Mobile projector

Abstract

A mobile projector is disclosed. The mobile projector comprises: a main body; a plurality of wheels for moving the main body; a light source unit for emitting light; a plurality of lens units having different light projection directions; a driving unit for adjusting positions of the plurality of lens units; and a processor for, when the main body is moved and a projection surface on which the light is projected is changed, controlling the driving unit to adjust a position of a lens unit having a projection direction corresponding to a projection surface, among the plurality of lens units to, a transmission position on a light traveling path.

Description

portable projector

[0001] The present disclosure relates to a mobile projector.

[0002] A projector is a device that projects image information onto a projection surface and can be called an image output device or image display device.

[0003] A projector can receive image information from an electronic device such as a computer and project light onto a projection surface to create an image.

[0004] A projector typically has a light source that generates light according to image information and a lens that transmits the light generated from the light source and projects it externally.

[0005] As technology advances, projectors have become smaller and lighter, and portable projectors have become commercialized. Recently, robotics technology has been integrated to develop portable projectors.

[0006] As the projector moves, the projection surface may change. For example, it may shift from projecting on a wall to projecting on the floor. This can degrade image quality, so it's important to prevent this.

[0007] According to at least one embodiment of the present disclosure, a mobile projector may include a main body, at least one wheel for moving the main body, a light source unit that emits light and moves together with the main body, a plurality of lens units having different directions for projecting the light, a driving unit for adjusting positions of the plurality of lens units, and a processor that controls the driving unit to adjust a position of a lens unit among the plurality of lens units having a projection direction corresponding to the changed projection surface when the main body is moved by the at least one wheel and the projection surface is changed to a transmission position on the light path.

[0008] The plurality of lens units may include a first lens unit that projects light upward relative to the light source unit and a second lens unit that projects light downward relative to the light source unit.

[0009] The above processor can control the driving unit to adjust the position of the first lens unit to the transmission position if the changed projection surface is a wall surface.

[0010] The above processor can control the driving unit to adjust the position of the second lens unit to the transmission position if the changed projection surface is the floor surface.

[0011] The first lens unit and the second lens unit can be stacked vertically.

[0012] The driving unit may include a base for supporting the light source unit and the plurality of lens units, a fixing member for fixing one of the plurality of lens units to the transmission position and located on the upper side of the base, and a motor provided on one side of the base.

[0013] The above base may include a base top to which the plurality of lens units are combined, and a base bottom to which the light source unit is combined.

[0014] The above base top can be installed so as to be able to move up and down.

[0015] The above base top may further include a plurality of mounting portions that are relatively corresponding to the plurality of lens units and are relatively coupled to the plurality of lens units.

[0016] Each of the plurality of mounting portions may include a hole penetrating the base top in the thickness direction.

[0017] The above driving unit may further include a balance member having the same shape as the above fixed member.

[0018] The above driving unit may include a guide member coupled to the base top to support the fixed member.

[0019] It may include a first gear coupled to the motor to transmit the driving force of the motor to the base top.

[0020] The above guide member can be coupled to one side of the base top.

[0021] The above guide member may include a guide surface for moving the fixed member and a second gear that engages with the first gear, and when driving force is transmitted to the first gear, the second gear moves by the movement of the first gear, and thus moves the base top by the movement of the second gear.

[0022] The guide surface may include a first surface extending from one side of the guide member, a second surface protruding from the first surface toward the light source unit and tapering upward, a third surface extending from the second surface parallel to one side of the base top, a fourth surface tapering downward away from the light source unit from the third surface, and a fifth surface extending from the fourth surface parallel to one side of the base top.

[0023] The above first gear may be a pinion gear and the above second gear may be a rack gear.

[0024] The above driving unit may include a guide rail for guiding the movement path of the base top.

[0025] The above guide rail can be placed between the base top and the base bottom.

[0026] The above-mentioned fixed member may include a pin that comes into contact with the guide surface, an elastic member coupled to one side of the pin so that the pin moves away from the guide surface when an external force is applied, and a cover coupled to one end of the elastic member.

[0027] The above base top may include a fixing groove having a shape corresponding to the pin.

[0028] The above-mentioned fixing groove may include a first fixing groove on the lower side of the base top and a second fixing groove above the first fixing groove.

[0029] The above first fixed groove may be coaxial with the connection point of the first surface and the second surface.

[0030] The above second fixed groove may be coaxial with the connection point of the fourth surface and the fifth surface.

[0031] The above pin may include a cylindrical body portion and a protrusion extending outward from one surface of the cylindrical body portion.

[0032] The above protrusion may have a T-shaped cross-section, and may include a catch plate that moves along the guide surface and is in contact with the guide surface, and a fixing plate that is seated in the fixing groove and has a shape corresponding to the fixing groove and is orthogonal to the catch plate.

[0033] FIG. 1 is a perspective view of a mobile projector according to an embodiment of the present disclosure.

[0034] FIG. 2 is an exploded view showing a state in which a plurality of wheels of a mobile projector according to one embodiment of the present disclosure are separated from the main body.

[0035] FIG. 3 is an exploded view of the main body of a mobile projector according to an embodiment of the present disclosure.

[0036] FIG. 4 is an exploded view of a light source unit of a mobile projector according to an embodiment of the present disclosure.

[0037] Figure 5 is a schematic drawing showing a cross-section along line A-A' of Figure 1.

[0038] FIG. 6 is an exploded view of a lens unit of a mobile projector according to an embodiment of the present disclosure.

[0039] FIG. 7 and FIG. 8 are drawings for explaining the projection angle of light of each of the plurality of lens units of the mobile projector according to one embodiment of the present disclosure.

[0040] FIG. 9 is a block diagram showing a part of a configuration of a mobile projector according to an embodiment of the present disclosure.

[0041] FIG. 10 is an exploded view of a drive unit of a mobile projector according to an embodiment of the present disclosure.

[0042] FIG. 11 is a rear view of a base bottom according to one embodiment of the present disclosure.

[0043] FIG. 12 is an enlarged exploded view of a fixing member according to one embodiment of the present disclosure.

[0044] FIG. 13 and FIG. 14 are drawings showing a fixing member of a mobile projector according to one embodiment of the present disclosure being mounted on a base top.

[0045] FIG. 15 and FIG. 16 are schematic drawings showing how light is projected from an image output module when multiple lens units of a mobile projector according to an embodiment of the present disclosure are located at different positions.

[0046] FIG. 17 is a perspective view of a guide member and a guide bracket according to one embodiment of the present disclosure.

[0047] FIG. 18 is a drawing showing a state in which a guide member according to one embodiment of the present disclosure is coupled to a base top.

[0048] FIG. 19 is a drawing for explaining a portion of a base top and a guide member in a combined state according to one embodiment of the present disclosure.

[0049] FIG. 20 is a drawing for explaining a process in which a fixing member is compressed by a guide member according to one embodiment of the present disclosure.

[0050] FIGS. 21 to 24 are drawings for explaining how the position of the base top is changed by the operation of the first gear and the second gear according to one embodiment of the present disclosure.

[0051] FIG. 25 is a drawing for explaining a balance member according to one embodiment of the present disclosure.

[0052] FIG. 26 is a flowchart for explaining the operation of a projector according to one embodiment of the present disclosure.

[0053] It should be understood that the various embodiments and terms used in this document are not intended to limit the technical features described in this document to specific embodiments, but rather to include various modifications, equivalents, or substitutes of the embodiments.

[0054] In connection with the description of the drawings, similar reference numerals may be used for similar or related components.

[0055] The singular form of a noun corresponding to an item may include one or more of said items, unless the relevant context clearly indicates otherwise.

[0056] In this document, each of the phrases "A or B", "at least one of A and B", "at least one of A or B", "A, B, or C", "at least one of A, B, and C", and "at least one of A, B, or C" may include any one of the items listed together in that phrase, or all possible combinations thereof.

[0057] The term "and / or" includes any combination of a plurality of related described elements or any one of a plurality of related described elements.

[0058] Terms such as "first," "second," or "first" or "second" may be used simply to distinguish one component from another and do not qualify the components in any other respect (e.g., importance or order).

[0059] When a component (e.g., a first component) is referred to as being "coupled" or "connected" to another component (e.g., a second component), with or without the terms "functionally" or "communicatively," it means that the component can be connected to the other component directly (e.g., wired), wirelessly, or through a third component.

[0060] The terms "include" or "have" are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in this document, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0061] When a component is said to be “connected,” “coupled,” “supported,” or “in contact with” another component, this includes not only cases where the components are directly connected, coupled, supported, or in contact, but also cases where the components are indirectly connected, coupled, supported, or in contact through a third component.

[0062] When we say that a component is "on" another component, this includes not only cases where the component is in contact with the other component, but also cases where there is another component between the two components.

[0063] Below, a mobile projector according to various embodiments is specifically described with reference to the attached drawings.

[0064] Fig. 1 is a perspective view of a mobile projector according to an embodiment of the present disclosure. Fig. 2 is an exploded view showing a state in which a plurality of wheels of a mobile projector according to an embodiment of the present disclosure are separated from the main body.

[0065] Referring to FIGS. 1 and 2, a mobile projector (1) may include a main body (10) and a plurality of wheels (20).

[0066] A mobile projector (1) is an image output device that can move on its own. Conventional projectors are implemented in a form that allows a user to mount the projector in a specific location and project images onto a fixed projection surface. However, the mobile projector (1) of the present disclosure includes a moving unit (not shown) with multiple wheels (20), thereby enabling the projector to be moved to various locations in spaces such as a home or office and project images.

[0067] In the present disclosure, the projection surface may be the surface on which an image projected from a mobile projector (1) is formed. If a dedicated projector screen is provided in a home or office, the screen may be utilized as the projection surface. However, various external objects, such as a wall, ceiling, floor, or the side of an object, may also be utilized as the projection surface. As the mobile projector (1) moves, the projection surface may change in various ways.

[0068] Hereinafter, the projector (1) means the same device as the mobile projector (1).

[0069] The main body (10) is a configuration for forming the exterior of the projector (1). In Fig. 1, the main body (10) is illustrated as having a roughly hollow cylindrical shape, but the shape of the main body (10) can be changed in various ways. For example, it can be implemented in a flat shape that adheres to the floor surface, or it can be implemented in a stand shape that is elongated in the vertical direction.

[0070] One side of the main body (10) may be formed to be openable. The main body (10) may include an image output module (100, see FIG. 3) therein.

[0071] The image output module (100) can be installed in the main body (10) so as to output an image in an upward or downward inclined direction with respect to a horizontal plane.

[0072] The image output module (100) can be formed to project an image onto a screen erected on the ground, a wall, or the ground.

[0073] The video output module (100) will be described in detail in FIG. 3 and below.

[0074] The main body (10) may include a projection hole (11) so that an image output from the image output module (100) can be projected to the outside of the main body (10). The projection hole (11) may be formed toward the front (+Y direction) of the main body (10). The projection hole (11) may be formed on the same axis as the horizontal plane.

[0075] A plurality of wheels (20) are configured to move the main body (10). The plurality of wheels (20) may be installed on the left and right sides of the main body (10), one each. The plurality of wheels (20) may include a left wheel (21) installed on the left side of the main body (10) and a right wheel (22) installed on the right side of the main body (10). The left wheel (21) and the right wheel (22) may be installed symmetrically. Alternatively, the left wheel (21) and the right wheel (22) may be formed identically.

[0076] The left wheel (21) and the right wheel (22) can be installed rotatably on the main body (10). Specifically, although not shown in the drawing, the left wheel (21) and the right wheel (22) can be coupled to a moving motor by a wheel shaft.

[0077] The left wheel (21) and the right wheel (22) may be covered by a wheel cover (30). In other words, the wheel cover (30) may be installed on the outer side opposite to the side where the left wheel (21) and the right wheel (22) are coupled to the main body (10). The wheel cover (30) may include a left wheel cover (31) and a right wheel cover (32). The wheel cover (30) may be formed to have a shape corresponding to one side of the main body (10). In other words, the outer peripheries of the main body (10) and the wheel cover (30) may be a part of the outer periphery of a sphere having the same center point and the same diameter.

[0078] Meanwhile, a first angle adjustment hole (12) may be formed on the side of the main body (10) where the left wheel (21) and the right wheel (22) are installed.

[0079] The main body (10) can be rotated in the pitch direction so that the position of the projection hole (11) changes depending on the direction in which the image is to be projected. In this case, if the area where the wheel shaft connecting the left wheel (21) and the right wheel (22) to the main body (10) penetrates the main body (10) is limited to an area corresponding to the cross-sectional area of ​​the wheel shaft, the rotation radius of the main body (10) may be limited.

[0080] The first angle adjustment hole (12) can be formed in an area corresponding to a preset rotation radius of the main body (10). That is, the first angle adjustment hole (12) can be formed so that the wheel shaft does not collide with the main body (10) when the main body (10) rotates by the preset radius.

[0081] In addition, although FIG. 1 illustrates a case where two wheels (20) are arranged on both sides of the main body (10), the number, size, shape, etc. of the wheels (20) may also be varied. For example, FIG. 1 illustrates a case where the wheels (20) are built into the main body (10) so that one area of ​​the side surface is not exposed, but if implemented in a form attached to both sides of the main body (10), the side surface of the wheels (20) may be entirely exposed.

[0082] The plurality of wheels (20) may include at least one auxiliary wheel (23, see FIG. 5). The auxiliary wheel (20) is configured to support the load of the main body (10). The auxiliary wheel (23) may be installed at the rear (-Y direction) of the main body (10).

[0083] The auxiliary wheel (23) can be connected to the main body (10) by an auxiliary wheel arm (231).

[0084] The auxiliary wheel arm (231) may be formed to penetrate the main body (10). That is, a second angle adjustment hole (not shown) through which the auxiliary wheel arm (231) penetrates may be formed in the main body (10).

[0085] The main body (10) can be rotated in the pitch direction so that the position of the projection hole (11) changes depending on the direction in which the image is to be projected. The second angle adjustment hole can be formed with a length corresponding to the rotation radius of the main body (10).

[0086] Since the auxiliary wheel arm (231) is arranged to penetrate the main body (10) through the second angle adjustment hole, even if the main body (10) rotates, the auxiliary wheel arm (231) and the main body (10) do not collide, so the main body (10) can rotate freely.

[0087] The projector (1) includes a main body (10) on which a plurality of wheels (20) are installed, so that it is not fixed to a position initially set by the user, but can move to an input projection position and output an image at a specific angle on a specific projection surface.

[0088] A plurality of wheels (20) can move the main body (10) by rotating under the driving of a motor. When wheels (20) are arranged on both sides of the main body (10), the rotational speed of the wheels on both sides can be varied to change the travel path of the main body (10).

[0089] Fig. 3 is an exploded view of the main body of a mobile projector according to an embodiment of the present disclosure. Fig. 4 is an exploded view of the light source unit of a mobile projector according to an embodiment of the present disclosure.

[0090] Referring to FIG. 3, an image output module (100) may be installed inside the main body (10). The image output module (100) may be coupled to the inner surface of the main body (10).

[0091] The image output module (100) may include a light source unit (200), a lens unit (300), and a driving unit (400).

[0092] The image output module (100) can receive image data from an external device and output light corresponding to the received image data. The image output module (100) can project light onto a projection surface through a projection hole (11) of the main body (10). The light output from the image output module (100) can be implemented as an image on the projection surface.

[0093] The image output module (100) can project light upward from the main body (10). Alternatively, the image output module (100) can project light downward from the main body (10).

[0094] The light source unit (200) is a configuration for emitting light. Referring to FIG. 4, the light source unit (200) may include a lamp (210) and a lamp support member (220). The lamp (210) may be powered and output light. The lamp (210) may be implemented with an LED, a laser, or the like, and the type of light source is not necessarily limited to those described. For example, the lamp (210) may be implemented by combining an LED and a laser. The lamp (210) may be coupled to the lamp support member (220).

[0095] The lamp support member (220) is configured to secure the lamp (210) to the main body (10). The lamp support member (220) may be formed to extend in the Y-axis direction inside the main body (10). One side of the lamp support member (220) may be coupled to the driving unit (400).

[0096] Again, referring to FIG. 3, the lens unit (300) is configured to enlarge the projection angle of light output from the light source unit (200). The lens unit (300) may include a plurality of lens units (310, 320) that project the light output from the light source unit (200) in different directions.

[0097] The lens unit (300) may include a first lens unit (310) that projects light upward based on the light source unit (200).

[0098] Additionally, the lens unit (300) may include a second lens unit (320) that projects light downward based on the light source unit (200).

[0099] The first lens unit (310) and the second lens unit (320) can be arranged in a vertical stack.

[0100] The first lens unit (310) and the second lens unit (320) can be coupled to the driving unit (400). A detailed description of the lens unit (300) will be described later.

[0101] The driving unit (400) is configured to allow the lens unit (300) to move. Specifically, the driving unit (400) is configured to allow the lens unit (300) to move up and down on the Z-axis.

[0102] In other words, the driving unit (400) is configured to adjust the positions of multiple lens units (310, 320).

[0103] The driving unit (400) may be arranged to be coupled to the inner surface of the main body (10). By coupling the driving unit (400) to the main body (10), the load of the light source unit (200) and the lens unit (300) coupled to the driving unit (400) can be transmitted to the main body (10).

[0104] Fig. 5 is a schematic drawing showing a cross-section taken along line A-A' of Fig. 1. Fig. 6 is an exploded view of a lens unit of a mobile projector according to an embodiment of the present disclosure.

[0105] Figure 5 shows the positions where the light source unit (200), lens unit (300), and driving unit (400) are arranged inside the main body (10).

[0106] Referring to FIG. 5, the light source unit (200) may be positioned at the rear inside the main body (10). The lens unit (300) may be positioned at the front of the main body (10) corresponding to the projection hole (11). The driving unit (400) may be positioned between the light source unit (200) and the lens unit (300).

[0107] The light source unit (200) may be arranged to be parallel to the ground. That is, the lamp support member (220) of the light source unit (200) may be arranged to be parallel to the Y-axis. Accordingly, the light output from the lamp (210) may be output parallel to the Y-axis.

[0108] The lens unit (300) can be controlled so that at least one of the plurality of lens units (310, 320) is positioned on the same axis as the light source unit (200). In other words, the position of at least one of the first lens unit (310) or the second lens unit (320) can be controlled so that it projects light output from the lamp (210) to the outside of the main body (10) through the projection hole (11).

[0109] In order for the lens unit (300) to project the light output from the light source unit (200), the lens unit (300) must be positioned at a transmission position on the path of light output from the lamp (210).

[0110] Here, the transmission position may refer to the position where the lens should be positioned within the path of light output from the lamp (210). As light passes through the lens, the image may be enlarged or reduced, and the focus may also be adjusted, depending on the magnification of the lens. Furthermore, the direction in which the light is refracted and projected externally may vary depending on the arrangement of the lens.

[0111] A detailed description of the position control of the lens unit (300) will be described later.

[0112] Referring to FIG. 6, the lens unit (300) may include a first lens unit (310) and a second lens unit (320). The first lens unit (310) and the second lens unit (320) may include different lenses so that the directions in which light output from the light source unit (200) is projected are different.

[0113] For example, the first lens unit (310) may have a lens for projecting light onto a projection surface at a further distance than the second lens unit (320).

[0114] In other words, the first lens unit (310) may be referred to as a long-distance projection lens, and the second lens unit (320) may be referred to as a short-distance projection lens.

[0115] The first lens unit (310) and the second lens unit (320) can be arranged in a vertical stacking manner. Specifically, the first lens unit (310) and the second lens unit (320) can be coupled to the drive unit (400) so as to be vertically stacked in the Z-axis direction.

[0116] As the driving unit (400) operates, light can be projected onto one of the lens units, either the first lens unit (310) or the second lens unit (320).

[0117] FIG. 7 and FIG. 8 are drawings for explaining the projection angle of light of each of the plurality of lens units of the mobile projector according to one embodiment of the present disclosure.

[0118] Referring to FIGS. 7 and 8, the first lens unit (310) and the second lens unit (320) may project light output from the lamp (210) in different directions.

[0119] Each of the first lens unit (310) and the second lens unit (320) may be implemented as a lens assembly having at least one lens combined therein. Depending on the arrangement position or angle of the lenses within the first lens unit (310) and the second lens unit (320), the direction of light projected externally from the first lens unit (310) and the second lens unit (320) may vary.

[0120] Specifically, the first lens unit (310) can project light output from the lamp (210) upward. The second lens unit (320) can project light output from the lamp (210) downward. Here, the upward and downward are determined based on an imaginary axis (P) that passes through the lamp (210) of the light source unit (200) and is parallel to the ground. Specifically, the direction toward the ground based on the axis (P) may be downward, and the direction opposite to the ground based on the axis (P) may be upward.

[0121] The first lens unit (310) may be configured to project light output from the lamp (210) onto a wall surface. The second lens unit (320) may be configured to project light output from the lamp (210) onto a floor surface.

[0122] In other words, when the first lens unit (310) is at a transmission position on the path of light output from the lamp (210), the projector (1) can project an image on a projection surface located in front of the projector (1).

[0123] In contrast, when the second lens unit (320) is located at a transmission position on the path of light output from the lamp (210), the projector (1) can project an image onto the floor surface in front of the projector (1).

[0124] In this way, the projector (1) according to the present disclosure can project images on different projection surfaces as needed by allowing light output from the same light source (e.g., lamp (210)) to be projected in various directions.

[0125] In other words, even if the user does not directly adjust the height of the projector (1), the position of the projector (1) is fixed and images can be projected onto different projection surfaces by only changing the positions of the multiple lens units (300).

[0126] Due to this, it can be convenient to select a projection surface when projecting an image using a projector (1).

[0127] FIG. 9 is a block diagram showing a part of a configuration of a mobile projector according to an embodiment of the present disclosure.

[0128] Referring to FIG. 9, the projector (1) may further include a processor (1000), memory (2000), and sensor (3000).

[0129] The processor (1000) is configured to control the overall operation of the projector (1). Specifically, the processor (1000) can control the driving unit (400) to adjust the positions of multiple lens units (300). In addition, the processor (1000) can control the light output from the light source unit (200) based on image data input from an external device.

[0130] The processor (1000) may be composed of one or more processors (1000). In this case, the one or more processors (1000) may include at least one of a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), and an NPU (Neural Processing Unit), but is not limited to the examples of the processors (1000) described above.

[0131] CPUs are general-purpose processors capable of performing not only general calculations but also artificial intelligence calculations. Their multi-layered cache structure allows for the efficient execution of complex programs. CPUs are advantageous for serial processing, enabling organic linking of previous and subsequent calculation results through sequential calculations. General-purpose processors are not limited to the examples described above, except where specifically identified as CPUs.

[0132] A GPU is a processor designed for large-scale computations, such as floating-point operations used in graphics processing. It integrates a large number of cores to perform large-scale computations in parallel. In particular, GPUs may be advantageous over CPUs in parallel processing methods, such as convolution operations. Furthermore, GPUs can be used as coprocessors to supplement the functions of CPUs. Processors for large-scale computations are not limited to the examples described above, except in cases where they are specifically referred to as GPUs.

[0133] An NPU is a processor specialized in artificial intelligence computation using artificial neural networks, and each layer of the artificial neural network can be implemented in hardware (e.g., silicon). Since NPUs are designed specifically according to the company's specifications, they have less freedom than CPUs or GPUs, but can efficiently process the AI ​​computations requested by the company. Meanwhile, as a processor specialized in AI computation, an NPU can be implemented in various forms, such as a Tensor Processing Unit (TPU), an Intelligence Processing Unit (IPU), or a Vision Processing Unit (VPU). Except as specifically designated as an NPU, an AI processor is not limited to the examples described above.

[0134] Additionally, one or more processors (1000) may be implemented as a System on Chip (SoC). In this case, in addition to one or more processors (1000), the SoC may further include a memory (2000) and a network interface such as a bus for data communication between the processor (1000) and the memory (2000).

[0135] When a plurality of processors (1000) are included in the SoC included in the projector (1), the projector (1) can perform operations related to artificial intelligence (e.g., operations related to learning or inference of an artificial intelligence model) by using some of the plurality of processors (1000). For example, the projector (1) can perform operations related to artificial intelligence by using at least one of a GPU, an NPU, a VPU, a TPU, and a hardware accelerator specialized in artificial intelligence operations such as convolution operations and matrix multiplication operations among the plurality of processors (1000). However, this is merely an example, and it is of course possible to process operations related to artificial intelligence by using a CPU or a general-purpose processor (1000).

[0136] The processor (1000) can control a plurality of wheels (20) to change the position of the projector (1). For example, when a user commands to change the position of the projector (1) by operating a remote control or inputting a voice command or motion command, the processor (1000) drives a plurality of wheels (20) based on the command.

[0137] Map information of a space where a projector (1) is located can be stored in a memory (2000). If the projector (1) is equipped with at least one sensor such as a lidar sensor, a camera, an infrared sensor, an ultrasonic sensor, etc., the processor (1000) can directly generate map information based on sensing data acquired by each sensor while sequentially driving within the space. Alternatively, if the projector (1) includes a communication module, the processor (1000) can receive map information from an external device such as a robot vacuum cleaner or a user's mobile phone through the communication module and store the map information in the memory (2000).

[0138] The processor (1000) controls a plurality of wheels (20) and other components to project an image onto an appropriate projection surface within a space based on map information. Accordingly, the projection surface can be changed.

[0139] In this way, the processor (1000) can control the positions of the plurality of lens units (300) according to the position of the projection surface on which the image is projected.

[0140] When the main body (10) is moved and the projection surface on which light is projected is changed, the processor (1000) can control the driving unit (400) to adjust the position of a lens unit (for example, one of the first lens unit (310) or the second lens unit (320)) having a projection direction corresponding to the projection surface among the plurality of lens units (300) to a transmission position on the light propagation path.

[0141] The position of the projection surface can be sensed by a sensor (3000). The sensor (3000) may be a camera sensor or a lidar sensor, but the type of sensor (3000) is not necessarily limited thereto.

[0142] If the sensor (3000) is a camera sensor, the processor (1000) can analyze an image captured by the camera to determine whether an object included in the image is a wall.

[0143] There are various ways to analyze an image. For example, the processor (1000) can divide the captured image into pixel groups each containing a plurality of pixels. Each pixel group may partially overlap. The processor (1000) extracts a characteristic value for each pixel group. The characteristic value may be detected based on various criteria, such as an average pixel value, a maximum pixel value, or a minimum pixel value of pixels belonging to the corresponding pixel group. The processor (1000) detects the positions of pixel groups having the same or similar characteristic values ​​among adjacent pixel groups. The processor (1000) connects the detected pixel groups to determine the edge of an object included in the captured image. The processor (1000) determines the type, size, shape, etc. of the object based on the positions and number of pixel groups included in the edge, the characteristic values ​​of the pixel groups, etc.

[0144] The processor (1000) can identify whether an object in an image is a wall or a floor by comparing data previously stored in the memory (2000) with characteristic values ​​of pixel groups within an edge.

[0145] In the above, the case of identifying the projection surface using a camera has been described, but it is not necessarily limited to this, and the processor (1000) may also identify the projection surface based on map information and pitch angle, roll angle, yaw angle information of the projector (1).

[0146] For example, if the position of a movable projector (1) within a map is adjacent to a wall, the processor (1000) can identify the yaw angle of the projector (1) to determine whether the movable projector (1) is facing the wall. If the pitch angle of the projector (1) is within a normal range and is facing the wall, the processor (1000) can determine that the projection surface is the wall. On the other hand, if the processor (1000) identifies that the projector (1) is spaced apart from the wall by a certain distance or more and the pitch angle range is an angular range in which the main body of the projector (1) is tilted toward the floor, the processor (1000) can determine that the projection surface is the floor.

[0147] If an AI model learned for projection surface judgment is stored in the memory (2000), or if a communication module capable of communicating with an external server device in which such an AI model is stored is provided, the processor (1000) may also determine the projection surface based on the output value of the AI ​​model.

[0148] If the projection surface is a wall, the processor (1000) can control the driving unit (400) to adjust the position of the first lens unit (310) to a position where light output from the lamp (210) is transmitted.

[0149] When the floor located in front of the projector (1) is sensed by the sensor (3000), the processor (1000) can determine that the projection surface is the floor surface. If the projection surface is the floor surface, the processor (1000) can control the driving unit (400) to adjust the position of the second lens unit (320) to a position where light output from the lamp (210) is transmitted.

[0150] The memory (2000) can store at least one instruction regarding the projector (1). In addition, the memory (2000) can store an O / S (Operating System) and data for driving the projector (1).

[0151] The memory (2000) may include a semiconductor memory such as a flash memory or a magnetic storage medium such as a hard disk. For example, various software modules for operating the projector (1) according to various embodiments of the present disclosure may be stored in the memory (2000), and the processor (1000) may control the operation of the projector (1) by executing the various software modules stored in the memory (2000).

[0152] That is, the memory (2000) is accessed by the processor (1000), and data can be read / written / modified / deleted / updated by the processor (1000).

[0153] The memory (2000) may be provided as a separate configuration from the processor (1000), may be implemented in the form of ROM or RAM placed within the processor (1000), or may be implemented in the form of various external storage media (e.g., micro SD card, memory stick) mounted on the projector (1). In the present disclosure, the memory (2000) may be used to mean all of these forms.

[0154] The memory (2000) may include information for controlling the drive unit (400) to move the plurality of lens units (300). For example, it may include information for the positions of the plurality of lens units (300) corresponding to the positions of the projection surface. For example, if the projection surface is a projection surface that is vertically erected in front of the projector (1), such as a wall, data for controlling the drive unit (400) so that the first lens unit (310) is positioned on the light transmission path may be included, and if the projection surface is a horizontal surface close to the ground in front of the projector (1), such as a floor, data for controlling the drive unit (400) so that the second lens unit (320) is positioned on the light transmission path may be included.

[0155] Data on the positions of a plurality of lens units (300) corresponding to the positions of the projection surface can be set in advance by the manufacturer during the process of manufacturing the projector (1) and stored in the memory (2000).

[0156] Here, information or data may have the same meaning as an instruction. The processor (1000) can control the overall operation of the projector (1) by executing at least one instruction stored in the memory (2000) as described above.

[0157] In addition, the memory (2000) may store the above-described map information or AI model.

[0158] FIG. 10 is an exploded view of a drive unit of a mobile projector according to an embodiment of the present disclosure.

[0159] Referring to FIG. 10, the drive unit (400) may include a base (410), a fixed member (430), and a motor (440).

[0160] The base (410) is configured to support a light source unit (200) and a plurality of lens units (300). The light source unit (200) and a plurality of lens units (300) can be coupled to the base (410).

[0161] The base (410) may include a base top (411) and a base bottom (412). The base top (411) is configured to which a plurality of lens units (300) are coupled. The base bottom (412) is configured to which a light source unit (200) is coupled. The base top (411) may be installed to be able to move up and down on the base bottom (412).

[0162] The base top (411) may include a mounting portion (4111). The mounting portion (4111) is configured to couple a plurality of lens units (300). The mounting portion (4111) may be formed to have a shape corresponding to one surface of each of the first lens unit (310) and the second lens unit (320) so that a plurality of lens units (300) may be mounted thereon.

[0163] The mounting portion (4111) may be formed in the shape of a hole penetrating the base top (411) in the thickness direction. The mounting portion (4111) may be provided in a number corresponding to the number of lens units (300).

[0164] The base top (411) can be formed in a roughly rectangular shape. The base top (411) can be installed on the inside of the base bottom (412).

[0165] The base top (411) may include a base top plate (4112) formed as a rectangular flat plate and a base top wall (4113) extending vertically from an edge of the base top plate (4112).

[0166] A number of mounting portions (4111) can be formed on the base top plate (4112) corresponding to the number of lens units (300).

[0167] A lens receiving portion (4114) may be formed on one side of the base top plate (4112) by the base top wall (4113). The lens receiving portion (4114) may be formed in a shape of approximately a rectangular parallelepiped.

[0168] The base bottom (412) may include a base bottom plate (4121) and a base bottom wall (4122). The base bottom plate (4121) may be formed as a generally rectangular flat plate. The base bottom wall (4122) may be configured to extend vertically from an edge of the base bottom plate (4121).

[0169] A base top receiving portion (4123) capable of receiving a base top may be formed on one side of the base bottom plate (4121) by the base bottom wall (4122). The base top receiving portion (4123) may be formed in a shape of approximately a rectangular parallelepiped.

[0170] The base top plate (4112) may be formed to have a smaller width than the base bottom plate (4121).

[0171] The protrusion length of the base top wall (4113) may correspond to the protrusion length of the base bottom wall (4122).

[0172] Meanwhile, the drive unit (400) may further include a guide rail (420).

[0173] The guide rail (420) is configured to guide the movement path of the base top (411). Specifically, the guide rail (420) is configured to guide the path along which the base top (411) moves up and down in the base top receiving portion (4123).

[0174] A guide rail (420) can be placed between the base top (411) and the base bottom (412).

[0175] The guide rail (420) may include a guide rail top (421) and a guide rail bottom (422).

[0176] The guide rail top (421) is configured to be connected to the base top (411). The guide rail top (421) may include a plurality of holes (4211).

[0177] A plurality of holes (4211) are configured to allow a connecting member (not shown) to be fastened. The plurality of holes (4211) may be formed by protruding and extending from one surface of the guide rail top (421). The connecting member may have a length longer than the protruding length of the plurality of holes (4211).

[0178] The guide rail top (421) can be stably fixed to the base top (411) by a connecting member (not shown) penetrating a plurality of holes (4211).

[0179] In the drawing, a plurality of holes (4211) are shown as being formed in three places on one surface of the guide rail top (421), but the shape and number of the plurality of holes (4211) are not necessarily limited to those shown.

[0180] The guide rail (420) may be provided in two or more pieces. However, the number is not necessarily limited to the number shown in the drawing, and the number of guide rails (420) may be increased or decreased as needed depending on an embodiment.

[0181] The guide rail bottom (422) is configured to be connected to the base bottom (412). The guide rail bottom (422) can accommodate the guide rail top (421). That is, the guide rail top (421) can be accommodated in the guide rail bottom (422) and moved up and down.

[0182] The guide rail bottom (422) can be formed in a number corresponding to the number of guide rail tops (421). In addition, the guide rail bottom (422) can be provided at a position corresponding to the guide rail top (421).

[0183] The guide rail top (421) may be formed with a length corresponding to the height of the base top (411), and the guide rail bottom (422) may be formed with a length corresponding to the height of the base bottom (412). Here, the height may mean the length in the Z-axis direction of one configuration.

[0184] A guide rail joining groove (4124) may be formed in the base bottom plate (4121). The guide rail joining groove (4124) may be formed by being sunken into one surface of the base bottom plate (4121) and having a shape corresponding to one surface of the guide rail bottom (422) so that the guide rail bottom (422) is secured.

[0185] Specifically, the guide rail coupling groove (4124) can be formed on one surface of the base bottom plate (4121) that comes into contact with the base top receiving portion (4123).

[0186] The number of guide rail joining grooves (4124) can be provided corresponding to the number of guide rail bottoms (422).

[0187] By having the guide rail top (421) coupled to the base top (411) accommodated in the guide rail bottom (422) coupled to the base bottom (412), the base top (411) can move up and down inside the base bottom (412).

[0188] The fixing member (430) is configured to fix one of the plurality of lens units (300) to a light transmitting position. The fixing member (430) may be provided on one surface of the base bottom (412). The fixing member (430) may be coupled to the rear of the base bottom (412). A detailed description of the fixing member (430) and the balance member (480) will be described later.

[0189] The motor (440) is configured to change the positions of multiple lens units (300) by driving force generated by applying power. The motor (440) may be provided on one side of the base (410).

[0190] Specifically, the motor (440) may be installed at the rear of the base bottom (412). The motor (440) may be a BLDC motor and may include a stator and a rotor. However, the type of the motor (440) is not necessarily limited thereto, and various types of motors may be utilized depending on the embodiment.

[0191] The drive unit (400) may include a first gear (441) coupled to the motor (440) to transmit the driving force of the motor (440) to the base top (411).

[0192] The first gear (441) may be a pinion gear, but is not necessarily limited thereto. The first gear (441) may be coupled to one side of the motor (440). In addition, the first gear (441) may be installed to engage with a guide member (450) described below.

[0193] FIG. 11 is a rear view of a base bottom according to one embodiment of the present disclosure.

[0194] Referring to FIGS. 10 and 11 together, a pinion receiving portion (4122a) may be formed on one side of the base bottom wall (4122).

[0195] The pinion receiving portion (4121a) is configured to receive the first gear (441). The pinion receiving portion (4122a) may be formed in a half-cylindrical shape having a radius larger than the radius of the first gear (441).

[0196] The pinion receiving portion (4122a) can be formed by protruding one surface of the base bottom wall (4122) outward.

[0197] A pin opening (4121a) may be provided in the base bottom plate (4121).

[0198] The pin opening (4121a) is configured to allow the fixing member (430) to penetrate the base bottom plate (4121).

[0199] The pin opening (4121a) may be formed as a hollow shape having a shape corresponding to one cross section of the pin (431) of the fixing member (430).

[0200] Accordingly, even if the fixed member (430) is coupled to the back surface of the base bottom plate (4121), the fixed member (430) can support the base top (411).

[0201] The shape of the pin opening (4121a) is not necessarily limited to that shown, and its shape may be changed to correspond to various embodiments of the fixing member (430).

[0202] In this disclosure, the pin opening (4121a) is illustrated assuming that the cross-section of the pin (431) is approximately T-shaped. For a detailed description of the cross-section of the pin (431), refer to the content described later in FIG. 20.

[0203] FIG. 12 is an enlarged exploded view of a fixing member according to one embodiment of the present disclosure.

[0204] Referring to FIG. 12, the fixed member (430) may include a pin (431), an elastic member (432), and a cover (433).

[0205] The fixing member (430) may be provided as a single piece. The fixing member (430) may be coupled to the rear surface of the base bottom (412). In other words, the fixing member (430) may be installed biased toward one side of the rear surface of the base bottom (412).

[0206] The pin (431) is configured to be in contact with the base top (411) and the guide member (450).

[0207] The pin (431) can penetrate the pin opening (4121a) formed in the base bottom (412) as described in FIG. 11.

[0208] A portion of the pin (431) may be exposed to the front by penetrating the rear surface of the base bottom (412) through the pin opening (4121a).

[0209] A portion of the front-exposed pin (431) may come into contact with the guide member (450).

[0210] Since the guide member (450) is configured to be coupled with the base top (411), when the base top (411) is moved, the guide member (450) can also be moved together. Since a portion of the pin (431) is in contact with the guide member (450), an external force can be applied to the pin (431) during the process of moving the base top (411).

[0211] The elastic member (432) is configured to be coupled to one side of the pin (431) so that the pin (431) moves in one direction when an external force is applied. The elastic member (432) may be a spring, but this is only an example, and any configuration having elasticity may be used without limitation.

[0212] The cover (433) is configured to be fixed to one end of the elastic member (432) so that the elastic member (432) can be compressed.

[0213] The cover (433) can be coupled to the rear surface of the base bottom (412). By coupling the cover (433) to the rear surface of the base bottom (412), the fixing member (430) can be stably fixed at a fixed position. Accordingly, as described above, even if an external force is applied to the pin (431), the cover (433) does not deviate from the fixed position, so that the elastic member (432) coupled to the fixing member (433) on one side can be compressed.

[0214] In other words, when the pin (431) is moved toward the cover (433) by an external force, since the cover (433) is fixed, the elastic member (432) can be compressed by the distance that the pin (431) moves. At this time, the elastic member (432) can have elasticity in proportion to the compressed length.

[0215] The elastic force of the elastic member (432) may be a force directed in the opposite direction to the direction in which the pin (431) moves. Accordingly, the pin (431) may receive an external force directed in the opposite direction of the cover (433).

[0216] The cover (433) can be coupled to a cover coupling protrusion (4121b) formed on the base bottom (412). The cover coupling protrusion (4121b) can extend vertically from one surface of the base bottom plate (4121). The cover coupling protrusion (4121b) can have a hollow cylindrical shape.

[0217] The cover (433) may include a cover base (4331) and a cover bulkhead (4332) that protrudes vertically from the outer surface of the cover base (4331).

[0218] The cover base (4331) may be a circular flat plate, and a groove (4332a) may be formed in the cover bulkhead (4332) to be coupled to the base bottom (412). However, the shape of the cover (433) is not necessarily limited to that shown in the drawing, and may be formed in various shapes in various embodiments.

[0219] The diameter of the cover base (4331) may be larger than the diameter of the cover engaging protrusion (4121b). The cover base (4331) may accommodate the cover engaging protrusion (4121b).

[0220] The operation of each component of the fixed member (430) according to the movement of the base top (411) will be described in detail in FIG. 20 and below.

[0221] FIG. 13 and FIG. 14 are drawings showing a fixing member of a mobile projector according to one embodiment of the present disclosure being mounted on a base top.

[0222] Referring to FIGS. 13 and 14, the pin (431) of the fixing member (430) can be secured to the base top (411). Specifically, the pin (431) can be fastened to the fixing groove (4115) of the base top (411).

[0223] The fixed groove (4115) may be formed by being sunken so as to have a shape corresponding to the pin (431). The fixed groove (4115) may be formed on one surface of the base top wall (4113). The fixed groove (4115) may include a first fixed groove (4115a) formed on the lower side of the base top (411) and a second fixed groove (4115b) formed on the upper side of the first fixed groove (4115a).

[0224] Figure 13 is a drawing showing a state in which a pin (431) of a fixed member (430) is fastened to a first fixed groove (4115a), and Figure 14 is a drawing showing a state in which a pin (431) is fastened to a second fixed groove (4115b).

[0225] When the pin (431) is fastened to the fixed groove (4115), the elastic force of the elastic member (432) may not be 0. That is, even when the pin (431) is fastened to the fixed groove (4115), the elastic force of the elastic member (432) may act in a direction that pushes the pin (431) toward the fixed groove (4115).

[0226] By fastening the pin (431) to the fixing groove (4115), the base top (411) can be stably fixed to a specific position. For example, when the pin (431) is fastened to the first fixing groove (4115a), the base top (411) can be maintained in a position while being fixed to the inner upper portion of the base bottom (412). Conversely, when the pin (431) is fastened to the second fixing groove (4115b), the base top (411) can be maintained in a position while being fixed to the inner lower portion of the base bottom (412).

[0227] FIG. 15 and FIG. 16 are schematic drawings showing how light is projected from an image output module when multiple lens units of a mobile projector according to an embodiment of the present disclosure are located at different positions.

[0228] FIG. 15 is a drawing showing the angle of view of a plurality of lens units (300) in a state where the pin (431) is fastened to the first fixing groove (4115a) as in FIG. 13.

[0229] When the pin (431) is fastened to the first fixing groove (4115a), the base top (411) is fixed to the inner upper part of the base bottom (412) (see FIG. 13), so the second lens unit (320) is positioned on the path (R) of light output from the lamp (210).

[0230] In this case, the light output from the lamp (210) can be projected toward the front bottom surface of the main body (10) through the second lens unit (320).

[0231] Fig. 16 is a drawing showing the angle of view of multiple lens units (300) in a state where the pin (431) is fastened to the second fixing groove (4115b) as in Fig. 14.

[0232] When the pin (431) is fastened to the second fixing groove (4115b), the base top (411) is fixed to the inner lower part of the base bottom (412) (see FIG. 14), so the first lens unit (310) is positioned on the path of light output from the lamp (210).

[0233] In this case, the light output from the lamp (210) can be projected toward the front wall of the main body (10) through the first lens unit (310).

[0234] Since the base top (411) can be stably fixed at a specific position within the base bottom (412) by the fixing member (430), it can not move out of the fixed position even when the main body (10) is moved.

[0235] Accordingly, the image quality and focus of the image projected by the projector (1) can be maintained at preset values.

[0236] The preset values ​​here refer to data on the image quality and focus calculated for the projector (1) to project light onto a specific projection surface at a specific location.

[0237] Fig. 17 is a perspective view of a guide member and a guide bracket according to an embodiment of the present disclosure. Fig. 18 is a drawing showing a state in which a guide member according to an embodiment of the present disclosure is coupled to a base top.

[0238] Referring to FIGS. 17 and 18, the drive unit (400) may further include a guide member (450).

[0239] The guide member (450) is configured to be coupled to the base top (411) and to support the fixed member (430). The guide member (450) can be coupled to one side of the base top (411).

[0240] The guide member (450) may include a bracket receiving portion (451) and a second gear (452).

[0241] The bracket receiving portion (451) is configured to receive a guide bracket (460). The bracket receiving portion (451) may be formed in a U shape and may receive a guide bracket (460) on the inside.

[0242] The guide bracket (460) is provided on one side of the base top (411) and is configured to guide the movement path of the base top (411).

[0243] The guide bracket (460) may be provided at a position facing the guide rail (420). The guide bracket (460) may be coupled to the base bottom (412). Specifically, the guide bracket (460) may be coupled to the base bottom wall (4122). To this end, a bracket coupling hole (4122a) may be formed in a region of the base bottom wall (4122). The bracket coupling hole (4122a) may be formed in a region of the base bottom wall (4122) that is in contact with the guide bracket (460).

[0244] The guide bracket (460) may have a plurality of holes (460a) formed in an area that comes into contact with the bracket coupling hole (4122a). The plurality of holes (460a) may be formed to have a shape corresponding to the bracket coupling hole (4122a). The guide bracket (460) may be fixed to the base bottom (412) by a coupling member (not shown) that penetrates the plurality of holes (460a) and is fastened to the bracket coupling hole (4122a).

[0245] By accommodating a guide bracket (460) in a guide member (450) coupled to the base top (411), the base top (411) can move up and down along a fixed path.

[0246] The second gear (452) is configured to transmit the driving force generated from the motor (440) to the base top (411). The second gear (452) may be arranged to mesh with the first gear (441) to allow the base top (411) to move while the motor (440) is driven.

[0247] The second gear (452) may be formed in the longitudinal direction (Z-axis direction) of the guide member (450). The second gear (452) may be formed to protrude vertically in the opposite direction of the bracket receiving portion (451).

[0248] The second gear (452) may be a rack gear. The second gear (452) may form a rack-and-pinion gear structure together with the first gear (441), a detailed description of which will be described later in FIG. 23 and below.

[0249] Meanwhile, the guide member (450) may further include a guide surface (453).

[0250] The guide surface (453) is configured to move the fixed member (430). The guide surface (453) may be formed on one side of the guide member (450). The guide surface (453) may be formed in a direction opposite to the bracket receiving portion (451).

[0251] The guide surface (453) may be formed by extending from one side of the second gear (452). The guide surface (453) may be provided in a direction perpendicular to the surface on which the teeth (4521) of the second gear (452) are formed.

[0252] The guide surface (453) may include first to fifth surfaces (453-1, 453-2, 453-3, 453-4, 453-5).

[0253] The first surface (453-1) may be a surface extending from one side of the guide member (450). The first surface (453-1) may be a surface that is bent and extends from the lower end (450a) of the guide member (450). The first surface (453-1) may refer to one surface of the second gear (452). That is, the first surface (453-1) may be a surface perpendicular to the surface on which the teeth (4521) are formed in the second gear (452), that is, an area of ​​the side surface (4522) of the second gear (452).

[0254] The second surface (453-2) may be a surface that protrudes from the first surface (453-1) toward the base bottom plate (4121) and tapers upward.

[0255] The upward angle of the second surface (453-2) is not limited to a specific angle and can be specified at the stage of designing the movement path of the pin (431). Therefore, the upward angle of the second surface (453-2) is not necessarily limited to that shown in the drawing.

[0256] The third side (453-3) may be a side extending parallel to one side of the base top (411) from the second side (453-2).

[0257] For example, the third surface (453-3) may be formed to be parallel to the base top plate (4112). The third surface (453-3) may be perpendicular to the surface on which the teeth (4521) of the second gear (452) are formed.

[0258] The fourth surface (453-4) may be a surface that tapers downward from the third surface (453-3) toward the opposite side of the light source unit (200). The downward angle of the fourth surface (453-4) is not limited to a specific angle.

[0259] The fifth surface (453-5) may be a surface extending parallel to one surface of the base top (411) from the fourth surface (453-4). The fifth surface (453-5) may be formed to be parallel to the base top plate (4112). The fifth surface (453-5) may be perpendicular to the surface on which the teeth (4521) of the second gear (452) are formed.

[0260] When the base top (411) moves up and down, the pin (431) of the fixed member (430) may move forward and backward (+Y direction, -Y direction) depending on the shape of the first to fifth surfaces (453-1, 453-2, 453-3, 453-4, 453-5), thereby causing the elastic member (432) to be compressed or decompressed.

[0261] Meanwhile, the driving unit (400) may further include a bracket holder (470). The bracket holder (470) may be coupled to a base top wall (4113-2) at a position opposite to a base top wall (4113-1) to which a guide member (450) is coupled.

[0262] The bracket holder (470) is configured to accommodate the guide bracket (460). The bracket holder (470) may be formed to have a U-shaped shape, like the bracket receiving portion (451) of the guide member (450).

[0263] Since one side of the base top (411) to which the guide member (450) is not coupled by the bracket holder (470) is supported by the guide bracket (460), the balance of both sides can be maintained when the base top (411) is moved.

[0264] FIG. 19 is a drawing for explaining a portion of a base top and a guide member in a combined state according to one embodiment of the present disclosure.

[0265] Referring to FIG. 19, the first fixing groove (4115a) may be formed coaxially with the first connection point (t1) of the first surface (453-1) and the second surface (453-2). The second fixing groove (4115b) may be formed coaxially with the second connection point (t2) of the fourth surface (453-4) and the fifth surface (453-5).

[0266] That is, the center (c1) of the first fixed groove (4115a) can be formed on the same virtual axis line as the first connection point (t1) of the first surface (453-1) and the second surface (453-2). The center (c2) of the second fixed groove (4115b) can be formed on the same virtual axis line as the second connection point (t2) of the fourth surface (453-4) and the fifth surface (453-5).

[0267] The second surface (453-2) to the fourth surface (453-4) excluding the connection points (t1, t2) may have a length that protrudes and extends away from the first surface (453-1) and the fifth surface (453-5).

[0268] Accordingly, during the movement process of the base top (411), the fixed member (430) can be fastened to the fixed groove (4115) only when it is located at the connection point (t1, t2).

[0269] FIG. 20 and FIG. 21 are perspective and rear views illustrating a fixing member according to one embodiment of the present disclosure.

[0270] Referring to FIGS. 20 and 21, the pin (431) of the fixed member (430) may be arranged to be in contact with the guide surface (453). The elastic member (432) may be coupled to one side of the pin (431) so that the pin (431) moves in the opposite direction of the guide surface (453) when an external force is applied.

[0271] The pin (431) may include a cylindrical body portion (4311) and a protrusion portion (4312) that protrudes outward from one surface of the body portion (4311). The protrusion portion (4312) may be formed to have a cross-section that is approximately T-shaped.

[0272] The protrusion (4312) may include a catch plate (4312a) formed to be in contact with the guide surface (453) so as to move along the guide surface (453), and a fixing plate (4312b) formed perpendicular to the catch plate (4312a) and having a shape corresponding to the fixing groove (4115) so as to be seated in the fixing groove (4115).

[0273] The body portion (4311) may be formed to have a roughly cylindrical or conical shape. The back surface (4311a) of the body portion (4311) may be formed in a hollow cylindrical shape. A coupling protrusion (4311b) for coupling an elastic member (432) may be formed inside the back surface (4311a) of the body portion (4311). The body portion (4311) may receive the elastic force of the elastic member (432) by coupling the coupling protrusion (4311b) with the elastic member (432).

[0274] The protrusion (4312) may be formed by protruding and extending in the opposite direction of the back surface (4311a) from the front surface (4311c) of the body portion (4311). The front surface (4311c) of the body portion (4311) may be a circular flat plate having a smaller diameter than the back surface (4311a).

[0275] The fixed plate (4312b) may be formed to have an arc-shaped outer surface. The protruding length of the fixed plate (4312b) may be formed to be longer than the diameter of the front surface (4311c) of the body portion (4311). That is, the fixed plate (4312b) may be formed in an arc-shaped shape having a major axis and a minor axis.

[0276] The end (4312b-1) of the fixed plate (4312b) can be seated in the fixed groove (4115). The end (4312b-1) of the fixed plate (4312b) can have a shape corresponding to the fixed groove (4115).

[0277] The outer surface of the end (4312b-1) of the fixed plate (4312b) is in contact with the inner surface of the fixed groove (4115), so that the protrusion (4312) can be fastened to the fixed groove (4115).

[0278] The catch plate (4312a) may be formed to be perpendicular to the fixed plate (4312b). The catch plate (4312a) may be formed to protrude and extend from the front surface (4311c) of the body portion (4311).

[0279] The catch plate (4312a) may have a width equal to the radius of the front surface (4311c) of the body portion (4311). An end portion (4312a-1) of the catch plate (4312a) may be connected to an end portion (4312b-1) of the fixed plate (4312b).

[0280] The length by which the catch plate (4312a) protrudes from the front surface (4311c) of the body part (4311) may be the same as the protruding length of the fixed plate (4312b).

[0281] The retaining plate (4312a) may be formed to have an arc-shaped outer surface having a major axis and a minor axis. The retaining plate (4312a) may have the same shape as a portion of the fixed plate (4312b). The retaining plate (4312a) may have a shape that shares the same major axis as the fixed plate (4312b).

[0282] Since the catch plate (4312a) shares the same major axis as the fixed plate (4312b) and the catch plate (4312a) and the fixed plate (4312b) are formed to be perpendicular to each other, the cross section of the protrusion (4312) can be formed in an approximately T shape.

[0283] FIG. 22 is a drawing for explaining a process in which a fixing member is compressed by a guide member according to one embodiment of the present disclosure.

[0284] Referring to Fig. 22, as the base top (411) moves downward inside the base bottom (412), the guide member (450) coupled to the base top (411) may also move downward. When the base top (411) and the guide member (450) move downward, the fixing member (430) that was fixed to the first fixing groove (4115a) may be released.

[0285] Specifically, when the fixed member (430) is fastened to the first fixed groove (4115a), the fixed plate (4312b) may be accommodated on the inside of the first fixed groove (4115a), and the catch plate (4312a) may be supported at the first connection point (t1) of the first surface (453-1) and the second surface (453-2).

[0286] In this case, the elastic member (432) may be pressing the pin (431) toward the guide surface (453).

[0287] When the base top (411) is moved downward by the driving force generated from the motor (440), the fixed plate (4312b) can be separated from the first fixed groove (4115a). Specifically, as the guide member (450) is moved downward, the catch plate (4312a) can be pushed by the inclined second surface (453-2). That is, the pin (431) receives a force applied in the opposite direction of the base top (411), and the elastic member (432) is compressed by this force, so that the pin (431) can be moved in a direction away from the base top (411).

[0288] After this, as the base top (411) moves downward, the catch plate (4312a) can be supported by the second connection point (t2) along the third surface (453-3) and the fourth surface (453-4). In this process, the fixed plate (4312b) can be seated and fastened to the second fixed groove (4115b). In other words, as the base top (411) moves downward, the pin (431) is pressed with an elastic force opposite to the direction in which the compressed elastic member (432) is compressed, so the fixed plate (4312b) can be stably fastened to the second fixed groove (4115b).

[0289] FIG. 23 and FIG. 24 are drawings for explaining how the position of the base top is changed by the operation of the first gear and the second gear according to one embodiment of the present disclosure.

[0290] Referring to FIG. 23, the first gear (441) and the second gear (452) can be arranged to mesh with each other to form a rack-and-pinion gear structure.

[0291] As the motor (440) is driven, the first gear (441) can be rotated clockwise. As the first gear (441) is rotated clockwise, the base top (411) can be moved downwards of the base bottom (412).

[0292] In this case, the first lens unit (310) among the plurality of lens units (300) is positioned on the path of light output from the light source unit (200).

[0293] That is, the projector (1) projects light onto a projection surface that is arranged horizontally, such as the floor surface in front of the main body (10), and then rotates the first gear (441) clockwise to project light onto a projection surface (e.g., a wall surface, a furniture surface, etc.) that is arranged vertically in front of the main body (10).

[0294] Accordingly, the lens unit that projects light can be changed from the second lens unit (320) to the first lens unit (310).

[0295] Referring to FIG. 24, when the first gear (441) rotates counterclockwise as the motor (440) is driven, the base top (411) can be moved upwards of the base bottom (412).

[0296] In this case, the second lens unit (320) among the plurality of lens units (300) is positioned on the path of light output from the light source unit (200).

[0297] That is, the projector (1) can project light onto a projection surface (e.g., a wall surface, a furniture surface, etc.) provided vertically in front of the main body (10), and then rotate the first gear (441) counterclockwise to project light onto a projection surface provided horizontally, such as a floor surface, in front of the main body (10).

[0298] Accordingly, the lens unit that projects light can be changed from the first lens unit (310) to the second lens unit (320).

[0299] Description of the projection angle, i.e., the angle of view, when the first lens unit (310) and the second lens unit (320) project light will be omitted to the extent that it overlaps with the previously described scope.

[0300] Meanwhile, before and after the process of moving the base top (411) as described above, the changed position of the base top (411) can be stably maintained by the fixed member (430).

[0301] FIG. 25 is a drawing for explaining a balance member according to one embodiment of the present disclosure.

[0302] Referring to FIG. 25, the drive unit (400) may further include a balance member (480). The balance member (480) may have the same shape as the fixing member (430).

[0303] The balance member (480) may be provided as a pair with the fixed member (430). The balance member (480) may include a pin (481), an elastic member (482), and a cover (483).

[0304] However, the balance member (480) does not necessarily have to be formed to have the same shape as the fixed member (430). For example, the pin (481) of the balance member (480) may have a different shape from the pin (431) of the fixed member (430). In this case, the overall length (L2) of the pin (481) of the balance member (480) may be the same as the overall length (L1) of the pin (431) of the fixed member (430).

[0305] The balance member (480) may be provided in an area opposite to an area of ​​the base bottom plate (4121) where the fixing member (430) is provided. In other words, the fixing member (430) and the balance member (480) may be installed symmetrically on both sides with respect to an imaginary axis (P2) passing through the center of the base bottom plate (4121) in the Z-axis direction.

[0306] A corresponding pin opening (4121a) may also be formed in a pair in the base bottom plate (4121).

[0307] The pin (481) of the balance member (480) may be supported by the base top wall (4113). The elastic member (482) may be assembled to the balance member (480) in a compressed state. The pin (481) may be maintained in a state of pressing the base top wall (4113) by the elastic force of the elastic member (482).

[0308] Meanwhile, the base top wall (4113) supporting the balance member (480) may be configured to face the base top wall (4113) in which the fixing groove (4115) is formed. For example, the fixing groove (4115) may be formed in the left base top wall (4113-1), and the right base top wall (4113-2) may support the balance member (480).

[0309] In this way, the base top (411) is supported on both the left and right sides by the fixed member (430) and the balance member (480), so that the base top (411) can move while maintaining balance on the left and right sides.

[0310] FIG. 26 is a flowchart for explaining the operation of a projector according to one embodiment of the present disclosure.

[0311] Referring to FIG. 26, when the projection surface changes as the main body is moved by a plurality of wheels, the projector can recognize the position of the projection surface by determining whether the projection surface is positioned vertically in front of the main body or horizontally in front of the main body based on data about the distance and angle between the main body and the projection surface sensed by the sensor (S2610).

[0312] If the recognized projection surface is a wall surface and the projection surface on which light was projected before the position of the main body was changed is a floor surface, the driving unit can be controlled so that the first gear rotates counterclockwise (S2620).

[0313] In contrast, if the recognized projection surface is the floor and the projection surface on which light was projected before the position of the main body was changed is the wall, the driving unit can be controlled so that the first gear rotates clockwise (S2620).

[0314] The method described in FIG. 26 can be performed by the projector (1) described in the various embodiments described above, but is not necessarily limited thereto. It can also be performed by a projector with a different structure in which certain components are omitted or modified. Furthermore, even when implemented in a projector form without wheels, the projection surface may vary depending on the position of the projector. Even in such cases, the various embodiments described above can be applied.

[0315] In other words, a projector according to an embodiment of the present disclosure may include a plurality of lens units, and may control a driving unit to adjust the position of a lens unit having a projection direction corresponding to the type of a recognized projection surface to a transmission position on a light propagation path.

[0316] Additionally, a fixing member and a fixing groove to which the fixing member is fastened may be provided to ensure that the changed positions of the plurality of lens units are stably maintained.

[0317] Accordingly, even if the main body moves while the projector is moving, multiple lens units can be stably fixed in a fixed position, and by controlling light to be transmitted through an appropriate lens unit among different lens units depending on the type of projection surface, convenience and stability of use can be increased.

[0318] Although various embodiments of the present disclosure have been individually described above, each embodiment does not necessarily have to be implemented alone, and the configuration and operation of each embodiment may be implemented in combination with at least one other embodiment.

[0319] In addition, although the preferred embodiments of the present disclosure have been illustrated and described above, the present disclosure is not limited to the specific embodiments described above, and various modifications may be made by a person having ordinary skill in the art to which the present invention pertains without departing from the gist of the present disclosure claimed in the claims, and such modifications should not be understood individually from the technical idea or prospect of the present disclosure.

Claims

1. Main body; At least one wheel for moving the main body; A light source unit that emits light and moves with the main body; A plurality of lens units having different directions for projecting the light; A driving unit for adjusting the positions of the plurality of lens units; and A portable projector, comprising: a processor that controls the driving unit to adjust the position of a lens unit having a projection direction corresponding to the changed projection surface among the plurality of lens units to a transmission position on the light propagation path when the main body is moved by the at least one wheel and the projection surface is changed.

2. In paragraph 1, The above plurality of lens units are, A first lens unit that projects light upward based on the light source unit; and A mobile projector, comprising a second lens unit that projects light downward based on the light source unit.

3. In paragraph 2, The above processor, If the above-mentioned changed projection surface is a wall surface, the driving unit is controlled to adjust the position of the first lens unit to the transmission position, A mobile projector that controls the driving unit to adjust the position of the second lens unit to the transmission position when the changed projection surface is the floor surface.

4. In paragraph 1, The above drive unit, A base for supporting the light source unit and the plurality of lens units; a fixing member on the base that fixes one of the plurality of lens units to the transmitting position; and A mobile projector, comprising a motor provided on one side of the base.

5. In paragraph 4, The above base is, A base top in which the above plurality of lens units are combined and can move up and down; and A mobile projector further comprising a base bottom to which the light source unit is coupled.

6. In paragraph 5, The above base top is, A plurality of mounting portions are relatively coupled to the plurality of lens units, corresponding to the plurality of lens units; A mobile projector, wherein each of the plurality of mounting portions includes a hole penetrating the base top in the thickness direction.

7. In paragraph 5, The above drive unit, A mobile projector further comprising a guide member coupled to the base top to support the fixed member.

8. In paragraph 7, A mobile projector, comprising a first gear coupled to the motor and configured to transmit the driving force of the motor to the base top.

9. In paragraph 8, The above guide member is, A portable projector, which is attached to one side of the above base top.

10. In paragraph 9, The above guide member is, a guide surface for moving the above fixed member; and Further comprising a second gear meshing with the first gear; The above second gear, A movable projector in which, when the driving force is transmitted to the first gear, the second gear moves by the movement of the first gear, and the base top moves according to the movement of the second gear.

11. In paragraph 10, The above guide surface is, A first surface extending from one side of the guide member; A second surface protruding from the first surface toward the light source unit and tapering upward; A third surface extending parallel to one surface of the base top from the second surface; a fourth surface tapering downward away from the light source unit from the third surface; and A mobile projector comprising a fifth surface extending parallel to one surface of the base top from the fourth surface.

12. In paragraph 11, The above fixed member is, A pin in contact with the above guide surface; an elastic member coupled to one side of the pin so that the pin moves away from the guide surface when an external force is applied to the pin; and A cover coupled to one end of the elastic member; The above base top is, A mobile projector comprising a fixed groove having a shape corresponding to the above pin.

13. In paragraph 12, The above fixed home, A first fixing groove on the lower side of the base top; and A mobile projector comprising a second fixed groove above the first fixed groove.

14. In paragraph 13, The above first fixed groove is coaxial with the connection point of the first surface and the second surface, A mobile projector wherein the second fixed home is coaxial with the connection point of the fourth surface and the fifth surface.

15. In paragraph 14, The above pin is, a cylindrical body; and including a protrusion extending outward from one side of the above body portion; The above protrusion may have a T-shaped cross-section, A catch plate that moves along the guide surface and comes into contact with the guide surface; and A mobile projector comprising a fixing plate that is fixed in the fixing groove and has a shape corresponding to the fixing groove and is perpendicular to the hanging plate.

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