step S3, the control unit 204 outputs a signal to the light source lighting power supply 202 so as to perform an ON operation. The light source 201 is turned on with the ON operation of the light source lighting power supply 202. In this way, the control unit 204 controls the on / off of the light source lighting power supply 202 based on the signal from the detection switch 205.
By such a series of operations, when the front cover 105 is not attached to the projection type display device 100, the light source 201 is set not to be turned on. On the other hand, since the front cover 105 is attached while the light source 201 is lit, it is possible to reliably prevent the lever 51 from loosening and to perform safe lighting. According to this embodiment, it is possible to provide a projection type display device that prevents loosening of a projection lens that is detachably attached.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and modifications can be made within the scope of the gist thereof.

6 Shift unit (moving part)
51 Lever (handle member)
61, 63 motor (drive unit)
100 projection type display device

Claims (5)

It is a projection type display device that can replace the projection lens.
A moving unit that moves the projection lens in a direction orthogonal to the optical axis,
The drive unit that drives the moving unit and
It has a fixing member for fixing the moving portion, and has.
The handle member for replacing the projection lens is arranged on the opposite side of the drive unit with respect to the surface including the optical axis.
The projection type display device, wherein the handle member is arranged on the same side as the fixing member with respect to a surface including the optical axis. The projection-type display device according to claim 1 , wherein the handle member is arranged on the opposite side of the drive unit with respect to a vertical line of the projection-type display device including the optical axis. The projection type display device according to claim 1 or 2, wherein the fixing member is arranged on the opposite side of the drive unit with respect to a surface including the optical axis. It also has a removable cover member for the replacement of the projection lens.
The cover member has a protrusion and has a protrusion.
The projection type display device according to any one of claims 1 to 3 , wherein the protrusion of the cover member is in contact with the handle member so as to restrict the movement of the handle member. A detection unit that detects that the cover member is attached, and
The projection type display device according to any one of claims 1 to 4 , further comprising a control unit that controls on / off of a power source for lighting a light source based on a signal from the detection unit. ..

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