Projection device

Abstract

To protect an optical component inside a projection device, while preventing an adverse effect on a video to be projected.SOLUTION: A projection device 1 comprises: an optical engine 3 that forms an image; an impact absorber 4 that is arranged below the optical engine 3 inside a housing 2; stationary parts 5 that are provided fixed inside the housing 2; and a stationary plate 6 that is provided on the optical engine 3, connected with the stationary parts 5, and when applied with a force F with a predetermined magnitude or more, cut off from the stationary parts 5.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a projection apparatus. [Background technology]

[0002] Projectors are precision instruments that have optical components inside and are generally vulnerable to shocks.

[0003] Patent Document 1 describes a configuration in which a digital camera, which has optical components inside it like a projector, is surrounded by a shock-absorbing material to protect the internal optical components. Summary of the Invention [Problem to be solved by the invention]

[0004] However, if the existing technology for protecting optical components using shock-absorbing materials is applied to projectors, the weight of the optical components will compress the shock-absorbing materials, causing the optical components to lose their position and resulting in the projected image being misaligned during use. For this reason, it is difficult to apply this technology to projectors (projection devices), where the stability of the optical components is linked to the stability of the projected image.

[0005] The present invention aims to protect the optical components inside the projection device while preventing adverse effects on the projected image. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, a projection device according to one aspect of the present invention comprises an optical engine that forms an image, an impact absorbing material that is arranged below the optical engine inside a housing, a fixing part that is fixed inside the housing, and a fixed part that is provided on the optical engine, connected to the fixing part, and detached from the fixing part when a force greater than a predetermined value is applied. [Effects of the Invention]

[0007] This makes it possible to protect the optical components inside the projection device while preventing any adverse effects on the projected image. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view showing a schematic internal configuration of a projection device according to a first embodiment. [Figure 2] FIG. 1 is a schematic diagram illustrating the operation inside the housing when an impact is applied to the projection device. [Figure 3] FIG. 10 is a diagram showing a modification of the first embodiment. [Figure 4] FIG. 10 is a cross-sectional view showing a schematic internal configuration of a projection device according to a second embodiment. [Figure 5] 10 is a flowchart showing the control of attachment and detachment of the fixing plate by the fixing unit in the second embodiment. [Figure 6] Schematic diagram showing the internal state of the housing during each stage of the attachment / detachment control shown in Figure 5. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments will be described with reference to the accompanying drawings. To facilitate understanding of the description, the same components in the drawings will be denoted by the same reference numerals as much as possible, and duplicated descriptions will be omitted.

[0010] [First embodiment] The first embodiment will be described with reference to Figures 1 to 3. Figure 1 is a cross-sectional view showing a schematic internal configuration of a projection device 1 according to the first embodiment. In the cross-sectional views shown in this specification, including Figure 1, the up-down direction in the drawing corresponds to the vertical direction when the projection device 1 is installed, and the left-right direction in the drawing corresponds to the horizontal direction when the projection device 1 is installed.

[0011] A projection device 1 is a type of display device that displays images or videos by projecting them onto a large screen or the like. There are various types of projection devices 1, but currently, the term generally refers to a device that uses DLP or LCD to enlarge and project images. A projection device 1 is also called a projector.

[0012] 1, the projection device 1 includes an optical engine 3 that forms an image inside a housing 2 made of, for example, resin. The optical engine 3 also includes a light source that emits light.

[0013] The projection device 1 of the first embodiment further includes, inside the housing 2, a shock absorbing material 4, a fixing portion 5, and a fixing plate 6 (fixed portion).

[0014] The shock absorbing material 4 is disposed below the optical engine 3. In the example of Fig. 1, the shock absorbing material 4 is placed on the bottom surface 2C of the inner wall of the housing 2.

[0015] The fixed portion 5 is fixedly provided inside the housing 2. In the example of Fig. 1, the fixed portion 5 includes a pair of elements 5A, 5B formed to protrude toward the center from a pair of opposing side surfaces 2A, 2B of the inner wall of the housing 2. In the following description, the pair of fixed portions 5A, 5B may also be collectively referred to as the fixed portion 5.

[0016] The fixed plate 6 is provided on the optical engine 3. More specifically, the fixed plate 6 is a plate material on which the optical engine 3 is placed, and the optical engine 3 is fixed to the upper surface of the fixed plate 6. The fixed plate 6 is connected to the fixed part 5, and functions as a fixed part that is separated from the fixed part 5 when a force F (see FIG. 2) equal to or greater than a predetermined value is applied.

[0017] 1, the pair of fixed portions 5A, 5B are permanent magnets, and the fixed plate 6 is a metal plate, which is an example of a magnetic material. The permanent magnet of the fixed portion 5 preferably has a magnetic force that balances at least the gravity acting on the optical engine 3 and the fixed plate 6. Note that it is sufficient that at least both end portions 6A, 6B of the fixed plate 6 that come into contact with the fixed portions 5A, 5B are made of a magnetic material.

[0018] The shock absorbing material 4 can be made of, for example, low-resilience urethane or low-elasticity rubber. The area of ​​the shock absorbing material 4 in a plan view is equal to or larger than that of the fixed plate 6 on which the optical engine 3 is placed, and the outer shape of the shock absorbing material 4 in a plan view is preferably larger than that of the fixed plate 6. The thickness of the shock absorbing material 4 in the vertical direction is determined depending on the total weight of objects that will fall onto the shock absorbing material 4 when an impact is applied, including the fixed plate 6 and the components such as the optical engine 3 placed on the fixed plate 6, and the impact acceleration applied to these objects, etc.

[0019] The operation of the projection device 1 of the first embodiment will be described with reference to Fig. 2 in addition to Fig. 1. Fig. 2 is a schematic diagram illustrating the operation inside the housing 2 when an impact is applied to the projection device 1. On the other hand, Fig. 1 shows the internal state of the housing 2 in normal times before an impact is applied to the projection device 1.

[0020] As shown in FIG. 1 , in this embodiment, a pair of fixed portions 5A and 5B, which are permanent magnets, each have lower surfaces 5A1 and 5B1 whose normal direction is vertically downward. Under normal conditions, a pair of horizontal ends 6A and 6B of fixed plate 6, which is a magnetic material, are attracted to these lower surfaces 5A1 and 5B1, respectively, by the magnetic force of the pair of fixed portions 5A and 5B, which are permanent magnets. As a result, fixed plate 6 is suspended from the pair of fixed portions 5A and 5B, and fixed plate 6 is connected to fixed portion 5. In this case, fixed plate 6 may be in contact with or out of contact with shock absorbing material 4 as long as its relative positional relationship with at least fixed portion 5 and housing 2 is constant.

[0021] 1, when the projection device 1 is started and the optical engine 3 operates to perform projection, during projection the optical engine 3 remains fixed to the housing 2 via the fixing plate 6 and the fixing part 5. Therefore, the relative positional relationship between the optical engine 3 and the housing 2 can be maintained constant during projection, and no positional deviation of the projected image occurs.

[0022] On the other hand, as shown in Fig. 2, if an external force F of a predetermined magnitude or greater is applied to the projection device 1, for example, if the projection device 1 is dropped to the ground during transportation, and the projection device 1 receives an impact, the fixing plate 6 is separated from the fixing part 5 due to the influence of the external force F, as shown by the dotted circle A in Fig. 2. As a result, the fixing plate 6 falls downward together with the optical engine 3, as shown by the arrow B in Fig. 2, and collides with the shock absorbing material 4. At this time, the shock absorbing material 4 is compressed, thereby reducing the impact on the optical engine 3.

[0023] In short, in the projection device 1 of the first embodiment, the optical engine 3 inside the projection device 1 is normally fixed to the exterior housing 2 via a fixed plate 6 and a fixed portion 5, but when a predetermined force F is applied, the fixed plate 6 and the optical engine 3 are detached from the fixed portion 5, and the impact applied to the fixed plate 6 and the optical engine 3 is absorbed by the shock absorbing material 4, thereby protecting the optical engine 3.

[0024] The projection device 1 of the first embodiment comprises an optical engine 3 that forms an image, an impact absorbing material 4 that is arranged below the optical engine 3 inside the housing 2, a fixed part 5 that is fixed inside the housing 2, and a fixed plate 6 that is provided on the optical engine 3, connected to the fixed part 5, and is detached from the fixed part 5 when a force F greater than a predetermined value is applied.

[0025] With this configuration, while the projection device 1 is in use, the fixed plate 6 is connected to the fixed portion 5, making it possible to fix the relative positions of the optical components (optical engine 3, light source, etc.) with respect to the housing 2, so that the projection position of the projected image can be kept constant during projection, preventing positional deviation of the projected image. Furthermore, when the projection device 1 is dropped or otherwise subjected to an impact, the fixed plate 6 separates from the fixed portion 5, allowing the impact received by the fixed plate 6 and optical engine 3 to be absorbed by the shock absorbing material 4, thereby protecting the optical components. Therefore, the projection device 1 of the first embodiment can protect the optical components inside the projection device 1 while preventing any adverse effects on the projected image.

[0026] Furthermore, in the projection device 1 according to the first embodiment, a fixing plate 6, which is a plate material on which the optical engine 3 is placed, is used as a fixed portion that is connected to the fixing portion 5. With this configuration, the optical engine 3 can be placed and fixed on the fixing plate 6, so that the installation position of the optical engine 3 can be more stably maintained under normal circumstances.

[0027] In the projection device 1 according to the first embodiment, the fixed portion 5 is a permanent magnet, and the fixed plate 6 serving as the fixed portion is a metal plate as an example of a magnetic material. The permanent magnet of the fixed portion 5 has a magnetic force that balances the gravity acting on the optical engine 3.

[0028] With this configuration, under normal circumstances when no external force F greater than a predetermined value is applied, no force greater than gravity is applied to the connecting portion between fixed portion 5 and fixed plate 6, so fixed portion 5 and fixed plate 6 are securely fixed together, while when an impact occurs, an external force F greater than gravity is applied to the connecting portion, so fixed portion 5 and fixed plate 6 are securely separated from each other. Therefore, the function of maintaining the position of optical engine 3 under normal circumstances and the function of protecting optical engine 3 when an impact occurs can be securely separated and performed separately.

[0029] Furthermore, in the projection device 1 according to the first embodiment, the fixed part 5 is disposed above the fixed plate 6, and the fixed plate 6 and the optical engine 3 are suspended from the fixed part 5. With this configuration, when an external force F is applied, unnecessary frictional force is less likely to occur at the contact portion between the fixed plate 6 and the fixed part 5, making it possible for the fixed plate 6 to be easily detached from the fixed part 5, and more reliably separating the functions under normal circumstances from those under impact.

[0030] Fig. 3 is a diagram showing a modified example of the first embodiment. In the above embodiment, the fixed unit 5 is disposed above the fixed plate 6, and the fixed plate 6 and the optical engine 3 are suspended from the fixed unit 5. However, the connection structure between the fixed unit 5 and the fixed plate 6 is not limited to this. For example, as in a projection device 1A according to a first modified example shown in Fig. 3(A), a pair of ends 6A and 6B of the fixed plate 6 may be configured to be attached to side surfaces 5A2 and 5B2 facing the center of the housing 2, rather than to bottom surfaces 5A1 and 5B1 of the pair of fixed units 5A and 5B.

[0031] Furthermore, in the above embodiment, the optical engine 3 is connected to the fixed portion 5 via the fixed plate 6 as the fixed portion, but the optical engine 3 may be connected to the fixed portion 5 by an element other than the fixed plate 6. For example, as in the projection device 1B according to the second modified example shown in FIG. 3(B), a pair of fixed portions 16A, 16B made of magnetic elements protruding horizontally may be provided on both horizontal side surfaces of the optical engine 3, and the optical engine 3 may be attracted to the fixed portions 5A, 5B via these fixed portions 16A, 16B. The pair of fixed portions 16A, 16B may be formed integrally with the optical engine 3, or may be connected to the optical engine 3.

[0032] Furthermore, in the above embodiment, a configuration was exemplified in which the fixed portion 5 is a permanent magnet and the fixed plate 6 as the fixed portion is a metal plate as an example of a magnetic material, but the opposite configuration may also be used in which the fixed portion 5 is magnetic and the fixed plate 6 is a permanent magnet.

[0033] Furthermore, the fixing part 5 and the fixing part (fixing plate 6) may have a configuration other than a set of a permanent magnet and a magnetic material. For example, the fixing part 5 and the fixing part may be integrally formed components that separate when an impact is applied due to plastic deformation, or the fixing part 5 and the fixing part may separate when an impact is applied due to the connection between them breaking. However, in these configurations, once an impact is applied, the fixing part 5 and the fixing part (fixing plate 6) must be replaced with the parts in their original state before separation.

[0034] [Second embodiment] The second embodiment will be described with reference to Figures 4 to 6. Figure 4 is a cross-sectional view showing a schematic internal configuration of a projection device 1C according to the second embodiment.

[0035] In the projection device 1C of the second embodiment shown in Fig. 4, a pair of fixing parts 15A and 15B corresponding to the fixing part 5 of the first embodiment are electromagnets. Therefore, when the fixing part 15 is energized, it generates a magnetic force and can attract the fixing plate 6. On the other hand, when the fixing part 15 is not energized, it does not generate a magnetic force and therefore cannot attract the fixing plate 6.

[0036] As shown in FIG. 4, the projection device 1C includes a control unit 10, a power supply 11, and an acceleration sensor 12.

[0037] The power supply 11 supplies power to each element of the projection device 1 C. The power supply 11 is installed inside the housing 2 .

[0038] Acceleration sensor 12 detects the acceleration of projection device 1C. Acceleration sensor 12 is set at any location in projection device 1C, such as on the inner or outer wall of housing 2, on fixed plate 6, or inside optical engine 3.

[0039] The control unit 10 controls the attachment and detachment of the fixing unit 15 and the fixing plate 6, which is the fixed unit. When the power supply 11 of the projection device 1C is on, the control unit 10 connects the fixing unit 15 and the fixing plate 6, and when a force F equal to or greater than a predetermined value is applied to the projection device 1C, the control unit 10 releases the connection between the fixing unit 15 and the fixing plate 6.

[0040] More specifically, when the power of the projection device 1C is on, the control unit 10 activates the electromagnet of the fixing unit 15 to connect the fixing unit 15 to the fixing plate 6. On the other hand, when a force F equal to or greater than a predetermined value is applied to the projection device 1C, the control unit 10 deactivates the electromagnet of the fixing unit 15 to release the connection between the fixing unit 15 and the fixing plate 6. Furthermore, for example, when the acceleration sensor 12 detects an acceleration equal to or greater than a predetermined value, the control unit 10 determines that a force F equal to or greater than a predetermined value has been applied to the projection device 1C, and can release the connection between the fixing unit 15 and the fixing plate 6.

[0041] The control unit 10 can be physically configured as a computer system including a CPU (Central Processing Unit), RAM (Random Access Memory) and ROM (Read Only Memory) as main storage devices, a communication module, an auxiliary storage device, etc. Each function of the control unit 10 described above is realized by loading predetermined computer software into the CPU, RAM, etc., thereby operating various hardware under the control of the CPU and reading and writing data from and to the RAM.

[0042] The control unit 10 may be configured as part of a controller that controls the overall operation of the projection device 1C. In addition, in Fig. 4, for convenience of illustration, the control unit 10, power supply 11, and acceleration sensor 12 are shown as being arranged outside the housing 2, but in reality, these elements are installed inside the housing 2.

[0043] The operation of the projection device 1C of the second embodiment will be described with reference to Figures 5 and 6. Figure 5 is a flowchart showing the attachment / detachment control of the fixing plate 6 by the fixing unit 15 in the second embodiment. Each process in the flowchart shown in Figure 5 is performed by the control unit 10. Figure 6 is a schematic diagram showing the state inside the housing 2 in each process of the attachment / detachment control shown in Figure 5.

[0044] 5, that is, when the power supply 11 of the projection device 1C is off, the switch of the control unit 10 is also off. In this state, as shown in FIG. 6(A), the electromagnet of the fixing unit 15 is not energized, so the fixing plate 6, which is the part to be fixed, is separated from the fixing unit 15 and placed on the shock absorbing material 4.

[0045] Next, when power supply 11 is turned on (step S1), control unit 10 is also activated and the switch of control unit 10 is also turned on (step S2). This starts the flow of electricity to the electromagnet of fixed unit 15, generating a magnetic force. At this time, as shown by arrow C in FIG. 6(B), a pair of horizontal ends 6A and 6B of fixed plate 6, which is a magnetic material, are attracted to bottom surfaces 15A1 and 15B1 of fixed units 15A and 15B, respectively, by the magnetic force of the pair of electromagnets. As a result, fixed plate 6 is suspended from a pair of fixed units 5A and 5B, as shown in FIG. 6(B), and fixed plate 6 is connected to fixed unit 15.

[0046] Next, when acceleration sensor 12 installed inside projection device 1C detects an acceleration equal to or greater than a predetermined value (step S3), information indicating this is input to control unit 10. In response to this information input, control unit 10 determines that a force F equal to or greater than a predetermined value has been applied to projection device 1C, causing an impact, and switches control unit 10 to the OFF state (step S4). As a result, as shown in FIG. 6(C), power is stopped from being supplied to the electromagnet of fixing unit 15, the magnetic force of the electromagnet disappears, the connection between fixing unit 15 and fixing plate 6 is released, and fixing plate 6 is separated from fixing unit 15 as indicated by dotted circle D. As a result, fixing plate 6 falls downward together with optical engine 3 as indicated by arrow E in FIG. 6(C) and collides with shock absorbing material 4. At this time, shock absorbing material 4 compresses, thereby reducing the impact on optical engine 3.

[0047] In this way, when power supply 11 of projection device 1C is on, no positional deviation of the projected image occurs because fixed plate 6 is fixed to fixed portion 15. On the other hand, if an impact is applied while power supply 11 is on, control unit 10 separates fixed portion 15 from fixed plate 6, causing fixed plate 6 to collide with shock absorbing material 4, and reducing the impact transmitted to components placed on fixed plate 6, such as optical engine 3.

[0048] Furthermore, after the fixed plate 6 is connected to the fixed portion 15 in step S2, when the power supply 11 is turned off (step S5), the control unit 10 also stops and the switch of the control unit 10 is also turned off (step S6). In this case, as in steps S3 and S4, the connection between the fixed portion 15 and the fixed plate 6 is released, and the fixed plate 6 is placed on the shock absorbing material 4, as shown in FIG. 6(C). Therefore, when an impact is applied while the power supply 11 of the projection device 1C is off, the impact transmitted to the optical engine 3 is reduced because the fixed plate 6 is on the shock absorbing material 4.

[0049] Thus, the projection device 1C according to the second embodiment includes a control unit 10 that controls the attachment and detachment of the fixing unit 15 and the fixing plate 6 as the fixed unit. The control unit 10 connects the fixing unit 15 and the fixing plate 6 when the power supply 11 of the projection device 1C is on, and releases the connection between the fixing unit 15 and the fixing plate 6 when a force F equal to or greater than a predetermined value is applied to the projection device 1C.

[0050] With this configuration, while projection device 1C is in use, fixed plate 6 is connected to fixed portion 15, making it possible to fix the relative positions of the optical components (optical engine 3, light source, etc.) with respect to housing 2. This allows the projection position of the projected image to be kept constant during projection, preventing positional deviation of the projected image. Furthermore, when projection device 1C is dropped or otherwise subjected to an impact, fixed plate 6 separates from fixed portion 15, allowing shock absorbers 4 to absorb the impact on fixed plate 6 and optical engine 3, thereby protecting the optical components. Therefore, projection device 1C of the second embodiment can protect the optical components inside projection device 1C while preventing adverse effects on the projected image.

[0051] Furthermore, projection device 1C according to the second embodiment includes acceleration sensor 12 that detects the acceleration of projection device 1C, and when acceleration sensor 12 detects an acceleration equal to or greater than a predetermined value, control unit 10 determines that force F equal to or greater than a predetermined value has been applied to projection device 1C, and releases the connection between fixing unit 15 and fixing plate 6. With this configuration, it is possible to easily and accurately detect that projection device 1C has received an impact based on acceleration information.

[0052] Furthermore, in projection device 1C according to the second embodiment, fixed portion 15 is an electromagnet, and fixed plate 6, which serves as the fixed portion, is a metal plate, which is an example of a magnetic material. When power supply 11 of projection device 1C is on, control unit 10 activates the electromagnet of fixed portion 15 to connect fixed portion 15 to fixed plate 6, and when a force F equal to or greater than a predetermined value is applied to projection device 1C, control unit 10 deactivates the electromagnet of fixed portion 15 to release the connection between fixed portion 15 and fixed plate 6. With this configuration, connection and separation of fixed portion 15 and fixed plate 6 can be reliably performed by switching the electromagnet between activation and deactivation, making it easier to control the fixation and separation of housing 2 and fixed plate 6.

[0053] Furthermore, in the above embodiment, a configuration has been exemplified in which the fixing unit 15 is an electromagnet and the fixing plate 6, which serves as the fixed unit, is a metal plate, which is an example of a magnetic material, but the opposite configuration may also be used, in which the fixing unit 15 is a magnetic material and the fixing plate 6 is an electromagnet. In this case, elements such as the control unit 10 that controls the electromagnet and the acceleration sensor 12 are preferably placed on the fixing plate 6 together with the optical engine 3 and the like. This allows the relative positions of the control unit 10 and the acceleration sensor 12 to be maintained constant even when the fixing plate 6 is dropped, and prevents problems such as disconnection of the wiring connecting the elements when an impact is applied.

[0054] Furthermore, in the above embodiment, the configuration has been exemplified in which control unit 10 determines that a force F greater than or equal to a predetermined value has been applied to projection device 1C when acceleration sensor 12 detects an acceleration greater than or equal to a predetermined value, but control unit 10 may also be configured to detect the occurrence of an impact based on information other than the acceleration detected by acceleration sensor 12. For example, when vibration detected by a vibration sensor exceeds a predetermined value or when an impact detection sensor detects an impact, control unit 10 may be configured to detect the occurrence of an impact and release the connection between fixing unit 15 and fixing plate 6.

[0055] Furthermore, in the above embodiment, the fixing portion 15 is an electromagnet, and when the electromagnet is activated, it attracts and connects the fixing portion, that is, the fixing plate 6, and when the electromagnet is deactivated, it is released from the connection with the fixing plate 6. However, the fixing portion 15 may be configured to switch between connection and release with the fixing plate 6 using an element other than an electromagnet. For example, the fixing portion 15 may be a locking element such as a movable claw. In this case, when the power supply 11 of the projection device 1C is on, the claw of the fixing portion 15 locks the fixing plate 6, and the fixing portion 15 and the fixing plate 6 are connected. On the other hand, when an impact occurs, the fixing portion 15 is activated and the claw comes off the fixing plate 6, and the connection between the fixing portion 15 and the fixing plate 6 is released.

[0056] The present embodiment has been described above with reference to specific examples. However, the present disclosure is not limited to these specific examples. Design modifications to these specific examples made by a person skilled in the art as appropriate are also included within the scope of the present disclosure as long as they comprise the features of the present disclosure. The elements of the above-described specific examples, as well as their arrangement, conditions, shape, etc., are not limited to those exemplified and can be modified as appropriate. The elements of the above-described specific examples can be combined in various ways as appropriate, as long as no technical contradictions arise. [Explanation of symbols]

[0057] 1, 1A, 1B, 1C projection device 3 Optical Engine 4. Shock absorber 5, 15 Fixed part 6 Fixed plate (fixed part) 16A, 16B Fixed part 10 Control Unit 11 Power supply 12 Acceleration sensor [Prior art documents] [Patent documents]

[0058] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-128653

Claims

1. an optical engine for forming an image; a shock absorbing material disposed below the optical engine inside the housing; a fixing portion fixed inside the housing; a fixed portion that is provided on the optical engine, is connected to the fixed portion, and is separated from the fixed portion when a force equal to or greater than a predetermined force is applied thereto; A projection device comprising:

2. the fixed portion is a plate on which the optical engine is mounted, The projection device according to claim 1 .

3. one of the fixing portion and the fixed portion is a permanent magnet, and the other is a magnetic material; The permanent magnet has a magnetic force that balances the gravity acting on the optical engine.

3. The projection device according to claim 1.

4. a control unit that controls attachment and detachment of the fixing unit and the fixed unit, the control unit connects the fixing unit and the fixed unit when the power supply of the projection device is on, and releases the connection between the fixing unit and the fixed unit when a force equal to or greater than a predetermined value is applied to the projection device.

3. The projection device according to claim 1.

5. an acceleration sensor that detects the acceleration of the projection device; When the acceleration sensor detects an acceleration equal to or greater than a predetermined value, the control unit determines that a force equal to or greater than a predetermined value has been applied to the projection device, and releases the connection between the fixing unit and the fixed unit.

5. The projection device according to claim 4.

6. one of the fixing portion and the fixed portion is an electromagnet, and the other is a magnetic material; the control unit activates the electromagnet to connect the fixing unit and the fixing portion when the power supply of the projection device is on, and deactivates the electromagnet to release the connection between the fixing unit and the fixing portion when a force equal to or greater than a predetermined value is applied to the projection device.

6. The projection device according to claim 4 or 5.

7. The fixing portion is disposed above the fixed portion, the fixed portion and the optical engine are suspended from the fixed portion; The projection device according to any one of claims 1 to 6.

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