JP2018205471A - Projection display - Google Patents

Abstract

The present invention provides a miniaturized projection display device in which a projection lens can be replaced using a lever.
A projection display device (100) in which a projection lens (5) can be exchanged, a moving unit (6) for moving the projection lens in a direction perpendicular to the optical axis (OA), and a movement The handle member (51) for exchanging the projection lens is disposed on the opposite side of the drive unit with respect to the plane including the optical axis.
[Selection] Figure 3

Description

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

  Conventionally, in a flight simulator or the like, a projection display device such as a projector is required to accurately project 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 employed with a spigot mount. Further, the projection display device is provided with a shift unit including a motor that drives the projection lens to shift in a direction orthogonal to the optical axis.

  Patent Document 1 discloses a projection display device that can replace the projection lens by removing the front cover of the projection lens.

JP 2004-205672 A

  However, when adopting a structure in which the projection lens is replaced by rotating the lever in the projection display device disclosed in Patent Document 1, the projection display device is enlarged in order to avoid interference between the lever and the motor. .

  SUMMARY OF THE INVENTION An object of the present invention is to provide a projection display apparatus that can exchange a projection lens by using a lever and that is smaller.

A projection display device according to an aspect of the present invention is a projection display device capable of exchanging a projection lens, the moving unit moving the projection lens in a direction orthogonal to the optical axis, and the moving unit And a handle member for exchanging the projection lens is disposed on the opposite side of the drive unit with respect to the surface including the optical axis. This will be explained in the following examples.

  ADVANTAGE OF THE INVENTION According to this invention, a projection lens can be replaced | exchanged using a lever, and a smaller projection type display apparatus can be provided.

1 is an internal configuration diagram of a projection display device in Embodiment 1. FIG. 3 is a perspective view of a projection lens unit and a shift unit in Embodiment 1. FIG. 2 is a plan view of a projection lens unit and a shift unit in Embodiment 1. FIG. It is a schematic diagram which shows the effect regarding the position of the screw for fixing the shift unit in Example 1. FIG. FIG. 6 is an external perspective view of a projection display device according to a second embodiment. 6 is a front view of a projection display device according to Embodiment 2. FIG. 6 is a perspective view of a front cover in Embodiment 2. FIG. It is a figure which shows the state which removed the front cover of the projection type display apparatus in Example 2. FIG. It is sectional drawing which shows the state in which the projection lens unit and front cover of the projection type display apparatus in Example 2 were attached. FIG. 9 is a block diagram of a control system of a projection display device in Embodiment 3. 10 is a flowchart illustrating a protection operation of the projection display device according to the third embodiment.

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

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

  In FIG. 1, the projection display device 100 is configured to be able to replace a projection lens unit (projection lens) 5. Reference numeral 1 denotes a lamp used as a light source. A lamp holder 2 holds the lamp 1 and an explosion-proof convex lens 3 described later. Reference numeral 3 denotes an explosion-proof convex lens having a function of condensing light from the lamp 1. A lamp unit 4 includes a lamp 1, a lamp holder 2, and an explosion-proof convex lens 3. α is an illumination optical system that receives light from the lamp 1. β is a color separation / combination optical system including a liquid crystal panel for three colors R, G, and B on which light emitted from the illumination optical system α is incident. Reference numeral 5 denotes a projection lens unit (lens device) that receives outgoing light from the color separation / synthesis 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) therein. Reference numeral 6 denotes a shift unit (moving unit) that moves the projection lens unit 5 in a direction orthogonal to the optical axis OA.

  Reference numeral 7 denotes 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. A power source 8 supplies power to each unit of the projection display device 100. A ballast 9 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 denotes a cooling fan (first cooling unit) that cools the optical element of the color separation / synthesis system β by exhausting air that has taken in outside air from an intake port 18a provided in an exterior lower case 101 described later. Reference numeral 11 denotes a cooling fan (second cooling unit) that cools the optical element of the color separation / synthesis system β by exhausting air that has taken in outside air from an intake port 18a provided in an exterior lower case 101 described later. Reference numeral 12 denotes an intake duct that holds the cooling fans 10 and 11 and sucks outside air from an intake port 18a described later, and guides the air to the respective intake ports of the cooling fans 10 and 11. Reference numeral 13 denotes an exhaust duct for sending the air exhausted by the cooling fans 10 and 11 to the color separation / synthesis system β. Reference numeral 14 denotes an exhaust fan. The power supply 8 and the ballast 9 are cooled by the air sucked by the exhaust fan 14, the lamp 1 and its surroundings are cooled by exhaust, and the heat is exhausted from the exhaust port 18b described later to the outside of the housing. Reference numeral 15 denotes an exhaust fan holder that holds the exhaust fan 14. Reference numeral 16 denotes a cooling fan for cooling the lamp 1. The cooling fan 16 draws in air that has cooled the optical element of the color separation / synthesis system β and cools the lamp 1 by exhaust. A cooling duct 17 guides 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 outside air into the casing of the projection display device 100, and an exhaust port 18c for exhausting heat outside the casing. Reference numeral 19 denotes an air filter that suppresses dust from entering the casing when the outside air is sucked into the mounting casing in the vicinity of the intake port 18a.

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

  Next, with reference to FIG. 2, the structure of the projection lens unit 5 and the shift unit 6 of the projection display apparatus 100 in the present embodiment will be described. FIG. 2 is a perspective view of the projection lens unit 5 and the shift unit 6, and shows a state where 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 to / from the shift unit 6, and is provided in the projection display device 100. Reference numeral 51a denotes a handle for gripping the lever 51 by bending both ends thereof. Reference numeral 61 denotes a motor (drive unit) which is a drive source for moving (driving) the shift unit 6 in the horizontal direction (left-right direction). Reference numeral 62 denotes a gear unit for transmitting power of 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 denotes a gear unit for transmitting the power of the motor 63. Reference numeral 65 denotes a horizontal fixing plate that fixes 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 that fixes the shift unit 6 in the vertical direction in order to suppress the influence of disturbance and the like. Reference numeral 67 denotes screws (fixing members) for fixing the horizontal fixing plate 65 and the vertical fixing plate 66, respectively. Thus, by fixing the screw 67 to the horizontal fixing plate 65 and the vertical fixing plate 66, 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 denotes a horizontal movable plate that holds the projection lens unit 5 and shifts in the horizontal direction. Reference numeral 69 denotes a rotation shaft that shifts the horizontal movable plate 68 in the horizontal direction by the rotation of the gear unit 62. Since the horizontal movable plate 68 is attached via the rotating shaft 69, it can be shifted by driving the motor 61. Also in the vertical direction, a vertical 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 disposed on the opposite side of the motors 61 and 63 with respect to the plane PL including the optical axis OA (a vertical line perpendicular to the optical axis OA). Preferably, the projection lens unit 5 can be attached to and detached from the projection display device 100 by rotating the lever 51 within 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 plane PL including the optical axis OA in the entire predetermined range RG. Preferably, lever 51 is arranged on the same side as screw 67 (horizontal fixing plate 65 and vertical fixing plate 66) with respect to surface PL including optical axis OA. Preferably, screws 67 (horizontal fixing plate 65 and vertical fixing plate 66) are arranged on the opposite side of motors 61 and 63 with respect to surface PL including optical axis OA.

  Next, the effect of the position of the screw 67 for fixing the shift unit 6 will be described with reference to FIG. FIG. 4 is a schematic diagram showing an effect related to 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 (this embodiment) in which the shift unit 6 is fixed at a position far from the motor 61 and the gear unit 62. At this time, the distance from the gear unit 62 to the screw 67 is L2, and the force required for fixing is F2. 4A and 4B, the broken line indicates the drive area 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, and therefore the relationship of F2 <F1 is derived.

  If the opposite side to the motors 61 and 63 is not locked across the projection lens unit 5, it is necessary to fix the projection lens unit 5 with an excessive force. Further, when the vicinity is not locked with respect to the projection lens unit 5, the friction at the time of locking cannot be won against the moment that the projection lens unit 5 tries to rotate, so that the projection lens unit 5 rotates. For this reason, 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 display device 100 can be downsized. For this reason, according to the present embodiment, it is possible to provide a miniaturized projection display device in which the projection lens can be replaced using a lever. In addition, it is possible to achieve both ease of lever operation and shift lock.

  Next, a projection display apparatus according to Embodiment 2 of the present invention will be described. First, with reference to FIG. 5 and FIG. 6, the external structure of the projection type display apparatus 100 in a present Example is demonstrated. FIG. 5 is an external perspective view of the projection display device 100. FIG. 6 is a front view of the projection display apparatus 100 and shows a state in which the shift lock screw cover 106 is removed.

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

  As shown in FIG. 6, when the shift lock screw cover 106 is removed from the projection display device 100, a screw (shift lock screw) 67 for suppressing the movement of the shift unit 6 is exposed. In the present 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. FIG. 7 is a perspective view of the front cover 105. The front cover 105 is provided with two attachment portions 105 a for attachment to the outer upper case 102 and two attachment portions 105 b for attachment to the outer lower case 101. Further, the front cover 105 is provided with a cylindrical guide portion 105 c for inserting the screw 67. In order to maintain the rigidity of the guide part 105c, ribs (projections) 105d are provided radially on the outer periphery of the guide part 105c.

  Next, a state where the front cover 105 is removed from the projection display device 100 will be described with reference to FIG. FIG. 8 is a diagram illustrating a state in which the front cover 105 of the projection display device 100 is removed. When the front cover 105 is removed from the projection display device 100, the lever (handle) 51 for attaching / detaching the projection lens unit 5 is exposed when the projection lens unit 5 is replaced. Reference numeral 51 a denotes a handle part (handle part) 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. For this reason, the projection lens unit 5 is removed by rotating the lever 51 counterclockwise from the state in which the projection lens unit 5 is locked. On the other hand, when attaching the lever 51, the projection lens unit 5 can be fixed by rotating clockwise. In this embodiment, the projection lens unit 5 and the shift unit 6 have a structure as shown in FIG.

  Next, a state in which the projection lens unit 5 and the front cover 105 are attached to the projection display device 100 will be described with reference to FIG. FIG. 9 is a sectional view showing a state in which the projection lens unit 5 and the front cover 105 are attached. A rib 105 d provided on the guide portion 105 c comes into contact with the handle portion 51 a of the lever 51. That is, the rib 105d contacts the lever 51 so as to restrict the movement (rotation) of the lever 51. Thereby, the movement of the lever 51 in the loosening direction against disturbances such as vibration is suppressed. For this reason, even when a disturbance such as vibration occurs, the lever 51 does not rotate greatly counterclockwise, so that the projection lens unit 5 can be projected in a securely fixed state. For this reason, according to the present embodiment, it is possible to provide a projection display device that prevents the interchangeable lens from loosening.

  Next, with reference to FIG. 10 and FIG. 11, the projection type display apparatus in Example 3 of this invention is demonstrated. FIG. 10 is a block diagram of a control system of the projection display apparatus 100 in this embodiment. FIG. 11 is a flowchart showing the protection operation of the projection display device 100. Each step of FIG. 11 is mainly performed by the control unit 204 of the projection display device 100.

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

First, in step S <b> 1 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 with a display or sound so that the front cover 105 is attached, and returns to step S1. On the other hand, when the front cover 105 is attached in step S1, the process proceeds to step S3. In step S <b> 3, the control unit 204 outputs a signal to the light source lighting power source 202 so as to perform an ON operation. As the light source lighting power source 202 is turned on, the light source 201 is turned on. In this way, the control unit 204 performs on / off control of the light source lighting power source 202 based on the signal from the detection switch 205.
With such a series of operations, when the front cover 105 is not attached to the projection display device 100, the light source 201 is set not to be lit. On the other hand, since the front cover 105 is attached while the light source 201 is turned on, the lever 51 can be reliably prevented from loosening and can be turned on safely. According to the present embodiment, it is possible to provide a projection display device that prevents loosening of a projection lens that is detachably attached.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

6 Shift unit (moving part)
51 Lever (handle member)
61, 63 Motor (drive unit)
100 Projection display

Claims (7)

A projection display device capable of replacing a projection lens,
A moving unit that moves the projection lens in a direction perpendicular to the optical axis;
A drive unit for driving the moving unit,
The projection display device according to claim 1, wherein a handle member for exchanging the projection lens is disposed on the opposite side of the drive unit with respect to the surface including the optical axis. By rotating the handle member within a predetermined range, the projection lens can be attached to and detached from the projection display device.
2. The projection display device according to claim 1, wherein the handle member is provided on an opposite side of the drive unit with respect to a surface including the optical axis in the entire predetermined range. The projection display device according to claim 1, wherein the handle member is disposed on an opposite side of the drive unit with respect to a vertical line of the projection display device including the optical axis. . A fixing member for fixing the moving part;
4. The projection display device according to claim 1, wherein the handle member is disposed on the same side as the fixing member with respect to a surface including the optical axis. 5. The projection display device according to claim 4, wherein the fixing member is disposed on an opposite side of the driving unit with respect to a surface including the optical axis. A cover member that is detachable to replace the projection lens;
The cover member has a protrusion,
The projection display device according to claim 1, wherein the protrusion of the cover member is in contact with the handle member so as to restrict movement of the handle member. A detection unit for detecting that the cover member is attached;
The projection display device according to claim 1, further comprising: a control unit that performs on / off control of a light source lighting power source based on a signal from the detection unit. .