JPS6141345Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention automatically moves a reflecting mirror for projecting light emitted from a cathode ray tube onto a screen from the front side of a housing-like chassis that constitutes the main body of the device. This invention relates to an image projection device that can be moved back.

Although video projection devices have been developed in the past that project images from television equipment onto a screen and project the images in a larger size, they still cannot be used to project images from the front of the chassis that houses the cathode ray tube, projection lens, etc. However, no image projection device has been developed in which a reflecting mirror is projected forward by remote control or the like. However, it is not possible to assemble the reflecting mirror integrally with it protruding from the front surface of the chassis because this increases the size of the entire device. In addition, the reflective mirror can be manually pulled out from the front of the chassis when necessary.
The work becomes complicated and cannot be done. Therefore, it is desired to develop an image projection device in which a reflecting mirror can be projected forward from the front of the chassis by remote control only when in use to a position that satisfies the projection optical system from the cathode ray tube to the screen. Ta.

The present invention was proposed in response to such demands.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of a video projection device to which the present invention is applied.

As shown in FIG. 1, a housing-like chassis 1
Inside, a plurality of projection lenses 2, 2... and corresponding cathode ray tubes 3, 3... are arranged, and a reflection mirror 5 is attached to the front part 4 thereof.

Also, inside the chassis 1, there is one drive motor 6 as a drive source, and a pair of first and second drive parts 7 and 8 driven by this drive motor 6.
The driving parts 7, 8 are arranged parallel to each other between the driving parts 7, 8 and the reflecting mirror 5.
A pair of telescoping mechanisms 9 and 10 which are telescopically driven by the driving force of 8 are disposed between the rear end portions 3a, 3a of the cathode ray tubes 3, 3... and the rear end portion of the chassis 1a. A connecting shaft 11 that connects each of the driving parts 7 and 8 is provided. The pair of expansion and contraction mechanisms 7 and 8 are synchronously driven to expand and contract by the connection shaft 11 driven by each of the drive units 7 and 8.

The rotational drive shaft 12 of the drive motor 6 is connected to a worm gear 1 rotatably disposed within an outer casing 13 that covers the drive section 7, as shown in FIGS. 2 and 3.
4, and this worm gear 14 meshes with a worm wheel 15. A disk-shaped clutch plate 16 is provided coaxially with the wheel 15. The clutch plate 16 is fixed to a drive shaft 17, and the drive shaft 17 is rotatably supported within the outer casing 13. Incidentally, an overload prevention mechanism 18 is provided between the clutch plate 16 and the worm wheel 15 to prevent an overload condition when a load exceeding a predetermined value is applied to the worm wheel 15. In this embodiment, during normal driving, the contact plates 18a and 18b provided on both the clutch plate 16 and the worm wheel 15 are in contact with each other, but when a load exceeding a predetermined value is applied to the worm wheel 15, Each contact plate 18a, 18b is separated, thereby turning off the power to the drive motor 6.

A small gear 19 is integrally attached to the drive shaft 17, and a gear portion 19 of this small gear 19
a meshes with the gear portion 20a of the large gear 20. The large gear 20 is rotatably supported by a shaft 21 fixed to the outer casing 13.

On the other hand, the first
A second drive unit 8 driven by the drive motor 6 is located on the opposite side of the chassis 1 from the drive unit 7.
is fixed to chassis 1. This second drive section 8 is comprised of the first drive section except for a portion where a worm gear 14, a worm wheel 15, an overload prevention mechanism 18, and a clutch plate 16 which are rotationally driven by a drive motor 6 are not provided. The structure is almost the same as that of 7. That is, the second drive section 8
A small gear 24 is integrally attached to a drive shaft 23 that is rotatably supported in an outer casing 22 that covers the It meshes with the gear portion 25a. The large gear 25 is rotatably supported by a shaft 26 fixed to the outer casing 22.

The first and second driving sections 7 and 8 and the reflecting mirror 5
In this embodiment, a pair of telescopic mechanisms 9 and 10 arranged parallel to each other are connected to first, second, and third telescopic pipes 27, 28, and 2 of large, medium, and small cylindrical shapes.
9 is inserted into these telescopic pipes 27, 28, 29, more precisely, into the second and third telescopic pipes 28, 29, and is rotated by the rotational drive of the large gear 20 of each drive section 7, 8. 2.Third telescopic pipe 2
8 and 29.

The tip of the third telescopic pipe 29 is attached to a reflector cover 5a that covers the reflecting mirror 5 via a hinge mechanism that will be described later. Inside the cylindrical portion 29a at the base end, as shown in FIG.
is integrally fixed to. A connecting member 32 for integrally connecting the tip 30a of the drive belt 30 and the third telescopic pipe 29 is provided within the bush 31.

Next, in the cylindrical part 28a formed at the tip of the second telescopic pipe 28 whose diameter ₂ is slightly larger than the diameter ₁ of the third telescopic pipe 29, there is a middle part of the third telescopic pipe 29. An annular stopper member 34 that is pressed in the direction of the arrow X in FIG.
is integrally fixed to this second telescopic pipe 28. Inside the cylindrical portion 28b formed at the base end of the second telescopic pipe 28, a disk-shaped bushing 36 having an insertion hole 35 through which the drive belt 30 is inserted is integrally fixed.

Next, a cylindrical portion 27a formed at the tip of the first telescoping pipe 27 whose diameter ₃ is slightly larger than the diameter ₂ of the second telescoping pipe 28 has an outer periphery in the middle of the second telescoping pipe 28. An annular stopper member 38 is integrally fixed to the first telescopic pipe 27 and is pressed in the direction of the arrow X in FIG. A cylindrical part 40 having an outlet 39 through which the drive belt 30 of the first drive part 7 is let out is fitted into the cylindrical part 27b formed at the base end of the first telescoping pipe 27. Set screw 41
It is integrally fixed by etc. Note that a guide member 42 for guiding the drive belt 30 is provided inside the outlet 39.

The drive belt 30 is connected to the telescopic pipe 27,
28 and 29 to a desired position, and into which the gear portion 20a of the large gear 20 is inserted along its longitudinal direction.
b... are formed at intervals corresponding to the gear portion 20a. This drive belt 30 is driven to run along a belt running path 43 formed in an arc shape on a part of the outer periphery of the large gear 20, and the other end 30c
is the vertical part 44 of the chassis 1 as shown in FIG.
It is configured to be pushed and moved through a guide plate 45 provided in the chassis 1 until it reaches the vicinity of the upper end of the chassis 1.

Note that a telescopic mechanism 10 having the same structure as the telescopic mechanism 9 is provided between the second driving section 8 and the reflecting mirror 5.

Next, as shown in FIG. 3, cylindrical sleeves 46 and 47 are integrally attached to both ends 11a and 11b of the connecting shaft 11 for connecting the pair of drive parts 7 and 8, and one One end 11a of the connecting shaft 11 is inserted into the through hole 46a of the sleeve 46 and fixed thereto with a set screw 48, etc., and inside the through hole 47a of the other sleeve 47,
The other end 11b of the connecting shaft 11 is inserted, and a nut 49 is used to tighten and secure them.

Next, the operation of the present invention will be explained.

First, a description will be given of the operation of projecting the reflecting mirror 5 forward from the front surface 4 of the chassis 1 as shown in FIG.

First, one drive motor 6 is driven, for example, by remote control. Then, the rotational driving force of the drive motor 6 is transmitted to its rotational driving shaft 12, this driving shaft 12
a worm gear 14 that rotates in unison with the worm gear 14, a worm wheel 15 that meshes with the worm gear 14, an overload prevention mechanism 18, and a clutch plate 1.
6. The small gear 1 meshing with the recesses 16a, 16a... formed on one side of the clutch plate 16.
9. Large gear 20 meshing with this small gear 19
is sequentially transmitted to rotate this large gear 20 at a predetermined speed. When the large gear 20 rotates, the drive belt 30 meshing with the gear part 20a of the large gear 20 is let out from the outlet 39 of the first drive part 7.

On the other hand, the rotational driving force transmitted from the drive motor 6 to the small gear 19 is transmitted to the second drive unit 8 via the drive shaft 17 to which the small gear 19 is fixed, the sleeve 46, the connecting shaft 11, and the sleeve 47, respectively. This rotational driving force is further transmitted to a small gear 24 that is integrally attached to this drive shaft 23 and a large gear 25 that meshes with this small gear 24. The gear 25 is rotated at the same speed in synchronization with the large gear 20 in the first drive section 7 described above. Therefore, the other drive belt 30 meshing with the gear portion 25a of this large gear 25 is
It is fed out from a feeding port (not shown) of the second drive unit 8 in synchronization with the drive belt 30.

When the pair of drive belts 30, 30 are synchronously let out from each outlet 39, the leading end 3
The third telescopic pipe 29 fixed to 0a, 30a via the connecting member 32 etc. is connected to the second telescopic pipe 28.
is pushed out along its circumferential surface toward its tip. When the third telescopic pipe 29 is pushed out, the push-out ring 33 surrounding the outer circumference of this pipe 29 moves to the fourth
As shown in the figure, the stopper member 34 fixed to the tip of the second telescoping pipe 28 is pressed, and the second telescoping pipe 28 is pressed.
8 is pushed out along the inner peripheral surface of the first telescoping pipe 27 toward its tip. When the second telescopic pipe 28 is pushed out, the extrusion ring 37 surrounding the outer circumference of the pipe 28 comes into contact with the stopper member 38 fixed to the tip of the first telescopic pipe 27.
This second telescopic pipe 28 is pushed out along the inner peripheral surface of the first telescopic pipe 27. Therefore,
A reflector cover 5a having a reflection mirror 5 housed in an opening 4a formed in the front part 4 of the chassis 1 so as to cover the front surface of each of the projection lenses 2, 2, . , 10, as shown in FIG. During this movement, the reflecting mirror 5 is moved from the cathode ray tubes 3, 3 . , 2... to a position that satisfies the projection optical system for projecting the light onto the screen 51, and the stoppers provided near the hinge mechanisms 50, 50 The mounting position is fixed. Therefore, the reflecting mirror 5 is fixed at a position that satisfies the above projection optical system.

Next, the operation of moving the reflecting mirror 5 from the state shown in FIG. 1 to the stored state shown by the dashed line in the figure will be described.

First, the drive motor 6 is driven in the reverse direction, contrary to the above operation. Then, the rotational driving force of the drive motor 6 is applied to the rotational drive shaft 12, the worm gear 14 that rotates integrally with the drive shaft 12, and the worm wheel 1 that meshes with the worm gear 14.
5. Overload prevention mechanism 18, clutch plate 16, recess 16a formed on one side of clutch plate 16,
The signal is sequentially transmitted to the small gear 19 meshing with the small gear 16a, and the large gear 20 meshing with the small gear 19, and the large gear 20 rotates at a predetermined speed. When the large gear 20 rotates, the drive belt 30 meshing with the gear portion 20a of the large gear 20 rotates.
Through the outlet 39 of the first drive unit 7, the outlet 52
Furthermore, it attempts to move toward the upper end of the chassis 1 through the inside of the guide plate 45.

On the other hand, the rotational driving force transmitted from the drive motor 6 to the small gear 19 is transmitted to the second drive unit 8 via the drive shaft 17 to which the small gear 19 is fixed, the sleeve 46, the connecting shaft 11, and the sleeve 47, respectively. This rotational driving force is further transmitted to a small gear 24 that is integrally attached to this drive shaft 23 and a large gear 25 that meshes with this small gear 24. The gear 25 rotates at the same speed in synchronization with the large gear 20 in the first drive section 7 described above. Therefore, this large gear 25
Another drive belt 30 meshing with the gear portion 25a is pulled out from the discharge port (not shown) of the second drive portion 8 in synchronization with the drive belt 30.

When the pair of drive belts 30, 30 are pulled out from each discharge port 52 . It is pushed into the proximal end along the circumferential surface. When the third telescoping pipe 29 is pushed out, the upper end 53a of the bushing 53 fixed to the base end of the second telescoping pipe 28 is pressed by the lower end surface 31a of the bushing 31 ringed around the inner periphery of the base end of the pipe 29. As a result, the second telescopic pipe 28 is pushed toward the base end along the inner circumferential surface of the first telescopic pipe 29, and the respective drive parts 7, 8
It stops at a position near the outlet 39. Thus, the reflector cover 5 with the reflective mirror 5
a is caused by the pair of telescopic mechanisms 9 and 10,
The front part 4 of the chassis 1 as shown by the dashed line in the figure.
It will be housed in the opening 4a formed in the.

When the reflector cover 5a is stored in the opening 4a, the lower edge of the cover 5a comes into contact with the bottom plate 1b of the chassis 1, so that the upper edge opposite to the lower edge It rotates toward the chassis 1 with the hinge mechanisms 50, 50 as the rotation center. Therefore, the reflector cover 5a
is housed in the opening 4a so as to cover the front surface of each reflective lens 2, 2....

In the above, the reflecting mirror 5 is automatically moved forward from the front part 4 of the chassis 1 by the driving force of the drive motor 6.
5 and 6 for the case where the same operation as described above is performed by manual operation.
This will be explained below with reference to the figures.

First, the pivot 54 is attached to the outer casing 13 of the first drive unit 7.
The operating lever 55, which is rotatably attached via the handle, is rotated clockwise in FIG. Then,
One end 57a of the pressing rod 57 is attached to the operating lever 55 via a pivot 56, and the other end 57b of the pressing rod 57 projects leftward in the figure from within the insertion hole 58 formed in the outer casing 13. Therefore, the other end 57 of this pressing rod 57
Both the manual plate 59 to which b is fixed and the aforementioned small gear 19 to which the manual plate 59 is fitted move along the longitudinal direction of the drive shaft 17.
For this reason, the convex portion 1 formed on the outer periphery of the pinion 19
9a is removed from a recess 16a formed on one side of the clutch plate 16. Therefore, the small gear 19 and the clutch plate 16 are separated, and therefore, by rotating the manual plate 59 in a predetermined direction, the drive shaft 1
7. Since the small gear 19 and the large gear 16 can be rotated, the reflecting mirror 5 can be manually operated in a predetermined direction via the pair of telescoping mechanisms 9 and 10.

As is clear from the above description, the present invention is an image projection device in which a projection lens and a cathode ray tube are arranged in a housing-like chassis, and a reflection mirror is attached to the front part of the image projection device. a pair of first and second drive units driven by;
A pair of telescoping mechanisms are disposed parallel to each other between each of these driving parts and the reflecting mirror and are driven to extend and contract by the driving force of each of the driving parts, and a rear end of the cathode ray tube and a rear end of the chassis are provided. and a connecting shaft that connects each of the driving parts such that the pair of telescopic mechanisms are synchronously extended and contracted by the connecting shaft that is driven by the driving force of each of the driving parts. Therefore, the reflecting mirror can be automatically projected to a predetermined position with an extremely simple structure, or can be stored in the chassis, making it easy to achieve the desired purpose. can do.

Furthermore, since the pair of expansion and contraction mechanisms are driven to expand and contract in synchronization, the reflection mirror can be moved while maintaining a correct posture that satisfies the imaging optical system.

Furthermore, since the connecting shaft is placed between the rear end of the cathode ray tube and the rear end of the chassis, there is no need to create a special space for its arrangement.
This can contribute to miniaturization of the entire device.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the image projection device according to the present invention, FIG. 2 is a partially cutaway side view showing an enlarged view of the belt drive section and the area around the telescoping mechanism, and FIG. 3 is a partially cutaway side view showing each drive section. A partially omitted cross-sectional view showing the state of connection between the and the connecting shaft, Figure 4 is a cross-sectional view of the main part showing the third telescopic pipe in the middle of its extension, and Figure 5 is the state before the operation lever is rotated. FIG. 6 is a vertical cross-sectional view of the drive unit showing the state after the operating lever has been rotated. 1... Chassis, 2, 2... Projection lens, 3,
3... Braun tube, 4... Front part, 5... Reflection mirror, 6... Drive source, 7, 8... First and second drive sections, 9, 10... Pair of expansion and contraction mechanisms, 11... Connection shaft, 30...drive belt, 51...screen.

Claims (1)

[Scope of utility model registration request] In an image projection device in which a projection lens and a cathode ray tube are arranged in a case-like chassis and a reflection mirror is attached to the front part of the projection device, there is one drive source and a pair of first and second lights driven by this drive source. each drive section, a pair of telescoping mechanisms disposed parallel to each other between each drive section and the reflecting mirror and driven to extend and contract by the driving force of each of the drive sections; The pair of telescopic mechanisms are synchronized by the connecting shaft, which is driven by the driving force of each of the driving parts. An image projection device characterized in that the image projection device is driven to expand and contract.