TWI454823B - A projector - Google Patents

Description

Projection device

The present invention is a projection apparatus, and more particularly to a projection apparatus of a movable lens.

The projector has become a kind of multimedia playback tool, and is also commonly used in most homes, and the general projector must adjust the position of the projected image on the projection screen (imaging surface) by using a projector. Move the position of the projector to adjust the image to the appropriate or specified position, but if the space for the projector is limited, or if the position is inconvenient to be moved arbitrarily, for example, placed in a higher position, the image will be caused. The inconvenience of position adjustment.

Later, some projectors were developed to use lens movement to control the position of the image projected by the lens on the imaging surface. The way to control the movement of the lens is generally manual control and electric control, among which the manual control mode projector In the lens shift design, there is a single axial movement (usually moving up and down), or a two-axis movement (up and down and left and right movement), however, either way, there will be a lens hitting the wall. Shortcomings. More specifically, when designing the optimal range of movement of the lens, the machine member is regarded as a "wall" as the limit of the movable stroke of the lens. If the user does not notice that he has moved to the "wall", the movement is moved. The limit, if it continues to exert force, may cause the components and gears to become stuck, even the collapse of the gears and the damage of the motor, resulting in damage to the device. In addition, the projector using the electric control mode is currently designed to have a single axial movement, mainly at the limit position of the movable stroke of the lens, and when the lens touches the switch, the lens movement can be controlled. The action stops. However, if the projector is used for two-axis movement of the lens, if the detection of a few switches is used, the detection accuracy will be reduced. If more switches need to be installed at the detection position. In order to improve the accuracy of detection, it is bound to increase the component cost. Because the range of lens movement is not only an axial up and down or left and right movement, but an area enclosed by the upper and lower left and right movable stroke limits of the lens, therefore, if you want to control by means of a switch, it is necessary to More switches are placed on the boundaries of this area, which will not only cause design difficulties, but also increase the cost of manufacturing.

In order to improve the above disadvantages, the present invention provides a projection apparatus including a lens moving portion, the lens moving portion further includes a base having a through hole and a lens barrel driven by a first driving module to generate movement. The projection device further includes: an inductive component for generating an inductive signal and a processor when the lens barrel is in contact with the inner edge of the through hole of the base, corresponding to the sensing signal, and controlling the first driving module to stop driving The lens barrel moves.

The projection device of the present invention uses an inductive component to generate an inductive signal when the lens contacts the inner edge of the base through hole to indicate that the lens has reached the limit position of the movable stroke, and is controlled by the processor according to the sensing signal. The lens of the image device stops moving. Therefore, the projection device of the present invention can automatically stop moving when the lens moves in a two-dimensional direction to reach a limit position at which the lens of the projection device can move, so that the lens can be prevented from moving. The stroke occurs to prevent component damage or malfunction. In addition, the sensing element in the present invention adopts a piezoelectric element, a copper foil or a flexible circuit board, and is installed on the inner edge of the through hole of the base, so that the occurrence of overtravel can be effectively and correctly prevented, and The advantage of reducing the number of sensing elements used.

The above and other objects, features, and advantages of the present invention will become more apparent and understood.

Please refer to FIG. 1, which is a block diagram of components of a projection apparatus according to an embodiment of the present invention. The embodiment of the present invention is a projection device. The projection device includes a lens moving portion 101, an inductive component 102, an alerting unit 103, and a processor 104.

FIG. 2 is a schematic structural diagram of the lens moving portion of the projection apparatus according to the embodiment of the present invention, for illustrating the structural composition of the lens moving unit 101. FIG. 3 is a schematic structural view of the lens moving portion after the projection device hides a lens barrel according to an embodiment of the present invention.

Referring to FIG. 2 and FIG. 3, the lens moving portion 101 includes a base 1011 having a through hole 1018, a first bead 1012a and a second bead 1012b. The first direction is parallelly locked to the base. 1011, to form a first trench, a first moving platform 1013, mounted on the base 1011, and slidable or movable in the first groove along the first direction, a third bead 1012c and a The fourth bead 1012d is attached to the first moving platform 1013 in a second direction to form a second groove and a second moving platform 1014. The first moving platform 1013 is mounted on the first moving platform 1013. The second direction is slid or moved in the second slot, a first driving module 1015 is configured to drive the first mobile platform 1013 to move, and a second driving module 1016 is configured to drive the second mobile platform 1014. Moving, and a lens barrel 1017 for projecting an image beam, wherein the lens barrel 1017 passes through the through hole 1018 of the base 1011 and the first and second moving platforms 1014, and is locked to the second moving platform 1014. .

In the embodiment of the present invention, the first and second driving modules 1016 further include a motor, a screw, and a slider. When the first and second driving modules 1016 are to drive the first and second moving platforms 1014 to perform corresponding movements, after receiving the control signal, the motor starts the rotation of the rotor of the motor, and the gears of the rotor are transmitted through the gears. The driving of the group drives the screw to rotate, and the slider mounted on the screw linearly moves along the axial direction of the screw due to the rotation of the screw, and the slider is connected with the first or second moving platform 1014, therefore, The first or second mobile platform 1014 is responsible for the movement of the slider. Therefore, by the above manner, the first moving platform 1013 and the second moving platform 1014 can be moved in the corresponding first direction and/or the second direction, so that the lens barrel 1017 can be adjusted to generate displacement. Change the position of the projected image.

Referring to FIG. 1 , the sensing component 102 of the projection apparatus of the embodiment of the invention is configured to generate an inductive signal when the lens barrel reaches a limit position of movement.

The alert unit 103 sends a warning message according to a warning signal.

A processor 104, corresponding to the sensing signal, controls the driving module to stop driving the lens barrel to move, and sends the warning signal.

More specifically, the sensing element 102 is mounted on the lens barrel 1017 to move to the extreme position of the projection lens, and the sensing element 102 is in contact with the lens barrel 1017 at the extreme position to generate the sensing element. a signal to indicate that the movement of the lens barrel 1017 has reached the limit position, and the sensor signal is compared by the processor 104 to determine whether the sensing signal value exceeds a predetermined value by the generation and output of the sensing signal to the processor 104. And when the predetermined value is exceeded, a control signal is sent to the first and second driving modules 1016 to control the lens barrel 1017 to stop moving in the original direction, and the processor 104 sends the warning signal to the warning unit. After receiving the warning signal, the warning unit 103 generates an alert operation, for example, displaying a warning message in the projected image or using a warning light to indicate the warning message to inform the user of the lens movement of the projection device. Has reached the limit position.

4 is a front view of a lens moving portion according to a first embodiment of the present invention. FIG. 4 only shows the base 1011 and the lens 1017 of the lens moving portion 101 for explaining the mounting of the sensing element 102. position.

In the first embodiment of the present invention, the sensing element 102 is a piezoelectric element that surrounds the inner edge of the through hole 1018 of the base 1011. When the lens barrel 1017 moves to the through hole of the base 1011, When the position of the inner edge of 1018 is the lens movable limit position of the projection device, the outer cylinder surface of the lens barrel 1017 is in contact with the piezoelectric element wound around the inner edge of the through hole 1018 of the base 1011, when the lens barrel 1017 continues to move to cause pressure at a position where the outer cylinder surface of the lens barrel 1017 contacts the piezoelectric element, so that the piezoelectric element is pressed, so that the value of the induced signal output is proportional to the magnitude of the pressure. When the processor 104 receives the sensing signal, comparing whether the sensing signal value exceeds a predetermined value, when the sensing signal value exceeds the predetermined value, the processor 104 sends a control signal to control the first and second driving. The module 1016 stops driving the first and second moving platforms 1014 to continue moving in the original moving direction. Similarly, referring to FIG. 5, the piezoelectric element can also be mounted around the outer cylinder surface of the lens barrel 1017, and the same effect can be achieved.

In the second embodiment of the present invention, the sensing element 102 is a conductive element, such as a copper-platinum sheet, a flexible circuit board, and the conductive element is surrounded by an outer cylinder surface mounted on the lens barrel 1017, and the material of the base 1011 It is a conductive material in which one of the conductive elements and the susceptor 1011 is grounded, and the other is connected to a high level pin of the processor 104. When the lens barrel 1017 continues to move to make the conductive element on the lens barrel 1017 contact the inner edge of the through hole 1018 of the base 1011, the high-level position of the processor 104 is caused by the lens barrel 1017 and the The contact of the pedestal 1011 is turned on to ground, and an inductive signal from a high level to a low level is generated at the high level position. When receiving the sensing signal, the processor 104 sends a control signal to control the first and second driving modules 1016 to stop driving the first and second mobile platforms 1014 to continue moving in the original moving direction.

Incidentally, in the second embodiment of the present invention, the pedestal 1011 may be made of a non-conductive material, and another conductive material may be disposed on the inner edge of the through hole 1018 of the susceptor 1011.

The present invention has been disclosed in the above several embodiments, but it is not intended to limit the scope of the present invention, and those skilled in the art can make some modifications and retouchings without departing from the spirit and scope of the present invention. The scope of the present invention is defined by the scope of the appended claims. FIG. 4 is a circuit diagram of an embodiment of the present invention.

101‧‧‧Lens moving department

102‧‧‧Inductive components

103‧‧‧Warning unit

104‧‧‧Processor

1011‧‧‧Base

1012a‧‧‧First layering

1012b‧‧‧second bead

1012c‧‧‧3rd layer

1012d‧‧‧4th layer

1013‧‧‧First mobile platform

1014‧‧‧ Second mobile platform

1015‧‧‧First drive module

1016‧‧‧Second drive module

1 is a block diagram of components of a projection apparatus according to an embodiment of the present invention.

2 is a schematic structural view of the lens moving portion of the projection apparatus according to the embodiment of the present invention.

FIG. 3 is a schematic structural view of the lens moving portion after the projection device hides the lens barrel according to the embodiment of the present invention.

Figure 4 is a front elevational view of the lens moving portion of the first embodiment of the present invention.

Figure 5 is a front elevational view of the lens moving portion of the first embodiment of the present invention.

101‧‧‧Lens moving department

102‧‧‧Inductive components

103‧‧‧Warning unit

104‧‧‧Processor

Claims (12)

A projection device includes a lens moving portion, comprising: a base having a through hole; and a lens barrel driven by a first driving module, the projection device comprising: an inductive component for the mirror When the cylinder is in contact with the inner edge of the through hole of the base, an inductive signal is generated; a processor corresponding to the sensing signal controls the first driving module to stop driving the lens barrel to move. The projection device of claim 1, wherein the sensing element comprises a piezoelectric element. The projection device of claim 1, wherein the sensing element is mounted on an inner edge of the through hole of the base. The projection device of claim 3, wherein the sensing element is surrounded by an inner edge of the through hole of the base. The projection device of claim 2, 3 or 4, wherein the processor further comprises controlling the first driving module to stop driving the lens barrel when the sensing signal value is higher than a predetermined value. The projection device of claim 1, wherein the base is a conductive material, and the sensing element comprises a conductive element. The projection device of claim 6, wherein the sensing element is mounted on an outer cylinder surface of the lens barrel. The projection device of claim 7, wherein the sensing element comprises a first conductive element, and the base further comprises a second conductive element mounted on the inner edge of the through hole. The projection device of claim 6 or 8, wherein the processor further comprises controlling the driving module to stop driving the lens barrel when receiving the sensing signal value. The projection device of claim 1, further comprising: a first mobile platform coupled to the first driving module, slidably mounted on the base, wherein the first driving module drives the first A mobile platform moves in the first direction on the base. The projection device of claim 10, further comprising: a second mobile platform coupled to a second driving module, slidably mounted on the first mobile platform, wherein the second driving module is driven The second mobile platform moves in the second direction on the first mobile platform. The projection device of claim 1, further comprising an alerting unit for performing an alerting operation according to a warning signal, wherein the processor further comprises a corresponding sensing signal to issue the warning signal.