Lens holding mechanism and projection-type image display device

Abstract

The present disclosure provides a lens holding mechanism having at least one of good impact resistance, good bonding stability between components, or fine adjustability, and a projection-type image display device. A lens displacement member of the lens holding mechanism includes a first displacement member having a first holding portion that holds a projection lens and has a first recess, and is installed to a base member in a manner movable in a first direction, and a first power transmission portion that is formed as a structure separate from the first holding portion, has a first protrusion portion that is fitted into the first recess, and is installed to the base member in a manner movable in the first direction, the first power transmission portion is able to move the first holding portion in the first direction using the first protrusion portion, the first recess is formed as a first space in a substantially cuboid shape, one face of the first space into which the first protrusion portion is fitted is open, the first protrusion portion is fitted into the first space, and two faces opposite in the first direction are formed in a circular arc shape.

Description

Technical Field

[0001] This disclosure relates to a lens holding mechanism and a projection-type image display device having the lens holding mechanism. Background Technology

[0002] Patent document 1 discloses a lens shifting mechanism mounted on a projector. This lens shifting mechanism, in order to fine-tune the position of the projected image on the screen, shifts the projection lens along the vertical and horizontal directions orthogonal to its optical axis. The projection lens is shifted vertically and horizontally by the user rotating two dial knobs of the lens shifting mechanism located on the top surface of the projector.

[0003] In the lens shifting mechanism described in Patent Document 1, the second shifting member that shifts the projection lens in the vertical direction is an integral plate-shaped member. The second feed screw used to shift the second shifting member in the vertical direction is directly screwed into a threaded hole provided in the eaves-shaped part of the second shifting member. When the lens is subjected to a strong impact, the impact force is easily transmitted to the second feed screw, which can cause deformation of the second feed screw and affect the precision of the position adjustment.

[0004] Furthermore, in the lens shifting mechanism described in Patent Document 1, the first feed screw in the first shifting member that shifts the projection lens in the left-right direction also directly engages with the threaded hole provided in the eaves-shaped portion of the first shifting member. Therefore, the feed screws in both the first and second shifting members can only engage with the threaded hole provided in the thin plate-like portion of the eaves, resulting in a relatively small range of thread engagement.

[0005] Furthermore, in the lens shifting mechanism described in Patent Document 1, a dial knob is installed at the head of the feed screw. When the torque input by the operator to the feed screw via the dial knob is too large, there is a possibility that the shifting distance of the shifting component corresponding to the feed screw is too large, making it difficult to achieve fine adjustment.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: CN111610684A Summary of the Invention

[0009] This disclosure was made in consideration of the above circumstances, and its purpose is to provide a lens holding mechanism that has at least good impact resistance, or good stability of the connection between components, or fine adjustability, as well as a projection-type image display device having such a lens holding mechanism. Furthermore, the purposes listed herein are merely illustrative and not exhaustive.

[0010] The lens holding mechanism disclosed herein includes: a base member; and a lens shifting member that supports a projection lens and is mounted on the base member in a manner capable of shifting along a first direction and a second direction, the first direction being orthogonal to the optical axis extension direction of the projection lens, and the second direction being orthogonal to both the optical axis extension direction and the first direction. The lens shifting member includes a first shifting member capable of moving the projection lens along the first direction. The first shifting member has: a first holding portion that holds the projection lens and has a first recess, and is mounted on the base member in a manner capable of shifting along the first direction; and a first power transmission portion that is integrally formed with the first holding portion and has a first protrusion that engages with the first recess, and is mounted on the base member in a manner capable of shifting along the first direction. The first power transmission portion can drive the first holding portion to move along the first direction using the first protrusion. The first recess is formed as a first space of approximately cuboid shape, with one side of the first space open for the first protrusion to be inserted. The first protrusion is inserted into the first space, and the two opposing sides in the first direction are formed into arc shapes.

[0011] According to the lens holding mechanism of this disclosure, one of the two sides of the first space perpendicular to the direction of extension of the optical axis is open.

[0012] According to the lens holding mechanism of this disclosure, the lens shifting member further includes a second shifting member capable of moving the projection lens along the second direction. The second shifting member has: a second holding portion that holds the projection lens and is mounted on the base member in a manner movable along the second direction; a second power transmission portion that is integral with the second holding portion and is mounted on the base member in a manner movable along the first direction; and a connecting portion that connects the second holding portion and the second power transmission portion. The second power transmission portion moves along the first direction, causing the connecting portion to oscillate about the optical axis extension direction, thereby enabling the second holding portion to move along the second direction via the connecting portion.

[0013] According to the lens holding mechanism of this disclosure, the connecting part swings about the optical axis extension direction with the support pin provided on the base member as the center, is connected to the second holding part through the first connecting pin, and is connected to the second power transmission part through the second connecting pin. When the distance between the support pin and the first connecting pin is L1 and the distance between the support pin and the second connecting pin is L2, L1 < L2.

[0014] According to the lens holding mechanism of this disclosure, 0.8 < L1 / L2 < 0.95.

[0015] According to the lens holding mechanism of this disclosure, the first power transmission part has: a first screw part extending along the first direction, having a first external threaded portion formed on its outer periphery, and rotating about a first rotation center line; and a first seat part having the first protrusion and having a first internal threaded portion that engages with the first external threaded portion, moving along the first direction driven by the rotation of the first screw part, wherein the first internal threaded portion is formed as a partially open shape surrounding a portion of the circumferential direction of the first external threaded portion.

[0016] According to the lens holding mechanism of this disclosure, the second power transmission part has: a second screw part extending along the first direction, having a second external thread part formed on its outer periphery, and rotating about a second rotation center line; and a second seat part having a second internal thread part screwed into the second external thread part, which is driven by the rotation of the second screw part to move along the first direction, wherein the second internal thread part is formed as a partially open shape surrounding a portion of the circumferential direction of the second external thread part.

[0017] According to the lens holding mechanism of this disclosure, the base member, the second displacement member, and the first displacement member are stacked sequentially along the optical axis extension direction, and a spring member extending along the second direction is connected between the first displacement member and the second displacement member.

[0018] According to the lens holding mechanism of this disclosure, the first shifting member further has a power input section mounted on the first power transmission section and used for an operator to input torque to the first power transmission section, and restricts the input torque to the first power transmission section when the input torque exceeds a predetermined threshold.

[0019] According to the lens holding mechanism of this disclosure, the second shifting member further has a power input section mounted on the second power transmission section and used for an operator to input torque to the second power transmission section, and restricts the input torque to the second power transmission section when the input torque exceeds a predetermined threshold.

[0020] According to the lens holding mechanism of this disclosure, the power input unit includes: an operating part, one end of which is formed as a knob for rotational operation by an operator, and the other end is formed as a cylindrical part, wherein an internal spline is provided on the inner circumference of the cylindrical part, and a positioning shaft is provided at the center of the cylindrical part; and a torque receiving part, which is formed as a double-layered cylindrical part having an outer cylindrical part and an inner cylindrical part, wherein a space for receiving the cylindrical part is formed between the outer cylindrical part and the inner cylindrical part, the inner circumference of the outer cylindrical part is in sliding contact with the outer circumference of the cylindrical part, and the inner cylindrical part internally houses a pair of torque adjusting parts in a centrally symmetrical manner with respect to the positioning shaft, each of the torque adjusting parts having The main body has one end formed as a locking part that passes through the wall of the inner cylinder and the other end formed as a straight rod part spaced apart from the inner wall of the inner cylinder; and a spring part sleeved on the straight rod part, which can be in a first compression state or a second compression state. When the input torque is below the specified threshold, the spring part is in the first compression state and the locking part is locked in a keyway of the inner spline. When the input torque exceeds the specified threshold, the spring part is in the second compression state and the locking part is disengaged from the keyway. The outer cylinder part is connected to the first power transmission part on the side opposite to the operating part.

[0021] According to the lens holding mechanism of this disclosure, the power input unit includes: an operating part, one end of which is formed as a knob for rotational operation by an operator, and the other end is formed as a cylindrical part, wherein an internal spline is provided on the inner circumference of the cylindrical part, and a positioning shaft is provided at the center of the cylindrical part; and a torque receiving part, which is formed as a double-layered cylindrical part having an outer cylindrical part and an inner cylindrical part, wherein a space for receiving the cylindrical part is formed between the outer cylindrical part and the inner cylindrical part, the inner circumference of the outer cylindrical part is in sliding contact with the outer circumference of the cylindrical part, and the inner cylindrical part internally houses a pair of torque adjusting parts in a centrally symmetrical manner with respect to the positioning shaft, each of the torque adjusting parts having The main body has one end formed as a locking part that passes through the wall of the inner cylinder and the other end formed as a straight rod part spaced apart from the inner wall of the inner cylinder; and a spring part sleeved on the straight rod part, which can be in a first compression state or a second compression state. When the input torque is below the specified threshold, the spring part is in the first compression state and the locking part is locked in a keyway of the inner spline. When the input torque exceeds the specified threshold, the spring part is in the second compression state and the locking part disengages from the keyway. The outer cylinder part is connected to the second power transmission part on the side opposite to the operating part.

[0022] The projection-type image display device disclosed herein includes: the lens holding mechanism described above; and an optical system that emits light toward the projection lens.

[0023] Invention Effects

[0024] This disclosure provides a lens holding mechanism that has at least good impact resistance, good stability of the connection between components, or fine adjustability, as well as a projection-type image display device having the lens holding mechanism. Attached Figure Description

[0025] The objects, features, and advantages of this disclosure will become clearer from the following description of embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0026] Figure 1 This is a perspective view showing the lens holding mechanism of this disclosure;

[0027] Figure 2 This is an exploded perspective view showing the lens holding mechanism of this disclosure;

[0028] Figure 3 This is an exploded perspective view showing the first displacement member of this disclosure;

[0029] Figure 4 This is a front view showing the first displacement member of this disclosure;

[0030] Figure 5 This is an exploded perspective view showing the first retaining part and the first seat part of this disclosure;

[0031] Figure 6 This is an exploded perspective view showing the first retaining part and the first seat part of this disclosure;

[0032] Figure 7 This is a perspective view showing the first screw section of this disclosure;

[0033] Figure 8A This is a perspective view showing an example of the first base of this disclosure;

[0034] Figure 8B This is a side view showing an example of the first seat portion of this disclosure;

[0035] Figure 8C This is a perspective view showing another example of the first base of this disclosure;

[0036] Figure 9 This is an exploded perspective view showing the second displacement member of this disclosure;

[0037] Figure 10 This is a rear view showing the second shifting member of this disclosure;

[0038] Figure 11A This is a perspective view showing an example of a connecting part of this disclosure;

[0039] Figure 11B This is a front view showing an example of a connecting part of this disclosure;

[0040] Figure 11C This is a rear view showing an example of a connecting part of this disclosure;

[0041] Figure 12A This is a front view showing another example of the connecting portion of this disclosure;

[0042] Figure 12B This is a rear view showing another example of the connecting portion of this disclosure;

[0043] Figure 13A This is an exploded perspective view showing the power input section of this disclosure;

[0044] Figure 13B This is an exploded perspective view of the power input section of this disclosure, omitting the mounting plate;

[0045] Figure 13C This is an exploded perspective view of the power input section of this disclosure, omitting the mounting plate;

[0046] Figure 14A This is a perspective view showing the operating part of this disclosure;

[0047] Figure 14B This is a perspective view showing the operating part of this disclosure;

[0048] Figure 14C This is a bottom view showing the operating section of this disclosure;

[0049] Figure 15 This is a top view showing a pair of torque adjustment units of this disclosure;

[0050] Figure 16 This is a schematic diagram showing the change in the engagement state between the locking part in the torque adjustment section and the internal spline in the operation section of the present disclosure.

[0051] Explanation of reference numerals in the attached figures

[0052] 1. Lens holding mechanism; 8. Projection lens;

[0053] 10. Base component; 11. Support pin;

[0054] 20. Lens shifting component;

[0055] 21 First displacement component;

[0056] 211 first holding part; 211A first recessed part;

[0057] 212 First power transmission unit; C1 First rotation center line;

[0058] 212A First screw section; 212AN First external thread section;

[0059] 212B First seat portion; 212BT First protrusion portion; 212BN First internal thread portion;

[0060] 22. Second displacement component;

[0061] 221 Second retaining section;

[0062] 222 Second power transmission unit; C2 Second rotation center line;

[0063] 222A Second screw section; 222AN Second external thread section;

[0064] 222B Second seat portion; 222BN Second internal thread portion;

[0065] 223 Connecting part; 223A First connecting pin; 223B Second connecting pin;

[0066] 2S Spring Component;

[0067] 213 Power input unit;

[0068] 213A Operating section; 213AN Knob section; 213AT Cylindrical section; 213AS Internal spline; 213AX Positioning shaft;

[0069] 213B Torque Receiving Part; 213BO Outer Cylinder Part; 213BI Inner Cylinder Part;

[0070] 213C Torque Adjustment Unit; 213CK Main Body Unit; 213CK1 Locking Unit; 213CK2 Straight Rod Unit; 213CS Spring Unit. Detailed Implementation

[0071] The embodiments of the present disclosure will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the disclosure. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of the present disclosure for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts of the present disclosure.

[0072] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The terms “having”, “comprising”, etc., as used herein indicate the presence of the said features, operations, and / or components, but do not exclude the presence or addition of one or more other features, operations, or components.

[0073] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0074] When using expressions such as "at least one of A, B, and C," they should generally be interpreted in accordance with the meaning commonly understood by a person skilled in the art (e.g., "an apparatus having at least one of A, B, and C" should include, but is not limited to, having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.). A person skilled in the art should also understand that any conjunction and / or phrase that substantially arbitrarily represents two or more alternative items, whether in the specification, claims, or drawings, should be understood to give the possibility of including one of these items, either of these items, or both items. For example, the phrase "A or B" should be understood to include the possibility of "A" or "B," or "A and B."

[0075] In addition, for ease of understanding, the scale and aspect ratio of the actual objects in the attached drawings have been appropriately altered or exaggerated.

[0076] This disclosure provides a lens holding mechanism. The lens holding mechanism includes a base member and a lens shifting member. The lens shifting member supports a projection lens and is mounted on the base member in a manner capable of shifting along a first direction and a second direction. The first direction is orthogonal to the optical axis extension direction of the projection lens, and the second direction is orthogonal to both the optical axis extension direction and the first direction. The lens shifting member includes a first shifting member capable of moving the projection lens along the first direction. The first shifting member has a first holding portion and a first power transmission portion. The first holding portion holds the projection lens and has a first recess, and is mounted on the base member in a manner capable of shifting along the first direction. The first power transmission portion is formed integrally with the first holding portion and has a first protrusion that engages with the first recess. The first power transmission portion is mounted on the base member in a manner capable of shifting along the first direction. The first power transmission portion can drive the first holding portion to move along the first direction using the first protrusion. The first recess is formed as a generally cuboid-shaped first space, with one side of the first space open for the first protrusion to be inserted. The first protrusion is inserted into the first space, and its two opposing sides in the first direction are formed into arc shapes.

[0077] The following is for reference Figures 1 to 16 The lens holding mechanism of this disclosure will be described. It should be noted that the X-axis, Y-axis and Z-axis directions shown in the figures are indicated for ease of understanding and are not intended to limit this disclosure.

[0078] Figure 1 This is a perspective view showing the lens holding mechanism 1 of this disclosure. Figure 2 This is an exploded perspective view showing the lens holding mechanism 1 of this disclosure. Figure 1 as well as Figure 2 As shown, the lens holding mechanism 1 includes a base member 10 and a lens shifting member 20. The lens shifting member 20 supports the projection lens 8 (i.e., the lens barrel on which the projection lens is assembled) and is mounted on the base member 10 in a manner that allows it to shift along a first direction and a second direction. The first direction is orthogonal to the optical axis extension direction of the projection lens 8, and the second direction is orthogonal to both the optical axis extension direction and the first direction. Figure 1 , Figure 2 In the accompanying diagrams with directions indicated, the X-axis corresponds to the direction of the optical axis of the projection lens, the Y-axis corresponds to the second direction, and the Z-axis corresponds to the first direction. Furthermore, for ease of understanding, in the following description, "up-down direction" will be used to refer to the first direction (Z-axis direction), and "left-right direction" will be used to refer to the second direction (Y-axis direction). It should be noted that the terms "up-down direction" and "left-right direction" in the following description are used for ease of understanding and are not intended to limit this disclosure.

[0079] The lens shifting member 20 includes a first shifting member 21 capable of moving the projection lens 8 in the vertical direction. The lens shifting member 20 may also include a second shifting member 22 capable of moving the projection lens 8 in the horizontal direction.

[0080] The base component 10 is made of aluminum alloy, for example, and has a hole in the center for the projection lens 8 to pass through, and has pins, screw holes, etc. for mounting the first displacement component 21 and the second displacement component 22. The first displacement component 21 and the second displacement component 22 can be mounted on the base component 10 by means of elongated holes provided in themselves, external screws, washers, springs, etc.

[0081] In one scheme, such as Figure 2 As shown, the base component 10, the second displacement component 22, and the first displacement component 21 are stacked sequentially along the optical axis. A spring component 2S extending in the left-right direction connects the first displacement component 21 and the second displacement component 22. The spring component 2S increases the stability of the relative position between the first displacement component 21 and the second displacement component 22.

[0082] Figure 3 This is an exploded perspective view showing the first displacement member 21 of this disclosure. Figure 4 This is a front view showing the first displacement member 21 of this disclosure. Figure 3 and Figure 4 The illustrations of the washers, springs, some screws, and the power input unit (described later) are omitted.

[0083] like Figure 3 as well as Figure 4 As shown, the first shifting member 21 has a first holding portion 211 and a first power transmission portion 212. The first holding portion 211 holds the projection lens 8 and has a first recess 211A, and is mounted on the base member 10 in a manner that allows it to move in the vertical direction. The first power transmission portion 212 is formed as a separate structure from the first holding portion 211, and has a first protrusion 212BT that engages with the first recess 211A, and is mounted on the base member 10 in a manner that allows it to move in the vertical direction. Thus, the first power transmission portion 212 can drive the first holding portion 211 to move in the vertical direction using the first protrusion 212BT. Since the first holding portion 211 and the first power transmission portion 212 are separate structures, when subjected to a large impact force, the impact force applied to one can be weakened on the other.

[0084] Elongated guide holes running vertically are formed on the first retaining portion 211 and the first power transmission portion 212, respectively, and guide pins corresponding to these guide holes are provided on the base member 10. Thus, the guide holes can move vertically relative to the guide pins. In other words, both the first retaining portion 211 and the first power transmission portion 212 are mounted on the base member 10 via their respective guide holes and corresponding guide pins. Even if one is subjected to a large impact force and tilts slightly, the other will maintain a stable posture due to its relatively independent mounting on the base member 10. Furthermore, the first protrusion 212BT of the first power transmission portion 212 engages with the first recess 211A of the first retaining portion 211, so the first retaining portion 211 and the first power transmission portion 212 can move synchronously relative to the base member 10 in the vertical direction. That is, the synchronicity of movement in the vertical direction is not lost.

[0085] like Figure 3 as well as Figure 4As shown, the first power transmission unit 212 has a first screw portion 212A and a first seat portion 212B. The first power transmission unit 212 may also have a first protective plate portion 212C to reduce the impact of external impact forces on the first screw portion 212A and the first seat portion 212B. The first screw portion 212A extends in the vertical direction and has a first external thread portion 212AN formed on its outer periphery, and rotates about a first rotation center line C1. The first seat portion 212B has a first protrusion 212BT and a first internal thread portion 212BN that engages with the first external thread portion 212AN, and moves in the vertical direction driven by the rotation of the first screw portion 212A. Both the first external thread portion 212AN and the first internal thread portion 212BN are continuous in the vertical direction. Furthermore, the first seat portion 212B is formed in a block shape, and the length of the first internal thread portion 212BN in the vertical direction is not less than half the length of the first external thread portion 212AN in the vertical direction. Therefore, the contact range between the first internal thread portion 212BN and the first external thread portion 212AN is large, the strength of the contact portion is improved, and the bonding stability between the two is good, with good impact resistance.

[0086] Figure 5 and Figure 6 This is an exploded perspective view showing the first holding part 211 and the first seat part 212B of this disclosure.

[0087] like Figure 5 as well as Figure 6 As shown, the first recess 211A is formed into a generally rectangular space, with one side 211AB of which the first protrusion 212BT is inserted. The first protrusion 212BT is inserted into the first space, and its two opposing sides 212BS in the vertical direction are formed into arc shapes. Thus, the two opposing sides 212BS of the first protrusion 212BT in the vertical direction and the inner surface of the first recess 211A that contacts them can rotate within a small range relative to each other in the left-right direction. Therefore, even if the impact force from the outside cannot be completely eliminated by the first guard plate 212C and is further transmitted to the first retaining part 211 or the first power transmission part 212, the aforementioned relative rotation can prevent further transmission of the impact force between the first retaining part 211 and the first power transmission part 212. Furthermore, even if the first retaining part 211 or the first power transmission part 212 tilts due to the impact force, the aforementioned relative rotation can quickly restore the tilt.

[0088] In one scheme, one of the two faces 211AS of the first space perpendicular to the direction of optical axis extension is open. Figure 6In the diagram, the boundary line between surfaces 211AB and 211AS in the first recess 211A is shown as a dashed line. This ensures stable support of the first recess 211A for the first protrusion 212BT while increasing the range of relative rotation between the first protrusion 212BT and the first recess 211A.

[0089] Figure 7 This is a perspective view showing the first screw section 212A of this disclosure enlarged. Figure 8A This is a perspective view showing an enlarged example of the first housing 212B of this disclosure. Figure 8B This is a side view showing an example of the first seat 212B of this disclosure, enlarged. Figure 7 The first screw section 212A and Figure 8A and Figure 8B The first seat portion 212B has been described above and is shown enlarged here for easier observation. It should be noted that the first screw portion 212A also has a first gear 212AH at the top, which is used to mesh with the input gear 213H of the power input portion 213 described later.

[0090] Figure 8C This is a perspective view showing another example of the first seat portion 212B of this disclosure. In this design, the first internal thread portion 212BN is formed as a partially open shape surrounding a portion of the circumferential direction of the first external thread portion 212AN. In addition, Figure 8C The structure of the first seat 212B shown in the figure is similar to Figure 8A , Figure 8B The structure of the first seat 212B shown is the same. Because... Figure 8C The first internal thread portion 212BN shown is formed in a partially open shape. Therefore, while maintaining the contact length between the first internal thread portion 212BN and the first external thread portion 212AN in the vertical direction, the overall thickness of the first power transmission portion 212 in the optical axis extension direction can be reduced, which helps to reduce the overall size of the device. Furthermore, the wear condition of the first external thread portion 212AN can be directly observed without disengaging the screw portion 212A and the first seat portion 212B, thereby facilitating maintenance.

[0091] Figure 9 This is an exploded perspective view showing the second shifting member 22 of this disclosure. Figure 10 This is a rear view showing the second shifting member 22 of this disclosure.

[0092] like Figure 9 as well as Figure 10As shown, the second shifting member 22 includes a second holding portion 221, a second power transmission portion 222, and a connecting portion 223. The second holding portion 221 holds the projection lens 8 and is mounted on the base member 10 in a manner that allows it to move in the left-right direction. The second power transmission portion 222 is formed as a separate structure from the second holding portion 221 and is mounted on the base member 10 in a manner that allows it to move in the up-down direction. The connecting portion 223 connects the second holding portion 221 and the second power transmission portion 222. By moving the second power transmission portion 222 in the up-down direction, the connecting portion 223 swings about the optical axis extension direction, thereby enabling the second holding portion 221 to move in the left-right direction via the connecting portion 223. Since the second holding portion 221 and the second power transmission portion 222 are separate structures, when subjected to a large impact force, the impact force applied to one can be weakened on the other.

[0093] Guide holes are formed on the second holding part 221 and the second power transmission part 222 respectively, and on the base member 10 (see reference) Figure 2 The base member 10 is provided with guide pins corresponding to these guide holes. Thus, the guide holes can move relative to the guide pins. That is, the second retaining part 221 and the second power transmission part 222 are respectively installed on the base member 10 through their respective guide holes and corresponding guide pins. Even if one of them is subjected to a large impact force and tilts slightly, the other will maintain a stable posture because it is installed on the base member 10 relatively independently.

[0094] like Figure 9 as well as Figure 10 As shown, the second power transmission unit 222 has a second screw portion 222A and a second seat portion 222B. The second power transmission unit 222 may also have a second protective plate portion 222C to reduce the impact of external impact forces on the second screw portion 222A and the second seat portion 222B. The second screw portion 222A extends in the vertical direction and has a second external thread portion 222AN formed on its outer periphery, and rotates about a second rotation center line C2. The second seat portion 222B has a second internal thread portion 222BN that engages with the second external thread portion 222AN, and moves in the vertical direction driven by the rotation of the second screw portion 222A. Both the second external thread portion 222AN and the second internal thread portion 222BN are continuous in the vertical direction. Furthermore, the second seat portion 222B is formed in a block shape, and the length of the second internal thread portion 222BN in the vertical direction is not less than half the length of the second external thread portion 222AN in the vertical direction. Therefore, the contact range between the second internal thread portion 222BN and the second external thread portion 222AN is larger, the strength of the contact portion is improved, and the bonding stability between the two is good, with good impact resistance.

[0095] Although not illustrated, similar to the first seat portion 212B described above, the second internal thread portion 222BN of the second seat portion 222B can also be formed as a partially open shape surrounding a portion of the second external thread portion 222AN in the circumferential direction. This allows for a reduction in the overall thickness of the second power transmission portion 222 in the optical axis extension direction while maintaining the contact length between the second internal thread portion 222BN and the second external thread portion 222AN in the vertical direction, thus helping to reduce the overall size of the device. Furthermore, the wear condition of the second external thread portion 222AN can be directly observed without disengaging the second screw portion 222A from the second seat portion 222B, thereby facilitating maintenance.

[0096] like Figure 10 As shown, a first elongated hole along the vertical direction is provided on the second holding part 221, and a second elongated hole along the horizontal direction is provided on the second power transmission part 222. Further reference... Figures 11A to 11C It is understood that the connecting part 223 has a first connecting pin 223A, a second connecting pin 223B, and a pin hole 223O. The first connecting pin 223A of the connecting part 223 is disposed in the first elongated hole, and the first connecting pin 223A can move along the first elongated hole, so that the connecting part 223 is connected to the second retaining part 221 via the first connecting pin 223A. The second connecting pin 223B of the connecting part 223 is disposed in the second elongated hole, and the second connecting pin 223B can move along the second elongated hole, so that the connecting part 223 is connected to the second power transmission part 222 via the second connecting pin 223B. The support pin 11 provided on the base member 10 (see reference) Figure 2 The pin hole 223O of the connecting part 223 passes through the connecting part 223. Therefore, the connecting part 223 swings about the optical axis extension direction with the support pin 11 provided on the base member 10 as the center.

[0097] Figure 11A This is a perspective view showing an example of a connecting part of this disclosure. Figure 11B This is a front view showing an example of a connecting part of this disclosure. Figure 11CThis is a rear view showing an example of the connecting part of this disclosure. The viewing angles of each figure are different for a more detailed understanding. When the distance between the support pin 11 and the first connecting pin 223A (the distance between the axis of the support pin 11 and the axis of the first connecting pin 223A) is L1, and the distance between the support pin 11 and the second connecting pin 223B (the distance between the axis of the support pin 11 and the axis of the second connecting pin 223B) is L2, L1 < L2. Therefore, for the second shifting member 22 of this disclosure, the displacement of the second holding part 221 in the left-right direction caused by the displacement of the second power transmission part 222 in the vertical direction is small, that is, the displacement of the projection lens 8 in the left-right direction is small, enabling fine adjustment of the position of the projection lens 8. As a preferred embodiment, for example, 0.8 < L1 / L2 < 0.95, which balances the efficiency and precision of position adjustment.

[0098] Figure 12A This is a front view showing another example of the link 223 of this disclosure. Figure 12B This is a rear view showing another example of the connecting part 223 of this disclosure. (See image) Figure 12A and Figure 12B As shown, reinforcing ribs can be provided on the surface and back of the connecting part 223 as needed to improve the service life of the connecting part.

[0099] Refer again Figure 1 and Figure 2 It is understood that the first shifting member 21 also has a power input section installed on the first power transmission section and used for the operator to input torque to the first power transmission section, and restricts the input of torque to the first power transmission section when the input torque exceeds a predetermined threshold; the second shifting member 22 also has a power input section installed on the second power transmission section and used for the operator to input torque to the second power transmission section, and restricts the input of torque to the second power transmission section when the input torque exceeds a predetermined threshold.

[0100] Since the power input section of the first shift member 21 and the power input section of the second shift member 22 have the same structure, the following description will take the power input section 213 of the first shift member 21 as an example.

[0101] Figure 13A This is an exploded perspective view showing the power input section 213 of this disclosure. Figure 13B and Figure 13C This is an exploded perspective view of the power input section 213 of this disclosure, omitting the mounting plate 213D.

[0102] like Figures 13A to 13CAs shown, the power input unit 213 includes an operating part 213A and a torque receiving part 213B. The power input unit 213 may also include a mounting plate 213D sandwiched between the operating part 213A and the torque receiving part 213B, which is used to fix the power input unit 213. One end of the operating part 213A is formed as a knob 213AN for rotational operation by the operator, and the other end is formed as a cylindrical part 213AT. An internal spline 213AS is provided on the inner circumference of the cylindrical part 213AT, and a positioning shaft 213AX is provided at the center of the cylindrical part 213AT. The torque receiving part 213B is formed as a double-layered cylindrical part having an outer cylindrical part 213BO and an inner cylindrical part 213BI, with a space formed between the outer cylindrical part 213BO and the inner cylindrical part 213BI to accommodate the cylindrical part 213AT. The inner circumference of the outer cylindrical part 213BO slides in contact with the outer circumference of the cylindrical part 213AT. The outer cylinder portion 213BO is connected to the first power transmission portion 212 on the side opposite to the operating portion 213A. As an example, the outer cylinder portion 213BO may have an input gear 213H on the side opposite to the operating portion 213A for meshing with the first gear 212AH at the top of the aforementioned first screw portion 212A.

[0103] The inner cylinder 213BI houses a pair of torque adjusting parts 213C in a centrally symmetrical manner with respect to the positioning axis 213AX. Each torque adjusting part 213C has a main body 213CK and a spring 213CS. One end of the main body 213CK is formed as a locking part 213CK1 that passes through the cylinder wall of the inner cylinder 213BI, and the other end is formed as a straight rod 213CK2 that is spaced apart from the inner wall of the inner cylinder 213BI. The spring 213CS is sleeved on the straight rod 213CK2.

[0104] Figure 14A and Figure 14B This is a perspective view showing the operation section 213A of this disclosure. Figure 14C This is a bottom view showing the operating section 213A of this disclosure. Figure 15 This is a top view showing a pair of torque adjustment units 213C of this disclosure. Figure 14A and Figure 14B The operation unit 213A and Figure 15 The pair of torque adjustment units 213C in the middle have been described above, and are shown enlarged here for easier observation. Figure 15 The distance between the pair of torque adjustment units 213C has been increased.

[0105] Figure 16 This is a schematic diagram showing the change in the engagement state between the locking part 213CK1 in the torque adjustment unit 213C and the internal spline 213AS in the operation unit 213A of this disclosure.

[0106] When the operator twists the knob 213AN of the operating unit 213A with a small force, that is, when the input torque is below a specified threshold, such as Figure 16 As shown in (A), the spring portion 213CS is in a relatively relaxed first compression state, and the locking portion 213CK1 is engaged with a keyway of the internal spline 213AS, allowing torque to be smoothly transmitted to the first power transmission portion 212. Specifically, when the operator turns the knob portion 213AN, the cylindrical portion 213AT rotates around the positioning shaft 213AX, thereby transmitting torque via the internal spline 213AS provided on the inner circumference of the cylindrical portion 213AT to the locking portion 213CK1 that engages with the internal spline 213AS. Furthermore, the torque adjusting portion 213C, which includes the locking portion 213CK1, drives the torque receiving portion 213B, which houses the torque adjusting portion 213C, to rotate. Then, the input gear 213H located at the bottom of the torque receiving portion 213B drives the first gear 212AH at the top of the first screw portion 212A that meshes with it to rotate, ultimately inputting torque into the first power transmission portion 212.

[0107] When the operator twists the knob 213AN of the operating unit 213A with excessive force, that is, when the input torque exceeds the specified threshold, such as Figure 16 As shown in (B), the spring portion 213CS is in a more compressed second state, and the locking portion 213CK1 retracts and disengages from one of the keyways, sliding along the internal spline 213AS, thus failing to stably engage with any keyway of the internal spline 213AS. Consequently, torque cannot be stably transmitted to the locking portion 213CK1, which engages with a keyway of the internal spline 213AS, via the internal spline 213AS provided on the inner circumference of the cylindrical portion 213AT. In other words, when the input torque exceeds a predetermined threshold, the power input portion 213 restricts the input of torque to the first power transmission portion 212.

[0108] When the operator turns the knob 213AN of the operating unit 213A again with a smaller force, that is, when the input torque becomes below the specified threshold, such as Figure 16 As shown in (C), the spring portion 213CS returns to a more relaxed first compression state, and the locking portion 213CK1 re-locks into a keyway of the inner spline 213AS, so that the torque can be smoothly transmitted to the first power transmission portion 212.

[0109] It should be noted that when the operator does not turn the knob 213AN of the operating part 213A, the spring part 213CS becomes Figure 16 In the first compression state shown in (A) or (C), the locking part 213CK1 is locked in a keyway of the internal spline 213AS.

[0110] In addition, although not illustrated, the projection-type image display device disclosed herein includes the aforementioned lens holding mechanism and an optical system for emitting light toward the projection lens.

[0111] In summary, the lens holding mechanism of this disclosure and the projection-type image display device having the lens holding mechanism have at least good impact resistance, good stability of the connection between components, or fine adjustability.

[0112] Those skilled in the art will understand that the features described in the various embodiments and / or claims of this disclosure can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in this disclosure. In particular, the features described in the various embodiments and / or claims of this disclosure can be combined or combined in various ways without departing from the spirit and teachings of this disclosure. All such combinations and / or combinations fall within the scope of this disclosure.

[0113] The embodiments of this disclosure have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of this disclosure. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of this disclosure is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of this disclosure, and all such substitutions and modifications should fall within the scope of this disclosure.

Claims

1. A lens holding mechanism, comprising: Base components; as well as A lens shifting member supports a projection lens and is mounted on the base member in a manner capable of shifting along a first direction and a second direction, wherein the first direction is orthogonal to the optical axis extension direction of the projection lens, and the second direction is orthogonal to both the optical axis extension direction and the first direction. The lens holding mechanism is characterized in that... The lens shifting component includes a first shifting component capable of moving the projection lens along the first direction. The first shifting member has: A first retaining portion holds the projection lens and has a first recess, and is mounted on the base member in a manner that allows it to move along the first direction; as well as The first power transmission part is formed integrally with the first holding part and has a first protrusion that engages with the first recess, and is mounted on the base member in a manner that allows it to move along the first direction. The first power transmission unit can use the first protrusion to drive the first holding unit to move along the first direction. The first recess is formed as a generally cuboid-shaped space, with one side of the first space open for the insertion of the first protrusion. The first protrusion is embedded in the first space, and the two opposing sides in the first direction are formed into an arc shape.

2. The lens holding mechanism according to claim 1, characterized in that, One of the two sides of the first space that is perpendicular to the direction of the optical axis is open.

3. The lens holding mechanism according to claim 1 or 2, characterized in that, The lens shifting component further includes a second shifting component capable of moving the projection lens along the second direction. The second shifting member has: The second holding part holds the projection lens and is mounted on the base member in a manner that allows it to move along the second direction; The second power transmission part is formed as integral with the second holding part and is mounted on the base member in a manner that allows it to move along the first direction; as well as The connecting part connects the second retaining part to the second power transmission part. The second power transmission unit moves along the first direction, causing the connecting part to swing about the optical axis extension direction, thereby enabling the second holding part to move along the second direction via the connecting part.

4. The lens holding mechanism according to claim 3, characterized in that, The connecting part swings about the optical axis around the support pin provided on the base member, is connected to the second holding part through the first connecting pin, and is connected to the second power transmission part through the second connecting pin. If the distance between the support pin and the first connecting pin is L1 and the distance between the support pin and the second connecting pin is L2, then L1 < L2.

5. The lens holding mechanism according to claim 4, characterized in that, 0.8 < L1 / L2 < 0.

95.

6. The lens holding mechanism according to claim 1 or 2, characterized in that, The first power transmission unit has: A first screw portion, extending along the first direction, having a first external thread formed on its outer periphery, and rotating about a first rotation center line; and The first seat portion, having the first protrusion and a first internal thread portion that engages with the first external thread portion, is moved along the first direction by the rotation of the first screw portion. The first internal thread portion is formed as a partially open shape that surrounds a portion of the first external thread portion in the circumferential direction.

7. The lens holding mechanism according to claim 3, characterized in that, The second power transmission unit has: The second screw portion extends along the first direction, has a second external thread formed on its outer periphery, and rotates about the second rotation center line; and The second seat portion has a second internal thread portion that engages with the second external thread portion, and is driven by the rotation of the second screw portion to move along the first direction. The second internal thread portion is formed as a partially open shape that surrounds a portion of the second external thread portion in the circumferential direction.

8. The lens holding mechanism according to claim 3, characterized in that, The base component, the second displacement component, and the first displacement component are stacked sequentially along the optical axis, and a spring component extending along the second direction is connected between the first displacement component and the second displacement component.

9. The lens holding mechanism according to claim 1 or 2, characterized in that, The first displacement member also has a power input section mounted on the first power transmission section and used for the operator to input torque to the first power transmission section. If the input torque exceeds a predetermined threshold, the input torque to the first power transmission unit is restricted.

10. The lens holding mechanism according to claim 3, characterized in that, The second displacement member also has a power input section mounted on the second power transmission section for allowing the operator to input torque to the second power transmission section. If the input torque exceeds a specified threshold, the input torque to the second power transmission unit is restricted.

11. The lens holding mechanism according to claim 9, characterized in that, The power input section has: The operating part has a knob at one end for rotation by the operator and a cylindrical part at the other end. An internal spline is provided on the inner circumference of the cylindrical part, and a positioning shaft is provided at the center of the cylindrical part. The torque-bearing portion is formed as a double-layered cylindrical portion having an outer cylindrical portion and an inner cylindrical portion, with a space formed between the outer cylindrical portion and the inner cylindrical portion to accommodate the cylindrical portion. The inner circumference of the outer cylindrical portion slides in contact with the outer circumference of the cylindrical portion. The inner cylinder houses a pair of torque adjustment parts in a centrally symmetrical manner relative to the positioning axis. Each of the torque adjusting units has: The main body has one end formed as a locking portion passing through the wall of the inner cylinder, and the other end formed as a straight rod portion spaced apart from the inner wall of the inner cylinder; and The spring portion is sleeved on the straight rod portion and can be in a first compressed state or a second compressed state. When the input torque is below the specified threshold, the spring portion is in the first compressed state, and the locking portion is engaged with a keyway of the internal spline. When the input torque exceeds the specified threshold, the spring portion is in the second compressed state, and the locking portion disengages from the keyway. The outer cylinder is connected to the first power transmission part on the side opposite to the operating part.

12. The lens holding mechanism according to claim 10, characterized in that, The power input section has: The operating part has a knob at one end for rotation by the operator and a cylindrical part at the other end. An internal spline is provided on the inner circumference of the cylindrical part, and a positioning shaft is provided at the center of the cylindrical part. The torque-bearing portion is formed as a double-layered cylindrical portion having an outer cylindrical portion and an inner cylindrical portion, with a space formed between the outer cylindrical portion and the inner cylindrical portion to accommodate the cylindrical portion. The inner circumference of the outer cylindrical portion slides in contact with the outer circumference of the cylindrical portion. The inner cylinder houses a pair of torque adjustment parts in a centrally symmetrical manner relative to the positioning axis. Each of the torque adjusting units has: The main body has one end formed as a locking portion passing through the wall of the inner cylinder, and the other end formed as a straight rod portion spaced apart from the inner wall of the inner cylinder; and The spring portion is sleeved on the straight rod portion and can be in a first compressed state or a second compressed state. When the input torque is below the specified threshold, the spring portion is in the first compressed state, and the locking portion is engaged with a keyway of the internal spline. When the input torque exceeds the specified threshold, the spring portion is in the second compressed state, and the locking portion disengages from the keyway. The outer cylinder is connected to the second power transmission unit on the side opposite to the operating unit.

13. A projection-type image display device, characterized in that, have: The lens holding mechanism according to any one of claims 1 to 12; and An optical system that emits light toward the projection lens.

Images