JP6070019B2 - projector - Google Patents

Description

  The present invention relates to a projector.

Conventionally, a light modulation device that modulates a light beam emitted from a light source and a projector that includes a projection lens that projects the modulated light beam are known. A projector having a lens shift mechanism for moving a projection lens has been proposed so that a user can move a projected image without moving the projector.
Further, a technique has been proposed in which a lens shift mechanism or the like is not damaged by a driving force for moving the projection lens when the projection lens reaches a limit position where the projection lens can move (for example, Patent Document 1). reference).

The lens shift mechanism described in Patent Document 1 includes a movable unit that supports the projection lens and is movable in a direction orthogonal to the optical axis of the projection lens, and a driving unit that generates a driving force for moving the movable unit; A stopper that abuts on the movable unit and restricts the movement range, and a slip mechanism that prevents the driving force of the driving means from being transmitted to the movable unit in a state where the movable unit is in contact with the stopper.
The slip mechanism includes a rotation shaft, a transmission gear attached so as to be rotatable relative to the rotation shaft, a rotation plate attached so as to rotate integrally with the rotation shaft, and an urging force to press the rotation plate against the transmission gear. Means. The transmission gear and the rotating plate have contact surfaces that contact each other, and this contact surface forms a conical surface centered on the central axis of the rotation shaft.
The driving force from the driving means is transmitted to the rotating plate. Then, within the moving range of the movable unit, the driving force transmitted to the rotating plate is transmitted from the transmission gear to the driving gear to move the movable unit. On the other hand, when the movable unit comes into contact with the stopper and reaches the limit of the moving range, the drive gear stops rotating. Therefore, when a predetermined driving force is transmitted to the rotating plate, it is Slip occurs. In this way, the slip mechanism rotates the rotating plate when the movable unit comes into contact with the stopper and reaches the limit of the moving range and a driving force is generated, but the transmission gear does not rotate, and the lens shift mechanism Is prevented from overloading.

JP 2008-268627 A

  However, in the slip mechanism described in Patent Document 1, the rotation of the rotating plate is reliably transmitted to the transmission gear within the moving range of the movable unit, and at the limit of the moving range of the movable unit, It is necessary to configure so that slip is surely generated between the two. That is, the slip mechanism described in Patent Document 1 has problems that it is difficult to set the biasing force of the biasing means, the contact area between the rotating plate and the transmission gear, and the selection of materials for both members. In addition, it may be difficult for the user to recognize whether or not the slip mechanism is operating, and the user may feel uneasy about whether the projection lens is movable or has reached the limit of the range of movement. There is.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A projector according to this application example includes a projection lens and a lens shift mechanism that moves the projection lens, and the lens shift mechanism supports the projection lens, and the projection lens A movable portion movable in a direction perpendicular to the optical axis, a driving portion that generates a driving force for moving the movable portion, a state in which the driving force can be transmitted to the movable portion, and the driving force A switching mechanism capable of switching between a state in which the movable part is not transmitted and a transmission part that transmits the driving force transmitted by the switching mechanism to the movable part, wherein the switching mechanism includes the driving unit and the switching unit. A first gear meshing with one of the transmission parts, a second gear meshing with the other of the drive part and the transmission part, having the same rotational center axis as the first gear, and the same rotational center as the first gear A switching member that is arranged between the first gear and the second gear so as to be movable in the direction of the rotation center axis and is locked in the rotation direction by the first gear; and A biasing portion that biases toward the second gear side, and the second gear is disposed on a side facing the switching member on a circumference centered on the rotation center axis. The switching member has a second tooth portion that meshes with the first tooth portion by an urging force of the urging portion, and the switching mechanism includes the second tooth portion within a movable range of the movable portion. The first gear and the second gear rotate together in a state where the one tooth portion and the second tooth portion mesh with each other, and the driving force is transmitted from one of the first gear and the second gear to the other. And when the driving force is generated when the limit of the movable range is reached, the switching is performed. When the material moves in a direction away from the second gear against the biasing force of the biasing portion by the driving force, one of the first gear and the second gear meshing with the driving portion is And a non-transmission state in which the other rotation that rotates and meshes with the transmission portion is restricted and the driving force is not transmitted from one of the first gear and the second gear to the other.

According to this configuration, the lens shift mechanism includes the switching mechanism, and the switching mechanism has a transmission state in which the driving force of the driving unit can be transmitted to the transmission unit in a movable range (movable range) of the movable unit. When the movable part reaches the limit of the movable range and the movement is restricted (movement restricted state), the non-transmission state in which the driving force of the drive part is not transmitted to the transmission part can be switched.
That is, since the switching member in the switching mechanism is engaged with the first gear in the rotation direction, it rotates together with the first gear. The switching member urged by the urging portion maintains the state in which the second tooth portion meshes with the first tooth portion within the movable range of the movable portion, and the driving force from the driving portion is increased. Transmission is performed from one gear to the second gear or from the second gear to the first gear. That is, the switching mechanism is in the transmission state, and when the driving force is generated in the driving unit, the lens shift mechanism sequentially transmits the driving force from the switching mechanism to the transmitting unit to move the movable unit, that is, the projection lens.
On the other hand, when the movable part is in the movement restricted state, one of the first gear and the second gear meshing with the transmission part and the transmission part corresponds to the direction (regulation direction) in which the movement of the movable part is restricted. The rotation in the direction to be controlled is restricted. In this movement restricted state, when a drive force in a direction corresponding to the restricted direction is applied to the drive unit, the drive force is transmitted from either the first gear or the second gear to the switching member. Then, the switching member (second tooth portion) to which the driving force is transmitted moves in a direction away from the second gear (first tooth portion) against the urging force of the urging portion, and the first gear or The second gear will idle. That is, the switching mechanism is in a non-transmitting state in which the driving force of the driving unit is not transmitted to the transmitting unit.
As described above, the lens shift mechanism includes the switching mechanism that can switch between the transmission state and the non-transmission state. Thus, it is possible to prevent the driving force from the driving unit from being transmitted to the movable unit in the movement restricted state of the movable unit. As a result, even when a driving force in a direction corresponding to the regulation direction is generated in the drive unit in the movement-restricted state of the movable unit, the driving force is not transmitted to the movable unit, so the lens shift mechanism is configured. It is possible to prevent damage to the member to be performed.

Since the switching mechanism has a configuration in which the first tooth portion provided on the second gear and the second tooth portion provided on the switching member mesh with each other, compared to the configuration using the frictional force by the slip mechanism, the distance between both members The driving force can be reliably transmitted, and the setting of the members constituting the switching mechanism is facilitated.
Further, the switching mechanism can reliably transmit the driving force of the driving unit to the movable unit within the movable range of the movable unit even if the biasing force of the biasing unit is small compared to the configuration of the slip mechanism.
Therefore, a lens shift mechanism including a switching mechanism that can be reduced in size and weight and can be easily manufactured becomes possible. Therefore, it is possible to provide a projector provided with this lens shift mechanism by suppressing the increase in size and weight and simplifying the manufacture.

In the movement restriction state of the movable part, when a driving force in a direction corresponding to the restriction direction is generated by the drive part, either one of the first tooth part and the second tooth part rotates over the other, so that the operation sound Thus, the user can easily recognize that the projection lens has reached the limit of the movable range.
In addition, since the switching mechanism is configured to include the first gear and the second gear, the reduction ratio and the degree of freedom in setting the torque for the drive unit and the transmission unit can be improved as compared with the slip mechanism including one gear.

  Application Example 2 In the projector according to the application example, it is preferable that the driving unit generates a driving force when manually operated.

  According to this configuration, since the drive unit is configured manually, when the movable unit reaches the limit of the movable range, the user who operates the drive unit receives the first tooth unit and the second tooth unit. It becomes possible to give a feeling such as a click feeling when either one gets over the other, and it is possible to make the user easily recognize that the movable part has reached the limit of the movable range.

  Application Example 3 In the projector according to the application example described above, the drive unit includes a dial that is rotated and a drive gear that is coaxial with a rotation center axis of the dial, and the first gear is the drive gear. And a tooth mold forming part formed with a tooth mold that meshes with either one of the transmission parts, and a projecting part provided with a storage part protruding from the tooth mold forming part and storing the biasing part, It is preferable that the first gear is arranged such that the protruding portion is located on the opposite side to the side where the dial is arranged with respect to the tooth mold forming portion.

According to this configuration, since the first gear includes the storage unit that stores the urging unit, the switching mechanism can be configured with a simple configuration while suppressing an increase in the number of components.
In addition, since the first gear is arranged so that the protruding portion is located on the opposite side of the dial, it is possible to easily expose the dial from the outer casing of the projector and store the protruding portion in the outer casing. It becomes. Therefore, it is possible to provide a projector that improves the operability of the lens shift mechanism and efficiently stores the switching mechanism in the exterior housing to improve the design.

  Application Example 4 In the projector according to the application example described above, it is preferable that the first tooth portion and the second tooth portion have a flat surface that meshes with each other.

  According to this configuration, the first tooth portion and the second tooth portion are formed so that the surfaces that mesh with each other are flat, so the first tooth portion and the second tooth portion are in surface contact and mesh with each other. The frictional force is increased as compared with the configuration in which the surface is formed of a curved surface. As a result, even if the meshing amount between the first tooth part and the second tooth part is set to be small or the urging force of the urging part is set to be small, a reliable transmission state is possible, and the switching mechanism is further downsized. And weight reduction.

  Application Example 5 In the projector according to the application example described above, it is preferable that the first tooth portion and the second tooth portion have inclined portions that mesh with each other in the rotation center axis direction.

  According to this configuration, since the first tooth portion and the second tooth portion are formed as described above, it is possible to smoothly switch between the transmission state and the non-transmission state of the switching mechanism.

1 is a schematic diagram showing a schematic configuration of a projector according to an embodiment. FIG. 2 is a perspective view showing a part of the appearance of the projector according to the embodiment. FIG. 3 is a perspective view of a projection lens, a lens shift mechanism, and a head body according to the present embodiment. The perspective view which shows the 1st wheel train mechanism of this embodiment, and the 2nd gear train mechanism. The disassembled perspective view of the switching mechanism of this embodiment. Sectional drawing of the switching mechanism of this embodiment. Sectional drawing which shows typically the 1st tooth | gear part and 2nd tooth | gear part of this embodiment.

Hereinafter, the projector according to the present embodiment will be described with reference to the drawings.
The projector according to the present embodiment modulates a light beam emitted from a light source according to image information and enlarges and projects it on a screen or the like.
[Main components of the projector]
FIG. 1 is a schematic diagram illustrating a schematic configuration of a projector 1 according to the present embodiment.
As shown in FIG. 1, the projector 1 includes an outer casing 2 that constitutes an outer casing, a control unit (not shown), an optical unit 3 that includes a light source device 31 and a projection lens 36. Although not shown, a power supply device that supplies power to the light source device 31 and the control unit, a cooling device that cools the optical unit 3, and the like are further arranged inside the exterior housing 2.

  The projector 1 according to this embodiment includes a lens shift mechanism 5 that moves the projection lens 36 and is configured to move an image projected on a screen or the like. In the following, for convenience of explanation, the direction in which the light beam is emitted from the projection lens 36 is referred to as the front side, and the upper side in the installation posture where the projector 1 is installed on the desk or the like is referred to as the upper side.

FIG. 2 is a perspective view showing a part of the external appearance of the projector 1 and showing the vicinity of the projection lens 36.
The exterior housing 2 is made of synthetic resin, and as shown in FIG. 2, an upper case 21 that forms the upper portion of the exterior housing 2, a lower case (not shown) that forms the lower portion, and a front that forms the front portion. A case 22 and the like are provided, and these are fixed by screws or the like.

  As shown in FIG. 2, the front case 22 is formed so that the tip of the projection lens 36 is exposed from the center. The upper case 21 and the front case 22 are formed such that dials 61 and 161 for operating the lens shift mechanism 5 are exposed at the boundary between both members.

  Although not shown, the exterior housing 2 is provided with an intake port for taking in outside air, an exhaust port for exhausting warm air inside the exterior housing 2 to the outside, and the like.

  The control unit includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and functions as a computer, and is related to control of the operation of the projector 1, for example, image projection. Control and so on.

[Configuration of optical unit]
The optical unit 3 optically processes and projects the light beam emitted from the light source device 31 under the control of the control unit.
As shown in FIG. 1, in addition to the light source device 31, the optical unit 3 includes an integrator illumination optical system 32, a color separation optical system 33, a relay optical system 34, an optical device 4, a head body 37, a projection lens 36, and a lens shift mechanism. 5 and an optical component casing 38 for arranging these members at predetermined positions on the optical path.

  As shown in FIG. 1, the optical unit 3 is formed in a substantially L shape in plan view, and the light source device 31 is detachably disposed at one end, and the projection lens 36 is disposed at the other end. In the following, for convenience of explanation, the direction in which the light beam is emitted from the light source device 31 is described as + X direction, the direction in which light projected from the projector 1 is emitted is defined as + Y direction (forward direction), and the upward direction is described as + Z direction. To do. Further, the ± X direction is the left-right direction.

  The light source device 31 includes a discharge-type light source 311 made of an ultra-high pressure mercury lamp, a metal halide lamp, and the like, a reflector 312, etc. Eject.

  The integrator illumination optical system 32 includes a first lens array 321, a second lens array 322, a polarization conversion element 323, and a superimposing lens 324, and a light beam emitted from the light source device 31 is substantially on the surface of a liquid crystal light valve 43 described later. It is configured to be uniformly irradiated and to be used effectively.

  The color separation optical system 33 includes two dichroic mirrors 331 and 332 and a reflection mirror 333, and the light emitted from the integrator illumination optical system 32 is converted into red light (hereinafter referred to as “R light”) and green light (hereinafter referred to as “R”). G light ”) and blue light (hereinafter referred to as“ B light ”).

  The relay optical system 34 includes an incident side lens 341, a relay lens 343, and reflection mirrors 342 and 344, and has a function of guiding the R light separated by the color separation optical system 33 to the R light liquid crystal light valve 43. The optical unit 3 has a configuration in which the relay optical system 34 guides the R light. However, the configuration is not limited thereto, and may be configured to guide the B light, for example.

The optical device 4 is an electro-optical device 40 provided for each color light (the electro-optical device for R light is 40R, the electro-optical device for G light is 40G, and the electro-optical device for B light is 40B), And a cross dichroic prism 41 as a color synthesizing optical device.
Each electro-optical device 40 includes an incident-side polarizing plate 42, a liquid crystal light valve 43 serving as a light modulation device, and an emission-side polarizing plate 44, and modulates each color light according to image information.

  The cross dichroic prism 41 has a substantially square shape in plan view in which four right angle prisms are bonded together, and two dielectric multilayer films are formed on the interface where the right angle prisms are bonded together. In the cross dichroic prism 41, the dielectric multilayer film reflects the color light modulated by the electro-optical devices 40R and 40B, transmits the color light modulated by the electro-optical device 40G, and synthesizes each color light.

  The projection lens 36 has a plurality of lenses (not shown) arranged along the optical axis 36j, and enlarges and projects the light combined by the cross dichroic prism 41 on the screen.

FIG. 3 is a perspective view of the projection lens 36, the lens shift mechanism 5, and the head body 37.
Although the detailed configuration of the lens shift mechanism 5 will be described later, when the dials 61 and 161 are rotated manually, the projection lens 36 is moved in a plane orthogonal to the optical axis 36j.

  The head body 37 supports the lens shift mechanism 5 and is attached to the optical component casing 38. As shown in FIG. 3, the head body 37 is provided with an upper restricting portion 371 that protrudes forward from the upper end portion and a lower restricting portion 372 that protrudes forward from the lower end portion. The upper restricting portion 371 is provided for restricting the upward movement of the projection lens 36, and the lower restricting portion 372 is provided for restricting the downward movement of the projection lens 36. Although not shown, the head body 37 is also provided with a restricting portion for restricting the movement of the projection lens 36 in the left-right direction.

[Configuration of lens shift mechanism]
Here, the lens shift mechanism 5 will be described in detail.
As shown in FIG. 3, the lens shift mechanism 5 includes a first movable part 51, a second movable part (not shown), a first wheel train mechanism 53, and a second wheel train mechanism 54.

The first movable portion 51 is a member that is disposed in front of the head body 37 and supports the projection lens 36. The projection lens 36 is fixed to the first movable portion 51 by a bayonet structure using a leaf spring or the like, or a screw.
The first movable portion 51 is configured to be movable with respect to the head body 37 in the vertical direction (± Z direction) orthogonal to the optical axis 36j with respect to the head body 37 when the dial 61 is rotated. When the first movable portion 51 is moved upward, the first movable portion 51 comes into contact with the upper restricting portion 371 of the head body 37 at a predetermined position, and further upward movement is restricted. The head body 37 abuts on the lower regulating portion 372 and further downward movement is regulated. The first movable portion 51 is configured to be freely movable between the upper restricting portion 371 and the lower restricting portion 372 (a vertically movable range).

  The second movable part is disposed between the head body 37 and the first movable part 51. The second movable part guides the movement of the first movable part 51 in the vertical direction (± Z direction), and the dial 161 is rotated so that the first movable part 51 and the horizontal direction perpendicular to the optical axis 36j are operated. It is configured to be movable in the (± X direction). That is, the projection lens 36 supported by the first movable portion 51 is configured to be movable in the vertical direction with respect to the second movable portion, and is configured to be movable in the left-right direction together with the second movable portion. Further, the second movable portion is configured to be freely movable while being restricted by a restriction portion (not shown) in the left-right direction provided in the head body 37 (a left-right movable range).

FIG. 4 is a perspective view showing the first wheel train mechanism 53 and the second wheel train mechanism 54, and is a view in which support portions 55 and 56 to be described later are omitted.
The first gear train mechanism 53 is a mechanism for moving the first movable portion 51 in the vertical direction. As shown in FIG. 4, the drive portion 6, the switching mechanism 7, the transmission portion 8, and the support portion 55 (see FIG. 3). ).

  The driving unit 6 generates a driving force for moving the first movable unit 51 in the vertical direction by a user's manual operation. As shown in FIG. 3, the drive unit 6 is disposed on the upper side in the vicinity of the + X side end of the lens shift mechanism 5.

As shown in FIG. 4, the drive unit 6 includes a dial 61 that is rotated by a user, and a drive gear 62 that is formed integrally with the dial 61.
As shown in FIG. 4, the dial 61 has a shape in which a conical upper portion is cut, and is arranged so as to be rotatable around a rotation center axis along the vertical direction. A concave portion is provided on the upper surface of the dial 61, and a rib 611 that can be held by the user is formed in the central portion of the concave portion. Further, the side surface 612 of the dial 61 is provided with unevenness for preventing slippage when operated by the user.

  As shown in FIG. 2, the dial 61 is arranged such that the rib 611 is exposed from the upper side of the exterior casing 2 and a part of the side surface 612 is exposed from the front side of the exterior casing 2. The dial 61 is configured to be capable of rotating operation (rib operation) with the rib 611 sandwiched or rotating operation (side operation) by pressing in the tangential direction to the side surface 612.

  As described above, the dial 61 is configured so that the rib operation and the side operation are possible, so that the projector 1 is installed on a desk or the like, and the projector 1 is turned upside down with respect to the installation and installed on the ceiling or the like. In both of the ceiling-mounted installations, whichever is easy to operate can be selected, and the operability when moving the projection lens 36 is improved.

  As shown in FIG. 4, the drive gear 62 is formed on the lower side of the dial 61 with the rotation center axis of the dial 61 as the same axis. To communicate.

The switching mechanism 7 and the transmission unit 8 sequentially transmit the driving force of the driving unit 6 to the first movable unit 51.
As shown in FIG. 4, the switching mechanism 7 is disposed behind the drive unit 6 (−Y side).
Although the structure of the switching mechanism 7 will be described in detail later, a first gear 71 that meshes with the drive gear 62 of the drive unit 6 and a second gear 72 that meshes with the transmission unit 8 are provided. The switching mechanism 7 is in a state (transmission state) in which the driving force of the driving unit 6 is transmitted to the transmission unit 8 within a range in which the first movable unit 51 can move. When the movement is restricted by coming into contact with the side restricting portion 372, the driving force of the driving portion 6 is not transmitted to the transmitting portion 8 (non-transmitting state).

As shown in FIG. 4, the transmission unit 8 includes a gear 81 and a lead screw 82 that mesh with the second gear 72 of the switching mechanism 7.
The lead screw 82 has a thread groove formed on the outer periphery, and one end is inserted through an insertion hole provided in the center of the gear 81, and the other end is between the gear 81 and the thread groove. It is supported by the head body 37. The gear 81 and the lead screw 82 are disposed so as to be integrally rotatable with the rotation center axis along the vertical direction being coaxial.

  The support unit 55 supports the drive unit 6, the switching mechanism 7, and the gear 81 and is attached to the head body 37. As shown in FIG. 3, the support portion 55 includes an upper support member 55U and a lower support member 55D located below the upper support member 55U. The upper support member 55U and the lower support member 55D are formed from sheet metal by press working or the like, the dial 61 is located above the upper support member 55U, and the drive gear 62, the switching mechanism 7 and the gear 81 are arranged on the upper side. It is supported so as to be positioned between the support member 55U and the lower support member 55D.

  The lead screw 82 is engaged with a pulling member (not shown) that pulls the first movable portion 51, and this pulling member is provided with a protruding portion that is locked to the first movable portion 51 in the vertical direction. ing.

  When the dial 61 is rotated, the lead screw 82 is rotated via the drive gear 62, the switching mechanism 7, and the gear 81, and the traction member meshed with the lead screw 82 moves according to the rotation direction of the dial 61. As a result, the first movable part 51, that is, the projection lens 36 supported by the first movable part 51 moves in the vertical direction. In the lens shift mechanism 5 of the present embodiment, when the dial 61 is rotated clockwise as viewed from above, the projection lens 36 is moved upward, and when the dial 61 is rotated counterclockwise, the projection lens 36 is moved downward. Configured to move to.

The second wheel train mechanism 54 is a mechanism for moving the first movable portion 51, that is, the projection lens 36 in the left-right direction by moving the second movable portion in the left-right direction. As shown in FIG. 16, the switching mechanism 17, the transmission part 9, and the support part 56 (refer FIG. 3).
The drive unit 16 is composed of a member common to the drive unit 6, and has a dial 161 and a drive gear 162 having the same shape as the dial 61 and the drive gear 62.
The driving unit 16 generates a driving force for moving the second movable unit in the left-right direction by a user's manual operation. As shown in FIG. 3, the drive unit 16 is disposed on the upper side in the vicinity of the −X side end of the lens shift mechanism 5.

As shown in FIG. 2, the dial 161 is arranged so that the ribs 1611 are exposed from the upper side of the outer casing 2 and a part of the side surface 1612 is exposed from the front side of the outer casing 2 as in the dial 61. . The dial 161 is configured to rotate by a rib operation or a side surface operation, like the dial 61.
Similarly to the drive gear 62 of the drive unit 6, the drive gear 162 rotates together with the dial 161 by the rotation of the dial 161 and transmits the rotation to the switching mechanism 17.

The switching mechanism 17 and the transmission unit 9 sequentially transmit the driving force of the driving unit 16 to the second movable unit.
As shown in FIG. 4, the switching mechanism 17 is disposed behind the drive unit 16 (−Y side).
The switching mechanism 17 includes a member common to the switching mechanism 7 and includes a first gear 171 that meshes with the drive gear 162 of the drive unit 16 and a second gear 172 that meshes with the transmission unit 9. Then, the switching mechanism 17 enters a state (transmission state) in which the driving force of the drive unit 16 is transmitted to the transmission unit 9 within a range in which the second movable unit can move, and the second movable unit hits the regulation unit (not shown). When the movement is restricted in contact, the driving force of the driving unit 16 is not transmitted to the transmitting unit 9 (non-transmitting state).

As shown in FIG. 4, the transmission unit 9 includes a gear 91, a laminated gear 92, a bevel gear 93, and a lead screw 94.
The gear 91 is configured to mesh with the second gear 172 of the switching mechanism 17.
The laminated gear 92 includes a gear 921 meshing with the gear 91 and a bevel gear 922 provided below the gear 921 with the rotation center axis of the gear 921 being coaxial.

The bevel gear 93 is formed so as to mesh with the bevel gear 922, and is arranged so that the rotation center axis is along the left-right direction.
An insertion hole is provided in the central portion of the bevel gear 93, and one end portion of the lead screw 94 is inserted into the insertion hole. The bevel gear 93 and the lead screw 94 are coaxial with the central axis along the left-right direction. It is comprised so that rotation is possible integrally.

The lead screw 94 has a thread groove formed on the outer periphery, and is supported by the head body 37 between the bevel gear 93 and the thread groove and at the end opposite to the side where the bevel gear 93 is disposed. .
The support unit 56 supports the drive unit 16, the switching mechanism 17, the gear 91, and the laminated gear 92, and is attached to the head body 37. As shown in FIG. 3, the support portion 56 includes an upper support member 56U and a lower support member 56D positioned below the upper support member 56U.
The upper support member 56U and the lower support member 56D are formed from sheet metal by press working or the like, and the dial 161 is located above the upper support member 56U. The drive gear 162, the switching mechanism 17, the gear 91, and the stack The gear 92 is supported so as to be positioned between the upper support member 56U and the lower support member 56D.

The lead screw 94 is engaged with a pulling member (not shown) that pulls the second movable portion, and the pulling member is provided with a protruding portion that is locked to the second movable portion in the left-right direction. .
When the dial 161 is rotated, the lead screw 94 is rotated through the drive gear 162, the switching mechanism 17, the gear 91, the laminated gear 92, and the bevel gear 93, and the traction member meshed with the lead screw 94 is dial 161. It moves according to the direction of rotation. As a result, the second movable part, that is, the projection lens 36 supported by the second movable part via the first movable part 51 moves in the left-right direction. In the lens shift mechanism 5 of this embodiment, when the dial 161 is rotated clockwise as viewed from above, the projection lens 36 moves in the + X direction, and when the dial 161 is rotated counterclockwise, the projection lens 36 is − It is configured to move in the X direction.

[Configuration of switching mechanism]
Here, the switching mechanisms 7 and 17 will be described in detail. Here, the description will be given focusing on the switching mechanism 7.

FIGS. 5A and 5B are exploded perspective views of the switching mechanism 7, in which FIG. 5A is a diagram viewed from above and FIG. 5B is a diagram viewed from below. FIG. 6 is a cross-sectional view of the switching mechanism 7.
As shown in FIG. 5, the switching mechanism 7 includes a switching member 73 and a coil spring 74 as an urging portion in addition to the first gear 71 and the second gear 72.

As shown in FIG. 5A, the first gear 71 has a rotation center shaft 7 </ b> J, and a tooth shape forming portion 711 in which a tooth shape that meshes with the driving gear 62 (see FIG. 4) of the driving portion 6 is formed. , And a protruding portion 712 protruding from the lower side (−Z side) of the tooth mold forming portion 711.
The protruding portion 712 is formed in a columnar shape having an outer diameter smaller than the outer diameter of the tooth mold forming portion 711 with the rotation center axis 7J as the center.
As shown in FIG. 6, a housing portion 713 that exposes and stores a part of the coil spring 74 in the compression direction is provided at the center of the protruding portion 712.

As shown in FIG. 6, a round hole 713 </ b> H centering on the rotation center shaft 7 </ b> J is formed on the bottom surface of the storage portion 713. An edge of the round hole 713 </ b> H is centered on the rotation center shaft 7 </ b> J, A cylindrical guide part 714 extending toward the tooth mold forming part 711 is provided. As shown in FIG. 6, the guide portion 714 is formed at a height that is approximately half the depth of the storage portion 713.
As shown in FIG. 4, the first gear 71 is disposed such that the protruding portion 712 is located on the opposite side to the side on which the dial 61 is disposed with respect to the tooth form forming portion 711.

As shown in FIG. 5B, the second gear 72 has a tooth center forming portion 721 in which a rotation center shaft 7J is coaxial and a tooth shape that meshes with the gear 81 (see FIG. 4) is formed. A projecting portion 722 projecting from below the portion 721 (in the −Z direction) is provided, and a round hole 72H centering on the rotation center shaft 7J is formed at the center.
The tooth mold forming part 721 is formed to have the same outer diameter as the tooth mold forming part 711 of the first gear 71.
As shown in FIG. 6, the protruding portion 722 is formed in a cylindrical shape having the same size as the guide portion 714 of the first gear 71, and the second gear 72 has the protruding portion 722 facing the guide portion 714. Be placed.

Further, as shown in FIG. 5B, a first tooth portion 72 </ b> G is provided outside the protrusion portion 722 on the surface of the tooth shape forming portion 721 on the protrusion portion 722 side (side facing the switching member 73). ing.
A plurality of first tooth portions 72G are arranged at equal intervals on a circumference centered on the rotation center shaft 7J.
FIG. 7 is a partial cross-sectional view schematically showing the second gear 72 and the switching member 73.
The first tooth portion 72G is formed radially about the rotation center axis 7J and has an inclined portion in the direction of the rotation center axis 7J. More specifically, as for the 1st tooth | gear part 72G, the cross section along the circumferential direction is formed in trapezoid shape, as shown in FIG.

The switching member 73 is disposed between the first gear 71 and the second gear 72 with the rotation center shaft 7J as the same axis.
As illustrated in FIG. 5A, the switching member 73 includes a columnar flange portion 731 and a cylindrical portion 732 that protrudes from the lower side (−Z side) of the flange portion 731.
The flange portion 731 has an outer diameter smaller than that of the tooth mold forming portion 721, and a second tooth portion 73G that can mesh with the first tooth portion 72G is formed on the surface on the second gear 72 side.

  Similarly to the first tooth portion 72G, the second tooth portion 73G is formed radially about the rotation center axis 7J, and is inclined corresponding to the inclined portion of the first tooth portion 72G in the direction of the rotation center axis 7J. Part. More specifically, as shown in FIG. 7, the second tooth portion 73G has a trapezoidal cross section along the circumferential direction. As for the 1st tooth part 72G and the 2nd tooth part 73G, the surface which mutually meshes | engages is formed in the plane, and the 1st tooth part 72G and the 2nd tooth part 73G will mesh | engage by surface contact.

  As shown in FIG. 6, the cylindrical portion 732 is formed so that the outer diameter is smaller than the inner diameter of the coil spring and the inner diameter is larger than the outer diameter of the guide portion 714 and the protruding portion 722. The switching member 73 is disposed between the first gear 71 and the second gear 72 with the guide portion 714 and the protruding portion 722 inserted through the cylindrical portion 732.

  Further, as shown in FIG. 5A, the cylindrical portion 732 is provided with a slit 733 cut out along the rotation center axis 7J. The slit 733 is formed so as to engage with a protrusion (not shown) provided in the first gear 71, and the switching member 73 is locked to the first gear 71 in the rotation direction. That is, the switching member 73 rotates together with the first gear 71 as the first gear 71 rotates.

  The coil spring 74 is disposed between the first gear 71 and the switching member 73. Specifically, as shown in FIG. 6, the coil spring 74 is housed in the housing portion 713 of the first gear 71, one end abuts against the bottom of the first gear 71, and the other end is the second tooth portion of the flange portion 731. It contacts the surface opposite to 73G and biases the switching member 73 toward the second gear 72 side.

  As shown in FIG. 6, the switching mechanism 7 includes a support pin 55Up provided on the upper support member 55U that is inserted into the round holes 713H and 72H and pivotally supported by the support pin 55Up. A washer W is provided at the tip of the support pin 55Up. The screw Sc is tightened via the screw to be attached to the upper support member 55U. Since the switching member 73 is biased by the coil spring 74, the second tooth portion 73 </ b> G is engaged with the first tooth portion 72 </ b> G of the second gear 72.

[Operation of switching mechanism]
Here, the operation of the switching mechanism 7 will be described.
The switching mechanism 7 maintains the state in which the first tooth portion 72G and the second tooth portion 73G are engaged with each other in the vertically movable range of the first movable portion 51, and the driving force of the driving portion 6 is changed from the first gear 71 to the first. Two gears 72 are transmitted. That is, the switching mechanism 7 is in a transmission state in which the driving force of the driving unit 6 is transmitted to the transmission unit 8 in the range in which the first movable unit 51 can move up and down.
Specifically, when the dial 61 is rotated in one direction (clockwise as viewed from above), the driving force is transmitted to the first gear 71 via the driving gear 62. This driving force is also transmitted to the switching member 73 that is locked to the first gear 71 in the rotational direction.

  Since the second tooth portion 73G meshes with the first tooth portion 72G, the second gear is pressed by pressing the first tooth portion 72G with the driving force F transmitted to the switching member 73 as shown in FIG. 72 is rotated. Thus, the switching mechanism 7 maintains the state where the first tooth portion 72G and the second tooth portion 73G mesh with each other in the vertically movable range of the first movable portion 51, and the driving force F is supplied from the first gear 71. It is transmitted to the second gear 72.

The rotation of the second gear 72 is transmitted to the lead screw 82 via the gear 81 (see FIG. 4). As a result, the first movable portion 51 and the projection lens 36 move upward via the traction member. .
When the dial 61 is rotated in the other direction (counterclockwise when viewed from above), the driving force is similarly transmitted to the first movable portion 51, and the first movable portion 51 and the projection lens 36 are moved downward. Moving.

On the other hand, when the first movable portion 51 comes into contact with the upper restricting portion 371 and the lower restricting portion 372 of the head body 37, the first movable portion 51 reaches the limit of the movable range and is in a state in which movement is restricted (movement restricted state). The mechanism 7 is in a non-transmitting state in which the driving force of the driving unit 6 is not transmitted to the transmitting unit 8.
Specifically, in the movement restricted state, the lead screw 82 and the gear 81 cannot rotate in the direction corresponding to the direction (regulation direction) in which the first movable portion 51 is restricted, and mesh with the gear 81. The second gear 72 is also in a state where it cannot rotate in the direction corresponding to the regulation direction.

  When the dial 61 is rotated in the direction corresponding to the restriction direction while the second gear 72 cannot rotate in the direction corresponding to the restriction direction, the dial 61 is transmitted to the switching member 73 via the drive gear 62 and the first gear 71. With the driving force F, the second tooth portion 73G presses the first tooth portion 72G of the second gear 72. However, since the rotation of the second gear 72 is restricted, the switching member 73 causes the second gear 73G to slide on the surface of the first gear 72G against the urging force of the coil spring 74, and the second gear 72G. It moves in a direction away from 72 (indicated by a two-dot chain line in FIGS. 6 and 7).

  When the dial 61 is further rotated, the switching member 73 moves so that the second tooth portion 73G gets over the first tooth portion 72G, is urged by the coil spring 74, and meshes with the adjacent first tooth portion 72G. The operation of getting over the adjacent first tooth portion 72G is repeated. Therefore, the switching member 73 idles together with the first gear 71, and the switching mechanism 7 does not transmit the driving force of the driving unit 6 from the first gear 71 to the second gear 72, that is, the transmission unit 8. Therefore, an excessive load on the second gear 72, the gear 81, the lead screw 82, and the first movable part 51, whose movement is restricted, is restricted.

  More specifically, in the non-transmission state, the force that regulates the rotation of the second gear 72 that meshes with the transmission portion 8 from the frictional force generated between the first tooth portion 72G and the second tooth portion 73G. The direction of the switching member 73 is such that the second tooth portion 73G cannot maintain meshing with the first tooth portion 72G of the second gear, and is separated from the second gear 72 against the biasing force of the coil spring 74. Move to. Thereby, the rotation of the second gear 72 is restricted.

In this movement restricted state, when the dial 61 is rotated in the other direction (the direction opposite to the direction corresponding to the restriction direction), the second gear 72 is not restricted from rotating in the direction corresponding to this direction. By the driving force from the dial 61, the second tooth portion 73G presses the first tooth portion 72G and rotates the second gear 72. Then, the first movable portion 51 moves in the direction opposite to the regulated direction.
As described above, the switching mechanism 7 has a transmission state in which the driving force of the driving unit 6 is transmitted to the transmission unit 8 in the movable range of the first movable unit 51 in the vertical direction and the movement of the first movable unit 51 in the vertical direction. In the restricted state, the non-transmission state in which the driving force is not transmitted to the transmission unit 8 can be switched.

  The switching mechanism 17 operates in the same manner as the switching mechanism 7. In the movable range of the second movable part in the left-right direction, the switching mechanism 17 transmits the driving force of the drive unit 16 to the transmission unit 9 and the second movable in the left-right direction. In the movement restricting state of the part, the non-transmission state in which the driving force is not transmitted to the transmission unit 9 can be switched.

As described above, according to the present embodiment, the following effects can be obtained.
(1) Since the lens shift mechanism 5 includes the switching mechanisms 7 and 17 that can switch between the transmission state and the non-transmission state, the driving unit is within the movable range of the first movable unit 51 and the second movable unit. 6 and 16 are reliably transmitted to the first movable part 51 and the second movable part, and the driving force from the drive parts 6 and 16 is limited at the limit of the movable range of the first movable part 51 and the second movable part. It can be made not to transmit to the 1st movable part 51 and the 2nd movable part. Thus, even when the dials 61 and 161 are rotated in the direction corresponding to the regulation direction in a state where the first movable unit 51 and the second movable unit are moved to the limit of the movable range (the drive units 6 and 16 are driven). Even if a force is generated), since the driving force is not transmitted to the first movable part 51 and the second movable part, the first movable part 51, the second movable part, the first movable part 51, and the second movable part It is possible to prevent damage to the members that restrict the movement, the members constituting the first gear train mechanism 53, the second gear train mechanism 54, and the like.

(2) Since the switching mechanisms 7 and 17 are configured such that the first tooth portion 72G provided on the second gear 72 and the second tooth portion 73G provided on the switching member 73 mesh with each other, the frictional force generated by the slip mechanism is generated. Compared to the utilized configuration, it is possible to ensure the transmission of the driving force between both members, and the setting of the members constituting the switching mechanisms 7 and 17 is facilitated.
In addition, the switching mechanisms 7 and 17 can reduce the driving force of the driving units 6 and 16 within the movable range of the first movable unit 51 and the second movable unit even if the biasing force of the coil spring 74 is small compared to the configuration of the slip mechanism. It becomes possible to transmit to the 1st movable part 51 and the 2nd movable part reliably.
Therefore, the lens shift mechanism 5 including the switching mechanisms 7 and 17 that can be reduced in size and weight and can be easily manufactured becomes possible. Therefore, it is possible to provide the projector 1 including the lens shift mechanism 5 by suppressing the increase in size and weight and simplifying the manufacturing.

(3) When the first movable portion 51 and the second movable portion reach the limit of the movable range, when the dials 61 and 161 are rotated in the direction corresponding to the regulation direction, the switching member 73 becomes the second tooth Since the portion 73G rotates over the first tooth portion 72G sequentially, an operation sound is generated, and the user can easily recognize that the projection lens 36 has reached the limit of the movable range.
Further, it is possible to give the user who operates the dials 61 and 161 a feel such as a click feeling when the second tooth portion 73G exceeds the first tooth portion 72G, and the first movable portion 51 and the second movable portion are provided. It becomes possible for the user to easily recognize that the limit of the movable range has been reached.

  (4) Since the switching mechanisms 7 and 17 include the first gears 71 and 171 and the second gears 72 and 172, the driving units 6 and 16 and the transmission units 8 and 9 are compared with the slip mechanism including one gear. The degree of freedom in setting the reduction ratio and torque can be improved.

(5) Since the first gears 71 and 171 include the storage portion 713 for storing the coil spring 74, the switching mechanisms 7 and 17 can be configured with a simple configuration while suppressing an increase in the number of components. Become.
Further, since the first gears 71 and 171 are arranged so that the protruding portion 712 is positioned on the opposite side of the dials 61 and 161, the dials 61 and 161 are exposed from the exterior casing 2, and the protruding portion 712 is attached to the exterior. It can be easily stored in the housing 2. Therefore, the operability of the lens shift mechanism 5 can be improved, and the switching mechanisms 7 and 17 can be efficiently housed in the outer casing 2 to provide the projector 1 with improved design.

  (6) Since the first tooth portion 72G and the second tooth portion 73G have flat surfaces that mesh with each other, the first tooth portion 72G and the second tooth portion 73G come into surface contact and mesh with each other. The frictional force is increased as compared with the configuration in which the surface is formed of a curved surface. As a result, even if the meshing amount between the first tooth portion 72G and the second tooth portion 73G is set small, or even if the urging force of the coil spring 74 is set small, a reliable transmission state is possible, and the switching mechanism 7, 17 can be further reduced in size and weight.

  (7) Since the first tooth portion 72G and the second tooth portion 73G have inclined portions that mesh with each other in the direction of the rotation center axis 7J, the switching mechanism 7, 17 can be smoothly transmitted and not transmitted. Switching is possible.

(Modification)
In addition, you may change the said embodiment as follows.
In the above embodiment, the first gears 71 and 171 are configured to mesh with the drive units 6 and 16, and the second gears 72 and 172 are configured to mesh with the transmission units 8 and 9, but the first gears 71 and 171 are configured. May be configured so that the second gears 72 and 172 mesh with the drive units 6 and 16.

  The driving units 6 and 16 of the above embodiment are configured by a manual type that generates a driving force when the dials 61 and 161 are operated by a user, but constitute an electric driving unit including a motor or the like, You may comprise so that this drive part may generate drive force with electric power.

  In the embodiment, the coil spring 74 is used as the urging portion, but a leaf spring or the like may be configured as the urging portion.

  The projector 1 of the embodiment uses the transmissive liquid crystal light valve 43 as the light modulation device, but may use a reflective liquid crystal light valve. Further, a device using a micromirror array or the like as the light modulation device may be used.

  The light source 311 is not limited to a discharge lamp, and may be a solid light source such as a lamp of another type or a light emitting diode.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... Exterior housing, 3 ... Optical unit, 5 ... Lens shift mechanism, 6, 16 ... Drive part, 7, 17 ... Switching mechanism, 7J ... Rotation center axis, 8, 9 ... Transmission part, 36 ... Projection lens, 36j ... optical axis, 51 ... first movable part, 61, 161 ... dial, 62, 162 ... drive gear, 71, 171 ... first gear, 72, 172 ... second gear, 72G ... first tooth part 73 ... Switching member, 73G ... Second tooth part, 74 ... Coil spring, 711 ... Tooth mold forming part, 712 ... Projection part, 713 ... Storage part.

Claims (5)

A projector having a projection lens and a lens shift mechanism for moving the projection lens,
The lens shift mechanism is
A movable part that supports the projection lens and is movable in a direction perpendicular to the optical axis of the projection lens;
A drive unit having a drive gear and generating a drive force for moving the movable unit;
A switching exchange mechanism,
A transmission unit that transmits the driving force transmitted by the switching mechanism to the movable unit;
With
The switching mechanism is
A first gear meshing with one of the drive unit and the transmission unit;
A second gear having the same rotation center axis as the first gear and meshing with the other of the drive unit and the transmission unit;
Said first have the same rotation axis and gear switching member that will be movably disposed on the rotation center axis direction between the second gear and the first gear,
A biasing portion that biases the switching member toward the second gear;
With
The first gear includes a first tooth mold forming part formed with a tooth mold that meshes with either the drive gear or the transmission part, and the first tooth mold forming part centered on the rotation center axis. A cylindrical first protrusion that protrudes to the side opposite to the side on which the second gear is disposed and is provided with a storage portion that stores the biasing portion, and the rotation center axis of the first protrusion is the center. A cylindrical guide portion extending to the first tooth mold forming portion side,
It said second gear, on the side facing the switching member, and a second tooth die forming section that have a first tooth portion disposed on a circumference around the rotation center axis, the second tooth have a second protrusion cylindrical projecting from the first tooth portion of the mold forming portion so as to face the guide portion about said rotational axis,
The switching member includes a flange portion formed with a second tooth portion that meshes with the first tooth portion by an urging force of the urging portion, and the rotation center on the opposite side of the flange portion to the second tooth portion. A cylindrical portion protruding around an axis, and a slit formed along the rotational central axis in the cylindrical portion ;
The switching mechanism is
In the movable range of the movable portion, the first gear and the second gear rotate together in a state where the first tooth portion and the second tooth portion mesh with each other, and the driving force is applied to the first gear and the second gear portion. A transmission state transmitted from one of the second gears to the other;
When the driving force is generated by reaching the limit of the movable range, the switching member moves in a direction away from the second gear against the urging force of the urging portion by the driving force. Accordingly, one of the first gear and the second gear meshing with the driving portion is rotated, and the other rotation meshing with the transmitting portion is restricted, and the driving force is transmitted to the first gear and the second gear. while the non-transmission state not to transmit to the other from the possess,
The first gear has a protrusion that engages with a slit formed in the cylindrical portion of the switching member;
The guide part of the first gear and the second protrusion part of the second gear are inserted into the cylindrical part of the switching member, and are engaged with the slit of the switching member by the protrusion part of the first gear. The switching member is locked in the rotation direction by the first gear, and rotates together with the first gear as the first gear rotates . The projector according to claim 1,
The driving unit generates a driving force when manually operated. The projector according to claim 2,
Projector said drive unit includes a dial rotationally operated, the drive gear, characterized that you and coaxial rotation center axis of the dial. It is a projector as described in any one of Claims 1-3, Comprising:
The first tooth portion and the second tooth portion have a flat surface that meshes with each other. It is a projector as described in any one of Claims 1-4, Comprising:
The projector according to claim 1, wherein the first tooth portion and the second tooth portion have inclined portions that mesh with each other in the rotation center axis direction.

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